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 #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         resp->status = nfserr_fbig;
 204         if (argp->offset > (u64)OFFSET_MAX ||
 205             argp->offset + argp->len > (u64)OFFSET_MAX)
 206                 return rpc_success;
 207
 208         fh_copy(&resp->fh, &argp->fh);
 209         resp->committed = argp->stable;
 210         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 211                                       &argp->first, cnt);
 212         if (!nvecs)
 213                 RETURN_STATUS(nfserr_io);
 214         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 215                             rqstp->rq_vec, nvecs, &cnt,
 216                             resp->committed);
 217         resp->count = cnt;
 218         RETURN_STATUS(nfserr);
 219 }
 220
 221 /*
 222  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 223  * At least in theory; we'll see how it fares in practice when the
 224  * first reports about SunOS compatibility problems start to pour in...
 225  */
 226 static __be32
 227 nfsd3_proc_create(struct svc_rqst *rqstp)
 228 {
 229         struct nfsd3_createargs *argp = rqstp->rq_argp;
 230         struct nfsd3_diropres *resp = rqstp->rq_resp;
 231         svc_fh          *dirfhp, *newfhp = NULL;
 232         struct iattr    *attr;
 233         __be32          nfserr;
 234
 235         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 236                                 SVCFH_fmt(&argp->fh),
 237                                 argp->len,
 238                                 argp->name);
 239
 240         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 241         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 242         attr   = &argp->attrs;
 243
 244         /* Unfudge the mode bits */
 245         attr->ia_mode &= ~S_IFMT;
 246         if (!(attr->ia_valid & ATTR_MODE)) {
 247                 attr->ia_valid |= ATTR_MODE;
 248                 attr->ia_mode = S_IFREG;
 249         } else {
 250                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 251         }
 252
 253         /* Now create the file and set attributes */
 254         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 255                                 attr, newfhp,
 256                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
 257
 258         RETURN_STATUS(nfserr);
 259 }
 260
 261 /*
 262  * Make directory. This operation is not idempotent.
 263  */
 264 static __be32
 265 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 266 {
 267         struct nfsd3_createargs *argp = rqstp->rq_argp;
 268         struct nfsd3_diropres *resp = rqstp->rq_resp;
 269         __be32  nfserr;
 270
 271         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 272                                 SVCFH_fmt(&argp->fh),
 273                                 argp->len,
 274                                 argp->name);
 275
 276         argp->attrs.ia_valid &= ~ATTR_SIZE;
 277         fh_copy(&resp->dirfh, &argp->fh);
 278         fh_init(&resp->fh, NFS3_FHSIZE);
 279         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 280                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 281         fh_unlock(&resp->dirfh);
 282         RETURN_STATUS(nfserr);
 283 }
 284
 285 static __be32
 286 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 287 {
 288         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 289         struct nfsd3_diropres *resp = rqstp->rq_resp;
 290         __be32  nfserr;
 291
 292         if (argp->tlen == 0)
 293                 RETURN_STATUS(nfserr_inval);
 294         if (argp->tlen > NFS3_MAXPATHLEN)
 295                 RETURN_STATUS(nfserr_nametoolong);
 296
 297         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 298                                                 page_address(rqstp->rq_arg.pages[0]),
 299                                                 argp->tlen);
 300         if (IS_ERR(argp->tname))
 301                 RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
 302
 303         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 304                                 SVCFH_fmt(&argp->ffh),
 305                                 argp->flen, argp->fname,
 306                                 argp->tlen, argp->tname);
 307
 308         fh_copy(&resp->dirfh, &argp->ffh);
 309         fh_init(&resp->fh, NFS3_FHSIZE);
 310         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 311                                                    argp->tname, &resp->fh);
 312         kfree(argp->tname);
 313         RETURN_STATUS(nfserr);
 314 }
 315
 316 /*
 317  * Make socket/fifo/device.
