1 /* 2 * NFS server file handle treatment. 3 * 4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 5 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> 6 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 7 * ... and again Southern-Winter 2001 to support export_operations 8 */ 9 10 #include <linux/exportfs.h> 11 12 #include <linux/sunrpc/svcauth_gss.h> 13 #include "nfsd.h" 14 #include "vfs.h" 15 #include "auth.h" 16 17 #define NFSDDBG_FACILITY NFSDDBG_FH 18 19 20 /* 21 * our acceptability function. 22 * if NOSUBTREECHECK, accept anything 23 * if not, require that we can walk up to exp->ex_dentry 24 * doing some checks on the 'x' bits 25 */ 26 static int nfsd_acceptable(void *expv, struct dentry *dentry) 27 { 28 struct svc_export *exp = expv; 29 int rv; 30 struct dentry *tdentry; 31 struct dentry *parent; 32 33 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 34 return 1; 35 36 tdentry = dget(dentry); 37 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { 38 /* make sure parents give x permission to user */ 39 int err; 40 parent = dget_parent(tdentry); 41 err = inode_permission(parent->d_inode, MAY_EXEC); 42 if (err < 0) { 43 dput(parent); 44 break; 45 } 46 dput(tdentry); 47 tdentry = parent; 48 } 49 if (tdentry != exp->ex_path.dentry) 50 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry); 51 rv = (tdentry == exp->ex_path.dentry); 52 dput(tdentry); 53 return rv; 54 } 55 56 /* Type check. The correct error return for type mismatches does not seem to be 57 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a 58 * comment in the NFSv3 spec says this is incorrect (implementation notes for 59 * the write call). 60 */ 61 static inline __be32 62 nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested) 63 { 64 mode &= S_IFMT; 65 66 if (requested == 0) /* the caller doesn't care */ 67 return nfs_ok; 68 if (mode == requested) 69 return nfs_ok; 70 /* 71 * v4 has an error more specific than err_notdir which we should 72 * return in preference to err_notdir: 73 */ 74 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 75 return nfserr_symlink; 76 if (requested == S_IFDIR) 77 return nfserr_notdir; 78 if (mode == S_IFDIR) 79 return nfserr_isdir; 80 return nfserr_inval; 81 } 82 83 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 84 struct svc_export *exp) 85 { 86 int flags = nfsexp_flags(rqstp, exp); 87 88 /* Check if the request originated from a secure port. */ 89 if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) { 90 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 91 dprintk("nfsd: request from insecure port %s!\n", 92 svc_print_addr(rqstp, buf, sizeof(buf))); 93 return nfserr_perm; 94 } 95 96 /* Set user creds for this exportpoint */ 97 return nfserrno(nfsd_setuser(rqstp, exp)); 98 } 99 100 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 101 struct dentry *dentry, struct svc_export *exp) 102 { 103 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 104 return nfs_ok; 105 /* 106 * v2/v3 clients have no need for the V4ROOT export--they use 107 * the mount protocl instead; also, further V4ROOT checks may be 108 * in v4-specific code, in which case v2/v3 clients could bypass 109 * them. 110 */ 111 if (!nfsd_v4client(rqstp)) 112 return nfserr_stale; 113 /* 114 * We're exposing only the directories and symlinks that have to be 115 * traversed on the way to real exports: 116 */ 117 if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) && 118 !S_ISLNK(dentry->d_inode->i_mode))) 119 return nfserr_stale; 120 /* 121 * A pseudoroot export gives permission to access only one 122 * single directory; the kernel has to make another upcall 123 * before granting access to anything else under it: 124 */ 125 if (unlikely(dentry != exp->ex_path.dentry)) 126 return nfserr_stale; 127 return nfs_ok; 128 } 129 130 /* 131 * Use the given filehandle to look up the corresponding export and 132 * dentry. On success, the results are used to set fh_export and 133 * fh_dentry. 