1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.114 2008/09/24 00:53:51 dillon Exp $ 35 */ 36 37 #include "hammer.h" 38 #include <vm/vm_extern.h> 39 #include <sys/buf.h> 40 #include <sys/buf2.h> 41 42 static int hammer_unload_inode(struct hammer_inode *ip); 43 static void hammer_free_inode(hammer_inode_t ip); 44 static void hammer_flush_inode_core(hammer_inode_t ip, 45 hammer_flush_group_t flg, int flags); 46 static int hammer_setup_child_callback(hammer_record_t rec, void *data); 47 #if 0 48 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data); 49 #endif 50 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 51 hammer_flush_group_t flg); 52 static int hammer_setup_parent_inodes_helper(hammer_record_t record, 53 int depth, hammer_flush_group_t flg); 54 static void hammer_inode_wakereclaims(hammer_inode_t ip, int dowake); 55 56 #ifdef DEBUG_TRUNCATE 57 extern struct hammer_inode *HammerTruncIp; 58 #endif 59 60 /* 61 * RB-Tree support for inode structures 62 */ 63 int 64 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2) 65 { 66 if (ip1->obj_localization < ip2->obj_localization) 67 return(-1); 68 if (ip1->obj_localization > ip2->obj_localization) 69 return(1); 70 if (ip1->obj_id < ip2->obj_id) 71 return(-1); 72 if (ip1->obj_id > ip2->obj_id) 73 return(1); 74 if (ip1->obj_asof < ip2->obj_asof) 75 return(-1); 76 if (ip1->obj_asof > ip2->obj_asof) 77 return(1); 78 return(0); 79 } 80 81 /* 82 * RB-Tree support for inode structures / special LOOKUP_INFO 83 */ 84 static int 85 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip) 86 { 87 if (info->obj_localization < ip->obj_localization) 88 return(-1); 89 if (info->obj_localization > ip->obj_localization) 90 return(1); 91 if (info->obj_id < ip->obj_id) 92 return(-1); 93 if (info->obj_id > ip->obj_id) 94 return(1); 95 if (info->obj_asof < ip->obj_asof) 96 return(-1); 97 if (info->obj_asof > ip->obj_asof) 98 return(1); 99 return(0); 100 } 101 102 /* 103 * Used by hammer_scan_inode_snapshots() to locate all of an object's 104 * snapshots. Note that the asof field is not tested, which we can get 105 * away with because it is the lowest-priority field. 106 */ 107 static int 108 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data) 109 { 110 hammer_inode_info_t info = data; 111 112 if (ip->obj_localization > info->obj_localization) 113 return(1); 114 if (ip->obj_localization < info->obj_localization) 115 return(-1); 116 if (ip->obj_id > info->obj_id) 117 return(1); 118 if (ip->obj_id < info->obj_id) 119 return(-1); 120 return(0); 121 } 122 123 /* 124 * Used by hammer_unload_pseudofs() to locate all inodes associated with 125 * a particular PFS. 126 */ 127 static int 128 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data) 129 { 130 u_int32_t localization = *(u_int32_t *)data; 131 if (ip->obj_localization > localization) 132 return(1); 133 if (ip->obj_localization < localization) 134 return(-1); 135 return(0); 136 } 137 138 /* 139 * RB-Tree support for pseudofs structures 140 */ 141 static int 142 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2) 143 { 144 if (p1->localization < p2->localization) 145 return(-1); 146 if (p1->localization > p2->localization) 147 return(1); 148 return(0); 149 } 150 151 152 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare); 153 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node, 154 hammer_inode_info_cmp, hammer_inode_info_t); 155 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node, 156 hammer_pfs_rb_compare, u_int32_t, localization); 157 158 /* 159 * The kernel is not actively referencing this vnode but is still holding 160 * it cached. 161 * 162 * This is called from the frontend. 163 */ 164 int 165 hammer_vop_inactive(struct vop_inactive_args *ap) 166 { 167 struct hammer_inode *ip = VTOI(ap->a_vp); 168 169 /* 170 * Degenerate case 171 */ 172 if (ip == NULL) { 173 vrecycle(ap->a_vp); 174 return(0); 175 } 176 177 /* 178 * If the inode no longer has visibility in the filesystem try to 179 * recycle it immediately, even if the inode is dirty. Recycling 180 * it quickly allows the system to reclaim buffer cache and VM 181 * resources which can matter a lot in a heavily loaded system. 182 * 183 * This can deadlock in vfsync() if we aren't careful. 184 * 185 * Do not queue the inode to the flusher if we still have visibility, 186 * otherwise namespace calls such as chmod will unnecessarily generate 187 * multiple inode updates. 188 */ 189 hammer_inode_unloadable_check(ip, 0); 190 if (ip->ino_data.nlinks == 0) { 191 if (ip->flags & HAMMER_INODE_MODMASK) 192 hammer_flush_inode(ip, 0); 193 vrecycle(ap->a_vp); 194 } 195 return(0); 196 } 197 198 /* 199 * Release the vnode association. This is typically (but not always) 200 * the last reference on the inode. 201 * 202 * Once the association is lost we are on our own with regards to 203 * flushing the inode. 204 */ 205 int 206 hammer_vop_reclaim(struct vop_reclaim_args *ap) 207 { 208 struct hammer_inode *ip; 209 hammer_mount_t hmp; 210 struct vnode *vp; 211 212 vp = ap->a_vp; 213 214 if ((ip = vp->v_data) != NULL) { 215 hmp = ip->hmp; 216 vp->v_data = NULL; 217 ip->vp = NULL; 218 219 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { 220 ++hammer_count_reclaiming; 221 ++hmp->inode_reclaims; 222 ip->flags |= HAMMER_INODE_RECLAIM; 223 } 224 hammer_rel_inode(ip, 1); 225 } 226 return(0); 227 } 228 229 /* 230 * Return a locked vnode for the specified inode. The inode must be 231 * referenced but NOT LOCKED on entry and will remain referenced on 232 * return. 233 * 234 * Called from the frontend. 235 */ 236 int 237 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) 238 { 239 hammer_mount_t hmp; 240 struct vnode *vp; 241 int error = 0; 242 u_int8_t obj_type; 243 244 hmp = ip->hmp; 245 246 for (;;) { 247 if ((vp = ip->vp) == NULL) { 248 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); 249 if (error) 250 break; 251 hammer_lock_ex(&ip->lock); 252 if (ip->vp != NULL) { 253 hammer_unlock(&ip->lock); 254 vp = *vpp; 255 vp->v_type = VBAD; 256 vx_put(vp); 257 continue; 258 } 259 hammer_ref(&ip->lock); 260 vp = *vpp; 261 ip->vp = vp; 262 263 obj_type = ip->ino_data.obj_type; 264 vp->v_type = hammer_get_vnode_type(obj_type); 265 266 hammer_inode_wakereclaims(ip, 0); 267 268 switch(ip->ino_data.obj_type) { 269 case HAMMER_OBJTYPE_CDEV: 270 case HAMMER_OBJTYPE_BDEV: 271 vp->v_ops = &hmp->mp->mnt_vn_spec_ops; 272 addaliasu(vp, ip->ino_data.rmajor, 273 ip->ino_data.rminor); 274 break; 275 case HAMMER_OBJTYPE_FIFO: 276 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops; 277 break; 278 default: 279 break; 280 } 281 282 /* 283 * Only mark as the root vnode if the ip is not 284 * historical, otherwise the VFS cache will get 285 * confused. The other half of the special handling 286 * is in hammer_vop_nlookupdotdot(). 287 * 288 * Pseudo-filesystem roots can be accessed via 289 * non-root filesystem paths and setting VROOT may 290 * confuse the namecache. Set VPFSROOT instead. 291 */ 292 if (ip->obj_id == HAMMER_OBJID_ROOT && 293 ip->obj_asof == hmp->asof) { 294 if (ip->obj_localization == 0) 295 vp->v_flag |= VROOT; 296 else 297 vp->v_flag |= VPFSROOT; 298 } 299 300 vp->v_data = (void *)ip; 301 /* vnode locked by getnewvnode() */ 302 /* make related vnode dirty if inode dirty? */ 303 hammer_unlock(&ip->lock); 304 if (vp->v_type == VREG) 305 vinitvmio(vp, ip->ino_data.size); 306 break; 307 } 308 309 /* 310 * loop if the vget fails (aka races), or if the vp 311 * no longer matches ip->vp. 312 */ 313 if (vget(vp, LK_EXCLUSIVE) == 0) { 314 if (vp == ip->vp) 315 break; 316 vput(vp); 317 } 318 } 319 *vpp = vp; 320 return(error); 321 } 322 323 /* 324 * Locate all copies of the inode for obj_id compatible with the specified 325 * asof, reference, and issue the related call-back. This routine is used 326 * for direct-io invalidation and does not create any new inodes. 327 */ 328 void 329 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo, 330 int (*callback)(hammer_inode_t ip, void *data), 331 void *data) 332 { 333 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root, 334 hammer_inode_info_cmp_all_history, 335 callback, iinfo); 336 } 337 338 /* 339 * Acquire a HAMMER inode. The returned inode is not locked. These functions 340 * do not attach or detach the related vnode (use hammer_get_vnode() for 341 * that). 342 * 343 * The flags argument is only applied for newly created inodes, and only 344 * certain flags are inherited. 345 * 346 * Called from the frontend. 347 */ 348 struct hammer_inode * 349 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, 350 int64_t obj_id, hammer_tid_t asof, u_int32_t localization, 351 int flags, int *errorp) 352 { 353 hammer_mount_t hmp = trans->hmp; 354 struct hammer_node_cache *cachep; 355 struct hammer_inode_info iinfo; 356 struct hammer_cursor cursor; 357 struct hammer_inode *ip; 358 359 360 /* 361 * Determine if we already have an inode cached. If we do then 362 * we are golden. 363 * 364 * If we find an inode with no vnode we have to mark the 365 * transaction such that hammer_inode_waitreclaims() is 366 * called later on to avoid building up an infinite number 367 * of inodes. Otherwise we can continue to * add new inodes 368 * faster then they can be disposed of, even with the tsleep 369 * delay. 370 * 371 * If we find a dummy inode we return a failure so dounlink 372 * (which does another lookup) doesn't try to mess with the 373 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode() 374 * to ref dummy inodes. 375 */ 376 iinfo.obj_id = obj_id; 377 iinfo.obj_asof = asof; 378 iinfo.obj_localization = localization; 379 loop: 380 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 381 if (ip) { 382 if (ip->flags & HAMMER_INODE_DUMMY) { 383 *errorp = ENOENT; 384 return(NULL); 385 } 386 hammer_ref(&ip->lock); 387 *errorp = 0; 388 return(ip); 389 } 390 391 /* 392 * Allocate a new inode structure and deal with races later. 393 */ 394 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 395 ++hammer_count_inodes; 396 ++hmp->count_inodes; 397 ip->obj_id = obj_id; 398 ip->obj_asof = iinfo.obj_asof; 399 ip->obj_localization = localization; 400 ip->hmp = hmp; 401 ip->flags = flags & HAMMER_INODE_RO; 402 ip->cache[0].ip = ip; 403 ip->cache[1].ip = ip; 404 ip->cache[2].ip = ip; 405 ip->cache[3].ip = ip; 406 if (hmp->ronly) 407 ip->flags |= HAMMER_INODE_RO; 408 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 409 0x7FFFFFFFFFFFFFFFLL; 410 RB_INIT(&ip->rec_tree); 411 TAILQ_INIT(&ip->target_list); 412 hammer_ref(&ip->lock); 413 414 /* 415 * Locate the on-disk inode. If this is a PFS root we always 416 * access the current version of the root inode and (if it is not 417 * a master) always access information under it with a snapshot 418 * TID. 419 * 420 * We cache recent inode lookups in this directory in dip->cache[2]. 421 * If we can't find it we assume the inode we are looking for is 422 * close to the directory inode. 423 */ 424 retry: 425 cachep = NULL; 426 if (dip) { 427 if (dip->cache[2].node) 428 cachep = &dip->cache[2]; 429 else 430 cachep = &dip->cache[0]; 431 } 432 hammer_init_cursor(trans, &cursor, cachep, NULL); 433 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE; 434 cursor.key_beg.obj_id = ip->obj_id; 435 cursor.key_beg.key = 0; 436 cursor.key_beg.create_tid = 0; 437 cursor.key_beg.delete_tid = 0; 438 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 439 cursor.key_beg.obj_type = 0; 440 441 cursor.asof = iinfo.obj_asof; 442 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 443 HAMMER_CURSOR_ASOF; 444 445 *errorp = hammer_btree_lookup(&cursor); 446 if (*errorp == EDEADLK) { 447 hammer_done_cursor(&cursor); 448 goto retry; 449 } 450 451 /* 452 * On success the B-Tree lookup will hold the appropriate 453 * buffer cache buffers and provide a pointer to the requested 454 * information. Copy the information to the in-memory inode 455 * and cache the B-Tree node to improve future operations. 