fs/nfsd/nfs3proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Process version 3 NFS requests.
   4  *
   5  * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/ext2_fs.h>
  10 #include <linux/magic.h>
  11
  12 #include "cache.h"
  13 #include "xdr3.h"
  14 #include "vfs.h"
  15
  16 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  17
  18 static int      nfs3_ftypes[] = {
  19         0,                      /* NF3NON */
  20         S_IFREG,                /* NF3REG */
  21         S_IFDIR,                /* NF3DIR */
  22         S_IFBLK,                /* NF3BLK */
  23         S_IFCHR,                /* NF3CHR */
  24         S_IFLNK,                /* NF3LNK */
  25         S_IFSOCK,               /* NF3SOCK */
  26         S_IFIFO,                /* NF3FIFO */
  27 };
  28
  29 /*
  30  * NULL call.
  31  */
  32 static __be32
  33 nfsd3_proc_null(struct svc_rqst *rqstp)
  34 {
  35         return rpc_success;
  36 }
  37
  38 /*
  39  * Get a file's attributes
  40  */
  41 static __be32
  42 nfsd3_proc_getattr(struct svc_rqst *rqstp)
  43 {
  44         struct nfsd_fhandle *argp = rqstp->rq_argp;
  45         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  46
  47         dprintk("nfsd: GETATTR(3)  %s\n",
  48                 SVCFH_fmt(&argp->fh));
  49
  50         fh_copy(&resp->fh, &argp->fh);
  51         resp->status = fh_verify(rqstp, &resp->fh, 0,
  52                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  53         if (resp->status != nfs_ok)
  54                 goto out;
  55
  56         resp->status = fh_getattr(&resp->fh, &resp->stat);
  57 out:
  58         return rpc_success;
  59 }
  60
  61 /*
  62  * Set a file's attributes
  63  */
  64 static __be32
  65 nfsd3_proc_setattr(struct svc_rqst *rqstp)
  66 {
  67         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  68         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  69
  70         dprintk("nfsd: SETATTR(3)  %s\n",
  71                                 SVCFH_fmt(&argp->fh));
  72
  73         fh_copy(&resp->fh, &argp->fh);
  74         resp->status = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  75                                     argp->check_guard, argp->guardtime);
  76         return rpc_success;
  77 }
  78
  79 /*
  80  * Look up a path name component
  81  */
  82 static __be32
  83 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  84 {
  85         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  86         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  87
  88         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  89                                 SVCFH_fmt(&argp->fh),
  90                                 argp->len,
  91                                 argp->name);
  92
  93         fh_copy(&resp->dirfh, &argp->fh);
  94         fh_init(&resp->fh, NFS3_FHSIZE);
  95
  96         resp->status = nfsd_lookup(rqstp, &resp->dirfh,
  97                                    argp->name, argp->len,
  98                                    &resp->fh);
  99         return rpc_success;
 100 }
 101
 102 /*
 103  * Check file access
 104  */
 105 static __be32
 106 nfsd3_proc_access(struct svc_rqst *rqstp)
 107 {
 108         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 109         struct nfsd3_accessres *resp = rqstp->rq_resp;
 110
 111         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 112                                 SVCFH_fmt(&argp->fh),
 113                                 argp->access);
 114
 115         fh_copy(&resp->fh, &argp->fh);
 116         resp->access = argp->access;
 117         resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 118         return rpc_success;
 119 }
 120
 121 /*
 122  * Read a symlink.
 123  */
 124 static __be32
 125 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 126 {
 127         struct nfsd_fhandle *argp = rqstp->rq_argp;
 128         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 129
 130         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 131
 132         /* Read the symlink. */
 133         fh_copy(&resp->fh, &argp->fh);
 134         resp->len = NFS3_MAXPATHLEN;
 135         resp->pages = rqstp->rq_next_page++;
 136         resp->status = nfsd_readlink(rqstp, &resp->fh,
 137                                      page_address(*resp->pages), &resp->len);
 138         return rpc_success;
 139 }
 140
 141 /*
 142  * Read a portion of a file.