 318  */
 319 static __be32
 320 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 321 {
 322         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 323         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 324         __be32  nfserr;
 325         int type;
 326         dev_t   rdev = 0;
 327
 328         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 329                                 SVCFH_fmt(&argp->fh),
 330                                 argp->len,
 331                                 argp->name);
 332
 333         fh_copy(&resp->dirfh, &argp->fh);
 334         fh_init(&resp->fh, NFS3_FHSIZE);
 335
 336         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 337                 RETURN_STATUS(nfserr_inval);
 338         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 339                 rdev = MKDEV(argp->major, argp->minor);
 340                 if (MAJOR(rdev) != argp->major ||
 341                     MINOR(rdev) != argp->minor)
 342                         RETURN_STATUS(nfserr_inval);
 343         } else
 344                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 345                         RETURN_STATUS(nfserr_inval);
 346
 347         type = nfs3_ftypes[argp->ftype];
 348         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 349                                     &argp->attrs, type, rdev, &resp->fh);
 350         fh_unlock(&resp->dirfh);
 351         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 363
 364         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 365                                 SVCFH_fmt(&argp->fh),
 366                                 argp->len,
 367                                 argp->name);
 368
 369         /* Unlink. -S_IFDIR means file must not be a directory */
 370         fh_copy(&resp->fh, &argp->fh);
 371         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 372         fh_unlock(&resp->fh);
 373         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 385
 386         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 387                                 SVCFH_fmt(&argp->fh),
 388                                 argp->len,
 389                                 argp->name);
 390
 391         fh_copy(&resp->fh, &argp->fh);
 392         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 393         fh_unlock(&resp->fh);
 394         RETURN_STATUS(nfserr);
 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         __be32  nfserr;
 403
 404         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 405                                 SVCFH_fmt(&argp->ffh),
 406                                 argp->flen,
 407                                 argp->fname);
 408         dprintk("nfsd: -> %s %.*s\n",
 409                                 SVCFH_fmt(&argp->tfh),
 410                                 argp->tlen,
 411                                 argp->tname);
 412
 413         fh_copy(&resp->ffh, &argp->ffh);
 414         fh_copy(&resp->tfh, &argp->tfh);
 415         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 416                                     &resp->tfh, argp->tname, argp->tlen);
 417         RETURN_STATUS(nfserr);
 418 }
 419
 420 static __be32
 421 nfsd3_proc_link(struct svc_rqst *rqstp)
 422 {
 423         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 424         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 425         __be32  nfserr;
 426
 427         dprintk("nfsd: LINK(3)     %s ->\n",
 428                                 SVCFH_fmt(&argp->ffh));
 429         dprintk("nfsd:   -> %s %.*s\n",
 430                                 SVCFH_fmt(&argp->tfh),
 431                                 argp->tlen,
 432                                 argp->tname);
 433
 434         fh_copy(&resp->fh,  &argp->ffh);
 435         fh_copy(&resp->tfh, &argp->tfh);
 436         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 437                                   &resp->fh);
 438         RETURN_STATUS(nfserr);
 439 }
 440
 441 /*
 442  * Read a portion of a directory.
 443  */
 444 static __be32
 445 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 446 {
 447         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 448         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 449         __be32          nfserr;
 450         int             count;
 451
 452         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 453                                 SVCFH_fmt(&argp->fh),
 454                                 argp->count, (u32) argp->cookie);
 455
 456         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 457          * client read size */
 458         count = (argp->count >> 2) - 2;
 459
 460         /* Read directory and encode entries on the fly */
 461         fh_copy(&resp->fh, &argp->fh);
 462
 463         resp->buflen = count;
 464         resp->common.err = nfs_ok;
 465         resp->buffer = argp->buffer;
 466         resp->rqstp = rqstp;
 467         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
 468                                         &resp->common, nfs3svc_encode_entry);
 469         memcpy(resp->verf, argp->verf, 8);
 470         resp->count = resp->buffer - argp->buffer;
 471         if (resp->offset) {
 472                 loff_t offset = argp->cookie;
 473
 474                 if (unlikely(resp->offset1)) {
 475                         /* we ended up with offset on a page boundary */
 476                         *resp->offset = htonl(offset >> 32);
 477                         *resp->offset1 = htonl(offset & 0xffffffff);
 478                         resp->offset1 = NULL;
 479                 } else {
 480                         xdr_encode_hyper(resp->offset, offset);
 481                 }
 482                 resp->offset = NULL;
 483         }
 484
 485         RETURN_STATUS(nfserr);
 486 }
 487
 488 /*
 489  * Read a portion of a directory, including file handles and attrs.
 490  * For now, we choose to ignore the dircount parameter.
