1 /* 2 * linux/fs/nfs/inode.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs inode and superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/sched/signal.h> 19 #include <linux/time.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/string.h> 23 #include <linux/stat.h> 24 #include <linux/errno.h> 25 #include <linux/unistd.h> 26 #include <linux/sunrpc/clnt.h> 27 #include <linux/sunrpc/stats.h> 28 #include <linux/sunrpc/metrics.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/slab.h> 39 #include <linux/compat.h> 40 #include <linux/freezer.h> 41 42 #include <linux/uaccess.h> 43 44 #include "nfs4_fs.h" 45 #include "callback.h" 46 #include "delegation.h" 47 #include "iostat.h" 48 #include "internal.h" 49 #include "fscache.h" 50 #include "pnfs.h" 51 #include "nfs.h" 52 #include "netns.h" 53 54 #include "nfstrace.h" 55 56 #define NFSDBG_FACILITY NFSDBG_VFS 57 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 59 60 /* Default is to see 64-bit inode numbers */ 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 62 63 static void nfs_invalidate_inode(struct inode *); 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 65 66 static struct kmem_cache * nfs_inode_cachep; 67 68 static inline unsigned long 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 70 { 71 return nfs_fileid_to_ino_t(fattr->fileid); 72 } 73 74 static int nfs_wait_killable(int mode) 75 { 76 freezable_schedule_unsafe(); 77 if (signal_pending_state(mode, current)) 78 return -ERESTARTSYS; 79 return 0; 80 } 81 82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 83 { 84 return nfs_wait_killable(mode); 85 } 86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 87 88 int nfs_wait_atomic_killable(atomic_t *p, 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->i_version = 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->i_version = 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 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 739 int err = 0; 740 741 trace_nfs_getattr_enter(inode); 742 /* Flush out writes to the server in order to update c/mtime. */ 743 if (S_ISREG(inode->i_mode)) { 744 err = filemap_write_and_wait(inode->i_mapping); 745 if (err) 746 goto out; 747 } 748 749 /* 750 * We may force a getattr if the user cares about atime. 751 * 752 * Note that we only have to check the vfsmount flags here: 753 * - NFS always sets S_NOATIME by so checking it would give a 754 * bogus result 755 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 756 * no point in checking those. 757 */ 758 if ((path->mnt->mnt_flags & MNT_NOATIME) || 759 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 760 need_atime = 0; 761 762 if (need_atime || nfs_need_revalidate_inode(inode)) { 763 struct nfs_server *server = NFS_SERVER(inode); 764 765 if (!(server->flags & NFS_MOUNT_NOAC)) 766 nfs_readdirplus_parent_cache_miss(path->dentry); 767 else 768 nfs_readdirplus_parent_cache_hit(path->dentry); 769 err = __nfs_revalidate_inode(server, inode); 770 } else 771 nfs_readdirplus_parent_cache_hit(path->dentry); 772 if (!err) { 773 generic_fillattr(inode, stat); 774 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 775 if (S_ISDIR(inode->i_mode)) 776 stat->blksize = NFS_SERVER(inode)->dtsize; 777 } 778 out: 779 trace_nfs_getattr_exit(inode, err); 780 return err; 781 } 782 EXPORT_SYMBOL_GPL(nfs_getattr); 783 784 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 785 { 786 atomic_set(&l_ctx->count, 1); 787 l_ctx->lockowner = current->files; 788 INIT_LIST_HEAD(&l_ctx->list); 789 atomic_set(&l_ctx->io_count, 0); 790 } 791 792 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 793 { 794 struct nfs_lock_context *head = &ctx->lock_context; 795 struct nfs_lock_context *pos = head; 796 797 do { 798 if (pos->lockowner != current->files) 799 continue; 800 atomic_inc(&pos->count); 801 return pos; 802 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 803 return NULL; 804 } 805 806 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 807 { 808 struct nfs_lock_context *res, *new = NULL; 809 struct inode *inode = d_inode(ctx->dentry); 810 811 spin_lock(&inode->i_lock); 812 res = __nfs_find_lock_context(ctx); 813 if (res == NULL) { 814 spin_unlock(&inode->i_lock); 815 new = kmalloc(sizeof(*new), GFP_KERNEL); 816 if (new == NULL) 817 return ERR_PTR(-ENOMEM); 818 nfs_init_lock_context(new); 819 spin_lock(&inode->i_lock); 820 res = __nfs_find_lock_context(ctx); 821 if (res == NULL) { 822 list_add_tail(&new->list, &ctx->lock_context.list); 823 new->open_context = ctx; 824 res = new; 825 new = NULL; 826 } 827 } 828 spin_unlock(&inode->i_lock); 829 kfree(new); 830 return res; 831 } 832 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 833 834 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 835 { 836 struct nfs_open_context *ctx = l_ctx->open_context; 837 struct inode *inode = d_inode(ctx->dentry); 838 839 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 840 return; 841 list_del(&l_ctx->list); 842 spin_unlock(&inode->i_lock); 843 kfree(l_ctx); 844 } 845 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 846 847 /** 848 * nfs_close_context - Common close_context() routine NFSv2/v3 849 * @ctx: pointer to context 850 * @is_sync: is this a synchronous close 851 * 852 * Ensure that the attributes are up to date if we're mounted 853 * with close-to-open semantics and we have cached data that will 854 * need to be revalidated on open. 855 */ 856 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 857 { 858 struct nfs_inode *nfsi; 859 struct inode *inode; 860 struct nfs_server *server; 861 862 if (!