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         fh_copy(&resp->fh, &argp->fh);
 204         resp->committed = argp->stable;
 205         nvecs = svc_fill_write_vector(rqstp, &argp->first, cnt);
 206         if (!nvecs)
 207                 RETURN_STATUS(nfserr_io);
 208         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 209                             rqstp->rq_vec, nvecs, &cnt,
 210                             resp->committed);
 211         resp->count = cnt;
 212         RETURN_STATUS(nfserr);
 213 }
 214
 215 /*
 216  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 217  * At least in theory; we'll see how it fares in practice when the
 218  * first reports about SunOS compatibility problems start to pour in...
 219  */
 220 static __be32
 221 nfsd3_proc_create(struct svc_rqst *rqstp)
 222 {
 223         struct nfsd3_createargs *argp = rqstp->rq_argp;
 224         struct nfsd3_diropres *resp = rqstp->rq_resp;
 225         svc_fh          *dirfhp, *newfhp = NULL;
 226         struct iattr    *attr;
 227         __be32          nfserr;
 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         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 249                                 attr, newfhp,
 250                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
 251
 252         RETURN_STATUS(nfserr);
 253 }
 254
 255 /*
 256  * Make directory. This operation is not idempotent.
 257  */
 258 static __be32
 259 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 260 {
 261         struct nfsd3_createargs *argp = rqstp->rq_argp;
 262         struct nfsd3_diropres *resp = rqstp->rq_resp;
 263         __be32  nfserr;
 264
 265         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 266                                 SVCFH_fmt(&argp->fh),
 267                                 argp->len,
 268                                 argp->name);
 269
 270         argp->attrs.ia_valid &= ~ATTR_SIZE;
 271         fh_copy(&resp->dirfh, &argp->fh);
 272         fh_init(&resp->fh, NFS3_FHSIZE);
 273         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 274                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 275         fh_unlock(&resp->dirfh);
 276         RETURN_STATUS(nfserr);
 277 }
 278
 279 static __be32
 280 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 281 {
 282         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 283         struct nfsd3_diropres *resp = rqstp->rq_resp;
 284         __be32  nfserr;
 285
 286         if (argp->tlen == 0)
 287                 RETURN_STATUS(nfserr_inval);
 288         if (argp->tlen > NFS3_MAXPATHLEN)
 289                 RETURN_STATUS(nfserr_nametoolong);
 290
 291         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 292                                                 argp->tlen);
 293         if (IS_ERR(argp->tname))
 294                 RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
 295
 296         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 297                                 SVCFH_fmt(&argp->ffh),
 298                                 argp->flen, argp->fname,
 299                                 argp->tlen, argp->tname);
 300
 301         fh_copy(&resp->dirfh, &argp->ffh);
 302         fh_init(&resp->fh, NFS3_FHSIZE);
 303         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 304                                                    argp->tname, &resp->fh);
 305         RETURN_STATUS(nfserr);
 306 }
 307
 308 /*
 309  * Make socket/fifo/device.
 310  */
 311 static __be32
 312 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 313 {
 314         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 315         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 316         __be32  nfserr;
 317         int type;
 318         dev_t   rdev = 0;
 319
 320         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 321                                 SVCFH_fmt(&argp->fh),
 322                                 argp->len,
 323                                 argp->name);
 324
 325         fh_copy(&resp->dirfh, &argp->fh);
 326         fh_init(&resp->fh, NFS3_FHSIZE);
 327
 328         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 329                 RETURN_STATUS(nfserr_inval);
 330         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 331                 rdev = MKDEV(argp->major, argp->minor);
 332                 if (MAJOR(rdev) != argp->major ||
 333                     MINOR(rdev) != argp->minor)
 334                         RETURN_STATUS(nfserr_inval);
 335         } else
 336                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 337                         RETURN_STATUS(nfserr_inval);
 338
 339         type = nfs3_ftypes[argp->ftype];
 340         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 341                                     &argp->attrs, type, rdev, &resp->fh);
 342         fh_unlock(&resp->dirfh);
 343         RETURN_STATUS(nfserr);
 344 }
 345
 346 /*
 347  * Remove file/fifo/socket etc.