 491  */
 492 static __be32
 493 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 494 {
 495         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 496         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 497         __be32  nfserr;
 498         int     count = 0;
 499         loff_t  offset;
 500         struct page **p;
 501         caddr_t page_addr = NULL;
 502
 503         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 504                                 SVCFH_fmt(&argp->fh),
 505                                 argp->count, (u32) argp->cookie);
 506
 507         /* Convert byte count to number of words (i.e. >> 2),
 508          * and reserve room for the NULL ptr & eof flag (-2 words) */
 509         resp->count = (argp->count >> 2) - 2;
 510
 511         /* Read directory and encode entries on the fly */
 512         fh_copy(&resp->fh, &argp->fh);
 513
 514         resp->common.err = nfs_ok;
 515         resp->buffer = argp->buffer;
 516         resp->buflen = resp->count;
 517         resp->rqstp = rqstp;
 518         offset = argp->cookie;
 519
 520         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 521         if (nfserr)
 522                 RETURN_STATUS(nfserr);
 523
 524         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 525                 RETURN_STATUS(nfserr_notsupp);
 526
 527         nfserr = nfsd_readdir(rqstp, &resp->fh,
 528                                      &offset,
 529                                      &resp->common,
 530                                      nfs3svc_encode_entry_plus);
 531         memcpy(resp->verf, argp->verf, 8);
 532         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 533                 page_addr = page_address(*p);
 534
 535                 if (((caddr_t)resp->buffer >= page_addr) &&
 536                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 537                         count += (caddr_t)resp->buffer - page_addr;
 538                         break;
 539                 }
 540                 count += PAGE_SIZE;
 541         }
 542         resp->count = count >> 2;
 543         if (resp->offset) {
 544                 if (unlikely(resp->offset1)) {
 545                         /* we ended up with offset on a page boundary */
 546                         *resp->offset = htonl(offset >> 32);
 547                         *resp->offset1 = htonl(offset & 0xffffffff);
 548                         resp->offset1 = NULL;
 549                 } else {
 550                         xdr_encode_hyper(resp->offset, offset);
 551                 }
 552                 resp->offset = NULL;
 553         }
 554
 555         RETURN_STATUS(nfserr);
 556 }
 557
 558 /*
 559  * Get file system stats
 560  */
 561 static __be32
 562 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 563 {
 564         struct nfsd_fhandle *argp = rqstp->rq_argp;
 565         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 566         __be32  nfserr;
 567
 568         dprintk("nfsd: FSSTAT(3)   %s\n",
 569                                 SVCFH_fmt(&argp->fh));
 570
 571         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 572         fh_put(&argp->fh);
 573         RETURN_STATUS(nfserr);
 574 }
 575
 576 /*
 577  * Get file system info
 578  */
 579 static __be32
 580 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 581 {
 582         struct nfsd_fhandle *argp = rqstp->rq_argp;
 583         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 584         __be32  nfserr;
 585         u32     max_blocksize = svc_max_payload(rqstp);
 586
 587         dprintk("nfsd: FSINFO(3)   %s\n",
 588                                 SVCFH_fmt(&argp->fh));
 589
 590         resp->f_rtmax  = max_blocksize;
 591         resp->f_rtpref = max_blocksize;
 592         resp->f_rtmult = PAGE_SIZE;
 593         resp->f_wtmax  = max_blocksize;
 594         resp->f_wtpref = max_blocksize;
 595         resp->f_wtmult = PAGE_SIZE;
 596         resp->f_dtpref = PAGE_SIZE;
 597         resp->f_maxfilesize = ~(u32) 0;
 598         resp->f_properties = NFS3_FSF_DEFAULT;
 599
 600         nfserr = fh_verify(rqstp, &argp->fh, 0,
 601                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 602
 603         /* Check special features of the file system. May request
 604          * different read/write sizes for file systems known to have
 605          * problems with large blocks */
 606         if (nfserr == 0) {
 607                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 608
 609                 /* Note that we don't care for remote fs's here */
 610                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 611                         resp->f_properties = NFS3_FSF_BILLYBOY;
 612                 }
 613                 resp->f_maxfilesize = sb->s_maxbytes;
 614         }
 615
 616         fh_put(&argp->fh);
 617         RETURN_STATUS(nfserr);
 618 }
 619
 620 /*
 621  * Get pathconf info for the specified file
 622  */
 623 static __be32
 624 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 625 {
 626         struct nfsd_fhandle *argp = rqstp->rq_argp;
 627         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 628         __be32  nfserr;
 629
 630         dprintk("nfsd: PATHCONF(3) %s\n",
 631                                 SVCFH_fmt(&argp->fh));
 632
 633         /* Set default pathconf */
 634         resp->p_link_max = 255;         /* at least */
 635         resp->p_name_max = 255;         /* at least */
 636         resp->p_no_trunc = 0;
 637         resp->p_chown_restricted = 1;
 638         resp->p_case_insensitive = 0;
 639         resp->p_case_preserving = 1;
 640
 641         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 642
 643         if (nfserr == 0) {
 644                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 645
 646                 /* Note that we don't care for remote fs's here */
 647                 switch (sb->s_magic) {
 648                 case EXT2_SUPER_MAGIC:
 649                         resp->p_link_max = EXT2_LINK_MAX;
 650                         resp->p_name_max = EXT2_NAME_LEN;
 651                         break;
 652                 case MSDOS_SUPER_MAGIC:
 653                         resp->p_case_insensitive = 1;
 654                         resp->p_case_preserving  = 0;
 655                         break;
 656                 }
 657         }
 658
 659         fh_put(&argp->fh);
 660         RETURN_STATUS(nfserr);
 661 }
 662
 663
 664 /*
 665  * Commit a file (range) to stable storage.
