[PATCH resend 2/2] btrfs: defrag: return EPERM not EINVAL when only permissions fail

We give EINVAL when the request is invalid; here it's ok but merely the
user has insufficient privileges.  Thus, this return value reflects the
error better -- as discussed in the identical case for dedupe.

According to codesearch.debian.net, no userspace program distinguishes
these values beyond strerror().

Signed-off-by: Adam Borowski <redacted>
---
 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 01c150b6ab62..e96e3c3caca1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c

@@ -2943,7 +2943,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
 	case S_IFREG:
 		if (!capable(CAP_SYS_ADMIN) &&
 		    inode_permission(inode, MAY_WRITE)) {
-			ret = -EINVAL;
+			ret = -EPERM;
 			goto out;
 		}
 

-- 
2.18.0