fs/nfsd/nfs4proc.c

   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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   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/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/kthread.h>
  40 #include <linux/namei.h>
  41
  42 #include <linux/sunrpc/addr.h>
  43 #include <linux/nfs_ssc.h>
  44
  45 #include "idmap.h"
  46 #include "cache.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "current_stateid.h"
  50 #include "netns.h"
  51 #include "acl.h"
  52 #include "pnfs.h"
  53 #include "trace.h"
  54
  55 static bool inter_copy_offload_enable;
  56 module_param(inter_copy_offload_enable, bool, 0644);
  57 MODULE_PARM_DESC(inter_copy_offload_enable,
  58                  "Enable inter server to server copy offload. Default: false");
  59
  60 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
  61 static int nfsd4_ssc_umount_timeout = 900000;           /* default to 15 mins */
  62 module_param(nfsd4_ssc_umount_timeout, int, 0644);
  63 MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
  64                 "idle msecs before unmount export from source server");
  65 #endif
  66
  67 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  68
  69 static u32 nfsd_attrmask[] = {
  70         NFSD_WRITEABLE_ATTRS_WORD0,
  71         NFSD_WRITEABLE_ATTRS_WORD1,
  72         NFSD_WRITEABLE_ATTRS_WORD2
  73 };
  74
  75 static u32 nfsd41_ex_attrmask[] = {
  76         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  77         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  78         NFSD_SUPPATTR_EXCLCREAT_WORD2
  79 };
  80
  81 static __be32
  82 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  83                    u32 *bmval, u32 *writable)
  84 {
  85         struct dentry *dentry = cstate->current_fh.fh_dentry;
  86         struct svc_export *exp = cstate->current_fh.fh_export;
  87
  88         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
  89                 return nfserr_attrnotsupp;
  90         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
  91                 return nfserr_attrnotsupp;
  92         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
  93                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
  94                 return nfserr_attrnotsupp;
  95         if (writable && !bmval_is_subset(bmval, writable))
  96                 return nfserr_inval;
  97         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
  98                         (bmval[1] & FATTR4_WORD1_MODE))
  99                 return nfserr_inval;
 100         return nfs_ok;
 101 }
 102
 103 static __be32
 104 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 105         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 106 {
 107         __be32 status = nfs_ok;
 108
 109         if (open->op_create == NFS4_OPEN_CREATE) {
 110                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 111                     || open->op_createmode == NFS4_CREATE_GUARDED)
 112                         status = check_attr_support(rqstp, cstate,
 113                                         open->op_bmval, nfsd_attrmask);
 114                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 115                         status = check_attr_support(rqstp, cstate,
 116                                         open->op_bmval, nfsd41_ex_attrmask);
 117         }
 118
 119         return status;
 120 }
 121
 122 static int
 123 is_create_with_attrs(struct nfsd4_open *open)
 124 {
 125         return open->op_create == NFS4_OPEN_CREATE
 126                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 127                     || open->op_createmode == NFS4_CREATE_GUARDED
 128                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 129 }
 130
 131 static inline void
 132 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 133 {
 134         fh_put(dst);
 135         dget(src->fh_dentry);
 136         if (src->fh_export)
 137                 exp_get(src->fh_export);
 138         *dst = *src;
 139 }
 140
 141 static __be32
 142 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 143 {
 144
 145         if (open->op_truncate &&
 146                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 147                 return nfserr_inval;
 148
 149         accmode |= NFSD_MAY_READ_IF_EXEC;
 150
 151         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 152                 accmode |= NFSD_MAY_READ;
 153         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 154                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 155         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 156                 accmode |= NFSD_MAY_WRITE;
 157
 158         return fh_verify(rqstp, current_fh, S_IFREG, accmode);
 159 }
 160
 161 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 162 {
 163         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 164
 165         if (S_ISREG(mode))
 166                 return nfs_ok;
 167         if (S_ISDIR(mode))
 168                 return nfserr_isdir;
 169         /*
 170          * Using err_symlink as our catch-all case may look odd; but
 171          * there's no other obvious error for this case in 4.0, and we
 172          * happen to know that it will cause the linux v4 client to do
 173          * the right thing on attempts to open something other than a
 174          * regular file.
 175          */
 176         return nfserr_symlink;
 177 }
 178
 179 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 180 {
 181         if (nfsd4_has_session(cstate))
 182                 return;
 183         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 184                         &resfh->fh_handle);
 185 }
 186
 187 static inline bool nfsd4_create_is_exclusive(int createmode)
 188 {
 189         return createmode == NFS4_CREATE_EXCLUSIVE ||
 190                 createmode == NFS4_CREATE_EXCLUSIVE4_1;
 191 }
 192
 193 static __be32
 194 nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
 195                  struct nfsd4_open *open)
 196 {
 197         struct file *filp;
 198         struct path path;
 199         int oflags;
 200
 201         oflags = O_CREAT | O_LARGEFILE;
 202         switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
 203         case NFS4_SHARE_ACCESS_WRITE:
 204                 oflags |= O_WRONLY;
 205                 break;
 206         case NFS4_SHARE_ACCESS_BOTH:
 207                 oflags |= O_RDWR;
 208                 break;
 209         default:
 210                 oflags |= O_RDONLY;
 211         }
 212
 213         path.mnt = fhp->fh_export->ex_path.mnt;
 214         path.dentry = child;
 215         filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
 216                              current_cred());
 217         if (IS_ERR(filp))
 218                 return nfserrno(PTR_ERR(filp));
 219
 220         open->op_filp = filp;
 221         return nfs_ok;
 222 }
 223
 224 /*
 225  * Implement NFSv4's unchecked, guarded, and exclusive create
 226  * semantics for regular files. Open state for this new file is
 227  * subsequently fabricated in nfsd4_process_open2().
 228  *
 229  * Upon return, caller must release @fhp and @resfhp.
 230  */
 231 static __be32
 232 nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
 233                   struct svc_fh *resfhp, struct nfsd4_open *open)
 234 {
 235         struct iattr *iap = &open->op_iattr;
 236         struct nfsd_attrs attrs = {
 237                 .na_iattr       = iap,
 238                 .na_seclabel    = &open->op_label,
 239         };
 240         struct dentry *parent, *child;
 241         __u32 v_mtime, v_atime;
 242         struct inode *inode;
 243         __be32 status;
 244         int host_err;
 245
 246         if (isdotent(open->op_fname, open->op_fnamelen))
 247                 return nfserr_exist;
 248         if (!(iap->ia_valid & ATTR_MODE))
 249                 iap->ia_mode = 0;
 250
 251         status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
 252         if (status != nfs_ok)
 253                 return status;
 254         parent = fhp->fh_dentry;
 255         inode = d_inode(parent);
 256
 257         host_err = fh_want_write(fhp);
 258         if (host_err)
 259                 return nfserrno(host_err);
 260
 261         if (is_create_with_attrs(open))
 262                 nfsd4_acl_to_attr(NF4REG, open->op_acl, &attrs);
 263
 264         inode_lock_nested(inode, I_MUTEX_PARENT);
 265
 266         child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
 267         if (IS_ERR(child)) {
 268                 status = nfserrno(PTR_ERR(child));
 269                 goto out;
 270         }
 271
 272         if (d_really_is_negative(child)) {
 273                 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
 274                 if (status != nfs_ok)
 275                         goto out;
 276         }
 277
 278         status = fh_compose(resfhp, fhp->fh_export, child, fhp);
 279         if (status != nfs_ok)
 280                 goto out;
 281
 282         v_mtime = 0;
 283         v_atime = 0;
 284         if (nfsd4_create_is_exclusive(open->op_createmode)) {
 285                 u32 *verifier = (u32 *)open->op_verf.data;
 286
 287                 /*
 288                  * Solaris 7 gets confused (bugid 4218508) if these have
 289                  * the high bit set, as do xfs filesystems without the
 290                  * "bigtime" feature. So just clear the high bits. If this
 291                  * is ever changed to use different attrs for storing the
 292                  * verifier, then do_open_lookup() will also need to be
 293                  * fixed accordingly.
 294                  */
 295                 v_mtime = verifier[0] & 0x7fffffff;
 296                 v_atime = verifier[1] & 0x7fffffff;
 297         }
 298
 299         if (d_really_is_positive(child)) {
 300                 status = nfs_ok;
 301
 302                 /* NFSv4 protocol requires change attributes even though
 303                  * no change happened.
 304                  */
 305                 fh_fill_both_attrs(fhp);
 306
 307                 switch (open->op_createmode) {
 308                 case NFS4_CREATE_UNCHECKED:
 309                         if (!d_is_reg(child))
 310                                 break;
 311
 312                         /*
 313                          * In NFSv4, we don't want to truncate the file
 314                          * now. This would be wrong if the OPEN fails for
 315                          * some other reason. Furthermore, if the size is
 316                          * nonzero, we should ignore it according to spec!
 317                          */
 318                         open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
 319                                                 !iap->ia_size;
 320                         break;
 321                 case NFS4_CREATE_GUARDED:
 322                         status = nfserr_exist;
 323                         break;
 324                 case NFS4_CREATE_EXCLUSIVE:
 325                         if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
 326                             d_inode(child)->i_atime.tv_sec == v_atime &&
 327                             d_inode(child)->i_size == 0) {
 328                                 open->op_created = true;
 329                                 break;          /* subtle */
 330                         }
 331                         status = nfserr_exist;
 332                         break;
 333                 case NFS4_CREATE_EXCLUSIVE4_1:
 334                         if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
 335                             d_inode(child)->i_atime.tv_sec == v_atime &&
 336                             d_inode(child)->i_size == 0) {
 337                                 open->op_created = true;
 338                                 goto set_attr;  /* subtle */
 339                         }
 340                         status = nfserr_exist;
 341                 }
 342                 goto out;
 343         }
 344
 345         if (!IS_POSIXACL(inode))
 346                 iap->ia_mode &= ~current_umask();
 347
 348         fh_fill_pre_attrs(fhp);
 349         status = nfsd4_vfs_create(fhp, child, open);
 350         if (status != nfs_ok)
 351                 goto out;
 352         open->op_created = true;
 353         fh_fill_post_attrs(fhp);
 354
 355         /* A newly created file already has a file size of zero. */
 356         if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
 357                 iap->ia_valid &= ~ATTR_SIZE;
 358         if (nfsd4_create_is_exclusive(open->op_createmode)) {
 359                 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
 360                                 ATTR_MTIME_SET|ATTR_ATIME_SET;
 361                 iap->ia_mtime.tv_sec = v_mtime;
 362                 iap->ia_atime.tv_sec = v_atime;
 363                 iap->ia_mtime.tv_nsec = 0;
 364                 iap->ia_atime.tv_nsec = 0;
 365         }
 366
 367 set_attr:
 368         status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
 369
 370         if (attrs.na_labelerr)
 371                 open->op_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 372         if (attrs.na_aclerr)
 373                 open->op_bmval[0] &= ~FATTR4_WORD0_ACL;
 374 out:
 375         inode_unlock(inode);
 376         nfsd_attrs_free(&attrs);
 377         if (child && !IS_ERR(child))
 378                 dput(child);
 379         fh_drop_write(fhp);
 380         return status;
 381 }
 382
 383 static __be32
 384 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 385 {
 386         struct svc_fh *current_fh = &cstate->current_fh;
 387         int accmode;
 388         __be32 status;
 389
 390         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 391         if (!*resfh)
 392                 return nfserr_jukebox;
 393         fh_init(*resfh, NFS4_FHSIZE);
 394         open->op_truncate = false;
 395
 396         if (open->op_create) {
 397                 /* FIXME: check session persistence and pnfs flags.
 398                  * The nfsv4.1 spec requires the following semantics:
 399                  *
 400                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 401                  * Reply Cache  | server |                 |
 402                  * -------------+--------+-----------------+--------------------
 403                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 404                  *              |        |                 | (SHOULD)
 405                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 406                  *              |        |                 | (SHOULD NOT)
 407                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 408                  * yes          | no     | GUARDED4        | GUARDED4
 409                  * yes          | yes    | GUARDED4        | GUARDED4
 410                  */
 411
 412                 current->fs->umask = open->op_umask;
 413                 status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
 414                 current->fs->umask = 0;
 415
 416                 /*
 417                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 418                  * use the returned bitmask to indicate which attributes
 419                  * we used to store the verifier:
 420                  */
 421                 if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
 422                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 423                                                 FATTR4_WORD1_TIME_MODIFY);
 424         } else {
 425                 status = nfsd_lookup(rqstp, current_fh,
 426                                      open->op_fname, open->op_fnamelen, *resfh);
 427                 if (!status)
 428                         /* NFSv4 protocol requires change attributes even though
 429                          * no change happened.
 430                          */
 431                         fh_fill_both_attrs(current_fh);
 432         }
 433         if (status)
 434                 goto out;
 435         status = nfsd_check_obj_isreg(*resfh);
 436         if (status)
 437                 goto out;
 438
 439         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 440         accmode = NFSD_MAY_NOP;
 441         if (open->op_created ||
 442                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 443                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 444         status = do_open_permission(rqstp, *resfh, open, accmode);
 445         set_change_info(&open->op_cinfo, current_fh);
 446 out:
 447         return status;
 448 }
 449
 450 static __be32
 451 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 452 {
 453         struct svc_fh *current_fh = &cstate->current_fh;
 454         int accmode = 0;
 455
 456         /* We don't know the target directory, and therefore can not
 457         * set the change info
 458         */
 459
 460         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 461
 462         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 463
 464         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 465                 (open->op_iattr.ia_size == 0);
 466         /*
 467          * In the delegation case, the client is telling us about an
 468          * open that it *already* performed locally, some time ago.  We
 469          * should let it succeed now if possible.
 470          *
 471          * In the case of a CLAIM_FH open, on the other hand, the client
 472          * may be counting on us to enforce permissions (the Linux 4.1
 473          * client uses this for normal opens, for example).
