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 */ 28 static 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 */ 63 static inline __be32 64 nfsd_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 91 static 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 } 100 101 static __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 } 117 118 static 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 */ 153 static __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_raw(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 switch (PTR_ERR(dentry)) { 278 case -ENOMEM: 279 case -ETIMEDOUT: 280 break; 281 default: 282 dentry = ERR_PTR(-ESTALE); 283 } 284 } 285 } 286 if (dentry == NULL) 287 goto out; 288 if (IS_ERR(dentry)) { 289 if (PTR_ERR(dentry) != -EINVAL) 290 error = nfserrno(PTR_ERR(dentry)); 291 goto out; 292 } 293 294 if (d_is_dir(dentry) && 295 (dentry->d_flags & DCACHE_DISCONNECTED)) { 296 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 297 dentry); 298 } 299 300 fhp->fh_dentry = dentry; 301 fhp->fh_export = exp; 302 303 switch (rqstp->rq_vers) { 304 case 4: 305 if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOATOMIC_ATTR) 306 fhp->fh_no_atomic_attr = true; 307 break; 308 case 3: 309 if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOWCC) 310 fhp->fh_no_wcc = true; 311 break; 312 case 2: 313 fhp->fh_no_wcc = true; 314 } 315 316 return 0; 317 out: 318 exp_put(exp); 319 return error; 320 } 321 322 /** 323 * fh_verify - filehandle lookup and access checking 324 * @rqstp: pointer to current rpc request 325 * @fhp: filehandle to be verified 326 * @type: expected type of object pointed to by filehandle 327 * @access: type of access needed to object 328 * 329 * Look up a dentry from the on-the-wire filehandle, check the client's 330 * access to the export, and set the current task's credentials. 331 * 332 * Regardless of success or failure of fh_verify(), fh_put() should be 333 * called on @fhp when the caller is finished with the filehandle. 334 * 335 * fh_verify() may be called multiple times on a given filehandle, for 336 * example, when processing an NFSv4 compound. The first call will look 337 * up a dentry using the on-the-wire filehandle. Subsequent calls will 338 * skip the lookup and just perform the other checks and possibly change 339 * the current task's credentials. 340 * 341 * @type specifies the type of object expected using one of the S_IF* 342 * constants defined in include/linux/stat.h. The caller may use zero 343 * to indicate that it doesn't care, or a negative integer to indicate 344 * that it expects something not of the given type. 345 * 346 * @access is formed from the NFSD_MAY_* constants defined in 347 * fs/nfsd/vfs.h. 348 */ 349 __be32 350 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 351 { 352 struct svc_export *exp; 353 struct dentry *dentry; 354 __be32 error; 355 356 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 357 358 if (!fhp->fh_dentry) { 359 error = nfsd_set_fh_dentry(rqstp, fhp); 360 if (error) 361 goto out; 362 } 363 dentry = fhp->fh_dentry; 364 exp = fhp->fh_export; 365 /* 366 * We still have to do all these permission checks, even when 367 * fh_dentry is already set: 368 * - fh_verify may be called multiple times with different 369 * "access" arguments (e.g. nfsd_proc_create calls 370 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 371 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 372 * - in the NFSv4 case, the filehandle may have been filled 373 * in by fh_compose, and given a dentry, but further 374 * compound operations performed with that filehandle 375 * still need permissions checks. In the worst case, a 376 * mountpoint crossing may have changed the export 377 * options, and we may now need to use a different uid 378 * (for example, if different id-squashing options are in 379 * effect on the new filesystem). 380 */ 381 error = check_pseudo_root(rqstp, dentry, exp); 382 if (error) 383 goto out; 384 385 error = nfsd_setuser_and_check_port(rqstp, exp); 386 if (error) 387 goto out; 388 389 error = nfsd_mode_check(rqstp, dentry, type); 390 if (error) 391 goto out; 392 393 /* 394 * pseudoflavor restrictions are not enforced on NLM, 395 * which clients virtually always use auth_sys for, 396 * even while using RPCSEC_GSS for NFS. 397 */ 398 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 399 goto skip_pseudoflavor_check; 400 /* 401 * Clients may expect to be able to use auth_sys during mount, 402 * even if they use gss for everything else; see section 2.3.2 403 * of rfc 2623. 