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