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[GFS2] Fix crc32 calculation in recovery.c 

Commit "[GFS2] split and annotate gfs2_log_head" resulted in an incorrect
checksum calculation for log headers. This patch corrects the
problem without resorting to copying the whole log header as
the previous code used to.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
hifive-unleashed-5.1
Steven Whitehouse 2006-10-31 14:44:50 -05:00
parent 5516762261
commit 2a2c98247b
1 changed files with 5 additions and 4 deletions
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9
fs/gfs2/recovery.c
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@ -136,6 +136,7 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
{
struct buffer_head *bh;
struct gfs2_log_header_host lh;
static const u32 nothing = 0;
u32 hash;
int error;
@ -143,11 +144,11 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
if (error)
return error;
memcpy(&lh, bh->b_data, sizeof(struct gfs2_log_header)); /* XXX */
lh.lh_hash = 0;
hash = gfs2_disk_hash((char *)&lh, sizeof(struct gfs2_log_header));
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;
gfs2_log_header_in(&lh, bh->b_data);
brelse(bh);
if (lh.lh_header.mh_magic != GFS2_MAGIC ||