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 == 341 HAMMER_DEF_LOCALIZATION) 342 vsetflags(vp, VROOT); 343 else 344 vsetflags(vp, VPFSROOT); 345 } else { 346 vsetflags(vp, VPFSROOT); 347 } 348 } 349 350 vp->v_data = (void *)ip; 351 /* vnode locked by getnewvnode() */ 352 /* make related vnode dirty if inode dirty? */ 353 hammer_unlock(&ip->lock); 354 if (vp->v_type == VREG) { 355 vinitvmio(vp, ip->ino_data.size, 356 hammer_blocksize(ip->ino_data.size), 357 hammer_blockoff(ip->ino_data.size)); 358 } 359 break; 360 } 361 362 /* 363 * Interlock vnode clearing. This does not prevent the 364 * vnode from going into a reclaimed state but it does 365 * prevent it from being destroyed or reused so the vget() 366 * will properly fail. 367 */ 368 hammer_lock_ex(&ip->lock); 369 if ((vp = ip->vp) == NULL) { 370 hammer_unlock(&ip->lock); 371 continue; 372 } 373 vhold(vp); 374 hammer_unlock(&ip->lock); 375 376 /* 377 * loop if the vget fails (aka races), or if the vp 378 * no longer matches ip->vp. 379 */ 380 if (vget(vp, LK_EXCLUSIVE) == 0) { 381 if (vp == ip->vp) { 382 vdrop(vp); 383 break; 384 } 385 vput(vp); 386 } 387 vdrop(vp); 388 } 389 *vpp = vp; 390 return(error); 391 } 392 393 /* 394 * Locate all copies of the inode for obj_id compatible with the specified 395 * asof, reference, and issue the related call-back. This routine is used 396 * for direct-io invalidation and does not create any new inodes. 397 */ 398 void 399 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo, 400 int (*callback)(hammer_inode_t ip, void *data), 401 void *data) 402 { 403 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root, 404 hammer_inode_info_cmp_all_history, 405 callback, iinfo); 406 } 407 408 /* 409 * Acquire a HAMMER inode. The returned inode is not locked. These functions 410 * do not attach or detach the related vnode (use hammer_get_vnode() for 411 * that). 412 * 413 * The flags argument is only applied for newly created inodes, and only 414 * certain flags are inherited. 415 * 416 * Called from the frontend. 417 */ 418 struct hammer_inode * 419 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, 420 int64_t obj_id, hammer_tid_t asof, uint32_t localization, 421 int flags, int *errorp) 422 { 423 hammer_mount_t hmp = trans->hmp; 424 struct hammer_node_cache *cachep; 425 struct hammer_cursor cursor; 426 struct hammer_inode *ip; 427 428 429 /* 430 * Determine if we already have an inode cached. If we do then 431 * we are golden. 432 * 433 * If we find an inode with no vnode we have to mark the 434 * transaction such that hammer_inode_waitreclaims() is 435 * called later on to avoid building up an infinite number 436 * of inodes. Otherwise we can continue to * add new inodes 437 * faster then they can be disposed of, even with the tsleep 438 * delay. 439 * 440 * If we find a dummy inode we return a failure so dounlink 441 * (which does another lookup) doesn't try to mess with the 442 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode() 443 * to ref dummy inodes. 444 */ 445 loop: 446 *errorp = 0; 447 ip = __hammer_find_inode(trans, obj_id, asof, localization); 448 if (ip) { 449 if (ip->flags & HAMMER_INODE_DUMMY) { 450 *errorp = ENOENT; 451 return(NULL); 452 } 453 hammer_ref(&ip->lock); 454 return(ip); 455 } 456 457 /* 458 * Allocate a new inode structure and deal with races later. 459 */ 460 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 461 ++hammer_count_inodes; 462 ++hmp->count_inodes; 463 ip->obj_id = obj_id; 464 ip->obj_asof = asof; 465 ip->obj_localization = localization; 466 ip->hmp = hmp; 467 ip->flags = flags & HAMMER_INODE_RO; 468 ip->cache[0].ip = ip; 469 ip->cache[1].ip = ip; 470 ip->cache[2].ip = ip; 471 ip->cache[3].ip = ip; 472 if (hmp->ronly) 473 ip->flags |= HAMMER_INODE_RO; 474 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 475 0x7FFFFFFFFFFFFFFFLL; 476 RB_INIT(&ip->rec_tree); 477 TAILQ_INIT(&ip->target_list); 478 hammer_ref(&ip->lock); 479 480 /* 481 * Locate the on-disk inode. If this is a PFS root we always 482 * access the current version of the root inode and (if it is not 483 * a master) always access information under it with a snapshot 484 * TID. 485 * 486 * We cache recent inode lookups in this directory in dip->cache[2]. 487 * If we can't find it we assume the inode we are looking for is 488 * close to the directory inode. 489 */ 490 retry: 491 cachep = NULL; 492 if (dip) { 493 if (dip->cache[2].node) 494 cachep = &dip->cache[2]; 495 else 496 cachep = &dip->cache[0]; 497 } 498 hammer_init_cursor(trans, &cursor, cachep, NULL); 499 cursor.key_beg.localization = localization | HAMMER_LOCALIZE_INODE; 500 cursor.key_beg.obj_id = ip->obj_id; 501 cursor.key_beg.key = 0; 502 cursor.key_beg.create_tid = 0; 503 cursor.key_beg.delete_tid = 0; 504 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 505 cursor.key_beg.obj_type = 0; 506 507 cursor.asof = asof; 508 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 509 HAMMER_CURSOR_ASOF; 510 511 *errorp = hammer_btree_lookup(&cursor); 512 if (*errorp == EDEADLK) { 513 hammer_done_cursor(&cursor); 514 goto retry; 515 } 516 517 /* 518 * On success the B-Tree lookup will hold the appropriate 519 * buffer cache buffers and provide a pointer to the requested 520 * information. Copy the information to the in-memory inode 521 * and cache the B-Tree node to improve future operations. 522 */ 523 if (*errorp == 0) { 524 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 525 ip->ino_data = cursor.data->inode; 526 527 /* 528 * cache[0] tries to cache the location of the object inode. 529 * The assumption is that it is near the directory inode. 530 * 531 * cache[1] tries to cache the location of the object data. 532 * We might have something in the governing directory from 533 * scan optimizations (see the strategy code in 534 * hammer_vnops.c). 535 * 536 * We update dip->cache[2], if possible, with the location 537 * of the object inode for future directory shortcuts. 538 */ 539 hammer_cache_node(&ip->cache[0], cursor.node); 540 if (dip) { 541 if (dip->cache[3].node) { 542 hammer_cache_node(&ip->cache[1], 543 dip->cache[3].node); 544 } 545 hammer_cache_node(&dip->cache[2], cursor.node); 546 } 547 548 /* 549 * The file should not contain any data past the file size 550 * stored in the inode. Setting save_trunc_off to the 551 * file size instead of max reduces B-Tree lookup overheads 552 * on append by allowing the flusher to avoid checking for 553 * record overwrites. 554 */ 555 ip->save_trunc_off = ip->ino_data.size; 556 557 /* 558 * Locate and assign the pseudofs management structure to 559 * the inode. 560 */ 561 if (dip && dip->obj_localization == ip->obj_localization) { 562 ip->pfsm = dip->pfsm; 563 hammer_ref(&ip->pfsm->lock); 564 } else { 565 ip->pfsm = hammer_load_pseudofs(trans, 566 ip->obj_localization, 567 errorp); 568 *errorp = 0; /* ignore ENOENT */ 569 } 570 } 571 572 /* 573 * The inode is placed on the red-black tree and will be synced to 574 * the media when flushed or by the filesystem sync. If this races 575 * another instantiation/lookup the insertion will fail. 576 */ 577 if (*errorp == 0) { 578 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 579 hammer_free_inode(ip); 580 hammer_done_cursor(&cursor); 581 goto loop; 582 } 583 ip->flags |= HAMMER_INODE_ONDISK; 584 } else { 585 if (ip->flags & HAMMER_INODE_RSV_INODES) { 586 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 587 --hmp->rsv_inodes; 588 } 589 590 hammer_free_inode(ip); 591 ip = NULL; 592 } 593 hammer_done_cursor(&cursor); 594 595 /* 596 * NEWINODE is only set if the inode becomes dirty later, 597 * setting it here just leads to unnecessary stalls. 598 * 599 * trans->flags |= HAMMER_TRANSF_NEWINODE; 600 */ 601 return (ip); 602 } 603 604 /* 605 * Get a dummy inode to placemark a broken directory entry. 606 */ 607 struct hammer_inode * 608 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip, 609 int64_t obj_id, hammer_tid_t asof, uint32_t localization, 610 int flags, int *errorp) 611 { 612 hammer_mount_t hmp = trans->hmp; 613 struct hammer_inode *ip; 614 615 /* 616 * Determine if we already have an inode cached. If we do then 617 * we are golden. 618 * 619 * If we find an inode with no vnode we have to mark the 620 * transaction such that hammer_inode_waitreclaims() is 621 * called later on to avoid building up an infinite number 622 * of inodes. Otherwise we can continue to * add new inodes 623 * faster then they can be disposed of, even with the tsleep 624 * delay. 625 * 626 * If we find a non-fake inode we return an error. Only fake 627 * inodes can be returned by this routine. 628 */ 629 loop: 630 *errorp = 0; 631 ip = __hammer_find_inode(trans, obj_id, asof, localization); 632 if (ip) { 633 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) { 634 *errorp = ENOENT; 635 return(NULL); 636 } 637 hammer_ref(&ip->lock); 638 return(ip); 639 } 640 641 /* 642 * Allocate a new inode structure and deal with races later. 643 */ 644 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 645 ++hammer_count_inodes; 646 ++hmp->count_inodes; 647 ip->obj_id = obj_id; 648 ip->obj_asof = asof; 649 ip->obj_localization = localization; 650 ip->hmp = hmp; 651 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY; 652 ip->cache[0].ip = ip; 653 ip->cache[1].ip = ip; 654 ip->cache[2].ip = ip; 655 ip->cache[3].ip = ip; 656 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 657 0x7FFFFFFFFFFFFFFFLL; 658 RB_INIT(&ip->rec_tree); 659 TAILQ_INIT(&ip->target_list); 660 hammer_ref(&ip->lock); 661 662 /* 663 * Populate the dummy inode. Leave everything zero'd out. 664 * 665 * (ip->ino_leaf and ip->ino_data) 666 * 667 * Make the dummy inode a FIFO object which most copy programs 668 * will properly ignore. 669 */ 670 ip->save_trunc_off = ip->ino_data.size; 671 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO; 672 673 /* 674 * Locate and assign the pseudofs management structure to 675 * the inode. 676 */ 677 if (dip && dip->obj_localization == ip->obj_localization) { 678 ip->pfsm = dip->pfsm; 679 hammer_ref(&ip->pfsm->lock); 680 } else { 681 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization, 682 errorp); 683 *errorp = 0; /* ignore ENOENT */ 684 } 685 686 /* 687 * The inode is placed on the red-black tree and will be synced to 688 * the media when flushed or by the filesystem sync. If this races 689 * another instantiation/lookup the insertion will fail. 690 * 691 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake. 692 */ 693 if (*errorp == 0) { 694 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 695 hammer_free_inode(ip); 696 goto loop; 697 } 698 } else { 699 if (ip->flags & HAMMER_INODE_RSV_INODES) { 700 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 701 --hmp->rsv_inodes; 702 } 703 hammer_free_inode(ip); 704 ip = NULL; 705 } 706 trans->flags |= HAMMER_TRANSF_NEWINODE; 707 return (ip); 708 } 709 710 /* 711 * Return a referenced inode only if it is in our inode cache. 712 * Dummy inodes do not count. 713 */ 714 struct hammer_inode * 715 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 716 hammer_tid_t asof, uint32_t localization) 717 { 718 struct hammer_inode *ip; 719 720 ip = __hammer_find_inode(trans, obj_id, asof, localization); 721 if (ip) { 722 if (ip->flags & HAMMER_INODE_DUMMY) 723 ip = NULL; 724 else 725 hammer_ref(&ip->lock); 726 } 727 return(ip); 728 } 729 730 /* 731 * Return a referenced inode only if it is in our inode cache. 732 * This function does not reference inode. 733 */ 734 static struct hammer_inode * 735 __hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 736 hammer_tid_t asof, uint32_t localization) 737 { 738 hammer_mount_t hmp = trans->hmp; 739 struct hammer_inode_info iinfo; 740 struct hammer_inode *ip; 741 742 iinfo.obj_id = obj_id; 743 iinfo.obj_asof = asof; 744 iinfo.obj_localization = localization; 745 746 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 747 748 return(ip); 749 } 750 751 /* 752 * Create a new filesystem object, returning the inode in *ipp. The 753 * returned inode will be referenced. The inode is created in-memory. 