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 */ 560 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 561 { 562 int err; 563 564 err = inode_newsize_ok(inode, offset); 565 if (err) 566 goto out; 567 568 spin_lock(&inode->i_lock); 569 i_size_write(inode, offset); 570 /* Optimisation */ 571 if (offset == 0) 572 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 573 spin_unlock(&inode->i_lock); 574 575 truncate_pagecache(inode, offset); 576 out: 577 return err; 578 } 579 580 /** 581 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 582 * @inode: pointer to struct inode 583 * @attr: pointer to struct iattr 584 * 585 * Note: we do this in the *proc.c in order to ensure that 586 * it works for things like exclusive creates too. 587 */ 588 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 589 { 590 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 591 spin_lock(&inode->i_lock); 592 if ((attr->ia_valid & ATTR_MODE) != 0) { 593 int mode = attr->ia_mode & S_IALLUGO; 594 mode |= inode->i_mode & ~S_IALLUGO; 595 inode->i_mode = mode; 596 } 597 if ((attr->ia_valid & ATTR_UID) != 0) 598 inode->i_uid = attr->ia_uid; 599 if ((attr->ia_valid & ATTR_GID) != 0) 600 inode->i_gid = attr->ia_gid; 601 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 602 | NFS_INO_INVALID_ACL); 603 spin_unlock(&inode->i_lock); 604 } 605 if ((attr->ia_valid & ATTR_SIZE) != 0) { 606 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 607 nfs_vmtruncate(inode, attr->ia_size); 608 } 609 } 610 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 611 612 static void nfs_request_parent_use_readdirplus(struct dentry *dentry) 613 { 614 struct dentry *parent; 615 616 parent = dget_parent(dentry); 617 nfs_force_use_readdirplus(parent->d_inode); 618 dput(parent); 619 } 620 621 static bool nfs_need_revalidate_inode(struct inode *inode) 622 { 623 if (NFS_I(inode)->cache_validity & 624 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 625 return true; 626 if (nfs_attribute_cache_expired(inode)) 627 return true; 628 return false; 629 } 630 631 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 632 { 633 struct inode *inode = dentry->d_inode; 634 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 635 int err = 0; 636 637 trace_nfs_getattr_enter(inode); 638 /* Flush out writes to the server in order to update c/mtime. */ 639 if (S_ISREG(inode->i_mode)) { 640 nfs_inode_dio_wait(inode); 641 err = filemap_write_and_wait(inode->i_mapping); 642 if (err) 643 goto out; 644 } 645 646 /* 647 * We may force a getattr if the user cares about atime. 648 * 649 * Note that we only have to check the vfsmount flags here: 650 * - NFS always sets S_NOATIME by so checking it would give a 651 * bogus result 652 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 653 * no point in checking those. 654 */ 655 if ((mnt->mnt_flags & MNT_NOATIME) || 656 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 657 need_atime = 0; 658 659 if (need_atime || nfs_need_revalidate_inode(inode)) { 660 struct nfs_server *server = NFS_SERVER(inode); 661 662 if (server->caps & NFS_CAP_READDIRPLUS) 663 nfs_request_parent_use_readdirplus(dentry); 664 err = __nfs_revalidate_inode(server, inode); 665 } 666 if (!err) { 667 generic_fillattr(inode, stat); 668 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 669 } 670 out: 671 trace_nfs_getattr_exit(inode, err); 672 return err; 673 } 674 EXPORT_SYMBOL_GPL(nfs_getattr); 675 676 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 677 { 678 atomic_set(&l_ctx->count, 1); 679 l_ctx->lockowner.l_owner = current->files; 680 l_ctx->lockowner.l_pid = current->tgid; 681 INIT_LIST_HEAD(&l_ctx->list); 682 nfs_iocounter_init(&l_ctx->io_count); 683 } 684 685 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 686 { 687 struct nfs_lock_context *head = &ctx->lock_context; 688 struct nfs_lock_context *pos = head; 689 690 do { 691 if (pos->lockowner.l_owner != current->files) 692 continue; 693 if (pos->lockowner.l_pid != current->tgid) 694 continue; 695 atomic_inc(&pos->count); 696 return pos; 697 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 698 return NULL; 699 } 700 701 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 702 { 703 struct nfs_lock_context *res, *new = NULL; 704 struct inode *inode = ctx->dentry->d_inode; 705 706 spin_lock(&inode->i_lock); 707 res = __nfs_find_lock_context(ctx); 708 if (res == NULL) { 709 spin_unlock(&inode->i_lock); 710 new = kmalloc(sizeof(*new), GFP_KERNEL); 711 if (new == NULL) 712 return ERR_PTR(-ENOMEM); 713 nfs_init_lock_context(new); 714 spin_lock(&inode->i_lock); 715 res = __nfs_find_lock_context(ctx); 716 if (res == NULL) { 717 list_add_tail(&new->list, &ctx->lock_context.list); 718 new->open_context = ctx; 719 res = new; 720 new = NULL; 721 } 722 } 723 spin_unlock(&inode->i_lock); 724 kfree(new); 725 return res; 726 } 727 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 728 729 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 730 { 731 struct nfs_open_context *ctx = l_ctx->open_context; 732 struct inode *inode = ctx->dentry->d_inode; 733 734 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 735 return; 736 list_del(&l_ctx->list); 737 spin_unlock(&inode->i_lock); 738 kfree(l_ctx); 739 } 740 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 741 742 /** 743 * nfs_close_context - Common close_context() routine NFSv2/v3 744 * @ctx: pointer to context 745 * @is_sync: is this a synchronous close 746 * 747 * always ensure that the attributes are up to date if we're mounted 748 * with close-to-open semantics 749 */ 750 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 751 { 752 struct inode *inode; 753 struct nfs_server *server; 754 755 if (!