fs/nfsd/nfs3proc.c

   1 /*
   2  * Process version 3 NFS requests.
   3  *
   4  * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #include <linux/fs.h>
   8 #include <linux/ext2_fs.h>
   9 #include <linux/magic.h>
  10
  11 #include "cache.h"
  12 #include "xdr3.h"
  13 #include "vfs.h"
  14
  15 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  16
  17 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  18
  19 static int      nfs3_ftypes[] = {
  20         0,                      /* NF3NON */
  21         S_IFREG,                /* NF3REG */
  22         S_IFDIR,                /* NF3DIR */
  23         S_IFBLK,                /* NF3BLK */
  24         S_IFCHR,                /* NF3CHR */
  25         S_IFLNK,                /* NF3LNK */
  26         S_IFSOCK,               /* NF3SOCK */
  27         S_IFIFO,                /* NF3FIFO */
  28 };
  29
  30 /*
  31  * NULL call.
  32  */
  33 static __be32
  34 nfsd3_proc_null(struct svc_rqst *rqstp)
  35 {
  36         return nfs_ok;
  37 }
  38
  39 /*
  40  * Get a file's attributes
  41  */
  42 static __be32
  43 nfsd3_proc_getattr(struct svc_rqst *rqstp)
  44 {
  45         struct nfsd_fhandle *argp = rqstp->rq_argp;
  46         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  47         __be32  nfserr;
  48
  49         dprintk("nfsd: GETATTR(3)  %s\n",
  50                 SVCFH_fmt(&argp->fh));
  51
  52         fh_copy(&resp->fh, &argp->fh);
  53         nfserr = fh_verify(rqstp, &resp->fh, 0,
  54                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  55         if (nfserr)
  56                 RETURN_STATUS(nfserr);
  57
  58         nfserr = fh_getattr(&resp->fh, &resp->stat);
  59
  60         RETURN_STATUS(nfserr);
  61 }
  62
  63 /*
  64  * Set a file's attributes
  65  */
  66 static __be32
  67 nfsd3_proc_setattr(struct svc_rqst *rqstp)
  68 {
  69         struct nfsd3_sattrargs *argp = rqstp->rq_argp;
  70         struct nfsd3_attrstat *resp = rqstp->rq_resp;
  71         __be32  nfserr;
  72
  73         dprintk("nfsd: SETATTR(3)  %s\n",
  74                                 SVCFH_fmt(&argp->fh));
  75
  76         fh_copy(&resp->fh, &argp->fh);
  77         nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
  78                               argp->check_guard, argp->guardtime);
  79         RETURN_STATUS(nfserr);
  80 }
  81
  82 /*
  83  * Look up a path name component
  84  */
  85 static __be32
  86 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  87 {
  88         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  89         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  90         __be32  nfserr;
  91
  92         dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
  93                                 SVCFH_fmt(&argp->fh),
  94                                 argp->len,
  95                                 argp->name);
  96
  97         fh_copy(&resp->dirfh, &argp->fh);
  98         fh_init(&resp->fh, NFS3_FHSIZE);
  99
 100         nfserr = nfsd_lookup(rqstp, &resp->dirfh,
 101                                     argp->name,
 102                                     argp->len,
 103                                     &resp->fh);
 104         RETURN_STATUS(nfserr);
 105 }
 106
 107 /*
 108  * Check file access
 109  */
 110 static __be32
 111 nfsd3_proc_access(struct svc_rqst *rqstp)
 112 {
 113         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 114         struct nfsd3_accessres *resp = rqstp->rq_resp;
 115         __be32  nfserr;
 116
 117         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 118                                 SVCFH_fmt(&argp->fh),
 119                                 argp->access);
 120
 121         fh_copy(&resp->fh, &argp->fh);
 122         resp->access = argp->access;
 123         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 124         RETURN_STATUS(nfserr);
 125 }
 126
 127 /*
 128  * Read a symlink.
