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_readdirplus_parent_cache_miss(struct dentry *dentry) 638 { 639 struct dentry *parent; 640 641 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 642 return; 643 parent = dget_parent(dentry); 644 nfs_force_use_readdirplus(d_inode(parent)); 645 dput(parent); 646 } 647 648 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) 649 { 650 struct dentry *parent; 651 652 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS)) 653 return; 654 parent = dget_parent(dentry); 655 nfs_advise_use_readdirplus(d_inode(parent)); 656 dput(parent); 657 } 658 659 static bool nfs_need_revalidate_inode(struct inode *inode) 660 { 661 if (NFS_I(inode)->cache_validity & 662 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 663 return true; 664 if (nfs_attribute_cache_expired(inode)) 665 return true; 666 return false; 667 } 668 669 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 670 { 671 struct inode *inode = d_inode(dentry); 672 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 673 int err = 0; 674 675 trace_nfs_getattr_enter(inode); 676 /* Flush out writes to the server in order to update c/mtime. */ 677 if (S_ISREG(inode->i_mode)) { 678 err = filemap_write_and_wait(inode->i_mapping); 679 if (err) 680 goto out; 681 } 682 683 /* 684 * We may force a getattr if the user cares about atime. 685 * 686 * Note that we only have to check the vfsmount flags here: 687 * - NFS always sets S_NOATIME by so checking it would give a 688 * bogus result 689 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 690 * no point in checking those. 691 */ 692 if ((mnt->mnt_flags & MNT_NOATIME) || 693 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 694 need_atime = 0; 695 696 if (need_atime || nfs_need_revalidate_inode(inode)) { 697 struct nfs_server *server = NFS_SERVER(inode); 698 699 nfs_readdirplus_parent_cache_miss(dentry); 700 err = __nfs_revalidate_inode(server, inode); 701 } else 702 nfs_readdirplus_parent_cache_hit(dentry); 703 if (!err) { 704 generic_fillattr(inode, stat); 705 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 706 if (S_ISDIR(inode->i_mode)) 707 stat->blksize = NFS_SERVER(inode)->dtsize; 708 } 709 out: 710 trace_nfs_getattr_exit(inode, err); 711 return err; 712 } 713 EXPORT_SYMBOL_GPL(nfs_getattr); 714 715 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 716 { 717 atomic_set(&l_ctx->count, 1); 718 l_ctx->lockowner = current->files; 719 INIT_LIST_HEAD(&l_ctx->list); 720 atomic_set(&l_ctx->io_count, 0); 721 } 722 723 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 724 { 725 struct nfs_lock_context *head = &ctx->lock_context; 726 struct nfs_lock_context *pos = head; 727 728 do { 729 if (pos->lockowner != current->files) 730 continue; 731 atomic_inc(&pos->count); 732 return pos; 733 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 734 return NULL; 735 } 736 737 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 738 { 739 struct nfs_lock_context *res, *new = NULL; 740 struct inode *inode = d_inode(ctx->dentry); 741 742 spin_lock(&inode->i_lock); 743 res = __nfs_find_lock_context(ctx); 744 if (res == NULL) { 745 spin_unlock(&inode->i_lock); 746 new = kmalloc(sizeof(*new), GFP_KERNEL); 747 if (new == NULL) 748 return ERR_PTR(-ENOMEM); 749 nfs_init_lock_context(new); 750 spin_lock(&inode->i_lock); 751 res = __nfs_find_lock_context(ctx); 752 if (res == NULL) { 753 list_add_tail(&new->list, &ctx->lock_context.list); 754 new->open_context = ctx; 755 res = new; 756 new = NULL; 757 } 758 } 759 spin_unlock(&inode->i_lock); 760 kfree(new); 761 return res; 762 } 763 EXPORT_SYMBOL_GPL(nfs_get_lock_context); 764 765 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 766 { 767 struct nfs_open_context *ctx = l_ctx->open_context; 768 struct inode *inode = d_inode(ctx->dentry); 769 770 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 771 return; 772 list_del(&l_ctx->list); 773 spin_unlock(&inode->i_lock); 774 kfree(l_ctx); 775 } 776 EXPORT_SYMBOL_GPL(nfs_put_lock_context); 777 778 /** 779 * nfs_close_context - Common close_context() routine NFSv2/v3 780 * @ctx: pointer to context 781 * @is_sync: is this a synchronous close 782 * 783 * Ensure that the attributes are up to date if we're mounted 784 * with close-to-open semantics and we have cached data that will 785 * need to be revalidated on open. 786 */ 787 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 788 { 789 struct nfs_inode *nfsi; 790 struct inode *inode; 791 struct nfs_server *server; 792 793 if (!(ctx->mode & FMODE_WRITE)) 794 return; 795 if (!is_sync) 796 return; 797 inode = d_inode(ctx->dentry); 798 nfsi = NFS_I(inode); 799 if (inode->i_mapping->nrpages == 0) 800 return; 801 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 802 return; 803 if (!list_empty(&nfsi->open_files)) 804 return; 805 server = NFS_SERVER(inode); 806 if (server->flags & NFS_MOUNT_NOCTO) 807 return; 808 nfs_revalidate_inode(server, inode); 809 } 810 EXPORT_SYMBOL_GPL(nfs_close_context); 811 812 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, 813 fmode_t f_mode, 814 struct file *filp) 815 { 816 struct nfs_open_context *ctx; 817 struct rpc_cred *cred = rpc_lookup_cred(); 818 if (IS_ERR(cred)) 819 return ERR_CAST(cred); 820 821 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 822 if (!ctx) { 823 put_rpccred(cred); 824 return ERR_PTR(-ENOMEM); 825 } 826 nfs_sb_active(dentry->d_sb); 827 ctx->dentry = dget(dentry); 828 ctx->cred = cred; 829 ctx->state = NULL; 830 ctx->mode = f_mode; 831 ctx->flags = 0; 832 ctx->error = 0; 833 ctx->flock_owner = (fl_owner_t)filp; 834 nfs_init_lock_context(&ctx->lock_context); 835 ctx->lock_context.open_context = ctx; 836 INIT_LIST_HEAD(&ctx->list); 837 ctx->mdsthreshold = NULL; 838 return ctx; 839 } 840 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 