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         char *buffer = page_address(*(rqstp->rq_next_page++));
 130
 131         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 132
 133         /* Read the symlink. */
 134         fh_copy(&resp->fh, &argp->fh);
 135         resp->len = NFS3_MAXPATHLEN;
 136         resp->status = nfsd_readlink(rqstp, &resp->fh, buffer, &resp->len);
 137         return rpc_success;
 138 }
 139
 140 /*
 141  * Read a portion of a file.
 142  */
 143 static __be32
 144 nfsd3_proc_read(struct svc_rqst *rqstp)
 145 {
 146         struct nfsd3_readargs *argp = rqstp->rq_argp;
 147         struct nfsd3_readres *resp = rqstp->rq_resp;
 148         u32 max_blocksize = svc_max_payload(rqstp);
 149         unsigned int len;
 150         int v;
 151
 152         argp->count = min_t(u32, argp->count, max_blocksize);
 153
 154         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 155                                 SVCFH_fmt(&argp->fh),
 156                                 (unsigned long) argp->count,
 157                                 (unsigned long long) argp->offset);
 158
 159         v = 0;
 160         len = argp->count;
 161         while (len > 0) {
 162                 struct page *page = *(rqstp->rq_next_page++);
 163
 164                 rqstp->rq_vec[v].iov_base = page_address(page);
 165                 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
 166                 len -= rqstp->rq_vec[v].iov_len;
 167                 v++;
 168         }
 169
 170         /* Obtain buffer pointer for payload.
 171          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 172          * + 1 (xdr opaque byte count) = 26
 173          */
 174         resp->count = argp->count;
 175         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 176
 177         fh_copy(&resp->fh, &argp->fh);
 178         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 179                                  rqstp->rq_vec, v, &resp->count, &resp->eof);
 180         return rpc_success;
 181 }
 182
 183 /*
 184  * Write data to a file
 185  */
 186 static __be32
 187 nfsd3_proc_write(struct svc_rqst *rqstp)
 188 {
 189         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 190         struct nfsd3_writeres *resp = rqstp->rq_resp;
 191         unsigned long cnt = argp->len;
 192         unsigned int nvecs;
 193
 194         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 195                                 SVCFH_fmt(&argp->fh),
 196                                 argp->len,
 197                                 (unsigned long long) argp->offset,
 198                                 argp->stable? " stable" : "");
 199
 200         fh_copy(&resp->fh, &argp->fh);
 201         resp->committed = argp->stable;
 202         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 203                                       &argp->first, cnt);
 204         if (!nvecs) {
 205                 resp->status = nfserr_io;
 206                 goto out;
 207         }
 208         resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
 209                                   rqstp->rq_vec, nvecs, &cnt,
 210                                   resp->committed, resp->verf);
 211         resp->count = cnt;
 212 out:
 213         return rpc_success;
 214 }
 215
 216 /*
 217  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 218  * At least in theory; we'll see how it fares in practice when the
 219  * first reports about SunOS compatibility problems start to pour in...
 220  */
 221 static __be32
 222 nfsd3_proc_create(struct svc_rqst *rqstp)
 223 {
 224         struct nfsd3_createargs *argp = rqstp->rq_argp;
 225         struct nfsd3_diropres *resp = rqstp->rq_resp;
 226         svc_fh          *dirfhp, *newfhp = NULL;
 227         struct iattr    *attr;
 228
 229         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 230                                 SVCFH_fmt(&argp->fh),
 231                                 argp->len,
 232                                 argp->name);
 233
 234         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 235         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 236         attr   = &argp->attrs;
 237
 238         /* Unfudge the mode bits */
 239         attr->ia_mode &= ~S_IFMT;
 240         if (!(attr->ia_valid & ATTR_MODE)) {
 241                 attr->ia_valid |= ATTR_MODE;
 242                 attr->ia_mode = S_IFREG;
 243         } else {
 244                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 245         }
 246
 247         /* Now create the file and set attributes */
 248         resp->status = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 249                                       attr, newfhp, argp->createmode,
 250                                       (u32 *)argp->verf, NULL, NULL);
 251         return rpc_success;
 252 }
 253
 254 /*
 255  * Make directory. This operation is not idempotent.