 348  */
 349 static __be32
 350 nfsd3_proc_remove(struct svc_rqst *rqstp)
 351 {
 352         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 353         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 354         __be32  nfserr;
 355
 356         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 357                                 SVCFH_fmt(&argp->fh),
 358                                 argp->len,
 359                                 argp->name);
 360
 361         /* Unlink. -S_IFDIR means file must not be a directory */
 362         fh_copy(&resp->fh, &argp->fh);
 363         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 364         fh_unlock(&resp->fh);
 365         RETURN_STATUS(nfserr);
 366 }
 367
 368 /*
 369  * Remove a directory
 370  */
 371 static __be32
 372 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 373 {
 374         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 375         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 376         __be32  nfserr;
 377
 378         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 379                                 SVCFH_fmt(&argp->fh),
 380                                 argp->len,
 381                                 argp->name);
 382
 383         fh_copy(&resp->fh, &argp->fh);
 384         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 385         fh_unlock(&resp->fh);
 386         RETURN_STATUS(nfserr);
 387 }
 388
 389 static __be32
 390 nfsd3_proc_rename(struct svc_rqst *rqstp)
 391 {
 392         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 393         struct nfsd3_renameres *resp = rqstp->rq_resp;
 394         __be32  nfserr;
 395
 396         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 397                                 SVCFH_fmt(&argp->ffh),
 398                                 argp->flen,
 399                                 argp->fname);
 400         dprintk("nfsd: -> %s %.*s\n",
 401                                 SVCFH_fmt(&argp->tfh),
 402                                 argp->tlen,
 403                                 argp->tname);
 404
 405         fh_copy(&resp->ffh, &argp->ffh);
 406         fh_copy(&resp->tfh, &argp->tfh);
 407         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 408                                     &resp->tfh, argp->tname, argp->tlen);
 409         RETURN_STATUS(nfserr);
 410 }
 411
 412 static __be32
 413 nfsd3_proc_link(struct svc_rqst *rqstp)
 414 {
 415         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 416         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 417         __be32  nfserr;
 418
 419         dprintk("nfsd: LINK(3)     %s ->\n",
 420                                 SVCFH_fmt(&argp->ffh));
 421         dprintk("nfsd:   -> %s %.*s\n",
 422                                 SVCFH_fmt(&argp->tfh),
 423                                 argp->tlen,
 424                                 argp->tname);
 425
 426         fh_copy(&resp->fh,  &argp->ffh);
 427         fh_copy(&resp->tfh, &argp->tfh);
 428         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 429                                   &resp->fh);
 430         RETURN_STATUS(nfserr);
 431 }
 432
 433 /*
 434  * Read a portion of a directory.
 435  */
 436 static __be32
 437 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 438 {
 439         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 440         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 441         __be32          nfserr;
 442         int             count;
 443
 444         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 445                                 SVCFH_fmt(&argp->fh),
 446                                 argp->count, (u32) argp->cookie);
 447
 448         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 449          * client read size */
 450         count = (argp->count >> 2) - 2;
 451
 452         /* Read directory and encode entries on the fly */
 453         fh_copy(&resp->fh, &argp->fh);
 454
 455         resp->buflen = count;
 456         resp->common.err = nfs_ok;
 457         resp->buffer = argp->buffer;
 458         resp->rqstp = rqstp;
 459         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
 460                                         &resp->common, nfs3svc_encode_entry);
 461         memcpy(resp->verf, argp->verf, 8);
 462         resp->count = resp->buffer - argp->buffer;
 463         if (resp->offset)
 464                 xdr_encode_hyper(resp->offset, argp->cookie);
 465
 466         RETURN_STATUS(nfserr);
 467 }
 468
 469 /*
 470  * Read a portion of a directory, including file handles and attrs.
 471  * For now, we choose to ignore the dircount parameter.
