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 */ 61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 62 63static void nfs_invalidate_inode(struct inode *); 64static int nfs_update_inode(struct inode *, struct nfs_fattr *); 65 66static struct kmem_cache * nfs_inode_cachep; 67 68static inline unsigned long 69nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 70{ 71 return nfs_fileid_to_ino_t(fattr->fileid); 72} 73 74/** 75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks 76 * @word: long word containing the bit lock 77 */ 78int nfs_wait_bit_killable(struct wait_bit_key *key) 79{ 80 if (fatal_signal_pending(current)) 81 return -ERESTARTSYS; 82 freezable_schedule_unsafe(); 83 return 0; 84} 85EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 86 87/** 88 * nfs_compat_user_ino64 - returns the user-visible inode number 89 * @fileid: 64-bit fileid 90 * 91 * This function returns a 32-bit inode number if the boot parameter 92 * nfs.enable_ino64 is zero. 93 */ 94u64 nfs_compat_user_ino64(u64 fileid) 95{ 96#ifdef CONFIG_COMPAT 97 compat_ulong_t ino; 98#else 99 unsigned long ino; 100#endif 101 102 if (enable_ino64) 103 return fileid; 104 ino = fileid; 105 if (sizeof(ino) < sizeof(fileid)) 106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 107 return ino; 108} 109 110int nfs_drop_inode(struct inode *inode) 111{ 112 return NFS_STALE(inode) || generic_drop_inode(inode); 113} 114EXPORT_SYMBOL_GPL(nfs_drop_inode); 115 116void nfs_clear_inode(struct inode *inode) 117{ 118 /* 119 * The following should never happen... 120 */ 121 WARN_ON_ONCE(nfs_have_writebacks(inode)); 122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 123 nfs_zap_acl_cache(inode); 124 nfs_access_zap_cache(inode); 125 nfs_fscache_clear_inode(inode); 126} 127EXPORT_SYMBOL_GPL(nfs_clear_inode); 128 129void nfs_evict_inode(struct inode *inode) 130{ 131 truncate_inode_pages_final(&inode->i_data); 132 clear_inode(inode); 133 nfs_clear_inode(inode); 134} 135 136int nfs_sync_inode(struct inode *inode) 137{ 138 nfs_inode_dio_wait(inode); 139 return nfs_wb_all(inode); 140} 141EXPORT_SYMBOL_GPL(nfs_sync_inode); 142 143/** 144 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 145 */ 146int nfs_sync_mapping(struct address_space *mapping) 147{ 148 int ret = 0; 149 150 if (mapping->nrpages != 0) { 151 unmap_mapping_range(mapping, 0, 0, 0); 152 ret = nfs_wb_all(mapping->host); 153 } 154 return ret; 155} 156 157static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) 158{ 159 struct nfs_inode *nfsi = NFS_I(inode); 160 161 if (inode->i_mapping->nrpages == 0) 162 flags &= ~NFS_INO_INVALID_DATA; 163 nfsi->cache_validity |= flags; 164 if (flags & NFS_INO_INVALID_DATA) 165 nfs_fscache_invalidate(inode); 166} 167 168/* 169 * Invalidate the local caches 170 */ 171static void nfs_zap_caches_locked(struct inode *inode) 172{ 173 struct nfs_inode *nfsi = NFS_I(inode); 174 int mode = inode->i_mode; 175 176 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 177 178 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 179 nfsi->attrtimeo_timestamp = jiffies; 180 181 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); 182 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 183 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 184 | NFS_INO_INVALID_DATA 185 | NFS_INO_INVALID_ACCESS 186 | NFS_INO_INVALID_ACL 187 | NFS_INO_REVAL_PAGECACHE); 188 } else 189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 190 | NFS_INO_INVALID_ACCESS 191 | NFS_INO_INVALID_ACL 192 | NFS_INO_REVAL_PAGECACHE); 193 nfs_zap_label_cache_locked(nfsi); 194} 195 196void nfs_zap_caches(struct inode *inode) 197{ 198 spin_lock(&inode->i_lock); 199 nfs_zap_caches_locked(inode); 200 spin_unlock(&inode->i_lock); 201} 202 203void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 204{ 205 if (mapping->nrpages != 0) { 206 spin_lock(&inode->i_lock); 207 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 208 spin_unlock(&inode->i_lock); 209 } 210} 211 212void nfs_zap_acl_cache(struct inode *inode) 213{ 214 void (*clear_acl_cache)(struct inode *); 215 216 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 217 if (clear_acl_cache != NULL) 218 clear_acl_cache(inode); 219 spin_lock(&inode->i_lock); 220 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 221 spin_unlock(&inode->i_lock); 222} 223EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 224 225void nfs_invalidate_atime(struct inode *inode) 226{ 227 spin_lock(&inode->i_lock); 228 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); 229 spin_unlock(&inode->i_lock); 230} 231EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 232 233/* 234 * Invalidate, but do not unhash, the inode. 235 * NB: must be called with inode->i_lock held! 236 */ 237static void nfs_invalidate_inode(struct inode *inode) 238{ 239 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 240 nfs_zap_caches_locked(inode); 241} 242 243struct nfs_find_desc { 244 struct nfs_fh *fh; 245 struct nfs_fattr *fattr; 246}; 247 248/* 249 * In NFSv3 we can have 64bit inode numbers. In order to support 250 * this, and re-exported directories (also seen in NFSv2) 251 * we are forced to allow 2 different inodes to have the same 252 * i_ino. 253 */ 254static int 255nfs_find_actor(struct inode *inode, void *opaque) 256{ 257 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 258 struct nfs_fh *fh = desc->fh; 259 struct nfs_fattr *fattr = desc->fattr; 260 261 if (NFS_FILEID(inode) != fattr->fileid) 262 return 0; 263 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 264 return 0; 265 if (nfs_compare_fh(NFS_FH(inode), fh)) 266 return 0; 267 if (is_bad_inode(inode) || NFS_STALE(inode)) 268 return 0; 269 return 1; 270} 271 272static int 273nfs_init_locked(struct inode *inode, void *opaque) 274{ 275 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 276 struct nfs_fattr *fattr = desc->fattr; 277 278 set_nfs_fileid(inode, fattr->fileid); 279 nfs_copy_fh(NFS_FH(inode), desc->fh); 280 return 0; 281} 282 283#ifdef CONFIG_NFS_V4_SECURITY_LABEL 284static void nfs_clear_label_invalid(struct inode *inode) 285{ 286 spin_lock(&inode->i_lock); 287 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; 288 spin_unlock(&inode->i_lock); 289} 290 291void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 292 struct nfs4_label *label) 293{ 294 int error; 295 296 if (label == NULL) 297 return; 298 299 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 300 error = security_inode_notifysecctx(inode, label->label, 301 label->len); 302 if (error) 303 printk(KERN_ERR "%s() %s %d " 304 "security_inode_notifysecctx() %d\n", 305 __func__, 306 (char *)label->label, 307 label->len, error); 308 nfs_clear_label_invalid(inode); 309 } 310} 311 312struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 313{ 314 struct nfs4_label *label = NULL; 315 int minor_version = server->nfs_client->cl_minorversion; 316 317 if (minor_version < 2) 318 return label; 319 320 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 321 return label; 322 323 label = kzalloc(sizeof(struct nfs4_label), flags); 324 if (label == NULL) 325 return ERR_PTR(-ENOMEM); 326 327 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 328 if (label->label == NULL) { 329 kfree(label); 330 return ERR_PTR(-ENOMEM); 331 } 332 label->len = NFS4_MAXLABELLEN; 333 334 return label; 335} 336EXPORT_SYMBOL_GPL(nfs4_label_alloc); 337#else 338void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 339 struct nfs4_label *label) 340{ 341} 342#endif 343EXPORT_SYMBOL_GPL(nfs_setsecurity); 344 345/* 346 * This is our front-end to iget that looks up inodes by file handle 347 * instead of inode number. 