Commit 5d68da3b authored by Miao Xie's avatar Miao Xie Committed by Chris Mason

Btrfs: don't write any data into a readonly device when scrub

We should not write data into a readonly device especially seed device when
doing scrub, skip those devices.
Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent ff61d17c
......@@ -2904,6 +2904,7 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
struct scrub_ctx *sctx;
int ret;
struct btrfs_device *dev;
struct rcu_string *name;
if (btrfs_fs_closing(fs_info))
return -EINVAL;
......@@ -2965,6 +2966,16 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
return -ENODEV;
}
if (!is_dev_replace && !readonly && !dev->writeable) {
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
rcu_read_lock();
name = rcu_dereference(dev->name);
btrfs_err(fs_info, "scrub: device %s is not writable",
name->str);
rcu_read_unlock();
return -EROFS;
}
mutex_lock(&fs_info->scrub_lock);
if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
mutex_unlock(&fs_info->scrub_lock);
......
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