1 /* 2 * linux/fs/nfs/inode.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs inode and superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/sched/signal.h> 19 #include <linux/time.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/string.h> 23 #include <linux/stat.h> 24 #include <linux/errno.h> 25 #include <linux/unistd.h> 26 #include <linux/sunrpc/clnt.h> 27 #include <linux/sunrpc/stats.h> 28 #include <linux/sunrpc/metrics.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/slab.h> 39 #include <linux/compat.h> 40 #include <linux/freezer.h> 41 #include <linux/uaccess.h> 42 #include <linux/iversion.h> 43 44 #include "nfs4_fs.h" 45 #include "callback.h" 46 #include "delegation.h" 47 #include "iostat.h" 48 #include "internal.h" 49 #include "fscache.h" 50 #include "pnfs.h" 51 #include "nfs.h" 52 #include "netns.h" 53 54 #include "nfstrace.h" 55 56 #define NFSDBG_FACILITY NFSDBG_VFS 57 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 59 60 /* Default is to see 64-bit inode numbers */ 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 62 63 static void nfs_invalidate_inode(struct inode *); 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 65 66 static struct kmem_cache * nfs_inode_cachep; 67 68 static inline unsigned long 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 70 { 71 return nfs_fileid_to_ino_t(fattr->fileid); 72 } 73 74 static int nfs_wait_killable(int mode) 75 { 76 freezable_schedule_unsafe(); 77 if (signal_pending_state(mode, current)) 78 return -ERESTARTSYS; 79 return 0; 80 } 81 82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 83 { 84 return nfs_wait_killable(mode); 85 } 86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 87 88 /** 89 * nfs_compat_user_ino64 - returns the user-visible inode number 90 * @fileid: 64-bit fileid 91 * 92 * This function returns a 32-bit inode number if the boot parameter 93 * nfs.enable_ino64 is zero. 94 */ 95 u64 nfs_compat_user_ino64(u64 fileid) 96 { 97 #ifdef CONFIG_COMPAT 98 compat_ulong_t ino; 99 #else 100 unsigned long ino; 101 #endif 102 103 if (enable_ino64) 104 return fileid; 105 ino = fileid; 106 if (sizeof(ino) < sizeof(fileid)) 107 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 108 return ino; 109 } 110 111 int nfs_drop_inode(struct inode *inode) 112 { 113 return NFS_STALE(inode) || generic_drop_inode(inode); 114 } 115 EXPORT_SYMBOL_GPL(nfs_drop_inode); 116 117 void nfs_clear_inode(struct inode *inode) 118 { 119 /* 120 * The following should never happen... 121 */ 122 WARN_ON_ONCE(nfs_have_writebacks(inode)); 123 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 124 nfs_zap_acl_cache(inode); 125 nfs_access_zap_cache(inode); 126 nfs_fscache_clear_inode(inode); 127 } 128 EXPORT_SYMBOL_GPL(nfs_clear_inode); 129 130 void nfs_evict_inode(struct inode *inode) 131 { 132 truncate_inode_pages_final(&inode->i_data); 133 clear_inode(inode); 134 nfs_clear_inode(inode); 135 } 136 137 int nfs_sync_inode(struct inode *inode) 138 { 139 inode_dio_wait(inode); 140 return nfs_wb_all(inode); 141 } 142 EXPORT_SYMBOL_GPL(nfs_sync_inode); 143 144 /** 145 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 146 * @mapping: pointer to struct address_space 147 */ 148 int nfs_sync_mapping(struct address_space *mapping) 149 { 150 int ret = 0; 151 152 if (mapping->nrpages != 0) { 153 unmap_mapping_range(mapping, 0, 0, 0); 154 ret = nfs_wb_all(mapping->host); 155 } 156 return ret; 157 } 158 159 static int nfs_attribute_timeout(struct inode *inode) 160 { 161 struct nfs_inode *nfsi = NFS_I(inode); 162 163 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 164 } 165 166 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags) 167 { 168 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 169 170 /* Special case for the pagecache or access cache */ 171 if (flags == NFS_INO_REVAL_PAGECACHE && 172 !(cache_validity & NFS_INO_REVAL_FORCED)) 173 return false; 174 return (cache_validity & flags) != 0; 175 } 176 177 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags) 178 { 179 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 180 181 if ((cache_validity & flags) != 0) 182 return true; 183 if (nfs_attribute_timeout(inode)) 184 return true; 185 return false; 186 } 187 188 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) 189 { 190 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 191 return nfs_check_cache_invalid_delegated(inode, flags); 192 193 return nfs_check_cache_invalid_not_delegated(inode, flags); 194 } 195 196 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 197 { 198 struct nfs_inode *nfsi = NFS_I(inode); 199 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ); 200 201 if (have_delegation) { 202 if (!(flags & NFS_INO_REVAL_FORCED)) 203 flags &= ~NFS_INO_INVALID_OTHER; 204 flags &= ~(NFS_INO_INVALID_CHANGE 205 | NFS_INO_INVALID_SIZE 206 | NFS_INO_REVAL_PAGECACHE); 207 } 208 209 if (inode->i_mapping->nrpages == 0) 210 flags &= ~NFS_INO_INVALID_DATA; 211 nfsi->cache_validity |= flags; 212 if (flags & NFS_INO_INVALID_DATA) 213 nfs_fscache_invalidate(inode); 214 } 215 216 /* 217 * Invalidate the local caches 218 */ 219 static void nfs_zap_caches_locked(struct inode *inode) 220 { 221 struct nfs_inode *nfsi = NFS_I(inode); 222 int mode = inode->i_mode; 223 224 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 225 226 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 227 nfsi->attrtimeo_timestamp = jiffies; 228 229 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); 230 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 231 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 232 | NFS_INO_INVALID_DATA 233 | NFS_INO_INVALID_ACCESS 234 | NFS_INO_INVALID_ACL 235 | NFS_INO_REVAL_PAGECACHE); 236 } else 237 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 238 | NFS_INO_INVALID_ACCESS 239 | NFS_INO_INVALID_ACL 240 | NFS_INO_REVAL_PAGECACHE); 241 nfs_zap_label_cache_locked(nfsi); 242 } 243 244 void nfs_zap_caches(struct inode *inode) 245 { 246 spin_lock(&inode->i_lock); 247 nfs_zap_caches_locked(inode); 248 spin_unlock(&inode->i_lock); 249 } 250 251 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 252 { 253 if (mapping->nrpages != 0) { 254 spin_lock(&inode->i_lock); 255 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 256 spin_unlock(&inode->i_lock); 257 } 258 } 259 260 void nfs_zap_acl_cache(struct inode *inode) 261 { 262 void (*clear_acl_cache)(struct inode *); 263 264 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 265 if (clear_acl_cache != NULL) 266 clear_acl_cache(inode); 267 spin_lock(&inode->i_lock); 268 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 269 spin_unlock(&inode->i_lock); 270 } 271 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 272 273 void nfs_invalidate_atime(struct inode *inode) 274 { 275 spin_lock(&inode->i_lock); 276 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 277 spin_unlock(&inode->i_lock); 278 } 279 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 280 281 /* 282 * Invalidate, but do not unhash, the inode. 283 * NB: must be called with inode->i_lock held! 284 */ 285 static void nfs_invalidate_inode(struct inode *inode) 286 { 287 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 288 nfs_zap_caches_locked(inode); 289 } 290 291 struct nfs_find_desc { 292 struct nfs_fh *fh; 293 struct nfs_fattr *fattr; 294 }; 295 296 /* 297 * In NFSv3 we can have 64bit inode numbers. In order to support 298 * this, and re-exported directories (also seen in NFSv2) 299 * we are forced to allow 2 different inodes to have the same 300 * i_ino. 301 */ 302 static int 303 nfs_find_actor(struct inode *inode, void *opaque) 304 { 305 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 306 struct nfs_fh *fh = desc->fh; 307 struct nfs_fattr *fattr = desc->fattr; 308 309 if (NFS_FILEID(inode) != fattr->fileid) 310 return 0; 311 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 312 return 0; 313 if (nfs_compare_fh(NFS_FH(inode), fh)) 314 return 0; 315 if (is_bad_inode(inode) || NFS_STALE(inode)) 316 return 0; 317 return 1; 318 } 319 320 static int 321 nfs_init_locked(struct inode *inode, void *opaque) 322 { 323 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 324 struct nfs_fattr *fattr = desc->fattr; 325 326 set_nfs_fileid(inode, fattr->fileid); 327 inode->i_mode = fattr->mode; 328 nfs_copy_fh(NFS_FH(inode), desc->fh); 329 return 0; 330 } 331 332 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 333 static void nfs_clear_label_invalid(struct inode *inode) 334 { 335 spin_lock(&inode->i_lock); 336 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 