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