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 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(const struct path *path, struct kstat *stat, 707 u32 request_mask, unsigned int query_flags) 708 { 709 struct inode *inode = d_inode(path->dentry); 710 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 711 int err = 0; 712 713 trace_nfs_getattr_enter(inode); 714 /* Flush out writes to the server in order to update c/mtime. */ 715 if (S_ISREG(inode->i_mode)) { 716 err = filemap_write_and_wait(inode->i_mapping); 717 if (err) 718 goto out; 719 } 720 721 /* 722 * We may force a getattr if the user cares about atime. 723 * 724 * Note that we only have to check the vfsmount flags here: 725 * - NFS always sets S_NOATIME by so checking it would give a 726 * bogus result 727 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 728 * no point in checking those. 729 */ 730 if ((path->mnt->mnt_flags & MNT_NOATIME) || 731 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 732 need_atime = 0; 733 734 if (need_atime || nfs_need_revalidate_inode(inode)) { 735 struct nfs_server *server = NFS_SERVER(inode); 736 737 nfs_readdirplus_parent_cache_miss(path->dentry); 738 err = __nfs_revalidate_inode(server, inode); 739 } else 740 nfs_readdirplus_parent_cache_hit(path->dentry); 741 if (!err) { 742 generic_fillattr(inode, stat); 743 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 744 if (S_ISDIR(inode->i_mode)) 745 stat->blksize = NFS_SERVER(inode)->dtsize; 746 } 747 out: 748 trace_nfs_getattr_exit(inode, err); 749 return err; 750 } 751 EXPORT_SYMBOL_GPL(nfs_getattr); 752 753 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 754 { 755 atomic_set(&l_ctx->count, 1); 756 l_ctx->lockowner = current->files; 757 INIT_LIST_HEAD(&l_ctx->list); 758 atomic_set(&l_ctx->io_count, 0); 759 } 760 761 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 762 { 763 struct nfs_lock_context *head = &ctx->lock_context; 764 struct nfs_lock_context *pos = head; 765 766 do { 767 if (pos->lockowner != current->files) 768 continue; 769 atomic_inc(&pos->count); 770 return pos; 771 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 772 return NULL; 773 } 774 775 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 776 { 777 struct nfs_lock_context *res, *new = NULL; 778 struct inode *inode = d_inode(ctx->dentry); 779 780 spin_lock(&inode->i_lock); 781 res = __nfs_find_lock_context(ctx); 782 if (res == NULL) { 783 spin_unlock(&inode->i_lock); 784 new = kmalloc(sizeof(*new), GFP_KERNEL); 785 if (new == NULL) 786 return ERR_PTR(-ENOMEM); 787 nfs_init_lock_context(new); 788 spin_lock(&inode->i_lock); 789 res = __nfs_find_lock_context(ctx); 790 if (res == NULL) { 791 list_add_tail(&new->list, &ctx->lock_context.list); 792 new->open_context = ctx; 793 res = new; 794 new = NULL; 795 } 796 } 797 spin_unlock(&inode->i_lock); 798 kfree(new); 799 return res; 800 } 801 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 802 803 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 804 { 805 struct nfs_open_context *ctx = l_ctx->open_context; 806 struct inode *inode = d_inode(ctx->dentry); 807 808 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 809 return; 810 list_del(&l_ctx->list); 811 spin_unlock(&inode->i_lock); 812 kfree(l_ctx); 813 } 814 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 815 816 /** 817 * nfs_close_context - Common close_context() routine NFSv2/v3 818 * @ctx: pointer to context 819 * @is_sync: is this a synchronous close 820 * 821 * Ensure that the attributes are up to date if we're mounted 822 * with close-to-open semantics and we have cached data that will 823 * need to be revalidated on open. 824 */ 825 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 826 { 827 struct nfs_inode *nfsi; 828 struct inode *inode; 829 struct nfs_server *server; 830 831 if (!(ctx->mode & FMODE_WRITE)) 832 return; 833 if (!is_sync) 834 return; 835 inode = d_inode(ctx->dentry); 836 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 837 return; 838 nfsi = NFS_I(inode); 839 if (inode->i_mapping->nrpages == 0) 840 return; 841 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 842 return; 843 if (!list_empty(&nfsi->open_files)) 844 return; 845 server = NFS_SERVER(inode); 846 if (server->flags & NFS_MOUNT_NOCTO) 847 return; 848 nfs_revalidate_inode(server, inode); 849 } 850 EXPORT_SYMBOL_GPL(nfs_close_context); 851 852 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 853 fmode_t f_mode, 854 struct file *filp) 855 { 856 struct nfs_open_context *ctx; 857 struct rpc_cred *cred = rpc_lookup_cred(); 858 if (IS_ERR(cred)) 859 return ERR_CAST(cred); 860 861 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 862 if (!ctx) { 863 put_rpccred(cred); 864 return ERR_PTR(-ENOMEM); 865 } 866 nfs_sb_active(dentry->d_sb); 867 ctx->dentry = dget(dentry); 868 ctx->cred = cred; 869 ctx->state = NULL; 870 ctx->mode = f_mode; 871 ctx->flags = 0; 872 ctx->error = 0; 873 ctx->flock_owner = (fl_owner_t)filp; 874 nfs_init_lock_context(&ctx->lock_context); 875 ctx->lock_context.open_context = ctx; 876 INIT_LIST_HEAD(&ctx->list); 877 ctx->mdsthreshold = NULL; 878 return ctx; 879 } 880 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 881 882 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 883 { 884 if (ctx != NULL) 885 atomic_inc(&ctx->lock_context.count); 886 return ctx; 887 } 888 EXPORT_SYMBOL_GPL(get_nfs_open_context); 889 890 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 891 { 892 struct inode *inode = d_inode(ctx->dentry); 893 struct super_block *sb = ctx->dentry->d_sb; 894 895 if (!list_empty(&ctx->list)) { 