1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/nfs/inode.c 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * 7 * nfs inode and superblock handling functions 8 * 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 11 * 12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 13 * J.S.Peatfield@damtp.cam.ac.uk 14 * 15 */ 16 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/sched/signal.h> 20 #include <linux/time.h> 21 #include <linux/kernel.h> 22 #include <linux/mm.h> 23 #include <linux/string.h> 24 #include <linux/stat.h> 25 #include <linux/errno.h> 26 #include <linux/unistd.h> 27 #include <linux/sunrpc/clnt.h> 28 #include <linux/sunrpc/stats.h> 29 #include <linux/sunrpc/metrics.h> 30 #include <linux/nfs_fs.h> 31 #include <linux/nfs_mount.h> 32 #include <linux/nfs4_mount.h> 33 #include <linux/lockd/bind.h> 34 #include <linux/seq_file.h> 35 #include <linux/mount.h> 36 #include <linux/vfs.h> 37 #include <linux/inet.h> 38 #include <linux/nfs_xdr.h> 39 #include <linux/slab.h> 40 #include <linux/compat.h> 41 #include <linux/freezer.h> 42 #include <linux/uaccess.h> 43 #include <linux/iversion.h> 44 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "pnfs.h" 52 #include "nfs.h" 53 #include "netns.h" 54 #include "sysfs.h" 55 56 #include "nfstrace.h" 57 58 #define NFSDBG_FACILITY NFSDBG_VFS 59 60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 61 62 /* Default is to see 64-bit inode numbers */ 63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 64 65 static void nfs_invalidate_inode(struct inode *); 66 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 67 68 static struct kmem_cache * nfs_inode_cachep; 69 70 static inline unsigned long 71 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 72 { 73 return nfs_fileid_to_ino_t(fattr->fileid); 74 } 75 76 static int nfs_wait_killable(int mode) 77 { 78 freezable_schedule_unsafe(); 79 if (signal_pending_state(mode, current)) 80 return -ERESTARTSYS; 81 return 0; 82 } 83 84 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 85 { 86 return nfs_wait_killable(mode); 87 } 88 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 89 90 /** 91 * nfs_compat_user_ino64 - returns the user-visible inode number 92 * @fileid: 64-bit fileid 93 * 94 * This function returns a 32-bit inode number if the boot parameter 95 * nfs.enable_ino64 is zero. 96 */ 97 u64 nfs_compat_user_ino64(u64 fileid) 98 { 99 #ifdef CONFIG_COMPAT 100 compat_ulong_t ino; 101 #else 102 unsigned long ino; 103 #endif 104 105 if (enable_ino64) 106 return fileid; 107 ino = fileid; 108 if (sizeof(ino) < sizeof(fileid)) 109 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 110 return ino; 111 } 112 113 int nfs_drop_inode(struct inode *inode) 114 { 115 return NFS_STALE(inode) || generic_drop_inode(inode); 116 } 117 EXPORT_SYMBOL_GPL(nfs_drop_inode); 118 119 void nfs_clear_inode(struct inode *inode) 120 { 121 /* 122 * The following should never happen... 123 */ 124 WARN_ON_ONCE(nfs_have_writebacks(inode)); 125 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 126 nfs_zap_acl_cache(inode); 127 nfs_access_zap_cache(inode); 128 nfs_fscache_clear_inode(inode); 129 } 130 EXPORT_SYMBOL_GPL(nfs_clear_inode); 131 132 void nfs_evict_inode(struct inode *inode) 133 { 134 truncate_inode_pages_final(&inode->i_data); 135 clear_inode(inode); 136 nfs_clear_inode(inode); 137 } 138 139 int nfs_sync_inode(struct inode *inode) 140 { 141 inode_dio_wait(inode); 142 return nfs_wb_all(inode); 143 } 144 EXPORT_SYMBOL_GPL(nfs_sync_inode); 145 146 /** 147 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 148 * @mapping: pointer to struct address_space 149 */ 150 int nfs_sync_mapping(struct address_space *mapping) 151 { 152 int ret = 0; 153 154 if (mapping->nrpages != 0) { 155 unmap_mapping_range(mapping, 0, 0, 0); 156 ret = nfs_wb_all(mapping->host); 157 } 158 return ret; 159 } 160 161 static int nfs_attribute_timeout(struct inode *inode) 162 { 163 struct nfs_inode *nfsi = NFS_I(inode); 164 165 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 166 } 167 168 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags) 169 { 170 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 171 172 /* Special case for the pagecache or access cache */ 173 if (flags == NFS_INO_REVAL_PAGECACHE && 174 !(cache_validity & NFS_INO_REVAL_FORCED)) 175 return false; 176 return (cache_validity & flags) != 0; 177 } 178 179 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags) 180 { 181 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 182 183 if ((cache_validity & flags) != 0) 184 return true; 185 if (nfs_attribute_timeout(inode)) 186 return true; 187 return false; 188 } 189 190 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) 191 { 192 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 193 return nfs_check_cache_invalid_delegated(inode, flags); 194 195 return nfs_check_cache_invalid_not_delegated(inode, flags); 196 } 197 198 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 199 { 200 struct nfs_inode *nfsi = NFS_I(inode); 201 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ); 202 203 if (have_delegation) { 204 if (!(flags & NFS_INO_REVAL_FORCED)) 205 flags &= ~NFS_INO_INVALID_OTHER; 206 flags &= ~(NFS_INO_INVALID_CHANGE 207 | NFS_INO_INVALID_SIZE 208 | NFS_INO_REVAL_PAGECACHE); 209 } 210 211 if (inode->i_mapping->nrpages == 0) 212 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER); 213 nfsi->cache_validity |= flags; 214 if (flags & NFS_INO_INVALID_DATA) 215 nfs_fscache_invalidate(inode); 216 } 217 218 /* 219 * Invalidate the local caches 220 */ 221 static void nfs_zap_caches_locked(struct inode *inode) 222 { 223 struct nfs_inode *nfsi = NFS_I(inode); 224 int mode = inode->i_mode; 225 226 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 227 228 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 229 nfsi->attrtimeo_timestamp = jiffies; 230 231 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); 232 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 233 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 234 | NFS_INO_INVALID_DATA 235 | NFS_INO_INVALID_ACCESS 236 | NFS_INO_INVALID_ACL 237 | NFS_INO_REVAL_PAGECACHE); 238 } else 239 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 240 | NFS_INO_INVALID_ACCESS 241 | NFS_INO_INVALID_ACL 242 | NFS_INO_REVAL_PAGECACHE); 243 nfs_zap_label_cache_locked(nfsi); 244 } 245 246 void nfs_zap_caches(struct inode *inode) 247 { 248 spin_lock(&inode->i_lock); 249 nfs_zap_caches_locked(inode); 250 spin_unlock(&inode->i_lock); 251 } 252 253 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 254 { 255 if (mapping->nrpages != 0) { 256 spin_lock(&inode->i_lock); 257 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 258 spin_unlock(&inode->i_lock); 259 } 260 } 261 262 void nfs_zap_acl_cache(struct inode *inode) 263 { 264 void (*clear_acl_cache)(struct inode *); 265 266 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 267 if (clear_acl_cache != NULL) 268 clear_acl_cache(inode); 269 spin_lock(&inode->i_lock); 270 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 271 spin_unlock(&inode->i_lock); 272 } 273 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 274 275 void nfs_invalidate_atime(struct inode *inode) 276 { 277 spin_lock(&inode->i_lock); 278 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 279 spin_unlock(&inode->i_lock); 280 } 281 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 282 283 /* 284 * Invalidate, but do not unhash, the inode. 