348 */ 349struct inode * 350nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label) 351{ 352 struct nfs_find_desc desc = { 353 .fh = fh, 354 .fattr = fattr 355 }; 356 struct inode *inode = ERR_PTR(-ENOENT); 357 unsigned long hash; 358 359 nfs_attr_check_mountpoint(sb, fattr); 360 361 if (nfs_attr_use_mounted_on_fileid(fattr)) 362 fattr->fileid = fattr->mounted_on_fileid; 363 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 364 goto out_no_inode; 365 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 366 goto out_no_inode; 367 368 hash = nfs_fattr_to_ino_t(fattr); 369 370 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 371 if (inode == NULL) { 372 inode = ERR_PTR(-ENOMEM); 373 goto out_no_inode; 374 } 375 376 if (inode->i_state & I_NEW) { 377 struct nfs_inode *nfsi = NFS_I(inode); 378 unsigned long now = jiffies; 379 380 /* We set i_ino for the few things that still rely on it, 381 * such as stat(2) */ 382 inode->i_ino = hash; 383 384 /* We can't support update_atime(), since the server will reset it */ 385 inode->i_flags |= S_NOATIME|S_NOCMTIME; 386 inode->i_mode = fattr->mode; 387 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 388 && nfs_server_capable(inode, NFS_CAP_MODE)) 389 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 390 /* Why so? Because we want revalidate for devices/FIFOs, and 391 * that's precisely what we have in nfs_file_inode_operations. 392 */ 393 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 394 if (S_ISREG(inode->i_mode)) { 395 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 396 inode->i_data.a_ops = &nfs_file_aops; 397 } else if (S_ISDIR(inode->i_mode)) { 398 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 399 inode->i_fop = &nfs_dir_operations; 400 inode->i_data.a_ops = &nfs_dir_aops; 401 /* Deal with crossing mountpoints */ 402 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 403 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 404 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 405 inode->i_op = &nfs_referral_inode_operations; 406 else 407 inode->i_op = &nfs_mountpoint_inode_operations; 408 inode->i_fop = NULL; 409 inode->i_flags |= S_AUTOMOUNT; 410 } 411 } else if (S_ISLNK(inode->i_mode)) 412 inode->i_op = &nfs_symlink_inode_operations; 413 else 414 init_special_inode(inode, inode->i_mode, fattr->rdev); 415 416 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 417 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 418 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 419 inode->i_version = 0; 420 inode->i_size = 0; 421 clear_nlink(inode); 422 inode->i_uid = make_kuid(&init_user_ns, -2); 423 inode->i_gid = make_kgid(&init_user_ns, -2); 424 inode->i_blocks = 0; 425 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 426 nfsi->write_io = 0; 427 nfsi->read_io = 0; 428 429 nfsi->read_cache_jiffies = fattr->time_start; 430 nfsi->attr_gencount = fattr->gencount; 431 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 432 inode->i_atime = fattr->atime; 433 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 434 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 435 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 436 inode->i_mtime = fattr->mtime; 437 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 438 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 439 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 440 inode->i_ctime = fattr->ctime; 441 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 442 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 443 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 444 inode->i_version = fattr->change_attr; 445 else 446 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 447 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 448 inode->i_size = nfs_size_to_loff_t(fattr->size); 449 else 450 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR 451 | NFS_INO_REVAL_PAGECACHE); 452 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 453 set_nlink(inode, fattr->nlink); 454 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 455 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 456 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 457 inode->i_uid = fattr->uid; 458 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 459 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 460 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 461 inode->i_gid = fattr->gid; 462 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 463 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR); 464 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 465 inode->i_blocks = fattr->du.nfs2.blocks; 466 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 467 /* 468 * report the blocks in 512byte units 469 */ 470 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 471 } 472 473 nfs_setsecurity(inode, fattr, label); 474 475 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 476 nfsi->attrtimeo_timestamp = now; 477 nfsi->access_cache = RB_ROOT; 478 479 nfs_fscache_init_inode(inode); 480 481 unlock_new_inode(inode); 482 } else 483 nfs_refresh_inode(inode, fattr); 484 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", 485 inode->i_sb->s_id, 486 (unsigned long long)NFS_FILEID(inode), 487 nfs_display_fhandle_hash(fh), 488 atomic_read(&inode->i_count)); 489 490out: 491 return inode; 492 493out_no_inode: 494 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 495 goto out; 496} 497EXPORT_SYMBOL_GPL(nfs_fhget); 498 499#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) 500 501int 502nfs_setattr(struct dentry *dentry, struct iattr *attr) 503{ 504 struct inode *inode = d_inode(dentry); 505 struct nfs_fattr *fattr; 506 int error = -ENOMEM; 507 508 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 509 510 /* skip mode change if it's just for clearing setuid/setgid */ 511 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 512 attr->ia_valid &= ~ATTR_MODE; 513 514 if (attr->ia_valid & ATTR_SIZE) { 515 loff_t i_size; 516 517 BUG_ON(!S_ISREG(inode->i_mode)); 518 519 i_size = i_size_read(inode); 520 if (attr->ia_size == i_size) 521 attr->ia_valid &= ~ATTR_SIZE; 522 else if (attr->ia_size < i_size && IS_SWAPFILE(inode)) 523 return -ETXTBSY; 524 } 525 526 /* Optimization: if the end result is no change, don't RPC */ 527 attr->ia_valid &= NFS_VALID_ATTRS; 528 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 529 return 0; 530 531 trace_nfs_setattr_enter(inode); 532 533 /* Write all dirty data */ 534 if (S_ISREG(inode->i_mode)) 535 nfs_sync_inode(inode); 536 537 fattr = nfs_alloc_fattr(); 538 if (fattr == NULL) 539 goto out; 540 /* 541 * Return any delegations if we're going to change ACLs 542 */ 543 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 544 NFS_PROTO(inode)->return_delegation(inode); 545 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 546 if (error == 0) 547 error = nfs_refresh_inode(inode, fattr); 548 nfs_free_fattr(fattr); 549out: 550 trace_nfs_setattr_exit(inode, error); 551 return error; 552} 553EXPORT_SYMBOL_GPL(nfs_setattr); 554 555/** 556 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 557 * @inode: inode of the file used 558 * @offset: file offset to start truncating 559 * 560 * This is a copy of the common vmtruncate, but with the locking 561 * corrected to take into account the fact that NFS requires 562 * inode->i_size to be updated under the inode->i_lock. 563 * Note: must be called with inode->i_lock held! 564 */ 565static int nfs_vmtruncate(struct inode * inode, loff_t offset) 566{ 567 int err; 568 569 err = inode_newsize_ok(inode, offset); 570 if (err) 571 goto out; 572 573 i_size_write(inode, offset); 574 /* Optimisation */ 575 if (offset == 0) 576 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; 577 578 spin_unlock(&inode->i_lock); 579 