456 */ 457 if (*errorp == 0) { 458 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 459 ip->ino_data = cursor.data->inode; 460 461 /* 462 * cache[0] tries to cache the location of the object inode. 463 * The assumption is that it is near the directory inode. 464 * 465 * cache[1] tries to cache the location of the object data. 466 * We might have something in the governing directory from 467 * scan optimizations (see the strategy code in 468 * hammer_vnops.c). 469 * 470 * We update dip->cache[2], if possible, with the location 471 * of the object inode for future directory shortcuts. 472 */ 473 hammer_cache_node(&ip->cache[0], cursor.node); 474 if (dip) { 475 if (dip->cache[3].node) { 476 hammer_cache_node(&ip->cache[1], 477 dip->cache[3].node); 478 } 479 hammer_cache_node(&dip->cache[2], cursor.node); 480 } 481 482 /* 483 * The file should not contain any data past the file size 484 * stored in the inode. Setting save_trunc_off to the 485 * file size instead of max reduces B-Tree lookup overheads 486 * on append by allowing the flusher to avoid checking for 487 * record overwrites. 488 */ 489 ip->save_trunc_off = ip->ino_data.size; 490 491 /* 492 * Locate and assign the pseudofs management structure to 493 * the inode. 494 */ 495 if (dip && dip->obj_localization == ip->obj_localization) { 496 ip->pfsm = dip->pfsm; 497 hammer_ref(&ip->pfsm->lock); 498 } else { 499 ip->pfsm = hammer_load_pseudofs(trans, 500 ip->obj_localization, 501 errorp); 502 *errorp = 0; /* ignore ENOENT */ 503 } 504 } 505 506 /* 507 * The inode is placed on the red-black tree and will be synced to 508 * the media when flushed or by the filesystem sync. If this races 509 * another instantiation/lookup the insertion will fail. 510 */ 511 if (*errorp == 0) { 512 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 513 hammer_free_inode(ip); 514 hammer_done_cursor(&cursor); 515 goto loop; 516 } 517 ip->flags |= HAMMER_INODE_ONDISK; 518 } else { 519 if (ip->flags & HAMMER_INODE_RSV_INODES) { 520 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 521 --hmp->rsv_inodes; 522 } 523 524 hammer_free_inode(ip); 525 ip = NULL; 526 } 527 hammer_done_cursor(&cursor); 528 trans->flags |= HAMMER_TRANSF_NEWINODE; 529 return (ip); 530 } 531 532 /* 533 * Get a dummy inode to placemark a broken directory entry. 534 */ 535 struct hammer_inode * 536 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip, 537 int64_t obj_id, hammer_tid_t asof, u_int32_t localization, 538 int flags, int *errorp) 539 { 540 hammer_mount_t hmp = trans->hmp; 541 struct hammer_inode_info iinfo; 542 struct hammer_inode *ip; 543 544 /* 545 * Determine if we already have an inode cached. If we do then 546 * we are golden. 547 * 548 * If we find an inode with no vnode we have to mark the 549 * transaction such that hammer_inode_waitreclaims() is 550 * called later on to avoid building up an infinite number 551 * of inodes. Otherwise we can continue to * add new inodes 552 * faster then they can be disposed of, even with the tsleep 553 * delay. 554 * 555 * If we find a non-fake inode we return an error. Only fake 556 * inodes can be returned by this routine. 557 */ 558 iinfo.obj_id = obj_id; 559 iinfo.obj_asof = asof; 560 iinfo.obj_localization = localization; 561 loop: 562 *errorp = 0; 563 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 564 if (ip) { 565 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) { 566 *errorp = ENOENT; 567 return(NULL); 568 } 569 hammer_ref(&ip->lock); 570 return(ip); 571 } 572 573 /* 574 * Allocate a new inode structure and deal with races later. 575 */ 576 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 577 ++hammer_count_inodes; 578 ++hmp->count_inodes; 579 ip->obj_id = obj_id; 580 ip->obj_asof = iinfo.obj_asof; 581 ip->obj_localization = localization; 582 ip->hmp = hmp; 583 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY; 584 ip->cache[0].ip = ip; 585 ip->cache[1].ip = ip; 586 ip->cache[2].ip = ip; 587 ip->cache[3].ip = ip; 588 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 589 0x7FFFFFFFFFFFFFFFLL; 590 RB_INIT(&ip->rec_tree); 591 TAILQ_INIT(&ip->target_list); 592 hammer_ref(&ip->lock); 593 594 /* 595 * Populate the dummy inode. Leave everything zero'd out. 596 * 597 * (ip->ino_leaf and ip->ino_data) 598 * 599 * Make the dummy inode a FIFO object which most copy programs 600 * will properly ignore. 601 */ 602 ip->save_trunc_off = ip->ino_data.size; 603 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO; 604 605 /* 606 * Locate and assign the pseudofs management structure to 607 * the inode. 608 */ 609 if (dip && dip->obj_localization == ip->obj_localization) { 610 ip->pfsm = dip->pfsm; 611 hammer_ref(&ip->pfsm->lock); 612 } else { 613 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization, 614 errorp); 615 *errorp = 0; /* ignore ENOENT */ 616 } 617 618 /* 619 * The inode is placed on the red-black tree and will be synced to 620 * the media when flushed or by the filesystem sync. If this races 621 * another instantiation/lookup the insertion will fail. 622 * 623 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake. 624 */ 625 if (*errorp == 0) { 626 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 627 hammer_free_inode(ip); 628 goto loop; 629 } 630 } else { 631 if (ip->flags & HAMMER_INODE_RSV_INODES) { 632 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 633 --hmp->rsv_inodes; 634 } 635 hammer_free_inode(ip); 636 ip = NULL; 637 } 638 trans->flags |= HAMMER_TRANSF_NEWINODE; 639 return (ip); 640 } 641 642 /* 643 * Return a referenced inode only if it is in our inode cache. 644 * 645 * Dummy inodes do not count. 646 */ 647 struct hammer_inode * 648 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 649 hammer_tid_t asof, u_int32_t localization) 650 { 651 hammer_mount_t hmp = trans->hmp; 652 struct hammer_inode_info iinfo; 653 struct hammer_inode *ip; 654 655 iinfo.obj_id = obj_id; 656 iinfo.obj_asof = asof; 657 iinfo.obj_localization = localization; 658 659 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 660 if (ip) { 661 if (ip->flags & HAMMER_INODE_DUMMY) 662 ip = NULL; 663 else 664 hammer_ref(&ip->lock); 665 } 666 return(ip); 667 } 668 669 /* 670 * Create a new filesystem object, returning the inode in *ipp. The 671 * returned inode will be referenced. The inode is created in-memory. 672 * 673 * If pfsm is non-NULL the caller wishes to create the root inode for 674 * a master PFS. 675 */ 676 int 677 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 678 struct ucred *cred, 679 hammer_inode_t dip, const char *name, int namelen, 680 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 681 { 682 hammer_mount_t hmp; 683 hammer_inode_t ip; 684 uid_t xuid; 685 int error; 686 int64_t namekey; 687 u_int32_t dummy; 688 689 hmp = trans->hmp; 690 691 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 692 ++hammer_count_inodes; 693 ++hmp->count_inodes; 694 trans->flags |= HAMMER_TRANSF_NEWINODE; 695 696 if (pfsm) { 697 KKASSERT(pfsm->localization != 0); 698 ip->obj_id = HAMMER_OBJID_ROOT; 699 ip->obj_localization = pfsm->localization; 700 } else { 701 KKASSERT(dip != NULL); 702 namekey = hammer_directory_namekey(dip, name, namelen, &dummy); 703 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey); 704 ip->obj_localization = dip->obj_localization; 705 } 706 707 KKASSERT(ip->obj_id != 0); 708 ip->obj_asof = hmp->asof; 709 ip->hmp = hmp; 710 ip->flush_state = HAMMER_FST_IDLE; 711 ip->flags = HAMMER_INODE_DDIRTY | 712 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 713 ip->cache[0].ip = ip; 714 ip->cache[1].ip = ip; 715 ip->cache[2].ip = ip; 716 ip->cache[3].ip = ip; 717 718 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 719 /* ip->save_trunc_off = 0; (already zero) */ 720 RB_INIT(&ip->rec_tree); 721 TAILQ_INIT(&ip->target_list); 722 723 ip->ino_data.atime = trans->time; 724 ip->ino_data.mtime = trans->time; 725 ip->ino_data.size = 0; 726 ip->ino_data.nlinks = 0; 727 728 /* 729 * A nohistory designator on the parent directory is inherited by 730 * the child. We will do this even for pseudo-fs creation... the 731 * sysad can turn it off. 732 */ 733 if (dip) { 734 ip->ino_data.uflags = dip->ino_data.uflags & 735 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 736 } 737 738 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 739 ip->ino_leaf.base.localization = ip->obj_localization + 740 HAMMER_LOCALIZE_INODE; 741 ip->ino_leaf.base.obj_id = ip->obj_id; 742 ip->ino_leaf.base.key = 0; 743 ip->ino_leaf.base.create_tid = 0; 744 ip->ino_leaf.base.delete_tid = 0; 745 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 746 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 747 748 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 749 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 750 ip->ino_data.mode = vap->va_mode; 751 ip->ino_data.ctime = trans->time; 752 753 /* 754 * If we are running version 2 or greater directory entries are 755 * inode-localized instead of data-localized. 756 */ 757 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 758 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 759 ip->ino_data.cap_flags |= 760 HAMMER_INODE_CAP_DIR_LOCAL_INO; 761 } 762 } 763 764 /* 765 * Setup the ".." pointer. This only needs to be done for directories 766 * but we do it for all objects as a recovery aid. 767 */ 768 if (dip) 769 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 770 #if 0 771 /* 772 * The parent_obj_localization field only applies to pseudo-fs roots. 773 * XXX this is no longer applicable, PFSs are no longer directly 774 * tied into the parent's directory structure. 775 */ 776 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY && 777 ip->obj_id == HAMMER_OBJID_ROOT) { 778 ip->ino_data.ext.obj.parent_obj_localization = 779 dip->obj_localization; 780 } 781 #endif 782 783 switch(ip->ino_leaf.base.obj_type) { 784 case HAMMER_OBJTYPE_CDEV: 785 case HAMMER_OBJTYPE_BDEV: 786 ip->ino_data.rmajor = vap->va_rmajor; 787 ip->ino_data.rminor = vap->va_rminor; 788 break; 789 default: 790 break; 791 } 792 793 /* 794 * Calculate default uid/gid and overwrite with information from 795 * the vap. 796 */ 797 if (dip) { 798 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 799 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 800 xuid, cred, &vap->va_mode); 801 } else { 802 xuid = 0; 803 } 804 ip->ino_data.mode = vap->va_mode; 805 806 if (vap->va_vaflags & VA_UID_UUID_VALID) 807 ip->ino_data.uid = vap->va_uid_uuid; 808 else if (vap->va_uid != (uid_t)VNOVAL) 809 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 810 else 811 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 812 813 if (vap->va_vaflags & VA_GID_UUID_VALID) 814 ip->ino_data.gid = vap->va_gid_uuid; 815 else if (vap->va_gid != (gid_t)VNOVAL) 816 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 817 else if (dip) 818 ip->ino_data.gid = dip->ino_data.gid; 819 820 hammer_ref(&ip->lock); 821 822 if (pfsm) { 823 ip->pfsm = pfsm; 824 hammer_ref(&pfsm->lock); 825 error = 0; 826 } else if (dip->obj_localization == ip->obj_localization) { 827 ip->pfsm = dip->pfsm; 828 hammer_ref(&ip->pfsm->lock); 829 error = 0; 830 } else { 831 ip->pfsm = hammer_load_pseudofs(trans, 832 ip->obj_localization, 833 &error); 834 error = 0; /* ignore ENOENT */ 835 } 836 837 if (error) { 838 hammer_free_inode(ip); 839 ip = NULL; 840 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 841 panic("hammer_create_inode: duplicate obj_id %llx", 842 (long long)ip->obj_id); 843 /* not reached */ 844 hammer_free_inode(ip); 845 } 846 *ipp = ip; 847 return(error); 848 } 849 850 /* 851 * Final cleanup / freeing of an inode structure 852 */ 853 static void 854 hammer_free_inode(hammer_inode_t ip) 855 { 856 struct hammer_mount *hmp; 857 858 hmp = ip->hmp; 859 KKASSERT(ip->lock.refs == 1); 860 hammer_uncache_node(&ip->cache[0]); 861 hammer_uncache_node(&ip->cache[1]); 862 hammer_uncache_node(&ip->cache[2]); 863 hammer_uncache_node(&ip->cache[3]); 864 hammer_inode_wakereclaims(ip, 1); 865 if (ip->objid_cache) 866 hammer_clear_objid(ip); 867 --hammer_count_inodes; 868 --hmp->count_inodes; 869 if (ip->pfsm) { 870 hammer_rel_pseudofs(hmp, ip->pfsm); 871 ip->pfsm = NULL; 872 } 873 kfree(ip, hmp->m_inodes); 874 ip = NULL; 875 } 876 877 /* 878 * Retrieve pseudo-fs data. NULL will never be returned. 