 129  */
 130 static __be32
 131 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 132 {
 133         struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
 134         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 135         __be32 nfserr;
 136
 137         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 138
 139         /* Read the symlink. */
 140         fh_copy(&resp->fh, &argp->fh);
 141         resp->len = NFS3_MAXPATHLEN;
 142         nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
 143         RETURN_STATUS(nfserr);
 144 }
 145
 146 /*
 147  * Read a portion of a file.
 148  */
 149 static __be32
 150 nfsd3_proc_read(struct svc_rqst *rqstp)
 151 {
 152         struct nfsd3_readargs *argp = rqstp->rq_argp;
 153         struct nfsd3_readres *resp = rqstp->rq_resp;
 154         __be32  nfserr;
 155         u32     max_blocksize = svc_max_payload(rqstp);
 156         unsigned long cnt = min(argp->count, max_blocksize);
 157
 158         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 159                                 SVCFH_fmt(&argp->fh),
 160                                 (unsigned long) argp->count,
 161                                 (unsigned long long) argp->offset);
 162
 163         /* Obtain buffer pointer for payload.
 164          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 165          * + 1 (xdr opaque byte count) = 26
 166          */
 167         resp->count = cnt;
 168         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
 169
 170         fh_copy(&resp->fh, &argp->fh);
 171         nfserr = nfsd_read(rqstp, &resp->fh,
 172                                   argp->offset,
 173                                   rqstp->rq_vec, argp->vlen,
 174                                   &resp->count);
 175         if (nfserr == 0) {
 176                 struct inode    *inode = d_inode(resp->fh.fh_dentry);
 177                 resp->eof = nfsd_eof_on_read(cnt, resp->count, argp->offset,
 178                                                         inode->i_size);
 179         }
 180
 181         RETURN_STATUS(nfserr);
 182 }
 183
 184 /*
 185  * Write data to a file
 186  */
 187 static __be32
 188 nfsd3_proc_write(struct svc_rqst *rqstp)
 189 {
 190         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 191         struct nfsd3_writeres *resp = rqstp->rq_resp;
 192         __be32  nfserr;
 193         unsigned long cnt = argp->len;
 194
 195         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 196                                 SVCFH_fmt(&argp->fh),
 197                                 argp->len,
 198                                 (unsigned long long) argp->offset,
 199                                 argp->stable? " stable" : "");
 200
 201         fh_copy(&resp->fh, &argp->fh);
 202         resp->committed = argp->stable;
 203         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 204                                 rqstp->rq_vec, argp->vlen,
 205                                 &cnt, resp->committed);
 206         resp->count = cnt;
 207         RETURN_STATUS(nfserr);
 208 }
 209
 210 /*
 211  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 212  * At least in theory; we'll see how it fares in practice when the
 213  * first reports about SunOS compatibility problems start to pour in...
 214  */
 215 static __be32
 216 nfsd3_proc_create(struct svc_rqst *rqstp)
 217 {
 218         struct nfsd3_createargs *argp = rqstp->rq_argp;
 219         struct nfsd3_diropres *resp = rqstp->rq_resp;
 220         svc_fh          *dirfhp, *newfhp = NULL;
 221         struct iattr    *attr;
 222         __be32          nfserr;
 223
 224         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 225                                 SVCFH_fmt(&argp->fh),
 226                                 argp->len,
 227                                 argp->name);
 228
 229         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 230         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 231         attr   = &argp->attrs;
 232
 233         /* Unfudge the mode bits */
 234         attr->ia_mode &= ~S_IFMT;
 235         if (!(attr->ia_valid & ATTR_MODE)) {
 236                 attr->ia_valid |= ATTR_MODE;
 237                 attr->ia_mode = S_IFREG;
 238         } else {
 239                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 240         }
 241
 242         /* Now create the file and set attributes */
 243         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 244                                 attr, newfhp,
 245                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
 246
 247         RETURN_STATUS(nfserr);
 248 }
 249
 250 /*
 251  * Make directory. This operation is not idempotent.
