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
 196         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 197                                 SVCFH_fmt(&argp->fh),
 198                                 argp->len,
 199                                 (unsigned long long) argp->offset,
 200                                 argp->stable? " stable" : "");
 201
 202         fh_copy(&resp->fh, &argp->fh);
 203         resp->committed = argp->stable;
 204         nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
 205                                 rqstp->rq_vec, argp->vlen,
 206                                 &cnt, resp->committed);
 207         resp->count = cnt;
 208         RETURN_STATUS(nfserr);
 209 }
 210
 211 /*
 212  * With NFSv3, CREATE processing is a lot easier than with NFSv2.
 213  * At least in theory; we'll see how it fares in practice when the
 214  * first reports about SunOS compatibility problems start to pour in...
 215  */
 216 static __be32
 217 nfsd3_proc_create(struct svc_rqst *rqstp)
 218 {
 219         struct nfsd3_createargs *argp = rqstp->rq_argp;
 220         struct nfsd3_diropres *resp = rqstp->rq_resp;
 221         svc_fh          *dirfhp, *newfhp = NULL;
 222         struct iattr    *attr;
 223         __be32          nfserr;
 224
 225         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 226                                 SVCFH_fmt(&argp->fh),
 227                                 argp->len,
 228                                 argp->name);
 229
 230         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 231         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 232         attr   = &argp->attrs;
 233
 234         /* Unfudge the mode bits */
 235         attr->ia_mode &= ~S_IFMT;
 236         if (!(attr->ia_valid & ATTR_MODE)) {
 237                 attr->ia_valid |= ATTR_MODE;
 238                 attr->ia_mode = S_IFREG;
 239         } else {
 240                 attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
 241         }
 242
 243         /* Now create the file and set attributes */
 244         nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
 245                                 attr, newfhp,
 246                                 argp->createmode, (u32 *)argp->verf, NULL, NULL);
 247
 248         RETURN_STATUS(nfserr);
 249 }
 250
 251 /*
 252  * Make directory. This operation is not idempotent.
 253  */
 254 static __be32
 255 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 256 {
 257         struct nfsd3_createargs *argp = rqstp->rq_argp;
 258         struct nfsd3_diropres *resp = rqstp->rq_resp;
 259         __be32  nfserr;
 260
 261         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 262                                 SVCFH_fmt(&argp->fh),
 263                                 argp->len,
 264                                 argp->name);
 265
 266         argp->attrs.ia_valid &= ~ATTR_SIZE;
 267         fh_copy(&resp->dirfh, &argp->fh);
 268         fh_init(&resp->fh, NFS3_FHSIZE);
 269         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 270                                     &argp->attrs, S_IFDIR, 0, &resp->fh);
 271         fh_unlock(&resp->dirfh);
 272         RETURN_STATUS(nfserr);
 273 }
 274
 275 static __be32
 276 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 277 {
 278         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 279         struct nfsd3_diropres *resp = rqstp->rq_resp;
 280         __be32  nfserr;
 281
 282         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 283                                 SVCFH_fmt(&argp->ffh),
 284                                 argp->flen, argp->fname,
 285                                 argp->tlen, argp->tname);
 286
 287         fh_copy(&resp->dirfh, &argp->ffh);
 288         fh_init(&resp->fh, NFS3_FHSIZE);
 289         nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
 290                                                    argp->tname, &resp->fh);
 291         RETURN_STATUS(nfserr);
 292 }
 293
 294 /*
 295  * Make socket/fifo/device.
 296  */
 297 static __be32
 298 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 299 {
 300         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 301         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 302         __be32  nfserr;
 303         int type;
 304         dev_t   rdev = 0;
 305
 306         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 307                                 SVCFH_fmt(&argp->fh),
 308                                 argp->len,
 309                                 argp->name);
 310
 311         fh_copy(&resp->dirfh, &argp->fh);
 312         fh_init(&resp->fh, NFS3_FHSIZE);
 313
 314         if (argp->ftype == 0 || argp->ftype >= NF3BAD)
 315                 RETURN_STATUS(nfserr_inval);
 316         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 317                 rdev = MKDEV(argp->major, argp->minor);
 318                 if (MAJOR(rdev) != argp->major ||
 319                     MINOR(rdev) != argp->minor)
 320                         RETURN_STATUS(nfserr_inval);
 321         } else
 322                 if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
 323                         RETURN_STATUS(nfserr_inval);
 324
 325         type = nfs3_ftypes[argp->ftype];
 326         nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 327                                     &argp->attrs, type, rdev, &resp->fh);
 328         fh_unlock(&resp->dirfh);
 329         RETURN_STATUS(nfserr);
 330 }
 331
 332 /*
 333  * Remove file/fifo/socket etc.