truncate_pagecache(inode, offset); 580 spin_lock(&inode->i_lock); 581out: 582 return err; 583} 584 585/** 586 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 587 * @inode: pointer to struct inode 588 * @attr: pointer to struct iattr 589 * 590 * Note: we do this in the *proc.c in order to ensure that 591 * it works for things like exclusive creates too. 592 */ 593void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, 594 struct nfs_fattr *fattr) 595{ 596 /* Barrier: bump the attribute generation count. */ 597 nfs_fattr_set_barrier(fattr); 598 599 spin_lock(&inode->i_lock); 600 NFS_I(inode)->attr_gencount = fattr->gencount; 601 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 602 if ((attr->ia_valid & ATTR_MODE) != 0) { 603 int mode = attr->ia_mode & S_IALLUGO; 604 mode |= inode->i_mode & ~S_IALLUGO; 605 inode->i_mode = mode; 606 } 607 if ((attr->ia_valid & ATTR_UID) != 0) 608 inode->i_uid = attr->ia_uid; 609 if ((attr->ia_valid & ATTR_GID) != 0) 610 inode->i_gid = attr->ia_gid; 611 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS 612 | NFS_INO_INVALID_ACL); 613 } 614 if ((attr->ia_valid & ATTR_SIZE) != 0) { 615 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 616 nfs_vmtruncate(inode, attr->ia_size); 617 } 618 nfs_update_inode(inode, fattr); 619 spin_unlock(&inode->i_lock); 620} 621EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 622 623static void nfs_request_parent_use_readdirplus(struct dentry *dentry) 624{ 625 struct dentry *parent; 626 627 parent = dget_parent(dentry); 628 nfs_force_use_readdirplus(d_inode(parent)); 629 dput(parent); 630} 631 632static bool nfs_need_revalidate_inode(struct inode *inode) 633{ 634 if (NFS_I(inode)->cache_validity & 635 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 636 return true; 637 if (nfs_attribute_cache_expired(inode)) 638 return true; 639 return false; 640} 641 642int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 643{ 644 struct inode *inode = d_inode(dentry); 645 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 646 int err = 0; 647 648 trace_nfs_getattr_enter(inode); 649 /* Flush out writes to the server in order to update c/mtime. */ 650 if (S_ISREG(inode->i_mode)) { 651 mutex_lock(&inode->i_mutex); 652 err = nfs_sync_inode(inode); 653 mutex_unlock(&inode->i_mutex); 654 if (err) 655 goto out; 656 } 657 658 /* 659 * We may force a getattr if the user cares about atime. 660 * 661 * Note that we only have to check the vfsmount flags here: 662 * - NFS always sets S_NOATIME by so checking it would give a 663 * bogus result 664 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 665 * no point in checking those. 666 */ 667 if ((mnt->mnt_flags & MNT_NOATIME) || 668 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 669 need_atime = 0; 670 671 if (need_atime || nfs_need_revalidate_inode(inode)) { 672 struct nfs_server *server = NFS_SERVER(inode); 673 674 if (server->caps & NFS_CAP_READDIRPLUS) 675 nfs_request_parent_use_readdirplus(dentry); 676 err = __nfs_revalidate_inode(server, inode); 677 } 678 if (!err) { 679 generic_fillattr(inode, stat); 680 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 681 } 682out: 683 trace_nfs_getattr_exit(inode, err); 684 return err; 685} 686EXPORT_SYMBOL_GPL(nfs_getattr); 687 688static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 689{ 690 atomic_set(&l_ctx->count, 1); 691 l_ctx->lockowner.l_owner = current->files; 692 l_ctx->lockowner.l_pid = current->tgid; 693 INIT_LIST_HEAD(&l_ctx->list); 694 nfs_iocounter_init(&l_ctx->io_count); 695} 696 697static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 698{ 699 struct nfs_lock_context *head = &ctx->lock_context; 700 struct nfs_lock_context *pos = head; 701 702 do { 703 if (pos->lockowner.l_owner != current->files) 704 continue; 705 if (pos->lockowner.l_pid != current->tgid) 706 continue; 707 atomic_inc(&pos->count); 708 return pos; 709 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 710 return NULL; 711} 712 713struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 714{ 715 struct nfs_lock_context *res, *new = NULL; 716 struct inode *inode = d_inode(ctx->dentry); 717 718 spin_lock(&inode->i_lock); 719 res = __nfs_find_lock_context(ctx); 720 if (res == NULL) { 721 spin_unlock(&inode->i_lock); 722 new = kmalloc(sizeof(*new), GFP_KERNEL); 723 if (new == NULL) 724 return ERR_PTR(-ENOMEM); 725 nfs_init_lock_context(new); 726 spin_lock(&inode->i_lock); 727 res = __nfs_find_lock_context(ctx); 728 if (res == NULL) { 729 list_add_tail(&new->list, &ctx->lock_context.list); 730 new->open_context = ctx; 731 res = new; 732 new = NULL; 733 } 734 } 735 spin_unlock(&inode->i_lock); 736 kfree(new); 737 return res; 738} 739EXPORT_SYMBOL_GPL(nfs_get_lock_context); 740 741void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 742{ 743 struct nfs_open_context *ctx = l_ctx->open_context; 744 struct inode *inode = d_inode(ctx->dentry); 745 746 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 747 return; 748 list_del(&l_ctx->list); 749 spin_unlock(&inode->i_lock); 750 kfree(l_ctx); 751} 752EXPORT_SYMBOL_GPL(nfs_put_lock_context); 753 754/** 755 * nfs_close_context - Common close_context() routine NFSv2/v3 756 * @ctx: pointer to context 757 * @is_sync: is this a synchronous close 758 * 759 * always ensure that the attributes are up to date if we're mounted 760 * with close-to-open semantics 761 */ 762void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 763{ 764 struct inode *inode; 765 struct nfs_server *server; 766 767 if (!(ctx->mode & FMODE_WRITE)) 768 return; 769 if (!is_sync) 770 return; 771 inode = d_inode(ctx->dentry); 772 if (!list_empty(&NFS_I(inode)->open_files)) 773 return; 774 server = NFS_SERVER(inode); 775 if (server->flags & NFS_MOUNT_NOCTO) 776 return; 777 nfs_revalidate_inode(server, inode); 778} 779EXPORT_SYMBOL_GPL(nfs_close_context); 780 781struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 782{ 783 struct nfs_open_context *ctx; 784 struct rpc_cred *cred = rpc_lookup_cred(); 785 if (IS_ERR(cred)) 786 return ERR_CAST(cred); 787 788 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 789 if (!ctx) { 790 put_rpccred(cred); 791 return ERR_PTR(-ENOMEM); 792 } 793 nfs_sb_active(dentry->d_sb); 794 ctx->dentry = dget(dentry); 795 ctx->cred = cred; 796 ctx->state = NULL; 797 ctx->mode = f_mode; 798 ctx->flags = 0; 799 ctx->error = 0; 800 nfs_init_lock_context(&ctx->lock_context); 801 ctx->lock_context.open_context = ctx; 802 INIT_LIST_HEAD(&ctx->list); 803 ctx->mdsthreshold = NULL; 804 return ctx; 805} 806EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 807 808struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 809{ 810 if (ctx != NULL) 811 atomic_inc(&ctx->lock_context.count); 812 return ctx; 813} 814EXPORT_SYMBOL_GPL(get_nfs_open_context); 815 816static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 817{ 818 struct inode *inode = d_inode(ctx->dentry); 819 struct super_block *sb = ctx->dentry->d_sb; 820 821 if (!list_empty(&ctx->list)) { 822 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 823 return; 824 list_del(&ctx->list); 825 spin_unlock(&inode->i_lock); 826 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 827 return; 828 if (inode != NULL) 829 NFS_PROTO(inode)->close_context(ctx, is_sync); 830 if (ctx->cred != NULL) 831 put_rpccred(ctx->cred); 832 dput(ctx->dentry); 833 nfs_sb_deactive(sb); 834 kfree(ctx->mdsthreshold); 835 kfree(ctx); 836} 837 838void put_nfs_open_context(struct nfs_open_context *ctx) 839{ 840 __put_nfs_open_context(ctx, 0); 841} 842EXPORT_SYMBOL_GPL(put_nfs_open_context); 843 844/* 845 * Ensure that mmap has a recent RPC credential for use when writing out 846 * shared pages 847 */ 848void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 