1 /* 2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.114 2008/09/24 00:53:51 dillon Exp $ 35 */ 36 37 #include "hammer.h" 38 #include <vm/vm_extern.h> 39 #include <sys/buf.h> 40 #include <sys/buf2.h> 41 42 static int hammer_unload_inode(struct hammer_inode *ip); 43 static void hammer_free_inode(hammer_inode_t ip); 44 static void hammer_flush_inode_core(hammer_inode_t ip, 45 hammer_flush_group_t flg, int flags); 46 static int hammer_setup_child_callback(hammer_record_t rec, void *data); 47 #if 0 48 static int hammer_syncgrp_child_callback(hammer_record_t rec, void *data); 49 #endif 50 static int hammer_setup_parent_inodes(hammer_inode_t ip, 51 hammer_flush_group_t flg); 52 static int hammer_setup_parent_inodes_helper(hammer_record_t record, 53 hammer_flush_group_t flg); 54 static void hammer_inode_wakereclaims(hammer_inode_t ip); 55 56 #ifdef DEBUG_TRUNCATE 57 extern struct hammer_inode *HammerTruncIp; 58 #endif 59 60 /* 61 * RB-Tree support for inode structures 62 */ 63 int 64 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2) 65 { 66 if (ip1->obj_localization < ip2->obj_localization) 67 return(-1); 68 if (ip1->obj_localization > ip2->obj_localization) 69 return(1); 70 if (ip1->obj_id < ip2->obj_id) 71 return(-1); 72 if (ip1->obj_id > ip2->obj_id) 73 return(1); 74 if (ip1->obj_asof < ip2->obj_asof) 75 return(-1); 76 if (ip1->obj_asof > ip2->obj_asof) 77 return(1); 78 return(0); 79 } 80 81 /* 82 * RB-Tree support for inode structures / special LOOKUP_INFO 83 */ 84 static int 85 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip) 86 { 87 if (info->obj_localization < ip->obj_localization) 88 return(-1); 89 if (info->obj_localization > ip->obj_localization) 90 return(1); 91 if (info->obj_id < ip->obj_id) 92 return(-1); 93 if (info->obj_id > ip->obj_id) 94 return(1); 95 if (info->obj_asof < ip->obj_asof) 96 return(-1); 97 if (info->obj_asof > ip->obj_asof) 98 return(1); 99 return(0); 100 } 101 102 /* 103 * Used by hammer_scan_inode_snapshots() to locate all of an object's 104 * snapshots. Note that the asof field is not tested, which we can get 105 * away with because it is the lowest-priority field. 106 */ 107 static int 108 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data) 109 { 110 hammer_inode_info_t info = data; 111 112 if (ip->obj_localization > info->obj_localization) 113 return(1); 114 if (ip->obj_localization < info->obj_localization) 115 return(-1); 116 if (ip->obj_id > info->obj_id) 117 return(1); 118 if (ip->obj_id < info->obj_id) 119 return(-1); 120 return(0); 121 } 122 123 /* 124 * Used by hammer_unload_pseudofs() to locate all inodes associated with 125 * a particular PFS. 126 */ 127 static int 128 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data) 129 { 130 u_int32_t localization = *(u_int32_t *)data; 131 if (ip->obj_localization > localization) 132 return(1); 133 if (ip->obj_localization < localization) 134 return(-1); 135 return(0); 136 } 137 138 /* 139 * RB-Tree support for pseudofs structures 140 */ 141 static int 142 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2) 143 { 144 if (p1->localization < p2->localization) 145 return(-1); 146 if (p1->localization > p2->localization) 147 return(1); 148 return(0); 149 } 150 151 152 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare); 153 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node, 154 hammer_inode_info_cmp, hammer_inode_info_t); 155 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node, 156 hammer_pfs_rb_compare, u_int32_t, localization); 157 158 /* 159 * The kernel is not actively referencing this vnode but is still holding 160 * it cached. 161 * 162 * This is called from the frontend. 163 */ 164 int 165 hammer_vop_inactive(struct vop_inactive_args *ap) 166 { 167 struct hammer_inode *ip = VTOI(ap->a_vp); 168 169 /* 170 * Degenerate case 171 */ 172 if (ip == NULL) { 173 vrecycle(ap->a_vp); 174 return(0); 175 } 176 177 /* 178 * If the inode no longer has visibility in the filesystem try to 179 * recycle it immediately, even if the inode is dirty. Recycling 180 * it quickly allows the system to reclaim buffer cache and VM 181 * resources which can matter a lot in a heavily loaded system. 182 * 183 * This can deadlock in vfsync() if we aren't careful. 184 * 185 * Do not queue the inode to the flusher if we still have visibility, 186 * otherwise namespace calls such as chmod will unnecessarily generate 187 * multiple inode updates. 188 */ 189 hammer_inode_unloadable_check(ip, 0); 190 if (ip->ino_data.nlinks == 0) { 191 if (ip->flags & HAMMER_INODE_MODMASK) 192 hammer_flush_inode(ip, 0); 193 vrecycle(ap->a_vp); 194 } 195 return(0); 196 } 197 198 /* 199 * Release the vnode association. This is typically (but not always) 200 * the last reference on the inode. 201 * 202 * Once the association is lost we are on our own with regards to 203 * flushing the inode. 204 */ 205 int 206 hammer_vop_reclaim(struct vop_reclaim_args *ap) 207 { 208 struct hammer_inode *ip; 209 hammer_mount_t hmp; 210 struct vnode *vp; 211 212 vp = ap->a_vp; 213 214 if ((ip = vp->v_data) != NULL) { 215 hmp = ip->hmp; 216 vp->v_data = NULL; 217 ip->vp = NULL; 218 219 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { 220 ++hammer_count_reclaiming; 221 ++hmp->inode_reclaims; 222 ip->flags |= HAMMER_INODE_RECLAIM; 223 } 224 hammer_rel_inode(ip, 1); 225 } 226 return(0); 227 } 228 229 /* 230 * Return a locked vnode for the specified inode. The inode must be 231 * referenced but NOT LOCKED on entry and will remain referenced on 232 * return. 233 * 234 * Called from the frontend. 235 */ 236 int 237 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) 238 { 239 hammer_mount_t hmp; 240 struct vnode *vp; 241 int error = 0; 242 u_int8_t obj_type; 243 244 hmp = ip->hmp; 245 246 for (;;) { 247 if ((vp = ip->vp) == NULL) { 248 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); 249 if (error) 250 break; 251 hammer_lock_ex(&ip->lock); 252 if (ip->vp != NULL) { 253 hammer_unlock(&ip->lock); 254 vp->v_type = VBAD; 255 vx_put(vp); 256 continue; 257 } 258 hammer_ref(&ip->lock); 259 vp = *vpp; 260 ip->vp = vp; 261 262 obj_type = ip->ino_data.obj_type; 263 vp->v_type = hammer_get_vnode_type(obj_type); 264 265 hammer_inode_wakereclaims(ip); 266 267 switch(ip->ino_data.obj_type) { 268 case HAMMER_OBJTYPE_CDEV: 269 case HAMMER_OBJTYPE_BDEV: 270 vp->v_ops = &hmp->mp->mnt_vn_spec_ops; 271 addaliasu(vp, ip->ino_data.rmajor, 272 ip->ino_data.rminor); 273 break; 274 case HAMMER_OBJTYPE_FIFO: 275 vp->v_ops = &hmp->mp->mnt_vn_fifo_ops; 276 break; 277 default: 278 break; 279 } 280 281 /* 282 * Only mark as the root vnode if the ip is not 283 * historical, otherwise the VFS cache will get 284 * confused. The other half of the special handling 285 * is in hammer_vop_nlookupdotdot(). 286 * 287 * Pseudo-filesystem roots can be accessed via 288 * non-root filesystem paths and setting VROOT may 289 * confuse the namecache. Set VPFSROOT instead. 290 */ 291 if (ip->obj_id == HAMMER_OBJID_ROOT && 292 ip->obj_asof == hmp->asof) { 293 if (ip->obj_localization == 0) 294 vp->v_flag |= VROOT; 295 else 296 vp->v_flag |= VPFSROOT; 297 } 298 299 vp->v_data = (void *)ip; 300 /* vnode locked by getnewvnode() */ 301 /* make related vnode dirty if inode dirty? */ 302 hammer_unlock(&ip->lock); 303 if (vp->v_type == VREG) 304 vinitvmio(vp, ip->ino_data.size); 305 break; 306 } 307 308 /* 309 * loop if the vget fails (aka races), or if the vp 310 * no longer matches ip->vp. 311 */ 312 if (vget(vp, LK_EXCLUSIVE) == 0) { 313 if (vp == ip->vp) 314 break; 315 vput(vp); 316 } 317 } 318 *vpp = vp; 319 return(error); 320 } 321 322 /* 323 * Locate all copies of the inode for obj_id compatible with the specified 324 * asof, reference, and issue the related call-back. This routine is used 325 * for direct-io invalidation and does not create any new inodes. 326 */ 327 void 328 hammer_scan_inode_snapshots(hammer_mount_t hmp, hammer_inode_info_t iinfo, 329 int (*callback)(hammer_inode_t ip, void *data), 330 void *data) 331 { 332 hammer_ino_rb_tree_RB_SCAN(&hmp->rb_inos_root, 333 hammer_inode_info_cmp_all_history, 334 callback, iinfo); 335 } 336 337 /* 338 * Acquire a HAMMER inode. The returned inode is not locked. These functions 339 * do not attach or detach the related vnode (use hammer_get_vnode() for 340 * that). 341 * 342 * The flags argument is only applied for newly created inodes, and only 343 * certain flags are inherited. 344 * 345 * Called from the frontend. 346 */ 347 struct hammer_inode * 348 hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, 349 int64_t obj_id, hammer_tid_t asof, u_int32_t localization, 350 int flags, int *errorp) 351 { 352 hammer_mount_t hmp = trans->hmp; 353 struct hammer_inode_info iinfo; 354 struct hammer_cursor cursor; 355 struct hammer_inode *ip; 356 357 358 /* 359 * Determine if we already have an inode cached. If we do then 360 * we are golden. 361 */ 362 iinfo.obj_id = obj_id; 363 iinfo.obj_asof = asof; 364 iinfo.obj_localization = localization; 365 loop: 366 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 367 if (ip) { 368 hammer_ref(&ip->lock); 369 *errorp = 0; 370 return(ip); 371 } 372 373 /* 374 * Allocate a new inode structure and deal with races later. 375 */ 376 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 377 ++hammer_count_inodes; 378 ++hmp->count_inodes; 379 ip->obj_id = obj_id; 380 ip->obj_asof = iinfo.obj_asof; 381 ip->obj_localization = localization; 382 ip->hmp = hmp; 383 ip->flags = flags & HAMMER_INODE_RO; 384 ip->cache[0].ip = ip; 385 ip->cache[1].ip = ip; 386 if (hmp->ronly) 387 ip->flags |= HAMMER_INODE_RO; 388 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 389 0x7FFFFFFFFFFFFFFFLL; 390 RB_INIT(&ip->rec_tree); 391 TAILQ_INIT(&ip->target_list); 392 hammer_ref(&ip->lock); 393 394 /* 395 * Locate the on-disk inode. If this is a PFS root we always 396 * access the current version of the root inode and (if it is not 397 * a master) always access information under it with a snapshot 398 * TID. 399 */ 400 retry: 401 hammer_init_cursor(trans, &cursor, (dip ? &dip->cache[0] : NULL), NULL); 402 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE; 403 cursor.key_beg.obj_id = ip->obj_id; 404 cursor.key_beg.key = 0; 405 cursor.key_beg.create_tid = 0; 406 cursor.key_beg.delete_tid = 0; 407 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 408 cursor.key_beg.obj_type = 0; 409 410 cursor.asof = iinfo.obj_asof; 411 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 412 HAMMER_CURSOR_ASOF; 413 414 *errorp = hammer_btree_lookup(&cursor); 415 if (*errorp == EDEADLK) { 416 hammer_done_cursor(&cursor); 417 goto retry; 418 } 419 420 /* 421 * On success the B-Tree lookup will hold the appropriate 422 * buffer cache buffers and provide a pointer to the requested 423 * information. Copy the information to the in-memory inode 424 * and cache the B-Tree node to improve future operations. 