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 unsigned int len; 155 int v; 156 157 dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n", 158 SVCFH_fmt(&argp->fh), 159 (unsigned long) argp->count, 160 (unsigned long long) argp->offset); 161 162 argp->count = min_t(u32, argp->count, svc_max_payload(rqstp)); 163 argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen); 164 if (argp->offset > (u64)OFFSET_MAX) 165 argp->offset = (u64)OFFSET_MAX; 166 if (argp->offset + argp->count > (u64)OFFSET_MAX) 167 argp->count = (u64)OFFSET_MAX - argp->offset; 168 169 v = 0; 170 len = argp->count; 171 resp->pages = rqstp->rq_next_page; 172 while (len > 0) { 173 struct page *page = *(rqstp->rq_next_page++); 174 175 rqstp->rq_vec[v].iov_base = page_address(page); 176 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE); 177 len -= rqstp->rq_vec[v].iov_len; 178 v++; 179 } 180 181 /* Obtain buffer pointer for payload. 182 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof) 183 * + 1 (xdr opaque byte count) = 26 184 */ 185 resp->count = argp->count; 186 svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4); 187 188 fh_copy(&resp->fh, &argp->fh); 189 resp->status = nfsd_read(rqstp, &resp->fh, argp->offset, 190 rqstp->rq_vec, v, &resp->count, &resp->eof); 191 return rpc_success; 192 } 193 194 /* 195 * Write data to a file 196 */ 197 static __be32 198 nfsd3_proc_write(struct svc_rqst *rqstp) 199 { 200 struct nfsd3_writeargs *argp = rqstp->rq_argp; 201 struct nfsd3_writeres *resp = rqstp->rq_resp; 202 unsigned long cnt = argp->len; 203 unsigned int nvecs; 204 205 dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n", 206 SVCFH_fmt(&argp->fh), 207 argp->len, 208 (unsigned long long) argp->offset, 209 argp->stable? " stable" : ""); 210 211 resp->status = nfserr_fbig; 212 if (argp->offset > (u64)OFFSET_MAX || 213 argp->offset + argp->len > (u64)OFFSET_MAX) 214 return rpc_success; 215 216 fh_copy(&resp->fh, &argp->fh); 217 resp->committed = argp->stable; 218 nvecs = svc_fill_write_vector(rqstp, &argp->payload); 219 220 resp->status = nfsd_write(rqstp, &resp->fh, argp->offset, 221 rqstp->rq_vec, nvecs, &cnt, 222 resp->committed, resp->verf); 223 resp->count = cnt; 224 return rpc_success; 225 } 226 227 /* 228 * Implement NFSv3's unchecked, guarded, and exclusive CREATE 229 * semantics for regular files. Except for the created file, 230 * this operation is stateless on the server. 231 * 232 * Upon return, caller must release @fhp and @resfhp. 233 */ 234 static __be32 235 nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp, 236 struct svc_fh *resfhp, struct nfsd3_createargs *argp) 237 { 238 struct iattr *iap = &argp->attrs; 239 struct dentry *parent, *child; 240 struct nfsd_attrs attrs = { 241 .na_iattr = iap, 242 }; 243 __u32 v_mtime, v_atime; 244 struct inode *inode; 245 __be32 status; 246 int host_err; 247 248 if (isdotent(argp->name, argp->len)) 249 return nfserr_exist; 250 if (!(iap->ia_valid & ATTR_MODE)) 251 iap->ia_mode = 0; 252 253 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 254 if (status != nfs_ok) 255 return status; 256 257 parent = fhp->fh_dentry; 258 inode = d_inode(parent); 259 260 host_err = fh_want_write(fhp); 261 if (host_err) 262 return nfserrno(host_err); 263 264 inode_lock_nested(inode, I_MUTEX_PARENT); 265 266 child = lookup_one_len(argp->name, parent, argp->len); 267 if (IS_ERR(child)) { 268 status = nfserrno(PTR_ERR(child)); 269 goto out; 270 } 271 272 if (d_really_is_negative(child)) { 273 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 274 if (status != nfs_ok) 275 goto out; 276 } 277 278 status = fh_compose(resfhp, fhp->fh_export, child, fhp); 279 if (status != nfs_ok) 280 goto out; 281 282 v_mtime = 0; 283 v_atime = 0; 284 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) { 285 u32 *verifier = (u32 *)argp->verf; 286 287 /* 288 * Solaris 7 gets confused (bugid 4218508) if these have 289 * the high bit set, as do xfs filesystems without the 290 * "bigtime" feature. So just clear the high bits. 291 */ 292 v_mtime = verifier[0] & 0x7fffffff; 293 v_atime = verifier[1] & 0x7fffffff; 294 } 295 296 if (d_really_is_positive(child)) { 297 status = nfs_ok; 298 299 switch (argp->createmode) { 300 case NFS3_CREATE_UNCHECKED: 301 if (!d_is_reg(child)) 302 break; 303 iap->ia_valid &= ATTR_SIZE; 304 goto set_attr; 305 case NFS3_CREATE_GUARDED: 306 status = nfserr_exist; 307 break; 308 case NFS3_CREATE_EXCLUSIVE: 309 if (d_inode(child)->i_mtime.tv_sec == v_mtime && 310 d_inode(child)->i_atime.tv_sec == v_atime && 311 d_inode(child)->i_size == 0) { 312 break; 313 } 314 status = nfserr_exist; 315 } 316 goto out; 317 } 318 319 if (!IS_POSIXACL(inode)) 320 iap->ia_mode &= ~current_umask(); 321 322 fh_fill_pre_attrs(fhp); 323 host_err = vfs_create(&init_user_ns, inode, child, iap->ia_mode, true); 324 if (host_err < 0) { 325 status = nfserrno(host_err); 326 goto out; 327 } 328 fh_fill_post_attrs(fhp); 329 330 /* A newly created file already has a file size of zero. */ 331 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 332 iap->ia_valid &= ~ATTR_SIZE; 333 if (argp->createmode == NFS3_CREATE_EXCLUSIVE) { 334 iap->ia_valid = ATTR_MTIME | ATTR_ATIME | 335 ATTR_MTIME_SET | ATTR_ATIME_SET; 336 iap->ia_mtime.tv_sec = v_mtime; 337 iap->ia_atime.tv_sec = v_atime; 338 iap->ia_mtime.tv_nsec = 0; 339 iap->ia_atime.tv_nsec = 0; 340 } 341 342 set_attr: 343 status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs); 344 345 out: 346 inode_unlock(inode); 347 if (child && !IS_ERR(child)) 348 dput(child); 349 fh_drop_write(fhp); 350 return status; 351 } 352 353 static __be32 354 nfsd3_proc_create(struct svc_rqst *rqstp) 355 { 356 struct nfsd3_createargs *argp = rqstp->rq_argp; 357 struct nfsd3_diropres *resp = rqstp->rq_resp; 358 svc_fh *dirfhp, *newfhp; 359 360 dprintk("nfsd: CREATE(3) %s %.*s\n", 361 SVCFH_fmt(&argp->fh), 362 argp->len, 363 argp->name); 364 365 dirfhp = fh_copy(&resp->dirfh, &argp->fh); 366 newfhp = fh_init(&resp->fh, NFS3_FHSIZE); 367 368 resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp); 369 return rpc_success; 370 } 371 372 /* 373 * Make directory. This operation is not idempotent. 374 */ 375 static __be32 376 nfsd3_proc_mkdir(struct svc_rqst *rqstp) 377 { 378 struct nfsd3_createargs *argp = rqstp->rq_argp; 379 struct nfsd3_diropres *resp = rqstp->rq_resp; 380 struct nfsd_attrs attrs = { 381 .na_iattr = &argp->attrs, 382 }; 383 384 dprintk("nfsd: MKDIR(3) %s %.