| /* |
| * 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 "jfs_user.h" |
| #include "problem.h" |
| #include "uuid/uuid.h" |
| |
| #ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */ |
| static int bh_count = 0; |
| #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 |
| |
| /* 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 journal_bmap(journal_t *journal, blk64_t 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_ctx->fs, inode->i_ino, |
| &inode->i_ext2, NULL, 0, block, 0, &pblk); |
| *phys = pblk; |
| return (retval); |
| #endif |
| } |
| |
| struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize) |
| { |
| struct buffer_head *bh; |
| int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize - |
| sizeof(bh->b_data); |
| |
| bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer"); |
| if (!bh) |
| return NULL; |
| |
| #ifdef CONFIG_JBD_DEBUG |
| if (journal_enable_debug >= 3) |
| bh_count++; |
| #endif |
| jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n", |
| (unsigned long long) blocknr, blocksize, bh_count); |
| |
| bh->b_ctx = kdev->k_ctx; |
| if (kdev->k_dev == K_DEV_FS) |
| bh->b_io = kdev->k_ctx->fs->io; |
| else |
| bh->b_io = kdev->k_ctx->journal_io; |
| bh->b_size = blocksize; |
| bh->b_blocknr = blocknr; |
| |
| return bh; |
| } |
| |
| void sync_blockdev(kdev_t kdev) |
| { |
| io_channel io; |
| |
| if (kdev->k_dev == K_DEV_FS) |
| io = kdev->k_ctx->fs->io; |
| else |
| io = kdev->k_ctx->journal_io; |
| |
| io_channel_flush(io); |
| } |
| |
| void ll_rw_block(int rw, int nr, struct buffer_head *bhp[]) |
| { |
| int retval; |
| struct buffer_head *bh; |
| |
| for (; nr > 0; --nr) { |
| bh = *bhp++; |
| if (rw == 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_ctx->device_name, retval, |
| "while reading block %llu\n", |
| bh->b_blocknr); |
| bh->b_err = retval; |
| continue; |
| } |
| bh->b_uptodate = 1; |
| } else if (rw == 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_ctx->device_name, retval, |
| "while writing block %llu\n", |
| bh->b_blocknr); |
| bh->b_err = retval; |
| continue; |
| } |
| bh->b_dirty = 0; |
| bh->b_uptodate = 1; |
| } else { |
| jfs_debug(3, "no-op %s for block %llu\n", |
| rw == 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(WRITE, 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(READ, 1, &bh); |
| } |
| |
| |
| static void e2fsck_clear_recover(e2fsck_t ctx, int error) |
| { |
| ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER; |
| |
| /* if we had an error doing journal recovery, we need a full fsck */ |
| if (error) |
| ctx->fs->super->s_state &= ~EXT2_VALID_FS; |
| ext2fs_mark_super_dirty(ctx->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 e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) |
| { |
| struct process_block_struct pb; |
| struct ext2_super_block *sb = ctx->fs->super; |
| struct ext2_super_block jsuper; |
| struct problem_context pctx; |
| 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; |
| |
| clear_problem_context(&pctx); |
| |
| journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); |
| if (!journal) { |
| return EXT2_ET_NO_MEMORY; |
| } |
| |
| dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); |
| if (!dev_fs) { |
| retval = EXT2_ET_NO_MEMORY; |
| goto errout; |
| } |
| dev_journal = dev_fs+1; |
| |
| dev_fs->k_ctx = dev_journal->k_ctx = ctx; |
| 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 = ctx->fs->blocksize; |
| |
| if (uuid_is_null(sb->s_journal_uuid)) { |
| if (!sb->s_journal_inum) { |
| retval = EXT2_ET_BAD_INODE_NUM; |
| goto errout; |
| } |
| j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), |
