nbd: show read-only state in sysfs

Pass the read-only flag to set_device_ro, so that it will be visible to
the block layer and in sysfs.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul Clements <Paul.Clements@steeleye.com>
Cc: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 869861a..52003d7 100644 (file)
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -703,6 +703,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
 
                mutex_unlock(&nbd->tx_lock);
 
+               if (nbd->flags & NBD_FLAG_READ_ONLY)
+                       set_device_ro(bdev, true);
                if (nbd->flags & NBD_FLAG_SEND_TRIM)
                        queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
                                nbd->disk->queue);
@@ -730,6 +732,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
                dev_warn(disk_to_dev(nbd->disk), "queue cleared\n");
                kill_bdev(bdev);
                queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue);
+               set_device_ro(bdev, false);
                if (file)
                        fput(file);
                nbd->flags = 0;