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authorAbhi Das <adas@redhat.com>2018-11-09 09:54:18 -0600
committerAndreas Gruenbacher <agruenba@redhat.com>2018-12-11 17:50:36 +0100
commit40e0e61e366bed56b71edb3b970245165090ec9a (patch)
treebe18946d9501c6f3e12deab6430d982442ba1d00 /fs/gfs2/recovery.c
parent5b84609532d6e48a769a735d214e2cd705ed395e (diff)
gfs2: add a helper function to get_log_header that can be used elsewhere
Move and re-order the error checks and hash/crc computations into another function __get_log_header() so it can be used in scenarios where buffer_heads are not being used for the log header. Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/recovery.c')
-rw-r--r--fs/gfs2/recovery.c53
1 files changed, 32 insertions, 21 deletions
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index b0717a074543..2dac43065382 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -120,6 +120,35 @@ void gfs2_revoke_clean(struct gfs2_jdesc *jd)
}
}
+int __get_log_header(struct gfs2_sbd *sdp, const struct gfs2_log_header *lh,
+ unsigned int blkno, struct gfs2_log_header_host *head)
+{
+ u32 hash, crc;
+
+ if (lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
+ lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
+ (blkno && be32_to_cpu(lh->lh_blkno) != blkno))
+ return 1;
+
+ hash = crc32(~0, lh, LH_V1_SIZE - 4);
+ hash = ~crc32_le_shift(hash, 4); /* assume lh_hash is zero */
+
+ if (be32_to_cpu(lh->lh_hash) != hash)
+ return 1;
+
+ crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
+ sdp->sd_sb.sb_bsize - LH_V1_SIZE - 4);
+
+ if ((lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc))
+ return 1;
+
+ head->lh_sequence = be64_to_cpu(lh->lh_sequence);
+ head->lh_flags = be32_to_cpu(lh->lh_flags);
+ head->lh_tail = be32_to_cpu(lh->lh_tail);
+ head->lh_blkno = be32_to_cpu(lh->lh_blkno);
+
+ return 0;
+}
/**
* get_log_header - read the log header for a given segment
* @jd: the journal
@@ -137,36 +166,18 @@ void gfs2_revoke_clean(struct gfs2_jdesc *jd)
static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
struct gfs2_log_header_host *head)
{
- struct gfs2_log_header *lh;
+ struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
struct buffer_head *bh;
- u32 hash, crc;
int error;
error = gfs2_replay_read_block(jd, blk, &bh);
if (error)
return error;
- lh = (void *)bh->b_data;
-
- hash = crc32(~0, lh, LH_V1_SIZE - 4);
- hash = ~crc32_le_shift(hash, 4); /* assume lh_hash is zero */
-
- crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
- bh->b_size - LH_V1_SIZE - 4);
-
- error = lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
- lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
- be32_to_cpu(lh->lh_blkno) != blk ||
- be32_to_cpu(lh->lh_hash) != hash ||
- (lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc);
+ error = __get_log_header(sdp, (const struct gfs2_log_header *)bh->b_data,
+ blk, head);
brelse(bh);
- if (!error) {
- head->lh_sequence = be64_to_cpu(lh->lh_sequence);
- head->lh_flags = be32_to_cpu(lh->lh_flags);
- head->lh_tail = be32_to_cpu(lh->lh_tail);
- head->lh_blkno = be32_to_cpu(lh->lh_blkno);
- }
return error;
}