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/nfs_idmap.h> 36 #include <linux/vfs.h> 37 #include <linux/inet.h> 38 #include <linux/nfs_xdr.h> 39 #include <linux/slab.h> 40 41 #include <asm/system.h> 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 "dns_resolve.h" 51 #include "pnfs.h" 52 53 #define NFSDBG_FACILITY NFSDBG_VFS 54 55 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 56 57 /* Default is to see 64-bit inode numbers */ 58 static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 59 60 static void nfs_invalidate_inode(struct inode *); 61 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 62 63 static struct kmem_cache * nfs_inode_cachep; 64 65 static inline unsigned long 66 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 67 { 68 return nfs_fileid_to_ino_t(fattr->fileid); 69 } 70 71 /** 72 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks 73 * @word: long word containing the bit lock 74 */ 75 int nfs_wait_bit_killable(void *word) 76 { 77 if (fatal_signal_pending(current)) 78 return -ERESTARTSYS; 79 schedule(); 80 return 0; 81 } 82 83 /** 84 * nfs_compat_user_ino64 - returns the user-visible inode number 85 * @fileid: 64-bit fileid 86 * 87 * This function returns a 32-bit inode number if the boot parameter 88 * nfs.enable_ino64 is zero. 89 */ 90 u64 nfs_compat_user_ino64(u64 fileid) 91 { 92 int ino; 93 94 if (enable_ino64) 95 return fileid; 96 ino = fileid; 97 if (sizeof(ino) < sizeof(fileid)) 98 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 99 return ino; 100 } 101 102 static void nfs_clear_inode(struct inode *inode) 103 { 104 /* 105 * The following should never happen... 106 */ 107 BUG_ON(nfs_have_writebacks(inode)); 108 BUG_ON(!list_empty(&NFS_I(inode)->open_files)); 109 nfs_zap_acl_cache(inode); 110 nfs_access_zap_cache(inode); 111 nfs_fscache_release_inode_cookie(inode); 112 } 113 114 void nfs_evict_inode(struct inode *inode) 115 { 116 truncate_inode_pages(&inode->i_data, 0); 117 end_writeback(inode); 118 nfs_clear_inode(inode); 119 } 120 121 /** 122 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 123 */ 124 int nfs_sync_mapping(struct address_space *mapping) 125 { 126 int ret = 0; 127 128 if (mapping->nrpages != 0) { 129 unmap_mapping_range(mapping, 0, 0, 0); 130 ret = nfs_wb_all(mapping->host); 131 } 132 return ret; 133 } 134 135 /* 136 * Invalidate the local caches 137 */ 138 static void nfs_zap_caches_locked(struct inode *inode) 139 { 140 struct nfs_inode *nfsi = NFS_I(inode); 141 int mode = inode->i_mode; 142 143 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 144 145 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 146 nfsi->attrtimeo_timestamp = jiffies; 147 148 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 149 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 150 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 151 else 152 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 153 } 154 155 void nfs_zap_caches(struct inode *inode) 156 { 157 spin_lock(&inode->i_lock); 158 nfs_zap_caches_locked(inode); 159 spin_unlock(&inode->i_lock); 160 } 161 162 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 163 { 164 if (mapping->nrpages != 0) { 165 spin_lock(&inode->i_lock); 166 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 167 spin_unlock(&inode->i_lock); 168 } 169 } 170 171 void nfs_zap_acl_cache(struct inode *inode) 172 { 173 void (*clear_acl_cache)(struct inode *); 174 175 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 176 if (clear_acl_cache != NULL) 177 clear_acl_cache(inode); 178 spin_lock(&inode->i_lock); 179 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 180 spin_unlock(&inode->i_lock); 181 } 182 183 void nfs_invalidate_atime(struct inode *inode) 184 { 185 spin_lock(&inode->i_lock); 186 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; 187 spin_unlock(&inode->i_lock); 188 } 189 190 /* 191 * Invalidate, but do not unhash, the inode. 192 * NB: must be called with inode->i_lock held! 193 */ 194 static void nfs_invalidate_inode(struct inode *inode) 195 { 196 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 197 nfs_zap_caches_locked(inode); 198 } 199 200 struct nfs_find_desc { 201 struct nfs_fh *fh; 202 struct nfs_fattr *fattr; 203 }; 204 205 /* 206 * In NFSv3 we can have 64bit inode numbers. In order to support 207 * this, and re-exported directories (also seen in NFSv2) 208 * we are forced to allow 2 different inodes to have the same 209 * i_ino. 210 */ 211 static int 212 nfs_find_actor(struct inode *inode, void *opaque) 213 { 214 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 215 struct nfs_fh *fh = desc->fh; 216 struct nfs_fattr *fattr = desc->fattr; 217 218 if (NFS_FILEID(inode) != fattr->fileid) 219 return 0; 220 if (nfs_compare_fh(NFS_FH(inode), fh)) 221 return 0; 222 if (is_bad_inode(inode) || NFS_STALE(inode)) 223 return 0; 224 return 1; 225 } 226 227 static int 228 nfs_init_locked(struct inode *inode, void *opaque) 229 { 230 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 231 struct nfs_fattr *fattr = desc->fattr; 232 233 set_nfs_fileid(inode, fattr->fileid); 234 nfs_copy_fh(NFS_FH(inode), desc->fh); 235 return 0; 236 } 237 238 /* 239 * This is our front-end to iget that looks up inodes by file handle 240 * instead of inode number. 241 */ 242 struct inode * 243 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 244 { 245 struct nfs_find_desc desc = { 246 .fh = fh, 247 .fattr = fattr 248 }; 249 struct inode *inode = ERR_PTR(-ENOENT); 250 unsigned long hash; 251 252 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) 253 goto out_no_inode; 254 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 255 goto out_no_inode; 256 257 hash = nfs_fattr_to_ino_t(fattr); 258 259 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 260 if (inode == NULL) { 261 inode = ERR_PTR(-ENOMEM); 262 goto out_no_inode; 263 } 264 265 if (inode->i_state & I_NEW) { 266 struct nfs_inode *nfsi = NFS_I(inode); 267 unsigned long now = jiffies; 268 269 /* We set i_ino for the few things that still rely on it, 270 * such as stat(2) */ 271 inode->i_ino = hash; 272 273 /* We can't support update_atime(), since the server will reset it */ 274 inode->i_flags |= S_NOATIME|S_NOCMTIME; 275 inode->i_mode = fattr->mode; 276 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 277 && nfs_server_capable(inode, NFS_CAP_MODE)) 278 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 279 | NFS_INO_INVALID_ACCESS 280 | NFS_INO_INVALID_ACL; 281 /* Why so? Because we want revalidate for devices/FIFOs, and 282 * that's precisely what we have in nfs_file_inode_operations. 