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/nfs_idmap.h> 36 #include <linux/vfs.h> 37 #include <linux/inet.h> 38 #include <linux/nfs_xdr.h> 39 #include <linux/slab.h> 40 #include <linux/compat.h> 41 #include <linux/freezer.h> 42 43 #include <asm/system.h> 44 #include <asm/uaccess.h> 45 46 #include "nfs4_fs.h" 47 #include "callback.h" 48 #include "delegation.h" 49 #include "iostat.h" 50 #include "internal.h" 51 #include "fscache.h" 52 #include "dns_resolve.h" 53 #include "pnfs.h" 54 55 #define NFSDBG_FACILITY NFSDBG_VFS 56 57 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 58 59 /* Default is to see 64-bit inode numbers */ 60 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; 61 62 static void nfs_invalidate_inode(struct inode *); 63 static int nfs_update_inode(struct inode *, struct nfs_fattr *); 64 65 static struct kmem_cache * nfs_inode_cachep; 66 67 static inline unsigned long 68 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 69 { 70 return nfs_fileid_to_ino_t(fattr->fileid); 71 } 72 73 /** 74 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks 75 * @word: long word containing the bit lock 76 */ 77 int nfs_wait_bit_killable(void *word) 78 { 79 if (fatal_signal_pending(current)) 80 return -ERESTARTSYS; 81 freezable_schedule(); 82 return 0; 83 } 84 85 /** 86 * nfs_compat_user_ino64 - returns the user-visible inode number 87 * @fileid: 64-bit fileid 88 * 89 * This function returns a 32-bit inode number if the boot parameter 90 * nfs.enable_ino64 is zero. 91 */ 92 u64 nfs_compat_user_ino64(u64 fileid) 93 { 94 #ifdef CONFIG_COMPAT 95 compat_ulong_t ino; 96 #else 97 unsigned long ino; 98 #endif 99 100 if (enable_ino64) 101 return fileid; 102 ino = fileid; 103 if (sizeof(ino) < sizeof(fileid)) 104 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; 105 return ino; 106 } 107 108 static void nfs_clear_inode(struct inode *inode) 109 { 110 /* 111 * The following should never happen... 112 */ 113 BUG_ON(nfs_have_writebacks(inode)); 114 BUG_ON(!list_empty(&NFS_I(inode)->open_files)); 115 nfs_zap_acl_cache(inode); 116 nfs_access_zap_cache(inode); 117 nfs_fscache_release_inode_cookie(inode); 118 } 119 120 void nfs_evict_inode(struct inode *inode) 121 { 122 truncate_inode_pages(&inode->i_data, 0); 123 end_writeback(inode); 124 nfs_clear_inode(inode); 125 } 126 127 /** 128 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk 129 */ 130 int nfs_sync_mapping(struct address_space *mapping) 131 { 132 int ret = 0; 133 134 if (mapping->nrpages != 0) { 135 unmap_mapping_range(mapping, 0, 0, 0); 136 ret = nfs_wb_all(mapping->host); 137 } 138 return ret; 139 } 140 141 /* 142 * Invalidate the local caches 143 */ 144 static void nfs_zap_caches_locked(struct inode *inode) 145 { 146 struct nfs_inode *nfsi = NFS_I(inode); 147 int mode = inode->i_mode; 148 149 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 150 151 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 152 nfsi->attrtimeo_timestamp = jiffies; 153 154 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 155 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 156 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 157 else 158 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 159 } 160 161 void nfs_zap_caches(struct inode *inode) 162 { 163 spin_lock(&inode->i_lock); 164 nfs_zap_caches_locked(inode); 165 spin_unlock(&inode->i_lock); 166 } 167 168 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) 169 { 170 if (mapping->nrpages != 0) { 171 spin_lock(&inode->i_lock); 172 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 173 spin_unlock(&inode->i_lock); 174 } 175 } 176 177 void nfs_zap_acl_cache(struct inode *inode) 178 { 179 void (*clear_acl_cache)(struct inode *); 180 181 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 182 if (clear_acl_cache != NULL) 183 clear_acl_cache(inode); 184 spin_lock(&inode->i_lock); 185 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; 186 spin_unlock(&inode->i_lock); 187 } 188 189 void nfs_invalidate_atime(struct inode *inode) 190 { 191 spin_lock(&inode->i_lock); 192 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; 193 spin_unlock(&inode->i_lock); 194 } 195 196 /* 197 * Invalidate, but do not unhash, the inode. 198 * NB: must be called with inode->i_lock held! 199 */ 200 static void nfs_invalidate_inode(struct inode *inode) 201 { 202 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 203 nfs_zap_caches_locked(inode); 204 } 205 206 struct nfs_find_desc { 207 struct nfs_fh *fh; 208 struct nfs_fattr *fattr; 209 }; 210 211 /* 212 * In NFSv3 we can have 64bit inode numbers. In order to support 213 * this, and re-exported directories (also seen in NFSv2) 214 * we are forced to allow 2 different inodes to have the same 215 * i_ino. 216 */ 217 static int 218 nfs_find_actor(struct inode *inode, void *opaque) 219 { 220 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 221 struct nfs_fh *fh = desc->fh; 222 struct nfs_fattr *fattr = desc->fattr; 223 224 if (NFS_FILEID(inode) != fattr->fileid) 225 return 0; 226 if (nfs_compare_fh(NFS_FH(inode), fh)) 227 return 0; 228 if (is_bad_inode(inode) || NFS_STALE(inode)) 229 return 0; 230 return 1; 231 } 232 233 static int 234 nfs_init_locked(struct inode *inode, void *opaque) 235 { 236 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 237 struct nfs_fattr *fattr = desc->fattr; 238 239 set_nfs_fileid(inode, fattr->fileid); 240 nfs_copy_fh(NFS_FH(inode), desc->fh); 241 return 0; 242 } 243 244 /* 245 * This is our front-end to iget that looks up inodes by file handle 246 * instead of inode number. 