From 927ffe7c9a156e259aae31c07dd76072c459ec57 Mon Sep 17 00:00:00 2001 From: Mark McLoughlin Date: Tue, 3 Oct 2006 01:15:27 -0700 Subject: [PATCH] [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 Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/dm-exception-store.c | 20 ++++++++++---------- 1 file 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)