425 */ 426 if (*errorp == 0) { 427 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 428 ip->ino_data = cursor.data->inode; 429 430 /* 431 * cache[0] tries to cache the location of the object inode. 432 * The assumption is that it is near the directory inode. 433 * 434 * cache[1] tries to cache the location of the object data. 435 * The assumption is that it is near the directory data. 436 */ 437 hammer_cache_node(&ip->cache[0], cursor.node); 438 if (dip && dip->cache[1].node) 439 hammer_cache_node(&ip->cache[1], dip->cache[1].node); 440 441 /* 442 * The file should not contain any data past the file size 443 * stored in the inode. Setting save_trunc_off to the 444 * file size instead of max reduces B-Tree lookup overheads 445 * on append by allowing the flusher to avoid checking for 446 * record overwrites. 447 */ 448 ip->save_trunc_off = ip->ino_data.size; 449 450 /* 451 * Locate and assign the pseudofs management structure to 452 * the inode. 453 */ 454 if (dip && dip->obj_localization == ip->obj_localization) { 455 ip->pfsm = dip->pfsm; 456 hammer_ref(&ip->pfsm->lock); 457 } else { 458 ip->pfsm = hammer_load_pseudofs(trans, 459 ip->obj_localization, 460 errorp); 461 *errorp = 0; /* ignore ENOENT */ 462 } 463 } 464 465 /* 466 * The inode is placed on the red-black tree and will be synced to 467 * the media when flushed or by the filesystem sync. If this races 468 * another instantiation/lookup the insertion will fail. 469 */ 470 if (*errorp == 0) { 471 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 472 hammer_free_inode(ip); 473 hammer_done_cursor(&cursor); 474 goto loop; 475 } 476 ip->flags |= HAMMER_INODE_ONDISK; 477 } else { 478 if (ip->flags & HAMMER_INODE_RSV_INODES) { 479 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 480 --hmp->rsv_inodes; 481 } 482 483 hammer_free_inode(ip); 484 ip = NULL; 485 } 486 hammer_done_cursor(&cursor); 487 trans->flags |= HAMMER_TRANSF_NEWINODE; 488 return (ip); 489 } 490 491 /* 492 * Create a new filesystem object, returning the inode in *ipp. The 493 * returned inode will be referenced. The inode is created in-memory. 494 * 495 * If pfsm is non-NULL the caller wishes to create the root inode for 496 * a master PFS. 497 */ 498 int 499 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 500 struct ucred *cred, hammer_inode_t dip, 501 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 502 { 503 hammer_mount_t hmp; 504 hammer_inode_t ip; 505 uid_t xuid; 506 int error; 507 508 hmp = trans->hmp; 509 510 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 511 ++hammer_count_inodes; 512 ++hmp->count_inodes; 513 514 if (pfsm) { 515 KKASSERT(pfsm->localization != 0); 516 ip->obj_id = HAMMER_OBJID_ROOT; 517 ip->obj_localization = pfsm->localization; 518 } else { 519 KKASSERT(dip != NULL); 520 ip->obj_id = hammer_alloc_objid(hmp, dip); 521 ip->obj_localization = dip->obj_localization; 522 } 523 524 KKASSERT(ip->obj_id != 0); 525 ip->obj_asof = hmp->asof; 526 ip->hmp = hmp; 527 ip->flush_state = HAMMER_FST_IDLE; 528 ip->flags = HAMMER_INODE_DDIRTY | 529 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 530 ip->cache[0].ip = ip; 531 ip->cache[1].ip = ip; 532 533 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 534 /* ip->save_trunc_off = 0; (already zero) */ 535 RB_INIT(&ip->rec_tree); 536 TAILQ_INIT(&ip->target_list); 537 538 ip->ino_data.atime = trans->time; 539 ip->ino_data.mtime = trans->time; 540 ip->ino_data.size = 0; 541 ip->ino_data.nlinks = 0; 542 543 /* 544 * A nohistory designator on the parent directory is inherited by 545 * the child. We will do this even for pseudo-fs creation... the 546 * sysad can turn it off. 547 */ 548 if (dip) { 549 ip->ino_data.uflags = dip->ino_data.uflags & 550 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 551 } 552 553 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 554 ip->ino_leaf.base.localization = ip->obj_localization + 555 HAMMER_LOCALIZE_INODE; 556 ip->ino_leaf.base.obj_id = ip->obj_id; 557 ip->ino_leaf.base.key = 0; 558 ip->ino_leaf.base.create_tid = 0; 559 ip->ino_leaf.base.delete_tid = 0; 560 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 561 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 562 563 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 564 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 565 ip->ino_data.mode = vap->va_mode; 566 ip->ino_data.ctime = trans->time; 567 568 /* 569 * If we are running version 2 or greater we use dirhash algorithm #1 570 * which is semi-sorted. Algorithm #0 was just a pure crc. 571 */ 572 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 573 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 574 ip->ino_data.cap_flags |= HAMMER_INODE_CAP_DIRHASH_ALG1; 575 } 576 } 577 578 /* 579 * Setup the ".." pointer. This only needs to be done for directories 580 * but we do it for all objects as a recovery aid. 581 */ 582 if (dip) 583 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 584 #if 0 585 /* 586 * The parent_obj_localization field only applies to pseudo-fs roots. 587 * XXX this is no longer applicable, PFSs are no longer directly 588 * tied into the parent's directory structure. 589 */ 590 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY && 591 ip->obj_id == HAMMER_OBJID_ROOT) { 592 ip->ino_data.ext.obj.parent_obj_localization = 593 dip->obj_localization; 594 } 595 #endif 596 597 switch(ip->ino_leaf.base.obj_type) { 598 case HAMMER_OBJTYPE_CDEV: 599 case HAMMER_OBJTYPE_BDEV: 600 ip->ino_data.rmajor = vap->va_rmajor; 601 ip->ino_data.rminor = vap->va_rminor; 602 break; 603 default: 604 break; 605 } 606 607 /* 608 * Calculate default uid/gid and overwrite with information from 609 * the vap. 610 */ 611 if (dip) { 612 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 613 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 614 xuid, cred, &vap->va_mode); 615 } else { 616 xuid = 0; 617 } 618 ip->ino_data.mode = vap->va_mode; 619 620 if (vap->va_vaflags & VA_UID_UUID_VALID) 621 ip->ino_data.uid = vap->va_uid_uuid; 622 else if (vap->va_uid != (uid_t)VNOVAL) 623 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 624 else 625 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 626 627 if (vap->va_vaflags & VA_GID_UUID_VALID) 628 ip->ino_data.gid = vap->va_gid_uuid; 629 else if (vap->va_gid != (gid_t)VNOVAL) 630 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 631 else if (dip) 632 ip->ino_data.gid = dip->ino_data.gid; 633 634 hammer_ref(&ip->lock); 635 636 if (pfsm) { 637 ip->pfsm = pfsm; 638 hammer_ref(&pfsm->lock); 639 error = 0; 640 } else if (dip->obj_localization == ip->obj_localization) { 641 ip->pfsm = dip->pfsm; 642 hammer_ref(&ip->pfsm->lock); 643 error = 0; 644 } else { 645 ip->pfsm = hammer_load_pseudofs(trans, 646 ip->obj_localization, 647 &error); 648 error = 0; /* ignore ENOENT */ 649 } 650 651 if (error) { 652 hammer_free_inode(ip); 653 ip = NULL; 654 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 655 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id); 656 /* not reached */ 657 hammer_free_inode(ip); 658 } 659 *ipp = ip; 660 return(error); 661 } 662 663 /* 664 * Final cleanup / freeing of an inode structure 665 */ 666 static void 667 hammer_free_inode(hammer_inode_t ip) 668 { 669 struct hammer_mount *hmp; 670 671 hmp = ip->hmp; 672 KKASSERT(ip->lock.refs == 1); 673 hammer_uncache_node(&ip->cache[0]); 674 hammer_uncache_node(&ip->cache[1]); 675 hammer_inode_wakereclaims(ip); 676 if (ip->objid_cache) 677 hammer_clear_objid(ip); 678 --hammer_count_inodes; 679 --hmp->count_inodes; 680 if (ip->pfsm) { 681 hammer_rel_pseudofs(hmp, ip->pfsm); 682 ip->pfsm = NULL; 683 } 684 kfree(ip, hmp->m_inodes); 685 ip = NULL; 686 } 687 688 /* 689 * Retrieve pseudo-fs data. NULL will never be returned. 690 * 691 * If an error occurs *errorp will be set and a default template is returned, 692 * otherwise *errorp is set to 0. Typically when an error occurs it will 693 * be ENOENT. 694 */ 695 hammer_pseudofs_inmem_t 696 hammer_load_pseudofs(hammer_transaction_t trans, 697 u_int32_t localization, int *errorp) 698 { 699 hammer_mount_t hmp = trans->hmp; 700 hammer_inode_t ip; 701 hammer_pseudofs_inmem_t pfsm; 702 struct hammer_cursor cursor; 703 int bytes; 704 705 retry: 706 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 707 if (pfsm) { 708 hammer_ref(&pfsm->lock); 709 *errorp = 0; 710 return(pfsm); 711 } 712 713 /* 714 * PFS records are stored in the root inode (not the PFS root inode, 715 * but the real root). Avoid an infinite recursion if loading 716 * the PFS for the real root. 717 */ 718 if (localization) { 719 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 720 HAMMER_MAX_TID, 721 HAMMER_DEF_LOCALIZATION, 0, errorp); 722 } else { 723 ip = NULL; 724 } 725 726 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 727 pfsm->localization = localization; 728 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 729 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 730 731 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 732 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION + 733 HAMMER_LOCALIZE_MISC; 734 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 735 cursor.key_beg.create_tid = 0; 736 cursor.key_beg.delete_tid = 0; 737 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 738 cursor.key_beg.obj_type = 0; 739 cursor.key_beg.key = localization; 740 cursor.asof = HAMMER_MAX_TID; 741 cursor.flags |= HAMMER_CURSOR_ASOF; 742 743 if (ip) 744 *errorp = hammer_ip_lookup(&cursor); 745 else 746 *errorp = hammer_btree_lookup(&cursor); 747 if (*errorp == 0) { 748 *errorp = hammer_ip_resolve_data(&cursor); 749 if (*errorp == 0) { 750 if (cursor.data->pfsd.mirror_flags & 751 HAMMER_PFSD_DELETED) { 752 *errorp = ENOENT; 753 } else { 754 bytes = cursor.leaf->data_len; 755 if (bytes > sizeof(pfsm->pfsd)) 756 bytes = sizeof(pfsm->pfsd); 757 bcopy(cursor.data, &pfsm->pfsd, bytes); 758 } 759 } 760 } 761 hammer_done_cursor(&cursor); 762 763 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 764 hammer_ref(&pfsm->lock); 765 if (ip) 766 hammer_rel_inode(ip, 0); 767 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 768 kfree(pfsm, hmp->m_misc); 769 goto retry; 770 } 771 return(pfsm); 772 } 773 774 /* 775 * Store pseudo-fs data. The backend will automatically delete any prior 776 * on-disk pseudo-fs data but we have to delete in-memory versions. 