1/*
   2 *  Server-side procedures for NFSv4.
   3 *
   4 *  Copyright (c) 2002 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson   <andros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35#include <linux/file.h>
  36#include <linux/falloc.h>
  37#include <linux/slab.h>
  38
  39#include "idmap.h"
  40#include "cache.h"
  41#include "xdr4.h"
  42#include "vfs.h"
  43#include "current_stateid.h"
  44#include "netns.h"
  45#include "acl.h"
  46#include "pnfs.h"
  47#include "trace.h"
  48
  49#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  50#include <linux/security.h>
  51
  52static inline void
  53nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  54{
  55	struct inode *inode = d_inode(resfh->fh_dentry);
  56	int status;
  57
  58	inode_lock(inode);
  59	status = security_inode_setsecctx(resfh->fh_dentry,
  60		label->data, label->len);
  61	inode_unlock(inode);
  62
  63	if (status)
  64		/*
  65		 * XXX: We should really fail the whole open, but we may
  66		 * already have created a new file, so it may be too
  67		 * late.  For now this seems the least of evils:
  68		 */
  69		bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  70
  71	return;
  72}
  73#else
  74static inline void
  75nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  76{ }
  77#endif
  78
  79#define NFSDDBG_FACILITY		NFSDDBG_PROC
  80
  81static u32 nfsd_attrmask[] = {
  82	NFSD_WRITEABLE_ATTRS_WORD0,
  83	NFSD_WRITEABLE_ATTRS_WORD1,
  84	NFSD_WRITEABLE_ATTRS_WORD2
  85};
  86
  87static u32 nfsd41_ex_attrmask[] = {
  88	NFSD_SUPPATTR_EXCLCREAT_WORD0,
  89	NFSD_SUPPATTR_EXCLCREAT_WORD1,
  90	NFSD_SUPPATTR_EXCLCREAT_WORD2
  91};
  92
  93static __be32
  94check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  95		   u32 *bmval, u32 *writable)
  96{
  97	struct dentry *dentry = cstate->current_fh.fh_dentry;
  98
  99	/*
 100	 * Check about attributes are supported by the NFSv4 server or not.
 101	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 102	 */
 103	if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 104	    (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 105	    (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 106		return nfserr_attrnotsupp;
 107
 108	/*
 109	 * Check FATTR4_WORD0_ACL can be supported
 110	 * in current environment or not.
 111	 */
 112	if (bmval[0] & FATTR4_WORD0_ACL) {
 113		if (!IS_POSIXACL(d_inode(dentry)))
 114			return nfserr_attrnotsupp;
 115	}
 116
 117	/*
 118	 * According to spec, read-only attributes return ERR_INVAL.
 119	 */
 120	if (writable) {
 121		if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 122		    (bmval[2] & ~writable[2]))
 123			return nfserr_inval;
 124	}
 125
 126	return nfs_ok;
 127}
 128
 129static __be32
 130nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 131	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 132{
 133	__be32 status = nfs_ok;
 134
 135	if (open->op_create == NFS4_OPEN_CREATE) {
 136		if (open->op_createmode == NFS4_CREATE_UNCHECKED
 137		    || open->op_createmode == NFS4_CREATE_GUARDED)
 138			status = check_attr_support(rqstp, cstate,
 139					open->op_bmval, nfsd_attrmask);
 140		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 141			status = check_attr_support(rqstp, cstate,
 142					open->op_bmval, nfsd41_ex_attrmask);
 143	}
 144
 145	return status;
 146}
 147
 148static int
 149is_create_with_attrs(struct nfsd4_open *open)
 150{
 151	return open->op_create == NFS4_OPEN_CREATE
 152		&& (open->op_createmode == NFS4_CREATE_UNCHECKED
 153		    || open->op_createmode == NFS4_CREATE_GUARDED
 154		    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 155}
 156
 157/*
 158 * if error occurs when setting the acl, just clear the acl bit
 159 * in the returned attr bitmap.
 160 */
 161static void
 162do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 163		struct nfs4_acl *acl, u32 *bmval)
 164{
 165	__be32 status;
 166
 167	status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 168	if (status)
 169		/*
 170		 * We should probably fail the whole open at this point,
 171		 * but we've already created the file, so it's too late;
 172		 * So this seems the least of evils:
 173		 */
 174		bmval[0] &= ~FATTR4_WORD0_ACL;
 175}
 176
 177static inline void
 178fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 179{
 180	fh_put(dst);
 181	dget(src->fh_dentry);
 182	if (src->fh_export)
 183		exp_get(src->fh_export);
 184	*dst = *src;
 185}
 186
 187static __be32
 188do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 189{
 190	__be32 status;
 191
 192	if (open->op_truncate &&
 193		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 194		return nfserr_inval;
 195
 196	accmode |= NFSD_MAY_READ_IF_EXEC;
 197
 198	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 199		accmode |= NFSD_MAY_READ;
 200	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 201		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 202	if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 203		accmode |= NFSD_MAY_WRITE;
 204
 205	status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 206
 207	return status;
 208}
 209
 210static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 211{
 212	umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 213
 214	if (S_ISREG(mode))
 215		return nfs_ok;
 216	if (S_ISDIR(mode))
 217		return nfserr_isdir;
 218	/*
 219	 * Using err_symlink as our catch-all case may look odd; but
 220	 * there's no other obvious error for this case in 4.0, and we
 221	 * happen to know that it will cause the linux v4 client to do
 222	 * the right thing on attempts to open something other than a
 223	 * regular file.
 224	 */
 225	return nfserr_symlink;
 226}
 227
 228static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 229{
 230	if (nfsd4_has_session(cstate))
 231		return;
 232	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 233			&resfh->fh_handle);
 234}
 235
 236static __be32
 237do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 238{
 239	struct svc_fh *current_fh = &cstate->current_fh;
 240	int accmode;
 241	__be32 status;
 242
 243	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 244	if (!*resfh)
 245		return nfserr_jukebox;
 246	fh_init(*resfh, NFS4_FHSIZE);
 247	open->op_truncate = 0;
 248
 249	if (open->op_create) {
 250		/* FIXME: check session persistence and pnfs flags.
 251		 * The nfsv4.1 spec requires the following semantics:
 252		 *
 253		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 254		 * Reply Cache  | server |                 |
 255		 * -------------+--------+-----------------+--------------------
 256		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 257		 *              |        |                 | (SHOULD)
 258		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 259		 *              |        |                 | (SHOULD NOT)
 260		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 261		 * yes          | no     | GUARDED4        | GUARDED4
 262		 * yes          | yes    | GUARDED4        | GUARDED4
 263		 */
 264
 265		/*
 266		 * Note: create modes (UNCHECKED,GUARDED...) are the same
 267		 * in NFSv4 as in v3 except EXCLUSIVE4_1.
 268		 */
 269		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 270					open->op_fname.len, &open->op_iattr,
 271					*resfh, open->op_createmode,
 272					(u32 *)open->op_verf.data,
 273					&open->op_truncate, &open->op_created);
 274
 275		if (!status && open->op_label.len)
 276			nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 277
 278		/*
 279		 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 280		 * use the returned bitmask to indicate which attributes
 281		 * we used to store the verifier:
 282		 */
 283		if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 284			open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 285						FATTR4_WORD1_TIME_MODIFY);
 286	} else
 287		/*
 288		 * Note this may exit with the parent still locked.
 289		 * We will hold the lock until nfsd4_open's final
 290		 * lookup, to prevent renames or unlinks until we've had
 291		 * a chance to an acquire a delegation if appropriate.
 292		 */
 
 
 
 
 293		status = nfsd_lookup(rqstp, current_fh,
 294				     open->op_fname.data, open->op_fname.len, *resfh);
 
 
 295	if (status)
 296		goto out;
 297	status = nfsd_check_obj_isreg(*resfh);
 298	if (status)
 299		goto out;
 300
 301	if (is_create_with_attrs(open) && open->op_acl != NULL)
 302		do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 303
 304	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 305	accmode = NFSD_MAY_NOP;
 306	if (open->op_created ||
 307			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 308		accmode |= NFSD_MAY_OWNER_OVERRIDE;
 309	status = do_open_permission(rqstp, *resfh, open, accmode);
 310	set_change_info(&open->op_cinfo, current_fh);
 
 311out:
 
 
 312	return status;
 313}
 314
 315static __be32
 316do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 317{
 318	struct svc_fh *current_fh = &cstate->current_fh;
 319	__be32 status;
 320	int accmode = 0;
 321
 322	/* We don't know the target directory, and therefore can not
 323	* set the change info
 324	*/
 325
 326	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 327
 328	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 
 
 329
 330	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 331		(open->op_iattr.ia_size == 0);
 332	/*
 333	 * In the delegation case, the client is telling us about an
 334	 * open that it *already* performed locally, some time ago.  We
 335	 * should let it succeed now if possible.
 336	 *
 337	 * In the case of a CLAIM_FH open, on the other hand, the client
 338	 * may be counting on us to enforce permissions (the Linux 4.1
 339	 * client uses this for normal opens, for example).
 340	 */
 341	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 342		accmode = NFSD_MAY_OWNER_OVERRIDE;
 343
 344	status = do_open_permission(rqstp, current_fh, open, accmode);
 
