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#include "trace.h" 18 19#define NFSDDBG_FACILITY NFSDDBG_FH 20 21 22/* 23 * our acceptability function. 24 * if NOSUBTREECHECK, accept anything 25 * if not, require that we can walk up to exp->ex_dentry 26 * doing some checks on the 'x' bits 27 */ 28static int nfsd_acceptable(void *expv, struct dentry *dentry) 29{ 30 struct svc_export *exp = expv; 31 int rv; 32 struct dentry *tdentry; 33 struct dentry *parent; 34 35 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 36 return 1; 37 38 tdentry = dget(dentry); 39 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { 40 /* make sure parents give x permission to user */ 41 int err; 42 parent = dget_parent(tdentry); 43 err = inode_permission(d_inode(parent), MAY_EXEC); 44 if (err < 0) { 45 dput(parent); 46 break; 47 } 48 dput(tdentry); 49 tdentry = parent; 50 } 51 if (tdentry != exp->ex_path.dentry) 52 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry); 53 rv = (tdentry == exp->ex_path.dentry); 54 dput(tdentry); 55 return rv; 56} 57 58/* Type check. The correct error return for type mismatches does not seem to be 59 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a 60 * comment in the NFSv3 spec says this is incorrect (implementation notes for 61 * the write call). 62 */ 63static inline __be32 64nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry, 65 umode_t requested) 66{ 67 umode_t mode = d_inode(dentry)->i_mode & S_IFMT; 68 69 if (requested == 0) /* the caller doesn't care */ 70 return nfs_ok; 71 if (mode == requested) { 72 if (mode == S_IFDIR && !d_can_lookup(dentry)) { 73 WARN_ON_ONCE(1); 74 return nfserr_notdir; 75 } 76 return nfs_ok; 77 } 78 /* 79 * v4 has an error more specific than err_notdir which we should 80 * return in preference to err_notdir: 81 */ 82 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 83 return nfserr_symlink; 84 if (requested == S_IFDIR) 85 return nfserr_notdir; 86 if (mode == S_IFDIR) 87 return nfserr_isdir; 88 return nfserr_inval; 89} 90 91static bool nfsd_originating_port_ok(struct svc_rqst *rqstp, int flags) 92{ 93 if (flags & NFSEXP_INSECURE_PORT) 94 return true; 95 /* We don't require gss requests to use low ports: */ 96 if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS) 97 return true; 98 return test_bit(RQ_SECURE, &rqstp->rq_flags); 99} 100 101static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 102 struct svc_export *exp) 103{ 104 int flags = nfsexp_flags(rqstp, exp); 105 106 /* Check if the request originated from a secure port. */ 107 if (!nfsd_originating_port_ok(rqstp, flags)) { 108 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 109 dprintk("nfsd: request from insecure port %s!\n", 110 svc_print_addr(rqstp, buf, sizeof(buf))); 111 return nfserr_perm; 112 } 113 114 /* Set user creds for this exportpoint */ 115 return nfserrno(nfsd_setuser(rqstp, exp)); 116} 117 118static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 119 struct dentry *dentry, struct svc_export *exp) 120{ 121 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 122 return nfs_ok; 123 /* 124 * v2/v3 clients have no need for the V4ROOT export--they use 125 * the mount protocl instead; also, further V4ROOT checks may be 126 * in v4-specific code, in which case v2/v3 clients could bypass 127 * them. 128 */ 129 if (!nfsd_v4client(rqstp)) 130 return nfserr_stale; 131 /* 132 * We're exposing only the directories and symlinks that have to be 133 * traversed on the way to real exports: 134 */ 135 if (unlikely(!d_is_dir(dentry) && 136 !d_is_symlink(dentry))) 137 return nfserr_stale; 138 /* 139 * A pseudoroot export gives permission to access only one 140 * single directory; the kernel has to make another upcall 141 * before granting access to anything else under it: 142 */ 143 if (unlikely(dentry != exp->ex_path.dentry)) 144 return nfserr_stale; 145 return nfs_ok; 146} 147 148/* 149 * Use the given filehandle to look up the corresponding export and 150 * dentry. On success, the results are used to set fh_export and 151 * fh_dentry. 