1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/nfs/inode.c 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * 7 * nfs inode and superblock handling functions 8 * 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 11 * 12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 13 * J.S.Peatfield@damtp.cam.ac.uk 14 * 15 */ 16 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/sched/signal.h> 20 #include <linux/time.h> 21 #include <linux/kernel.h> 22 #include <linux/mm.h> 23 #include <linux/string.h> 24 #include <linux/stat.h> 25 #include <linux/errno.h> 26 #include <linux/unistd.h> 27 #include <linux/sunrpc/clnt.h> 28 #include <linux/sunrpc/stats.h> 29 #include <linux/sunrpc/metrics.h> 30 #include <linux/nfs_fs.h> 31 #include <linux/nfs_mount.h> 32 #include <linux/nfs4_mount.h> 33 #include <linux/lockd/bind.h> 34 #include <linux/seq_file.h> 35 #include <linux/mount.h> 36 #include <linux/vfs.h> 37 #include <linux/inet.h> 38 #include <linux/nfs_xdr.h> 39 #include <linux/slab.h> 40 #include <linux/compat.h> 41 #include <linux/freezer.h> 42 #include <linux/uaccess.h> 43 #include <linux/iversion.h> 44 #include <linux/fileattr.h> 45 #include <linux/nsproxy.h> 46 #include <linux/key-type.h> 47 #include <keys/user-type.h> 48 #ifdef CONFIG_KEYS 49 #include <keys/request_key_auth-type.h> 50 #endif 51 52 #include "nfs4_fs.h" 53 #include "callback.h" 54 #include "delegation.h" 55 #include "iostat.h" 56 #include "internal.h" 57 #include "fscache.h" 58 #include "pnfs.h" 59 #include "nfs.h" 60 #include "netns.h" 61 #include "sysfs.h" 62 63 #include "nfstrace.h" 64 65 #define NFSDBG_FACILITY NFSDBG_VFS 66 67 static bool enable_ino64; 68 69 static int param_set_enable_ino64(const char *val, const struct kernel_param *kp) 70 { 71 pr_notice("enable_ino64 is deprecated and has no effect\n"); 72 return 0; 73 } 74 75 static const struct kernel_param_ops param_ops_enable_ino64 = { 76 .set = param_set_enable_ino64, 77 .get = param_get_bool, 78 }; 79 80 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 81 82 static struct kmem_cache * nfs_inode_cachep; 83 84 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 85 { 86 if (unlikely(nfs_current_task_exiting())) 87 return -EINTR; 88 schedule(); 89 if (signal_pending_state(mode, current)) 90 return -ERESTARTSYS; 91 return 0; 92 } 93 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 94 95 int nfs_drop_inode(struct inode *inode) 96 { 97 return NFS_STALE(inode) || inode_generic_drop(inode); 98 } 99 EXPORT_SYMBOL_GPL(nfs_drop_inode); 100 101 void nfs_clear_inode(struct inode *inode) 102 { 103 /* 104 * The following should never happen... 105 */ 106 WARN_ON_ONCE(nfs_have_writebacks(inode)); 107 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 108 nfs_zap_acl_cache(inode); 109 nfs_access_zap_cache(inode); 110 nfs_fscache_clear_inode(inode); 111 } 112 EXPORT_SYMBOL_GPL(nfs_clear_inode); 113 114 void nfs_evict_inode(struct inode *inode) 115 { 116 truncate_inode_pages_final(&inode->i_data); 117 clear_inode(inode); 118 nfs_clear_inode(inode); 119 } 120 121 int nfs_sync_inode(struct inode *inode) 122 { 123 inode_dio_wait(inode); 124 return nfs_wb_all(inode); 125 } 126 EXPORT_SYMBOL_GPL(nfs_sync_inode); 127 128 /** 129 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 130 * @mapping: pointer to struct address_space 131 */ 132 int nfs_sync_mapping(struct address_space *mapping) 133 { 134 int ret = 0; 135 136 if (mapping->nrpages != 0) { 137 unmap_mapping_range(mapping, 0, 0, 0); 138 ret = nfs_wb_all(mapping->host); 139 } 140 return ret; 141 } 142 143 static int nfs_attribute_timeout(struct inode *inode) 144 { 145 struct nfs_inode *nfsi = NFS_I(inode); 146 147 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 148 } 149 150 static bool nfs_check_cache_flags_invalid(struct inode *inode, 151 unsigned long flags) 152 { 153 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 154 155 return (cache_validity & flags) != 0; 156 } 157 158 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) 159 { 160 if (nfs_check_cache_flags_invalid(inode, flags)) 161 return true; 162 return nfs_attribute_cache_expired(inode); 163 } 164 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid); 165 166 #ifdef CONFIG_NFS_V4_2 167 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) 168 { 169 return nfsi->xattr_cache != NULL; 170 } 171 #else 172 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) 173 { 174 return false; 175 } 176 #endif 177 178 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 179 { 180 struct nfs_inode *nfsi = NFS_I(inode); 181 182 if (nfs_have_delegated_attributes(inode)) { 183 if (!(flags & NFS_INO_REVAL_FORCED)) 184 flags &= ~(NFS_INO_INVALID_MODE | 185 NFS_INO_INVALID_OTHER | 186 NFS_INO_INVALID_BTIME | 187 NFS_INO_INVALID_XATTR); 188 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); 189 } 190 191 if (!nfs_has_xattr_cache(nfsi)) 192 flags &= ~NFS_INO_INVALID_XATTR; 193 if (flags & NFS_INO_INVALID_DATA) 194 nfs_fscache_invalidate(inode, 0); 195 flags &= ~NFS_INO_REVAL_FORCED; 196 197 flags |= nfsi->cache_validity; 198 if (inode->i_mapping->nrpages == 0) 199 flags &= ~NFS_INO_INVALID_DATA; 200 201 /* pairs with nfs_clear_invalid_mapping()'s smp_load_acquire() */ 202 smp_store_release(&nfsi->cache_validity, flags); 203 204 if (inode->i_mapping->nrpages == 0 || 205 nfsi->cache_validity & NFS_INO_INVALID_DATA) { 206 nfs_ooo_clear(nfsi); 207 } 208 trace_nfs_set_cache_invalid(inode, 0); 209 } 210 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid); 211 212 /* 213 * Invalidate the local caches 214 */ 215 static void nfs_zap_caches_locked(struct inode *inode) 216 { 217 struct nfs_inode *nfsi = NFS_I(inode); 218 int mode = inode->i_mode; 219 220 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 221 222 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 223 nfsi->attrtimeo_timestamp = jiffies; 224 225 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | 227 NFS_INO_INVALID_DATA | 228 NFS_INO_INVALID_ACCESS | 229 NFS_INO_INVALID_ACL | 230 NFS_INO_INVALID_XATTR); 231 else 232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | 233 NFS_INO_INVALID_ACCESS | 234 NFS_INO_INVALID_ACL | 235 NFS_INO_INVALID_XATTR); 236 nfs_zap_label_cache_locked(nfsi); 237 } 238 239 void nfs_zap_caches(struct inode *inode) 240 { 241 spin_lock(&inode->i_lock); 242 nfs_zap_caches_locked(inode); 243 spin_unlock(&inode->i_lock); 244 } 245 246 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 247 { 248 if (mapping->nrpages != 0) { 249 spin_lock(&inode->i_lock); 250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 251 spin_unlock(&inode->i_lock); 252 } 253 } 254 255 void nfs_zap_acl_cache(struct inode *inode) 256 { 257 void (*clear_acl_cache)(struct inode *); 258 259 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 260 if (clear_acl_cache != NULL) 261 clear_acl_cache(inode); 262 spin_lock(&inode->i_lock); 263 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 264 spin_unlock(&inode->i_lock); 265 } 266 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 267 268 void nfs_invalidate_atime(struct inode *inode) 269 { 270 if (nfs_have_delegated_atime(inode)) 271 return; 272 spin_lock(&inode->i_lock); 273 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 274 spin_unlock(&inode->i_lock); 275 } 276 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 277 278 /* 279 * Invalidate, but do not unhash, the inode. 280 * NB: must be called with inode->i_lock held! 281 */ 282 static void nfs_set_inode_stale_locked(struct inode *inode) 283 { 284 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 285 nfs_zap_caches_locked(inode); 286 trace_nfs_set_inode_stale(inode); 287 } 288 289 void nfs_set_inode_stale(struct inode *inode) 290 { 291 spin_lock(&inode->i_lock); 292 nfs_set_inode_stale_locked(inode); 293 spin_unlock(&inode->i_lock); 294 } 295 296 struct nfs_find_desc { 297 struct nfs_fh *fh; 298 struct nfs_fattr *fattr; 299 }; 300 301 /* 302 * For re-exported directories (also seen in NFSv2) 303 * we are forced to allow 2 different inodes to have the same 304 * i_ino. 305 */ 306 static int 307 nfs_find_actor(struct inode *inode, void *opaque) 308 { 309 struct nfs_find_desc *desc = opaque; 310 struct nfs_fh *fh = desc->fh; 311 struct nfs_fattr *fattr = desc->fattr; 312 313 if (inode->i_ino != fattr->fileid) 314 return 0; 315 if (inode_wrong_type(inode, fattr->mode)) 316 return 0; 317 if (nfs_compare_fh(NFS_FH(inode), fh)) 318 return 0; 319 if (is_bad_inode(inode) || NFS_STALE(inode)) 320 return 0; 321 return 1; 322 } 323 324 static int 325 nfs_init_locked(struct inode *inode, void *opaque) 326 { 327 struct nfs_find_desc *desc = opaque; 328 struct nfs_fattr *fattr = desc->fattr; 329 330 inode->i_ino = fattr->fileid; 331 inode->i_mode = fattr->mode; 332 nfs_copy_fh(NFS_FH(inode), desc->fh); 333 return 0; 334 } 335 336 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 337 static void nfs_clear_label_invalid(struct inode *inode) 338 { 339 spin_lock(&inode->i_lock); 340 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 341 spin_unlock(&inode->i_lock); 342 } 343 344 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) 345 { 346 int error; 347 348 if (fattr->label == NULL) 349 return; 350 351 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 352 error = security_inode_notifysecctx(inode, fattr->label->label, 353 fattr->label->len); 354 if (error) 355 printk(KERN_ERR "%s() %s %d " 356 "security_inode_notifysecctx() %d\n", 357 __func__, 358 (char *)fattr->label->label, 359 fattr->label->len, error); 360 nfs_clear_label_invalid(inode); 361 } 362 } 363 364 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 365 { 366 struct nfs4_label *label; 367 368 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 369 return NULL; 370 371 label = kzalloc_obj(struct nfs4_label, flags); 372 if (label == NULL) 373 return ERR_PTR(-ENOMEM); 374 375 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 376 if (label->label == NULL) { 377 kfree(label); 378 return ERR_PTR(-ENOMEM); 379 } 380 label->len = NFS4_MAXLABELLEN; 381 382 return label; 383 } 384 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 385 #else 386 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) 387 { 388 } 389 #endif 390 EXPORT_SYMBOL_GPL(nfs_setsecurity); 391 392 /* Search for inode identified by fh, fileid and i_mode in inode cache. */ 393 struct inode * 394 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) 395 { 396 struct nfs_find_desc desc = { 397 .fh = fh, 398 .fattr = fattr, 399 }; 400 struct inode *inode; 401 u64 hash; 402 403 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || 404 !(fattr->valid & NFS_ATTR_FATTR_TYPE)) 405 return NULL; 406 407 hash = fattr->fileid; 408 inode = ilookup5(sb, hash, nfs_find_actor, &desc); 409 410 dprintk("%s: returning %p\n", __func__, inode); 411 return inode; 412 } 413 414 static void nfs_inode_init_regular(struct nfs_inode *nfsi) 415 { 416 atomic_long_set(&nfsi->nrequests, 0); 417 atomic_long_set(&nfsi->redirtied_pages, 0); 418 INIT_LIST_HEAD(&nfsi->commit_info.list); 419 atomic_long_set(&nfsi->commit_info.ncommit, 0); 420 atomic_set(&nfsi->commit_info.rpcs_out, 0); 421 mutex_init(&nfsi->commit_mutex); 422 } 423 424 static void nfs_inode_init_dir(struct nfs_inode *nfsi) 425 { 426 nfsi->cache_change_attribute = 0; 427 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 428 init_rwsem(&nfsi->rmdir_sem); 429 } 430 431 /* 432 * This is our front-end to iget that looks up inodes by file handle 433 * instead of inode number. 