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 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "pnfs.h" 52 #include "nfs.h" 53 #include "netns.h" 54 #include "sysfs.h" 55 56 #include "nfstrace.h" 57 58 #define NFSDBG_FACILITY NFSDBG_VFS 59 60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 61 62 /* Default is to see 64-bit inode numbers */ 63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 64 65 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 66 67 static struct kmem_cache * nfs_inode_cachep; 68 69 static inline unsigned long 70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 71 { 72 return nfs_fileid_to_ino_t(fattr->fileid); 73 } 74 75 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 76 { 77 if (unlikely(nfs_current_task_exiting())) 78 return -EINTR; 79 schedule(); 80 if (signal_pending_state(mode, current)) 81 return -ERESTARTSYS; 82 return 0; 83 } 84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 85 86 /** 87 * nfs_compat_user_ino64 - returns the user-visible inode number 88 * @fileid: 64-bit fileid 89 * 90 * This function returns a 32-bit inode number if the boot parameter 91 * nfs.enable_ino64 is zero. 92 */ 93 u64 nfs_compat_user_ino64(u64 fileid) 94 { 95 #ifdef CONFIG_COMPAT 96 compat_ulong_t ino; 97 #else 98 unsigned long ino; 99 #endif 100 101 if (enable_ino64) 102 return fileid; 103 ino = fileid; 104 if (sizeof(ino) < sizeof(fileid)) 105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 106 return ino; 107 } 108 109 int nfs_drop_inode(struct inode *inode) 110 { 111 return NFS_STALE(inode) || generic_drop_inode(inode); 112 } 113 EXPORT_SYMBOL_GPL(nfs_drop_inode); 114 115 void nfs_clear_inode(struct inode *inode) 116 { 117 /* 118 * The following should never happen... 119 */ 120 WARN_ON_ONCE(nfs_have_writebacks(inode)); 121 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 122 nfs_zap_acl_cache(inode); 123 nfs_access_zap_cache(inode); 124 nfs_fscache_clear_inode(inode); 125 } 126 EXPORT_SYMBOL_GPL(nfs_clear_inode); 127 128 void nfs_evict_inode(struct inode *inode) 129 { 130 truncate_inode_pages_final(&inode->i_data); 131 clear_inode(inode); 132 nfs_clear_inode(inode); 133 } 134 135 int nfs_sync_inode(struct inode *inode) 136 { 137 inode_dio_wait(inode); 138 return nfs_wb_all(inode); 139 } 140 EXPORT_SYMBOL_GPL(nfs_sync_inode); 141 142 /** 143 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 144 * @mapping: pointer to struct address_space 145 */ 146 int nfs_sync_mapping(struct address_space *mapping) 147 { 148 int ret = 0; 149 150 if (mapping->nrpages != 0) { 151 unmap_mapping_range(mapping, 0, 0, 0); 152 ret = nfs_wb_all(mapping->host); 153 } 154 return ret; 155 } 156 157 static int nfs_attribute_timeout(struct inode *inode) 158 { 159 struct nfs_inode *nfsi = NFS_I(inode); 160 161 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 162 } 163 164 static bool nfs_check_cache_flags_invalid(struct inode *inode, 165 unsigned long flags) 166 { 167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 168 169 return (cache_validity & flags) != 0; 170 } 171 172 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) 173 { 174 if (nfs_check_cache_flags_invalid(inode, flags)) 175 return true; 176 return nfs_attribute_cache_expired(inode); 177 } 178 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid); 179 180 #ifdef CONFIG_NFS_V4_2 181 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) 182 { 183 return nfsi->xattr_cache != NULL; 184 } 185 #else 186 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) 187 { 188 return false; 189 } 190 #endif 191 192 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 193 { 194 struct nfs_inode *nfsi = NFS_I(inode); 195 196 if (nfs_have_delegated_attributes(inode)) { 197 if (!(flags & NFS_INO_REVAL_FORCED)) 198 flags &= ~(NFS_INO_INVALID_MODE | 199 NFS_INO_INVALID_OTHER | 200 NFS_INO_INVALID_BTIME | 201 NFS_INO_INVALID_XATTR); 202 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); 203 } 204 205 if (!nfs_has_xattr_cache(nfsi)) 206 flags &= ~NFS_INO_INVALID_XATTR; 207 if (flags & NFS_INO_INVALID_DATA) 208 nfs_fscache_invalidate(inode, 0); 209 flags &= ~NFS_INO_REVAL_FORCED; 210 211 flags |= nfsi->cache_validity; 212 if (inode->i_mapping->nrpages == 0) 213 flags &= ~NFS_INO_INVALID_DATA; 214 215 /* pairs with nfs_clear_invalid_mapping()'s smp_load_acquire() */ 216 smp_store_release(&nfsi->cache_validity, flags); 217 218 if (inode->i_mapping->nrpages == 0 || 219 nfsi->cache_validity & NFS_INO_INVALID_DATA) { 220 nfs_ooo_clear(nfsi); 221 } 222 trace_nfs_set_cache_invalid(inode, 0); 223 } 224 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid); 225 226 /* 227 * Invalidate the local caches 228 */ 229 static void nfs_zap_caches_locked(struct inode *inode) 230 { 231 struct nfs_inode *nfsi = NFS_I(inode); 232 int mode = inode->i_mode; 233 234 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 235 236 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 237 nfsi->attrtimeo_timestamp = jiffies; 238 239 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | 241 NFS_INO_INVALID_DATA | 242 NFS_INO_INVALID_ACCESS | 243 NFS_INO_INVALID_ACL | 244 NFS_INO_INVALID_XATTR); 245 else 246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | 247 NFS_INO_INVALID_ACCESS | 248 NFS_INO_INVALID_ACL | 249 NFS_INO_INVALID_XATTR); 250 nfs_zap_label_cache_locked(nfsi); 251 } 252 253 void nfs_zap_caches(struct inode *inode) 254 { 255 spin_lock(&inode->i_lock); 256 nfs_zap_caches_locked(inode); 257 spin_unlock(&inode->i_lock); 258 } 259 260 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 261 { 262 if (mapping->nrpages != 0) { 263 spin_lock(&inode->i_lock); 264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 265 spin_unlock(&inode->i_lock); 266 } 267 } 268 269 void nfs_zap_acl_cache(struct inode *inode) 270 { 271 void (*clear_acl_cache)(struct inode *); 272 273 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 274 if (clear_acl_cache != NULL) 275 clear_acl_cache(inode); 276 spin_lock(&inode->i_lock); 277 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 278 spin_unlock(&inode->i_lock); 279 } 280 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 281 282 void nfs_invalidate_atime(struct inode *inode) 283 { 284 if (nfs_have_delegated_atime(inode)) 285 return; 286 spin_lock(&inode->i_lock); 287 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 288 spin_unlock(&inode->i_lock); 289 } 290 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 291 292 /* 293 * Invalidate, but do not unhash, the inode. 294 * NB: must be called with inode->i_lock held! 295 */ 296 static void nfs_set_inode_stale_locked(struct inode *inode) 297 { 298 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 299 nfs_zap_caches_locked(inode); 300 trace_nfs_set_inode_stale(inode); 301 } 302 303 void nfs_set_inode_stale(struct inode *inode) 304 { 305 spin_lock(&inode->i_lock); 306 nfs_set_inode_stale_locked(inode); 307 spin_unlock(&inode->i_lock); 308 } 309 310 struct nfs_find_desc { 311 struct nfs_fh *fh; 312 struct nfs_fattr *fattr; 313 }; 314 315 /* 316 * In NFSv3 we can have 64bit inode numbers. In order to support 317 * this, and re-exported directories (also seen in NFSv2) 318 * we are forced to allow 2 different inodes to have the same 319 * i_ino. 320 */ 321 static int 322 nfs_find_actor(struct inode *inode, void *opaque) 323 { 324 struct nfs_find_desc *desc = opaque; 325 struct nfs_fh *fh = desc->fh; 326 struct nfs_fattr *fattr = desc->fattr; 327 328 if (NFS_FILEID(inode) != fattr->fileid) 329 return 0; 330 if (inode_wrong_type(inode, fattr->mode)) 331 return 0; 332 if (nfs_compare_fh(NFS_FH(inode), fh)) 333 return 0; 334 if (is_bad_inode(inode) || NFS_STALE(inode)) 335 return 0; 336 return 1; 337 } 338 339 static int 340 nfs_init_locked(struct inode *inode, void *opaque) 341 { 342 struct nfs_find_desc *desc = opaque; 343 struct nfs_fattr *fattr = desc->fattr; 344 345 set_nfs_fileid(inode, fattr->fileid); 346 inode->i_mode = fattr->mode; 347 nfs_copy_fh(NFS_FH(inode), desc->fh); 348 return 0; 349 } 350 351 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 352 static void nfs_clear_label_invalid(struct inode *inode) 353 { 354 spin_lock(&inode->i_lock); 355 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 356 spin_unlock(&inode->i_lock); 357 } 358 359 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) 360 { 361 int error; 362 363 if (fattr->label == NULL) 364 return; 365 366 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 367 error = security_inode_notifysecctx(inode, fattr->label->label, 368 fattr->label->len); 369 if (error) 370 printk(KERN_ERR "%s() %s %d " 371 "security_inode_notifysecctx() %d\n", 372 __func__, 373 (char *)fattr->label->label, 374 fattr->label->len, error); 375 nfs_clear_label_invalid(inode); 376 } 377 } 378 379 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 380 { 381 struct nfs4_label *label; 382 383 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 384 return NULL; 385 386 label = kzalloc(sizeof(struct nfs4_label), flags); 387 if (label == NULL) 388 return ERR_PTR(-ENOMEM); 389 390 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 391 if (label->label == NULL) { 392 kfree(label); 393 return ERR_PTR(-ENOMEM); 394 } 395 label->len = NFS4_MAXLABELLEN; 396 397 return label; 398 } 399 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 400 #else 401 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) 402 { 403 } 404 #endif 405 EXPORT_SYMBOL_GPL(nfs_setsecurity); 406 407 /* Search for inode identified by fh, fileid and i_mode in inode cache. */ 408 struct inode * 409 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) 410 { 411 struct nfs_find_desc desc = { 412 .fh = fh, 413 .fattr = fattr, 414 }; 415 struct inode *inode; 416 unsigned long hash; 417 418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || 419 !(fattr->valid & NFS_ATTR_FATTR_TYPE)) 420 return NULL; 421 422 hash = nfs_fattr_to_ino_t(fattr); 423 inode = ilookup5(sb, hash, nfs_find_actor, &desc); 424 425 dprintk("%s: returning %p\n", __func__, inode); 426 return inode; 427 } 428 429 static void nfs_inode_init_regular(struct nfs_inode *nfsi) 430 { 431 atomic_long_set(&nfsi->nrequests, 0); 432 atomic_long_set(&nfsi->redirtied_pages, 0); 433 INIT_LIST_HEAD(&nfsi->commit_info.list); 434 atomic_long_set(&nfsi->commit_info.ncommit, 0); 435 atomic_set(&nfsi->commit_info.rpcs_out, 0); 436 mutex_init(&nfsi->commit_mutex); 437 } 438 439 static void nfs_inode_init_dir(struct nfs_inode *nfsi) 440 { 441 nfsi->cache_change_attribute = 0; 442 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 443 init_rwsem(&nfsi->rmdir_sem); 444 } 445 446 /* 447 * This is our front-end to iget that looks up inodes by file handle 448 * instead of inode number. 