 143  */
 144 static __be32
 145 nfsd3_proc_read(struct svc_rqst *rqstp)
 146 {
 147         struct nfsd3_readargs *argp = rqstp->rq_argp;
 148         struct nfsd3_readres *resp = rqstp->rq_resp;
 149         u32 max_blocksize = svc_max_payload(rqstp);
 150         unsigned int len;
 151         int v;
 152
 153         argp->count = min_t(u32, argp->count, max_blocksize);
 154
 155         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 156                                 SVCFH_fmt(&argp->fh),
 157                                 (unsigned long) argp->count,
 158                                 (unsigned long long) argp->offset);
 159
 160         v = 0;
 161         len = argp->count;
 162         resp->pages = rqstp->rq_next_page;
 163         while (len > 0) {
 164                 struct page *page = *(rqstp->rq_next_page++);
 165
 166                 rqstp->rq_vec[v].iov_base = page_address(page);
 167                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 168                 len -= rqstp->rq_vec[v].iov_len;
 169                 v++;
 170         }
 171
 172         /* Obtain buffer pointer for payload.
 173          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 174          * + 1 (xdr opaque byte count) = 26
 175          */
 176         resp->count = argp->count;
 177         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 178
 179         fh_copy(&resp->fh, &argp->fh);
 180         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 181                                  rqstp->rq_vec, v, &resp->count, &resp->eof);
 182         return rpc_success;
 183 }
 184
 185 /*
 186  * Write data to a file
 187  */
 188 static __be32
 189 nfsd3_proc_write(struct svc_rqst *rqstp)
 190 {
 191         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 192         struct nfsd3_writeres *resp = rqstp->rq_resp;
 193         unsigned long cnt = argp->len;
 194         unsigned int nvecs;
 195
 196         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 197                                 SVCFH_fmt(&argp->fh),
 198                                 argp->len,
 199                                 (unsigned long long) argp->offset,
 200                                 argp->stable? " stable" : "");
 201
 202         fh_copy(&resp->fh, &argp->fh);
 203         resp->committed = argp->stable;
 204         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 205                                       &argp->first, cnt);
 206         if (!nvecs) {
 207                 resp->status = nfserr_io;
 208                 goto out;
 209         }
 210         resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
 211                                   rqstp->rq_vec, nvecs, &cnt,
 212                                   resp->committed, resp->verf);
 213         resp->count = cnt;
 214 out:
 215         return rpc_success;
 216 }
 217
 218 /*
 219  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 220  * At least in theory; we'll see how it fares in practice when the
 221  * first reports about SunOS compatibility problems start to pour in...
 222  */
 223 static __be32
 224 nfsd3_proc_create(struct svc_rqst *rqstp)
 225 {
 226         struct nfsd3_createargs *argp = rqstp->rq_argp;
 227         struct nfsd3_diropres *resp = rqstp->rq_resp;
 228         svc_fh          *dirfhp, *newfhp = NULL;
 229         struct iattr    *attr;
 230
 231         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 232                                 SVCFH_fmt(&argp->fh),
 233                                 argp->len,
 234                                 argp->name);
 235
 236         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 237         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 238         attr   = &argp->attrs;
 239
 240         /* Unfudge the mode bits */
 241         attr->ia_mode &= ~S_IFMT;
 242         if (!(attr->ia_valid & ATTR_MODE)) {
 243                 attr->ia_valid |= ATTR_MODE;
 244                 attr->ia_mode = S_IFREG;
 245         } else {
 246                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 247         }
 248
 249         /* Now create the file and set attributes */
 250         resp->status = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 251                                       attr, newfhp, argp->createmode,
 252                                       (u32 *)argp->verf, NULL, NULL);
 253         return rpc_success;
 254 }
 255
 256 /*
 257  * Make directory. This operation is not idempotent.