(ctx->mode & FMODE_WRITE)) 756 return; 757 if (!is_sync) 758 return; 759 inode = ctx->dentry->d_inode; 760 if (!list_empty(&NFS_I(inode)->open_files)) 761 return; 762 server = NFS_SERVER(inode); 763 if (server->flags & NFS_MOUNT_NOCTO) 764 return; 765 nfs_revalidate_inode(server, inode); 766 } 767 EXPORT_SYMBOL_GPL(nfs_close_context); 768 769 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 770 { 771 struct nfs_open_context *ctx; 772 struct rpc_cred *cred = rpc_lookup_cred(); 773 if (IS_ERR(cred)) 774 return ERR_CAST(cred); 775 776 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 777 if (!ctx) { 778 put_rpccred(cred); 779 return ERR_PTR(-ENOMEM); 780 } 781 nfs_sb_active(dentry->d_sb); 782 ctx->dentry = dget(dentry); 783 ctx->cred = cred; 784 ctx->state = NULL; 785 ctx->mode = f_mode; 786 ctx->flags = 0; 787 ctx->error = 0; 788 nfs_init_lock_context(&ctx->lock_context); 789 ctx->lock_context.open_context = ctx; 790 INIT_LIST_HEAD(&ctx->list); 791 ctx->mdsthreshold = NULL; 792 return ctx; 793 } 794 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 795 796 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 797 { 798 if (ctx != NULL) 799 atomic_inc(&ctx->lock_context.count); 800 return ctx; 801 } 802 EXPORT_SYMBOL_GPL(get_nfs_open_context); 803 804 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 805 { 806 struct inode *inode = ctx->dentry->d_inode; 807 struct super_block *sb = ctx->dentry->d_sb; 808 809 if (!list_empty(&ctx->list)) { 810 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 811 return; 812 list_del(&ctx->list); 813 spin_unlock(&inode->i_lock); 814 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 815 return; 816 if (inode != NULL) 817 NFS_PROTO(inode)->close_context(ctx, is_sync); 818 if (ctx->cred != NULL) 819 put_rpccred(ctx->cred); 820 dput(ctx->dentry); 821 nfs_sb_deactive(sb); 822 kfree(ctx->mdsthreshold); 823 kfree(ctx); 824 } 825 826 void put_nfs_open_context(struct nfs_open_context *ctx) 827 { 828 __put_nfs_open_context(ctx, 0); 829 } 830 EXPORT_SYMBOL_GPL(put_nfs_open_context); 831 832 /* 833 * Ensure that mmap has a recent RPC credential for use when writing out 834 * shared pages 835 */ 836 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 837 { 838 struct inode *inode = ctx->dentry->d_inode; 839 struct nfs_inode *nfsi = NFS_I(inode); 840 841 spin_lock(&inode->i_lock); 842 list_add(&ctx->list, &nfsi->open_files); 843 spin_unlock(&inode->i_lock); 844 } 845 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 846 847 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 848 { 849 filp->private_data = get_nfs_open_context(ctx); 850 if (list_empty(&ctx->list)) 851 nfs_inode_attach_open_context(ctx); 852 } 853 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 854 855 /* 856 * Given an inode, search for an open context with the desired characteristics 857 */ 858 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 859 { 860 struct nfs_inode *nfsi = NFS_I(inode); 861 struct nfs_open_context *pos, *ctx = NULL; 862 863 spin_lock(&inode->i_lock); 864 list_for_each_entry(pos, &nfsi->open_files, list) { 865 if (cred != NULL && pos->cred != cred) 866 continue; 867 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 868 continue; 869 ctx = get_nfs_open_context(pos); 870 break; 871 } 872 spin_unlock(&inode->i_lock); 873 return ctx; 874 } 875 876 static void nfs_file_clear_open_context(struct file *filp) 877 { 878 struct nfs_open_context *ctx = nfs_file_open_context(filp); 879 880 if (ctx) { 881 struct inode *inode = ctx->dentry->d_inode; 882 883 filp->private_data = NULL; 884 spin_lock(&inode->i_lock); 885 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 886 spin_unlock(&inode->i_lock); 887 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 888 } 889 } 890 891 /* 892 * These allocate and release file read/write context information. 893 */ 894 int nfs_open(struct inode *inode, struct file *filp) 895 { 896 struct nfs_open_context *ctx; 897 898 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 899 if (IS_ERR(ctx)) 900 return PTR_ERR(ctx); 901 nfs_file_set_open_context(filp, ctx); 902 put_nfs_open_context(ctx); 903 nfs_fscache_open_file(inode, filp); 904 return 0; 905 } 906 907 int nfs_release(struct inode *inode, struct file *filp) 908 { 909 nfs_file_clear_open_context(filp); 910 return 0; 911 } 912 913 /* 914 * This function is called whenever some part of NFS notices that 915 * the cached attributes have to be refreshed. 