diff options
Diffstat (limited to 'debugfs/journal.c')
| -rw-r--r-- | debugfs/journal.c | 947 |
1 files changed, 947 insertions, 0 deletions
diff --git a/debugfs/journal.c b/debugfs/journal.c new file mode 100644 index 0000000..5bac0d3 --- /dev/null +++ b/debugfs/journal.c @@ -0,0 +1,947 @@ +/* + * journal.c --- code for handling the "ext3" journal + * + * Copyright (C) 2000 Andreas Dilger + * Copyright (C) 2000 Theodore Ts'o + * + * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie + * Copyright (C) 1999 Red Hat Software + * + * This file may be redistributed under the terms of the + * GNU General Public License version 2 or at your discretion + * any later version. + */ + +#include "config.h" +#ifdef HAVE_SYS_MOUNT_H +#include <sys/param.h> +#include <sys/mount.h> +#define MNT_FL (MS_MGC_VAL | MS_RDONLY) +#endif +#ifdef HAVE_SYS_STAT_H +#include <sys/stat.h> +#endif + +#define E2FSCK_INCLUDE_INLINE_FUNCS +#include "uuid/uuid.h" +#include "journal.h" + +static int bh_count = 0; + +#if EXT2_FLAT_INCLUDES +#include "blkid.h" +#else +#include "blkid/blkid.h" +#endif + +/* + * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths. + * This creates a larger static binary, and a smaller binary using + * shared libraries. It's also probably slightly less CPU-efficient, + * which is why it's not on by default. But, it's a good way of + * testing the functions in inode_io.c and fileio.c. + */ +#undef USE_INODE_IO + +/* Checksumming functions */ +static int ext2fs_journal_verify_csum_type(journal_t *j, + journal_superblock_t *jsb) +{ + if (!jbd2_journal_has_csum_v2or3(j)) + return 1; + + return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM; +} + +static __u32 ext2fs_journal_sb_csum(journal_superblock_t *jsb) +{ + __u32 crc, old_crc; + + old_crc = jsb->s_checksum; + jsb->s_checksum = 0; + crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb, + sizeof(journal_superblock_t)); + jsb->s_checksum = old_crc; + + return crc; +} + +static int ext2fs_journal_sb_csum_verify(journal_t *j, + journal_superblock_t *jsb) +{ + __u32 provided, calculated; + + if (!jbd2_journal_has_csum_v2or3(j)) + return 1; + + provided = ext2fs_be32_to_cpu(jsb->s_checksum); + calculated = ext2fs_journal_sb_csum(jsb); + + return provided == calculated; +} + +static errcode_t ext2fs_journal_sb_csum_set(journal_t *j, + journal_superblock_t *jsb) +{ + __u32 crc; + + if (!jbd2_journal_has_csum_v2or3(j)) + return 0; + + crc = ext2fs_journal_sb_csum(jsb); + jsb->s_checksum = ext2fs_cpu_to_be32(crc); + return 0; +} + +/* Kernel compatibility functions for handling the journal. These allow us + * to use the recovery.c file virtually unchanged from the kernel, so we + * don't have to do much to keep kernel and user recovery in sync. + */ +int jbd2_journal_bmap(journal_t *journal, unsigned long block, + unsigned long long *phys) +{ +#ifdef USE_INODE_IO + *phys = block; + return 0; +#else + struct inode *inode = journal->j_inode; + errcode_t retval; + blk64_t pblk; + + if (!inode) { + *phys = block; + return 0; + } + + retval = ext2fs_bmap2(inode->i_fs, inode->i_ino, + &inode->i_ext2, NULL, 0, (blk64_t) block, + 0, &pblk); + *phys = pblk; + return (int) retval; +#endif +} + +struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr, + int blocksize) +{ + struct buffer_head *bh; + int bufsize = sizeof(*bh) + kdev->k_fs->blocksize - + sizeof(bh->b_data); + errcode_t retval; + + retval = ext2fs_get_memzero(bufsize, &bh); + if (retval) + return NULL; + + if (journal_enable_debug >= 3) + bh_count++; + jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n", + blocknr, blocksize, bh_count); + + bh->b_fs = kdev->k_fs; + if (kdev->k_dev == K_DEV_FS) + bh->b_io = kdev->k_fs->io; + else + bh->b_io = kdev->k_fs->journal_io; + bh->b_size = blocksize; + bh->b_blocknr = blocknr; + + return bh; +} + +int sync_blockdev(kdev_t kdev) +{ + io_channel io; + + if (kdev->k_dev == K_DEV_FS) + io = kdev->k_fs->io; + else + io = kdev->k_fs->journal_io; + + return io_channel_flush(io) ? EIO : 0; +} + +void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr, + struct buffer_head *bhp[]) +{ + errcode_t retval; + struct buffer_head *bh; + + for (; nr > 0; --nr) { + bh = *bhp++; + if (rw == REQ_OP_READ && !bh->b_uptodate) { + jfs_debug(3, "reading block %llu/%p\n", + bh->b_blocknr, (void *) bh); + retval = io_channel_read_blk64(bh->b_io, + bh->b_blocknr, + 1, bh->b_data); + if (retval) { + com_err(bh->b_fs->device_name, retval, + "while reading block %llu\n", + bh->b_blocknr); + bh->b_err = (int) retval; + continue; + } + bh->b_uptodate = 1; + } else if (rw == REQ_OP_WRITE && bh->b_dirty) { + jfs_debug(3, "writing block %llu/%p\n", + bh->b_blocknr, + (void *) bh); + retval = io_channel_write_blk64(bh->b_io, + bh->b_blocknr, + 1, bh->b_data); + if (retval) { + com_err(bh->b_fs->device_name, retval, + "while writing block %llu\n", + bh->b_blocknr); + bh->b_err = (int) retval; + continue; + } + bh->b_dirty = 0; + bh->b_uptodate = 1; + } else { + jfs_debug(3, "no-op %s for block %llu\n", + rw == REQ_OP_READ ? "read" : "write", + bh->b_blocknr); + } + } +} + +void mark_buffer_dirty(struct buffer_head *bh) +{ + bh->b_dirty = 1; +} + +static void mark_buffer_clean(struct buffer_head *bh) +{ + bh->b_dirty = 0; +} + +void brelse(struct buffer_head *bh) +{ + if (bh->b_dirty) + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); + jfs_debug(3, "freeing block %llu/%p (total %d)\n", + bh->b_blocknr, (void *) bh, --bh_count); + ext2fs_free_mem(&bh); +} + +int buffer_uptodate(struct buffer_head *bh) +{ + return bh->b_uptodate; +} + +void mark_buffer_uptodate(struct buffer_head *bh, int val) +{ + bh->b_uptodate = val; +} + +void wait_on_buffer(struct buffer_head *bh) +{ + if (!bh->b_uptodate) + ll_rw_block(REQ_OP_READ, 0, 1, &bh); +} + + +static void ext2fs_clear_recover(ext2_filsys fs, int error) +{ + ext2fs_clear_feature_journal_needs_recovery(fs->super); + + /* if we had an error doing journal recovery, we need a full fsck */ + if (error) + fs->super->s_state &= ~EXT2_VALID_FS; + /* + * If we replayed the journal by definition the file system + * was mounted since the last time it was checked + */ + if (fs->super->s_lastcheck >= fs->super->s_mtime) + fs->super->s_lastcheck = fs->super->s_mtime - 1; + ext2fs_mark_super_dirty(fs); +} + +/* + * This is a helper function to check the validity of the journal. + */ +struct process_block_struct { + e2_blkcnt_t last_block; +}; + +static int process_journal_block(ext2_filsys fs, + blk64_t *block_nr, + e2_blkcnt_t blockcnt, + blk64_t ref_block EXT2FS_ATTR((unused)), + int ref_offset EXT2FS_ATTR((unused)), + void *priv_data) +{ + struct process_block_struct *p; + blk64_t blk = *block_nr; + + p = (struct process_block_struct *) priv_data; + + if (!blk || blk < fs->super->s_first_data_block || + blk >= ext2fs_blocks_count(fs->super)) + return BLOCK_ABORT; + + if (blockcnt >= 0) + p->last_block = blockcnt; + return 0; +} + +static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal) +{ + struct process_block_struct pb; + struct ext2_super_block *sb = fs->super; + struct ext2_super_block jsuper; + struct buffer_head *bh; + struct inode *j_inode = NULL; + struct kdev_s *dev_fs = NULL, *dev_journal; + const char *journal_name = 0; + journal_t *journal = NULL; + errcode_t retval = 0; + io_manager io_ptr = 0; + unsigned long long start = 0; + int ext_journal = 0; + int tried_backup_jnl = 0; + + retval = ext2fs_get_memzero(sizeof(journal_t), &journal); + if (retval) + return retval; + + retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs); + if (retval) + goto errout; + dev_journal = dev_fs+1; + + dev_fs->k_fs = dev_journal->k_fs = fs; + dev_fs->k_dev = K_DEV_FS; + dev_journal->k_dev = K_DEV_JOURNAL; + + journal->j_dev = dev_journal; + journal->j_fs_dev = dev_fs; + journal->j_inode = NULL; + journal->j_blocksize = fs->blocksize; + + if (uuid_is_null(sb->s_journal_uuid)) { + if (!sb->s_journal_inum) { + retval = EXT2_ET_BAD_INODE_NUM; + goto errout; + } + retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode); + if (retval) + goto errout; + + j_inode->i_fs = fs; + j_inode->i_ino = sb->s_journal_inum; + + retval = ext2fs_read_inode(fs, sb->s_journal_inum, + &j_inode->i_ext2); + if (retval) { +try_backup_journal: + if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || + tried_backup_jnl) + goto errout; + memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); + memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, + EXT2_N_BLOCKS*4); + j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; + j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; + j_inode->i_ext2.i_links_count = 1; + j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; + tried_backup_jnl++; + } + if (!j_inode->i_ext2.i_links_count || + !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { + retval = EXT2_ET_NO_JOURNAL; + goto try_backup_journal; + } + if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < + JBD2_MIN_JOURNAL_BLOCKS) { + retval = EXT2_ET_JOURNAL_TOO_SMALL; + goto try_backup_journal; + } + pb.last_block = -1; + retval = ext2fs_block_iterate3(fs, j_inode->i_ino, + BLOCK_FLAG_HOLE, 0, + process_journal_block, &pb); + if ((pb.last_block + 1) * fs->blocksize < + (int) EXT2_I_SIZE(&j_inode->i_ext2)) { + retval = EXT2_ET_JOURNAL_TOO_SMALL; + goto try_backup_journal; + } + if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) { + retval = ext2fs_write_inode(fs, sb->s_journal_inum, + &j_inode->i_ext2); + if (retval) + goto errout; + } + + journal->j_total_len = EXT2_I_SIZE(&j_inode->i_ext2) / + journal->j_blocksize; + +#ifdef USE_INODE_IO + retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum, + &j_inode->i_ext2, + &journal_name); + if (retval) + goto errout; + + io_ptr = inode_io_manager; +#else + journal->j_inode = j_inode; + fs->journal_io = fs->io; + retval = (errcode_t) jbd2_journal_bmap(journal, 0, &start); + if (retval) + goto errout; +#endif + } else { + ext_journal = 1; + if (!fs->journal_name) { + char uuid[37]; + blkid_cache blkid; + + blkid_get_cache(&blkid, NULL); + uuid_unparse(sb->s_journal_uuid, uuid); + fs->journal_name = blkid_get_devname(blkid, + "UUID", uuid); + if (!fs->journal_name) + fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev); + blkid_put_cache(blkid); + } + journal_name = fs->journal_name; + + if (!journal_name) { + retval = EXT2_ET_LOAD_EXT_JOURNAL; + goto errout; + } + + jfs_debug(1, "Using journal file %s\n", journal_name); + io_ptr = unix_io_manager; + } + +#if 0 + test_io_backing_manager = io_ptr; + io_ptr = test_io_manager; +#endif +#ifndef USE_INODE_IO + if (ext_journal) +#endif + { + retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW, + &fs->journal_io); + } + if (retval) + goto errout; + + io_channel_set_blksize(fs->journal_io, fs->blocksize); + + if (ext_journal) { + blk64_t maxlen; + + start = ext2fs_journal_sb_start(fs->blocksize) - 1; + bh = getblk(dev_journal, start, fs->blocksize); + if (!bh) { + retval = EXT2_ET_NO_MEMORY; + goto errout; + } + ll_rw_block(REQ_OP_READ, 0, 1, &bh); + retval = bh->b_err; + if (retval) { + brelse(bh); + goto errout; + } + memcpy(&jsuper, start ? bh->b_data : + bh->b_data + SUPERBLOCK_OFFSET, + sizeof(jsuper)); +#ifdef WORDS_BIGENDIAN + if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) + ext2fs_swap_super(&jsuper); +#endif + if (jsuper.s_magic != EXT2_SUPER_MAGIC || + !ext2fs_has_feature_journal_dev(&jsuper)) { + retval = EXT2_ET_LOAD_EXT_JOURNAL; + brelse(bh); + goto errout; + } + /* Make sure the journal UUID is correct */ + if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid, + sizeof(jsuper.s_uuid))) { + retval = EXT2_ET_LOAD_EXT_JOURNAL; + brelse(bh); + goto errout; + } + + /* Check the superblock checksum */ + if (ext2fs_has_feature_metadata_csum(&jsuper)) { + struct struct_ext2_filsys fsx; + struct ext2_super_block superx; + void *p; + + p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET; + memcpy(&fsx, fs, sizeof(fsx)); + memcpy(&superx, fs->super, sizeof(superx)); + fsx.super = &superx; + ext2fs_set_feature_metadata_csum(fsx.super); + if (!ext2fs_superblock_csum_verify(&fsx, p)) { + retval = EXT2_ET_LOAD_EXT_JOURNAL; + brelse(bh); + goto errout; + } + } + brelse(bh); + + maxlen = ext2fs_blocks_count(&jsuper); + journal->j_total_len = (maxlen < 1ULL << 32) ? maxlen : + (1ULL << 32) - 1; + start++; + } + + bh = getblk(dev_journal, start, journal->j_blocksize); + if (!bh) { + retval = EXT2_ET_NO_MEMORY; + goto errout; + } + + journal->j_sb_buffer = bh; + journal->j_superblock = (journal_superblock_t *)bh->b_data; + +#ifdef USE_INODE_IO + if (j_inode) + ext2fs_free_mem(&j_inode); +#endif + + *ret_journal = journal; + return 0; + +errout: + if (dev_fs) + ext2fs_free_mem(&dev_fs); + if (j_inode) + ext2fs_free_mem(&j_inode); + if (journal) + ext2fs_free_mem(&journal); + return retval; +} + +static errcode_t ext2fs_journal_fix_bad_inode(ext2_filsys fs) +{ + struct ext2_super_block *sb = fs->super; + int recover = ext2fs_has_feature_journal_needs_recovery(fs->super); + int has_journal = ext2fs_has_feature_journal(fs->super); + + if (has_journal || sb->s_journal_inum) { + /* The journal inode is bogus, remove and force full fsck */ + return EXT2_ET_BAD_INODE_NUM; + } else if (recover) { + return EXT2_ET_UNSUPP_FEATURE; + } + return 0; +} + +#define V1_SB_SIZE 0x0024 +static void clear_v2_journal_fields(journal_t *journal) +{ + ext2_filsys fs = journal->j_dev->k_fs; + + memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, + fs->blocksize-V1_SB_SIZE); + mark_buffer_dirty(journal->j_sb_buffer); +} + + +static errcode_t ext2fs_journal_load(journal_t *journal) +{ + ext2_filsys fs = journal->j_dev->k_fs; + journal_superblock_t *jsb; + struct buffer_head *jbh = journal->j_sb_buffer; + + ll_rw_block(REQ_OP_READ, 0, 1, &jbh); + if (jbh->b_err) + return jbh->b_err; + + jsb = journal->j_superblock; + /* If we don't even have JBD2_MAGIC, we probably have a wrong inode */ + if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER)) + return ext2fs_journal_fix_bad_inode(fs); + + switch (ntohl(jsb->s_header.h_blocktype)) { + case JBD2_SUPERBLOCK_V1: + journal->j_format_version = 1; + if (jsb->s_feature_compat || + jsb->s_feature_incompat || + jsb->s_feature_ro_compat || + jsb->s_nr_users) + clear_v2_journal_fields(journal); + break; + + case JBD2_SUPERBLOCK_V2: + journal->j_format_version = 2; + if (ntohl(jsb->s_nr_users) > 1 && + uuid_is_null(fs->super->s_journal_uuid)) + clear_v2_journal_fields(journal); + if (ntohl(jsb->s_nr_users) > 1) + return EXT2_ET_JOURNAL_UNSUPP_VERSION; + break; + + /* + * These should never appear in a journal super block, so if + * they do, the journal is badly corrupted. + */ + case JBD2_DESCRIPTOR_BLOCK: + case JBD2_COMMIT_BLOCK: + case JBD2_REVOKE_BLOCK: + return EXT2_ET_CORRUPT_JOURNAL_SB; + + /* If we don't understand the superblock major type, but there + * is a magic number, then it is likely to be a new format we + * just don't understand, so leave it alone. */ + default: + return EXT2_ET_JOURNAL_UNSUPP_VERSION; + } + + if (JBD2_HAS_INCOMPAT_FEATURE(journal, ~JBD2_KNOWN_INCOMPAT_FEATURES)) + return EXT2_ET_UNSUPP_FEATURE; + + if (JBD2_HAS_RO_COMPAT_FEATURE(journal, ~JBD2_KNOWN_ROCOMPAT_FEATURES)) + return EXT2_ET_RO_UNSUPP_FEATURE; + + /* Checksum v1-3 are mutually exclusive features. */ + if (jbd2_has_feature_csum2(journal) && jbd2_has_feature_csum3(journal)) + return EXT2_ET_CORRUPT_JOURNAL_SB; + + if (jbd2_journal_has_csum_v2or3(journal) && + jbd2_has_feature_checksum(journal)) + return EXT2_ET_CORRUPT_JOURNAL_SB; + + if (!ext2fs_journal_verify_csum_type(journal, jsb) || + !ext2fs_journal_sb_csum_verify(journal, jsb)) + return EXT2_ET_CORRUPT_JOURNAL_SB; + + if (jbd2_journal_has_csum_v2or3(journal)) + journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid, + sizeof(jsb->s_uuid)); + + /* We have now checked whether we know enough about the journal + * format to be able to proceed safely, so any other checks that + * fail we should attempt to recover from. */ + if (jsb->s_blocksize != htonl(journal->j_blocksize)) + return EXT2_ET_CORRUPT_JOURNAL_SB; + + if (ntohl(jsb->s_maxlen) < journal->j_total_len) + journal->j_total_len = ntohl(jsb->s_maxlen); + else if (ntohl(jsb->s_maxlen) > journal->j_total_len) + return EXT2_ET_CORRUPT_JOURNAL_SB; + + journal->j_tail_sequence = ntohl(jsb->s_sequence); + journal->j_transaction_sequence = journal->j_tail_sequence; + journal->j_tail = ntohl(jsb->s_start); + journal->j_first = ntohl(jsb->s_first); + journal->j_last = ntohl(jsb->s_maxlen); + + return 0; +} + +static void ext2fs_journal_release(ext2_filsys fs, journal_t *journal, + int reset, int drop) +{ + journal_superblock_t *jsb; + + if (drop) + mark_buffer_clean(journal->j_sb_buffer); + else if (fs->flags & EXT2_FLAG_RW) { + jsb = journal->j_superblock; + jsb->s_sequence = htonl(journal->j_tail_sequence); + if (reset) + jsb->s_start = 0; /* this marks the journal as empty */ + ext2fs_journal_sb_csum_set(journal, jsb); + mark_buffer_dirty(journal->j_sb_buffer); + } + brelse(journal->j_sb_buffer); + + if (fs && fs->journal_io) { + if (fs->io != fs->journal_io) + io_channel_close(fs->journal_io); + fs->journal_io = NULL; + free(fs->journal_name); + fs->journal_name = NULL; + } + +#ifndef USE_INODE_IO + if (journal->j_inode) + ext2fs_free_mem(&journal->j_inode); +#endif + if (journal->j_fs_dev) + ext2fs_free_mem(&journal->j_fs_dev); + ext2fs_free_mem(&journal); +} + +/* + * This function makes sure that the superblock fields regarding the + * journal are consistent. + */ +static errcode_t ext2fs_check_ext3_journal(ext2_filsys fs) +{ + struct ext2_super_block *sb = fs->super; + journal_t *journal; + int recover = ext2fs_has_feature_journal_needs_recovery(fs->super); + errcode_t retval; + + /* If we don't have any journal features, don't do anything more */ + if (!ext2fs_has_feature_journal(sb) && + !