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 35 #include <vm/vm_page2.h> 36 37 #include "hammer.h" 38 39 static int hammer_unload_inode(struct hammer_inode *ip); 40 static void hammer_free_inode(hammer_inode_t ip); 41 static void hammer_flush_inode_core(hammer_inode_t ip, 42 hammer_flush_group_t flg, int flags); 43 static int hammer_setup_child_callback(hammer_record_t rec, void *data); 44 #if 0 45 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data); 46 #endif 47 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 48 hammer_flush_group_t flg); 49 static int hammer_setup_parent_inodes_helper(hammer_record_t record, 50 int depth, hammer_flush_group_t flg); 51 static void hammer_inode_wakereclaims(hammer_inode_t ip); 52 static struct hammer_inostats *hammer_inode_inostats(hammer_mount_t hmp, 53 pid_t pid); 54 static struct hammer_inode *__hammer_find_inode(hammer_transaction_t trans, 55 int64_t obj_id, hammer_tid_t asof, 56 uint32_t localization); 57 58 struct krate hammer_gen_krate = { 1 }; 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 int 82 hammer_redo_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2) 83 { 84 if (ip1->redo_fifo_start < ip2->redo_fifo_start) 85 return(-1); 86 if (ip1->redo_fifo_start > ip2->redo_fifo_start) 87 return(1); 88 return(0); 89 } 90 91 /* 92 * RB-Tree support for inode structures / special LOOKUP_INFO 93 */ 94 static int 95 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip) 96 { 97 if (info->obj_localization < ip->obj_localization) 98 return(-1); 99 if (info->obj_localization > ip->obj_localization) 100 return(1); 101 if (info->obj_id < ip->obj_id) 102 return(-1); 103 if (info->obj_id > ip->obj_id) 104 return(1); 105 if (info->obj_asof < ip->obj_asof) 106 return(-1); 107 if (info->obj_asof > ip->obj_asof) 108 return(1); 109 return(0); 110 } 111 112 /* 113 * Used by hammer_scan_inode_snapshots() to locate all of an object's 114 * snapshots. Note that the asof field is not tested, which we can get 115 * away with because it is the lowest-priority field. 116 */ 117 static int 118 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data) 119 { 120 hammer_inode_info_t info = data; 121 122 if (ip->obj_localization > info->obj_localization) 123 return(1); 124 if (ip->obj_localization < info->obj_localization) 125 return(-1); 126 if (ip->obj_id > info->obj_id) 127 return(1); 128 if (ip->obj_id < info->obj_id) 129 return(-1); 130 return(0); 131 } 132 133 /* 134 * Used by hammer_unload_pseudofs() to locate all inodes associated with 135 * a particular PFS. 136 */ 137 static int 138 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data) 139 { 140 uint32_t localization = *(uint32_t *)data; 141 if (ip->obj_localization > localization) 142 return(1); 143 if (ip->obj_localization < localization) 144 return(-1); 145 return(0); 146 } 147 148 /* 149 * RB-Tree support for pseudofs structures 150 */ 151 static int 152 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2) 153 { 154 if (p1->localization < p2->localization) 155 return(-1); 156 if (p1->localization > p2->localization) 157 return(1); 158 return(0); 159 } 160 161 162 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare); 163 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node, 164 hammer_inode_info_cmp, hammer_inode_info_t); 165 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node, 166 hammer_pfs_rb_compare, uint32_t, localization); 167 168 /* 169 * The kernel is not actively referencing this vnode but is still holding 170 * it cached. 171 * 172 * This is called from the frontend. 173 * 174 * MPALMOSTSAFE 175 */ 176 int 177 hammer_vop_inactive(struct vop_inactive_args *ap) 178 { 179 struct hammer_inode *ip = VTOI(ap->a_vp); 180 hammer_mount_t hmp; 181 182 /* 183 * Degenerate case 184 */ 185 if (ip == NULL) { 186 vrecycle(ap->a_vp); 187 return(0); 188 } 189 190 /* 191 * If the inode no longer has visibility in the filesystem try to 192 * recycle it immediately, even if the inode is dirty. Recycling 193 * it quickly allows the system to reclaim buffer cache and VM 194 * resources which can matter a lot in a heavily loaded system. 195 * 196 * This can deadlock in vfsync() if we aren't careful. 197 * 198 * Do not queue the inode to the flusher if we still have visibility, 199 * otherwise namespace calls such as chmod will unnecessarily generate 200 * multiple inode updates. 201 */ 202 if (ip->ino_data.nlinks == 0) { 203 hmp = ip->hmp; 204 lwkt_gettoken(&hmp->fs_token); 205 hammer_inode_unloadable_check(ip, 0); 206 if (ip->flags & HAMMER_INODE_MODMASK) 207 hammer_flush_inode(ip, 0); 208 lwkt_reltoken(&hmp->fs_token); 209 vrecycle(ap->a_vp); 210 } 211 return(0); 212 } 213 214 /* 215 * Release the vnode association. This is typically (but not always) 216 * the last reference on the inode. 217 * 218 * Once the association is lost we are on our own with regards to 219 * flushing the inode. 220 * 221 * We must interlock ip->vp so hammer_get_vnode() can avoid races. 222 */ 223 int 224 hammer_vop_reclaim(struct vop_reclaim_args *ap) 225 { 226 struct hammer_inode *ip; 227 hammer_mount_t hmp; 228 struct vnode *vp; 229 230 vp = ap->a_vp; 231 232 if ((ip = vp->v_data) != NULL) { 233 hmp = ip->hmp; 234 lwkt_gettoken(&hmp->fs_token); 235 hammer_lock_ex(&ip->lock); 236 vp->v_data = NULL; 237 ip->vp = NULL; 238 239 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { 240 ++hammer_count_reclaims; 241 ++hmp->count_reclaims; 242 ip->flags |= HAMMER_INODE_RECLAIM; 243 } 244 hammer_unlock(&ip->lock); 245 vclrisdirty(vp); 246 hammer_rel_inode(ip, 1); 247 lwkt_reltoken(&hmp->fs_token); 248 } 249 return(0); 250 } 251 252 /* 253 * Inform the kernel that the inode is dirty. This will be checked 254 * by vn_unlock(). 255 * 256 * Theoretically in order to reclaim a vnode the hammer_vop_reclaim() 257 * must be called which will interlock against our inode lock, so 258 * if VRECLAIMED is not set vp->v_mount (as used by vsetisdirty()) 259 * should be stable without having to acquire any new locks. 260 */ 261 void 262 hammer_inode_dirty(struct hammer_inode *ip) 263 { 264 struct vnode *vp; 265 266 if ((ip->flags & HAMMER_INODE_MODMASK) && 267 (vp = ip->vp) != NULL && 268 (vp->v_flag & (VRECLAIMED | VISDIRTY)) == 0) { 269 vsetisdirty(vp); 270 } 271 } 272 273 /* 274 * Return a locked vnode for the specified inode. The inode must be 275 * referenced but NOT LOCKED on entry and will remain referenced on 276 * return. 277 * 278 * Called from the frontend. 279 */ 280 int 281 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) 282 { 283 hammer_mount_t hmp; 284 struct vnode *vp; 285 int error = 0; 286 uint8_t obj_type; 287 288 hmp = ip->hmp; 289 290 for (;;) { 291 if ((vp = ip->vp) == NULL) { 292 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); 293 if (error) 294 break; 295 hammer_lock_ex(&ip->lock); 296 if (ip->vp != NULL) { 297 hammer_unlock(&ip->lock); 298 vp = *vpp; 299 vp->v_type = VBAD; 300 vx_put(vp); 301 continue; 302 } 303 hammer_ref(&ip->lock); 304 vp = *vpp; 305 ip->vp = vp; 306 307 obj_type = ip->ino_data.obj_type; 308 vp->v_type = hammer_get_vnode_type(obj_type); 309 310 hammer_inode_wakereclaims(ip); 311 312 switch(ip->ino_data.obj_type) { 313 case HAMMER_OBJTYPE_CDEV: 314 case HAMMER_OBJTYPE_BDEV: 315 vp->v_ops = &hmp->mp->mnt_vn_spec_ops; 316 addaliasu(vp, ip->ino_data.rmajor, 317 ip->ino_data.rminor); 318 break; 319 case HAMMER_OBJTYPE_FIFO: 320 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops; 321 break; 322 case HAMMER_OBJTYPE_REGFILE: 323 break; 324 default: 325 break; 326 } 327 328 /* 329 * Only mark as the root vnode if the ip is not 330 * historical, otherwise the VFS cache will get 331 * confused. The other half of the special handling 332 * is in hammer_vop_nlookupdotdot(). 333 * 334 * Pseudo-filesystem roots can be accessed via 335 * non-root filesystem paths and setting VROOT may 336 * confuse the namecache. Set VPFSROOT instead. 337 */ 338 if (ip->obj_id == HAMMER_OBJID_ROOT) { 339 if (ip->obj_asof == hmp->asof) { 340 if (ip->obj_localization == 0) 341 vsetflags(vp, VROOT); 342 else 343 vsetflags(vp, VPFSROOT); 344 } else { 345 vsetflags(vp, VPFSROOT); 346 } 347 } 348 349 vp->v_data = (void *)ip; 350 /* vnode locked by getnewvnode() */ 351 /* make related vnode dirty if inode dirty? */ 352 hammer_unlock(&ip->lock); 353 if (vp->v_type == VREG) { 354 vinitvmio(vp, ip->ino_data.size, 355 hammer_blocksize(ip->ino_data.size), 356 hammer_blockoff(ip->ino_data.size)); 357 } 358 break; 359 } 360 361 /* 362 * Interlock vnode clearing. This does not prevent the 363 * vnode from going into a reclaimed state but it does 364 * prevent it from being destroyed or reused so the vget() 365 * will properly fail. 366 */ 367 hammer_lock_ex(&ip->lock); 368 if ((vp = ip->vp) == NULL) { 369 hammer_unlock(&ip->lock); 370 continue; 371 } 372 vhold(vp); 373 hammer_unlock(&ip->lock); 374 375 /* 376 * loop if the vget fails (aka races), or if the vp 377 * no longer matches ip->vp. 378 */ 379 if (vget(vp, LK_EXCLUSIVE) == 0) { 380 if (vp == ip->vp) { 381 vdrop(vp); 382 break; 383 } 384 vput(vp); 385 } 386 vdrop(vp); 387 } 388 *vpp = vp; 389 return(error); 390 } 391 392 /* 393 * Locate all copies of the inode for obj_id compatible with the specified 394 * asof, reference, and issue the related call-back. This routine is used 395 * for direct-io invalidation and does not create any new inodes. 396 */ 397 void 398 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo, 399 int (*callback)(hammer_inode_t ip, void *data), 400 void *data) 401 { 402 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root, 403 hammer_inode_info_cmp_all_history, 404 callback, iinfo); 405 } 406 407 /* 408 * Acquire a HAMMER inode. The returned inode is not locked. These functions 409 * do not attach or detach the related vnode (use hammer_get_vnode() for 410 * that). 411 * 412 * The flags argument is only applied for newly created inodes, and only 413 * certain flags are inherited. 414 * 415 * Called from the frontend. 416 */ 417 struct hammer_inode * 418 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, 419 int64_t obj_id, hammer_tid_t asof, uint32_t localization, 420 int flags, int *errorp) 421 { 422 hammer_mount_t hmp = trans->hmp; 423 struct hammer_node_cache *cachep; 424 struct hammer_cursor cursor; 425 struct hammer_inode *ip; 426 427 428 /* 429 * Determine if we already have an inode cached. If we do then 430 * we are golden. 431 * 432 * If we find an inode with no vnode we have to mark the 433 * transaction such that hammer_inode_waitreclaims() is 434 * called later on to avoid building up an infinite number 435 * of inodes. Otherwise we can continue to * add new inodes 436 * faster then they can be disposed of, even with the tsleep 437 * delay. 438 * 439 * If we find a dummy inode we return a failure so dounlink 440 * (which does another lookup) doesn't try to mess with the 441 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode() 442 * to ref dummy inodes. 443 */ 444 loop: 445 *errorp = 0; 446 ip = __hammer_find_inode(trans, obj_id, asof, localization); 447 if (ip) { 448 if (ip->flags & HAMMER_INODE_DUMMY) { 449 *errorp = ENOENT; 450 return(NULL); 451 } 452 hammer_ref(&ip->lock); 453 return(ip); 454 } 455 456 /* 457 * Allocate a new inode structure and deal with races later. 458 */ 459 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 460 ++hammer_count_inodes; 461 ++hmp->count_inodes; 462 ip->obj_id = obj_id; 463 ip->obj_asof = asof; 464 ip->obj_localization = localization; 465 ip->hmp = hmp; 466 ip->flags = flags & HAMMER_INODE_RO; 467 ip->cache[0].ip = ip; 468 ip->cache[1].ip = ip; 469 ip->cache[2].ip = ip; 470 ip->cache[3].ip = ip; 471 if (hmp->ronly) 472 ip->flags |= HAMMER_INODE_RO; 473 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 474 0x7FFFFFFFFFFFFFFFLL; 475 RB_INIT(&ip->rec_tree); 476 TAILQ_INIT(&ip->target_list); 477 hammer_ref(&ip->lock); 478 479 /* 480 * Locate the on-disk inode. If this is a PFS root we always 481 * access the current version of the root inode and (if it is not 482 * a master) always access information under it with a snapshot 483 * TID. 484 * 485 * We cache recent inode lookups in this directory in dip->cache[2]. 486 * If we can't find it we assume the inode we are looking for is 487 * close to the directory inode. 488 */ 489 retry: 490 cachep = NULL; 491 if (dip) { 492 if (dip->cache[2].node) 493 cachep = &dip->cache[2]; 494 else 495 cachep = &dip->cache[0]; 496 } 497 hammer_init_cursor(trans, &cursor, cachep, NULL); 498 cursor.key_beg.localization = localization | HAMMER_LOCALIZE_INODE; 499 cursor.key_beg.obj_id = ip->obj_id; 500 cursor.key_beg.key = 0; 501 cursor.key_beg.create_tid = 0; 502 cursor.key_beg.delete_tid = 0; 503 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 504 cursor.key_beg.obj_type = 0; 505 506 cursor.asof = asof; 507 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 508 HAMMER_CURSOR_ASOF; 509 510 *errorp = hammer_btree_lookup(&cursor); 511 if (*errorp == EDEADLK) { 512 hammer_done_cursor(&cursor); 513 goto retry; 514 } 515 516 /* 517 * On success the B-Tree lookup will hold the appropriate 518 * buffer cache buffers and provide a pointer to the requested 519 * information. Copy the information to the in-memory inode 520 * and cache the B-Tree node to improve future operations. 