916 */ 917 int 918 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 919 { 920 int status = -ESTALE; 921 struct nfs4_label *label = NULL; 922 struct nfs_fattr *fattr = NULL; 923 struct nfs_inode *nfsi = NFS_I(inode); 924 925 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 926 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 927 928 trace_nfs_revalidate_inode_enter(inode); 929 930 if (is_bad_inode(inode)) 931 goto out; 932 if (NFS_STALE(inode)) 933 goto out; 934 935 status = -ENOMEM; 936 fattr = nfs_alloc_fattr(); 937 if (fattr == NULL) 938 goto out; 939 940 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 941 942 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 943 if (IS_ERR(label)) { 944 status = PTR_ERR(label); 945 goto out; 946 } 947 948 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 949 if (status != 0) { 950 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 951 inode->i_sb->s_id, 952 (unsigned long long)NFS_FILEID(inode), status); 953 if (status == -ESTALE) { 954 nfs_zap_caches(inode); 955 if (!S_ISDIR(inode->i_mode)) 956 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 957 } 958 goto err_out; 959 } 960 961 status = nfs_refresh_inode(inode, fattr); 962 if (status) { 963 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 964 inode->i_sb->s_id, 965 (unsigned long long)NFS_FILEID(inode), status); 966 goto err_out; 967 } 968 969 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 970 nfs_zap_acl_cache(inode); 971 972 nfs_setsecurity(inode, fattr, label); 973 974 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 975 inode->i_sb->s_id, 976 (unsigned long long)NFS_FILEID(inode)); 977 978 err_out: 979 nfs4_label_free(label); 980 out: 981 nfs_free_fattr(fattr); 982 trace_nfs_revalidate_inode_exit(inode, status); 983 return status; 984 } 985 986 int nfs_attribute_timeout(struct inode *inode) 987 { 988 struct nfs_inode *nfsi = NFS_I(inode); 989 990 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 991 } 992 993 int nfs_attribute_cache_expired(struct inode *inode) 994 { 995 if (nfs_have_delegated_attributes(inode)) 996 return 0; 997 return nfs_attribute_timeout(inode); 998 } 999 1000 /** 1001 * nfs_revalidate_inode - Revalidate the inode attributes 1002 * @server - pointer to nfs_server struct 1003 * @inode - pointer to inode struct 1004 * 1005 * Updates inode attribute information by retrieving the data from the server. 1006 */ 1007 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1008 { 1009 if (!nfs_need_revalidate_inode(inode)) 1010 return NFS_STALE(inode) ? -ESTALE : 0; 1011 return __nfs_revalidate_inode(server, inode); 1012 } 1013 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1014 1015 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode) 1016 { 1017 if (!(NFS_I(inode)->cache_validity & 1018 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 1019 && !nfs_attribute_cache_expired(inode)) 1020 return NFS_STALE(inode) ? -ESTALE : 0; 1021 return -ECHILD; 1022 } 1023 1024 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1025 { 1026 struct nfs_inode *nfsi = NFS_I(inode); 1027 int ret; 1028 1029 if (mapping->nrpages != 0) { 1030 if (S_ISREG(inode->i_mode)) { 1031 ret = nfs_sync_mapping(mapping); 1032 if (ret < 0) 1033 return ret; 1034 } 1035 ret = invalidate_inode_pages2(mapping); 1036 if (ret < 0) 1037 return ret; 1038 } 1039 if (S_ISDIR(inode->i_mode)) { 1040 spin_lock(&inode->i_lock); 1041 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1042 spin_unlock(&inode->i_lock); 1043 } 1044 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1045 nfs_fscache_wait_on_invalidate(inode); 1046 1047 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1048 inode->i_sb->s_id, 1049 (unsigned long long)NFS_FILEID(inode)); 1050 return 0; 1051 } 1052 1053 static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1054 { 1055 if (nfs_have_delegated_attributes(inode)) 1056 return false; 1057 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 1058 || nfs_attribute_timeout(inode) 1059 || NFS_STALE(inode); 1060 } 1061 1062 /** 1063 * nfs_revalidate_mapping - Revalidate the pagecache 1064 * @inode - pointer to host inode 1065 * @mapping - pointer to mapping 1066 */ 1067 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1068 { 1069 struct nfs_inode *nfsi = NFS_I(inode); 1070 unsigned long *bitlock = &nfsi->flags; 1071 int ret = 0; 1072 1073 /* swapfiles are not supposed to be shared. */ 1074 if (IS_SWAPFILE(inode)) 1075 goto out; 1076 1077 if (nfs_mapping_need_revalidate_inode(inode)) { 1078 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1079 if (ret < 0) 1080 goto out; 1081 } 1082 1083 /* 1084 * We must clear NFS_INO_INVALID_DATA first to ensure that 1085 * invalidations that come in while we're shooting down the mappings 1086 * are respected. But, that leaves a race window where one revalidator 1087 * can clear the flag, and then another checks it before the mapping 1088 * gets invalidated. Fix that by serializing access to this part of 1089 * the function. 1090 * 1091 * At the same time, we need to allow other tasks to see whether we 1092 * might be in the middle of invalidating the pages, so we only set 1093 * the bit lock here if it looks like we're going to be doing that. 1094 */ 1095 for (;;) { 1096 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1097 nfs_wait_bit_killable, TASK_KILLABLE); 1098 if (ret) 1099 goto out; 1100 spin_lock(&inode->i_lock); 1101 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1102 spin_unlock(&inode->i_lock); 1103 continue; 1104 } 1105 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1106 break; 1107 spin_unlock(&inode->i_lock); 1108 goto out; 1109 } 1110 1111 set_bit(NFS_INO_INVALIDATING, bitlock); 1112 smp_wmb(); 1113 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1114 spin_unlock(&inode->i_lock); 1115 trace_nfs_invalidate_mapping_enter(inode); 1116 ret = nfs_invalidate_mapping(inode, mapping); 1117 trace_nfs_invalidate_mapping_exit(inode, ret); 1118 1119 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1120 smp_mb__after_atomic(); 1121 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1122 