896 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 897 return; 898 list_del(&ctx->list); 899 spin_unlock(&inode->i_lock); 900 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 901 return; 902 if (inode != NULL) 903 NFS_PROTO(inode)->close_context(ctx, is_sync); 904 if (ctx->cred != NULL) 905 put_rpccred(ctx->cred); 906 dput(ctx->dentry); 907 nfs_sb_deactive(sb); 908 kfree(ctx->mdsthreshold); 909 kfree(ctx); 910 } 911 912 void put_nfs_open_context(struct nfs_open_context *ctx) 913 { 914 __put_nfs_open_context(ctx, 0); 915 } 916 EXPORT_SYMBOL_GPL(put_nfs_open_context); 917 918 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 919 { 920 __put_nfs_open_context(ctx, 1); 921 } 922 923 /* 924 * Ensure that mmap has a recent RPC credential for use when writing out 925 * shared pages 926 */ 927 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 928 { 929 struct inode *inode = d_inode(ctx->dentry); 930 struct nfs_inode *nfsi = NFS_I(inode); 931 932 spin_lock(&inode->i_lock); 933 if (ctx->mode & FMODE_WRITE) 934 list_add(&ctx->list, &nfsi->open_files); 935 else 936 list_add_tail(&ctx->list, &nfsi->open_files); 937 spin_unlock(&inode->i_lock); 938 } 939 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 940 941 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 942 { 943 filp->private_data = get_nfs_open_context(ctx); 944 if (list_empty(&ctx->list)) 945 nfs_inode_attach_open_context(ctx); 946 } 947 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 948 949 /* 950 * Given an inode, search for an open context with the desired characteristics 951 */ 952 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 953 { 954 struct nfs_inode *nfsi = NFS_I(inode); 955 struct nfs_open_context *pos, *ctx = NULL; 956 957 spin_lock(&inode->i_lock); 958 list_for_each_entry(pos, &nfsi->open_files, list) { 959 if (cred != NULL && pos->cred != cred) 960 continue; 961 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 962 continue; 963 ctx = get_nfs_open_context(pos); 964 break; 965 } 966 spin_unlock(&inode->i_lock); 967 return ctx; 968 } 969 970 void nfs_file_clear_open_context(struct file *filp) 971 { 972 struct nfs_open_context *ctx = nfs_file_open_context(filp); 973 974 if (ctx) { 975 struct inode *inode = d_inode(ctx->dentry); 976 977 /* 978 * We fatal error on write before. Try to writeback 979 * every page again. 980 */ 981 if (ctx->error < 0) 982 invalidate_inode_pages2(inode->i_mapping); 983 filp->private_data = NULL; 984 spin_lock(&inode->i_lock); 985 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 986 spin_unlock(&inode->i_lock); 987 put_nfs_open_context_sync(ctx); 988 } 989 } 990 991 /* 992 * These allocate and release file read/write context information. 993 */ 994 int nfs_open(struct inode *inode, struct file *filp) 995 { 996 struct nfs_open_context *ctx; 997 998 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); 999 if (IS_ERR(ctx)) 1000 return PTR_ERR(ctx); 1001 nfs_file_set_open_context(filp, ctx); 1002 put_nfs_open_context(ctx); 1003 nfs_fscache_open_file(inode, filp); 1004 return 0; 1005 } 1006 1007 /* 1008 * This function is called whenever some part of NFS notices that 1009 * the cached attributes have to be refreshed. 1010 */ 1011 int 1012 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1013 { 1014 int status = -ESTALE; 1015 struct nfs4_label *label = NULL; 1016 struct nfs_fattr *fattr = NULL; 1017 struct nfs_inode *nfsi = NFS_I(inode); 1018 1019 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1020 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1021 1022 trace_nfs_revalidate_inode_enter(inode); 1023 1024 if (is_bad_inode(inode)) 1025 goto out; 1026 if (NFS_STALE(inode)) 1027 goto out; 1028 1029 /* pNFS: Attributes aren't updated until we layoutcommit */ 1030 if (S_ISREG(inode->i_mode)) { 1031 status = pnfs_sync_inode(inode, false); 1032 if (status) 1033 goto out; 1034 } 1035 1036 status = -ENOMEM; 1037 fattr = nfs_alloc_fattr(); 1038 if (fattr == NULL) 1039 goto out; 1040 1041 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1042 1043 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 1044 if (IS_ERR(label)) { 1045 status = PTR_ERR(label); 1046 goto out; 1047 } 1048 1049 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 1050 if (status != 0) { 1051 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1052 inode->i_sb->s_id, 1053 (unsigned long long)NFS_FILEID(inode), status); 1054 if (status == -ESTALE) { 1055 nfs_zap_caches(inode); 1056 if (!S_ISDIR(inode->i_mode)) 1057 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 1058 } 1059 goto err_out; 1060 } 1061 1062 status = nfs_refresh_inode(inode, fattr); 1063 if (status) { 1064 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1065 inode->i_sb->s_id, 1066 (unsigned long long)NFS_FILEID(inode), status); 1067 goto err_out; 1068 } 1069 1070 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1071 nfs_zap_acl_cache(inode); 1072 1073 nfs_setsecurity(inode, fattr, label); 1074 1075 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1076 inode->i_sb->s_id, 1077 (unsigned long long)NFS_FILEID(inode)); 1078 1079 err_out: 1080 nfs4_label_free(label); 1081 out: 1082 nfs_free_fattr(fattr); 1083 trace_nfs_revalidate_inode_exit(inode, status); 1084 return status; 1085 } 1086 1087 int nfs_attribute_cache_expired(struct inode *inode) 1088 { 1089 if (nfs_have_delegated_attributes(inode)) 1090 return 0; 1091 return nfs_attribute_timeout(inode); 1092 } 1093 1094 /** 1095 * nfs_revalidate_inode - Revalidate the inode attributes 1096 * @server - pointer to nfs_server struct 1097 * @inode - pointer to inode struct 1098 * 1099 * Updates inode attribute information by retrieving the data from the server. 