 345
 346	return status;
 347}
 348
 349static void
 350copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 351{
 352	struct nfsd4_sessionid *sid =
 353			(struct nfsd4_sessionid *)session->se_sessionid.data;
 354
 355	clid->cl_boot = sid->clientid.cl_boot;
 356	clid->cl_id = sid->clientid.cl_id;
 357}
 358
 359static __be32
 360nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 361	   struct nfsd4_open *open)
 362{
 363	__be32 status;
 364	struct svc_fh *resfh = NULL;
 365	struct net *net = SVC_NET(rqstp);
 366	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 367
 368	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 369		(int)open->op_fname.len, open->op_fname.data,
 370		open->op_openowner);
 371
 372	/* This check required by spec. */
 373	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 374		return nfserr_inval;
 375
 376	open->op_created = 0;
 377	/*
 378	 * RFC5661 18.51.3
 379	 * Before RECLAIM_COMPLETE done, server should deny new lock
 380	 */
 381	if (nfsd4_has_session(cstate) &&
 382	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 383		      &cstate->session->se_client->cl_flags) &&
 384	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 385		return nfserr_grace;
 386
 387	if (nfsd4_has_session(cstate))
 388		copy_clientid(&open->op_clientid, cstate->session);
 389
 
 
 390	/* check seqid for replay. set nfs4_owner */
 391	status = nfsd4_process_open1(cstate, open, nn);
 
 392	if (status == nfserr_replay_me) {
 393		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 394		fh_put(&cstate->current_fh);
 395		fh_copy_shallow(&cstate->current_fh.fh_handle,
 396				&rp->rp_openfh);
 397		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 398		if (status)
 399			dprintk("nfsd4_open: replay failed"
 400				" restoring previous filehandle\n");
 401		else
 402			status = nfserr_replay_me;
 403	}
 404	if (status)
 405		goto out;
 406	if (open->op_xdr_error) {
 407		status = open->op_xdr_error;
 408		goto out;
 409	}
 410
 411	status = nfsd4_check_open_attributes(rqstp, cstate, open);
 412	if (status)
 413		goto out;
 414
 415	/* Openowner is now set, so sequence id will get bumped.  Now we need
 416	 * these checks before we do any creates: */
 417	status = nfserr_grace;
 418	if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419		goto out;
 420	status = nfserr_no_grace;
 421	if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 422		goto out;
 423
 424	switch (open->op_claim_type) {
 425		case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 426		case NFS4_OPEN_CLAIM_NULL:
 427			status = do_open_lookup(rqstp, cstate, open, &resfh);
 
 428			if (status)
 429				goto out;
 430			break;
 431		case NFS4_OPEN_CLAIM_PREVIOUS:
 432			status = nfs4_check_open_reclaim(&open->op_clientid,
 433							 cstate, nn);
 434			if (status)
 435				goto out;
 436			open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 437		case NFS4_OPEN_CLAIM_FH:
 438		case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439			status = do_open_fhandle(rqstp, cstate, open);
 
 440			if (status)
 441				goto out;
 442			resfh = &cstate->current_fh;
 443			break;
 444		case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445             	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 
 446			dprintk("NFSD: unsupported OPEN claim type %d\n",
 447				open->op_claim_type);
 448			status = nfserr_notsupp;
 449			goto out;
 450		default:
 451			dprintk("NFSD: Invalid OPEN claim type %d\n",
 452				open->op_claim_type);
 453			status = nfserr_inval;
 454			goto out;
 455	}
 456	/*
 457	 * nfsd4_process_open2() does the actual opening of the file.  If
 458	 * successful, it (1) truncates the file if open->op_truncate was
 459	 * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460	 */
 461	status = nfsd4_process_open2(rqstp, resfh, open);
 462	WARN(status && open->op_created,
 463	     "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 464	     be32_to_cpu(status));
 465out:
 466	if (resfh && resfh != &cstate->current_fh) {
 467		fh_dup2(&cstate->current_fh, resfh);
 468		fh_put(resfh);
 469		kfree(resfh);
 470	}
 471	nfsd4_cleanup_open_state(cstate, open);
 472	nfsd4_bump_seqid(cstate, status);
 473	return status;
 474}
 475
 476/*
 477 * OPEN is the only seqid-mutating operation whose decoding can fail
 478 * with a seqid-mutating error (specifically, decoding of user names in
 479 * the attributes).  Therefore we have to do some processing to look up
 480 * the stateowner so that we can bump the seqid.
 481 */
 482static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 483{
 484	struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 485
 486	if (!seqid_mutating_err(ntohl(op->status)))
 487		return op->status;
 488	if (nfsd4_has_session(cstate))
 489		return op->status;
 490	open->op_xdr_error = op->status;
 491	return nfsd4_open(rqstp, cstate, open);
 492}
 493
 494/*
 495 * filehandle-manipulating ops.
 496 */
 497static __be32
 498nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499	    struct svc_fh **getfh)
 500{
 501	if (!cstate->current_fh.fh_dentry)
 502		return nfserr_nofilehandle;
 503
 504	*getfh = &cstate->current_fh;
 505	return nfs_ok;
 506}
 507
 508static __be32
 509nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510	    struct nfsd4_putfh *putfh)
 511{
 512	fh_put(&cstate->current_fh);
 513	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 514	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 515	       putfh->pf_fhlen);
 516	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 517}
 518
 519static __be32
 520nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521		void *arg)
 522{
 523	__be32 status;
 524
 525	fh_put(&cstate->current_fh);
 526	status = exp_pseudoroot(rqstp, &cstate->current_fh);
 527	return status;
 528}
 529
 530static __be32
 531nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 532		void *arg)
 533{
 534	if (!cstate->save_fh.fh_dentry)
 535		return nfserr_restorefh;
 536
 537	fh_dup2(&cstate->current_fh, &cstate->save_fh);
 538	if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 539		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 540		SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 541	}
 542	return nfs_ok;
 543}
 544
 545static __be32
 546nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 547	     void *arg)
 548{
 549	if (!cstate->current_fh.fh_dentry)
 550		return nfserr_nofilehandle;
 551
 552	fh_dup2(&cstate->save_fh, &cstate->current_fh);
 553	if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 554		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 555		SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 556	}
 557	return nfs_ok;
 558}
 559
 560/*
 561 * misc nfsv4 ops
 562 */
 563static __be32
 564nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565	     struct nfsd4_access *access)
 566{
 567	if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 568		return nfserr_inval;
 569
 570	access->ac_resp_access = access->ac_req_access;
 571	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 572			   &access->ac_supported);
 573}
 574
 575static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 576{
 577	__be32 verf[2];
 578	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 579
 580	/*
 581	 * This is opaque to client, so no need to byte-swap. Use
 582	 * __force to keep sparse happy
 583	 */
 584	verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 585	verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 586	memcpy(verifier->data, verf, sizeof(verifier->data));
 587}
 588
 589static __be32
 590nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591	     struct nfsd4_commit *commit)
 592{
 593	gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594	return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595			     commit->co_count);
 596}
 597
 598static __be32
 599nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600	     struct nfsd4_create *create)
 601{
 602	struct svc_fh resfh;
 603	__be32 status;
 604	dev_t rdev;
 605
 606	fh_init(&resfh, NFS4_FHSIZE);
 607
 608	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 609			   NFSD_MAY_CREATE);
 610	if (status)
 611		return status;
 612
 613	status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614				    nfsd_attrmask);
 615	if (status)
 616		return status;
 617
 618	switch (create->cr_type) {
 619	case NF4LNK:
 
 
 
 
 
 
 
 
 
 620		status = nfsd_symlink(rqstp, &cstate->current_fh,
 621				      create->cr_name, create->cr_namelen,
 622				      create->cr_data, &resfh);
 