247 */ 248 struct inode * 249 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 250 { 251 struct nfs_find_desc desc = { 252 .fh = fh, 253 .fattr = fattr 254 }; 255 struct inode *inode = ERR_PTR(-ENOENT); 256 unsigned long hash; 257 258 nfs_attr_check_mountpoint(sb, fattr); 259 260 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) && 261 !nfs_attr_use_mounted_on_fileid(fattr)) 262 goto out_no_inode; 263 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) 264 goto out_no_inode; 265 266 hash = nfs_fattr_to_ino_t(fattr); 267 268 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); 269 if (inode == NULL) { 270 inode = ERR_PTR(-ENOMEM); 271 goto out_no_inode; 272 } 273 274 if (inode->i_state & I_NEW) { 275 struct nfs_inode *nfsi = NFS_I(inode); 276 unsigned long now = jiffies; 277 278 /* We set i_ino for the few things that still rely on it, 279 * such as stat(2) */ 280 inode->i_ino = hash; 281 282 /* We can't support update_atime(), since the server will reset it */ 283 inode->i_flags |= S_NOATIME|S_NOCMTIME; 284 inode->i_mode = fattr->mode; 285 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 286 && nfs_server_capable(inode, NFS_CAP_MODE)) 287 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 288 | NFS_INO_INVALID_ACCESS 289 | NFS_INO_INVALID_ACL; 290 /* Why so? Because we want revalidate for devices/FIFOs, and 291 * that's precisely what we have in nfs_file_inode_operations. 292 */ 293 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; 294 if (S_ISREG(inode->i_mode)) { 295 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; 296 inode->i_data.a_ops = &nfs_file_aops; 297 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 298 } else if (S_ISDIR(inode->i_mode)) { 299 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; 300 inode->i_fop = &nfs_dir_operations; 301 inode->i_data.a_ops = &nfs_dir_aops; 302 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)) 303 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 304 /* Deal with crossing mountpoints */ 305 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || 306 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { 307 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) 308 inode->i_op = &nfs_referral_inode_operations; 309 else 310 inode->i_op = &nfs_mountpoint_inode_operations; 311 inode->i_fop = NULL; 312 inode->i_flags |= S_AUTOMOUNT; 313 } 314 } else if (S_ISLNK(inode->i_mode)) 315 inode->i_op = &nfs_symlink_inode_operations; 316 else 317 init_special_inode(inode, inode->i_mode, fattr->rdev); 318 319 memset(&inode->i_atime, 0, sizeof(inode->i_atime)); 320 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); 321 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); 322 inode->i_version = 0; 323 inode->i_size = 0; 324 clear_nlink(inode); 325 inode->i_uid = -2; 326 inode->i_gid = -2; 327 inode->i_blocks = 0; 328 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 329 330 nfsi->read_cache_jiffies = fattr->time_start; 331 nfsi->attr_gencount = fattr->gencount; 332 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 333 inode->i_atime = fattr->atime; 334 else if (nfs_server_capable(inode, NFS_CAP_ATIME)) 335 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 336 if (fattr->valid & NFS_ATTR_FATTR_MTIME) 337 inode->i_mtime = fattr->mtime; 338 else if (nfs_server_capable(inode, NFS_CAP_MTIME)) 339 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 340 | NFS_INO_INVALID_DATA; 341 if (fattr->valid & NFS_ATTR_FATTR_CTIME) 342 inode->i_ctime = fattr->ctime; 343 else if (nfs_server_capable(inode, NFS_CAP_CTIME)) 344 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 345 | NFS_INO_INVALID_ACCESS 346 | NFS_INO_INVALID_ACL; 347 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) 348 inode->i_version = fattr->change_attr; 349 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) 350 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 351 | NFS_INO_INVALID_DATA; 352 if (fattr->valid & NFS_ATTR_FATTR_SIZE) 353 inode->i_size = nfs_size_to_loff_t(fattr->size); 354 else 355 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 356 | NFS_INO_INVALID_DATA 357 | NFS_INO_REVAL_PAGECACHE; 358 if (fattr->valid & NFS_ATTR_FATTR_NLINK) 359 set_nlink(inode, fattr->nlink); 360 else if (nfs_server_capable(inode, NFS_CAP_NLINK)) 361 nfsi->cache_validity |= NFS_INO_INVALID_ATTR; 362 if (fattr->valid & NFS_ATTR_FATTR_OWNER) 363 inode->i_uid = fattr->uid; 364 else if (nfs_server_capable(inode, NFS_CAP_OWNER)) 365 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 366 | NFS_INO_INVALID_ACCESS 367 | NFS_INO_INVALID_ACL; 368 if (fattr->valid & NFS_ATTR_FATTR_GROUP) 369 inode->i_gid = fattr->gid; 370 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) 371 nfsi->cache_validity |= NFS_INO_INVALID_ATTR 372 | NFS_INO_INVALID_ACCESS 373 | NFS_INO_INVALID_ACL; 374 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 375 inode->i_blocks = fattr->du.nfs2.blocks; 376 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 377 /* 378 * report the blocks in 512byte units 379 */ 380 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 381 } 382 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 383 nfsi->attrtimeo_timestamp = now; 384 nfsi->access_cache = RB_ROOT; 385 386 nfs_fscache_init_inode_cookie(inode); 387 388 unlock_new_inode(inode); 389 } else 390 nfs_refresh_inode(inode, fattr); 391 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 392 inode->i_sb->s_id, 393 (long long)NFS_FILEID(inode), 394 atomic_read(&inode->i_count)); 395 396 out: 397 return inode; 398 399 out_no_inode: 400 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); 401 goto out; 402 } 403 404 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE) 405 406 int 407 nfs_setattr(struct dentry *dentry, struct iattr *attr) 408 { 409 struct inode *inode = dentry->d_inode; 410 struct nfs_fattr *fattr; 411 int error = -ENOMEM; 412 413 nfs_inc_stats(inode, NFSIOS_VFSSETATTR); 414 415 /* skip mode change if it's just for clearing setuid/setgid */ 416 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) 417 attr->ia_valid &= ~ATTR_MODE; 418 419 if (attr->ia_valid & ATTR_SIZE) { 420 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 421 attr->ia_valid &= ~ATTR_SIZE; 422 } 423 424 /* Optimization: if the end result is no change, don't RPC */ 425 attr->ia_valid &= NFS_VALID_ATTRS; 426 if ((attr->ia_valid & ~ATTR_FILE) == 0) 427 return 0; 428 429 /* Write all dirty data */ 430 if (S_ISREG(inode->i_mode)) 431 nfs_wb_all(inode); 432 433 fattr = nfs_alloc_fattr(); 434 if (fattr == NULL) 435 goto out; 436 /* 437 * Return any delegations if we're going to change ACLs 438 */ 439 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 440 nfs_inode_return_delegation(inode); 441 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); 442 if (error == 0) 443 nfs_refresh_inode(inode, fattr); 444 