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), filp->f_mode, filp); 1172 if (IS_ERR(ctx)) 1173 return PTR_ERR(ctx); 1174 nfs_file_set_open_context(filp, ctx); 1175 put_nfs_open_context(ctx); 1176 nfs_fscache_open_file(inode, filp); 1177 return 0; 1178 } 1179 1180 /* 1181 * This function is called whenever some part of NFS notices that 1182 * the cached attributes have to be refreshed. 1183 */ 1184 int 1185 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1186 { 1187 int status = -ESTALE; 1188 struct nfs_fattr *fattr = NULL; 1189 struct nfs_inode *nfsi = NFS_I(inode); 1190 1191 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1192 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1193 1194 trace_nfs_revalidate_inode_enter(inode); 1195 1196 if (is_bad_inode(inode)) 1197 goto out; 1198 if (NFS_STALE(inode)) 1199 goto out; 1200 1201 /* pNFS: Attributes aren't updated until we layoutcommit */ 1202 if (S_ISREG(inode->i_mode)) { 1203 status = pnfs_sync_inode(inode, false); 1204 if (status) 1205 goto out; 1206 } 1207 1208 status = -ENOMEM; 1209 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 1210 if (fattr == NULL) 1211 goto out; 1212 1213 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1214 1215 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode); 1216 if (status != 0) { 1217 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1218 inode->i_sb->s_id, 1219 (unsigned long long)NFS_FILEID(inode), status); 1220 switch (status) { 1221 case -ETIMEDOUT: 1222 /* A soft timeout occurred. Use cached information? */ 1223 if (server->flags & NFS_MOUNT_SOFTREVAL) 1224 status = 0; 1225 break; 1226 case -ESTALE: 1227 if (!S_ISDIR(inode->i_mode)) 1228 nfs_set_inode_stale(inode); 1229 else 1230 nfs_zap_caches(inode); 1231 } 1232 goto out; 1233 } 1234 1235 status = nfs_refresh_inode(inode, fattr); 1236 if (status) { 1237 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1238 inode->i_sb->s_id, 1239 (unsigned long long)NFS_FILEID(inode), status); 1240 goto out; 1241 } 1242 1243 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1244 nfs_zap_acl_cache(inode); 1245 1246 nfs_setsecurity(inode, fattr); 1247 1248 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1249 inode->i_sb->s_id, 1250 (unsigned long long)NFS_FILEID(inode)); 1251 1252 out: 1253 nfs_free_fattr(fattr); 1254 trace_nfs_revalidate_inode_exit(inode, status); 1255 return status; 1256 } 1257 1258 int nfs_attribute_cache_expired(struct inode *inode) 1259 { 1260 if (nfs_have_delegated_attributes(inode)) 1261 return 0; 1262 return nfs_attribute_timeout(inode); 1263 } 1264 1265 /** 1266 * nfs_revalidate_inode - Revalidate the inode attributes 1267 * @inode: pointer to inode struct 1268 * @flags: cache flags to check 1269 * 1270 * Updates inode attribute information by retrieving the data from the server. 1271 */ 1272 int nfs_revalidate_inode(struct inode *inode, unsigned long flags) 1273 { 1274 if (!nfs_check_cache_invalid(inode, flags)) 1275 return NFS_STALE(inode) ? -ESTALE : 0; 1276 return __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1277 } 1278 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1279 1280 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1281 { 1282 int ret; 1283 1284 nfs_fscache_invalidate(inode, 0); 1285 if (mapping->nrpages != 0) { 1286 if (S_ISREG(inode->i_mode)) { 1287 ret = nfs_sync_mapping(mapping); 1288 if (ret < 0) 1289 return ret; 1290 } 1291 ret = invalidate_inode_pages2(mapping); 1292 if (ret < 0) 1293 return ret; 1294 } 1295 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1296 1297 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1298 inode->i_sb->s_id, 1299 (unsigned long long)NFS_FILEID(inode)); 1300 return 0; 1301 } 1302 1303 /** 1304 * nfs_clear_invalid_mapping - Conditionally clear a mapping 1305 * @mapping: pointer to mapping 1306 * 1307 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping. 1308 */ 1309 int nfs_clear_invalid_mapping(struct address_space *mapping) 1310 { 1311 struct inode *inode = mapping->host; 1312 struct nfs_inode *nfsi = NFS_I(inode); 1313 unsigned long *bitlock = &nfsi->flags; 1314 int ret = 0; 1315 1316 /* 1317 * We must clear NFS_INO_INVALID_DATA first to ensure that 1318 * invalidations that come in while we're shooting down the mappings 1319 * are respected. But, that leaves a race window where one revalidator 1320 * can clear the flag, and then another checks it before the mapping 1321 * gets invalidated. Fix that by serializing access to this part of 1322 * the function. 