 623		break;
 624
 625	case NF4BLK:
 626		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 627		if (MAJOR(rdev) != create->cr_specdata1 ||
 628		    MINOR(rdev) != create->cr_specdata2)
 629			return nfserr_inval;
 630		status = nfsd_create(rqstp, &cstate->current_fh,
 631				     create->cr_name, create->cr_namelen,
 632				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
 633		break;
 634
 635	case NF4CHR:
 636		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 637		if (MAJOR(rdev) != create->cr_specdata1 ||
 638		    MINOR(rdev) != create->cr_specdata2)
 639			return nfserr_inval;
 640		status = nfsd_create(rqstp, &cstate->current_fh,
 641				     create->cr_name, create->cr_namelen,
 642				     &create->cr_iattr,S_IFCHR, rdev, &resfh);
 643		break;
 644
 645	case NF4SOCK:
 646		status = nfsd_create(rqstp, &cstate->current_fh,
 647				     create->cr_name, create->cr_namelen,
 648				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
 649		break;
 650
 651	case NF4FIFO:
 652		status = nfsd_create(rqstp, &cstate->current_fh,
 653				     create->cr_name, create->cr_namelen,
 654				     &create->cr_iattr, S_IFIFO, 0, &resfh);
 655		break;
 656
 657	case NF4DIR:
 658		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 659		status = nfsd_create(rqstp, &cstate->current_fh,
 660				     create->cr_name, create->cr_namelen,
 661				     &create->cr_iattr, S_IFDIR, 0, &resfh);
 662		break;
 663
 664	default:
 665		status = nfserr_badtype;
 666	}
 667
 668	if (status)
 669		goto out;
 670
 671	if (create->cr_label.len)
 672		nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 673
 674	if (create->cr_acl != NULL)
 675		do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 676				create->cr_bmval);
 677
 678	fh_unlock(&cstate->current_fh);
 679	set_change_info(&create->cr_cinfo, &cstate->current_fh);
 680	fh_dup2(&cstate->current_fh, &resfh);
 681out:
 682	fh_put(&resfh);
 683	return status;
 684}
 685
 686static __be32
 687nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 688	      struct nfsd4_getattr *getattr)
 689{
 690	__be32 status;
 691
 692	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 693	if (status)
 694		return status;
 695
 696	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 697		return nfserr_inval;
 698
 699	getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 700	getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 701	getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 702
 703	getattr->ga_fhp = &cstate->current_fh;
 704	return nfs_ok;
 705}
 706
 707static __be32
 708nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 709	   struct nfsd4_link *link)
 710{
 711	__be32 status = nfserr_nofilehandle;
 712
 713	if (!cstate->save_fh.fh_dentry)
 714		return status;
 715	status = nfsd_link(rqstp, &cstate->current_fh,
 716			   link->li_name, link->li_namelen, &cstate->save_fh);
 717	if (!status)
 718		set_change_info(&link->li_cinfo, &cstate->current_fh);
 719	return status;
 720}
 721
 722static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 723{
 724	struct svc_fh tmp_fh;
 725	__be32 ret;
 726
 727	fh_init(&tmp_fh, NFS4_FHSIZE);
 728	ret = exp_pseudoroot(rqstp, &tmp_fh);
 729	if (ret)
 730		return ret;
 731	if (tmp_fh.fh_dentry == fh->fh_dentry) {
 732		fh_put(&tmp_fh);
 733		return nfserr_noent;
 734	}
 735	fh_put(&tmp_fh);
 736	return nfsd_lookup(rqstp, fh, "..", 2, fh);
 737}
 738
 739static __be32
 740nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 741	      void *arg)
 742{
 743	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 744}
 745
 746static __be32
 747nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 748	     struct nfsd4_lookup *lookup)
 749{
 750	return nfsd_lookup(rqstp, &cstate->current_fh,
 751			   lookup->lo_name, lookup->lo_len,
 752			   &cstate->current_fh);
 753}
 754
 755static __be32
 756nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 757	   struct nfsd4_read *read)
 758{
 759	__be32 status;
 760
 
 
 761	read->rd_filp = NULL;
 762	if (read->rd_offset >= OFFSET_MAX)
 763		return nfserr_inval;
 764
 765	/*
 766	 * If we do a zero copy read, then a client will see read data
 767	 * that reflects the state of the file *after* performing the
 768	 * following compound.
 769	 *
 770	 * To ensure proper ordering, we therefore turn off zero copy if
 771	 * the client wants us to do more in this compound:
 772	 */
 773	if (!nfsd4_last_compound_op(rqstp))
 774		clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 775
 776	/* check stateid */
 777	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 778					&read->rd_stateid, RD_STATE,
 779					&read->rd_filp, &read->rd_tmp_file);
 780	if (status) {
 781		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 782		goto out;
 783	}
 
 
 784	status = nfs_ok;
 785out:
 
 786	read->rd_rqstp = rqstp;
 787	read->rd_fhp = &cstate->current_fh;
 788	return status;
 789}
 790
 791static __be32
 792nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 793	      struct nfsd4_readdir *readdir)
 794{
 795	u64 cookie = readdir->rd_cookie;
 796	static const nfs4_verifier zeroverf;
 797
 798	/* no need to check permission - this will be done in nfsd_readdir() */
 799
 800	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 801		return nfserr_inval;
 802
 803	readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 804	readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 805	readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 806
 807	if ((cookie == 1) || (cookie == 2) ||
 808	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 809		return nfserr_bad_cookie;
 810
 811	readdir->rd_rqstp = rqstp;
 812	readdir->rd_fhp = &cstate->current_fh;
 813	return nfs_ok;
 814}
 815
 816static __be32
 817nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 818	       struct nfsd4_readlink *readlink)
 819{
 820	readlink->rl_rqstp = rqstp;
 821	readlink->rl_fhp = &cstate->current_fh;
 822	return nfs_ok;
 823}
 824
 825static __be32
 826nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 827	     struct nfsd4_remove *remove)
 828{
 829	__be32 status;
 830
 831	if (opens_in_grace(SVC_NET(rqstp)))
 832		return nfserr_grace;
 833	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 834			     remove->rm_name, remove->rm_namelen);
 835	if (!status) {
 836		fh_unlock(&cstate->current_fh);
 837		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 838	}
 839	return status;
 840}
 841
 842static __be32
 843nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 844	     struct nfsd4_rename *rename)
 845{
 846	__be32 status = nfserr_nofilehandle;
 847
 848	if (!cstate->save_fh.fh_dentry)
 849		return status;
 850	if (opens_in_grace(SVC_NET(rqstp)) &&
 851		!(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 852		return nfserr_grace;
 853	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 854			     rename->rn_snamelen, &cstate->current_fh,
 855			     rename->rn_tname, rename->rn_tnamelen);
 856	if (status)
 857		return status;
 858	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 859	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 860	return nfs_ok;
 
 
 
 
 
 
 
 
 
 
 861}
 862
 863static __be32
 864nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 865	      struct nfsd4_secinfo *secinfo)
 866{
 
 867	struct svc_export *exp;
 868	struct dentry *dentry;
 869	__be32 err;
 870
 
 871	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 872	if (err)
 873		return err;
 874	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 875				    secinfo->si_name, secinfo->si_namelen,
 876				    &exp, &dentry);
 877	if (err)
 878		return err;
 879	fh_unlock(&cstate->current_fh);
 880	if (d_really_is_negative(dentry)) {
 881		exp_put(exp);
 882		err = nfserr_noent;
 883	} else
 884		secinfo->si_exp = exp;
 885	dput(dentry);
 886	if (cstate->minorversion)
 887		/* See rfc 5661 section 2.6.3.1.1.8 */
 888		fh_put(&cstate->current_fh);
 889	return err;
 890}
 891
 892static __be32
 893nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 894	      struct nfsd4_secinfo_no_name *sin)
 895{
 896	__be32 err;
 897
 898	switch (sin->sin_style) {
 899	case NFS4_SECINFO_STYLE4_CURRENT_FH:
 900		break;
 901	case NFS4_SECINFO_STYLE4_PARENT:
 902		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 903		if (err)
 904			return err;
 905		break;
 906	default:
 907		return nfserr_inval;
 908	}
 909
 910	sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 911	fh_put(&cstate->current_fh);
 912	return nfs_ok;
 913}
 914
 915static __be32
 916nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 917	      struct nfsd4_setattr *setattr)
 918{
 919	__be32 status = nfs_ok;
 920	int err;
 921
 922	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 923		status = nfs4_preprocess_stateid_op(rqstp, cstate,
 924				&cstate->current_fh, &setattr->sa_stateid,
 925				WR_STATE, NULL, NULL);
 
 926		if (status) {
 927			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 928			return status;
 929		}
 930	}
 931	err = fh_want_write(&cstate->current_fh);
 932	if (err)
 933		return nfserrno(err);
 934	status = nfs_ok;
 935
 936	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 937				    nfsd_attrmask);
 938	if (status)
 939		goto out;
 940
 941	if (setattr->sa_acl != NULL)
 942		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 943					    setattr->sa_acl);
 944	if (status)
 945		goto out;
 946	if (setattr->sa_label.len)
 947		status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 948				&setattr->sa_label);
 949	if (status)
 950		goto out;
 951	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 952				0, (time_t)0);
 953out:
 954	fh_drop_write(&cstate->current_fh);
 955	return status;
 956}
 957
 958static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 959{
 960        int i = 1;
 961        int buflen = write->wr_buflen;
 962
 963        vec[0].iov_base = write->wr_head.iov_base;
 964        vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 965        buflen -= vec[0].iov_len;
 966
 967        while (buflen) {
 968                vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 969                vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 970                buflen -= vec[i].iov_len;
 971                i++;
 972        }
 973        return i;
 974}
 975
 976static __be32
 977nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 978	    struct nfsd4_write *write)
 979{
 980	stateid_t *stateid = &write->wr_stateid;
 981	struct file *filp = NULL;
 982	__be32 status = nfs_ok;
 983	unsigned long cnt;
 984	int nvecs;
 