337 spin_unlock(&inode->i_lock); 338 } 339 340 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 341 struct nfs4_label *label) 342 { 343 int error; 344 345 if (label == NULL) 346 return; 347 348 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 349 error = security_inode_notifysecctx(inode, label->label, 350 label->len); 351 if (error) 352 printk(KERN_ERR "%s() %s %d " 353 "security_inode_notifysecctx() %d\n", 354 __func__, 355 (char *)label->label, 356 label->len, error); 357 nfs_clear_label_invalid(inode); 358 } 359 } 360 361 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 362 { 363 struct nfs4_label *label = NULL; 364 int minor_version = server->nfs_client->cl_minorversion; 365 366 if (minor_version < 2) 367 return label; 368 369 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 370 return label; 371 372 label = kzalloc(sizeof(struct nfs4_label), flags); 373 if (label == NULL) 374 return ERR_PTR(-ENOMEM); 375 376 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 377 if (label->label == NULL) { 378 kfree(label); 379 return ERR_PTR(-ENOMEM); 380 } 381 label->len = NFS4_MAXLABELLEN; 382 383 return label; 384 } 385 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 386 #else 387 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 388 struct nfs4_label *label) 389 { 390 } 391 #endif 392 EXPORT_SYMBOL_GPL(nfs_setsecurity); 393 394 /* Search for inode identified by fh, fileid and i_mode in inode cache. */ 395 struct inode * 396 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) 397 { 398 struct nfs_find_desc desc = { 399 .fh = fh, 400 .fattr = fattr, 401 }; 402 struct inode *inode; 403 unsigned long hash; 404 405 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || 406 !(fattr->valid & NFS_ATTR_FATTR_TYPE)) 407 return NULL; 408 409 hash = nfs_fattr_to_ino_t(fattr); 410 inode = ilookup5(sb, hash, nfs_find_actor, &desc); 411 412 dprintk("%s: returning %p\n", __func__, inode); 413 return inode; 414 } 415 416 /* 417 * This is our front-end to iget that looks up inodes by file handle 418 * instead of inode number. 419 */ 420 struct inode * 421 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label) 422 { 423 struct nfs_find_desc desc = { 424 .fh = fh, 425 .fattr = fattr 426 }; 427 struct inode *inode = ERR_PTR(-ENOENT); 428 unsigned long hash; 429 430 nfs_attr_check_mountpoint(sb, fattr); 431 432 if (nfs_attr_use_mounted_on_fileid(fattr)) 433 fattr->fileid = fattr->mounted_on_fileid; 434 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 435 goto out_no_inode; 436 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 437 goto out_no_inode; 438 439 hash = nfs_fattr_to_ino_t(fattr); 440 441 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 442 if (inode == NULL) { 443 inode = ERR_PTR(-ENOMEM); 444 goto out_no_inode; 445 } 446 447 if (inode->i_state & I_NEW) { 448 struct nfs_inode *nfsi = NFS_I(inode); 449 unsigned long now = jiffies; 450 451 /* We set i_ino for the few things that still rely on it, 452 * such as stat(2) */ 453 inode->i_ino = hash; 454 455 /* We can't support update_atime(), since the server will reset it */ 456 inode->i_flags |= S_NOATIME|S_NOCMTIME; 457 inode->i_mode = fattr->mode; 458 nfsi->cache_validity = 0; 459 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 460 && nfs_server_capable(inode, NFS_CAP_MODE)) 461 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 462 /* Why so? Because we want revalidate for devices/FIFOs, and 463 * that's precisely what we have in nfs_file_inode_operations. 464 */ 465 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 466 if (S_ISREG(inode->i_mode)) { 467 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 468 inode->i_data.a_ops = &nfs_file_aops; 469 } else if (S_ISDIR(inode->i_mode)) { 470 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 471 inode->i_fop = &nfs_dir_operations; 472 inode->i_data.a_ops = &nfs_dir_aops; 473 /* Deal with crossing mountpoints */ 474 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 475 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 476 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 477 inode->i_op = &nfs_referral_inode_operations; 478 else 479 inode->i_op = &nfs_mountpoint_inode_operations; 480 inode->i_fop = NULL; 481 inode->i_flags |= S_AUTOMOUNT; 482 } 483 } else if (S_ISLNK(inode->i_mode)) { 484 inode->i_op = &nfs_symlink_inode_operations; 485 inode_nohighmem(inode); 486 } else 487 init_special_inode(inode, inode->i_mode, fattr->rdev); 488 489 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 490 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 491 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 492 inode_set_iversion_raw(inode, 0); 493 inode->i_size = 0; 494 clear_nlink(inode); 495 inode->i_uid = make_kuid(&init_user_ns, -2); 496 inode->i_gid = make_kgid(&init_user_ns, -2); 497 inode->i_blocks = 0; 498 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 499 nfsi->write_io = 0; 500 nfsi->read_io = 0; 501 502 nfsi->read_cache_jiffies = fattr->time_start; 503 nfsi->attr_gencount = fattr->gencount; 504 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 505 inode->i_atime = timespec_to_timespec64(fattr->atime); 506 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 507 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 508 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 509 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 510 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 511 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 512 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 513 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 514 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 515 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); 516 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 517 inode_set_iversion_raw(inode, fattr->change_attr); 518 else 519 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); 520 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 521 inode->i_size = nfs_size_to_loff_t(fattr->size); 522 else 523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); 524 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 525 set_nlink(inode, fattr->nlink); 526 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 528 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 529 inode->i_uid = fattr->uid; 530 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 532 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 533 inode->i_gid = fattr->gid; 534 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 536 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 537 inode->i_blocks = fattr->du.nfs2.blocks; 538 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 539 /* 540 * report the blocks in 512byte units 541 */ 542 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 543 } 544 545 if (nfsi->cache_validity != 0) 546 nfsi->cache_validity |= NFS_INO_REVAL_FORCED; 547 548 nfs_setsecurity(inode, fattr, label); 549 550 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 551 nfsi->attrtimeo_timestamp = now; 552 nfsi->access_cache = RB_ROOT; 553 554 nfs_fscache_init_inode(inode); 555 556 unlock_new_inode(inode); 557 } else { 558 int err = nfs_refresh_inode(inode, fattr); 559 if (err < 0) { 560 iput(inode); 561 inode = ERR_PTR(err); 562 goto out_no_inode; 563 } 564 } 565 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 566 inode->i_sb->s_id, 567 (unsigned long long)NFS_FILEID(inode), 568 nfs_display_fhandle_hash(fh), 569 atomic_read(&inode->i_count)); 570 571 out: 572 return inode; 573 574 out_no_inode: 575 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 576 goto out; 577 } 578 EXPORT_SYMBOL_GPL(nfs_fhget); 579 580 #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) 581 582 int 583 nfs_setattr(struct dentry *dentry, struct iattr *attr) 584 { 585 struct inode *inode = d_inode(dentry); 586 struct nfs_fattr *fattr; 587 int error = 0; 588 589 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 590 591 /* skip mode change if it's just for clearing setuid/setgid */ 592 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 593 attr->ia_valid &= ~ATTR_MODE; 594 595 if (attr->ia_valid & ATTR_SIZE) { 596 BUG_ON(!S_ISREG(inode->i_mode)); 597 598 error = inode_newsize_ok(inode, attr->ia_size); 599 if (error) 600 return error; 601 602 if (attr->ia_size == i_size_read(inode)) 603 attr->ia_valid &= ~ATTR_SIZE; 604 } 605 606 /* Optimization: if the end result is no change, don't RPC */ 607 attr->ia_valid &= NFS_VALID_ATTRS; 608 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 