283 */ 284 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 285 if (S_ISREG(inode->i_mode)) { 286 inode->i_fop = &nfs_file_operations; 287 inode->i_data.a_ops = &nfs_file_aops; 288 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 289 } else if (S_ISDIR(inode->i_mode)) { 290 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 291 inode->i_fop = &nfs_dir_operations; 292 inode->i_data.a_ops = &nfs_dir_aops; 293 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)) 294 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 295 /* Deal with crossing mountpoints */ 296 if ((fattr->valid & NFS_ATTR_FATTR_FSID) 297 && !nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { 298 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 299 inode->i_op = &nfs_referral_inode_operations; 300 else 301 inode->i_op = &nfs_mountpoint_inode_operations; 302 inode->i_fop = NULL; 303 inode->i_flags |= S_AUTOMOUNT; 304 } 305 } else if (S_ISLNK(inode->i_mode)) 306 inode->i_op = &nfs_symlink_inode_operations; 307 else 308 init_special_inode(inode, inode->i_mode, fattr->rdev); 309 310 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 311 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 312 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 313 nfsi->change_attr = 0; 314 inode->i_size = 0; 315 inode->i_nlink = 0; 316 inode->i_uid = -2; 317 inode->i_gid = -2; 318 inode->i_blocks = 0; 319 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 320 321 nfsi->read_cache_jiffies = fattr->time_start; 322 nfsi->attr_gencount = fattr->gencount; 323 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 324 inode->i_atime = fattr->atime; 325 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 326 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 327 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 328 inode->i_mtime = fattr->mtime; 329 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 330 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 331 | NFS_INO_INVALID_DATA; 332 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 333 inode->i_ctime = fattr->ctime; 334 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 335 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 336 | NFS_INO_INVALID_ACCESS 337 | NFS_INO_INVALID_ACL; 338 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 339 nfsi->change_attr = fattr->change_attr; 340 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) 341 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 342 | NFS_INO_INVALID_DATA; 343 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 344 inode->i_size = nfs_size_to_loff_t(fattr->size); 345 else 346 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 347 | NFS_INO_INVALID_DATA 348 | NFS_INO_REVAL_PAGECACHE; 349 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 350 inode->i_nlink = fattr->nlink; 351 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 352 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 353 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 354 inode->i_uid = fattr->uid; 355 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 356 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 357 | NFS_INO_INVALID_ACCESS 358 | NFS_INO_INVALID_ACL; 359 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 360 inode->i_gid = fattr->gid; 361 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 362 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 363 | NFS_INO_INVALID_ACCESS 364 | NFS_INO_INVALID_ACL; 365 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 366 inode->i_blocks = fattr->du.nfs2.blocks; 367 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 368 /* 369 * report the blocks in 512byte units 370 */ 371 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 372 } 373 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 374 nfsi->attrtimeo_timestamp = now; 375 nfsi->access_cache = RB_ROOT; 376 377 nfs_fscache_init_inode_cookie(inode); 378 379 unlock_new_inode(inode); 380 } else 381 nfs_refresh_inode(inode, fattr); 382 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 383 inode->i_sb->s_id, 384 (long long)NFS_FILEID(inode), 385 atomic_read(&inode->i_count)); 386 387 out: 388 return inode; 389 390 out_no_inode: 391 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 392 goto out; 393 } 394 395 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE) 396 397 int 398 nfs_setattr(struct dentry *dentry, struct iattr *attr) 399 { 400 struct inode *inode = dentry->d_inode; 401 struct nfs_fattr *fattr; 402 int error = -ENOMEM; 403 404 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 405 406 /* skip mode change if it's just for clearing setuid/setgid */ 407 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 408 attr->ia_valid &= ~ATTR_MODE; 409 410 if (attr->ia_valid & ATTR_SIZE) { 411 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 412 attr->ia_valid &= ~ATTR_SIZE; 413 } 414 415 /* Optimization: if the end result is no change, don't RPC */ 416 attr->ia_valid &= NFS_VALID_ATTRS; 417 if ((attr->ia_valid & ~ATTR_FILE) == 0) 418 return 0; 419 420 /* Write all dirty data */ 421 if (S_ISREG(inode->i_mode)) 422 nfs_wb_all(inode); 423 424 fattr = nfs_alloc_fattr(); 425 if (fattr == NULL) 426 goto out; 427 /* 428 * Return any delegations if we're going to change ACLs 429 */ 430 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 431 nfs_inode_return_delegation(inode); 432 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 433 if (error == 0) 434 nfs_refresh_inode(inode, fattr); 435 nfs_free_fattr(fattr); 436 out: 437 return error; 438 } 439 440 /** 441 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 442 * @inode: inode of the file used 443 * @offset: file offset to start truncating 444 * 445 * This is a copy of the common vmtruncate, but with the locking 446 * corrected to take into account the fact that NFS requires 447 * inode->i_size to be updated under the inode->i_lock. 448 */ 449 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 450 { 451 loff_t oldsize; 452 int err; 453 454 err = inode_newsize_ok(inode, offset); 455 if (err) 456 goto out; 457 458 spin_lock(&inode->i_lock); 459 oldsize = inode->i_size; 460 i_size_write(inode, offset); 461 spin_unlock(&inode->i_lock); 462 463 truncate_pagecache(inode, oldsize, offset); 464 out: 465 return err; 466 } 467 468 /** 469 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 470 * @inode: pointer to struct inode 471 * @attr: pointer to struct iattr 472 * 473 * Note: we do this in the *proc.c in order to ensure that 474 * it works for things like exclusive creates too. 475 */ 476 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 477 { 478 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 479 spin_lock(&inode->i_lock); 480 if ((attr->ia_valid & ATTR_MODE) != 0) { 481 int mode = attr->ia_mode & S_IALLUGO; 482 mode |= inode->i_mode & ~S_IALLUGO; 483 inode->i_mode = mode; 484 } 485 if ((attr->ia_valid & ATTR_UID) != 0) 486 inode->i_uid = attr->ia_uid; 487 if ((attr->ia_valid & ATTR_GID) != 0) 488 inode->i_gid = attr->ia_gid; 489 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 490 spin_unlock(&inode->i_lock); 491 } 492 if ((attr->ia_valid & ATTR_SIZE) != 0) { 493 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 494 nfs_vmtruncate(inode, attr->ia_size); 495 } 496 } 497 498 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 499 { 500 struct inode *inode = dentry->d_inode; 501 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 502 int err; 503 504 /* Flush out writes to the server in order to update c/mtime. */ 505 if (S_ISREG(inode->i_mode)) { 506 err = filemap_write_and_wait(inode->i_mapping); 507 if (err) 508 goto out; 509 } 510 511 /* 512 * We may force a getattr if the user cares about atime. 513 * 514 * Note that we only have to check the vfsmount flags here: 515 * - NFS always sets S_NOATIME by so checking it would give a 516 * bogus result 517 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 518 * no point in checking those. 519 */ 520 if ((mnt->mnt_flags & MNT_NOATIME) || 521 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 522 need_atime = 0; 523 524 if (need_atime) 525 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 526 else 527 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 528 if (!err) { 529 generic_fillattr(inode, stat); 530 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 531 } 532 out: 533 return err; 534 } 535 536 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 537 { 538 atomic_set(&l_ctx->count, 1); 539 l_ctx->lockowner = current->files; 540 l_ctx->pid = current->tgid; 541 INIT_LIST_HEAD(&l_ctx->list); 542 } 543 544 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 545 { 546 struct nfs_lock_context *pos; 547 548 list_for_each_entry(pos, &ctx->lock_context.list, list) { 549 if (pos->lockowner != current->files) 550 continue; 551 if (pos->pid != current->tgid) 552 continue; 553 atomic_inc(&pos->count); 554 return pos; 555 } 556 return NULL; 557 } 558 559 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 560 { 561 struct nfs_lock_context *res, *new = NULL; 562 struct inode *inode = ctx->path.dentry->d_inode; 563 564 spin_lock(&inode->i_lock); 565 res = __nfs_find_lock_context(ctx); 566 if (res == NULL) { 567 spin_unlock(&inode->i_lock); 568 new = kmalloc(sizeof(*new), GFP_KERNEL); 569 if (new == NULL) 570 return NULL; 571 nfs_init_lock_context(new); 572 spin_lock(&inode->i_lock); 573 res = __nfs_find_lock_context(ctx); 574 if (res == NULL) { 575 list_add_tail(&new->list, &ctx->lock_context.list); 576 new->open_context = ctx; 577 res = new; 578 new = NULL; 579 } 580 } 581 spin_unlock(&inode->i_lock); 582 kfree(new); 583 return res; 584 } 585 586 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 587 { 588 struct nfs_open_context *ctx = l_ctx->open_context; 589 struct inode *inode = ctx->path.dentry->d_inode; 590 591 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 592 return; 593 list_del(&l_ctx->list); 594 spin_unlock(&inode->i_lock); 595 kfree(l_ctx); 596 } 597 598 /** 599 * nfs_close_context - Common close_context() routine NFSv2/v3 600 * @ctx: pointer to context 601 * @is_sync: is this a synchronous close 602 * 603 * always ensure that the attributes are up to date if we're mounted 604 * with close-to-open semantics 605 */ 606 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 607 { 608 struct inode *inode; 609 struct nfs_server *server; 610 611 if (!(ctx->mode & FMODE_WRITE)) 612 return; 613 if (!is_sync) 614 return; 615 inode = ctx->path.dentry->d_inode; 616 if (!list_empty(&NFS_I(inode)->open_files)) 617 return; 618 server = NFS_SERVER(inode); 619 if (server->flags & NFS_MOUNT_NOCTO) 620 return; 621 nfs_revalidate_inode(server, inode); 622 } 623 624 struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred, fmode_t f_mode) 625 { 626 struct nfs_open_context *ctx; 627 628 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 629 if (ctx != NULL) { 630 ctx->path = *path; 631 path_get(&ctx->path); 632 ctx->cred = get_rpccred(cred); 633 ctx->state = NULL; 634 ctx->mode = f_mode; 635 ctx->flags = 0; 636 ctx->error = 0; 637 ctx->dir_cookie = 0; 638 nfs_init_lock_context(&ctx->lock_context); 639 ctx->lock_context.open_context = ctx; 640 INIT_LIST_HEAD(&ctx->list); 641 } 642 return ctx; 643 } 644 645 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 646 { 647 if (ctx != NULL) 648 atomic_inc(&ctx->lock_context.count); 649 return ctx; 650 } 651 652 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 653 { 654 struct inode *inode = ctx->path.dentry->d_inode; 655 656 if (!list_empty(&ctx->list)) { 657 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 658 return; 659 list_del(&ctx->list); 660 spin_unlock(&inode->i_lock); 661 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 662 return; 663 if (inode != NULL) 664 