diff options
author | Guangliang Zhao | 2013-09-24 11:25:36 +0800 |
---|---|---|
committer | Josh Durgin | 2014-06-10 18:09:24 -0700 |
commit | 131fd9f6fc89ad2cc993f80664d18ca49d6f8483 (patch) | |
tree | a5dd9b68bb868f62229f159fd64f3c4322b21edc /drivers | |
parent | 4e217b5dc87042b0fa52b11f491c4ded1863823a (diff) |
rbd: add ioctl for rbd
When running the following commands:
[root@ceph0 mnt]# blockdev --setro /dev/rbd1
[root@ceph0 mnt]# blockdev --getro /dev/rbd1
0
The block setro didn't take effect, it is because
the rbd doesn't support ioctl of block driver.
This resolves:
http://tracker.ceph.com/issues/6265
Signed-off-by: Guangliang Zhao <guangliang@unitedstack.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/block/rbd.c | 62 |
1 files changed, 60 insertions, 2 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 8295b3afa8e0..1c88fba98c8e 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -559,10 +559,69 @@ static void rbd_release(struct gendisk *disk, fmode_t mode) put_device(&rbd_dev->dev); } +static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) +{ + int val; + bool ro; + + if (get_user(val, (int __user *)(arg))) + return -EFAULT; + + ro = val ? true : false; + /* Snapshot doesn't allow to write*/ + if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) + return -EROFS; + + if (rbd_dev->mapping.read_only != ro) { + rbd_dev->mapping.read_only = ro; + set_disk_ro(rbd_dev->disk, ro ? 1 : 0); + } + + return 0; +} + +static int rbd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct rbd_device *rbd_dev = bdev->bd_disk->private_data; + int ret = 0; + + spin_lock_irq(&rbd_dev->lock); + /* prevent others open this device */ + if (rbd_dev->open_count > 1) { + ret = -EBUSY; + goto out; + } + + switch (cmd) { + case BLKROSET: + ret = rbd_ioctl_set_ro(rbd_dev, arg); + break; + default: + ret = -ENOTTY; + } + +out: + spin_unlock_irq(&rbd_dev->lock); + return ret; +} + +#ifdef CONFIG_COMPAT +static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + return rbd_ioctl(bdev, mode, cmd, arg); +} +#endif /* CONFIG_COMPAT */ + static const struct block_device_operations rbd_bd_ops = { .owner = THIS_MODULE, .open = rbd_open, .release = rbd_release, + .ioctl = rbd_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = rbd_compat_ioctl, +#endif }; /* @@ -3114,7 +3173,6 @@ static void rbd_request_fn(struct request_queue *q) __releases(q->queue_lock) __acquires(q->queue_lock) { struct rbd_device *rbd_dev = q->queuedata; - bool read_only = rbd_dev->mapping.read_only; struct request *rq; int result; @@ -3150,7 +3208,7 @@ static void rbd_request_fn(struct request_queue *q) if (write_request) { result = -EROFS; - if (read_only) + if (rbd_dev->mapping.read_only) goto end_request; rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); } |