[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);
	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 __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);
	40	down_read(&nfsi->rwsem);
	41	delegation = nfsi->delegation;
	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:
	56	up_read(&nfsi->rwsem);
	57	iput(inode);
	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
2597641d AB	65	static int (nfs_validate_delegation_stateid(struct nfs_client clp))(struct nfs_delegation , const nfs4_stateid )
	66	{
	67	#if defined(CONFIG_NFS_V4_1)
	68	if (clp->cl_minorversion > 0)
	69	return nfs41_validate_delegation_stateid;
	70	#endif
	71	return nfs4_validate_delegation_stateid;
	72	}
	73
	74
e6f684f6	75	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy)
1da177e4	76	{
adfa6f98	77	struct nfs_client *clp;
1da177e4	78	struct inode *inode;
e6f684f6	79	__be32 res;
1da177e4 LT	80
1da177e4 LT	81	res = htonl(NFS4ERR_BADHANDLE);
ff052645	82	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	83	if (clp == NULL)
1da177e4 LT	84	goto out;
1d98fe67 CL	85
	86	dprintk("NFS: RECALL callback request from %s\n",
	87	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	88
3fbd67ad TM	89	do {
	90	struct nfs_client *prev = clp;
	91
	92	inode = nfs_delegation_find_inode(clp, &args->fh);
	93	if (inode != NULL) {
	94	/* Set up a helper thread to actually return the delegation */
2597641d AB	95	switch (nfs_async_inode_return_delegation(inode, &args->stateid,
2597641d AB	96	nfs_validate_delegation_stateid(clp))) {
3fbd67ad TM	97	case 0:
	98	res = 0;
	99	break;
	100	case -ENOENT:
	101	if (res != 0)
	102	res = htonl(NFS4ERR_BAD_STATEID);
	103	break;
	104	default:
	105	res = htonl(NFS4ERR_RESOURCE);
	106	}
	107	iput(inode);
	108	}
	109	clp = nfs_find_client_next(prev);
	110	nfs_put_client(prev);
	111	} while (clp != NULL);
1da177e4	112	out:
3110ff80	113	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
1da177e4 LT	114	return res;
1da177e4 LT	115	}
d49433e1	116
2597641d AB	117	int nfs4_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	118	{
	119	if (delegation == NULL \|\| memcmp(delegation->stateid.data, stateid->data,
	120	sizeof(delegation->stateid.data)) != 0)
	121	return 0;
	122	return 1;
	123	}
	124
d49433e1 BH	125	#if defined(CONFIG_NFS_V4_1)
d49433e1 BH	126
2597641d AB	127	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	128	{
	129	if (delegation == NULL)
	130	return 0;
	131
	132	/* seqid is 4-bytes long */
	133	if (((u32 *) &stateid->data)[0] != 0)
	134	return 0;
	135	if (memcmp(&delegation->stateid.data[4], &stateid->data[4],
	136	sizeof(stateid->data)-4))
	137	return 0;
	138
	139	return 1;
	140	}
	141
68f3f901 RL	142	/*
	143	* Validate the sequenceID sent by the server.
	144	* Return success if the sequenceID is one more than what we last saw on
	145	* this slot, accounting for wraparound. Increments the slot's sequence.
	146	*
4911096f AA	147	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	148	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	149	* since we only currently implement idempotent callbacks anyway.
	150	*
	151	* We have a single slot backchannel at this time, so we don't bother
	152	* checking the used_slots bit array on the table. The lower layer guarantees
	153	* a single outstanding callback request at a time.