285 * NB: must be called with inode->i_lock held! 286 */ 287 static void nfs_invalidate_inode(struct inode *inode) 288 { 289 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 290 nfs_zap_caches_locked(inode); 291 } 292 293 struct nfs_find_desc { 294 struct nfs_fh *fh; 295 struct nfs_fattr *fattr; 296 }; 297 298 /* 299 * In NFSv3 we can have 64bit inode numbers. In order to support 300 * this, and re-exported directories (also seen in NFSv2) 301 * we are forced to allow 2 different inodes to have the same 302 * i_ino. 303 */ 304 static int 305 nfs_find_actor(struct inode *inode, void *opaque) 306 { 307 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 308 struct nfs_fh *fh = desc->fh; 309 struct nfs_fattr *fattr = desc->fattr; 310 311 if (NFS_FILEID(inode) != fattr->fileid) 312 return 0; 313 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 314 return 0; 315 if (nfs_compare_fh(NFS_FH(inode), fh)) 316 return 0; 317 if (is_bad_inode(inode) || NFS_STALE(inode)) 318 return 0; 319 return 1; 320 } 321 322 static int 323 nfs_init_locked(struct inode *inode, void *opaque) 324 { 325 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 326 struct nfs_fattr *fattr = desc->fattr; 327 328 set_nfs_fileid(inode, fattr->fileid); 329 inode->i_mode = fattr->mode; 330 nfs_copy_fh(NFS_FH(inode), desc->fh); 331 return 0; 332 } 333 334 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 335 static void nfs_clear_label_invalid(struct inode *inode) 336 { 337 spin_lock(&inode->i_lock); 338 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 339 spin_unlock(&inode->i_lock); 340 } 341 342 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 343 struct nfs4_label *label) 344 { 345 int error; 346 347 if (label == NULL) 348 return; 349 350 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 351 error = security_inode_notifysecctx(inode, label->label, 352 label->len); 353 if (error) 354 printk(KERN_ERR "%s() %s %d " 355 "security_inode_notifysecctx() %d\n", 356 __func__, 357 (char *)label->label, 358 label->len, error); 359 nfs_clear_label_invalid(inode); 360 } 361 } 362 363 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 364 { 365 struct nfs4_label *label = NULL; 366 int minor_version = server->nfs_client->cl_minorversion; 367 368 if (minor_version < 2) 369 return label; 370 371 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 372 return label; 373 374 label = kzalloc(sizeof(struct nfs4_label), flags); 375 if (label == NULL) 376 return ERR_PTR(-ENOMEM); 377 378 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 379 if (label->label == NULL) { 380 kfree(label); 381 return ERR_PTR(-ENOMEM); 382 } 383 label->len = NFS4_MAXLABELLEN; 384 385 return label; 386 } 387 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 388 #else 389 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 390 struct nfs4_label *label) 391 { 392 } 393 #endif 394 EXPORT_SYMBOL_GPL(nfs_setsecurity); 395 396 /* Search for inode identified by fh, fileid and i_mode in inode cache. */ 397 struct inode * 398 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) 399 { 400 struct nfs_find_desc desc = { 401 .fh = fh, 402 .fattr = fattr, 403 }; 404 struct inode *inode; 405 unsigned long hash; 406 407 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || 408 !(fattr->valid & NFS_ATTR_FATTR_TYPE)) 409 return NULL; 410 411 hash = nfs_fattr_to_ino_t(fattr); 412 inode = ilookup5(sb, hash, nfs_find_actor, &desc); 413 414 dprintk("%s: returning %p\n", __func__, inode); 415 return inode; 416 } 417 418 /* 419 * This is our front-end to iget that looks up inodes by file handle 420 * instead of inode number. 421 */ 422 struct inode * 423 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label) 424 { 425 struct nfs_find_desc desc = { 426 .fh = fh, 427 .fattr = fattr 428 }; 429 struct inode *inode = ERR_PTR(-ENOENT); 430 unsigned long hash; 431 432 nfs_attr_check_mountpoint(sb, fattr); 433 434 if (nfs_attr_use_mounted_on_fileid(fattr)) 435 fattr->fileid = fattr->mounted_on_fileid; 436 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 437 goto out_no_inode; 438 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 439 goto out_no_inode; 440 441 hash = nfs_fattr_to_ino_t(fattr); 442 443 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 444 if (inode == NULL) { 445 inode = ERR_PTR(-ENOMEM); 446 goto out_no_inode; 447 } 448 449 if (inode->i_state & I_NEW) { 450 struct nfs_inode *nfsi = NFS_I(inode); 451 unsigned long now = jiffies; 452 453 /* We set i_ino for the few things that still rely on it, 454 * such as stat(2) */ 455 inode->i_ino = hash; 456 457 /* We can't support update_atime(), since the server will reset it */ 458 inode->i_flags |= S_NOATIME|S_NOCMTIME; 459 inode->i_mode = fattr->mode; 460 nfsi->cache_validity = 0; 461 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 462 && nfs_server_capable(inode, NFS_CAP_MODE)) 463 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 464 /* Why so? Because we want revalidate for devices/FIFOs, and 465 * that's precisely what we have in nfs_file_inode_operations. 466 */ 467 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 468 if (S_ISREG(inode->i_mode)) { 469 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 470 inode->i_data.a_ops = &nfs_file_aops; 471 } else if (S_ISDIR(inode->i_mode)) { 472 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 473 inode->i_fop = &nfs_dir_operations; 474 inode->i_data.a_ops = &nfs_dir_aops; 475 /* Deal with crossing mountpoints */ 476 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 477 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 478 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 479 inode->i_op = &nfs_referral_inode_operations; 480 else 481 inode->i_op = &nfs_mountpoint_inode_operations; 482 inode->i_fop = NULL; 483 inode->i_flags |= S_AUTOMOUNT; 484 } 485 } else if (S_ISLNK(inode->i_mode)) { 486 inode->i_op = &nfs_symlink_inode_operations; 487 inode_nohighmem(inode); 488 } else 489 init_special_inode(inode, inode->i_mode, fattr->rdev); 490 491 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 492 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 493 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 494 inode_set_iversion_raw(inode, 0); 495 inode->i_size = 0; 496 clear_nlink(inode); 497 inode->i_uid = make_kuid(&init_user_ns, -2); 498 inode->i_gid = make_kgid(&init_user_ns, -2); 499 inode->i_blocks = 0; 500 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 501 nfsi->write_io = 0; 502 nfsi->read_io = 0; 503 504 nfsi->read_cache_jiffies = fattr->time_start; 505 nfsi->attr_gencount = fattr->gencount; 506 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 507 inode->i_atime = timespec_to_timespec64(fattr->atime); 508 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 510 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 511 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 512 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 514 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 515 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 516 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 517 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); 518 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 519 inode_set_iversion_raw(inode, fattr->change_attr); 520 else 521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); 522 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 523 inode->i_size = nfs_size_to_loff_t(fattr->size); 524 else 525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); 526 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 527 set_nlink(inode, fattr->nlink); 528 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 530 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 531 inode->i_uid = fattr->uid; 532 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 534 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 535 inode->i_gid = fattr->gid; 536 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); 538 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 539 inode->i_blocks = fattr->du.nfs2.blocks; 540 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 541 /* 542 * report the blocks in 512byte units 543 */ 544 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 545 } 546 547 if (nfsi->cache_validity != 0) 548 nfsi->cache_validity |= NFS_INO_REVAL_FORCED; 549 550 nfs_setsecurity(inode, fattr, label); 551 552 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 553 nfsi->attrtimeo_timestamp = now; 554 nfsi->access_cache = RB_ROOT; 555 556 nfs_fscache_init_inode(inode); 557 558 unlock_new_inode(inode); 559 } else { 560 int err = nfs_refresh_inode(inode, fattr); 561 if (err < 0) { 562 iput(inode); 563 inode = ERR_PTR(err); 564 goto out_no_inode; 565 } 566 } 567 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 568 inode->i_sb->s_id, 569 (unsigned long long)NFS_FILEID(inode), 570 nfs_display_fhandle_hash(fh), 571 atomic_read(&inode->i_count)); 572 573 out: 574 return inode; 575 576 out_no_inode: 577 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 578 goto out; 579 } 580 EXPORT_SYMBOL_GPL(nfs_fhget); 581 582 #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) 583 584 int 585 nfs_setattr(struct dentry *dentry, struct iattr *attr) 586 { 587 struct inode *inode = d_inode(dentry); 588 struct nfs_fattr *fattr; 589 int error = 0; 590 591 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 592 593 /* skip mode change if it's just for clearing setuid/setgid */ 594 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 595 attr->ia_valid &= ~ATTR_MODE; 596 597 if (attr->ia_valid & ATTR_SIZE) { 598 BUG_ON(!S_ISREG(inode->i_mode)); 599 600 error = inode_newsize_ok(inode, attr->ia_size); 601 if (error) 602 return error; 