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 == 0 || argp->ftype >= NF3BAD) {
 320                 resp->status = nfserr_inval;
 321                 goto out;
 322         }
 323         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 324                 rdev = MKDEV(argp->major, argp->minor);
 325                 if (MAJOR(rdev) != argp->major ||
 326                     MINOR(rdev) != argp->minor) {
 327                         resp->status = nfserr_inval;
 328                         goto out;
 329                 }
 330         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 331                 resp->status = nfserr_inval;
 332                 goto out;
 333         }
 334
 335         type = nfs3_ftypes[argp->ftype];
 336         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 337                                    &argp->attrs, type, rdev, &resp->fh);
 338         fh_unlock(&resp->dirfh);
 339 out:
 340         return rpc_success;
 341 }
 342
 343 /*
 344  * Remove file/fifo/socket etc.
 345  */
 346 static __be32
 347 nfsd3_proc_remove(struct svc_rqst *rqstp)
 348 {
 349         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 350         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 351
 352         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 353                                 SVCFH_fmt(&argp->fh),
 354                                 argp->len,
 355                                 argp->name);
 356
 357         /* Unlink. -S_IFDIR means file must not be a directory */
 358         fh_copy(&resp->fh, &argp->fh);
 359         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 360                                    argp->name, argp->len);
 361         fh_unlock(&resp->fh);
 362         return rpc_success;
 363 }
 364
 365 /*
 366  * Remove a directory
 367  */
 368 static __be32
 369 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 370 {
 371         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 372         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 373
 374         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 375                                 SVCFH_fmt(&argp->fh),
 376                                 argp->len,
 377                                 argp->name);
 378
 379         fh_copy(&resp->fh, &argp->fh);
 380         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 381                                    argp->name, argp->len);
 382         fh_unlock(&resp->fh);
 383         return rpc_success;
 384 }
 385
 386 static __be32
 387 nfsd3_proc_rename(struct svc_rqst *rqstp)
 388 {
 389         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 390         struct nfsd3_renameres *resp = rqstp->rq_resp;
 391
 392         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 393                                 SVCFH_fmt(&argp->ffh),
 394                                 argp->flen,
 395                                 argp->fname);
 396         dprintk("nfsd: -> %s %.*s\n",
 397                                 SVCFH_fmt(&argp->tfh),
 398                                 argp->tlen,
 399                                 argp->tname);
 400
 401         fh_copy(&resp->ffh, &argp->ffh);
 402         fh_copy(&resp->tfh, &argp->tfh);
 403         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 404                                    &resp->tfh, argp->tname, argp->tlen);
 405         return rpc_success;
 406 }
 407
 408 static __be32
 409 nfsd3_proc_link(struct svc_rqst *rqstp)
 410 {
 411         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 412         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 413
 414         dprintk("nfsd: LINK(3)     %s ->\n",
 415                                 SVCFH_fmt(&argp->ffh));
 416         dprintk("nfsd:   -> %s %.*s\n",
 417                                 SVCFH_fmt(&argp->tfh),
 418                                 argp->tlen,
 419                                 argp->tname);
 420
 421         fh_copy(&resp->fh,  &argp->ffh);
 422         fh_copy(&resp->tfh, &argp->tfh);
 423         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 424                                  &resp->fh);
 425         return rpc_success;
 426 }
 427
 428 /*
 429  * Read a portion of a directory.
