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 #include <linux/namei.h>
  12
  13 #include "cache.h"
  14 #include "xdr3.h"
  15 #include "vfs.h"
  16 #include "filecache.h"
  17
  18 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  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 rpc_success;
  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
  49         dprintk("nfsd: GETATTR(3)  %s\n",
  50                 SVCFH_fmt(&argp->fh));
  51
  52         fh_copy(&resp->fh, &argp->fh);
  53         resp->status = fh_verify(rqstp, &resp->fh, 0,
  54                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
  55         if (resp->status != nfs_ok)
  56                 goto out;
  57
  58         resp->status = fh_getattr(&resp->fh, &resp->stat);
  59 out:
  60         return rpc_success;
  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         struct nfsd_attrs attrs = {
  72                 .na_iattr       = &argp->attrs,
  73         };
  74
  75         dprintk("nfsd: SETATTR(3)  %s\n",
  76                                 SVCFH_fmt(&argp->fh));
  77
  78         fh_copy(&resp->fh, &argp->fh);
  79         resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs,
  80                                     argp->check_guard, argp->guardtime);
  81         return rpc_success;
  82 }
  83
  84 /*
  85  * Look up a path name component
  86  */
  87 static __be32
  88 nfsd3_proc_lookup(struct svc_rqst *rqstp)
  89 {
  90         struct nfsd3_diropargs *argp = rqstp->rq_argp;
  91         struct nfsd3_diropres  *resp = rqstp->rq_resp;
  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         resp->status = nfsd_lookup(rqstp, &resp->dirfh,
 102                                    argp->name, argp->len,
 103                                    &resp->fh);
 104         return rpc_success;
 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
 116         dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
 117                                 SVCFH_fmt(&argp->fh),
 118                                 argp->access);
 119
 120         fh_copy(&resp->fh, &argp->fh);
 121         resp->access = argp->access;
 122         resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 123         return rpc_success;
 124 }
 125
 126 /*
 127  * Read a symlink.
 128  */
 129 static __be32
 130 nfsd3_proc_readlink(struct svc_rqst *rqstp)
 131 {
 132         struct nfsd_fhandle *argp = rqstp->rq_argp;
 133         struct nfsd3_readlinkres *resp = rqstp->rq_resp;
 134
 135         dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
 136
 137         /* Read the symlink. */
 138         fh_copy(&resp->fh, &argp->fh);
 139         resp->len = NFS3_MAXPATHLEN;
 140         resp->pages = rqstp->rq_next_page++;
 141         resp->status = nfsd_readlink(rqstp, &resp->fh,
 142                                      page_address(*resp->pages), &resp->len);
 143         return rpc_success;
 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
 155         dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
 156                                 SVCFH_fmt(&argp->fh),
 157                                 (unsigned long) argp->count,
 158                                 (unsigned long long) argp->offset);
 159
 160         argp->count = min_t(u32, argp->count, svc_max_payload(rqstp));
 161         argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
 162         if (argp->offset > (u64)OFFSET_MAX)
 163                 argp->offset = (u64)OFFSET_MAX;
 164         if (argp->offset + argp->count > (u64)OFFSET_MAX)
 165                 argp->count = (u64)OFFSET_MAX - argp->offset;
 166
 167         resp->pages = rqstp->rq_next_page;
 168
 169         /* Obtain buffer pointer for payload.
 170          * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
 171          * + 1 (xdr opaque byte count) = 26
 172          */
 173         resp->count = argp->count;
 174         svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3) << 2) +
 175                          resp->count + 4);
 176
 177         fh_copy(&resp->fh, &argp->fh);
 178         resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
 179                                  &resp->count, &resp->eof);
 180         return rpc_success;
 181 }
 182
 183 /*
 184  * Write data to a file
 185  */
 186 static __be32
 187 nfsd3_proc_write(struct svc_rqst *rqstp)
 188 {
 189         struct nfsd3_writeargs *argp = rqstp->rq_argp;
 190         struct nfsd3_writeres *resp = rqstp->rq_resp;
 191         unsigned long cnt = argp->len;
 192         unsigned int nvecs;
 193
 194         dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
 195                                 SVCFH_fmt(&argp->fh),
 196                                 argp->len,
 197                                 (unsigned long long) argp->offset,
 198                                 argp->stable ? " stable" : "");
 199
 200         resp->status = nfserr_fbig;
 201         if (argp->offset > (u64)OFFSET_MAX ||
 202             argp->offset + argp->len > (u64)OFFSET_MAX)
 203                 return rpc_success;
 204
 205         fh_copy(&resp->fh, &argp->fh);
 206         resp->committed = argp->stable;
 207         nvecs = svc_fill_write_vector(rqstp, &argp->payload);
 208
 209         resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
 210                                   rqstp->rq_vec, nvecs, &cnt,
 211                                   resp->committed, resp->verf);
 212         resp->count = cnt;
 213         return rpc_success;
 214 }
 215
 216 /*
 217  * Implement NFSv3's unchecked, guarded, and exclusive CREATE
 218  * semantics for regular files. Except for the created file,
 219  * this operation is stateless on the server.
