1 /* 2 * linux/fs/nfs/inode.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs inode and superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/sched.h> 19 #include <linux/time.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/string.h> 23 #include <linux/stat.h> 24 #include <linux/errno.h> 25 #include <linux/unistd.h> 26 #include <linux/sunrpc/clnt.h> 27 #include <linux/sunrpc/stats.h> 28 #include <linux/sunrpc/metrics.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/slab.h> 39 #include <linux/compat.h> 40 #include <linux/freezer.h> 41 #include <linux/crc32.h> 42 43 #include <asm/uaccess.h> 44 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "dns_resolve.h" 52 #include "pnfs.h" 53 #include "nfs.h" 54 #include "netns.h" 55 56 #define NFSDBG_FACILITY NFSDBG_VFS 57 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 59 60 /* Default is to see 64-bit inode numbers */ 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 62 63 static void nfs_invalidate_inode(struct inode *); 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 65 66 static struct kmem_cache * nfs_inode_cachep; 67 68 static inline unsigned long 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 70 { 71 return nfs_fileid_to_ino_t(fattr->fileid); 72 } 73 74 /** 75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks 76 * @word: long word containing the bit lock 77 */ 78 int nfs_wait_bit_killable(void *word) 79 { 80 if (fatal_signal_pending(current)) 81 return -ERESTARTSYS; 82 freezable_schedule(); 83 return 0; 84 } 85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); 86 87 /** 88 * nfs_compat_user_ino64 - returns the user-visible inode number 89 * @fileid: 64-bit fileid 90 * 91 * This function returns a 32-bit inode number if the boot parameter 92 * nfs.enable_ino64 is zero. 93 */ 94 u64 nfs_compat_user_ino64(u64 fileid) 95 { 96 #ifdef CONFIG_COMPAT 97 compat_ulong_t ino; 98 #else 99 unsigned long ino; 100 #endif 101 102 if (enable_ino64) 103 return fileid; 104 ino = fileid; 105 if (sizeof(ino) < sizeof(fileid)) 106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 107 return ino; 108 } 109 110 int nfs_drop_inode(struct inode *inode) 111 { 112 return NFS_STALE(inode) || generic_drop_inode(inode); 113 } 114 EXPORT_SYMBOL_GPL(nfs_drop_inode); 115 116 void nfs_clear_inode(struct inode *inode) 117 { 118 /* 119 * The following should never happen... 120 */ 121 WARN_ON_ONCE(nfs_have_writebacks(inode)); 122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); 123 nfs_zap_acl_cache(inode); 124 nfs_access_zap_cache(inode); 125 nfs_fscache_release_inode_cookie(inode); 126 } 127 EXPORT_SYMBOL_GPL(nfs_clear_inode); 128 129 void nfs_evict_inode(struct inode *inode) 130 { 131 truncate_inode_pages(&inode->i_data, 0); 132 clear_inode(inode); 133 nfs_clear_inode(inode); 134 } 135 136 /** 137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 138 */ 139 int nfs_sync_mapping(struct address_space *mapping) 140 { 141 int ret = 0; 142 143 if (mapping->nrpages != 0) { 144 unmap_mapping_range(mapping, 0, 0, 0); 145 ret = nfs_wb_all(mapping->host); 146 } 147 return ret; 148 } 149 150 /* 151 * Invalidate the local caches 152 */ 153 static void nfs_zap_caches_locked(struct inode *inode) 154 { 155 struct nfs_inode *nfsi = NFS_I(inode); 156 int mode = inode->i_mode; 157 158 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 159 160 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 161 nfsi->attrtimeo_timestamp = jiffies; 162 163 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); 164 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { 165 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 166 nfs_fscache_invalidate(inode); 167 } else { 168 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 169 } 170 } 171 172 void nfs_zap_caches(struct inode *inode) 173 { 174 spin_lock(&inode->i_lock); 175 nfs_zap_caches_locked(inode); 176 spin_unlock(&inode->i_lock); 177 } 178 179 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 180 { 181 if (mapping->nrpages != 0) { 182 spin_lock(&inode->i_lock); 183 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 184 nfs_fscache_invalidate(inode); 185 spin_unlock(&inode->i_lock); 186 } 187 } 188 189 void nfs_zap_acl_cache(struct inode *inode) 190 { 191 void (*clear_acl_cache)(struct inode *); 192 193 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 194 if (clear_acl_cache != NULL) 195 clear_acl_cache(inode); 196 spin_lock(&inode->i_lock); 197 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 198 spin_unlock(&inode->i_lock); 199 } 200 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 201 202 void nfs_invalidate_atime(struct inode *inode) 203 { 204 spin_lock(&inode->i_lock); 205 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; 206 spin_unlock(&inode->i_lock); 207 } 208 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 209 210 /* 211 * Invalidate, but do not unhash, the inode. 212 * NB: must be called with inode->i_lock held! 213 */ 214 static void nfs_invalidate_inode(struct inode *inode) 215 { 216 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 217 nfs_zap_caches_locked(inode); 218 } 219 220 struct nfs_find_desc { 221 struct nfs_fh *fh; 222 struct nfs_fattr *fattr; 223 }; 224 225 /* 226 * In NFSv3 we can have 64bit inode numbers. In order to support 227 * this, and re-exported directories (also seen in NFSv2) 228 * we are forced to allow 2 different inodes to have the same 229 * i_ino. 230 */ 231 static int 232 nfs_find_actor(struct inode *inode, void *opaque) 233 { 234 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 235 struct nfs_fh *fh = desc->fh; 236 struct nfs_fattr *fattr = desc->fattr; 237 238 if (NFS_FILEID(inode) != fattr->fileid) 239 return 0; 240 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 241 return 0; 242 if (nfs_compare_fh(NFS_FH(inode), fh)) 243 return 0; 244 if (is_bad_inode(inode) || NFS_STALE(inode)) 245 return 0; 246 return 1; 247 } 248 249 static int 250 nfs_init_locked(struct inode *inode, void *opaque) 251 { 252 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 253 struct nfs_fattr *fattr = desc->fattr; 254 255 set_nfs_fileid(inode, fattr->fileid); 256 nfs_copy_fh(NFS_FH(inode), desc->fh); 257 return 0; 258 } 259 260 /* 261 * This is our front-end to iget that looks up inodes by file handle 262 * instead of inode number. 