603 604 if (attr->ia_size == i_size_read(inode)) 605 attr->ia_valid &= ~ATTR_SIZE; 606 } 607 608 /* Optimization: if the end result is no change, don't RPC */ 609 attr->ia_valid &= NFS_VALID_ATTRS; 610 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 611 return 0; 612 613 trace_nfs_setattr_enter(inode); 614 615 /* Write all dirty data */ 616 if (S_ISREG(inode->i_mode)) 617 nfs_sync_inode(inode); 618 619 fattr = nfs_alloc_fattr(); 620 if (fattr == NULL) { 621 error = -ENOMEM; 622 goto out; 623 } 624 625 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 626 if (error == 0) 627 error = nfs_refresh_inode(inode, fattr); 628 nfs_free_fattr(fattr); 629 out: 630 trace_nfs_setattr_exit(inode, error); 631 return error; 632 } 633 EXPORT_SYMBOL_GPL(nfs_setattr); 634 635 /** 636 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 637 * @inode: inode of the file used 638 * @offset: file offset to start truncating 639 * 640 * This is a copy of the common vmtruncate, but with the locking 641 * corrected to take into account the fact that NFS requires 642 * inode->i_size to be updated under the inode->i_lock. 643 * Note: must be called with inode->i_lock held! 644 */ 645 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 646 { 647 int err; 648 649 err = inode_newsize_ok(inode, offset); 650 if (err) 651 goto out; 652 653 i_size_write(inode, offset); 654 /* Optimisation */ 655 if (offset == 0) 656 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA | 657 NFS_INO_DATA_INVAL_DEFER); 658 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; 659 660 spin_unlock(&inode->i_lock); 661 truncate_pagecache(inode, offset); 662 spin_lock(&inode->i_lock); 663 out: 664 return err; 665 } 666 667 /** 668 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 669 * @inode: pointer to struct inode 670 * @attr: pointer to struct iattr 671 * @fattr: pointer to struct nfs_fattr 672 * 673 * Note: we do this in the *proc.c in order to ensure that 674 * it works for things like exclusive creates too. 675 */ 676 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 677 struct nfs_fattr *fattr) 678 { 679 /* Barrier: bump the attribute generation count. */ 680 nfs_fattr_set_barrier(fattr); 681 682 spin_lock(&inode->i_lock); 683 NFS_I(inode)->attr_gencount = fattr->gencount; 684 if ((attr->ia_valid & ATTR_SIZE) != 0) { 685 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 686 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 687 nfs_vmtruncate(inode, attr->ia_size); 688 } 689 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 690 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; 691 if ((attr->ia_valid & ATTR_MODE) != 0) { 692 int mode = attr->ia_mode & S_IALLUGO; 693 mode |= inode->i_mode & ~S_IALLUGO; 694 inode->i_mode = mode; 695 } 696 if ((attr->ia_valid & ATTR_UID) != 0) 697 inode->i_uid = attr->ia_uid; 698 if ((attr->ia_valid & ATTR_GID) != 0) 699 inode->i_gid = attr->ia_gid; 700 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 701 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 702 else 703 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 704 | NFS_INO_INVALID_CTIME); 705 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 706 | NFS_INO_INVALID_ACL); 707 } 708 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { 709 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME 710 | NFS_INO_INVALID_CTIME); 711 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 712 inode->i_atime = timespec_to_timespec64(fattr->atime); 713 else if (attr->ia_valid & ATTR_ATIME_SET) 714 inode->i_atime = attr->ia_atime; 715 else 716 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 717 718 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 719 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 720 else 721 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 722 | NFS_INO_INVALID_CTIME); 723 } 724 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { 725 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME 726 | NFS_INO_INVALID_CTIME); 727 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 728 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 729 else if (attr->ia_valid & ATTR_MTIME_SET) 730 inode->i_mtime = attr->ia_mtime; 731 else 732 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); 733 734 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 735 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 736 else 737 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE 738 | NFS_INO_INVALID_CTIME); 739 } 740 if (fattr->valid) 741 nfs_update_inode(inode, fattr); 742 spin_unlock(&inode->i_lock); 743 } 744 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 745 746 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) 747 { 748 struct dentry *parent; 749 750 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 751 return; 752 parent = dget_parent(dentry); 753 nfs_force_use_readdirplus(d_inode(parent)); 754 dput(parent); 755 } 756 757 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) 758 { 759 struct dentry *parent; 760 761 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 762 return; 763 parent = dget_parent(dentry); 764 nfs_advise_use_readdirplus(d_inode(parent)); 765 dput(parent); 766 } 767 768 static bool nfs_need_revalidate_inode(struct inode *inode) 769 { 770 if (NFS_I(inode)->cache_validity & 771 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 772 return true; 773 if (nfs_attribute_cache_expired(inode)) 774 return true; 775 return false; 776 } 777 778 int nfs_getattr(const struct path *path, struct kstat *stat, 779 u32 request_mask, unsigned int query_flags) 780 { 781 struct inode *inode = d_inode(path->dentry); 782 struct nfs_server *server = NFS_SERVER(inode); 783 unsigned long cache_validity; 784 int err = 0; 785 bool force_sync = query_flags & AT_STATX_FORCE_SYNC; 786 bool do_update = false; 787 788 trace_nfs_getattr_enter(inode); 789 790 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) 791 goto out_no_update; 792 793 /* Flush out writes to the server in order to update c/mtime. */ 794 if ((request_mask & (STATX_CTIME|STATX_MTIME)) && 795 S_ISREG(inode->i_mode)) { 796 err = filemap_write_and_wait(inode->i_mapping); 797 if (err) 798 goto out; 799 } 800 801 /* 802 * We may force a getattr if the user cares about atime. 803 * 804 * Note that we only have to check the vfsmount flags here: 805 * - NFS always sets S_NOATIME by so checking it would give a 806 * bogus result 807 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is 808 * no point in checking those. 809 */ 810 if ((path->mnt->mnt_flags & MNT_NOATIME) || 811 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 812 request_mask &= ~STATX_ATIME; 813 814 /* Is the user requesting attributes that might need revalidation? */ 815 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| 816 STATX_MTIME|STATX_UID|STATX_GID| 817 STATX_SIZE|STATX_BLOCKS))) 818 goto out_no_revalidate; 819 820 /* Check whether the cached attributes are stale */ 821 do_update |= force_sync || nfs_attribute_cache_expired(inode); 822 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); 823 do_update |= cache_validity & 824 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL); 825 if (request_mask & STATX_ATIME) 826 do_update |= cache_validity & NFS_INO_INVALID_ATIME; 827 if (request_mask & (STATX_CTIME|STATX_MTIME)) 828 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE; 829 if (do_update) { 830 /* Update the attribute cache */ 831 if (!