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Subject[PATCH 5/5] directio: add block polling support
Date
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>
---
fs/direct-io.c | 14 ++++++++++----
1 file 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;
--
2.4.1.168.g1ea28e1


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