 220  *
 221  * Upon return, caller must release @fhp and @resfhp.
 222  */
 223 static __be32
 224 nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
 225                   struct svc_fh *resfhp, struct nfsd3_createargs *argp)
 226 {
 227         struct iattr *iap = &argp->attrs;
 228         struct dentry *parent, *child;
 229         struct nfsd_attrs attrs = {
 230                 .na_iattr       = iap,
 231         };
 232         __u32 v_mtime, v_atime;
 233         struct inode *inode;
 234         __be32 status;
 235         int host_err;
 236
 237         if (isdotent(argp->name, argp->len))
 238                 return nfserr_exist;
 239         if (!(iap->ia_valid & ATTR_MODE))
 240                 iap->ia_mode = 0;
 241
 242         status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
 243         if (status != nfs_ok)
 244                 return status;
 245
 246         parent = fhp->fh_dentry;
 247         inode = d_inode(parent);
 248
 249         host_err = fh_want_write(fhp);
 250         if (host_err)
 251                 return nfserrno(host_err);
 252
 253         inode_lock_nested(inode, I_MUTEX_PARENT);
 254
 255         child = lookup_one_len(argp->name, parent, argp->len);
 256         if (IS_ERR(child)) {
 257                 status = nfserrno(PTR_ERR(child));
 258                 goto out;
 259         }
 260
 261         if (d_really_is_negative(child)) {
 262                 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
 263                 if (status != nfs_ok)
 264                         goto out;
 265         }
 266
 267         status = fh_compose(resfhp, fhp->fh_export, child, fhp);
 268         if (status != nfs_ok)
 269                 goto out;
 270
 271         v_mtime = 0;
 272         v_atime = 0;
 273         if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
 274                 u32 *verifier = (u32 *)argp->verf;
 275
 276                 /*
 277                  * Solaris 7 gets confused (bugid 4218508) if these have
 278                  * the high bit set, as do xfs filesystems without the
 279                  * "bigtime" feature. So just clear the high bits.
 280                  */
 281                 v_mtime = verifier[0] & 0x7fffffff;
 282                 v_atime = verifier[1] & 0x7fffffff;
 283         }
 284
 285         if (d_really_is_positive(child)) {
 286                 status = nfs_ok;
 287
 288                 switch (argp->createmode) {
 289                 case NFS3_CREATE_UNCHECKED:
 290                         if (!d_is_reg(child))
 291                                 break;
 292                         iap->ia_valid &= ATTR_SIZE;
 293                         goto set_attr;
 294                 case NFS3_CREATE_GUARDED:
 295                         status = nfserr_exist;
 296                         break;
 297                 case NFS3_CREATE_EXCLUSIVE:
 298                         if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
 299                             inode_get_atime_sec(d_inode(child)) == v_atime &&
 300                             d_inode(child)->i_size == 0) {
 301                                 break;
 302                         }
 303                         status = nfserr_exist;
 304                 }
 305                 goto out;
 306         }
 307
 308         if (!IS_POSIXACL(inode))
 309                 iap->ia_mode &= ~current_umask();
 310
 311         status = fh_fill_pre_attrs(fhp);
 312         if (status != nfs_ok)
 313                 goto out;
 314         host_err = vfs_create(&nop_mnt_idmap, inode, child, iap->ia_mode, true);
 315         if (host_err < 0) {
 316                 status = nfserrno(host_err);
 317                 goto out;
 318         }
 319         fh_fill_post_attrs(fhp);
 320
 321         /* A newly created file already has a file size of zero. */
 322         if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
 323                 iap->ia_valid &= ~ATTR_SIZE;
 324         if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
 325                 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
 326                                 ATTR_MTIME_SET | ATTR_ATIME_SET;
 327                 iap->ia_mtime.tv_sec = v_mtime;
 328                 iap->ia_atime.tv_sec = v_atime;
 329                 iap->ia_mtime.tv_nsec = 0;
 330                 iap->ia_atime.tv_nsec = 0;
 331         }
 332
 333 set_attr:
 334         status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
 335
 336 out:
 337         inode_unlock(inode);
 338         if (child && !IS_ERR(child))
 339                 dput(child);
 340         fh_drop_write(fhp);
 341         return status;
 342 }
 343
 344 static __be32
 345 nfsd3_proc_create(struct svc_rqst *rqstp)
 346 {
 347         struct nfsd3_createargs *argp = rqstp->rq_argp;
 348         struct nfsd3_diropres *resp = rqstp->rq_resp;
 349         svc_fh *dirfhp, *newfhp;
 350
 351         dprintk("nfsd: CREATE(3)   %s %.*s\n",
 352                                 SVCFH_fmt(&argp->fh),
 353                                 argp->len,
 354                                 argp->name);
 355
 356         dirfhp = fh_copy(&resp->dirfh, &argp->fh);
 357         newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
 358
 359         resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp);
 360         return rpc_success;
 361 }
 362
 363 /*
 364  * Make directory. This operation is not idempotent.