(server->flags & NFS_MOUNT_NOAC)) 832 nfs_readdirplus_parent_cache_miss(path->dentry); 833 else 834 nfs_readdirplus_parent_cache_hit(path->dentry); 835 err = __nfs_revalidate_inode(server, inode); 836 if (err) 837 goto out; 838 } else 839 nfs_readdirplus_parent_cache_hit(path->dentry); 840 out_no_revalidate: 841 /* Only return attributes that were revalidated. */ 842 stat->result_mask &= request_mask; 843 out_no_update: 844 generic_fillattr(inode, stat); 845 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 846 if (S_ISDIR(inode->i_mode)) 847 stat->blksize = NFS_SERVER(inode)->dtsize; 848 out: 849 trace_nfs_getattr_exit(inode, err); 850 return err; 851 } 852 EXPORT_SYMBOL_GPL(nfs_getattr); 853 854 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 855 { 856 refcount_set(&l_ctx->count, 1); 857 l_ctx->lockowner = current->files; 858 INIT_LIST_HEAD(&l_ctx->list); 859 atomic_set(&l_ctx->io_count, 0); 860 } 861 862 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 863 { 864 struct nfs_lock_context *pos; 865 866 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { 867 if (pos->lockowner != current->files) 868 continue; 869 if (refcount_inc_not_zero(&pos->count)) 870 return pos; 871 } 872 return NULL; 873 } 874 875 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 876 { 877 struct nfs_lock_context *res, *new = NULL; 878 struct inode *inode = d_inode(ctx->dentry); 879 880 rcu_read_lock(); 881 res = __nfs_find_lock_context(ctx); 882 rcu_read_unlock(); 883 if (res == NULL) { 884 new = kmalloc(sizeof(*new), GFP_KERNEL); 885 if (new == NULL) 886 return ERR_PTR(-ENOMEM); 887 nfs_init_lock_context(new); 888 spin_lock(&inode->i_lock); 889 res = __nfs_find_lock_context(ctx); 890 if (res == NULL) { 891 new->open_context = get_nfs_open_context(ctx); 892 if (new->open_context) { 893 list_add_tail_rcu(&new->list, 894 &ctx->lock_context.list); 895 res = new; 896 new = NULL; 897 } else 898 res = ERR_PTR(-EBADF); 899 } 900 spin_unlock(&inode->i_lock); 901 kfree(new); 902 } 903 return res; 904 } 905 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 906 907 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 908 { 909 struct nfs_open_context *ctx = l_ctx->open_context; 910 struct inode *inode = d_inode(ctx->dentry); 911 912 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) 913 return; 914 list_del_rcu(&l_ctx->list); 915 spin_unlock(&inode->i_lock); 916 put_nfs_open_context(ctx); 917 kfree_rcu(l_ctx, rcu_head); 918 } 919 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 920 921 /** 922 * nfs_close_context - Common close_context() routine NFSv2/v3 923 * @ctx: pointer to context 924 * @is_sync: is this a synchronous close 925 * 926 * Ensure that the attributes are up to date if we're mounted 927 * with close-to-open semantics and we have cached data that will 928 * need to be revalidated on open. 929 */ 930 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 931 { 932 struct nfs_inode *nfsi; 933 struct inode *inode; 934 struct nfs_server *server; 935 936 if (!(ctx->mode & FMODE_WRITE)) 937 return; 938 if (!is_sync) 939 return; 940 inode = d_inode(ctx->dentry); 941 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 942 return; 943 nfsi = NFS_I(inode); 944 if (inode->i_mapping->nrpages == 0) 945 return; 946 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 947 return; 948 if (!list_empty(&nfsi->open_files)) 949 return; 950 server = NFS_SERVER(inode); 951 if (server->flags & NFS_MOUNT_NOCTO) 952 return; 953 nfs_revalidate_inode(server, inode); 954 } 955 EXPORT_SYMBOL_GPL(nfs_close_context); 956 957 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 958 fmode_t f_mode, 959 struct file *filp) 960 { 961 struct nfs_open_context *ctx; 962 const struct cred *cred = get_current_cred(); 963 964 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 965 if (!ctx) { 966 put_cred(cred); 967 return ERR_PTR(-ENOMEM); 968 } 969 nfs_sb_active(dentry->d_sb); 970 ctx->dentry = dget(dentry); 971 ctx->cred = cred; 972 ctx->ll_cred = NULL; 973 ctx->state = NULL; 974 ctx->mode = f_mode; 975 ctx->flags = 0; 976 ctx->error = 0; 977 ctx->flock_owner = (fl_owner_t)filp; 978 nfs_init_lock_context(&ctx->lock_context); 979 ctx->lock_context.open_context = ctx; 980 INIT_LIST_HEAD(&ctx->list); 981 ctx->mdsthreshold = NULL; 982 return ctx; 983 } 984 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 985 986 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 987 { 988 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) 989 return ctx; 990 return NULL; 991 } 992 EXPORT_SYMBOL_GPL(get_nfs_open_context); 993 994 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 995 { 996 struct inode *inode = d_inode(ctx->dentry); 997 struct super_block *sb = ctx->dentry->d_sb; 998 999 if (!refcount_dec_and_test(&ctx->lock_context.count)) 1000 return; 1001 if (!list_empty(&ctx->list)) { 1002 spin_lock(&inode->i_lock); 1003 list_del_rcu(&ctx->list); 1004 spin_unlock(&inode->i_lock); 1005 } 1006 if (inode != NULL) 1007 NFS_PROTO(inode)->close_context(ctx, is_sync); 1008 put_cred(ctx->cred); 1009 dput(ctx->dentry); 1010 nfs_sb_deactive(sb); 1011 put_rpccred(ctx->ll_cred); 1012 kfree(ctx->mdsthreshold); 1013 kfree_rcu(ctx, rcu_head); 1014 } 1015 1016 void put_nfs_open_context(struct nfs_open_context *ctx) 1017 { 1018 __put_nfs_open_context(ctx, 0); 1019 } 1020 EXPORT_SYMBOL_GPL(put_nfs_open_context); 1021 1022 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 1023 { 1024 __put_nfs_open_context(ctx, 1); 1025 } 1026 1027 /* 1028 * Ensure that mmap has a recent RPC credential for use when writing out 1029 * shared pages 1030 */ 1031 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 1032 { 1033 struct inode *inode = d_inode(ctx->dentry); 1034 struct nfs_inode *nfsi = NFS_I(inode); 1035 1036 spin_lock(&inode->i_lock); 1037 if (list_empty(&nfsi->open_files) && 1038 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) 1039 nfsi->cache_validity |= NFS_INO_INVALID_DATA | 1040 NFS_INO_REVAL_FORCED; 1041 list_add_tail_rcu(&ctx->list, &nfsi->open_files); 1042 spin_unlock(&inode->i_lock); 1043 } 1044 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 1045 1046 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 1047 { 1048 filp->private_data = get_nfs_open_context(ctx); 1049 if (list_empty(&ctx->list)) 1050 nfs_inode_attach_open_context(ctx); 1051 } 1052 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 1053 1054 /* 1055 * Given an inode, search for an open context with the desired characteristics 1056 */ 1057 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) 1058 { 1059 struct nfs_inode *nfsi = NFS_I(inode); 1060 struct nfs_open_context *pos, *ctx = NULL; 1061 1062 rcu_read_lock(); 1063 list_for_each_entry_rcu(pos, &nfsi->open_files, list) { 1064 if (cred != NULL && pos->cred != cred) 1065 continue; 1066 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 1067 continue; 1068 ctx = get_nfs_open_context(pos); 1069 if (ctx) 1070 break; 1071 } 1072 rcu_read_unlock(); 1073 return ctx; 1074 } 1075 1076 void nfs_file_clear_open_context(struct file *filp) 1077 { 1078 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1079 1080 if (ctx) { 1081 struct inode *inode = d_inode(ctx->dentry); 1082 1083 /* 1084 * We fatal error on write before. Try to writeback 1085 * every page again. 1086 */ 1087 if (ctx->error < 0) 1088 invalidate_inode_pages2(inode->i_mapping); 1089 filp->private_data = NULL; 1090 put_nfs_open_context_sync(ctx); 1091 } 1092 } 1093 1094 /* 1095 * These allocate and release file read/write context information. 1096 */ 1097 int nfs_open(struct inode *inode, struct file *filp) 1098 { 1099 struct nfs_open_context *ctx; 1100 1101 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); 1102 if (IS_ERR(ctx)) 1103 return PTR_ERR(ctx); 1104 nfs_file_set_open_context(filp, ctx); 1105 put_nfs_open_context(ctx); 1106 nfs_fscache_open_file(inode, filp); 1107 return 0; 1108 } 1109 EXPORT_SYMBOL_GPL(nfs_open); 1110 1111 /* 1112 * This function is called whenever some part of NFS notices that 1113 * the cached attributes have to be refreshed. 1114 */ 1115 int 1116 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1117 { 1118 int status = -ESTALE; 1119 struct nfs4_label *label = NULL; 1120 struct nfs_fattr *fattr = NULL; 1121 struct nfs_inode *nfsi = NFS_I(inode); 1122 1123 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1124 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1125 1126 trace_nfs_revalidate_inode_enter(inode); 1127 1128 if (is_bad_inode(inode)) 1129 goto out; 1130 if (NFS_STALE(inode)) 1131 goto out; 1132 1133 /* pNFS: Attributes aren't updated until we layoutcommit */ 1134 if (S_ISREG(inode->i_mode)) { 1135 status = pnfs_sync_inode(inode, false); 1136 if (status) 1137 goto out; 1138 } 1139 1140 status = -ENOMEM; 1141 fattr = nfs_alloc_fattr(); 1142 if (fattr == NULL) 1143 goto out; 1144 1145 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1146 1147 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 1148 if (IS_ERR(label)) { 1149 status = PTR_ERR(label); 1150 goto out; 1151 } 1152 1153 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, 1154 label, inode); 1155 if (status != 0) { 1156 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1157 inode->i_sb->s_id, 1158 (unsigned long long)NFS_FILEID(inode), status); 1159 if (status == -ESTALE) { 1160 nfs_zap_caches(inode); 1161 if (!S_ISDIR(inode->i_mode)) 1162 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 1163 } 1164 goto err_out; 1165 } 1166 1167 status = nfs_refresh_inode(inode, fattr); 1168 if (status) { 1169 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1170 inode->i_sb->s_id, 1171 (unsigned long long)NFS_FILEID(inode), status); 1172 goto err_out; 1173 } 1174 1175 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1176 nfs_zap_acl_cache(inode); 1177 1178 nfs_setsecurity(inode, fattr, label); 1179 1180 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1181 inode->i_sb->s_id, 1182 (unsigned long long)NFS_FILEID(inode)); 1183 1184 err_out: 1185 nfs4_label_free(label); 1186 out: 1187 nfs_free_fattr(fattr); 1188 trace_nfs_revalidate_inode_exit(inode, status); 1189 return status; 1190 } 1191 1192 int nfs_attribute_cache_expired(struct inode *inode) 1193 { 1194 if (nfs_have_delegated_attributes(inode)) 1195 return 0; 1196 return nfs_attribute_timeout(inode); 1197 } 1198 1199 /** 1200 * nfs_revalidate_inode - Revalidate the inode attributes 1201 * @server: pointer to nfs_server struct 1202 * @inode: pointer to inode struct 1203 * 1204 * Updates inode attribute information by retrieving the data from the server. 