434 */ 435 struct inode * 436 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 437 { 438 struct nfs_find_desc desc = { 439 .fh = fh, 440 .fattr = fattr 441 }; 442 struct inode *inode = ERR_PTR(-ENOENT); 443 u64 fattr_supported = NFS_SB(sb)->fattr_valid; 444 u64 hash; 445 446 nfs_attr_check_mountpoint(sb, fattr); 447 448 if (nfs_attr_use_mounted_on_fileid(fattr)) 449 fattr->fileid = fattr->mounted_on_fileid; 450 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 451 goto out_no_inode; 452 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 453 goto out_no_inode; 454 455 hash = fattr->fileid; 456 457 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 458 if (inode == NULL) { 459 inode = ERR_PTR(-ENOMEM); 460 goto out_no_inode; 461 } 462 463 if (inode_state_read_once(inode) & I_NEW) { 464 struct nfs_inode *nfsi = NFS_I(inode); 465 unsigned long now = jiffies; 466 467 /* We can't support update_atime(), since the server will reset it */ 468 inode->i_flags |= S_NOATIME|S_NOCMTIME; 469 inode->i_mode = fattr->mode; 470 nfsi->cache_validity = 0; 471 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 472 && (fattr_supported & NFS_ATTR_FATTR_MODE)) 473 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 474 /* Why so? Because we want revalidate for devices/FIFOs, and 475 * that's precisely what we have in nfs_file_inode_operations. 476 */ 477 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 478 if (S_ISREG(inode->i_mode)) { 479 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 480 inode->i_data.a_ops = &nfs_file_aops; 481 nfs_inode_init_regular(nfsi); 482 mapping_set_large_folios(inode->i_mapping); 483 } else if (S_ISDIR(inode->i_mode)) { 484 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 485 inode->i_fop = &nfs_dir_operations; 486 inode->i_data.a_ops = &nfs_dir_aops; 487 nfs_inode_init_dir(nfsi); 488 /* Deal with crossing mountpoints */ 489 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 490 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 491 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 492 inode->i_op = &nfs_referral_inode_operations; 493 else 494 inode->i_op = &nfs_mountpoint_inode_operations; 495 inode->i_fop = NULL; 496 inode->i_flags |= S_AUTOMOUNT; 497 } 498 } else if (S_ISLNK(inode->i_mode)) { 499 inode->i_op = &nfs_symlink_inode_operations; 500 inode_nohighmem(inode); 501 } else 502 init_special_inode(inode, inode->i_mode, fattr->rdev); 503 504 inode_set_atime(inode, 0, 0); 505 inode_set_mtime(inode, 0, 0); 506 inode_set_ctime(inode, 0, 0); 507 memset(&nfsi->btime, 0, sizeof(nfsi->btime)); 508 inode_set_iversion_raw(inode, 0); 509 inode->i_size = 0; 510 clear_nlink(inode); 511 inode->i_uid = make_kuid(&init_user_ns, -2); 512 inode->i_gid = make_kgid(&init_user_ns, -2); 513 inode->i_blocks = 0; 514 nfsi->write_io = 0; 515 nfsi->read_io = 0; 516 nfsi->uncacheable_file_data = false; 517 518 nfsi->read_cache_jiffies = fattr->time_start; 519 nfsi->attr_gencount = fattr->gencount; 520 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 521 inode_set_atime_to_ts(inode, fattr->atime); 522 else if (fattr_supported & NFS_ATTR_FATTR_ATIME) 523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 524 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 525 inode_set_mtime_to_ts(inode, fattr->mtime); 526 else if (fattr_supported & NFS_ATTR_FATTR_MTIME) 527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 528 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 529 inode_set_ctime_to_ts(inode, fattr->ctime); 530 else if (fattr_supported & NFS_ATTR_FATTR_CTIME) 531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); 532 if (fattr->valid & NFS_ATTR_FATTR_BTIME) 533 nfsi->btime = fattr->btime; 534 else if (fattr_supported & NFS_ATTR_FATTR_BTIME) 535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BTIME); 536 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 537 inode_set_iversion_raw(inode, fattr->change_attr); 538 else 539 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); 540 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 541 inode->i_size = nfs_size_to_loff_t(fattr->size); 542 else 543 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); 544 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 545 set_nlink(inode, fattr->nlink); 546 else if (fattr_supported & NFS_ATTR_FATTR_NLINK) 547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK); 548 else 549 set_nlink(inode, 1); 550 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 551 inode->i_uid = fattr->uid; 552 else if (fattr_supported & NFS_ATTR_FATTR_OWNER) 553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 554 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 555 inode->i_gid = fattr->gid; 556 else if (fattr_supported & NFS_ATTR_FATTR_GROUP) 557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 558 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 559 inode->i_blocks = fattr->du.nfs2.blocks; 560 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED && 561 fattr->size != 0) 562 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 563 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 564 /* 565 * report the blocks in 512byte units 566 */ 567 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 568 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED && 569 fattr->size != 0) 570 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 571 if (fattr->valid & NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA) 572 nfsi->uncacheable_file_data = 573 fattr->aux_flags & NFS_AUX_UNCACHEABLE_FILE_DATA; 574 else if (S_ISREG(inode->i_mode) && 575 (fattr_supported & NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA)) 576 nfs_set_cache_invalid(inode, NFS_INO_INVALID_UNCACHEABLE_FILE_DATA); 577 578 nfs_setsecurity(inode, fattr); 579 580 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 581 nfsi->attrtimeo_timestamp = now; 582 nfsi->access_cache = RB_ROOT; 583 584 nfs_fscache_init_inode(inode); 585 586 unlock_new_inode(inode); 587 } else { 588 int err = nfs_refresh_inode(inode, fattr); 589 if (err < 0) { 590 iput(inode); 591 inode = ERR_PTR(err); 592 goto out_no_inode; 593 } 594 } 595 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 596 inode->i_sb->s_id, 597 (unsigned long long)inode->i_ino, 598 nfs_display_fhandle_hash(fh), 599 icount_read_once(inode)); 600 601 out: 602 return inode; 603 604 out_no_inode: 605 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 606 goto out; 607 } 608 EXPORT_SYMBOL_GPL(nfs_fhget); 609 610 static void 611 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr) 612 { 613 unsigned long cache_validity = NFS_I(inode)->cache_validity; 614 615 if (nfs_have_delegated_mtime(inode)) { 616 if (!(cache_validity & NFS_INO_INVALID_CTIME)) 617 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME | 618 NFS_ATTR_FATTR_CTIME); 619 620 if (!(cache_validity & NFS_INO_INVALID_MTIME)) 621 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME | 622 NFS_ATTR_FATTR_MTIME); 623 624 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 625 fattr->valid &= ~NFS_ATTR_FATTR_ATIME; 626 } else if (nfs_have_delegated_atime(inode)) { 627 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 628 fattr->valid &= ~NFS_ATTR_FATTR_ATIME; 629 } 630 } 631 632 static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr) 633 { 634 unsigned int cache_flags = 0; 635 636 if (attr->ia_valid & ATTR_MTIME_SET) { 637 struct timespec64 ctime = inode_get_ctime(inode); 638 struct timespec64 mtime = inode_get_mtime(inode); 639 struct timespec64 now; 640 bool updated = false; 641 642 now = inode_set_ctime_current(inode); 643 if (!timespec64_equal(&now, &ctime)) 644 updated = true; 645 646 inode_set_mtime_to_ts(inode, attr->ia_mtime); 647 if (!timespec64_equal(&now, &mtime)) 648 updated = true; 649 650 inode_maybe_inc_iversion(inode, updated); 651 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 652 } 653 if (attr->ia_valid & ATTR_ATIME_SET) { 654 inode_set_atime_to_ts(inode, attr->ia_atime); 655 cache_flags |= NFS_INO_INVALID_ATIME; 656 } 657 NFS_I(inode)->cache_validity &= ~cache_flags; 658 } 659 660 static void nfs_update_atime(struct inode *inode) 661 { 662 inode_update_time(inode, FS_UPD_ATIME, 0); 663 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ATIME; 664 } 665 666 static void nfs_update_mtime(struct inode *inode) 667 { 668 inode_update_time(inode, FS_UPD_CMTIME, 0); 669 NFS_I(inode)->cache_validity &= 670 ~(NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME); 671 } 672 673 void nfs_update_delegated_atime(struct inode *inode) 674 { 675 spin_lock(&inode->i_lock); 676 if (nfs_have_delegated_atime(inode)) 677 nfs_update_atime(inode); 678 spin_unlock(&inode->i_lock); 679 } 680 681 void nfs_update_delegated_mtime_locked(struct inode *inode) 682 { 683 if (nfs_have_delegated_mtime(inode) || 684 nfs_have_directory_delegation(inode)) 685 nfs_update_mtime(inode); 686 } 687 688 void nfs_update_delegated_mtime(struct inode *inode) 689 { 690 spin_lock(&inode->i_lock); 691 nfs_update_delegated_mtime_locked(inode); 692 spin_unlock(&inode->i_lock); 693 } 694 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime); 695 696 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN) 697 698 int 699 nfs_setattr(const struct mnt_idmap *idmap, struct dentry *dentry, 700 struct iattr *attr) 701 { 702 struct inode *inode = d_inode(dentry); 703 struct nfs_fattr *fattr; 704 loff_t oldsize; 705 int error = 0; 706 kuid_t task_uid = current_fsuid(); 707 kuid_t owner_uid = inode->i_uid; 708 709 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 710 711 /* skip mode change if it's just for clearing setuid/setgid */ 712 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 713 attr->ia_valid &= ~ATTR_MODE; 714 715 if (S_ISREG(inode->i_mode)) 716 nfs_file_block_o_direct(NFS_I(inode)); 717 718 oldsize = i_size_read(inode); 719 if (attr->ia_valid & ATTR_SIZE) { 720 BUG_ON(!S_ISREG(inode->i_mode)); 721 722 error = inode_newsize_ok(inode, attr->ia_size); 723 if (error) 724 return error; 725 726 if (attr->ia_size == oldsize) 727 attr->ia_valid &= ~ATTR_SIZE; 728 } 729 730 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) { 731 spin_lock(&inode->i_lock); 732 if (attr->ia_valid & ATTR_MTIME_SET) { 733 if (uid_eq(task_uid, owner_uid)) { 734 nfs_set_timestamps_to_ts(inode, attr); 735 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET| 736 ATTR_ATIME|ATTR_ATIME_SET); 737 } 738 } else { 739 if (attr->ia_valid & ATTR_MTIME) 740 nfs_update_mtime(inode); 741 if (attr->ia_valid & ATTR_ATIME) 742 nfs_update_atime(inode); 743 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME); 744 } 745 spin_unlock(&inode->i_lock); 746 } else if (nfs_have_delegated_atime(inode) && 747 attr->ia_valid & ATTR_ATIME && 748 !(attr->ia_valid & ATTR_MTIME)) { 749 if (!