263 */ 264 struct inode * 265 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 266 { 267 struct nfs_find_desc desc = { 268 .fh = fh, 269 .fattr = fattr 270 }; 271 struct inode *inode = ERR_PTR(-ENOENT); 272 unsigned long hash; 273 274 nfs_attr_check_mountpoint(sb, fattr); 275 276 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) && 277 !nfs_attr_use_mounted_on_fileid(fattr)) 278 goto out_no_inode; 279 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 280 goto out_no_inode; 281 282 hash = nfs_fattr_to_ino_t(fattr); 283 284 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 285 if (inode == NULL) { 286 inode = ERR_PTR(-ENOMEM); 287 goto out_no_inode; 288 } 289 290 if (inode->i_state & I_NEW) { 291 struct nfs_inode *nfsi = NFS_I(inode); 292 unsigned long now = jiffies; 293 294 /* We set i_ino for the few things that still rely on it, 295 * such as stat(2) */ 296 inode->i_ino = hash; 297 298 /* We can't support update_atime(), since the server will reset it */ 299 inode->i_flags |= S_NOATIME|S_NOCMTIME; 300 inode->i_mode = fattr->mode; 301 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 302 && nfs_server_capable(inode, NFS_CAP_MODE)) 303 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 304 /* Why so? Because we want revalidate for devices/FIFOs, and 305 * that's precisely what we have in nfs_file_inode_operations. 306 */ 307 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 308 if (S_ISREG(inode->i_mode)) { 309 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 310 inode->i_data.a_ops = &nfs_file_aops; 311 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 312 } else if (S_ISDIR(inode->i_mode)) { 313 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 314 inode->i_fop = &nfs_dir_operations; 315 inode->i_data.a_ops = &nfs_dir_aops; 316 /* Deal with crossing mountpoints */ 317 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 318 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 319 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 320 inode->i_op = &nfs_referral_inode_operations; 321 else 322 inode->i_op = &nfs_mountpoint_inode_operations; 323 inode->i_fop = NULL; 324 inode->i_flags |= S_AUTOMOUNT; 325 } 326 } else if (S_ISLNK(inode->i_mode)) 327 inode->i_op = &nfs_symlink_inode_operations; 328 else 329 init_special_inode(inode, inode->i_mode, fattr->rdev); 330 331 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 332 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 333 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 334 inode->i_version = 0; 335 inode->i_size = 0; 336 clear_nlink(inode); 337 inode->i_uid = make_kuid(&init_user_ns, -2); 338 inode->i_gid = make_kgid(&init_user_ns, -2); 339 inode->i_blocks = 0; 340 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 341 nfsi->write_io = 0; 342 nfsi->read_io = 0; 343 344 nfsi->read_cache_jiffies = fattr->time_start; 345 nfsi->attr_gencount = fattr->gencount; 346 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 347 inode->i_atime = fattr->atime; 348 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 349 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 350 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 351 inode->i_mtime = fattr->mtime; 352 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 353 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 354 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 355 inode->i_ctime = fattr->ctime; 356 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 357 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 358 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 359 inode->i_version = fattr->change_attr; 360 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) 361 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 362 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 363 inode->i_size = nfs_size_to_loff_t(fattr->size); 364 else 365 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 366 | NFS_INO_REVAL_PAGECACHE; 367 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 368 set_nlink(inode, fattr->nlink); 369 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 370 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 371 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 372 inode->i_uid = fattr->uid; 373 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 374 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 375 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 376 inode->i_gid = fattr->gid; 377 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 378 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 379 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 380 inode->i_blocks = fattr->du.nfs2.blocks; 381 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 382 /* 383 * report the blocks in 512byte units 384 */ 385 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 386 } 387 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 388 nfsi->attrtimeo_timestamp = now; 389 nfsi->access_cache = RB_ROOT; 390 391 nfs_fscache_init_inode_cookie(inode); 392 393 unlock_new_inode(inode); 394 } else 395 nfs_refresh_inode(inode, fattr); 396 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n", 397 inode->i_sb->s_id, 398 (long long)NFS_FILEID(inode), 399 nfs_display_fhandle_hash(fh), 400 atomic_read(&inode->i_count)); 401 402 out: 403 return inode; 404 405 out_no_inode: 406 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 407 goto out; 408 } 409 EXPORT_SYMBOL_GPL(nfs_fhget); 410 411 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN) 412 413 int 414 nfs_setattr(struct dentry *dentry, struct iattr *attr) 415 { 416 struct inode *inode = dentry->d_inode; 417 struct nfs_fattr *fattr; 418 int error = -ENOMEM; 419 420 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 421 422 /* skip mode change if it's just for clearing setuid/setgid */ 423 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 424 attr->ia_valid &= ~ATTR_MODE; 425 426 if (attr->ia_valid & ATTR_SIZE) { 427 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 428 attr->ia_valid &= ~ATTR_SIZE; 429 } 430 431 /* Optimization: if the end result is no change, don't RPC */ 432 attr->ia_valid &= NFS_VALID_ATTRS; 433 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 434 return 0; 435 436 /* Write all dirty data */ 437 if (S_ISREG(inode->i_mode)) { 438 nfs_inode_dio_wait(inode); 439 nfs_wb_all(inode); 440 } 441 442 fattr = nfs_alloc_fattr(); 443 if (fattr == NULL) 444 goto out; 445 /* 446 * Return any delegations if we're going to change ACLs 447 */ 448 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 449 NFS_PROTO(inode)->return_delegation(inode); 450 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 451 if (error == 0) 452 nfs_refresh_inode(inode, fattr); 453 nfs_free_fattr(fattr); 454 out: 455 return error; 456 } 457 EXPORT_SYMBOL_GPL(nfs_setattr); 458 459 /** 460 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 461 * @inode: inode of the file used 