[net-next-2.6.git] / fs / nfs / callback_proc.c

/*
 * linux/fs/nfs/callback_proc.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback procedures
 */
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"

#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif
 
__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
{
	struct nfs_client *clp;
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: GETATTR callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	inode = nfs_delegation_find_inode(clp, &args->fh);
	if (inode == NULL)
		goto out_putclient;
	nfsi = NFS_I(inode);
	rcu_read_lock();
	delegation = rcu_dereference(nfsi->delegation);
	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
		goto out_iput;
	res->size = i_size_read(inode);
	res->change_attr = delegation->change_attr;
	if (nfsi->npages != 0)
		res->change_attr++;
	res->ctime = inode->i_ctime;
	res->mtime = inode->i_mtime;
	res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
		args->bitmap[0];
	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
		args->bitmap[1];
	res->status = 0;
out_iput:
	rcu_read_unlock();
	iput(inode);
out_putclient:
	nfs_put_client(clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
	return res->status;
}

__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
{
	struct nfs_client *clp;
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: RECALL callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	do {
		struct nfs_client *prev = clp;

		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)) {
				case 0:
					res = 0;
					break;
				case -ENOENT:
					if (res != 0)
						res = htonl(NFS4ERR_BAD_STATEID);
					break;
				default:
					res = htonl(NFS4ERR_RESOURCE);
			}
			iput(inode);
		}
		clp = nfs_find_client_next(prev);
		nfs_put_client(prev);
	} while (clp != NULL);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
	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;

	if (stateid->stateid.seqid != 0)
		return 0;
	if (memcmp(&delegation->stateid.stateid.other,
		   &stateid->stateid.other,
		   NFS4_STATEID_OTHER_SIZE))
		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
 * this slot, accounting for wraparound.  Increments the slot's sequence.
 *
 * We don't yet implement a duplicate request cache, instead we set the
 * back channel ca_maxresponsesize_cached to zero. This is OK for now
 * since we only currently implement idempotent callbacks anyway.
 *
 * We have a single slot backchannel at this time, so we don't bother
 * checking the used_slots bit array on the table.  The lower layer guarantees
 * a single outstanding callback request at a time.
 */
static __be32
validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
{
	struct nfs4_slot *slot;

	dprintk("%s enter. slotid %d seqid %d\n",
		__func__, args->csa_slotid, args->csa_sequenceid);

	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
		return htonl(NFS4ERR_BADSLOT);

	slot = tbl->slots + args->csa_slotid;
	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);

	/* Normal */
	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
		slot->seq_nr++;
		return htonl(NFS4_OK);
	}

	/* Replay */
	if (args->csa_sequenceid == slot->seq_nr) {
		dprintk("%s seqid %d is a replay\n",
			__func__, args->csa_sequenceid);
		/* Signal process_op to set this error on next op */
		if (args->csa_cachethis == 0)
			return htonl(NFS4ERR_RETRY_UNCACHED_REP);

		/* The ca_maxresponsesize_cached is 0 with no DRC */
		else if (args->csa_cachethis == 1)
			return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
	}

	/* Wraparound */
	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
		slot->seq_nr = 1;
		return htonl(NFS4_OK);
	}

	/* Misordered request */
	return htonl(NFS4ERR_SEQ_MISORDERED);
}

/*
 * Returns a pointer to a held 'struct nfs_client' that matches the server's
 * address, major version number, and session ID.  It is the caller's
 * responsibility to release the returned reference.
 *
 * Returns NULL if there are no connections with sessions, or if no session
 * matches the one of interest.
 */
 static struct nfs_client *find_client_with_session(
	const struct sockaddr *addr, u32 nfsversion,
	struct nfs4_sessionid *sessionid)
{
	struct nfs_client *clp;

	clp = nfs_find_client(addr, 4);
	if (clp == NULL)
		return NULL;

	do {
		struct nfs_client *prev = clp;

		if (clp->cl_session != NULL) {
			if (memcmp(clp->cl_session->sess_id.data,
					sessionid->data,
					NFS4_MAX_SESSIONID_LEN) == 0) {
				/* Returns a held reference to clp */
				return clp;
			}
		}
		clp = nfs_find_client_next(prev);
		nfs_put_client(prev);
	} while (clp != NULL);

	return NULL;
}

/*
 * For each referring call triple, check the session's slot table for
 * a match.  If the slot is in use and the sequence numbers match, the
 * client is still waiting for a response to the original request.
 */
static bool referring_call_exists(struct nfs_client *clp,
				  uint32_t nrclists,
				  struct referring_call_list *rclists)
{
	bool status = 0;
	int i, j;
	struct nfs4_session *session;
	struct nfs4_slot_table *tbl;
	struct referring_call_list *rclist;
	struct referring_call *ref;

