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 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  19
  20 static int      nfs3_ftypes[] = {
  21         0,                      /* NF3NON */
  22         S_IFREG,                /* NF3REG */
  23         S_IFDIR,                /* NF3DIR */
  24         S_IFBLK,                /* NF3BLK */
  25         S_IFCHR,                /* NF3CHR */
  26         S_IFLNK,                /* NF3LNK */
  27         S_IFSOCK,               /* NF3SOCK */
  28         S_IFIFO,                /* NF3FIFO */
  29 };
  30
  31 /*
  32  * NULL call.
  33  */
  34 static __be32
  35 nfsd3_proc_null(struct svc_rqst *rqstp)
  36 {
  37         return nfs_ok;
  38 }
  39
  40 /*
  41  * Get a file's attributes
  42  */
  43 static __be32
  44 nfsd3_proc_getattr(struct svc_rqst *rqstp)
  45 {
  46         struct nfsd_fhandle *argp = rqstp->rq_argp;
  47         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  48         __be32  nfserr;
  49
  50         dprintk("nfsd: GETATTR(3)  %s\n",
  51                 SVCFH_fmt(&argp->fh));
  52
  53         fh_copy(&resp->fh, &argp->fh);
  54         nfserr = fh_verify(rqstp, &resp->fh, 0,
  55                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  56         if (nfserr)
  57                 RETURN_STATUS(nfserr);
  58
  59         nfserr = fh_getattr(&resp->fh, &resp->stat);
  60
  61         RETURN_STATUS(nfserr);
  62 }
  63
  64 /*
  65  * Set a file's attributes
  66  */
  67 static __be32
  68 nfsd3_proc_setattr(struct svc_rqst *rqstp)
  69 {
  70         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  71         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  72         __be32  nfserr;
  73
  74         dprintk("nfsd: SETATTR(3)  %s\n",
  75                                 SVCFH_fmt(&argp->fh));
  76
  77         fh_copy(&resp->fh, &argp->fh);
  78         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  79                               argp->check_guard, argp->guardtime);
  80         RETURN_STATUS(nfserr);
  81 }
  82
  83 /*
  84  * Look up a path name component
  85  */
  86 static __be32
  87 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  88 {
  89         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  90         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  91         __be32  nfserr;
  92
  93         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  94                                 SVCFH_fmt(&argp->fh),
  95                                 argp->len,
  96                                 argp->name);
  97
  98         fh_copy(&resp->dirfh, &argp->fh);
  99         fh_init(&resp->fh, NFS3_FHSIZE);
 100
 101         nfserr = nfsd_lookup(rqstp, &resp->dirfh,
 102                                     argp->name,
 103                                     argp->len,
 104                                     &resp->fh);
 105         RETURN_STATUS(nfserr);
 106 }
 107
 108 /*
 109  * Check file access
 110  */
 111 static __be32
 112 nfsd3_proc_access(struct svc_rqst *rqstp)
 113 {
 114         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 115         struct nfsd3_accessres *resp = rqstp->rq_resp;
 116         __be32  nfserr;
 117
 118         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 119                                 SVCFH_fmt(&argp->fh),
 120                                 argp->access);
 121
 122         fh_copy(&resp->fh, &argp->fh);
 123         resp->access = argp->access;
 124         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 125         RETURN_STATUS(nfserr);
 126 }
 127
 128 /*
 129  * Read a symlink.
 130  */
 131 static __be32
 132 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 133 {
 134         struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
 135         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 136         __be32 nfserr;
 137
 138         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 139
 140         /* Read the symlink. */
 141         fh_copy(&resp->fh, &argp->fh);
 142         resp->len = NFS3_MAXPATHLEN;
 143         nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
 144         RETURN_STATUS(nfserr);
 145 }
 146
 147 /*
 148  * Read a portion of a file.
 149  */
 150 static __be32
 151 nfsd3_proc_read(struct svc_rqst *rqstp)
 152 {
 153         struct nfsd3_readargs *argp = rqstp->rq_argp;
 154         struct nfsd3_readres *resp = rqstp->rq_resp;
 155         __be32  nfserr;
 156         u32     max_blocksize = svc_max_payload(rqstp);
 157         unsigned long cnt = min(argp->count, max_blocksize);
 158
 159         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 160                                 SVCFH_fmt(&argp->fh),
 161                                 (unsigned long) argp->count,
 162                                 (unsigned long long) argp->offset);
 163
 164         /* Obtain buffer pointer for payload.