(ctx->mode & FMODE_WRITE)) 863 return; 864 if (!is_sync) 865 return; 866 inode = d_inode(ctx->dentry); 867 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 868 return; 869 nfsi = NFS_I(inode); 870 if (inode->i_mapping->nrpages == 0) 871 return; 872 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 873 return; 874 if (!list_empty(&nfsi->open_files)) 875 return; 876 server = NFS_SERVER(inode); 877 if (server->flags & NFS_MOUNT_NOCTO) 878 return; 879 nfs_revalidate_inode(server, inode); 880 } 881 EXPORT_SYMBOL_GPL(nfs_close_context); 882 883 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 884 fmode_t f_mode, 885 struct file *filp) 886 { 887 struct nfs_open_context *ctx; 888 struct rpc_cred *cred = rpc_lookup_cred(); 889 if (IS_ERR(cred)) 890 return ERR_CAST(cred); 891 892 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 893 if (!ctx) { 894 put_rpccred(cred); 895 return ERR_PTR(-ENOMEM); 896 } 897 nfs_sb_active(dentry->d_sb); 898 ctx->dentry = dget(dentry); 899 ctx->cred = cred; 900 ctx->state = NULL; 901 ctx->mode = f_mode; 902 ctx->flags = 0; 903 ctx->error = 0; 904 ctx->flock_owner = (fl_owner_t)filp; 905 nfs_init_lock_context(&ctx->lock_context); 906 ctx->lock_context.open_context = ctx; 907 INIT_LIST_HEAD(&ctx->list); 908 ctx->mdsthreshold = NULL; 909 return ctx; 910 } 911 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 912 913 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 914 { 915 if (ctx != NULL) 916 atomic_inc(&ctx->lock_context.count); 917 return ctx; 918 } 919 EXPORT_SYMBOL_GPL(get_nfs_open_context); 920 921 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 922 { 923 struct inode *inode = d_inode(ctx->dentry); 924 struct super_block *sb = ctx->dentry->d_sb; 925 926 if (!list_empty(&ctx->list)) { 927 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 928 return; 929 list_del(&ctx->list); 930 spin_unlock(&inode->i_lock); 931 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 932 return; 933 if (inode != NULL) 934 NFS_PROTO(inode)->close_context(ctx, is_sync); 935 if (ctx->cred != NULL) 936 put_rpccred(ctx->cred); 937 dput(ctx->dentry); 938 nfs_sb_deactive(sb); 939 kfree(ctx->mdsthreshold); 940 kfree(ctx); 941 } 942 943 void put_nfs_open_context(struct nfs_open_context *ctx) 944 { 945 __put_nfs_open_context(ctx, 0); 946 } 947 EXPORT_SYMBOL_GPL(put_nfs_open_context); 948 949 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 950 { 951 __put_nfs_open_context(ctx, 1); 952 } 953 954 /* 955 * Ensure that mmap has a recent RPC credential for use when writing out 956 * shared pages 957 */ 958 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 959 { 960 struct inode *inode = d_inode(ctx->dentry); 961 struct nfs_inode *nfsi = NFS_I(inode); 962 963 spin_lock(&inode->i_lock); 964 if (ctx->mode & FMODE_WRITE) 965 list_add(&ctx->list, &nfsi->open_files); 966 else 967 list_add_tail(&ctx->list, &nfsi->open_files); 968 spin_unlock(&inode->i_lock); 969 } 970 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 971 972 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 973 { 974 filp->private_data = get_nfs_open_context(ctx); 975 if (list_empty(&ctx->list)) 976 nfs_inode_attach_open_context(ctx); 977 } 978 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 979 980 /* 981 * Given an inode, search for an open context with the desired characteristics 982 */ 983 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 984 { 985 struct nfs_inode *nfsi = NFS_I(inode); 986 struct nfs_open_context *pos, *ctx = NULL; 987 988 spin_lock(&inode->i_lock); 989 list_for_each_entry(pos, &nfsi->open_files, list) { 990 if (cred != NULL && pos->cred != cred) 991 continue; 992 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 993 continue; 994 ctx = get_nfs_open_context(pos); 995 break; 996 } 997 spin_unlock(&inode->i_lock); 998 return ctx; 999 } 1000 1001 void nfs_file_clear_open_context(struct file *filp) 1002 { 1003 struct nfs_open_context *ctx = nfs_file_open_context(filp); 1004 1005 if (ctx) { 1006 struct inode *inode = d_inode(ctx->dentry); 1007 1008 /* 1009 * We fatal error on write before. Try to writeback 1010 * every page again. 1011 */ 1012 if (ctx->error < 0) 1013 invalidate_inode_pages2(inode->i_mapping); 1014 filp->private_data = NULL; 1015 spin_lock(&inode->i_lock); 1016 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 1017 spin_unlock(&inode->i_lock); 1018 put_nfs_open_context_sync(ctx); 1019 } 1020 } 1021 1022 /* 1023 * These allocate and release file read/write context information. 1024 */ 1025 int nfs_open(struct inode *inode, struct file *filp) 1026 { 1027 struct nfs_open_context *ctx; 1028 1029 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); 1030 if (IS_ERR(ctx)) 1031 return PTR_ERR(ctx); 1032 nfs_file_set_open_context(filp, ctx); 1033 put_nfs_open_context(ctx); 1034 nfs_fscache_open_file(inode, filp); 1035 return 0; 1036 } 1037 1038 /* 1039 * This function is called whenever some part of NFS notices that 1040 * the cached attributes have to be refreshed. 1041 */ 1042 int 1043 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1044 { 1045 int status = -ESTALE; 1046 struct nfs4_label *label = NULL; 1047 struct nfs_fattr *fattr = NULL; 1048 struct nfs_inode *nfsi = NFS_I(inode); 1049 1050 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 1051 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 1052 1053 trace_nfs_revalidate_inode_enter(inode); 1054 1055 if (is_bad_inode(inode)) 1056 goto out; 1057 if (NFS_STALE(inode)) 1058 goto out; 1059 1060 /* pNFS: Attributes aren't updated until we layoutcommit */ 1061 if (S_ISREG(inode->i_mode)) { 1062 status = pnfs_sync_inode(inode, false); 1063 if (status) 1064 goto out; 1065 } 1066 1067 status = -ENOMEM; 1068 fattr = nfs_alloc_fattr(); 1069 if (fattr == NULL) 1070 goto out; 1071 1072 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1073 1074 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 1075 if (IS_ERR(label)) { 1076 status = PTR_ERR(label); 1077 goto out; 1078 } 1079 1080 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 1081 if (status != 0) { 1082 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1083 inode->i_sb->s_id, 1084 (unsigned long long)NFS_FILEID(inode), status); 1085 if (status == -ESTALE) { 1086 nfs_zap_caches(inode); 1087 if (!S_ISDIR(inode->i_mode)) 1088 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 1089 } 1090 goto err_out; 1091 } 1092 1093 status = nfs_refresh_inode(inode, fattr); 1094 if (status) { 1095 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1096 inode->i_sb->s_id, 1097 (unsigned long long)NFS_FILEID(inode), status); 1098 goto err_out; 1099 } 1100 1101 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1102 nfs_zap_acl_cache(inode); 1103 1104 nfs_setsecurity(inode, fattr, label); 1105 1106 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1107 inode->i_sb->s_id, 1108 (unsigned long long)NFS_FILEID(inode)); 1109 1110 err_out: 1111 nfs4_label_free(label); 1112 out: 1113 nfs_free_fattr(fattr); 1114 trace_nfs_revalidate_inode_exit(inode, status); 1115 return status; 1116 } 1117 1118 int nfs_attribute_cache_expired(struct inode *inode) 1119 { 1120 if (nfs_have_delegated_attributes(inode)) 1121 return 0; 1122 return nfs_attribute_timeout(inode); 1123 } 1124 1125 /** 1126 * nfs_revalidate_inode - Revalidate the inode attributes 1127 * @server - pointer to nfs_server struct 1128 * @inode - pointer to inode struct 1129 * 1130 * Updates inode attribute information by retrieving the data from the server. 1131 */ 1132 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1133 { 1134 if (!nfs_need_revalidate_inode(inode)) 1135 return NFS_STALE(inode) ? -ESTALE : 0; 1136 return __nfs_revalidate_inode(server, inode); 1137 } 1138 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1139 1140 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1141 { 1142 struct nfs_inode *nfsi = NFS_I(inode); 1143 int ret; 1144 1145 if (mapping->nrpages != 0) { 1146 if (S_ISREG(inode->i_mode)) { 1147 unmap_mapping_range(mapping, 0, 0, 0); 1148 ret = nfs_sync_mapping(mapping); 1149 if (ret < 0) 1150 return ret; 1151 } 1152 ret = invalidate_inode_pages2(mapping); 1153 if (ret < 0) 1154 return ret; 1155 } 1156 if (S_ISDIR(inode->i_mode)) { 1157 spin_lock(&inode->i_lock); 1158 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1159 spin_unlock(&inode->i_lock); 1160 } 1161 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1162 nfs_fscache_wait_on_invalidate(inode); 1163 1164 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1165 inode->i_sb->s_id, 1166 (unsigned long long)NFS_FILEID(inode)); 1167 return 0; 1168 } 1169 1170 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1171 { 1172 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) || 1173 NFS_STALE(inode); 1174 } 1175 1176 int nfs_revalidate_mapping_rcu(struct inode *inode) 1177 { 1178 struct nfs_inode *nfsi = NFS_I(inode); 1179 unsigned long *bitlock = &nfsi->flags; 1180 int ret = 0; 1181 1182 if (IS_SWAPFILE(inode)) 1183 goto out; 1184 if (nfs_mapping_need_revalidate_inode(inode)) { 1185 ret = -ECHILD; 1186 goto out; 1187 } 1188 spin_lock(&inode->i_lock); 1189 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1190 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1191 ret = -ECHILD; 1192 spin_unlock(&inode->i_lock); 1193 out: 1194 return ret; 1195 } 1196 1197 /** 1198 * nfs_revalidate_mapping - Revalidate the pagecache 1199 * @inode - pointer to host inode 1200 * @mapping - pointer to mapping 1201 */ 1202 int nfs_revalidate_mapping(struct inode *inode, 1203 struct address_space *mapping) 1204 { 1205 struct nfs_inode *nfsi = NFS_I(inode); 1206 unsigned long *bitlock = &nfsi->flags; 1207 int ret = 0; 1208 1209 /* swapfiles are not supposed to be shared. */ 1210 if (IS_SWAPFILE(inode)) 1211 goto out; 1212 1213 if (nfs_mapping_need_revalidate_inode(inode)) { 1214 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1215 if (ret < 0) 1216 goto out; 1217 } 1218 1219 /* 1220 * We must clear NFS_INO_INVALID_DATA first to ensure that 1221 * invalidations that come in while we're shooting down the mappings 1222 * are respected. But, that leaves a race window where one revalidator 1223 * can clear the flag, and then another checks it before the mapping 1224 * gets invalidated. Fix that by serializing access to this part of 1225 * the function. 1226 * 1227 * At the same time, we need to allow other tasks to see whether we 1228 * might be in the middle of invalidating the pages, so we only set 1229 * the bit lock here if it looks like we're going to be doing that. 1230 */ 1231 for (;;) { 1232 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1233 nfs_wait_bit_killable, TASK_KILLABLE); 1234 if (ret) 1235 goto out; 1236 spin_lock(&inode->i_lock); 1237 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1238 spin_unlock(&inode->i_lock); 1239 continue; 1240 } 1241 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1242 break; 1243 spin_unlock(&inode->i_lock); 1244 goto out; 1245 } 1246 1247 set_bit(NFS_INO_INVALIDATING, bitlock); 1248 smp_wmb(); 1249 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1250 spin_unlock(&inode->i_lock); 1251 trace_nfs_invalidate_mapping_enter(inode); 1252 ret = nfs_invalidate_mapping(inode, mapping); 1253 trace_nfs_invalidate_mapping_exit(inode, ret); 1254 1255 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1256 smp_mb__after_atomic(); 1257 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1258 out: 1259 return ret; 1260 } 1261 1262 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1263 { 1264 struct inode *inode = &nfsi->vfs_inode; 1265 1266 assert_spin_locked(&inode->i_lock); 1267 1268 if (!S_ISREG(inode->i_mode)) 1269 return false; 1270 if (list_empty(&nfsi->open_files)) 1271 return false; 1272 /* Note: This relies on nfsi->open_files being ordered with writers 1273 * being placed at the head of the list. 1274 * See