nfs_free_fattr(fattr); 445 out: 446 return error; 447 } 448 449 /** 450 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall 451 * @inode: inode of the file used 452 * @offset: file offset to start truncating 453 * 454 * This is a copy of the common vmtruncate, but with the locking 455 * corrected to take into account the fact that NFS requires 456 * inode->i_size to be updated under the inode->i_lock. 457 */ 458 static int nfs_vmtruncate(struct inode * inode, loff_t offset) 459 { 460 loff_t oldsize; 461 int err; 462 463 err = inode_newsize_ok(inode, offset); 464 if (err) 465 goto out; 466 467 spin_lock(&inode->i_lock); 468 oldsize = inode->i_size; 469 i_size_write(inode, offset); 470 spin_unlock(&inode->i_lock); 471 472 truncate_pagecache(inode, oldsize, offset); 473 out: 474 return err; 475 } 476 477 /** 478 * nfs_setattr_update_inode - Update inode metadata after a setattr call. 479 * @inode: pointer to struct inode 480 * @attr: pointer to struct iattr 481 * 482 * Note: we do this in the *proc.c in order to ensure that 483 * it works for things like exclusive creates too. 484 */ 485 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) 486 { 487 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { 488 spin_lock(&inode->i_lock); 489 if ((attr->ia_valid & ATTR_MODE) != 0) { 490 int mode = attr->ia_mode & S_IALLUGO; 491 mode |= inode->i_mode & ~S_IALLUGO; 492 inode->i_mode = mode; 493 } 494 if ((attr->ia_valid & ATTR_UID) != 0) 495 inode->i_uid = attr->ia_uid; 496 if ((attr->ia_valid & ATTR_GID) != 0) 497 inode->i_gid = attr->ia_gid; 498 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 499 spin_unlock(&inode->i_lock); 500 } 501 if ((attr->ia_valid & ATTR_SIZE) != 0) { 502 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); 503 nfs_vmtruncate(inode, attr->ia_size); 504 } 505 } 506 507 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 508 { 509 struct inode *inode = dentry->d_inode; 510 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; 511 int err; 512 513 /* Flush out writes to the server in order to update c/mtime. */ 514 if (S_ISREG(inode->i_mode)) { 515 err = filemap_write_and_wait(inode->i_mapping); 516 if (err) 517 goto out; 518 } 519 520 /* 521 * We may force a getattr if the user cares about atime. 522 * 523 * Note that we only have to check the vfsmount flags here: 524 * - NFS always sets S_NOATIME by so checking it would give a 525 * bogus result 526 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is 527 * no point in checking those. 528 */ 529 if ((mnt->mnt_flags & MNT_NOATIME) || 530 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) 531 need_atime = 0; 532 533 if (need_atime) 534 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 535 else 536 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 537 if (!err) { 538 generic_fillattr(inode, stat); 539 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); 540 } 541 out: 542 return err; 543 } 544 545 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) 546 { 547 atomic_set(&l_ctx->count, 1); 548 l_ctx->lockowner = current->files; 549 l_ctx->pid = current->tgid; 550 INIT_LIST_HEAD(&l_ctx->list); 551 } 552 553 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) 554 { 555 struct nfs_lock_context *pos; 556 557 list_for_each_entry(pos, &ctx->lock_context.list, list) { 558 if (pos->lockowner != current->files) 559 continue; 560 if (pos->pid != current->tgid) 561 continue; 562 atomic_inc(&pos->count); 563 return pos; 564 } 565 return NULL; 566 } 567 568 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) 569 { 570 struct nfs_lock_context *res, *new = NULL; 571 struct inode *inode = ctx->dentry->d_inode; 572 573 spin_lock(&inode->i_lock); 574 res = __nfs_find_lock_context(ctx); 575 if (res == NULL) { 576 spin_unlock(&inode->i_lock); 577 new = kmalloc(sizeof(*new), GFP_KERNEL); 578 if (new == NULL) 579 return NULL; 580 nfs_init_lock_context(new); 581 spin_lock(&inode->i_lock); 582 res = __nfs_find_lock_context(ctx); 583 if (res == NULL) { 584 list_add_tail(&new->list, &ctx->lock_context.list); 585 new->open_context = ctx; 586 res = new; 587 new = NULL; 588 } 589 } 590 spin_unlock(&inode->i_lock); 591 kfree(new); 592 return res; 593 } 594 595 void nfs_put_lock_context(struct nfs_lock_context *l_ctx) 596 { 597 struct nfs_open_context *ctx = l_ctx->open_context; 598 struct inode *inode = ctx->dentry->d_inode; 599 600 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) 601 return; 602 list_del(&l_ctx->list); 603 spin_unlock(&inode->i_lock); 604 kfree(l_ctx); 605 } 606 607 /** 608 * nfs_close_context - Common close_context() routine NFSv2/v3 609 * @ctx: pointer to context 610 * @is_sync: is this a synchronous close 611 * 612 * always ensure that the attributes are up to date if we're mounted 613 * with close-to-open semantics 614 */ 615 void nfs_close_context(struct nfs_open_context *ctx, int is_sync) 616 { 617 struct inode *inode; 618 struct nfs_server *server; 619 620 if (!(ctx->mode & FMODE_WRITE)) 621 return; 622 if (!is_sync) 623 return; 624 inode = ctx->dentry->d_inode; 625 if (!list_empty(&NFS_I(inode)->open_files)) 626 return; 627 server = NFS_SERVER(inode); 628 if (server->flags & NFS_MOUNT_NOCTO) 629 return; 630 nfs_revalidate_inode(server, inode); 631 } 632 633 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode) 634 { 635 struct nfs_open_context *ctx; 636 struct rpc_cred *cred = rpc_lookup_cred(); 637 if (IS_ERR(cred)) 638 return ERR_CAST(cred); 639 640 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 641 if (!ctx) { 642 put_rpccred(cred); 643 return ERR_PTR(-ENOMEM); 644 } 645 nfs_sb_active(dentry->d_sb); 646 ctx->dentry = dget(dentry); 647 ctx->cred = cred; 648 ctx->state = NULL; 649 ctx->mode = f_mode; 650 ctx->flags = 0; 651 ctx->error = 0; 652 nfs_init_lock_context(&ctx->lock_context); 653 ctx->lock_context.open_context = ctx; 654 INIT_LIST_HEAD(&ctx->list); 655 return ctx; 656 } 657 658 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 659 { 660 if (ctx != NULL) 661 atomic_inc(&ctx->lock_context.count); 662 return ctx; 663 } 664 665 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) 666 { 667 struct inode *inode = ctx->dentry->d_inode; 668 struct super_block *sb = ctx->dentry->d_sb; 