1 /* 2 * linux/fs/nfs/inode.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs inode and superblock handling functions 7 * 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/sched.h> 19 #include <linux/time.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/string.h> 23 #include <linux/stat.h> 24 #include <linux/errno.h> 25 #include <linux/unistd.h> 26 #include <linux/sunrpc/clnt.h> 27 #include <linux/sunrpc/stats.h> 28 #include <linux/sunrpc/metrics.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/slab.h> 39 #include <linux/compat.h> 40 #include <linux/freezer.h> 41 42 #include <asm/uaccess.h> 43 44 #include "nfs4_fs.h" 45 #include "callback.h" 46 #include "delegation.h" 47 #include "iostat.h" 48 #include "internal.h" 49 #include "fscache.h" 50 #include "pnfs.h" 51 #include "nfs.h" 52 #include "netns.h" 53 54 #include "nfstrace.h" 55 56 #define NFSDBG_FACILITY NFSDBG_VFS 57 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 59 60 /* Default is to see 64-bit inode numbers */ 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_unsafe(); 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 nfs_fscache_invalidate(inode); 166 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 167 | NFS_INO_INVALID_LABEL 168 | NFS_INO_INVALID_DATA 169 | NFS_INO_INVALID_ACCESS 170 | NFS_INO_INVALID_ACL 171 | NFS_INO_REVAL_PAGECACHE; 172 } else 173 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 174 | NFS_INO_INVALID_LABEL 175 | NFS_INO_INVALID_ACCESS 176 | NFS_INO_INVALID_ACL 177 | NFS_INO_REVAL_PAGECACHE; 178 } 179 180 void nfs_zap_caches(struct inode *inode) 181 { 182 spin_lock(&inode->i_lock); 183 nfs_zap_caches_locked(inode); 184 spin_unlock(&inode->i_lock); 185 } 186 187 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 188 { 189 if (mapping->nrpages != 0) { 190 spin_lock(&inode->i_lock); 191 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 192 nfs_fscache_invalidate(inode); 193 spin_unlock(&inode->i_lock); 194 } 195 } 196 197 void nfs_zap_acl_cache(struct inode *inode) 198 { 199 void (*clear_acl_cache)(struct inode *); 200 201 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 202 if (clear_acl_cache != NULL) 203 clear_acl_cache(inode); 204 spin_lock(&inode->i_lock); 205 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 206 spin_unlock(&inode->i_lock); 207 } 208 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); 209 210 void nfs_invalidate_atime(struct inode *inode) 211 { 212 spin_lock(&inode->i_lock); 213 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; 214 spin_unlock(&inode->i_lock); 215 } 216 EXPORT_SYMBOL_GPL(nfs_invalidate_atime); 217 218 /* 219 * Invalidate, but do not unhash, the inode. 220 * NB: must be called with inode->i_lock held! 221 */ 222 static void nfs_invalidate_inode(struct inode *inode) 223 { 224 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 225 nfs_zap_caches_locked(inode); 226 } 227 228 struct nfs_find_desc { 229 struct nfs_fh *fh; 230 struct nfs_fattr *fattr; 231 }; 232 233 /* 234 * In NFSv3 we can have 64bit inode numbers. In order to support 235 * this, and re-exported directories (also seen in NFSv2) 236 * we are forced to allow 2 different inodes to have the same 237 * i_ino. 238 */ 239 static int 240 nfs_find_actor(struct inode *inode, void *opaque) 241 { 242 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 243 struct nfs_fh *fh = desc->fh; 244 struct nfs_fattr *fattr = desc->fattr; 245 246 if (NFS_FILEID(inode) != fattr->fileid) 247 return 0; 248 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode)) 249 return 0; 250 if (nfs_compare_fh(NFS_FH(inode), fh)) 251 return 0; 252 if (is_bad_inode(inode) || NFS_STALE(inode)) 253 return 0; 254 return 1; 255 } 256 257 static int 258 nfs_init_locked(struct inode *inode, void *opaque) 259 { 260 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 261 struct nfs_fattr *fattr = desc->fattr; 262 263 set_nfs_fileid(inode, fattr->fileid); 264 nfs_copy_fh(NFS_FH(inode), desc->fh); 265 return 0; 266 } 267 268 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 269 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 270 struct nfs4_label *label) 271 { 272 int error; 273 274 if (label == NULL) 275 return; 276 277 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL) == 0) 278 return; 279 280 if (NFS_SERVER(inode)->nfs_client->cl_minorversion < 2) 281 return; 282 283 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { 284 error = security_inode_notifysecctx(inode, label->label, 285 label->len); 286 if (error) 287 printk(KERN_ERR "%s() %s %d " 288 "security_inode_notifysecctx() %d\n", 289 __func__, 290 (char *)label->label, 291 label->len, error); 292 } 293 } 294 295 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) 296 { 297 struct nfs4_label *label = NULL; 298 int minor_version = server->nfs_client->cl_minorversion; 299 300 if (minor_version < 2) 301 return label; 302 303 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 304 return label; 305 306 label = kzalloc(sizeof(struct nfs4_label), flags); 307 if (label == NULL) 308 return ERR_PTR(-ENOMEM); 309 310 label->label = kzalloc(NFS4_MAXLABELLEN, flags); 311 if (label->label == NULL) { 312 kfree(label); 313 return ERR_PTR(-ENOMEM); 314 } 315 label->len = NFS4_MAXLABELLEN; 316 317 return label; 318 } 319 EXPORT_SYMBOL_GPL(nfs4_label_alloc); 320 #else 321 void inline nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, 322 struct nfs4_label *label) 323 { 324 } 325 #endif 326 EXPORT_SYMBOL_GPL(nfs_setsecurity); 327 328 /* 329 * This is our front-end to iget that looks up inodes by file handle 330 * instead of inode number. 331 */ 332 struct inode * 333 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label) 334 { 335 struct nfs_find_desc desc = { 336 .fh = fh, 337 .fattr = fattr 338 }; 339 struct inode *inode = ERR_PTR(-ENOENT); 340 unsigned long hash; 341 342 nfs_attr_check_mountpoint(sb, fattr); 343 344 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) && 345 !nfs_attr_use_mounted_on_fileid(fattr)) 346 goto out_no_inode; 347 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 348 goto out_no_inode; 349 350 hash = nfs_fattr_to_ino_t(fattr); 351 352 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 353 if (inode == NULL) { 354 inode = ERR_PTR(-ENOMEM); 355 goto out_no_inode; 356 } 357 358 if (inode->i_state & I_NEW) { 359 struct nfs_inode *nfsi = NFS_I(inode); 360 unsigned long now = jiffies; 361 362 /* We set i_ino for the few things that still rely on it, 363 * such as stat(2) */ 364 inode->i_ino = hash; 365 366 /* We can't support update_atime(), since the server will reset it */ 367 inode->i_flags |= S_NOATIME|S_NOCMTIME; 368 inode->i_mode = fattr->mode; 369 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 370 && nfs_server_capable(inode, NFS_CAP_MODE)) 371 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 372 /* Why so? Because we want revalidate for devices/FIFOs, and 373 * that's precisely what we have in nfs_file_inode_operations. 