| "journal inode"); |
| if (!j_inode) { |
| retval = EXT2_ET_NO_MEMORY; |
| goto errout; |
| } |
| |
| j_inode->i_ctx = ctx; |
| j_inode->i_ino = sb->s_journal_inum; |
| |
| if ((retval = ext2fs_read_inode(ctx->fs, |
| sb->s_journal_inum, |
| &j_inode->i_ext2))) { |
| 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; |
| e2fsck_use_inode_shortcuts(ctx, 1); |
| ctx->stashed_ino = j_inode->i_ino; |
| ctx->stashed_inode = &j_inode->i_ext2; |
| 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 < |
| JFS_MIN_JOURNAL_BLOCKS) { |
| retval = EXT2_ET_JOURNAL_TOO_SMALL; |
| goto try_backup_journal; |
| } |
| pb.last_block = -1; |
| retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino, |
| BLOCK_FLAG_HOLE, 0, |
| process_journal_block, &pb); |
| if ((pb.last_block + 1) * ctx->fs->blocksize < |
| EXT2_I_SIZE(&j_inode->i_ext2)) { |
| retval = EXT2_ET_JOURNAL_TOO_SMALL; |
| goto try_backup_journal; |
| } |
| if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) { |
| retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum, |
| &j_inode->i_ext2); |
| if (retval) |
| goto errout; |
| } |
| |
| journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / |
| journal->j_blocksize; |
| |
| #ifdef USE_INODE_IO |
| retval = ext2fs_inode_io_intern2(ctx->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; |
| ctx->journal_io = ctx->fs->io; |
| if ((retval = journal_bmap(journal, 0, &start)) != 0) |
| goto errout; |
| #endif |
| } else { |
| ext_journal = 1; |
| if (!ctx->journal_name) { |
| char uuid[37]; |
| |
| uuid_unparse(sb->s_journal_uuid, uuid); |
| ctx->journal_name = blkid_get_devname(ctx->blkid, |
| "UUID", uuid); |
| if (!ctx->journal_name) |
| ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); |
| } |
| journal_name = ctx->journal_name; |
| |
| if (!journal_name) { |
| fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); |
| 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, |
| IO_FLAG_RW | IO_FLAG_EXCLUSIVE, |
| &ctx->journal_io); |
| if (retval) |
| goto errout; |
| |
| io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); |
| |
| if (ext_journal) { |
| if (ctx->fs->blocksize == 1024) |
| start = 1; |
| bh = getblk(dev_journal, start, ctx->fs->blocksize); |
| if (!bh) { |
| retval = EXT2_ET_NO_MEMORY; |
| goto errout; |
| } |
| ll_rw_block(READ, 1, &bh); |
| if ((retval = bh->b_err) != 0) { |
| brelse(bh); |
| goto errout; |
| } |
| memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, |
| sizeof(jsuper)); |
| brelse(bh); |
| #ifdef WORDS_BIGENDIAN |
| if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) |
| ext2fs_swap_super(&jsuper); |
| #endif |
| if (jsuper.s_magic != EXT2_SUPER_MAGIC || |
| !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
| fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); |
| retval = EXT2_ET_LOAD_EXT_JOURNAL; |
| goto errout; |
| } |
| /* Make sure the journal UUID is correct */ |
| if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, |
| sizeof(jsuper.s_uuid))) { |
| fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); |
| retval = EXT2_ET_LOAD_EXT_JOURNAL; |
| goto errout; |
| } |
| |
| journal->j_maxlen = ext2fs_blocks_count(&jsuper); |
| start++; |
| } |
| |
| if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { |
| 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; |
| e2fsck_use_inode_shortcuts(ctx, 0); |
| return 0; |
| |
| errout: |
| e2fsck_use_inode_shortcuts(ctx, 0); |
| 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 e2fsck_journal_fix_bad_inode(e2fsck_t ctx, |
| struct problem_context *pctx) |
| { |
| struct ext2_super_block *sb = ctx->fs->super; |
