fs/nfsd/nfs3proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Process version 3 NFS requests.
   4  *
   5  * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #include <linux/fs.h>
   9 #include <linux/ext2_fs.h>
  10 #include <linux/magic.h>
  11
  12 #include "cache.h"
  13 #include "xdr3.h"
  14 #include "vfs.h"
  15
  16 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  17
  18 static int      nfs3_ftypes[] = {
  19         0,                      /* NF3NON */
  20         S_IFREG,                /* NF3REG */
  21         S_IFDIR,                /* NF3DIR */
  22         S_IFBLK,                /* NF3BLK */
  23         S_IFCHR,                /* NF3CHR */
  24         S_IFLNK,                /* NF3LNK */
  25         S_IFSOCK,               /* NF3SOCK */
  26         S_IFIFO,                /* NF3FIFO */
  27 };
  28
  29 /*
  30  * NULL call.
  31  */
  32 static __be32
  33 nfsd3_proc_null(struct svc_rqst *rqstp)
  34 {
  35         return rpc_success;
  36 }
  37
  38 /*
  39  * Get a file's attributes
  40  */
  41 static __be32
  42 nfsd3_proc_getattr(struct svc_rqst *rqstp)
  43 {
  44         struct nfsd_fhandle *argp = rqstp->rq_argp;
  45         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  46
  47         dprintk("nfsd: GETATTR(3)  %s\n",
  48                 SVCFH_fmt(&argp->fh));
  49
  50         fh_copy(&resp->fh, &argp->fh);
  51         resp->status = fh_verify(rqstp, &resp->fh, 0,
  52                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  53         if (resp->status != nfs_ok)
  54                 goto out;
  55
  56         resp->status = fh_getattr(&resp->fh, &resp->stat);
  57 out:
  58         return rpc_success;
  59 }
  60
  61 /*
  62  * Set a file's attributes
  63  */
  64 static __be32
  65 nfsd3_proc_setattr(struct svc_rqst *rqstp)
  66 {
  67         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  68         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  69
  70         dprintk("nfsd: SETATTR(3)  %s\n",
  71                                 SVCFH_fmt(&argp->fh));
  72
  73         fh_copy(&resp->fh, &argp->fh);
  74         resp->status = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  75                                     argp->check_guard, argp->guardtime);
  76         return rpc_success;
  77 }
  78
  79 /*
  80  * Look up a path name component
  81  */
  82 static __be32
  83 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  84 {
  85         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  86         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  87
  88         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  89                                 SVCFH_fmt(&argp->fh),
  90                                 argp->len,
  91                                 argp->name);
  92
  93         fh_copy(&resp->dirfh, &argp->fh);
  94         fh_init(&resp->fh, NFS3_FHSIZE);
  95
  96         resp->status = nfsd_lookup(rqstp, &resp->dirfh,
  97                                    argp->name, argp->len,
  98                                    &resp->fh);
  99         return rpc_success;
 100 }
 101
 102 /*
 103  * Check file access
 104  */
 105 static __be32
 106 nfsd3_proc_access(struct svc_rqst *rqstp)
 107 {
 108         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 109         struct nfsd3_accessres *resp = rqstp->rq_resp;
 110
 111         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 112                                 SVCFH_fmt(&argp->fh),
 113                                 argp->access);
 114
 115         fh_copy(&resp->fh, &argp->fh);
 116         resp->access = argp->access;
 117         resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 118         return rpc_success;
 119 }
 120
 121 /*
 122  * Read a symlink.
 123  */
 124 static __be32
 125 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 126 {
 127         struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
 128         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 129
 130         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 131
 132         /* Read the symlink. */
 133         fh_copy(&resp->fh, &argp->fh);
 134         resp->len = NFS3_MAXPATHLEN;
 135         resp->status = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
 136         return rpc_success;
 137 }
 138
 139 /*
 140  * Read a portion of a file.