849{ 850 struct inode *inode = d_inode(ctx->dentry); 851 struct nfs_inode *nfsi = NFS_I(inode); 852 853 spin_lock(&inode->i_lock); 854 list_add(&ctx->list, &nfsi->open_files); 855 spin_unlock(&inode->i_lock); 856} 857EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 858 859void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 860{ 861 filp->private_data = get_nfs_open_context(ctx); 862 if (list_empty(&ctx->list)) 863 nfs_inode_attach_open_context(ctx); 864} 865EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 866 867/* 868 * Given an inode, search for an open context with the desired characteristics 869 */ 870struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 871{ 872 struct nfs_inode *nfsi = NFS_I(inode); 873 struct nfs_open_context *pos, *ctx = NULL; 874 875 spin_lock(&inode->i_lock); 876 list_for_each_entry(pos, &nfsi->open_files, list) { 877 if (cred != NULL && pos->cred != cred) 878 continue; 879 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 880 continue; 881 ctx = get_nfs_open_context(pos); 882 break; 883 } 884 spin_unlock(&inode->i_lock); 885 return ctx; 886} 887 888static void nfs_file_clear_open_context(struct file *filp) 889{ 890 struct nfs_open_context *ctx = nfs_file_open_context(filp); 891 892 if (ctx) { 893 struct inode *inode = d_inode(ctx->dentry); 894 895 filp->private_data = NULL; 896 spin_lock(&inode->i_lock); 897 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 898 spin_unlock(&inode->i_lock); 899 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 900 } 901} 902 903/* 904 * These allocate and release file read/write context information. 905 */ 906int nfs_open(struct inode *inode, struct file *filp) 907{ 908 struct nfs_open_context *ctx; 909 910 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 911 if (IS_ERR(ctx)) 912 return PTR_ERR(ctx); 913 nfs_file_set_open_context(filp, ctx); 914 put_nfs_open_context(ctx); 915 nfs_fscache_open_file(inode, filp); 916 return 0; 917} 918 919int nfs_release(struct inode *inode, struct file *filp) 920{ 921 nfs_file_clear_open_context(filp); 922 return 0; 923} 924 925/* 926 * This function is called whenever some part of NFS notices that 927 * the cached attributes have to be refreshed. 928 */ 929int 930__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 931{ 932 int status = -ESTALE; 933 struct nfs4_label *label = NULL; 934 struct nfs_fattr *fattr = NULL; 935 struct nfs_inode *nfsi = NFS_I(inode); 936 937 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", 938 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); 939 940 trace_nfs_revalidate_inode_enter(inode); 941 942 if (is_bad_inode(inode)) 943 goto out; 944 if (NFS_STALE(inode)) 945 goto out; 946 947 status = -ENOMEM; 948 fattr = nfs_alloc_fattr(); 949 if (fattr == NULL) 950 goto out; 951 952 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 953 954 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 955 if (IS_ERR(label)) { 956 status = PTR_ERR(label); 957 goto out; 958 } 959 960 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 961 if (status != 0) { 962 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", 963 inode->i_sb->s_id, 964 (unsigned long long)NFS_FILEID(inode), status); 965 if (status == -ESTALE) { 966 nfs_zap_caches(inode); 967 if (!S_ISDIR(inode->i_mode)) 968 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 969 } 970 goto err_out; 971 } 972 973 status = nfs_refresh_inode(inode, fattr); 974 if (status) { 975 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", 976 inode->i_sb->s_id, 977 (unsigned long long)NFS_FILEID(inode), status); 978 goto err_out; 979 } 980 981 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 982 nfs_zap_acl_cache(inode); 983 984 nfs_setsecurity(inode, fattr, label); 985 986 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", 987 inode->i_sb->s_id, 988 (unsigned long long)NFS_FILEID(inode)); 989 990err_out: 991 nfs4_label_free(label); 992out: 993 nfs_free_fattr(fattr); 994 trace_nfs_revalidate_inode_exit(inode, status); 995 return status; 996} 997 998int nfs_attribute_timeout(struct inode *inode) 999{ 1000 struct nfs_inode *nfsi = NFS_I(inode); 1001 1002 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 1003} 1004 1005int nfs_attribute_cache_expired(struct inode *inode) 1006{ 1007 if (nfs_have_delegated_attributes(inode)) 1008 return 0; 1009 return nfs_attribute_timeout(inode); 1010} 1011 1012/** 1013 * nfs_revalidate_inode - Revalidate the inode attributes 1014 * @server - pointer to nfs_server struct 1015 * @inode - pointer to inode struct 1016 * 1017 * Updates inode attribute information by retrieving the data from the server. 1018 */ 1019int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1020{ 1021 if (!nfs_need_revalidate_inode(inode)) 1022 return NFS_STALE(inode) ? -ESTALE : 0; 1023 return __nfs_revalidate_inode(server, inode); 1024} 1025EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 1026 1027int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode) 1028{ 1029 if (!(NFS_I(inode)->cache_validity & 1030 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 1031 && !nfs_attribute_cache_expired(inode)) 1032 return NFS_STALE(inode) ? -ESTALE : 0; 1033 return -ECHILD; 1034} 1035 1036static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 1037{ 1038 struct nfs_inode *nfsi = NFS_I(inode); 1039 int ret; 1040 1041 if (mapping->nrpages != 0) { 1042 if (S_ISREG(inode->i_mode)) { 1043 unmap_mapping_range(mapping, 0, 0, 0); 1044 ret = nfs_sync_mapping(mapping); 1045 if (ret < 0) 1046 return ret; 1047 } 1048 ret = invalidate_inode_pages2(mapping); 1049 if (ret < 0) 1050 return ret; 1051 } 1052 if (S_ISDIR(inode->i_mode)) { 1053 spin_lock(&inode->i_lock); 1054 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1055 spin_unlock(&inode->i_lock); 1056 } 1057 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 1058 nfs_fscache_wait_on_invalidate(inode); 1059 1060 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", 1061 inode->i_sb->s_id, 1062 (unsigned long long)NFS_FILEID(inode)); 1063 return 0; 1064} 1065 1066static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1067{ 1068 if (nfs_have_delegated_attributes(inode)) 1069 return false; 1070 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 1071 || nfs_attribute_timeout(inode) 1072 || NFS_STALE(inode); 1073} 1074 1075/** 1076 * __nfs_revalidate_mapping - Revalidate the pagecache 1077 * @inode - pointer to host inode 1078 * @mapping - pointer to mapping 1079 * @may_lock - take inode->i_mutex? 1080 */ 1081static int __nfs_revalidate_mapping(struct inode *inode, 1082 struct address_space *mapping, 1083 bool may_lock) 1084{ 1085 struct nfs_inode *nfsi = NFS_I(inode); 1086 unsigned long *bitlock = &nfsi->flags; 1087 int ret = 0; 1088 1089 /* swapfiles are not supposed to be shared. */ 1090 if (IS_SWAPFILE(inode)) 1091 goto out; 1092 1093 if (nfs_mapping_need_revalidate_inode(inode)) { 1094 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1095 if (ret < 0) 1096 goto out; 1097 } 1098 1099 /* 1100 * We must clear NFS_INO_INVALID_DATA first to ensure that 1101 * invalidations that come in while we're shooting down the mappings 1102 * are respected. But, that leaves a race window where one revalidator 1103 * can clear the flag, and then another checks it before the mapping 1104 * gets invalidated. Fix that by serializing access to this part of 1105 * the function. 