879 * 880 * If an error occurs *errorp will be set and a default template is returned, 881 * otherwise *errorp is set to 0. Typically when an error occurs it will 882 * be ENOENT. 883 */ 884 hammer_pseudofs_inmem_t 885 hammer_load_pseudofs(hammer_transaction_t trans, 886 u_int32_t localization, int *errorp) 887 { 888 hammer_mount_t hmp = trans->hmp; 889 hammer_inode_t ip; 890 hammer_pseudofs_inmem_t pfsm; 891 struct hammer_cursor cursor; 892 int bytes; 893 894 retry: 895 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 896 if (pfsm) { 897 hammer_ref(&pfsm->lock); 898 *errorp = 0; 899 return(pfsm); 900 } 901 902 /* 903 * PFS records are stored in the root inode (not the PFS root inode, 904 * but the real root). Avoid an infinite recursion if loading 905 * the PFS for the real root. 906 */ 907 if (localization) { 908 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 909 HAMMER_MAX_TID, 910 HAMMER_DEF_LOCALIZATION, 0, errorp); 911 } else { 912 ip = NULL; 913 } 914 915 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 916 pfsm->localization = localization; 917 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 918 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 919 920 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 921 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION + 922 HAMMER_LOCALIZE_MISC; 923 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 924 cursor.key_beg.create_tid = 0; 925 cursor.key_beg.delete_tid = 0; 926 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 927 cursor.key_beg.obj_type = 0; 928 cursor.key_beg.key = localization; 929 cursor.asof = HAMMER_MAX_TID; 930 cursor.flags |= HAMMER_CURSOR_ASOF; 931 932 if (ip) 933 *errorp = hammer_ip_lookup(&cursor); 934 else 935 *errorp = hammer_btree_lookup(&cursor); 936 if (*errorp == 0) { 937 *errorp = hammer_ip_resolve_data(&cursor); 938 if (*errorp == 0) { 939 if (cursor.data->pfsd.mirror_flags & 940 HAMMER_PFSD_DELETED) { 941 *errorp = ENOENT; 942 } else { 943 bytes = cursor.leaf->data_len; 944 if (bytes > sizeof(pfsm->pfsd)) 945 bytes = sizeof(pfsm->pfsd); 946 bcopy(cursor.data, &pfsm->pfsd, bytes); 947 } 948 } 949 } 950 hammer_done_cursor(&cursor); 951 952 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 953 hammer_ref(&pfsm->lock); 954 if (ip) 955 hammer_rel_inode(ip, 0); 956 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 957 kfree(pfsm, hmp->m_misc); 958 goto retry; 959 } 960 return(pfsm); 961 } 962 963 /* 964 * Store pseudo-fs data. The backend will automatically delete any prior 965 * on-disk pseudo-fs data but we have to delete in-memory versions. 966 */ 967 int 968 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 969 { 970 struct hammer_cursor cursor; 971 hammer_record_t record; 972 hammer_inode_t ip; 973 int error; 974 975 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 976 HAMMER_DEF_LOCALIZATION, 0, &error); 977 retry: 978 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 979 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 980 cursor.key_beg.localization = ip->obj_localization + 981 HAMMER_LOCALIZE_MISC; 982 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 983 cursor.key_beg.create_tid = 0; 984 cursor.key_beg.delete_tid = 0; 985 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 986 cursor.key_beg.obj_type = 0; 987 cursor.key_beg.key = pfsm->localization; 988 cursor.asof = HAMMER_MAX_TID; 989 cursor.flags |= HAMMER_CURSOR_ASOF; 990 991 /* 992 * Replace any in-memory version of the record. 993 */ 994 error = hammer_ip_lookup(&cursor); 995 if (error == 0 && hammer_cursor_inmem(&cursor)) { 996 record = cursor.iprec; 997 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 998 KKASSERT(cursor.deadlk_rec == NULL); 999 hammer_ref(&record->lock); 1000 cursor.deadlk_rec = record; 1001 error = EDEADLK; 1002 } else { 1003 record->flags |= HAMMER_RECF_DELETED_FE; 1004 error = 0; 1005 } 1006 } 1007 1008 /* 1009 * Allocate replacement general record. The backend flush will 1010 * delete any on-disk version of the record. 1011 */ 1012 if (error == 0 || error == ENOENT) { 1013 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 1014 record->type = HAMMER_MEM_RECORD_GENERAL; 1015 1016 record->leaf.base.localization = ip->obj_localization + 1017 HAMMER_LOCALIZE_MISC; 1018 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 1019 record->leaf.base.key = pfsm->localization; 1020 record->leaf.data_len = sizeof(pfsm->pfsd); 1021 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 1022 error = hammer_ip_add_record(trans, record); 1023 } 1024 hammer_done_cursor(&cursor); 1025 if (error == EDEADLK) 1026 goto retry; 1027 hammer_rel_inode(ip, 0); 1028 return(error); 1029 } 1030 1031 /* 1032 * Create a root directory for a PFS if one does not alredy exist. 1033 * 1034 * The PFS root stands alone so we must also bump the nlinks count 1035 * to prevent it from being destroyed on release. 1036 */ 1037 int 1038 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 1039 hammer_pseudofs_inmem_t pfsm) 1040 { 1041 hammer_inode_t ip; 1042 struct vattr vap; 1043 int error; 1044 1045 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1046 pfsm->localization, 0, &error); 1047 if (ip == NULL) { 1048 vattr_null(&vap); 1049 vap.va_mode = 0755; 1050 vap.va_type = VDIR; 1051 error = hammer_create_inode(trans, &vap, cred, 1052 NULL, NULL, 0, 1053 pfsm, &ip); 1054 if (error == 0) { 1055 ++ip->ino_data.nlinks; 1056 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY); 1057 } 1058 } 1059 if (ip) 1060 hammer_rel_inode(ip, 0); 1061 return(error); 1062 } 1063 1064 /* 1065 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 1066 * if we are unable to disassociate all the inodes. 1067 */ 1068 static 1069 int 1070 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 1071 { 1072 int res; 1073 1074 hammer_ref(&ip->lock); 1075 if (ip->lock.refs == 2 && ip->vp) 1076 vclean_unlocked(ip->vp); 1077 if (ip->lock.refs == 1 && ip->vp == NULL) 1078 res = 0; 1079 else 1080 res = -1; /* stop, someone is using the inode */ 1081 hammer_rel_inode(ip, 0); 1082 return(res); 1083 } 1084 1085 int 1086 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization) 1087 { 1088 int res; 1089 int try; 1090 1091 for (try = res = 0; try < 4; ++try) { 1092 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 1093 hammer_inode_pfs_cmp, 1094 hammer_unload_pseudofs_callback, 1095 &localization); 1096 if (res == 0 && try > 1) 1097 break; 1098 hammer_flusher_sync(trans->hmp); 1099 } 1100 if (res != 0) 1101 res = ENOTEMPTY; 1102 return(res); 1103 } 1104 1105 1106 /* 1107 * Release a reference on a PFS 1108 */ 1109 void 1110 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 1111 { 1112 hammer_unref(&pfsm->lock); 1113 if (pfsm->lock.refs == 0) { 1114 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 1115 kfree(pfsm, hmp->m_misc); 1116 } 1117 } 1118 1119 /* 1120 * Called by hammer_sync_inode(). 1121 */ 1122 static int 1123 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 1124 { 1125 hammer_transaction_t trans = cursor->trans; 1126 hammer_record_t record; 1127 int error; 1128 int redirty; 1129 1130 retry: 1131 error = 0; 1132 1133 /* 1134 * If the inode has a presence on-disk then locate it and mark 1135 * it deleted, setting DELONDISK. 1136 * 1137 * The record may or may not be physically deleted, depending on 1138 * the retention policy. 1139 */ 1140 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 1141 HAMMER_INODE_ONDISK) { 1142 hammer_normalize_cursor(cursor); 1143 cursor->key_beg.localization = ip->obj_localization + 1144 HAMMER_LOCALIZE_INODE; 1145 cursor->key_beg.obj_id = ip->obj_id; 1146 cursor->key_beg.key = 0; 1147 cursor->key_beg.create_tid = 0; 1148 cursor->key_beg.delete_tid = 0; 1149 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1150 cursor->key_beg.obj_type = 0; 1151 cursor->asof = ip->obj_asof; 1152 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1153 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 1154 cursor->flags |= HAMMER_CURSOR_BACKEND; 1155 1156 error = hammer_btree_lookup(cursor); 1157 if (hammer_debug_inode) 1158 kprintf("IPDEL %p %08x %d", ip, ip->flags, error); 1159 1160 if (error == 0) { 1161 error = hammer_ip_delete_record(cursor, ip, trans->tid); 1162 if (hammer_debug_inode) 1163 kprintf(" error %d\n", error); 1164 if (error == 0) { 1165 ip->flags |= HAMMER_INODE_DELONDISK; 1166 } 1167 if (cursor->node) 1168 hammer_cache_node(&ip->cache[0], cursor->node); 1169 } 1170 if (error == EDEADLK) { 1171 hammer_done_cursor(cursor); 1172 error = hammer_init_cursor(trans, cursor, 1173 &ip->cache[0], ip); 1174 if (hammer_debug_inode) 1175 kprintf("IPDED %p %d\n", ip, error); 1176 if (error == 0) 1177 goto retry; 1178 } 1179 } 1180 1181 /* 1182 * Ok, write out the initial record or a new record (after deleting 1183 * the old one), unless the DELETED flag is set. This routine will 1184 * clear DELONDISK if it writes out a record. 1185 * 1186 * Update our inode statistics if this is the first application of 1187 * the inode on-disk. 1188 */ 1189 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 1190 /* 1191 * Generate a record and write it to the media. We clean-up 1192 * the state before releasing so we do not have to set-up 1193 * a flush_group. 