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