	154	*/
9733f0d9	155	static __be32
b2f28bd7	156	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	157	{
	158	struct nfs4_slot *slot;
	159
	160	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	161	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	162
b2f28bd7	163	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	164	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	165
b2f28bd7	166	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	167	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	168
	169	/* Normal */
b2f28bd7	170	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901 RL	171	slot->seq_nr++;
	172	return htonl(NFS4_OK);
	173	}
	174
	175	/* Replay */
b2f28bd7	176	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	177	dprintk("%s seqid %d is a replay\n",
b2f28bd7	178	__func__, args->csa_sequenceid);
4911096f AA	179	/* Signal process_op to set this error on next op */
	180	if (args->csa_cachethis == 0)
	181	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	182
	183	/* The ca_maxresponsesize_cached is 0 with no DRC */
	184	else if (args->csa_cachethis == 1)
	185	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	186	}
	187
	188	/* Wraparound */
b2f28bd7	189	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901 RL	190	slot->seq_nr = 1;
	191	return htonl(NFS4_OK);
	192	}
	193
	194	/* Misordered request */
	195	return htonl(NFS4ERR_SEQ_MISORDERED);
	196	}
	197
963891ac RL	198	/*
	199	* Returns a pointer to a held 'struct nfs_client' that matches the server's
	200	* address, major version number, and session ID. It is the caller's
	201	* responsibility to release the returned reference.
	202	*
	203	* Returns NULL if there are no connections with sessions, or if no session
	204	* matches the one of interest.
	205	*/
	206	static struct nfs_client *find_client_with_session(
	207	const struct sockaddr *addr, u32 nfsversion,
	208	struct nfs4_sessionid *sessionid)
	209	{
	210	struct nfs_client *clp;
	211
	212	clp = nfs_find_client(addr, 4);
	213	if (clp == NULL)
	214	return NULL;
	215
	216	do {
	217	struct nfs_client *prev = clp;
	218
	219	if (clp->cl_session != NULL) {
	220	if (memcmp(clp->cl_session->sess_id.data,
	221	sessionid->data,
	222	NFS4_MAX_SESSIONID_LEN) == 0) {
	223	/* Returns a held reference to clp */
	224	return clp;
	225	}
	226	}
	227	clp = nfs_find_client_next(prev);
	228	nfs_put_client(prev);
	229	} while (clp != NULL);
	230
	231	return NULL;
	232	}
	233
a7989c3e MS	234	/*
	235	* For each referring call triple, check the session's slot table for
	236	* a match. If the slot is in use and the sequence numbers match, the
	237	* client is still waiting for a response to the original request.
	238	*/
	239	static bool referring_call_exists(struct nfs_client *clp,
	240	uint32_t nrclists,
	241	struct referring_call_list *rclists)
	242	{
	243	bool status = 0;
	244	int i, j;
	245	struct nfs4_session *session;
	246	struct nfs4_slot_table *tbl;
	247	struct referring_call_list *rclist;
	248	struct referring_call *ref;
	249
	250	/*
	251	* XXX When client trunking is implemented, this becomes
	252	* a session lookup from within the loop
	253	*/
	254	session = clp->cl_session;
	255	tbl = &session->fc_slot_table;
	256
	257	for (i = 0; i < nrclists; i++) {
	258	rclist = &rclists[i];
	259	if (memcmp(session->sess_id.data,
	260	rclist->rcl_sessionid.data,
	261	NFS4_MAX_SESSIONID_LEN) != 0)
	262	continue;
	263
	264	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	265	ref = &rclist->rcl_refcalls[j];
	266
	267	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	268	"slotid %u\n", __func__,
	269	((u32 *)&rclist->rcl_sessionid.data)[0],
	270	((u32 *)&rclist->rcl_sessionid.data)[1],
	271	((u32 *)&rclist->rcl_sessionid.data)[2],
	272	((u32 *)&rclist->rcl_sessionid.data)[3],
	273	ref->rc_sequenceid, ref->rc_slotid);
	274
	275	spin_lock(&tbl->slot_tbl_lock);
	276	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	277	tbl->slots[ref->rc_slotid].seq_nr ==
	278	ref->rc_sequenceid);
	279	spin_unlock(&tbl->slot_tbl_lock);
	280	if (status)
	281	goto out;
	282	}
	283	}
	284
	285	out:
	286	return status;
	287	}
	288
9733f0d9	289	__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
d49433e1 BH	290	struct cb_sequenceres *res)
d49433e1 BH	291	{
68f3f901	292	struct nfs_client *clp;
9733f0d9 AA	293	int i;
9733f0d9 AA	294	__be32 status;
d49433e1	295
68f3f901 RL	296	status = htonl(NFS4ERR_BADSESSION);
	297	clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
	298	if (clp == NULL)
	299	goto out;
	300
b2f28bd7	301	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
68f3f901 RL	302	if (status)
	303	goto out_putclient;
	304
72ce2b3c MS	305	/*
	306	* Check for pending referring calls. If a match is found, a
	307	* related callback was received before the response to the original
	308	* call.