 252  */
 253 static __be32
 254 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 255 {
 256         struct nfsd3_createargs *argp = rqstp->rq_argp;
 257         struct nfsd3_diropres *resp = rqstp->rq_resp;
 258         __be32  nfserr;
 259
 260         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 261                                 SVCFH_fmt(&argp->fh),
 262                                 argp->len,
 263                                 argp->name);
 264
 265         argp->attrs.ia_valid &= ~ATTR_SIZE;
 266         fh_copy(&resp->dirfh, &argp->fh);
 267         fh_init(&resp->fh, NFS3_FHSIZE);
 268         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 269                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 270         fh_unlock(&resp->dirfh);
 271         RETURN_STATUS(nfserr);
 272 }
 273
 274 static __be32
 275 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 276 {
 277         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 278         struct nfsd3_diropres *resp = rqstp->rq_resp;
 279         __be32  nfserr;
 280
 281         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 282                                 SVCFH_fmt(&argp->ffh),
 283                                 argp->flen, argp->fname,
 284                                 argp->tlen, argp->tname);
 285
 286         fh_copy(&resp->dirfh, &argp->ffh);
 287         fh_init(&resp->fh, NFS3_FHSIZE);
 288         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 289                                                    argp->tname, &resp->fh);
 290         RETURN_STATUS(nfserr);
 291 }
 292
 293 /*
 294  * Make socket/fifo/device.
 295  */
 296 static __be32
 297 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 298 {
 299         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 300         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 301         __be32  nfserr;
 302         int type;
 303         dev_t   rdev = 0;
 304
 305         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 306                                 SVCFH_fmt(&argp->fh),
 307                                 argp->len,
 308                                 argp->name);
 309
 310         fh_copy(&resp->dirfh, &argp->fh);
 311         fh_init(&resp->fh, NFS3_FHSIZE);
 312
 313         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 314                 RETURN_STATUS(nfserr_inval);
 315         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 316                 rdev = MKDEV(argp->major, argp->minor);
 317                 if (MAJOR(rdev) != argp->major ||
 318                     MINOR(rdev) != argp->minor)
 319                         RETURN_STATUS(nfserr_inval);
 320         } else
 321                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 322                         RETURN_STATUS(nfserr_inval);
 323
 324         type = nfs3_ftypes[argp->ftype];
 325         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 326                                     &argp->attrs, type, rdev, &resp->fh);
 327         fh_unlock(&resp->dirfh);
 328         RETURN_STATUS(nfserr);
 329 }
 330
 331 /*
 332  * Remove file/fifo/socket etc.
 333  */
 334 static __be32
 335 nfsd3_proc_remove(struct svc_rqst *rqstp)
 336 {
 337         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 338         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 339         __be32  nfserr;
 340
 341         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 342                                 SVCFH_fmt(&argp->fh),
 343                                 argp->len,
 344                                 argp->name);
 345
 346         /* Unlink. -S_IFDIR means file must not be a directory */
 347         fh_copy(&resp->fh, &argp->fh);
 348         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 349         fh_unlock(&resp->fh);
 350         RETURN_STATUS(nfserr);
 351 }
 352
 353 /*
 354  * Remove a directory
 355  */
 356 static __be32
 357 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 358 {
 359         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 360         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 361         __be32  nfserr;
 362
 363         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 364                                 SVCFH_fmt(&argp->fh),
 365                                 argp->len,
 366                                 argp->name);
 367
 368         fh_copy(&resp->fh, &argp->fh);
 369         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 370         fh_unlock(&resp->fh);
 371         RETURN_STATUS(nfserr);
 372 }
 373
 374 static __be32
 375 nfsd3_proc_rename(struct svc_rqst *rqstp)
 376 {
 377         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 378         struct nfsd3_renameres *resp = rqstp->rq_resp;
 379         __be32  nfserr;
 380
 381         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 382                                 SVCFH_fmt(&argp->ffh),
 383                                 argp->flen,
 384                                 argp->fname);
 385         dprintk("nfsd: -> %s %.*s\n",
 386                                 SVCFH_fmt(&argp->tfh),
 387                                 argp->tlen,
 388                                 argp->tname);
 389
 390         fh_copy(&resp->ffh, &argp->ffh);
 391         fh_copy(&resp->tfh, &argp->tfh);
 392         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 393                                     &resp->tfh, argp->tname, argp->tlen);
 394         RETURN_STATUS(nfserr);
 395 }
 396
 397 static __be32
 398 nfsd3_proc_link(struct svc_rqst *rqstp)
 399 {
 400         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 401         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 402         __be32  nfserr;
 403
 404         dprintk("nfsd: LINK(3)     %s ->\n",
 405                                 SVCFH_fmt(&argp->ffh));
 406         dprintk("nfsd:   -> %s %.*s\n",
 407                                 SVCFH_fmt(&argp->tfh),
 408                                 argp->tlen,
 409                                 argp->tname);
 410
 411         fh_copy(&resp->fh,  &argp->ffh);
 412         fh_copy(&resp->tfh, &argp->tfh);
 413         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 414                                   &resp->fh);
 415         RETURN_STATUS(nfserr);
 416 }
 417
 418 /*
 419  * Read a portion of a directory.
