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[GFS2] Use list_for_each_entry_safe_reverse in gfs2_ail1_start() 

This is an attempt to fix Red Hat bz 204364. I don't hit it all
the time, but with these changes, running postmark which used to
trigger it on a regular basis no longer appears to. So I'm not
saying that its 100% certain that its fixed, but it does look
promising at the moment.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2006-09-19 11:17:38 -04:00
parent 7d308590ae
commit 74669416f7
1 changed files with 9 additions and 10 deletions
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19
fs/gfs2/log.c
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@ -62,8 +62,9 @@ void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
{
struct list_head *head = &sdp->sd_ail1_list;
u64 sync_gen;
struct list_head *first, *tmp;
struct gfs2_ail *first_ai, *ai;
struct list_head *first;
struct gfs2_ail *first_ai, *ai, *tmp;
int done = 0;
gfs2_log_lock(sdp);
if (list_empty(head)) {
@ -75,27 +76,25 @@ void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
first = head->prev;
first_ai = list_entry(first, struct gfs2_ail, ai_list);
first_ai->ai_sync_gen = sync_gen;
gfs2_ail1_start_one(sdp, first_ai);
gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
if (flags & DIO_ALL)
first = NULL;
for (;;) {
while(!done) {
if (first && (head->prev != first ||
gfs2_ail1_empty_one(sdp, first_ai, 0)))
break;
for (tmp = head->prev; tmp != head; tmp = tmp->prev) {
ai = list_entry(tmp, struct gfs2_ail, ai_list);
done = 1;
list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
if (ai->ai_sync_gen >= sync_gen)
continue;
ai->ai_sync_gen = sync_gen;
gfs2_ail1_start_one(sdp, ai);
gfs2_ail1_start_one(sdp, ai); /* This may drop log lock */
done = 0;
break;
}
if (tmp == head)
break;
}
gfs2_log_unlock(sdp);