521 */ 522 if (*errorp == 0) { 523 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 524 ip->ino_data = cursor.data->inode; 525 526 /* 527 * cache[0] tries to cache the location of the object inode. 528 * The assumption is that it is near the directory inode. 529 * 530 * cache[1] tries to cache the location of the object data. 531 * We might have something in the governing directory from 532 * scan optimizations (see the strategy code in 533 * hammer_vnops.c). 534 * 535 * We update dip->cache[2], if possible, with the location 536 * of the object inode for future directory shortcuts. 537 */ 538 hammer_cache_node(&ip->cache[0], cursor.node); 539 if (dip) { 540 if (dip->cache[3].node) { 541 hammer_cache_node(&ip->cache[1], 542 dip->cache[3].node); 543 } 544 hammer_cache_node(&dip->cache[2], cursor.node); 545 } 546 547 /* 548 * The file should not contain any data past the file size 549 * stored in the inode. Setting save_trunc_off to the 550 * file size instead of max reduces B-Tree lookup overheads 551 * on append by allowing the flusher to avoid checking for 552 * record overwrites. 553 */ 554 ip->save_trunc_off = ip->ino_data.size; 555 556 /* 557 * Locate and assign the pseudofs management structure to 558 * the inode. 559 */ 560 if (dip && dip->obj_localization == ip->obj_localization) { 561 ip->pfsm = dip->pfsm; 562 hammer_ref(&ip->pfsm->lock); 563 } else { 564 ip->pfsm = hammer_load_pseudofs(trans, 565 ip->obj_localization, 566 errorp); 567 *errorp = 0; /* ignore ENOENT */ 568 } 569 } 570 571 /* 572 * The inode is placed on the red-black tree and will be synced to 573 * the media when flushed or by the filesystem sync. If this races 574 * another instantiation/lookup the insertion will fail. 575 */ 576 if (*errorp == 0) { 577 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 578 hammer_free_inode(ip); 579 hammer_done_cursor(&cursor); 580 goto loop; 581 } 582 ip->flags |= HAMMER_INODE_ONDISK; 583 } else { 584 if (ip->flags & HAMMER_INODE_RSV_INODES) { 585 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 586 --hmp->rsv_inodes; 587 } 588 589 hammer_free_inode(ip); 590 ip = NULL; 591 } 592 hammer_done_cursor(&cursor); 593 594 /* 595 * NEWINODE is only set if the inode becomes dirty later, 596 * setting it here just leads to unnecessary stalls. 597 * 598 * trans->flags |= HAMMER_TRANSF_NEWINODE; 599 */ 600 return (ip); 601 } 602 603 /* 604 * Get a dummy inode to placemark a broken directory entry. 605 */ 606 struct hammer_inode * 607 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip, 608 int64_t obj_id, hammer_tid_t asof, uint32_t localization, 609 int flags, int *errorp) 610 { 611 hammer_mount_t hmp = trans->hmp; 612 struct hammer_inode *ip; 613 614 /* 615 * Determine if we already have an inode cached. If we do then 616 * we are golden. 617 * 618 * If we find an inode with no vnode we have to mark the 619 * transaction such that hammer_inode_waitreclaims() is 620 * called later on to avoid building up an infinite number 621 * of inodes. Otherwise we can continue to * add new inodes 622 * faster then they can be disposed of, even with the tsleep 623 * delay. 624 * 625 * If we find a non-fake inode we return an error. Only fake 626 * inodes can be returned by this routine. 627 */ 628 loop: 629 *errorp = 0; 630 ip = __hammer_find_inode(trans, obj_id, asof, localization); 631 if (ip) { 632 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) { 633 *errorp = ENOENT; 634 return(NULL); 635 } 636 hammer_ref(&ip->lock); 637 return(ip); 638 } 639 640 /* 641 * Allocate a new inode structure and deal with races later. 642 */ 643 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 644 ++hammer_count_inodes; 645 ++hmp->count_inodes; 646 ip->obj_id = obj_id; 647 ip->obj_asof = asof; 648 ip->obj_localization = localization; 649 ip->hmp = hmp; 650 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY; 651 ip->cache[0].ip = ip; 652 ip->cache[1].ip = ip; 653 ip->cache[2].ip = ip; 654 ip->cache[3].ip = ip; 655 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 656 0x7FFFFFFFFFFFFFFFLL; 657 RB_INIT(&ip->rec_tree); 658 TAILQ_INIT(&ip->target_list); 659 hammer_ref(&ip->lock); 660 661 /* 662 * Populate the dummy inode. Leave everything zero'd out. 663 * 664 * (ip->ino_leaf and ip->ino_data) 665 * 666 * Make the dummy inode a FIFO object which most copy programs 667 * will properly ignore. 668 */ 669 ip->save_trunc_off = ip->ino_data.size; 670 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO; 671 672 /* 673 * Locate and assign the pseudofs management structure to 674 * the inode. 675 */ 676 if (dip && dip->obj_localization == ip->obj_localization) { 677 ip->pfsm = dip->pfsm; 678 hammer_ref(&ip->pfsm->lock); 679 } else { 680 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization, 681 errorp); 682 *errorp = 0; /* ignore ENOENT */ 683 } 684 685 /* 686 * The inode is placed on the red-black tree and will be synced to 687 * the media when flushed or by the filesystem sync. If this races 688 * another instantiation/lookup the insertion will fail. 689 * 690 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake. 691 */ 692 if (*errorp == 0) { 693 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 694 hammer_free_inode(ip); 695 goto loop; 696 } 697 } else { 698 if (ip->flags & HAMMER_INODE_RSV_INODES) { 699 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 700 --hmp->rsv_inodes; 701 } 702 hammer_free_inode(ip); 703 ip = NULL; 704 } 705 trans->flags |= HAMMER_TRANSF_NEWINODE; 706 return (ip); 707 } 708 709 /* 710 * Return a referenced inode only if it is in our inode cache. 711 * Dummy inodes do not count. 712 */ 713 struct hammer_inode * 714 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 715 hammer_tid_t asof, uint32_t localization) 716 { 717 struct hammer_inode *ip; 718 719 ip = __hammer_find_inode(trans, obj_id, asof, localization); 720 if (ip) { 721 if (ip->flags & HAMMER_INODE_DUMMY) 722 ip = NULL; 723 else 724 hammer_ref(&ip->lock); 725 } 726 return(ip); 727 } 728 729 /* 730 * Return a referenced inode only if it is in our inode cache. 731 * This function does not reference inode. 732 */ 733 static struct hammer_inode * 734 __hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 735 hammer_tid_t asof, uint32_t localization) 736 { 737 hammer_mount_t hmp = trans->hmp; 738 struct hammer_inode_info iinfo; 739 struct hammer_inode *ip; 740 741 iinfo.obj_id = obj_id; 742 iinfo.obj_asof = asof; 743 iinfo.obj_localization = localization; 744 745 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 746 747 return(ip); 748 } 749 750 /* 751 * Create a new filesystem object, returning the inode in *ipp. The 752 * returned inode will be referenced. The inode is created in-memory. 753 * 754 * If pfsm is non-NULL the caller wishes to create the root inode for 755 * a master PFS. 756 */ 757 int 758 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 759 struct ucred *cred, 760 hammer_inode_t dip, const char *name, int namelen, 761 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 762 { 763 hammer_mount_t hmp; 764 hammer_inode_t ip; 765 uid_t xuid; 766 int error; 767 int64_t namekey; 768 uint32_t dummy; 769 770 hmp = trans->hmp; 771 772 /* 773 * Disallow the creation of new inodes in directories which 774 * have been deleted. In HAMMER, this will cause a record 775 * syncing assertion later on in the flush code. 776 */ 777 if (dip && dip->ino_data.nlinks == 0) { 778 *ipp = NULL; 779 return (EINVAL); 780 } 781 782 /* 783 * Allocate inode 784 */ 785 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 786 ++hammer_count_inodes; 787 ++hmp->count_inodes; 788 trans->flags |= HAMMER_TRANSF_NEWINODE; 789 790 if (pfsm) { 791 KKASSERT(pfsm->localization != 0); 792 ip->obj_id = HAMMER_OBJID_ROOT; 793 ip->obj_localization = pfsm->localization; 794 } else { 795 KKASSERT(dip != NULL); 796 namekey = hammer_directory_namekey(dip, name, namelen, &dummy); 797 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey); 798 ip->obj_localization = dip->obj_localization; 799 } 800 801 KKASSERT(ip->obj_id != 0); 802 ip->obj_asof = hmp->asof; 803 ip->hmp = hmp; 804 ip->flush_state = HAMMER_FST_IDLE; 805 ip->flags = HAMMER_INODE_DDIRTY | 806 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 807 ip->cache[0].ip = ip; 808 ip->cache[1].ip = ip; 809 ip->cache[2].ip = ip; 810 ip->cache[3].ip = ip; 811 812 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 813 /* ip->save_trunc_off = 0; (already zero) */ 814 RB_INIT(&ip->rec_tree); 815 TAILQ_INIT(&ip->target_list); 816 817 ip->ino_data.atime = trans->time; 818 ip->ino_data.mtime = trans->time; 819 ip->ino_data.size = 0; 820 ip->ino_data.nlinks = 0; 821 822 /* 823 * A nohistory designator on the parent directory is inherited by 824 * the child. We will do this even for pseudo-fs creation... the 825 * sysad can turn it off. 826 */ 827 if (dip) { 828 ip->ino_data.uflags = dip->ino_data.uflags & 829 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 830 } 831 832 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 833 ip->ino_leaf.base.localization = ip->obj_localization | 834 HAMMER_LOCALIZE_INODE; 835 ip->ino_leaf.base.obj_id = ip->obj_id; 836 ip->ino_leaf.base.key = 0; 837 ip->ino_leaf.base.create_tid = 0; 838 ip->ino_leaf.base.delete_tid = 0; 839 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 840 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 841 842 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 843 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 844 ip->ino_data.mode = vap->va_mode; 845 ip->ino_data.ctime = trans->time; 846 847 /* 848 * If we are running version 2 or greater directory entries are 849 * inode-localized instead of data-localized. 850 */ 851 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 852 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 853 ip->ino_data.cap_flags |= 854 HAMMER_INODE_CAP_DIR_LOCAL_INO; 855 } 856 } 857 if (trans->hmp->version >= HAMMER_VOL_VERSION_SIX) { 858 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 859 ip->ino_data.cap_flags |= 860 HAMMER_INODE_CAP_DIRHASH_ALG1; 861 } 862 } 863 864 /* 865 * Setup the ".." pointer. This only needs to be done for directories 866 * but we do it for all objects as a recovery aid if dip exists. 867 * The inode is probably a PFS root if dip is NULL. 868 */ 869 if (dip) 870 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 871 872 switch(ip->ino_leaf.base.obj_type) { 873 case HAMMER_OBJTYPE_CDEV: 874 case HAMMER_OBJTYPE_BDEV: 875 ip->ino_data.rmajor = vap->va_rmajor; 876 ip->ino_data.rminor = vap->va_rminor; 877 break; 878 default: 879 break; 880 } 881 882 /* 883 * Calculate default uid/gid and overwrite with information from 884 * the vap. 885 */ 886 if (dip) { 887 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 888 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 889 xuid, cred, &vap->va_mode); 890 } else { 891 xuid = 0; 892 } 893 ip->ino_data.mode = vap->va_mode; 894 895 if (vap->va_vaflags & VA_UID_UUID_VALID) 896 ip->ino_data.uid = vap->va_uid_uuid; 897 else if (vap->va_uid != (uid_t)VNOVAL) 898 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 899 else 900 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 901 902 if (vap->va_vaflags & VA_GID_UUID_VALID) 903 ip->ino_data.gid = vap->va_gid_uuid; 904 else if (vap->va_gid != (gid_t)VNOVAL) 905 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 906 else if (dip) 907 ip->ino_data.gid = dip->ino_data.gid; 908 909 hammer_ref(&ip->lock); 910 911 if (pfsm) { 912 ip->pfsm = pfsm; 913 hammer_ref(&pfsm->lock); 914 error = 0; 915 } else if (dip->obj_localization == ip->obj_localization) { 916 ip->pfsm = dip->pfsm; 917 hammer_ref(&ip->pfsm->lock); 918 error = 0; 919 } else { 920 ip->pfsm = hammer_load_pseudofs(trans, 921 ip->obj_localization, 922 &error); 923 error = 0; /* ignore ENOENT */ 924 } 925 926 if (error) { 927 hammer_free_inode(ip); 928 ip = NULL; 929 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 930 hpanic("duplicate obj_id %llx", (long long)ip->obj_id); 931 /* not reached */ 932 hammer_free_inode(ip); 933 } 934 *ipp = ip; 935 return(error); 936 } 937 938 /* 939 * Final cleanup / freeing of an inode structure 940 */ 941 static void 942 hammer_free_inode(hammer_inode_t ip) 943 { 944 struct hammer_mount *hmp; 945 946 hmp = ip->hmp; 947 KKASSERT(hammer_oneref(&ip->lock)); 948 hammer_uncache_node(&ip->cache[0]); 949 hammer_uncache_node(&ip->cache[1]); 950 hammer_uncache_node(&ip->cache[2]); 951 hammer_uncache_node(&ip->cache[3]); 952 hammer_inode_wakereclaims(ip); 953 if (ip->objid_cache) 954 hammer_clear_objid(ip); 955 --hammer_count_inodes; 956 --hmp->count_inodes; 957 if (ip->pfsm) { 958 hammer_rel_pseudofs(hmp, ip->pfsm); 959 ip->pfsm = NULL; 960 } 961 kfree(ip, hmp->m_inodes); 962 } 963 964 /* 965 * Retrieve pseudo-fs data. NULL will never be returned. 966 * 967 * If an error occurs *errorp will be set and a default template is returned, 968 * otherwise *errorp is set to 0. Typically when an error occurs it will 969 * be ENOENT. 