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 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 #define NFS_PARANOIA 1 52 53 static void nfs_invalidate_inode(struct inode *); 54 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 55 56 static void nfs_zap_acl_cache(struct inode *); 57 58 static struct kmem_cache * nfs_inode_cachep; 59 60 static inline unsigned long 61 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 62 { 63 return nfs_fileid_to_ino_t(fattr->fileid); 64 } 65 66 int nfs_write_inode(struct inode *inode, int sync) 67 { 68 int flags = sync ? FLUSH_SYNC : 0; 69 int ret; 70 71 ret = nfs_commit_inode(inode, flags); 72 if (ret < 0) 73 return ret; 74 return 0; 75 } 76 77 void nfs_clear_inode(struct inode *inode) 78 { 79 /* 80 * The following should never happen... 81 */ 82 BUG_ON(nfs_have_writebacks(inode)); 83 BUG_ON(!list_empty(&NFS_I(inode)->open_files)); 84 BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0); 85 nfs_zap_acl_cache(inode); 86 nfs_access_zap_cache(inode); 87 } 88 89 /** 90 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 91 */ 92 int nfs_sync_mapping(struct address_space *mapping) 93 { 94 int ret; 95 96 if (mapping->nrpages == 0) 97 return 0; 98 unmap_mapping_range(mapping, 0, 0, 0); 99 ret = filemap_write_and_wait(mapping); 100 if (ret != 0) 101 goto out; 102 ret = nfs_wb_all(mapping->host); 103 out: 104 return ret; 105 } 106 107 /* 108 * Invalidate the local caches 109 */ 110 static void nfs_zap_caches_locked(struct inode *inode) 111 { 112 struct nfs_inode *nfsi = NFS_I(inode); 113 int mode = inode->i_mode; 114 115 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 116 117 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); 118 NFS_ATTRTIMEO_UPDATE(inode) = jiffies; 119 120 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 121 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 122 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 123 else 124 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 125 } 126 127 void nfs_zap_caches(struct inode *inode) 128 { 129 spin_lock(&inode->i_lock); 130 nfs_zap_caches_locked(inode); 131 spin_unlock(&inode->i_lock); 132 } 133 134 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 135 { 136 if (mapping->nrpages != 0) { 137 spin_lock(&inode->i_lock); 138 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 139 spin_unlock(&inode->i_lock); 140 } 141 } 142 143 static void nfs_zap_acl_cache(struct inode *inode) 144 { 145 void (*clear_acl_cache)(struct inode *); 146 147 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 148 if (clear_acl_cache != NULL) 149 clear_acl_cache(inode); 150 spin_lock(&inode->i_lock); 151 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 152 spin_unlock(&inode->i_lock); 153 } 154 155 /* 156 * Invalidate, but do not unhash, the inode. 157 * NB: must be called with inode->i_lock held! 158 */ 159 static void nfs_invalidate_inode(struct inode *inode) 160 { 161 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); 162 nfs_zap_caches_locked(inode); 163 } 164 165 struct nfs_find_desc { 166 struct nfs_fh *fh; 167 struct nfs_fattr *fattr; 168 }; 169 170 /* 171 * In NFSv3 we can have 64bit inode numbers. In order to support 172 * this, and re-exported directories (also seen in NFSv2) 173 * we are forced to allow 2 different inodes to have the same 174 * i_ino. 175 */ 176 static int 177 nfs_find_actor(struct inode *inode, void *opaque) 178 { 179 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 180 struct nfs_fh *fh = desc->fh; 181 struct nfs_fattr *fattr = desc->fattr; 182 183 if (NFS_FILEID(inode) != fattr->fileid) 184 return 0; 185 if (nfs_compare_fh(NFS_FH(inode), fh)) 186 return 0; 187 if (is_bad_inode(inode) || NFS_STALE(inode)) 188 return 0; 189 return 1; 190 } 191 192 static int 193 nfs_init_locked(struct inode *inode, void *opaque) 194 { 195 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 196 struct nfs_fattr *fattr = desc->fattr; 197 198 NFS_FILEID(inode) = fattr->fileid; 199 nfs_copy_fh(NFS_FH(inode), desc->fh); 200 return 0; 201 } 202 203 /* Don't use READDIRPLUS on directories that we believe are too large */ 204 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) 205 206 /* 207 * This is our front-end to iget that looks up inodes by file handle 208 * instead of inode number. 209 */ 210 struct inode * 211 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 212 { 213 struct nfs_find_desc desc = { 214 .fh = fh, 215 .fattr = fattr 216 }; 217 struct inode *inode = ERR_PTR(-ENOENT); 218 unsigned long hash; 219 220 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 221 goto out_no_inode; 222 223 if (!fattr->nlink) { 224 printk("NFS: Buggy server - nlink == 0!