 256  */
 257 static __be32
 258 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 259 {
 260         struct nfsd3_createargs *argp = rqstp->rq_argp;
 261         struct nfsd3_diropres *resp = rqstp->rq_resp;
 262
 263         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 264                                 SVCFH_fmt(&argp->fh),
 265                                 argp->len,
 266                                 argp->name);
 267
 268         argp->attrs.ia_valid &= ~ATTR_SIZE;
 269         fh_copy(&resp->dirfh, &argp->fh);
 270         fh_init(&resp->fh, NFS3_FHSIZE);
 271         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 272                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 273         fh_unlock(&resp->dirfh);
 274         return rpc_success;
 275 }
 276
 277 static __be32
 278 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 279 {
 280         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 281         struct nfsd3_diropres *resp = rqstp->rq_resp;
 282
 283         if (argp->tlen == 0) {
 284                 resp->status = nfserr_inval;
 285                 goto out;
 286         }
 287         if (argp->tlen > NFS3_MAXPATHLEN) {
 288                 resp->status = nfserr_nametoolong;
 289                 goto out;
 290         }
 291
 292         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 293                                                 page_address(rqstp->rq_arg.pages[0]),
 294                                                 argp->tlen);
 295         if (IS_ERR(argp->tname)) {
 296                 resp->status = nfserrno(PTR_ERR(argp->tname));
 297                 goto out;
 298         }
 299
 300         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 301                                 SVCFH_fmt(&argp->ffh),
 302                                 argp->flen, argp->fname,
 303                                 argp->tlen, argp->tname);
 304
 305         fh_copy(&resp->dirfh, &argp->ffh);
 306         fh_init(&resp->fh, NFS3_FHSIZE);
 307         resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
 308                                     argp->flen, argp->tname, &resp->fh);
 309         kfree(argp->tname);
 310 out:
 311         return rpc_success;
 312 }
 313
 314 /*
 315  * Make socket/fifo/device.
 316  */
 317 static __be32
 318 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 319 {
 320         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 321         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 322         int type;
 323         dev_t   rdev = 0;
 324
 325         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 326                                 SVCFH_fmt(&argp->fh),
 327                                 argp->len,
 328                                 argp->name);
 329
 330         fh_copy(&resp->dirfh, &argp->fh);
 331         fh_init(&resp->fh, NFS3_FHSIZE);
 332
 333         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 334                 rdev = MKDEV(argp->major, argp->minor);
 335                 if (MAJOR(rdev) != argp->major ||
 336                     MINOR(rdev) != argp->minor) {
 337                         resp->status = nfserr_inval;
 338                         goto out;
 339                 }
 340         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 341                 resp->status = nfserr_badtype;
 342                 goto out;
 343         }
 344
 345         type = nfs3_ftypes[argp->ftype];
 346         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 347                                    &argp->attrs, type, rdev, &resp->fh);
 348         fh_unlock(&resp->dirfh);
 349 out:
 350         return rpc_success;
 351 }
 352
 353 /*
 354  * Remove file/fifo/socket etc.