 472  */
 473 static __be32
 474 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 475 {
 476         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 477         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 478         __be32  nfserr;
 479         int     count = 0;
 480         loff_t  offset;
 481         struct page **p;
 482         caddr_t page_addr = NULL;
 483
 484         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 485                                 SVCFH_fmt(&argp->fh),
 486                                 argp->count, (u32) argp->cookie);
 487
 488         /* Convert byte count to number of words (i.e. >> 2),
 489          * and reserve room for the NULL ptr & eof flag (-2 words) */
 490         resp->count = (argp->count >> 2) - 2;
 491
 492         /* Read directory and encode entries on the fly */
 493         fh_copy(&resp->fh, &argp->fh);
 494
 495         resp->common.err = nfs_ok;
 496         resp->buffer = argp->buffer;
 497         resp->buflen = resp->count;
 498         resp->rqstp = rqstp;
 499         offset = argp->cookie;
 500
 501         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 502         if (nfserr)
 503                 RETURN_STATUS(nfserr);
 504
 505         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 506                 RETURN_STATUS(nfserr_notsupp);
 507
 508         nfserr = nfsd_readdir(rqstp, &resp->fh,
 509                                      &offset,
 510                                      &resp->common,
 511                                      nfs3svc_encode_entry_plus);
 512         memcpy(resp->verf, argp->verf, 8);
 513         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 514                 page_addr = page_address(*p);
 515
 516                 if (((caddr_t)resp->buffer >= page_addr) &&
 517                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 518                         count += (caddr_t)resp->buffer - page_addr;
 519                         break;
 520                 }
 521                 count += PAGE_SIZE;
 522         }
 523         resp->count = count >> 2;
 524         if (resp->offset) {
 525                 if (unlikely(resp->offset1)) {
 526                         /* we ended up with offset on a page boundary */
 527                         *resp->offset = htonl(offset >> 32);
 528                         *resp->offset1 = htonl(offset & 0xffffffff);
 529                         resp->offset1 = NULL;
 530                 } else {
 531                         xdr_encode_hyper(resp->offset, offset);
 532                 }
 533         }
 534
 535         RETURN_STATUS(nfserr);
 536 }
 537
 538 /*
 539  * Get file system stats
 540  */
 541 static __be32
 542 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 543 {
 544         struct nfsd_fhandle *argp = rqstp->rq_argp;
 545         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 546         __be32  nfserr;
 547
 548         dprintk("nfsd: FSSTAT(3)   %s\n",
 549                                 SVCFH_fmt(&argp->fh));
 550
 551         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 552         fh_put(&argp->fh);
 553         RETURN_STATUS(nfserr);
 554 }
 555
 556 /*
 557  * Get file system info
 558  */
 559 static __be32
 560 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 561 {
 562         struct nfsd_fhandle *argp = rqstp->rq_argp;
 563         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 564         __be32  nfserr;
 565         u32     max_blocksize = svc_max_payload(rqstp);
 566
 567         dprintk("nfsd: FSINFO(3)   %s\n",
 568                                 SVCFH_fmt(&argp->fh));
 569
 570         resp->f_rtmax  = max_blocksize;
 571         resp->f_rtpref = max_blocksize;
 572         resp->f_rtmult = PAGE_SIZE;
 573         resp->f_wtmax  = max_blocksize;
 574         resp->f_wtpref = max_blocksize;
 575         resp->f_wtmult = PAGE_SIZE;
 576         resp->f_dtpref = PAGE_SIZE;
 577         resp->f_maxfilesize = ~(u32) 0;
 578         resp->f_properties = NFS3_FSF_DEFAULT;
 579
 580         nfserr = fh_verify(rqstp, &argp->fh, 0,
 581                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 582
 583         /* Check special features of the file system. May request
 584          * different read/write sizes for file systems known to have
 585          * problems with large blocks */
 586         if (nfserr == 0) {
 587                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 588
 589                 /* Note that we don't care for remote fs's here */
 590                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 591                         resp->f_properties = NFS3_FSF_BILLYBOY;
 592                 }
 593                 resp->f_maxfilesize = sb->s_maxbytes;
 594         }
 595
 596         fh_put(&argp->fh);
 597         RETURN_STATUS(nfserr);
 598 }
 599
 600 /*
 601  * Get pathconf info for the specified file
 602  */
 603 static __be32
 604 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 605 {
 606         struct nfsd_fhandle *argp = rqstp->rq_argp;
 607         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 608         __be32  nfserr;
 609
 610         dprintk("nfsd: PATHCONF(3) %s\n",
 611                                 SVCFH_fmt(&argp->fh));
 612
 613         /* Set default pathconf */
 614         resp->p_link_max = 255;         /* at least */
 615         resp->p_name_max = 255;         /* at least */
 616         resp->p_no_trunc = 0;
 617         resp->p_chown_restricted = 1;
 618         resp->p_case_insensitive = 0;
 619         resp->p_case_preserving = 1;
 620
 621         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 622
 623         if (nfserr == 0) {
 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                 switch (sb->s_magic) {
 628                 case EXT2_SUPER_MAGIC:
 629                         resp->p_link_max = EXT2_LINK_MAX;
 630                         resp->p_name_max = EXT2_NAME_LEN;
 631                         break;
 632                 case MSDOS_SUPER_MAGIC:
 633                         resp->p_case_insensitive = 1;
 634                         resp->p_case_preserving  = 0;
 635                         break;
 636                 }
 637         }
 638
 639         fh_put(&argp->fh);
 640         RETURN_STATUS(nfserr);
 641 }
 642
 643
 644 /*
 645  * Commit a file (range) to stable storage.