 985
 986	if (write->wr_offset >= OFFSET_MAX)
 987		return nfserr_inval;
 988
 989	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 990						stateid, WR_STATE, &filp, NULL);
 
 
 
 
 991	if (status) {
 992		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 993		return status;
 994	}
 995
 996	cnt = write->wr_buflen;
 997	write->wr_how_written = write->wr_stable_how;
 998	gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 999
1000	nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1001	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1002
1003	status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1004				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1005				&write->wr_how_written);
1006	fput(filp);
1007
1008	write->wr_bytes_written = cnt;
1009
1010	return status;
1011}
1012
1013static __be32
1014nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1015		struct nfsd4_clone *clone)
1016{
1017	struct file *src, *dst;
1018	__be32 status;
1019
1020	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1021					    &clone->cl_src_stateid, RD_STATE,
1022					    &src, NULL);
1023	if (status) {
1024		dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1025		goto out;
1026	}
1027
1028	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1029					    &clone->cl_dst_stateid, WR_STATE,
1030					    &dst, NULL);
1031	if (status) {
1032		dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1033		goto out_put_src;
1034	}
1035
1036	/* fix up for NFS-specific error code */
1037	if (!S_ISREG(file_inode(src)->i_mode) ||
1038	    !S_ISREG(file_inode(dst)->i_mode)) {
1039		status = nfserr_wrong_type;
1040		goto out_put_dst;
1041	}
1042
1043	status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1044			dst, clone->cl_dst_pos, clone->cl_count);
1045
1046out_put_dst:
1047	fput(dst);
1048out_put_src:
1049	fput(src);
1050out:
1051	return status;
1052}
1053
1054static __be32
1055nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1056		struct nfsd4_fallocate *fallocate, int flags)
1057{
1058	__be32 status = nfserr_notsupp;
1059	struct file *file;
1060
1061	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1062					    &fallocate->falloc_stateid,
1063					    WR_STATE, &file, NULL);
1064	if (status != nfs_ok) {
1065		dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1066		return status;
1067	}
1068
1069	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1070				     fallocate->falloc_offset,
1071				     fallocate->falloc_length,
1072				     flags);
1073	fput(file);
1074	return status;
1075}
1076
1077static __be32
1078nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1079	       struct nfsd4_fallocate *fallocate)
1080{
1081	return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1082}
1083
1084static __be32
1085nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1086		 struct nfsd4_fallocate *fallocate)
1087{
1088	return nfsd4_fallocate(rqstp, cstate, fallocate,
1089			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1090}
1091
1092static __be32
1093nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1094		struct nfsd4_seek *seek)
1095{
1096	int whence;
1097	__be32 status;
1098	struct file *file;
1099
1100	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1101					    &seek->seek_stateid,
1102					    RD_STATE, &file, NULL);
1103	if (status) {
1104		dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1105		return status;
1106	}
1107
1108	switch (seek->seek_whence) {
1109	case NFS4_CONTENT_DATA:
1110		whence = SEEK_DATA;
1111		break;
1112	case NFS4_CONTENT_HOLE:
1113		whence = SEEK_HOLE;
1114		break;
1115	default:
1116		status = nfserr_union_notsupp;
1117		goto out;
1118	}
1119
1120	/*
1121	 * Note:  This call does change file->f_pos, but nothing in NFSD
1122	 *        should ever file->f_pos.
1123	 */
1124	seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1125	if (seek->seek_pos < 0)
1126		status = nfserrno(seek->seek_pos);
1127	else if (seek->seek_pos >= i_size_read(file_inode(file)))
1128		seek->seek_eof = true;
1129
1130out:
1131	fput(file);
1132	return status;
1133}
1134
1135/* This routine never returns NFS_OK!  If there are no other errors, it
1136 * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1137 * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1138 * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1139 */
1140static __be32
1141_nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1142	     struct nfsd4_verify *verify)
1143{
1144	__be32 *buf, *p;
1145	int count;
1146	__be32 status;
1147
1148	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1149	if (status)
1150		return status;
1151
1152	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1153	if (status)
1154		return status;
1155
1156	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1157	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1158		return nfserr_inval;
1159	if (verify->ve_attrlen & 3)
1160		return nfserr_inval;
1161
1162	/* count in words:
1163	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1164	 */
1165	count = 4 + (verify->ve_attrlen >> 2);
1166	buf = kmalloc(count << 2, GFP_KERNEL);
1167	if (!buf)
1168		return nfserr_jukebox;
1169
1170	p = buf;
1171	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1172				    cstate->current_fh.fh_export,
1173				    cstate->current_fh.fh_dentry,
1174				    verify->ve_bmval,
1175				    rqstp, 0);
1176	/*
1177	 * If nfsd4_encode_fattr() ran out of space, assume that's because
1178	 * the attributes are longer (hence different) than those given:
1179	 */
1180	if (status == nfserr_resource)
1181		status = nfserr_not_same;
1182	if (status)
1183		goto out_kfree;
1184
1185	/* skip bitmap */
1186	p = buf + 1 + ntohl(buf[0]);
1187	status = nfserr_not_same;
1188	if (ntohl(*p++) != verify->ve_attrlen)
1189		goto out_kfree;
1190	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1191		status = nfserr_same;
1192
1193out_kfree:
1194	kfree(buf);
1195	return status;
1196}
1197
1198static __be32
1199nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1200	      struct nfsd4_verify *verify)
1201{
1202	__be32 status;
1203
1204	status = _nfsd4_verify(rqstp, cstate, verify);
1205	return status == nfserr_not_same ? nfs_ok : status;
1206}
1207
1208static __be32
1209nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1210	     struct nfsd4_verify *verify)
1211{
1212	__be32 status;
1213
1214	status = _nfsd4_verify(rqstp, cstate, verify);
1215	return status == nfserr_same ? nfs_ok : status;
1216}
1217
1218#ifdef CONFIG_NFSD_PNFS
1219static const struct nfsd4_layout_ops *
1220nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1221{
1222	if (!exp->ex_layout_type) {
1223		dprintk("%s: export does not support pNFS\n", __func__);
1224		return NULL;
1225	}
1226
1227	if (exp->ex_layout_type != layout_type) {
1228		dprintk("%s: layout type %d not supported\n",
1229			__func__, layout_type);
1230		return NULL;
1231	}
1232
1233	return nfsd4_layout_ops[layout_type];
1234}
1235
1236static __be32
1237nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1238		struct nfsd4_compound_state *cstate,
1239		struct nfsd4_getdeviceinfo *gdp)
1240{
1241	const struct nfsd4_layout_ops *ops;
1242	struct nfsd4_deviceid_map *map;
1243	struct svc_export *exp;
1244	__be32 nfserr;
1245
1246	dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1247	       __func__,
1248	       gdp->gd_layout_type,
1249	       gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1250	       gdp->gd_maxcount);
1251
1252	map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1253	if (!map) {
1254		dprintk("%s: couldn't find device ID to export mapping!\n",
1255			__func__);
1256		return nfserr_noent;
1257	}
1258
1259	exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1260	if (IS_ERR(exp)) {
1261		dprintk("%s: could not find device id\n", __func__);
1262		return nfserr_noent;
1263	}
1264
1265	nfserr = nfserr_layoutunavailable;
1266	ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1267	if (!ops)
1268		goto out;
1269
1270	nfserr = nfs_ok;
1271	if (gdp->gd_maxcount != 0) {
1272		nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1273					cstate->session->se_client, gdp);
1274	}
1275
1276	gdp->gd_notify_types &= ops->notify_types;
1277out:
1278	exp_put(exp);
1279	return nfserr;
1280}
1281
1282static __be32
1283nfsd4_layoutget(struct svc_rqst *rqstp,
1284		struct nfsd4_compound_state *cstate,
1285		struct nfsd4_layoutget *lgp)
1286{
1287	struct svc_fh *current_fh = &cstate->current_fh;
1288	const struct nfsd4_layout_ops *ops;
1289	struct nfs4_layout_stateid *ls;
1290	__be32 nfserr;
1291	int accmode;
1292
1293	switch (lgp->lg_seg.iomode) {
1294	case IOMODE_READ:
1295		accmode = NFSD_MAY_READ;
1296		break;
1297	case IOMODE_RW:
1298		accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1299		break;
1300	default:
1301		dprintk("%s: invalid iomode %d\n",
1302			__func__, lgp->lg_seg.iomode);
1303		nfserr = nfserr_badiomode;
1304		goto out;
1305	}
1306
1307	nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1308	if (nfserr)
1309		goto out;
1310
1311	nfserr = nfserr_layoutunavailable;
1312	ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1313	if (!ops)
1314		goto out;
1315
1316	/*
1317	 * Verify minlength and range as per RFC5661:
1318	 *  o  If loga_length is less than loga_minlength,
1319	 *     the metadata server MUST return NFS4ERR_INVAL.
1320	 *  o  If the sum of loga_offset and loga_minlength exceeds
1321	 *     NFS4_UINT64_MAX, and loga_minlength is not
1322	 *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1323	 *  o  If the sum of loga_offset and loga_length exceeds
1324	 *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1325	 *     the error NFS4ERR_INVAL MUST result.
1326	 */
1327	nfserr = nfserr_inval;
1328	if (lgp->lg_seg.length < lgp->lg_minlength ||
1329	    (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1330	     lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1331	    (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1332	     lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1333		goto out;
1334	if (lgp->lg_seg.length == 0)
1335		goto out;
1336
1337	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1338						true, lgp->lg_layout_type, &ls);
1339	if (nfserr) {
1340		trace_layout_get_lookup_fail(&lgp->lg_sid);
1341		goto out;
1342	}
1343
1344	nfserr = nfserr_recallconflict;
1345	if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1346		goto out_put_stid;
1347
1348	nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1349				     current_fh, lgp);
1350	if (nfserr)
1351		goto out_put_stid;
1352
1353	nfserr = nfsd4_insert_layout(lgp, ls);
1354
1355out_put_stid:
1356	mutex_unlock(&ls->ls_mutex);
1357	nfs4_put_stid(&ls->ls_stid);
1358out:
1359	return nfserr;
1360}
1361
1362static __be32
1363nfsd4_layoutcommit(struct svc_rqst *rqstp,
1364		struct nfsd4_compound_state *cstate,
1365		struct nfsd4_layoutcommit *lcp)
1366{
1367	const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1368	struct svc_fh *current_fh = &cstate->current_fh;
1369	const struct nfsd4_layout_ops *ops;
1370	loff_t new_size = lcp->lc_last_wr + 1;
1371	struct inode *inode;
1372	struct nfs4_layout_stateid *ls;
1373	__be32 nfserr;
1374
1375	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1376	if (nfserr)
1377		goto out;
1378
1379	nfserr = nfserr_layoutunavailable;
1380	ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1381	if (!ops)
1382		goto out;
1383	inode = d_inode(current_fh->fh_dentry);
1384
1385	nfserr = nfserr_inval;
1386	if (new_size <= seg->offset) {
1387		dprintk("pnfsd: last write before layout segment\n");
1388		goto out;
1389	}
1390	if (new_size > seg->offset + seg->length) {
1391		dprintk("pnfsd: last write beyond layout segment\n");
1392		goto out;
1393	}
1394	if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1395		dprintk("pnfsd: layoutcommit beyond EOF\n");
1396		goto out;
1397	}
1398
1399	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1400						false, lcp->lc_layout_type,
1401						&ls);
1402	if (nfserr) {
1403		trace_layout_commit_lookup_fail(&lcp->lc_sid);
1404		/* fixup error code as per RFC5661 */
1405		if (nfserr == nfserr_bad_stateid)
1406			nfserr = nfserr_badlayout;
1407		goto out;
1408	}
1409
1410	/* LAYOUTCOMMIT does not require any serialization */
1411	mutex_unlock(&ls->ls_mutex);
1412
1413	if (new_size > i_size_read(inode)) {
1414		lcp->lc_size_chg = 1;
1415		lcp->lc_newsize = new_size;
1416	} else {
1417		lcp->lc_size_chg = 0;
1418	}
1419
1420	nfserr = ops->proc_layoutcommit(inode, lcp);
1421	nfs4_put_stid(&ls->ls_stid);
1422out:
1423	return nfserr;
1424}
1425
1426static __be32
1427nfsd4_layoutreturn(struct svc_rqst *rqstp,
1428		struct nfsd4_compound_state *cstate,
1429		struct nfsd4_layoutreturn *lrp)
1430{
1431	struct svc_fh *current_fh = &cstate->current_fh;
1432	__be32 nfserr;
1433
1434	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1435	if (nfserr)
1436		goto out;
1437
1438	nfserr = nfserr_layoutunavailable;
1439	if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1440		goto out;
1441
1442	switch (lrp->lr_seg.iomode) {
1443	case IOMODE_READ:
1444	case IOMODE_RW:
1445	case IOMODE_ANY:
1446		break;
1447	default:
1448		dprintk("%s: invalid iomode %d\n", __func__,
1449			lrp->lr_seg.iomode);
1450		nfserr = nfserr_inval;
1451		goto out;
1452	}
1453
1454	switch (lrp->lr_return_type) {
1455	case RETURN_FILE:
1456		nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1457		break;
1458	case RETURN_FSID:
1459	case RETURN_ALL:
1460		nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1461		break;
1462	default:
1463		dprintk("%s: invalid return_type %d\n", __func__,
1464			lrp->lr_return_type);
1465		nfserr = nfserr_inval;
1466		break;
1467	}
1468out:
1469	return nfserr;
1470}
1471#endif /* CONFIG_NFSD_PNFS */
1472
1473/*
1474 * NULL call.
1475 */
1476static __be32
1477nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1478{
1479	return nfs_ok;
1480}
1481
1482static inline void nfsd4_increment_op_stats(u32 opnum)
1483{
1484	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1485		nfsdstats.nfs4_opcount[opnum]++;
1486}
1487
1488typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1489			      void *);
1490typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1491typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1492typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1493
1494enum nfsd4_op_flags {
1495	ALLOWED_WITHOUT_FH = 1 << 0,	/* No current filehandle required */
1496	ALLOWED_ON_ABSENT_FS = 1 << 1,	/* ops processed on absent fs */
1497	ALLOWED_AS_FIRST_OP = 1 << 2,	/* ops reqired first in compound */
1498	/* For rfc 5661 section 2.6.3.1.1: */
1499	OP_HANDLES_WRONGSEC = 1 << 3,
1500	OP_IS_PUTFH_LIKE = 1 << 4,
1501	/*
1502	 * These are the ops whose result size we estimate before
1503	 * encoding, to avoid performing an op then not being able to
1504	 * respond or cache a response.  This includes writes and setattrs
1505	 * as well as the operations usually called "nonidempotent":
1506	 */
1507	OP_MODIFIES_SOMETHING = 1 << 5,
1508	/*
1509	 * Cache compounds containing these ops in the xid-based drc:
1510	 * We use the DRC for compounds containing non-idempotent
1511	 * operations, *except* those that are 4.1-specific (since
1512	 * sessions provide their own EOS), and except for stateful
1513	 * operations other than setclientid and setclientid_confirm
1514	 * (since sequence numbers provide EOS for open, lock, etc in
1515	 * the v4.0 case).
1516	 */
1517	OP_CACHEME = 1 << 6,
1518	/*
1519	 * These are ops which clear current state id.
1520	 */
1521	OP_CLEAR_STATEID = 1 << 7,
1522};
1523
1524struct nfsd4_operation {
1525	nfsd4op_func op_func;
1526	u32 op_flags;
1527	char *op_name;
1528	/* Try to get response size before operation */
1529	nfsd4op_rsize op_rsize_bop;
1530	stateid_getter op_get_currentstateid;
1531	stateid_setter op_set_currentstateid;
1532};
1533
1534static struct nfsd4_operation nfsd4_ops[];
1535
 
