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 loff_t oldsize; 545 int err; 546 547 err = inode_newsize_ok(inode, offset); 548 if (err) 549 goto out; 550 551 spin_lock(&inode->i_lock); 552 oldsize = inode->i_size; 553 i_size_write(inode, offset); 554 spin_unlock(&inode->i_lock); 555 556 truncate_pagecache(inode, oldsize, offset); 557 out: 558 return err; 559 } 560 561 /** 562 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 563 * @inode: pointer to struct inode 564 * @attr: pointer to struct iattr 565 * 566 * Note: we do this in the *proc.c in order to ensure that 567 * it works for things like exclusive creates too. 568 */ 569 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 570 { 571 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 572 spin_lock(&inode->i_lock); 573 if ((attr->ia_valid & ATTR_MODE) != 0) { 574 int mode = attr->ia_mode & S_IALLUGO; 575 mode |= inode->i_mode & ~S_IALLUGO; 576 inode->i_mode = mode; 577 } 578 if ((attr->ia_valid & ATTR_UID) != 0) 579 inode->i_uid = attr->ia_uid; 580 if ((attr->ia_valid & ATTR_GID) != 0) 581 inode->i_gid = attr->ia_gid; 582 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 583 spin_unlock(&inode->i_lock); 584 } 585 if ((attr->ia_valid & ATTR_SIZE) != 0) { 586 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 587 nfs_vmtruncate(inode, attr->ia_size); 588 } 589 } 590 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); 591 592 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 593 { 594 struct inode *inode = dentry->d_inode; 595 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 596 int err; 597 598 trace_nfs_getattr_enter(inode); 599 /* Flush out writes to the server in order to update c/mtime. */ 600 if (S_ISREG(inode->i_mode)) { 601 nfs_inode_dio_wait(inode); 602 err = filemap_write_and_wait(inode->i_mapping); 603 if (err) 604 goto out; 605 } 606 607 /* 608 * We may force a getattr if the user cares about atime. 609 * 610 * Note that we only have to check the vfsmount flags here: 611 * - NFS always sets S_NOATIME by so checking it would give a 612 * bogus result 613 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 614 * no point in checking those. 615 */ 616 if ((mnt->mnt_flags & MNT_NOATIME) || 617 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 618 need_atime = 0; 619 620 if (need_atime) 621 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 622 else 623 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 624 if (!err) { 625 generic_fillattr(inode, stat); 626 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 627 } 628 out: 629 trace_nfs_getattr_exit(inode, err); 630 return err; 631 } 632 EXPORT_SYMBOL_GPL(nfs_getattr); 633 634 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 635 { 636 atomic_set(&l_ctx->count, 1); 637 l_ctx->lockowner.l_owner = current->files; 638 l_ctx->lockowner.l_pid = current->tgid; 639 INIT_LIST_HEAD(&l_ctx->list); 640 nfs_iocounter_init(&l_ctx->io_count); 641 } 642 643 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 644 { 645 struct nfs_lock_context *head = &ctx->lock_context; 646 struct nfs_lock_context *pos = head; 647 648 do { 649 if (pos->lockowner.l_owner != current->files) 650 continue; 651 if (pos->lockowner.l_pid != current->tgid) 652 continue; 653 atomic_inc(&pos->count); 654 return pos; 655 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); 656 return NULL; 657 } 658 659 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 660 { 661 struct nfs_lock_context *res, *new = NULL; 662 struct inode *inode = ctx->dentry->d_inode; 663 664 spin_lock(&inode->i_lock); 665 res = __nfs_find_lock_context(ctx); 666 if (res == NULL) { 667 spin_unlock(&inode->i_lock); 668 new = kmalloc(sizeof(*new), GFP_KERNEL); 669 if (new == NULL) 670 return ERR_PTR(-ENOMEM); 671 nfs_init_lock_context(new); 672 spin_lock(&inode->i_lock); 673 res = __nfs_find_lock_context(ctx); 674 if (res == NULL) { 675 list_add_tail(&new->list, &ctx->lock_context.list); 676 new->open_context = ctx; 677 res = new; 678 new = NULL; 679 } 680 } 681 spin_unlock(&inode->i_lock); 682 kfree(new); 683 return res; 684 } 685 686 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 687 { 688 struct nfs_open_context *ctx = l_ctx->open_context; 689 struct inode *inode = ctx->dentry->d_inode; 690 691 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 692 return; 693 list_del(&l_ctx->list); 694 spin_unlock(&inode->i_lock); 695 kfree(l_ctx); 696 } 697 698 /** 699 * nfs_close_context - Common close_context() routine NFSv2/v3 700 * @ctx: pointer to context 701 * @is_sync: is this a synchronous close 702 * 703 * always ensure that the attributes are up to date if we're mounted 704 * with close-to-open semantics 705 */ 706 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 707 { 708 struct inode *inode; 709 struct nfs_server *server; 710 711 if (!