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