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Commit 2597641d authored by Alexandros Batsakis's avatar Alexandros Batsakis Committed by Trond Myklebust
Browse files

nfs41: v2 fix cb_recall bug 



in NFSv4.1 the seqid part of a stateid in CB_RECALL must be 0

Signed-off-by: default avatarAlexandros Batsakis <batsakis@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 0629e370

fs/nfs/callback.h

+4 −1
Original line number Diff line number Diff line
@@ -106,6 +106,8 @@ struct cb_sequenceres { 
extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,

				       struct cb_sequenceres *res);



extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,

					     const nfs4_stateid *stateid);



#define RCA4_TYPE_MASK_RDATA_DLG	0

#define RCA4_TYPE_MASK_WDATA_DLG	1
@@ -125,8 +127,9 @@ extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy); 
#ifdef CONFIG_NFS_V4

extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);

extern void nfs_callback_down(int minorversion);

extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,

					    const nfs4_stateid *stateid);

#endif /* CONFIG_NFS_V4 */



/*

 * nfs41: Callbacks are expected to not cause substantial latency,

 * so we limit their concurrency to 1 by setting up the maximum number

fs/nfs/callback_proc.c

+35 −2
Original line number Diff line number Diff line
@@ -61,6 +61,16 @@ out: 
	return res->status;

}



static int (*nfs_validate_delegation_stateid(struct nfs_client *clp))(struct nfs_delegation *, const nfs4_stateid *)

{

#if defined(CONFIG_NFS_V4_1)

	if (clp->cl_minorversion > 0)

		return nfs41_validate_delegation_stateid;

#endif

	return nfs4_validate_delegation_stateid;

}





__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)

{

	struct nfs_client *clp;
@@ -81,7 +91,8 @@ __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy) 
		inode = nfs_delegation_find_inode(clp, &args->fh);

		if (inode != NULL) {

			/* Set up a helper thread to actually return the delegation */

			switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {

			switch (nfs_async_inode_return_delegation(inode, &args->stateid,

								  nfs_validate_delegation_stateid(clp))) {

				case 0:

					res = 0;

					break;
@@ -102,8 +113,31 @@ out: 
	return res;

}



int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)

{

	if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,

					 sizeof(delegation->stateid.data)) != 0)

		return 0;

	return 1;

}



#if defined(CONFIG_NFS_V4_1)



int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)

{

	if (delegation == NULL)

		return 0;



	/* seqid is 4-bytes long */

	if (((u32 *) &stateid->data)[0] != 0)

		return 0;

	if (memcmp(&delegation->stateid.data[4], &stateid->data[4],

		   sizeof(stateid->data)-4))

		return 0;



	return 1;

}



/*

 * Validate the sequenceID sent by the server.

 * Return success if the sequenceID is one more than what we last saw on
@@ -255,5 +289,4 @@ out: 
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));

	return status;

}



#endif /* CONFIG_NFS_V4_1 */

fs/nfs/delegation.c

+6 −3
Original line number Diff line number Diff line
@@ -454,18 +454,21 @@ void nfs_expire_unreferenced_delegations(struct nfs_client *clp) 
/*

 * Asynchronous delegation recall!

 */

int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid)

int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid,

				      int (*validate_stateid)(struct nfs_delegation *delegation,

							      const nfs4_stateid *stateid))

{

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

	struct nfs_delegation *delegation;



	rcu_read_lock();

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

	if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,

				sizeof(delegation->stateid.data)) != 0) {



	if (!validate_stateid(delegation, stateid)) {

		rcu_read_unlock();

		return -ENOENT;

	}



	nfs_mark_return_delegation(clp, delegation);

	rcu_read_unlock();

	nfs_delegation_run_state_manager(clp);

fs/nfs/delegation.h

+3 −1
Original line number Diff line number Diff line
@@ -34,7 +34,9 @@ enum { 
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);

void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);

int nfs_inode_return_delegation(struct inode *inode);

int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);

int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid,

				      int (*validate_stateid)(struct nfs_delegation *delegation,

							      const nfs4_stateid *stateid));

void nfs_inode_return_delegation_noreclaim(struct inode *inode);



struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);