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Commit 020cc3b5 authored by Joe Thornber's avatar Joe Thornber Committed by Mike Snitzer
Browse files

dm thin: always fallback the pool mode if commit fails 



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: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
parent 4a02b34e

drivers/md/dm-thin.c

+15 −22
Original line number Diff line number Diff line
@@ -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) {