 165          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 166          * + 1 (xdr opaque byte count) = 26
 167          */
 168         resp->count = cnt;
 169         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 170
 171         fh_copy(&resp->fh, &argp->fh);
 172         nfserr = nfsd_read(rqstp, &resp->fh,
 173                                   argp->offset,
 174                                   rqstp->rq_vec, argp->vlen,
 175                                   &resp->count);
 176         if (nfserr == 0) {
 177                 struct inode    *inode = d_inode(resp->fh.fh_dentry);
 178                 resp->eof = nfsd_eof_on_read(cnt, resp->count, argp->offset,
 179                                                         inode->i_size);
 180         }
 181
 182         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 194         unsigned long cnt = argp->len;
 195         unsigned int nvecs;
 196
 197         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 198                                 SVCFH_fmt(&argp->fh),
 199                                 argp->len,
 200                                 (unsigned long long) argp->offset,
 201                                 argp->stable? " stable" : "");
 202
 203         fh_copy(&resp->fh, &argp->fh);
 204         resp->committed = argp->stable;
 205         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 206                                       &argp->first, cnt);
 207         if (!nvecs)
 208                 RETURN_STATUS(nfserr_io);
 209         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 210                             rqstp->rq_vec, nvecs, &cnt,
 211                             resp->committed);
 212         resp->count = cnt;
 213         RETURN_STATUS(nfserr);
 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         __be32          nfserr;
 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         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 250                                 attr, newfhp,
 251                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
 252
 253         RETURN_STATUS(nfserr);
 254 }
 255
 256 /*
 257  * Make directory. This operation is not idempotent.
 258  */
 259 static __be32
 260 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 261 {
 262         struct nfsd3_createargs *argp = rqstp->rq_argp;
 263         struct nfsd3_diropres *resp = rqstp->rq_resp;
 264         __be32  nfserr;
 265
 266         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 267                                 SVCFH_fmt(&argp->fh),
 268                                 argp->len,
 269                                 argp->name);
 270
 271         argp->attrs.ia_valid &= ~ATTR_SIZE;
 272         fh_copy(&resp->dirfh, &argp->fh);
 273         fh_init(&resp->fh, NFS3_FHSIZE);
 274         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 275                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 276         fh_unlock(&resp->dirfh);
 277         RETURN_STATUS(nfserr);
 278 }
 279
 280 static __be32
 281 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 282 {
 283         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 284         struct nfsd3_diropres *resp = rqstp->rq_resp;
 285         __be32  nfserr;
 286
 287         if (argp->tlen == 0)
 288                 RETURN_STATUS(nfserr_inval);
 289         if (argp->tlen > NFS3_MAXPATHLEN)
 290                 RETURN_STATUS(nfserr_nametoolong);
 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                 RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
 297
 298         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 299                                 SVCFH_fmt(&argp->ffh),
 300                                 argp->flen, argp->fname,
 301                                 argp->tlen, argp->tname);
 302
 303         fh_copy(&resp->dirfh, &argp->ffh);
 304         fh_init(&resp->fh, NFS3_FHSIZE);
 305         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 306                                                    argp->tname, &resp->fh);
 307         kfree(argp->tname);
 308         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 320         int type;
 321         dev_t   rdev = 0;
 322
 323         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 324                                 SVCFH_fmt(&argp->fh),
 325                                 argp->len,
 326                                 argp->name);
 327
 328         fh_copy(&resp->dirfh, &argp->fh);
 329         fh_init(&resp->fh, NFS3_FHSIZE);
 330
 331         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 332                 RETURN_STATUS(nfserr_inval);
 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                         RETURN_STATUS(nfserr_inval);
 338         } else
 339                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 340                         RETURN_STATUS(nfserr_inval);
 341
 342         type = nfs3_ftypes[argp->ftype];
 343         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 344                                     &argp->attrs, type, rdev, &resp->fh);
 345         fh_unlock(&resp->dirfh);
 346         RETURN_STATUS(nfserr);
 347 }
 348
 349 /*
 350  * Remove file/fifo/socket etc.
