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