1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NFS server file handle treatment. 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> 7 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 8 * ... and again Southern-Winter 2001 to support export_operations 9 */ 10 11 #include <linux/exportfs.h> 12 13 #include <linux/sunrpc/svcauth_gss.h> 14 #include "nfsd.h" 15 #include "vfs.h" 16 #include "auth.h" 17 18 #define NFSDDBG_FACILITY NFSDDBG_FH 19 20 21 /* 22 * our acceptability function. 23 * if NOSUBTREECHECK, accept anything 24 * if not, require that we can walk up to exp->ex_dentry 25 * doing some checks on the 'x' bits 26 */ 27 static int nfsd_acceptable(void *expv, struct dentry *dentry) 28 { 29 struct svc_export *exp = expv; 30 int rv; 31 struct dentry *tdentry; 32 struct dentry *parent; 33 34 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 35 return 1; 36 37 tdentry = dget(dentry); 38 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { 39 /* make sure parents give x permission to user */ 40 int err; 41 parent = dget_parent(tdentry); 42 err = inode_permission(d_inode(parent), MAY_EXEC); 43 if (err < 0) { 44 dput(parent); 45 break; 46 } 47 dput(tdentry); 48 tdentry = parent; 49 } 50 if (tdentry != exp->ex_path.dentry) 51 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry); 52 rv = (tdentry == exp->ex_path.dentry); 53 dput(tdentry); 54 return rv; 55 } 56 57 /* Type check. The correct error return for type mismatches does not seem to be 58 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a 59 * comment in the NFSv3 spec says this is incorrect (implementation notes for 60 * the write call). 61 */ 62 static inline __be32 63 nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry, 64 umode_t requested) 65 { 66 umode_t mode = d_inode(dentry)->i_mode & S_IFMT; 67 68 if (requested == 0) /* the caller doesn't care */ 69 return nfs_ok; 70 if (mode == requested) { 71 if (mode == S_IFDIR && !d_can_lookup(dentry)) { 72 WARN_ON_ONCE(1); 73 return nfserr_notdir; 74 } 75 return nfs_ok; 76 } 77 /* 78 * v4 has an error more specific than err_notdir which we should 79 * return in preference to err_notdir: 80 */ 81 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 82 return nfserr_symlink; 83 if (requested == S_IFDIR) 84 return nfserr_notdir; 85 if (mode == S_IFDIR) 86 return nfserr_isdir; 87 return nfserr_inval; 88 } 89 90 static bool nfsd_originating_port_ok(struct svc_rqst *rqstp, int flags) 91 { 92 if (flags & NFSEXP_INSECURE_PORT) 93 return true; 94 /* We don't require gss requests to use low ports: */ 95 if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS) 96 return true; 97 return test_bit(RQ_SECURE, &rqstp->rq_flags); 98 } 99 100 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 101 struct svc_export *exp) 102 { 103 int flags = nfsexp_flags(rqstp, exp); 104 105 /* Check if the request originated from a secure port. */ 106 if (!nfsd_originating_port_ok(rqstp, flags)) { 107 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 108 dprintk("nfsd: request from insecure port %s!\n", 109 svc_print_addr(rqstp, buf, sizeof(buf))); 110 return nfserr_perm; 111 } 112 113 /* Set user creds for this exportpoint */ 114 return nfserrno(nfsd_setuser(rqstp, exp)); 115 } 116 117 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 118 struct dentry *dentry, struct svc_export *exp) 119 { 120 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 121 return nfs_ok; 122 /* 123 * v2/v3 clients have no need for the V4ROOT export--they use 124 * the mount protocl instead; also, further V4ROOT checks may be 125 * in v4-specific code, in which case v2/v3 clients could bypass 126 * them. 127 */ 128 if (!nfsd_v4client(rqstp)) 129 return nfserr_stale; 130 /* 131 * We're exposing only the directories and symlinks that have to be 132 * traversed on the way to real exports: 133 */ 134 if (unlikely(!d_is_dir(dentry) && 135 !d_is_symlink(dentry))) 136 return nfserr_stale; 137 /* 138 * A pseudoroot export gives permission to access only one 139 * single directory; the kernel has to make another upcall 140 * before granting access to anything else under it: 141 */ 142 if (unlikely(dentry != exp->ex_path.dentry)) 143 return nfserr_stale; 144 return nfs_ok; 145 } 146 147 /* 148 * Use the given filehandle to look up the corresponding export and 149 * dentry. On success, the results are used to set fh_export and 150 * fh_dentry. 