754 * 755 * If pfsm is non-NULL the caller wishes to create the root inode for 756 * a non-root PFS. 757 */ 758 int 759 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 760 struct ucred *cred, 761 hammer_inode_t dip, const char *name, int namelen, 762 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 763 { 764 hammer_mount_t hmp; 765 hammer_inode_t ip; 766 uid_t xuid; 767 int error; 768 int64_t namekey; 769 uint32_t dummy; 770 771 hmp = trans->hmp; 772 773 /* 774 * Disallow the creation of new inodes in directories which 775 * have been deleted. In HAMMER, this will cause a record 776 * syncing assertion later on in the flush code. 777 */ 778 if (dip && dip->ino_data.nlinks == 0) { 779 *ipp = NULL; 780 return (EINVAL); 781 } 782 783 /* 784 * Allocate inode 785 */ 786 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 787 ++hammer_count_inodes; 788 ++hmp->count_inodes; 789 trans->flags |= HAMMER_TRANSF_NEWINODE; 790 791 if (pfsm) { 792 KKASSERT(pfsm->localization != HAMMER_DEF_LOCALIZATION); 793 ip->obj_id = HAMMER_OBJID_ROOT; 794 ip->obj_localization = pfsm->localization; 795 } else { 796 KKASSERT(dip != NULL); 797 namekey = hammer_directory_namekey(dip, name, namelen, &dummy); 798 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey); 799 ip->obj_localization = dip->obj_localization; 800 } 801 802 KKASSERT(ip->obj_id != 0); 803 ip->obj_asof = hmp->asof; 804 ip->hmp = hmp; 805 ip->flush_state = HAMMER_FST_IDLE; 806 ip->flags = HAMMER_INODE_DDIRTY | 807 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 808 ip->cache[0].ip = ip; 809 ip->cache[1].ip = ip; 810 ip->cache[2].ip = ip; 811 ip->cache[3].ip = ip; 812 813 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 814 /* ip->save_trunc_off = 0; (already zero) */ 815 RB_INIT(&ip->rec_tree); 816 TAILQ_INIT(&ip->target_list); 817 818 ip->ino_data.atime = trans->time; 819 ip->ino_data.mtime = trans->time; 820 ip->ino_data.size = 0; 821 ip->ino_data.nlinks = 0; 822 823 /* 824 * A nohistory designator on the parent directory is inherited by 825 * the child. We will do this even for pseudo-fs creation... the 826 * sysad can turn it off. 827 */ 828 if (dip) { 829 ip->ino_data.uflags = dip->ino_data.uflags & 830 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 831 } 832 833 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 834 ip->ino_leaf.base.localization = ip->obj_localization | 835 HAMMER_LOCALIZE_INODE; 836 ip->ino_leaf.base.obj_id = ip->obj_id; 837 ip->ino_leaf.base.key = 0; 838 ip->ino_leaf.base.create_tid = 0; 839 ip->ino_leaf.base.delete_tid = 0; 840 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 841 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 842 843 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 844 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 845 ip->ino_data.mode = vap->va_mode; 846 ip->ino_data.ctime = trans->time; 847 848 /* 849 * If we are running version 2 or greater directory entries are 850 * inode-localized instead of data-localized. 851 */ 852 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 853 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 854 ip->ino_data.cap_flags |= 855 HAMMER_INODE_CAP_DIR_LOCAL_INO; 856 } 857 } 858 if (trans->hmp->version >= HAMMER_VOL_VERSION_SIX) { 859 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 860 ip->ino_data.cap_flags |= 861 HAMMER_INODE_CAP_DIRHASH_ALG1; 862 } 863 } 864 865 /* 866 * Setup the ".." pointer. This only needs to be done for directories 867 * but we do it for all objects as a recovery aid if dip exists. 868 * The inode is probably a PFS root if dip is NULL. 869 */ 870 if (dip) 871 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 872 873 switch(ip->ino_leaf.base.obj_type) { 874 case HAMMER_OBJTYPE_CDEV: 875 case HAMMER_OBJTYPE_BDEV: 876 ip->ino_data.rmajor = vap->va_rmajor; 877 ip->ino_data.rminor = vap->va_rminor; 878 break; 879 default: 880 break; 881 } 882 883 /* 884 * Calculate default uid/gid and overwrite with information from 885 * the vap. 886 */ 887 if (dip) { 888 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 889 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 890 xuid, cred, &vap->va_mode); 891 } else { 892 xuid = 0; 893 } 894 ip->ino_data.mode = vap->va_mode; 895 896 if (vap->va_vaflags & VA_UID_UUID_VALID) 897 ip->ino_data.uid = vap->va_uid_uuid; 898 else if (vap->va_uid != (uid_t)VNOVAL) 899 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 900 else 901 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 902 903 if (vap->va_vaflags & VA_GID_UUID_VALID) 904 ip->ino_data.gid = vap->va_gid_uuid; 905 else if (vap->va_gid != (gid_t)VNOVAL) 906 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 907 else if (dip) 908 ip->ino_data.gid = dip->ino_data.gid; 909 910 hammer_ref(&ip->lock); 911 912 if (pfsm) { 913 ip->pfsm = pfsm; 914 hammer_ref(&pfsm->lock); 915 error = 0; 916 } else if (dip->obj_localization == ip->obj_localization) { 917 ip->pfsm = dip->pfsm; 918 hammer_ref(&ip->pfsm->lock); 919 error = 0; 920 } else { 921 ip->pfsm = hammer_load_pseudofs(trans, 922 ip->obj_localization, 923 &error); 924 error = 0; /* ignore ENOENT */ 925 } 926 927 if (error) { 928 hammer_free_inode(ip); 929 ip = NULL; 930 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 931 hpanic("duplicate obj_id %llx", (long long)ip->obj_id); 932 /* not reached */ 933 hammer_free_inode(ip); 934 } 935 *ipp = ip; 936 return(error); 937 } 938 939 /* 940 * Final cleanup / freeing of an inode structure 941 */ 942 static void 943 hammer_free_inode(hammer_inode_t ip) 944 { 945 struct hammer_mount *hmp; 946 947 hmp = ip->hmp; 948 KKASSERT(hammer_oneref(&ip->lock)); 949 hammer_uncache_node(&ip->cache[0]); 950 hammer_uncache_node(&ip->cache[1]); 951 hammer_uncache_node(&ip->cache[2]); 952 hammer_uncache_node(&ip->cache[3]); 953 hammer_inode_wakereclaims(ip); 954 if (ip->objid_cache) 955 hammer_clear_objid(ip); 956 --hammer_count_inodes; 957 --hmp->count_inodes; 958 if (ip->pfsm) { 959 hammer_rel_pseudofs(hmp, ip->pfsm); 960 ip->pfsm = NULL; 961 } 962 kfree(ip, hmp->m_inodes); 963 } 964 965 /* 966 * Retrieve pseudo-fs data. NULL will never be returned. 967 * 968 * If an error occurs *errorp will be set and a default template is returned, 969 * otherwise *errorp is set to 0. Typically when an error occurs it will 970 * be ENOENT. 971 */ 972 hammer_pseudofs_inmem_t 973 hammer_load_pseudofs(hammer_transaction_t trans, 974 uint32_t localization, int *errorp) 975 { 976 hammer_mount_t hmp = trans->hmp; 977 hammer_inode_t ip; 978 hammer_pseudofs_inmem_t pfsm; 979 struct hammer_cursor cursor; 980 int bytes; 981 982 retry: 983 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 984 if (pfsm) { 985 hammer_ref(&pfsm->lock); 986 *errorp = 0; 987 return(pfsm); 988 } 989 990 /* 991 * PFS records are associated with the root inode (not the PFS root 992 * inode, but the real root). Avoid an infinite recursion if loading 993 * the PFS for the real root. 994 */ 995 if (localization) { 996 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 997 HAMMER_MAX_TID, 998 HAMMER_DEF_LOCALIZATION, 0, errorp); 999 } else { 1000 ip = NULL; 1001 } 1002 1003 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 1004 pfsm->localization = localization; 1005 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 1006 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 1007 1008 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 1009 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION | 1010 HAMMER_LOCALIZE_MISC; 1011 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 1012 cursor.key_beg.create_tid = 0; 1013 cursor.key_beg.delete_tid = 0; 1014 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 1015 cursor.key_beg.obj_type = 0; 1016 cursor.key_beg.key = localization; 1017 cursor.asof = HAMMER_MAX_TID; 1018 cursor.flags |= HAMMER_CURSOR_ASOF; 1019 1020 if (ip) 1021 *errorp = hammer_ip_lookup(&cursor); 1022 else 1023 *errorp = hammer_btree_lookup(&cursor); 1024 if (*errorp == 0) { 1025 *errorp = hammer_ip_resolve_data(&cursor); 1026 if (*errorp == 0) { 1027 if (cursor.data->pfsd.mirror_flags & 1028 HAMMER_PFSD_DELETED) { 1029 *errorp = ENOENT; 1030 } else { 1031 bytes = cursor.leaf->data_len; 1032 if (bytes > sizeof(pfsm->pfsd)) 1033 bytes = sizeof(pfsm->pfsd); 1034 bcopy(cursor.data, &pfsm->pfsd, bytes); 1035 } 1036 } 1037 } 1038 hammer_done_cursor(&cursor); 1039 1040 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 1041 hammer_ref(&pfsm->lock); 1042 if (ip) 1043 hammer_rel_inode(ip, 0); 1044 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 1045 kfree(pfsm, hmp->m_misc); 1046 goto retry; 1047 } 1048 return(pfsm); 1049 } 1050 1051 /* 1052 * Store pseudo-fs data. The backend will automatically delete any prior 1053 * on-disk pseudo-fs data but we have to delete in-memory versions. 1054 */ 1055 int 1056 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 1057 { 1058 struct hammer_cursor cursor; 1059 hammer_record_t record; 1060 hammer_inode_t ip; 1061 int error; 1062 1063 /* 1064 * PFS records are associated with the root inode (not the PFS root 1065 * inode, but the real root). 1066 */ 1067 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1068 HAMMER_DEF_LOCALIZATION, 0, &error); 1069 retry: 1070 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 1071 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 1072 cursor.key_beg.localization = ip->obj_localization | 1073 HAMMER_LOCALIZE_MISC; 1074 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 1075 cursor.key_beg.create_tid = 0; 1076 cursor.key_beg.delete_tid = 0; 1077 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 1078 cursor.key_beg.obj_type = 0; 1079 cursor.key_beg.key = pfsm->localization; 1080 cursor.asof = HAMMER_MAX_TID; 1081 cursor.flags |= HAMMER_CURSOR_ASOF; 1082 1083 /* 1084 * Replace any in-memory version of the record. 1085 */ 1086 error = hammer_ip_lookup(&cursor); 1087 if (error == 0 && hammer_cursor_inmem(&cursor)) { 1088 record = cursor.iprec; 1089 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 1090 KKASSERT(cursor.deadlk_rec == NULL); 1091 hammer_ref(&record->lock); 1092 cursor.deadlk_rec = record; 1093 error = EDEADLK; 1094 } else { 1095 record->flags |= HAMMER_RECF_DELETED_FE; 1096 error = 0; 1097 } 1098 } 1099 1100 /* 1101 * Allocate replacement general record. The backend flush will 1102 * delete any on-disk version of the record. 1103 */ 1104 if (error == 0 || error == ENOENT) { 1105 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 1106 record->type = HAMMER_MEM_RECORD_GENERAL; 1107 1108 record->leaf.base.localization = ip->obj_localization | 1109 HAMMER_LOCALIZE_MISC; 1110 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 1111 record->leaf.base.key = pfsm->localization; 1112 record->leaf.data_len = sizeof(pfsm->pfsd); 1113 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 1114 error = hammer_ip_add_record(trans, record); 1115 } 1116 hammer_done_cursor(&cursor); 1117 if (error == EDEADLK) 1118 goto retry; 1119 hammer_rel_inode(ip, 0); 1120 return(error); 1121 } 1122 1123 /* 1124 * Create a root directory for a PFS if one does not alredy exist. 1125 * 1126 * The PFS root stands alone so we must also bump the nlinks count 1127 * to prevent it from being destroyed on release. 1128 */ 1129 int 1130 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 1131 hammer_pseudofs_inmem_t pfsm) 1132 { 1133 hammer_inode_t ip; 1134 struct vattr vap; 1135 int error; 1136 1137 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1138 pfsm->localization, 0, &error); 1139 if (ip == NULL) { 1140 vattr_null(&vap); 1141 vap.va_mode = 0755; 1142 vap.va_type = VDIR; 1143 error = hammer_create_inode(trans, &vap, cred, 1144 NULL, NULL, 0, 1145 pfsm, &ip); 1146 if (error == 0) { 1147 ++ip->ino_data.nlinks; 1148 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); 1149 } 1150 } 1151 if (ip) 1152 hammer_rel_inode(ip, 0); 1153 return(error); 1154 } 1155 1156 /* 1157 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 1158 * if we are unable to disassociate all the inodes. 