block: add a bdev_stable_writes helper

Add a helper to check the stable writes 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/20220415045258.199825-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 5e38d0d..d46839f 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1950,9 +1950,7 @@ static int device_requires_stable_pages(struct dm_target *ti,
                                        struct dm_dev *dev, sector_t start,
                                        sector_t len, void *data)
 {
-       struct request_queue *q = bdev_get_queue(dev->bdev);
-
-       return blk_queue_stable_writes(q);
+       return bdev_stable_writes(dev->bdev);
 }
 
 int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,

diff --git a/fs/super.c b/fs/super.c
index f1d4a19..60f57c7 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -1204,7 +1204,7 @@ static int set_bdev_super(struct super_block *s, void *data)
        s->s_dev = s->s_bdev->bd_dev;
        s->s_bdi = bdi_get(s->s_bdev->bd_disk->bdi);
 
-       if (blk_queue_stable_writes(s->s_bdev->bd_disk->queue))
+       if (bdev_stable_writes(s->s_bdev))
                s->s_iflags |= SB_I_STABLE_WRITES;
        return 0;
 }

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 075b16d..a433798 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1330,6 +1330,12 @@ static inline bool bdev_nonrot(struct block_device *bdev)
        return blk_queue_nonrot(bdev_get_queue(bdev));
 }
 
+static inline bool bdev_stable_writes(struct block_device *bdev)
+{
+       return test_bit(QUEUE_FLAG_STABLE_WRITES,
+                       &bdev_get_queue(bdev)->queue_flags);
+}
+
 static inline bool bdev_write_cache(struct block_device *bdev)
 {
        return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);

diff --git a/mm/swapfile.c b/mm/swapfile.c
index d5ab7ec..4069f17 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3065,7 +3065,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
                goto bad_swap_unlock_inode;
        }
 
-       if (p->bdev && blk_queue_stable_writes(p->bdev->bd_disk->queue))
+       if (p->bdev && bdev_stable_writes(p->bdev))
                p->flags |= SWP_STABLE_WRITES;
 
        if (p->bdev && p->bdev->bd_disk->fops->rw_page)