1205 */ 1206 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1207 { 1208 if (!nfs_need_revalidate_inode(inode)) 1209 return NFS_STALE(inode) ? -ESTALE : 0; 1210 return __nfs_revalidate_inode(server, inode); 1211 } 1212 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1213 1214 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1215 { 1216 struct nfs_inode *nfsi = NFS_I(inode); 1217 int ret; 1218 1219 if (mapping->nrpages != 0) { 1220 if (S_ISREG(inode->i_mode)) { 1221 ret = nfs_sync_mapping(mapping); 1222 if (ret < 0) 1223 return ret; 1224 } 1225 ret = invalidate_inode_pages2(mapping); 1226 if (ret < 0) 1227 return ret; 1228 } 1229 if (S_ISDIR(inode->i_mode)) { 1230 spin_lock(&inode->i_lock); 1231 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1232 spin_unlock(&inode->i_lock); 1233 } 1234 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1235 nfs_fscache_wait_on_invalidate(inode); 1236 1237 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1238 inode->i_sb->s_id, 1239 (unsigned long long)NFS_FILEID(inode)); 1240 return 0; 1241 } 1242 1243 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1244 { 1245 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) || 1246 NFS_STALE(inode); 1247 } 1248 1249 int nfs_revalidate_mapping_rcu(struct inode *inode) 1250 { 1251 struct nfs_inode *nfsi = NFS_I(inode); 1252 unsigned long *bitlock = &nfsi->flags; 1253 int ret = 0; 1254 1255 if (IS_SWAPFILE(inode)) 1256 goto out; 1257 if (nfs_mapping_need_revalidate_inode(inode)) { 1258 ret = -ECHILD; 1259 goto out; 1260 } 1261 spin_lock(&inode->i_lock); 1262 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1263 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1264 ret = -ECHILD; 1265 spin_unlock(&inode->i_lock); 1266 out: 1267 return ret; 1268 } 1269 1270 /** 1271 * nfs_revalidate_mapping - Revalidate the pagecache 1272 * @inode: pointer to host inode 1273 * @mapping: pointer to mapping 1274 */ 1275 int nfs_revalidate_mapping(struct inode *inode, 1276 struct address_space *mapping) 1277 { 1278 struct nfs_inode *nfsi = NFS_I(inode); 1279 unsigned long *bitlock = &nfsi->flags; 1280 int ret = 0; 1281 1282 /* swapfiles are not supposed to be shared. */ 1283 if (IS_SWAPFILE(inode)) 1284 goto out; 1285 1286 if (nfs_mapping_need_revalidate_inode(inode)) { 1287 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1288 if (ret < 0) 1289 goto out; 1290 } 1291 1292 /* 1293 * We must clear NFS_INO_INVALID_DATA first to ensure that 1294 * invalidations that come in while we're shooting down the mappings 1295 * are respected. But, that leaves a race window where one revalidator 1296 * can clear the flag, and then another checks it before the mapping 1297 * gets invalidated. Fix that by serializing access to this part of 1298 * the function. 1299 * 1300 * At the same time, we need to allow other tasks to see whether we 1301 * might be in the middle of invalidating the pages, so we only set 1302 * the bit lock here if it looks like we're going to be doing that. 1303 */ 1304 for (;;) { 1305 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1306 nfs_wait_bit_killable, TASK_KILLABLE); 1307 if (ret) 1308 goto out; 1309 spin_lock(&inode->i_lock); 1310 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1311 spin_unlock(&inode->i_lock); 1312 continue; 1313 } 1314 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1315 break; 1316 spin_unlock(&inode->i_lock); 1317 goto out; 1318 } 1319 1320 set_bit(NFS_INO_INVALIDATING, bitlock); 1321 smp_wmb(); 1322 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA| 1323 NFS_INO_DATA_INVAL_DEFER); 1324 spin_unlock(&inode->i_lock); 1325 trace_nfs_invalidate_mapping_enter(inode); 1326 ret = nfs_invalidate_mapping(inode, mapping); 1327 trace_nfs_invalidate_mapping_exit(inode, ret); 1328 1329 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1330 smp_mb__after_atomic(); 1331 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1332 out: 1333 return ret; 1334 } 1335 1336 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1337 { 1338 struct inode *inode = &nfsi->vfs_inode; 1339 1340 if (!S_ISREG(inode->i_mode)) 1341 return false; 1342 if (list_empty(&nfsi->open_files)) 1343 return false; 1344 return inode_is_open_for_write(inode); 1345 } 1346 1347 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1348 { 1349 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1350 } 1351 1352 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1353 { 1354 struct timespec ts; 1355 1356 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1357 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1358 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { 1359 inode_set_iversion_raw(inode, fattr->change_attr); 1360 if (S_ISDIR(inode->i_mode)) 1361 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1362 } 1363 /* If we have atomic WCC data, we may update some attributes */ 1364 ts = timespec64_to_timespec(inode->i_ctime); 1365 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1366 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1367 && timespec_equal(&ts, &fattr->pre_ctime)) { 1368 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 1369 } 1370 1371 ts = timespec64_to_timespec(inode->i_mtime); 1372 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1373 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1374 && timespec_equal(&ts, &fattr->pre_mtime)) { 1375 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 1376 if (S_ISDIR(inode->i_mode)) 1377 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1378 } 1379 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1380 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1381 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1382 && !nfs_have_writebacks(inode)) { 1383 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1384 } 1385 } 1386 1387 /** 1388 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1389 * @inode: pointer to inode 1390 * @fattr: updated attributes 1391 * 1392 * Verifies the attribute cache. If we have just changed the attributes, 1393 * so that fattr carries weak cache consistency data, then it may 1394 * also update the ctime/mtime/change_attribute. 1395 */ 1396 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1397 { 1398 struct nfs_inode *nfsi = NFS_I(inode); 1399 loff_t cur_size, new_isize; 1400 unsigned long invalid = 0; 1401 struct timespec ts; 1402 1403 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1404 return 0; 1405 1406 /* No fileid? Just exit */ 1407 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) 1408 return 0; 1409 /* Has the inode gone and changed behind our back? */ 1410 if (nfsi->fileid != fattr->fileid) { 1411 /* Is this perhaps the mounted-on fileid? */ 1412 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 1413 nfsi->fileid == fattr->mounted_on_fileid) 1414 return 0; 1415 return -ESTALE; 1416 } 1417 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1418 return -ESTALE; 1419 1420 1421 if (!nfs_file_has_buffered_writers(nfsi)) { 1422 /* Verify a few of the more important attributes */ 1423 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) 1424 invalid |= NFS_INO_INVALID_CHANGE 1425 | NFS_INO_REVAL_PAGECACHE; 1426 1427 ts = timespec64_to_timespec(inode->i_mtime); 1428 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime)) 1429 invalid |= NFS_INO_INVALID_MTIME; 1430 1431 ts = timespec64_to_timespec(inode->i_ctime); 1432 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime)) 1433 invalid |= NFS_INO_INVALID_CTIME; 1434 1435 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1436 cur_size = i_size_read(inode); 1437 new_isize = nfs_size_to_loff_t(fattr->size); 1438 if (cur_size != new_isize) 1439 invalid |= NFS_INO_INVALID_SIZE 1440 | NFS_INO_REVAL_PAGECACHE; 1441 } 1442 } 1443 1444 /* Have any file permissions