diff options
Diffstat (limited to 'fs/nilfs2/the_nilfs.c')
-rw-r--r-- | fs/nilfs2/the_nilfs.c | 170 |
1 files changed, 137 insertions, 33 deletions
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index 8c1097327abc..ba7c10c917fc 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -38,6 +38,8 @@ static LIST_HEAD(nilfs_objects); static DEFINE_SPINLOCK(nilfs_lock); +static int nilfs_valid_sb(struct nilfs_super_block *sbp); + void nilfs_set_last_segment(struct the_nilfs *nilfs, sector_t start_blocknr, u64 seq, __u64 cno) { @@ -45,6 +47,16 @@ void nilfs_set_last_segment(struct the_nilfs *nilfs, nilfs->ns_last_pseg = start_blocknr; nilfs->ns_last_seq = seq; nilfs->ns_last_cno = cno; + + if (!nilfs_sb_dirty(nilfs)) { + if (nilfs->ns_prev_seq == nilfs->ns_last_seq) + goto stay_cursor; + + set_nilfs_sb_dirty(nilfs); + } + nilfs->ns_prev_seq = nilfs->ns_last_seq; + + stay_cursor: spin_unlock(&nilfs->ns_last_segment_lock); } @@ -159,8 +171,7 @@ void put_nilfs(struct the_nilfs *nilfs) kfree(nilfs); } -static int nilfs_load_super_root(struct the_nilfs *nilfs, - struct nilfs_sb_info *sbi, sector_t sr_block) +static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block) { struct buffer_head *bh_sr; struct nilfs_super_root *raw_sr; @@ -169,7 +180,7 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, unsigned inode_size; int err; - err = nilfs_read_super_root_block(sbi->s_super, sr_block, &bh_sr, 1); + err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1); if (unlikely(err)) return err; @@ -248,6 +259,37 @@ static void nilfs_clear_recovery_info(struct nilfs_recovery_info *ri) } /** + * nilfs_store_log_cursor - load log cursor from a super block + * @nilfs: nilfs object + * @sbp: buffer storing super block to be read + * + * nilfs_store_log_cursor() reads the last position of the log + * containing a super root from a given super block, and initializes + * relevant information on the nilfs object preparatory for log + * scanning and recovery. + */ +static int nilfs_store_log_cursor(struct the_nilfs *nilfs, + struct nilfs_super_block *sbp) +{ + int ret = 0; + + nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg); + nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno); + nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq); + + nilfs->ns_prev_seq = nilfs->ns_last_seq; + nilfs->ns_seg_seq = nilfs->ns_last_seq; + nilfs->ns_segnum = + nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg); + nilfs->ns_cno = nilfs->ns_last_cno + 1; + if (nilfs->ns_segnum >= nilfs->ns_nsegments) { + printk(KERN_ERR "NILFS invalid last segment number.\n"); + ret = -EINVAL; + } + return ret; +} + +/** * load_nilfs - load and recover the nilfs * @nilfs: the_nilfs structure to be released * @sbi: nilfs_sb_info used to recover past segment @@ -285,13 +327,55 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) nilfs_init_recovery_info(&ri); - err = nilfs_search_super_root(nilfs, sbi, &ri); + err = nilfs_search_super_root(nilfs, &ri); if (unlikely(err)) { - printk(KERN_ERR "NILFS: error searching super root.\n"); - goto failed; + struct nilfs_super_block **sbp = nilfs->ns_sbp; + int blocksize; + + if (err != -EINVAL) + goto scan_error; + + if (!nilfs_valid_sb(sbp[1])) { + printk(KERN_WARNING + "NILFS warning: unable to fall back to spare" + "super block\n"); + goto scan_error; + } + printk(KERN_INFO + "NILFS: try rollback from an earlier position\n"); + + /* + * restore super block with its spare and reconfigure + * relevant states of the nilfs object. + */ + memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); + nilfs->ns_crc_seed = le32_to_cpu(sbp[0]->s_crc_seed); + nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); + + /* verify consistency between two super blocks */ + blocksize = BLOCK_SIZE << le32_to_cpu(sbp[0]->s_log_block_size); + if (blocksize != nilfs->ns_blocksize) { + printk(KERN_WARNING + "NILFS warning: blocksize differs between " + "two super blocks (%d != %d)\n", + blocksize, nilfs->ns_blocksize); + goto scan_error; + } + + err = nilfs_store_log_cursor(nilfs, sbp[0]); + if (err) + goto scan_error; + + /* drop clean flag to allow roll-forward and recovery */ + nilfs->ns_mount_state &= ~NILFS_VALID_FS; + valid_fs = 0; + + err = nilfs_search_super_root(nilfs, &ri); + if (err) + goto scan_error; } - err = nilfs_load_super_root(nilfs, sbi, ri.ri_super_root); + err = nilfs_load_super_root(nilfs, ri.ri_super_root); if (unlikely(err)) { printk(KERN_ERR "NILFS: error loading super root.