 334  */
 335 static __be32
 336 nfsd3_proc_remove(struct svc_rqst *rqstp)
 337 {
 338         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 339         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 340         __be32  nfserr;
 341
 342         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 343                                 SVCFH_fmt(&argp->fh),
 344                                 argp->len,
 345                                 argp->name);
 346
 347         /* Unlink. -S_IFDIR means file must not be a directory */
 348         fh_copy(&resp->fh, &argp->fh);
 349         nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
 350         fh_unlock(&resp->fh);
 351         RETURN_STATUS(nfserr);
 352 }
 353
 354 /*
 355  * Remove a directory
 356  */
 357 static __be32
 358 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 359 {
 360         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 361         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 362         __be32  nfserr;
 363
 364         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 365                                 SVCFH_fmt(&argp->fh),
 366                                 argp->len,
 367                                 argp->name);
 368
 369         fh_copy(&resp->fh, &argp->fh);
 370         nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
 371         fh_unlock(&resp->fh);
 372         RETURN_STATUS(nfserr);
 373 }
 374
 375 static __be32
 376 nfsd3_proc_rename(struct svc_rqst *rqstp)
 377 {
 378         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 379         struct nfsd3_renameres *resp = rqstp->rq_resp;
 380         __be32  nfserr;
 381
 382         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 383                                 SVCFH_fmt(&argp->ffh),
 384                                 argp->flen,
 385                                 argp->fname);
 386         dprintk("nfsd: -> %s %.*s\n",
 387                                 SVCFH_fmt(&argp->tfh),
 388                                 argp->tlen,
 389                                 argp->tname);
 390
 391         fh_copy(&resp->ffh, &argp->ffh);
 392         fh_copy(&resp->tfh, &argp->tfh);
 393         nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 394                                     &resp->tfh, argp->tname, argp->tlen);
 395         RETURN_STATUS(nfserr);
 396 }
 397
 398 static __be32
 399 nfsd3_proc_link(struct svc_rqst *rqstp)
 400 {
 401         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 402         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 403         __be32  nfserr;
 404
 405         dprintk("nfsd: LINK(3)     %s ->\n",
 406                                 SVCFH_fmt(&argp->ffh));
 407         dprintk("nfsd:   -> %s %.*s\n",
 408                                 SVCFH_fmt(&argp->tfh),
 409                                 argp->tlen,
 410                                 argp->tname);
 411
 412         fh_copy(&resp->fh,  &argp->ffh);
 413         fh_copy(&resp->tfh, &argp->tfh);
 414         nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 415                                   &resp->fh);
 416         RETURN_STATUS(nfserr);
 417 }
 418
 419 /*
 420  * Read a portion of a directory.
 421  */
 422 static __be32
 423 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 424 {
 425         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 426         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 427         __be32          nfserr;
 428         int             count;
 429
 430         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 431                                 SVCFH_fmt(&argp->fh),
 432                                 argp->count, (u32) argp->cookie);
 433
 434         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 435          * client read size */
 436         count = (argp->count >> 2) - 2;
 437
 438         /* Read directory and encode entries on the fly */
 439         fh_copy(&resp->fh, &argp->fh);
 440
 441         resp->buflen = count;
 442         resp->common.err = nfs_ok;
 443         resp->buffer = argp->buffer;
 444         resp->rqstp = rqstp;
 445         nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
 446                                         &resp->common, nfs3svc_encode_entry);
 447         memcpy(resp->verf, argp->verf, 8);
 448         resp->count = resp->buffer - argp->buffer;
 449         if (resp->offset)
 450                 xdr_encode_hyper(resp->offset, argp->cookie);
 451
 452         RETURN_STATUS(nfserr);
 453 }
 454
 455 /*
 456  * Read a portion of a directory, including file handles and attrs.
 457  * For now, we choose to ignore the dircount parameter.