449 */ 450 struct inode * 451 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 452 { 453 struct nfs_find_desc desc = { 454 .fh = fh, 455 .fattr = fattr 456 }; 457 struct inode *inode = ERR_PTR(-ENOENT); 458 u64 fattr_supported = NFS_SB(sb)->fattr_valid; 459 unsigned long hash; 460 461 nfs_attr_check_mountpoint(sb, fattr); 462 463 if (nfs_attr_use_mounted_on_fileid(fattr)) 464 fattr->fileid = fattr->mounted_on_fileid; 465 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 466 goto out_no_inode; 467 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 468 goto out_no_inode; 469 470 hash = nfs_fattr_to_ino_t(fattr); 471 472 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 473 if (inode == NULL) { 474 inode = ERR_PTR(-ENOMEM); 475 goto out_no_inode; 476 } 477 478 if (inode->i_state & I_NEW) { 479 struct nfs_inode *nfsi = NFS_I(inode); 480 unsigned long now = jiffies; 481 482 /* We set i_ino for the few things that still rely on it, 483 * such as stat(2) */ 484 inode->i_ino = hash; 485 486 /* We can't support update_atime(), since the server will reset it */ 487 inode->i_flags |= S_NOATIME|S_NOCMTIME; 488 inode->i_mode = fattr->mode; 489 nfsi->cache_validity = 0; 490 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 491 && (fattr_supported & NFS_ATTR_FATTR_MODE)) 492 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); 493 /* Why so? Because we want revalidate for devices/FIFOs, and 494 * that's precisely what we have in nfs_file_inode_operations. 495 */ 496 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 497 if (S_ISREG(inode->i_mode)) { 498 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 499 inode->i_data.a_ops = &nfs_file_aops; 500 nfs_inode_init_regular(nfsi); 501 mapping_set_large_folios(inode->i_mapping); 502 } else if (S_ISDIR(inode->i_mode)) { 503 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 504 inode->i_fop = &nfs_dir_operations; 505 inode->i_data.a_ops = &nfs_dir_aops; 506 nfs_inode_init_dir(nfsi); 507 /* Deal with crossing mountpoints */ 508 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 509 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 510 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 511 inode->i_op = &nfs_referral_inode_operations; 512 else 513 inode->i_op = &nfs_mountpoint_inode_operations; 514 inode->i_fop = NULL; 515 inode->i_flags |= S_AUTOMOUNT; 516 } 517 } else if (S_ISLNK(inode->i_mode)) { 518 inode->i_op = &nfs_symlink_inode_operations; 519 inode_nohighmem(inode); 520 } else 521 init_special_inode(inode, inode->i_mode, fattr->rdev); 522 523 inode_set_atime(inode, 0, 0); 524 inode_set_mtime(inode, 0, 0); 525 inode_set_ctime(inode, 0, 0); 526 memset(&nfsi->btime, 0, sizeof(nfsi->btime)); 527 inode_set_iversion_raw(inode, 0); 528 inode->i_size = 0; 529 clear_nlink(inode); 530 inode->i_uid = make_kuid(&init_user_ns, -2); 531 inode->i_gid = make_kgid(&init_user_ns, -2); 532 inode->i_blocks = 0; 533 nfsi->write_io = 0; 534 nfsi->read_io = 0; 535 536 nfsi->read_cache_jiffies = fattr->time_start; 537 nfsi->attr_gencount = fattr->gencount; 538 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 539 inode_set_atime_to_ts(inode, fattr->atime); 540 else if (fattr_supported & NFS_ATTR_FATTR_ATIME) 541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 542 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 543 inode_set_mtime_to_ts(inode, fattr->mtime); 544 else if (fattr_supported & NFS_ATTR_FATTR_MTIME) 545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 546 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 547 inode_set_ctime_to_ts(inode, fattr->ctime); 548 else if (fattr_supported & NFS_ATTR_FATTR_CTIME) 549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); 550 if (fattr->valid & NFS_ATTR_FATTR_BTIME) 551 nfsi->btime = fattr->btime; 552 else if (fattr_supported & NFS_ATTR_FATTR_BTIME) 553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BTIME); 554 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 555 inode_set_iversion_raw(inode, fattr->change_attr); 556 else 557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); 558 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 559 inode->i_size = nfs_size_to_loff_t(fattr->size); 560 else 561 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); 562 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 563 set_nlink(inode, fattr->nlink); 564 else if (fattr_supported & NFS_ATTR_FATTR_NLINK) 565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK); 566 else 567 set_nlink(inode, 1); 568 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 569 inode->i_uid = fattr->uid; 570 else if (fattr_supported & NFS_ATTR_FATTR_OWNER) 571 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 572 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 573 inode->i_gid = fattr->gid; 574 else if (fattr_supported & NFS_ATTR_FATTR_GROUP) 575 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 576 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 577 inode->i_blocks = fattr->du.nfs2.blocks; 578 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED && 579 fattr->size != 0) 580 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 581 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 582 /* 583 * report the blocks in 512byte units 584 */ 585 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 586 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED && 587 fattr->size != 0) 588 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 589 590 nfs_setsecurity(inode, fattr); 591 592 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 593 nfsi->attrtimeo_timestamp = now; 594 nfsi->access_cache = RB_ROOT; 595 596 nfs_fscache_init_inode(inode); 597 598 unlock_new_inode(inode); 599 } else { 600 int err = nfs_refresh_inode(inode, fattr); 601 if (err < 0) { 602 iput(inode); 603 inode = ERR_PTR(err); 604 goto out_no_inode; 605 } 606 } 607 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 608 inode->i_sb->s_id, 609 (unsigned long long)NFS_FILEID(inode), 610 nfs_display_fhandle_hash(fh), 611 atomic_read(&inode->i_count)); 612 613 out: 614 return inode; 615 616 out_no_inode: 617 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 618 goto out; 619 } 620 EXPORT_SYMBOL_GPL(nfs_fhget); 621 622 static void 623 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr) 624 { 625 unsigned long cache_validity = NFS_I(inode)->cache_validity; 626 627 if (nfs_have_delegated_mtime(inode)) { 628 if (!(cache_validity & NFS_INO_INVALID_CTIME)) 629 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME | 630 NFS_ATTR_FATTR_CTIME); 631 632 if (!(cache_validity & NFS_INO_INVALID_MTIME)) 633 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME | 634 NFS_ATTR_FATTR_MTIME); 635 636 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 637 fattr->valid &= ~NFS_ATTR_FATTR_ATIME; 638 } else if (nfs_have_delegated_atime(inode)) { 639 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 640 fattr->valid &= ~NFS_ATTR_FATTR_ATIME; 641 } 642 } 643 644 static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr) 645 { 646 unsigned int cache_flags = 0; 647 648 if (attr->ia_valid & ATTR_MTIME_SET) { 649 struct timespec64 ctime = inode_get_ctime(inode); 650 struct timespec64 mtime = inode_get_mtime(inode); 651 struct timespec64 now; 652 int updated = 0; 653 654 now = inode_set_ctime_current(inode); 655 if (!timespec64_equal(&now, &ctime)) 656 updated |= S_CTIME; 657 658 inode_set_mtime_to_ts(inode, attr->ia_mtime); 659 if (!timespec64_equal(&now, &mtime)) 660 updated |= S_MTIME; 661 662 inode_maybe_inc_iversion(inode, updated); 663 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 664 } 665 if (attr->ia_valid & ATTR_ATIME_SET) { 666 inode_set_atime_to_ts(inode, attr->ia_atime); 667 cache_flags |= NFS_INO_INVALID_ATIME; 668 } 669 NFS_I(inode)->cache_validity &= ~cache_flags; 670 } 671 672 static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid) 673 { 674 enum file_time_flags time_flags = 0; 675 unsigned int cache_flags = 0; 676 677 if (ia_valid & ATTR_MTIME) { 678 time_flags |= S_MTIME | S_CTIME; 679 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 680 } 681 if (ia_valid & ATTR_ATIME) { 682 time_flags |= S_ATIME; 683 cache_flags |= NFS_INO_INVALID_ATIME; 684 } 685 inode_update_timestamps(inode, time_flags); 686 NFS_I(inode)->cache_validity &= ~cache_flags; 687 } 688 689 void nfs_update_delegated_atime(struct inode *inode) 690 { 691 spin_lock(&inode->i_lock); 692 if (nfs_have_delegated_atime(inode)) 693 nfs_update_timestamps(inode, ATTR_ATIME); 694 spin_unlock(&inode->i_lock); 695 } 696 697 void nfs_update_delegated_mtime_locked(struct inode *inode) 698 { 699 if (nfs_have_delegated_mtime(inode)) 700 nfs_update_timestamps(inode, ATTR_MTIME); 701 } 702 703 void nfs_update_delegated_mtime(struct inode *inode) 704 { 705 spin_lock(&inode->i_lock); 706 nfs_update_delegated_mtime_locked(inode); 707 spin_unlock(&inode->i_lock); 708 } 709 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime); 710 711 #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) 712 713 int 714 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 715 struct iattr *attr) 716 { 717 struct inode *inode = d_inode(dentry); 718 struct nfs_fattr *fattr; 719 int error = 0; 720 721 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 722 723 /* skip mode change if it's just for clearing setuid/setgid */ 724 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 725 attr->ia_valid &= ~ATTR_MODE; 726 727 if (attr->ia_valid & ATTR_SIZE) { 728 BUG_ON(!S_ISREG(inode->i_mode)); 729 730 error = inode_newsize_ok(inode, attr->ia_size); 731 if (error) 732 return error; 733 734 if (attr->ia_size == i_size_read(inode)) 735 attr->ia_valid &= ~ATTR_SIZE; 736 } 737 738 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) { 739 spin_lock(&inode->i_lock); 740 if (attr->ia_valid & ATTR_MTIME_SET) { 741 nfs_set_timestamps_to_ts(inode, attr); 742 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET| 743 ATTR_ATIME|ATTR_ATIME_SET); 744 } else { 745 nfs_update_timestamps(inode, attr->ia_valid); 746 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME); 747 } 748 spin_unlock(&inode->i_lock); 749 } else if (nfs_have_delegated_atime(inode) && 750 attr->ia_valid & ATTR_ATIME && 751 !