 351  */
 352 static __be32
 353 nfsd3_proc_remove(struct svc_rqst *rqstp)
 354 {
 355         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 356         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 357         __be32  nfserr;
 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         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 367         fh_unlock(&resp->fh);
 368         RETURN_STATUS(nfserr);
 369 }
 370
 371 /*
 372  * Remove a directory
 373  */
 374 static __be32
 375 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 376 {
 377         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 378         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 379         __be32  nfserr;
 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         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 388         fh_unlock(&resp->fh);
 389         RETURN_STATUS(nfserr);
 390 }
 391
 392 static __be32
 393 nfsd3_proc_rename(struct svc_rqst *rqstp)
 394 {
 395         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 396         struct nfsd3_renameres *resp = rqstp->rq_resp;
 397         __be32  nfserr;
 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         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 411                                     &resp->tfh, argp->tname, argp->tlen);
 412         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 421
 422         dprintk("nfsd: LINK(3)     %s ->\n",
 423                                 SVCFH_fmt(&argp->ffh));
 424         dprintk("nfsd:   -> %s %.*s\n",
 425                                 SVCFH_fmt(&argp->tfh),
 426                                 argp->tlen,
 427                                 argp->tname);
 428
 429         fh_copy(&resp->fh,  &argp->ffh);
 430         fh_copy(&resp->tfh, &argp->tfh);
 431         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 432                                   &resp->fh);
 433         RETURN_STATUS(nfserr);
 434 }
 435
 436 /*
 437  * Read a portion of a directory.
 438  */
 439 static __be32
 440 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 441 {
 442         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 443         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 444         __be32          nfserr;
 445         int             count;
 446
 447         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 448                                 SVCFH_fmt(&argp->fh),
 449                                 argp->count, (u32) argp->cookie);
 450
 451         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 452          * client read size */
 453         count = (argp->count >> 2) - 2;
 454
 455         /* Read directory and encode entries on the fly */
 456         fh_copy(&resp->fh, &argp->fh);
 457
 458         resp->buflen = count;
 459         resp->common.err = nfs_ok;
 460         resp->buffer = argp->buffer;
 461         resp->rqstp = rqstp;
 462         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
 463                                         &resp->common, nfs3svc_encode_entry);
 464         memcpy(resp->verf, argp->verf, 8);
 465         resp->count = resp->buffer - argp->buffer;
 466         if (resp->offset) {
 467                 loff_t offset = argp->cookie;
 468
 469                 if (unlikely(resp->offset1)) {
 470                         /* we ended up with offset on a page boundary */
 471                         *resp->offset = htonl(offset >> 32);
 472                         *resp->offset1 = htonl(offset & 0xffffffff);
 473                         resp->offset1 = NULL;
 474                 } else {
 475                         xdr_encode_hyper(resp->offset, offset);
 476                 }
 477                 resp->offset = NULL;
 478         }
 479
 480         RETURN_STATUS(nfserr);
 481 }
 482
 483 /*
 484  * Read a portion of a directory, including file handles and attrs.
 485  * For now, we choose to ignore the dircount parameter.