777 */ 778 int 779 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 780 { 781 struct hammer_cursor cursor; 782 hammer_record_t record; 783 hammer_inode_t ip; 784 int error; 785 786 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 787 HAMMER_DEF_LOCALIZATION, 0, &error); 788 retry: 789 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 790 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 791 cursor.key_beg.localization = ip->obj_localization + 792 HAMMER_LOCALIZE_MISC; 793 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 794 cursor.key_beg.create_tid = 0; 795 cursor.key_beg.delete_tid = 0; 796 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 797 cursor.key_beg.obj_type = 0; 798 cursor.key_beg.key = pfsm->localization; 799 cursor.asof = HAMMER_MAX_TID; 800 cursor.flags |= HAMMER_CURSOR_ASOF; 801 802 error = hammer_ip_lookup(&cursor); 803 if (error == 0 && hammer_cursor_inmem(&cursor)) { 804 record = cursor.iprec; 805 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 806 KKASSERT(cursor.deadlk_rec == NULL); 807 hammer_ref(&record->lock); 808 cursor.deadlk_rec = record; 809 error = EDEADLK; 810 } else { 811 record->flags |= HAMMER_RECF_DELETED_FE; 812 error = 0; 813 } 814 } 815 if (error == 0 || error == ENOENT) { 816 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 817 record->type = HAMMER_MEM_RECORD_GENERAL; 818 819 record->leaf.base.localization = ip->obj_localization + 820 HAMMER_LOCALIZE_MISC; 821 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 822 record->leaf.base.key = pfsm->localization; 823 record->leaf.data_len = sizeof(pfsm->pfsd); 824 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 825 error = hammer_ip_add_record(trans, record); 826 } 827 hammer_done_cursor(&cursor); 828 if (error == EDEADLK) 829 goto retry; 830 hammer_rel_inode(ip, 0); 831 return(error); 832 } 833 834 /* 835 * Create a root directory for a PFS if one does not alredy exist. 836 * 837 * The PFS root stands alone so we must also bump the nlinks count 838 * to prevent it from being destroyed on release. 839 */ 840 int 841 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 842 hammer_pseudofs_inmem_t pfsm) 843 { 844 hammer_inode_t ip; 845 struct vattr vap; 846 int error; 847 848 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 849 pfsm->localization, 0, &error); 850 if (ip == NULL) { 851 vattr_null(&vap); 852 vap.va_mode = 0755; 853 vap.va_type = VDIR; 854 error = hammer_create_inode(trans, &vap, cred, NULL, pfsm, &ip); 855 if (error == 0) { 856 ++ip->ino_data.nlinks; 857 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY); 858 } 859 } 860 if (ip) 861 hammer_rel_inode(ip, 0); 862 return(error); 863 } 864 865 /* 866 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 867 * if we are unable to disassociate all the inodes. 868 */ 869 static 870 int 871 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 872 { 873 int res; 874 875 hammer_ref(&ip->lock); 876 if (ip->lock.refs == 2 && ip->vp) 877 vclean_unlocked(ip->vp); 878 if (ip->lock.refs == 1 && ip->vp == NULL) 879 res = 0; 880 else 881 res = -1; /* stop, someone is using the inode */ 882 hammer_rel_inode(ip, 0); 883 return(res); 884 } 885 886 int 887 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization) 888 { 889 int res; 890 int try; 891 892 for (try = res = 0; try < 4; ++try) { 893 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 894 hammer_inode_pfs_cmp, 895 hammer_unload_pseudofs_callback, 896 &localization); 897 if (res == 0 && try > 1) 898 break; 899 hammer_flusher_sync(trans->hmp); 900 } 901 if (res != 0) 902 res = ENOTEMPTY; 903 return(res); 904 } 905 906 907 /* 908 * Release a reference on a PFS 909 */ 910 void 911 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 912 { 913 hammer_unref(&pfsm->lock); 914 if (pfsm->lock.refs == 0) { 915 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 916 kfree(pfsm, hmp->m_misc); 917 } 918 } 919 920 /* 921 * Called by hammer_sync_inode(). 922 */ 923 static int 924 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 925 { 926 hammer_transaction_t trans = cursor->trans; 927 hammer_record_t record; 928 int error; 929 int redirty; 930 931 retry: 932 error = 0; 933 934 /* 935 * If the inode has a presence on-disk then locate it and mark 936 * it deleted, setting DELONDISK. 937 * 938 * The record may or may not be physically deleted, depending on 939 * the retention policy. 940 */ 941 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 942 HAMMER_INODE_ONDISK) { 943 hammer_normalize_cursor(cursor); 944 cursor->key_beg.localization = ip->obj_localization + 945 HAMMER_LOCALIZE_INODE; 946 cursor->key_beg.obj_id = ip->obj_id; 947 cursor->key_beg.key = 0; 948 cursor->key_beg.create_tid = 0; 949 cursor->key_beg.delete_tid = 0; 950 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 951 cursor->key_beg.obj_type = 0; 952 cursor->asof = ip->obj_asof; 953 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 954 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 955 cursor->flags |= HAMMER_CURSOR_BACKEND; 956 957 error = hammer_btree_lookup(cursor); 958 if (hammer_debug_inode) 959 kprintf("IPDEL %p %08x %d", ip, ip->flags, error); 960 961 if (error == 0) { 962 error = hammer_ip_delete_record(cursor, ip, trans->tid); 963 if (hammer_debug_inode) 964 kprintf(" error %d\n", error); 965 if (error == 0) { 966 ip->flags |= HAMMER_INODE_DELONDISK; 967 } 968 if (cursor->node) 969 hammer_cache_node(&ip->cache[0], cursor->node); 970 } 971 if (error == EDEADLK) { 972 hammer_done_cursor(cursor); 973 error = hammer_init_cursor(trans, cursor, 974 &ip->cache[0], ip); 975 if (hammer_debug_inode) 976 kprintf("IPDED %p %d\n", ip, error); 977 if (error == 0) 978 goto retry; 979 } 980 } 981 982 /* 983 * Ok, write out the initial record or a new record (after deleting 984 * the old one), unless the DELETED flag is set. This routine will 985 * clear DELONDISK if it writes out a record. 986 * 987 * Update our inode statistics if this is the first application of 988 * the inode on-disk. 989 */ 990 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 991 /* 992 * Generate a record and write it to the media. We clean-up 993 * the state before releasing so we do not have to set-up 994 * a flush_group. 995 */ 996 record = hammer_alloc_mem_record(ip, 0); 997 record->type = HAMMER_MEM_RECORD_INODE; 998 record->flush_state = HAMMER_FST_FLUSH; 999 record->leaf = ip->sync_ino_leaf; 1000 record->leaf.base.create_tid = trans->tid; 1001 record->leaf.data_len = sizeof(ip->sync_ino_data); 1002 record->leaf.create_ts = trans->time32; 1003 record->data = (void *)&ip->sync_ino_data; 1004 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1005 1006 /* 1007 * If this flag is set we cannot sync the new file size 1008 * because we haven't finished related truncations. The 1009 * inode will be flushed in another flush group to finish 1010 * the job. 1011 */ 1012 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1013 ip->sync_ino_data.size != ip->ino_data.size) { 1014 redirty = 1; 1015 ip->sync_ino_data.size = ip->ino_data.size; 1016 } else { 1017 redirty = 0; 1018 } 1019 1020 for (;;) { 1021 error = hammer_ip_sync_record_cursor(cursor, record); 1022 if (hammer_debug_inode) 1023 kprintf("GENREC %p rec %08x %d\n", 1024 ip, record->flags, error); 1025 if (error != EDEADLK) 1026 break; 1027 hammer_done_cursor(cursor); 1028 error = hammer_init_cursor(trans, cursor, 1029 &ip->cache[0], ip); 1030 if (hammer_debug_inode) 1031 kprintf("GENREC reinit %d\n", error); 1032 if (error) 1033 break; 1034 } 1035 1036 /* 1037 * The record isn't managed by the inode's record tree, 1038 * destroy it whether we succeed or fail. 1039 */ 1040 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1041 record->flags |= HAMMER_RECF_DELETED_FE | HAMMER_RECF_COMMITTED; 1042 record->flush_state = HAMMER_FST_IDLE; 1043 hammer_rel_mem_record(record); 1044 1045 /* 1046 * Finish up. 1047 */ 1048 if (error == 0) { 1049 if (hammer_debug_inode) 1050 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1051 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1052 HAMMER_INODE_ATIME | 1053 HAMMER_INODE_MTIME); 1054 ip->flags &= ~HAMMER_INODE_DELONDISK; 1055 if (redirty) 1056 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1057 1058 /* 1059 * Root volume count of inodes 1060 */ 1061 hammer_sync_lock_sh(trans); 1062 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1063 hammer_modify_volume_field(trans, 1064 trans->rootvol, 1065 vol0_stat_inodes); 1066 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1067 hammer_modify_volume_done(trans->rootvol); 1068 ip->flags |= HAMMER_INODE_ONDISK; 1069 if (hammer_debug_inode) 1070 kprintf("NOWONDISK %p\n", ip); 1071 } 1072 hammer_sync_unlock(trans); 1073 } 1074 } 1075 1076 /* 1077 * If the inode has been destroyed, clean out any left-over flags 1078 * that may have been set by the frontend. 1079 */ 1080 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1081 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1082 HAMMER_INODE_ATIME | 1083 HAMMER_INODE_MTIME); 1084 } 1085 return(error); 1086 } 1087 1088 /* 1089 * Update only the itimes fields. 1090 * 1091 * ATIME can be updated without generating any UNDO. MTIME is updated 1092 * with UNDO so it is guaranteed to be synchronized properly in case of 1093 * a crash. 1094 * 1095 * Neither field is included in the B-Tree leaf element's CRC, which is how 1096 * we can get away with updating ATIME the way we do. 1097 */ 1098 static int 1099 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1100 { 1101 hammer_transaction_t trans = cursor->trans; 1102 int error; 1103 1104 retry: 1105 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1106 HAMMER_INODE_ONDISK) { 1107 return(0); 1108 } 1109 1110 hammer_normalize_cursor(cursor); 1111 cursor->key_beg.localization = ip->obj_localization + 1112 HAMMER_LOCALIZE_INODE; 1113 cursor->key_beg.obj_id = ip->obj_id; 1114 cursor->key_beg.key = 0; 1115 cursor->key_beg.create_tid = 0; 1116 cursor->key_beg.delete_tid = 0; 1117 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1118 cursor->key_beg.obj_type = 0; 1119 cursor->asof = ip->obj_asof; 1120 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1121 cursor->flags |= HAMMER_CURSOR_ASOF; 1122 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1123 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1124 cursor->flags |= HAMMER_CURSOR_BACKEND; 1125 1126 error = hammer_btree_lookup(cursor); 1127 if (error == 0) { 1128 hammer_cache_node(&ip->cache[0], cursor->node); 1129 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1130 /* 1131 * Updating MTIME requires an UNDO. Just cover 1132 * both atime and mtime. 