1100 */ 1101 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1102 { 1103 if (!nfs_need_revalidate_inode(inode)) 1104 return NFS_STALE(inode) ? -ESTALE : 0; 1105 return __nfs_revalidate_inode(server, inode); 1106 } 1107 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1108 1109 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1110 { 1111 struct nfs_inode *nfsi = NFS_I(inode); 1112 int ret; 1113 1114 if (mapping->nrpages != 0) { 1115 if (S_ISREG(inode->i_mode)) { 1116 unmap_mapping_range(mapping, 0, 0, 0); 1117 ret = nfs_sync_mapping(mapping); 1118 if (ret < 0) 1119 return ret; 1120 } 1121 ret = invalidate_inode_pages2(mapping); 1122 if (ret < 0) 1123 return ret; 1124 } 1125 if (S_ISDIR(inode->i_mode)) { 1126 spin_lock(&inode->i_lock); 1127 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1128 spin_unlock(&inode->i_lock); 1129 } 1130 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1131 nfs_fscache_wait_on_invalidate(inode); 1132 1133 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1134 inode->i_sb->s_id, 1135 (unsigned long long)NFS_FILEID(inode)); 1136 return 0; 1137 } 1138 1139 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1140 { 1141 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) || 1142 NFS_STALE(inode); 1143 } 1144 1145 int nfs_revalidate_mapping_rcu(struct inode *inode) 1146 { 1147 struct nfs_inode *nfsi = NFS_I(inode); 1148 unsigned long *bitlock = &nfsi->flags; 1149 int ret = 0; 1150 1151 if (IS_SWAPFILE(inode)) 1152 goto out; 1153 if (nfs_mapping_need_revalidate_inode(inode)) { 1154 ret = -ECHILD; 1155 goto out; 1156 } 1157 spin_lock(&inode->i_lock); 1158 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1159 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1160 ret = -ECHILD; 1161 spin_unlock(&inode->i_lock); 1162 out: 1163 return ret; 1164 } 1165 1166 /** 1167 * nfs_revalidate_mapping - Revalidate the pagecache 1168 * @inode - pointer to host inode 1169 * @mapping - pointer to mapping 1170 */ 1171 int nfs_revalidate_mapping(struct inode *inode, 1172 struct address_space *mapping) 1173 { 1174 struct nfs_inode *nfsi = NFS_I(inode); 1175 unsigned long *bitlock = &nfsi->flags; 1176 int ret = 0; 1177 1178 /* swapfiles are not supposed to be shared. */ 1179 if (IS_SWAPFILE(inode)) 1180 goto out; 1181 1182 if (nfs_mapping_need_revalidate_inode(inode)) { 1183 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1184 if (ret < 0) 1185 goto out; 1186 } 1187 1188 /* 1189 * We must clear NFS_INO_INVALID_DATA first to ensure that 1190 * invalidations that come in while we're shooting down the mappings 1191 * are respected. But, that leaves a race window where one revalidator 1192 * can clear the flag, and then another checks it before the mapping 1193 * gets invalidated. Fix that by serializing access to this part of 1194 * the function. 1195 * 1196 * At the same time, we need to allow other tasks to see whether we 1197 * might be in the middle of invalidating the pages, so we only set 1198 * the bit lock here if it looks like we're going to be doing that. 1199 */ 1200 for (;;) { 1201 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1202 nfs_wait_bit_killable, TASK_KILLABLE); 1203 if (ret) 1204 goto out; 1205 spin_lock(&inode->i_lock); 1206 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1207 spin_unlock(&inode->i_lock); 1208 continue; 1209 } 1210 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1211 break; 1212 spin_unlock(&inode->i_lock); 1213 goto out; 1214 } 1215 1216 set_bit(NFS_INO_INVALIDATING, bitlock); 1217 smp_wmb(); 1218 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1219 spin_unlock(&inode->i_lock); 1220 trace_nfs_invalidate_mapping_enter(inode); 1221 ret = nfs_invalidate_mapping(inode, mapping); 1222 trace_nfs_invalidate_mapping_exit(inode, ret); 1223 1224 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1225 smp_mb__after_atomic(); 1226 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1227 out: 1228 return ret; 1229 } 1230 1231 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1232 { 1233 struct inode *inode = &nfsi->vfs_inode; 1234 1235 assert_spin_locked(&inode->i_lock); 1236 1237 if (!S_ISREG(inode->i_mode)) 1238 return false; 1239 if (list_empty(&nfsi->open_files)) 1240 return false; 1241 /* Note: This relies on nfsi->open_files being ordered with writers 1242 * being placed at the head of the list. 1243 * See nfs_inode_attach_open_context() 1244 */ 1245 return (list_first_entry(&nfsi->open_files, 1246 struct nfs_open_context, 1247 list)->mode & FMODE_WRITE) == FMODE_WRITE; 1248 } 1249 1250 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1251 { 1252 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1253 } 1254 1255 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1256 { 1257 struct nfs_inode *nfsi = NFS_I(inode); 1258 unsigned long ret = 0; 1259 1260 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1261 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1262 && inode->i_version == fattr->pre_change_attr) { 1263 inode->i_version = fattr->change_attr; 1264 if (S_ISDIR(inode->i_mode)) 1265 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1266 ret |= NFS_INO_INVALID_ATTR; 1267 } 1268 /* If we have atomic WCC data, we may update some attributes */ 1269 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1270 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1271 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1272 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1273 ret |= NFS_INO_INVALID_ATTR; 1274 } 1275 1276 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1277 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1278 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1279 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1280 if (S_ISDIR(inode->i_mode)) 1281 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1282 ret |= NFS_INO_INVALID_ATTR; 1283 } 1284 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1285 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1286 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1287 && nfsi->nrequests == 0) { 1288 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1289 ret |= NFS_INO_INVALID_ATTR; 1290 } 1291 1292 return ret; 1293 } 1294 1295 /** 1296 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1297 * @inode - pointer to inode 1298 * @fattr - updated attributes 1299 * 1300 * Verifies the attribute cache. If we have just changed the attributes, 1301 * so that fattr carries weak cache consistency data, then it may 1302 * also update the ctime/mtime/change_attribute. 1303 */ 1304 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1305 { 1306 struct nfs_inode *nfsi = NFS_I(inode); 1307 loff_t cur_size, new_isize; 1308 unsigned long invalid = 0; 1309 1310 1311 if (nfs_have_delegated_attributes(inode)) 1312 return 0; 1313 /* Has the inode gone and changed behind our back? */ 1314 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1315 return -EIO; 1316 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1317 return -EIO; 1318 1319 if (!nfs_file_has_buffered_writers(nfsi)) { 1320 /* Verify a few of the more important attributes */ 1321 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr) 1322 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE; 1323 1324 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1325 invalid |= NFS_INO_INVALID_ATTR; 1326 1327 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime)) 1328 invalid |= NFS_INO_INVALID_ATTR; 1329 1330 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1331 cur_size = i_size_read(inode); 1332 new_isize = nfs_size_to_loff_t(fattr->size); 1333 if (cur_size != new_isize) 1334 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1335 } 1336 } 1337 1338 /* Have any file permissions changed? */ 1339 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1340 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1341 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1342 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1343 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1344 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1345 1346 /* Has the link count changed? */ 1347 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1348 invalid |= NFS_INO_INVALID_ATTR; 1349 1350 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1351 invalid |= NFS_INO_INVALID_ATIME; 1352 1353 if (invalid != 0) 1354 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED); 1355 1356 nfsi->read_cache_jiffies = fattr->time_start; 1357 return 0; 1358 } 1359 1360 static atomic_long_t nfs_attr_generation_counter; 1361 1362 static unsigned long nfs_read_attr_generation_counter(void) 1363 { 1364 return atomic_long_read(&nfs_attr_generation_counter); 1365 } 1366 1367 unsigned long nfs_inc_attr_generation_counter(void) 1368 { 1369 return atomic_long_inc_return(&nfs_attr_generation_counter); 1370 } 1371 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1372 1373 void nfs_fattr_init(struct nfs_fattr *fattr) 1374 { 1375 fattr->valid = 0; 1376 fattr->time_start = jiffies; 1377 fattr->gencount = nfs_inc_attr_generation_counter(); 1378 fattr->owner_name = NULL; 1379 fattr->group_name = NULL; 1380 } 1381 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1382 1383 /** 1384 * nfs_fattr_set_barrier 1385 * @fattr: attributes 1386 * 1387 * Used to set a barrier after an attribute was updated. This 1388 * barrier ensures that older attributes from RPC calls that may 1389 * have raced with our update cannot clobber these new values. 1390 * Note that you are still responsible for ensuring that other 1391 * operations which change the attribute on the server do not 1392 * collide. 1393 */ 1394 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1395 { 1396 fattr->gencount = nfs_inc_attr_generation_counter(); 1397 } 1398 1399 struct nfs_fattr *nfs_alloc_fattr(void) 1400 { 1401 struct nfs_fattr *fattr; 1402 1403 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1404 if (fattr != NULL) 1405 nfs_fattr_init(fattr); 1406 return fattr; 1407 } 1408 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1409 1410 struct nfs_fh *nfs_alloc_fhandle(void) 1411 { 1412 struct nfs_fh *fh; 1413 1414 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1415 if (fh != NULL) 1416 fh->size = 0; 1417 return fh; 1418 } 1419 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1420 1421 #ifdef NFS_DEBUG 1422 /* 1423 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1424 * in the same way that wireshark does 1425 * 1426 * @fh: file handle 1427 * 1428 * For debugging only. 1429 */ 1430 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1431 { 1432 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1433 * not on the result */ 1434 return nfs_fhandle_hash(fh); 1435 } 1436 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1437 1438 /* 1439 * _nfs_display_fhandle - display an NFS file handle on the console 1440 * 1441 * @fh: file handle to display 1442 * @caption: display caption 1443 * 1444 * For debugging only. 1445 */ 1446 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1447 { 1448 unsigned short i; 1449 1450 if (fh == NULL || fh->size == 0) { 1451 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1452 return; 1453 } 1454 1455 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1456 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1457 for (i = 0; i < fh->size; i += 16) { 1458 __be32 *pos = (__be32 *)&fh->data[i]; 1459 1460 switch ((fh->size - i - 1) >> 2) { 1461 case 0: 1462 printk(KERN_DEFAULT " %08x\n", 1463 be32_to_cpup(pos)); 1464 break; 1465 case 1: 1466 printk(KERN_DEFAULT " %08x %08x\n", 1467 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1468 break; 1469 case 2: 1470 printk(KERN_DEFAULT " %08x %08x %08x\n", 1471 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1472 be32_to_cpup(pos + 2)); 1473 break; 1474 default: 1475 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1476 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1477 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1478 } 1479 } 1480 } 1481 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1482 #endif 1483 1484 /** 1485 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1486 * @inode - pointer to inode 1487 * @fattr - attributes 1488 * 1489 * Attempt to divine whether or not an RPC call reply carrying stale 1490 * attributes got scheduled after another call carrying updated ones. 1491 * 1492 * To do so, the function first assumes that a more recent ctime means 1493 * that the attributes in fattr are newer, however it also attempt to 1494 * catch the case where ctime either didn't change, or went backwards 1495 * (if someone reset the clock on the server) by looking at whether 1496 * or not this RPC call was started after the inode was last updated. 1497 * Note also the check for wraparound of 'attr_gencount' 1498 * 1499 * The function returns 'true' if it thinks the attributes in 'fattr' are 1500 * more recent than the ones cached in the inode. 1501 * 1502 */ 1503 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1504 { 1505 const struct nfs_inode *nfsi = NFS_I(inode); 1506 1507 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1508 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1509 } 1510 1511 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1512 { 1513 int ret; 1514 1515 trace_nfs_refresh_inode_enter(inode); 1516 1517 if (nfs_inode_attrs_need_update(inode, fattr)) 1518 ret = nfs_update_inode(inode, fattr); 1519 else 1520 ret = nfs_check_inode_attributes(inode, fattr); 1521 1522 trace_nfs_refresh_inode_exit(inode, ret); 1523 return ret; 1524 } 1525 1526 /** 1527 * nfs_refresh_inode - try to update the inode attribute cache 1528 * @inode - pointer to inode 1529 * @fattr - updated attributes 1530 * 1531 * Check that an RPC call that returned attributes has not overlapped with 1532 * other recent updates of the inode metadata, then decide whether it is 1533 * safe to do a full update of the inode attributes, or whether just to 1534 * call nfs_check_inode_attributes. 1535 */ 1536 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1537 { 1538 int status; 1539 1540 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1541 return 0; 1542 spin_lock(&inode->i_lock); 1543 status = nfs_refresh_inode_locked(inode, fattr); 1544 spin_unlock(&inode->i_lock); 1545 1546 return status; 1547 } 1548 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1549 1550 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1551 { 1552 unsigned long invalid = NFS_INO_INVALID_ATTR; 1553 1554 if (S_ISDIR(inode->i_mode)) 1555 invalid |= NFS_INO_INVALID_DATA; 1556 nfs_set_cache_invalid(inode, invalid); 1557 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1558 return 0; 1559 return nfs_refresh_inode_locked(inode, fattr); 1560 } 1561 1562 /** 1563 * nfs_post_op_update_inode - try to update the inode attribute cache 1564 * @inode - pointer to inode 1565 * @fattr - updated attributes 1566 * 1567 * After an operation that has changed the inode metadata, mark the 1568 * attribute cache as being invalid, then try to update it. 1569 * 1570 * NB: if the server didn't return any post op attributes, this 1571 * function will force the retrieval of attributes before the next 1572 * NFS request. Thus it should be used only for operations that 1573 * are expected to change one or more attributes, to avoid 1574 * unnecessary NFS requests and trips through nfs_update_inode(). 1575 */ 1576 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1577 { 1578 int status; 1579 1580 spin_lock(&inode->i_lock); 1581 nfs_fattr_set_barrier(fattr); 1582 status = nfs_post_op_update_inode_locked(inode, fattr); 1583 spin_unlock(&inode->i_lock); 1584 1585 return status; 1586 } 1587 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1588 1589 /** 1590 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1591 * @inode - pointer to inode 1592 * @fattr - updated attributes 1593 * 1594 * After an operation that has changed the inode metadata, mark the 1595 * attribute cache as being invalid, then try to update it. Fake up 1596 * weak cache consistency data, if none exist. 1597 * 1598 * This function is mainly designed to be used by the ->write_done() functions. 