 486  */
 487 static __be32
 488 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 489 {
 490         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 491         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 492         __be32  nfserr;
 493         int     count = 0;
 494         loff_t  offset;
 495         struct page **p;
 496         caddr_t page_addr = NULL;
 497
 498         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 499                                 SVCFH_fmt(&argp->fh),
 500                                 argp->count, (u32) argp->cookie);
 501
 502         /* Convert byte count to number of words (i.e. >> 2),
 503          * and reserve room for the NULL ptr & eof flag (-2 words) */
 504         resp->count = (argp->count >> 2) - 2;
 505
 506         /* Read directory and encode entries on the fly */
 507         fh_copy(&resp->fh, &argp->fh);
 508
 509         resp->common.err = nfs_ok;
 510         resp->buffer = argp->buffer;
 511         resp->buflen = resp->count;
 512         resp->rqstp = rqstp;
 513         offset = argp->cookie;
 514
 515         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 516         if (nfserr)
 517                 RETURN_STATUS(nfserr);
 518
 519         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 520                 RETURN_STATUS(nfserr_notsupp);
 521
 522         nfserr = nfsd_readdir(rqstp, &resp->fh,
 523                                      &offset,
 524                                      &resp->common,
 525                                      nfs3svc_encode_entry_plus);
 526         memcpy(resp->verf, argp->verf, 8);
 527         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 528                 page_addr = page_address(*p);
 529
 530                 if (((caddr_t)resp->buffer >= page_addr) &&
 531                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 532                         count += (caddr_t)resp->buffer - page_addr;
 533                         break;
 534                 }
 535                 count += PAGE_SIZE;
 536         }
 537         resp->count = count >> 2;
 538         if (resp->offset) {
 539                 if (unlikely(resp->offset1)) {
 540                         /* we ended up with offset on a page boundary */
 541                         *resp->offset = htonl(offset >> 32);
 542                         *resp->offset1 = htonl(offset & 0xffffffff);
 543                         resp->offset1 = NULL;
 544                 } else {
 545                         xdr_encode_hyper(resp->offset, offset);
 546                 }
 547                 resp->offset = NULL;
 548         }
 549
 550         RETURN_STATUS(nfserr);
 551 }
 552
 553 /*
 554  * Get file system stats
 555  */
 556 static __be32
 557 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 558 {
 559         struct nfsd_fhandle *argp = rqstp->rq_argp;
 560         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 561         __be32  nfserr;
 562
 563         dprintk("nfsd: FSSTAT(3)   %s\n",
 564                                 SVCFH_fmt(&argp->fh));
 565
 566         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 567         fh_put(&argp->fh);
 568         RETURN_STATUS(nfserr);
 569 }
 570
 571 /*
 572  * Get file system info
 573  */
 574 static __be32
 575 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 576 {
 577         struct nfsd_fhandle *argp = rqstp->rq_argp;
 578         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 579         __be32  nfserr;
 580         u32     max_blocksize = svc_max_payload(rqstp);
 581
 582         dprintk("nfsd: FSINFO(3)   %s\n",
 583                                 SVCFH_fmt(&argp->fh));
 584
 585         resp->f_rtmax  = max_blocksize;
 586         resp->f_rtpref = max_blocksize;
 587         resp->f_rtmult = PAGE_SIZE;
 588         resp->f_wtmax  = max_blocksize;
 589         resp->f_wtpref = max_blocksize;
 590         resp->f_wtmult = PAGE_SIZE;
 591         resp->f_dtpref = PAGE_SIZE;
 592         resp->f_maxfilesize = ~(u32) 0;
 593         resp->f_properties = NFS3_FSF_DEFAULT;
 594
 595         nfserr = fh_verify(rqstp, &argp->fh, 0,
 596                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 597
 598         /* Check special features of the file system. May request
 599          * different read/write sizes for file systems known to have
 600          * problems with large blocks */
 601         if (nfserr == 0) {
 602                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 603
 604                 /* Note that we don't care for remote fs's here */
 605                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 606                         resp->f_properties = NFS3_FSF_BILLYBOY;
 607                 }
 608                 resp->f_maxfilesize = sb->s_maxbytes;
 609         }
 610
 611         fh_put(&argp->fh);
 612         RETURN_STATUS(nfserr);
 613 }
 614
 615 /*
 616  * Get pathconf info for the specified file
 617  */
 618 static __be32
 619 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 620 {
 621         struct nfsd_fhandle *argp = rqstp->rq_argp;
 622         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 623         __be32  nfserr;
 624
 625         dprintk("nfsd: PATHCONF(3) %s\n",
 626                                 SVCFH_fmt(&argp->fh));
 627
 628         /* Set default pathconf */
 629         resp->p_link_max = 255;         /* at least */
 630         resp->p_name_max = 255;         /* at least */
 631         resp->p_no_trunc = 0;
 632         resp->p_chown_restricted = 1;
 633         resp->p_case_insensitive = 0;
 634         resp->p_case_preserving = 1;
 635
 636         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 637
 638         if (nfserr == 0) {
 639                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 640
 641                 /* Note that we don't care for remote fs's here */
 642                 switch (sb->s_magic) {
 643                 case EXT2_SUPER_MAGIC:
 644                         resp->p_link_max = EXT2_LINK_MAX;
 645                         resp->p_name_max = EXT2_NAME_LEN;
 646                         break;
 647                 case MSDOS_SUPER_MAGIC:
 648                         resp->p_case_insensitive = 1;
 649                         resp->p_case_preserving  = 0;
 650                         break;
 651                 }
 652         }
 653
 654         fh_put(&argp->fh);
 655         RETURN_STATUS(nfserr);
 656 }
 657
 658
 659 /*
 660  * Commit a file (range) to stable storage.