462 * @offset: file offset to start truncating 463 * 464 * This is a copy of the common vmtruncate, but with the locking 465 * corrected to take into account the fact that NFS requires 466 * inode->i_size to be updated under the inode->i_lock. 467 */ 468 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 469 { 470 loff_t oldsize; 471 int err; 472 473 err = inode_newsize_ok(inode, offset); 474 if (err) 475 goto out; 476 477 spin_lock(&inode->i_lock); 478 oldsize = inode->i_size; 479 i_size_write(inode, offset); 480 spin_unlock(&inode->i_lock); 481 482 truncate_pagecache(inode, oldsize, offset); 483 out: 484 return err; 485 } 486 487 /** 488 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 489 * @inode: pointer to struct inode 490 * @attr: pointer to struct iattr 491 * 492 * Note: we do this in the *proc.c in order to ensure that 493 * it works for things like exclusive creates too. 494 */ 495 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 496 { 497 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 498 spin_lock(&inode->i_lock); 499 if ((attr->ia_valid & ATTR_MODE) != 0) { 500 int mode = attr->ia_mode & S_IALLUGO; 501 mode |= inode->i_mode & ~S_IALLUGO; 502 inode->i_mode = mode; 503 } 504 if ((attr->ia_valid & ATTR_UID) != 0) 505 inode->i_uid = attr->ia_uid; 506 if ((attr->ia_valid & ATTR_GID) != 0) 507 inode->i_gid = attr->ia_gid; 508 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 509 spin_unlock(&inode->i_lock); 510 } 511 if ((attr->ia_valid & ATTR_SIZE) != 0) { 512 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 513 nfs_vmtruncate(inode, attr->ia_size); 514 } 515 } 516 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 517 518 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 519 { 520 struct inode *inode = dentry->d_inode; 521 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 522 int err; 523 524 /* Flush out writes to the server in order to update c/mtime. */ 525 if (S_ISREG(inode->i_mode)) { 526 nfs_inode_dio_wait(inode); 527 err = filemap_write_and_wait(inode->i_mapping); 528 if (err) 529 goto out; 530 } 531 532 /* 533 * We may force a getattr if the user cares about atime. 534 * 535 * Note that we only have to check the vfsmount flags here: 536 * - NFS always sets S_NOATIME by so checking it would give a 537 * bogus result 538 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 539 * no point in checking those. 540 */ 541 if ((mnt->mnt_flags & MNT_NOATIME) || 542 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 543 need_atime = 0; 544 545 if (need_atime) 546 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 547 else 548 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 549 if (!err) { 550 generic_fillattr(inode, stat); 551 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 552 } 553 out: 554 return err; 555 } 556 EXPORT_SYMBOL_GPL(nfs_getattr); 557 558 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 559 { 560 atomic_set(&l_ctx->count, 1); 561 l_ctx->lockowner.l_owner = current->files; 562 l_ctx->lockowner.l_pid = current->tgid; 563 INIT_LIST_HEAD(&l_ctx->list); 564 nfs_iocounter_init(&l_ctx->io_count); 565 } 566 567 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 568 { 569 struct nfs_lock_context *head = &ctx->lock_context; 570 struct nfs_lock_context *pos = head; 571 572 do { 573 if (pos->lockowner.l_owner != current->files) 574 continue; 575 if (pos->lockowner.l_pid != current->tgid) 576 continue; 577 atomic_inc(&pos->count); 578 return pos; 579 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 580 return NULL; 581 } 582 583 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 584 { 585 struct nfs_lock_context *res, *new = NULL; 586 struct inode *inode = ctx->dentry->d_inode; 587 588 spin_lock(&inode->i_lock); 589 res = __nfs_find_lock_context(ctx); 590 if (res == NULL) { 591 spin_unlock(&inode->i_lock); 592 new = kmalloc(sizeof(*new), GFP_KERNEL); 593 if (new == NULL) 594 return ERR_PTR(-ENOMEM); 595 nfs_init_lock_context(new); 596 spin_lock(&inode->i_lock); 597 res = __nfs_find_lock_context(ctx); 598 if (res == NULL) { 599 list_add_tail(&new->list, &ctx->lock_context.list); 600 new->open_context = ctx; 601 res = new; 602 new = NULL; 603 } 604 } 605 spin_unlock(&inode->i_lock); 606 kfree(new); 607 return res; 608 } 609 610 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 611 { 612 struct nfs_open_context *ctx = l_ctx->open_context; 613 struct inode *inode = ctx->dentry->d_inode; 614 615 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 616 return; 617 list_del(&l_ctx->list); 618 spin_unlock(&inode->i_lock); 619 kfree(l_ctx); 620 } 621 622 /** 623 * nfs_close_context - Common close_context() routine NFSv2/v3 624 * @ctx: pointer to context 625 * @is_sync: is this a synchronous close 626 * 627 * always ensure that the attributes are up to date if we're mounted 628 * with close-to-open semantics 629 */ 630 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 631 { 632 struct inode *inode; 633 struct nfs_server *server; 634 635 if (!(ctx->mode & FMODE_WRITE)) 636 return; 637 if (!is_sync) 638 return; 639 inode = ctx->dentry->d_inode; 640 if (!list_empty(&NFS_I(inode)->open_files)) 641 return; 642 server = NFS_SERVER(inode); 643 if (server->flags & NFS_MOUNT_NOCTO) 644 return; 645 nfs_revalidate_inode(server, inode); 646 } 647 EXPORT_SYMBOL_GPL(nfs_close_context); 648 649 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 650 { 651 struct nfs_open_context *ctx; 652 struct rpc_cred *cred = rpc_lookup_cred(); 653 if (IS_ERR(cred)) 654 return ERR_CAST(cred); 655 656 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 657 if (!ctx) { 658 put_rpccred(cred); 659 return ERR_PTR(-ENOMEM); 660 } 661 nfs_sb_active(dentry->d_sb); 662 ctx->dentry = dget(dentry); 663 ctx->cred = cred; 664 ctx->state = NULL; 665 ctx->mode = f_mode; 666 ctx->flags = 0; 667 ctx->error = 0; 668 nfs_init_lock_context(&ctx->lock_context); 669 ctx->lock_context.open_context = ctx; 670 INIT_LIST_HEAD(&ctx->list); 671 ctx->mdsthreshold = NULL; 672 return ctx; 673 } 674 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 675 676 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 677 { 678 if (ctx != NULL) 679 atomic_inc(&ctx->lock_context.count); 680 return ctx; 681 } 682 EXPORT_SYMBOL_GPL(get_nfs_open_context); 683 684 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 685 { 686 struct inode *inode = ctx->dentry->d_inode; 687 struct super_block *sb = ctx->dentry->d_sb; 688 689 if (!list_empty(&ctx->list)) { 690 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 691 return; 692 list_del(&ctx->list); 693 spin_unlock(&inode->i_lock); 694 