fs/nfsd/nfsproc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Process version 2 NFS requests.
   4  *
   5  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/namei.h>
   9
  10 #include "cache.h"
  11 #include "xdr.h"
  12 #include "vfs.h"
  13
  14 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  15
  16 static __be32 nfsd_map_status(__be32 status)
  17 {
  18         switch (status) {
  19         case nfs_ok:
  20                 break;
  21         case nfserr_nofilehandle:
  22         case nfserr_badhandle:
  23                 status = nfserr_stale;
  24                 break;
  25         case nfserr_wrongsec:
  26         case nfserr_xdev:
  27         case nfserr_file_open:
  28                 status = nfserr_acces;
  29                 break;
  30         case nfserr_symlink_not_dir:
  31                 status = nfserr_notdir;
  32                 break;
  33         case nfserr_symlink:
  34         case nfserr_wrong_type:
  35                 status = nfserr_inval;
  36                 break;
  37         }
  38         return status;
  39 }
  40
  41 static __be32
  42 nfsd_proc_null(struct svc_rqst *rqstp)
  43 {
  44         return rpc_success;
  45 }
  46
  47 /*
  48  * Get a file's attributes
  49  * N.B. After this call resp->fh needs an fh_put
  50  */
  51 static __be32
  52 nfsd_proc_getattr(struct svc_rqst *rqstp)
  53 {
  54         struct nfsd_fhandle *argp = rqstp->rq_argp;
  55         struct nfsd_attrstat *resp = rqstp->rq_resp;
  56
  57         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
  58
  59         fh_copy(&resp->fh, &argp->fh);
  60         resp->status = fh_verify(rqstp, &resp->fh, 0,
  61                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  62         if (resp->status != nfs_ok)
  63                 goto out;
  64         resp->status = fh_getattr(&resp->fh, &resp->stat);
  65 out:
  66         resp->status = nfsd_map_status(resp->status);
  67         return rpc_success;
  68 }
  69
  70 /*
  71  * Set a file's attributes
  72  * N.B. After this call resp->fh needs an fh_put
  73  */
  74 static __be32
  75 nfsd_proc_setattr(struct svc_rqst *rqstp)
  76 {
  77         struct nfsd_sattrargs *argp = rqstp->rq_argp;
  78         struct nfsd_attrstat *resp = rqstp->rq_resp;
  79         struct iattr *iap = &argp->attrs;
  80         struct nfsd_attrs attrs = {
  81                 .na_iattr       = iap,
  82         };
  83         struct svc_fh *fhp;
  84
  85         dprintk("nfsd: SETATTR  %s, valid=%x, size=%ld\n",
  86                 SVCFH_fmt(&argp->fh),
  87                 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
  88
  89         fhp = fh_copy(&resp->fh, &argp->fh);
  90
  91         /*
  92          * NFSv2 does not differentiate between "set-[ac]time-to-now"
  93          * which only requires access, and "set-[ac]time-to-X" which
  94          * requires ownership.
  95          * So if it looks like it might be "set both to the same time which
  96          * is close to now", and if setattr_prepare fails, then we
  97          * convert to "set to now" instead of "set to explicit time"
  98          *
  99          * We only call setattr_prepare as the last test as technically
 100          * it is not an interface that we should be using.
 101          */
 102 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
 103 #define MAX_TOUCH_TIME_ERROR (30*60)
 104         if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
 105             iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
 106                 /*
 107                  * Looks probable.
 108                  *
 109                  * Now just make sure time is in the right ballpark.
 110                  * Solaris, at least, doesn't seem to care what the time
 111                  * request is.  We require it be within 30 minutes of now.
 112                  */
 113                 time64_t delta = iap->ia_atime.tv_sec - ktime_get_real_seconds();
 114
 115                 resp->status = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
 116                 if (resp->status != nfs_ok)
 117                         goto out;
 118
 119                 if (delta < 0)
 120                         delta = -delta;
 121                 if (delta < MAX_TOUCH_TIME_ERROR &&
 122                     setattr_prepare(&nop_mnt_idmap, fhp->fh_dentry, iap) != 0) {
 123                         /*
 124                          * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
 125                          * This will cause notify_change to set these times
 126                          * to "now"
 127                          */
 128                         iap->ia_valid &= ~BOTH_TIME_SET;
 129                 }
 130         }
 131
 132         resp->status = nfsd_setattr(rqstp, fhp, &attrs, NULL);
 133         if (resp->status != nfs_ok)
 134                 goto out;
 135
 136         resp->status = fh_getattr(&resp->fh, &resp->stat);
 137 out:
 138         resp->status = nfsd_map_status(resp->status);
 139         return rpc_success;
 140 }
 141
 142 /* Obsolete, replaced by MNTPROC_MNT. */
 143 static __be32
 144 nfsd_proc_root(struct svc_rqst *rqstp)
 145 {
 146         return rpc_success;
 147 }
 148
 149 /*
 150  * Look up a path name component
 151  * Note: the dentry in the resp->fh may be negative if the file
 152  * doesn't exist yet.
