[PATCH 12/27] block: add a bdev_write_cache helper

[Christoph Hellwig <hch@xxxxxx>]

Add a helper to check the write cache 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>
Acked-by: David Sterba <dsterba@xxxxxxxx> [btrfs]
---
 drivers/block/rnbd/rnbd-srv.c       | 2 +-
 drivers/block/xen-blkback/xenbus.c  | 2 +-
 drivers/target/target_core_iblock.c | 8 ++------
 fs/btrfs/disk-io.c                  | 3 +--
 include/linux/blkdev.h              | 5 +++++
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index f04df6294650b..f8cc3c5fecb4b 100644
--- a/drivers/block/rnbd/rnbd-srv.c
+++ b/drivers/block/rnbd/rnbd-srv.c
@@ -558,7 +558,7 @@ static void rnbd_srv_fill_msg_open_rsp(struct 
rnbd_msg_open_rsp *rsp,
        rsp->secure_discard =
                cpu_to_le16(rnbd_dev_get_secure_discard(rnbd_dev));
        rsp->cache_policy = 0;
-       if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+       if (bdev_write_cache(rnbd_dev->bdev))
                rsp->cache_policy |= RNBD_WRITEBACK;
        if (blk_queue_fua(q))
                rsp->cache_policy |= RNBD_FUA;
diff --git a/drivers/block/xen-blkback/xenbus.c 
b/drivers/block/xen-blkback/xenbus.c
index f09040435e2e5..8b691fe50475f 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -517,7 +517,7 @@ static int xen_vbd_create(struct xen_blkif *blkif, 
blkif_vdev_t handle,
                vbd->type |= VDISK_REMOVABLE;
 
        q = bdev_get_queue(bdev);
-       if (q && test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+       if (bdev_write_cache(bdev))
                vbd->flush_support = true;
 
        if (q && blk_queue_secure_erase(q))
diff --git a/drivers/target/target_core_iblock.c 
b/drivers/target/target_core_iblock.c
index b41ee5c3b5b82..03013e85ffc03 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -737,7 +737,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist 
*sgl, u32 sgl_nents,
                if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) {
                        if (cmd->se_cmd_flags & SCF_FUA)
                                opf |= REQ_FUA;
-                       else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+                       else if (!bdev_write_cache(ib_dev->ibd_bd))
                                opf |= REQ_FUA;
                }
        } else {
@@ -886,11 +886,7 @@ iblock_parse_cdb(struct se_cmd *cmd)
 
 static bool iblock_get_write_cache(struct se_device *dev)
 {
-       struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
-       struct block_device *bd = ib_dev->ibd_bd;
-       struct request_queue *q = bdev_get_queue(bd);
-
-       return test_bit(QUEUE_FLAG_WC, &q->queue_flags);
+       return bdev_write_cache(IBLOCK_DEV(dev)->ibd_bd);
 }
 
 static const struct target_backend_ops iblock_ops = {
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b30309f187cf0..d80adee32128d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4247,8 +4247,7 @@ static void write_dev_flush(struct btrfs_device *device)
         * of simplicity, since this is a debug tool and not meant for use in
         * non-debug builds.
         */
-       struct request_queue *q = bdev_get_queue(device->bdev);
-       if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+       if (bdev_write_cache(device->bdev))
                return;
 #endif
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3a9578e14a6b0..807a49aa5a27a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1331,6 +1331,11 @@ static inline bool bdev_nonrot(struct block_device *bdev)
        return blk_queue_nonrot(bdev_get_queue(bdev));
 }
 
+static inline bool bdev_write_cache(struct block_device *bdev)
+{
+       return test_bit(QUEUE_FLAG_WC, &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