669 670 if (!list_empty(&ctx->list)) { 671 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) 672 return; 673 list_del(&ctx->list); 674 spin_unlock(&inode->i_lock); 675 } else if (!atomic_dec_and_test(&ctx->lock_context.count)) 676 return; 677 if (inode != NULL) 678 NFS_PROTO(inode)->close_context(ctx, is_sync); 679 if (ctx->cred != NULL) 680 put_rpccred(ctx->cred); 681 dput(ctx->dentry); 682 nfs_sb_deactive(sb); 683 kfree(ctx); 684 } 685 686 void put_nfs_open_context(struct nfs_open_context *ctx) 687 { 688 __put_nfs_open_context(ctx, 0); 689 } 690 691 /* 692 * Ensure that mmap has a recent RPC credential for use when writing out 693 * shared pages 694 */ 695 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 696 { 697 struct inode *inode = filp->f_path.dentry->d_inode; 698 struct nfs_inode *nfsi = NFS_I(inode); 699 700 filp->private_data = get_nfs_open_context(ctx); 701 spin_lock(&inode->i_lock); 702 list_add(&ctx->list, &nfsi->open_files); 703 spin_unlock(&inode->i_lock); 704 } 705 706 /* 707 * Given an inode, search for an open context with the desired characteristics 708 */ 709 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) 710 { 711 struct nfs_inode *nfsi = NFS_I(inode); 712 struct nfs_open_context *pos, *ctx = NULL; 713 714 spin_lock(&inode->i_lock); 715 list_for_each_entry(pos, &nfsi->open_files, list) { 716 if (cred != NULL && pos->cred != cred) 717 continue; 718 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) 719 continue; 720 ctx = get_nfs_open_context(pos); 721 break; 722 } 723 spin_unlock(&inode->i_lock); 724 return ctx; 725 } 726 727 static void nfs_file_clear_open_context(struct file *filp) 728 { 729 struct inode *inode = filp->f_path.dentry->d_inode; 730 struct nfs_open_context *ctx = nfs_file_open_context(filp); 731 732 if (ctx) { 733 filp->private_data = NULL; 734 spin_lock(&inode->i_lock); 735 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 736 spin_unlock(&inode->i_lock); 737 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); 738 } 739 } 740 741 /* 742 * These allocate and release file read/write context information. 743 */ 744 int nfs_open(struct inode *inode, struct file *filp) 745 { 746 struct nfs_open_context *ctx; 747 748 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); 749 if (IS_ERR(ctx)) 750 return PTR_ERR(ctx); 751 nfs_file_set_open_context(filp, ctx); 752 put_nfs_open_context(ctx); 753 nfs_fscache_set_inode_cookie(inode, filp); 754 return 0; 755 } 756 757 int nfs_release(struct inode *inode, struct file *filp) 758 { 759 nfs_file_clear_open_context(filp); 760 return 0; 761 } 762 763 /* 764 * This function is called whenever some part of NFS notices that 765 * the cached attributes have to be refreshed. 766 */ 767 int 768 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 769 { 770 int status = -ESTALE; 771 struct nfs_fattr *fattr = NULL; 772 struct nfs_inode *nfsi = NFS_I(inode); 773 774 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 775 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 776 777 if (is_bad_inode(inode)) 778 goto out; 779 if (NFS_STALE(inode)) 780 goto out; 781 782 status = -ENOMEM; 783 fattr = nfs_alloc_fattr(); 784 if (fattr == NULL) 785 goto out; 786 787 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); 788 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr); 789 if (status != 0) { 790 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 791 inode->i_sb->s_id, 792 (long long)NFS_FILEID(inode), status); 793 if (status == -ESTALE) { 794 nfs_zap_caches(inode); 795 if (!S_ISDIR(inode->i_mode)) 796 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 797 } 798 goto out; 799 } 800 801 status = nfs_refresh_inode(inode, fattr); 802 if (status) { 803 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 804 inode->i_sb->s_id, 805 (long long)NFS_FILEID(inode), status); 806 goto out; 807 } 808 809 if (nfsi->cache_validity & NFS_INO_INVALID_ACL) 810 nfs_zap_acl_cache(inode); 811 812 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 813 inode->i_sb->s_id, 814 (long long)NFS_FILEID(inode)); 815 816 out: 817 nfs_free_fattr(fattr); 818 return status; 819 } 820 821 int nfs_attribute_timeout(struct inode *inode) 822 { 823 struct nfs_inode *nfsi = NFS_I(inode); 824 825 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); 826 } 827 828 static int nfs_attribute_cache_expired(struct inode *inode) 829 { 830 if (nfs_have_delegated_attributes(inode)) 831 return 0; 832 return nfs_attribute_timeout(inode); 833 } 834 835 /** 836 * nfs_revalidate_inode - Revalidate the inode attributes 837 * @server - pointer to nfs_server struct 838 * @inode - pointer to inode struct 839 * 840 * Updates inode attribute information by retrieving the data from the server. 841 */ 842 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 843 { 844 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) 845 && !nfs_attribute_cache_expired(inode)) 846 return NFS_STALE(inode) ? -ESTALE : 0; 847 return __nfs_revalidate_inode(server, inode); 848 } 849 850 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) 851 { 852 struct nfs_inode *nfsi = NFS_I(inode); 853 854 if (mapping->nrpages != 0) { 855 int ret = invalidate_inode_pages2(mapping); 856 if (ret < 0) 857 return ret; 858 } 859 spin_lock(&inode->i_lock); 860 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; 861 if (S_ISDIR(inode->i_mode)) 862 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 863 spin_unlock(&inode->i_lock); 864 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); 865 nfs_fscache_reset_inode_cookie(inode); 866 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 867 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 868 return 0; 869 } 870 871 /** 872 * nfs_revalidate_mapping - Revalidate the pagecache 873 * @inode - pointer to host inode 874 * @mapping - pointer to mapping 875 */ 876 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 877 { 878 struct nfs_inode *nfsi = NFS_I(inode); 879 int ret = 0; 880 881 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) 882 || nfs_attribute_cache_expired(inode) 883 || NFS_STALE(inode)) { 884 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 885 if (ret < 0) 886 goto out; 887 } 888 