1536static const char *nfsd4_op_name(unsigned opnum);
 
1537
1538/*
1539 * Enforce NFSv4.1 COMPOUND ordering rules:
1540 *
1541 * Also note, enforced elsewhere:
1542 *	- SEQUENCE other than as first op results in
1543 *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1544 *	- BIND_CONN_TO_SESSION must be the only op in its compound.
1545 *	  (Enforced in nfsd4_bind_conn_to_session().)
1546 *	- DESTROY_SESSION must be the final operation in a compound, if
1547 *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1548 *	  (Enforced in nfsd4_destroy_session().)
1549 */
1550static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1551{
1552	struct nfsd4_op *op = &args->ops[0];
1553
1554	/* These ordering requirements don't apply to NFSv4.0: */
1555	if (args->minorversion == 0)
1556		return nfs_ok;
1557	/* This is weird, but OK, not our problem: */
1558	if (args->opcnt == 0)
1559		return nfs_ok;
1560	if (op->status == nfserr_op_illegal)
1561		return nfs_ok;
1562	if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1563		return nfserr_op_not_in_session;
1564	if (op->opnum == OP_SEQUENCE)
1565		return nfs_ok;
1566	if (args->opcnt != 1)
1567		return nfserr_not_only_op;
1568	return nfs_ok;
1569}
1570
1571static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1572{
1573	return &nfsd4_ops[op->opnum];
1574}
1575
1576bool nfsd4_cache_this_op(struct nfsd4_op *op)
1577{
1578	if (op->opnum == OP_ILLEGAL)
1579		return false;
1580	return OPDESC(op)->op_flags & OP_CACHEME;
1581}
1582
1583static bool need_wrongsec_check(struct svc_rqst *rqstp)
1584{
1585	struct nfsd4_compoundres *resp = rqstp->rq_resp;
1586	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1587	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1588	struct nfsd4_op *next = &argp->ops[resp->opcnt];
1589	struct nfsd4_operation *thisd;
1590	struct nfsd4_operation *nextd;
1591
1592	thisd = OPDESC(this);
1593	/*
1594	 * Most ops check wronsec on our own; only the putfh-like ops
1595	 * have special rules.
1596	 */
1597	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1598		return false;
1599	/*
1600	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1601	 * put-filehandle operation if we're not going to use the
1602	 * result:
1603	 */
1604	if (argp->opcnt == resp->opcnt)
1605		return false;
1606	if (next->opnum == OP_ILLEGAL)
1607		return false;
1608	nextd = OPDESC(next);
1609	/*
1610	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1611	 * errors themselves as necessary; others should check for them
1612	 * now:
1613	 */
1614	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1615}
1616
1617static void svcxdr_init_encode(struct svc_rqst *rqstp,
1618			       struct nfsd4_compoundres *resp)
1619{
1620	struct xdr_stream *xdr = &resp->xdr;
1621	struct xdr_buf *buf = &rqstp->rq_res;
1622	struct kvec *head = buf->head;
1623
1624	xdr->buf = buf;
1625	xdr->iov = head;
1626	xdr->p   = head->iov_base + head->iov_len;
1627	xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1628	/* Tail and page_len should be zero at this point: */
1629	buf->len = buf->head[0].iov_len;
1630	xdr->scratch.iov_len = 0;
1631	xdr->page_ptr = buf->pages - 1;
1632	buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1633		- rqstp->rq_auth_slack;
1634}
1635
1636/*
1637 * COMPOUND call.
1638 */
1639static __be32
1640nfsd4_proc_compound(struct svc_rqst *rqstp,
1641		    struct nfsd4_compoundargs *args,
1642		    struct nfsd4_compoundres *resp)
1643{
1644	struct nfsd4_op	*op;
1645	struct nfsd4_operation *opdesc;
1646	struct nfsd4_compound_state *cstate = &resp->cstate;
1647	struct svc_fh *current_fh = &cstate->current_fh;
1648	struct svc_fh *save_fh = &cstate->save_fh;
1649	__be32		status;
1650
1651	svcxdr_init_encode(rqstp, resp);
1652	resp->tagp = resp->xdr.p;
 
