nilfs2: refactor recovery logic routines

Most functions in recovery code take an argument of a super block
instance or a nilfs_sb_info struct for convenience sake.

This replaces them aggressively with a nilfs object by applying
__bread and __breadahead against routines using sb_bread and
sb_breadahead.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

3 files changed, 100 insertions, 73 deletions

diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index bae2a516b4ee..1c883b1074eb 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -110,8 +110,8 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi,
 }
 
 /**
- * calc_crc_cont - check CRC of blocks continuously
- * @sbi: nilfs_sb_info
+ * nilfs_compute_checksum - compute checksum of blocks continuously
+ * @nilfs: nilfs object
  * @bhs: buffer head of start block
  * @sum: place to store result
  * @offset: offset bytes in the first block
@@ -119,23 +119,25 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi,
  * @start: DBN of start block
  * @nblock: number of blocks to be checked
  */
-static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,
-                         u32 *sum, unsigned long offset, u64 check_bytes,
-                         sector_t start, unsigned long nblock)
+static int nilfs_compute_checksum(struct the_nilfs *nilfs,
+                                  struct buffer_head *bhs, u32 *sum,
+                                  unsigned long offset, u64 check_bytes,
+                                  sector_t start, unsigned long nblock)
 {
-        unsigned long blocksize = sbi->s_super->s_blocksize;
+        unsigned int blocksize = nilfs->ns_blocksize;
         unsigned long size;
         u32 crc;
 
         BUG_ON(offset >= blocksize);
         check_bytes -= offset;
         size = min_t(u64, check_bytes, blocksize - offset);
-        crc = crc32_le(sbi->s_nilfs->ns_crc_seed,
+        crc = crc32_le(nilfs->ns_crc_seed,
                        (unsigned char *)bhs->b_data + offset, size);
         if (--nblock > 0) {
                 do {
-                        struct buffer_head *bh
-                                = sb_bread(sbi->s_super, ++start);
+                        struct buffer_head *bh;
+
+                        bh = __bread(nilfs->ns_bdev, ++start, blocksize);
                         if (!bh)
                                 return -EIO;
                         check_bytes -= size;
@@ -150,12 +152,12 @@ static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,
 
 /**
  * nilfs_read_super_root_block - read super root block
- * @sb: super_block
+ * @nilfs: nilfs object
  * @sr_block: disk block number of the super root block
  * @pbh: address of a buffer_head pointer to return super root buffer
  * @check: CRC check flag
  */
-int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
+int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
                                 struct buffer_head **pbh, int check)
 {
         struct buffer_head *bh_sr;
@@ -164,7 +166,7 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
         int ret;
 
         *pbh = NULL;
-        bh_sr = sb_bread(sb, sr_block);
+        bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize);
         if (unlikely(!bh_sr)) {
                 ret = NILFS_SEG_FAIL_IO;
                 goto failed;
@@ -174,12 +176,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
         if (check) {
                 unsigned bytes = le16_to_cpu(sr->sr_bytes);
 
-                if (bytes == 0 || bytes > sb->s_blocksize) {
+                if (bytes == 0 || bytes > nilfs->ns_blocksize) {
                         ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
                         goto failed_bh;
                 }
-                if (calc_crc_cont(NILFS_SB(sb), bh_sr, &crc,
-                                  sizeof(sr->sr_sum), bytes, sr_block, 1)) {
+                if (nilfs_compute_checksum(
+                            nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes,
+                            sr_block, 1)) {
                         ret = NILFS_SEG_FAIL_IO;
                         goto failed_bh;
                 }
@@ -200,13 +203,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
 
 /**
  * load_segment_summary - read segment summary of the specified partial segment
- * @sbi: nilfs_sb_info
+ * @nilfs: nilfs object
  * @pseg_start: start disk block number of partial segment
  * @seg_seq: sequence number requested
  * @ssi: pointer to nilfs_segsum_info struct to store information
  */
 static int
-load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
+load_segment_summary(struct the_nilfs *nilfs, sector_t pseg_start,
                      u64 seg_seq, struct nilfs_segsum_info *ssi)
 {
         struct buffer_head *bh_sum;
@@ -215,7 +218,7 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
         u32 crc;
         int ret = NILFS_SEG_FAIL_IO;
 