NFS_PROTO(inode)->close_context(ctx, is_sync); 665 if (ctx->cred != NULL) 666 put_rpccred(ctx->cred); 667 path_put(&ctx->path); 668 kfree(ctx); 669 } 670 671 void put_nfs_open_context(struct nfs_open_context *ctx) 672 { 673 __put_nfs_open_context(ctx, 0); 674 } 675 676 /* 677 * Ensure that mmap has a recent RPC credential for use when writing out 678 * shared pages 679 */ 680 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 681 { 682 struct inode *inode = filp->f_path.dentry->d_inode; 683 struct nfs_inode *nfsi = NFS_I(inode); 684 685 filp->private_data = get_nfs_open_context(ctx); 686 spin_lock(&inode->i_lock); 687 list_add(&ctx->list, &nfsi->open_files); 688 spin_unlock(&inode->i_lock); 689 } 690 691 /* 692 * Given an inode, search for an open context with the desired characteristics 693 */ 694 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 695 { 696 struct nfs_inode *nfsi = NFS_I(inode); 697 struct nfs_open_context *pos, *ctx = NULL; 698 699 spin_lock(&inode->i_lock); 700 list_for_each_entry(pos, &nfsi->open_files, list) { 701 if (cred != NULL && pos->cred != cred) 702 continue; 703 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 704 continue; 705 ctx = get_nfs_open_context(pos); 706 break; 707 } 708 spin_unlock(&inode->i_lock); 709 return ctx; 710 } 711 712 static void nfs_file_clear_open_context(struct file *filp) 713 { 714 struct inode *inode = filp->f_path.dentry->d_inode; 715 struct nfs_open_context *ctx = nfs_file_open_context(filp); 716 717 if (ctx) { 718 filp->private_data = NULL; 719 spin_lock(&inode->i_lock); 720 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 721 spin_unlock(&inode->i_lock); 722 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 723 } 724 } 725 726 /* 727 * These allocate and release file read/write context information. 728 */ 729 int nfs_open(struct inode *inode, struct file *filp) 730 { 731 struct nfs_open_context *ctx; 732 struct rpc_cred *cred; 733 734 cred = rpc_lookup_cred(); 735 if (IS_ERR(cred)) 736 return PTR_ERR(cred); 737 ctx = alloc_nfs_open_context(&filp->f_path, cred, filp->f_mode); 738 put_rpccred(cred); 739 if (ctx == NULL) 740 return -ENOMEM; 741 nfs_file_set_open_context(filp, ctx); 742 put_nfs_open_context(ctx); 743 nfs_fscache_set_inode_cookie(inode, filp); 744 return 0; 745 } 746 747 int nfs_release(struct inode *inode, struct file *filp) 748 { 749 nfs_file_clear_open_context(filp); 750 return 0; 751 } 752 753 /* 754 * This function is called whenever some part of NFS notices that 755 * the cached attributes have to be refreshed. 756 */ 757 int 758 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 759 { 760 int status = -ESTALE; 761 struct nfs_fattr *fattr = NULL; 762 struct nfs_inode *nfsi = NFS_I(inode); 763 764 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 765 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 766 767 if (is_bad_inode(inode)) 768 goto out; 769 if (NFS_STALE(inode)) 770 goto out; 771 772 status = -ENOMEM; 773 fattr = nfs_alloc_fattr(); 774 if (fattr == NULL) 775 goto out; 776 777 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 778 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr); 779 if (status != 0) { 780 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 781 inode->i_sb->s_id, 782 (long long)NFS_FILEID(inode), status); 783 if (status == -ESTALE) { 784 nfs_zap_caches(inode); 785 if (!S_ISDIR(inode->i_mode)) 786 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 787 } 788 goto out; 789 } 790 791 status = nfs_refresh_inode(inode, fattr); 792 if (status) { 793 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 794 inode->i_sb->s_id, 795 (long long)NFS_FILEID(inode), status); 796 goto out; 797 } 798 799 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 800 nfs_zap_acl_cache(inode); 801 802 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 803 inode->i_sb->s_id, 804 (long long)NFS_FILEID(inode)); 805 806 out: 807 nfs_free_fattr(fattr); 808 return status; 809 } 810 811 int nfs_attribute_timeout(struct inode *inode) 812 { 813 struct nfs_inode *nfsi = NFS_I(inode); 814 815 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 816 } 817 818 static int nfs_attribute_cache_expired(struct inode *inode) 819 { 820 if (nfs_have_delegated_attributes(inode)) 821 return 0; 822 return nfs_attribute_timeout(inode); 823 } 824 825 /** 826 * nfs_revalidate_inode - Revalidate the inode attributes 827 * @server - pointer to nfs_server struct 828 * @inode - pointer to inode struct 829 * 830 * Updates inode attribute information by retrieving the data from the server. 831 */ 832 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 833 { 834 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) 835 && !nfs_attribute_cache_expired(inode)) 836 return NFS_STALE(inode) ? -ESTALE : 0; 837 return __nfs_revalidate_inode(server, inode); 838 } 839 840 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 841 { 842 struct nfs_inode *nfsi = NFS_I(inode); 843 844 if (mapping->nrpages != 0) { 845 int ret = invalidate_inode_pages2(mapping); 846 if (ret < 0) 847 return ret; 848 } 849 spin_lock(&inode->i_lock); 850 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 851 if (S_ISDIR(inode->i_mode)) 852 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 853 spin_unlock(&inode->i_lock); 854 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 855 nfs_fscache_reset_inode_cookie(inode); 856 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 857 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 858 return 0; 859 } 860 861 /** 862 * nfs_revalidate_mapping - Revalidate the pagecache 863 * @inode - pointer to host inode 864 * @mapping - pointer to mapping 865 */ 866 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 867 { 868 struct nfs_inode *nfsi = NFS_I(inode); 869 int ret = 0; 870 871 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 872 || nfs_attribute_cache_expired(inode) 873 || NFS_STALE(inode)) { 874 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 875 if (ret < 0) 876 goto out; 877 } 878 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 879 ret = nfs_invalidate_mapping(inode, mapping); 880 out: 881 return ret; 