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 695 return; 696 if (inode != NULL) 697 NFS_PROTO(inode)->close_context(ctx, is_sync); 698 if (ctx->cred != NULL) 699 put_rpccred(ctx->cred); 700 dput(ctx->dentry); 701 nfs_sb_deactive(sb); 702 kfree(ctx->mdsthreshold); 703 kfree(ctx); 704 } 705 706 void put_nfs_open_context(struct nfs_open_context *ctx) 707 { 708 __put_nfs_open_context(ctx, 0); 709 } 710 EXPORT_SYMBOL_GPL(put_nfs_open_context); 711 712 /* 713 * Ensure that mmap has a recent RPC credential for use when writing out 714 * shared pages 715 */ 716 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 717 { 718 struct inode *inode = file_inode(filp); 719 struct nfs_inode *nfsi = NFS_I(inode); 720 721 filp->private_data = get_nfs_open_context(ctx); 722 spin_lock(&inode->i_lock); 723 list_add(&ctx->list, &nfsi->open_files); 724 spin_unlock(&inode->i_lock); 725 } 726 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 727 728 /* 729 * Given an inode, search for an open context with the desired characteristics 730 */ 731 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 732 { 733 struct nfs_inode *nfsi = NFS_I(inode); 734 struct nfs_open_context *pos, *ctx = NULL; 735 736 spin_lock(&inode->i_lock); 737 list_for_each_entry(pos, &nfsi->open_files, list) { 738 if (cred != NULL && pos->cred != cred) 739 continue; 740 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 741 continue; 742 ctx = get_nfs_open_context(pos); 743 break; 744 } 745 spin_unlock(&inode->i_lock); 746 return ctx; 747 } 748 749 static void nfs_file_clear_open_context(struct file *filp) 750 { 751 struct inode *inode = file_inode(filp); 752 struct nfs_open_context *ctx = nfs_file_open_context(filp); 753 754 if (ctx) { 755 filp->private_data = NULL; 756 spin_lock(&inode->i_lock); 757 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 758 spin_unlock(&inode->i_lock); 759 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 760 } 761 } 762 763 /* 764 * These allocate and release file read/write context information. 765 */ 766 int nfs_open(struct inode *inode, struct file *filp) 767 { 768 struct nfs_open_context *ctx; 769 770 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 771 if (IS_ERR(ctx)) 772 return PTR_ERR(ctx); 773 nfs_file_set_open_context(filp, ctx); 774 put_nfs_open_context(ctx); 775 nfs_fscache_set_inode_cookie(inode, filp); 776 return 0; 777 } 778 779 int nfs_release(struct inode *inode, struct file *filp) 780 { 781 nfs_file_clear_open_context(filp); 782 return 0; 783 } 784 785 /* 786 * This function is called whenever some part of NFS notices that 787 * the cached attributes have to be refreshed. 788 */ 789 int 790 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 791 { 792 int status = -ESTALE; 793 struct nfs_fattr *fattr = NULL; 794 struct nfs_inode *nfsi = NFS_I(inode); 795 796 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 797 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 798 799 if (is_bad_inode(inode)) 800 goto out; 801 if (NFS_STALE(inode)) 802 goto out; 803 804 status = -ENOMEM; 805 fattr = nfs_alloc_fattr(); 806 if (fattr == NULL) 807 goto out; 808 809 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 810 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr); 811 if (status != 0) { 812 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 813 inode->i_sb->s_id, 814 (long long)NFS_FILEID(inode), status); 815 if (status == -ESTALE) { 816 nfs_zap_caches(inode); 817 if (!S_ISDIR(inode->i_mode)) 818 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 819 } 820 goto out; 821 } 822 823 status = nfs_refresh_inode(inode, fattr); 824 if (status) { 825 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 826 inode->i_sb->s_id, 827 (long long)NFS_FILEID(inode), status); 828 goto out; 829 } 830 831 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 832 nfs_zap_acl_cache(inode); 833 834 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 835 inode->i_sb->s_id, 836 (long long)NFS_FILEID(inode)); 837 838 out: 839 nfs_free_fattr(fattr); 840 return status; 841 } 842 843 int nfs_attribute_timeout(struct inode *inode) 844 { 845 struct nfs_inode *nfsi = NFS_I(inode); 846 847 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 848 } 849 850 static int nfs_attribute_cache_expired(struct inode *inode) 851 { 852 if (nfs_have_delegated_attributes(inode)) 853 return 0; 854 return nfs_attribute_timeout(inode); 855 } 856 857 /** 858 * nfs_revalidate_inode - Revalidate the inode attributes 859 * @server - pointer to nfs_server struct 860 * @inode - pointer to inode struct 861 * 862 * Updates inode attribute information by retrieving the data from the server. 863 */ 864 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 865 { 866 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) 867 && !nfs_attribute_cache_expired(inode)) 868 return NFS_STALE(inode) ? -ESTALE : 0; 869 return __nfs_revalidate_inode(server, inode); 870 } 871 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 872 873 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 874 { 875 struct nfs_inode *nfsi = NFS_I(inode); 876 877 if (mapping->nrpages != 0) { 878 int ret = invalidate_inode_pages2(mapping); 879 if (ret < 0) 880 return ret; 881 } 882 spin_lock(&inode->i_lock); 883 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 884 if (S_ISDIR(inode->i_mode)) 885 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 886 spin_unlock(&inode->i_lock); 887 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 888 nfs_fscache_wait_on_invalidate(inode); 889 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 890 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 891 return 0; 892 } 893 894 static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 895 { 896 if (nfs_have_delegated_attributes(inode)) 897 return false; 898 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 899 || nfs_attribute_timeout(inode) 900 || NFS_STALE(inode); 901 } 902 903 /** 904 * nfs_revalidate_mapping - Revalidate the pagecache 905 * @inode - pointer to host inode 906 * @mapping - pointer to mapping 907 */ 908 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 909 { 910 struct nfs_inode *nfsi = NFS_I(inode); 911 int ret = 0; 912 913 /* swapfiles are not supposed to be shared. */ 914 if (IS_SWAPFILE(inode)) 915 goto out; 916 917 if (nfs_mapping_need_revalidate_inode(inode)) { 918 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 919 if (ret < 0) 920 goto out; 921 } 922 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 923 ret = nfs_invalidate_mapping(inode, mapping); 924 out: 925 return ret; 926 } 927 928 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 929 { 930 