 474          */
 475         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 476                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 477
 478         return do_open_permission(rqstp, current_fh, open, accmode);
 479 }
 480
 481 static void
 482 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 483 {
 484         struct nfsd4_sessionid *sid =
 485                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 486
 487         clid->cl_boot = sid->clientid.cl_boot;
 488         clid->cl_id = sid->clientid.cl_id;
 489 }
 490
 491 static __be32
 492 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 493            union nfsd4_op_u *u)
 494 {
 495         struct nfsd4_open *open = &u->open;
 496         __be32 status;
 497         struct svc_fh *resfh = NULL;
 498         struct net *net = SVC_NET(rqstp);
 499         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 500         bool reclaim = false;
 501
 502         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 503                 (int)open->op_fnamelen, open->op_fname,
 504                 open->op_openowner);
 505
 506         open->op_filp = NULL;
 507         open->op_rqstp = rqstp;
 508
 509         /* This check required by spec. */
 510         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 511                 return nfserr_inval;
 512
 513         open->op_created = false;
 514         /*
 515          * RFC5661 18.51.3
 516          * Before RECLAIM_COMPLETE done, server should deny new lock
 517          */
 518         if (nfsd4_has_session(cstate) &&
 519             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
 520             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 521                 return nfserr_grace;
 522
 523         if (nfsd4_has_session(cstate))
 524                 copy_clientid(&open->op_clientid, cstate->session);
 525
 526         /* check seqid for replay. set nfs4_owner */
 527         status = nfsd4_process_open1(cstate, open, nn);
 528         if (status == nfserr_replay_me) {
 529                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 530                 fh_put(&cstate->current_fh);
 531                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 532                                 &rp->rp_openfh);
 533                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 534                 if (status)
 535                         dprintk("nfsd4_open: replay failed"
 536                                 " restoring previous filehandle\n");
 537                 else
 538                         status = nfserr_replay_me;
 539         }
 540         if (status)
 541                 goto out;
 542         if (open->op_xdr_error) {
 543                 status = open->op_xdr_error;
 544                 goto out;
 545         }
 546
 547         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 548         if (status)
 549                 goto out;
 550
 551         /* Openowner is now set, so sequence id will get bumped.  Now we need
 552          * these checks before we do any creates: */
 553         status = nfserr_grace;
 554         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 555                 goto out;
 556         status = nfserr_no_grace;
 557         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 558                 goto out;
 559
 560         switch (open->op_claim_type) {
 561         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 562         case NFS4_OPEN_CLAIM_NULL:
 563                 status = do_open_lookup(rqstp, cstate, open, &resfh);
 564                 if (status)
 565                         goto out;
 566                 break;
 567         case NFS4_OPEN_CLAIM_PREVIOUS:
 568                 status = nfs4_check_open_reclaim(cstate->clp);
 569                 if (status)
 570                         goto out;
 571                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 572                 reclaim = true;
 573                 fallthrough;
 574         case NFS4_OPEN_CLAIM_FH:
 575         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 576                 status = do_open_fhandle(rqstp, cstate, open);
 577                 if (status)
 578                         goto out;
 579                 resfh = &cstate->current_fh;
 580                 break;
 581         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 582         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 583                 status = nfserr_notsupp;
 584                 goto out;
 585         default:
 586                 status = nfserr_inval;
 587                 goto out;
 588         }
 589
 590         status = nfsd4_process_open2(rqstp, resfh, open);
 591         if (status && open->op_created)
 592                 pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
 593                         be32_to_cpu(status));
 594         if (reclaim && !status)
 595                 nn->somebody_reclaimed = true;
 596 out:
 597         if (open->op_filp) {
 598                 fput(open->op_filp);
 599                 open->op_filp = NULL;
 600         }
 601         if (resfh && resfh != &cstate->current_fh) {
 602                 fh_dup2(&cstate->current_fh, resfh);
 603                 fh_put(resfh);
 604                 kfree(resfh);
 605         }
 606         nfsd4_cleanup_open_state(cstate, open);
 607         nfsd4_bump_seqid(cstate, status);
 608         return status;
 609 }
 610
 611 /*
 612  * OPEN is the only seqid-mutating operation whose decoding can fail
 613  * with a seqid-mutating error (specifically, decoding of user names in
 614  * the attributes).  Therefore we have to do some processing to look up
 615  * the stateowner so that we can bump the seqid.
 616  */
 617 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 618 {
 619         struct nfsd4_open *open = &op->u.open;
 620
 621         if (!seqid_mutating_err(ntohl(op->status)))
 622                 return op->status;
 623         if (nfsd4_has_session(cstate))
 624                 return op->status;
 625         open->op_xdr_error = op->status;
 626         return nfsd4_open(rqstp, cstate, &op->u);
 627 }
 628
 629 /*
 630  * filehandle-manipulating ops.
 631  */
 632 static __be32
 633 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 634             union nfsd4_op_u *u)
 635 {
 636         u->getfh = &cstate->current_fh;
 637         return nfs_ok;
 638 }
 639
 640 static __be32
 641 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 642             union nfsd4_op_u *u)
 643 {
 644         struct nfsd4_putfh *putfh = &u->putfh;
 645         __be32 ret;
 646
 647         fh_put(&cstate->current_fh);
 648         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 649         memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
 650                putfh->pf_fhlen);
 651         ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 652 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 653         if (ret == nfserr_stale && putfh->no_verify) {
 654                 SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
 655                 ret = 0;
 656         }
 657 #endif
 658         return ret;
 659 }
 660
 661 static __be32
 662 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 663                 union nfsd4_op_u *u)
 664 {
 665         fh_put(&cstate->current_fh);
 666
 667         return exp_pseudoroot(rqstp, &cstate->current_fh);
 668 }
 669
 670 static __be32
 671 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 672                 union nfsd4_op_u *u)
 673 {
 674         if (!cstate->save_fh.fh_dentry)
 675                 return nfserr_restorefh;
 676
 677         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 678         if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
 679                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 680                 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
 681         }
 682         return nfs_ok;
 683 }
 684
 685 static __be32
 686 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 687              union nfsd4_op_u *u)
 688 {
 689         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 690         if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
 691                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 692                 SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
 693         }
 694         return nfs_ok;
 695 }
 696
 697 /*
 698  * misc nfsv4 ops
 699  */
 700 static __be32
 701 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 702              union nfsd4_op_u *u)
 703 {
 704         struct nfsd4_access *access = &u->access;
 705         u32 access_full;
 706
 707         access_full = NFS3_ACCESS_FULL;
 708         if (cstate->minorversion >= 2)
 709                 access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
 710                                NFS4_ACCESS_XAWRITE;
 711
 712         if (access->ac_req_access & ~access_full)
 713                 return nfserr_inval;
 714
 715         access->ac_resp_access = access->ac_req_access;
 716         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 717                            &access->ac_supported);
 718 }
 719
 720 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 721 {
 722         __be32 *verf = (__be32 *)verifier->data;
 723
 724         BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
 725
 726         nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
 727 }
 728
 729 static __be32
 730 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 731              union nfsd4_op_u *u)
 732 {
 733         struct nfsd4_commit *commit = &u->commit;
 734         struct nfsd_file *nf;
 735         __be32 status;
 736
 737         status = nfsd_file_acquire(rqstp, &cstate->current_fh, NFSD_MAY_WRITE |
 738                                    NFSD_MAY_NOT_BREAK_LEASE, &nf);
 739         if (status != nfs_ok)
 740                 return status;
 741
 742         status = nfsd_commit(rqstp, &cstate->current_fh, nf, commit->co_offset,
 743                              commit->co_count,
 744                              (__be32 *)commit->co_verf.data);
 745         nfsd_file_put(nf);
 746         return status;
 747 }
 748
 749 static __be32
 750 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 751              union nfsd4_op_u *u)
 752 {
 753         struct nfsd4_create *create = &u->create;
 754         struct nfsd_attrs attrs = {
 755                 .na_iattr       = &create->cr_iattr,
 756                 .na_seclabel    = &create->cr_label,
 757         };
 758         struct svc_fh resfh;
 759         __be32 status;
 760         dev_t rdev;
 761
 762         fh_init(&resfh, NFS4_FHSIZE);
 763
 764         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 765         if (status)
 766                 return status;
 767
 768         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 769                                     nfsd_attrmask);
 770         if (status)
 771                 return status;
 772
 773         status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
 774         current->fs->umask = create->cr_umask;
 775         switch (create->cr_type) {
 776         case NF4LNK:
 777                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 778                                       create->cr_name, create->cr_namelen,
 779                                       create->cr_data, &attrs, &resfh);
 780                 break;
 781
 782         case NF4BLK:
 783                 status = nfserr_inval;
 784                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 785                 if (MAJOR(rdev) != create->cr_specdata1 ||
 786                     MINOR(rdev) != create->cr_specdata2)
 787                         goto out_umask;
 788                 status = nfsd_create(rqstp, &cstate->current_fh,
 789                                      create->cr_name, create->cr_namelen,
 790                                      &attrs, S_IFBLK, rdev, &resfh);
 791                 break;
 792
 793         case NF4CHR:
 794                 status = nfserr_inval;
 795                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 796                 if (MAJOR(rdev) != create->cr_specdata1 ||
 797                     MINOR(rdev) != create->cr_specdata2)
 798                         goto out_umask;
 799                 status = nfsd_create(rqstp, &cstate->current_fh,
 800                                      create->cr_name, create->cr_namelen,
 801                                      &attrs, S_IFCHR, rdev, &resfh);
 802                 break;
 803
 804         case NF4SOCK:
 805                 status = nfsd_create(rqstp, &cstate->current_fh,
 806                                      create->cr_name, create->cr_namelen,
 807                                      &attrs, S_IFSOCK, 0, &resfh);
 808                 break;
 809
 810         case NF4FIFO:
 811                 status = nfsd_create(rqstp, &cstate->current_fh,
 812                                      create->cr_name, create->cr_namelen,
 813                                      &attrs, S_IFIFO, 0, &resfh);
 814                 break;
 815
 816         case NF4DIR:
 817                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 818                 status = nfsd_create(rqstp, &cstate->current_fh,
 819                                      create->cr_name, create->cr_namelen,
 820                                      &attrs, S_IFDIR, 0, &resfh);
 821                 break;
 822
 823         default:
 824                 status = nfserr_badtype;
 825         }
 826
 827         if (status)
 828                 goto out;
 829
 830         if (attrs.na_labelerr)
 831                 create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 832         if (attrs.na_aclerr)
 833                 create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
 834         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 835         fh_dup2(&cstate->current_fh, &resfh);
 836 out:
 837         fh_put(&resfh);
 838 out_umask:
 839         current->fs->umask = 0;
 840         nfsd_attrs_free(&attrs);
 841         return status;
 842 }
 843
 844 static __be32
 845 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 846               union nfsd4_op_u *u)
 847 {
 848         struct nfsd4_getattr *getattr = &u->getattr;
 849         __be32 status;
 850
 851         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 852         if (status)
 853                 return status;
 854
 855         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 856                 return nfserr_inval;
 857
 858         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 859         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 860         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 861
 862         getattr->ga_fhp = &cstate->current_fh;
 863         return nfs_ok;
 864 }
 865
 866 static __be32
 867 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 868            union nfsd4_op_u *u)
 869 {
 870         struct nfsd4_link *link = &u->link;
 871         __be32 status;
 872
 873         status = nfsd_link(rqstp, &cstate->current_fh,
 874                            link->li_name, link->li_namelen, &cstate->save_fh);
 875         if (!status)
 876                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 877         return status;
 878 }
 879
 880 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 881 {
 882         struct svc_fh tmp_fh;
 883         __be32 ret;
 884
 885         fh_init(&tmp_fh, NFS4_FHSIZE);
 886         ret = exp_pseudoroot(rqstp, &tmp_fh);
 887         if (ret)
 888                 return ret;
 889         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 890                 fh_put(&tmp_fh);
 891                 return nfserr_noent;
 892         }
 893         fh_put(&tmp_fh);
 894         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 895 }
 896
 897 static __be32
 898 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 899               union nfsd4_op_u *u)
 900 {
 901         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 902 }
 903
 904 static __be32
 905 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 906              union nfsd4_op_u *u)
 907 {
 908         return nfsd_lookup(rqstp, &cstate->current_fh,
 909                            u->lookup.lo_name, u->lookup.lo_len,
 910                            &cstate->current_fh);
 911 }
 912
 913 static __be32
 914 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 915            union nfsd4_op_u *u)
 916 {
 917         struct nfsd4_read *read = &u->read;
 918         __be32 status;
 919
 920         read->rd_nf = NULL;
 921
 922         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 923                               read->rd_offset, read->rd_length);
 924
 925         read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
 926         if (read->rd_offset > (u64)OFFSET_MAX)
 927                 read->rd_offset = (u64)OFFSET_MAX;
 928         if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
 929                 read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
 930
 931         /*
 932          * If we do a zero copy read, then a client will see read data
 933          * that reflects the state of the file *after* performing the
 934          * following compound.