 365  */
 366 static __be32
 367 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
 368 {
 369         struct nfsd3_createargs *argp = rqstp->rq_argp;
 370         struct nfsd3_diropres *resp = rqstp->rq_resp;
 371         struct nfsd_attrs attrs = {
 372                 .na_iattr       = &argp->attrs,
 373         };
 374
 375         dprintk("nfsd: MKDIR(3)    %s %.*s\n",
 376                                 SVCFH_fmt(&argp->fh),
 377                                 argp->len,
 378                                 argp->name);
 379
 380         argp->attrs.ia_valid &= ~ATTR_SIZE;
 381         fh_copy(&resp->dirfh, &argp->fh);
 382         fh_init(&resp->fh, NFS3_FHSIZE);
 383         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 384                                    &attrs, S_IFDIR, 0, &resp->fh);
 385         return rpc_success;
 386 }
 387
 388 static __be32
 389 nfsd3_proc_symlink(struct svc_rqst *rqstp)
 390 {
 391         struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
 392         struct nfsd3_diropres *resp = rqstp->rq_resp;
 393         struct nfsd_attrs attrs = {
 394                 .na_iattr       = &argp->attrs,
 395         };
 396
 397         if (argp->tlen == 0) {
 398                 resp->status = nfserr_inval;
 399                 goto out;
 400         }
 401         if (argp->tlen > NFS3_MAXPATHLEN) {
 402                 resp->status = nfserr_nametoolong;
 403                 goto out;
 404         }
 405
 406         argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
 407                                                 page_address(rqstp->rq_arg.pages[0]),
 408                                                 argp->tlen);
 409         if (IS_ERR(argp->tname)) {
 410                 resp->status = nfserrno(PTR_ERR(argp->tname));
 411                 goto out;
 412         }
 413
 414         dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
 415                                 SVCFH_fmt(&argp->ffh),
 416                                 argp->flen, argp->fname,
 417                                 argp->tlen, argp->tname);
 418
 419         fh_copy(&resp->dirfh, &argp->ffh);
 420         fh_init(&resp->fh, NFS3_FHSIZE);
 421         resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
 422                                     argp->flen, argp->tname, &attrs, &resp->fh);
 423         kfree(argp->tname);
 424 out:
 425         return rpc_success;
 426 }
 427
 428 /*
 429  * Make socket/fifo/device.
 430  */
 431 static __be32
 432 nfsd3_proc_mknod(struct svc_rqst *rqstp)
 433 {
 434         struct nfsd3_mknodargs *argp = rqstp->rq_argp;
 435         struct nfsd3_diropres  *resp = rqstp->rq_resp;
 436         struct nfsd_attrs attrs = {
 437                 .na_iattr       = &argp->attrs,
 438         };
 439         int type;
 440         dev_t   rdev = 0;
 441
 442         dprintk("nfsd: MKNOD(3)    %s %.*s\n",
 443                                 SVCFH_fmt(&argp->fh),
 444                                 argp->len,
 445                                 argp->name);
 446
 447         fh_copy(&resp->dirfh, &argp->fh);
 448         fh_init(&resp->fh, NFS3_FHSIZE);
 449
 450         if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
 451                 rdev = MKDEV(argp->major, argp->minor);
 452                 if (MAJOR(rdev) != argp->major ||
 453                     MINOR(rdev) != argp->minor) {
 454                         resp->status = nfserr_inval;
 455                         goto out;
 456                 }
 457         } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
 458                 resp->status = nfserr_badtype;
 459                 goto out;
 460         }
 461
 462         type = nfs3_ftypes[argp->ftype];
 463         resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
 464                                    &attrs, type, rdev, &resp->fh);
 465 out:
 466         return rpc_success;
 467 }
 468
 469 /*
 470  * Remove file/fifo/socket etc.