	/*
	 * XXX When client trunking is implemented, this becomes
	 * a session lookup from within the loop
	 */
	session = clp->cl_session;
	tbl = &session->fc_slot_table;

	for (i = 0; i < nrclists; i++) {
		rclist = &rclists[i];
		if (memcmp(session->sess_id.data,
			   rclist->rcl_sessionid.data,
			   NFS4_MAX_SESSIONID_LEN) != 0)
			continue;

		for (j = 0; j < rclist->rcl_nrefcalls; j++) {
			ref = &rclist->rcl_refcalls[j];

			dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
				"slotid %u\n", __func__,
				((u32 *)&rclist->rcl_sessionid.data)[0],
				((u32 *)&rclist->rcl_sessionid.data)[1],
				((u32 *)&rclist->rcl_sessionid.data)[2],
				((u32 *)&rclist->rcl_sessionid.data)[3],
				ref->rc_sequenceid, ref->rc_slotid);

			spin_lock(&tbl->slot_tbl_lock);
			status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
				  tbl->slots[ref->rc_slotid].seq_nr ==
					ref->rc_sequenceid);
			spin_unlock(&tbl->slot_tbl_lock);
			if (status)
				goto out;
		}
	}

out:
	return status;
}

__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
				struct cb_sequenceres *res)
{
	struct nfs_client *clp;
	int i;
	__be32 status;

	status = htonl(NFS4ERR_BADSESSION);
	clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
	if (clp == NULL)
		goto out;

	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
	if (status)
		goto out_putclient;

	/*
	 * Check for pending referring calls.  If a match is found, a
	 * related callback was received before the response to the original
	 * call.
	 */
	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
		status = htonl(NFS4ERR_DELAY);
		goto out_putclient;
	}

	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	       sizeof(res->csr_sessionid));
	res->csr_sequenceid = args->csa_sequenceid;
	res->csr_slotid = args->csa_slotid;
	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;

out_putclient:
	nfs_put_client(clp);
out:
	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);

	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
		res->csr_status = 0;
	else
		res->csr_status = status;
	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
		ntohl(status), ntohl(res->csr_status));
	return status;
}

__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
{
	struct nfs_client *clp;
	__be32 status;
	fmode_t flags = 0;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	clp = nfs_find_client(args->craa_addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: RECALL_ANY callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
		     &args->craa_type_mask))
		flags = FMODE_READ;
	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
		     &args->craa_type_mask))
		flags |= FMODE_WRITE;

	if (flags)
		nfs_expire_all_delegation_types(clp, flags);
	status = htonl(NFS4_OK);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

/* Reduce the fore channel's max_slots to the target value */
__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy)
{
	struct nfs_client *clp;
	struct nfs4_slot_table *fc_tbl;
	__be32 status;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	clp = nfs_find_client(args->crsa_addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
		args->crsa_target_max_slots);

	fc_tbl = &clp->cl_session->fc_slot_table;

	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
	if (args->crsa_target_max_slots > fc_tbl->max_slots ||
	    args->crsa_target_max_slots < 1)
		goto out_putclient;

	status = htonl(NFS4_OK);
	if (args->crsa_target_max_slots == fc_tbl->max_slots)
		goto out_putclient;

