/** * journal_t * journal_init_inode () - creates a journal which maps to a inode. * @inode: An inode to create the journal in * * journal_init_inode creates a journal which maps an on-disk inode as * the journal. The inode must exist already, must support bmap() and * must have all data blocks preallocated. */ journal_t * journal_init_inode (struct inode *inode) { struct buffer_head *bh; journal_t *journal = journal_init_common(); int err; int n; unsigned long blocknr; if (!journal) return NULL; journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; journal->j_inode = inode; jbd_debug(1, "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", journal, inode->i_sb->s_id, inode->i_ino, (s64) inode->i_size, inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); journal->j_maxlen = (unsigned int)(inode->i_size >> inode->i_sb->s_blocksize_bits); journal->j_blocksize = inode->i_sb->s_blocksize; /* journal descriptor can store up to n blocks -bzzz */ n = journal->j_blocksize / sizeof(journal_block_tag_t); journal->j_wbufsize = n; journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); if (!journal->j_wbuf) { printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", __FUNCTION__); J_ASSERT(journal->j_revoke != NULL); if (journal->j_revoke) journal_destroy_revoke(journal); kfree(journal); return NULL; } err = journal_bmap(journal, 0, &blocknr); /* If that failed, give up */ if (err) { printk(KERN_ERR "%s: Cannnot locate journal superblock\n", __FUNCTION__); J_ASSERT(journal->j_revoke != NULL); if (journal->j_revoke) journal_destroy_revoke(journal); J_ASSERT(journal->j_wbuf != NULL); kfree(journal->j_wbuf); kfree(journal); return NULL; } bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); J_ASSERT(bh != NULL); journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; return journal; }
static int do_readahead(journal_t *journal, unsigned int start) { int err; unsigned int max, nbufs, next; unsigned long blocknr; struct buffer_head *bh; struct buffer_head * bufs[MAXBUF]; /* Do up to 128K of readahead */ max = start + (128 * 1024 / journal->j_blocksize); if (max > journal->j_maxlen) max = journal->j_maxlen; /* Do the readahead itself. We'll submit MAXBUF buffer_heads at * a time to the block device IO layer. */ nbufs = 0; for (next = start; next < max; next++) { err = journal_bmap(journal, next, &blocknr); if (err) { printk (KERN_ERR "JBD: bad block at offset %u\n", next); goto failed; } bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); if (!bh) { err = -ENOMEM; goto failed; } if (!buffer_uptodate(bh) && !buffer_locked(bh)) { bufs[nbufs++] = bh; if (nbufs == MAXBUF) { ll_rw_block(READ, nbufs, bufs); journal_brelse_array(bufs, nbufs); nbufs = 0; } } else brelse(bh); } if (nbufs) ll_rw_block(READ, nbufs, bufs); err = 0; failed: if (nbufs) journal_brelse_array(bufs, nbufs); return err; }
int journal_next_log_block(journal_t *journal, unsigned long *retp) { unsigned long blocknr; jbd_lock(&journal->j_state_lock); J_ASSERT(journal->j_free > 1); blocknr = journal->j_head; journal->j_head++; journal->j_free--; if (journal->j_head == journal->j_last) journal->j_head = journal->j_first; jbd_unlock(&journal->j_state_lock); return journal_bmap(journal, blocknr, retp); }
static int jread(struct buffer_head **bhp, journal_t *journal, unsigned int offset) { int err; unsigned long blocknr; struct buffer_head *bh; *bhp = NULL; if (offset >= journal->j_maxlen) { printk(KERN_ERR "JBD: corrupted journal superblock\n"); return -EIO; } err = journal_bmap(journal, offset, &blocknr); if (err) { printk (KERN_ERR "JBD: bad block at offset %u\n", offset); return err; } bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); if (!bh) return -ENOMEM; if (!buffer_uptodate(bh)) { /* If this is a brand new buffer, start readahead. Otherwise, we assume we are already reading it. */ if (!buffer_req(bh)) do_readahead(journal, offset); wait_on_buffer(bh); } if (!buffer_uptodate(bh)) { printk (KERN_ERR "JBD: Failed to read block at offset %u\n", offset); brelse(bh); return -EIO; } *bhp = bh; return 0; }