 666  */
 667 static __be32
 668 nfsd3_proc_commit(struct svc_rqst *rqstp)
 669 {
 670         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 671         struct nfsd3_commitres *resp = rqstp->rq_resp;
 672         __be32  nfserr;
 673
 674         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 675                                 SVCFH_fmt(&argp->fh),
 676                                 argp->count,
 677                                 (unsigned long long) argp->offset);
 678
 679         if (argp->offset > NFS_OFFSET_MAX)
 680                 RETURN_STATUS(nfserr_inval);
 681
 682         fh_copy(&resp->fh, &argp->fh);
 683         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 684
 685         RETURN_STATUS(nfserr);
 686 }
 687
 688
 689 /*
 690  * NFSv3 Server procedures.
 691  * Only the results of non-idempotent operations are cached.
 692  */
 693 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 694 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 695 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 696 #define nfsd3_mkdirargs                 nfsd3_createargs
 697 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 698 #define nfsd3_fhandleargs               nfsd_fhandle
 699 #define nfsd3_fhandleres                nfsd3_attrstat
 700 #define nfsd3_attrstatres               nfsd3_attrstat
 701 #define nfsd3_wccstatres                nfsd3_attrstat
 702 #define nfsd3_createres                 nfsd3_diropres
 703 #define nfsd3_voidres                   nfsd3_voidargs
 704 struct nfsd3_voidargs { int dummy; };
 705
 706 #define ST 1            /* status*/
 707 #define FH 17           /* filehandle with length */
 708 #define AT 21           /* attributes */
 709 #define pAT (1+AT)      /* post attributes - conditional */
 710 #define WC (7+pAT)      /* WCC attributes */
 711
 712 static const struct svc_procedure nfsd_procedures3[22] = {
 713         [NFS3PROC_NULL] = {
 714                 .pc_func = nfsd3_proc_null,
 715                 .pc_encode = nfs3svc_encode_voidres,
 716                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 717                 .pc_ressize = sizeof(struct nfsd3_voidres),
 718                 .pc_cachetype = RC_NOCACHE,
 719                 .pc_xdrressize = ST,
 720         },
 721         [NFS3PROC_GETATTR] = {
 722                 .pc_func = nfsd3_proc_getattr,
 723                 .pc_decode = nfs3svc_decode_fhandleargs,
 724                 .pc_encode = nfs3svc_encode_attrstatres,
 725                 .pc_release = nfs3svc_release_fhandle,
 726                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 727                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 728                 .pc_cachetype = RC_NOCACHE,
 729                 .pc_xdrressize = ST+AT,
 730         },
 731         [NFS3PROC_SETATTR] = {
 732                 .pc_func = nfsd3_proc_setattr,
 733                 .pc_decode = nfs3svc_decode_sattrargs,
 734                 .pc_encode = nfs3svc_encode_wccstatres,
 735                 .pc_release = nfs3svc_release_fhandle,
 736                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 737                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 738                 .pc_cachetype = RC_REPLBUFF,
 739                 .pc_xdrressize = ST+WC,
 740         },
 741         [NFS3PROC_LOOKUP] = {
 742                 .pc_func = nfsd3_proc_lookup,
 743                 .pc_decode = nfs3svc_decode_diropargs,
 744                 .pc_encode = nfs3svc_encode_diropres,
 745                 .pc_release = nfs3svc_release_fhandle2,
 746                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 747                 .pc_ressize = sizeof(struct nfsd3_diropres),
 748                 .pc_cachetype = RC_NOCACHE,
 749                 .pc_xdrressize = ST+FH+pAT+pAT,
 750         },
 751         [NFS3PROC_ACCESS] = {
 752                 .pc_func = nfsd3_proc_access,
 753                 .pc_decode = nfs3svc_decode_accessargs,
 754                 .pc_encode = nfs3svc_encode_accessres,
 755                 .pc_release = nfs3svc_release_fhandle,
 756                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 757                 .pc_ressize = sizeof(struct nfsd3_accessres),
 758                 .pc_cachetype = RC_NOCACHE,
 759                 .pc_xdrressize = ST+pAT+1,