134 */ 135 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 136 { 137 struct knfsd_fh *fh = &fhp->fh_handle; 138 struct fid *fid = NULL, sfid; 139 struct svc_export *exp; 140 struct dentry *dentry; 141 int fileid_type; 142 int data_left = fh->fh_size/4; 143 __be32 error; 144 145 error = nfserr_stale; 146 if (rqstp->rq_vers > 2) 147 error = nfserr_badhandle; 148 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 149 return nfserr_nofilehandle; 150 151 if (fh->fh_version == 1) { 152 int len; 153 154 if (--data_left < 0) 155 return error; 156 if (fh->fh_auth_type != 0) 157 return error; 158 len = key_len(fh->fh_fsid_type) / 4; 159 if (len == 0) 160 return error; 161 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 162 /* deprecated, convert to type 3 */ 163 len = key_len(FSID_ENCODE_DEV)/4; 164 fh->fh_fsid_type = FSID_ENCODE_DEV; 165 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); 166 fh->fh_fsid[1] = fh->fh_fsid[2]; 167 } 168 data_left -= len; 169 if (data_left < 0) 170 return error; 171 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 172 fid = (struct fid *)(fh->fh_fsid + len); 173 } else { 174 __u32 tfh[2]; 175 dev_t xdev; 176 ino_t xino; 177 178 if (fh->fh_size != NFS_FHSIZE) 179 return error; 180 /* assume old filehandle format */ 181 xdev = old_decode_dev(fh->ofh_xdev); 182 xino = u32_to_ino_t(fh->ofh_xino); 183 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 184 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 185 } 186 187 error = nfserr_stale; 188 if (PTR_ERR(exp) == -ENOENT) 189 return error; 190 191 if (IS_ERR(exp)) 192 return nfserrno(PTR_ERR(exp)); 193 194 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 195 /* Elevate privileges so that the lack of 'r' or 'x' 196 * permission on some parent directory will 197 * not stop exportfs_decode_fh from being able 198 * to reconnect a directory into the dentry cache. 199 * The same problem can affect "SUBTREECHECK" exports, 200 * but as nfsd_acceptable depends on correct 201 * access control settings being in effect, we cannot 202 * fix that case easily. 203 */ 204 struct cred *new = prepare_creds(); 205 if (!new) 206 return nfserrno(-ENOMEM); 207 new->cap_effective = 208 cap_raise_nfsd_set(new->cap_effective, 209 new->cap_permitted); 210 put_cred(override_creds(new)); 211 put_cred(new); 212 } else { 213 error = nfsd_setuser_and_check_port(rqstp, exp); 214 if (error) 215 goto out; 216 } 217 218 /* 219 * Look up the dentry using the NFS file handle. 220 */ 221 error = nfserr_stale; 222 if (rqstp->rq_vers > 2) 223 error = nfserr_badhandle; 224 225 if (fh->fh_version != 1) { 226 sfid.i32.ino = fh->ofh_ino; 227 sfid.i32.gen = fh->ofh_generation; 228 sfid.i32.parent_ino = fh->ofh_dirino; 229 fid = &sfid; 230 data_left = 3; 231 if (fh->ofh_dirino == 0) 232 fileid_type = FILEID_INO32_GEN; 233 else 234 fileid_type = FILEID_INO32_GEN_PARENT; 235 } else 236 fileid_type = fh->fh_fileid_type; 237 238 if (fileid_type == FILEID_ROOT) 239 dentry = dget(exp->ex_path.dentry); 240 else { 241 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 242 data_left, fileid_type, 243 nfsd_acceptable, exp); 244 } 245 if (dentry == NULL) 246 goto out; 247 if (IS_ERR(dentry)) { 248 if (PTR_ERR(dentry) != -EINVAL) 249 error = nfserrno(PTR_ERR(dentry)); 250 goto out; 251 } 252 253 if (S_ISDIR(dentry->d_inode->i_mode) && 254 (dentry->d_flags & DCACHE_DISCONNECTED)) { 255 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 256 dentry); 257 } 258 259 fhp->fh_dentry = dentry; 260 fhp->fh_export = exp; 261 return 0; 262 out: 263 exp_put(exp); 264 return error; 265 } 266 267 /** 268 * fh_verify - filehandle lookup and access checking 269 * @rqstp: pointer to current rpc request 270 * @fhp: filehandle to be verified 271 * @type: expected type of object pointed to by filehandle 272 * @access: type of access needed to object 273 * 274 * Look up a dentry from the on-the-wire filehandle, check the client's 275 * access to the export, and set the current task's credentials. 