 258  */
 259 static __be32
 260 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 261 {
 262         struct nfsd3_createargs *argp = rqstp->rq_argp;
 263         struct nfsd3_diropres *resp = rqstp->rq_resp;
 264
 265         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 266                                 SVCFH_fmt(&argp->fh),
 267                                 argp->len,
 268                                 argp->name);
 269
 270         argp->attrs.ia_valid &= ~ATTR_SIZE;
 271         fh_copy(&resp->dirfh, &argp->fh);
 272         fh_init(&resp->fh, NFS3_FHSIZE);
 273         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 274                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 275         fh_unlock(&resp->dirfh);
 276         return rpc_success;
 277 }
 278
 279 static __be32
 280 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 281 {
 282         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 283         struct nfsd3_diropres *resp = rqstp->rq_resp;
 284
 285         if (argp->tlen == 0) {
 286                 resp->status = nfserr_inval;
 287                 goto out;
 288         }
 289         if (argp->tlen > NFS3_MAXPATHLEN) {
 290                 resp->status = nfserr_nametoolong;
 291                 goto out;
 292         }
 293
 294         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 295                                                 page_address(rqstp->rq_arg.pages[0]),
 296                                                 argp->tlen);
 297         if (IS_ERR(argp->tname)) {
 298                 resp->status = nfserrno(PTR_ERR(argp->tname));
 299                 goto out;
 300         }
 301
 302         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 303                                 SVCFH_fmt(&argp->ffh),
 304                                 argp->flen, argp->fname,
 305                                 argp->tlen, argp->tname);
 306
 307         fh_copy(&resp->dirfh, &argp->ffh);
 308         fh_init(&resp->fh, NFS3_FHSIZE);
 309         resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
 310                                     argp->flen, argp->tname, &resp->fh);
 311         kfree(argp->tname);
 312 out:
 313         return rpc_success;
 314 }
 315
 316 /*
 317  * Make socket/fifo/device.
 318  */
 319 static __be32
 320 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 321 {
 322         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 323         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 324         int type;
 325         dev_t   rdev = 0;
 326
 327         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 328                                 SVCFH_fmt(&argp->fh),
 329                                 argp->len,
 330                                 argp->name);
 331
 332         fh_copy(&resp->dirfh, &argp->fh);
 333         fh_init(&resp->fh, NFS3_FHSIZE);
 334
 335         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 336                 rdev = MKDEV(argp->major, argp->minor);
 337                 if (MAJOR(rdev) != argp->major ||
 338                     MINOR(rdev) != argp->minor) {
 339                         resp->status = nfserr_inval;
 340                         goto out;
 341                 }
 342         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 343                 resp->status = nfserr_badtype;
 344                 goto out;
 345         }
 346
 347         type = nfs3_ftypes[argp->ftype];
 348         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 349                                    &argp->attrs, type, rdev, &resp->fh);
 350         fh_unlock(&resp->dirfh);
 351 out:
 352         return rpc_success;
 353 }
 354
 355 /*
 356  * Remove file/fifo/socket etc.
 357  */
 358 static __be32
 359 nfsd3_proc_remove(struct svc_rqst *rqstp)
 360 {
 361         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 362         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 363
 364         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 365                                 SVCFH_fmt(&argp->fh),
 366                                 argp->len,
 367                                 argp->name);
 368
 369         /* Unlink. -S_IFDIR means file must not be a directory */
 370         fh_copy(&resp->fh, &argp->fh);
 371         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 372                                    argp->name, argp->len);
 373         fh_unlock(&resp->fh);
 374         return rpc_success;
 375 }
 376
 377 /*
 378  * Remove a directory
 379  */
 380 static __be32
 381 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 382 {