(attr->ia_valid & ATTR_MTIME)) { 752 if (attr->ia_valid & ATTR_ATIME_SET) { 753 spin_lock(&inode->i_lock); 754 nfs_set_timestamps_to_ts(inode, attr); 755 spin_unlock(&inode->i_lock); 756 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET); 757 } else { 758 nfs_update_delegated_atime(inode); 759 attr->ia_valid &= ~ATTR_ATIME; 760 } 761 } 762 763 /* Optimization: if the end result is no change, don't RPC */ 764 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0) 765 return 0; 766 767 trace_nfs_setattr_enter(inode); 768 769 /* Write all dirty data */ 770 if (S_ISREG(inode->i_mode)) 771 nfs_sync_inode(inode); 772 773 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 774 if (fattr == NULL) { 775 error = -ENOMEM; 776 goto out; 777 } 778 779 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 780 if (error == 0) 781 error = nfs_refresh_inode(inode, fattr); 782 nfs_free_fattr(fattr); 783 out: 784 trace_nfs_setattr_exit(inode, error); 785 return error; 786 } 787 EXPORT_SYMBOL_GPL(nfs_setattr); 788 789 /** 790 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 791 * @inode: inode of the file used 792 * @offset: file offset to start truncating 793 * 794 * This is a copy of the common vmtruncate, but with the locking 795 * corrected to take into account the fact that NFS requires 796 * inode->i_size to be updated under the inode->i_lock. 797 * Note: must be called with inode->i_lock held! 798 */ 799 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 800 { 801 int err; 802 803 err = inode_newsize_ok(inode, offset); 804 if (err) 805 goto out; 806 807 trace_nfs_size_truncate(inode, offset); 808 i_size_write(inode, offset); 809 /* Optimisation */ 810 if (offset == 0) { 811 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 812 nfs_ooo_clear(NFS_I(inode)); 813 } 814 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 815 816 spin_unlock(&inode->i_lock); 817 truncate_pagecache(inode, offset); 818 nfs_update_delegated_mtime_locked(inode); 819 spin_lock(&inode->i_lock); 820 out: 821 return err; 822 } 823 824 /** 825 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 826 * @inode: pointer to struct inode 827 * @attr: pointer to struct iattr 828 * @fattr: pointer to struct nfs_fattr 829 * 830 * Note: we do this in the *proc.c in order to ensure that 831 * it works for things like exclusive creates too. 832 */ 833 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 834 struct nfs_fattr *fattr) 835 { 836 /* Barrier: bump the attribute generation count. */ 837 nfs_fattr_set_barrier(fattr); 838 839 spin_lock(&inode->i_lock); 840 NFS_I(inode)->attr_gencount = fattr->gencount; 841 if ((attr->ia_valid & ATTR_SIZE) != 0) { 842 if (!nfs_have_delegated_mtime(inode)) 843 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 844 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); 845 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 846 nfs_vmtruncate(inode, attr->ia_size); 847 } 848 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 849 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; 850 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 && 851 inode->i_mode & S_ISUID) 852 inode->i_mode &= ~S_ISUID; 853 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode)) 854 inode->i_mode &= ~S_ISGID; 855 if ((attr->ia_valid & ATTR_MODE) != 0) { 856 int mode = attr->ia_mode & S_IALLUGO; 857 mode |= inode->i_mode & ~S_IALLUGO; 858 inode->i_mode = mode; 859 } 860 if ((attr->ia_valid & ATTR_UID) != 0) 861 inode->i_uid = attr->ia_uid; 862 if ((attr->ia_valid & ATTR_GID) != 0) 863 inode->i_gid = attr->ia_gid; 864 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 865 inode_set_ctime_to_ts(inode, fattr->ctime); 866 else 867 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 868 | NFS_INO_INVALID_CTIME); 869 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 870 | NFS_INO_INVALID_ACL); 871 } 872 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { 873 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME 874 | NFS_INO_INVALID_CTIME); 875 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 876 inode_set_atime_to_ts(inode, fattr->atime); 877 else if (attr->ia_valid & ATTR_ATIME_SET) 878 inode_set_atime_to_ts(inode, attr->ia_atime); 879 else 880 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 881 882 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 883 inode_set_ctime_to_ts(inode, fattr->ctime); 884 else 885 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 886 | NFS_INO_INVALID_CTIME); 887 } 888 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { 889 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME 890 | NFS_INO_INVALID_CTIME); 891 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 892 inode_set_mtime_to_ts(inode, fattr->mtime); 893 else if (attr->ia_valid & ATTR_MTIME_SET) 894 inode_set_mtime_to_ts(inode, attr->ia_mtime); 895 else 896 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 897 898 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 899 inode_set_ctime_to_ts(inode, fattr->ctime); 900 else 901 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 902 | NFS_INO_INVALID_CTIME); 903 } 904 if (fattr->valid) 905 nfs_update_inode(inode, fattr); 906 spin_unlock(&inode->i_lock); 907 } 908 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 909 910 /* 911 * Don't request help from readdirplus if the file is being written to, 912 * or if attribute caching is turned off 913 */ 914 static bool nfs_getattr_readdirplus_enable(const struct inode *inode) 915 { 916 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) && 917 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ; 918 } 919 920 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) 921 { 922 if (!IS_ROOT(dentry)) { 923 struct dentry *parent = dget_parent(dentry); 924 nfs_readdir_record_entry_cache_miss(d_inode(parent)); 925 dput(parent); 926 } 927 } 928 929 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) 930 { 931 if (!IS_ROOT(dentry)) { 932 struct dentry *parent = dget_parent(dentry); 933 nfs_readdir_record_entry_cache_hit(d_inode(parent)); 934 dput(parent); 935 } 936 } 937 938 static u32 nfs_get_valid_attrmask(struct inode *inode) 939 { 940 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid; 941 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 942 u32 reply_mask = STATX_INO | STATX_TYPE; 943 944 if (!(cache_validity & NFS_INO_INVALID_ATIME)) 945 reply_mask |= STATX_ATIME; 946 if (!(cache_validity & NFS_INO_INVALID_CTIME)) 947 reply_mask |= STATX_CTIME; 948 if (!(cache_validity & NFS_INO_INVALID_MTIME)) 949 reply_mask |= STATX_MTIME; 950 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 951 reply_mask |= STATX_SIZE; 952 if (!(cache_validity & NFS_INO_INVALID_NLINK)) 953 reply_mask |= STATX_NLINK; 954 if (!(cache_validity & NFS_INO_INVALID_MODE)) 955 reply_mask |= STATX_MODE; 956 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 957 reply_mask |= STATX_UID | STATX_GID; 958 if (!(cache_validity & NFS_INO_INVALID_BLOCKS)) 959 reply_mask |= STATX_BLOCKS; 960 if (!(cache_validity & NFS_INO_INVALID_BTIME) && 961 (fattr_valid & NFS_ATTR_FATTR_BTIME)) 962 reply_mask |= STATX_BTIME; 963 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 964 reply_mask |= STATX_CHANGE_COOKIE; 965 return reply_mask; 966 } 967 968 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path, 969 struct kstat *stat, u32 request_mask, unsigned int query_flags) 970 { 971 struct inode *inode = d_inode(path->dentry); 972 struct nfs_server *server = NFS_SERVER(inode); 973 u64 fattr_valid = server->fattr_valid; 974 unsigned long cache_validity; 975 int err = 0; 976 bool force_sync = query_flags & AT_STATX_FORCE_SYNC; 977 bool do_update = false; 978 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode); 979 980 trace_nfs_getattr_enter(inode); 981 982 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID | 983 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME | 984 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME | 985 STATX_CHANGE_COOKIE; 986 987 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME)) 988 request_mask &= ~STATX_BTIME; 989 990 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) { 991 if (readdirplus_enabled) 992 nfs_readdirplus_parent_cache_hit(path->dentry); 993 goto out_no_revalidate; 994 } 995 996 /* Flush out writes to the server in order to update c/mtime/version. */ 997 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) && 998 S_ISREG(inode->i_mode)) { 999 if (nfs_have_delegated_mtime(inode)) 1000 filemap_fdatawrite(inode->i_mapping); 1001 else 1002 filemap_write_and_wait(inode->i_mapping); 1003 } 1004 1005 /* 1006 * We may force a getattr if the user cares about atime. 1007 * 1008 * Note that we only have to check the vfsmount flags here: 1009 * - NFS always sets S_NOATIME by so checking it would give a 1010 * bogus result 1011 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is 1012 * no point in checking those. 1013 */ 1014 if ((path->mnt->mnt_flags & MNT_NOATIME) || 1015 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 1016 request_mask &= ~STATX_ATIME; 1017 1018 /* Is the user requesting attributes that might need revalidation? */ 1019 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| 1020 STATX_MTIME|STATX_UID|STATX_GID| 1021 STATX_SIZE|STATX_BLOCKS|STATX_BTIME| 1022 STATX_CHANGE_COOKIE))) 1023 goto out_no_revalidate; 1024 1025 /* Check whether the cached attributes are stale */ 1026 do_update |= force_sync || nfs_attribute_cache_expired(inode); 1027 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 1028 do_update |= cache_validity & NFS_INO_INVALID_CHANGE; 1029 if (request_mask & STATX_ATIME) 1030 do_update |= cache_validity & NFS_INO_INVALID_ATIME; 1031 if (request_mask & STATX_CTIME) 1032 do_update |= cache_validity & NFS_INO_INVALID_CTIME; 1033 if (request_mask & STATX_MTIME) 1034 do_update |= cache_validity & NFS_INO_INVALID_MTIME; 1035 if (request_mask & STATX_SIZE) 1036 do_update |= cache_validity & NFS_INO_INVALID_SIZE; 1037 if (request_mask & STATX_NLINK) 1038 do_update |= cache_validity & NFS_INO_INVALID_NLINK; 1039 if (request_mask & STATX_MODE) 1040 do_update |= cache_validity & NFS_INO_INVALID_MODE; 1041 if (request_mask & (STATX_UID | STATX_GID)) 1042 do_update |= cache_validity & NFS_INO_INVALID_OTHER; 1043 if (request_mask & STATX_BLOCKS) 1044 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS; 1045 if (request_mask & STATX_BTIME) 1046 do_update |= cache_validity & NFS_INO_INVALID_BTIME; 1047 1048 if (do_update) { 1049 if (readdirplus_enabled) 1050 nfs_readdirplus_parent_cache_miss(path->dentry); 1051 err = __nfs_revalidate_inode(server, inode); 1052 if (err) 1053 goto out; 1054 } else if (readdirplus_enabled) 1055 nfs_readdirplus_parent_cache_hit(path->dentry); 1056 out_no_revalidate: 1057 /* Only return attributes that were revalidated. */ 1058 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask; 1059 1060 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 1061 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 1062 stat->change_cookie = inode_peek_iversion_raw(inode); 1063 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC; 1064 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED) 1065 