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