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) 889 ret = nfs_invalidate_mapping(inode, mapping); 890 out: 891 return ret; 892 } 893 894 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) 895 { 896 struct nfs_inode *nfsi = NFS_I(inode); 897 unsigned long ret = 0; 898 899 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) 900 && (fattr->valid & NFS_ATTR_FATTR_CHANGE) 901 && inode->i_version == fattr->pre_change_attr) { 902 inode->i_version = fattr->change_attr; 903 if (S_ISDIR(inode->i_mode)) 904 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 905 ret |= NFS_INO_INVALID_ATTR; 906 } 907 /* If we have atomic WCC data, we may update some attributes */ 908 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) 909 && (fattr->valid & NFS_ATTR_FATTR_CTIME) 910 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { 911 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 912 ret |= NFS_INO_INVALID_ATTR; 913 } 914 915 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) 916 && (fattr->valid & NFS_ATTR_FATTR_MTIME) 917 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { 918 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 919 if (S_ISDIR(inode->i_mode)) 920 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 921 ret |= NFS_INO_INVALID_ATTR; 922 } 923 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) 924 && (fattr->valid & NFS_ATTR_FATTR_SIZE) 925 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) 926 && nfsi->npages == 0) { 927 i_size_write(inode, nfs_size_to_loff_t(fattr->size)); 928 ret |= NFS_INO_INVALID_ATTR; 929 } 930 return ret; 931 } 932 933 /** 934 * nfs_check_inode_attributes - verify consistency of the inode attribute cache 935 * @inode - pointer to inode 936 * @fattr - updated attributes 937 * 938 * Verifies the attribute cache. If we have just changed the attributes, 939 * so that fattr carries weak cache consistency data, then it may 940 * also update the ctime/mtime/change_attribute. 941 */ 942 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) 943 { 944 struct nfs_inode *nfsi = NFS_I(inode); 945 loff_t cur_size, new_isize; 946 unsigned long invalid = 0; 947 948 949 /* Has the inode gone and changed behind our back? */ 950 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 951 return -EIO; 952 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 953 return -EIO; 954 955 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 956 inode->i_version != fattr->change_attr) 957 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 958 959 /* Verify a few of the more important attributes */ 960 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) 961 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 962 963 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 964 cur_size = i_size_read(inode); 965 new_isize = nfs_size_to_loff_t(fattr->size); 966 if (cur_size != new_isize && nfsi->npages == 0) 967 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 968 } 969 970 /* Have any file permissions changed? */ 971 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) 972 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 973 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid) 974 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 975 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid) 976 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 977 978 /* Has the link count changed? */ 979 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) 980 invalid |= NFS_INO_INVALID_ATTR; 981 982 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) 983 invalid |= NFS_INO_INVALID_ATIME; 984 985 if (invalid != 0) 986 nfsi->cache_validity |= invalid; 987 988 nfsi->read_cache_jiffies = fattr->time_start; 989 return 0; 990 } 991 992 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 993 { 994 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) 995 return 0; 996 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; 997 } 998 999 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1000 { 1001 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) 1002 return 0; 1003 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); 1004 } 1005 1006 static atomic_long_t nfs_attr_generation_counter; 1007 1008 static unsigned long nfs_read_attr_generation_counter(void) 1009 { 1010 return atomic_long_read(&nfs_attr_generation_counter); 1011 } 1012 1013 unsigned long nfs_inc_attr_generation_counter(void) 1014 { 1015 return atomic_long_inc_return(&nfs_attr_generation_counter); 1016 } 1017 1018 void nfs_fattr_init(struct nfs_fattr *fattr) 1019 { 1020 fattr->valid = 0; 1021 fattr->time_start = jiffies; 1022 fattr->gencount = nfs_inc_attr_generation_counter(); 1023 fattr->owner_name = NULL; 1024 fattr->group_name = NULL; 1025 } 1026 1027 struct nfs_fattr *nfs_alloc_fattr(void) 1028 { 1029 struct nfs_fattr *fattr; 1030 1031 fattr = kmalloc(sizeof(*fattr), GFP_NOFS); 1032 if (fattr != NULL) 1033 nfs_fattr_init(fattr); 1034 return fattr; 1035 } 1036 1037 struct nfs_fh *nfs_alloc_fhandle(void) 1038 { 1039 struct nfs_fh *fh; 1040 1041 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); 1042 if (fh != NULL) 1043 fh->size = 0; 1044 return fh; 1045 } 1046 1047 /** 1048 * nfs_inode_attrs_need_update - check if the inode attributes need updating 1049 * @inode - pointer to inode 1050 * @fattr - attributes 1051 * 1052 * Attempt to divine whether or not an RPC call reply carrying stale 1053 * attributes got scheduled after another call carrying updated ones. 1054 * 1055 * To do so, the function first assumes that a more recent ctime means 1056 * that the attributes in fattr are newer, however it also attempt to 1057 * catch the case where ctime either didn't change, or went backwards 1058 * (if someone reset the clock on the server) by looking at whether 1059 * or not this RPC call was started after the inode was last updated. 1060 * Note also the check for wraparound of 'attr_gencount' 1061 * 1062 * The function returns 'true' if it thinks the attributes in 'fattr' are 1063 * more recent than the ones cached in the inode. 