| int recover = ctx->fs->super->s_feature_incompat & |
| EXT3_FEATURE_INCOMPAT_RECOVER; |
| int has_journal = ctx->fs->super->s_feature_compat & |
| EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
| |
| if (has_journal || sb->s_journal_inum) { |
| /* The journal inode is bogus, remove and force full fsck */ |
| pctx->ino = sb->s_journal_inum; |
| if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) { |
| if (has_journal && sb->s_journal_inum) |
| printf("*** ext3 journal has been deleted - " |
| "filesystem is now ext2 only ***\n\n"); |
| sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
| sb->s_journal_inum = 0; |
| ctx->flags |= E2F_FLAG_JOURNAL_INODE; |
| ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; |
| e2fsck_clear_recover(ctx, 1); |
| return 0; |
| } |
| return EXT2_ET_BAD_INODE_NUM; |
| } else if (recover) { |
| if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) { |
| e2fsck_clear_recover(ctx, 1); |
| return 0; |
| } |
| return EXT2_ET_UNSUPP_FEATURE; |
| } |
| return 0; |
| } |
| |
| #define V1_SB_SIZE 0x0024 |
| static void clear_v2_journal_fields(journal_t *journal) |
| { |
| e2fsck_t ctx = journal->j_dev->k_ctx; |
| struct problem_context pctx; |
| |
| clear_problem_context(&pctx); |
| |
| if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx)) |
| return; |
| |
| memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0, |
| ctx->fs->blocksize-V1_SB_SIZE); |
| mark_buffer_dirty(journal->j_sb_buffer); |
| } |
| |
| |
| static errcode_t e2fsck_journal_load(journal_t *journal) |
| { |
| e2fsck_t ctx = journal->j_dev->k_ctx; |
| journal_superblock_t *jsb; |
| struct buffer_head *jbh = journal->j_sb_buffer; |
| struct problem_context pctx; |
| |
| clear_problem_context(&pctx); |
| |
| ll_rw_block(READ, 1, &jbh); |
| if (jbh->b_err) { |
| com_err(ctx->device_name, jbh->b_err, |
| _("reading journal superblock\n")); |
| return jbh->b_err; |
| } |
| |
| jsb = journal->j_superblock; |
| /* If we don't even have JFS_MAGIC, we probably have a wrong inode */ |
| if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER)) |
| return e2fsck_journal_fix_bad_inode(ctx, &pctx); |
| |
| switch (ntohl(jsb->s_header.h_blocktype)) { |
| case JFS_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 JFS_SUPERBLOCK_V2: |
| journal->j_format_version = 2; |
| if (ntohl(jsb->s_nr_users) > 1 && |
| uuid_is_null(ctx->fs->super->s_journal_uuid)) |
| clear_v2_journal_fields(journal); |
| if (ntohl(jsb->s_nr_users) > 1) { |
| fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx); |
| 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 JFS_DESCRIPTOR_BLOCK: |
| case JFS_COMMIT_BLOCK: |
| case JFS_REVOKE_BLOCK: |
| return EXT2_ET_CORRUPT_SUPERBLOCK; |
| |
| /* 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 (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES)) |
| return EXT2_ET_UNSUPP_FEATURE; |
| |
| if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES)) |
| return EXT2_ET_RO_UNSUPP_FEATURE; |
| |
| /* 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)) { |
| com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, |
| _("%s: no valid journal superblock found\n"), |
| ctx->device_name); |
| return EXT2_ET_CORRUPT_SUPERBLOCK; |
| } |
| |
| if (ntohl(jsb->s_maxlen) < journal->j_maxlen) |
| journal->j_maxlen = ntohl(jsb->s_maxlen); |
| else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) { |
| com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK, |
| _("%s: journal too short\n"), |
| ctx->device_name); |
| return EXT2_ET_CORRUPT_SUPERBLOCK; |
| } |
| |
| 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 e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb, |