(ctx->mode & FMODE_WRITE)) 712 return; 713 if (!is_sync) 714 return; 715 inode = ctx->dentry->d_inode; 716 if (!list_empty(&NFS_I(inode)->open_files)) 717 return; 718 server = NFS_SERVER(inode); 719 if (server->flags & NFS_MOUNT_NOCTO) 720 return; 721 nfs_revalidate_inode(server, inode); 722 } 723 EXPORT_SYMBOL_GPL(nfs_close_context); 724 725 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 726 { 727 struct nfs_open_context *ctx; 728 struct rpc_cred *cred = rpc_lookup_cred(); 729 if (IS_ERR(cred)) 730 return ERR_CAST(cred); 731 732 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 733 if (!ctx) { 734 put_rpccred(cred); 735 return ERR_PTR(-ENOMEM); 736 } 737 nfs_sb_active(dentry->d_sb); 738 ctx->dentry = dget(dentry); 739 ctx->cred = cred; 740 ctx->state = NULL; 741 ctx->mode = f_mode; 742 ctx->flags = 0; 743 ctx->error = 0; 744 nfs_init_lock_context(&ctx->lock_context); 745 ctx->lock_context.open_context = ctx; 746 INIT_LIST_HEAD(&ctx->list); 747 ctx->mdsthreshold = NULL; 748 return ctx; 749 } 750 EXPORT_SYMBOL_GPL(alloc_nfs_open_context); 751 752 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 753 { 754 if (ctx != NULL) 755 atomic_inc(&ctx->lock_context.count); 756 return ctx; 757 } 758 EXPORT_SYMBOL_GPL(get_nfs_open_context); 759 760 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 761 { 762 struct inode *inode = ctx->dentry->d_inode; 763 struct super_block *sb = ctx->dentry->d_sb; 764 765 if (!list_empty(&ctx->list)) { 766 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 767 return; 768 list_del(&ctx->list); 769 spin_unlock(&inode->i_lock); 770 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 771 return; 772 if (inode != NULL) 773 NFS_PROTO(inode)->close_context(ctx, is_sync); 774 if (ctx->cred != NULL) 775 put_rpccred(ctx->cred); 776 dput(ctx->dentry); 777 nfs_sb_deactive(sb); 778 kfree(ctx->mdsthreshold); 779 kfree(ctx); 780 } 781 782 void put_nfs_open_context(struct nfs_open_context *ctx) 783 { 784 __put_nfs_open_context(ctx, 0); 785 } 786 EXPORT_SYMBOL_GPL(put_nfs_open_context); 787 788 /* 789 * Ensure that mmap has a recent RPC credential for use when writing out 790 * shared pages 791 */ 792 void nfs_inode_attach_open_context(struct nfs_open_context *ctx) 793 { 794 struct inode *inode = ctx->dentry->d_inode; 795 struct nfs_inode *nfsi = NFS_I(inode); 796 797 spin_lock(&inode->i_lock); 798 list_add(&ctx->list, &nfsi->open_files); 799 spin_unlock(&inode->i_lock); 800 } 801 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); 802 803 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 804 { 805 filp->private_data = get_nfs_open_context(ctx); 806 if (list_empty(&ctx->list)) 807 nfs_inode_attach_open_context(ctx); 808 } 809 EXPORT_SYMBOL_GPL(nfs_file_set_open_context); 810 811 /* 812 * Given an inode, search for an open context with the desired characteristics 813 */ 814 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 815 { 816 struct nfs_inode *nfsi = NFS_I(inode); 817 struct nfs_open_context *pos, *ctx = NULL; 818 819 spin_lock(&inode->i_lock); 820 list_for_each_entry(pos, &nfsi->open_files, list) { 821 if (cred != NULL && pos->cred != cred) 822 continue; 823 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 824 continue; 825 ctx = get_nfs_open_context(pos); 826 break; 827 } 828 spin_unlock(&inode->i_lock); 829 return ctx; 830 } 831 832 static void nfs_file_clear_open_context(struct file *filp) 833 { 834 struct nfs_open_context *ctx = nfs_file_open_context(filp); 835 836 if (ctx) { 837 struct inode *inode = ctx->dentry->d_inode; 838 839 filp->private_data = NULL; 840 spin_lock(&inode->i_lock); 841 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 842 spin_unlock(&inode->i_lock); 843 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 844 } 845 } 846 847 /* 848 * These allocate and release file read/write context information. 849 */ 850 int nfs_open(struct inode *inode, struct file *filp) 851 { 852 struct nfs_open_context *ctx; 853 854 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 855 if (IS_ERR(ctx)) 856 return PTR_ERR(ctx); 857 nfs_file_set_open_context(filp, ctx); 858 put_nfs_open_context(ctx); 859 nfs_fscache_set_inode_cookie(inode, filp); 860 return 0; 861 } 862 863 int nfs_release(struct inode *inode, struct file *filp) 864 { 865 nfs_file_clear_open_context(filp); 866 return 0; 867 } 868 869 /* 870 * This function is called whenever some part of NFS notices that 871 * the cached attributes have to be refreshed. 872 */ 873 int 874 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 875 { 876 int status = -ESTALE; 877 struct nfs4_label *label = NULL; 878 struct nfs_fattr *fattr = NULL; 879 struct nfs_inode *nfsi = NFS_I(inode); 880 881 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 882 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 883 884 trace_nfs_revalidate_inode_enter(inode); 885 886 if (is_bad_inode(inode)) 887 goto out; 888 if (NFS_STALE(inode)) 889 goto out; 890 891 status = -ENOMEM; 892 fattr = nfs_alloc_fattr(); 893 if (fattr == NULL) 894 goto out; 895 896 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 897 898 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 899 if (IS_ERR(label)) { 900 status = PTR_ERR(label); 901 goto out; 902 } 903 904 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label); 