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, int dowake); 55 56 #ifdef DEBUG_TRUNCATE 57 extern struct hammer_inode *HammerTruncIp; 58 #endif 59 60 /* 61 * RB-Tree support for inode structures 62 */ 63 int 64 hammer_ino_rb_compare(hammer_inode_t ip1, hammer_inode_t ip2) 65 { 66 if (ip1->obj_localization < ip2->obj_localization) 67 return(-1); 68 if (ip1->obj_localization > ip2->obj_localization) 69 return(1); 70 if (ip1->obj_id < ip2->obj_id) 71 return(-1); 72 if (ip1->obj_id > ip2->obj_id) 73 return(1); 74 if (ip1->obj_asof < ip2->obj_asof) 75 return(-1); 76 if (ip1->obj_asof > ip2->obj_asof) 77 return(1); 78 return(0); 79 } 80 81 /* 82 * RB-Tree support for inode structures / special LOOKUP_INFO 83 */ 84 static int 85 hammer_inode_info_cmp(hammer_inode_info_t info, hammer_inode_t ip) 86 { 87 if (info->obj_localization < ip->obj_localization) 88 return(-1); 89 if (info->obj_localization > ip->obj_localization) 90 return(1); 91 if (info->obj_id < ip->obj_id) 92 return(-1); 93 if (info->obj_id > ip->obj_id) 94 return(1); 95 if (info->obj_asof < ip->obj_asof) 96 return(-1); 97 if (info->obj_asof > ip->obj_asof) 98 return(1); 99 return(0); 100 } 101 102 /* 103 * Used by hammer_scan_inode_snapshots() to locate all of an object's 104 * snapshots. Note that the asof field is not tested, which we can get 105 * away with because it is the lowest-priority field. 106 */ 107 static int 108 hammer_inode_info_cmp_all_history(hammer_inode_t ip, void *data) 109 { 110 hammer_inode_info_t info = data; 111 112 if (ip->obj_localization > info->obj_localization) 113 return(1); 114 if (ip->obj_localization < info->obj_localization) 115 return(-1); 116 if (ip->obj_id > info->obj_id) 117 return(1); 118 if (ip->obj_id < info->obj_id) 119 return(-1); 120 return(0); 121 } 122 123 /* 124 * Used by hammer_unload_pseudofs() to locate all inodes associated with 125 * a particular PFS. 126 */ 127 static int 128 hammer_inode_pfs_cmp(hammer_inode_t ip, void *data) 129 { 130 u_int32_t localization = *(u_int32_t *)data; 131 if (ip->obj_localization > localization) 132 return(1); 133 if (ip->obj_localization < localization) 134 return(-1); 135 return(0); 136 } 137 138 /* 139 * RB-Tree support for pseudofs structures 140 */ 141 static int 142 hammer_pfs_rb_compare(hammer_pseudofs_inmem_t p1, hammer_pseudofs_inmem_t p2) 143 { 144 if (p1->localization < p2->localization) 145 return(-1); 146 if (p1->localization > p2->localization) 147 return(1); 148 return(0); 149 } 150 151 152 RB_GENERATE(hammer_ino_rb_tree, hammer_inode, rb_node, hammer_ino_rb_compare); 153 RB_GENERATE_XLOOKUP(hammer_ino_rb_tree, INFO, hammer_inode, rb_node, 154 hammer_inode_info_cmp, hammer_inode_info_t); 155 RB_GENERATE2(hammer_pfs_rb_tree, hammer_pseudofs_inmem, rb_node, 156 hammer_pfs_rb_compare, u_int32_t, localization); 157 158 /* 159 * The kernel is not actively referencing this vnode but is still holding 160 * it cached. 161 * 162 * This is called from the frontend. 163 */ 164 int 165 hammer_vop_inactive(struct vop_inactive_args *ap) 166 { 167 struct hammer_inode *ip = VTOI(ap->a_vp); 168 169 /* 170 * Degenerate case 171 */ 172 if (ip == NULL) { 173 vrecycle(ap->a_vp); 174 return(0); 175 } 176 177 /* 178 * If the inode no longer has visibility in the filesystem try to 179 * recycle it immediately, even if the inode is dirty. Recycling 180 * it quickly allows the system to reclaim buffer cache and VM 181 * resources which can matter a lot in a heavily loaded system. 182 * 183 * This can deadlock in vfsync() if we aren't careful. 184 * 185 * Do not queue the inode to the flusher if we still have visibility, 186 * otherwise namespace calls such as chmod will unnecessarily generate 187 * multiple inode updates. 188 */ 189 hammer_inode_unloadable_check(ip, 0); 190 if (ip->ino_data.nlinks == 0) { 191 if (ip->flags & HAMMER_INODE_MODMASK) 192 hammer_flush_inode(ip, 0); 193 vrecycle(ap->a_vp); 194 } 195 return(0); 196 } 197 198 /* 199 * Release the vnode association. This is typically (but not always) 200 * the last reference on the inode. 201 * 202 * Once the association is lost we are on our own with regards to 203 * flushing the inode. 204 */ 205 int 206 hammer_vop_reclaim(struct vop_reclaim_args *ap) 207 { 208 struct hammer_inode *ip; 209 hammer_mount_t hmp; 210 struct vnode *vp; 211 212 vp = ap->a_vp; 213 214 if ((ip = vp->v_data) != NULL) { 215 hmp = ip->hmp; 216 vp->v_data = NULL; 217 ip->vp = NULL; 218 219 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { 220 ++hammer_count_reclaiming; 221 ++hmp->inode_reclaims; 222 ip->flags |= HAMMER_INODE_RECLAIM; 223 } 224 hammer_rel_inode(ip, 1); 225 } 226 return(0); 227 } 228 229 /* 230 * Return a locked vnode for the specified inode. The inode must be 231 * referenced but NOT LOCKED on entry and will remain referenced on 232 * return. 233 * 234 * Called from the frontend. 235 */ 236 int 237 hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) 238 { 239 hammer_mount_t hmp; 240 struct vnode *vp; 241 int error = 0; 242 u_int8_t obj_type; 243 244 hmp = ip->hmp; 245 246 for (;;) { 247 if ((vp = ip->vp) == NULL) { 248 error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); 249 if (error) 250 break; 251 hammer_lock_ex(&ip->lock); 252 if (ip->vp != NULL) { 253 hammer_unlock(&ip->lock); 254 vp->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, 0); 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 * If we find an inode with no vnode we have to mark the 363 * transaction such that hammer_inode_waitreclaims() is 364 * called later on to avoid building up an infinite number 365 * of inodes. Otherwise we can continue to * add new inodes 366 * faster then they can be disposed of, even with the tsleep 367 * delay. 368 */ 369 iinfo.obj_id = obj_id; 370 iinfo.obj_asof = asof; 371 iinfo.obj_localization = localization; 372 loop: 373 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); 374 if (ip) { 375 #if 0 376 if (ip->vp == NULL) 377 trans->flags |= HAMMER_TRANSF_NEWINODE; 378 #endif 379 hammer_ref(&ip->lock); 380 *errorp = 0; 381 return(ip); 382 } 383 384 /* 385 * Allocate a new inode structure and deal with races later. 386 */ 387 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 388 ++hammer_count_inodes; 389 ++hmp->count_inodes; 390 ip->obj_id = obj_id; 391 ip->obj_asof = iinfo.obj_asof; 392 ip->obj_localization = localization; 393 ip->hmp = hmp; 394 ip->flags = flags & HAMMER_INODE_RO; 395 ip->cache[0].ip = ip; 396 ip->cache[1].ip = ip; 397 if (hmp->ronly) 398 ip->flags |= HAMMER_INODE_RO; 399 ip->sync_trunc_off = ip->trunc_off = ip->save_trunc_off = 400 0x7FFFFFFFFFFFFFFFLL; 401 RB_INIT(&ip->rec_tree); 402 TAILQ_INIT(&ip->target_list); 403 hammer_ref(&ip->lock); 404 405 /* 406 * Locate the on-disk inode. If this is a PFS root we always 407 * access the current version of the root inode and (if it is not 408 * a master) always access information under it with a snapshot 409 * TID. 410 */ 411 retry: 412 hammer_init_cursor(trans, &cursor, (dip ? &dip->cache[0] : NULL), NULL); 413 cursor.key_beg.localization = localization + HAMMER_LOCALIZE_INODE; 414 cursor.key_beg.obj_id = ip->obj_id; 415 cursor.key_beg.key = 0; 416 cursor.key_beg.create_tid = 0; 417 cursor.key_beg.delete_tid = 0; 418 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; 419 cursor.key_beg.obj_type = 0; 420 421 cursor.asof = iinfo.obj_asof; 422 cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | 423 HAMMER_CURSOR_ASOF; 424 425 *errorp = hammer_btree_lookup(&cursor); 426 if (*errorp == EDEADLK) { 427 hammer_done_cursor(&cursor); 428 goto retry; 429 } 430 431 /* 432 * On success the B-Tree lookup will hold the appropriate 433 * buffer cache buffers and provide a pointer to the requested 434 * information. Copy the information to the in-memory inode 435 * and cache the B-Tree node to improve future operations. 