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 /* 166 * struct knfsd_fh uses host-endian fields, which are 167 * sometimes used to hold net-endian values. This 168 * confuses sparse, so we must use __force here to 169 * keep it from complaining. 170 */ 171 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), 172 ntohl((__force __be32)fh->fh_fsid[1]))); 173 fh->fh_fsid[1] = fh->fh_fsid[2]; 174 } 175 data_left -= len; 176 if (data_left < 0) 177 return error; 178 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 179 fid = (struct fid *)(fh->fh_fsid + len); 180 } else { 181 __u32 tfh[2]; 182 dev_t xdev; 183 ino_t xino; 184 185 if (fh->fh_size != NFS_FHSIZE) 186 return error; 187 /* assume old filehandle format */ 188 xdev = old_decode_dev(fh->ofh_xdev); 189 xino = u32_to_ino_t(fh->ofh_xino); 190 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 191 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 192 } 193 194 error = nfserr_stale; 195 if (PTR_ERR(exp) == -ENOENT) 196 return error; 197 198 if (IS_ERR(exp)) 199 return nfserrno(PTR_ERR(exp)); 200 201 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 202 /* Elevate privileges so that the lack of 'r' or 'x' 203 * permission on some parent directory will 204 * not stop exportfs_decode_fh from being able 205 * to reconnect a directory into the dentry cache. 206 * The same problem can affect "SUBTREECHECK" exports, 207 * but as nfsd_acceptable depends on correct 208 * access control settings being in effect, we cannot 209 * fix that case easily. 210 */ 211 struct cred *new = prepare_creds(); 212 if (!new) 213 return nfserrno(-ENOMEM); 214 new->cap_effective = 215 cap_raise_nfsd_set(new->cap_effective, 216 new->cap_permitted); 217 put_cred(override_creds(new)); 218 put_cred(new); 219 } else { 220 error = nfsd_setuser_and_check_port(rqstp, exp); 221 if (error) 222 goto out; 223 } 224 225 /* 226 * Look up the dentry using the NFS file handle. 227 */ 228 error = nfserr_stale; 229 if (rqstp->rq_vers > 2) 230 error = nfserr_badhandle; 231 232 if (fh->fh_version != 1) { 233 sfid.i32.ino = fh->ofh_ino; 234 sfid.i32.gen = fh->ofh_generation; 235 sfid.i32.parent_ino = fh->ofh_dirino; 236 fid = &sfid; 237 data_left = 3; 238 if (fh->ofh_dirino == 0) 239 fileid_type = FILEID_INO32_GEN; 240 else 241 fileid_type = FILEID_INO32_GEN_PARENT; 242 } else 243 fileid_type = fh->fh_fileid_type; 244 245 if (fileid_type == FILEID_ROOT) 246 dentry = dget(exp->ex_path.dentry); 247 else { 248 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 249 data_left, fileid_type, 250 nfsd_acceptable, exp); 251 } 252 if (dentry == NULL) 253 goto out; 254 if (IS_ERR(dentry)) { 255 if (PTR_ERR(dentry) != -EINVAL) 256 error = nfserrno(PTR_ERR(dentry)); 257 goto out; 258 } 259 260 if (S_ISDIR(dentry->d_inode->i_mode) && 261 (dentry->d_flags & DCACHE_DISCONNECTED)) { 262 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 263 dentry); 264 } 265 266 fhp->fh_dentry = dentry; 267 fhp->fh_export = exp; 268 return 0; 269 out: 270 exp_put(exp); 271 return error; 272 } 273 274 /** 275 * fh_verify - filehandle lookup and access checking 276 * @rqstp: pointer to current rpc request 277 * @fhp: filehandle to be verified 278 * @type: expected type of object pointed to by filehandle 279 * @access: type of access needed to object 280 * 281 * Look up a dentry from the on-the-wire filehandle, check the client's 282 * access to the export, and set the current task's credentials. 283 * 284 * Regardless of success or failure of fh_verify(), fh_put() should be 285 * called on @fhp when the caller is finished with the filehandle. 286 * 287 * fh_verify() may be called multiple times on a given filehandle, for 288 * example, when processing an NFSv4 compound. The first call will look 289 * up a dentry using the on-the-wire filehandle. Subsequent calls will 290 * skip the lookup and just perform the other checks and possibly change 291 * the current task's credentials. 