 471  */
 472 static __be32
 473 nfsd3_proc_remove(struct svc_rqst *rqstp)
 474 {
 475         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 476         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 477
 478         dprintk("nfsd: REMOVE(3)   %s %.*s\n",
 479                                 SVCFH_fmt(&argp->fh),
 480                                 argp->len,
 481                                 argp->name);
 482
 483         /* Unlink. -S_IFDIR means file must not be a directory */
 484         fh_copy(&resp->fh, &argp->fh);
 485         resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
 486                                    argp->name, argp->len);
 487         return rpc_success;
 488 }
 489
 490 /*
 491  * Remove a directory
 492  */
 493 static __be32
 494 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
 495 {
 496         struct nfsd3_diropargs *argp = rqstp->rq_argp;
 497         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 498
 499         dprintk("nfsd: RMDIR(3)    %s %.*s\n",
 500                                 SVCFH_fmt(&argp->fh),
 501                                 argp->len,
 502                                 argp->name);
 503
 504         fh_copy(&resp->fh, &argp->fh);
 505         resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
 506                                    argp->name, argp->len);
 507         return rpc_success;
 508 }
 509
 510 static __be32
 511 nfsd3_proc_rename(struct svc_rqst *rqstp)
 512 {
 513         struct nfsd3_renameargs *argp = rqstp->rq_argp;
 514         struct nfsd3_renameres *resp = rqstp->rq_resp;
 515
 516         dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
 517                                 SVCFH_fmt(&argp->ffh),
 518                                 argp->flen,
 519                                 argp->fname);
 520         dprintk("nfsd: -> %s %.*s\n",
 521                                 SVCFH_fmt(&argp->tfh),
 522                                 argp->tlen,
 523                                 argp->tname);
 524
 525         fh_copy(&resp->ffh, &argp->ffh);
 526         fh_copy(&resp->tfh, &argp->tfh);
 527         resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
 528                                    &resp->tfh, argp->tname, argp->tlen);
 529         return rpc_success;
 530 }
 531
 532 static __be32
 533 nfsd3_proc_link(struct svc_rqst *rqstp)
 534 {
 535         struct nfsd3_linkargs *argp = rqstp->rq_argp;
 536         struct nfsd3_linkres  *resp = rqstp->rq_resp;
 537
 538         dprintk("nfsd: LINK(3)     %s ->\n",
 539                                 SVCFH_fmt(&argp->ffh));
 540         dprintk("nfsd:   -> %s %.*s\n",
 541                                 SVCFH_fmt(&argp->tfh),
 542                                 argp->tlen,
 543                                 argp->tname);
 544
 545         fh_copy(&resp->fh,  &argp->ffh);
 546         fh_copy(&resp->tfh, &argp->tfh);
 547         resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
 548                                  &resp->fh);
 549         return rpc_success;
 550 }
 551
 552 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
 553                                      struct nfsd3_readdirres *resp,
 554                                      u32 count)
 555 {
 556         struct xdr_buf *buf = &resp->dirlist;
 557         struct xdr_stream *xdr = &resp->xdr;
 558         unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
 559                                      svc_max_payload(rqstp));
 560
 561         memset(buf, 0, sizeof(*buf));
 562
 563         /* Reserve room for the NULL ptr & eof flag (-2 words) */
 564         buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
 565         buf->buflen -= XDR_UNIT * 2;
 566         buf->pages = rqstp->rq_next_page;
 567         rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
 568
 569         xdr_init_encode_pages(xdr, buf, buf->pages,  NULL);
 570 }
 571
 572 /*
 573  * Read a portion of a directory.
 574  */
 575 static __be32
 576 nfsd3_proc_readdir(struct svc_rqst *rqstp)
 577 {
 578         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 579         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 580         loff_t          offset;
 581
 582         dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
 583                                 SVCFH_fmt(&argp->fh),
 584                                 argp->count, (u32) argp->cookie);
 585
 586         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 587
 588         fh_copy(&resp->fh, &argp->fh);
 589         resp->common.err = nfs_ok;
 590         resp->cookie_offset = 0;
 591         resp->rqstp = rqstp;
 592         offset = argp->cookie;
 593         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 594                                     &resp->common, nfs3svc_encode_entry3);
 595         memcpy(resp->verf, argp->verf, 8);
 596         nfs3svc_encode_cookie3(resp, offset);
 597
 598         /* Recycle only pages that were part of the reply */
 599         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 600
 601         return rpc_success;
 602 }
 603
 604 /*
 605  * Read a portion of a directory, including file handles and attrs.
 606  * For now, we choose to ignore the dircount parameter.
 607  */
 608 static __be32
 609 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
 610 {
 611         struct nfsd3_readdirargs *argp = rqstp->rq_argp;
 612         struct nfsd3_readdirres  *resp = rqstp->rq_resp;
 613         loff_t  offset;
 614
 615         dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
 616                                 SVCFH_fmt(&argp->fh),
 617                                 argp->count, (u32) argp->cookie);
 618
 619         nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
 620