276 * 277 * Regardless of success or failure of fh_verify(), fh_put() should be 278 * called on @fhp when the caller is finished with the filehandle. 279 * 280 * fh_verify() may be called multiple times on a given filehandle, for 281 * example, when processing an NFSv4 compound. The first call will look 282 * up a dentry using the on-the-wire filehandle. Subsequent calls will 283 * skip the lookup and just perform the other checks and possibly change 284 * the current task's credentials. 285 * 286 * @type specifies the type of object expected using one of the S_IF* 287 * constants defined in include/linux/stat.h. The caller may use zero 288 * to indicate that it doesn't care, or a negative integer to indicate 289 * that it expects something not of the given type. 290 * 291 * @access is formed from the NFSD_MAY_* constants defined in 292 * include/linux/nfsd/nfsd.h. 293 */ 294 __be32 295 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 296 { 297 struct svc_export *exp; 298 struct dentry *dentry; 299 __be32 error; 300 301 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 302 303 if (!fhp->fh_dentry) { 304 error = nfsd_set_fh_dentry(rqstp, fhp); 305 if (error) 306 goto out; 307 } 308 dentry = fhp->fh_dentry; 309 exp = fhp->fh_export; 310 /* 311 * We still have to do all these permission checks, even when 312 * fh_dentry is already set: 313 * - fh_verify may be called multiple times with different 314 * "access" arguments (e.g. nfsd_proc_create calls 315 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 316 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 317 * - in the NFSv4 case, the filehandle may have been filled 318 * in by fh_compose, and given a dentry, but further 319 * compound operations performed with that filehandle 320 * still need permissions checks. In the worst case, a 321 * mountpoint crossing may have changed the export 322 * options, and we may now need to use a different uid 323 * (for example, if different id-squashing options are in 324 * effect on the new filesystem). 325 */ 326 error = check_pseudo_root(rqstp, dentry, exp); 327 if (error) 328 goto out; 329 330 error = nfsd_setuser_and_check_port(rqstp, exp); 331 if (error) 332 goto out; 333 334 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); 335 if (error) 336 goto out; 337 338 /* 339 * pseudoflavor restrictions are not enforced on NLM, 340 * which clients virtually always use auth_sys for, 341 * even while using RPCSEC_GSS for NFS. 342 */ 343 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 344 goto skip_pseudoflavor_check; 345 /* 346 * Clients may expect to be able to use auth_sys during mount, 347 * even if they use gss for everything else; see section 2.3.2 348 * of rfc 2623. 349 */ 350 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 351 && exp->ex_path.dentry == dentry) 352 goto skip_pseudoflavor_check; 353 354 error = check_nfsd_access(exp, rqstp); 355 if (error) 356 goto out; 357 358 skip_pseudoflavor_check: 359 /* Finally, check access permissions. */ 360 error = nfsd_permission(rqstp, exp, dentry, access); 361 362 if (error) { 363 dprintk("fh_verify: %pd2 permission failure, " 364 "acc=%x, error=%d\n", 365 dentry, 366 access, ntohl(error)); 367 } 368 out: 369 if (error == nfserr_stale) 370 nfsdstats.fh_stale++; 371 return error; 372 } 373 374 375 /* 376 * Compose a file handle for an NFS reply. 377 * 378 * Note that when first composed, the dentry may not yet have 379 * an inode. In this case a call to fh_update should be made 380 * before the fh goes out on the wire ... 