 458  */
 459 static __be32
 460 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 461 {
 462         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 463         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 464         __be32  nfserr;
 465         int     count = 0;
 466         loff_t  offset;
 467         struct page **p;
 468         caddr_t page_addr = NULL;
 469
 470         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 471                                 SVCFH_fmt(&argp->fh),
 472                                 argp->count, (u32) argp->cookie);
 473
 474         /* Convert byte count to number of words (i.e. >> 2),
 475          * and reserve room for the NULL ptr & eof flag (-2 words) */
 476         resp->count = (argp->count >> 2) - 2;
 477
 478         /* Read directory and encode entries on the fly */
 479         fh_copy(&resp->fh, &argp->fh);
 480
 481         resp->common.err = nfs_ok;
 482         resp->buffer = argp->buffer;
 483         resp->buflen = resp->count;
 484         resp->rqstp = rqstp;
 485         offset = argp->cookie;
 486
 487         nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 488         if (nfserr)
 489                 RETURN_STATUS(nfserr);
 490
 491         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
 492                 RETURN_STATUS(nfserr_notsupp);
 493
 494         nfserr = nfsd_readdir(rqstp, &resp->fh,
 495                                      &offset,
 496                                      &resp->common,
 497                                      nfs3svc_encode_entry_plus);
 498         memcpy(resp->verf, argp->verf, 8);
 499         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 500                 page_addr = page_address(*p);
 501
 502                 if (((caddr_t)resp->buffer >= page_addr) &&
 503                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 504                         count += (caddr_t)resp->buffer - page_addr;
 505                         break;
 506                 }
 507                 count += PAGE_SIZE;
 508         }
 509         resp->count = count >> 2;
 510         if (resp->offset) {
 511                 if (unlikely(resp->offset1)) {
 512                         /* we ended up with offset on a page boundary */
 513                         *resp->offset = htonl(offset >> 32);
 514                         *resp->offset1 = htonl(offset & 0xffffffff);
 515                         resp->offset1 = NULL;
 516                 } else {
 517                         xdr_encode_hyper(resp->offset, offset);
 518                 }
 519         }
 520
 521         RETURN_STATUS(nfserr);
 522 }
 523
 524 /*
 525  * Get file system stats
 526  */
 527 static __be32
 528 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 529 {
 530         struct nfsd_fhandle *argp = rqstp->rq_argp;
 531         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 532         __be32  nfserr;
 533
 534         dprintk("nfsd: FSSTAT(3)   %s\n",
 535                                 SVCFH_fmt(&argp->fh));
 536
 537         nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 538         fh_put(&argp->fh);
 539         RETURN_STATUS(nfserr);
 540 }
 541
 542 /*
 543  * Get file system info
 544  */
 545 static __be32
 546 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 547 {
 548         struct nfsd_fhandle *argp = rqstp->rq_argp;
 549         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 550         __be32  nfserr;
 551         u32     max_blocksize = svc_max_payload(rqstp);
 552
 553         dprintk("nfsd: FSINFO(3)   %s\n",
 554                                 SVCFH_fmt(&argp->fh));
 555
 556         resp->f_rtmax  = max_blocksize;
 557         resp->f_rtpref = max_blocksize;
 558         resp->f_rtmult = PAGE_SIZE;
 559         resp->f_wtmax  = max_blocksize;
 560         resp->f_wtpref = max_blocksize;
 561         resp->f_wtmult = PAGE_SIZE;
 562         resp->f_dtpref = PAGE_SIZE;
 563         resp->f_maxfilesize = ~(u32) 0;
 564         resp->f_properties = NFS3_FSF_DEFAULT;
 565
 566         nfserr = fh_verify(rqstp, &argp->fh, 0,
 567                         NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 568
 569         /* Check special features of the file system. May request
 570          * different read/write sizes for file systems known to have
 571          * problems with large blocks */
 572         if (nfserr == 0) {
 573                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 574
 575                 /* Note that we don't care for remote fs's here */
 576                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 577                         resp->f_properties = NFS3_FSF_BILLYBOY;
 578                 }
 579                 resp->f_maxfilesize = sb->s_maxbytes;
 580         }
 581
 582         fh_put(&argp->fh);
 583         RETURN_STATUS(nfserr);
 584 }
 585
 586 /*
 587  * Get pathconf info for the specified file
 588  */
 589 static __be32
 590 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 591 {
 592         struct nfsd_fhandle *argp = rqstp->rq_argp;
 593         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 594         __be32  nfserr;
 595
 596         dprintk("nfsd: PATHCONF(3) %s\n",
 597                                 SVCFH_fmt(&argp->fh));
 598
 599         /* Set default pathconf */
 600         resp->p_link_max = 255;         /* at least */
 601         resp->p_name_max = 255;         /* at least */
 602         resp->p_no_trunc = 0;
 603         resp->p_chown_restricted = 1;
 604         resp->p_case_insensitive = 0;
 605         resp->p_case_preserving = 1;
 606
 607         nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 608
 609         if (nfserr == 0) {
 610                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 611
 612                 /* Note that we don't care for remote fs's here */
 613                 switch (sb->s_magic) {
 614                 case EXT2_SUPER_MAGIC:
 615                         resp->p_link_max = EXT2_LINK_MAX;
 616                         resp->p_name_max = EXT2_NAME_LEN;
 617                         break;
 618                 case MSDOS_SUPER_MAGIC:
 619                         resp->p_case_insensitive = 1;
 620                         resp->p_case_preserving  = 0;
 621                         break;
 622                 }
 623         }
 624
 625         fh_put(&argp->fh);
 626         RETURN_STATUS(nfserr);
 627 }
 628
 629
 630 /*
 631  * Commit a file (range) to stable storage.