 355  */
 356 static __be32
 357 nfsd3_proc_remove(struct svc_rqst *rqstp)
 358 {
 359         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 360         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 361
 362         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 363                                 SVCFH_fmt(&argp->fh),
 364                                 argp->len,
 365                                 argp->name);
 366
 367         /* Unlink. -S_IFDIR means file must not be a directory */
 368         fh_copy(&resp->fh, &argp->fh);
 369         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 370                                    argp->name, argp->len);
 371         fh_unlock(&resp->fh);
 372         return rpc_success;
 373 }
 374
 375 /*
 376  * Remove a directory
 377  */
 378 static __be32
 379 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 380 {
 381         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 382         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 383
 384         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 385                                 SVCFH_fmt(&argp->fh),
 386                                 argp->len,
 387                                 argp->name);
 388
 389         fh_copy(&resp->fh, &argp->fh);
 390         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 391                                    argp->name, argp->len);
 392         fh_unlock(&resp->fh);
 393         return rpc_success;
 394 }
 395
 396 static __be32
 397 nfsd3_proc_rename(struct svc_rqst *rqstp)
 398 {
 399         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 400         struct nfsd3_renameres *resp = rqstp->rq_resp;
 401
 402         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 403                                 SVCFH_fmt(&argp->ffh),
 404                                 argp->flen,
 405                                 argp->fname);
 406         dprintk("nfsd: -> %s %.*s\n",
 407                                 SVCFH_fmt(&argp->tfh),
 408                                 argp->tlen,
 409                                 argp->tname);
 410
 411         fh_copy(&resp->ffh, &argp->ffh);
 412         fh_copy(&resp->tfh, &argp->tfh);
 413         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 414                                    &resp->tfh, argp->tname, argp->tlen);
 415         return rpc_success;
 416 }
 417
 418 static __be32
 419 nfsd3_proc_link(struct svc_rqst *rqstp)
 420 {
 421         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 422         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 423
 424         dprintk("nfsd: LINK(3)     %s ->\n",
 425                                 SVCFH_fmt(&argp->ffh));
 426         dprintk("nfsd:   -> %s %.*s\n",
 427                                 SVCFH_fmt(&argp->tfh),
 428                                 argp->tlen,
 429                                 argp->tname);
 430
 431         fh_copy(&resp->fh,  &argp->ffh);
 432         fh_copy(&resp->tfh, &argp->tfh);
 433         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 434                                  &resp->fh);
 435         return rpc_success;
 436 }
 437
 438 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
 439                                      struct nfsd3_readdirres *resp,
 440                                      int count)
 441 {
 442         count = min_t(u32, count, svc_max_payload(rqstp));
 443
 444         /* Convert byte count to number of words (i.e. >> 2),
 445          * and reserve room for the NULL ptr & eof flag (-2 words) */
 446         resp->buflen = (count >> 2) - 2;
 447
 448         resp->buffer = page_address(*rqstp->rq_next_page);
 449         while (count > 0) {
 450                 rqstp->rq_next_page++;
 451                 count -= PAGE_SIZE;
 452         }
 453 }
 454
 455 /*
 456  * Read a portion of a directory.
 457  */
 458 static __be32
 459 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 460 {
 461         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 462         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 463         int             count = 0;
 464         loff_t          offset;
 465         struct page     **p;
 466         caddr_t         page_addr = NULL;
 467
 468         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 469                                 SVCFH_fmt(&argp->fh),
 470                                 argp->count, (u32) argp->cookie);
 471
 472         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 473
 474         /* Read directory and encode entries on the fly */
 475         fh_copy(&resp->fh, &argp->fh);
 476
 477         resp->common.err = nfs_ok;
 478         resp->rqstp = rqstp;
 479         offset = argp->cookie;
 480
 481         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 482                                     &resp->common, nfs3svc_encode_entry);
 483         memcpy(resp->verf, argp->verf, 8);
 484         count = 0;
 485         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 486                 page_addr = page_address(*p);
 487
 488                 if (((caddr_t)resp->buffer >= page_addr) &&
 489                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 490                         count += (caddr_t)resp->buffer - page_addr;
 491                         break;
 492                 }
 493                 count += PAGE_SIZE;
 494         }
 495         resp->count = count >> 2;
 496         if (resp->offset) {
 497                 if (unlikely(resp->offset1)) {
 498                         /* we ended up with offset on a page boundary */
 499                         *resp->offset = htonl(offset >> 32);
 500                         *resp->offset1 = htonl(offset & 0xffffffff);
 501                         resp->offset1 = NULL;
 502                 } else {
 503                         xdr_encode_hyper(resp->offset, offset);
 504                 }
 505                 resp->offset = NULL;
 506         }
 507
 508         return rpc_success;
 509 }
 510
 511 /*
 512  * Read a portion of a directory, including file handles and attrs.