1159 */ 1160 static 1161 int 1162 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 1163 { 1164 int res; 1165 1166 hammer_ref(&ip->lock); 1167 if (ip->vp && (ip->vp->v_flag & VPFSROOT)) { 1168 /* 1169 * The hammer pfs-upgrade directive itself might have the 1170 * root of the pfs open. Just allow it. 1171 */ 1172 res = 0; 1173 } else { 1174 /* 1175 * Don't allow any subdirectories or files to be open. 1176 */ 1177 if (hammer_isactive(&ip->lock) == 2 && ip->vp) 1178 vclean_unlocked(ip->vp); 1179 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL) 1180 res = 0; 1181 else 1182 res = -1; /* stop, someone is using the inode */ 1183 } 1184 hammer_rel_inode(ip, 0); 1185 return(res); 1186 } 1187 1188 int 1189 hammer_unload_pseudofs(hammer_transaction_t trans, uint32_t localization) 1190 { 1191 int res; 1192 int try; 1193 1194 for (try = res = 0; try < 4; ++try) { 1195 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 1196 hammer_inode_pfs_cmp, 1197 hammer_unload_pseudofs_callback, 1198 &localization); 1199 if (res == 0 && try > 1) 1200 break; 1201 hammer_flusher_sync(trans->hmp); 1202 } 1203 if (res != 0) 1204 res = ENOTEMPTY; 1205 return(res); 1206 } 1207 1208 1209 /* 1210 * Release a reference on a PFS 1211 */ 1212 void 1213 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 1214 { 1215 hammer_rel(&pfsm->lock); 1216 if (hammer_norefs(&pfsm->lock)) { 1217 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 1218 kfree(pfsm, hmp->m_misc); 1219 } 1220 } 1221 1222 /* 1223 * Called by hammer_sync_inode(). 1224 */ 1225 static int 1226 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 1227 { 1228 hammer_transaction_t trans = cursor->trans; 1229 hammer_record_t record; 1230 int error; 1231 int redirty; 1232 1233 retry: 1234 error = 0; 1235 1236 /* 1237 * If the inode has a presence on-disk then locate it and mark 1238 * it deleted, setting DELONDISK. 1239 * 1240 * The record may or may not be physically deleted, depending on 1241 * the retention policy. 1242 */ 1243 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 1244 HAMMER_INODE_ONDISK) { 1245 hammer_normalize_cursor(cursor); 1246 cursor->key_beg.localization = ip->obj_localization | 1247 HAMMER_LOCALIZE_INODE; 1248 cursor->key_beg.obj_id = ip->obj_id; 1249 cursor->key_beg.key = 0; 1250 cursor->key_beg.create_tid = 0; 1251 cursor->key_beg.delete_tid = 0; 1252 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1253 cursor->key_beg.obj_type = 0; 1254 cursor->asof = ip->obj_asof; 1255 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1256 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 1257 cursor->flags |= HAMMER_CURSOR_BACKEND; 1258 1259 error = hammer_btree_lookup(cursor); 1260 if (hammer_debug_inode) 1261 hdkprintf("IPDEL %p %08x %d", ip, ip->flags, error); 1262 1263 if (error == 0) { 1264 error = hammer_ip_delete_record(cursor, ip, trans->tid); 1265 if (hammer_debug_inode) 1266 hdkprintf("error %d\n", error); 1267 if (error == 0) { 1268 ip->flags |= HAMMER_INODE_DELONDISK; 1269 } 1270 if (cursor->node) 1271 hammer_cache_node(&ip->cache[0], cursor->node); 1272 } 1273 if (error == EDEADLK) { 1274 hammer_done_cursor(cursor); 1275 error = hammer_init_cursor(trans, cursor, 1276 &ip->cache[0], ip); 1277 if (hammer_debug_inode) 1278 hdkprintf("IPDED %p %d\n", ip, error); 1279 if (error == 0) 1280 goto retry; 1281 } 1282 } 1283 1284 /* 1285 * Ok, write out the initial record or a new record (after deleting 1286 * the old one), unless the DELETED flag is set. This routine will 1287 * clear DELONDISK if it writes out a record. 1288 * 1289 * Update our inode statistics if this is the first application of 1290 * the inode on-disk. 1291 */ 1292 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 1293 /* 1294 * Generate a record and write it to the media. We clean-up 1295 * the state before releasing so we do not have to set-up 1296 * a flush_group. 1297 */ 1298 record = hammer_alloc_mem_record(ip, 0); 1299 record->type = HAMMER_MEM_RECORD_INODE; 1300 record->flush_state = HAMMER_FST_FLUSH; 1301 record->leaf = ip->sync_ino_leaf; 1302 record->leaf.base.create_tid = trans->tid; 1303 record->leaf.data_len = sizeof(ip->sync_ino_data); 1304 record->leaf.create_ts = trans->time32; 1305 record->data = (void *)&ip->sync_ino_data; 1306 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1307 1308 /* 1309 * If this flag is set we cannot sync the new file size 1310 * because we haven't finished related truncations. The 1311 * inode will be flushed in another flush group to finish 1312 * the job. 1313 */ 1314 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1315 ip->sync_ino_data.size != ip->ino_data.size) { 1316 redirty = 1; 1317 ip->sync_ino_data.size = ip->ino_data.size; 1318 } else { 1319 redirty = 0; 1320 } 1321 1322 for (;;) { 1323 error = hammer_ip_sync_record_cursor(cursor, record); 1324 if (hammer_debug_inode) 1325 hdkprintf("GENREC %p rec %08x %d\n", 1326 ip, record->flags, error); 1327 if (error != EDEADLK) 1328 break; 1329 hammer_done_cursor(cursor); 1330 error = hammer_init_cursor(trans, cursor, 1331 &ip->cache[0], ip); 1332 if (hammer_debug_inode) 1333 hdkprintf("GENREC reinit %d\n", error); 1334 if (error) 1335 break; 1336 } 1337 1338 /* 1339 * Note: The record was never on the inode's record tree 1340 * so just wave our hands importantly and destroy it. 1341 */ 1342 record->flags |= HAMMER_RECF_COMMITTED; 1343 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1344 record->flush_state = HAMMER_FST_IDLE; 1345 ++ip->rec_generation; 1346 hammer_rel_mem_record(record); 1347 1348 /* 1349 * Finish up. 1350 */ 1351 if (error == 0) { 1352 if (hammer_debug_inode) 1353 hdkprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1354 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1355 HAMMER_INODE_SDIRTY | 1356 HAMMER_INODE_ATIME | 1357 HAMMER_INODE_MTIME); 1358 ip->flags &= ~HAMMER_INODE_DELONDISK; 1359 if (redirty) 1360 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1361 1362 /* 1363 * Root volume count of inodes 1364 */ 1365 hammer_sync_lock_sh(trans); 1366 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1367 hammer_modify_volume_field(trans, 1368 trans->rootvol, 1369 vol0_stat_inodes); 1370 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1371 hammer_modify_volume_done(trans->rootvol); 1372 ip->flags |= HAMMER_INODE_ONDISK; 1373 if (hammer_debug_inode) 1374 hdkprintf("NOWONDISK %p\n", ip); 1375 } 1376 hammer_sync_unlock(trans); 1377 } 1378 } 1379 1380 /* 1381 * If the inode has been destroyed, clean out any left-over flags 1382 * that may have been set by the frontend. 1383 */ 1384 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1385 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1386 HAMMER_INODE_SDIRTY | 1387 HAMMER_INODE_ATIME | 1388 HAMMER_INODE_MTIME); 1389 } 1390 return(error); 1391 } 1392 1393 /* 1394 * Update only the itimes fields. 1395 * 1396 * ATIME can be updated without generating any UNDO. MTIME is updated 1397 * with UNDO so it is guaranteed to be synchronized properly in case of 1398 * a crash. 1399 * 1400 * Neither field is included in the B-Tree leaf element's CRC, which is how 1401 * we can get away with updating ATIME the way we do. 1402 */ 1403 static int 1404 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1405 { 1406 hammer_transaction_t trans = cursor->trans; 1407 int error; 1408 1409 retry: 1410 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1411 HAMMER_INODE_ONDISK) { 1412 return(0); 1413 } 1414 1415 hammer_normalize_cursor(cursor); 1416 cursor->key_beg.localization = ip->obj_localization | 1417 HAMMER_LOCALIZE_INODE; 1418 cursor->key_beg.obj_id = ip->obj_id; 1419 cursor->key_beg.key = 0; 1420 cursor->key_beg.create_tid = 0; 1421 cursor->key_beg.delete_tid = 0; 1422 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1423 cursor->key_beg.obj_type = 0; 1424 cursor->asof = ip->obj_asof; 1425 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1426 cursor->flags |= HAMMER_CURSOR_ASOF; 1427 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1428 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1429 cursor->flags |= HAMMER_CURSOR_BACKEND; 1430 1431 error = hammer_btree_lookup(cursor); 1432 if (error == 0) { 1433 hammer_cache_node(&ip->cache[0], cursor->node); 1434 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1435 /* 1436 * Updating MTIME requires an UNDO. Just cover 1437 * both atime and mtime. 1438 */ 1439 hammer_sync_lock_sh(trans); 1440 hammer_modify_buffer(trans, cursor->data_buffer, 1441 &cursor->data->inode.mtime, 1442 sizeof(cursor->data->inode.atime) + 1443 sizeof(cursor->data->inode.mtime)); 1444 cursor->data->inode.atime = ip->sync_ino_data.atime; 1445 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1446 hammer_modify_buffer_done(cursor->data_buffer); 1447 hammer_sync_unlock(trans); 1448 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1449 /* 1450 * Updating atime only can be done in-place with 1451 * no UNDO. 1452 */ 1453 hammer_sync_lock_sh(trans); 1454 hammer_modify_buffer_noundo(trans, cursor->data_buffer); 1455 cursor->data->inode.atime = ip->sync_ino_data.atime; 1456 hammer_modify_buffer_done(cursor->data_buffer); 1457 hammer_sync_unlock(trans); 1458 } 1459 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1460 } 1461 if (error == EDEADLK) { 1462 hammer_done_cursor(cursor); 1463 error = hammer_init_cursor(trans, cursor, &ip->cache[0], ip); 1464 if (error == 0) 1465 goto retry; 1466 } 1467 return(error); 1468 } 1469 1470 /* 1471 * Release a reference on an inode, flush as requested. 1472 * 1473 * On the last reference we queue the inode to the flusher for its final 1474 * disposition. 1475 */ 1476 void 1477 hammer_rel_inode(struct hammer_inode *ip, int flush) 1478 { 1479 /* 1480 * Handle disposition when dropping the last ref. 1481 */ 1482 for (;;) { 1483 if (hammer_oneref(&ip->lock)) { 1484 /* 1485 * Determine whether on-disk action is needed for 1486 * the inode's final disposition. 1487 */ 1488 KKASSERT(ip->vp == NULL); 1489 hammer_inode_unloadable_check(ip, 0); 1490 if (ip->flags & HAMMER_INODE_MODMASK) { 1491 hammer_flush_inode(ip, 0); 1492 } else if (hammer_oneref(&ip->lock)) { 1493 hammer_unload_inode(ip); 1494 break; 1495 } 1496 } else { 1497 if (flush) 1498 hammer_flush_inode(ip, 0); 1499 1500 /* 1501 * The inode still has multiple refs, try to drop 1502 * one ref. 1503 */ 1504 KKASSERT(hammer_isactive(&ip->lock) >= 1); 1505 if (hammer_isactive(&ip->lock) > 1) { 1506 hammer_rel(&ip->lock); 1507 break; 1508 } 1509 } 1510 } 1511 } 1512 1513 /* 1514 * Unload and destroy the specified inode. Must be called with one remaining 1515 * reference. The reference is disposed of. 1516 * 1517 * The inode must be completely clean. 1518 */ 1519 static int 1520 hammer_unload_inode(struct hammer_inode *ip) 1521 { 1522 hammer_mount_t hmp = ip->hmp; 1523 1524 KASSERT(hammer_oneref(&ip->lock), 1525 ("hammer_unload_inode: %d refs", hammer_isactive(&ip->lock))); 1526 KKASSERT(ip->vp == NULL); 1527 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1528 KKASSERT(ip->cursor_ip_refs == 0); 1529 KKASSERT(hammer_notlocked(&ip->lock)); 1530 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1531 1532 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1533 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1534 1535 if (ip->flags & HAMMER_INODE_RDIRTY) { 1536 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip); 1537 ip->flags &= ~HAMMER_INODE_RDIRTY; 1538 } 1539 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1540 1541 hammer_free_inode(ip); 1542 return(0); 1543 } 1544 1545 /* 1546 * Called during unmounting if a critical error occured. The in-memory 1547 * inode and all related structures are destroyed. 