diff options
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 7440 |
1 files changed, 7440 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c new file mode 100644 index 0000000000..d062383ea5 --- /dev/null +++ b/fs/ext4/super.c @@ -0,0 +1,7440 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/ext4/super.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/inode.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/fs.h> +#include <linux/time.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/backing-dev.h> +#include <linux/parser.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/vfs.h> +#include <linux/random.h> +#include <linux/mount.h> +#include <linux/namei.h> +#include <linux/quotaops.h> +#include <linux/seq_file.h> +#include <linux/ctype.h> +#include <linux/log2.h> +#include <linux/crc16.h> +#include <linux/dax.h> +#include <linux/uaccess.h> +#include <linux/iversion.h> +#include <linux/unicode.h> +#include <linux/part_stat.h> +#include <linux/kthread.h> +#include <linux/freezer.h> +#include <linux/fsnotify.h> +#include <linux/fs_context.h> +#include <linux/fs_parser.h> + +#include "ext4.h" +#include "ext4_extents.h" /* Needed for trace points definition */ +#include "ext4_jbd2.h" +#include "xattr.h" +#include "acl.h" +#include "mballoc.h" +#include "fsmap.h" + +#define CREATE_TRACE_POINTS +#include <trace/events/ext4.h> + +static struct ext4_lazy_init *ext4_li_info; +static DEFINE_MUTEX(ext4_li_mtx); +static struct ratelimit_state ext4_mount_msg_ratelimit; + +static int ext4_load_journal(struct super_block *, struct ext4_super_block *, + unsigned long journal_devnum); +static int ext4_show_options(struct seq_file *seq, struct dentry *root); +static void ext4_update_super(struct super_block *sb); +static int ext4_commit_super(struct super_block *sb); +static int ext4_mark_recovery_complete(struct super_block *sb, + struct ext4_super_block *es); +static int ext4_clear_journal_err(struct super_block *sb, + struct ext4_super_block *es); +static int ext4_sync_fs(struct super_block *sb, int wait); +static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); +static int ext4_unfreeze(struct super_block *sb); +static int ext4_freeze(struct super_block *sb); +static inline int ext2_feature_set_ok(struct super_block *sb); +static inline int ext3_feature_set_ok(struct super_block *sb); +static void ext4_destroy_lazyinit_thread(void); +static void ext4_unregister_li_request(struct super_block *sb); +static void ext4_clear_request_list(void); +static struct inode *ext4_get_journal_inode(struct super_block *sb, + unsigned int journal_inum); +static int ext4_validate_options(struct fs_context *fc); +static int ext4_check_opt_consistency(struct fs_context *fc, + struct super_block *sb); +static void ext4_apply_options(struct fs_context *fc, struct super_block *sb); +static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param); +static int ext4_get_tree(struct fs_context *fc); +static int ext4_reconfigure(struct fs_context *fc); +static void ext4_fc_free(struct fs_context *fc); +static int ext4_init_fs_context(struct fs_context *fc); +static void ext4_kill_sb(struct super_block *sb); +static const struct fs_parameter_spec ext4_param_specs[]; + +/* + * Lock ordering + * + * page fault path: + * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start + * -> page lock -> i_data_sem (rw) + * + * buffered write path: + * sb_start_write -> i_mutex -> mmap_lock + * sb_start_write -> i_mutex -> transaction start -> page lock -> + * i_data_sem (rw) + * + * truncate: + * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) -> + * page lock + * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start -> + * i_data_sem (rw) + * + * direct IO: + * sb_start_write -> i_mutex -> mmap_lock + * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw) + * + * writepages: + * transaction start -> page lock(s) -> i_data_sem (rw) + */ + +static const struct fs_context_operations ext4_context_ops = { + .parse_param = ext4_parse_param, + .get_tree = ext4_get_tree, + .reconfigure = ext4_reconfigure, + .free = ext4_fc_free, +}; + + +#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) +static struct file_system_type ext2_fs_type = { + .owner = THIS_MODULE, + .name = "ext2", + .init_fs_context = ext4_init_fs_context, + .parameters = ext4_param_specs, + .kill_sb = ext4_kill_sb, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext2"); +MODULE_ALIAS("ext2"); +#define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type) +#else +#define IS_EXT2_SB(sb) (0) +#endif + + +static struct file_system_type ext3_fs_type = { + .owner = THIS_MODULE, + .name = "ext3", + .init_fs_context = ext4_init_fs_context, + .parameters = ext4_param_specs, + .kill_sb = ext4_kill_sb, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext3"); +MODULE_ALIAS("ext3"); +#define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type) + + +static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, + bh_end_io_t *end_io) +{ + /* + * buffer's verified bit is no longer valid after reading from + * disk again due to write out error, clear it to make sure we + * recheck the buffer contents. + */ + clear_buffer_verified(bh); + + bh->b_end_io = end_io ? end_io : end_buffer_read_sync; + get_bh(bh); + submit_bh(REQ_OP_READ | op_flags, bh); +} + +void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, + bh_end_io_t *end_io) +{ + BUG_ON(!buffer_locked(bh)); + + if (ext4_buffer_uptodate(bh)) { + unlock_buffer(bh); + return; + } + __ext4_read_bh(bh, op_flags, end_io); +} + +int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io) +{ + BUG_ON(!buffer_locked(bh)); + + if (ext4_buffer_uptodate(bh)) { + unlock_buffer(bh); + return 0; + } + + __ext4_read_bh(bh, op_flags, end_io); + + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + return 0; + return -EIO; +} + +int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait) +{ + lock_buffer(bh); + if (!wait) { + ext4_read_bh_nowait(bh, op_flags, NULL); + return 0; + } + return ext4_read_bh(bh, op_flags, NULL); +} + +/* + * This works like __bread_gfp() except it uses ERR_PTR for error + * returns. Currently with sb_bread it's impossible to distinguish + * between ENOMEM and EIO situations (since both result in a NULL + * return. + */ +static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb, + sector_t block, + blk_opf_t op_flags, gfp_t gfp) +{ + struct buffer_head *bh; + int ret; + + bh = sb_getblk_gfp(sb, block, gfp); + if (bh == NULL) + return ERR_PTR(-ENOMEM); + if (ext4_buffer_uptodate(bh)) + return bh; + + ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true); + if (ret) { + put_bh(bh); + return ERR_PTR(ret); + } + return bh; +} + +struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block, + blk_opf_t op_flags) +{ + return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE); +} + +struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, + sector_t block) +{ + return __ext4_sb_bread_gfp(sb, block, 0, 0); +} + +void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block) +{ + struct buffer_head *bh = sb_getblk_gfp(sb, block, 0); + + if (likely(bh)) { + if (trylock_buffer(bh)) + ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL); + brelse(bh); + } +} + +static int ext4_verify_csum_type(struct super_block *sb, + struct ext4_super_block *es) +{ + if (!ext4_has_feature_metadata_csum(sb)) + return 1; + + return es->s_checksum_type == EXT4_CRC32C_CHKSUM; +} + +__le32 ext4_superblock_csum(struct super_block *sb, + struct ext4_super_block *es) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + int offset = offsetof(struct ext4_super_block, s_checksum); + __u32 csum; + + csum = ext4_chksum(sbi, ~0, (char *)es, offset); + + return cpu_to_le32(csum); +} + +static int ext4_superblock_csum_verify(struct super_block *sb, + struct ext4_super_block *es) +{ + if (!ext4_has_metadata_csum(sb)) + return 1; + + return es->s_checksum == ext4_superblock_csum(sb, es); +} + +void ext4_superblock_csum_set(struct super_block *sb) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + if (!ext4_has_metadata_csum(sb)) + return; + + es->s_checksum = ext4_superblock_csum(sb, es); +} + +ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_block_bitmap_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); +} + +ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_inode_bitmap_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); +} + +ext4_fsblk_t ext4_inode_table(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_inode_table_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); +} + +__u32 ext4_free_group_clusters(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_free_blocks_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); +} + +__u32 ext4_free_inodes_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_free_inodes_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); +} + +__u32 ext4_used_dirs_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_used_dirs_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); +} + +__u32 ext4_itable_unused_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_itable_unused_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); +} + +void ext4_block_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); +} + +void ext4_inode_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); +} + +void ext4_inode_table_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_inode_table_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); +} + +void ext4_free_group_clusters_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_free_inodes_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_used_dirs_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_itable_unused_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); +} + +static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now) +{ + now = clamp_val(now, 0, (1ull << 40) - 1); + + *lo = cpu_to_le32(lower_32_bits(now)); + *hi = upper_32_bits(now); +} + +static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi) +{ + return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo); +} +#define ext4_update_tstamp(es, tstamp) \ + __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \ + ktime_get_real_seconds()) +#define ext4_get_tstamp(es, tstamp) \ + __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi) + +#define EXT4_SB_REFRESH_INTERVAL_SEC (3600) /* seconds (1 hour) */ +#define EXT4_SB_REFRESH_INTERVAL_KB (16384) /* kilobytes (16MB) */ + +/* + * The ext4_maybe_update_superblock() function checks and updates the + * superblock if needed. + * + * This function is designed to update the on-disk superblock only under + * certain conditions to prevent excessive disk writes and unnecessary + * waking of the disk from sleep. The superblock will be updated if: + * 1. More than an hour has passed since the last superblock update, and + * 2. More than 16MB have been written since the last superblock update. + * + * @sb: The superblock + */ +static void ext4_maybe_update_superblock(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + journal_t *journal = sbi->s_journal; + time64_t now; + __u64 last_update; + __u64 lifetime_write_kbytes; + __u64 diff_size; + + if (sb_rdonly(sb) || !(sb->s_flags & SB_ACTIVE) || + !journal || (journal->j_flags & JBD2_UNMOUNT)) + return; + + now = ktime_get_real_seconds(); + last_update = ext4_get_tstamp(es, s_wtime); + + if (likely(now - last_update < EXT4_SB_REFRESH_INTERVAL_SEC)) + return; + + lifetime_write_kbytes = sbi->s_kbytes_written + + ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - + sbi->s_sectors_written_start) >> 1); + + /* Get the number of kilobytes not written to disk to account + * for statistics and compare with a multiple of 16 MB. This + * is used to determine when the next superblock commit should + * occur (i.e. not more often than once per 16MB if there was + * less written in an hour). + */ + diff_size = lifetime_write_kbytes - le64_to_cpu(es->s_kbytes_written); + + if (diff_size > EXT4_SB_REFRESH_INTERVAL_KB) + schedule_work(&EXT4_SB(sb)->s_sb_upd_work); +} + +/* + * The del_gendisk() function uninitializes the disk-specific data + * structures, including the bdi structure, without telling anyone + * else. Once this happens, any attempt to call mark_buffer_dirty() + * (for example, by ext4_commit_super), will cause a kernel OOPS. + * This is a kludge to prevent these oops until we can put in a proper + * hook in del_gendisk() to inform the VFS and file system layers. + */ +static int block_device_ejected(struct super_block *sb) +{ + struct inode *bd_inode = sb->s_bdev->bd_inode; + struct backing_dev_info *bdi = inode_to_bdi(bd_inode); + + return bdi->dev == NULL; +} + +static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) +{ + struct super_block *sb = journal->j_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + int error = is_journal_aborted(journal); + struct ext4_journal_cb_entry *jce; + + BUG_ON(txn->t_state == T_FINISHED); + + ext4_process_freed_data(sb, txn->t_tid); + ext4_maybe_update_superblock(sb); + + spin_lock(&sbi->s_md_lock); + while (!list_empty(&txn->t_private_list)) { + jce = list_entry(txn->t_private_list.next, + struct ext4_journal_cb_entry, jce_list); + list_del_init(&jce->jce_list); + spin_unlock(&sbi->s_md_lock); + jce->jce_func(sb, jce, error); + spin_lock(&sbi->s_md_lock); + } + spin_unlock(&sbi->s_md_lock); +} + +/* + * This writepage callback for write_cache_pages() + * takes care of a few cases after page cleaning. + * + * write_cache_pages() already checks for dirty pages + * and calls clear_page_dirty_for_io(), which we want, + * to write protect the pages. + * + * However, we may have to redirty a page (see below.) + */ +static int ext4_journalled_writepage_callback(struct folio *folio, + struct writeback_control *wbc, + void *data) +{ + transaction_t *transaction = (transaction_t *) data; + struct buffer_head *bh, *head; + struct journal_head *jh; + + bh = head = folio_buffers(folio); + do { + /* + * We have to redirty a page in these cases: + * 1) If buffer is dirty, it means the page was dirty because it + * contains a buffer that needs checkpointing. So the dirty bit + * needs to be preserved so that checkpointing writes the buffer + * properly. + * 2) If buffer is not part of the committing transaction + * (we may have just accidentally come across this buffer because + * inode range tracking is not exact) or if the currently running + * transaction already contains this buffer as well, dirty bit + * needs to be preserved so that the buffer gets writeprotected + * properly on running transaction's commit. + */ + jh = bh2jh(bh); + if (buffer_dirty(bh) || + (jh && (jh->b_transaction != transaction || + jh->b_next_transaction))) { + folio_redirty_for_writepage(wbc, folio); + goto out; + } + } while ((bh = bh->b_this_page) != head); + +out: + return AOP_WRITEPAGE_ACTIVATE; +} + +static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode) +{ + struct address_space *mapping = jinode->i_vfs_inode->i_mapping; + struct writeback_control wbc = { + .sync_mode = WB_SYNC_ALL, + .nr_to_write = LONG_MAX, + .range_start = jinode->i_dirty_start, + .range_end = jinode->i_dirty_end, + }; + + return write_cache_pages(mapping, &wbc, + ext4_journalled_writepage_callback, + jinode->i_transaction); +} + +static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode) +{ + int ret; + + if (ext4_should_journal_data(jinode->i_vfs_inode)) + ret = ext4_journalled_submit_inode_data_buffers(jinode); + else + ret = ext4_normal_submit_inode_data_buffers(jinode); + return ret; +} + +static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode) +{ + int ret = 0; + + if (!ext4_should_journal_data(jinode->i_vfs_inode)) + ret = jbd2_journal_finish_inode_data_buffers(jinode); + + return ret; +} + +static bool system_going_down(void) +{ + return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF + || system_state == SYSTEM_RESTART; +} + +struct ext4_err_translation { + int code; + int errno; +}; + +#define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err } + +static struct ext4_err_translation err_translation[] = { + EXT4_ERR_TRANSLATE(EIO), + EXT4_ERR_TRANSLATE(ENOMEM), + EXT4_ERR_TRANSLATE(EFSBADCRC), + EXT4_ERR_TRANSLATE(EFSCORRUPTED), + EXT4_ERR_TRANSLATE(ENOSPC), + EXT4_ERR_TRANSLATE(ENOKEY), + EXT4_ERR_TRANSLATE(EROFS), + EXT4_ERR_TRANSLATE(EFBIG), + EXT4_ERR_TRANSLATE(EEXIST), + EXT4_ERR_TRANSLATE(ERANGE), + EXT4_ERR_TRANSLATE(EOVERFLOW), + EXT4_ERR_TRANSLATE(EBUSY), + EXT4_ERR_TRANSLATE(ENOTDIR), + EXT4_ERR_TRANSLATE(ENOTEMPTY), + EXT4_ERR_TRANSLATE(ESHUTDOWN), + EXT4_ERR_TRANSLATE(EFAULT), +}; + +static int ext4_errno_to_code(int errno) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(err_translation); i++) + if (err_translation[i].errno == errno) + return err_translation[i].code; + return EXT4_ERR_UNKNOWN; +} + +static void save_error_info(struct super_block *sb, int error, + __u32 ino, __u64 block, + const char *func, unsigned int line) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + /* We default to EFSCORRUPTED error... */ + if (error == 0) + error = EFSCORRUPTED; + + spin_lock(&sbi->s_error_lock); + sbi->s_add_error_count++; + sbi->s_last_error_code = error; + sbi->s_last_error_line = line; + sbi->s_last_error_ino = ino; + sbi->s_last_error_block = block; + sbi->s_last_error_func = func; + sbi->s_last_error_time = ktime_get_real_seconds(); + if (!sbi->s_first_error_time) { + sbi->s_first_error_code = error; + sbi->s_first_error_line = line; + sbi->s_first_error_ino = ino; + sbi->s_first_error_block = block; + sbi->s_first_error_func = func; + sbi->s_first_error_time = sbi->s_last_error_time; + } + spin_unlock(&sbi->s_error_lock); +} + +/* Deal with the reporting of failure conditions on a filesystem such as + * inconsistencies detected or read IO failures. + * + * On ext2, we can store the error state of the filesystem in the + * superblock. That is not possible on ext4, because we may have other + * write ordering constraints on the superblock which prevent us from + * writing it out straight away; and given that the journal is about to + * be aborted, we can't rely on the current, or future, transactions to + * write out the superblock safely. + * + * We'll just use the jbd2_journal_abort() error code to record an error in + * the journal instead. On recovery, the journal will complain about + * that error until we've noted it down and cleared it. + * + * If force_ro is set, we unconditionally force the filesystem into an + * ABORT|READONLY state, unless the error response on the fs has been set to + * panic in which case we take the easy way out and panic immediately. This is + * used to deal with unrecoverable failures such as journal IO errors or ENOMEM + * at a critical moment in log management. + */ +static void ext4_handle_error(struct super_block *sb, bool force_ro, int error, + __u32 ino, __u64 block, + const char *func, unsigned int line) +{ + journal_t *journal = EXT4_SB(sb)->s_journal; + bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT); + + EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; + if (test_opt(sb, WARN_ON_ERROR)) + WARN_ON_ONCE(1); + + if (!continue_fs && !sb_rdonly(sb)) { + set_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); + if (journal) + jbd2_journal_abort(journal, -EIO); + } + + if (!bdev_read_only(sb->s_bdev)) { + save_error_info(sb, error, ino, block, func, line); + /* + * In case the fs should keep running, we need to writeout + * superblock through the journal. Due to lock ordering + * constraints, it may not be safe to do it right here so we + * defer superblock flushing to a workqueue. + */ + if (continue_fs && journal) + schedule_work(&EXT4_SB(sb)->s_sb_upd_work); + else + ext4_commit_super(sb); + } + + /* + * We force ERRORS_RO behavior when system is rebooting. Otherwise we + * could panic during 'reboot -f' as the underlying device got already + * disabled. + */ + if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) { + panic("EXT4-fs (device %s): panic forced after error\n", + sb->s_id); + } + + if (sb_rdonly(sb) || continue_fs) + return; + + ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); + /* + * Make sure updated value of ->s_mount_flags will be visible before + * ->s_flags update + */ + smp_wmb(); + sb->s_flags |= SB_RDONLY; +} + +static void update_super_work(struct work_struct *work) +{ + struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info, + s_sb_upd_work); + journal_t *journal = sbi->s_journal; + handle_t *handle; + + /* + * If the journal is still running, we have to write out superblock + * through the journal to avoid collisions of other journalled sb + * updates. + * + * We use directly jbd2 functions here to avoid recursing back into + * ext4 error handling code during handling of previous errors. + */ + if (!sb_rdonly(sbi->s_sb) && journal) { + struct buffer_head *sbh = sbi->s_sbh; + bool call_notify_err = false; + + handle = jbd2_journal_start(journal, 1); + if (IS_ERR(handle)) + goto write_directly; + if (jbd2_journal_get_write_access(handle, sbh)) { + jbd2_journal_stop(handle); + goto write_directly; + } + + if (sbi->s_add_error_count > 0) + call_notify_err = true; + + ext4_update_super(sbi->s_sb); + if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) { + ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to " + "superblock detected"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + + if (jbd2_journal_dirty_metadata(handle, sbh)) { + jbd2_journal_stop(handle); + goto write_directly; + } + jbd2_journal_stop(handle); + + if (call_notify_err) + ext4_notify_error_sysfs(sbi); + + return; + } +write_directly: + /* + * Write through journal failed. Write sb directly to get error info + * out and hope for the best. + */ + ext4_commit_super(sbi->s_sb); + ext4_notify_error_sysfs(sbi); +} + +#define ext4_error_ratelimit(sb) \ + ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ + "EXT4-fs error") + +void __ext4_error(struct super_block *sb, const char *function, + unsigned int line, bool force_ro, int error, __u64 block, + const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (unlikely(ext4_forced_shutdown(sb))) + return; + + trace_ext4_error(sb, function, line); + if (ext4_error_ratelimit(sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", + sb->s_id, function, line, current->comm, &vaf); + va_end(args); + } + fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED); + + ext4_handle_error(sb, force_ro, error, 0, block, function, line); +} + +void __ext4_error_inode(struct inode *inode, const char *function, + unsigned int line, ext4_fsblk_t block, int error, + const char *fmt, ...) +{ + va_list args; + struct va_format vaf; + + if (unlikely(ext4_forced_shutdown(inode->i_sb))) + return; + + trace_ext4_error(inode->i_sb, function, line); + if (ext4_error_ratelimit(inode->i_sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + if (block) + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " + "inode #%lu: block %llu: comm %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + block, current->comm, &vaf); + else + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " + "inode #%lu: comm %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + current->comm, &vaf); + va_end(args); + } + fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED); + + ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block, + function, line); +} + +void __ext4_error_file(struct file *file, const char *function, + unsigned int line, ext4_fsblk_t block, + const char *fmt, ...) +{ + va_list args; + struct va_format vaf; + struct inode *inode = file_inode(file); + char pathname[80], *path; + + if (unlikely(ext4_forced_shutdown(inode->i_sb))) + return; + + trace_ext4_error(inode->i_sb, function, line); + if (ext4_error_ratelimit(inode->i_sb)) { + path = file_path(file, pathname, sizeof(pathname)); + if (IS_ERR(path)) + path = "(unknown)"; + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + if (block) + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: inode #%lu: " + "block %llu: comm %s: path %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + block, current->comm, path, &vaf); + else + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: inode #%lu: " + "comm %s: path %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + current->comm, path, &vaf); + va_end(args); + } + fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED); + + ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block, + function, line); +} + +const char *ext4_decode_error(struct super_block *sb, int errno, + char nbuf[16]) +{ + char *errstr = NULL; + + switch (errno) { + case -EFSCORRUPTED: + errstr = "Corrupt filesystem"; + break; + case -EFSBADCRC: + errstr = "Filesystem failed CRC"; + break; + case -EIO: + errstr = "IO failure"; + break; + case -ENOMEM: + errstr = "Out of memory"; + break; + case -EROFS: + if (!sb || (EXT4_SB(sb)->s_journal && + EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) + errstr = "Journal has aborted"; + else + errstr = "Readonly filesystem"; + break; + default: + /* If the caller passed in an extra buffer for unknown + * errors, textualise them now. Else we just return + * NULL. */ + if (nbuf) { + /* Check for truncated error codes... */ + if (snprintf(nbuf, 16, "error %d", -errno) >= 0) + errstr = nbuf; + } + break; + } + + return errstr; +} + +/* __ext4_std_error decodes expected errors from journaling functions + * automatically and invokes the appropriate error response. */ + +void __ext4_std_error(struct super_block *sb, const char *function, + unsigned int line, int