1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.114 2008/09/24 00:53:51 dillon Exp $ 35 */ 36 37 #include "hammer.h" 38 #include <vm/vm_extern.h> 39 40 static int hammer_unload_inode(struct hammer_inode *ip); 41 static void hammer_free_inode(hammer_inode_t ip); 42 static void hammer_flush_inode_core(hammer_inode_t ip, 43 hammer_flush_group_t flg, int flags); 44 static int hammer_setup_child_callback(hammer_record_t rec, void *data); 45 #if 0 46 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data); 47 #endif 48 static int hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 49 hammer_flush_group_t flg); 50 static int hammer_setup_parent_inodes_helper(hammer_record_t record, 51 int depth, hammer_flush_group_t flg); 52 static void hammer_inode_wakereclaims(hammer_inode_t ip); 53 static struct hammer_inostats *hammer_inode_inostats(hammer_mount_t hmp, 54 pid_t pid); 55 56 #ifdef DEBUG_TRUNCATE 57 extern struct hammer_inode *HammerTruncIp; 58 #endif 59 60 /* 61 * RB-Tree support for inode structures 62 */ 63 int 64 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2) 65 { 66 if (ip1->obj_localization < ip2->obj_localization) 67 return(-1); 68 if (ip1->obj_localization > ip2->obj_localization) 69 return(1); 70 if (ip1->obj_id < ip2->obj_id) 71 return(-1); 72 if (ip1->obj_id > ip2->obj_id) 73 return(1); 74 if (ip1->obj_asof < ip2->obj_asof) 75 return(-1); 76 if (ip1->obj_asof > ip2->obj_asof) 77 return(1); 78 return(0); 79 } 80 81 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 u_int32_t localization = *(u_int32_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, u_int32_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); 180 181 /* 182 * Degenerate case 183 */ 184 if (ip == NULL) { 185 vrecycle(ap->a_vp); 186 return(0); 187 } 188 189 /* 190 * If the inode no longer has visibility in the filesystem try to 191 * recycle it immediately, even if the inode is dirty. Recycling 192 * it quickly allows the system to reclaim buffer cache and VM 193 * resources which can matter a lot in a heavily loaded system. 194 * 195 * This can deadlock in vfsync() if we aren't careful. 196 * 197 * Do not queue the inode to the flusher if we still have visibility, 198 * otherwise namespace calls such as chmod will unnecessarily generate 199 * multiple inode updates. 200 */ 201 if (ip->ino_data.nlinks == 0) { 202 get_mplock(); 203 hammer_inode_unloadable_check(ip, 0); 204 if (ip->flags & HAMMER_INODE_MODMASK) 205 hammer_flush_inode(ip, 0); 206 vrecycle(ap->a_vp); 207 rel_mplock(); 208 } 209 return(0); 210 } 211 212 /* 213 * Release the vnode association. This is typically (but not always) 214 * the last reference on the inode. 215 * 216 * Once the association is lost we are on our own with regards to 217 * flushing the inode. 218 * 219 * We must interlock ip->vp so hammer_get_vnode() can avoid races. 220 */ 221 int 222 hammer_vop_reclaim(struct vop_reclaim_args *ap) 223 { 224 struct hammer_inode *ip; 225 hammer_mount_t hmp; 226 struct vnode *vp; 227 228 vp = ap->a_vp; 229 230 if ((ip = vp->v_data) != NULL) { 231 hmp = ip->hmp; 232 hammer_lock_ex(&ip->lock); 233 vp->v_data = NULL; 234 ip->vp = NULL; 235 236 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { 237 ++hammer_count_reclaiming; 238 ++hmp->inode_reclaims; 239 ip->flags |= HAMMER_INODE_RECLAIM; 240 } 241 hammer_unlock(&ip->lock); 242 hammer_rel_inode(ip, 1); 243 } 244 return(0); 245 } 246 247 /* 248 * Return a locked vnode for the specified inode. The inode must be 249 * referenced but NOT LOCKED on entry and will remain referenced on 250 * return. 251 * 252 * Called from the frontend. 253 */ 254 int 255 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) 256 { 257 hammer_mount_t hmp; 258 struct vnode *vp; 259 int error = 0; 260 u_int8_t obj_type; 261 262 hmp = ip->hmp; 263 264 for (;;) { 265 if ((vp = ip->vp) == NULL) { 266 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); 267 if (error) 268 break; 269 hammer_lock_ex(&ip->lock); 270 if (ip->vp != NULL) { 271 hammer_unlock(&ip->lock); 272 vp = *vpp; 273 vp->v_type = VBAD; 274 vx_put(vp); 275 continue; 276 } 277 hammer_ref(&ip->lock); 278 vp = *vpp; 279 ip->vp = vp; 280 281 obj_type = ip->ino_data.obj_type; 282 vp->v_type = hammer_get_vnode_type(obj_type); 283 284 hammer_inode_wakereclaims(ip); 285 286 switch(ip->ino_data.obj_type) { 287 case HAMMER_OBJTYPE_CDEV: 288 case HAMMER_OBJTYPE_BDEV: 289 vp->v_ops = &hmp->mp->mnt_vn_spec_ops; 290 addaliasu(vp, ip->ino_data.rmajor, 291 ip->ino_data.rminor); 292 break; 293 case HAMMER_OBJTYPE_FIFO: 294 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops; 295 break; 296 case HAMMER_OBJTYPE_REGFILE: 297 break; 298 default: 299 break; 300 } 301 302 /* 303 * Only mark as the root vnode if the ip is not 304 * historical, otherwise the VFS cache will get 305 * confused. The other half of the special handling 306 * is in hammer_vop_nlookupdotdot(). 307 * 308 * Pseudo-filesystem roots can be accessed via 309 * non-root filesystem paths and setting VROOT may 310 * confuse the namecache. Set VPFSROOT instead. 311 */ 312 if (ip->obj_id == HAMMER_OBJID_ROOT && 313 ip->obj_asof == hmp->asof) { 314 if (ip->obj_localization == 0) 315 vsetflags(vp, VROOT); 316 else 317 vsetflags(vp, VPFSROOT); 318 } 319 320 vp->v_data = (void *)ip; 321 /* vnode locked by getnewvnode() */ 322 /* make related vnode dirty if inode dirty? */ 323 hammer_unlock(&ip->lock); 324 if (vp->v_type == VREG) { 325 vinitvmio(vp, ip->ino_data.size, 326 hammer_blocksize(ip->ino_data.size), 327 hammer_blockoff(ip->ino_data.size)); 328 } 329 break; 330 } 331 332 /* 333 * Interlock vnode clearing. This does not prevent the 334 * vnode from going into a reclaimed state but it does 335 * prevent it from being destroyed or reused so the vget() 336 * will properly fail. 337 */ 338 hammer_lock_ex(&ip->lock); 339 if ((vp = ip->vp) == NULL) { 340 hammer_unlock(&ip->lock); 341 continue; 342 } 343 vhold_interlocked(vp); 344 hammer_unlock(&ip->lock); 345 346 /* 347 * loop if the vget fails (aka races), or if the vp 348 * no longer matches ip->vp. 349 */ 350 if (vget(vp, LK_EXCLUSIVE) == 0) { 351 if (vp == ip->vp) { 352 vdrop(vp); 353 break; 354 } 355 vput(vp); 356 } 357 vdrop(vp); 358 } 359 *vpp = vp; 360 return(error); 361 } 362 363 /* 364 * Locate all copies of the inode for obj_id compatible with the specified 365 * asof, reference, and issue the related call-back. This routine is used 366 * for direct-io invalidation and does not create any new inodes. 367 */ 368 void 369 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo, 370 int (*callback)(hammer_inode_t ip, void *data), 371 void *data) 372 { 373 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root, 374 hammer_inode_info_cmp_all_history, 375 callback, iinfo); 376 } 377 378 /* 379 * Acquire a HAMMER inode. The returned inode is not locked. These functions 380 * do not attach or detach the related vnode (use hammer_get_vnode() for 381 * that). 382 * 383 * The flags argument is only applied for newly created inodes, and only 384 * certain flags are inherited. 385 * 386 * Called from the frontend. 387 */ 388 struct hammer_inode * 389 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, 390 int64_t obj_id, hammer_tid_t asof, u_int32_t localization, 391 int flags, int *errorp) 392 { 393 hammer_mount_t hmp = trans->hmp; 394 struct hammer_node_cache *cachep; 395 struct hammer_inode_info iinfo; 396 struct hammer_cursor cursor; 397 struct hammer_inode *ip; 398 399 400 /* 401 * Determine if we already have an inode cached. If we do then 402 * we are golden. 403 * 404 * If we find an inode with no vnode we have to mark the 405 * transaction such that hammer_inode_waitreclaims() is 406 * called later on to avoid building up an infinite number 407 * of inodes. Otherwise we can continue to * add new inodes 408 * faster then they can be disposed of, even with the tsleep 409 * delay. 410 * 411 * If we find a dummy inode we return a failure so dounlink 412 * (which does another lookup) doesn't try to mess with the 413 * link count. hammer_vop_nresolve() uses hammer_get_dummy_inode() 414 * to ref dummy inodes. 415 */ 416 iinfo.obj_id = obj_id; 417 iinfo.obj_asof = asof; 418 iinfo.obj_localization = localization; 419 loop: 420 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 421 if (ip) { 422 if (ip->flags & HAMMER_INODE_DUMMY) { 423 *errorp = ENOENT; 424 return(NULL); 425 } 426 hammer_ref(&ip->lock); 427 *errorp = 0; 428 return(ip); 429 } 430 431 /* 432 * Allocate a new inode structure and deal with races later. 433 */ 434 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 435 ++hammer_count_inodes; 436 ++hmp->count_inodes; 437 ip->obj_id = obj_id; 438 ip->obj_asof = iinfo.obj_asof; 439 ip->obj_localization = localization; 440 ip->hmp = hmp; 441 ip->flags = flags & HAMMER_INODE_RO; 442 ip->cache[0].ip = ip; 443 ip->cache[1].ip = ip; 444 ip->cache[2].ip = ip; 445 ip->cache[3].ip = ip; 446 if (hmp->ronly) 447 ip->flags |= HAMMER_INODE_RO; 448 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 449 0x7FFFFFFFFFFFFFFFLL; 450 RB_INIT(&ip->rec_tree); 451 TAILQ_INIT(&ip->target_list); 452 hammer_ref(&ip->lock); 453 454 /* 455 * Locate the on-disk inode. If this is a PFS root we always 456 * access the current version of the root inode and (if it is not 457 * a master) always access information under it with a snapshot 458 * TID. 459 * 460 * We cache recent inode lookups in this directory in dip->cache[2]. 461 * If we can't find it we assume the inode we are looking for is 462 * close to the directory inode. 463 */ 464 retry: 465 cachep = NULL; 466 if (dip) { 467 if (dip->cache[2].node) 468 cachep = &dip->cache[2]; 469 else 470 cachep = &dip->cache[0]; 471 } 472 hammer_init_cursor(trans, &cursor, cachep, NULL); 473 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE; 474 cursor.key_beg.obj_id = ip->obj_id; 475 cursor.key_beg.key = 0; 476 cursor.key_beg.create_tid = 0; 477 cursor.key_beg.delete_tid = 0; 478 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 479 cursor.key_beg.obj_type = 0; 480 481 cursor.asof = iinfo.obj_asof; 482 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 483 HAMMER_CURSOR_ASOF; 484 485 *errorp = hammer_btree_lookup(&cursor); 486 if (*errorp == EDEADLK) { 487 hammer_done_cursor(&cursor); 488 goto retry; 489 } 490 491 /* 492 * On success the B-Tree lookup will hold the appropriate 493 * buffer cache buffers and provide a pointer to the requested 494 * information. Copy the information to the in-memory inode 495 * and cache the B-Tree node to improve future operations. 496 */ 497 if (*errorp == 0) { 498 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 499 ip->ino_data = cursor.data->inode; 500 501 /* 502 * cache[0] tries to cache the location of the object inode. 503 * The assumption is that it is near the directory inode. 504 * 505 * cache[1] tries to cache the location of the object data. 506 * We might have something in the governing directory from 507 * scan optimizations (see the strategy code in 508 * hammer_vnops.c). 509 * 510 * We update dip->cache[2], if possible, with the location 511 * of the object inode for future directory shortcuts. 512 */ 513 hammer_cache_node(&ip->cache[0], cursor.node); 514 if (dip) { 515 if (dip->cache[3].node) { 516 hammer_cache_node(&ip->cache[1], 517 dip->cache[3].node); 518 } 519 hammer_cache_node(&dip->cache[2], cursor.node); 520 } 521 522 /* 523 * The file should not contain any data past the file size 524 * stored in the inode. Setting save_trunc_off to the 525 * file size instead of max reduces B-Tree lookup overheads 526 * on append by allowing the flusher to avoid checking for 527 * record overwrites. 528 */ 529 ip->save_trunc_off = ip->ino_data.size; 530 531 /* 532 * Locate and assign the pseudofs management structure to 533 * the inode. 