151 */ 152 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 153 { 154 struct knfsd_fh *fh = &fhp->fh_handle; 155 struct fid *fid = NULL, sfid; 156 struct svc_export *exp; 157 struct dentry *dentry; 158 int fileid_type; 159 int data_left = fh->fh_size/4; 160 __be32 error; 161 162 error = nfserr_stale; 163 if (rqstp->rq_vers > 2) 164 error = nfserr_badhandle; 165 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 166 return nfserr_nofilehandle; 167 168 if (fh->fh_version == 1) { 169 int len; 170 171 if (--data_left < 0) 172 return error; 173 if (fh->fh_auth_type != 0) 174 return error; 175 len = key_len(fh->fh_fsid_type) / 4; 176 if (len == 0) 177 return error; 178 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 179 /* deprecated, convert to type 3 */ 180 len = key_len(FSID_ENCODE_DEV)/4; 181 fh->fh_fsid_type = FSID_ENCODE_DEV; 182 /* 183 * struct knfsd_fh uses host-endian fields, which are 184 * sometimes used to hold net-endian values. This 185 * confuses sparse, so we must use __force here to 186 * keep it from complaining. 187 */ 188 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), 189 ntohl((__force __be32)fh->fh_fsid[1]))); 190 fh->fh_fsid[1] = fh->fh_fsid[2]; 191 } 192 data_left -= len; 193 if (data_left < 0) 194 return error; 195 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 196 fid = (struct fid *)(fh->fh_fsid + len); 197 } else { 198 __u32 tfh[2]; 199 dev_t xdev; 200 ino_t xino; 201 202 if (fh->fh_size != NFS_FHSIZE) 203 return error; 204 /* assume old filehandle format */ 205 xdev = old_decode_dev(fh->ofh_xdev); 206 xino = u32_to_ino_t(fh->ofh_xino); 207 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 208 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 209 } 210 211 error = nfserr_stale; 212 if (PTR_ERR(exp) == -ENOENT) 213 return error; 214 215 if (IS_ERR(exp)) 216 return nfserrno(PTR_ERR(exp)); 217 218 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 219 /* Elevate privileges so that the lack of 'r' or 'x' 220 * permission on some parent directory will 221 * not stop exportfs_decode_fh from being able 222 * to reconnect a directory into the dentry cache. 223 * The same problem can affect "SUBTREECHECK" exports, 224 * but as nfsd_acceptable depends on correct 225 * access control settings being in effect, we cannot 226 * fix that case easily. 227 */ 228 struct cred *new = prepare_creds(); 229 if (!new) { 230 error = nfserrno(-ENOMEM); 231 goto out; 232 } 233 new->cap_effective = 234 cap_raise_nfsd_set(new->cap_effective, 235 new->cap_permitted); 236 put_cred(override_creds(new)); 237 put_cred(new); 238 } else { 239 error = nfsd_setuser_and_check_port(rqstp, exp); 240 if (error) 241 goto out; 242 } 243 244 /* 245 * Look up the dentry using the NFS file handle. 246 */ 247 error = nfserr_stale; 248 if (rqstp->rq_vers > 2) 249 error = nfserr_badhandle; 250 251 if (fh->fh_version != 1) { 252 sfid.i32.ino = fh->ofh_ino; 253 sfid.i32.gen = fh->ofh_generation; 254 sfid.i32.parent_ino = fh->ofh_dirino; 255 fid = &sfid; 256 data_left = 3; 257 if (fh->ofh_dirino == 0) 258 fileid_type = FILEID_INO32_GEN; 259 else 260 fileid_type = FILEID_INO32_GEN_PARENT; 261 } else 262 fileid_type = fh->fh_fileid_type; 263 264 if (fileid_type == FILEID_ROOT) 265 dentry = dget(exp->ex_path.dentry); 266 else { 267 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 268 data_left, fileid_type, 269 nfsd_acceptable, exp); 270 } 271 if (dentry == NULL) 272 goto out; 273 if (IS_ERR(dentry)) { 274 if (PTR_ERR(dentry) != -EINVAL) 275 error = nfserrno(PTR_ERR(dentry)); 276 goto out; 277 } 278 279 if (d_is_dir(dentry) && 280 (dentry->d_flags & DCACHE_DISCONNECTED)) { 281 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 282 dentry); 283 } 284 285 fhp->fh_dentry = dentry; 286 fhp->fh_export = exp; 287 return 0; 288 out: 289 exp_put(exp); 290 return error; 291 } 292 293 /** 294 * fh_verify - filehandle lookup and access checking 295 * @rqstp: pointer to current rpc request 296 * @fhp: filehandle to be verified 297 * @type: expected type of object pointed to by filehandle 298 * @access: type of access needed to object 299 * 300 * Look up a dentry from the on-the-wire filehandle, check the client's 301 * access to the export, and set the current task's credentials. 