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nilfs2: do not use nilfs_segsum_info structure in recovery code
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This will get rid of nilfs_segsum_info use from recovery functions for
simplicity.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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Ryusuke Konishi committed Jul 23, 2010
1 parent 354fa8b commit 8565548
Showing 1 changed file with 37 additions and 54 deletions.
91 changes: 37 additions & 54 deletions fs/nilfs2/recovery.c
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Original file line number Diff line number Diff line change
Expand Up @@ -91,24 +91,6 @@ static int nilfs_warn_segment_error(int err)
return -EINVAL;
}

static void store_segsum_info(struct nilfs_segsum_info *ssi,
struct nilfs_segment_summary *sum,
unsigned int blocksize)
{
ssi->flags = le16_to_cpu(sum->ss_flags);
ssi->seg_seq = le64_to_cpu(sum->ss_seq);
ssi->ctime = le64_to_cpu(sum->ss_create);
ssi->next = le64_to_cpu(sum->ss_next);
ssi->nblocks = le32_to_cpu(sum->ss_nblocks);
ssi->nfinfo = le32_to_cpu(sum->ss_nfinfo);
ssi->sumbytes = le32_to_cpu(sum->ss_sumbytes);

ssi->nsumblk = DIV_ROUND_UP(ssi->sumbytes, blocksize);
ssi->nfileblk = ssi->nblocks - ssi->nsumblk - !!NILFS_SEG_HAS_SR(ssi);

/* need to verify ->ss_bytes field if read ->ss_cno */
}

/**
* nilfs_compute_checksum - compute checksum of blocks continuously
* @nilfs: nilfs object
Expand Down Expand Up @@ -328,29 +310,31 @@ static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
* 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
* @sum: 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 nilfs_segment_summary *sum,
struct list_head *head)
{
struct buffer_head *bh;
unsigned int offset;
unsigned long nfinfo = ssi->nfinfo;
sector_t blocknr = start_blocknr + ssi->nsumblk;
u32 nfinfo, sumbytes;
sector_t blocknr;
ino_t ino;
int err = -EIO;

nfinfo = le32_to_cpu(sum->ss_nfinfo);
if (!nfinfo)
return 0;

sumbytes = le32_to_cpu(sum->ss_sumbytes);
blocknr = start_blocknr + DIV_ROUND_UP(sumbytes, nilfs->ns_blocksize);
bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
if (unlikely(!bh))
goto out;

offset = le16_to_cpu(
((struct nilfs_segment_summary *)bh->b_data)->ss_bytes);
offset = le16_to_cpu(sum->ss_bytes);
for (;;) {
unsigned long nblocks, ndatablk, nnodeblk;
struct nilfs_finfo *finfo;
Expand Down Expand Up @@ -593,12 +577,12 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
struct nilfs_sb_info *sbi,
struct nilfs_recovery_info *ri)
{
struct nilfs_segsum_info ssi;
struct buffer_head *bh_sum = NULL;
struct nilfs_segment_summary *sum;
sector_t pseg_start;
sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */
unsigned long nsalvaged_blocks = 0;
unsigned int flags;
u64 seg_seq;
__u64 segnum, nextnum = 0;
int empty_seg = 0;
Expand Down Expand Up @@ -633,32 +617,34 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
goto strayed;
}

store_segsum_info(&ssi, sum, nilfs->ns_blocksize);
if (unlikely(NILFS_SEG_HAS_SR(&ssi)))
flags = le16_to_cpu(sum->ss_flags);
if (flags & NILFS_SS_SR)
goto confused;

/* Found a valid partial segment; do recovery actions */
nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next);
nextnum = nilfs_get_segnum_of_block(nilfs,
le64_to_cpu(sum->ss_next));
empty_seg = 0;
nilfs->ns_ctime = ssi.ctime;
if (!(ssi.flags & NILFS_SS_GC))
nilfs->ns_nongc_ctime = ssi.ctime;
nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
if (!(flags & NILFS_SS_GC))
nilfs->ns_nongc_ctime = nilfs->ns_ctime;

switch (state) {
case RF_INIT_ST:
if (!NILFS_SEG_LOGBGN(&ssi) || !NILFS_SEG_DSYNC(&ssi))
if (!(flags & NILFS_SS_LOGBGN) ||
!(flags & NILFS_SS_SYNDT))
goto try_next_pseg;
state = RF_DSYNC_ST;
/* Fall through */
case RF_DSYNC_ST:
if (!NILFS_SEG_DSYNC(&ssi))
if (!(flags & NILFS_SS_SYNDT))
goto confused;