*s\n", 385 SVCFH_fmt(&argp->fh), 386 argp->len, 387 argp->name); 388 389 argp->attrs.ia_valid &= ~ATTR_SIZE; 390 fh_copy(&resp->dirfh, &argp->fh); 391 fh_init(&resp->fh, NFS3_FHSIZE); 392 resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len, 393 &attrs, S_IFDIR, 0, &resp->fh); 394 return rpc_success; 395 } 396 397 static __be32 398 nfsd3_proc_symlink(struct svc_rqst *rqstp) 399 { 400 struct nfsd3_symlinkargs *argp = rqstp->rq_argp; 401 struct nfsd3_diropres *resp = rqstp->rq_resp; 402 struct nfsd_attrs attrs = { 403 .na_iattr = &argp->attrs, 404 }; 405 406 if (argp->tlen == 0) { 407 resp->status = nfserr_inval; 408 goto out; 409 } 410 if (argp->tlen > NFS3_MAXPATHLEN) { 411 resp->status = nfserr_nametoolong; 412 goto out; 413 } 414 415 argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first, 416 page_address(rqstp->rq_arg.pages[0]), 417 argp->tlen); 418 if (IS_ERR(argp->tname)) { 419 resp->status = nfserrno(PTR_ERR(argp->tname)); 420 goto out; 421 } 422 423 dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n", 424 SVCFH_fmt(&argp->ffh), 425 argp->flen, argp->fname, 426 argp->tlen, argp->tname); 427 428 fh_copy(&resp->dirfh, &argp->ffh); 429 fh_init(&resp->fh, NFS3_FHSIZE); 430 resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, 431 argp->flen, argp->tname, &attrs, &resp->fh); 432 kfree(argp->tname); 433 out: 434 return rpc_success; 435 } 436 437 /* 438 * Make socket/fifo/device. 439 */ 440 static __be32 441 nfsd3_proc_mknod(struct svc_rqst *rqstp) 442 { 443 struct nfsd3_mknodargs *argp = rqstp->rq_argp; 444 struct nfsd3_diropres *resp = rqstp->rq_resp; 445 struct nfsd_attrs attrs = { 446 .na_iattr = &argp->attrs, 447 }; 448 int type; 449 dev_t rdev = 0; 450 451 dprintk("nfsd: MKNOD(3) %s %.*s\n", 452 SVCFH_fmt(&argp->fh), 453 argp->len, 454 argp->name); 455 456 fh_copy(&resp->dirfh, &argp->fh); 457 fh_init(&resp->fh, NFS3_FHSIZE); 458 459 if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) { 460 rdev = MKDEV(argp->major, argp->minor); 461 if (MAJOR(rdev) != argp->major || 462 MINOR(rdev) != argp->minor) { 463 resp->status = nfserr_inval; 464 goto out; 465 } 466 } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) { 467 resp->status = nfserr_badtype; 468 goto out; 469 } 470 471 type = nfs3_ftypes[argp->ftype]; 472 resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len, 473 &attrs, type, rdev, &resp->fh); 474 out: 475 return rpc_success; 476 } 477 478 /* 479 * Remove file/fifo/socket etc. 480 */ 481 static __be32 482 nfsd3_proc_remove(struct svc_rqst *rqstp) 483 { 484 struct nfsd3_diropargs *argp = rqstp->rq_argp; 485 struct nfsd3_attrstat *resp = rqstp->rq_resp; 486 487 dprintk("nfsd: REMOVE(3) %s %.*s\n", 488 SVCFH_fmt(&argp->fh), 489 argp->len, 490 argp->name); 491 492 /* Unlink. -S_IFDIR means file must not be a directory */ 493 fh_copy(&resp->fh, &argp->fh); 494 resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, 495 argp->name, argp->len); 496 return rpc_success; 497 } 498 499 /* 500 * Remove a directory 501 */ 502 static __be32 503 nfsd3_proc_rmdir(struct svc_rqst *rqstp) 504 { 505 struct nfsd3_diropargs *argp = rqstp->rq_argp; 506 struct nfsd3_attrstat *resp = rqstp->rq_resp; 507 508 dprintk("nfsd: RMDIR(3) %s %.*s\n", 509 SVCFH_fmt(&argp->fh), 510 argp->len, 511 argp->name); 512 513 fh_copy(&resp->fh, &argp->fh); 514 resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, 515 argp->name, argp->len); 516 return rpc_success; 517 } 518 519 static __be32 520 nfsd3_proc_rename(struct svc_rqst *rqstp) 521 { 522 struct nfsd3_renameargs *argp = rqstp->rq_argp; 523 struct nfsd3_renameres *resp = rqstp->rq_resp; 524 525 dprintk("nfsd: RENAME(3) %s %.*s ->\n", 526 SVCFH_fmt(&argp->ffh), 527 argp->flen, 528 argp->fname); 529 dprintk("nfsd: -> %s %.