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authorBob Peterson <rpeterso@redhat.com>2018-01-17 00:01:33 +0100
committerBob Peterson <rpeterso@redhat.com>2018-01-23 15:38:53 +0100
commitc1696fb85d33194cf65c7ebfc82a75696299c3a3 (patch)
treee6c2faba8786f73db8270822c4fb263cad57b207 /fs/gfs2/recovery.c
parentgfs2: Get rid of gfs2_log_header_in (diff)
downloadlinux-c1696fb85d33194cf65c7ebfc82a75696299c3a3.tar.xz
linux-c1696fb85d33194cf65c7ebfc82a75696299c3a3.zip
GFS2: Introduce new gfs2_log_header_v2
This patch adds a new structure called gfs2_log_header_v2 which is used to store expanded fields into previously unused areas of the log headers (i.e., this change is backwards compatible). Some of these are used for debug purposes so we can backtrack when problems occur. Others are reserved for future expansion. This patch is based on a prototype from Steve Whitehouse. 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.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 975f32166dfe..b6b258998bcd 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -14,6 +14,7 @@
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
+#include <linux/crc32c.h>
#include "gfs2.h"
#include "incore.h"
@@ -137,7 +138,7 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
{
struct gfs2_log_header *lh;
struct buffer_head *bh;
- u32 hash;
+ u32 hash, crc;
int error;
error = gfs2_replay_read_block(jd, blk, &bh);
@@ -145,13 +146,17 @@ static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
return error;
lh = (void *)bh->b_data;
- hash = crc32(~0, lh, sizeof(*lh) - 4);
+ 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;
+ be32_to_cpu(lh->lh_hash) != hash ||
+ (lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc);
brelse(bh);
@@ -372,9 +377,9 @@ static void clean_journal(struct gfs2_jdesc *jd,
sdp->sd_log_flush_head = head->lh_blkno;
gfs2_replay_incr_blk(jd, &sdp->sd_log_flush_head);
- gfs2_write_log_header(sdp, head->lh_sequence + 1, 0,
- GFS2_LOG_HEAD_UNMOUNT, REQ_PREFLUSH |
- REQ_FUA | REQ_META | REQ_SYNC);
+ gfs2_write_log_header(sdp, jd, head->lh_sequence + 1, 0,
+ GFS2_LOG_HEAD_UNMOUNT | GFS2_LOG_HEAD_RECOVERY,
+ REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC);
}