struct nfs_inode *nfsi = NFS_I(inode); 931 unsigned long ret = 0; 932 933 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 934 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 935 && inode->i_version == fattr->pre_change_attr) { 936 inode->i_version = fattr->change_attr; 937 if (S_ISDIR(inode->i_mode)) 938 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 939 ret |= NFS_INO_INVALID_ATTR; 940 } 941 /* If we have atomic WCC data, we may update some attributes */ 942 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 943 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 944 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 945 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 946 ret |= NFS_INO_INVALID_ATTR; 947 } 948 949 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 950 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 951 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 952 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 953 if (S_ISDIR(inode->i_mode)) 954 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 955 ret |= NFS_INO_INVALID_ATTR; 956 } 957 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 958 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 959 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 960 && nfsi->npages == 0) { 961 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 962 ret |= NFS_INO_INVALID_ATTR; 963 } 964 965 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 966 nfs_fscache_invalidate(inode); 967 968 return ret; 969 } 970 971 /** 972 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 973 * @inode - pointer to inode 974 * @fattr - updated attributes 975 * 976 * Verifies the attribute cache. If we have just changed the attributes, 977 * so that fattr carries weak cache consistency data, then it may 978 * also update the ctime/mtime/change_attribute. 979 */ 980 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 981 { 982 struct nfs_inode *nfsi = NFS_I(inode); 983 loff_t cur_size, new_isize; 984 unsigned long invalid = 0; 985 986 987 if (nfs_have_delegated_attributes(inode)) 988 return 0; 989 /* Has the inode gone and changed behind our back? */ 990 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 991 return -EIO; 992 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 993 return -EIO; 994 995 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 996 inode->i_version != fattr->change_attr) 997 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 998 999 /* Verify a few of the more important attributes */ 1000 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1001 invalid |= NFS_INO_INVALID_ATTR; 1002 1003 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1004 cur_size = i_size_read(inode); 1005 new_isize = nfs_size_to_loff_t(fattr->size); 1006 if (cur_size != new_isize && nfsi->npages == 0) 1007 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1008 } 1009 1010 /* Have any file permissions changed? */ 1011 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1012 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1013 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1014 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1015 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1016 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1017 1018 /* Has the link count changed? */ 1019 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1020 invalid |= NFS_INO_INVALID_ATTR; 1021 1022 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1023 invalid |= NFS_INO_INVALID_ATIME; 1024 1025 if (invalid != 0) 1026 nfsi->cache_validity |= invalid; 1027 1028 nfsi->read_cache_jiffies = fattr->time_start; 1029 return 0; 1030 } 1031 1032 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1033 { 1034 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 1035 return 0; 1036 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 1037 } 1038 1039 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1040 { 1041 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 1042 return 0; 1043 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 1044 } 1045 1046 static atomic_long_t nfs_attr_generation_counter; 1047 1048 static unsigned long nfs_read_attr_generation_counter(void) 1049 { 1050 return atomic_long_read(&nfs_attr_generation_counter); 1051 } 1052 1053 unsigned long nfs_inc_attr_generation_counter(void) 1054 { 1055 return atomic_long_inc_return(&nfs_attr_generation_counter); 1056 } 1057 1058 void nfs_fattr_init(struct nfs_fattr *fattr) 1059 { 1060 fattr->valid = 0; 1061 fattr->time_start = jiffies; 1062 fattr->gencount = nfs_inc_attr_generation_counter(); 1063 fattr->owner_name = NULL; 1064 fattr->group_name = NULL; 1065 } 1066 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1067 1068 struct nfs_fattr *nfs_alloc_fattr(void) 1069 { 1070 struct nfs_fattr *fattr; 1071 1072 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1073 if (fattr != NULL) 1074 nfs_fattr_init(fattr); 1075 return fattr; 1076 } 1077 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1078 1079 struct nfs_fh *nfs_alloc_fhandle(void) 1080 { 1081 struct nfs_fh *fh; 1082 1083 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1084 if (fh != NULL) 1085 fh->size = 0; 1086 return fh; 1087 } 1088 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1089 1090 #ifdef NFS_DEBUG 1091 /* 1092 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1093 * in the same way that wireshark does 1094 * 1095 * @fh: file handle 1096 * 1097 * For debugging only. 1098 */ 1099 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1100 { 1101 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1102 * not on the result */ 1103 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size); 1104 } 1105 1106 /* 1107 * _nfs_display_fhandle - display an NFS file handle on the console 1108 * 1109 * @fh: file handle to display 1110 * @caption: display caption 1111 * 1112 * For debugging only. 1113 */ 1114 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1115 { 1116 unsigned short i; 1117 1118 if (fh == NULL || fh->size == 0) { 1119 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1120 return; 1121 } 1122 1123 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1124 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1125 for (i = 0; i < fh->size; i += 16) { 1126 __be32 *pos = (__be32 *)&fh->data[i]; 1127 1128 switch ((fh->size - i - 1) >> 2) { 1129 case 0: 1130 printk(KERN_DEFAULT " %08x\n", 1131 be32_to_cpup(pos)); 1132 break; 1133 case 1: 1134 printk(KERN_DEFAULT " %08x %08x\n", 1135 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1136 break; 1137 case 2: 1138 