From mboxrd@z Thu Jan 1 00:00:00 1970 From: Li Dongyang Subject: [PATCH]btrfs: don't remove device on a raid0 array when device number is 2 Date: Sat, 5 Dec 2009 22:13:52 +0800 Message-ID: <20091205141352.GA8277@Archlinux> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: chris.mason@oracle.com To: linux-btrfs@vger.kernel.org Return-path: List-ID: we should not make a raid0 array go below 2 devices. Signed-off-by: Li Dongyang --- fs/btrfs/volumes.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 20cbd2e..801b8d0 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1150,6 +1150,14 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path) goto out; } + if ((all_avail & BTRFS_BLOCK_GROUP_RAID0) && + root->fs_info->fs_devices->rw_devices <= 2) { + printk(KERN_ERR "btrfs: unable to go below two " + "devices on raid0\n"); + ret = -EINVAL; + goto out; + } + if (strcmp(device_path, "missing") == 0) { struct list_head *devices; struct btrfs_device *tmp; -- 1.6.5.4