292 * 293 * @type specifies the type of object expected using one of the S_IF* 294 * constants defined in include/linux/stat.h. The caller may use zero 295 * to indicate that it doesn't care, or a negative integer to indicate 296 * that it expects something not of the given type. 297 * 298 * @access is formed from the NFSD_MAY_* constants defined in 299 * include/linux/nfsd/nfsd.h. 300 */ 301 __be32 302 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 303 { 304 struct svc_export *exp; 305 struct dentry *dentry; 306 __be32 error; 307 308 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 309 310 if (!fhp->fh_dentry) { 311 error = nfsd_set_fh_dentry(rqstp, fhp); 312 if (error) 313 goto out; 314 } 315 dentry = fhp->fh_dentry; 316 exp = fhp->fh_export; 317 /* 318 * We still have to do all these permission checks, even when 319 * fh_dentry is already set: 320 * - fh_verify may be called multiple times with different 321 * "access" arguments (e.g. nfsd_proc_create calls 322 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 323 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 324 * - in the NFSv4 case, the filehandle may have been filled 325 * in by fh_compose, and given a dentry, but further 326 * compound operations performed with that filehandle 327 * still need permissions checks. In the worst case, a 328 * mountpoint crossing may have changed the export 329 * options, and we may now need to use a different uid 330 * (for example, if different id-squashing options are in 331 * effect on the new filesystem). 332 */ 333 error = check_pseudo_root(rqstp, dentry, exp); 334 if (error) 335 goto out; 336 337 error = nfsd_setuser_and_check_port(rqstp, exp); 338 if (error) 339 goto out; 340 341 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); 342 if (error) 343 goto out; 344 345 /* 346 * pseudoflavor restrictions are not enforced on NLM, 347 * which clients virtually always use auth_sys for, 348 * even while using RPCSEC_GSS for NFS. 349 */ 350 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 351 goto skip_pseudoflavor_check; 352 /* 353 * Clients may expect to be able to use auth_sys during mount, 354 * even if they use gss for everything else; see section 2.3.2 355 * of rfc 2623. 356 */ 357 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 358 && exp->ex_path.dentry == dentry) 359 goto skip_pseudoflavor_check; 360 361 error = check_nfsd_access(exp, rqstp); 362 if (error) 363 goto out; 364 365 skip_pseudoflavor_check: 366 /* Finally, check access permissions. */ 367 error = nfsd_permission(rqstp, exp, dentry, access); 368 369 if (error) { 370 dprintk("fh_verify: %pd2 permission failure, " 371 "acc=%x, error=%d\n", 372 dentry, 373 access, ntohl(error)); 374 } 375 out: 376 if (error == nfserr_stale) 377 nfsdstats.fh_stale++; 378 return error; 379 } 380 381 382 /* 383 * Compose a file handle for an NFS reply. 384 * 385 * Note that when first composed, the dentry may not yet have 386 * an inode. In this case a call to fh_update should be made 387 * before the fh goes out on the wire ... 388 */ 389 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 390 struct dentry *dentry) 391 { 392 if (dentry != exp->ex_path.dentry) { 393 struct fid *fid = (struct fid *) 394 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 395 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 396 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 397 398 fhp->fh_handle.fh_fileid_type = 399 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 400 fhp->fh_handle.fh_size += maxsize * 4; 401 } else { 402 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 403 } 404 } 