*s\n", 530 SVCFH_fmt(&argp->tfh), 531 argp->tlen, 532 argp->tname); 533 534 fh_copy(&resp->ffh, &argp->ffh); 535 fh_copy(&resp->tfh, &argp->tfh); 536 resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen, 537 &resp->tfh, argp->tname, argp->tlen); 538 return rpc_success; 539 } 540 541 static __be32 542 nfsd3_proc_link(struct svc_rqst *rqstp) 543 { 544 struct nfsd3_linkargs *argp = rqstp->rq_argp; 545 struct nfsd3_linkres *resp = rqstp->rq_resp; 546 547 dprintk("nfsd: LINK(3) %s ->\n", 548 SVCFH_fmt(&argp->ffh)); 549 dprintk("nfsd: -> %s %.*s\n", 550 SVCFH_fmt(&argp->tfh), 551 argp->tlen, 552 argp->tname); 553 554 fh_copy(&resp->fh, &argp->ffh); 555 fh_copy(&resp->tfh, &argp->tfh); 556 resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen, 557 &resp->fh); 558 return rpc_success; 559 } 560 561 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp, 562 struct nfsd3_readdirres *resp, 563 u32 count) 564 { 565 struct xdr_buf *buf = &resp->dirlist; 566 struct xdr_stream *xdr = &resp->xdr; 567 unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen, 568 svc_max_payload(rqstp)); 569 570 memset(buf, 0, sizeof(*buf)); 571 572 /* Reserve room for the NULL ptr & eof flag (-2 words) */ 573 buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf); 574 buf->buflen -= XDR_UNIT * 2; 575 buf->pages = rqstp->rq_next_page; 576 rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT; 577 578 xdr_init_encode_pages(xdr, buf, buf->pages, NULL); 579 } 580 581 /* 582 * Read a portion of a directory. 583 */ 584 static __be32 585 nfsd3_proc_readdir(struct svc_rqst *rqstp) 586 { 587 struct nfsd3_readdirargs *argp = rqstp->rq_argp; 588 struct nfsd3_readdirres *resp = rqstp->rq_resp; 589 loff_t offset; 590 591 dprintk("nfsd: READDIR(3) %s %d bytes at %d\n", 592 SVCFH_fmt(&argp->fh), 593 argp->count, (u32) argp->cookie); 594 595 nfsd3_init_dirlist_pages(rqstp, resp, argp->count); 596 597 fh_copy(&resp->fh, &argp->fh); 598 resp->common.err = nfs_ok; 599 resp->cookie_offset = 0; 600 resp->rqstp = rqstp; 601 offset = argp->cookie; 602 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset, 603 &resp->common, nfs3svc_encode_entry3); 604 memcpy(resp->verf, argp->verf, 8); 605 nfs3svc_encode_cookie3(resp, offset); 606 607 /* Recycle only pages that were part of the reply */ 608 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 609 610 return rpc_success; 611 } 612 613 /* 614 * Read a portion of a directory, including file handles and attrs. 615 * For now, we choose to ignore the dircount parameter. 616 */ 617 static __be32 618 nfsd3_proc_readdirplus(struct svc_rqst *rqstp) 619 { 620 struct nfsd3_readdirargs *argp = rqstp->rq_argp; 621 struct nfsd3_readdirres *resp = rqstp->rq_resp; 622 loff_t offset; 623 624 dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n", 625 SVCFH_fmt(&argp->fh), 626 argp->count, (u32) argp->cookie); 627 628 nfsd3_init_dirlist_pages(rqstp, resp, argp->count); 629 630 fh_copy(&resp->fh, &argp->fh); 631 resp->common.err = nfs_ok; 632 resp->cookie_offset = 0; 633 resp->rqstp = rqstp; 634 offset = argp->cookie; 635 636 resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP); 637 if (resp->status != nfs_ok) 638 goto out; 639 640 if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) { 641 resp->status = nfserr_notsupp; 642 goto out; 643 } 644 645 resp->status = nfsd_readdir(rqstp, &resp->fh, &offset, 646 &resp->common, nfs3svc_encode_entryplus3); 647 memcpy(resp->verf, argp->verf, 8); 648 nfs3svc_encode_cookie3(resp, offset); 649 650 /* Recycle only pages that were part of the reply */ 651 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 652 653 out: 654 return rpc_success; 655 } 656 657 /* 