printk(KERN_DEFAULT " %08x %08x %08x\n", 1139 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1140 be32_to_cpup(pos + 2)); 1141 break; 1142 default: 1143 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1144 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1145 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1146 } 1147 } 1148 } 1149 #endif 1150 1151 /** 1152 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1153 * @inode - pointer to inode 1154 * @fattr - attributes 1155 * 1156 * Attempt to divine whether or not an RPC call reply carrying stale 1157 * attributes got scheduled after another call carrying updated ones. 1158 * 1159 * To do so, the function first assumes that a more recent ctime means 1160 * that the attributes in fattr are newer, however it also attempt to 1161 * catch the case where ctime either didn't change, or went backwards 1162 * (if someone reset the clock on the server) by looking at whether 1163 * or not this RPC call was started after the inode was last updated. 1164 * Note also the check for wraparound of 'attr_gencount' 1165 * 1166 * The function returns 'true' if it thinks the attributes in 'fattr' are 1167 * more recent than the ones cached in the inode. 1168 * 1169 */ 1170 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1171 { 1172 const struct nfs_inode *nfsi = NFS_I(inode); 1173 1174 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1175 nfs_ctime_need_update(inode, fattr) || 1176 nfs_size_need_update(inode, fattr) || 1177 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1178 } 1179 1180 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1181 { 1182 if (nfs_inode_attrs_need_update(inode, fattr)) 1183 return nfs_update_inode(inode, fattr); 1184 return nfs_check_inode_attributes(inode, fattr); 1185 } 1186 1187 /** 1188 * nfs_refresh_inode - try to update the inode attribute cache 1189 * @inode - pointer to inode 1190 * @fattr - updated attributes 1191 * 1192 * Check that an RPC call that returned attributes has not overlapped with 1193 * other recent updates of the inode metadata, then decide whether it is 1194 * safe to do a full update of the inode attributes, or whether just to 1195 * call nfs_check_inode_attributes. 1196 */ 1197 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1198 { 1199 int status; 1200 1201 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1202 return 0; 1203 spin_lock(&inode->i_lock); 1204 status = nfs_refresh_inode_locked(inode, fattr); 1205 spin_unlock(&inode->i_lock); 1206 1207 return status; 1208 } 1209 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1210 1211 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1212 { 1213 struct nfs_inode *nfsi = NFS_I(inode); 1214 1215 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1216 if (S_ISDIR(inode->i_mode)) { 1217 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1218 nfs_fscache_invalidate(inode); 1219 } 1220 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1221 return 0; 1222 return nfs_refresh_inode_locked(inode, fattr); 1223 } 1224 1225 /** 1226 * nfs_post_op_update_inode - try to update the inode attribute cache 1227 * @inode - pointer to inode 1228 * @fattr - updated attributes 1229 * 1230 * After an operation that has changed the inode metadata, mark the 1231 * attribute cache as being invalid, then try to update it. 1232 * 1233 * NB: if the server didn't return any post op attributes, this 1234 * function will force the retrieval of attributes before the next 1235 * NFS request. Thus it should be used only for operations that 1236 * are expected to change one or more attributes, to avoid 1237 * unnecessary NFS requests and trips through nfs_update_inode(). 1238 */ 1239 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1240 { 1241 int status; 1242 1243 spin_lock(&inode->i_lock); 1244 status = nfs_post_op_update_inode_locked(inode, fattr); 1245 spin_unlock(&inode->i_lock); 1246 return status; 1247 } 1248 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1249 1250 /** 1251 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1252 * @inode - pointer to inode 1253 * @fattr - updated attributes 1254 * 1255 * After an operation that has changed the inode metadata, mark the 1256 * attribute cache as being invalid, then try to update it. Fake up 1257 * weak cache consistency data, if none exist. 1258 * 1259 * This function is mainly designed to be used by the ->write_done() functions. 1260 */ 1261 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1262 { 1263 int status; 1264 1265 spin_lock(&inode->i_lock); 1266 /* Don't do a WCC update if these attributes are already stale */ 1267 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1268 !nfs_inode_attrs_need_update(inode, fattr)) { 1269 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1270 | NFS_ATTR_FATTR_PRESIZE 1271 | NFS_ATTR_FATTR_PREMTIME 1272 | NFS_ATTR_FATTR_PRECTIME); 1273 goto out_noforce; 1274 } 1275 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1276 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1277 fattr->pre_change_attr = inode->i_version; 1278 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1279 } 1280 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1281 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1282 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1283 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1284 } 1285 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1286 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1287 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1288 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1289 } 1290 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1291 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1292 fattr->pre_size = i_size_read(inode); 1293 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1294 } 1295 out_noforce: 1296 status = nfs_post_op_update_inode_locked(inode, fattr); 1297 spin_unlock(&inode->i_lock); 1298 return status; 1299 } 1300 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1301 1302 /* 1303 * Many nfs protocol calls return the new file attributes after 1304 * an operation. Here we update the inode to reflect the state 1305 * of the server's inode. 1306 * 1307 * This is a bit tricky because we have to make sure all dirty pages 1308 * have been sent off to the server before calling invalidate_inode_pages. 1309 * To make sure no other process adds more write requests while we try 1310 * our best to flush them, we make them sleep during the attribute refresh. 1311 * 1312 * A very similar scenario holds for the dir cache. 