err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi,
err = nilfs_scan_dsync_log(nilfs, pseg_start, sum,
&dsync_blocks);
if (unlikely(err))
goto failed;
if (NILFS_SEG_LOGEND(&ssi)) {
if (flags & NILFS_SS_LOGEND) {
err = nilfs_recover_dsync_blocks(
nilfs, sbi, &dsync_blocks,
&nsalvaged_blocks);
Expand All @@ -672,7 +658,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
try_next_pseg:
if (pseg_start == ri->ri_lsegs_end)
break;
pseg_start += ssi.nblocks;
pseg_start += le32_to_cpu(sum->ss_nblocks);
if (pseg_start < seg_end)
continue;
goto feed_segment;
Expand Down Expand Up @@ -822,12 +808,13 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
int nilfs_search_super_root(struct the_nilfs *nilfs,
struct nilfs_recovery_info *ri)
{
struct nilfs_segsum_info ssi;
struct buffer_head *bh_sum = NULL;
struct nilfs_segment_summary *sum;
sector_t pseg_start, pseg_end, sr_pseg_start = 0;
sector_t seg_start, seg_end; /* range of full segment (block number) */
sector_t b, end;
unsigned long nblocks;
unsigned int flags;
u64 seg_seq;
__u64 segnum, nextnum = 0;
__u64 cno;
Expand Down Expand Up @@ -862,8 +849,8 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
goto strayed;
}

store_segsum_info(&ssi, sum, nilfs->ns_blocksize);
pseg_end = pseg_start + ssi.nblocks - 1;
nblocks = le32_to_cpu(sum->ss_nblocks);
pseg_end = pseg_start + nblocks - 1;
if (unlikely(pseg_end > seg_end)) {
ret = NILFS_SEG_FAIL_CONSISTENCY;
goto strayed;
Expand All @@ -873,11 +860,13 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
ri->ri_pseg_start = pseg_start;
ri->ri_seq = seg_seq;
ri->ri_segnum = segnum;
nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next);
nextnum = nilfs_get_segnum_of_block(nilfs,
le64_to_cpu(sum->ss_next));
ri->ri_nextnum = nextnum;
empty_seg = 0;

if (!NILFS_SEG_HAS_SR(&ssi) && !scan_newer) {
flags = le16_to_cpu(sum->ss_flags);
if (!(flags & NILFS_SS_SR) && !scan_newer) {
/* This will never happen because a superblock
(last_segment) always points to a pseg
having a super root. */
Expand All @@ -891,12 +880,12 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
__breadahead(nilfs->ns_bdev, b++,
nilfs->ns_blocksize);
}
if (!NILFS_SEG_HAS_SR(&ssi)) {
if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) {
if (!(flags & NILFS_SS_SR)) {
if (!ri->ri_lsegs_start && (flags & NILFS_SS_LOGBGN)) {
ri->ri_lsegs_start = pseg_start;
ri->ri_lsegs_start_seq = seg_seq;
}
if (NILFS_SEG_LOGEND(&ssi))
if (flags & NILFS_SS_LOGEND)
ri->ri_lsegs_end = pseg_start;
goto try_next_pseg;
}
Expand All @@ -907,12 +896,12 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
ri->ri_lsegs_start = ri->ri_lsegs_end = 0;

nilfs_dispose_segment_list(&segments);
nilfs->ns_pseg_offset = (sr_pseg_start = pseg_start)
+ ssi.nblocks - seg_start;
sr_pseg_start = pseg_start;
nilfs->ns_pseg_offset = pseg_start + nblocks - seg_start;
nilfs->ns_seg_seq = seg_seq;
nilfs->ns_segnum = segnum;
nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */
nilfs->ns_ctime = ssi.ctime;
nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
nilfs->ns_nextnum = nextnum;

if (scan_newer)
Expand All @@ -923,15 +912,9 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
scan_newer = 1;
}

/* reset region for roll-forward */
pseg_start += ssi.nblocks;
if (pseg_start < seg_end)
continue;
goto feed_segment;

try_next_pseg:
/* Standing on a course, or met an inconsistent state */
pseg_start += ssi.nblocks;
pseg_start += nblocks;
if (pseg_start < seg_end)
continue;
goto feed_segment;
Expand Down

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