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.Cox@linux.org>, 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/smp_lock.h> 34 #include <linux/seq_file.h> 35 #include <linux/mount.h> 36 #include <linux/nfs_idmap.h> 37 #include <linux/vfs.h> 38 #include <linux/inet.h> 39 #include <linux/nfs_xdr.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 50 #define NFSDBG_FACILITY NFSDBG_VFS 51 52 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 53 54 /* Default is to see 64-bit inode numbers */ 55 static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 56 57 static void nfs_invalidate_inode(struct inode *); 58 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 59 60 static void nfs_zap_acl_cache(struct inode *); 61 62 static struct kmem_cache * nfs_inode_cachep; 63 64 static inline unsigned long 65 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 66 { 67 return nfs_fileid_to_ino_t(fattr->fileid); 68 } 69 70 /** 71 * nfs_compat_user_ino64 - returns the user-visible inode number 72 * @fileid: 64-bit fileid 73 * 74 * This function returns a 32-bit inode number if the boot parameter 75 * nfs.enable_ino64 is zero. 76 */ 77 u64 nfs_compat_user_ino64(u64 fileid) 78 { 79 int ino; 80 81 if (enable_ino64) 82 return fileid; 83 ino = fileid; 84 if (sizeof(ino) < sizeof(fileid)) 85 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 86 return ino; 87 } 88 89 int nfs_write_inode(struct inode *inode, int sync) 90 { 91 int ret; 92 93 if (sync) { 94 ret = filemap_fdatawait(inode->i_mapping); 95 if (ret == 0) 96 ret = nfs_commit_inode(inode, FLUSH_SYNC); 97 } else 98 ret = nfs_commit_inode(inode, 0); 99 if (ret >= 0) 100 return 0; 101 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 102 return ret; 103 } 104 105 void nfs_clear_inode(struct inode *inode) 106 { 107 /* 108 * The following should never happen... 109 */ 110 BUG_ON(nfs_have_writebacks(inode)); 111 BUG_ON(!list_empty(&NFS_I(inode)->open_files)); 112 nfs_zap_acl_cache(inode); 113 nfs_access_zap_cache(inode); 114 } 115 116 /** 117 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 118 */ 119 int nfs_sync_mapping(struct address_space *mapping) 120 { 121 int ret; 122 123 if (mapping->nrpages == 0) 124 return 0; 125 unmap_mapping_range(mapping, 0, 0, 0); 126 ret = filemap_write_and_wait(mapping); 127 if (ret != 0) 128 goto out; 129 ret = nfs_wb_all(mapping->host); 130 out: 131 return ret; 132 } 133 134 /* 135 * Invalidate the local caches 136 */ 137 static void nfs_zap_caches_locked(struct inode *inode) 138 { 139 struct nfs_inode *nfsi = NFS_I(inode); 140 int mode = inode->i_mode; 141 142 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 143 144 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 145 nfsi->attrtimeo_timestamp = jiffies; 146 147 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 148 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 149 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 150 else 151 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 152 } 153 154 void nfs_zap_caches(struct inode *inode) 155 { 156 spin_lock(&inode->i_lock); 157 nfs_zap_caches_locked(inode); 158 spin_unlock(&inode->i_lock); 159 } 160 161 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 162 { 163 if (mapping->nrpages != 0) { 164 spin_lock(&inode->i_lock); 165 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 166 spin_unlock(&inode->i_lock); 167 } 168 } 169 170 static void nfs_zap_acl_cache(struct inode *inode) 171 { 172 void (*clear_acl_cache)(struct inode *); 173 174 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 175 if (clear_acl_cache != NULL) 176 clear_acl_cache(inode); 177 spin_lock(&inode->i_lock); 178 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 179 spin_unlock(&inode->i_lock); 180 } 181 182 void nfs_invalidate_atime(struct inode *inode) 183 { 184 spin_lock(&inode->i_lock); 185 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; 186 spin_unlock(&inode->i_lock); 187 } 188 189 /* 190 * Invalidate, but do not unhash, the inode. 