 513  * For now, we choose to ignore the dircount parameter.
 514  */
 515 static __be32
 516 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 517 {
 518         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 519         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 520         int     count = 0;
 521         loff_t  offset;
 522         struct page **p;
 523         caddr_t page_addr = NULL;
 524
 525         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 526                                 SVCFH_fmt(&argp->fh),
 527                                 argp->count, (u32) argp->cookie);
 528
 529         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 530
 531         /* Read directory and encode entries on the fly */
 532         fh_copy(&resp->fh, &argp->fh);
 533
 534         resp->common.err = nfs_ok;
 535         resp->rqstp = rqstp;
 536         offset = argp->cookie;
 537
 538         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 539         if (resp->status != nfs_ok)
 540                 goto out;
 541
 542         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 543                 resp->status = nfserr_notsupp;
 544                 goto out;
 545         }
 546
 547         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 548                                     &resp->common, nfs3svc_encode_entry_plus);
 549         memcpy(resp->verf, argp->verf, 8);
 550         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 551                 page_addr = page_address(*p);
 552
 553                 if (((caddr_t)resp->buffer >= page_addr) &&
 554                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 555                         count += (caddr_t)resp->buffer - page_addr;
 556                         break;
 557                 }
 558                 count += PAGE_SIZE;
 559         }
 560         resp->count = count >> 2;
 561         if (resp->offset) {
 562                 if (unlikely(resp->offset1)) {
 563                         /* we ended up with offset on a page boundary */
 564                         *resp->offset = htonl(offset >> 32);
 565                         *resp->offset1 = htonl(offset & 0xffffffff);
 566                         resp->offset1 = NULL;
 567                 } else {
 568                         xdr_encode_hyper(resp->offset, offset);
 569                 }
 570                 resp->offset = NULL;
 571         }
 572
 573 out:
 574         return rpc_success;
 575 }
 576
 577 /*
 578  * Get file system stats
 579  */
 580 static __be32
 581 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 582 {
 583         struct nfsd_fhandle *argp = rqstp->rq_argp;
 584         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 585
 586         dprintk("nfsd: FSSTAT(3)   %s\n",
 587                                 SVCFH_fmt(&argp->fh));
 588
 589         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 590         fh_put(&argp->fh);
 591         return rpc_success;
 592 }
 593
 594 /*
 595  * Get file system info
 596  */
 597 static __be32
 598 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 599 {
 600         struct nfsd_fhandle *argp = rqstp->rq_argp;
 601         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 602         u32     max_blocksize = svc_max_payload(rqstp);
 603
 604         dprintk("nfsd: FSINFO(3)   %s\n",
 605                                 SVCFH_fmt(&argp->fh));
 606
 607         resp->f_rtmax  = max_blocksize;
 608         resp->f_rtpref = max_blocksize;
 609         resp->f_rtmult = PAGE_SIZE;
 610         resp->f_wtmax  = max_blocksize;