 621         fh_copy(&resp->fh, &argp->fh);
 622         resp->common.err = nfs_ok;
 623         resp->cookie_offset = 0;
 624         resp->rqstp = rqstp;
 625         offset = argp->cookie;
 626
 627         resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
 628         if (resp->status != nfs_ok)
 629                 goto out;
 630
 631         if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
 632                 resp->status = nfserr_notsupp;
 633                 goto out;
 634         }
 635
 636         resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
 637                                     &resp->common, nfs3svc_encode_entryplus3);
 638         memcpy(resp->verf, argp->verf, 8);
 639         nfs3svc_encode_cookie3(resp, offset);
 640
 641         /* Recycle only pages that were part of the reply */
 642         rqstp->rq_next_page = resp->xdr.page_ptr + 1;
 643
 644 out:
 645         return rpc_success;
 646 }
 647
 648 /*
 649  * Get file system stats
 650  */
 651 static __be32
 652 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
 653 {
 654         struct nfsd_fhandle *argp = rqstp->rq_argp;
 655         struct nfsd3_fsstatres *resp = rqstp->rq_resp;
 656
 657         dprintk("nfsd: FSSTAT(3)   %s\n",
 658                                 SVCFH_fmt(&argp->fh));
 659
 660         resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
 661         fh_put(&argp->fh);
 662         return rpc_success;
 663 }
 664
 665 /*
 666  * Get file system info
 667  */
 668 static __be32
 669 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
 670 {
 671         struct nfsd_fhandle *argp = rqstp->rq_argp;
 672         struct nfsd3_fsinfores *resp = rqstp->rq_resp;
 673         u32     max_blocksize = svc_max_payload(rqstp);
 674
 675         dprintk("nfsd: FSINFO(3)   %s\n",
 676                                 SVCFH_fmt(&argp->fh));
 677
 678         resp->f_rtmax  = max_blocksize;
 679         resp->f_rtpref = max_blocksize;
 680         resp->f_rtmult = PAGE_SIZE;
 681         resp->f_wtmax  = max_blocksize;
 682         resp->f_wtpref = max_blocksize;
 683         resp->f_wtmult = PAGE_SIZE;
 684         resp->f_dtpref = max_blocksize;
 685         resp->f_maxfilesize = ~(u32) 0;
 686         resp->f_properties = NFS3_FSF_DEFAULT;
 687
 688         resp->status = fh_verify(rqstp, &argp->fh, 0,
 689                                  NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
 690
 691         /* Check special features of the file system. May request
 692          * different read/write sizes for file systems known to have
 693          * problems with large blocks */
 694         if (resp->status == nfs_ok) {
 695                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 696
 697                 /* Note that we don't care for remote fs's here */
 698                 if (sb->s_magic == MSDOS_SUPER_MAGIC) {
 699                         resp->f_properties = NFS3_FSF_BILLYBOY;
 700                 }
 701                 resp->f_maxfilesize = sb->s_maxbytes;
 702         }
 703
 704         fh_put(&argp->fh);
 705         return rpc_success;
 706 }
 707
 708 /*
 709  * Get pathconf info for the specified file
 710  */
 711 static __be32
 712 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
 713 {
 714         struct nfsd_fhandle *argp = rqstp->rq_argp;
 715         struct nfsd3_pathconfres *resp = rqstp->rq_resp;
 716
 717         dprintk("nfsd: PATHCONF(3) %s\n",
 718                                 SVCFH_fmt(&argp->fh));
 719
 720         /* Set default pathconf */
 721         resp->p_link_max = 255;         /* at least */
 722         resp->p_name_max = 255;         /* at least */
 723         resp->p_no_trunc = 0;
 724         resp->p_chown_restricted = 1;
 725         resp->p_case_insensitive = 0;
 726         resp->p_case_preserving = 1;
 727
 728         resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 729
 730         if (resp->status == nfs_ok) {
 731                 struct super_block *sb = argp->fh.fh_dentry->d_sb;
 732
 733                 /* Note that we don't care for remote fs's here */
 734                 switch (sb->s_magic) {
 735                 case EXT2_SUPER_MAGIC:
 736                         resp->p_link_max = EXT2_LINK_MAX;
 737                         resp->p_name_max = EXT2_NAME_LEN;
 738                         break;
 739                 case MSDOS_SUPER_MAGIC:
 740                         resp->p_case_insensitive = 1;
 741                         resp->p_case_preserving  = 0;
 742                         break;
 743                 }
 744         }
 745
 746         fh_put(&argp->fh);
 747         return rpc_success;
 748 }
 749
 750 /*
 751  * Commit a file (range) to stable storage.
 752  */
 753 static __be32
 754 nfsd3_proc_commit(struct svc_rqst *rqstp)
 755 {
 756         struct nfsd3_commitargs *argp = rqstp->rq_argp;
 757         struct nfsd3_commitres *resp = rqstp->rq_resp;
 758         struct nfsd_file *nf;
 759
 760         dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
 761                                 SVCFH_fmt(&argp->fh),
 762                                 argp->count,
 763                                 (unsigned long long) argp->offset);
 764
 765         fh_copy(&resp->fh, &argp->fh);
 766         resp->status = nfsd_file_acquire_gc(rqstp, &resp->fh, NFSD_MAY_WRITE |
 767                                             NFSD_MAY_NOT_BREAK_LEASE, &nf);
 768         if (resp->status)
 769                 goto out;
 770         resp->status = nfsd_commit(rqstp, &resp->fh, nf, argp->offset,
 771                                    argp->count, resp->verf);
 772         nfsd_file_put(nf);
 773 out:
 774         return rpc_success;
 775 }
 776
 777
 778 /*
 779  * NFSv3 Server procedures.
 780  * Only the results of non-idempotent operations are cached.