errno) +{ + char nbuf[16]; + const char *errstr; + + if (unlikely(ext4_forced_shutdown(sb))) + return; + + /* Special case: if the error is EROFS, and we're not already + * inside a transaction, then there's really no point in logging + * an error. */ + if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb)) + return; + + if (ext4_error_ratelimit(sb)) { + errstr = ext4_decode_error(sb, errno, nbuf); + printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", + sb->s_id, function, line, errstr); + } + fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED); + + ext4_handle_error(sb, false, -errno, 0, 0, function, line); +} + +void __ext4_msg(struct super_block *sb, + const char *prefix, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (sb) { + atomic_inc(&EXT4_SB(sb)->s_msg_count); + if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), + "EXT4-fs")) + return; + } + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + if (sb) + printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); + else + printk("%sEXT4-fs: %pV\n", prefix, &vaf); + va_end(args); +} + +static int ext4_warning_ratelimit(struct super_block *sb) +{ + atomic_inc(&EXT4_SB(sb)->s_warning_count); + return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), + "EXT4-fs warning"); +} + +void __ext4_warning(struct super_block *sb, const char *function, + unsigned int line, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (!ext4_warning_ratelimit(sb)) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", + sb->s_id, function, line, &vaf); + va_end(args); +} + +void __ext4_warning_inode(const struct inode *inode, const char *function, + unsigned int line, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (!ext4_warning_ratelimit(inode->i_sb)) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: " + "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id, + function, line, inode->i_ino, current->comm, &vaf); + va_end(args); +} + +void __ext4_grp_locked_error(const char *function, unsigned int line, + struct super_block *sb, ext4_group_t grp, + unsigned long ino, ext4_fsblk_t block, + const char *fmt, ...) +__releases(bitlock) +__acquires(bitlock) +{ + struct va_format vaf; + va_list args; + + if (unlikely(ext4_forced_shutdown(sb))) + return; + + trace_ext4_error(sb, function, line); + if (ext4_error_ratelimit(sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", + sb->s_id, function, line, grp); + if (ino) + printk(KERN_CONT "inode %lu: ", ino); + if (block) + printk(KERN_CONT "block %llu:", + (unsigned long long) block); + printk(KERN_CONT "%pV\n", &vaf); + va_end(args); + } + + if (test_opt(sb, ERRORS_CONT)) { + if (test_opt(sb, WARN_ON_ERROR)) + WARN_ON_ONCE(1); + EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; + if (!bdev_read_only(sb->s_bdev)) { + save_error_info(sb, EFSCORRUPTED, ino, block, function, + line); + schedule_work(&EXT4_SB(sb)->s_sb_upd_work); + } + return; + } + ext4_unlock_group(sb, grp); + ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line); + /* + * We only get here in the ERRORS_RO case; relocking the group + * may be dangerous, but nothing bad will happen since the + * filesystem will have already been marked read/only and the + * journal has been aborted. We return 1 as a hint to callers + * who might what to use the return value from + * ext4_grp_locked_error() to distinguish between the + * ERRORS_CONT and ERRORS_RO case, and perhaps return more + * aggressively from the ext4 function in question, with a + * more appropriate error code. + */ + ext4_lock_group(sb, grp); + return; +} + +void ext4_mark_group_bitmap_corrupted(struct super_block *sb, + ext4_group_t group, + unsigned int flags) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_info *grp = ext4_get_group_info(sb, group); + struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL); + int ret; + + if (!grp || !gdp) + return; + if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) { + ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, + &grp->bb_state); + if (!ret) + percpu_counter_sub(&sbi->s_freeclusters_counter, + grp->bb_free); + } + + if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) { + ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, + &grp->bb_state); + if (!ret && gdp) { + int count; + + count = ext4_free_inodes_count(sb, gdp); + percpu_counter_sub(&sbi->s_freeinodes_counter, + count); + } + } +} + +void ext4_update_dynamic_rev(struct super_block *sb) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) + return; + + ext4_warning(sb, + "updating to rev %d because of new feature flag, " + "running e2fsck is recommended", + EXT4_DYNAMIC_REV); + + es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); + es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); + es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); + /* leave es->s_feature_*compat flags alone */ + /* es->s_uuid will be set by e2fsck if empty */ + + /* + * The rest of the superblock fields should be zero, and if not it + * means they are likely already in use, so leave them alone. We + * can leave it up to e2fsck to clean up any inconsistencies there. + */ +} + +static inline struct inode *orphan_list_entry(struct list_head *l) +{ + return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; +} + +static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) +{ + struct list_head *l; + + ext4_msg(sb, KERN_ERR, "sb orphan head is %d", + le32_to_cpu(sbi->s_es->s_last_orphan)); + + printk(KERN_ERR "sb_info orphan list:\n"); + list_for_each(l, &sbi->s_orphan) { + struct inode *inode = orphan_list_entry(l); + printk(KERN_ERR " " + "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", + inode->i_sb->s_id, inode->i_ino, inode, + inode->i_mode, inode->i_nlink, + NEXT_ORPHAN(inode)); + } +} + +#ifdef CONFIG_QUOTA +static int ext4_quota_off(struct super_block *sb, int type); + +static inline void ext4_quotas_off(struct super_block *sb, int type) +{ + BUG_ON(type > EXT4_MAXQUOTAS); + + /* Use our quota_off function to clear inode flags etc. */ + for (type--; type >= 0; type--) + ext4_quota_off(sb, type); +} + +/* + * This is a helper function which is used in the mount/remount + * codepaths (which holds s_umount) to fetch the quota file name. + */ +static inline char *get_qf_name(struct super_block *sb, + struct ext4_sb_info *sbi, + int type) +{ + return rcu_dereference_protected(sbi->s_qf_names[type], + lockdep_is_held(&sb->s_umount)); +} +#else +static inline void ext4_quotas_off(struct super_block *sb, int type) +{ +} +#endif + +static int ext4_percpu_param_init(struct ext4_sb_info *sbi) +{ + ext4_fsblk_t block; + int err; + + block = ext4_count_free_clusters(sbi->s_sb); + ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block)); + err = percpu_counter_init(&sbi->s_freeclusters_counter, block, + GFP_KERNEL); + if (!err) { + unsigned long freei = ext4_count_free_inodes(sbi->s_sb); + sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); + err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, + GFP_KERNEL); + } + if (!err) + err = percpu_counter_init(&sbi->s_dirs_counter, + ext4_count_dirs(sbi->s_sb), GFP_KERNEL); + if (!err) + err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, + GFP_KERNEL); + if (!err) + err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0, + GFP_KERNEL); + if (!err) + err = percpu_init_rwsem(&sbi->s_writepages_rwsem); + + if (err) + ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory"); + + return err; +} + +static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi) +{ + percpu_counter_destroy(&sbi->s_freeclusters_counter); + percpu_counter_destroy(&sbi->s_freeinodes_counter); + percpu_counter_destroy(&sbi->s_dirs_counter); + percpu_counter_destroy(&sbi->s_dirtyclusters_counter); + percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit); + percpu_free_rwsem(&sbi->s_writepages_rwsem); +} + +static void ext4_group_desc_free(struct ext4_sb_info *sbi) +{ + struct buffer_head **group_desc; + int i; + + rcu_read_lock(); + group_desc = rcu_dereference(sbi->s_group_desc); + for (i = 0; i < sbi->s_gdb_count; i++) + brelse(group_desc[i]); + kvfree(group_desc); + rcu_read_unlock(); +} + +static void ext4_flex_groups_free(struct ext4_sb_info *sbi) +{ + struct flex_groups **flex_groups; + int i; + + rcu_read_lock(); + flex_groups = rcu_dereference(sbi->s_flex_groups); + if (flex_groups) { + for (i = 0; i < sbi->s_flex_groups_allocated; i++) + kvfree(flex_groups[i]); + kvfree(flex_groups); + } + rcu_read_unlock(); +} + +static void ext4_put_super(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int aborted = 0; + int err; + + /* + * Unregister sysfs before destroying jbd2 journal. + * Since we could still access attr_journal_task attribute via sysfs + * path which could have sbi->s_journal->j_task as NULL + * Unregister sysfs before flush sbi->s_sb_upd_work. + * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If + * read metadata verify failed then will queue error work. + * update_super_work will call start_this_handle may trigger + * BUG_ON. + */ + ext4_unregister_sysfs(sb); + + if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount")) + ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.", + &sb->s_uuid); + + ext4_unregister_li_request(sb); + ext4_quotas_off(sb, EXT4_MAXQUOTAS); + + flush_work(&sbi->s_sb_upd_work); + destroy_workqueue(sbi->rsv_conversion_wq); + ext4_release_orphan_info(sb); + + if (sbi->s_journal) { + aborted = is_journal_aborted(sbi->s_journal); + err = jbd2_journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + if ((err < 0) && !aborted) { + ext4_abort(sb, -err, "Couldn't clean up the journal"); + } + } + + ext4_es_unregister_shrinker(sbi); + timer_shutdown_sync(&sbi->s_err_report); + ext4_release_system_zone(sb); + ext4_mb_release(sb); + ext4_ext_release(sb); + + if (!sb_rdonly(sb) && !aborted) { + ext4_clear_feature_journal_needs_recovery(sb); + ext4_clear_feature_orphan_present(sb); + es->s_state = cpu_to_le16(sbi->s_mount_state); + } + if (!sb_rdonly(sb)) + ext4_commit_super(sb); + + ext4_group_desc_free(sbi); + ext4_flex_groups_free(sbi); + ext4_percpu_param_destroy(sbi); +#ifdef CONFIG_QUOTA + for (int i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(get_qf_name(sb, sbi, i)); +#endif + + /* Debugging code just in case the in-memory inode orphan list + * isn't empty. The on-disk one can be non-empty if we've + * detected an error and taken the fs readonly, but the + * in-memory list had better be clean by this point. */ + if (!list_empty(&sbi->s_orphan)) + dump_orphan_list(sb, sbi); + ASSERT(list_empty(&sbi->s_orphan)); + + sync_blockdev(sb->s_bdev); + invalidate_bdev(sb->s_bdev); + if (sbi->s_journal_bdev) { + /* + * Invalidate the journal device's buffers. We don't want them + * floating about in memory - the physical journal device may + * hotswapped, and it breaks the `ro-after' testing code. + */ + sync_blockdev(sbi->s_journal_bdev); + invalidate_bdev(sbi->s_journal_bdev); + } + + ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); + sbi->s_ea_inode_cache = NULL; + + ext4_xattr_destroy_cache(sbi->s_ea_block_cache); + sbi->s_ea_block_cache = NULL; + + ext4_stop_mmpd(sbi); + + brelse(sbi->s_sbh); + sb->s_fs_info = NULL; + /* + * Now that we are completely done shutting down the + * superblock, we need to actually destroy the kobject. + */ + kobject_put(&sbi->s_kobj); + wait_for_completion(&sbi->s_kobj_unregister); + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); + kfree(sbi->s_blockgroup_lock); + fs_put_dax(sbi->s_daxdev, NULL); + fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy); +#if IS_ENABLED(CONFIG_UNICODE) + utf8_unload(sb->s_encoding); +#endif + kfree(sbi); +} + +static struct kmem_cache *ext4_inode_cachep; + +/* + * Called inside transaction, so use GFP_NOFS + */ +static struct inode *ext4_alloc_inode(struct super_block *sb) +{ + struct ext4_inode_info *ei; + + ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS); + if (!ei) + return NULL; + + inode_set_iversion(&ei->vfs_inode, 1); + ei->i_flags = 0; + spin_lock_init(&ei->i_raw_lock); + ei->i_prealloc_node = RB_ROOT; + atomic_set(&ei->i_prealloc_active, 0); + rwlock_init(&ei->i_prealloc_lock); + ext4_es_init_tree(&ei->i_es_tree); + rwlock_init(&ei->i_es_lock); + INIT_LIST_HEAD(&ei->i_es_list); + ei->i_es_all_nr = 0; + ei->i_es_shk_nr = 0; + ei->i_es_shrink_lblk = 0; + ei->i_reserved_data_blocks = 0; + spin_lock_init(&(ei->i_block_reservation_lock)); + ext4_init_pending_tree(&ei->i_pending_tree); +#ifdef CONFIG_QUOTA + ei->i_reserved_quota = 0; + memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); +#endif + ei->jinode = NULL; + INIT_LIST_HEAD(&ei->i_rsv_conversion_list); + spin_lock_init(&ei->i_completed_io_lock); + ei->i_sync_tid = 0; + ei->i_datasync_tid = 0; + atomic_set(&ei->i_unwritten, 0); + INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); + ext4_fc_init_inode(&ei->vfs_inode); + mutex_init(&ei->i_fc_lock); + return &ei->vfs_inode; +} + +static int ext4_drop_inode(struct inode *inode) +{ + int drop = generic_drop_inode(inode); + + if (!drop) + drop = fscrypt_drop_inode(inode); + + trace_ext4_drop_inode(inode, drop); + return drop; +} + +static void ext4_free_in_core_inode(struct inode *inode) +{ + fscrypt_free_inode(inode); + if (!list_empty(&(EXT4_I(inode)->i_fc_list))) { + pr_warn("%s: inode %ld still in fc list", + __func__, inode->i_ino); + } + kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); +} + +static void ext4_destroy_inode(struct inode *inode) +{ + if (!list_empty(&(EXT4_I(inode)->i_orphan))) { + ext4_msg(inode->i_sb, KERN_ERR, + "Inode %lu (%p): orphan list check failed!", + inode->i_ino, EXT4_I(inode)); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, + EXT4_I(inode), sizeof(struct ext4_inode_info), + true); + dump_stack(); + } + + if (EXT4_I(inode)->i_reserved_data_blocks) + ext4_msg(inode->i_sb, KERN_ERR, + "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!", + inode->i_ino, EXT4_I(inode), + EXT4_I(inode)->i_reserved_data_blocks); +} + +static void ext4_shutdown(struct super_block *sb) +{ + ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH); +} + +static void init_once(void *foo) +{ + struct ext4_inode_info *ei = foo; + + INIT_LIST_HEAD(&ei->i_orphan); + init_rwsem(&ei->xattr_sem); + init_rwsem(&ei->i_data_sem); + inode_init_once(&ei->vfs_inode); + ext4_fc_init_inode(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache", + sizeof(struct ext4_inode_info), 0, + (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| + SLAB_ACCOUNT), + offsetof(struct ext4_inode_info, i_data), + sizeof_field(struct ext4_inode_info, i_data), + init_once); + if (ext4_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(ext4_inode_cachep); +} + +void ext4_clear_inode(struct inode *inode) +{ + ext4_fc_del(inode); + invalidate_inode_buffers(inode); + clear_inode(inode); + ext4_discard_preallocations(inode, 0); + ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); + dquot_drop(inode); + if (EXT4_I(inode)->jinode) { + jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), + EXT4_I(inode)->jinode); + jbd2_free_inode(EXT4_I(inode)->jinode); + EXT4_I(inode)->jinode = NULL; + } + fscrypt_put_encryption_info(inode); + fsverity_cleanup_inode(inode); +} + +static struct inode *ext4_nfs_get_inode(struct super_block *sb, + u64 ino, u32 generation) +{ + struct inode *inode; + + /* + * Currently we don't know the generation for parent directory, so + * a generation of 0 means "accept any" + */ + inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE); + if (IS_ERR(inode)) + return ERR_CAST(inode); + if (generation && inode->i_generation != generation) { + iput(inode); + return ERR_PTR(-ESTALE); + } + + return inode; +} + +static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, + ext4_nfs_get_inode); +} + +static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_parent(sb, fid, fh_len, fh_type, + ext4_nfs_get_inode); +} + +static int ext4_nfs_commit_metadata(struct inode *inode) +{ + struct writeback_control wbc = { + .sync_mode = WB_SYNC_ALL + }; + + trace_ext4_nfs_commit_metadata(inode); + return ext4_write_inode(inode, &wbc); +} + +#ifdef CONFIG_QUOTA +static const char * const quotatypes[] = INITQFNAMES; +#define QTYPE2NAME(t) (quotatypes[t]) + +static int ext4_write_dquot(struct dquot *dquot); +static int ext4_acquire_dquot(struct dquot *dquot); +static int ext4_release_dquot(struct dquot *dquot); +static int ext4_mark_dquot_dirty(struct dquot *dquot); +static int ext4_write_info(struct super_block *sb, int type); +static int ext4_quota_on(struct super_block *sb, int type, int format_id, + const struct path *path); +static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off); +static ssize_t ext4_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off); +static int ext4_quota_enable(struct super_block *sb, int type, int format_id, + unsigned int flags); + +static struct dquot **ext4_get_dquots(struct inode *inode) +{ + return EXT4_I(inode)->i_dquot; +} + +static const struct dquot_operations ext4_quota_operations = { + .get_reserved_space = ext4_get_reserved_space, + .write_dquot = ext4_write_dquot, + .acquire_dquot = ext4_acquire_dquot, + .release_dquot = ext4_release_dquot, + .mark_dirty = ext4_mark_dquot_dirty, + .write_info = ext4_write_info, + .alloc_dquot = dquot_alloc, + .destroy_dquot = dquot_destroy, + .get_projid = ext4_get_projid, + .get_inode_usage = ext4_get_inode_usage, + .get_next_id = dquot_get_next_id, +}; + +static const struct quotactl_ops ext4_qctl_operations = { + .quota_on = ext4_quota_on, + .quota_off = ext4_quota_off, + .quota_sync = dquot_quota_sync, + .get_state = dquot_get_state, + .set_info = dquot_set_dqinfo, + .get_dqblk = dquot_get_dqblk, + .set_dqblk = dquot_set_dqblk, + .get_nextdqblk = dquot_get_next_dqblk, +}; +#endif + +static const struct super_operations ext4_sops = { + .alloc_inode = ext4_alloc_inode, + .free_inode = ext4_free_in_core_inode, + .destroy_inode = ext4_destroy_inode, + .write_inode = ext4_write_inode, + .dirty_inode = ext4_dirty_inode, + .drop_inode = ext4_drop_inode, + .evict_inode = ext4_evict_inode, + .put_super = ext4_put_super, + .sync_fs = ext4_sync_fs, + .freeze_fs = ext4_freeze, + .unfreeze_fs = ext4_unfreeze, + .statfs = ext4_statfs, + .show_options = ext4_show_options, + .shutdown = ext4_shutdown, +#ifdef CONFIG_QUOTA + .quota_read = ext4_quota_read, + .quota_write = ext4_quota_write, + .get_dquots = ext4_get_dquots, +#endif +}; + +static const struct export_operations ext4_export_ops = { + .fh_to_dentry = ext4_fh_to_dentry, + .fh_to_parent = ext4_fh_to_parent, + .get_parent = ext4_get_parent, + .commit_metadata = ext4_nfs_commit_metadata, +}; + +enum { + Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, + Opt_resgid, Opt_resuid, Opt_sb, + Opt_nouid32, Opt_debug, Opt_removed, + Opt_user_xattr, Opt_acl, + Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, + Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, + Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, + Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, + Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, + Opt_inlinecrypt, + Opt_usrjquota, Opt_grpjquota, Opt_quota, + Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, + Opt_usrquota, Opt_grpquota, Opt_prjquota, + Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never, + Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error, + Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize, + Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, + Opt_inode_readahead_blks, Opt_journal_ioprio, + Opt_dioread_nolock, Opt_dioread_lock, + Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, + Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache, + Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan, + Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type, +#ifdef CONFIG_EXT4_DEBUG + Opt_fc_debug_max_replay, Opt_fc_debug_force +#endif +}; + +static const struct constant_table ext4_param_errors[] = { + {"continue", EXT4_MOUNT_ERRORS_CONT}, + {"panic", EXT4_MOUNT_ERRORS_PANIC}, + {"remount-ro", EXT4_MOUNT_ERRORS_RO}, + {} +}; + +static const struct constant_table ext4_param_data[] = { + {"journal", EXT4_MOUNT_JOURNAL_DATA}, + {"ordered", EXT4_MOUNT_ORDERED_DATA}, + {"writeback", EXT4_MOUNT_WRITEBACK_DATA}, + {} +}; + +static const struct constant_table ext4_param_data_err[] = { + {"abort", Opt_data_err_abort}, + {"ignore", Opt_data_err_ignore}, + {} +}; + +static const struct constant_table ext4_param_jqfmt[] = { + {"vfsold", QFMT_VFS_OLD}, + {"vfsv0", QFMT_VFS_V0}, + {"vfsv1", QFMT_VFS_V1}, + {} +}; + +static const struct constant_table ext4_param_dax[] = { + {"always", Opt_dax_always}, + {"inode", Opt_dax_inode}, + {"never", Opt_dax_never}, + {} +}; + +/* String parameter that allows empty argument */ +#define fsparam_string_empty(NAME, OPT) \ + __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL) + +/* + * Mount option specification + * We don't use fsparam_flag_no because of the way we set the + * options and the way we show them in _ext4_show_options(). To + * keep the changes to a minimum, let's keep the negative options + * separate for now. + */ +static const struct fs_parameter_spec ext4_param_specs[] = { + fsparam_flag ("bsddf", Opt_bsd_df), + fsparam_flag ("minixdf", Opt_minix_df), + fsparam_flag ("grpid", Opt_grpid), + fsparam_flag ("bsdgroups", Opt_grpid), + fsparam_flag ("nogrpid", Opt_nogrpid), + fsparam_flag ("sysvgroups", Opt_nogrpid), + fsparam_u32 ("resgid", Opt_resgid), + fsparam_u32 ("resuid", Opt_resuid), + fsparam_u32 ("sb", Opt_sb), + fsparam_enum ("errors", Opt_errors, ext4_param_errors), + fsparam_flag ("nouid32", Opt_nouid32), + fsparam_flag ("debug", Opt_debug), + fsparam_flag ("oldalloc", Opt_removed), + fsparam_flag ("orlov", Opt_removed), + fsparam_flag ("user_xattr", Opt_user_xattr), + fsparam_flag ("acl", Opt_acl), + fsparam_flag ("norecovery", Opt_noload), + fsparam_flag ("noload", Opt_noload), + fsparam_flag ("bh", Opt_removed), + fsparam_flag ("nobh", Opt_removed), + fsparam_u32 ("commit", Opt_commit), + fsparam_u32 ("min_batch_time", Opt_min_batch_time), + fsparam_u32 ("max_batch_time", Opt_max_batch_time), + fsparam_u32 ("journal_dev", Opt_journal_dev), + fsparam_bdev ("journal_path", Opt_journal_path), + fsparam_flag ("journal_checksum", Opt_journal_checksum), + fsparam_flag ("nojournal_checksum", Opt_nojournal_checksum), + fsparam_flag ("journal_async_commit",Opt_journal_async_commit), + fsparam_flag ("abort", Opt_abort), + fsparam_enum ("data", Opt_data, ext4_param_data), + fsparam_enum ("data_err", Opt_data_err, + ext4_param_data_err), + fsparam_string_empty + ("usrjquota", Opt_usrjquota), + fsparam_string_empty + ("grpjquota", Opt_grpjquota), + fsparam_enum ("jqfmt", Opt_jqfmt, ext4_param_jqfmt), + fsparam_flag ("grpquota", Opt_grpquota), + fsparam_flag ("quota", Opt_quota), + fsparam_flag ("noquota", Opt_noquota), + fsparam_flag ("usrquota", Opt_usrquota), + fsparam_flag ("prjquota", Opt_prjquota), + fsparam_flag ("barrier", Opt_barrier), + fsparam_u32 ("barrier", Opt_barrier), + fsparam_flag ("nobarrier", Opt_nobarrier), + fsparam_flag ("i_version", Opt_removed), + fsparam_flag ("dax", Opt_dax), + fsparam_enum ("dax", Opt_dax_type, ext4_param_dax), + fsparam_u32 ("stripe", Opt_stripe), + fsparam_flag ("delalloc", Opt_delalloc), + fsparam_flag ("nodelalloc", Opt_nodelalloc), + fsparam_flag ("warn_on_error", Opt_warn_on_error), + fsparam_flag ("nowarn_on_error", Opt_nowarn_on_error), + fsparam_u32 ("debug_want_extra_isize", + Opt_debug_want_extra_isize), + fsparam_flag ("mblk_io_submit", Opt_removed), + fsparam_flag ("nomblk_io_submit", Opt_removed), + fsparam_flag ("block_validity", Opt_block_validity), + fsparam_flag ("noblock_validity", Opt_noblock_validity), + fsparam_u32 ("inode_readahead_blks", + Opt_inode_readahead_blks), + fsparam_u32 ("journal_ioprio", Opt_journal_ioprio), + fsparam_u32 ("auto_da_alloc", Opt_auto_da_alloc), + fsparam_flag ("auto_da_alloc", Opt_auto_da_alloc), + fsparam_flag ("noauto_da_alloc", Opt_noauto_da_alloc), + fsparam_flag ("dioread_nolock", Opt_dioread_nolock), + fsparam_flag ("nodioread_nolock", Opt_dioread_lock), + fsparam_flag ("dioread_lock", Opt_dioread_lock), + fsparam_flag ("discard", Opt_discard), + fsparam_flag ("nodiscard", Opt_nodiscard), + fsparam_u32 ("init_itable", Opt_init_itable), + fsparam_flag ("init_itable", Opt_init_itable), + fsparam_flag ("noinit_itable", Opt_noinit_itable), +#ifdef CONFIG_EXT4_DEBUG + fsparam_flag ("fc_debug_force", Opt_fc_debug_force), + fsparam_u32 ("fc_debug_max_replay", Opt_fc_debug_max_replay), +#endif + fsparam_u32 ("max_dir_size_kb", Opt_max_dir_size_kb), + fsparam_flag ("test_dummy_encryption", + Opt_test_dummy_encryption), + fsparam_string ("test_dummy_encryption", + Opt_test_dummy_encryption), + fsparam_flag ("inlinecrypt", Opt_inlinecrypt), + fsparam_flag ("nombcache", Opt_nombcache), + fsparam_flag ("no_mbcache", Opt_nombcache), /* for backward compatibility */ + fsparam_flag ("prefetch_block_bitmaps", + Opt_removed), + fsparam_flag ("no_prefetch_block_bitmaps", + Opt_no_prefetch_block_bitmaps), + fsparam_s32 ("mb_optimize_scan", Opt_mb_optimize_scan), + fsparam_string ("check", Opt_removed), /* mount option from ext2/3 */ + fsparam_flag ("nocheck", Opt_removed), /* mount option from ext2/3 */ + fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */ + fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */ + fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */ + {} +}; + +#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) + +#define MOPT_SET 0x0001 +#define MOPT_CLEAR 0x0002 +#define