bcache: fix ioctl in flash device

When doing ioctl in flash device, it will call ioctl_dev() in super.c,
then we should not to get cached device since flash only device has
no backend device. This patch just move the jugement dc->io_disable
to cached_dev_ioctl() to make ioctl in flash device correctly.

Fixes: 0f0709e6bfc3c ("bcache: stop bcache device when backing device is offline")
Signed-off-by: Tang Junhui <tang.junhui.linux@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 3 insertions, 4 deletions

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index ee15fb039fd0..3bf35914bb57 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1218,6 +1218,9 @@ static int cached_dev_ioctl(struct bcache_device *d, fmode_t mode,
 {
         struct cached_dev *dc = container_of(d, struct cached_dev, disk);
 
+        if (dc->io_disable)
+                return -EIO;
+
         return __blkdev_driver_ioctl(dc->bdev, mode, cmd, arg);
 }
 
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 5fd1466b34e4..9de6695195bf 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -648,10 +648,6 @@ static int ioctl_dev(struct block_device *b, fmode_t mode,
                      unsigned int cmd, unsigned long arg)
 {
         struct bcache_device *d = b->bd_disk->private_data;
-        struct cached_dev *dc = container_of(d, struct cached_dev, disk);
-
-        if (dc->io_disable)
-                return -EIO;
 
         return d->ioctl(d, mode, cmd, arg);
 }