[PATCH 13/27] block: add a bdev_fua helper

[Christoph Hellwig <hch@xxxxxx>]

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@xxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
 drivers/block/rnbd/rnbd-srv.c       | 3 +--
 drivers/target/target_core_iblock.c | 3 +--
 fs/iomap/direct-io.c                | 3 +--
 include/linux/blkdev.h              | 6 +++++-
 4 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index f8cc3c5fecb4b..beaef43a67b9d 100644
--- 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 03013e85ffc03..c4a903b8a47fc 100644
--- 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 b08f5dc31780d..62da020d02a11 100644
--- 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 807a49aa5a27a..075b16d4560e7 100644
--- 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);
-- 
2.30.2