MOPT_NOSUPPORT 0x0004 +#define MOPT_EXPLICIT 0x0008 +#ifdef CONFIG_QUOTA +#define MOPT_Q 0 +#define MOPT_QFMT 0x0010 +#else +#define MOPT_Q MOPT_NOSUPPORT +#define MOPT_QFMT MOPT_NOSUPPORT +#endif +#define MOPT_NO_EXT2 0x0020 +#define MOPT_NO_EXT3 0x0040 +#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) +#define MOPT_SKIP 0x0080 +#define MOPT_2 0x0100 + +static const struct mount_opts { + int token; + int mount_opt; + int flags; +} ext4_mount_opts[] = { + {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, + {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, + {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, + {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, + {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, + {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, + {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, + MOPT_EXT4_ONLY | MOPT_SET}, + {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, + {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, + {Opt_delalloc, EXT4_MOUNT_DELALLOC, + MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, + {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET}, + {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR}, + {Opt_commit, 0, MOPT_NO_EXT2}, + {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, + MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, + {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | + EXT4_MOUNT_JOURNAL_CHECKSUM), + MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, + {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, + {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2}, + {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, + {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, + {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, + {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, + {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, + {Opt_dax_type, 0, MOPT_EXT4_ONLY}, + {Opt_journal_dev, 0, MOPT_NO_EXT2}, + {Opt_journal_path, 0, MOPT_NO_EXT2}, + {Opt_journal_ioprio, 0, MOPT_NO_EXT2}, + {Opt_data, 0, MOPT_NO_EXT2}, + {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, +#ifdef CONFIG_EXT4_FS_POSIX_ACL + {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, +#else + {Opt_acl, 0, MOPT_NOSUPPORT}, +#endif + {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, + {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, + {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, + {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, + MOPT_SET | MOPT_Q}, + {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, + MOPT_SET | MOPT_Q}, + {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA, + MOPT_SET | MOPT_Q}, + {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | + EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA), + MOPT_CLEAR | MOPT_Q}, + {Opt_usrjquota, 0, MOPT_Q}, + {Opt_grpjquota, 0, MOPT_Q}, + {Opt_jqfmt, 0, MOPT_QFMT}, + {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET}, + {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS, + MOPT_SET}, +#ifdef CONFIG_EXT4_DEBUG + {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT, + MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY}, +#endif + {Opt_abort, EXT4_MOUNT2_ABORT, MOPT_SET | MOPT_2}, + {Opt_err, 0, 0} +}; + +#if IS_ENABLED(CONFIG_UNICODE) +static const struct ext4_sb_encodings { + __u16 magic; + char *name; + unsigned int version; +} ext4_sb_encoding_map[] = { + {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)}, +}; + +static const struct ext4_sb_encodings * +ext4_sb_read_encoding(const struct ext4_super_block *es) +{ + __u16 magic = le16_to_cpu(es->s_encoding); + int i; + + for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++) + if (magic == ext4_sb_encoding_map[i].magic) + return &ext4_sb_encoding_map[i]; + + return NULL; +} +#endif + +#define EXT4_SPEC_JQUOTA (1 << 0) +#define EXT4_SPEC_JQFMT (1 << 1) +#define EXT4_SPEC_DATAJ (1 << 2) +#define EXT4_SPEC_SB_BLOCK (1 << 3) +#define EXT4_SPEC_JOURNAL_DEV (1 << 4) +#define EXT4_SPEC_JOURNAL_IOPRIO (1 << 5) +#define EXT4_SPEC_s_want_extra_isize (1 << 7) +#define EXT4_SPEC_s_max_batch_time (1 << 8) +#define EXT4_SPEC_s_min_batch_time (1 << 9) +#define EXT4_SPEC_s_inode_readahead_blks (1 << 10) +#define EXT4_SPEC_s_li_wait_mult (1 << 11) +#define EXT4_SPEC_s_max_dir_size_kb (1 << 12) +#define EXT4_SPEC_s_stripe (1 << 13) +#define EXT4_SPEC_s_resuid (1 << 14) +#define EXT4_SPEC_s_resgid (1 << 15) +#define EXT4_SPEC_s_commit_interval (1 << 16) +#define EXT4_SPEC_s_fc_debug_max_replay (1 << 17) +#define EXT4_SPEC_s_sb_block (1 << 18) +#define EXT4_SPEC_mb_optimize_scan (1 << 19) + +struct ext4_fs_context { + char *s_qf_names[EXT4_MAXQUOTAS]; + struct fscrypt_dummy_policy dummy_enc_policy; + int s_jquota_fmt; /* Format of quota to use */ +#ifdef CONFIG_EXT4_DEBUG + int s_fc_debug_max_replay; +#endif + unsigned short qname_spec; + unsigned long vals_s_flags; /* Bits to set in s_flags */ + unsigned long mask_s_flags; /* Bits changed in s_flags */ + unsigned long journal_devnum; + unsigned long s_commit_interval; + unsigned long s_stripe; + unsigned int s_inode_readahead_blks; + unsigned int s_want_extra_isize; + unsigned int s_li_wait_mult; + unsigned int s_max_dir_size_kb; + unsigned int journal_ioprio; + unsigned int vals_s_mount_opt; + unsigned int mask_s_mount_opt; + unsigned int vals_s_mount_opt2; + unsigned int mask_s_mount_opt2; + unsigned int opt_flags; /* MOPT flags */ + unsigned int spec; + u32 s_max_batch_time; + u32 s_min_batch_time; + kuid_t s_resuid; + kgid_t s_resgid; + ext4_fsblk_t s_sb_block; +}; + +static void ext4_fc_free(struct fs_context *fc) +{ + struct ext4_fs_context *ctx = fc->fs_private; + int i; + + if (!ctx) + return; + + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(ctx->s_qf_names[i]); + + fscrypt_free_dummy_policy(&ctx->dummy_enc_policy); + kfree(ctx); +} + +int ext4_init_fs_context(struct fs_context *fc) +{ + struct ext4_fs_context *ctx; + + ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + fc->fs_private = ctx; + fc->ops = &ext4_context_ops; + + return 0; +} + +#ifdef CONFIG_QUOTA +/* + * Note the name of the specified quota file. + */ +static int note_qf_name(struct fs_context *fc, int qtype, + struct fs_parameter *param) +{ + struct ext4_fs_context *ctx = fc->fs_private; + char *qname; + + if (param->size < 1) { + ext4_msg(NULL, KERN_ERR, "Missing quota name"); + return -EINVAL; + } + if (strchr(param->string, '/')) { + ext4_msg(NULL, KERN_ERR, + "quotafile must be on filesystem root"); + return -EINVAL; + } + if (ctx->s_qf_names[qtype]) { + if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) { + ext4_msg(NULL, KERN_ERR, + "%s quota file already specified", + QTYPE2NAME(qtype)); + return -EINVAL; + } + return 0; + } + + qname = kmemdup_nul(param->string, param->size, GFP_KERNEL); + if (!qname) { + ext4_msg(NULL, KERN_ERR, + "Not enough memory for storing quotafile name"); + return -ENOMEM; + } + ctx->s_qf_names[qtype] = qname; + ctx->qname_spec |= 1 << qtype; + ctx->spec |= EXT4_SPEC_JQUOTA; + return 0; +} + +/* + * Clear the name of the specified quota file. + */ +static int unnote_qf_name(struct fs_context *fc, int qtype) +{ + struct ext4_fs_context *ctx = fc->fs_private; + + if (ctx->s_qf_names[qtype]) + kfree(ctx->s_qf_names[qtype]); + + ctx->s_qf_names[qtype] = NULL; + ctx->qname_spec |= 1 << qtype; + ctx->spec |= EXT4_SPEC_JQUOTA; + return 0; +} +#endif + +static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param, + struct ext4_fs_context *ctx) +{ + int err; + + if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) { + ext4_msg(NULL, KERN_WARNING, + "test_dummy_encryption option not supported"); + return -EINVAL; + } + err = fscrypt_parse_test_dummy_encryption(param, + &ctx->dummy_enc_policy); + if (err == -EINVAL) { + ext4_msg(NULL, KERN_WARNING, + "Value of option \"%s\" is unrecognized", param->key); + } else if (err == -EEXIST) { + ext4_msg(NULL, KERN_WARNING, + "Conflicting test_dummy_encryption options"); + return -EINVAL; + } + return err; +} + +#define EXT4_SET_CTX(name) \ +static inline void ctx_set_##name(struct ext4_fs_context *ctx, \ + unsigned long flag) \ +{ \ + ctx->mask_s_##name |= flag; \ + ctx->vals_s_##name |= flag; \ +} + +#define EXT4_CLEAR_CTX(name) \ +static inline void ctx_clear_##name(struct ext4_fs_context *ctx, \ + unsigned long flag) \ +{ \ + ctx->mask_s_##name |= flag; \ + ctx->vals_s_##name &= ~flag; \ +} + +#define EXT4_TEST_CTX(name) \ +static inline unsigned long \ +ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \ +{ \ + return (ctx->vals_s_##name & flag); \ +} + +EXT4_SET_CTX(flags); /* set only */ +EXT4_SET_CTX(mount_opt); +EXT4_CLEAR_CTX(mount_opt); +EXT4_TEST_CTX(mount_opt); +EXT4_SET_CTX(mount_opt2); +EXT4_CLEAR_CTX(mount_opt2); +EXT4_TEST_CTX(mount_opt2); + +static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct ext4_fs_context *ctx = fc->fs_private; + struct fs_parse_result result; + const struct mount_opts *m; + int is_remount; + kuid_t uid; + kgid_t gid; + int token; + + token = fs_parse(fc, ext4_param_specs, param, &result); + if (token < 0) + return token; + is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE; + + for (m = ext4_mount_opts; m->token != Opt_err; m++) + if (token == m->token) + break; + + ctx->opt_flags |= m->flags; + + if (m->flags & MOPT_EXPLICIT) { + if (m->mount_opt & EXT4_MOUNT_DELALLOC) { + ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC); + } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) { + ctx_set_mount_opt2(ctx, + EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM); + } else + return -EINVAL; + } + + if (m->flags & MOPT_NOSUPPORT) { + ext4_msg(NULL, KERN_ERR, "%s option not supported", + param->key); + return 0; + } + + switch (token) { +#ifdef CONFIG_QUOTA + case Opt_usrjquota: + if (!*param->string) + return unnote_qf_name(fc, USRQUOTA); + else + return note_qf_name(fc, USRQUOTA, param); + case Opt_grpjquota: + if (!*param->string) + return unnote_qf_name(fc, GRPQUOTA); + else + return note_qf_name(fc, GRPQUOTA, param); +#endif + case Opt_sb: + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { + ext4_msg(NULL, KERN_WARNING, + "Ignoring %s option on remount", param->key); + } else { + ctx->s_sb_block = result.uint_32; + ctx->spec |= EXT4_SPEC_s_sb_block; + } + return 0; + case Opt_removed: + ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option", + param->key); + return 0; + case Opt_inlinecrypt: +#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT + ctx_set_flags(ctx, SB_INLINECRYPT); +#else + ext4_msg(NULL, KERN_ERR, "inline encryption not supported"); +#endif + return 0; + case Opt_errors: + ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK); + ctx_set_mount_opt(ctx, result.uint_32); + return 0; +#ifdef CONFIG_QUOTA + case Opt_jqfmt: + ctx->s_jquota_fmt = result.uint_32; + ctx->spec |= EXT4_SPEC_JQFMT; + return 0; +#endif + case Opt_data: + ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS); + ctx_set_mount_opt(ctx, result.uint_32); + ctx->spec |= EXT4_SPEC_DATAJ; + return 0; + case Opt_commit: + if (result.uint_32 == 0) + result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE; + else if (result.uint_32 > INT_MAX / HZ) { + ext4_msg(NULL, KERN_ERR, + "Invalid commit interval %d, " + "must be smaller than %d", + result.uint_32, INT_MAX / HZ); + return -EINVAL; + } + ctx->s_commit_interval = HZ * result.uint_32; + ctx->spec |= EXT4_SPEC_s_commit_interval; + return 0; + case Opt_debug_want_extra_isize: + if ((result.uint_32 & 1) || (result.uint_32 < 4)) { + ext4_msg(NULL, KERN_ERR, + "Invalid want_extra_isize %d", result.uint_32); + return -EINVAL; + } + ctx->s_want_extra_isize = result.uint_32; + ctx->spec |= EXT4_SPEC_s_want_extra_isize; + return 0; + case Opt_max_batch_time: + ctx->s_max_batch_time = result.uint_32; + ctx->spec |= EXT4_SPEC_s_max_batch_time; + return 0; + case Opt_min_batch_time: + ctx->s_min_batch_time = result.uint_32; + ctx->spec |= EXT4_SPEC_s_min_batch_time; + return 0; + case Opt_inode_readahead_blks: + if (result.uint_32 && + (result.uint_32 > (1 << 30) || + !is_power_of_2(result.uint_32))) { + ext4_msg(NULL, KERN_ERR, + "EXT4-fs: inode_readahead_blks must be " + "0 or a power of 2 smaller than 2^31"); + return -EINVAL; + } + ctx->s_inode_readahead_blks = result.uint_32; + ctx->spec |= EXT4_SPEC_s_inode_readahead_blks; + return 0; + case Opt_init_itable: + ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE); + ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; + if (param->type == fs_value_is_string) + ctx->s_li_wait_mult = result.uint_32; + ctx->spec |= EXT4_SPEC_s_li_wait_mult; + return 0; + case Opt_max_dir_size_kb: + ctx->s_max_dir_size_kb = result.uint_32; + ctx->spec |= EXT4_SPEC_s_max_dir_size_kb; + return 0; +#ifdef CONFIG_EXT4_DEBUG + case Opt_fc_debug_max_replay: + ctx->s_fc_debug_max_replay = result.uint_32; + ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay; + return 0; +#endif + case Opt_stripe: + ctx->s_stripe = result.uint_32; + ctx->spec |= EXT4_SPEC_s_stripe; + return 0; + case Opt_resuid: + uid = make_kuid(current_user_ns(), result.uint_32); + if (!uid_valid(uid)) { + ext4_msg(NULL, KERN_ERR, "Invalid uid value %d", + result.uint_32); + return -EINVAL; + } + ctx->s_resuid = uid; + ctx->spec |= EXT4_SPEC_s_resuid; + return 0; + case Opt_resgid: + gid = make_kgid(current_user_ns(), result.uint_32); + if (!gid_valid(gid)) { + ext4_msg(NULL, KERN_ERR, "Invalid gid value %d", + result.uint_32); + return -EINVAL; + } + ctx->s_resgid = gid; + ctx->spec |= EXT4_SPEC_s_resgid; + return 0; + case Opt_journal_dev: + if (is_remount) { + ext4_msg(NULL, KERN_ERR, + "Cannot specify journal on remount"); + return -EINVAL; + } + ctx->journal_devnum = result.uint_32; + ctx->spec |= EXT4_SPEC_JOURNAL_DEV; + return 0; + case Opt_journal_path: + { + struct inode *journal_inode; + struct path path; + int error; + + if (is_remount) { + ext4_msg(NULL, KERN_ERR, + "Cannot specify journal on remount"); + return -EINVAL; + } + + error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path); + if (error) { + ext4_msg(NULL, KERN_ERR, "error: could not find " + "journal device path"); + return -EINVAL; + } + + journal_inode = d_inode(path.dentry); + ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev); + ctx->spec |= EXT4_SPEC_JOURNAL_DEV; + path_put(&path); + return 0; + } + case Opt_journal_ioprio: + if (result.uint_32 > 7) { + ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority" + " (must be 0-7)"); + return -EINVAL; + } + ctx->journal_ioprio = + IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32); + ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO; + return 0; + case Opt_test_dummy_encryption: + return ext4_parse_test_dummy_encryption(param, ctx); + case Opt_dax: + case Opt_dax_type: +#ifdef CONFIG_FS_DAX + { + int type = (token == Opt_dax) ? + Opt_dax : result.uint_32; + + switch (type) { + case Opt_dax: + case Opt_dax_always: + ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); + ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); + break; + case Opt_dax_never: + ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); + ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); + break; + case Opt_dax_inode: + ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS); + ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER); + /* Strictly for printing options */ + ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE); + break; + } + return 0; + } +#else + ext4_msg(NULL, KERN_INFO, "dax option not supported"); + return -EINVAL; +#endif + case Opt_data_err: + if (result.uint_32 == Opt_data_err_abort) + ctx_set_mount_opt(ctx, m->mount_opt); + else if (result.uint_32 == Opt_data_err_ignore) + ctx_clear_mount_opt(ctx, m->mount_opt); + return 0; + case Opt_mb_optimize_scan: + if (result.int_32 == 1) { + ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN); + ctx->spec |= EXT4_SPEC_mb_optimize_scan; + } else if (result.int_32 == 0) { + ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN); + ctx->spec |= EXT4_SPEC_mb_optimize_scan; + } else { + ext4_msg(NULL, KERN_WARNING, + "mb_optimize_scan should be set to 0 or 1."); + return -EINVAL; + } + return 0; + } + + /* + * At this point we should only be getting options requiring MOPT_SET, + * or MOPT_CLEAR. Anything else is a bug + */ + if (m->token == Opt_err) { + ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s", + param->key); + WARN_ON(1); + return -EINVAL; + } + + else { + unsigned int set = 0; + + if ((param->type == fs_value_is_flag) || + result.uint_32 > 0) + set = 1; + + if (m->flags & MOPT_CLEAR) + set = !set; + else if (unlikely(!(m->flags & MOPT_SET))) { + ext4_msg(NULL, KERN_WARNING, + "buggy handling of option %s", + param->key); + WARN_ON(1); + return -EINVAL; + } + if (m->flags & MOPT_2) { + if (set != 0) + ctx_set_mount_opt2(ctx, m->mount_opt); + else + ctx_clear_mount_opt2(ctx, m->mount_opt); + } else { + if (set != 0) + ctx_set_mount_opt(ctx, m->mount_opt); + else + ctx_clear_mount_opt(ctx, m->mount_opt); + } + } + + return 0; +} + +static int parse_options(struct fs_context *fc, char *options) +{ + struct fs_parameter param; + int ret; + char *key; + + if (!options) + return 0; + + while ((key = strsep(&options, ",")) != NULL) { + if (*key) { + size_t v_len = 0; + char *value = strchr(key, '='); + + param.type = fs_value_is_flag; + param.string = NULL; + + if (value) { + if (value == key) + continue; + + *value++ = 0; + v_len = strlen(value); + param.string = kmemdup_nul(value, v_len, + GFP_KERNEL); + if (!param.string) + return -ENOMEM; + param.type = fs_value_is_string; + } + + param.key = key; + param.size = v_len; + + ret = ext4_parse_param(fc, ¶m); + if (param.string) + kfree(param.string); + if (ret < 0) + return ret; + } + } + + ret = ext4_validate_options(fc); + if (ret < 0) + return ret; + + return 0; +} + +static int parse_apply_sb_mount_options(struct super_block *sb, + struct ext4_fs_context *m_ctx) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *s_mount_opts = NULL; + struct ext4_fs_context *s_ctx = NULL; + struct fs_context *fc = NULL; + int ret = -ENOMEM; + + if (!sbi->s_es->s_mount_opts[0]) + return 0; + + s_mount_opts = kstrndup(sbi->s_es->s_mount_opts, + sizeof(sbi->s_es->s_mount_opts), + GFP_KERNEL); + if (!s_mount_opts) + return ret; + + fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL); + if (!fc) + goto out_free; + + s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL); + if (!s_ctx) + goto out_free; + + fc->fs_private = s_ctx; + fc->s_fs_info = sbi; + + ret = parse_options(fc, s_mount_opts); + if (ret < 0) + goto parse_failed; + + ret = ext4_check_opt_consistency(fc, sb); + if (ret < 0) { +parse_failed: + ext4_msg(sb, KERN_WARNING, + "failed to parse options in superblock: %s", + s_mount_opts); + ret = 0; + goto out_free; + } + + if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV) + m_ctx->journal_devnum = s_ctx->journal_devnum; + if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO) + m_ctx->journal_ioprio = s_ctx->journal_ioprio; + + ext4_apply_options(fc, sb); + ret = 0; + +out_free: + if (fc) { + ext4_fc_free(fc); + kfree(fc); + } + kfree(s_mount_opts); + return ret; +} + +static void ext4_apply_quota_options(struct fs_context *fc, + struct super_block *sb) +{ +#ifdef CONFIG_QUOTA + bool quota_feature = ext4_has_feature_quota(sb); + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *qname; + int i; + + if (quota_feature) + return; + + if (ctx->spec & EXT4_SPEC_JQUOTA) { + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (!(ctx->qname_spec & (1 << i))) + continue; + + qname = ctx->s_qf_names[i]; /* May be NULL */ + if (qname) + set_opt(sb, QUOTA); + ctx->s_qf_names[i] = NULL; + qname = rcu_replace_pointer(sbi->s_qf_names[i], qname, + lockdep_is_held(&sb->s_umount)); + if (qname) + kfree_rcu_mightsleep(qname); + } + } + + if (ctx->spec & EXT4_SPEC_JQFMT) + sbi->s_jquota_fmt = ctx->s_jquota_fmt; +#endif +} + +/* + * Check quota settings consistency. + */ +static int ext4_check_quota_consistency(struct fs_context *fc, + struct super_block *sb) +{ +#ifdef CONFIG_QUOTA + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + bool quota_feature = ext4_has_feature_quota(sb); + bool quota_loaded = sb_any_quota_loaded(sb); + bool usr_qf_name, grp_qf_name, usrquota, grpquota; + int quota_flags, i; + + /* + * We do the test below only for project quotas. 'usrquota' and + * 'grpquota' mount options are allowed even without quota feature + * to support legacy quotas in quota files. + */ + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) && + !ext4_has_feature_project(sb)) { + ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. " + "Cannot enable project quota enforcement."); + return -EINVAL; + } + + quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | + EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA; + if (quota_loaded && + ctx->mask_s_mount_opt & quota_flags && + !ctx_test_mount_opt(ctx, quota_flags)) + goto err_quota_change; + + if (ctx->spec & EXT4_SPEC_JQUOTA) { + + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (!(ctx->qname_spec & (1 << i))) + continue; + + if (quota_loaded && + !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i]) + goto err_jquota_change; + + if (sbi->s_qf_names[i] && ctx->s_qf_names[i] && + strcmp(get_qf_name(sb, sbi, i), + ctx->s_qf_names[i]) != 0) + goto err_jquota_specified; + } + + if (quota_feature) { + ext4_msg(NULL, KERN_INFO, + "Journaled quota options ignored when " + "QUOTA feature is enabled"); + return 0; + } + } + + if (ctx->spec & EXT4_SPEC_JQFMT) { + if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded) + goto err_jquota_change; + if (quota_feature) { + ext4_msg(NULL, KERN_INFO, "Quota format mount options " + "ignored when QUOTA feature is enabled"); + return 0; + } + } + + /* Make sure we don't mix old and new quota format */ + usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) || + ctx->s_qf_names[USRQUOTA]); + grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) || + ctx->s_qf_names[GRPQUOTA]); + + usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) || + test_opt(sb, USRQUOTA)); + + grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) || + test_opt(sb, GRPQUOTA)); + + if (usr_qf_name) { + ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA); + usrquota = false; + } + if (grp_qf_name) { + ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA); + grpquota = false; + } + + if (usr_qf_name || grp_qf_name) { + if (usrquota || grpquota) { + ext4_msg(NULL, KERN_ERR, "old and new quota " + "format mixing"); + return -EINVAL; + } + + if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) { + ext4_msg(NULL, KERN_ERR, "journaled quota format " + "not specified"); + return -EINVAL; + } + } + + return 0; + +err_quota_change: + ext4_msg(NULL, KERN_ERR, + "Cannot change quota options when quota turned on"); + return -EINVAL; +err_jquota_change: + ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota " + "options when quota turned on"); + return -EINVAL; +err_jquota_specified: + ext4_msg(NULL, KERN_ERR, "%s quota file already specified", + QTYPE2NAME(i)); + return -EINVAL; +#else + return 0; +#endif +} + +static int ext4_check_test_dummy_encryption(const struct fs_context *fc, + struct super_block *sb) +{ + const struct ext4_fs_context *ctx = fc->fs_private; + const struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy)) + return 0; + + if (!ext4_has_feature_encrypt(sb)) { + ext4_msg(NULL, KERN_WARNING, + "test_dummy_encryption requires encrypt feature"); + return -EINVAL; + } + /* + * This mount option is just for testing, and it's not worthwhile to + * implement the extra complexity (e.g. RCU protection) that would be + * needed to allow it to be set or changed during remount. We do allow + * it to be specified during remount, but only if there is no change. + */ + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { + if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy, + &ctx->dummy_enc_policy)) + return 0; + ext4_msg(NULL, KERN_WARNING, + "Can't set or change test_dummy_encryption on remount"); + return -EINVAL; + } + /* Also make sure s_mount_opts didn't contain a conflicting value. */ + if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) { + if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy, + &ctx->dummy_enc_policy)) + return 0; + ext4_msg(NULL, KERN_WARNING, + "Conflicting test_dummy_encryption options"); + return -EINVAL; + } + return 0; +} + +static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx, + struct super_block *sb) +{ + if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) || + /* if already set, it was already verified to be the same */ + fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy)) + return; + EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy; + memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy)); + ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled"); +} + +static int ext4_check_opt_consistency(struct fs_context *fc, + struct super_block *sb) +{ + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = fc->s_fs_info; + int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE; + int err; + + if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { + ext4_msg(NULL, KERN_ERR, + "Mount option(s) incompatible with ext2"); + return -EINVAL; + } + if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { + ext4_msg(NULL, KERN_ERR, + "Mount option(s) incompatible with ext3"); + return -EINVAL; + } + + if (ctx->s_want_extra_isize > + (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) { + ext4_msg(NULL, KERN_ERR, + "Invalid want_extra_isize %d", + ctx->s_want_extra_isize); + return -EINVAL; + } + + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DIOREAD_NOLOCK)) { + int blocksize = + BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); + if (blocksize < PAGE_SIZE) + ext4_msg(NULL, KERN_WARNING, "Warning: mounting with an " + "experimental mount option 'dioread_nolock' " + "for blocksize < PAGE_SIZE"); + } + + err = ext4_check_test_dummy_encryption(fc, sb); + if (err) + return err; + + if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) { + if (!sbi->s_journal) { + ext4_msg(NULL, KERN_WARNING, + "Remounting file system with no journal " + "so ignoring journalled data option"); + ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS); + } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) != + test_opt(sb, DATA_FLAGS)) { + ext4_msg(NULL, KERN_ERR, "Cannot change data mode " + "on remount"); + return -EINVAL; + } + } + + if (is_remount) { + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) && + (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { + ext4_msg(NULL, KERN_ERR, "can't mount with " + "both data=journal and dax"); + return -EINVAL; + } + + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) && + (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) || + (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) { +fail_dax_change_remount: + ext4_msg(NULL, KERN_ERR, "can't change " + "dax mount option while remounting"); + return -EINVAL; + } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) && + (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) || + (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) { + goto fail_dax_change_remount; + } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) && + ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) || + (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) || + !