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