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; 1066 if (S_ISDIR(inode->i_mode)) 1067 stat->blksize = NFS_SERVER(inode)->dtsize; 1068 stat->btime = NFS_I(inode)->btime; 1069 out: 1070 trace_nfs_getattr_exit(inode, err); 1071 return err; 1072 } 1073 EXPORT_SYMBOL_GPL(nfs_getattr); 1074 1075 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 1076 { 1077 refcount_set(&l_ctx->count, 1); 1078 l_ctx->lockowner = current->files; 1079 INIT_LIST_HEAD(&l_ctx->list); 1080 atomic_set(&l_ctx->io_count, 0); 1081 } 1082 1083 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 1084 { 1085 struct nfs_lock_context *pos; 1086 1087 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { 1088 if (pos->lockowner != current->files) 1089 continue; 1090 if (refcount_inc_not_zero(&pos->count)) 1091 return pos; 1092 } 1093 return NULL; 1094 } 1095 1096 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 1097 { 1098 struct nfs_lock_context *res, *new = NULL; 1099 struct inode *inode = d_inode(ctx->dentry); 1100 1101 rcu_read_lock(); 1102 res = __nfs_find_lock_context(ctx); 1103 rcu_read_unlock(); 1104 if (res == NULL) { 1105 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT); 1106 if (new == NULL) 1107 return ERR_PTR(-ENOMEM); 1108 nfs_init_lock_context(new); 1109 spin_lock(&inode->i_lock); 1110 res = __nfs_find_lock_context(ctx); 1111 if (res == NULL) { 1112 new->open_context = get_nfs_open_context(ctx); 1113 if (new->open_context) { 1114 list_add_tail_rcu(&new->list, 1115 &ctx->lock_context.list); 1116 res = new; 1117 new = NULL; 1118 } else 1119 res = ERR_PTR(-EBADF); 1120 } 1121 spin_unlock(&inode->i_lock); 1122 kfree(new); 1123 } 1124 return res; 1125 } 1126 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 1127 1128 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 1129 { 1130 struct nfs_open_context *ctx = l_ctx->open_context; 1131 struct inode *inode = d_inode(ctx->dentry); 1132 1133 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) 1134 return; 1135 list_del_rcu(&l_ctx->list); 1136 spin_unlock(&inode->i_lock); 1137 put_nfs_open_context(ctx); 1138 kfree_rcu(l_ctx, rcu_head); 1139 } 1140 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 1141 1142 /** 1143 * nfs_close_context - Common close_context() routine NFSv2/v3 1144 * @ctx: pointer to context 1145 * @is_sync: is this a synchronous close 1146 * 1147 * Ensure that the attributes are up to date if we're mounted 1148 * with close-to-open semantics and we have cached data that will 1149 * need to be revalidated on open. 1150 */ 1151 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 1152 { 1153 struct nfs_inode *nfsi; 1154 struct inode *inode; 1155 1156 if (!(ctx->mode & FMODE_WRITE)) 1157 return; 1158 if (!is_sync) 1159 return; 1160 inode = d_inode(ctx->dentry); 1161 if (nfs_have_read_or_write_delegation(inode)) 1162 return; 1163 nfsi = NFS_I(inode); 1164 if (inode->i_mapping->nrpages == 0) 1165 return; 1166 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1167 return; 1168 if (!list_empty(&nfsi->open_files)) 1169 return; 1170 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO) 1171 return; 1172 nfs_revalidate_inode(inode, 1173 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); 1174 } 1175 EXPORT_SYMBOL_GPL(nfs_close_context); 1176 1177 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 1178 fmode_t f_mode, 1179 struct file *filp) 1180 { 1181 struct nfs_open_context *ctx; 1182 1183 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT); 1184 if (!ctx) 1185 return ERR_PTR(-ENOMEM); 1186 nfs_sb_active(dentry->d_sb); 1187 ctx->dentry = dget(dentry); 1188 if (filp) 1189 ctx->cred = get_cred(filp->f_cred); 1190 else 1191 ctx->cred = get_current_cred(); 1192 rcu_assign_pointer(ctx->ll_cred, NULL); 1193 ctx->state = NULL; 1194 ctx->mode = f_mode; 1195 ctx->flags = 0; 1196 ctx->error = 0; 1197 ctx->flock_owner = (fl_owner_t)filp; 1198 nfs_init_lock_context(&ctx->lock_context); 1199 ctx->lock_context.open_context = ctx; 1200 INIT_LIST_HEAD(&ctx->list); 1201 ctx->mdsthreshold = NULL; 1202 nfs_localio_file_init(&ctx->nfl); 1203 1204 return ctx; 1205 } 1206 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 1207 1208 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 1209 { 1210 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) 1211 return ctx; 1212 return NULL; 1213 } 1214 EXPORT_SYMBOL_GPL(get_nfs_open_context); 1215 1216 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 1217 { 1218 struct inode *inode = d_inode(ctx->dentry); 1219 struct super_block *sb = ctx->dentry->d_sb; 1220 1221 if (!refcount_dec_and_test(&ctx->lock_context.count)) 1222 return; 1223 if (!list_empty(&ctx->list)) { 1224 spin_lock(&inode->i_lock); 1225 list_del_rcu(&ctx->list); 1226 spin_unlock(&inode->i_lock); 1227 } 1228 if (inode != NULL) 1229 NFS_PROTO(inode)->close_context(ctx, is_sync); 1230 put_cred(ctx->cred); 1231 dput(ctx->dentry); 1232 nfs_sb_deactive(sb); 1233 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1)); 1234 kfree(ctx->mdsthreshold); 1235 nfs_close_local_fh(&ctx->nfl); 1236 kfree_rcu(ctx, rcu_head); 1237 } 1238 1239 void put_nfs_open_context(struct nfs_open_context *ctx) 1240 { 1241 __put_nfs_open_context(ctx, 0); 1242 } 1243 EXPORT_SYMBOL_GPL(put_nfs_open_context); 1244 1245 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 1246 { 1247 __put_nfs_open_context(ctx, 1); 1248 } 1249 1250 /* 1251 * Ensure that mmap has a recent RPC credential for use when writing out 1252 * shared pages 1253 */ 1254 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 1255 { 1256 struct inode *inode = d_inode(ctx->dentry); 1257 struct nfs_inode *nfsi = NFS_I(inode); 1258 1259 spin_lock(&inode->i_lock); 1260 if (list_empty(&nfsi->open_files) && 1261 nfs_ooo_test(nfsi)) 1262 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA | 1263 NFS_INO_REVAL_FORCED); 1264 list_add_tail_rcu(&ctx->list, &nfsi->open_files); 1265 spin_unlock(&inode->i_lock); 1266 } 1267 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 1268 1269 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 1270 { 1271 filp->private_data = get_nfs_open_context(ctx); 1272 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); 1273 if (list_empty(&ctx->list)) 1274 nfs_inode_attach_open_context(ctx); 1275 } 1276 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 1277 1278 /* 1279 * Given an inode, search for an open context with the desired characteristics 1280 */ 1281 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) 1282 { 1283 struct nfs_inode *nfsi = NFS_I(inode); 1284 struct nfs_open_context *pos, *ctx = NULL; 1285 1286 rcu_read_lock(); 1287 list_for_each_entry_rcu(pos, &nfsi->open_files, list) { 1288 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0) 1289 continue; 1290 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 1291 continue; 1292 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags)) 1293 continue; 1294 ctx = get_nfs_open_context(pos); 1295 if (ctx) 1296 break; 1297 } 1298 rcu_read_unlock(); 1299 return ctx; 1300 } 1301 1302 void nfs_file_clear_open_context(struct file *filp) 1303 { 1304 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1305 1306 if (ctx) { 1307 struct inode *inode = d_inode(ctx->dentry); 1308 1309 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); 1310 /* 1311 * We fatal error on write before. Try to writeback 1312 * every page again. 1313 */ 1314 if (ctx->error < 0) 1315 invalidate_inode_pages2(inode->i_mapping); 1316 filp->private_data = NULL; 1317 put_nfs_open_context_sync(ctx); 1318 } 1319 } 1320 1321 /* 1322 * These allocate and release file read/write context information. 1323 */ 1324 int nfs_open(struct inode *inode, struct file *filp) 1325 { 1326 struct nfs_open_context *ctx; 1327 1328 ctx = alloc_nfs_open_context(file_dentry(filp), 1329 flags_to_mode(filp->f_flags), filp); 1330 if (IS_ERR(ctx)) 1331 return PTR_ERR(ctx); 1332 nfs_file_set_open_context(filp, ctx); 1333 put_nfs_open_context(ctx); 1334 nfs_fscache_open_file(inode, filp); 1335 return 0; 1336 } 1337 1338 /* 1339 * This function is called whenever some part of NFS notices that 1340 * the cached attributes have to be refreshed. 1341 */ 1342 int 1343 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1344 { 1345 int status = -ESTALE; 1346 struct nfs_fattr *fattr = NULL; 1347 struct nfs_inode *nfsi = NFS_I(inode); 1348 1349 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1350 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1351 1352 trace_nfs_revalidate_inode_enter(inode); 1353 1354 if (is_bad_inode(inode)) 1355 goto out; 1356 if (NFS_STALE(inode)) 1357 goto out; 1358 1359 /* pNFS: Attributes aren't updated until we layoutcommit */ 1360 if (S_ISREG(inode->i_mode)) { 1361 status = pnfs_sync_inode(inode, false); 1362 if (status) 1363 goto out; 1364 } 1365 1366 status = -ENOMEM; 1367 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 1368 if (fattr == NULL) 1369 goto out; 1370 1371 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1372 1373 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode); 1374 if (status != 0) { 1375 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1376 inode->i_sb->s_id, 1377 (unsigned long long)NFS_FILEID(inode), status); 1378 switch (status) { 1379 case -ETIMEDOUT: 1380 /* A soft timeout occurred. Use cached information? */ 1381 if (server->flags & NFS_MOUNT_SOFTREVAL) 1382 status = 0; 1383 break; 1384 case -ESTALE: 1385 if (!S_ISDIR(inode->i_mode)) 1386 nfs_set_inode_stale(inode); 1387 else 1388 nfs_zap_caches(inode); 1389 } 1390 goto out; 1391 } 1392 1393 status = nfs_refresh_inode(inode, fattr); 1394 if (status) { 1395 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1396 inode->i_sb->s_id, 1397 (unsigned long long)NFS_FILEID(inode), status); 1398 goto out; 1399 } 1400 1401 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1402 nfs_zap_acl_cache(inode); 1403 1404 nfs_setsecurity(inode, fattr); 1405 1406 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1407 inode->i_sb->s_id, 1408 (unsigned long long)NFS_FILEID(inode)); 1409 1410 out: 1411 nfs_free_fattr(fattr); 1412 trace_nfs_revalidate_inode_exit(inode, status); 1413 return status; 1414 } 1415 1416 int nfs_attribute_cache_expired(struct inode *inode) 1417 { 1418 if (nfs_have_delegated_attributes(inode)) 1419 return 0; 1420 return nfs_attribute_timeout(inode); 1421 } 1422 1423 /** 1424 * nfs_revalidate_inode - Revalidate the inode attributes 1425 * @inode: pointer to inode struct 1426 * @flags: cache flags to check 1427 * 1428 * Updates inode attribute information by retrieving the data from the server. 