 632  */
 633 static __be32
 634 nfsd3_proc_commit(struct svc_rqst *rqstp)
 635 {
 636         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 637         struct nfsd3_commitres *resp = rqstp->rq_resp;
 638         __be32  nfserr;
 639
 640         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 641                                 SVCFH_fmt(&argp->fh),
 642                                 argp->count,
 643                                 (unsigned long long) argp->offset);
 644
 645         if (argp->offset > NFS_OFFSET_MAX)
 646                 RETURN_STATUS(nfserr_inval);
 647
 648         fh_copy(&resp->fh, &argp->fh);
 649         nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count);
 650
 651         RETURN_STATUS(nfserr);
 652 }
 653
 654
 655 /*
 656  * NFSv3 Server procedures.
 657  * Only the results of non-idempotent operations are cached.
 658  */
 659 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 660 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 661 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 662 #define nfsd3_mkdirargs                 nfsd3_createargs
 663 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 664 #define nfsd3_fhandleargs               nfsd_fhandle
 665 #define nfsd3_fhandleres                nfsd3_attrstat
 666 #define nfsd3_attrstatres               nfsd3_attrstat
 667 #define nfsd3_wccstatres                nfsd3_attrstat
 668 #define nfsd3_createres                 nfsd3_diropres
 669 #define nfsd3_voidres                   nfsd3_voidargs
 670 struct nfsd3_voidargs { int dummy; };
 671
 672 #define ST 1            /* status*/
 673 #define FH 17           /* filehandle with length */
 674 #define AT 21           /* attributes */
 675 #define pAT (1+AT)      /* post attributes - conditional */
 676 #define WC (7+pAT)      /* WCC attributes */
 677
 678 static const struct svc_procedure nfsd_procedures3[22] = {
 679         [NFS3PROC_NULL] = {
 680                 .pc_func = nfsd3_proc_null,
 681                 .pc_encode = nfs3svc_encode_voidres,
 682                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 683                 .pc_ressize = sizeof(struct nfsd3_voidres),
 684                 .pc_cachetype = RC_NOCACHE,
 685                 .pc_xdrressize = ST,
 686         },
 687         [NFS3PROC_GETATTR] = {
 688                 .pc_func = nfsd3_proc_getattr,
 689                 .pc_decode = nfs3svc_decode_fhandleargs,
 690                 .pc_encode = nfs3svc_encode_attrstatres,
 691                 .pc_release = nfs3svc_release_fhandle,
 692                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 693                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 694                 .pc_cachetype = RC_NOCACHE,
 695                 .pc_xdrressize = ST+AT,
 696         },
 697         [NFS3PROC_SETATTR] = {
 698                 .pc_func = nfsd3_proc_setattr,
 699                 .pc_decode = nfs3svc_decode_sattrargs,
 700                 .pc_encode = nfs3svc_encode_wccstatres,
 701                 .pc_release = nfs3svc_release_fhandle,
 702                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 703                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 704                 .pc_cachetype = RC_REPLBUFF,
 705                 .pc_xdrressize = ST+WC,
 706         },
 707         [NFS3PROC_LOOKUP] = {
 708                 .pc_func = nfsd3_proc_lookup,
 709                 .pc_decode = nfs3svc_decode_diropargs,
 710                 .pc_encode = nfs3svc_encode_diropres,
 711                 .pc_release = nfs3svc_release_fhandle2,
 712                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 713                 .pc_ressize = sizeof(struct nfsd3_diropres),
 714                 .pc_cachetype = RC_NOCACHE,
 715                 .pc_xdrressize = ST+FH+pAT+pAT,
 716         },
 717         [NFS3PROC_ACCESS] = {
 718                 .pc_func = nfsd3_proc_access,
 719                 .pc_decode = nfs3svc_decode_accessargs,
 720                 .pc_encode = nfs3svc_encode_accessres,
 721                 .pc_release = nfs3svc_release_fhandle,
 722                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 723                 .pc_ressize = sizeof(struct nfsd3_accessres),
 724                 .pc_cachetype = RC_NOCACHE,
 725                 .pc_xdrressize = ST+pAT+1,
 726         },
 727         [NFS3PROC_READLINK] = {
 728                 .pc_func = nfsd3_proc_readlink,
 729                 .pc_decode = nfs3svc_decode_readlinkargs,