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) { + goto fail_dax_change_remount; + } + } + + return ext4_check_quota_consistency(fc, sb); +} + +static void ext4_apply_options(struct fs_context *fc, struct super_block *sb) +{ + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = fc->s_fs_info; + + sbi->s_mount_opt &= ~ctx->mask_s_mount_opt; + sbi->s_mount_opt |= ctx->vals_s_mount_opt; + sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2; + sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2; + sb->s_flags &= ~ctx->mask_s_flags; + sb->s_flags |= ctx->vals_s_flags; + +#define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; }) + APPLY(s_commit_interval); + APPLY(s_stripe); + APPLY(s_max_batch_time); + APPLY(s_min_batch_time); + APPLY(s_want_extra_isize); + APPLY(s_inode_readahead_blks); + APPLY(s_max_dir_size_kb); + APPLY(s_li_wait_mult); + APPLY(s_resgid); + APPLY(s_resuid); + +#ifdef CONFIG_EXT4_DEBUG + APPLY(s_fc_debug_max_replay); +#endif + + ext4_apply_quota_options(fc, sb); + ext4_apply_test_dummy_encryption(ctx, sb); +} + + +static int ext4_validate_options(struct fs_context *fc) +{ +#ifdef CONFIG_QUOTA + struct ext4_fs_context *ctx = fc->fs_private; + char *usr_qf_name, *grp_qf_name; + + usr_qf_name = ctx->s_qf_names[USRQUOTA]; + grp_qf_name = ctx->s_qf_names[GRPQUOTA]; + + if (usr_qf_name || grp_qf_name) { + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name) + ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA); + + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name) + ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA); + + if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) || + ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) { + ext4_msg(NULL, KERN_ERR, "old and new quota " + "format mixing"); + return -EINVAL; + } + } +#endif + return 1; +} + +static inline void ext4_show_quota_options(struct seq_file *seq, + struct super_block *sb) +{ +#if defined(CONFIG_QUOTA) + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *usr_qf_name, *grp_qf_name; + + if (sbi->s_jquota_fmt) { + char *fmtname = ""; + + switch (sbi->s_jquota_fmt) { + case QFMT_VFS_OLD: + fmtname = "vfsold"; + break; + case QFMT_VFS_V0: + fmtname = "vfsv0"; + break; + case QFMT_VFS_V1: + fmtname = "vfsv1"; + break; + } + seq_printf(seq, ",jqfmt=%s", fmtname); + } + + rcu_read_lock(); + usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]); + grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]); + if (usr_qf_name) + seq_show_option(seq, "usrjquota", usr_qf_name); + if (grp_qf_name) + seq_show_option(seq, "grpjquota", grp_qf_name); + rcu_read_unlock(); +#endif +} + +static const char *token2str(int token) +{ + const struct fs_parameter_spec *spec; + + for (spec = ext4_param_specs; spec->name != NULL; spec++) + if (spec->opt == token && !spec->type) + break; + return spec->name; +} + +/* + * Show an option if + * - it's set to a non-default value OR + * - if the per-sb default is different from the global default + */ +static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, + int nodefs) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int def_errors; + const struct mount_opts *m; + char sep = nodefs ? '\n' : ','; + +#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) +#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) + + if (sbi->s_sb_block != 1) + SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); + + for (m = ext4_mount_opts; m->token != Opt_err; m++) { + int want_set = m->flags & MOPT_SET; + int opt_2 = m->flags & MOPT_2; + unsigned int mount_opt, def_mount_opt; + + if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || + m->flags & MOPT_SKIP) + continue; + + if (opt_2) { + mount_opt = sbi->s_mount_opt2; + def_mount_opt = sbi->s_def_mount_opt2; + } else { + mount_opt = sbi->s_mount_opt; + def_mount_opt = sbi->s_def_mount_opt; + } + /* skip if same as the default */ + if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt))) + continue; + /* select Opt_noFoo vs Opt_Foo */ + if ((want_set && + (mount_opt & m->mount_opt) != m->mount_opt) || + (!want_set && (mount_opt & m->mount_opt))) + continue; + SEQ_OPTS_PRINT("%s", token2str(m->token)); + } + + if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || + le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) + SEQ_OPTS_PRINT("resuid=%u", + from_kuid_munged(&init_user_ns, sbi->s_resuid)); + if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || + le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) + SEQ_OPTS_PRINT("resgid=%u", + from_kgid_munged(&init_user_ns, sbi->s_resgid)); + def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); + if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) + SEQ_OPTS_PUTS("errors=remount-ro"); + if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) + SEQ_OPTS_PUTS("errors=continue"); + if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) + SEQ_OPTS_PUTS("errors=panic"); + if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) + SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); + if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) + SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); + if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) + SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); + if (nodefs || sbi->s_stripe) + SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); + if (nodefs || EXT4_MOUNT_DATA_FLAGS & + (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) + SEQ_OPTS_PUTS("data=journal"); + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) + SEQ_OPTS_PUTS("data=ordered"); + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) + SEQ_OPTS_PUTS("data=writeback"); + } + if (nodefs || + sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) + SEQ_OPTS_PRINT("inode_readahead_blks=%u", + sbi->s_inode_readahead_blks); + + if (test_opt(sb, INIT_INODE_TABLE) && (nodefs || + (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) + SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); + if (nodefs || sbi->s_max_dir_size_kb) + SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); + if (test_opt(sb, DATA_ERR_ABORT)) + SEQ_OPTS_PUTS("data_err=abort"); + + fscrypt_show_test_dummy_encryption(seq, sep, sb); + + if (sb->s_flags & SB_INLINECRYPT) + SEQ_OPTS_PUTS("inlinecrypt"); + + if (test_opt(sb, DAX_ALWAYS)) { + if (IS_EXT2_SB(sb)) + SEQ_OPTS_PUTS("dax"); + else + SEQ_OPTS_PUTS("dax=always"); + } else if (test_opt2(sb, DAX_NEVER)) { + SEQ_OPTS_PUTS("dax=never"); + } else if (test_opt2(sb, DAX_INODE)) { + SEQ_OPTS_PUTS("dax=inode"); + } + + if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD && + !test_opt2(sb, MB_OPTIMIZE_SCAN)) { + SEQ_OPTS_PUTS("mb_optimize_scan=0"); + } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD && + test_opt2(sb, MB_OPTIMIZE_SCAN)) { + SEQ_OPTS_PUTS("mb_optimize_scan=1"); + } + + ext4_show_quota_options(seq, sb); + return 0; +} + +static int ext4_show_options(struct seq_file *seq, struct dentry *root) +{ + return _ext4_show_options(seq, root->d_sb, 0); +} + +int ext4_seq_options_show(struct seq_file *seq, void *offset) +{ + struct super_block *sb = seq->private; + int rc; + + seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw"); + rc = _ext4_show_options(seq, sb, 1); + seq_puts(seq, "\n"); + return rc; +} + +static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, + int read_only) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + int err = 0; + + if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { + ext4_msg(sb, KERN_ERR, "revision level too high, " + "forcing read-only mode"); + err = -EROFS; + goto done; + } + if (read_only) + goto done; + if (!(sbi->s_mount_state & EXT4_VALID_FS)) + ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " + "running e2fsck is recommended"); + else if (sbi->s_mount_state & EXT4_ERROR_FS) + ext4_msg(sb, KERN_WARNING, + "warning: mounting fs with errors, " + "running e2fsck is recommended"); + else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && + le16_to_cpu(es->s_mnt_count) >= + (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) + ext4_msg(sb, KERN_WARNING, + "warning: maximal mount count reached, " + "running e2fsck is recommended"); + else if (le32_to_cpu(es->s_checkinterval) && + (ext4_get_tstamp(es, s_lastcheck) + + le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds())) + ext4_msg(sb, KERN_WARNING, + "warning: checktime reached, " + "running e2fsck is recommended"); + if (!sbi->s_journal) + es->s_state &= cpu_to_le16(~EXT4_VALID_FS); + if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) + es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); + le16_add_cpu(&es->s_mnt_count, 1); + ext4_update_tstamp(es, s_mtime); + if (sbi->s_journal) { + ext4_set_feature_journal_needs_recovery(sb); + if (ext4_has_feature_orphan_file(sb)) + ext4_set_feature_orphan_present(sb); + } + + err = ext4_commit_super(sb); +done: + if (test_opt(sb, DEBUG)) + printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " + "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", + sb->s_blocksize, + sbi->s_groups_count, + EXT4_BLOCKS_PER_GROUP(sb), + EXT4_INODES_PER_GROUP(sb), + sbi->s_mount_opt, sbi->s_mount_opt2); + return err; +} + +int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct flex_groups **old_groups, **new_groups; + int size, i, j; + + if (!sbi->s_log_groups_per_flex) + return 0; + + size = ext4_flex_group(sbi, ngroup - 1) + 1; + if (size <= sbi->s_flex_groups_allocated) + return 0; + + new_groups = kvzalloc(roundup_pow_of_two(size * + sizeof(*sbi->s_flex_groups)), GFP_KERNEL); + if (!new_groups) { + ext4_msg(sb, KERN_ERR, + "not enough memory for %d flex group pointers", size); + return -ENOMEM; + } + for (i = sbi->s_flex_groups_allocated; i < size; i++) { + new_groups[i] = kvzalloc(roundup_pow_of_two( + sizeof(struct flex_groups)), + GFP_KERNEL); + if (!new_groups[i]) { + for (j = sbi->s_flex_groups_allocated; j < i; j++) + kvfree(new_groups[j]); + kvfree(new_groups); + ext4_msg(sb, KERN_ERR, + "not enough memory for %d flex groups", size); + return -ENOMEM; + } + } + rcu_read_lock(); + old_groups = rcu_dereference(sbi->s_flex_groups); + if (old_groups) + memcpy(new_groups, old_groups, + (sbi->s_flex_groups_allocated * + sizeof(struct flex_groups *))); + rcu_read_unlock(); + rcu_assign_pointer(sbi->s_flex_groups, new_groups); + sbi->s_flex_groups_allocated = size; + if (old_groups) + ext4_kvfree_array_rcu(old_groups); + return 0; +} + +static int ext4_fill_flex_info(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_desc *gdp = NULL; + struct flex_groups *fg; + ext4_group_t flex_group; + int i, err; + + sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; + if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { + sbi->s_log_groups_per_flex = 0; + return 1; + } + + err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); + if (err) + goto failed; + + for (i = 0; i < sbi->s_groups_count; i++) { + gdp = ext4_get_group_desc(sb, i, NULL); + + flex_group = ext4_flex_group(sbi, i); + fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); + atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes); + atomic64_add(ext4_free_group_clusters(sb, gdp), + &fg->free_clusters); + atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs); + } + + return 1; +failed: + return 0; +} + +static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group, + struct ext4_group_desc *gdp) +{ + int offset = offsetof(struct ext4_group_desc, bg_checksum); + __u16 crc = 0; + __le32 le_group = cpu_to_le32(block_group); + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (ext4_has_metadata_csum(sbi->s_sb)) { + /* Use new metadata_csum algorithm */ + __u32 csum32; + __u16 dummy_csum = 0; + + csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, + sizeof(le_group)); + csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset); + csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum, + sizeof(dummy_csum)); + offset += sizeof(dummy_csum); + if (offset < sbi->s_desc_size) + csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset, + sbi->s_desc_size - offset); + + crc = csum32 & 0xFFFF; + goto out; + } + + /* old crc16 code */ + if (!ext4_has_feature_gdt_csum(sb)) + return 0; + + crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); + crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); + crc = crc16(crc, (__u8 *)gdp, offset); + offset += sizeof(gdp->bg_checksum); /* skip checksum */ + /* for checksum of struct ext4_group_desc do the rest...*/ + if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size) + crc = crc16(crc, (__u8 *)gdp + offset, + sbi->s_desc_size - offset); + +out: + return cpu_to_le16(crc); +} + +int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, + struct ext4_group_desc *gdp) +{ + if (ext4_has_group_desc_csum(sb) && + (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp))) + return 0; + + return 1; +} + +void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, + struct ext4_group_desc *gdp) +{ + if (!ext4_has_group_desc_csum(sb)) + return; + gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp); +} + +/* Called at mount-time, super-block is locked */ +static int ext4_check_descriptors(struct super_block *sb, + ext4_fsblk_t sb_block, + ext4_group_t *first_not_zeroed) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); + ext4_fsblk_t last_block; + ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0); + ext4_fsblk_t block_bitmap; + ext4_fsblk_t inode_bitmap; + ext4_fsblk_t inode_table; + int flexbg_flag = 0; + ext4_group_t i, grp = sbi->s_groups_count; + + if (ext4_has_feature_flex_bg(sb)) + flexbg_flag = 1; + + ext4_debug("Checking group descriptors"); + + for (i = 0; i < sbi->s_groups_count; i++) { + struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); + + if (i == sbi->s_groups_count - 1 || flexbg_flag) + last_block = ext4_blocks_count(sbi->s_es) - 1; + else + last_block = first_block + + (EXT4_BLOCKS_PER_GROUP(sb) - 1); + + if ((grp == sbi->s_groups_count) && + !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + grp = i; + + block_bitmap = ext4_block_bitmap(sb, gdp); + if (block_bitmap == sb_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Block bitmap for group %u overlaps " + "superblock", i); + if (!sb_rdonly(sb)) + return 0; + } + if (block_bitmap >= sb_block + 1 && + block_bitmap <= last_bg_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Block bitmap for group %u overlaps " + "block group descriptors", i); + if (!sb_rdonly(sb)) + return 0; + } + if (block_bitmap < first_block || block_bitmap > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Block bitmap for group %u not in group " + "(block %llu)!", i, block_bitmap); + return 0; + } + inode_bitmap = ext4_inode_bitmap(sb, gdp); + if (inode_bitmap == sb_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode bitmap for group %u overlaps " + "superblock", i); + if (!sb_rdonly(sb)) + return 0; + } + if (inode_bitmap >= sb_block + 1 && + inode_bitmap <= last_bg_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode bitmap for group %u overlaps " + "block group descriptors", i); + if (!sb_rdonly(sb)) + return 0; + } + if (inode_bitmap < first_block || inode_bitmap > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode bitmap for group %u not in group " + "(block %llu)!", i, inode_bitmap); + return 0; + } + inode_table = ext4_inode_table(sb, gdp); + if (inode_table == sb_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode table for group %u overlaps " + "superblock", i); + if (!sb_rdonly(sb)) + return 0; + } + if (inode_table >= sb_block + 1 && + inode_table <= last_bg_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode table for group %u overlaps " + "block group descriptors", i); + if (!sb_rdonly(sb)) + return 0; + } + if (inode_table < first_block || + inode_table + sbi->s_itb_per_group - 1 > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode table for group %u not in group " + "(block %llu)!", i, inode_table); + return 0; + } + ext4_lock_group(sb, i); + if (!ext4_group_desc_csum_verify(sb, i, gdp)) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Checksum for group %u failed (%u!=%u)", + i, le16_to_cpu(ext4_group_desc_csum(sb, i, + gdp)), le16_to_cpu(gdp->bg_checksum)); + if (!sb_rdonly(sb)) { + ext4_unlock_group(sb, i); + return 0; + } + } + ext4_unlock_group(sb, i); + if (!flexbg_flag) + first_block += EXT4_BLOCKS_PER_GROUP(sb); + } + if (NULL != first_not_zeroed) + *first_not_zeroed = grp; + return 1; +} + +/* + * Maximal extent format file size. + * Resulting logical blkno at s_maxbytes must fit in our on-disk + * extent format containers, within a sector_t, and within i_blocks + * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, + * so that won't be a limiting factor. + * + * However there is other limiting factor. We do store extents in the form + * of starting block and length, hence the resulting length of the extent + * covering maximum file size must fit into on-disk format containers as + * well. Given that length is always by 1 unit bigger than max unit (because + * we count 0 as well) we have to lower the s_maxbytes by one fs block. + * + * Note, this does *not* consider any metadata overhead for vfs i_blocks. + */ +static loff_t ext4_max_size(int blkbits, int has_huge_files) +{ + loff_t res; + loff_t upper_limit = MAX_LFS_FILESIZE; + + BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64)); + + if (!has_huge_files) { + upper_limit = (1LL << 32) - 1; + + /* total blocks in file system block size */ + upper_limit >>= (blkbits - 9); + upper_limit <<= blkbits; + } + + /* + * 32-bit extent-start container, ee_block. We lower the maxbytes + * by one fs block, so ee_len can cover the extent of maximum file + * size + */ + res = (1LL << 32) - 1; + res <<= blkbits; + + /* Sanity check against vm- & vfs- imposed limits */ + if (res > upper_limit) + res = upper_limit; + + return res; +} + +/* + * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect + * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. + * We need to be 1 filesystem block less than the 2^48 sector limit. + */ +static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) +{ + loff_t upper_limit, res = EXT4_NDIR_BLOCKS; + int meta_blocks; + unsigned int ppb = 1 << (bits - 2); + + /* + * This is calculated to be the largest file size for a dense, block + * mapped file such that the file's total number of 512-byte sectors, + * including data and all indirect blocks, does not exceed (2^48 - 1). + * + * __u32 i_blocks_lo and _u16 i_blocks_high represent the total + * number of 512-byte sectors of the file. + */ + if (!has_huge_files) { + /* + * !has_huge_files or implies that the inode i_block field + * represents total file blocks in 2^32 512-byte sectors == + * size of vfs inode i_blocks * 8 + */ + upper_limit = (1LL << 32) - 1; + + /* total blocks in file system block size */ + upper_limit >>= (bits - 9); + + } else { + /* + * We use 48 bit ext4_inode i_blocks + * With EXT4_HUGE_FILE_FL set the i_blocks + * represent total number of blocks in + * file system block size + */ + upper_limit = (1LL << 48) - 1; + + } + + /* Compute how many blocks we can address by block tree */ + res += ppb; + res += ppb * ppb; + res += ((loff_t)ppb) * ppb * ppb; + /* Compute how many metadata blocks are needed */ + meta_blocks = 1; + meta_blocks += 1 + ppb; + meta_blocks += 1 + ppb + ppb * ppb; + /* Does block tree limit file size? */ + if (res + meta_blocks <= upper_limit) + goto check_lfs; + + res = upper_limit; + /* How many metadata blocks are needed for addressing upper_limit? */ + upper_limit -= EXT4_NDIR_BLOCKS; + /* indirect blocks */ + meta_blocks = 1; + upper_limit -= ppb; + /* double indirect blocks */ + if (upper_limit < ppb * ppb) { + meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb); + res -= meta_blocks; + goto check_lfs; + } + meta_blocks += 1 + ppb; + upper_limit -= ppb * ppb; + /* tripple indirect blocks for the rest */ + meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) + + DIV_ROUND_UP_ULL(upper_limit, ppb*ppb); + res -= meta_blocks; +check_lfs: + res <<= bits; + if (res > MAX_LFS_FILESIZE) + res = MAX_LFS_FILESIZE; + + return res; +} + +static ext4_fsblk_t descriptor_loc(struct super_block *sb, + ext4_fsblk_t logical_sb_block, int nr) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_group_t bg, first_meta_bg; + int has_super = 0; + + first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); + + if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg) + return logical_sb_block + nr + 1; + bg = sbi->s_desc_per_block * nr; + if (ext4_bg_has_super(sb, bg)) + has_super = 1; + + /* + * If we have a meta_bg fs with 1k blocks, group 0's GDT is at + * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled + * on modern mke2fs or blksize > 1k on older mke2fs) then we must + * compensate. + */ + if (sb->s_blocksize == 1024 && nr == 0 && + le32_to_cpu(sbi->s_es->s_first_data_block) == 0) + has_super++; + + return (has_super + ext4_group_first_block_no(sb, bg)); +} + +/** + * ext4_get_stripe_size: Get the stripe size. + * @sbi: In memory super block info + * + * If we have specified it via mount option, then + * use the mount option value. If the value specified at mount time is + * greater than the blocks per group use the super block value. + * If the super block value is greater than blocks per group return 0. + * Allocator needs it be less than blocks per group. + * + */ +static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) +{ + unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); + unsigned long stripe_width = + le32_to_cpu(sbi->s_es->s_raid_stripe_width); + int ret; + + if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) + ret = sbi->s_stripe; + else if (stripe_width && stripe_width <= sbi->s_blocks_per_group) + ret = stripe_width; + else if (stride && stride <= sbi->s_blocks_per_group) + ret = stride; + else + ret = 0; + + /* + * If the stripe width is 1, this makes no sense and + * we set it to 0 to turn off stripe handling code. + */ + if (ret <= 1) + ret = 0; + + return ret; +} + +/* + * Check whether this filesystem can be mounted based on + * the features present and the RDONLY/RDWR mount requested. + * Returns 1 if this filesystem can be mounted as requested, + * 0 if it cannot be. + */ +int ext4_feature_set_ok(struct super_block *sb, int readonly) +{ + if (ext4_has_unknown_ext4_incompat_features(sb)) { + ext4_msg(sb, KERN_ERR, + "Couldn't mount because of " + "unsupported optional features (%x)", + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & + ~EXT4_FEATURE_INCOMPAT_SUPP)); + return 0; + } + +#if !IS_ENABLED(CONFIG_UNICODE) + if (ext4_has_feature_casefold(sb)) { + ext4_msg(sb, KERN_ERR, + "Filesystem with casefold feature cannot be " + "mounted without CONFIG_UNICODE"); + return 0; + } +#endif + + if (readonly) + return 1; + + if (ext4_has_feature_readonly(sb)) { + ext4_msg(sb, KERN_INFO, "filesystem is read-only"); + sb->s_flags |= SB_RDONLY; + return 1; + } + + /* Check that feature set is OK for a read-write mount */ + if (ext4_has_unknown_ext4_ro_compat_features(sb)) { + ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " + "unsupported optional features (%x)", + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & + ~EXT4_FEATURE_RO_COMPAT_SUPP)); + return 0; + } + if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) { + ext4_msg(sb, KERN_ERR, + "Can't support bigalloc feature without " + "extents feature\n"); + return 0; + } + +#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2) + if (!readonly && (ext4_has_feature_quota(sb) || + ext4_has_feature_project(sb))) { + ext4_msg(sb, KERN_ERR, + "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2"); + return 0; + } +#endif /* CONFIG_QUOTA */ + return 1; +} + +/* + * This function is called once a day if we have errors logged + * on the file system + */ +static void print_daily_error_info(struct timer_list *t) +{ + struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report); + struct super_block *sb = sbi->s_sb; + struct ext4_super_block *es = sbi->s_es; + + if (es->s_error_count) + /* fsck newer than v1.41.13 is needed to clean this condition. */ + ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", + le32_to_cpu(es->s_error_count)); + if (es->s_first_error_time) { + printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d", + sb->s_id, + ext4_get_tstamp(es, s_first_error_time), + (int) sizeof(es->s_first_error_func), + es->s_first_error_func, + le32_to_cpu(es->s_first_error_line)); + if (es->s_first_error_ino) + printk(KERN_CONT ": inode %u", + le32_to_cpu(es->s_first_error_ino)); + if (es->s_first_error_block) + printk(KERN_CONT ": block %llu", (unsigned long long) + le64_to_cpu(es->s_first_error_block)); + printk(KERN_CONT "\n"); + } + if (es->s_last_error_time) { + printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d", + sb->s_id, + ext4_get_tstamp(es, s_last_error_time), + (int) sizeof(es->s_last_error_func), + es->s_last_error_func, + le32_to_cpu(es->s_last_error_line)); + if (es->s_last_error_ino) + printk(KERN_CONT ": inode %u", + le32_to_cpu(es->s_last_error_ino)); + if (es->s_last_error_block) + printk(KERN_CONT ": block %llu", (unsigned long long) + le64_to_cpu(es->s_last_error_block)); + printk(KERN_CONT "\n"); + } + mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ +} + +/* Find next suitable group and run ext4_init_inode_table */ +static int ext4_run_li_request(struct ext4_li_request *elr) +{ + struct ext4_group_desc *gdp = NULL; + struct super_block *sb = elr->lr_super; + ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; + ext4_group_t group = elr->lr_next_group; + unsigned int prefetch_ios = 0; + int ret = 0; + int nr = EXT4_SB(sb)->s_mb_prefetch; + u64 start_time; + + if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) { + elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios); + ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr); + trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr); + if (group >= elr->lr_next_group) { + ret = 1; + if (elr->lr_first_not_zeroed != ngroups && + !