1133 */ 1134 hammer_sync_lock_sh(trans); 1135 hammer_modify_buffer(trans, cursor->data_buffer, 1136 HAMMER_ITIMES_BASE(&cursor->data->inode), 1137 HAMMER_ITIMES_BYTES); 1138 cursor->data->inode.atime = ip->sync_ino_data.atime; 1139 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1140 hammer_modify_buffer_done(cursor->data_buffer); 1141 hammer_sync_unlock(trans); 1142 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1143 /* 1144 * Updating atime only can be done in-place with 1145 * no UNDO. 1146 */ 1147 hammer_sync_lock_sh(trans); 1148 hammer_modify_buffer(trans, cursor->data_buffer, 1149 NULL, 0); 1150 cursor->data->inode.atime = ip->sync_ino_data.atime; 1151 hammer_modify_buffer_done(cursor->data_buffer); 1152 hammer_sync_unlock(trans); 1153 } 1154 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1155 } 1156 if (error == EDEADLK) { 1157 hammer_done_cursor(cursor); 1158 error = hammer_init_cursor(trans, cursor, 1159 &ip->cache[0], ip); 1160 if (error == 0) 1161 goto retry; 1162 } 1163 return(error); 1164 } 1165 1166 /* 1167 * Release a reference on an inode, flush as requested. 1168 * 1169 * On the last reference we queue the inode to the flusher for its final 1170 * disposition. 1171 */ 1172 void 1173 hammer_rel_inode(struct hammer_inode *ip, int flush) 1174 { 1175 /*hammer_mount_t hmp = ip->hmp;*/ 1176 1177 /* 1178 * Handle disposition when dropping the last ref. 1179 */ 1180 for (;;) { 1181 if (ip->lock.refs == 1) { 1182 /* 1183 * Determine whether on-disk action is needed for 1184 * the inode's final disposition. 1185 */ 1186 KKASSERT(ip->vp == NULL); 1187 hammer_inode_unloadable_check(ip, 0); 1188 if (ip->flags & HAMMER_INODE_MODMASK) { 1189 hammer_flush_inode(ip, 0); 1190 } else if (ip->lock.refs == 1) { 1191 hammer_unload_inode(ip); 1192 break; 1193 } 1194 } else { 1195 if (flush) 1196 hammer_flush_inode(ip, 0); 1197 1198 /* 1199 * The inode still has multiple refs, try to drop 1200 * one ref. 1201 */ 1202 KKASSERT(ip->lock.refs >= 1); 1203 if (ip->lock.refs > 1) { 1204 hammer_unref(&ip->lock); 1205 break; 1206 } 1207 } 1208 } 1209 } 1210 1211 /* 1212 * Unload and destroy the specified inode. Must be called with one remaining 1213 * reference. The reference is disposed of. 1214 * 1215 * The inode must be completely clean. 1216 */ 1217 static int 1218 hammer_unload_inode(struct hammer_inode *ip) 1219 { 1220 hammer_mount_t hmp = ip->hmp; 1221 1222 KASSERT(ip->lock.refs == 1, 1223 ("hammer_unload_inode: %d refs\n", ip->lock.refs)); 1224 KKASSERT(ip->vp == NULL); 1225 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1226 KKASSERT(ip->cursor_ip_refs == 0); 1227 KKASSERT(ip->lock.lockcount == 0); 1228 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1229 1230 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1231 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1232 1233 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1234 1235 hammer_free_inode(ip); 1236 return(0); 1237 } 1238 1239 /* 1240 * Called during unmounting if a critical error occured. The in-memory 1241 * inode and all related structures are destroyed. 1242 * 1243 * If a critical error did not occur the unmount code calls the standard 1244 * release and asserts that the inode is gone. 1245 */ 1246 int 1247 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1248 { 1249 hammer_record_t rec; 1250 1251 /* 1252 * Get rid of the inodes in-memory records, regardless of their 1253 * state, and clear the mod-mask. 1254 */ 1255 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1256 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1257 rec->target_ip = NULL; 1258 if (rec->flush_state == HAMMER_FST_SETUP) 1259 rec->flush_state = HAMMER_FST_IDLE; 1260 } 1261 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1262 if (rec->flush_state == HAMMER_FST_FLUSH) 1263 --rec->flush_group->refs; 1264 else 1265 hammer_ref(&rec->lock); 1266 KKASSERT(rec->lock.refs == 1); 1267 rec->flush_state = HAMMER_FST_IDLE; 1268 rec->flush_group = NULL; 1269 rec->flags |= HAMMER_RECF_DELETED_FE; 1270 rec->flags |= HAMMER_RECF_DELETED_BE; 1271 hammer_rel_mem_record(rec); 1272 } 1273 ip->flags &= ~HAMMER_INODE_MODMASK; 1274 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1275 KKASSERT(ip->vp == NULL); 1276 1277 /* 1278 * Remove the inode from any flush group, force it idle. FLUSH 1279 * and SETUP states have an inode ref. 1280 */ 1281 switch(ip->flush_state) { 1282 case HAMMER_FST_FLUSH: 1283 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 1284 --ip->flush_group->refs; 1285 ip->flush_group = NULL; 1286 /* fall through */ 1287 case HAMMER_FST_SETUP: 1288 hammer_unref(&ip->lock); 1289 ip->flush_state = HAMMER_FST_IDLE; 1290 /* fall through */ 1291 case HAMMER_FST_IDLE: 1292 break; 1293 } 1294 1295 /* 1296 * There shouldn't be any associated vnode. The unload needs at 1297 * least one ref, if we do have a vp steal its ip ref. 1298 */ 1299 if (ip->vp) { 1300 kprintf("hammer_destroy_inode_callback: Unexpected " 1301 "vnode association ip %p vp %p\n", ip, ip->vp); 1302 ip->vp->v_data = NULL; 1303 ip->vp = NULL; 1304 } else { 1305 hammer_ref(&ip->lock); 1306 } 1307 hammer_unload_inode(ip); 1308 return(0); 1309 } 1310 1311 /* 1312 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1313 * the read-only flag for cached inodes. 1314 * 1315 * This routine is called from a RB_SCAN(). 1316 */ 1317 int 1318 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1319 { 1320 hammer_mount_t hmp = ip->hmp; 1321 1322 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1323 ip->flags |= HAMMER_INODE_RO; 1324 else 1325 ip->flags &= ~HAMMER_INODE_RO; 1326 return(0); 1327 } 1328 1329 /* 1330 * A transaction has modified an inode, requiring updates as specified by 1331 * the passed flags. 1332 * 1333 * HAMMER_INODE_DDIRTY: Inode data has been updated 1334 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1335 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1336 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1337 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1338 */ 1339 void 1340 hammer_modify_inode(hammer_inode_t ip, int flags) 1341 { 1342 /* 1343 * ronly of 0 or 2 does not trigger assertion. 1344 * 2 is a special error state 1345 */ 1346 KKASSERT(ip->hmp->ronly != 1 || 1347 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1348 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1349 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1350 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1351 ip->flags |= HAMMER_INODE_RSV_INODES; 1352 ++ip->hmp->rsv_inodes; 1353 } 1354 1355 ip->flags |= flags; 1356 } 1357 1358 /* 1359 * Request that an inode be flushed. This whole mess cannot block and may 1360 * recurse (if not synchronous). Once requested HAMMER will attempt to 1361 * actively flush the inode until the flush can be done. 1362 * 1363 * The inode may already be flushing, or may be in a setup state. We can 1364 * place the inode in a flushing state if it is currently idle and flag it 1365 * to reflush if it is currently flushing. 1366 * 1367 * Upon return if the inode could not be flushed due to a setup 1368 * dependancy, then it will be automatically flushed when the dependancy 1369 * is satisfied. 1370 */ 1371 void 1372 hammer_flush_inode(hammer_inode_t ip, int flags) 1373 { 1374 hammer_mount_t hmp; 1375 hammer_flush_group_t flg; 1376 int good; 1377 1378 /* 1379 * next_flush_group is the first flush group we can place the inode 1380 * in. It may be NULL. If it becomes full we append a new flush 1381 * group and make that the next_flush_group. 1382 */ 1383 hmp = ip->hmp; 1384 while ((flg = hmp->next_flush_group) != NULL) { 1385 KKASSERT(flg->running == 0); 1386 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit) 1387 break; 1388 hmp->next_flush_group = TAILQ_NEXT(flg, flush_entry); 1389 hammer_flusher_async(ip->hmp, flg); 1390 } 1391 if (flg == NULL) { 1392 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1393 hmp->next_flush_group = flg; 1394 TAILQ_INIT(&flg->flush_list); 1395 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1396 } 1397 1398 /* 1399 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1400 * state we have to put it back into an IDLE state so we can 1401 * drop the extra ref. 1402 * 1403 * If we have a parent dependancy we must still fall through 1404 * so we can run it. 1405 */ 1406 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1407 if (ip->flush_state == HAMMER_FST_SETUP && 1408 TAILQ_EMPTY(&ip->target_list)) { 1409 ip->flush_state = HAMMER_FST_IDLE; 1410 hammer_rel_inode(ip, 0); 1411 } 1412 if (ip->flush_state == HAMMER_FST_IDLE) 1413 return; 1414 } 1415 1416 /* 1417 * Our flush action will depend on the current state. 1418 */ 1419 switch(ip->flush_state) { 1420 case HAMMER_FST_IDLE: 1421 /* 1422 * We have no dependancies and can flush immediately. Some 1423 * our children may not be flushable so we have to re-test 1424 * with that additional knowledge. 1425 */ 1426 hammer_flush_inode_core(ip, flg, flags); 1427 break; 1428 case HAMMER_FST_SETUP: 1429 /* 1430 * Recurse upwards through dependancies via target_list 1431 * and start their flusher actions going if possible. 1432 * 1433 * 'good' is our connectivity. -1 means we have none and 1434 * can't flush, 0 means there weren't any dependancies, and 1435 * 1 means we have good connectivity. 1436 */ 1437 good = hammer_setup_parent_inodes(ip, flg); 1438 1439 if (good >= 0) { 1440 /* 1441 * We can continue if good >= 0. Determine how 1442 * many records under our inode can be flushed (and 1443 * mark them). 1444 */ 1445 hammer_flush_inode_core(ip, flg, flags); 1446 } else { 1447 /* 1448 * Parent has no connectivity, tell it to flush 1449 * us as soon as it does. 1450 * 1451 * The REFLUSH flag is also needed to trigger 1452 * dependancy wakeups. 