374 */ 375 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 376 if (S_ISREG(inode->i_mode)) { 377 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 378 inode->i_data.a_ops = &nfs_file_aops; 379 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 380 } else if (S_ISDIR(inode->i_mode)) { 381 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 382 inode->i_fop = &nfs_dir_operations; 383 inode->i_data.a_ops = &nfs_dir_aops; 384 /* Deal with crossing mountpoints */ 385 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 386 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 387 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 388 inode->i_op = &nfs_referral_inode_operations; 389 else 390 inode->i_op = &nfs_mountpoint_inode_operations; 391 inode->i_fop = NULL; 392 inode->i_flags |= S_AUTOMOUNT; 393 } 394 } else if (S_ISLNK(inode->i_mode)) 395 inode->i_op = &nfs_symlink_inode_operations; 396 else 397 init_special_inode(inode, inode->i_mode, fattr->rdev); 398 399 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 400 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 401 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 402 inode->i_version = 0; 403 inode->i_size = 0; 404 clear_nlink(inode); 405 inode->i_uid = make_kuid(&init_user_ns, -2); 406 inode->i_gid = make_kgid(&init_user_ns, -2); 407 inode->i_blocks = 0; 408 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 409 nfsi->write_io = 0; 410 nfsi->read_io = 0; 411 412 nfsi->read_cache_jiffies = fattr->time_start; 413 nfsi->attr_gencount = fattr->gencount; 414 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 415 inode->i_atime = fattr->atime; 416 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 417 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 418 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 419 inode->i_mtime = fattr->mtime; 420 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 421 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 422 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 423 inode->i_ctime = fattr->ctime; 424 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 425 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 426 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 427 inode->i_version = fattr->change_attr; 428 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) 429 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 430 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 431 inode->i_size = nfs_size_to_loff_t(fattr->size); 432 else 433 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 434 | NFS_INO_REVAL_PAGECACHE; 435 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 436 set_nlink(inode, fattr->nlink); 437 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 438 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 439 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 440 inode->i_uid = fattr->uid; 441 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 442 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 443 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 444 inode->i_gid = fattr->gid; 445 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 446 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 447 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 448 inode->i_blocks = fattr->du.nfs2.blocks; 449 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 450 /* 451 * report the blocks in 512byte units 452 */ 453 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 454 } 455 456 nfs_setsecurity(inode, fattr, label); 457 458 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 459 nfsi->attrtimeo_timestamp = now; 460 nfsi->access_cache = RB_ROOT; 461 462 nfs_fscache_init_inode_cookie(inode); 463 464 unlock_new_inode(inode); 465 } else 466 nfs_refresh_inode(inode, fattr); 467 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n", 468 inode->i_sb->s_id, 469 (long long)NFS_FILEID(inode), 470 nfs_display_fhandle_hash(fh), 471 atomic_read(&inode->i_count)); 472 473 out: 474 return inode; 475 476 out_no_inode: 477 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 478 goto out; 479 } 480 EXPORT_SYMBOL_GPL(nfs_fhget); 481 482 #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) 483 484 int 485 nfs_setattr(struct dentry *dentry, struct iattr *attr) 486 { 487 struct inode *inode = dentry->d_inode; 488 struct nfs_fattr *fattr; 489 int error = -ENOMEM; 490 491 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 492 493 /* skip mode change if it's just for clearing setuid/setgid */ 494 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 495 attr->ia_valid &= ~ATTR_MODE; 496 497 if (attr->ia_valid & ATTR_SIZE) { 498 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 499 attr->ia_valid &= ~ATTR_SIZE; 500 } 501 502 /* Optimization: if the end result is no change, don't RPC */ 503 attr->ia_valid &= NFS_VALID_ATTRS; 504 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 505 return 0; 506 507 trace_nfs_setattr_enter(inode); 508 509 /* Write all dirty data */ 510 if (S_ISREG(inode->i_mode)) { 511 nfs_inode_dio_wait(inode); 512 nfs_wb_all(inode); 513 } 514 515 fattr = nfs_alloc_fattr(); 516 if (fattr == NULL) 517 goto out; 518 /* 519 * Return any delegations if we're going to change ACLs 520 */ 521 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 522 NFS_PROTO(inode)->return_delegation(inode); 523 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 524 if (error == 0) 525 error = nfs_refresh_inode(inode, fattr); 526 nfs_free_fattr(fattr); 527 out: 528 trace_nfs_setattr_exit(inode, error); 529 return error; 530 } 531 EXPORT_SYMBOL_GPL(nfs_setattr); 532 533 /** 534 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 535 * @inode: inode of the file used 536 * @offset: file offset to start truncating 537 * 538 * This is a copy of the common vmtruncate, but with the locking 539 * corrected to take into account the fact that NFS requires 540 * inode->i_size to be updated under the inode->i_lock. 541 */ 542 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 543 { 544 int err; 545 546 err = inode_newsize_ok(inode, offset); 547 if (err) 548 goto out; 549 550 spin_lock(&inode->i_lock); 551 i_size_write(inode, offset); 552 spin_unlock(&inode->i_lock); 553 554 truncate_pagecache(inode, offset); 555 out: 556 return err; 557 } 558 559 /** 560 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 