436 */ 437 if (*errorp == 0) { 438 ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; 439 ip->ino_data = cursor.data->inode; 440 441 /* 442 * cache[0] tries to cache the location of the object inode. 443 * The assumption is that it is near the directory inode. 444 * 445 * cache[1] tries to cache the location of the object data. 446 * The assumption is that it is near the directory data. 447 */ 448 hammer_cache_node(&ip->cache[0], cursor.node); 449 if (dip && dip->cache[1].node) 450 hammer_cache_node(&ip->cache[1], dip->cache[1].node); 451 452 /* 453 * The file should not contain any data past the file size 454 * stored in the inode. Setting save_trunc_off to the 455 * file size instead of max reduces B-Tree lookup overheads 456 * on append by allowing the flusher to avoid checking for 457 * record overwrites. 458 */ 459 ip->save_trunc_off = ip->ino_data.size; 460 461 /* 462 * Locate and assign the pseudofs management structure to 463 * the inode. 464 */ 465 if (dip && dip->obj_localization == ip->obj_localization) { 466 ip->pfsm = dip->pfsm; 467 hammer_ref(&ip->pfsm->lock); 468 } else { 469 ip->pfsm = hammer_load_pseudofs(trans, 470 ip->obj_localization, 471 errorp); 472 *errorp = 0; /* ignore ENOENT */ 473 } 474 } 475 476 /* 477 * The inode is placed on the red-black tree and will be synced to 478 * the media when flushed or by the filesystem sync. If this races 479 * another instantiation/lookup the insertion will fail. 480 */ 481 if (*errorp == 0) { 482 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 483 hammer_free_inode(ip); 484 hammer_done_cursor(&cursor); 485 goto loop; 486 } 487 ip->flags |= HAMMER_INODE_ONDISK; 488 } else { 489 if (ip->flags & HAMMER_INODE_RSV_INODES) { 490 ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ 491 --hmp->rsv_inodes; 492 } 493 494 hammer_free_inode(ip); 495 ip = NULL; 496 } 497 hammer_done_cursor(&cursor); 498 trans->flags |= HAMMER_TRANSF_NEWINODE; 499 return (ip); 500 } 501 502 /* 503 * Create a new filesystem object, returning the inode in *ipp. The 504 * returned inode will be referenced. The inode is created in-memory. 505 * 506 * If pfsm is non-NULL the caller wishes to create the root inode for 507 * a master PFS. 508 */ 509 int 510 hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, 511 struct ucred *cred, hammer_inode_t dip, 512 hammer_pseudofs_inmem_t pfsm, struct hammer_inode **ipp) 513 { 514 hammer_mount_t hmp; 515 hammer_inode_t ip; 516 uid_t xuid; 517 int error; 518 519 hmp = trans->hmp; 520 521 ip = kmalloc(sizeof(*ip), hmp->m_inodes, M_WAITOK|M_ZERO); 522 ++hammer_count_inodes; 523 ++hmp->count_inodes; 524 trans->flags |= HAMMER_TRANSF_NEWINODE; 525 526 if (pfsm) { 527 KKASSERT(pfsm->localization != 0); 528 ip->obj_id = HAMMER_OBJID_ROOT; 529 ip->obj_localization = pfsm->localization; 530 } else { 531 KKASSERT(dip != NULL); 532 ip->obj_id = hammer_alloc_objid(hmp, dip); 533 ip->obj_localization = dip->obj_localization; 534 } 535 536 KKASSERT(ip->obj_id != 0); 537 ip->obj_asof = hmp->asof; 538 ip->hmp = hmp; 539 ip->flush_state = HAMMER_FST_IDLE; 540 ip->flags = HAMMER_INODE_DDIRTY | 541 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME; 542 ip->cache[0].ip = ip; 543 ip->cache[1].ip = ip; 544 545 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 546 /* ip->save_trunc_off = 0; (already zero) */ 547 RB_INIT(&ip->rec_tree); 548 TAILQ_INIT(&ip->target_list); 549 550 ip->ino_data.atime = trans->time; 551 ip->ino_data.mtime = trans->time; 552 ip->ino_data.size = 0; 553 ip->ino_data.nlinks = 0; 554 555 /* 556 * A nohistory designator on the parent directory is inherited by 557 * the child. We will do this even for pseudo-fs creation... the 558 * sysad can turn it off. 559 */ 560 if (dip) { 561 ip->ino_data.uflags = dip->ino_data.uflags & 562 (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); 563 } 564 565 ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; 566 ip->ino_leaf.base.localization = ip->obj_localization + 567 HAMMER_LOCALIZE_INODE; 568 ip->ino_leaf.base.obj_id = ip->obj_id; 569 ip->ino_leaf.base.key = 0; 570 ip->ino_leaf.base.create_tid = 0; 571 ip->ino_leaf.base.delete_tid = 0; 572 ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; 573 ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); 574 575 ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; 576 ip->ino_data.version = HAMMER_INODE_DATA_VERSION; 577 ip->ino_data.mode = vap->va_mode; 578 ip->ino_data.ctime = trans->time; 579 580 /* 581 * If we are running version 2 or greater we use dirhash algorithm #1 582 * which is semi-sorted. Algorithm #0 was just a pure crc. 583 */ 584 if (trans->hmp->version >= HAMMER_VOL_VERSION_TWO) { 585 if (ip->ino_leaf.base.obj_type == HAMMER_OBJTYPE_DIRECTORY) { 586 ip->ino_data.cap_flags |= HAMMER_INODE_CAP_DIRHASH_ALG1; 587 } 588 } 589 590 /* 591 * Setup the ".." pointer. This only needs to be done for directories 592 * but we do it for all objects as a recovery aid. 593 */ 594 if (dip) 595 ip->ino_data.parent_obj_id = dip->ino_leaf.base.obj_id; 596 #if 0 597 /* 598 * The parent_obj_localization field only applies to pseudo-fs roots. 599 * XXX this is no longer applicable, PFSs are no longer directly 600 * tied into the parent's directory structure. 601 */ 602 if (ip->ino_data.obj_type == HAMMER_OBJTYPE_DIRECTORY && 603 ip->obj_id == HAMMER_OBJID_ROOT) { 604 ip->ino_data.ext.obj.parent_obj_localization = 605 dip->obj_localization; 606 } 607 #endif 608 609 switch(ip->ino_leaf.base.obj_type) { 610 case HAMMER_OBJTYPE_CDEV: 611 case HAMMER_OBJTYPE_BDEV: 612 ip->ino_data.rmajor = vap->va_rmajor; 613 ip->ino_data.rminor = vap->va_rminor; 614 break; 615 default: 616 break; 617 } 618 619 /* 620 * Calculate default uid/gid and overwrite with information from 621 * the vap. 622 */ 623 if (dip) { 624 xuid = hammer_to_unix_xid(&dip->ino_data.uid); 625 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, 626 xuid, cred, &vap->va_mode); 627 } else { 628 xuid = 0; 629 } 630 ip->ino_data.mode = vap->va_mode; 631 632 if (vap->va_vaflags & VA_UID_UUID_VALID) 633 ip->ino_data.uid = vap->va_uid_uuid; 634 else if (vap->va_uid != (uid_t)VNOVAL) 635 hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); 636 else 637 hammer_guid_to_uuid(&ip->ino_data.uid, xuid); 638 639 if (vap->va_vaflags & VA_GID_UUID_VALID) 640 ip->ino_data.gid = vap->va_gid_uuid; 641 else if (vap->va_gid != (gid_t)VNOVAL) 642 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); 643 else if (dip) 644 ip->ino_data.gid = dip->ino_data.gid; 645 646 hammer_ref(&ip->lock); 647 648 if (pfsm) { 649 ip->pfsm = pfsm; 650 hammer_ref(&pfsm->lock); 651 error = 0; 652 } else if (dip->obj_localization == ip->obj_localization) { 653 ip->pfsm = dip->pfsm; 654 hammer_ref(&ip->pfsm->lock); 655 error = 0; 656 } else { 657 ip->pfsm = hammer_load_pseudofs(trans, 658 ip->obj_localization, 659 &error); 660 error = 0; /* ignore ENOENT */ 661 } 662 663 if (error) { 664 hammer_free_inode(ip); 665 ip = NULL; 666 } else if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { 667 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id); 668 /* not reached */ 669 hammer_free_inode(ip); 670 } 671 *ipp = ip; 672 return(error); 673 } 674 675 /* 676 * Final cleanup / freeing of an inode structure 677 */ 678 static void 679 hammer_free_inode(hammer_inode_t ip) 680 { 681 struct hammer_mount *hmp; 682 683 hmp = ip->hmp; 684 KKASSERT(ip->lock.refs == 1); 685 hammer_uncache_node(&ip->cache[0]); 686 hammer_uncache_node(&ip->cache[1]); 687 hammer_inode_wakereclaims(ip, 1); 688 if (ip->objid_cache) 689 hammer_clear_objid(ip); 690 --hammer_count_inodes; 691 --hmp->count_inodes; 692 if (ip->pfsm) { 693 hammer_rel_pseudofs(hmp, ip->pfsm); 694 ip->pfsm = NULL; 695 } 696 kfree(ip, hmp->m_inodes); 697 ip = NULL; 698 } 699 700 /* 701 * Retrieve pseudo-fs data. NULL will never be returned. 702 * 703 * If an error occurs *errorp will be set and a default template is returned, 704 * otherwise *errorp is set to 0. Typically when an error occurs it will 705 * be ENOENT. 706 */ 707 hammer_pseudofs_inmem_t 708 hammer_load_pseudofs(hammer_transaction_t trans, 709 u_int32_t localization, int *errorp) 710 { 711 hammer_mount_t hmp = trans->hmp; 712 hammer_inode_t ip; 713 hammer_pseudofs_inmem_t pfsm; 714 struct hammer_cursor cursor; 715 int bytes; 716 717 retry: 718 pfsm = RB_LOOKUP(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, localization); 719 if (pfsm) { 720 hammer_ref(&pfsm->lock); 721 *errorp = 0; 722 return(pfsm); 723 } 724 725 /* 726 * PFS records are stored in the root inode (not the PFS root inode, 727 * but the real root). Avoid an infinite recursion if loading 728 * the PFS for the real root. 729 */ 730 if (localization) { 731 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, 732 HAMMER_MAX_TID, 733 HAMMER_DEF_LOCALIZATION, 0, errorp); 734 } else { 735 ip = NULL; 736 } 737 738 pfsm = kmalloc(sizeof(*pfsm), hmp->m_misc, M_WAITOK | M_ZERO); 739 pfsm->localization = localization; 740 pfsm->pfsd.unique_uuid = trans->rootvol->ondisk->vol_fsid; 741 pfsm->pfsd.shared_uuid = pfsm->pfsd.unique_uuid; 742 743 hammer_init_cursor(trans, &cursor, (ip ? &ip->cache[1] : NULL), ip); 744 cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION + 745 HAMMER_LOCALIZE_MISC; 746 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 747 cursor.key_beg.create_tid = 0; 748 cursor.key_beg.delete_tid = 0; 749 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 750 cursor.key_beg.obj_type = 0; 751 cursor.key_beg.key = localization; 752 cursor.asof = HAMMER_MAX_TID; 753 cursor.flags |= HAMMER_CURSOR_ASOF; 754 755 if (ip) 756 *errorp = hammer_ip_lookup(&cursor); 757 else 758 *errorp = hammer_btree_lookup(&cursor); 759 if (*errorp == 0) { 760 *errorp = hammer_ip_resolve_data(&cursor); 761 if (*errorp == 0) { 762 if (cursor.data->pfsd.mirror_flags & 763 HAMMER_PFSD_DELETED) { 764 *errorp = ENOENT; 765 } else { 766 bytes = cursor.leaf->data_len; 767 if (bytes > sizeof(pfsm->pfsd)) 768 bytes = sizeof(pfsm->pfsd); 769 bcopy(cursor.data, &pfsm->pfsd, bytes); 770 } 771 } 772 } 773 hammer_done_cursor(&cursor); 774 775 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 776 hammer_ref(&pfsm->lock); 777 if (ip) 778 hammer_rel_inode(ip, 0); 779 if (RB_INSERT(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm)) { 780 kfree(pfsm, hmp->m_misc); 781 goto retry; 782 } 783 return(pfsm); 784 } 785 786 /* 787 * Store pseudo-fs data. The backend will automatically delete any prior 788 * on-disk pseudo-fs data but we have to delete in-memory versions. 789 */ 790 int 791 hammer_save_pseudofs(hammer_transaction_t trans, hammer_pseudofs_inmem_t pfsm) 792 { 793 struct hammer_cursor cursor; 794 hammer_record_t record; 795 hammer_inode_t ip; 796 int error; 797 798 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 799 HAMMER_DEF_LOCALIZATION, 0, &error); 800 retry: 801 pfsm->fsid_udev = hammer_fsid_to_udev(&pfsm->pfsd.shared_uuid); 802 hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 803 cursor.key_beg.localization = ip->obj_localization + 804 HAMMER_LOCALIZE_MISC; 805 cursor.key_beg.obj_id = HAMMER_OBJID_ROOT; 806 cursor.key_beg.create_tid = 0; 807 cursor.key_beg.delete_tid = 0; 808 cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS; 809 cursor.key_beg.obj_type = 0; 810 cursor.key_beg.key = pfsm->localization; 811 cursor.asof = HAMMER_MAX_TID; 812 cursor.flags |= HAMMER_CURSOR_ASOF; 813 814 error = hammer_ip_lookup(&cursor); 815 if (error == 0 && hammer_cursor_inmem(&cursor)) { 816 record = cursor.iprec; 817 if (record->flags & HAMMER_RECF_INTERLOCK_BE) { 818 KKASSERT(cursor.deadlk_rec == NULL); 819 hammer_ref(&record->lock); 820 cursor.deadlk_rec = record; 821 error = EDEADLK; 822 } else { 823 record->flags |= HAMMER_RECF_DELETED_FE; 824 error = 0; 825 } 826 } 827 if (error == 0 || error == ENOENT) { 828 record = hammer_alloc_mem_record(ip, sizeof(pfsm->pfsd)); 829 record->type = HAMMER_MEM_RECORD_GENERAL; 830 831 record->leaf.base.localization = ip->obj_localization + 832 HAMMER_LOCALIZE_MISC; 833 record->leaf.base.rec_type = HAMMER_RECTYPE_PFS; 834 record->leaf.base.key = pfsm->localization; 835 record->leaf.data_len = sizeof(pfsm->pfsd); 836 bcopy(&pfsm->pfsd, record->data, sizeof(pfsm->pfsd)); 837 error = hammer_ip_add_record(trans, record); 838 } 839 hammer_done_cursor(&cursor); 840 if (error == EDEADLK) 841 goto retry; 842 hammer_rel_inode(ip, 0); 843 return(error); 844 } 845 846 /* 847 * Create a root directory for a PFS if one does not alredy exist. 848 * 849 * The PFS root stands alone so we must also bump the nlinks count 850 * to prevent it from being destroyed on release. 851 */ 852 int 853 hammer_mkroot_pseudofs(hammer_transaction_t trans, struct ucred *cred, 854 hammer_pseudofs_inmem_t pfsm) 855 { 856 hammer_inode_t ip; 857 struct vattr vap; 858 int error; 859 860 ip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID, 861 pfsm->localization, 0, &error); 862 if (ip == NULL) { 863 vattr_null(&vap); 864 vap.va_mode = 0755; 865 vap.va_type = VDIR; 866 error = hammer_create_inode(trans, &vap, cred, NULL, pfsm, &ip); 867 if (error == 0) { 868 ++ip->ino_data.nlinks; 869 hammer_modify_inode(ip, HAMMER_INODE_DDIRTY); 870 } 871 } 872 if (ip) 873 hammer_rel_inode(ip, 0); 874 return(error); 875 } 876 877 /* 878 * Unload any vnodes & inodes associated with a PFS, return ENOTEMPTY 879 * if we are unable to disassociate all the inodes. 