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dm thin: always fallback the pool mode if commit fails

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Rename commit_or_fallback() to commit().  Now all previous calls to
commit() will trigger the pool mode to fallback if the commit fails.

Also, check the error returned from commit() in alloc_data_block().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Joe Thornber 2013-12-04 15:05:36 -05:00 committed by Mike Snitzer
parent 4a02b34e0c
commit 020cc3b5e2
1 changed files with 15 additions and 22 deletions
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37
drivers/md/dm-thin.c
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@ -883,32 +883,23 @@ static void schedule_zero(struct thin_c *tc, dm_block_t virt_block,
}
}
static int commit(struct pool *pool)
{
int r;
r = dm_pool_commit_metadata(pool->pmd);
if (r)
DMERR_LIMIT("%s: commit failed: error = %d",
dm_device_name(pool->pool_md), r);
return r;
}
/*
* A non-zero return indicates read_only or fail_io mode.
* Many callers don't care about the return value.
*/
static int commit_or_fallback(struct pool *pool)
static int commit(struct pool *pool)
{
int r;
if (get_pool_mode(pool) != PM_WRITE)
return -EINVAL;
r = commit(pool);
if (r)
r = dm_pool_commit_metadata(pool->pmd);
if (r) {
DMERR_LIMIT("%s: dm_pool_commit_metadata failed: error = %d",
dm_device_name(pool->pool_md), r);
set_pool_mode(pool, PM_READ_ONLY);
}
return r;
}
@ -945,7 +936,9 @@ static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
* Try to commit to see if that will free up some
* more space.
*/
(void) commit_or_fallback(pool);
r = commit(pool);
if (r)
return r;
r = dm_pool_get_free_block_count(pool->pmd, &free_blocks);
if (r)
@ -1359,7 +1352,7 @@ static void process_deferred_bios(struct pool *pool)
if (bio_list_empty(&bios) && !need_commit_due_to_time(pool))
return;
if (commit_or_fallback(pool)) {
if (commit(pool)) {
while ((bio = bio_list_pop(&bios)))
bio_io_error(bio);
return;
@ -2276,7 +2269,7 @@ static int pool_preresume(struct dm_target *ti)
return r;
if (need_commit1 || need_commit2)
(void) commit_or_fallback(pool);
(void) commit(pool);
return 0;
}
@ -2303,7 +2296,7 @@ static void pool_postsuspend(struct dm_target *ti)
cancel_delayed_work(&pool->waker);
flush_workqueue(pool->wq);
(void) commit_or_fallback(pool);
(void) commit(pool);
}
static int check_arg_count(unsigned argc, unsigned args_required)
@ -2437,7 +2430,7 @@ static int process_reserve_metadata_snap_mesg(unsigned argc, char **argv, struct
if (r)
return r;
(void) commit_or_fallback(pool);
(void) commit(pool);
r = dm_pool_reserve_metadata_snap(pool->pmd);
if (r)
@ -2499,7 +2492,7 @@ static int pool_message(struct dm_target *ti, unsigned argc, char **argv)
DMWARN("Unrecognised thin pool target message received: %s", argv[0]);
if (!r)
(void) commit_or_fallback(pool);
(void) commit(pool);
return r;
}
@ -2554,7 +2547,7 @@ static void pool_status(struct dm_target *ti, status_type_t type,
/* Commit to ensure statistics aren't out-of-date */
if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti))
(void) commit_or_fallback(pool);
(void) commit(pool);
r = dm_pool_get_metadata_transaction_id(pool->pmd, &transaction_id);
if (r) {