 760         },
 761         [NFS3PROC_READLINK] = {
 762                 .pc_func = nfsd3_proc_readlink,
 763                 .pc_decode = nfs3svc_decode_readlinkargs,
 764                 .pc_encode = nfs3svc_encode_readlinkres,
 765                 .pc_release = nfs3svc_release_fhandle,
 766                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 767                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 768                 .pc_cachetype = RC_NOCACHE,
 769                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 770         },
 771         [NFS3PROC_READ] = {
 772                 .pc_func = nfsd3_proc_read,
 773                 .pc_decode = nfs3svc_decode_readargs,
 774                 .pc_encode = nfs3svc_encode_readres,
 775                 .pc_release = nfs3svc_release_fhandle,
 776                 .pc_argsize = sizeof(struct nfsd3_readargs),
 777                 .pc_ressize = sizeof(struct nfsd3_readres),
 778                 .pc_cachetype = RC_NOCACHE,
 779                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 780         },
 781         [NFS3PROC_WRITE] = {
 782                 .pc_func = nfsd3_proc_write,
 783                 .pc_decode = nfs3svc_decode_writeargs,
 784                 .pc_encode = nfs3svc_encode_writeres,
 785                 .pc_release = nfs3svc_release_fhandle,
 786                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 787                 .pc_ressize = sizeof(struct nfsd3_writeres),
 788                 .pc_cachetype = RC_REPLBUFF,
 789                 .pc_xdrressize = ST+WC+4,
 790         },
 791         [NFS3PROC_CREATE] = {
 792                 .pc_func = nfsd3_proc_create,
 793                 .pc_decode = nfs3svc_decode_createargs,
 794                 .pc_encode = nfs3svc_encode_createres,
 795                 .pc_release = nfs3svc_release_fhandle2,
 796                 .pc_argsize = sizeof(struct nfsd3_createargs),
 797                 .pc_ressize = sizeof(struct nfsd3_createres),
 798                 .pc_cachetype = RC_REPLBUFF,
 799                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 800         },
 801         [NFS3PROC_MKDIR] = {
 802                 .pc_func = nfsd3_proc_mkdir,
 803                 .pc_decode = nfs3svc_decode_mkdirargs,
 804                 .pc_encode = nfs3svc_encode_createres,
 805                 .pc_release = nfs3svc_release_fhandle2,
 806                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 807                 .pc_ressize = sizeof(struct nfsd3_createres),
 808                 .pc_cachetype = RC_REPLBUFF,
 809                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 810         },
 811         [NFS3PROC_SYMLINK] = {
 812                 .pc_func = nfsd3_proc_symlink,
 813                 .pc_decode = nfs3svc_decode_symlinkargs,
 814                 .pc_encode = nfs3svc_encode_createres,
 815                 .pc_release = nfs3svc_release_fhandle2,
 816                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 817                 .pc_ressize = sizeof(struct nfsd3_createres),
 818                 .pc_cachetype = RC_REPLBUFF,
 819                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 820         },
 821         [NFS3PROC_MKNOD] = {
 822                 .pc_func = nfsd3_proc_mknod,
 823                 .pc_decode = nfs3svc_decode_mknodargs,
 824                 .pc_encode = nfs3svc_encode_createres,
 825                 .pc_release = nfs3svc_release_fhandle2,
 826                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 827                 .pc_ressize = sizeof(struct nfsd3_createres),
 828                 .pc_cachetype = RC_REPLBUFF,
 829                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 830         },
 831         [NFS3PROC_REMOVE] = {
 832                 .pc_func = nfsd3_proc_remove,
 833                 .pc_decode = nfs3svc_decode_diropargs,
 834                 .pc_encode = nfs3svc_encode_wccstatres,
 835                 .pc_release = nfs3svc_release_fhandle,
 836                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 837                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 838                 .pc_cachetype = RC_REPLBUFF,
 839                 .pc_xdrressize = ST+WC,
 840         },
 841         [NFS3PROC_RMDIR] = {
