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