out: 1123 return ret; 1124 } 1125 1126 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1127 { 1128 struct nfs_inode *nfsi = NFS_I(inode); 1129 unsigned long ret = 0; 1130 1131 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1132 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1133 && inode->i_version == fattr->pre_change_attr) { 1134 inode->i_version = fattr->change_attr; 1135 if (S_ISDIR(inode->i_mode)) 1136 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1137 ret |= NFS_INO_INVALID_ATTR; 1138 } 1139 /* If we have atomic WCC data, we may update some attributes */ 1140 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1141 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1142 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1143 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1144 ret |= NFS_INO_INVALID_ATTR; 1145 } 1146 1147 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1148 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1149 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1150 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1151 if (S_ISDIR(inode->i_mode)) 1152 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1153 ret |= NFS_INO_INVALID_ATTR; 1154 } 1155 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1156 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1157 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1158 && nfsi->nrequests == 0) { 1159 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1160 ret |= NFS_INO_INVALID_ATTR; 1161 } 1162 1163 return ret; 1164 } 1165 1166 /** 1167 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1168 * @inode - pointer to inode 1169 * @fattr - updated attributes 1170 * 1171 * Verifies the attribute cache. If we have just changed the attributes, 1172 * so that fattr carries weak cache consistency data, then it may 1173 * also update the ctime/mtime/change_attribute. 1174 */ 1175 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1176 { 1177 struct nfs_inode *nfsi = NFS_I(inode); 1178 loff_t cur_size, new_isize; 1179 unsigned long invalid = 0; 1180 1181 1182 if (nfs_have_delegated_attributes(inode)) 1183 return 0; 1184 /* Has the inode gone and changed behind our back? */ 1185 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1186 return -EIO; 1187 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1188 return -EIO; 1189 1190 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1191 inode->i_version != fattr->change_attr) 1192 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1193 1194 /* Verify a few of the more important attributes */ 1195 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1196 invalid |= NFS_INO_INVALID_ATTR; 1197 1198 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1199 cur_size = i_size_read(inode); 1200 new_isize = nfs_size_to_loff_t(fattr->size); 1201 if (cur_size != new_isize && nfsi->nrequests == 0) 1202 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1203 } 1204 1205 /* Have any file permissions changed? */ 1206 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1207 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1208 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1209 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1210 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1211 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1212 1213 /* Has the link count changed? */ 1214 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1215 invalid |= NFS_INO_INVALID_ATTR; 1216 1217 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1218 invalid |= NFS_INO_INVALID_ATIME; 1219 1220 if (invalid != 0) 1221 nfs_set_cache_invalid(inode, invalid); 1222 1223 nfsi->read_cache_jiffies = fattr->time_start; 1224 return 0; 1225 } 1226 1227 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1228 { 1229 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 1230 return 0; 1231 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 1232 } 1233 1234 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1235 { 1236 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 1237 return 0; 1238 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 1239 } 1240 1241 static atomic_long_t nfs_attr_generation_counter; 1242 1243 static unsigned long nfs_read_attr_generation_counter(void) 1244 { 1245 return atomic_long_read(&nfs_attr_generation_counter); 1246 } 1247 1248 unsigned long nfs_inc_attr_generation_counter(void) 1249 { 1250 return atomic_long_inc_return(&nfs_attr_generation_counter); 1251 } 1252 1253 void nfs_fattr_init(struct nfs_fattr *fattr) 1254 { 1255 fattr->valid = 0; 1256 fattr->time_start = jiffies; 1257 fattr->gencount = nfs_inc_attr_generation_counter(); 1258 fattr->owner_name = NULL; 1259 fattr->group_name = NULL; 1260 } 1261 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1262 1263 struct nfs_fattr *nfs_alloc_fattr(void) 1264 { 1265 struct nfs_fattr *fattr; 1266 1267 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1268 if (fattr != NULL) 1269 nfs_fattr_init(fattr); 1270 return fattr; 1271 } 1272 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1273 1274 struct nfs_fh *nfs_alloc_fhandle(void) 1275 { 1276 struct nfs_fh *fh; 1277 1278 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1279 if (fh != NULL) 1280 fh->size = 0; 1281 return fh; 1282 } 1283 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1284 1285 #ifdef NFS_DEBUG 1286 /* 1287 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1288 * in the same way that wireshark does 1289 * 1290 * @fh: file handle 1291 * 1292 * For debugging only. 1293 */ 1294 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1295 { 1296 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1297 * not on the result */ 1298 return nfs_fhandle_hash(fh); 1299 } 1300 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1301 1302 /* 1303 * _nfs_display_fhandle - display an NFS file handle on the console 1304 * 1305 * @fh: file handle to display 1306 * @caption: display caption 1307 * 1308 * For debugging only. 1309 */ 1310 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1311 { 1312 unsigned short i; 1313 1314 if (fh == NULL || fh->size == 0) { 1315 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1316 return; 1317 } 1318 1319 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1320 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1321 for (i = 0; i < fh->size; i += 16) { 1322 __be32 *pos = (__be32 *)&fh->data[i]; 1323 1324 switch ((fh->size - i - 1) >> 2) { 1325 case 0: 1326 printk(KERN_DEFAULT " %08x\n", 1327 be32_to_cpup(pos)); 1328 break; 1329 case 1: 1330 printk(KERN_DEFAULT " %08x %08x\n", 1331 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1332 break; 1333 case 2: 1334 printk(KERN_DEFAULT " %08x %08x %08x\n", 1335 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1336 be32_to_cpup(pos + 2)); 1337 break; 1338 default: 1339 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1340 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1341 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1342 } 1343 } 1344 } 1345 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1346 #endif 1347 1348 /** 1349 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1350 * @inode - pointer to inode 1351 * @fattr - attributes 1352 * 1353 * Attempt to divine whether or not an RPC call reply carrying stale 1354 * attributes got scheduled after another call carrying updated ones. 1355 * 1356 * To do so, the function first assumes that a more recent ctime means 1357 * that the attributes in fattr are newer, however it also attempt to 1358 * catch the case where ctime either didn't change, or went backwards 1359 * (if someone reset the clock on the server) by looking at whether 1360 * or not this RPC call was started after the inode was last updated. 1361 * Note also the check for wraparound of 'attr_gencount' 1362 * 1363 * The function returns 'true' if it thinks the attributes in 'fattr' are 1364 * more recent than the ones cached in the inode. 1365 * 1366 */ 1367 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1368 { 1369 const struct nfs_inode *nfsi = NFS_I(inode); 1370 1371 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1372 nfs_ctime_need_update(inode, fattr) || 1373 nfs_size_need_update(inode, fattr) || 1374 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1375 } 1376 1377 /* 1378 * Don't trust the change_attribute, mtime, ctime or size if 1379 * a pnfs LAYOUTCOMMIT is outstanding 1380 */ 1381 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode, 1382 struct nfs_fattr *fattr) 1383 { 1384 if (pnfs_layoutcommit_outstanding(inode)) 1385 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE | 1386 NFS_ATTR_FATTR_MTIME | 1387 NFS_ATTR_FATTR_CTIME | 1388 NFS_ATTR_FATTR_SIZE); 1389 } 1390 1391 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1392 { 1393 int ret; 1394 1395 trace_nfs_refresh_inode_enter(inode); 1396 1397 nfs_inode_attrs_handle_layoutcommit(inode, fattr); 1398 1399 if (nfs_inode_attrs_need_update(inode, fattr)) 1400 ret = nfs_update_inode(inode, fattr); 1401 else 1402 ret = nfs_check_inode_attributes(inode, fattr); 1403 1404 trace_nfs_refresh_inode_exit(inode, ret); 1405 return ret; 1406 } 1407 1408 /** 1409 * nfs_refresh_inode - try to update the inode attribute cache 1410 * @inode - pointer to inode 1411 * @fattr - updated attributes 1412 * 1413 * Check that an RPC call that returned attributes has not overlapped with 1414 * other recent updates of the inode metadata, then decide whether it is 1415 * safe to do a full update of the inode attributes, or whether just to 1416 * call nfs_check_inode_attributes. 1417 */ 1418 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1419 { 1420 int status; 1421 1422 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1423 return 0; 1424 spin_lock(&inode->i_lock); 1425 status = nfs_refresh_inode_locked(inode, fattr); 1426 spin_unlock(&inode->i_lock); 1427 1428 return status; 1429 } 1430 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1431 1432 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1433 { 1434 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1435 1436 if (S_ISDIR(inode->i_mode)) 1437 invalid |= NFS_INO_INVALID_DATA; 1438 nfs_set_cache_invalid(inode, invalid); 1439 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1440 return 0; 1441 return nfs_refresh_inode_locked(inode, fattr); 1442 } 1443 1444 /** 1445 * nfs_post_op_update_inode - try to update the inode attribute cache 1446 * @inode - pointer to inode 1447 * @fattr - updated attributes 1448 * 1449 * After an operation that has changed the inode metadata, mark the 1450 * attribute cache as being invalid, then try to update it. 1451 * 1452 * NB: if the server didn't return any post op attributes, this 1453 * function will force the retrieval of attributes before the next 1454 * NFS request. Thus it should be used only for operations that 1455 * are expected to change one or more attributes, to avoid 1456 * unnecessary NFS requests and trips through nfs_update_inode(). 