405 406 /* 407 * for composing old style file handles 408 */ 409 static inline void _fh_update_old(struct dentry *dentry, 410 struct svc_export *exp, 411 struct knfsd_fh *fh) 412 { 413 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); 414 fh->ofh_generation = dentry->d_inode->i_generation; 415 if (S_ISDIR(dentry->d_inode->i_mode) || 416 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 417 fh->ofh_dirino = 0; 418 } 419 420 static bool is_root_export(struct svc_export *exp) 421 { 422 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 423 } 424 425 static struct super_block *exp_sb(struct svc_export *exp) 426 { 427 return exp->ex_path.dentry->d_inode->i_sb; 428 } 429 430 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 431 { 432 switch (fsid_type) { 433 case FSID_DEV: 434 if (!old_valid_dev(exp_sb(exp)->s_dev)) 435 return 0; 436 /* FALL THROUGH */ 437 case FSID_MAJOR_MINOR: 438 case FSID_ENCODE_DEV: 439 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 440 case FSID_NUM: 441 return exp->ex_flags & NFSEXP_FSID; 442 case FSID_UUID8: 443 case FSID_UUID16: 444 if (!is_root_export(exp)) 445 return 0; 446 /* fall through */ 447 case FSID_UUID4_INUM: 448 case FSID_UUID16_INUM: 449 return exp->ex_uuid != NULL; 450 } 451 return 1; 452 } 453 454 455 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 456 { 457 u8 version; 458 u8 fsid_type; 459 retry: 460 version = 1; 461 if (ref_fh && ref_fh->fh_export == exp) { 462 version = ref_fh->fh_handle.fh_version; 463 fsid_type = ref_fh->fh_handle.fh_fsid_type; 464 465 ref_fh = NULL; 466 467 switch (version) { 468 case 0xca: 469 fsid_type = FSID_DEV; 470 break; 471 case 1: 472 break; 473 default: 474 goto retry; 475 } 476 477 /* 478 * As the fsid -> filesystem mapping was guided by 479 * user-space, there is no guarantee that the filesystem 480 * actually supports that fsid type. If it doesn't we 481 * loop around again without ref_fh set. 482 */ 483 if (!fsid_type_ok_for_exp(fsid_type, exp)) 484 goto retry; 485 } else if (exp->ex_flags & NFSEXP_FSID) { 486 fsid_type = FSID_NUM; 487 } else if (exp->ex_uuid) { 488 if (fhp->fh_maxsize >= 64) { 489 if (is_root_export(exp)) 490 fsid_type = FSID_UUID16; 491 else 492 fsid_type = FSID_UUID16_INUM; 493 } else { 494 if (is_root_export(exp)) 495 fsid_type = FSID_UUID8; 496 else 497 fsid_type = FSID_UUID4_INUM; 498 } 499 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 500 /* for newer device numbers, we must use a newer fsid format */ 501 fsid_type = FSID_ENCODE_DEV; 502 else 503 fsid_type = FSID_DEV; 504 fhp->fh_handle.fh_version = version; 505 if (version) 506 fhp->fh_handle.fh_fsid_type = fsid_type; 507 } 508 509 __be32 510 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 511 struct svc_fh *ref_fh) 512 { 513 /* ref_fh is a reference file handle. 514 * if it is non-null and for the same filesystem, then we should compose 515 * a filehandle which is of the same version, where possible. 516 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 517 * Then create a 32byte filehandle using nfs_fhbase_old 518 * 519 */ 520 521 struct inode * inode = dentry->d_inode; 522 dev_t ex_dev = exp_sb(exp)->s_dev; 523 524 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 525 MAJOR(ex_dev), MINOR(ex_dev), 526 (long) exp->ex_path.dentry->d_inode->i_ino, 527 dentry, 528 (inode ? inode->i_ino : 0)); 529 530 /* Choose filehandle version and fsid type based on 531 * the reference filehandle (if it is in the same export) 532 * or the export options. 