 383         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 384         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 385
 386         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 387                                 SVCFH_fmt(&argp->fh),
 388                                 argp->len,
 389                                 argp->name);
 390
 391         fh_copy(&resp->fh, &argp->fh);
 392         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 393                                    argp->name, argp->len);
 394         fh_unlock(&resp->fh);
 395         return rpc_success;
 396 }
 397
 398 static __be32
 399 nfsd3_proc_rename(struct svc_rqst *rqstp)
 400 {
 401         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 402         struct nfsd3_renameres *resp = rqstp->rq_resp;
 403
 404         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 405                                 SVCFH_fmt(&argp->ffh),
 406                                 argp->flen,
 407                                 argp->fname);
 408         dprintk("nfsd: -> %s %.*s\n",
 409                                 SVCFH_fmt(&argp->tfh),
 410                                 argp->tlen,
 411                                 argp->tname);
 412
 413         fh_copy(&resp->ffh, &argp->ffh);
 414         fh_copy(&resp->tfh, &argp->tfh);
 415         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 416                                    &resp->tfh, argp->tname, argp->tlen);
 417         return rpc_success;
 418 }
 419
 420 static __be32
 421 nfsd3_proc_link(struct svc_rqst *rqstp)
 422 {
 423         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 424         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 425
 426         dprintk("nfsd: LINK(3)     %s ->\n",
 427                                 SVCFH_fmt(&argp->ffh));
 428         dprintk("nfsd:   -> %s %.*s\n",
 429                                 SVCFH_fmt(&argp->tfh),
 430                                 argp->tlen,
 431                                 argp->tname);
 432
 433         fh_copy(&resp->fh,  &argp->ffh);
 434         fh_copy(&resp->tfh, &argp->tfh);
 435         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 436                                  &resp->fh);
 437         return rpc_success;
 438 }
 439
 440 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
 441                                      struct nfsd3_readdirres *resp,
 442                                      int count)
 443 {
 444         struct xdr_buf *buf = &resp->dirlist;
 445         struct xdr_stream *xdr = &resp->xdr;
 446
 447         count = min_t(u32, count, svc_max_payload(rqstp));
 448
 449         memset(buf, 0, sizeof(*buf));
 450
 451         /* Reserve room for the NULL ptr & eof flag (-2 words) */
 452         buf->buflen = count - XDR_UNIT * 2;
 453         buf->pages = rqstp->rq_next_page;
 454         while (count > 0) {
 455                 rqstp->rq_next_page++;
 456                 count -= PAGE_SIZE;
 457         }
 458
 459         /* This is xdr_init_encode(), but it assumes that
 460          * the head kvec has already been consumed. */
 461         xdr_set_scratch_buffer(xdr, NULL, 0);
 462         xdr->buf = buf;
 463         xdr->page_ptr = buf->pages;
 464         xdr->iov = NULL;
 465         xdr->p = page_address(*buf->pages);
 466         xdr->end = xdr->p + (PAGE_SIZE >> 2);
 467         xdr->rqst = NULL;
 468 }
 469
 470 /*
 471  * Read a portion of a directory.
 472  */
 473 static __be32
 474 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 475 {
 476         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 477         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 478         loff_t          offset;
 479
 480         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 481                                 SVCFH_fmt(&argp->fh),
 482                                 argp->count, (u32) argp->cookie);
 483
 484         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 485
 486         fh_copy(&resp->fh, &argp->fh);
 487         resp->common.err = nfs_ok;
 488         resp->cookie_offset = 0;
 489         resp->rqstp = rqstp;
 490         offset = argp->cookie;
 491         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 492                                     &resp->common, nfs3svc_encode_entry3);
 493         memcpy(resp->verf, argp->verf, 8);
 494         nfs3svc_encode_cookie3(resp, offset);
 495
 496         /* Recycle only pages that were part of the reply */
 497         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 498
 499         return rpc_success;
 500 }
 501
 502 /*
 503  * Read a portion of a directory, including file handles and attrs.
 504  * For now, we choose to ignore the dircount parameter.