880 */ 881 static 882 int 883 hammer_unload_pseudofs_callback(hammer_inode_t ip, void *data) 884 { 885 int res; 886 887 hammer_ref(&ip->lock); 888 if (ip->lock.refs == 2 && ip->vp) 889 vclean_unlocked(ip->vp); 890 if (ip->lock.refs == 1 && ip->vp == NULL) 891 res = 0; 892 else 893 res = -1; /* stop, someone is using the inode */ 894 hammer_rel_inode(ip, 0); 895 return(res); 896 } 897 898 int 899 hammer_unload_pseudofs(hammer_transaction_t trans, u_int32_t localization) 900 { 901 int res; 902 int try; 903 904 for (try = res = 0; try < 4; ++try) { 905 res = hammer_ino_rb_tree_RB_SCAN(&trans->hmp->rb_inos_root, 906 hammer_inode_pfs_cmp, 907 hammer_unload_pseudofs_callback, 908 &localization); 909 if (res == 0 && try > 1) 910 break; 911 hammer_flusher_sync(trans->hmp); 912 } 913 if (res != 0) 914 res = ENOTEMPTY; 915 return(res); 916 } 917 918 919 /* 920 * Release a reference on a PFS 921 */ 922 void 923 hammer_rel_pseudofs(hammer_mount_t hmp, hammer_pseudofs_inmem_t pfsm) 924 { 925 hammer_unref(&pfsm->lock); 926 if (pfsm->lock.refs == 0) { 927 RB_REMOVE(hammer_pfs_rb_tree, &hmp->rb_pfsm_root, pfsm); 928 kfree(pfsm, hmp->m_misc); 929 } 930 } 931 932 /* 933 * Called by hammer_sync_inode(). 934 */ 935 static int 936 hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) 937 { 938 hammer_transaction_t trans = cursor->trans; 939 hammer_record_t record; 940 int error; 941 int redirty; 942 943 retry: 944 error = 0; 945 946 /* 947 * If the inode has a presence on-disk then locate it and mark 948 * it deleted, setting DELONDISK. 949 * 950 * The record may or may not be physically deleted, depending on 951 * the retention policy. 952 */ 953 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == 954 HAMMER_INODE_ONDISK) { 955 hammer_normalize_cursor(cursor); 956 cursor->key_beg.localization = ip->obj_localization + 957 HAMMER_LOCALIZE_INODE; 958 cursor->key_beg.obj_id = ip->obj_id; 959 cursor->key_beg.key = 0; 960 cursor->key_beg.create_tid = 0; 961 cursor->key_beg.delete_tid = 0; 962 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 963 cursor->key_beg.obj_type = 0; 964 cursor->asof = ip->obj_asof; 965 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 966 cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; 967 cursor->flags |= HAMMER_CURSOR_BACKEND; 968 969 error = hammer_btree_lookup(cursor); 970 if (hammer_debug_inode) 971 kprintf("IPDEL %p %08x %d", ip, ip->flags, error); 972 973 if (error == 0) { 974 error = hammer_ip_delete_record(cursor, ip, trans->tid); 975 if (hammer_debug_inode) 976 kprintf(" error %d\n", error); 977 if (error == 0) { 978 ip->flags |= HAMMER_INODE_DELONDISK; 979 } 980 if (cursor->node) 981 hammer_cache_node(&ip->cache[0], cursor->node); 982 } 983 if (error == EDEADLK) { 984 hammer_done_cursor(cursor); 985 error = hammer_init_cursor(trans, cursor, 986 &ip->cache[0], ip); 987 if (hammer_debug_inode) 988 kprintf("IPDED %p %d\n", ip, error); 989 if (error == 0) 990 goto retry; 991 } 992 } 993 994 /* 995 * Ok, write out the initial record or a new record (after deleting 996 * the old one), unless the DELETED flag is set. This routine will 997 * clear DELONDISK if it writes out a record. 998 * 999 * Update our inode statistics if this is the first application of 1000 * the inode on-disk. 1001 */ 1002 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { 1003 /* 1004 * Generate a record and write it to the media. We clean-up 1005 * the state before releasing so we do not have to set-up 1006 * a flush_group. 1007 */ 1008 record = hammer_alloc_mem_record(ip, 0); 1009 record->type = HAMMER_MEM_RECORD_INODE; 1010 record->flush_state = HAMMER_FST_FLUSH; 1011 record->leaf = ip->sync_ino_leaf; 1012 record->leaf.base.create_tid = trans->tid; 1013 record->leaf.data_len = sizeof(ip->sync_ino_data); 1014 record->leaf.create_ts = trans->time32; 1015 record->data = (void *)&ip->sync_ino_data; 1016 record->flags |= HAMMER_RECF_INTERLOCK_BE; 1017 1018 /* 1019 * If this flag is set we cannot sync the new file size 1020 * because we haven't finished related truncations. The 1021 * inode will be flushed in another flush group to finish 1022 * the job. 1023 */ 1024 if ((ip->flags & HAMMER_INODE_WOULDBLOCK) && 1025 ip->sync_ino_data.size != ip->ino_data.size) { 1026 redirty = 1; 1027 ip->sync_ino_data.size = ip->ino_data.size; 1028 } else { 1029 redirty = 0; 1030 } 1031 1032 for (;;) { 1033 error = hammer_ip_sync_record_cursor(cursor, record); 1034 if (hammer_debug_inode) 1035 kprintf("GENREC %p rec %08x %d\n", 1036 ip, record->flags, error); 1037 if (error != EDEADLK) 1038 break; 1039 hammer_done_cursor(cursor); 1040 error = hammer_init_cursor(trans, cursor, 1041 &ip->cache[0], ip); 1042 if (hammer_debug_inode) 1043 kprintf("GENREC reinit %d\n", error); 1044 if (error) 1045 break; 1046 } 1047 1048 /* 1049 * The record isn't managed by the inode's record tree, 1050 * destroy it whether we succeed or fail. 1051 */ 1052 record->flags &= ~HAMMER_RECF_INTERLOCK_BE; 1053 record->flags |= HAMMER_RECF_DELETED_FE | HAMMER_RECF_COMMITTED; 1054 record->flush_state = HAMMER_FST_IDLE; 1055 hammer_rel_mem_record(record); 1056 1057 /* 1058 * Finish up. 1059 */ 1060 if (error == 0) { 1061 if (hammer_debug_inode) 1062 kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); 1063 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1064 HAMMER_INODE_ATIME | 1065 HAMMER_INODE_MTIME); 1066 ip->flags &= ~HAMMER_INODE_DELONDISK; 1067 if (redirty) 1068 ip->sync_flags |= HAMMER_INODE_DDIRTY; 1069 1070 /* 1071 * Root volume count of inodes 1072 */ 1073 hammer_sync_lock_sh(trans); 1074 if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { 1075 hammer_modify_volume_field(trans, 1076 trans->rootvol, 1077 vol0_stat_inodes); 1078 ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; 1079 hammer_modify_volume_done(trans->rootvol); 1080 ip->flags |= HAMMER_INODE_ONDISK; 1081 if (hammer_debug_inode) 1082 kprintf("NOWONDISK %p\n", ip); 1083 } 1084 hammer_sync_unlock(trans); 1085 } 1086 } 1087 1088 /* 1089 * If the inode has been destroyed, clean out any left-over flags 1090 * that may have been set by the frontend. 1091 */ 1092 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { 1093 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | 1094 HAMMER_INODE_ATIME | 1095 HAMMER_INODE_MTIME); 1096 } 1097 return(error); 1098 } 1099 1100 /* 1101 * Update only the itimes fields. 1102 * 1103 * ATIME can be updated without generating any UNDO. MTIME is updated 1104 * with UNDO so it is guaranteed to be synchronized properly in case of 1105 * a crash. 1106 * 1107 * Neither field is included in the B-Tree leaf element's CRC, which is how 1108 * we can get away with updating ATIME the way we do. 1109 */ 1110 static int 1111 hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) 1112 { 1113 hammer_transaction_t trans = cursor->trans; 1114 int error; 1115 1116 retry: 1117 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) != 1118 HAMMER_INODE_ONDISK) { 1119 return(0); 1120 } 1121 1122 hammer_normalize_cursor(cursor); 1123 cursor->key_beg.localization = ip->obj_localization + 1124 HAMMER_LOCALIZE_INODE; 1125 cursor->key_beg.obj_id = ip->obj_id; 1126 cursor->key_beg.key = 0; 1127 cursor->key_beg.create_tid = 0; 1128 cursor->key_beg.delete_tid = 0; 1129 cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; 1130 cursor->key_beg.obj_type = 0; 1131 cursor->asof = ip->obj_asof; 1132 cursor->flags &= ~HAMMER_CURSOR_INITMASK; 1133 cursor->flags |= HAMMER_CURSOR_ASOF; 1134 cursor->flags |= HAMMER_CURSOR_GET_LEAF; 1135 cursor->flags |= HAMMER_CURSOR_GET_DATA; 1136 cursor->flags |= HAMMER_CURSOR_BACKEND; 1137 1138 error = hammer_btree_lookup(cursor); 1139 if (error == 0) { 1140 hammer_cache_node(&ip->cache[0], cursor->node); 1141 if (ip->sync_flags & HAMMER_INODE_MTIME) { 1142 /* 1143 * Updating MTIME requires an UNDO. Just cover 1144 * both atime and mtime. 