 611         resp->f_wtpref = max_blocksize;
 612         resp->f_wtmult = PAGE_SIZE;
 613         resp->f_dtpref = max_blocksize;
 614         resp->f_maxfilesize = ~(u32) 0;
 615         resp->f_properties = NFS3_FSF_DEFAULT;
 616
 617         resp->status = fh_verify(rqstp, &argp->fh, 0,
 618                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 619
 620         /* Check special features of the file system. May request
 621          * different read/write sizes for file systems known to have
 622          * problems with large blocks */
 623         if (resp->status == nfs_ok) {
 624                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 625
 626                 /* Note that we don't care for remote fs's here */
 627                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 628                         resp->f_properties = NFS3_FSF_BILLYBOY;
 629                 }
 630                 resp->f_maxfilesize = sb->s_maxbytes;
 631         }
 632
 633         fh_put(&argp->fh);
 634         return rpc_success;
 635 }
 636
 637 /*
 638  * Get pathconf info for the specified file
 639  */
 640 static __be32
 641 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 642 {
 643         struct nfsd_fhandle *argp = rqstp->rq_argp;
 644         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 645
 646         dprintk("nfsd: PATHCONF(3) %s\n",
 647                                 SVCFH_fmt(&argp->fh));
 648
 649         /* Set default pathconf */
 650         resp->p_link_max = 255;         /* at least */
 651         resp->p_name_max = 255;         /* at least */
 652         resp->p_no_trunc = 0;
 653         resp->p_chown_restricted = 1;
 654         resp->p_case_insensitive = 0;
 655         resp->p_case_preserving = 1;
 656
 657         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 658
 659         if (resp->status == nfs_ok) {
 660                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 661
 662                 /* Note that we don't care for remote fs's here */
 663                 switch (sb->s_magic) {
 664                 case EXT2_SUPER_MAGIC:
 665                         resp->p_link_max = EXT2_LINK_MAX;
 666                         resp->p_name_max = EXT2_NAME_LEN;
 667                         break;
 668                 case MSDOS_SUPER_MAGIC:
 669                         resp->p_case_insensitive = 1;
 670                         resp->p_case_preserving  = 0;
 671                         break;
 672                 }
 673         }
 674
 675         fh_put(&argp->fh);
 676         return rpc_success;
 677 }
 678
 679 /*
 680  * Commit a file (range) to stable storage.
 681  */
 682 static __be32
 683 nfsd3_proc_commit(struct svc_rqst *rqstp)
 684 {
 685         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 686         struct nfsd3_commitres *resp = rqstp->rq_resp;
 687
 688         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 689                                 SVCFH_fmt(&argp->fh),
 690                                 argp->count,
 691                                 (unsigned long long) argp->offset);
 692
 693         if (argp->offset > NFS_OFFSET_MAX) {
 694                 resp->status = nfserr_inval;
 695                 goto out;
 696         }
 697
 698         fh_copy(&resp->fh, &argp->fh);
 699         resp->status = nfsd_commit(rqstp, &resp->fh, argp->offset,
 700                                    argp->count, resp->verf);
 701 out:
 702         return rpc_success;
 703 }
 704
 705
 706 /*
 707  * NFSv3 Server procedures.
 708  * Only the results of non-idempotent operations are cached.
