make the feature checks in ->fallocate future proof

Instead of various home grown checks that might need updates for new
flags just check for any bit outside the mask of the features supported
by the filesystem.  This makes the check future proof for any newly
added flag.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a3798a3aa0d2..64daf2acd0d5 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7116,7 +7116,7 @@ static long btrfs_fallocate(struct inode *inode, int mode,
         alloc_end =  (offset + len + mask) & ~mask;
 
         /* We only support the FALLOC_FL_KEEP_SIZE mode */
-        if (mode && (mode != FALLOC_FL_KEEP_SIZE))
+        if (mode & ~FALLOC_FL_KEEP_SIZE)
                 return -EOPNOTSUPP;
 
         /*