diff options
| -rw-r--r-- | fs/nilfs2/nilfs.h | 7 | ||||
| -rw-r--r-- | fs/nilfs2/recovery.c | 1 | ||||
| -rw-r--r-- | fs/nilfs2/segment.c | 8 | ||||
| -rw-r--r-- | fs/nilfs2/segment.h | 2 | ||||
| -rw-r--r-- | fs/nilfs2/super.c | 229 | ||||
| -rw-r--r-- | fs/nilfs2/the_nilfs.c | 180 | ||||
| -rw-r--r-- | fs/nilfs2/the_nilfs.h | 18 | ||||
| -rw-r--r-- | include/linux/nilfs2_fs.h | 4 |
8 files changed, 274 insertions, 175 deletions
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h index a7f5bc724e3..19af5ab8627 100644 --- a/fs/nilfs2/nilfs.h +++ b/fs/nilfs2/nilfs.h @@ -275,13 +275,10 @@ extern void nilfs_error(struct super_block *, const char *, const char *, ...) extern void nilfs_warning(struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4))); extern struct nilfs_super_block * -nilfs_load_super_block(struct super_block *, struct buffer_head **); -extern struct nilfs_super_block * -nilfs_reload_super_block(struct super_block *, struct buffer_head **, int); +nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); extern int nilfs_store_magic_and_option(struct super_block *, struct nilfs_super_block *, char *); -extern void nilfs_update_last_segment(struct nilfs_sb_info *, int); -extern int nilfs_commit_super(struct nilfs_sb_info *); +extern int nilfs_commit_super(struct nilfs_sb_info *, int); extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64); extern void nilfs_detach_checkpoint(struct nilfs_sb_info *); diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c index 6ab4c8fc5e9..6ade0963fc1 100644 --- a/fs/nilfs2/recovery.c +++ b/fs/nilfs2/recovery.c @@ -870,7 +870,6 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, if (scan_newer) ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED; else { - nilfs->ns_prot_seq = ssi.seg_seq; if (nilfs->ns_mount_state & NILFS_VALID_FS) goto super_root_found; scan_newer = 1; diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c index e43558d50e7..fb70ec3be20 100644 --- a/fs/nilfs2/segment.c +++ b/fs/nilfs2/segment.c @@ -2068,7 +2068,8 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) if (update_sr) { nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, - segbuf->sb_sum.seg_seq, nilfs->ns_cno); + segbuf->sb_sum.seg_seq, nilfs->ns_cno++); + sbi->s_super->s_dirt = 1; clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); @@ -2224,9 +2225,6 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) /* Commit segments */ if (has_sr) { - down_write(&nilfs->ns_sem); - nilfs_update_last_segment(sbi, 1); - up_write(&nilfs->ns_sem); nilfs_segctor_commit_free_segments(sci); nilfs_segctor_clear_metadata_dirty(sci); } @@ -2564,7 +2562,7 @@ static int nilfs_segctor_construct(struct nilfs_sc_info *sci, if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && nilfs_discontinued(nilfs)) { down_write(&nilfs->ns_sem); - req->sb_err = nilfs_commit_super(sbi); + req->sb_err = nilfs_commit_super(sbi, 0); up_write(&nilfs->ns_sem); } } diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h index 4a64eb82f1f..a98fc1ed0bb 100644 --- a/fs/nilfs2/segment.h +++ b/fs/nilfs2/segment.h @@ -206,8 +206,6 @@ enum { logical segment with a super root */ #define NILFS_SC_DEFAULT_SR_FREQ 30 /* Maximum frequency of super root creation */ -#define NILFS_SC_DEFAULT_SB_FREQ 30 /* Minimum interval of periodical - update of superblock (reserved) */ /* * The default threshold amount of data, in block counts. diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index ef31e9a51c8..e2ced824c62 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -103,8 +103,9 @@ void nilfs_error(struct super_block *sb, const char *function, down_write(&nilfs->ns_sem); if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { nilfs->ns_mount_state |= NILFS_ERROR_FS; - nilfs->ns_sbp->s_state |= cpu_to_le16(NILFS_ERROR_FS); - nilfs_commit_super(sbi); + nilfs->ns_sbp[0]->s_state |= + cpu_to_le16(NILFS_ERROR_FS); + nilfs_commit_super(sbi, 1); } up_write(&nilfs->ns_sem); @@ -208,90 +209,106 @@ static void nilfs_clear_inode(struct inode *inode) nilfs_btnode_cache_clear(&ii->i_btnode_cache); } -/** - * nilfs_update_last_segment - change pointer to the latest segment - * @sbi: nilfs_sb_info - * @update_cno: flag whether to update checkpoint number. - * - * nilfs_update_last_segment() changes information in the super block - * after a partial segment is written out successfully. The super - * block is marked dirty. It will be written out at the next VFS sync - * operations such as sync_supers() and generic_shutdown_super(). - */ -void nilfs_update_last_segment(struct nilfs_sb_info *sbi, int update_cno) -{ - struct the_nilfs *nilfs = sbi->s_nilfs; - struct nilfs_super_block *sbp = nilfs->ns_sbp; - - /* nilfs->sem must be locked by the caller. */ - spin_lock(&nilfs->ns_last_segment_lock); - if (update_cno) - nilfs->ns_last_cno = nilfs->ns_cno++; - sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); - sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); - sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); - spin_unlock(&nilfs->ns_last_segment_lock); - - sbi->s_super->s_dirt = 1; /* must be set if delaying the call of - nilfs_commit_super() */ -} - -static int nilfs_sync_super(struct nilfs_sb_info *sbi) +static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) { struct the_nilfs *nilfs = sbi->s_nilfs; int err; int barrier_done = 0; if (nilfs_test_opt(sbi, BARRIER)) { - set_buffer_ordered(nilfs->ns_sbh); + set_buffer_ordered(nilfs->ns_sbh[0]); barrier_done = 1; } retry: - set_buffer_dirty(nilfs->ns_sbh); - err = sync_dirty_buffer(nilfs->ns_sbh); + set_buffer_dirty(nilfs->ns_sbh[0]); + err = sync_dirty_buffer(nilfs->ns_sbh[0]); if (err == -EOPNOTSUPP && barrier_done) { nilfs_warning(sbi->s_super, __func__, "barrier-based sync failed. " "disabling barriers\n"); nilfs_clear_opt(sbi, BARRIER); barrier_done = 0; - clear_buffer_ordered(nilfs->ns_sbh); + clear_buffer_ordered(nilfs->ns_sbh[0]); goto retry; } - if (unlikely(err)) + if (unlikely(err)) { printk(KERN_ERR "NILFS: unable to write superblock (err=%d)\n", err); - else { + if (err == -EIO && nilfs->ns_sbh[1]) { + nilfs_fall_back_super_block(nilfs); + goto retry; + } + } else { + struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; + + /* + * The latest segment becomes trailable from the position + * written in superblock. + */ clear_nilfs_discontinued(nilfs); - spin_lock(&nilfs->ns_last_segment_lock); - nilfs->ns_prot_seq = le64_to_cpu(nilfs->ns_sbp->s_last_seq); - spin_unlock(&nilfs->ns_last_segment_lock); + + /* update GC protection for recent segments */ + if (nilfs->ns_sbh[1]) { + sbp = NULL; + if (dupsb) { + set_buffer_dirty(nilfs->ns_sbh[1]); + if (!sync_dirty_buffer(nilfs->ns_sbh[1])) + sbp = nilfs->ns_sbp[1]; + } + } + if (sbp) { + spin_lock(&nilfs->ns_last_segment_lock); + nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); + spin_unlock(&nilfs->ns_last_segment_lock); + } } return err; } -int nilfs_commit_super(struct nilfs_sb_info *sbi) +int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) { struct the_nilfs *nilfs = sbi->s_nilfs; - struct nilfs_super_block *sbp = nilfs->ns_sbp; + struct nilfs_super_block **sbp = nilfs->ns_sbp; sector_t nfreeblocks; + time_t t; int err; /* nilfs->sem must be locked by the caller. */ + if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { + if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) + nilfs_swap_super_block(nilfs); + else { + printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", + sbi->s_super->s_id); + return -EIO; + } + } err = nilfs_count_free_blocks(nilfs, &nfreeblocks); if (unlikely(err)) { printk(KERN_ERR "NILFS: failed to count free blocks\n"); return err; } - sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); - sbp->s_wtime = cpu_to_le64(get_seconds()); - sbp->s_sum = 0; - sbp->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, - (unsigned char *)sbp, - le16_to_cpu(sbp->s_bytes))); + spin_lock(&nilfs->ns_last_segment_lock); + sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); + sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); + sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); + spin_unlock(&nilfs->ns_last_segment_lock); + + t = get_seconds(); + nilfs->ns_sbwtime[0] = t; + sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); + sbp[0]->s_wtime = cpu_to_le64(t); + sbp[0]->s_sum = 0; + sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, + (unsigned char *)sbp[0], + nilfs->ns_sbsize)); + if (dupsb && sbp[1]) { + memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); + nilfs->ns_sbwtime[1] = t; + } sbi->s_super->s_dirt = 0; - return nilfs_sync_super(sbi); + return nilfs_sync_super(sbi, dupsb); } static void nilfs_put_super(struct super_block *sb) @@ -303,8 +320,8 @@ static void nilfs_put_super(struct super_block *sb) if (!(sb->s_flags & MS_RDONLY)) { down_write(&nilfs->ns_sem); - nilfs->ns_sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); - nilfs_commit_super(sbi); + nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); + nilfs_commit_super(sbi, 1); up_write(&nilfs->ns_sem); } @@ -330,7 +347,7 @@ static void nilfs_put_super(struct super_block *sb) * 2. down_write(&nilfs->ns_sem) * * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer - * of the super block (nilfs->ns_sbp). + * of the super block (nilfs->ns_sbp[]). * * In most cases, VFS functions call lock_super() before calling these * methods. So we must be careful not to bring on deadlocks when using @@ -346,8 +363,19 @@ static void nilfs_write_super(struct super_block *sb) struct the_nilfs *nilfs = sbi->s_nilfs; down_write(&nilfs->ns_sem); - if (!(sb->s_flags & MS_RDONLY)) - nilfs_commit_super(sbi); + if (!(sb->s_flags & MS_RDONLY)) { + struct nilfs_super_block **sbp = nilfs->ns_sbp; + u64 t = get_seconds(); + int dupsb; + + if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] && + t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) { + up_write(&nilfs->ns_sem); + return; + } + dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ; + nilfs_commit_super(sbi, dupsb); + } sb->s_dirt = 0; up_write(&nilfs->ns_sem); } @@ -436,7 +464,7 @@ static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) down_write(&nilfs->ns_sem); if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { nilfs->ns_mount_state |= NILFS_VALID_FS; - err = nilfs_commit_super(sbi); + err = nilfs_commit_super(sbi, 1); if (likely(!err)) printk(KERN_INFO "NILFS: recovery complete.