 646  */
 647 static __be32
 648 nfsd3_proc_commit(struct svc_rqst *rqstp)
 649 {
 650         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 651         struct nfsd3_commitres *resp = rqstp->rq_resp;
 652         __be32  nfserr;
 653
 654         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 655                                 SVCFH_fmt(&argp->fh),
 656                                 argp->count,
 657                                 (unsigned long long) argp->offset);
 658
 659         if (argp->offset > NFS_OFFSET_MAX)
 660                 RETURN_STATUS(nfserr_inval);
 661
 662         fh_copy(&resp->fh, &argp->fh);
 663         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 664
 665         RETURN_STATUS(nfserr);
 666 }
 667
 668
 669 /*
 670  * NFSv3 Server procedures.
 671  * Only the results of non-idempotent operations are cached.
 672  */
 673 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 674 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 675 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 676 #define nfsd3_mkdirargs                 nfsd3_createargs
 677 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 678 #define nfsd3_fhandleargs               nfsd_fhandle
 679 #define nfsd3_fhandleres                nfsd3_attrstat
 680 #define nfsd3_attrstatres               nfsd3_attrstat
 681 #define nfsd3_wccstatres                nfsd3_attrstat
 682 #define nfsd3_createres                 nfsd3_diropres
 683 #define nfsd3_voidres                   nfsd3_voidargs
 684 struct nfsd3_voidargs { int dummy; };
 685
 686 #define ST 1            /* status*/
 687 #define FH 17           /* filehandle with length */
 688 #define AT 21           /* attributes */
 689 #define pAT (1+AT)      /* post attributes - conditional */
 690 #define WC (7+pAT)      /* WCC attributes */
 691
 692 static const struct svc_procedure nfsd_procedures3[22] = {
 693         [NFS3PROC_NULL] = {
 694                 .pc_func = nfsd3_proc_null,
 695                 .pc_encode = nfs3svc_encode_voidres,
 696                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 697                 .pc_ressize = sizeof(struct nfsd3_voidres),
 698                 .pc_cachetype = RC_NOCACHE,
 699                 .pc_xdrressize = ST,
 700         },
 701         [NFS3PROC_GETATTR] = {
 702                 .pc_func = nfsd3_proc_getattr,
 703                 .pc_decode = nfs3svc_decode_fhandleargs,
 704                 .pc_encode = nfs3svc_encode_attrstatres,
 705                 .pc_release = nfs3svc_release_fhandle,
 706                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 707                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 708                 .pc_cachetype = RC_NOCACHE,
 709                 .pc_xdrressize = ST+AT,
 710         },
 711         [NFS3PROC_SETATTR] = {
 712                 .pc_func = nfsd3_proc_setattr,
 713                 .pc_decode = nfs3svc_decode_sattrargs,
 714                 .pc_encode = nfs3svc_encode_wccstatres,
 715                 .pc_release = nfs3svc_release_fhandle,
 716                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 717                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 718                 .pc_cachetype = RC_REPLBUFF,
 719                 .pc_xdrressize = ST+WC,
 720         },
 721         [NFS3PROC_LOOKUP] = {
 722                 .pc_func = nfsd3_proc_lookup,
 723                 .pc_decode = nfs3svc_decode_diropargs,
 724                 .pc_encode = nfs3svc_encode_diropres,
 725                 .pc_release = nfs3svc_release_fhandle2,
 726                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 727                 .pc_ressize = sizeof(struct nfsd3_diropres),
 728                 .pc_cachetype = RC_NOCACHE,
 729                 .pc_xdrressize = ST+FH+pAT+pAT,
 730         },
 731         [NFS3PROC_ACCESS] = {
 732                 .pc_func = nfsd3_proc_access,
 733                 .pc_decode = nfs3svc_decode_accessargs,
 734                 .pc_encode = nfs3svc_encode_accessres,
 735                 .pc_release = nfs3svc_release_fhandle,
 736                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 737                 .pc_ressize = sizeof(struct nfsd3_accessres),
 738                 .pc_cachetype = RC_NOCACHE,
 739                 .pc_xdrressize = ST+pAT+1,
 740         },
 741         [NFS3PROC_READLINK] = {
 742                 .pc_func = nfsd3_proc_readlink,
 743                 .pc_decode = nfs3svc_decode_readlinkargs,