191 * NB: must be called with inode->i_lock held! 192 */ 193 static void nfs_invalidate_inode(struct inode *inode) 194 { 195 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); 196 nfs_zap_caches_locked(inode); 197 } 198 199 struct nfs_find_desc { 200 struct nfs_fh *fh; 201 struct nfs_fattr *fattr; 202 }; 203 204 /* 205 * In NFSv3 we can have 64bit inode numbers. In order to support 206 * this, and re-exported directories (also seen in NFSv2) 207 * we are forced to allow 2 different inodes to have the same 208 * i_ino. 209 */ 210 static int 211 nfs_find_actor(struct inode *inode, void *opaque) 212 { 213 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 214 struct nfs_fh *fh = desc->fh; 215 struct nfs_fattr *fattr = desc->fattr; 216 217 if (NFS_FILEID(inode) != fattr->fileid) 218 return 0; 219 if (nfs_compare_fh(NFS_FH(inode), fh)) 220 return 0; 221 if (is_bad_inode(inode) || NFS_STALE(inode)) 222 return 0; 223 return 1; 224 } 225 226 static int 227 nfs_init_locked(struct inode *inode, void *opaque) 228 { 229 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 230 struct nfs_fattr *fattr = desc->fattr; 231 232 NFS_FILEID(inode) = fattr->fileid; 233 nfs_copy_fh(NFS_FH(inode), desc->fh); 234 return 0; 235 } 236 237 /* Don't use READDIRPLUS on directories that we believe are too large */ 238 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) 239 240 /* 241 * This is our front-end to iget that looks up inodes by file handle 242 * instead of inode number. 243 */ 244 struct inode * 245 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 246 { 247 struct nfs_find_desc desc = { 248 .fh = fh, 249 .fattr = fattr 250 }; 251 struct inode *inode = ERR_PTR(-ENOENT); 252 unsigned long hash; 253 254 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 255 goto out_no_inode; 256 257 if (!fattr->nlink) { 258 printk("NFS: Buggy server - nlink == 0!\n"); 259 goto out_no_inode; 260 } 261 262 hash = nfs_fattr_to_ino_t(fattr); 263 264 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 265 if (inode == NULL) { 266 inode = ERR_PTR(-ENOMEM); 267 goto out_no_inode; 268 } 269 270 if (inode->i_state & I_NEW) { 271 struct nfs_inode *nfsi = NFS_I(inode); 272 unsigned long now = jiffies; 273 274 /* We set i_ino for the few things that still rely on it, 275 * such as stat(2) */ 276 inode->i_ino = hash; 277 278 /* We can't support update_atime(), since the server will reset it */ 279 inode->i_flags |= S_NOATIME|S_NOCMTIME; 280 inode->i_mode = fattr->mode; 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 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) 293 && fattr->size <= NFS_LIMIT_READDIRPLUS) 294 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); 295 /* Deal with crossing mountpoints */ 296 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { 297 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 298 inode->i_op = &nfs_referral_inode_operations; 299 else 300 inode->i_op = &nfs_mountpoint_inode_operations; 301 inode->i_fop = NULL; 302 } 303 } else if (S_ISLNK(inode->i_mode)) 304 inode->i_op = &nfs_symlink_inode_operations; 305 else 306 init_special_inode(inode, inode->i_mode, fattr->rdev); 307 308 nfsi->read_cache_jiffies = fattr->time_start; 309 nfsi->last_updated = now; 310 nfsi->cache_change_attribute = now; 311 inode->i_atime = fattr->atime; 312 inode->i_mtime = fattr->mtime; 313 inode->i_ctime = fattr->ctime; 314 if (fattr->valid & NFS_ATTR_FATTR_V4) 315 nfsi->change_attr = fattr->change_attr; 316 inode->i_size = nfs_size_to_loff_t(fattr->size); 317 inode->i_nlink = fattr->nlink; 318 inode->i_uid = fattr->uid; 319 inode->i_gid = fattr->gid; 320 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 321 /* 322 * report the blocks in 512byte units 323 */ 324 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 325 } else { 326 inode->i_blocks = fattr->du.nfs2.blocks; 327 } 328 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 329 nfsi->attrtimeo_timestamp = now; 330 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 331 nfsi->access_cache = RB_ROOT; 332 333 unlock_new_inode(inode); 334 } else 335 nfs_refresh_inode(inode, fattr); 336 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 337 inode->i_sb->s_id, 338 (long long)NFS_FILEID(inode), 339 atomic_read(&inode->i_count)); 340 341 out: 342 return inode; 343 344 out_no_inode: 345 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 346 goto out; 347 } 348 349 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) 350 351 int 352 nfs_setattr(struct dentry *dentry, struct iattr *attr) 353 { 354 struct inode *inode = dentry->d_inode; 355 struct nfs_fattr fattr; 356 int error; 357 358 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 359 360 /* skip mode change if it's just for clearing setuid/setgid */ 361 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 362 attr->ia_valid &= ~ATTR_MODE; 363 364 if (attr->ia_valid & ATTR_SIZE) { 365 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 366 attr->ia_valid &= ~ATTR_SIZE; 367 } 368 369 /* Optimization: if the end result is no change, don't RPC */ 370 attr->ia_valid &= NFS_VALID_ATTRS; 371 if (attr->ia_valid == 0) 372 return 0; 373 374 lock_kernel(); 375 /* Write all dirty data */ 376 if (S_ISREG(inode->i_mode)) { 377 filemap_write_and_wait(inode->i_mapping); 378 nfs_wb_all(inode); 379 } 380 /* 381 * Return any delegations if we're going to change ACLs 382 */ 383 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 384 nfs_inode_return_delegation(inode); 385 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); 386 if (error == 0) 387 nfs_refresh_inode(inode, &fattr); 388 unlock_kernel(); 389 return error; 390 } 391 392 /** 393 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 394 * @inode: pointer to struct inode 395 * @attr: pointer to struct iattr 396 * 397 * Note: we do this in the *proc.c in order to ensure that 398 * it works for things like exclusive creates too. 399 */ 400 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 401 { 402 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 403 if ((attr->ia_valid & ATTR_MODE) != 0) { 404 int mode = attr->ia_mode & S_IALLUGO; 405 mode |= inode->i_mode & ~S_IALLUGO; 406 inode->i_mode = mode; 407 } 408 if ((attr->ia_valid & ATTR_UID) != 0) 409 inode->i_uid = attr->ia_uid; 410 if ((attr->ia_valid & ATTR_GID) != 0) 411 inode->i_gid = attr->ia_gid; 412 spin_lock(&inode->i_lock); 413 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 414 spin_unlock(&inode->i_lock); 415 } 416 if ((attr->ia_valid & ATTR_SIZE) != 0) { 417 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 418 inode->i_size = attr->ia_size; 419 vmtruncate(inode, attr->ia_size); 420 } 421 } 422 423 static int nfs_wait_schedule(void *word) 424 { 425 if (signal_pending(current)) 426 return -ERESTARTSYS; 427 schedule(); 428 return 0; 429 } 430 431 /* 432 * Wait for the inode to get unlocked. 433 */ 434 static int nfs_wait_on_inode(struct inode *inode) 435 { 436 struct rpc_clnt *clnt = NFS_CLIENT(inode); 437 struct nfs_inode *nfsi = NFS_I(inode); 438 sigset_t oldmask; 439 int error; 440 441 rpc_clnt_sigmask(clnt, &oldmask); 442 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, 443 nfs_wait_schedule, TASK_INTERRUPTIBLE); 444 rpc_clnt_sigunmask(clnt, &oldmask); 445 446 return error; 447 } 448 449 static void nfs_wake_up_inode(struct inode *inode) 450 { 451 struct nfs_inode *nfsi = NFS_I(inode); 452 453 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); 454 smp_mb__after_clear_bit(); 455 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); 456 } 457 458 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 459 { 460 struct inode *inode = dentry->d_inode; 461 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 462 int err; 463 464 /* Flush out writes to the server in order to update c/mtime */ 465 if (S_ISREG(inode->i_mode)) 466 nfs_wb_nocommit(inode); 467 468 /* 469 * We may force a getattr if the user cares about atime. 470 * 471 * Note that we only have to check the vfsmount flags here: 472 * - NFS always sets S_NOATIME by so checking it would give a 473 * bogus result 474 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 475 * no point in checking those. 476 */ 477 if ((mnt->mnt_flags & MNT_NOATIME) || 478 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 479 need_atime = 0; 480 481 if (need_atime) 482 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 483 else 484 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 485 if (!err) { 486 generic_fillattr(inode, stat); 487 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 488 } 489 return err; 490 } 491 492 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred) 493 { 494 struct nfs_open_context *ctx; 495 496 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 497 if (ctx != NULL) { 498 ctx->path.dentry = dget(dentry); 499 ctx->path.mnt = mntget(mnt); 500 ctx->cred = get_rpccred(cred); 501 ctx->state = NULL; 502 ctx->lockowner = current->files; 503 ctx->error = 0; 504 ctx->dir_cookie = 0; 505 atomic_set(&ctx->count, 1); 506 } 507 return ctx; 508 } 509 510 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 511 { 512 if (ctx != NULL) 513 atomic_inc(&ctx->count); 514 return ctx; 515 } 516 517 static void __put_nfs_open_context(struct nfs_open_context *ctx, int wait) 518 { 519 struct inode *inode = ctx->path.dentry->d_inode; 520 521 if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock)) 522 return; 523 list_del(&ctx->list); 524 spin_unlock(&inode->i_lock); 525 if (ctx->state != NULL) { 526 if (wait) 527 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode); 528 else 529 nfs4_close_state(&ctx->path, ctx->state, ctx->mode); 530 } 531 if (ctx->cred != NULL) 532 put_rpccred(ctx->cred); 533 dput(ctx->path.dentry); 534 mntput(ctx->path.mnt); 535 kfree(ctx); 536 } 537 538 void