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) { + elr->lr_next_group = elr->lr_first_not_zeroed; + elr->lr_mode = EXT4_LI_MODE_ITABLE; + ret = 0; + } + } + return ret; + } + + for (; group < ngroups; group++) { + gdp = ext4_get_group_desc(sb, group, NULL); + if (!gdp) { + ret = 1; + break; + } + + if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + break; + } + + if (group >= ngroups) + ret = 1; + + if (!ret) { + start_time = ktime_get_real_ns(); + ret = ext4_init_inode_table(sb, group, + elr->lr_timeout ? 0 : 1); + trace_ext4_lazy_itable_init(sb, group); + if (elr->lr_timeout == 0) { + elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) * + EXT4_SB(elr->lr_super)->s_li_wait_mult); + } + elr->lr_next_sched = jiffies + elr->lr_timeout; + elr->lr_next_group = group + 1; + } + return ret; +} + +/* + * Remove lr_request from the list_request and free the + * request structure. Should be called with li_list_mtx held + */ +static void ext4_remove_li_request(struct ext4_li_request *elr) +{ + if (!elr) + return; + + list_del(&elr->lr_request); + EXT4_SB(elr->lr_super)->s_li_request = NULL; + kfree(elr); +} + +static void ext4_unregister_li_request(struct super_block *sb) +{ + mutex_lock(&ext4_li_mtx); + if (!ext4_li_info) { + mutex_unlock(&ext4_li_mtx); + return; + } + + mutex_lock(&ext4_li_info->li_list_mtx); + ext4_remove_li_request(EXT4_SB(sb)->s_li_request); + mutex_unlock(&ext4_li_info->li_list_mtx); + mutex_unlock(&ext4_li_mtx); +} + +static struct task_struct *ext4_lazyinit_task; + +/* + * This is the function where ext4lazyinit thread lives. It walks + * through the request list searching for next scheduled filesystem. + * When such a fs is found, run the lazy initialization request + * (ext4_rn_li_request) and keep track of the time spend in this + * function. Based on that time we compute next schedule time of + * the request. When walking through the list is complete, compute + * next waking time and put itself into sleep. + */ +static int ext4_lazyinit_thread(void *arg) +{ + struct ext4_lazy_init *eli = arg; + struct list_head *pos, *n; + struct ext4_li_request *elr; + unsigned long next_wakeup, cur; + + BUG_ON(NULL == eli); + set_freezable(); + +cont_thread: + while (true) { + next_wakeup = MAX_JIFFY_OFFSET; + + mutex_lock(&eli->li_list_mtx); + if (list_empty(&eli->li_request_list)) { + mutex_unlock(&eli->li_list_mtx); + goto exit_thread; + } + list_for_each_safe(pos, n, &eli->li_request_list) { + int err = 0; + int progress = 0; + elr = list_entry(pos, struct ext4_li_request, + lr_request); + + if (time_before(jiffies, elr->lr_next_sched)) { + if (time_before(elr->lr_next_sched, next_wakeup)) + next_wakeup = elr->lr_next_sched; + continue; + } + if (down_read_trylock(&elr->lr_super->s_umount)) { + if (sb_start_write_trylock(elr->lr_super)) { + progress = 1; + /* + * We hold sb->s_umount, sb can not + * be removed from the list, it is + * now safe to drop li_list_mtx + */ + mutex_unlock(&eli->li_list_mtx); + err = ext4_run_li_request(elr); + sb_end_write(elr->lr_super); + mutex_lock(&eli->li_list_mtx); + n = pos->next; + } + up_read((&elr->lr_super->s_umount)); + } + /* error, remove the lazy_init job */ + if (err) { + ext4_remove_li_request(elr); + continue; + } + if (!progress) { + elr->lr_next_sched = jiffies + + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ); + } + if (time_before(elr->lr_next_sched, next_wakeup)) + next_wakeup = elr->lr_next_sched; + } + mutex_unlock(&eli->li_list_mtx); + + try_to_freeze(); + + cur = jiffies; + if ((time_after_eq(cur, next_wakeup)) || + (MAX_JIFFY_OFFSET == next_wakeup)) { + cond_resched(); + continue; + } + + schedule_timeout_interruptible(next_wakeup - cur); + + if (kthread_should_stop()) { + ext4_clear_request_list(); + goto exit_thread; + } + } + +exit_thread: + /* + * It looks like the request list is empty, but we need + * to check it under the li_list_mtx lock, to prevent any + * additions into it, and of course we should lock ext4_li_mtx + * to atomically free the list and ext4_li_info, because at + * this point another ext4 filesystem could be registering + * new one. + */ + mutex_lock(&ext4_li_mtx); + mutex_lock(&eli->li_list_mtx); + if (!list_empty(&eli->li_request_list)) { + mutex_unlock(&eli->li_list_mtx); + mutex_unlock(&ext4_li_mtx); + goto cont_thread; + } + mutex_unlock(&eli->li_list_mtx); + kfree(ext4_li_info); + ext4_li_info = NULL; + mutex_unlock(&ext4_li_mtx); + + return 0; +} + +static void ext4_clear_request_list(void) +{ + struct list_head *pos, *n; + struct ext4_li_request *elr; + + mutex_lock(&ext4_li_info->li_list_mtx); + list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { + elr = list_entry(pos, struct ext4_li_request, + lr_request); + ext4_remove_li_request(elr); + } + mutex_unlock(&ext4_li_info->li_list_mtx); +} + +static int ext4_run_lazyinit_thread(void) +{ + ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, + ext4_li_info, "ext4lazyinit"); + if (IS_ERR(ext4_lazyinit_task)) { + int err = PTR_ERR(ext4_lazyinit_task); + ext4_clear_request_list(); + kfree(ext4_li_info); + ext4_li_info = NULL; + printk(KERN_CRIT "EXT4-fs: error %d creating inode table " + "initialization thread\n", + err); + return err; + } + ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; + return 0; +} + +/* + * Check whether it make sense to run itable init. thread or not. + * If there is at least one uninitialized inode table, return + * corresponding group number, else the loop goes through all + * groups and return total number of groups. + */ +static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) +{ + ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; + struct ext4_group_desc *gdp = NULL; + + if (!ext4_has_group_desc_csum(sb)) + return ngroups; + + for (group = 0; group < ngroups; group++) { + gdp = ext4_get_group_desc(sb, group, NULL); + if (!gdp) + continue; + + if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + break; + } + + return group; +} + +static int ext4_li_info_new(void) +{ + struct ext4_lazy_init *eli = NULL; + + eli = kzalloc(sizeof(*eli), GFP_KERNEL); + if (!eli) + return -ENOMEM; + + INIT_LIST_HEAD(&eli->li_request_list); + mutex_init(&eli->li_list_mtx); + + eli->li_state |= EXT4_LAZYINIT_QUIT; + + ext4_li_info = eli; + + return 0; +} + +static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, + ext4_group_t start) +{ + struct ext4_li_request *elr; + + elr = kzalloc(sizeof(*elr), GFP_KERNEL); + if (!elr) + return NULL; + + elr->lr_super = sb; + elr->lr_first_not_zeroed = start; + if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) { + elr->lr_mode = EXT4_LI_MODE_ITABLE; + elr->lr_next_group = start; + } else { + elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP; + } + + /* + * Randomize first schedule time of the request to + * spread the inode table initialization requests + * better. + */ + elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ); + return elr; +} + +int ext4_register_li_request(struct super_block *sb, + ext4_group_t first_not_zeroed) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_li_request *elr = NULL; + ext4_group_t ngroups = sbi->s_groups_count; + int ret = 0; + + mutex_lock(&ext4_li_mtx); + if (sbi->s_li_request != NULL) { + /* + * Reset timeout so it can be computed again, because + * s_li_wait_mult might have changed. + */ + sbi->s_li_request->lr_timeout = 0; + goto out; + } + + if (sb_rdonly(sb) || + (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) && + (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE)))) + goto out; + + elr = ext4_li_request_new(sb, first_not_zeroed); + if (!elr) { + ret = -ENOMEM; + goto out; + } + + if (NULL == ext4_li_info) { + ret = ext4_li_info_new(); + if (ret) + goto out; + } + + mutex_lock(&ext4_li_info->li_list_mtx); + list_add(&elr->lr_request, &ext4_li_info->li_request_list); + mutex_unlock(&ext4_li_info->li_list_mtx); + + sbi->s_li_request = elr; + /* + * set elr to NULL here since it has been inserted to + * the request_list and the removal and free of it is + * handled by ext4_clear_request_list from now on. + */ + elr = NULL; + + if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { + ret = ext4_run_lazyinit_thread(); + if (ret) + goto out; + } +out: + mutex_unlock(&ext4_li_mtx); + if (ret) + kfree(elr); + return ret; +} + +/* + * We do not need to lock anything since this is called on + * module unload. + */ +static void ext4_destroy_lazyinit_thread(void) +{ + /* + * If thread exited earlier + * there's nothing to be done. + */ + if (!ext4_li_info || !ext4_lazyinit_task) + return; + + kthread_stop(ext4_lazyinit_task); +} + +static int set_journal_csum_feature_set(struct super_block *sb) +{ + int ret = 1; + int compat, incompat; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (ext4_has_metadata_csum(sb)) { + /* journal checksum v3 */ + compat = 0; + incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; + } else { + /* journal checksum v1 */ + compat = JBD2_FEATURE_COMPAT_CHECKSUM; + incompat = 0; + } + + jbd2_journal_clear_features(sbi->s_journal, + JBD2_FEATURE_COMPAT_CHECKSUM, 0, + JBD2_FEATURE_INCOMPAT_CSUM_V3 | + JBD2_FEATURE_INCOMPAT_CSUM_V2); + if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ret = jbd2_journal_set_features(sbi->s_journal, + compat, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | + incompat); + } else if (test_opt(sb, JOURNAL_CHECKSUM)) { + ret = jbd2_journal_set_features(sbi->s_journal, + compat, 0, + incompat); + jbd2_journal_clear_features(sbi->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); + } else { + jbd2_journal_clear_features(sbi->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); + } + + return ret; +} + +/* + * Note: calculating the overhead so we can be compatible with + * historical BSD practice is quite difficult in the face of + * clusters/bigalloc. This is because multiple metadata blocks from + * different block group can end up in the same allocation cluster. + * Calculating the exact overhead in the face of clustered allocation + * requires either O(all block bitmaps) in memory or O(number of block + * groups**2) in time. We will still calculate the superblock for + * older file systems --- and if we come across with a bigalloc file + * system with zero in s_overhead_clusters the estimate will be close to + * correct especially for very large cluster sizes --- but for newer + * file systems, it's better to calculate this figure once at mkfs + * time, and store it in the superblock. If the superblock value is + * present (even for non-bigalloc file systems), we will use it. + */ +static int count_overhead(struct super_block *sb, ext4_group_t grp, + char *buf) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_desc *gdp; + ext4_fsblk_t first_block, last_block, b; + ext4_group_t i, ngroups = ext4_get_groups_count(sb); + int s, j, count = 0; + int has_super = ext4_bg_has_super(sb, grp); + + if (!ext4_has_feature_bigalloc(sb)) + return (has_super + ext4_bg_num_gdb(sb, grp) + + (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) + + sbi->s_itb_per_group + 2); + + first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + + (grp * EXT4_BLOCKS_PER_GROUP(sb)); + last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; + for (i = 0; i < ngroups; i++) { + gdp = ext4_get_group_desc(sb, i, NULL); + b = ext4_block_bitmap(sb, gdp); + if (b >= first_block && b <= last_block) { + ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); + count++; + } + b = ext4_inode_bitmap(sb, gdp); + if (b >= first_block && b <= last_block) { + ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); + count++; + } + b = ext4_inode_table(sb, gdp); + if (b >= first_block && b + sbi->s_itb_per_group <= last_block) + for (j = 0; j < sbi->s_itb_per_group; j++, b++) { + int c = EXT4_B2C(sbi, b - first_block); + ext4_set_bit(c, buf); + count++; + } + if (i != grp) + continue; + s = 0; + if (ext4_bg_has_super(sb, grp)) { + ext4_set_bit(s++, buf); + count++; + } + j = ext4_bg_num_gdb(sb, grp); + if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) { + ext4_error(sb, "Invalid number of block group " + "descriptor blocks: %d", j); + j = EXT4_BLOCKS_PER_GROUP(sb) - s; + } + count += j; + for (; j > 0; j--) + ext4_set_bit(EXT4_B2C(sbi, s++), buf); + } + if (!count) + return 0; + return EXT4_CLUSTERS_PER_GROUP(sb) - + ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); +} + +/* + * Compute the overhead and stash it in sbi->s_overhead + */ +int ext4_calculate_overhead(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + struct inode *j_inode; + unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum); + ext4_group_t i, ngroups = ext4_get_groups_count(sb); + ext4_fsblk_t overhead = 0; + char *buf = (char *) get_zeroed_page(GFP_NOFS); + + if (!buf) + return -ENOMEM; + + /* + * Compute the overhead (FS structures). This is constant + * for a given filesystem unless the number of block groups + * changes so we cache the previous value until it does. + */ + + /* + * All of the blocks before first_data_block are overhead + */ + overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); + + /* + * Add the overhead found in each block group + */ + for (i = 0; i < ngroups; i++) { + int blks; + + blks = count_overhead(sb, i, buf); + overhead += blks; + if (blks) + memset(buf, 0, PAGE_SIZE); + cond_resched(); + } + + /* + * Add the internal journal blocks whether the journal has been + * loaded or not + */ + if (sbi->s_journal && !sbi->s_journal_bdev) + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len); + else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) { + /* j_inum for internal journal is non-zero */ + j_inode = ext4_get_journal_inode(sb, j_inum); + if (!IS_ERR(j_inode)) { + j_blocks = j_inode->i_size >> sb->s_blocksize_bits; + overhead += EXT4_NUM_B2C(sbi, j_blocks); + iput(j_inode); + } else { + ext4_msg(sb, KERN_ERR, "can't get journal size"); + } + } + sbi->s_overhead = overhead; + smp_wmb(); + free_page((unsigned long) buf); + return 0; +} + +static void ext4_set_resv_clusters(struct super_block *sb) +{ + ext4_fsblk_t resv_clusters; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + /* + * There's no need to reserve anything when we aren't using extents. + * The space estimates are exact, there are no unwritten extents, + * hole punching doesn't need new metadata... This is needed especially + * to keep ext2/3 backward compatibility. + */ + if (!ext4_has_feature_extents(sb)) + return; + /* + * By default we reserve 2% or 4096 clusters, whichever is smaller. + * This should cover the situations where we can not afford to run + * out of space like for example punch hole, or converting + * unwritten extents in delalloc path. In most cases such + * allocation would require 1, or 2 blocks, higher numbers are + * very rare. + */ + resv_clusters = (ext4_blocks_count(sbi->s_es) >> + sbi->s_cluster_bits); + + do_div(resv_clusters, 50); + resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); + + atomic64_set(&sbi->s_resv_clusters, resv_clusters); +} + +static const char *ext4_quota_mode(struct super_block *sb) +{ +#ifdef CONFIG_QUOTA + if (!ext4_quota_capable(sb)) + return "none"; + + if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb)) + return "journalled"; + else + return "writeback"; +#else + return "disabled"; +#endif +} + +static void ext4_setup_csum_trigger(struct super_block *sb, + enum ext4_journal_trigger_type type, + void (*trigger)( + struct jbd2_buffer_trigger_type *type, + struct buffer_head *bh, + void *mapped_data, + size_t size)) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + sbi->s_journal_triggers[type].sb = sb; + sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger; +} + +static void ext4_free_sbi(struct ext4_sb_info *sbi) +{ + if (!sbi) + return; + + kfree(sbi->s_blockgroup_lock); + fs_put_dax(sbi->s_daxdev, NULL); + kfree(sbi); +} + +static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb) +{ + struct ext4_sb_info *sbi; + + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); + if (!sbi) + return NULL; + + sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off, + NULL, NULL); + + sbi->s_blockgroup_lock = + kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); + + if (!sbi->s_blockgroup_lock) + goto err_out; + + sb->s_fs_info = sbi; + sbi->s_sb = sb; + return sbi; +err_out: + fs_put_dax(sbi->s_daxdev, NULL); + kfree(sbi); + return NULL; +} + +static void ext4_set_def_opts(struct super_block *sb, + struct ext4_super_block *es) +{ + unsigned long def_mount_opts; + + /* Set defaults before we parse the mount options */ + def_mount_opts = le32_to_cpu(es->s_default_mount_opts); + set_opt(sb, INIT_INODE_TABLE); + if (def_mount_opts & EXT4_DEFM_DEBUG) + set_opt(sb, DEBUG); + if (def_mount_opts & EXT4_DEFM_BSDGROUPS) + set_opt(sb, GRPID); + if (def_mount_opts & EXT4_DEFM_UID16) + set_opt(sb, NO_UID32); + /* xattr user namespace & acls are now defaulted on */ + set_opt(sb, XATTR_USER); +#ifdef CONFIG_EXT4_FS_POSIX_ACL + set_opt(sb, POSIX_ACL); +#endif + if (ext4_has_feature_fast_commit(sb)) + set_opt2(sb, JOURNAL_FAST_COMMIT); + /* don't forget to enable journal_csum when metadata_csum is enabled. */ + if (ext4_has_metadata_csum(sb)) + set_opt(sb, JOURNAL_CHECKSUM); + + if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) + set_opt(sb, JOURNAL_DATA); + else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) + set_opt(sb, ORDERED_DATA); + else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) + set_opt(sb, WRITEBACK_DATA); + + if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC) + set_opt(sb, ERRORS_PANIC); + else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE) + set_opt(sb, ERRORS_CONT); + else + set_opt(sb, ERRORS_RO); + /* block_validity enabled by default; disable with noblock_validity */ + set_opt(sb, BLOCK_VALIDITY); + if (def_mount_opts & EXT4_DEFM_DISCARD) + set_opt(sb, DISCARD); + + if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) + set_opt(sb, BARRIER); + + /* + * enable delayed allocation by default + * Use -o nodelalloc to turn it off + */ + if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && + ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) + set_opt(sb, DELALLOC); + + if (sb->s_blocksize == PAGE_SIZE) + set_opt(sb, DIOREAD_NOLOCK); +} + +static int ext4_handle_clustersize(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int clustersize; + + /* Handle clustersize */ + clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); + if (ext4_has_feature_bigalloc(sb)) { + if (clustersize < sb->s_blocksize) { + ext4_msg(sb, KERN_ERR, + "cluster size (%d) smaller than " + "block size (%lu)", clustersize, sb->s_blocksize); + return -EINVAL; + } + sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - + le32_to_cpu(es->s_log_block_size); + sbi->s_clusters_per_group = + le32_to_cpu(es->s_clusters_per_group); + if (sbi->s_clusters_per_group > sb->s_blocksize * 8) { + ext4_msg(sb, KERN_ERR, + "#clusters per group too big: %lu", + sbi->s_clusters_per_group); + return -EINVAL; + } + if (sbi->s_blocks_per_group != + (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) { + ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " + "clusters per group (%lu) inconsistent", + sbi->s_blocks_per_group, + sbi->s_clusters_per_group); + return -EINVAL; + } + } else { + if (clustersize != sb->s_blocksize) { + ext4_msg(sb, KERN_ERR, + "fragment/cluster size (%d) != " + "block size (%lu)", clustersize, sb->s_blocksize); + return -EINVAL; + } + if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { + ext4_msg(sb, KERN_ERR, + "#blocks per group too big: %lu", + sbi->s_blocks_per_group); + return -EINVAL; + } + sbi->s_clusters_per_group = sbi->s_blocks_per_group; + sbi->s_cluster_bits = 0; + } + sbi->s_cluster_ratio = clustersize / sb->s_blocksize; + + /* Do we have standard group size of clustersize * 8 blocks ? */ + if (sbi->s_blocks_per_group == clustersize << 3) + set_opt2(sb, STD_GROUP_SIZE); + + return 0; +} + +static void ext4_fast_commit_init(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + /* Initialize fast commit stuff */ + atomic_set(&sbi->s_fc_subtid, 0); + INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]); + INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]); + INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]); + INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]); + sbi->s_fc_bytes = 0; + ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE); + sbi->s_fc_ineligible_tid = 0; + spin_lock_init(&sbi->s_fc_lock); + memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats)); + sbi->s_fc_replay_state.fc_regions = NULL; + sbi->s_fc_replay_state.fc_regions_size = 0; + sbi->s_fc_replay_state.fc_regions_used = 0; + sbi->s_fc_replay_state.fc_regions_valid = 0; + sbi->s_fc_replay_state.fc_modified_inodes = NULL; + sbi->s_fc_replay_state.fc_modified_inodes_size = 0; + sbi->s_fc_replay_state.fc_modified_inodes_used = 0; +} + +static int ext4_inode_info_init(struct super_block *sb, + struct ext4_super_block *es) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { + sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; + sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; + } else { + sbi->s_inode_size = le16_to_cpu(es->s_inode_size); + sbi->s_first_ino = le32_to_cpu(es->s_first_ino); + if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) { + ext4_msg(sb, KERN_ERR, "invalid first ino: %u", + sbi->s_first_ino); + return -EINVAL; + } + if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || + (!is_power_of_2(sbi->s_inode_size)) || + (sbi->s_inode_size > sb->s_blocksize)) { + ext4_msg(sb, KERN_ERR, + "unsupported inode size: %d", + sbi->s_inode_size); + ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize); + return -EINVAL; + } + /* + * i_atime_extra is the last extra field available for + * [acm]times in struct ext4_inode. Checking for that + * field should suffice to ensure we have extra space + * for all three. + */ + if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) + + sizeof(((struct ext4_inode *)0)->i_atime_extra)) { + sb->s_time_gran = 1; + sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX; + } else { + sb->s_time_gran = NSEC_PER_SEC; + sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX; + } + sb->s_time_min = EXT4_TIMESTAMP_MIN; + } + + if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { + sbi->s_want_extra_isize = sizeof(struct ext4_inode) - + EXT4_GOOD_OLD_INODE_SIZE; + if (ext4_has_feature_extra_isize(sb)) { + unsigned v, max = (sbi->s_inode_size - + EXT4_GOOD_OLD_INODE_SIZE); + + v = le16_to_cpu(es->s_want_extra_isize); + if (v > max) { + ext4_msg(sb, KERN_ERR, + "bad s_want_extra_isize: %d", v); + return -EINVAL; + } + if (sbi->s_want_extra_isize < v) + sbi->s_want_extra_isize = v; + + v = le16_to_cpu(es->s_min_extra_isize); + if (v > max) { + ext4_msg(sb, KERN_ERR, + "bad s_min_extra_isize: %d", v); + return -EINVAL; + } + if (sbi->s_want_extra_isize < v) + sbi->s_want_extra_isize = v; + } + } + + return 0; +} + +#if IS_ENABLED(CONFIG_UNICODE) +static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es) +{ + const struct ext4_sb_encodings *encoding_info; + struct unicode_map *encoding; + __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags); + + if (!ext4_has_feature_casefold(sb) || sb->s_encoding) + return 0; + + encoding_info = ext4_sb_read_encoding(es); + if (!encoding_info) { + ext4_msg(sb, KERN_ERR, + "Encoding requested by superblock is unknown"); + return -EINVAL; + } + + encoding = utf8_load(encoding_info->version); + if (IS_ERR(encoding)) { + ext4_msg(sb, KERN_ERR, + "can't mount with superblock charset: %s-%u.