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directio: add block polling support 

This adds support for sync O_DIRECT read/write poll support.

Signed-off-by: Jens Axboe <axboe@fb.com>
[hch: split from a larger patch, minor updates]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Jens Axboe 2015-10-27 14:09:51 +09:00
parent a0fa9647a5
commit 15c4f638f3
1 changed files with 10 additions and 4 deletions
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14
fs/direct-io.c
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@ -109,6 +109,8 @@ struct dio_submit {
struct dio {
int flags; /* doesn't change */
int rw;
blk_qc_t bio_cookie;
struct block_device *bio_bdev;
struct inode *inode;
loff_t i_size; /* i_size when submitted */
dio_iodone_t *end_io; /* IO completion function */
@ -397,11 +399,14 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
if (dio->is_async && dio->rw == READ && dio->should_dirty)
bio_set_pages_dirty(bio);
if (sdio->submit_io)
if (sdio->submit_io) {
sdio->submit_io(dio->rw, bio, dio->inode,
sdio->logical_offset_in_bio);
else
submit_bio(dio->rw, bio);
dio->bio_cookie = BLK_QC_T_NONE;
} else {
dio->bio_cookie = submit_bio(dio->rw, bio);
dio->bio_bdev = bio->bi_bdev;
}
sdio->bio = NULL;
sdio->boundary = 0;
@ -440,7 +445,8 @@ static struct bio *dio_await_one(struct dio *dio)
__set_current_state(TASK_UNINTERRUPTIBLE);
dio->waiter = current;
spin_unlock_irqrestore(&dio->bio_lock, flags);
io_schedule();
if (!blk_poll(bdev_get_queue(dio->bio_bdev), dio->bio_cookie))
io_schedule();
/* wake up sets us TASK_RUNNING */
spin_lock_irqsave(&dio->bio_lock, flags);
dio->waiter = NULL;