534 */ 535 if (dip && dip->obj_localization == ip->obj_localization) { 536 ip->pfsm = dip->pfsm; 537 hammer_ref(&ip->pfsm->lock); 538 } else { 539 ip->pfsm = hammer_load_pseudofs(trans, 540 ip->obj_localization, 541 errorp); 542 *errorp = 0; /* ignore ENOENT */ 543 } 544 } 545 546 /* 547 * The inode is placed on the red-black tree and will be synced to 548 * the media when flushed or by the filesystem sync. If this races 549 * another instantiation/lookup the insertion will fail. 550 */ 551 if (*errorp == 0) { 552 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 553 hammer_free_inode(ip); 554 hammer_done_cursor(&cursor); 555 goto loop; 556 } 557 ip->flags |= HAMMER_INODE_ONDISK; 558 } else { 559 if (ip->flags & HAMMER_INODE_RSV_INODES) { 560 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 561 --hmp->rsv_inodes; 562 } 563 564 hammer_free_inode(ip); 565 ip = NULL; 566 } 567 hammer_done_cursor(&cursor); 568 569 /* 570 * NEWINODE is only set if the inode becomes dirty later, 571 * setting it here just leads to unnecessary stalls. 572 * 573 * trans->flags |= HAMMER_TRANSF_NEWINODE; 574 */ 575 return (ip); 576 } 577 578 /* 579 * Get a dummy inode to placemark a broken directory entry. 580 */ 581 struct hammer_inode * 582 hammer_get_dummy_inode(hammer_transaction_t trans, hammer_inode_t dip, 583 int64_t obj_id, hammer_tid_t asof, u_int32_t localization, 584 int flags, int *errorp) 585 { 586 hammer_mount_t hmp = trans->hmp; 587 struct hammer_inode_info iinfo; 588 struct hammer_inode *ip; 589 590 /* 591 * Determine if we already have an inode cached. If we do then 592 * we are golden. 593 * 594 * If we find an inode with no vnode we have to mark the 595 * transaction such that hammer_inode_waitreclaims() is 596 * called later on to avoid building up an infinite number 597 * of inodes. Otherwise we can continue to * add new inodes 598 * faster then they can be disposed of, even with the tsleep 599 * delay. 600 * 601 * If we find a non-fake inode we return an error. Only fake 602 * inodes can be returned by this routine. 603 */ 604 iinfo.obj_id = obj_id; 605 iinfo.obj_asof = asof; 606 iinfo.obj_localization = localization; 607 loop: 608 *errorp = 0; 609 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 610 if (ip) { 611 if ((ip->flags & HAMMER_INODE_DUMMY) == 0) { 612 *errorp = ENOENT; 613 return(NULL); 614 } 615 hammer_ref(&ip->lock); 616 return(ip); 617 } 618 619 /* 620 * Allocate a new inode structure and deal with races later. 621 */ 622 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 623 ++hammer_count_inodes; 624 ++hmp->count_inodes; 625 ip->obj_id = obj_id; 626 ip->obj_asof = iinfo.obj_asof; 627 ip->obj_localization = localization; 628 ip->hmp = hmp; 629 ip->flags = flags | HAMMER_INODE_RO | HAMMER_INODE_DUMMY; 630 ip->cache[0].ip = ip; 631 ip->cache[1].ip = ip; 632 ip->cache[2].ip = ip; 633 ip->cache[3].ip = ip; 634 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 635 0x7FFFFFFFFFFFFFFFLL; 636 RB_INIT(&ip->rec_tree); 637 TAILQ_INIT(&ip->target_list); 638 hammer_ref(&ip->lock); 639 640 /* 641 * Populate the dummy inode. Leave everything zero'd out. 642 * 643 * (ip->ino_leaf and ip->ino_data) 644 * 645 * Make the dummy inode a FIFO object which most copy programs 646 * will properly ignore. 647 */ 648 ip->save_trunc_off = ip->ino_data.size; 649 ip->ino_data.obj_type = HAMMER_OBJTYPE_FIFO; 650 651 /* 652 * Locate and assign the pseudofs management structure to 653 * the inode. 654 */ 655 if (dip && dip->obj_localization == ip->obj_localization) { 656 ip->pfsm = dip->pfsm; 657 hammer_ref(&ip->pfsm->lock); 658 } else { 659 ip->pfsm = hammer_load_pseudofs(trans, ip->obj_localization, 660 errorp); 661 *errorp = 0; /* ignore ENOENT */ 662 } 663 664 /* 665 * The inode is placed on the red-black tree and will be synced to 666 * the media when flushed or by the filesystem sync. If this races 667 * another instantiation/lookup the insertion will fail. 668 * 669 * NOTE: Do not set HAMMER_INODE_ONDISK. The inode is a fake. 670 */ 671 if (*errorp == 0) { 672 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 673 hammer_free_inode(ip); 674 goto loop; 675 } 676 } else { 677 if (ip->flags & HAMMER_INODE_RSV_INODES) { 678 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 679 --hmp->rsv_inodes; 680 } 681 hammer_free_inode(ip); 682 ip = NULL; 683 } 684 trans->flags |= HAMMER_TRANSF_NEWINODE; 685 return (ip); 686 } 687 688 /* 689 * Return a referenced inode only if it is in our inode cache. 690 * 691 * Dummy inodes do not count. 692 */ 693 struct hammer_inode * 694 hammer_find_inode(hammer_transaction_t trans, int64_t obj_id, 695 hammer_tid_t asof, u_int32_t localization) 696 { 697 hammer_mount_t hmp = trans->hmp; 698 struct hammer_inode_info iinfo; 699 struct hammer_inode *ip; 700 701 iinfo.obj_id = obj_id; 702 iinfo.obj_asof = asof; 703 iinfo.obj_localization = localization; 704 705 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 706 if (ip) { 707 if (ip->flags & HAMMER_INODE_DUMMY) 708 ip = NULL; 709 else 710 hammer_ref(&ip->lock); 711 } 712 return(ip); 713 } 714 715 /* 716 * Create a new filesystem object, returning the inode in *ipp. The 717 * returned inode will be referenced. The inode is created in-memory. 718 * 719 * If pfsm is non-NULL the caller wishes to create the root inode for 720 * a master PFS. 721 */ 722 int 723 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 724 struct ucred *cred, 725 hammer_inode_t dip, const char *name, int namelen, 726 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 727 { 728 hammer_mount_t hmp; 729 hammer_inode_t ip; 730 uid_t xuid; 731 int error; 732 int64_t namekey; 733 u_int32_t dummy; 734 735 hmp = trans->hmp; 736 737 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 738 ++hammer_count_inodes; 739 ++hmp->count_inodes; 740 trans->flags |= HAMMER_TRANSF_NEWINODE; 741 742 if (pfsm) { 743 KKASSERT(pfsm->localization != 0); 744 ip->obj_id = HAMMER_OBJID_ROOT; 745 ip->obj_localization = pfsm->localization; 746 } else { 747 KKASSERT(dip != NULL); 748 namekey = hammer_directory_namekey(dip, name, namelen, &dummy); 749 ip->obj_id = hammer_alloc_objid(hmp, dip, namekey); 750 ip->obj_localization = dip->obj_localization; 751 } 752 753 KKASSERT(ip->obj_id != 0); 754 ip->obj_asof = hmp->asof; 755 ip->hmp = hmp; 756 ip->flush_state = HAMMER_FST_IDLE; 757 ip->flags = HAMMER_INODE_DDIRTY | 758 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 759 ip->cache[0].ip = ip; 760 ip->cache[1].ip = ip; 761 ip->cache[2].ip = ip; 762 ip->cache[3].ip = ip; 763 764 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 765 /* ip->save_trunc_off = 0; (already zero) */ 766 RB_INIT(&ip->rec_tree); 767 TAILQ_INIT(&ip->target_list); 768 769 ip->ino_data.atime = trans->time; 770 ip->ino_data.mtime = trans->time; 771 ip->ino_data.size = 0; 772 ip->ino_data.nlinks = 0; 773 774 /* 775 * A nohistory designator on the parent directory is inherited by 776 * the child. We will do this even for pseudo-fs creation... the 777 * sysad can turn it off. 778 */ 779 if (dip) { 780 ip->ino_data.uflags = dip->ino_data.uflags & 781 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 782 } 783 784 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 785 ip->ino_leaf.base.localization = ip->obj_localization + 786 HAMMER_LOCALIZE_INODE; 787 ip->ino_leaf.base.obj_id = ip->obj_id; 788 ip->ino_leaf.base.key = 0; 789 ip->ino_leaf.base.create_tid = 0; 790 ip->ino_leaf.base.delete_tid = 0; 791 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 792 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 793 794 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 795 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 796 ip->ino_data.mode = vap->va_mode; 797 ip->ino_data.ctime = trans->time; 798 799 /* 800 * If we are running version 2 or greater directory entries are 801 * inode-localized instead of data-localized. 802 */ 803 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 804 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 805 ip->ino_data.cap_flags |= 806 HAMMER_INODE_CAP_DIR_LOCAL_INO; 807 } 808 } 809 810 /* 811 * Setup the ".." pointer. This only needs to be done for directories 812 * but we do it for all objects as a recovery aid. 813 */ 814 if (dip) 815 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 816 #if 0 817 /* 818 * The parent_obj_localization field only applies to pseudo-fs roots. 819 * XXX this is no longer applicable, PFSs are no longer directly 820 * tied into the parent's directory structure. 821 */ 822 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY && 823 ip->obj_id == HAMMER_OBJID_ROOT) { 824 ip->ino_data.ext.obj.parent_obj_localization = 825 dip->obj_localization; 826 } 827 #endif 828 829 switch(ip->ino_leaf.base.obj_type) { 830 case HAMMER_OBJTYPE_CDEV: 831 case HAMMER_OBJTYPE_BDEV: 832 ip->ino_data.rmajor = vap->va_rmajor; 833 ip->ino_data.rminor = vap->va_rminor; 834 break; 835 default: 836 break; 837 } 838 839 /* 840 * Calculate default uid/gid and overwrite with information from 841 * the vap. 842 */ 843 if (dip) { 844 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 845 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 846 xuid, cred, &vap->va_mode); 847 } else { 848 xuid = 0; 849 } 850 ip->ino_data.mode = vap->va_mode; 851 852 if (vap->va_vaflags & VA_UID_UUID_VALID) 853 ip->ino_data.uid = vap->va_uid_uuid; 854 else if (vap->va_uid != (uid_t)VNOVAL) 855 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 856 else 857 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 858 859 if (vap->va_vaflags & VA_GID_UUID_VALID) 860 ip->ino_data.gid = vap->va_gid_uuid; 861 else if (vap->va_gid != (gid_t)VNOVAL) 862 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 863 else if (dip) 864 ip->ino_data.gid = dip->ino_data.gid; 865 866 hammer_ref(&ip->lock); 867 868 if (pfsm) { 869 ip->pfsm = pfsm; 870 hammer_ref(&pfsm->lock); 871 error = 0; 872 } else if (dip->obj_localization == ip->obj_localization) { 873 ip->pfsm = dip->pfsm; 874 hammer_ref(&ip->pfsm->lock); 875 error = 0; 876 } else { 877 ip->pfsm = hammer_load_pseudofs(trans, 878 ip->obj_localization, 879 &error); 880 error = 0; /* ignore ENOENT */ 881 } 882 883 if (error) { 884 hammer_free_inode(ip); 885 ip = NULL; 886 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 887 panic("hammer_create_inode: duplicate obj_id %llx", 888 (long long)ip->obj_id); 889 /* not reached */ 890 hammer_free_inode(ip); 891 } 892 *ipp = ip; 893 return(error); 894 } 895 896 /* 897 * Final cleanup / freeing of an inode structure 898 */ 899 static void 900 hammer_free_inode(hammer_inode_t ip) 901 { 902 struct hammer_mount *hmp; 903 904 hmp = ip->hmp; 905 KKASSERT(hammer_oneref(&ip->lock)); 906 hammer_uncache_node(&ip->cache[0]); 907 hammer_uncache_node(&ip->cache[1]); 908 hammer_uncache_node(&ip->cache[2]); 909 hammer_uncache_node(&ip->cache[3]); 910 hammer_inode_wakereclaims(ip); 911 if (ip->objid_cache) 912 hammer_clear_objid(ip); 913 --hammer_count_inodes; 914 --hmp->count_inodes; 915 if (ip->pfsm) { 916 hammer_rel_pseudofs(hmp, ip->pfsm); 917 ip->pfsm = NULL; 918 } 919 kfree(ip, hmp->m_inodes); 920 ip = NULL; 921 } 922 923 /* 924 * Retrieve pseudo-fs data. NULL will never be returned. 925 * 926 * If an error occurs *errorp will be set and a default template is returned, 927 * otherwise *errorp is set to 0. Typically when an error occurs it will 928 * be ENOENT. 