1457 */ 1458 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1459 { 1460 int status; 1461 1462 spin_lock(&inode->i_lock); 1463 status = nfs_post_op_update_inode_locked(inode, fattr); 1464 spin_unlock(&inode->i_lock); 1465 1466 return status; 1467 } 1468 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1469 1470 /** 1471 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1472 * @inode - pointer to inode 1473 * @fattr - updated attributes 1474 * 1475 * After an operation that has changed the inode metadata, mark the 1476 * attribute cache as being invalid, then try to update it. Fake up 1477 * weak cache consistency data, if none exist. 1478 * 1479 * This function is mainly designed to be used by the ->write_done() functions. 1480 */ 1481 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1482 { 1483 int status; 1484 1485 spin_lock(&inode->i_lock); 1486 /* Don't do a WCC update if these attributes are already stale */ 1487 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1488 !nfs_inode_attrs_need_update(inode, fattr)) { 1489 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1490 | NFS_ATTR_FATTR_PRESIZE 1491 | NFS_ATTR_FATTR_PREMTIME 1492 | NFS_ATTR_FATTR_PRECTIME); 1493 goto out_noforce; 1494 } 1495 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1496 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1497 fattr->pre_change_attr = inode->i_version; 1498 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1499 } 1500 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1501 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1502 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1503 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1504 } 1505 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1506 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1507 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1508 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1509 } 1510 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1511 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1512 fattr->pre_size = i_size_read(inode); 1513 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1514 } 1515 out_noforce: 1516 status = nfs_post_op_update_inode_locked(inode, fattr); 1517 spin_unlock(&inode->i_lock); 1518 return status; 1519 } 1520 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1521 1522 /* 1523 * Many nfs protocol calls return the new file attributes after 1524 * an operation. Here we update the inode to reflect the state 1525 * of the server's inode. 1526 * 1527 * This is a bit tricky because we have to make sure all dirty pages 1528 * have been sent off to the server before calling invalidate_inode_pages. 1529 * To make sure no other process adds more write requests while we try 1530 * our best to flush them, we make them sleep during the attribute refresh. 1531 * 1532 * A very similar scenario holds for the dir cache. 1533 */ 1534 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1535 { 1536 struct nfs_server *server; 1537 struct nfs_inode *nfsi = NFS_I(inode); 1538 loff_t cur_isize, new_isize; 1539 unsigned long invalid = 0; 1540 unsigned long now = jiffies; 1541 unsigned long save_cache_validity; 1542 1543 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1544 __func__, inode->i_sb->s_id, inode->i_ino, 1545 nfs_display_fhandle_hash(NFS_FH(inode)), 1546 atomic_read(&inode->i_count), fattr->valid); 1547 1548 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) { 1549 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1550 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1551 NFS_SERVER(inode)->nfs_client->cl_hostname, 1552 inode->i_sb->s_id, (long long)nfsi->fileid, 1553 (long long)fattr->fileid); 1554 goto out_err; 1555 } 1556 1557 /* 1558 * Make sure the inode's type hasn't changed. 1559 */ 1560 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1561 /* 1562 * Big trouble! The inode has become a different object. 1563 */ 1564 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1565 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1566 goto out_err; 1567 } 1568 1569 server = NFS_SERVER(inode); 1570 /* Update the fsid? */ 1571 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1572 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1573 !IS_AUTOMOUNT(inode)) 1574 server->fsid = fattr->fsid; 1575 1576 /* 1577 * Update the read time so we don't revalidate too often. 