 420  */
 421 static __be32
 422 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 423 {
 424         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 425         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 426         __be32          nfserr;
 427         int             count;
 428
 429         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 430                                 SVCFH_fmt(&argp->fh),
 431                                 argp->count, (u32) argp->cookie);
 432
 433         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 434          * client read size */
 435         count = (argp->count >> 2) - 2;
 436
 437         /* Read directory and encode entries on the fly */
 438         fh_copy(&resp->fh, &argp->fh);
 439
 440         resp->buflen = count;
 441         resp->common.err = nfs_ok;
 442         resp->buffer = argp->buffer;
 443         resp->rqstp = rqstp;
 444         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
 445                                         &resp->common, nfs3svc_encode_entry);
 446         memcpy(resp->verf, argp->verf, 8);
 447         resp->count = resp->buffer - argp->buffer;
 448         if (resp->offset)
 449                 xdr_encode_hyper(resp->offset, argp->cookie);
 450
 451         RETURN_STATUS(nfserr);
 452 }
 453
 454 /*
 455  * Read a portion of a directory, including file handles and attrs.
 456  * For now, we choose to ignore the dircount parameter.
 457  */
 458 static __be32
 459 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 460 {
 461         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 462         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 463         __be32  nfserr;
 464         int     count = 0;
 465         loff_t  offset;
 466         struct page **p;
 467         caddr_t page_addr = NULL;
 468
 469         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 470                                 SVCFH_fmt(&argp->fh),
 471                                 argp->count, (u32) argp->cookie);
 472
 473         /* Convert byte count to number of words (i.e. >> 2),
 474          * and reserve room for the NULL ptr & eof flag (-2 words) */
 475         resp->count = (argp->count >> 2) - 2;
 476
 477         /* Read directory and encode entries on the fly */
 478         fh_copy(&resp->fh, &argp->fh);
 479
 480         resp->common.err = nfs_ok;
 481         resp->buffer = argp->buffer;
 482         resp->buflen = resp->count;
 483         resp->rqstp = rqstp;
 484         offset = argp->cookie;
 485
 486         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 487         if (nfserr)
 488                 RETURN_STATUS(nfserr);
 489
 490         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 491                 RETURN_STATUS(nfserr_notsupp);
 492
 493         nfserr = nfsd_readdir(rqstp, &resp->fh,
 494                                      &offset,
 495                                      &resp->common,
 496                                      nfs3svc_encode_entry_plus);
 497         memcpy(resp->verf, argp->verf, 8);
 498         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 499                 page_addr = page_address(*p);
 500
 501                 if (((caddr_t)resp->buffer >= page_addr) &&
 502                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 503                         count += (caddr_t)resp->buffer - page_addr;
 504                         break;
 505                 }
 506                 count += PAGE_SIZE;
 507         }
 508         resp->count = count >> 2;
 509         if (resp->offset) {
 510                 if (unlikely(resp->offset1)) {
 511                         /* we ended up with offset on a page boundary */
 512                         *resp->offset = htonl(offset >> 32);
 513                         *resp->offset1 = htonl(offset & 0xffffffff);
 514                         resp->offset1 = NULL;
 515                 } else {