1194 */ 1195 record = hammer_alloc_mem_record(ip, 0); 1196 record->type = HAMMER_MEM_RECORD_INODE; 1197 record->flush_state = HAMMER_FST_FLUSH; 1198 record->leaf = ip->sync_ino_leaf; 1199 record->leaf.base.create_tid = trans->tid; 1200 record->leaf.data_len = sizeof(ip->sync_ino_data); 1201 record->leaf.create_ts = trans->time32; 1202 record->data = (void *)&ip->sync_ino_data; 1203 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1204 1205 /* 1206 * If this flag is set we cannot sync the new file size 1207 * because we haven't finished related truncations. The 1208 * inode will be flushed in another flush group to finish 1209 * the job. 1210 */ 1211 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1212 ip->sync_ino_data.size != ip->ino_data.size) { 1213 redirty = 1; 1214 ip->sync_ino_data.size = ip->ino_data.size; 1215 } else { 1216 redirty = 0; 1217 } 1218 1219 for (;;) { 1220 error = hammer_ip_sync_record_cursor(cursor, record); 1221 if (hammer_debug_inode) 1222 kprintf("GENREC %p rec %08x %d\n", 1223 ip, record->flags, error); 1224 if (error != EDEADLK) 1225 break; 1226 hammer_done_cursor(cursor); 1227 error = hammer_init_cursor(trans, cursor, 1228 &ip->cache[0], ip); 1229 if (hammer_debug_inode) 1230 kprintf("GENREC reinit %d\n", error); 1231 if (error) 1232 break; 1233 } 1234 1235 /* 1236 * Note: The record was never on the inode's record tree 1237 * so just wave our hands importantly and destroy it. 1238 */ 1239 record->flags |= HAMMER_RECF_COMMITTED; 1240 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1241 record->flush_state = HAMMER_FST_IDLE; 1242 ++ip->rec_generation; 1243 hammer_rel_mem_record(record); 1244 1245 /* 1246 * Finish up. 1247 */ 1248 if (error == 0) { 1249 if (hammer_debug_inode) 1250 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1251 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1252 HAMMER_INODE_ATIME | 1253 HAMMER_INODE_MTIME); 1254 ip->flags &= ~HAMMER_INODE_DELONDISK; 1255 if (redirty) 1256 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1257 1258 /* 1259 * Root volume count of inodes 1260 */ 1261 hammer_sync_lock_sh(trans); 1262 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1263 hammer_modify_volume_field(trans, 1264 trans->rootvol, 1265 vol0_stat_inodes); 1266 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1267 hammer_modify_volume_done(trans->rootvol); 1268 ip->flags |= HAMMER_INODE_ONDISK; 1269 if (hammer_debug_inode) 1270 kprintf("NOWONDISK %p\n", ip); 1271 } 1272 hammer_sync_unlock(trans); 1273 } 1274 } 1275 1276 /* 1277 * If the inode has been destroyed, clean out any left-over flags 1278 * that may have been set by the frontend. 1279 */ 1280 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1281 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1282 HAMMER_INODE_ATIME | 1283 HAMMER_INODE_MTIME); 1284 } 1285 return(error); 1286 } 1287 1288 /* 1289 * Update only the itimes fields. 1290 * 1291 * ATIME can be updated without generating any UNDO. MTIME is updated 1292 * with UNDO so it is guaranteed to be synchronized properly in case of 1293 * a crash. 1294 * 1295 * Neither field is included in the B-Tree leaf element's CRC, which is how 1296 * we can get away with updating ATIME the way we do. 1297 */ 1298 static int 1299 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1300 { 1301 hammer_transaction_t trans = cursor->trans; 1302 int error; 1303 1304 retry: 1305 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1306 HAMMER_INODE_ONDISK) { 1307 return(0); 1308 } 1309 1310 hammer_normalize_cursor(cursor); 1311 cursor->key_beg.localization = ip->obj_localization + 1312 HAMMER_LOCALIZE_INODE; 1313 cursor->key_beg.obj_id = ip->obj_id; 1314 cursor->key_beg.key = 0; 1315 cursor->key_beg.create_tid = 0; 1316 cursor->key_beg.delete_tid = 0; 1317 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1318 cursor->key_beg.obj_type = 0; 1319 cursor->asof = ip->obj_asof; 1320 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1321 cursor->flags |= HAMMER_CURSOR_ASOF; 1322 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1323 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1324 cursor->flags |= HAMMER_CURSOR_BACKEND; 1325 1326 error = hammer_btree_lookup(cursor); 1327 if (error == 0) { 1328 hammer_cache_node(&ip->cache[0], cursor->node); 1329 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1330 /* 1331 * Updating MTIME requires an UNDO. Just cover 1332 * both atime and mtime. 1333 */ 1334 hammer_sync_lock_sh(trans); 1335 hammer_modify_buffer(trans, cursor->data_buffer, 1336 HAMMER_ITIMES_BASE(&cursor->data->inode), 1337 HAMMER_ITIMES_BYTES); 1338 cursor->data->inode.atime = ip->sync_ino_data.atime; 1339 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1340 hammer_modify_buffer_done(cursor->data_buffer); 1341 hammer_sync_unlock(trans); 1342 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1343 /* 1344 * Updating atime only can be done in-place with 1345 * no UNDO. 1346 */ 1347 hammer_sync_lock_sh(trans); 1348 hammer_modify_buffer(trans, cursor->data_buffer, 1349 NULL, 0); 1350 cursor->data->inode.atime = ip->sync_ino_data.atime; 1351 hammer_modify_buffer_done(cursor->data_buffer); 1352 hammer_sync_unlock(trans); 1353 } 1354 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1355 } 1356 if (error == EDEADLK) { 1357 hammer_done_cursor(cursor); 1358 error = hammer_init_cursor(trans, cursor, 1359 &ip->cache[0], ip); 1360 if (error == 0) 1361 goto retry; 1362 } 1363 return(error); 1364 } 1365 1366 /* 1367 * Release a reference on an inode, flush as requested. 1368 * 1369 * On the last reference we queue the inode to the flusher for its final 1370 * disposition. 1371 */ 1372 void 1373 hammer_rel_inode(struct hammer_inode *ip, int flush) 1374 { 1375 /*hammer_mount_t hmp = ip->hmp;*/ 1376 1377 /* 1378 * Handle disposition when dropping the last ref. 1379 */ 1380 for (;;) { 1381 if (ip->lock.refs == 1) { 1382 /* 1383 * Determine whether on-disk action is needed for 1384 * the inode's final disposition. 1385 */ 1386 KKASSERT(ip->vp == NULL); 1387 hammer_inode_unloadable_check(ip, 0); 1388 if (ip->flags & HAMMER_INODE_MODMASK) { 1389 hammer_flush_inode(ip, 0); 1390 } else if (ip->lock.refs == 1) { 1391 hammer_unload_inode(ip); 1392 break; 1393 } 1394 } else { 1395 if (flush) 1396 hammer_flush_inode(ip, 0); 1397 1398 /* 1399 * The inode still has multiple refs, try to drop 1400 * one ref. 1401 */ 1402 KKASSERT(ip->lock.refs >= 1); 1403 if (ip->lock.refs > 1) { 1404 hammer_unref(&ip->lock); 1405 break; 1406 } 1407 } 1408 } 1409 } 1410 1411 /* 1412 * Unload and destroy the specified inode. Must be called with one remaining 1413 * reference. The reference is disposed of. 1414 * 1415 * The inode must be completely clean. 1416 */ 1417 static int 1418 hammer_unload_inode(struct hammer_inode *ip) 1419 { 1420 hammer_mount_t hmp = ip->hmp; 1421 1422 KASSERT(ip->lock.refs == 1, 1423 ("hammer_unload_inode: %d refs\n", ip->lock.refs)); 1424 KKASSERT(ip->vp == NULL); 1425 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1426 KKASSERT(ip->cursor_ip_refs == 0); 1427 KKASSERT(ip->lock.lockcount == 0); 1428 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1429 1430 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1431 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1432 1433 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1434 1435 hammer_free_inode(ip); 1436 return(0); 1437 } 1438 1439 /* 1440 * Called during unmounting if a critical error occured. The in-memory 1441 * inode and all related structures are destroyed. 1442 * 1443 * If a critical error did not occur the unmount code calls the standard 1444 * release and asserts that the inode is gone. 1445 */ 1446 int 1447 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1448 { 1449 hammer_record_t rec; 1450 1451 /* 1452 * Get rid of the inodes in-memory records, regardless of their 1453 * state, and clear the mod-mask. 1454 */ 1455 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1456 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1457 rec->target_ip = NULL; 1458 if (rec->flush_state == HAMMER_FST_SETUP) 1459 rec->flush_state = HAMMER_FST_IDLE; 1460 } 1461 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1462 if (rec->flush_state == HAMMER_FST_FLUSH) 1463 --rec->flush_group->refs; 1464 else 1465 hammer_ref(&rec->lock); 1466 KKASSERT(rec->lock.refs == 1); 1467 rec->flush_state = HAMMER_FST_IDLE; 1468 rec->flush_group = NULL; 1469 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */ 1470 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */ 1471 ++ip->rec_generation; 1472 hammer_rel_mem_record(rec); 1473 } 1474 ip->flags &= ~HAMMER_INODE_MODMASK; 1475 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1476 KKASSERT(ip->vp == NULL); 1477 1478 /* 1479 * Remove the inode from any flush group, force it idle. FLUSH 1480 * and SETUP states have an inode ref. 1481 */ 1482 switch(ip->flush_state) { 1483 case HAMMER_FST_FLUSH: 1484 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 1485 --ip->flush_group->refs; 1486 ip->flush_group = NULL; 1487 /* fall through */ 1488 case HAMMER_FST_SETUP: 1489 hammer_unref(&ip->lock); 1490 ip->flush_state = HAMMER_FST_IDLE; 1491 /* fall through */ 1492 case HAMMER_FST_IDLE: 1493 break; 1494 } 1495 1496 /* 1497 * There shouldn't be any associated vnode. The unload needs at 1498 * least one ref, if we do have a vp steal its ip ref. 1499 */ 1500 if (ip->vp) { 1501 kprintf("hammer_destroy_inode_callback: Unexpected " 1502 "vnode association ip %p vp %p\n", ip, ip->vp); 1503 ip->vp->v_data = NULL; 1504 ip->vp = NULL; 1505 } else { 1506 hammer_ref(&ip->lock); 1507 } 1508 hammer_unload_inode(ip); 1509 return(0); 1510 } 1511 1512 /* 1513 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1514 * the read-only flag for cached inodes. 1515 * 1516 * This routine is called from a RB_SCAN(). 1517 */ 1518 int 1519 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1520 { 1521 hammer_mount_t hmp = ip->hmp; 1522 1523 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1524 ip->flags |= HAMMER_INODE_RO; 1525 else 1526 ip->flags &= ~HAMMER_INODE_RO; 1527 return(0); 1528 } 1529 1530 /* 1531 * A transaction has modified an inode, requiring updates as specified by 1532 * the passed flags. 1533 * 1534 * HAMMER_INODE_DDIRTY: Inode data has been updated 1535 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1536 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1537 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1538 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1539 */ 1540 void 1541 hammer_modify_inode(hammer_inode_t ip, int flags) 1542 { 1543 /* 1544 * ronly of 0 or 2 does not trigger assertion. 1545 * 2 is a special error state 1546 */ 1547 KKASSERT(ip->hmp->ronly != 1 || 1548 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1549 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1550 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1551 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1552 ip->flags |= HAMMER_INODE_RSV_INODES; 1553 ++ip->hmp->rsv_inodes; 1554 } 1555 1556 ip->flags |= flags; 1557 } 1558 1559 /* 1560 * Request that an inode be flushed. This whole mess cannot block and may 1561 * recurse (if not synchronous). Once requested HAMMER will attempt to 1562 * actively flush the inode until the flush can be done. 1563 * 1564 * The inode may already be flushing, or may be in a setup state. We can 1565 * place the inode in a flushing state if it is currently idle and flag it 1566 * to reflush if it is currently flushing. 1567 * 1568 * Upon return if the inode could not be flushed due to a setup 1569 * dependancy, then it will be automatically flushed when the dependancy 1570 * is satisfied. 1571 */ 1572 void 1573 hammer_flush_inode(hammer_inode_t ip, int flags) 1574 { 1575 hammer_mount_t hmp; 1576 hammer_flush_group_t flg; 1577 int good; 1578 1579 /* 1580 * next_flush_group is the first flush group we can place the inode 1581 * in. It may be NULL. If it becomes full we append a new flush 1582 * group and make that the next_flush_group. 1583 */ 1584 hmp = ip->hmp; 1585 while ((flg = hmp->next_flush_group) != NULL) { 1586 KKASSERT(flg->running == 0); 1587 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit) 1588 break; 1589 hmp->next_flush_group = TAILQ_NEXT(flg, flush_entry); 1590 hammer_flusher_async(ip->hmp, flg); 1591 } 1592 if (flg == NULL) { 1593 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1594 hmp->next_flush_group = flg; 1595 TAILQ_INIT(&flg->flush_list); 1596 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1597 } 1598 1599 /* 1600 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1601 * state we have to put it back into an IDLE state so we can 1602 * drop the extra ref. 1603 * 1604 * If we have a parent dependancy we must still fall through 1605 * so we can run it. 1606 */ 1607 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1608 if (ip->flush_state == HAMMER_FST_SETUP && 1609 TAILQ_EMPTY(&ip->target_list)) { 1610 ip->flush_state = HAMMER_FST_IDLE; 1611 hammer_rel_inode(ip, 0); 1612 } 1613 if (ip->flush_state == HAMMER_FST_IDLE) 1614 return; 1615 } 1616 1617 /* 1618 * Our flush action will depend on the current state. 