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && + uuid_is_null(sb->s_journal_uuid)) + return 0; + + retval = ext2fs_get_journal(fs, &journal); + if (retval) + return retval; + + retval = ext2fs_journal_load(journal); + if (retval) + goto err; + + /* + * We want to make the flags consistent here. We will not leave with + * needs_recovery set but has_journal clear. We can't get in a loop + * with -y, -n, or -p, only if a user isn't making up their mind. + */ + if (!ext2fs_has_feature_journal(sb)) { + retval = EXT2_ET_JOURNAL_FLAGS_WRONG; + goto err; + } + + if (ext2fs_has_feature_journal(sb) && + !ext2fs_has_feature_journal_needs_recovery(sb) && + journal->j_superblock->s_start != 0) { + retval = EXT2_ET_JOURNAL_FLAGS_WRONG; + goto err; + } + + /* + * If we don't need to do replay the journal, check to see if + * the journal's errno is set; if so, we need to mark the file + * system as being corrupt and clear the journal's s_errno. + */ + if (!ext2fs_has_feature_journal_needs_recovery(sb) && + journal->j_superblock->s_errno) { + fs->super->s_state |= EXT2_ERROR_FS; + ext2fs_mark_super_dirty(fs); + journal->j_superblock->s_errno = 0; + ext2fs_journal_sb_csum_set(journal, journal->j_superblock); + mark_buffer_dirty(journal->j_sb_buffer); + } + +err: + ext2fs_journal_release(fs, journal, 0, retval ? 1 : 0); + return retval; +} + +static errcode_t recover_ext3_journal(ext2_filsys fs) +{ + journal_t *journal; + errcode_t retval; + + retval = jbd2_journal_init_revoke_record_cache(); + if (retval) + return retval; + + retval = jbd2_journal_init_revoke_table_cache(); + if (retval) + return retval; + + retval = ext2fs_get_journal(fs, &journal); + if (retval) + return retval; + + retval = ext2fs_journal_load(journal); + if (retval) + goto errout; + + retval = jbd2_journal_init_revoke(journal, 1024); + if (retval) + goto errout; + + retval = -jbd2_journal_recover(journal); + if (retval) + goto errout; + + if (journal->j_failed_commit) { + journal->j_superblock->s_errno = -EINVAL; + mark_buffer_dirty(journal->j_sb_buffer); + } + + journal->j_tail_sequence = journal->j_transaction_sequence; + +errout: + jbd2_journal_destroy_revoke(journal); + jbd2_journal_destroy_revoke_record_cache(); + jbd2_journal_destroy_revoke_table_cache(); + ext2fs_journal_release(fs, journal, 1, 0); + return retval; +} + +errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp) +{ + ext2_filsys fs = *fsp; + io_manager io_ptr = fs->io->manager; + errcode_t retval, recover_retval; + io_stats stats = 0; + unsigned long long kbytes_written = 0; + char *fsname; + int fsflags; + int fsblocksize; + + if (!