1145 */ 1146 hammer_sync_lock_sh(trans); 1147 hammer_modify_buffer(trans, cursor->data_buffer, 1148 HAMMER_ITIMES_BASE(&cursor->data->inode), 1149 HAMMER_ITIMES_BYTES); 1150 cursor->data->inode.atime = ip->sync_ino_data.atime; 1151 cursor->data->inode.mtime = ip->sync_ino_data.mtime; 1152 hammer_modify_buffer_done(cursor->data_buffer); 1153 hammer_sync_unlock(trans); 1154 } else if (ip->sync_flags & HAMMER_INODE_ATIME) { 1155 /* 1156 * Updating atime only can be done in-place with 1157 * no UNDO. 1158 */ 1159 hammer_sync_lock_sh(trans); 1160 hammer_modify_buffer(trans, cursor->data_buffer, 1161 NULL, 0); 1162 cursor->data->inode.atime = ip->sync_ino_data.atime; 1163 hammer_modify_buffer_done(cursor->data_buffer); 1164 hammer_sync_unlock(trans); 1165 } 1166 ip->sync_flags &= ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME); 1167 } 1168 if (error == EDEADLK) { 1169 hammer_done_cursor(cursor); 1170 error = hammer_init_cursor(trans, cursor, 1171 &ip->cache[0], ip); 1172 if (error == 0) 1173 goto retry; 1174 } 1175 return(error); 1176 } 1177 1178 /* 1179 * Release a reference on an inode, flush as requested. 1180 * 1181 * On the last reference we queue the inode to the flusher for its final 1182 * disposition. 1183 */ 1184 void 1185 hammer_rel_inode(struct hammer_inode *ip, int flush) 1186 { 1187 /*hammer_mount_t hmp = ip->hmp;*/ 1188 1189 /* 1190 * Handle disposition when dropping the last ref. 1191 */ 1192 for (;;) { 1193 if (ip->lock.refs == 1) { 1194 /* 1195 * Determine whether on-disk action is needed for 1196 * the inode's final disposition. 1197 */ 1198 KKASSERT(ip->vp == NULL); 1199 hammer_inode_unloadable_check(ip, 0); 1200 if (ip->flags & HAMMER_INODE_MODMASK) { 1201 hammer_flush_inode(ip, 0); 1202 } else if (ip->lock.refs == 1) { 1203 hammer_unload_inode(ip); 1204 break; 1205 } 1206 } else { 1207 if (flush) 1208 hammer_flush_inode(ip, 0); 1209 1210 /* 1211 * The inode still has multiple refs, try to drop 1212 * one ref. 1213 */ 1214 KKASSERT(ip->lock.refs >= 1); 1215 if (ip->lock.refs > 1) { 1216 hammer_unref(&ip->lock); 1217 break; 1218 } 1219 } 1220 } 1221 } 1222 1223 /* 1224 * Unload and destroy the specified inode. Must be called with one remaining 1225 * reference. The reference is disposed of. 1226 * 1227 * The inode must be completely clean. 1228 */ 1229 static int 1230 hammer_unload_inode(struct hammer_inode *ip) 1231 { 1232 hammer_mount_t hmp = ip->hmp; 1233 1234 KASSERT(ip->lock.refs == 1, 1235 ("hammer_unload_inode: %d refs\n", ip->lock.refs)); 1236 KKASSERT(ip->vp == NULL); 1237 KKASSERT(ip->flush_state == HAMMER_FST_IDLE); 1238 KKASSERT(ip->cursor_ip_refs == 0); 1239 KKASSERT(ip->lock.lockcount == 0); 1240 KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); 1241 1242 KKASSERT(RB_EMPTY(&ip->rec_tree)); 1243 KKASSERT(TAILQ_EMPTY(&ip->target_list)); 1244 1245 RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); 1246 1247 hammer_free_inode(ip); 1248 return(0); 1249 } 1250 1251 /* 1252 * Called during unmounting if a critical error occured. The in-memory 1253 * inode and all related structures are destroyed. 1254 * 1255 * If a critical error did not occur the unmount code calls the standard 1256 * release and asserts that the inode is gone. 1257 */ 1258 int 1259 hammer_destroy_inode_callback(struct hammer_inode *ip, void *data __unused) 1260 { 1261 hammer_record_t rec; 1262 1263 /* 1264 * Get rid of the inodes in-memory records, regardless of their 1265 * state, and clear the mod-mask. 1266 */ 1267 while ((rec = TAILQ_FIRST(&ip->target_list)) != NULL) { 1268 TAILQ_REMOVE(&ip->target_list, rec, target_entry); 1269 rec->target_ip = NULL; 1270 if (rec->flush_state == HAMMER_FST_SETUP) 1271 rec->flush_state = HAMMER_FST_IDLE; 1272 } 1273 while ((rec = RB_ROOT(&ip->rec_tree)) != NULL) { 1274 if (rec->flush_state == HAMMER_FST_FLUSH) 1275 --rec->flush_group->refs; 1276 else 1277 hammer_ref(&rec->lock); 1278 KKASSERT(rec->lock.refs == 1); 1279 rec->flush_state = HAMMER_FST_IDLE; 1280 rec->flush_group = NULL; 1281 rec->flags |= HAMMER_RECF_DELETED_FE; 1282 rec->flags |= HAMMER_RECF_DELETED_BE; 1283 hammer_rel_mem_record(rec); 1284 } 1285 ip->flags &= ~HAMMER_INODE_MODMASK; 1286 ip->sync_flags &= ~HAMMER_INODE_MODMASK; 1287 KKASSERT(ip->vp == NULL); 1288 1289 /* 1290 * Remove the inode from any flush group, force it idle. FLUSH 1291 * and SETUP states have an inode ref. 1292 */ 1293 switch(ip->flush_state) { 1294 case HAMMER_FST_FLUSH: 1295 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 1296 --ip->flush_group->refs; 1297 ip->flush_group = NULL; 1298 /* fall through */ 1299 case HAMMER_FST_SETUP: 1300 hammer_unref(&ip->lock); 1301 ip->flush_state = HAMMER_FST_IDLE; 1302 /* fall through */ 1303 case HAMMER_FST_IDLE: 1304 break; 1305 } 1306 1307 /* 1308 * There shouldn't be any associated vnode. The unload needs at 1309 * least one ref, if we do have a vp steal its ip ref. 1310 */ 1311 if (ip->vp) { 1312 kprintf("hammer_destroy_inode_callback: Unexpected " 1313 "vnode association ip %p vp %p\n", ip, ip->vp); 1314 ip->vp->v_data = NULL; 1315 ip->vp = NULL; 1316 } else { 1317 hammer_ref(&ip->lock); 1318 } 1319 hammer_unload_inode(ip); 1320 return(0); 1321 } 1322 1323 /* 1324 * Called on mount -u when switching from RW to RO or vise-versa. Adjust 1325 * the read-only flag for cached inodes. 1326 * 1327 * This routine is called from a RB_SCAN(). 1328 */ 1329 int 1330 hammer_reload_inode(hammer_inode_t ip, void *arg __unused) 1331 { 1332 hammer_mount_t hmp = ip->hmp; 1333 1334 if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) 1335 ip->flags |= HAMMER_INODE_RO; 1336 else 1337 ip->flags &= ~HAMMER_INODE_RO; 1338 return(0); 1339 } 1340 1341 /* 1342 * A transaction has modified an inode, requiring updates as specified by 1343 * the passed flags. 1344 * 1345 * HAMMER_INODE_DDIRTY: Inode data has been updated 1346 * HAMMER_INODE_XDIRTY: Dirty in-memory records 1347 * HAMMER_INODE_BUFS: Dirty buffer cache buffers 1348 * HAMMER_INODE_DELETED: Inode record/data must be deleted 1349 * HAMMER_INODE_ATIME/MTIME: mtime/atime has been updated 1350 */ 1351 void 1352 hammer_modify_inode(hammer_inode_t ip, int flags) 1353 { 1354 /* 1355 * ronly of 0 or 2 does not trigger assertion. 1356 * 2 is a special error state 1357 */ 1358 KKASSERT(ip->hmp->ronly != 1 || 1359 (flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 1360 HAMMER_INODE_BUFS | HAMMER_INODE_DELETED | 1361 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) == 0); 1362 if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { 1363 ip->flags |= HAMMER_INODE_RSV_INODES; 1364 ++ip->hmp->rsv_inodes; 1365 } 1366 1367 ip->flags |= flags; 1368 } 1369 1370 /* 1371 * Request that an inode be flushed. This whole mess cannot block and may 1372 * recurse (if not synchronous). Once requested HAMMER will attempt to 1373 * actively flush the inode until the flush can be done. 1374 * 1375 * The inode may already be flushing, or may be in a setup state. We can 1376 * place the inode in a flushing state if it is currently idle and flag it 1377 * to reflush if it is currently flushing. 1378 * 1379 * Upon return if the inode could not be flushed due to a setup 1380 * dependancy, then it will be automatically flushed when the dependancy 1381 * is satisfied. 