diff options
| author | Jens Axboe <axboe@fb.com> | 2015-10-27 14:09:51 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-11-07 10:40:47 -0700 |
| commit | 15c4f638f3d41bae52105ca4c0c8760afbcbeaab (patch) | |
| tree | 4de68193b0c318d6b1b00ec2a06ae40c8ec8069e | |
| parent | a0fa9647a54e81883abd57c5c865d1747f68a577 (diff) | |
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>
| -rw-r--r-- | fs/direct-io.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 3ae0e0427191..7025029c666f 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -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; |