533 */ 534 set_version_and_fsid_type(fhp, exp, ref_fh); 535 536 if (ref_fh == fhp) 537 fh_put(ref_fh); 538 539 if (fhp->fh_locked || fhp->fh_dentry) { 540 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 541 dentry); 542 } 543 if (fhp->fh_maxsize < NFS_FHSIZE) 544 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 545 fhp->fh_maxsize, 546 dentry); 547 548 fhp->fh_dentry = dget(dentry); /* our internal copy */ 549 fhp->fh_export = exp_get(exp); 550 551 if (fhp->fh_handle.fh_version == 0xca) { 552 /* old style filehandle please */ 553 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 554 fhp->fh_handle.fh_size = NFS_FHSIZE; 555 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 556 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 557 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 558 fhp->fh_handle.ofh_xino = 559 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); 560 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 561 if (inode) 562 _fh_update_old(dentry, exp, &fhp->fh_handle); 563 } else { 564 fhp->fh_handle.fh_size = 565 key_len(fhp->fh_handle.fh_fsid_type) + 4; 566 fhp->fh_handle.fh_auth_type = 0; 567 568 mk_fsid(fhp->fh_handle.fh_fsid_type, 569 fhp->fh_handle.fh_fsid, 570 ex_dev, 571 exp->ex_path.dentry->d_inode->i_ino, 572 exp->ex_fsid, exp->ex_uuid); 573 574 if (inode) 575 _fh_update(fhp, exp, dentry); 576 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 577 fh_put(fhp); 578 return nfserr_opnotsupp; 579 } 580 } 581 582 return 0; 583 } 584 585 /* 586 * Update file handle information after changing a dentry. 587 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 588 */ 589 __be32 590 fh_update(struct svc_fh *fhp) 591 { 592 struct dentry *dentry; 593 594 if (!fhp->fh_dentry) 595 goto out_bad; 596 597 dentry = fhp->fh_dentry; 598 if (!dentry->d_inode) 599 goto out_negative; 600 if (fhp->fh_handle.fh_version != 1) { 601 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 602 } else { 603 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 604 return 0; 605 606 _fh_update(fhp, fhp->fh_export, dentry); 607 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 608 return nfserr_opnotsupp; 609 } 610 return 0; 611 out_bad: 612 printk(KERN_ERR "fh_update: fh not verified!\n"); 613 return nfserr_serverfault; 614 out_negative: 615 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 616 dentry); 617 return nfserr_serverfault; 618 } 619 620 /* 621 * Release a file handle. 622 */ 623 void 624 fh_put(struct svc_fh *fhp) 625 { 626 struct dentry * dentry = fhp->fh_dentry; 627 struct svc_export * exp = fhp->fh_export; 628 if (dentry) { 629 fh_unlock(fhp); 630 fhp->fh_dentry = NULL; 631 dput(dentry); 632 #ifdef CONFIG_NFSD_V3 633 fhp->fh_pre_saved = 0; 634 fhp->fh_post_saved = 0; 635 #endif 636 } 637 fh_drop_write(fhp); 638 if (exp) { 639 exp_put(exp); 640 fhp->fh_export = NULL; 641 } 642 return; 643 } 644 645 /* 646 * Shorthand for dprintk()'s 647 */ 648 char * SVCFH_fmt(struct svc_fh *fhp) 649 { 650 struct knfsd_fh *fh = &fhp->fh_handle; 651 652 static char buf[80]; 653 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 654 fh->fh_size, 655 fh->fh_base.fh_pad[0], 656 fh->fh_base.fh_pad[1], 657 fh->fh_base.fh_pad[2], 658 fh->fh_base.fh_pad[3], 659 fh->fh_base.fh_pad[4], 660 fh->fh_base.fh_pad[5]); 661 return buf; 662 } 663 664 enum fsid_source fsid_source(struct svc_fh *fhp) 665 { 666 if (fhp->fh_handle.fh_version != 1) 667 return FSIDSOURCE_DEV; 668 switch(fhp->fh_handle.fh_fsid_type) { 669 case FSID_DEV: 670 case FSID_ENCODE_DEV: 671 case FSID_MAJOR_MINOR: 672 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 673 return FSIDSOURCE_DEV; 674 break; 675 case FSID_NUM: 676 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 677 return FSIDSOURCE_FSID; 678 break; 679 default: 680 break; 681 } 682 /* either a UUID type filehandle, or the filehandle doesn't 683 * match the export. 684 */ 685 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 686 return FSIDSOURCE_FSID; 687 if (fhp->fh_export->ex_uuid) 688 return FSIDSOURCE_UUID; 689 return FSIDSOURCE_DEV; 690 } 691