905 if (status != 0) { 906 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 907 inode->i_sb->s_id, 908 (long long)NFS_FILEID(inode), status); 909 if (status == -ESTALE) { 910 nfs_zap_caches(inode); 911 if (!S_ISDIR(inode->i_mode)) 912 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 913 } 914 goto err_out; 915 } 916 917 status = nfs_refresh_inode(inode, fattr); 918 if (status) { 919 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 920 inode->i_sb->s_id, 921 (long long)NFS_FILEID(inode), status); 922 goto err_out; 923 } 924 925 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 926 nfs_zap_acl_cache(inode); 927 928 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 929 inode->i_sb->s_id, 930 (long long)NFS_FILEID(inode)); 931 932 err_out: 933 nfs4_label_free(label); 934 out: 935 nfs_free_fattr(fattr); 936 trace_nfs_revalidate_inode_exit(inode, status); 937 return status; 938 } 939 940 int nfs_attribute_timeout(struct inode *inode) 941 { 942 struct nfs_inode *nfsi = NFS_I(inode); 943 944 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 945 } 946 947 int nfs_attribute_cache_expired(struct inode *inode) 948 { 949 if (nfs_have_delegated_attributes(inode)) 950 return 0; 951 return nfs_attribute_timeout(inode); 952 } 953 954 /** 955 * nfs_revalidate_inode - Revalidate the inode attributes 956 * @server - pointer to nfs_server struct 957 * @inode - pointer to inode struct 958 * 959 * Updates inode attribute information by retrieving the data from the server. 960 */ 961 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 962 { 963 if (!(NFS_I(inode)->cache_validity & 964 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) 965 && !nfs_attribute_cache_expired(inode)) 966 return NFS_STALE(inode) ? -ESTALE : 0; 967 return __nfs_revalidate_inode(server, inode); 968 } 969 EXPORT_SYMBOL_GPL(nfs_revalidate_inode); 970 971 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 972 { 973 struct nfs_inode *nfsi = NFS_I(inode); 974 int ret; 975 976 if (mapping->nrpages != 0) { 977 if (S_ISREG(inode->i_mode)) { 978 ret = nfs_sync_mapping(mapping); 979 if (ret < 0) 980 return ret; 981 } 982 ret = invalidate_inode_pages2(mapping); 983 if (ret < 0) 984 return ret; 985 } 986 spin_lock(&inode->i_lock); 987 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 988 if (S_ISDIR(inode->i_mode)) 989 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 990 spin_unlock(&inode->i_lock); 991 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 992 nfs_fscache_wait_on_invalidate(inode); 993 994 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 995 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 996 return 0; 997 } 998 999 static bool nfs_mapping_need_revalidate_inode(struct inode *inode) 1000 { 1001 if (nfs_have_delegated_attributes(inode)) 1002 return false; 1003 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE) 1004 || nfs_attribute_timeout(inode) 1005 || NFS_STALE(inode); 1006 } 1007 1008 /** 1009 * nfs_revalidate_mapping - Revalidate the pagecache 1010 * @inode - pointer to host inode 1011 * @mapping - pointer to mapping 1012 */ 1013 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1014 { 1015 struct nfs_inode *nfsi = NFS_I(inode); 1016 int ret = 0; 1017 1018 /* swapfiles are not supposed to be shared. */ 1019 if (IS_SWAPFILE(inode)) 1020 goto out; 1021 1022 if (nfs_mapping_need_revalidate_inode(inode)) { 1023 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 1024 if (ret < 0) 1025 goto out; 1026 } 1027 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { 1028 trace_nfs_invalidate_mapping_enter(inode); 1029 ret = nfs_invalidate_mapping(inode, mapping); 1030 trace_nfs_invalidate_mapping_exit(inode, ret); 1031 } 1032 1033 out: 1034 return ret; 1035 } 1036 1037 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1038 { 1039 struct nfs_inode *nfsi = NFS_I(inode); 1040 unsigned long ret = 0; 1041 1042 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 1043 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 1044 && inode->i_version == fattr->pre_change_attr) { 1045 inode->i_version = fattr->change_attr; 1046 if (S_ISDIR(inode->i_mode)) 1047 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1048 ret |= NFS_INO_INVALID_ATTR; 1049 } 1050 /* If we have atomic WCC data, we may update some attributes */ 1051 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 1052 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 1053 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 1054 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1055 ret |= NFS_INO_INVALID_ATTR; 1056 } 1057 1058 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 1059 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 1060 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 1061 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1062 if (S_ISDIR(inode->i_mode)) 1063 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1064 ret |= NFS_INO_INVALID_ATTR; 1065 } 1066 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 1067 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 1068 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 1069 && nfsi->npages == 0) { 1070 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 1071 ret |= NFS_INO_INVALID_ATTR; 1072 } 1073 1074 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 1075 nfs_fscache_invalidate(inode); 1076 1077 return ret; 1078 } 1079 1080 /** 1081 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 1082 * @inode - pointer to inode 1083 * @fattr - updated attributes 1084 * 1085 * Verifies the attribute cache. If we have just changed the attributes, 1086 * so that fattr carries weak cache consistency data, then it may 1087 * also update the ctime/mtime/change_attribute. 