blkdev: allow async blkdev_issue_flush requests
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>
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@ -286,8 +286,9 @@ static void bio_end_empty_barrier(struct bio *bio, int err)
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set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
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clear_bit(BIO_UPTODATE, &bio->bi_flags);
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}
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complete(bio->bi_private);
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if (bio->bi_private)
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complete(bio->bi_private);
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bio_put(bio);
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}
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/**
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@ -300,7 +301,8 @@ static void bio_end_empty_barrier(struct bio *bio, int err)
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* Description:
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* Issue a flush for the block device in question. Caller can supply
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* room for storing the error offset in case of a flush error, if they
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* wish to.
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* wish to. If WAIT flag is not passed then caller may check only what
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* request was pushed in some internal queue for later handling.
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*/
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int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
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sector_t *error_sector, unsigned long flags)
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@ -319,19 +321,22 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
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bio = bio_alloc(gfp_mask, 0);
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bio->bi_end_io = bio_end_empty_barrier;
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bio->bi_private = &wait;
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bio->bi_bdev = bdev;
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if (test_bit(BLKDEV_WAIT, &flags))
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bio->bi_private = &wait;
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bio_get(bio);
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submit_bio(WRITE_BARRIER, bio);
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wait_for_completion(&wait);
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/*
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* The driver must store the error location in ->bi_sector, if
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* it supports it. For non-stacked drivers, this should be copied
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* from blk_rq_pos(rq).
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*/
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if (error_sector)
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*error_sector = bio->bi_sector;
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if (test_bit(BLKDEV_WAIT, &flags)) {
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wait_for_completion(&wait);
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/*
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* The driver must store the error location in ->bi_sector, if
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* it supports it. For non-stacked drivers, this should be
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* copied from blk_rq_pos(rq).
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*/
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if (error_sector)
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*error_sector = bio->bi_sector;
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}
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if (bio_flagged(bio, BIO_EOPNOTSUPP))
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ret = -EOPNOTSUPP;
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