 153  * N.B. After this call resp->fh needs an fh_put
 154  */
 155 static __be32
 156 nfsd_proc_lookup(struct svc_rqst *rqstp)
 157 {
 158         struct nfsd_diropargs *argp = rqstp->rq_argp;
 159         struct nfsd_diropres *resp = rqstp->rq_resp;
 160
 161         dprintk("nfsd: LOOKUP   %s %.*s\n",
 162                 SVCFH_fmt(&argp->fh), argp->len, argp->name);
 163
 164         fh_init(&resp->fh, NFS_FHSIZE);
 165         resp->status = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
 166                                    &resp->fh);
 167         fh_put(&argp->fh);
 168         if (resp->status != nfs_ok)
 169                 goto out;
 170
 171         resp->status = fh_getattr(&resp->fh, &resp->stat);
 172 out:
 173         resp->status = nfsd_map_status(resp->status);
 174         return rpc_success;
 175 }
 176
 177 /*
 178  * Read a symlink.
 179  */
 180 static __be32
 181 nfsd_proc_readlink(struct svc_rqst *rqstp)
 182 {
 183         struct nfsd_fhandle *argp = rqstp->rq_argp;
 184         struct nfsd_readlinkres *resp = rqstp->rq_resp;
 185
 186         dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
 187
 188         /* Read the symlink. */
 189         resp->len = NFS_MAXPATHLEN;
 190         resp->page = *(rqstp->rq_next_page++);
 191         resp->status = nfsd_readlink(rqstp, &argp->fh,
 192                                      page_address(resp->page), &resp->len);
 193
 194         fh_put(&argp->fh);
 195         resp->status = nfsd_map_status(resp->status);
 196         return rpc_success;
 197 }
 198
 199 /*
 200  * Read a portion of a file.
 201  * N.B. After this call resp->fh needs an fh_put
 202  */
 203 static __be32
 204 nfsd_proc_read(struct svc_rqst *rqstp)
 205 {
 206         struct nfsd_readargs *argp = rqstp->rq_argp;
 207         struct nfsd_readres *resp = rqstp->rq_resp;
 208         u32 eof;
 209
 210         dprintk("nfsd: READ    %s %d bytes at %d\n",
 211                 SVCFH_fmt(&argp->fh),
 212                 argp->count, argp->offset);
 213
 214         argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
 215         argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
 216
 217         resp->pages = rqstp->rq_next_page;
 218
 219         /* Obtain buffer pointer for payload. 19 is 1 word for
 220          * status, 17 words for fattr, and 1 word for the byte count.
 221          */
 222         svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 223
 224         resp->count = argp->count;
 225         fh_copy(&resp->fh, &argp->fh);
 226         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 227                                  &resp->count, &eof);
 228         if (resp->status == nfs_ok)
 229                 resp->status = fh_getattr(&resp->fh, &resp->stat);
 230         else if (resp->status == nfserr_jukebox)
 231                 set_bit(RQ_DROPME, &rqstp->rq_flags);
 232         resp->status = nfsd_map_status(resp->status);
 233         return rpc_success;
 234 }
 235
 236 /* Reserved */
 237 static __be32
 238 nfsd_proc_writecache(struct svc_rqst *rqstp)
 239 {
 240         return rpc_success;
 241 }
 242
 243 /*
 244  * Write data to a file
 245  * N.B. After this call resp->fh needs an fh_put
 246  */
 247 static __be32
 248 nfsd_proc_write(struct svc_rqst *rqstp)
 249 {
 250         struct nfsd_writeargs *argp = rqstp->rq_argp;
 251         struct nfsd_attrstat *resp = rqstp->rq_resp;
 252         unsigned long cnt = argp->len;
 253         unsigned int nvecs;
 254
 255         dprintk("nfsd: WRITE    %s %u bytes at %d\n",
 256                 SVCFH_fmt(&argp->fh),
 257                 argp->len, argp->offset);
 258
 259         nvecs = svc_fill_write_vector(rqstp, &argp->payload);
 260
 261         resp->status = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh),
 262                                   argp->offset, rqstp->rq_vec, nvecs,
 263                                   &cnt, NFS_DATA_SYNC, NULL);
 264         if (resp->status == nfs_ok)
 265                 resp->status = fh_getattr(&resp->fh, &resp->stat);
 266         else if (resp->status == nfserr_jukebox)
 267                 set_bit(RQ_DROPME, &rqstp->rq_flags);
 268         resp->status = nfsd_map_status(resp->status);
 269         return rpc_success;
 270 }
 271
 272 /*
 273  * CREATE processing is complicated. The keyword here is `overloaded.'