1088 */ 1089 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 1090 { 1091 struct nfs_inode *nfsi = NFS_I(inode); 1092 loff_t cur_size, new_isize; 1093 unsigned long invalid = 0; 1094 1095 1096 if (nfs_have_delegated_attributes(inode)) 1097 return 0; 1098 /* Has the inode gone and changed behind our back? */ 1099 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1100 return -EIO; 1101 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1102 return -EIO; 1103 1104 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1105 inode->i_version != fattr->change_attr) 1106 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1107 1108 /* Verify a few of the more important attributes */ 1109 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 1110 invalid |= NFS_INO_INVALID_ATTR; 1111 1112 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1113 cur_size = i_size_read(inode); 1114 new_isize = nfs_size_to_loff_t(fattr->size); 1115 if (cur_size != new_isize && nfsi->npages == 0) 1116 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1117 } 1118 1119 /* Have any file permissions changed? */ 1120 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 1121 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1122 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) 1123 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1124 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) 1125 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1126 1127 /* Has the link count changed? */ 1128 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 1129 invalid |= NFS_INO_INVALID_ATTR; 1130 1131 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 1132 invalid |= NFS_INO_INVALID_ATIME; 1133 1134 if (invalid != 0) 1135 nfsi->cache_validity |= invalid; 1136 1137 nfsi->read_cache_jiffies = fattr->time_start; 1138 return 0; 1139 } 1140 1141 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1142 { 1143 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 1144 return 0; 1145 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 1146 } 1147 1148 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1149 { 1150 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 1151 return 0; 1152 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 1153 } 1154 1155 static atomic_long_t nfs_attr_generation_counter; 1156 1157 static unsigned long nfs_read_attr_generation_counter(void) 1158 { 1159 return atomic_long_read(&nfs_attr_generation_counter); 1160 } 1161 1162 unsigned long nfs_inc_attr_generation_counter(void) 1163 { 1164 return atomic_long_inc_return(&nfs_attr_generation_counter); 1165 } 1166 1167 void nfs_fattr_init(struct nfs_fattr *fattr) 1168 { 1169 fattr->valid = 0; 1170 fattr->time_start = jiffies; 1171 fattr->gencount = nfs_inc_attr_generation_counter(); 1172 fattr->owner_name = NULL; 1173 fattr->group_name = NULL; 1174 } 1175 EXPORT_SYMBOL_GPL(nfs_fattr_init); 1176 1177 struct nfs_fattr *nfs_alloc_fattr(void) 1178 { 1179 struct nfs_fattr *fattr; 1180 1181 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1182 if (fattr != NULL) 1183 nfs_fattr_init(fattr); 1184 return fattr; 1185 } 1186 EXPORT_SYMBOL_GPL(nfs_alloc_fattr); 1187 1188 struct nfs_fh *nfs_alloc_fhandle(void) 1189 { 1190 struct nfs_fh *fh; 1191 1192 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1193 if (fh != NULL) 1194 fh->size = 0; 1195 return fh; 1196 } 1197 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); 1198 1199 #ifdef NFS_DEBUG 1200 /* 1201 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle 1202 * in the same way that wireshark does 1203 * 1204 * @fh: file handle 1205 * 1206 * For debugging only. 1207 */ 1208 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) 1209 { 1210 /* wireshark uses 32-bit AUTODIN crc and does a bitwise 1211 * not on the result */ 1212 return nfs_fhandle_hash(fh); 1213 } 1214 1215 /* 1216 * _nfs_display_fhandle - display an NFS file handle on the console 1217 * 1218 * @fh: file handle to display 1219 * @caption: display caption 1220 * 1221 * For debugging only. 1222 */ 1223 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) 1224 { 1225 unsigned short i; 1226 1227 if (fh == NULL || fh->size == 0) { 1228 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); 1229 return; 1230 } 1231 1232 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", 1233 caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); 1234 for (i = 0; i < fh->size; i += 16) { 1235 __be32 *pos = (__be32 *)&fh->data[i]; 1236 1237 switch ((fh->size - i - 1) >> 2) { 1238 case 0: 1239 printk(KERN_DEFAULT " %08x\n", 1240 be32_to_cpup(pos)); 1241 break; 1242 case 1: 1243 printk(KERN_DEFAULT " %08x %08x\n", 1244 be32_to_cpup(pos), be32_to_cpup(pos + 1)); 1245 break; 1246 case 2: 1247 printk(KERN_DEFAULT " %08x %08x %08x\n", 1248 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1249 be32_to_cpup(pos + 2)); 1250 break; 1251 default: 1252 printk(KERN_DEFAULT " %08x %08x %08x %08x\n", 1253 be32_to_cpup(pos), be32_to_cpup(pos + 1), 1254 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); 1255 } 1256 } 1257 } 1258 #endif 1259 1260 /** 1261 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1262 * @inode - pointer to inode 1263 * @fattr - attributes 1264 * 1265 * Attempt to divine whether or not an RPC call reply carrying stale 1266 * attributes got scheduled after another call carrying updated ones. 1267 * 1268 * To do so, the function first assumes that a more recent ctime means 1269 * that the attributes in fattr are newer, however it also attempt to 1270 * catch the case where ctime either didn't change, or went backwards 1271 * (if someone reset the clock on the server) by looking at whether 1272 * or not this RPC call was started after the inode was last updated. 1273 * Note also the check for wraparound of 'attr_gencount' 1274 * 1275 * The function returns 'true' if it thinks the attributes in 'fattr' are 1276 * more recent than the ones cached in the inode. 1277 * 1278 */ 1279 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1280 { 1281 const struct nfs_inode *nfsi = NFS_I(inode); 1282 1283 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1284 nfs_ctime_need_update(inode, fattr) || 1285 nfs_size_need_update(inode, fattr) || 1286 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1287 } 1288 1289 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1290 { 1291 int ret; 1292 1293 trace_nfs_refresh_inode_enter(inode); 1294 1295 if (nfs_inode_attrs_need_update(inode, fattr)) 1296 ret = nfs_update_inode(inode, fattr); 1297 else 1298 ret = nfs_check_inode_attributes(inode, fattr); 1299 1300 trace_nfs_refresh_inode_exit(inode, ret); 1301 return ret; 1302 } 1303 1304 /** 1305 * nfs_refresh_inode - try to update the inode attribute cache 1306 * @inode - pointer to inode 1307 * @fattr - updated attributes 1308 * 1309 * Check that an RPC call that returned attributes has not overlapped with 1310 * other recent updates of the inode metadata, then decide whether it is 1311 * safe to do a full update of the inode attributes, or whether just to 1312 * call nfs_check_inode_attributes. 1313 */ 1314 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1315 { 1316 int status; 1317 1318 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1319 return 0; 1320 spin_lock(&inode->i_lock); 1321 status = nfs_refresh_inode_locked(inode, fattr); 1322 spin_unlock(&inode->i_lock); 1323 1324 return status; 1325 } 1326 EXPORT_SYMBOL_GPL(nfs_refresh_inode); 1327 1328 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1329 { 1330 struct nfs_inode *nfsi = NFS_I(inode); 1331 1332 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1333 if (S_ISDIR(inode->i_mode)) { 1334 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1335 nfs_fscache_invalidate(inode); 1336 } 1337 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1338 return 0; 1339 return nfs_refresh_inode_locked(inode, fattr); 1340 } 1341 1342 /** 1343 * nfs_post_op_update_inode - try to update the inode attribute cache 1344 * @inode - pointer to inode 1345 * @fattr - updated attributes 1346 * 1347 * After an operation that has changed the inode metadata, mark the 1348 * attribute cache as being invalid, then try to update it. 1349 * 1350 * NB: if the server didn't return any post op attributes, this 1351 * function will force the retrieval of attributes before the next 1352 * NFS request. Thus it should be used only for operations that 1353 * are expected to change one or more attributes, to avoid 1354 * unnecessary NFS requests and trips through nfs_update_inode(). 1355 */ 1356 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1357 { 1358 int status; 1359 1360 spin_lock(&inode->i_lock); 1361 status = nfs_post_op_update_inode_locked(inode, fattr); 1362 spin_unlock(&inode->i_lock); 1363 1364 return status; 1365 } 1366 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); 1367 1368 /** 1369 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1370 * @inode - pointer to inode 1371 * @fattr - updated attributes 1372 * 1373 * After an operation that has changed the inode metadata, mark the 1374 * attribute cache as being invalid, then try to update it. Fake up 1375 * weak cache consistency data, if none exist. 1376 * 1377 * This function is mainly designed to be used by the ->write_done() functions. 