	309	*/
	310	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	311	status = htonl(NFS4ERR_DELAY);
	312	goto out_putclient;
	313	}
	314
d49433e1 BH	315	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	316	sizeof(res->csr_sessionid));
	317	res->csr_sequenceid = args->csa_sequenceid;
	318	res->csr_slotid = args->csa_slotid;
	319	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	320	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	321
68f3f901 RL	322	out_putclient:
	323	nfs_put_client(clp);
	324	out:
72ce2b3c MS	325	for (i = 0; i < args->csa_nrclists; i++)
	326	kfree(args->csa_rclists[i].rcl_refcalls);
	327	kfree(args->csa_rclists);
	328
4911096f AA	329	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
	330	res->csr_status = 0;
	331	else
	332	res->csr_status = status;
	333	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	334	ntohl(status), ntohl(res->csr_status));
	335	return status;
d49433e1 BH	336	}
d49433e1 BH	337
9733f0d9	338	__be32 nfs4_callback_recallany(struct cb_recallanyargs args, void dummy)
31f09607 AB	339	{
31f09607 AB	340	struct nfs_client *clp;
9733f0d9	341	__be32 status;
31f09607 AB	342	fmode_t flags = 0;
	343
	344	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	345	clp = nfs_find_client(args->craa_addr, 4);
	346	if (clp == NULL)
	347	goto out;
	348
	349	dprintk("NFS: RECALL_ANY callback request from %s\n",
	350	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	351
	352	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	353	&args->craa_type_mask))
	354	flags = FMODE_READ;
	355	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	356	&args->craa_type_mask))
	357	flags \|= FMODE_WRITE;
	358
	359	if (flags)
	360	nfs_expire_all_delegation_types(clp, flags);
	361	status = htonl(NFS4_OK);
	362	out:
	363	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	364	return status;
	365	}
b9efa1b2 AA	366
b9efa1b2 AA	367	/* Reduce the fore channel's max_slots to the target value */
9733f0d9	368	__be32 nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy)
b9efa1b2 AA	369	{
	370	struct nfs_client *clp;
	371	struct nfs4_slot_table *fc_tbl;
9733f0d9	372	__be32 status;
b9efa1b2 AA	373
	374	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	375	clp = nfs_find_client(args->crsa_addr, 4);
	376	if (clp == NULL)
	377	goto out;
	378
	379	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
	380	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
	381	args->crsa_target_max_slots);
	382
	383	fc_tbl = &clp->cl_session->fc_slot_table;
	384
	385	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	386	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	387	args->crsa_target_max_slots < 1)
bae0ac0e AA	388	goto out_putclient;
	389
	390	status = htonl(NFS4_OK);
	391	if (args->crsa_target_max_slots == fc_tbl->max_slots)
	392	goto out_putclient;
b9efa1b2 AA	393
	394	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	395	nfs41_handle_recall_slot(clp);
bae0ac0e	396	out_putclient:
b9efa1b2 AA	397	nfs_put_client(clp); /* balance nfs_find_client */
	398	out:
	399	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	400	return status;
	401	}
d49433e1	402	#endif /* CONFIG_NFS_V4_1 */