1429 */ 1430 int nfs_revalidate_inode(struct inode *inode, unsigned long flags) 1431 { 1432 if (!nfs_check_cache_invalid(inode, flags)) 1433 return NFS_STALE(inode) ? -ESTALE : 0; 1434 return __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1435 } 1436 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1437 1438 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1439 { 1440 int ret; 1441 1442 nfs_fscache_invalidate(inode, 0); 1443 if (mapping->nrpages != 0) { 1444 if (S_ISREG(inode->i_mode)) { 1445 ret = nfs_sync_mapping(mapping); 1446 if (ret < 0) 1447 return ret; 1448 } 1449 ret = invalidate_inode_pages2(mapping); 1450 if (ret < 0) 1451 return ret; 1452 } 1453 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1454 1455 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1456 inode->i_sb->s_id, 1457 (unsigned long long)NFS_FILEID(inode)); 1458 return 0; 1459 } 1460 1461 /** 1462 * nfs_clear_invalid_mapping - Conditionally clear a mapping 1463 * @mapping: pointer to mapping 1464 * 1465 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping. 1466 */ 1467 int nfs_clear_invalid_mapping(struct address_space *mapping) 1468 { 1469 struct inode *inode = mapping->host; 1470 struct nfs_inode *nfsi = NFS_I(inode); 1471 unsigned long *bitlock = &nfsi->flags; 1472 int ret = 0; 1473 1474 /* 1475 * We must clear NFS_INO_INVALID_DATA first to ensure that 1476 * invalidations that come in while we're shooting down the mappings 1477 * are respected. But, that leaves a race window where one revalidator 1478 * can clear the flag, and then another checks it before the mapping 1479 * gets invalidated. Fix that by serializing access to this part of 1480 * the function. 1481 * 1482 * At the same time, we need to allow other tasks to see whether we 1483 * might be in the middle of invalidating the pages, so we only set 1484 * the bit lock here if it looks like we're going to be doing that. 1485 */ 1486 for (;;) { 1487 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1488 nfs_wait_bit_killable, 1489 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 1490 if (ret) 1491 goto out; 1492 smp_rmb(); /* pairs with smp_wmb() below */ 1493 if (test_bit(NFS_INO_INVALIDATING, bitlock)) 1494 continue; 1495 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */ 1496 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA)) 1497 goto out; 1498 /* Slow-path that double-checks with spinlock held */ 1499 spin_lock(&inode->i_lock); 1500 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1501 spin_unlock(&inode->i_lock); 1502 continue; 1503 } 1504 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1505 break; 1506 spin_unlock(&inode->i_lock); 1507 goto out; 1508 } 1509 1510 set_bit(NFS_INO_INVALIDATING, bitlock); 1511 smp_wmb(); 1512 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1513 nfs_ooo_clear(nfsi); 1514 spin_unlock(&inode->i_lock); 1515 trace_nfs_invalidate_mapping_enter(inode); 1516 ret = nfs_invalidate_mapping(inode, mapping); 1517 trace_nfs_invalidate_mapping_exit(inode, ret); 1518 1519 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1520 smp_mb__after_atomic(); 1521 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1522 out: 1523 return ret; 1524 } 1525 1526 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1527 { 1528 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) || 1529 NFS_STALE(inode); 1530 } 1531 1532 int nfs_revalidate_mapping_rcu(struct inode *inode) 1533 { 1534 struct nfs_inode *nfsi = NFS_I(inode); 1535 unsigned long *bitlock = &nfsi->flags; 1536 int ret = 0; 1537 1538 if (IS_SWAPFILE(inode)) 1539 goto out; 1540 if (nfs_mapping_need_revalidate_inode(inode)) { 1541 ret = -ECHILD; 1542 goto out; 1543 } 1544 spin_lock(&inode->i_lock); 1545 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1546 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1547 ret = -ECHILD; 1548 spin_unlock(&inode->i_lock); 1549 out: 1550 return ret; 1551 } 1552 1553 /** 1554 * nfs_revalidate_mapping - Revalidate the pagecache 1555 * @inode: pointer to host inode 1556 * @mapping: pointer to mapping 1557 */ 1558 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1559 { 1560 /* swapfiles are not supposed to be shared. */ 1561 if (IS_SWAPFILE(inode)) 1562 return 0; 1563 1564 if (nfs_mapping_need_revalidate_inode(inode)) { 1565 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1566 if (ret < 0) 1567 return ret; 1568 } 1569 1570 return nfs_clear_invalid_mapping(mapping); 1571 } 1572 1573 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1574 { 1575 struct inode *inode = &nfsi->vfs_inode; 1576 1577 if (!S_ISREG(inode->i_mode)) 1578 return false; 1579 if (list_empty(&nfsi->open_files)) 1580 return false; 1581 return inode_is_open_for_write(inode); 1582 } 1583 1584 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1585 { 1586 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1587 } 1588 1589 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1590 { 1591 struct timespec64 ts; 1592 1593 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1594 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1595 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { 1596 inode_set_iversion_raw(inode, fattr->change_attr); 1597 if (S_ISDIR(inode->i_mode)) 1598 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1599 else if (nfs_server_capable(inode, NFS_CAP_XATTR)) 1600 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); 1601 } 1602 /* If we have atomic WCC data, we may update some attributes */ 1603 ts = inode_get_ctime(inode); 1604 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1605 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1606 && timespec64_equal(&ts, &fattr->pre_ctime)) { 1607 inode_set_ctime_to_ts(inode, fattr->ctime); 1608 } 1609 1610 ts = inode_get_mtime(inode); 1611 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1612 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1613 && timespec64_equal(&ts, &fattr->pre_mtime)) { 1614 inode_set_mtime_to_ts(inode, fattr->mtime); 1615 } 1616 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1617 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1618 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1619 && !nfs_have_writebacks(inode)) { 1620 trace_nfs_size_wcc(inode, fattr->size); 1621 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1622 } 1623 } 1624 1625 /** 1626 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1627 * @inode: pointer to inode 1628 * @fattr: updated attributes 1629 * 1630 * Verifies the attribute cache. If we have just changed the attributes, 1631 * so that fattr carries weak cache consistency data, then it may 1632 * also update the ctime/mtime/change_attribute. 1633 */ 1634 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1635 { 1636 struct nfs_inode *nfsi = NFS_I(inode); 1637 loff_t cur_size, new_isize; 1638 unsigned long invalid = 0; 1639 struct timespec64 ts; 1640 1641 if (nfs_have_delegated_attributes(inode)) 1642 return 0; 1643 1644 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 1645 /* Only a mounted-on-fileid? Just exit */ 1646 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1647 return 0; 1648 /* Has the inode gone and changed behind our back? */ 1649 } else if (nfsi->fileid != fattr->fileid) { 1650 /* Is this perhaps the mounted-on fileid? */ 1651 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 1652 nfsi->fileid == fattr->mounted_on_fileid) 1653 return 0; 1654 return -ESTALE; 1655 } 1656 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) 1657 return -ESTALE; 1658 1659 1660 if (!nfs_file_has_buffered_writers(nfsi)) { 1661 /* Verify a few of the more important attributes */ 1662 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) 1663 invalid |= NFS_INO_INVALID_CHANGE; 1664 1665 ts = inode_get_mtime(inode); 1666 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) 1667 invalid |= NFS_INO_INVALID_MTIME; 1668 1669 ts = inode_get_ctime(inode); 1670 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime)) 1671 invalid |= NFS_INO_INVALID_CTIME; 1672 1673 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1674 cur_size = i_size_read(inode); 1675 new_isize = nfs_size_to_loff_t(fattr->size); 1676 if (cur_size != new_isize) 1677 invalid |= NFS_INO_INVALID_SIZE; 1678 } 1679 } 1680 1681 /* Have any file permissions changed? */ 1682 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1683 invalid |= NFS_INO_INVALID_MODE; 1684 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1685 invalid |= NFS_INO_INVALID_OTHER; 1686 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1687 invalid |= NFS_INO_INVALID_OTHER; 1688 1689 /* Has the link count changed? */ 1690 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1691 invalid |= NFS_INO_INVALID_NLINK; 1692 1693 ts = inode_get_atime(inode); 1694 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime)) 1695 invalid |= NFS_INO_INVALID_ATIME; 1696 1697 if (invalid != 0) 1698 nfs_set_cache_invalid(inode, invalid); 1699 1700 nfsi->read_cache_jiffies = fattr->time_start; 1701 return 0; 1702 } 1703 1704 static atomic_long_t nfs_attr_generation_counter; 1705 1706 static unsigned long nfs_read_attr_generation_counter(void) 1707 { 1708 return atomic_long_read(&nfs_attr_generation_counter); 1709 } 1710 1711 unsigned long nfs_inc_attr_generation_counter(void) 1712 { 1713 return atomic_long_inc_return(&nfs_attr_generation_counter); 1714 } 1715 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1716 1717 void nfs_fattr_init(struct nfs_fattr *fattr) 1718 { 1719 fattr->valid = 0; 1720 fattr->time_start = jiffies; 1721 fattr->gencount = nfs_inc_attr_generation_counter(); 1722 fattr->owner_name = NULL; 1723 fattr->group_name = NULL; 1724 fattr->mdsthreshold = NULL; 1725 } 1726 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1727 1728 /** 1729 * nfs_fattr_set_barrier 1730 * @fattr: attributes 1731 * 1732 * Used to set a barrier after an attribute was updated. This 1733 * barrier ensures that older attributes from RPC calls that may 1734 * have raced with our update cannot clobber these new values. 1735 * Note that you are still responsible for ensuring that other 1736 * operations which change the attribute on the server do not 1737 * collide. 