929 */ 930 hammer_pseudofs_inmem_t 931 hammer_load_pseudofs(hammer_transaction_t trans, 932 u_int32_t localization, int *errorp) 933 { 934 hammer_mount_t hmp = trans->hmp; 935 hammer_inode_t ip; 936 hammer_pseudofs_inmem_t pfsm; 937 struct hammer_cursor cursor; 938 int bytes; 939 940 retry: 941 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 942 if (pfsm) { 943 hammer_ref(&pfsm->lock); 944 *errorp = 0; 945 return(pfsm); 946 } 947 948 /* 949 * PFS records are stored in the root inode (not the PFS root inode, 950 * but the real root). Avoid an infinite recursion if loading 951 * the PFS for the real root. 952 */ 953 if (localization) { 954 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 955 HAMMER_MAX_TID, 956 HAMMER_DEF_LOCALIZATION, 0, errorp); 957 } else { 958 ip = NULL; 959 } 960 961 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 962 pfsm->localization = localization; 963 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 964 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 965 966 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 967 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION + 968 HAMMER_LOCALIZE_MISC; 969 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 970 cursor.key_beg.create_tid = 0; 971 cursor.key_beg.delete_tid = 0; 972 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 973 cursor.key_beg.obj_type = 0; 974 cursor.key_beg.key = localization; 975 cursor.asof = HAMMER_MAX_TID; 976 cursor.flags |= HAMMER_CURSOR_ASOF; 977 978 if (ip) 979 *errorp = hammer_ip_lookup(&cursor); 980 else 981 *errorp = hammer_btree_lookup(&cursor); 982 if (*errorp == 0) { 983 *errorp = hammer_ip_resolve_data(&cursor); 984 if (*errorp == 0) { 985 if (cursor.data->pfsd.mirror_flags & 986 HAMMER_PFSD_DELETED) { 987 *errorp = ENOENT; 988 } else { 989 bytes = cursor.leaf->data_len; 990 if (bytes > sizeof(pfsm->pfsd)) 991 bytes = sizeof(pfsm->pfsd); 992 bcopy(cursor.data, &pfsm->pfsd, bytes); 993 } 994 } 995 } 996 hammer_done_cursor(&cursor); 997 998 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 999 hammer_ref(&pfsm->lock); 1000 if (ip) 1001 hammer_rel_inode(ip, 0); 1002 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 1003 kfree(pfsm, hmp->m_misc); 1004 goto retry; 1005 } 1006 return(pfsm); 1007 } 1008 1009 /* 1010 * Store pseudo-fs data. The backend will automatically delete any prior 1011 * on-disk pseudo-fs data but we have to delete in-memory versions. 1012 */ 1013 int 1014 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 1015 { 1016 struct hammer_cursor cursor; 1017 hammer_record_t record; 1018 hammer_inode_t ip; 1019 int error; 1020 1021 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1022 HAMMER_DEF_LOCALIZATION, 0, &error); 1023 retry: 1024 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 1025 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 1026 cursor.key_beg.localization = ip->obj_localization + 1027 HAMMER_LOCALIZE_MISC; 1028 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 1029 cursor.key_beg.create_tid = 0; 1030 cursor.key_beg.delete_tid = 0; 1031 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 1032 cursor.key_beg.obj_type = 0; 1033 cursor.key_beg.key = pfsm->localization; 1034 cursor.asof = HAMMER_MAX_TID; 1035 cursor.flags |= HAMMER_CURSOR_ASOF; 1036 1037 /* 1038 * Replace any in-memory version of the record. 1039 */ 1040 error = hammer_ip_lookup(&cursor); 1041 if (error == 0 && hammer_cursor_inmem(&cursor)) { 1042 record = cursor.iprec; 1043 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 1044 KKASSERT(cursor.deadlk_rec == NULL); 1045 hammer_ref(&record->lock); 1046 cursor.deadlk_rec = record; 1047 error = EDEADLK; 1048 } else { 1049 record->flags |= HAMMER_RECF_DELETED_FE; 1050 error = 0; 1051 } 1052 } 1053 1054 /* 1055 * Allocate replacement general record. The backend flush will 1056 * delete any on-disk version of the record. 1057 */ 1058 if (error == 0 || error == ENOENT) { 1059 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 1060 record->type = HAMMER_MEM_RECORD_GENERAL; 1061 1062 record->leaf.base.localization = ip->obj_localization + 1063 HAMMER_LOCALIZE_MISC; 1064 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 1065 record->leaf.base.key = pfsm->localization; 1066 record->leaf.data_len = sizeof(pfsm->pfsd); 1067 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 1068 error = hammer_ip_add_record(trans, record); 1069 } 1070 hammer_done_cursor(&cursor); 1071 if (error == EDEADLK) 1072 goto retry; 1073 hammer_rel_inode(ip, 0); 1074 return(error); 1075 } 1076 1077 /* 1078 * Create a root directory for a PFS if one does not alredy exist. 1079 * 1080 * The PFS root stands alone so we must also bump the nlinks count 1081 * to prevent it from being destroyed on release. 1082 */ 1083 int 1084 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 1085 hammer_pseudofs_inmem_t pfsm) 1086 { 1087 hammer_inode_t ip; 1088 struct vattr vap; 1089 int error; 1090 1091 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 1092 pfsm->localization, 0, &error); 1093 if (ip == NULL) { 1094 vattr_null(&vap); 1095 vap.va_mode = 0755; 1096 vap.va_type = VDIR; 1097 error = hammer_create_inode(trans, &vap, cred, 1098 NULL, NULL, 0, 1099 pfsm, &ip); 1100 if (error == 0) { 1101 ++ip->ino_data.nlinks; 1102 hammer_modify_inode(trans, ip, HAMMER_INODE_DDIRTY); 1103 } 1104 } 1105 if (ip) 1106 hammer_rel_inode(ip, 0); 1107 return(error); 1108 } 1109 1110 /* 1111 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 1112 * if we are unable to disassociate all the inodes. 1113 */ 1114 static 1115 int 1116 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 1117 { 1118 int res; 1119 1120 hammer_ref(&ip->lock); 1121 if (hammer_isactive(&ip->lock) == 2 && ip->vp) 1122 vclean_unlocked(ip->vp); 1123 if (hammer_isactive(&ip->lock) == 1 && ip->vp == NULL) 1124 res = 0; 1125 else 1126 res = -1; /* stop, someone is using the inode */ 1127 hammer_rel_inode(ip, 0); 1128 return(res); 1129 } 1130 1131 int 1132 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization) 1133 { 1134 int res; 1135 int try; 1136 1137 for (try = res = 0; try < 4; ++try) { 1138 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 1139 hammer_inode_pfs_cmp, 1140 hammer_unload_pseudofs_callback, 1141 &localization); 1142 if (res == 0 && try > 1) 1143 break; 1144 hammer_flusher_sync(trans->hmp); 1145 } 1146 if (res != 0) 1147 res = ENOTEMPTY; 1148 return(res); 1149 } 1150 1151 1152 /* 1153 * Release a reference on a PFS 1154 */ 1155 void 1156 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 1157 { 1158 hammer_rel(&pfsm->lock); 1159 if (hammer_norefs(&pfsm->lock)) { 1160 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 1161 kfree(pfsm, hmp->m_misc); 1162 } 1163 } 1164 1165 /* 1166 * Called by hammer_sync_inode(). 1167 */ 1168 static int 1169 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 1170 { 1171 hammer_transaction_t trans = cursor->trans; 1172 hammer_record_t record; 1173 int error; 1174 int redirty; 1175 1176 retry: 1177 error = 0; 1178 1179 /* 1180 * If the inode has a presence on-disk then locate it and mark 1181 * it deleted, setting DELONDISK. 1182 * 1183 * The record may or may not be physically deleted, depending on 1184 * the retention policy. 1185 */ 1186 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 1187 HAMMER_INODE_ONDISK) { 1188 hammer_normalize_cursor(cursor); 1189 cursor->key_beg.localization = ip->obj_localization + 1190 HAMMER_LOCALIZE_INODE; 1191 cursor->key_beg.obj_id = ip->obj_id; 1192 cursor->key_beg.key = 0; 1193 cursor->key_beg.create_tid = 0; 1194 cursor->key_beg.delete_tid = 0; 1195 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1196 cursor->key_beg.obj_type = 0; 1197 cursor->asof = ip->obj_asof; 1198 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1199 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 1200 cursor->flags |= HAMMER_CURSOR_BACKEND; 1201 1202 error = hammer_btree_lookup(cursor); 1203 if (hammer_debug_inode) 1204 kprintf("IPDEL %p %08x %d", ip, ip->flags, error); 1205 1206 if (error == 0) { 1207 error = hammer_ip_delete_record(cursor, ip, trans->tid); 1208 if (hammer_debug_inode) 1209 kprintf(" error %d\n", error); 1210 if (error == 0) { 1211 ip->flags |= HAMMER_INODE_DELONDISK; 1212 } 1213 if (cursor->node) 1214 hammer_cache_node(&ip->cache[0], cursor->node); 1215 } 1216 if (error == EDEADLK) { 1217 hammer_done_cursor(cursor); 1218 error = hammer_init_cursor(trans, cursor, 1219 &ip->cache[0], ip); 1220 if (hammer_debug_inode) 1221 kprintf("IPDED %p %d\n", ip, error); 1222 if (error == 0) 1223 goto retry; 1224 } 1225 } 1226 1227 /* 1228 * Ok, write out the initial record or a new record (after deleting 1229 * the old one), unless the DELETED flag is set. This routine will 1230 * clear DELONDISK if it writes out a record. 1231 * 1232 * Update our inode statistics if this is the first application of 1233 * the inode on-disk. 1234 */ 1235 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 1236 /* 1237 * Generate a record and write it to the media. We clean-up 1238 * the state before releasing so we do not have to set-up 1239 * a flush_group. 1240 */ 1241 record = hammer_alloc_mem_record(ip, 0); 1242 record->type = HAMMER_MEM_RECORD_INODE; 1243 record->flush_state = HAMMER_FST_FLUSH; 1244 record->leaf = ip->sync_ino_leaf; 1245 record->leaf.base.create_tid = trans->tid; 1246 record->leaf.data_len = sizeof(ip->sync_ino_data); 1247 record->leaf.create_ts = trans->time32; 1248 record->data = (void *)&ip->sync_ino_data; 1249 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1250 1251 /* 1252 * If this flag is set we cannot sync the new file size 1253 * because we haven't finished related truncations. The 1254 * inode will be flushed in another flush group to finish 1255 * the job. 1256 */ 1257 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1258 ip->sync_ino_data.size != ip->ino_data.size) { 1259 redirty = 1; 1260 ip->sync_ino_data.size = ip->ino_data.size; 1261 } else { 1262 redirty = 0; 1263 } 1264 1265 for (;;) { 1266 error = hammer_ip_sync_record_cursor(cursor, record); 1267 if (hammer_debug_inode) 1268 kprintf("GENREC %p rec %08x %d\n", 1269 ip, record->flags, error); 1270 if (error != EDEADLK) 1271 break; 1272 hammer_done_cursor(cursor); 1273 error = hammer_init_cursor(trans, cursor, 1274 &ip->cache[0], ip); 1275 if (hammer_debug_inode) 1276 kprintf("GENREC reinit %d\n", error); 1277 if (error) 1278 break; 1279 } 1280 1281 /* 1282 * Note: The record was never on the inode's record tree 1283 * so just wave our hands importantly and destroy it. 1284 */ 1285 record->flags |= HAMMER_RECF_COMMITTED; 1286 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1287 record->flush_state = HAMMER_FST_IDLE; 1288 ++ip->rec_generation; 1289 hammer_rel_mem_record(record); 1290 1291 /* 1292 * Finish up. 1293 */ 1294 if (error == 0) { 1295 if (hammer_debug_inode) 1296 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1297 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1298 HAMMER_INODE_SDIRTY | 1299 HAMMER_INODE_ATIME | 1300 HAMMER_INODE_MTIME); 1301 ip->flags &= ~HAMMER_INODE_DELONDISK; 1302 if (redirty) 1303 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1304 1305 /* 1306 * Root volume count of inodes 1307 */ 1308 hammer_sync_lock_sh(trans); 1309 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1310 hammer_modify_volume_field(trans, 1311 trans->rootvol, 1312 vol0_stat_inodes); 1313 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1314 hammer_modify_volume_done(trans->rootvol); 1315 ip->flags |= HAMMER_INODE_ONDISK; 1316 if (hammer_debug_inode) 1317 kprintf("NOWONDISK %p\n", ip); 1318 } 1319 hammer_sync_unlock(trans); 1320 } 1321 } 1322 1323 /* 1324 * If the inode has been destroyed, clean out any left-over flags 1325 * that may have been set by the frontend. 1326 */ 1327 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1328 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1329 HAMMER_INODE_SDIRTY | 1330 HAMMER_INODE_ATIME | 1331 HAMMER_INODE_MTIME); 1332 } 1333 return(error); 1334 } 1335 1336 /* 1337 * Update only the itimes fields. 1338 * 1339 * ATIME can be updated without generating any UNDO. MTIME is updated 1340 * with UNDO so it is guaranteed to be synchronized properly in case of 1341 * a crash. 1342 * 1343 * Neither field is included in the B-Tree leaf element's CRC, which is how 1344 * we can get away with updating ATIME the way we do. 1345 */ 1346 static int 1347 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1348 { 1349 hammer_transaction_t trans = cursor->trans; 1350 int error; 1351 1352 retry: 1353 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1354 HAMMER_INODE_ONDISK) { 1355 return(0); 1356 } 1357 1358 hammer_normalize_cursor(cursor); 1359 cursor->key_beg.localization = ip->obj_localization + 1360 HAMMER_LOCALIZE_INODE; 1361 cursor->key_beg.obj_id = ip->obj_id; 1362 cursor->key_beg.key = 0; 1363 cursor->key_beg.create_tid = 0; 1364 cursor->key_beg.delete_tid = 0; 1365 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1366 cursor->key_beg.obj_type = 0; 1367 cursor->asof = ip->obj_asof; 1368 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1369 cursor->flags |= HAMMER_CURSOR_ASOF; 1370 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1371 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1372 cursor->flags |= HAMMER_CURSOR_BACKEND; 1373 1374 error = hammer_btree_lookup(cursor); 1375 if (error == 0) { 1376 hammer_cache_node(&ip->cache[0], cursor->node); 1377 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1378 /* 1379 * Updating MTIME requires an UNDO. Just cover 1380 * both atime and mtime. 