841 842 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 843 { 844 if (ctx != NULL) 845 atomic_inc(&ctx->lock_context.count); 846 return ctx; 847 } 848 EXPORT_SYMBOL_GPL(get_nfs_open_context); 849 850 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 851 { 852 struct inode *inode = d_inode(ctx->dentry); 853 struct super_block *sb = ctx->dentry->d_sb; 854 855 if (!list_empty(&ctx->list)) { 856 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 857 return; 858 list_del(&ctx->list); 859 spin_unlock(&inode->i_lock); 860 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 861 return; 862 if (inode != NULL) 863 NFS_PROTO(inode)->close_context(ctx, is_sync); 864 if (ctx->cred != NULL) 865 put_rpccred(ctx->cred); 866 dput(ctx->dentry); 867 nfs_sb_deactive(sb); 868 kfree(ctx->mdsthreshold); 869 kfree(ctx); 870 } 871 872 void put_nfs_open_context(struct nfs_open_context *ctx) 873 { 874 __put_nfs_open_context(ctx, 0); 875 } 876 EXPORT_SYMBOL_GPL(put_nfs_open_context); 877 878 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 879 { 880 __put_nfs_open_context(ctx, 1); 881 } 882 883 /* 884 * Ensure that mmap has a recent RPC credential for use when writing out 885 * shared pages 886 */ 887 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 888 { 889 struct inode *inode = d_inode(ctx->dentry); 890 struct nfs_inode *nfsi = NFS_I(inode); 891 892 spin_lock(&inode->i_lock); 893 if (ctx->mode & FMODE_WRITE) 894 list_add(&ctx->list, &nfsi->open_files); 895 else 896 list_add_tail(&ctx->list, &nfsi->open_files); 897 spin_unlock(&inode->i_lock); 898 } 899 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 900 901 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 902 { 903 filp->private_data = get_nfs_open_context(ctx); 904 if (list_empty(&ctx->list)) 905 nfs_inode_attach_open_context(ctx); 906 } 907 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 908 909 /* 910 * Given an inode, search for an open context with the desired characteristics 911 */ 912 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 913 { 914 struct nfs_inode *nfsi = NFS_I(inode); 915 struct nfs_open_context *pos, *ctx = NULL; 916 917 spin_lock(&inode->i_lock); 918 list_for_each_entry(pos, &nfsi->open_files, list) { 919 if (cred != NULL && pos->cred != cred) 920 continue; 921 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 922 continue; 923 ctx = get_nfs_open_context(pos); 924 break; 925 } 926 spin_unlock(&inode->i_lock); 927 return ctx; 928 } 929 930 void nfs_file_clear_open_context(struct file *filp) 931 { 932 struct nfs_open_context *ctx = nfs_file_open_context(filp); 933 934 if (ctx) { 935 struct inode *inode = d_inode(ctx->dentry); 936 937 /* 938 * We fatal error on write before. Try to writeback 939 * every page again. 940 */ 941 if (ctx->error < 0) 942 invalidate_inode_pages2(inode->i_mapping); 943 filp->private_data = NULL; 944 spin_lock(&inode->i_lock); 945 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 946 spin_unlock(&inode->i_lock); 947 put_nfs_open_context_sync(ctx); 948 } 949 } 950 951 /* 952 * These allocate and release file read/write context information. 953 */ 954 int nfs_open(struct inode *inode, struct file *filp) 955 { 956 struct nfs_open_context *ctx; 957 958 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); 959 if (IS_ERR(ctx)) 960 return PTR_ERR(ctx); 961 nfs_file_set_open_context(filp, ctx); 962 put_nfs_open_context(ctx); 963 nfs_fscache_open_file(inode, filp); 964 return 0; 965 } 966 967 /* 968 * This function is called whenever some part of NFS notices that 969 * the cached attributes have to be refreshed. 970 */ 971 int 972 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 973 { 974 int status = -ESTALE; 975 struct nfs4_label *label = NULL; 976 struct nfs_fattr *fattr = NULL; 977 struct nfs_inode *nfsi = NFS_I(inode); 978 979 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 980 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 981 982 trace_nfs_revalidate_inode_enter(inode); 983 984 if (is_bad_inode(inode)) 985 goto out; 986 if (NFS_STALE(inode)) 987 goto out; 988 989 /* pNFS: Attributes aren't updated until we layoutcommit */ 990 if (S_ISREG(inode->i_mode)) { 991 status = pnfs_sync_inode(inode, false); 992 if (status) 993 goto out; 994 } 995 996 status = -ENOMEM; 997 fattr = nfs_alloc_fattr(); 998 if (fattr == NULL) 999 goto out; 1000 1001 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 1002 1003 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 1004 if (IS_ERR(label)) { 1005 status = PTR_ERR(label); 1006 goto out; 1007 } 1008 1009 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 1010 if (status != 0) { 1011 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 1012 inode->i_sb->s_id, 1013 (unsigned long long)NFS_FILEID(inode), status); 1014 if (status == -ESTALE) { 1015 nfs_zap_caches(inode); 1016 if (!S_ISDIR(inode->i_mode)) 1017 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 1018 } 1019 goto err_out; 1020 } 1021 1022 status = nfs_refresh_inode(inode, fattr); 1023 if (status) { 1024 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 1025 inode->i_sb->s_id, 1026 (unsigned long long)NFS_FILEID(inode), status); 1027 goto err_out; 1028 } 1029 1030 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 1031 nfs_zap_acl_cache(inode); 1032 1033 nfs_setsecurity(inode, fattr, label); 1034 1035 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 1036 inode->i_sb->s_id, 1037 (unsigned long long)NFS_FILEID(inode)); 1038 1039 err_out: 1040 nfs4_label_free(label); 1041 out: 1042 nfs_free_fattr(fattr); 1043 trace_nfs_revalidate_inode_exit(inode, status); 1044 return status; 1045 } 1046 1047 int nfs_attribute_timeout(struct inode *inode) 1048 { 1049 struct nfs_inode *nfsi = NFS_I(inode); 1050 1051 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 1052 } 1053 1054 int nfs_attribute_cache_expired(struct inode *inode) 1055 { 1056 if (nfs_have_delegated_attributes(inode)) 1057 return 0; 1058 return nfs_attribute_timeout(inode); 1059 } 1060 1061 /** 1062 * nfs_revalidate_inode - Revalidate the inode attributes 1063 * @server - pointer to nfs_server struct 1064 * @inode - pointer to inode struct 1065 * 1066 * Updates inode attribute information by retrieving the data from the server. 