put_nfs_open_context(struct nfs_open_context *ctx) 539 { 540 __put_nfs_open_context(ctx, 0); 541 } 542 543 static void put_nfs_open_context_sync(struct nfs_open_context *ctx) 544 { 545 __put_nfs_open_context(ctx, 1); 546 } 547 548 /* 549 * Ensure that mmap has a recent RPC credential for use when writing out 550 * shared pages 551 */ 552 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 553 { 554 struct inode *inode = filp->f_path.dentry->d_inode; 555 struct nfs_inode *nfsi = NFS_I(inode); 556 557 filp->private_data = get_nfs_open_context(ctx); 558 spin_lock(&inode->i_lock); 559 list_add(&ctx->list, &nfsi->open_files); 560 spin_unlock(&inode->i_lock); 561 } 562 563 /* 564 * Given an inode, search for an open context with the desired characteristics 565 */ 566 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode) 567 { 568 struct nfs_inode *nfsi = NFS_I(inode); 569 struct nfs_open_context *pos, *ctx = NULL; 570 571 spin_lock(&inode->i_lock); 572 list_for_each_entry(pos, &nfsi->open_files, list) { 573 if (cred != NULL && pos->cred != cred) 574 continue; 575 if ((pos->mode & mode) == mode) { 576 ctx = get_nfs_open_context(pos); 577 break; 578 } 579 } 580 spin_unlock(&inode->i_lock); 581 return ctx; 582 } 583 584 static void nfs_file_clear_open_context(struct file *filp) 585 { 586 struct inode *inode = filp->f_path.dentry->d_inode; 587 struct nfs_open_context *ctx = nfs_file_open_context(filp); 588 589 if (ctx) { 590 filp->private_data = NULL; 591 spin_lock(&inode->i_lock); 592 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 593 spin_unlock(&inode->i_lock); 594 put_nfs_open_context_sync(ctx); 595 } 596 } 597 598 /* 599 * These allocate and release file read/write context information. 600 */ 601 int nfs_open(struct inode *inode, struct file *filp) 602 { 603 struct nfs_open_context *ctx; 604 struct rpc_cred *cred; 605 606 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 607 if (IS_ERR(cred)) 608 return PTR_ERR(cred); 609 ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred); 610 put_rpccred(cred); 611 if (ctx == NULL) 612 return -ENOMEM; 613 ctx->mode = filp->f_mode; 614 nfs_file_set_open_context(filp, ctx); 615 put_nfs_open_context(ctx); 616 return 0; 617 } 618 619 int nfs_release(struct inode *inode, struct file *filp) 620 { 621 nfs_file_clear_open_context(filp); 622 return 0; 623 } 624 625 /* 626 * This function is called whenever some part of NFS notices that 627 * the cached attributes have to be refreshed. 628 */ 629 int 630 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 631 { 632 int status = -ESTALE; 633 struct nfs_fattr fattr; 634 struct nfs_inode *nfsi = NFS_I(inode); 635 636 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 637 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 638 639 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 640 lock_kernel(); 641 if (is_bad_inode(inode)) 642 goto out_nowait; 643 if (NFS_STALE(inode)) 644 goto out_nowait; 645 646 status = nfs_wait_on_inode(inode); 647 if (status < 0) 648 goto out; 649 650 status = -ESTALE; 651 if (NFS_STALE(inode)) 652 goto out; 653 654 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); 655 if (status != 0) { 656 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 657 inode->i_sb->s_id, 658 (long long)NFS_FILEID(inode), status); 659 if (status == -ESTALE) { 660 nfs_zap_caches(inode); 661 if (!S_ISDIR(inode->i_mode)) 662 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); 663 } 664 goto out; 665 } 666 667 spin_lock(&inode->i_lock); 668 status = nfs_update_inode(inode, &fattr); 669 if (status) { 670 spin_unlock(&inode->i_lock); 671 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 672 inode->i_sb->s_id, 673 (long long)NFS_FILEID(inode), status); 674 goto out; 675 } 676 spin_unlock(&inode->i_lock); 677 678 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 679 nfs_zap_acl_cache(inode); 680 681 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 682 inode->i_sb->s_id, 683 (long long)NFS_FILEID(inode)); 684 685 out: 686 nfs_wake_up_inode(inode); 687 688 out_nowait: 689 unlock_kernel(); 690 return status; 691 } 692 693 int nfs_attribute_timeout(struct inode *inode) 694 { 695 struct nfs_inode *nfsi = NFS_I(inode); 696 697 if (nfs_have_delegation(inode, FMODE_READ)) 698 return 0; 699 return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 700 } 701 702 /** 703 * nfs_revalidate_inode - Revalidate the inode attributes 704 * @server - pointer to nfs_server struct 705 * @inode - pointer to inode struct 706 * 707 * Updates inode attribute information by retrieving the data from the server. 