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