1453 */ 1454 ip->flags |= HAMMER_INODE_CONN_DOWN | 1455 HAMMER_INODE_REFLUSH; 1456 if (flags & HAMMER_FLUSH_SIGNAL) { 1457 ip->flags |= HAMMER_INODE_RESIGNAL; 1458 hammer_flusher_async(ip->hmp, flg); 1459 } 1460 } 1461 break; 1462 case HAMMER_FST_FLUSH: 1463 /* 1464 * We are already flushing, flag the inode to reflush 1465 * if needed after it completes its current flush. 1466 * 1467 * The REFLUSH flag is also needed to trigger 1468 * dependancy wakeups. 1469 */ 1470 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1471 ip->flags |= HAMMER_INODE_REFLUSH; 1472 if (flags & HAMMER_FLUSH_SIGNAL) { 1473 ip->flags |= HAMMER_INODE_RESIGNAL; 1474 hammer_flusher_async(ip->hmp, flg); 1475 } 1476 break; 1477 } 1478 } 1479 1480 /* 1481 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1482 * ip which reference our ip. 1483 * 1484 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1485 * so for now do not ref/deref the structures. Note that if we use the 1486 * ref/rel code later, the rel CAN block. 1487 */ 1488 static int 1489 hammer_setup_parent_inodes(hammer_inode_t ip, hammer_flush_group_t flg) 1490 { 1491 hammer_record_t depend; 1492 int good; 1493 int r; 1494 1495 good = 0; 1496 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1497 r = hammer_setup_parent_inodes_helper(depend, flg); 1498 KKASSERT(depend->target_ip == ip); 1499 if (r < 0 && good == 0) 1500 good = -1; 1501 if (r > 0) 1502 good = 1; 1503 } 1504 return(good); 1505 } 1506 1507 /* 1508 * This helper function takes a record representing the dependancy between 1509 * the parent inode and child inode. 1510 * 1511 * record->ip = parent inode 1512 * record->target_ip = child inode 1513 * 1514 * We are asked to recurse upwards and convert the record from SETUP 1515 * to FLUSH if possible. 1516 * 1517 * Return 1 if the record gives us connectivity 1518 * 1519 * Return 0 if the record is not relevant 1520 * 1521 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1522 */ 1523 static int 1524 hammer_setup_parent_inodes_helper(hammer_record_t record, 1525 hammer_flush_group_t flg) 1526 { 1527 hammer_mount_t hmp; 1528 hammer_inode_t pip; 1529 int good; 1530 1531 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1532 pip = record->ip; 1533 hmp = pip->hmp; 1534 1535 /* 1536 * If the record is already flushing, is it in our flush group? 1537 * 1538 * If it is in our flush group but it is a general record or a 1539 * delete-on-disk, it does not improve our connectivity (return 0), 1540 * and if the target inode is not trying to destroy itself we can't 1541 * allow the operation yet anyway (the second return -1). 1542 */ 1543 if (record->flush_state == HAMMER_FST_FLUSH) { 1544 /* 1545 * If not in our flush group ask the parent to reflush 1546 * us as soon as possible. 1547 */ 1548 if (record->flush_group != flg) { 1549 pip->flags |= HAMMER_INODE_REFLUSH; 1550 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1551 return(-1); 1552 } 1553 1554 /* 1555 * If in our flush group everything is already set up, 1556 * just return whether the record will improve our 1557 * visibility or not. 1558 */ 1559 if (record->type == HAMMER_MEM_RECORD_ADD) 1560 return(1); 1561 return(0); 1562 } 1563 1564 /* 1565 * It must be a setup record. Try to resolve the setup dependancies 1566 * by recursing upwards so we can place ip on the flush list. 1567 */ 1568 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1569 1570 good = hammer_setup_parent_inodes(pip, flg); 1571 1572 /* 1573 * If good < 0 the parent has no connectivity and we cannot safely 1574 * flush the directory entry, which also means we can't flush our 1575 * ip. Flag the parent and us for downward recursion once the 1576 * parent's connectivity is resolved. 1577 */ 1578 if (good < 0) { 1579 /* pip->flags |= HAMMER_INODE_CONN_DOWN; set by recursion */ 1580 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1581 return(good); 1582 } 1583 1584 /* 1585 * We are go, place the parent inode in a flushing state so we can 1586 * place its record in a flushing state. Note that the parent 1587 * may already be flushing. The record must be in the same flush 1588 * group as the parent. 1589 */ 1590 if (pip->flush_state != HAMMER_FST_FLUSH) 1591 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 1592 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 1593 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1594 1595 #if 0 1596 if (record->type == HAMMER_MEM_RECORD_DEL && 1597 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 1598 /* 1599 * Regardless of flushing state we cannot sync this path if the 1600 * record represents a delete-on-disk but the target inode 1601 * is not ready to sync its own deletion. 1602 * 1603 * XXX need to count effective nlinks to determine whether 1604 * the flush is ok, otherwise removing a hardlink will 1605 * just leave the DEL record to rot. 1606 */ 1607 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 1608 return(-1); 1609 } else 1610 #endif 1611 if (pip->flush_group == flg) { 1612 /* 1613 * Because we have not calculated nlinks yet we can just 1614 * set records to the flush state if the parent is in 1615 * the same flush group as we are. 1616 */ 1617 record->flush_state = HAMMER_FST_FLUSH; 1618 record->flush_group = flg; 1619 ++record->flush_group->refs; 1620 hammer_ref(&record->lock); 1621 1622 /* 1623 * A general directory-add contributes to our visibility. 1624 * 1625 * Otherwise it is probably a directory-delete or 1626 * delete-on-disk record and does not contribute to our 1627 * visbility (but we can still flush it). 1628 */ 1629 if (record->type == HAMMER_MEM_RECORD_ADD) 1630 return(1); 1631 return(0); 1632 } else { 1633 /* 1634 * If the parent is not in our flush group we cannot 1635 * flush this record yet, there is no visibility. 1636 * We tell the parent to reflush and mark ourselves 1637 * so the parent knows it should flush us too. 1638 */ 1639 pip->flags |= HAMMER_INODE_REFLUSH; 1640 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1641 return(-1); 1642 } 1643 } 1644 1645 /* 1646 * This is the core routine placing an inode into the FST_FLUSH state. 1647 */ 1648 static void 1649 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 1650 { 1651 int go_count; 1652 1653 /* 1654 * Set flush state and prevent the flusher from cycling into 1655 * the next flush group. Do not place the ip on the list yet. 1656 * Inodes not in the idle state get an extra reference. 1657 */ 1658 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 1659 if (ip->flush_state == HAMMER_FST_IDLE) 1660 hammer_ref(&ip->lock); 1661 ip->flush_state = HAMMER_FST_FLUSH; 1662 ip->flush_group = flg; 1663 ++ip->hmp->flusher.group_lock; 1664 ++ip->hmp->count_iqueued; 1665 ++hammer_count_iqueued; 1666 ++flg->total_count; 1667 1668 /* 1669 * If the flush group reaches the autoflush limit we want to signal 1670 * the flusher. This is particularly important for remove()s. 1671 */ 1672 if (flg->total_count == hammer_autoflush) 1673 flags |= HAMMER_FLUSH_SIGNAL; 1674 1675 /* 1676 * We need to be able to vfsync/truncate from the backend. 1677 */ 1678 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 1679 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 1680 ip->flags |= HAMMER_INODE_VHELD; 1681 vref(ip->vp); 1682 } 1683 1684 /* 1685 * Figure out how many in-memory records we can actually flush 1686 * (not including inode meta-data, buffers, etc). 1687 */ 1688 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 1689 if (flags & HAMMER_FLUSH_RECURSION) { 1690 /* 1691 * If this is a upwards recursion we do not want to 1692 * recurse down again! 1693 */ 1694 go_count = 1; 1695 #if 0 1696 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 1697 /* 1698 * No new records are added if we must complete a flush 1699 * from a previous cycle, but we do have to move the records 1700 * from the previous cycle to the current one. 1701 */ 1702 #if 0 1703 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1704 hammer_syncgrp_child_callback, NULL); 1705 #endif 1706 go_count = 1; 1707 #endif 1708 } else { 1709 /* 1710 * Normal flush, scan records and bring them into the flush. 1711 * Directory adds and deletes are usually skipped (they are 1712 * grouped with the related inode rather then with the 1713 * directory). 1714 * 1715 * go_count can be negative, which means the scan aborted 1716 * due to the flush group being over-full and we should 1717 * flush what we have. 1718 */ 1719 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1720 hammer_setup_child_callback, NULL); 1721 } 1722 1723 /* 1724 * This is a more involved test that includes go_count. If we 1725 * can't flush, flag the inode and return. If go_count is 0 we 1726 * were are unable to flush any records in our rec_tree and 1727 * must ignore the XDIRTY flag. 1728 */ 1729 if (go_count == 0) { 1730 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 1731 --ip->hmp->count_iqueued; 1732 --hammer_count_iqueued; 1733 1734 --flg->total_count; 1735 ip->flush_state = HAMMER_FST_SETUP; 1736 ip->flush_group = NULL; 1737 if (ip->flags & HAMMER_INODE_VHELD) { 1738 ip->flags &= ~HAMMER_INODE_VHELD; 1739 vrele(ip->vp); 1740 } 1741 1742 /* 1743 * REFLUSH is needed to trigger dependancy wakeups 1744 * when an inode is in SETUP. 1745 */ 1746 ip->flags |= HAMMER_INODE_REFLUSH; 1747 if (flags & HAMMER_FLUSH_SIGNAL) { 1748 ip->flags |= HAMMER_INODE_RESIGNAL; 1749 hammer_flusher_async(ip->hmp, flg); 1750 } 1751 if (--ip->hmp->flusher.group_lock == 0) 1752 wakeup(&ip->hmp->flusher.group_lock); 1753 return; 1754 } 1755 } 1756 1757 /* 1758 * Snapshot the state of the inode for the backend flusher. 1759 * 1760 * We continue to retain save_trunc_off even when all truncations 1761 * have been resolved as an optimization to determine if we can 1762 * skip the B-Tree lookup for overwrite deletions. 1763 * 1764 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 1765 * and stays in ip->flags. Once set, it stays set until the 1766 * inode is destroyed. 