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[PATCH] dm snapshot: fix metadata writing when suspending 

When suspending a device-mapper device, dm_suspend() sleeps until all
necessary I/O is completed.  This state is triggered by a callback from
persistent_commit().  But some I/O can still be issued *after* the callback
(to prepare the next metadata area for use if the current one is full).  This
patch delays the callback until after that I/O is complete.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mark McLoughlin 2006-10-03 01:15:27 -07:00 committed by Linus Torvalds
parent e4ff496db7
commit 927ffe7c9a
1 changed files with 10 additions and 10 deletions
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20
drivers/md/dm-exception-store.c
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@ -536,6 +536,16 @@ static void persistent_commit(struct exception_store *store,
if (r)
ps->valid = 0;
/*
* Have we completely filled the current area ?
*/
if (ps->current_committed == ps->exceptions_per_area) {
ps->current_committed = 0;
r = zero_area(ps, ps->current_area + 1);
if (r)
ps->valid = 0;
}
for (i = 0; i < ps->callback_count; i++) {
cb = ps->callbacks + i;
cb->callback(cb->context, r == 0 ? 1 : 0);
@ -543,16 +553,6 @@ static void persistent_commit(struct exception_store *store,
ps->callback_count = 0;
}
/*
* Have we completely filled the current area ?
*/
if (ps->current_committed == ps->exceptions_per_area) {
ps->current_committed = 0;
r = zero_area(ps, ps->current_area + 1);
if (r)
ps->valid = 0;
}
}
static void persistent_drop(struct exception_store *store)