658 * Get file system stats 659 */ 660 static __be32 661 nfsd3_proc_fsstat(struct svc_rqst *rqstp) 662 { 663 struct nfsd_fhandle *argp = rqstp->rq_argp; 664 struct nfsd3_fsstatres *resp = rqstp->rq_resp; 665 666 dprintk("nfsd: FSSTAT(3) %s\n", 667 SVCFH_fmt(&argp->fh)); 668 669 resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0); 670 fh_put(&argp->fh); 671 return rpc_success; 672 } 673 674 /* 675 * Get file system info 676 */ 677 static __be32 678 nfsd3_proc_fsinfo(struct svc_rqst *rqstp) 679 { 680 struct nfsd_fhandle *argp = rqstp->rq_argp; 681 struct nfsd3_fsinfores *resp = rqstp->rq_resp; 682 u32 max_blocksize = svc_max_payload(rqstp); 683 684 dprintk("nfsd: FSINFO(3) %s\n", 685 SVCFH_fmt(&argp->fh)); 686 687 resp->f_rtmax = max_blocksize; 688 resp->f_rtpref = max_blocksize; 689 resp->f_rtmult = PAGE_SIZE; 690 resp->f_wtmax = max_blocksize; 691 resp->f_wtpref = max_blocksize; 692 resp->f_wtmult = PAGE_SIZE; 693 resp->f_dtpref = max_blocksize; 694 resp->f_maxfilesize = ~(u32) 0; 695 resp->f_properties = NFS3_FSF_DEFAULT; 696 697 resp->status = fh_verify(rqstp, &argp->fh, 0, 698 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT); 699 700 /* Check special features of the file system. May request 701 * different read/write sizes for file systems known to have 702 * problems with large blocks */ 703 if (resp->status == nfs_ok) { 704 struct super_block *sb = argp->fh.fh_dentry->d_sb; 705 706 /* Note that we don't care for remote fs's here */ 707 if (sb->s_magic == MSDOS_SUPER_MAGIC) { 708 resp->f_properties = NFS3_FSF_BILLYBOY; 709 } 710 resp->f_maxfilesize = sb->s_maxbytes; 711 } 712 713 fh_put(&argp->fh); 714 return rpc_success; 715 } 716 717 /* 718 * Get pathconf info for the specified file 719 */ 720 static __be32 721 nfsd3_proc_pathconf(struct svc_rqst *rqstp) 722 { 723 struct nfsd_fhandle *argp = rqstp->rq_argp; 724 struct nfsd3_pathconfres *resp = rqstp->rq_resp; 725 726 dprintk("nfsd: PATHCONF(3) %s\n", 727 SVCFH_fmt(&argp->fh)); 728 729 /* Set default pathconf */ 730 resp->p_link_max = 255; /* at least */ 731 resp->p_name_max = 255; /* at least */ 732 resp->p_no_trunc = 0; 733 resp->p_chown_restricted = 1; 734 resp->p_case_insensitive = 0; 735 resp->p_case_preserving = 1; 736 737 resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP); 738 739 if (resp->status == nfs_ok) { 740 struct super_block *sb = argp->fh.fh_dentry->d_sb; 741 742 /* Note that we don't care for remote fs's here */ 743 switch (sb->s_magic) { 744 case EXT2_SUPER_MAGIC: 745 resp->p_link_max = EXT2_LINK_MAX; 746 resp->p_name_max = EXT2_NAME_LEN; 747 break; 748 case MSDOS_SUPER_MAGIC: 749 resp->p_case_insensitive = 1; 750 resp->p_case_preserving = 0; 751 break; 752 } 753 } 754 755 fh_put(&argp->fh); 756 return rpc_success; 757 } 758 759 /* 760 * Commit a file (range) to stable storage. 761 */ 762 static __be32 763 nfsd3_proc_commit(struct svc_rqst *rqstp) 764 { 765 struct nfsd3_commitargs *argp = rqstp->rq_argp; 766 struct nfsd3_commitres *resp = rqstp->rq_resp; 767 struct nfsd_file *nf; 768 769 dprintk("nfsd: COMMIT(3) %s %u@%Lu\n", 770 SVCFH_fmt(&argp->fh), 771 argp->count, 772 (unsigned long long) argp->offset); 773 774 fh_copy(&resp->fh, &argp->fh); 775 resp->status = nfsd_file_acquire_gc(rqstp, &resp->fh, NFSD_MAY_WRITE | 776 NFSD_MAY_NOT_BREAK_LEASE, &nf); 777 if (resp->status) 778 goto out; 779 resp->status = nfsd_commit(rqstp, &resp->fh, nf, argp->offset, 780 argp->count, resp->verf); 781 nfsd_file_put(nf); 782 out: 783 return rpc_success; 784 } 785 786 787 /* 788 * NFSv3 Server procedures. 