708 */ 709 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 710 { 711 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) 712 && !nfs_attribute_timeout(inode)) 713 return NFS_STALE(inode) ? -ESTALE : 0; 714 return __nfs_revalidate_inode(server, inode); 715 } 716 717 static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) 718 { 719 struct nfs_inode *nfsi = NFS_I(inode); 720 721 if (mapping->nrpages != 0) { 722 int ret = invalidate_inode_pages2(mapping); 723 if (ret < 0) 724 return ret; 725 } 726 spin_lock(&inode->i_lock); 727 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 728 if (S_ISDIR(inode->i_mode)) 729 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 730 spin_unlock(&inode->i_lock); 731 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 732 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 733 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 734 return 0; 735 } 736 737 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 738 { 739 int ret = 0; 740 741 mutex_lock(&inode->i_mutex); 742 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) { 743 ret = nfs_sync_mapping(mapping); 744 if (ret == 0) 745 ret = nfs_invalidate_mapping_nolock(inode, mapping); 746 } 747 mutex_unlock(&inode->i_mutex); 748 return ret; 749 } 750 751 /** 752 * nfs_revalidate_mapping_nolock - Revalidate the pagecache 753 * @inode - pointer to host inode 754 * @mapping - pointer to mapping 755 */ 756 int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) 757 { 758 struct nfs_inode *nfsi = NFS_I(inode); 759 int ret = 0; 760 761 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 762 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { 763 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 764 if (ret < 0) 765 goto out; 766 } 767 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 768 ret = nfs_invalidate_mapping_nolock(inode, mapping); 769 out: 770 return ret; 771 } 772 773 /** 774 * nfs_revalidate_mapping - Revalidate the pagecache 775 * @inode - pointer to host inode 776 * @mapping - pointer to mapping 777 * 778 * This version of the function will take the inode->i_mutex and attempt to 779 * flush out all dirty data if it needs to invalidate the page cache. 780 */ 781 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 782 { 783 struct nfs_inode *nfsi = NFS_I(inode); 784 int ret = 0; 785 786 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 787 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { 788 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 789 if (ret < 0) 790 goto out; 791 } 792 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 793 ret = nfs_invalidate_mapping(inode, mapping); 794 out: 795 return ret; 796 } 797 798 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 799 { 800 struct nfs_inode *nfsi = NFS_I(inode); 801 802 if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 && 803 nfsi->change_attr == fattr->pre_change_attr) { 804 nfsi->change_attr = fattr->change_attr; 805 if (S_ISDIR(inode->i_mode)) 806 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 807 } 808 /* If we have atomic WCC data, we may update some attributes */ 809 if ((fattr->valid & NFS_ATTR_WCC) != 0) { 810 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) 811 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 812 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 813 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 814 if (S_ISDIR(inode->i_mode)) 815 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 816 } 817 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) 818 inode->i_size = fattr->size; 819 } 820 } 821 822 /** 823 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 824 * @inode - pointer to inode 825 * @fattr - updated attributes 826 * 827 * Verifies the attribute cache. If we have just changed the attributes, 828 * so that fattr carries weak cache consistency data, then it may 829 * also update the ctime/mtime/change_attribute. 