302 * 303 * Regardless of success or failure of fh_verify(), fh_put() should be 304 * called on @fhp when the caller is finished with the filehandle. 305 * 306 * fh_verify() may be called multiple times on a given filehandle, for 307 * example, when processing an NFSv4 compound. The first call will look 308 * up a dentry using the on-the-wire filehandle. Subsequent calls will 309 * skip the lookup and just perform the other checks and possibly change 310 * the current task's credentials. 311 * 312 * @type specifies the type of object expected using one of the S_IF* 313 * constants defined in include/linux/stat.h. The caller may use zero 314 * to indicate that it doesn't care, or a negative integer to indicate 315 * that it expects something not of the given type. 316 * 317 * @access is formed from the NFSD_MAY_* constants defined in 318 * fs/nfsd/vfs.h. 319 */ 320 __be32 321 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 322 { 323 struct svc_export *exp; 324 struct dentry *dentry; 325 __be32 error; 326 327 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 328 329 if (!fhp->fh_dentry) { 330 error = nfsd_set_fh_dentry(rqstp, fhp); 331 if (error) 332 goto out; 333 } 334 dentry = fhp->fh_dentry; 335 exp = fhp->fh_export; 336 /* 337 * We still have to do all these permission checks, even when 338 * fh_dentry is already set: 339 * - fh_verify may be called multiple times with different 340 * "access" arguments (e.g. nfsd_proc_create calls 341 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 342 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 343 * - in the NFSv4 case, the filehandle may have been filled 344 * in by fh_compose, and given a dentry, but further 345 * compound operations performed with that filehandle 346 * still need permissions checks. In the worst case, a 347 * mountpoint crossing may have changed the export 348 * options, and we may now need to use a different uid 349 * (for example, if different id-squashing options are in 350 * effect on the new filesystem). 351 */ 352 error = check_pseudo_root(rqstp, dentry, exp); 353 if (error) 354 goto out; 355 356 error = nfsd_setuser_and_check_port(rqstp, exp); 357 if (error) 358 goto out; 359 360 error = nfsd_mode_check(rqstp, dentry, type); 361 if (error) 362 goto out; 363 364 /* 365 * pseudoflavor restrictions are not enforced on NLM, 366 * which clients virtually always use auth_sys for, 367 * even while using RPCSEC_GSS for NFS. 368 */ 369 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 370 goto skip_pseudoflavor_check; 371 /* 372 * Clients may expect to be able to use auth_sys during mount, 373 * even if they use gss for everything else; see section 2.3.2 374 * of rfc 2623. 375 */ 376 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 377 && exp->ex_path.dentry == dentry) 378 goto skip_pseudoflavor_check; 379 380 error = check_nfsd_access(exp, rqstp); 381 if (error) 382 goto out; 383 384 skip_pseudoflavor_check: 385 /* Finally, check access permissions. */ 386 error = nfsd_permission(rqstp, exp, dentry, access); 387 388 if (error) { 389 dprintk("fh_verify: %pd2 permission failure, " 390 "acc=%x, error=%d\n", 391 dentry, 392 access, ntohl(error)); 393 } 394 out: 395 if (error == nfserr_stale) 396 nfsdstats.fh_stale++; 397 return error; 398 } 399 400 401 /* 402 * Compose a file handle for an NFS reply. 403 * 404 * Note that when first composed, the dentry may not yet have 405 * an inode. In this case a call to fh_update should be made 406 * before the fh goes out on the wire ... 