nfs_inode_attach_open_context() 1275 */ 1276 return (list_first_entry(&nfsi->open_files, 1277 struct nfs_open_context, 1278 list)->mode & FMODE_WRITE) == FMODE_WRITE; 1279 } 1280 1281 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1282 { 1283 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1284 } 1285 1286 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1287 { 1288 unsigned long ret = 0; 1289 1290 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1291 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1292 && inode->i_version == fattr->pre_change_attr) { 1293 inode->i_version = fattr->change_attr; 1294 if (S_ISDIR(inode->i_mode)) 1295 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1296 ret |= NFS_INO_INVALID_ATTR; 1297 } 1298 /* If we have atomic WCC data, we may update some attributes */ 1299 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1300 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1301 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1302 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1303 ret |= NFS_INO_INVALID_ATTR; 1304 } 1305 1306 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1307 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1308 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1309 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1310 if (S_ISDIR(inode->i_mode)) 1311 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1312 ret |= NFS_INO_INVALID_ATTR; 1313 } 1314 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1315 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1316 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1317 && !nfs_have_writebacks(inode)) { 1318 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1319 ret |= NFS_INO_INVALID_ATTR; 1320 } 1321 1322 return ret; 1323 } 1324 1325 /** 1326 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1327 * @inode - pointer to inode 1328 * @fattr - updated attributes 1329 * 1330 * Verifies the attribute cache. If we have just changed the attributes, 1331 * so that fattr carries weak cache consistency data, then it may 1332 * also update the ctime/mtime/change_attribute. 1333 */ 1334 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1335 { 1336 struct nfs_inode *nfsi = NFS_I(inode); 1337 loff_t cur_size, new_isize; 1338 unsigned long invalid = 0; 1339 1340 1341 if (nfs_have_delegated_attributes(inode)) 1342 return 0; 1343 /* Has the inode gone and changed behind our back? */ 1344 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1345 return -ESTALE; 1346 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1347 return -ESTALE; 1348 1349 if (!nfs_file_has_buffered_writers(nfsi)) { 1350 /* Verify a few of the more important attributes */ 1351 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr) 1352 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE; 1353 1354 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1355 invalid |= NFS_INO_INVALID_ATTR; 1356 1357 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime)) 1358 invalid |= NFS_INO_INVALID_ATTR; 1359 1360 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1361 cur_size = i_size_read(inode); 1362 new_isize = nfs_size_to_loff_t(fattr->size); 1363 if (cur_size != new_isize) 1364 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1365 } 1366 } 1367 1368 /* Have any file permissions changed? */ 1369 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1370 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1371 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1372 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1373 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1374 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1375 1376 /* Has the link count changed? */ 1377 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1378 invalid |= NFS_INO_INVALID_ATTR; 1379 1380 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1381 invalid |= NFS_INO_INVALID_ATIME; 1382 1383 if (invalid != 0) 1384 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED); 1385 1386 nfsi->read_cache_jiffies = fattr->time_start; 1387 return 0; 1388 } 1389 1390 static atomic_long_t nfs_attr_generation_counter; 1391 1392 static unsigned long nfs_read_attr_generation_counter(void) 1393 { 1394 return atomic_long_read(&nfs_attr_generation_counter); 1395 } 1396 1397 unsigned long nfs_inc_attr_generation_counter(void) 1398 { 1399 return atomic_long_inc_return(&nfs_attr_generation_counter); 1400 } 1401 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1402 1403 void nfs_fattr_init(struct nfs_fattr *fattr) 1404 { 1405 fattr->valid = 0; 1406 fattr->time_start = jiffies; 1407 fattr->gencount = nfs_inc_attr_generation_counter(); 1408 fattr->owner_name = NULL; 1409 fattr->group_name = NULL; 1410 } 1411 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1412 1413 /** 1414 * nfs_fattr_set_barrier 1415 * @fattr: attributes 1416 * 1417 * Used to set a barrier after an attribute was updated. This 1418 * barrier ensures that older attributes from RPC calls that may 1419 * have raced with our update cannot clobber these new values. 1420 * Note that you are still responsible for ensuring that other 1421 * operations which change the attribute on the server do not 1422 * collide. 