\n"); } @@ -652,7 +680,7 @@ nilfs_set_default_options(struct nilfs_sb_info *sbi, static int nilfs_setup_super(struct nilfs_sb_info *sbi) { struct the_nilfs *nilfs = sbi->s_nilfs; - struct nilfs_super_block *sbp = nilfs->ns_sbp; + struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); int mnt_count = le16_to_cpu(sbp->s_mnt_count); @@ -674,88 +702,29 @@ static int nilfs_setup_super(struct nilfs_sb_info *sbi) sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); sbp->s_mtime = cpu_to_le64(get_seconds()); - return nilfs_commit_super(sbi); + return nilfs_commit_super(sbi, 1); } -struct nilfs_super_block * -nilfs_load_super_block(struct super_block *sb, struct buffer_head **pbh) +struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, + u64 pos, int blocksize, + struct buffer_head **pbh) { - int blocksize; - unsigned long offset, sb_index; - - /* - * Adjusting block size - * Blocksize will be enlarged when it is smaller than hardware - * sector size. - * Disk format of superblock does not change. - */ - blocksize = sb_min_blocksize(sb, BLOCK_SIZE); - if (!blocksize) { - printk(KERN_ERR - "NILFS: unable to set blocksize of superblock\n"); - return NULL; - } - sb_index = NILFS_SB_OFFSET_BYTES / blocksize; - offset = NILFS_SB_OFFSET_BYTES % blocksize; + unsigned long long sb_index = pos; + unsigned long offset; + offset = do_div(sb_index, blocksize); *pbh = sb_bread(sb, sb_index); - if (!*pbh) { - printk(KERN_ERR "NILFS: unable to read superblock\n"); + if (!*pbh) return NULL; - } return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); } -struct nilfs_super_block * -nilfs_reload_super_block(struct super_block *sb, struct buffer_head **pbh, - int blocksize) -{ - struct nilfs_super_block *sbp; - unsigned long offset, sb_index; - int hw_blocksize = bdev_hardsect_size(sb->s_bdev); - - if (blocksize < hw_blocksize) { - printk(KERN_ERR - "NILFS: blocksize %d too small for device " - "(sector-size = %d).\n", - blocksize, hw_blocksize); - goto failed_sbh; - } - brelse(*pbh); - sb_set_blocksize(sb, blocksize); - - sb_index = NILFS_SB_OFFSET_BYTES / blocksize; - offset = NILFS_SB_OFFSET_BYTES % blocksize; - - *pbh = sb_bread(sb, sb_index); - if (!*pbh) { - printk(KERN_ERR - "NILFS: cannot read superblock on 2nd try.\n"); - goto failed; - } - - sbp = (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); - if (sbp->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { - printk(KERN_ERR - "NILFS: !? Magic mismatch on 2nd try.\n"); - goto failed_sbh; - } - return sbp; - - failed_sbh: - brelse(*pbh); - - failed: - return NULL; -} - int nilfs_store_magic_and_option(struct super_block *sb, struct nilfs_super_block *sbp, char *data) { struct nilfs_sb_info *sbi = NILFS_SB(sb); - /* trying to fill super (1st stage) */ sb->s_magic = le16_to_cpu(sbp->s_magic); /* FS independent flags */ @@ -763,11 +732,6 @@ int nilfs_store_magic_and_option(struct super_block *sb, sb->s_flags |= MS_NOATIME; #endif - if (sb->s_magic != NILFS_SUPER_MAGIC) { - printk("NILFS: Can't find nilfs on dev %s.\n", sb->s_id); - return -EINVAL; - } - nilfs_set_default_options(sbi, sbp); sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); @@ -775,10 +739,7 @@ int nilfs_store_magic_and_option(struct super_block *sb, sbi->s_interval = le32_to_cpu(sbp->s_c_interval); sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); - if (!parse_options(data, sb)) - return -EINVAL; - - return 0; + return !parse_options(data, sb) ? -EINVAL : 0 ; } /** @@ -967,12 +928,12 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) * the RDONLY flag and then mark the partition as valid again. */ down_write(&nilfs->ns_sem); - sbp = nilfs->ns_sbp; + sbp = nilfs->ns_sbp[0]; if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && (nilfs->ns_mount_state & NILFS_VALID_FS)) sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); sbp->s_mtime = cpu_to_le64(get_seconds()); - nilfs_commit_super(sbi); + nilfs_commit_super(sbi, 1); up_write(&nilfs->ns_sem); } else { /* diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index 661ab762d76..33400cf0bbe 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -25,6 +25,7 @@ #include <linux/slab.