1738 */ 1739 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1740 { 1741 fattr->gencount = nfs_inc_attr_generation_counter(); 1742 } 1743 1744 struct nfs_fattr *nfs_alloc_fattr(void) 1745 { 1746 struct nfs_fattr *fattr; 1747 1748 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL); 1749 if (fattr != NULL) { 1750 nfs_fattr_init(fattr); 1751 fattr->label = NULL; 1752 } 1753 return fattr; 1754 } 1755 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1756 1757 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server) 1758 { 1759 struct nfs_fattr *fattr = nfs_alloc_fattr(); 1760 1761 if (!fattr) 1762 return NULL; 1763 1764 fattr->label = nfs4_label_alloc(server, GFP_KERNEL); 1765 if (IS_ERR(fattr->label)) { 1766 kfree(fattr); 1767 return NULL; 1768 } 1769 1770 return fattr; 1771 } 1772 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label); 1773 1774 struct nfs_fh *nfs_alloc_fhandle(void) 1775 { 1776 struct nfs_fh *fh; 1777 1778 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); 1779 if (fh != NULL) 1780 fh->size = 0; 1781 return fh; 1782 } 1783 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1784 1785 #ifdef NFS_DEBUG 1786 /* 1787 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1788 * in the same way that wireshark does 1789 * 1790 * @fh: file handle 1791 * 1792 * For debugging only. 1793 */ 1794 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1795 { 1796 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1797 * not on the result */ 1798 return nfs_fhandle_hash(fh); 1799 } 1800 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1801 1802 /* 1803 * _nfs_display_fhandle - display an NFS file handle on the console 1804 * 1805 * @fh: file handle to display 1806 * @caption: display caption 1807 * 1808 * For debugging only. 1809 */ 1810 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1811 { 1812 unsigned short i; 1813 1814 if (fh == NULL || fh->size == 0) { 1815 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1816 return; 1817 } 1818 1819 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1820 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1821 for (i = 0; i < fh->size; i += 16) { 1822 __be32 *pos = (__be32 *)&fh->data[i]; 1823 1824 switch ((fh->size - i - 1) >> 2) { 1825 case 0: 1826 printk(KERN_DEFAULT " %08x\n", 1827 be32_to_cpup(pos)); 1828 break; 1829 case 1: 1830 printk(KERN_DEFAULT " %08x %08x\n", 1831 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1832 break; 1833 case 2: 1834 printk(KERN_DEFAULT " %08x %08x %08x\n", 1835 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1836 be32_to_cpup(pos + 2)); 1837 break; 1838 default: 1839 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1840 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1841 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1842 } 1843 } 1844 } 1845 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1846 #endif 1847 1848 /** 1849 * nfs_inode_attrs_cmp_generic - compare attributes 1850 * @fattr: attributes 1851 * @inode: pointer to inode 1852 * 1853 * Attempt to divine whether or not an RPC call reply carrying stale 1854 * attributes got scheduled after another call carrying updated ones. 1855 * Note also the check for wraparound of 'attr_gencount' 1856 * 1857 * The function returns '1' if it thinks the attributes in @fattr are 1858 * more recent than the ones cached in @inode. Otherwise it returns 1859 * the value '0'. 1860 */ 1861 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr, 1862 const struct inode *inode) 1863 { 1864 unsigned long attr_gencount = NFS_I(inode)->attr_gencount; 1865 1866 return (long)(fattr->gencount - attr_gencount) > 0 || 1867 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; 1868 } 1869 1870 /** 1871 * nfs_inode_attrs_cmp_monotonic - compare attributes 1872 * @fattr: attributes 1873 * @inode: pointer to inode 1874 * 1875 * Attempt to divine whether or not an RPC call reply carrying stale 1876 * attributes got scheduled after another call carrying updated ones. 1877 * 1878 * We assume that the server observes monotonic semantics for 1879 * the change attribute, so a larger value means that the attributes in 1880 * @fattr are more recent, in which case the function returns the 1881 * value '1'. 1882 * A return value of '0' indicates no measurable change 1883 * A return value of '-1' means that the attributes in @inode are 1884 * more recent. 1885 */ 1886 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr, 1887 const struct inode *inode) 1888 { 1889 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode); 1890 if (diff > 0) 1891 return 1; 1892 return diff == 0 ? 0 : -1; 1893 } 1894 1895 /** 1896 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes 1897 * @fattr: attributes 1898 * @inode: pointer to inode 1899 * 1900 * Attempt to divine whether or not an RPC call reply carrying stale 1901 * attributes got scheduled after another call carrying updated ones. 1902 * 1903 * We assume that the server observes strictly monotonic semantics for 1904 * the change attribute, so a larger value means that the attributes in 1905 * @fattr are more recent, in which case the function returns the 1906 * value '1'. 1907 * A return value of '-1' means that the attributes in @inode are 1908 * more recent or unchanged. 1909 */ 1910 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr, 1911 const struct inode *inode) 1912 { 1913 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1; 1914 } 1915 1916 /** 1917 * nfs_inode_attrs_cmp - compare attributes 1918 * @fattr: attributes 1919 * @inode: pointer to inode 1920 * 1921 * This function returns '1' if it thinks the attributes in @fattr are 1922 * more recent than the ones cached in @inode. It returns '-1' if 1923 * the attributes in @inode are more recent than the ones in @fattr, 1924 * and it returns 0 if not sure. 1925 */ 1926 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr, 1927 const struct inode *inode) 1928 { 1929 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0) 1930 return 1; 1931 switch (NFS_SERVER(inode)->change_attr_type) { 1932 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1933 break; 1934 case NFS4_CHANGE_TYPE_IS_TIME_METADATA: 1935 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1936 break; 1937 return nfs_inode_attrs_cmp_monotonic(fattr, inode); 1938 default: 1939 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1940 break; 1941 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode); 1942 } 1943 return 0; 1944 } 1945 1946 /** 1947 * nfs_inode_finish_partial_attr_update - complete a previous inode update 1948 * @fattr: attributes 1949 * @inode: pointer to inode 1950 * 1951 * Returns '1' if the last attribute update left the inode cached 1952 * attributes in a partially unrevalidated state, and @fattr 1953 * matches the change attribute of that partial update. 1954 * Otherwise returns '0'. 1955 */ 1956 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr, 1957 const struct inode *inode) 1958 { 1959 const unsigned long check_valid = 1960 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME | 1961 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 1962 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER | 1963 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME; 1964 unsigned long cache_validity = NFS_I(inode)->cache_validity; 1965 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type; 1966 1967 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED && 1968 !(cache_validity & NFS_INO_INVALID_CHANGE) && 1969 (cache_validity & check_valid) != 0 && 1970 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1971 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0) 1972 return 1; 1973 return 0; 1974 } 1975 1976 static void nfs_ooo_merge(struct nfs_inode *nfsi, 1977 u64 start, u64 end) 1978 { 1979 int i, cnt; 1980 1981 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) 1982 /* No point merging anything */ 1983 return; 1984 1985 if (!nfsi->ooo) { 1986 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC); 1987 if (!nfsi->ooo) { 1988 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 1989 return; 1990 } 1991 nfsi->ooo->cnt = 0; 1992 } 1993 1994 /* add this range, merging if possible */ 1995 cnt = nfsi->ooo->cnt; 1996 for (i = 0; i < cnt; i++) { 1997 if (end == nfsi->ooo->gap[i].start) 1998 end = nfsi->ooo->gap[i].end; 1999 else if (start == nfsi->ooo->gap[i].end) 2000 start = nfsi->ooo->gap[i].start; 2001 else 2002 continue; 2003 /* Remove 'i' from table and loop to insert the new range */ 2004 cnt -= 1; 2005 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt]; 2006 i = -1; 2007 } 2008 if (start != end) { 2009 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) { 2010 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 2011 kfree(nfsi->ooo); 2012 nfsi->ooo = NULL; 2013 return; 2014 } 2015 nfsi->ooo->gap[cnt].start = start; 2016 nfsi->ooo->gap[cnt].end = end; 2017 cnt += 1; 2018 } 2019 nfsi->ooo->cnt = cnt; 2020 } 2021 2022 static void nfs_ooo_record(struct nfs_inode *nfsi, 2023 struct nfs_fattr *fattr) 2024 { 2025 /* This reply was out-of-order, so record in the 2026 * pre/post change id, possibly cancelling 2027 * gaps created when iversion was jumpped forward. 2028 */ 2029 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) && 2030 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) 2031 nfs_ooo_merge(nfsi, 2032 fattr->change_attr, 2033 fattr->pre_change_attr); 2034 } 2035 2036 static int nfs_refresh_inode_locked(struct inode *inode, 2037 struct nfs_fattr *fattr) 2038 { 2039 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 2040 int ret = 0; 2041 2042 trace_nfs_refresh_inode_enter(inode); 2043 2044 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode)) 2045 ret = nfs_update_inode(inode, fattr); 2046 else { 2047 nfs_ooo_record(NFS_I(inode), fattr); 2048 2049 if (attr_cmp == 0) 2050 ret = nfs_check_inode_attributes(inode, fattr); 2051 } 2052 2053 trace_nfs_refresh_inode_exit(inode, ret); 2054 return ret; 2055 } 2056 2057 /** 2058 * nfs_refresh_inode - try to update the inode attribute cache 2059 * @inode: pointer to inode 2060 * @fattr: updated attributes 2061 * 2062 * Check that an RPC call that returned attributes has not overlapped with 2063 * other recent updates of the inode metadata, then decide whether it is 2064 * safe to do a full update of the inode attributes, or whether just to 2065 * call nfs_check_inode_attributes. 2066 */ 2067 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 2068 { 2069 int status; 2070 2071 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 2072 return 0; 2073 spin_lock(&inode->i_lock); 2074 status = nfs_refresh_inode_locked(inode, fattr); 2075 spin_unlock(&inode->i_lock); 2076 2077 return status; 2078 } 2079 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 2080 2081 static int nfs_post_op_update_inode_locked(struct inode *inode, 2082 struct nfs_fattr *fattr, unsigned int invalid) 2083 { 2084 if (S_ISDIR(inode->i_mode)) 2085 invalid |= NFS_INO_INVALID_DATA; 2086 nfs_set_cache_invalid(inode, invalid); 2087 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 2088 return 0; 2089 return nfs_refresh_inode_locked(inode, fattr); 2090 } 2091 2092 /** 2093 * nfs_post_op_update_inode - try to update the inode attribute cache 2094 * @inode: pointer to inode 2095 * @fattr: updated attributes 2096 * 2097 * After an operation that has changed the inode metadata, mark the 2098 * attribute cache as being invalid, then try to update it. 2099 * 2100 * NB: if the server didn't return any post op attributes, this 2101 * function will force the retrieval of attributes before the next 2102 * NFS request. Thus it should be used only for operations that 2103 * are expected to change one or more attributes, to avoid 2104 * unnecessary NFS requests and trips through nfs_update_inode(). 