(attr->ia_valid & ATTR_ATIME_SET)) { 750 nfs_update_delegated_atime(inode); 751 attr->ia_valid &= ~ATTR_ATIME; 752 } 753 } 754 755 /* Optimization: if the end result is no change, don't RPC */ 756 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0) 757 return 0; 758 759 trace_nfs_setattr_enter(inode); 760 761 /* Write all dirty data */ 762 if (S_ISREG(inode->i_mode)) 763 nfs_sync_inode(inode); 764 765 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 766 if (fattr == NULL) { 767 error = -ENOMEM; 768 goto out; 769 } 770 771 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 772 if (error == 0) { 773 if (attr->ia_valid & ATTR_SIZE) 774 nfs_truncate_last_folio(inode->i_mapping, oldsize, 775 attr->ia_size); 776 error = nfs_refresh_inode(inode, fattr); 777 } 778 nfs_free_fattr(fattr); 779 out: 780 trace_nfs_setattr_exit(inode, error); 781 return error; 782 } 783 EXPORT_SYMBOL_GPL(nfs_setattr); 784 785 /** 786 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 787 * @inode: inode of the file used 788 * @offset: file offset to start truncating 789 * 790 * This is a copy of the common vmtruncate, but with the locking 791 * corrected to take into account the fact that NFS requires 792 * inode->i_size to be updated under the inode->i_lock. 793 * Note: must be called with inode->i_lock held! 794 */ 795 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 796 { 797 int err; 798 799 err = inode_newsize_ok(inode, offset); 800 if (err) 801 goto out; 802 803 trace_nfs_size_truncate(inode, offset); 804 i_size_write(inode, offset); 805 /* Optimisation */ 806 if (offset == 0) { 807 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 808 nfs_ooo_clear(NFS_I(inode)); 809 } 810 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 811 812 spin_unlock(&inode->i_lock); 813 truncate_pagecache(inode, offset); 814 nfs_update_delegated_mtime_locked(inode); 815 spin_lock(&inode->i_lock); 816 out: 817 return err; 818 } 819 820 /** 821 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 822 * @inode: pointer to struct inode 823 * @attr: pointer to struct iattr 824 * @fattr: pointer to struct nfs_fattr 825 * 826 * Note: we do this in the *proc.c in order to ensure that 827 * it works for things like exclusive creates too. 828 */ 829 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 830 struct nfs_fattr *fattr) 831 { 832 /* Barrier: bump the attribute generation count. */ 833 nfs_fattr_set_barrier(fattr); 834 835 spin_lock(&inode->i_lock); 836 NFS_I(inode)->attr_gencount = fattr->gencount; 837 if ((attr->ia_valid & ATTR_SIZE) != 0) { 838 if (!nfs_have_delegated_mtime(inode)) 839 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 840 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 841 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 842 nfs_vmtruncate(inode, attr->ia_size); 843 } 844 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 845 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; 846 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 && 847 inode->i_mode & S_ISUID) 848 inode->i_mode &= ~S_ISUID; 849 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode)) 850 inode->i_mode &= ~S_ISGID; 851 if ((attr->ia_valid & ATTR_MODE) != 0) { 852 int mode = attr->ia_mode & S_IALLUGO; 853 mode |= inode->i_mode & ~S_IALLUGO; 854 inode->i_mode = mode; 855 } 856 if ((attr->ia_valid & ATTR_UID) != 0) 857 inode->i_uid = attr->ia_uid; 858 if ((attr->ia_valid & ATTR_GID) != 0) 859 inode->i_gid = attr->ia_gid; 860 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 861 inode_set_ctime_to_ts(inode, fattr->ctime); 862 else 863 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 864 | NFS_INO_INVALID_CTIME); 865 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 866 | NFS_INO_INVALID_ACL); 867 } 868 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { 869 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME 870 | NFS_INO_INVALID_CTIME); 871 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 872 inode_set_atime_to_ts(inode, fattr->atime); 873 else if (attr->ia_valid & ATTR_ATIME_SET) 874 inode_set_atime_to_ts(inode, attr->ia_atime); 875 else 876 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 877 878 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 879 inode_set_ctime_to_ts(inode, fattr->ctime); 880 else 881 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 882 | NFS_INO_INVALID_CTIME); 883 } 884 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { 885 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME 886 | NFS_INO_INVALID_CTIME); 887 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 888 inode_set_mtime_to_ts(inode, fattr->mtime); 889 else if (attr->ia_valid & ATTR_MTIME_SET) 890 inode_set_mtime_to_ts(inode, attr->ia_mtime); 891 else 892 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 893 894 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 895 inode_set_ctime_to_ts(inode, fattr->ctime); 896 else 897 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 898 | NFS_INO_INVALID_CTIME); 899 } 900 if (fattr->valid) 901 nfs_update_inode(inode, fattr); 902 spin_unlock(&inode->i_lock); 903 } 904 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 905 906 /* 907 * Don't request help from readdirplus if the file is being written to, 908 * or if attribute caching is turned off 909 */ 910 static bool nfs_getattr_readdirplus_enable(const struct inode *inode) 911 { 912 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) && 913 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ; 914 } 915 916 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) 917 { 918 if (!IS_ROOT(dentry)) { 919 struct dentry *parent = dget_parent(dentry); 920 nfs_readdir_record_entry_cache_miss(d_inode(parent)); 921 dput(parent); 922 } 923 } 924 925 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) 926 { 927 if (!IS_ROOT(dentry)) { 928 struct dentry *parent = dget_parent(dentry); 929 nfs_readdir_record_entry_cache_hit(d_inode(parent)); 930 dput(parent); 931 } 932 } 933 934 static u32 nfs_get_valid_attrmask(struct inode *inode) 935 { 936 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid; 937 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 938 u32 reply_mask = STATX_INO | STATX_TYPE; 939 940 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 941 reply_mask |= STATX_ATIME; 942 if (!(cache_validity & NFS_INO_INVALID_CTIME)) 943 reply_mask |= STATX_CTIME; 944 if (!(cache_validity & NFS_INO_INVALID_MTIME)) 945 reply_mask |= STATX_MTIME; 946 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 947 reply_mask |= STATX_SIZE; 948 if (!(cache_validity & NFS_INO_INVALID_NLINK)) 949 reply_mask |= STATX_NLINK; 950 if (!(cache_validity & NFS_INO_INVALID_MODE)) 951 reply_mask |= STATX_MODE; 952 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 953 reply_mask |= STATX_UID | STATX_GID; 954 if (!(cache_validity & NFS_INO_INVALID_BLOCKS)) 955 reply_mask |= STATX_BLOCKS; 956 if (!(cache_validity & NFS_INO_INVALID_BTIME) && 957 (fattr_valid & NFS_ATTR_FATTR_BTIME)) 958 reply_mask |= STATX_BTIME; 959 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 960 reply_mask |= STATX_CHANGE_COOKIE; 961 return reply_mask; 962 } 963 964 int nfs_getattr(const struct mnt_idmap *idmap, const struct path *path, 965 struct kstat *stat, u32 request_mask, unsigned int query_flags) 966 { 967 struct inode *inode = d_inode(path->dentry); 968 struct nfs_server *server = NFS_SERVER(inode); 969 u64 fattr_valid = server->fattr_valid; 970 unsigned long cache_validity; 971 int err = 0; 972 bool force_sync = query_flags & AT_STATX_FORCE_SYNC; 973 bool do_update = false; 974 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode); 975 976 trace_nfs_getattr_enter(inode); 977 978 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID | 979 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME | 980 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME | 981 STATX_CHANGE_COOKIE; 982 983 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME)) 984 request_mask &= ~STATX_BTIME; 985 986 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) { 987 if (readdirplus_enabled) 988 nfs_readdirplus_parent_cache_hit(path->dentry); 989 goto out_no_revalidate; 990 } 991 992 /* Flush out writes to the server in order to update c/mtime/version. */ 993 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) && 994 S_ISREG(inode->i_mode)) { 995 if (nfs_have_delegated_mtime(inode)) 996 filemap_fdatawrite(inode->i_mapping); 997 else 998 filemap_write_and_wait(inode->i_mapping); 999 } 1000 1001 /* 1002 * We may force a getattr if the user cares about atime. 1003 * 1004 * Note that we only have to check the vfsmount flags here: 1005 * - NFS always sets S_NOATIME by so checking it would give a 1006 * bogus result 1007 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is 1008 * no point in checking those. 1009 */ 1010 if ((path->mnt->mnt_flags & MNT_NOATIME) || 1011 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 1012 request_mask &= ~STATX_ATIME; 1013 1014 /* Is the user requesting attributes that might need revalidation? */ 1015 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| 1016 STATX_MTIME|STATX_UID|STATX_GID| 1017 STATX_SIZE|STATX_BLOCKS|STATX_BTIME| 1018 STATX_CHANGE_COOKIE))) 1019 goto out_no_revalidate; 1020 1021 /* Check whether the cached attributes are stale */ 1022 do_update |= force_sync || nfs_attribute_cache_expired(inode); 1023 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 1024 do_update |= cache_validity & NFS_INO_INVALID_CHANGE; 1025 if (request_mask & STATX_ATIME) 1026 do_update |= cache_validity & NFS_INO_INVALID_ATIME; 1027 if (request_mask & STATX_CTIME) 1028 do_update |= cache_validity & NFS_INO_INVALID_CTIME; 1029 if (request_mask & STATX_MTIME) 1030 do_update |= cache_validity & NFS_INO_INVALID_MTIME; 1031 if (request_mask & STATX_SIZE) 1032 do_update |= cache_validity & NFS_INO_INVALID_SIZE; 1033 if (request_mask & STATX_NLINK) 1034 do_update |= cache_validity & NFS_INO_INVALID_NLINK; 1035 if (request_mask & STATX_MODE) 1036 do_update |= cache_validity & NFS_INO_INVALID_MODE; 1037 if (request_mask & (STATX_UID | STATX_GID)) 1038 do_update |= cache_validity & NFS_INO_INVALID_OTHER; 1039 if (request_mask & STATX_BLOCKS) 1040 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS; 1041 if (request_mask & STATX_BTIME) 1042 do_update |= cache_validity & NFS_INO_INVALID_BTIME; 1043 1044 if (do_update) { 1045 if (readdirplus_enabled) 1046 nfs_readdirplus_parent_cache_miss(path->dentry); 1047 err = __nfs_revalidate_inode(server, inode); 1048 if (err) 1049 goto out; 1050 } else if (readdirplus_enabled) 1051 nfs_readdirplus_parent_cache_hit(path->dentry); 1052 out_no_revalidate: 1053 /* Only return attributes that were revalidated. */ 1054 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask; 1055 1056 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 1057 stat->change_cookie = inode_peek_iversion_raw(inode); 1058 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC; 1059 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED) 1060 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; 1061 if (S_ISDIR(inode->i_mode)) 1062 stat->blksize = NFS_SERVER(inode)->dtsize; 1063 stat->btime = NFS_I(inode)->btime; 1064 1065 /* Special handling for STATX_DIOALIGN and STATX_DIO_READ_ALIGN 1066 * - NFS doesn't have DIO alignment constraints, avoid getting 1067 * these DIO attrs from remote and just respond with most 1068 * accommodating limits (so client will issue supported DIO). 1069 * - this is unintuitive, but the most coarse-grained 1070 * dio_offset_align is the most accommodating. 