1106 * 1107 * At the same time, we need to allow other tasks to see whether we 1108 * might be in the middle of invalidating the pages, so we only set 1109 * the bit lock here if it looks like we're going to be doing that. 1110 */ 1111 for (;;) { 1112 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, 1113 nfs_wait_bit_killable, TASK_KILLABLE); 1114 if (ret) 1115 goto out; 1116 spin_lock(&inode->i_lock); 1117 if (test_bit(NFS_INO_INVALIDATING, bitlock)) { 1118 spin_unlock(&inode->i_lock); 1119 continue; 1120 } 1121 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1122 break; 1123 spin_unlock(&inode->i_lock); 1124 goto out; 1125 } 1126 1127 set_bit(NFS_INO_INVALIDATING, bitlock); 1128 smp_wmb(); 1129 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 1130 spin_unlock(&inode->i_lock); 1131 trace_nfs_invalidate_mapping_enter(inode); 1132 if (may_lock) { 1133 mutex_lock(&inode->i_mutex); 1134 ret = nfs_invalidate_mapping(inode, mapping); 1135 mutex_unlock(&inode->i_mutex); 1136 } else 1137 ret = nfs_invalidate_mapping(inode, mapping); 1138 trace_nfs_invalidate_mapping_exit(inode, ret); 1139 1140 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); 1141 smp_mb__after_atomic(); 1142 wake_up_bit(bitlock, NFS_INO_INVALIDATING); 1143out: 1144 return ret; 1145} 1146 1147/** 1148 * nfs_revalidate_mapping - Revalidate the pagecache 1149 * @inode - pointer to host inode 1150 * @mapping - pointer to mapping 1151 */ 1152int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1153{ 1154 return __nfs_revalidate_mapping(inode, mapping, false); 1155} 1156 1157/** 1158 * nfs_revalidate_mapping_protected - Revalidate the pagecache 1159 * @inode - pointer to host inode 1160 * @mapping - pointer to mapping 1161 * 1162 * Differs from nfs_revalidate_mapping() in that it grabs the inode->i_mutex 1163 * while invalidating the mapping. 1164 */ 1165int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping) 1166{ 1167 return __nfs_revalidate_mapping(inode, mapping, true); 1168} 1169 1170static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1171{ 1172 struct nfs_inode *nfsi = NFS_I(inode); 1173 unsigned long ret = 0; 1174 1175 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1176 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1177 && inode->i_version == fattr->pre_change_attr) { 1178 inode->i_version = fattr->change_attr; 1179 if (S_ISDIR(inode->i_mode)) 1180 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1181 ret |= NFS_INO_INVALID_ATTR; 1182 } 1183 /* If we have atomic WCC data, we may update some attributes */ 1184 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1185 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1186 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1187 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1188 ret |= NFS_INO_INVALID_ATTR; 1189 } 1190 1191 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1192 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1193 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1194 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1195 if (S_ISDIR(inode->i_mode)) 1196 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); 1197 ret |= NFS_INO_INVALID_ATTR; 1198 } 1199 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1200 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1201 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1202 && nfsi->nrequests == 0) { 1203 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1204 ret |= NFS_INO_INVALID_ATTR; 1205 } 1206 1207 return ret; 1208} 1209 1210/** 1211 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1212 * @inode - pointer to inode 1213 * @fattr - updated attributes 1214 * 1215 * Verifies the attribute cache. If we have just changed the attributes, 1216 * so that fattr carries weak cache consistency data, then it may 1217 * also update the ctime/mtime/change_attribute. 1218 */ 1219static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1220{ 1221 struct nfs_inode *nfsi = NFS_I(inode); 1222 loff_t cur_size, new_isize; 1223 unsigned long invalid = 0; 1224 1225 1226 if (nfs_have_delegated_attributes(inode)) 1227 return 0; 1228 /* Has the inode gone and changed behind our back? */ 1229 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1230 return -EIO; 1231 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1232 return -EIO; 1233 1234 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1235 inode->i_version != fattr->change_attr) 1236 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1237 1238 /* Verify a few of the more important attributes */ 1239 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1240 invalid |= NFS_INO_INVALID_ATTR; 1241 1242 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1243 cur_size = i_size_read(inode); 1244 new_isize = nfs_size_to_loff_t(fattr->size); 1245 if (cur_size != new_isize) 1246 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1247 } 1248 if (nfsi->nrequests != 0) 1249 invalid &= ~NFS_INO_REVAL_PAGECACHE; 1250 1251 /* Have any file permissions changed? */ 1252 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1253 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1254 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1255 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1256 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1257 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1258 1259 /* Has the link count changed? */ 1260 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1261 invalid |= NFS_INO_INVALID_ATTR; 1262 1263 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1264 invalid |= NFS_INO_INVALID_ATIME; 1265 1266 if (invalid != 0) 1267 nfs_set_cache_invalid(inode, invalid); 1268 1269 nfsi->read_cache_jiffies = fattr->time_start; 1270 return 0; 1271} 1272 1273static atomic_long_t nfs_attr_generation_counter; 1274 1275static unsigned long nfs_read_attr_generation_counter(void) 1276{ 1277 return atomic_long_read(&nfs_attr_generation_counter); 1278} 1279 1280unsigned long nfs_inc_attr_generation_counter(void) 1281{ 1282 return atomic_long_inc_return(&nfs_attr_generation_counter); 1283} 1284EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); 1285 1286void nfs_fattr_init(struct nfs_fattr *fattr) 1287{ 1288 fattr->valid = 0; 1289 fattr->time_start = jiffies; 1290 fattr->gencount = nfs_inc_attr_generation_counter(); 1291 fattr->owner_name = NULL; 1292 fattr->group_name = NULL; 1293} 1294EXPORT_SYMBOL_GPL(nfs_fattr_init); 1295 1296/** 1297 * nfs_fattr_set_barrier 1298 * @fattr: attributes 1299 * 1300 * Used to set a barrier after an attribute was updated. This 1301 * barrier ensures that older attributes from RPC calls that may 1302 * have raced with our update cannot clobber these new values. 1303 * Note that you are still responsible for ensuring that other 1304 * operations which change the attribute on the server do not 1305 * collide. 