970 */ 971 hammer_pseudofs_inmem_t 972 hammer_load_pseudofs(hammer_transaction_t trans, 973 uint32_t localization, int *errorp) 974 { 975 hammer_mount_t hmp = trans->hmp; 976 hammer_inode_t ip; 977 hammer_pseudofs_inmem_t pfsm; 978 struct hammer_cursor cursor; 979 int bytes; 980 981 retry: 982 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 983 if (pfsm) { 984 hammer_ref(&pfsm->lock); 985 *errorp = 0; 986 return(pfsm); 987 } 988 989 /* 990 * PFS records are associated with the root inode (not the PFS root 991 * inode, but the real root). Avoid an infinite recursion if loading 992 * the PFS for the real root. 993 */ 994 if (localization) { 995 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 996 HAMMER_MAX_TID, 997 HAMMER_DEF_LOCALIZATION, 0, errorp); 998 } else { 999 ip = NULL; 1000 } 1001 1002 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 1003 pfsm->localization = localization; 1004 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 1005 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 1006 1007 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 1008 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION | 1009 HAMMER_LOCALIZE_MISC; 1010 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 1011 cursor.key_beg.create_tid = 0; 1012 cursor.key_beg.delete_tid = 0; 1013 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 1014 cursor.key_beg.obj_type = 0; 1015 cursor.key_beg.key = localization; 1016 cursor.asof = HAMMER_MAX_TID; 1017 cursor.flags |= HAMMER_CURSOR_ASOF; 1018 1019 if (ip) 1020 *errorp = hammer_ip_lookup(&cursor); 1021 else 1022 *errorp = hammer_btree_lookup(&cursor); 1023 if (*errorp == 0) { 1024 *errorp = hammer_ip_resolve_data(&cursor); 1025 if (*errorp == 0) { 1026 if (cursor.data->pfsd.mirror_flags & 1027 HAMMER_PFSD_DELETED) { 1028 *errorp = ENOENT; 1029 } else { 1030 bytes = cursor.leaf->data_len; 1031 if (bytes > sizeof(pfsm->pfsd)) 1032 bytes = sizeof(pfsm->pfsd); 1033 bcopy(cursor.data, &pfsm->pfsd, bytes); 1034 } 1035 } 1036 } 1037 hammer_done_cursor(&cursor); 1038 1039 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 1040 hammer_ref(&pfsm->lock); 1041 if (ip) 1042 hammer_rel_inode(ip, 0); 1043 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 1044 kfree(pfsm, hmp->m_misc); 1045 goto retry; 1046 } 1047 return(pfsm); 1048 } 1049 1050 /* 1051 * Store pseudo-fs data. The backend will automatically delete any prior 1052 * on-disk pseudo-fs data but we have to delete in-memory versions. 1053 */ 1054 int 1055 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 1056 { 1057 struct hammer_cursor cursor; 1058 hammer_record_t record; 1059 hammer_inode_t ip; 1060 int error; 1061 1062 /* 1063 * PFS records are associated with the root inode (not the PFS root 1064 * inode, but the real root). 1065 */ 1066 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1067 HAMMER_DEF_LOCALIZATION, 0, &error); 1068 retry: 1069 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 1070 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 1071 cursor.key_beg.localization = ip->obj_localization | 1072 HAMMER_LOCALIZE_MISC; 1073 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 1074 cursor.key_beg.create_tid = 0; 1075 cursor.key_beg.delete_tid = 0; 1076 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 1077 cursor.key_beg.obj_type = 0; 1078 cursor.key_beg.key = pfsm->localization; 1079 cursor.asof = HAMMER_MAX_TID; 1080 cursor.flags |= HAMMER_CURSOR_ASOF; 1081 1082 /* 1083 * Replace any in-memory version of the record. 1084 */ 1085 error = hammer_ip_lookup(&cursor); 1086 if (error == 0 && hammer_cursor_inmem(&cursor)) { 1087 record = cursor.iprec; 1088 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 1089 KKASSERT(cursor.deadlk_rec == NULL); 1090 hammer_ref(&record->lock); 1091 cursor.deadlk_rec = record; 1092 error = EDEADLK; 1093 } else { 1094 record->flags |= HAMMER_RECF_DELETED_FE; 1095 error = 0; 1096 } 1097 } 1098 1099 /* 1100 * Allocate replacement general record. The backend flush will 1101 * delete any on-disk version of the record. 1102 */ 1103 if (error == 0 || error == ENOENT) { 1104 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 1105 record->type = HAMMER_MEM_RECORD_GENERAL; 1106 1107 record->leaf.base.localization = ip->obj_localization | 1108 HAMMER_LOCALIZE_MISC; 1109 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 1110 record->leaf.base.key = pfsm->localization; 1111 record->leaf.data_len = sizeof(pfsm->pfsd); 1112 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 1113 error = hammer_ip_add_record(trans, record); 1114 } 1115 hammer_done_cursor(&cursor); 1116 if (error == EDEADLK) 1117 goto retry; 1118 hammer_rel_inode(ip, 0); 1119 return(error); 1120 } 1121 1122 /* 1123 * Create a root directory for a PFS if one does not alredy exist. 1124 * 1125 * The PFS root stands alone so we must also bump the nlinks count 1126 * to prevent it from being destroyed on release. 1127 */ 1128 int 1129 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 1130 hammer_pseudofs_inmem_t pfsm) 1131 { 1132 hammer_inode_t ip; 1133 struct vattr vap; 1134 int error; 1135 1136 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1137 pfsm->localization, 0, &error); 1138 if (ip == NULL) { 1139 vattr_null(&vap); 1140 vap.va_mode = 0755; 1141 vap.va_type = VDIR; 1142 error = hammer_create_inode(trans, &vap, cred, 1143 NULL, NULL, 0, 1144 pfsm, &ip); 1145 if (error == 0) { 1146 ++ip->ino_data.nlinks; 1147 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); 1148 } 1149 } 1150 if (ip) 1151 hammer_rel_inode(ip, 0); 1152 return(error); 1153 } 1154 1155 /* 1156 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 1157 * if we are unable to disassociate all the inodes. 1158 */ 1159 static 1160 int 1161 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 1162 { 1163 int res; 1164 1165 hammer_ref(&ip->lock); 1166 if (ip->vp && (ip->vp->v_flag & VPFSROOT)) { 1167 /* 1168 * The hammer pfs-upgrade directive itself might have the 1169 * root of the pfs open. Just allow it. 1170 */ 1171 res = 0; 1172 } else { 1173 /* 1174 * Don't allow any subdirectories or files to be open. 1175 */ 1176 if (hammer_isactive(&ip->lock) == 2 && ip->vp) 1177 vclean_unlocked(ip->vp); 1178 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL) 1179 res = 0; 1180 else 1181 res = -1; /* stop, someone is using the inode */ 1182 } 1183 hammer_rel_inode(ip, 0); 1184 return(res); 1185 } 1186 1187 int 1188 hammer_unload_pseudofs(hammer_transaction_t trans, uint32_t localization) 1189 { 1190 int res; 1191 int try; 1192 1193 for (try = res = 0; try < 4; ++try) { 1194 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 1195 hammer_inode_pfs_cmp, 1196 hammer_unload_pseudofs_callback, 1197 &localization); 1198 if (res == 0 && try > 1) 1199 break; 1200 hammer_flusher_sync(trans->hmp); 1201 } 1202 if (res != 0) 1203 res = ENOTEMPTY; 1204 return(res); 1205 } 1206 1207 1208 /* 1209 * Release a reference on a PFS 1210 */ 1211 void 1212 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 1213 { 1214 hammer_rel(&pfsm->lock); 1215 if (hammer_norefs(&pfsm->lock)) { 1216 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 1217 kfree(pfsm, hmp->m_misc); 1218 } 1219 } 1220 1221 /* 1222 * Called by hammer_sync_inode(). 1223 */ 1224 static int 1225 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 1226 { 1227 hammer_transaction_t trans = cursor->trans; 1228 hammer_record_t record; 1229 int error; 1230 int redirty; 1231 1232 retry: 1233 error = 0; 1234 1235 /* 1236 * If the inode has a presence on-disk then locate it and mark 1237 * it deleted, setting DELONDISK. 1238 * 1239 * The record may or may not be physically deleted, depending on 1240 * the retention policy. 1241 */ 1242 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 1243 HAMMER_INODE_ONDISK) { 1244 hammer_normalize_cursor(cursor); 1245 cursor->key_beg.localization = ip->obj_localization | 1246 HAMMER_LOCALIZE_INODE; 1247 cursor->key_beg.obj_id = ip->obj_id; 1248 cursor->key_beg.key = 0; 1249 cursor->key_beg.create_tid = 0; 1250 cursor->key_beg.delete_tid = 0; 1251 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1252 cursor->key_beg.obj_type = 0; 1253 cursor->asof = ip->obj_asof; 1254 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1255 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 1256 cursor->flags |= HAMMER_CURSOR_BACKEND; 1257 1258 error = hammer_btree_lookup(cursor); 1259 if (hammer_debug_inode) 1260 hdkprintf("IPDEL %p %08x %d", ip, ip->flags, error); 1261 1262 if (error == 0) { 1263 error = hammer_ip_delete_record(cursor, ip, trans->tid); 1264 if (hammer_debug_inode) 1265 hdkprintf("error %d\n", error); 1266 if (error == 0) { 1267 ip->flags |= HAMMER_INODE_DELONDISK; 1268 } 1269 if (cursor->node) 1270 hammer_cache_node(&ip->cache[0], cursor->node); 1271 } 1272 if (error == EDEADLK) { 1273 hammer_done_cursor(cursor); 1274 error = hammer_init_cursor(trans, cursor, 1275 &ip->cache[0], ip); 1276 if (hammer_debug_inode) 1277 hdkprintf("IPDED %p %d\n", ip, error); 1278 if (error == 0) 1279 goto retry; 1280 } 1281 } 1282 1283 /* 1284 * Ok, write out the initial record or a new record (after deleting 1285 * the old one), unless the DELETED flag is set. This routine will 1286 * clear DELONDISK if it writes out a record. 1287 * 1288 * Update our inode statistics if this is the first application of 1289 * the inode on-disk. 1290 */ 1291 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 1292 /* 1293 * Generate a record and write it to the media. We clean-up 1294 * the state before releasing so we do not have to set-up 1295 * a flush_group. 1296 */ 1297 record = hammer_alloc_mem_record(ip, 0); 1298 record->type = HAMMER_MEM_RECORD_INODE; 1299 record->flush_state = HAMMER_FST_FLUSH; 1300 record->leaf = ip->sync_ino_leaf; 1301 record->leaf.base.create_tid = trans->tid; 1302 record->leaf.data_len = sizeof(ip->sync_ino_data); 1303 record->leaf.create_ts = trans->time32; 1304 record->data = (void *)&ip->sync_ino_data; 1305 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1306 1307 /* 1308 * If this flag is set we cannot sync the new file size 1309 * because we haven't finished related truncations. The 1310 * inode will be flushed in another flush group to finish 1311 * the job. 1312 */ 1313 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1314 ip->sync_ino_data.size != ip->ino_data.size) { 1315 redirty = 1; 1316 ip->sync_ino_data.size = ip->ino_data.size; 1317 } else { 1318 redirty = 0; 1319 } 1320 1321 for (;;) { 1322 error = hammer_ip_sync_record_cursor(cursor, record); 1323 if (hammer_debug_inode) 1324 hdkprintf("GENREC %p rec %08x %d\n", 1325 ip, record->flags, error); 1326 if (error != EDEADLK) 1327 break; 1328 hammer_done_cursor(cursor); 1329 error = hammer_init_cursor(trans, cursor, 1330 &ip->cache[0], ip); 1331 if (hammer_debug_inode) 1332 hdkprintf("GENREC reinit %d\n", error); 1333 if (error) 1334 break; 1335 } 1336 1337 /* 1338 * Note: The record was never on the inode's record tree 1339 * so just wave our hands importantly and destroy it. 1340 */ 1341 record->flags |= HAMMER_RECF_COMMITTED; 1342 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1343 record->flush_state = HAMMER_FST_IDLE; 1344 ++ip->rec_generation; 1345 hammer_rel_mem_record(record); 1346 1347 /* 1348 * Finish up. 1349 */ 1350 if (error == 0) { 1351 if (hammer_debug_inode) 1352 hdkprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1353 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1354 HAMMER_INODE_SDIRTY | 1355 HAMMER_INODE_ATIME | 1356 HAMMER_INODE_MTIME); 1357 ip->flags &= ~HAMMER_INODE_DELONDISK; 1358 if (redirty) 1359 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1360 1361 /* 1362 * Root volume count of inodes 1363 */ 1364 hammer_sync_lock_sh(trans); 1365 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1366 hammer_modify_volume_field(trans, 1367 trans->rootvol, 1368 vol0_stat_inodes); 1369 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1370 hammer_modify_volume_done(trans->rootvol); 1371 ip->flags |= HAMMER_INODE_ONDISK; 1372 if (hammer_debug_inode) 1373 hdkprintf("NOWONDISK %p\n", ip); 1374 } 1375 hammer_sync_unlock(trans); 1376 } 1377 } 1378 1379 /* 1380 * If the inode has been destroyed, clean out any left-over flags 1381 * that may have been set by the frontend. 1382 */ 1383 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1384 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1385 HAMMER_INODE_SDIRTY | 1386 HAMMER_INODE_ATIME | 1387 HAMMER_INODE_MTIME); 1388 } 1389 return(error); 1390 } 1391 1392 /* 1393 * Update only the itimes fields. 1394 * 1395 * ATIME can be updated without generating any UNDO. MTIME is updated 1396 * with UNDO so it is guaranteed to be synchronized properly in case of 1397 * a crash. 