1071 */ 1072 if ((request_mask & (STATX_DIOALIGN | STATX_DIO_READ_ALIGN)) && 1073 S_ISREG(inode->i_mode)) { 1074 stat->result_mask |= STATX_DIOALIGN | STATX_DIO_READ_ALIGN; 1075 stat->dio_mem_align = 4; /* 4-byte alignment */ 1076 stat->dio_offset_align = PAGE_SIZE; 1077 stat->dio_read_offset_align = stat->dio_offset_align; 1078 } 1079 out: 1080 trace_nfs_getattr_exit(inode, err); 1081 return err; 1082 } 1083 EXPORT_SYMBOL_GPL(nfs_getattr); 1084 1085 int nfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa) 1086 { 1087 struct inode *inode = d_inode(dentry); 1088 1089 if (nfs_server_capable(inode, NFS_CAP_CASE_INSENSITIVE)) { 1090 fa->fsx_xflags |= FS_XFLAG_CASEFOLD; 1091 fa->flags |= FS_CASEFOLD_FL; 1092 } 1093 if (nfs_server_capable(inode, NFS_CAP_CASE_NONPRESERVING)) 1094 fa->fsx_xflags |= FS_XFLAG_CASENONPRESERVING; 1095 return 0; 1096 } 1097 EXPORT_SYMBOL_GPL(nfs_fileattr_get); 1098 1099 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 1100 { 1101 refcount_set(&l_ctx->count, 1); 1102 l_ctx->lockowner = current->files; 1103 INIT_LIST_HEAD(&l_ctx->list); 1104 atomic_set(&l_ctx->io_count, 0); 1105 } 1106 1107 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 1108 { 1109 struct nfs_lock_context *pos; 1110 1111 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { 1112 if (pos->lockowner != current->files) 1113 continue; 1114 if (refcount_inc_not_zero(&pos->count)) 1115 return pos; 1116 } 1117 return NULL; 1118 } 1119 1120 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 1121 { 1122 struct nfs_lock_context *res, *new = NULL; 1123 struct inode *inode = d_inode(ctx->dentry); 1124 1125 rcu_read_lock(); 1126 res = __nfs_find_lock_context(ctx); 1127 rcu_read_unlock(); 1128 if (res == NULL) { 1129 new = kmalloc_obj(*new, GFP_KERNEL_ACCOUNT); 1130 if (new == NULL) 1131 return ERR_PTR(-ENOMEM); 1132 nfs_init_lock_context(new); 1133 spin_lock(&inode->i_lock); 1134 res = __nfs_find_lock_context(ctx); 1135 if (res == NULL) { 1136 new->open_context = get_nfs_open_context(ctx); 1137 if (new->open_context) { 1138 list_add_tail_rcu(&new->list, 1139 &ctx->lock_context.list); 1140 res = new; 1141 new = NULL; 1142 } else 1143 res = ERR_PTR(-EBADF); 1144 } 1145 spin_unlock(&inode->i_lock); 1146 kfree(new); 1147 } 1148 return res; 1149 } 1150 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 1151 1152 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 1153 { 1154 struct nfs_open_context *ctx = l_ctx->open_context; 1155 struct inode *inode = d_inode(ctx->dentry); 1156 1157 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) 1158 return; 1159 list_del_rcu(&l_ctx->list); 1160 spin_unlock(&inode->i_lock); 1161 put_nfs_open_context(ctx); 1162 kfree_rcu(l_ctx, rcu_head); 1163 } 1164 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 1165 1166 /** 1167 * nfs_close_context - Common close_context() routine NFSv2/v3 1168 * @ctx: pointer to context 1169 * @is_sync: is this a synchronous close 1170 * 1171 * Ensure that the attributes are up to date if we're mounted 1172 * with close-to-open semantics and we have cached data that will 1173 * need to be revalidated on open. 1174 */ 1175 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 1176 { 1177 struct nfs_inode *nfsi; 1178 struct inode *inode; 1179 1180 if (!(ctx->mode & FMODE_WRITE)) 1181 return; 1182 if (!is_sync) 1183 return; 1184 inode = d_inode(ctx->dentry); 1185 if (nfs_have_read_or_write_delegation(inode)) 1186 return; 1187 nfsi = NFS_I(inode); 1188 if (inode->i_mapping->nrpages == 0) 1189 return; 1190 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1191 return; 1192 if (!list_empty(&nfsi->open_files)) 1193 return; 1194 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO) 1195 return; 1196 nfs_revalidate_inode(inode, 1197 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); 1198 } 1199 EXPORT_SYMBOL_GPL(nfs_close_context); 1200 1201 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 1202 fmode_t f_mode, 1203 struct file *filp) 1204 { 1205 struct nfs_open_context *ctx; 1206 1207 ctx = kmalloc_obj(*ctx, GFP_KERNEL_ACCOUNT); 1208 if (!ctx) 1209 return ERR_PTR(-ENOMEM); 1210 nfs_sb_active(dentry->d_sb); 1211 ctx->dentry = dget(dentry); 1212 if (filp) 1213 ctx->cred = get_cred(filp->f_cred); 1214 else 1215 ctx->cred = get_current_cred(); 1216 rcu_assign_pointer(ctx->ll_cred, NULL); 1217 ctx->state = NULL; 1218 ctx->mode = f_mode; 1219 ctx->flags = 0; 1220 ctx->error = 0; 1221 ctx->flock_owner = (fl_owner_t)filp; 1222 nfs_init_lock_context(&ctx->lock_context); 1223 ctx->lock_context.open_context = ctx; 1224 INIT_LIST_HEAD(&ctx->list); 1225 ctx->mdsthreshold = NULL; 1226 nfs_localio_file_init(&ctx->nfl); 1227 1228 return ctx; 1229 } 1230 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 1231 1232 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 1233 { 1234 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) 1235 return ctx; 1236 return NULL; 1237 } 1238 EXPORT_SYMBOL_GPL(get_nfs_open_context); 1239 1240 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 1241 { 1242 struct inode *inode = d_inode(ctx->dentry); 1243 struct super_block *sb = ctx->dentry->d_sb; 1244 1245 if (!refcount_dec_and_test(&ctx->lock_context.count)) 1246 return; 1247 if (!list_empty(&ctx->list)) { 1248 spin_lock(&inode->i_lock); 1249 list_del_rcu(&ctx->list); 1250 spin_unlock(&inode->i_lock); 1251 } 1252 if (inode != NULL) 1253 NFS_PROTO(inode)->close_context(ctx, is_sync); 1254 put_cred(ctx->cred); 1255 dput(ctx->dentry); 1256 nfs_sb_deactive(sb); 1257 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1)); 1258 kfree(ctx->mdsthreshold); 1259 nfs_close_local_fh(&ctx->nfl); 1260 kfree_rcu(ctx, rcu_head); 1261 } 1262 1263 void put_nfs_open_context(struct nfs_open_context *ctx) 1264 { 1265 __put_nfs_open_context(ctx, 0); 1266 } 1267 EXPORT_SYMBOL_GPL(put_nfs_open_context); 1268 1269 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 1270 { 1271 __put_nfs_open_context(ctx, 1); 1272 } 1273 1274 /* 1275 * Ensure that mmap has a recent RPC credential for use when writing out 1276 * shared pages 1277 */ 1278 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 1279 { 1280 struct inode *inode = d_inode(ctx->dentry); 1281 struct nfs_inode *nfsi = NFS_I(inode); 1282 1283 spin_lock(&inode->i_lock); 1284 if (list_empty(&nfsi->open_files) && 1285 nfs_ooo_test(nfsi)) 1286 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA | 1287 NFS_INO_REVAL_FORCED); 1288 list_add_tail_rcu(&ctx->list, &nfsi->open_files); 1289 spin_unlock(&inode->i_lock); 1290 } 1291 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 1292 1293 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 1294 { 1295 filp->private_data = get_nfs_open_context(ctx); 1296 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); 1297 if (list_empty(&ctx->list)) 1298 nfs_inode_attach_open_context(ctx); 1299 } 1300 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 1301 1302 /* 1303 * Given an inode, search for an open context with the desired characteristics 1304 */ 1305 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) 1306 { 1307 struct nfs_inode *nfsi = NFS_I(inode); 1308 struct nfs_open_context *pos, *ctx = NULL; 1309 1310 rcu_read_lock(); 1311 list_for_each_entry_rcu(pos, &nfsi->open_files, list) { 1312 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0) 1313 continue; 1314 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 1315 continue; 1316 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags)) 1317 continue; 1318 ctx = get_nfs_open_context(pos); 1319 if (ctx) 1320 break; 1321 } 1322 rcu_read_unlock(); 1323 return ctx; 1324 } 1325 1326 void nfs_file_clear_open_context(struct file *filp) 1327 { 1328 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1329 1330 if (ctx) { 1331 struct inode *inode = d_inode(ctx->dentry); 1332 1333 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); 1334 /* 1335 * We fatal error on write before. Try to writeback 1336 * every page again. 1337 */ 1338 if (ctx->error < 0) 1339 invalidate_inode_pages2(inode->i_mapping); 1340 filp->private_data = NULL; 1341 put_nfs_open_context_sync(ctx); 1342 } 1343 } 1344 1345 /* 1346 * These allocate and release file read/write context information. 1347 */ 1348 int nfs_open(struct inode *inode, struct file *filp) 1349 { 1350 struct nfs_open_context *ctx; 1351 1352 ctx = alloc_nfs_open_context(file_dentry(filp), 1353 flags_to_mode(filp->f_flags), filp); 1354 if (IS_ERR(ctx)) 1355 return PTR_ERR(ctx); 1356 nfs_file_set_open_context(filp, ctx); 1357 put_nfs_open_context(ctx); 1358 nfs_fscache_open_file(inode, filp); 1359 return 0; 1360 } 1361 1362 /* 1363 * This function is called whenever some part of NFS notices that 1364 * the cached attributes have to be refreshed. 1365 */ 1366 int 1367 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1368 { 1369 int status = -ESTALE; 1370 struct nfs_fattr *fattr = NULL; 1371 struct nfs_inode *nfsi = NFS_I(inode); 1372 1373 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1374 inode->i_sb->s_id, (unsigned long long)inode->i_ino); 1375 1376 trace_nfs_revalidate_inode_enter(inode); 1377 1378 if (is_bad_inode(inode)) 1379 goto out; 1380 if (NFS_STALE(inode)) 1381 goto out; 1382 1383 /* pNFS: Attributes aren't updated until we layoutcommit */ 1384 if (S_ISREG(inode->i_mode)) { 1385 status = pnfs_sync_inode(inode, false); 1386 if (status) 1387 goto out; 1388 } else if (nfs_have_directory_delegation(inode) && 1389 !(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)) { 1390 status = 0; 1391 goto out; 1392 } 1393 1394 status = -ENOMEM; 1395 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 1396 if (fattr == NULL) 1397 goto out; 1398 1399 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1400 1401 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode); 1402 if (status != 0) { 1403 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1404 inode->i_sb->s_id, 1405 (unsigned long long)inode->i_ino, status); 1406 switch (status) { 1407 case -ETIMEDOUT: 1408 /* A soft timeout occurred. Use cached information? */ 1409 if (server->flags & NFS_MOUNT_SOFTREVAL) 1410 status = 0; 1411 break; 1412 case -ESTALE: 1413 if (!S_ISDIR(inode->i_mode)) 1414 nfs_set_inode_stale(inode); 1415 else 1416 nfs_zap_caches(inode); 1417 } 1418 goto out; 1419 } 1420 1421 status = nfs_refresh_inode(inode, fattr); 1422 if (status) { 1423 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1424 inode->i_sb->s_id, 1425 (unsigned long long)inode->i_ino, status); 1426 goto out; 1427 } 1428 1429 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1430 nfs_zap_acl_cache(inode); 1431 1432 nfs_setsecurity(inode, fattr); 1433 1434 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1435 inode->i_sb->s_id, 1436 (unsigned long long)inode->i_ino); 1437 1438 out: 1439 nfs_free_fattr(fattr); 1440 trace_nfs_revalidate_inode_exit(inode, status); 1441 return status; 1442 } 1443 1444 int nfs_attribute_cache_expired(struct inode *inode) 1445 { 1446 if (nfs_have_delegated_attributes(inode)) 1447 return 0; 1448 return nfs_attribute_timeout(inode); 1449 } 1450 1451 /** 1452 * nfs_revalidate_inode - Revalidate the inode attributes 1453 * @inode: pointer to inode struct 1454 * @flags: cache flags to check 1455 * 1456 * Updates inode attribute information by retrieving the data from the server. 