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