1423 */ 1424 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1425 { 1426 fattr->gencount = nfs_inc_attr_generation_counter(); 1427 } 1428 1429 struct nfs_fattr *nfs_alloc_fattr(void) 1430 { 1431 struct nfs_fattr *fattr; 1432 1433 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1434 if (fattr != NULL) 1435 nfs_fattr_init(fattr); 1436 return fattr; 1437 } 1438 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1439 1440 struct nfs_fh *nfs_alloc_fhandle(void) 1441 { 1442 struct nfs_fh *fh; 1443 1444 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1445 if (fh != NULL) 1446 fh->size = 0; 1447 return fh; 1448 } 1449 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1450 1451 #ifdef NFS_DEBUG 1452 /* 1453 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1454 * in the same way that wireshark does 1455 * 1456 * @fh: file handle 1457 * 1458 * For debugging only. 1459 */ 1460 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1461 { 1462 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1463 * not on the result */ 1464 return nfs_fhandle_hash(fh); 1465 } 1466 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1467 1468 /* 1469 * _nfs_display_fhandle - display an NFS file handle on the console 1470 * 1471 * @fh: file handle to display 1472 * @caption: display caption 1473 * 1474 * For debugging only. 1475 */ 1476 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1477 { 1478 unsigned short i; 1479 1480 if (fh == NULL || fh->size == 0) { 1481 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1482 return; 1483 } 1484 1485 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1486 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1487 for (i = 0; i < fh->size; i += 16) { 1488 __be32 *pos = (__be32 *)&fh->data[i]; 1489 1490 switch ((fh->size - i - 1) >> 2) { 1491 case 0: 1492 printk(KERN_DEFAULT " %08x\n", 1493 be32_to_cpup(pos)); 1494 break; 1495 case 1: 1496 printk(KERN_DEFAULT " %08x %08x\n", 1497 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1498 break; 1499 case 2: 1500 printk(KERN_DEFAULT " %08x %08x %08x\n", 1501 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1502 be32_to_cpup(pos + 2)); 1503 break; 1504 default: 1505 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1506 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1507 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1508 } 1509 } 1510 } 1511 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1512 #endif 1513 1514 /** 1515 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1516 * @inode - pointer to inode 1517 * @fattr - attributes 1518 * 1519 * Attempt to divine whether or not an RPC call reply carrying stale 1520 * attributes got scheduled after another call carrying updated ones. 1521 * 1522 * To do so, the function first assumes that a more recent ctime means 1523 * that the attributes in fattr are newer, however it also attempt to 1524 * catch the case where ctime either didn't change, or went backwards 1525 * (if someone reset the clock on the server) by looking at whether 1526 * or not this RPC call was started after the inode was last updated. 1527 * Note also the check for wraparound of 'attr_gencount' 1528 * 1529 * The function returns 'true' if it thinks the attributes in 'fattr' are 1530 * more recent than the ones cached in the inode. 1531 * 1532 */ 1533 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1534 { 1535 const struct nfs_inode *nfsi = NFS_I(inode); 1536 1537 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1538 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1539 } 1540 1541 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1542 { 1543 int ret; 1544 1545 trace_nfs_refresh_inode_enter(inode); 1546 1547 if (nfs_inode_attrs_need_update(inode, fattr)) 1548 ret = nfs_update_inode(inode, fattr); 1549 else 1550 ret = nfs_check_inode_attributes(inode, fattr); 1551 1552 trace_nfs_refresh_inode_exit(inode, ret); 1553 return ret; 1554 } 1555 1556 /** 1557 * nfs_refresh_inode - try to update the inode attribute cache 1558 * @inode - pointer to inode 1559 * @fattr - updated attributes 1560 * 1561 * Check that an RPC call that returned attributes has not overlapped with 1562 * other recent updates of the inode metadata, then decide whether it is 1563 * safe to do a full update of the inode attributes, or whether just to 1564 * call nfs_check_inode_attributes. 1565 */ 1566 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1567 { 1568 int status; 1569 1570 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1571 return 0; 1572 spin_lock(&inode->i_lock); 1573 status = nfs_refresh_inode_locked(inode, fattr); 1574 spin_unlock(&inode->i_lock); 1575 1576 return status; 1577 } 1578 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1579 1580 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1581 { 1582 unsigned long invalid = NFS_INO_INVALID_ATTR; 1583 1584 if (S_ISDIR(inode->i_mode)) 1585 invalid |= NFS_INO_INVALID_DATA; 1586 nfs_set_cache_invalid(inode, invalid); 1587 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1588 return 0; 1589 return nfs_refresh_inode_locked(inode, fattr); 1590 } 1591 1592 /** 1593 * nfs_post_op_update_inode - try to update the inode attribute cache 1594 * @inode - pointer to inode 1595 * @fattr - updated attributes 1596 * 1597 * After an operation that has changed the inode metadata, mark the 1598 * attribute cache as being invalid, then try to update it. 1599 * 1600 * NB: if the server didn't return any post op attributes, this 1601 * function will force the retrieval of attributes before the next 1602 * NFS request. Thus it should be used only for operations that 1603 * are expected to change one or more attributes, to avoid 1604 * unnecessary NFS requests and trips through nfs_update_inode(). 1605 */ 1606 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1607 { 1608 int status; 1609 1610 spin_lock(&inode->i_lock); 1611 nfs_fattr_set_barrier(fattr); 1612 status = nfs_post_op_update_inode_locked(inode, fattr); 1613 spin_unlock(&inode->i_lock); 1614 1615 return status; 1616 } 1617 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1618 1619 /** 1620 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1621 * @inode - pointer to inode 1622 * @fattr - updated attributes 1623 * 1624 * After an operation that has changed the inode metadata, mark the 1625 * attribute cache as being invalid, then try to update it. Fake up 1626 * weak cache consistency data, if none exist. 