 141  */
 142 static __be32
 143 nfsd3_proc_read(struct svc_rqst *rqstp)
 144 {
 145         struct nfsd3_readargs *argp = rqstp->rq_argp;
 146         struct nfsd3_readres *resp = rqstp->rq_resp;
 147         u32     max_blocksize = svc_max_payload(rqstp);
 148         unsigned long cnt = min(argp->count, max_blocksize);
 149
 150         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 151                                 SVCFH_fmt(&argp->fh),
 152                                 (unsigned long) argp->count,
 153                                 (unsigned long long) argp->offset);
 154
 155         /* Obtain buffer pointer for payload.
 156          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 157          * + 1 (xdr opaque byte count) = 26
 158          */
 159         resp->count = cnt;
 160         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 161
 162         fh_copy(&resp->fh, &argp->fh);
 163         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 164                                  rqstp->rq_vec, argp->vlen, &resp->count,
 165                                  &resp->eof);
 166         return rpc_success;
 167 }
 168
 169 /*
 170  * Write data to a file
 171  */
 172 static __be32
 173 nfsd3_proc_write(struct svc_rqst *rqstp)
 174 {
 175         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 176         struct nfsd3_writeres *resp = rqstp->rq_resp;
 177         unsigned long cnt = argp->len;
 178         unsigned int nvecs;
 179
 180         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 181                                 SVCFH_fmt(&argp->fh),
 182                                 argp->len,
 183                                 (unsigned long long) argp->offset,
 184                                 argp->stable? " stable" : "");
 185
 186         fh_copy(&resp->fh, &argp->fh);
 187         resp->committed = argp->stable;
 188         nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
 189                                       &argp->first, cnt);
 190         if (!nvecs) {
 191                 resp->status = nfserr_io;
 192                 goto out;
 193         }
 194         resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
 195                                   rqstp->rq_vec, nvecs, &cnt,
 196                                   resp->committed, resp->verf);
 197         resp->count = cnt;
 198 out:
 199         return rpc_success;
 200 }
 201
 202 /*
 203  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 204  * At least in theory; we'll see how it fares in practice when the
 205  * first reports about SunOS compatibility problems start to pour in...
 206  */
 207 static __be32
 208 nfsd3_proc_create(struct svc_rqst *rqstp)
 209 {
 210         struct nfsd3_createargs *argp = rqstp->rq_argp;
 211         struct nfsd3_diropres *resp = rqstp->rq_resp;
 212         svc_fh          *dirfhp, *newfhp = NULL;
 213         struct iattr    *attr;
 214
 215         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 216                                 SVCFH_fmt(&argp->fh),
 217                                 argp->len,
 218                                 argp->name);
 219
 220         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 221         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 222         attr   = &argp->attrs;
 223
 224         /* Unfudge the mode bits */
 225         attr->ia_mode &= ~S_IFMT;
 226         if (!(attr->ia_valid & ATTR_MODE)) {
 227                 attr->ia_valid |= ATTR_MODE;
 228                 attr->ia_mode = S_IFREG;
 229         } else {
 230                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 231         }
 232
 233         /* Now create the file and set attributes */
 234         resp->status = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 235                                       attr, newfhp, argp->createmode,
 236                                       (u32 *)argp->verf, NULL, NULL);
 237         return rpc_success;
 238 }
 239
 240 /*
 241  * Make directory. This operation is not idempotent.