1767 */ 1768 if (ip->flags & HAMMER_INODE_TRUNCATED) { 1769 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 1770 ip->sync_trunc_off = ip->trunc_off; 1771 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 1772 ip->flags &= ~HAMMER_INODE_TRUNCATED; 1773 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 1774 1775 /* 1776 * The save_trunc_off used to cache whether the B-Tree 1777 * holds any records past that point is not used until 1778 * after the truncation has succeeded, so we can safely 1779 * set it now. 1780 */ 1781 if (ip->save_trunc_off > ip->sync_trunc_off) 1782 ip->save_trunc_off = ip->sync_trunc_off; 1783 } 1784 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 1785 ~HAMMER_INODE_TRUNCATED); 1786 ip->sync_ino_leaf = ip->ino_leaf; 1787 ip->sync_ino_data = ip->ino_data; 1788 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 1789 #ifdef DEBUG_TRUNCATE 1790 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp) 1791 kprintf("truncateS %016llx\n", ip->sync_trunc_off); 1792 #endif 1793 1794 /* 1795 * The flusher list inherits our inode and reference. 1796 */ 1797 KKASSERT(flg->running == 0); 1798 TAILQ_INSERT_TAIL(&flg->flush_list, ip, flush_entry); 1799 if (--ip->hmp->flusher.group_lock == 0) 1800 wakeup(&ip->hmp->flusher.group_lock); 1801 1802 if (flags & HAMMER_FLUSH_SIGNAL) { 1803 hammer_flusher_async(ip->hmp, flg); 1804 } 1805 } 1806 1807 /* 1808 * Callback for scan of ip->rec_tree. Try to include each record in our 1809 * flush. ip->flush_group has been set but the inode has not yet been 1810 * moved into a flushing state. 1811 * 1812 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 1813 * both inodes. 1814 * 1815 * We return 1 for any record placed or found in FST_FLUSH, which prevents 1816 * the caller from shortcutting the flush. 1817 */ 1818 static int 1819 hammer_setup_child_callback(hammer_record_t rec, void *data) 1820 { 1821 hammer_flush_group_t flg; 1822 hammer_inode_t target_ip; 1823 hammer_inode_t ip; 1824 int r; 1825 1826 /* 1827 * Deleted records are ignored. Note that the flush detects deleted 1828 * front-end records at multiple points to deal with races. This is 1829 * just the first line of defense. The only time DELETED_FE cannot 1830 * be set is when HAMMER_RECF_INTERLOCK_BE is set. 1831 * 1832 * Don't get confused between record deletion and, say, directory 1833 * entry deletion. The deletion of a directory entry that is on 1834 * the media has nothing to do with the record deletion flags. 1835 */ 1836 if (rec->flags & (HAMMER_RECF_DELETED_FE|HAMMER_RECF_DELETED_BE)) { 1837 if (rec->flush_state == HAMMER_FST_FLUSH) { 1838 KKASSERT(rec->flush_group == rec->ip->flush_group); 1839 r = 1; 1840 } else { 1841 r = 0; 1842 } 1843 return(r); 1844 } 1845 1846 /* 1847 * If the record is in an idle state it has no dependancies and 1848 * can be flushed. 1849 */ 1850 ip = rec->ip; 1851 flg = ip->flush_group; 1852 r = 0; 1853 1854 switch(rec->flush_state) { 1855 case HAMMER_FST_IDLE: 1856 /* 1857 * The record has no setup dependancy, we can flush it. 1858 */ 1859 KKASSERT(rec->target_ip == NULL); 1860 rec->flush_state = HAMMER_FST_FLUSH; 1861 rec->flush_group = flg; 1862 ++flg->refs; 1863 hammer_ref(&rec->lock); 1864 r = 1; 1865 break; 1866 case HAMMER_FST_SETUP: 1867 /* 1868 * The record has a setup dependancy. These are typically 1869 * directory entry adds and deletes. Such entries will be 1870 * flushed when their inodes are flushed so we do not 1871 * usually have to add them to the flush here. However, 1872 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 1873 * it is asking us to flush this record (and it). 1874 */ 1875 target_ip = rec->target_ip; 1876 KKASSERT(target_ip != NULL); 1877 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 1878 1879 /* 1880 * If the target IP is already flushing in our group 1881 * we could associate the record, but target_ip has 1882 * already synced ino_data to sync_ino_data and we 1883 * would also have to adjust nlinks. Plus there are 1884 * ordering issues for adds and deletes. 1885 * 1886 * Reflush downward if this is an ADD, and upward if 1887 * this is a DEL. 1888 */ 1889 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 1890 if (rec->flush_state == HAMMER_MEM_RECORD_ADD) 1891 ip->flags |= HAMMER_INODE_REFLUSH; 1892 else 1893 target_ip->flags |= HAMMER_INODE_REFLUSH; 1894 break; 1895 } 1896 1897 /* 1898 * Target IP is not yet flushing. This can get complex 1899 * because we have to be careful about the recursion. 1900 * 1901 * Directories create an issue for us in that if a flush 1902 * of a directory is requested the expectation is to flush 1903 * any pending directory entries, but this will cause the 1904 * related inodes to recursively flush as well. We can't 1905 * really defer the operation so just get as many as we 1906 * can and 1907 */ 1908 #if 0 1909 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 1910 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 1911 /* 1912 * We aren't reclaiming and the target ip was not 1913 * previously prevented from flushing due to this 1914 * record dependancy. Do not flush this record. 1915 */ 1916 /*r = 0;*/ 1917 } else 1918 #endif 1919 if (flg->total_count + flg->refs > 1920 ip->hmp->undo_rec_limit) { 1921 /* 1922 * Our flush group is over-full and we risk blowing 1923 * out the UNDO FIFO. Stop the scan, flush what we 1924 * have, then reflush the directory. 1925 * 1926 * The directory may be forced through multiple 1927 * flush groups before it can be completely 1928 * flushed. 1929 */ 1930 ip->flags |= HAMMER_INODE_RESIGNAL | 1931 HAMMER_INODE_REFLUSH; 1932 r = -1; 1933 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 1934 /* 1935 * If the target IP is not flushing we can force 1936 * it to flush, even if it is unable to write out 1937 * any of its own records we have at least one in 1938 * hand that we CAN deal with. 1939 */ 1940 rec->flush_state = HAMMER_FST_FLUSH; 1941 rec->flush_group = flg; 1942 ++flg->refs; 1943 hammer_ref(&rec->lock); 1944 hammer_flush_inode_core(target_ip, flg, 1945 HAMMER_FLUSH_RECURSION); 1946 r = 1; 1947 } else { 1948 /* 1949 * General or delete-on-disk record. 1950 * 1951 * XXX this needs help. If a delete-on-disk we could 1952 * disconnect the target. If the target has its own 1953 * dependancies they really need to be flushed. 1954 * 1955 * XXX 1956 */ 1957 rec->flush_state = HAMMER_FST_FLUSH; 1958 rec->flush_group = flg; 1959 ++flg->refs; 1960 hammer_ref(&rec->lock); 1961 hammer_flush_inode_core(target_ip, flg, 1962 HAMMER_FLUSH_RECURSION); 1963 r = 1; 1964 } 1965 break; 1966 case HAMMER_FST_FLUSH: 1967 /* 1968 * The flush_group should already match. 1969 */ 1970 KKASSERT(rec->flush_group == flg); 1971 r = 1; 1972 break; 1973 } 1974 return(r); 1975 } 1976 1977 #if 0 1978 /* 1979 * This version just moves records already in a flush state to the new 1980 * flush group and that is it. 1981 */ 1982 static int 1983 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 1984 { 1985 hammer_inode_t ip = rec->ip; 1986 1987 switch(rec->flush_state) { 1988 case HAMMER_FST_FLUSH: 1989 KKASSERT(rec->flush_group == ip->flush_group); 1990 break; 1991 default: 1992 break; 1993 } 1994 return(0); 1995 } 1996 #endif 1997 1998 /* 1999 * Wait for a previously queued flush to complete. 2000 * 2001 * If a critical error occured we don't try to wait. 2002 */ 2003 void 2004 hammer_wait_inode(hammer_inode_t ip) 2005 { 2006 hammer_flush_group_t flg; 2007 2008 flg = NULL; 2009 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2010 while (ip->flush_state != HAMMER_FST_IDLE && 2011 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2012 if (ip->flush_state == HAMMER_FST_SETUP) 2013 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2014 if (ip->flush_state != HAMMER_FST_IDLE) { 2015 ip->flags |= HAMMER_INODE_FLUSHW; 2016 tsleep(&ip->flags, 0, "hmrwin", 0); 2017 } 2018 } 2019 } 2020 } 2021 2022 /* 2023 * Called by the backend code when a flush has been completed. 2024 * The inode has already been removed from the flush list. 2025 * 2026 * A pipelined flush can occur, in which case we must re-enter the 2027 * inode on the list and re-copy its fields. 2028 */ 2029 void 2030 hammer_flush_inode_done(hammer_inode_t ip, int error) 2031 { 2032 hammer_mount_t hmp; 2033 int dorel; 2034 2035 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2036 2037 hmp = ip->hmp; 2038 2039 /* 2040 * Merge left-over flags back into the frontend and fix the state. 2041 * Incomplete truncations are retained by the backend. 2042 */ 2043 ip->error = error; 2044 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2045 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2046 2047 /* 2048 * The backend may have adjusted nlinks, so if the adjusted nlinks 2049 * does not match the fronttend set the frontend's RDIRTY flag again. 2050 */ 2051 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2052 ip->flags |= HAMMER_INODE_DDIRTY; 2053 2054 /* 2055 * Fix up the dirty buffer status. 2056 */ 2057 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2058 ip->flags |= HAMMER_INODE_BUFS; 2059 } 2060 2061 /* 2062 * Re-set the XDIRTY flag if some of the inode's in-memory records 2063 * could not be flushed. 2064 */ 2065 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2066 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2067 (!RB_EMPTY(&ip->rec_tree) && 2068 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2069 2070 /* 2071 * Do not lose track of inodes which no longer have vnode 2072 * assocations, otherwise they may never get flushed again. 2073 * 2074 * The reflush flag can be set superfluously, causing extra pain 2075 * for no reason. If the inode is no longer modified it no longer 2076 * needs to be flushed. 2077 */ 2078 if (ip->flags & HAMMER_INODE_MODMASK) { 2079 if (ip->vp == NULL) 2080 ip->flags |= HAMMER_INODE_REFLUSH; 2081 } else { 2082 ip->flags &= ~HAMMER_INODE_REFLUSH; 2083 } 2084 2085 /* 2086 * Adjust the flush state. 2087 */ 2088 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2089 /* 2090 * We were unable to flush out all our records, leave the 2091 * inode in a flush state and in the current flush group. 2092 * The flush group will be re-run. 2093 * 2094 * This occurs if the UNDO block gets too full or there is 2095 * too much dirty meta-data and allows the flusher to 2096 * finalize the UNDO block and then re-flush. 2097 */ 2098 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2099 dorel = 0; 2100 } else { 2101 /* 2102 * Remove from the flush_group 2103 */ 2104 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 2105 ip->flush_group = NULL; 2106 2107 /* 2108 * Clean up the vnode ref and tracking counts. 2109 */ 2110 if (ip->flags & HAMMER_INODE_VHELD) { 2111 ip->flags &= ~HAMMER_INODE_VHELD; 2112 vrele(ip->vp); 2113 } 2114 --hmp->count_iqueued; 2115 --hammer_count_iqueued; 2116 2117 /* 2118 * And adjust the state. 