[mirror_ubuntu-artful-kernel.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 "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);
	down_read(&nfsi->rwsem);
	delegation = 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:
	up_read(&nfsi->rwsem);
	iput(inode);
out_putclient:
	nfs_put_client(clp);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
	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;
	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,
								  nfs_validate_delegation_stateid(clp))) {
				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;

	/* 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
 * 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 int
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;
}

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

unsigned nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
{
	struct nfs_client *clp;
	int 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 */
unsigned nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy)
{
	struct nfs_client *clp;
	struct nfs4_slot_table *fc_tbl;
	int 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>
4ce79717	10	#include "nfs4_fs.h"
1da177e4 LT	11	#include "callback.h"
1da177e4 LT	12	#include "delegation.h"
24c8dbbb	13	#include "internal.h"
1da177e4	14
1d98fe67	15	#ifdef NFS_DEBUG
1da177e4	16	#define NFSDBG_FACILITY NFSDBG_CALLBACK
1d98fe67	17	#endif
1da177e4	18
e6f684f6	19	__be32 nfs4_callback_getattr(struct cb_getattrargs args, struct cb_getattrres res)
1da177e4	20	{
adfa6f98	21	struct nfs_client *clp;
1da177e4 LT	22	struct nfs_delegation *delegation;
	23	struct nfs_inode *nfsi;
	24	struct inode *inode;
1d98fe67	25
1da177e4 LT	26	res->bitmap[0] = res->bitmap[1] = 0;
1da177e4 LT	27	res->status = htonl(NFS4ERR_BADHANDLE);
ff052645	28	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	29	if (clp == NULL)
1da177e4 LT	30	goto out;
1d98fe67 CL	31
	32	dprintk("NFS: GETATTR callback request from %s\n",
	33	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	34
1da177e4 LT	35	inode = nfs_delegation_find_inode(clp, &args->fh);
	36	if (inode == NULL)
	37	goto out_putclient;
	38	nfsi = NFS_I(inode);
	39	down_read(&nfsi->rwsem);
	40	delegation = nfsi->delegation;
	41	if (delegation == NULL \|\| (delegation->type & FMODE_WRITE) == 0)
	42	goto out_iput;
	43	res->size = i_size_read(inode);
beb2a5ec TM	44	res->change_attr = delegation->change_attr;
	45	if (nfsi->npages != 0)
	46	res->change_attr++;
1da177e4 LT	47	res->ctime = inode->i_ctime;
	48	res->mtime = inode->i_mtime;
	49	res->bitmap[0] = (FATTR4_WORD0_CHANGE\|FATTR4_WORD0_SIZE) &
	50	args->bitmap[0];
	51	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA\|FATTR4_WORD1_TIME_MODIFY) &
	52	args->bitmap[1];
	53	res->status = 0;
	54	out_iput:
	55	up_read(&nfsi->rwsem);
	56	iput(inode);
	57	out_putclient:
24c8dbbb	58	nfs_put_client(clp);
1da177e4	59	out:
3110ff80	60	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
1da177e4 LT	61	return res->status;
	62	}
	63
2597641d AB	64	static int (nfs_validate_delegation_stateid(struct nfs_client clp))(struct nfs_delegation , const nfs4_stateid )
	65	{
	66	#if defined(CONFIG_NFS_V4_1)
	67	if (clp->cl_minorversion > 0)
	68	return nfs41_validate_delegation_stateid;
	69	#endif
	70	return nfs4_validate_delegation_stateid;
	71	}
	72
	73
e6f684f6	74	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy)
1da177e4	75	{
adfa6f98	76	struct nfs_client *clp;
1da177e4	77	struct inode *inode;
e6f684f6	78	__be32 res;
1da177e4 LT	79
1da177e4 LT	80	res = htonl(NFS4ERR_BADHANDLE);
ff052645	81	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	82	if (clp == NULL)
1da177e4 LT	83	goto out;
1d98fe67 CL	84
	85	dprintk("NFS: RECALL callback request from %s\n",
	86	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	87
3fbd67ad TM	88	do {
	89	struct nfs_client *prev = clp;
	90
	91	inode = nfs_delegation_find_inode(clp, &args->fh);
	92	if (inode != NULL) {
	93	/* Set up a helper thread to actually return the delegation */
2597641d AB	94	switch (nfs_async_inode_return_delegation(inode, &args->stateid,
2597641d AB	95	nfs_validate_delegation_stateid(clp))) {
3fbd67ad TM	96	case 0:
	97	res = 0;
	98	break;
	99	case -ENOENT:
	100	if (res != 0)
	101	res = htonl(NFS4ERR_BAD_STATEID);
	102	break;
	103	default:
	104	res = htonl(NFS4ERR_RESOURCE);
	105	}
	106	iput(inode);
	107	}
	108	clp = nfs_find_client_next(prev);
	109	nfs_put_client(prev);
	110	} while (clp != NULL);
1da177e4	111	out:
3110ff80	112	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
1da177e4 LT	113	return res;
1da177e4 LT	114	}
d49433e1	115
2597641d AB	116	int nfs4_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	117	{
	118	if (delegation == NULL \|\| memcmp(delegation->stateid.data, stateid->data,
	119	sizeof(delegation->stateid.data)) != 0)
	120	return 0;
	121	return 1;
	122	}
	123
d49433e1 BH	124	#if defined(CONFIG_NFS_V4_1)
d49433e1 BH	125
2597641d AB	126	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	127	{
	128	if (delegation == NULL)
	129	return 0;
	130
	131	/* seqid is 4-bytes long */
	132	if (((u32 *) &stateid->data)[0] != 0)
	133	return 0;
	134	if (memcmp(&delegation->stateid.data[4], &stateid->data[4],
	135	sizeof(stateid->data)-4))
	136	return 0;
	137
	138	return 1;
	139	}
	140
68f3f901 RL	141	/*
	142	* Validate the sequenceID sent by the server.