1323 * 1324 * At the same time, we need to allow other tasks to see whether we 1325 * might be in the middle of invalidating the pages, so we only set 1326 * the bit lock here if it looks like we're going to be doing that. 1327 */ 1328 for (;;) { 1329 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1330 nfs_wait_bit_killable, 1331 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 1332 if (ret) 1333 goto out; 1334 spin_lock(&inode->i_lock); 1335 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1336 spin_unlock(&inode->i_lock); 1337 continue; 1338 } 1339 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1340 break; 1341 spin_unlock(&inode->i_lock); 1342 goto out; 1343 } 1344 1345 set_bit(NFS_INO_INVALIDATING, bitlock); 1346 smp_wmb(); 1347 nfsi->cache_validity &= 1348 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER); 1349 spin_unlock(&inode->i_lock); 1350 trace_nfs_invalidate_mapping_enter(inode); 1351 ret = nfs_invalidate_mapping(inode, mapping); 1352 trace_nfs_invalidate_mapping_exit(inode, ret); 1353 1354 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1355 smp_mb__after_atomic(); 1356 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1357 out: 1358 return ret; 1359 } 1360 1361 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1362 { 1363 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) || 1364 NFS_STALE(inode); 1365 } 1366 1367 int nfs_revalidate_mapping_rcu(struct inode *inode) 1368 { 1369 struct nfs_inode *nfsi = NFS_I(inode); 1370 unsigned long *bitlock = &nfsi->flags; 1371 int ret = 0; 1372 1373 if (IS_SWAPFILE(inode)) 1374 goto out; 1375 if (nfs_mapping_need_revalidate_inode(inode)) { 1376 ret = -ECHILD; 1377 goto out; 1378 } 1379 spin_lock(&inode->i_lock); 1380 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1381 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1382 ret = -ECHILD; 1383 spin_unlock(&inode->i_lock); 1384 out: 1385 return ret; 1386 } 1387 1388 /** 1389 * nfs_revalidate_mapping - Revalidate the pagecache 1390 * @inode: pointer to host inode 1391 * @mapping: pointer to mapping 1392 */ 1393 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1394 { 1395 /* swapfiles are not supposed to be shared. */ 1396 if (IS_SWAPFILE(inode)) 1397 return 0; 1398 1399 if (nfs_mapping_need_revalidate_inode(inode)) { 1400 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1401 if (ret < 0) 1402 return ret; 1403 } 1404 1405 return nfs_clear_invalid_mapping(mapping); 1406 } 1407 1408 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1409 { 1410 struct inode *inode = &nfsi->vfs_inode; 1411 1412 if (!S_ISREG(inode->i_mode)) 1413 return false; 1414 if (list_empty(&nfsi->open_files)) 1415 return false; 1416 return inode_is_open_for_write(inode); 1417 } 1418 1419 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1420 { 1421 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1422 } 1423 1424 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1425 { 1426 struct timespec64 ts; 1427 1428 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1429 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1430 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { 1431 inode_set_iversion_raw(inode, fattr->change_attr); 1432 if (S_ISDIR(inode->i_mode)) 1433 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1434 else if (nfs_server_capable(inode, NFS_CAP_XATTR)) 1435 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); 1436 } 1437 /* If we have atomic WCC data, we may update some attributes */ 1438 ts = inode->i_ctime; 1439 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1440 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1441 && timespec64_equal(&ts, &fattr->pre_ctime)) { 1442 inode->i_ctime = fattr->ctime; 1443 } 1444 1445 ts = inode->i_mtime; 1446 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1447 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1448 && timespec64_equal(&ts, &fattr->pre_mtime)) { 1449 inode->i_mtime = fattr->mtime; 1450 } 1451 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1452 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1453 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1454 && !nfs_have_writebacks(inode)) { 1455 trace_nfs_size_wcc(inode, fattr->size); 1456 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1457 } 1458 } 1459 1460 /** 1461 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1462 * @inode: pointer to inode 1463 * @fattr: updated attributes 1464 * 1465 * Verifies the attribute cache. If we have just changed the attributes, 1466 * so that fattr carries weak cache consistency data, then it may 1467 * also update the ctime/mtime/change_attribute. 1468 */ 1469 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1470 { 1471 struct nfs_inode *nfsi = NFS_I(inode); 1472 loff_t cur_size, new_isize; 1473 unsigned long invalid = 0; 1474 struct timespec64 ts; 1475 1476 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1477 return 0; 1478 1479 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 1480 /* Only a mounted-on-fileid? Just exit */ 1481 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1482 return 0; 1483 /* Has the inode gone and changed behind our back? */ 1484 } else if (nfsi->fileid != fattr->fileid) { 1485 /* Is this perhaps the mounted-on fileid? */ 1486 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 1487 nfsi->fileid == fattr->mounted_on_fileid) 1488 return 0; 1489 return -ESTALE; 1490 } 1491 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) 1492 return -ESTALE; 1493 1494 1495 if (!nfs_file_has_buffered_writers(nfsi)) { 1496 /* Verify a few of the more important attributes */ 1497 