789 * Only the results of non-idempotent operations are cached. 790 */ 791 #define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat 792 #define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat 793 #define nfsd3_mkdirargs nfsd3_createargs 794 #define nfsd3_readdirplusargs nfsd3_readdirargs 795 #define nfsd3_fhandleargs nfsd_fhandle 796 #define nfsd3_attrstatres nfsd3_attrstat 797 #define nfsd3_wccstatres nfsd3_attrstat 798 #define nfsd3_createres nfsd3_diropres 799 800 #define ST 1 /* status*/ 801 #define FH 17 /* filehandle with length */ 802 #define AT 21 /* attributes */ 803 #define pAT (1+AT) /* post attributes - conditional */ 804 #define WC (7+pAT) /* WCC attributes */ 805 806 static const struct svc_procedure nfsd_procedures3[22] = { 807 [NFS3PROC_NULL] = { 808 .pc_func = nfsd3_proc_null, 809 .pc_decode = nfssvc_decode_voidarg, 810 .pc_encode = nfssvc_encode_voidres, 811 .pc_argsize = sizeof(struct nfsd_voidargs), 812 .pc_argzero = sizeof(struct nfsd_voidargs), 813 .pc_ressize = sizeof(struct nfsd_voidres), 814 .pc_cachetype = RC_NOCACHE, 815 .pc_xdrressize = ST, 816 .pc_name = "NULL", 817 }, 818 [NFS3PROC_GETATTR] = { 819 .pc_func = nfsd3_proc_getattr, 820 .pc_decode = nfs3svc_decode_fhandleargs, 821 .pc_encode = nfs3svc_encode_getattrres, 822 .pc_release = nfs3svc_release_fhandle, 823 .pc_argsize = sizeof(struct nfsd_fhandle), 824 .pc_argzero = sizeof(struct nfsd_fhandle), 825 .pc_ressize = sizeof(struct nfsd3_attrstatres), 826 .pc_cachetype = RC_NOCACHE, 827 .pc_xdrressize = ST+AT, 828 .pc_name = "GETATTR", 829 }, 830 [NFS3PROC_SETATTR] = { 831 .pc_func = nfsd3_proc_setattr, 832 .pc_decode = nfs3svc_decode_sattrargs, 833 .pc_encode = nfs3svc_encode_wccstatres, 834 .pc_release = nfs3svc_release_fhandle, 835 .pc_argsize = sizeof(struct nfsd3_sattrargs), 836 .pc_argzero = sizeof(struct nfsd3_sattrargs), 837 .pc_ressize = sizeof(struct nfsd3_wccstatres), 838 .pc_cachetype = RC_REPLBUFF, 839 .pc_xdrressize = ST+WC, 840 .pc_name = "SETATTR", 841 }, 842 [NFS3PROC_LOOKUP] = { 843 .pc_func = nfsd3_proc_lookup, 844 .pc_decode = nfs3svc_decode_diropargs, 845 .pc_encode = nfs3svc_encode_lookupres, 846 .pc_release = nfs3svc_release_fhandle2, 847 .pc_argsize = sizeof(struct nfsd3_diropargs), 848 .pc_argzero = sizeof(struct nfsd3_diropargs), 849 .pc_ressize = sizeof(struct nfsd3_diropres), 850 .pc_cachetype = RC_NOCACHE, 851 .pc_xdrressize = ST+FH+pAT+pAT, 852 .pc_name = "LOOKUP", 853 }, 854 [NFS3PROC_ACCESS] = { 855 .pc_func = nfsd3_proc_access, 856 .pc_decode = nfs3svc_decode_accessargs, 857 .pc_encode = nfs3svc_encode_accessres, 858 .pc_release = nfs3svc_release_fhandle, 859 .pc_argsize = sizeof(struct nfsd3_accessargs), 860 .pc_argzero = sizeof(struct nfsd3_accessargs), 861 .pc_ressize = sizeof(struct nfsd3_accessres), 862 .pc_cachetype = RC_NOCACHE, 863 .pc_xdrressize = ST+pAT+1, 864 .pc_name = "ACCESS", 865 }, 866 [NFS3PROC_READLINK] = { 867 .pc_func = nfsd3_proc_readlink, 868 .pc_decode = nfs3svc_decode_fhandleargs, 869 .pc_encode = nfs3svc_encode_readlinkres, 870 .pc_release = nfs3svc_release_fhandle, 871 .pc_argsize = sizeof(struct nfsd_fhandle), 872 .pc_argzero = sizeof(struct nfsd_fhandle), 873 .pc_ressize = sizeof(struct nfsd3_readlinkres), 874 .pc_cachetype = RC_NOCACHE, 875 .pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4, 876 .pc_name = "READLINK", 877 }, 878 [NFS3PROC_READ] = { 879 .pc_func = nfsd3_proc_read, 880 .pc_decode = nfs3svc_decode_readargs, 881 .pc_encode = nfs3svc_encode_readres, 882 .pc_release = nfs3svc_release_fhandle, 883 .pc_argsize = sizeof(struct nfsd3_readargs), 884 .pc_argzero = sizeof(struct nfsd3_readargs), 885 .pc_ressize = sizeof(struct nfsd3_readres), 886 .pc_cachetype = RC_NOCACHE, 887 .pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4, 888 .pc_name = "READ", 889 }, 890 [NFS3PROC_WRITE] = { 891 .pc_func = nfsd3_proc_write, 892 .pc_decode = nfs3svc_decode_writeargs, 893 .pc_encode = nfs3svc_encode_writeres, 894 .pc_release = nfs3svc_release_fhandle, 895 .pc_argsize = sizeof(struct nfsd3_writeargs), 896 .pc_argzero = sizeof(struct nfsd3_writeargs), 897 .pc_ressize = sizeof(struct nfsd3_writeres), 898 .pc_cachetype = RC_REPLBUFF, 899 .pc_xdrressize = ST+WC+4, 900 .pc_name = "WRITE", 901 }, 902 [NFS3PROC_CREATE] = { 903 .pc_func = nfsd3_proc_create, 904 .pc_decode = nfs3svc_decode_createargs, 905 .pc_encode = nfs3svc_encode_createres, 906 .pc_release = nfs3svc_release_fhandle2, 907 .pc_argsize = sizeof(struct nfsd3_createargs), 908 .pc_argzero = sizeof(struct nfsd3_createargs), 909 .pc_ressize = sizeof(struct nfsd3_createres), 910 .pc_cachetype = RC_REPLBUFF, 911 .pc_xdrressize = ST+(1+FH+pAT)+WC, 912 .pc_name = "CREATE", 913 }, 914 [NFS3PROC_MKDIR] = { 915 .pc_func = nfsd3_proc_mkdir, 916 .pc_decode = nfs3svc_decode_mkdirargs, 917 .pc_encode = nfs3svc_encode_createres, 918 .pc_release = nfs3svc_release_fhandle2, 919 .pc_argsize = sizeof(struct nfsd3_mkdirargs), 920 .pc_argzero = sizeof(struct nfsd3_mkdirargs), 921 .pc_ressize = sizeof(struct nfsd3_createres), 922 .pc_cachetype = RC_REPLBUFF, 923 .pc_xdrressize = ST+(1+FH+pAT)+WC, 924 .pc_name = "MKDIR", 925 }, 926 [NFS3PROC_SYMLINK] = { 927 .pc_func = nfsd3_proc_symlink, 928 .pc_decode = nfs3svc_decode_symlinkargs, 929 .pc_encode = nfs3svc_encode_createres, 930 .pc_release = nfs3svc_release_fhandle2, 931 .pc_argsize = sizeof(struct nfsd3_symlinkargs), 932 .pc_argzero = sizeof(struct nfsd3_symlinkargs), 933 .pc_ressize = sizeof(struct nfsd3_createres), 934 .pc_cachetype = RC_REPLBUFF, 935 .pc_xdrressize = ST+(1+FH+pAT)+WC, 936 .pc_name = "SYMLINK", 937 }, 938 [NFS3PROC_MKNOD] = { 939 .pc_func = nfsd3_proc_mknod, 940 .pc_decode = nfs3svc_decode_mknodargs, 941 .pc_encode = nfs3svc_encode_createres, 942 .pc_release = nfs3svc_release_fhandle2, 943 .pc_argsize = sizeof(struct nfsd3_mknodargs), 944 .pc_argzero = sizeof(struct nfsd3_mknodargs), 945 .pc_ressize = sizeof(struct nfsd3_createres), 946 .pc_cachetype = RC_REPLBUFF, 947 .pc_xdrressize = ST+(1+FH+pAT)+WC, 948 .pc_name = "MKNOD", 949 }, 950 [NFS3PROC_REMOVE] = { 951 .pc_func = nfsd3_proc_remove, 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 = "REMOVE", 961 }, 962 [NFS3PROC_RMDIR] = { 963 .pc_func = nfsd3_proc_rmdir, 964 .pc_decode = nfs3svc_decode_diropargs, 965 .pc_encode = nfs3svc_encode_wccstatres, 966 .pc_release = nfs3svc_release_fhandle, 967 .pc_argsize = sizeof(struct nfsd3_diropargs), 968 .pc_argzero = sizeof(struct nfsd3_diropargs), 969 .pc_ressize = sizeof(struct nfsd3_wccstatres), 970 .pc_cachetype = RC_REPLBUFF, 971 .pc_xdrressize = ST+WC, 972 .pc_name = "RMDIR", 973 }, 974 [NFS3PROC_RENAME] = { 975 .pc_func = nfsd3_proc_rename, 976 .pc_decode = nfs3svc_decode_renameargs, 977 .pc_encode = nfs3svc_encode_renameres, 978 .pc_release = nfs3svc_release_fhandle2, 979 .pc_argsize = sizeof(struct nfsd3_renameargs), 980 .pc_argzero = sizeof(struct