1548 * 1549 * If a critical error did not occur the unmount code calls the standard 1550 * release and asserts that the inode is gone. 1551 */ 1552 int 1553 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1554 { 1555 hammer_record_t rec; 1556 1557 /* 1558 * Get rid of the inodes in-memory records, regardless of their 1559 * state, and clear the mod-mask. 1560 */ 1561 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1562 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1563 rec->target_ip = NULL; 1564 if (rec->flush_state == HAMMER_FST_SETUP) 1565 rec->flush_state = HAMMER_FST_IDLE; 1566 } 1567 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1568 if (rec->flush_state == HAMMER_FST_FLUSH) 1569 --rec->flush_group->refs; 1570 else 1571 hammer_ref(&rec->lock); 1572 KKASSERT(hammer_oneref(&rec->lock)); 1573 rec->flush_state = HAMMER_FST_IDLE; 1574 rec->flush_group = NULL; 1575 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */ 1576 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */ 1577 ++ip->rec_generation; 1578 hammer_rel_mem_record(rec); 1579 } 1580 ip->flags &= ~HAMMER_INODE_MODMASK; 1581 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1582 KKASSERT(ip->vp == NULL); 1583 1584 /* 1585 * Remove the inode from any flush group, force it idle. FLUSH 1586 * and SETUP states have an inode ref. 1587 */ 1588 switch(ip->flush_state) { 1589 case HAMMER_FST_FLUSH: 1590 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 1591 --ip->flush_group->refs; 1592 ip->flush_group = NULL; 1593 /* fall through */ 1594 case HAMMER_FST_SETUP: 1595 hammer_rel(&ip->lock); 1596 ip->flush_state = HAMMER_FST_IDLE; 1597 /* fall through */ 1598 case HAMMER_FST_IDLE: 1599 break; 1600 } 1601 1602 /* 1603 * There shouldn't be any associated vnode. The unload needs at 1604 * least one ref, if we do have a vp steal its ip ref. 1605 */ 1606 if (ip->vp) { 1607 hdkprintf("Unexpected vnode association ip %p vp %p\n", 1608 ip, ip->vp); 1609 ip->vp->v_data = NULL; 1610 ip->vp = NULL; 1611 } else { 1612 hammer_ref(&ip->lock); 1613 } 1614 hammer_unload_inode(ip); 1615 return(0); 1616 } 1617 1618 /* 1619 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1620 * the read-only flag for cached inodes. 1621 * 1622 * This routine is called from a RB_SCAN(). 1623 */ 1624 int 1625 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1626 { 1627 hammer_mount_t hmp = ip->hmp; 1628 1629 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1630 ip->flags |= HAMMER_INODE_RO; 1631 else 1632 ip->flags &= ~HAMMER_INODE_RO; 1633 return(0); 1634 } 1635 1636 /* 1637 * A transaction has modified an inode, requiring updates as specified by 1638 * the passed flags. 1639 * 1640 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime, 1641 * and not including size changes due to write-append 1642 * (but other size changes are included). 1643 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to 1644 * write-append. 1645 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1646 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1647 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1648 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1649 */ 1650 void 1651 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags) 1652 { 1653 /* 1654 * ronly of 0 or 2 does not trigger assertion. 1655 * 2 is a special error state 1656 */ 1657 KKASSERT(ip->hmp->ronly != 1 || 1658 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1659 HAMMER_INODE_SDIRTY | 1660 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1661 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1662 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1663 ip->flags |= HAMMER_INODE_RSV_INODES; 1664 ++ip->hmp->rsv_inodes; 1665 } 1666 1667 /* 1668 * Set the NEWINODE flag in the transaction if the inode 1669 * transitions to a dirty state. This is used to track 1670 * the load on the inode cache. 1671 */ 1672 if (trans && 1673 (ip->flags & HAMMER_INODE_MODMASK) == 0 && 1674 (flags & HAMMER_INODE_MODMASK)) { 1675 trans->flags |= HAMMER_TRANSF_NEWINODE; 1676 } 1677 if (flags & HAMMER_INODE_MODMASK) 1678 hammer_inode_dirty(ip); 1679 ip->flags |= flags; 1680 } 1681 1682 /* 1683 * Attempt to quickly update the atime for a hammer inode. Return 0 on 1684 * success, -1 on failure. 1685 * 1686 * We attempt to update the atime with only the ip lock and not the 1687 * whole filesystem lock in order to improve concurrency. We can only 1688 * do this safely if the ATIME flag is already pending on the inode. 1689 * 1690 * This function is called via a vnops path (ip pointer is stable) without 1691 * fs_token held. 1692 */ 1693 int 1694 hammer_update_atime_quick(hammer_inode_t ip) 1695 { 1696 struct timeval tv; 1697 int res = -1; 1698 1699 if ((ip->flags & HAMMER_INODE_RO) || 1700 (ip->hmp->mp->mnt_flag & MNT_NOATIME)) { 1701 /* 1702 * Silently indicate success on read-only mount/snap 1703 */ 1704 res = 0; 1705 } else if (ip->flags & HAMMER_INODE_ATIME) { 1706 /* 1707 * Double check with inode lock held against backend. This 1708 * is only safe if all we need to do is update 1709 * ino_data.atime. 1710 */ 1711 getmicrotime(&tv); 1712 hammer_lock_ex(&ip->lock); 1713 if (ip->flags & HAMMER_INODE_ATIME) { 1714 ip->ino_data.atime = 1715 (unsigned long)tv.tv_sec * 1000000ULL + tv.tv_usec; 1716 res = 0; 1717 } 1718 hammer_unlock(&ip->lock); 1719 } 1720 return res; 1721 } 1722 1723 /* 1724 * Request that an inode be flushed. This whole mess cannot block and may 1725 * recurse (if not synchronous). Once requested HAMMER will attempt to 1726 * actively flush the inode until the flush can be done. 1727 * 1728 * The inode may already be flushing, or may be in a setup state. We can 1729 * place the inode in a flushing state if it is currently idle and flag it 1730 * to reflush if it is currently flushing. 1731 * 1732 * Upon return if the inode could not be flushed due to a setup 1733 * dependancy, then it will be automatically flushed when the dependancy 1734 * is satisfied. 1735 */ 1736 void 1737 hammer_flush_inode(hammer_inode_t ip, int flags) 1738 { 1739 hammer_mount_t hmp; 1740 hammer_flush_group_t flg; 1741 int good; 1742 1743 /* 1744 * fill_flush_group is the first flush group we may be able to 1745 * continue filling, it may be open or closed but it will always 1746 * be past the currently flushing (running) flg. 1747 * 1748 * next_flush_group is the next open flush group. 1749 */ 1750 hmp = ip->hmp; 1751 while ((flg = hmp->fill_flush_group) != NULL) { 1752 KKASSERT(flg->running == 0); 1753 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit && 1754 flg->total_count <= hammer_autoflush) { 1755 break; 1756 } 1757 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry); 1758 hammer_flusher_async(ip->hmp, flg); 1759 } 1760 if (flg == NULL) { 1761 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1762 flg->seq = hmp->flusher.next++; 1763 if (hmp->next_flush_group == NULL) 1764 hmp->next_flush_group = flg; 1765 if (hmp->fill_flush_group == NULL) 1766 hmp->fill_flush_group = flg; 1767 RB_INIT(&flg->flush_tree); 1768 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1769 } 1770 1771 /* 1772 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1773 * state we have to put it back into an IDLE state so we can 1774 * drop the extra ref. 1775 * 1776 * If we have a parent dependancy we must still fall through 1777 * so we can run it. 1778 */ 1779 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1780 if (ip->flush_state == HAMMER_FST_SETUP && 1781 TAILQ_EMPTY(&ip->target_list)) { 1782 ip->flush_state = HAMMER_FST_IDLE; 1783 hammer_rel_inode(ip, 0); 1784 } 1785 if (ip->flush_state == HAMMER_FST_IDLE) 1786 return; 1787 } 1788 1789 /* 1790 * Our flush action will depend on the current state. 1791 */ 1792 switch(ip->flush_state) { 1793 case HAMMER_FST_IDLE: 1794 /* 1795 * We have no dependancies and can flush immediately. Some 1796 * our children may not be flushable so we have to re-test 1797 * with that additional knowledge. 1798 */ 1799 hammer_flush_inode_core(ip, flg, flags); 1800 break; 1801 case HAMMER_FST_SETUP: 1802 /* 1803 * Recurse upwards through dependancies via target_list 1804 * and start their flusher actions going if possible. 1805 * 1806 * 'good' is our connectivity. -1 means we have none and 1807 * can't flush, 0 means there weren't any dependancies, and 1808 * 1 means we have good connectivity. 1809 */ 1810 good = hammer_setup_parent_inodes(ip, 0, flg); 1811 1812 if (good >= 0) { 1813 /* 1814 * We can continue if good >= 0. Determine how 1815 * many records under our inode can be flushed (and 1816 * mark them). 1817 */ 1818 hammer_flush_inode_core(ip, flg, flags); 1819 } else { 1820 /* 1821 * Parent has no connectivity, tell it to flush 1822 * us as soon as it does. 1823 * 1824 * The REFLUSH flag is also needed to trigger 1825 * dependancy wakeups. 1826 */ 1827 ip->flags |= HAMMER_INODE_CONN_DOWN | 1828 HAMMER_INODE_REFLUSH; 1829 if (flags & HAMMER_FLUSH_SIGNAL) { 1830 ip->flags |= HAMMER_INODE_RESIGNAL; 1831 hammer_flusher_async(ip->hmp, flg); 1832 } 1833 } 1834 break; 1835 case HAMMER_FST_FLUSH: 1836 /* 1837 * We are already flushing, flag the inode to reflush 1838 * if needed after it completes its current flush. 1839 * 1840 * The REFLUSH flag is also needed to trigger 1841 * dependancy wakeups. 1842 */ 1843 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1844 ip->flags |= HAMMER_INODE_REFLUSH; 1845 if (flags & HAMMER_FLUSH_SIGNAL) { 1846 ip->flags |= HAMMER_INODE_RESIGNAL; 1847 hammer_flusher_async(ip->hmp, flg); 1848 } 1849 break; 1850 } 1851 } 1852 1853 /* 1854 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1855 * ip which reference our ip. 1856 * 1857 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1858 * so for now do not ref/deref the structures. Note that if we use the 1859 * ref/rel code later, the rel CAN block. 1860 */ 1861 static int 1862 hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 1863 hammer_flush_group_t flg) 1864 { 1865 hammer_record_t depend; 1866 int good; 1867 int r; 1868 1869 /* 1870 * If we hit our recursion limit and we have parent dependencies 1871 * We cannot continue. Returning < 0 will cause us to be flagged 1872 * for reflush. Returning -2 cuts off additional dependency checks 1873 * because they are likely to also hit the depth limit. 1874 * 1875 * We cannot return < 0 if there are no dependencies or there might 1876 * not be anything to wakeup (ip). 1877 */ 1878 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) { 1879 if (hammer_debug_general & 0x10000) 1880 hkrateprintf(&hammer_gen_krate, 1881 "Warning: depth limit reached on " 1882 "setup recursion, inode %p %016llx\n", 1883 ip, (long long)ip->obj_id); 1884 return(-2); 1885 } 1886 1887 /* 1888 * Scan dependencies 1889 */ 1890 good = 0; 1891 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1892 r = hammer_setup_parent_inodes_helper(depend, depth, flg); 1893 KKASSERT(depend->target_ip == ip); 1894 if (r < 0 && good == 0) 1895 good = -1; 1896 if (r > 0) 1897 good = 1; 1898 1899 /* 1900 * If we failed due to the recursion depth limit then stop 1901 * now. 1902 */ 1903 if (r == -2) 1904 break; 1905 } 1906 return(good); 1907 } 1908 1909 /* 1910 * This helper function takes a record representing the dependancy between 1911 * the parent inode and child inode. 1912 * 1913 * record = record in question (*rec in below) 1914 * record->ip = parent inode (*pip in below) 1915 * record->target_ip = child inode (*ip in below) 1916 * 1917 * *pip--------------\ 1918 * ^ \rec_tree 1919 * \ \ 1920 * \ip /\\\\\ rbtree of recs from parent inode's view 1921 * \ //\\\\\\ 1922 * \ / ........ 1923 * \ / 1924 * \------*rec------target_ip------>*ip 1925 * ...target_entry<----...----->target_list<---... 1926 * list of recs from inode's view 1927 * 1928 * We are asked to recurse upwards and convert the record from SETUP 1929 * to FLUSH if possible. 1930 * 1931 * Return 1 if the record gives us connectivity 1932 * 1933 * Return 0 if the record is not relevant 1934 * 1935 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1936 */ 1937 static int 1938 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth, 1939 hammer_flush_group_t flg) 1940 { 1941 hammer_inode_t pip; 1942 int good; 1943 1944 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1945 pip = record->ip; 1946 1947 /* 1948 * If the record is already flushing, is it in our flush group? 1949 * 1950 * If it is in our flush group but it is a general record or a 1951 * delete-on-disk, it does not improve our connectivity (return 0), 1952 * and if the target inode is not trying to destroy itself we can't 1953 * allow the operation yet anyway (the second return -1). 1954 */ 1955 if (record->flush_state == HAMMER_FST_FLUSH) { 1956 /* 1957 * If not in our flush group ask the parent to reflush 1958 * us as soon as possible. 