 744                 .pc_encode = nfs3svc_encode_readlinkres,
 745                 .pc_release = nfs3svc_release_fhandle,
 746                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 747                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 748                 .pc_cachetype = RC_NOCACHE,
 749                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 750         },
 751         [NFS3PROC_READ] = {
 752                 .pc_func = nfsd3_proc_read,
 753                 .pc_decode = nfs3svc_decode_readargs,
 754                 .pc_encode = nfs3svc_encode_readres,
 755                 .pc_release = nfs3svc_release_fhandle,
 756                 .pc_argsize = sizeof(struct nfsd3_readargs),
 757                 .pc_ressize = sizeof(struct nfsd3_readres),
 758                 .pc_cachetype = RC_NOCACHE,
 759                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 760         },
 761         [NFS3PROC_WRITE] = {
 762                 .pc_func = nfsd3_proc_write,
 763                 .pc_decode = nfs3svc_decode_writeargs,
 764                 .pc_encode = nfs3svc_encode_writeres,
 765                 .pc_release = nfs3svc_release_fhandle,
 766                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 767                 .pc_ressize = sizeof(struct nfsd3_writeres),
 768                 .pc_cachetype = RC_REPLBUFF,
 769                 .pc_xdrressize = ST+WC+4,
 770         },
 771         [NFS3PROC_CREATE] = {
 772                 .pc_func = nfsd3_proc_create,
 773                 .pc_decode = nfs3svc_decode_createargs,
 774                 .pc_encode = nfs3svc_encode_createres,
 775                 .pc_release = nfs3svc_release_fhandle2,
 776                 .pc_argsize = sizeof(struct nfsd3_createargs),
 777                 .pc_ressize = sizeof(struct nfsd3_createres),
 778                 .pc_cachetype = RC_REPLBUFF,
 779                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 780         },
 781         [NFS3PROC_MKDIR] = {
 782                 .pc_func = nfsd3_proc_mkdir,
 783                 .pc_decode = nfs3svc_decode_mkdirargs,
 784                 .pc_encode = nfs3svc_encode_createres,
 785                 .pc_release = nfs3svc_release_fhandle2,
 786                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 787                 .pc_ressize = sizeof(struct nfsd3_createres),
 788                 .pc_cachetype = RC_REPLBUFF,
 789                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 790         },
 791         [NFS3PROC_SYMLINK] = {
 792                 .pc_func = nfsd3_proc_symlink,
 793                 .pc_decode = nfs3svc_decode_symlinkargs,
 794                 .pc_encode = nfs3svc_encode_createres,
 795                 .pc_release = nfs3svc_release_fhandle2,
 796                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 797                 .pc_ressize = sizeof(struct nfsd3_createres),
 798                 .pc_cachetype = RC_REPLBUFF,
 799                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 800         },
 801         [NFS3PROC_MKNOD] = {
 802                 .pc_func = nfsd3_proc_mknod,
 803                 .pc_decode = nfs3svc_decode_mknodargs,
 804                 .pc_encode = nfs3svc_encode_createres,
 805                 .pc_release = nfs3svc_release_fhandle2,
 806                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 807                 .pc_ressize = sizeof(struct nfsd3_createres),
 808                 .pc_cachetype = RC_REPLBUFF,
 809                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 810         },
 811         [NFS3PROC_REMOVE] = {
 812                 .pc_func = nfsd3_proc_remove,
 813                 .pc_decode = nfs3svc_decode_diropargs,
 814                 .pc_encode = nfs3svc_encode_wccstatres,
 815                 .pc_release = nfs3svc_release_fhandle,
 816                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 817                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 818                 .pc_cachetype = RC_REPLBUFF,
 819                 .pc_xdrressize = ST+WC,
 820         },
 821         [NFS3PROC_RMDIR] = {
 822                 .pc_func = nfsd3_proc_rmdir,
 823                 .pc_decode = nfs3svc_decode_diropargs,
 824                 .pc_encode = nfs3svc_encode_wccstatres,
 825                 .pc_release = nfs3svc_release_fhandle,