2105 */ 2106 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 2107 { 2108 int status; 2109 2110 spin_lock(&inode->i_lock); 2111 nfs_fattr_set_barrier(fattr); 2112 status = nfs_post_op_update_inode_locked(inode, fattr, 2113 NFS_INO_INVALID_CHANGE 2114 | NFS_INO_INVALID_CTIME 2115 | NFS_INO_REVAL_FORCED); 2116 spin_unlock(&inode->i_lock); 2117 2118 return status; 2119 } 2120 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 2121 2122 /** 2123 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 2124 * @inode: pointer to inode 2125 * @fattr: updated attributes 2126 * 2127 * After an operation that has changed the inode metadata, mark the 2128 * attribute cache as being invalid, then try to update it. Fake up 2129 * weak cache consistency data, if none exist. 2130 * 2131 * This function is mainly designed to be used by the ->write_done() functions. 2132 */ 2133 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 2134 { 2135 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 2136 int status; 2137 2138 /* Don't do a WCC update if these attributes are already stale */ 2139 if (attr_cmp < 0) 2140 return 0; 2141 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) { 2142 /* Record the pre/post change info before clearing PRECHANGE */ 2143 nfs_ooo_record(NFS_I(inode), fattr); 2144 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 2145 | NFS_ATTR_FATTR_PRESIZE 2146 | NFS_ATTR_FATTR_PREMTIME 2147 | NFS_ATTR_FATTR_PRECTIME); 2148 goto out_noforce; 2149 } 2150 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 2151 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 2152 fattr->pre_change_attr = inode_peek_iversion_raw(inode); 2153 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 2154 } 2155 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 2156 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 2157 fattr->pre_ctime = inode_get_ctime(inode); 2158 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 2159 } 2160 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 2161 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 2162 fattr->pre_mtime = inode_get_mtime(inode); 2163 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 2164 } 2165 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 2166 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 2167 fattr->pre_size = i_size_read(inode); 2168 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 2169 } 2170 out_noforce: 2171 status = nfs_post_op_update_inode_locked(inode, fattr, 2172 NFS_INO_INVALID_CHANGE 2173 | NFS_INO_INVALID_CTIME 2174 | NFS_INO_INVALID_MTIME 2175 | NFS_INO_INVALID_BLOCKS); 2176 return status; 2177 } 2178 2179 /** 2180 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 2181 * @inode: pointer to inode 2182 * @fattr: updated attributes 2183 * 2184 * After an operation that has changed the inode metadata, mark the 2185 * attribute cache as being invalid, then try to update it. Fake up 2186 * weak cache consistency data, if none exist. 2187 * 2188 * This function is mainly designed to be used by the ->write_done() functions. 2189 */ 2190 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 2191 { 2192 int status; 2193 2194 spin_lock(&inode->i_lock); 2195 nfs_fattr_set_barrier(fattr); 2196 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 2197 spin_unlock(&inode->i_lock); 2198 return status; 2199 } 2200 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 2201 2202 2203 /* 2204 * Many nfs protocol calls return the new file attributes after 2205 * an operation. Here we update the inode to reflect the state 2206 * of the server's inode. 2207 * 2208 * This is a bit tricky because we have to make sure all dirty pages 2209 * have been sent off to the server before calling invalidate_inode_pages. 2210 * To make sure no other process adds more write requests while we try 2211 * our best to flush them, we make them sleep during the attribute refresh. 2212 * 2213 * A very similar scenario holds for the dir cache. 2214 */ 2215 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 2216 { 2217 struct nfs_server *server = NFS_SERVER(inode); 2218 struct nfs_inode *nfsi = NFS_I(inode); 2219 loff_t cur_isize, new_isize; 2220 u64 fattr_supported = server->fattr_valid; 2221 unsigned long invalid = 0; 2222 unsigned long now = jiffies; 2223 unsigned long save_cache_validity; 2224 bool have_writers = nfs_file_has_buffered_writers(nfsi); 2225 bool cache_revalidated = true; 2226 bool attr_changed = false; 2227 bool have_delegation; 2228 2229 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n", 2230 __func__, inode->i_sb->s_id, inode->i_ino, 2231 nfs_display_fhandle_hash(NFS_FH(inode)), 2232 atomic_read(&inode->i_count), fattr->valid); 2233 2234 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 2235 /* Only a mounted-on-fileid? Just exit */ 2236 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 2237 return 0; 2238 /* Has the inode gone and changed behind our back? */ 2239 } else if (nfsi->fileid != fattr->fileid) { 2240 /* Is this perhaps the mounted-on fileid? */ 2241 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 2242 nfsi->fileid == fattr->mounted_on_fileid) 2243 return 0; 2244 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 2245 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 2246 NFS_SERVER(inode)->nfs_client->cl_hostname, 2247 inode->i_sb->s_id, (long long)nfsi->fileid, 2248 (long long)fattr->fileid); 2249 goto out_err; 2250 } 2251 2252 /* 2253 * Make sure the inode's type hasn't changed. 2254 */ 2255 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) { 2256 /* 2257 * Big trouble! The inode has become a different object. 2258 */ 2259 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 2260 __func__, inode->i_ino, inode->i_mode, fattr->mode); 2261 goto out_err; 2262 } 2263 2264 /* Update the fsid? */ 2265 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 2266 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 2267 !IS_AUTOMOUNT(inode)) 2268 server->fsid = fattr->fsid; 2269 2270 /* Save the delegation state before clearing cache_validity */ 2271 have_delegation = nfs_have_delegated_attributes(inode); 2272 2273 /* 2274 * Update the read time so we don't revalidate too often. 2275 */ 2276 nfsi->read_cache_jiffies = fattr->time_start; 2277 2278 /* Fix up any delegated attributes in the struct nfs_fattr */ 2279 nfs_fattr_fixup_delegated(inode, fattr); 2280 2281 save_cache_validity = nfsi->cache_validity; 2282 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 2283 | NFS_INO_INVALID_ATIME 2284 | NFS_INO_REVAL_FORCED 2285 | NFS_INO_INVALID_BLOCKS); 2286 2287 /* Do atomic weak cache consistency updates */ 2288 nfs_wcc_update_inode(inode, fattr); 2289 2290 if (pnfs_layoutcommit_outstanding(inode)) { 2291 nfsi->cache_validity |= 2292 save_cache_validity & 2293 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 2294 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 2295 NFS_INO_INVALID_BLOCKS); 2296 cache_revalidated = false; 2297 } 2298 2299 /* More cache consistency checks */ 2300 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 2301 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 && 2302 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) { 2303 /* There is one remaining gap that hasn't been 2304 * merged into iversion - do that now. 2305 */ 2306 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start); 2307 kfree(nfsi->ooo); 2308 nfsi->ooo = NULL; 2309 } 2310 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { 2311 /* Could it be a race with writeback? */ 2312 if (!(have_writers || have_delegation)) { 2313 invalid |= NFS_INO_INVALID_DATA 2314 | NFS_INO_INVALID_ACCESS 2315 | NFS_INO_INVALID_ACL 2316 | NFS_INO_INVALID_XATTR; 2317 /* Force revalidate of all attributes */ 2318 save_cache_validity |= NFS_INO_INVALID_CTIME 2319 | NFS_INO_INVALID_MTIME 2320 | NFS_INO_INVALID_SIZE 2321 | NFS_INO_INVALID_BLOCKS 2322 | NFS_INO_INVALID_NLINK 2323 | NFS_INO_INVALID_MODE 2324 | NFS_INO_INVALID_OTHER 2325 | NFS_INO_INVALID_BTIME; 2326 if (S_ISDIR(inode->i_mode)) 2327 nfs_force_lookup_revalidate(inode); 2328 attr_changed = true; 2329 dprintk("NFS: change_attr change on server for file %s/%ld\n", 2330 inode->i_sb->s_id, 2331 inode->i_ino); 2332 } else if (!have_delegation) { 2333 nfs_ooo_record(nfsi, fattr); 2334 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode), 2335 fattr->change_attr); 2336 } 2337 inode_set_iversion_raw(inode, fattr->change_attr); 2338 } 2339 } else { 2340 nfsi->cache_validity |= 2341 save_cache_validity & NFS_INO_INVALID_CHANGE; 2342 if (!have_delegation || 2343 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0) 2344 cache_revalidated = false; 2345 } 2346 2347 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 2348 inode_set_mtime_to_ts(inode, fattr->mtime); 2349 else if (fattr_supported & NFS_ATTR_FATTR_MTIME) 2350 nfsi->cache_validity |= 2351 save_cache_validity & NFS_INO_INVALID_MTIME; 2352 2353 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 2354 inode_set_ctime_to_ts(inode, fattr->ctime); 2355 else if (fattr_supported & NFS_ATTR_FATTR_CTIME) 2356 nfsi->cache_validity |= 2357 save_cache_validity & NFS_INO_INVALID_CTIME; 2358 2359 if (fattr->valid & NFS_ATTR_FATTR_BTIME) 2360 nfsi->btime = fattr->btime; 2361 else if (fattr_supported & NFS_ATTR_FATTR_BTIME) 2362 nfsi->cache_validity |= 2363 save_cache_validity & NFS_INO_INVALID_BTIME; 2364 2365 /* Check if our cached file size is stale */ 2366 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 2367 new_isize = nfs_size_to_loff_t(fattr->size); 2368 cur_isize = i_size_read(inode); 2369 if (new_isize != cur_isize && !have_delegation) { 2370 /* Do we perhaps have any outstanding writes, or has 2371 * the file grown beyond our last write? */ 2372 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 2373 trace_nfs_size_update(inode, new_isize); 2374 i_size_write(inode, new_isize); 2375 if (!have_writers) 2376 invalid |= NFS_INO_INVALID_DATA; 2377 } 2378 } 2379 if (new_isize == 0 && 2380 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED | 2381 NFS_ATTR_FATTR_BLOCKS_USED))) { 2382 fattr->du.nfs3.used = 0; 2383 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED; 2384 } 2385 } else 2386 nfsi->cache_validity |= 2387 save_cache_validity & NFS_INO_INVALID_SIZE; 2388 2389 