 274  * The parent directory is kept locked between the check for existence
 275  * and the actual create() call in compliance with VFS protocols.
 276  * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
 277  */
 278 static __be32
 279 nfsd_proc_create(struct svc_rqst *rqstp)
 280 {
 281         struct nfsd_createargs *argp = rqstp->rq_argp;
 282         struct nfsd_diropres *resp = rqstp->rq_resp;
 283         svc_fh          *dirfhp = &argp->fh;
 284         svc_fh          *newfhp = &resp->fh;
 285         struct iattr    *attr = &argp->attrs;
 286         struct nfsd_attrs attrs = {
 287                 .na_iattr       = attr,
 288         };
 289         struct inode    *inode;
 290         struct dentry   *dchild;
 291         int             type, mode;
 292         int             hosterr;
 293         dev_t           rdev = 0, wanted = new_decode_dev(attr->ia_size);
 294
 295         dprintk("nfsd: CREATE   %s %.*s\n",
 296                 SVCFH_fmt(dirfhp), argp->len, argp->name);
 297
 298         /* First verify the parent file handle */
 299         resp->status = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
 300         if (resp->status != nfs_ok)
 301                 goto done; /* must fh_put dirfhp even on error */
 302
 303         /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
 304
 305         resp->status = nfserr_exist;
 306         if (isdotent(argp->name, argp->len))
 307                 goto done;
 308         hosterr = fh_want_write(dirfhp);
 309         if (hosterr) {
 310                 resp->status = nfserrno(hosterr);
 311                 goto done;
 312         }
 313
 314         inode_lock_nested(dirfhp->fh_dentry->d_inode, I_MUTEX_PARENT);
 315         dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
 316         if (IS_ERR(dchild)) {
 317                 resp->status = nfserrno(PTR_ERR(dchild));
 318                 goto out_unlock;
 319         }
 320         fh_init(newfhp, NFS_FHSIZE);
 321         resp->status = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
 322         if (!resp->status && d_really_is_negative(dchild))
 323                 resp->status = nfserr_noent;
 324         dput(dchild);
 325         if (resp->status) {
 326                 if (resp->status != nfserr_noent)
 327                         goto out_unlock;
 328                 /*
 329                  * If the new file handle wasn't verified, we can't tell
 330                  * whether the file exists or not. Time to bail ...
 331                  */
 332                 resp->status = nfserr_acces;
 333                 if (!newfhp->fh_dentry) {
 334                         printk(KERN_WARNING
 335                                 "nfsd_proc_create: file handle not verified\n");
 336                         goto out_unlock;
 337                 }
 338         }
 339
 340         inode = d_inode(newfhp->fh_dentry);
 341
 342         /* Unfudge the mode bits */
 343         if (attr->ia_valid & ATTR_MODE) {
 344                 type = attr->ia_mode & S_IFMT;
 345                 mode = attr->ia_mode & ~S_IFMT;
 346                 if (!type) {
 347                         /* no type, so if target exists, assume same as that,
 348                          * else assume a file */
 349                         if (inode) {
 350                                 type = inode->i_mode & S_IFMT;
 351                                 switch(type) {
 352                                 case S_IFCHR:
 353                                 case S_IFBLK:
 354                                         /* reserve rdev for later checking */
 355                                         rdev = inode->i_rdev;
 356                                         attr->ia_valid |= ATTR_SIZE;
 357
 358                                         fallthrough;
 359                                 case S_IFIFO:
 360                                         /* this is probably a permission check..