| journal_t *journal) |
| { |
| char *p; |
| union { |
| uuid_t uuid; |
| __u32 val[4]; |
| } u; |
| __u32 new_seq = 0; |
| int i; |
| |
| /* Leave a valid existing V1 superblock signature alone. |
| * Anything unrecognisable we overwrite with a new V2 |
| * signature. */ |
| |
| if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) || |
| jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) { |
| jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER); |
| jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2); |
| } |
| |
| /* Zero out everything else beyond the superblock header */ |
| |
| p = ((char *) jsb) + sizeof(journal_header_t); |
| memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t)); |
| |
| jsb->s_blocksize = htonl(ctx->fs->blocksize); |
| jsb->s_maxlen = htonl(journal->j_maxlen); |
| jsb->s_first = htonl(1); |
| |
| /* Initialize the journal sequence number so that there is "no" |
| * chance we will find old "valid" transactions in the journal. |
| * This avoids the need to zero the whole journal (slow to do, |
| * and risky when we are just recovering the filesystem). |
| */ |
| uuid_generate(u.uuid); |
| for (i = 0; i < 4; i ++) |
| new_seq ^= u.val[i]; |
| jsb->s_sequence = htonl(new_seq); |
| |
| mark_buffer_dirty(journal->j_sb_buffer); |
| ll_rw_block(WRITE, 1, &journal->j_sb_buffer); |
| } |
| |
| static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx, |
| journal_t *journal, |
| struct problem_context *pctx) |
| { |
| struct ext2_super_block *sb = ctx->fs->super; |
| int recover = ctx->fs->super->s_feature_incompat & |
| EXT3_FEATURE_INCOMPAT_RECOVER; |
| |
| if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) { |
| if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) { |
| e2fsck_journal_reset_super(ctx, journal->j_superblock, |
| journal); |
| journal->j_transaction_sequence = 1; |
| e2fsck_clear_recover(ctx, recover); |
| return 0; |
| } |
| return EXT2_ET_CORRUPT_SUPERBLOCK; |
| } else if (e2fsck_journal_fix_bad_inode(ctx, pctx)) |
| return EXT2_ET_CORRUPT_SUPERBLOCK; |
| |
| return 0; |
| } |
| |
| static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal, |
| int reset, int drop) |
| { |
| journal_superblock_t *jsb; |
| |
| if (drop) |
| mark_buffer_clean(journal->j_sb_buffer); |
| else if (!(ctx->options & E2F_OPT_READONLY)) { |
| jsb = journal->j_superblock; |
| jsb->s_sequence = htonl(journal->j_transaction_sequence); |
| if (reset) |
| jsb->s_start = 0; /* this marks the journal as empty */ |
| mark_buffer_dirty(journal->j_sb_buffer); |
| } |
| brelse(journal->j_sb_buffer); |
| |
| if (ctx->journal_io) { |
| if (ctx->fs && ctx->fs->io != ctx->journal_io) |
| io_channel_close(ctx->journal_io); |
| ctx->journal_io = 0; |
| } |
| |
| #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. |
| */ |
| int e2fsck_check_ext3_journal(e2fsck_t ctx) |
| { |
| struct ext2_super_block *sb = ctx->fs->super; |
| journal_t *journal; |
| int recover = ctx->fs->super->s_feature_incompat & |
| EXT3_FEATURE_INCOMPAT_RECOVER; |
| struct problem_context pctx; |
| problem_t problem; |
| int reset = 0, force_fsck = 0; |
| int retval; |
| |
| /* If we don't have any journal features, don't do anything more */ |
| if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) && |
| !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 && |
| uuid_is_null(sb->s_journal_uuid)) |
| return 0; |
| |
| clear_problem_context(&pctx); |
| pctx.num = sb->s_journal_inum; |
| |
| retval = e2fsck_get_journal(ctx, &journal); |
| if (retval) { |
| if ((retval == EXT2_ET_BAD_INODE_NUM) || |
| (retval == EXT2_ET_BAD_BLOCK_NUM) || |