381 */ 382 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 383 struct dentry *dentry) 384 { 385 if (dentry != exp->ex_path.dentry) { 386 struct fid *fid = (struct fid *) 387 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 388 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 389 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 390 391 fhp->fh_handle.fh_fileid_type = 392 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 393 fhp->fh_handle.fh_size += maxsize * 4; 394 } else { 395 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 396 } 397 } 398 399 /* 400 * for composing old style file handles 401 */ 402 static inline void _fh_update_old(struct dentry *dentry, 403 struct svc_export *exp, 404 struct knfsd_fh *fh) 405 { 406 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); 407 fh->ofh_generation = dentry->d_inode->i_generation; 408 if (S_ISDIR(dentry->d_inode->i_mode) || 409 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 410 fh->ofh_dirino = 0; 411 } 412 413 static bool is_root_export(struct svc_export *exp) 414 { 415 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 416 } 417 418 static struct super_block *exp_sb(struct svc_export *exp) 419 { 420 return exp->ex_path.dentry->d_inode->i_sb; 421 } 422 423 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 424 { 425 switch (fsid_type) { 426 case FSID_DEV: 427 if (!old_valid_dev(exp_sb(exp)->s_dev)) 428 return 0; 429 /* FALL THROUGH */ 430 case FSID_MAJOR_MINOR: 431 case FSID_ENCODE_DEV: 432 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 433 case FSID_NUM: 434 return exp->ex_flags & NFSEXP_FSID; 435 case FSID_UUID8: 436 case FSID_UUID16: 437 if (!is_root_export(exp)) 438 return 0; 439 /* fall through */ 440 case FSID_UUID4_INUM: 441 case FSID_UUID16_INUM: 442 return exp->ex_uuid != NULL; 443 } 444 return 1; 445 } 446 447 448 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 449 { 450 u8 version; 451 u8 fsid_type; 452 retry: 453 version = 1; 454 if (ref_fh && ref_fh->fh_export == exp) { 455 version = ref_fh->fh_handle.fh_version; 456 fsid_type = ref_fh->fh_handle.fh_fsid_type; 457 458 ref_fh = NULL; 459 460 switch (version) { 461 case 0xca: 462 fsid_type = FSID_DEV; 463 break; 464 case 1: 465 break; 466 default: 467 goto retry; 468 } 469 470 /* 471 * As the fsid -> filesystem mapping was guided by 472 * user-space, there is no guarantee that the filesystem 473 * actually supports that fsid type. If it doesn't we 474 * loop around again without ref_fh set. 475 */ 476 if (!fsid_type_ok_for_exp(fsid_type, exp)) 477 goto retry; 478 } else if (exp->ex_flags & NFSEXP_FSID) { 479 fsid_type = FSID_NUM; 480 } else if (exp->ex_uuid) { 481 if (fhp->fh_maxsize >= 64) { 482 if (is_root_export(exp)) 483 fsid_type = FSID_UUID16; 484 else 485 fsid_type = FSID_UUID16_INUM; 486 } else { 487 if (is_root_export(exp)) 488 fsid_type = FSID_UUID8; 489 else 490 fsid_type = FSID_UUID4_INUM; 491 } 492 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 493 /* for newer device numbers, we must use a newer fsid format */ 494 fsid_type = FSID_ENCODE_DEV; 495 else 496 fsid_type = FSID_DEV; 497 fhp->fh_handle.fh_version = version; 498 if (version) 499 fhp->fh_handle.fh_fsid_type = fsid_type; 500 } 501 502 __be32 503 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 504 struct svc_fh *ref_fh) 505 { 506 /* ref_fh is a reference file handle. 507 * if it is non-null and for the same filesystem, then we should compose 508 * a filehandle which is of the same version, where possible. 509 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 510 * Then create a 32byte filehandle using nfs_fhbase_old 511 * 512 */ 513 514 struct inode * inode = dentry->d_inode; 515 dev_t ex_dev = exp_sb(exp)->s_dev; 516 517 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 518 MAJOR(ex_dev), MINOR(ex_dev), 519 (long) exp->ex_path.dentry->d_inode->i_ino, 520 dentry, 521 (inode ? inode->i_ino : 0)); 522 523 /* Choose filehandle version and fsid type based on 524 * the reference filehandle (if it is in the same export) 525 * or the export options. 