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