561 * @inode: pointer to struct inode 562 * @attr: pointer to struct iattr 563 * 564 * Note: we do this in the *proc.c in order to ensure that 565 * it works for things like exclusive creates too. 566 */ 567 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 568 { 569 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 570 spin_lock(&inode->i_lock); 571 if ((attr->ia_valid & ATTR_MODE) != 0) { 572 int mode = attr->ia_mode & S_IALLUGO; 573 mode |= inode->i_mode & ~S_IALLUGO; 574 inode->i_mode = mode; 575 } 576 if ((attr->ia_valid & ATTR_UID) != 0) 577 inode->i_uid = attr->ia_uid; 578 if ((attr->ia_valid & ATTR_GID) != 0) 579 inode->i_gid = attr->ia_gid; 580 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 581 spin_unlock(&inode->i_lock); 582 } 583 if ((attr->ia_valid & ATTR_SIZE) != 0) { 584 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 585 nfs_vmtruncate(inode, attr->ia_size); 586 } 587 } 588 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 589 590 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 591 { 592 struct inode *inode = dentry->d_inode; 593 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 594 int err; 595 596 trace_nfs_getattr_enter(inode); 597 /* Flush out writes to the server in order to update c/mtime. */ 598 if (S_ISREG(inode->i_mode)) { 599 nfs_inode_dio_wait(inode); 600 err = filemap_write_and_wait(inode->i_mapping); 601 if (err) 602 goto out; 603 } 604 605 /* 606 * We may force a getattr if the user cares about atime. 607 * 608 * Note that we only have to check the vfsmount flags here: 609 * - NFS always sets S_NOATIME by so checking it would give a 610 * bogus result 611 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 612 * no point in checking those. 613 */ 614 if ((mnt->mnt_flags & MNT_NOATIME) || 615 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 616 need_atime = 0; 617 618 if (need_atime) 619 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 620 else 621 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 622 if (!err) { 623 generic_fillattr(inode, stat); 624 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 625 } 626 out: 627 trace_nfs_getattr_exit(inode, err); 628 return err; 629 } 630 EXPORT_SYMBOL_GPL(nfs_getattr); 631 632 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 633 { 634 atomic_set(&l_ctx->count, 1); 635 l_ctx->lockowner.l_owner = current->files; 636 l_ctx->lockowner.l_pid = current->tgid; 637 INIT_LIST_HEAD(&l_ctx->list); 638 nfs_iocounter_init(&l_ctx->io_count); 639 } 640 641 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 642 { 643 struct nfs_lock_context *head = &ctx->lock_context; 644 struct nfs_lock_context *pos = head; 645 646 do { 647 if (pos->lockowner.l_owner != current->files) 648 continue; 649 if (pos->lockowner.l_pid != current->tgid) 650 continue; 651 atomic_inc(&pos->count); 652 return pos; 653 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 654 return NULL; 655 } 656 657 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 658 { 659 struct nfs_lock_context *res, *new = NULL; 660 struct inode *inode = ctx->dentry->d_inode; 661 662 spin_lock(&inode->i_lock); 663 res = __nfs_find_lock_context(ctx); 664 if (res == NULL) { 665 spin_unlock(&inode->i_lock); 666 new = kmalloc(sizeof(*new), GFP_KERNEL); 667 if (new == NULL) 668 return ERR_PTR(-ENOMEM); 669 nfs_init_lock_context(new); 670 spin_lock(&inode->i_lock); 671 res = __nfs_find_lock_context(ctx); 672 if (res == NULL) { 673 list_add_tail(&new->list, &ctx->lock_context.list); 674 new->open_context = ctx; 675 res = new; 676 new = NULL; 677 } 678 } 679 spin_unlock(&inode->i_lock); 680 kfree(new); 681 return res; 682 } 683 684 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 685 { 686 struct nfs_open_context *ctx = l_ctx->open_context; 687 struct inode *inode = ctx->dentry->d_inode; 688 689 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 690 return; 691 list_del(&l_ctx->list); 692 spin_unlock(&inode->i_lock); 693 kfree(l_ctx); 694 } 695 696 /** 697 * nfs_close_context - Common close_context() routine NFSv2/v3 698 * @ctx: pointer to context 699 * @is_sync: is this a synchronous close 700 * 701 * always ensure that the attributes are up to date if we're mounted 702 * with close-to-open semantics 703 */ 704 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 705 { 706 struct inode *inode; 707 struct nfs_server *server; 708 709 if (!(ctx->mode & FMODE_WRITE)) 710 return; 711 if (!is_sync) 712 return; 713 inode = ctx->dentry->d_inode; 714 if (!list_empty(&NFS_I(inode)->open_files)) 715 return; 716 server = NFS_SERVER(inode); 717 if (server->flags & NFS_MOUNT_NOCTO) 718 return; 719 nfs_revalidate_inode(server, inode); 720 } 721 EXPORT_SYMBOL_GPL(nfs_close_context); 722 723 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 724 { 725 struct nfs_open_context *ctx; 726 struct rpc_cred *cred = rpc_lookup_cred(); 727 if (IS_ERR(cred)) 728 return ERR_CAST(cred); 729 730 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 731 if (!ctx) { 732 put_rpccred(cred); 733 return ERR_PTR(-ENOMEM); 734 } 735 nfs_sb_active(dentry->d_sb); 736 ctx->dentry = dget(dentry); 737 ctx->cred = cred; 738 ctx->state = NULL; 739 ctx->mode = f_mode; 740 ctx->flags = 0; 741 ctx->error = 0; 742 nfs_init_lock_context(&ctx->lock_context); 743 ctx->lock_context.open_context = ctx; 744 INIT_LIST_HEAD(&ctx->list); 745 ctx->mdsthreshold = NULL; 746 return ctx; 747 } 748 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 749 750 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 751 { 752 if (ctx != NULL) 753 atomic_inc(&ctx->lock_context.count); 754 return ctx; 755 } 756 EXPORT_SYMBOL_GPL(get_nfs_open_context); 757 758 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 759 { 760 struct inode *inode = ctx->dentry->d_inode; 761 struct super_block *sb = ctx->dentry->d_sb; 762 763 if (!list_empty(&ctx->list)) { 764 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 765 return; 766 list_del(&ctx->list); 767 spin_unlock(&inode->i_lock); 768 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 769 return; 770 if (inode != NULL) 771 NFS_PROTO(inode)->close_context(ctx, is_sync); 772 if (ctx->cred != NULL) 773 put_rpccred(ctx->cred); 774 dput(ctx->dentry); 775 nfs_sb_deactive(sb); 776 kfree(ctx->mdsthreshold); 777 kfree(ctx); 778 } 779 780 void put_nfs_open_context(struct nfs_open_context *ctx) 781 { 782 __put_nfs_open_context(ctx, 0); 783 } 784 EXPORT_SYMBOL_GPL(put_nfs_open_context); 785 786 /* 787 * Ensure that mmap has a recent RPC credential for use when writing out 788 * shared pages 789 */ 790 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 791 { 792 struct inode *inode = ctx->dentry->d_inode; 793 