 935          *
 936          * To ensure proper ordering, we therefore turn off zero copy if
 937          * the client wants us to do more in this compound:
 938          */
 939         if (!nfsd4_last_compound_op(rqstp))
 940                 __clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 941
 942         /* check stateid */
 943         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 944                                         &read->rd_stateid, RD_STATE,
 945                                         &read->rd_nf, NULL);
 946
 947         read->rd_rqstp = rqstp;
 948         read->rd_fhp = &cstate->current_fh;
 949         return status;
 950 }
 951
 952
 953 static void
 954 nfsd4_read_release(union nfsd4_op_u *u)
 955 {
 956         if (u->read.rd_nf)
 957                 nfsd_file_put(u->read.rd_nf);
 958         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 959                              u->read.rd_offset, u->read.rd_length);
 960 }
 961
 962 static __be32
 963 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 964               union nfsd4_op_u *u)
 965 {
 966         struct nfsd4_readdir *readdir = &u->readdir;
 967         u64 cookie = readdir->rd_cookie;
 968         static const nfs4_verifier zeroverf;
 969
 970         /* no need to check permission - this will be done in nfsd_readdir() */
 971
 972         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 973                 return nfserr_inval;
 974
 975         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 976         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 977         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 978
 979         if ((cookie == 1) || (cookie == 2) ||
 980             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 981                 return nfserr_bad_cookie;
 982
 983         readdir->rd_rqstp = rqstp;
 984         readdir->rd_fhp = &cstate->current_fh;
 985         return nfs_ok;
 986 }
 987
 988 static __be32
 989 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 990                union nfsd4_op_u *u)
 991 {
 992         u->readlink.rl_rqstp = rqstp;
 993         u->readlink.rl_fhp = &cstate->current_fh;
 994         return nfs_ok;
 995 }
 996
 997 static __be32
 998 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 999              union nfsd4_op_u *u)
1000 {
1001         struct nfsd4_remove *remove = &u->remove;
1002         __be32 status;
1003
1004         if (opens_in_grace(SVC_NET(rqstp)))
1005                 return nfserr_grace;
1006         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1007                              remove->rm_name, remove->rm_namelen);
1008         if (!status)
1009                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1010         return status;
1011 }
1012
1013 static __be32
1014 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1015              union nfsd4_op_u *u)
1016 {
1017         struct nfsd4_rename *rename = &u->rename;
1018         __be32 status;
1019
1020         if (opens_in_grace(SVC_NET(rqstp)))
1021                 return nfserr_grace;
1022         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1023                              rename->rn_snamelen, &cstate->current_fh,
1024                              rename->rn_tname, rename->rn_tnamelen);
1025         if (status)
1026                 return status;
1027         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
1028         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
1029         return nfs_ok;
1030 }
1031
1032 static __be32
1033 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1034               union nfsd4_op_u *u)
1035 {
1036         struct nfsd4_secinfo *secinfo = &u->secinfo;
1037         struct svc_export *exp;
1038         struct dentry *dentry;
1039         __be32 err;
1040
1041         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1042         if (err)
1043                 return err;
1044         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1045                                     secinfo->si_name, secinfo->si_namelen,
1046                                     &exp, &dentry);
1047         if (err)
1048                 return err;
1049         if (d_really_is_negative(dentry)) {
1050                 exp_put(exp);
1051                 err = nfserr_noent;
1052         } else
1053                 secinfo->si_exp = exp;
1054         dput(dentry);
1055         if (cstate->minorversion)
1056                 /* See rfc 5661 section 2.6.3.1.1.8 */
1057                 fh_put(&cstate->current_fh);
1058         return err;
1059 }
1060
1061 static __be32
1062 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1063                 union nfsd4_op_u *u)
1064 {
1065         __be32 err;
1066
1067         switch (u->secinfo_no_name.sin_style) {
1068         case NFS4_SECINFO_STYLE4_CURRENT_FH:
1069                 break;
1070         case NFS4_SECINFO_STYLE4_PARENT:
1071                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1072                 if (err)
1073                         return err;
1074                 break;
1075         default:
1076                 return nfserr_inval;
1077         }
1078
1079         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1080         fh_put(&cstate->current_fh);
1081         return nfs_ok;
1082 }
1083
1084 static void
1085 nfsd4_secinfo_release(union nfsd4_op_u *u)
1086 {
1087         if (u->secinfo.si_exp)
1088                 exp_put(u->secinfo.si_exp);
1089 }
1090
1091 static void
1092 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1093 {
1094         if (u->secinfo_no_name.sin_exp)
1095                 exp_put(u->secinfo_no_name.sin_exp);
1096 }
1097
1098 static __be32
1099 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1100               union nfsd4_op_u *u)
1101 {
1102         struct nfsd4_setattr *setattr = &u->setattr;
1103         struct nfsd_attrs attrs = {
1104                 .na_iattr       = &setattr->sa_iattr,
1105                 .na_seclabel    = &setattr->sa_label,
1106         };
1107         struct inode *inode;
1108         __be32 status = nfs_ok;
1109         int err;
1110
1111         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1112                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
1113                                 &cstate->current_fh, &setattr->sa_stateid,
1114                                 WR_STATE, NULL, NULL);
1115                 if (status)
1116                         return status;
1117         }
1118         err = fh_want_write(&cstate->current_fh);
1119         if (err)
1120                 return nfserrno(err);
1121         status = nfs_ok;
1122
1123         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1124                                     nfsd_attrmask);
1125         if (status)
1126                 goto out;
1127
1128         inode = cstate->current_fh.fh_dentry->d_inode;
1129         status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1130                                    setattr->sa_acl, &attrs);
1131
1132         if (status)
1133                 goto out;
1134         status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
1135                                 0, (time64_t)0);
1136         if (!status)
1137                 status = nfserrno(attrs.na_labelerr);
1138         if (!status)
1139                 status = nfserrno(attrs.na_aclerr);
1140 out:
1141         nfsd_attrs_free(&attrs);
1142         fh_drop_write(&cstate->current_fh);
1143         return status;
1144 }
1145
1146 static __be32
1147 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1148             union nfsd4_op_u *u)
1149 {
1150         struct nfsd4_write *write = &u->write;
1151         stateid_t *stateid = &write->wr_stateid;
1152         struct nfsd_file *nf = NULL;
1153         __be32 status = nfs_ok;
1154         unsigned long cnt;
1155         int nvecs;
1156
1157         if (write->wr_offset > (u64)OFFSET_MAX ||
1158             write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1159                 return nfserr_fbig;
1160
1161         cnt = write->wr_buflen;
1162         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1163                                write->wr_offset, cnt);
1164         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1165                                                 stateid, WR_STATE, &nf, NULL);
1166         if (status)
1167                 return status;
1168
1169         write->wr_how_written = write->wr_stable_how;
1170
1171         nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1172         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1173
1174         status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1175                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1176                                 write->wr_how_written,
1177                                 (__be32 *)write->wr_verifier.data);
1178         nfsd_file_put(nf);
1179
1180         write->wr_bytes_written = cnt;
1181         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1182                               write->wr_offset, cnt);
1183         return status;
1184 }
1185
1186 static __be32
1187 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1188                   stateid_t *src_stateid, struct nfsd_file **src,
1189                   stateid_t *dst_stateid, struct nfsd_file **dst)
1190 {
1191         __be32 status;
1192
1193         if (!cstate->save_fh.fh_dentry)
1194                 return nfserr_nofilehandle;
1195
1196         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1197                                             src_stateid, RD_STATE, src, NULL);
1198         if (status)
1199                 goto out;
1200
1201         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1202                                             dst_stateid, WR_STATE, dst, NULL);
1203         if (status)
1204                 goto out_put_src;
1205
1206         /* fix up for NFS-specific error code */
1207         if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1208             !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1209                 status = nfserr_wrong_type;
1210                 goto out_put_dst;
1211         }
1212
1213 out:
1214         return status;
1215 out_put_dst:
1216         nfsd_file_put(*dst);
1217 out_put_src:
1218         nfsd_file_put(*src);
1219         goto out;
1220 }
1221
1222 static __be32
1223 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1224                 union nfsd4_op_u *u)
1225 {
1226         struct nfsd4_clone *clone = &u->clone;
1227         struct nfsd_file *src, *dst;
1228         __be32 status;
1229
1230         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1231                                    &clone->cl_dst_stateid, &dst);
1232         if (status)
1233                 goto out;
1234
1235         status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1236                         dst, clone->cl_dst_pos, clone->cl_count,
1237                         EX_ISSYNC(cstate->current_fh.fh_export));
1238
1239         nfsd_file_put(dst);
1240         nfsd_file_put(src);
1241 out:
1242         return status;
1243 }
1244
1245 static void nfs4_put_copy(struct nfsd4_copy *copy)
1246 {
1247         if (!refcount_dec_and_test(&copy->refcount))
1248                 return;
1249         kfree(copy->cp_src);
1250         kfree(copy);
1251 }
1252
1253 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1254 {
1255         if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, &copy->cp_flags))
1256                 kthread_stop(copy->copy_task);
1257         nfs4_put_copy(copy);
1258 }
1259
1260 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1261 {
1262         struct nfsd4_copy *copy = NULL;
1263
1264         spin_lock(&clp->async_lock);
1265         if (!list_empty(&clp->async_copies)) {
1266                 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1267                                         copies);
1268                 refcount_inc(&copy->refcount);
1269         }
1270         spin_unlock(&clp->async_lock);
1271         return copy;
1272 }
1273
1274 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1275 {
1276         struct nfsd4_copy *copy;
1277
1278         while ((copy = nfsd4_get_copy(clp)) != NULL)
1279                 nfsd4_stop_copy(copy);
1280 }
1281 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1282
1283 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1284                                    struct nfs_fh *src_fh,
1285                                    nfs4_stateid *stateid);
1286 extern void nfs42_ssc_close(struct file *filep);
1287
1288 extern void nfs_sb_deactive(struct super_block *sb);
1289
1290 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1291
1292 /*
1293  * setup a work entry in the ssc delayed unmount list.
1294  */
1295 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1296                 struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
1297 {
1298         struct nfsd4_ssc_umount_item *ni = NULL;
1299         struct nfsd4_ssc_umount_item *work = NULL;
1300         struct nfsd4_ssc_umount_item *tmp;
1301         DEFINE_WAIT(wait);
1302
1303         *ss_mnt = NULL;
1304         *retwork = NULL;
1305         work = kzalloc(sizeof(*work), GFP_KERNEL);
1306 try_again:
1307         spin_lock(&nn->nfsd_ssc_lock);
1308         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1309                 if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1310                         continue;
1311                 /* found a match */
1312                 if (ni->nsui_busy) {
1313                         /*  wait - and try again */
1314                         prepare_to_wait(&nn->nfsd_ssc_waitq, &wait,
1315                                 TASK_INTERRUPTIBLE);
1316                         spin_unlock(&nn->nfsd_ssc_lock);
1317
1318                         /* allow 20secs for mount/unmount for now - revisit */
1319                         if (signal_pending(current) ||
1320                                         (schedule_timeout(20*HZ) == 0)) {
1321                                 kfree(work);
1322                                 return nfserr_eagain;
1323                         }
1324                         finish_wait(&nn->nfsd_ssc_waitq, &wait);
1325                         goto try_again;
1326                 }
1327                 *ss_mnt = ni->nsui_vfsmount;
1328                 refcount_inc(&ni->nsui_refcnt);
1329                 spin_unlock(&nn->nfsd_ssc_lock);
1330                 kfree(work);
1331
1332                 /* return vfsmount in ss_mnt */
1333                 return 0;
1334         }
1335         if (work) {
1336                 strscpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1337                 refcount_set(&work->nsui_refcnt, 2);
1338                 work->nsui_busy = true;
1339                 list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1340                 *retwork = work;
1341         }
1342         spin_unlock(&nn->nfsd_ssc_lock);
1343         return 0;
1344 }
1345
1346 static void nfsd4_ssc_update_dul_work(struct nfsd_net *nn,
1347                 struct nfsd4_ssc_umount_item *work, struct vfsmount *ss_mnt)
1348 {
1349         /* set nsui_vfsmount, clear busy flag and wakeup waiters */
1350         spin_lock(&nn->nfsd_ssc_lock);
1351         work->nsui_vfsmount = ss_mnt;
1352         work->nsui_busy = false;
1353         wake_up_all(&nn->nfsd_ssc_waitq);
1354         spin_unlock(&nn->nfsd_ssc_lock);
1355 }
1356
1357 static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
1358                 struct nfsd4_ssc_umount_item *work)
1359 {
1360         spin_lock(&nn->nfsd_ssc_lock);
1361         list_del(&work->nsui_list);
1362         wake_up_all(&nn->nfsd_ssc_waitq);
1363         spin_unlock(&nn->nfsd_ssc_lock);
1364         kfree(work);
1365 }
1366
1367 /*
1368  * Support one copy source server for now.
1369  */
1370 static __be32
1371 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1372                        struct vfsmount **mount)
1373 {
1374         struct file_system_type *type;
1375         struct vfsmount *ss_mnt;
1376         struct nfs42_netaddr *naddr;
1377         struct sockaddr_storage tmp_addr;
1378         size_t tmp_addrlen, match_netid_len = 3;
1379         char *startsep = "", *endsep = "", *match_netid = "tcp";
1380         char *ipaddr, *dev_name, *raw_data;
1381         int len, raw_len;
1382         __be32 status = nfserr_inval;
1383         struct nfsd4_ssc_umount_item *work = NULL;
1384         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1385
1386         naddr = &nss->u.nl4_addr;
1387         tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1388                                          naddr->addr_len,
1389                                          (struct sockaddr *)&tmp_addr,
1390                                          sizeof(tmp_addr));
1391         if (tmp_addrlen == 0)
1392                 goto out_err;
1393
1394         if (tmp_addr.ss_family == AF_INET6) {
1395                 startsep = "[";
1396                 endsep = "]";
1397                 match_netid = "tcp6";
1398                 match_netid_len = 4;
1399         }
1400
1401         if (naddr->netid_len != match_netid_len ||
1402                 strncmp(naddr->netid, match_netid, naddr->netid_len))
1403                 goto out_err;
1404
1405         /* Construct the raw data for the vfs_kern_mount call */
1406         len = RPC_MAX_ADDRBUFLEN + 1;
1407         ipaddr = kzalloc(len, GFP_KERNEL);
1408         if (!ipaddr)
1409                 goto out_err;
1410
1411         rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1412
1413         /* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1414
1415         raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1416         raw_data = kzalloc(raw_len, GFP_KERNEL);
1417         if (!raw_data)
1418                 goto out_free_ipaddr;
1419
1420         snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1421
1422         status = nfserr_nodev;
1423         type = get_fs_type("nfs");
1424         if (!type)
1425                 goto out_free_rawdata;
1426
1427         /* Set the server:<export> for the vfs_kern_mount call */
1428         dev_name = kzalloc(len + 5, GFP_KERNEL);
1429         if (!dev_name)
1430                 goto out_free_rawdata;
1431         snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1432
1433         status = nfsd4_ssc_setup_dul(nn, ipaddr, &work, &ss_mnt);
1434         if (status)
1435                 goto out_free_devname;
1436         if (ss_mnt)
1437                 goto out_done;
1438
1439         /* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1440         ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1441         module_put(type->owner);
1442         if (IS_ERR(ss_mnt)) {
1443                 status = nfserr_nodev;
1444                 if (work)
1445                         nfsd4_ssc_cancel_dul_work(nn, work);
1446                 goto out_free_devname;
1447         }
1448         if (work)
1449                 nfsd4_ssc_update_dul_work(nn, work, ss_mnt);
1450 out_done:
1451         status = 0;
1452         *mount = ss_mnt;
1453
1454 out_free_devname:
1455         kfree(dev_name);
1456 out_free_rawdata:
1457         kfree(raw_data);
1458 out_free_ipaddr:
1459         kfree(ipaddr);
1460 out_err:
1461         return status;
1462 }
1463
1464 static void
1465 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1466 {
1467         nfs_do_sb_deactive(ss_mnt->mnt_sb);
1468         mntput(ss_mnt);
1469 }
1470
1471 /*
1472  * Verify COPY destination stateid.
1473  *
1474  * Connect to the source server with NFSv4.1.
1475  * Create the source struct file for nfsd_copy_range.