\n"); 225 goto out_no_inode; 226 } 227 228 hash = nfs_fattr_to_ino_t(fattr); 229 230 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 231 if (inode == NULL) { 232 inode = ERR_PTR(-ENOMEM); 233 goto out_no_inode; 234 } 235 236 if (inode->i_state & I_NEW) { 237 struct nfs_inode *nfsi = NFS_I(inode); 238 239 /* We set i_ino for the few things that still rely on it, 240 * such as stat(2) */ 241 inode->i_ino = hash; 242 243 /* We can't support update_atime(), since the server will reset it */ 244 inode->i_flags |= S_NOATIME|S_NOCMTIME; 245 inode->i_mode = fattr->mode; 246 /* Why so? Because we want revalidate for devices/FIFOs, and 247 * that's precisely what we have in nfs_file_inode_operations. 248 */ 249 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 250 if (S_ISREG(inode->i_mode)) { 251 inode->i_fop = &nfs_file_operations; 252 inode->i_data.a_ops = &nfs_file_aops; 253 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 254 } else if (S_ISDIR(inode->i_mode)) { 255 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 256 inode->i_fop = &nfs_dir_operations; 257 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) 258 && fattr->size <= NFS_LIMIT_READDIRPLUS) 259 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); 260 /* Deal with crossing mountpoints */ 261 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { 262 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 263 inode->i_op = &nfs_referral_inode_operations; 264 else 265 inode->i_op = &nfs_mountpoint_inode_operations; 266 inode->i_fop = NULL; 267 } 268 } else if (S_ISLNK(inode->i_mode)) 269 inode->i_op = &nfs_symlink_inode_operations; 270 else 271 init_special_inode(inode, inode->i_mode, fattr->rdev); 272 273 nfsi->read_cache_jiffies = fattr->time_start; 274 nfsi->last_updated = jiffies; 275 inode->i_atime = fattr->atime; 276 inode->i_mtime = fattr->mtime; 277 inode->i_ctime = fattr->ctime; 278 if (fattr->valid & NFS_ATTR_FATTR_V4) 279 nfsi->change_attr = fattr->change_attr; 280 inode->i_size = nfs_size_to_loff_t(fattr->size); 281 inode->i_nlink = fattr->nlink; 282 inode->i_uid = fattr->uid; 283 inode->i_gid = fattr->gid; 284 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 285 /* 286 * report the blocks in 512byte units 287 */ 288 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 289 } else { 290 inode->i_blocks = fattr->du.nfs2.blocks; 291 } 292 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 293 nfsi->attrtimeo_timestamp = jiffies; 294 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 295 nfsi->access_cache = RB_ROOT; 296 297 unlock_new_inode(inode); 298 } else 299 nfs_refresh_inode(inode, fattr); 300 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 301 inode->i_sb->s_id, 302 (long long)NFS_FILEID(inode), 303 atomic_read(&inode->i_count)); 304 305 out: 306 return inode; 307 308 out_no_inode: 309 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 310 goto out; 311 } 312 313 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) 314 315 int 316 nfs_setattr(struct dentry *dentry, struct iattr *attr) 317 { 318 struct inode *inode = dentry->d_inode; 319 struct nfs_fattr fattr; 320 int error; 321 322 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 323 324 if (attr->ia_valid & ATTR_SIZE) { 325 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 326 attr->ia_valid &= ~ATTR_SIZE; 327 } 328 329 /* Optimization: if the end result is no change, don't RPC */ 330 attr->ia_valid &= NFS_VALID_ATTRS; 331 if (attr->ia_valid == 0) 332 return 0; 333 334 lock_kernel(); 335 nfs_begin_data_update(inode); 336 /* Write all dirty data */ 337 filemap_write_and_wait(inode->i_mapping); 338 nfs_wb_all(inode); 339 /* 340 * Return any delegations if we're going to change ACLs 341 */ 342 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 343 nfs_inode_return_delegation(inode); 344 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); 345 if (error == 0) 346 nfs_refresh_inode(inode, &fattr); 347 nfs_end_data_update(inode); 348 unlock_kernel(); 349 return error; 350 } 351 352 /** 353 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 354 * @inode: pointer to struct inode 355 * @attr: pointer to struct iattr 356 * 357 * Note: we do this in the *proc.c in order to ensure that 358 * it works for things like exclusive creates too. 359 */ 360 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 