1619 */ 1620 switch(ip->flush_state) { 1621 case HAMMER_FST_IDLE: 1622 /* 1623 * We have no dependancies and can flush immediately. Some 1624 * our children may not be flushable so we have to re-test 1625 * with that additional knowledge. 1626 */ 1627 hammer_flush_inode_core(ip, flg, flags); 1628 break; 1629 case HAMMER_FST_SETUP: 1630 /* 1631 * Recurse upwards through dependancies via target_list 1632 * and start their flusher actions going if possible. 1633 * 1634 * 'good' is our connectivity. -1 means we have none and 1635 * can't flush, 0 means there weren't any dependancies, and 1636 * 1 means we have good connectivity. 1637 */ 1638 good = hammer_setup_parent_inodes(ip, 0, flg); 1639 1640 if (good >= 0) { 1641 /* 1642 * We can continue if good >= 0. Determine how 1643 * many records under our inode can be flushed (and 1644 * mark them). 1645 */ 1646 hammer_flush_inode_core(ip, flg, flags); 1647 } else { 1648 /* 1649 * Parent has no connectivity, tell it to flush 1650 * us as soon as it does. 1651 * 1652 * The REFLUSH flag is also needed to trigger 1653 * dependancy wakeups. 1654 */ 1655 ip->flags |= HAMMER_INODE_CONN_DOWN | 1656 HAMMER_INODE_REFLUSH; 1657 if (flags & HAMMER_FLUSH_SIGNAL) { 1658 ip->flags |= HAMMER_INODE_RESIGNAL; 1659 hammer_flusher_async(ip->hmp, flg); 1660 } 1661 } 1662 break; 1663 case HAMMER_FST_FLUSH: 1664 /* 1665 * We are already flushing, flag the inode to reflush 1666 * if needed after it completes its current flush. 1667 * 1668 * The REFLUSH flag is also needed to trigger 1669 * dependancy wakeups. 1670 */ 1671 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1672 ip->flags |= HAMMER_INODE_REFLUSH; 1673 if (flags & HAMMER_FLUSH_SIGNAL) { 1674 ip->flags |= HAMMER_INODE_RESIGNAL; 1675 hammer_flusher_async(ip->hmp, flg); 1676 } 1677 break; 1678 } 1679 } 1680 1681 /* 1682 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1683 * ip which reference our ip. 1684 * 1685 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1686 * so for now do not ref/deref the structures. Note that if we use the 1687 * ref/rel code later, the rel CAN block. 1688 */ 1689 static int 1690 hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 1691 hammer_flush_group_t flg) 1692 { 1693 hammer_record_t depend; 1694 int good; 1695 int r; 1696 1697 /* 1698 * If we hit our recursion limit and we have parent dependencies 1699 * We cannot continue. Returning < 0 will cause us to be flagged 1700 * for reflush. Returning -2 cuts off additional dependency checks 1701 * because they are likely to also hit the depth limit. 1702 * 1703 * We cannot return < 0 if there are no dependencies or there might 1704 * not be anything to wakeup (ip). 1705 */ 1706 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) { 1707 kprintf("HAMMER Warning: depth limit reached on " 1708 "setup recursion, inode %p %016llx\n", 1709 ip, (long long)ip->obj_id); 1710 return(-2); 1711 } 1712 1713 /* 1714 * Scan dependencies 1715 */ 1716 good = 0; 1717 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1718 r = hammer_setup_parent_inodes_helper(depend, depth, flg); 1719 KKASSERT(depend->target_ip == ip); 1720 if (r < 0 && good == 0) 1721 good = -1; 1722 if (r > 0) 1723 good = 1; 1724 1725 /* 1726 * If we failed due to the recursion depth limit then stop 1727 * now. 1728 */ 1729 if (r == -2) 1730 break; 1731 } 1732 return(good); 1733 } 1734 1735 /* 1736 * This helper function takes a record representing the dependancy between 1737 * the parent inode and child inode. 1738 * 1739 * record->ip = parent inode 1740 * record->target_ip = child inode 1741 * 1742 * We are asked to recurse upwards and convert the record from SETUP 1743 * to FLUSH if possible. 1744 * 1745 * Return 1 if the record gives us connectivity 1746 * 1747 * Return 0 if the record is not relevant 1748 * 1749 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1750 */ 1751 static int 1752 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth, 1753 hammer_flush_group_t flg) 1754 { 1755 hammer_mount_t hmp; 1756 hammer_inode_t pip; 1757 int good; 1758 1759 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1760 pip = record->ip; 1761 hmp = pip->hmp; 1762 1763 /* 1764 * If the record is already flushing, is it in our flush group? 1765 * 1766 * If it is in our flush group but it is a general record or a 1767 * delete-on-disk, it does not improve our connectivity (return 0), 1768 * and if the target inode is not trying to destroy itself we can't 1769 * allow the operation yet anyway (the second return -1). 1770 */ 1771 if (record->flush_state == HAMMER_FST_FLUSH) { 1772 /* 1773 * If not in our flush group ask the parent to reflush 1774 * us as soon as possible. 1775 */ 1776 if (record->flush_group != flg) { 1777 pip->flags |= HAMMER_INODE_REFLUSH; 1778 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1779 return(-1); 1780 } 1781 1782 /* 1783 * If in our flush group everything is already set up, 1784 * just return whether the record will improve our 1785 * visibility or not. 1786 */ 1787 if (record->type == HAMMER_MEM_RECORD_ADD) 1788 return(1); 1789 return(0); 1790 } 1791 1792 /* 1793 * It must be a setup record. Try to resolve the setup dependancies 1794 * by recursing upwards so we can place ip on the flush list. 1795 * 1796 * Limit ourselves to 20 levels of recursion to avoid blowing out 1797 * the kernel stack. If we hit the recursion limit we can't flush 1798 * until the parent flushes. The parent will flush independantly 1799 * on its own and ultimately a deep recursion will be resolved. 1800 */ 1801 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1802 1803 good = hammer_setup_parent_inodes(pip, depth + 1, flg); 1804 1805 /* 1806 * If good < 0 the parent has no connectivity and we cannot safely 1807 * flush the directory entry, which also means we can't flush our 1808 * ip. Flag us for downward recursion once the parent's 1809 * connectivity is resolved. Flag the parent for [re]flush or it 1810 * may not check for downward recursions. 1811 */ 1812 if (good < 0) { 1813 pip->flags |= HAMMER_INODE_REFLUSH; 1814 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1815 return(good); 1816 } 1817 1818 /* 1819 * We are go, place the parent inode in a flushing state so we can 1820 * place its record in a flushing state. Note that the parent 1821 * may already be flushing. The record must be in the same flush 1822 * group as the parent. 1823 */ 1824 if (pip->flush_state != HAMMER_FST_FLUSH) 1825 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 1826 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 1827 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1828 1829 #if 0 1830 if (record->type == HAMMER_MEM_RECORD_DEL && 1831 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 1832 /* 1833 * Regardless of flushing state we cannot sync this path if the 1834 * record represents a delete-on-disk but the target inode 1835 * is not ready to sync its own deletion. 1836 * 1837 * XXX need to count effective nlinks to determine whether 1838 * the flush is ok, otherwise removing a hardlink will 1839 * just leave the DEL record to rot. 1840 */ 1841 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 1842 return(-1); 1843 } else 1844 #endif 1845 if (pip->flush_group == flg) { 1846 /* 1847 * Because we have not calculated nlinks yet we can just 1848 * set records to the flush state if the parent is in 1849 * the same flush group as we are. 1850 */ 1851 record->flush_state = HAMMER_FST_FLUSH; 1852 record->flush_group = flg; 1853 ++record->flush_group->refs; 1854 hammer_ref(&record->lock); 1855 1856 /* 1857 * A general directory-add contributes to our visibility. 1858 * 1859 * Otherwise it is probably a directory-delete or 1860 * delete-on-disk record and does not contribute to our 1861 * visbility (but we can still flush it). 1862 */ 1863 if (record->type == HAMMER_MEM_RECORD_ADD) 1864 return(1); 1865 return(0); 1866 } else { 1867 /* 1868 * If the parent is not in our flush group we cannot 1869 * flush this record yet, there is no visibility. 1870 * We tell the parent to reflush and mark ourselves 1871 * so the parent knows it should flush us too. 1872 */ 1873 pip->flags |= HAMMER_INODE_REFLUSH; 1874 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1875 return(-1); 1876 } 1877 } 1878 1879 /* 1880 * This is the core routine placing an inode into the FST_FLUSH state. 1881 */ 1882 static void 1883 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 1884 { 1885 int go_count; 1886 1887 /* 1888 * Set flush state and prevent the flusher from cycling into 1889 * the next flush group. Do not place the ip on the list yet. 1890 * Inodes not in the idle state get an extra reference. 1891 */ 1892 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 1893 if (ip->flush_state == HAMMER_FST_IDLE) 1894 hammer_ref(&ip->lock); 1895 ip->flush_state = HAMMER_FST_FLUSH; 1896 ip->flush_group = flg; 1897 ++ip->hmp->flusher.group_lock; 1898 ++ip->hmp->count_iqueued; 1899 ++hammer_count_iqueued; 1900 ++flg->total_count; 1901 1902 /* 1903 * If the flush group reaches the autoflush limit we want to signal 1904 * the flusher. This is particularly important for remove()s. 1905 */ 1906 if (flg->total_count == hammer_autoflush) 1907 flags |= HAMMER_FLUSH_SIGNAL; 1908 1909 /* 1910 * We need to be able to vfsync/truncate from the backend. 1911 */ 1912 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 1913 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 1914 ip->flags |= HAMMER_INODE_VHELD; 1915 vref(ip->vp); 1916 } 1917 1918 /* 1919 * Figure out how many in-memory records we can actually flush 1920 * (not including inode meta-data, buffers, etc). 1921 */ 1922 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 1923 if (flags & HAMMER_FLUSH_RECURSION) { 1924 /* 1925 * If this is a upwards recursion we do not want to 1926 * recurse down again! 1927 */ 1928 go_count = 1; 1929 #if 0 1930 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 1931 /* 1932 * No new records are added if we must complete a flush 1933 * from a previous cycle, but we do have to move the records 1934 * from the previous cycle to the current one. 1935 */ 1936 #if 0 1937 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1938 hammer_syncgrp_child_callback, NULL); 1939 #endif 1940 go_count = 1; 1941 #endif 1942 } else { 1943 /* 1944 * Normal flush, scan records and bring them into the flush. 1945 * Directory adds and deletes are usually skipped (they are 1946 * grouped with the related inode rather then with the 1947 * directory). 1948 * 1949 * go_count can be negative, which means the scan aborted 1950 * due to the flush group being over-full and we should 1951 * flush what we have. 1952 */ 1953 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1954 hammer_setup_child_callback, NULL); 1955 } 1956 1957 /* 1958 * This is a more involved test that includes go_count. If we 1959 * can't flush, flag the inode and return. If go_count is 0 we 1960 * were are unable to flush any records in our rec_tree and 1961 * must ignore the XDIRTY flag. 1962 */ 1963 if (go_count == 0) { 1964 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 1965 --ip->hmp->count_iqueued; 1966 --hammer_count_iqueued; 1967 1968 --flg->total_count; 1969 ip->flush_state = HAMMER_FST_SETUP; 1970 ip->flush_group = NULL; 1971 if (ip->flags & HAMMER_INODE_VHELD) { 1972 ip->flags &= ~HAMMER_INODE_VHELD; 1973 vrele(ip->vp); 1974 } 1975 1976 /* 1977 * REFLUSH is needed to trigger dependancy wakeups 1978 * when an inode is in SETUP. 