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Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 3853 |
1 files changed, 3853 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h new file mode 100644 index 000000000..72abb8d6c --- /dev/null +++ b/fs/ext4/ext4.h @@ -0,0 +1,3853 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ext4.h + * + * 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/include/linux/minix_fs.h + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#ifndef _EXT4_H +#define _EXT4_H + +#include <linux/refcount.h> +#include <linux/types.h> +#include <linux/blkdev.h> +#include <linux/magic.h> +#include <linux/jbd2.h> +#include <linux/quota.h> +#include <linux/rwsem.h> +#include <linux/rbtree.h> +#include <linux/seqlock.h> +#include <linux/mutex.h> +#include <linux/timer.h> +#include <linux/wait.h> +#include <linux/sched/signal.h> +#include <linux/blockgroup_lock.h> +#include <linux/percpu_counter.h> +#include <linux/ratelimit.h> +#include <crypto/hash.h> +#include <linux/falloc.h> +#include <linux/percpu-rwsem.h> +#include <linux/fiemap.h> +#ifdef __KERNEL__ +#include <linux/compat.h> +#endif + +#include <linux/fscrypt.h> +#include <linux/fsverity.h> + +#include <linux/compiler.h> + +/* + * The fourth extended filesystem constants/structures + */ + +/* + * with AGGRESSIVE_CHECK allocator runs consistency checks over + * structures. these checks slow things down a lot + */ +#define AGGRESSIVE_CHECK__ + +/* + * with DOUBLE_CHECK defined mballoc creates persistent in-core + * bitmaps, maintains and uses them to check for double allocations + */ +#define DOUBLE_CHECK__ + +/* + * Define EXT4FS_DEBUG to produce debug messages + */ +#undef EXT4FS_DEBUG + +/* + * Debug code + */ +#ifdef EXT4FS_DEBUG +#define ext4_debug(f, a...) \ + do { \ + printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ + __FILE__, __LINE__, __func__); \ + printk(KERN_DEBUG f, ## a); \ + } while (0) +#else +#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) +#endif + + /* + * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c + */ +#define EXT_DEBUG__ + +/* + * Dynamic printk for controlled extents debugging. + */ +#ifdef CONFIG_EXT4_DEBUG +#define ext_debug(ino, fmt, ...) \ + pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ + current->comm, task_pid_nr(current), \ + ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ + __func__, ##__VA_ARGS__) +#else +#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) +#endif + +#define ASSERT(assert) \ +do { \ + if (unlikely(!(assert))) { \ + printk(KERN_EMERG \ + "Assertion failure in %s() at %s:%d: '%s'\n", \ + __func__, __FILE__, __LINE__, #assert); \ + BUG(); \ + } \ +} while (0) + +/* data type for block offset of block group */ +typedef int ext4_grpblk_t; + +/* data type for filesystem-wide blocks number */ +typedef unsigned long long ext4_fsblk_t; + +/* data type for file logical block number */ +typedef __u32 ext4_lblk_t; + +/* data type for block group number */ +typedef unsigned int ext4_group_t; + +enum SHIFT_DIRECTION { + SHIFT_LEFT = 0, + SHIFT_RIGHT, +}; + +/* + * Flags used in mballoc's allocation_context flags field. + * + * Also used to show what's going on for debugging purposes when the + * flag field is exported via the traceport interface + */ + +/* prefer goal again. length */ +#define EXT4_MB_HINT_MERGE 0x0001 +/* blocks already reserved */ +#define EXT4_MB_HINT_RESERVED 0x0002 +/* metadata is being allocated */ +#define EXT4_MB_HINT_METADATA 0x0004 +/* first blocks in the file */ +#define EXT4_MB_HINT_FIRST 0x0008 +/* search for the best chunk */ +#define EXT4_MB_HINT_BEST 0x0010 +/* data is being allocated */ +#define EXT4_MB_HINT_DATA 0x0020 +/* don't preallocate (for tails) */ +#define EXT4_MB_HINT_NOPREALLOC 0x0040 +/* allocate for locality group */ +#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 +/* allocate goal blocks or none */ +#define EXT4_MB_HINT_GOAL_ONLY 0x0100 +/* goal is meaningful */ +#define EXT4_MB_HINT_TRY_GOAL 0x0200 +/* blocks already pre-reserved by delayed allocation */ +#define EXT4_MB_DELALLOC_RESERVED 0x0400 +/* We are doing stream allocation */ +#define EXT4_MB_STREAM_ALLOC 0x0800 +/* Use reserved root blocks if needed */ +#define EXT4_MB_USE_ROOT_BLOCKS 0x1000 +/* Use blocks from reserved pool */ +#define EXT4_MB_USE_RESERVED 0x2000 +/* Do strict check for free blocks while retrying block allocation */ +#define EXT4_MB_STRICT_CHECK 0x4000 +/* Large fragment size list lookup succeeded at least once for cr = 0 */ +#define EXT4_MB_CR0_OPTIMIZED 0x8000 +/* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ +#define EXT4_MB_CR1_OPTIMIZED 0x00010000 +struct ext4_allocation_request { + /* target inode for block we're allocating */ + struct inode *inode; + /* how many blocks we want to allocate */ + unsigned int len; + /* logical block in target inode */ + ext4_lblk_t logical; + /* the closest logical allocated block to the left */ + ext4_lblk_t lleft; + /* the closest logical allocated block to the right */ + ext4_lblk_t lright; + /* phys. target (a hint) */ + ext4_fsblk_t goal; + /* phys. block for the closest logical allocated block to the left */ + ext4_fsblk_t pleft; + /* phys. block for the closest logical allocated block to the right */ + ext4_fsblk_t pright; + /* flags. see above EXT4_MB_HINT_* */ + unsigned int flags; +}; + +/* + * Logical to physical block mapping, used by ext4_map_blocks() + * + * This structure is used to pass requests into ext4_map_blocks() as + * well as to store the information returned by ext4_map_blocks(). It + * takes less room on the stack than a struct buffer_head. + */ +#define EXT4_MAP_NEW BIT(BH_New) +#define EXT4_MAP_MAPPED BIT(BH_Mapped) +#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) +#define EXT4_MAP_BOUNDARY BIT(BH_Boundary) +#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ + EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) + +struct ext4_map_blocks { + ext4_fsblk_t m_pblk; + ext4_lblk_t m_lblk; + unsigned int m_len; + unsigned int m_flags; +}; + +/* + * Block validity checking, system zone rbtree. + */ +struct ext4_system_blocks { + struct rb_root root; + struct rcu_head rcu; +}; + +/* + * Flags for ext4_io_end->flags + */ +#define EXT4_IO_END_UNWRITTEN 0x0001 + +struct ext4_io_end_vec { + struct list_head list; /* list of io_end_vec */ + loff_t offset; /* offset in the file */ + ssize_t size; /* size of the extent */ +}; + +/* + * For converting unwritten extents on a work queue. 'handle' is used for + * buffered writeback. + */ +typedef struct ext4_io_end { + struct list_head list; /* per-file finished IO list */ + handle_t *handle; /* handle reserved for extent + * conversion */ + struct inode *inode; /* file being written to */ + struct bio *bio; /* Linked list of completed + * bios covering the extent */ + unsigned int flag; /* unwritten or not */ + refcount_t count; /* reference counter */ + struct list_head list_vec; /* list of ext4_io_end_vec */ +} ext4_io_end_t; + +struct ext4_io_submit { + struct writeback_control *io_wbc; + struct bio *io_bio; + ext4_io_end_t *io_end; + sector_t io_next_block; +}; + +/* + * Special inodes numbers + */ +#define EXT4_BAD_INO 1 /* Bad blocks inode */ +#define EXT4_ROOT_INO 2 /* Root inode */ +#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ +#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ +#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ +#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ +#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ +#define EXT4_JOURNAL_INO 8 /* Journal inode */ + +/* First non-reserved inode for old ext4 filesystems */ +#define EXT4_GOOD_OLD_FIRST_INO 11 + +/* + * Maximal count of links to a file + */ +#define EXT4_LINK_MAX 65000 + +/* + * Macro-instructions used to manage several block sizes + */ +#define EXT4_MIN_BLOCK_SIZE 1024 +#define EXT4_MAX_BLOCK_SIZE 65536 +#define EXT4_MIN_BLOCK_LOG_SIZE 10 +#define EXT4_MAX_BLOCK_LOG_SIZE 16 +#define EXT4_MAX_CLUSTER_LOG_SIZE 30 +#ifdef __KERNEL__ +# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) +#else +# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) +#endif +#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) +#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ + EXT4_SB(s)->s_cluster_bits) +#ifdef __KERNEL__ +# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) +# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) +#else +# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) +#endif +#ifdef __KERNEL__ +#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) +#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) +#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) +#else +#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ + EXT4_GOOD_OLD_INODE_SIZE : \ + (s)->s_inode_size) +#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ + EXT4_GOOD_OLD_FIRST_INO : \ + (s)->s_first_ino) +#endif +#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) +#define EXT4_MAX_BLOCKS(size, offset, blkbits) \ + ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ + blkbits)) + +/* Translate a block number to a cluster number */ +#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) +/* Translate a cluster number to a block number */ +#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) +/* Translate # of blks to # of clusters */ +#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ + (sbi)->s_cluster_bits) +/* Mask out the low bits to get the starting block of the cluster */ +#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ + ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) +#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ + ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) +/* Fill in the low bits to get the last block of the cluster */ +#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ + ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) +/* Get the cluster offset */ +#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ + ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) +#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ + ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) + +/* + * Structure of a blocks group descriptor + */ +struct ext4_group_desc +{ + __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ + __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ + __le32 bg_inode_table_lo; /* Inodes table block */ + __le16 bg_free_blocks_count_lo;/* Free blocks count */ + __le16 bg_free_inodes_count_lo;/* Free inodes count */ + __le16 bg_used_dirs_count_lo; /* Directories count */ + __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ + __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ + __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ + __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ + __le16 bg_itable_unused_lo; /* Unused inodes count */ + __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ + __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ + __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ + __le32 bg_inode_table_hi; /* Inodes table block MSB */ + __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ + __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ + __le16 bg_used_dirs_count_hi; /* Directories count MSB */ + __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ + __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ + __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ + __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ + __u32 bg_reserved; +}; + +#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ + (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ + sizeof(__le16)) +#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ + (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ + sizeof(__le16)) + +/* + * Structure of a flex block group info + */ + +struct flex_groups { + atomic64_t free_clusters; + atomic_t free_inodes; + atomic_t used_dirs; +}; + +#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ +#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ +#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ + +/* + * Macro-instructions used to manage group descriptors + */ +#define EXT4_MIN_DESC_SIZE 32 +#define EXT4_MIN_DESC_SIZE_64BIT 64 +#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE +#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) +#ifdef __KERNEL__ +# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) +# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) +# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) +# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) +# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) +#else +# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) +# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) +# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) +#endif + +/* + * Constants relative to the data blocks + */ +#define EXT4_NDIR_BLOCKS 12 +#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS +#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) +#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) +#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) + +/* + * Inode flags + */ +#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ +#define EXT4_UNRM_FL 0x00000002 /* Undelete */ +#define EXT4_COMPR_FL 0x00000004 /* Compress file */ +#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ +#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ +#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ +#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ +#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ +/* Reserved for compression usage... */ +#define EXT4_DIRTY_FL 0x00000100 +#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ +#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ + /* nb: was previously EXT2_ECOMPR_FL */ +#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ +/* End compression flags --- maybe not all used */ +#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ +#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ +#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ +#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ +#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ +#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ +#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ +#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ +#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ +#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ +/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ + +#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ + +#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ +#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ +#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ +#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ + +/* User modifiable flags */ +#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ + EXT4_UNRM_FL | \ + EXT4_COMPR_FL | \ + EXT4_SYNC_FL | \ + EXT4_IMMUTABLE_FL | \ + EXT4_APPEND_FL | \ + EXT4_NODUMP_FL | \ + EXT4_NOATIME_FL | \ + EXT4_JOURNAL_DATA_FL | \ + EXT4_NOTAIL_FL | \ + EXT4_DIRSYNC_FL | \ + EXT4_TOPDIR_FL | \ + EXT4_EXTENTS_FL | \ + 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ + EXT4_DAX_FL | \ + EXT4_PROJINHERIT_FL | \ + EXT4_CASEFOLD_FL) + +/* User visible flags */ +#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ + EXT4_DIRTY_FL | \ + EXT4_COMPRBLK_FL | \ + EXT4_NOCOMPR_FL | \ + EXT4_ENCRYPT_FL | \ + EXT4_INDEX_FL | \ + EXT4_VERITY_FL | \ + EXT4_INLINE_DATA_FL) + +/* Flags that should be inherited by new inodes from their parent. */ +#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ + EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ + EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ + EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ + EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ + EXT4_DAX_FL) + +/* Flags that are appropriate for regular files (all but dir-specific ones). */ +#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ + EXT4_PROJINHERIT_FL)) + +/* Flags that are appropriate for non-directories/regular files. */ +#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) + +/* The only flags that should be swapped */ +#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) + +/* Flags which are mutually exclusive to DAX */ +#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ + EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) + +/* Mask out flags that are inappropriate for the given type of inode. */ +static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) +{ + if (S_ISDIR(mode)) + return flags; + else if (S_ISREG(mode)) + return flags & EXT4_REG_FLMASK; + else + return flags & EXT4_OTHER_FLMASK; +} + +/* + * Inode flags used for atomic set/get + */ +enum { + EXT4_INODE_SECRM = 0, /* Secure deletion */ + EXT4_INODE_UNRM = 1, /* Undelete */ + EXT4_INODE_COMPR = 2, /* Compress file */ + EXT4_INODE_SYNC = 3, /* Synchronous updates */ + EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ + EXT4_INODE_APPEND = 5, /* writes to file may only append */ + EXT4_INODE_NODUMP = 6, /* do not dump file */ + EXT4_INODE_NOATIME = 7, /* do not update atime */ +/* Reserved for compression usage... */ + EXT4_INODE_DIRTY = 8, + EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ + EXT4_INODE_NOCOMPR = 10, /* Don't compress */ + EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ +/* End compression flags --- maybe not all used */ + EXT4_INODE_INDEX = 12, /* hash-indexed directory */ + EXT4_INODE_IMAGIC = 13, /* AFS directory */ + EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ + EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ + EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ + EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ + EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ + EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ + EXT4_INODE_VERITY = 20, /* Verity protected inode */ + EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ +/* 22 was formerly EXT4_INODE_EOFBLOCKS */ + EXT4_INODE_DAX = 25, /* Inode is DAX */ + EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ + EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ + EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ + EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ +}; + +/* + * Since it's pretty easy to mix up bit numbers and hex values, we use a + * build-time check to make sure that EXT4_XXX_FL is consistent with respect to + * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost + * any extra space in the compiled kernel image, otherwise, the build will fail. + * It's important that these values are the same, since we are using + * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent + * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk + * values found in ext2, ext3 and ext4 filesystems, and of course the values + * defined in e2fsprogs. + * + * It's not paranoia if the Murphy's Law really *is* out to get you. :-) + */ +#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) +#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) + +static inline void ext4_check_flag_values(void) +{ + CHECK_FLAG_VALUE(SECRM); + CHECK_FLAG_VALUE(UNRM); + CHECK_FLAG_VALUE(COMPR); + CHECK_FLAG_VALUE(SYNC); + CHECK_FLAG_VALUE(IMMUTABLE); + CHECK_FLAG_VALUE(APPEND); + CHECK_FLAG_VALUE(NODUMP); + CHECK_FLAG_VALUE(NOATIME); + CHECK_FLAG_VALUE(DIRTY); + CHECK_FLAG_VALUE(COMPRBLK); + CHECK_FLAG_VALUE(NOCOMPR); + CHECK_FLAG_VALUE(ENCRYPT); + CHECK_FLAG_VALUE(INDEX); + CHECK_FLAG_VALUE(IMAGIC); + CHECK_FLAG_VALUE(JOURNAL_DATA); + CHECK_FLAG_VALUE(NOTAIL); + CHECK_FLAG_VALUE(DIRSYNC); + CHECK_FLAG_VALUE(TOPDIR); + CHECK_FLAG_VALUE(HUGE_FILE); + CHECK_FLAG_VALUE(EXTENTS); + CHECK_FLAG_VALUE(VERITY); + CHECK_FLAG_VALUE(EA_INODE); + CHECK_FLAG_VALUE(INLINE_DATA); + CHECK_FLAG_VALUE(PROJINHERIT); + CHECK_FLAG_VALUE(CASEFOLD); + CHECK_FLAG_VALUE(RESERVED); +} + +/* Used to pass group descriptor data when online resize is done */ +struct ext4_new_group_input { + __u32 group; /* Group number for this data */ + __u64 block_bitmap; /* Absolute block number of block bitmap */ + __u64 inode_bitmap; /* Absolute block number of inode bitmap */ + __u64 inode_table; /* Absolute block number of inode table start */ + __u32 blocks_count; /* Total number of blocks in this group */ + __u16 reserved_blocks; /* Number of reserved blocks in this group */ + __u16 unused; +}; + +#if defined(__KERNEL__) && defined(CONFIG_COMPAT) +struct compat_ext4_new_group_input { + u32 group; + compat_u64 block_bitmap; + compat_u64 inode_bitmap; + compat_u64 inode_table; + u32 blocks_count; + u16 reserved_blocks; + u16 unused; +}; +#endif + +/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ +struct ext4_new_group_data { + __u32 group; + __u64 block_bitmap; + __u64 inode_bitmap; + __u64 inode_table; + __u32 blocks_count; + __u16 reserved_blocks; + __u16 mdata_blocks; + __u32 free_clusters_count; +}; + +/* Indexes used to index group tables in ext4_new_group_data */ +enum { + BLOCK_BITMAP = 0, /* block bitmap */ + INODE_BITMAP, /* inode bitmap */ + INODE_TABLE, /* inode tables */ + GROUP_TABLE_COUNT, +}; + +/* + * Flags used by ext4_map_blocks() + */ + /* Allocate any needed blocks and/or convert an unwritten + extent to be an initialized ext4 */ +#define EXT4_GET_BLOCKS_CREATE 0x0001 + /* Request the creation of an unwritten extent */ +#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 +#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ + EXT4_GET_BLOCKS_CREATE) + /* Caller is from the delayed allocation writeout path + * finally doing the actual allocation of delayed blocks */ +#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 + /* caller is from the direct IO path, request to creation of an + unwritten extents if not allocated, split the unwritten + extent if blocks has been preallocated already*/ +#define EXT4_GET_BLOCKS_PRE_IO 0x0008 +#define EXT4_GET_BLOCKS_CONVERT 0x0010 +#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ + EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) + /* Convert extent to initialized after IO complete */ +#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ + EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) + /* Eventual metadata allocation (due to growing extent tree) + * should not fail, so try to use reserved blocks for that.*/ +#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 + /* Don't normalize allocation size (used for fallocate) */ +#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 + /* Convert written extents to unwritten */ +#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 + /* Write zeros to newly created written extents */ +#define EXT4_GET_BLOCKS_ZERO 0x0200 +#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ + EXT4_GET_BLOCKS_ZERO) + /* Caller will submit data before dropping transaction handle. This + * allows jbd2 to avoid submitting data before commit. */ +#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 + /* Caller is in the atomic contex, find extent if it has been cached */ +#define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 + +/* + * The bit position of these flags must not overlap with any of the + * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), + * read_extent_tree_block(), ext4_split_extent_at(), + * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). + * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be + * caching the extents when reading from the extent tree while a + * truncate or punch hole operation is in progress. + */ +#define EXT4_EX_NOCACHE 0x40000000 +#define EXT4_EX_FORCE_CACHE 0x20000000 +#define EXT4_EX_NOFAIL 0x10000000 + +/* + * Flags used by ext4_free_blocks + */ +#define EXT4_FREE_BLOCKS_METADATA 0x0001 +#define EXT4_FREE_BLOCKS_FORGET 0x0002 +#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 +#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 +#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 +#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 +#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 + +/* + * ioctl commands + */ +#define EXT4_IOC_GETVERSION _IOR('f', 3, long) +#define EXT4_IOC_SETVERSION _IOW('f', 4, long) +#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION +#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION +#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) +#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) +#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) +#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) +#define EXT4_IOC_MIGRATE _IO('f', 9) + /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ + /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ +#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) +#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) +#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) +#define EXT4_IOC_SWAP_BOOT _IO('f', 17) +#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) +/* ioctl codes 19--39 are reserved for fscrypt */ +#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) +#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) +#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) +#define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) +#define EXT4_IOC_GETFSUUID _IOR('f', 44, struct fsuuid) +#define EXT4_IOC_SETFSUUID _IOW('f', 44, struct fsuuid) + +#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) + +/* + * Flags for going down operation + */ +#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ +#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ +#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ + +/* + * Flags returned by EXT4_IOC_GETSTATE + * + * We only expose to userspace a subset of the state flags in + * i_state_flags + */ +#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 +#define EXT4_STATE_FLAG_NEW 0x00000002 +#define EXT4_STATE_FLAG_NEWENTRY 0x00000004 +#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 + +/* flags for ioctl EXT4_IOC_CHECKPOINT */ +#define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 +#define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 +#define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 +#define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ + EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ + EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) + +/* + * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID + */ +struct fsuuid { + __u32 fsu_len; + __u32 fsu_flags; + __u8 fsu_uuid[]; +}; + +#if defined(__KERNEL__) && defined(CONFIG_COMPAT) +/* + * ioctl commands in 32 bit emulation + */ +#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) +#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) +#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) +#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) +#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) +#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) +#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION +#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION +#endif + +/* + * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. + * It indicates that the entry in extent status cache is for a hole. + */ +#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 + +/* Max physical block we can address w/o extents */ +#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF + +/* Max logical block we can support */ +#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE + +/* + * Structure of an inode on the disk + */ +struct ext4_inode { + __le16 i_mode; /* File mode */ + __le16 i_uid; /* Low 16 bits of Owner Uid */ + __le32 i_size_lo; /* Size in bytes */ + __le32 i_atime; /* Access time */ + __le32 i_ctime; /* Inode Change time */ + __le32 i_mtime; /* Modification time */ + __le32 i_dtime; /* Deletion Time */ + __le16 i_gid; /* Low 16 bits of Group Id */ + __le16 i_links_count; /* Links count */ + __le32 i_blocks_lo; /* Blocks count */ + __le32 i_flags; /* File flags */ + union { + struct { + __le32 l_i_version; + } linux1; + struct { + __u32 h_i_translator; + } hurd1; + struct { + __u32 m_i_reserved1; + } masix1; + } osd1; /* OS dependent 1 */ + __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ + __le32 i_generation; /* File version (for NFS) */ + __le32 i_file_acl_lo; /* File ACL */ + __le32 i_size_high; + __le32 i_obso_faddr; /* Obsoleted fragment address */ + union { + struct { + __le16 l_i_blocks_high; /* were l_i_reserved1 */ + __le16 l_i_file_acl_high; + __le16 l_i_uid_high; /* these 2 fields */ + __le16 l_i_gid_high; /* were reserved2[0] */ + __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ + __le16 l_i_reserved; + } linux2; + struct { + __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ + __u16 h_i_mode_high; + __u16 h_i_uid_high; + __u16 h_i_gid_high; + __u32 h_i_author; + } hurd2; + struct { + __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ + __le16 m_i_file_acl_high; + __u32 m_i_reserved2[2]; + } masix2; + } osd2; /* OS dependent 2 */ + __le16 i_extra_isize; + __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ + __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ + __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ + __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ + __le32 i_crtime; /* File Creation time */ + __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ + __le32 i_version_hi; /* high 32 bits for 64-bit version */ + __le32 i_projid; /* Project ID */ +}; + +struct move_extent { + __u32 reserved; /* should be zero */ + __u32 donor_fd; /* donor file descriptor */ + __u64 orig_start; /* logical start offset in block for orig */ + __u64 donor_start; /* logical start offset in block for donor */ + __u64 len; /* block length to be moved */ + __u64 moved_len; /* moved block length */ +}; + +#define EXT4_EPOCH_BITS 2 +#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) +#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) + +/* + * Extended fields will fit into an inode if the filesystem was formatted + * with large inodes (-I 256 or larger) and there are not currently any EAs + * consuming all of the available space. For new inodes we always reserve + * enough space for the kernel's known extended fields, but for inodes + * created with an old kernel this might not have been the case. None of + * the extended inode fields is critical for correct filesystem operation. + * This macro checks if a certain field fits in the inode. Note that + * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize + */ +#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ + ((offsetof(typeof(*ext4_inode), field) + \ + sizeof((ext4_inode)->field)) \ + <= (EXT4_GOOD_OLD_INODE_SIZE + \ + (einode)->i_extra_isize)) \ + +/* + * We use an encoding that preserves the times for extra epoch "00": + * + * extra msb of adjust for signed + * epoch 32-bit 32-bit tv_sec to + * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range + * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 + * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 + * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 + * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 + * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 + * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 + * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 + * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 + * + * Note that previous versions of the kernel on 64-bit systems would + * incorrectly use extra epoch bits 1,1 for dates between 1901 and + * 1970. e2fsck will correct this, assuming that it is run on the + * affected filesystem before 2242. + */ + +static inline __le32 ext4_encode_extra_time(struct timespec64 *time) +{ + u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; + return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); +} + +static inline void ext4_decode_extra_time(struct timespec64 *time, + __le32 extra) +{ + if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) + time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; + time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; +} + +#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ +do { \ + if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ + (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ + (raw_inode)->xtime ## _extra = \ + ext4_encode_extra_time(&(inode)->xtime); \ + } \ + else \ + (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ +} while (0) + +#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ +do { \ + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ + (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ + (raw_inode)->xtime ## _extra = \ + ext4_encode_extra_time(&(einode)->xtime); \ +} while (0) + +#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ +do { \ + (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ + if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ + ext4_decode_extra_time(&(inode)->xtime, \ + raw_inode->xtime ## _extra); \ + } \ + else \ + (inode)->xtime.tv_nsec = 0; \ +} while (0) + + +#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ +do { \ + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ + (einode)->xtime.tv_sec = \ + (signed)le32_to_cpu((raw_inode)->xtime); \ + else \ + (einode)->xtime.tv_sec = 0; \ + if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ + ext4_decode_extra_time(&(einode)->xtime, \ + raw_inode->xtime ## _extra); \ + else \ + (einode)->xtime.tv_nsec = 0; \ +} while (0) + +#define i_disk_version osd1.linux1.l_i_version + +#if defined(__KERNEL__) || defined(__linux__) +#define i_reserved1 osd1.linux1.l_i_reserved1 +#define i_file_acl_high osd2.linux2.l_i_file_acl_high +#define i_blocks_high osd2.linux2.l_i_blocks_high +#define i_uid_low i_uid +#define i_gid_low i_gid +#define i_uid_high osd2.linux2.l_i_uid_high +#define i_gid_high osd2.linux2.l_i_gid_high +#define i_checksum_lo osd2.linux2.l_i_checksum_lo + +#elif defined(__GNU__) + +#define i_translator osd1.hurd1.h_i_translator +#define i_uid_high osd2.hurd2.h_i_uid_high +#define i_gid_high osd2.hurd2.h_i_gid_high +#define i_author osd2.hurd2.h_i_author + +#elif defined(__masix__) + +#define i_reserved1 osd1.masix1.m_i_reserved1 +#define i_file_acl_high osd2.masix2.m_i_file_acl_high +#define i_reserved2 osd2.masix2.m_i_reserved2 + +#endif /* defined(__KERNEL__) || defined(__linux__) */ + +#include "extents_status.h" +#include "fast_commit.h" + +/* + * Lock subclasses for i_data_sem in the ext4_inode_info structure. + * + * These are needed to avoid lockdep false positives when we need to + * allocate blocks to the quota inode during ext4_map_blocks(), while + * holding i_data_sem for a normal (non-quota) inode. Since we don't + * do quota tracking for the quota inode, this avoids deadlock (as + * well as infinite recursion, since it isn't turtles all the way + * down...) + * + * I_DATA_SEM_NORMAL - Used for most inodes + * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode + * where the second inode has larger inode number + * than the first + * I_DATA_SEM_QUOTA - Used for quota inodes only + * I_DATA_SEM_EA - Used for ea_inodes only + */ +enum { + I_DATA_SEM_NORMAL = 0, + I_DATA_SEM_OTHER, + I_DATA_SEM_QUOTA, + I_DATA_SEM_EA +}; + + +/* + * fourth extended file system inode data in memory + */ +struct ext4_inode_info { + __le32 i_data[15]; /* unconverted */ + __u32 i_dtime; + ext4_fsblk_t i_file_acl; + + /* + * i_block_group is the number of the block group which contains + * this file's inode. Constant across the lifetime of the inode, + * it is used for making block allocation decisions - we try to + * place a file's data blocks near its inode block, and new inodes + * near to their parent directory's inode. + */ + ext4_group_t i_block_group; + ext4_lblk_t i_dir_start_lookup; +#if (BITS_PER_LONG < 64) + unsigned long i_state_flags; /* Dynamic state flags */ +#endif + unsigned long i_flags; + + /* + * Extended attributes can be read independently of the main file + * data. Taking i_rwsem even when reading would cause contention + * between readers of EAs and writers of regular file data, so + * instead we synchronize on xattr_sem when reading or changing + * EAs. + */ + struct rw_semaphore xattr_sem; + + /* + * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise + * i_orphan is used. + */ + union { + struct list_head i_orphan; /* unlinked but open inodes */ + unsigned int i_orphan_idx; /* Index in orphan file */ + }; + + /* Fast commit related info */ + + /* For tracking dentry create updates */ + struct list_head i_fc_dilist; + struct list_head i_fc_list; /* + * inodes that need fast commit + * protected by sbi->s_fc_lock. + */ + + /* Start of lblk range that needs to be committed in this fast commit */ + ext4_lblk_t i_fc_lblk_start; + + /* End of lblk range that needs to be committed in this fast commit */ + ext4_lblk_t i_fc_lblk_len; + + /* Number of ongoing updates on this inode */ + atomic_t i_fc_updates; + + /* Fast commit wait queue for this inode */ + wait_queue_head_t i_fc_wait; + + /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ + struct mutex i_fc_lock; + + /* + * i_disksize keeps track of what the inode size is ON DISK, not + * in memory. During truncate, i_size is set to the new size by + * the VFS prior to calling ext4_truncate(), but the filesystem won't + * set i_disksize to 0 until the truncate is actually under way. + * + * The intent is that i_disksize always represents the blocks which + * are used by this file. This allows recovery to restart truncate + * on orphans if we crash during truncate. We actually write i_disksize + * into the on-disk inode when writing inodes out, instead of i_size. + * + * The only time when i_disksize and i_size may be different is when + * a truncate is in progress. The only things which change i_disksize + * are ext4_get_block (growth) and ext4_truncate (shrinkth). + */ + loff_t i_disksize; + + /* + * i_data_sem is for serialising ext4_truncate() against + * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's + * data tree are chopped off during truncate. We can't do that in + * ext4 because whenever we perform intermediate commits during + * truncate, the inode and all the metadata blocks *must* be in a + * consistent state which allows truncation of the orphans to restart + * during recovery. Hence we must fix the get_block-vs-truncate race + * by other means, so we have i_data_sem. + */ + struct rw_semaphore i_data_sem; + struct inode vfs_inode; + struct jbd2_inode *jinode; + + spinlock_t i_raw_lock; /* protects updates to the raw inode */ + + /* + * File creation time. Its function is same as that of + * struct timespec64 i_{a,c,m}time in the generic inode. + */ + struct timespec64 i_crtime; + + /* mballoc */ + atomic_t i_prealloc_active; + struct list_head i_prealloc_list; + spinlock_t i_prealloc_lock; + + /* extents status tree */ + struct ext4_es_tree i_es_tree; + rwlock_t i_es_lock; + struct list_head i_es_list; + unsigned int i_es_all_nr; /* protected by i_es_lock */ + unsigned int i_es_shk_nr; /* protected by i_es_lock */ + ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for + extents to shrink. Protected by + i_es_lock */ + + /* ialloc */ + ext4_group_t i_last_alloc_group; + + /* allocation reservation info for delalloc */ + /* In case of bigalloc, this refer to clusters rather than blocks */ + unsigned int i_reserved_data_blocks; + + /* pending cluster reservations for bigalloc file systems */ + struct ext4_pending_tree i_pending_tree; + + /* on-disk additional length */ + __u16 i_extra_isize; + + /* Indicate the inline data space. */ + u16 i_inline_off; + u16 i_inline_size; + +#ifdef CONFIG_QUOTA + /* quota space reservation, managed internally by quota code */ + qsize_t i_reserved_quota; +#endif + + /* Lock protecting lists below */ + spinlock_t i_completed_io_lock; + /* + * Completed IOs that need unwritten extents handling and have + * transaction reserved + */ + struct list_head i_rsv_conversion_list; + struct work_struct i_rsv_conversion_work; + atomic_t i_unwritten; /* Nr. of inflight conversions pending */ + + spinlock_t i_block_reservation_lock; + + /* + * Transactions that contain inode's metadata needed to complete + * fsync and fdatasync, respectively. + */ + tid_t i_sync_tid; + tid_t i_datasync_tid; + +#ifdef CONFIG_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif + + /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ + __u32 i_csum_seed; + + kprojid_t i_projid; +}; + +/* + * File system states + */ +#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ +#define EXT4_ERROR_FS 0x0002 /* Errors detected */ +#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ +#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ + +/* + * Misc. filesystem flags + */ +#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ +#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ +#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ + +/* + * Mount flags set via mount options or defaults + */ +#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ +#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ +#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ +#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ +#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ +#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ +#define EXT4_MOUNT_ERRORS_MASK 0x00070 +#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ +#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ +#ifdef CONFIG_FS_DAX +#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ +#else +#define EXT4_MOUNT_DAX_ALWAYS 0 +#endif +#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ +#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ +#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ +#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ +#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ +#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ +#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ +#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ +#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ +#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ +#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ +#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, + * enable enforcement for hidden + * quota files */ +#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable + * enforcement for hidden quota + * files */ +#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota + * enforcement */ +#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ +#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ +#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ +#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ +#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 +#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ +#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ +#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ +#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ +#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ + +/* + * Mount flags set either automatically (could not be set by mount option) + * based on per file system feature or property or in special cases such as + * distinguishing between explicit mount option definition and default. + */ +#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly + specified delalloc */ +#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group + size of blocksize * 8 + blocks */ +#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated + file systems */ +#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly + specified journal checksum */ + +#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ +#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ +#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ +#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group + * scanning in mballoc + */ + +#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ + ~EXT4_MOUNT_##opt +#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ + EXT4_MOUNT_##opt +#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ + EXT4_MOUNT_##opt) + +#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ + ~EXT4_MOUNT2_##opt +#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ + EXT4_MOUNT2_##opt +#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ + EXT4_MOUNT2_##opt) + +#define ext4_test_and_set_bit __test_and_set_bit_le +#define ext4_set_bit __set_bit_le +#define ext4_set_bit_atomic ext2_set_bit_atomic +#define ext4_test_and_clear_bit __test_and_clear_bit_le +#define ext4_clear_bit __clear_bit_le +#define ext4_clear_bit_atomic ext2_clear_bit_atomic +#define ext4_test_bit test_bit_le +#define ext4_find_next_zero_bit find_next_zero_bit_le +#define ext4_find_next_bit find_next_bit_le + +extern void mb_set_bits(void *bm, int cur, int len); + +/* + * Maximal mount counts between two filesystem checks + */ +#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ +#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ + +/* + * Behaviour when detecting errors + */ +#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ +#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ +#define EXT4_ERRORS_PANIC 3 /* Panic */ +#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE + +/* Metadata checksum algorithm codes */ +#define EXT4_CRC32C_CHKSUM 1 + +#define EXT4_LABEL_MAX 16 + +/* + * Structure of the super block + */ +struct ext4_super_block { +/*00*/ __le32 s_inodes_count; /* Inodes count */ + __le32 s_blocks_count_lo; /* Blocks count */ + __le32 s_r_blocks_count_lo; /* Reserved blocks count */ + __le32 s_free_blocks_count_lo; /* Free blocks count */ +/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ + __le32 s_first_data_block; /* First Data Block */ + __le32 s_log_block_size; /* Block size */ + __le32 s_log_cluster_size; /* Allocation cluster size */ +/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ + __le32 s_clusters_per_group; /* # Clusters per group */ + __le32 s_inodes_per_group; /* # Inodes per group */ + __le32 s_mtime; /* Mount time */ +/*30*/ __le32 s_wtime; /* Write time */ + __le16 s_mnt_count; /* Mount count */ + __le16 s_max_mnt_count; /* Maximal mount count */ + __le16 s_magic; /* Magic signature */ + __le16 s_state; /* File system state */ + __le16 s_errors; /* Behaviour when detecting errors */ + __le16 s_minor_rev_level; /* minor revision level */ +/*40*/ __le32 s_lastcheck; /* time of last check */ + __le32 s_checkinterval; /* max. time between checks */ + __le32 s_creator_os; /* OS */ + __le32 s_rev_level; /* Revision level */ +/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ + __le16 s_def_resgid; /* Default gid for reserved blocks */ + /* + * These fields are for EXT4_DYNAMIC_REV superblocks only. + * + * Note: the difference between the compatible feature set and + * the incompatible feature set is that if there is a bit set + * in the incompatible feature set that the kernel doesn't + * know about, it should refuse to mount the filesystem. + * + * e2fsck's requirements are more strict; if it doesn't know + * about a feature in either the compatible or incompatible + * feature set, it must abort and not try to meddle with + * things it doesn't understand... + */ + __le32 s_first_ino; /* First non-reserved inode */ + __le16 s_inode_size; /* size of inode structure */ + __le16 s_block_group_nr; /* block group # of this superblock */ + __le32 s_feature_compat; /* compatible feature set */ +/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ + __le32 s_feature_ro_compat; /* readonly-compatible feature set */ +/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ +/*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ +/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ +/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ + /* + * Performance hints. Directory preallocation should only + * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. + */ + __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ + __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ + __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ + /* + * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. + */ +/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ +/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ + __le32 s_journal_dev; /* device number of journal file */ + __le32 s_last_orphan; /* start of list of inodes to delete */ + __le32 s_hash_seed[4]; /* HTREE hash seed */ + __u8 s_def_hash_version; /* Default hash version to use */ + __u8 s_jnl_backup_type; + __le16 s_desc_size; /* size of group descriptor */ +/*100*/ __le32 s_default_mount_opts; + __le32 s_first_meta_bg; /* First metablock block group */ + __le32 s_mkfs_time; /* When the filesystem was created */ + __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ + /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ +/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ + __le32 s_r_blocks_count_hi; /* Reserved blocks count */ + __le32 s_free_blocks_count_hi; /* Free blocks count */ + __le16 s_min_extra_isize; /* All inodes have at least # bytes */ + __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ + __le32 s_flags; /* Miscellaneous flags */ + __le16 s_raid_stride; /* RAID stride */ + __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ + __le64 s_mmp_block; /* Block for multi-mount protection */ + __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ + __u8 s_log_groups_per_flex; /* FLEX_BG group size */ + __u8 s_checksum_type; /* metadata checksum algorithm used */ + __u8 s_encryption_level; /* versioning level for encryption */ + __u8 s_reserved_pad; /* Padding to next 32bits */ + __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ + __le32 s_snapshot_inum; /* Inode number of active snapshot */ + __le32 s_snapshot_id; /* sequential ID of active snapshot */ + __le64 s_snapshot_r_blocks_count; /* reserved blocks for active + snapshot's future use */ + __le32 s_snapshot_list; /* inode number of the head of the + on-disk snapshot list */ +#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) + __le32 s_error_count; /* number of fs errors */ + __le32 s_first_error_time; /* first time an error happened */ + __le32 s_first_error_ino; /* inode involved in first error */ + __le64 s_first_error_block; /* block involved of first error */ + __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ + __le32 s_first_error_line; /* line number where error happened */ + __le32 s_last_error_time; /* most recent time of an error */ + __le32 s_last_error_ino; /* inode involved in last error */ + __le32 s_last_error_line; /* line number where error happened */ + __le64 s_last_error_block; /* block involved of last error */ + __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ +#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) + __u8 s_mount_opts[64]; + __le32 s_usr_quota_inum; /* inode for tracking user quota */ + __le32 s_grp_quota_inum; /* inode for tracking group quota */ + __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ + __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ + __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ + __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ + __le32 s_lpf_ino; /* Location of the lost+found inode */ + __le32 s_prj_quota_inum; /* inode for tracking project quota */ + __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ + __u8 s_wtime_hi; + __u8 s_mtime_hi; + __u8 s_mkfs_time_hi; + __u8 s_lastcheck_hi; + __u8 s_first_error_time_hi; + __u8 s_last_error_time_hi; + __u8 s_first_error_errcode; + __u8 s_last_error_errcode; + __le16 s_encoding; /* Filename charset encoding */ + __le16 s_encoding_flags; /* Filename charset encoding flags */ + __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ + __le32 s_reserved[94]; /* Padding to the end of the block */ + __le32 s_checksum; /* crc32c(superblock) */ +}; + +#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) + +#ifdef __KERNEL__ + +/* Number of quota types we support */ +#define EXT4_MAXQUOTAS 3 + +#define EXT4_ENC_UTF8_12_1 1 + +/* Types of ext4 journal triggers */ +enum ext4_journal_trigger_type { + EXT4_JTR_ORPHAN_FILE, + EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ +}; + +#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE + +struct ext4_journal_trigger { + struct jbd2_buffer_trigger_type tr_triggers; + struct super_block *sb; +}; + +static inline struct ext4_journal_trigger *EXT4_TRIGGER( + struct jbd2_buffer_trigger_type *trigger) +{ + return container_of(trigger, struct ext4_journal_trigger, tr_triggers); +} + +#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 + +/* Structure at the tail of orphan block */ +struct ext4_orphan_block_tail { + __le32 ob_magic; + __le32 ob_checksum; +}; + +static inline int ext4_inodes_per_orphan_block(struct super_block *sb) +{ + return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / + sizeof(u32); +} + +struct ext4_orphan_block { + atomic_t ob_free_entries; /* Number of free orphan entries in block */ + struct buffer_head *ob_bh; /* Buffer for orphan block */ +}; + +/* + * Info about orphan file. + */ +struct ext4_orphan_info { + int of_blocks; /* Number of orphan blocks in a file */ + __u32 of_csum_seed; /* Checksum seed for orphan file */ + struct ext4_orphan_block *of_binfo; /* Array with info about orphan + * file blocks */ +}; + +/* + * fourth extended-fs super-block data in memory + */ +struct ext4_sb_info { + unsigned long s_desc_size; /* Size of a group descriptor in bytes */ + unsigned long s_inodes_per_block;/* Number of inodes per block */ + unsigned long s_blocks_per_group;/* Number of blocks in a group */ + unsigned long s_clusters_per_group; /* Number of clusters in a group */ + unsigned long s_inodes_per_group;/* Number of inodes in a group */ + unsigned long s_itb_per_group; /* Number of inode table blocks per group */ + unsigned long s_gdb_count; /* Number of group descriptor blocks */ + unsigned long s_desc_per_block; /* Number of group descriptors per block */ + ext4_group_t s_groups_count; /* Number of groups in the fs */ + ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ + unsigned long s_overhead; /* # of fs overhead clusters */ + unsigned int s_cluster_ratio; /* Number of blocks per cluster */ + unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ + loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ + struct buffer_head * s_sbh; /* Buffer containing the super block */ + struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ + struct buffer_head * __rcu *s_group_desc; + unsigned int s_mount_opt; + unsigned int s_mount_opt2; + unsigned long s_mount_flags; + unsigned int s_def_mount_opt; + unsigned int s_def_mount_opt2; + ext4_fsblk_t s_sb_block; + atomic64_t s_resv_clusters; + kuid_t s_resuid; + kgid_t s_resgid; + unsigned short s_mount_state; + unsigned short s_pad; + int s_addr_per_block_bits; + int s_desc_per_block_bits; + int s_inode_size; + int s_first_ino; + unsigned int s_inode_readahead_blks; + unsigned int s_inode_goal; + u32 s_hash_seed[4]; + int s_def_hash_version; + int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ + struct percpu_counter s_freeclusters_counter; + struct percpu_counter s_freeinodes_counter; + struct percpu_counter s_dirs_counter; + struct percpu_counter s_dirtyclusters_counter; + struct percpu_counter s_sra_exceeded_retry_limit; + struct blockgroup_lock *s_blockgroup_lock; + struct proc_dir_entry *s_proc; + struct kobject s_kobj; + struct completion s_kobj_unregister; + struct super_block *s_sb; + struct buffer_head *s_mmp_bh; + + /* Journaling */ + struct journal_s *s_journal; + unsigned long s_ext4_flags; /* Ext4 superblock flags */ + struct mutex s_orphan_lock; /* Protects on disk list changes */ + struct list_head s_orphan; /* List of orphaned inodes in on disk + list */ + struct ext4_orphan_info s_orphan_info; + unsigned long s_commit_interval; + u32 s_max_batch_time; + u32 s_min_batch_time; + struct block_device *s_journal_bdev; +#ifdef CONFIG_QUOTA + /* Names of quota files with journalled quota */ + char __rcu *s_qf_names[EXT4_MAXQUOTAS]; + int s_jquota_fmt; /* Format of quota to use */ +#endif + unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ + struct ext4_system_blocks __rcu *s_system_blks; + +#ifdef EXTENTS_STATS + /* ext4 extents stats */ + unsigned long s_ext_min; + unsigned long s_ext_max; + unsigned long s_depth_max; + spinlock_t s_ext_stats_lock; + unsigned long s_ext_blocks; + unsigned long s_ext_extents; +#endif + + /* for buddy allocator */ + struct ext4_group_info ** __rcu *s_group_info; + struct inode *s_buddy_cache; + spinlock_t s_md_lock; + unsigned short *s_mb_offsets; + unsigned int *s_mb_maxs; + unsigned int s_group_info_size; + unsigned int s_mb_free_pending; + struct list_head s_freed_data_list; /* List of blocks to be freed + after commit completed */ + struct list_head s_discard_list; + struct work_struct s_discard_work; + atomic_t s_retry_alloc_pending; + struct list_head *s_mb_avg_fragment_size; + rwlock_t *s_mb_avg_fragment_size_locks; + struct list_head *s_mb_largest_free_orders; + rwlock_t *s_mb_largest_free_orders_locks; + + /* tunables */ + unsigned long s_stripe; + unsigned int s_mb_max_linear_groups; + unsigned int s_mb_stream_request; + unsigned int s_mb_max_to_scan; + unsigned int s_mb_min_to_scan; + unsigned int s_mb_stats; + unsigned int s_mb_order2_reqs; + unsigned int s_mb_group_prealloc; + unsigned int s_mb_max_inode_prealloc; + unsigned int s_max_dir_size_kb; + /* where last allocation was done - for stream allocation */ + unsigned long s_mb_last_group; + unsigned long s_mb_last_start; + unsigned int s_mb_prefetch; + unsigned int s_mb_prefetch_limit; + + /* stats for buddy allocator */ + atomic_t s_bal_reqs; /* number of reqs with len > 1 */ + atomic_t s_bal_success; /* we found long enough chunks */ + atomic_t s_bal_allocated; /* in blocks */ + atomic_t s_bal_ex_scanned; /* total extents scanned */ + atomic_t s_bal_groups_scanned; /* number of groups scanned */ + atomic_t s_bal_goals; /* goal hits */ + atomic_t s_bal_breaks; /* too long searches */ + atomic_t s_bal_2orders; /* 2^order hits */ + atomic_t s_bal_cr0_bad_suggestions; + atomic_t s_bal_cr1_bad_suggestions; + atomic64_t s_bal_cX_groups_considered[4]; + atomic64_t s_bal_cX_hits[4]; + atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ + atomic_t s_mb_buddies_generated; /* number of buddies generated */ + atomic64_t s_mb_generation_time; + atomic_t s_mb_lost_chunks; + atomic_t s_mb_preallocated; + atomic_t s_mb_discarded; + atomic_t s_lock_busy; + + /* locality groups */ + struct ext4_locality_group __percpu *s_locality_groups; + + /* for write statistics */ + unsigned long s_sectors_written_start; + u64 s_kbytes_written; + + /* the size of zero-out chunk */ + unsigned int s_extent_max_zeroout_kb; + + unsigned int s_log_groups_per_flex; + struct flex_groups * __rcu *s_flex_groups; + ext4_group_t s_flex_groups_allocated; + + /* workqueue for reserved extent conversions (buffered io) */ + struct workqueue_struct *rsv_conversion_wq; + + /* timer for periodic error stats printing */ + struct timer_list s_err_report; + + /* Lazy inode table initialization info */ + struct ext4_li_request *s_li_request; + /* Wait multiplier for lazy initialization thread */ + unsigned int s_li_wait_mult; + + /* Kernel thread for multiple mount protection */ + struct task_struct *s_mmp_tsk; + + /* record the last minlen when FITRIM is called. */ + unsigned long s_last_trim_minblks; + + /* Reference to checksum algorithm driver via cryptoapi */ + struct crypto_shash *s_chksum_driver; + + /* Precomputed FS UUID checksum for seeding other checksums */ + __u32 s_csum_seed; + + /* Reclaim extents from extent status tree */ + struct shrinker s_es_shrinker; + struct list_head s_es_list; /* List of inodes with reclaimable extents */ + long s_es_nr_inode; + struct ext4_es_stats s_es_stats; + struct mb_cache *s_ea_block_cache; + struct mb_cache *s_ea_inode_cache; + spinlock_t s_es_lock ____cacheline_aligned_in_smp; + + /* Journal triggers for checksum computation */ + struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; + + /* Ratelimit ext4 messages. */ + struct ratelimit_state s_err_ratelimit_state; + struct ratelimit_state s_warning_ratelimit_state; + struct ratelimit_state s_msg_ratelimit_state; + atomic_t s_warning_count; + atomic_t s_msg_count; + + /* Encryption policy for '-o test_dummy_encryption' */ + struct fscrypt_dummy_policy s_dummy_enc_policy; + + /* + * Barrier between writepages ops and changing any inode's JOURNAL_DATA + * or EXTENTS flag. + */ + struct percpu_rw_semaphore s_writepages_rwsem; + struct dax_device *s_daxdev; + u64 s_dax_part_off; +#ifdef CONFIG_EXT4_DEBUG + unsigned long s_simulate_fail; +#endif + /* Record the errseq of the backing block device */ + errseq_t s_bdev_wb_err; + spinlock_t s_bdev_wb_lock; + + /* Information about errors that happened during this mount */ + spinlock_t s_error_lock; + int s_add_error_count; + int s_first_error_code; + __u32 s_first_error_line; + __u32 s_first_error_ino; + __u64 s_first_error_block; + const char *s_first_error_func; + time64_t s_first_error_time; + int s_last_error_code; + __u32 s_last_error_line; + __u32 s_last_error_ino; + __u64 s_last_error_block; + const char *s_last_error_func; + time64_t s_last_error_time; + /* + * If we are in a context where we cannot update error information in + * the on-disk superblock, we queue this work to do it. + */ + struct work_struct s_error_work; + + /* Ext4 fast commit sub transaction ID */ + atomic_t s_fc_subtid; + + /* + * After commit starts, the main queue gets locked, and the further + * updates get added in the staging queue. + */ +#define FC_Q_MAIN 0 +#define FC_Q_STAGING 1 + struct list_head s_fc_q[2]; /* Inodes staged for fast commit + * that have data changes in them. + */ + struct list_head s_fc_dentry_q[2]; /* directory entry updates */ + unsigned int s_fc_bytes; + /* + * Main fast commit lock. This lock protects accesses to the + * following fields: + * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. + */ + spinlock_t s_fc_lock; + struct buffer_head *s_fc_bh; + struct ext4_fc_stats s_fc_stats; + tid_t s_fc_ineligible_tid; +#ifdef CONFIG_EXT4_DEBUG + int s_fc_debug_max_replay; +#endif + struct ext4_fc_replay_state s_fc_replay_state; +}; + +static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) +{ + return sb->s_fs_info; +} +static inline struct ext4_inode_info *EXT4_I(struct inode *inode) +{ + return container_of(inode, struct ext4_inode_info, vfs_inode); +} + +static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) +{ + return ino == EXT4_ROOT_INO || + (ino >= EXT4_FIRST_INO(sb) && + ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); +} + +/* + * Returns: sbi->field[index] + * Used to access an array element from the following sbi fields which require + * rcu protection to avoid dereferencing an invalid pointer due to reassignment + * - s_group_desc + * - s_group_info + * - s_flex_group + */ +#define sbi_array_rcu_deref(sbi, field, index) \ +({ \ + typeof(*((sbi)->field)) _v; \ + rcu_read_lock(); \ + _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ + rcu_read_unlock(); \ + _v; \ +}) + +/* + * run-time mount flags + */ +enum { + EXT4_MF_MNTDIR_SAMPLED, + EXT4_MF_FS_ABORTED, /* Fatal error detected */ + EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ +}; + +static inline void ext4_set_mount_flag(struct super_block *sb, int bit) +{ + set_bit(bit, &EXT4_SB(sb)->s_mount_flags); +} + +static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) +{ + clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); +} + +static inline int ext4_test_mount_flag(struct super_block *sb, int bit) +{ + return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); +} + + +/* + * Simulate_fail codes + */ +#define EXT4_SIM_BBITMAP_EIO 1 +#define EXT4_SIM_BBITMAP_CRC 2 +#define EXT4_SIM_IBITMAP_EIO 3 +#define EXT4_SIM_IBITMAP_CRC 4 +#define EXT4_SIM_INODE_EIO 5 +#define EXT4_SIM_INODE_CRC 6 +#define EXT4_SIM_DIRBLOCK_EIO 7 +#define EXT4_SIM_DIRBLOCK_CRC 8 + +static inline bool ext4_simulate_fail(struct super_block *sb, + unsigned long code) +{ +#ifdef CONFIG_EXT4_DEBUG + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (unlikely(sbi->s_simulate_fail == code)) { + sbi->s_simulate_fail = 0; + return true; + } +#endif + return false; +} + +static inline void ext4_simulate_fail_bh(struct super_block *sb, + struct buffer_head *bh, + unsigned long code) +{ + if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) + clear_buffer_uptodate(bh); +} + +/* + * Error number codes for s_{first,last}_error_errno + * + * Linux errno numbers are architecture specific, so we need to translate + * them into something which is architecture independent. We don't define + * codes for all errno's; just the ones which are most likely to be the cause + * of an ext4_error() call. + */ +#define EXT4_ERR_UNKNOWN 1 +#define EXT4_ERR_EIO 2 +#define EXT4_ERR_ENOMEM 3 +#define EXT4_ERR_EFSBADCRC 4 +#define EXT4_ERR_EFSCORRUPTED 5 +#define EXT4_ERR_ENOSPC 6 +#define EXT4_ERR_ENOKEY 7 +#define EXT4_ERR_EROFS 8 +#define EXT4_ERR_EFBIG 9 +#define EXT4_ERR_EEXIST 10 +#define EXT4_ERR_ERANGE 11 +#define EXT4_ERR_EOVERFLOW 12 +#define EXT4_ERR_EBUSY 13 +#define EXT4_ERR_ENOTDIR 14 +#define EXT4_ERR_ENOTEMPTY 15 +#define EXT4_ERR_ESHUTDOWN 16 +#define EXT4_ERR_EFAULT 17 + +/* + * Inode dynamic state flags + */ +enum { + EXT4_STATE_JDATA, /* journaled data exists */ + EXT4_STATE_NEW, /* inode is newly created */ + EXT4_STATE_XATTR, /* has in-inode xattrs */ + EXT4_STATE_NO_EXPAND, /* No space for expansion */ + EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ + EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ + EXT4_STATE_NEWENTRY, /* File just added to dir */ + EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ + EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ + EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ + EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ + EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ + EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ +}; + +#define EXT4_INODE_BIT_FNS(name, field, offset) \ +static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ +{ \ + return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ +} \ +static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ +{ \ + set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ +} \ +static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ +{ \ + clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ +} + +/* Add these declarations here only so that these functions can be + * found by name. Otherwise, they are very hard to locate. */ +static inline int ext4_test_inode_flag(struct inode *inode, int bit); +static inline void ext4_set_inode_flag(struct inode *inode, int bit); +static inline void ext4_clear_inode_flag(struct inode *inode, int bit); +EXT4_INODE_BIT_FNS(flag, flags, 0) + +/* Add these declarations here only so that these functions can be + * found by name. Otherwise, they are very hard to locate. */ +static inline int ext4_test_inode_state(struct inode *inode, int bit); +static inline void ext4_set_inode_state(struct inode *inode, int bit); +static inline void ext4_clear_inode_state(struct inode *inode, int bit); +#if (BITS_PER_LONG < 64) +EXT4_INODE_BIT_FNS(state, state_flags, 0) + +static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) +{ + (ei)->i_state_flags = 0; +} +#else +EXT4_INODE_BIT_FNS(state, flags, 32) + +static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) +{ + /* We depend on the fact that callers will set i_flags */ +} +#endif +#else +/* Assume that user mode programs are passing in an ext4fs superblock, not + * a kernel struct super_block. This will allow us to call the feature-test + * macros from user land. */ +#define EXT4_SB(sb) (sb) +#endif + +static inline bool ext4_verity_in_progress(struct inode *inode) +{ + return IS_ENABLED(CONFIG_FS_VERITY) && + ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); +} + +#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime + +/* + * Codes for operating systems + */ +#define EXT4_OS_LINUX 0 +#define EXT4_OS_HURD 1 +#define EXT4_OS_MASIX 2 +#define EXT4_OS_FREEBSD 3 +#define EXT4_OS_LITES 4 + +/* + * Revision levels + */ +#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ +#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ + +#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV + +#define EXT4_GOOD_OLD_INODE_SIZE 128 + +#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) +#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX +#define EXT4_TIMESTAMP_MIN S32_MIN + +/* + * Feature set definitions + */ + +#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 +#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 +#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 +#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 +#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 +#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 +#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 +/* + * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes + * incompatible only if fast commit blocks are present in the FS. Since we + * clear the journal (and thus the fast commit blocks), we don't mark FS as + * incompatible. We also have a JBD2 incompat feature, which gets set when + * there are fast commit blocks present in the journal. + */ +#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 +#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 +#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ + +#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 +#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 +#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 +#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 +#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 +#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 +#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 +#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 +#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 +/* + * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When + * METADATA_CSUM is set, group descriptor checksums use the same algorithm as + * all other data structures' checksums. However, the METADATA_CSUM and + * GDT_CSUM bits are mutually exclusive. + */ +#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 +#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 +#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 +#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 +#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be + non-empty */ + +#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 +#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 +#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ +#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ +#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 +#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ +#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 +#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 +#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 +#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ +#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ +#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 +#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ +#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ +#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 +#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 + +extern void ext4_update_dynamic_rev(struct super_block *sb); + +#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ +static inline bool ext4_has_feature_##name(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_compat & \ + cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ +} \ +static inline void ext4_set_feature_##name(struct super_block *sb) \ +{ \ + ext4_update_dynamic_rev(sb); \ + EXT4_SB(sb)->s_es->s_feature_compat |= \ + cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ +} \ +static inline void ext4_clear_feature_##name(struct super_block *sb) \ +{ \ + EXT4_SB(sb)->s_es->s_feature_compat &= \ + ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ +} + +#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ +static inline bool ext4_has_feature_##name(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ + cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ +} \ +static inline void ext4_set_feature_##name(struct super_block *sb) \ +{ \ + ext4_update_dynamic_rev(sb); \ + EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ + cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ +} \ +static inline void ext4_clear_feature_##name(struct super_block *sb) \ +{ \ + EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ + ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ +} + +#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ +static inline bool ext4_has_feature_##name(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ + cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ +} \ +static inline void ext4_set_feature_##name(struct super_block *sb) \ +{ \ + ext4_update_dynamic_rev(sb); \ + EXT4_SB(sb)->s_es->s_feature_incompat |= \ + cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ +} \ +static inline void ext4_clear_feature_##name(struct super_block *sb) \ +{ \ + EXT4_SB(sb)->s_es->s_feature_incompat &= \ + ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ +} + +EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) +EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) +EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) +EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) +EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) +EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) +EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) +EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) +EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) +EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) + +EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) +EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) +EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) +EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) +EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) +EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) +EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) +EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) +EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) +EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) +EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) +EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) +EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) +EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) + +EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) +EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) +EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) +EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) +EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) +EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) +EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) +EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) +EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) +EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) +EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) +EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) +EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) +EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) +EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) +EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) + +#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR +#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ + EXT4_FEATURE_INCOMPAT_META_BG) +#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ + EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT4_FEATURE_RO_COMPAT_BTREE_DIR) + +#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR +#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ + EXT4_FEATURE_INCOMPAT_RECOVER| \ + EXT4_FEATURE_INCOMPAT_META_BG) +#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ + EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT4_FEATURE_RO_COMPAT_BTREE_DIR) + +#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ + EXT4_FEATURE_COMPAT_ORPHAN_FILE) +#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ + EXT4_FEATURE_INCOMPAT_RECOVER| \ + EXT4_FEATURE_INCOMPAT_META_BG| \ + EXT4_FEATURE_INCOMPAT_EXTENTS| \ + EXT4_FEATURE_INCOMPAT_64BIT| \ + EXT4_FEATURE_INCOMPAT_FLEX_BG| \ + EXT4_FEATURE_INCOMPAT_EA_INODE| \ + EXT4_FEATURE_INCOMPAT_MMP | \ + EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ + EXT4_FEATURE_INCOMPAT_ENCRYPT | \ + EXT4_FEATURE_INCOMPAT_CASEFOLD | \ + EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ + EXT4_FEATURE_INCOMPAT_LARGEDIR) +#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ + EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ + EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ + EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ + EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ + EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ + EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ + EXT4_FEATURE_RO_COMPAT_QUOTA |\ + EXT4_FEATURE_RO_COMPAT_PROJECT |\ + EXT4_FEATURE_RO_COMPAT_VERITY |\ + EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) + +#define EXTN_FEATURE_FUNCS(ver) \ +static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_compat & \ + cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ +} \ +static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ + cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ +} \ +static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ +{ \ + return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ + cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ +} + +EXTN_FEATURE_FUNCS(2) +EXTN_FEATURE_FUNCS(3) +EXTN_FEATURE_FUNCS(4) + +static inline bool ext4_has_compat_features(struct super_block *sb) +{ + return (EXT4_SB(sb)->s_es->s_feature_compat != 0); +} +static inline bool ext4_has_ro_compat_features(struct super_block *sb) +{ + return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); +} +static inline bool ext4_has_incompat_features(struct super_block *sb) +{ + return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); +} + +extern int ext4_feature_set_ok(struct super_block *sb, int readonly); + +/* + * Superblock flags + */ +#define EXT4_FLAGS_RESIZING 0 +#define EXT4_FLAGS_SHUTDOWN 1 +#define EXT4_FLAGS_BDEV_IS_DAX 2 + +static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) +{ + return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); +} + +/* + * Default values for user and/or group using reserved blocks + */ +#define EXT4_DEF_RESUID 0 +#define EXT4_DEF_RESGID 0 + +/* + * Default project ID + */ +#define EXT4_DEF_PROJID 0 + +#define EXT4_DEF_INODE_READAHEAD_BLKS 32 + +/* + * Default mount options + */ +#define EXT4_DEFM_DEBUG 0x0001 +#define EXT4_DEFM_BSDGROUPS 0x0002 +#define EXT4_DEFM_XATTR_USER 0x0004 +#define EXT4_DEFM_ACL 0x0008 +#define EXT4_DEFM_UID16 0x0010 +#define EXT4_DEFM_JMODE 0x0060 +#define EXT4_DEFM_JMODE_DATA 0x0020 +#define EXT4_DEFM_JMODE_ORDERED 0x0040 +#define EXT4_DEFM_JMODE_WBACK 0x0060 +#define EXT4_DEFM_NOBARRIER 0x0100 +#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 +#define EXT4_DEFM_DISCARD 0x0400 +#define EXT4_DEFM_NODELALLOC 0x0800 + +/* + * Default journal batch times + */ +#define EXT4_DEF_MIN_BATCH_TIME 0 +#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ + +/* + * Minimum number of groups in a flexgroup before we separate out + * directories into the first block group of a flexgroup + */ +#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 + +/* + * Structure of a directory entry + */ +#define EXT4_NAME_LEN 255 +/* + * Base length of the ext4 directory entry excluding the name length + */ +#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) + +struct ext4_dir_entry { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __le16 name_len; /* Name length */ + char name[EXT4_NAME_LEN]; /* File name */ +}; + + +/* + * Encrypted Casefolded entries require saving the hash on disk. This structure + * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned + * boundary. + */ +struct ext4_dir_entry_hash { + __le32 hash; + __le32 minor_hash; +}; + +/* + * The new version of the directory entry. Since EXT4 structures are + * stored in intel byte order, and the name_len field could never be + * bigger than 255 chars, it's safe to reclaim the extra byte for the + * file_type field. + */ +struct ext4_dir_entry_2 { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __u8 name_len; /* Name length */ + __u8 file_type; /* See file type macros EXT4_FT_* below */ + char name[EXT4_NAME_LEN]; /* File name */ +}; + +/* + * Access the hashes at the end of ext4_dir_entry_2 + */ +#define EXT4_DIRENT_HASHES(entry) \ + ((struct ext4_dir_entry_hash *) \ + (((void *)(entry)) + \ + ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) +#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) +#define EXT4_DIRENT_MINOR_HASH(entry) \ + le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) + +static inline bool ext4_hash_in_dirent(const struct inode *inode) +{ + return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); +} + +/* + * This is a bogus directory entry at the end of each leaf block that + * records checksums. + */ +struct ext4_dir_entry_tail { + __le32 det_reserved_zero1; /* Pretend to be unused */ + __le16 det_rec_len; /* 12 */ + __u8 det_reserved_zero2; /* Zero name length */ + __u8 det_reserved_ft; /* 0xDE, fake file type */ + __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ +}; + +#define EXT4_DIRENT_TAIL(block, blocksize) \ + ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ + ((blocksize) - \ + sizeof(struct ext4_dir_entry_tail)))) + +/* + * Ext4 directory file types. Only the low 3 bits are used. The + * other bits are reserved for now. + */ +#define EXT4_FT_UNKNOWN 0 +#define EXT4_FT_REG_FILE 1 +#define EXT4_FT_DIR 2 +#define EXT4_FT_CHRDEV 3 +#define EXT4_FT_BLKDEV 4 +#define EXT4_FT_FIFO 5 +#define EXT4_FT_SOCK 6 +#define EXT4_FT_SYMLINK 7 + +#define EXT4_FT_MAX 8 + +#define EXT4_FT_DIR_CSUM 0xDE + +/* + * EXT4_DIR_PAD defines the directory entries boundaries + * + * NOTE: It must be a multiple of 4 + */ +#define EXT4_DIR_PAD 4 +#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) +#define EXT4_MAX_REC_LEN ((1<<16)-1) + +/* + * The rec_len is dependent on the type of directory. Directories that are + * casefolded and encrypted need to store the hash as well, so we add room for + * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should + * pass NULL for dir, as those entries do not use the extra fields. + */ +static inline unsigned int ext4_dir_rec_len(__u8 name_len, + const struct inode *dir) +{ + int rec_len = (name_len + 8 + EXT4_DIR_ROUND); + + if (dir && ext4_hash_in_dirent(dir)) + rec_len += sizeof(struct ext4_dir_entry_hash); + return (rec_len & ~EXT4_DIR_ROUND); +} + +/* + * If we ever get support for fs block sizes > page_size, we'll need + * to remove the #if statements in the next two functions... + */ +static inline unsigned int +ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) +{ + unsigned len = le16_to_cpu(dlen); + +#if (PAGE_SIZE >= 65536) + if (len == EXT4_MAX_REC_LEN || len == 0) + return blocksize; + return (len & 65532) | ((len & 3) << 16); +#else + return len; +#endif +} + +static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) +{ + BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); +#if (PAGE_SIZE >= 65536) + if (len < 65536) + return cpu_to_le16(len); + if (len == blocksize) { + if (blocksize == 65536) + return cpu_to_le16(EXT4_MAX_REC_LEN); + else + return cpu_to_le16(0); + } + return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); +#else + return cpu_to_le16(len); +#endif +} + +/* + * Hash Tree Directory indexing + * (c) Daniel Phillips, 2001 + */ + +#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ + ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) +#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ + !