[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 <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 cb_process_state *cps)
{
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);

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

	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL)
		goto out;
	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:
	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 cb_process_state *cps)
{
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
		goto out;

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

	res = htonl(NFS4ERR_BADHANDLE);
	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	if (inode == NULL)
		goto out;
	/* 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);
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);
}

/*
 * 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 cb_process_state *cps)
{
	struct nfs_client *clp;
	int i;
	__be32 status;

	cps->clp = NULL;

	status = htonl(NFS4ERR_BADSESSION);
	/* Incoming session must match the callback session */
	if (memcmp(&args->csa_sessionid, cps->svc_sid, NFS4_MAX_SESSIONID_LEN))
		goto out;

	clp = nfs4_find_client_sessionid(args->csa_addr,
					 &args->csa_sessionid, 1);
	if (clp == NULL)
		goto out;

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

	/*
	 * 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;
	}

	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;
	cps->clp = clp; /* put in nfs4_callback_compound */

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)) {
		cps->drc_status = status;
		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 cb_process_state *cps)
{
	__be32 status;
	fmode_t flags = 0;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

	dprintk("NFS: RECALL_ANY callback request from %s\n",
		rpc_peeraddr2str(cps->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(cps->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 cb_process_state *cps)
{
	struct nfs4_slot_table *fc_tbl;
	__be32 status;

	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	if (!cps->clp) /* set in cb_sequence */
		goto out;

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

	fc_tbl = &cps->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;