609 return 0; 610 611 trace_nfs_setattr_enter(inode); 612 613 /* Write all dirty data */ 614 if (S_ISREG(inode->i_mode)) 615 nfs_sync_inode(inode); 616 617 fattr = nfs_alloc_fattr(); 618 if (fattr == NULL) { 619 error = -ENOMEM; 620 goto out; 621 } 622 623 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 624 if (error == 0) 625 error = nfs_refresh_inode(inode, fattr); 626 nfs_free_fattr(fattr); 627 out: 628 trace_nfs_setattr_exit(inode, error); 629 return error; 630 } 631 EXPORT_SYMBOL_GPL(nfs_setattr); 632 633 /** 634 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 635 * @inode: inode of the file used 636 * @offset: file offset to start truncating 637 * 638 * This is a copy of the common vmtruncate, but with the locking 639 * corrected to take into account the fact that NFS requires 640 * inode->i_size to be updated under the inode->i_lock. 641 * Note: must be called with inode->i_lock held! 642 */ 643 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 644 { 645 int err; 646 647 err = inode_newsize_ok(inode, offset); 648 if (err) 649 goto out; 650 651 i_size_write(inode, offset); 652 /* Optimisation */ 653 if (offset == 0) 654 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 655 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 656 657 spin_unlock(&inode->i_lock); 658 truncate_pagecache(inode, offset); 659 spin_lock(&inode->i_lock); 660 out: 661 return err; 662 } 663 664 /** 665 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 666 * @inode: pointer to struct inode 667 * @attr: pointer to struct iattr 668 * @fattr: pointer to struct nfs_fattr 669 * 670 * Note: we do this in the *proc.c in order to ensure that 671 * it works for things like exclusive creates too. 672 */ 673 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 674 struct nfs_fattr *fattr) 675 { 676 /* Barrier: bump the attribute generation count. */ 677 nfs_fattr_set_barrier(fattr); 678 679 spin_lock(&inode->i_lock); 680 NFS_I(inode)->attr_gencount = fattr->gencount; 681 if ((attr->ia_valid & ATTR_SIZE) != 0) { 682 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 683 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 684 nfs_vmtruncate(inode, attr->ia_size); 685 } 686 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 687 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; 688 if ((attr->ia_valid & ATTR_MODE) != 0) { 689 int mode = attr->ia_mode & S_IALLUGO; 690 mode |= inode->i_mode & ~S_IALLUGO; 691 inode->i_mode = mode; 692 } 693 if ((attr->ia_valid & ATTR_UID) != 0) 694 inode->i_uid = attr->ia_uid; 695 if ((attr->ia_valid & ATTR_GID) != 0) 696 inode->i_gid = attr->ia_gid; 697 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 698 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 699 else 700 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 701 | NFS_INO_INVALID_CTIME); 702 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 703 | NFS_INO_INVALID_ACL); 704 } 705 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { 706 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME 707 | NFS_INO_INVALID_CTIME); 708 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 709 inode->i_atime = timespec_to_timespec64(fattr->atime); 710 else if (attr->ia_valid & ATTR_ATIME_SET) 711 inode->i_atime = attr->ia_atime; 712 else 713 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 714 715 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 716 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 717 else 718 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 719 | NFS_INO_INVALID_CTIME); 720 } 721 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { 722 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME 723 | NFS_INO_INVALID_CTIME); 724 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 725 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 726 else if (attr->ia_valid & ATTR_MTIME_SET) 727 inode->i_mtime = attr->ia_mtime; 728 else 729 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 730 731 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 732 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 733 else 734 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 735 | NFS_INO_INVALID_CTIME); 736 } 737 if (fattr->valid) 738 nfs_update_inode(inode, fattr); 739 spin_unlock(&inode->i_lock); 740 } 741 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 742 743 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) 744 { 745 struct dentry *parent; 746 747 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 748 return; 749 parent = dget_parent(dentry); 750 nfs_force_use_readdirplus(d_inode(parent)); 751 dput(parent); 752 } 753 754 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) 755 { 756 struct dentry *parent; 757 758 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 759 return; 760 parent = dget_parent(dentry); 761 nfs_advise_use_readdirplus(d_inode(parent)); 762 dput(parent); 763 } 764 765 static bool nfs_need_revalidate_inode(struct inode *inode) 766 { 767 if (NFS_I(inode)->cache_validity & 768 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 769 return true; 770 if (nfs_attribute_cache_expired(inode)) 771 return true; 772 return false; 773 } 774 775 int nfs_getattr(const struct path *path, struct kstat *stat, 776 u32 request_mask, unsigned int query_flags) 777 { 778 struct inode *inode = d_inode(path->dentry); 779 struct nfs_server *server = NFS_SERVER(inode); 780 unsigned long cache_validity; 781 int err = 0; 782 bool force_sync = query_flags & AT_STATX_FORCE_SYNC; 783 bool do_update = false; 784 785 trace_nfs_getattr_enter(inode); 786 787 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) 788 goto out_no_update; 789 790 /* Flush out writes to the server in order to update c/mtime. */ 791 if ((request_mask & (STATX_CTIME|STATX_MTIME)) && 792 S_ISREG(inode->i_mode)) { 793 err = filemap_write_and_wait(inode->i_mapping); 794 if (err) 795 goto out; 796 } 797 798 /* 799 * We may force a getattr if the user cares about atime. 800 * 801 * Note that we only have to check the vfsmount flags here: 802 * - NFS always sets S_NOATIME by so checking it would give a 803 * bogus result 804 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is 805 * no point in checking those. 806 */ 807 if ((path->mnt->mnt_flags & MNT_NOATIME) || 808 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 809 request_mask &= ~STATX_ATIME; 810 811 /* Is the user requesting attributes that might need revalidation? */ 812 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| 813 STATX_MTIME|STATX_UID|STATX_GID| 814 STATX_SIZE|STATX_BLOCKS))) 815 goto out_no_revalidate; 816 817 /* Check whether the cached attributes are stale */ 818 do_update |= force_sync || nfs_attribute_cache_expired(inode); 819 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 820 do_update |= cache_validity & 821 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL); 822 if (request_mask & STATX_ATIME) 823 do_update |= cache_validity & NFS_INO_INVALID_ATIME; 824 if (request_mask & (STATX_CTIME|STATX_MTIME)) 825 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE; 826 if (do_update) { 827 /* Update the attribute cache */ 828 if (!(server->flags & NFS_MOUNT_NOAC)) 829 nfs_readdirplus_parent_cache_miss(path->dentry); 830 else 831 nfs_readdirplus_parent_cache_hit(path->dentry); 832 err = __nfs_revalidate_inode(server, inode); 833 if (err) 834 goto out; 835 } else 836 nfs_readdirplus_parent_cache_hit(path->dentry); 837 out_no_revalidate: 838 /* Only return attributes that were revalidated. */ 839 stat->result_mask &= request_mask; 840 out_no_update: 841 generic_fillattr(inode, stat); 842 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 843 if (S_ISDIR(inode->i_mode)) 844 stat->blksize = NFS_SERVER(inode)->dtsize; 845 out: 846 trace_nfs_getattr_exit(inode, err); 847 return err; 848 } 849 EXPORT_SYMBOL_GPL(nfs_getattr); 850 851 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 852 { 853 refcount_set(&l_ctx->count, 1); 854 l_ctx->lockowner = current->files; 855 INIT_LIST_HEAD(&l_ctx->list); 856 atomic_set(&l_ctx->io_count, 0); 857 } 858 859 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 860 { 861 struct nfs_lock_context *pos; 862 863 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { 864 if (pos->lockowner != current->files) 865 continue; 866 if (refcount_inc_not_zero(&pos->count)) 867 return pos; 868 } 869 return NULL; 870 } 871 872 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 873 { 874 struct nfs_lock_context *res, *new = NULL; 875 struct inode *inode = d_inode(ctx->dentry); 876 