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) +#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) + +/* Legal values for the dx_root hash_version field: */ + +#define DX_HASH_LEGACY 0 +#define DX_HASH_HALF_MD4 1 +#define DX_HASH_TEA 2 +#define DX_HASH_LEGACY_UNSIGNED 3 +#define DX_HASH_HALF_MD4_UNSIGNED 4 +#define DX_HASH_TEA_UNSIGNED 5 +#define DX_HASH_SIPHASH 6 + +static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, + const void *address, unsigned int length) +{ + struct { + struct shash_desc shash; + char ctx[4]; + } desc; + + BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); + + desc.shash.tfm = sbi->s_chksum_driver; + *(u32 *)desc.ctx = crc; + + BUG_ON(crypto_shash_update(&desc.shash, address, length)); + + return *(u32 *)desc.ctx; +} + +#ifdef __KERNEL__ + +/* hash info structure used by the directory hash */ +struct dx_hash_info +{ + u32 hash; + u32 minor_hash; + int hash_version; + u32 *seed; +}; + + +/* 32 and 64 bit signed EOF for dx directories */ +#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) +#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) + + +/* + * Control parameters used by ext4_htree_next_block + */ +#define HASH_NB_ALWAYS 1 + +struct ext4_filename { + const struct qstr *usr_fname; + struct fscrypt_str disk_name; + struct dx_hash_info hinfo; +#ifdef CONFIG_FS_ENCRYPTION + struct fscrypt_str crypto_buf; +#endif +#if IS_ENABLED(CONFIG_UNICODE) + struct fscrypt_str cf_name; +#endif +}; + +#define fname_name(p) ((p)->disk_name.name) +#define fname_usr_name(p) ((p)->usr_fname->name) +#define fname_len(p) ((p)->disk_name.len) + +/* + * Describe an inode's exact location on disk and in memory + */ +struct ext4_iloc +{ + struct buffer_head *bh; + unsigned long offset; + ext4_group_t block_group; +}; + +static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) +{ + return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); +} + +static inline bool ext4_is_quota_file(struct inode *inode) +{ + return IS_NOQUOTA(inode) && + !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); +} + +/* + * This structure is stuffed into the struct file's private_data field + * for directories. It is where we put information so that we can do + * readdir operations in hash tree order. + */ +struct dir_private_info { + struct rb_root root; + struct rb_node *curr_node; + struct fname *extra_fname; + loff_t last_pos; + __u32 curr_hash; + __u32 curr_minor_hash; + __u32 next_hash; +}; + +/* calculate the first block number of the group */ +static inline ext4_fsblk_t +ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) +{ + return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); +} + +/* + * Special error return code only used by dx_probe() and its callers. + */ +#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) + +/* htree levels for ext4 */ +#define EXT4_HTREE_LEVEL_COMPAT 2 +#define EXT4_HTREE_LEVEL 3 + +static inline int ext4_dir_htree_level(struct super_block *sb) +{ + return ext4_has_feature_largedir(sb) ? + EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; +} + +/* + * Timeout and state flag for lazy initialization inode thread. + */ +#define EXT4_DEF_LI_WAIT_MULT 10 +#define EXT4_DEF_LI_MAX_START_DELAY 5 +#define EXT4_LAZYINIT_QUIT 0x0001 +#define EXT4_LAZYINIT_RUNNING 0x0002 + +/* + * Lazy inode table initialization info + */ +struct ext4_lazy_init { + unsigned long li_state; + struct list_head li_request_list; + struct mutex li_list_mtx; +}; + +enum ext4_li_mode { + EXT4_LI_MODE_PREFETCH_BBITMAP, + EXT4_LI_MODE_ITABLE, +}; + +struct ext4_li_request { + struct super_block *lr_super; + enum ext4_li_mode lr_mode; + ext4_group_t lr_first_not_zeroed; + ext4_group_t lr_next_group; + struct list_head lr_request; + unsigned long lr_next_sched; + unsigned long lr_timeout; +}; + +struct ext4_features { + struct kobject f_kobj; + struct completion f_kobj_unregister; +}; + +/* + * This structure will be used for multiple mount protection. It will be + * written into the block number saved in the s_mmp_block field in the + * superblock. Programs that check MMP should assume that if + * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe + * to use the filesystem, regardless of how old the timestamp is. + */ +#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ +#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ +#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ +#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ + +struct mmp_struct { + __le32 mmp_magic; /* Magic number for MMP */ + __le32 mmp_seq; /* Sequence no. updated periodically */ + + /* + * mmp_time, mmp_nodename & mmp_bdevname are only used for information + * purposes and do not affect the correctness of the algorithm + */ + __le64 mmp_time; /* Time last updated */ + char mmp_nodename[64]; /* Node which last updated MMP block */ + char mmp_bdevname[32]; /* Bdev which last updated MMP block */ + + /* + * mmp_check_interval is used to verify if the MMP block has been + * updated on the block device. The value is updated based on the + * maximum time to write the MMP block during an update cycle. + */ + __le16 mmp_check_interval; + + __le16 mmp_pad1; + __le32 mmp_pad2[226]; + __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ +}; + +/* arguments passed to the mmp thread */ +struct mmpd_data { + struct buffer_head *bh; /* bh from initial read_mmp_block() */ + struct super_block *sb; /* super block of the fs */ +}; + +/* + * Check interval multiplier + * The MMP block is written every update interval and initially checked every + * update interval x the multiplier (the value is then adapted based on the + * write latency). The reason is that writes can be delayed under load and we + * don't want readers to incorrectly assume that the filesystem is no longer + * in use. + */ +#define EXT4_MMP_CHECK_MULT 2UL + +/* + * Minimum interval for MMP checking in seconds. + */ +#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL + +/* + * Maximum interval for MMP checking in seconds. + */ +#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL + +/* + * Function prototypes + */ + +/* + * Ok, these declarations are also in <linux/kernel.h> but none of the + * ext4 source programs needs to include it so they are duplicated here. + */ +# define NORET_TYPE /**/ +# define ATTRIB_NORET __attribute__((noreturn)) +# define NORET_AND noreturn, + +/* bitmap.c */ +extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); +void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *gdp, + struct buffer_head *bh, int sz); +int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *gdp, + struct buffer_head *bh, int sz); +void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *gdp, + struct buffer_head *bh); +int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, + struct ext4_group_desc *gdp, + struct buffer_head *bh); + +/* balloc.c */ +extern void ext4_get_group_no_and_offset(struct super_block *sb, + ext4_fsblk_t blocknr, + ext4_group_t *blockgrpp, + ext4_grpblk_t *offsetp); +extern ext4_group_t ext4_get_group_number(struct super_block *sb, + ext4_fsblk_t block); + +extern unsigned int ext4_block_group(struct super_block *sb, + ext4_fsblk_t blocknr); +extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, + ext4_fsblk_t blocknr); +extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); +extern unsigned long ext4_bg_num_gdb(struct super_block *sb, + ext4_group_t group); +extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, + ext4_fsblk_t goal, + unsigned int flags, + unsigned long *count, + int *errp); +extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, + s64 nclusters, unsigned int flags); +extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); +extern void ext4_check_blocks_bitmap(struct super_block *); +extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, + ext4_group_t block_group, + struct buffer_head ** bh); +extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, + ext4_group_t group); +extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); + +extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, + ext4_group_t block_group, + bool ignore_locked); +extern int ext4_wait_block_bitmap(struct super_block *sb, + ext4_group_t block_group, + struct buffer_head *bh); +extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, + ext4_group_t block_group); +extern unsigned ext4_free_clusters_after_init(struct super_block *sb, + ext4_group_t block_group, + struct ext4_group_desc *gdp); +ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); + +#if IS_ENABLED(CONFIG_UNICODE) +extern int ext4_fname_setup_ci_filename(struct inode *dir, + const struct qstr *iname, + struct ext4_filename *fname); +#endif + +/* ext4 encryption related stuff goes here crypto.c */ +#ifdef CONFIG_FS_ENCRYPTION +extern const struct fscrypt_operations ext4_cryptops; + +int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, + int lookup, struct ext4_filename *fname); + +int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, + struct ext4_filename *fname); + +void ext4_fname_free_filename(struct ext4_filename *fname); + +int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); + +#else /* !CONFIG_FS_ENCRYPTION */ +static inline int ext4_fname_setup_filename(struct inode *dir, + const struct qstr *iname, + int lookup, + struct ext4_filename *fname) +{ + int err = 0; + fname->usr_fname = iname; + fname->disk_name.name = (unsigned char *) iname->name; + fname->disk_name.len = iname->len; + +#if IS_ENABLED(CONFIG_UNICODE) + err = ext4_fname_setup_ci_filename(dir, iname, fname); +#endif + + return err; +} + +static inline int ext4_fname_prepare_lookup(struct inode *dir, + struct dentry *dentry, + struct ext4_filename *fname) +{ + return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); +} + +static inline void ext4_fname_free_filename(struct ext4_filename *fname) +{ +#if IS_ENABLED(CONFIG_UNICODE) + kfree(fname->cf_name.name); + fname->cf_name.name = NULL; +#endif +} + +static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, + void __user *arg) +{ + return -EOPNOTSUPP; +} +#endif /* !CONFIG_FS_ENCRYPTION */ + +/* dir.c */ +extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, + struct file *, + struct ext4_dir_entry_2 *, + struct buffer_head *, char *, int, + unsigned int); +#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ + unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ + (de), (bh), (buf), (size), (offset))) +extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, + __u32 minor_hash, + struct ext4_dir_entry_2 *dirent, + struct fscrypt_str *ent_name); +extern void ext4_htree_free_dir_info(struct dir_private_info *p); +extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, + struct buffer_head *bh, + void *buf, int buf_size, + struct ext4_filename *fname, + struct ext4_dir_entry_2 **dest_de); +void ext4_insert_dentry(struct inode *dir, struct inode *inode, + struct ext4_dir_entry_2 *de, + int buf_size, + struct ext4_filename *fname); +static inline void ext4_update_dx_flag(struct inode *inode) +{ + if (!ext4_has_feature_dir_index(inode->i_sb) && + ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { + /* ext4_iget() should have caught this... */ + WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); + ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); + } +} +static const unsigned char ext4_filetype_table[] = { + DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK +}; + +static inline unsigned char get_dtype(struct super_block *sb, int filetype) +{ + if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) + return DT_UNKNOWN; + + return ext4_filetype_table[filetype]; +} +extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, + void *buf, int buf_size); + +/* fsync.c */ +extern int ext4_sync_file(struct file *, loff_t, loff_t, int); + +/* hash.c */ +extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, + struct dx_hash_info *hinfo); + +/* ialloc.c */ +extern int ext4_mark_inode_used(struct super_block *sb, int ino); +extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, + struct inode *, umode_t, + const struct qstr *qstr, __u32 goal, + uid_t *owner, __u32 i_flags, + int handle_type, unsigned int line_no, + int nblocks); + +#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ + __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ + (goal), (owner), i_flags, 0, 0, 0) +#define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ + type, nblocks) \ + __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ + 0, (type), __LINE__, (nblocks)) + + +extern void ext4_free_inode(handle_t *, struct inode *); +extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); +extern unsigned long ext4_count_free_inodes(struct super_block *); +extern unsigned long ext4_count_dirs(struct super_block *); +extern void ext4_check_inodes_bitmap(struct super_block *); +extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); +extern int ext4_init_inode_table(struct super_block *sb, + ext4_group_t group, int barrier); +extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); + +/* fast_commit.c */ +int ext4_fc_info_show(struct seq_file *seq, void *v); +void ext4_fc_init(struct super_block *sb, journal_t *journal); +void ext4_fc_init_inode(struct inode *inode); +void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, + ext4_lblk_t end); +void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, + struct dentry *dentry); +void __ext4_fc_track_link(handle_t *handle, struct inode *inode, + struct dentry *dentry); +void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); +void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); +void __ext4_fc_track_create(handle_t *handle, struct inode *inode, + struct dentry *dentry); +void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); +void ext4_fc_track_inode(handle_t *handle, struct inode *inode); +void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); +void ext4_fc_start_update(struct inode *inode); +void ext4_fc_stop_update(struct inode *inode); +void ext4_fc_del(struct inode *inode); +bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); +void ext4_fc_replay_cleanup(struct super_block *sb); +int ext4_fc_commit(journal_t *journal, tid_t commit_tid); +int __init ext4_fc_init_dentry_cache(void); +void ext4_fc_destroy_dentry_cache(void); +int ext4_fc_record_regions(struct super_block *sb, int ino, + ext4_lblk_t lblk, ext4_fsblk_t pblk, + int len, int replay); + +/* mballoc.c */ +extern const struct seq_operations ext4_mb_seq_groups_ops; +extern const struct seq_operations ext4_mb_seq_structs_summary_ops; +extern long ext4_mb_stats; +extern long ext4_mb_max_to_scan; +extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); +extern int ext4_mb_init(struct super_block *); +extern int ext4_mb_release(struct super_block *); +extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, + struct ext4_allocation_request *, int *); +extern int ext4_mb_reserve_blocks(struct super_block *, int); +extern void ext4_discard_preallocations(struct inode *, unsigned int); +extern