 361                                          * at least IRIX implements perm checking on
 362                                          *   echo thing > device-special-file-or-pipe
 363                                          * by doing a CREATE with type==0
 364                                          */
 365                                         resp->status = nfsd_permission(
 366                                                 &rqstp->rq_cred,
 367                                                 newfhp->fh_export,
 368                                                 newfhp->fh_dentry,
 369                                                 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
 370                                         if (resp->status && resp->status != nfserr_rofs)
 371                                                 goto out_unlock;
 372                                 }
 373                         } else
 374                                 type = S_IFREG;
 375                 }
 376         } else if (inode) {
 377                 type = inode->i_mode & S_IFMT;
 378                 mode = inode->i_mode & ~S_IFMT;
 379         } else {
 380                 type = S_IFREG;
 381                 mode = 0;       /* ??? */
 382         }
 383
 384         attr->ia_valid |= ATTR_MODE;
 385         attr->ia_mode = mode;
 386
 387         /* Special treatment for non-regular files according to the
 388          * gospel of sun micro
 389          */
 390         if (type != S_IFREG) {
 391                 if (type != S_IFBLK && type != S_IFCHR) {
 392                         rdev = 0;
 393                 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
 394                         /* If you think you've seen the worst, grok this. */
 395                         type = S_IFIFO;
 396                 } else {
 397                         /* Okay, char or block special */
 398                         if (!rdev)
 399                                 rdev = wanted;
 400                 }
 401
 402                 /* we've used the SIZE information, so discard it */
 403                 attr->ia_valid &= ~ATTR_SIZE;
 404
 405                 /* Make sure the type and device matches */
 406                 resp->status = nfserr_exist;
 407                 if (inode && inode_wrong_type(inode, type))
 408                         goto out_unlock;
 409         }
 410
 411         resp->status = nfs_ok;
 412         if (!inode) {
 413                 /* File doesn't exist. Create it and set attrs */
 414                 resp->status = nfsd_create_locked(rqstp, dirfhp, &attrs, type,
 415                                                   rdev, newfhp);
 416         } else if (type == S_IFREG) {
 417                 dprintk("nfsd:   existing %s, valid=%x, size=%ld\n",
 418                         argp->name, attr->ia_valid, (long) attr->ia_size);
 419                 /* File already exists. We ignore all attributes except
 420                  * size, so that creat() behaves exactly like
 421                  * open(..., O_CREAT|O_TRUNC|O_WRONLY).
 422                  */
 423                 attr->ia_valid &= ATTR_SIZE;
 424                 if (attr->ia_valid)
 425                         resp->status = nfsd_setattr(rqstp, newfhp, &attrs,
 426                                                     NULL);
 427         }
 428
 429 out_unlock:
 430         inode_unlock(dirfhp->fh_dentry->d_inode);
 431         fh_drop_write(dirfhp);
 432 done:
 433         fh_put(dirfhp);
 434         if (resp->status != nfs_ok)
 435                 goto out;
 436         resp->status = fh_getattr(&resp->fh, &resp->stat);
 437 out:
 438         resp->status = nfsd_map_status(resp->status);
 439         return rpc_success;
 440 }
 441
 442 static __be32
 443 nfsd_proc_remove(struct svc_rqst *rqstp)
 444 {
 445         struct nfsd_diropargs *argp = rqstp->rq_argp;
 446         struct nfsd_stat *resp = rqstp->rq_resp;
 447
 448         dprintk("nfsd: REMOVE   %s %.*s\n", SVCFH_fmt(&argp->fh),
 449                 argp->len, argp->name);
 450
 451         /* Unlink. -SIFDIR means file must not be a directory */
 452         resp->status = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR,
 453                                    argp->name, argp->len);
 454         fh_put(&argp->fh);
 455         resp->status = nfsd_map_status(resp->status);
 456         return rpc_success;
 457 }
 458
 459 static __be32
 460 nfsd_proc_rename(struct svc_rqst *rqstp)
 461 {
 462         struct nfsd_renameargs *argp = rqstp->rq_argp;
 463         struct nfsd_stat *resp = rqstp->rq_resp;
 464
 465         dprintk("nfsd: RENAME   %s %.*s -> \n",
 466                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
 467         dprintk("nfsd:        ->  %s %.*s\n",
 468                 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
 469
 470         resp->status = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