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 2390 inode_set_atime_to_ts(inode, fattr->atime); 2391 else if (fattr_supported & NFS_ATTR_FATTR_ATIME) 2392 nfsi->cache_validity |= 2393 save_cache_validity & NFS_INO_INVALID_ATIME; 2394 2395 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 2396 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 2397 umode_t newmode = inode->i_mode & S_IFMT; 2398 newmode |= fattr->mode & S_IALLUGO; 2399 inode->i_mode = newmode; 2400 invalid |= NFS_INO_INVALID_ACCESS 2401 | NFS_INO_INVALID_ACL; 2402 } 2403 } else if (fattr_supported & NFS_ATTR_FATTR_MODE) 2404 nfsi->cache_validity |= 2405 save_cache_validity & NFS_INO_INVALID_MODE; 2406 2407 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 2408 if (!uid_eq(inode->i_uid, fattr->uid)) { 2409 invalid |= NFS_INO_INVALID_ACCESS 2410 | NFS_INO_INVALID_ACL; 2411 inode->i_uid = fattr->uid; 2412 } 2413 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER) 2414 nfsi->cache_validity |= 2415 save_cache_validity & NFS_INO_INVALID_OTHER; 2416 2417 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 2418 if (!gid_eq(inode->i_gid, fattr->gid)) { 2419 invalid |= NFS_INO_INVALID_ACCESS 2420 | NFS_INO_INVALID_ACL; 2421 inode->i_gid = fattr->gid; 2422 } 2423 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP) 2424 nfsi->cache_validity |= 2425 save_cache_validity & NFS_INO_INVALID_OTHER; 2426 2427 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 2428 if (inode->i_nlink != fattr->nlink) 2429 set_nlink(inode, fattr->nlink); 2430 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK) 2431 nfsi->cache_validity |= 2432 save_cache_validity & NFS_INO_INVALID_NLINK; 2433 2434 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 2435 /* 2436 * report the blocks in 512byte units 2437 */ 2438 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 2439 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED) 2440 nfsi->cache_validity |= 2441 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2442 2443 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 2444 inode->i_blocks = fattr->du.nfs2.blocks; 2445 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED) 2446 nfsi->cache_validity |= 2447 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2448 2449 /* Update attrtimeo value if we're out of the unstable period */ 2450 if (attr_changed) { 2451 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 2452 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 2453 nfsi->attrtimeo_timestamp = now; 2454 /* Set barrier to be more recent than all outstanding updates */ 2455 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 2456 } else { 2457 if (cache_revalidated) { 2458 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 2459 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 2460 nfsi->attrtimeo <<= 1; 2461 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 2462 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 2463 } 2464 nfsi->attrtimeo_timestamp = now; 2465 } 2466 /* Set the barrier to be more recent than this fattr */ 2467 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) 2468 nfsi->attr_gencount = fattr->gencount; 2469 } 2470 2471 /* Don't invalidate the data if we were to blame */ 2472 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 2473 || S_ISLNK(inode->i_mode))) 2474 invalid &= ~NFS_INO_INVALID_DATA; 2475 nfs_set_cache_invalid(inode, invalid); 2476 2477 return 0; 2478 out_err: 2479 /* 2480 * No need to worry about unhashing the dentry, as the 2481 * lookup validation will know that the inode is bad. 2482 * (But we fall through to invalidate the caches.) 2483 */ 2484 nfs_set_inode_stale_locked(inode); 2485 return -ESTALE; 2486 } 2487 2488 struct inode *nfs_alloc_inode(struct super_block *sb) 2489 { 2490 struct nfs_inode *nfsi; 2491 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL); 2492 if (!nfsi) 2493 return NULL; 2494 nfsi->flags = 0UL; 2495 nfsi->cache_validity = 0UL; 2496 nfsi->ooo = NULL; 2497 #if IS_ENABLED(CONFIG_NFS_V4) 2498 nfsi->nfs4_acl = NULL; 2499 #endif /* CONFIG_NFS_V4 */ 2500 #ifdef CONFIG_NFS_V4_2 2501 nfsi->xattr_cache = NULL; 2502 #endif 2503 nfs_netfs_inode_init(nfsi); 2504 2505 return &nfsi->vfs_inode; 2506 } 2507 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 2508 2509 void nfs_free_inode(struct inode *inode) 2510 { 2511 kfree(NFS_I(inode)->ooo); 2512 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 2513 } 2514 EXPORT_SYMBOL_GPL(nfs_free_inode); 2515 2516 static inline void nfs4_init_once(struct nfs_inode *nfsi) 2517 { 2518 #if IS_ENABLED(CONFIG_NFS_V4) 2519 INIT_LIST_HEAD(&nfsi->open_states); 2520 nfsi->delegation = NULL; 2521 init_rwsem(&nfsi->rwsem); 2522 nfsi->layout = NULL; 2523 #endif 2524 } 2525 2526 static void init_once(void *foo) 2527 { 2528 struct nfs_inode *nfsi = foo; 2529 2530 inode_init_once(&nfsi->vfs_inode); 2531 INIT_LIST_HEAD(&nfsi->open_files); 2532 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2533 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2534 nfs4_init_once(nfsi); 2535 } 2536 2537 static int __init nfs_init_inodecache(void) 2538 { 2539 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2540 sizeof(struct nfs_inode), 2541 0, (SLAB_RECLAIM_ACCOUNT| 2542 SLAB_ACCOUNT), 2543 init_once); 2544 if (nfs_inode_cachep == NULL) 2545 return -ENOMEM; 2546 2547 return 0; 2548 } 2549 2550 static void nfs_destroy_inodecache(void) 2551 { 2552 /* 2553 * Make sure all delayed rcu free inodes are flushed before we 2554 * destroy cache. 2555 */ 2556 rcu_barrier(); 2557 kmem_cache_destroy(nfs_inode_cachep); 2558 } 2559 2560 struct workqueue_struct *nfslocaliod_workqueue; 2561 struct workqueue_struct *nfsiod_workqueue; 2562 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2563 2564 /* 2565 * Destroy the nfsiod workqueues 2566 */ 2567 static void nfsiod_stop(void) 2568 { 2569 struct workqueue_struct *wq; 2570 2571 wq = nfsiod_workqueue; 2572 if (wq != NULL) { 2573 nfsiod_workqueue = NULL; 2574 destroy_workqueue(wq); 2575 } 2576 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2577 wq = nfslocaliod_workqueue; 2578 if (wq != NULL) { 2579 nfslocaliod_workqueue = NULL; 2580 destroy_workqueue(wq); 2581 } 2582 #endif /* CONFIG_NFS_LOCALIO */ 2583 } 2584 2585 /* 2586 * Start the nfsiod workqueues 2587 */ 2588 static int nfsiod_start(void) 2589 { 2590 dprintk("RPC: creating workqueue nfsiod\n"); 2591 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); 2592 if (nfsiod_workqueue == NULL) 2593 return -ENOMEM; 2594 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 2595 /* 2596 * localio writes need to use a normal (non-memreclaim) workqueue. 2597 * When we start getting low on space, XFS goes and calls flush_work() on 2598 * a non-memreclaim work queue, which causes a priority inversion problem. 2599 */ 2600 dprintk("RPC: creating workqueue nfslocaliod\n"); 2601 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0); 2602 if (unlikely(nfslocaliod_workqueue == NULL)) { 2603 nfsiod_stop(); 2604 return -ENOMEM; 2605 } 2606 #endif /* CONFIG_NFS_LOCALIO */ 2607 return 0; 2608 } 2609 2610 unsigned int nfs_net_id; 2611 EXPORT_SYMBOL_GPL(nfs_net_id); 2612 2613 static int nfs_net_init(struct net *net) 2614 { 2615 struct nfs_net *nn = net_generic(net, nfs_net_id); 2616 int err; 2617 2618 nfs_clients_init(net); 2619 2620 if (!rpc_proc_register(net, &nn->rpcstats)) { 2621 err = -ENOMEM; 2622 goto err_proc_rpc; 2623 } 2624 2625 err = nfs_fs_proc_net_init(net); 2626 if (err) 2627 goto err_proc_nfs; 2628 2629 return 0; 2630 2631 err_proc_nfs: 2632 rpc_proc_unregister(net, "nfs"); 2633 err_proc_rpc: 2634 nfs_clients_exit(net); 2635 return err; 2636 } 2637 2638 static void nfs_net_exit(struct net *net) 2639 { 2640 rpc_proc_unregister(net, "nfs"); 2641 nfs_fs_proc_net_exit(net); 2642 nfs_clients_exit(net); 2643 } 2644 2645 static struct pernet_operations nfs_net_ops = { 2646 .init = nfs_net_init, 2647 .exit = nfs_net_exit, 2648 .id = &nfs_net_id, 2649 .size = sizeof(struct nfs_net), 2650 }; 2651 2652 #ifdef CONFIG_KEYS 2653 static struct key *nfs_keyring; 2654 2655 static int __init nfs_init_keyring(void) 2656 { 2657 nfs_keyring = keyring_alloc(".nfs", 2658 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 2659 current_cred(), 2660 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 2661 (KEY_USR_ALL & ~KEY_USR_SETATTR), 2662 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); 2663 return PTR_ERR_OR_ZERO(nfs_keyring); 2664 } 2665 2666 static void nfs_exit_keyring(void) 2667 { 2668 key_put(nfs_keyring); 2669 } 2670 #else 2671 static inline int nfs_init_keyring(void) 2672 { 2673 return 0; 2674 } 2675 2676 static inline void nfs_exit_keyring(void) 2677 { 2678 } 2679 #endif /* CONFIG_KEYS */ 2680 2681 /* 2682 * Initialize NFS 2683 */ 2684 static int __init init_nfs_fs(void) 2685 { 2686 int err; 2687 2688 err = nfs_init_keyring(); 2689 if (err) 2690 return err; 2691 2692 err = nfs_sysfs_init(); 2693 if (err < 0) 2694 goto out10; 2695 2696 err = register_pernet_subsys(&nfs_net_ops); 2697 if (err < 0) 2698 goto out9; 2699 2700 err = nfsiod_start(); 2701 if (err) 2702 goto out7; 2703 2704 err = nfs_fs_proc_init(); 2705 if (err) 2706 goto out6; 2707 2708 err = nfs_init_nfspagecache(); 2709 if (err) 2710 goto out5; 2711 2712 err = nfs_init_inodecache(); 2713 if (err) 2714 goto out4; 2715 2716 err = nfs_init_readpagecache(); 2717 if (err) 2718 goto out3; 2719 2720 err = nfs_init_writepagecache(); 2721 if (err) 2722 goto out2; 2723 2724 err = nfs_init_directcache(); 2725 if (err) 2726 goto out1; 2727 2728 err = register_nfs_fs(); 2729 if (err) 2730 goto out0; 2731 2732 return 0; 2733 out0: 2734 nfs_destroy_directcache(); 2735 out1: 2736 nfs_destroy_writepagecache(); 2737 out2: 2738 nfs_destroy_readpagecache(); 2739 out3: 2740 nfs_destroy_inodecache(); 2741 out4: 2742 nfs_destroy_nfspagecache(); 2743 out5: 2744 nfs_fs_proc_exit(); 2745 out6: 2746 nfsiod_stop(); 2747 out7: 2748 unregister_pernet_subsys(&nfs_net_ops); 2749 out9: 2750 nfs_sysfs_exit(); 2751 out10: 2752 nfs_exit_keyring(); 2753 return err; 2754 } 2755 2756 static void __exit exit_nfs_fs(void) 2757 { 2758 nfs_destroy_directcache(); 2759 nfs_destroy_writepagecache(); 2760 nfs_destroy_readpagecache(); 2761 nfs_destroy_inodecache(); 2762 nfs_destroy_nfspagecache(); 2763 unregister_pernet_subsys(&nfs_net_ops); 2764 unregister_nfs_fs(); 2765 nfs_fs_proc_exit(); 2766 nfsiod_stop(); 2767 nfs_sysfs_exit(); 2768 nfs_exit_keyring(); 2769 } 2770 2771 /* Not quite true; I just maintain it */ 2772 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2773 MODULE_DESCRIPTION("NFS client support"); 2774 MODULE_LICENSE("GPL"); 2775 module_param(enable_ino64, bool, 0644); 2776 2777 module_init(init_nfs_fs) 2778 module_exit(exit_nfs_fs) 2779