 242  */
 243 static __be32
 244 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 245 {
 246         struct nfsd3_createargs *argp = rqstp->rq_argp;
 247         struct nfsd3_diropres *resp = rqstp->rq_resp;
 248
 249         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 250                                 SVCFH_fmt(&argp->fh),
 251                                 argp->len,
 252                                 argp->name);
 253
 254         argp->attrs.ia_valid &= ~ATTR_SIZE;
 255         fh_copy(&resp->dirfh, &argp->fh);
 256         fh_init(&resp->fh, NFS3_FHSIZE);
 257         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 258                                    &argp->attrs, S_IFDIR, 0, &resp->fh);
 259         fh_unlock(&resp->dirfh);
 260         return rpc_success;
 261 }
 262
 263 static __be32
 264 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 265 {
 266         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 267         struct nfsd3_diropres *resp = rqstp->rq_resp;
 268
 269         if (argp->tlen == 0) {
 270                 resp->status = nfserr_inval;
 271                 goto out;
 272         }
 273         if (argp->tlen > NFS3_MAXPATHLEN) {
 274                 resp->status = nfserr_nametoolong;
 275                 goto out;
 276         }
 277
 278         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 279                                                 page_address(rqstp->rq_arg.pages[0]),
 280                                                 argp->tlen);
 281         if (IS_ERR(argp->tname)) {
 282                 resp->status = nfserrno(PTR_ERR(argp->tname));
 283                 goto out;
 284         }
 285
 286         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 287                                 SVCFH_fmt(&argp->ffh),
 288                                 argp->flen, argp->fname,
 289                                 argp->tlen, argp->tname);
 290
 291         fh_copy(&resp->dirfh, &argp->ffh);
 292         fh_init(&resp->fh, NFS3_FHSIZE);
 293         resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
 294                                     argp->flen, argp->tname, &resp->fh);
 295         kfree(argp->tname);
 296 out:
 297         return rpc_success;
 298 }
 299
 300 /*
 301  * Make socket/fifo/device.
 302  */
 303 static __be32
 304 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 305 {
 306         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 307         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 308         int type;
 309         dev_t   rdev = 0;
 310
 311         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 312                                 SVCFH_fmt(&argp->fh),
 313                                 argp->len,
 314                                 argp->name);
 315
 316         fh_copy(&resp->dirfh, &argp->fh);
 317         fh_init(&resp->fh, NFS3_FHSIZE);
 318
 319         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 320                 rdev = MKDEV(argp->major, argp->minor);
 321                 if (MAJOR(rdev) != argp->major ||
 322                     MINOR(rdev) != argp->minor) {
 323                         resp->status = nfserr_inval;
 324                         goto out;
 325                 }
 326         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 327                 resp->status = nfserr_badtype;
 328                 goto out;
 329         }
 330
 331         type = nfs3_ftypes[argp->ftype];
 332         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 333                                    &argp->attrs, type, rdev, &resp->fh);
 334         fh_unlock(&resp->dirfh);
 335 out:
 336         return rpc_success;
 337 }
 338
 339 /*
 340  * Remove file/fifo/socket etc.
 341  */
 342 static __be32
 343 nfsd3_proc_remove(struct svc_rqst *rqstp)
 344 {
 345         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 346         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 347
 348         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 349                                 SVCFH_fmt(&argp->fh),
 350                                 argp->len,
 351                                 argp->name);
 352
 353         /* Unlink. -S_IFDIR means file must not be a directory */
 354         fh_copy(&resp->fh, &argp->fh);
 355         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 356                                    argp->name, argp->len);
 357         fh_unlock(&resp->fh);
 358         return rpc_success;
 359 }
 360
 361 /*
 362  * Remove a directory
 363  */
 364 static __be32
 365 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 366 {
 367         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 368         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 369
 370         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 371                                 SVCFH_fmt(&argp->fh),
 372                                 argp->len,
 373                                 argp->name);
 374
 375         fh_copy(&resp->fh, &argp->fh);
 376         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 377                                    argp->name, argp->len);
 378         fh_unlock(&resp->fh);
 379         return rpc_success;
 380 }
 381
 382 static __be32
 383 nfsd3_proc_rename(struct svc_rqst *rqstp)
 384 {
 385         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 386         struct nfsd3_renameres *resp = rqstp->rq_resp;
 387
 388         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 389                                 SVCFH_fmt(&argp->ffh),
 390                                 argp->flen,
 391                                 argp->fname);
 392         dprintk("nfsd: -> %s %.*s\n",
 393                                 SVCFH_fmt(&argp->tfh),
 394                                 argp->tlen,
 395                                 argp->tname);
 396
 397         fh_copy(&resp->ffh, &argp->ffh);
 398         fh_copy(&resp->tfh, &argp->tfh);
 399         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 400                                    &resp->tfh, argp->tname, argp->tlen);
 401         return rpc_success;
 402 }
 403
 404 static __be32
 405 nfsd3_proc_link(struct svc_rqst *rqstp)
 406 {
 407         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 408         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 409
 410         dprintk("nfsd: LINK(3)     %s ->\n",
 411                                 SVCFH_fmt(&argp->ffh));
 412         dprintk("nfsd:   -> %s %.*s\n",
 413                                 SVCFH_fmt(&argp->tfh),
 414                                 argp->tlen,
 415                                 argp->tname);
 416
 417         fh_copy(&resp->fh,  &argp->ffh);
 418         fh_copy(&resp->tfh, &argp->tfh);
 419         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 420                                  &resp->fh);
 421         return rpc_success;
 422 }
 423
 424 /*
 425  * Read a portion of a directory.
