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Commit 492bb6de authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Hold a reference on bios during submit_bio, add some extra bio checks 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 3ce7e67a

fs/btrfs/volumes.c

+9 −1
Original line number Diff line number Diff line
@@ -180,7 +180,11 @@ int run_scheduled_bios(struct btrfs_device *device) 
		pending = pending->bi_next;

		cur->bi_next = NULL;

		atomic_dec(&device->dev_root->fs_info->nr_async_submits);



		BUG_ON(atomic_read(&cur->bi_cnt) == 0);

		bio_get(cur);

		submit_bio(cur->bi_rw, cur);

		bio_put(cur);

		num_run++;



		/*
@@ -188,10 +192,11 @@ int run_scheduled_bios(struct btrfs_device *device) 
		 * is now congested.  Back off and let other work structs

		 * run instead

		 */

		if (pending && num_run && bdi_write_congested(bdi)) {

		if (pending && bdi_write_congested(bdi)) {

			struct bio *old_head;



			spin_lock(&device->io_lock);



			old_head = device->pending_bios;

			device->pending_bios = pending;

			if (device->pending_bio_tail)
@@ -2125,7 +2130,9 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device, 


	/* don't bother with additional async steps for reads, right now */

	if (!(rw & (1 << BIO_RW))) {

		bio_get(bio);

		submit_bio(rw, bio);

		bio_put(bio);

		return 0;

	}
@@ -2136,6 +2143,7 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device, 
	 * on a queue for later

	 */

	atomic_inc(&root->fs_info->nr_async_submits);

	WARN_ON(bio->bi_next);

	bio->bi_next = NULL;

	bio->bi_rw |= rw;