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

	fc_tbl->target_max_slots = args->crsa_target_max_slots;
	nfs41_handle_recall_slot(cps->clp);
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
c36fca52 AA	19
	20	__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
	21	struct cb_getattrres *res,
	22	struct cb_process_state *cps)
1da177e4	23	{
1da177e4 LT	24	struct nfs_delegation *delegation;
	25	struct nfs_inode *nfsi;
	26	struct inode *inode;
1d98fe67	27
c36fca52 AA	28	res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
	29	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
	30	goto out;
	31
1da177e4 LT	32	res->bitmap[0] = res->bitmap[1] = 0;
1da177e4 LT	33	res->status = htonl(NFS4ERR_BADHANDLE);
1d98fe67 CL	34
1d98fe67 CL	35	dprintk("NFS: GETATTR callback request from %s\n",
c36fca52	36	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1d98fe67	37
c36fca52	38	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
1da177e4	39	if (inode == NULL)
c36fca52	40	goto out;
1da177e4	41	nfsi = NFS_I(inode);
761fe93c TM	42	rcu_read_lock();
761fe93c TM	43	delegation = rcu_dereference(nfsi->delegation);
1da177e4 LT	44	if (delegation == NULL \|\| (delegation->type & FMODE_WRITE) == 0)
	45	goto out_iput;
	46	res->size = i_size_read(inode);
beb2a5ec TM	47	res->change_attr = delegation->change_attr;
	48	if (nfsi->npages != 0)
	49	res->change_attr++;
1da177e4 LT	50	res->ctime = inode->i_ctime;
	51	res->mtime = inode->i_mtime;
	52	res->bitmap[0] = (FATTR4_WORD0_CHANGE\|FATTR4_WORD0_SIZE) &
	53	args->bitmap[0];
	54	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA\|FATTR4_WORD1_TIME_MODIFY) &
	55	args->bitmap[1];
	56	res->status = 0;
	57	out_iput:
761fe93c	58	rcu_read_unlock();
1da177e4	59	iput(inode);
1da177e4	60	out:
3110ff80	61	dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
1da177e4 LT	62	return res->status;
	63	}
	64
c36fca52 AA	65	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy,
c36fca52 AA	66	struct cb_process_state *cps)
1da177e4	67	{
1da177e4	68	struct inode *inode;
e6f684f6	69	__be32 res;
1da177e4	70
c36fca52 AA	71	res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52 AA	72	if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
1da177e4	73	goto out;
1d98fe67 CL	74
1d98fe67 CL	75	dprintk("NFS: RECALL callback request from %s\n",
c36fca52 AA	76	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	77
	78	res = htonl(NFS4ERR_BADHANDLE);
	79	inode = nfs_delegation_find_inode(cps->clp, &args->fh);
	80	if (inode == NULL)
	81	goto out;
	82	/* Set up a helper thread to actually return the delegation */
	83	switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
	84	case 0:
	85	res = 0;
	86	break;
	87	case -ENOENT:
	88	if (res != 0)
	89	res = htonl(NFS4ERR_BAD_STATEID);
	90	break;
	91	default:
	92	res = htonl(NFS4ERR_RESOURCE);
	93	}
	94	iput(inode);
1da177e4	95	out:
3110ff80	96	dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
1da177e4 LT	97	return res;
1da177e4 LT	98	}
d49433e1	99
2597641d AB	100	int nfs4_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	101	{
	102	if (delegation == NULL \|\| memcmp(delegation->stateid.data, stateid->data,
	103	sizeof(delegation->stateid.data)) != 0)
	104	return 0;
	105	return 1;
	106	}
	107
d49433e1 BH	108	#if defined(CONFIG_NFS_V4_1)
d49433e1 BH	109
2597641d AB	110	int nfs41_validate_delegation_stateid(struct nfs_delegation delegation, const nfs4_stateid stateid)
	111	{
	112	if (delegation == NULL)
	113	return 0;
	114
94499252	115	if (stateid->stateid.seqid != 0)
2597641d	116	return 0;
94499252 AB	117	if (memcmp(&delegation->stateid.stateid.other,
	118	&stateid->stateid.other,
	119	NFS4_STATEID_OTHER_SIZE))
2597641d AB	120	return 0;
	121
	122	return 1;
	123	}
	124
68f3f901 RL	125	/*
	126	* Validate the sequenceID sent by the server.
	127	* Return success if the sequenceID is one more than what we last saw on
	128	* this slot, accounting for wraparound. Increments the slot's sequence.
	129	*
4911096f AA	130	* We don't yet implement a duplicate request cache, instead we set the
4911096f AA	131	* back channel ca_maxresponsesize_cached to zero. This is OK for now
68f3f901 RL	132	* since we only currently implement idempotent callbacks anyway.
	133	*
	134	* We have a single slot backchannel at this time, so we don't bother
	135	* checking the used_slots bit array on the table. The lower layer guarantees
	136	* a single outstanding callback request at a time.
	137	*/
9733f0d9	138	static __be32
b2f28bd7	139	validate_seqid(struct nfs4_slot_table tbl, struct cb_sequenceargs args)
68f3f901 RL	140	{
	141	struct nfs4_slot *slot;
	142
	143	dprintk("%s enter. slotid %d seqid %d\n",
b2f28bd7	144	__func__, args->csa_slotid, args->csa_sequenceid);
68f3f901	145
b2f28bd7	146	if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
68f3f901 RL	147	return htonl(NFS4ERR_BADSLOT);
68f3f901 RL	148
b2f28bd7	149	slot = tbl->slots + args->csa_slotid;
68f3f901 RL	150	dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
	151
	152	/* Normal */
b2f28bd7	153	if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
68f3f901 RL	154	slot->seq_nr++;
	155	return htonl(NFS4_OK);
	156	}
	157
	158	/* Replay */
b2f28bd7	159	if (args->csa_sequenceid == slot->seq_nr) {
4911096f	160	dprintk("%s seqid %d is a replay\n",
b2f28bd7	161	__func__, args->csa_sequenceid);
4911096f AA	162	/* Signal process_op to set this error on next op */
	163	if (args->csa_cachethis == 0)
	164	return htonl(NFS4ERR_RETRY_UNCACHED_REP);
	165
	166	/* The ca_maxresponsesize_cached is 0 with no DRC */
	167	else if (args->csa_cachethis == 1)
	168	return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
68f3f901 RL	169	}
	170
	171	/* Wraparound */
b2f28bd7	172	if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
68f3f901 RL	173	slot->seq_nr = 1;
	174	return htonl(NFS4_OK);
	175	}
	176
	177	/* Misordered request */
	178	return htonl(NFS4ERR_SEQ_MISORDERED);
	179	}
	180
a7989c3e MS	181	/*
	182	* For each referring call triple, check the session's slot table for
