block: add a bdev_fua helper

Add a helper to check the FUA flag based on the block_device instead of
having to poke into the block layer internal request_queue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index f8cc3c5..beaef43 100644 (file)
--- a/drivers/block/rnbd/rnbd-srv.c
+++ b/drivers/block/rnbd/rnbd-srv.c
@@ -533,7 +533,6 @@ static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp,
                                        struct rnbd_srv_sess_dev *sess_dev)
 {
        struct rnbd_dev *rnbd_dev = sess_dev->rnbd_dev;
-       struct request_queue *q = bdev_get_queue(rnbd_dev->bdev);
 
        rsp->hdr.type = cpu_to_le16(RNBD_MSG_OPEN_RSP);
        rsp->device_id =
@@ -560,7 +559,7 @@ static void rnbd_srv_fill_msg_open_rsp(struct rnbd_msg_open_rsp *rsp,
        rsp->cache_policy = 0;
        if (bdev_write_cache(rnbd_dev->bdev))
                rsp->cache_policy |= RNBD_WRITEBACK;
-       if (blk_queue_fua(q))
+       if (bdev_fua(rnbd_dev->bdev))
                rsp->cache_policy |= RNBD_FUA;
 }
 

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 03013e8..c4a903b 100644 (file)
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -727,14 +727,13 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 
        if (data_direction == DMA_TO_DEVICE) {
                struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
-               struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
                /*
                 * Force writethrough using REQ_FUA if a volatile write cache
                 * is not enabled, or if initiator set the Force Unit Access bit.
                 */
                opf = REQ_OP_WRITE;
                miter_dir = SG_MITER_TO_SG;
-               if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) {
+               if (bdev_fua(ib_dev->ibd_bd)) {
                        if (cmd->se_cmd_flags & SCF_FUA)
                                opf |= REQ_FUA;
                        else if (!bdev_write_cache(ib_dev->ibd_bd))

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index b08f5dc..62da020 100644 (file)
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -265,8 +265,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
                 * cache flushes on IO completion.
                 */
                if (!(iomap->flags & (IOMAP_F_SHARED|IOMAP_F_DIRTY)) &&
-                   (dio->flags & IOMAP_DIO_WRITE_FUA) &&
-                   blk_queue_fua(bdev_get_queue(iomap->bdev)))
+                   (dio->flags & IOMAP_DIO_WRITE_FUA) && bdev_fua(iomap->bdev))
                        use_fua = true;
        }
 

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 807a49a..075b16d 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -602,7 +602,6 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
                             REQ_FAILFAST_DRIVER))
 #define blk_queue_quiesced(q)  test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
 #define blk_queue_pm_only(q)   atomic_read(&(q)->pm_only)
-#define blk_queue_fua(q)       test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
 #define blk_queue_registered(q)        test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
 #define blk_queue_nowait(q)    test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags)
 
@@ -1336,6 +1335,11 @@ static inline bool bdev_write_cache(struct block_device *bdev)
        return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
 }
 
+static inline bool bdev_fua(struct block_device *bdev)
+{
+       return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
+}
+
 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
 {
        struct request_queue *q = bdev_get_queue(bdev);