 
1653	/* reserve space for: taglen, tag, and opcnt */
1654	xdr_reserve_space(&resp->xdr, 8 + args->taglen);
 
1655	resp->taglen = args->taglen;
1656	resp->tag = args->tag;
 
1657	resp->rqstp = rqstp;
1658	cstate->minorversion = args->minorversion;
1659	fh_init(current_fh, NFS4_FHSIZE);
1660	fh_init(save_fh, NFS4_FHSIZE);
 
 
1661	/*
1662	 * Don't use the deferral mechanism for NFSv4; compounds make it
1663	 * too hard to avoid non-idempotency problems.
1664	 */
1665	clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1666
1667	/*
1668	 * According to RFC3010, this takes precedence over all other errors.
1669	 */
1670	status = nfserr_minor_vers_mismatch;
1671	if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1672		goto out;
1673
1674	status = nfs41_check_op_ordering(args);
1675	if (status) {
1676		op = &args->ops[0];
1677		op->status = status;
1678		goto encode_op;
1679	}
1680
1681	while (!status && resp->opcnt < args->opcnt) {
1682		op = &args->ops[resp->opcnt++];
1683
1684		dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1685			resp->opcnt, args->opcnt, op->opnum,
1686			nfsd4_op_name(op->opnum));
1687		/*
1688		 * The XDR decode routines may have pre-set op->status;
1689		 * for example, if there is a miscellaneous XDR error
1690		 * it will be set to nfserr_bad_xdr.
1691		 */
1692		if (op->status) {
1693			if (op->opnum == OP_OPEN)
1694				op->status = nfsd4_open_omfg(rqstp, cstate, op);
 
 
 
 
 
 
 
 
 
 
1695			goto encode_op;
1696		}
1697
1698		opdesc = OPDESC(op);
1699
1700		if (!current_fh->fh_dentry) {
1701			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1702				op->status = nfserr_nofilehandle;
1703				goto encode_op;
1704			}
1705		} else if (current_fh->fh_export->ex_fslocs.migrated &&
1706			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1707			op->status = nfserr_moved;
1708			goto encode_op;
1709		}
1710
1711		fh_clear_wcc(current_fh);
1712
1713		/* If op is non-idempotent */
1714		if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1715			/*
1716			 * Don't execute this op if we couldn't encode a
1717			 * succesful reply:
1718			 */
1719			u32 plen = opdesc->op_rsize_bop(rqstp, op);
1720			/*
1721			 * Plus if there's another operation, make sure
1722			 * we'll have space to at least encode an error:
1723			 */
1724			if (resp->opcnt < args->opcnt)
1725				plen += COMPOUND_ERR_SLACK_SPACE;
1726			op->status = nfsd4_check_resp_size(resp, plen);
1727		}
1728
1729		if (op->status)
1730			goto encode_op;
1731
1732		if (opdesc->op_get_currentstateid)
1733			opdesc->op_get_currentstateid(cstate, &op->u);
1734		op->status = opdesc->op_func(rqstp, cstate, &op->u);
 
 
 
1735
1736		if (!op->status) {
1737			if (opdesc->op_set_currentstateid)
1738				opdesc->op_set_currentstateid(cstate, &op->u);
1739
1740			if (opdesc->op_flags & OP_CLEAR_STATEID)
1741				clear_current_stateid(cstate);
1742
1743			if (need_wrongsec_check(rqstp))
1744				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1745		}
1746
1747encode_op:
1748		/* Only from SEQUENCE */
1749		if (cstate->status == nfserr_replay_cache) {
1750			dprintk("%s NFS4.1 replay from cache\n", __func__);
1751			status = op->status;
1752			goto out;
1753		}
1754		if (op->status == nfserr_replay_me) {
1755			op->replay = &cstate->replay_owner->so_replay;
1756			nfsd4_encode_replay(&resp->xdr, op);
1757			status = op->status = op->replay->rp_status;
1758		} else {
1759			nfsd4_encode_operation(resp, op);
1760			status = op->status;
1761		}
1762
1763		dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1764			args->ops, args->opcnt, resp->opcnt, op->opnum,
1765			be32_to_cpu(status));
1766
1767		nfsd4_cstate_clear_replay(cstate);
 
 
 
 
 
 
 
1768		nfsd4_increment_op_stats(op->opnum);
1769	}
1770
1771	cstate->status = status;
1772	fh_put(current_fh);
1773	fh_put(save_fh);
1774	BUG_ON(cstate->replay_owner);
1775out:
1776	/* Reset deferral mechanism for RPC deferrals */
1777	set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1778	dprintk("nfsv4 compound returned %d\n", ntohl(status));
1779	return status;
1780}
1781
1782#define op_encode_hdr_size		(2)
1783#define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
1784#define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1785#define op_encode_change_info_maxsz	(5)
1786#define nfs4_fattr_bitmap_maxsz		(4)
1787
1788/* We'll fall back on returning no lockowner if run out of space: */
1789#define op_encode_lockowner_maxsz	(0)
1790#define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
1791
1792#define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
1793
1794#define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
1795#define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
1796					 op_encode_ace_maxsz)
1797
1798#define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
1799
1800static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1801{
1802	return (op_encode_hdr_size) * sizeof(__be32);
1803}
1804
1805static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1806{
1807	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1808}
1809
1810static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1811{
1812	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1813}
1814
1815static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1816{
1817	return (op_encode_hdr_size + op_encode_change_info_maxsz
1818		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1819}
1820
1821/*
1822 * Note since this is an idempotent operation we won't insist on failing
1823 * the op prematurely if the estimate is too large.  We may turn off splice
1824 * reads unnecessarily.
1825 */
1826static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1827				      struct nfsd4_op *op)
1828{
1829	u32 *bmap = op->u.getattr.ga_bmval;
1830	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1831	u32 ret = 0;
1832
1833	if (bmap0 & FATTR4_WORD0_ACL)
1834		return svc_max_payload(rqstp);
1835	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1836		return svc_max_payload(rqstp);
1837
1838	if (bmap1 & FATTR4_WORD1_OWNER) {
1839		ret += IDMAP_NAMESZ + 4;
1840		bmap1 &= ~FATTR4_WORD1_OWNER;
1841	}
1842	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1843		ret += IDMAP_NAMESZ + 4;
1844		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1845	}
1846	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1847		ret += NFS4_FHSIZE + 4;
1848		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1849	}
1850	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1851		ret += NFS4_MAXLABELLEN + 12;
1852		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1853	}
1854	/*
1855	 * Largest of remaining attributes are 16 bytes (e.g.,
1856	 * supported_attributes)
1857	 */
1858	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1859	/* bitmask, length */
1860	ret += 20;
1861	return ret;
1862}
1863
1864static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1865{
1866	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1867		* sizeof(__be32);
1868}
1869
1870static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1871{
1872	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1873		* sizeof(__be32);
1874}
1875
1876static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1877{
1878	return (op_encode_hdr_size + op_encode_stateid_maxsz
1879		+ op_encode_change_info_maxsz + 1
1880		+ nfs4_fattr_bitmap_maxsz
1881		+ op_encode_delegation_maxsz) * sizeof(__be32);
1882}
1883
1884static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1885{
1886	u32 maxcount = 0, rlen = 0;
1887
1888	maxcount = svc_max_payload(rqstp);
1889	rlen = min(op->u.read.rd_length, maxcount);
 