882 } 883 884 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 885 { 886 struct nfs_inode *nfsi = NFS_I(inode); 887 unsigned long ret = 0; 888 889 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 890 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 891 && nfsi->change_attr == fattr->pre_change_attr) { 892 nfsi->change_attr = fattr->change_attr; 893 if (S_ISDIR(inode->i_mode)) 894 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 895 ret |= NFS_INO_INVALID_ATTR; 896 } 897 /* If we have atomic WCC data, we may update some attributes */ 898 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 899 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 900 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 901 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 902 ret |= NFS_INO_INVALID_ATTR; 903 } 904 905 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 906 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 907 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 908 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 909 if (S_ISDIR(inode->i_mode)) 910 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 911 ret |= NFS_INO_INVALID_ATTR; 912 } 913 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 914 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 915 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 916 && nfsi->npages == 0) { 917 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 918 ret |= NFS_INO_INVALID_ATTR; 919 } 920 return ret; 921 } 922 923 /** 924 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 925 * @inode - pointer to inode 926 * @fattr - updated attributes 927 * 928 * Verifies the attribute cache. If we have just changed the attributes, 929 * so that fattr carries weak cache consistency data, then it may 930 * also update the ctime/mtime/change_attribute. 931 */ 932 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 933 { 934 struct nfs_inode *nfsi = NFS_I(inode); 935 loff_t cur_size, new_isize; 936 unsigned long invalid = 0; 937 938 939 /* Has the inode gone and changed behind our back? */ 940 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 941 return -EIO; 942 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 943 return -EIO; 944 945 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 946 nfsi->change_attr != fattr->change_attr) 947 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 948 949 /* Verify a few of the more important attributes */ 950 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 951 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 952 953 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 954 cur_size = i_size_read(inode); 955 new_isize = nfs_size_to_loff_t(fattr->size); 956 if (cur_size != new_isize && nfsi->npages == 0) 957 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 958 } 959 960 /* Have any file permissions changed? */ 961 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 962 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 963 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid) 964 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 965 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid) 966 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 967 968 /* Has the link count changed? */ 969 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 970 invalid |= NFS_INO_INVALID_ATTR; 971 972 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 973 invalid |= NFS_INO_INVALID_ATIME; 974 975 if (invalid != 0) 976 nfsi->cache_validity |= invalid; 977 978 nfsi->read_cache_jiffies = fattr->time_start; 979 return 0; 980 } 981 982 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 983 { 984 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 985 return 0; 986 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 987 } 988 989 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 990 { 991 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 992 return 0; 993 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 994 } 995 996 static atomic_long_t nfs_attr_generation_counter; 997 998 static unsigned long nfs_read_attr_generation_counter(void) 999 { 1000 return atomic_long_read(&nfs_attr_generation_counter); 1001 } 1002 1003 unsigned long nfs_inc_attr_generation_counter(void) 1004 { 1005 return atomic_long_inc_return(&nfs_attr_generation_counter); 1006 } 1007 1008 void nfs_fattr_init(struct nfs_fattr *fattr) 1009 { 1010 fattr->valid = 0; 1011 fattr->time_start = jiffies; 1012 fattr->gencount = nfs_inc_attr_generation_counter(); 1013 } 1014 1015 struct nfs_fattr *nfs_alloc_fattr(void) 1016 { 1017 struct nfs_fattr *fattr; 1018 1019 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1020 if (fattr != NULL) 1021 nfs_fattr_init(fattr); 1022 return fattr; 1023 } 1024 1025 struct nfs_fh *nfs_alloc_fhandle(void) 1026 { 1027 struct nfs_fh *fh; 1028 1029 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1030 if (fh != NULL) 1031 fh->size = 0; 1032 return fh; 1033 } 1034 1035 /** 1036 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1037 * @inode - pointer to inode 1038 * @fattr - attributes 1039 * 1040 * Attempt to divine whether or not an RPC call reply carrying stale 1041 * attributes got scheduled after another call carrying updated ones. 1042 * 1043 * To do so, the function first assumes that a more recent ctime means 1044 * that the attributes in fattr are newer, however it also attempt to 1045 * catch the case where ctime either didn't change, or went backwards 1046 * (if someone reset the clock on the server) by looking at whether 1047 * or not this RPC call was started after the inode was last updated. 1048 * Note also the check for wraparound of 'attr_gencount' 1049 * 1050 * The function returns 'true' if it thinks the attributes in 'fattr' are 1051 * more recent than the ones cached in the inode. 