877 rcu_read_lock(); 878 res = __nfs_find_lock_context(ctx); 879 rcu_read_unlock(); 880 if (res == NULL) { 881 new = kmalloc(sizeof(*new), GFP_KERNEL); 882 if (new == NULL) 883 return ERR_PTR(-ENOMEM); 884 nfs_init_lock_context(new); 885 spin_lock(&inode->i_lock); 886 res = __nfs_find_lock_context(ctx); 887 if (res == NULL) { 888 list_add_tail_rcu(&new->list, &ctx->lock_context.list); 889 new->open_context = ctx; 890 res = new; 891 new = NULL; 892 } 893 spin_unlock(&inode->i_lock); 894 kfree(new); 895 } 896 return res; 897 } 898 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 899 900 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 901 { 902 struct nfs_open_context *ctx = l_ctx->open_context; 903 struct inode *inode = d_inode(ctx->dentry); 904 905 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) 906 return; 907 list_del_rcu(&l_ctx->list); 908 spin_unlock(&inode->i_lock); 909 kfree_rcu(l_ctx, rcu_head); 910 } 911 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 912 913 /** 914 * nfs_close_context - Common close_context() routine NFSv2/v3 915 * @ctx: pointer to context 916 * @is_sync: is this a synchronous close 917 * 918 * Ensure that the attributes are up to date if we're mounted 919 * with close-to-open semantics and we have cached data that will 920 * need to be revalidated on open. 921 */ 922 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 923 { 924 struct nfs_inode *nfsi; 925 struct inode *inode; 926 struct nfs_server *server; 927 928 if (!(ctx->mode & FMODE_WRITE)) 929 return; 930 if (!is_sync) 931 return; 932 inode = d_inode(ctx->dentry); 933 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 934 return; 935 nfsi = NFS_I(inode); 936 if (inode->i_mapping->nrpages == 0) 937 return; 938 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 939 return; 940 if (!list_empty(&nfsi->open_files)) 941 return; 942 server = NFS_SERVER(inode); 943 if (server->flags & NFS_MOUNT_NOCTO) 944 return; 945 nfs_revalidate_inode(server, inode); 946 } 947 EXPORT_SYMBOL_GPL(nfs_close_context); 948 949 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 950 fmode_t f_mode, 951 struct file *filp) 952 { 953 struct nfs_open_context *ctx; 954 const struct cred *cred = get_current_cred(); 955 956 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 957 if (!ctx) { 958 put_cred(cred); 959 return ERR_PTR(-ENOMEM); 960 } 961 nfs_sb_active(dentry->d_sb); 962 ctx->dentry = dget(dentry); 963 ctx->cred = cred; 964 ctx->ll_cred = NULL; 965 ctx->state = NULL; 966 ctx->mode = f_mode; 967 ctx->flags = 0; 968 ctx->error = 0; 969 ctx->flock_owner = (fl_owner_t)filp; 970 nfs_init_lock_context(&ctx->lock_context); 971 ctx->lock_context.open_context = ctx; 972 INIT_LIST_HEAD(&ctx->list); 973 ctx->mdsthreshold = NULL; 974 return ctx; 975 } 976 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 977 978 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 979 { 980 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) 981 return ctx; 982 return NULL; 983 } 984 EXPORT_SYMBOL_GPL(get_nfs_open_context); 985 986 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 987 { 988 struct inode *inode = d_inode(ctx->dentry); 989 struct super_block *sb = ctx->dentry->d_sb; 990 991 if (!refcount_dec_and_test(&ctx->lock_context.count)) 992 return; 993 if (!list_empty(&ctx->list)) { 994 spin_lock(&inode->i_lock); 995 list_del_rcu(&ctx->list); 996 spin_unlock(&inode->i_lock); 997 } 998 if (inode != NULL) 999 NFS_PROTO(inode)->close_context(ctx, is_sync); 1000 put_cred(ctx->cred); 1001 dput(ctx->dentry); 1002 nfs_sb_deactive(sb); 1003 put_rpccred(ctx->ll_cred); 1004 kfree(ctx->mdsthreshold); 1005 kfree_rcu(ctx, rcu_head); 1006 } 1007 1008 void put_nfs_open_context(struct nfs_open_context *ctx) 1009 { 1010 __put_nfs_open_context(ctx, 0); 1011 } 1012 EXPORT_SYMBOL_GPL(put_nfs_open_context); 1013 1014 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 1015 { 1016 __put_nfs_open_context(ctx, 1); 1017 } 1018 1019 /* 1020 * Ensure that mmap has a recent RPC credential for use when writing out 1021 * shared pages 1022 */ 1023 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 1024 { 1025 struct inode *inode = d_inode(ctx->dentry); 1026 struct nfs_inode *nfsi = NFS_I(inode); 1027 1028 spin_lock(&inode->i_lock); 1029 list_add_tail_rcu(&ctx->list, &nfsi->open_files); 1030 spin_unlock(&inode->i_lock); 1031 } 1032 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 1033 1034 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 1035 { 1036 filp->private_data = get_nfs_open_context(ctx); 1037 if (list_empty(&ctx->list)) 1038 nfs_inode_attach_open_context(ctx); 1039 } 1040 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 1041 1042 /* 1043 * Given an inode, search for an open context with the desired characteristics 1044 */ 1045 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) 1046 { 1047 struct nfs_inode *nfsi = NFS_I(inode); 1048 struct nfs_open_context *pos, *ctx = NULL; 1049 1050 rcu_read_lock(); 1051 list_for_each_entry_rcu(pos, &nfsi->open_files, list) { 1052 if (cred != NULL && pos->cred != cred) 1053 continue; 1054 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 1055 continue; 1056 ctx = get_nfs_open_context(pos); 1057 if (ctx) 1058 break; 1059 } 1060 rcu_read_unlock(); 1061 return ctx; 1062 } 1063 1064 void nfs_file_clear_open_context(struct file *filp) 1065 { 1066 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1067 1068 if (ctx) { 1069 struct inode *inode = d_inode(ctx->dentry); 1070 1071 /* 1072 * We fatal error on write before. Try to writeback 1073 * every page again. 1074 */ 1075 if (ctx->error < 0) 1076 invalidate_inode_pages2(inode->i_mapping); 1077 filp->private_data = NULL; 1078 put_nfs_open_context_sync(ctx); 1079 } 1080 } 1081 1082 /* 1083 * These allocate and release file read/write context information. 1084 */ 1085 int nfs_open(struct inode *inode, struct file *filp) 1086 { 1087 struct nfs_open_context *ctx; 1088 1089 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); 1090 if (IS_ERR(ctx)) 1091 return PTR_ERR(ctx); 1092 nfs_file_set_open_context(filp, ctx); 1093 put_nfs_open_context(ctx); 1094 nfs_fscache_open_file(inode, filp); 1095 return 0; 1096 } 1097 1098 /* 1099 * This function is called whenever some part of NFS notices that 1100 * the cached attributes have to be refreshed. 1101 */ 1102 int 1103 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1104 { 1105 int status = -ESTALE; 1106 struct nfs4_label *label = NULL; 1107 struct nfs_fattr *fattr = NULL; 1108 struct nfs_inode *nfsi = NFS_I(inode); 1109 1110 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1111 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1112 1113 trace_nfs_revalidate_inode_enter(inode); 1114 1115 if (is_bad_inode(inode)) 1116 goto out; 1117 if (NFS_STALE(inode)) 1118 goto out; 1119 1120 /* pNFS: Attributes aren't updated until we layoutcommit */ 1121 if (S_ISREG(inode->i_mode)) { 1122 status = pnfs_sync_inode(inode, false); 1123 if (status) 1124 goto out; 1125 } 1126 1127 status = -ENOMEM; 1128 fattr = nfs_alloc_fattr(); 1129 if (fattr == NULL) 1130 goto out; 1131 1132 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1133 1134 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 1135 if (IS_ERR(label)) { 1136 status = PTR_ERR(label); 1137 goto out; 1138 } 1139 1140 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, 1141 label, inode); 1142 if (status != 0) { 1143 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1144 inode->i_sb->s_id, 1145 (unsigned long long)NFS_FILEID(inode), status); 1146 if (status == -ESTALE) { 1147 nfs_zap_caches(inode); 1148 if (!S_ISDIR(inode->i_mode)) 1149 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 1150 } 1151 goto err_out; 1152 } 1153 1154 status = nfs_refresh_inode(inode, fattr); 1155 if (status) { 1156 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1157 inode->i_sb->s_id, 1158 (unsigned long long)NFS_FILEID(inode), status); 1159 goto err_out; 1160 } 1161 1162 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1163 nfs_zap_acl_cache(inode); 1164 1165 nfs_setsecurity(inode, fattr, label); 1166 1167 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1168 inode->i_sb->s_id, 1169 (unsigned long long)NFS_FILEID(inode)); 1170 1171 err_out: 1172 nfs4_label_free(label); 1173 out: 1174 nfs_free_fattr(fattr); 1175 trace_nfs_revalidate_inode_exit(inode, status); 1176 return status; 1177 } 1178 1179 int nfs_attribute_cache_expired(struct inode *inode) 1180 { 1181 if (nfs_have_delegated_attributes(inode)) 1182 return 0; 1183 return nfs_attribute_timeout(inode); 1184 } 1185 1186 /** 1187 * nfs_revalidate_inode - Revalidate the inode attributes 1188 * @server: pointer to nfs_server struct 1189 * @inode: pointer to inode struct 1190 * 1191 * Updates inode attribute information by retrieving the data from the server. 