| (retval == EXT2_ET_JOURNAL_TOO_SMALL) || |
| (retval == EXT2_ET_NO_JOURNAL)) |
| return e2fsck_journal_fix_bad_inode(ctx, &pctx); |
| return retval; |
| } |
| |
| retval = e2fsck_journal_load(journal); |
| if (retval) { |
| if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) || |
| ((retval == EXT2_ET_UNSUPP_FEATURE) && |
| (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT, |
| &pctx))) || |
| ((retval == EXT2_ET_RO_UNSUPP_FEATURE) && |
| (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT, |
| &pctx))) || |
| ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) && |
| (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx)))) |
| retval = e2fsck_journal_fix_corrupt_super(ctx, journal, |
| &pctx); |
| e2fsck_journal_release(ctx, journal, 0, 1); |
| return retval; |
| } |
| |
| /* |
| * 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. |
| */ |
| no_has_journal: |
| if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { |
| recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER; |
| pctx.str = "inode"; |
| if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) { |
| if (recover && |
| !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx)) |
| goto no_has_journal; |
| /* |
| * Need a full fsck if we are releasing a |
| * journal stored on a reserved inode. |
| */ |
| force_fsck = recover || |
| (sb->s_journal_inum < EXT2_FIRST_INODE(sb)); |
| /* Clear all of the journal fields */ |
| sb->s_journal_inum = 0; |
| sb->s_journal_dev = 0; |
| memset(sb->s_journal_uuid, 0, |
| sizeof(sb->s_journal_uuid)); |
| e2fsck_clear_recover(ctx, force_fsck); |
| } else if (!(ctx->options & E2F_OPT_READONLY)) { |
| sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; |
| ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; |
| ext2fs_mark_super_dirty(ctx->fs); |
| } |
| } |
| |
| if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL && |
| !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && |
| journal->j_superblock->s_start != 0) { |
| /* Print status information */ |
| fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx); |
| if (ctx->superblock) |
| problem = PR_0_JOURNAL_RUN_DEFAULT; |
| else |
| problem = PR_0_JOURNAL_RUN; |
| if (fix_problem(ctx, problem, &pctx)) { |
| ctx->options |= E2F_OPT_FORCE; |
| sb->s_feature_incompat |= |
| EXT3_FEATURE_INCOMPAT_RECOVER; |
| ext2fs_mark_super_dirty(ctx->fs); |
| } else if (fix_problem(ctx, |
| PR_0_JOURNAL_RESET_JOURNAL, &pctx)) { |
| reset = 1; |
| sb->s_state &= ~EXT2_VALID_FS; |
| ext2fs_mark_super_dirty(ctx->fs); |
| } |
| /* |
| * If the user answers no to the above question, we |
| * ignore the fact that journal apparently has data; |
| * accidentally replaying over valid data would be far |
| * worse than skipping a questionable recovery. |
| * |
| * XXX should we abort with a fatal error here? What |
| * will the ext3 kernel code do if a filesystem with |
| * !NEEDS_RECOVERY but with a non-zero |
| * journal->j_superblock->s_start is mounted? |
| */ |
| } |
| |
| /* |
| * 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 (!(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) && |
| journal->j_superblock->s_errno) { |
| ctx->fs->super->s_state |= EXT2_ERROR_FS; |
| ext2fs_mark_super_dirty(ctx->fs); |
| journal->j_superblock->s_errno = 0; |
| mark_buffer_dirty(journal->j_sb_buffer); |
| } |
| |
| e2fsck_journal_release(ctx, journal, reset, 0); |
| return retval; |
| } |
| |
| static errcode_t recover_ext3_journal(e2fsck_t ctx) |
| { |
| struct problem_context pctx; |
| journal_t *journal; |
| int retval; |
| |
| clear_problem_context(&pctx); |
| |
| journal_init_revoke_caches(); |
| retval = e2fsck_get_journal(ctx, &journal); |