 516                         xdr_encode_hyper(resp->offset, offset);
 517                 }
 518         }
 519
 520         RETURN_STATUS(nfserr);
 521 }
 522
 523 /*
 524  * Get file system stats
 525  */
 526 static __be32
 527 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 528 {
 529         struct nfsd_fhandle *argp = rqstp->rq_argp;
 530         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 531         __be32  nfserr;
 532
 533         dprintk("nfsd: FSSTAT(3)   %s\n",
 534                                 SVCFH_fmt(&argp->fh));
 535
 536         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 537         fh_put(&argp->fh);
 538         RETURN_STATUS(nfserr);
 539 }
 540
 541 /*
 542  * Get file system info
 543  */
 544 static __be32
 545 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 546 {
 547         struct nfsd_fhandle *argp = rqstp->rq_argp;
 548         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 549         __be32  nfserr;
 550         u32     max_blocksize = svc_max_payload(rqstp);
 551
 552         dprintk("nfsd: FSINFO(3)   %s\n",
 553                                 SVCFH_fmt(&argp->fh));
 554
 555         resp->f_rtmax  = max_blocksize;
 556         resp->f_rtpref = max_blocksize;
 557         resp->f_rtmult = PAGE_SIZE;
 558         resp->f_wtmax  = max_blocksize;
 559         resp->f_wtpref = max_blocksize;
 560         resp->f_wtmult = PAGE_SIZE;
 561         resp->f_dtpref = PAGE_SIZE;
 562         resp->f_maxfilesize = ~(u32) 0;
 563         resp->f_properties = NFS3_FSF_DEFAULT;
 564
 565         nfserr = fh_verify(rqstp, &argp->fh, 0,
 566                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 567
 568         /* Check special features of the file system. May request
 569          * different read/write sizes for file systems known to have
 570          * problems with large blocks */
 571         if (nfserr == 0) {
 572                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 573
 574                 /* Note that we don't care for remote fs's here */
 575                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 576                         resp->f_properties = NFS3_FSF_BILLYBOY;
 577                 }
 578                 resp->f_maxfilesize = sb->s_maxbytes;
 579         }
 580
 581         fh_put(&argp->fh);
 582         RETURN_STATUS(nfserr);
 583 }
 584
 585 /*
 586  * Get pathconf info for the specified file
 587  */
 588 static __be32
 589 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 590 {
 591         struct nfsd_fhandle *argp = rqstp->rq_argp;
 592         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 593         __be32  nfserr;
 594
 595         dprintk("nfsd: PATHCONF(3) %s\n",
 596                                 SVCFH_fmt(&argp->fh));
 597
 598         /* Set default pathconf */
 599         resp->p_link_max = 255;         /* at least */
 600         resp->p_name_max = 255;         /* at least */
 601         resp->p_no_trunc = 0;
 602         resp->p_chown_restricted = 1;
 603         resp->p_case_insensitive = 0;
 604         resp->p_case_preserving = 1;
 605
 606         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 607
 608         if (nfserr == 0) {
 609                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 610
 611                 /* Note that we don't care for remote fs's here */
 612                 switch (sb->s_magic) {
 613                 case EXT2_SUPER_MAGIC:
 614                         resp->p_link_max = EXT2_LINK_MAX;
 615                         resp->p_name_max = EXT2_NAME_LEN;
 616                         break;
 617                 case MSDOS_SUPER_MAGIC:
 618                         resp->p_case_insensitive = 1;
 619                         resp->p_case_preserving  = 0;
 620                         break;
 621                 }
 622         }
 623
 624         fh_put(&argp->fh);
 625         RETURN_STATUS(nfserr);
 626 }
 627
 628
 629 /*
 630  * Commit a file (range) to stable storage.