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) 1498 invalid |= NFS_INO_INVALID_CHANGE; 1499 1500 ts = inode->i_mtime; 1501 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) 1502 invalid |= NFS_INO_INVALID_MTIME; 1503 1504 ts = inode->i_ctime; 1505 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime)) 1506 invalid |= NFS_INO_INVALID_CTIME; 1507 1508 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1509 cur_size = i_size_read(inode); 1510 new_isize = nfs_size_to_loff_t(fattr->size); 1511 if (cur_size != new_isize) 1512 invalid |= NFS_INO_INVALID_SIZE; 1513 } 1514 } 1515 1516 /* Have any file permissions changed? */ 1517 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1518 invalid |= NFS_INO_INVALID_MODE; 1519 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1520 invalid |= NFS_INO_INVALID_OTHER; 1521 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1522 invalid |= NFS_INO_INVALID_OTHER; 1523 1524 /* Has the link count changed? */ 1525 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1526 invalid |= NFS_INO_INVALID_NLINK; 1527 1528 ts = inode->i_atime; 1529 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime)) 1530 invalid |= NFS_INO_INVALID_ATIME; 1531 1532 if (invalid != 0) 1533 nfs_set_cache_invalid(inode, invalid); 1534 1535 nfsi->read_cache_jiffies = fattr->time_start; 1536 return 0; 1537 } 1538 1539 static atomic_long_t nfs_attr_generation_counter; 1540 1541 static unsigned long nfs_read_attr_generation_counter(void) 1542 { 1543 return atomic_long_read(&nfs_attr_generation_counter); 1544 } 1545 1546 unsigned long nfs_inc_attr_generation_counter(void) 1547 { 1548 return atomic_long_inc_return(&nfs_attr_generation_counter); 1549 } 1550 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1551 1552 void nfs_fattr_init(struct nfs_fattr *fattr) 1553 { 1554 fattr->valid = 0; 1555 fattr->time_start = jiffies; 1556 fattr->gencount = nfs_inc_attr_generation_counter(); 1557 fattr->owner_name = NULL; 1558 fattr->group_name = NULL; 1559 } 1560 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1561 1562 /** 1563 * nfs_fattr_set_barrier 1564 * @fattr: attributes 1565 * 1566 * Used to set a barrier after an attribute was updated. This 1567 * barrier ensures that older attributes from RPC calls that may 1568 * have raced with our update cannot clobber these new values. 1569 * Note that you are still responsible for ensuring that other 1570 * operations which change the attribute on the server do not 1571 * collide. 1572 */ 1573 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1574 { 1575 fattr->gencount = nfs_inc_attr_generation_counter(); 1576 } 1577 1578 struct nfs_fattr *nfs_alloc_fattr(void) 1579 { 1580 struct nfs_fattr *fattr; 1581 1582 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL); 1583 if (fattr != NULL) { 1584 nfs_fattr_init(fattr); 1585 fattr->label = NULL; 1586 } 1587 return fattr; 1588 } 1589 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1590 1591 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server) 1592 { 1593 struct nfs_fattr *fattr = nfs_alloc_fattr(); 1594 1595 if (!fattr) 1596 return NULL; 1597 1598 fattr->label = nfs4_label_alloc(server, GFP_KERNEL); 1599 if (IS_ERR(fattr->label)) { 1600 kfree(fattr); 1601 return NULL; 1602 } 1603 1604 return fattr; 1605 } 1606 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label); 1607 1608 struct nfs_fh *nfs_alloc_fhandle(void) 1609 { 1610 struct nfs_fh *fh; 1611 1612 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); 1613 if (fh != NULL) 1614 fh->size = 0; 1615 return fh; 1616 } 1617 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1618 1619 #ifdef NFS_DEBUG 1620 /* 1621 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1622 * in the same way that wireshark does 1623 * 1624 * @fh: file handle 1625 * 1626 * For debugging only. 1627 */ 1628 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1629 { 1630 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1631 * not on the result */ 1632 return nfs_fhandle_hash(fh); 1633 } 1634 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1635 1636 /* 1637 * _nfs_display_fhandle - display an NFS file handle on the console 1638 * 1639 * @fh: file handle to display 1640 * @caption: display caption 1641 * 1642 * For debugging only. 1643 */ 1644 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1645 { 1646 unsigned short i; 1647 1648 if (fh == NULL || fh->size == 0) { 1649 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1650 return; 1651 } 1652 1653 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1654 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1655 for (i = 0; i < fh->size; i += 16) { 1656 __be32 *pos = (__be32 *)&fh->data[i]; 1657 1658 switch ((fh->size - i - 1) >> 2) { 1659 case 0: 1660 printk(KERN_DEFAULT " %08x\n", 1661 be32_to_cpup(pos)); 1662 break; 1663 case 1: 1664 printk(KERN_DEFAULT " %08x %08x\n", 1665 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1666 break; 1667 case 2: 1668 printk(KERN_DEFAULT " %08x %08x %08x\n", 1669 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1670 be32_to_cpup(pos + 2)); 1671 break; 