 730                 .pc_encode = nfs3svc_encode_readlinkres,
 731                 .pc_release = nfs3svc_release_fhandle,
 732                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 733                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 734                 .pc_cachetype = RC_NOCACHE,
 735                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 736         },
 737         [NFS3PROC_READ] = {
 738                 .pc_func = nfsd3_proc_read,
 739                 .pc_decode = nfs3svc_decode_readargs,
 740                 .pc_encode = nfs3svc_encode_readres,
 741                 .pc_release = nfs3svc_release_fhandle,
 742                 .pc_argsize = sizeof(struct nfsd3_readargs),
 743                 .pc_ressize = sizeof(struct nfsd3_readres),
 744                 .pc_cachetype = RC_NOCACHE,
 745                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 746         },
 747         [NFS3PROC_WRITE] = {
 748                 .pc_func = nfsd3_proc_write,
 749                 .pc_decode = nfs3svc_decode_writeargs,
 750                 .pc_encode = nfs3svc_encode_writeres,
 751                 .pc_release = nfs3svc_release_fhandle,
 752                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 753                 .pc_ressize = sizeof(struct nfsd3_writeres),
 754                 .pc_cachetype = RC_REPLBUFF,
 755                 .pc_xdrressize = ST+WC+4,
 756         },
 757         [NFS3PROC_CREATE] = {
 758                 .pc_func = nfsd3_proc_create,
 759                 .pc_decode = nfs3svc_decode_createargs,
 760                 .pc_encode = nfs3svc_encode_createres,
 761                 .pc_release = nfs3svc_release_fhandle2,
 762                 .pc_argsize = sizeof(struct nfsd3_createargs),
 763                 .pc_ressize = sizeof(struct nfsd3_createres),
 764                 .pc_cachetype = RC_REPLBUFF,
 765                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 766         },
 767         [NFS3PROC_MKDIR] = {
 768                 .pc_func = nfsd3_proc_mkdir,
 769                 .pc_decode = nfs3svc_decode_mkdirargs,
 770                 .pc_encode = nfs3svc_encode_createres,
 771                 .pc_release = nfs3svc_release_fhandle2,
 772                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 773                 .pc_ressize = sizeof(struct nfsd3_createres),
 774                 .pc_cachetype = RC_REPLBUFF,
 775                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 776         },
 777         [NFS3PROC_SYMLINK] = {
 778                 .pc_func = nfsd3_proc_symlink,
 779                 .pc_decode = nfs3svc_decode_symlinkargs,
 780                 .pc_encode = nfs3svc_encode_createres,
 781                 .pc_release = nfs3svc_release_fhandle2,
 782                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 783                 .pc_ressize = sizeof(struct nfsd3_createres),
 784                 .pc_cachetype = RC_REPLBUFF,
 785                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 786         },
 787         [NFS3PROC_MKNOD] = {
 788                 .pc_func = nfsd3_proc_mknod,
 789                 .pc_decode = nfs3svc_decode_mknodargs,
 790                 .pc_encode = nfs3svc_encode_createres,
 791                 .pc_release = nfs3svc_release_fhandle2,
 792                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 793                 .pc_ressize = sizeof(struct nfsd3_createres),
 794                 .pc_cachetype = RC_REPLBUFF,
 795                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 796         },
 797         [NFS3PROC_REMOVE] = {
 798                 .pc_func = nfsd3_proc_remove,
 799                 .pc_decode = nfs3svc_decode_diropargs,
 800                 .pc_encode = nfs3svc_encode_wccstatres,
 801                 .pc_release = nfs3svc_release_fhandle,
 802                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 803                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 804                 .pc_cachetype = RC_REPLBUFF,
 805                 .pc_xdrressize = ST+WC,
 806         },
 807         [NFS3PROC_RMDIR] = {
 808                 .pc_func = nfsd3_proc_rmdir,
 809                 .pc_decode = nfs3svc_decode_diropargs,
 810                 .pc_encode = nfs3svc_encode_wccstatres,
 811                 .pc_release = nfs3svc_release_fhandle,