1959 */ 1960 if (record->flush_group != flg) { 1961 pip->flags |= HAMMER_INODE_REFLUSH; 1962 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1963 return(-1); 1964 } 1965 1966 /* 1967 * If in our flush group everything is already set up, 1968 * just return whether the record will improve our 1969 * visibility or not. 1970 */ 1971 if (record->type == HAMMER_MEM_RECORD_ADD) 1972 return(1); 1973 return(0); 1974 } 1975 1976 /* 1977 * It must be a setup record. Try to resolve the setup dependancies 1978 * by recursing upwards so we can place ip on the flush list. 1979 * 1980 * Limit ourselves to 20 levels of recursion to avoid blowing out 1981 * the kernel stack. If we hit the recursion limit we can't flush 1982 * until the parent flushes. The parent will flush independantly 1983 * on its own and ultimately a deep recursion will be resolved. 1984 */ 1985 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1986 1987 good = hammer_setup_parent_inodes(pip, depth + 1, flg); 1988 1989 /* 1990 * If good < 0 the parent has no connectivity and we cannot safely 1991 * flush the directory entry, which also means we can't flush our 1992 * ip. Flag us for downward recursion once the parent's 1993 * connectivity is resolved. Flag the parent for [re]flush or it 1994 * may not check for downward recursions. 1995 */ 1996 if (good < 0) { 1997 pip->flags |= HAMMER_INODE_REFLUSH; 1998 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1999 return(good); 2000 } 2001 2002 /* 2003 * We are go, place the parent inode in a flushing state so we can 2004 * place its record in a flushing state. Note that the parent 2005 * may already be flushing. The record must be in the same flush 2006 * group as the parent. 2007 */ 2008 if (pip->flush_state != HAMMER_FST_FLUSH) 2009 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 2010 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 2011 2012 /* 2013 * It is possible for a rename to create a loop in the recursion 2014 * and revisit a record. This will result in the record being 2015 * placed in a flush state unexpectedly. This check deals with 2016 * the case. 2017 */ 2018 if (record->flush_state == HAMMER_FST_FLUSH) { 2019 if (record->type == HAMMER_MEM_RECORD_ADD) 2020 return(1); 2021 return(0); 2022 } 2023 2024 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 2025 2026 #if 0 2027 if (record->type == HAMMER_MEM_RECORD_DEL && 2028 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 2029 /* 2030 * Regardless of flushing state we cannot sync this path if the 2031 * record represents a delete-on-disk but the target inode 2032 * is not ready to sync its own deletion. 2033 * 2034 * XXX need to count effective nlinks to determine whether 2035 * the flush is ok, otherwise removing a hardlink will 2036 * just leave the DEL record to rot. 2037 */ 2038 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 2039 return(-1); 2040 } else 2041 #endif 2042 if (pip->flush_group == flg) { 2043 /* 2044 * Because we have not calculated nlinks yet we can just 2045 * set records to the flush state if the parent is in 2046 * the same flush group as we are. 2047 */ 2048 record->flush_state = HAMMER_FST_FLUSH; 2049 record->flush_group = flg; 2050 ++record->flush_group->refs; 2051 hammer_ref(&record->lock); 2052 2053 /* 2054 * A general directory-add contributes to our visibility. 2055 * 2056 * Otherwise it is probably a directory-delete or 2057 * delete-on-disk record and does not contribute to our 2058 * visbility (but we can still flush it). 2059 */ 2060 if (record->type == HAMMER_MEM_RECORD_ADD) 2061 return(1); 2062 return(0); 2063 } else { 2064 /* 2065 * If the parent is not in our flush group we cannot 2066 * flush this record yet, there is no visibility. 2067 * We tell the parent to reflush and mark ourselves 2068 * so the parent knows it should flush us too. 2069 */ 2070 pip->flags |= HAMMER_INODE_REFLUSH; 2071 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 2072 return(-1); 2073 } 2074 } 2075 2076 /* 2077 * This is the core routine placing an inode into the FST_FLUSH state. 2078 */ 2079 static void 2080 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 2081 { 2082 hammer_mount_t hmp = ip->hmp; 2083 int go_count; 2084 2085 /* 2086 * Set flush state and prevent the flusher from cycling into 2087 * the next flush group. Do not place the ip on the list yet. 2088 * Inodes not in the idle state get an extra reference. 2089 */ 2090 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 2091 if (ip->flush_state == HAMMER_FST_IDLE) 2092 hammer_ref(&ip->lock); 2093 ip->flush_state = HAMMER_FST_FLUSH; 2094 ip->flush_group = flg; 2095 ++hmp->flusher.group_lock; 2096 ++hmp->count_iqueued; 2097 ++hammer_count_iqueued; 2098 ++flg->total_count; 2099 hammer_redo_fifo_start_flush(ip); 2100 2101 #if 0 2102 /* 2103 * We need to be able to vfsync/truncate from the backend. 2104 * 2105 * XXX Any truncation from the backend will acquire the vnode 2106 * independently. 2107 */ 2108 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 2109 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 2110 ip->flags |= HAMMER_INODE_VHELD; 2111 vref(ip->vp); 2112 } 2113 #endif 2114 2115 /* 2116 * Figure out how many in-memory records we can actually flush 2117 * (not including inode meta-data, buffers, etc). 2118 */ 2119 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 2120 if (flags & HAMMER_FLUSH_RECURSION) { 2121 /* 2122 * If this is a upwards recursion we do not want to 2123 * recurse down again! 2124 */ 2125 go_count = 1; 2126 #if 0 2127 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2128 /* 2129 * No new records are added if we must complete a flush 2130 * from a previous cycle, but we do have to move the records 2131 * from the previous cycle to the current one. 2132 */ 2133 #if 0 2134 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2135 hammer_syncgrp_child_callback, NULL); 2136 #endif 2137 go_count = 1; 2138 #endif 2139 } else { 2140 /* 2141 * Normal flush, scan records and bring them into the flush. 2142 * Directory adds and deletes are usually skipped (they are 2143 * grouped with the related inode rather then with the 2144 * directory). 2145 * 2146 * go_count can be negative, which means the scan aborted 2147 * due to the flush group being over-full and we should 2148 * flush what we have. 2149 */ 2150 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2151 hammer_setup_child_callback, NULL); 2152 } 2153 2154 /* 2155 * This is a more involved test that includes go_count. If we 2156 * can't flush, flag the inode and return. If go_count is 0 we 2157 * were are unable to flush any records in our rec_tree and 2158 * must ignore the XDIRTY flag. 2159 */ 2160 if (go_count == 0) { 2161 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 2162 --hmp->count_iqueued; 2163 --hammer_count_iqueued; 2164 2165 --flg->total_count; 2166 ip->flush_state = HAMMER_FST_SETUP; 2167 ip->flush_group = NULL; 2168 if (flags & HAMMER_FLUSH_SIGNAL) { 2169 ip->flags |= HAMMER_INODE_REFLUSH | 2170 HAMMER_INODE_RESIGNAL; 2171 } else { 2172 ip->flags |= HAMMER_INODE_REFLUSH; 2173 } 2174 #if 0 2175 if (ip->flags & HAMMER_INODE_VHELD) { 2176 ip->flags &= ~HAMMER_INODE_VHELD; 2177 vrele(ip->vp); 2178 } 2179 #endif 2180 2181 /* 2182 * REFLUSH is needed to trigger dependancy wakeups 2183 * when an inode is in SETUP. 2184 */ 2185 ip->flags |= HAMMER_INODE_REFLUSH; 2186 if (--hmp->flusher.group_lock == 0) 2187 wakeup(&hmp->flusher.group_lock); 2188 return; 2189 } 2190 } 2191 2192 /* 2193 * Snapshot the state of the inode for the backend flusher. 2194 * 2195 * We continue to retain save_trunc_off even when all truncations 2196 * have been resolved as an optimization to determine if we can 2197 * skip the B-Tree lookup for overwrite deletions. 2198 * 2199 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 2200 * and stays in ip->flags. Once set, it stays set until the 2201 * inode is destroyed. 2202 */ 2203 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2204 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 2205 ip->sync_trunc_off = ip->trunc_off; 2206 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 2207 ip->flags &= ~HAMMER_INODE_TRUNCATED; 2208 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 2209 2210 /* 2211 * The save_trunc_off used to cache whether the B-Tree 2212 * holds any records past that point is not used until 2213 * after the truncation has succeeded, so we can safely 2214 * set it now. 2215 */ 2216 if (ip->save_trunc_off > ip->sync_trunc_off) 2217 ip->save_trunc_off = ip->sync_trunc_off; 2218 } 2219 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 2220 ~HAMMER_INODE_TRUNCATED); 2221 ip->sync_ino_leaf = ip->ino_leaf; 2222 ip->sync_ino_data = ip->ino_data; 2223 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 2224 2225 /* 2226 * The flusher list inherits our inode and reference. 2227 */ 2228 KKASSERT(flg->running == 0); 2229 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip); 2230 if (--hmp->flusher.group_lock == 0) 2231 wakeup(&hmp->flusher.group_lock); 2232 2233 /* 2234 * Auto-flush the group if it grows too large. Make sure the 2235 * inode reclaim wait pipeline continues to work. 2236 */ 2237 if (flg->total_count >= hammer_autoflush || 2238 flg->total_count >= hammer_limit_reclaims / 4) { 2239 if (hmp->fill_flush_group == flg) 2240 hmp->fill_flush_group = TAILQ_NEXT(flg, flush_entry); 2241 hammer_flusher_async(hmp, flg); 2242 } 2243 } 2244 2245 /* 2246 * Callback for scan of ip->rec_tree. Try to include each record in our 2247 * flush. ip->flush_group has been set but the inode has not yet been 2248 * moved into a flushing state. 2249 * 2250 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 2251 * both inodes. 2252 * 2253 * We return 1 for any record placed or found in FST_FLUSH, which prevents 2254 * the caller from shortcutting the flush. 2255 */ 2256 static int 2257 hammer_setup_child_callback(hammer_record_t rec, void *data) 2258 { 2259 hammer_flush_group_t flg; 2260 hammer_inode_t target_ip; 2261 hammer_inode_t ip; 2262 int r; 2263 2264 /* 2265 * Records deleted or committed by the backend are ignored. 2266 * Note that the flush detects deleted frontend records at 2267 * multiple points to deal with races. This is just the first 2268 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot 2269 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it 2270 * messes up link-count calculations. 2271 * 2272 * NOTE: Don't get confused between record deletion and, say, 2273 * directory entry deletion. The deletion of a directory entry 2274 * which is on-media has nothing to do with the record deletion 2275 * flags. 2276 */ 2277 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 2278 HAMMER_RECF_COMMITTED)) { 2279 if (rec->flush_state == HAMMER_FST_FLUSH) { 2280 KKASSERT(rec->flush_group == rec->ip->flush_group); 2281 r = 1; 2282 } else { 2283 r = 0; 2284 } 2285 return(r); 2286 } 2287 2288 /* 2289 * If the record is in an idle state it has no dependancies and 2290 * can be flushed. 2291 */ 2292 ip = rec->ip; 2293 flg = ip->flush_group; 2294 r = 0; 2295 2296 switch(rec->flush_state) { 2297 case HAMMER_FST_IDLE: 2298 /* 2299 * The record has no setup dependancy, we can flush it. 2300 */ 2301 KKASSERT(rec->target_ip == NULL); 2302 rec->flush_state = HAMMER_FST_FLUSH; 2303 rec->flush_group = flg; 2304 ++flg->refs; 2305 hammer_ref(&rec->lock); 2306 r = 1; 2307 break; 2308 case HAMMER_FST_SETUP: 2309 /* 2310 * The record has a setup dependancy. These are typically 2311 * directory entry adds and deletes. Such entries will be 2312 * flushed when their inodes are flushed so we do not 2313 * usually have to add them to the flush here. However, 2314 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 2315 * it is asking us to flush this record (and it). 2316 */ 2317 target_ip = rec->target_ip; 2318 KKASSERT(target_ip != NULL); 2319 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 2320 2321 /* 2322 * If the target IP is already flushing in our group 2323 * we could associate the record, but target_ip has 2324 * already synced ino_data to sync_ino_data and we 2325 * would also have to adjust nlinks. Plus there are 2326 * ordering issues for adds and deletes. 