 426  */
 427 static __be32
 428 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 429 {
 430         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 431         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 432         int             count = 0;
 433         struct page     **p;
 434         caddr_t         page_addr = NULL;
 435
 436         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 437                                 SVCFH_fmt(&argp->fh),
 438                                 argp->count, (u32) argp->cookie);
 439
 440         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 441          * client read size */
 442         count = (argp->count >> 2) - 2;
 443
 444         /* Read directory and encode entries on the fly */
 445         fh_copy(&resp->fh, &argp->fh);
 446
 447         resp->buflen = count;
 448         resp->common.err = nfs_ok;
 449         resp->buffer = argp->buffer;
 450         resp->rqstp = rqstp;
 451         resp->status = nfsd_readdir(rqstp, &resp->fh, (loff_t *)&argp->cookie,
 452                                     &resp->common, nfs3svc_encode_entry);
 453         memcpy(resp->verf, argp->verf, 8);
 454         count = 0;
 455         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 456                 page_addr = page_address(*p);
 457
 458                 if (((caddr_t)resp->buffer >= page_addr) &&
 459                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 460                         count += (caddr_t)resp->buffer - page_addr;
 461                         break;
 462                 }
 463                 count += PAGE_SIZE;
 464         }
 465         resp->count = count >> 2;
 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 rpc_success;
 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         int     count = 0;
 493         loff_t  offset;
 494         struct page **p;
 495         caddr_t page_addr = NULL;
 496
 497         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 498                                 SVCFH_fmt(&argp->fh),
 499                                 argp->count, (u32) argp->cookie);
 500
 501         /* Convert byte count to number of words (i.e. >> 2),
 502          * and reserve room for the NULL ptr & eof flag (-2 words) */
 503         resp->count = (argp->count >> 2) - 2;
 504
 505         /* Read directory and encode entries on the fly */
 506         fh_copy(&resp->fh, &argp->fh);
 507
 508         resp->common.err = nfs_ok;
 509         resp->buffer = argp->buffer;
 510         resp->buflen = resp->count;
 511         resp->rqstp = rqstp;
 512         offset = argp->cookie;
 513
 514         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 515         if (resp->status != nfs_ok)
 516                 goto out;
 517
 518         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 519                 resp->status = nfserr_notsupp;
 520                 goto out;
 521         }
 522
 523         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 524                                     &resp->common, nfs3svc_encode_entry_plus);
 525         memcpy(resp->verf, argp->verf, 8);
 526         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 527                 page_addr = page_address(*p);
 528
 529                 if (((caddr_t)resp->buffer >= page_addr) &&
 530                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 531                         count += (caddr_t)resp->buffer - page_addr;
 532                         break;
 533                 }
 534                 count += PAGE_SIZE;
 535         }
 536         resp->count = count >> 2;
 537         if (resp->offset) {
 538                 if (unlikely(resp->offset1)) {
 539                         /* we ended up with offset on a page boundary */
 540                         *resp->offset = htonl(offset >> 32);
 541                         *resp->offset1 = htonl(offset & 0xffffffff);
 542                         resp->offset1 = NULL;
 543                 } else {
 544                         xdr_encode_hyper(resp->offset, offset);
 545                 }
 546                 resp->offset = NULL;
 547         }
 548
 549 out:
 550         return rpc_success;
 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
 562         dprintk("nfsd: FSSTAT(3)   %s\n",
 563                                 SVCFH_fmt(&argp->fh));