 842                 .pc_func = nfsd3_proc_rmdir,
 843                 .pc_decode = nfs3svc_decode_diropargs,
 844                 .pc_encode = nfs3svc_encode_wccstatres,
 845                 .pc_release = nfs3svc_release_fhandle,
 846                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 847                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 848                 .pc_cachetype = RC_REPLBUFF,
 849                 .pc_xdrressize = ST+WC,
 850         },
 851         [NFS3PROC_RENAME] = {
 852                 .pc_func = nfsd3_proc_rename,
 853                 .pc_decode = nfs3svc_decode_renameargs,
 854                 .pc_encode = nfs3svc_encode_renameres,
 855                 .pc_release = nfs3svc_release_fhandle2,
 856                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 857                 .pc_ressize = sizeof(struct nfsd3_renameres),
 858                 .pc_cachetype = RC_REPLBUFF,
 859                 .pc_xdrressize = ST+WC+WC,
 860         },
 861         [NFS3PROC_LINK] = {
 862                 .pc_func = nfsd3_proc_link,
 863                 .pc_decode = nfs3svc_decode_linkargs,
 864                 .pc_encode = nfs3svc_encode_linkres,
 865                 .pc_release = nfs3svc_release_fhandle2,
 866                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 867                 .pc_ressize = sizeof(struct nfsd3_linkres),
 868                 .pc_cachetype = RC_REPLBUFF,
 869                 .pc_xdrressize = ST+pAT+WC,
 870         },
 871         [NFS3PROC_READDIR] = {
 872                 .pc_func = nfsd3_proc_readdir,
 873                 .pc_decode = nfs3svc_decode_readdirargs,
 874                 .pc_encode = nfs3svc_encode_readdirres,
 875                 .pc_release = nfs3svc_release_fhandle,
 876                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 877                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 878                 .pc_cachetype = RC_NOCACHE,
 879         },
 880         [NFS3PROC_READDIRPLUS] = {
 881                 .pc_func = nfsd3_proc_readdirplus,
 882                 .pc_decode = nfs3svc_decode_readdirplusargs,
 883                 .pc_encode = nfs3svc_encode_readdirres,
 884                 .pc_release = nfs3svc_release_fhandle,
 885                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 886                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 887                 .pc_cachetype = RC_NOCACHE,
 888         },
 889         [NFS3PROC_FSSTAT] = {
 890                 .pc_func = nfsd3_proc_fsstat,
 891                 .pc_decode = nfs3svc_decode_fhandleargs,
 892                 .pc_encode = nfs3svc_encode_fsstatres,
 893                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 894                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 895                 .pc_cachetype = RC_NOCACHE,
 896                 .pc_xdrressize = ST+pAT+2*6+1,
 897         },
 898         [NFS3PROC_FSINFO] = {
 899                 .pc_func = nfsd3_proc_fsinfo,
 900                 .pc_decode = nfs3svc_decode_fhandleargs,
 901                 .pc_encode = nfs3svc_encode_fsinfores,
 902                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 903                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 904                 .pc_cachetype = RC_NOCACHE,
 905                 .pc_xdrressize = ST+pAT+12,
 906         },
 907         [NFS3PROC_PATHCONF] = {
 908                 .pc_func = nfsd3_proc_pathconf,
 909                 .pc_decode = nfs3svc_decode_fhandleargs,
 910                 .pc_encode = nfs3svc_encode_pathconfres,
 911                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 912                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 913                 .pc_cachetype = RC_NOCACHE,
 914                 .pc_xdrressize = ST+pAT+6,
 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         },
 926 };
 927
 928 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 929 const struct svc_version nfsd_version3 = {
 930         .vs_vers        = 3,
 931         .vs_nproc       = 22,
 932         .vs_proc        = nfsd_procedures3,
 933         .vs_dispatch    = nfsd_dispatch,
 934         .vs_count       = nfsd_count3,
 935         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 936 };