1398 * 1399 * Neither field is included in the B-Tree leaf element's CRC, which is how 1400 * we can get away with updating ATIME the way we do. 1401 */ 1402 static int 1403 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1404 { 1405 hammer_transaction_t trans = cursor->trans; 1406 int error; 1407 1408 retry: 1409 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1410 HAMMER_INODE_ONDISK) { 1411 return(0); 1412 } 1413 1414 hammer_normalize_cursor(cursor); 1415 cursor->key_beg.localization = ip->obj_localization | 1416 HAMMER_LOCALIZE_INODE; 1417 cursor->key_beg.obj_id = ip->obj_id; 1418 cursor->key_beg.key = 0; 1419 cursor->key_beg.create_tid = 0; 1420 cursor->key_beg.delete_tid = 0; 1421 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1422 cursor->key_beg.obj_type = 0; 1423 cursor->asof = ip->obj_asof; 1424 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1425 cursor->flags |= HAMMER_CURSOR_ASOF; 1426 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1427 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1428 cursor->flags |= HAMMER_CURSOR_BACKEND; 1429 1430 error = hammer_btree_lookup(cursor); 1431 if (error == 0) { 1432 hammer_cache_node(&ip->cache[0], cursor->node); 1433 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1434 /* 1435 * Updating MTIME requires an UNDO. Just cover 1436 * both atime and mtime. 1437 */ 1438 hammer_sync_lock_sh(trans); 1439 hammer_modify_buffer(trans, cursor->data_buffer, 1440 &cursor->data->inode.mtime, 1441 sizeof(cursor->data->inode.atime) + 1442 sizeof(cursor->data->inode.mtime)); 1443 cursor->data->inode.atime = ip->sync_ino_data.atime; 1444 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1445 hammer_modify_buffer_done(cursor->data_buffer); 1446 hammer_sync_unlock(trans); 1447 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1448 /* 1449 * Updating atime only can be done in-place with 1450 * no UNDO. 1451 */ 1452 hammer_sync_lock_sh(trans); 1453 hammer_modify_buffer_noundo(trans, cursor->data_buffer); 1454 cursor->data->inode.atime = ip->sync_ino_data.atime; 1455 hammer_modify_buffer_done(cursor->data_buffer); 1456 hammer_sync_unlock(trans); 1457 } 1458 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1459 } 1460 if (error == EDEADLK) { 1461 hammer_done_cursor(cursor); 1462 error = hammer_init_cursor(trans, cursor, &ip->cache[0], ip); 1463 if (error == 0) 1464 goto retry; 1465 } 1466 return(error); 1467 } 1468 1469 /* 1470 * Release a reference on an inode, flush as requested. 1471 * 1472 * On the last reference we queue the inode to the flusher for its final 1473 * disposition. 1474 */ 1475 void 1476 hammer_rel_inode(struct hammer_inode *ip, int flush) 1477 { 1478 /* 1479 * Handle disposition when dropping the last ref. 1480 */ 1481 for (;;) { 1482 if (hammer_oneref(&ip->lock)) { 1483 /* 1484 * Determine whether on-disk action is needed for 1485 * the inode's final disposition. 1486 */ 1487 KKASSERT(ip->vp == NULL); 1488 hammer_inode_unloadable_check(ip, 0); 1489 if (ip->flags & HAMMER_INODE_MODMASK) { 1490 hammer_flush_inode(ip, 0); 1491 } else if (hammer_oneref(&ip->lock)) { 1492 hammer_unload_inode(ip); 1493 break; 1494 } 1495 } else { 1496 if (flush) 1497 hammer_flush_inode(ip, 0); 1498 1499 /* 1500 * The inode still has multiple refs, try to drop 1501 * one ref. 1502 */ 1503 KKASSERT(hammer_isactive(&ip->lock) >= 1); 1504 if (hammer_isactive(&ip->lock) > 1) { 1505 hammer_rel(&ip->lock); 1506 break; 1507 } 1508 } 1509 } 1510 } 1511 1512 /* 1513 * Unload and destroy the specified inode. Must be called with one remaining 1514 * reference. The reference is disposed of. 1515 * 1516 * The inode must be completely clean. 1517 */ 1518 static int 1519 hammer_unload_inode(struct hammer_inode *ip) 1520 { 1521 hammer_mount_t hmp = ip->hmp; 1522 1523 KASSERT(hammer_oneref(&ip->lock), 1524 ("hammer_unload_inode: %d refs", hammer_isactive(&ip->lock))); 1525 KKASSERT(ip->vp == NULL); 1526 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1527 KKASSERT(ip->cursor_ip_refs == 0); 1528 KKASSERT(hammer_notlocked(&ip->lock)); 1529 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1530 1531 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1532 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1533 1534 if (ip->flags & HAMMER_INODE_RDIRTY) { 1535 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip); 1536 ip->flags &= ~HAMMER_INODE_RDIRTY; 1537 } 1538 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1539 1540 hammer_free_inode(ip); 1541 return(0); 1542 } 1543 1544 /* 1545 * Called during unmounting if a critical error occured. The in-memory 1546 * inode and all related structures are destroyed. 1547 * 1548 * If a critical error did not occur the unmount code calls the standard 1549 * release and asserts that the inode is gone. 1550 */ 1551 int 1552 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1553 { 1554 hammer_record_t rec; 1555 1556 /* 1557 * Get rid of the inodes in-memory records, regardless of their 1558 * state, and clear the mod-mask. 1559 */ 1560 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1561 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1562 rec->target_ip = NULL; 1563 if (rec->flush_state == HAMMER_FST_SETUP) 1564 rec->flush_state = HAMMER_FST_IDLE; 1565 } 1566 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1567 if (rec->flush_state == HAMMER_FST_FLUSH) 1568 --rec->flush_group->refs; 1569 else 1570 hammer_ref(&rec->lock); 1571 KKASSERT(hammer_oneref(&rec->lock)); 1572 rec->flush_state = HAMMER_FST_IDLE; 1573 rec->flush_group = NULL; 1574 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */ 1575 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */ 1576 ++ip->rec_generation; 1577 hammer_rel_mem_record(rec); 1578 } 1579 ip->flags &= ~HAMMER_INODE_MODMASK; 1580 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1581 KKASSERT(ip->vp == NULL); 1582 1583 /* 1584 * Remove the inode from any flush group, force it idle. FLUSH 1585 * and SETUP states have an inode ref. 1586 */ 1587 switch(ip->flush_state) { 1588 case HAMMER_FST_FLUSH: 1589 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 1590 --ip->flush_group->refs; 1591 ip->flush_group = NULL; 1592 /* fall through */ 1593 case HAMMER_FST_SETUP: 1594 hammer_rel(&ip->lock); 1595 ip->flush_state = HAMMER_FST_IDLE; 1596 /* fall through */ 1597 case HAMMER_FST_IDLE: 1598 break; 1599 } 1600 1601 /* 1602 * There shouldn't be any associated vnode. The unload needs at 1603 * least one ref, if we do have a vp steal its ip ref. 1604 */ 1605 if (ip->vp) { 1606 hdkprintf("Unexpected vnode association ip %p vp %p\n", 1607 ip, ip->vp); 1608 ip->vp->v_data = NULL; 1609 ip->vp = NULL; 1610 } else { 1611 hammer_ref(&ip->lock); 1612 } 1613 hammer_unload_inode(ip); 1614 return(0); 1615 } 1616 1617 /* 1618 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1619 * the read-only flag for cached inodes. 1620 * 1621 * This routine is called from a RB_SCAN(). 1622 */ 1623 int 1624 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1625 { 1626 hammer_mount_t hmp = ip->hmp; 1627 1628 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1629 ip->flags |= HAMMER_INODE_RO; 1630 else 1631 ip->flags &= ~HAMMER_INODE_RO; 1632 return(0); 1633 } 1634 1635 /* 1636 * A transaction has modified an inode, requiring updates as specified by 1637 * the passed flags. 1638 * 1639 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime, 1640 * and not including size changes due to write-append 1641 * (but other size changes are included). 1642 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to 1643 * write-append. 1644 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1645 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1646 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1647 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1648 */ 1649 void 1650 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags) 1651 { 1652 /* 1653 * ronly of 0 or 2 does not trigger assertion. 1654 * 2 is a special error state 1655 */ 1656 KKASSERT(ip->hmp->ronly != 1 || 1657 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1658 HAMMER_INODE_SDIRTY | 1659 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1660 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1661 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1662 ip->flags |= HAMMER_INODE_RSV_INODES; 1663 ++ip->hmp->rsv_inodes; 1664 } 1665 1666 /* 1667 * Set the NEWINODE flag in the transaction if the inode 1668 * transitions to a dirty state. This is used to track 1669 * the load on the inode cache. 1670 */ 1671 if (trans && 1672 (ip->flags & HAMMER_INODE_MODMASK) == 0 && 1673 (flags & HAMMER_INODE_MODMASK)) { 1674 trans->flags |= HAMMER_TRANSF_NEWINODE; 1675 } 1676 if (flags & HAMMER_INODE_MODMASK) 1677 hammer_inode_dirty(ip); 1678 ip->flags |= flags; 1679 } 1680 1681 /* 1682 * Attempt to quickly update the atime for a hammer inode. Return 0 on 1683 * success, -1 on failure. 1684 * 1685 * We attempt to update the atime with only the ip lock and not the 1686 * whole filesystem lock in order to improve concurrency. We can only 1687 * do this safely if the ATIME flag is already pending on the inode. 1688 * 1689 * This function is called via a vnops path (ip pointer is stable) without 1690 * fs_token held. 1691 */ 1692 int 1693 hammer_update_atime_quick(hammer_inode_t ip) 1694 { 1695 struct timeval tv; 1696 int res = -1; 1697 1698 if ((ip->flags & HAMMER_INODE_RO) || 1699 (ip->hmp->mp->mnt_flag & MNT_NOATIME)) { 1700 /* 1701 * Silently indicate success on read-only mount/snap 1702 */ 1703 res = 0; 1704 } else if (ip->flags & HAMMER_INODE_ATIME) { 1705 /* 1706 * Double check with inode lock held against backend. This 1707 * is only safe if all we need to do is update 1708 * ino_data.atime. 1709 */ 1710 getmicrotime(&tv); 1711 hammer_lock_ex(&ip->lock); 1712 if (ip->flags & HAMMER_INODE_ATIME) { 1713 ip->ino_data.atime = 1714 (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec; 1715 res = 0; 1716 } 1717 hammer_unlock(&ip->lock); 1718 } 1719 return res; 1720 } 1721 1722 /* 1723 * Request that an inode be flushed. This whole mess cannot block and may 1724 * recurse (if not synchronous). Once requested HAMMER will attempt to 1725 * actively flush the inode until the flush can be done. 1726 * 1727 * The inode may already be flushing, or may be in a setup state. We can 1728 * place the inode in a flushing state if it is currently idle and flag it 1729 * to reflush if it is currently flushing. 1730 * 1731 * Upon return if the inode could not be flushed due to a setup 1732 * dependancy, then it will be automatically flushed when the dependancy 1733 * is satisfied. 1734 */ 1735 void 1736 hammer_flush_inode(hammer_inode_t ip, int flags) 1737 { 1738 hammer_mount_t hmp; 1739 hammer_flush_group_t flg; 1740 int good; 1741 1742 /* 1743 * fill_flush_group is the first flush group we may be able to 1744 * continue filling, it may be open or closed but it will always 1745 * be past the currently flushing (running) flg. 1746 * 1747 * next_flush_group is the next open flush group. 1748 */ 1749 hmp = ip->hmp; 1750 while ((flg = hmp->fill_flush_group) != NULL) { 1751 KKASSERT(flg->running == 0); 1752 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit && 1753 flg->total_count <= hammer_autoflush) { 1754 break; 1755 } 1756 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry); 1757 hammer_flusher_async(ip->hmp, flg); 1758 } 1759 if (flg == NULL) { 1760 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1761 flg->seq = hmp->flusher.next++; 1762 if (hmp->next_flush_group == NULL) 1763 hmp->next_flush_group = flg; 1764 if (hmp->fill_flush_group == NULL) 1765 hmp->fill_flush_group = flg; 1766 RB_INIT(&flg->flush_tree); 1767 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1768 } 1769 1770 /* 1771 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1772 * state we have to put it back into an IDLE state so we can 1773 * drop the extra ref. 1774 * 1775 * If we have a parent dependancy we must still fall through 1776 * so we can run it. 1777 */ 1778 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1779 if (ip->flush_state == HAMMER_FST_SETUP && 1780 TAILQ_EMPTY(&ip->target_list)) { 1781 ip->flush_state = HAMMER_FST_IDLE; 1782 hammer_rel_inode(ip, 0); 1783 } 1784 if (ip->flush_state == HAMMER_FST_IDLE) 1785 return; 1786 } 1787 1788 /* 1789 * Our flush action will depend on the current state. 1790 */ 1791 switch(ip->flush_state) { 1792 case HAMMER_FST_IDLE: 1793 /* 1794 * We have no dependancies and can flush immediately. Some 1795 * our children may not be flushable so we have to re-test 1796 * with that additional knowledge. 1797 */ 1798 hammer_flush_inode_core(ip, flg, flags); 1799 break; 1800 case HAMMER_FST_SETUP: 1801 /* 1802 * Recurse upwards through dependancies via target_list 1803 * and start their flusher actions going if possible. 1804 * 1805 * 'good' is our connectivity. -1 means we have none and 1806 * can't flush, 0 means there weren't any dependancies, and 1807 * 1 means we have good connectivity. 1808 */ 1809 good = hammer_setup_parent_inodes(ip, 0, flg); 1810 1811 if (good >= 0) { 1812 /* 1813 * We can continue if good >= 0. Determine how 1814 * many records under our inode can be flushed (and 1815 * mark them). 1816 */ 1817 hammer_flush_inode_core(ip, flg, flags); 1818 } else { 1819 /* 1820 * Parent has no connectivity, tell it to flush 1821 * us as soon as it does. 1822 * 1823 * The REFLUSH flag is also needed to trigger 1824 * dependancy wakeups. 