830 */ 831 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 832 { 833 struct nfs_inode *nfsi = NFS_I(inode); 834 loff_t cur_size, new_isize; 835 unsigned long invalid = 0; 836 837 838 /* Has the inode gone and changed behind our back? */ 839 if (nfsi->fileid != fattr->fileid 840 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 841 return -EIO; 842 } 843 844 /* Do atomic weak cache consistency updates */ 845 nfs_wcc_update_inode(inode, fattr); 846 847 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && 848 nfsi->change_attr != fattr->change_attr) 849 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 850 851 /* Verify a few of the more important attributes */ 852 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) 853 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 854 855 cur_size = i_size_read(inode); 856 new_isize = nfs_size_to_loff_t(fattr->size); 857 if (cur_size != new_isize && nfsi->npages == 0) 858 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 859 860 /* Have any file permissions changed? */ 861 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) 862 || inode->i_uid != fattr->uid 863 || inode->i_gid != fattr->gid) 864 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 865 866 /* Has the link count changed? */ 867 if (inode->i_nlink != fattr->nlink) 868 invalid |= NFS_INO_INVALID_ATTR; 869 870 if (!timespec_equal(&inode->i_atime, &fattr->atime)) 871 invalid |= NFS_INO_INVALID_ATIME; 872 873 if (invalid != 0) 874 nfsi->cache_validity |= invalid; 875 else 876 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 877 | NFS_INO_INVALID_ATIME 878 | NFS_INO_REVAL_PAGECACHE); 879 880 nfsi->read_cache_jiffies = fattr->time_start; 881 return 0; 882 } 883 884 /** 885 * nfs_refresh_inode - try to update the inode attribute cache 886 * @inode - pointer to inode 887 * @fattr - updated attributes 888 * 889 * Check that an RPC call that returned attributes has not overlapped with 890 * other recent updates of the inode metadata, then decide whether it is 891 * safe to do a full update of the inode attributes, or whether just to 892 * call nfs_check_inode_attributes. 893 */ 894 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 895 { 896 struct nfs_inode *nfsi = NFS_I(inode); 897 int status; 898 899 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 900 return 0; 901 spin_lock(&inode->i_lock); 902 if (time_after(fattr->time_start, nfsi->last_updated)) 903 status = nfs_update_inode(inode, fattr); 904 else 905 status = nfs_check_inode_attributes(inode, fattr); 906 907 spin_unlock(&inode->i_lock); 908 return status; 909 } 910 911 /** 912 * nfs_post_op_update_inode - try to update the inode attribute cache 913 * @inode - pointer to inode 914 * @fattr - updated attributes 915 * 916 * After an operation that has changed the inode metadata, mark the 917 * attribute cache as being invalid, then try to update it. 918 * 919 * NB: if the server didn't return any post op attributes, this 920 * function will force the retrieval of attributes before the next 921 * NFS request. Thus it should be used only for operations that 922 * are expected to change one or more attributes, to avoid 923 * unnecessary NFS requests and trips through nfs_update_inode(). 924 */ 925 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 926 { 927 struct nfs_inode *nfsi = NFS_I(inode); 928 929 spin_lock(&inode->i_lock); 930 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 931 if (S_ISDIR(inode->i_mode)) 932 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 933 spin_unlock(&inode->i_lock); 934 return nfs_refresh_inode(inode, fattr); 935 } 936 937 /** 938 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 939 * @inode - pointer to inode 940 * @fattr - updated attributes 941 * 942 * After an operation that has changed the inode metadata, mark the 943 * attribute cache as being invalid, then try to update it. Fake up 944 * weak cache consistency data, if none exist. 945 * 946 * This function is mainly designed to be used by the ->write_done() functions. 947 */ 948 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 949 { 950 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && 951 (fattr->valid & NFS_ATTR_WCC_V4) == 0) { 952 fattr->pre_change_attr = NFS_I(inode)->change_attr; 953 fattr->valid |= NFS_ATTR_WCC_V4; 954 } 955 if ((fattr->valid & NFS_ATTR_FATTR) != 0 && 956 (fattr->valid & NFS_ATTR_WCC) == 0) { 957 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 958 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 959 fattr->pre_size = inode->i_size; 960 fattr->valid |= NFS_ATTR_WCC; 961 } 962 return nfs_post_op_update_inode(inode, fattr); 963 } 964 965 /* 966 * Many nfs protocol calls return the new file attributes after 967 * an operation. Here we update the inode to reflect the state 968 * of the server's inode. 969 * 970 * This is a bit tricky because we have to make sure all dirty pages 971 * have been sent off to the server before calling invalidate_inode_pages. 972 * To make sure no other process adds more write requests while we try 973 * our best to flush them, we make them sleep during the attribute refresh. 974 * 975 * A very similar scenario holds for the dir cache. 