static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) { 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 start = 0; blk_t blk; int ext_journal = 0; int tried_backup_jnl = 0; int i; 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) return EXT2_ET_BAD_INODE_NUM; 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 = 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 (j_inode->i_ext2.i_size / journal->j_blocksize < JFS_MIN_JOURNAL_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } for (i=0; i < EXT2_N_BLOCKS; i++) { blk = j_inode->i_ext2.i_block[i]; if (!blk) { if (i < EXT2_NDIR_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } continue; } if (blk < sb->s_first_data_block || blk >= sb->s_blocks_count) { retval = EXT2_ET_BAD_BLOCK_NUM; goto try_backup_journal; } } journal->j_maxlen = j_inode->i_ext2.i_size / 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); return EXT2_ET_LOAD_EXT_JOURNAL; } 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, &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 EXT2FS_ENABLE_SWAPFS 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 = jsuper.s_blocks_count; 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; 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 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 < (int) 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 = (errcode_t) 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 { int flags = IO_FLAG_RW; if (!(ctx->mount_flags & EXT2_MF_ISROOT && ctx->mount_flags & EXT2_MF_READONLY)) flags |= IO_FLAG_EXCLUSIVE; if ((ctx->mount_flags & EXT2_MF_READONLY) && (ctx->options & E2F_OPT_FORCE)) flags &= ~IO_FLAG_EXCLUSIVE; retval = io_ptr->open(journal_name, flags, &ctx->journal_io); } if (retval) goto errout; io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); if (ext_journal) { blk64_t maxlen; start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 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 + 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 || !(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; brelse(bh); 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; brelse(bh); goto errout; } /* Check the superblock checksum */ if (jsuper.s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) { struct struct_ext2_filsys fsx; struct ext2_super_block superx; void *p; p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET; memcpy(&fsx, ctx->fs, sizeof(fsx)); memcpy(&superx, ctx->fs->super, sizeof(superx)); fsx.super = &superx; fsx.super->s_feature_ro_compat |= EXT4_FEATURE_RO_COMPAT_METADATA_CSUM; if (!ext2fs_superblock_csum_verify(&fsx, p) && fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID, &pctx)) { ext2fs_superblock_csum_set(&fsx, p); mark_buffer_dirty(bh); } } brelse(bh); maxlen = ext2fs_blocks_count(&jsuper); journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1; 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 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 < JFS_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_maxlen = 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)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(READ, 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_maxlen = (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 journal_commit_trans(journal_transaction_t *trans) { struct buffer_head *bh, *cbh = NULL; struct commit_header *commit; #ifdef HAVE_SYS_TIME_H struct timeval tv; #endif errcode_t err; JOURNAL_CHECK_TRANS_MAGIC(trans); if ((trans->flags & J_TRANS_COMMITTED) || !