 471                                    &argp->tfh, argp->tname, argp->tlen);
 472         fh_put(&argp->ffh);
 473         fh_put(&argp->tfh);
 474         resp->status = nfsd_map_status(resp->status);
 475         return rpc_success;
 476 }
 477
 478 static __be32
 479 nfsd_proc_link(struct svc_rqst *rqstp)
 480 {
 481         struct nfsd_linkargs *argp = rqstp->rq_argp;
 482         struct nfsd_stat *resp = rqstp->rq_resp;
 483
 484         dprintk("nfsd: LINK     %s ->\n",
 485                 SVCFH_fmt(&argp->ffh));
 486         dprintk("nfsd:    %s %.*s\n",
 487                 SVCFH_fmt(&argp->tfh),
 488                 argp->tlen,
 489                 argp->tname);
 490
 491         resp->status = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
 492                                  &argp->ffh);
 493         fh_put(&argp->ffh);
 494         fh_put(&argp->tfh);
 495         resp->status = nfsd_map_status(resp->status);
 496         return rpc_success;
 497 }
 498
 499 static __be32
 500 nfsd_proc_symlink(struct svc_rqst *rqstp)
 501 {
 502         struct nfsd_symlinkargs *argp = rqstp->rq_argp;
 503         struct nfsd_stat *resp = rqstp->rq_resp;
 504         struct nfsd_attrs attrs = {
 505                 .na_iattr       = &argp->attrs,
 506         };
 507         struct svc_fh   newfh;
 508
 509         if (argp->tlen > NFS_MAXPATHLEN) {
 510                 resp->status = nfserr_nametoolong;
 511                 goto out;
 512         }
 513
 514         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 515                                                 page_address(rqstp->rq_arg.pages[0]),
 516                                                 argp->tlen);
 517         if (IS_ERR(argp->tname)) {
 518                 resp->status = nfserrno(PTR_ERR(argp->tname));
 519                 goto out;
 520         }
 521
 522         dprintk("nfsd: SYMLINK  %s %.*s -> %.*s\n",
 523                 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
 524                 argp->tlen, argp->tname);
 525
 526         fh_init(&newfh, NFS_FHSIZE);
 527         resp->status = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
 528                                     argp->tname, &attrs, &newfh);
 529
 530         kfree(argp->tname);
 531         fh_put(&argp->ffh);
 532         fh_put(&newfh);
 533 out:
 534         resp->status = nfsd_map_status(resp->status);
 535         return rpc_success;
 536 }
 537
 538 /*
 539  * Make directory. This operation is not idempotent.
 540  * N.B. After this call resp->fh needs an fh_put
 541  */
 542 static __be32
 543 nfsd_proc_mkdir(struct svc_rqst *rqstp)
 544 {
 545         struct nfsd_createargs *argp = rqstp->rq_argp;
 546         struct nfsd_diropres *resp = rqstp->rq_resp;
 547         struct nfsd_attrs attrs = {
 548                 .na_iattr       = &argp->attrs,
 549         };
 550
 551         dprintk("nfsd: MKDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 552
 553         if (resp->fh.fh_dentry) {
 554                 printk(KERN_WARNING
 555                         "nfsd_proc_mkdir: response already verified??\n");
 556         }
 557
 558         argp->attrs.ia_valid &= ~ATTR_SIZE;
 559         fh_init(&resp->fh, NFS_FHSIZE);
 560         resp->status = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
 561                                    &attrs, S_IFDIR, 0, &resp->fh);
 562         fh_put(&argp->fh);
 563         if (resp->status != nfs_ok)
 564                 goto out;
 565
 566         resp->status = fh_getattr(&resp->fh, &resp->stat);
 567 out:
 568         resp->status = nfsd_map_status(resp->status);
 569         return rpc_success;
 570 }
 571
 572 /*
 573  * Remove a directory
 574  */
 575 static __be32
 576 nfsd_proc_rmdir(struct svc_rqst *rqstp)
 577 {
 578         struct nfsd_diropargs *argp = rqstp->rq_argp;
 579         struct nfsd_stat *resp = rqstp->rq_resp;
 580
 581         dprintk("nfsd: RMDIR    %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
 582
 583         resp->status = nfsd_unlink(rqstp, &argp->fh, S_IFDIR,
 584                                    argp->name, argp->len);
 585         fh_put(&argp->fh);
 586         resp->status = nfsd_map_status(resp->status);
 587         return rpc_success;
 588 }
 589
 590 static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
 591                                     struct nfsd_readdirres *resp,
 592                                     u32 count)
 593 {
 594         struct xdr_buf *buf = &resp->dirlist;
 595         struct xdr_stream *xdr = &resp->xdr;
 596
 597         memset(buf, 0, sizeof(*buf));
 598
 599         /* Reserve room for the NULL ptr & eof flag (-2 words) */
 600         buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), (u32)PAGE_SIZE);
 601         buf->buflen -= XDR_UNIT * 2;
 602         buf->pages = rqstp->rq_next_page;
 603         rqstp->rq_next_page++;
 604
 605         xdr_init_encode_pages(xdr, buf, buf->pages,  NULL);
 606 }
 607
 608 /*
 609  * Read a portion of a directory.