	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	nfs41_handle_recall_slot(clp);
out_putclient:
	nfs_put_client(clp);	/* balance nfs_find_client */
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}
#endif /* CONFIG_NFS_V4_1 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfs/callback_proc.c
	3	*
	4	* Copyright (C) 2004 Trond Myklebust
	5	*
	6	* NFSv4 callback procedures
	7	*/
1da177e4 LT	8	#include <linux/nfs4.h>
1da177e4 LT	9	#include <linux/nfs_fs.h>
5a0e3ad6	10	#include <linux/slab.h>
4ce79717	11	#include "nfs4_fs.h"
1da177e4 LT	12	#include "callback.h"
1da177e4 LT	13	#include "delegation.h"
24c8dbbb	14	#include "internal.h"
1da177e4	15
1d98fe67	16	#ifdef NFS_DEBUG
1da177e4	17	#define NFSDBG_FACILITY NFSDBG_CALLBACK
1d98fe67	18	#endif
1da177e4	19
e6f684f6	20	__be32 nfs4_callback_getattr(struct cb_getattrargs args, struct cb_getattrres res)
1da177e4	21	{
adfa6f98	22	struct nfs_client *clp;
1da177e4 LT	23	struct nfs_delegation *delegation;
	24	struct nfs_inode *nfsi;
	25	struct inode *inode;
1d98fe67	26
1da177e4 LT	27	res->bitmap[0] = res->bitmap[1] = 0;
1da177e4 LT	28	res->status = htonl(NFS4ERR_BADHANDLE);
ff052645	29	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	30	if (clp == NULL)
1da177e4 LT	31	goto out;
1d98fe67 CL	32
	33	dprintk("NFS: GETATTR callback request from %s\n",
	34	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	35
1da177e4 LT	36	inode = nfs_delegation_find_inode(clp, &args->fh);
	37	if (inode == NULL)
	38	goto out_putclient;
	39	nfsi = NFS_I(inode);
761fe93c TM	40	rcu_read_lock();
761fe93c TM	41	delegation = rcu_dereference(nfsi->delegation);
1da177e4 LT	42	if (delegation == NULL \|\| (delegation->type & FMODE_WRITE) == 0)
	43	goto out_iput;
	44	res->size = i_size_read(inode);
beb2a5ec TM	45	res->change_attr = delegation->change_attr;
	46	if (nfsi->npages != 0)
	47	res->change_attr++;
1da177e4 LT	48	res->ctime = inode->i_ctime;
	49	res->mtime = inode->i_mtime;
	50	res->bitmap[0] = (FATTR4_WORD0_CHANGE\|FATTR4_WORD0_SIZE) &
	51	args->bitmap[0];
	52	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA\|FATTR4_WORD1_TIME_MODIFY) &
	53	args->bitmap[1];
	54	res->status = 0;
	55	out_iput:
761fe93c	56	rcu_read_unlock();
1da177e4 LT	57	iput(inode);
1da177e4 LT	58	out_putclient:
24c8dbbb	59	nfs_put_client(clp);
1da177e4	60	out:
3110ff80	61	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
1da177e4 LT	62	return res->status;
	63	}
	64
e6f684f6	65	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy)
1da177e4	66	{
adfa6f98	67	struct nfs_client *clp;
1da177e4	68	struct inode *inode;
e6f684f6	69	__be32 res;
1da177e4 LT	70
1da177e4 LT	71	res = htonl(NFS4ERR_BADHANDLE);
ff052645	72	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	73	if (clp == NULL)
1da177e4 LT	74	goto out;
1d98fe67 CL	75
	76	dprintk("NFS: RECALL callback request from %s\n",
	77	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	78
3fbd67ad TM	79	do {
	80	struct nfs_client *prev = clp;
	81
	82	inode = nfs_delegation_find_inode(clp, &args->fh);
	83	if (inode != NULL) {
	84	/* Set up a helper thread to actually return the delegation */
e047a10c	85	switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
3fbd67ad TM	86	case 0:
	87	res = 0;
	88	break;
	89	case -ENOENT:
	90	if (res != 0)
	91	res = htonl(NFS4ERR_BAD_STATEID);
	92	break;
	93	default:
	94	res = htonl(NFS4ERR_RESOURCE);
	95	}
	96	iput(inode);
	97	}
	98	clp = nfs_find_client_next(prev);
	99	nfs_put_client(prev);
	100	} while (clp != NULL);
1da177e4	101	out:
3110ff80	102	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
1da177e4 LT	103	return res;
1da177e4 LT	104	}
d49433e1	105
2597641d AB	106	int nfs4_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	107	{
	108	if (delegation == NULL \|\| memcmp(delegation->stateid.data, stateid->data,
	109	sizeof(delegation->stateid.data)) != 0)
	110	return 0;
	111	return 1;
	112	}
	113
d49433e1 BH	114	#if defined(CONFIG_NFS_V4_1)
d49433e1 BH	115
2597641d AB	116	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	117	{
	118	if (delegation == NULL)
	119	return 0;
	120
94499252	121	if (stateid->stateid.seqid != 0)
2597641d	122	return 0;
94499252 AB	123	if (memcmp(&delegation->stateid.stateid.other,
	124	&stateid->stateid.other,
	125	NFS4_STATEID_OTHER_SIZE))
2597641d AB	126	return 0;
	127
	128	return 1;
	129	}
	130