(trans->flags & J_TRANS_OPEN)) return EXT2_ET_INVALID_ARGUMENT; bh = getblk(trans->journal->j_dev, 0, trans->journal->j_blocksize); if (bh == NULL) return ENOMEM; /* write the descriptor block header */ commit = (struct commit_header *)bh->b_data; commit->h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER); commit->h_blocktype = ext2fs_cpu_to_be32(JFS_COMMIT_BLOCK); commit->h_sequence = ext2fs_cpu_to_be32(trans->tid); if (JFS_HAS_COMPAT_FEATURE(trans->journal, JFS_FEATURE_COMPAT_CHECKSUM)) { __u32 csum_v1 = ~0; blk64_t cblk; cbh = getblk(trans->journal->j_dev, 0, trans->journal->j_blocksize); if (cbh == NULL) { err = ENOMEM; goto error; } for (cblk = trans->start; cblk < trans->block; cblk++) { err = journal_bmap(trans->journal, cblk, &cbh->b_blocknr); if (err) goto error; mark_buffer_uptodate(cbh, 0); ll_rw_block(READ, 1, &cbh); err = cbh->b_err; if (err) goto error; csum_v1 = ext2fs_crc32_be(csum_v1, (unsigned char const *)cbh->b_data, cbh->b_size); } commit->h_chksum_type = JFS_CRC32_CHKSUM; commit->h_chksum_size = JFS_CRC32_CHKSUM_SIZE; commit->h_chksum[0] = ext2fs_cpu_to_be32(csum_v1); } else { commit->h_chksum_type = 0; commit->h_chksum_size = 0; commit->h_chksum[0] = 0; } #ifdef HAVE_SYS_TIME_H gettimeofday(&tv, NULL); commit->h_commit_sec = ext2fs_cpu_to_be32(tv.tv_sec); commit->h_commit_nsec = ext2fs_cpu_to_be32(tv.tv_usec * 1000); #else commit->h_commit_sec = 0; commit->h_commit_nsec = 0; #endif /* Write block */ jbd2_commit_block_csum_set(trans->journal, bh); err = journal_bmap(trans->journal, trans->block, &bh->b_blocknr); if (err) goto error; dbg_printf("Writing commit block at %llu:%llu\n", trans->block, bh->b_blocknr); mark_buffer_dirty(bh); ll_rw_block(WRITE, 1, &bh); err = bh->b_err; if (err) goto error; trans->flags |= J_TRANS_COMMITTED; trans->flags &= ~J_TRANS_OPEN; trans->block++; trans->fs->super->s_feature_incompat |= EXT3_FEATURE_INCOMPAT_RECOVER; ext2fs_mark_super_dirty(trans->fs); error: if (cbh) brelse(cbh); brelse(bh); return err; }
errcode_t journal_find_head(journal_t *journal) { unsigned int next_commit_ID; blk64_t next_log_block, head_block; int err; journal_superblock_t *sb; journal_header_t *tmp; struct buffer_head *bh; unsigned int sequence; int blocktype; /* * First thing is to establish what we expect to find in the log * (in terms of transaction IDs), and where (in terms of log * block offsets): query the superblock. */ sb = journal->j_superblock; next_commit_ID = ext2fs_be32_to_cpu(sb->s_sequence); next_log_block = ext2fs_be32_to_cpu(sb->s_start); head_block = next_log_block; if (next_log_block == 0) return 0; bh = getblk(journal->j_dev, 0, journal->j_blocksize); if (bh == NULL) return ENOMEM; /* * Now we walk through the log, transaction by transaction, * making sure that each transaction has a commit block in the * expected place. Each complete transaction gets replayed back * into the main filesystem. */ while (1) { dbg_printf("Scanning for sequence ID %u at %lu/%lu\n", next_commit_ID, (unsigned long)next_log_block, journal->j_last); /* Skip over each chunk of the transaction looking * either the next descriptor block or the final commit * record. */ err = journal_bmap(journal, next_log_block, &bh->b_blocknr); if (err) goto err; mark_buffer_uptodate(bh, 0); ll_rw_block(READ, 1, &bh); err = bh->b_err; if (err) goto err; next_log_block++; wrap(journal, next_log_block); /* What kind of buffer is it? * * If it is a descriptor