1067 */ 1068 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1069 { 1070 if (!nfs_need_revalidate_inode(inode)) 1071 return NFS_STALE(inode) ? -ESTALE : 0; 1072 return __nfs_revalidate_inode(server, inode); 1073 } 1074 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1075 1076 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode) 1077 { 1078 if (!(NFS_I(inode)->cache_validity & 1079 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 1080 && !nfs_attribute_cache_expired(inode)) 1081 return NFS_STALE(inode) ? -ESTALE : 0; 1082 return -ECHILD; 1083 } 1084 1085 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1086 { 1087 struct nfs_inode *nfsi = NFS_I(inode); 1088 int ret; 1089 1090 if (mapping->nrpages != 0) { 1091 if (S_ISREG(inode->i_mode)) { 1092 unmap_mapping_range(mapping, 0, 0, 0); 1093 ret = nfs_sync_mapping(mapping); 1094 if (ret < 0) 1095 return ret; 1096 } 1097 ret = invalidate_inode_pages2(mapping); 1098 if (ret < 0) 1099 return ret; 1100 } 1101 if (S_ISDIR(inode->i_mode)) { 1102 spin_lock(&inode->i_lock); 1103 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1104 spin_unlock(&inode->i_lock); 1105 } 1106 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1107 nfs_fscache_wait_on_invalidate(inode); 1108 1109 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1110 inode->i_sb->s_id, 1111 (unsigned long long)NFS_FILEID(inode)); 1112 return 0; 1113 } 1114 1115 bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1116 { 1117 unsigned long cache_validity = NFS_I(inode)->cache_validity; 1118 1119 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) { 1120 const unsigned long force_reval = 1121 NFS_INO_REVAL_PAGECACHE|NFS_INO_REVAL_FORCED; 1122 return (cache_validity & force_reval) == force_reval; 1123 } 1124 1125 return (cache_validity & NFS_INO_REVAL_PAGECACHE) 1126 || nfs_attribute_timeout(inode) 1127 || NFS_STALE(inode); 1128 } 1129 1130 int nfs_revalidate_mapping_rcu(struct inode *inode) 1131 { 1132 struct nfs_inode *nfsi = NFS_I(inode); 1133 unsigned long *bitlock = &nfsi->flags; 1134 int ret = 0; 1135 1136 if (IS_SWAPFILE(inode)) 1137 goto out; 1138 if (nfs_mapping_need_revalidate_inode(inode)) { 1139 ret = -ECHILD; 1140 goto out; 1141 } 1142 spin_lock(&inode->i_lock); 1143 if (test_bit(NFS_INO_INVALIDATING, bitlock) || 1144 (nfsi->cache_validity & NFS_INO_INVALID_DATA)) 1145 ret = -ECHILD; 1146 spin_unlock(&inode->i_lock); 1147 out: 1148 return ret; 1149 } 1150 1151 /** 1152 * nfs_revalidate_mapping - Revalidate the pagecache 1153 * @inode - pointer to host inode 1154 * @mapping - pointer to mapping 1155 */ 1156 int nfs_revalidate_mapping(struct inode *inode, 1157 struct address_space *mapping) 1158 { 1159 struct nfs_inode *nfsi = NFS_I(inode); 1160 unsigned long *bitlock = &nfsi->flags; 1161 int ret = 0; 1162 1163 /* swapfiles are not supposed to be shared. */ 1164 if (IS_SWAPFILE(inode)) 1165 goto out; 1166 1167 if (nfs_mapping_need_revalidate_inode(inode)) { 1168 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1169 if (ret < 0) 1170 goto out; 1171 } 1172 1173 /* 1174 * We must clear NFS_INO_INVALID_DATA first to ensure that 1175 * invalidations that come in while we're shooting down the mappings 1176 * are respected. But, that leaves a race window where one revalidator 1177 * can clear the flag, and then another checks it before the mapping 1178 * gets invalidated. Fix that by serializing access to this part of 1179 * the function. 1180 * 1181 * At the same time, we need to allow other tasks to see whether we 1182 * might be in the middle of invalidating the pages, so we only set 1183 * the bit lock here if it looks like we're going to be doing that. 1184 */ 1185 for (;;) { 1186 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1187 nfs_wait_bit_killable, TASK_KILLABLE); 1188 if (ret) 1189 goto out; 1190 spin_lock(&inode->i_lock); 1191 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1192 spin_unlock(&inode->i_lock); 1193 continue; 1194 } 1195 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1196 break; 1197 spin_unlock(&inode->i_lock); 1198 goto out; 1199 } 1200 1201 set_bit(NFS_INO_INVALIDATING, bitlock); 1202 smp_wmb(); 1203 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1204 spin_unlock(&inode->i_lock); 1205 trace_nfs_invalidate_mapping_enter(inode); 1206 ret = nfs_invalidate_mapping(inode, mapping); 1207 trace_nfs_invalidate_mapping_exit(inode, ret); 1208 1209 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1210 smp_mb__after_atomic(); 1211 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1212 out: 1213 return ret; 1214 } 1215 1216 static bool nfs_file_has_writers(struct nfs_inode *nfsi) 1217 { 1218 struct inode *inode = &nfsi->vfs_inode; 1219 1220 assert_spin_locked(&inode->i_lock); 1221 1222 if (!S_ISREG(inode->i_mode)) 1223 return false; 1224 if (list_empty(&nfsi->open_files)) 1225 return false; 1226 /* Note: This relies on nfsi->open_files being ordered with writers 1227 * being placed at the head of the list. 1228 * See nfs_inode_attach_open_context() 1229 */ 1230 return (list_first_entry(&nfsi->open_files, 1231 struct nfs_open_context, 1232 list)->mode & FMODE_WRITE) == FMODE_WRITE; 1233 } 1234 1235 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) 1236 { 1237 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); 1238 } 1239 1240 