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 static int nfs_wait_killable(int mode) 75 { 76 freezable_schedule_unsafe(); 77 if (signal_pending_state(mode, current)) 78 return -ERESTARTSYS; 79 return 0; 80 } 81 82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) 83 { 84 return nfs_wait_killable(mode); 85 } 86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 87 88 int nfs_wait_atomic_killable(atomic_t *p) 89 { 90 return nfs_wait_killable(TASK_KILLABLE); 91 } 92 93 /** 94 * nfs_compat_user_ino64 - returns the user-visible inode number 95 * @fileid: 64-bit fileid 96 * 97 * This function returns a 32-bit inode number if the boot parameter 98 * nfs.enable_ino64 is zero. 99 */ 100 u64 nfs_compat_user_ino64(u64 fileid) 101 { 102 #ifdef CONFIG_COMPAT 103 compat_ulong_t ino; 104 #else 105 unsigned long ino; 106 #endif 107 108 if (enable_ino64) 109 return fileid; 110 ino = fileid; 111 if (sizeof(ino) < sizeof(fileid)) 112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 113 return ino; 114 } 115 116 int nfs_drop_inode(struct inode *inode) 117 { 118 return NFS_STALE(inode) || generic_drop_inode(inode); 119 } 120 EXPORT_SYMBOL_GPL(nfs_drop_inode); 121 122 void nfs_clear_inode(struct inode *inode) 123 { 124 /* 125 * The following should never happen... 126 */ 127 WARN_ON_ONCE(nfs_have_writebacks(inode)); 128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 129 nfs_zap_acl_cache(inode); 130 nfs_access_zap_cache(inode); 131 nfs_fscache_clear_inode(inode); 132 } 133 EXPORT_SYMBOL_GPL(nfs_clear_inode); 134 135 void nfs_evict_inode(struct inode *inode) 136 { 137 truncate_inode_pages_final(&inode->i_data); 138 clear_inode(inode); 139 nfs_clear_inode(inode); 140 } 141 142 int nfs_sync_inode(struct inode *inode) 143 { 144 inode_dio_wait(inode); 145 return nfs_wb_all(inode); 146 } 147 EXPORT_SYMBOL_GPL(nfs_sync_inode); 148 149 /** 150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 151 */ 152 int nfs_sync_mapping(struct address_space *mapping) 153 { 154 int ret = 0; 155 156 if (mapping->nrpages != 0) { 157 unmap_mapping_range(mapping, 0, 0, 0); 158 ret = nfs_wb_all(mapping->host); 159 } 160 return ret; 161 } 162 163 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 164 { 165 struct nfs_inode *nfsi = NFS_I(inode); 166 167 if (inode->i_mapping->nrpages == 0) 168 flags &= ~NFS_INO_INVALID_DATA; 169 nfsi->cache_validity |= flags; 170 if (flags & NFS_INO_INVALID_DATA) 171 nfs_fscache_invalidate(inode); 172 } 173 174 /* 175 * Invalidate the local caches 176 */ 177 static void nfs_zap_caches_locked(struct inode *inode) 178 { 179 struct nfs_inode *nfsi = NFS_I(inode); 180 int mode = inode->i_mode; 181 182 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 183 184 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 185 nfsi->attrtimeo_timestamp = jiffies; 186 187 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); 188 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 190 | NFS_INO_INVALID_DATA 191 | NFS_INO_INVALID_ACCESS 192 | NFS_INO_INVALID_ACL 193 | NFS_INO_REVAL_PAGECACHE); 194 } else 195 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 196 | NFS_INO_INVALID_ACCESS 197 | NFS_INO_INVALID_ACL 198 | NFS_INO_REVAL_PAGECACHE); 199 nfs_zap_label_cache_locked(nfsi); 200 } 201 202 void nfs_zap_caches(struct inode *inode) 203 { 204 spin_lock(&inode->i_lock); 205 nfs_zap_caches_locked(inode); 206 spin_unlock(&inode->i_lock); 207 } 208 209 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 210 { 211 if (mapping->nrpages != 0) { 212 spin_lock(&inode->i_lock); 213 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 214 spin_unlock(&inode->i_lock); 215 } 216 } 217 218 void nfs_zap_acl_cache(struct inode *inode) 219 { 220 void (*clear_acl_cache)(struct inode *); 221 222 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 223 if (clear_acl_cache != NULL) 224 clear_acl_cache(inode); 225 spin_lock(&inode->i_lock); 226 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 227 spin_unlock(&inode->i_lock); 228 } 229 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 230 231 void nfs_invalidate_atime(struct inode *inode) 232 { 233 spin_lock(&inode->i_lock); 234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 235 spin_unlock(&inode->i_lock); 236 } 237 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 238 239 /* 240 * Invalidate, but do not unhash, the inode. 241 * NB: must be called with inode->i_lock held! 242 */ 243 static void nfs_invalidate_inode(struct inode *inode) 244 { 245 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 246 nfs_zap_caches_locked(inode); 247 } 248 249 struct nfs_find_desc { 250 struct nfs_fh *fh; 251 struct nfs_fattr *fattr; 252 }; 253 254 /* 255 * In NFSv3 we can have 64bit inode numbers. In order to support 256 * this, and re-exported directories (also seen in NFSv2) 257 * we are forced to allow 2 different inodes to have the same 258 * i_ino. 259 */ 260 static int 261 nfs_find_actor(struct inode *inode, void *opaque) 262 { 263 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 264 struct nfs_fh *fh = desc->fh; 265 struct nfs_fattr *fattr = desc->fattr; 266 267 if (NFS_FILEID(inode) != fattr->fileid) 268 return 0; 269 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 270 return 0; 271 if (nfs_compare_fh(NFS_FH(inode), fh)) 272 return 0; 273 if (is_bad_inode(inode) || NFS_STALE(inode)) 274 return 0; 275 return 1; 276 } 277 278 static int 279 nfs_init_locked(struct inode *inode, void *opaque) 280 { 281 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 282 struct nfs_fattr *fattr = desc->fattr; 283 284 set_nfs_fileid(inode, fattr->fileid); 285 nfs_copy_fh(NFS_FH(inode), desc->fh); 286 return 0; 287 } 288 289 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 290 static void nfs_clear_label_invalid(struct inode *inode) 291 { 292 spin_lock(&inode->i_lock); 293 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 294 spin_unlock(&inode->i_lock); 295 } 296 297 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 298 struct nfs4_label *label) 299 { 300 int error; 301 302 if (label == NULL) 303 return; 304 305 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 306 error = security_inode_notifysecctx(inode, label->label, 307 label->len); 308 if (error) 309 printk(KERN_ERR "%s() %s %d " 310 "security_inode_notifysecctx() %d\n", 311 __func__, 312 (char *)label->label, 313 label->len, error); 314 nfs_clear_label_invalid(inode); 315 } 316 } 317 318 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 319 { 320 struct nfs4_label *label = NULL; 321 int minor_version = server->nfs_client->cl_minorversion; 322 323 if (minor_version < 2) 324 return label; 325 326 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 327 return label; 328 329 label = kzalloc(sizeof(struct nfs4_label), flags); 330 if (label == NULL) 331 return ERR_PTR(-ENOMEM); 332 333 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 334 if (label->label == NULL) { 335 kfree(label); 336 return ERR_PTR(-ENOMEM); 337 } 338 label->len = NFS4_MAXLABELLEN; 339 340 return label; 341 } 342 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 343 #else 344 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 345 struct nfs4_label *label) 346 { 347 } 348 #endif 349 EXPORT_SYMBOL_GPL(nfs_setsecurity); 350 351 /* 352 * This is our front-end to iget that looks up inodes by file handle 353 * instead of inode number. 