 430  */
 431 static __be32
 432 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 433 {
 434         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 435         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 436         int             count = 0;
 437         struct page     **p;
 438         caddr_t         page_addr = NULL;
 439
 440         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 441                                 SVCFH_fmt(&argp->fh),
 442                                 argp->count, (u32) argp->cookie);
 443
 444         /* Make sure we've room for the NULL ptr & eof flag, and shrink to
 445          * client read size */
 446         count = (argp->count >> 2) - 2;
 447
 448         /* Read directory and encode entries on the fly */
 449         fh_copy(&resp->fh, &argp->fh);
 450
 451         resp->buflen = count;
 452         resp->common.err = nfs_ok;
 453         resp->buffer = argp->buffer;
 454         resp->rqstp = rqstp;
 455         resp->status = nfsd_readdir(rqstp, &resp->fh, (loff_t *)&argp->cookie,
 456                                     &resp->common, nfs3svc_encode_entry);
 457         memcpy(resp->verf, argp->verf, 8);
 458         count = 0;
 459         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 460                 page_addr = page_address(*p);
 461
 462                 if (((caddr_t)resp->buffer >= page_addr) &&
 463                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 464                         count += (caddr_t)resp->buffer - page_addr;
 465                         break;
 466                 }
 467                 count += PAGE_SIZE;
 468         }
 469         resp->count = count >> 2;
 470         if (resp->offset) {
 471                 loff_t offset = argp->cookie;
 472
 473                 if (unlikely(resp->offset1)) {
 474                         /* we ended up with offset on a page boundary */
 475                         *resp->offset = htonl(offset >> 32);
 476                         *resp->offset1 = htonl(offset & 0xffffffff);
 477                         resp->offset1 = NULL;
 478                 } else {
 479                         xdr_encode_hyper(resp->offset, offset);
 480                 }
 481                 resp->offset = NULL;
 482         }
 483
 484         return rpc_success;
 485 }
 486
 487 /*
 488  * Read a portion of a directory, including file handles and attrs.
 489  * For now, we choose to ignore the dircount parameter.
 490  */
 491 static __be32
 492 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 493 {
 494         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 495         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 496         int     count = 0;
 497         loff_t  offset;
 498         struct page **p;
 499         caddr_t page_addr = NULL;
 500
 501         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 502                                 SVCFH_fmt(&argp->fh),
 503                                 argp->count, (u32) argp->cookie);
 504
 505         /* Convert byte count to number of words (i.e. >> 2),
 506          * and reserve room for the NULL ptr & eof flag (-2 words) */
 507         resp->count = (argp->count >> 2) - 2;
 508
 509         /* Read directory and encode entries on the fly */
 510         fh_copy(&resp->fh, &argp->fh);
 511
 512         resp->common.err = nfs_ok;
 513         resp->buffer = argp->buffer;
 514         resp->buflen = resp->count;
 515         resp->rqstp = rqstp;
 516         offset = argp->cookie;
 517
 518         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 519         if (resp->status != nfs_ok)
 520                 goto out;
 521
 522         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 523                 resp->status = nfserr_notsupp;
 524                 goto out;
 525         }
 526
 527         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 528                                     &resp->common, nfs3svc_encode_entry_plus);
 529         memcpy(resp->verf, argp->verf, 8);
 530         for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
 531                 page_addr = page_address(*p);
 532
 533                 if (((caddr_t)resp->buffer >= page_addr) &&
 534                     ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
 535                         count += (caddr_t)resp->buffer - page_addr;
 536                         break;
 537                 }
 538                 count += PAGE_SIZE;
 539         }
 540         resp->count = count >> 2;
 541         if (resp->offset) {
 542                 if (unlikely(resp->offset1)) {
 543                         /* we ended up with offset on a page boundary */
 544                         *resp->offset = htonl(offset >> 32);
 545                         *resp->offset1 = htonl(offset & 0xffffffff);
 546                         resp->offset1 = NULL;
 547                 } else {