 505  */
 506 static __be32
 507 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 508 {
 509         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 510         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 511         loff_t  offset;
 512
 513         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 514                                 SVCFH_fmt(&argp->fh),
 515                                 argp->count, (u32) argp->cookie);
 516
 517         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 518
 519         fh_copy(&resp->fh, &argp->fh);
 520         resp->common.err = nfs_ok;
 521         resp->cookie_offset = 0;
 522         resp->rqstp = rqstp;
 523         offset = argp->cookie;
 524
 525         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 526         if (resp->status != nfs_ok)
 527                 goto out;
 528
 529         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 530                 resp->status = nfserr_notsupp;
 531                 goto out;
 532         }
 533
 534         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 535                                     &resp->common, nfs3svc_encode_entryplus3);
 536         memcpy(resp->verf, argp->verf, 8);
 537         nfs3svc_encode_cookie3(resp, offset);
 538
 539         /* Recycle only pages that were part of the reply */
 540         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 541
 542 out:
 543         return rpc_success;
 544 }
 545
 546 /*
 547  * Get file system stats
 548  */
 549 static __be32
 550 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 551 {
 552         struct nfsd_fhandle *argp = rqstp->rq_argp;
 553         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 554
 555         dprintk("nfsd: FSSTAT(3)   %s\n",
 556                                 SVCFH_fmt(&argp->fh));
 557
 558         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 559         fh_put(&argp->fh);
 560         return rpc_success;
 561 }
 562
 563 /*
 564  * Get file system info
 565  */
 566 static __be32
 567 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 568 {
 569         struct nfsd_fhandle *argp = rqstp->rq_argp;
 570         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 571         u32     max_blocksize = svc_max_payload(rqstp);
 572
 573         dprintk("nfsd: FSINFO(3)   %s\n",
 574                                 SVCFH_fmt(&argp->fh));
 575
 576         resp->f_rtmax  = max_blocksize;
 577         resp->f_rtpref = max_blocksize;
 578         resp->f_rtmult = PAGE_SIZE;
 579         resp->f_wtmax  = max_blocksize;
 580         resp->f_wtpref = max_blocksize;
 581         resp->f_wtmult = PAGE_SIZE;
 582         resp->f_dtpref = max_blocksize;
 583         resp->f_maxfilesize = ~(u32) 0;
 584         resp->f_properties = NFS3_FSF_DEFAULT;
 585
 586         resp->status = fh_verify(rqstp, &argp->fh, 0,
 587                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 588
 589         /* Check special features of the file system. May request
 590          * different read/write sizes for file systems known to have
 591          * problems with large blocks */
 592         if (resp->status == nfs_ok) {
 593                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 594
 595                 /* Note that we don't care for remote fs's here */
 596                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 597                         resp->f_properties = NFS3_FSF_BILLYBOY;
 598                 }
 599                 resp->f_maxfilesize = sb->s_maxbytes;
 600         }
 601
 602         fh_put(&argp->fh);
 603         return rpc_success;
 604 }
 605
 606 /*
 607  * Get pathconf info for the specified file
 608  */
 609 static __be32
 610 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 611 {
 612         struct nfsd_fhandle *argp = rqstp->rq_argp;
 613         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 614
 615         dprintk("nfsd: PATHCONF(3) %s\n",
 616                                 SVCFH_fmt(&argp->fh));
 617
 618         /* Set default pathconf */
 619         resp->p_link_max = 255;         /* at least */
 620         resp->p_name_max = 255;         /* at least */
 621         resp->p_no_trunc = 0;
 622         resp->p_chown_restricted = 1;
 623         resp->p_case_insensitive = 0;
 624         resp->p_case_preserving = 1;
 625
 626         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 627
 628         if (resp->status == nfs_ok) {
 629                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 630
 631                 /* Note that we don't care for remote fs's here */
 632                 switch (sb->s_magic) {
 633                 case EXT2_SUPER_MAGIC:
 634                         resp->p_link_max = EXT2_LINK_MAX;
 635                         resp->p_name_max = EXT2_NAME_LEN;
 636                         break;
 637                 case MSDOS_SUPER_MAGIC:
 638                         resp->p_case_insensitive = 1;
 639                         resp->p_case_preserving  = 0;
 640                         break;
 641                 }
 642         }
 643
 644         fh_put(&argp->fh);
 645         return rpc_success;
 646 }
 647
 648 /*
 649  * Commit a file (range) to stable storage.
 650  */
 651 static __be32
 652 nfsd3_proc_commit(struct svc_rqst *rqstp)
 653 {
 654         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 655         struct nfsd3_commitres *resp = rqstp->rq_resp;
 656
 657         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 658                                 SVCFH_fmt(&argp->fh),
 659                                 argp->count,
 660                                 (unsigned long long) argp->offset);
 661
 662         if (argp->offset > NFS_OFFSET_MAX) {
 663                 resp->status = nfserr_inval;
 664                 goto out;
 665         }
 666
 667         fh_copy(&resp->fh, &argp->fh);
 668         resp->status = nfsd_commit(rqstp, &resp->fh, argp->offset,
 669                                    argp->count, resp->verf);
 670 out:
 671         return rpc_success;
 672 }
 673
 674
 675 /*
 676  * NFSv3 Server procedures.
 677  * Only the results of non-idempotent operations are cached.