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1241 { 1242 struct nfs_inode *nfsi = NFS_I(inode); 1243 unsigned long ret = 0; 1244 1245 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1246 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1247 && inode->i_version == fattr->pre_change_attr) { 1248 inode->i_version = fattr->change_attr; 1249 if (S_ISDIR(inode->i_mode)) 1250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1251 ret |= NFS_INO_INVALID_ATTR; 1252 } 1253 /* If we have atomic WCC data, we may update some attributes */ 1254 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1255 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1256 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1257 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1258 ret |= NFS_INO_INVALID_ATTR; 1259 } 1260 1261 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1262 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1263 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1264 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1265 if (S_ISDIR(inode->i_mode)) 1266 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1267 ret |= NFS_INO_INVALID_ATTR; 1268 } 1269 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1270 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1271 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1272 && nfsi->nrequests == 0) { 1273 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1274 ret |= NFS_INO_INVALID_ATTR; 1275 } 1276 1277 return ret; 1278 } 1279 1280 /** 1281 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1282 * @inode - pointer to inode 1283 * @fattr - updated attributes 1284 * 1285 * Verifies the attribute cache. If we have just changed the attributes, 1286 * so that fattr carries weak cache consistency data, then it may 1287 * also update the ctime/mtime/change_attribute. 1288 */ 1289 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1290 { 1291 struct nfs_inode *nfsi = NFS_I(inode); 1292 loff_t cur_size, new_isize; 1293 unsigned long invalid = 0; 1294 1295 1296 if (nfs_have_delegated_attributes(inode)) 1297 return 0; 1298 /* Has the inode gone and changed behind our back? */ 1299 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1300 return -EIO; 1301 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1302 return -EIO; 1303 1304 if (!nfs_file_has_buffered_writers(nfsi)) { 1305 /* Verify a few of the more important attributes */ 1306 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr) 1307 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE; 1308 1309 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1310 invalid |= NFS_INO_INVALID_ATTR; 1311 1312 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime)) 1313 invalid |= NFS_INO_INVALID_ATTR; 1314 1315 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1316 cur_size = i_size_read(inode); 1317 new_isize = nfs_size_to_loff_t(fattr->size); 1318 if (cur_size != new_isize) 1319 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1320 } 1321 } 1322 1323 /* Have any file permissions changed? */ 1324 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1325 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1326 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1327 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1328 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1329 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1330 1331 /* Has the link count changed? */ 1332 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1333 invalid |= NFS_INO_INVALID_ATTR; 1334 1335 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1336 invalid |= NFS_INO_INVALID_ATIME; 1337 1338 if (invalid != 0) 1339 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED); 1340 1341 nfsi->read_cache_jiffies = fattr->time_start; 1342 return 0; 1343 } 1344 1345 static atomic_long_t nfs_attr_generation_counter; 1346 1347 static unsigned long nfs_read_attr_generation_counter(void) 1348 { 1349 return atomic_long_read(&nfs_attr_generation_counter); 1350 } 1351 1352 unsigned long nfs_inc_attr_generation_counter(void) 1353 { 1354 return atomic_long_inc_return(&nfs_attr_generation_counter); 1355 } 1356 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1357 1358 void nfs_fattr_init(struct nfs_fattr *fattr) 1359 { 1360 fattr->valid = 0; 1361 fattr->time_start = jiffies; 1362 fattr->gencount = nfs_inc_attr_generation_counter(); 1363 fattr->owner_name = NULL; 1364 fattr->group_name = NULL; 1365 } 1366 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1367 1368 /** 1369 * nfs_fattr_set_barrier 1370 * @fattr: attributes 1371 * 1372 * Used to set a barrier after an attribute was updated. This 1373 * barrier ensures that older attributes from RPC calls that may 1374 * have raced with our update cannot clobber these new values. 1375 * Note that you are still responsible for ensuring that other 1376 * operations which change the attribute on the server do not 1377 * collide. 