 812                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 813                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 814                 .pc_cachetype = RC_REPLBUFF,
 815                 .pc_xdrressize = ST+WC,
 816         },
 817         [NFS3PROC_RENAME] = {
 818                 .pc_func = nfsd3_proc_rename,
 819                 .pc_decode = nfs3svc_decode_renameargs,
 820                 .pc_encode = nfs3svc_encode_renameres,
 821                 .pc_release = nfs3svc_release_fhandle2,
 822                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 823                 .pc_ressize = sizeof(struct nfsd3_renameres),
 824                 .pc_cachetype = RC_REPLBUFF,
 825                 .pc_xdrressize = ST+WC+WC,
 826         },
 827         [NFS3PROC_LINK] = {
 828                 .pc_func = nfsd3_proc_link,
 829                 .pc_decode = nfs3svc_decode_linkargs,
 830                 .pc_encode = nfs3svc_encode_linkres,
 831                 .pc_release = nfs3svc_release_fhandle2,
 832                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 833                 .pc_ressize = sizeof(struct nfsd3_linkres),
 834                 .pc_cachetype = RC_REPLBUFF,
 835                 .pc_xdrressize = ST+pAT+WC,
 836         },
 837         [NFS3PROC_READDIR] = {
 838                 .pc_func = nfsd3_proc_readdir,
 839                 .pc_decode = nfs3svc_decode_readdirargs,
 840                 .pc_encode = nfs3svc_encode_readdirres,
 841                 .pc_release = nfs3svc_release_fhandle,
 842                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 843                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 844                 .pc_cachetype = RC_NOCACHE,
 845         },
 846         [NFS3PROC_READDIRPLUS] = {
 847                 .pc_func = nfsd3_proc_readdirplus,
 848                 .pc_decode = nfs3svc_decode_readdirplusargs,
 849                 .pc_encode = nfs3svc_encode_readdirres,
 850                 .pc_release = nfs3svc_release_fhandle,
 851                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 852                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 853                 .pc_cachetype = RC_NOCACHE,
 854         },
 855         [NFS3PROC_FSSTAT] = {
 856                 .pc_func = nfsd3_proc_fsstat,
 857                 .pc_decode = nfs3svc_decode_fhandleargs,
 858                 .pc_encode = nfs3svc_encode_fsstatres,
 859                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 860                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 861                 .pc_cachetype = RC_NOCACHE,
 862                 .pc_xdrressize = ST+pAT+2*6+1,
 863         },
 864         [NFS3PROC_FSINFO] = {
 865                 .pc_func = nfsd3_proc_fsinfo,
 866                 .pc_decode = nfs3svc_decode_fhandleargs,
 867                 .pc_encode = nfs3svc_encode_fsinfores,
 868                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 869                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 870                 .pc_cachetype = RC_NOCACHE,
 871                 .pc_xdrressize = ST+pAT+12,
 872         },
 873         [NFS3PROC_PATHCONF] = {
 874                 .pc_func = nfsd3_proc_pathconf,
 875                 .pc_decode = nfs3svc_decode_fhandleargs,
 876                 .pc_encode = nfs3svc_encode_pathconfres,
 877                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 878                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 879                 .pc_cachetype = RC_NOCACHE,
 880                 .pc_xdrressize = ST+pAT+6,
 881         },
 882         [NFS3PROC_COMMIT] = {
 883                 .pc_func = nfsd3_proc_commit,
 884                 .pc_decode = nfs3svc_decode_commitargs,
 885                 .pc_encode = nfs3svc_encode_commitres,
 886                 .pc_release = nfs3svc_release_fhandle,
 887                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 888                 .pc_ressize = sizeof(struct nfsd3_commitres),
 889                 .pc_cachetype = RC_NOCACHE,
 890                 .pc_xdrressize = ST+WC+2,
 891         },
 892 };
 893
 894 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 895 const struct svc_version nfsd_version3 = {
 896         .vs_vers        = 3,
 897         .vs_nproc       = 22,
 898         .vs_proc        = nfsd_procedures3,
 899         .vs_dispatch    = nfsd_dispatch,
 900         .vs_count       = nfsd_count3,
 901         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 902 };