1064 * 1065 */ 1066 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) 1067 { 1068 const struct nfs_inode *nfsi = NFS_I(inode); 1069 1070 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || 1071 nfs_ctime_need_update(inode, fattr) || 1072 nfs_size_need_update(inode, fattr) || 1073 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); 1074 } 1075 1076 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1077 { 1078 if (nfs_inode_attrs_need_update(inode, fattr)) 1079 return nfs_update_inode(inode, fattr); 1080 return nfs_check_inode_attributes(inode, fattr); 1081 } 1082 1083 /** 1084 * nfs_refresh_inode - try to update the inode attribute cache 1085 * @inode - pointer to inode 1086 * @fattr - updated attributes 1087 * 1088 * Check that an RPC call that returned attributes has not overlapped with 1089 * other recent updates of the inode metadata, then decide whether it is 1090 * safe to do a full update of the inode attributes, or whether just to 1091 * call nfs_check_inode_attributes. 1092 */ 1093 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1094 { 1095 int status; 1096 1097 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1098 return 0; 1099 spin_lock(&inode->i_lock); 1100 status = nfs_refresh_inode_locked(inode, fattr); 1101 spin_unlock(&inode->i_lock); 1102 1103 return status; 1104 } 1105 1106 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) 1107 { 1108 struct nfs_inode *nfsi = NFS_I(inode); 1109 1110 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; 1111 if (S_ISDIR(inode->i_mode)) 1112 nfsi->cache_validity |= NFS_INO_INVALID_DATA; 1113 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1114 return 0; 1115 return nfs_refresh_inode_locked(inode, fattr); 1116 } 1117 1118 /** 1119 * nfs_post_op_update_inode - try to update the inode attribute cache 1120 * @inode - pointer to inode 1121 * @fattr - updated attributes 1122 * 1123 * After an operation that has changed the inode metadata, mark the 1124 * attribute cache as being invalid, then try to update it. 1125 * 1126 * NB: if the server didn't return any post op attributes, this 1127 * function will force the retrieval of attributes before the next 1128 * NFS request. Thus it should be used only for operations that 1129 * are expected to change one or more attributes, to avoid 1130 * unnecessary NFS requests and trips through nfs_update_inode(). 1131 */ 1132 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1133 { 1134 int status; 1135 1136 spin_lock(&inode->i_lock); 1137 status = nfs_post_op_update_inode_locked(inode, fattr); 1138 spin_unlock(&inode->i_lock); 1139 return status; 1140 } 1141 1142 /** 1143 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache 1144 * @inode - pointer to inode 1145 * @fattr - updated attributes 1146 * 1147 * After an operation that has changed the inode metadata, mark the 1148 * attribute cache as being invalid, then try to update it. Fake up 1149 * weak cache consistency data, if none exist. 1150 * 1151 * This function is mainly designed to be used by the ->write_done() functions. 1152 */ 1153 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) 1154 { 1155 int status; 1156 1157 spin_lock(&inode->i_lock); 1158 /* Don't do a WCC update if these attributes are already stale */ 1159 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || 1160 !nfs_inode_attrs_need_update(inode, fattr)) { 1161 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE 1162 | NFS_ATTR_FATTR_PRESIZE 1163 | NFS_ATTR_FATTR_PREMTIME 1164 | NFS_ATTR_FATTR_PRECTIME); 1165 goto out_noforce; 1166 } 1167 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && 1168 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { 1169 fattr->pre_change_attr = inode->i_version; 1170 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 1171 } 1172 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && 1173 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { 1174 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); 1175 fattr->valid |= NFS_ATTR_FATTR_PRECTIME; 1176 } 1177 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && 1178 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { 1179 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); 1180 fattr->valid |= NFS_ATTR_FATTR_PREMTIME; 1181 } 1182 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && 1183 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { 1184 fattr->pre_size = i_size_read(inode); 1185 fattr->valid |= NFS_ATTR_FATTR_PRESIZE; 1186 } 1187 out_noforce: 1188 status = nfs_post_op_update_inode_locked(inode, fattr); 1189 spin_unlock(&inode->i_lock); 1190 return status; 1191 } 1192 1193 /* 1194 * Many nfs protocol calls return the new file attributes after 1195 * an operation. Here we update the inode to reflect the state 1196 * of the server's inode. 1197 * 1198 * This is a bit tricky because we have to make sure all dirty pages 1199 * have been sent off to the server before calling invalidate_inode_pages. 1200 * To make sure no other process adds more write requests while we try 1201 * our best to flush them, we make them sleep during the attribute refresh. 1202 * 1203 * A very similar scenario holds for the dir cache. 1204 */ 1205 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) 1206 { 1207 struct nfs_server *server; 1208 struct nfs_inode *nfsi = NFS_I(inode); 1209 loff_t cur_isize, new_isize; 1210 unsigned long invalid = 0; 1211 unsigned long now = jiffies; 1212 unsigned long save_cache_validity; 1213 1214 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 1215 __func__, inode->i_sb->s_id, inode->i_ino, 1216 atomic_read(&inode->i_count), fattr->valid); 1217 1218 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) 1219 goto out_fileid; 1220 1221 /* 1222 * Make sure the inode's type hasn't changed. 1223 */ 1224 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1225 goto out_changed; 1226 1227 server = NFS_SERVER(inode); 1228 /* Update the fsid? */ 1229 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && 1230 !nfs_fsid_equal(&server->fsid, &fattr->fsid) && 1231 !IS_AUTOMOUNT(inode)) 1232 server->fsid = fattr->fsid; 1233 1234 /* 1235 * Update the read time so we don't revalidate too often. 