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