 610  */
 611 static __be32
 612 nfsd_proc_readdir(struct svc_rqst *rqstp)
 613 {
 614         struct nfsd_readdirargs *argp = rqstp->rq_argp;
 615         struct nfsd_readdirres *resp = rqstp->rq_resp;
 616         loff_t          offset;
 617
 618         dprintk("nfsd: READDIR  %s %d bytes at %d\n",
 619                 SVCFH_fmt(&argp->fh),
 620                 argp->count, argp->cookie);
 621
 622         nfsd_init_dirlist_pages(rqstp, resp, argp->count);
 623
 624         resp->common.err = nfs_ok;
 625         resp->cookie_offset = 0;
 626         offset = argp->cookie;
 627         resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
 628                                     &resp->common, nfssvc_encode_entry);
 629         nfssvc_encode_nfscookie(resp, offset);
 630
 631         fh_put(&argp->fh);
 632         resp->status = nfsd_map_status(resp->status);
 633         return rpc_success;
 634 }
 635
 636 /*
 637  * Get file system info
 638  */
 639 static __be32
 640 nfsd_proc_statfs(struct svc_rqst *rqstp)
 641 {
 642         struct nfsd_fhandle *argp = rqstp->rq_argp;
 643         struct nfsd_statfsres *resp = rqstp->rq_resp;
 644
 645         dprintk("nfsd: STATFS   %s\n", SVCFH_fmt(&argp->fh));
 646
 647         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
 648                                    NFSD_MAY_BYPASS_GSS_ON_ROOT);
 649         fh_put(&argp->fh);
 650         resp->status = nfsd_map_status(resp->status);
 651         return rpc_success;
 652 }
 653
 654 /*
 655  * NFSv2 Server procedures.
 656  * Only the results of non-idempotent operations are cached.
 657  */
 658
 659 #define ST 1            /* status */
 660 #define FH 8            /* filehandle */
 661 #define AT 18           /* attributes */
 662
 663 static const struct svc_procedure nfsd_procedures2[18] = {
 664         [NFSPROC_NULL] = {
 665                 .pc_func = nfsd_proc_null,
 666                 .pc_decode = nfssvc_decode_voidarg,
 667                 .pc_encode = nfssvc_encode_voidres,
 668                 .pc_argsize = sizeof(struct nfsd_voidargs),
 669                 .pc_argzero = sizeof(struct nfsd_voidargs),
 670                 .pc_ressize = sizeof(struct nfsd_voidres),
 671                 .pc_cachetype = RC_NOCACHE,
 672                 .pc_xdrressize = 0,
 673                 .pc_name = "NULL",
 674         },
 675         [NFSPROC_GETATTR] = {
 676                 .pc_func = nfsd_proc_getattr,
 677                 .pc_decode = nfssvc_decode_fhandleargs,
 678                 .pc_encode = nfssvc_encode_attrstatres,
 679                 .pc_release = nfssvc_release_attrstat,
 680                 .pc_argsize = sizeof(struct nfsd_fhandle),
 681                 .pc_argzero = sizeof(struct nfsd_fhandle),
 682                 .pc_ressize = sizeof(struct nfsd_attrstat),
 683                 .pc_cachetype = RC_NOCACHE,
 684                 .pc_xdrressize = ST+AT,
 685                 .pc_name = "GETATTR",
 686         },
 687         [NFSPROC_SETATTR] = {
 688                 .pc_func = nfsd_proc_setattr,
 689                 .pc_decode = nfssvc_decode_sattrargs,
 690                 .pc_encode = nfssvc_encode_attrstatres,
 691                 .pc_release = nfssvc_release_attrstat,
 692                 .pc_argsize = sizeof(struct nfsd_sattrargs),
 693                 .pc_argzero = sizeof(struct nfsd_sattrargs),
 694                 .pc_ressize = sizeof(struct nfsd_attrstat),
 695                 .pc_cachetype = RC_REPLBUFF,
 696                 .pc_xdrressize = ST+AT,
 697                 .pc_name = "SETATTR",
 698         },
 699         [NFSPROC_ROOT] = {
 700                 .pc_func = nfsd_proc_root,
 701                 .pc_decode = nfssvc_decode_voidarg,
 702                 .pc_encode = nfssvc_encode_voidres,
 703                 .pc_argsize = sizeof(struct nfsd_voidargs),
 704                 .pc_argzero = sizeof(struct nfsd_voidargs),
 705                 .pc_ressize = sizeof(struct nfsd_voidres),
 706                 .pc_cachetype = RC_NOCACHE,
 707                 .pc_xdrressize = 0,
 708                 .pc_name = "ROOT",
 709         },
 710         [NFSPROC_LOOKUP] = {
 711                 .pc_func = nfsd_proc_lookup,