changed? */ 1445 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1446 invalid |= NFS_INO_INVALID_ACCESS 1447 | NFS_INO_INVALID_ACL 1448 | NFS_INO_INVALID_OTHER; 1449 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1450 invalid |= NFS_INO_INVALID_ACCESS 1451 | NFS_INO_INVALID_ACL 1452 | NFS_INO_INVALID_OTHER; 1453 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1454 invalid |= NFS_INO_INVALID_ACCESS 1455 | NFS_INO_INVALID_ACL 1456 | NFS_INO_INVALID_OTHER; 1457 1458 /* Has the link count changed? */ 1459 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1460 invalid |= NFS_INO_INVALID_OTHER; 1461 1462 ts = timespec64_to_timespec(inode->i_atime); 1463 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime)) 1464 invalid |= NFS_INO_INVALID_ATIME; 1465 1466 if (invalid != 0) 1467 nfs_set_cache_invalid(inode, invalid); 1468 1469 nfsi->read_cache_jiffies = fattr->time_start; 1470 return 0; 1471 } 1472 1473 static atomic_long_t nfs_attr_generation_counter; 1474 1475 static unsigned long nfs_read_attr_generation_counter(void) 1476 { 1477 return atomic_long_read(&nfs_attr_generation_counter); 1478 } 1479 1480 unsigned long nfs_inc_attr_generation_counter(void) 1481 { 1482 return atomic_long_inc_return(&nfs_attr_generation_counter); 1483 } 1484 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1485 1486 void nfs_fattr_init(struct nfs_fattr *fattr) 1487 { 1488 fattr->valid = 0; 1489 fattr->time_start = jiffies; 1490 fattr->gencount = nfs_inc_attr_generation_counter(); 1491 fattr->owner_name = NULL; 1492 fattr->group_name = NULL; 1493 } 1494 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1495 1496 /** 1497 * nfs_fattr_set_barrier 1498 * @fattr: attributes 1499 * 1500 * Used to set a barrier after an attribute was updated. This 1501 * barrier ensures that older attributes from RPC calls that may 1502 * have raced with our update cannot clobber these new values. 1503 * Note that you are still responsible for ensuring that other 1504 * operations which change the attribute on the server do not 1505 * collide. 1506 */ 1507 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1508 { 1509 fattr->gencount = nfs_inc_attr_generation_counter(); 1510 } 1511 1512 struct nfs_fattr *nfs_alloc_fattr(void) 1513 { 1514 struct nfs_fattr *fattr; 1515 1516 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1517 if (fattr != NULL) 1518 nfs_fattr_init(fattr); 1519 return fattr; 1520 } 1521 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1522 1523 struct nfs_fh *nfs_alloc_fhandle(void) 1524 { 1525 struct nfs_fh *fh; 1526 1527 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1528 if (fh != NULL) 1529 fh->size = 0; 1530 return fh; 1531 } 1532 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1533 1534 #ifdef NFS_DEBUG 1535 /* 1536 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1537 * in the same way that wireshark does 1538 * 1539 * @fh: file handle 1540 * 1541 * For debugging only. 1542 */ 1543 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1544 { 1545 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1546 * not on the result */ 1547 return nfs_fhandle_hash(fh); 1548 } 1549 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1550 1551 /* 1552 * _nfs_display_fhandle - display an NFS file handle on the console 1553 * 1554 * @fh: file handle to display 1555 * @caption: display caption 1556 * 1557 * For debugging only. 1558 */ 1559 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1560 { 1561 unsigned short i; 1562 1563 if (fh == NULL || fh->size == 0) { 1564 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1565 return; 1566 } 1567 1568 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1569 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1570 for (i = 0; i < fh->size; i += 16) { 1571 __be32 *pos = (__be32 *)&fh->data[i]; 1572 1573 switch ((fh->size - i - 1) >> 2) { 1574 case 0: 1575 printk(KERN_DEFAULT " %08x\n", 1576 be32_to_cpup(pos)); 1577 break; 1578 case 1: 1579 printk(KERN_DEFAULT " %08x %08x\n", 1580 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1581 break; 1582 case 2: 1583 printk(KERN_DEFAULT " %08x %08x %08x\n", 1584 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1585 be32_to_cpup(pos + 2)); 1586 break; 1587 default: 1588 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1589 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1590 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1591 } 1592 } 1593 } 1594 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1595 #endif 1596 1597 /** 1598 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1599 * @inode: pointer to inode 1600 * @fattr: attributes 1601 * 1602 * Attempt to divine whether or not an RPC call reply carrying stale 1603 * attributes got scheduled after another call carrying updated ones. 1604 * 1605 * To do so, the function first assumes that a more recent ctime means 1606 * that the attributes in fattr are newer, however it also attempt to 1607 * catch the case where ctime either didn't change, or went backwards 1608 * (if someone reset the clock on the server) by looking at whether 1609 * or not this RPC call was started after the inode was last updated. 1610 * Note also the check for wraparound of 'attr_gencount' 1611 * 1612 * The function returns 'true' if it thinks the attributes in 'fattr' are 1613 * more recent than the ones cached in the inode. 1614 * 1615 */ 1616 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1617 { 1618 const struct nfs_inode *nfsi = NFS_I(inode); 1619 1620 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1621 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1622 } 1623 1624 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1625 { 1626 int ret; 1627 1628 trace_nfs_refresh_inode_enter(inode); 1629 1630 if (nfs_inode_attrs_need_update(inode, fattr)) 1631 ret = nfs_update_inode(inode, fattr); 1632 else 1633 ret = nfs_check_inode_attributes(inode, fattr); 1634 1635 trace_nfs_refresh_inode_exit(inode, ret); 1636 return ret; 1637 } 1638 1639 /** 1640 * nfs_refresh_inode - try to update the inode attribute cache 1641 * @inode: pointer to inode 1642 * @fattr: updated attributes 1643 * 1644 * Check that an RPC call that returned attributes has not overlapped with 1645 * other recent updates of the inode metadata, then decide whether it is 1646 * safe to do a full update of the inode attributes, or whether just to 1647 * call nfs_check_inode_attributes. 1648 */ 1649 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1650 { 1651 int status; 1652 1653 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1654 return 0; 1655 spin_lock(&inode->i_lock); 1656 status = nfs_refresh_inode_locked(inode, fattr); 1657 spin_unlock(&inode->i_lock); 1658 1659 return status; 1660 } 1661 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1662 1663 static int nfs_post_op_update_inode_locked(struct inode *inode, 1664 struct nfs_fattr *fattr, unsigned int invalid) 1665 { 1666 if (S_ISDIR(inode->i_mode)) 1667 invalid |= NFS_INO_INVALID_DATA; 1668 nfs_set_cache_invalid(inode, invalid); 1669 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1670 return 0; 1671 return nfs_refresh_inode_locked(inode, fattr); 1672 } 1673 1674 /** 1675 * nfs_post_op_update_inode - try to update the inode attribute cache 1676 * @inode: pointer to inode 1677 * @fattr: updated attributes 1678 * 1679 * After an operation that has changed the inode metadata, mark the 1680 * attribute cache as being invalid, then try to update it. 1681 * 1682 * NB: if the server didn't return any post op attributes, this 1683 * function will force the retrieval of attributes before the next 1684 * NFS request. Thus it should be used only for operations that 1685 * are expected to change one or more attributes, to avoid 1686 * unnecessary NFS requests and trips through nfs_update_inode(). 1687 */ 1688 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1689 { 1690 int status; 1691 1692 spin_lock(&inode->i_lock); 1693 nfs_fattr_set_barrier(fattr); 1694 status = nfs_post_op_update_inode_locked(inode, fattr, 1695 NFS_INO_INVALID_CHANGE 1696 | NFS_INO_INVALID_CTIME 1697 | NFS_INO_REVAL_FORCED); 1698 spin_unlock(&inode->i_lock); 1699 1700 return status; 1701 } 1702 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1703 1704 /** 1705 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1706 * @inode: pointer to inode 1707 * @fattr: updated attributes 1708 * 1709 * After an operation that has changed the inode metadata, mark the 1710 * attribute cache as being invalid, then try to update it. Fake up 1711 * weak cache consistency data, if none exist. 