407 */ 408 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 409 struct dentry *dentry) 410 { 411 if (dentry != exp->ex_path.dentry) { 412 struct fid *fid = (struct fid *) 413 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 414 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 415 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 416 417 fhp->fh_handle.fh_fileid_type = 418 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 419 fhp->fh_handle.fh_size += maxsize * 4; 420 } else { 421 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 422 } 423 } 424 425 /* 426 * for composing old style file handles 427 */ 428 static inline void _fh_update_old(struct dentry *dentry, 429 struct svc_export *exp, 430 struct knfsd_fh *fh) 431 { 432 fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); 433 fh->ofh_generation = d_inode(dentry)->i_generation; 434 if (d_is_dir(dentry) || 435 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 436 fh->ofh_dirino = 0; 437 } 438 439 static bool is_root_export(struct svc_export *exp) 440 { 441 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 442 } 443 444 static struct super_block *exp_sb(struct svc_export *exp) 445 { 446 return exp->ex_path.dentry->d_sb; 447 } 448 449 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 450 { 451 switch (fsid_type) { 452 case FSID_DEV: 453 if (!old_valid_dev(exp_sb(exp)->s_dev)) 454 return 0; 455 /* FALL THROUGH */ 456 case FSID_MAJOR_MINOR: 457 case FSID_ENCODE_DEV: 458 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 459 case FSID_NUM: 460 return exp->ex_flags & NFSEXP_FSID; 461 case FSID_UUID8: 462 case FSID_UUID16: 463 if (!is_root_export(exp)) 464 return 0; 465 /* fall through */ 466 case FSID_UUID4_INUM: 467 case FSID_UUID16_INUM: 468 return exp->ex_uuid != NULL; 469 } 470 return 1; 471 } 472 473 474 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 475 { 476 u8 version; 477 u8 fsid_type; 478 retry: 479 version = 1; 480 if (ref_fh && ref_fh->fh_export == exp) { 481 version = ref_fh->fh_handle.fh_version; 482 fsid_type = ref_fh->fh_handle.fh_fsid_type; 483 484 ref_fh = NULL; 485 486 switch (version) { 487 case 0xca: 488 fsid_type = FSID_DEV; 489 break; 490 case 1: 491 break; 492 default: 493 goto retry; 494 } 495 496 /* 497 * As the fsid -> filesystem mapping was guided by 498 * user-space, there is no guarantee that the filesystem 499 * actually supports that fsid type. If it doesn't we 500 * loop around again without ref_fh set. 501 */ 502 if (!fsid_type_ok_for_exp(fsid_type, exp)) 503 goto retry; 504 } else if (exp->ex_flags & NFSEXP_FSID) { 505 fsid_type = FSID_NUM; 506 } else if (exp->ex_uuid) { 507 if (fhp->fh_maxsize >= 64) { 508 if (is_root_export(exp)) 509 fsid_type = FSID_UUID16; 510 else 511 fsid_type = FSID_UUID16_INUM; 512 } else { 513 if (is_root_export(exp)) 514 fsid_type = FSID_UUID8; 515 else 516 fsid_type = FSID_UUID4_INUM; 517 } 518 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 519 /* for newer device numbers, we must use a newer fsid format */ 520 fsid_type = FSID_ENCODE_DEV; 521 else 522 fsid_type = FSID_DEV; 523 fhp->fh_handle.fh_version = version; 524 if (version) 525 fhp->fh_handle.fh_fsid_type = fsid_type; 526 } 527 528 __be32 529 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 530 struct svc_fh *ref_fh) 531 { 532 /* ref_fh is a reference file handle. 533 * if it is non-null and for the same filesystem, then we should compose 534 * a filehandle which is of the same version, where possible. 535 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 536 * Then create a 32byte filehandle using nfs_fhbase_old 537 * 538 */ 539 540 struct inode * inode = d_inode(dentry); 541 dev_t ex_dev = exp_sb(exp)->s_dev; 542 543 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 544 MAJOR(ex_dev), MINOR(ex_dev), 545 (long) d_inode(exp->ex_path.dentry)->i_ino, 546 dentry, 547 (inode ? inode->i_ino : 0)); 548 549 /* Choose filehandle version and fsid type based on 550 * the reference filehandle (if it is in the same export) 551 * or the export options. 