Commit 11476e9d authored Apr 11, 2016 by Chuck Lever Committed by Anna Schumaker May 09, 2016

NFS: Fix an LOCK/OPEN race when unlinking an open file



At Connectathon 2016, we found that recent upstream Linux clients
would occasionally send a LOCK operation with a zero stateid. This
appeared to happen in close proximity to another thread returning
a delegation before unlinking the same file while it remained open.

Earlier, the client received a write delegation on this file and
returned the open stateid. Now, as it is getting ready to unlink the
file, it returns the write delegation. But there is still an open
file descriptor on that file, so the client must OPEN the file
again before it returns the delegation.

Since commit 24311f88 ('NFSv4: Recovery of recalled read
delegations is broken'), nfs_open_delegation_recall() clears the
NFS_DELEGATED_STATE flag _before_ it sends the OPEN. This allows a
racing LOCK on the same inode to be put on the wire before the OPEN
operation has returned a valid open stateid.

To eliminate this race, serialize delegation return with the
acquisition of a file lock on the same file. Adopt the same approach
as is used in the unlock path.

This patch also eliminates a similar race seen when sending a LOCK
operation at the same time as returning a delegation on the same file.

Fixes: 24311f88 ('NFSv4: Recovery of recalled read ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[Anna: Add sentence about LOCK / delegation race]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

parent 3064b686

fs/nfs/nfs4proc.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -6054,6 +6054,7 @@ static int nfs41_lock_expired(struct nfs4_state state, struct file_lock reques
		static int _nfs4_proc_setlk(struct nfs4_state state, int cmd, struct file_lock request)
		{
		struct nfs_inode *nfsi = NFS_I(state->inode);
		struct nfs4_state_owner *sp = state->owner;
		unsigned char fl_flags = request->fl_flags;
		int status = -ENOLCK;

		@@ -6068,6 +6069,7 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock
		status = do_vfs_lock(state->inode, request);
		if (status < 0)
		goto out;
		mutex_lock(&sp->so_delegreturn_mutex);
		down_read(&nfsi->rwsem);
		if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
		/* Yes: cache locks! */
		@@ -6075,9 +6077,11 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock
		request->fl_flags = fl_flags & ~FL_SLEEP;
		status = do_vfs_lock(state->inode, request);
		up_read(&nfsi->rwsem);
		mutex_unlock(&sp->so_delegreturn_mutex);
		goto out;
		}
		up_read(&nfsi->rwsem);
		mutex_unlock(&sp->so_delegreturn_mutex);
		status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
		out:
		request->fl_flags = fl_flags;

Admin message