1672 default: 1673 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1674 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1675 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1676 } 1677 } 1678 } 1679 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1680 #endif 1681 1682 /** 1683 * nfs_inode_attrs_cmp_generic - compare attributes 1684 * @fattr: attributes 1685 * @inode: pointer to inode 1686 * 1687 * Attempt to divine whether or not an RPC call reply carrying stale 1688 * attributes got scheduled after another call carrying updated ones. 1689 * Note also the check for wraparound of 'attr_gencount' 1690 * 1691 * The function returns '1' if it thinks the attributes in @fattr are 1692 * more recent than the ones cached in @inode. Otherwise it returns 1693 * the value '0'. 1694 */ 1695 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr, 1696 const struct inode *inode) 1697 { 1698 unsigned long attr_gencount = NFS_I(inode)->attr_gencount; 1699 1700 return (long)(fattr->gencount - attr_gencount) > 0 || 1701 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; 1702 } 1703 1704 /** 1705 * nfs_inode_attrs_cmp_monotonic - compare attributes 1706 * @fattr: attributes 1707 * @inode: pointer to inode 1708 * 1709 * Attempt to divine whether or not an RPC call reply carrying stale 1710 * attributes got scheduled after another call carrying updated ones. 1711 * 1712 * We assume that the server observes monotonic semantics for 1713 * the change attribute, so a larger value means that the attributes in 1714 * @fattr are more recent, in which case the function returns the 1715 * value '1'. 1716 * A return value of '0' indicates no measurable change 1717 * A return value of '-1' means that the attributes in @inode are 1718 * more recent. 1719 */ 1720 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr, 1721 const struct inode *inode) 1722 { 1723 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode); 1724 if (diff > 0) 1725 return 1; 1726 return diff == 0 ? 0 : -1; 1727 } 1728 1729 /** 1730 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes 1731 * @fattr: attributes 1732 * @inode: pointer to inode 1733 * 1734 * Attempt to divine whether or not an RPC call reply carrying stale 1735 * attributes got scheduled after another call carrying updated ones. 1736 * 1737 * We assume that the server observes strictly monotonic semantics for 1738 * the change attribute, so a larger value means that the attributes in 1739 * @fattr are more recent, in which case the function returns the 1740 * value '1'. 1741 * A return value of '-1' means that the attributes in @inode are 1742 * more recent or unchanged. 1743 */ 1744 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr, 1745 const struct inode *inode) 1746 { 1747 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1; 1748 } 1749 1750 /** 1751 * nfs_inode_attrs_cmp - compare attributes 1752 * @fattr: attributes 1753 * @inode: pointer to inode 1754 * 1755 * This function returns '1' if it thinks the attributes in @fattr are 1756 * more recent than the ones cached in @inode. It returns '-1' if 1757 * the attributes in @inode are more recent than the ones in @fattr, 1758 * and it returns 0 if not sure. 1759 */ 1760 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr, 1761 const struct inode *inode) 1762 { 1763 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0) 1764 return 1; 1765 switch (NFS_SERVER(inode)->change_attr_type) { 1766 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1767 break; 1768 case NFS4_CHANGE_TYPE_IS_TIME_METADATA: 1769 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1770 break; 1771 return nfs_inode_attrs_cmp_monotonic(fattr, inode); 1772 default: 1773 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) 1774 break; 1775 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode); 1776 } 1777 return 0; 1778 } 1779 1780 /** 1781 * nfs_inode_finish_partial_attr_update - complete a previous inode update 1782 * @fattr: attributes 1783 * @inode: pointer to inode 1784 * 1785 * Returns '1' if the last attribute update left the inode cached 1786 * attributes in a partially unrevalidated state, and @fattr 1787 * matches the change attribute of that partial update. 1788 * Otherwise returns '0'. 1789 */ 1790 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr, 1791 const struct inode *inode) 1792 { 1793 const unsigned long check_valid = 1794 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME | 1795 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 1796 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER | 1797 NFS_INO_INVALID_NLINK; 1798 unsigned long cache_validity = NFS_I(inode)->cache_validity; 1799 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type; 1800 1801 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED && 1802 !