152 */ 153static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 154{ 155 struct knfsd_fh *fh = &fhp->fh_handle; 156 struct fid *fid = NULL, sfid; 157 struct svc_export *exp; 158 struct dentry *dentry; 159 int fileid_type; 160 int data_left = fh->fh_size/4; 161 __be32 error; 162 163 error = nfserr_stale; 164 if (rqstp->rq_vers > 2) 165 error = nfserr_badhandle; 166 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 167 return nfserr_nofilehandle; 168 169 if (fh->fh_version == 1) { 170 int len; 171 172 if (--data_left < 0) 173 return error; 174 if (fh->fh_auth_type != 0) 175 return error; 176 len = key_len(fh->fh_fsid_type) / 4; 177 if (len == 0) 178 return error; 179 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 180 /* deprecated, convert to type 3 */ 181 len = key_len(FSID_ENCODE_DEV)/4; 182 fh->fh_fsid_type = FSID_ENCODE_DEV; 183 /* 184 * struct knfsd_fh uses host-endian fields, which are 185 * sometimes used to hold net-endian values. This 186 * confuses sparse, so we must use __force here to 187 * keep it from complaining. 188 */ 189 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), 190 ntohl((__force __be32)fh->fh_fsid[1]))); 191 fh->fh_fsid[1] = fh->fh_fsid[2]; 192 } 193 data_left -= len; 194 if (data_left < 0) 195 return error; 196 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 197 fid = (struct fid *)(fh->fh_fsid + len); 198 } else { 199 __u32 tfh[2]; 200 dev_t xdev; 201 ino_t xino; 202 203 if (fh->fh_size != NFS_FHSIZE) 204 return error; 205 /* assume old filehandle format */ 206 xdev = old_decode_dev(fh->ofh_xdev); 207 xino = u32_to_ino_t(fh->ofh_xino); 208 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 209 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 210 } 211 212 error = nfserr_stale; 213 if (IS_ERR(exp)) { 214 trace_nfsd_set_fh_dentry_badexport(rqstp, fhp, PTR_ERR(exp)); 215 216 if (PTR_ERR(exp) == -ENOENT) 217 return error; 218 219 return nfserrno(PTR_ERR(exp)); 220 } 221 222 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 223 /* Elevate privileges so that the lack of 'r' or 'x' 224 * permission on some parent directory will 225 * not stop exportfs_decode_fh from being able 226 * to reconnect a directory into the dentry cache. 227 * The same problem can affect "SUBTREECHECK" exports, 228 * but as nfsd_acceptable depends on correct 229 * access control settings being in effect, we cannot 230 * fix that case easily. 231 */ 232 struct cred *new = prepare_creds(); 233 if (!new) { 234 error = nfserrno(-ENOMEM); 235 goto out; 236 } 237 new->cap_effective = 238 cap_raise_nfsd_set(new->cap_effective, 239 new->cap_permitted); 240 put_cred(override_creds(new)); 241 put_cred(new); 242 } else { 243 error = nfsd_setuser_and_check_port(rqstp, exp); 244 if (error) 245 goto out; 246 } 247 248 /* 249 * Look up the dentry using the NFS file handle. 250 */ 251 error = nfserr_stale; 252 if (rqstp->rq_vers > 2) 253 error = nfserr_badhandle; 254 255 if (fh->fh_version != 1) { 256 sfid.i32.ino = fh->ofh_ino; 257 sfid.i32.gen = fh->ofh_generation; 258 sfid.i32.parent_ino = fh->ofh_dirino; 259 fid = &sfid; 260 data_left = 3; 261 if (fh->ofh_dirino == 0) 262 fileid_type = FILEID_INO32_GEN; 263 else 264 fileid_type = FILEID_INO32_GEN_PARENT; 265 } else 266 fileid_type = fh->fh_fileid_type; 267 268 if (fileid_type == FILEID_ROOT) 269 dentry = dget(exp->ex_path.dentry); 270 else { 271 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 272 data_left, fileid_type, 273 nfsd_acceptable, exp); 274 if (IS_ERR_OR_NULL(dentry)) 275 trace_nfsd_set_fh_dentry_badhandle(rqstp, fhp, 276 dentry ? PTR_ERR(dentry) : -ESTALE); 277 } 278 if (dentry == NULL) 279 goto out; 280 if (IS_ERR(dentry)) { 281 if (PTR_ERR(dentry) != -EINVAL) 282 error = nfserrno(PTR_ERR(dentry)); 283 goto out; 284 } 285 286 if (d_is_dir(dentry) && 287 (dentry->d_flags & DCACHE_DISCONNECTED)) { 288 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 289 dentry); 290 } 291 292 fhp->fh_dentry = dentry; 293 fhp->fh_export = exp; 294 return 0; 295out: 296 exp_put(exp); 297 return error; 298} 299 300/** 301 * fh_verify - filehandle lookup and access checking 302 * @rqstp: pointer to current rpc request 303 * @fhp: filehandle to be verified 304 * @type: expected type of object pointed to by filehandle 305 * @access: type of access needed to object 306 * 307 * Look up a dentry from the on-the-wire filehandle, check the client's 308 * access to the export, and set the current task's credentials. 