1476  * Called with COPY cstate:
1477  *    SAVED_FH: source filehandle
1478  *    CURRENT_FH: destination filehandle
1479  */
1480 static __be32
1481 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1482                       struct nfsd4_compound_state *cstate,
1483                       struct nfsd4_copy *copy, struct vfsmount **mount)
1484 {
1485         struct svc_fh *s_fh = NULL;
1486         stateid_t *s_stid = &copy->cp_src_stateid;
1487         __be32 status = nfserr_inval;
1488
1489         /* Verify the destination stateid and set dst struct file*/
1490         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1491                                             &copy->cp_dst_stateid,
1492                                             WR_STATE, &copy->nf_dst, NULL);
1493         if (status)
1494                 goto out;
1495
1496         status = nfsd4_interssc_connect(copy->cp_src, rqstp, mount);
1497         if (status)
1498                 goto out;
1499
1500         s_fh = &cstate->save_fh;
1501
1502         copy->c_fh.size = s_fh->fh_handle.fh_size;
1503         memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1504         copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1505         memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1506                sizeof(stateid_opaque_t));
1507
1508         status = 0;
1509 out:
1510         return status;
1511 }
1512
1513 static void
1514 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
1515                         struct nfsd_file *dst)
1516 {
1517         bool found = false;
1518         long timeout;
1519         struct nfsd4_ssc_umount_item *tmp;
1520         struct nfsd4_ssc_umount_item *ni = NULL;
1521         struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1522
1523         nfs42_ssc_close(filp);
1524         nfsd_file_put(dst);
1525         fput(filp);
1526
1527         if (!nn) {
1528                 mntput(ss_mnt);
1529                 return;
1530         }
1531         spin_lock(&nn->nfsd_ssc_lock);
1532         timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1533         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1534                 if (ni->nsui_vfsmount->mnt_sb == ss_mnt->mnt_sb) {
1535                         list_del(&ni->nsui_list);
1536                         /*
1537                          * vfsmount can be shared by multiple exports,
1538                          * decrement refcnt. If the count drops to 1 it
1539                          * will be unmounted when nsui_expire expires.
1540                          */
1541                         refcount_dec(&ni->nsui_refcnt);
1542                         ni->nsui_expire = jiffies + timeout;
1543                         list_add_tail(&ni->nsui_list, &nn->nfsd_ssc_mount_list);
1544                         found = true;
1545                         break;
1546                 }
1547         }
1548         spin_unlock(&nn->nfsd_ssc_lock);
1549         if (!found) {
1550                 mntput(ss_mnt);
1551                 return;
1552         }
1553 }
1554
1555 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1556
1557 static __be32
1558 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1559                       struct nfsd4_compound_state *cstate,
1560                       struct nfsd4_copy *copy,
1561                       struct vfsmount **mount)
1562 {
1563         *mount = NULL;
1564         return nfserr_inval;
1565 }
1566
1567 static void
1568 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
1569                         struct nfsd_file *dst)
1570 {
1571 }
1572
1573 static void
1574 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1575 {
1576 }
1577
1578 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1579                                    struct nfs_fh *src_fh,
1580                                    nfs4_stateid *stateid)
1581 {
1582         return NULL;
1583 }
1584 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1585
1586 static __be32
1587 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1588                       struct nfsd4_compound_state *cstate,
1589                       struct nfsd4_copy *copy)
1590 {
1591         return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1592                                  &copy->nf_src, &copy->cp_dst_stateid,
1593                                  &copy->nf_dst);
1594 }
1595
1596 static void
1597 nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
1598 {
1599         nfsd_file_put(src);
1600         nfsd_file_put(dst);
1601 }
1602
1603 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1604 {
1605         struct nfsd4_cb_offload *cbo =
1606                 container_of(cb, struct nfsd4_cb_offload, co_cb);
1607
1608         kfree(cbo);
1609 }
1610
1611 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1612                                  struct rpc_task *task)
1613 {
1614         struct nfsd4_cb_offload *cbo =
1615                 container_of(cb, struct nfsd4_cb_offload, co_cb);
1616
1617         trace_nfsd_cb_offload_done(&cbo->co_res.cb_stateid, task);
1618         return 1;
1619 }
1620
1621 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1622         .release = nfsd4_cb_offload_release,
1623         .done = nfsd4_cb_offload_done
1624 };
1625
1626 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1627 {
1628         copy->cp_res.wr_stable_how =
1629                 test_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags) ?
1630                         NFS_FILE_SYNC : NFS_UNSTABLE;
1631         nfsd4_copy_set_sync(copy, sync);
1632         gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1633 }
1634
1635 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1636                                      struct file *dst,
1637                                      struct file *src)
1638 {
1639         errseq_t since;
1640         ssize_t bytes_copied = 0;
1641         u64 bytes_total = copy->cp_count;
1642         u64 src_pos = copy->cp_src_pos;
1643         u64 dst_pos = copy->cp_dst_pos;
1644         int status;
1645         loff_t end;
1646
1647         /* See RFC 7862 p.67: */
1648         if (bytes_total == 0)
1649                 bytes_total = ULLONG_MAX;
1650         do {
1651                 if (kthread_should_stop())
1652                         break;
1653                 bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1654                                                     bytes_total);
1655                 if (bytes_copied <= 0)
1656                         break;
1657                 bytes_total -= bytes_copied;
1658                 copy->cp_res.wr_bytes_written += bytes_copied;
1659                 src_pos += bytes_copied;
1660                 dst_pos += bytes_copied;
1661         } while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1662         /* for a non-zero asynchronous copy do a commit of data */
1663         if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1664                 since = READ_ONCE(dst->f_wb_err);
1665                 end = copy->cp_dst_pos + copy->cp_res.wr_bytes_written - 1;
1666                 status = vfs_fsync_range(dst, copy->cp_dst_pos, end, 0);
1667                 if (!status)
1668                         status = filemap_check_wb_err(dst->f_mapping, since);
1669                 if (!status)
1670                         set_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags);
1671         }
1672         return bytes_copied;
1673 }
1674
1675 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1676                             struct file *src, struct file *dst,
1677                             bool sync)
1678 {
1679         __be32 status;
1680         ssize_t bytes;
1681
1682         bytes = _nfsd_copy_file_range(copy, dst, src);
1683
1684         /* for async copy, we ignore the error, client can always retry
1685          * to get the error
1686          */
1687         if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1688                 status = nfserrno(bytes);
1689         else {
1690                 nfsd4_init_copy_res(copy, sync);
1691                 status = nfs_ok;
1692         }
1693         return status;
1694 }
1695
1696 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1697 {
1698         dst->cp_src_pos = src->cp_src_pos;
1699         dst->cp_dst_pos = src->cp_dst_pos;
1700         dst->cp_count = src->cp_count;
1701         dst->cp_flags = src->cp_flags;
1702         memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1703         memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1704         dst->cp_clp = src->cp_clp;
1705         dst->nf_dst = nfsd_file_get(src->nf_dst);
1706         /* for inter, nf_src doesn't exist yet */
1707         if (!nfsd4_ssc_is_inter(src))
1708                 dst->nf_src = nfsd_file_get(src->nf_src);
1709
1710         memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1711         memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1712         memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1713         memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1714         dst->ss_mnt = src->ss_mnt;
1715 }
1716
1717 static void cleanup_async_copy(struct nfsd4_copy *copy)
1718 {
1719         nfs4_free_copy_state(copy);
1720         nfsd_file_put(copy->nf_dst);
1721         if (!nfsd4_ssc_is_inter(copy))
1722                 nfsd_file_put(copy->nf_src);
1723         spin_lock(&copy->cp_clp->async_lock);
1724         list_del(&copy->copies);
1725         spin_unlock(&copy->cp_clp->async_lock);
1726         nfs4_put_copy(copy);
1727 }
1728
1729 static void nfsd4_send_cb_offload(struct nfsd4_copy *copy, __be32 nfserr)
1730 {
1731         struct nfsd4_cb_offload *cbo;
1732
1733         cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
1734         if (!cbo)
1735                 return;
1736
1737         memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
1738         memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
1739         cbo->co_nfserr = nfserr;
1740
1741         nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1742                       NFSPROC4_CLNT_CB_OFFLOAD);
1743         trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1744                               &cbo->co_fh, copy->cp_count, nfserr);
1745         nfsd4_run_cb(&cbo->co_cb);
1746 }
1747
1748 /**
1749  * nfsd4_do_async_copy - kthread function for background server-side COPY
1750  * @data: arguments for COPY operation
1751  *
1752  * Return values:
1753  *   %0: Copy operation is done.
1754  */
1755 static int nfsd4_do_async_copy(void *data)
1756 {
1757         struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1758         __be32 nfserr;
1759
1760         if (nfsd4_ssc_is_inter(copy)) {
1761                 struct file *filp;
1762
1763                 filp = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
1764                                       &copy->stateid);
1765                 if (IS_ERR(filp)) {
1766                         switch (PTR_ERR(filp)) {
1767                         case -EBADF:
1768                                 nfserr = nfserr_wrong_type;
1769                                 break;
1770                         default:
1771                                 nfserr = nfserr_offload_denied;
1772                         }
1773                         nfsd4_interssc_disconnect(copy->ss_mnt);
1774                         goto do_callback;
1775                 }
1776                 nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1777                                        false);
1778                 nfsd4_cleanup_inter_ssc(copy->ss_mnt, filp, copy->nf_dst);
1779         } else {
1780                 nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1781                                        copy->nf_dst->nf_file, false);
1782                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1783         }
1784
1785 do_callback:
1786         nfsd4_send_cb_offload(copy, nfserr);
1787         cleanup_async_copy(copy);
1788         return 0;
1789 }
1790
1791 static __be32
1792 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1793                 union nfsd4_op_u *u)
1794 {
1795         struct nfsd4_copy *copy = &u->copy;
1796         __be32 status;
1797         struct nfsd4_copy *async_copy = NULL;
1798
1799         if (nfsd4_ssc_is_inter(copy)) {
1800                 if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1801                         status = nfserr_notsupp;
1802                         goto out;
1803                 }
1804                 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
1805                                 &copy->ss_mnt);
1806                 if (status)
1807                         return nfserr_offload_denied;
1808         } else {
1809                 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1810                 if (status)
1811                         return status;
1812         }
1813
1814         copy->cp_clp = cstate->clp;
1815         memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1816                 sizeof(struct knfsd_fh));
1817         if (nfsd4_copy_is_async(copy)) {
1818                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1819
1820                 status = nfserrno(-ENOMEM);
1821                 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1822                 if (!async_copy)
1823                         goto out_err;
1824                 async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1825                 if (!async_copy->cp_src)
1826                         goto out_err;
1827                 if (!nfs4_init_copy_state(nn, copy))
1828                         goto out_err;
1829                 refcount_set(&async_copy->refcount, 1);
1830                 memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.cs_stid,
1831                         sizeof(copy->cp_res.cb_stateid));
1832                 dup_copy_fields(copy, async_copy);
1833                 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1834                                 async_copy, "%s", "copy thread");
1835                 if (IS_ERR(async_copy->copy_task))
1836                         goto out_err;
1837                 spin_lock(&async_copy->cp_clp->async_lock);
1838                 list_add(&async_copy->copies,
1839                                 &async_copy->cp_clp->async_copies);
1840                 spin_unlock(&async_copy->cp_clp->async_lock);
1841                 wake_up_process(async_copy->copy_task);
1842                 status = nfs_ok;
1843         } else {
1844                 status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1845                                        copy->nf_dst->nf_file, true);
1846                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1847         }
1848 out:
1849         return status;
1850 out_err:
1851         if (async_copy)
1852                 cleanup_async_copy(async_copy);
1853         status = nfserrno(-ENOMEM);
1854         if (nfsd4_ssc_is_inter(copy))
1855                 nfsd4_interssc_disconnect(copy->ss_mnt);
1856         goto out;
1857 }
1858
1859 struct nfsd4_copy *
1860 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1861 {
1862         struct nfsd4_copy *copy;
1863
1864         spin_lock(&clp->async_lock);
1865         list_for_each_entry(copy, &clp->async_copies, copies) {
1866                 if (memcmp(&copy->cp_stateid.cs_stid, stateid, NFS4_STATEID_SIZE))
1867                         continue;
1868                 refcount_inc(&copy->refcount);
1869                 spin_unlock(&clp->async_lock);
1870                 return copy;
1871         }
1872         spin_unlock(&clp->async_lock);
1873         return NULL;
1874 }
1875
1876 static __be32
1877 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1878                      struct nfsd4_compound_state *cstate,
1879                      union nfsd4_op_u *u)
1880 {
1881         struct nfsd4_offload_status *os = &u->offload_status;
1882         struct nfsd4_copy *copy;
1883         struct nfs4_client *clp = cstate->clp;
1884
1885         copy = find_async_copy(clp, &os->stateid);
1886         if (!copy) {
1887                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1888
1889                 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1890         } else
1891                 nfsd4_stop_copy(copy);
1892
1893         return nfs_ok;
1894 }
1895
1896 static __be32
1897 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1898                   union nfsd4_op_u *u)
1899 {
1900         struct nfsd4_copy_notify *cn = &u->copy_notify;
1901         __be32 status;
1902         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1903         struct nfs4_stid *stid;
1904         struct nfs4_cpntf_state *cps;
1905         struct nfs4_client *clp = cstate->clp;
1906
1907         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1908                                         &cn->cpn_src_stateid, RD_STATE, NULL,
1909                                         &stid);
1910         if (status)
1911                 return status;
1912
1913         cn->cpn_sec = nn->nfsd4_lease;
1914         cn->cpn_nsec = 0;
1915
1916         status = nfserrno(-ENOMEM);
1917         cps = nfs4_alloc_init_cpntf_state(nn, stid);
1918         if (!cps)
1919                 goto out;
1920         memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.cs_stid, sizeof(stateid_t));
1921         memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1922         memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1923
1924         /* For now, only return one server address in cpn_src, the
1925          * address used by the client to connect to this server.