1382 */ 1383 void 1384 hammer_flush_inode(hammer_inode_t ip, int flags) 1385 { 1386 hammer_mount_t hmp; 1387 hammer_flush_group_t flg; 1388 int good; 1389 1390 /* 1391 * next_flush_group is the first flush group we can place the inode 1392 * in. It may be NULL. If it becomes full we append a new flush 1393 * group and make that the next_flush_group. 1394 */ 1395 hmp = ip->hmp; 1396 while ((flg = hmp->next_flush_group) != NULL) { 1397 KKASSERT(flg->running == 0); 1398 if (flg->total_count + flg->refs <= ip->hmp->undo_rec_limit) 1399 break; 1400 hmp->next_flush_group = TAILQ_NEXT(flg, flush_entry); 1401 hammer_flusher_async(ip->hmp, flg); 1402 } 1403 if (flg == NULL) { 1404 flg = kmalloc(sizeof(*flg), hmp->m_misc, M_WAITOK|M_ZERO); 1405 hmp->next_flush_group = flg; 1406 TAILQ_INIT(&flg->flush_list); 1407 TAILQ_INSERT_TAIL(&hmp->flush_group_list, flg, flush_entry); 1408 } 1409 1410 /* 1411 * Trivial 'nothing to flush' case. If the inode is in a SETUP 1412 * state we have to put it back into an IDLE state so we can 1413 * drop the extra ref. 1414 * 1415 * If we have a parent dependancy we must still fall through 1416 * so we can run it. 1417 */ 1418 if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { 1419 if (ip->flush_state == HAMMER_FST_SETUP && 1420 TAILQ_EMPTY(&ip->target_list)) { 1421 ip->flush_state = HAMMER_FST_IDLE; 1422 hammer_rel_inode(ip, 0); 1423 } 1424 if (ip->flush_state == HAMMER_FST_IDLE) 1425 return; 1426 } 1427 1428 /* 1429 * Our flush action will depend on the current state. 1430 */ 1431 switch(ip->flush_state) { 1432 case HAMMER_FST_IDLE: 1433 /* 1434 * We have no dependancies and can flush immediately. Some 1435 * our children may not be flushable so we have to re-test 1436 * with that additional knowledge. 1437 */ 1438 hammer_flush_inode_core(ip, flg, flags); 1439 break; 1440 case HAMMER_FST_SETUP: 1441 /* 1442 * Recurse upwards through dependancies via target_list 1443 * and start their flusher actions going if possible. 1444 * 1445 * 'good' is our connectivity. -1 means we have none and 1446 * can't flush, 0 means there weren't any dependancies, and 1447 * 1 means we have good connectivity. 1448 */ 1449 good = hammer_setup_parent_inodes(ip, flg); 1450 1451 if (good >= 0) { 1452 /* 1453 * We can continue if good >= 0. Determine how 1454 * many records under our inode can be flushed (and 1455 * mark them). 1456 */ 1457 hammer_flush_inode_core(ip, flg, flags); 1458 } else { 1459 /* 1460 * Parent has no connectivity, tell it to flush 1461 * us as soon as it does. 1462 * 1463 * The REFLUSH flag is also needed to trigger 1464 * dependancy wakeups. 1465 */ 1466 ip->flags |= HAMMER_INODE_CONN_DOWN | 1467 HAMMER_INODE_REFLUSH; 1468 if (flags & HAMMER_FLUSH_SIGNAL) { 1469 ip->flags |= HAMMER_INODE_RESIGNAL; 1470 hammer_flusher_async(ip->hmp, flg); 1471 } 1472 } 1473 break; 1474 case HAMMER_FST_FLUSH: 1475 /* 1476 * We are already flushing, flag the inode to reflush 1477 * if needed after it completes its current flush. 1478 * 1479 * The REFLUSH flag is also needed to trigger 1480 * dependancy wakeups. 1481 */ 1482 if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) 1483 ip->flags |= HAMMER_INODE_REFLUSH; 1484 if (flags & HAMMER_FLUSH_SIGNAL) { 1485 ip->flags |= HAMMER_INODE_RESIGNAL; 1486 hammer_flusher_async(ip->hmp, flg); 1487 } 1488 break; 1489 } 1490 } 1491 1492 /* 1493 * Scan ip->target_list, which is a list of records owned by PARENTS to our 1494 * ip which reference our ip. 1495 * 1496 * XXX This is a huge mess of recursive code, but not one bit of it blocks 1497 * so for now do not ref/deref the structures. Note that if we use the 1498 * ref/rel code later, the rel CAN block. 1499 */ 1500 static int 1501 hammer_setup_parent_inodes(hammer_inode_t ip, hammer_flush_group_t flg) 1502 { 1503 hammer_record_t depend; 1504 int good; 1505 int r; 1506 1507 good = 0; 1508 TAILQ_FOREACH(depend, &ip->target_list, target_entry) { 1509 r = hammer_setup_parent_inodes_helper(depend, flg); 1510 KKASSERT(depend->target_ip == ip); 1511 if (r < 0 && good == 0) 1512 good = -1; 1513 if (r > 0) 1514 good = 1; 1515 } 1516 return(good); 1517 } 1518 1519 /* 1520 * This helper function takes a record representing the dependancy between 1521 * the parent inode and child inode. 1522 * 1523 * record->ip = parent inode 1524 * record->target_ip = child inode 1525 * 1526 * We are asked to recurse upwards and convert the record from SETUP 1527 * to FLUSH if possible. 1528 * 1529 * Return 1 if the record gives us connectivity 1530 * 1531 * Return 0 if the record is not relevant 1532 * 1533 * Return -1 if we can't resolve the dependancy and there is no connectivity. 1534 */ 1535 static int 1536 hammer_setup_parent_inodes_helper(hammer_record_t record, 1537 hammer_flush_group_t flg) 1538 { 1539 hammer_mount_t hmp; 1540 hammer_inode_t pip; 1541 int good; 1542 1543 KKASSERT(record->flush_state != HAMMER_FST_IDLE); 1544 pip = record->ip; 1545 hmp = pip->hmp; 1546 1547 /* 1548 * If the record is already flushing, is it in our flush group? 1549 * 1550 * If it is in our flush group but it is a general record or a 1551 * delete-on-disk, it does not improve our connectivity (return 0), 1552 * and if the target inode is not trying to destroy itself we can't 1553 * allow the operation yet anyway (the second return -1). 1554 */ 1555 if (record->flush_state == HAMMER_FST_FLUSH) { 1556 /* 1557 * If not in our flush group ask the parent to reflush 1558 * us as soon as possible. 1559 */ 1560 if (record->flush_group != flg) { 1561 pip->flags |= HAMMER_INODE_REFLUSH; 1562 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1563 return(-1); 1564 } 1565 1566 /* 1567 * If in our flush group everything is already set up, 1568 * just return whether the record will improve our 1569 * visibility or not. 1570 */ 1571 if (record->type == HAMMER_MEM_RECORD_ADD) 1572 return(1); 1573 return(0); 1574 } 1575 1576 /* 1577 * It must be a setup record. Try to resolve the setup dependancies 1578 * by recursing upwards so we can place ip on the flush list. 1579 */ 1580 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1581 1582 good = hammer_setup_parent_inodes(pip, flg); 1583 1584 /* 1585 * If good < 0 the parent has no connectivity and we cannot safely 1586 * flush the directory entry, which also means we can't flush our 1587 * ip. Flag the parent and us for downward recursion once the 1588 * parent's connectivity is resolved. 1589 */ 1590 if (good < 0) { 1591 /* pip->flags |= HAMMER_INODE_CONN_DOWN; set by recursion */ 1592 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1593 return(good); 1594 } 1595 1596 /* 1597 * We are go, place the parent inode in a flushing state so we can 1598 * place its record in a flushing state. Note that the parent 1599 * may already be flushing. The record must be in the same flush 1600 * group as the parent. 1601 */ 1602 if (pip->flush_state != HAMMER_FST_FLUSH) 1603 hammer_flush_inode_core(pip, flg, HAMMER_FLUSH_RECURSION); 1604 KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); 1605 KKASSERT(record->flush_state == HAMMER_FST_SETUP); 1606 1607 #if 0 1608 if (record->type == HAMMER_MEM_RECORD_DEL && 1609 (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { 1610 /* 1611 * Regardless of flushing state we cannot sync this path if the 1612 * record represents a delete-on-disk but the target inode 1613 * is not ready to sync its own deletion. 