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