 678  */
 679 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 680 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 681 #define nfsd3_mkdirargs                 nfsd3_createargs
 682 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 683 #define nfsd3_fhandleargs               nfsd_fhandle
 684 #define nfsd3_attrstatres               nfsd3_attrstat
 685 #define nfsd3_wccstatres                nfsd3_attrstat
 686 #define nfsd3_createres                 nfsd3_diropres
 687
 688 #define ST 1            /* status*/
 689 #define FH 17           /* filehandle with length */
 690 #define AT 21           /* attributes */
 691 #define pAT (1+AT)      /* post attributes - conditional */
 692 #define WC (7+pAT)      /* WCC attributes */
 693
 694 static const struct svc_procedure nfsd_procedures3[22] = {
 695         [NFS3PROC_NULL] = {
 696                 .pc_func = nfsd3_proc_null,
 697                 .pc_decode = nfssvc_decode_voidarg,
 698                 .pc_encode = nfssvc_encode_voidres,
 699                 .pc_argsize = sizeof(struct nfsd_voidargs),
 700                 .pc_ressize = sizeof(struct nfsd_voidres),
 701                 .pc_cachetype = RC_NOCACHE,
 702                 .pc_xdrressize = ST,
 703                 .pc_name = "NULL",
 704         },
 705         [NFS3PROC_GETATTR] = {
 706                 .pc_func = nfsd3_proc_getattr,
 707                 .pc_decode = nfs3svc_decode_fhandleargs,
 708                 .pc_encode = nfs3svc_encode_getattrres,
 709                 .pc_release = nfs3svc_release_fhandle,
 710                 .pc_argsize = sizeof(struct nfsd_fhandle),
 711                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 712                 .pc_cachetype = RC_NOCACHE,
 713                 .pc_xdrressize = ST+AT,
 714                 .pc_name = "GETATTR",
 715         },
 716         [NFS3PROC_SETATTR] = {
 717                 .pc_func = nfsd3_proc_setattr,
 718                 .pc_decode = nfs3svc_decode_sattrargs,
 719                 .pc_encode = nfs3svc_encode_wccstatres,
 720                 .pc_release = nfs3svc_release_fhandle,
 721                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 722                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 723                 .pc_cachetype = RC_REPLBUFF,
 724                 .pc_xdrressize = ST+WC,
 725                 .pc_name = "SETATTR",
 726         },
 727         [NFS3PROC_LOOKUP] = {
 728                 .pc_func = nfsd3_proc_lookup,
 729                 .pc_decode = nfs3svc_decode_diropargs,
 730                 .pc_encode = nfs3svc_encode_lookupres,
 731                 .pc_release = nfs3svc_release_fhandle2,
 732                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 733                 .pc_ressize = sizeof(struct nfsd3_diropres),
 734                 .pc_cachetype = RC_NOCACHE,
 735                 .pc_xdrressize = ST+FH+pAT+pAT,
 736                 .pc_name = "LOOKUP",
 737         },
 738         [NFS3PROC_ACCESS] = {
 739                 .pc_func = nfsd3_proc_access,
 740                 .pc_decode = nfs3svc_decode_accessargs,
 741                 .pc_encode = nfs3svc_encode_accessres,
 742                 .pc_release = nfs3svc_release_fhandle,
 743                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 744                 .pc_ressize = sizeof(struct nfsd3_accessres),
 745                 .pc_cachetype = RC_NOCACHE,
 746                 .pc_xdrressize = ST+pAT+1,
 747                 .pc_name = "ACCESS",
 748         },
 749         [NFS3PROC_READLINK] = {
 750                 .pc_func = nfsd3_proc_readlink,
 751                 .pc_decode = nfs3svc_decode_fhandleargs,
 752                 .pc_encode = nfs3svc_encode_readlinkres,
 753                 .pc_release = nfs3svc_release_fhandle,
 754                 .pc_argsize = sizeof(struct nfsd_fhandle),
 755                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 756                 .pc_cachetype = RC_NOCACHE,
 757                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 758                 .pc_name = "READLINK",
 759         },
 760         [NFS3PROC_READ] = {
 761                 .pc_func = nfsd3_proc_read,
 762                 .pc_decode = nfs3svc_decode_readargs,
 763                 .pc_encode = nfs3svc_encode_readres,
 764                 .pc_release = nfs3svc_release_fhandle,
 765                 .pc_argsize = sizeof(struct nfsd3_readargs),