 631  */
 632 static __be32
 633 nfsd3_proc_commit(struct svc_rqst *rqstp)
 634 {
 635         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 636         struct nfsd3_commitres *resp = rqstp->rq_resp;
 637         __be32  nfserr;
 638
 639         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 640                                 SVCFH_fmt(&argp->fh),
 641                                 argp->count,
 642                                 (unsigned long long) argp->offset);
 643
 644         if (argp->offset > NFS_OFFSET_MAX)
 645                 RETURN_STATUS(nfserr_inval);
 646
 647         fh_copy(&resp->fh, &argp->fh);
 648         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 649
 650         RETURN_STATUS(nfserr);
 651 }
 652
 653
 654 /*
 655  * NFSv3 Server procedures.
 656  * Only the results of non-idempotent operations are cached.
 657  */
 658 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 659 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 660 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 661 #define nfsd3_mkdirargs                 nfsd3_createargs
 662 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 663 #define nfsd3_fhandleargs               nfsd_fhandle
 664 #define nfsd3_fhandleres                nfsd3_attrstat
 665 #define nfsd3_attrstatres               nfsd3_attrstat
 666 #define nfsd3_wccstatres                nfsd3_attrstat
 667 #define nfsd3_createres                 nfsd3_diropres
 668 #define nfsd3_voidres                   nfsd3_voidargs
 669 struct nfsd3_voidargs { int dummy; };
 670
 671 #define ST 1            /* status*/
 672 #define FH 17           /* filehandle with length */
 673 #define AT 21           /* attributes */
 674 #define pAT (1+AT)      /* post attributes - conditional */
 675 #define WC (7+pAT)      /* WCC attributes */
 676
 677 static const struct svc_procedure nfsd_procedures3[22] = {
 678         [NFS3PROC_NULL] = {
 679                 .pc_func = nfsd3_proc_null,
 680                 .pc_encode = nfs3svc_encode_voidres,
 681                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 682                 .pc_ressize = sizeof(struct nfsd3_voidres),
 683                 .pc_cachetype = RC_NOCACHE,
 684                 .pc_xdrressize = ST,
 685         },
 686         [NFS3PROC_GETATTR] = {
 687                 .pc_func = nfsd3_proc_getattr,
 688                 .pc_decode = nfs3svc_decode_fhandleargs,
 689                 .pc_encode = nfs3svc_encode_attrstatres,
 690                 .pc_release = nfs3svc_release_fhandle,
 691                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 692                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 693                 .pc_cachetype = RC_NOCACHE,
 694                 .pc_xdrressize = ST+AT,
 695         },
 696         [NFS3PROC_SETATTR] = {
 697                 .pc_func = nfsd3_proc_setattr,
 698                 .pc_decode = nfs3svc_decode_sattrargs,
 699                 .pc_encode = nfs3svc_encode_wccstatres,
 700                 .pc_release = nfs3svc_release_fhandle,
 701                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 702                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 703                 .pc_cachetype = RC_REPLBUFF,
 704                 .pc_xdrressize = ST+WC,
 705         },
 706         [NFS3PROC_LOOKUP] = {
 707                 .pc_func = nfsd3_proc_lookup,
 708                 .pc_decode = nfs3svc_decode_diropargs,
 709                 .pc_encode = nfs3svc_encode_diropres,
 710                 .pc_release = nfs3svc_release_fhandle2,
 711                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 712                 .pc_ressize = sizeof(struct nfsd3_diropres),
 713                 .pc_cachetype = RC_NOCACHE,
 714                 .pc_xdrressize = ST+FH+pAT+pAT,
 715         },
 716         [NFS3PROC_ACCESS] = {
 717                 .pc_func = nfsd3_proc_access,
 718                 .pc_decode = nfs3svc_decode_accessargs,
 719                 .pc_encode = nfs3svc_encode_accessres,
 720                 .pc_release = nfs3svc_release_fhandle,
 721                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 722                 .pc_ressize = sizeof(struct nfsd3_accessres),
 723                 .pc_cachetype = RC_NOCACHE,
 724                 .pc_xdrressize = ST+pAT+1,
 725         },
 726         [NFS3PROC_READLINK] = {
 727                 .pc_func = nfsd3_proc_readlink,
 728                 .pc_decode = nfs3svc_decode_readlinkargs,
