btrfs: replace error code from btrfs_drop_extents

There's a case which clone does not handle and used to BUG_ON instead,
(testcase xfstests/btrfs/035), now returns EINVAL. This error code is
confusing to the ioctl caller, as it normally signifies errorneous
arguments.

Change it to ENOPNOTSUPP which allows a fall back to copy instead of
clone. This does not affect the common reflink operation.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e7e78fa9085e..1eee3f79d75f 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -805,7 +805,7 @@ next_slot:
                 if (start > key.offset && end < extent_end) {
                         BUG_ON(del_nr > 0);
                         if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
-                                ret = -EINVAL;
+                                ret = -EOPNOTSUPP;
                                 break;
                         }
 
@@ -851,7 +851,7 @@ next_slot:
                  */
                 if (start <= key.offset && end < extent_end) {
                         if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
-                                ret = -EINVAL;
+                                ret = -EOPNOTSUPP;
                                 break;
                         }
 
@@ -877,7 +877,7 @@ next_slot:
                 if (start > key.offset && end >= extent_end) {
                         BUG_ON(del_nr > 0);
                         if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
-                                ret = -EINVAL;
+                                ret = -EOPNOTSUPP;
                                 break;
                         }