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authorAndreas Gruenbacher <agruenba@redhat.com>2018-01-16 23:07:57 +0100
committerBob Peterson <rpeterso@redhat.com>2018-01-22 07:06:15 -0700
commit0ff5916ad4eb857e03e7586665d1c022ef3277f6 (patch)
tree0aa2f49c36c8c7d574a8d037e6495119e63beabd /fs/gfs2
parent88b65ce5fdd9ac75df1534cf6503db0ccb230ecb (diff)
downloadlinux-0ff5916ad4eb857e03e7586665d1c022ef3277f6.tar.bz2
gfs2: Get rid of gfs2_log_header_in
Get rid of gfs2_log_header_in by integrating it into get_log_header. Clean up the crc32 computations and use the same functions for encoding and decoding to make things less confusing. Eliminate lh_hash from gfs2_log_header_host which is completely useless. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/incore.h1
-rw-r--r--fs/gfs2/log.c2
-rw-r--r--fs/gfs2/recovery.c44
3 files changed, 17 insertions, 30 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 9d4d7367175f..e0557b8a590a 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -44,7 +44,6 @@ struct gfs2_log_header_host {
u32 lh_flags; /* GFS2_LOG_HEAD_... */
u32 lh_tail; /* Block number of log tail */
u32 lh_blkno;
- u32 lh_hash;
};
/*
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index b9889ae5fd7c..c27cbcebfe88 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -680,7 +680,7 @@ void gfs2_write_log_header(struct gfs2_sbd *sdp, u64 seq, u32 tail,
lh->lh_flags = cpu_to_be32(flags);
lh->lh_tail = cpu_to_be32(tail);
lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
- hash = gfs2_disk_hash(page_address(page), sizeof(struct gfs2_log_header));
+ hash = ~crc32(~0, lh, sizeof(*lh));
lh->lh_hash = cpu_to_be32(hash);
gfs2_log_write_page(sdp, page);
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 5d3431219425..975f32166dfe 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -118,22 +118,6 @@ void gfs2_revoke_clean(struct gfs2_jdesc *jd)
}
}
-static int gfs2_log_header_in(struct gfs2_log_header_host *lh, const void *buf)
-{
- const struct gfs2_log_header *str = buf;
-
- if (str->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
- str->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH))
- return 1;
-
- lh->lh_sequence = be64_to_cpu(str->lh_sequence);
- lh->lh_flags = be32_to_cpu(str->lh_flags);
- lh->lh_tail = be32_to_cpu(str->lh_tail);
- lh->lh_blkno = be32_to_cpu(str->lh_blkno);
- lh->lh_hash = be32_to_cpu(str->lh_hash);
- return 0;
-}
-
/**
* get_log_header - read the log header for a given segment
* @jd: the journal
@@ -151,29 +135,33 @@ static int gfs2_log_header_in(struct gfs2_log_header_host *lh, const void *buf)
static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
struct gfs2_log_header_host *head)
{
+ struct gfs2_log_header *lh;
struct buffer_head *bh;
- struct gfs2_log_header_host uninitialized_var(lh);
- const u32 nothing = 0;
u32 hash;
int error;
error = gfs2_replay_read_block(jd, blk, &bh);
if (error)
return error;
+ lh = (void *)bh->b_data;
- hash = crc32_le((u32)~0, bh->b_data, sizeof(struct gfs2_log_header) -
- sizeof(u32));
- hash = crc32_le(hash, (unsigned char const *)&nothing, sizeof(nothing));
- hash ^= (u32)~0;
- error = gfs2_log_header_in(&lh, bh->b_data);
- brelse(bh);
+ hash = crc32(~0, lh, sizeof(*lh) - 4);
+ hash = ~crc32_le_shift(hash, 4); /* assume lh_hash is zero */
- if (error || lh.lh_blkno != blk || lh.lh_hash != hash)
- return 1;
+ 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;
- *head = lh;
+ brelse(bh);
- return 0;
+ 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;
}
/**