1306 */ 1307void nfs_fattr_set_barrier(struct nfs_fattr *fattr) 1308{ 1309 fattr->gencount = nfs_inc_attr_generation_counter(); 1310} 1311 1312struct nfs_fattr *nfs_alloc_fattr(void) 1313{ 1314 struct nfs_fattr *fattr; 1315 1316 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1317 if (fattr != NULL) 1318 nfs_fattr_init(fattr); 1319 return fattr; 1320} 1321EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1322 1323struct nfs_fh *nfs_alloc_fhandle(void) 1324{ 1325 struct nfs_fh *fh; 1326 1327 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1328 if (fh != NULL) 1329 fh->size = 0; 1330 return fh; 1331} 1332EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1333 1334#ifdef NFS_DEBUG 1335/* 1336 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1337 * in the same way that wireshark does 1338 * 1339 * @fh: file handle 1340 * 1341 * For debugging only. 1342 */ 1343u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1344{ 1345 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1346 * not on the result */ 1347 return nfs_fhandle_hash(fh); 1348} 1349EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); 1350 1351/* 1352 * _nfs_display_fhandle - display an NFS file handle on the console 1353 * 1354 * @fh: file handle to display 1355 * @caption: display caption 1356 * 1357 * For debugging only. 1358 */ 1359void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1360{ 1361 unsigned short i; 1362 1363 if (fh == NULL || fh->size == 0) { 1364 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1365 return; 1366 } 1367 1368 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1369 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1370 for (i = 0; i < fh->size; i += 16) { 1371 __be32 *pos = (__be32 *)&fh->data[i]; 1372 1373 switch ((fh->size - i - 1) >> 2) { 1374 case 0: 1375 printk(KERN_DEFAULT " %08x\n", 1376 be32_to_cpup(pos)); 1377 break; 1378 case 1: 1379 printk(KERN_DEFAULT " %08x %08x\n", 1380 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1381 break; 1382 case 2: 1383 printk(KERN_DEFAULT " %08x %08x %08x\n", 1384 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1385 be32_to_cpup(pos + 2)); 1386 break; 1387 default: 1388 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1389 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1390 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1391 } 1392 } 1393} 1394EXPORT_SYMBOL_GPL(_nfs_display_fhandle); 1395#endif 1396 1397/** 1398 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1399 * @inode - pointer to inode 1400 * @fattr - attributes 1401 * 1402 * Attempt to divine whether or not an RPC call reply carrying stale 1403 * attributes got scheduled after another call carrying updated ones. 1404 * 1405 * To do so, the function first assumes that a more recent ctime means 1406 * that the attributes in fattr are newer, however it also attempt to 1407 * catch the case where ctime either didn't change, or went backwards 1408 * (if someone reset the clock on the server) by looking at whether 1409 * or not this RPC call was started after the inode was last updated. 1410 * Note also the check for wraparound of 'attr_gencount' 1411 * 1412 * The function returns 'true' if it thinks the attributes in 'fattr' are 1413 * more recent than the ones cached in the inode. 1414 * 1415 */ 1416static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1417{ 1418 const struct nfs_inode *nfsi = NFS_I(inode); 1419 1420 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1421 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1422} 1423 1424/* 1425 * Don't trust the change_attribute, mtime, ctime or size if 1426 * a pnfs LAYOUTCOMMIT is outstanding 1427 */ 1428static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode, 1429 struct nfs_fattr *fattr) 1430{ 1431 if (pnfs_layoutcommit_outstanding(inode)) 1432 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE | 1433 NFS_ATTR_FATTR_MTIME | 1434 NFS_ATTR_FATTR_CTIME | 1435 NFS_ATTR_FATTR_SIZE); 1436} 1437 1438static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1439{ 1440 int ret; 1441 1442 trace_nfs_refresh_inode_enter(inode); 1443 1444 nfs_inode_attrs_handle_layoutcommit(inode, fattr); 1445 1446 if (nfs_inode_attrs_need_update(inode, fattr)) 1447 ret = nfs_update_inode(inode, fattr); 1448 else 1449 ret = nfs_check_inode_attributes(inode, fattr); 1450 1451 trace_nfs_refresh_inode_exit(inode, ret); 1452 return ret; 1453} 1454 1455/** 1456 * nfs_refresh_inode - try to update the inode attribute cache 1457 * @inode - pointer to inode 1458 * @fattr - updated attributes 1459 * 1460 * Check that an RPC call that returned attributes has not overlapped with 1461 * other recent updates of the inode metadata, then decide whether it is 1462 * safe to do a full update of the inode attributes, or whether just to 1463 * call nfs_check_inode_attributes. 1464 */ 1465int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1466{ 1467 int status; 1468 1469 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1470 return 0; 1471 spin_lock(&inode->i_lock); 1472 status = nfs_refresh_inode_locked(inode, fattr); 1473 spin_unlock(&inode->i_lock); 1474 1475 return status; 1476} 1477EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1478 1479static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1480{ 1481 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1482 1483 /* 1484 * Don't revalidate the pagecache if we hold a delegation, but do 1485 * force an attribute update 1486 */ 1487 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1488 invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED; 1489 1490 if (S_ISDIR(inode->i_mode)) 1491 invalid |= NFS_INO_INVALID_DATA; 1492 nfs_set_cache_invalid(inode, invalid); 1493 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1494 return 0; 1495 return nfs_refresh_inode_locked(inode, fattr); 1496} 1497 1498/** 1499 * nfs_post_op_update_inode - try to update the inode attribute cache 1500 * @inode - pointer to inode 1501 * @fattr - updated attributes 1502 * 1503 * After an operation that has changed the inode metadata, mark the 1504 * attribute cache as being invalid, then try to update it. 1505 * 1506 * NB: if the server didn't return any post op attributes, this 1507 * function will force the retrieval of attributes before the next 1508 * NFS request. Thus it should be used only for operations that 1509 * are expected to change one or more attributes, to avoid 1510 * unnecessary NFS requests and trips through nfs_update_inode(). 1511 */ 1512int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1513{ 1514 int status; 1515 1516 spin_lock(&inode->i_lock); 1517 nfs_fattr_set_barrier(fattr); 1518 status = nfs_post_op_update_inode_locked(inode, fattr); 1519 spin_unlock(&inode->i_lock); 1520 1521 return status; 1522} 1523EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1524 1525/** 1526 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache 1527 * @inode - pointer to inode 1528 * @fattr - updated attributes 1529 * 1530 * After an operation that has changed the inode metadata, mark the 1531 * attribute cache as being invalid, then try to update it. Fake up 1532 * weak cache consistency data, if none exist. 1533 * 1534 * This function is mainly designed to be used by the ->write_done() functions. 1535 */ 1536int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) 1537{ 1538 int status; 1539 1540 /* Don't do a WCC update if these attributes are already stale */ 1541 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1542 !nfs_inode_attrs_need_update(inode, fattr)) { 1543 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1544 | NFS_ATTR_FATTR_PRESIZE 1545 | NFS_ATTR_FATTR_PREMTIME 1546 | NFS_ATTR_FATTR_PRECTIME); 1547 goto out_noforce; 1548 } 1549 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1550 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1551 fattr->pre_change_attr = inode->i_version; 1552 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1553 } 1554 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1555 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1556 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1557 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1558 } 1559 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1560 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1561 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1562 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1563 } 1564 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1565 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1566 fattr->pre_size = i_size_read(inode); 1567 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1568 } 1569out_noforce: 1570 status = nfs_post_op_update_inode_locked(inode, fattr); 1571 return status; 1572} 1573 1574/** 1575 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1576 * @inode - pointer to inode 1577 * @fattr - updated attributes 1578 * 1579 * After an operation that has changed the inode metadata, mark the 1580 * attribute cache as being invalid, then try to update it. Fake up 1581 * weak cache consistency data, if none exist. 