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