nfs: verify open flags before allowing an atomic open

Currently, you can open a NFSv4 file with O_APPEND|O_DIRECT, but cannot
fcntl(F_SETFL,...) with those flags. This flag combination is explicitly
forbidden on NFSv3 opens, and it seems like it should also be on NFSv4.

Reported-by: Chao Ye <cye@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e474ca2..39e69d4 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1413,6 +1413,10 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
        dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n",
                        dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
 
+       err = nfs_check_flags(open_flags);
+       if (err)
+               return err;
+
        /* NFS only supports OPEN on regular files */
        if ((open_flags & O_DIRECTORY)) {
                if (!d_unhashed(dentry)) {