1378 */ 1379 void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1380 { 1381 fattr->gencount = nfs_inc_attr_generation_counter(); 1382 } 1383 1384 struct nfs_fattr *nfs_alloc_fattr(void) 1385 { 1386 struct nfs_fattr *fattr; 1387 1388 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1389 if (fattr != NULL) 1390 nfs_fattr_init(fattr); 1391 return fattr; 1392 } 1393 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1394 1395 struct nfs_fh *nfs_alloc_fhandle(void) 1396 { 1397 struct nfs_fh *fh; 1398 1399 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1400 if (fh != NULL) 1401 fh->size = 0; 1402 return fh; 1403 } 1404 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1405 1406 #ifdef NFS_DEBUG 1407 /* 1408 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1409 * in the same way that wireshark does 1410 * 1411 * @fh: file handle 1412 * 1413 * For debugging only. 1414 */ 1415 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1416 { 1417 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1418 * not on the result */ 1419 return nfs_fhandle_hash(fh); 1420 } 1421 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1422 1423 /* 1424 * _nfs_display_fhandle - display an NFS file handle on the console 1425 * 1426 * @fh: file handle to display 1427 * @caption: display caption 1428 * 1429 * For debugging only. 1430 */ 1431 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1432 { 1433 unsigned short i; 1434 1435 if (fh == NULL || fh->size == 0) { 1436 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1437 return; 1438 } 1439 1440 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1441 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1442 for (i = 0; i < fh->size; i += 16) { 1443 __be32 *pos = (__be32 *)&fh->data[i]; 1444 1445 switch ((fh->size - i - 1) >> 2) { 1446 case 0: 1447 printk(KERN_DEFAULT " %08x\n", 1448 be32_to_cpup(pos)); 1449 break; 1450 case 1: 1451 printk(KERN_DEFAULT " %08x %08x\n", 1452 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1453 break; 1454 case 2: 1455 printk(KERN_DEFAULT " %08x %08x %08x\n", 1456 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1457 be32_to_cpup(pos + 2)); 1458 break; 1459 default: 1460 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1461 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1462 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1463 } 1464 } 1465 } 1466 EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1467 #endif 1468 1469 /** 1470 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1471 * @inode - pointer to inode 1472 * @fattr - attributes 1473 * 1474 * Attempt to divine whether or not an RPC call reply carrying stale 1475 * attributes got scheduled after another call carrying updated ones. 1476 * 1477 * To do so, the function first assumes that a more recent ctime means 1478 * that the attributes in fattr are newer, however it also attempt to 1479 * catch the case where ctime either didn't change, or went backwards 1480 * (if someone reset the clock on the server) by looking at whether 1481 * or not this RPC call was started after the inode was last updated. 1482 * Note also the check for wraparound of 'attr_gencount' 1483 * 1484 * The function returns 'true' if it thinks the attributes in 'fattr' are 1485 * more recent than the ones cached in the inode. 1486 * 1487 */ 1488 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1489 { 1490 const struct nfs_inode *nfsi = NFS_I(inode); 1491 1492 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1493 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1494 } 1495 1496 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1497 { 1498 int ret; 1499 1500 trace_nfs_refresh_inode_enter(inode); 1501 1502 if (nfs_inode_attrs_need_update(inode, fattr)) 1503 ret = nfs_update_inode(inode, fattr); 1504 else 1505 ret = nfs_check_inode_attributes(inode, fattr); 1506 1507 trace_nfs_refresh_inode_exit(inode, ret); 1508 return ret; 1509 } 1510 1511 /** 1512 * nfs_refresh_inode - try to update the inode attribute cache 1513 * @inode - pointer to inode 1514 * @fattr - updated attributes 1515 * 1516 * Check that an RPC call that returned attributes has not overlapped with 1517 * other recent updates of the inode metadata, then decide whether it is 1518 * safe to do a full update of the inode attributes, or whether just to 1519 * call nfs_check_inode_attributes. 1520 */ 1521 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1522 { 1523 int status; 1524 1525 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1526 return 0; 1527 spin_lock(&inode->i_lock); 1528 status = nfs_refresh_inode_locked(inode, fattr); 1529 spin_unlock(&inode->i_lock); 1530 1531 return status; 1532 } 1533 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1534 1535 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1536 { 1537 unsigned long invalid = NFS_INO_INVALID_ATTR; 1538 1539 /* 1540 * Don't revalidate the pagecache if we hold a delegation, but do 1541 * force an attribute update 1542 */ 1543 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1544 invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED; 1545 1546 if (S_ISDIR(inode->i_mode)) 1547 invalid |= NFS_INO_INVALID_DATA; 1548 nfs_set_cache_invalid(inode, invalid); 1549 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1550 return 0; 1551 return nfs_refresh_inode_locked(inode, fattr); 1552 } 1553 1554 /** 1555 * nfs_post_op_update_inode - try to update the inode attribute cache 1556 * @inode - pointer to inode 1557 * @fattr - updated attributes 1558 * 1559 * After an operation that has changed the inode metadata, mark the 1560 * attribute cache as being invalid, then try to update it. 1561 * 1562 * NB: if the server didn't return any post op attributes, this 1563 * function will force the retrieval of attributes before the next 1564 * NFS request. Thus it should be used only for operations that 1565 * are expected to change one or more attributes, to avoid 1566 * unnecessary NFS requests and trips through nfs_update_inode(). 1567 */ 1568 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1569 { 1570 int status; 1571 1572 spin_lock(&inode->i_lock); 1573 nfs_fattr_set_barrier(fattr); 1574 status = nfs_post_op_update_inode_locked(inode, fattr); 1575 spin_unlock(&inode->i_lock); 1576 1577 return status; 1578 } 1579 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1580 1581 /** 1582 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1583 * @inode - pointer to inode 1584 * @fattr - updated attributes 1585 * 1586 * After an operation that has changed the inode metadata, mark the 1587 * attribute cache as being invalid, then try to update it. Fake up 1588 * weak cache consistency data, if none exist. 