404 */ 405 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 406 && exp->ex_path.dentry == dentry) 407 goto skip_pseudoflavor_check; 408 409 error = check_nfsd_access(exp, rqstp); 410 if (error) 411 goto out; 412 413 skip_pseudoflavor_check: 414 /* Finally, check access permissions. */ 415 error = nfsd_permission(rqstp, exp, dentry, access); 416 417 if (error) { 418 dprintk("fh_verify: %pd2 permission failure, " 419 "acc=%x, error=%d\n", 420 dentry, 421 access, ntohl(error)); 422 } 423 out: 424 if (error == nfserr_stale) 425 nfsdstats.fh_stale++; 426 return error; 427 } 428 429 430 /* 431 * Compose a file handle for an NFS reply. 432 * 433 * Note that when first composed, the dentry may not yet have 434 * an inode. In this case a call to fh_update should be made 435 * before the fh goes out on the wire ... 436 */ 437 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 438 struct dentry *dentry) 439 { 440 if (dentry != exp->ex_path.dentry) { 441 struct fid *fid = (struct fid *) 442 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 443 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 444 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 445 446 fhp->fh_handle.fh_fileid_type = 447 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 448 fhp->fh_handle.fh_size += maxsize * 4; 449 } else { 450 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 451 } 452 } 453 454 /* 455 * for composing old style file handles 456 */ 457 static inline void _fh_update_old(struct dentry *dentry, 458 struct svc_export *exp, 459 struct knfsd_fh *fh) 460 { 461 fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); 462 fh->ofh_generation = d_inode(dentry)->i_generation; 463 if (d_is_dir(dentry) || 464 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 465 fh->ofh_dirino = 0; 466 } 467 468 static bool is_root_export(struct svc_export *exp) 469 { 470 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 471 } 472 473 static struct super_block *exp_sb(struct svc_export *exp) 474 { 475 return exp->ex_path.dentry->d_sb; 476 } 477 478 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 479 { 480 switch (fsid_type) { 481 case FSID_DEV: 482 if (!old_valid_dev(exp_sb(exp)->s_dev)) 483 return false; 484 fallthrough; 485 case FSID_MAJOR_MINOR: 486 case FSID_ENCODE_DEV: 487 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 488 case FSID_NUM: 489 return exp->ex_flags & NFSEXP_FSID; 490 case FSID_UUID8: 491 case FSID_UUID16: 492 if (!is_root_export(exp)) 493 return false; 494 fallthrough; 495 case FSID_UUID4_INUM: 496 case FSID_UUID16_INUM: 497 return exp->ex_uuid != NULL; 498 } 499 return true; 500 } 501 502 503 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 504 { 505 u8 version; 506 u8 fsid_type; 507 retry: 508 version = 1; 509 if (ref_fh && ref_fh->fh_export == exp) { 510 version = ref_fh->fh_handle.fh_version; 511 fsid_type = ref_fh->fh_handle.fh_fsid_type; 512 513 ref_fh = NULL; 514 515 switch (version) { 516 case 0xca: 517 fsid_type = FSID_DEV; 518 break; 519 case 1: 520 break; 521 default: 522 goto retry; 523 } 524 525 /* 526 * As the fsid -> filesystem mapping was guided by 527 * user-space, there is no guarantee that the filesystem 528 * actually supports that fsid type. If it doesn't we 529 * loop around again without ref_fh set. 530 */ 531 if (!fsid_type_ok_for_exp(fsid_type, exp)) 532 goto retry; 533 } else if (exp->ex_flags & NFSEXP_FSID) { 534 fsid_type = FSID_NUM; 535 } else if (exp->ex_uuid) { 536 if (fhp->fh_maxsize >= 64) { 537 if (is_root_export(exp)) 538 fsid_type = FSID_UUID16; 539 else 540 fsid_type = FSID_UUID16_INUM; 541 } else { 542 if (is_root_export(exp)) 543 fsid_type = FSID_UUID8; 544 else 545 fsid_type = FSID_UUID4_INUM; 546 } 547 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 548 /* for newer device numbers, we must use a newer fsid format */ 549 fsid_type = FSID_ENCODE_DEV; 550 else 551 fsid_type = FSID_DEV; 552 fhp->fh_handle.fh_version = version; 553 if (version) 554 fhp->fh_handle.fh_fsid_type = fsid_type; 555 } 556 557 __be32 558 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 559 struct svc_fh *ref_fh) 560 { 561 /* ref_fh is a reference file handle. 562 * if it is non-null and for the same filesystem, then we should compose 563 * a filehandle which is of the same version, where possible. 