1627 * 1628 * This function is mainly designed to be used by the ->write_done() functions. 1629 */ 1630 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1631 { 1632 int status; 1633 1634 /* Don't do a WCC update if these attributes are already stale */ 1635 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1636 !nfs_inode_attrs_need_update(inode, fattr)) { 1637 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1638 | NFS_ATTR_FATTR_PRESIZE 1639 | NFS_ATTR_FATTR_PREMTIME 1640 | NFS_ATTR_FATTR_PRECTIME); 1641 goto out_noforce; 1642 } 1643 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1644 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1645 fattr->pre_change_attr = inode->i_version; 1646 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1647 } 1648 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1649 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1650 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1651 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1652 } 1653 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1654 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1655 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1656 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1657 } 1658 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1659 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1660 fattr->pre_size = i_size_read(inode); 1661 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1662 } 1663 out_noforce: 1664 status = nfs_post_op_update_inode_locked(inode, fattr); 1665 return status; 1666 } 1667 1668 /** 1669 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1670 * @inode - pointer to inode 1671 * @fattr - updated attributes 1672 * 1673 * After an operation that has changed the inode metadata, mark the 1674 * attribute cache as being invalid, then try to update it. Fake up 1675 * weak cache consistency data, if none exist. 1676 * 1677 * This function is mainly designed to be used by the ->write_done() functions. 1678 */ 1679 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1680 { 1681 int status; 1682 1683 spin_lock(&inode->i_lock); 1684 nfs_fattr_set_barrier(fattr); 1685 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1686 spin_unlock(&inode->i_lock); 1687 return status; 1688 } 1689 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1690 1691 1692 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1693 struct nfs_fattr *fattr) 1694 { 1695 bool ret1 = true, ret2 = true; 1696 1697 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1698 ret1 = (nfsi->fileid == fattr->fileid); 1699 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1700 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1701 return ret1 || ret2; 1702 } 1703 1704 /* 1705 * Many nfs protocol calls return the new file attributes after 1706 * an operation. Here we update the inode to reflect the state 1707 * of the server's inode. 1708 * 1709 * This is a bit tricky because we have to make sure all dirty pages 1710 * have been sent off to the server before calling invalidate_inode_pages. 1711 * To make sure no other process adds more write requests while we try 1712 * our best to flush them, we make them sleep during the attribute refresh. 1713 * 1714 * A very similar scenario holds for the dir cache. 1715 */ 1716 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1717 { 1718 struct nfs_server *server; 1719 struct nfs_inode *nfsi = NFS_I(inode); 1720 loff_t cur_isize, new_isize; 1721 unsigned long invalid = 0; 1722 unsigned long now = jiffies; 1723 unsigned long save_cache_validity; 1724 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1725 bool cache_revalidated = true; 1726 1727 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1728 __func__, inode->i_sb->s_id, inode->i_ino, 1729 nfs_display_fhandle_hash(NFS_FH(inode)), 1730 atomic_read(&inode->i_count), fattr->valid); 1731 1732 if (!nfs_fileid_valid(nfsi, fattr)) { 1733 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1734 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1735 NFS_SERVER(inode)->nfs_client->cl_hostname, 1736 inode->i_sb->s_id, (long long)nfsi->fileid, 1737 (long long)fattr->fileid); 1738 goto out_err; 1739 } 1740 1741 /* 1742 * Make sure the inode's type hasn't changed. 1743 */ 1744 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1745 /* 1746 * Big trouble! The inode has become a different object. 1747 */ 1748 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1749 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1750 goto out_err; 1751 } 1752 1753 server = NFS_SERVER(inode); 1754 /* Update the fsid? */ 1755 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1756 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1757 !IS_AUTOMOUNT(inode)) 1758 server->fsid = fattr->fsid; 1759 1760 /* 1761 * Update the read time so we don't revalidate too often. 