309 * 310 * Regardless of success or failure of fh_verify(), fh_put() should be 311 * called on @fhp when the caller is finished with the filehandle. 312 * 313 * fh_verify() may be called multiple times on a given filehandle, for 314 * example, when processing an NFSv4 compound. The first call will look 315 * up a dentry using the on-the-wire filehandle. Subsequent calls will 316 * skip the lookup and just perform the other checks and possibly change 317 * the current task's credentials. 318 * 319 * @type specifies the type of object expected using one of the S_IF* 320 * constants defined in include/linux/stat.h. The caller may use zero 321 * to indicate that it doesn't care, or a negative integer to indicate 322 * that it expects something not of the given type. 323 * 324 * @access is formed from the NFSD_MAY_* constants defined in 325 * fs/nfsd/vfs.h. 326 */ 327__be32 328fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 329{ 330 struct svc_export *exp; 331 struct dentry *dentry; 332 __be32 error; 333 334 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 335 336 if (!fhp->fh_dentry) { 337 error = nfsd_set_fh_dentry(rqstp, fhp); 338 if (error) 339 goto out; 340 } 341 dentry = fhp->fh_dentry; 342 exp = fhp->fh_export; 343 /* 344 * We still have to do all these permission checks, even when 345 * fh_dentry is already set: 346 * - fh_verify may be called multiple times with different 347 * "access" arguments (e.g. nfsd_proc_create calls 348 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 349 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 350 * - in the NFSv4 case, the filehandle may have been filled 351 * in by fh_compose, and given a dentry, but further 352 * compound operations performed with that filehandle 353 * still need permissions checks. In the worst case, a 354 * mountpoint crossing may have changed the export 355 * options, and we may now need to use a different uid 356 * (for example, if different id-squashing options are in 357 * effect on the new filesystem). 358 */ 359 error = check_pseudo_root(rqstp, dentry, exp); 360 if (error) 361 goto out; 362 363 error = nfsd_setuser_and_check_port(rqstp, exp); 364 if (error) 365 goto out; 366 367 error = nfsd_mode_check(rqstp, dentry, type); 368 if (error) 369 goto out; 370 371 /* 372 * pseudoflavor restrictions are not enforced on NLM, 373 * which clients virtually always use auth_sys for, 374 * even while using RPCSEC_GSS for NFS. 375 */ 376 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 377 goto skip_pseudoflavor_check; 378 /* 379 * Clients may expect to be able to use auth_sys during mount, 380 * even if they use gss for everything else; see section 2.3.2 381 * of rfc 2623. 382 */ 383 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 384 && exp->ex_path.dentry == dentry) 385 goto skip_pseudoflavor_check; 386 387 error = check_nfsd_access(exp, rqstp); 388 if (error) 389 goto out; 390 391skip_pseudoflavor_check: 392 /* Finally, check access permissions. */ 393 error = nfsd_permission(rqstp, exp, dentry, access); 394 395 if (error) { 396 dprintk("fh_verify: %pd2 permission failure, " 397 "acc=%x, error=%d\n", 398 dentry, 399 access, ntohl(error)); 400 } 401out: 402 if (error == nfserr_stale) 403 nfsdstats.fh_stale++; 404 return error; 405} 406 407 408/* 409 * Compose a file handle for an NFS reply. 410 * 411 * Note that when first composed, the dentry may not yet have 412 * an inode. In this case a call to fh_update should be made 413 * before the fh goes out on the wire ... 