-        bh_sum = sb_bread(sbi->s_super, pseg_start);
+        bh_sum = __bread(nilfs->ns_bdev, pseg_start, nilfs->ns_blocksize);
         if (!bh_sum)
                 goto out;
 
@@ -226,22 +229,21 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
                 ret = NILFS_SEG_FAIL_MAGIC;
                 goto failed;
         }
-        store_segsum_info(ssi, sum, sbi->s_super->s_blocksize);
+        store_segsum_info(ssi, sum, nilfs->ns_blocksize);
         if (seg_seq != ssi->seg_seq) {
                 ret = NILFS_SEG_FAIL_SEQ;
                 goto failed;
         }
 
         nblock = ssi->nblocks;
-        if (unlikely(nblock == 0 ||
-                     nblock > sbi->s_nilfs->ns_blocks_per_segment)) {
+        if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) {
                 /* This limits the number of blocks read in the CRC check */
                 ret = NILFS_SEG_FAIL_CONSISTENCY;
                 goto failed;
         }
-        if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum),
-                          ((u64)nblock << sbi->s_super->s_blocksize_bits),
-                          pseg_start, nblock)) {
+        if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum),
+                                   ((u64)nblock << nilfs->ns_blocksize_bits),
+                                   pseg_start, nblock)) {
                 ret = NILFS_SEG_FAIL_IO;
                 goto failed;
         }
@@ -255,8 +257,16 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
         return ret;
 }
 
-static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
-                        unsigned int *offset, unsigned int bytes)
+/**
+ * nilfs_read_summary_info - read an item on summary blocks of a log
+ * @nilfs: nilfs object
+ * @pbh: the current buffer head on summary blocks [in, out]
+ * @offset: the current byte offset on summary blocks [in, out]
+ * @bytes: byte size of the item to be read
+ */
+static void *nilfs_read_summary_info(struct the_nilfs *nilfs,
+                                     struct buffer_head **pbh,
+                                     unsigned int *offset, unsigned int bytes)
 {
         void *ptr;
         sector_t blocknr;
@@ -265,7 +275,8 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
         if (bytes > (*pbh)->b_size - *offset) {
                 blocknr = (*pbh)->b_blocknr;
                 brelse(*pbh);
-                *pbh = sb_bread(sb, blocknr + 1);
+                *pbh = __bread(nilfs->ns_bdev, blocknr + 1,
+                               nilfs->ns_blocksize);
                 if (unlikely(!*pbh))
                         return NULL;
                 *offset = 0;
@@ -275,9 +286,18 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
         return ptr;
 }
 
-static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,
-                        unsigned int *offset, unsigned int bytes,
-                        unsigned long count)
+/**
+ * nilfs_skip_summary_info - skip items on summary blocks of a log
+ * @nilfs: nilfs object
+ * @pbh: the current buffer head on summary blocks [in, out]
+ * @offset: the current byte offset on summary blocks [in, out]
+ * @bytes: byte size of the item to be skipped
+ * @count: number of items to be skipped
+ */
+static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
+                                    struct buffer_head **pbh,
+                                    unsigned int *offset, unsigned int bytes,
+                                    unsigned long count)
 {
         unsigned int rest_item_in_current_block
                 = ((*pbh)->b_size - *offset) / bytes;
@@ -294,26 +314,33 @@ static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,
                 *offset = bytes * (count - (bcnt - 1) * nitem_per_block);
 
                 brelse(*pbh);
-                *pbh = sb_bread(sb, blocknr + bcnt);
+                *pbh = __bread(nilfs->ns_bdev, blocknr + bcnt,
+                               nilfs->ns_blocksize);
         }
 }
 