struct nfs_inode *nfsi = NFS_I(inode); 794 795 spin_lock(&inode->i_lock); 796 list_add(&ctx->list, &nfsi->open_files); 797 spin_unlock(&inode->i_lock); 798 } 799 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 800 801 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 802 { 803 filp->private_data = get_nfs_open_context(ctx); 804 if (list_empty(&ctx->list)) 805 nfs_inode_attach_open_context(ctx); 806 } 807 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 808 809 /* 810 * Given an inode, search for an open context with the desired characteristics 811 */ 812 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 813 { 814 struct nfs_inode *nfsi = NFS_I(inode); 815 struct nfs_open_context *pos, *ctx = NULL; 816 817 spin_lock(&inode->i_lock); 818 list_for_each_entry(pos, &nfsi->open_files, list) { 819 if (cred != NULL && pos->cred != cred) 820 continue; 821 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 822 continue; 823 ctx = get_nfs_open_context(pos); 824 break; 825 } 826 spin_unlock(&inode->i_lock); 827 return ctx; 828 } 829 830 static void nfs_file_clear_open_context(struct file *filp) 831 { 832 struct nfs_open_context *ctx = nfs_file_open_context(filp); 833 834 if (ctx) { 835 struct inode *inode = ctx->dentry->d_inode; 836 837 filp->private_data = NULL; 838 spin_lock(&inode->i_lock); 839 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 840 spin_unlock(&inode->i_lock); 841 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 842 } 843 } 844 845 /* 846 * These allocate and release file read/write context information. 847 */ 848 int nfs_open(struct inode *inode, struct file *filp) 849 { 850 struct nfs_open_context *ctx; 851 852 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 853 if (IS_ERR(ctx)) 854 return PTR_ERR(ctx); 855 nfs_file_set_open_context(filp, ctx); 856 put_nfs_open_context(ctx); 857 nfs_fscache_set_inode_cookie(inode, filp); 858 return 0; 859 } 860 861 int nfs_release(struct inode *inode, struct file *filp) 862 { 863 nfs_file_clear_open_context(filp); 864 return 0; 865 } 866 867 /* 868 * This function is called whenever some part of NFS notices that 869 * the cached attributes have to be refreshed. 870 */ 871 int 872 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 873 { 874 int status = -ESTALE; 875 struct nfs4_label *label = NULL; 876 struct nfs_fattr *fattr = NULL; 877 struct nfs_inode *nfsi = NFS_I(inode); 878 879 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 880 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 881 882 trace_nfs_revalidate_inode_enter(inode); 883 884 if (is_bad_inode(inode)) 885 goto out; 886 if (NFS_STALE(inode)) 887 goto out; 888 889 status = -ENOMEM; 890 fattr = nfs_alloc_fattr(); 891 if (fattr == NULL) 892 goto out; 893 894 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 895 896 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 897 if (IS_ERR(label)) { 898 status = PTR_ERR(label); 899 goto out; 900 } 901 902 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 903 if (status != 0) { 904 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 905 inode->i_sb->s_id, 906 (long long)NFS_FILEID(inode), status); 907 if (status == -ESTALE) { 908 nfs_zap_caches(inode); 909 if (!S_ISDIR(inode->i_mode)) 910 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 911 } 912 goto err_out; 913 } 914 915 status = nfs_refresh_inode(inode, fattr); 916 if (status) { 917 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 918 inode->i_sb->s_id, 919 (long long)NFS_FILEID(inode), status); 920 goto err_out; 921 } 922 923 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 924 nfs_zap_acl_cache(inode); 925 926 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 927 inode->i_sb->s_id, 928 (long long)NFS_FILEID(inode)); 929 930 err_out: 931 nfs4_label_free(label); 932 out: 933 nfs_free_fattr(fattr); 934 trace_nfs_revalidate_inode_exit(inode, status); 935 return status; 936 } 937 938 int nfs_attribute_timeout(struct inode *inode) 939 { 940 struct nfs_inode *nfsi = NFS_I(inode); 941 942 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 943 } 944 945 int nfs_attribute_cache_expired(struct inode *inode) 946 { 947 if (nfs_have_delegated_attributes(inode)) 948 return 0; 949 return nfs_attribute_timeout(inode); 950 } 951 952 /** 953 * nfs_revalidate_inode - Revalidate the inode attributes 954 * @server - pointer to nfs_server struct 955 * @inode - pointer to inode struct 956 * 957 * Updates inode attribute information by retrieving the data from the server. 958 */ 959 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 960 { 961 if (!(NFS_I(inode)->cache_validity & 962 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 963 && !nfs_attribute_cache_expired(inode)) 964 return NFS_STALE(inode) ? -ESTALE : 0; 965 return __nfs_revalidate_inode(server, inode); 966 } 967 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 968 969 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 970 { 971 struct nfs_inode *nfsi = NFS_I(inode); 972 int ret; 973 974 if (mapping->nrpages != 0) { 975 if (S_ISREG(inode->i_mode)) { 976 ret = nfs_sync_mapping(mapping); 977 if (ret < 0) 978 return ret; 979 } 980 ret = invalidate_inode_pages2(mapping); 981 if (ret < 0) 982 return ret; 983 } 984 spin_lock(&inode->i_lock); 985 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 986 if (S_ISDIR(inode->i_mode)) 987 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 988 spin_unlock(&inode->i_lock); 989 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 990 nfs_fscache_wait_on_invalidate(inode); 991 992 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 993 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 994 return 0; 995 } 996 997 static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 998 { 999 if (nfs_have_delegated_attributes(inode)) 1000 return false; 1001 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 1002 || nfs_attribute_timeout(inode) 1003 || NFS_STALE(inode); 1004 } 1005 1006 /** 1007 * nfs_revalidate_mapping - Revalidate the pagecache 1008 * @inode - pointer to host inode 1009 * @mapping - pointer to mapping 1010 */ 1011 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1012 { 1013 struct nfs_inode *nfsi = NFS_I(inode); 1014 int ret = 0; 1015 1016 /* swapfiles are not supposed to be shared. */ 1017 if (IS_SWAPFILE(inode)) 1018 goto out; 1019 1020 if (nfs_mapping_need_revalidate_inode(inode)) { 1021 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1022 if (ret < 0) 1023 goto out; 1024 } 1025 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { 1026 trace_nfs_invalidate_mapping_enter(inode); 1027 ret = nfs_invalidate_mapping(inode, mapping); 1028 trace_nfs_invalidate_mapping_exit(inode, ret); 