1599 */ 1600 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1601 { 1602 int status; 1603 1604 /* Don't do a WCC update if these attributes are already stale */ 1605 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1606 !nfs_inode_attrs_need_update(inode, fattr)) { 1607 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1608 | NFS_ATTR_FATTR_PRESIZE 1609 | NFS_ATTR_FATTR_PREMTIME 1610 | NFS_ATTR_FATTR_PRECTIME); 1611 goto out_noforce; 1612 } 1613 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1614 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1615 fattr->pre_change_attr = inode->i_version; 1616 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1617 } 1618 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1619 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1620 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1621 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1622 } 1623 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1624 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1625 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1626 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1627 } 1628 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1629 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1630 fattr->pre_size = i_size_read(inode); 1631 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1632 } 1633 out_noforce: 1634 status = nfs_post_op_update_inode_locked(inode, fattr); 1635 return status; 1636 } 1637 1638 /** 1639 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1640 * @inode - pointer to inode 1641 * @fattr - updated attributes 1642 * 1643 * After an operation that has changed the inode metadata, mark the 1644 * attribute cache as being invalid, then try to update it. Fake up 1645 * weak cache consistency data, if none exist. 1646 * 1647 * This function is mainly designed to be used by the ->write_done() functions. 1648 */ 1649 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1650 { 1651 int status; 1652 1653 spin_lock(&inode->i_lock); 1654 nfs_fattr_set_barrier(fattr); 1655 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1656 spin_unlock(&inode->i_lock); 1657 return status; 1658 } 1659 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1660 1661 1662 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1663 struct nfs_fattr *fattr) 1664 { 1665 bool ret1 = true, ret2 = true; 1666 1667 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1668 ret1 = (nfsi->fileid == fattr->fileid); 1669 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1670 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1671 return ret1 || ret2; 1672 } 1673 1674 /* 1675 * Many nfs protocol calls return the new file attributes after 1676 * an operation. Here we update the inode to reflect the state 1677 * of the server's inode. 1678 * 1679 * This is a bit tricky because we have to make sure all dirty pages 1680 * have been sent off to the server before calling invalidate_inode_pages. 1681 * To make sure no other process adds more write requests while we try 1682 * our best to flush them, we make them sleep during the attribute refresh. 1683 * 1684 * A very similar scenario holds for the dir cache. 1685 */ 1686 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1687 { 1688 struct nfs_server *server; 1689 struct nfs_inode *nfsi = NFS_I(inode); 1690 loff_t cur_isize, new_isize; 1691 unsigned long invalid = 0; 1692 unsigned long now = jiffies; 1693 unsigned long save_cache_validity; 1694 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1695 bool cache_revalidated = true; 1696 1697 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1698 __func__, inode->i_sb->s_id, inode->i_ino, 1699 nfs_display_fhandle_hash(NFS_FH(inode)), 1700 atomic_read(&inode->i_count), fattr->valid); 1701 1702 if (!nfs_fileid_valid(nfsi, fattr)) { 1703 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1704 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1705 NFS_SERVER(inode)->nfs_client->cl_hostname, 1706 inode->i_sb->s_id, (long long)nfsi->fileid, 1707 (long long)fattr->fileid); 1708 goto out_err; 1709 } 1710 1711 /* 1712 * Make sure the inode's type hasn't changed. 1713 */ 1714 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1715 /* 1716 * Big trouble! The inode has become a different object. 1717 */ 1718 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1719 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1720 goto out_err; 1721 } 1722 1723 server = NFS_SERVER(inode); 1724 /* Update the fsid? */ 1725 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1726 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1727 !IS_AUTOMOUNT(inode)) 1728 server->fsid = fattr->fsid; 1729 1730 /* 1731 * Update the read time so we don't revalidate too often. 1732 */ 1733 nfsi->read_cache_jiffies = fattr->time_start; 1734 1735 save_cache_validity = nfsi->cache_validity; 1736 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1737 | NFS_INO_INVALID_ATIME 1738 | NFS_INO_REVAL_FORCED 1739 | NFS_INO_REVAL_PAGECACHE); 1740 1741 /* Do atomic weak cache consistency updates */ 1742 invalid |= nfs_wcc_update_inode(inode, fattr); 1743 1744 if (pnfs_layoutcommit_outstanding(inode)) { 1745 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; 1746 cache_revalidated = false; 1747 } 1748 1749 /* More cache consistency checks */ 1750 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1751 if (inode->i_version != fattr->change_attr) { 1752 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1753 inode->i_sb->s_id, inode->i_ino); 1754 /* Could it be a race with writeback? */ 1755 if (!have_writers) { 1756 invalid |= NFS_INO_INVALID_ATTR 1757 | NFS_INO_INVALID_DATA 1758 | NFS_INO_INVALID_ACCESS 1759 | NFS_INO_INVALID_ACL; 1760 if (S_ISDIR(inode->i_mode)) 1761 nfs_force_lookup_revalidate(inode); 1762 } 1763 inode->i_version = fattr->change_attr; 1764 } 1765 } else { 1766 nfsi->cache_validity |= save_cache_validity; 1767 cache_revalidated = false; 1768 } 1769 1770 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1771 