(cache_validity & NFS_INO_INVALID_CHANGE) && 1803 (cache_validity & check_valid) != 0 && 1804 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1805 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0) 1806 return 1; 1807 return 0; 1808 } 1809 1810 static int nfs_refresh_inode_locked(struct inode *inode, 1811 struct nfs_fattr *fattr) 1812 { 1813 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 1814 int ret = 0; 1815 1816 trace_nfs_refresh_inode_enter(inode); 1817 1818 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode)) 1819 ret = nfs_update_inode(inode, fattr); 1820 else if (attr_cmp == 0) 1821 ret = nfs_check_inode_attributes(inode, fattr); 1822 1823 trace_nfs_refresh_inode_exit(inode, ret); 1824 return ret; 1825 } 1826 1827 /** 1828 * nfs_refresh_inode - try to update the inode attribute cache 1829 * @inode: pointer to inode 1830 * @fattr: updated attributes 1831 * 1832 * Check that an RPC call that returned attributes has not overlapped with 1833 * other recent updates of the inode metadata, then decide whether it is 1834 * safe to do a full update of the inode attributes, or whether just to 1835 * call nfs_check_inode_attributes. 1836 */ 1837 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1838 { 1839 int status; 1840 1841 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1842 return 0; 1843 spin_lock(&inode->i_lock); 1844 status = nfs_refresh_inode_locked(inode, fattr); 1845 spin_unlock(&inode->i_lock); 1846 1847 return status; 1848 } 1849 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1850 1851 static int nfs_post_op_update_inode_locked(struct inode *inode, 1852 struct nfs_fattr *fattr, unsigned int invalid) 1853 { 1854 if (S_ISDIR(inode->i_mode)) 1855 invalid |= NFS_INO_INVALID_DATA; 1856 nfs_set_cache_invalid(inode, invalid); 1857 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1858 return 0; 1859 return nfs_refresh_inode_locked(inode, fattr); 1860 } 1861 1862 /** 1863 * nfs_post_op_update_inode - try to update the inode attribute cache 1864 * @inode: pointer to inode 1865 * @fattr: updated attributes 1866 * 1867 * After an operation that has changed the inode metadata, mark the 1868 * attribute cache as being invalid, then try to update it. 1869 * 1870 * NB: if the server didn't return any post op attributes, this 1871 * function will force the retrieval of attributes before the next 1872 * NFS request. Thus it should be used only for operations that 1873 * are expected to change one or more attributes, to avoid 1874 * unnecessary NFS requests and trips through nfs_update_inode(). 1875 */ 1876 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1877 { 1878 int status; 1879 1880 spin_lock(&inode->i_lock); 1881 nfs_fattr_set_barrier(fattr); 1882 status = nfs_post_op_update_inode_locked(inode, fattr, 1883 NFS_INO_INVALID_CHANGE 1884 | NFS_INO_INVALID_CTIME 1885 | NFS_INO_REVAL_FORCED); 1886 spin_unlock(&inode->i_lock); 1887 1888 return status; 1889 } 1890 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1891 1892 /** 1893 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1894 * @inode: pointer to inode 1895 * @fattr: updated attributes 1896 * 1897 * After an operation that has changed the inode metadata, mark the 1898 * attribute cache as being invalid, then try to update it. Fake up 1899 * weak cache consistency data, if none exist. 1900 * 1901 * This function is mainly designed to be used by the ->write_done() functions. 1902 */ 1903 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1904 { 1905 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); 1906 int status; 1907 1908 /* Don't do a WCC update if these attributes are already stale */ 1909 if (attr_cmp < 0) 1910 return 0; 1911 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) { 1912 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1913 | NFS_ATTR_FATTR_PRESIZE 1914 | NFS_ATTR_FATTR_PREMTIME 1915 | NFS_ATTR_FATTR_PRECTIME); 1916 goto out_noforce; 1917 } 1918 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1919 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1920 fattr->pre_change_attr = inode_peek_iversion_raw(inode); 1921 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1922 } 1923 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1924 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1925 fattr->pre_ctime = inode->i_ctime; 1926 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1927 } 1928 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1929 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1930 fattr->pre_mtime = inode->i_mtime; 1931 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1932 } 1933 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1934 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1935 fattr->pre_size = i_size_read(inode); 1936 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1937 } 1938 out_noforce: 1939 status = nfs_post_op_update_inode_locked(inode, fattr, 1940 NFS_INO_INVALID_CHANGE 1941 | NFS_INO_INVALID_CTIME 1942 | NFS_INO_INVALID_MTIME 1943 | NFS_INO_INVALID_BLOCKS); 1944 return status; 1945 } 1946 1947 /** 1948 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1949 * @inode: pointer to inode 1950 * @fattr: updated attributes 1951 * 1952 * After an operation that has changed the inode metadata, mark the 1953 * attribute cache as being invalid, then try to update it. Fake up 1954 * weak cache consistency data, if none exist. 