1381 */ 1382 hammer_sync_lock_sh(trans); 1383 hammer_modify_buffer(trans, cursor->data_buffer, 1384 HAMMER_ITIMES_BASE(&cursor->data->inode), 1385 HAMMER_ITIMES_BYTES); 1386 cursor->data->inode.atime = ip->sync_ino_data.atime; 1387 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1388 hammer_modify_buffer_done(cursor->data_buffer); 1389 hammer_sync_unlock(trans); 1390 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1391 /* 1392 * Updating atime only can be done in-place with 1393 * no UNDO. 1394 */ 1395 hammer_sync_lock_sh(trans); 1396 hammer_modify_buffer(trans, cursor->data_buffer, 1397 NULL, 0); 1398 cursor->data->inode.atime = ip->sync_ino_data.atime; 1399 hammer_modify_buffer_done(cursor->data_buffer); 1400 hammer_sync_unlock(trans); 1401 } 1402 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1403 } 1404 if (error == EDEADLK) { 1405 hammer_done_cursor(cursor); 1406 error = hammer_init_cursor(trans, cursor, 1407 &ip->cache[0], ip); 1408 if (error == 0) 1409 goto retry; 1410 } 1411 return(error); 1412 } 1413 1414 /* 1415 * Release a reference on an inode, flush as requested. 1416 * 1417 * On the last reference we queue the inode to the flusher for its final 1418 * disposition. 1419 */ 1420 void 1421 hammer_rel_inode(struct hammer_inode *ip, int flush) 1422 { 1423 /*hammer_mount_t hmp = ip->hmp;*/ 1424 1425 /* 1426 * Handle disposition when dropping the last ref. 1427 */ 1428 for (;;) { 1429 if (hammer_oneref(&ip->lock)) { 1430 /* 1431 * Determine whether on-disk action is needed for 1432 * the inode's final disposition. 1433 */ 1434 KKASSERT(ip->vp == NULL); 1435 hammer_inode_unloadable_check(ip, 0); 1436 if (ip->flags & HAMMER_INODE_MODMASK) { 1437 hammer_flush_inode(ip, 0); 1438 } else if (hammer_oneref(&ip->lock)) { 1439 hammer_unload_inode(ip); 1440 break; 1441 } 1442 } else { 1443 if (flush) 1444 hammer_flush_inode(ip, 0); 1445 1446 /* 1447 * The inode still has multiple refs, try to drop 1448 * one ref. 1449 */ 1450 KKASSERT(hammer_isactive(&ip->lock) >= 1); 1451 if (hammer_isactive(&ip->lock) > 1) { 1452 hammer_rel(&ip->lock); 1453 break; 1454 } 1455 } 1456 } 1457 } 1458 1459 /* 1460 * Unload and destroy the specified inode. Must be called with one remaining 1461 * reference. The reference is disposed of. 1462 * 1463 * The inode must be completely clean. 1464 */ 1465 static int 1466 hammer_unload_inode(struct hammer_inode *ip) 1467 { 1468 hammer_mount_t hmp = ip->hmp; 1469 1470 KASSERT(hammer_oneref(&ip->lock), 1471 ("hammer_unload_inode: %d refs\n", hammer_isactive(&ip->lock))); 1472 KKASSERT(ip->vp == NULL); 1473 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1474 KKASSERT(ip->cursor_ip_refs == 0); 1475 KKASSERT(hammer_notlocked(&ip->lock)); 1476 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1477 1478 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1479 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1480 1481 if (ip->flags & HAMMER_INODE_RDIRTY) { 1482 RB_REMOVE(hammer_redo_rb_tree, &hmp->rb_redo_root, ip); 1483 ip->flags &= ~HAMMER_INODE_RDIRTY; 1484 } 1485 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1486 1487 hammer_free_inode(ip); 1488 return(0); 1489 } 1490 1491 /* 1492 * Called during unmounting if a critical error occured. The in-memory 1493 * inode and all related structures are destroyed. 1494 * 1495 * If a critical error did not occur the unmount code calls the standard 1496 * release and asserts that the inode is gone. 1497 */ 1498 int 1499 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1500 { 1501 hammer_record_t rec; 1502 1503 /* 1504 * Get rid of the inodes in-memory records, regardless of their 1505 * state, and clear the mod-mask. 1506 */ 1507 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1508 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1509 rec->target_ip = NULL; 1510 if (rec->flush_state == HAMMER_FST_SETUP) 1511 rec->flush_state = HAMMER_FST_IDLE; 1512 } 1513 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1514 if (rec->flush_state == HAMMER_FST_FLUSH) 1515 --rec->flush_group->refs; 1516 else 1517 hammer_ref(&rec->lock); 1518 KKASSERT(hammer_oneref(&rec->lock)); 1519 rec->flush_state = HAMMER_FST_IDLE; 1520 rec->flush_group = NULL; 1521 rec->flags |= HAMMER_RECF_DELETED_FE; /* wave hands */ 1522 rec->flags |= HAMMER_RECF_DELETED_BE; /* wave hands */ 1523 ++ip->rec_generation; 1524 hammer_rel_mem_record(rec); 1525 } 1526 ip->flags &= ~HAMMER_INODE_MODMASK; 1527 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1528 KKASSERT(ip->vp == NULL); 1529 1530 /* 1531 * Remove the inode from any flush group, force it idle. FLUSH 1532 * and SETUP states have an inode ref. 1533 */ 1534 switch(ip->flush_state) { 1535 case HAMMER_FST_FLUSH: 1536 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 1537 --ip->flush_group->refs; 1538 ip->flush_group = NULL; 1539 /* fall through */ 1540 case HAMMER_FST_SETUP: 1541 hammer_rel(&ip->lock); 1542 ip->flush_state = HAMMER_FST_IDLE; 1543 /* fall through */ 1544 case HAMMER_FST_IDLE: 1545 break; 1546 } 1547 1548 /* 1549 * There shouldn't be any associated vnode. The unload needs at 1550 * least one ref, if we do have a vp steal its ip ref. 1551 */ 1552 if (ip->vp) { 1553 kprintf("hammer_destroy_inode_callback: Unexpected " 1554 "vnode association ip %p vp %p\n", ip, ip->vp); 1555 ip->vp->v_data = NULL; 1556 ip->vp = NULL; 1557 } else { 1558 hammer_ref(&ip->lock); 1559 } 1560 hammer_unload_inode(ip); 1561 return(0); 1562 } 1563 1564 /* 1565 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1566 * the read-only flag for cached inodes. 1567 * 1568 * This routine is called from a RB_SCAN(). 1569 */ 1570 int 1571 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1572 { 1573 hammer_mount_t hmp = ip->hmp; 1574 1575 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1576 ip->flags |= HAMMER_INODE_RO; 1577 else 1578 ip->flags &= ~HAMMER_INODE_RO; 1579 return(0); 1580 } 1581 1582 /* 1583 * A transaction has modified an inode, requiring updates as specified by 1584 * the passed flags. 1585 * 1586 * HAMMER_INODE_DDIRTY: Inode data has been updated, not incl mtime/atime, 1587 * and not including size changes due to write-append 1588 * (but other size changes are included). 1589 * HAMMER_INODE_SDIRTY: Inode data has been updated, size changes due to 1590 * write-append. 1591 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1592 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1593 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1594 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1595 */ 1596 void 1597 hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags) 1598 { 1599 /* 1600 * ronly of 0 or 2 does not trigger assertion. 1601 * 2 is a special error state 1602 */ 1603 KKASSERT(ip->hmp->ronly != 1 || 1604 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1605 HAMMER_INODE_SDIRTY | 1606 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1607 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1608 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1609 ip->flags |= HAMMER_INODE_RSV_INODES; 1610 ++ip->hmp->rsv_inodes; 1611 } 1612 1613 /* 1614 * Set the NEWINODE flag in the transaction if the inode 1615 * transitions to a dirty state. This is used to track 1616 * the load on the inode cache. 1617 */ 1618 if (trans && 1619 (ip->flags & HAMMER_INODE_MODMASK) == 0 && 1620 (flags & HAMMER_INODE_MODMASK)) { 1621 trans->flags |= HAMMER_TRANSF_NEWINODE; 1622 } 1623 1624 ip->flags |= flags; 1625 } 1626 1627 /* 1628 * Request that an inode be flushed. This whole mess cannot block and may 1629 * recurse (if not synchronous). Once requested HAMMER will attempt to 1630 * actively flush the inode until the flush can be done. 1631 * 1632 * The inode may already be flushing, or may be in a setup state. We can 1633 * place the inode in a flushing state if it is currently idle and flag it 1634 * to reflush if it is currently flushing. 1635 * 1636 * Upon return if the inode could not be flushed due to a setup 1637 * dependancy, then it will be automatically flushed when the dependancy 1638 * is satisfied. 1639 */ 1640 void 1641 hammer_flush_inode(hammer_inode_t ip, int flags) 1642 { 1643 hammer_mount_t hmp; 1644 hammer_flush_group_t flg; 1645 int good; 1646 1647 /* 1648 * next_flush_group is the first flush group we can place the inode 1649 * in. It may be NULL. If it becomes full we append a new flush 1650 * group and make that the next_flush_group. 1651 */ 1652 hmp = ip->hmp; 1653 while ((flg = hmp->next_flush_group) != NULL) { 1654 KKASSERT(flg->running == 0); 1655 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit) 1656 break; 1657 hmp->next_flush_group = TAILQ_NEXT(flg, flush_entry); 1658 hammer_flusher_async(ip->hmp, flg); 1659 } 1660 if (flg == NULL) { 1661 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1662 hmp->next_flush_group = flg; 1663 RB_INIT(&flg->flush_tree); 1664 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1665 } 1666 1667 /* 1668 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1669 * state we have to put it back into an IDLE state so we can 1670 * drop the extra ref. 1671 * 1672 * If we have a parent dependancy we must still fall through 1673 * so we can run it. 1674 */ 1675 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1676 if (ip->flush_state == HAMMER_FST_SETUP && 1677 TAILQ_EMPTY(&ip->target_list)) { 1678 ip->flush_state = HAMMER_FST_IDLE; 1679 hammer_rel_inode(ip, 0); 1680 } 1681 if (ip->flush_state == HAMMER_FST_IDLE) 1682 return; 1683 } 1684 1685 /* 1686 * Our flush action will depend on the current state. 1687 */ 1688 switch(ip->flush_state) { 1689 case HAMMER_FST_IDLE: 1690 /* 1691 * We have no dependancies and can flush immediately. Some 1692 * our children may not be flushable so we have to re-test 1693 * with that additional knowledge. 1694 */ 1695 hammer_flush_inode_core(ip, flg, flags); 1696 break; 1697 case HAMMER_FST_SETUP: 1698 /* 1699 * Recurse upwards through dependancies via target_list 1700 * and start their flusher actions going if possible. 1701 * 1702 * 'good' is our connectivity. -1 means we have none and 1703 * can't flush, 0 means there weren't any dependancies, and 1704 * 1 means we have good connectivity. 1705 */ 1706 good = hammer_setup_parent_inodes(ip, 0, flg); 1707 1708 if (good >= 0) { 1709 /* 1710 * We can continue if good >= 0. Determine how 1711 * many records under our inode can be flushed (and 1712 * mark them). 1713 */ 1714 hammer_flush_inode_core(ip, flg, flags); 1715 } else { 1716 /* 1717 * Parent has no connectivity, tell it to flush 1718 * us as soon as it does. 1719 * 1720 * The REFLUSH flag is also needed to trigger 1721 * dependancy wakeups. 1722 */ 1723 ip->flags |= HAMMER_INODE_CONN_DOWN | 1724 HAMMER_INODE_REFLUSH; 1725 if (flags & HAMMER_FLUSH_SIGNAL) { 1726 ip->flags |= HAMMER_INODE_RESIGNAL; 1727 hammer_flusher_async(ip->hmp, flg); 1728 } 1729 } 1730 break; 1731 case HAMMER_FST_FLUSH: 1732 /* 1733 * We are already flushing, flag the inode to reflush 1734 * if needed after it completes its current flush. 1735 * 1736 * The REFLUSH flag is also needed to trigger 1737 * dependancy wakeups. 1738 */ 1739 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1740 ip->flags |= HAMMER_INODE_REFLUSH; 1741 if (flags & HAMMER_FLUSH_SIGNAL) { 1742 ip->flags |= HAMMER_INODE_RESIGNAL; 1743 hammer_flusher_async(ip->hmp, flg); 1744 } 1745 break; 1746 } 1747 } 1748 1749 /* 1750 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1751 * ip which reference our ip. 1752 * 1753 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1754 * so for now do not ref/deref the structures. Note that if we use the 1755 * ref/rel code later, the rel CAN block. 