552 */ 553 set_version_and_fsid_type(fhp, exp, ref_fh); 554 555 if (ref_fh == fhp) 556 fh_put(ref_fh); 557 558 if (fhp->fh_locked || fhp->fh_dentry) { 559 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 560 dentry); 561 } 562 if (fhp->fh_maxsize < NFS_FHSIZE) 563 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 564 fhp->fh_maxsize, 565 dentry); 566 567 fhp->fh_dentry = dget(dentry); /* our internal copy */ 568 fhp->fh_export = exp_get(exp); 569 570 if (fhp->fh_handle.fh_version == 0xca) { 571 /* old style filehandle please */ 572 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 573 fhp->fh_handle.fh_size = NFS_FHSIZE; 574 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 575 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 576 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 577 fhp->fh_handle.ofh_xino = 578 ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); 579 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 580 if (inode) 581 _fh_update_old(dentry, exp, &fhp->fh_handle); 582 } else { 583 fhp->fh_handle.fh_size = 584 key_len(fhp->fh_handle.fh_fsid_type) + 4; 585 fhp->fh_handle.fh_auth_type = 0; 586 587 mk_fsid(fhp->fh_handle.fh_fsid_type, 588 fhp->fh_handle.fh_fsid, 589 ex_dev, 590 d_inode(exp->ex_path.dentry)->i_ino, 591 exp->ex_fsid, exp->ex_uuid); 592 593 if (inode) 594 _fh_update(fhp, exp, dentry); 595 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 596 fh_put(fhp); 597 return nfserr_opnotsupp; 598 } 599 } 600 601 return 0; 602 } 603 604 /* 605 * Update file handle information after changing a dentry. 606 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 607 */ 608 __be32 609 fh_update(struct svc_fh *fhp) 610 { 611 struct dentry *dentry; 612 613 if (!fhp->fh_dentry) 614 goto out_bad; 615 616 dentry = fhp->fh_dentry; 617 if (d_really_is_negative(dentry)) 618 goto out_negative; 619 if (fhp->fh_handle.fh_version != 1) { 620 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 621 } else { 622 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 623 return 0; 624 625 _fh_update(fhp, fhp->fh_export, dentry); 626 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 627 return nfserr_opnotsupp; 628 } 629 return 0; 630 out_bad: 631 printk(KERN_ERR "fh_update: fh not verified!\n"); 632 return nfserr_serverfault; 633 out_negative: 634 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 635 dentry); 636 return nfserr_serverfault; 637 } 638 639 /* 640 * Release a file handle. 641 */ 642 void 643 fh_put(struct svc_fh *fhp) 644 { 645 struct dentry * dentry = fhp->fh_dentry; 646 struct svc_export * exp = fhp->fh_export; 647 if (dentry) { 648 fh_unlock(fhp); 649 fhp->fh_dentry = NULL; 650 dput(dentry); 651 fh_clear_wcc(fhp); 652 } 653 fh_drop_write(fhp); 654 if (exp) { 655 exp_put(exp); 656 fhp->fh_export = NULL; 657 } 658 return; 659 } 660 661 /* 662 * Shorthand for dprintk()'s 663 */ 664 char * SVCFH_fmt(struct svc_fh *fhp) 665 { 666 struct knfsd_fh *fh = &fhp->fh_handle; 667 668 static char buf[80]; 669 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 670 fh->fh_size, 671 fh->fh_base.fh_pad[0], 672 fh->fh_base.fh_pad[1], 673 fh->fh_base.fh_pad[2], 674 fh->fh_base.fh_pad[3], 675 fh->fh_base.fh_pad[4], 676 fh->fh_base.fh_pad[5]); 677 return buf; 678 } 679 680 enum fsid_source fsid_source(struct svc_fh *fhp) 681 { 682 if (fhp->fh_handle.fh_version != 1) 683 return FSIDSOURCE_DEV; 684 switch(fhp->fh_handle.fh_fsid_type) { 685 case FSID_DEV: 686 case FSID_ENCODE_DEV: 687 case FSID_MAJOR_MINOR: 688 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 689 return FSIDSOURCE_DEV; 690 break; 691 case FSID_NUM: 692 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 693 return FSIDSOURCE_FSID; 694 break; 695 default: 696 break; 697 } 698 /* either a UUID type filehandle, or the filehandle doesn't 699 * match the export. 700 */ 701 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 702 return FSIDSOURCE_FSID; 703 if (fhp->fh_export->ex_uuid) 704 return FSIDSOURCE_UUID; 705 return FSIDSOURCE_DEV; 706 } 707