\n"); goto failed; @@ -301,11 +385,23 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) goto skip_recovery; if (s_flags & MS_RDONLY) { + __u64 features; + if (nilfs_test_opt(sbi, NORECOVERY)) { printk(KERN_INFO "NILFS: norecovery option specified. " "skipping roll-forward recovery\n"); goto skip_recovery; } + features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & + ~NILFS_FEATURE_COMPAT_RO_SUPP; + if (features) { + printk(KERN_ERR "NILFS: couldn't proceed with " + "recovery because of unsupported optional " + "features (%llx)\n", + (unsigned long long)features); + err = -EROFS; + goto failed_unload; + } if (really_read_only) { printk(KERN_ERR "NILFS: write access " "unavailable, cannot proceed.\n"); @@ -320,14 +416,13 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) goto failed_unload; } - err = nilfs_recover_logical_segments(nilfs, sbi, &ri); + err = nilfs_salvage_orphan_logs(nilfs, sbi, &ri); if (err) goto failed_unload; down_write(&nilfs->ns_sem); - nilfs->ns_mount_state |= NILFS_VALID_FS; - nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); - err = nilfs_commit_super(sbi, 1); + nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */ + err = nilfs_cleanup_super(sbi); up_write(&nilfs->ns_sem); if (err) { @@ -343,10 +438,15 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) sbi->s_super->s_flags = s_flags; return 0; + scan_error: + printk(KERN_ERR "NILFS: error searching super root.\n"); + goto failed; + failed_unload: nilfs_mdt_destroy(nilfs->ns_cpfile); nilfs_mdt_destroy(nilfs->ns_sufile); nilfs_mdt_destroy(nilfs->ns_dat); + nilfs_mdt_destroy(nilfs->ns_gc_dat); failed: nilfs_clear_recovery_info(&ri); @@ -509,14 +609,14 @@ static int nilfs_load_super_block(struct the_nilfs *nilfs, return -EINVAL; } - if (swp) { + if (!valid[!swp]) printk(KERN_WARNING "NILFS warning: broken superblock. " "using spare superblock.\n"); + if (swp) nilfs_swap_super_block(nilfs); - } - nilfs->ns_sbwtime[0] = le64_to_cpu(sbp[0]->s_wtime); - nilfs->ns_sbwtime[1] = valid[!swp] ? le64_to_cpu(sbp[1]->s_wtime) : 0; + nilfs->ns_sbwcount = 0; + nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); *sbpp = sbp[0]; return 0; @@ -557,6 +657,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) if (err) goto out; + err = nilfs_check_feature_compatibility(sb, sbp); + if (err) + goto out; + blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); if (sb->s_blocksize != blocksize && !sb_set_blocksize(sb, blocksize)) { @@ -568,7 +672,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) goto out; } - blocksize = sb_min_blocksize(sb, BLOCK_SIZE); + blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE); if (!blocksize) { printk(KERN_ERR "NILFS: unable to set blocksize\n"); err = -EINVAL; @@ -582,7 +686,18 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) if (err) goto failed_sbh; + err = nilfs_check_feature_compatibility(sb, sbp); + if (err) + goto failed_sbh; + blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); + if (blocksize < NILFS_MIN_BLOCK_SIZE || + blocksize > NILFS_MAX_BLOCK_SIZE) { + printk(KERN_ERR "NILFS: couldn't mount because of unsupported " + "filesystem blocksize %d\n", blocksize); + err = -EINVAL; + goto failed_sbh; + } if (sb->s_blocksize != blocksize) { int hw_blocksize = bdev_logical_block_size(sb->s_bdev); @@ -604,6 +719,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) when reloading fails. */ } nilfs->ns_blocksize_bits = sb->s_blocksize_bits; + nilfs->ns_blocksize = blocksize; err = nilfs_store_disk_layout(nilfs, sbp); if (err) @@ -616,23 +732,9 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info; nilfs->ns_bdi = bdi ? : &default_backing_dev_info; - /* Finding last segment */ - nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg); - nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno); - nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq); - - nilfs->ns_seg_seq = nilfs->ns_last_seq; - nilfs->ns_segnum = - nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg); - nilfs->ns_cno = nilfs->ns_last_cno + 1; - if (nilfs->ns_segnum >= nilfs->ns_nsegments) { - printk(KERN_ERR "NILFS invalid last segment number.\n"); - err = -EINVAL; + err = nilfs_store_log_cursor(nilfs, sbp); + if (err) goto failed_sbh; - } - /* Dummy values */ - nilfs->ns_free_segments_count = - nilfs->ns_nsegments - (nilfs->ns_segnum + 1); /* Initialize gcinode cache */ err = nilfs_init_gccache(nilfs); @@ -674,6 +776,7 @@ int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump, start * sects_per_block, nblocks * sects_per_block, GFP_NOFS, + BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); if (ret < 0) return ret; @@ -684,7 +787,8 @@ int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump, ret = blkdev_issue_discard(nilfs->ns_bdev, start * sects_per_block, nblocks * sects_per_block, - GFP_NOFS, BLKDEV_IFL_BARRIER); + GFP_NOFS, + BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); return ret; } |