564 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 565 * Then create a 32byte filehandle using nfs_fhbase_old 566 * 567 */ 568 569 struct inode * inode = d_inode(dentry); 570 dev_t ex_dev = exp_sb(exp)->s_dev; 571 572 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 573 MAJOR(ex_dev), MINOR(ex_dev), 574 (long) d_inode(exp->ex_path.dentry)->i_ino, 575 dentry, 576 (inode ? inode->i_ino : 0)); 577 578 /* Choose filehandle version and fsid type based on 579 * the reference filehandle (if it is in the same export) 580 * or the export options. 581 */ 582 set_version_and_fsid_type(fhp, exp, ref_fh); 583 584 /* If we have a ref_fh, then copy the fh_no_wcc setting from it. */ 585 fhp->fh_no_wcc = ref_fh ? ref_fh->fh_no_wcc : false; 586 587 if (ref_fh == fhp) 588 fh_put(ref_fh); 589 590 if (fhp->fh_locked || fhp->fh_dentry) { 591 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 592 dentry); 593 } 594 if (fhp->fh_maxsize < NFS_FHSIZE) 595 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 596 fhp->fh_maxsize, 597 dentry); 598 599 fhp->fh_dentry = dget(dentry); /* our internal copy */ 600 fhp->fh_export = exp_get(exp); 601 602 if (fhp->fh_handle.fh_version == 0xca) { 603 /* old style filehandle please */ 604 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 605 fhp->fh_handle.fh_size = NFS_FHSIZE; 606 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 607 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 608 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 609 fhp->fh_handle.ofh_xino = 610 ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); 611 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 612 if (inode) 613 _fh_update_old(dentry, exp, &fhp->fh_handle); 614 } else { 615 fhp->fh_handle.fh_size = 616 key_len(fhp->fh_handle.fh_fsid_type) + 4; 617 fhp->fh_handle.fh_auth_type = 0; 618 619 mk_fsid(fhp->fh_handle.fh_fsid_type, 620 fhp->fh_handle.fh_fsid, 621 ex_dev, 622 d_inode(exp->ex_path.dentry)->i_ino, 623 exp->ex_fsid, exp->ex_uuid); 624 625 if (inode) 626 _fh_update(fhp, exp, dentry); 627 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 628 fh_put(fhp); 629 return nfserr_opnotsupp; 630 } 631 } 632 633 return 0; 634 } 635 636 /* 637 * Update file handle information after changing a dentry. 638 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 639 */ 640 __be32 641 fh_update(struct svc_fh *fhp) 642 { 643 struct dentry *dentry; 644 645 if (!fhp->fh_dentry) 646 goto out_bad; 647 648 dentry = fhp->fh_dentry; 649 if (d_really_is_negative(dentry)) 650 goto out_negative; 651 if (fhp->fh_handle.fh_version != 1) { 652 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 653 } else { 654 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 655 return 0; 656 657 _fh_update(fhp, fhp->fh_export, dentry); 658 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 659 return nfserr_opnotsupp; 660 } 661 return 0; 662 out_bad: 663 printk(KERN_ERR "fh_update: fh not verified!\n"); 664 return nfserr_serverfault; 665 out_negative: 666 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 667 dentry); 668 return nfserr_serverfault; 669 } 670 671 /* 672 * Release a file handle. 673 */ 674 void 675 fh_put(struct svc_fh *fhp) 676 { 677 struct dentry * dentry = fhp->fh_dentry; 678 struct svc_export * exp = fhp->fh_export; 679 if (dentry) { 680 fh_unlock(fhp); 681 fhp->fh_dentry = NULL; 682 dput(dentry); 683 fh_clear_wcc(fhp); 684 } 685 fh_drop_write(fhp); 686 if (exp) { 687 exp_put(exp); 688 fhp->fh_export = NULL; 689 } 690 fhp->fh_no_wcc = false; 691 return; 692 } 693 694 /* 695 * Shorthand for dprintk()'s 696 */ 697 char * SVCFH_fmt(struct svc_fh *fhp) 698 { 699 struct knfsd_fh *fh = &fhp->fh_handle; 700 701 static char buf[80]; 702 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 703 fh->fh_size, 704 fh->fh_base.fh_pad[0], 705 fh->fh_base.fh_pad[1], 706 fh->fh_base.fh_pad[2], 707 fh->fh_base.fh_pad[3], 708 fh->fh_base.fh_pad[4], 709 fh->fh_base.fh_pad[5]); 710 return buf; 711 } 712 713 enum fsid_source fsid_source(struct svc_fh *fhp) 714 { 715 if (fhp->fh_handle.fh_version != 1) 716 return FSIDSOURCE_DEV; 717 switch(fhp->fh_handle.fh_fsid_type) { 718 case FSID_DEV: 719 case FSID_ENCODE_DEV: 720 case FSID_MAJOR_MINOR: 721 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 722 return FSIDSOURCE_DEV; 723 break; 724 case FSID_NUM: 725 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 726 return FSIDSOURCE_FSID; 727 break; 728 default: 729 break; 730 } 731 /* either a UUID type filehandle, or the filehandle doesn't 732 * match the export. 733 */ 734 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 735 return FSIDSOURCE_FSID; 736 if (fhp->fh_export->ex_uuid) 737 return FSIDSOURCE_UUID; 738 return FSIDSOURCE_DEV; 739 } 740