361 { 362 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 363 if ((attr->ia_valid & ATTR_MODE) != 0) { 364 int mode = attr->ia_mode & S_IALLUGO; 365 mode |= inode->i_mode & ~S_IALLUGO; 366 inode->i_mode = mode; 367 } 368 if ((attr->ia_valid & ATTR_UID) != 0) 369 inode->i_uid = attr->ia_uid; 370 if ((attr->ia_valid & ATTR_GID) != 0) 371 inode->i_gid = attr->ia_gid; 372 spin_lock(&inode->i_lock); 373 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 374 spin_unlock(&inode->i_lock); 375 } 376 if ((attr->ia_valid & ATTR_SIZE) != 0) { 377 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 378 inode->i_size = attr->ia_size; 379 vmtruncate(inode, attr->ia_size); 380 } 381 } 382 383 static int nfs_wait_schedule(void *word) 384 { 385 if (signal_pending(current)) 386 return -ERESTARTSYS; 387 schedule(); 388 return 0; 389 } 390 391 /* 392 * Wait for the inode to get unlocked. 393 */ 394 static int nfs_wait_on_inode(struct inode *inode) 395 { 396 struct rpc_clnt *clnt = NFS_CLIENT(inode); 397 struct nfs_inode *nfsi = NFS_I(inode); 398 sigset_t oldmask; 399 int error; 400 401 rpc_clnt_sigmask(clnt, &oldmask); 402 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, 403 nfs_wait_schedule, TASK_INTERRUPTIBLE); 404 rpc_clnt_sigunmask(clnt, &oldmask); 405 406 return error; 407 } 408 409 static void nfs_wake_up_inode(struct inode *inode) 410 { 411 struct nfs_inode *nfsi = NFS_I(inode); 412 413 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); 414 smp_mb__after_clear_bit(); 415 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); 416 } 417 418 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 419 { 420 struct inode *inode = dentry->d_inode; 421 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 422 int err; 423 424 /* Flush out writes to the server in order to update c/mtime */ 425 nfs_sync_mapping_range(inode->i_mapping, 0, 0, FLUSH_NOCOMMIT); 426 427 /* 428 * We may force a getattr if the user cares about atime. 429 * 430 * Note that we only have to check the vfsmount flags here: 431 * - NFS always sets S_NOATIME by so checking it would give a 432 * bogus result 433 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 434 * no point in checking those. 435 */ 436 if ((mnt->mnt_flags & MNT_NOATIME) || 437 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 438 need_atime = 0; 439 440 if (need_atime) 441 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 442 else 443 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 444 if (!err) 445 generic_fillattr(inode, stat); 446 return err; 447 } 448 449 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred) 450 { 451 struct nfs_open_context *ctx; 452 453 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 454 if (ctx != NULL) { 455 atomic_set(&ctx->count, 1); 456 ctx->dentry = dget(dentry); 457 ctx->vfsmnt = mntget(mnt); 458 ctx->cred = get_rpccred(cred); 459 ctx->state = NULL; 460 ctx->lockowner = current->files; 461 ctx->error = 0; 462 ctx->dir_cookie = 0; 463 } 464 return ctx; 465 } 466 467 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 468 { 469 if (ctx != NULL) 470 atomic_inc(&ctx->count); 471 return ctx; 472 } 473 474 void put_nfs_open_context(struct nfs_open_context *ctx) 475 { 476 if (atomic_dec_and_test(&ctx->count)) { 477 if (!list_empty(&ctx->list)) { 478 struct inode *inode = ctx->dentry->d_inode; 479 spin_lock(&inode->i_lock); 480 list_del(&ctx->list); 481 spin_unlock(&inode->i_lock); 482 } 483 if (ctx->state != NULL) 484 nfs4_close_state(ctx->state, ctx->mode); 485 if (ctx->cred != NULL) 486 put_rpccred(ctx->cred); 487 dput(ctx->dentry); 488 mntput(ctx->vfsmnt); 489 kfree(ctx); 490 } 491 } 492 493 /* 494 * Ensure that mmap has a recent RPC credential for use when writing out 495 * shared pages 496 */ 497 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 498 { 499 struct inode *inode = filp->f_path.dentry->d_inode; 500 struct nfs_inode *nfsi = NFS_I(inode); 501 502 filp->private_data = get_nfs_open_context(ctx); 503 spin_lock(&inode->i_lock); 504 list_add(&ctx->list, &nfsi->open_files); 505 spin_unlock(&inode->i_lock); 506 } 507 508 /* 509 * Given an inode, search for an open context with the desired characteristics 510 */ 511 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode) 512 { 513 struct nfs_inode *nfsi = NFS_I(inode); 514 struct nfs_open_context *pos, *ctx = NULL; 515 516 spin_lock(&inode->i_lock); 517 list_for_each_entry(pos, &nfsi->open_files, list) { 518 if (cred != NULL && pos->cred != cred) 519 continue; 520 if ((pos->mode & mode) == mode) { 521 ctx = get_nfs_open_context(pos); 522 break; 523 } 524 } 525 spin_unlock(&inode->i_lock); 526 return ctx; 527 } 528 529 static void nfs_file_clear_open_context(struct file *filp) 530 { 531 struct inode *inode = filp->f_path.dentry->d_inode; 532 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; 533 534 if (ctx) { 535 filp->private_data = NULL; 536 spin_lock(&inode->i_lock); 537 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 538 spin_unlock(&inode->i_lock); 539 put_nfs_open_context(ctx); 540 } 541 } 542 543 /* 544 * These allocate and release file read/write context information. 