1457 */ 1458 int nfs_revalidate_inode(struct inode *inode, unsigned long flags) 1459 { 1460 if (!nfs_check_cache_invalid(inode, flags)) 1461 return NFS_STALE(inode) ? -ESTALE : 0; 1462 return __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1463 } 1464 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1465 1466 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1467 { 1468 int ret; 1469 1470 nfs_fscache_invalidate(inode, 0); 1471 if (mapping->nrpages != 0) { 1472 if (S_ISREG(inode->i_mode)) { 1473 ret = nfs_sync_mapping(mapping); 1474 if (ret < 0) 1475 return ret; 1476 } 1477 ret = invalidate_inode_pages2(mapping); 1478 if (ret < 0) 1479 return ret; 1480 } 1481 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1482 1483 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1484 inode->i_sb->s_id, 1485 (unsigned long long)inode->i_ino); 1486 return 0; 1487 } 1488 1489 /** 1490 * nfs_clear_invalid_mapping - Conditionally clear a mapping 1491 * @mapping: pointer to mapping 1492 * 1493 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping. 1494 */ 1495 int nfs_clear_invalid_mapping(struct address_space *mapping) 1496 { 1497 struct inode *inode = mapping->host; 1498 struct nfs_inode *nfsi = NFS_I(inode); 1499 unsigned long *bitlock = &nfsi->flags; 1500 int ret = 0; 1501 1502 /* 1503 * We must clear NFS_INO_INVALID_DATA first to ensure that 1504 * invalidations that come in while we're shooting down the mappings 1505 * are respected. But, that leaves a race window where one revalidator 1506 * can clear the flag, and then another checks it before the mapping 1507 * gets invalidated. Fix that by serializing access to this part of 1508 * the function. 1509 * 1510 * At the same time, we need to allow other tasks to see whether we 1511 * might be in the middle of invalidating the pages, so we only set 1512 * the bit lock here if it looks like we're going to be doing that. 1513 */ 1514 for (;;) { 1515 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1516 nfs_wait_bit_killable, 1517 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 1518 if (ret) 1519 goto out; 1520 smp_rmb(); /* pairs with smp_wmb() below */ 1521 if (test_bit(NFS_INO_INVALIDATING, bitlock)) 1522 continue; 1523 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */ 1524 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA)) 1525 goto out; 1526 /* Slow-path that double-checks with spinlock held */ 1527 spin_lock(&inode->i_lock); 1528 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1529 spin_unlock(&inode->i_lock); 1530 continue; 1531 } 1532 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1533 break; 1534 spin_unlock(&inode->i_lock); 1535 goto out; 1536 } 1537 1538 set_bit(NFS_INO_INVALIDATING, bitlock); 1539 smp_wmb(); 1540 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1541 nfs_ooo_clear(nfsi); 1542 spin_unlock(&inode->i_lock); 1543 trace_nfs_invalidate_mapping_enter(inode); 1544 ret = nfs_invalidate_mapping(inode, mapping); 1545 trace_nfs_invalidate_mapping_exit(inode, ret); 1546 1547 clear_and_wake_up_bit(NFS_INO_INVALIDATING, bitlock); 1548 out: 1549 return ret; 1550 } 1551 1552 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1553 { 1554 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) || 1555 NFS_STALE(inode); 1556 } 1557 1558 int nfs_revalidate_mapping_rcu(struct inode *inode) 1559 { 1560 struct nfs_inode *nfsi = NFS_I(inode); 1561 unsigned long *bitlock = &nfsi->flags; 1562 int ret = 0; 1563 1564 if (IS_SWAPFILE(inode)) 1565 goto out; 1566 if (nfs_mapping_need_revalidate_inode(inode)) { 1567 ret = -ECHILD; 1568 goto out; 1569 } 1570 spin_lock(&inode->i_lock); 1571 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1572 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1573 ret = -ECHILD; 1574 spin_unlock(&inode->i_lock); 1575 out: 1576 return ret; 1577 } 1578 1579 /** 1580 * nfs_revalidate_mapping - Revalidate the pagecache 1581 * @inode: pointer to host inode 1582 * @mapping: pointer to mapping 1583 */ 1584 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1585 { 1586 /* swapfiles are not supposed to be shared. */ 1587 if (IS_SWAPFILE(inode)) 1588 return 0; 1589 1590 if (nfs_mapping_need_revalidate_inode(inode)) { 1591 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1592 if (ret < 0) 1593 return ret; 1594 } 1595 1596 return nfs_clear_invalid_mapping(mapping); 1597 } 1598 1599 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1600 { 1601 struct inode *inode = &nfsi->vfs_inode; 1602 1603 if (!S_ISREG(inode->i_mode)) 1604 return false; 1605 if (list_empty(&nfsi->open_files)) 1606 return false; 1607 return inode_is_open_for_write(inode); 1608 } 1609 1610 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1611 { 1612 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1613 } 1614 1615 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1616 { 1617 struct timespec64 ts; 1618 1619 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1620 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1621 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { 1622 inode_set_iversion_raw(inode, fattr->change_attr); 1623 if (S_ISDIR(inode->i_mode)) 1624 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1625 else if (nfs_server_capable(inode, NFS_CAP_XATTR)) 1626 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); 1627 } 1628 /* If we have atomic WCC data, we may update some attributes */ 1629 ts = inode_get_ctime(inode); 1630 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1631 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1632 && timespec64_equal(&ts, &fattr->pre_ctime)) { 1633 inode_set_ctime_to_ts(inode, fattr->ctime); 1634 } 1635 1636 ts = inode_get_mtime(inode); 1637 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1638 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1639 && timespec64_equal(&ts, &fattr->pre_mtime)) { 1640 inode_set_mtime_to_ts(inode, fattr->mtime); 1641 } 1642 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1643 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1644 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1645 && !nfs_have_writebacks(inode)) { 1646 trace_nfs_size_wcc(inode, fattr->size); 1647 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1648 } 1649 } 1650 1651 /** 1652 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1653 * @inode: pointer to inode 1654 * @fattr: updated attributes 1655 * 1656 * Verifies the attribute cache. If we have just changed the attributes, 1657 * so that fattr carries weak cache consistency data, then it may 1658 * also update the ctime/mtime/change_attribute. 1659 */ 1660 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1661 { 1662 struct nfs_inode *nfsi = NFS_I(inode); 1663 loff_t cur_size, new_isize; 1664 unsigned long invalid = 0; 1665 struct timespec64 ts; 1666 1667 if (nfs_have_delegated_attributes(inode)) 1668 return 0; 1669 1670 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 1671 /* Only a mounted-on-fileid? Just exit */ 1672 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1673 return 0; 1674 /* Has the inode gone and changed behind our back? */ 1675 } else if (inode->i_ino != fattr->fileid) { 1676 /* Is this perhaps the mounted-on fileid? */ 1677 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 1678 inode->i_ino == fattr->mounted_on_fileid) 1679 return 0; 1680 return -ESTALE; 1681 } 1682 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) 1683 return -ESTALE; 1684 1685 1686 if (!nfs_file_has_buffered_writers(nfsi)) { 1687 /* Verify a few of the more important attributes */ 1688 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) 1689 invalid |= NFS_INO_INVALID_CHANGE; 1690 1691 ts = inode_get_mtime(inode); 1692 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) 1693 invalid |= NFS_INO_INVALID_MTIME; 1694 1695 ts = inode_get_ctime(inode); 1696 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime)) 1697 invalid |= NFS_INO_INVALID_CTIME; 1698 1699 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1700 cur_size = i_size_read(inode); 1701 new_isize = nfs_size_to_loff_t(fattr->size); 1702 if (cur_size != new_isize) 1703 invalid |= NFS_INO_INVALID_SIZE; 1704 } 1705 } 1706 1707 /* Have any file permissions changed? */ 1708 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1709 invalid |= NFS_INO_INVALID_MODE; 1710 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1711 invalid |= NFS_INO_INVALID_OTHER; 1712 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1713 invalid |= NFS_INO_INVALID_OTHER; 1714 1715 /* Has the link count changed? */ 1716 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1717 invalid |= NFS_INO_INVALID_NLINK; 1718 1719 ts = inode_get_atime(inode); 1720 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime)) 1721 invalid |= NFS_INO_INVALID_ATIME; 1722 1723 if (invalid != 0) 1724 nfs_set_cache_invalid(inode, invalid); 1725 1726 nfsi->read_cache_jiffies = fattr->time_start; 1727 return 0; 1728 } 1729 1730 static atomic_long_t nfs_attr_generation_counter; 1731 1732 static unsigned long nfs_read_attr_generation_counter(void) 1733 { 1734 return atomic_long_read(&nfs_attr_generation_counter); 1735 } 1736 1737 unsigned long nfs_inc_attr_generation_counter(void) 1738 { 1739 return atomic_long_inc_return(&nfs_attr_generation_counter); 1740 } 1741 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1742 1743 void nfs_fattr_init(struct nfs_fattr *fattr) 1744 { 1745 fattr->valid = 0; 1746 fattr->time_start = jiffies; 1747 fattr->gencount = nfs_inc_attr_generation_counter(); 1748 fattr->owner_name = NULL; 1749 fattr->group_name = NULL; 1750 fattr->mdsthreshold = NULL; 1751 } 1752 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1753 1754 /** 1755 * nfs_fattr_set_barrier 1756 * @fattr: attributes 1757 * 1758 * Used to set a barrier after an attribute was updated. This 1759 * barrier ensures that older attributes from RPC calls that may 1760 * have raced with our update cannot clobber these new values. 1761 * Note that you are still responsible for ensuring that other 1762 * operations which change the attribute on the server do not 1763 * collide. 1764 */ 1765 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1766 { 1767 fattr->gencount = nfs_inc_attr_generation_counter(); 1768 } 1769 1770 struct nfs_fattr *nfs_alloc_fattr(void) 1771 { 1772 struct nfs_fattr *fattr; 1773 1774 fattr = kmalloc_obj(*fattr); 1775 if (fattr != NULL) { 1776 nfs_fattr_init(fattr); 1777 fattr->label = NULL; 1778 } 1779 return fattr; 1780 } 1781 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1782 1783 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server) 1784 { 1785 struct nfs_fattr *fattr = nfs_alloc_fattr(); 1786 1787 if (!fattr) 1788 return NULL; 1789 1790 fattr->label = nfs4_label_alloc(server, GFP_KERNEL); 1791 if (IS_ERR(fattr->label)) { 1792 kfree(fattr); 1793 return NULL; 1794 } 1795 1796 return fattr; 1797 } 1798 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label); 1799 1800 struct nfs_fh *nfs_alloc_fhandle(void) 1801 { 1802 struct nfs_fh *fh; 1803 1804 fh = kmalloc_obj(struct nfs_fh); 1805 if (fh != NULL) 1806 fh->size = 0; 1807 return fh; 1808 } 1809 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1810 1811 #ifdef NFS_DEBUG 1812 /* 1813 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1814 * in the same way that wireshark does 1815 * 1816 * @fh: file handle 1817 * 1818 * For debugging only. 1819 */ 1820 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1821 { 1822 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1823 * not on the result */ 1824 return nfs_fhandle_hash(fh); 1825 } 1826 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1827 1828 /* 1829 * _nfs_display_fhandle - display an NFS file handle on the console 1830 * 1831 * @fh: file handle to display 1832 * @caption: display caption 1833 * 1834 * For debugging only. 1835 */ 1836 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1837 { 1838 unsigned short i; 1839 1840 if (fh == NULL || fh->size == 0) { 1841 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1842 return; 1843 } 1844 1845 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1846 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1847 for (i = 0; i < fh->size; i += 16) { 1848 __be32 *pos = (__be32 *)&fh->data[i]; 1849 1850 switch ((fh->size - i - 1) >> 2) { 1851 case 0: 1852 printk(KERN_DEFAULT " %08x\n", 1853 be32_to_cpup(pos)); 1854 break; 1855 case 1: 1856 printk(KERN_DEFAULT " %08x %08x\n", 1857 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1858 break; 1859 case 2: 1860 printk(KERN_DEFAULT " %08x %08x %08x\n", 1861 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1862 be32_to_cpup(pos + 2)); 1863 break; 1864 default: 1865 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1866 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1867 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1868 } 1869 } 1870 } 1871 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1872 #endif 1873 1874 /** 1875 * nfs_inode_attrs_cmp_generic - compare attributes 1876 * @fattr: attributes 1877 * @inode: pointer to inode 1878 * 1879 * Attempt to divine whether or not an RPC call reply carrying stale 1880 * attributes got scheduled after another call carrying updated ones. 1881 * Note also the check for wraparound of 'attr_gencount' 1882 * 1883 * The function returns '1' if it thinks the attributes in @fattr are 1884 * more recent than the ones cached in @inode. Otherwise it returns 1885 * the value '0'. 