1589 * 1590 * This function is mainly designed to be used by the ->write_done() functions. 1591 */ 1592 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1593 { 1594 int status; 1595 1596 /* Don't do a WCC update if these attributes are already stale */ 1597 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1598 !nfs_inode_attrs_need_update(inode, fattr)) { 1599 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1600 | NFS_ATTR_FATTR_PRESIZE 1601 | NFS_ATTR_FATTR_PREMTIME 1602 | NFS_ATTR_FATTR_PRECTIME); 1603 goto out_noforce; 1604 } 1605 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1606 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1607 fattr->pre_change_attr = inode->i_version; 1608 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1609 } 1610 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1611 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1612 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1613 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1614 } 1615 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1616 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1617 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1618 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1619 } 1620 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1621 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1622 fattr->pre_size = i_size_read(inode); 1623 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1624 } 1625 out_noforce: 1626 status = nfs_post_op_update_inode_locked(inode, fattr); 1627 return status; 1628 } 1629 1630 /** 1631 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1632 * @inode - pointer to inode 1633 * @fattr - updated attributes 1634 * 1635 * After an operation that has changed the inode metadata, mark the 1636 * attribute cache as being invalid, then try to update it. Fake up 1637 * weak cache consistency data, if none exist. 1638 * 1639 * This function is mainly designed to be used by the ->write_done() functions. 1640 */ 1641 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1642 { 1643 int status; 1644 1645 spin_lock(&inode->i_lock); 1646 nfs_fattr_set_barrier(fattr); 1647 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1648 spin_unlock(&inode->i_lock); 1649 return status; 1650 } 1651 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1652 1653 1654 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1655 struct nfs_fattr *fattr) 1656 { 1657 bool ret1 = true, ret2 = true; 1658 1659 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1660 ret1 = (nfsi->fileid == fattr->fileid); 1661 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1662 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1663 return ret1 || ret2; 1664 } 1665 1666 /* 1667 * Many nfs protocol calls return the new file attributes after 1668 * an operation. Here we update the inode to reflect the state 1669 * of the server's inode. 1670 * 1671 * This is a bit tricky because we have to make sure all dirty pages 1672 * have been sent off to the server before calling invalidate_inode_pages. 1673 * To make sure no other process adds more write requests while we try 1674 * our best to flush them, we make them sleep during the attribute refresh. 1675 * 1676 * A very similar scenario holds for the dir cache. 1677 */ 1678 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1679 { 1680 struct nfs_server *server; 1681 struct nfs_inode *nfsi = NFS_I(inode); 1682 loff_t cur_isize, new_isize; 1683 unsigned long invalid = 0; 1684 unsigned long now = jiffies; 1685 unsigned long save_cache_validity; 1686 bool have_writers = nfs_file_has_buffered_writers(nfsi); 1687 bool cache_revalidated = true; 1688 1689 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1690 __func__, inode->i_sb->s_id, inode->i_ino, 1691 nfs_display_fhandle_hash(NFS_FH(inode)), 1692 atomic_read(&inode->i_count), fattr->valid); 1693 1694 if (!nfs_fileid_valid(nfsi, fattr)) { 1695 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1696 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1697 NFS_SERVER(inode)->nfs_client->cl_hostname, 1698 inode->i_sb->s_id, (long long)nfsi->fileid, 1699 (long long)fattr->fileid); 1700 goto out_err; 1701 } 1702 1703 /* 1704 * Make sure the inode's type hasn't changed. 1705 */ 1706 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1707 /* 1708 * Big trouble! The inode has become a different object. 1709 */ 1710 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1711 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1712 goto out_err; 1713 } 1714 1715 server = NFS_SERVER(inode); 1716 /* Update the fsid? */ 1717 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1718 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1719 !IS_AUTOMOUNT(inode)) 1720 server->fsid = fattr->fsid; 1721 1722 /* 1723 * Update the read time so we don't revalidate too often. 