545 */ 546 int nfs_open(struct inode *inode, struct file *filp) 547 { 548 struct nfs_open_context *ctx; 549 struct rpc_cred *cred; 550 551 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 552 if (IS_ERR(cred)) 553 return PTR_ERR(cred); 554 ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred); 555 put_rpccred(cred); 556 if (ctx == NULL) 557 return -ENOMEM; 558 ctx->mode = filp->f_mode; 559 nfs_file_set_open_context(filp, ctx); 560 put_nfs_open_context(ctx); 561 return 0; 562 } 563 564 int nfs_release(struct inode *inode, struct file *filp) 565 { 566 nfs_file_clear_open_context(filp); 567 return 0; 568 } 569 570 /* 571 * This function is called whenever some part of NFS notices that 572 * the cached attributes have to be refreshed. 573 */ 574 int 575 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 576 { 577 int status = -ESTALE; 578 struct nfs_fattr fattr; 579 struct nfs_inode *nfsi = NFS_I(inode); 580 581 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 582 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 583 584 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 585 lock_kernel(); 586 if (is_bad_inode(inode)) 587 goto out_nowait; 588 if (NFS_STALE(inode)) 589 goto out_nowait; 590 591 status = nfs_wait_on_inode(inode); 592 if (status < 0) 593 goto out; 594 if (NFS_STALE(inode)) { 595 status = -ESTALE; 596 /* Do we trust the cached ESTALE? */ 597 if (NFS_ATTRTIMEO(inode) != 0) { 598 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) { 599 /* no */ 600 } else 601 goto out; 602 } 603 } 604 605 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); 606 if (status != 0) { 607 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 608 inode->i_sb->s_id, 609 (long long)NFS_FILEID(inode), status); 610 if (status == -ESTALE) { 611 nfs_zap_caches(inode); 612 if (!S_ISDIR(inode->i_mode)) 613 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); 614 } 615 goto out; 616 } 617 618 spin_lock(&inode->i_lock); 619 status = nfs_update_inode(inode, &fattr); 620 if (status) { 621 spin_unlock(&inode->i_lock); 622 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 623 inode->i_sb->s_id, 624 (long long)NFS_FILEID(inode), status); 625 goto out; 626 } 627 spin_unlock(&inode->i_lock); 628 629 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 630 nfs_zap_acl_cache(inode); 631 632 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 633 inode->i_sb->s_id, 634 (long long)NFS_FILEID(inode)); 635 636 out: 637 nfs_wake_up_inode(inode); 638 639 out_nowait: 640 unlock_kernel(); 641 return status; 642 } 643 644 int nfs_attribute_timeout(struct inode *inode) 645 { 646 struct nfs_inode *nfsi = NFS_I(inode); 647 648 if (nfs_have_delegation(inode, FMODE_READ)) 649 return 0; 650 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); 651 } 652 653 /** 654 * nfs_revalidate_inode - Revalidate the inode attributes 655 * @server - pointer to nfs_server struct 656 * @inode - pointer to inode struct 657 * 658 * Updates inode attribute information by retrieving the data from the server. 659 */ 660 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 661 { 662 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) 663 && !nfs_attribute_timeout(inode)) 664 return NFS_STALE(inode) ? -ESTALE : 0; 665 return __nfs_revalidate_inode(server, inode); 666 } 667 668 static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) 669 { 670 struct nfs_inode *nfsi = NFS_I(inode); 671 672 if (mapping->nrpages != 0) { 673 int ret = invalidate_inode_pages2(mapping); 674 if (ret < 0) 675 return ret; 676 } 677 spin_lock(&inode->i_lock); 678 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 679 if (S_ISDIR(inode->i_mode)) { 680 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 681 /* This ensures we revalidate child dentries */ 682 nfsi->cache_change_attribute = jiffies; 683 } 684 spin_unlock(&inode->i_lock); 685 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 