1979 */ 1980 ip->flags |= HAMMER_INODE_REFLUSH; 1981 if (flags & HAMMER_FLUSH_SIGNAL) { 1982 ip->flags |= HAMMER_INODE_RESIGNAL; 1983 hammer_flusher_async(ip->hmp, flg); 1984 } 1985 if (--ip->hmp->flusher.group_lock == 0) 1986 wakeup(&ip->hmp->flusher.group_lock); 1987 return; 1988 } 1989 } 1990 1991 /* 1992 * Snapshot the state of the inode for the backend flusher. 1993 * 1994 * We continue to retain save_trunc_off even when all truncations 1995 * have been resolved as an optimization to determine if we can 1996 * skip the B-Tree lookup for overwrite deletions. 1997 * 1998 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 1999 * and stays in ip->flags. Once set, it stays set until the 2000 * inode is destroyed. 2001 */ 2002 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2003 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 2004 ip->sync_trunc_off = ip->trunc_off; 2005 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 2006 ip->flags &= ~HAMMER_INODE_TRUNCATED; 2007 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 2008 2009 /* 2010 * The save_trunc_off used to cache whether the B-Tree 2011 * holds any records past that point is not used until 2012 * after the truncation has succeeded, so we can safely 2013 * set it now. 2014 */ 2015 if (ip->save_trunc_off > ip->sync_trunc_off) 2016 ip->save_trunc_off = ip->sync_trunc_off; 2017 } 2018 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 2019 ~HAMMER_INODE_TRUNCATED); 2020 ip->sync_ino_leaf = ip->ino_leaf; 2021 ip->sync_ino_data = ip->ino_data; 2022 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 2023 #ifdef DEBUG_TRUNCATE 2024 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp) 2025 kprintf("truncateS %016llx\n", ip->sync_trunc_off); 2026 #endif 2027 2028 /* 2029 * The flusher list inherits our inode and reference. 2030 */ 2031 KKASSERT(flg->running == 0); 2032 TAILQ_INSERT_TAIL(&flg->flush_list, ip, flush_entry); 2033 if (--ip->hmp->flusher.group_lock == 0) 2034 wakeup(&ip->hmp->flusher.group_lock); 2035 2036 if (flags & HAMMER_FLUSH_SIGNAL) { 2037 hammer_flusher_async(ip->hmp, flg); 2038 } 2039 } 2040 2041 /* 2042 * Callback for scan of ip->rec_tree. Try to include each record in our 2043 * flush. ip->flush_group has been set but the inode has not yet been 2044 * moved into a flushing state. 2045 * 2046 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 2047 * both inodes. 2048 * 2049 * We return 1 for any record placed or found in FST_FLUSH, which prevents 2050 * the caller from shortcutting the flush. 2051 */ 2052 static int 2053 hammer_setup_child_callback(hammer_record_t rec, void *data) 2054 { 2055 hammer_flush_group_t flg; 2056 hammer_inode_t target_ip; 2057 hammer_inode_t ip; 2058 int r; 2059 2060 /* 2061 * Records deleted or committed by the backend are ignored. 2062 * Note that the flush detects deleted frontend records at 2063 * multiple points to deal with races. This is just the first 2064 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot 2065 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it 2066 * messes up link-count calculations. 2067 * 2068 * NOTE: Don't get confused between record deletion and, say, 2069 * directory entry deletion. The deletion of a directory entry 2070 * which is on-media has nothing to do with the record deletion 2071 * flags. 2072 */ 2073 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 2074 HAMMER_RECF_COMMITTED)) { 2075 if (rec->flush_state == HAMMER_FST_FLUSH) { 2076 KKASSERT(rec->flush_group == rec->ip->flush_group); 2077 r = 1; 2078 } else { 2079 r = 0; 2080 } 2081 return(r); 2082 } 2083 2084 /* 2085 * If the record is in an idle state it has no dependancies and 2086 * can be flushed. 2087 */ 2088 ip = rec->ip; 2089 flg = ip->flush_group; 2090 r = 0; 2091 2092 switch(rec->flush_state) { 2093 case HAMMER_FST_IDLE: 2094 /* 2095 * The record has no setup dependancy, we can flush it. 2096 */ 2097 KKASSERT(rec->target_ip == NULL); 2098 rec->flush_state = HAMMER_FST_FLUSH; 2099 rec->flush_group = flg; 2100 ++flg->refs; 2101 hammer_ref(&rec->lock); 2102 r = 1; 2103 break; 2104 case HAMMER_FST_SETUP: 2105 /* 2106 * The record has a setup dependancy. These are typically 2107 * directory entry adds and deletes. Such entries will be 2108 * flushed when their inodes are flushed so we do not 2109 * usually have to add them to the flush here. However, 2110 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 2111 * it is asking us to flush this record (and it). 2112 */ 2113 target_ip = rec->target_ip; 2114 KKASSERT(target_ip != NULL); 2115 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 2116 2117 /* 2118 * If the target IP is already flushing in our group 2119 * we could associate the record, but target_ip has 2120 * already synced ino_data to sync_ino_data and we 2121 * would also have to adjust nlinks. Plus there are 2122 * ordering issues for adds and deletes. 2123 * 2124 * Reflush downward if this is an ADD, and upward if 2125 * this is a DEL. 2126 */ 2127 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 2128 if (rec->flush_state == HAMMER_MEM_RECORD_ADD) 2129 ip->flags |= HAMMER_INODE_REFLUSH; 2130 else 2131 target_ip->flags |= HAMMER_INODE_REFLUSH; 2132 break; 2133 } 2134 2135 /* 2136 * Target IP is not yet flushing. This can get complex 2137 * because we have to be careful about the recursion. 2138 * 2139 * Directories create an issue for us in that if a flush 2140 * of a directory is requested the expectation is to flush 2141 * any pending directory entries, but this will cause the 2142 * related inodes to recursively flush as well. We can't 2143 * really defer the operation so just get as many as we 2144 * can and 2145 */ 2146 #if 0 2147 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 2148 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 2149 /* 2150 * We aren't reclaiming and the target ip was not 2151 * previously prevented from flushing due to this 2152 * record dependancy. Do not flush this record. 2153 */ 2154 /*r = 0;*/ 2155 } else 2156 #endif 2157 if (flg->total_count + flg->refs > 2158 ip->hmp->undo_rec_limit) { 2159 /* 2160 * Our flush group is over-full and we risk blowing 2161 * out the UNDO FIFO. Stop the scan, flush what we 2162 * have, then reflush the directory. 2163 * 2164 * The directory may be forced through multiple 2165 * flush groups before it can be completely 2166 * flushed. 2167 */ 2168 ip->flags |= HAMMER_INODE_RESIGNAL | 2169 HAMMER_INODE_REFLUSH; 2170 r = -1; 2171 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 2172 /* 2173 * If the target IP is not flushing we can force 2174 * it to flush, even if it is unable to write out 2175 * any of its own records we have at least one in 2176 * hand that we CAN deal with. 2177 */ 2178 rec->flush_state = HAMMER_FST_FLUSH; 2179 rec->flush_group = flg; 2180 ++flg->refs; 2181 hammer_ref(&rec->lock); 2182 hammer_flush_inode_core(target_ip, flg, 2183 HAMMER_FLUSH_RECURSION); 2184 r = 1; 2185 } else { 2186 /* 2187 * General or delete-on-disk record. 2188 * 2189 * XXX this needs help. If a delete-on-disk we could 2190 * disconnect the target. If the target has its own 2191 * dependancies they really need to be flushed. 2192 * 2193 * XXX 2194 */ 2195 rec->flush_state = HAMMER_FST_FLUSH; 2196 rec->flush_group = flg; 2197 ++flg->refs; 2198 hammer_ref(&rec->lock); 2199 hammer_flush_inode_core(target_ip, flg, 2200 HAMMER_FLUSH_RECURSION); 2201 r = 1; 2202 } 2203 break; 2204 case HAMMER_FST_FLUSH: 2205 /* 2206 * The flush_group should already match. 2207 */ 2208 KKASSERT(rec->flush_group == flg); 2209 r = 1; 2210 break; 2211 } 2212 return(r); 2213 } 2214 2215 #if 0 2216 /* 2217 * This version just moves records already in a flush state to the new 2218 * flush group and that is it. 2219 */ 2220 static int 2221 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 2222 { 2223 hammer_inode_t ip = rec->ip; 2224 2225 switch(rec->flush_state) { 2226 case HAMMER_FST_FLUSH: 2227 KKASSERT(rec->flush_group == ip->flush_group); 2228 break; 2229 default: 2230 break; 2231 } 2232 return(0); 2233 } 2234 #endif 2235 2236 /* 2237 * Wait for a previously queued flush to complete. 2238 * 2239 * If a critical error occured we don't try to wait. 2240 */ 2241 void 2242 hammer_wait_inode(hammer_inode_t ip) 2243 { 2244 hammer_flush_group_t flg; 2245 2246 flg = NULL; 2247 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2248 while (ip->flush_state != HAMMER_FST_IDLE && 2249 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2250 if (ip->flush_state == HAMMER_FST_SETUP) 2251 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2252 if (ip->flush_state != HAMMER_FST_IDLE) { 2253 ip->flags |= HAMMER_INODE_FLUSHW; 2254 tsleep(&ip->flags, 0, "hmrwin", 0); 2255 } 2256 } 2257 } 2258 } 2259 2260 /* 2261 * Called by the backend code when a flush has been completed. 2262 * The inode has already been removed from the flush list. 2263 * 2264 * A pipelined flush can occur, in which case we must re-enter the 2265 * inode on the list and re-copy its fields. 2266 */ 2267 void 2268 hammer_flush_inode_done(hammer_inode_t ip, int error) 2269 { 2270 hammer_mount_t hmp; 2271 int dorel; 2272 2273 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2274 2275 hmp = ip->hmp; 2276 2277 /* 2278 * Auto-reflush if the backend could not completely flush 2279 * the inode. This fixes a case where a deferred buffer flush 2280 * could cause fsync to return early. 2281 */ 2282 if (ip->sync_flags & HAMMER_INODE_MODMASK) 2283 ip->flags |= HAMMER_INODE_REFLUSH; 2284 2285 /* 2286 * Merge left-over flags back into the frontend and fix the state. 2287 * Incomplete truncations are retained by the backend. 2288 */ 2289 ip->error = error; 2290 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2291 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2292 2293 /* 2294 * The backend may have adjusted nlinks, so if the adjusted nlinks 2295 * does not match the fronttend set the frontend's RDIRTY flag again. 2296 */ 2297 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2298 ip->flags |= HAMMER_INODE_DDIRTY; 2299 2300 /* 2301 * Fix up the dirty buffer status. 2302 */ 2303 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2304 ip->flags |= HAMMER_INODE_BUFS; 2305 } 2306 2307 /* 2308 * Re-set the XDIRTY flag if some of the inode's in-memory records 2309 * could not be flushed. 2310 */ 2311 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2312 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2313 (!RB_EMPTY(&ip->rec_tree) && 2314 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2315 2316 /* 2317 * Do not lose track of inodes which no longer have vnode 2318 * assocations, otherwise they may never get flushed again. 2319 * 2320 * The reflush flag can be set superfluously, causing extra pain 2321 * for no reason. If the inode is no longer modified it no longer 2322 * needs to be flushed. 2323 */ 2324 if (ip->flags & HAMMER_INODE_MODMASK) { 2325 if (ip->vp == NULL) 2326 ip->flags |= HAMMER_INODE_REFLUSH; 2327 } else { 2328 ip->flags &= ~HAMMER_INODE_REFLUSH; 2329 } 2330 2331 /* 2332 * Adjust the flush state. 2333 */ 2334 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2335 /* 2336 * We were unable to flush out all our records, leave the 2337 * inode in a flush state and in the current flush group. 