[PATCH] btrfs: Return EXDEV for cross file system snapshot

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EXDEV seems an appropriate error if an operation fails bacause it
crosses file system boundaries.

Signed-off-by: Kusanagi Kouichi <slash@xxxxxxxxxxxxxxx>
---
 fs/btrfs/ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 21da576..15d35cb 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1544,7 +1544,7 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
 		if (src_inode->i_sb != file_inode(file)->i_sb) {
 			printk(KERN_INFO "btrfs: Snapshot src from "
 			       "another FS\n");
-			ret = -EINVAL;
+			ret = -EXDEV;
 		} else {
 			ret = btrfs_mksubvol(&file->f_path, name, namelen,
 					     BTRFS_I(src_inode)->root,
-- 
1.8.5.2

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