1724 */ 1725 nfsi->read_cache_jiffies = fattr->time_start; 1726 1727 save_cache_validity = nfsi->cache_validity; 1728 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1729 | NFS_INO_INVALID_ATIME 1730 | NFS_INO_REVAL_FORCED 1731 | NFS_INO_REVAL_PAGECACHE); 1732 1733 /* Do atomic weak cache consistency updates */ 1734 invalid |= nfs_wcc_update_inode(inode, fattr); 1735 1736 if (pnfs_layoutcommit_outstanding(inode)) { 1737 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR; 1738 cache_revalidated = false; 1739 } 1740 1741 /* More cache consistency checks */ 1742 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1743 if (inode->i_version != fattr->change_attr) { 1744 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1745 inode->i_sb->s_id, inode->i_ino); 1746 /* Could it be a race with writeback? */ 1747 if (!have_writers) { 1748 invalid |= NFS_INO_INVALID_ATTR 1749 | NFS_INO_INVALID_DATA 1750 | NFS_INO_INVALID_ACCESS 1751 | NFS_INO_INVALID_ACL; 1752 if (S_ISDIR(inode->i_mode)) 1753 nfs_force_lookup_revalidate(inode); 1754 } 1755 inode->i_version = fattr->change_attr; 1756 } 1757 } else { 1758 nfsi->cache_validity |= save_cache_validity; 1759 cache_revalidated = false; 1760 } 1761 1762 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1763 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1764 } else if (server->caps & NFS_CAP_MTIME) { 1765 nfsi->cache_validity |= save_cache_validity & 1766 (NFS_INO_INVALID_ATTR 1767 | NFS_INO_REVAL_FORCED); 1768 cache_revalidated = false; 1769 } 1770 1771 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1772 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1773 } else if (server->caps & NFS_CAP_CTIME) { 1774 nfsi->cache_validity |= save_cache_validity & 1775 (NFS_INO_INVALID_ATTR 1776 | NFS_INO_REVAL_FORCED); 1777 cache_revalidated = false; 1778 } 1779 1780 /* Check if our cached file size is stale */ 1781 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1782 new_isize = nfs_size_to_loff_t(fattr->size); 1783 cur_isize = i_size_read(inode); 1784 if (new_isize != cur_isize) { 1785 /* Do we perhaps have any outstanding writes, or has 1786 * the file grown beyond our last write? */ 1787 if (nfsi->nrequests == 0 || new_isize > cur_isize) { 1788 i_size_write(inode, new_isize); 1789 if (!have_writers) 1790 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1791 } 1792 dprintk("NFS: isize change on server for file %s/%ld " 1793 "(%Ld to %Ld)\n", 1794 inode->i_sb->s_id, 1795 inode->i_ino, 1796 (long long)cur_isize, 1797 (long long)new_isize); 1798 } 1799 } else { 1800 nfsi->cache_validity |= save_cache_validity & 1801 (NFS_INO_INVALID_ATTR 1802 | NFS_INO_REVAL_PAGECACHE 1803 | NFS_INO_REVAL_FORCED); 1804 cache_revalidated = false; 1805 } 1806 1807 1808 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1809 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1810 else if (server->caps & NFS_CAP_ATIME) { 1811 nfsi->cache_validity |= save_cache_validity & 1812 (NFS_INO_INVALID_ATIME 1813 | NFS_INO_REVAL_FORCED); 1814 cache_revalidated = false; 1815 } 1816 1817 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1818 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1819 umode_t newmode = inode->i_mode & S_IFMT; 1820 newmode |= fattr->mode & S_IALLUGO; 1821 inode->i_mode = newmode; 1822 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1823 } 1824 } else if (server->caps & NFS_CAP_MODE) { 1825 nfsi->cache_validity |= save_cache_validity & 1826 (NFS_INO_INVALID_ATTR 1827 | NFS_INO_INVALID_ACCESS 1828 | NFS_INO_INVALID_ACL 1829 | NFS_INO_REVAL_FORCED); 1830 cache_revalidated = false; 1831 } 1832 1833 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1834 if (!uid_eq(inode->i_uid, fattr->uid)) { 1835 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1836 inode->i_uid = fattr->uid; 1837 } 1838 } else if (server->caps & NFS_CAP_OWNER) { 1839 nfsi->cache_validity |= save_cache_validity & 1840 (NFS_INO_INVALID_ATTR 1841 | NFS_INO_INVALID_ACCESS 1842 | NFS_INO_INVALID_ACL 1843 | NFS_INO_REVAL_FORCED); 1844 cache_revalidated = false; 1845 } 1846 1847 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1848 if (!gid_eq(inode->i_gid, fattr->gid)) { 1849 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1850 inode->i_gid = fattr->gid; 1851 } 1852 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1853 nfsi->cache_validity |= save_cache_validity & 1854 (NFS_INO_INVALID_ATTR 1855 | NFS_INO_INVALID_ACCESS 1856 | NFS_INO_INVALID_ACL 1857 | NFS_INO_REVAL_FORCED); 1858 cache_revalidated = false; 1859 } 1860 1861 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1862 if (inode->i_nlink != fattr->nlink) { 1863 invalid |= NFS_INO_INVALID_ATTR; 1864 if (S_ISDIR(inode->i_mode)) 1865 invalid |= NFS_INO_INVALID_DATA; 1866 set_nlink(inode, fattr->nlink); 1867 } 1868 } else if (server->caps & NFS_CAP_NLINK) { 1869 nfsi->cache_validity |= save_cache_validity & 1870 (NFS_INO_INVALID_ATTR 1871 | NFS_INO_REVAL_FORCED); 1872 cache_revalidated = false; 1873 } 1874 1875 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1876 /* 1877 * report the blocks in 512byte units 1878 */ 1879 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1880 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1881 inode->i_blocks = fattr->du.nfs2.blocks; 1882 else 1883 cache_revalidated = false; 1884 1885 /* Update attrtimeo value if we're out of the unstable period */ 1886 if (invalid & NFS_INO_INVALID_ATTR) { 1887 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1888 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1889 nfsi->attrtimeo_timestamp = now; 1890 /* Set barrier to be more recent than all outstanding updates */ 1891 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1892 } else { 1893 if (cache_revalidated) { 1894 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 1895 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1896 nfsi->attrtimeo <<= 1; 1897 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 1898 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1899 } 1900 nfsi->attrtimeo_timestamp = now; 1901 } 1902 /* Set the barrier to be more recent than this fattr */ 1903 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 1904 nfsi->attr_gencount = fattr->gencount; 1905 } 1906 1907 /* Don't declare attrcache up to date if there were no attrs! */ 1908 if (cache_revalidated) 1909 invalid &= ~NFS_INO_INVALID_ATTR; 1910 1911 /* Don't invalidate the data if we were to blame */ 1912 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1913 || S_ISLNK(inode->i_mode))) 1914 invalid &= ~NFS_INO_INVALID_DATA; 1915 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1916 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1917 nfs_set_cache_invalid(inode, invalid); 1918 1919 return 0; 1920 out_err: 1921 /* 1922 * No need to worry about unhashing the dentry, as the 1923 * lookup validation will know that the inode is bad. 1924 * (But we fall through to invalidate the caches.) 