2338 * The flush group will be re-run. 2339 * 2340 * This occurs if the UNDO block gets too full or there is 2341 * too much dirty meta-data and allows the flusher to 2342 * finalize the UNDO block and then re-flush. 2343 */ 2344 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2345 dorel = 0; 2346 } else { 2347 /* 2348 * Remove from the flush_group 2349 */ 2350 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 2351 ip->flush_group = NULL; 2352 2353 /* 2354 * Clean up the vnode ref and tracking counts. 2355 */ 2356 if (ip->flags & HAMMER_INODE_VHELD) { 2357 ip->flags &= ~HAMMER_INODE_VHELD; 2358 vrele(ip->vp); 2359 } 2360 --hmp->count_iqueued; 2361 --hammer_count_iqueued; 2362 2363 /* 2364 * And adjust the state. 2365 */ 2366 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2367 ip->flush_state = HAMMER_FST_IDLE; 2368 dorel = 1; 2369 } else { 2370 ip->flush_state = HAMMER_FST_SETUP; 2371 dorel = 0; 2372 } 2373 2374 /* 2375 * If the frontend is waiting for a flush to complete, 2376 * wake it up. 2377 */ 2378 if (ip->flags & HAMMER_INODE_FLUSHW) { 2379 ip->flags &= ~HAMMER_INODE_FLUSHW; 2380 wakeup(&ip->flags); 2381 } 2382 2383 /* 2384 * If the frontend made more changes and requested another 2385 * flush, then try to get it running. 2386 * 2387 * Reflushes are aborted when the inode is errored out. 2388 */ 2389 if (ip->flags & HAMMER_INODE_REFLUSH) { 2390 ip->flags &= ~HAMMER_INODE_REFLUSH; 2391 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2392 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2393 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2394 } else { 2395 hammer_flush_inode(ip, 0); 2396 } 2397 } 2398 } 2399 2400 /* 2401 * If we have no parent dependancies we can clear CONN_DOWN 2402 */ 2403 if (TAILQ_EMPTY(&ip->target_list)) 2404 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2405 2406 /* 2407 * If the inode is now clean drop the space reservation. 2408 */ 2409 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2410 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2411 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2412 --hmp->rsv_inodes; 2413 } 2414 2415 if (dorel) 2416 hammer_rel_inode(ip, 0); 2417 } 2418 2419 /* 2420 * Called from hammer_sync_inode() to synchronize in-memory records 2421 * to the media. 2422 */ 2423 static int 2424 hammer_sync_record_callback(hammer_record_t record, void *data) 2425 { 2426 hammer_cursor_t cursor = data; 2427 hammer_transaction_t trans = cursor->trans; 2428 hammer_mount_t hmp = trans->hmp; 2429 int error; 2430 2431 /* 2432 * Skip records that do not belong to the current flush. 2433 */ 2434 ++hammer_stats_record_iterations; 2435 if (record->flush_state != HAMMER_FST_FLUSH) 2436 return(0); 2437 2438 #if 1 2439 if (record->flush_group != record->ip->flush_group) { 2440 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group); 2441 Debugger("blah2"); 2442 return(0); 2443 } 2444 #endif 2445 KKASSERT(record->flush_group == record->ip->flush_group); 2446 2447 /* 2448 * Interlock the record using the BE flag. Once BE is set the 2449 * frontend cannot change the state of FE. 2450 * 2451 * NOTE: If FE is set prior to us setting BE we still sync the 2452 * record out, but the flush completion code converts it to 2453 * a delete-on-disk record instead of destroying it. 2454 */ 2455 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2456 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2457 2458 /* 2459 * The backend has already disposed of the record. 2460 */ 2461 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { 2462 error = 0; 2463 goto done; 2464 } 2465 2466 /* 2467 * If the whole inode is being deleting all on-disk records will 2468 * be deleted very soon, we can't sync any new records to disk 2469 * because they will be deleted in the same transaction they were 2470 * created in (delete_tid == create_tid), which will assert. 2471 * 2472 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2473 * that we currently panic on. 2474 */ 2475 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2476 switch(record->type) { 2477 case HAMMER_MEM_RECORD_DATA: 2478 /* 2479 * We don't have to do anything, if the record was 2480 * committed the space will have been accounted for 2481 * in the blockmap. 2482 */ 2483 /* fall through */ 2484 case HAMMER_MEM_RECORD_GENERAL: 2485 /* 2486 * Set deleted-by-backend flag. Do not set the 2487 * backend committed flag, because we are throwing 2488 * the record away. 2489 */ 2490 record->flags |= HAMMER_RECF_DELETED_BE; 2491 ++record->ip->rec_generation; 2492 error = 0; 2493 goto done; 2494 case HAMMER_MEM_RECORD_ADD: 2495 panic("hammer_sync_record_callback: illegal add " 2496 "during inode deletion record %p", record); 2497 break; /* NOT REACHED */ 2498 case HAMMER_MEM_RECORD_INODE: 2499 panic("hammer_sync_record_callback: attempt to " 2500 "sync inode record %p?", record); 2501 break; /* NOT REACHED */ 2502 case HAMMER_MEM_RECORD_DEL: 2503 /* 2504 * Follow through and issue the on-disk deletion 2505 */ 2506 break; 2507 } 2508 } 2509 2510 /* 2511 * If DELETED_FE is set special handling is needed for directory 2512 * entries. Dependant pieces related to the directory entry may 2513 * have already been synced to disk. If this occurs we have to 2514 * sync the directory entry and then change the in-memory record 2515 * from an ADD to a DELETE to cover the fact that it's been 2516 * deleted by the frontend. 2517 * 2518 * A directory delete covering record (MEM_RECORD_DEL) can never 2519 * be deleted by the frontend. 2520 * 2521 * Any other record type (aka DATA) can be deleted by the frontend. 2522 * XXX At the moment the flusher must skip it because there may 2523 * be another data record in the flush group for the same block, 2524 * meaning that some frontend data changes can leak into the backend's 2525 * synchronization point. 2526 */ 2527 if (record->flags & HAMMER_RECF_DELETED_FE) { 2528 if (record->type == HAMMER_MEM_RECORD_ADD) { 2529 /* 2530 * Convert a front-end deleted directory-add to 2531 * a directory-delete entry later. 2532 */ 2533 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2534 } else { 2535 /* 2536 * Dispose of the record (race case). Mark as 2537 * deleted by backend (and not committed). 2538 */ 2539 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2540 record->flags |= HAMMER_RECF_DELETED_BE; 2541 ++record->ip->rec_generation; 2542 error = 0; 2543 goto done; 2544 } 2545 } 2546 2547 /* 2548 * Assign the create_tid for new records. Deletions already 2549 * have the record's entire key properly set up. 2550 */ 2551 if (record->type != HAMMER_MEM_RECORD_DEL) { 2552 record->leaf.base.create_tid = trans->tid; 2553 record->leaf.create_ts = trans->time32; 2554 } 2555 for (;;) { 2556 error = hammer_ip_sync_record_cursor(cursor, record); 2557 if (error != EDEADLK) 2558 break; 2559 hammer_done_cursor(cursor); 2560 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2561 record->ip); 2562 if (error) 2563 break; 2564 } 2565 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2566 2567 if (error) 2568 error = -error; 2569 done: 2570 hammer_flush_record_done(record, error); 2571 2572 /* 2573 * Do partial finalization if we have built up too many dirty 2574 * buffers. Otherwise a buffer cache deadlock can occur when 2575 * doing things like creating tens of thousands of tiny files. 2576 * 2577 * We must release our cursor lock to avoid a 3-way deadlock 2578 * due to the exclusive sync lock the finalizer must get. 2579 */ 2580 if (hammer_flusher_meta_limit(hmp)) { 2581 hammer_unlock_cursor(cursor); 2582 hammer_flusher_finalize(trans, 0); 2583 hammer_lock_cursor(cursor); 2584 } 2585 2586 return(error); 2587 } 2588 2589 /* 2590 * Backend function called by the flusher to sync an inode to media. 2591 */ 2592 int 2593 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2594 { 2595 struct hammer_cursor cursor; 2596 hammer_node_t tmp_node; 2597 hammer_record_t depend; 2598 hammer_record_t next; 2599 int error, tmp_error; 2600 u_int64_t nlinks; 2601 2602 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2603 return(0); 2604 2605 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2606 if (error) 2607 goto done; 2608 2609 /* 2610 * Any directory records referencing this inode which are not in 2611 * our current flush group must adjust our nlink count for the 2612 * purposes of synchronization to disk. 2613 * 2614 * Records which are in our flush group can be unlinked from our 2615 * inode now, potentially allowing the inode to be physically 2616 * deleted. 2617 * 2618 * This cannot block. 2619 */ 2620 nlinks = ip->ino_data.nlinks; 2621 next = TAILQ_FIRST(&ip->target_list); 2622 while ((depend = next) != NULL) { 2623 next = TAILQ_NEXT(depend, target_entry); 2624 if (depend->flush_state == HAMMER_FST_FLUSH && 2625 depend->flush_group == ip->flush_group) { 2626 /* 2627 * If this is an ADD that was deleted by the frontend 2628 * the frontend nlinks count will have already been 2629 * decremented, but the backend is going to sync its 2630 * directory entry and must account for it. The 2631 * record will be converted to a delete-on-disk when 2632 * it gets synced. 2633 * 2634 * If the ADD was not deleted by the frontend we 2635 * can remove the dependancy from our target_list. 2636 */ 2637 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2638 ++nlinks; 2639 } else { 2640 TAILQ_REMOVE(&ip->target_list, depend, 2641 target_entry); 2642 depend->target_ip = NULL; 2643 } 2644 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2645 /* 2646 * Not part of our flush group and not deleted by 2647 * the front-end, adjust the link count synced to 2648 * the media (undo what the frontend did when it 2649 * queued the record). 2650 */ 2651 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2652 switch(depend->type) { 2653 case HAMMER_MEM_RECORD_ADD: 2654 --nlinks; 2655 break; 2656 case HAMMER_MEM_RECORD_DEL: 2657 ++nlinks; 2658 break; 2659 default: 2660 break; 2661 } 2662 } 2663 } 2664 2665 /* 2666 * Set dirty if we had to modify the link count. 2667 */ 2668 if (ip->sync_ino_data.nlinks != nlinks) { 2669 KKASSERT((int64_t)nlinks >= 0); 2670 ip->sync_ino_data.nlinks = nlinks; 2671 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2672 } 2673 2674 /* 2675 * If there is a trunction queued destroy any data past the (aligned) 2676 * truncation point. Userland will have dealt with the buffer 2677 * containing the truncation point for us. 2678 * 2679 * We don't flush pending frontend data buffers until after we've 2680 * dealt with the truncation. 2681 */ 2682 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2683 /* 2684 * Interlock trunc_off. The VOP front-end may continue to 2685 * make adjustments to it while we are blocked. 2686 */ 2687 off_t trunc_off; 2688 off_t aligned_trunc_off; 2689 int blkmask; 2690 2691 trunc_off = ip->sync_trunc_off; 2692 blkmask = hammer_blocksize(trunc_off) - 1; 2693 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2694 2695 /* 2696 * Delete any whole blocks on-media. The front-end has 2697 * already cleaned out any partial block and made it 2698 * pending. The front-end may have updated trunc_off 2699 * while we were blocked so we only use sync_trunc_off. 2700 * 2701 * This operation can blow out the buffer cache, EWOULDBLOCK 2702 * means we were unable to complete the deletion. The 2703 * deletion will update sync_trunc_off in that case. 2704 */ 2705 error = hammer_ip_delete_range(&cursor, ip, 2706 aligned_trunc_off, 2707 0x7FFFFFFFFFFFFFFFLL, 2); 2708 if (error == EWOULDBLOCK) { 2709 ip->flags |= HAMMER_INODE_WOULDBLOCK; 2710 error = 0; 2711 goto defer_buffer_flush; 2712 } 2713 2714 if (error) 2715 goto done; 2716 2717 /* 2718 * Clear the truncation flag on the backend after we have 2719 * complete the deletions. Backend data is now good again 2720 * (including new records we are about to sync, below). 