2327 * 2328 * Reflush downward if this is an ADD, and upward if 2329 * this is a DEL. 2330 */ 2331 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 2332 if (rec->type == HAMMER_MEM_RECORD_ADD) 2333 ip->flags |= HAMMER_INODE_REFLUSH; 2334 else 2335 target_ip->flags |= HAMMER_INODE_REFLUSH; 2336 break; 2337 } 2338 2339 /* 2340 * Target IP is not yet flushing. This can get complex 2341 * because we have to be careful about the recursion. 2342 * 2343 * Directories create an issue for us in that if a flush 2344 * of a directory is requested the expectation is to flush 2345 * any pending directory entries, but this will cause the 2346 * related inodes to recursively flush as well. We can't 2347 * really defer the operation so just get as many as we 2348 * can and 2349 */ 2350 #if 0 2351 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 2352 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 2353 /* 2354 * We aren't reclaiming and the target ip was not 2355 * previously prevented from flushing due to this 2356 * record dependancy. Do not flush this record. 2357 */ 2358 /*r = 0;*/ 2359 } else 2360 #endif 2361 if (flg->total_count + flg->refs > 2362 ip->hmp->undo_rec_limit) { 2363 /* 2364 * Our flush group is over-full and we risk blowing 2365 * out the UNDO FIFO. Stop the scan, flush what we 2366 * have, then reflush the directory. 2367 * 2368 * The directory may be forced through multiple 2369 * flush groups before it can be completely 2370 * flushed. 2371 */ 2372 ip->flags |= HAMMER_INODE_RESIGNAL | 2373 HAMMER_INODE_REFLUSH; 2374 r = -1; 2375 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 2376 /* 2377 * If the target IP is not flushing we can force 2378 * it to flush, even if it is unable to write out 2379 * any of its own records we have at least one in 2380 * hand that we CAN deal with. 2381 */ 2382 rec->flush_state = HAMMER_FST_FLUSH; 2383 rec->flush_group = flg; 2384 ++flg->refs; 2385 hammer_ref(&rec->lock); 2386 hammer_flush_inode_core(target_ip, flg, 2387 HAMMER_FLUSH_RECURSION); 2388 r = 1; 2389 } else { 2390 /* 2391 * General or delete-on-disk record. 2392 * 2393 * XXX this needs help. If a delete-on-disk we could 2394 * disconnect the target. If the target has its own 2395 * dependancies they really need to be flushed. 2396 * 2397 * XXX 2398 */ 2399 rec->flush_state = HAMMER_FST_FLUSH; 2400 rec->flush_group = flg; 2401 ++flg->refs; 2402 hammer_ref(&rec->lock); 2403 hammer_flush_inode_core(target_ip, flg, 2404 HAMMER_FLUSH_RECURSION); 2405 r = 1; 2406 } 2407 break; 2408 case HAMMER_FST_FLUSH: 2409 /* 2410 * The record could be part of a previous flush group if the 2411 * inode is a directory (the record being a directory entry). 2412 * Once the flush group was closed a hammer_test_inode() 2413 * function can cause a new flush group to be setup, placing 2414 * the directory inode itself in a new flush group. 2415 * 2416 * When associated with a previous flush group we count it 2417 * as if it were in our current flush group, since it will 2418 * effectively be flushed by the time we flush our current 2419 * flush group. 2420 */ 2421 KKASSERT( 2422 rec->ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY || 2423 rec->flush_group == flg); 2424 r = 1; 2425 break; 2426 } 2427 return(r); 2428 } 2429 2430 #if 0 2431 /* 2432 * This version just moves records already in a flush state to the new 2433 * flush group and that is it. 2434 */ 2435 static int 2436 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 2437 { 2438 hammer_inode_t ip = rec->ip; 2439 2440 switch(rec->flush_state) { 2441 case HAMMER_FST_FLUSH: 2442 KKASSERT(rec->flush_group == ip->flush_group); 2443 break; 2444 default: 2445 break; 2446 } 2447 return(0); 2448 } 2449 #endif 2450 2451 /* 2452 * Wait for a previously queued flush to complete. 2453 * 2454 * If a critical error occured we don't try to wait. 2455 */ 2456 void 2457 hammer_wait_inode(hammer_inode_t ip) 2458 { 2459 /* 2460 * The inode can be in a SETUP state in which case RESIGNAL 2461 * should be set. If RESIGNAL is not set then the previous 2462 * flush completed and a later operation placed the inode 2463 * in a passive setup state again, so we're done. 2464 * 2465 * The inode can be in a FLUSH state in which case we 2466 * can just wait for completion. 2467 */ 2468 while (ip->flush_state == HAMMER_FST_FLUSH || 2469 (ip->flush_state == HAMMER_FST_SETUP && 2470 (ip->flags & HAMMER_INODE_RESIGNAL))) { 2471 /* 2472 * Don't try to flush on a critical error 2473 */ 2474 if (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) 2475 break; 2476 2477 /* 2478 * If the inode was already being flushed its flg 2479 * may not have been queued to the backend. We 2480 * have to make sure it gets queued or we can wind 2481 * up blocked or deadlocked (particularly if we are 2482 * the vnlru thread). 2483 */ 2484 if (ip->flush_state == HAMMER_FST_FLUSH) { 2485 KKASSERT(ip->flush_group); 2486 if (ip->flush_group->closed == 0) { 2487 if (hammer_debug_inode) { 2488 hkprintf("debug: forcing " 2489 "async flush ip %016jx\n", 2490 (intmax_t)ip->obj_id); 2491 } 2492 hammer_flusher_async(ip->hmp, ip->flush_group); 2493 continue; /* retest */ 2494 } 2495 } 2496 2497 /* 2498 * In a flush state with the flg queued to the backend 2499 * or in a setup state with RESIGNAL set, we can safely 2500 * wait. 2501 */ 2502 ip->flags |= HAMMER_INODE_FLUSHW; 2503 tsleep(&ip->flags, 0, "hmrwin", 0); 2504 } 2505 2506 #if 0 2507 /* 2508 * The inode may have been in a passive setup state, 2509 * call flush to make sure we get signaled. 2510 */ 2511 if (ip->flush_state == HAMMER_FST_SETUP) 2512 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2513 #endif 2514 2515 } 2516 2517 /* 2518 * Called by the backend code when a flush has been completed. 2519 * The inode has already been removed from the flush list. 2520 * 2521 * A pipelined flush can occur, in which case we must re-enter the 2522 * inode on the list and re-copy its fields. 2523 */ 2524 void 2525 hammer_flush_inode_done(hammer_inode_t ip, int error) 2526 { 2527 hammer_mount_t hmp; 2528 int dorel; 2529 2530 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2531 2532 hmp = ip->hmp; 2533 2534 /* 2535 * Auto-reflush if the backend could not completely flush 2536 * the inode. This fixes a case where a deferred buffer flush 2537 * could cause fsync to return early. 2538 */ 2539 if (ip->sync_flags & HAMMER_INODE_MODMASK) 2540 ip->flags |= HAMMER_INODE_REFLUSH; 2541 2542 /* 2543 * Merge left-over flags back into the frontend and fix the state. 2544 * Incomplete truncations are retained by the backend. 2545 */ 2546 ip->error = error; 2547 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2548 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2549 2550 /* 2551 * The backend may have adjusted nlinks, so if the adjusted nlinks 2552 * does not match the fronttend set the frontend's DDIRTY flag again. 2553 */ 2554 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2555 ip->flags |= HAMMER_INODE_DDIRTY; 2556 2557 /* 2558 * Fix up the dirty buffer status. 2559 */ 2560 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2561 ip->flags |= HAMMER_INODE_BUFS; 2562 } 2563 hammer_redo_fifo_end_flush(ip); 2564 2565 /* 2566 * Re-set the XDIRTY flag if some of the inode's in-memory records 2567 * could not be flushed. 2568 */ 2569 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2570 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2571 (!RB_EMPTY(&ip->rec_tree) && 2572 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2573 2574 /* 2575 * Do not lose track of inodes which no longer have vnode 2576 * assocations, otherwise they may never get flushed again. 2577 * 2578 * The reflush flag can be set superfluously, causing extra pain 2579 * for no reason. If the inode is no longer modified it no longer 2580 * needs to be flushed. 2581 */ 2582 if (ip->flags & HAMMER_INODE_MODMASK) { 2583 if (ip->vp == NULL) 2584 ip->flags |= HAMMER_INODE_REFLUSH; 2585 } else { 2586 ip->flags &= ~HAMMER_INODE_REFLUSH; 2587 } 2588 2589 /* 2590 * The fs token is held but the inode lock is not held. Because this 2591 * is a backend flush it is possible that the vnode has no references 2592 * and cause a reclaim race inside vsetisdirty() if/when it blocks. 2593 * 2594 * Therefore, we must lock the inode around this particular dirtying 2595 * operation. We don't have to around other dirtying operations 2596 * where the vnode is implicitly or explicitly held. 2597 */ 2598 if (ip->flags & HAMMER_INODE_MODMASK) { 2599 hammer_lock_ex(&ip->lock); 2600 hammer_inode_dirty(ip); 2601 hammer_unlock(&ip->lock); 2602 } 2603 2604 /* 2605 * Adjust the flush state. 2606 */ 2607 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2608 /* 2609 * We were unable to flush out all our records, leave the 2610 * inode in a flush state and in the current flush group. 2611 * The flush group will be re-run. 2612 * 2613 * This occurs if the UNDO block gets too full or there is 2614 * too much dirty meta-data and allows the flusher to 2615 * finalize the UNDO block and then re-flush. 2616 */ 2617 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2618 dorel = 0; 2619 } else { 2620 /* 2621 * Remove from the flush_group 2622 */ 2623 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 2624 ip->flush_group = NULL; 2625 2626 #if 0 2627 /* 2628 * Clean up the vnode ref and tracking counts. 2629 */ 2630 if (ip->flags & HAMMER_INODE_VHELD) { 2631 ip->flags &= ~HAMMER_INODE_VHELD; 2632 vrele(ip->vp); 2633 } 2634 #endif 2635 --hmp->count_iqueued; 2636 --hammer_count_iqueued; 2637 2638 /* 2639 * And adjust the state. 2640 */ 2641 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2642 ip->flush_state = HAMMER_FST_IDLE; 2643 dorel = 1; 2644 } else { 2645 ip->flush_state = HAMMER_FST_SETUP; 2646 dorel = 0; 2647 } 2648 2649 /* 2650 * If the frontend is waiting for a flush to complete, 2651 * wake it up. 2652 */ 2653 if (ip->flags & HAMMER_INODE_FLUSHW) { 2654 ip->flags &= ~HAMMER_INODE_FLUSHW; 2655 wakeup(&ip->flags); 2656 } 2657 2658 /* 2659 * If the frontend made more changes and requested another 2660 * flush, then try to get it running. 2661 * 2662 * Reflushes are aborted when the inode is errored out. 2663 */ 2664 if (ip->flags & HAMMER_INODE_REFLUSH) { 2665 ip->flags &= ~HAMMER_INODE_REFLUSH; 2666 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2667 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2668 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2669 } else { 2670 hammer_flush_inode(ip, 0); 2671 } 2672 } 2673 } 2674 2675 /* 2676 * If we have no parent dependancies we can clear CONN_DOWN 2677 */ 2678 if (TAILQ_EMPTY(&ip->target_list)) 2679 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2680 2681 /* 2682 * If the inode is now clean drop the space reservation. 2683 */ 2684 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2685 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2686 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2687 --hmp->rsv_inodes; 2688 } 2689 2690 ip->flags &= ~HAMMER_INODE_SLAVEFLUSH; 2691 2692 if (dorel) 2693 hammer_rel_inode(ip, 0); 2694 } 2695 2696 /* 2697 * Called from hammer_sync_inode() to synchronize in-memory records 2698 * to the media. 2699 */ 2700 static int 2701 hammer_sync_record_callback(hammer_record_t record, void *data) 2702 { 2703 hammer_cursor_t cursor = data; 2704 hammer_transaction_t trans = cursor->trans; 2705 hammer_mount_t hmp = trans->hmp; 2706 int error; 2707 2708 /* 2709 * Skip records that do not belong to the current flush. 2710 */ 2711 ++hammer_stats_record_iterations; 2712 if (record->flush_state != HAMMER_FST_FLUSH) 2713 return(0); 2714 2715 if (record->flush_group != record->ip->flush_group) { 2716 hdkprintf("rec %p ip %p bad flush group %p %p\n", 2717 record, 2718 record->ip, 2719 record->flush_group, 2720 record->ip->flush_group); 2721 if (hammer_debug_critical) 2722 Debugger("blah2"); 2723 return(0); 2724 } 2725 KKASSERT(record->flush_group == record->ip->flush_group); 2726 2727 /* 2728 * Interlock the record using the BE flag. Once BE is set the 2729 * frontend cannot change the state of FE. 2730 * 2731 * NOTE: If FE is set prior to us setting BE we still sync the 2732 * record out, but the flush completion code converts it to 2733 * a delete-on-disk record instead of destroying it. 2734 */ 2735 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2736 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2737 2738 /* 2739 * The backend has already disposed of the record. 