 548                         xdr_encode_hyper(resp->offset, offset);
 549                 }
 550                 resp->offset = NULL;
 551         }
 552
 553 out:
 554         return rpc_success;
 555 }
 556
 557 /*
 558  * Get file system stats
 559  */
 560 static __be32
 561 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 562 {
 563         struct nfsd_fhandle *argp = rqstp->rq_argp;
 564         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 565
 566         dprintk("nfsd: FSSTAT(3)   %s\n",
 567                                 SVCFH_fmt(&argp->fh));
 568
 569         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 570         fh_put(&argp->fh);
 571         return rpc_success;
 572 }
 573
 574 /*
 575  * Get file system info
 576  */
 577 static __be32
 578 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 579 {
 580         struct nfsd_fhandle *argp = rqstp->rq_argp;
 581         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 582         u32     max_blocksize = svc_max_payload(rqstp);
 583
 584         dprintk("nfsd: FSINFO(3)   %s\n",
 585                                 SVCFH_fmt(&argp->fh));
 586
 587         resp->f_rtmax  = max_blocksize;
 588         resp->f_rtpref = max_blocksize;
 589         resp->f_rtmult = PAGE_SIZE;
 590         resp->f_wtmax  = max_blocksize;
 591         resp->f_wtpref = max_blocksize;
 592         resp->f_wtmult = PAGE_SIZE;
 593         resp->f_dtpref = max_blocksize;
 594         resp->f_maxfilesize = ~(u32) 0;
 595         resp->f_properties = NFS3_FSF_DEFAULT;
 596
 597         resp->status = fh_verify(rqstp, &argp->fh, 0,
 598                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 599
 600         /* Check special features of the file system. May request
 601          * different read/write sizes for file systems known to have
 602          * problems with large blocks */
 603         if (resp->status == nfs_ok) {
 604                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 605
 606                 /* Note that we don't care for remote fs's here */
 607                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 608                         resp->f_properties = NFS3_FSF_BILLYBOY;
 609                 }
 610                 resp->f_maxfilesize = sb->s_maxbytes;
 611         }
 612
 613         fh_put(&argp->fh);
 614         return rpc_success;
 615 }
 616
 617 /*
 618  * Get pathconf info for the specified file
 619  */
 620 static __be32
 621 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 622 {
 623         struct nfsd_fhandle *argp = rqstp->rq_argp;
 624         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 625
 626         dprintk("nfsd: PATHCONF(3) %s\n",
 627                                 SVCFH_fmt(&argp->fh));
 628
 629         /* Set default pathconf */
 630         resp->p_link_max = 255;         /* at least */
 631         resp->p_name_max = 255;         /* at least */
 632         resp->p_no_trunc = 0;
 633         resp->p_chown_restricted = 1;
 634         resp->p_case_insensitive = 0;
 635         resp->p_case_preserving = 1;
 636
 637         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 638
 639         if (resp->status == nfs_ok) {
 640                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 641
 642                 /* Note that we don't care for remote fs's here */
 643                 switch (sb->s_magic) {
 644                 case EXT2_SUPER_MAGIC:
 645                         resp->p_link_max = EXT2_LINK_MAX;
 646                         resp->p_name_max = EXT2_NAME_LEN;
 647                         break;
 648                 case MSDOS_SUPER_MAGIC:
 649                         resp->p_case_insensitive = 1;
 650                         resp->p_case_preserving  = 0;
 651                         break;
 652                 }
 653         }
 654
 655         fh_put(&argp->fh);
 656         return rpc_success;
 657 }
 658
 659 /*
 660  * Commit a file (range) to stable storage.
 661  */
 662 static __be32
 663 nfsd3_proc_commit(struct svc_rqst *rqstp)
 664 {
 665         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 666         struct nfsd3_commitres *resp = rqstp->rq_resp;
 667
 668         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 669                                 SVCFH_fmt(&argp->fh),
 670                                 argp->count,
 671                                 (unsigned long long) argp->offset);
 672
 673         if (argp->offset > NFS_OFFSET_MAX) {
 674                 resp->status = nfserr_inval;
 675                 goto out;
 676         }
 677
 678         fh_copy(&resp->fh, &argp->fh);
 679         resp->status = nfsd_commit(rqstp, &resp->fh, argp->offset,
 680                                    argp->count, resp->verf);
 681 out:
 682         return rpc_success;
 683 }
 684
 685
 686 /*
 687  * NFSv3 Server procedures.
 688  * Only the results of non-idempotent operations are cached.