2721 * 2722 * Leave sync_trunc_off intact. As we write additional 2723 * records the backend will update sync_trunc_off. This 2724 * tells the backend whether it can skip the overwrite 2725 * test. This should work properly even when the backend 2726 * writes full blocks where the truncation point straddles 2727 * the block because the comparison is against the base 2728 * offset of the record. 2729 */ 2730 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2731 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 2732 } else { 2733 error = 0; 2734 } 2735 2736 /* 2737 * Now sync related records. These will typically be directory 2738 * entries, records tracking direct-writes, or delete-on-disk records. 2739 */ 2740 if (error == 0) { 2741 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2742 hammer_sync_record_callback, &cursor); 2743 if (tmp_error < 0) 2744 tmp_error = -error; 2745 if (tmp_error) 2746 error = tmp_error; 2747 } 2748 hammer_cache_node(&ip->cache[1], cursor.node); 2749 2750 /* 2751 * Re-seek for inode update, assuming our cache hasn't been ripped 2752 * out from under us. 2753 */ 2754 if (error == 0) { 2755 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error); 2756 if (tmp_node) { 2757 hammer_cursor_downgrade(&cursor); 2758 hammer_lock_sh(&tmp_node->lock); 2759 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 2760 hammer_cursor_seek(&cursor, tmp_node, 0); 2761 hammer_unlock(&tmp_node->lock); 2762 hammer_rel_node(tmp_node); 2763 } 2764 error = 0; 2765 } 2766 2767 /* 2768 * If we are deleting the inode the frontend had better not have 2769 * any active references on elements making up the inode. 2770 * 2771 * The call to hammer_ip_delete_clean() cleans up auxillary records 2772 * but not DB or DATA records. Those must have already been deleted 2773 * by the normal truncation mechanic. 2774 */ 2775 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 2776 RB_EMPTY(&ip->rec_tree) && 2777 (ip->sync_flags & HAMMER_INODE_DELETING) && 2778 (ip->flags & HAMMER_INODE_DELETED) == 0) { 2779 int count1 = 0; 2780 2781 error = hammer_ip_delete_clean(&cursor, ip, &count1); 2782 if (error == 0) { 2783 ip->flags |= HAMMER_INODE_DELETED; 2784 ip->sync_flags &= ~HAMMER_INODE_DELETING; 2785 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2786 KKASSERT(RB_EMPTY(&ip->rec_tree)); 2787 2788 /* 2789 * Set delete_tid in both the frontend and backend 2790 * copy of the inode record. The DELETED flag handles 2791 * this, do not set RDIRTY. 2792 */ 2793 ip->ino_leaf.base.delete_tid = trans->tid; 2794 ip->sync_ino_leaf.base.delete_tid = trans->tid; 2795 ip->ino_leaf.delete_ts = trans->time32; 2796 ip->sync_ino_leaf.delete_ts = trans->time32; 2797 2798 2799 /* 2800 * Adjust the inode count in the volume header 2801 */ 2802 hammer_sync_lock_sh(trans); 2803 if (ip->flags & HAMMER_INODE_ONDISK) { 2804 hammer_modify_volume_field(trans, 2805 trans->rootvol, 2806 vol0_stat_inodes); 2807 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 2808 hammer_modify_volume_done(trans->rootvol); 2809 } 2810 hammer_sync_unlock(trans); 2811 } 2812 } 2813 2814 if (error) 2815 goto done; 2816 ip->sync_flags &= ~HAMMER_INODE_BUFS; 2817 2818 defer_buffer_flush: 2819 /* 2820 * Now update the inode's on-disk inode-data and/or on-disk record. 2821 * DELETED and ONDISK are managed only in ip->flags. 2822 * 2823 * In the case of a defered buffer flush we still update the on-disk 2824 * inode to satisfy visibility requirements if there happen to be 2825 * directory dependancies. 2826 */ 2827 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 2828 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 2829 /* 2830 * If deleted and on-disk, don't set any additional flags. 2831 * the delete flag takes care of things. 2832 * 2833 * Clear flags which may have been set by the frontend. 2834 */ 2835 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2836 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2837 HAMMER_INODE_DELETING); 2838 break; 2839 case HAMMER_INODE_DELETED: 2840 /* 2841 * Take care of the case where a deleted inode was never 2842 * flushed to the disk in the first place. 2843 * 2844 * Clear flags which may have been set by the frontend. 2845 */ 2846 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2847 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2848 HAMMER_INODE_DELETING); 2849 while (RB_ROOT(&ip->rec_tree)) { 2850 hammer_record_t record = RB_ROOT(&ip->rec_tree); 2851 hammer_ref(&record->lock); 2852 KKASSERT(record->lock.refs == 1); 2853 record->flags |= HAMMER_RECF_DELETED_BE; 2854 ++record->ip->rec_generation; 2855 hammer_rel_mem_record(record); 2856 } 2857 break; 2858 case HAMMER_INODE_ONDISK: 2859 /* 2860 * If already on-disk, do not set any additional flags. 2861 */ 2862 break; 2863 default: 2864 /* 2865 * If not on-disk and not deleted, set DDIRTY to force 2866 * an initial record to be written. 2867 * 2868 * Also set the create_tid in both the frontend and backend 2869 * copy of the inode record. 2870 */ 2871 ip->ino_leaf.base.create_tid = trans->tid; 2872 ip->ino_leaf.create_ts = trans->time32; 2873 ip->sync_ino_leaf.base.create_tid = trans->tid; 2874 ip->sync_ino_leaf.create_ts = trans->time32; 2875 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2876 break; 2877 } 2878 2879 /* 2880 * If RDIRTY or DDIRTY is set, write out a new record. If the inode 2881 * is already on-disk the old record is marked as deleted. 2882 * 2883 * If DELETED is set hammer_update_inode() will delete the existing 2884 * record without writing out a new one. 2885 * 2886 * If *ONLY* the ITIMES flag is set we can update the record in-place. 2887 */ 2888 if (ip->flags & HAMMER_INODE_DELETED) { 2889 error = hammer_update_inode(&cursor, ip); 2890 } else 2891 if ((ip->sync_flags & HAMMER_INODE_DDIRTY) == 0 && 2892 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 2893 error = hammer_update_itimes(&cursor, ip); 2894 } else 2895 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 2896 error = hammer_update_inode(&cursor, ip); 2897 } 2898 done: 2899 if (error) { 2900 hammer_critical_error(ip->hmp, ip, error, 2901 "while syncing inode"); 2902 } 2903 hammer_done_cursor(&cursor); 2904 return(error); 2905 } 2906 2907 /* 2908 * This routine is called when the OS is no longer actively referencing 2909 * the inode (but might still be keeping it cached), or when releasing 2910 * the last reference to an inode. 2911 * 2912 * At this point if the inode's nlinks count is zero we want to destroy 2913 * it, which may mean destroying it on-media too. 2914 */ 2915 void 2916 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 2917 { 2918 struct vnode *vp; 2919 2920 /* 2921 * Set the DELETING flag when the link count drops to 0 and the 2922 * OS no longer has any opens on the inode. 2923 * 2924 * The backend will clear DELETING (a mod flag) and set DELETED 2925 * (a state flag) when it is actually able to perform the 2926 * operation. 2927 * 2928 * Don't reflag the deletion if the flusher is currently syncing 2929 * one that was already flagged. A previously set DELETING flag 2930 * may bounce around flags and sync_flags until the operation is 2931 * completely done. 2932 */ 2933 if (ip->ino_data.nlinks == 0 && 2934 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 2935 ip->flags |= HAMMER_INODE_DELETING; 2936 ip->flags |= HAMMER_INODE_TRUNCATED; 2937 ip->trunc_off = 0; 2938 vp = NULL; 2939 if (getvp) { 2940 if (hammer_get_vnode(ip, &vp) != 0) 2941 return; 2942 } 2943 2944 /* 2945 * Final cleanup 2946 */ 2947 if (ip->vp) { 2948 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); 2949 vnode_pager_setsize(ip->vp, 0); 2950 } 2951 if (getvp) { 2952 vput(vp); 2953 } 2954 } 2955 } 2956 2957 /* 2958 * After potentially resolving a dependancy the inode is tested 2959 * to determine whether it needs to be reflushed. 2960 */ 2961 void 2962 hammer_test_inode(hammer_inode_t ip) 2963 { 2964 if (ip->flags & HAMMER_INODE_REFLUSH) { 2965 ip->flags &= ~HAMMER_INODE_REFLUSH; 2966 hammer_ref(&ip->lock); 2967 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2968 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2969 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2970 } else { 2971 hammer_flush_inode(ip, 0); 2972 } 2973 hammer_rel_inode(ip, 0); 2974 } 2975 } 2976 2977 /* 2978 * Clear the RECLAIM flag on an inode. This occurs when the inode is 2979 * reassociated with a vp or just before it gets freed. 2980 * 2981 * Pipeline wakeups to threads blocked due to an excessive number of 2982 * detached inodes. The reclaim count generates a bit of negative 2983 * feedback. 2984 */ 2985 static void 2986 hammer_inode_wakereclaims(hammer_inode_t ip, int dowake) 2987 { 2988 struct hammer_reclaim *reclaim; 2989 hammer_mount_t hmp = ip->hmp; 2990 2991 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 2992 return; 2993 2994 --hammer_count_reclaiming; 2995 --hmp->inode_reclaims; 2996 ip->flags &= ~HAMMER_INODE_RECLAIM; 2997 2998 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT || dowake) { 2999 reclaim = TAILQ_FIRST(&hmp->reclaim_list); 3000 if (reclaim && reclaim->count > 0 && --reclaim->count == 0) { 3001 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 3002 wakeup(reclaim); 3003 } 3004 } 3005 } 3006 3007 /* 3008 * Setup our reclaim pipeline. We only let so many detached (and dirty) 3009 * inodes build up before we start blocking. 3010 * 3011 * When we block we don't care *which* inode has finished reclaiming, 3012 * as lone as one does. This is somewhat heuristical... we also put a 3013 * cap on how long we are willing to wait. 3014 */ 3015 void 3016 hammer_inode_waitreclaims(hammer_mount_t hmp) 3017 { 3018 struct hammer_reclaim reclaim; 3019 int delay; 3020 3021 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT) 3022 return; 3023 delay = (hmp->inode_reclaims - HAMMER_RECLAIM_WAIT) * hz / 3024 (HAMMER_RECLAIM_WAIT * 3) + 1; 3025 if (delay > 0) { 3026 reclaim.count = 2; 3027 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry); 3028 tsleep(&reclaim, 0, "hmrrcm", delay); 3029 if (reclaim.count > 0) 3030 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 3031 } 3032 } 3033 3034 /* 3035 * A larger then normal backlog of inodes is sitting in the flusher, 3036 * enforce a general slowdown to let it catch up. This routine is only 3037 * called on completion of a non-flusher-related transaction which 3038 * performed B-Tree node I/O. 3039 * 3040 * It is possible for the flusher to stall in a continuous load. 3041 * blogbench -i1000 -o seems to do a good job generating this sort of load. 3042 * If the flusher is unable to catch up the inode count can bloat until 3043 * we run out of kvm. 3044 * 3045 * This is a bit of a hack. 3046 */ 3047 void 3048 hammer_inode_waithard(hammer_mount_t hmp) 3049 { 3050 /* 3051 * Hysteresis. 3052 */ 3053 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) { 3054 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT / 2 && 3055 hmp->count_iqueued < hmp->count_inodes / 20) { 3056 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY; 3057 return; 3058 } 3059 } else { 3060 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT || 3061 hmp->count_iqueued < hmp->count_inodes / 10) { 3062 return; 3063 } 3064 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY; 3065 } 3066 3067 /* 3068 * Block for one flush cycle. 3069 */ 3070 hammer_flusher_wait_next(hmp); 3071 } 3072 3073