int __init ext4_init_mballoc(void); +extern void ext4_exit_mballoc(void); +extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, + ext4_group_t group, + unsigned int nr, int *cnt); +extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, + unsigned int nr); + +extern void ext4_free_blocks(handle_t *handle, struct inode *inode, + struct buffer_head *bh, ext4_fsblk_t block, + unsigned long count, int flags); +extern int ext4_mb_alloc_groupinfo(struct super_block *sb, + ext4_group_t ngroups); +extern int ext4_mb_add_groupinfo(struct super_block *sb, + ext4_group_t i, struct ext4_group_desc *desc); +extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, + ext4_fsblk_t block, unsigned long count); +extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); +extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); +extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, + int len, int state); + +/* inode.c */ +void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, + struct ext4_inode_info *ei); +int ext4_inode_is_fast_symlink(struct inode *inode); +struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); +struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); +int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, + bool wait, struct buffer_head **bhs); +int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create); +int ext4_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create); +int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int create); +int ext4_walk_page_buffers(handle_t *handle, + struct inode *inode, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)(handle_t *handle, struct inode *inode, + struct buffer_head *bh)); +int do_journal_get_write_access(handle_t *handle, struct inode *inode, + struct buffer_head *bh); +#define FALL_BACK_TO_NONDELALLOC 1 +#define CONVERT_INLINE_DATA 2 + +typedef enum { + EXT4_IGET_NORMAL = 0, + EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ + EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ + EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ + EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ +} ext4_iget_flags; + +extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, + ext4_iget_flags flags, const char *function, + unsigned int line); + +#define ext4_iget(sb, ino, flags) \ + __ext4_iget((sb), (ino), (flags), __func__, __LINE__) + +extern int ext4_write_inode(struct inode *, struct writeback_control *); +extern int ext4_setattr(struct user_namespace *, struct dentry *, + struct iattr *); +extern u32 ext4_dio_alignment(struct inode *inode); +extern int ext4_getattr(struct user_namespace *, const struct path *, + struct kstat *, u32, unsigned int); +extern void ext4_evict_inode(struct inode *); +extern void ext4_clear_inode(struct inode *); +extern int ext4_file_getattr(struct user_namespace *, const struct path *, + struct kstat *, u32, unsigned int); +extern int ext4_sync_inode(handle_t *, struct inode *); +extern void ext4_dirty_inode(struct inode *, int); +extern int ext4_change_inode_journal_flag(struct inode *, int); +extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); +extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, + struct ext4_iloc *iloc); +extern int ext4_inode_attach_jinode(struct inode *inode); +extern int ext4_can_truncate(struct inode *inode); +extern int ext4_truncate(struct inode *); +extern int ext4_break_layouts(struct inode *); +extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); +extern void ext4_set_inode_flags(struct inode *, bool init); +extern int ext4_alloc_da_blocks(struct inode *inode); +extern void ext4_set_aops(struct inode *inode); +extern int ext4_writepage_trans_blocks(struct inode *); +extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); +extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, + loff_t lstart, loff_t lend); +extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); +extern qsize_t *ext4_get_reserved_space(struct inode *inode); +extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); +extern void ext4_da_release_space(struct inode *inode, int to_free); +extern void ext4_da_update_reserve_space(struct inode *inode, + int used, int quota_claim); +extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, + ext4_fsblk_t pblk, ext4_lblk_t len); + +/* indirect.c */ +extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, + struct ext4_map_blocks *map, int flags); +extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); +extern void ext4_ind_truncate(handle_t *, struct inode *inode); +extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, + ext4_lblk_t start, ext4_lblk_t end); + +/* ioctl.c */ +extern long ext4_ioctl(struct file *, unsigned int, unsigned long); +extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); +int ext4_fileattr_set(struct user_namespace *mnt_userns, + struct dentry *dentry, struct fileattr *fa); +int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); +extern void ext4_reset_inode_seed(struct inode *inode); +int ext4_update_overhead(struct super_block *sb, bool force); + +/* migrate.c */ +extern int ext4_ext_migrate(struct inode *); +extern int ext4_ind_migrate(struct inode *inode); + +/* namei.c */ +extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, + struct inode *inode); +extern int ext4_dirblock_csum_verify(struct inode *inode, + struct buffer_head *bh); +extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, + __u32 start_minor_hash, __u32 *next_hash); +extern int ext4_search_dir(struct buffer_head *bh, + char *search_buf, + int buf_size, + struct inode *dir, + struct ext4_filename *fname, + unsigned int offset, + struct ext4_dir_entry_2 **res_dir); +extern int ext4_generic_delete_entry(struct inode *dir, + struct ext4_dir_entry_2 *de_del, + struct buffer_head *bh, + void *entry_buf, + int buf_size, + int csum_size); +extern bool ext4_empty_dir(struct inode *inode); + +/* resize.c */ +extern void ext4_kvfree_array_rcu(void *to_free); +extern int ext4_group_add(struct super_block *sb, + struct ext4_new_group_data *input); +extern int ext4_group_extend(struct super_block *sb, + struct ext4_super_block *es, + ext4_fsblk_t n_blocks_count); +extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); +extern unsigned int ext4_list_backups(struct super_block *sb, + unsigned int *three, unsigned int *five, + unsigned int *seven); + +/* super.c */ +extern struct buffer_head *ext4_sb_bread(struct super_block *sb, + sector_t block, blk_opf_t op_flags); +extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, + sector_t block); +extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, + bh_end_io_t *end_io); +extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, + bh_end_io_t *end_io); +extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); +extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); +extern int ext4_seq_options_show(struct seq_file *seq, void *offset); +extern int ext4_calculate_overhead(struct super_block *sb); +extern __le32 ext4_superblock_csum(struct super_block *sb, + struct ext4_super_block *es); +extern void ext4_superblock_csum_set(struct super_block *sb); +extern int ext4_alloc_flex_bg_array(struct super_block *sb, + ext4_group_t ngroup); +extern const char *ext4_decode_error(struct super_block *sb, int errno, + char nbuf[16]); +extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, + ext4_group_t block_group, + unsigned int flags); +extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, + ext4_group_t block_group); + +extern __printf(7, 8) +void __ext4_error(struct super_block *, const char *, unsigned int, bool, + int, __u64, const char *, ...); +extern __printf(6, 7) +void __ext4_error_inode(struct inode *, const char *, unsigned int, + ext4_fsblk_t, int, const char *, ...); +extern __printf(5, 6) +void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, + const char *, ...); +extern void __ext4_std_error(struct super_block *, const char *, + unsigned int, int); +extern __printf(4, 5) +void __ext4_warning(struct super_block *, const char *, unsigned int, + const char *, ...); +extern __printf(4, 5) +void __ext4_warning_inode(const struct inode *inode, const char *function, + unsigned int line, const char *fmt, ...); +extern __printf(3, 4) +void __ext4_msg(struct super_block *, const char *, const char *, ...); +extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, + const char *, unsigned int, const char *); +extern __printf(7, 8) +void __ext4_grp_locked_error(const char *, unsigned int, + struct super_block *, ext4_group_t, + unsigned long, ext4_fsblk_t, + const char *, ...); + +#define EXT4_ERROR_INODE(inode, fmt, a...) \ + ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) + +#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ + __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) + +#define ext4_error_inode_block(inode, block, err, fmt, a...) \ + __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ + (fmt), ## a) + +#define EXT4_ERROR_FILE(file, block, fmt, a...) \ + ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) + +#define ext4_abort(sb, err, fmt, a...) \ + __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) + +#ifdef CONFIG_PRINTK + +#define ext4_error_inode(inode, func, line, block, fmt, ...) \ + __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) +#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ + __ext4_error_inode((inode), (func), (line), (block), \ + (err), (fmt), ##__VA_ARGS__) +#define ext4_error_file(file, func, line, block, fmt, ...) \ + __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) +#define ext4_error(sb, fmt, ...) \ + __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ + ##__VA_ARGS__) +#define ext4_error_err(sb, err, fmt, ...) \ + __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ + ##__VA_ARGS__) +#define ext4_warning(sb, fmt, ...) \ + __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) +#define ext4_warning_inode(inode, fmt, ...) \ + __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) +#define ext4_msg(sb, level, fmt, ...) \ + __ext4_msg(sb, level, fmt, ##__VA_ARGS__) +#define dump_mmp_msg(sb, mmp, msg) \ + __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) +#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ + __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ + fmt, ##__VA_ARGS__) + +#else + +#define ext4_error_inode(inode, func, line, block, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_error_inode(inode, "", 0, block, 0, " "); \ +} while (0) +#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_error_inode(inode, "", 0, block, err, " "); \ +} while (0) +#define ext4_error_file(file, func, line, block, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_error_file(file, "", 0, block, " "); \ +} while (0) +#define ext4_error(sb, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_error(sb, "", 0, false, 0, 0, " "); \ +} while (0) +#define ext4_error_err(sb, err, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_error(sb, "", 0, false, err, 0, " "); \ +} while (0) +#define ext4_warning(sb, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_warning(sb, "", 0, " "); \ +} while (0) +#define ext4_warning_inode(inode, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_warning_inode(inode, "", 0, " "); \ +} while (0) +#define ext4_msg(sb, level, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_msg(sb, "", " "); \ +} while (0) +#define dump_mmp_msg(sb, mmp, msg) \ + __dump_mmp_msg(sb, mmp, "", 0, "") +#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ +do { \ + no_printk(fmt, ##__VA_ARGS__); \ + __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ +} while (0) + +#endif + +extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, + struct ext4_group_desc *bg); +extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, + struct ext4_group_desc *bg); +extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, + struct ext4_group_desc *bg); +extern __u32 ext4_free_group_clusters(struct super_block *sb, + struct ext4_group_desc *bg); +extern __u32 ext4_free_inodes_count(struct super_block *sb, + struct ext4_group_desc *bg); +extern __u32 ext4_used_dirs_count(struct super_block *sb, + struct ext4_group_desc *bg); +extern __u32 ext4_itable_unused_count(struct super_block *sb, + struct ext4_group_desc *bg); +extern void ext4_block_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk); +extern void ext4_inode_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk); +extern void ext4_inode_table_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk); +extern void ext4_free_group_clusters_set(struct super_block *sb, + struct ext4_group_desc *bg, + __u32 count); +extern void ext4_free_inodes_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count); +extern void ext4_used_dirs_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count); +extern void ext4_itable_unused_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count); +extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, + struct ext4_group_desc *gdp); +extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, + struct ext4_group_desc *gdp); +extern int ext4_register_li_request(struct super_block *sb, + ext4_group_t first_not_zeroed); + +static inline int ext4_has_metadata_csum(struct super_block *sb) +{ + WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && + !EXT4_SB(sb)->s_chksum_driver); + + return ext4_has_feature_metadata_csum(sb) && + (EXT4_SB(sb)->s_chksum_driver != NULL); +} + +static inline int ext4_has_group_desc_csum(struct super_block *sb) +{ + return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); +} + +#define ext4_read_incompat_64bit_val(es, name) \ + (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ + ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ + le32_to_cpu(es->name##_lo)) + +static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) +{ + return ext4_read_incompat_64bit_val(es, s_blocks_count); +} + +static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) +{ + return ext4_read_incompat_64bit_val(es, s_r_blocks_count); +} + +static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) +{ + return ext4_read_incompat_64bit_val(es, s_free_blocks_count); +} + +static inline void ext4_blocks_count_set(struct ext4_super_block *es, + ext4_fsblk_t blk) +{ + es->s_blocks_count_lo = cpu_to_le32((u32)blk); + es->s_blocks_count_hi = cpu_to_le32(blk >> 32); +} + +static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, + ext4_fsblk_t blk) +{ + es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); + es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); +} + +static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, + ext4_fsblk_t blk) +{ + es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); + es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); +} + +static inline loff_t ext4_isize(struct super_block *sb, + struct ext4_inode *raw_inode) +{ + if (ext4_has_feature_largedir(sb) || + S_ISREG(le16_to_cpu(raw_inode->i_mode))) + return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | + le32_to_cpu(raw_inode->i_size_lo); + + return (loff_t) le32_to_cpu(raw_inode->i_size_lo); +} + +static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) +{ + raw_inode->i_size_lo = cpu_to_le32(i_size); + raw_inode->i_size_high = cpu_to_le32(i_size >> 32); +} + +/* + * Reading s_groups_count requires using smp_rmb() afterwards. See + * the locking protocol documented in the comments of ext4_group_add() + * in resize.c + */ +static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) +{ + ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; + + smp_rmb(); + return ngroups; +} + +static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, + ext4_group_t block_group) +{ + return block_group >> sbi->s_log_groups_per_flex; +} + +static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) +{ + return 1 << sbi->s_log_groups_per_flex; +} + +#define ext4_std_error(sb, errno) \ +do { \ + if ((errno)) \ + __ext4_std_error((sb), __func__, __LINE__, (errno)); \ +} while (0) + +#ifdef CONFIG_SMP +/* Each CPU can accumulate percpu_counter_batch clusters in their local + * counters. So we need to make sure we have free clusters more + * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. + */ +#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) +#else +#define EXT4_FREECLUSTERS_WATERMARK 0 +#endif + +/* Update i_disksize. Requires i_rwsem to avoid races with truncate */ +static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) +{ + WARN_ON_ONCE(S_ISREG(inode->i_mode) && + !inode_is_locked(inode)); + down_write(&EXT4_I(inode)->i_data_sem); + if (newsize > EXT4_I(inode)->i_disksize) + WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); + up_write(&EXT4_I(inode)->i_data_sem); +} + +/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ +static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) +{ + int changed = 0; + + if (newsize > inode->i_size) { + i_size_write(inode, newsize); + changed = 1; + } + if (newsize > EXT4_I(inode)->i_disksize) { + ext4_update_i_disksize(inode, newsize); + changed |= 2; + } + return changed; +} + +int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, + loff_t len); + +struct ext4_group_info { + unsigned long bb_state; +#ifdef AGGRESSIVE_CHECK + unsigned long bb_check_counter; +#endif + struct rb_root bb_free_root; + ext4_grpblk_t bb_first_free; /* first free block */ + ext4_grpblk_t bb_free; /* total free blocks */ + ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ + int bb_avg_fragment_size_order; /* order of average + fragment in BG */ + ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ + ext4_group_t bb_group; /* Group number */ + struct list_head bb_prealloc_list; +#ifdef DOUBLE_CHECK + void *bb_bitmap; +#endif + struct rw_semaphore alloc_sem; + struct list_head bb_avg_fragment_size_node; + struct list_head bb_largest_free_order_node; + ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block + * regions, index is order. + * bb_counters[3] = 5 means + * 5 free 8-block regions. */ +}; + +#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 +#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 +#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 +#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 +#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ + (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) +#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ + (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) +#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 + +#define EXT4_MB_GRP_NEED_INIT(grp) \ + (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) +#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ + (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) +#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ + (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) + +#define EXT4_MB_GRP_WAS_TRIMMED(grp) \ + (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) +#define EXT4_MB_GRP_SET_TRIMMED(grp) \ + (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) +#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ + (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) +#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ + (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) + +#define EXT4_MAX_CONTENTION 8 +#define EXT4_CONTENTION_THRESHOLD 2 + +static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, + ext4_group_t group) +{ + return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); +} + +/* + * Returns true if the filesystem is busy enough that attempts to + * access the block group locks has run into contention. + */ +static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) +{ + return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); +} + +static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) +{ + spinlock_t *lock = ext4_group_lock_ptr(sb, group); + if (spin_trylock(lock)) + /* + * We're able to grab the lock right away, so drop the + * lock contention counter. + */ + atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); + else { + /* + * The lock is busy, so bump the contention counter, + * and then wait on the spin lock. + */ + atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, + EXT4_MAX_CONTENTION); + spin_lock(lock); + } +} + +static inline void ext4_unlock_group(struct super_block *sb, + ext4_group_t group) +{ + spin_unlock(ext4_group_lock_ptr(sb, group)); +} + +#ifdef CONFIG_QUOTA +static inline bool ext4_quota_capable(struct super_block *sb) +{ + return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); +} + +static inline bool ext4_is_quota_journalled(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + return (ext4_has_feature_quota(sb) || + sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); +} +int ext4_enable_quotas(struct super_block *sb); +#endif + +/* + * Block validity checking + */ +#define ext4_check_indirect_blockref(inode, bh) \ + ext4_check_blockref(__func__, __LINE__, inode, \ + (__le32 *)(bh)->b_data, \ + EXT4_ADDR_PER_BLOCK((inode)->i_sb)) + +#define ext4_ind_check_inode(inode) \ + ext4_check_blockref(__func__, __LINE__, inode, \ + EXT4_I(inode)->i_data, \ + EXT4_NDIR_BLOCKS) + +/* + * Inodes and files operations + */ + +/* dir.c */ +extern const struct file_operations ext4_dir_operations; + +/* file.c */ +extern const struct inode_operations ext4_file_inode_operations; +extern const struct file_operations ext4_file_operations; +extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); + +/* inline.c */ +extern int ext4_get_max_inline_size(struct inode *inode); +extern int ext4_find_inline_data_nolock(struct inode *inode); +extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, + unsigned int len); +extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); + +extern int ext4_readpage_inline(struct inode *inode, struct page *page); +extern int ext4_try_to_write_inline_data(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + struct page **pagep); +extern int ext4_write_inline_data_end(struct inode *inode, + loff_t pos, unsigned len, + unsigned copied, + struct page *page); +extern struct buffer_head * +ext4_journalled_write_inline_data(struct inode *inode, + unsigned len, + struct page *page); +extern int ext4_da_write_inline_data_begin(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + struct page **pagep, + void **fsdata); +extern int ext4_try_add_inline_entry(handle_t *handle, + struct ext4_filename *fname, + struct inode *dir, struct inode *inode); +extern int ext4_try_create_inline_dir(handle_t *handle, + struct inode *parent, + struct inode *inode); +extern int ext4_read_inline_dir(struct file *filp, + struct dir_context *ctx, + int *has_inline_data); +extern int ext4_inlinedir_to_tree(struct file *dir_file, + struct inode *dir, ext4_lblk_t block, + struct dx_hash_info *hinfo, + __u32 start_hash, __u32 start_minor_hash, + int *has_inline_data); +extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, + struct ext4_filename *fname, + struct ext4_dir_entry_2 **res_dir, + int *has_inline_data); +extern int ext4_delete_inline_entry(handle_t *handle, + struct inode *dir, + struct ext4_dir_entry_2 *de_del, + struct buffer_head *bh, + int *has_inline_data); +extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); +extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, + struct ext4_dir_entry_2 **parent_de, + int *retval); +extern void *ext4_read_inline_link(struct inode *inode); + +struct iomap; +extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); + +extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); + +extern int ext4_convert_inline_data(struct inode *inode); + +static inline int ext4_has_inline_data(struct inode *inode) +{ + return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && + EXT4_I(inode)->i_inline_off; +} + +/* namei.c */ +extern const struct inode_operations ext4_dir_inode_operations; +extern const struct inode_operations ext4_special_inode_operations; +extern struct dentry *ext4_get_parent(struct dentry *child); +extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, + struct ext4_dir_entry_2 *de, + int blocksize, int csum_size, + unsigned int parent_ino, int dotdot_real_len); +extern void ext4_initialize_dirent_tail(struct buffer_head *bh, + unsigned int blocksize); +extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, + struct buffer_head *bh); +extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, + struct inode *inode, struct dentry *dentry); +extern int __ext4_link(struct inode *dir, struct inode *inode, + struct dentry *dentry); + +#define S_SHIFT 12 +static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { + [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, + [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, + [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, + [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, + [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, + [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, + [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, +}; + +static inline void ext4_set_de_type(struct super_block *sb, + struct ext4_dir_entry_2 *de, + umode_t mode) { + if (ext4_has_feature_filetype(sb)) + de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; +} + +/* readpages.c */ +extern int ext4_mpage_readpages(struct inode *inode, + struct readahead_control *rac, struct page *page); +extern int __init ext4_init_post_read_processing(void); +extern void ext4_exit_post_read_processing(void); + +/* symlink.c */ +extern const struct inode_operations ext4_encrypted_symlink_inode_operations; +extern const struct inode_operations ext4_symlink_inode_operations; +extern const struct inode_operations ext4_fast_symlink_inode_operations; + +/* sysfs.c */ +extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); +extern int ext4_register_sysfs(struct super_block *sb); +extern void ext4_unregister_sysfs(struct super_block *sb); +extern int __init ext4_init_sysfs(void); +extern void ext4_exit_sysfs(void); + +/* block_validity */ +extern void ext4_release_system_zone(struct super_block *sb); +extern int ext4_setup_system_zone(struct super_block *sb); +extern int __init ext4_init_system_zone(void); +extern void ext4_exit_system_zone(void); +extern int ext4_inode_block_valid(struct inode *inode, + ext4_fsblk_t start_blk, + unsigned int count); +extern int ext4_check_blockref(const char *, unsigned int, + struct inode *, __le32 *, unsigned int); +extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, + ext4_fsblk_t start_blk, unsigned int count); + + +/* extents.c */ +struct ext4_ext_path; +struct ext4_extent; + +/* + * Maximum number of logical blocks in a file; ext4_extent's ee_block is + * __le32. + */ +#define EXT_MAX_BLOCKS 0xffffffff + +extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); +extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); +extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, + struct ext4_map_blocks *map, int flags); +extern int ext4_ext_truncate(handle_t *, struct inode *); +extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, + ext4_lblk_t end); +extern void ext4_ext_init(struct super_block *); +extern void ext4_ext_release(struct super_block *); +extern long ext4_fallocate(struct file *file, int mode, loff_t offset, + loff_t len); +extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, + loff_t offset, ssize_t len); +extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, + ext4_io_end_t *io_end); +extern int ext4_map_blocks(handle_t *handle, struct inode *inode, + struct ext4_map_blocks *map, int flags); +extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, + int num, + struct ext4_ext_path *path); +extern int ext4_ext_insert_extent(handle_t *, struct inode *, + struct ext4_ext_path **, + struct ext4_extent *, int); +extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, + struct ext4_ext_path **, + int flags); +extern void ext4_free_ext_path(struct ext4_ext_path *); +extern int ext4_ext_check_inode(struct inode *inode); +extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); +extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + __u64 start, __u64 len); +extern int ext4_get_es_cache(struct inode *inode, + struct fiemap_extent_info *fieinfo, + __u64 start, __u64 len); +extern int ext4_ext_precache(struct inode *inode); +extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, + struct inode *inode2, ext4_lblk_t lblk1, + ext4_lblk_t lblk2, ext4_lblk_t count, + int mark_unwritten,int *err); +extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); +extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, + int check_cred, int restart_cred, + int revoke_cred); +extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); +extern int ext4_ext_replay_set_iblocks(struct inode *inode); +extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, + int len, int unwritten, ext4_fsblk_t pblk); +extern int ext4_ext_clear_bb(struct inode *inode); + + +/* move_extent.c */ +extern void ext4_double_down_write_data_sem(struct inode *first, + struct inode *second); +extern void ext4_double_up_write_data_sem(struct inode *orig_inode, + struct inode *donor_inode); +extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, + __u64 start_orig, __u64 start_donor, + __u64 len, __u64 *moved_len); + +/* page-io.c */ +extern int __init ext4_init_pageio(void); +extern void ext4_exit_pageio(void); +extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); +extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); +extern int ext4_put_io_end(ext4_io_end_t *io_end); +extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); +extern void ext4_io_submit_init(struct ext4_io_submit *io, + struct writeback_control *wbc); +extern void ext4_end_io_rsv_work(struct work_struct *work); +extern void ext4_io_submit(struct ext4_io_submit *io); +extern int ext4_bio_write_page(struct ext4_io_submit *io, + struct page *page, + int len, + bool keep_towrite); +extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); +extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); + +/* mmp.c */ +extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); + +/* mmp.c */ +extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); + +/* verity.c */ +extern const struct fsverity_operations ext4_verityops; + +/* orphan.c */ +extern int ext4_orphan_add(handle_t *, struct inode *); +extern int ext4_orphan_del(handle_t *, struct inode *); +extern void ext4_orphan_cleanup(struct super_block *sb, + struct ext4_super_block *es); +extern void ext4_release_orphan_info(struct super_block *sb); +extern int ext4_init_orphan_info(struct super_block *sb); +extern int ext4_orphan_file_empty(struct super_block *sb); +extern void ext4_orphan_file_block_trigger( + struct jbd2_buffer_trigger_type *triggers, + struct buffer_head *bh, + void *data, size_t size); + +/* + * Add new method to test whether block and inode bitmaps are properly + * initialized. With uninit_bg reading the block from disk is not enough + * to mark the bitmap uptodate. We need to also zero-out the bitmap + */ +#define BH_BITMAP_UPTODATE BH_JBDPrivateStart + +static inline int bitmap_uptodate(struct buffer_head *bh) +{ + return (buffer_uptodate(bh) && + test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); +} +static inline void set_bitmap_uptodate(struct buffer_head *bh) +{ + set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); +} + +#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) + +/* For ioend & aio unwritten conversion wait queues */ +#define EXT4_WQ_HASH_SZ 37 +#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ + EXT4_WQ_HASH_SZ]) +extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; + +extern int ext4_resize_begin(struct super_block *sb); +extern int ext4_resize_end(struct super_block *sb, bool update_backups); + +static inline void ext4_set_io_unwritten_flag(struct inode *inode, + struct ext4_io_end *io_end) +{ + if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { + io_end->flag |= EXT4_IO_END_UNWRITTEN; + atomic_inc(&EXT4_I(inode)->i_unwritten); + } +} + +static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) +{ + struct inode *inode = io_end->inode; + + if (io_end->flag & EXT4_IO_END_UNWRITTEN) { + io_end->flag &= ~EXT4_IO_END_UNWRITTEN; + /* Wake up anyone waiting on unwritten extent conversion */ + if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) + wake_up_all(ext4_ioend_wq(inode)); + } +} + +extern const struct iomap_ops ext4_iomap_ops; +extern const struct iomap_ops ext4_iomap_overwrite_ops; +extern const struct iomap_ops ext4_iomap_report_ops; + +static inline int ext4_buffer_uptodate(struct buffer_head *bh) +{ + /* + * If the buffer has the write error flag, we have failed + * to write out data in the block. In this case, we don't + * have to read the block because we may read the old data + * successfully. + */ + if (buffer_write_io_error(bh)) + set_buffer_uptodate(bh); + return buffer_uptodate(bh); +} + +#endif /* __KERNEL__ */ + +#define EFSBADCRC EBADMSG /* Bad CRC detected */ +#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ + +#endif /* _EXT4_H */ |