1886 */ 1887 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr, 1888 const struct inode *inode) 1889 { 1890 unsigned long attr_gencount = NFS_I(inode)->attr_gencount; 1891 1892 return (long)(fattr->gencount - attr_gencount) > 0 || 1893 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; 1894 } 1895 1896 /** 1897 * nfs_inode_attrs_cmp_monotonic - compare attributes 1898 * @fattr: attributes 1899 * @inode: pointer to inode 1900 * 1901 * Attempt to divine whether or not an RPC call reply carrying stale 1902 * attributes got scheduled after another call carrying updated ones. 1903 * 1904 * We assume that the server observes monotonic semantics for 1905 * the change attribute, so a larger value means that the attributes in 1906 * @fattr are more recent, in which case the function returns the 1907 * value '1'. 1908 * A return value of '0' indicates no measurable change 1909 * A return value of '-1' means that the attributes in @inode are 1910 * more recent. 1911 */ 1912 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr, 1913 const struct inode *inode) 1914 { 1915 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode); 1916 if (diff > 0) 1917 return 1; 1918 return diff == 0 ? 0 : -1; 1919 } 1920 1921 /** 1922 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes 1923 * @fattr: attributes 1924 * @inode: pointer to inode 1925 * 1926 * Attempt to divine whether or not an RPC call reply carrying stale 1927 * attributes got scheduled after another call carrying updated ones. 1928 * 1929 * We assume that the server observes strictly monotonic semantics for 1930 * the change attribute, so a larger value means that the attributes in 1931 * @fattr are more recent, in which case the function returns the 1932 * value '1'. 1933 * A return value of '-1' means that the attributes in @inode are 1934 * more recent or unchanged. 1935 */ 1936 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr, 1937 const struct inode *inode) 1938 { 1939 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1; 1940 } 1941 1942 /** 1943 * nfs_inode_attrs_cmp - compare attributes 1944 * @fattr: attributes 1945 * @inode: pointer to inode 1946 * 1947 * This function returns '1' if it thinks the attributes in @fattr are 1948 * more recent than the ones cached in @inode. It returns '-1' if 1949 * the attributes in @inode are more recent than the ones in @fattr, 1950 * and it returns 0 if not sure. 1951 */ 1952 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr, 1953 const struct inode *inode) 1954 { 1955 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0) 1956 return 1; 1957 switch (NFS_SERVER(inode)->change_attr_type) { 1958 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1959 break; 1960 case NFS4_CHANGE_TYPE_IS_TIME_METADATA: 1961 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1962 break; 1963 return nfs_inode_attrs_cmp_monotonic(fattr, inode); 1964 default: 1965 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1966 break; 1967 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode); 1968 } 1969 return 0; 1970 } 1971 1972 /** 1973 * nfs_inode_finish_partial_attr_update - complete a previous inode update 1974 * @fattr: attributes 1975 * @inode: pointer to inode 1976 * 1977 * Returns '1' if the last attribute update left the inode cached 1978 * attributes in a partially unrevalidated state, and @fattr 1979 * matches the change attribute of that partial update. 1980 * Otherwise returns '0'. 1981 */ 1982 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr, 1983 const struct inode *inode) 1984 { 1985 const unsigned long check_valid = 1986 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME | 1987 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 1988 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER | 1989 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME | 1990 NFS_INO_INVALID_UNCACHEABLE_FILE_DATA; 1991 unsigned long cache_validity = NFS_I(inode)->cache_validity; 1992 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type; 1993 1994 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED && 1995 !(cache_validity & NFS_INO_INVALID_CHANGE) && 1996 (cache_validity & check_valid) != 0 && 1997 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1998 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0) 1999 return 1; 2000 return 0; 2001 } 2002 2003 static void nfs_ooo_merge(struct nfs_inode *nfsi, 2004 u64 start, u64 end) 2005 { 2006 int i, cnt; 2007 2008 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) 2009 /* No point merging anything */ 2010 return; 2011 2012 if (!nfsi->ooo) { 2013 nfsi->ooo = kmalloc_obj(*nfsi->ooo, GFP_ATOMIC); 2014 if (!nfsi->ooo) { 2015 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 2016 return; 2017 } 2018 nfsi->ooo->cnt = 0; 2019 } 2020 2021 /* add this range, merging if possible */ 2022 cnt = nfsi->ooo->cnt; 2023 for (i = 0; i < cnt; i++) { 2024 if (end == nfsi->ooo->gap[i].start) 2025 end = nfsi->ooo->gap[i].end; 2026 else if (start == nfsi->ooo->gap[i].end) 2027 start = nfsi->ooo->gap[i].start; 2028 else 2029 continue; 2030 /* Remove 'i' from table and loop to insert the new range */ 2031 cnt -= 1; 2032 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt]; 2033 i = -1; 2034 } 2035 if (start != end) { 2036 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) { 2037 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 2038 kfree(nfsi->ooo); 2039 nfsi->ooo = NULL; 2040 return; 2041 } 2042 nfsi->ooo->gap[cnt].start = start; 2043 nfsi->ooo->gap[cnt].end = end; 2044 cnt += 1; 2045 } 2046 nfsi->ooo->cnt = cnt; 2047 } 2048 2049 static void nfs_ooo_record(struct nfs_inode *nfsi, 2050 struct nfs_fattr *fattr) 2051 { 2052 /* This reply was out-of-order, so record in the 2053 * pre/post change id, possibly cancelling 2054 * gaps created when iversion was jumpped forward. 2055 */ 2056 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) && 2057 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) 2058 nfs_ooo_merge(nfsi, 2059 fattr->change_attr, 2060 fattr->pre_change_attr); 2061 } 2062 2063 static int nfs_refresh_inode_locked(struct inode *inode, 2064 struct nfs_fattr *fattr) 2065 { 2066 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 2067 int ret = 0; 2068 2069 trace_nfs_refresh_inode_enter(inode); 2070 2071 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode)) 2072 ret = nfs_update_inode(inode, fattr); 2073 else { 2074 nfs_ooo_record(NFS_I(inode), fattr); 2075 2076 if (attr_cmp == 0) 2077 ret = nfs_check_inode_attributes(inode, fattr); 2078 } 2079 2080 trace_nfs_refresh_inode_exit(inode, ret); 2081 return ret; 2082 } 2083 2084 /** 2085 * nfs_refresh_inode - try to update the inode attribute cache 2086 * @inode: pointer to inode 2087 * @fattr: updated attributes 2088 * 2089 * Check that an RPC call that returned attributes has not overlapped with 2090 * other recent updates of the inode metadata, then decide whether it is 2091 * safe to do a full update of the inode attributes, or whether just to 2092 * call nfs_check_inode_attributes. 2093 */ 2094 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 2095 { 2096 int status; 2097 2098 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 2099 return 0; 2100 spin_lock(&inode->i_lock); 2101 status = nfs_refresh_inode_locked(inode, fattr); 2102 spin_unlock(&inode->i_lock); 2103 2104 return status; 2105 } 2106 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 2107 2108 static int nfs_post_op_update_inode_locked(struct inode *inode, 2109 struct nfs_fattr *fattr, unsigned int invalid) 2110 { 2111 if (S_ISDIR(inode->i_mode)) 2112 invalid |= NFS_INO_INVALID_DATA; 2113 nfs_set_cache_invalid(inode, invalid); 2114 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 2115 return 0; 2116 return nfs_refresh_inode_locked(inode, fattr); 2117 } 2118 2119 /** 2120 * nfs_post_op_update_inode - try to update the inode attribute cache 2121 * @inode: pointer to inode 2122 * @fattr: updated attributes 2123 * 2124 * After an operation that has changed the inode metadata, mark the 2125 * attribute cache as being invalid, then try to update it. 2126 * 2127 * NB: if the server didn't return any post op attributes, this 2128 * function will force the retrieval of attributes before the next 2129 * NFS request. Thus it should be used only for operations that 2130 * are expected to change one or more attributes, to avoid 2131 * unnecessary NFS requests and trips through nfs_update_inode(). 2132 */ 2133 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 2134 { 2135 int status; 2136 2137 spin_lock(&inode->i_lock); 2138 nfs_fattr_set_barrier(fattr); 2139 status = nfs_post_op_update_inode_locked(inode, fattr, 2140 NFS_INO_INVALID_CHANGE 2141 | NFS_INO_INVALID_CTIME 2142 | NFS_INO_REVAL_FORCED); 2143 spin_unlock(&inode->i_lock); 2144 2145 return status; 2146 } 2147 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 2148 2149 /** 2150 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 2151 * @inode: pointer to inode 2152 * @fattr: updated attributes 2153 * 2154 * After an operation that has changed the inode metadata, mark the 2155 * attribute cache as being invalid, then try to update it. Fake up 2156 * weak cache consistency data, if none exist. 2157 * 2158 * This function is mainly designed to be used by the ->write_done() functions. 