 709  */
 710 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 711 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 712 #define nfsd3_mkdirargs                 nfsd3_createargs
 713 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 714 #define nfsd3_fhandleargs               nfsd_fhandle
 715 #define nfsd3_attrstatres               nfsd3_attrstat
 716 #define nfsd3_wccstatres                nfsd3_attrstat
 717 #define nfsd3_createres                 nfsd3_diropres
 718
 719 #define ST 1            /* status*/
 720 #define FH 17           /* filehandle with length */
 721 #define AT 21           /* attributes */
 722 #define pAT (1+AT)      /* post attributes - conditional */
 723 #define WC (7+pAT)      /* WCC attributes */
 724
 725 static const struct svc_procedure nfsd_procedures3[22] = {
 726         [NFS3PROC_NULL] = {
 727                 .pc_func = nfsd3_proc_null,
 728                 .pc_decode = nfssvc_decode_voidarg,
 729                 .pc_encode = nfssvc_encode_voidres,
 730                 .pc_argsize = sizeof(struct nfsd_voidargs),
 731                 .pc_ressize = sizeof(struct nfsd_voidres),
 732                 .pc_cachetype = RC_NOCACHE,
 733                 .pc_xdrressize = ST,
 734                 .pc_name = "NULL",
 735         },
 736         [NFS3PROC_GETATTR] = {
 737                 .pc_func = nfsd3_proc_getattr,
 738                 .pc_decode = nfs3svc_decode_fhandleargs,
 739                 .pc_encode = nfs3svc_encode_attrstatres,
 740                 .pc_release = nfs3svc_release_fhandle,
 741                 .pc_argsize = sizeof(struct nfsd_fhandle),
 742                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 743                 .pc_cachetype = RC_NOCACHE,
 744                 .pc_xdrressize = ST+AT,
 745                 .pc_name = "GETATTR",
 746         },
 747         [NFS3PROC_SETATTR] = {
 748                 .pc_func = nfsd3_proc_setattr,
 749                 .pc_decode = nfs3svc_decode_sattrargs,
 750                 .pc_encode = nfs3svc_encode_wccstatres,
 751                 .pc_release = nfs3svc_release_fhandle,
 752                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 753                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 754                 .pc_cachetype = RC_REPLBUFF,
 755                 .pc_xdrressize = ST+WC,
 756                 .pc_name = "SETATTR",
 757         },
 758         [NFS3PROC_LOOKUP] = {
 759                 .pc_func = nfsd3_proc_lookup,
 760                 .pc_decode = nfs3svc_decode_diropargs,
 761                 .pc_encode = nfs3svc_encode_diropres,
 762                 .pc_release = nfs3svc_release_fhandle2,
 763                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 764                 .pc_ressize = sizeof(struct nfsd3_diropres),
 765                 .pc_cachetype = RC_NOCACHE,
 766                 .pc_xdrressize = ST+FH+pAT+pAT,
 767                 .pc_name = "LOOKUP",
 768         },
 769         [NFS3PROC_ACCESS] = {
 770                 .pc_func = nfsd3_proc_access,
 771                 .pc_decode = nfs3svc_decode_accessargs,
 772                 .pc_encode = nfs3svc_encode_accessres,
 773                 .pc_release = nfs3svc_release_fhandle,
 774                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 775                 .pc_ressize = sizeof(struct nfsd3_accessres),
 776                 .pc_cachetype = RC_NOCACHE,
 777                 .pc_xdrressize = ST+pAT+1,
 778                 .pc_name = "ACCESS",
 779         },
 780         [NFS3PROC_READLINK] = {
 781                 .pc_func = nfsd3_proc_readlink,
 782                 .pc_decode = nfs3svc_decode_fhandleargs,
 783                 .pc_encode = nfs3svc_encode_readlinkres,
 784                 .pc_release = nfs3svc_release_fhandle,
 785                 .pc_argsize = sizeof(struct nfsd_fhandle),
 786                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 787                 .pc_cachetype = RC_NOCACHE,
 788                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 789                 .pc_name = "READLINK",
 790         },
 791         [NFS3PROC_READ] = {
 792                 .pc_func = nfsd3_proc_read,
 793                 .pc_decode = nfs3svc_decode_readargs,
 794                 .pc_encode = nfs3svc_encode_readres,
 795                 .pc_release = nfs3svc_release_fhandle,
 796                 .pc_argsize = sizeof(struct nfsd3_readargs),