 689  */
 690 #define nfs3svc_decode_fhandleargs      nfs3svc_decode_fhandle
 691 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 692 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 693 #define nfsd3_mkdirargs                 nfsd3_createargs
 694 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 695 #define nfsd3_fhandleargs               nfsd_fhandle
 696 #define nfsd3_fhandleres                nfsd3_attrstat
 697 #define nfsd3_attrstatres               nfsd3_attrstat
 698 #define nfsd3_wccstatres                nfsd3_attrstat
 699 #define nfsd3_createres                 nfsd3_diropres
 700 #define nfsd3_voidres                   nfsd3_voidargs
 701 struct nfsd3_voidargs { int dummy; };
 702
 703 #define ST 1            /* status*/
 704 #define FH 17           /* filehandle with length */
 705 #define AT 21           /* attributes */
 706 #define pAT (1+AT)      /* post attributes - conditional */
 707 #define WC (7+pAT)      /* WCC attributes */
 708
 709 static const struct svc_procedure nfsd_procedures3[22] = {
 710         [NFS3PROC_NULL] = {
 711                 .pc_func = nfsd3_proc_null,
 712                 .pc_decode = nfs3svc_decode_voidarg,
 713                 .pc_encode = nfs3svc_encode_voidres,
 714                 .pc_argsize = sizeof(struct nfsd3_voidargs),
 715                 .pc_ressize = sizeof(struct nfsd3_voidres),
 716                 .pc_cachetype = RC_NOCACHE,
 717                 .pc_xdrressize = ST,
 718         },
 719         [NFS3PROC_GETATTR] = {
 720                 .pc_func = nfsd3_proc_getattr,
 721                 .pc_decode = nfs3svc_decode_fhandleargs,
 722                 .pc_encode = nfs3svc_encode_attrstatres,
 723                 .pc_release = nfs3svc_release_fhandle,
 724                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 725                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 726                 .pc_cachetype = RC_NOCACHE,
 727                 .pc_xdrressize = ST+AT,
 728         },
 729         [NFS3PROC_SETATTR] = {
 730                 .pc_func = nfsd3_proc_setattr,
 731                 .pc_decode = nfs3svc_decode_sattrargs,
 732                 .pc_encode = nfs3svc_encode_wccstatres,
 733                 .pc_release = nfs3svc_release_fhandle,
 734                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 735                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 736                 .pc_cachetype = RC_REPLBUFF,
 737                 .pc_xdrressize = ST+WC,
 738         },
 739         [NFS3PROC_LOOKUP] = {
 740                 .pc_func = nfsd3_proc_lookup,
 741                 .pc_decode = nfs3svc_decode_diropargs,
 742                 .pc_encode = nfs3svc_encode_diropres,
 743                 .pc_release = nfs3svc_release_fhandle2,
 744                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 745                 .pc_ressize = sizeof(struct nfsd3_diropres),
 746                 .pc_cachetype = RC_NOCACHE,
 747                 .pc_xdrressize = ST+FH+pAT+pAT,
 748         },
 749         [NFS3PROC_ACCESS] = {
 750                 .pc_func = nfsd3_proc_access,
 751                 .pc_decode = nfs3svc_decode_accessargs,
 752                 .pc_encode = nfs3svc_encode_accessres,
 753                 .pc_release = nfs3svc_release_fhandle,
 754                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 755                 .pc_ressize = sizeof(struct nfsd3_accessres),
 756                 .pc_cachetype = RC_NOCACHE,
 757                 .pc_xdrressize = ST+pAT+1,
 758         },
 759         [NFS3PROC_READLINK] = {
 760                 .pc_func = nfsd3_proc_readlink,
 761                 .pc_decode = nfs3svc_decode_readlinkargs,
 762                 .pc_encode = nfs3svc_encode_readlinkres,
 763                 .pc_release = nfs3svc_release_fhandle,
 764                 .pc_argsize = sizeof(struct nfsd3_readlinkargs),
 765                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 766                 .pc_cachetype = RC_NOCACHE,
 767                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 768         },
 769         [NFS3PROC_READ] = {
 770                 .pc_func = nfsd3_proc_read,
 771                 .pc_decode = nfs3svc_decode_readargs,