1756 */ 1757 static int 1758 hammer_setup_parent_inodes(hammer_inode_t ip, int depth, 1759 hammer_flush_group_t flg) 1760 { 1761 hammer_record_t depend; 1762 int good; 1763 int r; 1764 1765 /* 1766 * If we hit our recursion limit and we have parent dependencies 1767 * We cannot continue. Returning < 0 will cause us to be flagged 1768 * for reflush. Returning -2 cuts off additional dependency checks 1769 * because they are likely to also hit the depth limit. 1770 * 1771 * We cannot return < 0 if there are no dependencies or there might 1772 * not be anything to wakeup (ip). 1773 */ 1774 if (depth == 20 && TAILQ_FIRST(&ip->target_list)) { 1775 kprintf("HAMMER Warning: depth limit reached on " 1776 "setup recursion, inode %p %016llx\n", 1777 ip, (long long)ip->obj_id); 1778 return(-2); 1779 } 1780 1781 /* 1782 * Scan dependencies 1783 */ 1784 good = 0; 1785 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1786 r = hammer_setup_parent_inodes_helper(depend, depth, flg); 1787 KKASSERT(depend->target_ip == ip); 1788 if (r < 0 && good == 0) 1789 good = -1; 1790 if (r > 0) 1791 good = 1; 1792 1793 /* 1794 * If we failed due to the recursion depth limit then stop 1795 * now. 1796 */ 1797 if (r == -2) 1798 break; 1799 } 1800 return(good); 1801 } 1802 1803 /* 1804 * This helper function takes a record representing the dependancy between 1805 * the parent inode and child inode. 1806 * 1807 * record->ip = parent inode 1808 * record->target_ip = child inode 1809 * 1810 * We are asked to recurse upwards and convert the record from SETUP 1811 * to FLUSH if possible. 1812 * 1813 * Return 1 if the record gives us connectivity 1814 * 1815 * Return 0 if the record is not relevant 1816 * 1817 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1818 */ 1819 static int 1820 hammer_setup_parent_inodes_helper(hammer_record_t record, int depth, 1821 hammer_flush_group_t flg) 1822 { 1823 hammer_mount_t hmp; 1824 hammer_inode_t pip; 1825 int good; 1826 1827 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1828 pip = record->ip; 1829 hmp = pip->hmp; 1830 1831 /* 1832 * If the record is already flushing, is it in our flush group? 1833 * 1834 * If it is in our flush group but it is a general record or a 1835 * delete-on-disk, it does not improve our connectivity (return 0), 1836 * and if the target inode is not trying to destroy itself we can't 1837 * allow the operation yet anyway (the second return -1). 1838 */ 1839 if (record->flush_state == HAMMER_FST_FLUSH) { 1840 /* 1841 * If not in our flush group ask the parent to reflush 1842 * us as soon as possible. 1843 */ 1844 if (record->flush_group != flg) { 1845 pip->flags |= HAMMER_INODE_REFLUSH; 1846 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1847 return(-1); 1848 } 1849 1850 /* 1851 * If in our flush group everything is already set up, 1852 * just return whether the record will improve our 1853 * visibility or not. 1854 */ 1855 if (record->type == HAMMER_MEM_RECORD_ADD) 1856 return(1); 1857 return(0); 1858 } 1859 1860 /* 1861 * It must be a setup record. Try to resolve the setup dependancies 1862 * by recursing upwards so we can place ip on the flush list. 1863 * 1864 * Limit ourselves to 20 levels of recursion to avoid blowing out 1865 * the kernel stack. If we hit the recursion limit we can't flush 1866 * until the parent flushes. The parent will flush independantly 1867 * on its own and ultimately a deep recursion will be resolved. 1868 */ 1869 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1870 1871 good = hammer_setup_parent_inodes(pip, depth + 1, flg); 1872 1873 /* 1874 * If good < 0 the parent has no connectivity and we cannot safely 1875 * flush the directory entry, which also means we can't flush our 1876 * ip. Flag us for downward recursion once the parent's 1877 * connectivity is resolved. Flag the parent for [re]flush or it 1878 * may not check for downward recursions. 1879 */ 1880 if (good < 0) { 1881 pip->flags |= HAMMER_INODE_REFLUSH; 1882 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1883 return(good); 1884 } 1885 1886 /* 1887 * We are go, place the parent inode in a flushing state so we can 1888 * place its record in a flushing state. Note that the parent 1889 * may already be flushing. The record must be in the same flush 1890 * group as the parent. 1891 */ 1892 if (pip->flush_state != HAMMER_FST_FLUSH) 1893 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 1894 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 1895 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1896 1897 #if 0 1898 if (record->type == HAMMER_MEM_RECORD_DEL && 1899 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 1900 /* 1901 * Regardless of flushing state we cannot sync this path if the 1902 * record represents a delete-on-disk but the target inode 1903 * is not ready to sync its own deletion. 1904 * 1905 * XXX need to count effective nlinks to determine whether 1906 * the flush is ok, otherwise removing a hardlink will 1907 * just leave the DEL record to rot. 1908 */ 1909 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 1910 return(-1); 1911 } else 1912 #endif 1913 if (pip->flush_group == flg) { 1914 /* 1915 * Because we have not calculated nlinks yet we can just 1916 * set records to the flush state if the parent is in 1917 * the same flush group as we are. 1918 */ 1919 record->flush_state = HAMMER_FST_FLUSH; 1920 record->flush_group = flg; 1921 ++record->flush_group->refs; 1922 hammer_ref(&record->lock); 1923 1924 /* 1925 * A general directory-add contributes to our visibility. 1926 * 1927 * Otherwise it is probably a directory-delete or 1928 * delete-on-disk record and does not contribute to our 1929 * visbility (but we can still flush it). 1930 */ 1931 if (record->type == HAMMER_MEM_RECORD_ADD) 1932 return(1); 1933 return(0); 1934 } else { 1935 /* 1936 * If the parent is not in our flush group we cannot 1937 * flush this record yet, there is no visibility. 1938 * We tell the parent to reflush and mark ourselves 1939 * so the parent knows it should flush us too. 1940 */ 1941 pip->flags |= HAMMER_INODE_REFLUSH; 1942 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1943 return(-1); 1944 } 1945 } 1946 1947 /* 1948 * This is the core routine placing an inode into the FST_FLUSH state. 1949 */ 1950 static void 1951 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 1952 { 1953 int go_count; 1954 1955 /* 1956 * Set flush state and prevent the flusher from cycling into 1957 * the next flush group. Do not place the ip on the list yet. 1958 * Inodes not in the idle state get an extra reference. 1959 */ 1960 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 1961 if (ip->flush_state == HAMMER_FST_IDLE) 1962 hammer_ref(&ip->lock); 1963 ip->flush_state = HAMMER_FST_FLUSH; 1964 ip->flush_group = flg; 1965 ++ip->hmp->flusher.group_lock; 1966 ++ip->hmp->count_iqueued; 1967 ++hammer_count_iqueued; 1968 ++flg->total_count; 1969 hammer_redo_fifo_start_flush(ip); 1970 1971 /* 1972 * If the flush group reaches the autoflush limit we want to signal 1973 * the flusher. This is particularly important for remove()s. 1974 * 1975 * If the default hammer_limit_reclaim is changed via sysctl 1976 * make sure we don't hit a degenerate case where we don't start 1977 * a flush but blocked on further inode ops. 1978 */ 1979 if (flg->total_count == hammer_autoflush || 1980 flg->total_count >= hammer_limit_reclaim / 4) 1981 flags |= HAMMER_FLUSH_SIGNAL; 1982 1983 #if 0 1984 /* 1985 * We need to be able to vfsync/truncate from the backend. 1986 * 1987 * XXX Any truncation from the backend will acquire the vnode 1988 * independently. 1989 */ 1990 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 1991 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 1992 ip->flags |= HAMMER_INODE_VHELD; 1993 vref(ip->vp); 1994 } 1995 #endif 1996 1997 /* 1998 * Figure out how many in-memory records we can actually flush 1999 * (not including inode meta-data, buffers, etc). 2000 */ 2001 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 2002 if (flags & HAMMER_FLUSH_RECURSION) { 2003 /* 2004 * If this is a upwards recursion we do not want to 2005 * recurse down again! 2006 */ 2007 go_count = 1; 2008 #if 0 2009 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2010 /* 2011 * No new records are added if we must complete a flush 2012 * from a previous cycle, but we do have to move the records 2013 * from the previous cycle to the current one. 2014 */ 2015 #if 0 2016 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2017 hammer_syncgrp_child_callback, NULL); 2018 #endif 2019 go_count = 1; 2020 #endif 2021 } else { 2022 /* 2023 * Normal flush, scan records and bring them into the flush. 2024 * Directory adds and deletes are usually skipped (they are 2025 * grouped with the related inode rather then with the 2026 * directory). 2027 * 2028 * go_count can be negative, which means the scan aborted 2029 * due to the flush group being over-full and we should 2030 * flush what we have. 2031 */ 2032 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2033 hammer_setup_child_callback, NULL); 2034 } 2035 2036 /* 2037 * This is a more involved test that includes go_count. If we 2038 * can't flush, flag the inode and return. If go_count is 0 we 2039 * were are unable to flush any records in our rec_tree and 2040 * must ignore the XDIRTY flag. 2041 */ 2042 if (go_count == 0) { 2043 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 2044 --ip->hmp->count_iqueued; 2045 --hammer_count_iqueued; 2046 2047 --flg->total_count; 2048 ip->flush_state = HAMMER_FST_SETUP; 2049 ip->flush_group = NULL; 2050 #if 0 2051 if (ip->flags & HAMMER_INODE_VHELD) { 2052 ip->flags &= ~HAMMER_INODE_VHELD; 2053 vrele(ip->vp); 2054 } 2055 #endif 2056 2057 /* 2058 * REFLUSH is needed to trigger dependancy wakeups 2059 * when an inode is in SETUP. 2060 */ 2061 ip->flags |= HAMMER_INODE_REFLUSH; 2062 if (flags & HAMMER_FLUSH_SIGNAL) { 2063 ip->flags |= HAMMER_INODE_RESIGNAL; 2064 hammer_flusher_async(ip->hmp, flg); 2065 } 2066 if (--ip->hmp->flusher.group_lock == 0) 2067 wakeup(&ip->hmp->flusher.group_lock); 2068 return; 2069 } 2070 } 2071 2072 /* 2073 * Snapshot the state of the inode for the backend flusher. 2074 * 2075 * We continue to retain save_trunc_off even when all truncations 2076 * have been resolved as an optimization to determine if we can 2077 * skip the B-Tree lookup for overwrite deletions. 2078 * 2079 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 2080 * and stays in ip->flags. Once set, it stays set until the 2081 * inode is destroyed. 2082 */ 2083 if (ip->flags & HAMMER_INODE_TRUNCATED) { 2084 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 2085 ip->sync_trunc_off = ip->trunc_off; 2086 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 2087 ip->flags &= ~HAMMER_INODE_TRUNCATED; 2088 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 2089 2090 /* 2091 * The save_trunc_off used to cache whether the B-Tree 2092 * holds any records past that point is not used until 2093 * after the truncation has succeeded, so we can safely 2094 * set it now. 2095 */ 2096 if (ip->save_trunc_off > ip->sync_trunc_off) 2097 ip->save_trunc_off = ip->sync_trunc_off; 2098 } 2099 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 2100 ~HAMMER_INODE_TRUNCATED); 2101 ip->sync_ino_leaf = ip->ino_leaf; 2102 ip->sync_ino_data = ip->ino_data; 2103 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 2104 #ifdef DEBUG_TRUNCATE 2105 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp) 2106 kprintf("truncateS %016llx\n", ip->sync_trunc_off); 2107 #endif 2108 2109 /* 2110 * The flusher list inherits our inode and reference. 2111 */ 2112 KKASSERT(flg->running == 0); 2113 RB_INSERT(hammer_fls_rb_tree, &flg->flush_tree, ip); 2114 if (--ip->hmp->flusher.group_lock == 0) 2115 wakeup(&ip->hmp->flusher.group_lock); 2116 2117 if (flags & HAMMER_FLUSH_SIGNAL) { 2118 hammer_flusher_async(ip->hmp, flg); 2119 } 2120 } 2121 2122 /* 2123 * Callback for scan of ip->rec_tree. Try to include each record in our 2124 * flush. ip->flush_group has been set but the inode has not yet been 2125 * moved into a flushing state. 