414 */ 415static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 416 struct dentry *dentry) 417{ 418 if (dentry != exp->ex_path.dentry) { 419 struct fid *fid = (struct fid *) 420 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 421 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 422 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 423 424 fhp->fh_handle.fh_fileid_type = 425 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 426 fhp->fh_handle.fh_size += maxsize * 4; 427 } else { 428 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 429 } 430} 431 432/* 433 * for composing old style file handles 434 */ 435static inline void _fh_update_old(struct dentry *dentry, 436 struct svc_export *exp, 437 struct knfsd_fh *fh) 438{ 439 fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); 440 fh->ofh_generation = d_inode(dentry)->i_generation; 441 if (d_is_dir(dentry) || 442 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 443 fh->ofh_dirino = 0; 444} 445 446static bool is_root_export(struct svc_export *exp) 447{ 448 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 449} 450 451static struct super_block *exp_sb(struct svc_export *exp) 452{ 453 return exp->ex_path.dentry->d_sb; 454} 455 456static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 457{ 458 switch (fsid_type) { 459 case FSID_DEV: 460 if (!old_valid_dev(exp_sb(exp)->s_dev)) 461 return false; 462 fallthrough; 463 case FSID_MAJOR_MINOR: 464 case FSID_ENCODE_DEV: 465 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 466 case FSID_NUM: 467 return exp->ex_flags & NFSEXP_FSID; 468 case FSID_UUID8: 469 case FSID_UUID16: 470 if (!is_root_export(exp)) 471 return false; 472 fallthrough; 473 case FSID_UUID4_INUM: 474 case FSID_UUID16_INUM: 475 return exp->ex_uuid != NULL; 476 } 477 return true; 478} 479 480 481static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 482{ 483 u8 version; 484 u8 fsid_type; 485retry: 486 version = 1; 487 if (ref_fh && ref_fh->fh_export == exp) { 488 version = ref_fh->fh_handle.fh_version; 489 fsid_type = ref_fh->fh_handle.fh_fsid_type; 490 491 ref_fh = NULL; 492 493 switch (version) { 494 case 0xca: 495 fsid_type = FSID_DEV; 496 break; 497 case 1: 498 break; 499 default: 500 goto retry; 501 } 502 503 /* 504 * As the fsid -> filesystem mapping was guided by 505 * user-space, there is no guarantee that the filesystem 506 * actually supports that fsid type. If it doesn't we 507 * loop around again without ref_fh set. 508 */ 509 if (!fsid_type_ok_for_exp(fsid_type, exp)) 510 goto retry; 511 } else if (exp->ex_flags & NFSEXP_FSID) { 512 fsid_type = FSID_NUM; 513 } else if (exp->ex_uuid) { 514 if (fhp->fh_maxsize >= 64) { 515 if (is_root_export(exp)) 516 fsid_type = FSID_UUID16; 517 else 518 fsid_type = FSID_UUID16_INUM; 519 } else { 520 if (is_root_export(exp)) 521 fsid_type = FSID_UUID8; 522 else 523 fsid_type = FSID_UUID4_INUM; 524 } 525 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 526 /* for newer device numbers, we must use a newer fsid format */ 527 fsid_type = FSID_ENCODE_DEV; 528 else 529 fsid_type = FSID_DEV; 530 fhp->fh_handle.fh_version = version; 531 if (version) 532 fhp->fh_handle.fh_fsid_type = fsid_type; 533} 534 535__be32 536fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 537 struct svc_fh *ref_fh) 538{ 539 /* ref_fh is a reference file handle. 540 * if it is non-null and for the same filesystem, then we should compose 541 * a filehandle which is of the same version, where possible. 542 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 543 * Then create a 32byte filehandle using nfs_fhbase_old 544 * 545 */ 546 547 struct inode * inode = d_inode(dentry); 548 dev_t ex_dev = exp_sb(exp)->s_dev; 549 550 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 551 MAJOR(ex_dev), MINOR(ex_dev), 552 (long) d_inode(exp->ex_path.dentry)->i_ino, 553 dentry, 554 (inode ? inode->i_ino : 0)); 555 556 /* Choose filehandle version and fsid type based on 557 * the reference filehandle (if it is in the same export) 558 * or the export options. 