 772                 .pc_encode = nfs3svc_encode_readres,
 773                 .pc_release = nfs3svc_release_fhandle,
 774                 .pc_argsize = sizeof(struct nfsd3_readargs),
 775                 .pc_ressize = sizeof(struct nfsd3_readres),
 776                 .pc_cachetype = RC_NOCACHE,
 777                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 778         },
 779         [NFS3PROC_WRITE] = {
 780                 .pc_func = nfsd3_proc_write,
 781                 .pc_decode = nfs3svc_decode_writeargs,
 782                 .pc_encode = nfs3svc_encode_writeres,
 783                 .pc_release = nfs3svc_release_fhandle,
 784                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 785                 .pc_ressize = sizeof(struct nfsd3_writeres),
 786                 .pc_cachetype = RC_REPLBUFF,
 787                 .pc_xdrressize = ST+WC+4,
 788         },
 789         [NFS3PROC_CREATE] = {
 790                 .pc_func = nfsd3_proc_create,
 791                 .pc_decode = nfs3svc_decode_createargs,
 792                 .pc_encode = nfs3svc_encode_createres,
 793                 .pc_release = nfs3svc_release_fhandle2,
 794                 .pc_argsize = sizeof(struct nfsd3_createargs),
 795                 .pc_ressize = sizeof(struct nfsd3_createres),
 796                 .pc_cachetype = RC_REPLBUFF,
 797                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 798         },
 799         [NFS3PROC_MKDIR] = {
 800                 .pc_func = nfsd3_proc_mkdir,
 801                 .pc_decode = nfs3svc_decode_mkdirargs,
 802                 .pc_encode = nfs3svc_encode_createres,
 803                 .pc_release = nfs3svc_release_fhandle2,
 804                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 805                 .pc_ressize = sizeof(struct nfsd3_createres),
 806                 .pc_cachetype = RC_REPLBUFF,
 807                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 808         },
 809         [NFS3PROC_SYMLINK] = {
 810                 .pc_func = nfsd3_proc_symlink,
 811                 .pc_decode = nfs3svc_decode_symlinkargs,
 812                 .pc_encode = nfs3svc_encode_createres,
 813                 .pc_release = nfs3svc_release_fhandle2,
 814                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 815                 .pc_ressize = sizeof(struct nfsd3_createres),
 816                 .pc_cachetype = RC_REPLBUFF,
 817                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 818         },
 819         [NFS3PROC_MKNOD] = {
 820                 .pc_func = nfsd3_proc_mknod,
 821                 .pc_decode = nfs3svc_decode_mknodargs,
 822                 .pc_encode = nfs3svc_encode_createres,
 823                 .pc_release = nfs3svc_release_fhandle2,
 824                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 825                 .pc_ressize = sizeof(struct nfsd3_createres),
 826                 .pc_cachetype = RC_REPLBUFF,
 827                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 828         },
 829         [NFS3PROC_REMOVE] = {
 830                 .pc_func = nfsd3_proc_remove,
 831                 .pc_decode = nfs3svc_decode_diropargs,
 832                 .pc_encode = nfs3svc_encode_wccstatres,
 833                 .pc_release = nfs3svc_release_fhandle,
 834                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 835                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 836                 .pc_cachetype = RC_REPLBUFF,
 837                 .pc_xdrressize = ST+WC,
 838         },
 839         [NFS3PROC_RMDIR] = {
 840                 .pc_func = nfsd3_proc_rmdir,
 841                 .pc_decode = nfs3svc_decode_diropargs,
 842                 .pc_encode = nfs3svc_encode_wccstatres,
 843                 .pc_release = nfs3svc_release_fhandle,
 844                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 845                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 846                 .pc_cachetype = RC_REPLBUFF,
 847                 .pc_xdrressize = ST+WC,
 848         },
 849         [NFS3PROC_RENAME] = {
 850                 .pc_func = nfsd3_proc_rename,