354 */ 355 struct inode * 356 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label) 357 { 358 struct nfs_find_desc desc = { 359 .fh = fh, 360 .fattr = fattr 361 }; 362 struct inode *inode = ERR_PTR(-ENOENT); 363 unsigned long hash; 364 365 nfs_attr_check_mountpoint(sb, fattr); 366 367 if (nfs_attr_use_mounted_on_fileid(fattr)) 368 fattr->fileid = fattr->mounted_on_fileid; 369 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 370 goto out_no_inode; 371 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 372 goto out_no_inode; 373 374 hash = nfs_fattr_to_ino_t(fattr); 375 376 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 377 if (inode == NULL) { 378 inode = ERR_PTR(-ENOMEM); 379 goto out_no_inode; 380 } 381 382 if (inode->i_state & I_NEW) { 383 struct nfs_inode *nfsi = NFS_I(inode); 384 unsigned long now = jiffies; 385 386 /* We set i_ino for the few things that still rely on it, 387 * such as stat(2) */ 388 inode->i_ino = hash; 389 390 /* We can't support update_atime(), since the server will reset it */ 391 inode->i_flags |= S_NOATIME|S_NOCMTIME; 392 inode->i_mode = fattr->mode; 393 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 394 && nfs_server_capable(inode, NFS_CAP_MODE)) 395 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 396 /* Why so? Because we want revalidate for devices/FIFOs, and 397 * that's precisely what we have in nfs_file_inode_operations. 398 */ 399 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 400 if (S_ISREG(inode->i_mode)) { 401 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 402 inode->i_data.a_ops = &nfs_file_aops; 403 } else if (S_ISDIR(inode->i_mode)) { 404 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 405 inode->i_fop = &nfs_dir_operations; 406 inode->i_data.a_ops = &nfs_dir_aops; 407 /* Deal with crossing mountpoints */ 408 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 409 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 410 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 411 inode->i_op = &nfs_referral_inode_operations; 412 else 413 inode->i_op = &nfs_mountpoint_inode_operations; 414 inode->i_fop = NULL; 415 inode->i_flags |= S_AUTOMOUNT; 416 } 417 } else if (S_ISLNK(inode->i_mode)) { 418 inode->i_op = &nfs_symlink_inode_operations; 419 inode_nohighmem(inode); 420 } else 421 init_special_inode(inode, inode->i_mode, fattr->rdev); 422 423 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 424 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 425 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 426 inode->i_version = 0; 427 inode->i_size = 0; 428 clear_nlink(inode); 429 inode->i_uid = make_kuid(&init_user_ns, -2); 430 inode->i_gid = make_kgid(&init_user_ns, -2); 431 inode->i_blocks = 0; 432 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 433 nfsi->write_io = 0; 434 nfsi->read_io = 0; 435 436 nfsi->read_cache_jiffies = fattr->time_start; 437 nfsi->attr_gencount = fattr->gencount; 438 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 439 inode->i_atime = fattr->atime; 440 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 441 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 442 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 443 inode->i_mtime = fattr->mtime; 444 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 445 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 446 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 447 inode->i_ctime = fattr->ctime; 448 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 449 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 450 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 451 inode->i_version = fattr->change_attr; 452 else 453 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 454 | NFS_INO_REVAL_PAGECACHE); 455 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 456 inode->i_size = nfs_size_to_loff_t(fattr->size); 457 else 458 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 459 | NFS_INO_REVAL_PAGECACHE); 460 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 461 set_nlink(inode, fattr->nlink); 462 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 463 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 464 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 465 inode->i_uid = fattr->uid; 466 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 467 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 468 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 469 inode->i_gid = fattr->gid; 470 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 471 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 472 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 473 inode->i_blocks = fattr->du.nfs2.blocks; 474 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 475 /* 476 * report the blocks in 512byte units 477 */ 478 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 479 } 480 481 nfs_setsecurity(inode, fattr, label); 482 483 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 484 nfsi->attrtimeo_timestamp = now; 485 nfsi->access_cache = RB_ROOT; 486 487 nfs_fscache_init_inode(inode); 488 489 unlock_new_inode(inode); 490 } else 491 nfs_refresh_inode(inode, fattr); 492 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 493 inode->i_sb->s_id, 494 (unsigned long long)NFS_FILEID(inode), 495 nfs_display_fhandle_hash(fh), 496 atomic_read(&inode->i_count)); 497 498 out: 499 return inode; 500 501 out_no_inode: 502 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 503 goto out; 504 } 505 EXPORT_SYMBOL_GPL(nfs_fhget); 506 507 #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) 508 509 int 510 nfs_setattr(struct dentry *dentry, struct iattr *attr) 511 { 512 struct inode *inode = d_inode(dentry); 513 struct nfs_fattr *fattr; 514 int error = 0; 515 516 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 517 518 /* skip mode change if it's just for clearing setuid/setgid */ 519 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 520 attr->ia_valid &= ~ATTR_MODE; 521 522 if (attr->ia_valid & ATTR_SIZE) { 523 BUG_ON(!S_ISREG(inode->i_mode)); 524 525 error = inode_newsize_ok(inode, attr->ia_size); 526 if (error) 527 return error; 528 529 if (attr->ia_size == i_size_read(inode)) 530 attr->ia_valid &= ~ATTR_SIZE; 531 } 532 533 /* Optimization: if the end result is no change, don't RPC */ 534 attr->ia_valid &= NFS_VALID_ATTRS; 535 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 536 return 0; 537 538 trace_nfs_setattr_enter(inode); 539 540 /* Write all dirty data */ 541 if (S_ISREG(inode->i_mode)) 542 nfs_sync_inode(inode); 543 544 fattr = nfs_alloc_fattr(); 545 if (fattr == NULL) { 546 error = -ENOMEM; 547 goto out; 548 } 549 550 /* 551 * Return any delegations if we're going to change ACLs 552 */ 553 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 554 NFS_PROTO(inode)->return_delegation(inode); 555 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 556 if (error == 0) 557 error = nfs_refresh_inode(inode, fattr); 558 nfs_free_fattr(fattr); 559 out: 560 trace_nfs_setattr_exit(inode, error); 561 return error; 562 } 563 EXPORT_SYMBOL_GPL(nfs_setattr); 564 565 /** 566 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 567 * @inode: inode of the file used 568 * @offset: file offset to start truncating 569 * 570 * This is a copy of the common vmtruncate, but with the locking 571 * corrected to take into account the fact that NFS requires 572 * inode->i_size to be updated under the inode->i_lock. 573 * Note: must be called with inode->i_lock held! 574 */ 575 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 576 { 577 int err; 578 579 err = inode_newsize_ok(inode, offset); 580 if (err) 581 goto out; 582 583 i_size_write(inode, offset); 584 /* Optimisation */ 585 if (offset == 0) 586 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 587 588 spin_unlock(&inode->i_lock); 589 truncate_pagecache(inode, offset); 590 spin_lock(&inode->i_lock); 591 out: 592 return err; 593 } 594 595 /** 596 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 597 * @inode: pointer to struct inode 598 * @attr: pointer to struct iattr 599 * 600 * Note: we do this in the *proc.c in order to ensure that 601 * it works for things like exclusive creates too. 602 */ 603 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 604 struct nfs_fattr *fattr) 605 { 606 /* Barrier: bump the attribute generation count. */ 607 nfs_fattr_set_barrier(fattr); 608 609 spin_lock(&inode->i_lock); 610 NFS_I(inode)->attr_gencount = fattr->gencount; 611 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 612 if ((attr->ia_valid & ATTR_MODE) != 0) { 613 int mode = attr->ia_mode & S_IALLUGO; 614 mode |= inode->i_mode & ~S_IALLUGO; 615 inode->i_mode = mode; 616 } 617 if ((attr->ia_valid & ATTR_UID) != 0) 618 inode->i_uid = attr->ia_uid; 619 if ((attr->ia_valid & ATTR_GID) != 0) 620 inode->i_gid = attr->ia_gid; 621 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 622 | NFS_INO_INVALID_ACL); 623 } 624 if ((attr->ia_valid & ATTR_SIZE) != 0) { 625 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 626 nfs_vmtruncate(inode, attr->ia_size); 627 } 628 if (fattr->valid) 629 nfs_update_inode(inode, fattr); 630 else 631 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR; 632 spin_unlock(&inode->i_lock); 633 } 634 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 635 636 static void nfs_request_parent_use_readdirplus(struct dentry *dentry) 637 { 638 struct dentry *parent; 639 640 parent = dget_parent(dentry); 641 nfs_force_use_readdirplus(d_inode(parent)); 642 dput(parent); 643 } 644 645 static bool nfs_need_revalidate_inode(struct inode *inode) 646 { 647 if (NFS_I(inode)->cache_validity & 648 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 649 return true; 650 if (nfs_attribute_cache_expired(inode)) 651 return true; 652 return false; 653 } 654 655 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 656 { 657 struct inode *inode = d_inode(dentry); 658 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 659 int err = 0; 660 661 trace_nfs_getattr_enter(inode); 662 /* Flush out writes to the server in order to update c/mtime. */ 663 if (S_ISREG(inode->i_mode)) { 664 inode_lock(inode); 665 err = nfs_sync_inode(inode); 666 inode_unlock(inode); 667 if (err) 668 goto out; 669 } 670 671 /* 672 * We may force a getattr if the user cares about atime. 673 * 674 * Note that we only have to check the vfsmount flags here: 675 * - NFS always sets S_NOATIME by so checking it would give a 676 * bogus result 677 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 678 * no point in checking those. 679 */ 680 if ((mnt->mnt_flags & MNT_NOATIME) || 681 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 682 need_atime = 0; 683 684 if (need_atime || nfs_need_revalidate_inode(inode)) { 685 struct nfs_server *server = NFS_SERVER(inode); 686 687 if (server->caps & NFS_CAP_READDIRPLUS) 688 nfs_request_parent_use_readdirplus(dentry); 689 err = __nfs_revalidate_inode(server, inode); 690 } 691 if (!err) { 692 generic_fillattr(inode, stat); 693 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 694 if (S_ISDIR(inode->i_mode)) 695 stat->blksize = NFS_SERVER(inode)->dtsize; 696 } 697 out: 698 trace_nfs_getattr_exit(inode, err); 699 return err; 700 } 701 EXPORT_SYMBOL_GPL(nfs_getattr); 702 703 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 704 { 705 atomic_set(&l_ctx->count, 1); 706 l_ctx->lockowner.l_owner = current->files; 707 l_ctx->lockowner.l_pid = current->tgid; 708 INIT_LIST_HEAD(&l_ctx->list); 709 atomic_set(&l_ctx->io_count, 0); 710 } 711 712 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 713 { 714 struct nfs_lock_context *head = &ctx->lock_context; 715 struct nfs_lock_context *pos = head; 716 717 do { 718 if (pos->lockowner.l_owner != current->files) 719 continue; 720 if (pos->lockowner.l_pid != current->tgid) 721 continue; 722 atomic_inc(&pos->count); 723 return pos; 724 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 725 return NULL; 726 } 727 728 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 729 { 730 struct nfs_lock_context *res, *new = NULL; 731 struct inode *inode = d_inode(ctx->dentry); 732 733 spin_lock(&inode->i_lock); 734 res = __nfs_find_lock_context(ctx); 735 if (res == NULL) { 736 spin_unlock(&inode->i_lock); 737 new = kmalloc(sizeof(*new), GFP_KERNEL); 738 if (new == NULL) 739 return ERR_PTR(-ENOMEM); 740 nfs_init_lock_context(new); 741 spin_lock(&inode->i_lock); 742 res = __nfs_find_lock_context(ctx); 743 if (res == NULL) { 744 list_add_tail(&new->list, &ctx->lock_context.list); 745 new->open_context = ctx; 746 res = new; 747 new = NULL; 748 } 749 } 750 spin_unlock(&inode->i_lock); 751 kfree(new); 752 return res; 753 } 754 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 755 756 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 757 { 758 struct nfs_open_context *ctx = l_ctx->open_context; 759 struct inode *inode = d_inode(ctx->dentry); 760 761 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 762 return; 763 list_del(&l_ctx->list); 764 spin_unlock(&inode->i_lock); 765 kfree(l_ctx); 766 } 767 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 768 769 /** 770 * nfs_close_context - Common close_context() routine NFSv2/v3 771 * @ctx: pointer to context 772 * @is_sync: is this a synchronous close 773 * 774 * Ensure that the attributes are up to date if we're mounted 775 * with close-to-open semantics and we have cached data that will 776 * need to be revalidated on open. 777 */ 778 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 779 { 780 struct nfs_inode *nfsi; 781 struct inode *inode; 782 struct nfs_server *server; 783 784 if (!(ctx->mode & FMODE_WRITE)) 785 return; 786 if (!is_sync) 787 return; 788 inode = d_inode(ctx->dentry); 789 nfsi = NFS_I(inode); 790 if (inode->i_mapping->nrpages == 0) 791 return; 792 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 793 return; 794 if (!list_empty(&nfsi->open_files)) 795 return; 796 server = NFS_SERVER(inode); 797 if (server->flags & NFS_MOUNT_NOCTO) 798 return; 799 nfs_revalidate_inode(server, inode); 800 } 801 EXPORT_SYMBOL_GPL(nfs_close_context); 802 803 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 804 { 805 struct nfs_open_context *ctx; 806 struct rpc_cred *cred = rpc_lookup_cred(); 807 if (IS_ERR(cred)) 808 return ERR_CAST(cred); 809 810 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 811 if (!ctx) { 812 put_rpccred(cred); 813 return ERR_PTR(-ENOMEM); 814 } 815 nfs_sb_active(dentry->d_sb); 816 ctx->dentry = dget(dentry); 817 ctx->cred = cred; 818 ctx->state = NULL; 819 ctx->mode = f_mode; 820 ctx->flags = 0; 821 ctx->error = 0; 822 nfs_init_lock_context(&ctx->lock_context); 823 ctx->lock_context.open_context = ctx; 824 INIT_LIST_HEAD(&ctx->list); 825 ctx->mdsthreshold = NULL; 826 return ctx; 827 } 828 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 829 830 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 831 { 832 if (ctx != NULL) 833 atomic_inc(&ctx->lock_context.count); 834 return ctx; 835 } 836 EXPORT_SYMBOL_GPL(get_nfs_open_context); 837 838 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 839 { 840 struct inode *inode = d_inode(ctx->dentry); 841 struct super_block *sb = ctx->dentry->d_sb; 842 843 if (!list_empty(&ctx->list)) { 844 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 845 return; 846 list_del(&ctx->list); 847 spin_unlock(&inode->i_lock); 848 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 849 return; 850 if (inode != NULL) 851 NFS_PROTO(inode)->close_context(ctx, is_sync); 852 if (ctx->cred != NULL) 853 put_rpccred(ctx->cred); 854 dput(ctx->dentry); 855 nfs_sb_deactive(sb); 856 kfree(ctx->mdsthreshold); 857 kfree(ctx); 858 } 859 860 void put_nfs_open_context(struct nfs_open_context *ctx) 861 { 862 __put_nfs_open_context(ctx, 0); 863 } 864 EXPORT_SYMBOL_GPL(put_nfs_open_context); 865 866 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 867 { 868 __put_nfs_open_context(ctx, 1); 869 } 870 871 /* 872 * Ensure that mmap has a recent RPC credential for use when writing out 873 * shared pages 874 */ 875 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 876 { 877 struct inode *inode = d_inode(ctx->dentry); 878 struct nfs_inode *nfsi = NFS_I(inode); 879 880 spin_lock(&inode->i_lock); 881 list_add(&ctx->list, &nfsi->open_files); 882 spin_unlock(&inode->i_lock); 883 } 884 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 885 886 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 887 { 888 filp->private_data = get_nfs_open_context(ctx); 889 if (list_empty(&ctx->list)) 890 nfs_inode_attach_open_context(ctx); 891 } 892 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 893 894 /* 895 * Given an inode, search for an open context with the desired characteristics 896 */ 897 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 898 { 899 struct nfs_inode *nfsi = NFS_I(inode); 900 struct nfs_open_context *pos, *ctx = NULL; 901 902 spin_lock(&inode->i_lock); 903 list_for_each_entry(pos, &nfsi->open_files, list) { 904 if (cred != NULL && pos->cred != cred) 905 continue; 906 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 907 continue; 908 ctx = get_nfs_open_context(pos); 909 break; 910 } 911 spin_unlock(&inode->i_lock); 912 return ctx; 913 } 914 915 void nfs_file_clear_open_context(struct file *filp) 916 { 917 struct nfs_open_context *ctx = nfs_file_open_context(filp); 918 919 if (ctx) { 920 struct inode *inode = d_inode(ctx->dentry); 921 922 /* 923 * We fatal error on write before. Try to writeback 924 * every page again. 925 */ 926 if (ctx->error < 0) 927 invalidate_inode_pages2(inode->i_mapping); 928 filp->private_data = NULL; 929 spin_lock(&inode->i_lock); 930 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 931 spin_unlock(&inode->i_lock); 932 put_nfs_open_context_sync(ctx); 933 } 934 } 935 936 /* 937 * These allocate and release file read/write context information. 938 */ 939 int nfs_open(struct inode *inode, struct file *filp) 940 { 941 struct nfs_open_context *ctx; 942 943 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 944 if (IS_ERR(ctx)) 945 return PTR_ERR(ctx); 946 nfs_file_set_open_context(filp, ctx); 947 put_nfs_open_context(ctx); 948 nfs_fscache_open_file(inode, filp); 949 return 0; 950 } 951 952 /* 953 * This function is called whenever some part of NFS notices that 954 * the cached attributes have to be refreshed. 955 */ 956 int 957 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 958 { 959 int status = -ESTALE; 960 struct nfs4_label *label = NULL; 961 struct nfs_fattr *fattr = NULL; 962 struct nfs_inode *nfsi = NFS_I(inode); 963 964 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 965 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 966 967 trace_nfs_revalidate_inode_enter(inode); 968 969 if (is_bad_inode(inode)) 970 goto out; 971 if (NFS_STALE(inode)) 972 goto out; 973 974 status = -ENOMEM; 975 fattr = nfs_alloc_fattr(); 976 if (fattr == NULL) 977 goto out; 978 979 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 980 981 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 982 if (IS_ERR(label)) { 983 status = PTR_ERR(label); 984 goto out; 985 } 986 987 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 988 if (status != 0) { 989 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 990 inode->i_sb->s_id, 991 (unsigned long long)NFS_FILEID(inode), status); 992 if (status == -ESTALE) { 993 nfs_zap_caches(inode); 994 if (!S_ISDIR(inode->i_mode)) 995 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 996 } 997 goto err_out; 998 } 999 1000 status = nfs_refresh_inode(inode, fattr); 1001 if (status) { 1002 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1003 inode->i_sb->s_id, 1004 (unsigned long long)NFS_FILEID(inode), status); 1005 goto err_out; 1006 } 1007 1008 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1009 nfs_zap_acl_cache(inode); 1010 1011 nfs_setsecurity(inode, fattr, label); 1012 1013 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1014 inode->i_sb->s_id, 1015 (unsigned long long)NFS_FILEID(inode)); 1016 1017 err_out: 1018 nfs4_label_free(label); 1019 out: 1020 nfs_free_fattr(fattr); 1021 trace_nfs_revalidate_inode_exit(inode, status); 1022 return status; 1023 } 1024 1025 int nfs_attribute_timeout(struct inode *inode) 1026 { 1027 struct nfs_inode *nfsi = NFS_I(inode); 1028 1029 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 1030 } 1031 1032 int nfs_attribute_cache_expired(struct inode *inode) 1033 { 1034 if (nfs_have_delegated_attributes(inode)) 1035 return 0; 1036 return nfs_attribute_timeout(inode); 1037 } 1038 1039 /** 1040 * nfs_revalidate_inode - Revalidate the inode attributes 1041 * @server - pointer to nfs_server struct 1042 * @inode - pointer to inode struct 1043 * 1044 * Updates inode attribute information by retrieving the data from the server. 1045 */ 1046 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1047 { 1048 if (!nfs_need_revalidate_inode(inode)) 1049 return NFS_STALE(inode) ? -ESTALE : 0; 1050 return __nfs_revalidate_inode(server, inode); 1051 } 1052 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1053 1054 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode) 1055 { 1056 if (!(NFS_I(inode)->cache_validity & 1057 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 1058 && !nfs_attribute_cache_expired(inode)) 1059 return NFS_STALE(inode) ? -ESTALE : 0; 1060 return -ECHILD; 1061 } 1062 1063 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1064 { 1065 struct nfs_inode *nfsi = NFS_I(inode); 1066 int ret; 1067 1068 if (mapping->nrpages != 0) { 1069 if (S_ISREG(inode->i_mode)) { 1070 unmap_mapping_range(mapping, 0, 0, 0); 1071 ret = nfs_sync_mapping(mapping); 1072 if (ret < 0) 1073 return ret; 1074 } 1075 ret = invalidate_inode_pages2(mapping); 1076 if (ret < 0) 1077 return ret; 1078 } 1079 if (S_ISDIR(inode->i_mode)) { 1080 spin_lock(&inode->i_lock); 1081 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1082 spin_unlock(&inode->i_lock); 1083 } 1084 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1085 nfs_fscache_wait_on_invalidate(inode); 1086 1087 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1088 inode->i_sb->s_id, 1089 (unsigned long long)NFS_FILEID(inode)); 1090 return 0; 1091 } 1092 1093 static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1094 { 1095 if (nfs_have_delegated_attributes(inode)) 1096 return false; 1097 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 1098 || nfs_attribute_timeout(inode) 1099 || NFS_STALE(inode); 1100 } 1101 1102 int nfs_revalidate_mapping_rcu(struct inode *inode) 1103 { 1104 struct nfs_inode *nfsi = NFS_I(inode); 1105 unsigned long *bitlock = &nfsi->flags; 1106 int ret = 0; 1107 1108 if (IS_SWAPFILE(inode)) 1109 goto out; 1110 if (nfs_mapping_need_revalidate_inode(inode)) { 1111 ret = -ECHILD; 1112 goto out; 1113 } 1114 spin_lock(&inode->i_lock); 1115 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1116 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1117 ret = -ECHILD; 1118 spin_unlock(&inode->i_lock); 1119 out: 1120 return ret; 1121 } 1122 1123 /** 1124 * __nfs_revalidate_mapping - Revalidate the pagecache 1125 * @inode - pointer to host inode 1126 * @mapping - pointer to mapping 1127 * @may_lock - take inode->i_mutex? 1128 */ 1129 static int __nfs_revalidate_mapping(struct inode *inode, 1130 struct address_space *mapping, 1131 bool may_lock) 1132 { 1133 struct nfs_inode *nfsi = NFS_I(inode); 1134 unsigned long *bitlock = &nfsi->flags; 1135 int ret = 0; 1136 1137 /* swapfiles are not supposed to be shared. */ 1138 if (IS_SWAPFILE(inode)) 1139 goto out; 1140 1141 if (nfs_mapping_need_revalidate_inode(inode)) { 1142 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1143 if (ret < 0) 1144 goto out; 1145 } 1146 1147 /* 1148 * We must clear NFS_INO_INVALID_DATA first to ensure that 1149 * invalidations that come in while we're shooting down the mappings 1150 * are respected. But, that leaves a race window where one revalidator 1151 * can clear the flag, and then another checks it before the mapping 1152 * gets invalidated. Fix that by serializing access to this part of 1153 * the function. 