 661  */
 662 static __be32
 663 nfsd3_proc_commit(struct svc_rqst *rqstp)
 664 {
 665         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 666         struct nfsd3_commitres *resp = rqstp->rq_resp;
 667         __be32  nfserr;
 668
 669         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 670                                 SVCFH_fmt(&argp->fh),
 671                                 argp->count,
 672                                 (unsigned long long) argp->offset);
 673
 674         if (argp->offset > NFS_OFFSET_MAX)
 675                 RETURN_STATUS(nfserr_inval);
 676
 677         fh_copy(&resp->fh, &argp->fh);
 678         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 679
 680         RETURN_STATUS(nfserr);
 681 }
 682
 683
 684 /*
 685  * NFSv3 Server procedures.
 686  * Only the results of non-idempotent operations are cached.
 687  */
 688 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 689 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 690 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 691 #define nfsd3_mkdirargs                 nfsd3_createargs
 692 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 693 #define nfsd3_fhandleargs               nfsd_fhandle
 694 #define nfsd3_fhandleres                nfsd3_attrstat
 695 #define nfsd3_attrstatres               nfsd3_attrstat
 696 #define nfsd3_wccstatres                nfsd3_attrstat
 697 #define nfsd3_createres                 nfsd3_diropres
 698 #define nfsd3_voidres                   nfsd3_voidargs
 699 struct nfsd3_voidargs { int dummy; };
 700
 701 #define ST 1            /* status*/
 702 #define FH 17           /* filehandle with length */
 703 #define AT 21           /* attributes */
 704 #define pAT (1+AT)      /* post attributes - conditional */
 705 #define WC (7+pAT)      /* WCC attributes */
 706
 707 static const struct svc_procedure nfsd_procedures3[22] = {
 708         [NFS3PROC_NULL] = {
 709                 .pc_func = nfsd3_proc_null,
 710                 .pc_encode = nfs3svc_encode_voidres,
 711                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 712                 .pc_ressize = sizeof(struct nfsd3_voidres),
 713                 .pc_cachetype = RC_NOCACHE,
 714                 .pc_xdrressize = ST,
 715         },
 716         [NFS3PROC_GETATTR] = {
 717                 .pc_func = nfsd3_proc_getattr,
 718                 .pc_decode = nfs3svc_decode_fhandleargs,
 719                 .pc_encode = nfs3svc_encode_attrstatres,
 720                 .pc_release = nfs3svc_release_fhandle,
 721                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 722                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 723                 .pc_cachetype = RC_NOCACHE,
 724                 .pc_xdrressize = ST+AT,
 725         },
 726         [NFS3PROC_SETATTR] = {
 727                 .pc_func = nfsd3_proc_setattr,
 728                 .pc_decode = nfs3svc_decode_sattrargs,
 729                 .pc_encode = nfs3svc_encode_wccstatres,
 730                 .pc_release = nfs3svc_release_fhandle,
 731                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 732                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 733                 .pc_cachetype = RC_REPLBUFF,
 734                 .pc_xdrressize = ST+WC,
 735         },
 736         [NFS3PROC_LOOKUP] = {
 737                 .pc_func = nfsd3_proc_lookup,
 738                 .pc_decode = nfs3svc_decode_diropargs,
 739                 .pc_encode = nfs3svc_encode_diropres,
 740                 .pc_release = nfs3svc_release_fhandle2,
 741                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 742                 .pc_ressize = sizeof(struct nfsd3_diropres),
 743                 .pc_cachetype = RC_NOCACHE,
 744                 .pc_xdrressize = ST+FH+pAT+pAT,
 745         },
 746         [NFS3PROC_ACCESS] = {
 747                 .pc_func = nfsd3_proc_access,
 748                 .pc_decode = nfs3svc_decode_accessargs,
 749                 .pc_encode = nfs3svc_encode_accessres,
 750                 .pc_release = nfs3svc_release_fhandle,
 751                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 752                 .pc_ressize = sizeof(struct nfsd3_accessres),