1926          */
1927         cn->cpn_src->nl4_type = NL4_NETADDR;
1928         status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1929                                  &cn->cpn_src->u.nl4_addr);
1930         WARN_ON_ONCE(status);
1931         if (status) {
1932                 nfs4_put_cpntf_state(nn, cps);
1933                 goto out;
1934         }
1935 out:
1936         nfs4_put_stid(stid);
1937         return status;
1938 }
1939
1940 static __be32
1941 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1942                 struct nfsd4_fallocate *fallocate, int flags)
1943 {
1944         __be32 status;
1945         struct nfsd_file *nf;
1946
1947         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1948                                             &fallocate->falloc_stateid,
1949                                             WR_STATE, &nf, NULL);
1950         if (status != nfs_ok)
1951                 return status;
1952
1953         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1954                                      fallocate->falloc_offset,
1955                                      fallocate->falloc_length,
1956                                      flags);
1957         nfsd_file_put(nf);
1958         return status;
1959 }
1960 static __be32
1961 nfsd4_offload_status(struct svc_rqst *rqstp,
1962                      struct nfsd4_compound_state *cstate,
1963                      union nfsd4_op_u *u)
1964 {
1965         struct nfsd4_offload_status *os = &u->offload_status;
1966         __be32 status = 0;
1967         struct nfsd4_copy *copy;
1968         struct nfs4_client *clp = cstate->clp;
1969
1970         copy = find_async_copy(clp, &os->stateid);
1971         if (copy) {
1972                 os->count = copy->cp_res.wr_bytes_written;
1973                 nfs4_put_copy(copy);
1974         } else
1975                 status = nfserr_bad_stateid;
1976
1977         return status;
1978 }
1979
1980 static __be32
1981 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1982                union nfsd4_op_u *u)
1983 {
1984         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1985 }
1986
1987 static __be32
1988 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1989                  union nfsd4_op_u *u)
1990 {
1991         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1992                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1993 }
1994
1995 static __be32
1996 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1997            union nfsd4_op_u *u)
1998 {
1999         struct nfsd4_seek *seek = &u->seek;
2000         int whence;
2001         __be32 status;
2002         struct nfsd_file *nf;
2003
2004         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2005                                             &seek->seek_stateid,
2006                                             RD_STATE, &nf, NULL);
2007         if (status)
2008                 return status;
2009
2010         switch (seek->seek_whence) {
2011         case NFS4_CONTENT_DATA:
2012                 whence = SEEK_DATA;
2013                 break;
2014         case NFS4_CONTENT_HOLE:
2015                 whence = SEEK_HOLE;
2016                 break;
2017         default:
2018                 status = nfserr_union_notsupp;
2019                 goto out;
2020         }
2021
2022         /*
2023          * Note:  This call does change file->f_pos, but nothing in NFSD
2024          *        should ever file->f_pos.
2025          */
2026         seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2027         if (seek->seek_pos < 0)
2028                 status = nfserrno(seek->seek_pos);
2029         else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2030                 seek->seek_eof = true;
2031
2032 out:
2033         nfsd_file_put(nf);
2034         return status;
2035 }
2036
2037 /* This routine never returns NFS_OK!  If there are no other errors, it
2038  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2039  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
2040  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2041  */
2042 static __be32
2043 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2044              struct nfsd4_verify *verify)
2045 {
2046         __be32 *buf, *p;
2047         int count;
2048         __be32 status;
2049
2050         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2051         if (status)
2052                 return status;
2053
2054         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2055         if (status)
2056                 return status;
2057
2058         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2059             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2060                 return nfserr_inval;
2061         if (verify->ve_attrlen & 3)
2062                 return nfserr_inval;
2063
2064         /* count in words:
2065          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2066          */
2067         count = 4 + (verify->ve_attrlen >> 2);
2068         buf = kmalloc(count << 2, GFP_KERNEL);
2069         if (!buf)
2070                 return nfserr_jukebox;
2071
2072         p = buf;
2073         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2074                                     cstate->current_fh.fh_export,
2075                                     cstate->current_fh.fh_dentry,
2076                                     verify->ve_bmval,
2077                                     rqstp, 0);
2078         /*
2079          * If nfsd4_encode_fattr() ran out of space, assume that's because
2080          * the attributes are longer (hence different) than those given:
2081          */
2082         if (status == nfserr_resource)
2083                 status = nfserr_not_same;
2084         if (status)
2085                 goto out_kfree;
2086
2087         /* skip bitmap */
2088         p = buf + 1 + ntohl(buf[0]);
2089         status = nfserr_not_same;
2090         if (ntohl(*p++) != verify->ve_attrlen)
2091                 goto out_kfree;
2092         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2093                 status = nfserr_same;
2094
2095 out_kfree:
2096         kfree(buf);
2097         return status;
2098 }
2099
2100 static __be32
2101 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2102               union nfsd4_op_u *u)
2103 {
2104         __be32 status;
2105
2106         status = _nfsd4_verify(rqstp, cstate, &u->verify);
2107         return status == nfserr_not_same ? nfs_ok : status;
2108 }
2109
2110 static __be32
2111 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2112              union nfsd4_op_u *u)
2113 {
2114         __be32 status;
2115
2116         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2117         return status == nfserr_same ? nfs_ok : status;
2118 }
2119
2120 #ifdef CONFIG_NFSD_PNFS
2121 static const struct nfsd4_layout_ops *
2122 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2123 {
2124         if (!exp->ex_layout_types) {
2125                 dprintk("%s: export does not support pNFS\n", __func__);
2126                 return NULL;
2127         }
2128
2129         if (layout_type >= LAYOUT_TYPE_MAX ||
2130             !(exp->ex_layout_types & (1 << layout_type))) {
2131                 dprintk("%s: layout type %d not supported\n",
2132                         __func__, layout_type);
2133                 return NULL;
2134         }
2135
2136         return nfsd4_layout_ops[layout_type];
2137 }
2138
2139 static __be32
2140 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2141                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2142 {
2143         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2144         const struct nfsd4_layout_ops *ops;
2145         struct nfsd4_deviceid_map *map;
2146         struct svc_export *exp;
2147         __be32 nfserr;
2148
2149         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2150                __func__,
2151                gdp->gd_layout_type,
2152                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2153                gdp->gd_maxcount);
2154
2155         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2156         if (!map) {
2157                 dprintk("%s: couldn't find device ID to export mapping!\n",
2158                         __func__);
2159                 return nfserr_noent;
2160         }
2161
2162         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2163         if (IS_ERR(exp)) {
2164                 dprintk("%s: could not find device id\n", __func__);
2165                 return nfserr_noent;
2166         }
2167
2168         nfserr = nfserr_layoutunavailable;
2169         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2170         if (!ops)
2171                 goto out;
2172
2173         nfserr = nfs_ok;
2174         if (gdp->gd_maxcount != 0) {
2175                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2176                                 rqstp, cstate->clp, gdp);
2177         }
2178
2179         gdp->gd_notify_types &= ops->notify_types;
2180 out:
2181         exp_put(exp);
2182         return nfserr;
2183 }
2184
2185 static void
2186 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2187 {
2188         kfree(u->getdeviceinfo.gd_device);
2189 }
2190
2191 static __be32
2192 nfsd4_layoutget(struct svc_rqst *rqstp,
2193                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2194 {
2195         struct nfsd4_layoutget *lgp = &u->layoutget;
2196         struct svc_fh *current_fh = &cstate->current_fh;
2197         const struct nfsd4_layout_ops *ops;
2198         struct nfs4_layout_stateid *ls;
2199         __be32 nfserr;
2200         int accmode = NFSD_MAY_READ_IF_EXEC;
2201
2202         switch (lgp->lg_seg.iomode) {
2203         case IOMODE_READ:
2204                 accmode |= NFSD_MAY_READ;
2205                 break;
2206         case IOMODE_RW:
2207                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2208                 break;
2209         default:
2210                 dprintk("%s: invalid iomode %d\n",
2211                         __func__, lgp->lg_seg.iomode);
2212                 nfserr = nfserr_badiomode;
2213                 goto out;
2214         }
2215
2216         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2217         if (nfserr)
2218                 goto out;
2219
2220         nfserr = nfserr_layoutunavailable;
2221         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2222         if (!ops)
2223                 goto out;
2224
2225         /*
2226          * Verify minlength and range as per RFC5661:
2227          *  o  If loga_length is less than loga_minlength,
2228          *     the metadata server MUST return NFS4ERR_INVAL.
2229          *  o  If the sum of loga_offset and loga_minlength exceeds
2230          *     NFS4_UINT64_MAX, and loga_minlength is not
2231          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2232          *  o  If the sum of loga_offset and loga_length exceeds
2233          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2234          *     the error NFS4ERR_INVAL MUST result.
2235          */
2236         nfserr = nfserr_inval;
2237         if (lgp->lg_seg.length < lgp->lg_minlength ||
2238             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2239              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2240             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2241              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2242                 goto out;
2243         if (lgp->lg_seg.length == 0)
2244                 goto out;
2245
2246         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2247                                                 true, lgp->lg_layout_type, &ls);
2248         if (nfserr) {
2249                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2250                 goto out;
2251         }
2252
2253         nfserr = nfserr_recallconflict;
2254         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2255                 goto out_put_stid;
2256
2257         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2258                                      current_fh, lgp);
2259         if (nfserr)
2260                 goto out_put_stid;
2261
2262         nfserr = nfsd4_insert_layout(lgp, ls);
2263
2264 out_put_stid:
2265         mutex_unlock(&ls->ls_mutex);
2266         nfs4_put_stid(&ls->ls_stid);
2267 out:
2268         return nfserr;
2269 }
2270
2271 static void
2272 nfsd4_layoutget_release(union nfsd4_op_u *u)
2273 {
2274         kfree(u->layoutget.lg_content);
2275 }
2276
2277 static __be32
2278 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2279                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2280 {
2281         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2282         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2283         struct svc_fh *current_fh = &cstate->current_fh;
2284         const struct nfsd4_layout_ops *ops;
2285         loff_t new_size = lcp->lc_last_wr + 1;
2286         struct inode *inode;
2287         struct nfs4_layout_stateid *ls;
2288         __be32 nfserr;
2289
2290         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
2291         if (nfserr)
2292                 goto out;
2293
2294         nfserr = nfserr_layoutunavailable;
2295         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2296         if (!ops)
2297                 goto out;
2298         inode = d_inode(current_fh->fh_dentry);
2299
2300         nfserr = nfserr_inval;
2301         if (new_size <= seg->offset) {
2302                 dprintk("pnfsd: last write before layout segment\n");
2303                 goto out;
2304         }
2305         if (new_size > seg->offset + seg->length) {
2306                 dprintk("pnfsd: last write beyond layout segment\n");
2307                 goto out;
2308         }
2309         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2310                 dprintk("pnfsd: layoutcommit beyond EOF\n");
2311                 goto out;
2312         }
2313
2314         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2315                                                 false, lcp->lc_layout_type,
2316                                                 &ls);
2317         if (nfserr) {
2318                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2319                 /* fixup error code as per RFC5661 */
2320                 if (nfserr == nfserr_bad_stateid)
2321                         nfserr = nfserr_badlayout;
2322                 goto out;
2323         }
2324
2325         /* LAYOUTCOMMIT does not require any serialization */
2326         mutex_unlock(&ls->ls_mutex);
2327
2328         if (new_size > i_size_read(inode)) {
2329                 lcp->lc_size_chg = 1;
2330                 lcp->lc_newsize = new_size;
2331         } else {
2332                 lcp->lc_size_chg = 0;
2333         }
2334
2335         nfserr = ops->proc_layoutcommit(inode, lcp);
2336         nfs4_put_stid(&ls->ls_stid);
2337 out:
2338         return nfserr;
2339 }
2340
2341 static __be32
2342 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2343                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2344 {
2345         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2346         struct svc_fh *current_fh = &cstate->current_fh;
2347         __be32 nfserr;
2348
2349         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2350         if (nfserr)
2351                 goto out;
2352
2353         nfserr = nfserr_layoutunavailable;
2354         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2355                 goto out;
2356
2357         switch (lrp->lr_seg.iomode) {
2358         case IOMODE_READ:
2359         case IOMODE_RW:
2360         case IOMODE_ANY:
2361                 break;
2362         default:
2363                 dprintk("%s: invalid iomode %d\n", __func__,
2364                         lrp->lr_seg.iomode);
2365                 nfserr = nfserr_inval;
2366                 goto out;
2367         }
2368
2369         switch (lrp->lr_return_type) {
2370         case RETURN_FILE:
2371                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2372                 break;
2373         case RETURN_FSID:
2374         case RETURN_ALL:
2375                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2376                 break;
2377         default:
2378                 dprintk("%s: invalid return_type %d\n", __func__,
2379                         lrp->lr_return_type);
2380                 nfserr = nfserr_inval;
2381                 break;
2382         }
2383 out:
2384         return nfserr;
2385 }
2386 #endif /* CONFIG_NFSD_PNFS */
2387
2388 static __be32
2389 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2390                union nfsd4_op_u *u)
2391 {
2392         struct nfsd4_getxattr *getxattr = &u->getxattr;
2393
2394         return nfsd_getxattr(rqstp, &cstate->current_fh,
2395                              getxattr->getxa_name, &getxattr->getxa_buf,
2396                              &getxattr->getxa_len);
2397 }
2398
2399 static __be32
2400 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2401            union nfsd4_op_u *u)
2402 {
2403         struct nfsd4_setxattr *setxattr = &u->setxattr;
2404         __be32 ret;
2405
2406         if (opens_in_grace(SVC_NET(rqstp)))
2407                 return nfserr_grace;
2408
2409         ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2410                             setxattr->setxa_buf, setxattr->setxa_len,
2411                             setxattr->setxa_flags);
2412
2413         if (!ret)
2414                 set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2415
2416         return ret;
2417 }
2418
2419 static __be32
2420 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2421            union nfsd4_op_u *u)
2422 {
2423         /*
2424          * Get the entire list, then copy out only the user attributes
2425          * in the encode function.
2426          */
2427         return nfsd_listxattr(rqstp, &cstate->current_fh,
2428                              &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2429 }
2430
2431 static __be32
2432 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2433            union nfsd4_op_u *u)
2434 {
2435         struct nfsd4_removexattr *removexattr = &u->removexattr;
2436         __be32 ret;
2437
2438         if (opens_in_grace(SVC_NET(rqstp)))
2439                 return nfserr_grace;
2440
2441         ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2442             removexattr->rmxa_name);
2443
2444         if (!ret)
2445                 set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2446
2447         return ret;
2448 }
2449
2450 /*
2451  * NULL call.
2452  */
2453 static __be32
2454 nfsd4_proc_null(struct svc_rqst *rqstp)
2455 {
2456         return rpc_success;
2457 }
2458
2459 static inline void nfsd4_increment_op_stats(u32 opnum)
2460 {
2461         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2462                 percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_NFS4_OP(opnum)]);
2463 }
2464
2465 static const struct nfsd4_operation nfsd4_ops[];
2466
2467 static const char *nfsd4_op_name(unsigned opnum);
2468
2469 /*
2470  * Enforce NFSv4.1 COMPOUND ordering rules:
2471  *
2472  * Also note, enforced elsewhere:
2473  *      - SEQUENCE other than as first op results in
2474  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2475  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
2476  *        (Enforced in nfsd4_bind_conn_to_session().)
2477  *      - DESTROY_SESSION must be the final operation in a compound, if
2478  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2479  *        (Enforced in nfsd4_destroy_session().)
