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