1955 * 1956 * This function is mainly designed to be used by the ->write_done() functions. 1957 */ 1958 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1959 { 1960 int status; 1961 1962 spin_lock(&inode->i_lock); 1963 nfs_fattr_set_barrier(fattr); 1964 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1965 spin_unlock(&inode->i_lock); 1966 return status; 1967 } 1968 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1969 1970 1971 /* 1972 * Many nfs protocol calls return the new file attributes after 1973 * an operation. Here we update the inode to reflect the state 1974 * of the server's inode. 1975 * 1976 * This is a bit tricky because we have to make sure all dirty pages 1977 * have been sent off to the server before calling invalidate_inode_pages. 1978 * To make sure no other process adds more write requests while we try 1979 * our best to flush them, we make them sleep during the attribute refresh. 1980 * 1981 * A very similar scenario holds for the dir cache. 1982 */ 1983 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1984 { 1985 struct nfs_server *server = NFS_SERVER(inode); 1986 struct nfs_inode *nfsi = NFS_I(inode); 1987 loff_t cur_isize, new_isize; 1988 u64 fattr_supported = server->fattr_valid; 1989 unsigned long invalid = 0; 1990 unsigned long now = jiffies; 1991 unsigned long save_cache_validity; 1992 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1993 bool cache_revalidated = true; 1994 bool attr_changed = false; 1995 bool have_delegation; 1996 1997 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1998 __func__, inode->i_sb->s_id, inode->i_ino, 1999 nfs_display_fhandle_hash(NFS_FH(inode)), 2000 atomic_read(&inode->i_count), fattr->valid); 2001 2002 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { 2003 /* Only a mounted-on-fileid? Just exit */ 2004 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 2005 return 0; 2006 /* Has the inode gone and changed behind our back? */ 2007 } else if (nfsi->fileid != fattr->fileid) { 2008 /* Is this perhaps the mounted-on fileid? */ 2009 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 2010 nfsi->fileid == fattr->mounted_on_fileid) 2011 return 0; 2012 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 2013 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 2014 NFS_SERVER(inode)->nfs_client->cl_hostname, 2015 inode->i_sb->s_id, (long long)nfsi->fileid, 2016 (long long)fattr->fileid); 2017 goto out_err; 2018 } 2019 2020 /* 2021 * Make sure the inode's type hasn't changed. 2022 */ 2023 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) { 2024 /* 2025 * Big trouble! The inode has become a different object. 2026 */ 2027 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 2028 __func__, inode->i_ino, inode->i_mode, fattr->mode); 2029 goto out_err; 2030 } 2031 2032 /* Update the fsid? */ 2033 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 2034 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 2035 !IS_AUTOMOUNT(inode)) 2036 server->fsid = fattr->fsid; 2037 2038 /* Save the delegation state before clearing cache_validity */ 2039 have_delegation = nfs_have_delegated_attributes(inode); 2040 2041 /* 2042 * Update the read time so we don't revalidate too often. 2043 */ 2044 nfsi->read_cache_jiffies = fattr->time_start; 2045 2046 save_cache_validity = nfsi->cache_validity; 2047 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 2048 | NFS_INO_INVALID_ATIME 2049 | NFS_INO_REVAL_FORCED 2050 | NFS_INO_INVALID_BLOCKS); 2051 2052 /* Do atomic weak cache consistency updates */ 2053 nfs_wcc_update_inode(inode, fattr); 2054 2055 if (pnfs_layoutcommit_outstanding(inode)) { 2056 nfsi->cache_validity |= 2057 save_cache_validity & 2058 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 2059 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | 2060 NFS_INO_INVALID_BLOCKS); 2061 cache_revalidated = false; 2062 } 2063 2064 /* More cache consistency checks */ 2065 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 2066 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { 2067 /* Could it be a race with writeback? */ 2068 if (!(have_writers || have_delegation)) { 2069 invalid |= NFS_INO_INVALID_DATA 2070 | NFS_INO_INVALID_ACCESS 2071 | NFS_INO_INVALID_ACL 2072 | NFS_INO_INVALID_XATTR; 2073 /* Force revalidate of all attributes */ 2074 save_cache_validity |= NFS_INO_INVALID_CTIME 2075 | NFS_INO_INVALID_MTIME 2076 | NFS_INO_INVALID_SIZE 2077 | NFS_INO_INVALID_BLOCKS 2078 | NFS_INO_INVALID_NLINK 2079 | NFS_INO_INVALID_MODE 2080 | NFS_INO_INVALID_OTHER; 2081 if (S_ISDIR(inode->i_mode)) 2082 nfs_force_lookup_revalidate(inode); 2083 attr_changed = true; 2084 dprintk("NFS: change_attr change on server for file %s/%ld\n", 2085 inode->i_sb->s_id, 2086 inode->i_ino); 2087 } else if (!have_delegation) 2088 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 2089 inode_set_iversion_raw(inode, fattr->change_attr); 2090 } 2091 } else { 2092 nfsi->cache_validity |= 2093 save_cache_validity & NFS_INO_INVALID_CHANGE; 2094 if (!have_delegation || 2095 