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dm: tidy bio_io_error usage

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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: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2007-10-19 22:38:53 +01:00 committed by Alasdair G Kergon
parent def5b5b26e
commit 9e4e5f87eb
1 changed files with 18 additions and 19 deletions
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37
drivers/md/dm.c
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@ -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);
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;
}
}