2480  */
2481 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2482 {
2483         struct nfsd4_op *first_op = &args->ops[0];
2484
2485         /* These ordering requirements don't apply to NFSv4.0: */
2486         if (args->minorversion == 0)
2487                 return nfs_ok;
2488         /* This is weird, but OK, not our problem: */
2489         if (args->opcnt == 0)
2490                 return nfs_ok;
2491         if (first_op->status == nfserr_op_illegal)
2492                 return nfs_ok;
2493         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2494                 return nfserr_op_not_in_session;
2495         if (first_op->opnum == OP_SEQUENCE)
2496                 return nfs_ok;
2497         /*
2498          * So first_op is something allowed outside a session, like
2499          * EXCHANGE_ID; but then it has to be the only op in the
2500          * compound:
2501          */
2502         if (args->opcnt != 1)
2503                 return nfserr_not_only_op;
2504         return nfs_ok;
2505 }
2506
2507 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2508 {
2509         return &nfsd4_ops[op->opnum];
2510 }
2511
2512 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2513 {
2514         if (op->opnum == OP_ILLEGAL)
2515                 return false;
2516         return OPDESC(op)->op_flags & OP_CACHEME;
2517 }
2518
2519 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2520 {
2521         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2522         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2523         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2524         struct nfsd4_op *next = &argp->ops[resp->opcnt];
2525         const struct nfsd4_operation *thisd = OPDESC(this);
2526         const struct nfsd4_operation *nextd;
2527
2528         /*
2529          * Most ops check wronsec on our own; only the putfh-like ops
2530          * have special rules.
2531          */
2532         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2533                 return false;
2534         /*
2535          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2536          * put-filehandle operation if we're not going to use the
2537          * result:
2538          */
2539         if (argp->opcnt == resp->opcnt)
2540                 return false;
2541         if (next->opnum == OP_ILLEGAL)
2542                 return false;
2543         nextd = OPDESC(next);
2544         /*
2545          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2546          * errors themselves as necessary; others should check for them
2547          * now:
2548          */
2549         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2550 }
2551
2552 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2553 static void
2554 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2555 {
2556         struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2557         struct nfsd4_copy *copy;
2558         struct nfsd4_putfh *putfh;
2559         int i;
2560
2561         /* traverse all operation and if it's a COPY compound, mark the
2562          * source filehandle to skip verification
2563          */
2564         for (i = 0; i < args->opcnt; i++) {
2565                 op = &args->ops[i];
2566                 if (op->opnum == OP_PUTFH)
2567                         current_op = op;
2568                 else if (op->opnum == OP_SAVEFH)
2569                         saved_op = current_op;
2570                 else if (op->opnum == OP_RESTOREFH)
2571                         current_op = saved_op;
2572                 else if (op->opnum == OP_COPY) {
2573                         copy = (struct nfsd4_copy *)&op->u;
2574                         if (!saved_op) {
2575                                 op->status = nfserr_nofilehandle;
2576                                 return;
2577                         }
2578                         putfh = (struct nfsd4_putfh *)&saved_op->u;
2579                         if (nfsd4_ssc_is_inter(copy))
2580                                 putfh->no_verify = true;
2581                 }
2582         }
2583 }
2584 #else
2585 static void
2586 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2587 {
2588 }
2589 #endif
2590
2591 /*
2592  * COMPOUND call.
2593  */
2594 static __be32
2595 nfsd4_proc_compound(struct svc_rqst *rqstp)
2596 {
2597         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2598         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2599         struct nfsd4_op *op;
2600         struct nfsd4_compound_state *cstate = &resp->cstate;
2601         struct svc_fh *current_fh = &cstate->current_fh;
2602         struct svc_fh *save_fh = &cstate->save_fh;
2603         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2604         __be32          status;
2605
2606         resp->xdr = &rqstp->rq_res_stream;
2607         resp->statusp = resp->xdr->p;
2608
2609         /* reserve space for: NFS status code */
2610         xdr_reserve_space(resp->xdr, XDR_UNIT);
2611
2612         /* reserve space for: taglen, tag, and opcnt */
2613         xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2614         resp->taglen = args->taglen;
2615         resp->tag = args->tag;
2616         resp->rqstp = rqstp;
2617         cstate->minorversion = args->minorversion;
2618         fh_init(current_fh, NFS4_FHSIZE);
2619         fh_init(save_fh, NFS4_FHSIZE);
2620
2621         /*
2622          * Don't use the deferral mechanism for NFSv4; compounds make it
2623          * too hard to avoid non-idempotency problems.
2624          */
2625         __clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2626
2627         /*
2628          * According to RFC3010, this takes precedence over all other errors.
2629          */
2630         status = nfserr_minor_vers_mismatch;
2631         if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2632                 goto out;
2633
2634         status = nfs41_check_op_ordering(args);
2635         if (status) {
2636                 op = &args->ops[0];
2637                 op->status = status;
2638                 resp->opcnt = 1;
2639                 goto encode_op;
2640         }
2641         check_if_stalefh_allowed(args);
2642
2643         rqstp->rq_lease_breaker = (void **)&cstate->clp;
2644
2645         trace_nfsd_compound(rqstp, args->tag, args->taglen, args->client_opcnt);
2646         while (!status && resp->opcnt < args->opcnt) {
2647                 op = &args->ops[resp->opcnt++];
2648
2649                 if (unlikely(resp->opcnt == NFSD_MAX_OPS_PER_COMPOUND)) {
2650                         /* If there are still more operations to process,
2651                          * stop here and report NFS4ERR_RESOURCE. */
2652                         if (cstate->minorversion == 0 &&
2653                             args->client_opcnt > resp->opcnt) {
2654                                 op->status = nfserr_resource;
2655                                 goto encode_op;
2656                         }
2657                 }
2658
2659                 /*
2660                  * The XDR decode routines may have pre-set op->status;
2661                  * for example, if there is a miscellaneous XDR error
2662                  * it will be set to nfserr_bad_xdr.
2663                  */
2664                 if (op->status) {
2665                         if (op->opnum == OP_OPEN)
2666                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2667                         goto encode_op;
2668                 }
2669                 if (!current_fh->fh_dentry &&
2670                                 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2671                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2672                                 op->status = nfserr_nofilehandle;
2673                                 goto encode_op;
2674                         }
2675                 } else if (current_fh->fh_export &&
2676                            current_fh->fh_export->ex_fslocs.migrated &&
2677                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2678                         op->status = nfserr_moved;
2679                         goto encode_op;
2680                 }
2681
2682                 fh_clear_pre_post_attrs(current_fh);
2683
2684                 /* If op is non-idempotent */
2685                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2686                         /*
2687                          * Don't execute this op if we couldn't encode a
2688                          * successful reply:
2689                          */
2690                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2691                         /*
2692                          * Plus if there's another operation, make sure
2693                          * we'll have space to at least encode an error:
2694                          */
2695                         if (resp->opcnt < args->opcnt)
2696                                 plen += COMPOUND_ERR_SLACK_SPACE;
2697                         op->status = nfsd4_check_resp_size(resp, plen);
2698                 }
2699
2700                 if (op->status)
2701                         goto encode_op;
2702
2703                 if (op->opdesc->op_get_currentstateid)
2704                         op->opdesc->op_get_currentstateid(cstate, &op->u);
2705                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2706
2707                 /* Only from SEQUENCE */
2708                 if (cstate->status == nfserr_replay_cache) {
2709                         dprintk("%s NFS4.1 replay from cache\n", __func__);
2710                         status = op->status;
2711                         goto out;
2712                 }
2713                 if (!op->status) {
2714                         if (op->opdesc->op_set_currentstateid)
2715                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
2716
2717                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2718                                 clear_current_stateid(cstate);
2719
2720                         if (current_fh->fh_export &&
2721                                         need_wrongsec_check(rqstp))
2722                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2723                 }
2724 encode_op:
2725                 if (op->status == nfserr_replay_me) {
2726                         op->replay = &cstate->replay_owner->so_replay;
2727                         nfsd4_encode_replay(resp->xdr, op);
2728                         status = op->status = op->replay->rp_status;
2729                 } else {
2730                         nfsd4_encode_operation(resp, op);
2731                         status = op->status;
2732                 }
2733
2734                 trace_nfsd_compound_status(args->client_opcnt, resp->opcnt,
2735                                            status, nfsd4_op_name(op->opnum));
2736
2737                 nfsd4_cstate_clear_replay(cstate);
2738                 nfsd4_increment_op_stats(op->opnum);
2739         }
2740
2741         fh_put(current_fh);
2742         fh_put(save_fh);
2743         BUG_ON(cstate->replay_owner);
2744 out:
2745         cstate->status = status;
2746         /* Reset deferral mechanism for RPC deferrals */
2747         __set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2748         return rpc_success;
2749 }
2750
2751 #define op_encode_hdr_size              (2)
2752 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
2753 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2754 #define op_encode_change_info_maxsz     (5)
2755 #define nfs4_fattr_bitmap_maxsz         (4)
2756
2757 /* We'll fall back on returning no lockowner if run out of space: */
2758 #define op_encode_lockowner_maxsz       (0)
2759 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
2760
2761 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2762
2763 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
2764 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
2765                                          op_encode_ace_maxsz)
2766
2767 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
2768
2769 /*
2770  * The _rsize() helpers are invoked by the NFSv4 COMPOUND decoder, which
2771  * is called before sunrpc sets rq_res.buflen. Thus we have to compute
2772  * the maximum payload size here, based on transport limits and the size
2773  * of the remaining space in the rq_pages array.
2774  */
2775 static u32 nfsd4_max_payload(const struct svc_rqst *rqstp)
2776 {
2777         u32 buflen;
2778
2779         buflen = (rqstp->rq_page_end - rqstp->rq_next_page) * PAGE_SIZE;
2780         buflen -= rqstp->rq_auth_slack;
2781         buflen -= rqstp->rq_res.head[0].iov_len;
2782         return min_t(u32, buflen, svc_max_payload(rqstp));
2783 }
2784
2785 static u32 nfsd4_only_status_rsize(const struct svc_rqst *rqstp,
2786                                    const struct nfsd4_op *op)
2787 {
2788         return (op_encode_hdr_size) * sizeof(__be32);
2789 }
2790
2791 static u32 nfsd4_status_stateid_rsize(const struct svc_rqst *rqstp,
2792                                       const struct nfsd4_op *op)
2793 {
2794         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2795 }
2796
2797 static u32 nfsd4_access_rsize(const struct svc_rqst *rqstp,
2798                               const struct nfsd4_op *op)
2799 {
2800         /* ac_supported, ac_resp_access */
2801         return (op_encode_hdr_size + 2)* sizeof(__be32);
2802 }
2803
2804 static u32 nfsd4_commit_rsize(const struct svc_rqst *rqstp,
2805                               const struct nfsd4_op *op)
2806 {
2807         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2808 }
2809
2810 static u32 nfsd4_create_rsize(const struct svc_rqst *rqstp,
2811                               const struct nfsd4_op *op)
2812 {
2813         return (op_encode_hdr_size + op_encode_change_info_maxsz
2814                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2815 }
2816
2817 /*
2818  * Note since this is an idempotent operation we won't insist on failing
2819  * the op prematurely if the estimate is too large.  We may turn off splice
2820  * reads unnecessarily.
2821  */
2822 static u32 nfsd4_getattr_rsize(const struct svc_rqst *rqstp,
2823                                const struct nfsd4_op *op)
2824 {
2825         const u32 *bmap = op->u.getattr.ga_bmval;
2826         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2827         u32 ret = 0;
2828
2829         if (bmap0 & FATTR4_WORD0_ACL)
2830                 return nfsd4_max_payload(rqstp);
2831         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2832                 return nfsd4_max_payload(rqstp);
2833
2834         if (bmap1 & FATTR4_WORD1_OWNER) {
2835                 ret += IDMAP_NAMESZ + 4;
2836                 bmap1 &= ~FATTR4_WORD1_OWNER;
2837         }
2838         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2839                 ret += IDMAP_NAMESZ + 4;
2840                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2841         }
2842         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2843                 ret += NFS4_FHSIZE + 4;
2844                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2845         }
2846         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2847                 ret += NFS4_MAXLABELLEN + 12;
2848                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2849         }
2850         /*
2851          * Largest of remaining attributes are 16 bytes (e.g.,
2852          * supported_attributes)
2853          */
2854         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2855         /* bitmask, length */
2856         ret += 20;
2857         return ret;
2858 }
2859
2860 static u32 nfsd4_getfh_rsize(const struct svc_rqst *rqstp,
2861                              const struct nfsd4_op *op)
2862 {
2863         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2864 }
2865
2866 static u32 nfsd4_link_rsize(const struct svc_rqst *rqstp,
2867                             const struct nfsd4_op *op)
2868 {
2869         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2870                 * sizeof(__be32);
2871 }
2872
2873 static u32 nfsd4_lock_rsize(const struct svc_rqst *rqstp,
2874                             const struct nfsd4_op *op)
2875 {
2876         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2877                 * sizeof(__be32);
2878 }
2879
2880 static u32 nfsd4_open_rsize(const struct svc_rqst *rqstp,
2881                             const struct nfsd4_op *op)
2882 {
2883         return (op_encode_hdr_size + op_encode_stateid_maxsz
2884                 + op_encode_change_info_maxsz + 1
2885                 + nfs4_fattr_bitmap_maxsz
2886                 + op_encode_delegation_maxsz) * sizeof(__be32);
2887 }
2888
2889 static u32 nfsd4_read_rsize(const struct svc_rqst *rqstp,
2890                             const struct nfsd4_op *op)
2891 {
2892         u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2893
2894         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2895 }
2896
2897 static u32 nfsd4_read_plus_rsize(const struct svc_rqst *rqstp,
2898                                  const struct nfsd4_op *op)
2899 {
2900         u32 rlen = min(op->u.read.rd_length, nfsd4_max_payload(rqstp));
2901         /*
2902          * If we detect that the file changed during hole encoding, then we
2903          * recover by encoding the remaining reply as data. This means we need
2904          * to set aside enough room to encode two data segments.