2159 */ 2160 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 2161 { 2162 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 2163 int status; 2164 2165 /* Don't do a WCC update if these attributes are already stale */ 2166 if (attr_cmp < 0) 2167 return 0; 2168 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) { 2169 /* Record the pre/post change info before clearing PRECHANGE */ 2170 nfs_ooo_record(NFS_I(inode), fattr); 2171 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 2172 | NFS_ATTR_FATTR_PRESIZE 2173 | NFS_ATTR_FATTR_PREMTIME 2174 | NFS_ATTR_FATTR_PRECTIME); 2175 goto out_noforce; 2176 } 2177 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 2178 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 2179 fattr->pre_change_attr = inode_peek_iversion_raw(inode); 2180 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 2181 } 2182 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 2183 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 2184 fattr->pre_ctime = inode_get_ctime(inode); 2185 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 2186 } 2187 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 2188 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 2189 fattr->pre_mtime = inode_get_mtime(inode); 2190 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 2191 } 2192 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 2193 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 2194 fattr->pre_size = i_size_read(inode); 2195 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 2196 } 2197 out_noforce: 2198 status = nfs_post_op_update_inode_locked(inode, fattr, 2199 NFS_INO_INVALID_CHANGE 2200 | NFS_INO_INVALID_CTIME 2201 | NFS_INO_INVALID_MTIME 2202 | NFS_INO_INVALID_BLOCKS); 2203 return status; 2204 } 2205 2206 /** 2207 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 2208 * @inode: pointer to inode 2209 * @fattr: updated attributes 2210 * 2211 * After an operation that has changed the inode metadata, mark the 2212 * attribute cache as being invalid, then try to update it. Fake up 2213 * weak cache consistency data, if none exist. 2214 * 2215 * This function is mainly designed to be used by the ->write_done() functions. 2216 */ 2217 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 2218 { 2219 int status; 2220 2221 spin_lock(&inode->i_lock); 2222 nfs_fattr_set_barrier(fattr); 2223 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 2224 spin_unlock(&inode->i_lock); 2225 return status; 2226 } 2227 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 2228 2229 2230 /* 2231 * Many nfs protocol calls return the new file attributes after 2232 * an operation. Here we update the inode to reflect the state 2233 * of the server's inode. 2234 * 2235 * This is a bit tricky because we have to make sure all dirty pages 2236 * have been sent off to the server before calling invalidate_inode_pages. 2237 * To make sure no other process adds more write requests while we try 2238 * our best to flush them, we make them sleep during the attribute refresh. 2239 * 2240 * A very similar scenario holds for the dir cache. 2241 */ 2242 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 2243 { 2244 struct nfs_server *server = NFS_SERVER(inode); 2245 struct nfs_inode *nfsi = NFS_I(inode); 2246 loff_t cur_isize, new_isize; 2247 u64 fattr_supported = server->fattr_valid; 2248 unsigned long invalid = 0; 2249 unsigned long now = jiffies; 2250 unsigned long save_cache_validity; 2251 bool have_writers = nfs_file_has_buffered_writers(nfsi); 2252 bool cache_revalidated = true; 2253 bool attr_changed = false; 2254 bool have_delegation; 2255 2256 dfprintk(VFS, "NFS: %s(%s/%llu fh_crc=0x%08x ct=%d info=0x%llx)\n", 2257 __func__, inode->i_sb->s_id, inode->i_ino, 2258 nfs_display_fhandle_hash(NFS_FH(inode)), 2259 icount_read_once(inode), fattr->valid); 2260 2261 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 2262 /* Only a mounted-on-fileid? Just exit */ 2263 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 2264 return 0; 2265 /* Has the inode gone and changed behind our back? */ 2266 } else if (inode->i_ino != fattr->fileid) { 2267 /* Is this perhaps the mounted-on fileid? */ 2268 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 2269 inode->i_ino == fattr->mounted_on_fileid) 2270 return 0; 2271 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 2272 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 2273 NFS_SERVER(inode)->nfs_client->cl_hostname, 2274 inode->i_sb->s_id, (long long)inode->i_ino, 2275 (long long)fattr->fileid); 2276 goto out_err; 2277 } 2278 2279 /* 2280 * Make sure the inode's type hasn't changed. 2281 */ 2282 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) { 2283 /* 2284 * Big trouble! The inode has become a different object. 2285 */ 2286 printk(KERN_DEBUG "NFS: %s: inode %llu mode changed, %07o to %07o\n", 2287 __func__, inode->i_ino, inode->i_mode, fattr->mode); 2288 goto out_err; 2289 } 2290 2291 /* Update the fsid? */ 2292 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 2293 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 2294 !IS_AUTOMOUNT(inode)) 2295 server->fsid = fattr->fsid; 2296 2297 /* Save the delegation state before clearing cache_validity */ 2298 have_delegation = nfs_have_delegated_attributes(inode); 2299 2300 /* 2301 * Update the read time so we don't revalidate too often. 2302 */ 2303 nfsi->read_cache_jiffies = fattr->time_start; 2304 2305 /* Fix up any delegated attributes in the struct nfs_fattr */ 2306 nfs_fattr_fixup_delegated(inode, fattr); 2307 2308 save_cache_validity = nfsi->cache_validity; 2309 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 2310 | NFS_INO_INVALID_ATIME 2311 | NFS_INO_REVAL_FORCED 2312 | NFS_INO_INVALID_BLOCKS 2313 | NFS_INO_INVALID_UNCACHEABLE_FILE_DATA); 2314 2315 /* Do atomic weak cache consistency updates */ 2316 nfs_wcc_update_inode(inode, fattr); 2317 2318 if (pnfs_layoutcommit_outstanding(inode)) { 2319 nfsi->cache_validity |= 2320 save_cache_validity & 2321 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 2322 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 2323 NFS_INO_INVALID_BLOCKS); 2324 cache_revalidated = false; 2325 } 2326 2327 /* More cache consistency checks */ 2328 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 2329 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 && 2330 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) { 2331 /* There is one remaining gap that hasn't been 2332 * merged into iversion - do that now. 2333 */ 2334 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start); 2335 kfree(nfsi->ooo); 2336 nfsi->ooo = NULL; 2337 } 2338 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { 2339 /* Could it be a race with writeback? */ 2340 if (!(have_writers || have_delegation)) { 2341 invalid |= NFS_INO_INVALID_DATA 2342 | NFS_INO_INVALID_ACCESS 2343 | NFS_INO_INVALID_ACL 2344 | NFS_INO_INVALID_XATTR; 2345 /* Force revalidate of all attributes */ 2346 save_cache_validity |= NFS_INO_INVALID_CTIME 2347 | NFS_INO_INVALID_MTIME 2348 | NFS_INO_INVALID_SIZE 2349 | NFS_INO_INVALID_BLOCKS 2350 | NFS_INO_INVALID_NLINK 2351 | NFS_INO_INVALID_MODE 2352 | NFS_INO_INVALID_OTHER 2353 | NFS_INO_INVALID_BTIME 2354 | NFS_INO_INVALID_UNCACHEABLE_FILE_DATA; 2355 if (S_ISDIR(inode->i_mode)) 2356 nfs_force_lookup_revalidate(inode); 2357 attr_changed = true; 2358 dprintk("NFS: change_attr change on server for file %s/%llu\n", 2359 inode->i_sb->s_id, 2360 inode->i_ino); 2361 } else if (!have_delegation) { 2362 nfs_ooo_record(nfsi, fattr); 2363 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode), 2364 fattr->change_attr); 2365 } 2366 inode_set_iversion_raw(inode, fattr->change_attr); 2367 } 2368 } else { 2369 nfsi->cache_validity |= 2370 save_cache_validity & NFS_INO_INVALID_CHANGE; 2371 if (!have_delegation || 2372 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0) 2373 cache_revalidated = false; 2374 } 2375 2376 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 2377 inode_set_mtime_to_ts(inode, fattr->mtime); 2378 else if (fattr_supported & NFS_ATTR_FATTR_MTIME) 2379 nfsi->cache_validity |= 2380 save_cache_validity & NFS_INO_INVALID_MTIME; 2381 2382 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 2383 inode_set_ctime_to_ts(inode, fattr->ctime); 2384 else if (fattr_supported & NFS_ATTR_FATTR_CTIME) 2385 nfsi->cache_validity |= 2386 save_cache_validity & NFS_INO_INVALID_CTIME; 2387 2388 if (fattr->valid & NFS_ATTR_FATTR_BTIME) 2389 nfsi->btime = fattr->btime; 2390 else if (fattr_supported & NFS_ATTR_FATTR_BTIME) 2391 nfsi->cache_validity |= 2392 save_cache_validity & NFS_INO_INVALID_BTIME; 2393 2394 /* Check if our cached file size is stale */ 2395 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 2396 new_isize = nfs_size_to_loff_t(fattr->size); 2397 cur_isize = i_size_read(inode); 2398 if (new_isize != cur_isize && !have_delegation) { 2399 /* Do we perhaps have any outstanding writes, or has 2400 * the file grown beyond our last write? */ 2401 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 2402 trace_nfs_size_update(inode, new_isize); 2403 i_size_write(inode, new_isize); 2404 if (!have_writers) 2405 invalid |= NFS_INO_INVALID_DATA; 2406 } 2407 } 2408 if (new_isize == 0 && 2409 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED | 2410 NFS_ATTR_FATTR_BLOCKS_USED))) { 2411 fattr->du.nfs3.used = 0; 2412 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED; 2413 } 2414 } else 2415 nfsi->cache_validity |= 2416 save_cache_validity & NFS_INO_INVALID_SIZE; 2417 2418 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 2419 inode_set_atime_to_ts(inode, fattr->atime); 2420 else if (fattr_supported & NFS_ATTR_FATTR_ATIME) 2421 nfsi->cache_validity |= 2422 save_cache_validity & NFS_INO_INVALID_ATIME; 2423 2424 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 2425 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 2426 umode_t newmode = inode->i_mode & S_IFMT; 2427 newmode |= fattr->mode & S_IALLUGO; 2428 inode->i_mode = newmode; 2429 invalid |= NFS_INO_INVALID_ACCESS 2430 | NFS_INO_INVALID_ACL; 2431 } 2432 } else if (fattr_supported & NFS_ATTR_FATTR_MODE) 2433 nfsi->cache_validity |= 2434 save_cache_validity & NFS_INO_INVALID_MODE; 2435 2436 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 2437 if (!uid_eq(inode->i_uid, fattr->uid)) { 2438 invalid |= NFS_INO_INVALID_ACCESS 2439 | NFS_INO_INVALID_ACL; 2440 inode->i_uid = fattr->uid; 2441 } 2442 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER) 2443 nfsi->cache_validity |= 2444 save_cache_validity & NFS_INO_INVALID_OTHER; 2445 2446 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 2447 if (!gid_eq(inode->i_gid, fattr->gid)) { 2448 invalid |= NFS_INO_INVALID_ACCESS 2449 | NFS_INO_INVALID_ACL; 2450 inode->i_gid = fattr->gid; 2451 } 2452 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP) 2453 nfsi->cache_validity |= 2454 save_cache_validity & NFS_INO_INVALID_OTHER; 2455 2456 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 2457 if (inode->i_nlink != fattr->nlink) 2458 set_nlink(inode, fattr->nlink); 2459 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK) 2460 nfsi->cache_validity |= 2461 save_cache_validity & NFS_INO_INVALID_NLINK; 2462 2463 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 2464 /* 2465 * report the blocks in 512byte units 2466 */ 2467 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 2468 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED) 2469 nfsi->cache_validity |= 2470 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2471 2472 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 2473 inode->i_blocks = fattr->du.nfs2.blocks; 2474 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED) 2475 nfsi->cache_validity |= 2476 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2477 2478 if (fattr->valid & NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA) 2479 nfsi->uncacheable_file_data = 2480 fattr->aux_flags & NFS_AUX_UNCACHEABLE_FILE_DATA; 2481 else if (S_ISREG(inode->i_mode) && 2482 (fattr_supported & NFS_ATTR_FATTR_UNCACHEABLE_FILE_DATA)) 2483 nfsi->cache_validity |= 2484 save_cache_validity & NFS_INO_INVALID_UNCACHEABLE_FILE_DATA; 2485 2486 /* Update attrtimeo value if we're out of the unstable period */ 2487 if (attr_changed) { 2488 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 2489 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 2490 nfsi->attrtimeo_timestamp = now; 2491 /* Set barrier to be more recent than all outstanding updates */ 2492 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 2493 } else { 2494 if (cache_revalidated) { 2495 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 2496 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 2497 nfsi->attrtimeo <<= 1; 2498 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 2499 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 2500 } 2501 nfsi->attrtimeo_timestamp = now; 2502 } 2503 /* Set the barrier to be more recent than this fattr */ 2504 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) 2505 nfsi->attr_gencount = fattr->gencount; 2506 } 2507 2508 /* Don't invalidate the data if we were to blame */ 2509 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 2510 || S_ISLNK(inode->i_mode))) 2511 invalid &= ~NFS_INO_INVALID_DATA; 2512 nfs_set_cache_invalid(inode, invalid); 2513 2514 return 0; 2515 out_err: 2516 /* 2517 * No need to worry about unhashing the dentry, as the 2518 * lookup validation will know that the inode is bad. 2519 * (But we fall through to invalidate the caches.) 