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blkdev: allow async blkdev_issue_flush requests

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In some places caller don't want to wait a request to complete.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Dmitry Monakhov 2010-04-28 17:55:07 +04:00 committed by Jens Axboe
parent fbd9b09a17
commit f17e232e92
1 changed files with 19 additions and 14 deletions
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33
block/blk-barrier.c
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@ -286,8 +286,9 @@ static void bio_end_empty_barrier(struct bio *bio, int err)
set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
clear_bit(BIO_UPTODATE, &bio->bi_flags); clear_bit(BIO_UPTODATE, &bio->bi_flags);
} }
if (bio->bi_private)
complete(bio->bi_private); complete(bio->bi_private);
bio_put(bio);
} }
/** /**
@ -300,7 +301,8 @@ static void bio_end_empty_barrier(struct bio *bio, int err)
* Description: * Description:
* Issue a flush for the block device in question. Caller can supply * Issue a flush for the block device in question. Caller can supply
* room for storing the error offset in case of a flush error, if they * room for storing the error offset in case of a flush error, if they
* wish to. * wish to. If WAIT flag is not passed then caller may check only what
* request was pushed in some internal queue for later handling.
*/ */
int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
sector_t *error_sector, unsigned long flags) sector_t *error_sector, unsigned long flags)
@ -319,19 +321,22 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
bio = bio_alloc(gfp_mask, 0); bio = bio_alloc(gfp_mask, 0);
bio->bi_end_io = bio_end_empty_barrier; bio->bi_end_io = bio_end_empty_barrier;
bio->bi_private = &wait;
bio->bi_bdev = bdev; bio->bi_bdev = bdev;
if (test_bit(BLKDEV_WAIT, &flags))
bio->bi_private = &wait;
bio_get(bio);
submit_bio(WRITE_BARRIER, bio); submit_bio(WRITE_BARRIER, bio);
if (test_bit(BLKDEV_WAIT, &flags)) {
wait_for_completion(&wait); wait_for_completion(&wait);
/*
/* * The driver must store the error location in ->bi_sector, if
* The driver must store the error location in ->bi_sector, if * it supports it. For non-stacked drivers, this should be
* it supports it. For non-stacked drivers, this should be copied * copied from blk_rq_pos(rq).
* from blk_rq_pos(rq). */
*/ if (error_sector)
if (error_sector) *error_sector = bio->bi_sector;
*error_sector = bio->bi_sector; }
if (bio_flagged(bio, BIO_EOPNOTSUPP)) if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP; ret = -EOPNOTSUPP;