1578 */ 1579 nfsi->read_cache_jiffies = fattr->time_start; 1580 1581 save_cache_validity = nfsi->cache_validity; 1582 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1583 | NFS_INO_INVALID_ATIME 1584 | NFS_INO_REVAL_FORCED 1585 | NFS_INO_REVAL_PAGECACHE); 1586 1587 /* Do atomic weak cache consistency updates */ 1588 invalid |= nfs_wcc_update_inode(inode, fattr); 1589 1590 /* More cache consistency checks */ 1591 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1592 if (inode->i_version != fattr->change_attr) { 1593 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1594 inode->i_sb->s_id, inode->i_ino); 1595 invalid |= NFS_INO_INVALID_ATTR 1596 | NFS_INO_INVALID_DATA 1597 | NFS_INO_INVALID_ACCESS 1598 | NFS_INO_INVALID_ACL 1599 | NFS_INO_REVAL_PAGECACHE; 1600 if (S_ISDIR(inode->i_mode)) 1601 nfs_force_lookup_revalidate(inode); 1602 inode->i_version = fattr->change_attr; 1603 } 1604 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1605 nfsi->cache_validity |= save_cache_validity; 1606 1607 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1608 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1609 } else if (server->caps & NFS_CAP_MTIME) 1610 nfsi->cache_validity |= save_cache_validity & 1611 (NFS_INO_INVALID_ATTR 1612 | NFS_INO_REVAL_FORCED); 1613 1614 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1615 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1616 } else if (server->caps & NFS_CAP_CTIME) 1617 nfsi->cache_validity |= save_cache_validity & 1618 (NFS_INO_INVALID_ATTR 1619 | NFS_INO_REVAL_FORCED); 1620 1621 /* Check if our cached file size is stale */ 1622 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1623 new_isize = nfs_size_to_loff_t(fattr->size); 1624 cur_isize = i_size_read(inode); 1625 if (new_isize != cur_isize) { 1626 /* Do we perhaps have any outstanding writes, or has 1627 * the file grown beyond our last write? */ 1628 if ((nfsi->nrequests == 0) || new_isize > cur_isize) { 1629 i_size_write(inode, new_isize); 1630 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1631 invalid &= ~NFS_INO_REVAL_PAGECACHE; 1632 } 1633 dprintk("NFS: isize change on server for file %s/%ld " 1634 "(%Ld to %Ld)\n", 1635 inode->i_sb->s_id, 1636 inode->i_ino, 1637 (long long)cur_isize, 1638 (long long)new_isize); 1639 } 1640 } else 1641 nfsi->cache_validity |= save_cache_validity & 1642 (NFS_INO_INVALID_ATTR 1643 | NFS_INO_REVAL_PAGECACHE 1644 | NFS_INO_REVAL_FORCED); 1645 1646 1647 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1648 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1649 else if (server->caps & NFS_CAP_ATIME) 1650 nfsi->cache_validity |= save_cache_validity & 1651 (NFS_INO_INVALID_ATIME 1652 | NFS_INO_REVAL_FORCED); 1653 1654 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1655 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1656 umode_t newmode = inode->i_mode & S_IFMT; 1657 newmode |= fattr->mode & S_IALLUGO; 1658 inode->i_mode = newmode; 1659 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1660 } 1661 } else if (server->caps & NFS_CAP_MODE) 1662 nfsi->cache_validity |= save_cache_validity & 1663 (NFS_INO_INVALID_ATTR 1664 | NFS_INO_INVALID_ACCESS 1665 | NFS_INO_INVALID_ACL 1666 | NFS_INO_REVAL_FORCED); 1667 1668 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1669 if (!uid_eq(inode->i_uid, fattr->uid)) { 1670 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1671 inode->i_uid = fattr->uid; 1672 } 1673 } else if (server->caps & NFS_CAP_OWNER) 1674 nfsi->cache_validity |= save_cache_validity & 1675 (NFS_INO_INVALID_ATTR 1676 | NFS_INO_INVALID_ACCESS 1677 | NFS_INO_INVALID_ACL 1678 | NFS_INO_REVAL_FORCED); 1679 1680 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1681 if (!gid_eq(inode->i_gid, fattr->gid)) { 1682 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1683 inode->i_gid = fattr->gid; 1684 } 1685 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1686 nfsi->cache_validity |= save_cache_validity & 1687 (NFS_INO_INVALID_ATTR 1688 | NFS_INO_INVALID_ACCESS 1689 | NFS_INO_INVALID_ACL 1690 | NFS_INO_REVAL_FORCED); 1691 1692 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1693 if (inode->i_nlink != fattr->nlink) { 1694 invalid |= NFS_INO_INVALID_ATTR; 1695 if (S_ISDIR(inode->i_mode)) 1696 invalid |= NFS_INO_INVALID_DATA; 1697 set_nlink(inode, fattr->nlink); 1698 } 1699 } else if (server->caps & NFS_CAP_NLINK) 1700 nfsi->cache_validity |= save_cache_validity & 1701 (NFS_INO_INVALID_ATTR 1702 | NFS_INO_REVAL_FORCED); 1703 1704 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1705 /* 1706 * report the blocks in 512byte units 1707 */ 1708 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1709 } 1710 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1711 inode->i_blocks = fattr->du.nfs2.blocks; 1712 1713 /* Update attrtimeo value if we're out of the unstable period */ 1714 if (invalid & NFS_INO_INVALID_ATTR) { 1715 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1716 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1717 nfsi->attrtimeo_timestamp = now; 1718 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1719 } else { 1720 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1721 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1722 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1723 nfsi->attrtimeo_timestamp = now; 1724 } 1725 } 1726 invalid &= ~NFS_INO_INVALID_ATTR; 1727 /* Don't invalidate the data if we were to blame */ 1728 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1729 || S_ISLNK(inode->i_mode))) 1730 invalid &= ~NFS_INO_INVALID_DATA; 1731 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1732 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1733 nfs_set_cache_invalid(inode, invalid); 1734 1735 return 0; 1736 out_err: 1737 /* 1738 * No need to worry about unhashing the dentry, as the 1739 * lookup validation will know that the inode is bad. 1740 * (But we fall through to invalidate the caches.) 