1192 */ 1193 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1194 { 1195 if (!nfs_need_revalidate_inode(inode)) 1196 return NFS_STALE(inode) ? -ESTALE : 0; 1197 return __nfs_revalidate_inode(server, inode); 1198 } 1199 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1200 1201 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1202 { 1203 struct nfs_inode *nfsi = NFS_I(inode); 1204 int ret; 1205 1206 if (mapping->nrpages != 0) { 1207 if (S_ISREG(inode->i_mode)) { 1208 ret = nfs_sync_mapping(mapping); 1209 if (ret < 0) 1210 return ret; 1211 } 1212 ret = invalidate_inode_pages2(mapping); 1213 if (ret < 0) 1214 return ret; 1215 } 1216 if (S_ISDIR(inode->i_mode)) { 1217 spin_lock(&inode->i_lock); 1218 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1219 spin_unlock(&inode->i_lock); 1220 } 1221 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1222 nfs_fscache_wait_on_invalidate(inode); 1223 1224 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1225 inode->i_sb->s_id, 1226 (unsigned long long)NFS_FILEID(inode)); 1227 return 0; 1228 } 1229 1230 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1231 { 1232 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) || 1233 NFS_STALE(inode); 1234 } 1235 1236 int nfs_revalidate_mapping_rcu(struct inode *inode) 1237 { 1238 struct nfs_inode *nfsi = NFS_I(inode); 1239 unsigned long *bitlock = &nfsi->flags; 1240 int ret = 0; 1241 1242 if (IS_SWAPFILE(inode)) 1243 goto out; 1244 if (nfs_mapping_need_revalidate_inode(inode)) { 1245 ret = -ECHILD; 1246 goto out; 1247 } 1248 spin_lock(&inode->i_lock); 1249 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1250 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1251 ret = -ECHILD; 1252 spin_unlock(&inode->i_lock); 1253 out: 1254 return ret; 1255 } 1256 1257 /** 1258 * nfs_revalidate_mapping - Revalidate the pagecache 1259 * @inode: pointer to host inode 1260 * @mapping: pointer to mapping 1261 */ 1262 int nfs_revalidate_mapping(struct inode *inode, 1263 struct address_space *mapping) 1264 { 1265 struct nfs_inode *nfsi = NFS_I(inode); 1266 unsigned long *bitlock = &nfsi->flags; 1267 int ret = 0; 1268 1269 /* swapfiles are not supposed to be shared. */ 1270 if (IS_SWAPFILE(inode)) 1271 goto out; 1272 1273 if (nfs_mapping_need_revalidate_inode(inode)) { 1274 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1275 if (ret < 0) 1276 goto out; 1277 } 1278 1279 /* 1280 * We must clear NFS_INO_INVALID_DATA first to ensure that 1281 * invalidations that come in while we're shooting down the mappings 1282 * are respected. But, that leaves a race window where one revalidator 1283 * can clear the flag, and then another checks it before the mapping 1284 * gets invalidated. Fix that by serializing access to this part of 1285 * the function. 1286 * 1287 * At the same time, we need to allow other tasks to see whether we 1288 * might be in the middle of invalidating the pages, so we only set 1289 * the bit lock here if it looks like we're going to be doing that. 1290 */ 1291 for (;;) { 1292 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1293 nfs_wait_bit_killable, TASK_KILLABLE); 1294 if (ret) 1295 goto out; 1296 spin_lock(&inode->i_lock); 1297 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1298 spin_unlock(&inode->i_lock); 1299 continue; 1300 } 1301 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1302 break; 1303 spin_unlock(&inode->i_lock); 1304 goto out; 1305 } 1306 1307 set_bit(NFS_INO_INVALIDATING, bitlock); 1308 smp_wmb(); 1309 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1310 spin_unlock(&inode->i_lock); 1311 trace_nfs_invalidate_mapping_enter(inode); 1312 ret = nfs_invalidate_mapping(inode, mapping); 1313 trace_nfs_invalidate_mapping_exit(inode, ret); 1314 1315 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1316 smp_mb__after_atomic(); 1317 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1318 out: 1319 return ret; 1320 } 1321 1322 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1323 { 1324 struct inode *inode = &nfsi->vfs_inode; 1325 1326 if (!S_ISREG(inode->i_mode)) 1327 return false; 1328 if (list_empty(&nfsi->open_files)) 1329 return false; 1330 return inode_is_open_for_write(inode); 1331 } 1332 1333 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1334 { 1335 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1336 } 1337 1338 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1339 { 1340 struct timespec ts; 1341 1342 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1343 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1344 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { 1345 inode_set_iversion_raw(inode, fattr->change_attr); 1346 if (S_ISDIR(inode->i_mode)) 1347 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1348 } 1349 /* If we have atomic WCC data, we may update some attributes */ 1350 ts = timespec64_to_timespec(inode->i_ctime); 1351 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1352 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1353 && timespec_equal(&ts, &fattr->pre_ctime)) { 1354 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 1355 } 1356 1357 ts = timespec64_to_timespec(inode->i_mtime); 1358 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1359 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1360 && timespec_equal(&ts, &fattr->pre_mtime)) { 1361 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 1362 if (S_ISDIR(inode->i_mode)) 1363 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1364 } 1365 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1366 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1367 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1368 && !nfs_have_writebacks(inode)) { 1369 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1370 } 1371 } 1372 1373 /** 1374 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1375 * @inode: pointer to inode 1376 * @fattr: updated attributes 1377 * 1378 * Verifies the attribute cache. If we have just changed the attributes, 1379 * so that fattr carries weak cache consistency data, then it may 1380 * also update the ctime/mtime/change_attribute. 1381 */ 1382 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1383 { 1384 struct nfs_inode *nfsi = NFS_I(inode); 1385 loff_t cur_size, new_isize; 1386 unsigned long invalid = 0; 1387 struct timespec ts; 1388 1389 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1390 return 0; 1391 1392 /* Has the inode gone and changed behind our back? */ 1393 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1394 return -ESTALE; 1395 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1396 return -ESTALE; 1397 1398 if (!nfs_file_has_buffered_writers(nfsi)) { 1399 /* Verify a few of the more important attributes */ 1400 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) 1401 invalid |= NFS_INO_INVALID_CHANGE 1402 | NFS_INO_REVAL_PAGECACHE; 1403 1404 ts = timespec64_to_timespec(inode->i_mtime); 1405 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime)) 1406 invalid |= NFS_INO_INVALID_MTIME; 1407 1408 ts = timespec64_to_timespec(inode->i_ctime); 1409 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime)) 1410 invalid |= NFS_INO_INVALID_CTIME; 1411 1412 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1413 cur_size = i_size_read(inode); 1414 new_isize = nfs_size_to_loff_t(fattr->size); 1415 if (cur_size != new_isize) 1416 invalid |= NFS_INO_INVALID_SIZE 1417 | NFS_INO_REVAL_PAGECACHE; 1418 } 1419 } 1420 1421 /* Have any file permissions changed? */ 1422 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1423 invalid |= NFS_INO_INVALID_ACCESS 1424 | NFS_INO_INVALID_ACL 1425 | NFS_INO_INVALID_OTHER; 1426 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1427 invalid |= NFS_INO_INVALID_ACCESS 1428 | NFS_INO_INVALID_ACL 1429 | NFS_INO_INVALID_OTHER; 1430 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1431 invalid |= NFS_INO_INVALID_ACCESS 1432 | NFS_INO_INVALID_ACL 1433 | NFS_INO_INVALID_OTHER; 1434 1435 /* Has the link count changed? */ 1436 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1437 invalid |= NFS_INO_INVALID_OTHER; 1438 1439 ts = timespec64_to_timespec(inode->i_atime); 1440 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime)) 1441 invalid |= NFS_INO_INVALID_ATIME; 1442 1443 if (invalid != 0) 1444 nfs_set_cache_invalid(inode, invalid); 1445 1446 nfsi->read_cache_jiffies = fattr->time_start; 1447 return 0; 1448 } 1449 1450 static atomic_long_t nfs_attr_generation_counter; 1451 1452 static unsigned long nfs_read_attr_generation_counter(void) 1453 { 1454 return atomic_long_read(&nfs_attr_generation_counter); 1455 } 1456 1457 unsigned long nfs_inc_attr_generation_counter(void) 1458 { 1459 return atomic_long_inc_return(&nfs_attr_generation_counter); 1460 } 1461 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1462 1463 void nfs_fattr_init(struct nfs_fattr *fattr) 1464 { 1465 fattr->valid = 0; 1466 fattr->time_start = jiffies; 1467 fattr->gencount = nfs_inc_attr_generation_counter(); 1468 fattr->owner_name = NULL; 1469 fattr->group_name = NULL; 1470 } 1471 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1472 1473 /** 1474 * nfs_fattr_set_barrier 1475 * @fattr: attributes 1476 * 1477 * Used to set a barrier after an attribute was updated. This 1478 * barrier ensures that older attributes from RPC calls that may 1479 * have raced with our update cannot clobber these new values. 