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0) 2096 cache_revalidated = false; 2097 } 2098 2099 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 2100 inode->i_mtime = fattr->mtime; 2101 else if (fattr_supported & NFS_ATTR_FATTR_MTIME) 2102 nfsi->cache_validity |= 2103 save_cache_validity & NFS_INO_INVALID_MTIME; 2104 2105 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 2106 inode->i_ctime = fattr->ctime; 2107 else if (fattr_supported & NFS_ATTR_FATTR_CTIME) 2108 nfsi->cache_validity |= 2109 save_cache_validity & NFS_INO_INVALID_CTIME; 2110 2111 /* Check if our cached file size is stale */ 2112 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 2113 new_isize = nfs_size_to_loff_t(fattr->size); 2114 cur_isize = i_size_read(inode); 2115 if (new_isize != cur_isize && !have_delegation) { 2116 /* Do we perhaps have any outstanding writes, or has 2117 * the file grown beyond our last write? */ 2118 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 2119 trace_nfs_size_update(inode, new_isize); 2120 i_size_write(inode, new_isize); 2121 if (!have_writers) 2122 invalid |= NFS_INO_INVALID_DATA; 2123 } 2124 } 2125 if (new_isize == 0 && 2126 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED | 2127 NFS_ATTR_FATTR_BLOCKS_USED))) { 2128 fattr->du.nfs3.used = 0; 2129 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED; 2130 } 2131 } else 2132 nfsi->cache_validity |= 2133 save_cache_validity & NFS_INO_INVALID_SIZE; 2134 2135 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 2136 inode->i_atime = fattr->atime; 2137 else if (fattr_supported & NFS_ATTR_FATTR_ATIME) 2138 nfsi->cache_validity |= 2139 save_cache_validity & NFS_INO_INVALID_ATIME; 2140 2141 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 2142 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 2143 umode_t newmode = inode->i_mode & S_IFMT; 2144 newmode |= fattr->mode & S_IALLUGO; 2145 inode->i_mode = newmode; 2146 invalid |= NFS_INO_INVALID_ACCESS 2147 | NFS_INO_INVALID_ACL; 2148 } 2149 } else if (fattr_supported & NFS_ATTR_FATTR_MODE) 2150 nfsi->cache_validity |= 2151 save_cache_validity & NFS_INO_INVALID_MODE; 2152 2153 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 2154 if (!uid_eq(inode->i_uid, fattr->uid)) { 2155 invalid |= NFS_INO_INVALID_ACCESS 2156 | NFS_INO_INVALID_ACL; 2157 inode->i_uid = fattr->uid; 2158 } 2159 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER) 2160 nfsi->cache_validity |= 2161 save_cache_validity & NFS_INO_INVALID_OTHER; 2162 2163 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 2164 if (!gid_eq(inode->i_gid, fattr->gid)) { 2165 invalid |= NFS_INO_INVALID_ACCESS 2166 | NFS_INO_INVALID_ACL; 2167 inode->i_gid = fattr->gid; 2168 } 2169 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP) 2170 nfsi->cache_validity |= 2171 save_cache_validity & NFS_INO_INVALID_OTHER; 2172 2173 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 2174 if (inode->i_nlink != fattr->nlink) 2175 set_nlink(inode, fattr->nlink); 2176 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK) 2177 nfsi->cache_validity |= 2178 save_cache_validity & NFS_INO_INVALID_NLINK; 2179 2180 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 2181 /* 2182 * report the blocks in 512byte units 2183 */ 2184 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 2185 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED) 2186 nfsi->cache_validity |= 2187 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2188 2189 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 2190 inode->i_blocks = fattr->du.nfs2.blocks; 2191 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED) 2192 nfsi->cache_validity |= 2193 save_cache_validity & NFS_INO_INVALID_BLOCKS; 2194 2195 /* Update attrtimeo value if we're out of the unstable period */ 2196 if (attr_changed) { 2197 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 2198 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 2199 nfsi->attrtimeo_timestamp = now; 2200 /* Set barrier to be more recent than all outstanding updates */ 2201 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 2202 } else { 2203 if (cache_revalidated) { 2204 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 2205 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 2206 nfsi->attrtimeo <<= 1; 2207 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 2208 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 2209 } 2210 nfsi->attrtimeo_timestamp = now; 2211 } 2212 /* Set the barrier to be more recent than this fattr */ 2213 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) 2214 nfsi->attr_gencount = fattr->gencount; 2215 } 2216 2217 /* Don't invalidate the data if we were to blame */ 2218 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 2219 || S_ISLNK(inode->i_mode))) 2220 invalid &= ~NFS_INO_INVALID_DATA; 2221 nfs_set_cache_invalid(inode, invalid); 2222 2223 return 0; 2224 out_err: 2225 /* 2226 * No need to worry about unhashing the dentry, as the 2227 * lookup validation will know that the inode is bad. 2228 * (But we fall through to invalidate the caches.) 