1378 */ 1379 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1380 { 1381 int status; 1382 1383 spin_lock(&inode->i_lock); 1384 /* Don't do a WCC update if these attributes are already stale */ 1385 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1386 !nfs_inode_attrs_need_update(inode, fattr)) { 1387 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1388 | NFS_ATTR_FATTR_PRESIZE 1389 | NFS_ATTR_FATTR_PREMTIME 1390 | NFS_ATTR_FATTR_PRECTIME); 1391 goto out_noforce; 1392 } 1393 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1394 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1395 fattr->pre_change_attr = inode->i_version; 1396 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1397 } 1398 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1399 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1400 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1401 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1402 } 1403 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1404 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1405 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1406 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1407 } 1408 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1409 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1410 fattr->pre_size = i_size_read(inode); 1411 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1412 } 1413 out_noforce: 1414 status = nfs_post_op_update_inode_locked(inode, fattr); 1415 spin_unlock(&inode->i_lock); 1416 return status; 1417 } 1418 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); 1419 1420 /* 1421 * Many nfs protocol calls return the new file attributes after 1422 * an operation. Here we update the inode to reflect the state 1423 * of the server's inode. 1424 * 1425 * This is a bit tricky because we have to make sure all dirty pages 1426 * have been sent off to the server before calling invalidate_inode_pages. 1427 * To make sure no other process adds more write requests while we try 1428 * our best to flush them, we make them sleep during the attribute refresh. 1429 * 1430 * A very similar scenario holds for the dir cache. 1431 */ 1432 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1433 { 1434 struct nfs_server *server; 1435 struct nfs_inode *nfsi = NFS_I(inode); 1436 loff_t cur_isize, new_isize; 1437 unsigned long invalid = 0; 1438 unsigned long now = jiffies; 1439 unsigned long save_cache_validity; 1440 1441 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n", 1442 __func__, inode->i_sb->s_id, inode->i_ino, 1443 nfs_display_fhandle_hash(NFS_FH(inode)), 1444 atomic_read(&inode->i_count), fattr->valid); 1445 1446 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) { 1447 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1448 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1449 NFS_SERVER(inode)->nfs_client->cl_hostname, 1450 inode->i_sb->s_id, (long long)nfsi->fileid, 1451 (long long)fattr->fileid); 1452 goto out_err; 1453 } 1454 1455 /* 1456 * Make sure the inode's type hasn't changed. 1457 */ 1458 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { 1459 /* 1460 * Big trouble! The inode has become a different object. 1461 */ 1462 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n", 1463 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1464 goto out_err; 1465 } 1466 1467 server = NFS_SERVER(inode); 1468 /* Update the fsid? */ 1469 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1470 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1471 !IS_AUTOMOUNT(inode)) 1472 server->fsid = fattr->fsid; 1473 1474 /* 1475 * Update the read time so we don't revalidate too often. 1476 */ 1477 nfsi->read_cache_jiffies = fattr->time_start; 1478 1479 save_cache_validity = nfsi->cache_validity; 1480 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1481 | NFS_INO_INVALID_ATIME 1482 | NFS_INO_REVAL_FORCED 1483 | NFS_INO_REVAL_PAGECACHE); 1484 1485 /* Do atomic weak cache consistency updates */ 1486 invalid |= nfs_wcc_update_inode(inode, fattr); 1487 1488 /* More cache consistency checks */ 1489 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1490 if (inode->i_version != fattr->change_attr) { 1491 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1492 inode->i_sb->s_id, inode->i_ino); 1493 invalid |= NFS_INO_INVALID_ATTR 1494 | NFS_INO_INVALID_DATA 1495 | NFS_INO_INVALID_ACCESS 1496 | NFS_INO_INVALID_ACL 1497 | NFS_INO_REVAL_PAGECACHE; 1498 if (S_ISDIR(inode->i_mode)) 1499 nfs_force_lookup_revalidate(inode); 1500 inode->i_version = fattr->change_attr; 1501 } 1502 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1503 invalid |= save_cache_validity; 1504 1505 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1506 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1507 } else if (server->caps & NFS_CAP_MTIME) 1508 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1509 | NFS_INO_REVAL_FORCED); 1510 1511 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1512 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1513 } else if (server->caps & NFS_CAP_CTIME) 1514 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1515 | NFS_INO_REVAL_FORCED); 