 729                 .pc_encode = nfs3svc_encode_readlinkres,
 730                 .pc_release = nfs3svc_release_fhandle,
 731                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 732                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 733                 .pc_cachetype = RC_NOCACHE,
 734                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 735         },
 736         [NFS3PROC_READ] = {
 737                 .pc_func = nfsd3_proc_read,
 738                 .pc_decode = nfs3svc_decode_readargs,
 739                 .pc_encode = nfs3svc_encode_readres,
 740                 .pc_release = nfs3svc_release_fhandle,
 741                 .pc_argsize = sizeof(struct nfsd3_readargs),
 742                 .pc_ressize = sizeof(struct nfsd3_readres),
 743                 .pc_cachetype = RC_NOCACHE,
 744                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 745         },
 746         [NFS3PROC_WRITE] = {
 747                 .pc_func = nfsd3_proc_write,
 748                 .pc_decode = nfs3svc_decode_writeargs,
 749                 .pc_encode = nfs3svc_encode_writeres,
 750                 .pc_release = nfs3svc_release_fhandle,
 751                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 752                 .pc_ressize = sizeof(struct nfsd3_writeres),
 753                 .pc_cachetype = RC_REPLBUFF,
 754                 .pc_xdrressize = ST+WC+4,
 755         },
 756         [NFS3PROC_CREATE] = {
 757                 .pc_func = nfsd3_proc_create,
 758                 .pc_decode = nfs3svc_decode_createargs,
 759                 .pc_encode = nfs3svc_encode_createres,
 760                 .pc_release = nfs3svc_release_fhandle2,
 761                 .pc_argsize = sizeof(struct nfsd3_createargs),
 762                 .pc_ressize = sizeof(struct nfsd3_createres),
 763                 .pc_cachetype = RC_REPLBUFF,
 764                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 765         },
 766         [NFS3PROC_MKDIR] = {
 767                 .pc_func = nfsd3_proc_mkdir,
 768                 .pc_decode = nfs3svc_decode_mkdirargs,
 769                 .pc_encode = nfs3svc_encode_createres,
 770                 .pc_release = nfs3svc_release_fhandle2,
 771                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 772                 .pc_ressize = sizeof(struct nfsd3_createres),
 773                 .pc_cachetype = RC_REPLBUFF,
 774                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 775         },
 776         [NFS3PROC_SYMLINK] = {
 777                 .pc_func = nfsd3_proc_symlink,
 778                 .pc_decode = nfs3svc_decode_symlinkargs,
 779                 .pc_encode = nfs3svc_encode_createres,
 780                 .pc_release = nfs3svc_release_fhandle2,
 781                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 782                 .pc_ressize = sizeof(struct nfsd3_createres),
 783                 .pc_cachetype = RC_REPLBUFF,
 784                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 785         },
 786         [NFS3PROC_MKNOD] = {
 787                 .pc_func = nfsd3_proc_mknod,
 788                 .pc_decode = nfs3svc_decode_mknodargs,
 789                 .pc_encode = nfs3svc_encode_createres,
 790                 .pc_release = nfs3svc_release_fhandle2,
 791                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 792                 .pc_ressize = sizeof(struct nfsd3_createres),
 793                 .pc_cachetype = RC_REPLBUFF,
 794                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 795         },
 796         [NFS3PROC_REMOVE] = {
 797                 .pc_func = nfsd3_proc_remove,
 798                 .pc_decode = nfs3svc_decode_diropargs,
 799                 .pc_encode = nfs3svc_encode_wccstatres,
 800                 .pc_release = nfs3svc_release_fhandle,
 801                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 802                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 803                 .pc_cachetype = RC_REPLBUFF,
 804                 .pc_xdrressize = ST+WC,
 805         },
 806         [NFS3PROC_RMDIR] = {
 807                 .pc_func = nfsd3_proc_rmdir,
 808                 .pc_decode = nfs3svc_decode_diropargs,
 809                 .pc_encode = nfs3svc_encode_wccstatres,
 810                 .pc_release = nfs3svc_release_fhandle,