68f3f901 RL	131	/*
	132	* Validate the sequenceID sent by the server.
	133	* Return success if the sequenceID is one more than what we last saw on
	134	* this slot, accounting for wraparound. Increments the slot's sequence.
	135	*
4911096f AA	136	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	137	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	138	* since we only currently implement idempotent callbacks anyway.
	139	*
	140	* We have a single slot backchannel at this time, so we don't bother
	141	* checking the used_slots bit array on the table. The lower layer guarantees
	142	* a single outstanding callback request at a time.
	143	*/
9733f0d9	144	static __be32
b2f28bd7	145	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	146	{
	147	struct nfs4_slot *slot;
	148
	149	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	150	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	151
b2f28bd7	152	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	153	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	154
b2f28bd7	155	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	156	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	157
	158	/* Normal */
b2f28bd7	159	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901 RL	160	slot->seq_nr++;
	161	return htonl(NFS4_OK);
	162	}
	163
	164	/* Replay */
b2f28bd7	165	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	166	dprintk("%s seqid %d is a replay\n",
b2f28bd7	167	__func__, args->csa_sequenceid);
4911096f AA	168	/* Signal process_op to set this error on next op */
	169	if (args->csa_cachethis == 0)
	170	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	171
	172	/* The ca_maxresponsesize_cached is 0 with no DRC */
	173	else if (args->csa_cachethis == 1)
	174	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	175	}
	176
	177	/* Wraparound */
b2f28bd7	178	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901 RL	179	slot->seq_nr = 1;
	180	return htonl(NFS4_OK);
	181	}
	182
	183	/* Misordered request */
	184	return htonl(NFS4ERR_SEQ_MISORDERED);
	185	}
	186
963891ac RL	187	/*
	188	* Returns a pointer to a held 'struct nfs_client' that matches the server's
	189	* address, major version number, and session ID. It is the caller's
	190	* responsibility to release the returned reference.
	191	*
	192	* Returns NULL if there are no connections with sessions, or if no session
	193	* matches the one of interest.
	194	*/
	195	static struct nfs_client *find_client_with_session(
	196	const struct sockaddr *addr, u32 nfsversion,
	197	struct nfs4_sessionid *sessionid)
	198	{
	199	struct nfs_client *clp;
	200
	201	clp = nfs_find_client(addr, 4);
	202	if (clp == NULL)
	203	return NULL;
	204
	205	do {
	206	struct nfs_client *prev = clp;
	207
	208	if (clp->cl_session != NULL) {
	209	if (memcmp(clp->cl_session->sess_id.data,
	210	sessionid->data,
	211	NFS4_MAX_SESSIONID_LEN) == 0) {
	212	/* Returns a held reference to clp */
	213	return clp;
	214	}
	215	}
	216	clp = nfs_find_client_next(prev);
	217	nfs_put_client(prev);
	218	} while (clp != NULL);
	219
	220	return NULL;
	221	}
	222
a7989c3e MS	223	/*
	224	* For each referring call triple, check the session's slot table for
	225	* a match. If the slot is in use and the sequence numbers match, the
	226	* client is still waiting for a response to the original request.
	227	*/
	228	static bool referring_call_exists(struct nfs_client *clp,
	229	uint32_t nrclists,
	230	struct referring_call_list *rclists)
	231	{
	232	bool status = 0;
	233	int i, j;
	234	struct nfs4_session *session;
	235	struct nfs4_slot_table *tbl;
	236	struct referring_call_list *rclist;
	237	struct referring_call *ref;
	238
	239	/*
	240	* XXX When client trunking is implemented, this becomes
	241	* a session lookup from within the loop
	242	*/
	243	session = clp->cl_session;
	244	tbl = &session->fc_slot_table;
	245
	246	for (i = 0; i < nrclists; i++) {
	247	rclist = &rclists[i];
	248	if (memcmp(session->sess_id.data,
	249	rclist->rcl_sessionid.data,
	250	NFS4_MAX_SESSIONID_LEN) != 0)
	251	continue;
	252
	253	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	254	ref = &rclist->rcl_refcalls[j];
	255
	256	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	257	"slotid %u\n", __func__,
	258	((u32 *)&rclist->rcl_sessionid.data)[0],
	259	((u32 *)&rclist->rcl_sessionid.data)[1],