(fs->flags & EXT2_FLAG_RW)) + return EXT2_ET_FILE_RO; + + if (fs->flags & EXT2_FLAG_DIRTY) + ext2fs_flush(fs); /* Force out any modifications */ + + recover_retval = recover_ext3_journal(fs); + + /* + * Reload the filesystem context to get up-to-date data from disk + * because journal recovery will change the filesystem under us. + */ + if (fs->super->s_kbytes_written && + fs->io->manager->get_stats) + fs->io->manager->get_stats(fs->io, &stats); + if (stats && stats->bytes_written) + kbytes_written = stats->bytes_written >> 10; + + ext2fs_mmp_stop(fs); + fsname = fs->device_name; + fs->device_name = NULL; + fsflags = fs->flags; + fsblocksize = fs->blocksize; + ext2fs_free(fs); + *fsp = NULL; + retval = ext2fs_open(fsname, fsflags, 0, fsblocksize, io_ptr, fsp); + ext2fs_free_mem(&fsname); + if (retval) + return retval; + + fs = *fsp; + fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; + fs->super->s_kbytes_written += kbytes_written; + + /* Set the superblock flags */ + ext2fs_clear_recover(fs, recover_retval != 0); + + /* + * Do one last sanity check, and propagate journal->s_errno to + * the EXT2_ERROR_FS flag in the fs superblock if needed. + */ + retval = ext2fs_check_ext3_journal(fs); + return retval ? retval : recover_retval; +} + +errcode_t ext2fs_open_journal(ext2_filsys fs, journal_t **j) +{ + journal_t *journal; + errcode_t retval; + + retval = jbd2_journal_init_revoke_record_cache(); + if (retval) + return retval; + + retval = jbd2_journal_init_revoke_table_cache(); + if (retval) + return retval; + + retval = ext2fs_get_journal(fs, &journal); + if (retval) + return retval; + + retval = ext2fs_journal_load(journal); + if (retval) + goto errout; + + retval = jbd2_journal_init_revoke(journal, 1024); + if (retval) + goto errout; + + if (journal->j_failed_commit) { + journal->j_superblock->s_errno = -EINVAL; + mark_buffer_dirty(journal->j_sb_buffer); + } + + *j = journal; + return 0; + +errout: + jbd2_journal_destroy_revoke(journal); + jbd2_journal_destroy_revoke_record_cache(); + jbd2_journal_destroy_revoke_table_cache(); + ext2fs_journal_release(fs, journal, 1, 0); + return retval; +} + +errcode_t ext2fs_close_journal(ext2_filsys fs, journal_t **j) +{ + journal_t *journal = *j; + + jbd2_journal_destroy_revoke(journal); + jbd2_journal_destroy_revoke_record_cache(); + jbd2_journal_destroy_revoke_table_cache(); + ext2fs_journal_release(fs, journal, 0, 0); + *j = NULL; + + return 0; +} + +void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh) +{ + struct commit_header *h; + __u32 csum; + + if (!jbd2_journal_has_csum_v2or3(j)) + return; + + h = (struct commit_header *)(bh->b_data); + h->h_chksum_type = 0; + h->h_chksum_size = 0; + h->h_chksum[0] = 0; + csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); + h->h_chksum[0] = ext2fs_cpu_to_be32(csum); +} + +void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh) +{ + jbd2_descr_block_csum_set(j, bh); +} + +void jbd2_descr_block_csum_set(journal_t *j, struct buffer_head *bh) +{ + struct jbd2_journal_block_tail *tail; + __u32 csum; + + if (!jbd2_journal_has_csum_v2or3(j)) + return; + + tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize - + sizeof(struct jbd2_journal_block_tail)); + tail->t_checksum = 0; + csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); + tail->t_checksum = ext2fs_cpu_to_be32(csum); +} + +void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag, + struct buffer_head *bh, __u32 sequence) +{ + journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag; + __u32 csum32; + __be32 seq; + + if (!jbd2_journal_has_csum_v2or3(j)) + return; + + seq = ext2fs_cpu_to_be32(sequence); + csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq)); + csum32 = jbd2_chksum(j, csum32, bh->b_data, bh->b_size); + + if (jbd2_has_feature_csum3(j)) + tag3->t_checksum = ext2fs_cpu_to_be32(csum32); + else + tag->t_checksum = ext2fs_cpu_to_be16(csum32); +} + |