nfsd3_renameargs), 981 .pc_ressize = sizeof(struct nfsd3_renameres), 982 .pc_cachetype = RC_REPLBUFF, 983 .pc_xdrressize = ST+WC+WC, 984 .pc_name = "RENAME", 985 }, 986 [NFS3PROC_LINK] = { 987 .pc_func = nfsd3_proc_link, 988 .pc_decode = nfs3svc_decode_linkargs, 989 .pc_encode = nfs3svc_encode_linkres, 990 .pc_release = nfs3svc_release_fhandle2, 991 .pc_argsize = sizeof(struct nfsd3_linkargs), 992 .pc_argzero = sizeof(struct nfsd3_linkargs), 993 .pc_ressize = sizeof(struct nfsd3_linkres), 994 .pc_cachetype = RC_REPLBUFF, 995 .pc_xdrressize = ST+pAT+WC, 996 .pc_name = "LINK", 997 }, 998 [NFS3PROC_READDIR] = { 999 .pc_func = nfsd3_proc_readdir, 1000 .pc_decode = nfs3svc_decode_readdirargs, 1001 .pc_encode = nfs3svc_encode_readdirres, 1002 .pc_release = nfs3svc_release_fhandle, 1003 .pc_argsize = sizeof(struct nfsd3_readdirargs), 1004 .pc_argzero = sizeof(struct nfsd3_readdirargs), 1005 .pc_ressize = sizeof(struct nfsd3_readdirres), 1006 .pc_cachetype = RC_NOCACHE, 1007 .pc_name = "READDIR", 1008 }, 1009 [NFS3PROC_READDIRPLUS] = { 1010 .pc_func = nfsd3_proc_readdirplus, 1011 .pc_decode = nfs3svc_decode_readdirplusargs, 1012 .pc_encode = nfs3svc_encode_readdirres, 1013 .pc_release = nfs3svc_release_fhandle, 1014 .pc_argsize = sizeof(struct nfsd3_readdirplusargs), 1015 .pc_argzero = sizeof(struct nfsd3_readdirplusargs), 1016 .pc_ressize = sizeof(struct nfsd3_readdirres), 1017 .pc_cachetype = RC_NOCACHE, 1018 .pc_name = "READDIRPLUS", 1019 }, 1020 [NFS3PROC_FSSTAT] = { 1021 .pc_func = nfsd3_proc_fsstat, 1022 .pc_decode = nfs3svc_decode_fhandleargs, 1023 .pc_encode = nfs3svc_encode_fsstatres, 1024 .pc_argsize = sizeof(struct nfsd3_fhandleargs), 1025 .pc_argzero = sizeof(struct nfsd3_fhandleargs), 1026 .pc_ressize = sizeof(struct nfsd3_fsstatres), 1027 .pc_cachetype = RC_NOCACHE, 1028 .pc_xdrressize = ST+pAT+2*6+1, 1029 .pc_name = "FSSTAT", 1030 }, 1031 [NFS3PROC_FSINFO] = { 1032 .pc_func = nfsd3_proc_fsinfo, 1033 .pc_decode = nfs3svc_decode_fhandleargs, 1034 .pc_encode = nfs3svc_encode_fsinfores, 1035 .pc_argsize = sizeof(struct nfsd3_fhandleargs), 1036 .pc_argzero = sizeof(struct nfsd3_fhandleargs), 1037 .pc_ressize = sizeof(struct nfsd3_fsinfores), 1038 .pc_cachetype = RC_NOCACHE, 1039 .pc_xdrressize = ST+pAT+12, 1040 .pc_name = "FSINFO", 1041 }, 1042 [NFS3PROC_PATHCONF] = { 1043 .pc_func = nfsd3_proc_pathconf, 1044 .pc_decode = nfs3svc_decode_fhandleargs, 1045 .pc_encode = nfs3svc_encode_pathconfres, 1046 .pc_argsize = sizeof(struct nfsd3_fhandleargs), 1047 .pc_argzero = sizeof(struct nfsd3_fhandleargs), 1048 .pc_ressize = sizeof(struct nfsd3_pathconfres), 1049 .pc_cachetype = RC_NOCACHE, 1050 .pc_xdrressize = ST+pAT+6, 1051 .pc_name = "PATHCONF", 1052 }, 1053 [NFS3PROC_COMMIT] = { 1054 .pc_func = nfsd3_proc_commit, 1055 .pc_decode = nfs3svc_decode_commitargs, 1056 .pc_encode = nfs3svc_encode_commitres, 1057 .pc_release = nfs3svc_release_fhandle, 1058 .pc_argsize = sizeof(struct nfsd3_commitargs), 1059 .pc_argzero = sizeof(struct nfsd3_commitargs), 1060 .pc_ressize = sizeof(struct nfsd3_commitres), 1061 .pc_cachetype = RC_NOCACHE, 1062 .pc_xdrressize = ST+WC+2, 1063 .pc_name = "COMMIT", 1064 }, 1065 }; 1066 1067 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]; 1068 const struct svc_version nfsd_version3 = { 1069 .vs_vers = 3, 1070 .vs_nproc = 22, 1071 .vs_proc = nfsd_procedures3, 1072 .vs_dispatch = nfsd_dispatch, 1073 .vs_count = nfsd_count3, 1074 .vs_xdrsize = NFS3_SVC_XDRSIZE, 1075 }; 1076