 781  */
 782 #define nfs3svc_encode_attrstatres      nfs3svc_encode_attrstat
 783 #define nfs3svc_encode_wccstatres       nfs3svc_encode_wccstat
 784 #define nfsd3_mkdirargs                 nfsd3_createargs
 785 #define nfsd3_readdirplusargs           nfsd3_readdirargs
 786 #define nfsd3_fhandleargs               nfsd_fhandle
 787 #define nfsd3_attrstatres               nfsd3_attrstat
 788 #define nfsd3_wccstatres                nfsd3_attrstat
 789 #define nfsd3_createres                 nfsd3_diropres
 790
 791 #define ST 1            /* status*/
 792 #define FH 17           /* filehandle with length */
 793 #define AT 21           /* attributes */
 794 #define pAT (1+AT)      /* post attributes - conditional */
 795 #define WC (7+pAT)      /* WCC attributes */
 796
 797 static const struct svc_procedure nfsd_procedures3[22] = {
 798         [NFS3PROC_NULL] = {
 799                 .pc_func = nfsd3_proc_null,
 800                 .pc_decode = nfssvc_decode_voidarg,
 801                 .pc_encode = nfssvc_encode_voidres,
 802                 .pc_argsize = sizeof(struct nfsd_voidargs),
 803                 .pc_argzero = sizeof(struct nfsd_voidargs),
 804                 .pc_ressize = sizeof(struct nfsd_voidres),
 805                 .pc_cachetype = RC_NOCACHE,
 806                 .pc_xdrressize = ST,
 807                 .pc_name = "NULL",
 808         },
 809         [NFS3PROC_GETATTR] = {
 810                 .pc_func = nfsd3_proc_getattr,
 811                 .pc_decode = nfs3svc_decode_fhandleargs,
 812                 .pc_encode = nfs3svc_encode_getattrres,
 813                 .pc_release = nfs3svc_release_fhandle,
 814                 .pc_argsize = sizeof(struct nfsd_fhandle),
 815                 .pc_argzero = sizeof(struct nfsd_fhandle),
 816                 .pc_ressize = sizeof(struct nfsd3_attrstatres),
 817                 .pc_cachetype = RC_NOCACHE,
 818                 .pc_xdrressize = ST+AT,
 819                 .pc_name = "GETATTR",
 820         },
 821         [NFS3PROC_SETATTR] = {
 822                 .pc_func = nfsd3_proc_setattr,
 823                 .pc_decode = nfs3svc_decode_sattrargs,
 824                 .pc_encode = nfs3svc_encode_wccstatres,
 825                 .pc_release = nfs3svc_release_fhandle,
 826                 .pc_argsize = sizeof(struct nfsd3_sattrargs),
 827                 .pc_argzero = sizeof(struct nfsd3_sattrargs),
 828                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 829                 .pc_cachetype = RC_REPLBUFF,
 830                 .pc_xdrressize = ST+WC,
 831                 .pc_name = "SETATTR",
 832         },
 833         [NFS3PROC_LOOKUP] = {
 834                 .pc_func = nfsd3_proc_lookup,
 835                 .pc_decode = nfs3svc_decode_diropargs,
 836                 .pc_encode = nfs3svc_encode_lookupres,
 837                 .pc_release = nfs3svc_release_fhandle2,
 838                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 839                 .pc_argzero = sizeof(struct nfsd3_diropargs),
 840                 .pc_ressize = sizeof(struct nfsd3_diropres),
 841                 .pc_cachetype = RC_NOCACHE,
 842                 .pc_xdrressize = ST+FH+pAT+pAT,
 843                 .pc_name = "LOOKUP",
 844         },
 845         [NFS3PROC_ACCESS] = {
 846                 .pc_func = nfsd3_proc_access,
 847                 .pc_decode = nfs3svc_decode_accessargs,
 848                 .pc_encode = nfs3svc_encode_accessres,
 849                 .pc_release = nfs3svc_release_fhandle,
 850                 .pc_argsize = sizeof(struct nfsd3_accessargs),
 851                 .pc_argzero = sizeof(struct nfsd3_accessargs),
 852                 .pc_ressize = sizeof(struct nfsd3_accessres),
 853                 .pc_cachetype = RC_NOCACHE,
 854                 .pc_xdrressize = ST+pAT+1,
 855                 .pc_name = "ACCESS",
 856         },
 857         [NFS3PROC_READLINK] = {
 858                 .pc_func = nfsd3_proc_readlink,
 859                 .pc_decode = nfs3svc_decode_fhandleargs,
 860                 .pc_encode = nfs3svc_encode_readlinkres,
 861                 .pc_release = nfs3svc_release_fhandle,
 862                 .pc_argsize = sizeof(struct nfsd_fhandle),
 863                 .pc_argzero = sizeof(struct nfsd_fhandle),
 864                 .pc_ressize = sizeof(struct nfsd3_readlinkres),
 865                 .pc_cachetype = RC_NOCACHE,
 866                 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
 867                 .pc_name = "READLINK",
 868         },
 869         [NFS3PROC_READ] = {
 870                 .pc_func = nfsd3_proc_read,
 871                 .pc_decode = nfs3svc_decode_readargs,
 872                 .pc_encode = nfs3svc_encode_readres,
 873                 .pc_release = nfs3svc_release_fhandle,
 874                 .pc_argsize = sizeof(struct nfsd3_readargs),
 875                 .pc_argzero = sizeof(struct nfsd3_readargs),
 876                 .pc_ressize = sizeof(struct nfsd3_readres),