1052 * 1053 */ 1054 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1055 { 1056 const struct nfs_inode *nfsi = NFS_I(inode); 1057 1058 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1059 nfs_ctime_need_update(inode, fattr) || 1060 nfs_size_need_update(inode, fattr) || 1061 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1062 } 1063 1064 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1065 { 1066 if (nfs_inode_attrs_need_update(inode, fattr)) 1067 return nfs_update_inode(inode, fattr); 1068 return nfs_check_inode_attributes(inode, fattr); 1069 } 1070 1071 /** 1072 * nfs_refresh_inode - try to update the inode attribute cache 1073 * @inode - pointer to inode 1074 * @fattr - updated attributes 1075 * 1076 * Check that an RPC call that returned attributes has not overlapped with 1077 * other recent updates of the inode metadata, then decide whether it is 1078 * safe to do a full update of the inode attributes, or whether just to 1079 * call nfs_check_inode_attributes. 1080 */ 1081 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1082 { 1083 int status; 1084 1085 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1086 return 0; 1087 spin_lock(&inode->i_lock); 1088 status = nfs_refresh_inode_locked(inode, fattr); 1089 spin_unlock(&inode->i_lock); 1090 1091 return status; 1092 } 1093 1094 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1095 { 1096 struct nfs_inode *nfsi = NFS_I(inode); 1097 1098 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1099 if (S_ISDIR(inode->i_mode)) 1100 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1101 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1102 return 0; 1103 return nfs_refresh_inode_locked(inode, fattr); 1104 } 1105 1106 /** 1107 * nfs_post_op_update_inode - try to update the inode attribute cache 1108 * @inode - pointer to inode 1109 * @fattr - updated attributes 1110 * 1111 * After an operation that has changed the inode metadata, mark the 1112 * attribute cache as being invalid, then try to update it. 1113 * 1114 * NB: if the server didn't return any post op attributes, this 1115 * function will force the retrieval of attributes before the next 1116 * NFS request. Thus it should be used only for operations that 1117 * are expected to change one or more attributes, to avoid 1118 * unnecessary NFS requests and trips through nfs_update_inode(). 1119 */ 1120 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1121 { 1122 int status; 1123 1124 spin_lock(&inode->i_lock); 1125 status = nfs_post_op_update_inode_locked(inode, fattr); 1126 spin_unlock(&inode->i_lock); 1127 return status; 1128 } 1129 1130 /** 1131 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1132 * @inode - pointer to inode 1133 * @fattr - updated attributes 1134 * 1135 * After an operation that has changed the inode metadata, mark the 1136 * attribute cache as being invalid, then try to update it. Fake up 1137 * weak cache consistency data, if none exist. 1138 * 1139 * This function is mainly designed to be used by the ->write_done() functions. 1140 */ 1141 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1142 { 1143 int status; 1144 1145 spin_lock(&inode->i_lock); 1146 /* Don't do a WCC update if these attributes are already stale */ 1147 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1148 !nfs_inode_attrs_need_update(inode, fattr)) { 1149 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1150 | NFS_ATTR_FATTR_PRESIZE 1151 | NFS_ATTR_FATTR_PREMTIME 1152 | NFS_ATTR_FATTR_PRECTIME); 1153 goto out_noforce; 1154 } 1155 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1156 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1157 fattr->pre_change_attr = NFS_I(inode)->change_attr; 1158 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1159 } 1160 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1161 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1162 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1163 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1164 } 1165 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1166 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1167 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1168 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1169 } 1170 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1171 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1172 fattr->pre_size = i_size_read(inode); 1173 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1174 } 1175 out_noforce: 1176 status = nfs_post_op_update_inode_locked(inode, fattr); 1177 spin_unlock(&inode->i_lock); 1178 return status; 1179 } 1180 1181 /* 1182 * Many nfs protocol calls return the new file attributes after 1183 * an operation. Here we update the inode to reflect the state 1184 * of the server's inode. 1185 * 1186 * This is a bit tricky because we have to make sure all dirty pages 1187 * have been sent off to the server before calling invalidate_inode_pages. 1188 * To make sure no other process adds more write requests while we try 1189 * our best to flush them, we make them sleep during the attribute refresh. 1190 * 1191 * A very similar scenario holds for the dir cache. 1192 */ 1193 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1194 { 1195 struct nfs_server *server; 1196 struct nfs_inode *nfsi = NFS_I(inode); 1197 loff_t cur_isize, new_isize; 1198 unsigned long invalid = 0; 1199 unsigned long now = jiffies; 1200 unsigned long save_cache_validity; 1201 1202 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 1203 __func__, inode->i_sb->s_id, inode->i_ino, 1204 atomic_read(&inode->i_count), fattr->valid); 1205 1206 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1207 goto out_fileid; 1208 1209 /* 1210 * Make sure the inode's type hasn't changed. 1211 */ 1212 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1213 goto out_changed; 1214 1215 server = NFS_SERVER(inode); 1216 /* Update the fsid? */ 1217 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1218 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1219 !IS_AUTOMOUNT(inode)) 1220 server->fsid = fattr->fsid; 1221 1222 /* 1223 * Update the read time so we don't revalidate too often. 