2126 * 2127 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 2128 * both inodes. 2129 * 2130 * We return 1 for any record placed or found in FST_FLUSH, which prevents 2131 * the caller from shortcutting the flush. 2132 */ 2133 static int 2134 hammer_setup_child_callback(hammer_record_t rec, void *data) 2135 { 2136 hammer_flush_group_t flg; 2137 hammer_inode_t target_ip; 2138 hammer_inode_t ip; 2139 int r; 2140 2141 /* 2142 * Records deleted or committed by the backend are ignored. 2143 * Note that the flush detects deleted frontend records at 2144 * multiple points to deal with races. This is just the first 2145 * line of defense. The only time HAMMER_RECF_DELETED_FE cannot 2146 * be set is when HAMMER_RECF_INTERLOCK_BE is set, because it 2147 * messes up link-count calculations. 2148 * 2149 * NOTE: Don't get confused between record deletion and, say, 2150 * directory entry deletion. The deletion of a directory entry 2151 * which is on-media has nothing to do with the record deletion 2152 * flags. 2153 */ 2154 if (rec->flags & (HAMMER_RECF_DELETED_FE | HAMMER_RECF_DELETED_BE | 2155 HAMMER_RECF_COMMITTED)) { 2156 if (rec->flush_state == HAMMER_FST_FLUSH) { 2157 KKASSERT(rec->flush_group == rec->ip->flush_group); 2158 r = 1; 2159 } else { 2160 r = 0; 2161 } 2162 return(r); 2163 } 2164 2165 /* 2166 * If the record is in an idle state it has no dependancies and 2167 * can be flushed. 2168 */ 2169 ip = rec->ip; 2170 flg = ip->flush_group; 2171 r = 0; 2172 2173 switch(rec->flush_state) { 2174 case HAMMER_FST_IDLE: 2175 /* 2176 * The record has no setup dependancy, we can flush it. 2177 */ 2178 KKASSERT(rec->target_ip == NULL); 2179 rec->flush_state = HAMMER_FST_FLUSH; 2180 rec->flush_group = flg; 2181 ++flg->refs; 2182 hammer_ref(&rec->lock); 2183 r = 1; 2184 break; 2185 case HAMMER_FST_SETUP: 2186 /* 2187 * The record has a setup dependancy. These are typically 2188 * directory entry adds and deletes. Such entries will be 2189 * flushed when their inodes are flushed so we do not 2190 * usually have to add them to the flush here. However, 2191 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 2192 * it is asking us to flush this record (and it). 2193 */ 2194 target_ip = rec->target_ip; 2195 KKASSERT(target_ip != NULL); 2196 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 2197 2198 /* 2199 * If the target IP is already flushing in our group 2200 * we could associate the record, but target_ip has 2201 * already synced ino_data to sync_ino_data and we 2202 * would also have to adjust nlinks. Plus there are 2203 * ordering issues for adds and deletes. 2204 * 2205 * Reflush downward if this is an ADD, and upward if 2206 * this is a DEL. 2207 */ 2208 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 2209 if (rec->flush_state == HAMMER_MEM_RECORD_ADD) 2210 ip->flags |= HAMMER_INODE_REFLUSH; 2211 else 2212 target_ip->flags |= HAMMER_INODE_REFLUSH; 2213 break; 2214 } 2215 2216 /* 2217 * Target IP is not yet flushing. This can get complex 2218 * because we have to be careful about the recursion. 2219 * 2220 * Directories create an issue for us in that if a flush 2221 * of a directory is requested the expectation is to flush 2222 * any pending directory entries, but this will cause the 2223 * related inodes to recursively flush as well. We can't 2224 * really defer the operation so just get as many as we 2225 * can and 2226 */ 2227 #if 0 2228 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 2229 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 2230 /* 2231 * We aren't reclaiming and the target ip was not 2232 * previously prevented from flushing due to this 2233 * record dependancy. Do not flush this record. 2234 */ 2235 /*r = 0;*/ 2236 } else 2237 #endif 2238 if (flg->total_count + flg->refs > 2239 ip->hmp->undo_rec_limit) { 2240 /* 2241 * Our flush group is over-full and we risk blowing 2242 * out the UNDO FIFO. Stop the scan, flush what we 2243 * have, then reflush the directory. 2244 * 2245 * The directory may be forced through multiple 2246 * flush groups before it can be completely 2247 * flushed. 2248 */ 2249 ip->flags |= HAMMER_INODE_RESIGNAL | 2250 HAMMER_INODE_REFLUSH; 2251 r = -1; 2252 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 2253 /* 2254 * If the target IP is not flushing we can force 2255 * it to flush, even if it is unable to write out 2256 * any of its own records we have at least one in 2257 * hand that we CAN deal with. 2258 */ 2259 rec->flush_state = HAMMER_FST_FLUSH; 2260 rec->flush_group = flg; 2261 ++flg->refs; 2262 hammer_ref(&rec->lock); 2263 hammer_flush_inode_core(target_ip, flg, 2264 HAMMER_FLUSH_RECURSION); 2265 r = 1; 2266 } else { 2267 /* 2268 * General or delete-on-disk record. 2269 * 2270 * XXX this needs help. If a delete-on-disk we could 2271 * disconnect the target. If the target has its own 2272 * dependancies they really need to be flushed. 2273 * 2274 * XXX 2275 */ 2276 rec->flush_state = HAMMER_FST_FLUSH; 2277 rec->flush_group = flg; 2278 ++flg->refs; 2279 hammer_ref(&rec->lock); 2280 hammer_flush_inode_core(target_ip, flg, 2281 HAMMER_FLUSH_RECURSION); 2282 r = 1; 2283 } 2284 break; 2285 case HAMMER_FST_FLUSH: 2286 /* 2287 * The flush_group should already match. 2288 */ 2289 KKASSERT(rec->flush_group == flg); 2290 r = 1; 2291 break; 2292 } 2293 return(r); 2294 } 2295 2296 #if 0 2297 /* 2298 * This version just moves records already in a flush state to the new 2299 * flush group and that is it. 2300 */ 2301 static int 2302 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 2303 { 2304 hammer_inode_t ip = rec->ip; 2305 2306 switch(rec->flush_state) { 2307 case HAMMER_FST_FLUSH: 2308 KKASSERT(rec->flush_group == ip->flush_group); 2309 break; 2310 default: 2311 break; 2312 } 2313 return(0); 2314 } 2315 #endif 2316 2317 /* 2318 * Wait for a previously queued flush to complete. 2319 * 2320 * If a critical error occured we don't try to wait. 2321 */ 2322 void 2323 hammer_wait_inode(hammer_inode_t ip) 2324 { 2325 hammer_flush_group_t flg; 2326 2327 flg = NULL; 2328 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2329 while (ip->flush_state != HAMMER_FST_IDLE && 2330 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2331 if (ip->flush_state == HAMMER_FST_SETUP) 2332 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2333 if (ip->flush_state != HAMMER_FST_IDLE) { 2334 ip->flags |= HAMMER_INODE_FLUSHW; 2335 tsleep(&ip->flags, 0, "hmrwin", 0); 2336 } 2337 } 2338 } 2339 } 2340 2341 /* 2342 * Called by the backend code when a flush has been completed. 2343 * The inode has already been removed from the flush list. 2344 * 2345 * A pipelined flush can occur, in which case we must re-enter the 2346 * inode on the list and re-copy its fields. 2347 */ 2348 void 2349 hammer_flush_inode_done(hammer_inode_t ip, int error) 2350 { 2351 hammer_mount_t hmp; 2352 int dorel; 2353 2354 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2355 2356 hmp = ip->hmp; 2357 2358 /* 2359 * Auto-reflush if the backend could not completely flush 2360 * the inode. This fixes a case where a deferred buffer flush 2361 * could cause fsync to return early. 2362 */ 2363 if (ip->sync_flags & HAMMER_INODE_MODMASK) 2364 ip->flags |= HAMMER_INODE_REFLUSH; 2365 2366 /* 2367 * Merge left-over flags back into the frontend and fix the state. 2368 * Incomplete truncations are retained by the backend. 2369 */ 2370 ip->error = error; 2371 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2372 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2373 2374 /* 2375 * The backend may have adjusted nlinks, so if the adjusted nlinks 2376 * does not match the fronttend set the frontend's DDIRTY flag again. 2377 */ 2378 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2379 ip->flags |= HAMMER_INODE_DDIRTY; 2380 2381 /* 2382 * Fix up the dirty buffer status. 2383 */ 2384 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2385 ip->flags |= HAMMER_INODE_BUFS; 2386 } 2387 hammer_redo_fifo_end_flush(ip); 2388 2389 /* 2390 * Re-set the XDIRTY flag if some of the inode's in-memory records 2391 * could not be flushed. 2392 */ 2393 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2394 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2395 (!RB_EMPTY(&ip->rec_tree) && 2396 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2397 2398 /* 2399 * Do not lose track of inodes which no longer have vnode 2400 * assocations, otherwise they may never get flushed again. 2401 * 2402 * The reflush flag can be set superfluously, causing extra pain 2403 * for no reason. If the inode is no longer modified it no longer 2404 * needs to be flushed. 2405 */ 2406 if (ip->flags & HAMMER_INODE_MODMASK) { 2407 if (ip->vp == NULL) 2408 ip->flags |= HAMMER_INODE_REFLUSH; 2409 } else { 2410 ip->flags &= ~HAMMER_INODE_REFLUSH; 2411 } 2412 2413 /* 2414 * Adjust the flush state. 2415 */ 2416 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2417 /* 2418 * We were unable to flush out all our records, leave the 2419 * inode in a flush state and in the current flush group. 2420 * The flush group will be re-run. 2421 * 2422 * This occurs if the UNDO block gets too full or there is 2423 * too much dirty meta-data and allows the flusher to 2424 * finalize the UNDO block and then re-flush. 2425 */ 2426 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2427 dorel = 0; 2428 } else { 2429 /* 2430 * Remove from the flush_group 2431 */ 2432 RB_REMOVE(hammer_fls_rb_tree, &ip->flush_group->flush_tree, ip); 2433 ip->flush_group = NULL; 2434 2435 #if 0 2436 /* 2437 * Clean up the vnode ref and tracking counts. 2438 */ 2439 if (ip->flags & HAMMER_INODE_VHELD) { 2440 ip->flags &= ~HAMMER_INODE_VHELD; 2441 vrele(ip->vp); 2442 } 2443 #endif 2444 --hmp->count_iqueued; 2445 --hammer_count_iqueued; 2446 2447 /* 2448 * And adjust the state. 2449 */ 2450 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2451 ip->flush_state = HAMMER_FST_IDLE; 2452 dorel = 1; 2453 } else { 2454 ip->flush_state = HAMMER_FST_SETUP; 2455 dorel = 0; 2456 } 2457 2458 /* 2459 * If the frontend is waiting for a flush to complete, 2460 * wake it up. 2461 */ 2462 if (ip->flags & HAMMER_INODE_FLUSHW) { 2463 ip->flags &= ~HAMMER_INODE_FLUSHW; 2464 wakeup(&ip->flags); 2465 } 2466 2467 /* 2468 * If the frontend made more changes and requested another 2469 * flush, then try to get it running. 2470 * 2471 * Reflushes are aborted when the inode is errored out. 2472 */ 2473 if (ip->flags & HAMMER_INODE_REFLUSH) { 2474 ip->flags &= ~HAMMER_INODE_REFLUSH; 2475 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2476 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2477 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2478 } else { 2479 hammer_flush_inode(ip, 0); 2480 } 2481 } 2482 } 2483 2484 /* 2485 * If we have no parent dependancies we can clear CONN_DOWN 2486 */ 2487 if (TAILQ_EMPTY(&ip->target_list)) 2488 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2489 2490 /* 2491 * If the inode is now clean drop the space reservation. 2492 */ 2493 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2494 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2495 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2496 --hmp->rsv_inodes; 2497 } 2498 2499 if (dorel) 2500 hammer_rel_inode(ip, 0); 2501 } 2502 2503 /* 2504 * Called from hammer_sync_inode() to synchronize in-memory records 2505 * to the media. 2506 */ 2507 static int 2508 hammer_sync_record_callback(hammer_record_t record, void *data) 2509 { 2510 hammer_cursor_t cursor = data; 2511 hammer_transaction_t trans = cursor->trans; 2512 hammer_mount_t hmp = trans->hmp; 2513 int error; 2514 2515 /* 2516 * Skip records that do not belong to the current flush. 