 766                 .pc_ressize = sizeof(struct nfsd3_readres),
 767                 .pc_cachetype = RC_NOCACHE,
 768                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 769                 .pc_name = "READ",
 770         },
 771         [NFS3PROC_WRITE] = {
 772                 .pc_func = nfsd3_proc_write,
 773                 .pc_decode = nfs3svc_decode_writeargs,
 774                 .pc_encode = nfs3svc_encode_writeres,
 775                 .pc_release = nfs3svc_release_fhandle,
 776                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 777                 .pc_ressize = sizeof(struct nfsd3_writeres),
 778                 .pc_cachetype = RC_REPLBUFF,
 779                 .pc_xdrressize = ST+WC+4,
 780                 .pc_name = "WRITE",
 781         },
 782         [NFS3PROC_CREATE] = {
 783                 .pc_func = nfsd3_proc_create,
 784                 .pc_decode = nfs3svc_decode_createargs,
 785                 .pc_encode = nfs3svc_encode_createres,
 786                 .pc_release = nfs3svc_release_fhandle2,
 787                 .pc_argsize = sizeof(struct nfsd3_createargs),
 788                 .pc_ressize = sizeof(struct nfsd3_createres),
 789                 .pc_cachetype = RC_REPLBUFF,
 790                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 791                 .pc_name = "CREATE",
 792         },
 793         [NFS3PROC_MKDIR] = {
 794                 .pc_func = nfsd3_proc_mkdir,
 795                 .pc_decode = nfs3svc_decode_mkdirargs,
 796                 .pc_encode = nfs3svc_encode_createres,
 797                 .pc_release = nfs3svc_release_fhandle2,
 798                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 799                 .pc_ressize = sizeof(struct nfsd3_createres),
 800                 .pc_cachetype = RC_REPLBUFF,
 801                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 802                 .pc_name = "MKDIR",
 803         },
 804         [NFS3PROC_SYMLINK] = {
 805                 .pc_func = nfsd3_proc_symlink,
 806                 .pc_decode = nfs3svc_decode_symlinkargs,
 807                 .pc_encode = nfs3svc_encode_createres,
 808                 .pc_release = nfs3svc_release_fhandle2,
 809                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 810                 .pc_ressize = sizeof(struct nfsd3_createres),
 811                 .pc_cachetype = RC_REPLBUFF,
 812                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 813                 .pc_name = "SYMLINK",
 814         },
 815         [NFS3PROC_MKNOD] = {
 816                 .pc_func = nfsd3_proc_mknod,
 817                 .pc_decode = nfs3svc_decode_mknodargs,
 818                 .pc_encode = nfs3svc_encode_createres,
 819                 .pc_release = nfs3svc_release_fhandle2,
 820                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 821                 .pc_ressize = sizeof(struct nfsd3_createres),
 822                 .pc_cachetype = RC_REPLBUFF,
 823                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 824                 .pc_name = "MKNOD",
 825         },
 826         [NFS3PROC_REMOVE] = {
 827                 .pc_func = nfsd3_proc_remove,
 828                 .pc_decode = nfs3svc_decode_diropargs,
 829                 .pc_encode = nfs3svc_encode_wccstatres,
 830                 .pc_release = nfs3svc_release_fhandle,
 831                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 832                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 833                 .pc_cachetype = RC_REPLBUFF,
 834                 .pc_xdrressize = ST+WC,
 835                 .pc_name = "REMOVE",
 836         },
 837         [NFS3PROC_RMDIR] = {
 838                 .pc_func = nfsd3_proc_rmdir,
 839                 .pc_decode = nfs3svc_decode_diropargs,
 840                 .pc_encode = nfs3svc_encode_wccstatres,
 841                 .pc_release = nfs3svc_release_fhandle,
 842                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 843                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 844                 .pc_cachetype = RC_REPLBUFF,
 845                 .pc_xdrressize = ST+WC,
 846                 .pc_name = "RMDIR",
 847         },
 848         [NFS3PROC_RENAME] = {
 849                 .pc_func = nfsd3_proc_rename,
 850                 .pc_decode = nfs3svc_decode_renameargs,
 851                 .pc_encode = nfs3svc_encode_renameres,