1762 */ 1763 nfsi->read_cache_jiffies = fattr->time_start; 1764 1765 save_cache_validity = nfsi->cache_validity; 1766 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1767 | NFS_INO_INVALID_ATIME 1768 | NFS_INO_REVAL_FORCED 1769 | NFS_INO_REVAL_PAGECACHE); 1770 1771 /* Do atomic weak cache consistency updates */ 1772 invalid |= nfs_wcc_update_inode(inode, fattr); 1773 1774 if (pnfs_layoutcommit_outstanding(inode)) { 1775 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; 1776 cache_revalidated = false; 1777 } 1778 1779 /* More cache consistency checks */ 1780 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1781 if (inode->i_version != fattr->change_attr) { 1782 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1783 inode->i_sb->s_id, inode->i_ino); 1784 /* Could it be a race with writeback? */ 1785 if (!have_writers) { 1786 invalid |= NFS_INO_INVALID_ATTR 1787 | NFS_INO_INVALID_DATA 1788 | NFS_INO_INVALID_ACCESS 1789 | NFS_INO_INVALID_ACL; 1790 if (S_ISDIR(inode->i_mode)) 1791 nfs_force_lookup_revalidate(inode); 1792 } 1793 inode->i_version = fattr->change_attr; 1794 } 1795 } else { 1796 nfsi->cache_validity |= save_cache_validity; 1797 cache_revalidated = false; 1798 } 1799 1800 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1801 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1802 } else if (server->caps & NFS_CAP_MTIME) { 1803 nfsi->cache_validity |= save_cache_validity & 1804 (NFS_INO_INVALID_ATTR 1805 | NFS_INO_REVAL_FORCED); 1806 cache_revalidated = false; 1807 } 1808 1809 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1810 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1811 } else if (server->caps & NFS_CAP_CTIME) { 1812 nfsi->cache_validity |= save_cache_validity & 1813 (NFS_INO_INVALID_ATTR 1814 | NFS_INO_REVAL_FORCED); 1815 cache_revalidated = false; 1816 } 1817 1818 /* Check if our cached file size is stale */ 1819 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1820 new_isize = nfs_size_to_loff_t(fattr->size); 1821 cur_isize = i_size_read(inode); 1822 if (new_isize != cur_isize) { 1823 /* Do we perhaps have any outstanding writes, or has 1824 * the file grown beyond our last write? */ 1825 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { 1826 i_size_write(inode, new_isize); 1827 if (!have_writers) 1828 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1829 } 1830 dprintk("NFS: isize change on server for file %s/%ld " 1831 "(%Ld to %Ld)\n", 1832 inode->i_sb->s_id, 1833 inode->i_ino, 1834 (long long)cur_isize, 1835 (long long)new_isize); 1836 } 1837 } else { 1838 nfsi->cache_validity |= save_cache_validity & 1839 (NFS_INO_INVALID_ATTR 1840 | NFS_INO_REVAL_PAGECACHE 1841 | NFS_INO_REVAL_FORCED); 1842 cache_revalidated = false; 1843 } 1844 1845 1846 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1847 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1848 else if (server->caps & NFS_CAP_ATIME) { 1849 nfsi->cache_validity |= save_cache_validity & 1850 (NFS_INO_INVALID_ATIME 1851 | NFS_INO_REVAL_FORCED); 1852 cache_revalidated = false; 1853 } 1854 1855 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1856 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1857 umode_t newmode = inode->i_mode & S_IFMT; 1858 newmode |= fattr->mode & S_IALLUGO; 1859 inode->i_mode = newmode; 1860 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1861 } 1862 } else if (server->caps & NFS_CAP_MODE) { 1863 nfsi->cache_validity |= save_cache_validity & 1864 (NFS_INO_INVALID_ATTR 1865 | NFS_INO_INVALID_ACCESS 1866 | NFS_INO_INVALID_ACL 1867 | NFS_INO_REVAL_FORCED); 1868 cache_revalidated = false; 1869 } 1870 1871 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1872 if (!uid_eq(inode->i_uid, fattr->uid)) { 1873 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1874 inode->i_uid = fattr->uid; 1875 } 1876 } else if (server->caps & NFS_CAP_OWNER) { 1877 nfsi->cache_validity |= save_cache_validity & 1878 (NFS_INO_INVALID_ATTR 1879 | NFS_INO_INVALID_ACCESS 1880 | NFS_INO_INVALID_ACL 1881 | NFS_INO_REVAL_FORCED); 1882 cache_revalidated = false; 1883 } 1884 1885 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1886 if (!gid_eq(inode->i_gid, fattr->gid)) { 1887 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1888 inode->i_gid = fattr->gid; 1889 } 1890 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1891 nfsi->cache_validity |= save_cache_validity & 1892 (NFS_INO_INVALID_ATTR 1893 | NFS_INO_INVALID_ACCESS 1894 | NFS_INO_INVALID_ACL 1895 | NFS_INO_REVAL_FORCED); 1896 cache_revalidated = false; 1897 } 1898 1899 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1900 if (inode->i_nlink != fattr->nlink) { 1901 invalid |= NFS_INO_INVALID_ATTR; 1902 if (S_ISDIR(inode->i_mode)) 1903 invalid |= NFS_INO_INVALID_DATA; 1904 set_nlink(inode, fattr->nlink); 1905 } 1906 } else if (server->caps & NFS_CAP_NLINK) { 1907 nfsi->cache_validity |= save_cache_validity & 1908 (NFS_INO_INVALID_ATTR 1909 | NFS_INO_REVAL_FORCED); 1910 cache_revalidated = false; 1911 } 1912 1913 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1914 /* 1915 * report the blocks in 512byte units 1916 */ 1917 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1918 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1919 inode->i_blocks = fattr->du.nfs2.blocks; 1920 else 1921 cache_revalidated = false; 1922 1923 /* Update attrtimeo value if we're out of the unstable period */ 1924 if (invalid & NFS_INO_INVALID_ATTR) { 1925 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1926 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1927 nfsi->attrtimeo_timestamp = now; 1928 /* Set barrier to be more recent than all outstanding updates */ 1929 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1930 } else { 1931 if (cache_revalidated) { 1932 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 1933 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1934 nfsi->attrtimeo <<= 1; 1935 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 1936 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1937 } 1938 nfsi->attrtimeo_timestamp = now; 1939 } 1940 /* Set the barrier to be more recent than this fattr */ 1941 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 1942 nfsi->attr_gencount = fattr->gencount; 1943 } 1944 1945 /* Don't declare attrcache up to date if there were no attrs! */ 1946 if (cache_revalidated) 1947 invalid &= ~NFS_INO_INVALID_ATTR; 1948 1949 /* Don't invalidate the data if we were to blame */ 1950 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1951 || S_ISLNK(inode->i_mode))) 1952 invalid &= ~NFS_INO_INVALID_DATA; 1953 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1954 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1955 nfs_set_cache_invalid(inode, invalid); 1956 1957 return 0; 1958 out_err: 1959 /* 1960 * No need to worry about unhashing the dentry, as the 1961 * lookup validation will know that the inode is bad. 1962 * (But we fall through to invalidate the caches.) 