2517 */ 2518 ++hammer_stats_record_iterations; 2519 if (record->flush_state != HAMMER_FST_FLUSH) 2520 return(0); 2521 2522 #if 1 2523 if (record->flush_group != record->ip->flush_group) { 2524 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group); 2525 if (hammer_debug_critical) 2526 Debugger("blah2"); 2527 return(0); 2528 } 2529 #endif 2530 KKASSERT(record->flush_group == record->ip->flush_group); 2531 2532 /* 2533 * Interlock the record using the BE flag. Once BE is set the 2534 * frontend cannot change the state of FE. 2535 * 2536 * NOTE: If FE is set prior to us setting BE we still sync the 2537 * record out, but the flush completion code converts it to 2538 * a delete-on-disk record instead of destroying it. 2539 */ 2540 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2541 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2542 2543 /* 2544 * The backend has already disposed of the record. 2545 */ 2546 if (record->flags & (HAMMER_RECF_DELETED_BE | HAMMER_RECF_COMMITTED)) { 2547 error = 0; 2548 goto done; 2549 } 2550 2551 /* 2552 * If the whole inode is being deleting all on-disk records will 2553 * be deleted very soon, we can't sync any new records to disk 2554 * because they will be deleted in the same transaction they were 2555 * created in (delete_tid == create_tid), which will assert. 2556 * 2557 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2558 * that we currently panic on. 2559 */ 2560 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2561 switch(record->type) { 2562 case HAMMER_MEM_RECORD_DATA: 2563 /* 2564 * We don't have to do anything, if the record was 2565 * committed the space will have been accounted for 2566 * in the blockmap. 2567 */ 2568 /* fall through */ 2569 case HAMMER_MEM_RECORD_GENERAL: 2570 /* 2571 * Set deleted-by-backend flag. Do not set the 2572 * backend committed flag, because we are throwing 2573 * the record away. 2574 */ 2575 record->flags |= HAMMER_RECF_DELETED_BE; 2576 ++record->ip->rec_generation; 2577 error = 0; 2578 goto done; 2579 case HAMMER_MEM_RECORD_ADD: 2580 panic("hammer_sync_record_callback: illegal add " 2581 "during inode deletion record %p", record); 2582 break; /* NOT REACHED */ 2583 case HAMMER_MEM_RECORD_INODE: 2584 panic("hammer_sync_record_callback: attempt to " 2585 "sync inode record %p?", record); 2586 break; /* NOT REACHED */ 2587 case HAMMER_MEM_RECORD_DEL: 2588 /* 2589 * Follow through and issue the on-disk deletion 2590 */ 2591 break; 2592 } 2593 } 2594 2595 /* 2596 * If DELETED_FE is set special handling is needed for directory 2597 * entries. Dependant pieces related to the directory entry may 2598 * have already been synced to disk. If this occurs we have to 2599 * sync the directory entry and then change the in-memory record 2600 * from an ADD to a DELETE to cover the fact that it's been 2601 * deleted by the frontend. 2602 * 2603 * A directory delete covering record (MEM_RECORD_DEL) can never 2604 * be deleted by the frontend. 2605 * 2606 * Any other record type (aka DATA) can be deleted by the frontend. 2607 * XXX At the moment the flusher must skip it because there may 2608 * be another data record in the flush group for the same block, 2609 * meaning that some frontend data changes can leak into the backend's 2610 * synchronization point. 2611 */ 2612 if (record->flags & HAMMER_RECF_DELETED_FE) { 2613 if (record->type == HAMMER_MEM_RECORD_ADD) { 2614 /* 2615 * Convert a front-end deleted directory-add to 2616 * a directory-delete entry later. 2617 */ 2618 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2619 } else { 2620 /* 2621 * Dispose of the record (race case). Mark as 2622 * deleted by backend (and not committed). 2623 */ 2624 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2625 record->flags |= HAMMER_RECF_DELETED_BE; 2626 ++record->ip->rec_generation; 2627 error = 0; 2628 goto done; 2629 } 2630 } 2631 2632 /* 2633 * Assign the create_tid for new records. Deletions already 2634 * have the record's entire key properly set up. 2635 */ 2636 if (record->type != HAMMER_MEM_RECORD_DEL) { 2637 record->leaf.base.create_tid = trans->tid; 2638 record->leaf.create_ts = trans->time32; 2639 } 2640 2641 /* 2642 * This actually moves the record to the on-media B-Tree. We 2643 * must also generate REDO_TERM entries in the UNDO/REDO FIFO 2644 * indicating that the related REDO_WRITE(s) have been committed. 2645 * 2646 * During recovery any REDO_TERM's within the nominal recovery span 2647 * are ignored since the related meta-data is being undone, causing 2648 * any matching REDO_WRITEs to execute. The REDO_TERMs outside 2649 * the nominal recovery span will match against REDO_WRITEs and 2650 * prevent them from being executed (because the meta-data has 2651 * already been synchronized). 2652 */ 2653 if (record->flags & HAMMER_RECF_REDO) { 2654 KKASSERT(record->type == HAMMER_MEM_RECORD_DATA); 2655 hammer_generate_redo(trans, record->ip, 2656 record->leaf.base.key - 2657 record->leaf.data_len, 2658 HAMMER_REDO_TERM_WRITE, 2659 NULL, 2660 record->leaf.data_len); 2661 } 2662 for (;;) { 2663 error = hammer_ip_sync_record_cursor(cursor, record); 2664 if (error != EDEADLK) 2665 break; 2666 hammer_done_cursor(cursor); 2667 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2668 record->ip); 2669 if (error) 2670 break; 2671 } 2672 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2673 2674 if (error) 2675 error = -error; 2676 done: 2677 hammer_flush_record_done(record, error); 2678 2679 /* 2680 * Do partial finalization if we have built up too many dirty 2681 * buffers. Otherwise a buffer cache deadlock can occur when 2682 * doing things like creating tens of thousands of tiny files. 2683 * 2684 * We must release our cursor lock to avoid a 3-way deadlock 2685 * due to the exclusive sync lock the finalizer must get. 2686 * 2687 * WARNING: See warnings in hammer_unlock_cursor() function. 2688 */ 2689 if (hammer_flusher_meta_limit(hmp)) { 2690 hammer_unlock_cursor(cursor); 2691 hammer_flusher_finalize(trans, 0); 2692 hammer_lock_cursor(cursor); 2693 } 2694 2695 return(error); 2696 } 2697 2698 /* 2699 * Backend function called by the flusher to sync an inode to media. 2700 */ 2701 int 2702 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2703 { 2704 struct hammer_cursor cursor; 2705 hammer_node_t tmp_node; 2706 hammer_record_t depend; 2707 hammer_record_t next; 2708 int error, tmp_error; 2709 u_int64_t nlinks; 2710 2711 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2712 return(0); 2713 2714 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2715 if (error) 2716 goto done; 2717 2718 /* 2719 * Any directory records referencing this inode which are not in 2720 * our current flush group must adjust our nlink count for the 2721 * purposes of synchronizating to disk. 2722 * 2723 * Records which are in our flush group can be unlinked from our 2724 * inode now, potentially allowing the inode to be physically 2725 * deleted. 2726 * 2727 * This cannot block. 2728 */ 2729 nlinks = ip->ino_data.nlinks; 2730 next = TAILQ_FIRST(&ip->target_list); 2731 while ((depend = next) != NULL) { 2732 next = TAILQ_NEXT(depend, target_entry); 2733 if (depend->flush_state == HAMMER_FST_FLUSH && 2734 depend->flush_group == ip->flush_group) { 2735 /* 2736 * If this is an ADD that was deleted by the frontend 2737 * the frontend nlinks count will have already been 2738 * decremented, but the backend is going to sync its 2739 * directory entry and must account for it. The 2740 * record will be converted to a delete-on-disk when 2741 * it gets synced. 2742 * 2743 * If the ADD was not deleted by the frontend we 2744 * can remove the dependancy from our target_list. 2745 */ 2746 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2747 ++nlinks; 2748 } else { 2749 TAILQ_REMOVE(&ip->target_list, depend, 2750 target_entry); 2751 depend->target_ip = NULL; 2752 } 2753 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2754 /* 2755 * Not part of our flush group and not deleted by 2756 * the front-end, adjust the link count synced to 2757 * the media (undo what the frontend did when it 2758 * queued the record). 2759 */ 2760 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2761 switch(depend->type) { 2762 case HAMMER_MEM_RECORD_ADD: 2763 --nlinks; 2764 break; 2765 case HAMMER_MEM_RECORD_DEL: 2766 ++nlinks; 2767 break; 2768 default: 2769 break; 2770 } 2771 } 2772 } 2773 2774 /* 2775 * Set dirty if we had to modify the link count. 2776 */ 2777 if (ip->sync_ino_data.nlinks != nlinks) { 2778 KKASSERT((int64_t)nlinks >= 0); 2779 ip->sync_ino_data.nlinks = nlinks; 2780 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2781 } 2782 2783 /* 2784 * If there is a trunction queued destroy any data past the (aligned) 2785 * truncation point. Userland will have dealt with the buffer 2786 * containing the truncation point for us. 2787 * 2788 * We don't flush pending frontend data buffers until after we've 2789 * dealt with the truncation. 2790 */ 2791 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2792 /* 2793 * Interlock trunc_off. The VOP front-end may continue to 2794 * make adjustments to it while we are blocked. 2795 */ 2796 off_t trunc_off; 2797 off_t aligned_trunc_off; 2798 int blkmask; 2799 2800 trunc_off = ip->sync_trunc_off; 2801 blkmask = hammer_blocksize(trunc_off) - 1; 2802 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2803 2804 /* 2805 * Delete any whole blocks on-media. The front-end has 2806 * already cleaned out any partial block and made it 2807 * pending. The front-end may have updated trunc_off 2808 * while we were blocked so we only use sync_trunc_off. 2809 * 2810 * This operation can blow out the buffer cache, EWOULDBLOCK 2811 * means we were unable to complete the deletion. The 2812 * deletion will update sync_trunc_off in that case. 2813 */ 2814 error = hammer_ip_delete_range(&cursor, ip, 2815 aligned_trunc_off, 2816 0x7FFFFFFFFFFFFFFFLL, 2); 2817 if (error == EWOULDBLOCK) { 2818 ip->flags |= HAMMER_INODE_WOULDBLOCK; 2819 error = 0; 2820 goto defer_buffer_flush; 2821 } 2822 2823 if (error) 2824 goto done; 2825 2826 /* 2827 * Generate a REDO_TERM_TRUNC entry in the UNDO/REDO FIFO. 2828 * 2829 * XXX we do this even if we did not previously generate 2830 * a REDO_TRUNC record. This operation may enclosed the 2831 * range for multiple prior truncation entries in the REDO 2832 * log. 2833 */ 2834 if (trans->hmp->version >= HAMMER_VOL_VERSION_FOUR && 2835 (ip->flags & HAMMER_INODE_RDIRTY)) { 2836 hammer_generate_redo(trans, ip, aligned_trunc_off, 2837 HAMMER_REDO_TERM_TRUNC, 2838 NULL, 0); 2839 } 2840 2841 /* 2842 * Clear the truncation flag on the backend after we have 2843 * completed the deletions. Backend data is now good again 2844 * (including new records we are about to sync, below). 2845 * 2846 * Leave sync_trunc_off intact. As we write additional 2847 * records the backend will update sync_trunc_off. This 2848 * tells the backend whether it can skip the overwrite 2849 * test. This should work properly even when the backend 2850 * writes full blocks where the truncation point straddles 2851 * the block because the comparison is against the base 2852 * offset of the record. 2853 */ 2854 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2855 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 2856 } else { 2857 error = 0; 2858 } 2859 2860 /* 2861 * Now sync related records. These will typically be directory 2862 * entries, records tracking direct-writes, or delete-on-disk records. 2863 */ 2864 if (error == 0) { 2865 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2866 hammer_sync_record_callback, &cursor); 2867 if (tmp_error < 0) 2868 tmp_error = -error; 2869 if (tmp_error) 2870 error = tmp_error; 2871 } 2872 hammer_cache_node(&ip->cache[1], cursor.node); 2873 2874 /* 2875 * Re-seek for inode update, assuming our cache hasn't been ripped 2876 * out from under us. 2877 */ 2878 if (error == 0) { 2879 tmp_node = hammer_ref_node_safe(trans, &ip->cache[0], &error); 2880 if (tmp_node) { 2881 hammer_cursor_downgrade(&cursor); 2882 hammer_lock_sh(&tmp_node->lock); 2883 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 2884 hammer_cursor_seek(&cursor, tmp_node, 0); 2885 hammer_unlock(&tmp_node->lock); 2886 hammer_rel_node(tmp_node); 2887 } 2888 error = 0; 2889 } 2890 2891 /* 2892 * If we are deleting the inode the frontend had better not have 2893 * any active references on elements making up the inode. 