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