1236 */ 1237 nfsi->read_cache_jiffies = fattr->time_start; 1238 1239 save_cache_validity = nfsi->cache_validity; 1240 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR 1241 | NFS_INO_INVALID_ATIME 1242 | NFS_INO_REVAL_FORCED 1243 | NFS_INO_REVAL_PAGECACHE); 1244 1245 /* Do atomic weak cache consistency updates */ 1246 invalid |= nfs_wcc_update_inode(inode, fattr); 1247 1248 /* More cache consistency checks */ 1249 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { 1250 if (inode->i_version != fattr->change_attr) { 1251 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1252 inode->i_sb->s_id, inode->i_ino); 1253 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1254 if (S_ISDIR(inode->i_mode)) 1255 nfs_force_lookup_revalidate(inode); 1256 inode->i_version = fattr->change_attr; 1257 } 1258 } else if (server->caps & NFS_CAP_CHANGE_ATTR) 1259 invalid |= save_cache_validity; 1260 1261 if (fattr->valid & NFS_ATTR_FATTR_MTIME) { 1262 /* NFSv2/v3: Check if the mtime agrees */ 1263 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1264 dprintk("NFS: mtime change on server for file %s/%ld\n", 1265 inode->i_sb->s_id, inode->i_ino); 1266 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1267 if (S_ISDIR(inode->i_mode)) 1268 nfs_force_lookup_revalidate(inode); 1269 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1270 } 1271 } else if (server->caps & NFS_CAP_MTIME) 1272 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1273 | NFS_INO_INVALID_DATA 1274 | NFS_INO_REVAL_PAGECACHE 1275 | NFS_INO_REVAL_FORCED); 1276 1277 if (fattr->valid & NFS_ATTR_FATTR_CTIME) { 1278 /* If ctime has changed we should definitely clear access+acl caches */ 1279 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { 1280 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1281 /* and probably clear data for a directory too as utimes can cause 1282 * havoc with our cache. 1283 */ 1284 if (S_ISDIR(inode->i_mode)) { 1285 invalid |= NFS_INO_INVALID_DATA; 1286 nfs_force_lookup_revalidate(inode); 1287 } 1288 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1289 } 1290 } else if (server->caps & NFS_CAP_CTIME) 1291 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1292 | NFS_INO_INVALID_ACCESS 1293 | NFS_INO_INVALID_ACL 1294 | NFS_INO_REVAL_FORCED); 1295 1296 /* Check if our cached file size is stale */ 1297 if (fattr->valid & NFS_ATTR_FATTR_SIZE) { 1298 new_isize = nfs_size_to_loff_t(fattr->size); 1299 cur_isize = i_size_read(inode); 1300 if (new_isize != cur_isize) { 1301 /* Do we perhaps have any outstanding writes, or has 1302 * the file grown beyond our last write? */ 1303 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) || 1304 new_isize > cur_isize) { 1305 i_size_write(inode, new_isize); 1306 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1307 } 1308 dprintk("NFS: isize change on server for file %s/%ld " 1309 "(%Ld to %Ld)\n", 1310 inode->i_sb->s_id, 1311 inode->i_ino, 1312 (long long)cur_isize, 1313 (long long)new_isize); 1314 } 1315 } else 1316 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1317 | NFS_INO_REVAL_PAGECACHE 1318 | NFS_INO_REVAL_FORCED); 1319 1320 1321 if (fattr->valid & NFS_ATTR_FATTR_ATIME) 1322 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1323 else if (server->caps & NFS_CAP_ATIME) 1324 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME 1325 | NFS_INO_REVAL_FORCED); 1326 1327 if (fattr->valid & NFS_ATTR_FATTR_MODE) { 1328 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { 1329 umode_t newmode = inode->i_mode & S_IFMT; 1330 newmode |= fattr->mode & S_IALLUGO; 1331 inode->i_mode = newmode; 1332 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1333 } 1334 } else if (server->caps & NFS_CAP_MODE) 1335 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1336 | NFS_INO_INVALID_ACCESS 1337 | NFS_INO_INVALID_ACL 1338 | NFS_INO_REVAL_FORCED); 1339 1340 if (fattr->valid & NFS_ATTR_FATTR_OWNER) { 1341 if (inode->i_uid != fattr->uid) { 1342 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1343 inode->i_uid = fattr->uid; 1344 } 1345 } else if (server->caps & NFS_CAP_OWNER) 1346 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1347 | NFS_INO_INVALID_ACCESS 1348 | NFS_INO_INVALID_ACL 1349 | NFS_INO_REVAL_FORCED); 1350 1351 if (fattr->valid & NFS_ATTR_FATTR_GROUP) { 1352 if (inode->i_gid != fattr->gid) { 1353 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1354 inode->i_gid = fattr->gid; 1355 } 1356 } else if (server->caps & NFS_CAP_OWNER_GROUP) 1357 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1358 | NFS_INO_INVALID_ACCESS 1359 | NFS_INO_INVALID_ACL 1360 | NFS_INO_REVAL_FORCED); 1361 1362 if (fattr->valid & NFS_ATTR_FATTR_NLINK) { 1363 if (inode->i_nlink != fattr->nlink) { 1364 invalid |= NFS_INO_INVALID_ATTR; 1365 if (S_ISDIR(inode->i_mode)) 1366 invalid |= NFS_INO_INVALID_DATA; 1367 set_nlink(inode, fattr->nlink); 1368 } 1369 } else if (server->caps & NFS_CAP_NLINK) 1370 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR 1371 | NFS_INO_REVAL_FORCED); 1372 1373 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { 1374 /* 1375 * report the blocks in 512byte units 1376 */ 1377 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1378 } 1379 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) 1380 inode->i_blocks = fattr->du.nfs2.blocks; 1381 1382 /* Update attrtimeo value if we're out of the unstable period */ 1383 if (invalid & NFS_INO_INVALID_ATTR) { 1384 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); 1385 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1386 nfsi->attrtimeo_timestamp = now; 1387 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1388 } else { 1389 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { 1390 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1391 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1392 nfsi->attrtimeo_timestamp = now; 1393 } 1394 } 1395 invalid &= ~NFS_INO_INVALID_ATTR; 1396 /* Don't invalidate the data if we were to blame */ 1397 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1398 || S_ISLNK(inode->i_mode))) 1399 invalid &= ~NFS_INO_INVALID_DATA; 1400 if (!nfs_have_delegation(inode, FMODE_READ) || 1401 (save_cache_validity & NFS_INO_REVAL_FORCED)) 1402 nfsi->cache_validity |= invalid; 1403 1404 return 0; 1405 out_changed: 1406 /* 1407 * Big trouble! The inode has become a different object. 