 852                 .pc_release = nfs3svc_release_fhandle2,
 853                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 854                 .pc_ressize = sizeof(struct nfsd3_renameres),
 855                 .pc_cachetype = RC_REPLBUFF,
 856                 .pc_xdrressize = ST+WC+WC,
 857                 .pc_name = "RENAME",
 858         },
 859         [NFS3PROC_LINK] = {
 860                 .pc_func = nfsd3_proc_link,
 861                 .pc_decode = nfs3svc_decode_linkargs,
 862                 .pc_encode = nfs3svc_encode_linkres,
 863                 .pc_release = nfs3svc_release_fhandle2,
 864                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 865                 .pc_ressize = sizeof(struct nfsd3_linkres),
 866                 .pc_cachetype = RC_REPLBUFF,
 867                 .pc_xdrressize = ST+pAT+WC,
 868                 .pc_name = "LINK",
 869         },
 870         [NFS3PROC_READDIR] = {
 871                 .pc_func = nfsd3_proc_readdir,
 872                 .pc_decode = nfs3svc_decode_readdirargs,
 873                 .pc_encode = nfs3svc_encode_readdirres,
 874                 .pc_release = nfs3svc_release_fhandle,
 875                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 876                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 877                 .pc_cachetype = RC_NOCACHE,
 878                 .pc_name = "READDIR",
 879         },
 880         [NFS3PROC_READDIRPLUS] = {
 881                 .pc_func = nfsd3_proc_readdirplus,
 882                 .pc_decode = nfs3svc_decode_readdirplusargs,
 883                 .pc_encode = nfs3svc_encode_readdirres,
 884                 .pc_release = nfs3svc_release_fhandle,
 885                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 886                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 887                 .pc_cachetype = RC_NOCACHE,
 888                 .pc_name = "READDIRPLUS",
 889         },
 890         [NFS3PROC_FSSTAT] = {
 891                 .pc_func = nfsd3_proc_fsstat,
 892                 .pc_decode = nfs3svc_decode_fhandleargs,
 893                 .pc_encode = nfs3svc_encode_fsstatres,
 894                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 895                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 896                 .pc_cachetype = RC_NOCACHE,
 897                 .pc_xdrressize = ST+pAT+2*6+1,
 898                 .pc_name = "FSSTAT",
 899         },
 900         [NFS3PROC_FSINFO] = {
 901                 .pc_func = nfsd3_proc_fsinfo,
 902                 .pc_decode = nfs3svc_decode_fhandleargs,
 903                 .pc_encode = nfs3svc_encode_fsinfores,
 904                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 905                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 906                 .pc_cachetype = RC_NOCACHE,
 907                 .pc_xdrressize = ST+pAT+12,
 908                 .pc_name = "FSINFO",
 909         },
 910         [NFS3PROC_PATHCONF] = {
 911                 .pc_func = nfsd3_proc_pathconf,
 912                 .pc_decode = nfs3svc_decode_fhandleargs,
 913                 .pc_encode = nfs3svc_encode_pathconfres,
 914                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 915                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 916                 .pc_cachetype = RC_NOCACHE,
 917                 .pc_xdrressize = ST+pAT+6,
 918                 .pc_name = "PATHCONF",
 919         },
 920         [NFS3PROC_COMMIT] = {
 921                 .pc_func = nfsd3_proc_commit,
 922                 .pc_decode = nfs3svc_decode_commitargs,
 923                 .pc_encode = nfs3svc_encode_commitres,
 924                 .pc_release = nfs3svc_release_fhandle,
 925                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 926                 .pc_ressize = sizeof(struct nfsd3_commitres),
 927                 .pc_cachetype = RC_NOCACHE,
 928                 .pc_xdrressize = ST+WC+2,
 929                 .pc_name = "COMMIT",
 930         },
 931 };
 932
 933 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 934 const struct svc_version nfsd_version3 = {
 935         .vs_vers        = 3,
 936         .vs_nproc       = 22,
 937         .vs_proc        = nfsd_procedures3,
 938         .vs_dispatch    = nfsd_dispatch,
 939         .vs_count       = nfsd_count3,
 940         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 941 };