 851                 .pc_decode = nfs3svc_decode_renameargs,
 852                 .pc_encode = nfs3svc_encode_renameres,
 853                 .pc_release = nfs3svc_release_fhandle2,
 854                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 855                 .pc_ressize = sizeof(struct nfsd3_renameres),
 856                 .pc_cachetype = RC_REPLBUFF,
 857                 .pc_xdrressize = ST+WC+WC,
 858         },
 859         [NFS3PROC_LINK] = {
 860                 .pc_func = nfsd3_proc_link,
 861                 .pc_decode = nfs3svc_decode_linkargs,
 862                 .pc_encode = nfs3svc_encode_linkres,
 863                 .pc_release = nfs3svc_release_fhandle2,
 864                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 865                 .pc_ressize = sizeof(struct nfsd3_linkres),
 866                 .pc_cachetype = RC_REPLBUFF,
 867                 .pc_xdrressize = ST+pAT+WC,
 868         },
 869         [NFS3PROC_READDIR] = {
 870                 .pc_func = nfsd3_proc_readdir,
 871                 .pc_decode = nfs3svc_decode_readdirargs,
 872                 .pc_encode = nfs3svc_encode_readdirres,
 873                 .pc_release = nfs3svc_release_fhandle,
 874                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 875                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 876                 .pc_cachetype = RC_NOCACHE,
 877         },
 878         [NFS3PROC_READDIRPLUS] = {
 879                 .pc_func = nfsd3_proc_readdirplus,
 880                 .pc_decode = nfs3svc_decode_readdirplusargs,
 881                 .pc_encode = nfs3svc_encode_readdirres,
 882                 .pc_release = nfs3svc_release_fhandle,
 883                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
 884                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 885                 .pc_cachetype = RC_NOCACHE,
 886         },
 887         [NFS3PROC_FSSTAT] = {
 888                 .pc_func = nfsd3_proc_fsstat,
 889                 .pc_decode = nfs3svc_decode_fhandleargs,
 890                 .pc_encode = nfs3svc_encode_fsstatres,
 891                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 892                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
 893                 .pc_cachetype = RC_NOCACHE,
 894                 .pc_xdrressize = ST+pAT+2*6+1,
 895         },
 896         [NFS3PROC_FSINFO] = {
 897                 .pc_func = nfsd3_proc_fsinfo,
 898                 .pc_decode = nfs3svc_decode_fhandleargs,
 899                 .pc_encode = nfs3svc_encode_fsinfores,
 900                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 901                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
 902                 .pc_cachetype = RC_NOCACHE,
 903                 .pc_xdrressize = ST+pAT+12,
 904         },
 905         [NFS3PROC_PATHCONF] = {
 906                 .pc_func = nfsd3_proc_pathconf,
 907                 .pc_decode = nfs3svc_decode_fhandleargs,
 908                 .pc_encode = nfs3svc_encode_pathconfres,
 909                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
 910                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
 911                 .pc_cachetype = RC_NOCACHE,
 912                 .pc_xdrressize = ST+pAT+6,
 913         },
 914         [NFS3PROC_COMMIT] = {
 915                 .pc_func = nfsd3_proc_commit,
 916                 .pc_decode = nfs3svc_decode_commitargs,
 917                 .pc_encode = nfs3svc_encode_commitres,
 918                 .pc_release = nfs3svc_release_fhandle,
 919                 .pc_argsize = sizeof(struct nfsd3_commitargs),
 920                 .pc_ressize = sizeof(struct nfsd3_commitres),
 921                 .pc_cachetype = RC_NOCACHE,
 922                 .pc_xdrressize = ST+WC+2,
 923         },
 924 };
 925
 926 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
 927 const struct svc_version nfsd_version3 = {
 928         .vs_vers        = 3,
 929         .vs_nproc       = 22,
 930         .vs_proc        = nfsd_procedures3,
 931         .vs_dispatch    = nfsd_dispatch,
 932         .vs_count       = nfsd_count3,
 933         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 934 };