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1772 } else if (server->caps & NFS_CAP_MTIME) { 1773 nfsi->cache_validity |= save_cache_validity & 1774 (NFS_INO_INVALID_ATTR 1775 | NFS_INO_REVAL_FORCED); 1776 cache_revalidated = false; 1777 } 1778 1779 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1780 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1781 } else if (server->caps & NFS_CAP_CTIME) { 1782 nfsi->cache_validity |= save_cache_validity & 1783 (NFS_INO_INVALID_ATTR 1784 | NFS_INO_REVAL_FORCED); 1785 cache_revalidated = false; 1786 } 1787 1788 /* Check if our cached file size is stale */ 1789 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1790 new_isize = nfs_size_to_loff_t(fattr->size); 1791 cur_isize = i_size_read(inode); 1792 if (new_isize != cur_isize) { 1793 /* Do we perhaps have any outstanding writes, or has 1794 * the file grown beyond our last write? */ 1795 if (nfsi->nrequests == 0 || new_isize > cur_isize) { 1796 i_size_write(inode, new_isize); 1797 if (!have_writers) 1798 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1799 } 1800 dprintk("NFS: isize change on server for file %s/%ld " 1801 "(%Ld to %Ld)\n", 1802 inode->i_sb->s_id, 1803 inode->i_ino, 1804 (long long)cur_isize, 1805 (long long)new_isize); 1806 } 1807 } else { 1808 nfsi->cache_validity |= save_cache_validity & 1809 (NFS_INO_INVALID_ATTR 1810 | NFS_INO_REVAL_PAGECACHE 1811 | NFS_INO_REVAL_FORCED); 1812 cache_revalidated = false; 1813 } 1814 1815 1816 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1817 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1818 else if (server->caps & NFS_CAP_ATIME) { 1819 nfsi->cache_validity |= save_cache_validity & 1820 (NFS_INO_INVALID_ATIME 1821 | NFS_INO_REVAL_FORCED); 1822 cache_revalidated = false; 1823 } 1824 1825 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1826 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1827 umode_t newmode = inode->i_mode & S_IFMT; 1828 newmode |= fattr->mode & S_IALLUGO; 1829 inode->i_mode = newmode; 1830 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1831 } 1832 } else if (server->caps & NFS_CAP_MODE) { 1833 nfsi->cache_validity |= save_cache_validity & 1834 (NFS_INO_INVALID_ATTR 1835 | NFS_INO_INVALID_ACCESS 1836 | NFS_INO_INVALID_ACL 1837 | NFS_INO_REVAL_FORCED); 1838 cache_revalidated = false; 1839 } 1840 1841 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1842 if (!uid_eq(inode->i_uid, fattr->uid)) { 1843 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1844 inode->i_uid = fattr->uid; 1845 } 1846 } else if (server->caps & NFS_CAP_OWNER) { 1847 nfsi->cache_validity |= save_cache_validity & 1848 (NFS_INO_INVALID_ATTR 1849 | NFS_INO_INVALID_ACCESS 1850 | NFS_INO_INVALID_ACL 1851 | NFS_INO_REVAL_FORCED); 1852 cache_revalidated = false; 1853 } 1854 1855 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1856 if (!gid_eq(inode->i_gid, fattr->gid)) { 1857 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1858 inode->i_gid = fattr->gid; 1859 } 1860 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1861 nfsi->cache_validity |= save_cache_validity & 1862 (NFS_INO_INVALID_ATTR 1863 | NFS_INO_INVALID_ACCESS 1864 | NFS_INO_INVALID_ACL 1865 | NFS_INO_REVAL_FORCED); 1866 cache_revalidated = false; 1867 } 1868 1869 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1870 if (inode->i_nlink != fattr->nlink) { 1871 invalid |= NFS_INO_INVALID_ATTR; 1872 if (S_ISDIR(inode->i_mode)) 1873 invalid |= NFS_INO_INVALID_DATA; 1874 set_nlink(inode, fattr->nlink); 1875 } 1876 } else if (server->caps & NFS_CAP_NLINK) { 1877 nfsi->cache_validity |= save_cache_validity & 1878 (NFS_INO_INVALID_ATTR 1879 | NFS_INO_REVAL_FORCED); 1880 cache_revalidated = false; 1881 } 1882 1883 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1884 /* 1885 * report the blocks in 512byte units 1886 */ 1887 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1888 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1889 inode->i_blocks = fattr->du.nfs2.blocks; 1890 else 1891 cache_revalidated = false; 1892 1893 /* Update attrtimeo value if we're out of the unstable period */ 1894 if (invalid & NFS_INO_INVALID_ATTR) { 1895 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1896 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1897 nfsi->attrtimeo_timestamp = now; 1898 /* Set barrier to be more recent than all outstanding updates */ 1899 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1900 } else { 1901 if (cache_revalidated) { 1902 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 1903 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1904 nfsi->attrtimeo <<= 1; 1905 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 1906 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1907 } 1908 nfsi->attrtimeo_timestamp = now; 1909 } 1910 /* Set the barrier to be more recent than this fattr */ 1911 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 1912 nfsi->attr_gencount = fattr->gencount; 1913 } 1914 1915 /* Don't declare attrcache up to date if there were no attrs! */ 1916 if (cache_revalidated) 1917 invalid &= ~NFS_INO_INVALID_ATTR; 1918 1919 /* Don't invalidate the data if we were to blame */ 1920 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1921 || S_ISLNK(inode->i_mode))) 1922 invalid &= ~NFS_INO_INVALID_DATA; 1923 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1924 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1925 nfs_set_cache_invalid(inode, invalid); 1926 1927 return 0; 1928 out_err: 1929 /* 1930 * No need to worry about unhashing the dentry, as the 1931 * lookup validation will know that the inode is bad. 1932 * (But we fall through to invalidate the caches.) 