%u.%u " + "not supported by the kernel. flags: 0x%x.", + encoding_info->name, + unicode_major(encoding_info->version), + unicode_minor(encoding_info->version), + unicode_rev(encoding_info->version), + encoding_flags); + return -EINVAL; + } + ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: " + "%s-%u.%u.%u with flags 0x%hx", encoding_info->name, + unicode_major(encoding_info->version), + unicode_minor(encoding_info->version), + unicode_rev(encoding_info->version), + encoding_flags); + + sb->s_encoding = encoding; + sb->s_encoding_flags = encoding_flags; + + return 0; +} +#else +static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es) +{ + return 0; +} +#endif + +static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + /* Warn if metadata_csum and gdt_csum are both set. */ + if (ext4_has_feature_metadata_csum(sb) && + ext4_has_feature_gdt_csum(sb)) + ext4_warning(sb, "metadata_csum and uninit_bg are " + "redundant flags; please run fsck."); + + /* Check for a known checksum algorithm */ + if (!ext4_verify_csum_type(sb, es)) { + ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " + "unknown checksum algorithm."); + return -EINVAL; + } + ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE, + ext4_orphan_file_block_trigger); + + /* Load the checksum driver */ + sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(sbi->s_chksum_driver)) { + int ret = PTR_ERR(sbi->s_chksum_driver); + ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); + sbi->s_chksum_driver = NULL; + return ret; + } + + /* Check superblock checksum */ + if (!ext4_superblock_csum_verify(sb, es)) { + ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " + "invalid superblock checksum. Run e2fsck?"); + return -EFSBADCRC; + } + + /* Precompute checksum seed for all metadata */ + if (ext4_has_feature_csum_seed(sb)) + sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed); + else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb)) + sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, + sizeof(es->s_uuid)); + return 0; +} + +static int ext4_check_feature_compatibility(struct super_block *sb, + struct ext4_super_block *es, + int silent) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && + (ext4_has_compat_features(sb) || + ext4_has_ro_compat_features(sb) || + ext4_has_incompat_features(sb))) + ext4_msg(sb, KERN_WARNING, + "feature flags set on rev 0 fs, " + "running e2fsck is recommended"); + + if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { + set_opt2(sb, HURD_COMPAT); + if (ext4_has_feature_64bit(sb)) { + ext4_msg(sb, KERN_ERR, + "The Hurd can't support 64-bit file systems"); + return -EINVAL; + } + + /* + * ea_inode feature uses l_i_version field which is not + * available in HURD_COMPAT mode. + */ + if (ext4_has_feature_ea_inode(sb)) { + ext4_msg(sb, KERN_ERR, + "ea_inode feature is not supported for Hurd"); + return -EINVAL; + } + } + + if (IS_EXT2_SB(sb)) { + if (ext2_feature_set_ok(sb)) + ext4_msg(sb, KERN_INFO, "mounting ext2 file system " + "using the ext4 subsystem"); + else { + /* + * If we're probing be silent, if this looks like + * it's actually an ext[34] filesystem. + */ + if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) + return -EINVAL; + ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " + "to feature incompatibilities"); + return -EINVAL; + } + } + + if (IS_EXT3_SB(sb)) { + if (ext3_feature_set_ok(sb)) + ext4_msg(sb, KERN_INFO, "mounting ext3 file system " + "using the ext4 subsystem"); + else { + /* + * If we're probing be silent, if this looks like + * it's actually an ext4 filesystem. + */ + if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) + return -EINVAL; + ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " + "to feature incompatibilities"); + return -EINVAL; + } + } + + /* + * Check feature flags regardless of the revision level, since we + * previously didn't change the revision level when setting the flags, + * so there is a chance incompat flags are set on a rev 0 filesystem. + */ + if (!ext4_feature_set_ok(sb, (sb_rdonly(sb)))) + return -EINVAL; + + if (sbi->s_daxdev) { + if (sb->s_blocksize == PAGE_SIZE) + set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags); + else + ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n"); + } + + if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) { + if (ext4_has_feature_inline_data(sb)) { + ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem" + " that may contain inline data"); + return -EINVAL; + } + if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) { + ext4_msg(sb, KERN_ERR, + "DAX unsupported by block device."); + return -EINVAL; + } + } + + if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { + ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", + es->s_encryption_level); + return -EINVAL; + } + + return 0; +} + +static int ext4_check_geometry(struct super_block *sb, + struct ext4_super_block *es) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + __u64 blocks_count; + int err; + + if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) { + ext4_msg(sb, KERN_ERR, + "Number of reserved GDT blocks insanely large: %d", + le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks)); + return -EINVAL; + } + /* + * Test whether we have more sectors than will fit in sector_t, + * and whether the max offset is addressable by the page cache. + */ + err = generic_check_addressable(sb->s_blocksize_bits, + ext4_blocks_count(es)); + if (err) { + ext4_msg(sb, KERN_ERR, "filesystem" + " too large to mount safely on this system"); + return err; + } + + /* check blocks count against device size */ + blocks_count = sb_bdev_nr_blocks(sb); + if (blocks_count && ext4_blocks_count(es) > blocks_count) { + ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " + "exceeds size of device (%llu blocks)", + ext4_blocks_count(es), blocks_count); + return -EINVAL; + } + + /* + * It makes no sense for the first data block to be beyond the end + * of the filesystem. + */ + if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { + ext4_msg(sb, KERN_WARNING, "bad geometry: first data " + "block %u is beyond end of filesystem (%llu)", + le32_to_cpu(es->s_first_data_block), + ext4_blocks_count(es)); + return -EINVAL; + } + if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) && + (sbi->s_cluster_ratio == 1)) { + ext4_msg(sb, KERN_WARNING, "bad geometry: first data " + "block is 0 with a 1k block and cluster size"); + return -EINVAL; + } + + blocks_count = (ext4_blocks_count(es) - + le32_to_cpu(es->s_first_data_block) + + EXT4_BLOCKS_PER_GROUP(sb) - 1); + do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); + if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { + ext4_msg(sb, KERN_WARNING, "groups count too large: %llu " + "(block count %llu, first data block %u, " + "blocks per group %lu)", blocks_count, + ext4_blocks_count(es), + le32_to_cpu(es->s_first_data_block), + EXT4_BLOCKS_PER_GROUP(sb)); + return -EINVAL; + } + sbi->s_groups_count = blocks_count; + sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, + (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); + if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) != + le32_to_cpu(es->s_inodes_count)) { + ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu", + le32_to_cpu(es->s_inodes_count), + ((u64)sbi->s_groups_count * sbi->s_inodes_per_group)); + return -EINVAL; + } + + return 0; +} + +static int ext4_group_desc_init(struct super_block *sb, + struct ext4_super_block *es, + ext4_fsblk_t logical_sb_block, + ext4_group_t *first_not_zeroed) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + unsigned int db_count; + ext4_fsblk_t block; + int i; + + db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / + EXT4_DESC_PER_BLOCK(sb); + if (ext4_has_feature_meta_bg(sb)) { + if (le32_to_cpu(es->s_first_meta_bg) > db_count) { + ext4_msg(sb, KERN_WARNING, + "first meta block group too large: %u " + "(group descriptor block count %u)", + le32_to_cpu(es->s_first_meta_bg), db_count); + return -EINVAL; + } + } + rcu_assign_pointer(sbi->s_group_desc, + kvmalloc_array(db_count, + sizeof(struct buffer_head *), + GFP_KERNEL)); + if (sbi->s_group_desc == NULL) { + ext4_msg(sb, KERN_ERR, "not enough memory"); + return -ENOMEM; + } + + bgl_lock_init(sbi->s_blockgroup_lock); + + /* Pre-read the descriptors into the buffer cache */ + for (i = 0; i < db_count; i++) { + block = descriptor_loc(sb, logical_sb_block, i); + ext4_sb_breadahead_unmovable(sb, block); + } + + for (i = 0; i < db_count; i++) { + struct buffer_head *bh; + + block = descriptor_loc(sb, logical_sb_block, i); + bh = ext4_sb_bread_unmovable(sb, block); + if (IS_ERR(bh)) { + ext4_msg(sb, KERN_ERR, + "can't read group descriptor %d", i); + sbi->s_gdb_count = i; + return PTR_ERR(bh); + } + rcu_read_lock(); + rcu_dereference(sbi->s_group_desc)[i] = bh; + rcu_read_unlock(); + } + sbi->s_gdb_count = db_count; + if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) { + ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); + return -EFSCORRUPTED; + } + + return 0; +} + +static int ext4_load_and_init_journal(struct super_block *sb, + struct ext4_super_block *es, + struct ext4_fs_context *ctx) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + int err; + + err = ext4_load_journal(sb, es, ctx->journal_devnum); + if (err) + return err; + + if (ext4_has_feature_64bit(sb) && + !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_64BIT)) { + ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); + goto out; + } + + if (!set_journal_csum_feature_set(sb)) { + ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " + "feature set"); + goto out; + } + + if (test_opt2(sb, JOURNAL_FAST_COMMIT) && + !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) { + ext4_msg(sb, KERN_ERR, + "Failed to set fast commit journal feature"); + goto out; + } + + /* We have now updated the journal if required, so we can + * validate the data journaling mode. */ + switch (test_opt(sb, DATA_FLAGS)) { + case 0: + /* No mode set, assume a default based on the journal + * capabilities: ORDERED_DATA if the journal can + * cope, else JOURNAL_DATA + */ + if (jbd2_journal_check_available_features + (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { + set_opt(sb, ORDERED_DATA); + sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA; + } else { + set_opt(sb, JOURNAL_DATA); + sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; + } + break; + + case EXT4_MOUNT_ORDERED_DATA: + case EXT4_MOUNT_WRITEBACK_DATA: + if (!jbd2_journal_check_available_features + (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { + ext4_msg(sb, KERN_ERR, "Journal does not support " + "requested data journaling mode"); + goto out; + } + break; + default: + break; + } + + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && + test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "journal_async_commit in data=ordered mode"); + goto out; + } + + set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio); + + sbi->s_journal->j_submit_inode_data_buffers = + ext4_journal_submit_inode_data_buffers; + sbi->s_journal->j_finish_inode_data_buffers = + ext4_journal_finish_inode_data_buffers; + + return 0; + +out: + /* flush s_sb_upd_work before destroying the journal. */ + flush_work(&sbi->s_sb_upd_work); + jbd2_journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + return -EINVAL; +} + +static int ext4_check_journal_data_mode(struct super_block *sb) +{ + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { + printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with " + "data=journal disables delayed allocation, " + "dioread_nolock, O_DIRECT and fast_commit support!\n"); + /* can't mount with both data=journal and dioread_nolock. */ + clear_opt(sb, DIOREAD_NOLOCK); + clear_opt2(sb, JOURNAL_FAST_COMMIT); + if (test_opt2(sb, EXPLICIT_DELALLOC)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and delalloc"); + return -EINVAL; + } + if (test_opt(sb, DAX_ALWAYS)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dax"); + return -EINVAL; + } + if (ext4_has_feature_encrypt(sb)) { + ext4_msg(sb, KERN_WARNING, + "encrypted files will use data=ordered " + "instead of data journaling mode"); + } + if (test_opt(sb, DELALLOC)) + clear_opt(sb, DELALLOC); + } else { + sb->s_iflags |= SB_I_CGROUPWB; + } + + return 0; +} + +static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb, + int silent) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es; + ext4_fsblk_t logical_sb_block; + unsigned long offset = 0; + struct buffer_head *bh; + int ret = -EINVAL; + int blocksize; + + blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); + if (!blocksize) { + ext4_msg(sb, KERN_ERR, "unable to set blocksize"); + return -EINVAL; + } + + /* + * The ext4 superblock will not be buffer aligned for other than 1kB + * block sizes. We need to calculate the offset from buffer start. + */ + if (blocksize != EXT4_MIN_BLOCK_SIZE) { + logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE; + offset = do_div(logical_sb_block, blocksize); + } else { + logical_sb_block = sbi->s_sb_block; + } + + bh = ext4_sb_bread_unmovable(sb, logical_sb_block); + if (IS_ERR(bh)) { + ext4_msg(sb, KERN_ERR, "unable to read superblock"); + return PTR_ERR(bh); + } + /* + * Note: s_es must be initialized as soon as possible because + * some ext4 macro-instructions depend on its value + */ + es = (struct ext4_super_block *) (bh->b_data + offset); + sbi->s_es = es; + sb->s_magic = le16_to_cpu(es->s_magic); + if (sb->s_magic != EXT4_SUPER_MAGIC) { + if (!silent) + ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); + goto out; + } + + if (le32_to_cpu(es->s_log_block_size) > + (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { + ext4_msg(sb, KERN_ERR, + "Invalid log block size: %u", + le32_to_cpu(es->s_log_block_size)); + goto out; + } + if (le32_to_cpu(es->s_log_cluster_size) > + (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) { + ext4_msg(sb, KERN_ERR, + "Invalid log cluster size: %u", + le32_to_cpu(es->s_log_cluster_size)); + goto out; + } + + blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); + + /* + * If the default block size is not the same as the real block size, + * we need to reload it. + */ + if (sb->s_blocksize == blocksize) { + *lsb = logical_sb_block; + sbi->s_sbh = bh; + return 0; + } + + /* + * bh must be released before kill_bdev(), otherwise + * it won't be freed and its page also. kill_bdev() + * is called by sb_set_blocksize(). + */ + brelse(bh); + /* Validate the filesystem blocksize */ + if (!sb_set_blocksize(sb, blocksize)) { + ext4_msg(sb, KERN_ERR, "bad block size %d", + blocksize); + bh = NULL; + goto out; + } + + logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE; + offset = do_div(logical_sb_block, blocksize); + bh = ext4_sb_bread_unmovable(sb, logical_sb_block); + if (IS_ERR(bh)) { + ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try"); + ret = PTR_ERR(bh); + bh = NULL; + goto out; + } + es = (struct ext4_super_block *)(bh->b_data + offset); + sbi->s_es = es; + if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { + ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!"); + goto out; + } + *lsb = logical_sb_block; + sbi->s_sbh = bh; + return 0; +out: + brelse(bh); + return ret; +} + +static void ext4_hash_info_init(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + unsigned int i; + + for (i = 0; i < 4; i++) + sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); + + sbi->s_def_hash_version = es->s_def_hash_version; + if (ext4_has_feature_dir_index(sb)) { + i = le32_to_cpu(es->s_flags); + if (i & EXT2_FLAGS_UNSIGNED_HASH) + sbi->s_hash_unsigned = 3; + else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { +#ifdef __CHAR_UNSIGNED__ + if (!sb_rdonly(sb)) + es->s_flags |= + cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); + sbi->s_hash_unsigned = 3; +#else + if (!sb_rdonly(sb)) + es->s_flags |= + cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); +#endif + } + } +} + +static int ext4_block_group_meta_init(struct super_block *sb, int silent) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int has_huge_files; + + has_huge_files = ext4_has_feature_huge_file(sb); + sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, + has_huge_files); + sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); + + sbi->s_desc_size = le16_to_cpu(es->s_desc_size); + if (ext4_has_feature_64bit(sb)) { + if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || + sbi->s_desc_size > EXT4_MAX_DESC_SIZE || + !is_power_of_2(sbi->s_desc_size)) { + ext4_msg(sb, KERN_ERR, + "unsupported descriptor size %lu", + sbi->s_desc_size); + return -EINVAL; + } + } else + sbi->s_desc_size = EXT4_MIN_DESC_SIZE; + + sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); + sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); + + sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb); + if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) { + if (!silent) + ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); + return -EINVAL; + } + if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || + sbi->s_inodes_per_group > sb->s_blocksize * 8) { + ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n", + sbi->s_inodes_per_group); + return -EINVAL; + } + sbi->s_itb_per_group = sbi->s_inodes_per_group / + sbi->s_inodes_per_block; + sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb); + sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY; + sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); + sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); + + return 0; +} + +static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb) +{ + struct ext4_super_block *es = NULL; + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_fsblk_t logical_sb_block; + struct inode *root; + int needs_recovery; + int err; + ext4_group_t first_not_zeroed; + struct ext4_fs_context *ctx = fc->fs_private; + int silent = fc->sb_flags & SB_SILENT; + + /* Set defaults for the variables that will be set during parsing */ + if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) + ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + + sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; + sbi->s_sectors_written_start = + part_stat_read(sb->s_bdev, sectors[STAT_WRITE]); + + err = ext4_load_super(sb, &logical_sb_block, silent); + if (err) + goto out_fail; + + es = sbi->s_es; + sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); + + err = ext4_init_metadata_csum(sb, es); + if (err) + goto failed_mount; + + ext4_set_def_opts(sb, es); + + sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); + sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); + sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; + sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; + sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; + + /* + * set default s_li_wait_mult for lazyinit, for the case there is + * no mount option specified. + */ + sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; + + err = ext4_inode_info_init(sb, es); + if (err) + goto failed_mount; + + err = parse_apply_sb_mount_options(sb, ctx); + if (err < 0) + goto failed_mount; + + sbi->s_def_mount_opt = sbi->s_mount_opt; + sbi->s_def_mount_opt2 = sbi->s_mount_opt2; + + err = ext4_check_opt_consistency(fc, sb); + if (err < 0) + goto failed_mount; + + ext4_apply_options(fc, sb); + + err = ext4_encoding_init(sb, es); + if (err) + goto failed_mount; + + err = ext4_check_journal_data_mode(sb); + if (err) + goto failed_mount; + + sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); + + /* i_version is always enabled now */ + sb->s_flags |= SB_I_VERSION; + + err = ext4_check_feature_compatibility(sb, es, silent); + if (err) + goto failed_mount; + + err = ext4_block_group_meta_init(sb, silent); + if (err) + goto failed_mount; + + ext4_hash_info_init(sb); + + err = ext4_handle_clustersize(sb); + if (err) + goto failed_mount; + + err = ext4_check_geometry(sb, es); + if (err) + goto failed_mount; + + timer_setup(&sbi->s_err_report, print_daily_error_info, 0); + spin_lock_init(&sbi->s_error_lock); + INIT_WORK(&sbi->s_sb_upd_work, update_super_work); + + err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed); + if (err) + goto failed_mount3; + + err = ext4_es_register_shrinker(sbi); + if (err) + goto failed_mount3; + + sbi->s_stripe = ext4_get_stripe_size(sbi); + /* + * It's hard to get stripe aligned blocks if stripe is not aligned with + * cluster, just disable stripe and alert user to simpfy code and avoid + * stripe aligned allocation which will rarely successes. + */ + if (sbi->s_stripe > 0 && sbi->s_cluster_ratio > 1 && + sbi->s_stripe % sbi->s_cluster_ratio != 0) { + ext4_msg(sb, KERN_WARNING, + "stripe (%lu) is not aligned with cluster size (%u), " + "stripe is disabled", + sbi->s_stripe, sbi->s_cluster_ratio); + sbi->s_stripe = 0; + } + sbi->s_extent_max_zeroout_kb = 32; + + /* + * set up enough so that it can read an inode + */ + sb->s_op = &ext4_sops; + sb->s_export_op = &ext4_export_ops; + sb->s_xattr = ext4_xattr_handlers; +#ifdef CONFIG_FS_ENCRYPTION + sb->s_cop = &ext4_cryptops; +#endif +#ifdef CONFIG_FS_VERITY + sb->s_vop = &ext4_verityops; +#endif +#ifdef CONFIG_QUOTA + sb->dq_op = &ext4_quota_operations; + if (ext4_has_feature_quota(sb)) + sb->s_qcop = &dquot_quotactl_sysfile_ops; + else + sb->s_qcop = &ext4_qctl_operations; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ; +#endif + memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); + + INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ + mutex_init(&sbi->s_orphan_lock); + + ext4_fast_commit_init(sb); + + sb->s_root = NULL; + + needs_recovery = (es->s_last_orphan != 0 || + ext4_has_feature_orphan_present(sb) || + ext4_has_feature_journal_needs_recovery(sb)); + + if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) { + err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)); + if (err) + goto failed_mount3a; + } + + err = -EINVAL; + /* + * The first inode we look at is the journal inode. Don't try + * root first: it may be modified in the journal! + */ + if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { + err = ext4_load_and_init_journal(sb, es, ctx); + if (err) + goto failed_mount3a; + } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) && + ext4_has_feature_journal_needs_recovery(sb)) { + ext4_msg(sb, KERN_ERR, "required journal recovery " + "suppressed and not mounted read-only"); + goto failed_mount3a; + } else { + /* Nojournal mode, all journal mount options are illegal */ + if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "journal_async_commit, fs mounted w/o journal"); + goto failed_mount3a; + } + + if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "journal_checksum, fs mounted w/o journal"); + goto failed_mount3a; + } + if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "commit=%lu, fs mounted w/o journal", + sbi->s_commit_interval / HZ); + goto failed_mount3a; + } + if (EXT4_MOUNT_DATA_FLAGS & + (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "data=, fs mounted w/o journal"); + goto failed_mount3a; + } + sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM; + clear_opt(sb, JOURNAL_CHECKSUM); + clear_opt(sb, DATA_FLAGS); + clear_opt2(sb, JOURNAL_FAST_COMMIT); + sbi->s_journal = NULL; + needs_recovery = 0; + } + + if (!test_opt(sb, NO_MBCACHE)) { + sbi->s_ea_block_cache = ext4_xattr_create_cache(); + if (!sbi->s_ea_block_cache) { + ext4_msg(sb, KERN_ERR, + "Failed to create ea_block_cache"); + err = -EINVAL; + goto failed_mount_wq; + } + + if (ext4_has_feature_ea_inode(sb)) { + sbi->s_ea_inode_cache = ext4_xattr_create_cache(); + if (!sbi->s_ea_inode_cache) { + ext4_msg(sb, KERN_ERR, + "Failed to create ea_inode_cache"); + err = -EINVAL; + goto failed_mount_wq; + } + } + } + + /* + * Get the # of file system overhead blocks from the + * superblock if present. + */ + sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); + /* ignore the precalculated value if it is ridiculous */ + if (sbi->s_overhead > ext4_blocks_count(es)) + sbi->s_overhead = 0; + /* + * If the bigalloc feature is not enabled recalculating the + * overhead doesn't take long, so we might as well just redo + * it to make sure we are using the correct value. + */ + if (!ext4_has_feature_bigalloc(sb)) + sbi->s_overhead = 0; + if (sbi->s_overhead == 0) { + err = ext4_calculate_overhead(sb); + if (err) + goto failed_mount_wq; + } + + /* + * The maximum number of concurrent works can be high and + * concurrency isn't really necessary. Limit it to 1. + */ + EXT4_SB(sb)->rsv_conversion_wq = + alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); + if (!EXT4_SB(sb)->rsv_conversion_wq) { + printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); + err = -ENOMEM; + goto failed_mount4; + } + + /* + * The jbd2_journal_load will have done any necessary log recovery, + * so we can safely mount the rest of the filesystem now. + */ + + root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL); + if (IS_ERR(root)) { + ext4_msg(sb, KERN_ERR, "get root inode failed"); + err = PTR_ERR(root); + root = NULL; + goto