2119 */ 2120 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2121 ip->flush_state = HAMMER_FST_IDLE; 2122 dorel = 1; 2123 } else { 2124 ip->flush_state = HAMMER_FST_SETUP; 2125 dorel = 0; 2126 } 2127 2128 /* 2129 * If the frontend is waiting for a flush to complete, 2130 * wake it up. 2131 */ 2132 if (ip->flags & HAMMER_INODE_FLUSHW) { 2133 ip->flags &= ~HAMMER_INODE_FLUSHW; 2134 wakeup(&ip->flags); 2135 } 2136 2137 /* 2138 * If the frontend made more changes and requested another 2139 * flush, then try to get it running. 2140 * 2141 * Reflushes are aborted when the inode is errored out. 2142 */ 2143 if (ip->flags & HAMMER_INODE_REFLUSH) { 2144 ip->flags &= ~HAMMER_INODE_REFLUSH; 2145 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2146 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2147 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2148 } else { 2149 hammer_flush_inode(ip, 0); 2150 } 2151 } 2152 } 2153 2154 /* 2155 * If we have no parent dependancies we can clear CONN_DOWN 2156 */ 2157 if (TAILQ_EMPTY(&ip->target_list)) 2158 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2159 2160 /* 2161 * If the inode is now clean drop the space reservation. 2162 */ 2163 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2164 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2165 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2166 --hmp->rsv_inodes; 2167 } 2168 2169 if (dorel) 2170 hammer_rel_inode(ip, 0); 2171 } 2172 2173 /* 2174 * Called from hammer_sync_inode() to synchronize in-memory records 2175 * to the media. 2176 */ 2177 static int 2178 hammer_sync_record_callback(hammer_record_t record, void *data) 2179 { 2180 hammer_cursor_t cursor = data; 2181 hammer_transaction_t trans = cursor->trans; 2182 hammer_mount_t hmp = trans->hmp; 2183 int error; 2184 2185 /* 2186 * Skip records that do not belong to the current flush. 2187 */ 2188 ++hammer_stats_record_iterations; 2189 if (record->flush_state != HAMMER_FST_FLUSH) 2190 return(0); 2191 2192 #if 1 2193 if (record->flush_group != record->ip->flush_group) { 2194 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group); 2195 Debugger("blah2"); 2196 return(0); 2197 } 2198 #endif 2199 KKASSERT(record->flush_group == record->ip->flush_group); 2200 2201 /* 2202 * Interlock the record using the BE flag. Once BE is set the 2203 * frontend cannot change the state of FE. 2204 * 2205 * NOTE: If FE is set prior to us setting BE we still sync the 2206 * record out, but the flush completion code converts it to 2207 * a delete-on-disk record instead of destroying it. 2208 */ 2209 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2210 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2211 2212 /* 2213 * The backend may have already disposed of the record. 2214 */ 2215 if (record->flags & HAMMER_RECF_DELETED_BE) { 2216 error = 0; 2217 goto done; 2218 } 2219 2220 /* 2221 * If the whole inode is being deleting all on-disk records will 2222 * be deleted very soon, we can't sync any new records to disk 2223 * because they will be deleted in the same transaction they were 2224 * created in (delete_tid == create_tid), which will assert. 2225 * 2226 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2227 * that we currently panic on. 2228 */ 2229 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2230 switch(record->type) { 2231 case HAMMER_MEM_RECORD_DATA: 2232 /* 2233 * We don't have to do anything, if the record was 2234 * committed the space will have been accounted for 2235 * in the blockmap. 2236 */ 2237 /* fall through */ 2238 case HAMMER_MEM_RECORD_GENERAL: 2239 record->flags |= HAMMER_RECF_DELETED_FE; 2240 record->flags |= HAMMER_RECF_DELETED_BE; 2241 error = 0; 2242 goto done; 2243 case HAMMER_MEM_RECORD_ADD: 2244 panic("hammer_sync_record_callback: illegal add " 2245 "during inode deletion record %p", record); 2246 break; /* NOT REACHED */ 2247 case HAMMER_MEM_RECORD_INODE: 2248 panic("hammer_sync_record_callback: attempt to " 2249 "sync inode record %p?", record); 2250 break; /* NOT REACHED */ 2251 case HAMMER_MEM_RECORD_DEL: 2252 /* 2253 * Follow through and issue the on-disk deletion 2254 */ 2255 break; 2256 } 2257 } 2258 2259 /* 2260 * If DELETED_FE is set special handling is needed for directory 2261 * entries. Dependant pieces related to the directory entry may 2262 * have already been synced to disk. If this occurs we have to 2263 * sync the directory entry and then change the in-memory record 2264 * from an ADD to a DELETE to cover the fact that it's been 2265 * deleted by the frontend. 2266 * 2267 * A directory delete covering record (MEM_RECORD_DEL) can never 2268 * be deleted by the frontend. 2269 * 2270 * Any other record type (aka DATA) can be deleted by the frontend. 2271 * XXX At the moment the flusher must skip it because there may 2272 * be another data record in the flush group for the same block, 2273 * meaning that some frontend data changes can leak into the backend's 2274 * synchronization point. 2275 */ 2276 if (record->flags & HAMMER_RECF_DELETED_FE) { 2277 if (record->type == HAMMER_MEM_RECORD_ADD) { 2278 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2279 } else { 2280 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2281 record->flags |= HAMMER_RECF_DELETED_BE; 2282 error = 0; 2283 goto done; 2284 } 2285 } 2286 2287 /* 2288 * Assign the create_tid for new records. Deletions already 2289 * have the record's entire key properly set up. 2290 */ 2291 if (record->type != HAMMER_MEM_RECORD_DEL) 2292 record->leaf.base.create_tid = trans->tid; 2293 record->leaf.create_ts = trans->time32; 2294 for (;;) { 2295 error = hammer_ip_sync_record_cursor(cursor, record); 2296 if (error != EDEADLK) 2297 break; 2298 hammer_done_cursor(cursor); 2299 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2300 record->ip); 2301 if (error) 2302 break; 2303 } 2304 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2305 2306 if (error) 2307 error = -error; 2308 done: 2309 hammer_flush_record_done(record, error); 2310 2311 /* 2312 * Do partial finalization if we have built up too many dirty 2313 * buffers. Otherwise a buffer cache deadlock can occur when 2314 * doing things like creating tens of thousands of tiny files. 2315 * 2316 * We must release our cursor lock to avoid a 3-way deadlock 2317 * due to the exclusive sync lock the finalizer must get. 2318 */ 2319 if (hammer_flusher_meta_limit(hmp)) { 2320 hammer_unlock_cursor(cursor, 0); 2321 hammer_flusher_finalize(trans, 0); 2322 hammer_lock_cursor(cursor, 0); 2323 } 2324 2325 return(error); 2326 } 2327 2328 /* 2329 * Backend function called by the flusher to sync an inode to media. 2330 */ 2331 int 2332 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2333 { 2334 struct hammer_cursor cursor; 2335 hammer_node_t tmp_node; 2336 hammer_record_t depend; 2337 hammer_record_t next; 2338 int error, tmp_error; 2339 u_int64_t nlinks; 2340 2341 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2342 return(0); 2343 2344 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2345 if (error) 2346 goto done; 2347 2348 /* 2349 * Any directory records referencing this inode which are not in 2350 * our current flush group must adjust our nlink count for the 2351 * purposes of synchronization to disk. 2352 * 2353 * Records which are in our flush group can be unlinked from our 2354 * inode now, potentially allowing the inode to be physically 2355 * deleted. 2356 * 2357 * This cannot block. 2358 */ 2359 nlinks = ip->ino_data.nlinks; 2360 next = TAILQ_FIRST(&ip->target_list); 2361 while ((depend = next) != NULL) { 2362 next = TAILQ_NEXT(depend, target_entry); 2363 if (depend->flush_state == HAMMER_FST_FLUSH && 2364 depend->flush_group == ip->flush_group) { 2365 /* 2366 * If this is an ADD that was deleted by the frontend 2367 * the frontend nlinks count will have already been 2368 * decremented, but the backend is going to sync its 2369 * directory entry and must account for it. The 2370 * record will be converted to a delete-on-disk when 2371 * it gets synced. 2372 * 2373 * If the ADD was not deleted by the frontend we 2374 * can remove the dependancy from our target_list. 2375 */ 2376 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2377 ++nlinks; 2378 } else { 2379 TAILQ_REMOVE(&ip->target_list, depend, 2380 target_entry); 2381 depend->target_ip = NULL; 2382 } 2383 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2384 /* 2385 * Not part of our flush group 2386 */ 2387 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2388 switch(depend->type) { 2389 case HAMMER_MEM_RECORD_ADD: 2390 --nlinks; 2391 break; 2392 case HAMMER_MEM_RECORD_DEL: 2393 ++nlinks; 2394 break; 2395 default: 2396 break; 2397 } 2398 } 2399 } 2400 2401 /* 2402 * Set dirty if we had to modify the link count. 2403 */ 2404 if (ip->sync_ino_data.nlinks != nlinks) { 2405 KKASSERT((int64_t)nlinks >= 0); 2406 ip->sync_ino_data.nlinks = nlinks; 2407 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2408 } 2409 2410 /* 2411 * If there is a trunction queued destroy any data past the (aligned) 2412 * truncation point. Userland will have dealt with the buffer 2413 * containing the truncation point for us. 2414 * 2415 * We don't flush pending frontend data buffers until after we've 2416 * dealt with the truncation. 2417 */ 2418 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2419 /* 2420 * Interlock trunc_off. The VOP front-end may continue to 2421 * make adjustments to it while we are blocked. 2422 */ 2423 off_t trunc_off; 2424 off_t aligned_trunc_off; 2425 int blkmask; 2426 2427 trunc_off = ip->sync_trunc_off; 2428 blkmask = hammer_blocksize(trunc_off) - 1; 2429 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2430 2431 /* 2432 * Delete any whole blocks on-media. The front-end has 2433 * already cleaned out any partial block and made it 2434 * pending. The front-end may have updated trunc_off 2435 * while we were blocked so we only use sync_trunc_off. 2436 * 2437 * This operation can blow out the buffer cache, EWOULDBLOCK 2438 * means we were unable to complete the deletion. The 2439 * deletion will update sync_trunc_off in that case. 2440 */ 2441 error = hammer_ip_delete_range(&cursor, ip, 2442 aligned_trunc_off, 2443 0x7FFFFFFFFFFFFFFFLL, 2); 2444 if (error == EWOULDBLOCK) { 2445 ip->flags |= HAMMER_INODE_WOULDBLOCK; 2446 error = 0; 2447 goto defer_buffer_flush; 2448 } 2449 2450 if (error) 2451 goto done; 2452 2453 /* 2454 * Clear the truncation flag on the backend after we have 2455 * complete the deletions. Backend data is now good again 2456 * (including new records we are about to sync, below). 