 877                 .pc_cachetype = RC_NOCACHE,
 878                 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
 879                 .pc_name = "READ",
 880         },
 881         [NFS3PROC_WRITE] = {
 882                 .pc_func = nfsd3_proc_write,
 883                 .pc_decode = nfs3svc_decode_writeargs,
 884                 .pc_encode = nfs3svc_encode_writeres,
 885                 .pc_release = nfs3svc_release_fhandle,
 886                 .pc_argsize = sizeof(struct nfsd3_writeargs),
 887                 .pc_argzero = sizeof(struct nfsd3_writeargs),
 888                 .pc_ressize = sizeof(struct nfsd3_writeres),
 889                 .pc_cachetype = RC_REPLBUFF,
 890                 .pc_xdrressize = ST+WC+4,
 891                 .pc_name = "WRITE",
 892         },
 893         [NFS3PROC_CREATE] = {
 894                 .pc_func = nfsd3_proc_create,
 895                 .pc_decode = nfs3svc_decode_createargs,
 896                 .pc_encode = nfs3svc_encode_createres,
 897                 .pc_release = nfs3svc_release_fhandle2,
 898                 .pc_argsize = sizeof(struct nfsd3_createargs),
 899                 .pc_argzero = sizeof(struct nfsd3_createargs),
 900                 .pc_ressize = sizeof(struct nfsd3_createres),
 901                 .pc_cachetype = RC_REPLBUFF,
 902                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 903                 .pc_name = "CREATE",
 904         },
 905         [NFS3PROC_MKDIR] = {
 906                 .pc_func = nfsd3_proc_mkdir,
 907                 .pc_decode = nfs3svc_decode_mkdirargs,
 908                 .pc_encode = nfs3svc_encode_createres,
 909                 .pc_release = nfs3svc_release_fhandle2,
 910                 .pc_argsize = sizeof(struct nfsd3_mkdirargs),
 911                 .pc_argzero = sizeof(struct nfsd3_mkdirargs),
 912                 .pc_ressize = sizeof(struct nfsd3_createres),
 913                 .pc_cachetype = RC_REPLBUFF,
 914                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 915                 .pc_name = "MKDIR",
 916         },
 917         [NFS3PROC_SYMLINK] = {
 918                 .pc_func = nfsd3_proc_symlink,
 919                 .pc_decode = nfs3svc_decode_symlinkargs,
 920                 .pc_encode = nfs3svc_encode_createres,
 921                 .pc_release = nfs3svc_release_fhandle2,
 922                 .pc_argsize = sizeof(struct nfsd3_symlinkargs),
 923                 .pc_argzero = sizeof(struct nfsd3_symlinkargs),
 924                 .pc_ressize = sizeof(struct nfsd3_createres),
 925                 .pc_cachetype = RC_REPLBUFF,
 926                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 927                 .pc_name = "SYMLINK",
 928         },
 929         [NFS3PROC_MKNOD] = {
 930                 .pc_func = nfsd3_proc_mknod,
 931                 .pc_decode = nfs3svc_decode_mknodargs,
 932                 .pc_encode = nfs3svc_encode_createres,
 933                 .pc_release = nfs3svc_release_fhandle2,
 934                 .pc_argsize = sizeof(struct nfsd3_mknodargs),
 935                 .pc_argzero = sizeof(struct nfsd3_mknodargs),
 936                 .pc_ressize = sizeof(struct nfsd3_createres),
 937                 .pc_cachetype = RC_REPLBUFF,
 938                 .pc_xdrressize = ST+(1+FH+pAT)+WC,
 939                 .pc_name = "MKNOD",
 940         },
 941         [NFS3PROC_REMOVE] = {
 942                 .pc_func = nfsd3_proc_remove,
 943                 .pc_decode = nfs3svc_decode_diropargs,
 944                 .pc_encode = nfs3svc_encode_wccstatres,
 945                 .pc_release = nfs3svc_release_fhandle,
 946                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 947                 .pc_argzero = sizeof(struct nfsd3_diropargs),
 948                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 949                 .pc_cachetype = RC_REPLBUFF,
 950                 .pc_xdrressize = ST+WC,
 951                 .pc_name = "REMOVE",
 952         },
 953         [NFS3PROC_RMDIR] = {
 954                 .pc_func = nfsd3_proc_rmdir,
 955                 .pc_decode = nfs3svc_decode_diropargs,
 956                 .pc_encode = nfs3svc_encode_wccstatres,
 957                 .pc_release = nfs3svc_release_fhandle,
 958                 .pc_argsize = sizeof(struct nfsd3_diropargs),
 959                 .pc_argzero = sizeof(struct nfsd3_diropargs),
 960                 .pc_ressize = sizeof(struct nfsd3_wccstatres),
 961                 .pc_cachetype = RC_REPLBUFF,
 962                 .pc_xdrressize = ST+WC,
 963                 .pc_name = "RMDIR",
 964         },
 965         [NFS3PROC_RENAME] = {
 966                 .pc_func = nfsd3_proc_rename,
 967                 .pc_decode = nfs3svc_decode_renameargs,
 968                 .pc_encode = nfs3svc_encode_renameres,
 969                 .pc_release = nfs3svc_release_fhandle2,
 970                 .pc_argsize = sizeof(struct nfsd3_renameargs),