1963 */ 1964 nfs_invalidate_inode(inode); 1965 return -ESTALE; 1966 } 1967 1968 struct inode *nfs_alloc_inode(struct super_block *sb) 1969 { 1970 struct nfs_inode *nfsi; 1971 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1972 if (!nfsi) 1973 return NULL; 1974 nfsi->flags = 0UL; 1975 nfsi->cache_validity = 0UL; 1976 #if IS_ENABLED(CONFIG_NFS_V4) 1977 nfsi->nfs4_acl = NULL; 1978 #endif /* CONFIG_NFS_V4 */ 1979 return &nfsi->vfs_inode; 1980 } 1981 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1982 1983 static void nfs_i_callback(struct rcu_head *head) 1984 { 1985 struct inode *inode = container_of(head, struct inode, i_rcu); 1986 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1987 } 1988 1989 void nfs_destroy_inode(struct inode *inode) 1990 { 1991 call_rcu(&inode->i_rcu, nfs_i_callback); 1992 } 1993 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1994 1995 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1996 { 1997 #if IS_ENABLED(CONFIG_NFS_V4) 1998 INIT_LIST_HEAD(&nfsi->open_states); 1999 nfsi->delegation = NULL; 2000 init_rwsem(&nfsi->rwsem); 2001 nfsi->layout = NULL; 2002 #endif 2003 } 2004 2005 static void init_once(void *foo) 2006 { 2007 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 2008 2009 inode_init_once(&nfsi->vfs_inode); 2010 INIT_LIST_HEAD(&nfsi->open_files); 2011 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 2012 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 2013 INIT_LIST_HEAD(&nfsi->commit_info.list); 2014 atomic_long_set(&nfsi->nrequests, 0); 2015 atomic_long_set(&nfsi->commit_info.ncommit, 0); 2016 atomic_set(&nfsi->commit_info.rpcs_out, 0); 2017 init_rwsem(&nfsi->rmdir_sem); 2018 mutex_init(&nfsi->commit_mutex); 2019 nfs4_init_once(nfsi); 2020 } 2021 2022 static int __init nfs_init_inodecache(void) 2023 { 2024 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 2025 sizeof(struct nfs_inode), 2026 0, (SLAB_RECLAIM_ACCOUNT| 2027 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 2028 init_once); 2029 if (nfs_inode_cachep == NULL) 2030 return -ENOMEM; 2031 2032 return 0; 2033 } 2034 2035 static void nfs_destroy_inodecache(void) 2036 { 2037 /* 2038 * Make sure all delayed rcu free inodes are flushed before we 2039 * destroy cache. 2040 */ 2041 rcu_barrier(); 2042 kmem_cache_destroy(nfs_inode_cachep); 2043 } 2044 2045 struct workqueue_struct *nfsiod_workqueue; 2046 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2047 2048 /* 2049 * start up the nfsiod workqueue 2050 */ 2051 static int nfsiod_start(void) 2052 { 2053 struct workqueue_struct *wq; 2054 dprintk("RPC: creating workqueue nfsiod\n"); 2055 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2056 if (wq == NULL) 2057 return -ENOMEM; 2058 nfsiod_workqueue = wq; 2059 return 0; 2060 } 2061 2062 /* 2063 * Destroy the nfsiod workqueue 2064 */ 2065 static void nfsiod_stop(void) 2066 { 2067 struct workqueue_struct *wq; 2068 2069 wq = nfsiod_workqueue; 2070 if (wq == NULL) 2071 return; 2072 nfsiod_workqueue = NULL; 2073 destroy_workqueue(wq); 2074 } 2075 2076 unsigned int nfs_net_id; 2077 EXPORT_SYMBOL_GPL(nfs_net_id); 2078 2079 static int nfs_net_init(struct net *net) 2080 { 2081 nfs_clients_init(net); 2082 return nfs_fs_proc_net_init(net); 2083 } 2084 2085 static void nfs_net_exit(struct net *net) 2086 { 2087 nfs_fs_proc_net_exit(net); 2088 nfs_cleanup_cb_ident_idr(net); 2089 } 2090 2091 static struct pernet_operations nfs_net_ops = { 2092 .init = nfs_net_init, 2093 .exit = nfs_net_exit, 2094 .id = &nfs_net_id, 2095 .size = sizeof(struct nfs_net), 2096 }; 2097 2098 /* 2099 * Initialize NFS 2100 */ 2101 static int __init init_nfs_fs(void) 2102 { 2103 int err; 2104 2105 err = register_pernet_subsys(&nfs_net_ops); 2106 if (err < 0) 2107 goto out9; 2108 2109 err = nfs_fscache_register(); 2110 if (err < 0) 2111 goto out8; 2112 2113 err = nfsiod_start(); 2114 if (err) 2115 goto out7; 2116 2117 err = nfs_fs_proc_init(); 2118 if (err) 2119 goto out6; 2120 2121 err = nfs_init_nfspagecache(); 2122 if (err) 2123 goto out5; 2124 2125 err = nfs_init_inodecache(); 2126 if (err) 2127 goto out4; 2128 2129 err = nfs_init_readpagecache(); 2130 if (err) 2131 goto out3; 2132 2133 err = nfs_init_writepagecache(); 2134 if (err) 2135 goto out2; 2136 2137 err = nfs_init_directcache(); 2138 if (err) 2139 goto out1; 2140 2141 rpc_proc_register(&init_net, &nfs_rpcstat); 2142 2143 err = register_nfs_fs(); 2144 if (err) 2145 goto out0; 2146 2147 return 0; 2148 out0: 2149 rpc_proc_unregister(&init_net, "nfs"); 2150 nfs_destroy_directcache(); 2151 out1: 2152 nfs_destroy_writepagecache(); 2153 out2: 2154 nfs_destroy_readpagecache(); 2155 out3: 2156 nfs_destroy_inodecache(); 2157 out4: 2158 nfs_destroy_nfspagecache(); 2159 out5: 2160 nfs_fs_proc_exit(); 2161 out6: 2162 nfsiod_stop(); 2163 out7: 2164 nfs_fscache_unregister(); 2165 out8: 2166 unregister_pernet_subsys(&nfs_net_ops); 2167 out9: 2168 return err; 2169 } 2170 2171 static void __exit exit_nfs_fs(void) 2172 { 2173 nfs_destroy_directcache(); 2174 nfs_destroy_writepagecache(); 2175 nfs_destroy_readpagecache(); 2176 nfs_destroy_inodecache(); 2177 nfs_destroy_nfspagecache(); 2178 nfs_fscache_unregister(); 2179 unregister_pernet_subsys(&nfs_net_ops); 2180 rpc_proc_unregister(&init_net, "nfs"); 2181 unregister_nfs_fs(); 2182 nfs_fs_proc_exit(); 2183 nfsiod_stop(); 2184 } 2185 2186 /* Not quite true; I just maintain it */ 2187 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2188 MODULE_LICENSE("GPL"); 2189 module_param(enable_ino64, bool, 0644); 2190 2191 module_init(init_nfs_fs) 2192 module_exit(exit_nfs_fs) 2193