2740 */ 2741 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { 2742 error = 0; 2743 goto done; 2744 } 2745 2746 /* 2747 * If the whole inode is being deleted and all on-disk records will 2748 * be deleted very soon, we can't sync any new records to disk 2749 * because they will be deleted in the same transaction they were 2750 * created in (delete_tid == create_tid), which will assert. 2751 * 2752 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2753 * that we currently panic on. 2754 */ 2755 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2756 switch(record->type) { 2757 case HAMMER_MEM_RECORD_DATA: 2758 /* 2759 * We don't have to do anything, if the record was 2760 * committed the space will have been accounted for 2761 * in the blockmap. 2762 */ 2763 /* fall through */ 2764 case HAMMER_MEM_RECORD_GENERAL: 2765 /* 2766 * Set deleted-by-backend flag. Do not set the 2767 * backend committed flag, because we are throwing 2768 * the record away. 2769 */ 2770 record->flags |= HAMMER_RECF_DELETED_BE; 2771 ++record->ip->rec_generation; 2772 error = 0; 2773 goto done; 2774 case HAMMER_MEM_RECORD_ADD: 2775 hpanic("illegal add during inode deletion record %p", 2776 record); 2777 break; /* NOT REACHED */ 2778 case HAMMER_MEM_RECORD_INODE: 2779 hpanic("attempt to sync inode record %p?", record); 2780 break; /* NOT REACHED */ 2781 case HAMMER_MEM_RECORD_DEL: 2782 /* 2783 * Follow through and issue the on-disk deletion 2784 */ 2785 break; 2786 } 2787 } 2788 2789 /* 2790 * If DELETED_FE is set special handling is needed for directory 2791 * entries. Dependant pieces related to the directory entry may 2792 * have already been synced to disk. If this occurs we have to 2793 * sync the directory entry and then change the in-memory record 2794 * from an ADD to a DELETE to cover the fact that it's been 2795 * deleted by the frontend. 2796 * 2797 * A directory delete covering record (MEM_RECORD_DEL) can never 2798 * be deleted by the frontend. 2799 * 2800 * Any other record type (aka DATA) can be deleted by the frontend. 2801 * XXX At the moment the flusher must skip it because there may 2802 * be another data record in the flush group for the same block, 2803 * meaning that some frontend data changes can leak into the backend's 2804 * synchronization point. 2805 */ 2806 if (record->flags & HAMMER_RECF_DELETED_FE) { 2807 if (record->type == HAMMER_MEM_RECORD_ADD) { 2808 /* 2809 * Convert a front-end deleted directory-add to 2810 * a directory-delete entry later. 2811 */ 2812 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2813 } else { 2814 /* 2815 * Dispose of the record (race case). Mark as 2816 * deleted by backend (and not committed). 2817 */ 2818 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2819 record->flags |= HAMMER_RECF_DELETED_BE; 2820 ++record->ip->rec_generation; 2821 error = 0; 2822 goto done; 2823 } 2824 } 2825 2826 /* 2827 * Assign the create_tid for new records. Deletions already 2828 * have the record's entire key properly set up. 2829 */ 2830 if (record->type != HAMMER_MEM_RECORD_DEL) { 2831 record->leaf.base.create_tid = trans->tid; 2832 record->leaf.create_ts = trans->time32; 2833 } 2834 2835 /* 2836 * This actually moves the record to the on-media B-Tree. We 2837 * must also generate REDO_TERM entries in the UNDO/REDO FIFO 2838 * indicating that the related REDO_WRITE(s) have been committed. 2839 * 2840 * During recovery any REDO_TERM's within the nominal recovery span 2841 * are ignored since the related meta-data is being undone, causing 2842 * any matching REDO_WRITEs to execute. The REDO_TERMs outside 2843 * the nominal recovery span will match against REDO_WRITEs and 2844 * prevent them from being executed (because the meta-data has 2845 * already been synchronized). 2846 */ 2847 if (record->flags & HAMMER_RECF_REDO) { 2848 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA); 2849 hammer_generate_redo(trans, record->ip, 2850 record->leaf.base.key - 2851 record->leaf.data_len, 2852 HAMMER_REDO_TERM_WRITE, 2853 NULL, 2854 record->leaf.data_len); 2855 } 2856 2857 for (;;) { 2858 error = hammer_ip_sync_record_cursor(cursor, record); 2859 if (error != EDEADLK) 2860 break; 2861 hammer_done_cursor(cursor); 2862 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2863 record->ip); 2864 if (error) 2865 break; 2866 } 2867 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2868 2869 if (error) 2870 error = -error; 2871 done: 2872 hammer_flush_record_done(record, error); 2873 2874 /* 2875 * Do partial finalization if we have built up too many dirty 2876 * buffers. Otherwise a buffer cache deadlock can occur when 2877 * doing things like creating tens of thousands of tiny files. 2878 * 2879 * We must release our cursor lock to avoid a 3-way deadlock 2880 * due to the exclusive sync lock the finalizer must get. 2881 * 2882 * WARNING: See warnings in hammer_unlock_cursor() function. 2883 */ 2884 if (hammer_flusher_meta_limit(hmp) || 2885 vm_page_count_severe()) { 2886 hammer_unlock_cursor(cursor); 2887 hammer_flusher_finalize(trans, 0); 2888 hammer_lock_cursor(cursor); 2889 } 2890 return(error); 2891 } 2892 2893 /* 2894 * Backend function called by the flusher to sync an inode to media. 2895 */ 2896 int 2897 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2898 { 2899 struct hammer_cursor cursor; 2900 hammer_node_t tmp_node; 2901 hammer_record_t depend; 2902 hammer_record_t next; 2903 int error, tmp_error; 2904 uint64_t nlinks; 2905 2906 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2907 return(0); 2908 2909 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2910 if (error) 2911 goto done; 2912 2913 /* 2914 * Any directory records referencing this inode which are not in 2915 * our current flush group must adjust our nlink count for the 2916 * purposes of synchronizating to disk. 2917 * 2918 * Records which are in our flush group can be unlinked from our 2919 * inode now, potentially allowing the inode to be physically 2920 * deleted. 2921 * 2922 * This cannot block. 2923 */ 2924 nlinks = ip->ino_data.nlinks; 2925 next = TAILQ_FIRST(&ip->target_list); 2926 while ((depend = next) != NULL) { 2927 next = TAILQ_NEXT(depend, target_entry); 2928 if (depend->flush_state == HAMMER_FST_FLUSH && 2929 depend->flush_group == ip->flush_group) { 2930 /* 2931 * If this is an ADD that was deleted by the frontend 2932 * the frontend nlinks count will have already been 2933 * decremented, but the backend is going to sync its 2934 * directory entry and must account for it. The 2935 * record will be converted to a delete-on-disk when 2936 * it gets synced. 2937 * 2938 * If the ADD was not deleted by the frontend we 2939 * can remove the dependancy from our target_list. 2940 */ 2941 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2942 ++nlinks; 2943 } else { 2944 TAILQ_REMOVE(&ip->target_list, depend, 2945 target_entry); 2946 depend->target_ip = NULL; 2947 } 2948 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2949 /* 2950 * Not part of our flush group and not deleted by 2951 * the front-end, adjust the link count synced to 2952 * the media (undo what the frontend did when it 2953 * queued the record). 2954 */ 2955 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2956 switch(depend->type) { 2957 case HAMMER_MEM_RECORD_ADD: 2958 --nlinks; 2959 break; 2960 case HAMMER_MEM_RECORD_DEL: 2961 ++nlinks; 2962 break; 2963 default: 2964 break; 2965 } 2966 } 2967 } 2968 2969 /* 2970 * Set dirty if we had to modify the link count. 2971 */ 2972 if (ip->sync_ino_data.nlinks != nlinks) { 2973 KKASSERT((int64_t)nlinks >= 0); 2974 ip->sync_ino_data.nlinks = nlinks; 2975 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2976 } 2977 2978 /* 2979 * If there is a trunction queued destroy any data past the (aligned) 2980 * truncation point. Userland will have dealt with the buffer 2981 * containing the truncation point for us. 2982 * 2983 * We don't flush pending frontend data buffers until after we've 2984 * dealt with the truncation. 2985 */ 2986 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2987 /* 2988 * Interlock trunc_off. The VOP front-end may continue to 2989 * make adjustments to it while we are blocked. 2990 */ 2991 off_t trunc_off; 2992 off_t aligned_trunc_off; 2993 int blkmask; 2994 2995 trunc_off = ip->sync_trunc_off; 2996 blkmask = hammer_blocksize(trunc_off) - 1; 2997 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2998 2999 /* 3000 * Delete any whole blocks on-media. The front-end has 3001 * already cleaned out any partial block and made it 3002 * pending. The front-end may have updated trunc_off 3003 * while we were blocked so we only use sync_trunc_off. 3004 * 3005 * This operation can blow out the buffer cache, EWOULDBLOCK 3006 * means we were unable to complete the deletion. The 3007 * deletion will update sync_trunc_off in that case. 3008 */ 3009 error = hammer_ip_delete_range(&cursor, ip, 3010 aligned_trunc_off, 3011 0x7FFFFFFFFFFFFFFFLL, 2); 3012 if (error == EWOULDBLOCK) { 3013 ip->flags |= HAMMER_INODE_WOULDBLOCK; 3014 error = 0; 3015 goto defer_buffer_flush; 3016 } 3017 3018 if (error) 3019 goto done; 3020 3021 /* 3022 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO. 3023 * 3024 * XXX we do this even if we did not previously generate 3025 * a REDO_TRUNC record. This operation may enclosed the 3026 * range for multiple prior truncation entries in the REDO 3027 * log. 3028 */ 3029 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR && 3030 (ip->flags & HAMMER_INODE_RDIRTY)) { 3031 hammer_generate_redo(trans, ip, aligned_trunc_off, 3032 HAMMER_REDO_TERM_TRUNC, 3033 NULL, 0); 3034 } 3035 3036 /* 3037 * Clear the truncation flag on the backend after we have 3038 * completed the deletions. Backend data is now good again 3039 * (including new records we are about to sync, below). 3040 * 3041 * Leave sync_trunc_off intact. As we write additional 3042 * records the backend will update sync_trunc_off. This 3043 * tells the backend whether it can skip the overwrite 3044 * test. This should work properly even when the backend 3045 * writes full blocks where the truncation point straddles 3046 * the block because the comparison is against the base 3047 * offset of the record. 3048 */ 3049 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 3050 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 3051 } else { 3052 error = 0; 3053 } 3054 3055 /* 3056 * Now sync related records. These will typically be directory 3057 * entries, records tracking direct-writes, or delete-on-disk records. 3058 */ 3059 if (error == 0) { 3060 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 3061 hammer_sync_record_callback, &cursor); 3062 if (tmp_error < 0) 3063 tmp_error = -error; 3064 if (tmp_error) 3065 error = tmp_error; 3066 } 3067 hammer_cache_node(&ip->cache[1], cursor.node); 3068 3069 /* 3070 * Re-seek for inode update, assuming our cache hasn't been ripped 3071 * out from under us. 3072 */ 3073 if (error == 0) { 3074 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error); 3075 if (tmp_node) { 3076 hammer_cursor_downgrade(&cursor); 3077 hammer_lock_sh(&tmp_node->lock); 3078 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 3079 hammer_cursor_seek(&cursor, tmp_node, 0); 3080 hammer_unlock(&tmp_node->lock); 3081 hammer_rel_node(tmp_node); 3082 } 3083 error = 0; 3084 } 3085 3086 /* 3087 * If we are deleting the inode the frontend had better not have 3088 * any active references on elements making up the inode. 3089 * 3090 * The call to hammer_ip_delete_clean() cleans up auxillary records 3091 * but not DB or DATA records. Those must have already been deleted 3092 * by the normal truncation mechanic. 