1582 * 1583 * This function is mainly designed to be used by the ->write_done() functions. 1584 */ 1585int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1586{ 1587 int status; 1588 1589 spin_lock(&inode->i_lock); 1590 nfs_fattr_set_barrier(fattr); 1591 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); 1592 spin_unlock(&inode->i_lock); 1593 return status; 1594} 1595EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1596 1597 1598static inline bool nfs_fileid_valid(struct nfs_inode *nfsi, 1599 struct nfs_fattr *fattr) 1600{ 1601 bool ret1 = true, ret2 = true; 1602 1603 if (fattr->valid & NFS_ATTR_FATTR_FILEID) 1604 ret1 = (nfsi->fileid == fattr->fileid); 1605 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) 1606 ret2 = (nfsi->fileid == fattr->mounted_on_fileid); 1607 return ret1 || ret2; 1608} 1609 1610/* 1611 * Many nfs protocol calls return the new file attributes after 1612 * an operation. Here we update the inode to reflect the state 1613 * of the server's inode. 1614 * 1615 * This is a bit tricky because we have to make sure all dirty pages 1616 * have been sent off to the server before calling invalidate_inode_pages. 1617 * To make sure no other process adds more write requests while we try 1618 * our best to flush them, we make them sleep during the attribute refresh. 1619 * 1620 * A very similar scenario holds for the dir cache. 1621 */ 1622static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1623{ 1624 struct nfs_server *server; 1625 struct nfs_inode *nfsi = NFS_I(inode); 1626 loff_t cur_isize, new_isize; 1627 unsigned long invalid = 0; 1628 unsigned long now = jiffies; 1629 unsigned long save_cache_validity; 1630 bool cache_revalidated = true; 1631 1632 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", 1633 __func__, inode->i_sb->s_id, inode->i_ino, 1634 nfs_display_fhandle_hash(NFS_FH(inode)), 1635 atomic_read(&inode->i_count), fattr->valid); 1636 1637 if (!nfs_fileid_valid(nfsi, fattr)) { 1638 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1639 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1640 NFS_SERVER(inode)->nfs_client->cl_hostname, 1641 inode->i_sb->s_id, (long long)nfsi->fileid, 1642 (long long)fattr->fileid); 1643 goto out_err; 1644 } 1645 1646 /* 1647 * Make sure the inode's type hasn't changed. 1648 */ 1649 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1650 /* 1651 * Big trouble! The inode has become a different object. 1652 */ 1653 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", 1654 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1655 goto out_err; 1656 } 1657 1658 server = NFS_SERVER(inode); 1659 /* Update the fsid? */ 1660 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1661 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1662 !IS_AUTOMOUNT(inode)) 1663 server->fsid = fattr->fsid; 1664 1665 /* 1666 * Update the read time so we don't revalidate too often. 1667 */ 1668 nfsi->read_cache_jiffies = fattr->time_start; 1669 1670 save_cache_validity = nfsi->cache_validity; 1671 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1672 | NFS_INO_INVALID_ATIME 1673 | NFS_INO_REVAL_FORCED 1674 | NFS_INO_REVAL_PAGECACHE); 1675 1676 /* Do atomic weak cache consistency updates */ 1677 invalid |= nfs_wcc_update_inode(inode, fattr); 1678 1679 /* More cache consistency checks */ 1680 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1681 if (inode->i_version != fattr->change_attr) { 1682 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1683 inode->i_sb->s_id, inode->i_ino); 1684 invalid |= NFS_INO_INVALID_ATTR 1685 | NFS_INO_INVALID_DATA 1686 | NFS_INO_INVALID_ACCESS 1687 | NFS_INO_INVALID_ACL; 1688 if (S_ISDIR(inode->i_mode)) 1689 nfs_force_lookup_revalidate(inode); 1690 inode->i_version = fattr->change_attr; 1691 } 1692 } else { 1693 nfsi->cache_validity |= save_cache_validity; 1694 cache_revalidated = false; 1695 } 1696 1697 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1698 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1699 } else if (server->caps & NFS_CAP_MTIME) { 1700 nfsi->cache_validity |= save_cache_validity & 1701 (NFS_INO_INVALID_ATTR 1702 | NFS_INO_REVAL_FORCED); 1703 cache_revalidated = false; 1704 } 1705 1706 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1707 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1708 } else if (server->caps & NFS_CAP_CTIME) { 1709 nfsi->cache_validity |= save_cache_validity & 1710 (NFS_INO_INVALID_ATTR 1711 | NFS_INO_REVAL_FORCED); 1712 cache_revalidated = false; 1713 } 1714 1715 /* Check if our cached file size is stale */ 1716 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1717 new_isize = nfs_size_to_loff_t(fattr->size); 1718 cur_isize = i_size_read(inode); 1719 if (new_isize != cur_isize) { 1720 /* Do we perhaps have any outstanding writes, or has 1721 * the file grown beyond our last write? */ 1722 if ((nfsi->nrequests == 0) || new_isize > cur_isize) { 1723 i_size_write(inode, new_isize); 1724 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1725 } 1726 dprintk("NFS: isize change on server for file %s/%ld " 1727 "(%Ld to %Ld)\n", 1728 inode->i_sb->s_id, 1729 inode->i_ino, 1730 (long long)cur_isize, 1731 (long long)new_isize); 1732 } 1733 } else { 1734 nfsi->cache_validity |= save_cache_validity & 1735 (NFS_INO_INVALID_ATTR 1736 | NFS_INO_REVAL_PAGECACHE 1737 | NFS_INO_REVAL_FORCED); 1738 cache_revalidated = false; 1739 } 1740 1741 1742 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1743 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1744 else if (server->caps & NFS_CAP_ATIME) { 1745 nfsi->cache_validity |= save_cache_validity & 1746 (NFS_INO_INVALID_ATIME 1747 | NFS_INO_REVAL_FORCED); 1748 cache_revalidated = false; 1749 } 1750 1751 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1752 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1753 umode_t newmode = inode->i_mode & S_IFMT; 1754 newmode |= fattr->mode & S_IALLUGO; 1755 inode->i_mode = newmode; 1756 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1757 } 1758 } else if (server->caps & NFS_CAP_MODE) { 1759 nfsi->cache_validity |= save_cache_validity & 1760 (NFS_INO_INVALID_ATTR 1761 | NFS_INO_INVALID_ACCESS 1762 | NFS_INO_INVALID_ACL 1763 | NFS_INO_REVAL_FORCED); 1764 cache_revalidated = false; 1765 } 1766 1767 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1768 if (!uid_eq(inode->i_uid, fattr->uid)) { 1769 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1770 inode->i_uid = fattr->uid; 1771 } 1772 } else if (server->caps & NFS_CAP_OWNER) { 1773 nfsi->cache_validity |= save_cache_validity & 1774 (NFS_INO_INVALID_ATTR 1775 | NFS_INO_INVALID_ACCESS 1776 | NFS_INO_INVALID_ACL 1777 | NFS_INO_REVAL_FORCED); 1778 cache_revalidated = false; 1779 } 1780 1781 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1782 if (!gid_eq(inode->i_gid, fattr->gid)) { 1783 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1784 inode->i_gid = fattr->gid; 1785 } 1786 } else if (server->caps & NFS_CAP_OWNER_GROUP) { 1787 nfsi->cache_validity |= save_cache_validity & 1788 (NFS_INO_INVALID_ATTR 1789 | NFS_INO_INVALID_ACCESS 1790 | NFS_INO_INVALID_ACL 1791 | NFS_INO_REVAL_FORCED); 1792 cache_revalidated = false; 1793 } 1794 1795 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1796 if (inode->i_nlink != fattr->nlink) { 1797 invalid |= NFS_INO_INVALID_ATTR; 1798 if (S_ISDIR(inode->i_mode)) 1799 invalid |= NFS_INO_INVALID_DATA; 1800 set_nlink(inode, fattr->nlink); 1801 } 1802 } else if (server->caps & NFS_CAP_NLINK) { 1803 nfsi->cache_validity |= save_cache_validity & 1804 (NFS_INO_INVALID_ATTR 1805 | NFS_INO_REVAL_FORCED); 1806 cache_revalidated = false; 1807 } 1808 1809 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1810 /* 1811 * report the blocks in 512byte units 1812 */ 1813 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1814 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1815 inode->i_blocks = fattr->du.nfs2.blocks; 1816 else 1817 cache_revalidated = false; 1818 1819 /* Update attrtimeo value if we're out of the unstable period */ 1820 if (invalid & NFS_INO_INVALID_ATTR) { 1821 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1822 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1823 nfsi->attrtimeo_timestamp = now; 1824 /* Set barrier to be more recent than all outstanding updates */ 1825 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1826 } else { 1827 if (cache_revalidated) { 1828 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, 1829 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1830 nfsi->attrtimeo <<= 1; 1831 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) 1832 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1833 } 1834 nfsi->attrtimeo_timestamp = now; 1835 } 1836 /* Set the barrier to be more recent than this fattr */ 1837 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0) 1838 nfsi->attr_gencount = fattr->gencount; 1839 } 1840 1841 /* Don't declare attrcache up to date if there were no attrs! */ 1842 if (cache_revalidated) 1843 invalid &= ~NFS_INO_INVALID_ATTR; 1844 1845 /* Don't invalidate the data if we were to blame */ 1846 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1847 || S_ISLNK(inode->i_mode))) 1848 invalid &= ~NFS_INO_INVALID_DATA; 1849 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1850 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1851 nfs_set_cache_invalid(inode, invalid); 1852 1853 return 0; 1854 out_err: 1855 /* 1856 * No need to worry about unhashing the dentry, as the 1857 * lookup validation will know that the inode is bad. 1858 * (But we fall through to invalidate the caches.) 1859 */ 1860 nfs_invalidate_inode(inode); 1861 return -ESTALE; 1862} 1863 1864struct inode *nfs_alloc_inode(struct super_block *sb) 1865{ 1866 struct nfs_inode *nfsi; 1867 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1868 if (!nfsi) 1869 return NULL; 1870 nfsi->flags = 0UL; 1871 nfsi->cache_validity = 0UL; 1872#if IS_ENABLED(CONFIG_NFS_V4) 1873 nfsi->nfs4_acl = NULL; 1874#endif /* CONFIG_NFS_V4 */ 1875 return &nfsi->vfs_inode; 1876} 1877EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1878 1879static void nfs_i_callback(struct rcu_head *head) 1880{ 1881 struct inode *inode = container_of(head, struct inode, i_rcu); 1882 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1883} 1884 1885void nfs_destroy_inode(struct inode *inode) 1886{ 1887 call_rcu(&inode->i_rcu, nfs_i_callback); 1888} 1889EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1890 1891static inline void nfs4_init_once(struct nfs_inode *nfsi) 1892{ 1893#if IS_ENABLED(CONFIG_NFS_V4) 1894 INIT_LIST_HEAD(&nfsi->open_states); 1895 nfsi->delegation = NULL; 1896 init_rwsem(&nfsi->rwsem); 1897 nfsi->layout = NULL; 1898#endif 1899} 1900 1901static void init_once(void *foo) 1902{ 1903 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1904 1905 inode_init_once(&nfsi->vfs_inode); 1906 INIT_LIST_HEAD(&nfsi->open_files); 1907 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1908 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1909 INIT_LIST_HEAD(&nfsi->commit_info.list); 1910 nfsi->nrequests = 0; 1911 nfsi->commit_info.ncommit = 0; 1912 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1913 atomic_set(&nfsi->silly_count, 1); 1914 INIT_HLIST_HEAD(&nfsi->silly_list); 1915 init_waitqueue_head(&nfsi->waitqueue); 1916 nfs4_init_once(nfsi); 1917} 1918 1919static int __init nfs_init_inodecache(void) 1920{ 1921 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1922 sizeof(struct nfs_inode), 1923 0, (SLAB_RECLAIM_ACCOUNT| 1924 SLAB_MEM_SPREAD), 1925 init_once); 1926 if (nfs_inode_cachep == NULL) 1927 return -ENOMEM; 1928 1929 return 0; 1930} 1931 1932static void nfs_destroy_inodecache(void) 1933{ 1934 /* 1935 * Make sure all delayed rcu free inodes are flushed before we 1936 * destroy cache. 1937 */ 1938 rcu_barrier(); 1939 kmem_cache_destroy(nfs_inode_cachep); 1940} 1941 1942struct workqueue_struct *nfsiod_workqueue; 1943EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1944 1945/* 1946 * start up the nfsiod workqueue 1947 */ 1948static int nfsiod_start(void) 1949{ 1950 struct workqueue_struct *wq; 1951 dprintk("RPC: creating workqueue nfsiod\n"); 1952 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1953 if (wq == NULL) 1954 return -ENOMEM; 1955 nfsiod_workqueue = wq; 1956 return 0; 1957} 1958 1959/* 1960 * Destroy the nfsiod workqueue 1961 */ 1962static void nfsiod_stop(void) 1963{ 1964 struct workqueue_struct *wq; 1965 1966 wq = nfsiod_workqueue; 1967 if (wq == NULL) 1968 return; 1969 nfsiod_workqueue = NULL; 1970 destroy_workqueue(wq); 1971} 1972 1973int nfs_net_id; 1974EXPORT_SYMBOL_GPL(nfs_net_id); 1975 1976static int nfs_net_init(struct net *net) 1977{ 1978 nfs_clients_init(net); 1979 return nfs_fs_proc_net_init(net); 1980} 1981 1982static void nfs_net_exit(struct net *net) 1983{ 1984 nfs_fs_proc_net_exit(net); 1985 nfs_cleanup_cb_ident_idr(net); 1986} 1987 1988static struct pernet_operations nfs_net_ops = { 1989 .init = nfs_net_init, 1990 .exit = nfs_net_exit, 1991 .id = &nfs_net_id, 1992 .size = sizeof(struct nfs_net), 1993}; 1994 1995/* 1996 * Initialize NFS 1997 */ 1998static int __init init_nfs_fs(void) 1999{ 2000 int err; 2001 2002 err = register_pernet_subsys(&nfs_net_ops); 2003 if (err < 0) 2004 goto out9; 2005 2006 err = nfs_fscache_register(); 2007 if (err < 0) 2008 goto out8; 2009 2010 err = nfsiod_start(); 2011 if (err) 2012 goto out7; 2013 2014 err = nfs_fs_proc_init(); 2015 if (err) 2016 goto out6; 2017 2018 err = nfs_init_nfspagecache(); 2019 if (err) 2020 goto out5; 2021 2022 err = nfs_init_inodecache(); 2023 if (err) 2024 goto out4; 2025 2026 err = nfs_init_readpagecache(); 2027 if (err) 2028 goto out3; 2029 2030 err = nfs_init_writepagecache(); 2031 if (err) 2032 goto out2; 2033 2034 err = nfs_init_directcache(); 2035 if (err) 2036 goto out1; 2037 2038#ifdef CONFIG_PROC_FS 2039 rpc_proc_register(&init_net, &nfs_rpcstat); 2040#endif 2041 if ((err = register_nfs_fs()) != 0) 2042 goto out0; 2043 2044 return 0; 2045out0: 2046#ifdef CONFIG_PROC_FS 2047 rpc_proc_unregister(&init_net, "nfs"); 2048#endif 2049 nfs_destroy_directcache(); 2050out1: 2051 nfs_destroy_writepagecache(); 2052out2: 2053 nfs_destroy_readpagecache(); 2054out3: 2055 nfs_destroy_inodecache(); 2056out4: 2057 nfs_destroy_nfspagecache(); 2058out5: 2059 nfs_fs_proc_exit(); 2060out6: 2061 nfsiod_stop(); 2062out7: 2063 nfs_fscache_unregister(); 2064out8: 2065 unregister_pernet_subsys(&nfs_net_ops); 2066out9: 2067 return err; 2068} 2069 2070static void __exit exit_nfs_fs(void) 2071{ 2072 nfs_destroy_directcache(); 2073 nfs_destroy_writepagecache(); 2074 nfs_destroy_readpagecache(); 2075 nfs_destroy_inodecache(); 2076 nfs_destroy_nfspagecache(); 2077 nfs_fscache_unregister(); 2078 unregister_pernet_subsys(&nfs_net_ops); 2079#ifdef CONFIG_PROC_FS 2080 rpc_proc_unregister(&init_net, "nfs"); 2081#endif 2082 unregister_nfs_fs(); 2083 nfs_fs_proc_exit(); 2084 nfsiod_stop(); 2085} 2086 2087/* Not quite true; I just maintain it */ 2088MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2089MODULE_LICENSE("GPL"); 2090module_param(enable_ino64, bool, 0644); 2091 2092module_init(init_nfs_fs) 2093module_exit(exit_nfs_fs) 2094