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