1825 */ 1826 ip->flags |= HAMMER_INODE_CONN_DOWN | 1827 HAMMER_INODE_REFLUSH; 1828 if (flags & HAMMER_FLUSH_SIGNAL) { 1829 ip->flags |= HAMMER_INODE_RESIGNAL; 1830 hammer_flusher_async(ip->hmp, flg); 1831 } 1832 } 1833 break; 1834 case HAMMER_FST_FLUSH: 1835 /* 1836 * We are already flushing, flag the inode to reflush 1837 * if needed after it completes its current flush. 1838 * 1839 * The REFLUSH flag is also needed to trigger 1840 * dependancy wakeups. 1841 */ 1842 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1843 ip->flags |= HAMMER_INODE_REFLUSH; 1844 if (flags & HAMMER_FLUSH_SIGNAL) { 1845 ip->flags |= HAMMER_INODE_RESIGNAL; 1846 hammer_flusher_async(ip->hmp, flg); 1847 } 1848 break; 1849 } 1850 } 1851 1852 /* 1853 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1854 * ip which reference our ip. 1855 * 1856 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1857 * so for now do not ref/deref the structures. Note that if we use the 1858 * ref/rel code later, the rel CAN block. 1859 */ 1860 static int 1861 hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 1862 hammer_flush_group_t flg) 1863 { 1864 hammer_record_t depend; 1865 int good; 1866 int r; 1867 1868 /* 1869 * If we hit our recursion limit and we have parent dependencies 1870 * We cannot continue. Returning < 0 will cause us to be flagged 1871 * for reflush. Returning -2 cuts off additional dependency checks 1872 * because they are likely to also hit the depth limit. 1873 * 1874 * We cannot return < 0 if there are no dependencies or there might 1875 * not be anything to wakeup (ip). 1876 */ 1877 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) { 1878 if (hammer_debug_general & 0x10000) 1879 hkrateprintf(&hammer_gen_krate, 1880 "Warning: depth limit reached on " 1881 "setup recursion, inode %p %016llx\n", 1882 ip, (long long)ip->obj_id); 1883 return(-2); 1884 } 1885 1886 /* 1887 * Scan dependencies 1888 */ 1889 good = 0; 1890 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1891 r = hammer_setup_parent_inodes_helper(depend, depth, flg); 1892 KKASSERT(depend->target_ip == ip); 1893 if (r < 0 && good == 0) 1894 good = -1; 1895 if (r > 0) 1896 good = 1; 1897 1898 /* 1899 * If we failed due to the recursion depth limit then stop 1900 * now. 1901 */ 1902 if (r == -2) 1903 break; 1904 } 1905 return(good); 1906 } 1907 1908 /* 1909 * This helper function takes a record representing the dependancy between 1910 * the parent inode and child inode. 1911 * 1912 * record = record in question (*rec in below) 1913 * record->ip = parent inode (*pip in below) 1914 * record->target_ip = child inode (*ip in below) 1915 * 1916 * *pip--------------\ 1917 * ^ \rec_tree 1918 * \ \ 1919 * \ip /\\\\\ rbtree of recs from parent inode's view 1920 * \ //\\\\\\ 1921 * \ / ........ 1922 * \ / 1923 * \------*rec------target_ip------>*ip 1924 * ...target_entry<----...----->target_list<---... 1925 * list of recs from inode's view 1926 * 1927 * We are asked to recurse upwards and convert the record from SETUP 1928 * to FLUSH if possible. 1929 * 1930 * Return 1 if the record gives us connectivity 1931 * 1932 * Return 0 if the record is not relevant 1933 * 1934 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1935 */ 1936 static int 1937 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth, 1938 hammer_flush_group_t flg) 1939 { 1940 hammer_inode_t pip; 1941 int good; 1942 1943 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1944 pip = record->ip; 1945 1946 /* 1947 * If the record is already flushing, is it in our flush group? 1948 * 1949 * If it is in our flush group but it is a general record or a 1950 * delete-on-disk, it does not improve our connectivity (return 0), 1951 * and if the target inode is not trying to destroy itself we can't 1952 * allow the operation yet anyway (the second return -1). 1953 */ 1954 if (record->flush_state == HAMMER_FST_FLUSH) { 1955 /* 1956 * If not in our flush group ask the parent to reflush 1957 * us as soon as possible. 1958 */ 1959 if (record->flush_group != flg) { 1960 pip->flags |= HAMMER_INODE_REFLUSH; 1961 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1962 return(-1); 1963 } 1964 1965 /* 1966 * If in our flush group everything is already set up, 1967 * just return whether the record will improve our 1968 * visibility or not. 1969 */ 1970 if (record->type == HAMMER_MEM_RECORD_ADD) 1971 return(1); 1972 return(0); 1973 } 1974 1975 /* 1976 * It must be a setup record. Try to resolve the setup dependancies 1977 * by recursing upwards so we can place ip on the flush list. 1978 * 1979 * Limit ourselves to 20 levels of recursion to avoid blowing out 1980 * the kernel stack. If we hit the recursion limit we can't flush 1981 * until the parent flushes. The parent will flush independantly 1982 * on its own and ultimately a deep recursion will be resolved. 1983 */ 1984 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1985 1986 good = hammer_setup_parent_inodes(pip, depth + 1, flg); 1987 1988 /* 1989 * If good < 0 the parent has no connectivity and we cannot safely 1990 * flush the directory entry, which also means we can't flush our 1991 * ip. Flag us for downward recursion once the parent's 1992 * connectivity is resolved. Flag the parent for [re]flush or it 1993 * may not check for downward recursions. 1994 */ 1995 if (good < 0) { 1996 pip->flags |= HAMMER_INODE_REFLUSH; 1997 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1998 return(good); 1999 } 2000 2001 /* 2002 * We are go, place the parent inode in a flushing state so we can 2003 * place its record in a flushing state. Note that the parent 2004 * may already be flushing. The record must be in the same flush 2005 * group as the parent. 2006 */ 2007 if (pip->flush_state != HAMMER_FST_FLUSH) 2008 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 2009 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 2010 2011 /* 2012 * It is possible for a rename to create a loop in the recursion 2013 * and revisit a record. This will result in the record being 2014 * placed in a flush state unexpectedly. This check deals with 2015 * the case. 2016 */ 2017 if (record->flush_state == HAMMER_FST_FLUSH) { 2018 if (record->type == HAMMER_MEM_RECORD_ADD) 2019 return(1); 2020 return(0); 2021 } 2022 2023 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 2024 2025 #if 0 2026 if (record->type == HAMMER_MEM_RECORD_DEL && 2027 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 2028 /* 2029 * Regardless of flushing state we cannot sync this path if the 2030 * record represents a delete-on-disk but the target inode 2031 * is not ready to sync its own deletion. 2032 * 2033 * XXX need to count effective nlinks to determine whether 2034 * the flush is ok, otherwise removing a hardlink will 2035 * just leave the DEL record to rot. 2036 */ 2037 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 2038 return(-1); 2039 } else 2040 #endif 2041 if (pip->flush_group == flg) { 2042 /* 2043 * Because we have not calculated nlinks yet we can just 2044 * set records to the flush state if the parent is in 2045 * the same flush group as we are. 2046 */ 2047 record->flush_state = HAMMER_FST_FLUSH; 2048 record->flush_group = flg; 2049 ++record->flush_group->refs; 2050 hammer_ref(&record->lock); 2051 2052 /* 2053 * A general directory-add contributes to our visibility. 2054 * 2055 * Otherwise it is probably a directory-delete or 2056 * delete-on-disk record and does not contribute to our 2057 * visbility (but we can still flush it). 2058 */ 2059 if (record->type == HAMMER_MEM_RECORD_ADD) 2060 return(1); 2061 return(0); 2062 } else { 2063 /* 2064 * If the parent is not in our flush group we cannot 2065 * flush this record yet, there is no visibility. 2066 * We tell the parent to reflush and mark ourselves 2067 * so the parent knows it should flush us too. 2068 */ 2069 pip->flags |= HAMMER_INODE_REFLUSH; 2070 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 2071 return(-1); 2072 } 2073 } 2074 2075 /* 2076 * This is the core routine placing an inode into the FST_FLUSH state. 2077 */ 2078 static void 2079 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 2080 { 2081 hammer_mount_t hmp = ip->hmp; 2082 int go_count; 2083 2084 /* 2085 * Set flush state and prevent the flusher from cycling into 2086 * the next flush group. Do not place the ip on the list yet. 2087 * Inodes not in the idle state get an extra reference. 2088 */ 2089 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 2090 if (ip->flush_state == HAMMER_FST_IDLE) 2091 hammer_ref(&ip->lock); 2092 ip->flush_state = HAMMER_FST_FLUSH; 2093 ip->flush_group = flg; 2094 ++hmp->flusher.group_lock; 2095 ++hmp->count_iqueued; 2096 ++hammer_count_iqueued; 2097 ++flg->total_count; 2098 hammer_redo_fifo_start_flush(ip); 2099 2100 #if 0 2101 /* 2102 * We need to be able to vfsync/truncate from the backend. 2103 * 2104 * XXX Any truncation from the backend will acquire the vnode 2105 * independently. 2106 */ 2107 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 2108 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 2109 ip->flags |= HAMMER_INODE_VHELD; 2110 vref(ip->vp); 2111 } 2112 #endif 2113 2114 /* 2115 * Figure out how many in-memory records we can actually flush 2116 * (not including inode meta-data, buffers, etc). 2117 */ 2118 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 2119 if (flags & HAMMER_FLUSH_RECURSION) { 2120 /* 2121 * If this is a upwards recursion we do not want to 2122 * recurse down again! 2123 */ 2124 go_count = 1; 2125 #if 0 2126 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2127 /* 2128 * No new records are added if we must complete a flush 2129 * from a previous cycle, but we do have to move the records 2130 * from the previous cycle to the current one. 2131 */ 2132 #if 0 2133 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2134 hammer_syncgrp_child_callback, NULL); 2135 #endif 2136 go_count = 1; 2137 #endif 2138 } else { 2139 /* 2140 * Normal flush, scan records and bring them into the flush. 2141 * Directory adds and deletes are usually skipped (they are 2142 * grouped with the related inode rather then with the 2143 * directory). 2144 * 2145 * go_count can be negative, which means the scan aborted 2146 * due to the flush group being over-full and we should 2147 * flush what we have. 2148 */ 2149 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2150 hammer_setup_child_callback, NULL); 2151 } 2152 2153 /* 2154 * This is a more involved test that includes go_count. If we 2155 * can't flush, flag the inode and return. If go_count is 0 we 2156 * were are unable to flush any records in our rec_tree and 2157 * must ignore the XDIRTY flag. 2158 */ 2159 if (go_count == 0) { 2160 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 2161 --hmp->count_iqueued; 2162 --hammer_count_iqueued; 2163 2164 --flg->total_count; 2165 ip->flush_state = HAMMER_FST_SETUP; 2166 ip->flush_group = NULL; 2167 if (flags & HAMMER_FLUSH_SIGNAL) { 2168 ip->flags |= HAMMER_INODE_REFLUSH | 2169 HAMMER_INODE_RESIGNAL; 2170 } else { 2171 ip->flags |= HAMMER_INODE_REFLUSH; 2172 } 2173 #if 0 2174 if (ip->flags & HAMMER_INODE_VHELD) { 2175 ip->flags &= ~HAMMER_INODE_VHELD; 2176 vrele(ip->vp); 2177 } 2178 #endif 2179 2180 /* 2181 * REFLUSH is needed to trigger dependancy wakeups 2182 * when an inode is in SETUP. 2183 */ 2184 ip->flags |= HAMMER_INODE_REFLUSH; 2185 if (--hmp->flusher.group_lock == 0) 2186 wakeup(&hmp->flusher.group_lock); 2187 return; 2188 } 2189 } 2190 2191 /* 2192 * Snapshot the state of the inode for the backend flusher. 2193 * 2194 * We continue to retain save_trunc_off even when all truncations 2195 * have been resolved as an optimization to determine if we can 2196 * skip the B-Tree lookup for overwrite deletions. 2197 * 2198 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 2199 * and stays in ip->flags. Once set, it stays set until the 2200 * inode is destroyed. 2201 */ 2202 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2203 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 2204 ip->sync_trunc_off = ip->trunc_off; 2205 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 2206 ip->flags &= ~HAMMER_INODE_TRUNCATED; 2207 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 2208 2209 /* 2210 * The save_trunc_off used to cache whether the B-Tree 2211 * holds any records past that point is not used until 2212 * after the truncation has succeeded, so we can safely 2213 * set it now. 2214 */ 2215 if (ip->save_trunc_off > ip->sync_trunc_off) 2216 ip->save_trunc_off = ip->sync_trunc_off; 2217 } 2218 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 2219 ~HAMMER_INODE_TRUNCATED); 2220 ip->sync_ino_leaf = ip->ino_leaf; 2221 ip->sync_ino_data = ip->ino_data; 2222 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 2223 2224 /* 2225 * The flusher list inherits our inode and reference. 