1480 * Note that you are still responsible for ensuring that other 1481 * operations which change the attribute on the server do not 1482 * collide. 1483 */ 1484 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1485 { 1486 fattr->gencount = nfs_inc_attr_generation_counter(); 1487 } 1488 1489 struct nfs_fattr *nfs_alloc_fattr(void) 1490 { 1491 struct nfs_fattr *fattr; 1492 1493 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1494 if (fattr != NULL) 1495 nfs_fattr_init(fattr); 1496 return fattr; 1497 } 1498 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1499 1500 struct nfs_fh *nfs_alloc_fhandle(void) 1501 { 1502 struct nfs_fh *fh; 1503 1504 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1505 if (fh != NULL) 1506 fh->size = 0; 1507 return fh; 1508 } 1509 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1510 1511 #ifdef NFS_DEBUG 1512 /* 1513 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1514 * in the same way that wireshark does 1515 * 1516 * @fh: file handle 1517 * 1518 * For debugging only. 1519 */ 1520 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1521 { 1522 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1523 * not on the result */ 1524 return nfs_fhandle_hash(fh); 1525 } 1526 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1527 1528 /* 1529 * _nfs_display_fhandle - display an NFS file handle on the console 1530 * 1531 * @fh: file handle to display 1532 * @caption: display caption 1533 * 1534 * For debugging only. 1535 */ 1536 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1537 { 1538 unsigned short i; 1539 1540 if (fh == NULL || fh->size == 0) { 1541 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1542 return; 1543 } 1544 1545 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1546 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1547 for (i = 0; i < fh->size; i += 16) { 1548 __be32 *pos = (__be32 *)&fh->data[i]; 1549 1550 switch ((fh->size - i - 1) >> 2) { 1551 case 0: 1552 printk(KERN_DEFAULT " %08x\n", 1553 be32_to_cpup(pos)); 1554 break; 1555 case 1: 1556 printk(KERN_DEFAULT " %08x %08x\n", 1557 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1558 break; 1559 case 2: 1560 printk(KERN_DEFAULT " %08x %08x %08x\n", 1561 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1562 be32_to_cpup(pos + 2)); 1563 break; 1564 default: 1565 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1566 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1567 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1568 } 1569 } 1570 } 1571 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1572 #endif 1573 1574 /** 1575 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1576 * @inode: pointer to inode 1577 * @fattr: attributes 1578 * 1579 * Attempt to divine whether or not an RPC call reply carrying stale 1580 * attributes got scheduled after another call carrying updated ones. 1581 * 1582 * To do so, the function first assumes that a more recent ctime means 1583 * that the attributes in fattr are newer, however it also attempt to 1584 * catch the case where ctime either didn't change, or went backwards 1585 * (if someone reset the clock on the server) by looking at whether 1586 * or not this RPC call was started after the inode was last updated. 1587 * Note also the check for wraparound of 'attr_gencount' 1588 * 1589 * The function returns 'true' if it thinks the attributes in 'fattr' are 1590 * more recent than the ones cached in the inode. 1591 * 1592 */ 1593 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1594 { 1595 const struct nfs_inode *nfsi = NFS_I(inode); 1596 1597 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1598 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1599 } 1600 1601 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1602 { 1603 int ret; 1604 1605 trace_nfs_refresh_inode_enter(inode); 1606 1607 if (nfs_inode_attrs_need_update(inode, fattr)) 1608 ret = nfs_update_inode(inode, fattr); 1609 else 1610 ret = nfs_check_inode_attributes(inode, fattr); 1611 1612 trace_nfs_refresh_inode_exit(inode, ret); 1613 return ret; 1614 } 1615 1616 /** 1617 * nfs_refresh_inode - try to update the inode attribute cache 1618 * @inode: pointer to inode 1619 * @fattr: updated attributes 1620 * 1621 * Check that an RPC call that returned attributes has not overlapped with 1622 * other recent updates of the inode metadata, then decide whether it is 1623 * safe to do a full update of the inode attributes, or whether just to 1624 * call nfs_check_inode_attributes. 1625 */ 1626 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1627 { 1628 int status; 1629 1630 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1631 return 0; 1632 spin_lock(&inode->i_lock); 1633 status = nfs_refresh_inode_locked(inode, fattr); 1634 spin_unlock(&inode->i_lock); 1635 1636 return status; 1637 } 1638 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1639 1640 static int nfs_post_op_update_inode_locked(struct inode *inode, 1641 struct nfs_fattr *fattr, unsigned int invalid) 1642 { 1643 if (S_ISDIR(inode->i_mode)) 1644 invalid |= NFS_INO_INVALID_DATA; 1645 nfs_set_cache_invalid(inode, invalid); 1646 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1647 return 0; 1648 return nfs_refresh_inode_locked(inode, fattr); 1649 } 1650 1651 /** 1652 * nfs_post_op_update_inode - try to update the inode attribute cache 1653 * @inode: pointer to inode 1654 * @fattr: updated attributes 1655 * 1656 * After an operation that has changed the inode metadata, mark the 1657 * attribute cache as being invalid, then try to update it. 1658 * 1659 * NB: if the server didn't return any post op attributes, this 1660 * function will force the retrieval of attributes before the next 1661 * NFS request. Thus it should be used only for operations that 1662 * are expected to change one or more attributes, to avoid 1663 * unnecessary NFS requests and trips through nfs_update_inode(). 1664 */ 1665 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1666 { 1667 int status; 1668 1669 spin_lock(&inode->i_lock); 1670 nfs_fattr_set_barrier(fattr); 1671 status = nfs_post_op_update_inode_locked(inode, fattr, 1672 NFS_INO_INVALID_CHANGE 1673 | NFS_INO_INVALID_CTIME 1674 | NFS_INO_REVAL_FORCED); 1675 spin_unlock(&inode->i_lock); 1676 1677 return status; 1678 } 1679 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1680 1681 /** 1682 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1683 * @inode: pointer to inode 1684 * @fattr: updated attributes 1685 * 1686 * After an operation that has changed the inode metadata, mark the 1687 * attribute cache as being invalid, then try to update it. Fake up 1688 * weak cache consistency data, if none exist. 1689 * 1690 * This function is mainly designed to be used by the ->write_done() functions. 