 797                 .pc_ressize = sizeof(struct nfsd3_readres),
 798                 .pc_cachetype = RC_NOCACHE,
 799                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 800                 .pc_name = "READ",
 801         },
 802         [NFS3PROC_WRITE] = {
 803                 .pc_func = nfsd3_proc_write,
 804                 .pc_decode = nfs3svc_decode_writeargs,
 805                 .pc_encode = nfs3svc_encode_writeres,
 806                 .pc_release = nfs3svc_release_fhandle,
 807                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 808                 .pc_ressize = sizeof(struct nfsd3_writeres),
 809                 .pc_cachetype = RC_REPLBUFF,
 810                 .pc_xdrressize = ST+WC+4,
 811                 .pc_name = "WRITE",
 812         },
 813         [NFS3PROC_CREATE] = {
 814                 .pc_func = nfsd3_proc_create,
 815                 .pc_decode = nfs3svc_decode_createargs,
 816                 .pc_encode = nfs3svc_encode_createres,
 817                 .pc_release = nfs3svc_release_fhandle2,
 818                 .pc_argsize = sizeof(struct nfsd3_createargs),
 819                 .pc_ressize = sizeof(struct nfsd3_createres),
 820                 .pc_cachetype = RC_REPLBUFF,
 821                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 822                 .pc_name = "CREATE",
 823         },
 824         [NFS3PROC_MKDIR] = {
 825                 .pc_func = nfsd3_proc_mkdir,
 826                 .pc_decode = nfs3svc_decode_mkdirargs,
 827                 .pc_encode = nfs3svc_encode_createres,
 828                 .pc_release = nfs3svc_release_fhandle2,
 829                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 830                 .pc_ressize = sizeof(struct nfsd3_createres),
 831                 .pc_cachetype = RC_REPLBUFF,
 832                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 833                 .pc_name = "MKDIR",
 834         },
 835         [NFS3PROC_SYMLINK] = {
 836                 .pc_func = nfsd3_proc_symlink,
 837                 .pc_decode = nfs3svc_decode_symlinkargs,
 838                 .pc_encode = nfs3svc_encode_createres,
 839                 .pc_release = nfs3svc_release_fhandle2,
 840                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 841                 .pc_ressize = sizeof(struct nfsd3_createres),
 842                 .pc_cachetype = RC_REPLBUFF,
 843                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 844                 .pc_name = "SYMLINK",
 845         },
 846         [NFS3PROC_MKNOD] = {
 847                 .pc_func = nfsd3_proc_mknod,
 848                 .pc_decode = nfs3svc_decode_mknodargs,
 849                 .pc_encode = nfs3svc_encode_createres,
 850                 .pc_release = nfs3svc_release_fhandle2,
 851                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 852                 .pc_ressize = sizeof(struct nfsd3_createres),
 853                 .pc_cachetype = RC_REPLBUFF,
 854                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 855                 .pc_name = "MKNOD",
 856         },
 857         [NFS3PROC_REMOVE] = {
 858                 .pc_func = nfsd3_proc_remove,
 859                 .pc_decode = nfs3svc_decode_diropargs,
 860                 .pc_encode = nfs3svc_encode_wccstatres,
 861                 .pc_release = nfs3svc_release_fhandle,
 862                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 863                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 864                 .pc_cachetype = RC_REPLBUFF,
 865                 .pc_xdrressize = ST+WC,
 866                 .pc_name = "REMOVE",
 867         },
 868         [NFS3PROC_RMDIR] = {
 869                 .pc_func = nfsd3_proc_rmdir,
 870                 .pc_decode = nfs3svc_decode_diropargs,
 871                 .pc_encode = nfs3svc_encode_wccstatres,
 872                 .pc_release = nfs3svc_release_fhandle,
 873                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 874                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 875                 .pc_cachetype = RC_REPLBUFF,
 876                 .pc_xdrressize = ST+WC,
 877                 .pc_name = "RMDIR",
 878         },
 879         [NFS3PROC_RENAME] = {
 880                 .pc_func = nfsd3_proc_rename,
 881                 .pc_decode = nfs3svc_decode_renameargs,
 882                 .pc_encode = nfs3svc_encode_renameres,
