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