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Commit 9e4e5f87 authored by Milan Broz's avatar Milan Broz Committed by Alasdair G Kergon
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dm: tidy bio_io_error usage 



Use bio_io_error() in only two places and tidy the code,
preparing for later patches.

There is no functional change in this patch.

Signed-off-by: default avatarMilan Broz <mbroz@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent def5b5b2

drivers/md/dm.c

+18 −19
Original line number Diff line number Diff line
@@ -751,15 +751,13 @@ static void __clone_and_map(struct clone_info *ci) 
/*

 * Split the bio into several clones.

 */

static void __split_bio(struct mapped_device *md, struct bio *bio)

static int __split_bio(struct mapped_device *md, struct bio *bio)

{

	struct clone_info ci;



	ci.map = dm_get_table(md);

	if (!ci.map) {

		bio_io_error(bio);

		return;

	}

	if (unlikely(!ci.map))

		return -EIO;



	ci.md = md;

	ci.bio = bio;
@@ -779,6 +777,8 @@ static void __split_bio(struct mapped_device *md, struct bio *bio) 
	/* drop the extra reference count */

	dec_pending(ci.io, 0);

	dm_table_put(ci.map);



	return 0;

}

/*-----------------------------------------------------------------

 * CRUD END
@@ -790,7 +790,7 @@ static void __split_bio(struct mapped_device *md, struct bio *bio) 
 */

static int dm_request(struct request_queue *q, struct bio *bio)

{

	int r;

	int r = -EIO;

	int rw = bio_data_dir(bio);

	struct mapped_device *md = q->queuedata;
@@ -815,18 +815,11 @@ static int dm_request(struct request_queue *q, struct bio *bio) 
	while (test_bit(DMF_BLOCK_IO, &md->flags)) {

		up_read(&md->io_lock);



		if (bio_rw(bio) == READA) {

			bio_io_error(bio);

			return 0;

		}



		if (bio_rw(bio) != READA)

			r = queue_io(md, bio);

		if (r < 0) {

			bio_io_error(bio);

			return 0;



		} else if (r == 0)

			return 0;	/* deferred successfully */

		if (r <= 0)

			goto out_req;



		/*

		 * We're in a while loop, because someone could suspend
@@ -835,8 +828,13 @@ static int dm_request(struct request_queue *q, struct bio *bio) 
		down_read(&md->io_lock);

	}



	__split_bio(md, bio);

	r = __split_bio(md, bio);

	up_read(&md->io_lock);



out_req:

	if (r < 0)

		bio_io_error(bio);



	return 0;

}
@@ -1235,7 +1233,8 @@ static void __flush_deferred_io(struct mapped_device *md, struct bio *c) 
	while (c) {

		n = c->bi_next;

		c->bi_next = NULL;

		__split_bio(md, c);

		if (__split_bio(md, c))

			bio_io_error(c);

		c = n;

	}

}