	143	* Return success if the sequenceID is one more than what we last saw on
	144	* this slot, accounting for wraparound. Increments the slot's sequence.
	145	*
4911096f AA	146	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	147	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	148	* since we only currently implement idempotent callbacks anyway.
	149	*
	150	* We have a single slot backchannel at this time, so we don't bother
	151	* checking the used_slots bit array on the table. The lower layer guarantees
	152	* a single outstanding callback request at a time.
	153	*/
	154	static int
b2f28bd7	155	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	156	{
	157	struct nfs4_slot *slot;
	158
	159	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	160	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	161
b2f28bd7	162	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	163	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	164
b2f28bd7	165	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	166	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	167
	168	/* Normal */
b2f28bd7	169	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901 RL	170	slot->seq_nr++;
	171	return htonl(NFS4_OK);
	172	}
	173
	174	/* Replay */
b2f28bd7	175	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	176	dprintk("%s seqid %d is a replay\n",
b2f28bd7	177	__func__, args->csa_sequenceid);
4911096f AA	178	/* Signal process_op to set this error on next op */
	179	if (args->csa_cachethis == 0)
	180	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	181
	182	/* The ca_maxresponsesize_cached is 0 with no DRC */
	183	else if (args->csa_cachethis == 1)
	184	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	185	}
	186
	187	/* Wraparound */
b2f28bd7	188	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901 RL	189	slot->seq_nr = 1;
	190	return htonl(NFS4_OK);
	191	}
	192
	193	/* Misordered request */
	194	return htonl(NFS4ERR_SEQ_MISORDERED);
	195	}
	196
963891ac RL	197	/*
	198	* Returns a pointer to a held 'struct nfs_client' that matches the server's
	199	* address, major version number, and session ID. It is the caller's
	200	* responsibility to release the returned reference.
	201	*
	202	* Returns NULL if there are no connections with sessions, or if no session
	203	* matches the one of interest.
	204	*/
	205	static struct nfs_client *find_client_with_session(
	206	const struct sockaddr *addr, u32 nfsversion,
	207	struct nfs4_sessionid *sessionid)
	208	{
	209	struct nfs_client *clp;
	210
	211	clp = nfs_find_client(addr, 4);
	212	if (clp == NULL)
	213	return NULL;
	214
	215	do {
	216	struct nfs_client *prev = clp;
	217
	218	if (clp->cl_session != NULL) {
	219	if (memcmp(clp->cl_session->sess_id.data,
	220	sessionid->data,
	221	NFS4_MAX_SESSIONID_LEN) == 0) {
	222	/* Returns a held reference to clp */
	223	return clp;
	224	}
	225	}
	226	clp = nfs_find_client_next(prev);
	227	nfs_put_client(prev);
	228	} while (clp != NULL);
	229
	230	return NULL;
	231	}
	232
a7989c3e MS	233	/*
	234	* For each referring call triple, check the session's slot table for
	235	* a match. If the slot is in use and the sequence numbers match, the
	236	* client is still waiting for a response to the original request.