976 */ 977 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 978 { 979 struct nfs_server *server; 980 struct nfs_inode *nfsi = NFS_I(inode); 981 loff_t cur_isize, new_isize; 982 unsigned long invalid = 0; 983 unsigned long now = jiffies; 984 985 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 986 __FUNCTION__, inode->i_sb->s_id, inode->i_ino, 987 atomic_read(&inode->i_count), fattr->valid); 988 989 if (nfsi->fileid != fattr->fileid) 990 goto out_fileid; 991 992 /* 993 * Make sure the inode's type hasn't changed. 994 */ 995 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 996 goto out_changed; 997 998 server = NFS_SERVER(inode); 999 /* Update the fsid? */ 1000 if (S_ISDIR(inode->i_mode) 1001 && !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 1002 server->fsid = fattr->fsid; 1003 1004 /* 1005 * Update the read time so we don't revalidate too often. 1006 */ 1007 nfsi->read_cache_jiffies = fattr->time_start; 1008 1009 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME 1010 | NFS_INO_REVAL_PAGECACHE); 1011 1012 /* Do atomic weak cache consistency updates */ 1013 nfs_wcc_update_inode(inode, fattr); 1014 1015 /* More cache consistency checks */ 1016 if (!(fattr->valid & NFS_ATTR_FATTR_V4)) { 1017 /* NFSv2/v3: Check if the mtime agrees */ 1018 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1019 dprintk("NFS: mtime change on server for file %s/%ld\n", 1020 inode->i_sb->s_id, inode->i_ino); 1021 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1022 nfsi->cache_change_attribute = now; 1023 } 1024 /* If ctime has changed we should definitely clear access+acl caches */ 1025 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) 1026 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1027 } else if (nfsi->change_attr != fattr->change_attr) { 1028 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1029 inode->i_sb->s_id, inode->i_ino); 1030 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1031 nfsi->cache_change_attribute = now; 1032 } 1033 1034 /* Check if our cached file size is stale */ 1035 new_isize = nfs_size_to_loff_t(fattr->size); 1036 cur_isize = i_size_read(inode); 1037 if (new_isize != cur_isize) { 1038 /* Do we perhaps have any outstanding writes, or has 1039 * the file grown beyond our last write? */ 1040 if (nfsi->npages == 0 || new_isize > cur_isize) { 1041 inode->i_size = new_isize; 1042 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1043 } 1044 dprintk("NFS: isize change on server for file %s/%ld\n", 1045 inode->i_sb->s_id, inode->i_ino); 1046 } 1047 1048 1049 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1050 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1051 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1052 nfsi->change_attr = fattr->change_attr; 1053 1054 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || 1055 inode->i_uid != fattr->uid || 1056 inode->i_gid != fattr->gid) 1057 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1058 1059 inode->i_mode = fattr->mode; 1060 inode->i_nlink = fattr->nlink; 1061 inode->i_uid = fattr->uid; 1062 inode->i_gid = fattr->gid; 1063 1064 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 1065 /* 1066 * report the blocks in 512byte units 1067 */ 1068 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1069 } else { 1070 inode->i_blocks = fattr->du.nfs2.blocks; 1071 } 1072 1073 /* Update attrtimeo value if we're out of the unstable period */ 1074 if (invalid & NFS_INO_INVALID_ATTR) { 1075 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1076 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1077 nfsi->attrtimeo_timestamp = now; 1078 nfsi->last_updated = now; 1079 } else { 1080 if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1081 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1082 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1083 nfsi->attrtimeo_timestamp = now; 1084 } 1085 /* 1086 * Avoid jiffy wraparound issues with nfsi->last_updated 1087 */ 1088 if (!time_in_range(nfsi->last_updated, nfsi->read_cache_jiffies, now)) 1089 nfsi->last_updated = nfsi->read_cache_jiffies; 1090 } 1091 invalid &= ~NFS_INO_INVALID_ATTR; 1092 /* Don't invalidate the data if we were to blame */ 1093 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1094 || S_ISLNK(inode->i_mode))) 1095 invalid &= ~NFS_INO_INVALID_DATA; 1096 if (!nfs_have_delegation(inode, FMODE_READ) || 1097 (nfsi->cache_validity & NFS_INO_REVAL_FORCED)) 1098 nfsi->cache_validity |= invalid; 1099 nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED; 1100 1101 return 0; 1102 out_changed: 1103 /* 1104 * Big trouble! The inode has become a different object. 