	260	((u32 *)&rclist->rcl_sessionid.data)[2],
	261	((u32 *)&rclist->rcl_sessionid.data)[3],
	262	ref->rc_sequenceid, ref->rc_slotid);
	263
	264	spin_lock(&tbl->slot_tbl_lock);
	265	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	266	tbl->slots[ref->rc_slotid].seq_nr ==
	267	ref->rc_sequenceid);
	268	spin_unlock(&tbl->slot_tbl_lock);
	269	if (status)
	270	goto out;
	271	}
	272	}
	273
	274	out:
	275	return status;
	276	}
	277
9733f0d9	278	__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
d49433e1 BH	279	struct cb_sequenceres *res)
d49433e1 BH	280	{
68f3f901	281	struct nfs_client *clp;
9733f0d9 AA	282	int i;
9733f0d9 AA	283	__be32 status;
d49433e1	284
68f3f901 RL	285	status = htonl(NFS4ERR_BADSESSION);
	286	clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
	287	if (clp == NULL)
	288	goto out;
	289
b2f28bd7	290	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
68f3f901 RL	291	if (status)
	292	goto out_putclient;
	293
72ce2b3c MS	294	/*
	295	* Check for pending referring calls. If a match is found, a
	296	* related callback was received before the response to the original
	297	* call.
	298	*/
	299	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	300	status = htonl(NFS4ERR_DELAY);
	301	goto out_putclient;
	302	}
	303
d49433e1 BH	304	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	305	sizeof(res->csr_sessionid));
	306	res->csr_sequenceid = args->csa_sequenceid;
	307	res->csr_slotid = args->csa_slotid;
	308	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	309	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	310
68f3f901 RL	311	out_putclient:
	312	nfs_put_client(clp);
	313	out:
72ce2b3c MS	314	for (i = 0; i < args->csa_nrclists; i++)
	315	kfree(args->csa_rclists[i].rcl_refcalls);
	316	kfree(args->csa_rclists);
	317
4911096f AA	318	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
	319	res->csr_status = 0;
	320	else
	321	res->csr_status = status;
	322	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	323	ntohl(status), ntohl(res->csr_status));
	324	return status;
d49433e1 BH	325	}
d49433e1 BH	326
9733f0d9	327	__be32 nfs4_callback_recallany(struct cb_recallanyargs args, void dummy)
31f09607 AB	328	{
31f09607 AB	329	struct nfs_client *clp;
9733f0d9	330	__be32 status;
31f09607 AB	331	fmode_t flags = 0;
	332
	333	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	334	clp = nfs_find_client(args->craa_addr, 4);
	335	if (clp == NULL)
	336	goto out;
	337
	338	dprintk("NFS: RECALL_ANY callback request from %s\n",
	339	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	340
	341	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	342	&args->craa_type_mask))
	343	flags = FMODE_READ;
	344	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	345	&args->craa_type_mask))
	346	flags \|= FMODE_WRITE;
	347
	348	if (flags)
	349	nfs_expire_all_delegation_types(clp, flags);
	350	status = htonl(NFS4_OK);
	351	out:
	352	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	353	return status;
	354	}
b9efa1b2 AA	355
b9efa1b2 AA	356	/* Reduce the fore channel's max_slots to the target value */
9733f0d9	357	__be32 nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy)
b9efa1b2 AA	358	{
	359	struct nfs_client *clp;
	360	struct nfs4_slot_table *fc_tbl;
9733f0d9	361	__be32 status;
b9efa1b2 AA	362
	363	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	364	clp = nfs_find_client(args->crsa_addr, 4);
	365	if (clp == NULL)
	366	goto out;
	367
	368	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
	369	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
	370	args->crsa_target_max_slots);
	371
	372	fc_tbl = &clp->cl_session->fc_slot_table;
	373
	374	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	375	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	376	args->crsa_target_max_slots < 1)
bae0ac0e AA	377	goto out_putclient;
	378
	379	status = htonl(NFS4_OK);
	380	if (args->crsa_target_max_slots == fc_tbl->max_slots)
	381	goto out_putclient;
b9efa1b2 AA	382
	383	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	384	nfs41_handle_recall_slot(clp);
bae0ac0e	385	out_putclient:
b9efa1b2 AA	386	nfs_put_client(clp); /* balance nfs_find_client */
	387	out:
	388	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	389	return status;
	390	}
d49433e1	391	#endif /* CONFIG_NFS_V4_1 */