2520 */ 2521 nfs_set_inode_stale_locked(inode); 2522 return -ESTALE; 2523 } 2524 2525 struct inode *nfs_alloc_inode(struct super_block *sb) 2526 { 2527 struct nfs_inode *nfsi; 2528 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL); 2529 if (!nfsi) 2530 return NULL; 2531 nfsi->flags = 0UL; 2532 nfsi->cache_validity = 0UL; 2533 nfsi->ooo = NULL; 2534 #if IS_ENABLED(CONFIG_NFS_V4) 2535 nfsi->nfs4_acl = NULL; 2536 #endif /* CONFIG_NFS_V4 */ 2537 #ifdef CONFIG_NFS_V4_2 2538 nfsi->xattr_cache = NULL; 2539 #endif 2540 nfs_netfs_inode_init(nfsi); 2541 2542 return &nfsi->vfs_inode; 2543 } 2544 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 2545 2546 void nfs_free_inode(struct inode *inode) 2547 { 2548 kfree(NFS_I(inode)->ooo); 2549 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 2550 } 2551 EXPORT_SYMBOL_GPL(nfs_free_inode); 2552 2553 static inline void nfs4_init_once(struct nfs_inode *nfsi) 2554 { 2555 #if IS_ENABLED(CONFIG_NFS_V4) 2556 INIT_LIST_HEAD(&nfsi->open_states); 2557 nfsi->delegation = NULL; 2558 init_rwsem(&nfsi->rwsem); 2559 nfsi->layout = NULL; 2560 #endif 2561 } 2562 2563 static void init_once(void *foo) 2564 { 2565 struct nfs_inode *nfsi = foo; 2566 2567 inode_init_once(&nfsi->vfs_inode); 2568 INIT_LIST_HEAD(&nfsi->open_files); 2569 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2570 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2571 nfs4_init_once(nfsi); 2572 } 2573 2574 static int __init nfs_init_inodecache(void) 2575 { 2576 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2577 sizeof(struct nfs_inode), 2578 0, (SLAB_RECLAIM_ACCOUNT| 2579 SLAB_ACCOUNT), 2580 init_once); 2581 if (nfs_inode_cachep == NULL) 2582 return -ENOMEM; 2583 2584 return 0; 2585 } 2586 2587 static void nfs_destroy_inodecache(void) 2588 { 2589 /* 2590 * Make sure all delayed rcu free inodes are flushed before we 2591 * destroy cache. 2592 */ 2593 rcu_barrier(); 2594 kmem_cache_destroy(nfs_inode_cachep); 2595 } 2596 2597 struct workqueue_struct *nfslocaliod_workqueue; 2598 struct workqueue_struct *nfsiod_workqueue; 2599 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2600 2601 /* 2602 * Destroy the nfsiod workqueues 2603 */ 2604 static void nfsiod_stop(void) 2605 { 2606 struct workqueue_struct *wq; 2607 2608 wq = nfsiod_workqueue; 2609 if (wq != NULL) { 2610 nfsiod_workqueue = NULL; 2611 destroy_workqueue(wq); 2612 } 2613 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2614 wq = nfslocaliod_workqueue; 2615 if (wq != NULL) { 2616 nfslocaliod_workqueue = NULL; 2617 destroy_workqueue(wq); 2618 } 2619 #endif /* CONFIG_NFS_LOCALIO */ 2620 } 2621 2622 /* 2623 * Start the nfsiod workqueues 2624 */ 2625 static int nfsiod_start(void) 2626 { 2627 dprintk("RPC: creating workqueue nfsiod\n"); 2628 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); 2629 if (nfsiod_workqueue == NULL) 2630 return -ENOMEM; 2631 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2632 /* 2633 * localio writes need to use a normal (non-memreclaim) workqueue. 2634 * When we start getting low on space, XFS goes and calls flush_work() on 2635 * a non-memreclaim work queue, which causes a priority inversion problem. 2636 */ 2637 dprintk("RPC: creating workqueue nfslocaliod\n"); 2638 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0); 2639 if (unlikely(nfslocaliod_workqueue == NULL)) { 2640 nfsiod_stop(); 2641 return -ENOMEM; 2642 } 2643 #endif /* CONFIG_NFS_LOCALIO */ 2644 return 0; 2645 } 2646 2647 unsigned int nfs_net_id; 2648 EXPORT_SYMBOL_GPL(nfs_net_id); 2649 2650 #ifdef CONFIG_KEYS 2651 static int nfs_init_keyring(struct net *net) 2652 { 2653 struct nfs_net *nn = net_generic(net, nfs_net_id); 2654 struct cred *cred; 2655 struct key *keyring; 2656 2657 cred = prepare_kernel_cred(&init_task); 2658 if (!cred) 2659 return -ENOMEM; 2660 keyring = keyring_alloc(".nfs", net->user_ns->owner, 2661 net->user_ns->group, cred, 2662 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 2663 (KEY_USR_ALL & ~KEY_USR_SETATTR), 2664 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); 2665 put_cred(cred); 2666 if (IS_ERR(keyring)) 2667 return PTR_ERR(keyring); 2668 nn->nfs_keyring = keyring; 2669 return 0; 2670 } 2671 2672 static void nfs_exit_keyring(struct nfs_net *nn) 2673 { 2674 key_put(nn->nfs_keyring); 2675 } 2676 2677 static int nfs_keyring_vet_description(const char *desc) 2678 { 2679 return strcmp(desc, ".nfs") ? -EINVAL : 0; 2680 } 2681 2682 static int nfs_keyring_format_serial(char *buf, size_t len) 2683 { 2684 struct key *keyring = nfs_net_keyring(current->nsproxy->net_ns); 2685 2686 return snprintf(buf, len, "%d", key_serial(keyring)); 2687 } 2688 2689 /* 2690 * A key planted by add_key() answers request_key() before the handler 2691 * runs. Accept only the serial number the handler would produce. 2692 */ 2693 static int nfs_keyring_preparse(struct key_preparsed_payload *prep) 2694 { 2695 char serial[12]; 2696 int len; 2697 2698 len = nfs_keyring_format_serial(serial, sizeof(serial)); 2699 if (prep->datalen != len || !prep->data || 2700 memcmp(prep->data, serial, len)) 2701 return -EINVAL; 2702 return user_preparse(prep); 2703 } 2704 2705 static int nfs_keyring_request_key(struct key *authkey, void *aux) 2706 { 2707 struct request_key_auth *rka = get_request_key_auth(authkey); 2708 char serial[12]; 2709 int len, ret; 2710 2711 len = nfs_keyring_format_serial(serial, sizeof(serial)); 2712 ret = key_instantiate_and_link(rka->target_key, serial, len, 2713 rka->dest_keyring, authkey); 2714 if (ret < 0) 2715 complete_request_key(authkey, ret); 2716 return ret; 2717 } 2718 2719 /* 2720 * A session keyring survives setns(). Without the net domain tag, a 2721 * key instantiated in one namespace answers a request from another. 2722 */ 2723 static struct key_type key_type_nfs_keyring = { 2724 .name = "nfs_keyring", 2725 .flags = KEY_TYPE_NET_DOMAIN, 2726 .vet_description = nfs_keyring_vet_description, 2727 .preparse = nfs_keyring_preparse, 2728 .free_preparse = user_free_preparse, 2729 .instantiate = generic_key_instantiate, 2730 .revoke = user_revoke, 2731 .destroy = user_destroy, 2732 .describe = user_describe, 2733 .read = user_read, 2734 .request_key = nfs_keyring_request_key, 2735 }; 2736 2737 static int __init nfs_register_key_type(void) 2738 { 2739 return register_key_type(&key_type_nfs_keyring); 2740 } 2741 2742 static void nfs_unregister_key_type(void) 2743 { 2744 unregister_key_type(&key_type_nfs_keyring); 2745 } 2746 #else 2747 static inline int nfs_init_keyring(struct net *net) 2748 { 2749 return 0; 2750 } 2751 2752 static inline void nfs_exit_keyring(struct nfs_net *nn) 2753 { 2754 } 2755 2756 static inline int nfs_register_key_type(void) 2757 { 2758 return 0; 2759 } 2760 2761 static inline void nfs_unregister_key_type(void) 2762 { 2763 } 2764 #endif /* CONFIG_KEYS */ 2765 2766 static int nfs_net_init(struct net *net) 2767 { 2768 struct nfs_net *nn = net_generic(net, nfs_net_id); 2769 int err; 2770 2771 err = nfs_init_keyring(net); 2772 if (err) 2773 return err; 2774 2775 nfs_clients_init(net); 2776 2777 if (!rpc_proc_register(net, &nn->rpcstats)) { 2778 err = -ENOMEM; 2779 goto err_proc_rpc; 2780 } 2781 2782 err = nfs_fs_proc_net_init(net); 2783 if (err) 2784 goto err_proc_nfs; 2785 2786 return 0; 2787 2788 err_proc_nfs: 2789 rpc_proc_unregister(net, "nfs"); 2790 err_proc_rpc: 2791 nfs_clients_exit(net); 2792 nfs_exit_keyring(nn); 2793 return err; 2794 } 2795 2796 static void nfs_net_exit(struct net *net) 2797 { 2798 struct nfs_net *nn = net_generic(net, nfs_net_id); 2799 2800 rpc_proc_unregister(net, "nfs"); 2801 nfs_fs_proc_net_exit(net); 2802 nfs_clients_exit(net); 2803 nfs_exit_keyring(nn); 2804 } 2805 2806 static struct pernet_operations nfs_net_ops = { 2807 .init = nfs_net_init, 2808 .exit = nfs_net_exit, 2809 .id = &nfs_net_id, 2810 .size = sizeof(struct nfs_net), 2811 }; 2812 2813 /* 2814 * Initialize NFS 2815 */ 2816 static int __init init_nfs_fs(void) 2817 { 2818 int err; 2819 2820 err = nfs_sysfs_init(); 2821 if (err < 0) 2822 return err; 2823 2824 err = register_pernet_subsys(&nfs_net_ops); 2825 if (err < 0) 2826 goto err_sysfs; 2827 2828 err = nfs_register_key_type(); 2829 if (err) 2830 goto err_pernet; 2831 2832 err = nfsiod_start(); 2833 if (err) 2834 goto err_keytype; 2835 2836 err = nfs_fs_proc_init(); 2837 if (err) 2838 goto err_nfsiod; 2839 2840 err = nfs_init_nfspagecache(); 2841 if (err) 2842 goto err_proc; 2843 2844 err = nfs_init_inodecache(); 2845 if (err) 2846 goto err_nfspagecache; 2847 2848 err = nfs_init_readpagecache(); 2849 if (err) 2850 goto err_inodecache; 2851 2852 err = nfs_init_writepagecache(); 2853 if (err) 2854 goto err_readpagecache; 2855 2856 err = nfs_init_directcache(); 2857 if (err) 2858 goto err_writepagecache; 2859 2860 err = register_nfs_fs(); 2861 if (err) 2862 goto err_directcache; 2863 2864 return 0; 2865 err_directcache: 2866 nfs_destroy_directcache(); 2867 err_writepagecache: 2868 nfs_destroy_writepagecache(); 2869 err_readpagecache: 2870 nfs_destroy_readpagecache(); 2871 err_inodecache: 2872 nfs_destroy_inodecache(); 2873 err_nfspagecache: 2874 nfs_destroy_nfspagecache(); 2875 err_proc: 2876 nfs_fs_proc_exit(); 2877 err_nfsiod: 2878 nfsiod_stop(); 2879 err_keytype: 2880 nfs_unregister_key_type(); 2881 err_pernet: 2882 unregister_pernet_subsys(&nfs_net_ops); 2883 err_sysfs: 2884 nfs_sysfs_exit(); 2885 return err; 2886 } 2887 2888 static void __exit exit_nfs_fs(void) 2889 { 2890 nfs_destroy_directcache(); 2891 nfs_destroy_writepagecache(); 2892 nfs_destroy_readpagecache(); 2893 nfs_destroy_inodecache(); 2894 nfs_destroy_nfspagecache(); 2895 nfs_unregister_key_type(); 2896 unregister_pernet_subsys(&nfs_net_ops); 2897 unregister_nfs_fs(); 2898 nfs_fs_proc_exit(); 2899 nfsiod_stop(); 2900 nfs_sysfs_exit(); 2901 } 2902 2903 /* Not quite true; I just maintain it */ 2904 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2905 MODULE_DESCRIPTION("NFS client support"); 2906 MODULE_LICENSE("GPL"); 2907 module_param_cb(enable_ino64, ¶m_ops_enable_ino64, &enable_ino64, 0644); 2908 2909 module_init(init_nfs_fs) 2910 module_exit(exit_nfs_fs) 2911