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block: remove BLKDEV_IFL_WAIT

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All the blkdev_issue_* helpers can only sanely be used for synchronous
caller.  To issue cache flushes or barriers asynchronously the caller needs
to set up a bio by itself with a completion callback to move the asynchronous
state machine ahead.  So drop the BLKDEV_IFL_WAIT flag that is always
specified when calling blkdev_issue_* and also remove the now unused flags
argument to blkdev_issue_flush and blkdev_issue_zeroout.  For
blkdev_issue_discard we need to keep it for the secure discard flag, which
gains a more descriptive name and loses the bitops vs flag confusion.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-09-16 20:51:46 +02:00 • committed by Jens Axboe
commit dd3932eddf
19 changed files with 47 additions and 71 deletions
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21
block/blk-lib.c
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@ -61,7 +61,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
max_discard_sectors &= ~(disc_sects - 1);
}
if (flags & BLKDEV_IFL_SECURE) {
if (flags & BLKDEV_DISCARD_SECURE) {
if (!blk_queue_secdiscard(q))
return -EOPNOTSUPP;
type |= REQ_SECURE;
@ -77,8 +77,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
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;
bio->bi_private = &wait;
if (nr_sects > max_discard_sectors) {
bio->bi_size = max_discard_sectors << 9;
@ -92,8 +91,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
bio_get(bio);
submit_bio(type, bio);
if (flags & BLKDEV_IFL_WAIT)
wait_for_completion(&wait);
wait_for_completion(&wait);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
ret = -EOPNOTSUPP;
@ -139,7 +137,6 @@ static void bio_batch_end_io(struct bio *bio, int err)
* @sector: start sector
* @nr_sects: number of sectors to write
* @gfp_mask: memory allocation flags (for bio_alloc)
* @flags: BLKDEV_IFL_* flags to control behaviour
*
* Description:
* Generate and issue number of bios with zerofiled pages.
@ -148,7 +145,7 @@ static void bio_batch_end_io(struct bio *bio, int err)
*/
int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
sector_t nr_sects, gfp_t gfp_mask)
{
int ret;
struct bio *bio;
@ -174,8 +171,7 @@ submit:
bio->bi_sector = sector;
bio->bi_bdev = bdev;
bio->bi_end_io = bio_batch_end_io;
if (flags & BLKDEV_IFL_WAIT)
bio->bi_private = &bb;
bio->bi_private = &bb;
while (nr_sects != 0) {
sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
@ -193,10 +189,9 @@ submit:
submit_bio(WRITE, bio);
}
if (flags & BLKDEV_IFL_WAIT)
/* Wait for bios in-flight */
while ( issued != atomic_read(&bb.done))
wait_for_completion(&wait);
/* Wait for bios in-flight */
while (issued != atomic_read(&bb.done))
wait_for_completion(&wait);
if (!test_bit(BIO_UPTODATE, &bb.flags))
/* One of bios in the batch was completed with error.*/