| if (retval) |
| return retval; |
| |
| retval = e2fsck_journal_load(journal); |
| if (retval) |
| goto errout; |
| |
| retval = journal_init_revoke(journal, 1024); |
| if (retval) |
| goto errout; |
| |
| retval = -journal_recover(journal); |
| if (retval) |
| goto errout; |
| |
| if (journal->j_failed_commit) { |
| pctx.ino = journal->j_failed_commit; |
| fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx); |
| ctx->fs->super->s_state |= EXT2_ERROR_FS; |
| ext2fs_mark_super_dirty(ctx->fs); |
| } |
| |
| |
| if (journal->j_superblock->s_errno) { |
| ctx->fs->super->s_state |= EXT2_ERROR_FS; |
| ext2fs_mark_super_dirty(ctx->fs); |
| journal->j_superblock->s_errno = 0; |
| mark_buffer_dirty(journal->j_sb_buffer); |
| } |
| |
| errout: |
| journal_destroy_revoke(journal); |
| journal_destroy_revoke_caches(); |
| e2fsck_journal_release(ctx, journal, 1, 0); |
| return retval; |
| } |
| |
| int e2fsck_run_ext3_journal(e2fsck_t ctx) |
| { |
| io_manager io_ptr = ctx->fs->io->manager; |
| int blocksize = ctx->fs->blocksize; |
| errcode_t retval, recover_retval; |
| io_stats stats = 0; |
| unsigned long long kbytes_written = 0; |
| |
| printf(_("%s: recovering journal\n"), ctx->device_name); |
| if (ctx->options & E2F_OPT_READONLY) { |
| printf(_("%s: won't do journal recovery while read-only\n"), |
| ctx->device_name); |
| return EXT2_ET_FILE_RO; |
| } |
| |
| if (ctx->fs->flags & EXT2_FLAG_DIRTY) |
| ext2fs_flush(ctx->fs); /* Force out any modifications */ |
| |
| recover_retval = recover_ext3_journal(ctx); |
| |
| /* |
| * Reload the filesystem context to get up-to-date data from disk |
| * because journal recovery will change the filesystem under us. |
| */ |
| if (ctx->fs->super->s_kbytes_written && |
| ctx->fs->io->manager->get_stats) |
| ctx->fs->io->manager->get_stats(ctx->fs->io, &stats); |
| if (stats && stats->bytes_written) |
| kbytes_written = stats->bytes_written >> 10; |
| |
| ext2fs_mmp_stop(ctx->fs); |
| ext2fs_free(ctx->fs); |
| retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW, |
| ctx->superblock, blocksize, io_ptr, |
| &ctx->fs); |
| if (retval) { |
| com_err(ctx->program_name, retval, |
| _("while trying to re-open %s"), |
| ctx->device_name); |
| fatal_error(ctx, 0); |
| } |
| ctx->fs->priv_data = ctx; |
| ctx->fs->now = ctx->now; |
| ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; |
| ctx->fs->super->s_kbytes_written += kbytes_written; |
| |
| /* Set the superblock flags */ |
| e2fsck_clear_recover(ctx, recover_retval); |
| return recover_retval; |
| } |
| |
| /* |
| * This function will move the journal inode from a visible file in |
| * the filesystem directory hierarchy to the reserved inode if necessary. |
| */ |
| static const char * const journal_names[] = { |
| ".journal", "journal", ".journal.dat", "journal.dat", 0 }; |
| |
| void e2fsck_move_ext3_journal(e2fsck_t ctx) |
| { |
| struct ext2_super_block *sb = ctx->fs->super; |
| struct problem_context pctx; |
| struct ext2_inode inode; |
| ext2_filsys fs = ctx->fs; |
| ext2_ino_t ino; |
| errcode_t retval; |
| const char * const * cpp; |
| int group, mount_flags; |
| |
| clear_problem_context(&pctx); |
| |
| /* |
| * If the filesystem is opened read-only, or there is no |
| * journal, then do nothing. |
| */ |
| if ((ctx->options & E2F_OPT_READONLY) || |
| (sb->s_journal_inum == 0) || |
| !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| return; |
| |
| /* |
| * Read in the journal inode |
| */ |
| if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0) |
| return; |
| |
| /* |
| * If it's necessary to backup the journal inode, do so. |
| */ |
