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block: Add submit_bio_wait(), remove from md

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Random cleanup - this code was duplicated and it's not really specific
to md.

Also added the ability to return the actual error code.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: NeilBrown <neilb@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Kent Overstreet 2012-09-10 14:41:12 -07:00
parent 2f477877f8
commit 9e882242c6
4 changed files with 37 additions and 38 deletions
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19
drivers/md/raid1.c
View File

@ -2059,25 +2059,6 @@ static void fix_read_error(struct r1conf *conf, int read_disk,
}
}
static void bi_complete(struct bio *bio, int error)
{
complete((struct completion *)bio->bi_private);
}
static int submit_bio_wait(int rw, struct bio *bio)
{
struct completion event;
rw |= REQ_SYNC;
init_completion(&event);
bio->bi_private = &event;
bio->bi_end_io = bi_complete;
submit_bio(rw, bio);
wait_for_completion(&event);
return test_bit(BIO_UPTODATE, &bio->bi_flags);
}
static int narrow_write_error(struct r1bio *r1_bio, int i)
{
struct mddev *mddev = r1_bio->mddev;

19
drivers/md/raid10.c
View File

@ -2529,25 +2529,6 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
}
}
static void bi_complete(struct bio *bio, int error)
{
complete((struct completion *)bio->bi_private);
}
static int submit_bio_wait(int rw, struct bio *bio)
{
struct completion event;
rw |= REQ_SYNC;
init_completion(&event);
bio->bi_private = &event;
bio->bi_end_io = bi_complete;
submit_bio(rw, bio);
wait_for_completion(&event);
return test_bit(BIO_UPTODATE, &bio->bi_flags);
}
static int narrow_write_error(struct r10bio *r10_bio, int i)
{
struct bio *bio = r10_bio->master_bio;

36
fs/bio.c
View File

@ -752,6 +752,42 @@ int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
}
EXPORT_SYMBOL(bio_add_page);
struct submit_bio_ret {
struct completion event;
int error;
};
static void submit_bio_wait_endio(struct bio *bio, int error)
{
struct submit_bio_ret *ret = bio->bi_private;
ret->error = error;
complete(&ret->event);
}
/**
* submit_bio_wait - submit a bio, and wait until it completes
* @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
* @bio: The &struct bio which describes the I/O
*
* Simple wrapper around submit_bio(). Returns 0 on success, or the error from
* bio_endio() on failure.
*/
int submit_bio_wait(int rw, struct bio *bio)
{
struct submit_bio_ret ret;
rw |= REQ_SYNC;
init_completion(&ret.event);
bio->bi_private = &ret;
bio->bi_end_io = submit_bio_wait_endio;
submit_bio(rw, bio);
wait_for_completion(&ret.event);
return ret.error;
}
EXPORT_SYMBOL(submit_bio_wait);
/**
* bio_advance - increment/complete a bio by some number of bytes
* @bio: bio to advance

1
include/linux/bio.h
View File

@ -249,6 +249,7 @@ extern void bio_endio(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
extern int submit_bio_wait(int rw, struct bio *bio);
extern void bio_advance(struct bio *, unsigned);
extern void bio_init(struct bio *);