1933 */ 1934 nfs_invalidate_inode(inode); 1935 return -ESTALE; 1936 } 1937 1938 struct inode *nfs_alloc_inode(struct super_block *sb) 1939 { 1940 struct nfs_inode *nfsi; 1941 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1942 if (!nfsi) 1943 return NULL; 1944 nfsi->flags = 0UL; 1945 nfsi->cache_validity = 0UL; 1946 #if IS_ENABLED(CONFIG_NFS_V4) 1947 nfsi->nfs4_acl = NULL; 1948 #endif /* CONFIG_NFS_V4 */ 1949 return &nfsi->vfs_inode; 1950 } 1951 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1952 1953 static void nfs_i_callback(struct rcu_head *head) 1954 { 1955 struct inode *inode = container_of(head, struct inode, i_rcu); 1956 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1957 } 1958 1959 void nfs_destroy_inode(struct inode *inode) 1960 { 1961 call_rcu(&inode->i_rcu, nfs_i_callback); 1962 } 1963 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1964 1965 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1966 { 1967 #if IS_ENABLED(CONFIG_NFS_V4) 1968 INIT_LIST_HEAD(&nfsi->open_states); 1969 nfsi->delegation = NULL; 1970 init_rwsem(&nfsi->rwsem); 1971 nfsi->layout = NULL; 1972 #endif 1973 } 1974 1975 static void init_once(void *foo) 1976 { 1977 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1978 1979 inode_init_once(&nfsi->vfs_inode); 1980 INIT_LIST_HEAD(&nfsi->open_files); 1981 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1982 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1983 INIT_LIST_HEAD(&nfsi->commit_info.list); 1984 nfsi->nrequests = 0; 1985 nfsi->commit_info.ncommit = 0; 1986 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1987 init_rwsem(&nfsi->rmdir_sem); 1988 nfs4_init_once(nfsi); 1989 } 1990 1991 static int __init nfs_init_inodecache(void) 1992 { 1993 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1994 sizeof(struct nfs_inode), 1995 0, (SLAB_RECLAIM_ACCOUNT| 1996 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 1997 init_once); 1998 if (nfs_inode_cachep == NULL) 1999 return -ENOMEM; 2000 2001 return 0; 2002 } 2003 2004 static void nfs_destroy_inodecache(void) 2005 { 2006 /* 2007 * Make sure all delayed rcu free inodes are flushed before we 2008 * destroy cache. 2009 */ 2010 rcu_barrier(); 2011 kmem_cache_destroy(nfs_inode_cachep); 2012 } 2013 2014 struct workqueue_struct *nfsiod_workqueue; 2015 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2016 2017 /* 2018 * start up the nfsiod workqueue 2019 */ 2020 static int nfsiod_start(void) 2021 { 2022 struct workqueue_struct *wq; 2023 dprintk("RPC: creating workqueue nfsiod\n"); 2024 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2025 if (wq == NULL) 2026 return -ENOMEM; 2027 nfsiod_workqueue = wq; 2028 return 0; 2029 } 2030 2031 /* 2032 * Destroy the nfsiod workqueue 2033 */ 2034 static void nfsiod_stop(void) 2035 { 2036 struct workqueue_struct *wq; 2037 2038 wq = nfsiod_workqueue; 2039 if (wq == NULL) 2040 return; 2041 nfsiod_workqueue = NULL; 2042 destroy_workqueue(wq); 2043 } 2044 2045 unsigned int nfs_net_id; 2046 EXPORT_SYMBOL_GPL(nfs_net_id); 2047 2048 static int nfs_net_init(struct net *net) 2049 { 2050 nfs_clients_init(net); 2051 return nfs_fs_proc_net_init(net); 2052 } 2053 2054 static void nfs_net_exit(struct net *net) 2055 { 2056 nfs_fs_proc_net_exit(net); 2057 nfs_cleanup_cb_ident_idr(net); 2058 } 2059 2060 static struct pernet_operations nfs_net_ops = { 2061 .init = nfs_net_init, 2062 .exit = nfs_net_exit, 2063 .id = &nfs_net_id, 2064 .size = sizeof(struct nfs_net), 2065 }; 2066 2067 /* 2068 * Initialize NFS 2069 */ 2070 static int __init init_nfs_fs(void) 2071 { 2072 int err; 2073 2074 err = register_pernet_subsys(&nfs_net_ops); 2075 if (err < 0) 2076 goto out9; 2077 2078 err = nfs_fscache_register(); 2079 if (err < 0) 2080 goto out8; 2081 2082 err = nfsiod_start(); 2083 if (err) 2084 goto out7; 2085 2086 err = nfs_fs_proc_init(); 2087 if (err) 2088 goto out6; 2089 2090 err = nfs_init_nfspagecache(); 2091 if (err) 2092 goto out5; 2093 2094 err = nfs_init_inodecache(); 2095 if (err) 2096 goto out4; 2097 2098 err = nfs_init_readpagecache(); 2099 if (err) 2100 goto out3; 2101 2102 err = nfs_init_writepagecache(); 2103 if (err) 2104 goto out2; 2105 2106 err = nfs_init_directcache(); 2107 if (err) 2108 goto out1; 2109 2110 rpc_proc_register(&init_net, &nfs_rpcstat); 2111 2112 err = register_nfs_fs(); 2113 if (err) 2114 goto out0; 2115 2116 return 0; 2117 out0: 2118 rpc_proc_unregister(&init_net, "nfs"); 2119 nfs_destroy_directcache(); 2120 out1: 2121 nfs_destroy_writepagecache(); 2122 out2: 2123 nfs_destroy_readpagecache(); 2124 out3: 2125 nfs_destroy_inodecache(); 2126 out4: 2127 nfs_destroy_nfspagecache(); 2128 out5: 2129 nfs_fs_proc_exit(); 2130 out6: 2131 nfsiod_stop(); 2132 out7: 2133 nfs_fscache_unregister(); 2134 out8: 2135 unregister_pernet_subsys(&nfs_net_ops); 2136 out9: 2137 return err; 2138 } 2139 2140 static void __exit exit_nfs_fs(void) 2141 { 2142 nfs_destroy_directcache(); 2143 nfs_destroy_writepagecache(); 2144 nfs_destroy_readpagecache(); 2145 nfs_destroy_inodecache(); 2146 nfs_destroy_nfspagecache(); 2147 nfs_fscache_unregister(); 2148 unregister_pernet_subsys(&nfs_net_ops); 2149 rpc_proc_unregister(&init_net, "nfs"); 2150 unregister_nfs_fs(); 2151 nfs_fs_proc_exit(); 2152 nfsiod_stop(); 2153 } 2154 2155 /* Not quite true; I just maintain it */ 2156 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2157 MODULE_LICENSE("GPL"); 2158 module_param(enable_ino64, bool, 0644); 2159 2160 module_init(init_nfs_fs) 2161 module_exit(exit_nfs_fs) 2162