1691 */ 1692 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1693 { 1694 int status; 1695 1696 /* Don't do a WCC update if these attributes are already stale */ 1697 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1698 !nfs_inode_attrs_need_update(inode, fattr)) { 1699 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1700 | NFS_ATTR_FATTR_PRESIZE 1701 | NFS_ATTR_FATTR_PREMTIME 1702 | NFS_ATTR_FATTR_PRECTIME); 1703 goto out_noforce; 1704 } 1705 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1706 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1707 fattr->pre_change_attr = inode_peek_iversion_raw(inode); 1708 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1709 } 1710 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1711 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1712 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime); 1713 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1714 } 1715 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1716 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1717 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime); 1718 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1719 } 1720 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1721 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1722 fattr->pre_size = i_size_read(inode); 1723 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1724 } 1725 out_noforce: 1726 status = nfs_post_op_update_inode_locked(inode, fattr, 1727 NFS_INO_INVALID_CHANGE 1728 | NFS_INO_INVALID_CTIME 1729 | NFS_INO_INVALID_MTIME); 1730 return status; 1731 } 1732 1733 /** 1734 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1735 * @inode: pointer to inode 1736 * @fattr: updated attributes 1737 * 1738 * After an operation that has changed the inode metadata, mark the 1739 * attribute cache as being invalid, then try to update it. Fake up 1740 * weak cache consistency data, if none exist. 1741 * 1742 * This function is mainly designed to be used by the ->write_done() functions. 1743 */ 1744 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1745 { 1746 int status; 1747 1748 spin_lock(&inode->i_lock); 1749 nfs_fattr_set_barrier(fattr); 1750 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1751 spin_unlock(&inode->i_lock); 1752 return status; 1753 } 1754 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1755 1756 1757 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1758 struct nfs_fattr *fattr) 1759 { 1760 bool ret1 = true, ret2 = true; 1761 1762 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1763 ret1 = (nfsi->fileid == fattr->fileid); 1764 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1765 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1766 return ret1 || ret2; 1767 } 1768 1769 /* 1770 * Many nfs protocol calls return the new file attributes after 1771 * an operation. Here we update the inode to reflect the state 1772 * of the server's inode. 1773 * 1774 * This is a bit tricky because we have to make sure all dirty pages 1775 * have been sent off to the server before calling invalidate_inode_pages. 1776 * To make sure no other process adds more write requests while we try 1777 * our best to flush them, we make them sleep during the attribute refresh. 1778 * 1779 * A very similar scenario holds for the dir cache. 1780 */ 1781 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1782 { 1783 struct nfs_server *server; 1784 struct nfs_inode *nfsi = NFS_I(inode); 1785 loff_t cur_isize, new_isize; 1786 unsigned long invalid = 0; 1787 unsigned long now = jiffies; 1788 unsigned long save_cache_validity; 1789 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1790 bool cache_revalidated = true; 1791 bool attr_changed = false; 1792 bool have_delegation; 1793 1794 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1795 __func__, inode->i_sb->s_id, inode->i_ino, 1796 nfs_display_fhandle_hash(NFS_FH(inode)), 1797 atomic_read(&inode->i_count), fattr->valid); 1798 1799 if (!nfs_fileid_valid(nfsi, fattr)) { 1800 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1801 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1802 NFS_SERVER(inode)->nfs_client->cl_hostname, 1803 inode->i_sb->s_id, (long long)nfsi->fileid, 1804 (long long)fattr->fileid); 1805 goto out_err; 1806 } 1807 1808 /* 1809 * Make sure the inode's type hasn't changed. 1810 */ 1811 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1812 /* 1813 * Big trouble! The inode has become a different object. 1814 */ 1815 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1816 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1817 goto out_err; 1818 } 1819 1820 server = NFS_SERVER(inode); 1821 /* Update the fsid? */ 1822 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1823 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1824 !IS_AUTOMOUNT(inode)) 1825 server->fsid = fattr->fsid; 1826 1827 /* Save the delegation state before clearing cache_validity */ 1828 have_delegation = nfs_have_delegated_attributes(inode); 1829 1830 /* 1831 * Update the read time so we don't revalidate too often. 1832 */ 1833 nfsi->read_cache_jiffies = fattr->time_start; 1834 1835 save_cache_validity = nfsi->cache_validity; 1836 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1837 | NFS_INO_INVALID_ATIME 1838 | NFS_INO_REVAL_FORCED 1839 | NFS_INO_REVAL_PAGECACHE); 1840 1841 /* Do atomic weak cache consistency updates */ 1842 nfs_wcc_update_inode(inode, fattr); 1843 1844 if (pnfs_layoutcommit_outstanding(inode)) { 1845 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; 1846 cache_revalidated = false; 1847 } 1848 1849 /* More cache consistency checks */ 1850 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1851 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { 1852 /* Could it be a race with writeback? */ 1853 if (!(have_writers || have_delegation)) { 1854 invalid |= NFS_INO_INVALID_DATA 1855 | NFS_INO_INVALID_ACCESS 1856 | NFS_INO_INVALID_ACL; 1857 /* Force revalidate of all attributes */ 1858 save_cache_validity |= NFS_INO_INVALID_CTIME 1859 | NFS_INO_INVALID_MTIME 1860 | NFS_INO_INVALID_SIZE 1861 | NFS_INO_INVALID_OTHER; 1862 if (S_ISDIR(inode->i_mode)) 1863 nfs_force_lookup_revalidate(inode); 1864 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1865 inode->i_sb->s_id, 1866 inode->i_ino); 1867 } 1868 inode_set_iversion_raw(inode, fattr->change_attr); 1869 attr_changed = true; 1870 } 1871 } else { 1872 nfsi->cache_validity |= save_cache_validity & 1873 (NFS_INO_INVALID_CHANGE 1874 | NFS_INO_REVAL_PAGECACHE 1875 | NFS_INO_REVAL_FORCED); 1876 cache_revalidated = false; 1877 } 1878 1879 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1880 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 1881 } else if (server->caps & NFS_CAP_MTIME) { 1882 nfsi->cache_validity |= save_cache_validity & 1883 (NFS_INO_INVALID_MTIME 1884 | NFS_INO_REVAL_FORCED); 1885 cache_revalidated = false; 1886 } 1887 1888 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1889 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 1890 } else if (server->caps & NFS_CAP_CTIME) { 1891 nfsi->cache_validity |= save_cache_validity & 1892 (NFS_INO_INVALID_CTIME 1893 | NFS_INO_REVAL_FORCED); 1894 cache_revalidated = false; 1895 } 1896 1897 /* Check if our cached file size is stale */ 1898 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1899 new_isize = nfs_size_to_loff_t(fattr->size); 1900 cur_isize = i_size_read(inode); 1901 if (new_isize != cur_isize && !have_delegation) { 1902 /* Do we perhaps have any outstanding writes, or has 1903 * the file grown beyond our last write? */ 1904 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 1905 i_size_write(inode, new_isize); 1906 if (!have_writers) 1907 invalid |= NFS_INO_INVALID_DATA; 1908 attr_changed = true; 1909 } 1910 dprintk("NFS: isize change on server for file %s/%ld " 1911 "(%Ld to %Ld)\n", 1912 inode->i_sb->s_id, 1913 inode->i_ino, 1914 (long long)cur_isize, 1915 (long long)new_isize); 1916 } 1917 } else { 1918 nfsi->cache_validity |= save_cache_validity & 1919 (NFS_INO_INVALID_SIZE 1920 | NFS_INO_REVAL_PAGECACHE 1921 | NFS_INO_REVAL_FORCED); 1922 cache_revalidated = false; 1923 } 1924 1925 1926 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1927 inode->i_atime = timespec_to_timespec64(fattr->atime); 1928 else if (server->caps & NFS_CAP_ATIME) { 1929 nfsi->cache_validity |= save_cache_validity & 1930 (NFS_INO_INVALID_ATIME 1931 | NFS_INO_REVAL_FORCED); 1932 cache_revalidated = false; 1933 } 1934 1935 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1936 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1937 umode_t newmode = inode->i_mode & S_IFMT; 1938 newmode |= fattr->mode & S_IALLUGO; 1939 inode->i_mode = newmode; 1940 invalid |= NFS_INO_INVALID_ACCESS 1941 | NFS_INO_INVALID_ACL; 1942 attr_changed = true; 1943 } 1944 } else if (server->caps & NFS_CAP_MODE) { 1945 nfsi->cache_validity |= save_cache_validity & 1946 (NFS_INO_INVALID_OTHER 1947 | NFS_INO_REVAL_FORCED); 1948 cache_revalidated = false; 1949 } 1950 1951 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1952 if (!uid_eq(inode->i_uid, fattr->uid)) { 1953 invalid |= NFS_INO_INVALID_ACCESS 1954 | NFS_INO_INVALID_ACL; 1955 inode->i_uid = fattr->uid; 1956 attr_changed = true; 