2905          */
2906         u32 seg_len = 2 * (1 + 2 + 1);
2907
2908         return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2909 }
2910
2911 static u32 nfsd4_readdir_rsize(const struct svc_rqst *rqstp,
2912                                const struct nfsd4_op *op)
2913 {
2914         u32 rlen = min(op->u.readdir.rd_maxcount, nfsd4_max_payload(rqstp));
2915
2916         return (op_encode_hdr_size + op_encode_verifier_maxsz +
2917                 XDR_QUADLEN(rlen)) * sizeof(__be32);
2918 }
2919
2920 static u32 nfsd4_readlink_rsize(const struct svc_rqst *rqstp,
2921                                 const struct nfsd4_op *op)
2922 {
2923         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2924 }
2925
2926 static u32 nfsd4_remove_rsize(const struct svc_rqst *rqstp,
2927                               const struct nfsd4_op *op)
2928 {
2929         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2930                 * sizeof(__be32);
2931 }
2932
2933 static u32 nfsd4_rename_rsize(const struct svc_rqst *rqstp,
2934                               const struct nfsd4_op *op)
2935 {
2936         return (op_encode_hdr_size + op_encode_change_info_maxsz
2937                 + op_encode_change_info_maxsz) * sizeof(__be32);
2938 }
2939
2940 static u32 nfsd4_sequence_rsize(const struct svc_rqst *rqstp,
2941                                 const struct nfsd4_op *op)
2942 {
2943         return (op_encode_hdr_size
2944                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2945 }
2946
2947 static u32 nfsd4_test_stateid_rsize(const struct svc_rqst *rqstp,
2948                                     const struct nfsd4_op *op)
2949 {
2950         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2951                 * sizeof(__be32);
2952 }
2953
2954 static u32 nfsd4_setattr_rsize(const struct svc_rqst *rqstp,
2955                                const struct nfsd4_op *op)
2956 {
2957         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2958 }
2959
2960 static u32 nfsd4_secinfo_rsize(const struct svc_rqst *rqstp,
2961                                const struct nfsd4_op *op)
2962 {
2963         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2964                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2965 }
2966
2967 static u32 nfsd4_setclientid_rsize(const struct svc_rqst *rqstp,
2968                                    const struct nfsd4_op *op)
2969 {
2970         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2971                                                                 sizeof(__be32);
2972 }
2973
2974 static u32 nfsd4_write_rsize(const struct svc_rqst *rqstp,
2975                              const struct nfsd4_op *op)
2976 {
2977         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2978 }
2979
2980 static u32 nfsd4_exchange_id_rsize(const struct svc_rqst *rqstp,
2981                                    const struct nfsd4_op *op)
2982 {
2983         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2984                 1 + 1 + /* eir_flags, spr_how */\
2985                 4 + /* spo_must_enforce & _allow with bitmap */\
2986                 2 + /*eir_server_owner.so_minor_id */\
2987                 /* eir_server_owner.so_major_id<> */\
2988                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2989                 /* eir_server_scope<> */\
2990                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2991                 1 + /* eir_server_impl_id array length */\
2992                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2993 }
2994
2995 static u32 nfsd4_bind_conn_to_session_rsize(const struct svc_rqst *rqstp,
2996                                             const struct nfsd4_op *op)
2997 {
2998         return (op_encode_hdr_size + \
2999                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
3000                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
3001 }
3002
3003 static u32 nfsd4_create_session_rsize(const struct svc_rqst *rqstp,
3004                                       const struct nfsd4_op *op)
3005 {
3006         return (op_encode_hdr_size + \
3007                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
3008                 2 + /* csr_sequence, csr_flags */\
3009                 op_encode_channel_attrs_maxsz + \
3010                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
3011 }
3012
3013 static u32 nfsd4_copy_rsize(const struct svc_rqst *rqstp,
3014                             const struct nfsd4_op *op)
3015 {
3016         return (op_encode_hdr_size +
3017                 1 /* wr_callback */ +
3018                 op_encode_stateid_maxsz /* wr_callback */ +
3019                 2 /* wr_count */ +
3020                 1 /* wr_committed */ +
3021                 op_encode_verifier_maxsz +
3022                 1 /* cr_consecutive */ +
3023                 1 /* cr_synchronous */) * sizeof(__be32);
3024 }
3025
3026 static u32 nfsd4_offload_status_rsize(const struct svc_rqst *rqstp,
3027                                       const struct nfsd4_op *op)
3028 {
3029         return (op_encode_hdr_size +
3030                 2 /* osr_count */ +
3031                 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3032 }
3033
3034 static u32 nfsd4_copy_notify_rsize(const struct svc_rqst *rqstp,
3035                                    const struct nfsd4_op *op)
3036 {
3037         return (op_encode_hdr_size +
3038                 3 /* cnr_lease_time */ +
3039                 1 /* We support one cnr_source_server */ +
3040                 1 /* cnr_stateid seq */ +
3041                 op_encode_stateid_maxsz /* cnr_stateid */ +
3042                 1 /* num cnr_source_server*/ +
3043                 1 /* nl4_type */ +
3044                 1 /* nl4 size */ +
3045                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3046                 * sizeof(__be32);
3047 }
3048
3049 #ifdef CONFIG_NFSD_PNFS
3050 static u32 nfsd4_getdeviceinfo_rsize(const struct svc_rqst *rqstp,
3051                                      const struct nfsd4_op *op)
3052 {
3053         u32 rlen = min(op->u.getdeviceinfo.gd_maxcount, nfsd4_max_payload(rqstp));
3054
3055         return (op_encode_hdr_size +
3056                 1 /* gd_layout_type*/ +
3057                 XDR_QUADLEN(rlen) +
3058                 2 /* gd_notify_types */) * sizeof(__be32);
3059 }
3060
3061 /*
3062  * At this stage we don't really know what layout driver will handle the request,
3063  * so we need to define an arbitrary upper bound here.
3064  */
3065 #define MAX_LAYOUT_SIZE         128
3066 static u32 nfsd4_layoutget_rsize(const struct svc_rqst *rqstp,
3067                                  const struct nfsd4_op *op)
3068 {
3069         return (op_encode_hdr_size +
3070                 1 /* logr_return_on_close */ +
3071                 op_encode_stateid_maxsz +
3072                 1 /* nr of layouts */ +
3073                 MAX_LAYOUT_SIZE) * sizeof(__be32);
3074 }
3075
3076 static u32 nfsd4_layoutcommit_rsize(const struct svc_rqst *rqstp,
3077                                     const struct nfsd4_op *op)
3078 {
3079         return (op_encode_hdr_size +
3080                 1 /* locr_newsize */ +
3081                 2 /* ns_size */) * sizeof(__be32);
3082 }
3083
3084 static u32 nfsd4_layoutreturn_rsize(const struct svc_rqst *rqstp,
3085                                     const struct nfsd4_op *op)
3086 {
3087         return (op_encode_hdr_size +
3088                 1 /* lrs_stateid */ +
3089                 op_encode_stateid_maxsz) * sizeof(__be32);
3090 }
3091 #endif /* CONFIG_NFSD_PNFS */
3092
3093
3094 static u32 nfsd4_seek_rsize(const struct svc_rqst *rqstp,
3095                             const struct nfsd4_op *op)
3096 {
3097         return (op_encode_hdr_size + 3) * sizeof(__be32);
3098 }
3099
3100 static u32 nfsd4_getxattr_rsize(const struct svc_rqst *rqstp,
3101                                 const struct nfsd4_op *op)
3102 {
3103         u32 rlen = min_t(u32, XATTR_SIZE_MAX, nfsd4_max_payload(rqstp));
3104
3105         return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3106 }
3107
3108 static u32 nfsd4_setxattr_rsize(const struct svc_rqst *rqstp,
3109                                 const struct nfsd4_op *op)
3110 {
3111         return (op_encode_hdr_size + op_encode_change_info_maxsz)
3112                 * sizeof(__be32);
3113 }
3114 static u32 nfsd4_listxattrs_rsize(const struct svc_rqst *rqstp,
3115                                   const struct nfsd4_op *op)
3116 {
3117         u32 rlen = min(op->u.listxattrs.lsxa_maxcount, nfsd4_max_payload(rqstp));
3118
3119         return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3120 }
3121
3122 static u32 nfsd4_removexattr_rsize(const struct svc_rqst *rqstp,
3123                                    const struct nfsd4_op *op)
3124 {
3125         return (op_encode_hdr_size + op_encode_change_info_maxsz)
3126                 * sizeof(__be32);
3127 }
3128
3129
3130 static const struct nfsd4_operation nfsd4_ops[] = {
3131         [OP_ACCESS] = {
3132                 .op_func = nfsd4_access,
3133                 .op_name = "OP_ACCESS",
3134                 .op_rsize_bop = nfsd4_access_rsize,
3135         },
3136         [OP_CLOSE] = {
3137                 .op_func = nfsd4_close,
3138                 .op_flags = OP_MODIFIES_SOMETHING,
3139                 .op_name = "OP_CLOSE",
3140                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3141                 .op_get_currentstateid = nfsd4_get_closestateid,
3142                 .op_set_currentstateid = nfsd4_set_closestateid,
3143         },
3144         [OP_COMMIT] = {
3145                 .op_func = nfsd4_commit,
3146                 .op_flags = OP_MODIFIES_SOMETHING,
3147                 .op_name = "OP_COMMIT",
3148                 .op_rsize_bop = nfsd4_commit_rsize,
3149         },
3150         [OP_CREATE] = {
3151                 .op_func = nfsd4_create,
3152                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3153                 .op_name = "OP_CREATE",
3154                 .op_rsize_bop = nfsd4_create_rsize,
3155         },
3156         [OP_DELEGRETURN] = {
3157                 .op_func = nfsd4_delegreturn,
3158                 .op_flags = OP_MODIFIES_SOMETHING,
3159                 .op_name = "OP_DELEGRETURN",
3160                 .op_rsize_bop = nfsd4_only_status_rsize,
3161                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
3162         },
3163         [OP_GETATTR] = {
3164                 .op_func = nfsd4_getattr,
3165                 .op_flags = ALLOWED_ON_ABSENT_FS,
3166                 .op_rsize_bop = nfsd4_getattr_rsize,
3167                 .op_name = "OP_GETATTR",
3168         },
3169         [OP_GETFH] = {
3170                 .op_func = nfsd4_getfh,
3171                 .op_name = "OP_GETFH",
3172                 .op_rsize_bop = nfsd4_getfh_rsize,
3173         },
3174         [OP_LINK] = {
3175                 .op_func = nfsd4_link,
3176                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3177                                 | OP_CACHEME,
3178                 .op_name = "OP_LINK",
3179                 .op_rsize_bop = nfsd4_link_rsize,
3180         },
3181         [OP_LOCK] = {
3182                 .op_func = nfsd4_lock,
3183                 .op_flags = OP_MODIFIES_SOMETHING |
3184                                 OP_NONTRIVIAL_ERROR_ENCODE,
3185                 .op_name = "OP_LOCK",
3186                 .op_rsize_bop = nfsd4_lock_rsize,
3187                 .op_set_currentstateid = nfsd4_set_lockstateid,
3188         },
3189         [OP_LOCKT] = {
3190                 .op_func = nfsd4_lockt,
3191                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3192                 .op_name = "OP_LOCKT",
3193                 .op_rsize_bop = nfsd4_lock_rsize,
3194         },
3195         [OP_LOCKU] = {
3196                 .op_func = nfsd4_locku,
3197                 .op_flags = OP_MODIFIES_SOMETHING,
3198                 .op_name = "OP_LOCKU",
3199                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3200                 .op_get_currentstateid = nfsd4_get_lockustateid,
3201         },
3202         [OP_LOOKUP] = {
3203                 .op_func = nfsd4_lookup,
3204                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3205                 .op_name = "OP_LOOKUP",
3206                 .op_rsize_bop = nfsd4_only_status_rsize,
3207         },
3208         [OP_LOOKUPP] = {
3209                 .op_func = nfsd4_lookupp,
3210                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3211                 .op_name = "OP_LOOKUPP",
3212                 .op_rsize_bop = nfsd4_only_status_rsize,
3213         },
3214         [OP_NVERIFY] = {
3215                 .op_func = nfsd4_nverify,
3216                 .op_name = "OP_NVERIFY",
3217                 .op_rsize_bop = nfsd4_only_status_rsize,
3218         },
3219         [OP_OPEN] = {
3220                 .op_func = nfsd4_open,
3221                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3222                 .op_name = "OP_OPEN",
3223                 .op_rsize_bop = nfsd4_open_rsize,
3224                 .op_set_currentstateid = nfsd4_set_openstateid,
3225         },
3226         [OP_OPEN_CONFIRM] = {
3227                 .op_func = nfsd4_open_confirm,
3228                 .op_flags = OP_MODIFIES_SOMETHING,
3229                 .op_name = "OP_OPEN_CONFIRM",
3230                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3231         },
3232         [OP_OPEN_DOWNGRADE] = {
3233                 .op_func = nfsd4_open_downgrade,
3234                 .op_flags = OP_MODIFIES_SOMETHING,
3235                 .op_name = "OP_OPEN_DOWNGRADE",
3236                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3237                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
3238                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
3239         },
3240         [OP_PUTFH] = {
3241                 .op_func = nfsd4_putfh,
3242                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3243                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3244                 .op_name = "OP_PUTFH",
3245                 .op_rsize_bop = nfsd4_only_status_rsize,
3246         },
3247         [OP_PUTPUBFH] = {
3248                 .op_func = nfsd4_putrootfh,
3249                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3250                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3251                 .op_name = "OP_PUTPUBFH",
3252                 .op_rsize_bop = nfsd4_only_status_rsize,
3253         },
3254         [OP_PUTROOTFH] = {
3255                 .op_func = nfsd4_putrootfh,
3256                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3257                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3258                 .op_name = "OP_PUTROOTFH",
3259                 .op_rsize_bop = nfsd4_only_status_rsize,
3260         },
3261         [OP_READ] = {
3262                 .op_func = nfsd4_read,
3263                 .op_release = nfsd4_read_release,
3264                 .op_name = "OP_READ",
3265                 .op_rsize_bop = nfsd4_read_rsize,
3266                 .op_get_currentstateid = nfsd4_get_readstateid,
3267         },
3268         [OP_READDIR] = {
3269                 .op_func = nfsd4_readdir,
3270                 .op_name = "OP_READDIR",
3271                 .op_rsize_bop = nfsd4_readdir_rsize,
3272         },
3273         [OP_READLINK] = {
3274                 .op_func = nfsd4_readlink,
3275                 .op_name = "OP_READLINK",
3276                 .op_rsize_bop = nfsd4_readlink_rsize,
3277         },
3278         [OP_REMOVE] = {
3279                 .op_func = nfsd4_remove,
3280                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3281                 .op_name = "OP_REMOVE",
3282                 .op_rsize_bop = nfsd4_remove_rsize,
3283         },
3284         [OP_RENAME] = {