 753                 .pc_cachetype = RC_NOCACHE,
 754                 .pc_xdrressize = ST+pAT+1,
 755         },
 756         [NFS3PROC_READLINK] = {
 757                 .pc_func = nfsd3_proc_readlink,
 758                 .pc_decode = nfs3svc_decode_readlinkargs,
 759                 .pc_encode = nfs3svc_encode_readlinkres,
 760                 .pc_release = nfs3svc_release_fhandle,
 761                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 762                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 763                 .pc_cachetype = RC_NOCACHE,
 764                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 765         },
 766         [NFS3PROC_READ] = {
 767                 .pc_func = nfsd3_proc_read,
 768                 .pc_decode = nfs3svc_decode_readargs,
 769                 .pc_encode = nfs3svc_encode_readres,
 770                 .pc_release = nfs3svc_release_fhandle,
 771                 .pc_argsize = sizeof(struct nfsd3_readargs),
 772                 .pc_ressize = sizeof(struct nfsd3_readres),
 773                 .pc_cachetype = RC_NOCACHE,
 774                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 775         },
 776         [NFS3PROC_WRITE] = {
 777                 .pc_func = nfsd3_proc_write,
 778                 .pc_decode = nfs3svc_decode_writeargs,
 779                 .pc_encode = nfs3svc_encode_writeres,
 780                 .pc_release = nfs3svc_release_fhandle,
 781                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 782                 .pc_ressize = sizeof(struct nfsd3_writeres),
 783                 .pc_cachetype = RC_REPLBUFF,
 784                 .pc_xdrressize = ST+WC+4,
 785         },
 786         [NFS3PROC_CREATE] = {
 787                 .pc_func = nfsd3_proc_create,
 788                 .pc_decode = nfs3svc_decode_createargs,
 789                 .pc_encode = nfs3svc_encode_createres,
 790                 .pc_release = nfs3svc_release_fhandle2,
 791                 .pc_argsize = sizeof(struct nfsd3_createargs),
 792                 .pc_ressize = sizeof(struct nfsd3_createres),
 793                 .pc_cachetype = RC_REPLBUFF,
 794                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 795         },
 796         [NFS3PROC_MKDIR] = {
 797                 .pc_func = nfsd3_proc_mkdir,
 798                 .pc_decode = nfs3svc_decode_mkdirargs,
 799                 .pc_encode = nfs3svc_encode_createres,
 800                 .pc_release = nfs3svc_release_fhandle2,
 801                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 802                 .pc_ressize = sizeof(struct nfsd3_createres),
 803                 .pc_cachetype = RC_REPLBUFF,
 804                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 805         },
 806         [NFS3PROC_SYMLINK] = {
 807                 .pc_func = nfsd3_proc_symlink,
 808                 .pc_decode = nfs3svc_decode_symlinkargs,
 809                 .pc_encode = nfs3svc_encode_createres,
 810                 .pc_release = nfs3svc_release_fhandle2,
 811                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 812                 .pc_ressize = sizeof(struct nfsd3_createres),
 813                 .pc_cachetype = RC_REPLBUFF,
 814                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 815         },
 816         [NFS3PROC_MKNOD] = {
 817                 .pc_func = nfsd3_proc_mknod,
 818                 .pc_decode = nfs3svc_decode_mknodargs,
 819                 .pc_encode = nfs3svc_encode_createres,
 820                 .pc_release = nfs3svc_release_fhandle2,
 821                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 822                 .pc_ressize = sizeof(struct nfsd3_createres),
 823                 .pc_cachetype = RC_REPLBUFF,
 824                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 825         },
 826         [NFS3PROC_REMOVE] = {
 827                 .pc_func = nfsd3_proc_remove,
 828                 .pc_decode = nfs3svc_decode_diropargs,
 829                 .pc_encode = nfs3svc_encode_wccstatres,
 830                 .pc_release = nfs3svc_release_fhandle,