1957 } 1958 } else if (server->caps & NFS_CAP_OWNER) { 1959 nfsi->cache_validity |= save_cache_validity & 1960 (NFS_INO_INVALID_OTHER 1961 | NFS_INO_REVAL_FORCED); 1962 cache_revalidated = false; 1963 } 1964 1965 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1966 if (!gid_eq(inode->i_gid, fattr->gid)) { 1967 invalid |= NFS_INO_INVALID_ACCESS 1968 | NFS_INO_INVALID_ACL; 1969 inode->i_gid = fattr->gid; 1970 attr_changed = true; 1971 } 1972 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1973 nfsi->cache_validity |= save_cache_validity & 1974 (NFS_INO_INVALID_OTHER 1975 | NFS_INO_REVAL_FORCED); 1976 cache_revalidated = false; 1977 } 1978 1979 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1980 if (inode->i_nlink != fattr->nlink) { 1981 if (S_ISDIR(inode->i_mode)) 1982 invalid |= NFS_INO_INVALID_DATA; 1983 set_nlink(inode, fattr->nlink); 1984 attr_changed = true; 1985 } 1986 } else if (server->caps & NFS_CAP_NLINK) { 1987 nfsi->cache_validity |= save_cache_validity & 1988 (NFS_INO_INVALID_OTHER 1989 | NFS_INO_REVAL_FORCED); 1990 cache_revalidated = false; 1991 } 1992 1993 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1994 /* 1995 * report the blocks in 512byte units 1996 */ 1997 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1998 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1999 inode->i_blocks = fattr->du.nfs2.blocks; 2000 else 2001 cache_revalidated = false; 2002 2003 /* Update attrtimeo value if we're out of the unstable period */ 2004 if (attr_changed) { 2005 invalid &= ~NFS_INO_INVALID_ATTR; 2006 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 2007 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 2008 nfsi->attrtimeo_timestamp = now; 2009 /* Set barrier to be more recent than all outstanding updates */ 2010 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 2011 } else { 2012 if (cache_revalidated) { 2013 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 2014 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 2015 nfsi->attrtimeo <<= 1; 2016 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 2017 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 2018 } 2019 nfsi->attrtimeo_timestamp = now; 2020 } 2021 /* Set the barrier to be more recent than this fattr */ 2022 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 2023 nfsi->attr_gencount = fattr->gencount; 2024 } 2025 2026 /* Don't invalidate the data if we were to blame */ 2027 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 2028 || S_ISLNK(inode->i_mode))) 2029 invalid &= ~NFS_INO_INVALID_DATA; 2030 nfs_set_cache_invalid(inode, invalid); 2031 2032 return 0; 2033 out_err: 2034 /* 2035 * No need to worry about unhashing the dentry, as the 2036 * lookup validation will know that the inode is bad. 2037 * (But we fall through to invalidate the caches.) 2038 */ 2039 nfs_invalidate_inode(inode); 2040 return -ESTALE; 2041 } 2042 2043 struct inode *nfs_alloc_inode(struct super_block *sb) 2044 { 2045 struct nfs_inode *nfsi; 2046 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 2047 if (!nfsi) 2048 return NULL; 2049 nfsi->flags = 0UL; 2050 nfsi->cache_validity = 0UL; 2051 #if IS_ENABLED(CONFIG_NFS_V4) 2052 nfsi->nfs4_acl = NULL; 2053 #endif /* CONFIG_NFS_V4 */ 2054 return &nfsi->vfs_inode; 2055 } 2056 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 2057 2058 static void nfs_i_callback(struct rcu_head *head) 2059 { 2060 struct inode *inode = container_of(head, struct inode, i_rcu); 2061 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 2062 } 2063 2064 void nfs_destroy_inode(struct inode *inode) 2065 { 2066 call_rcu(&inode->i_rcu, nfs_i_callback); 2067 } 2068 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 2069 2070 static inline void nfs4_init_once(struct nfs_inode *nfsi) 2071 { 2072 #if IS_ENABLED(CONFIG_NFS_V4) 2073 INIT_LIST_HEAD(&nfsi->open_states); 2074 nfsi->delegation = NULL; 2075 init_rwsem(&nfsi->rwsem); 2076 nfsi->layout = NULL; 2077 #endif 2078 } 2079 2080 static void init_once(void *foo) 2081 { 2082 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 2083 2084 inode_init_once(&nfsi->vfs_inode); 2085 INIT_LIST_HEAD(&nfsi->open_files); 2086 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2087 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2088 INIT_LIST_HEAD(&nfsi->commit_info.list); 2089 atomic_long_set(&nfsi->nrequests, 0); 2090 atomic_long_set(&nfsi->commit_info.ncommit, 0); 2091 atomic_set(&nfsi->commit_info.rpcs_out, 0); 2092 init_rwsem(&nfsi->rmdir_sem); 2093 mutex_init(&nfsi->commit_mutex); 2094 nfs4_init_once(nfsi); 2095 } 2096 2097 static int __init nfs_init_inodecache(void) 2098 { 2099 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2100 sizeof(struct nfs_inode), 2101 0, (SLAB_RECLAIM_ACCOUNT| 2102 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 2103 init_once); 2104 if (nfs_inode_cachep == NULL) 2105 return -ENOMEM; 2106 2107 return 0; 2108 } 2109 2110 static void nfs_destroy_inodecache(void) 2111 { 2112 /* 2113 * Make sure all delayed rcu free inodes are flushed before we 2114 * destroy cache. 2115 */ 2116 rcu_barrier(); 2117 kmem_cache_destroy(nfs_inode_cachep); 2118 } 2119 2120 struct workqueue_struct *nfsiod_workqueue; 2121 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2122 2123 /* 2124 * start up the nfsiod workqueue 2125 */ 2126 static int nfsiod_start(void) 2127 { 2128 struct workqueue_struct *wq; 2129 dprintk("RPC: creating workqueue nfsiod\n"); 2130 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2131 if (wq == NULL) 2132 return -ENOMEM; 2133 nfsiod_workqueue = wq; 2134 return 0; 2135 } 2136 2137 /* 2138 * Destroy the nfsiod workqueue 2139 */ 2140 static void nfsiod_stop(void) 2141 { 2142 struct workqueue_struct *wq; 2143 2144 wq = nfsiod_workqueue; 2145 if (wq == NULL) 2146 return; 2147 nfsiod_workqueue = NULL; 2148 destroy_workqueue(wq); 2149 } 2150 2151 unsigned int nfs_net_id; 2152 EXPORT_SYMBOL_GPL(nfs_net_id); 2153 2154 static int nfs_net_init(struct net *net) 2155 { 2156 nfs_clients_init(net); 2157 return nfs_fs_proc_net_init(net); 2158 } 2159 2160 static void nfs_net_exit(struct net *net) 2161 { 2162 struct nfs_net *nn = net_generic(net, nfs_net_id); 2163 2164 nfs_fs_proc_net_exit(net); 2165 nfs_cleanup_cb_ident_idr(net); 2166 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 2167 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 2168 } 2169 2170 static struct pernet_operations nfs_net_ops = { 2171 .init = nfs_net_init, 2172 .exit = nfs_net_exit, 2173 .id = &nfs_net_id, 2174 .size = sizeof(struct nfs_net), 2175 }; 2176 2177 /* 2178 * Initialize NFS 2179 */ 2180 static int __init init_nfs_fs(void) 2181 { 2182 int err; 2183 2184 err = register_pernet_subsys(&nfs_net_ops); 2185 if (err < 0) 2186 goto out9; 2187 2188 err = nfs_fscache_register(); 2189 if (err < 0) 2190 goto out8; 2191 2192 err = nfsiod_start(); 2193 if (err) 2194 goto out7; 2195 2196 err = nfs_fs_proc_init(); 2197 if (err) 2198 goto out6; 2199 2200 err = nfs_init_nfspagecache(); 2201 if (err) 2202 goto out5; 2203 2204 err = nfs_init_inodecache(); 2205 if (err) 2206 goto out4; 2207 2208 err = nfs_init_readpagecache(); 2209 if (err) 2210 goto out3; 2211 2212 err = nfs_init_writepagecache(); 2213 if (err) 2214 goto out2; 2215 2216 err = nfs_init_directcache(); 2217 if (err) 2218 goto out1; 2219 2220 rpc_proc_register(&init_net, &nfs_rpcstat); 2221 2222 err = register_nfs_fs(); 2223 if (err) 2224 goto out0; 2225 2226 return 0; 2227 out0: 2228 rpc_proc_unregister(&init_net, "nfs"); 2229 nfs_destroy_directcache(); 2230 out1: 2231 nfs_destroy_writepagecache(); 2232 out2: 2233 nfs_destroy_readpagecache(); 2234 out3: 2235 nfs_destroy_inodecache(); 2236 out4: 2237 nfs_destroy_nfspagecache(); 2238 out5: 2239 nfs_fs_proc_exit(); 2240 out6: 2241 nfsiod_stop(); 2242 out7: 2243 nfs_fscache_unregister(); 2244 out8: 2245 unregister_pernet_subsys(&nfs_net_ops); 2246 out9: 2247 return err; 2248 } 2249 2250 static void __exit exit_nfs_fs(void) 2251 { 2252 nfs_destroy_directcache(); 2253 nfs_destroy_writepagecache(); 2254 nfs_destroy_readpagecache(); 2255 nfs_destroy_inodecache(); 2256 nfs_destroy_nfspagecache(); 2257 nfs_fscache_unregister(); 2258 unregister_pernet_subsys(&nfs_net_ops); 2259 rpc_proc_unregister(&init_net, "nfs"); 2260 unregister_nfs_fs(); 2261 nfs_fs_proc_exit(); 2262 nfsiod_stop(); 2263 } 2264 2265 /* Not quite true; I just maintain it */ 2266 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2267 MODULE_LICENSE("GPL"); 2268 module_param(enable_ino64, bool, 0644); 2269 2270 module_init(init_nfs_fs) 2271 module_exit(exit_nfs_fs) 2272