1029 } 1030 1031 out: 1032 return ret; 1033 } 1034 1035 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1036 { 1037 struct nfs_inode *nfsi = NFS_I(inode); 1038 unsigned long ret = 0; 1039 1040 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1041 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1042 && inode->i_version == fattr->pre_change_attr) { 1043 inode->i_version = fattr->change_attr; 1044 if (S_ISDIR(inode->i_mode)) 1045 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1046 ret |= NFS_INO_INVALID_ATTR; 1047 } 1048 /* If we have atomic WCC data, we may update some attributes */ 1049 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1050 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1051 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1052 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1053 ret |= NFS_INO_INVALID_ATTR; 1054 } 1055 1056 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1057 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1058 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1059 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1060 if (S_ISDIR(inode->i_mode)) 1061 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1062 ret |= NFS_INO_INVALID_ATTR; 1063 } 1064 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1065 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1066 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1067 && nfsi->npages == 0) { 1068 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1069 ret |= NFS_INO_INVALID_ATTR; 1070 } 1071 1072 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1073 nfs_fscache_invalidate(inode); 1074 1075 return ret; 1076 } 1077 1078 /** 1079 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1080 * @inode - pointer to inode 1081 * @fattr - updated attributes 1082 * 1083 * Verifies the attribute cache. If we have just changed the attributes, 1084 * so that fattr carries weak cache consistency data, then it may 1085 * also update the ctime/mtime/change_attribute. 1086 */ 1087 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1088 { 1089 struct nfs_inode *nfsi = NFS_I(inode); 1090 loff_t cur_size, new_isize; 1091 unsigned long invalid = 0; 1092 1093 1094 if (nfs_have_delegated_attributes(inode)) 1095 return 0; 1096 /* Has the inode gone and changed behind our back? */ 1097 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1098 return -EIO; 1099 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1100 return -EIO; 1101 1102 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1103 inode->i_version != fattr->change_attr) 1104 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1105 1106 /* Verify a few of the more important attributes */ 1107 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1108 invalid |= NFS_INO_INVALID_ATTR; 1109 1110 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1111 cur_size = i_size_read(inode); 1112 new_isize = nfs_size_to_loff_t(fattr->size); 1113 if (cur_size != new_isize && nfsi->npages == 0) 1114 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1115 } 1116 1117 /* Have any file permissions changed? */ 1118 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1119 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1120 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1121 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1122 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1123 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1124 1125 /* Has the link count changed? */ 1126 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1127 invalid |= NFS_INO_INVALID_ATTR; 1128 1129 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1130 invalid |= NFS_INO_INVALID_ATIME; 1131 1132 if (invalid != 0) 1133 nfsi->cache_validity |= invalid; 1134 1135 nfsi->read_cache_jiffies = fattr->time_start; 1136 return 0; 1137 } 1138 1139 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1140 { 1141 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 1142 return 0; 1143 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 1144 } 1145 1146 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1147 { 1148 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 1149 return 0; 1150 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 1151 } 1152 1153 static atomic_long_t nfs_attr_generation_counter; 1154 1155 static unsigned long nfs_read_attr_generation_counter(void) 1156 { 1157 return atomic_long_read(&nfs_attr_generation_counter); 1158 } 1159 1160 unsigned long nfs_inc_attr_generation_counter(void) 1161 { 1162 return atomic_long_inc_return(&nfs_attr_generation_counter); 1163 } 1164 1165 void nfs_fattr_init(struct nfs_fattr *fattr) 1166 { 1167 fattr->valid = 0; 1168 fattr->time_start = jiffies; 1169 fattr->gencount = nfs_inc_attr_generation_counter(); 1170 fattr->owner_name = NULL; 1171 fattr->group_name = NULL; 1172 } 1173 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1174 1175 struct nfs_fattr *nfs_alloc_fattr(void) 1176 { 1177 struct nfs_fattr *fattr; 1178 1179 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1180 if (fattr != NULL) 1181 nfs_fattr_init(fattr); 1182 return fattr; 1183 } 1184 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1185 1186 struct nfs_fh *nfs_alloc_fhandle(void) 1187 { 1188 struct nfs_fh *fh; 1189 1190 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1191 if (fh != NULL) 1192 fh->size = 0; 1193 return fh; 1194 } 1195 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1196 1197 #ifdef NFS_DEBUG 1198 /* 1199 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1200 * in the same way that wireshark does 1201 * 1202 * @fh: file handle 1203 * 1204 * For debugging only. 1205 */ 1206 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1207 { 1208 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1209 * not on the result */ 1210 return nfs_fhandle_hash(fh); 1211 } 1212 1213 /* 1214 * _nfs_display_fhandle - display an NFS file handle on the console 1215 * 1216 * @fh: file handle to display 1217 * @caption: display caption 1218 * 1219 * For debugging only. 1220 */ 1221 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1222 { 1223 unsigned short i; 1224 1225 if (fh == NULL || fh->size == 0) { 1226 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1227 return; 1228 } 1229 1230 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1231 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1232 for (i = 0; i < fh->size; i += 16) { 1233 __be32 *pos = (__be32 *)&fh->data[i]; 1234 1235 switch ((fh->size - i - 1) >> 2) { 1236 case 0: 1237 printk(KERN_DEFAULT " %08x\n", 1238 be32_to_cpup(pos)); 1239 break; 1240 case 1: 1241 