1408 */ 1409 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1410 __func__, inode->i_ino, inode->i_mode, fattr->mode); 1411 out_err: 1412 /* 1413 * No need to worry about unhashing the dentry, as the 1414 * lookup validation will know that the inode is bad. 1415 * (But we fall through to invalidate the caches.) 1416 */ 1417 nfs_invalidate_inode(inode); 1418 return -ESTALE; 1419 1420 out_fileid: 1421 printk(KERN_ERR "NFS: server %s error: fileid changed\n" 1422 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", 1423 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, 1424 (long long)nfsi->fileid, (long long)fattr->fileid); 1425 goto out_err; 1426 } 1427 1428 1429 #ifdef CONFIG_NFS_V4 1430 1431 /* 1432 * Clean out any remaining NFSv4 state that might be left over due 1433 * to open() calls that passed nfs_atomic_lookup, but failed to call 1434 * nfs_open(). 1435 */ 1436 void nfs4_evict_inode(struct inode *inode) 1437 { 1438 truncate_inode_pages(&inode->i_data, 0); 1439 end_writeback(inode); 1440 pnfs_return_layout(inode); 1441 pnfs_destroy_layout(NFS_I(inode)); 1442 /* If we are holding a delegation, return it! */ 1443 nfs_inode_return_delegation_noreclaim(inode); 1444 /* First call standard NFS clear_inode() code */ 1445 nfs_clear_inode(inode); 1446 } 1447 #endif 1448 1449 struct inode *nfs_alloc_inode(struct super_block *sb) 1450 { 1451 struct nfs_inode *nfsi; 1452 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); 1453 if (!nfsi) 1454 return NULL; 1455 nfsi->flags = 0UL; 1456 nfsi->cache_validity = 0UL; 1457 #ifdef CONFIG_NFS_V3_ACL 1458 nfsi->acl_access = ERR_PTR(-EAGAIN); 1459 nfsi->acl_default = ERR_PTR(-EAGAIN); 1460 #endif 1461 #ifdef CONFIG_NFS_V4 1462 nfsi->nfs4_acl = NULL; 1463 #endif /* CONFIG_NFS_V4 */ 1464 return &nfsi->vfs_inode; 1465 } 1466 1467 static void nfs_i_callback(struct rcu_head *head) 1468 { 1469 struct inode *inode = container_of(head, struct inode, i_rcu); 1470 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1471 } 1472 1473 void nfs_destroy_inode(struct inode *inode) 1474 { 1475 call_rcu(&inode->i_rcu, nfs_i_callback); 1476 } 1477 1478 static inline void nfs4_init_once(struct nfs_inode *nfsi) 1479 { 1480 #ifdef CONFIG_NFS_V4 1481 INIT_LIST_HEAD(&nfsi->open_states); 1482 nfsi->delegation = NULL; 1483 nfsi->delegation_state = 0; 1484 init_rwsem(&nfsi->rwsem); 1485 nfsi->layout = NULL; 1486 atomic_set(&nfsi->commits_outstanding, 0); 1487 #endif 1488 } 1489 1490 static void init_once(void *foo) 1491 { 1492 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1493 1494 inode_init_once(&nfsi->vfs_inode); 1495 INIT_LIST_HEAD(&nfsi->open_files); 1496 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); 1497 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); 1498 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1499 nfsi->npages = 0; 1500 nfsi->ncommit = 0; 1501 atomic_set(&nfsi->silly_count, 1); 1502 INIT_HLIST_HEAD(&nfsi->silly_list); 1503 init_waitqueue_head(&nfsi->waitqueue); 1504 nfs4_init_once(nfsi); 1505 } 1506 1507 static int __init nfs_init_inodecache(void) 1508 { 1509 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1510 sizeof(struct nfs_inode), 1511 0, (SLAB_RECLAIM_ACCOUNT| 1512 SLAB_MEM_SPREAD), 1513 init_once); 1514 if (nfs_inode_cachep == NULL) 1515 return -ENOMEM; 1516 1517 return 0; 1518 } 1519 1520 static void nfs_destroy_inodecache(void) 1521 { 1522 kmem_cache_destroy(nfs_inode_cachep); 1523 } 1524 1525 struct workqueue_struct *nfsiod_workqueue; 1526 1527 /* 1528 * start up the nfsiod workqueue 1529 */ 1530 static int nfsiod_start(void) 1531 { 1532 struct workqueue_struct *wq; 1533 dprintk("RPC: creating workqueue nfsiod\n"); 1534 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); 1535 if (wq == NULL) 1536 return -ENOMEM; 1537 nfsiod_workqueue = wq; 1538 return 0; 1539 } 1540 1541 /* 1542 * Destroy the nfsiod workqueue 1543 */ 1544 static void nfsiod_stop(void) 1545 { 1546 struct workqueue_struct *wq; 1547 1548 wq = nfsiod_workqueue; 1549 if (wq == NULL) 1550 return; 1551 nfsiod_workqueue = NULL; 1552 destroy_workqueue(wq); 1553 } 1554 1555 /* 1556 * Initialize NFS 1557 */ 1558 static int __init init_nfs_fs(void) 1559 { 1560 int err; 1561 1562 err = nfs_idmap_init(); 1563 if (err < 0) 1564 goto out9; 1565 1566 err = nfs_dns_resolver_init(); 1567 if (err < 0) 1568 goto out8; 1569 1570 err = nfs_fscache_register(); 1571 if (err < 0) 1572 goto out7; 1573 1574 err = nfsiod_start(); 1575 if (err) 1576 goto out6; 1577 1578 err = nfs_fs_proc_init(); 1579 if (err) 1580 goto out5; 1581 1582 err = nfs_init_nfspagecache(); 1583 if (err) 1584 goto out4; 1585 1586 err = nfs_init_inodecache(); 1587 if (err) 1588 goto out3; 1589 1590 err = nfs_init_readpagecache(); 1591 if (err) 1592 goto out2; 1593 1594 err = nfs_init_writepagecache(); 1595 if (err) 1596 goto out1; 1597 1598 err = nfs_init_directcache(); 1599 if (err) 1600 goto out0; 1601 1602 #ifdef CONFIG_PROC_FS 1603 rpc_proc_register(&nfs_rpcstat); 1604 #endif 1605 if ((err = register_nfs_fs()) != 0) 1606 goto out; 1607 return 0; 1608 out: 1609 #ifdef CONFIG_PROC_FS 1610 rpc_proc_unregister("nfs"); 1611 #endif 1612 nfs_destroy_directcache(); 1613 out0: 1614 nfs_destroy_writepagecache(); 1615 out1: 1616 nfs_destroy_readpagecache(); 1617 out2: 1618 nfs_destroy_inodecache(); 1619 out3: 1620 nfs_destroy_nfspagecache(); 1621 out4: 1622 nfs_fs_proc_exit(); 1623 out5: 1624 nfsiod_stop(); 1625 out6: 1626 nfs_fscache_unregister(); 1627 out7: 1628 nfs_dns_resolver_destroy(); 1629 out8: 1630 nfs_idmap_quit(); 1631 out9: 1632 return err; 1633 } 1634 1635 static void __exit exit_nfs_fs(void) 1636 { 1637 nfs_destroy_directcache(); 1638 nfs_destroy_writepagecache(); 1639 nfs_destroy_readpagecache(); 1640 nfs_destroy_inodecache(); 1641 nfs_destroy_nfspagecache(); 1642 nfs_fscache_unregister(); 1643 nfs_dns_resolver_destroy(); 1644 nfs_idmap_quit(); 1645 #ifdef CONFIG_PROC_FS 1646 rpc_proc_unregister("nfs"); 1647 #endif 1648 nfs_cleanup_cb_ident_idr(); 1649 unregister_nfs_fs(); 1650 nfs_fs_proc_exit(); 1651 nfsiod_stop(); 1652 } 1653 1654 /* Not quite true; I just maintain it */ 1655 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 1656 MODULE_LICENSE("GPL"); 1657 module_param(enable_ino64, bool, 0644); 1658 1659 module_init(init_nfs_fs) 1660 module_exit(exit_nfs_fs) 1661