2226 */ 2227 KKASSERT(flg->running == 0); 2228 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip); 2229 if (--hmp->flusher.group_lock == 0) 2230 wakeup(&hmp->flusher.group_lock); 2231 2232 /* 2233 * Auto-flush the group if it grows too large. Make sure the 2234 * inode reclaim wait pipeline continues to work. 2235 */ 2236 if (flg->total_count >= hammer_autoflush || 2237 flg->total_count >= hammer_limit_reclaims / 4) { 2238 if (hmp->fill_flush_group == flg) 2239 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry); 2240 hammer_flusher_async(hmp, flg); 2241 } 2242 } 2243 2244 /* 2245 * Callback for scan of ip->rec_tree. Try to include each record in our 2246 * flush. ip->flush_group has been set but the inode has not yet been 2247 * moved into a flushing state. 2248 * 2249 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 2250 * both inodes. 2251 * 2252 * We return 1 for any record placed or found in FST_FLUSH, which prevents 2253 * the caller from shortcutting the flush. 2254 */ 2255 static int 2256 hammer_setup_child_callback(hammer_record_t rec, void *data) 2257 { 2258 hammer_flush_group_t flg; 2259 hammer_inode_t target_ip; 2260 hammer_inode_t ip; 2261 int r; 2262 2263 /* 2264 * Records deleted or committed by the backend are ignored. 2265 * Note that the flush detects deleted frontend records at 2266 * multiple points to deal with races. This is just the first 2267 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot 2268 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it 2269 * messes up link-count calculations. 2270 * 2271 * NOTE: Don't get confused between record deletion and, say, 2272 * directory entry deletion. The deletion of a directory entry 2273 * which is on-media has nothing to do with the record deletion 2274 * flags. 2275 */ 2276 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 2277 HAMMER_RECF_COMMITTED)) { 2278 if (rec->flush_state == HAMMER_FST_FLUSH) { 2279 KKASSERT(rec->flush_group == rec->ip->flush_group); 2280 r = 1; 2281 } else { 2282 r = 0; 2283 } 2284 return(r); 2285 } 2286 2287 /* 2288 * If the record is in an idle state it has no dependancies and 2289 * can be flushed. 2290 */ 2291 ip = rec->ip; 2292 flg = ip->flush_group; 2293 r = 0; 2294 2295 switch(rec->flush_state) { 2296 case HAMMER_FST_IDLE: 2297 /* 2298 * The record has no setup dependancy, we can flush it. 2299 */ 2300 KKASSERT(rec->target_ip == NULL); 2301 rec->flush_state = HAMMER_FST_FLUSH; 2302 rec->flush_group = flg; 2303 ++flg->refs; 2304 hammer_ref(&rec->lock); 2305 r = 1; 2306 break; 2307 case HAMMER_FST_SETUP: 2308 /* 2309 * The record has a setup dependancy. These are typically 2310 * directory entry adds and deletes. Such entries will be 2311 * flushed when their inodes are flushed so we do not 2312 * usually have to add them to the flush here. However, 2313 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 2314 * it is asking us to flush this record (and it). 2315 */ 2316 target_ip = rec->target_ip; 2317 KKASSERT(target_ip != NULL); 2318 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 2319 2320 /* 2321 * If the target IP is already flushing in our group 2322 * we could associate the record, but target_ip has 2323 * already synced ino_data to sync_ino_data and we 2324 * would also have to adjust nlinks. Plus there are 2325 * ordering issues for adds and deletes. 2326 * 2327 * Reflush downward if this is an ADD, and upward if 2328 * this is a DEL. 2329 */ 2330 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 2331 if (rec->type == HAMMER_MEM_RECORD_ADD) 2332 ip->flags |= HAMMER_INODE_REFLUSH; 2333 else 2334 target_ip->flags |= HAMMER_INODE_REFLUSH; 2335 break; 2336 } 2337 2338 /* 2339 * Target IP is not yet flushing. This can get complex 2340 * because we have to be careful about the recursion. 2341 * 2342 * Directories create an issue for us in that if a flush 2343 * of a directory is requested the expectation is to flush 2344 * any pending directory entries, but this will cause the 2345 * related inodes to recursively flush as well. We can't 2346 * really defer the operation so just get as many as we 2347 * can and 2348 */ 2349 #if 0 2350 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 2351 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 2352 /* 2353 * We aren't reclaiming and the target ip was not 2354 * previously prevented from flushing due to this 2355 * record dependancy. Do not flush this record. 2356 */ 2357 /*r = 0;*/ 2358 } else 2359 #endif 2360 if (flg->total_count + flg->refs > 2361 ip->hmp->undo_rec_limit) { 2362 /* 2363 * Our flush group is over-full and we risk blowing 2364 * out the UNDO FIFO. Stop the scan, flush what we 2365 * have, then reflush the directory. 2366 * 2367 * The directory may be forced through multiple 2368 * flush groups before it can be completely 2369 * flushed. 2370 */ 2371 ip->flags |= HAMMER_INODE_RESIGNAL | 2372 HAMMER_INODE_REFLUSH; 2373 r = -1; 2374 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 2375 /* 2376 * If the target IP is not flushing we can force 2377 * it to flush, even if it is unable to write out 2378 * any of its own records we have at least one in 2379 * hand that we CAN deal with. 2380 */ 2381 rec->flush_state = HAMMER_FST_FLUSH; 2382 rec->flush_group = flg; 2383 ++flg->refs; 2384 hammer_ref(&rec->lock); 2385 hammer_flush_inode_core(target_ip, flg, 2386 HAMMER_FLUSH_RECURSION); 2387 r = 1; 2388 } else { 2389 /* 2390 * General or delete-on-disk record. 2391 * 2392 * XXX this needs help. If a delete-on-disk we could 2393 * disconnect the target. If the target has its own 2394 * dependancies they really need to be flushed. 2395 * 2396 * XXX 2397 */ 2398 rec->flush_state = HAMMER_FST_FLUSH; 2399 rec->flush_group = flg; 2400 ++flg->refs; 2401 hammer_ref(&rec->lock); 2402 hammer_flush_inode_core(target_ip, flg, 2403 HAMMER_FLUSH_RECURSION); 2404 r = 1; 2405 } 2406 break; 2407 case HAMMER_FST_FLUSH: 2408 /* 2409 * The record could be part of a previous flush group if the 2410 * inode is a directory (the record being a directory entry). 2411 * Once the flush group was closed a hammer_test_inode() 2412 * function can cause a new flush group to be setup, placing 2413 * the directory inode itself in a new flush group. 2414 * 2415 * When associated with a previous flush group we count it 2416 * as if it were in our current flush group, since it will 2417 * effectively be flushed by the time we flush our current 2418 * flush group. 2419 */ 2420 KKASSERT( 2421 rec->ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY || 2422 rec->flush_group == flg); 2423 r = 1; 2424 break; 2425 } 2426 return(r); 2427 } 2428 2429 #if 0 2430 /* 2431 * This version just moves records already in a flush state to the new 2432 * flush group and that is it. 2433 */ 2434 static int 2435 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 2436 { 2437 hammer_inode_t ip = rec->ip; 2438 2439 switch(rec->flush_state) { 2440 case HAMMER_FST_FLUSH: 2441 KKASSERT(rec->flush_group == ip->flush_group); 2442 break; 2443 default: 2444 break; 2445 } 2446 return(0); 2447 } 2448 #endif 2449 2450 /* 2451 * Wait for a previously queued flush to complete. 2452 * 2453 * If a critical error occured we don't try to wait. 2454 */ 2455 void 2456 hammer_wait_inode(hammer_inode_t ip) 2457 { 2458 /* 2459 * The inode can be in a SETUP state in which case RESIGNAL 2460 * should be set. If RESIGNAL is not set then the previous 2461 * flush completed and a later operation placed the inode 2462 * in a passive setup state again, so we're done. 2463 * 2464 * The inode can be in a FLUSH state in which case we 2465 * can just wait for completion. 2466 */ 2467 while (ip->flush_state == HAMMER_FST_FLUSH || 2468 (ip->flush_state == HAMMER_FST_SETUP && 2469 (ip->flags & HAMMER_INODE_RESIGNAL))) { 2470 /* 2471 * Don't try to flush on a critical error 2472 */ 2473 if (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) 2474 break; 2475 2476 /* 2477 * If the inode was already being flushed its flg 2478 * may not have been queued to the backend. We 2479 * have to make sure it gets queued or we can wind 2480 * up blocked or deadlocked (particularly if we are 2481 * the vnlru thread). 2482 */ 2483 if (ip->flush_state == HAMMER_FST_FLUSH) { 2484 KKASSERT(ip->flush_group); 2485 if (ip->flush_group->closed == 0) { 2486 if (hammer_debug_inode) { 2487 hkprintf("debug: forcing " 2488 "async flush ip %016jx\n", 2489 (intmax_t)ip->obj_id); 2490 } 2491 hammer_flusher_async(ip->hmp, ip->flush_group); 2492 continue; /* retest */ 2493 } 2494 } 2495 2496 /* 2497 * In a flush state with the flg queued to the backend 2498 * or in a setup state with RESIGNAL set, we can safely 2499 * wait. 2500 */ 2501 ip->flags |= HAMMER_INODE_FLUSHW; 2502 tsleep(&ip->flags, 0, "hmrwin", 0); 2503 } 2504 2505 #if 0 2506 /* 2507 * The inode may have been in a passive setup state, 2508 * call flush to make sure we get signaled. 2509 */ 2510 if (ip->flush_state == HAMMER_FST_SETUP) 2511 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2512 #endif 2513 2514 } 2515 2516 /* 2517 * Called by the backend code when a flush has been completed. 2518 * The inode has already been removed from the flush list. 2519 * 2520 * A pipelined flush can occur, in which case we must re-enter the 2521 * inode on the list and re-copy its fields. 2522 */ 2523 void 2524 hammer_flush_inode_done(hammer_inode_t ip, int error) 2525 { 2526 hammer_mount_t hmp; 2527 int dorel; 2528 2529 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2530 2531 hmp = ip->hmp; 2532 2533 /* 2534 * Auto-reflush if the backend could not completely flush 2535 * the inode. This fixes a case where a deferred buffer flush 2536 * could cause fsync to return early. 2537 */ 2538 if (ip->sync_flags & HAMMER_INODE_MODMASK) 2539 ip->flags |= HAMMER_INODE_REFLUSH; 2540 2541 /* 2542 * Merge left-over flags back into the frontend and fix the state. 2543 * Incomplete truncations are retained by the backend. 2544 */ 2545 ip->error = error; 2546 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2547 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2548 2549 /* 2550 * The backend may have adjusted nlinks, so if the adjusted nlinks 2551 * does not match the fronttend set the frontend's DDIRTY flag again. 2552 */ 2553 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2554 ip->flags |= HAMMER_INODE_DDIRTY; 2555 2556 /* 2557 * Fix up the dirty buffer status. 2558 */ 2559 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2560 ip->flags |= HAMMER_INODE_BUFS; 2561 } 2562 hammer_redo_fifo_end_flush(ip); 2563 2564 /* 2565 * Re-set the XDIRTY flag if some of the inode's in-memory records 2566 * could not be flushed. 2567 */ 2568 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2569 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2570 (!RB_EMPTY(&ip->rec_tree) && 2571 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2572 2573 /* 2574 * Do not lose track of inodes which no longer have vnode 2575 * assocations, otherwise they may never get flushed again. 2576 * 2577 * The reflush flag can be set superfluously, causing extra pain 2578 * for no reason. If the inode is no longer modified it no longer 2579 * needs to be flushed. 2580 */ 2581 if (ip->flags & HAMMER_INODE_MODMASK) { 2582 if (ip->vp == NULL) 2583 ip->flags |= HAMMER_INODE_REFLUSH; 2584 } else { 2585 ip->flags &= ~HAMMER_INODE_REFLUSH; 2586 } 2587 2588 /* 2589 * The fs token is held but the inode lock is not held. Because this 2590 * is a backend flush it is possible that the vnode has no references 2591 * and cause a reclaim race inside vsetisdirty() if/when it blocks. 2592 * 2593 * Therefore, we must lock the inode around this particular dirtying 2594 * operation. We don't have to around other dirtying operations 2595 * where the vnode is implicitly or explicitly held. 2596 */ 2597 if (ip->flags & HAMMER_INODE_MODMASK) { 2598 hammer_lock_ex(&ip->lock); 2599 hammer_inode_dirty(ip); 2600 hammer_unlock(&ip->lock); 2601 } 2602 2603 /* 2604 * Adjust the flush state. 2605 */ 2606 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2607 /* 2608 * We were unable to flush out all our records, leave the 2609 * inode in a flush state and in the current flush group. 2610 * The flush group will be re-run. 2611 * 2612 * This occurs if the UNDO block gets too full or there is 2613 * too much dirty meta-data and allows the flusher to 2614 * finalize the UNDO block and then re-flush. 2615 */ 2616 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2617 dorel = 0; 2618 } else { 2619 /* 2620 * Remove from the flush_group 2621 */ 2622 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 2623 ip->flush_group = NULL; 2624 2625 #if 0 2626 /* 2627 * Clean up the vnode ref and tracking counts. 2628 */ 2629 if (ip->flags & HAMMER_INODE_VHELD) { 2630 ip->flags &= ~HAMMER_INODE_VHELD; 2631 vrele(ip->vp); 2632 } 2633 #endif 2634 --hmp->count_iqueued; 2635 --hammer_count_iqueued; 2636 2637 /* 2638 * And adjust the state. 2639 */ 2640 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2641 ip->flush_state = HAMMER_FST_IDLE; 2642 dorel = 1; 2643 } else { 2644 ip->flush_state = HAMMER_FST_SETUP; 2645 dorel = 0; 2646 } 2647 2648 /* 2649 * If the frontend is waiting for a flush to complete, 2650 * wake it up. 2651 */ 2652 if (ip->flags & HAMMER_INODE_FLUSHW) { 2653 ip->flags &= ~HAMMER_INODE_FLUSHW; 2654 wakeup(&ip->flags); 2655 } 2656 2657 /* 2658 * If the frontend made more changes and requested another 2659 * flush, then try to get it running. 