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