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