diff options
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/rbd.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 842caf4aab4..c7bf9613ad4 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -235,6 +235,7 @@ struct rbd_device { /* sysfs related */ struct device dev; + unsigned long open_count; }; static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ @@ -309,8 +310,11 @@ static int rbd_open(struct block_device *bdev, fmode_t mode) if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) return -EROFS; + mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); rbd_get_dev(rbd_dev); set_device_ro(bdev, rbd_dev->mapping.read_only); + rbd_dev->open_count++; + mutex_unlock(&ctl_mutex); return 0; } @@ -319,7 +323,11 @@ static int rbd_release(struct gendisk *disk, fmode_t mode) { struct rbd_device *rbd_dev = disk->private_data; + mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + rbd_assert(rbd_dev->open_count > 0); + rbd_dev->open_count--; rbd_put_dev(rbd_dev); + mutex_unlock(&ctl_mutex); return 0; } @@ -3745,6 +3753,11 @@ static ssize_t rbd_remove(struct bus_type *bus, goto done; } + if (rbd_dev->open_count) { + ret = -EBUSY; + goto done; + } + rbd_remove_all_snaps(rbd_dev); rbd_bus_del_dev(rbd_dev); |