| if ((sb->s_jnl_backup_type == 0) || |
| ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) && |
| memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) { |
| if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) { |
| memcpy(sb->s_jnl_blocks, inode.i_block, |
| EXT2_N_BLOCKS*4); |
| sb->s_jnl_blocks[15] = inode.i_size_high; |
| sb->s_jnl_blocks[16] = inode.i_size; |
| sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS; |
| ext2fs_mark_super_dirty(fs); |
| fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; |
| } |
| } |
| |
| /* |
| * If the journal is already the hidden inode, then do nothing |
| */ |
| if (sb->s_journal_inum == EXT2_JOURNAL_INO) |
| return; |
| |
| /* |
| * The journal inode had better have only one link and not be readable. |
| */ |
| if (inode.i_links_count != 1) |
| return; |
| |
| /* |
| * If the filesystem is mounted, or we can't tell whether |
| * or not it's mounted, do nothing. |
| */ |
| retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags); |
| if (retval || (mount_flags & EXT2_MF_MOUNTED)) |
| return; |
| |
| /* |
| * If we can't find the name of the journal inode, then do |
| * nothing. |
| */ |
| for (cpp = journal_names; *cpp; cpp++) { |
| retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp, |
| strlen(*cpp), 0, &ino); |
| if ((retval == 0) && (ino == sb->s_journal_inum)) |
| break; |
| } |
| if (*cpp == 0) |
| return; |
| |
| /* We need the inode bitmap to be loaded */ |
| retval = ext2fs_read_bitmaps(fs); |
| if (retval) |
| return; |
| |
| pctx.str = *cpp; |
| if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx)) |
| return; |
| |
| /* |
| * OK, we've done all the checks, let's actually move the |
| * journal inode. Errors at this point mean we need to force |
| * an ext2 filesystem check. |
| */ |
| if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0) |
| goto err_out; |
| if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0) |
| goto err_out; |
| sb->s_journal_inum = EXT2_JOURNAL_INO; |
| ext2fs_mark_super_dirty(fs); |
| fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; |
| inode.i_links_count = 0; |
| inode.i_dtime = ctx->now; |
| if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0) |
| goto err_out; |
| |
| group = ext2fs_group_of_ino(fs, ino); |
| ext2fs_unmark_inode_bitmap2(fs->inode_map, ino); |
| ext2fs_mark_ib_dirty(fs); |
| ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1); |
| ext2fs_group_desc_csum_set(fs, group); |
| fs->super->s_free_inodes_count++; |
| return; |
| |
| err_out: |
| pctx.errcode = retval; |
| fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx); |
| fs->super->s_state &= ~EXT2_VALID_FS; |
| ext2fs_mark_super_dirty(fs); |
| return; |
| } |
| |
| /* |
| * This function makes sure the superblock hint for the external |
| * journal is correct. |
| */ |
| int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx) |
| { |
| struct ext2_super_block *sb = ctx->fs->super; |
| struct problem_context pctx; |
| char uuid[37], *journal_name; |
| struct stat st; |
| |
| if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) || |
| uuid_is_null(sb->s_journal_uuid)) |
| return 0; |
| |
| uuid_unparse(sb->s_journal_uuid, uuid); |
| journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); |
| if (!journal_name) |
| return 0; |
| |
| if (stat(journal_name, &st) < 0) |
| return 0; |
| |
| if (st.st_rdev != sb->s_journal_dev) { |
| clear_problem_context(&pctx); |
| pctx.num = st.st_rdev; |
| if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) { |
| sb->s_journal_dev = st.st_rdev; |
| ext2fs_mark_super_dirty(ctx->fs); |
| } |
| } |
| |
| free(journal_name); |
| return 0; |
| } |