1516 1517 /* Check if our cached file size is stale */ 1518 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1519 new_isize = nfs_size_to_loff_t(fattr->size); 1520 cur_isize = i_size_read(inode); 1521 if (new_isize != cur_isize) { 1522 /* Do we perhaps have any outstanding writes, or has 1523 * the file grown beyond our last write? */ 1524 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) || 1525 new_isize > cur_isize) { 1526 i_size_write(inode, new_isize); 1527 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1528 } 1529 dprintk("NFS: isize change on server for file %s/%ld " 1530 "(%Ld to %Ld)\n", 1531 inode->i_sb->s_id, 1532 inode->i_ino, 1533 (long long)cur_isize, 1534 (long long)new_isize); 1535 } 1536 } else 1537 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1538 | NFS_INO_REVAL_PAGECACHE 1539 | NFS_INO_REVAL_FORCED); 1540 1541 1542 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1543 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1544 else if (server->caps & NFS_CAP_ATIME) 1545 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME 1546 | NFS_INO_REVAL_FORCED); 1547 1548 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1549 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1550 umode_t newmode = inode->i_mode & S_IFMT; 1551 newmode |= fattr->mode & S_IALLUGO; 1552 inode->i_mode = newmode; 1553 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1554 } 1555 } else if (server->caps & NFS_CAP_MODE) 1556 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1557 | NFS_INO_INVALID_ACCESS 1558 | NFS_INO_INVALID_ACL 1559 | NFS_INO_REVAL_FORCED); 1560 1561 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1562 if (!uid_eq(inode->i_uid, fattr->uid)) { 1563 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1564 inode->i_uid = fattr->uid; 1565 } 1566 } else if (server->caps & NFS_CAP_OWNER) 1567 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1568 | NFS_INO_INVALID_ACCESS 1569 | NFS_INO_INVALID_ACL 1570 | NFS_INO_REVAL_FORCED); 1571 1572 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1573 if (!gid_eq(inode->i_gid, fattr->gid)) { 1574 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1575 inode->i_gid = fattr->gid; 1576 } 1577 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1578 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1579 | NFS_INO_INVALID_ACCESS 1580 | NFS_INO_INVALID_ACL 1581 | NFS_INO_REVAL_FORCED); 1582 1583 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1584 if (inode->i_nlink != fattr->nlink) { 1585 invalid |= NFS_INO_INVALID_ATTR; 1586 if (S_ISDIR(inode->i_mode)) 1587 invalid |= NFS_INO_INVALID_DATA; 1588 set_nlink(inode, fattr->nlink); 1589 } 1590 } else if (server->caps & NFS_CAP_NLINK) 1591 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1592 | NFS_INO_REVAL_FORCED); 1593 1594 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1595 /* 1596 * report the blocks in 512byte units 1597 */ 1598 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1599 } 1600 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1601 inode->i_blocks = fattr->du.nfs2.blocks; 1602 1603 /* Update attrtimeo value if we're out of the unstable period */ 1604 if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) { 1605 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1606 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1607 nfsi->attrtimeo_timestamp = now; 1608 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1609 } else { 1610 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1611 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1612 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1613 nfsi->attrtimeo_timestamp = now; 1614 } 1615 } 1616 invalid &= ~NFS_INO_INVALID_ATTR; 1617 invalid &= ~NFS_INO_INVALID_LABEL; 1618 /* Don't invalidate the data if we were to blame */ 1619 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1620 || S_ISLNK(inode->i_mode))) 1621 invalid &= ~NFS_INO_INVALID_DATA; 1622 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) || 1623 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1624 nfsi->cache_validity |= invalid; 1625 1626 if (invalid & NFS_INO_INVALID_DATA) 1627 nfs_fscache_invalidate(inode); 1628 1629 return 0; 1630 out_err: 1631 /* 1632 * No need to worry about unhashing the dentry, as the 1633 * lookup validation will know that the inode is bad. 1634 * (But we fall through to invalidate the caches.) 