block, check that it has the * expected sequence number. Otherwise, we're all done * here. */ tmp = (journal_header_t *)bh->b_data; if (tmp->h_magic != ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER)) { dbg_printf("JBD2: wrong magic 0x%x\n", tmp->h_magic); goto err; } blocktype = ext2fs_be32_to_cpu(tmp->h_blocktype); sequence = ext2fs_be32_to_cpu(tmp->h_sequence); dbg_printf("Found magic %d, sequence %d\n", blocktype, sequence); if (sequence != next_commit_ID) { dbg_printf("JBD2: Wrong sequence %d (wanted %d)\n", sequence, next_commit_ID); goto err; } /* OK, we have a valid descriptor block which matches * all of the sequence number checks. What are we going * to do with it? That depends on the pass... */ switch (blocktype) { case JFS_DESCRIPTOR_BLOCK: next_log_block += count_tags(journal, bh->b_data); wrap(journal, next_log_block); continue; case JFS_COMMIT_BLOCK: head_block = next_log_block; next_commit_ID++; continue; case JFS_REVOKE_BLOCK: continue; default: dbg_printf("Unrecognised magic %d, end of scan.\n", blocktype); err = -EINVAL; goto err; } } err: if (err == 0) { dbg_printf("head seq=%d blk=%llu\n", next_commit_ID, head_block); journal->j_transaction_sequence = next_commit_ID; journal->j_head = head_block; } brelse(bh); return err; }
static errcode_t journal_add_blocks_to_trans(journal_transaction_t *trans, blk64_t *block_list, size_t block_len, FILE *fp) { blk64_t curr_blk, jdb_blk; size_t i, j; int csum_size = 0; journal_header_t *jdb; journal_block_tag_t *jdbt; int tag_bytes; void *buf = NULL, *jdb_buf = NULL; struct buffer_head *bh = NULL, *data_bh; errcode_t err; JOURNAL_CHECK_TRANS_MAGIC(trans); if ((trans->flags & J_TRANS_COMMITTED) || !(trans->flags & J_TRANS_OPEN)) return EXT2_ET_INVALID_ARGUMENT; if (block_len == 0) return 0; /* Do we need to leave space at the end for a checksum? */ if (journal_has_csum_v2or3(trans->journal)) csum_size = sizeof(struct journal_block_tail); curr_blk = jdb_blk = trans->block; data_bh = getblk(trans->journal->j_dev, curr_blk, trans->journal->j_blocksize); if (data_bh == NULL) return ENOMEM; buf = data_bh->b_data; /* write the descriptor block header */ bh = getblk(trans->journal->j_dev, curr_blk, trans->journal->j_blocksize); if (bh == NULL) { err = ENOMEM; goto error; } jdb = jdb_buf = bh->b_data; jdb->h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER); jdb->h_blocktype = ext2fs_cpu_to_be32(JFS_DESCRIPTOR_BLOCK); jdb->h_sequence = ext2fs_cpu_to_be32(trans->tid); jdbt = (journal_block_tag_t *)(jdb + 1); curr_blk++; for (i = 0; i < block_len; i++) { j = fread(data_bh->b_data, trans->journal->j_blocksize, 1, fp); if (j != 1) { err = errno; goto error; } tag_bytes = journal_tag_bytes(trans->journal); /* No space left in descriptor block, write it out */ if ((char *)jdbt + tag_bytes > (char *)jdb_buf + trans->journal->j_blocksize - csum_size) { jbd2_descr_block_csum_set(trans->journal, bh); err = journal_bmap(trans->journal, jdb_blk, &bh->b_blocknr); if (err) goto error; dbg_printf("Writing descriptor block at %llu:%llu\n", jdb_blk, bh->b_blocknr); mark_buffer_dirty(bh); ll_rw_block(WRITE, 1, &bh); err = bh->b_err; if (err) goto error; jdbt = (journal_block_tag_t *)(jdb + 1); jdb_blk = curr_blk; curr_blk++; } if (block_list[i] >= ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) { err = EXT2_ET_BAD_BLOCK_NUM; goto error; } /* Fill out the block tag */ jdbt->t_blocknr = ext2fs_cpu_to_be32(block_list[i] & 0xFFFFFFFF); jdbt->t_flags = 0; if (jdbt != (journal_block_tag_t *)(jdb + 1)) jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_SAME_UUID); else { memcpy(jdbt + tag_bytes, trans->journal->j_superblock->s_uuid, sizeof(trans->journal->j_superblock->s_uuid)); tag_bytes += 16; } if (i == block_len - 1) jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_LAST_TAG); if (*((__u32 *)buf) == ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER)) { *((__u32 *)buf) = 0; jdbt->t_flags |= ext2fs_cpu_to_be16(JFS_FLAG_ESCAPE); } if (JFS_HAS_INCOMPAT_FEATURE(trans->journal, JFS_FEATURE_INCOMPAT_64BIT)) jdbt->t_blocknr_high = ext2fs_cpu_to_be32(block_list[i] >> 32); jbd2_block_tag_csum_set(trans->journal, jdbt, data_bh, trans->tid); /* Write the data block */ err = journal_bmap(trans->journal, curr_blk, &data_bh->b_blocknr); if (err) goto error; dbg_printf("Writing data block %llu at %llu:%llu tag %d\n", block_list[i], curr_blk, data_bh->b_blocknr, tag_bytes); mark_buffer_dirty(data_bh); ll_rw_block(WRITE, 1, &data_bh); err = data_bh->b_err; if (err) goto error; curr_blk++; jdbt = (journal_block_tag_t *)(((char *)jdbt) + tag_bytes); } /* Write out the last descriptor block */ if (jdbt != (journal_block_tag_t *)(jdb + 1)) { jbd2_descr_block_csum_set(trans->journal, bh); err = journal_bmap(trans->journal, jdb_blk, &bh->b_blocknr); if (err) goto error; dbg_printf("Writing descriptor block at %llu:%llu\n", jdb_blk, bh->b_blocknr); mark_buffer_dirty(bh); ll_rw_block(WRITE, 1, &bh); err = bh->b_err; if (err) goto error; } error: trans->block = curr_blk; if (bh) brelse(bh); brelse(data_bh); return err; }
static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans, blk64_t *revoke_list, size_t revoke_len) { journal_revoke_header_t *jrb; void *buf; size_t i, offset; blk64_t curr_blk; int sz, csum_size = 0; struct buffer_head *bh; errcode_t err; JOURNAL_CHECK_TRANS_MAGIC(trans); if ((trans->flags & J_TRANS_COMMITTED) || !(trans->flags & J_TRANS_OPEN)) return EXT2_ET_INVALID_ARGUMENT; if (revoke_len == 0) return 0; /* Do we need to leave space at the end for a checksum? */ if (journal_has_csum_v2or3(trans->journal)) csum_size = sizeof(struct journal_revoke_tail); curr_blk = trans->block; bh = getblk(trans->journal->j_dev, curr_blk, trans->journal->j_blocksize); if (bh == NULL) return ENOMEM; jrb = buf = bh->b_data; jrb->r_header.h_magic = ext2fs_cpu_to_be32(JFS_MAGIC_NUMBER); jrb->r_header.h_blocktype = ext2fs_cpu_to_be32(JFS_REVOKE_BLOCK); jrb->r_header.h_sequence = ext2fs_cpu_to_be32(trans->tid); offset = sizeof(*jrb); if (JFS_HAS_INCOMPAT_FEATURE(trans->journal, JFS_FEATURE_INCOMPAT_64BIT)) sz = 8; else sz = 4; for (i = 0; i < revoke_len; i++) { /* Block full, write to journal */ if (offset + sz > trans->journal->j_blocksize - csum_size) { jrb->r_count = ext2fs_cpu_to_be32(offset); jbd2_revoke_csum_set(trans->journal, bh); err = journal_bmap(trans->journal, curr_blk, &bh->b_blocknr); if (err) goto error; dbg_printf("Writing revoke block at %llu:%llu\n", curr_blk, bh->b_blocknr); mark_buffer_dirty(bh); ll_rw_block(WRITE, 1, &bh); err = bh->b_err; if (err) goto error; offset = sizeof(*jrb); curr_blk++; } if (revoke_list[i] >= ext2fs_blocks_count(trans->journal->j_fs_dev->k_fs->super)) { err = EXT2_ET_BAD_BLOCK_NUM; goto error; } if (JFS_HAS_INCOMPAT_FEATURE(trans->journal, JFS_FEATURE_INCOMPAT_64BIT)) *((__u64 *)(&((char *)buf)[offset])) = ext2fs_cpu_to_be64(revoke_list[i]); else *((__u32 *)(&((char *)buf)[offset])) = ext2fs_cpu_to_be32(revoke_list[i]); offset += sz; } if (offset > 0) { jrb->r_count = ext2fs_cpu_to_be32(offset); jbd2_revoke_csum_set(trans->journal, bh); err = journal_bmap(trans->journal, curr_blk, &bh->b_blocknr); if (err) goto error; dbg_printf("Writing revoke block at %llu:%llu\n", curr_blk, bh->b_blocknr); mark_buffer_dirty(bh); ll_rw_block(WRITE, 1, &bh); err = bh->b_err; if (err) goto error; curr_blk++; } error: trans->block = curr_blk; brelse(bh); return err; }