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>

2 files changed, 5 insertions, 5 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;
                         }
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f2e8fcc279a3..7b001abc73c7 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3088,7 +3088,7 @@ process_slot:
                                                          new_key.offset + datal,
                                                          1);
                                 if (ret) {
-                                        if (ret != -EINVAL)
+                                        if (ret != -EOPNOTSUPP)
                                                 btrfs_abort_transaction(trans,
                                                                 root, ret);
                                         btrfs_end_transaction(trans, root);
@@ -3163,7 +3163,7 @@ process_slot:
                                                          new_key.offset + datal,
                                                          1);
                                 if (ret) {
-                                        if (ret != -EINVAL)
+                                        if (ret != -EOPNOTSUPP)
                                                 btrfs_abort_transaction(trans,
                                                         root, ret);
                                         btrfs_end_transaction(trans, root);