 831                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 832                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 833                 .pc_cachetype = RC_REPLBUFF,
 834                 .pc_xdrressize = ST+WC,
 835         },
 836         [NFS3PROC_RMDIR] = {
 837                 .pc_func = nfsd3_proc_rmdir,
 838                 .pc_decode = nfs3svc_decode_diropargs,
 839                 .pc_encode = nfs3svc_encode_wccstatres,
 840                 .pc_release = nfs3svc_release_fhandle,
 841                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 842                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 843                 .pc_cachetype = RC_REPLBUFF,
 844                 .pc_xdrressize = ST+WC,
 845         },
 846         [NFS3PROC_RENAME] = {
 847                 .pc_func = nfsd3_proc_rename,
 848                 .pc_decode = nfs3svc_decode_renameargs,
 849                 .pc_encode = nfs3svc_encode_renameres,
 850                 .pc_release = nfs3svc_release_fhandle2,
 851                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 852                 .pc_ressize = sizeof(struct nfsd3_renameres),
 853                 .pc_cachetype = RC_REPLBUFF,
 854                 .pc_xdrressize = ST+WC+WC,
 855         },
 856         [NFS3PROC_LINK] = {
 857                 .pc_func = nfsd3_proc_link,
 858                 .pc_decode = nfs3svc_decode_linkargs,
 859                 .pc_encode = nfs3svc_encode_linkres,
 860                 .pc_release = nfs3svc_release_fhandle2,
 861                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 862                 .pc_ressize = sizeof(struct nfsd3_linkres),
 863                 .pc_cachetype = RC_REPLBUFF,
 864                 .pc_xdrressize = ST+pAT+WC,
 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         },
 875         [NFS3PROC_READDIRPLUS] = {
 876                 .pc_func = nfsd3_proc_readdirplus,
 877                 .pc_decode = nfs3svc_decode_readdirplusargs,
 878                 .pc_encode = nfs3svc_encode_readdirres,
 879                 .pc_release = nfs3svc_release_fhandle,
 880                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 881                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 882                 .pc_cachetype = RC_NOCACHE,
 883         },
 884         [NFS3PROC_FSSTAT] = {
 885                 .pc_func = nfsd3_proc_fsstat,
 886                 .pc_decode = nfs3svc_decode_fhandleargs,
 887                 .pc_encode = nfs3svc_encode_fsstatres,
 888                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 889                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 890                 .pc_cachetype = RC_NOCACHE,
 891                 .pc_xdrressize = ST+pAT+2*6+1,
 892         },
 893         [NFS3PROC_FSINFO] = {
 894                 .pc_func = nfsd3_proc_fsinfo,
 895                 .pc_decode = nfs3svc_decode_fhandleargs,
 896                 .pc_encode = nfs3svc_encode_fsinfores,
 897                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 898                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 899                 .pc_cachetype = RC_NOCACHE,
 900                 .pc_xdrressize = ST+pAT+12,
 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         },
 911         [NFS3PROC_COMMIT] = {
 912                 .pc_func = nfsd3_proc_commit,
 913                 .pc_decode = nfs3svc_decode_commitargs,
 914                 .pc_encode = nfs3svc_encode_commitres,
 915                 .pc_release = nfs3svc_release_fhandle,
 916                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 917                 .pc_ressize = sizeof(struct nfsd3_commitres),
 918                 .pc_cachetype = RC_NOCACHE,
 919                 .pc_xdrressize = ST+WC+2,
 920         },
 921 };
 922
 923 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 924 const struct svc_version nfsd_version3 = {
 925         .vs_vers        = 3,
 926         .vs_nproc       = 22,
 927         .vs_proc        = nfsd_procedures3,
 928         .vs_dispatch    = nfsd_dispatch,
 929         .vs_count       = nfsd_count3,
 930         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 931 };