2894 * 2895 * The call to hammer_ip_delete_clean() cleans up auxillary records 2896 * but not DB or DATA records. Those must have already been deleted 2897 * by the normal truncation mechanic. 2898 */ 2899 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 2900 RB_EMPTY(&ip->rec_tree) && 2901 (ip->sync_flags & HAMMER_INODE_DELETING) && 2902 (ip->flags & HAMMER_INODE_DELETED) == 0) { 2903 int count1 = 0; 2904 2905 error = hammer_ip_delete_clean(&cursor, ip, &count1); 2906 if (error == 0) { 2907 ip->flags |= HAMMER_INODE_DELETED; 2908 ip->sync_flags &= ~HAMMER_INODE_DELETING; 2909 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2910 KKASSERT(RB_EMPTY(&ip->rec_tree)); 2911 2912 /* 2913 * Set delete_tid in both the frontend and backend 2914 * copy of the inode record. The DELETED flag handles 2915 * this, do not set DDIRTY. 2916 */ 2917 ip->ino_leaf.base.delete_tid = trans->tid; 2918 ip->sync_ino_leaf.base.delete_tid = trans->tid; 2919 ip->ino_leaf.delete_ts = trans->time32; 2920 ip->sync_ino_leaf.delete_ts = trans->time32; 2921 2922 2923 /* 2924 * Adjust the inode count in the volume header 2925 */ 2926 hammer_sync_lock_sh(trans); 2927 if (ip->flags & HAMMER_INODE_ONDISK) { 2928 hammer_modify_volume_field(trans, 2929 trans->rootvol, 2930 vol0_stat_inodes); 2931 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 2932 hammer_modify_volume_done(trans->rootvol); 2933 } 2934 hammer_sync_unlock(trans); 2935 } 2936 } 2937 2938 if (error) 2939 goto done; 2940 ip->sync_flags &= ~HAMMER_INODE_BUFS; 2941 2942 defer_buffer_flush: 2943 /* 2944 * Now update the inode's on-disk inode-data and/or on-disk record. 2945 * DELETED and ONDISK are managed only in ip->flags. 2946 * 2947 * In the case of a defered buffer flush we still update the on-disk 2948 * inode to satisfy visibility requirements if there happen to be 2949 * directory dependancies. 2950 */ 2951 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 2952 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 2953 /* 2954 * If deleted and on-disk, don't set any additional flags. 2955 * the delete flag takes care of things. 2956 * 2957 * Clear flags which may have been set by the frontend. 2958 */ 2959 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2960 HAMMER_INODE_SDIRTY | 2961 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2962 HAMMER_INODE_DELETING); 2963 break; 2964 case HAMMER_INODE_DELETED: 2965 /* 2966 * Take care of the case where a deleted inode was never 2967 * flushed to the disk in the first place. 2968 * 2969 * Clear flags which may have been set by the frontend. 2970 */ 2971 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2972 HAMMER_INODE_SDIRTY | 2973 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2974 HAMMER_INODE_DELETING); 2975 while (RB_ROOT(&ip->rec_tree)) { 2976 hammer_record_t record = RB_ROOT(&ip->rec_tree); 2977 hammer_ref(&record->lock); 2978 KKASSERT(hammer_oneref(&record->lock)); 2979 record->flags |= HAMMER_RECF_DELETED_BE; 2980 ++record->ip->rec_generation; 2981 hammer_rel_mem_record(record); 2982 } 2983 break; 2984 case HAMMER_INODE_ONDISK: 2985 /* 2986 * If already on-disk, do not set any additional flags. 2987 */ 2988 break; 2989 default: 2990 /* 2991 * If not on-disk and not deleted, set DDIRTY to force 2992 * an initial record to be written. 2993 * 2994 * Also set the create_tid in both the frontend and backend 2995 * copy of the inode record. 2996 */ 2997 ip->ino_leaf.base.create_tid = trans->tid; 2998 ip->ino_leaf.create_ts = trans->time32; 2999 ip->sync_ino_leaf.base.create_tid = trans->tid; 3000 ip->sync_ino_leaf.create_ts = trans->time32; 3001 ip->sync_flags |= HAMMER_INODE_DDIRTY; 3002 break; 3003 } 3004 3005 /* 3006 * If DDIRTY or SDIRTY is set, write out a new record. 3007 * If the inode is already on-disk the old record is marked as 3008 * deleted. 3009 * 3010 * If DELETED is set hammer_update_inode() will delete the existing 3011 * record without writing out a new one. 3012 * 3013 * If *ONLY* the ITIMES flag is set we can update the record in-place. 3014 */ 3015 if (ip->flags & HAMMER_INODE_DELETED) { 3016 error = hammer_update_inode(&cursor, ip); 3017 } else 3018 if (!(ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY)) && 3019 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 3020 error = hammer_update_itimes(&cursor, ip); 3021 } else 3022 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_SDIRTY | 3023 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 3024 error = hammer_update_inode(&cursor, ip); 3025 } 3026 done: 3027 if (error) { 3028 hammer_critical_error(ip->hmp, ip, error, 3029 "while syncing inode"); 3030 } 3031 hammer_done_cursor(&cursor); 3032 return(error); 3033 } 3034 3035 /* 3036 * This routine is called when the OS is no longer actively referencing 3037 * the inode (but might still be keeping it cached), or when releasing 3038 * the last reference to an inode. 3039 * 3040 * At this point if the inode's nlinks count is zero we want to destroy 3041 * it, which may mean destroying it on-media too. 3042 */ 3043 void 3044 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 3045 { 3046 struct vnode *vp; 3047 3048 /* 3049 * Set the DELETING flag when the link count drops to 0 and the 3050 * OS no longer has any opens on the inode. 3051 * 3052 * The backend will clear DELETING (a mod flag) and set DELETED 3053 * (a state flag) when it is actually able to perform the 3054 * operation. 3055 * 3056 * Don't reflag the deletion if the flusher is currently syncing 3057 * one that was already flagged. A previously set DELETING flag 3058 * may bounce around flags and sync_flags until the operation is 3059 * completely done. 3060 */ 3061 if (ip->ino_data.nlinks == 0 && 3062 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 3063 ip->flags |= HAMMER_INODE_DELETING; 3064 ip->flags |= HAMMER_INODE_TRUNCATED; 3065 ip->trunc_off = 0; 3066 vp = NULL; 3067 if (getvp) { 3068 if (hammer_get_vnode(ip, &vp) != 0) 3069 return; 3070 } 3071 3072 /* 3073 * Final cleanup 3074 */ 3075 if (ip->vp) 3076 nvtruncbuf(ip->vp, 0, HAMMER_BUFSIZE, 0); 3077 if (getvp) 3078 vput(vp); 3079 } 3080 } 3081 3082 /* 3083 * After potentially resolving a dependancy the inode is tested 3084 * to determine whether it needs to be reflushed. 3085 */ 3086 void 3087 hammer_test_inode(hammer_inode_t ip) 3088 { 3089 if (ip->flags & HAMMER_INODE_REFLUSH) { 3090 ip->flags &= ~HAMMER_INODE_REFLUSH; 3091 hammer_ref(&ip->lock); 3092 if (ip->flags & HAMMER_INODE_RESIGNAL) { 3093 ip->flags &= ~HAMMER_INODE_RESIGNAL; 3094 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 3095 } else { 3096 hammer_flush_inode(ip, 0); 3097 } 3098 hammer_rel_inode(ip, 0); 3099 } 3100 } 3101 3102 /* 3103 * Clear the RECLAIM flag on an inode. This occurs when the inode is 3104 * reassociated with a vp or just before it gets freed. 3105 * 3106 * Pipeline wakeups to threads blocked due to an excessive number of 3107 * detached inodes. This typically occurs when atime updates accumulate 3108 * while scanning a directory tree. 3109 */ 3110 static void 3111 hammer_inode_wakereclaims(hammer_inode_t ip) 3112 { 3113 struct hammer_reclaim *reclaim; 3114 hammer_mount_t hmp = ip->hmp; 3115 3116 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 3117 return; 3118 3119 --hammer_count_reclaiming; 3120 --hmp->inode_reclaims; 3121 ip->flags &= ~HAMMER_INODE_RECLAIM; 3122 3123 while ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) { 3124 if (reclaim->count > 0 && --reclaim->count == 0) { 3125 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 3126 wakeup(reclaim); 3127 } 3128 if (hmp->inode_reclaims > hammer_limit_reclaim / 2) 3129 break; 3130 } 3131 } 3132 3133 /* 3134 * Setup our reclaim pipeline. We only let so many detached (and dirty) 3135 * inodes build up before we start blocking. This routine is called 3136 * if a new inode is created or an inode is loaded from media. 3137 * 3138 * When we block we don't care *which* inode has finished reclaiming, 3139 * as lone as one does. 3140 */ 3141 void 3142 hammer_inode_waitreclaims(hammer_transaction_t trans) 3143 { 3144 hammer_mount_t hmp = trans->hmp; 3145 struct hammer_reclaim reclaim; 3146 3147 /* 3148 * Track inode load 3149 */ 3150 if (curthread->td_proc) { 3151 struct hammer_inostats *stats; 3152 int lower_limit; 3153 3154 stats = hammer_inode_inostats(hmp, curthread->td_proc->p_pid); 3155 ++stats->count; 3156 3157 if (stats->count > hammer_limit_reclaim / 2) 3158 stats->count = hammer_limit_reclaim / 2; 3159 lower_limit = hammer_limit_reclaim - stats->count; 3160 if (hammer_debug_general & 0x10000) 3161 kprintf("pid %5d limit %d\n", (int)curthread->td_proc->p_pid, lower_limit); 3162 3163 if (hmp->inode_reclaims < lower_limit) 3164 return; 3165 } else { 3166 /* 3167 * Default mode 3168 */ 3169 if (hmp->inode_reclaims < hammer_limit_reclaim) 3170 return; 3171 } 3172 reclaim.count = 1; 3173 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry); 3174 tsleep(&reclaim, 0, "hmrrcm", hz); 3175 if (reclaim.count > 0) 3176 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 3177 } 3178 3179 /* 3180 * Keep track of reclaim statistics on a per-pid basis using a loose 3181 * 4-way set associative hash table. Collisions inherit the count of 3182 * the previous entry. 3183 * 3184 * NOTE: We want to be careful here to limit the chain size. If the chain 3185 * size is too large a pid will spread its stats out over too many 3186 * entries under certain types of heavy filesystem activity and 3187 * wind up not delaying long enough. 3188 */ 3189 static 3190 struct hammer_inostats * 3191 hammer_inode_inostats(hammer_mount_t hmp, pid_t pid) 3192 { 3193 struct hammer_inostats *stats; 3194 int delta; 3195 int chain; 3196 static int iterator; /* we don't care about MP races */ 3197 3198 /* 3199 * Chain up to 4 times to find our entry. 3200 */ 3201 for (chain = 0; chain < 4; ++chain) { 3202 stats = &hmp->inostats[(pid + chain) & HAMMER_INOSTATS_HMASK]; 3203 if (stats->pid == pid) 3204 break; 3205 } 3206 3207 /* 3208 * Replace one of the four chaining entries with our new entry. 3209 */ 3210 if (chain == 4) { 3211 stats = &hmp->inostats[(pid + (iterator++ & 3)) & 3212 HAMMER_INOSTATS_HMASK]; 3213 stats->pid = pid; 3214 } 3215 3216 /* 3217 * Decay the entry 3218 */ 3219 if (stats->count && stats->ltick != ticks) { 3220 delta = ticks - stats->ltick; 3221 stats->ltick = ticks; 3222 if (delta <= 0 || delta > hz * 60) 3223 stats->count = 0; 3224 else 3225 stats->count = stats->count * hz / (hz + delta); 3226 } 3227 if (hammer_debug_general & 0x10000) 3228 kprintf("pid %5d stats %d\n", (int)pid, stats->count); 3229 return (stats); 3230 } 3231 3232 #if 0 3233 3234 /* 3235 * XXX not used, doesn't work very well due to the large batching nature 3236 * of flushes. 3237 * 3238 * A larger then normal backlog of inodes is sitting in the flusher, 3239 * enforce a general slowdown to let it catch up. This routine is only 3240 * called on completion of a non-flusher-related transaction which 3241 * performed B-Tree node I/O. 3242 * 3243 * It is possible for the flusher to stall in a continuous load. 3244 * blogbench -i1000 -o seems to do a good job generating this sort of load. 3245 * If the flusher is unable to catch up the inode count can bloat until 3246 * we run out of kvm. 3247 * 3248 * This is a bit of a hack. 3249 */ 3250 void 3251 hammer_inode_waithard(hammer_mount_t hmp) 3252 { 3253 /* 3254 * Hysteresis. 3255 */ 3256 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) { 3257 if (hmp->inode_reclaims < hammer_limit_reclaim / 2 && 3258 hmp->count_iqueued < hmp->count_inodes / 20) { 3259 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY; 3260 return; 3261 } 3262 } else { 3263 if (hmp->inode_reclaims < hammer_limit_reclaim || 3264 hmp->count_iqueued < hmp->count_inodes / 10) { 3265 return; 3266 } 3267 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY; 3268 } 3269 3270 /* 3271 * Block for one flush cycle. 3272 */ 3273 hammer_flusher_wait_next(hmp); 3274 } 3275 3276 #endif 3277