1154 * 1155 * At the same time, we need to allow other tasks to see whether we 1156 * might be in the middle of invalidating the pages, so we only set 1157 * the bit lock here if it looks like we're going to be doing that. 1158 */ 1159 for (;;) { 1160 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1161 nfs_wait_bit_killable, TASK_KILLABLE); 1162 if (ret) 1163 goto out; 1164 spin_lock(&inode->i_lock); 1165 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1166 spin_unlock(&inode->i_lock); 1167 continue; 1168 } 1169 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1170 break; 1171 spin_unlock(&inode->i_lock); 1172 goto out; 1173 } 1174 1175 set_bit(NFS_INO_INVALIDATING, bitlock); 1176 smp_wmb(); 1177 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1178 spin_unlock(&inode->i_lock); 1179 trace_nfs_invalidate_mapping_enter(inode); 1180 if (may_lock) { 1181 inode_lock(inode); 1182 ret = nfs_invalidate_mapping(inode, mapping); 1183 inode_unlock(inode); 1184 } else 1185 ret = nfs_invalidate_mapping(inode, mapping); 1186 trace_nfs_invalidate_mapping_exit(inode, ret); 1187 1188 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1189 smp_mb__after_atomic(); 1190 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1191 out: 1192 return ret; 1193 } 1194 1195 /** 1196 * nfs_revalidate_mapping - Revalidate the pagecache 1197 * @inode - pointer to host inode 1198 * @mapping - pointer to mapping 1199 */ 1200 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1201 { 1202 return __nfs_revalidate_mapping(inode, mapping, false); 1203 } 1204 1205 /** 1206 * nfs_revalidate_mapping_protected - Revalidate the pagecache 1207 * @inode - pointer to host inode 1208 * @mapping - pointer to mapping 1209 * 1210 * Differs from nfs_revalidate_mapping() in that it grabs the inode->i_mutex 1211 * while invalidating the mapping. 1212 */ 1213 int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping) 1214 { 1215 return __nfs_revalidate_mapping(inode, mapping, true); 1216 } 1217 1218 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1219 { 1220 struct nfs_inode *nfsi = NFS_I(inode); 1221 unsigned long ret = 0; 1222 1223 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1224 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1225 && inode->i_version == fattr->pre_change_attr) { 1226 inode->i_version = fattr->change_attr; 1227 if (S_ISDIR(inode->i_mode)) 1228 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1229 ret |= NFS_INO_INVALID_ATTR; 1230 } 1231 /* If we have atomic WCC data, we may update some attributes */ 1232 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1233 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1234 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1235 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1236 ret |= NFS_INO_INVALID_ATTR; 1237 } 1238 1239 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1240 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1241 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1242 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1243 if (S_ISDIR(inode->i_mode)) 1244 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1245 ret |= NFS_INO_INVALID_ATTR; 1246 } 1247 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1248 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1249 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1250 && nfsi->nrequests == 0) { 1251 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1252 ret |= NFS_INO_INVALID_ATTR; 1253 } 1254 1255 return ret; 1256 } 1257 1258 /** 1259 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1260 * @inode - pointer to inode 1261 * @fattr - updated attributes 1262 * 1263 * Verifies the attribute cache. If we have just changed the attributes, 1264 * so that fattr carries weak cache consistency data, then it may 1265 * also update the ctime/mtime/change_attribute. 1266 */ 1267 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1268 { 1269 struct nfs_inode *nfsi = NFS_I(inode); 1270 loff_t cur_size, new_isize; 1271 unsigned long invalid = 0; 1272 1273 1274 if (nfs_have_delegated_attributes(inode)) 1275 return 0; 1276 /* Has the inode gone and changed behind our back? */ 1277 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1278 return -EIO; 1279 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1280 return -EIO; 1281 1282 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1283 inode->i_version != fattr->change_attr) 1284 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1285 1286 /* Verify a few of the more important attributes */ 1287 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1288 invalid |= NFS_INO_INVALID_ATTR; 1289 1290 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1291 cur_size = i_size_read(inode); 1292 new_isize = nfs_size_to_loff_t(fattr->size); 1293 if (cur_size != new_isize) 1294 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1295 } 1296 if (nfsi->nrequests != 0) 1297 invalid &= ~NFS_INO_REVAL_PAGECACHE; 1298 1299 /* Have any file permissions changed? */ 1300 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1301 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1302 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1303 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1304 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1305 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1306 1307 /* Has the link count changed? */ 1308 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1309 invalid |= NFS_INO_INVALID_ATTR; 1310 1311 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1312 invalid |= NFS_INO_INVALID_ATIME; 1313 1314 if (invalid != 0) 1315 nfs_set_cache_invalid(inode, invalid); 1316 1317 nfsi->read_cache_jiffies = fattr->time_start; 1318 return 0; 1319 } 1320 1321 static atomic_long_t nfs_attr_generation_counter; 1322 1323 static unsigned long nfs_read_attr_generation_counter(void) 1324 { 1325 return atomic_long_read(&nfs_attr_generation_counter); 1326 } 1327 1328 unsigned long nfs_inc_attr_generation_counter(void) 1329 { 1330 return atomic_long_inc_return(&nfs_attr_generation_counter); 1331 } 1332 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1333 1334 void nfs_fattr_init(struct nfs_fattr *fattr) 1335 { 1336 fattr->valid = 0; 1337 fattr->time_start = jiffies; 1338 fattr->gencount = nfs_inc_attr_generation_counter(); 1339 fattr->owner_name = NULL; 1340 fattr->group_name = NULL; 1341 } 1342 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1343 1344 /** 1345 * nfs_fattr_set_barrier 1346 * @fattr: attributes 1347 * 1348 * Used to set a barrier after an attribute was updated. This 1349 * barrier ensures that older attributes from RPC calls that may 1350 * have raced with our update cannot clobber these new values. 1351 * Note that you are still responsible for ensuring that other 1352 * operations which change the attribute on the server do not 1353 * collide. 