 
 
1890
1891	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1892}
1893
1894static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1895{
1896	u32 maxcount = 0, rlen = 0;
1897
1898	maxcount = svc_max_payload(rqstp);
1899	rlen = min(op->u.readdir.rd_maxcount, maxcount);
1900
1901	return (op_encode_hdr_size + op_encode_verifier_maxsz +
1902		XDR_QUADLEN(rlen)) * sizeof(__be32);
1903}
1904
1905static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1906{
1907	return (op_encode_hdr_size + op_encode_change_info_maxsz)
1908		* sizeof(__be32);
1909}
1910
1911static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1912{
1913	return (op_encode_hdr_size + op_encode_change_info_maxsz
1914		+ op_encode_change_info_maxsz) * sizeof(__be32);
1915}
1916
1917static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1918				       struct nfsd4_op *op)
1919{
1920	return (op_encode_hdr_size
1921		+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1922}
1923
1924static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1925{
1926	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1927}
1928
1929static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1930{
1931	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1932								sizeof(__be32);
1933}
1934
1935static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1936{
1937	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1938}
1939
1940static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1941{
1942	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1943		1 + 1 + /* eir_flags, spr_how */\
1944		4 + /* spo_must_enforce & _allow with bitmap */\
1945		2 + /*eir_server_owner.so_minor_id */\
1946		/* eir_server_owner.so_major_id<> */\
1947		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1948		/* eir_server_scope<> */\
1949		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1950		1 + /* eir_server_impl_id array length */\
1951		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1952}
1953
1954static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1955{
1956	return (op_encode_hdr_size + \
1957		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1958		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1959}
1960
1961static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1962{
1963	return (op_encode_hdr_size + \
1964		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1965		2 + /* csr_sequence, csr_flags */\
1966		op_encode_channel_attrs_maxsz + \
1967		op_encode_channel_attrs_maxsz) * sizeof(__be32);
1968}
1969
1970#ifdef CONFIG_NFSD_PNFS
1971/*
1972 * At this stage we don't really know what layout driver will handle the request,
1973 * so we need to define an arbitrary upper bound here.
1974 */
1975#define MAX_LAYOUT_SIZE		128
1976static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1977{
1978	return (op_encode_hdr_size +
1979		1 /* logr_return_on_close */ +
1980		op_encode_stateid_maxsz +
1981		1 /* nr of layouts */ +
1982		MAX_LAYOUT_SIZE) * sizeof(__be32);
1983}
1984
1985static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1986{
1987	return (op_encode_hdr_size +
1988		1 /* locr_newsize */ +
1989		2 /* ns_size */) * sizeof(__be32);
1990}
1991
1992static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1993{
1994	return (op_encode_hdr_size +
1995		1 /* lrs_stateid */ +
1996		op_encode_stateid_maxsz) * sizeof(__be32);
1997}
1998#endif /* CONFIG_NFSD_PNFS */
1999
2000static struct nfsd4_operation nfsd4_ops[] = {
2001	[OP_ACCESS] = {
2002		.op_func = (nfsd4op_func)nfsd4_access,
2003		.op_name = "OP_ACCESS",
2004	},
2005	[OP_CLOSE] = {
2006		.op_func = (nfsd4op_func)nfsd4_close,
2007		.op_flags = OP_MODIFIES_SOMETHING,
2008		.op_name = "OP_CLOSE",
2009		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2010		.op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2011		.op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2012	},
2013	[OP_COMMIT] = {
2014		.op_func = (nfsd4op_func)nfsd4_commit,
2015		.op_flags = OP_MODIFIES_SOMETHING,
2016		.op_name = "OP_COMMIT",
2017		.op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2018	},
2019	[OP_CREATE] = {
2020		.op_func = (nfsd4op_func)nfsd4_create,
2021		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2022		.op_name = "OP_CREATE",
2023		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2024	},
2025	[OP_DELEGRETURN] = {
2026		.op_func = (nfsd4op_func)nfsd4_delegreturn,
2027		.op_flags = OP_MODIFIES_SOMETHING,
2028		.op_name = "OP_DELEGRETURN",
2029		.op_rsize_bop = nfsd4_only_status_rsize,
2030		.op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2031	},
2032	[OP_GETATTR] = {
2033		.op_func = (nfsd4op_func)nfsd4_getattr,
2034		.op_flags = ALLOWED_ON_ABSENT_FS,
2035		.op_rsize_bop = nfsd4_getattr_rsize,
2036		.op_name = "OP_GETATTR",
2037	},
2038	[OP_GETFH] = {
2039		.op_func = (nfsd4op_func)nfsd4_getfh,
2040		.op_name = "OP_GETFH",
2041	},
2042	[OP_LINK] = {
2043		.op_func = (nfsd4op_func)nfsd4_link,
2044		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2045				| OP_CACHEME,
2046		.op_name = "OP_LINK",
2047		.op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2048	},
2049	[OP_LOCK] = {
2050		.op_func = (nfsd4op_func)nfsd4_lock,
2051		.op_flags = OP_MODIFIES_SOMETHING,
2052		.op_name = "OP_LOCK",
2053		.op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2054		.op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2055	},
2056	[OP_LOCKT] = {
2057		.op_func = (nfsd4op_func)nfsd4_lockt,
2058		.op_name = "OP_LOCKT",
2059	},
2060	[OP_LOCKU] = {
2061		.op_func = (nfsd4op_func)nfsd4_locku,
2062		.op_flags = OP_MODIFIES_SOMETHING,
2063		.op_name = "OP_LOCKU",
2064		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2065		.op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2066	},
2067	[OP_LOOKUP] = {
2068		.op_func = (nfsd4op_func)nfsd4_lookup,
2069		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2070		.op_name = "OP_LOOKUP",
2071	},
2072	[OP_LOOKUPP] = {
2073		.op_func = (nfsd4op_func)nfsd4_lookupp,
2074		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2075		.op_name = "OP_LOOKUPP",
2076	},
2077	[OP_NVERIFY] = {
2078		.op_func = (nfsd4op_func)nfsd4_nverify,
2079		.op_name = "OP_NVERIFY",
2080	},
2081	[OP_OPEN] = {
2082		.op_func = (nfsd4op_func)nfsd4_open,
2083		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2084		.op_name = "OP_OPEN",
2085		.op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2086		.op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2087	},
2088	[OP_OPEN_CONFIRM] = {
2089		.op_func = (nfsd4op_func)nfsd4_open_confirm,
2090		.op_flags = OP_MODIFIES_SOMETHING,
2091		.op_name = "OP_OPEN_CONFIRM",
2092		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2093	},
2094	[OP_OPEN_DOWNGRADE] = {
2095		.op_func = (nfsd4op_func)nfsd4_open_downgrade,
2096		.op_flags = OP_MODIFIES_SOMETHING,
2097		.op_name = "OP_OPEN_DOWNGRADE",
2098		.op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2099		.op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2100		.op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2101	},
2102	[OP_PUTFH] = {
2103		.op_func = (nfsd4op_func)nfsd4_putfh,
2104		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2105				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
 
2106		.op_name = "OP_PUTFH",
2107		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2108	},
2109	[OP_PUTPUBFH] = {
2110		.op_func = (nfsd4op_func)nfsd4_putrootfh,
2111		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2112				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
 
2113		.op_name = "OP_PUTPUBFH",
2114		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2115	},
2116	[OP_PUTROOTFH] = {
2117		.op_func = (nfsd4op_func)nfsd4_putrootfh,
2118		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2119				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
 
2120		.op_name = "OP_PUTROOTFH",
2121		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2122	},
2123	[OP_READ] = {
2124		.op_func = (nfsd4op_func)nfsd4_read,
 
2125		.op_name = "OP_READ",
2126		.op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2127		.op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2128	},
2129	[OP_READDIR] = {
2130		.op_func = (nfsd4op_func)nfsd4_readdir,
 
