dm: fix comment in __dm_suspend() (0cede372) · Commits · 戴 / test

drivers/md/dm.c

+4 −5

Original line number	Diff line number	Diff line
		@@ -2518,13 +2518,12 @@ static int __dm_suspend(struct mapped_device md, struct dm_table map,
		/*
		* Here we must make sure that no processes are submitting requests
		* to target drivers i.e. no one may be executing
		* __split_and_process_bio. This is called from dm_request and
		* dm_wq_work.
		* __split_and_process_bio from dm_submit_bio.
		*
		* To get all processes out of __split_and_process_bio in dm_request,
		* To get all processes out of __split_and_process_bio in dm_submit_bio,
		* we take the write lock. To prevent any process from reentering
		* __split_and_process_bio from dm_request and quiesce the thread
		* (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call
		* __split_and_process_bio from dm_submit_bio and quiesce the thread
		* (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call
		* flush_workqueue(md->wq).
		*/
		set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);