1712 * 1713 * This function is mainly designed to be used by the ->write_done() functions. 1714 */ 1715 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1716 { 1717 int status; 1718 1719 /* Don't do a WCC update if these attributes are already stale */ 1720 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1721 !nfs_inode_attrs_need_update(inode, fattr)) { 1722 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1723 | NFS_ATTR_FATTR_PRESIZE 1724 | NFS_ATTR_FATTR_PREMTIME 1725 | NFS_ATTR_FATTR_PRECTIME); 1726 goto out_noforce; 1727 } 1728 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1729 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1730 fattr->pre_change_attr = inode_peek_iversion_raw(inode); 1731 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1732 } 1733 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1734 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1735 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime); 1736 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1737 } 1738 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1739 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1740 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime); 1741 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1742 } 1743 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1744 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1745 fattr->pre_size = i_size_read(inode); 1746 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1747 } 1748 out_noforce: 1749 status = nfs_post_op_update_inode_locked(inode, fattr, 1750 NFS_INO_INVALID_CHANGE 1751 | NFS_INO_INVALID_CTIME 1752 | NFS_INO_INVALID_MTIME); 1753 return status; 1754 } 1755 1756 /** 1757 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1758 * @inode: pointer to inode 1759 * @fattr: updated attributes 1760 * 1761 * After an operation that has changed the inode metadata, mark the 1762 * attribute cache as being invalid, then try to update it. Fake up 1763 * weak cache consistency data, if none exist. 1764 * 1765 * This function is mainly designed to be used by the ->write_done() functions. 1766 */ 1767 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1768 { 1769 int status; 1770 1771 spin_lock(&inode->i_lock); 1772 nfs_fattr_set_barrier(fattr); 1773 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1774 spin_unlock(&inode->i_lock); 1775 return status; 1776 } 1777 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1778 1779 1780 /* 1781 * Many nfs protocol calls return the new file attributes after 1782 * an operation. Here we update the inode to reflect the state 1783 * of the server's inode. 1784 * 1785 * This is a bit tricky because we have to make sure all dirty pages 1786 * have been sent off to the server before calling invalidate_inode_pages. 1787 * To make sure no other process adds more write requests while we try 1788 * our best to flush them, we make them sleep during the attribute refresh. 1789 * 1790 * A very similar scenario holds for the dir cache. 1791 */ 1792 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1793 { 1794 struct nfs_server *server; 1795 struct nfs_inode *nfsi = NFS_I(inode); 1796 loff_t cur_isize, new_isize; 1797 unsigned long invalid = 0; 1798 unsigned long now = jiffies; 1799 unsigned long save_cache_validity; 1800 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1801 bool cache_revalidated = true; 1802 bool attr_changed = false; 1803 bool have_delegation; 1804 1805 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1806 __func__, inode->i_sb->s_id, inode->i_ino, 1807 nfs_display_fhandle_hash(NFS_FH(inode)), 1808 atomic_read(&inode->i_count), fattr->valid); 1809 1810 /* No fileid? Just exit */ 1811 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) 1812 return 0; 1813 /* Has the inode gone and changed behind our back? */ 1814 if (nfsi->fileid != fattr->fileid) { 1815 /* Is this perhaps the mounted-on fileid? */ 1816 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && 1817 nfsi->fileid == fattr->mounted_on_fileid) 1818 return 0; 1819 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1820 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1821 NFS_SERVER(inode)->nfs_client->cl_hostname, 1822 inode->i_sb->s_id, (long long)nfsi->fileid, 1823 (long long)fattr->fileid); 1824 goto out_err; 1825 } 1826 1827 /* 1828 * Make sure the inode's type hasn't changed. 1829 */ 1830 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1831 /* 1832 * Big trouble! The inode has become a different object. 1833 */ 1834 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1835 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1836 goto out_err; 1837 } 1838 1839 server = NFS_SERVER(inode); 1840 /* Update the fsid? */ 1841 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1842 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1843 !IS_AUTOMOUNT(inode)) 1844 server->fsid = fattr->fsid; 1845 1846 /* Save the delegation state before clearing cache_validity */ 1847 have_delegation = nfs_have_delegated_attributes(inode); 1848 1849 /* 1850 * Update the read time so we don't revalidate too often. 1851 */ 1852 nfsi->read_cache_jiffies = fattr->time_start; 1853 1854 save_cache_validity = nfsi->cache_validity; 1855 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1856 | NFS_INO_INVALID_ATIME 1857 | NFS_INO_REVAL_FORCED 1858 | NFS_INO_REVAL_PAGECACHE); 1859 1860 /* Do atomic weak cache consistency updates */ 1861 nfs_wcc_update_inode(inode, fattr); 1862 1863 if (pnfs_layoutcommit_outstanding(inode)) { 1864 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; 1865 cache_revalidated = false; 1866 } 1867 1868 /* More cache consistency checks */ 1869 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1870 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { 1871 /* Could it be a race with writeback? */ 1872 if (!(have_writers || have_delegation)) { 1873 invalid |= NFS_INO_INVALID_DATA 1874 | NFS_INO_INVALID_ACCESS 1875 | NFS_INO_INVALID_ACL; 1876 /* Force revalidate of all attributes */ 1877 save_cache_validity |= NFS_INO_INVALID_CTIME 1878 | NFS_INO_INVALID_MTIME 1879 | NFS_INO_INVALID_SIZE 1880 | NFS_INO_INVALID_OTHER; 1881 if (S_ISDIR(inode->i_mode)) 1882 nfs_force_lookup_revalidate(inode); 1883 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1884 inode->i_sb->s_id, 1885 inode->i_ino); 1886 } else if (!have_delegation) 1887 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; 1888 inode_set_iversion_raw(inode, fattr->change_attr); 1889 attr_changed = true; 1890 } 1891 } else { 1892 nfsi->cache_validity |= save_cache_validity & 1893 (NFS_INO_INVALID_CHANGE 1894 | NFS_INO_REVAL_PAGECACHE 1895 | NFS_INO_REVAL_FORCED); 1896 cache_revalidated = false; 1897 } 1898 1899 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1900 inode->i_mtime = timespec_to_timespec64(fattr->mtime); 1901 } else if (server->caps & NFS_CAP_MTIME) { 1902 nfsi->cache_validity |= save_cache_validity & 1903 (NFS_INO_INVALID_MTIME 1904 | NFS_INO_REVAL_FORCED); 1905 cache_revalidated = false; 1906 } 1907 1908 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1909 inode->i_ctime = timespec_to_timespec64(fattr->ctime); 1910 } else if (server->caps & NFS_CAP_CTIME) { 1911 nfsi->cache_validity |= save_cache_validity & 1912 (NFS_INO_INVALID_CTIME 1913 | NFS_INO_REVAL_FORCED); 1914 cache_revalidated = false; 1915 } 1916 1917 /* Check if our cached file size is stale */ 1918 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1919 new_isize = nfs_size_to_loff_t(fattr->size); 1920 cur_isize = i_size_read(inode); 1921 if (new_isize != cur_isize && !have_delegation) { 1922 /* Do we perhaps have any outstanding writes, or has 1923 * the file grown beyond our last write? */ 1924 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 1925 i_size_write(inode, new_isize); 1926 if (!have_writers) 1927 invalid |= NFS_INO_INVALID_DATA; 1928 attr_changed = true; 1929 } 1930 dprintk("NFS: isize change on server for file %s/%ld " 1931 "(%Ld to %Ld)\n", 1932 inode->i_sb->s_id, 1933 inode->i_ino, 1934 (long long)cur_isize, 1935 (long long)new_isize); 1936 } 1937 } else { 1938 nfsi->cache_validity |= save_cache_validity & 1939 (NFS_INO_INVALID_SIZE 1940 | NFS_INO_REVAL_PAGECACHE 1941 | NFS_INO_REVAL_FORCED); 1942 cache_revalidated = false; 1943 } 1944 1945 1946 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1947 inode->i_atime = timespec_to_timespec64(fattr->atime); 1948 else if (server->caps & NFS_CAP_ATIME) { 1949 nfsi->cache_validity |= save_cache_validity & 1950 (NFS_INO_INVALID_ATIME 1951 | NFS_INO_REVAL_FORCED); 1952 cache_revalidated = false; 1953 } 1954 1955 