1313 */ 1314 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1315 { 1316 struct nfs_server *server; 1317 struct nfs_inode *nfsi = NFS_I(inode); 1318 loff_t cur_isize, new_isize; 1319 unsigned long invalid = 0; 1320 unsigned long now = jiffies; 1321 unsigned long save_cache_validity; 1322 1323 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n", 1324 __func__, inode->i_sb->s_id, inode->i_ino, 1325 nfs_display_fhandle_hash(NFS_FH(inode)), 1326 atomic_read(&inode->i_count), fattr->valid); 1327 1328 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) { 1329 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1330 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1331 NFS_SERVER(inode)->nfs_client->cl_hostname, 1332 inode->i_sb->s_id, (long long)nfsi->fileid, 1333 (long long)fattr->fileid); 1334 goto out_err; 1335 } 1336 1337 /* 1338 * Make sure the inode's type hasn't changed. 1339 */ 1340 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1341 /* 1342 * Big trouble! The inode has become a different object. 1343 */ 1344 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n", 1345 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1346 goto out_err; 1347 } 1348 1349 server = NFS_SERVER(inode); 1350 /* Update the fsid? */ 1351 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1352 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1353 !IS_AUTOMOUNT(inode)) 1354 server->fsid = fattr->fsid; 1355 1356 /* 1357 * Update the read time so we don't revalidate too often. 1358 */ 1359 nfsi->read_cache_jiffies = fattr->time_start; 1360 1361 save_cache_validity = nfsi->cache_validity; 1362 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1363 | NFS_INO_INVALID_ATIME 1364 | NFS_INO_REVAL_FORCED 1365 | NFS_INO_REVAL_PAGECACHE); 1366 1367 /* Do atomic weak cache consistency updates */ 1368 invalid |= nfs_wcc_update_inode(inode, fattr); 1369 1370 /* More cache consistency checks */ 1371 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1372 if (inode->i_version != fattr->change_attr) { 1373 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1374 inode->i_sb->s_id, inode->i_ino); 1375 invalid |= NFS_INO_INVALID_ATTR 1376 | NFS_INO_INVALID_DATA 1377 | NFS_INO_INVALID_ACCESS 1378 | NFS_INO_INVALID_ACL 1379 | NFS_INO_REVAL_PAGECACHE; 1380 if (S_ISDIR(inode->i_mode)) 1381 nfs_force_lookup_revalidate(inode); 1382 inode->i_version = fattr->change_attr; 1383 } 1384 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1385 invalid |= save_cache_validity; 1386 1387 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1388 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1389 } else if (server->caps & NFS_CAP_MTIME) 1390 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1391 | NFS_INO_REVAL_FORCED); 1392 1393 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1394 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1395 } else if (server->caps & NFS_CAP_CTIME) 1396 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1397 | NFS_INO_REVAL_FORCED); 1398 1399 /* Check if our cached file size is stale */ 1400 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1401 new_isize = nfs_size_to_loff_t(fattr->size); 1402 cur_isize = i_size_read(inode); 1403 if (new_isize != cur_isize) { 1404 /* Do we perhaps have any outstanding writes, or has 1405 * the file grown beyond our last write? */ 1406 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) || 1407 new_isize > cur_isize) { 1408 i_size_write(inode, new_isize); 1409 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1410 } 1411 dprintk("NFS: isize change on server for file %s/%ld " 1412 "(%Ld to %Ld)\n", 1413 inode->i_sb->s_id, 1414 inode->i_ino, 1415 (long long)cur_isize, 1416 (long long)new_isize); 1417 } 1418 } else 1419 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1420 | NFS_INO_REVAL_PAGECACHE 1421 | NFS_INO_REVAL_FORCED); 1422 1423 1424 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1425 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1426 else if (server->caps & NFS_CAP_ATIME) 1427 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME 1428 | NFS_INO_REVAL_FORCED); 1429 1430 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1431 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1432 umode_t newmode = inode->i_mode & S_IFMT; 1433 newmode |= fattr->mode & S_IALLUGO; 1434 inode->i_mode = newmode; 1435 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1436 } 1437 } else if (server->caps & NFS_CAP_MODE) 1438 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1439 | NFS_INO_INVALID_ACCESS 1440 | NFS_INO_INVALID_ACL 1441 | NFS_INO_REVAL_FORCED); 1442 1443 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1444 if (!uid_eq(inode->i_uid, fattr->uid)) { 1445 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1446 inode->i_uid = fattr->uid; 1447 } 1448 } else if (server->caps & NFS_CAP_OWNER) 1449 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1450 | NFS_INO_INVALID_ACCESS 1451 | NFS_INO_INVALID_ACL 1452 | NFS_INO_REVAL_FORCED); 1453 1454 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1455 if (!gid_eq(inode->i_gid, fattr->gid)) { 1456 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1457 inode->i_gid = fattr->gid; 1458 } 1459 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1460 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1461 | NFS_INO_INVALID_ACCESS 1462 | NFS_INO_INVALID_ACL 1463 | NFS_INO_REVAL_FORCED); 1464 1465 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1466 if (inode->i_nlink != fattr->nlink) { 1467 invalid |= NFS_INO_INVALID_ATTR; 1468 if (S_ISDIR(inode->i_mode)) 1469 invalid |= NFS_INO_INVALID_DATA; 1470 set_nlink(inode, fattr->nlink); 1471 } 1472 } else if (server->caps & NFS_CAP_NLINK) 1473 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1474 | NFS_INO_REVAL_FORCED); 1475 1476 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1477 /* 1478 * report the blocks in 512byte units 1479 */ 1480 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1481 } 1482 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1483 inode->i_blocks = fattr->du.nfs2.blocks; 1484 1485 /* Update attrtimeo value if we're out of the unstable period */ 1486 if (invalid & NFS_INO_INVALID_ATTR) { 1487 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1488 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1489 nfsi->attrtimeo_timestamp = now; 1490 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1491 } else { 1492 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1493 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1494 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1495 nfsi->attrtimeo_timestamp = now; 1496 } 1497 } 1498 invalid &= ~NFS_INO_INVALID_ATTR; 1499 /* Don't invalidate the data if we were to blame */ 1500 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1501 || S_ISLNK(inode->i_mode))) 1502 invalid &= ~NFS_INO_INVALID_DATA; 1503 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1504 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1505 nfsi->cache_validity |= invalid; 1506 1507 if (invalid & NFS_INO_INVALID_DATA) 1508 nfs_fscache_invalidate(inode); 1509 1510 return 0; 1511 out_err: 1512 /* 1513 * No need to worry about unhashing the dentry, as the 1514 * lookup validation will know that the inode is bad. 1515 * (But we fall through to invalidate the caches.) 