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