2229 */ 2230 nfs_set_inode_stale_locked(inode); 2231 return -ESTALE; 2232 } 2233 2234 struct inode *nfs_alloc_inode(struct super_block *sb) 2235 { 2236 struct nfs_inode *nfsi; 2237 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL); 2238 if (!nfsi) 2239 return NULL; 2240 nfsi->flags = 0UL; 2241 nfsi->cache_validity = 0UL; 2242 #if IS_ENABLED(CONFIG_NFS_V4) 2243 nfsi->nfs4_acl = NULL; 2244 #endif /* CONFIG_NFS_V4 */ 2245 #ifdef CONFIG_NFS_V4_2 2246 nfsi->xattr_cache = NULL; 2247 #endif 2248 return &nfsi->vfs_inode; 2249 } 2250 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 2251 2252 void nfs_free_inode(struct inode *inode) 2253 { 2254 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 2255 } 2256 EXPORT_SYMBOL_GPL(nfs_free_inode); 2257 2258 static inline void nfs4_init_once(struct nfs_inode *nfsi) 2259 { 2260 #if IS_ENABLED(CONFIG_NFS_V4) 2261 INIT_LIST_HEAD(&nfsi->open_states); 2262 nfsi->delegation = NULL; 2263 init_rwsem(&nfsi->rwsem); 2264 nfsi->layout = NULL; 2265 #endif 2266 } 2267 2268 static void init_once(void *foo) 2269 { 2270 struct nfs_inode *nfsi = foo; 2271 2272 inode_init_once(&nfsi->vfs_inode); 2273 INIT_LIST_HEAD(&nfsi->open_files); 2274 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2275 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2276 nfs4_init_once(nfsi); 2277 } 2278 2279 static int __init nfs_init_inodecache(void) 2280 { 2281 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2282 sizeof(struct nfs_inode), 2283 0, (SLAB_RECLAIM_ACCOUNT| 2284 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 2285 init_once); 2286 if (nfs_inode_cachep == NULL) 2287 return -ENOMEM; 2288 2289 return 0; 2290 } 2291 2292 static void nfs_destroy_inodecache(void) 2293 { 2294 /* 2295 * Make sure all delayed rcu free inodes are flushed before we 2296 * destroy cache. 2297 */ 2298 rcu_barrier(); 2299 kmem_cache_destroy(nfs_inode_cachep); 2300 } 2301 2302 struct workqueue_struct *nfsiod_workqueue; 2303 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2304 2305 /* 2306 * start up the nfsiod workqueue 2307 */ 2308 static int nfsiod_start(void) 2309 { 2310 struct workqueue_struct *wq; 2311 dprintk("RPC: creating workqueue nfsiod\n"); 2312 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); 2313 if (wq == NULL) 2314 return -ENOMEM; 2315 nfsiod_workqueue = wq; 2316 return 0; 2317 } 2318 2319 /* 2320 * Destroy the nfsiod workqueue 2321 */ 2322 static void nfsiod_stop(void) 2323 { 2324 struct workqueue_struct *wq; 2325 2326 wq = nfsiod_workqueue; 2327 if (wq == NULL) 2328 return; 2329 nfsiod_workqueue = NULL; 2330 destroy_workqueue(wq); 2331 } 2332 2333 unsigned int nfs_net_id; 2334 EXPORT_SYMBOL_GPL(nfs_net_id); 2335 2336 static int nfs_net_init(struct net *net) 2337 { 2338 nfs_clients_init(net); 2339 return nfs_fs_proc_net_init(net); 2340 } 2341 2342 static void nfs_net_exit(struct net *net) 2343 { 2344 nfs_fs_proc_net_exit(net); 2345 nfs_clients_exit(net); 2346 } 2347 2348 static struct pernet_operations nfs_net_ops = { 2349 .init = nfs_net_init, 2350 .exit = nfs_net_exit, 2351 .id = &nfs_net_id, 2352 .size = sizeof(struct nfs_net), 2353 }; 2354 2355 /* 2356 * Initialize NFS 2357 */ 2358 static int __init init_nfs_fs(void) 2359 { 2360 int err; 2361 2362 err = nfs_sysfs_init(); 2363 if (err < 0) 2364 goto out10; 2365 2366 err = register_pernet_subsys(&nfs_net_ops); 2367 if (err < 0) 2368 goto out9; 2369 2370 err = nfsiod_start(); 2371 if (err) 2372 goto out7; 2373 2374 err = nfs_fs_proc_init(); 2375 if (err) 2376 goto out6; 2377 2378 err = nfs_init_nfspagecache(); 2379 if (err) 2380 goto out5; 2381 2382 err = nfs_init_inodecache(); 2383 if (err) 2384 goto out4; 2385 2386 err = nfs_init_readpagecache(); 2387 if (err) 2388 goto out3; 2389 2390 err = nfs_init_writepagecache(); 2391 if (err) 2392 goto out2; 2393 2394 err = nfs_init_directcache(); 2395 if (err) 2396 goto out1; 2397 2398 rpc_proc_register(&init_net, &nfs_rpcstat); 2399 2400 err = register_nfs_fs(); 2401 if (err) 2402 goto out0; 2403 2404 return 0; 2405 out0: 2406 rpc_proc_unregister(&init_net, "nfs"); 2407 nfs_destroy_directcache(); 2408 out1: 2409 nfs_destroy_writepagecache(); 2410 out2: 2411 nfs_destroy_readpagecache(); 2412 out3: 2413 nfs_destroy_inodecache(); 2414 out4: 2415 nfs_destroy_nfspagecache(); 2416 out5: 2417 nfs_fs_proc_exit(); 2418 out6: 2419 nfsiod_stop(); 2420 out7: 2421 unregister_pernet_subsys(&nfs_net_ops); 2422 out9: 2423 nfs_sysfs_exit(); 2424 out10: 2425 return err; 2426 } 2427 2428 static void __exit exit_nfs_fs(void) 2429 { 2430 nfs_destroy_directcache(); 2431 nfs_destroy_writepagecache(); 2432 nfs_destroy_readpagecache(); 2433 nfs_destroy_inodecache(); 2434 nfs_destroy_nfspagecache(); 2435 unregister_pernet_subsys(&nfs_net_ops); 2436 rpc_proc_unregister(&init_net, "nfs"); 2437 unregister_nfs_fs(); 2438 nfs_fs_proc_exit(); 2439 nfsiod_stop(); 2440 nfs_sysfs_exit(); 2441 } 2442 2443 /* Not quite true; I just maintain it */ 2444 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2445 MODULE_LICENSE("GPL"); 2446 module_param(enable_ino64, bool, 0644); 2447 2448 module_init(init_nfs_fs) 2449 module_exit(exit_nfs_fs) 2450