Li Dongyang
2009-Dec-05 14:13 UTC
[PATCH]btrfs: don''t remove device on a raid0 array when device number is 2
we should not make a raid0 array go below 2 devices.
Signed-off-by: Li Dongyang <Jerry87905@gmail.com>
---
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
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