1516 */ 1517 nfs_invalidate_inode(inode); 1518 return -ESTALE; 1519 } 1520 1521 struct inode *nfs_alloc_inode(struct super_block *sb) 1522 { 1523 struct nfs_inode *nfsi; 1524 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1525 if (!nfsi) 1526 return NULL; 1527 nfsi->flags = 0UL; 1528 nfsi->cache_validity = 0UL; 1529 #ifdef CONFIG_NFS_V3_ACL 1530 nfsi->acl_access = ERR_PTR(-EAGAIN); 1531 nfsi->acl_default = ERR_PTR(-EAGAIN); 1532 #endif 1533 #if IS_ENABLED(CONFIG_NFS_V4) 1534 nfsi->nfs4_acl = NULL; 1535 #endif /* CONFIG_NFS_V4 */ 1536 return &nfsi->vfs_inode; 1537 } 1538 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1539 1540 static void nfs_i_callback(struct rcu_head *head) 1541 { 1542 struct inode *inode = container_of(head, struct inode, i_rcu); 1543 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1544 } 1545 1546 void nfs_destroy_inode(struct inode *inode) 1547 { 1548 call_rcu(&inode->i_rcu, nfs_i_callback); 1549 } 1550 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1551 1552 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1553 { 1554 #if IS_ENABLED(CONFIG_NFS_V4) 1555 INIT_LIST_HEAD(&nfsi->open_states); 1556 nfsi->delegation = NULL; 1557 nfsi->delegation_state = 0; 1558 init_rwsem(&nfsi->rwsem); 1559 nfsi->layout = NULL; 1560 #endif 1561 } 1562 1563 static void init_once(void *foo) 1564 { 1565 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1566 1567 inode_init_once(&nfsi->vfs_inode); 1568 INIT_LIST_HEAD(&nfsi->open_files); 1569 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1570 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1571 INIT_LIST_HEAD(&nfsi->commit_info.list); 1572 nfsi->npages = 0; 1573 nfsi->commit_info.ncommit = 0; 1574 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1575 atomic_set(&nfsi->silly_count, 1); 1576 INIT_HLIST_HEAD(&nfsi->silly_list); 1577 init_waitqueue_head(&nfsi->waitqueue); 1578 nfs4_init_once(nfsi); 1579 } 1580 1581 static int __init nfs_init_inodecache(void) 1582 { 1583 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1584 sizeof(struct nfs_inode), 1585 0, (SLAB_RECLAIM_ACCOUNT| 1586 SLAB_MEM_SPREAD), 1587 init_once); 1588 if (nfs_inode_cachep == NULL) 1589 return -ENOMEM; 1590 1591 return 0; 1592 } 1593 1594 static void nfs_destroy_inodecache(void) 1595 { 1596 /* 1597 * Make sure all delayed rcu free inodes are flushed before we 1598 * destroy cache. 1599 */ 1600 rcu_barrier(); 1601 kmem_cache_destroy(nfs_inode_cachep); 1602 } 1603 1604 struct workqueue_struct *nfsiod_workqueue; 1605 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1606 1607 /* 1608 * start up the nfsiod workqueue 1609 */ 1610 static int nfsiod_start(void) 1611 { 1612 struct workqueue_struct *wq; 1613 dprintk("RPC: creating workqueue nfsiod\n"); 1614 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1615 if (wq == NULL) 1616 return -ENOMEM; 1617 nfsiod_workqueue = wq; 1618 return 0; 1619 } 1620 1621 /* 1622 * Destroy the nfsiod workqueue 1623 */ 1624 static void nfsiod_stop(void) 1625 { 1626 struct workqueue_struct *wq; 1627 1628 wq = nfsiod_workqueue; 1629 if (wq == NULL) 1630 return; 1631 nfsiod_workqueue = NULL; 1632 destroy_workqueue(wq); 1633 } 1634 1635 int nfs_net_id; 1636 EXPORT_SYMBOL_GPL(nfs_net_id); 1637 1638 static int nfs_net_init(struct net *net) 1639 { 1640 nfs_clients_init(net); 1641 return nfs_dns_resolver_cache_init(net); 1642 } 1643 1644 static void nfs_net_exit(struct net *net) 1645 { 1646 nfs_dns_resolver_cache_destroy(net); 1647 nfs_cleanup_cb_ident_idr(net); 1648 } 1649 1650 static struct pernet_operations nfs_net_ops = { 1651 .init = nfs_net_init, 1652 .exit = nfs_net_exit, 1653 .id = &nfs_net_id, 1654 .size = sizeof(struct nfs_net), 1655 }; 1656 1657 /* 1658 * Initialize NFS 1659 */ 1660 static int __init init_nfs_fs(void) 1661 { 1662 int err; 1663 1664 err = nfs_dns_resolver_init(); 1665 if (err < 0) 1666 goto out10;; 1667 1668 err = register_pernet_subsys(&nfs_net_ops); 1669 if (err < 0) 1670 goto out9; 1671 1672 err = nfs_fscache_register(); 1673 if (err < 0) 1674 goto out8; 1675 1676 err = nfsiod_start(); 1677 if (err) 1678 goto out7; 1679 1680 err = nfs_fs_proc_init(); 1681 if (err) 1682 goto out6; 1683 1684 err = nfs_init_nfspagecache(); 1685 if (err) 1686 goto out5; 1687 1688 err = nfs_init_inodecache(); 1689 if (err) 1690 goto out4; 1691 1692 err = nfs_init_readpagecache(); 1693 if (err) 1694 goto out3; 1695 1696 err = nfs_init_writepagecache(); 1697 if (err) 1698 goto out2; 1699 1700 err = nfs_init_directcache(); 1701 if (err) 1702 goto out1; 1703 1704 #ifdef CONFIG_PROC_FS 1705 rpc_proc_register(&init_net, &nfs_rpcstat); 1706 #endif 1707 if ((err = register_nfs_fs()) != 0) 1708 goto out0; 1709 1710 return 0; 1711 out0: 1712 #ifdef CONFIG_PROC_FS 1713 rpc_proc_unregister(&init_net, "nfs"); 1714 #endif 1715 nfs_destroy_directcache(); 1716 out1: 1717 nfs_destroy_writepagecache(); 1718 out2: 1719 nfs_destroy_readpagecache(); 1720 out3: 1721 nfs_destroy_inodecache(); 1722 out4: 1723 nfs_destroy_nfspagecache(); 1724 out5: 1725 nfs_fs_proc_exit(); 1726 out6: 1727 nfsiod_stop(); 1728 out7: 1729 nfs_fscache_unregister(); 1730 out8: 1731 unregister_pernet_subsys(&nfs_net_ops); 1732 out9: 1733 nfs_dns_resolver_destroy(); 1734 out10: 1735 return err; 1736 } 1737 1738 static void __exit exit_nfs_fs(void) 1739 { 1740 nfs_destroy_directcache(); 1741 nfs_destroy_writepagecache(); 1742 nfs_destroy_readpagecache(); 1743 nfs_destroy_inodecache(); 1744 nfs_destroy_nfspagecache(); 1745 nfs_fscache_unregister(); 1746 unregister_pernet_subsys(&nfs_net_ops); 1747 nfs_dns_resolver_destroy(); 1748 #ifdef CONFIG_PROC_FS 1749 rpc_proc_unregister(&init_net, "nfs"); 1750 #endif 1751 unregister_nfs_fs(); 1752 nfs_fs_proc_exit(); 1753 nfsiod_stop(); 1754 } 1755 1756 /* Not quite true; I just maintain it */ 1757 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1758 MODULE_LICENSE("GPL"); 1759 module_param(enable_ino64, bool, 0644); 1760 1761 module_init(init_nfs_fs) 1762 module_exit(exit_nfs_fs) 1763