printk(KERN_DEFAULT " %08x %08x\n", 1242 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1243 break; 1244 case 2: 1245 printk(KERN_DEFAULT " %08x %08x %08x\n", 1246 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1247 be32_to_cpup(pos + 2)); 1248 break; 1249 default: 1250 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1251 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1252 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1253 } 1254 } 1255 } 1256 #endif 1257 1258 /** 1259 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1260 * @inode - pointer to inode 1261 * @fattr - attributes 1262 * 1263 * Attempt to divine whether or not an RPC call reply carrying stale 1264 * attributes got scheduled after another call carrying updated ones. 1265 * 1266 * To do so, the function first assumes that a more recent ctime means 1267 * that the attributes in fattr are newer, however it also attempt to 1268 * catch the case where ctime either didn't change, or went backwards 1269 * (if someone reset the clock on the server) by looking at whether 1270 * or not this RPC call was started after the inode was last updated. 1271 * Note also the check for wraparound of 'attr_gencount' 1272 * 1273 * The function returns 'true' if it thinks the attributes in 'fattr' are 1274 * more recent than the ones cached in the inode. 1275 * 1276 */ 1277 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1278 { 1279 const struct nfs_inode *nfsi = NFS_I(inode); 1280 1281 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1282 nfs_ctime_need_update(inode, fattr) || 1283 nfs_size_need_update(inode, fattr) || 1284 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1285 } 1286 1287 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1288 { 1289 int ret; 1290 1291 trace_nfs_refresh_inode_enter(inode); 1292 1293 if (nfs_inode_attrs_need_update(inode, fattr)) 1294 ret = nfs_update_inode(inode, fattr); 1295 else 1296 ret = nfs_check_inode_attributes(inode, fattr); 1297 1298 trace_nfs_refresh_inode_exit(inode, ret); 1299 return ret; 1300 } 1301 1302 /** 1303 * nfs_refresh_inode - try to update the inode attribute cache 1304 * @inode - pointer to inode 1305 * @fattr - updated attributes 1306 * 1307 * Check that an RPC call that returned attributes has not overlapped with 1308 * other recent updates of the inode metadata, then decide whether it is 1309 * safe to do a full update of the inode attributes, or whether just to 1310 * call nfs_check_inode_attributes. 1311 */ 1312 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1313 { 1314 int status; 1315 1316 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1317 return 0; 1318 spin_lock(&inode->i_lock); 1319 status = nfs_refresh_inode_locked(inode, fattr); 1320 spin_unlock(&inode->i_lock); 1321 1322 return status; 1323 } 1324 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1325 1326 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1327 { 1328 struct nfs_inode *nfsi = NFS_I(inode); 1329 1330 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1331 if (S_ISDIR(inode->i_mode)) { 1332 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1333 nfs_fscache_invalidate(inode); 1334 } 1335 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1336 return 0; 1337 return nfs_refresh_inode_locked(inode, fattr); 1338 } 1339 1340 /** 1341 * nfs_post_op_update_inode - try to update the inode attribute cache 1342 * @inode - pointer to inode 1343 * @fattr - updated attributes 1344 * 1345 * After an operation that has changed the inode metadata, mark the 1346 * attribute cache as being invalid, then try to update it. 1347 * 1348 * NB: if the server didn't return any post op attributes, this 1349 * function will force the retrieval of attributes before the next 1350 * NFS request. Thus it should be used only for operations that 1351 * are expected to change one or more attributes, to avoid 1352 * unnecessary NFS requests and trips through nfs_update_inode(). 1353 */ 1354 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1355 { 1356 int status; 1357 1358 spin_lock(&inode->i_lock); 1359 status = nfs_post_op_update_inode_locked(inode, fattr); 1360 spin_unlock(&inode->i_lock); 1361 1362 return status; 1363 } 1364 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1365 1366 /** 1367 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1368 * @inode - pointer to inode 1369 * @fattr - updated attributes 1370 * 1371 * After an operation that has changed the inode metadata, mark the 1372 * attribute cache as being invalid, then try to update it. Fake up 1373 * weak cache consistency data, if none exist. 1374 * 1375 * This function is mainly designed to be used by the ->write_done() functions. 1376 */ 1377 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1378 { 1379 int status; 1380 1381 spin_lock(&inode->i_lock); 1382 /* Don't do a WCC update if these attributes are already stale */ 1383 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1384 !nfs_inode_attrs_need_update(inode, fattr)) { 1385 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1386 | NFS_ATTR_FATTR_PRESIZE 1387 | NFS_ATTR_FATTR_PREMTIME 1388 | NFS_ATTR_FATTR_PRECTIME); 1389 goto out_noforce; 1390 } 1391 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1392 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1393 fattr->pre_change_attr = inode->i_version; 1394 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1395 } 1396 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1397 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1398 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1399 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1400 } 1401 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1402 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1403 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1404 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1405 } 1406 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1407 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1408 fattr->pre_size = i_size_read(inode); 1409 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1410 } 1411 out_noforce: 1412 status = nfs_post_op_update_inode_locked(inode, fattr); 1413 spin_unlock(&inode->i_lock); 1414 return status; 1415 } 1416 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1417 1418 /* 1419 * Many nfs protocol calls return the new file attributes after 1420 * an operation. Here we update the inode to reflect the state 1421 * of the server's inode. 1422 * 1423 * This is a bit tricky because we have to make sure all dirty pages 1424 * have been sent off to the server before calling invalidate_inode_pages. 