 564
 565         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 566         fh_put(&argp->fh);
 567         return rpc_success;
 568 }
 569
 570 /*
 571  * Get file system info
 572  */
 573 static __be32
 574 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 575 {
 576         struct nfsd_fhandle *argp = rqstp->rq_argp;
 577         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 578         u32     max_blocksize = svc_max_payload(rqstp);
 579
 580         dprintk("nfsd: FSINFO(3)   %s\n",
 581                                 SVCFH_fmt(&argp->fh));
 582
 583         resp->f_rtmax  = max_blocksize;
 584         resp->f_rtpref = max_blocksize;
 585         resp->f_rtmult = PAGE_SIZE;
 586         resp->f_wtmax  = max_blocksize;
 587         resp->f_wtpref = max_blocksize;
 588         resp->f_wtmult = PAGE_SIZE;
 589         resp->f_dtpref = max_blocksize;
 590         resp->f_maxfilesize = ~(u32) 0;
 591         resp->f_properties = NFS3_FSF_DEFAULT;
 592
 593         resp->status = fh_verify(rqstp, &argp->fh, 0,
 594                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 595
 596         /* Check special features of the file system. May request
 597          * different read/write sizes for file systems known to have
 598          * problems with large blocks */
 599         if (resp->status == nfs_ok) {
 600                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 601
 602                 /* Note that we don't care for remote fs's here */
 603                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 604                         resp->f_properties = NFS3_FSF_BILLYBOY;
 605                 }
 606                 resp->f_maxfilesize = sb->s_maxbytes;
 607         }
 608
 609         fh_put(&argp->fh);
 610         return rpc_success;
 611 }
 612
 613 /*
 614  * Get pathconf info for the specified file
 615  */
 616 static __be32
 617 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 618 {
 619         struct nfsd_fhandle *argp = rqstp->rq_argp;
 620         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 621
 622         dprintk("nfsd: PATHCONF(3) %s\n",
 623                                 SVCFH_fmt(&argp->fh));
 624
 625         /* Set default pathconf */
 626         resp->p_link_max = 255;         /* at least */
 627         resp->p_name_max = 255;         /* at least */
 628         resp->p_no_trunc = 0;
 629         resp->p_chown_restricted = 1;
 630         resp->p_case_insensitive = 0;
 631         resp->p_case_preserving = 1;
 632
 633         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 634
 635         if (resp->status == nfs_ok) {
 636                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 637
 638                 /* Note that we don't care for remote fs's here */
 639                 switch (sb->s_magic) {
 640                 case EXT2_SUPER_MAGIC:
 641                         resp->p_link_max = EXT2_LINK_MAX;
 642                         resp->p_name_max = EXT2_NAME_LEN;
 643                         break;
 644                 case MSDOS_SUPER_MAGIC:
 645                         resp->p_case_insensitive = 1;
 646                         resp->p_case_preserving  = 0;
 647                         break;
 648                 }
 649         }
 650
 651         fh_put(&argp->fh);
 652         return rpc_success;
 653 }
 654
 655 /*
 656  * Commit a file (range) to stable storage.
 657  */
 658 static __be32
 659 nfsd3_proc_commit(struct svc_rqst *rqstp)
 660 {
 661         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 662         struct nfsd3_commitres *resp = rqstp->rq_resp;
 663
 664         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 665                                 SVCFH_fmt(&argp->fh),
 666                                 argp->count,
 667                                 (unsigned long long) argp->offset);
 668
 669         if (argp->offset > NFS_OFFSET_MAX) {
 670                 resp->status = nfserr_inval;
 671                 goto out;
 672         }
 673
 674         fh_copy(&resp->fh, &argp->fh);
 675         resp->status = nfsd_commit(rqstp, &resp->fh, argp->offset,
 676                                    argp->count, resp->verf);
 677 out:
 678         return rpc_success;
 679 }
 680
 681
 682 /*
 683  * NFSv3 Server procedures.