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> +#include <linux/crc32.h> #include "nilfs.h" #include "segment.h" #include "alloc.h" @@ -105,7 +106,8 @@ void put_nilfs(struct the_nilfs *nilfs) } if (nilfs_init(nilfs)) { nilfs_destroy_gccache(nilfs); - brelse(nilfs->ns_sbh); + brelse(nilfs->ns_sbh[0]); + brelse(nilfs->ns_sbh[1]); } kfree(nilfs); } @@ -115,6 +117,7 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, { struct buffer_head *bh_sr; struct nilfs_super_root *raw_sr; + struct nilfs_super_block **sbp = nilfs->ns_sbp; unsigned dat_entry_size, segment_usage_size, checkpoint_size; unsigned inode_size; int err; @@ -124,9 +127,9 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, return err; down_read(&nilfs->ns_sem); - dat_entry_size = le16_to_cpu(nilfs->ns_sbp->s_dat_entry_size); - checkpoint_size = le16_to_cpu(nilfs->ns_sbp->s_checkpoint_size); - segment_usage_size = le16_to_cpu(nilfs->ns_sbp->s_segment_usage_size); + dat_entry_size = le16_to_cpu(sbp[0]->s_dat_entry_size); + checkpoint_size = le16_to_cpu(sbp[0]->s_checkpoint_size); + segment_usage_size = le16_to_cpu(sbp[0]->s_segment_usage_size); up_read(&nilfs->ns_sem); inode_size = nilfs->ns_inode_size; @@ -270,11 +273,8 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) nilfs_mdt_destroy(nilfs->ns_dat); goto failed; } - if (ri.ri_need_recovery == NILFS_RECOVERY_SR_UPDATED) { - down_write(&nilfs->ns_sem); - nilfs_update_last_segment(sbi, 0); - up_write(&nilfs->ns_sem); - } + if (ri.ri_need_recovery == NILFS_RECOVERY_SR_UPDATED) + sbi->s_super->s_dirt = 1; } set_nilfs_loaded(nilfs); @@ -296,9 +296,8 @@ static unsigned long long nilfs_max_size(unsigned int blkbits) return res; } -static int -nilfs_store_disk_layout(struct the_nilfs *nilfs, struct super_block *sb, - struct nilfs_super_block *sbp) +static int nilfs_store_disk_layout(struct the_nilfs *nilfs, + struct nilfs_super_block *sbp) { if (le32_to_cpu(sbp->s_rev_level) != NILFS_CURRENT_REV) { printk(KERN_ERR "NILFS: revision mismatch " @@ -309,6 +308,10 @@ nilfs_store_disk_layout(struct the_nilfs *nilfs, struct super_block *sb, NILFS_CURRENT_REV, NILFS_MINOR_REV); return -EINVAL; } + nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes); + if (nilfs->ns_sbsize > BLOCK_SIZE) + return -EINVAL; + nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size); nilfs->ns_first_ino = le32_to_cpu(sbp->s_first_ino); @@ -330,6 +333,122 @@ nilfs_store_disk_layout(struct the_nilfs *nilfs, struct super_block *sb, return 0; } +static int nilfs_valid_sb(struct nilfs_super_block *sbp) +{ + static unsigned char sum[4]; + const int sumoff = offsetof(struct nilfs_super_block, s_sum); + size_t bytes; + u32 crc; + + if (!sbp || le16_to_cpu(sbp->s_magic) != NILFS_SUPER_MAGIC) + return 0; + bytes = le16_to_cpu(sbp->s_bytes); + if (bytes > BLOCK_SIZE) + return 0; + crc = crc32_le(le32_to_cpu(sbp->s_crc_seed), (unsigned char *)sbp, + sumoff); + crc = crc32_le(crc, sum, 4); + crc = crc32_le(crc, (unsigned char *)sbp + sumoff + 4, + bytes - sumoff - 4); + return crc == le32_to_cpu(sbp->s_sum); +} + +static int nilfs_sb2_bad_offset(struct nilfs_super_block *sbp, u64 offset) +{ + return offset < ((le64_to_cpu(sbp->s_nsegments) * + le32_to_cpu(sbp->s_blocks_per_segment)) << + (le32_to_cpu(sbp->s_log_block_size) + 10)); +} + +static void nilfs_release_super_block(struct the_nilfs *nilfs) +{ + int i; + + for (i = 0; i < 2; i++) { + if (nilfs->ns_sbp[i]) { + brelse(nilfs->ns_sbh[i]); + nilfs->ns_sbh[i] = NULL; + nilfs->ns_sbp[i] = NULL; + } + } +} + +void nilfs_fall_back_super_block(struct the_nilfs *nilfs) +{ + brelse(nilfs->ns_sbh[0]); + nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; + nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; + nilfs->ns_sbh[1] = NULL; + nilfs->ns_sbp[1] = NULL; +} + +void nilfs_swap_super_block(struct the_nilfs *nilfs) +{ + struct buffer_head *tsbh = nilfs->ns_sbh[0]; + struct nilfs_super_block *tsbp = nilfs->ns_sbp[0]; + + nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; + nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; + nilfs->ns_sbh[1] = tsbh; + nilfs->ns_sbp[1] = tsbp; +} + +static int nilfs_load_super_block(struct the_nilfs *nilfs, + struct super_block *sb, int blocksize, + struct nilfs_super_block **sbpp) +{ + struct nilfs_super_block **sbp = nilfs->ns_sbp; + struct buffer_head **sbh = nilfs->ns_sbh; + u64 sb2off = NILFS_SB2_OFFSET_BYTES(nilfs->ns_bdev->bd_inode->i_size); + int valid[2], swp = 0; + + sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize, + &sbh[0]); + sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]); + + if (!sbp[0]) { + if (!sbp[1]) { + printk(KERN_ERR "NILFS: unable to read superblock\n"); + return -EIO; + } + printk(KERN_WARNING + "NILFS warning: unable to read primary superblock\n"); + } else if (!sbp[1]) + printk(KERN_WARNING + "NILFS warning: unable to read secondary superblock\n"); + + valid[0] = nilfs_valid_sb(sbp[0]); + valid[1] = nilfs_valid_sb(sbp[1]); + swp = valid[1] && + (!valid[0] || + le64_to_cpu(sbp[1]->s_wtime) > le64_to_cpu(sbp[0]->s_wtime)); + + if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) { + brelse(sbh[1]); + sbh[1] = NULL; + sbp[1] = NULL; + swp = 0; + } + if (!valid[swp]) { + nilfs_release_super_block(nilfs); + printk(KERN_ERR "NILFS: Can't find nilfs on dev %s.\n", + sb->s_id); + return -EINVAL; + } + + if (swp) { + printk(KERN_WARNING "NILFS warning: broken superblock. " + "using spare superblock.\n"); + 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_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); + *sbpp = sbp[0]; + return 0; +} + /** * init_nilfs - initialize a NILFS instance. * @nilfs: the_nilfs structure @@ -352,16 +471,15 @@ nilfs_store_disk_layout(struct the_nilfs *nilfs, struct super_block *sb, int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) { struct super_block *sb = sbi->s_super; - struct buffer_head *sbh; struct nilfs_super_block *sbp; struct backing_dev_info *bdi; int blocksize; - int err = 0; + int err; down_write(&nilfs->ns_sem); if (nilfs_init(nilfs)) { /* Load values from existing the_nilfs */ - sbp = nilfs->ns_sbp; + sbp = nilfs->ns_sbp[0]; err = nilfs_store_magic_and_option(sb, sbp, data); if (err) goto out; @@ -377,36 +495,50 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) goto out; } - sbp = nilfs_load_super_block(sb, &sbh); - if (!sbp) { + blocksize = sb_min_blocksize(sb, BLOCK_SIZE); + if (!blocksize) { + printk(KERN_ERR "NILFS: unable to set blocksize\n"); err = -EINVAL; goto out; } + err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); + if (err) + goto out; + err = nilfs_store_magic_and_option(sb, sbp, data); if (err) goto failed_sbh; blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); if (sb->s_blocksize != blocksize) { - sbp = nilfs_reload_super_block(sb, &sbh, blocksize); - if (!sbp) { + int hw_blocksize = bdev_hardsect_size(sb->s_bdev); + + if (blocksize < hw_blocksize) { + printk(KERN_ERR + "NILFS: blocksize %d too small for device " + "(sector-size = %d).