 712                 .pc_decode = nfssvc_decode_diropargs,
 713                 .pc_encode = nfssvc_encode_diropres,
 714                 .pc_release = nfssvc_release_diropres,
 715                 .pc_argsize = sizeof(struct nfsd_diropargs),
 716                 .pc_argzero = sizeof(struct nfsd_diropargs),
 717                 .pc_ressize = sizeof(struct nfsd_diropres),
 718                 .pc_cachetype = RC_NOCACHE,
 719                 .pc_xdrressize = ST+FH+AT,
 720                 .pc_name = "LOOKUP",
 721         },
 722         [NFSPROC_READLINK] = {
 723                 .pc_func = nfsd_proc_readlink,
 724                 .pc_decode = nfssvc_decode_fhandleargs,
 725                 .pc_encode = nfssvc_encode_readlinkres,
 726                 .pc_argsize = sizeof(struct nfsd_fhandle),
 727                 .pc_argzero = sizeof(struct nfsd_fhandle),
 728                 .pc_ressize = sizeof(struct nfsd_readlinkres),
 729                 .pc_cachetype = RC_NOCACHE,
 730                 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
 731                 .pc_name = "READLINK",
 732         },
 733         [NFSPROC_READ] = {
 734                 .pc_func = nfsd_proc_read,
 735                 .pc_decode = nfssvc_decode_readargs,
 736                 .pc_encode = nfssvc_encode_readres,
 737                 .pc_release = nfssvc_release_readres,
 738                 .pc_argsize = sizeof(struct nfsd_readargs),
 739                 .pc_argzero = sizeof(struct nfsd_readargs),
 740                 .pc_ressize = sizeof(struct nfsd_readres),
 741                 .pc_cachetype = RC_NOCACHE,
 742                 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
 743                 .pc_name = "READ",
 744         },
 745         [NFSPROC_WRITECACHE] = {
 746                 .pc_func = nfsd_proc_writecache,
 747                 .pc_decode = nfssvc_decode_voidarg,
 748                 .pc_encode = nfssvc_encode_voidres,
 749                 .pc_argsize = sizeof(struct nfsd_voidargs),
 750                 .pc_argzero = sizeof(struct nfsd_voidargs),
 751                 .pc_ressize = sizeof(struct nfsd_voidres),
 752                 .pc_cachetype = RC_NOCACHE,
 753                 .pc_xdrressize = 0,
 754                 .pc_name = "WRITECACHE",
 755         },
 756         [NFSPROC_WRITE] = {
 757                 .pc_func = nfsd_proc_write,
 758                 .pc_decode = nfssvc_decode_writeargs,
 759                 .pc_encode = nfssvc_encode_attrstatres,
 760                 .pc_release = nfssvc_release_attrstat,
 761                 .pc_argsize = sizeof(struct nfsd_writeargs),
 762                 .pc_argzero = sizeof(struct nfsd_writeargs),
 763                 .pc_ressize = sizeof(struct nfsd_attrstat),
 764                 .pc_cachetype = RC_REPLBUFF,
 765                 .pc_xdrressize = ST+AT,
 766                 .pc_name = "WRITE",
 767         },
 768         [NFSPROC_CREATE] = {
 769                 .pc_func = nfsd_proc_create,
 770                 .pc_decode = nfssvc_decode_createargs,
 771                 .pc_encode = nfssvc_encode_diropres,
 772                 .pc_release = nfssvc_release_diropres,
 773                 .pc_argsize = sizeof(struct nfsd_createargs),
 774                 .pc_argzero = sizeof(struct nfsd_createargs),
 775                 .pc_ressize = sizeof(struct nfsd_diropres),
 776                 .pc_cachetype = RC_REPLBUFF,
 777                 .pc_xdrressize = ST+FH+AT,
 778                 .pc_name = "CREATE",
 779         },
 780         [NFSPROC_REMOVE] = {
 781                 .pc_func = nfsd_proc_remove,
 782                 .pc_decode = nfssvc_decode_diropargs,
 783                 .pc_encode = nfssvc_encode_statres,
 784                 .pc_argsize = sizeof(struct nfsd_diropargs),
 785                 .pc_argzero = sizeof(struct nfsd_diropargs),
 786                 .pc_ressize = sizeof(struct nfsd_stat),
 787                 .pc_cachetype = RC_REPLSTAT,
 788                 .pc_xdrressize = ST,
 789                 .pc_name = "REMOVE",
 790         },
 791         [NFSPROC_RENAME] = {
 792                 .pc_func = nfsd_proc_rename,
 793                 .pc_decode = nfssvc_decode_renameargs,