2131		.op_name = "OP_READDIR",
2132		.op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2133	},
2134	[OP_READLINK] = {
2135		.op_func = (nfsd4op_func)nfsd4_readlink,
2136		.op_name = "OP_READLINK",
2137	},
2138	[OP_REMOVE] = {
2139		.op_func = (nfsd4op_func)nfsd4_remove,
2140		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2141		.op_name = "OP_REMOVE",
2142		.op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2143	},
2144	[OP_RENAME] = {
2145		.op_func = (nfsd4op_func)nfsd4_rename,
2146		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2147		.op_name = "OP_RENAME",
2148		.op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2149	},
2150	[OP_RENEW] = {
2151		.op_func = (nfsd4op_func)nfsd4_renew,
2152		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2153				| OP_MODIFIES_SOMETHING,
2154		.op_name = "OP_RENEW",
2155		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2156
2157	},
2158	[OP_RESTOREFH] = {
2159		.op_func = (nfsd4op_func)nfsd4_restorefh,
2160		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2161				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2162		.op_name = "OP_RESTOREFH",
2163		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2164	},
2165	[OP_SAVEFH] = {
2166		.op_func = (nfsd4op_func)nfsd4_savefh,
2167		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2168		.op_name = "OP_SAVEFH",
2169		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2170	},
2171	[OP_SECINFO] = {
2172		.op_func = (nfsd4op_func)nfsd4_secinfo,
2173		.op_flags = OP_HANDLES_WRONGSEC,
2174		.op_name = "OP_SECINFO",
2175	},
2176	[OP_SETATTR] = {
2177		.op_func = (nfsd4op_func)nfsd4_setattr,
2178		.op_name = "OP_SETATTR",
2179		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2180		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2181		.op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2182	},
2183	[OP_SETCLIENTID] = {
2184		.op_func = (nfsd4op_func)nfsd4_setclientid,
2185		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2186				| OP_MODIFIES_SOMETHING | OP_CACHEME,
2187		.op_name = "OP_SETCLIENTID",
2188		.op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2189	},
2190	[OP_SETCLIENTID_CONFIRM] = {
2191		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2192		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2193				| OP_MODIFIES_SOMETHING | OP_CACHEME,
2194		.op_name = "OP_SETCLIENTID_CONFIRM",
2195		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2196	},
2197	[OP_VERIFY] = {
2198		.op_func = (nfsd4op_func)nfsd4_verify,
2199		.op_name = "OP_VERIFY",
2200	},
2201	[OP_WRITE] = {
2202		.op_func = (nfsd4op_func)nfsd4_write,
2203		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2204		.op_name = "OP_WRITE",
2205		.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2206		.op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2207	},
2208	[OP_RELEASE_LOCKOWNER] = {
2209		.op_func = (nfsd4op_func)nfsd4_release_lockowner,
2210		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2211				| OP_MODIFIES_SOMETHING,
2212		.op_name = "OP_RELEASE_LOCKOWNER",
2213		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2214	},
2215
2216	/* NFSv4.1 operations */
2217	[OP_EXCHANGE_ID] = {
2218		.op_func = (nfsd4op_func)nfsd4_exchange_id,
2219		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2220				| OP_MODIFIES_SOMETHING,
2221		.op_name = "OP_EXCHANGE_ID",
2222		.op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2223	},
2224	[OP_BACKCHANNEL_CTL] = {
2225		.op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2226		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2227		.op_name = "OP_BACKCHANNEL_CTL",
2228		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2229	},
2230	[OP_BIND_CONN_TO_SESSION] = {
2231		.op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2232		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2233				| OP_MODIFIES_SOMETHING,
2234		.op_name = "OP_BIND_CONN_TO_SESSION",
2235		.op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2236	},
2237	[OP_CREATE_SESSION] = {
2238		.op_func = (nfsd4op_func)nfsd4_create_session,
2239		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2240				| OP_MODIFIES_SOMETHING,
2241		.op_name = "OP_CREATE_SESSION",
2242		.op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2243	},
2244	[OP_DESTROY_SESSION] = {
2245		.op_func = (nfsd4op_func)nfsd4_destroy_session,
2246		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2247				| OP_MODIFIES_SOMETHING,
2248		.op_name = "OP_DESTROY_SESSION",
2249		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2250	},
2251	[OP_SEQUENCE] = {
2252		.op_func = (nfsd4op_func)nfsd4_sequence,
2253		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2254		.op_name = "OP_SEQUENCE",
2255		.op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2256	},
2257	[OP_DESTROY_CLIENTID] = {
2258		.op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2259		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2260				| OP_MODIFIES_SOMETHING,
2261		.op_name = "OP_DESTROY_CLIENTID",
2262		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2263	},
2264	[OP_RECLAIM_COMPLETE] = {
2265		.op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2266		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2267		.op_name = "OP_RECLAIM_COMPLETE",
2268		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2269	},
2270	[OP_SECINFO_NO_NAME] = {
2271		.op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2272		.op_flags = OP_HANDLES_WRONGSEC,
2273		.op_name = "OP_SECINFO_NO_NAME",
2274	},
2275	[OP_TEST_STATEID] = {
2276		.op_func = (nfsd4op_func)nfsd4_test_stateid,
2277		.op_flags = ALLOWED_WITHOUT_FH,
2278		.op_name = "OP_TEST_STATEID",
2279	},
2280	[OP_FREE_STATEID] = {
2281		.op_func = (nfsd4op_func)nfsd4_free_stateid,
2282		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2283		.op_name = "OP_FREE_STATEID",
2284		.op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2285		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2286	},
2287#ifdef CONFIG_NFSD_PNFS
2288	[OP_GETDEVICEINFO] = {
2289		.op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2290		.op_flags = ALLOWED_WITHOUT_FH,
2291		.op_name = "OP_GETDEVICEINFO",
2292	},
2293	[OP_LAYOUTGET] = {
2294		.op_func = (nfsd4op_func)nfsd4_layoutget,
2295		.op_flags = OP_MODIFIES_SOMETHING,
2296		.op_name = "OP_LAYOUTGET",
2297		.op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2298	},
2299	[OP_LAYOUTCOMMIT] = {
2300		.op_func = (nfsd4op_func)nfsd4_layoutcommit,
2301		.op_flags = OP_MODIFIES_SOMETHING,
2302		.op_name = "OP_LAYOUTCOMMIT",
2303		.op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2304	},
2305	[OP_LAYOUTRETURN] = {
2306		.op_func = (nfsd4op_func)nfsd4_layoutreturn,
2307		.op_flags = OP_MODIFIES_SOMETHING,
2308		.op_name = "OP_LAYOUTRETURN",
2309		.op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2310	},
2311#endif /* CONFIG_NFSD_PNFS */
2312
2313	/* NFSv4.2 operations */
2314	[OP_ALLOCATE] = {
2315		.op_func = (nfsd4op_func)nfsd4_allocate,
2316		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2317		.op_name = "OP_ALLOCATE",
2318		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2319	},
2320	[OP_DEALLOCATE] = {
2321		.op_func = (nfsd4op_func)nfsd4_deallocate,
2322		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2323		.op_name = "OP_DEALLOCATE",
2324		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2325	},
2326	[OP_CLONE] = {
2327		.op_func = (nfsd4op_func)nfsd4_clone,
2328		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2329		.op_name = "OP_CLONE",
2330		.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2331	},
2332	[OP_SEEK] = {
2333		.op_func = (nfsd4op_func)nfsd4_seek,
2334		.op_name = "OP_SEEK",
2335	},
2336};
2337
2338int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2339{
2340	struct nfsd4_operation *opdesc;
2341	nfsd4op_rsize estimator;
2342
2343	if (op->opnum == OP_ILLEGAL)
2344		return op_encode_hdr_size * sizeof(__be32);
2345	opdesc = OPDESC(op);
2346	estimator = opdesc->op_rsize_bop;
2347	return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2348}
2349
2350void warn_on_nonidempotent_op(struct nfsd4_op *op)
2351{
2352	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2353		pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2354			op->opnum, nfsd4_op_name(op->opnum));
2355		WARN_ON_ONCE(1);
2356	}
2357}
2358
2359static const char *nfsd4_op_name(unsigned opnum)
2360{
2361	if (opnum < ARRAY_SIZE(nfsd4_ops))
2362		return nfsd4_ops[opnum].op_name;
2363	return "unknown_operation";
2364}
 
2365
2366#define nfsd4_voidres			nfsd4_voidargs
2367struct nfsd4_voidargs { int dummy; };
2368
2369static struct svc_procedure		nfsd_procedures4[2] = {
2370	[NFSPROC4_NULL] = {
2371		.pc_func = (svc_procfunc) nfsd4_proc_null,
2372		.pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2373		.pc_argsize = sizeof(struct nfsd4_voidargs),
2374		.pc_ressize = sizeof(struct nfsd4_voidres),
2375		.pc_cachetype = RC_NOCACHE,
2376		.pc_xdrressize = 1,
2377	},
2378	[NFSPROC4_COMPOUND] = {
2379		.pc_func = (svc_procfunc) nfsd4_proc_compound,
2380		.pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2381		.pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2382		.pc_argsize = sizeof(struct nfsd4_compoundargs),
2383		.pc_ressize = sizeof(struct nfsd4_compoundres),
2384		.pc_release = nfsd4_release_compoundargs,
2385		.pc_cachetype = RC_NOCACHE,
2386		.pc_xdrressize = NFSD_BUFSIZE/4,
2387	},
2388};
2389
2390struct svc_version	nfsd_version4 = {
2391		.vs_vers	= 4,
2392		.vs_nproc	= 2,
2393		.vs_proc	= nfsd_procedures4,
2394		.vs_dispatch	= nfsd_dispatch,
2395		.vs_xdrsize	= NFS4_SVC_XDRSIZE,
2396		.vs_rpcb_optnl	= 1,
2397};
2398
2399/*
2400 * Local variables:
2401 *  c-basic-offset: 8
2402 * End:
2403 */