1925 */ 1926 nfs_invalidate_inode(inode); 1927 return -ESTALE; 1928 } 1929 1930 struct inode *nfs_alloc_inode(struct super_block *sb) 1931 { 1932 struct nfs_inode *nfsi; 1933 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1934 if (!nfsi) 1935 return NULL; 1936 nfsi->flags = 0UL; 1937 nfsi->cache_validity = 0UL; 1938 #if IS_ENABLED(CONFIG_NFS_V4) 1939 nfsi->nfs4_acl = NULL; 1940 #endif /* CONFIG_NFS_V4 */ 1941 return &nfsi->vfs_inode; 1942 } 1943 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1944 1945 static void nfs_i_callback(struct rcu_head *head) 1946 { 1947 struct inode *inode = container_of(head, struct inode, i_rcu); 1948 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1949 } 1950 1951 void nfs_destroy_inode(struct inode *inode) 1952 { 1953 call_rcu(&inode->i_rcu, nfs_i_callback); 1954 } 1955 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1956 1957 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1958 { 1959 #if IS_ENABLED(CONFIG_NFS_V4) 1960 INIT_LIST_HEAD(&nfsi->open_states); 1961 nfsi->delegation = NULL; 1962 init_rwsem(&nfsi->rwsem); 1963 nfsi->layout = NULL; 1964 #endif 1965 } 1966 1967 static void init_once(void *foo) 1968 { 1969 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1970 1971 inode_init_once(&nfsi->vfs_inode); 1972 INIT_LIST_HEAD(&nfsi->open_files); 1973 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1974 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1975 INIT_LIST_HEAD(&nfsi->commit_info.list); 1976 nfsi->nrequests = 0; 1977 nfsi->commit_info.ncommit = 0; 1978 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1979 init_rwsem(&nfsi->rmdir_sem); 1980 nfs4_init_once(nfsi); 1981 } 1982 1983 static int __init nfs_init_inodecache(void) 1984 { 1985 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1986 sizeof(struct nfs_inode), 1987 0, (SLAB_RECLAIM_ACCOUNT| 1988 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 1989 init_once); 1990 if (nfs_inode_cachep == NULL) 1991 return -ENOMEM; 1992 1993 return 0; 1994 } 1995 1996 static void nfs_destroy_inodecache(void) 1997 { 1998 /* 1999 * Make sure all delayed rcu free inodes are flushed before we 2000 * destroy cache. 2001 */ 2002 rcu_barrier(); 2003 kmem_cache_destroy(nfs_inode_cachep); 2004 } 2005 2006 struct workqueue_struct *nfsiod_workqueue; 2007 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 2008 2009 /* 2010 * start up the nfsiod workqueue 2011 */ 2012 static int nfsiod_start(void) 2013 { 2014 struct workqueue_struct *wq; 2015 dprintk("RPC: creating workqueue nfsiod\n"); 2016 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 2017 if (wq == NULL) 2018 return -ENOMEM; 2019 nfsiod_workqueue = wq; 2020 return 0; 2021 } 2022 2023 /* 2024 * Destroy the nfsiod workqueue 2025 */ 2026 static void nfsiod_stop(void) 2027 { 2028 struct workqueue_struct *wq; 2029 2030 wq = nfsiod_workqueue; 2031 if (wq == NULL) 2032 return; 2033 nfsiod_workqueue = NULL; 2034 destroy_workqueue(wq); 2035 } 2036 2037 unsigned int nfs_net_id; 2038 EXPORT_SYMBOL_GPL(nfs_net_id); 2039 2040 static int nfs_net_init(struct net *net) 2041 { 2042 nfs_clients_init(net); 2043 return nfs_fs_proc_net_init(net); 2044 } 2045 2046 static void nfs_net_exit(struct net *net) 2047 { 2048 nfs_fs_proc_net_exit(net); 2049 nfs_cleanup_cb_ident_idr(net); 2050 } 2051 2052 static struct pernet_operations nfs_net_ops = { 2053 .init = nfs_net_init, 2054 .exit = nfs_net_exit, 2055 .id = &nfs_net_id, 2056 .size = sizeof(struct nfs_net), 2057 }; 2058 2059 /* 2060 * Initialize NFS 2061 */ 2062 static int __init init_nfs_fs(void) 2063 { 2064 int err; 2065 2066 err = register_pernet_subsys(&nfs_net_ops); 2067 if (err < 0) 2068 goto out9; 2069 2070 err = nfs_fscache_register(); 2071 if (err < 0) 2072 goto out8; 2073 2074 err = nfsiod_start(); 2075 if (err) 2076 goto out7; 2077 2078 err = nfs_fs_proc_init(); 2079 if (err) 2080 goto out6; 2081 2082 err = nfs_init_nfspagecache(); 2083 if (err) 2084 goto out5; 2085 2086 err = nfs_init_inodecache(); 2087 if (err) 2088 goto out4; 2089 2090 err = nfs_init_readpagecache(); 2091 if (err) 2092 goto out3; 2093 2094 err = nfs_init_writepagecache(); 2095 if (err) 2096 goto out2; 2097 2098 err = nfs_init_directcache(); 2099 if (err) 2100 goto out1; 2101 2102 rpc_proc_register(&init_net, &nfs_rpcstat); 2103 2104 err = register_nfs_fs(); 2105 if (err) 2106 goto out0; 2107 2108 return 0; 2109 out0: 2110 rpc_proc_unregister(&init_net, "nfs"); 2111 nfs_destroy_directcache(); 2112 out1: 2113 nfs_destroy_writepagecache(); 2114 out2: 2115 nfs_destroy_readpagecache(); 2116 out3: 2117 nfs_destroy_inodecache(); 2118 out4: 2119 nfs_destroy_nfspagecache(); 2120 out5: 2121 nfs_fs_proc_exit(); 2122 out6: 2123 nfsiod_stop(); 2124 out7: 2125 nfs_fscache_unregister(); 2126 out8: 2127 unregister_pernet_subsys(&nfs_net_ops); 2128 out9: 2129 return err; 2130 } 2131 2132 static void __exit exit_nfs_fs(void) 2133 { 2134 nfs_destroy_directcache(); 2135 nfs_destroy_writepagecache(); 2136 nfs_destroy_readpagecache(); 2137 nfs_destroy_inodecache(); 2138 nfs_destroy_nfspagecache(); 2139 nfs_fscache_unregister(); 2140 unregister_pernet_subsys(&nfs_net_ops); 2141 rpc_proc_unregister(&init_net, "nfs"); 2142 unregister_nfs_fs(); 2143 nfs_fs_proc_exit(); 2144 nfsiod_stop(); 2145 } 2146 2147 /* Not quite true; I just maintain it */ 2148 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2149 MODULE_LICENSE("GPL"); 2150 module_param(enable_ino64, bool, 0644); 2151 2152 module_init(init_nfs_fs) 2153 module_exit(exit_nfs_fs) 2154