1614 * 1615 * XXX need to count effective nlinks to determine whether 1616 * the flush is ok, otherwise removing a hardlink will 1617 * just leave the DEL record to rot. 1618 */ 1619 record->target_ip->flags |= HAMMER_INODE_REFLUSH; 1620 return(-1); 1621 } else 1622 #endif 1623 if (pip->flush_group == flg) { 1624 /* 1625 * Because we have not calculated nlinks yet we can just 1626 * set records to the flush state if the parent is in 1627 * the same flush group as we are. 1628 */ 1629 record->flush_state = HAMMER_FST_FLUSH; 1630 record->flush_group = flg; 1631 ++record->flush_group->refs; 1632 hammer_ref(&record->lock); 1633 1634 /* 1635 * A general directory-add contributes to our visibility. 1636 * 1637 * Otherwise it is probably a directory-delete or 1638 * delete-on-disk record and does not contribute to our 1639 * visbility (but we can still flush it). 1640 */ 1641 if (record->type == HAMMER_MEM_RECORD_ADD) 1642 return(1); 1643 return(0); 1644 } else { 1645 /* 1646 * If the parent is not in our flush group we cannot 1647 * flush this record yet, there is no visibility. 1648 * We tell the parent to reflush and mark ourselves 1649 * so the parent knows it should flush us too. 1650 */ 1651 pip->flags |= HAMMER_INODE_REFLUSH; 1652 record->target_ip->flags |= HAMMER_INODE_CONN_DOWN; 1653 return(-1); 1654 } 1655 } 1656 1657 /* 1658 * This is the core routine placing an inode into the FST_FLUSH state. 1659 */ 1660 static void 1661 hammer_flush_inode_core(hammer_inode_t ip, hammer_flush_group_t flg, int flags) 1662 { 1663 int go_count; 1664 1665 /* 1666 * Set flush state and prevent the flusher from cycling into 1667 * the next flush group. Do not place the ip on the list yet. 1668 * Inodes not in the idle state get an extra reference. 1669 */ 1670 KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); 1671 if (ip->flush_state == HAMMER_FST_IDLE) 1672 hammer_ref(&ip->lock); 1673 ip->flush_state = HAMMER_FST_FLUSH; 1674 ip->flush_group = flg; 1675 ++ip->hmp->flusher.group_lock; 1676 ++ip->hmp->count_iqueued; 1677 ++hammer_count_iqueued; 1678 ++flg->total_count; 1679 1680 /* 1681 * If the flush group reaches the autoflush limit we want to signal 1682 * the flusher. This is particularly important for remove()s. 1683 */ 1684 if (flg->total_count == hammer_autoflush) 1685 flags |= HAMMER_FLUSH_SIGNAL; 1686 1687 /* 1688 * We need to be able to vfsync/truncate from the backend. 1689 */ 1690 KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); 1691 if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { 1692 ip->flags |= HAMMER_INODE_VHELD; 1693 vref(ip->vp); 1694 } 1695 1696 /* 1697 * Figure out how many in-memory records we can actually flush 1698 * (not including inode meta-data, buffers, etc). 1699 */ 1700 KKASSERT((ip->flags & HAMMER_INODE_WOULDBLOCK) == 0); 1701 if (flags & HAMMER_FLUSH_RECURSION) { 1702 /* 1703 * If this is a upwards recursion we do not want to 1704 * recurse down again! 1705 */ 1706 go_count = 1; 1707 #if 0 1708 } else if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 1709 /* 1710 * No new records are added if we must complete a flush 1711 * from a previous cycle, but we do have to move the records 1712 * from the previous cycle to the current one. 1713 */ 1714 #if 0 1715 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1716 hammer_syncgrp_child_callback, NULL); 1717 #endif 1718 go_count = 1; 1719 #endif 1720 } else { 1721 /* 1722 * Normal flush, scan records and bring them into the flush. 1723 * Directory adds and deletes are usually skipped (they are 1724 * grouped with the related inode rather then with the 1725 * directory). 1726 * 1727 * go_count can be negative, which means the scan aborted 1728 * due to the flush group being over-full and we should 1729 * flush what we have. 1730 */ 1731 go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 1732 hammer_setup_child_callback, NULL); 1733 } 1734 1735 /* 1736 * This is a more involved test that includes go_count. If we 1737 * can't flush, flag the inode and return. If go_count is 0 we 1738 * were are unable to flush any records in our rec_tree and 1739 * must ignore the XDIRTY flag. 1740 */ 1741 if (go_count == 0) { 1742 if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { 1743 --ip->hmp->count_iqueued; 1744 --hammer_count_iqueued; 1745 1746 --flg->total_count; 1747 ip->flush_state = HAMMER_FST_SETUP; 1748 ip->flush_group = NULL; 1749 if (ip->flags & HAMMER_INODE_VHELD) { 1750 ip->flags &= ~HAMMER_INODE_VHELD; 1751 vrele(ip->vp); 1752 } 1753 1754 /* 1755 * REFLUSH is needed to trigger dependancy wakeups 1756 * when an inode is in SETUP. 1757 */ 1758 ip->flags |= HAMMER_INODE_REFLUSH; 1759 if (flags & HAMMER_FLUSH_SIGNAL) { 1760 ip->flags |= HAMMER_INODE_RESIGNAL; 1761 hammer_flusher_async(ip->hmp, flg); 1762 } 1763 if (--ip->hmp->flusher.group_lock == 0) 1764 wakeup(&ip->hmp->flusher.group_lock); 1765 return; 1766 } 1767 } 1768 1769 /* 1770 * Snapshot the state of the inode for the backend flusher. 1771 * 1772 * We continue to retain save_trunc_off even when all truncations 1773 * have been resolved as an optimization to determine if we can 1774 * skip the B-Tree lookup for overwrite deletions. 1775 * 1776 * NOTE: The DELETING flag is a mod flag, but it is also sticky, 1777 * and stays in ip->flags. Once set, it stays set until the 1778 * inode is destroyed. 1779 */ 1780 if (ip->flags & HAMMER_INODE_TRUNCATED) { 1781 KKASSERT((ip->sync_flags & HAMMER_INODE_TRUNCATED) == 0); 1782 ip->sync_trunc_off = ip->trunc_off; 1783 ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; 1784 ip->flags &= ~HAMMER_INODE_TRUNCATED; 1785 ip->sync_flags |= HAMMER_INODE_TRUNCATED; 1786 1787 /* 1788 * The save_trunc_off used to cache whether the B-Tree 1789 * holds any records past that point is not used until 1790 * after the truncation has succeeded, so we can safely 1791 * set it now. 1792 */ 1793 if (ip->save_trunc_off > ip->sync_trunc_off) 1794 ip->save_trunc_off = ip->sync_trunc_off; 1795 } 1796 ip->sync_flags |= (ip->flags & HAMMER_INODE_MODMASK & 1797 ~HAMMER_INODE_TRUNCATED); 1798 ip->sync_ino_leaf = ip->ino_leaf; 1799 ip->sync_ino_data = ip->ino_data; 1800 ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; 1801 #ifdef DEBUG_TRUNCATE 1802 if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp) 1803 kprintf("truncateS %016llx\n", ip->sync_trunc_off); 1804 #endif 1805 1806 /* 1807 * The flusher list inherits our inode and reference. 1808 */ 1809 KKASSERT(flg->running == 0); 1810 TAILQ_INSERT_TAIL(&flg->flush_list, ip, flush_entry); 1811 if (--ip->hmp->flusher.group_lock == 0) 1812 wakeup(&ip->hmp->flusher.group_lock); 1813 1814 if (flags & HAMMER_FLUSH_SIGNAL) { 1815 hammer_flusher_async(ip->hmp, flg); 1816 } 1817 } 1818 1819 /* 1820 * Callback for scan of ip->rec_tree. Try to include each record in our 1821 * flush. ip->flush_group has been set but the inode has not yet been 1822 * moved into a flushing state. 1823 * 1824 * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on 1825 * both inodes. 