 794                 .pc_encode = nfssvc_encode_statres,
 795                 .pc_argsize = sizeof(struct nfsd_renameargs),
 796                 .pc_argzero = sizeof(struct nfsd_renameargs),
 797                 .pc_ressize = sizeof(struct nfsd_stat),
 798                 .pc_cachetype = RC_REPLSTAT,
 799                 .pc_xdrressize = ST,
 800                 .pc_name = "RENAME",
 801         },
 802         [NFSPROC_LINK] = {
 803                 .pc_func = nfsd_proc_link,
 804                 .pc_decode = nfssvc_decode_linkargs,
 805                 .pc_encode = nfssvc_encode_statres,
 806                 .pc_argsize = sizeof(struct nfsd_linkargs),
 807                 .pc_argzero = sizeof(struct nfsd_linkargs),
 808                 .pc_ressize = sizeof(struct nfsd_stat),
 809                 .pc_cachetype = RC_REPLSTAT,
 810                 .pc_xdrressize = ST,
 811                 .pc_name = "LINK",
 812         },
 813         [NFSPROC_SYMLINK] = {
 814                 .pc_func = nfsd_proc_symlink,
 815                 .pc_decode = nfssvc_decode_symlinkargs,
 816                 .pc_encode = nfssvc_encode_statres,
 817                 .pc_argsize = sizeof(struct nfsd_symlinkargs),
 818                 .pc_argzero = sizeof(struct nfsd_symlinkargs),
 819                 .pc_ressize = sizeof(struct nfsd_stat),
 820                 .pc_cachetype = RC_REPLSTAT,
 821                 .pc_xdrressize = ST,
 822                 .pc_name = "SYMLINK",
 823         },
 824         [NFSPROC_MKDIR] = {
 825                 .pc_func = nfsd_proc_mkdir,
 826                 .pc_decode = nfssvc_decode_createargs,
 827                 .pc_encode = nfssvc_encode_diropres,
 828                 .pc_release = nfssvc_release_diropres,
 829                 .pc_argsize = sizeof(struct nfsd_createargs),
 830                 .pc_argzero = sizeof(struct nfsd_createargs),
 831                 .pc_ressize = sizeof(struct nfsd_diropres),
 832                 .pc_cachetype = RC_REPLBUFF,
 833                 .pc_xdrressize = ST+FH+AT,
 834                 .pc_name = "MKDIR",
 835         },
 836         [NFSPROC_RMDIR] = {
 837                 .pc_func = nfsd_proc_rmdir,
 838                 .pc_decode = nfssvc_decode_diropargs,
 839                 .pc_encode = nfssvc_encode_statres,
 840                 .pc_argsize = sizeof(struct nfsd_diropargs),
 841                 .pc_argzero = sizeof(struct nfsd_diropargs),
 842                 .pc_ressize = sizeof(struct nfsd_stat),
 843                 .pc_cachetype = RC_REPLSTAT,
 844                 .pc_xdrressize = ST,
 845                 .pc_name = "RMDIR",
 846         },
 847         [NFSPROC_READDIR] = {
 848                 .pc_func = nfsd_proc_readdir,
 849                 .pc_decode = nfssvc_decode_readdirargs,
 850                 .pc_encode = nfssvc_encode_readdirres,
 851                 .pc_argsize = sizeof(struct nfsd_readdirargs),
 852                 .pc_argzero = sizeof(struct nfsd_readdirargs),
 853                 .pc_ressize = sizeof(struct nfsd_readdirres),
 854                 .pc_cachetype = RC_NOCACHE,
 855                 .pc_name = "READDIR",
 856         },
 857         [NFSPROC_STATFS] = {
 858                 .pc_func = nfsd_proc_statfs,
 859                 .pc_decode = nfssvc_decode_fhandleargs,
 860                 .pc_encode = nfssvc_encode_statfsres,
 861                 .pc_argsize = sizeof(struct nfsd_fhandle),
 862                 .pc_argzero = sizeof(struct nfsd_fhandle),
 863                 .pc_ressize = sizeof(struct nfsd_statfsres),
 864                 .pc_cachetype = RC_NOCACHE,
 865                 .pc_xdrressize = ST+5,
 866                 .pc_name = "STATFS",
 867         },
 868 };
 869
 870 static DEFINE_PER_CPU_ALIGNED(unsigned long,
 871                               nfsd_count2[ARRAY_SIZE(nfsd_procedures2)]);
 872 const struct svc_version nfsd_version2 = {
 873         .vs_vers        = 2,
 874         .vs_nproc       = ARRAY_SIZE(nfsd_procedures2),
 875         .vs_proc        = nfsd_procedures2,
 876         .vs_count       = nfsd_count2,
 877         .vs_dispatch    = nfsd_dispatch,
 878         .vs_xdrsize     = NFS2_SVC_XDRSIZE,
 879 };