 971                 .pc_argzero = sizeof(struct nfsd3_renameargs),
 972                 .pc_ressize = sizeof(struct nfsd3_renameres),
 973                 .pc_cachetype = RC_REPLBUFF,
 974                 .pc_xdrressize = ST+WC+WC,
 975                 .pc_name = "RENAME",
 976         },
 977         [NFS3PROC_LINK] = {
 978                 .pc_func = nfsd3_proc_link,
 979                 .pc_decode = nfs3svc_decode_linkargs,
 980                 .pc_encode = nfs3svc_encode_linkres,
 981                 .pc_release = nfs3svc_release_fhandle2,
 982                 .pc_argsize = sizeof(struct nfsd3_linkargs),
 983                 .pc_argzero = sizeof(struct nfsd3_linkargs),
 984                 .pc_ressize = sizeof(struct nfsd3_linkres),
 985                 .pc_cachetype = RC_REPLBUFF,
 986                 .pc_xdrressize = ST+pAT+WC,
 987                 .pc_name = "LINK",
 988         },
 989         [NFS3PROC_READDIR] = {
 990                 .pc_func = nfsd3_proc_readdir,
 991                 .pc_decode = nfs3svc_decode_readdirargs,
 992                 .pc_encode = nfs3svc_encode_readdirres,
 993                 .pc_release = nfs3svc_release_fhandle,
 994                 .pc_argsize = sizeof(struct nfsd3_readdirargs),
 995                 .pc_argzero = sizeof(struct nfsd3_readdirargs),
 996                 .pc_ressize = sizeof(struct nfsd3_readdirres),
 997                 .pc_cachetype = RC_NOCACHE,
 998                 .pc_name = "READDIR",
 999         },
1000         [NFS3PROC_READDIRPLUS] = {
1001                 .pc_func = nfsd3_proc_readdirplus,
1002                 .pc_decode = nfs3svc_decode_readdirplusargs,
1003                 .pc_encode = nfs3svc_encode_readdirres,
1004                 .pc_release = nfs3svc_release_fhandle,
1005                 .pc_argsize = sizeof(struct nfsd3_readdirplusargs),
1006                 .pc_argzero = sizeof(struct nfsd3_readdirplusargs),
1007                 .pc_ressize = sizeof(struct nfsd3_readdirres),
1008                 .pc_cachetype = RC_NOCACHE,
1009                 .pc_name = "READDIRPLUS",
1010         },
1011         [NFS3PROC_FSSTAT] = {
1012                 .pc_func = nfsd3_proc_fsstat,
1013                 .pc_decode = nfs3svc_decode_fhandleargs,
1014                 .pc_encode = nfs3svc_encode_fsstatres,
1015                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1016                 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1017                 .pc_ressize = sizeof(struct nfsd3_fsstatres),
1018                 .pc_cachetype = RC_NOCACHE,
1019                 .pc_xdrressize = ST+pAT+2*6+1,
1020                 .pc_name = "FSSTAT",
1021         },
1022         [NFS3PROC_FSINFO] = {
1023                 .pc_func = nfsd3_proc_fsinfo,
1024                 .pc_decode = nfs3svc_decode_fhandleargs,
1025                 .pc_encode = nfs3svc_encode_fsinfores,
1026                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1027                 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1028                 .pc_ressize = sizeof(struct nfsd3_fsinfores),
1029                 .pc_cachetype = RC_NOCACHE,
1030                 .pc_xdrressize = ST+pAT+12,
1031                 .pc_name = "FSINFO",
1032         },
1033         [NFS3PROC_PATHCONF] = {
1034                 .pc_func = nfsd3_proc_pathconf,
1035                 .pc_decode = nfs3svc_decode_fhandleargs,
1036                 .pc_encode = nfs3svc_encode_pathconfres,
1037                 .pc_argsize = sizeof(struct nfsd3_fhandleargs),
1038                 .pc_argzero = sizeof(struct nfsd3_fhandleargs),
1039                 .pc_ressize = sizeof(struct nfsd3_pathconfres),
1040                 .pc_cachetype = RC_NOCACHE,
1041                 .pc_xdrressize = ST+pAT+6,
1042                 .pc_name = "PATHCONF",
1043         },
1044         [NFS3PROC_COMMIT] = {
1045                 .pc_func = nfsd3_proc_commit,
1046                 .pc_decode = nfs3svc_decode_commitargs,
1047                 .pc_encode = nfs3svc_encode_commitres,
1048                 .pc_release = nfs3svc_release_fhandle,
1049                 .pc_argsize = sizeof(struct nfsd3_commitargs),
1050                 .pc_argzero = sizeof(struct nfsd3_commitargs),
1051                 .pc_ressize = sizeof(struct nfsd3_commitres),
1052                 .pc_cachetype = RC_NOCACHE,
1053                 .pc_xdrressize = ST+WC+2,
1054                 .pc_name = "COMMIT",
1055         },
1056 };
1057
1058 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1059                               nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]);
1060 const struct svc_version nfsd_version3 = {
1061         .vs_vers        = 3,
1062         .vs_nproc       = ARRAY_SIZE(nfsd_procedures3),
1063         .vs_proc        = nfsd_procedures3,
1064         .vs_dispatch    = nfsd_dispatch,
1065         .vs_count       = nfsd_count3,
1066         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
1067 };