\n", + blocksize, hw_blocksize); err = -EINVAL; + goto failed_sbh; + } + nilfs_release_super_block(nilfs); + sb_set_blocksize(sb, blocksize); + + err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); + if (err) goto out; /* not failed_sbh; sbh is released automatically when reloading fails. */ - } } nilfs->ns_blocksize_bits = sb->s_blocksize_bits; - err = nilfs_store_disk_layout(nilfs, sb, sbp); + err = nilfs_store_disk_layout(nilfs, sbp); if (err) goto failed_sbh; sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); nilfs->ns_mount_state = le16_to_cpu(sbp->s_state); - nilfs->ns_sbh = sbh; - nilfs->ns_sbp = sbp; bdi = nilfs->ns_bdev->bd_inode_backing_dev_info; if (!bdi) @@ -443,7 +575,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data) return err; failed_sbh: - brelse(sbh); + nilfs_release_super_block(nilfs); goto out; } diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index d750e48257c..30fe58778d0 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -49,8 +49,10 @@ enum { * @ns_sem: semaphore for shared states * @ns_writer_mutex: mutex protecting ns_writer attach/detach * @ns_writer_refcount: number of referrers on ns_writer - * @ns_sbh: buffer head of the on-disk super block - * @ns_sbp: pointer to the super block data + * @ns_sbh: buffer heads of on-disk super blocks + * @ns_sbp: pointers to super block data + * @ns_sbwtime: previous write time of super blocks + * @ns_sbsize: size of valid data in super block * @ns_supers: list of nilfs super block structs * @ns_seg_seq: segment sequence counter * @ns_segnum: index number of the latest full segment. @@ -101,8 +103,10 @@ struct the_nilfs { * - protecting s_dirt in the super_block struct * (see nilfs_write_super) and the following fields. */ - struct buffer_head *ns_sbh; - struct nilfs_super_block *ns_sbp; + struct buffer_head *ns_sbh[2]; + struct nilfs_super_block *ns_sbp[2]; + time_t ns_sbwtime[2]; + unsigned ns_sbsize; unsigned ns_mount_state; struct list_head ns_supers; @@ -182,6 +186,10 @@ THE_NILFS_FNS(INIT, init) THE_NILFS_FNS(LOADED, loaded) THE_NILFS_FNS(DISCONTINUED, discontinued) +/* Minimum interval of periodical update of superblocks (in seconds) */ +#define NILFS_SB_FREQ 10 +#define NILFS_ALTSB_FREQ 60 /* spare superblock */ + void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64); struct the_nilfs *alloc_nilfs(struct block_device *); void put_nilfs(struct the_nilfs *); @@ -190,6 +198,8 @@ int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *); int nilfs_count_free_blocks(struct the_nilfs *, sector_t *); int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int); int nilfs_near_disk_full(struct the_nilfs *); +void nilfs_fall_back_super_block(struct the_nilfs *); +void nilfs_swap_super_block(struct the_nilfs *); static inline void get_nilfs(struct the_nilfs *nilfs) diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h index cbce6647f7f..1275b309953 100644 --- a/include/linux/nilfs2_fs.h +++ b/include/linux/nilfs2_fs.h @@ -252,6 +252,10 @@ struct nilfs_super_block { #define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved segments */ +/* + * bytes offset of secondary super block + */ +#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) /* * Maximal count of links to a file |