1 files changed, 4 insertions, 0 deletions

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index ae140c8abb5c..040b5a2e6556 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -1425,6 +1425,10 @@ static long gfs2_fallocate(struct inode *inode, int mode, loff_t offset,
         loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
         next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
 
+        /* We only support the FALLOC_FL_KEEP_SIZE mode */
+        if (mode && (mode != FALLOC_FL_KEEP_SIZE))
+                return -EOPNOTSUPP;
+
         offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
                  sdp->sd_sb.sb_bsize_shift;