	183	* a match. If the slot is in use and the sequence numbers match, the
	184	* client is still waiting for a response to the original request.
	185	*/
	186	static bool referring_call_exists(struct nfs_client *clp,
	187	uint32_t nrclists,
	188	struct referring_call_list *rclists)
	189	{
	190	bool status = 0;
	191	int i, j;
	192	struct nfs4_session *session;
	193	struct nfs4_slot_table *tbl;
	194	struct referring_call_list *rclist;
	195	struct referring_call *ref;
	196
	197	/*
	198	* XXX When client trunking is implemented, this becomes
	199	* a session lookup from within the loop
	200	*/
	201	session = clp->cl_session;
	202	tbl = &session->fc_slot_table;
	203
	204	for (i = 0; i < nrclists; i++) {
	205	rclist = &rclists[i];
	206	if (memcmp(session->sess_id.data,
	207	rclist->rcl_sessionid.data,
	208	NFS4_MAX_SESSIONID_LEN) != 0)
	209	continue;
	210
	211	for (j = 0; j < rclist->rcl_nrefcalls; j++) {
	212	ref = &rclist->rcl_refcalls[j];
	213
	214	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
	215	"slotid %u\n", __func__,
	216	((u32 *)&rclist->rcl_sessionid.data)[0],
	217	((u32 *)&rclist->rcl_sessionid.data)[1],
	218	((u32 *)&rclist->rcl_sessionid.data)[2],
	219	((u32 *)&rclist->rcl_sessionid.data)[3],
	220	ref->rc_sequenceid, ref->rc_slotid);
	221
	222	spin_lock(&tbl->slot_tbl_lock);
	223	status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
	224	tbl->slots[ref->rc_slotid].seq_nr ==
	225	ref->rc_sequenceid);
	226	spin_unlock(&tbl->slot_tbl_lock);
	227	if (status)
	228	goto out;
	229	}
	230	}
	231
	232	out:
	233	return status;
	234	}
	235
9733f0d9	236	__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
c36fca52 AA	237	struct cb_sequenceres *res,
c36fca52 AA	238	struct cb_process_state *cps)
d49433e1	239	{
68f3f901	240	struct nfs_client *clp;
9733f0d9 AA	241	int i;
9733f0d9 AA	242	__be32 status;
d49433e1	243
c36fca52 AA	244	cps->clp = NULL;
c36fca52 AA	245
68f3f901	246	status = htonl(NFS4ERR_BADSESSION);
c36fca52 AA	247	/* Incoming session must match the callback session */
	248	if (memcmp(&args->csa_sessionid, cps->svc_sid, NFS4_MAX_SESSIONID_LEN))
	249	goto out;
	250
	251	clp = nfs4_find_client_sessionid(args->csa_addr,
	252	&args->csa_sessionid, 1);
68f3f901 RL	253	if (clp == NULL)
	254	goto out;
	255
b2f28bd7	256	status = validate_seqid(&clp->cl_session->bc_slot_table, args);
68f3f901	257	if (status)
c36fca52	258	goto out;
68f3f901	259
72ce2b3c MS	260	/*
	261	* Check for pending referring calls. If a match is found, a
	262	* related callback was received before the response to the original
	263	* call.
	264	*/
	265	if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
	266	status = htonl(NFS4ERR_DELAY);
c36fca52	267	goto out;
72ce2b3c MS	268	}
72ce2b3c MS	269
d49433e1 BH	270	memcpy(&res->csr_sessionid, &args->csa_sessionid,
	271	sizeof(res->csr_sessionid));
	272	res->csr_sequenceid = args->csa_sequenceid;
	273	res->csr_slotid = args->csa_slotid;
	274	res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
	275	res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
c36fca52	276	cps->clp = clp; /* put in nfs4_callback_compound */
d49433e1	277
68f3f901	278	out:
72ce2b3c MS	279	for (i = 0; i < args->csa_nrclists; i++)
	280	kfree(args->csa_rclists[i].rcl_refcalls);
	281	kfree(args->csa_rclists);
	282
c36fca52 AA	283	if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
	284	cps->drc_status = status;
	285	status = 0;
	286	} else
4911096f	287	res->csr_status = status;
c36fca52	288
4911096f AA	289	dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
	290	ntohl(status), ntohl(res->csr_status));
	291	return status;
d49433e1 BH	292	}
d49433e1 BH	293
c36fca52 AA	294	__be32 nfs4_callback_recallany(struct cb_recallanyargs args, void dummy,
c36fca52 AA	295	struct cb_process_state *cps)
31f09607	296	{
9733f0d9	297	__be32 status;
31f09607 AB	298	fmode_t flags = 0;
	299
	300	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	301	if (!cps->clp) /* set in cb_sequence */
31f09607 AB	302	goto out;
	303
	304	dprintk("NFS: RECALL_ANY callback request from %s\n",
c36fca52	305	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
31f09607 AB	306
	307	if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
	308	&args->craa_type_mask))
	309	flags = FMODE_READ;
	310	if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
	311	&args->craa_type_mask))
	312	flags \|= FMODE_WRITE;
	313
	314	if (flags)
c36fca52	315	nfs_expire_all_delegation_types(cps->clp, flags);
31f09607 AB	316	status = htonl(NFS4_OK);
	317	out:
	318	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	319	return status;
	320	}
b9efa1b2 AA	321
b9efa1b2 AA	322	/* Reduce the fore channel's max_slots to the target value */
c36fca52 AA	323	__be32 nfs4_callback_recallslot(struct cb_recallslotargs args, void dummy,
c36fca52 AA	324	struct cb_process_state *cps)
b9efa1b2	325	{
b9efa1b2	326	struct nfs4_slot_table *fc_tbl;
9733f0d9	327	__be32 status;
b9efa1b2 AA	328
b9efa1b2 AA	329	status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
c36fca52	330	if (!cps->clp) /* set in cb_sequence */
b9efa1b2 AA	331	goto out;
	332
	333	dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
c36fca52	334	rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
b9efa1b2 AA	335	args->crsa_target_max_slots);
b9efa1b2 AA	336
c36fca52	337	fc_tbl = &cps->clp->cl_session->fc_slot_table;
b9efa1b2 AA	338
b9efa1b2 AA	339	status = htonl(NFS4ERR_BAD_HIGH_SLOT);
bae0ac0e	340	if (args->crsa_target_max_slots > fc_tbl->max_slots \|\|
b9efa1b2	341	args->crsa_target_max_slots < 1)
c36fca52	342	goto out;
bae0ac0e AA	343
	344	status = htonl(NFS4_OK);
	345	if (args->crsa_target_max_slots == fc_tbl->max_slots)
c36fca52	346	goto out;
b9efa1b2 AA	347
b9efa1b2 AA	348	fc_tbl->target_max_slots = args->crsa_target_max_slots;
c36fca52	349	nfs41_handle_recall_slot(cps->clp);
b9efa1b2 AA	350	out:
	351	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	352	return status;
	353	}
d49433e1	354	#endif /* CONFIG_NFS_V4_1 */