559 */ 560 set_version_and_fsid_type(fhp, exp, ref_fh); 561 562 if (ref_fh == fhp) 563 fh_put(ref_fh); 564 565 if (fhp->fh_locked || fhp->fh_dentry) { 566 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 567 dentry); 568 } 569 if (fhp->fh_maxsize < NFS_FHSIZE) 570 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 571 fhp->fh_maxsize, 572 dentry); 573 574 fhp->fh_dentry = dget(dentry); /* our internal copy */ 575 fhp->fh_export = exp_get(exp); 576 577 if (fhp->fh_handle.fh_version == 0xca) { 578 /* old style filehandle please */ 579 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 580 fhp->fh_handle.fh_size = NFS_FHSIZE; 581 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 582 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 583 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 584 fhp->fh_handle.ofh_xino = 585 ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); 586 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 587 if (inode) 588 _fh_update_old(dentry, exp, &fhp->fh_handle); 589 } else { 590 fhp->fh_handle.fh_size = 591 key_len(fhp->fh_handle.fh_fsid_type) + 4; 592 fhp->fh_handle.fh_auth_type = 0; 593 594 mk_fsid(fhp->fh_handle.fh_fsid_type, 595 fhp->fh_handle.fh_fsid, 596 ex_dev, 597 d_inode(exp->ex_path.dentry)->i_ino, 598 exp->ex_fsid, exp->ex_uuid); 599 600 if (inode) 601 _fh_update(fhp, exp, dentry); 602 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 603 fh_put(fhp); 604 return nfserr_opnotsupp; 605 } 606 } 607 608 return 0; 609} 610 611/* 612 * Update file handle information after changing a dentry. 613 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 614 */ 615__be32 616fh_update(struct svc_fh *fhp) 617{ 618 struct dentry *dentry; 619 620 if (!fhp->fh_dentry) 621 goto out_bad; 622 623 dentry = fhp->fh_dentry; 624 if (d_really_is_negative(dentry)) 625 goto out_negative; 626 if (fhp->fh_handle.fh_version != 1) { 627 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 628 } else { 629 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 630 return 0; 631 632 _fh_update(fhp, fhp->fh_export, dentry); 633 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 634 return nfserr_opnotsupp; 635 } 636 return 0; 637out_bad: 638 printk(KERN_ERR "fh_update: fh not verified!\n"); 639 return nfserr_serverfault; 640out_negative: 641 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 642 dentry); 643 return nfserr_serverfault; 644} 645 646/* 647 * Release a file handle. 648 */ 649void 650fh_put(struct svc_fh *fhp) 651{ 652 struct dentry * dentry = fhp->fh_dentry; 653 struct svc_export * exp = fhp->fh_export; 654 if (dentry) { 655 fh_unlock(fhp); 656 fhp->fh_dentry = NULL; 657 dput(dentry); 658 fh_clear_wcc(fhp); 659 } 660 fh_drop_write(fhp); 661 if (exp) { 662 exp_put(exp); 663 fhp->fh_export = NULL; 664 } 665 return; 666} 667 668/* 669 * Shorthand for dprintk()'s 670 */ 671char * SVCFH_fmt(struct svc_fh *fhp) 672{ 673 struct knfsd_fh *fh = &fhp->fh_handle; 674 675 static char buf[80]; 676 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 677 fh->fh_size, 678 fh->fh_base.fh_pad[0], 679 fh->fh_base.fh_pad[1], 680 fh->fh_base.fh_pad[2], 681 fh->fh_base.fh_pad[3], 682 fh->fh_base.fh_pad[4], 683 fh->fh_base.fh_pad[5]); 684 return buf; 685} 686 687enum fsid_source fsid_source(struct svc_fh *fhp) 688{ 689 if (fhp->fh_handle.fh_version != 1) 690 return FSIDSOURCE_DEV; 691 switch(fhp->fh_handle.fh_fsid_type) { 692 case FSID_DEV: 693 case FSID_ENCODE_DEV: 694 case FSID_MAJOR_MINOR: 695 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 696 return FSIDSOURCE_DEV; 697 break; 698 case FSID_NUM: 699 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 700 return FSIDSOURCE_FSID; 701 break; 702 default: 703 break; 704 } 705 /* either a UUID type filehandle, or the filehandle doesn't 706 * match the export. 707 */ 708 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 709 return FSIDSOURCE_FSID; 710 if (fhp->fh_export->ex_uuid) 711 return FSIDSOURCE_UUID; 712 return FSIDSOURCE_DEV; 713} 714