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1956 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1957 umode_t newmode = inode->i_mode & S_IFMT; 1958 newmode |= fattr->mode & S_IALLUGO; 1959 inode->i_mode = newmode; 1960 invalid |= NFS_INO_INVALID_ACCESS 1961 | NFS_INO_INVALID_ACL; 1962 attr_changed = true; 1963 } 1964 } else if (server->caps & NFS_CAP_MODE) { 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_OWNER) { 1972 if (!uid_eq(inode->i_uid, fattr->uid)) { 1973 invalid |= NFS_INO_INVALID_ACCESS 1974 | NFS_INO_INVALID_ACL; 1975 inode->i_uid = fattr->uid; 1976 attr_changed = true; 1977 } 1978 } else if (server->caps & NFS_CAP_OWNER) { 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_GROUP) { 1986 if (!gid_eq(inode->i_gid, fattr->gid)) { 1987 invalid |= NFS_INO_INVALID_ACCESS 1988 | NFS_INO_INVALID_ACL; 1989 inode->i_gid = fattr->gid; 1990 attr_changed = true; 1991 } 1992 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 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_NLINK) { 2000 if (inode->i_nlink != fattr->nlink) { 2001 if (S_ISDIR(inode->i_mode)) 2002 invalid |= NFS_INO_INVALID_DATA; 2003 set_nlink(inode, fattr->nlink); 2004 attr_changed = true; 2005 } 2006 } else if (server->caps & NFS_CAP_NLINK) { 2007 nfsi->cache_validity |= save_cache_validity & 2008 (NFS_INO_INVALID_OTHER 2009 | NFS_INO_REVAL_FORCED); 2010 cache_revalidated = false; 2011 } 2012 2013 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 2014 /* 2015 * report the blocks in 512byte units 2016 */ 2017 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 2018 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 2019 inode->i_blocks = fattr->du.nfs2.blocks; 2020 else 2021 cache_revalidated = false; 2022 2023 /* Update attrtimeo value if we're out of the unstable period */ 2024 if (attr_changed) { 2025 invalid &= ~NFS_INO_INVALID_ATTR; 2026 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 2027 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 2028 nfsi->attrtimeo_timestamp = now; 2029 /* Set barrier to be more recent than all outstanding updates */ 2030 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 2031 } else { 2032 if (cache_revalidated) { 2033 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 2034 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 2035 nfsi->attrtimeo <<= 1; 2036 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 2037 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 2038 } 2039 nfsi->attrtimeo_timestamp = now; 2040 } 2041 /* Set the barrier to be more recent than this fattr */ 2042 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 2043 nfsi->attr_gencount = fattr->gencount; 2044 } 2045 2046 /* Don't invalidate the data if we were to blame */ 2047 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 2048 || S_ISLNK(inode->i_mode))) 2049 invalid &= ~NFS_INO_INVALID_DATA; 2050 nfs_set_cache_invalid(inode, invalid); 2051 2052 return 0; 2053 out_err: 2054 /* 2055 * No need to worry about unhashing the dentry, as the 2056 * lookup validation will know that the inode is bad. 2057 * (But we fall through to invalidate the caches.) 2058 */ 2059 nfs_invalidate_inode(inode); 2060 return -ESTALE; 2061 } 2062 2063 struct inode *nfs_alloc_inode(struct super_block *sb) 2064 { 2065 struct nfs_inode *nfsi; 2066 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 2067 if (!nfsi) 2068 return NULL; 2069 nfsi->flags = 0UL; 2070 nfsi->cache_validity = 0UL; 2071 #if IS_ENABLED(CONFIG_NFS_V4) 2072 nfsi->nfs4_acl = NULL; 2073 #endif /* CONFIG_NFS_V4 */ 2074 return &nfsi->vfs_inode; 2075 } 2076 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 2077 2078 void nfs_free_inode(struct inode *inode) 2079 { 2080 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 2081 } 2082 EXPORT_SYMBOL_GPL(nfs_free_inode); 2083 2084 static inline void nfs4_init_once(struct nfs_inode *nfsi) 2085 { 2086 #if IS_ENABLED(CONFIG_NFS_V4) 2087 INIT_LIST_HEAD(&nfsi->open_states); 2088 nfsi->delegation = NULL; 2089 init_rwsem(&nfsi->rwsem); 2090 nfsi->layout = NULL; 2091 #endif 2092 } 2093 2094 static void init_once(void *foo) 2095 { 2096 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 2097 2098 inode_init_once(&nfsi->vfs_inode); 2099 INIT_LIST_HEAD(&nfsi->open_files); 2100 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2101 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2102 INIT_LIST_HEAD(&nfsi->commit_info.list); 2103 atomic_long_set(&nfsi->nrequests, 0); 2104 atomic_long_set(&nfsi->commit_info.ncommit, 0); 2105 atomic_set(&nfsi->commit_info.rpcs_out, 0); 2106 init_rwsem(&nfsi->rmdir_sem); 2107 mutex_init(&nfsi->commit_mutex); 2108 nfs4_init_once(nfsi); 2109 } 2110 2111 static int __init nfs_init_inodecache(void) 2112 { 2113 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2114 sizeof(struct nfs_inode), 2115 0, (SLAB_RECLAIM_ACCOUNT| 2116 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 2117 init_once); 2118 if (nfs_inode_cachep == NULL) 2119 return -ENOMEM; 2120 2121 return 0; 2122 } 2123 2124 static void nfs_destroy_inodecache(void) 2125 { 2126 /* 2127 * Make sure all delayed rcu free inodes are flushed before we 2128 * destroy cache. 2129 */ 2130 rcu_barrier(); 2131 kmem_cache_destroy(nfs_inode_cachep); 2132 } 2133 2134 struct workqueue_struct *nfsiod_workqueue; 2135 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2136 2137 /* 2138 * start up the nfsiod workqueue 2139 */ 2140 static int nfsiod_start(void) 2141 { 2142 struct workqueue_struct *wq; 2143 dprintk("RPC: creating workqueue nfsiod\n"); 2144 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2145 if (wq == NULL) 2146 return -ENOMEM; 2147 nfsiod_workqueue = wq; 2148 return 0; 2149 } 2150 2151 /* 2152 * Destroy the nfsiod workqueue 2153 */ 2154 static void nfsiod_stop(void) 2155 { 2156 struct workqueue_struct *wq; 2157 2158 wq = nfsiod_workqueue; 2159 if (wq == NULL) 2160 return; 2161 nfsiod_workqueue = NULL; 2162 destroy_workqueue(wq); 2163 } 2164 2165 unsigned int nfs_net_id; 2166 EXPORT_SYMBOL_GPL(nfs_net_id); 2167 2168 static int nfs_net_init(struct net *net) 2169 { 2170 nfs_clients_init(net); 2171 return nfs_fs_proc_net_init(net); 2172 } 2173 2174 static void nfs_net_exit(struct net *net) 2175 { 2176 nfs_fs_proc_net_exit(net); 2177 nfs_clients_exit(net); 2178 } 2179 2180 static struct pernet_operations nfs_net_ops = { 2181 .init = nfs_net_init, 2182 .exit = nfs_net_exit, 2183 .id = &nfs_net_id, 2184 .size = sizeof(struct nfs_net), 2185 }; 2186 2187 /* 2188 * Initialize NFS 2189 */ 2190 static int __init init_nfs_fs(void) 2191 { 2192 int err; 2193 2194 err = nfs_sysfs_init(); 2195 if (err < 0) 2196 goto out10; 2197 2198 err = register_pernet_subsys(&nfs_net_ops); 2199 if (err < 0) 2200 goto out9; 2201 2202 err = nfs_fscache_register(); 2203 if (err < 0) 2204 goto out8; 2205 2206 err = nfsiod_start(); 2207 if (err) 2208 goto out7; 2209 2210 err = nfs_fs_proc_init(); 2211 if (err) 2212 goto out6; 2213 2214 err = nfs_init_nfspagecache(); 2215 if (err) 2216 goto out5; 2217 2218 err = nfs_init_inodecache(); 2219 if (err) 2220 goto out4; 2221 2222 err = nfs_init_readpagecache(); 2223 if (err) 2224 goto out3; 2225 2226 err = nfs_init_writepagecache(); 2227 if (err) 2228 goto out2; 2229 2230 err = nfs_init_directcache(); 2231 if (err) 2232 goto out1; 2233 2234 rpc_proc_register(&init_net, &nfs_rpcstat); 2235 2236 err = register_nfs_fs(); 2237 if (err) 2238 goto out0; 2239 2240 return 0; 2241 out0: 2242 rpc_proc_unregister(&init_net, "nfs"); 2243 nfs_destroy_directcache(); 2244 out1: 2245 nfs_destroy_writepagecache(); 2246 out2: 2247 nfs_destroy_readpagecache(); 2248 out3: 2249 nfs_destroy_inodecache(); 2250 out4: 2251 nfs_destroy_nfspagecache(); 2252 out5: 2253 nfs_fs_proc_exit(); 2254 out6: 2255 nfsiod_stop(); 2256 out7: 2257 nfs_fscache_unregister(); 2258 out8: 2259 unregister_pernet_subsys(&nfs_net_ops); 2260 out9: 2261 nfs_sysfs_exit(); 2262 out10: 2263 return err; 2264 } 2265 2266 static void __exit exit_nfs_fs(void) 2267 { 2268 nfs_destroy_directcache(); 2269 nfs_destroy_writepagecache(); 2270 nfs_destroy_readpagecache(); 2271 nfs_destroy_inodecache(); 2272 nfs_destroy_nfspagecache(); 2273 nfs_fscache_unregister(); 2274 unregister_pernet_subsys(&nfs_net_ops); 2275 rpc_proc_unregister(&init_net, "nfs"); 2276 unregister_nfs_fs(); 2277 nfs_fs_proc_exit(); 2278 nfsiod_stop(); 2279 nfs_sysfs_exit(); 2280 } 2281 2282 /* Not quite true; I just maintain it */ 2283 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2284 MODULE_LICENSE("GPL"); 2285 module_param(enable_ino64, bool, 0644); 2286 2287 module_init(init_nfs_fs) 2288 module_exit(exit_nfs_fs) 2289