1425 * To make sure no other process adds more write requests while we try 1426 * our best to flush them, we make them sleep during the attribute refresh. 1427 * 1428 * A very similar scenario holds for the dir cache. 1429 */ 1430 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1431 { 1432 struct nfs_server *server; 1433 struct nfs_inode *nfsi = NFS_I(inode); 1434 loff_t cur_isize, new_isize; 1435 unsigned long invalid = 0; 1436 unsigned long now = jiffies; 1437 unsigned long save_cache_validity; 1438 1439 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n", 1440 __func__, inode->i_sb->s_id, inode->i_ino, 1441 nfs_display_fhandle_hash(NFS_FH(inode)), 1442 atomic_read(&inode->i_count), fattr->valid); 1443 1444 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) { 1445 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1446 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1447 NFS_SERVER(inode)->nfs_client->cl_hostname, 1448 inode->i_sb->s_id, (long long)nfsi->fileid, 1449 (long long)fattr->fileid); 1450 goto out_err; 1451 } 1452 1453 /* 1454 * Make sure the inode's type hasn't changed. 1455 */ 1456 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1457 /* 1458 * Big trouble! The inode has become a different object. 1459 */ 1460 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n", 1461 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1462 goto out_err; 1463 } 1464 1465 server = NFS_SERVER(inode); 1466 /* Update the fsid? */ 1467 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1468 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1469 !IS_AUTOMOUNT(inode)) 1470 server->fsid = fattr->fsid; 1471 1472 /* 1473 * Update the read time so we don't revalidate too often. 1474 */ 1475 nfsi->read_cache_jiffies = fattr->time_start; 1476 1477 save_cache_validity = nfsi->cache_validity; 1478 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1479 | NFS_INO_INVALID_ATIME 1480 | NFS_INO_REVAL_FORCED 1481 | NFS_INO_REVAL_PAGECACHE); 1482 1483 /* Do atomic weak cache consistency updates */ 1484 invalid |= nfs_wcc_update_inode(inode, fattr); 1485 1486 /* More cache consistency checks */ 1487 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1488 if (inode->i_version != fattr->change_attr) { 1489 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1490 inode->i_sb->s_id, inode->i_ino); 1491 invalid |= NFS_INO_INVALID_ATTR 1492 | NFS_INO_INVALID_DATA 1493 | NFS_INO_INVALID_ACCESS 1494 | NFS_INO_INVALID_ACL 1495 | NFS_INO_REVAL_PAGECACHE; 1496 if (S_ISDIR(inode->i_mode)) 1497 nfs_force_lookup_revalidate(inode); 1498 inode->i_version = fattr->change_attr; 1499 } 1500 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1501 invalid |= save_cache_validity; 1502 1503 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1504 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1505 } else if (server->caps & NFS_CAP_MTIME) 1506 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1507 | NFS_INO_REVAL_FORCED); 1508 1509 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1510 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1511 } else if (server->caps & NFS_CAP_CTIME) 1512 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1513 | NFS_INO_REVAL_FORCED); 1514 1515 /* Check if our cached file size is stale */ 1516 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1517 new_isize = nfs_size_to_loff_t(fattr->size); 1518 cur_isize = i_size_read(inode); 1519 if (new_isize != cur_isize) { 1520 /* Do we perhaps have any outstanding writes, or has 1521 * the file grown beyond our last write? */ 1522 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) || 1523 new_isize > cur_isize) { 1524 i_size_write(inode, new_isize); 1525 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1526 } 1527 dprintk("NFS: isize change on server for file %s/%ld " 1528 "(%Ld to %Ld)\n", 1529 inode->i_sb->s_id, 1530 inode->i_ino, 1531 (long long)cur_isize, 1532 (long long)new_isize); 1533 } 1534 } else 1535 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1536 | NFS_INO_REVAL_PAGECACHE 1537 | NFS_INO_REVAL_FORCED); 1538 1539 1540 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1541 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1542 else if (server->caps & NFS_CAP_ATIME) 1543 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME 1544 | NFS_INO_REVAL_FORCED); 1545 1546 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1547 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1548 umode_t newmode = inode->i_mode & S_IFMT; 1549 newmode |= fattr->mode & S_IALLUGO; 1550 inode->i_mode = newmode; 1551 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1552 } 1553 } else if (server->caps & NFS_CAP_MODE) 1554 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1555 | NFS_INO_INVALID_ACCESS 1556 | NFS_INO_INVALID_ACL 1557 | NFS_INO_REVAL_FORCED); 1558 1559 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1560 if (!uid_eq(inode->i_uid, fattr->uid)) { 1561 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1562 inode->i_uid = fattr->uid; 1563 } 1564 } else if (server->caps & NFS_CAP_OWNER) 1565 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1566 | NFS_INO_INVALID_ACCESS 1567 | NFS_INO_INVALID_ACL 1568 | NFS_INO_REVAL_FORCED); 1569 1570 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1571 if (!gid_eq(inode->i_gid, fattr->gid)) { 1572 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1573 inode->i_gid = fattr->gid; 1574 } 1575 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1576 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1577 | NFS_INO_INVALID_ACCESS 1578 | NFS_INO_INVALID_ACL 1579 | NFS_INO_REVAL_FORCED); 1580 1581 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1582 if (inode->i_nlink != fattr->nlink) { 1583 invalid |= NFS_INO_INVALID_ATTR; 1584 if (S_ISDIR(inode->i_mode)) 1585 invalid |= NFS_INO_INVALID_DATA; 1586 set_nlink(inode, fattr->nlink); 1587 } 1588 } else if (server->caps & NFS_CAP_NLINK) 1589 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1590 | NFS_INO_REVAL_FORCED); 1591 1592 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1593 /* 1594 * report the blocks in 512byte units 1595 */ 1596 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1597 } 1598 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1599 inode->i_blocks = fattr->du.nfs2.blocks; 1600 1601 /* Update attrtimeo value if we're out of the unstable period */ 1602 if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) { 1603 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1604 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1605 nfsi->attrtimeo_timestamp = now; 1606 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1607 } else { 1608 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1609 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1610 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1611 nfsi->attrtimeo_timestamp = now; 1612 } 1613 } 1614 invalid &= ~NFS_INO_INVALID_ATTR; 1615 invalid &= ~NFS_INO_INVALID_LABEL; 1616 /* Don't invalidate the data if we were to blame */ 1617 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1618 || S_ISLNK(inode->i_mode))) 1619 invalid &= ~NFS_INO_INVALID_DATA; 1620 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1621 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1622 nfsi->cache_validity |= invalid; 1623 1624 if (invalid & NFS_INO_INVALID_DATA) 1625 nfs_fscache_invalidate(inode); 1626 1627 return 0; 1628 out_err: 1629 /* 1630 * No need to worry about unhashing the dentry, as the 1631 * lookup validation will know that the inode is bad. 1632 * (But we fall through to invalidate the caches.) 