1354 */ 1355 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1356 { 1357 fattr->gencount = nfs_inc_attr_generation_counter(); 1358 } 1359 1360 struct nfs_fattr *nfs_alloc_fattr(void) 1361 { 1362 struct nfs_fattr *fattr; 1363 1364 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1365 if (fattr != NULL) 1366 nfs_fattr_init(fattr); 1367 return fattr; 1368 } 1369 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1370 1371 struct nfs_fh *nfs_alloc_fhandle(void) 1372 { 1373 struct nfs_fh *fh; 1374 1375 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1376 if (fh != NULL) 1377 fh->size = 0; 1378 return fh; 1379 } 1380 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1381 1382 #ifdef NFS_DEBUG 1383 /* 1384 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1385 * in the same way that wireshark does 1386 * 1387 * @fh: file handle 1388 * 1389 * For debugging only. 1390 */ 1391 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1392 { 1393 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1394 * not on the result */ 1395 return nfs_fhandle_hash(fh); 1396 } 1397 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1398 1399 /* 1400 * _nfs_display_fhandle - display an NFS file handle on the console 1401 * 1402 * @fh: file handle to display 1403 * @caption: display caption 1404 * 1405 * For debugging only. 1406 */ 1407 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1408 { 1409 unsigned short i; 1410 1411 if (fh == NULL || fh->size == 0) { 1412 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1413 return; 1414 } 1415 1416 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1417 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1418 for (i = 0; i < fh->size; i += 16) { 1419 __be32 *pos = (__be32 *)&fh->data[i]; 1420 1421 switch ((fh->size - i - 1) >> 2) { 1422 case 0: 1423 printk(KERN_DEFAULT " %08x\n", 1424 be32_to_cpup(pos)); 1425 break; 1426 case 1: 1427 printk(KERN_DEFAULT " %08x %08x\n", 1428 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1429 break; 1430 case 2: 1431 printk(KERN_DEFAULT " %08x %08x %08x\n", 1432 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1433 be32_to_cpup(pos + 2)); 1434 break; 1435 default: 1436 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1437 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1438 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1439 } 1440 } 1441 } 1442 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1443 #endif 1444 1445 /** 1446 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1447 * @inode - pointer to inode 1448 * @fattr - attributes 1449 * 1450 * Attempt to divine whether or not an RPC call reply carrying stale 1451 * attributes got scheduled after another call carrying updated ones. 1452 * 1453 * To do so, the function first assumes that a more recent ctime means 1454 * that the attributes in fattr are newer, however it also attempt to 1455 * catch the case where ctime either didn't change, or went backwards 1456 * (if someone reset the clock on the server) by looking at whether 1457 * or not this RPC call was started after the inode was last updated. 1458 * Note also the check for wraparound of 'attr_gencount' 1459 * 1460 * The function returns 'true' if it thinks the attributes in 'fattr' are 1461 * more recent than the ones cached in the inode. 1462 * 1463 */ 1464 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1465 { 1466 const struct nfs_inode *nfsi = NFS_I(inode); 1467 1468 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1469 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1470 } 1471 1472 /* 1473 * Don't trust the change_attribute, mtime, ctime or size if 1474 * a pnfs LAYOUTCOMMIT is outstanding 1475 */ 1476 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode, 1477 struct nfs_fattr *fattr) 1478 { 1479 if (pnfs_layoutcommit_outstanding(inode)) 1480 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE | 1481 NFS_ATTR_FATTR_MTIME | 1482 NFS_ATTR_FATTR_CTIME | 1483 NFS_ATTR_FATTR_SIZE); 1484 } 1485 1486 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1487 { 1488 int ret; 1489 1490 trace_nfs_refresh_inode_enter(inode); 1491 1492 nfs_inode_attrs_handle_layoutcommit(inode, fattr); 1493 1494 if (nfs_inode_attrs_need_update(inode, fattr)) 1495 ret = nfs_update_inode(inode, fattr); 1496 else 1497 ret = nfs_check_inode_attributes(inode, fattr); 1498 1499 trace_nfs_refresh_inode_exit(inode, ret); 1500 return ret; 1501 } 1502 1503 /** 1504 * nfs_refresh_inode - try to update the inode attribute cache 1505 * @inode - pointer to inode 1506 * @fattr - updated attributes 1507 * 1508 * Check that an RPC call that returned attributes has not overlapped with 1509 * other recent updates of the inode metadata, then decide whether it is 1510 * safe to do a full update of the inode attributes, or whether just to 1511 * call nfs_check_inode_attributes. 1512 */ 1513 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1514 { 1515 int status; 1516 1517 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1518 return 0; 1519 spin_lock(&inode->i_lock); 1520 status = nfs_refresh_inode_locked(inode, fattr); 1521 spin_unlock(&inode->i_lock); 1522 1523 return status; 1524 } 1525 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1526 1527 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1528 { 1529 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1530 1531 /* 1532 * Don't revalidate the pagecache if we hold a delegation, but do 1533 * force an attribute update 1534 */ 1535 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1536 invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED; 1537 1538 if (S_ISDIR(inode->i_mode)) 1539 invalid |= NFS_INO_INVALID_DATA; 1540 nfs_set_cache_invalid(inode, invalid); 1541 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1542 return 0; 1543 return nfs_refresh_inode_locked(inode, fattr); 1544 } 1545 1546 /** 1547 * nfs_post_op_update_inode - try to update the inode attribute cache 1548 * @inode - pointer to inode 1549 * @fattr - updated attributes 1550 * 1551 * After an operation that has changed the inode metadata, mark the 1552 * attribute cache as being invalid, then try to update it. 1553 * 1554 * NB: if the server didn't return any post op attributes, this 1555 * function will force the retrieval of attributes before the next 1556 * NFS request. Thus it should be used only for operations that 1557 * are expected to change one or more attributes, to avoid 1558 * unnecessary NFS requests and trips through nfs_update_inode(). 1559 */ 1560 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1561 { 1562 int status; 1563 1564 spin_lock(&inode->i_lock); 1565 nfs_fattr_set_barrier(fattr); 1566 status = nfs_post_op_update_inode_locked(inode, fattr); 1567 spin_unlock(&inode->i_lock); 1568 1569 return status; 1570 } 1571 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1572 1573 /** 1574 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1575 * @inode - pointer to inode 1576 * @fattr - updated attributes 1577 * 1578 * After an operation that has changed the inode metadata, mark the 1579 * attribute cache as being invalid, then try to update it. Fake up 1580 * weak cache consistency data, if none exist. 1581 * 1582 * This function is mainly designed to be used by the ->write_done() functions. 1583 */ 1584 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1585 { 1586 int status; 1587 1588 /* Don't do a WCC update if these attributes are already stale */ 1589 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1590 !nfs_inode_attrs_need_update(inode, fattr)) { 1591 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1592 | NFS_ATTR_FATTR_PRESIZE 1593 | NFS_ATTR_FATTR_PREMTIME 1594 | NFS_ATTR_FATTR_PRECTIME); 1595 goto out_noforce; 1596 } 1597 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1598 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1599 fattr->pre_change_attr = inode->i_version; 1600 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1601 } 1602 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1603 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1604 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1605 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1606 } 1607 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1608 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1609 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1610 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1611 } 1612 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1613 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1614 fattr->pre_size = i_size_read(inode); 1615 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1616 } 1617 out_noforce: 1618 status = nfs_post_op_update_inode_locked(inode, fattr); 1619 return status; 1620 } 1621 1622 /** 1623 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1624 * @inode - pointer to inode 1625 * @fattr - updated attributes 1626 * 1627 * After an operation that has changed the inode metadata, mark the 1628 * attribute cache as being invalid, then try to update it. Fake up 1629 * weak cache consistency data, if none exist. 