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Commit ad0fcd4e authored by Jeff Layton's avatar Jeff Layton Committed by Trond Myklebust
Browse files

nfs: explicitly reject LOCK_MAND flock() requests 



We have no mechanism to emulate LOCK_MAND locks on NFSv4, so explicitly
return -EINVAL if someone requests it.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent b042414f

fs/nfs/file.c

+9 −0
Original line number Diff line number Diff line
@@ -834,6 +834,15 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) 
	if (!(fl->fl_flags & FL_FLOCK))

		return -ENOLCK;



	/*

	 * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of

	 * any standard. In principle we might be able to support LOCK_MAND

	 * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the

	 * NFS code is not set up for it.

	 */

	if (fl->fl_type & LOCK_MAND)

		return -EINVAL;



	if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)

		is_local = 1;