526 */ 527 set_version_and_fsid_type(fhp, exp, ref_fh); 528 529 if (ref_fh == fhp) 530 fh_put(ref_fh); 531 532 if (fhp->fh_locked || fhp->fh_dentry) { 533 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 534 dentry); 535 } 536 if (fhp->fh_maxsize < NFS_FHSIZE) 537 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 538 fhp->fh_maxsize, 539 dentry); 540 541 fhp->fh_dentry = dget(dentry); /* our internal copy */ 542 fhp->fh_export = exp; 543 cache_get(&exp->h); 544 545 if (fhp->fh_handle.fh_version == 0xca) { 546 /* old style filehandle please */ 547 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 548 fhp->fh_handle.fh_size = NFS_FHSIZE; 549 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 550 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 551 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 552 fhp->fh_handle.ofh_xino = 553 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); 554 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 555 if (inode) 556 _fh_update_old(dentry, exp, &fhp->fh_handle); 557 } else { 558 fhp->fh_handle.fh_size = 559 key_len(fhp->fh_handle.fh_fsid_type) + 4; 560 fhp->fh_handle.fh_auth_type = 0; 561 562 mk_fsid(fhp->fh_handle.fh_fsid_type, 563 fhp->fh_handle.fh_fsid, 564 ex_dev, 565 exp->ex_path.dentry->d_inode->i_ino, 566 exp->ex_fsid, exp->ex_uuid); 567 568 if (inode) 569 _fh_update(fhp, exp, dentry); 570 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 571 fh_put(fhp); 572 return nfserr_opnotsupp; 573 } 574 } 575 576 return 0; 577 } 578 579 /* 580 * Update file handle information after changing a dentry. 581 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 582 */ 583 __be32 584 fh_update(struct svc_fh *fhp) 585 { 586 struct dentry *dentry; 587 588 if (!fhp->fh_dentry) 589 goto out_bad; 590 591 dentry = fhp->fh_dentry; 592 if (!dentry->d_inode) 593 goto out_negative; 594 if (fhp->fh_handle.fh_version != 1) { 595 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 596 } else { 597 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 598 return 0; 599 600 _fh_update(fhp, fhp->fh_export, dentry); 601 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 602 return nfserr_opnotsupp; 603 } 604 return 0; 605 out_bad: 606 printk(KERN_ERR "fh_update: fh not verified!\n"); 607 return nfserr_serverfault; 608 out_negative: 609 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 610 dentry); 611 return nfserr_serverfault; 612 } 613 614 /* 615 * Release a file handle. 616 */ 617 void 618 fh_put(struct svc_fh *fhp) 619 { 620 struct dentry * dentry = fhp->fh_dentry; 621 struct svc_export * exp = fhp->fh_export; 622 if (dentry) { 623 fh_unlock(fhp); 624 fhp->fh_dentry = NULL; 625 dput(dentry); 626 #ifdef CONFIG_NFSD_V3 627 fhp->fh_pre_saved = 0; 628 fhp->fh_post_saved = 0; 629 #endif 630 } 631 fh_drop_write(fhp); 632 if (exp) { 633 exp_put(exp); 634 fhp->fh_export = NULL; 635 } 636 return; 637 } 638 639 /* 640 * Shorthand for dprintk()'s 641 */ 642 char * SVCFH_fmt(struct svc_fh *fhp) 643 { 644 struct knfsd_fh *fh = &fhp->fh_handle; 645 646 static char buf[80]; 647 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 648 fh->fh_size, 649 fh->fh_base.fh_pad[0], 650 fh->fh_base.fh_pad[1], 651 fh->fh_base.fh_pad[2], 652 fh->fh_base.fh_pad[3], 653 fh->fh_base.fh_pad[4], 654 fh->fh_base.fh_pad[5]); 655 return buf; 656 } 657 658 enum fsid_source fsid_source(struct svc_fh *fhp) 659 { 660 if (fhp->fh_handle.fh_version != 1) 661 return FSIDSOURCE_DEV; 662 switch(fhp->fh_handle.fh_fsid_type) { 663 case FSID_DEV: 664 case FSID_ENCODE_DEV: 665 case FSID_MAJOR_MINOR: 666 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 667 return FSIDSOURCE_DEV; 668 break; 669 case FSID_NUM: 670 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 671 return FSIDSOURCE_FSID; 672 break; 673 default: 674 break; 675 } 676 /* either a UUID type filehandle, or the filehandle doesn't 677 * match the export. 678 */ 679 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 680 return FSIDSOURCE_FSID; 681 if (fhp->fh_export->ex_uuid) 682 return FSIDSOURCE_UUID; 683 return FSIDSOURCE_DEV; 684 } 685