-static int
-collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
-                           struct nilfs_segsum_info *ssi,
-                           struct list_head *head)
+/**
+ * nilfs_scan_dsync_log - get block information of a log written for data sync
+ * @nilfs: nilfs object
+ * @start_blocknr: start block number of the log
+ * @ssi: log summary information
+ * @head: list head to add nilfs_recovery_block struct
+ */
+static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,
+                                struct nilfs_segsum_info *ssi,
+                                struct list_head *head)
 {
         struct buffer_head *bh;
         unsigned int offset;
         unsigned long nfinfo = ssi->nfinfo;
-        sector_t blocknr = sum_blocknr + ssi->nsumblk;
+        sector_t blocknr = start_blocknr + ssi->nsumblk;
         ino_t ino;
         int err = -EIO;
 
         if (!nfinfo)
                 return 0;
 
-        bh = sb_bread(sbi->s_super, sum_blocknr);
+        bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
         if (unlikely(!bh))
                 goto out;
 
@@ -323,7 +350,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
                 unsigned long nblocks, ndatablk, nnodeblk;
                 struct nilfs_finfo *finfo;
 
-                finfo = segsum_get(sbi->s_super, &bh, &offset, sizeof(*finfo));
+                finfo = nilfs_read_summary_info(nilfs, &bh, &offset,
+                                                sizeof(*finfo));
                 if (unlikely(!finfo))
                         goto out;
 
@@ -336,8 +364,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
                         struct nilfs_recovery_block *rb;
                         struct nilfs_binfo_v *binfo;
 
-                        binfo = segsum_get(sbi->s_super, &bh, &offset,
-                                           sizeof(*binfo));
+                        binfo = nilfs_read_summary_info(nilfs, &bh, &offset,
+                                                        sizeof(*binfo));
                         if (unlikely(!binfo))
                                 goto out;
 
@@ -355,9 +383,9 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
                 }
                 if (--nfinfo == 0)
                         break;
-                blocknr += nnodeblk; /* always 0 for the data sync segments */
-                segsum_skip(sbi->s_super, &bh, &offset, sizeof(__le64),
-                            nnodeblk);
+                blocknr += nnodeblk; /* always 0 for data sync logs */
+                nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64),
+                                        nnodeblk);
                 if (unlikely(!bh))
                         goto out;
         }
@@ -467,14 +495,14 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
         return err;
 }
 
-static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,
+static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
                                      struct nilfs_recovery_block *rb,
                                      struct page *page)
 {
         struct buffer_head *bh_org;
         void *kaddr;
 
-        bh_org = sb_bread(sbi->s_super, rb->blocknr);
+        bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);
         if (unlikely(!bh_org))
                 return -EIO;
 
@@ -485,13 +513,14 @@ static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,
         return 0;
 }
 
-static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
-                                struct list_head *head,
-                                unsigned long *nr_salvaged_blocks)
+static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
+                                      struct nilfs_sb_info *sbi,
+                                      struct list_head *head,
+                                      unsigned long *nr_salvaged_blocks)
 {
         struct inode *inode;
         struct nilfs_recovery_block *rb, *n;
-        unsigned blocksize = sbi->s_super->s_blocksize;
+        unsigned blocksize = nilfs->ns_blocksize;
         struct page *page;
         loff_t pos;
         int err = 0, err2 = 0;
@@ -511,7 +540,7 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
                 if (unlikely(err))
                         goto failed_inode;
 
-                err = nilfs_recovery_copy_block(sbi, rb, page);
+                err = nilfs_recovery_copy_block(nilfs, rb, page);
                 if (unlikely(err))
                         goto failed_page;
 
@@ -551,8 +580,8 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
 /**
  * nilfs_do_roll_forward - salvage logical segments newer than the latest
  * checkpoint
+ * @nilfs: nilfs object
  * @sbi: nilfs_sb_info
- * @nilfs: the_nilfs
  * @ri: pointer to a nilfs_recovery_info
  */
 static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
@@ -582,7 +611,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
 
         while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {
 
-                ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);
+                ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi);
                 if (ret) {
                         if (ret == NILFS_SEG_FAIL_IO) {
                                 err = -EIO;
@@ -610,13 +639,14 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
                         if (!NILFS_SEG_DSYNC(&ssi))
                                 goto confused;
 