686 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 687 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 688 return 0; 689 } 690 691 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 692 { 693 int ret = 0; 694 695 mutex_lock(&inode->i_mutex); 696 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) { 697 ret = nfs_sync_mapping(mapping); 698 if (ret == 0) 699 ret = nfs_invalidate_mapping_nolock(inode, mapping); 700 } 701 mutex_unlock(&inode->i_mutex); 702 return ret; 703 } 704 705 /** 706 * nfs_revalidate_mapping_nolock - Revalidate the pagecache 707 * @inode - pointer to host inode 708 * @mapping - pointer to mapping 709 */ 710 int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) 711 { 712 struct nfs_inode *nfsi = NFS_I(inode); 713 int ret = 0; 714 715 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 716 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { 717 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 718 if (ret < 0) 719 goto out; 720 } 721 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 722 ret = nfs_invalidate_mapping_nolock(inode, mapping); 723 out: 724 return ret; 725 } 726 727 /** 728 * nfs_revalidate_mapping - Revalidate the pagecache 729 * @inode - pointer to host inode 730 * @mapping - pointer to mapping 731 * 732 * This version of the function will take the inode->i_mutex and attempt to 733 * flush out all dirty data if it needs to invalidate the page cache. 734 */ 735 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 736 { 737 struct nfs_inode *nfsi = NFS_I(inode); 738 int ret = 0; 739 740 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 741 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { 742 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 743 if (ret < 0) 744 goto out; 745 } 746 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 747 ret = nfs_invalidate_mapping(inode, mapping); 748 out: 749 return ret; 750 } 751 752 /** 753 * nfs_begin_data_update 754 * @inode - pointer to inode 755 * Declare that a set of operations will update file data on the server 756 */ 757 void nfs_begin_data_update(struct inode *inode) 758 { 759 atomic_inc(&NFS_I(inode)->data_updates); 760 } 761 762 /** 763 * nfs_end_data_update 764 * @inode - pointer to inode 765 * Declare end of the operations that will update file data 766 * This will mark the inode as immediately needing revalidation 767 * of its attribute cache. 768 */ 769 void nfs_end_data_update(struct inode *inode) 770 { 771 struct nfs_inode *nfsi = NFS_I(inode); 772 773 /* Directories: invalidate page cache */ 774 if (S_ISDIR(inode->i_mode)) { 775 spin_lock(&inode->i_lock); 776 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 777 spin_unlock(&inode->i_lock); 778 } 779 nfsi->cache_change_attribute = jiffies; 780 atomic_dec(&nfsi->data_updates); 781 } 782 783 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 784 { 785 struct nfs_inode *nfsi = NFS_I(inode); 786 787 /* If we have atomic WCC data, we may update some attributes */ 788 if ((fattr->valid & NFS_ATTR_WCC) != 0) { 789 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 790 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 791 nfsi->cache_change_attribute = jiffies; 792 } 793 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 794 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 795 nfsi->cache_change_attribute = jiffies; 796 } 797 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) { 798 inode->i_size = fattr->size; 799 nfsi->cache_change_attribute = jiffies; 800 } 801 } 802 } 803 804 /** 805 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 806 * @inode - pointer to inode 807 * @fattr - updated attributes 808 * 809 * Verifies the attribute cache. If we have just changed the attributes, 810 * so that fattr carries weak cache consistency data, then it may 811 * also update the ctime/mtime/change_attribute. 