	237	*/
	238	static bool referring_call_exists(struct nfs_client *clp,
	239	uint32_t nrclists,
	240	struct referring_call_list *rclists)
	241	{
	242	bool status = 0;
	243	int i, j;
	244	struct nfs4_session *session;
	245	struct nfs4_slot_table *tbl;
	246	struct referring_call_list *rclist;
	247	struct referring_call *ref;
	248
	249	/*
	250	* XXX When client trunking is implemented, this becomes
	251	* a session lookup from within the loop
	252	*/
	253	session = clp->cl_session;
	254	tbl = &session->fc_slot_table;
	255
	256	for (i = 0; i < nrclists; i++) {
	257	rclist = &rclists[i];
	258	if (memcmp(session->sess_id.data,
	259	rclist->rcl_sessionid.data,
	260	NFS4_MAX_SESSIONID_LEN) != 0)
	261	continue;
	262
	263	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	264	ref = &rclist->rcl_refcalls[j];
	265
	266	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	267	"slotid %u\n", __func__,
	268	((u32 *)&rclist->rcl_sessionid.data)[0],
	269	((u32 *)&rclist->rcl_sessionid.data)[1],
	270	((u32 *)&rclist->rcl_sessionid.data)[2],
	271	((u32 *)&rclist->rcl_sessionid.data)[3],
	272	ref->rc_sequenceid, ref->rc_slotid);
	273
	274	spin_lock(&tbl->slot_tbl_lock);
	275	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	276	tbl->slots[ref->rc_slotid].seq_nr ==
	277	ref->rc_sequenceid);
	278	spin_unlock(&tbl->slot_tbl_lock);
	279	if (status)
	280	goto out;
	281	}
	282	}
	283
	284	out:
	285	return status;
	286	}
	287
d49433e1 BH	288	unsigned nfs4_callback_sequence(struct cb_sequenceargs *args,
	289	struct cb_sequenceres *res)
	290	{
68f3f901 RL	291	struct nfs_client *clp;
68f3f901 RL	292	int i, status;
d49433e1	293
68f3f901 RL	294	status = htonl(NFS4ERR_BADSESSION);
	295	clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
	296	if (clp == NULL)
	297	goto out;
	298
b2f28bd7	299	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
68f3f901 RL	300	if (status)
	301	goto out_putclient;
	302
72ce2b3c MS	303	/*
	304	* Check for pending referring calls. If a match is found, a
	305	* related callback was received before the response to the original
	306	* call.
	307	*/
	308	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	309	status = htonl(NFS4ERR_DELAY);
	310	goto out_putclient;
	311	}
	312
d49433e1 BH	313	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	314	sizeof(res->csr_sessionid));
	315	res->csr_sequenceid = args->csa_sequenceid;
	316	res->csr_slotid = args->csa_slotid;
	317	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	318	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	319
68f3f901 RL	320	out_putclient:
	321	nfs_put_client(clp);
	322	out:
72ce2b3c MS	323	for (i = 0; i < args->csa_nrclists; i++)
	324	kfree(args->csa_rclists[i].rcl_refcalls);
	325	kfree(args->csa_rclists);
	326
4911096f AA	327	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
	328	res->csr_status = 0;
	329	else
	330	res->csr_status = status;
	331	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	332	ntohl(status), ntohl(res->csr_status));
	333	return status;
d49433e1 BH	334	}
d49433e1 BH	335
31f09607 AB	336	unsigned nfs4_callback_recallany(struct cb_recallanyargs args, void dummy)
	337	{
	338	struct nfs_client *clp;
	339	int status;
	340	fmode_t flags = 0;
	341
	342	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	343	clp = nfs_find_client(args->craa_addr, 4);
	344	if (clp == NULL)
	345	goto out;
	346
	347	dprintk("NFS: RECALL_ANY callback request from %s\n",
	348	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	349
	350	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	351	&args->craa_type_mask))
	352	flags = FMODE_READ;
	353	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	354	&args->craa_type_mask))
	355	flags \|= FMODE_WRITE;
	356
	357	if (flags)
	358	nfs_expire_all_delegation_types(clp, flags);
	359	status = htonl(NFS4_OK);
	360	out:
	361	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	362	return status;
	363	}
b9efa1b2 AA	364
	365	/* Reduce the fore channel's max_slots to the target value */
	366	unsigned nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy)
	367	{
	368	struct nfs_client *clp;
	369	struct nfs4_slot_table *fc_tbl;
	370	int status;
	371
	372	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	373	clp = nfs_find_client(args->crsa_addr, 4);
	374	if (clp == NULL)
	375	goto out;
	376
	377	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
	378	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
	379	args->crsa_target_max_slots);
	380
	381	fc_tbl = &clp->cl_session->fc_slot_table;
	382
	383	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	384	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	385	args->crsa_target_max_slots < 1)
bae0ac0e AA	386	goto out_putclient;
	387
	388	status = htonl(NFS4_OK);
	389	if (args->crsa_target_max_slots == fc_tbl->max_slots)
	390	goto out_putclient;
b9efa1b2 AA	391
	392	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	393	nfs41_handle_recall_slot(clp);
bae0ac0e	394	out_putclient:
b9efa1b2 AA	395	nfs_put_client(clp); /* balance nfs_find_client */
	396	out:
	397	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	398	return status;
	399	}
d49433e1	400	#endif /* CONFIG_NFS_V4_1 */