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Commit 869f9dfa authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Fix races between nfs_remove_bad_delegation() and delegation return 

Any attempt to call nfs_remove_bad_delegation() while a delegation is being
returned is currently a no-op. This means that we can end up looping
forever in nfs_end_delegation_return() if something causes the delegation
to be revoked.
This patch adds a mechanism whereby the state recovery code can communicate
to the delegation return code that the delegation is no longer valid and
that it should not be used when reclaiming state.
It also changes the return value for nfs4_handle_delegation_recall_error()
to ensure that nfs_end_delegation_return() does not reattempt the lock
reclaim before state recovery is done.

http://lkml.kernel.org/r/CAN-5tyHwG=Cn2Q9KsHWadewjpTTy_K26ee+UnSvHvG4192p-Xw@mail.gmail.com


Cc: stable@vger.kernel.org
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 0c116cad

fs/nfs/delegation.c

+21 −2
Original line number Diff line number Diff line
@@ -193,7 +193,11 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation * 
{

	int res = 0;



	res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);

	if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))

		res = nfs4_proc_delegreturn(inode,

				delegation->cred,

				&delegation->stateid,

				issync);

	nfs_free_delegation(delegation);

	return res;

}
@@ -380,11 +384,13 @@ static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation 
{

	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;

	struct nfs_inode *nfsi = NFS_I(inode);

	int err;

	int err = 0;



	if (delegation == NULL)

		return 0;

	do {

		if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))

			break;

		err = nfs_delegation_claim_opens(inode, &delegation->stateid);

		if (!issync || err != -EAGAIN)

			break;
@@ -605,10 +611,23 @@ static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *cl 
	rcu_read_unlock();

}



static void nfs_revoke_delegation(struct inode *inode)

{

	struct nfs_delegation *delegation;

	rcu_read_lock();

	delegation = rcu_dereference(NFS_I(inode)->delegation);

	if (delegation != NULL) {

		set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);

		nfs_mark_return_delegation(NFS_SERVER(inode), delegation);

	}

	rcu_read_unlock();

}



void nfs_remove_bad_delegation(struct inode *inode)

{

	struct nfs_delegation *delegation;



	nfs_revoke_delegation(inode);

	delegation = nfs_inode_detach_delegation(inode);

	if (delegation) {

		nfs_inode_find_state_and_recover(inode, &delegation->stateid);

fs/nfs/delegation.h

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ enum { 
	NFS_DELEGATION_RETURN_IF_CLOSED,

	NFS_DELEGATION_REFERENCED,

	NFS_DELEGATION_RETURNING,

	NFS_DELEGATION_REVOKED,

};



int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);

fs/nfs/nfs4proc.c

+1 −1
Original line number Diff line number Diff line
@@ -1654,7 +1654,7 @@ static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct 
			nfs_inode_find_state_and_recover(state->inode,

					stateid);

			nfs4_schedule_stateid_recovery(server, state);

			return 0;

			return -EAGAIN;

		case -NFS4ERR_DELAY:

		case -NFS4ERR_GRACE:

			set_bit(NFS_DELEGATED_STATE, &state->flags);