 811                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 812                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 813                 .pc_cachetype = RC_REPLBUFF,
 814                 .pc_xdrressize = ST+WC,
 815         },
 816         [NFS3PROC_RENAME] = {
 817                 .pc_func = nfsd3_proc_rename,
 818                 .pc_decode = nfs3svc_decode_renameargs,
 819                 .pc_encode = nfs3svc_encode_renameres,
 820                 .pc_release = nfs3svc_release_fhandle2,
 821                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 822                 .pc_ressize = sizeof(struct nfsd3_renameres),
 823                 .pc_cachetype = RC_REPLBUFF,
 824                 .pc_xdrressize = ST+WC+WC,
 825         },
 826         [NFS3PROC_LINK] = {
 827                 .pc_func = nfsd3_proc_link,
 828                 .pc_decode = nfs3svc_decode_linkargs,
 829                 .pc_encode = nfs3svc_encode_linkres,
 830                 .pc_release = nfs3svc_release_fhandle2,
 831                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 832                 .pc_ressize = sizeof(struct nfsd3_linkres),
 833                 .pc_cachetype = RC_REPLBUFF,
 834                 .pc_xdrressize = ST+pAT+WC,
 835         },
 836         [NFS3PROC_READDIR] = {
 837                 .pc_func = nfsd3_proc_readdir,
 838                 .pc_decode = nfs3svc_decode_readdirargs,
 839                 .pc_encode = nfs3svc_encode_readdirres,
 840                 .pc_release = nfs3svc_release_fhandle,
 841                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 842                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 843                 .pc_cachetype = RC_NOCACHE,
 844         },
 845         [NFS3PROC_READDIRPLUS] = {
 846                 .pc_func = nfsd3_proc_readdirplus,
 847                 .pc_decode = nfs3svc_decode_readdirplusargs,
 848                 .pc_encode = nfs3svc_encode_readdirres,
 849                 .pc_release = nfs3svc_release_fhandle,
 850                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 851                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 852                 .pc_cachetype = RC_NOCACHE,
 853         },
 854         [NFS3PROC_FSSTAT] = {
 855                 .pc_func = nfsd3_proc_fsstat,
 856                 .pc_decode = nfs3svc_decode_fhandleargs,
 857                 .pc_encode = nfs3svc_encode_fsstatres,
 858                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 859                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 860                 .pc_cachetype = RC_NOCACHE,
 861                 .pc_xdrressize = ST+pAT+2*6+1,
 862         },
 863         [NFS3PROC_FSINFO] = {
 864                 .pc_func = nfsd3_proc_fsinfo,
 865                 .pc_decode = nfs3svc_decode_fhandleargs,
 866                 .pc_encode = nfs3svc_encode_fsinfores,
 867                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 868                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 869                 .pc_cachetype = RC_NOCACHE,
 870                 .pc_xdrressize = ST+pAT+12,
 871         },
 872         [NFS3PROC_PATHCONF] = {
 873                 .pc_func = nfsd3_proc_pathconf,
 874                 .pc_decode = nfs3svc_decode_fhandleargs,
 875                 .pc_encode = nfs3svc_encode_pathconfres,
 876                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 877                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 878                 .pc_cachetype = RC_NOCACHE,
 879                 .pc_xdrressize = ST+pAT+6,
 880         },
 881         [NFS3PROC_COMMIT] = {
 882                 .pc_func = nfsd3_proc_commit,
 883                 .pc_decode = nfs3svc_decode_commitargs,
 884                 .pc_encode = nfs3svc_encode_commitres,
 885                 .pc_release = nfs3svc_release_fhandle,
 886                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 887                 .pc_ressize = sizeof(struct nfsd3_commitres),
 888                 .pc_cachetype = RC_NOCACHE,
 889                 .pc_xdrressize = ST+WC+2,
 890         },
 891 };
 892
 893 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 894 const struct svc_version nfsd_version3 = {
 895         .vs_vers        = 3,
 896         .vs_nproc       = 22,
 897         .vs_proc        = nfsd_procedures3,
 898         .vs_dispatch    = nfsd_dispatch,
 899         .vs_count       = nfsd_count3,
 900         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 901 };