1224 */ 1225 nfsi->read_cache_jiffies = fattr->time_start; 1226 1227 save_cache_validity = nfsi->cache_validity; 1228 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1229 | NFS_INO_INVALID_ATIME 1230 | NFS_INO_REVAL_FORCED 1231 | NFS_INO_REVAL_PAGECACHE); 1232 1233 /* Do atomic weak cache consistency updates */ 1234 invalid |= nfs_wcc_update_inode(inode, fattr); 1235 1236 /* More cache consistency checks */ 1237 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1238 if (nfsi->change_attr != fattr->change_attr) { 1239 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1240 inode->i_sb->s_id, inode->i_ino); 1241 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1242 if (S_ISDIR(inode->i_mode)) 1243 nfs_force_lookup_revalidate(inode); 1244 nfsi->change_attr = fattr->change_attr; 1245 } 1246 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1247 invalid |= save_cache_validity; 1248 1249 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1250 /* NFSv2/v3: Check if the mtime agrees */ 1251 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1252 dprintk("NFS: mtime change on server for file %s/%ld\n", 1253 inode->i_sb->s_id, inode->i_ino); 1254 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1255 if (S_ISDIR(inode->i_mode)) 1256 nfs_force_lookup_revalidate(inode); 1257 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1258 } 1259 } else if (server->caps & NFS_CAP_MTIME) 1260 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1261 | NFS_INO_INVALID_DATA 1262 | NFS_INO_REVAL_PAGECACHE 1263 | NFS_INO_REVAL_FORCED); 1264 1265 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1266 /* If ctime has changed we should definitely clear access+acl caches */ 1267 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { 1268 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1269 /* and probably clear data for a directory too as utimes can cause 1270 * havoc with our cache. 1271 */ 1272 if (S_ISDIR(inode->i_mode)) { 1273 invalid |= NFS_INO_INVALID_DATA; 1274 nfs_force_lookup_revalidate(inode); 1275 } 1276 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1277 } 1278 } else if (server->caps & NFS_CAP_CTIME) 1279 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1280 | NFS_INO_INVALID_ACCESS 1281 | NFS_INO_INVALID_ACL 1282 | NFS_INO_REVAL_FORCED); 1283 1284 /* Check if our cached file size is stale */ 1285 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1286 new_isize = nfs_size_to_loff_t(fattr->size); 1287 cur_isize = i_size_read(inode); 1288 if (new_isize != cur_isize) { 1289 /* Do we perhaps have any outstanding writes, or has 1290 * the file grown beyond our last write? */ 1291 if (nfsi->npages == 0 || new_isize > cur_isize) { 1292 i_size_write(inode, new_isize); 1293 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1294 } 1295 dprintk("NFS: isize change on server for file %s/%ld\n", 1296 inode->i_sb->s_id, inode->i_ino); 1297 } 1298 } else 1299 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1300 | NFS_INO_REVAL_PAGECACHE 1301 | NFS_INO_REVAL_FORCED); 1302 1303 1304 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1305 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1306 else if (server->caps & NFS_CAP_ATIME) 1307 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME 1308 | NFS_INO_REVAL_FORCED); 1309 1310 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1311 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1312 umode_t newmode = inode->i_mode & S_IFMT; 1313 newmode |= fattr->mode & S_IALLUGO; 1314 inode->i_mode = newmode; 1315 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1316 } 1317 } else if (server->caps & NFS_CAP_MODE) 1318 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1319 | NFS_INO_INVALID_ACCESS 1320 | NFS_INO_INVALID_ACL 1321 | NFS_INO_REVAL_FORCED); 1322 1323 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1324 if (inode->i_uid != fattr->uid) { 1325 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1326 inode->i_uid = fattr->uid; 1327 } 1328 } else if (server->caps & NFS_CAP_OWNER) 1329 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1330 | NFS_INO_INVALID_ACCESS 1331 | NFS_INO_INVALID_ACL 1332 | NFS_INO_REVAL_FORCED); 1333 1334 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1335 if (inode->i_gid != fattr->gid) { 1336 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1337 inode->i_gid = fattr->gid; 1338 } 1339 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1340 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1341 | NFS_INO_INVALID_ACCESS 1342 | NFS_INO_INVALID_ACL 1343 | NFS_INO_REVAL_FORCED); 1344 1345 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1346 if (inode->i_nlink != fattr->nlink) { 1347 invalid |= NFS_INO_INVALID_ATTR; 1348 if (S_ISDIR(inode->i_mode)) 1349 invalid |= NFS_INO_INVALID_DATA; 1350 inode->i_nlink = fattr->nlink; 1351 } 1352 } else if (server->caps & NFS_CAP_NLINK) 1353 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1354 | NFS_INO_REVAL_FORCED); 1355 1356 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1357 /* 1358 * report the blocks in 512byte units 1359 */ 1360 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1361 } 1362 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1363 inode->i_blocks = fattr->du.nfs2.blocks; 1364 1365 /* Update attrtimeo value if we're out of the unstable period */ 1366 if (invalid & NFS_INO_INVALID_ATTR) { 1367 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1368 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1369 nfsi->attrtimeo_timestamp = now; 1370 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1371 } else { 1372 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1373 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1374 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1375 nfsi->attrtimeo_timestamp = now; 1376 } 1377 } 1378 invalid &= ~NFS_INO_INVALID_ATTR; 1379 /* Don't invalidate the data if we were to blame */ 1380 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1381 || S_ISLNK(inode->i_mode))) 1382 invalid &= ~NFS_INO_INVALID_DATA; 1383 if (!nfs_have_delegation(inode, FMODE_READ) || 1384 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1385 nfsi->cache_validity |= invalid; 1386 1387 return 0; 1388 out_changed: 1389 /* 1390 * Big trouble! The inode has become a different object. 