3093 */ 3094 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 3095 RB_EMPTY(&ip->rec_tree) && 3096 (ip->sync_flags & HAMMER_INODE_DELETING) && 3097 (ip->flags & HAMMER_INODE_DELETED) == 0) { 3098 int count1 = 0; 3099 3100 error = hammer_ip_delete_clean(&cursor, ip, &count1); 3101 if (error == 0) { 3102 ip->flags |= HAMMER_INODE_DELETED; 3103 ip->sync_flags &= ~HAMMER_INODE_DELETING; 3104 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 3105 KKASSERT(RB_EMPTY(&ip->rec_tree)); 3106 3107 /* 3108 * Set delete_tid in both the frontend and backend 3109 * copy of the inode record. The DELETED flag handles 3110 * this, do not set DDIRTY. 3111 */ 3112 ip->ino_leaf.base.delete_tid = trans->tid; 3113 ip->sync_ino_leaf.base.delete_tid = trans->tid; 3114 ip->ino_leaf.delete_ts = trans->time32; 3115 ip->sync_ino_leaf.delete_ts = trans->time32; 3116 3117 3118 /* 3119 * Adjust the inode count in the volume header 3120 */ 3121 hammer_sync_lock_sh(trans); 3122 if (ip->flags & HAMMER_INODE_ONDISK) { 3123 hammer_modify_volume_field(trans, 3124 trans->rootvol, 3125 vol0_stat_inodes); 3126 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 3127 hammer_modify_volume_done(trans->rootvol); 3128 } 3129 hammer_sync_unlock(trans); 3130 } 3131 } 3132 3133 if (error) 3134 goto done; 3135 ip->sync_flags &= ~HAMMER_INODE_BUFS; 3136 3137 defer_buffer_flush: 3138 /* 3139 * Now update the inode's on-disk inode-data and/or on-disk record. 3140 * DELETED and ONDISK are managed only in ip->flags. 3141 * 3142 * In the case of a defered buffer flush we still update the on-disk 3143 * inode to satisfy visibility requirements if there happen to be 3144 * directory dependancies. 3145 */ 3146 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 3147 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 3148 /* 3149 * If deleted and on-disk, don't set any additional flags. 3150 * the delete flag takes care of things. 3151 * 3152 * Clear flags which may have been set by the frontend. 3153 */ 3154 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 3155 HAMMER_INODE_SDIRTY | 3156 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 3157 HAMMER_INODE_DELETING); 3158 break; 3159 case HAMMER_INODE_DELETED: 3160 /* 3161 * Take care of the case where a deleted inode was never 3162 * flushed to the disk in the first place. 3163 * 3164 * Clear flags which may have been set by the frontend. 3165 */ 3166 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 3167 HAMMER_INODE_SDIRTY | 3168 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 3169 HAMMER_INODE_DELETING); 3170 while (RB_ROOT(&ip->rec_tree)) { 3171 hammer_record_t record = RB_ROOT(&ip->rec_tree); 3172 hammer_ref(&record->lock); 3173 KKASSERT(hammer_oneref(&record->lock)); 3174 record->flags |= HAMMER_RECF_DELETED_BE; 3175 ++record->ip->rec_generation; 3176 hammer_rel_mem_record(record); 3177 } 3178 break; 3179 case HAMMER_INODE_ONDISK: 3180 /* 3181 * If already on-disk, do not set any additional flags. 3182 */ 3183 break; 3184 default: 3185 /* 3186 * If not on-disk and not deleted, set DDIRTY to force 3187 * an initial record to be written. 3188 * 3189 * Also set the create_tid in both the frontend and backend 3190 * copy of the inode record. 3191 */ 3192 ip->ino_leaf.base.create_tid = trans->tid; 3193 ip->ino_leaf.create_ts = trans->time32; 3194 ip->sync_ino_leaf.base.create_tid = trans->tid; 3195 ip->sync_ino_leaf.create_ts = trans->time32; 3196 ip->sync_flags |= HAMMER_INODE_DDIRTY; 3197 break; 3198 } 3199 3200 /* 3201 * If DDIRTY or SDIRTY is set, write out a new record. 3202 * If the inode is already on-disk the old record is marked as 3203 * deleted. 3204 * 3205 * If DELETED is set hammer_update_inode() will delete the existing 3206 * record without writing out a new one. 3207 */ 3208 if (ip->flags & HAMMER_INODE_DELETED) { 3209 error = hammer_update_inode(&cursor, ip); 3210 } else 3211 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) && 3212 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 3213 error = hammer_update_itimes(&cursor, ip); 3214 } else 3215 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY | 3216 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 3217 error = hammer_update_inode(&cursor, ip); 3218 } 3219 done: 3220 if (ip->flags & HAMMER_INODE_MODMASK) 3221 hammer_inode_dirty(ip); 3222 if (error) { 3223 hammer_critical_error(ip->hmp, ip, error, 3224 "while syncing inode"); 3225 } 3226 hammer_done_cursor(&cursor); 3227 return(error); 3228 } 3229 3230 /* 3231 * This routine is called when the OS is no longer actively referencing 3232 * the inode (but might still be keeping it cached), or when releasing 3233 * the last reference to an inode. 3234 * 3235 * At this point if the inode's nlinks count is zero we want to destroy 3236 * it, which may mean destroying it on-media too. 3237 */ 3238 void 3239 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 3240 { 3241 struct vnode *vp; 3242 3243 /* 3244 * Set the DELETING flag when the link count drops to 0 and the 3245 * OS no longer has any opens on the inode. 3246 * 3247 * The backend will clear DELETING (a mod flag) and set DELETED 3248 * (a state flag) when it is actually able to perform the 3249 * operation. 3250 * 3251 * Don't reflag the deletion if the flusher is currently syncing 3252 * one that was already flagged. A previously set DELETING flag 3253 * may bounce around flags and sync_flags until the operation is 3254 * completely done. 3255 * 3256 * Do not attempt to modify a snapshot inode (one set to read-only). 3257 */ 3258 if (ip->ino_data.nlinks == 0 && 3259 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_RO|HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 3260 ip->flags |= HAMMER_INODE_DELETING; 3261 ip->flags |= HAMMER_INODE_TRUNCATED; 3262 ip->trunc_off = 0; 3263 vp = NULL; 3264 if (getvp) { 3265 if (hammer_get_vnode(ip, &vp) != 0) 3266 return; 3267 } 3268 3269 /* 3270 * Final cleanup 3271 */ 3272 if (ip->vp) 3273 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0, 0); 3274 if (ip->flags & HAMMER_INODE_MODMASK) 3275 hammer_inode_dirty(ip); 3276 if (getvp) 3277 vput(vp); 3278 } 3279 } 3280 3281 /* 3282 * After potentially resolving a dependancy the inode is tested 3283 * to determine whether it needs to be reflushed. 3284 */ 3285 void 3286 hammer_test_inode(hammer_inode_t ip) 3287 { 3288 if (ip->flags & HAMMER_INODE_REFLUSH) { 3289 ip->flags &= ~HAMMER_INODE_REFLUSH; 3290 hammer_ref(&ip->lock); 3291 if (ip->flags & HAMMER_INODE_RESIGNAL) { 3292 ip->flags &= ~HAMMER_INODE_RESIGNAL; 3293 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 3294 } else { 3295 hammer_flush_inode(ip, 0); 3296 } 3297 hammer_rel_inode(ip, 0); 3298 } 3299 } 3300 3301 /* 3302 * Clear the RECLAIM flag on an inode. This occurs when the inode is 3303 * reassociated with a vp or just before it gets freed. 3304 * 3305 * Pipeline wakeups to threads blocked due to an excessive number of 3306 * detached inodes. This typically occurs when atime updates accumulate 3307 * while scanning a directory tree. 3308 */ 3309 static void 3310 hammer_inode_wakereclaims(hammer_inode_t ip) 3311 { 3312 struct hammer_reclaim *reclaim; 3313 hammer_mount_t hmp = ip->hmp; 3314 3315 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 3316 return; 3317 3318 --hammer_count_reclaims; 3319 --hmp->count_reclaims; 3320 ip->flags &= ~HAMMER_INODE_RECLAIM; 3321 3322 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) { 3323 KKASSERT(reclaim->count > 0); 3324 if (--reclaim->count == 0) { 3325 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 3326 wakeup(reclaim); 3327 } 3328 } 3329 } 3330 3331 /* 3332 * Setup our reclaim pipeline. We only let so many detached (and dirty) 3333 * inodes build up before we start blocking. This routine is called 3334 * if a new inode is created or an inode is loaded from media. 3335 * 3336 * When we block we don't care *which* inode has finished reclaiming, 3337 * as long as one does. 3338 * 3339 * The reclaim pipeline is primarily governed by the auto-flush which is 3340 * 1/4 hammer_limit_reclaims. We don't want to block if the count is 3341 * less than 1/2 hammer_limit_reclaims. From 1/2 to full count is 3342 * dynamically governed. 3343 */ 3344 void 3345 hammer_inode_waitreclaims(hammer_transaction_t trans) 3346 { 3347 hammer_mount_t hmp = trans->hmp; 3348 struct hammer_reclaim reclaim; 3349 int lower_limit; 3350 3351 /* 3352 * Track inode load, delay if the number of reclaiming inodes is 3353 * between 2/4 and 4/4 hammer_limit_reclaims, depending. 3354 */ 3355 if (curthread->td_proc) { 3356 struct hammer_inostats *stats; 3357 3358 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid); 3359 ++stats->count; 3360 3361 if (stats->count > hammer_limit_reclaims / 2) 3362 stats->count = hammer_limit_reclaims / 2; 3363 lower_limit = hammer_limit_reclaims - stats->count; 3364 if (hammer_debug_general & 0x10000) { 3365 hdkprintf("pid %5d limit %d\n", 3366 (int)curthread->td_proc->p_pid, lower_limit); 3367 } 3368 } else { 3369 lower_limit = hammer_limit_reclaims * 3 / 4; 3370 } 3371 if (hmp->count_reclaims >= lower_limit) { 3372 reclaim.count = 1; 3373 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry); 3374 tsleep(&reclaim, 0, "hmrrcm", hz); 3375 if (reclaim.count > 0) 3376 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 3377 } 3378 } 3379 3380 /* 3381 * Keep track of reclaim statistics on a per-pid basis using a loose 3382 * 4-way set associative hash table. Collisions inherit the count of 3383 * the previous entry. 3384 * 3385 * NOTE: We want to be careful here to limit the chain size. If the chain 3386 * size is too large a pid will spread its stats out over too many 3387 * entries under certain types of heavy filesystem activity and 3388 * wind up not delaying long enough. 3389 */ 3390 static 3391 struct hammer_inostats * 3392 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid) 3393 { 3394 struct hammer_inostats *stats; 3395 int delta; 3396 int chain; 3397 static volatile int iterator; /* we don't care about MP races */ 3398 3399 /* 3400 * Chain up to 4 times to find our entry. 3401 */ 3402 for (chain = 0; chain < 4; ++chain) { 3403 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK]; 3404 if (stats->pid == pid) 3405 break; 3406 } 3407 3408 /* 3409 * Replace one of the four chaining entries with our new entry. 3410 */ 3411 if (chain == 4) { 3412 stats = &hmp->inostats[(pid + (iterator++ & 3)) & 3413 HAMMER_INOSTATS_HMASK]; 3414 stats->pid = pid; 3415 } 3416 3417 /* 3418 * Decay the entry 3419 */ 3420 if (stats->count && stats->ltick != ticks) { 3421 delta = ticks - stats->ltick; 3422 stats->ltick = ticks; 3423 if (delta <= 0 || delta > hz * 60) 3424 stats->count = 0; 3425 else 3426 stats->count = stats->count * hz / (hz + delta); 3427 } 3428 if (hammer_debug_general & 0x10000) 3429 hdkprintf("pid %5d stats %d\n", (int)pid, stats->count); 3430 return (stats); 3431 } 3432 3433 #if 0 3434 3435 /* 3436 * XXX not used, doesn't work very well due to the large batching nature 3437 * of flushes. 3438 * 3439 * A larger then normal backlog of inodes is sitting in the flusher, 3440 * enforce a general slowdown to let it catch up. This routine is only 3441 * called on completion of a non-flusher-related transaction which 3442 * performed B-Tree node I/O. 3443 * 3444 * It is possible for the flusher to stall in a continuous load. 3445 * blogbench -i1000 -o seems to do a good job generating this sort of load. 3446 * If the flusher is unable to catch up the inode count can bloat until 3447 * we run out of kvm. 3448 * 3449 * This is a bit of a hack. 3450 */ 3451 void 3452 hammer_inode_waithard(hammer_mount_t hmp) 3453 { 3454 /* 3455 * Hysteresis. 3456 */ 3457 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) { 3458 if (hmp->count_reclaims < hammer_limit_reclaims / 2 && 3459 hmp->count_iqueued < hmp->count_inodes / 20) { 3460 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY; 3461 return; 3462 } 3463 } else { 3464 if (hmp->count_reclaims < hammer_limit_reclaims || 3465 hmp->count_iqueued < hmp->count_inodes / 10) { 3466 return; 3467 } 3468 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY; 3469 } 3470 3471 /* 3472 * Block for one flush cycle. 3473 */ 3474 hammer_flusher_wait_next(hmp); 3475 } 3476 3477 #endif 3478