 684  * Only the results of non-idempotent operations are cached.
 685  */
 686 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 687 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 688 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 689 #define nfsd3_mkdirargs                 nfsd3_createargs
 690 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 691 #define nfsd3_fhandleargs               nfsd_fhandle
 692 #define nfsd3_fhandleres                nfsd3_attrstat
 693 #define nfsd3_attrstatres               nfsd3_attrstat
 694 #define nfsd3_wccstatres                nfsd3_attrstat
 695 #define nfsd3_createres                 nfsd3_diropres
 696 #define nfsd3_voidres                   nfsd3_voidargs
 697 struct nfsd3_voidargs { int dummy; };
 698
 699 #define ST 1            /* status*/
 700 #define FH 17           /* filehandle with length */
 701 #define AT 21           /* attributes */
 702 #define pAT (1+AT)      /* post attributes - conditional */
 703 #define WC (7+pAT)      /* WCC attributes */
 704
 705 static const struct svc_procedure nfsd_procedures3[22] = {
 706         [NFS3PROC_NULL] = {
 707                 .pc_func = nfsd3_proc_null,
 708                 .pc_decode = nfs3svc_decode_voidarg,
 709                 .pc_encode = nfs3svc_encode_voidres,
 710                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 711                 .pc_ressize = sizeof(struct nfsd3_voidres),
 712                 .pc_cachetype = RC_NOCACHE,
 713                 .pc_xdrressize = ST,
 714         },
 715         [NFS3PROC_GETATTR] = {
 716                 .pc_func = nfsd3_proc_getattr,
 717                 .pc_decode = nfs3svc_decode_fhandleargs,
 718                 .pc_encode = nfs3svc_encode_attrstatres,
 719                 .pc_release = nfs3svc_release_fhandle,
 720                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 721                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 722                 .pc_cachetype = RC_NOCACHE,
 723                 .pc_xdrressize = ST+AT,
 724         },
 725         [NFS3PROC_SETATTR] = {
 726                 .pc_func = nfsd3_proc_setattr,
 727                 .pc_decode = nfs3svc_decode_sattrargs,
 728                 .pc_encode = nfs3svc_encode_wccstatres,
 729                 .pc_release = nfs3svc_release_fhandle,
 730                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 731                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 732                 .pc_cachetype = RC_REPLBUFF,
 733                 .pc_xdrressize = ST+WC,
 734         },
 735         [NFS3PROC_LOOKUP] = {
 736                 .pc_func = nfsd3_proc_lookup,
 737                 .pc_decode = nfs3svc_decode_diropargs,
 738                 .pc_encode = nfs3svc_encode_diropres,
 739                 .pc_release = nfs3svc_release_fhandle2,
 740                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 741                 .pc_ressize = sizeof(struct nfsd3_diropres),
 742                 .pc_cachetype = RC_NOCACHE,
 743                 .pc_xdrressize = ST+FH+pAT+pAT,
 744         },
 745         [NFS3PROC_ACCESS] = {
 746                 .pc_func = nfsd3_proc_access,
 747                 .pc_decode = nfs3svc_decode_accessargs,
 748                 .pc_encode = nfs3svc_encode_accessres,
 749                 .pc_release = nfs3svc_release_fhandle,
 750                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 751                 .pc_ressize = sizeof(struct nfsd3_accessres),
 752                 .pc_cachetype = RC_NOCACHE,
 753                 .pc_xdrressize = ST+pAT+1,
 754         },
 755         [NFS3PROC_READLINK] = {
 756                 .pc_func = nfsd3_proc_readlink,
 757                 .pc_decode = nfs3svc_decode_readlinkargs,
 758                 .pc_encode = nfs3svc_encode_readlinkres,
 759                 .pc_release = nfs3svc_release_fhandle,
 760                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 761                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 762                 .pc_cachetype = RC_NOCACHE,
 763                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 764         },
 765         [NFS3PROC_READ] = {
 766                 .pc_func = nfsd3_proc_read,