2660 * 2661 * Reflushes are aborted when the inode is errored out. 2662 */ 2663 if (ip->flags & HAMMER_INODE_REFLUSH) { 2664 ip->flags &= ~HAMMER_INODE_REFLUSH; 2665 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2666 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2667 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2668 } else { 2669 hammer_flush_inode(ip, 0); 2670 } 2671 } 2672 } 2673 2674 /* 2675 * If we have no parent dependancies we can clear CONN_DOWN 2676 */ 2677 if (TAILQ_EMPTY(&ip->target_list)) 2678 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2679 2680 /* 2681 * If the inode is now clean drop the space reservation. 2682 */ 2683 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2684 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2685 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2686 --hmp->rsv_inodes; 2687 } 2688 2689 ip->flags &= ~HAMMER_INODE_SLAVEFLUSH; 2690 2691 if (dorel) 2692 hammer_rel_inode(ip, 0); 2693 } 2694 2695 /* 2696 * Called from hammer_sync_inode() to synchronize in-memory records 2697 * to the media. 2698 */ 2699 static int 2700 hammer_sync_record_callback(hammer_record_t record, void *data) 2701 { 2702 hammer_cursor_t cursor = data; 2703 hammer_transaction_t trans = cursor->trans; 2704 hammer_mount_t hmp = trans->hmp; 2705 int error; 2706 2707 /* 2708 * Skip records that do not belong to the current flush. 2709 */ 2710 ++hammer_stats_record_iterations; 2711 if (record->flush_state != HAMMER_FST_FLUSH) 2712 return(0); 2713 2714 if (record->flush_group != record->ip->flush_group) { 2715 hdkprintf("rec %p ip %p bad flush group %p %p\n", 2716 record, 2717 record->ip, 2718 record->flush_group, 2719 record->ip->flush_group); 2720 if (hammer_debug_critical) 2721 Debugger("blah2"); 2722 return(0); 2723 } 2724 KKASSERT(record->flush_group == record->ip->flush_group); 2725 2726 /* 2727 * Interlock the record using the BE flag. Once BE is set the 2728 * frontend cannot change the state of FE. 2729 * 2730 * NOTE: If FE is set prior to us setting BE we still sync the 2731 * record out, but the flush completion code converts it to 2732 * a delete-on-disk record instead of destroying it. 2733 */ 2734 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2735 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2736 2737 /* 2738 * The backend has already disposed of the record. 2739 */ 2740 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { 2741 error = 0; 2742 goto done; 2743 } 2744 2745 /* 2746 * If the whole inode is being deleted and all on-disk records will 2747 * be deleted very soon, we can't sync any new records to disk 2748 * because they will be deleted in the same transaction they were 2749 * created in (delete_tid == create_tid), which will assert. 2750 * 2751 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2752 * that we currently panic on. 2753 */ 2754 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2755 switch(record->type) { 2756 case HAMMER_MEM_RECORD_DATA: 2757 /* 2758 * We don't have to do anything, if the record was 2759 * committed the space will have been accounted for 2760 * in the blockmap. 2761 */ 2762 /* fall through */ 2763 case HAMMER_MEM_RECORD_GENERAL: 2764 /* 2765 * Set deleted-by-backend flag. Do not set the 2766 * backend committed flag, because we are throwing 2767 * the record away. 2768 */ 2769 record->flags |= HAMMER_RECF_DELETED_BE; 2770 ++record->ip->rec_generation; 2771 error = 0; 2772 goto done; 2773 case HAMMER_MEM_RECORD_ADD: 2774 hpanic("illegal add during inode deletion record %p", 2775 record); 2776 break; /* NOT REACHED */ 2777 case HAMMER_MEM_RECORD_INODE: 2778 hpanic("attempt to sync inode record %p?", record); 2779 break; /* NOT REACHED */ 2780 case HAMMER_MEM_RECORD_DEL: 2781 /* 2782 * Follow through and issue the on-disk deletion 2783 */ 2784 break; 2785 } 2786 } 2787 2788 /* 2789 * If DELETED_FE is set special handling is needed for directory 2790 * entries. Dependant pieces related to the directory entry may 2791 * have already been synced to disk. If this occurs we have to 2792 * sync the directory entry and then change the in-memory record 2793 * from an ADD to a DELETE to cover the fact that it's been 2794 * deleted by the frontend. 2795 * 2796 * A directory delete covering record (MEM_RECORD_DEL) can never 2797 * be deleted by the frontend. 2798 * 2799 * Any other record type (aka DATA) can be deleted by the frontend. 2800 * XXX At the moment the flusher must skip it because there may 2801 * be another data record in the flush group for the same block, 2802 * meaning that some frontend data changes can leak into the backend's 2803 * synchronization point. 2804 */ 2805 if (record->flags & HAMMER_RECF_DELETED_FE) { 2806 if (record->type == HAMMER_MEM_RECORD_ADD) { 2807 /* 2808 * Convert a front-end deleted directory-add to 2809 * a directory-delete entry later. 2810 */ 2811 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2812 } else { 2813 /* 2814 * Dispose of the record (race case). Mark as 2815 * deleted by backend (and not committed). 2816 */ 2817 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2818 record->flags |= HAMMER_RECF_DELETED_BE; 2819 ++record->ip->rec_generation; 2820 error = 0; 2821 goto done; 2822 } 2823 } 2824 2825 /* 2826 * Assign the create_tid for new records. Deletions already 2827 * have the record's entire key properly set up. 2828 */ 2829 if (record->type != HAMMER_MEM_RECORD_DEL) { 2830 record->leaf.base.create_tid = trans->tid; 2831 record->leaf.create_ts = trans->time32; 2832 } 2833 2834 /* 2835 * This actually moves the record to the on-media B-Tree. We 2836 * must also generate REDO_TERM entries in the UNDO/REDO FIFO 2837 * indicating that the related REDO_WRITE(s) have been committed. 2838 * 2839 * During recovery any REDO_TERM's within the nominal recovery span 2840 * are ignored since the related meta-data is being undone, causing 2841 * any matching REDO_WRITEs to execute. The REDO_TERMs outside 2842 * the nominal recovery span will match against REDO_WRITEs and 2843 * prevent them from being executed (because the meta-data has 2844 * already been synchronized). 2845 */ 2846 if (record->flags & HAMMER_RECF_REDO) { 2847 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA); 2848 hammer_generate_redo(trans, record->ip, 2849 record->leaf.base.key - 2850 record->leaf.data_len, 2851 HAMMER_REDO_TERM_WRITE, 2852 NULL, 2853 record->leaf.data_len); 2854 } 2855 2856 for (;;) { 2857 error = hammer_ip_sync_record_cursor(cursor, record); 2858 if (error != EDEADLK) 2859 break; 2860 hammer_done_cursor(cursor); 2861 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2862 record->ip); 2863 if (error) 2864 break; 2865 } 2866 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2867 2868 if (error) 2869 error = -error; 2870 done: 2871 hammer_flush_record_done(record, error); 2872 2873 /* 2874 * Do partial finalization if we have built up too many dirty 2875 * buffers. Otherwise a buffer cache deadlock can occur when 2876 * doing things like creating tens of thousands of tiny files. 2877 * 2878 * We must release our cursor lock to avoid a 3-way deadlock 2879 * due to the exclusive sync lock the finalizer must get. 2880 * 2881 * WARNING: See warnings in hammer_unlock_cursor() function. 2882 */ 2883 if (hammer_flusher_meta_limit(hmp) || 2884 vm_page_count_severe()) { 2885 hammer_unlock_cursor(cursor); 2886 hammer_flusher_finalize(trans, 0); 2887 hammer_lock_cursor(cursor); 2888 } 2889 return(error); 2890 } 2891 2892 /* 2893 * Backend function called by the flusher to sync an inode to media. 2894 */ 2895 int 2896 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2897 { 2898 struct hammer_cursor cursor; 2899 hammer_node_t tmp_node; 2900 hammer_record_t depend; 2901 hammer_record_t next; 2902 int error, tmp_error; 2903 uint64_t nlinks; 2904 2905 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2906 return(0); 2907 2908 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2909 if (error) 2910 goto done; 2911 2912 /* 2913 * Any directory records referencing this inode which are not in 2914 * our current flush group must adjust our nlink count for the 2915 * purposes of synchronizating to disk. 2916 * 2917 * Records which are in our flush group can be unlinked from our 2918 * inode now, potentially allowing the inode to be physically 2919 * deleted. 2920 * 2921 * This cannot block. 2922 */ 2923 nlinks = ip->ino_data.nlinks; 2924 next = TAILQ_FIRST(&ip->target_list); 2925 while ((depend = next) != NULL) { 2926 next = TAILQ_NEXT(depend, target_entry); 2927 if (depend->flush_state == HAMMER_FST_FLUSH && 2928 depend->flush_group == ip->flush_group) { 2929 /* 2930 * If this is an ADD that was deleted by the frontend 2931 * the frontend nlinks count will have already been 2932 * decremented, but the backend is going to sync its 2933 * directory entry and must account for it. The 2934 * record will be converted to a delete-on-disk when 2935 * it gets synced. 2936 * 2937 * If the ADD was not deleted by the frontend we 2938 * can remove the dependancy from our target_list. 2939 */ 2940 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2941 ++nlinks; 2942 } else { 2943 TAILQ_REMOVE(&ip->target_list, depend, 2944 target_entry); 2945 depend->target_ip = NULL; 2946 } 2947 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2948 /* 2949 * Not part of our flush group and not deleted by 2950 * the front-end, adjust the link count synced to 2951 * the media (undo what the frontend did when it 2952 * queued the record). 2953 */ 2954 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2955 switch(depend->type) { 2956 case HAMMER_MEM_RECORD_ADD: 2957 --nlinks; 2958 break; 2959 case HAMMER_MEM_RECORD_DEL: 2960 ++nlinks; 2961 break; 2962 default: 2963 break; 2964 } 2965 } 2966 } 2967 2968 /* 2969 * Set dirty if we had to modify the link count. 2970 */ 2971 if (ip->sync_ino_data.nlinks != nlinks) { 2972 KKASSERT((int64_t)nlinks >= 0); 2973 ip->sync_ino_data.nlinks = nlinks; 2974 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2975 } 2976 2977 /* 2978 * If there is a trunction queued destroy any data past the (aligned) 2979 * truncation point. Userland will have dealt with the buffer 2980 * containing the truncation point for us. 2981 * 2982 * We don't flush pending frontend data buffers until after we've 2983 * dealt with the truncation. 2984 */ 2985 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2986 /* 2987 * Interlock trunc_off. The VOP front-end may continue to 2988 * make adjustments to it while we are blocked. 2989 */ 2990 off_t trunc_off; 2991 off_t aligned_trunc_off; 2992 int blkmask; 2993 2994 trunc_off = ip->sync_trunc_off; 2995 blkmask = hammer_blocksize(trunc_off) - 1; 2996 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2997 2998 /* 2999 * Delete any whole blocks on-media. The front-end has 3000 * already cleaned out any partial block and made it 3001 * pending. The front-end may have updated trunc_off 3002 * while we were blocked so we only use sync_trunc_off. 3003 * 3004 * This operation can blow out the buffer cache, EWOULDBLOCK 3005 * means we were unable to complete the deletion. The 3006 * deletion will update sync_trunc_off in that case. 3007 */ 3008 error = hammer_ip_delete_range(&cursor, ip, 3009 aligned_trunc_off, 3010 0x7FFFFFFFFFFFFFFFLL, 2); 3011 if (error == EWOULDBLOCK) { 3012 ip->flags |= HAMMER_INODE_WOULDBLOCK; 3013 error = 0; 3014 goto defer_buffer_flush; 3015 } 3016 3017 if (error) 3018 goto done; 3019 3020 /* 3021 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO. 3022 * 3023 * XXX we do this even if we did not previously generate 3024 * a REDO_TRUNC record. This operation may enclosed the 3025 * range for multiple prior truncation entries in the REDO 3026 * log. 3027 */ 3028 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR && 3029 (ip->flags & HAMMER_INODE_RDIRTY)) { 3030 hammer_generate_redo(trans, ip, aligned_trunc_off, 3031 HAMMER_REDO_TERM_TRUNC, 3032 NULL, 0); 3033 } 3034 3035 /* 3036 * Clear the truncation flag on the backend after we have 3037 * completed the deletions. Backend data is now good again 3038 * (including new records we are about to sync, below). 3039 * 3040 * Leave sync_trunc_off intact. As we write additional 3041 * records the backend will update sync_trunc_off. This 3042 * tells the backend whether it can skip the overwrite 3043 * test. This should work properly even when the backend 3044 * writes full blocks where the truncation point straddles 3045 * the block because the comparison is against the base 3046 * offset of the record. 3047 */ 3048 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 3049 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 3050 } else { 3051 error = 0; 3052 } 3053 3054 /* 3055 * Now sync related records. These will typically be directory 3056 * entries, records tracking direct-writes, or delete-on-disk records. 