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author | Dmitry Monakhov <dmonakhov@openvz.org> | 2010-04-28 17:55:08 +0400 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2010-04-28 19:47:36 +0200 |
commit | f31e7e4022841c43c53b847b86b1bf97a08b2c94 (patch) | |
tree | 738821236a4e84f790d597bb2cc04bd812668b6a /block/blk-barrier.c | |
parent | f17e232e9237c231daf9f0f4b177c61218bcb2e4 (diff) | |
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blkdev: move blkdev_issue helper functions to separate file
Move blkdev_issue_discard from blk-barrier.c because it is
not barrier related.
Later the file will be populated by other helpers.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-barrier.c')
-rw-r--r-- | block/blk-barrier.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/block/blk-barrier.c b/block/blk-barrier.c index f11eec9..0d710c9 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -347,107 +347,3 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, return ret; } EXPORT_SYMBOL(blkdev_issue_flush); - -static void blkdev_discard_end_io(struct bio *bio, int err) -{ - if (err) { - if (err == -EOPNOTSUPP) - set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); - clear_bit(BIO_UPTODATE, &bio->bi_flags); - } - - if (bio->bi_private) - complete(bio->bi_private); - __free_page(bio_page(bio)); - - bio_put(bio); -} - -/** - * blkdev_issue_discard - queue a discard - * @bdev: blockdev to issue discard for - * @sector: start sector - * @nr_sects: number of sectors to discard - * @gfp_mask: memory allocation flags (for bio_alloc) - * @flags: BLKDEV_IFL_* flags to control behaviour - * - * Description: - * Issue a discard request for the sectors in question. - */ -int blkdev_issue_discard(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) -{ - DECLARE_COMPLETION_ONSTACK(wait); - struct request_queue *q = bdev_get_queue(bdev); - int type = flags & BLKDEV_IFL_BARRIER ? - DISCARD_BARRIER : DISCARD_NOBARRIER; - struct bio *bio; - struct page *page; - int ret = 0; - - if (!q) - return -ENXIO; - - if (!blk_queue_discard(q)) - return -EOPNOTSUPP; - - while (nr_sects && !ret) { - unsigned int sector_size = q->limits.logical_block_size; - unsigned int max_discard_sectors = - min(q->limits.max_discard_sectors, UINT_MAX >> 9); - - bio = bio_alloc(gfp_mask, 1); - if (!bio) - goto out; - bio->bi_sector = sector; - bio->bi_end_io = blkdev_discard_end_io; - bio->bi_bdev = bdev; - if (flags & BLKDEV_IFL_WAIT) - bio->bi_private = &wait; - - /* - * Add a zeroed one-sector payload as that's what - * our current implementations need. If we'll ever need - * more the interface will need revisiting. - */ - page = alloc_page(gfp_mask | __GFP_ZERO); - if (!page) - goto out_free_bio; - if (bio_add_pc_page(q, bio, page, sector_size, 0) < sector_size) - goto out_free_page; - - /* - * And override the bio size - the way discard works we - * touch many more blocks on disk than the actual payload - * length. - */ - if (nr_sects > max_discard_sectors) { - bio->bi_size = max_discard_sectors << 9; - nr_sects -= max_discard_sectors; - sector += max_discard_sectors; - } else { - bio->bi_size = nr_sects << 9; - nr_sects = 0; - } - - bio_get(bio); - submit_bio(type, bio); - - if (flags & BLKDEV_IFL_WAIT) - wait_for_completion(&wait); - - if (bio_flagged(bio, BIO_EOPNOTSUPP)) - ret = -EOPNOTSUPP; - else if (!bio_flagged(bio, BIO_UPTODATE)) - ret = -EIO; - bio_put(bio); - } - return ret; -out_free_page: - __free_page(page); -out_free_bio: - bio_put(bio); -out: - return -ENOMEM; -} -EXPORT_SYMBOL(blkdev_issue_discard); |