1741 */ 1742 nfs_invalidate_inode(inode); 1743 return -ESTALE; 1744 } 1745 1746 struct inode *nfs_alloc_inode(struct super_block *sb) 1747 { 1748 struct nfs_inode *nfsi; 1749 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1750 if (!nfsi) 1751 return NULL; 1752 nfsi->flags = 0UL; 1753 nfsi->cache_validity = 0UL; 1754 #if IS_ENABLED(CONFIG_NFS_V4) 1755 nfsi->nfs4_acl = NULL; 1756 #endif /* CONFIG_NFS_V4 */ 1757 return &nfsi->vfs_inode; 1758 } 1759 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1760 1761 static void nfs_i_callback(struct rcu_head *head) 1762 { 1763 struct inode *inode = container_of(head, struct inode, i_rcu); 1764 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1765 } 1766 1767 void nfs_destroy_inode(struct inode *inode) 1768 { 1769 call_rcu(&inode->i_rcu, nfs_i_callback); 1770 } 1771 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1772 1773 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1774 { 1775 #if IS_ENABLED(CONFIG_NFS_V4) 1776 INIT_LIST_HEAD(&nfsi->open_states); 1777 nfsi->delegation = NULL; 1778 init_rwsem(&nfsi->rwsem); 1779 nfsi->layout = NULL; 1780 #endif 1781 } 1782 1783 static void init_once(void *foo) 1784 { 1785 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1786 1787 inode_init_once(&nfsi->vfs_inode); 1788 INIT_LIST_HEAD(&nfsi->open_files); 1789 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1790 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1791 INIT_LIST_HEAD(&nfsi->commit_info.list); 1792 nfsi->nrequests = 0; 1793 nfsi->commit_info.ncommit = 0; 1794 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1795 atomic_set(&nfsi->silly_count, 1); 1796 INIT_HLIST_HEAD(&nfsi->silly_list); 1797 init_waitqueue_head(&nfsi->waitqueue); 1798 nfs4_init_once(nfsi); 1799 } 1800 1801 static int __init nfs_init_inodecache(void) 1802 { 1803 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1804 sizeof(struct nfs_inode), 1805 0, (SLAB_RECLAIM_ACCOUNT| 1806 SLAB_MEM_SPREAD), 1807 init_once); 1808 if (nfs_inode_cachep == NULL) 1809 return -ENOMEM; 1810 1811 return 0; 1812 } 1813 1814 static void nfs_destroy_inodecache(void) 1815 { 1816 /* 1817 * Make sure all delayed rcu free inodes are flushed before we 1818 * destroy cache. 1819 */ 1820 rcu_barrier(); 1821 kmem_cache_destroy(nfs_inode_cachep); 1822 } 1823 1824 struct workqueue_struct *nfsiod_workqueue; 1825 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1826 1827 /* 1828 * start up the nfsiod workqueue 1829 */ 1830 static int nfsiod_start(void) 1831 { 1832 struct workqueue_struct *wq; 1833 dprintk("RPC: creating workqueue nfsiod\n"); 1834 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1835 if (wq == NULL) 1836 return -ENOMEM; 1837 nfsiod_workqueue = wq; 1838 return 0; 1839 } 1840 1841 /* 1842 * Destroy the nfsiod workqueue 1843 */ 1844 static void nfsiod_stop(void) 1845 { 1846 struct workqueue_struct *wq; 1847 1848 wq = nfsiod_workqueue; 1849 if (wq == NULL) 1850 return; 1851 nfsiod_workqueue = NULL; 1852 destroy_workqueue(wq); 1853 } 1854 1855 int nfs_net_id; 1856 EXPORT_SYMBOL_GPL(nfs_net_id); 1857 1858 static int nfs_net_init(struct net *net) 1859 { 1860 nfs_clients_init(net); 1861 return nfs_fs_proc_net_init(net); 1862 } 1863 1864 static void nfs_net_exit(struct net *net) 1865 { 1866 nfs_fs_proc_net_exit(net); 1867 nfs_cleanup_cb_ident_idr(net); 1868 } 1869 1870 static struct pernet_operations nfs_net_ops = { 1871 .init = nfs_net_init, 1872 .exit = nfs_net_exit, 1873 .id = &nfs_net_id, 1874 .size = sizeof(struct nfs_net), 1875 }; 1876 1877 /* 1878 * Initialize NFS 1879 */ 1880 static int __init init_nfs_fs(void) 1881 { 1882 int err; 1883 1884 err = register_pernet_subsys(&nfs_net_ops); 1885 if (err < 0) 1886 goto out9; 1887 1888 err = nfs_fscache_register(); 1889 if (err < 0) 1890 goto out8; 1891 1892 err = nfsiod_start(); 1893 if (err) 1894 goto out7; 1895 1896 err = nfs_fs_proc_init(); 1897 if (err) 1898 goto out6; 1899 1900 err = nfs_init_nfspagecache(); 1901 if (err) 1902 goto out5; 1903 1904 err = nfs_init_inodecache(); 1905 if (err) 1906 goto out4; 1907 1908 err = nfs_init_readpagecache(); 1909 if (err) 1910 goto out3; 1911 1912 err = nfs_init_writepagecache(); 1913 if (err) 1914 goto out2; 1915 1916 err = nfs_init_directcache(); 1917 if (err) 1918 goto out1; 1919 1920 #ifdef CONFIG_PROC_FS 1921 rpc_proc_register(&init_net, &nfs_rpcstat); 1922 #endif 1923 if ((err = register_nfs_fs()) != 0) 1924 goto out0; 1925 1926 return 0; 1927 out0: 1928 #ifdef CONFIG_PROC_FS 1929 rpc_proc_unregister(&init_net, "nfs"); 1930 #endif 1931 nfs_destroy_directcache(); 1932 out1: 1933 nfs_destroy_writepagecache(); 1934 out2: 1935 nfs_destroy_readpagecache(); 1936 out3: 1937 nfs_destroy_inodecache(); 1938 out4: 1939 nfs_destroy_nfspagecache(); 1940 out5: 1941 nfs_fs_proc_exit(); 1942 out6: 1943 nfsiod_stop(); 1944 out7: 1945 nfs_fscache_unregister(); 1946 out8: 1947 unregister_pernet_subsys(&nfs_net_ops); 1948 out9: 1949 return err; 1950 } 1951 1952 static void __exit exit_nfs_fs(void) 1953 { 1954 nfs_destroy_directcache(); 1955 nfs_destroy_writepagecache(); 1956 nfs_destroy_readpagecache(); 1957 nfs_destroy_inodecache(); 1958 nfs_destroy_nfspagecache(); 1959 nfs_fscache_unregister(); 1960 unregister_pernet_subsys(&nfs_net_ops); 1961 #ifdef CONFIG_PROC_FS 1962 rpc_proc_unregister(&init_net, "nfs"); 1963 #endif 1964 unregister_nfs_fs(); 1965 nfs_fs_proc_exit(); 1966 nfsiod_stop(); 1967 } 1968 1969 /* Not quite true; I just maintain it */ 1970 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1971 MODULE_LICENSE("GPL"); 1972 module_param(enable_ino64, bool, 0644); 1973 1974 module_init(init_nfs_fs) 1975 module_exit(exit_nfs_fs) 1976