2457 * 2458 * Leave sync_trunc_off intact. As we write additional 2459 * records the backend will update sync_trunc_off. This 2460 * tells the backend whether it can skip the overwrite 2461 * test. This should work properly even when the backend 2462 * writes full blocks where the truncation point straddles 2463 * the block because the comparison is against the base 2464 * offset of the record. 2465 */ 2466 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2467 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 2468 } else { 2469 error = 0; 2470 } 2471 2472 /* 2473 * Now sync related records. These will typically be directory 2474 * entries, records tracking direct-writes, or delete-on-disk records. 2475 */ 2476 if (error == 0) { 2477 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2478 hammer_sync_record_callback, &cursor); 2479 if (tmp_error < 0) 2480 tmp_error = -error; 2481 if (tmp_error) 2482 error = tmp_error; 2483 } 2484 hammer_cache_node(&ip->cache[1], cursor.node); 2485 2486 /* 2487 * Re-seek for inode update, assuming our cache hasn't been ripped 2488 * out from under us. 2489 */ 2490 if (error == 0) { 2491 tmp_node = hammer_ref_node_safe(ip->hmp, &ip->cache[0], &error); 2492 if (tmp_node) { 2493 hammer_cursor_downgrade(&cursor); 2494 hammer_lock_sh(&tmp_node->lock); 2495 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 2496 hammer_cursor_seek(&cursor, tmp_node, 0); 2497 hammer_unlock(&tmp_node->lock); 2498 hammer_rel_node(tmp_node); 2499 } 2500 error = 0; 2501 } 2502 2503 /* 2504 * If we are deleting the inode the frontend had better not have 2505 * any active references on elements making up the inode. 2506 * 2507 * The call to hammer_ip_delete_clean() cleans up auxillary records 2508 * but not DB or DATA records. Those must have already been deleted 2509 * by the normal truncation mechanic. 2510 */ 2511 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 2512 RB_EMPTY(&ip->rec_tree) && 2513 (ip->sync_flags & HAMMER_INODE_DELETING) && 2514 (ip->flags & HAMMER_INODE_DELETED) == 0) { 2515 int count1 = 0; 2516 2517 error = hammer_ip_delete_clean(&cursor, ip, &count1); 2518 if (error == 0) { 2519 ip->flags |= HAMMER_INODE_DELETED; 2520 ip->sync_flags &= ~HAMMER_INODE_DELETING; 2521 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2522 KKASSERT(RB_EMPTY(&ip->rec_tree)); 2523 2524 /* 2525 * Set delete_tid in both the frontend and backend 2526 * copy of the inode record. The DELETED flag handles 2527 * this, do not set RDIRTY. 2528 */ 2529 ip->ino_leaf.base.delete_tid = trans->tid; 2530 ip->sync_ino_leaf.base.delete_tid = trans->tid; 2531 ip->ino_leaf.delete_ts = trans->time32; 2532 ip->sync_ino_leaf.delete_ts = trans->time32; 2533 2534 2535 /* 2536 * Adjust the inode count in the volume header 2537 */ 2538 hammer_sync_lock_sh(trans); 2539 if (ip->flags & HAMMER_INODE_ONDISK) { 2540 hammer_modify_volume_field(trans, 2541 trans->rootvol, 2542 vol0_stat_inodes); 2543 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 2544 hammer_modify_volume_done(trans->rootvol); 2545 } 2546 hammer_sync_unlock(trans); 2547 } 2548 } 2549 2550 if (error) 2551 goto done; 2552 ip->sync_flags &= ~HAMMER_INODE_BUFS; 2553 2554 defer_buffer_flush: 2555 /* 2556 * Now update the inode's on-disk inode-data and/or on-disk record. 2557 * DELETED and ONDISK are managed only in ip->flags. 2558 * 2559 * In the case of a defered buffer flush we still update the on-disk 2560 * inode to satisfy visibility requirements if there happen to be 2561 * directory dependancies. 2562 */ 2563 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 2564 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 2565 /* 2566 * If deleted and on-disk, don't set any additional flags. 2567 * the delete flag takes care of things. 2568 * 2569 * Clear flags which may have been set by the frontend. 2570 */ 2571 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2572 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2573 HAMMER_INODE_DELETING); 2574 break; 2575 case HAMMER_INODE_DELETED: 2576 /* 2577 * Take care of the case where a deleted inode was never 2578 * flushed to the disk in the first place. 2579 * 2580 * Clear flags which may have been set by the frontend. 2581 */ 2582 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2583 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2584 HAMMER_INODE_DELETING); 2585 while (RB_ROOT(&ip->rec_tree)) { 2586 hammer_record_t record = RB_ROOT(&ip->rec_tree); 2587 hammer_ref(&record->lock); 2588 KKASSERT(record->lock.refs == 1); 2589 record->flags |= HAMMER_RECF_DELETED_FE; 2590 record->flags |= HAMMER_RECF_DELETED_BE; 2591 hammer_rel_mem_record(record); 2592 } 2593 break; 2594 case HAMMER_INODE_ONDISK: 2595 /* 2596 * If already on-disk, do not set any additional flags. 2597 */ 2598 break; 2599 default: 2600 /* 2601 * If not on-disk and not deleted, set DDIRTY to force 2602 * an initial record to be written. 2603 * 2604 * Also set the create_tid in both the frontend and backend 2605 * copy of the inode record. 2606 */ 2607 ip->ino_leaf.base.create_tid = trans->tid; 2608 ip->ino_leaf.create_ts = trans->time32; 2609 ip->sync_ino_leaf.base.create_tid = trans->tid; 2610 ip->sync_ino_leaf.create_ts = trans->time32; 2611 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2612 break; 2613 } 2614 2615 /* 2616 * If RDIRTY or DDIRTY is set, write out a new record. If the inode 2617 * is already on-disk the old record is marked as deleted. 2618 * 2619 * If DELETED is set hammer_update_inode() will delete the existing 2620 * record without writing out a new one. 2621 * 2622 * If *ONLY* the ITIMES flag is set we can update the record in-place. 2623 */ 2624 if (ip->flags & HAMMER_INODE_DELETED) { 2625 error = hammer_update_inode(&cursor, ip); 2626 } else 2627 if ((ip->sync_flags & HAMMER_INODE_DDIRTY) == 0 && 2628 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 2629 error = hammer_update_itimes(&cursor, ip); 2630 } else 2631 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 2632 error = hammer_update_inode(&cursor, ip); 2633 } 2634 done: 2635 if (error) { 2636 hammer_critical_error(ip->hmp, ip, error, 2637 "while syncing inode"); 2638 } 2639 hammer_done_cursor(&cursor); 2640 return(error); 2641 } 2642 2643 /* 2644 * This routine is called when the OS is no longer actively referencing 2645 * the inode (but might still be keeping it cached), or when releasing 2646 * the last reference to an inode. 2647 * 2648 * At this point if the inode's nlinks count is zero we want to destroy 2649 * it, which may mean destroying it on-media too. 2650 */ 2651 void 2652 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 2653 { 2654 struct vnode *vp; 2655 2656 /* 2657 * Set the DELETING flag when the link count drops to 0 and the 2658 * OS no longer has any opens on the inode. 2659 * 2660 * The backend will clear DELETING (a mod flag) and set DELETED 2661 * (a state flag) when it is actually able to perform the 2662 * operation. 2663 * 2664 * Don't reflag the deletion if the flusher is currently syncing 2665 * one that was already flagged. A previously set DELETING flag 2666 * may bounce around flags and sync_flags until the operation is 2667 * completely done. 2668 */ 2669 if (ip->ino_data.nlinks == 0 && 2670 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 2671 ip->flags |= HAMMER_INODE_DELETING; 2672 ip->flags |= HAMMER_INODE_TRUNCATED; 2673 ip->trunc_off = 0; 2674 vp = NULL; 2675 if (getvp) { 2676 if (hammer_get_vnode(ip, &vp) != 0) 2677 return; 2678 } 2679 2680 /* 2681 * Final cleanup 2682 */ 2683 if (ip->vp) { 2684 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); 2685 vnode_pager_setsize(ip->vp, 0); 2686 } 2687 if (getvp) { 2688 vput(vp); 2689 } 2690 } 2691 } 2692 2693 /* 2694 * After potentially resolving a dependancy the inode is tested 2695 * to determine whether it needs to be reflushed. 2696 */ 2697 void 2698 hammer_test_inode(hammer_inode_t ip) 2699 { 2700 if (ip->flags & HAMMER_INODE_REFLUSH) { 2701 ip->flags &= ~HAMMER_INODE_REFLUSH; 2702 hammer_ref(&ip->lock); 2703 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2704 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2705 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2706 } else { 2707 hammer_flush_inode(ip, 0); 2708 } 2709 hammer_rel_inode(ip, 0); 2710 } 2711 } 2712 2713 /* 2714 * Clear the RECLAIM flag on an inode. This occurs when the inode is 2715 * reassociated with a vp or just before it gets freed. 2716 * 2717 * Wakeup one thread blocked waiting on reclaims to complete. Note that 2718 * the inode the thread is waiting on behalf of is a different inode then 2719 * the inode we are called with. This is to create a pipeline. 2720 */ 2721 static void 2722 hammer_inode_wakereclaims(hammer_inode_t ip) 2723 { 2724 struct hammer_reclaim *reclaim; 2725 hammer_mount_t hmp = ip->hmp; 2726 2727 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 2728 return; 2729 2730 --hammer_count_reclaiming; 2731 --hmp->inode_reclaims; 2732 ip->flags &= ~HAMMER_INODE_RECLAIM; 2733 2734 if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) { 2735 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 2736 reclaim->okydoky = 1; 2737 wakeup(reclaim); 2738 } 2739 } 2740 2741 /* 2742 * Setup our reclaim pipeline. We only let so many detached (and dirty) 2743 * inodes build up before we start blocking. 2744 * 2745 * When we block we don't care *which* inode has finished reclaiming, 2746 * as lone as one does. This is somewhat heuristical... we also put a 2747 * cap on how long we are willing to wait. 2748 */ 2749 void 2750 hammer_inode_waitreclaims(hammer_mount_t hmp) 2751 { 2752 struct hammer_reclaim reclaim; 2753 int delay; 2754 2755 if (hmp->inode_reclaims > HAMMER_RECLAIM_WAIT) { 2756 reclaim.okydoky = 0; 2757 TAILQ_INSERT_TAIL(&hmp->reclaim_list, 2758 &reclaim, entry); 2759 } else { 2760 reclaim.okydoky = 1; 2761 } 2762 2763 if (reclaim.okydoky == 0) { 2764 delay = (hmp->inode_reclaims - HAMMER_RECLAIM_WAIT) * hz / 2765 (HAMMER_RECLAIM_WAIT * 5); 2766 if (delay >= 0) 2767 tsleep(&reclaim, 0, "hmrrcm", delay + 1); 2768 if (reclaim.okydoky == 0) 2769 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 2770 } 2771 } 2772 2773