1630 * 1631 * This function is mainly designed to be used by the ->write_done() functions. 1632 */ 1633 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1634 { 1635 int status; 1636 1637 spin_lock(&inode->i_lock); 1638 nfs_fattr_set_barrier(fattr); 1639 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1640 spin_unlock(&inode->i_lock); 1641 return status; 1642 } 1643 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1644 1645 1646 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1647 struct nfs_fattr *fattr) 1648 { 1649 bool ret1 = true, ret2 = true; 1650 1651 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1652 ret1 = (nfsi->fileid == fattr->fileid); 1653 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1654 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1655 return ret1 || ret2; 1656 } 1657 1658 /* 1659 * Many nfs protocol calls return the new file attributes after 1660 * an operation. Here we update the inode to reflect the state 1661 * of the server's inode. 1662 * 1663 * This is a bit tricky because we have to make sure all dirty pages 1664 * have been sent off to the server before calling invalidate_inode_pages. 1665 * To make sure no other process adds more write requests while we try 1666 * our best to flush them, we make them sleep during the attribute refresh. 1667 * 1668 * A very similar scenario holds for the dir cache. 1669 */ 1670 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1671 { 1672 struct nfs_server *server; 1673 struct nfs_inode *nfsi = NFS_I(inode); 1674 loff_t cur_isize, new_isize; 1675 unsigned long invalid = 0; 1676 unsigned long now = jiffies; 1677 unsigned long save_cache_validity; 1678 bool cache_revalidated = true; 1679 1680 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1681 __func__, inode->i_sb->s_id, inode->i_ino, 1682 nfs_display_fhandle_hash(NFS_FH(inode)), 1683 atomic_read(&inode->i_count), fattr->valid); 1684 1685 if (!nfs_fileid_valid(nfsi, fattr)) { 1686 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1687 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1688 NFS_SERVER(inode)->nfs_client->cl_hostname, 1689 inode->i_sb->s_id, (long long)nfsi->fileid, 1690 (long long)fattr->fileid); 1691 goto out_err; 1692 } 1693 1694 /* 1695 * Make sure the inode's type hasn't changed. 1696 */ 1697 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1698 /* 1699 * Big trouble! The inode has become a different object. 1700 */ 1701 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1702 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1703 goto out_err; 1704 } 1705 1706 server = NFS_SERVER(inode); 1707 /* Update the fsid? */ 1708 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1709 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1710 !IS_AUTOMOUNT(inode)) 1711 server->fsid = fattr->fsid; 1712 1713 /* 1714 * Update the read time so we don't revalidate too often. 1715 */ 1716 nfsi->read_cache_jiffies = fattr->time_start; 1717 1718 save_cache_validity = nfsi->cache_validity; 1719 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1720 | NFS_INO_INVALID_ATIME 1721 | NFS_INO_REVAL_FORCED 1722 | NFS_INO_REVAL_PAGECACHE); 1723 1724 /* Do atomic weak cache consistency updates */ 1725 invalid |= nfs_wcc_update_inode(inode, fattr); 1726 1727 /* More cache consistency checks */ 1728 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1729 if (inode->i_version != fattr->change_attr) { 1730 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1731 inode->i_sb->s_id, inode->i_ino); 1732 invalid |= NFS_INO_INVALID_ATTR 1733 | NFS_INO_INVALID_DATA 1734 | NFS_INO_INVALID_ACCESS 1735 | NFS_INO_INVALID_ACL; 1736 if (S_ISDIR(inode->i_mode)) 1737 nfs_force_lookup_revalidate(inode); 1738 inode->i_version = fattr->change_attr; 1739 } 1740 } else { 1741 nfsi->cache_validity |= save_cache_validity; 1742 cache_revalidated = false; 1743 } 1744 1745 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1746 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1747 } else if (server->caps & NFS_CAP_MTIME) { 1748 nfsi->cache_validity |= save_cache_validity & 1749 (NFS_INO_INVALID_ATTR 1750 | NFS_INO_REVAL_FORCED); 1751 cache_revalidated = false; 1752 } 1753 1754 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1755 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1756 } else if (server->caps & NFS_CAP_CTIME) { 1757 nfsi->cache_validity |= save_cache_validity & 1758 (NFS_INO_INVALID_ATTR 1759 | NFS_INO_REVAL_FORCED); 1760 cache_revalidated = false; 1761 } 1762 1763 /* Check if our cached file size is stale */ 1764 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1765 new_isize = nfs_size_to_loff_t(fattr->size); 1766 cur_isize = i_size_read(inode); 1767 if (new_isize != cur_isize) { 1768 /* Do we perhaps have any outstanding writes, or has 1769 * the file grown beyond our last write? */ 1770 if ((nfsi->nrequests == 0) || new_isize > cur_isize) { 1771 i_size_write(inode, new_isize); 1772 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1773 } 1774 dprintk("NFS: isize change on server for file %s/%ld " 1775 "(%Ld to %Ld)\n", 1776 inode->i_sb->s_id, 1777 inode->i_ino, 1778 (long long)cur_isize, 1779 (long long)new_isize); 1780 } 1781 } else { 1782 nfsi->cache_validity |= save_cache_validity & 1783 (NFS_INO_INVALID_ATTR 1784 | NFS_INO_REVAL_PAGECACHE 1785 | NFS_INO_REVAL_FORCED); 1786 cache_revalidated = false; 1787 } 1788 1789 1790 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1791 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1792 else if (server->caps & NFS_CAP_ATIME) { 1793 nfsi->cache_validity |= save_cache_validity & 1794 (NFS_INO_INVALID_ATIME 1795 | NFS_INO_REVAL_FORCED); 1796 cache_revalidated = false; 1797 } 1798 1799 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1800 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1801 umode_t newmode = inode->i_mode & S_IFMT; 1802 newmode |= fattr->mode & S_IALLUGO; 1803 inode->i_mode = newmode; 1804 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1805 } 1806 } else if (server->caps & NFS_CAP_MODE) { 1807 nfsi->cache_validity |= save_cache_validity & 1808 (NFS_INO_INVALID_ATTR 1809 | NFS_INO_INVALID_ACCESS 1810 | NFS_INO_INVALID_ACL 1811 | NFS_INO_REVAL_FORCED); 1812 cache_revalidated = false; 1813 } 1814 1815 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1816 if (!uid_eq(inode->i_uid, fattr->uid)) { 1817 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1818 inode->i_uid = fattr->uid; 1819 } 1820 } else if (server->caps & NFS_CAP_OWNER) { 1821 nfsi->cache_validity |= save_cache_validity & 1822 (NFS_INO_INVALID_ATTR 1823 | NFS_INO_INVALID_ACCESS 1824 | NFS_INO_INVALID_ACL 1825 | NFS_INO_REVAL_FORCED); 1826 cache_revalidated = false; 1827 } 1828 1829 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1830 if (!gid_eq(inode->i_gid, fattr->gid)) { 1831 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1832 inode->i_gid = fattr->gid; 1833 } 1834 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1835 nfsi->cache_validity |= save_cache_validity & 1836 (NFS_INO_INVALID_ATTR 1837 | NFS_INO_INVALID_ACCESS 1838 | NFS_INO_INVALID_ACL 1839 | NFS_INO_REVAL_FORCED); 1840 cache_revalidated = false; 1841 } 1842 1843 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1844 if (inode->i_nlink != fattr->nlink) { 1845 invalid |= NFS_INO_INVALID_ATTR; 1846 if (S_ISDIR(inode->i_mode)) 1847 invalid |= NFS_INO_INVALID_DATA; 1848 set_nlink(inode, fattr->nlink); 1849 } 1850 } else if (server->caps & NFS_CAP_NLINK) { 1851 nfsi->cache_validity |= save_cache_validity & 1852 (NFS_INO_INVALID_ATTR 1853 | NFS_INO_REVAL_FORCED); 1854 cache_revalidated = false; 1855 } 1856 1857 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1858 /* 1859 * report the blocks in 512byte units 1860 */ 1861 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1862 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1863 inode->i_blocks = fattr->du.nfs2.blocks; 1864 else 1865 cache_revalidated = false; 1866 1867 /* Update attrtimeo value if we're out of the unstable period */ 1868 if (invalid & NFS_INO_INVALID_ATTR) { 1869 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1870 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1871 nfsi->attrtimeo_timestamp = now; 1872 /* Set barrier to be more recent than all outstanding updates */ 1873 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1874 } else { 1875 if (cache_revalidated) { 1876 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 1877 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1878 nfsi->attrtimeo <<= 1; 1879 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 1880 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1881 } 1882 nfsi->attrtimeo_timestamp = now; 1883 } 1884 /* Set the barrier to be more recent than this fattr */ 1885 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 1886 nfsi->attr_gencount = fattr->gencount; 1887 } 1888 1889 /* Don't declare attrcache up to date if there were no attrs! */ 1890 if (cache_revalidated) 1891 invalid &= ~NFS_INO_INVALID_ATTR; 1892 1893 /* Don't invalidate the data if we were to blame */ 1894 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1895 || S_ISLNK(inode->i_mode))) 1896 invalid &= ~NFS_INO_INVALID_DATA; 1897 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1898 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1899 nfs_set_cache_invalid(inode, invalid); 1900 1901 return 0; 1902 out_err: 1903 /* 1904 * No need to worry about unhashing the dentry, as the 1905 * lookup validation will know that the inode is bad. 1906 * (But we fall through to invalidate the caches.) 1907 */ 1908 nfs_invalidate_inode(inode); 1909 return -ESTALE; 1910 } 1911 1912 struct inode *nfs_alloc_inode(struct super_block *sb) 1913 { 1914 struct nfs_inode *nfsi; 1915 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1916 if (!nfsi) 1917 return NULL; 1918 nfsi->flags = 0UL; 1919 nfsi->cache_validity = 0UL; 1920 #if IS_ENABLED(CONFIG_NFS_V4) 1921 nfsi->nfs4_acl = NULL; 1922 #endif /* CONFIG_NFS_V4 */ 1923 return &nfsi->vfs_inode; 1924 } 1925 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1926 1927 static void nfs_i_callback(struct rcu_head *head) 1928 { 1929 struct inode *inode = container_of(head, struct inode, i_rcu); 1930 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1931 } 1932 1933 void nfs_destroy_inode(struct inode *inode) 1934 { 1935 call_rcu(&inode->i_rcu, nfs_i_callback); 1936 } 1937 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1938 1939 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1940 { 1941 #if IS_ENABLED(CONFIG_NFS_V4) 1942 INIT_LIST_HEAD(&nfsi->open_states); 1943 nfsi->delegation = NULL; 1944 init_rwsem(&nfsi->rwsem); 1945 nfsi->layout = NULL; 1946 #endif 1947 } 1948 1949 static void init_once(void *foo) 1950 { 1951 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1952 1953 inode_init_once(&nfsi->vfs_inode); 1954 INIT_LIST_HEAD(&nfsi->open_files); 1955 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1956 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1957 INIT_LIST_HEAD(&nfsi->commit_info.list); 1958 nfsi->nrequests = 0; 1959 nfsi->commit_info.ncommit = 0; 1960 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1961 atomic_set(&nfsi->silly_count, 1); 1962 INIT_HLIST_HEAD(&nfsi->silly_list); 1963 init_waitqueue_head(&nfsi->waitqueue); 1964 nfs4_init_once(nfsi); 1965 } 1966 1967 static int __init nfs_init_inodecache(void) 1968 { 1969 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1970 sizeof(struct nfs_inode), 1971 0, (SLAB_RECLAIM_ACCOUNT| 1972 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 1973 init_once); 1974 if (nfs_inode_cachep == NULL) 1975 return -ENOMEM; 1976 1977 return 0; 1978 } 1979 1980 static void nfs_destroy_inodecache(void) 1981 { 1982 /* 1983 * Make sure all delayed rcu free inodes are flushed before we 1984 * destroy cache. 1985 */ 1986 rcu_barrier(); 1987 kmem_cache_destroy(nfs_inode_cachep); 1988 } 1989 1990 struct workqueue_struct *nfsiod_workqueue; 1991 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1992 1993 /* 1994 * start up the nfsiod workqueue 1995 */ 1996 static int nfsiod_start(void) 1997 { 1998 struct workqueue_struct *wq; 1999 dprintk("RPC: creating workqueue nfsiod\n"); 2000 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2001 if (wq == NULL) 2002 return -ENOMEM; 2003 nfsiod_workqueue = wq; 2004 return 0; 2005 } 2006 2007 /* 2008 * Destroy the nfsiod workqueue 2009 */ 2010 static void nfsiod_stop(void) 2011 { 2012 struct workqueue_struct *wq; 2013 2014 wq = nfsiod_workqueue; 2015 if (wq == NULL) 2016 return; 2017 nfsiod_workqueue = NULL; 2018 destroy_workqueue(wq); 2019 } 2020 2021 int nfs_net_id; 2022 EXPORT_SYMBOL_GPL(nfs_net_id); 2023 2024 static int nfs_net_init(struct net *net) 2025 { 2026 nfs_clients_init(net); 2027 return nfs_fs_proc_net_init(net); 2028 } 2029 2030 static void nfs_net_exit(struct net *net) 2031 { 2032 nfs_fs_proc_net_exit(net); 2033 nfs_cleanup_cb_ident_idr(net); 2034 } 2035 2036 static struct pernet_operations nfs_net_ops = { 2037 .init = nfs_net_init, 2038 .exit = nfs_net_exit, 2039 .id = &nfs_net_id, 2040 .size = sizeof(struct nfs_net), 2041 }; 2042 2043 /* 2044 * Initialize NFS 2045 */ 2046 static int __init init_nfs_fs(void) 2047 { 2048 int err; 2049 2050 err = register_pernet_subsys(&nfs_net_ops); 2051 if (err < 0) 2052 goto out9; 2053 2054 err = nfs_fscache_register(); 2055 if (err < 0) 2056 goto out8; 2057 2058 err = nfsiod_start(); 2059 if (err) 2060 goto out7; 2061 2062 err = nfs_fs_proc_init(); 2063 if (err) 2064 goto out6; 2065 2066 err = nfs_init_nfspagecache(); 2067 if (err) 2068 goto out5; 2069 2070 err = nfs_init_inodecache(); 2071 if (err) 2072 goto out4; 2073 2074 err = nfs_init_readpagecache(); 2075 if (err) 2076 goto out3; 2077 2078 err = nfs_init_writepagecache(); 2079 if (err) 2080 goto out2; 2081 2082 err = nfs_init_directcache(); 2083 if (err) 2084 goto out1; 2085 2086 rpc_proc_register(&init_net, &nfs_rpcstat); 2087 2088 err = register_nfs_fs(); 2089 if (err) 2090 goto out0; 2091 2092 return 0; 2093 out0: 2094 rpc_proc_unregister(&init_net, "nfs"); 2095 nfs_destroy_directcache(); 2096 out1: 2097 nfs_destroy_writepagecache(); 2098 out2: 2099 nfs_destroy_readpagecache(); 2100 out3: 2101 nfs_destroy_inodecache(); 2102 out4: 2103 nfs_destroy_nfspagecache(); 2104 out5: 2105 nfs_fs_proc_exit(); 2106 out6: 2107 nfsiod_stop(); 2108 out7: 2109 nfs_fscache_unregister(); 2110 out8: 2111 unregister_pernet_subsys(&nfs_net_ops); 2112 out9: 2113 return err; 2114 } 2115 2116 static void __exit exit_nfs_fs(void) 2117 { 2118 nfs_destroy_directcache(); 2119 nfs_destroy_writepagecache(); 2120 nfs_destroy_readpagecache(); 2121 nfs_destroy_inodecache(); 2122 nfs_destroy_nfspagecache(); 2123 nfs_fscache_unregister(); 2124 unregister_pernet_subsys(&nfs_net_ops); 2125 rpc_proc_unregister(&init_net, "nfs"); 2126 unregister_nfs_fs(); 2127 nfs_fs_proc_exit(); 2128 nfsiod_stop(); 2129 } 2130 2131 /* Not quite true; I just maintain it */ 2132 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2133 MODULE_LICENSE("GPL"); 2134 module_param(enable_ino64, bool, 0644); 2135 2136 module_init(init_nfs_fs) 2137 module_exit(exit_nfs_fs) 2138