812 */ 813 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 814 { 815 struct nfs_inode *nfsi = NFS_I(inode); 816 loff_t cur_size, new_isize; 817 int data_unstable; 818 819 820 /* Has the inode gone and changed behind our back? */ 821 if (nfsi->fileid != fattr->fileid 822 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 823 return -EIO; 824 } 825 826 /* Are we in the process of updating data on the server? */ 827 data_unstable = nfs_caches_unstable(inode); 828 829 /* Do atomic weak cache consistency updates */ 830 nfs_wcc_update_inode(inode, fattr); 831 832 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && 833 nfsi->change_attr != fattr->change_attr) 834 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 835 836 /* Verify a few of the more important attributes */ 837 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) 838 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 839 840 cur_size = i_size_read(inode); 841 new_isize = nfs_size_to_loff_t(fattr->size); 842 if (cur_size != new_isize && nfsi->npages == 0) 843 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 844 845 /* Have any file permissions changed? */ 846 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) 847 || inode->i_uid != fattr->uid 848 || inode->i_gid != fattr->gid) 849 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 850 851 /* Has the link count changed? */ 852 if (inode->i_nlink != fattr->nlink) 853 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 854 855 if (!timespec_equal(&inode->i_atime, &fattr->atime)) 856 nfsi->cache_validity |= NFS_INO_INVALID_ATIME; 857 858 nfsi->read_cache_jiffies = fattr->time_start; 859 return 0; 860 } 861 862 /** 863 * nfs_refresh_inode - try to update the inode attribute cache 864 * @inode - pointer to inode 865 * @fattr - updated attributes 866 * 867 * Check that an RPC call that returned attributes has not overlapped with 868 * other recent updates of the inode metadata, then decide whether it is 869 * safe to do a full update of the inode attributes, or whether just to 870 * call nfs_check_inode_attributes. 871 */ 872 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 873 { 874 struct nfs_inode *nfsi = NFS_I(inode); 875 int status; 876 877 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 878 return 0; 879 spin_lock(&inode->i_lock); 880 if (time_after(fattr->time_start, nfsi->last_updated)) 881 status = nfs_update_inode(inode, fattr); 882 else 883 status = nfs_check_inode_attributes(inode, fattr); 884 885 spin_unlock(&inode->i_lock); 886 return status; 887 } 888 889 /** 890 * nfs_post_op_update_inode - try to update the inode attribute cache 891 * @inode - pointer to inode 892 * @fattr - updated attributes 893 * 894 * After an operation that has changed the inode metadata, mark the 895 * attribute cache as being invalid, then try to update it. 896 * 897 * NB: if the server didn't return any post op attributes, this 898 * function will force the retrieval of attributes before the next 899 * NFS request. Thus it should be used only for operations that 900 * are expected to change one or more attributes, to avoid 901 * unnecessary NFS requests and trips through nfs_update_inode(). 902 */ 903 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 904 { 905 struct nfs_inode *nfsi = NFS_I(inode); 906 int status = 0; 907 908 spin_lock(&inode->i_lock); 909 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) { 910 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 911 goto out; 912 } 913 status = nfs_update_inode(inode, fattr); 914 out: 915 spin_unlock(&inode->i_lock); 916 return status; 917 } 918 919 /* 920 * Many nfs protocol calls return the new file attributes after 921 * an operation. Here we update the inode to reflect the state 922 * of the server's inode. 923 * 924 * This is a bit tricky because we have to make sure all dirty pages 925 * have been sent off to the server before calling invalidate_inode_pages. 926 * To make sure no other process adds more write requests while we try 927 * our best to flush them, we make them sleep during the attribute refresh. 928 * 929 * A very similar scenario holds for the dir cache. 930 */ 931 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 932 { 933 struct nfs_server *server; 934 struct nfs_inode *nfsi = NFS_I(inode); 935 loff_t cur_isize, new_isize; 936 unsigned int invalid = 0; 937 int data_stable; 938 939 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 940 __FUNCTION__, inode->i_sb->s_id, inode->i_ino, 941 atomic_read(&inode->i_count), fattr->valid); 942 943 if (nfsi->fileid != fattr->fileid) 944 goto out_fileid; 945 946 /* 947 * Make sure the inode's type hasn't changed. 948 */ 949 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 950 goto out_changed; 951 952 server = NFS_SERVER(inode); 953 /* Update the fsid if and only if this is the root directory */ 954 if (inode == inode->i_sb->s_root->d_inode 955 && !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 956 server->fsid = fattr->fsid; 957 958 /* 959 * Update the read time so we don't revalidate too often. 