1633 */ 1634 nfs_invalidate_inode(inode); 1635 return -ESTALE; 1636 } 1637 1638 struct inode *nfs_alloc_inode(struct super_block *sb) 1639 { 1640 struct nfs_inode *nfsi; 1641 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1642 if (!nfsi) 1643 return NULL; 1644 nfsi->flags = 0UL; 1645 nfsi->cache_validity = 0UL; 1646 #ifdef CONFIG_NFS_V3_ACL 1647 nfsi->acl_access = ERR_PTR(-EAGAIN); 1648 nfsi->acl_default = ERR_PTR(-EAGAIN); 1649 #endif 1650 #if IS_ENABLED(CONFIG_NFS_V4) 1651 nfsi->nfs4_acl = NULL; 1652 #endif /* CONFIG_NFS_V4 */ 1653 return &nfsi->vfs_inode; 1654 } 1655 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1656 1657 static void nfs_i_callback(struct rcu_head *head) 1658 { 1659 struct inode *inode = container_of(head, struct inode, i_rcu); 1660 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1661 } 1662 1663 void nfs_destroy_inode(struct inode *inode) 1664 { 1665 call_rcu(&inode->i_rcu, nfs_i_callback); 1666 } 1667 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1668 1669 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1670 { 1671 #if IS_ENABLED(CONFIG_NFS_V4) 1672 INIT_LIST_HEAD(&nfsi->open_states); 1673 nfsi->delegation = NULL; 1674 nfsi->delegation_state = 0; 1675 init_rwsem(&nfsi->rwsem); 1676 nfsi->layout = NULL; 1677 #endif 1678 } 1679 1680 static void init_once(void *foo) 1681 { 1682 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1683 1684 inode_init_once(&nfsi->vfs_inode); 1685 INIT_LIST_HEAD(&nfsi->open_files); 1686 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1687 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1688 INIT_LIST_HEAD(&nfsi->commit_info.list); 1689 nfsi->npages = 0; 1690 nfsi->commit_info.ncommit = 0; 1691 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1692 atomic_set(&nfsi->silly_count, 1); 1693 INIT_HLIST_HEAD(&nfsi->silly_list); 1694 init_waitqueue_head(&nfsi->waitqueue); 1695 nfs4_init_once(nfsi); 1696 } 1697 1698 static int __init nfs_init_inodecache(void) 1699 { 1700 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1701 sizeof(struct nfs_inode), 1702 0, (SLAB_RECLAIM_ACCOUNT| 1703 SLAB_MEM_SPREAD), 1704 init_once); 1705 if (nfs_inode_cachep == NULL) 1706 return -ENOMEM; 1707 1708 return 0; 1709 } 1710 1711 static void nfs_destroy_inodecache(void) 1712 { 1713 /* 1714 * Make sure all delayed rcu free inodes are flushed before we 1715 * destroy cache. 1716 */ 1717 rcu_barrier(); 1718 kmem_cache_destroy(nfs_inode_cachep); 1719 } 1720 1721 struct workqueue_struct *nfsiod_workqueue; 1722 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1723 1724 /* 1725 * start up the nfsiod workqueue 1726 */ 1727 static int nfsiod_start(void) 1728 { 1729 struct workqueue_struct *wq; 1730 dprintk("RPC: creating workqueue nfsiod\n"); 1731 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1732 if (wq == NULL) 1733 return -ENOMEM; 1734 nfsiod_workqueue = wq; 1735 return 0; 1736 } 1737 1738 /* 1739 * Destroy the nfsiod workqueue 1740 */ 1741 static void nfsiod_stop(void) 1742 { 1743 struct workqueue_struct *wq; 1744 1745 wq = nfsiod_workqueue; 1746 if (wq == NULL) 1747 return; 1748 nfsiod_workqueue = NULL; 1749 destroy_workqueue(wq); 1750 } 1751 1752 int nfs_net_id; 1753 EXPORT_SYMBOL_GPL(nfs_net_id); 1754 1755 static int nfs_net_init(struct net *net) 1756 { 1757 nfs_clients_init(net); 1758 return 0; 1759 } 1760 1761 static void nfs_net_exit(struct net *net) 1762 { 1763 nfs_cleanup_cb_ident_idr(net); 1764 } 1765 1766 static struct pernet_operations nfs_net_ops = { 1767 .init = nfs_net_init, 1768 .exit = nfs_net_exit, 1769 .id = &nfs_net_id, 1770 .size = sizeof(struct nfs_net), 1771 }; 1772 1773 /* 1774 * Initialize NFS 1775 */ 1776 static int __init init_nfs_fs(void) 1777 { 1778 int err; 1779 1780 err = register_pernet_subsys(&nfs_net_ops); 1781 if (err < 0) 1782 goto out9; 1783 1784 err = nfs_fscache_register(); 1785 if (err < 0) 1786 goto out8; 1787 1788 err = nfsiod_start(); 1789 if (err) 1790 goto out7; 1791 1792 err = nfs_fs_proc_init(); 1793 if (err) 1794 goto out6; 1795 1796 err = nfs_init_nfspagecache(); 1797 if (err) 1798 goto out5; 1799 1800 err = nfs_init_inodecache(); 1801 if (err) 1802 goto out4; 1803 1804 err = nfs_init_readpagecache(); 1805 if (err) 1806 goto out3; 1807 1808 err = nfs_init_writepagecache(); 1809 if (err) 1810 goto out2; 1811 1812 err = nfs_init_directcache(); 1813 if (err) 1814 goto out1; 1815 1816 #ifdef CONFIG_PROC_FS 1817 rpc_proc_register(&init_net, &nfs_rpcstat); 1818 #endif 1819 if ((err = register_nfs_fs()) != 0) 1820 goto out0; 1821 1822 return 0; 1823 out0: 1824 #ifdef CONFIG_PROC_FS 1825 rpc_proc_unregister(&init_net, "nfs"); 1826 #endif 1827 nfs_destroy_directcache(); 1828 out1: 1829 nfs_destroy_writepagecache(); 1830 out2: 1831 nfs_destroy_readpagecache(); 1832 out3: 1833 nfs_destroy_inodecache(); 1834 out4: 1835 nfs_destroy_nfspagecache(); 1836 out5: 1837 nfs_fs_proc_exit(); 1838 out6: 1839 nfsiod_stop(); 1840 out7: 1841 nfs_fscache_unregister(); 1842 out8: 1843 unregister_pernet_subsys(&nfs_net_ops); 1844 out9: 1845 return err; 1846 } 1847 1848 static void __exit exit_nfs_fs(void) 1849 { 1850 nfs_destroy_directcache(); 1851 nfs_destroy_writepagecache(); 1852 nfs_destroy_readpagecache(); 1853 nfs_destroy_inodecache(); 1854 nfs_destroy_nfspagecache(); 1855 nfs_fscache_unregister(); 1856 unregister_pernet_subsys(&nfs_net_ops); 1857 #ifdef CONFIG_PROC_FS 1858 rpc_proc_unregister(&init_net, "nfs"); 1859 #endif 1860 unregister_nfs_fs(); 1861 nfs_fs_proc_exit(); 1862 nfsiod_stop(); 1863 } 1864 1865 /* Not quite true; I just maintain it */ 1866 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1867 MODULE_LICENSE("GPL"); 1868 module_param(enable_ino64, bool, 0644); 1869 1870 module_init(init_nfs_fs) 1871 module_exit(exit_nfs_fs) 1872