-                        err = collect_blocks_from_segsum(
-                                sbi, pseg_start, &ssi, &dsync_blocks);
+                        err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi,
+                                                   &dsync_blocks);
                         if (unlikely(err))
                                 goto failed;
                         if (NILFS_SEG_LOGEND(&ssi)) {
-                                err = recover_dsync_blocks(
-                                        sbi, &dsync_blocks, &nsalvaged_blocks);
+                                err = nilfs_recover_dsync_blocks(
+                                        nilfs, sbi, &dsync_blocks,
+                                        &nsalvaged_blocks);
                                 if (unlikely(err))
                                         goto failed;
                                 state = RF_INIT_ST;
@@ -653,7 +683,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
         }
  out:
         dispose_recovery_list(&dsync_blocks);
-        nilfs_detach_writer(sbi->s_nilfs, sbi);
+        nilfs_detach_writer(nilfs, sbi);
         return err;
 
  confused:
@@ -667,7 +697,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
 }
 
 static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
-                                      struct nilfs_sb_info *sbi,
                                       struct nilfs_recovery_info *ri)
 {
         struct buffer_head *bh;
@@ -677,7 +706,7 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
             nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))
                 return;
 
-        bh = sb_getblk(sbi->s_super, ri->ri_lsegs_start);
+        bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);
         BUG_ON(!bh);
         memset(bh->b_data, 0, bh->b_size);
         set_buffer_dirty(bh);
@@ -751,7 +780,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
                         goto failed;
                 }
 
-                nilfs_finish_roll_forward(nilfs, sbi, ri);
+                nilfs_finish_roll_forward(nilfs, ri);
         }
 
  failed:
@@ -762,7 +791,6 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
 /**
  * nilfs_search_super_root - search the latest valid super root
  * @nilfs: the_nilfs
- * @sbi: nilfs_sb_info
  * @ri: pointer to a nilfs_recovery_info struct to store search results.
  *
  * nilfs_search_super_root() looks for the latest super-root from a partial
@@ -776,7 +804,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
  *
  * %-EIO - I/O error
  */
-int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
+int nilfs_search_super_root(struct the_nilfs *nilfs,
                             struct nilfs_recovery_info *ri)
 {
         struct nilfs_segsum_info ssi;
@@ -801,11 +829,10 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
         /* Read ahead segment */
         b = seg_start;
         while (b <= seg_end)
-                sb_breadahead(sbi->s_super, b++);
+                __breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize);
 
         for (;;) {
-                /* Load segment summary */
-                ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);
+                ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi);
                 if (ret) {
                         if (ret == NILFS_SEG_FAIL_IO)
                                 goto failed;
@@ -836,7 +863,8 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
                 if (pseg_start == seg_start) {
                         nilfs_get_segment_range(nilfs, nextnum, &b, &end);
                         while (b <= end)
-                                sb_breadahead(sbi->s_super, b++);
+                                __breadahead(nilfs->ns_bdev, b++,
+                                             nilfs->ns_blocksize);
                 }
                 if (!NILFS_SEG_HAS_SR(&ssi)) {
                         if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) {
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 01e20dbb217d..d6bb67ee7bc8 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -234,9 +234,9 @@ extern int nilfs_attach_segment_constructor(struct nilfs_sb_info *);
 extern void nilfs_detach_segment_constructor(struct nilfs_sb_info *);
 
 /* recovery.c */
-extern int nilfs_read_super_root_block(struct super_block *, sector_t,
+extern int nilfs_read_super_root_block(struct the_nilfs *, sector_t,
                                        struct buffer_head **, int);
-extern int nilfs_search_super_root(struct the_nilfs *, struct nilfs_sb_info *,
+extern int nilfs_search_super_root(struct the_nilfs *,
                                    struct nilfs_recovery_info *);
 extern int nilfs_recover_logical_segments(struct the_nilfs *,
                                           struct nilfs_sb_info *,
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 870a1273e9b0..a94908e4d6d7 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -159,8 +159,7 @@ 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 +168,7 @@ 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;
 
@@ -285,13 +284,13 @@ 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;
         }
 
-        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;