failed_mount4; + } + if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { + ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); + iput(root); + err = -EFSCORRUPTED; + goto failed_mount4; + } + + sb->s_root = d_make_root(root); + if (!sb->s_root) { + ext4_msg(sb, KERN_ERR, "get root dentry failed"); + err = -ENOMEM; + goto failed_mount4; + } + + err = ext4_setup_super(sb, es, sb_rdonly(sb)); + if (err == -EROFS) { + sb->s_flags |= SB_RDONLY; + } else if (err) + goto failed_mount4a; + + ext4_set_resv_clusters(sb); + + if (test_opt(sb, BLOCK_VALIDITY)) { + err = ext4_setup_system_zone(sb); + if (err) { + ext4_msg(sb, KERN_ERR, "failed to initialize system " + "zone (%d)", err); + goto failed_mount4a; + } + } + ext4_fc_replay_cleanup(sb); + + ext4_ext_init(sb); + + /* + * Enable optimize_scan if number of groups is > threshold. This can be + * turned off by passing "mb_optimize_scan=0". This can also be + * turned on forcefully by passing "mb_optimize_scan=1". + */ + if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) { + if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD) + set_opt2(sb, MB_OPTIMIZE_SCAN); + else + clear_opt2(sb, MB_OPTIMIZE_SCAN); + } + + err = ext4_mb_init(sb); + if (err) { + ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", + err); + goto failed_mount5; + } + + /* + * We can only set up the journal commit callback once + * mballoc is initialized + */ + if (sbi->s_journal) + sbi->s_journal->j_commit_callback = + ext4_journal_commit_callback; + + err = ext4_percpu_param_init(sbi); + if (err) + goto failed_mount6; + + if (ext4_has_feature_flex_bg(sb)) + if (!ext4_fill_flex_info(sb)) { + ext4_msg(sb, KERN_ERR, + "unable to initialize " + "flex_bg meta info!"); + err = -ENOMEM; + goto failed_mount6; + } + + err = ext4_register_li_request(sb, first_not_zeroed); + if (err) + goto failed_mount6; + + err = ext4_register_sysfs(sb); + if (err) + goto failed_mount7; + + err = ext4_init_orphan_info(sb); + if (err) + goto failed_mount8; +#ifdef CONFIG_QUOTA + /* Enable quota usage during mount. */ + if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) { + err = ext4_enable_quotas(sb); + if (err) + goto failed_mount9; + } +#endif /* CONFIG_QUOTA */ + + /* + * Save the original bdev mapping's wb_err value which could be + * used to detect the metadata async write error. + */ + spin_lock_init(&sbi->s_bdev_wb_lock); + errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err, + &sbi->s_bdev_wb_err); + EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; + ext4_orphan_cleanup(sb, es); + EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; + /* + * Update the checksum after updating free space/inode counters and + * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect + * checksum in the buffer cache until it is written out and + * e2fsprogs programs trying to open a file system immediately + * after it is mounted can fail. + */ + ext4_superblock_csum_set(sb); + if (needs_recovery) { + ext4_msg(sb, KERN_INFO, "recovery complete"); + err = ext4_mark_recovery_complete(sb, es); + if (err) + goto failed_mount10; + } + + if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev)) + ext4_msg(sb, KERN_WARNING, + "mounting with \"discard\" option, but the device does not support discard"); + + if (es->s_error_count) + mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ + + /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ + ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); + ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); + ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); + atomic_set(&sbi->s_warning_count, 0); + atomic_set(&sbi->s_msg_count, 0); + + return 0; + +failed_mount10: + ext4_quotas_off(sb, EXT4_MAXQUOTAS); +failed_mount9: __maybe_unused + ext4_release_orphan_info(sb); +failed_mount8: + ext4_unregister_sysfs(sb); + kobject_put(&sbi->s_kobj); +failed_mount7: + ext4_unregister_li_request(sb); +failed_mount6: + ext4_mb_release(sb); + ext4_flex_groups_free(sbi); + ext4_percpu_param_destroy(sbi); +failed_mount5: + ext4_ext_release(sb); + ext4_release_system_zone(sb); +failed_mount4a: + dput(sb->s_root); + sb->s_root = NULL; +failed_mount4: + ext4_msg(sb, KERN_ERR, "mount failed"); + if (EXT4_SB(sb)->rsv_conversion_wq) + destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); +failed_mount_wq: + ext4_xattr_destroy_cache(sbi->s_ea_inode_cache); + sbi->s_ea_inode_cache = NULL; + + ext4_xattr_destroy_cache(sbi->s_ea_block_cache); + sbi->s_ea_block_cache = NULL; + + if (sbi->s_journal) { + /* flush s_sb_upd_work before journal destroy. */ + flush_work(&sbi->s_sb_upd_work); + jbd2_journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + } +failed_mount3a: + ext4_es_unregister_shrinker(sbi); +failed_mount3: + /* flush s_sb_upd_work before sbi destroy */ + flush_work(&sbi->s_sb_upd_work); + del_timer_sync(&sbi->s_err_report); + ext4_stop_mmpd(sbi); + ext4_group_desc_free(sbi); +failed_mount: + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); + +#if IS_ENABLED(CONFIG_UNICODE) + utf8_unload(sb->s_encoding); +#endif + +#ifdef CONFIG_QUOTA + for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(get_qf_name(sb, sbi, i)); +#endif + fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy); + brelse(sbi->s_sbh); + if (sbi->s_journal_bdev) { + invalidate_bdev(sbi->s_journal_bdev); + blkdev_put(sbi->s_journal_bdev, sb); + } +out_fail: + invalidate_bdev(sb->s_bdev); + sb->s_fs_info = NULL; + return err; +} + +static int ext4_fill_super(struct super_block *sb, struct fs_context *fc) +{ + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi; + const char *descr; + int ret; + + sbi = ext4_alloc_sbi(sb); + if (!sbi) + return -ENOMEM; + + fc->s_fs_info = sbi; + + /* Cleanup superblock name */ + strreplace(sb->s_id, '/', '!'); + + sbi->s_sb_block = 1; /* Default super block location */ + if (ctx->spec & EXT4_SPEC_s_sb_block) + sbi->s_sb_block = ctx->s_sb_block; + + ret = __ext4_fill_super(fc, sb); + if (ret < 0) + goto free_sbi; + + if (sbi->s_journal) { + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) + descr = " journalled data mode"; + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) + descr = " ordered data mode"; + else + descr = " writeback data mode"; + } else + descr = "out journal"; + + if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount")) + ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. " + "Quota mode: %s.", &sb->s_uuid, + sb_rdonly(sb) ? "ro" : "r/w", descr, + ext4_quota_mode(sb)); + + /* Update the s_overhead_clusters if necessary */ + ext4_update_overhead(sb, false); + return 0; + +free_sbi: + ext4_free_sbi(sbi); + fc->s_fs_info = NULL; + return ret; +} + +static int ext4_get_tree(struct fs_context *fc) +{ + return get_tree_bdev(fc, ext4_fill_super); +} + +/* + * Setup any per-fs journal parameters now. We'll do this both on + * initial mount, once the journal has been initialised but before we've + * done any recovery; and again on any subsequent remount. + */ +static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + journal->j_commit_interval = sbi->s_commit_interval; + journal->j_min_batch_time = sbi->s_min_batch_time; + journal->j_max_batch_time = sbi->s_max_batch_time; + ext4_fc_init(sb, journal); + + write_lock(&journal->j_state_lock); + if (test_opt(sb, BARRIER)) + journal->j_flags |= JBD2_BARRIER; + else + journal->j_flags &= ~JBD2_BARRIER; + if (test_opt(sb, DATA_ERR_ABORT)) + journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; + else + journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; + /* + * Always enable journal cycle record option, letting the journal + * records log transactions continuously between each mount. + */ + journal->j_flags |= JBD2_CYCLE_RECORD; + write_unlock(&journal->j_state_lock); +} + +static struct inode *ext4_get_journal_inode(struct super_block *sb, + unsigned int journal_inum) +{ + struct inode *journal_inode; + + /* + * Test for the existence of a valid inode on disk. Bad things + * happen if we iget() an unused inode, as the subsequent iput() + * will try to delete it. + */ + journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL); + if (IS_ERR(journal_inode)) { + ext4_msg(sb, KERN_ERR, "no journal found"); + return ERR_CAST(journal_inode); + } + if (!journal_inode->i_nlink) { + make_bad_inode(journal_inode); + iput(journal_inode); + ext4_msg(sb, KERN_ERR, "journal inode is deleted"); + return ERR_PTR(-EFSCORRUPTED); + } + if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) { + ext4_msg(sb, KERN_ERR, "invalid journal inode"); + iput(journal_inode); + return ERR_PTR(-EFSCORRUPTED); + } + + ext4_debug("Journal inode found at %p: %lld bytes\n", + journal_inode, journal_inode->i_size); + return journal_inode; +} + +static int ext4_journal_bmap(journal_t *journal, sector_t *block) +{ + struct ext4_map_blocks map; + int ret; + + if (journal->j_inode == NULL) + return 0; + + map.m_lblk = *block; + map.m_len = 1; + ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0); + if (ret <= 0) { + ext4_msg(journal->j_inode->i_sb, KERN_CRIT, + "journal bmap failed: block %llu ret %d\n", + *block, ret); + jbd2_journal_abort(journal, ret ? ret : -EIO); + return ret; + } + *block = map.m_pblk; + return 0; +} + +static journal_t *ext4_open_inode_journal(struct super_block *sb, + unsigned int journal_inum) +{ + struct inode *journal_inode; + journal_t *journal; + + journal_inode = ext4_get_journal_inode(sb, journal_inum); + if (IS_ERR(journal_inode)) + return ERR_CAST(journal_inode); + + journal = jbd2_journal_init_inode(journal_inode); + if (IS_ERR(journal)) { + ext4_msg(sb, KERN_ERR, "Could not load journal inode"); + iput(journal_inode); + return ERR_CAST(journal); + } + journal->j_private = sb; + journal->j_bmap = ext4_journal_bmap; + ext4_init_journal_params(sb, journal); + return journal; +} + +static struct block_device *ext4_get_journal_blkdev(struct super_block *sb, + dev_t j_dev, ext4_fsblk_t *j_start, + ext4_fsblk_t *j_len) +{ + struct buffer_head *bh; + struct block_device *bdev; + int hblock, blocksize; + ext4_fsblk_t sb_block; + unsigned long offset; + struct ext4_super_block *es; + int errno; + + /* see get_tree_bdev why this is needed and safe */ + up_write(&sb->s_umount); + bdev = blkdev_get_by_dev(j_dev, BLK_OPEN_READ | BLK_OPEN_WRITE, sb, + &fs_holder_ops); + down_write(&sb->s_umount); + if (IS_ERR(bdev)) { + ext4_msg(sb, KERN_ERR, + "failed to open journal device unknown-block(%u,%u) %ld", + MAJOR(j_dev), MINOR(j_dev), PTR_ERR(bdev)); + return ERR_CAST(bdev); + } + + blocksize = sb->s_blocksize; + hblock = bdev_logical_block_size(bdev); + if (blocksize < hblock) { + ext4_msg(sb, KERN_ERR, + "blocksize too small for journal device"); + errno = -EINVAL; + goto out_bdev; + } + + sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; + offset = EXT4_MIN_BLOCK_SIZE % blocksize; + set_blocksize(bdev, blocksize); + bh = __bread(bdev, sb_block, blocksize); + if (!bh) { + ext4_msg(sb, KERN_ERR, "couldn't read superblock of " + "external journal"); + errno = -EINVAL; + goto out_bdev; + } + + es = (struct ext4_super_block *) (bh->b_data + offset); + if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || + !(le32_to_cpu(es->s_feature_incompat) & + EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { + ext4_msg(sb, KERN_ERR, "external journal has bad superblock"); + errno = -EFSCORRUPTED; + goto out_bh; + } + + if ((le32_to_cpu(es->s_feature_ro_compat) & + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && + es->s_checksum != ext4_superblock_csum(sb, es)) { + ext4_msg(sb, KERN_ERR, "external journal has corrupt superblock"); + errno = -EFSCORRUPTED; + goto out_bh; + } + + if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { + ext4_msg(sb, KERN_ERR, "journal UUID does not match"); + errno = -EFSCORRUPTED; + goto out_bh; + } + + *j_start = sb_block + 1; + *j_len = ext4_blocks_count(es); + brelse(bh); + return bdev; + +out_bh: + brelse(bh); +out_bdev: + blkdev_put(bdev, sb); + return ERR_PTR(errno); +} + +static journal_t *ext4_open_dev_journal(struct super_block *sb, + dev_t j_dev) +{ + journal_t *journal; + ext4_fsblk_t j_start; + ext4_fsblk_t j_len; + struct block_device *journal_bdev; + int errno = 0; + + journal_bdev = ext4_get_journal_blkdev(sb, j_dev, &j_start, &j_len); + if (IS_ERR(journal_bdev)) + return ERR_CAST(journal_bdev); + + journal = jbd2_journal_init_dev(journal_bdev, sb->s_bdev, j_start, + j_len, sb->s_blocksize); + if (IS_ERR(journal)) { + ext4_msg(sb, KERN_ERR, "failed to create device journal"); + errno = PTR_ERR(journal); + goto out_bdev; + } + if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { + ext4_msg(sb, KERN_ERR, "External journal has more than one " + "user (unsupported) - %d", + be32_to_cpu(journal->j_superblock->s_nr_users)); + errno = -EINVAL; + goto out_journal; + } + journal->j_private = sb; + EXT4_SB(sb)->s_journal_bdev = journal_bdev; + ext4_init_journal_params(sb, journal); + return journal; + +out_journal: + jbd2_journal_destroy(journal); +out_bdev: + blkdev_put(journal_bdev, sb); + return ERR_PTR(errno); +} + +static int ext4_load_journal(struct super_block *sb, + struct ext4_super_block *es, + unsigned long journal_devnum) +{ + journal_t *journal; + unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); + dev_t journal_dev; + int err = 0; + int really_read_only; + int journal_dev_ro; + + if (WARN_ON_ONCE(!ext4_has_feature_journal(sb))) + return -EFSCORRUPTED; + + if (journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + ext4_msg(sb, KERN_INFO, "external journal device major/minor " + "numbers have changed"); + journal_dev = new_decode_dev(journal_devnum); + } else + journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); + + if (journal_inum && journal_dev) { + ext4_msg(sb, KERN_ERR, + "filesystem has both journal inode and journal device!"); + return -EINVAL; + } + + if (journal_inum) { + journal = ext4_open_inode_journal(sb, journal_inum); + if (IS_ERR(journal)) + return PTR_ERR(journal); + } else { + journal = ext4_open_dev_journal(sb, journal_dev); + if (IS_ERR(journal)) + return PTR_ERR(journal); + } + + journal_dev_ro = bdev_read_only(journal->j_dev); + really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro; + + if (journal_dev_ro && !sb_rdonly(sb)) { + ext4_msg(sb, KERN_ERR, + "journal device read-only, try mounting with '-o ro'"); + err = -EROFS; + goto err_out; + } + + /* + * Are we loading a blank journal or performing recovery after a + * crash? For recovery, we need to check in advance whether we + * can get read-write access to the device. + */ + if (ext4_has_feature_journal_needs_recovery(sb)) { + if (sb_rdonly(sb)) { + ext4_msg(sb, KERN_INFO, "INFO: recovery " + "required on readonly filesystem"); + if (really_read_only) { + ext4_msg(sb, KERN_ERR, "write access " + "unavailable, cannot proceed " + "(try mounting with noload)"); + err = -EROFS; + goto err_out; + } + ext4_msg(sb, KERN_INFO, "write access will " + "be enabled during recovery"); + } + } + + if (!(journal->j_flags & JBD2_BARRIER)) + ext4_msg(sb, KERN_INFO, "barriers disabled"); + + if (!ext4_has_feature_journal_needs_recovery(sb)) + err = jbd2_journal_wipe(journal, !really_read_only); + if (!err) { + char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); + __le16 orig_state; + bool changed = false; + + if (save) + memcpy(save, ((char *) es) + + EXT4_S_ERR_START, EXT4_S_ERR_LEN); + err = jbd2_journal_load(journal); + if (save && memcmp(((char *) es) + EXT4_S_ERR_START, + save, EXT4_S_ERR_LEN)) { + memcpy(((char *) es) + EXT4_S_ERR_START, + save, EXT4_S_ERR_LEN); + changed = true; + } + kfree(save); + orig_state = es->s_state; + es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state & + EXT4_ERROR_FS); + if (orig_state != es->s_state) + changed = true; + /* Write out restored error information to the superblock */ + if (changed && !really_read_only) { + int err2; + err2 = ext4_commit_super(sb); + err = err ? : err2; + } + } + + if (err) { + ext4_msg(sb, KERN_ERR, "error loading journal"); + goto err_out; + } + + EXT4_SB(sb)->s_journal = journal; + err = ext4_clear_journal_err(sb, es); + if (err) { + EXT4_SB(sb)->s_journal = NULL; + jbd2_journal_destroy(journal); + return err; + } + + if (!really_read_only && journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + es->s_journal_dev = cpu_to_le32(journal_devnum); + ext4_commit_super(sb); + } + if (!really_read_only && journal_inum && + journal_inum != le32_to_cpu(es->s_journal_inum)) { + es->s_journal_inum = cpu_to_le32(journal_inum); + ext4_commit_super(sb); + } + + return 0; + +err_out: + jbd2_journal_destroy(journal); + return err; +} + +/* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */ +static void ext4_update_super(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + struct buffer_head *sbh = sbi->s_sbh; + + lock_buffer(sbh); + /* + * If the file system is mounted read-only, don't update the + * superblock write time. This avoids updating the superblock + * write time when we are mounting the root file system + * read/only but we need to replay the journal; at that point, + * for people who are east of GMT and who make their clock + * tick in localtime for Windows bug-for-bug compatibility, + * the clock is set in the future, and this will cause e2fsck + * to complain and force a full file system check. + */ + if (!sb_rdonly(sb)) + ext4_update_tstamp(es, s_wtime); + es->s_kbytes_written = + cpu_to_le64(sbi->s_kbytes_written + + ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) - + sbi->s_sectors_written_start) >> 1)); + if (percpu_counter_initialized(&sbi->s_freeclusters_counter)) + ext4_free_blocks_count_set(es, + EXT4_C2B(sbi, percpu_counter_sum_positive( + &sbi->s_freeclusters_counter))); + if (percpu_counter_initialized(&sbi->s_freeinodes_counter)) + es->s_free_inodes_count = + cpu_to_le32(percpu_counter_sum_positive( + &sbi->s_freeinodes_counter)); + /* Copy error information to the on-disk superblock */ + spin_lock(&sbi->s_error_lock); + if (sbi->s_add_error_count > 0) { + es->s_state |= cpu_to_le16(EXT4_ERROR_FS); + if (!es->s_first_error_time && !es->s_first_error_time_hi) { + __ext4_update_tstamp(&es->s_first_error_time, + &es->s_first_error_time_hi, + sbi->s_first_error_time); + strncpy(es->s_first_error_func, sbi->s_first_error_func, + sizeof(es->s_first_error_func)); + es->s_first_error_line = + cpu_to_le32(sbi->s_first_error_line); + es->s_first_error_ino = + cpu_to_le32(sbi->s_first_error_ino); + es->s_first_error_block = + cpu_to_le64(sbi->s_first_error_block); + es->s_first_error_errcode = + ext4_errno_to_code(sbi->s_first_error_code); + } + __ext4_update_tstamp(&es->s_last_error_time, + &es->s_last_error_time_hi, + sbi->s_last_error_time); + strncpy(es->s_last_error_func, sbi->s_last_error_func, + sizeof(es->s_last_error_func)); + es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line); + es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino); + es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block); + es->s_last_error_errcode = + ext4_errno_to_code(sbi->s_last_error_code); + /* + * Start the daily error reporting function if it hasn't been + * started already + */ + if (!es->s_error_count) + mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); + le32_add_cpu(&es->s_error_count, sbi->s_add_error_count); + sbi->s_add_error_count = 0; + } + spin_unlock(&sbi->s_error_lock); + + ext4_superblock_csum_set(sb); + unlock_buffer(sbh); +} + +static int ext4_commit_super(struct super_block *sb) +{ + struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; + + if (!sbh) + return -EINVAL; + if (block_device_ejected(sb)) + return -ENODEV; + + ext4_update_super(sb); + + lock_buffer(sbh); + /* Buffer got discarded which means block device got invalidated */ + if (!buffer_mapped(sbh)) { + unlock_buffer(sbh); + return -EIO; + } + + if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) { + /* + * Oh, dear. A previous attempt to write the + * superblock failed. This could happen because the + * USB device was yanked out. Or it could happen to + * be a transient write error and maybe the block will + * be remapped. Nothing we can do but to retry the + * write and hope for the best. + */ + ext4_msg(sb, KERN_ERR, "previous I/O error to " + "superblock detected"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + get_bh(sbh); + /* Clear potential dirty bit if it was journalled update */ + clear_buffer_dirty(sbh); + sbh->b_end_io = end_buffer_write_sync; + submit_bh(REQ_OP_WRITE | REQ_SYNC | + (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh); + wait_on_buffer(sbh); + if (buffer_write_io_error(sbh)) { + ext4_msg(sb, KERN_ERR, "I/O error while writing " + "superblock"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + return -EIO; + } + return 0; +} + +/* + * Have we just finished recovery? If so, and if we are mounting (or + * remounting) the filesystem readonly, then we will end up with a + * consistent fs on disk. Record that fact. + */ +static int ext4_mark_recovery_complete(struct super_block *sb, + struct ext4_super_block *es) +{ + int err; + journal_t *journal = EXT4_SB(sb)->s_journal; + + if (!ext4_has_feature_journal(sb)) { + if (journal != NULL) { + ext4_error(sb, "Journal got removed while the fs was " + "mounted!"); + return -EFSCORRUPTED; + } + return 0; + } + jbd2_journal_lock_updates(journal); + err = jbd2_journal_flush(journal, 0); + if (err < 0) + goto out; + + if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) || + ext4_has_feature_orphan_present(sb))) { + if (!ext4_orphan_file_empty(sb)) { + ext4_error(sb, "Orphan file not empty on read-only fs."); + err = -EFSCORRUPTED; + goto out; + } + ext4_clear_feature_journal_needs_recovery(sb); + ext4_clear_feature_orphan_present(sb); + ext4_commit_super(sb); + } +out: + jbd2_journal_unlock_updates(journal); + return err; +} + +/* + * If we are mounting (or read-write remounting) a filesystem whose journal + * has recorded an error from a previous lifetime, move that error to the + * main filesystem now. + */ +static int ext4_clear_journal_err(struct super_block *sb, + struct ext4_super_block *es) +{ + journal_t *journal; + int j_errno; + const char *errstr; + + if (!ext4_has_feature_journal(sb)) { + ext4_error(sb, "Journal got removed while the fs was mounted!"); + return -EFSCORRUPTED; + } + + journal = EXT4_SB(sb)->s_journal; + + /* + * Now check for any error status which may have been recorded in the + * journal by a prior ext4_error() or ext4_abort() + */ + + j_errno = jbd2_journal_errno(journal); + if (j_errno) { + char nbuf[16]; + + errstr = ext4_decode_error(sb, j_errno, nbuf); + ext4_warning(sb, "Filesystem error recorded " + "from previous mount: %s", errstr); + + EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; + es->s_state |= cpu_to_le16(EXT4_ERROR_FS); + j_errno = ext4_commit_super(sb); + if (j_errno) + return j_errno; + ext4_warning(sb, "Marked fs in need of filesystem check."); + + jbd2_journal_clear_err(journal); + jbd2_journal_update_sb_errno(journal); + } + return 0; +} + +/* + * Force the running and committing transactions to commit, + * and wait on the commit. + */ +int ext4_force_commit(struct super_block *sb) +{ + return ext4_journal_force_commit(EXT4_SB(sb)->s_journal); +} + +static int ext4_sync_fs(struct super_block *sb, int wait) +{ + int ret = 0; + tid_t target; + bool needs_barrier = false; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (unlikely(ext4_forced_shutdown(sb))) + return 0; + + trace_ext4_sync_fs(sb, wait); + flush_workqueue(sbi->rsv_conversion_wq); + /* + * Writeback quota in non-journalled quota case - journalled quota has + * no dirty dquots + */ + dquot_writeback_dquots(sb, -1); + /* + * Data writeback is possible w/o journal transaction, so barrier must + * being sent at the end of the function. But we can skip it if + * transaction_commit will do it for us. + */ + if (sbi->s_journal) { + target = jbd2_get_latest_transaction(sbi->s_journal); + if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && + !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) + needs_barrier = true; + + if (jbd2_journal_start_commit(sbi->s_journal, &target)) { + if (wait) + ret = jbd2_log_wait_commit(sbi->s_journal, + target); + } + } else if (wait && test_opt(sb, BARRIER)) + needs_barrier = true; + if (needs_barrier) { + int err; + err = blkdev_issue_flush(sb->s_bdev); + if (!ret) + ret = err; + } + + return ret; +} + +/* + * LVM calls this function before a (read-only) snapshot is created. This + * gives us a chance to flush the journal completely and mark the fs clean. + * + * Note that only this function cannot bring a filesystem to be in a clean + * state independently. It relies on upper layer to stop all data & metadata + * modifications. + */ +static int ext4_freeze(struct super_block *sb) +{ + int error = 0; + journal_t *journal = EXT4_SB(sb)->s_journal; + + if (journal) { + /* Now we set up the journal barrier. */ + jbd2_journal_lock_updates(journal); + + /* + * Don't clear the needs_recovery flag if we failed to + * flush the journal. + */ + error = jbd2_journal_flush(journal, 0); + if (error < 0) + goto out; + + /* Journal blocked and flushed, clear needs_recovery flag. */ + ext4_clear_feature_journal_needs_recovery(sb); + if (ext4_orphan_file_empty(sb)) + ext4_clear_feature_orphan_present(sb); + } + + error = ext4_commit_super(sb); +out: + if (journal) + /* we rely on upper layer to stop further updates */ + jbd2_journal_unlock_updates(journal); + return error; +} + +/* + * Called by LVM after the snapshot is done. We need to reset the RECOVER + * flag here, even though the filesystem is not technically dirty yet. + */ +static int ext4_unfreeze(struct super_block *sb) +{ + if (ext4_forced_shutdown(sb)) + return 0; + + if (EXT4_SB(sb)->s_journal) { + /* Reset the needs_recovery flag before the fs is unlocked. */ + ext4_set_feature_journal_needs_recovery(sb); + if (ext4_has_feature_orphan_file(sb)) + ext4_set_feature_orphan_present(sb); + } + + ext4_commit_super(sb); + return 0; +} + +/* + * Structure to save mount options for ext4_remount's benefit + */ +struct ext4_mount_options { + unsigned long s_mount_opt; + unsigned long s_mount_opt2; + kuid_t s_resuid; + kgid_t s_resgid; + unsigned long s_commit_interval; + u32 s_min_batch_time, s_max_batch_time; +#ifdef CONFIG_QUOTA + int s_jquota_fmt; + char *s_qf_names[EXT4_MAXQUOTAS]; +#endif +}; + +static int __ext4_remount(struct fs_context *fc, struct super_block *sb) +{ + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_super_block *es; + struct ext4_sb_info *sbi = EXT4_SB(sb); + unsigned long old_sb_flags; + struct ext4_mount_options old_opts; + ext4_group_t g; + int err = 0; + int alloc_ctx; +#ifdef CONFIG_QUOTA + int enable_quota = 0; + int i, j; + char *to_free[EXT4_MAXQUOTAS]; +#endif + + + /* Store the original options */ + old_sb_flags = sb->s_flags; + old_opts.s_mount_opt = sbi->s_mount_opt; + old_opts.s_mount_opt2 = sbi->s_mount_opt2; + old_opts.s_resuid = sbi->s_resuid; + old_opts.s_resgid = sbi->s_resgid; + old_opts.s_commit_interval = sbi->s_commit_interval; + old_opts.s_min_batch_time = sbi->s_min_batch_time; + old_opts.s_max_batch_time = sbi->s_max_batch_time; +#ifdef CONFIG_QUOTA + old_opts.s_jquota_fmt = sbi->s_jquota_fmt; + for (i = 0; i < EXT4_MAXQUOTAS; i++) + if (sbi->s_qf_names[i]) { + char *qf_name = get_qf_name(sb, sbi, i); + + old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL); + if (!old_opts.s_qf_names[i]) { + for (j = 0; j < i; j++) + kfree(old_opts.s_qf_names[j]); + return -ENOMEM; + } + } else + old_opts.s_qf_names[i] = NULL; +#endif + if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) { + if (sbi->s_journal && sbi->s_journal->j_task->io_context) + ctx->journal_ioprio = + sbi->s_journal->j_task->io_context->ioprio; + else + ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + + } + + /* + * Changing the DIOREAD_NOLOCK or DELALLOC mount options may cause + * two calls to ext4_should_dioread_nolock() to return inconsistent + * values, triggering WARN_ON in ext4_add_complete_io(). we grab + * here s_writepages_rwsem to avoid race between writepages ops and + * remount. + */ + alloc_ctx = ext4_writepages_down_write(sb); + ext4_apply_options(fc, sb); + ext4_writepages_up_write(sb, alloc_ctx); + + if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ + test_opt(sb, JOURNAL_CHECKSUM)) { + ext4_msg(sb, KERN_ERR, "changing journal_checksum " + "during remount not supported; ignoring"); + sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; + } + + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { + if (test_opt2(sb, EXPLICIT_DELALLOC)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and delalloc"); + err = -EINVAL; + goto restore_opts; + } + if (test_opt(sb, DIOREAD_NOLOCK)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dioread_nolock"); + err = -EINVAL; + goto restore_opts; + } + } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) { + if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "journal_async_commit in data=ordered mode"); + err = -EINVAL; + goto restore_opts; + } + } + + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) { + ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount"); + err = -EINVAL; + goto restore_opts; + } + + if (test_opt2(sb, ABORT)) + ext4_abort(sb, ESHUTDOWN, "Abort forced by user"); + + sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); + + es = sbi->s_es; + + if (sbi->s_journal) { + ext4_init_journal_params(sb, sbi->s_journal); + set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio); + } + + /* Flush outstanding errors before changing fs state */ + flush_work(&sbi->s_sb_upd_work); + + if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) { + if (ext4_forced_shutdown(sb)) { + err = -EROFS; + goto restore_opts; + } + + if (fc->sb_flags & SB_RDONLY) { + err = sync_filesystem(sb); + if (err < 0) + goto restore_opts; + err = dquot_suspend(sb, -1); + if (err < 0) + goto restore_opts; + + /* + * First of all, the unconditional stuff we have to do + * to disable replay of the journal when we next remount + */ + sb->s_flags |= SB_RDONLY; + + /* + * OK, test if we are remounting a valid rw partition + * readonly, and if so set the rdonly flag and then + * mark the partition as valid again. + */ + if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && + (sbi->s_mount_state & EXT4_VALID_FS)) + es->s_state = cpu_to_le16(sbi->s_mount_state); + + if (sbi->s_journal) { + /* + * We let remount-ro finish even if marking fs + * as clean failed... + */ + ext4_mark_recovery_complete(sb, es); + } + } else { + /* Make sure we can mount this feature set readwrite */ + if (ext4_has_feature_readonly(sb) || + !ext4_feature_set_ok(sb, 0)) { + err = -EROFS; + goto restore_opts; + } + /* + * Make sure the group descriptor checksums + * are sane. If they aren't, refuse to remount r/w. + */ + for (g = 0; g < sbi->s_groups_count; g++) { + struct ext4_group_desc *gdp = + ext4_get_group_desc(sb, g, NULL); + + if (!ext4_group_desc_csum_verify(sb, g, gdp)) { + ext4_msg(sb, KERN_ERR, + "ext4_remount: Checksum for group %u failed (%u!=%u)", + g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)), + le16_to_cpu(gdp->bg_checksum)); + err = -EFSBADCRC; + goto restore_opts; + } + } + + /* + * If we have an unprocessed orphan list hanging + * around from a previously readonly bdev mount, + * require a full umount/remount for now. + */ + if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) { + ext4_msg(sb, KERN_WARNING, "Couldn't " + "remount RDWR because of unprocessed " + "orphan inode list. Please " + "umount/remount instead"); + err = -EINVAL; + goto restore_opts; + } + + /* + * Mounting a RDONLY partition read-write, so reread + * and store the current valid flag. (It may have + * been changed by e2fsck since we originally mounted + * the partition.) + */ + if (sbi->s_journal) { + err = ext4_clear_journal_err(sb, es); + if (err) + goto restore_opts; + } + sbi->s_mount_state = (le16_to_cpu(es->s_state) & + ~EXT4_FC_REPLAY); + + err = ext4_setup_super(sb, es, 0); + if (err) + goto restore_opts; + + sb->s_flags &= ~SB_RDONLY; + if (ext4_has_feature_mmp(sb)) { + err = ext4_multi_mount_protect(sb, + le64_to_cpu(es->s_mmp_block)); + if (err) + goto restore_opts; + } +#ifdef CONFIG_QUOTA + enable_quota = 1; +#endif + } + } + + /* + * Handle creation of system zone data early because it can fail. + * Releasing of existing data is done when we are sure remount will + * succeed. + */ + if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) { + err = ext4_setup_system_zone(sb); + if (err) + goto restore_opts; + } + + if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) { + err = ext4_commit_super(sb); + if (err) + goto restore_opts; + } + +#ifdef CONFIG_QUOTA + if (enable_quota) { + if (sb_any_quota_suspended(sb)) + dquot_resume(sb, -1); + else if (ext4_has_feature_quota(sb)) { + err = ext4_enable_quotas(sb); + if (err) + goto restore_opts; + } + } + /* Release old quota file names */ + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(old_opts.s_qf_names[i]); +#endif + if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks) + ext4_release_system_zone(sb); + + /* + * Reinitialize lazy itable initialization thread based on + * current settings + */ + if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE)) + ext4_unregister_li_request(sb); + else { + ext4_group_t first_not_zeroed; + first_not_zeroed = ext4_has_uninit_itable(sb); + ext4_register_li_request(sb, first_not_zeroed); + } + + if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb)) + ext4_stop_mmpd(sbi); + + return 0; + +restore_opts: + /* + * If there was a failing r/w to ro transition, we may need to + * re-enable quota + */ + if (sb_rdonly(sb) && !(old_sb_flags & SB_RDONLY) && + sb_any_quota_suspended(sb)) + dquot_resume(sb, -1); + + alloc_ctx = ext4_writepages_down_write(sb); + sb->s_flags = old_sb_flags; + sbi->s_mount_opt = old_opts.s_mount_opt; + sbi->s_mount_opt2 = old_opts.s_mount_opt2; + sbi->s_resuid = old_opts.s_resuid; + sbi->s_resgid = old_opts.s_resgid; + sbi->s_commit_interval = old_opts.s_commit_interval; + sbi->s_min_batch_time = old_opts.s_min_batch_time; + sbi->s_max_batch_time = old_opts.s_max_batch_time; + ext4_writepages_up_write(sb, alloc_ctx); + + if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks) + ext4_release_system_zone(sb); +#ifdef CONFIG_QUOTA + sbi->s_jquota_fmt = old_opts.s_jquota_fmt; + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + to_free[i] = get_qf_name(sb, sbi, i); + rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]); + } + synchronize_rcu(); + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(to_free[i]); +#endif + if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb)) + ext4_stop_mmpd(sbi); + return err; +} + +static int ext4_reconfigure(struct fs_context *fc) +{ + struct super_block *sb = fc->root->d_sb; + int ret; + + fc->s_fs_info = EXT4_SB(sb); + + ret = ext4_check_opt_consistency(fc, sb); + if (ret < 0) + return ret; + + ret = __ext4_remount(fc, sb); + if (ret < 0) + return ret; + + ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.", + &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w", + ext4_quota_mode(sb)); + + return 0; +} + +#ifdef CONFIG_QUOTA +static int ext4_statfs_project(struct super_block *sb, + kprojid_t projid, struct kstatfs *buf) +{ + struct kqid qid; + struct dquot *dquot; + u64 limit; + u64 curblock; + + qid = make_kqid_projid(projid); + dquot = dqget(sb, qid); + if (IS_ERR(dquot)) + return PTR_ERR(dquot); + spin_lock(&dquot->dq_dqb_lock); + + limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit, + dquot->dq_dqb.dqb_bhardlimit); + limit >>= sb->s_blocksize_bits; + + if (limit && buf->f_blocks > limit) { + curblock = (dquot->dq_dqb.dqb_curspace + + dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits; + buf->f_blocks = limit; + buf->f_bfree = buf->f_bavail = + (buf->f_blocks > curblock) ? + (buf->f_blocks - curblock) : 0; + } + + limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit, + dquot->dq_dqb.dqb_ihardlimit); + if (limit && buf->f_files > limit) { + buf->f_files = limit; + buf->f_ffree = + (buf->f_files > dquot->dq_dqb.dqb_curinodes) ? + (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0; + } + + spin_unlock(&dquot->dq_dqb_lock); + dqput(dquot); + return 0; +} +#endif + +static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + ext4_fsblk_t overhead = 0, resv_blocks; + s64 bfree; + resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); + + if (!test_opt(sb, MINIX_DF)) + overhead = sbi->s_overhead; + + buf->f_type = EXT4_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); + bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - + percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); + /* prevent underflow in case that few free space is available */ + buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); + buf->f_bavail = buf->f_bfree - + (ext4_r_blocks_count(es) + resv_blocks); + if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) + buf->f_bavail = 0; + buf->f_files = le32_to_cpu(es->s_inodes_count); + buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); + buf->f_namelen = EXT4_NAME_LEN; + buf->f_fsid = uuid_to_fsid(es->s_uuid); + +#ifdef CONFIG_QUOTA + if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) && + sb_has_quota_limits_enabled(sb, PRJQUOTA)) + ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf); +#endif + return 0; +} + + +#ifdef CONFIG_QUOTA + +/* + * Helper functions so that transaction is started before we acquire dqio_sem + * to keep correct lock ordering of transaction > dqio_sem + */ +static inline struct inode *dquot_to_inode(struct dquot *dquot) +{ + return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; +} + +static int ext4_write_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + struct inode *inode; + + inode = dquot_to_inode(dquot); + handle = ext4_journal_start(inode, EXT4_HT_QUOTA, + EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_acquire_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, + EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_acquire(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_release_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, + EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) { + /* Release dquot anyway to avoid endless cycle in dqput() */ + dquot_release(dquot); + return PTR_ERR(handle); + } + ret = dquot_release(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_mark_dquot_dirty(struct dquot *dquot) +{ + struct super_block *sb = dquot->dq_sb; + + if (ext4_is_quota_journalled(sb)) { + dquot_mark_dquot_dirty(dquot); + return ext4_write_dquot(dquot); + } else { + return dquot_mark_dquot_dirty(dquot); + } +} + +static int ext4_write_info(struct super_block *sb, int type) +{ + int ret, err; + handle_t *handle; + + /* Data block + inode block */ + handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit_info(sb, type); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static void lockdep_set_quota_inode(struct inode *inode, int subclass) +{ + struct ext4_inode_info *ei = EXT4_I(inode); + + /* The first argument of lockdep_set_subclass has to be + * *exactly* the same as the argument to init_rwsem() --- in + * this case, in init_once() --- or lockdep gets unhappy + * because the name of the lock is set using the + * stringification of the argument to init_rwsem(). + */ + (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */ + lockdep_set_subclass(&ei->i_data_sem, subclass); +} + +/* + * Standard function to be called on quota_on + */ +static int ext4_quota_on(struct super_block *sb, int type, int format_id, + const struct path *path) +{ + int err; + + if (!test_opt(sb, QUOTA)) + return -EINVAL; + + /* Quotafile not on the same filesystem? */ + if (path->dentry->d_sb != sb) + return -EXDEV; + + /* Quota already enabled for this file? */ + if (IS_NOQUOTA(d_inode(path->dentry))) + return -EBUSY; + + /* Journaling quota? */ + if (EXT4_SB(sb)->s_qf_names[type]) { + /* Quotafile not in fs root? */ + if (path->dentry->d_parent != sb->s_root) + ext4_msg(sb, KERN_WARNING, + "Quota file not on filesystem root. " + "Journaled quota will not work"); + sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY; + } else { + /* + * Clear the flag just in case mount options changed since + * last time. + */ + sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY; + } + + lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA); + err = dquot_quota_on(sb, type, format_id, path); + if (!err) { + struct inode *inode = d_inode(path->dentry); + handle_t *handle; + + /* + * Set inode flags to prevent userspace from messing with quota + * files. If this fails, we return success anyway since quotas + * are already enabled and this is not a hard failure. + */ + inode_lock(inode); + handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); + if (IS_ERR(handle)) + goto unlock_inode; + EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL; + inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, + S_NOATIME | S_IMMUTABLE); + err = ext4_mark_inode_dirty(handle, inode); + ext4_journal_stop(handle); + unlock_inode: + inode_unlock(inode); + if (err) + dquot_quota_off(sb, type); + } + if (err) + lockdep_set_quota_inode(path->dentry->d_inode, + I_DATA_SEM_NORMAL); + return err; +} + +static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum) +{ + switch (type) { + case USRQUOTA: + return qf_inum == EXT4_USR_QUOTA_INO; + case GRPQUOTA: + return qf_inum == EXT4_GRP_QUOTA_INO; + case PRJQUOTA: + return qf_inum >= EXT4_GOOD_OLD_FIRST_INO; + default: + BUG(); + } +} + +static int ext4_quota_enable(struct super_block *sb, int type, int format_id, + unsigned int flags) +{ + int err; + struct inode *qf_inode; + unsigned long qf_inums[EXT4_MAXQUOTAS] = { + le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) + }; + + BUG_ON(!ext4_has_feature_quota(sb)); + + if (!qf_inums[type]) + return -EPERM; + + if (!ext4_check_quota_inum(type, qf_inums[type])) { + ext4_error(sb, "Bad quota inum: %lu, type: %d", + qf_inums[type], type); + return -EUCLEAN; + } + + qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL); + if (IS_ERR(qf_inode)) { + ext4_error(sb, "Bad quota inode: %lu, type: %d", + qf_inums[type], type); + return PTR_ERR(qf_inode); + } + + /* Don't account quota for quota files to avoid recursion */ + qf_inode->i_flags |= S_NOQUOTA; + lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); + err = dquot_load_quota_inode(qf_inode, type, format_id, flags); + if (err) + lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); + iput(qf_inode); + + return err; +} + +/* Enable usage tracking for all quota types. */ +int ext4_enable_quotas(struct super_block *sb) +{ + int type, err = 0; + unsigned long qf_inums[EXT4_MAXQUOTAS] = { + le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) + }; + bool quota_mopt[EXT4_MAXQUOTAS] = { + test_opt(sb, USRQUOTA), + test_opt(sb, GRPQUOTA), + test_opt(sb, PRJQUOTA), + }; + + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; + for (type = 0; type < EXT4_MAXQUOTAS; type++) { + if (qf_inums[type]) { + err = ext4_quota_enable(sb, type, QFMT_VFS_V1, + DQUOT_USAGE_ENABLED | + (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0)); + if (err) { + ext4_warning(sb, + "Failed to enable quota tracking " + "(type=%d, err=%d, ino=%lu). " + "Please run e2fsck to fix.", type, + err, qf_inums[type]); + + ext4_quotas_off(sb, type); + return err; + } + } + } + return 0; +} + +static int ext4_quota_off(struct super_block *sb, int type) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + handle_t *handle; + int err; + + /* Force all delayed allocation blocks to be allocated. + * Caller already holds s_umount sem */ + if (test_opt(sb, DELALLOC)) + sync_filesystem(sb); + + if (!inode || !igrab(inode)) + goto out; + + err = dquot_quota_off(sb, type); + if (err || ext4_has_feature_quota(sb)) + goto out_put; + /* + * When the filesystem was remounted read-only first, we cannot cleanup + * inode flags here. Bad luck but people should be using QUOTA feature + * these days anyway. + */ + if (sb_rdonly(sb)) + goto out_put; + + inode_lock(inode); + /* + * Update modification times of quota files when userspace can + * start looking at them. If we fail, we return success anyway since + * this is not a hard failure and quotas are already disabled. + */ + handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + goto out_unlock; + } + EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL); + inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); + inode->i_mtime = inode_set_ctime_current(inode); + err = ext4_mark_inode_dirty(handle, inode); + ext4_journal_stop(handle); +out_unlock: + inode_unlock(inode); +out_put: + lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL); + iput(inode); + return err; +out: + return dquot_quota_off(sb, type); +} + +/* Read data from quotafile - avoid pagecache and such because we cannot afford + * acquiring the locks... As quota files are never truncated and quota code + * itself serializes the operations (and no one else should touch the files) + * we don't have to be afraid of races */ +static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t toread; + struct buffer_head *bh; + loff_t i_size = i_size_read(inode); + + if (off > i_size) + return 0; + if (off+len > i_size) + len = i_size-off; + toread = len; + while (toread > 0) { + tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread); + bh = ext4_bread(NULL, inode, blk, 0); + if (IS_ERR(bh)) + return PTR_ERR(bh); + if (!bh) /* A hole? */ + memset(data, 0, tocopy); + else + memcpy(data, bh->b_data+offset, tocopy); + brelse(bh); + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* Write to quotafile (we know the transaction is already started and has + * enough credits) */ +static ssize_t ext4_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); + int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1); + int retries = 0; + struct buffer_head *bh; + handle_t *handle = journal_current_handle(); + + if (!handle) { + ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" + " cancelled because transaction is not started", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + /* + * Since we account only one data block in transaction credits, + * then it is impossible to cross a block boundary. + */ + if (sb->s_blocksize - offset < len) { + ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" + " cancelled because not block aligned", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + + do { + bh = ext4_bread(handle, inode, blk, + EXT4_GET_BLOCKS_CREATE | + EXT4_GET_BLOCKS_METADATA_NOFAIL); + } while (PTR_ERR(bh) == -ENOSPC && + ext4_should_retry_alloc(inode->i_sb, &retries)); + if (IS_ERR(bh)) + return PTR_ERR(bh); + if (!bh) + goto out; + BUFFER_TRACE(bh, "get write access"); + err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE); + if (err) { + brelse(bh); + return err; + } + lock_buffer(bh); + memcpy(bh->b_data+offset, data, len); + flush_dcache_page(bh->b_page); + unlock_buffer(bh); + err = ext4_handle_dirty_metadata(handle, NULL, bh); + brelse(bh); +out: + if (inode->i_size < off + len) { + i_size_write(inode, off + len); + EXT4_I(inode)->i_disksize = inode->i_size; + err2 = ext4_mark_inode_dirty(handle, inode); + if (unlikely(err2 && !err)) + err = err2; + } + return err ? err : len; +} +#endif + +#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2) +static inline void register_as_ext2(void) +{ + int err = register_filesystem(&ext2_fs_type); + if (err) + printk(KERN_WARNING + "EXT4-fs: Unable to register as ext2 (%d)\n", err); +} + +static inline void unregister_as_ext2(void) +{ + unregister_filesystem(&ext2_fs_type); +} + +static inline int ext2_feature_set_ok(struct super_block *sb) +{ + if (ext4_has_unknown_ext2_incompat_features(sb)) + return 0; + if (sb_rdonly(sb)) + return 1; + if (ext4_has_unknown_ext2_ro_compat_features(sb)) + return 0; + return 1; +} +#else +static inline void register_as_ext2(void) { } +static inline void unregister_as_ext2(void) { } +static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } +#endif + +static inline void register_as_ext3(void) +{ + int err = register_filesystem(&ext3_fs_type); + if (err) + printk(KERN_WARNING + "EXT4-fs: Unable to register as ext3 (%d)\n", err); +} + +static inline void unregister_as_ext3(void) +{ + unregister_filesystem(&ext3_fs_type); +} + +static inline int ext3_feature_set_ok(struct super_block *sb) +{ + if (ext4_has_unknown_ext3_incompat_features(sb)) + return 0; + if (!ext4_has_feature_journal(sb)) + return 0; + if (sb_rdonly(sb)) + return 1; + if (ext4_has_unknown_ext3_ro_compat_features(sb)) + return 0; + return 1; +} + +static void ext4_kill_sb(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct block_device *journal_bdev = sbi ? sbi->s_journal_bdev : NULL; + + kill_block_super(sb); + + if (journal_bdev) + blkdev_put(journal_bdev, sb); +} + +static struct file_system_type ext4_fs_type = { + .owner = THIS_MODULE, + .name = "ext4", + .init_fs_context = ext4_init_fs_context, + .parameters = ext4_param_specs, + .kill_sb = ext4_kill_sb, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, +}; +MODULE_ALIAS_FS("ext4"); + +/* Shared across all ext4 file systems */ +wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; + +static int __init ext4_init_fs(void) +{ + int i, err; + + ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); + ext4_li_info = NULL; + + /* Build-time check for flags consistency */ + ext4_check_flag_values(); + + for (i = 0; i < EXT4_WQ_HASH_SZ; i++) + init_waitqueue_head(&ext4__ioend_wq[i]); + + err = ext4_init_es(); + if (err) + return err; + + err = ext4_init_pending(); + if (err) + goto out7; + + err = ext4_init_post_read_processing(); + if (err) + goto out6; + + err = ext4_init_pageio(); + if (err) + goto out5; + + err = ext4_init_system_zone(); + if (err) + goto out4; + + err = ext4_init_sysfs(); + if (err) + goto out3; + + err = ext4_init_mballoc(); + if (err) + goto out2; + err = init_inodecache(); + if (err) + goto out1; + + err = ext4_fc_init_dentry_cache(); + if (err) + goto out05; + + register_as_ext3(); + register_as_ext2(); + err = register_filesystem(&ext4_fs_type); + if (err) + goto out; + + return 0; +out: + unregister_as_ext2(); + unregister_as_ext3(); + ext4_fc_destroy_dentry_cache(); +out05: + destroy_inodecache(); +out1: + ext4_exit_mballoc(); +out2: + ext4_exit_sysfs(); +out3: + ext4_exit_system_zone(); +out4: + ext4_exit_pageio(); +out5: + ext4_exit_post_read_processing(); +out6: + ext4_exit_pending(); +out7: + ext4_exit_es(); + + return err; +} + +static void __exit ext4_exit_fs(void) +{ + ext4_destroy_lazyinit_thread(); + unregister_as_ext2(); + unregister_as_ext3(); + unregister_filesystem(&ext4_fs_type); + ext4_fc_destroy_dentry_cache(); + destroy_inodecache(); + ext4_exit_mballoc(); + ext4_exit_sysfs(); + ext4_exit_system_zone(); + ext4_exit_pageio(); + ext4_exit_post_read_processing(); + ext4_exit_es(); + ext4_exit_pending(); +} + +MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); +MODULE_DESCRIPTION("Fourth Extended Filesystem"); +MODULE_LICENSE("GPL"); +MODULE_SOFTDEP("pre: crc32c"); +module_init(ext4_init_fs) +module_exit(ext4_exit_fs) |