1391 */ 1392 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1393 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1394 out_err: 1395 /* 1396 * No need to worry about unhashing the dentry, as the 1397 * lookup validation will know that the inode is bad. 1398 * (But we fall through to invalidate the caches.) 1399 */ 1400 nfs_invalidate_inode(inode); 1401 return -ESTALE; 1402 1403 out_fileid: 1404 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1405 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1406 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, 1407 (long long)nfsi->fileid, (long long)fattr->fileid); 1408 goto out_err; 1409 } 1410 1411 1412 #ifdef CONFIG_NFS_V4 1413 1414 /* 1415 * Clean out any remaining NFSv4 state that might be left over due 1416 * to open() calls that passed nfs_atomic_lookup, but failed to call 1417 * nfs_open(). 1418 */ 1419 void nfs4_evict_inode(struct inode *inode) 1420 { 1421 pnfs_destroy_layout(NFS_I(inode)); 1422 truncate_inode_pages(&inode->i_data, 0); 1423 end_writeback(inode); 1424 /* If we are holding a delegation, return it! */ 1425 nfs_inode_return_delegation_noreclaim(inode); 1426 /* First call standard NFS clear_inode() code */ 1427 nfs_clear_inode(inode); 1428 } 1429 #endif 1430 1431 struct inode *nfs_alloc_inode(struct super_block *sb) 1432 { 1433 struct nfs_inode *nfsi; 1434 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1435 if (!nfsi) 1436 return NULL; 1437 nfsi->flags = 0UL; 1438 nfsi->cache_validity = 0UL; 1439 #ifdef CONFIG_NFS_V3_ACL 1440 nfsi->acl_access = ERR_PTR(-EAGAIN); 1441 nfsi->acl_default = ERR_PTR(-EAGAIN); 1442 #endif 1443 #ifdef CONFIG_NFS_V4 1444 nfsi->nfs4_acl = NULL; 1445 #endif /* CONFIG_NFS_V4 */ 1446 return &nfsi->vfs_inode; 1447 } 1448 1449 static void nfs_i_callback(struct rcu_head *head) 1450 { 1451 struct inode *inode = container_of(head, struct inode, i_rcu); 1452 INIT_LIST_HEAD(&inode->i_dentry); 1453 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1454 } 1455 1456 void nfs_destroy_inode(struct inode *inode) 1457 { 1458 call_rcu(&inode->i_rcu, nfs_i_callback); 1459 } 1460 1461 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1462 { 1463 #ifdef CONFIG_NFS_V4 1464 INIT_LIST_HEAD(&nfsi->open_states); 1465 nfsi->delegation = NULL; 1466 nfsi->delegation_state = 0; 1467 init_rwsem(&nfsi->rwsem); 1468 nfsi->layout = NULL; 1469 #endif 1470 } 1471 1472 static void init_once(void *foo) 1473 { 1474 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1475 1476 inode_init_once(&nfsi->vfs_inode); 1477 INIT_LIST_HEAD(&nfsi->open_files); 1478 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1479 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1480 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1481 nfsi->npages = 0; 1482 nfsi->ncommit = 0; 1483 atomic_set(&nfsi->silly_count, 1); 1484 INIT_HLIST_HEAD(&nfsi->silly_list); 1485 init_waitqueue_head(&nfsi->waitqueue); 1486 nfs4_init_once(nfsi); 1487 } 1488 1489 static int __init nfs_init_inodecache(void) 1490 { 1491 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1492 sizeof(struct nfs_inode), 1493 0, (SLAB_RECLAIM_ACCOUNT| 1494 SLAB_MEM_SPREAD), 1495 init_once); 1496 if (nfs_inode_cachep == NULL) 1497 return -ENOMEM; 1498 1499 return 0; 1500 } 1501 1502 static void nfs_destroy_inodecache(void) 1503 { 1504 kmem_cache_destroy(nfs_inode_cachep); 1505 } 1506 1507 struct workqueue_struct *nfsiod_workqueue; 1508 1509 /* 1510 * start up the nfsiod workqueue 1511 */ 1512 static int nfsiod_start(void) 1513 { 1514 struct workqueue_struct *wq; 1515 dprintk("RPC: creating workqueue nfsiod\n"); 1516 wq = alloc_workqueue("nfsiod", WQ_RESCUER, 0); 1517 if (wq == NULL) 1518 return -ENOMEM; 1519 nfsiod_workqueue = wq; 1520 return 0; 1521 } 1522 1523 /* 1524 * Destroy the nfsiod workqueue 1525 */ 1526 static void nfsiod_stop(void) 1527 { 1528 struct workqueue_struct *wq; 1529 1530 wq = nfsiod_workqueue; 1531 if (wq == NULL) 1532 return; 1533 nfsiod_workqueue = NULL; 1534 destroy_workqueue(wq); 1535 } 1536 1537 /* 1538 * Initialize NFS 1539 */ 1540 static int __init init_nfs_fs(void) 1541 { 1542 int err; 1543 1544 err = nfs_idmap_init(); 1545 if (err < 0) 1546 goto out9; 1547 1548 err = nfs_dns_resolver_init(); 1549 if (err < 0) 1550 goto out8; 1551 1552 err = nfs_fscache_register(); 1553 if (err < 0) 1554 goto out7; 1555 1556 err = nfsiod_start(); 1557 if (err) 1558 goto out6; 1559 1560 err = nfs_fs_proc_init(); 1561 if (err) 1562 goto out5; 1563 1564 err = nfs_init_nfspagecache(); 1565 if (err) 1566 goto out4; 1567 1568 err = nfs_init_inodecache(); 1569 if (err) 1570 goto out3; 1571 1572 err = nfs_init_readpagecache(); 1573 if (err) 1574 goto out2; 1575 1576 err = nfs_init_writepagecache(); 1577 if (err) 1578 goto out1; 1579 1580 err = nfs_init_directcache(); 1581 if (err) 1582 goto out0; 1583 1584 #ifdef CONFIG_PROC_FS 1585 rpc_proc_register(&nfs_rpcstat); 1586 #endif 1587 if ((err = register_nfs_fs()) != 0) 1588 goto out; 1589 return 0; 1590 out: 1591 #ifdef CONFIG_PROC_FS 1592 rpc_proc_unregister("nfs"); 1593 #endif 1594 nfs_destroy_directcache(); 1595 out0: 1596 nfs_destroy_writepagecache(); 1597 out1: 1598 nfs_destroy_readpagecache(); 1599 out2: 1600 nfs_destroy_inodecache(); 1601 out3: 1602 nfs_destroy_nfspagecache(); 1603 out4: 1604 nfs_fs_proc_exit(); 1605 out5: 1606 nfsiod_stop(); 1607 out6: 1608 nfs_fscache_unregister(); 1609 out7: 1610 nfs_dns_resolver_destroy(); 1611 out8: 1612 nfs_idmap_quit(); 1613 out9: 1614 return err; 1615 } 1616 1617 static void __exit exit_nfs_fs(void) 1618 { 1619 nfs_destroy_directcache(); 1620 nfs_destroy_writepagecache(); 1621 nfs_destroy_readpagecache(); 1622 nfs_destroy_inodecache(); 1623 nfs_destroy_nfspagecache(); 1624 nfs_fscache_unregister(); 1625 nfs_dns_resolver_destroy(); 1626 nfs_idmap_quit(); 1627 #ifdef CONFIG_PROC_FS 1628 rpc_proc_unregister("nfs"); 1629 #endif 1630 nfs_cleanup_cb_ident_idr(); 1631 unregister_nfs_fs(); 1632 nfs_fs_proc_exit(); 1633 nfsiod_stop(); 1634 } 1635 1636 /* Not quite true; I just maintain it */ 1637 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1638 MODULE_LICENSE("GPL"); 1639 module_param(enable_ino64, bool, 0644); 1640 1641 module_init(init_nfs_fs) 1642 module_exit(exit_nfs_fs) 1643