 883                 .pc_release = nfs3svc_release_fhandle2,
 884                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 885                 .pc_ressize = sizeof(struct nfsd3_renameres),
 886                 .pc_cachetype = RC_REPLBUFF,
 887                 .pc_xdrressize = ST+WC+WC,
 888                 .pc_name = "RENAME",
 889         },
 890         [NFS3PROC_LINK] = {
 891                 .pc_func = nfsd3_proc_link,
 892                 .pc_decode = nfs3svc_decode_linkargs,
 893                 .pc_encode = nfs3svc_encode_linkres,
 894                 .pc_release = nfs3svc_release_fhandle2,
 895                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 896                 .pc_ressize = sizeof(struct nfsd3_linkres),
 897                 .pc_cachetype = RC_REPLBUFF,
 898                 .pc_xdrressize = ST+pAT+WC,
 899                 .pc_name = "LINK",
 900         },
 901         [NFS3PROC_READDIR] = {
 902                 .pc_func = nfsd3_proc_readdir,
 903                 .pc_decode = nfs3svc_decode_readdirargs,
 904                 .pc_encode = nfs3svc_encode_readdirres,
 905                 .pc_release = nfs3svc_release_fhandle,
 906                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 907                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 908                 .pc_cachetype = RC_NOCACHE,
 909                 .pc_name = "READDIR",
 910         },
 911         [NFS3PROC_READDIRPLUS] = {
 912                 .pc_func = nfsd3_proc_readdirplus,
 913                 .pc_decode = nfs3svc_decode_readdirplusargs,
 914                 .pc_encode = nfs3svc_encode_readdirres,
 915                 .pc_release = nfs3svc_release_fhandle,
 916                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 917                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 918                 .pc_cachetype = RC_NOCACHE,
 919                 .pc_name = "READDIRPLUS",
 920         },
 921         [NFS3PROC_FSSTAT] = {
 922                 .pc_func = nfsd3_proc_fsstat,
 923                 .pc_decode = nfs3svc_decode_fhandleargs,
 924                 .pc_encode = nfs3svc_encode_fsstatres,
 925                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 926                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 927                 .pc_cachetype = RC_NOCACHE,
 928                 .pc_xdrressize = ST+pAT+2*6+1,
 929                 .pc_name = "FSSTAT",
 930         },
 931         [NFS3PROC_FSINFO] = {
 932                 .pc_func = nfsd3_proc_fsinfo,
 933                 .pc_decode = nfs3svc_decode_fhandleargs,
 934                 .pc_encode = nfs3svc_encode_fsinfores,
 935                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 936                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 937                 .pc_cachetype = RC_NOCACHE,
 938                 .pc_xdrressize = ST+pAT+12,
 939                 .pc_name = "FSINFO",
 940         },
 941         [NFS3PROC_PATHCONF] = {
 942                 .pc_func = nfsd3_proc_pathconf,
 943                 .pc_decode = nfs3svc_decode_fhandleargs,
 944                 .pc_encode = nfs3svc_encode_pathconfres,
 945                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 946                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 947                 .pc_cachetype = RC_NOCACHE,
 948                 .pc_xdrressize = ST+pAT+6,
 949                 .pc_name = "PATHCONF",
 950         },
 951         [NFS3PROC_COMMIT] = {
 952                 .pc_func = nfsd3_proc_commit,
 953                 .pc_decode = nfs3svc_decode_commitargs,
 954                 .pc_encode = nfs3svc_encode_commitres,
 955                 .pc_release = nfs3svc_release_fhandle,
 956                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 957                 .pc_ressize = sizeof(struct nfsd3_commitres),
 958                 .pc_cachetype = RC_NOCACHE,
 959                 .pc_xdrressize = ST+WC+2,
 960                 .pc_name = "COMMIT",
 961         },
 962 };
 963
 964 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 965 const struct svc_version nfsd_version3 = {
 966         .vs_vers        = 3,
 967         .vs_nproc       = 22,
 968         .vs_proc        = nfsd_procedures3,
 969         .vs_dispatch    = nfsd_dispatch,
 970         .vs_count       = nfsd_count3,
 971         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 972 };