960 */ 961 nfsi->read_cache_jiffies = fattr->time_start; 962 nfsi->last_updated = jiffies; 963 964 /* Are we racing with known updates of the metadata on the server? */ 965 data_stable = nfs_verify_change_attribute(inode, fattr->time_start); 966 if (data_stable) 967 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME); 968 969 /* Do atomic weak cache consistency updates */ 970 nfs_wcc_update_inode(inode, fattr); 971 972 /* Check if our cached file size is stale */ 973 new_isize = nfs_size_to_loff_t(fattr->size); 974 cur_isize = i_size_read(inode); 975 if (new_isize != cur_isize) { 976 /* Do we perhaps have any outstanding writes? */ 977 if (nfsi->npages == 0) { 978 /* No, but did we race with nfs_end_data_update()? */ 979 if (data_stable) { 980 inode->i_size = new_isize; 981 invalid |= NFS_INO_INVALID_DATA; 982 } 983 invalid |= NFS_INO_INVALID_ATTR; 984 } else if (new_isize > cur_isize) { 985 inode->i_size = new_isize; 986 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 987 } 988 nfsi->cache_change_attribute = jiffies; 989 dprintk("NFS: isize change on server for file %s/%ld\n", 990 inode->i_sb->s_id, inode->i_ino); 991 } 992 993 /* Check if the mtime agrees */ 994 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 995 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 996 dprintk("NFS: mtime change on server for file %s/%ld\n", 997 inode->i_sb->s_id, inode->i_ino); 998 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 999 nfsi->cache_change_attribute = jiffies; 1000 } 1001 1002 /* If ctime has changed we should definitely clear access+acl caches */ 1003 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { 1004 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1005 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1006 nfsi->cache_change_attribute = jiffies; 1007 } 1008 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1009 1010 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || 1011 inode->i_uid != fattr->uid || 1012 inode->i_gid != fattr->gid) 1013 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1014 1015 inode->i_mode = fattr->mode; 1016 inode->i_nlink = fattr->nlink; 1017 inode->i_uid = fattr->uid; 1018 inode->i_gid = fattr->gid; 1019 1020 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 1021 /* 1022 * report the blocks in 512byte units 1023 */ 1024 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1025 } else { 1026 inode->i_blocks = fattr->du.nfs2.blocks; 1027 } 1028 1029 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && 1030 nfsi->change_attr != fattr->change_attr) { 1031 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1032 inode->i_sb->s_id, inode->i_ino); 1033 nfsi->change_attr = fattr->change_attr; 1034 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1035 nfsi->cache_change_attribute = jiffies; 1036 } 1037 1038 /* Update attrtimeo value if we're out of the unstable period */ 1039 if (invalid & NFS_INO_INVALID_ATTR) { 1040 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1041 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1042 nfsi->attrtimeo_timestamp = jiffies; 1043 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { 1044 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1045 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1046 nfsi->attrtimeo_timestamp = jiffies; 1047 } 1048 /* Don't invalidate the data if we were to blame */ 1049 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1050 || S_ISLNK(inode->i_mode))) 1051 invalid &= ~NFS_INO_INVALID_DATA; 1052 if (data_stable) 1053 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE); 1054 if (!nfs_have_delegation(inode, FMODE_READ)) 1055 nfsi->cache_validity |= invalid; 1056 1057 return 0; 1058 out_changed: 1059 /* 1060 * Big trouble! The inode has become a different object. 1061 */ 1062 #ifdef NFS_PARANOIA 1063 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1064 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); 1065 #endif 1066 out_err: 1067 /* 1068 * No need to worry about unhashing the dentry, as the 1069 * lookup validation will know that the inode is bad. 1070 * (But we fall through to invalidate the caches.) 1071 */ 1072 nfs_invalidate_inode(inode); 1073 return -ESTALE; 1074 1075 out_fileid: 1076 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1077 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1078 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, 1079 (long long)nfsi->fileid, (long long)fattr->fileid); 1080 goto out_err; 1081 } 1082 1083 1084 #ifdef CONFIG_NFS_V4 1085 1086 /* 1087 * Clean out any remaining NFSv4 state that might be left over due 1088 * to open() calls that passed nfs_atomic_lookup, but failed to call 1089 * nfs_open(). 