1105 */ 1106 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1107 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); 1108 out_err: 1109 /* 1110 * No need to worry about unhashing the dentry, as the 1111 * lookup validation will know that the inode is bad. 1112 * (But we fall through to invalidate the caches.) 1113 */ 1114 nfs_invalidate_inode(inode); 1115 return -ESTALE; 1116 1117 out_fileid: 1118 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1119 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1120 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, 1121 (long long)nfsi->fileid, (long long)fattr->fileid); 1122 goto out_err; 1123 } 1124 1125 1126 #ifdef CONFIG_NFS_V4 1127 1128 /* 1129 * Clean out any remaining NFSv4 state that might be left over due 1130 * to open() calls that passed nfs_atomic_lookup, but failed to call 1131 * nfs_open(). 1132 */ 1133 void nfs4_clear_inode(struct inode *inode) 1134 { 1135 /* If we are holding a delegation, return it! */ 1136 nfs_inode_return_delegation(inode); 1137 /* First call standard NFS clear_inode() code */ 1138 nfs_clear_inode(inode); 1139 } 1140 #endif 1141 1142 struct inode *nfs_alloc_inode(struct super_block *sb) 1143 { 1144 struct nfs_inode *nfsi; 1145 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1146 if (!nfsi) 1147 return NULL; 1148 nfsi->flags = 0UL; 1149 nfsi->cache_validity = 0UL; 1150 #ifdef CONFIG_NFS_V3_ACL 1151 nfsi->acl_access = ERR_PTR(-EAGAIN); 1152 nfsi->acl_default = ERR_PTR(-EAGAIN); 1153 #endif 1154 #ifdef CONFIG_NFS_V4 1155 nfsi->nfs4_acl = NULL; 1156 #endif /* CONFIG_NFS_V4 */ 1157 return &nfsi->vfs_inode; 1158 } 1159 1160 void nfs_destroy_inode(struct inode *inode) 1161 { 1162 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1163 } 1164 1165 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1166 { 1167 #ifdef CONFIG_NFS_V4 1168 INIT_LIST_HEAD(&nfsi->open_states); 1169 nfsi->delegation = NULL; 1170 nfsi->delegation_state = 0; 1171 init_rwsem(&nfsi->rwsem); 1172 #endif 1173 } 1174 1175 static void init_once(struct kmem_cache * cachep, void *foo) 1176 { 1177 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1178 1179 inode_init_once(&nfsi->vfs_inode); 1180 INIT_LIST_HEAD(&nfsi->open_files); 1181 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1182 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1183 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1184 nfsi->ncommit = 0; 1185 nfsi->npages = 0; 1186 atomic_set(&nfsi->silly_count, 1); 1187 INIT_HLIST_HEAD(&nfsi->silly_list); 1188 init_waitqueue_head(&nfsi->waitqueue); 1189 nfs4_init_once(nfsi); 1190 } 1191 1192 static int __init nfs_init_inodecache(void) 1193 { 1194 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1195 sizeof(struct nfs_inode), 1196 0, (SLAB_RECLAIM_ACCOUNT| 1197 SLAB_MEM_SPREAD), 1198 init_once); 1199 if (nfs_inode_cachep == NULL) 1200 return -ENOMEM; 1201 1202 return 0; 1203 } 1204 1205 static void nfs_destroy_inodecache(void) 1206 { 1207 kmem_cache_destroy(nfs_inode_cachep); 1208 } 1209 1210 /* 1211 * Initialize NFS 1212 */ 1213 static int __init init_nfs_fs(void) 1214 { 1215 int err; 1216 1217 err = nfs_fs_proc_init(); 1218 if (err) 1219 goto out5; 1220 1221 err = nfs_init_nfspagecache(); 1222 if (err) 1223 goto out4; 1224 1225 err = nfs_init_inodecache(); 1226 if (err) 1227 goto out3; 1228 1229 err = nfs_init_readpagecache(); 1230 if (err) 1231 goto out2; 1232 1233 err = nfs_init_writepagecache(); 1234 if (err) 1235 goto out1; 1236 1237 err = nfs_init_directcache(); 1238 if (err) 1239 goto out0; 1240 1241 #ifdef CONFIG_PROC_FS 1242 rpc_proc_register(&nfs_rpcstat); 1243 #endif 1244 if ((err = register_nfs_fs()) != 0) 1245 goto out; 1246 return 0; 1247 out: 1248 #ifdef CONFIG_PROC_FS 1249 rpc_proc_unregister("nfs"); 1250 #endif 1251 nfs_destroy_directcache(); 1252 out0: 1253 nfs_destroy_writepagecache(); 1254 out1: 1255 nfs_destroy_readpagecache(); 1256 out2: 1257 nfs_destroy_inodecache(); 1258 out3: 1259 nfs_destroy_nfspagecache(); 1260 out4: 1261 nfs_fs_proc_exit(); 1262 out5: 1263 return err; 1264 } 1265 1266 static void __exit exit_nfs_fs(void) 1267 { 1268 nfs_destroy_directcache(); 1269 nfs_destroy_writepagecache(); 1270 nfs_destroy_readpagecache(); 1271 nfs_destroy_inodecache(); 1272 nfs_destroy_nfspagecache(); 1273 #ifdef CONFIG_PROC_FS 1274 rpc_proc_unregister("nfs"); 1275 #endif 1276 unregister_nfs_fs(); 1277 nfs_fs_proc_exit(); 1278 } 1279 1280 /* Not quite true; I just maintain it */ 1281 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1282 MODULE_LICENSE("GPL"); 1283 module_param(enable_ino64, bool, 0644); 1284 1285 module_init(init_nfs_fs) 1286 module_exit(exit_nfs_fs) 1287