rbd: get rid of rbd_mapping::read_only

It is redundant -- rw/ro state is stored in hd_struct and managed by
the block layer.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index fb7cb38a6d83bf409602285bcadb7c0ce135905f..53b1ced21a139ac47f13e096e32299c23b0f0794 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -348,7 +348,6 @@ struct rbd_client_id {
 struct rbd_mapping {
        u64                     size;
        u64                     features;
-       bool                    read_only;
 };
 
 /*
@@ -608,9 +607,6 @@ static int rbd_open(struct block_device *bdev, fmode_t mode)
        struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
        bool removing = false;
 
-       if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only)
-               return -EROFS;
-
        spin_lock_irq(&rbd_dev->lock);
        if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags))
                removing = true;
@@ -4028,15 +4024,8 @@ static void rbd_queue_workfn(struct work_struct *work)
                goto err_rq;
        }
 
-       /* Only reads are allowed to a read-only device */
-
-       if (op_type != OBJ_OP_READ) {
-               if (rbd_dev->mapping.read_only) {
-                       result = -EROFS;
-                       goto err_rq;
-               }
-               rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP);
-       }
+       rbd_assert(op_type == OBJ_OP_READ ||
+                  rbd_dev->spec->snap_id == CEPH_NOSNAP);
 
        /*
         * Quit early if the mapped snapshot no longer exists.  It's
@@ -5972,7 +5961,7 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
                goto err_out_disk;
 
        set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
-       set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);
+       set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only);
 
        ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id);
        if (ret)
@@ -6123,7 +6112,6 @@ static ssize_t do_rbd_add(struct bus_type *bus,
        struct rbd_options *rbd_opts = NULL;
        struct rbd_spec *spec = NULL;
        struct rbd_client *rbdc;
-       bool read_only;
        int rc;
 
        if (!try_module_get(THIS_MODULE))
@@ -6172,11 +6160,8 @@ static ssize_t do_rbd_add(struct bus_type *bus,
        }
 
        /* If we are mapping a snapshot it must be marked read-only */
-
-       read_only = rbd_dev->opts->read_only;
        if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
-               read_only = true;
-       rbd_dev->mapping.read_only = read_only;
+               rbd_dev->opts->read_only = true;
 
        rc = rbd_dev_device_setup(rbd_dev);
        if (rc)