1090 */ 1091 void nfs4_clear_inode(struct inode *inode) 1092 { 1093 struct nfs_inode *nfsi = NFS_I(inode); 1094 1095 /* If we are holding a delegation, return it! */ 1096 nfs_inode_return_delegation(inode); 1097 /* First call standard NFS clear_inode() code */ 1098 nfs_clear_inode(inode); 1099 /* Now clear out any remaining state */ 1100 while (!list_empty(&nfsi->open_states)) { 1101 struct nfs4_state *state; 1102 1103 state = list_entry(nfsi->open_states.next, 1104 struct nfs4_state, 1105 inode_states); 1106 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", 1107 __FUNCTION__, 1108 inode->i_sb->s_id, 1109 (long long)NFS_FILEID(inode), 1110 state); 1111 BUG_ON(atomic_read(&state->count) != 1); 1112 nfs4_close_state(state, state->state); 1113 } 1114 } 1115 #endif 1116 1117 struct inode *nfs_alloc_inode(struct super_block *sb) 1118 { 1119 struct nfs_inode *nfsi; 1120 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1121 if (!nfsi) 1122 return NULL; 1123 nfsi->flags = 0UL; 1124 nfsi->cache_validity = 0UL; 1125 nfsi->cache_change_attribute = jiffies; 1126 #ifdef CONFIG_NFS_V3_ACL 1127 nfsi->acl_access = ERR_PTR(-EAGAIN); 1128 nfsi->acl_default = ERR_PTR(-EAGAIN); 1129 #endif 1130 #ifdef CONFIG_NFS_V4 1131 nfsi->nfs4_acl = NULL; 1132 #endif /* CONFIG_NFS_V4 */ 1133 return &nfsi->vfs_inode; 1134 } 1135 1136 void nfs_destroy_inode(struct inode *inode) 1137 { 1138 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1139 } 1140 1141 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1142 { 1143 #ifdef CONFIG_NFS_V4 1144 INIT_LIST_HEAD(&nfsi->open_states); 1145 nfsi->delegation = NULL; 1146 nfsi->delegation_state = 0; 1147 init_rwsem(&nfsi->rwsem); 1148 #endif 1149 } 1150 1151 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) 1152 { 1153 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1154 1155 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 1156 SLAB_CTOR_CONSTRUCTOR) { 1157 inode_init_once(&nfsi->vfs_inode); 1158 spin_lock_init(&nfsi->req_lock); 1159 INIT_LIST_HEAD(&nfsi->dirty); 1160 INIT_LIST_HEAD(&nfsi->commit); 1161 INIT_LIST_HEAD(&nfsi->open_files); 1162 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1163 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1164 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1165 atomic_set(&nfsi->data_updates, 0); 1166 nfsi->ndirty = 0; 1167 nfsi->ncommit = 0; 1168 nfsi->npages = 0; 1169 nfs4_init_once(nfsi); 1170 } 1171 } 1172 1173 static int __init nfs_init_inodecache(void) 1174 { 1175 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1176 sizeof(struct nfs_inode), 1177 0, (SLAB_RECLAIM_ACCOUNT| 1178 SLAB_MEM_SPREAD), 1179 init_once, NULL); 1180 if (nfs_inode_cachep == NULL) 1181 return -ENOMEM; 1182 1183 return 0; 1184 } 1185 1186 static void nfs_destroy_inodecache(void) 1187 { 1188 kmem_cache_destroy(nfs_inode_cachep); 1189 } 1190 1191 /* 1192 * Initialize NFS 1193 */ 1194 static int __init init_nfs_fs(void) 1195 { 1196 int err; 1197 1198 err = nfs_fs_proc_init(); 1199 if (err) 1200 goto out5; 1201 1202 err = nfs_init_nfspagecache(); 1203 if (err) 1204 goto out4; 1205 1206 err = nfs_init_inodecache(); 1207 if (err) 1208 goto out3; 1209 1210 err = nfs_init_readpagecache(); 1211 if (err) 1212 goto out2; 1213 1214 err = nfs_init_writepagecache(); 1215 if (err) 1216 goto out1; 1217 1218 err = nfs_init_directcache(); 1219 if (err) 1220 goto out0; 1221 1222 #ifdef CONFIG_PROC_FS 1223 rpc_proc_register(&nfs_rpcstat); 1224 #endif 1225 if ((err = register_nfs_fs()) != 0) 1226 goto out; 1227 return 0; 1228 out: 1229 #ifdef CONFIG_PROC_FS 1230 rpc_proc_unregister("nfs"); 1231 #endif 1232 nfs_destroy_directcache(); 1233 out0: 1234 nfs_destroy_writepagecache(); 1235 out1: 1236 nfs_destroy_readpagecache(); 1237 out2: 1238 nfs_destroy_inodecache(); 1239 out3: 1240 nfs_destroy_nfspagecache(); 1241 out4: 1242 nfs_fs_proc_exit(); 1243 out5: 1244 return err; 1245 } 1246 1247 static void __exit exit_nfs_fs(void) 1248 { 1249 nfs_destroy_directcache(); 1250 nfs_destroy_writepagecache(); 1251 nfs_destroy_readpagecache(); 1252 nfs_destroy_inodecache(); 1253 nfs_destroy_nfspagecache(); 1254 #ifdef CONFIG_PROC_FS 1255 rpc_proc_unregister("nfs"); 1256 #endif 1257 unregister_nfs_fs(); 1258 nfs_fs_proc_exit(); 1259 } 1260 1261 /* Not quite true; I just maintain it */ 1262 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1263 MODULE_LICENSE("GPL"); 1264 1265 module_init(init_nfs_fs) 1266 module_exit(exit_nfs_fs) 1267