3285                 .op_func = nfsd4_rename,
3286                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3287                 .op_name = "OP_RENAME",
3288                 .op_rsize_bop = nfsd4_rename_rsize,
3289         },
3290         [OP_RENEW] = {
3291                 .op_func = nfsd4_renew,
3292                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3293                                 | OP_MODIFIES_SOMETHING,
3294                 .op_name = "OP_RENEW",
3295                 .op_rsize_bop = nfsd4_only_status_rsize,
3296
3297         },
3298         [OP_RESTOREFH] = {
3299                 .op_func = nfsd4_restorefh,
3300                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3301                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3302                 .op_name = "OP_RESTOREFH",
3303                 .op_rsize_bop = nfsd4_only_status_rsize,
3304         },
3305         [OP_SAVEFH] = {
3306                 .op_func = nfsd4_savefh,
3307                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3308                 .op_name = "OP_SAVEFH",
3309                 .op_rsize_bop = nfsd4_only_status_rsize,
3310         },
3311         [OP_SECINFO] = {
3312                 .op_func = nfsd4_secinfo,
3313                 .op_release = nfsd4_secinfo_release,
3314                 .op_flags = OP_HANDLES_WRONGSEC,
3315                 .op_name = "OP_SECINFO",
3316                 .op_rsize_bop = nfsd4_secinfo_rsize,
3317         },
3318         [OP_SETATTR] = {
3319                 .op_func = nfsd4_setattr,
3320                 .op_name = "OP_SETATTR",
3321                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3322                                 | OP_NONTRIVIAL_ERROR_ENCODE,
3323                 .op_rsize_bop = nfsd4_setattr_rsize,
3324                 .op_get_currentstateid = nfsd4_get_setattrstateid,
3325         },
3326         [OP_SETCLIENTID] = {
3327                 .op_func = nfsd4_setclientid,
3328                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3329                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
3330                                 | OP_NONTRIVIAL_ERROR_ENCODE,
3331                 .op_name = "OP_SETCLIENTID",
3332                 .op_rsize_bop = nfsd4_setclientid_rsize,
3333         },
3334         [OP_SETCLIENTID_CONFIRM] = {
3335                 .op_func = nfsd4_setclientid_confirm,
3336                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3337                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
3338                 .op_name = "OP_SETCLIENTID_CONFIRM",
3339                 .op_rsize_bop = nfsd4_only_status_rsize,
3340         },
3341         [OP_VERIFY] = {
3342                 .op_func = nfsd4_verify,
3343                 .op_name = "OP_VERIFY",
3344                 .op_rsize_bop = nfsd4_only_status_rsize,
3345         },
3346         [OP_WRITE] = {
3347                 .op_func = nfsd4_write,
3348                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3349                 .op_name = "OP_WRITE",
3350                 .op_rsize_bop = nfsd4_write_rsize,
3351                 .op_get_currentstateid = nfsd4_get_writestateid,
3352         },
3353         [OP_RELEASE_LOCKOWNER] = {
3354                 .op_func = nfsd4_release_lockowner,
3355                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3356                                 | OP_MODIFIES_SOMETHING,
3357                 .op_name = "OP_RELEASE_LOCKOWNER",
3358                 .op_rsize_bop = nfsd4_only_status_rsize,
3359         },
3360
3361         /* NFSv4.1 operations */
3362         [OP_EXCHANGE_ID] = {
3363                 .op_func = nfsd4_exchange_id,
3364                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3365                                 | OP_MODIFIES_SOMETHING,
3366                 .op_name = "OP_EXCHANGE_ID",
3367                 .op_rsize_bop = nfsd4_exchange_id_rsize,
3368         },
3369         [OP_BACKCHANNEL_CTL] = {
3370                 .op_func = nfsd4_backchannel_ctl,
3371                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3372                 .op_name = "OP_BACKCHANNEL_CTL",
3373                 .op_rsize_bop = nfsd4_only_status_rsize,
3374         },
3375         [OP_BIND_CONN_TO_SESSION] = {
3376                 .op_func = nfsd4_bind_conn_to_session,
3377                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3378                                 | OP_MODIFIES_SOMETHING,
3379                 .op_name = "OP_BIND_CONN_TO_SESSION",
3380                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3381         },
3382         [OP_CREATE_SESSION] = {
3383                 .op_func = nfsd4_create_session,
3384                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3385                                 | OP_MODIFIES_SOMETHING,
3386                 .op_name = "OP_CREATE_SESSION",
3387                 .op_rsize_bop = nfsd4_create_session_rsize,
3388         },
3389         [OP_DESTROY_SESSION] = {
3390                 .op_func = nfsd4_destroy_session,
3391                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3392                                 | OP_MODIFIES_SOMETHING,
3393                 .op_name = "OP_DESTROY_SESSION",
3394                 .op_rsize_bop = nfsd4_only_status_rsize,
3395         },
3396         [OP_SEQUENCE] = {
3397                 .op_func = nfsd4_sequence,
3398                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3399                 .op_name = "OP_SEQUENCE",
3400                 .op_rsize_bop = nfsd4_sequence_rsize,
3401         },
3402         [OP_DESTROY_CLIENTID] = {
3403                 .op_func = nfsd4_destroy_clientid,
3404                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3405                                 | OP_MODIFIES_SOMETHING,
3406                 .op_name = "OP_DESTROY_CLIENTID",
3407                 .op_rsize_bop = nfsd4_only_status_rsize,
3408         },
3409         [OP_RECLAIM_COMPLETE] = {
3410                 .op_func = nfsd4_reclaim_complete,
3411                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3412                 .op_name = "OP_RECLAIM_COMPLETE",
3413                 .op_rsize_bop = nfsd4_only_status_rsize,
3414         },
3415         [OP_SECINFO_NO_NAME] = {
3416                 .op_func = nfsd4_secinfo_no_name,
3417                 .op_release = nfsd4_secinfo_no_name_release,
3418                 .op_flags = OP_HANDLES_WRONGSEC,
3419                 .op_name = "OP_SECINFO_NO_NAME",
3420                 .op_rsize_bop = nfsd4_secinfo_rsize,
3421         },
3422         [OP_TEST_STATEID] = {
3423                 .op_func = nfsd4_test_stateid,
3424                 .op_flags = ALLOWED_WITHOUT_FH,
3425                 .op_name = "OP_TEST_STATEID",
3426                 .op_rsize_bop = nfsd4_test_stateid_rsize,
3427         },
3428         [OP_FREE_STATEID] = {
3429                 .op_func = nfsd4_free_stateid,
3430                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3431                 .op_name = "OP_FREE_STATEID",
3432                 .op_get_currentstateid = nfsd4_get_freestateid,
3433                 .op_rsize_bop = nfsd4_only_status_rsize,
3434         },
3435 #ifdef CONFIG_NFSD_PNFS
3436         [OP_GETDEVICEINFO] = {
3437                 .op_func = nfsd4_getdeviceinfo,
3438                 .op_release = nfsd4_getdeviceinfo_release,
3439                 .op_flags = ALLOWED_WITHOUT_FH,
3440                 .op_name = "OP_GETDEVICEINFO",
3441                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3442         },
3443         [OP_LAYOUTGET] = {
3444                 .op_func = nfsd4_layoutget,
3445                 .op_release = nfsd4_layoutget_release,
3446                 .op_flags = OP_MODIFIES_SOMETHING,
3447                 .op_name = "OP_LAYOUTGET",
3448                 .op_rsize_bop = nfsd4_layoutget_rsize,
3449         },
3450         [OP_LAYOUTCOMMIT] = {
3451                 .op_func = nfsd4_layoutcommit,
3452                 .op_flags = OP_MODIFIES_SOMETHING,
3453                 .op_name = "OP_LAYOUTCOMMIT",
3454                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3455         },
3456         [OP_LAYOUTRETURN] = {
3457                 .op_func = nfsd4_layoutreturn,
3458                 .op_flags = OP_MODIFIES_SOMETHING,
3459                 .op_name = "OP_LAYOUTRETURN",
3460                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3461         },
3462 #endif /* CONFIG_NFSD_PNFS */
3463
3464         /* NFSv4.2 operations */
3465         [OP_ALLOCATE] = {
3466                 .op_func = nfsd4_allocate,
3467                 .op_flags = OP_MODIFIES_SOMETHING,
3468                 .op_name = "OP_ALLOCATE",
3469                 .op_rsize_bop = nfsd4_only_status_rsize,
3470         },
3471         [OP_DEALLOCATE] = {
3472                 .op_func = nfsd4_deallocate,
3473                 .op_flags = OP_MODIFIES_SOMETHING,
3474                 .op_name = "OP_DEALLOCATE",
3475                 .op_rsize_bop = nfsd4_only_status_rsize,
3476         },
3477         [OP_CLONE] = {
3478                 .op_func = nfsd4_clone,
3479                 .op_flags = OP_MODIFIES_SOMETHING,
3480                 .op_name = "OP_CLONE",
3481                 .op_rsize_bop = nfsd4_only_status_rsize,
3482         },
3483         [OP_COPY] = {
3484                 .op_func = nfsd4_copy,
3485                 .op_flags = OP_MODIFIES_SOMETHING,
3486                 .op_name = "OP_COPY",
3487                 .op_rsize_bop = nfsd4_copy_rsize,
3488         },
3489         [OP_READ_PLUS] = {
3490                 .op_func = nfsd4_read,
3491                 .op_release = nfsd4_read_release,
3492                 .op_name = "OP_READ_PLUS",
3493                 .op_rsize_bop = nfsd4_read_plus_rsize,
3494                 .op_get_currentstateid = nfsd4_get_readstateid,
3495         },
3496         [OP_SEEK] = {
3497                 .op_func = nfsd4_seek,
3498                 .op_name = "OP_SEEK",
3499                 .op_rsize_bop = nfsd4_seek_rsize,
3500         },
3501         [OP_OFFLOAD_STATUS] = {
3502                 .op_func = nfsd4_offload_status,
3503                 .op_name = "OP_OFFLOAD_STATUS",
3504                 .op_rsize_bop = nfsd4_offload_status_rsize,
3505         },
3506         [OP_OFFLOAD_CANCEL] = {
3507                 .op_func = nfsd4_offload_cancel,
3508                 .op_flags = OP_MODIFIES_SOMETHING,
3509                 .op_name = "OP_OFFLOAD_CANCEL",
3510                 .op_rsize_bop = nfsd4_only_status_rsize,
3511         },
3512         [OP_COPY_NOTIFY] = {
3513                 .op_func = nfsd4_copy_notify,
3514                 .op_flags = OP_MODIFIES_SOMETHING,
3515                 .op_name = "OP_COPY_NOTIFY",
3516                 .op_rsize_bop = nfsd4_copy_notify_rsize,
3517         },
3518         [OP_GETXATTR] = {
3519                 .op_func = nfsd4_getxattr,
3520                 .op_name = "OP_GETXATTR",
3521                 .op_rsize_bop = nfsd4_getxattr_rsize,
3522         },
3523         [OP_SETXATTR] = {
3524                 .op_func = nfsd4_setxattr,
3525                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3526                 .op_name = "OP_SETXATTR",
3527                 .op_rsize_bop = nfsd4_setxattr_rsize,
3528         },
3529         [OP_LISTXATTRS] = {
3530                 .op_func = nfsd4_listxattrs,
3531                 .op_name = "OP_LISTXATTRS",
3532                 .op_rsize_bop = nfsd4_listxattrs_rsize,
3533         },
3534         [OP_REMOVEXATTR] = {
3535                 .op_func = nfsd4_removexattr,
3536                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3537                 .op_name = "OP_REMOVEXATTR",
3538                 .op_rsize_bop = nfsd4_removexattr_rsize,
3539         },
3540 };
3541
3542 /**
3543  * nfsd4_spo_must_allow - Determine if the compound op contains an
3544  * operation that is allowed to be sent with machine credentials
3545  *
3546  * @rqstp: a pointer to the struct svc_rqst
3547  *
3548  * Checks to see if the compound contains a spo_must_allow op
3549  * and confirms that it was sent with the proper machine creds.
3550  */
3551
3552 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3553 {
3554         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3555         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3556         struct nfsd4_op *this;
3557         struct nfsd4_compound_state *cstate = &resp->cstate;
3558         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3559         u32 opiter;
3560
3561         if (!cstate->minorversion)
3562                 return false;
3563
3564         if (cstate->spo_must_allowed)
3565                 return true;
3566
3567         opiter = resp->opcnt;
3568         while (opiter < argp->opcnt) {
3569                 this = &argp->ops[opiter++];
3570                 if (test_bit(this->opnum, allow->u.longs) &&
3571                         cstate->clp->cl_mach_cred &&
3572                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3573                         cstate->spo_must_allowed = true;
3574                         return true;
3575                 }
3576         }
3577         cstate->spo_must_allowed = false;
3578         return false;
3579 }
3580
3581 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3582 {
3583         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3584                 return op_encode_hdr_size * sizeof(__be32);
3585
3586         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3587         return OPDESC(op)->op_rsize_bop(rqstp, op);
3588 }
3589
3590 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3591 {
3592         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3593                 pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3594                         op->opnum, nfsd4_op_name(op->opnum));
3595                 WARN_ON_ONCE(1);
3596         }
3597 }
3598
3599 static const char *nfsd4_op_name(unsigned opnum)
3600 {
3601         if (opnum < ARRAY_SIZE(nfsd4_ops))
3602                 return nfsd4_ops[opnum].op_name;
3603         return "unknown_operation";
3604 }
3605
3606 static const struct svc_procedure nfsd_procedures4[2] = {
3607         [NFSPROC4_NULL] = {
3608                 .pc_func = nfsd4_proc_null,
3609                 .pc_decode = nfssvc_decode_voidarg,
3610                 .pc_encode = nfssvc_encode_voidres,
3611                 .pc_argsize = sizeof(struct nfsd_voidargs),
3612                 .pc_argzero = sizeof(struct nfsd_voidargs),
3613                 .pc_ressize = sizeof(struct nfsd_voidres),
3614                 .pc_cachetype = RC_NOCACHE,
3615                 .pc_xdrressize = 1,
3616                 .pc_name = "NULL",
3617         },
3618         [NFSPROC4_COMPOUND] = {
3619                 .pc_func = nfsd4_proc_compound,
3620                 .pc_decode = nfs4svc_decode_compoundargs,
3621                 .pc_encode = nfs4svc_encode_compoundres,
3622                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3623                 .pc_argzero = offsetof(struct nfsd4_compoundargs, iops),
3624                 .pc_ressize = sizeof(struct nfsd4_compoundres),
3625                 .pc_release = nfsd4_release_compoundargs,
3626                 .pc_cachetype = RC_NOCACHE,
3627                 .pc_xdrressize = NFSD_BUFSIZE/4,
3628                 .pc_name = "COMPOUND",
3629         },
3630 };
3631
3632 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
3633 const struct svc_version nfsd_version4 = {
3634         .vs_vers                = 4,
3635         .vs_nproc               = 2,
3636         .vs_proc                = nfsd_procedures4,
3637         .vs_count               = nfsd_count3,
3638         .vs_dispatch            = nfsd_dispatch,
3639         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
3640         .vs_rpcb_optnl          = true,
3641         .vs_need_cong_ctrl      = true,
3642 };