 767                 .pc_decode = nfs3svc_decode_readargs,
 768                 .pc_encode = nfs3svc_encode_readres,
 769                 .pc_release = nfs3svc_release_fhandle,
 770                 .pc_argsize = sizeof(struct nfsd3_readargs),
 771                 .pc_ressize = sizeof(struct nfsd3_readres),
 772                 .pc_cachetype = RC_NOCACHE,
 773                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 774         },
 775         [NFS3PROC_WRITE] = {
 776                 .pc_func = nfsd3_proc_write,
 777                 .pc_decode = nfs3svc_decode_writeargs,
 778                 .pc_encode = nfs3svc_encode_writeres,
 779                 .pc_release = nfs3svc_release_fhandle,
 780                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 781                 .pc_ressize = sizeof(struct nfsd3_writeres),
 782                 .pc_cachetype = RC_REPLBUFF,
 783                 .pc_xdrressize = ST+WC+4,
 784         },
 785         [NFS3PROC_CREATE] = {
 786                 .pc_func = nfsd3_proc_create,
 787                 .pc_decode = nfs3svc_decode_createargs,
 788                 .pc_encode = nfs3svc_encode_createres,
 789                 .pc_release = nfs3svc_release_fhandle2,
 790                 .pc_argsize = sizeof(struct nfsd3_createargs),
 791                 .pc_ressize = sizeof(struct nfsd3_createres),
 792                 .pc_cachetype = RC_REPLBUFF,
 793                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 794         },
 795         [NFS3PROC_MKDIR] = {
 796                 .pc_func = nfsd3_proc_mkdir,
 797                 .pc_decode = nfs3svc_decode_mkdirargs,
 798                 .pc_encode = nfs3svc_encode_createres,
 799                 .pc_release = nfs3svc_release_fhandle2,
 800                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 801                 .pc_ressize = sizeof(struct nfsd3_createres),
 802                 .pc_cachetype = RC_REPLBUFF,
 803                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 804         },
 805         [NFS3PROC_SYMLINK] = {
 806                 .pc_func = nfsd3_proc_symlink,
 807                 .pc_decode = nfs3svc_decode_symlinkargs,
 808                 .pc_encode = nfs3svc_encode_createres,
 809                 .pc_release = nfs3svc_release_fhandle2,
 810                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 811                 .pc_ressize = sizeof(struct nfsd3_createres),
 812                 .pc_cachetype = RC_REPLBUFF,
 813                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 814         },
 815         [NFS3PROC_MKNOD] = {
 816                 .pc_func = nfsd3_proc_mknod,
 817                 .pc_decode = nfs3svc_decode_mknodargs,
 818                 .pc_encode = nfs3svc_encode_createres,
 819                 .pc_release = nfs3svc_release_fhandle2,
 820                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 821                 .pc_ressize = sizeof(struct nfsd3_createres),
 822                 .pc_cachetype = RC_REPLBUFF,
 823                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 824         },
 825         [NFS3PROC_REMOVE] = {
 826                 .pc_func = nfsd3_proc_remove,
 827                 .pc_decode = nfs3svc_decode_diropargs,
 828                 .pc_encode = nfs3svc_encode_wccstatres,
 829                 .pc_release = nfs3svc_release_fhandle,
 830                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 831                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 832                 .pc_cachetype = RC_REPLBUFF,
 833                 .pc_xdrressize = ST+WC,
 834         },
 835         [NFS3PROC_RMDIR] = {
 836                 .pc_func = nfsd3_proc_rmdir,
 837                 .pc_decode = nfs3svc_decode_diropargs,
 838                 .pc_encode = nfs3svc_encode_wccstatres,
 839                 .pc_release = nfs3svc_release_fhandle,
 840                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 841                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 842                 .pc_cachetype = RC_REPLBUFF,
 843                 .pc_xdrressize = ST+WC,
 844         },
 845         [NFS3PROC_RENAME] = {
 846                 .pc_func = nfsd3_proc_rename,
