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-rw-r--r--fs/gfs2/recovery.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 8bc182c7e2ef..5ada38c99a2c 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -116,6 +116,22 @@ void gfs2_revoke_clean(struct gfs2_sbd *sdp)
}
}
+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
@@ -147,12 +163,10 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
sizeof(u32));
hash = crc32_le(hash, (unsigned char const *)&nothing, sizeof(nothing));
hash ^= (u32)~0;
- gfs2_log_header_in(&lh, bh->b_data);
+ error = gfs2_log_header_in(&lh, bh->b_data);
brelse(bh);
- if (lh.lh_header.mh_magic != GFS2_MAGIC ||
- lh.lh_header.mh_type != GFS2_METATYPE_LH ||
- lh.lh_blkno != blk || lh.lh_hash != hash)
+ if (error || lh.lh_blkno != blk || lh.lh_hash != hash)
return 1;
*head = lh;
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