 826                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 827                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 828                 .pc_cachetype = RC_REPLBUFF,
 829                 .pc_xdrressize = ST+WC,
 830         },
 831         [NFS3PROC_RENAME] = {
 832                 .pc_func = nfsd3_proc_rename,
 833                 .pc_decode = nfs3svc_decode_renameargs,
 834                 .pc_encode = nfs3svc_encode_renameres,
 835                 .pc_release = nfs3svc_release_fhandle2,
 836                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 837                 .pc_ressize = sizeof(struct nfsd3_renameres),
 838                 .pc_cachetype = RC_REPLBUFF,
 839                 .pc_xdrressize = ST+WC+WC,
 840         },
 841         [NFS3PROC_LINK] = {
 842                 .pc_func = nfsd3_proc_link,
 843                 .pc_decode = nfs3svc_decode_linkargs,
 844                 .pc_encode = nfs3svc_encode_linkres,
 845                 .pc_release = nfs3svc_release_fhandle2,
 846                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 847                 .pc_ressize = sizeof(struct nfsd3_linkres),
 848                 .pc_cachetype = RC_REPLBUFF,
 849                 .pc_xdrressize = ST+pAT+WC,
 850         },
 851         [NFS3PROC_READDIR] = {
 852                 .pc_func = nfsd3_proc_readdir,
 853                 .pc_decode = nfs3svc_decode_readdirargs,
 854                 .pc_encode = nfs3svc_encode_readdirres,
 855                 .pc_release = nfs3svc_release_fhandle,
 856                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 857                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 858                 .pc_cachetype = RC_NOCACHE,
 859         },
 860         [NFS3PROC_READDIRPLUS] = {
 861                 .pc_func = nfsd3_proc_readdirplus,
 862                 .pc_decode = nfs3svc_decode_readdirplusargs,
 863                 .pc_encode = nfs3svc_encode_readdirres,
 864                 .pc_release = nfs3svc_release_fhandle,
 865                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 866                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 867                 .pc_cachetype = RC_NOCACHE,
 868         },
 869         [NFS3PROC_FSSTAT] = {
 870                 .pc_func = nfsd3_proc_fsstat,
 871                 .pc_decode = nfs3svc_decode_fhandleargs,
 872                 .pc_encode = nfs3svc_encode_fsstatres,
 873                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 874                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 875                 .pc_cachetype = RC_NOCACHE,
 876                 .pc_xdrressize = ST+pAT+2*6+1,
 877         },
 878         [NFS3PROC_FSINFO] = {
 879                 .pc_func = nfsd3_proc_fsinfo,
 880                 .pc_decode = nfs3svc_decode_fhandleargs,
 881                 .pc_encode = nfs3svc_encode_fsinfores,
 882                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 883                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 884                 .pc_cachetype = RC_NOCACHE,
 885                 .pc_xdrressize = ST+pAT+12,
 886         },
 887         [NFS3PROC_PATHCONF] = {
 888                 .pc_func = nfsd3_proc_pathconf,
 889                 .pc_decode = nfs3svc_decode_fhandleargs,
 890                 .pc_encode = nfs3svc_encode_pathconfres,
 891                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 892                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 893                 .pc_cachetype = RC_NOCACHE,
 894                 .pc_xdrressize = ST+pAT+6,
 895         },
 896         [NFS3PROC_COMMIT] = {
 897                 .pc_func = nfsd3_proc_commit,
 898                 .pc_decode = nfs3svc_decode_commitargs,
 899                 .pc_encode = nfs3svc_encode_commitres,
 900                 .pc_release = nfs3svc_release_fhandle,
 901                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 902                 .pc_ressize = sizeof(struct nfsd3_commitres),
 903                 .pc_cachetype = RC_NOCACHE,
 904                 .pc_xdrressize = ST+WC+2,
 905         },
 906 };
 907
 908 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 909 const struct svc_version nfsd_version3 = {
 910         .vs_vers        = 3,
 911         .vs_nproc       = 22,
 912         .vs_proc        = nfsd_procedures3,
 913         .vs_dispatch    = nfsd_dispatch,
 914         .vs_count       = nfsd_count3,
 915         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 916 };