3057 */ 3058 if (error == 0) { 3059 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 3060 hammer_sync_record_callback, &cursor); 3061 if (tmp_error < 0) 3062 tmp_error = -error; 3063 if (tmp_error) 3064 error = tmp_error; 3065 } 3066 hammer_cache_node(&ip->cache[1], cursor.node); 3067 3068 /* 3069 * Re-seek for inode update, assuming our cache hasn't been ripped 3070 * out from under us. 3071 */ 3072 if (error == 0) { 3073 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error); 3074 if (tmp_node) { 3075 hammer_cursor_downgrade(&cursor); 3076 hammer_lock_sh(&tmp_node->lock); 3077 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 3078 hammer_cursor_seek(&cursor, tmp_node, 0); 3079 hammer_unlock(&tmp_node->lock); 3080 hammer_rel_node(tmp_node); 3081 } 3082 error = 0; 3083 } 3084 3085 /* 3086 * If we are deleting the inode the frontend had better not have 3087 * any active references on elements making up the inode. 3088 * 3089 * The call to hammer_ip_delete_clean() cleans up auxillary records 3090 * but not DB or DATA records. Those must have already been deleted 3091 * by the normal truncation mechanic. 3092 */ 3093 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 3094 RB_EMPTY(&ip->rec_tree) && 3095 (ip->sync_flags & HAMMER_INODE_DELETING) && 3096 (ip->flags & HAMMER_INODE_DELETED) == 0) { 3097 int count1 = 0; 3098 3099 error = hammer_ip_delete_clean(&cursor, ip, &count1); 3100 if (error == 0) { 3101 ip->flags |= HAMMER_INODE_DELETED; 3102 ip->sync_flags &= ~HAMMER_INODE_DELETING; 3103 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 3104 KKASSERT(RB_EMPTY(&ip->rec_tree)); 3105 3106 /* 3107 * Set delete_tid in both the frontend and backend 3108 * copy of the inode record. The DELETED flag handles 3109 * this, do not set DDIRTY. 3110 */ 3111 ip->ino_leaf.base.delete_tid = trans->tid; 3112 ip->sync_ino_leaf.base.delete_tid = trans->tid; 3113 ip->ino_leaf.delete_ts = trans->time32; 3114 ip->sync_ino_leaf.delete_ts = trans->time32; 3115 3116 3117 /* 3118 * Adjust the inode count in the volume header 3119 */ 3120 hammer_sync_lock_sh(trans); 3121 if (ip->flags & HAMMER_INODE_ONDISK) { 3122 hammer_modify_volume_field(trans, 3123 trans->rootvol, 3124 vol0_stat_inodes); 3125 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 3126 hammer_modify_volume_done(trans->rootvol); 3127 } 3128 hammer_sync_unlock(trans); 3129 } 3130 } 3131 3132 if (error) 3133 goto done; 3134 ip->sync_flags &= ~HAMMER_INODE_BUFS; 3135 3136 defer_buffer_flush: 3137 /* 3138 * Now update the inode's on-disk inode-data and/or on-disk record. 3139 * DELETED and ONDISK are managed only in ip->flags. 3140 * 3141 * In the case of a defered buffer flush we still update the on-disk 3142 * inode to satisfy visibility requirements if there happen to be 3143 * directory dependancies. 3144 */ 3145 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 3146 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 3147 /* 3148 * If deleted and on-disk, don't set any additional flags. 3149 * the delete flag takes care of things. 3150 * 3151 * Clear flags which may have been set by the frontend. 3152 */ 3153 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 3154 HAMMER_INODE_SDIRTY | 3155 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 3156 HAMMER_INODE_DELETING); 3157 break; 3158 case HAMMER_INODE_DELETED: 3159 /* 3160 * Take care of the case where a deleted inode was never 3161 * flushed to the disk in the first place. 3162 * 3163 * Clear flags which may have been set by the frontend. 3164 */ 3165 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 3166 HAMMER_INODE_SDIRTY | 3167 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 3168 HAMMER_INODE_DELETING); 3169 while (RB_ROOT(&ip->rec_tree)) { 3170 hammer_record_t record = RB_ROOT(&ip->rec_tree); 3171 hammer_ref(&record->lock); 3172 KKASSERT(hammer_oneref(&record->lock)); 3173 record->flags |= HAMMER_RECF_DELETED_BE; 3174 ++record->ip->rec_generation; 3175 hammer_rel_mem_record(record); 3176 } 3177 break; 3178 case HAMMER_INODE_ONDISK: 3179 /* 3180 * If already on-disk, do not set any additional flags. 3181 */ 3182 break; 3183 default: 3184 /* 3185 * If not on-disk and not deleted, set DDIRTY to force 3186 * an initial record to be written. 3187 * 3188 * Also set the create_tid in both the frontend and backend 3189 * copy of the inode record. 3190 */ 3191 ip->ino_leaf.base.create_tid = trans->tid; 3192 ip->ino_leaf.create_ts = trans->time32; 3193 ip->sync_ino_leaf.base.create_tid = trans->tid; 3194 ip->sync_ino_leaf.create_ts = trans->time32; 3195 ip->sync_flags |= HAMMER_INODE_DDIRTY; 3196 break; 3197 } 3198 3199 /* 3200 * If DDIRTY or SDIRTY is set, write out a new record. 3201 * If the inode is already on-disk the old record is marked as 3202 * deleted. 3203 * 3204 * If DELETED is set hammer_update_inode() will delete the existing 3205 * record without writing out a new one. 3206 */ 3207 if (ip->flags & HAMMER_INODE_DELETED) { 3208 error = hammer_update_inode(&cursor, ip); 3209 } else 3210 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) && 3211 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 3212 error = hammer_update_itimes(&cursor, ip); 3213 } else 3214 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY | 3215 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 3216 error = hammer_update_inode(&cursor, ip); 3217 } 3218 done: 3219 if (ip->flags & HAMMER_INODE_MODMASK) 3220 hammer_inode_dirty(ip); 3221 if (error) { 3222 hammer_critical_error(ip->hmp, ip, error, 3223 "while syncing inode"); 3224 } 3225 hammer_done_cursor(&cursor); 3226 return(error); 3227 } 3228 3229 /* 3230 * This routine is called when the OS is no longer actively referencing 3231 * the inode (but might still be keeping it cached), or when releasing 3232 * the last reference to an inode. 3233 * 3234 * At this point if the inode's nlinks count is zero we want to destroy 3235 * it, which may mean destroying it on-media too. 3236 */ 3237 void 3238 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 3239 { 3240 struct vnode *vp; 3241 3242 /* 3243 * Set the DELETING flag when the link count drops to 0 and the 3244 * OS no longer has any opens on the inode. 3245 * 3246 * The backend will clear DELETING (a mod flag) and set DELETED 3247 * (a state flag) when it is actually able to perform the 3248 * operation. 3249 * 3250 * Don't reflag the deletion if the flusher is currently syncing 3251 * one that was already flagged. A previously set DELETING flag 3252 * may bounce around flags and sync_flags until the operation is 3253 * completely done. 3254 * 3255 * Do not attempt to modify a snapshot inode (one set to read-only). 3256 */ 3257 if (ip->ino_data.nlinks == 0 && 3258 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_RO|HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 3259 ip->flags |= HAMMER_INODE_DELETING; 3260 ip->flags |= HAMMER_INODE_TRUNCATED; 3261 ip->trunc_off = 0; 3262 vp = NULL; 3263 if (getvp) { 3264 if (hammer_get_vnode(ip, &vp) != 0) 3265 return; 3266 } 3267 3268 /* 3269 * Final cleanup 3270 */ 3271 if (ip->vp) 3272 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0, 0); 3273 if (ip->flags & HAMMER_INODE_MODMASK) 3274 hammer_inode_dirty(ip); 3275 if (getvp) 3276 vput(vp); 3277 } 3278 } 3279 3280 /* 3281 * After potentially resolving a dependancy the inode is tested 3282 * to determine whether it needs to be reflushed. 3283 */ 3284 void 3285 hammer_test_inode(hammer_inode_t ip) 3286 { 3287 if (ip->flags & HAMMER_INODE_REFLUSH) { 3288 ip->flags &= ~HAMMER_INODE_REFLUSH; 3289 hammer_ref(&ip->lock); 3290 if (ip->flags & HAMMER_INODE_RESIGNAL) { 3291 ip->flags &= ~HAMMER_INODE_RESIGNAL; 3292 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 3293 } else { 3294 hammer_flush_inode(ip, 0); 3295 } 3296 hammer_rel_inode(ip, 0); 3297 } 3298 } 3299 3300 /* 3301 * Clear the RECLAIM flag on an inode. This occurs when the inode is 3302 * reassociated with a vp or just before it gets freed. 3303 * 3304 * Pipeline wakeups to threads blocked due to an excessive number of 3305 * detached inodes. This typically occurs when atime updates accumulate 3306 * while scanning a directory tree. 3307 */ 3308 static void 3309 hammer_inode_wakereclaims(hammer_inode_t ip) 3310 { 3311 struct hammer_reclaim *reclaim; 3312 hammer_mount_t hmp = ip->hmp; 3313 3314 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 3315 return; 3316 3317 --hammer_count_reclaims; 3318 --hmp->count_reclaims; 3319 ip->flags &= ~HAMMER_INODE_RECLAIM; 3320 3321 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) { 3322 KKASSERT(reclaim->count > 0); 3323 if (--reclaim->count == 0) { 3324 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 3325 wakeup(reclaim); 3326 } 3327 } 3328 } 3329 3330 /* 3331 * Setup our reclaim pipeline. We only let so many detached (and dirty) 3332 * inodes build up before we start blocking. This routine is called 3333 * if a new inode is created or an inode is loaded from media. 3334 * 3335 * When we block we don't care *which* inode has finished reclaiming, 3336 * as long as one does. 3337 * 3338 * The reclaim pipeline is primarily governed by the auto-flush which is 3339 * 1/4 hammer_limit_reclaims. We don't want to block if the count is 3340 * less than 1/2 hammer_limit_reclaims. From 1/2 to full count is 3341 * dynamically governed. 3342 */ 3343 void 3344 hammer_inode_waitreclaims(hammer_transaction_t trans) 3345 { 3346 hammer_mount_t hmp = trans->hmp; 3347 struct hammer_reclaim reclaim; 3348 int lower_limit; 3349 3350 /* 3351 * Track inode load, delay if the number of reclaiming inodes is 3352 * between 2/4 and 4/4 hammer_limit_reclaims, depending. 3353 */ 3354 if (curthread->td_proc) { 3355 struct hammer_inostats *stats; 3356 3357 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid); 3358 ++stats->count; 3359 3360 if (stats->count > hammer_limit_reclaims / 2) 3361 stats->count = hammer_limit_reclaims / 2; 3362 lower_limit = hammer_limit_reclaims - stats->count; 3363 if (hammer_debug_general & 0x10000) { 3364 hdkprintf("pid %5d limit %d\n", 3365 (int)curthread->td_proc->p_pid, lower_limit); 3366 } 3367 } else { 3368 lower_limit = hammer_limit_reclaims * 3 / 4; 3369 } 3370 if (hmp->count_reclaims >= lower_limit) { 3371 reclaim.count = 1; 3372 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry); 3373 tsleep(&reclaim, 0, "hmrrcm", hz); 3374 if (reclaim.count > 0) 3375 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 3376 } 3377 } 3378 3379 /* 3380 * Keep track of reclaim statistics on a per-pid basis using a loose 3381 * 4-way set associative hash table. Collisions inherit the count of 3382 * the previous entry. 3383 * 3384 * NOTE: We want to be careful here to limit the chain size. If the chain 3385 * size is too large a pid will spread its stats out over too many 3386 * entries under certain types of heavy filesystem activity and 3387 * wind up not delaying long enough. 3388 */ 3389 static 3390 struct hammer_inostats * 3391 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid) 3392 { 3393 struct hammer_inostats *stats; 3394 int delta; 3395 int chain; 3396 static volatile int iterator; /* we don't care about MP races */ 3397 3398 /* 3399 * Chain up to 4 times to find our entry. 3400 */ 3401 for (chain = 0; chain < 4; ++chain) { 3402 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK]; 3403 if (stats->pid == pid) 3404 break; 3405 } 3406 3407 /* 3408 * Replace one of the four chaining entries with our new entry. 3409 */ 3410 if (chain == 4) { 3411 stats = &hmp->inostats[(pid + (iterator++ & 3)) & 3412 HAMMER_INOSTATS_HMASK]; 3413 stats->pid = pid; 3414 } 3415 3416 /* 3417 * Decay the entry 3418 */ 3419 if (stats->count && stats->ltick != ticks) { 3420 delta = ticks - stats->ltick; 3421 stats->ltick = ticks; 3422 if (delta <= 0 || delta > hz * 60) 3423 stats->count = 0; 3424 else 3425 stats->count = stats->count * hz / (hz + delta); 3426 } 3427 if (hammer_debug_general & 0x10000) 3428 hdkprintf("pid %5d stats %d\n", (int)pid, stats->count); 3429 return (stats); 3430 } 3431 3432 #if 0 3433 3434 /* 3435 * XXX not used, doesn't work very well due to the large batching nature 3436 * of flushes. 3437 * 3438 * A larger then normal backlog of inodes is sitting in the flusher, 3439 * enforce a general slowdown to let it catch up. This routine is only 3440 * called on completion of a non-flusher-related transaction which 3441 * performed B-Tree node I/O. 3442 * 3443 * It is possible for the flusher to stall in a continuous load. 3444 * blogbench -i1000 -o seems to do a good job generating this sort of load. 3445 * If the flusher is unable to catch up the inode count can bloat until 3446 * we run out of kvm. 3447 * 3448 * This is a bit of a hack. 3449 */ 3450 void 3451 hammer_inode_waithard(hammer_mount_t hmp) 3452 { 3453 /* 3454 * Hysteresis. 3455 */ 3456 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) { 3457 if (hmp->count_reclaims < hammer_limit_reclaims / 2 && 3458 hmp->count_iqueued < hmp->count_inodes / 20) { 3459 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY; 3460 return; 3461 } 3462 } else { 3463 if (hmp->count_reclaims < hammer_limit_reclaims || 3464 hmp->count_iqueued < hmp->count_inodes / 10) { 3465 return; 3466 } 3467 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY; 3468 } 3469 3470 /* 3471 * Block for one flush cycle. 3472 */ 3473 hammer_flusher_wait_next(hmp); 3474 } 3475 3476 #endif 3477