diff options
Diffstat (limited to 'fs/xfs/xfs_bio_io.c')
| -rw-r--r-- | fs/xfs/xfs_bio_io.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bio_io.c b/fs/xfs/xfs_bio_io.c index 17f36db2f792..667e297f59b1 100644 --- a/fs/xfs/xfs_bio_io.c +++ b/fs/xfs/xfs_bio_io.c @@ -9,6 +9,41 @@ static inline unsigned int bio_max_vecs(unsigned int count) return bio_max_segs(howmany(count, PAGE_SIZE)); } +static void +xfs_flush_bdev_async_endio( + struct bio *bio) +{ + complete(bio->bi_private); +} + +/* + * Submit a request for an async cache flush to run. If the request queue does + * not require flush operations, just skip it altogether. If the caller needs + * to wait for the flush completion at a later point in time, they must supply a + * valid completion. This will be signalled when the flush completes. The + * caller never sees the bio that is issued here. + */ +void +xfs_flush_bdev_async( + struct bio *bio, + struct block_device *bdev, + struct completion *done) +{ + struct request_queue *q = bdev->bd_disk->queue; + + if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) { + complete(done); + return; + } + + bio_init(bio, NULL, 0); + bio_set_dev(bio, bdev); + bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC; + bio->bi_private = done; + bio->bi_end_io = xfs_flush_bdev_async_endio; + + submit_bio(bio); +} int xfs_rw_bdev( struct block_device *bdev, |