1635 */ 1636 nfs_invalidate_inode(inode); 1637 return -ESTALE; 1638 } 1639 1640 struct inode *nfs_alloc_inode(struct super_block *sb) 1641 { 1642 struct nfs_inode *nfsi; 1643 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1644 if (!nfsi) 1645 return NULL; 1646 nfsi->flags = 0UL; 1647 nfsi->cache_validity = 0UL; 1648 #ifdef CONFIG_NFS_V3_ACL 1649 nfsi->acl_access = ERR_PTR(-EAGAIN); 1650 nfsi->acl_default = ERR_PTR(-EAGAIN); 1651 #endif 1652 #if IS_ENABLED(CONFIG_NFS_V4) 1653 nfsi->nfs4_acl = NULL; 1654 #endif /* CONFIG_NFS_V4 */ 1655 return &nfsi->vfs_inode; 1656 } 1657 EXPORT_SYMBOL_GPL(nfs_alloc_inode); 1658 1659 static void nfs_i_callback(struct rcu_head *head) 1660 { 1661 struct inode *inode = container_of(head, struct inode, i_rcu); 1662 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1663 } 1664 1665 void nfs_destroy_inode(struct inode *inode) 1666 { 1667 call_rcu(&inode->i_rcu, nfs_i_callback); 1668 } 1669 EXPORT_SYMBOL_GPL(nfs_destroy_inode); 1670 1671 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1672 { 1673 #if IS_ENABLED(CONFIG_NFS_V4) 1674 INIT_LIST_HEAD(&nfsi->open_states); 1675 nfsi->delegation = NULL; 1676 nfsi->delegation_state = 0; 1677 init_rwsem(&nfsi->rwsem); 1678 nfsi->layout = NULL; 1679 #endif 1680 } 1681 1682 static void init_once(void *foo) 1683 { 1684 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1685 1686 inode_init_once(&nfsi->vfs_inode); 1687 INIT_LIST_HEAD(&nfsi->open_files); 1688 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1689 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1690 INIT_LIST_HEAD(&nfsi->commit_info.list); 1691 nfsi->npages = 0; 1692 nfsi->commit_info.ncommit = 0; 1693 atomic_set(&nfsi->commit_info.rpcs_out, 0); 1694 atomic_set(&nfsi->silly_count, 1); 1695 INIT_HLIST_HEAD(&nfsi->silly_list); 1696 init_waitqueue_head(&nfsi->waitqueue); 1697 nfs4_init_once(nfsi); 1698 } 1699 1700 static int __init nfs_init_inodecache(void) 1701 { 1702 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1703 sizeof(struct nfs_inode), 1704 0, (SLAB_RECLAIM_ACCOUNT| 1705 SLAB_MEM_SPREAD), 1706 init_once); 1707 if (nfs_inode_cachep == NULL) 1708 return -ENOMEM; 1709 1710 return 0; 1711 } 1712 1713 static void nfs_destroy_inodecache(void) 1714 { 1715 /* 1716 * Make sure all delayed rcu free inodes are flushed before we 1717 * destroy cache. 1718 */ 1719 rcu_barrier(); 1720 kmem_cache_destroy(nfs_inode_cachep); 1721 } 1722 1723 struct workqueue_struct *nfsiod_workqueue; 1724 EXPORT_SYMBOL_GPL(nfsiod_workqueue); 1725 1726 /* 1727 * start up the nfsiod workqueue 1728 */ 1729 static int nfsiod_start(void) 1730 { 1731 struct workqueue_struct *wq; 1732 dprintk("RPC: creating workqueue nfsiod\n"); 1733 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1734 if (wq == NULL) 1735 return -ENOMEM; 1736 nfsiod_workqueue = wq; 1737 return 0; 1738 } 1739 1740 /* 1741 * Destroy the nfsiod workqueue 1742 */ 1743 static void nfsiod_stop(void) 1744 { 1745 struct workqueue_struct *wq; 1746 1747 wq = nfsiod_workqueue; 1748 if (wq == NULL) 1749 return; 1750 nfsiod_workqueue = NULL; 1751 destroy_workqueue(wq); 1752 } 1753 1754 int nfs_net_id; 1755 EXPORT_SYMBOL_GPL(nfs_net_id); 1756 1757 static int nfs_net_init(struct net *net) 1758 { 1759 nfs_clients_init(net); 1760 return 0; 1761 } 1762 1763 static void nfs_net_exit(struct net *net) 1764 { 1765 nfs_cleanup_cb_ident_idr(net); 1766 } 1767 1768 static struct pernet_operations nfs_net_ops = { 1769 .init = nfs_net_init, 1770 .exit = nfs_net_exit, 1771 .id = &nfs_net_id, 1772 .size = sizeof(struct nfs_net), 1773 }; 1774 1775 /* 1776 * Initialize NFS 1777 */ 1778 static int __init init_nfs_fs(void) 1779 { 1780 int err; 1781 1782 err = register_pernet_subsys(&nfs_net_ops); 1783 if (err < 0) 1784 goto out9; 1785 1786 err = nfs_fscache_register(); 1787 if (err < 0) 1788 goto out8; 1789 1790 err = nfsiod_start(); 1791 if (err) 1792 goto out7; 1793 1794 err = nfs_fs_proc_init(); 1795 if (err) 1796 goto out6; 1797 1798 err = nfs_init_nfspagecache(); 1799 if (err) 1800 goto out5; 1801 1802 err = nfs_init_inodecache(); 1803 if (err) 1804 goto out4; 1805 1806 err = nfs_init_readpagecache(); 1807 if (err) 1808 goto out3; 1809 1810 err = nfs_init_writepagecache(); 1811 if (err) 1812 goto out2; 1813 1814 err = nfs_init_directcache(); 1815 if (err) 1816 goto out1; 1817 1818 #ifdef CONFIG_PROC_FS 1819 rpc_proc_register(&init_net, &nfs_rpcstat); 1820 #endif 1821 if ((err = register_nfs_fs()) != 0) 1822 goto out0; 1823 1824 return 0; 1825 out0: 1826 #ifdef CONFIG_PROC_FS 1827 rpc_proc_unregister(&init_net, "nfs"); 1828 #endif 1829 nfs_destroy_directcache(); 1830 out1: 1831 nfs_destroy_writepagecache(); 1832 out2: 1833 nfs_destroy_readpagecache(); 1834 out3: 1835 nfs_destroy_inodecache(); 1836 out4: 1837 nfs_destroy_nfspagecache(); 1838 out5: 1839 nfs_fs_proc_exit(); 1840 out6: 1841 nfsiod_stop(); 1842 out7: 1843 nfs_fscache_unregister(); 1844 out8: 1845 unregister_pernet_subsys(&nfs_net_ops); 1846 out9: 1847 return err; 1848 } 1849 1850 static void __exit exit_nfs_fs(void) 1851 { 1852 nfs_destroy_directcache(); 1853 nfs_destroy_writepagecache(); 1854 nfs_destroy_readpagecache(); 1855 nfs_destroy_inodecache(); 1856 nfs_destroy_nfspagecache(); 1857 nfs_fscache_unregister(); 1858 unregister_pernet_subsys(&nfs_net_ops); 1859 #ifdef CONFIG_PROC_FS 1860 rpc_proc_unregister(&init_net, "nfs"); 1861 #endif 1862 unregister_nfs_fs(); 1863 nfs_fs_proc_exit(); 1864 nfsiod_stop(); 1865 } 1866 1867 /* Not quite true; I just maintain it */ 1868 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1869 MODULE_LICENSE("GPL"); 1870 module_param(enable_ino64, bool, 0644); 1871 1872 module_init(init_nfs_fs) 1873 module_exit(exit_nfs_fs) 1874