 847                 .pc_decode = nfs3svc_decode_renameargs,
 848                 .pc_encode = nfs3svc_encode_renameres,
 849                 .pc_release = nfs3svc_release_fhandle2,
 850                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 851                 .pc_ressize = sizeof(struct nfsd3_renameres),
 852                 .pc_cachetype = RC_REPLBUFF,
 853                 .pc_xdrressize = ST+WC+WC,
 854         },
 855         [NFS3PROC_LINK] = {
 856                 .pc_func = nfsd3_proc_link,
 857                 .pc_decode = nfs3svc_decode_linkargs,
 858                 .pc_encode = nfs3svc_encode_linkres,
 859                 .pc_release = nfs3svc_release_fhandle2,
 860                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 861                 .pc_ressize = sizeof(struct nfsd3_linkres),
 862                 .pc_cachetype = RC_REPLBUFF,
 863                 .pc_xdrressize = ST+pAT+WC,
 864         },
 865         [NFS3PROC_READDIR] = {
 866                 .pc_func = nfsd3_proc_readdir,
 867                 .pc_decode = nfs3svc_decode_readdirargs,
 868                 .pc_encode = nfs3svc_encode_readdirres,
 869                 .pc_release = nfs3svc_release_fhandle,
 870                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 871                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 872                 .pc_cachetype = RC_NOCACHE,
 873         },
 874         [NFS3PROC_READDIRPLUS] = {
 875                 .pc_func = nfsd3_proc_readdirplus,
 876                 .pc_decode = nfs3svc_decode_readdirplusargs,
 877                 .pc_encode = nfs3svc_encode_readdirres,
 878                 .pc_release = nfs3svc_release_fhandle,
 879                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 880                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 881                 .pc_cachetype = RC_NOCACHE,
 882         },
 883         [NFS3PROC_FSSTAT] = {
 884                 .pc_func = nfsd3_proc_fsstat,
 885                 .pc_decode = nfs3svc_decode_fhandleargs,
 886                 .pc_encode = nfs3svc_encode_fsstatres,
 887                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 888                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 889                 .pc_cachetype = RC_NOCACHE,
 890                 .pc_xdrressize = ST+pAT+2*6+1,
 891         },
 892         [NFS3PROC_FSINFO] = {
 893                 .pc_func = nfsd3_proc_fsinfo,
 894                 .pc_decode = nfs3svc_decode_fhandleargs,
 895                 .pc_encode = nfs3svc_encode_fsinfores,
 896                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 897                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 898                 .pc_cachetype = RC_NOCACHE,
 899                 .pc_xdrressize = ST+pAT+12,
 900         },
 901         [NFS3PROC_PATHCONF] = {
 902                 .pc_func = nfsd3_proc_pathconf,
 903                 .pc_decode = nfs3svc_decode_fhandleargs,
 904                 .pc_encode = nfs3svc_encode_pathconfres,
 905                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 906                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 907                 .pc_cachetype = RC_NOCACHE,
 908                 .pc_xdrressize = ST+pAT+6,
 909         },
 910         [NFS3PROC_COMMIT] = {
 911                 .pc_func = nfsd3_proc_commit,
 912                 .pc_decode = nfs3svc_decode_commitargs,
 913                 .pc_encode = nfs3svc_encode_commitres,
 914                 .pc_release = nfs3svc_release_fhandle,
 915                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 916                 .pc_ressize = sizeof(struct nfsd3_commitres),
 917                 .pc_cachetype = RC_NOCACHE,
 918                 .pc_xdrressize = ST+WC+2,
 919         },
 920 };
 921
 922 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 923 const struct svc_version nfsd_version3 = {
 924         .vs_vers        = 3,
 925         .vs_nproc       = 22,
 926         .vs_proc        = nfsd_procedures3,
 927         .vs_dispatch    = nfsd_dispatch,
 928         .vs_count       = nfsd_count3,
 929         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 930 };