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authorMark McLoughlin <markmc@redhat.com>2006-10-03 01:15:27 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-03 08:04:14 -0700
commit927ffe7c9a156e259aae31c07dd76072c459ec57 (patch)
tree1353a603c32d2bd23331abbac917a0b0574ff6ea /drivers/md/dm-exception-store.c
parente4ff496db72473949ddfe29a37471969d2f1d4ee (diff)
[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>
Diffstat (limited to 'drivers/md/dm-exception-store.c')
-rw-r--r--drivers/md/dm-exception-store.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 002417da1224..99cdffa7fbfe 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -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)