1826 * 1827 * We return 1 for any record placed or found in FST_FLUSH, which prevents 1828 * the caller from shortcutting the flush. 1829 */ 1830 static int 1831 hammer_setup_child_callback(hammer_record_t rec, void *data) 1832 { 1833 hammer_flush_group_t flg; 1834 hammer_inode_t target_ip; 1835 hammer_inode_t ip; 1836 int r; 1837 1838 /* 1839 * Deleted records are ignored. Note that the flush detects deleted 1840 * front-end records at multiple points to deal with races. This is 1841 * just the first line of defense. The only time DELETED_FE cannot 1842 * be set is when HAMMER_RECF_INTERLOCK_BE is set. 1843 * 1844 * Don't get confused between record deletion and, say, directory 1845 * entry deletion. The deletion of a directory entry that is on 1846 * the media has nothing to do with the record deletion flags. 1847 */ 1848 if (rec->flags & (HAMMER_RECF_DELETED_FE|HAMMER_RECF_DELETED_BE)) { 1849 if (rec->flush_state == HAMMER_FST_FLUSH) { 1850 KKASSERT(rec->flush_group == rec->ip->flush_group); 1851 r = 1; 1852 } else { 1853 r = 0; 1854 } 1855 return(r); 1856 } 1857 1858 /* 1859 * If the record is in an idle state it has no dependancies and 1860 * can be flushed. 1861 */ 1862 ip = rec->ip; 1863 flg = ip->flush_group; 1864 r = 0; 1865 1866 switch(rec->flush_state) { 1867 case HAMMER_FST_IDLE: 1868 /* 1869 * The record has no setup dependancy, we can flush it. 1870 */ 1871 KKASSERT(rec->target_ip == NULL); 1872 rec->flush_state = HAMMER_FST_FLUSH; 1873 rec->flush_group = flg; 1874 ++flg->refs; 1875 hammer_ref(&rec->lock); 1876 r = 1; 1877 break; 1878 case HAMMER_FST_SETUP: 1879 /* 1880 * The record has a setup dependancy. These are typically 1881 * directory entry adds and deletes. Such entries will be 1882 * flushed when their inodes are flushed so we do not 1883 * usually have to add them to the flush here. However, 1884 * if the target_ip has set HAMMER_INODE_CONN_DOWN then 1885 * it is asking us to flush this record (and it). 1886 */ 1887 target_ip = rec->target_ip; 1888 KKASSERT(target_ip != NULL); 1889 KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); 1890 1891 /* 1892 * If the target IP is already flushing in our group 1893 * we could associate the record, but target_ip has 1894 * already synced ino_data to sync_ino_data and we 1895 * would also have to adjust nlinks. Plus there are 1896 * ordering issues for adds and deletes. 1897 * 1898 * Reflush downward if this is an ADD, and upward if 1899 * this is a DEL. 1900 */ 1901 if (target_ip->flush_state == HAMMER_FST_FLUSH) { 1902 if (rec->flush_state == HAMMER_MEM_RECORD_ADD) 1903 ip->flags |= HAMMER_INODE_REFLUSH; 1904 else 1905 target_ip->flags |= HAMMER_INODE_REFLUSH; 1906 break; 1907 } 1908 1909 /* 1910 * Target IP is not yet flushing. This can get complex 1911 * because we have to be careful about the recursion. 1912 * 1913 * Directories create an issue for us in that if a flush 1914 * of a directory is requested the expectation is to flush 1915 * any pending directory entries, but this will cause the 1916 * related inodes to recursively flush as well. We can't 1917 * really defer the operation so just get as many as we 1918 * can and 1919 */ 1920 #if 0 1921 if ((target_ip->flags & HAMMER_INODE_RECLAIM) == 0 && 1922 (target_ip->flags & HAMMER_INODE_CONN_DOWN) == 0) { 1923 /* 1924 * We aren't reclaiming and the target ip was not 1925 * previously prevented from flushing due to this 1926 * record dependancy. Do not flush this record. 1927 */ 1928 /*r = 0;*/ 1929 } else 1930 #endif 1931 if (flg->total_count + flg->refs > 1932 ip->hmp->undo_rec_limit) { 1933 /* 1934 * Our flush group is over-full and we risk blowing 1935 * out the UNDO FIFO. Stop the scan, flush what we 1936 * have, then reflush the directory. 1937 * 1938 * The directory may be forced through multiple 1939 * flush groups before it can be completely 1940 * flushed. 1941 */ 1942 ip->flags |= HAMMER_INODE_RESIGNAL | 1943 HAMMER_INODE_REFLUSH; 1944 r = -1; 1945 } else if (rec->type == HAMMER_MEM_RECORD_ADD) { 1946 /* 1947 * If the target IP is not flushing we can force 1948 * it to flush, even if it is unable to write out 1949 * any of its own records we have at least one in 1950 * hand that we CAN deal with. 1951 */ 1952 rec->flush_state = HAMMER_FST_FLUSH; 1953 rec->flush_group = flg; 1954 ++flg->refs; 1955 hammer_ref(&rec->lock); 1956 hammer_flush_inode_core(target_ip, flg, 1957 HAMMER_FLUSH_RECURSION); 1958 r = 1; 1959 } else { 1960 /* 1961 * General or delete-on-disk record. 1962 * 1963 * XXX this needs help. If a delete-on-disk we could 1964 * disconnect the target. If the target has its own 1965 * dependancies they really need to be flushed. 1966 * 1967 * XXX 1968 */ 1969 rec->flush_state = HAMMER_FST_FLUSH; 1970 rec->flush_group = flg; 1971 ++flg->refs; 1972 hammer_ref(&rec->lock); 1973 hammer_flush_inode_core(target_ip, flg, 1974 HAMMER_FLUSH_RECURSION); 1975 r = 1; 1976 } 1977 break; 1978 case HAMMER_FST_FLUSH: 1979 /* 1980 * The flush_group should already match. 1981 */ 1982 KKASSERT(rec->flush_group == flg); 1983 r = 1; 1984 break; 1985 } 1986 return(r); 1987 } 1988 1989 #if 0 1990 /* 1991 * This version just moves records already in a flush state to the new 1992 * flush group and that is it. 1993 */ 1994 static int 1995 hammer_syncgrp_child_callback(hammer_record_t rec, void *data) 1996 { 1997 hammer_inode_t ip = rec->ip; 1998 1999 switch(rec->flush_state) { 2000 case HAMMER_FST_FLUSH: 2001 KKASSERT(rec->flush_group == ip->flush_group); 2002 break; 2003 default: 2004 break; 2005 } 2006 return(0); 2007 } 2008 #endif 2009 2010 /* 2011 * Wait for a previously queued flush to complete. 2012 * 2013 * If a critical error occured we don't try to wait. 2014 */ 2015 void 2016 hammer_wait_inode(hammer_inode_t ip) 2017 { 2018 hammer_flush_group_t flg; 2019 2020 flg = NULL; 2021 if ((ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2022 while (ip->flush_state != HAMMER_FST_IDLE && 2023 (ip->hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) == 0) { 2024 if (ip->flush_state == HAMMER_FST_SETUP) 2025 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2026 if (ip->flush_state != HAMMER_FST_IDLE) { 2027 ip->flags |= HAMMER_INODE_FLUSHW; 2028 tsleep(&ip->flags, 0, "hmrwin", 0); 2029 } 2030 } 2031 } 2032 } 2033 2034 /* 2035 * Called by the backend code when a flush has been completed. 2036 * The inode has already been removed from the flush list. 2037 * 2038 * A pipelined flush can occur, in which case we must re-enter the 2039 * inode on the list and re-copy its fields. 2040 */ 2041 void 2042 hammer_flush_inode_done(hammer_inode_t ip, int error) 2043 { 2044 hammer_mount_t hmp; 2045 int dorel; 2046 2047 KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); 2048 2049 hmp = ip->hmp; 2050 2051 /* 2052 * Auto-reflush if the backend could not completely flush 2053 * the inode. This fixes a case where a deferred buffer flush 2054 * could cause fsync to return early. 2055 */ 2056 if (ip->sync_flags & HAMMER_INODE_MODMASK) 2057 ip->flags |= HAMMER_INODE_REFLUSH; 2058 2059 /* 2060 * Merge left-over flags back into the frontend and fix the state. 2061 * Incomplete truncations are retained by the backend. 2062 */ 2063 ip->error = error; 2064 ip->flags |= ip->sync_flags & ~HAMMER_INODE_TRUNCATED; 2065 ip->sync_flags &= HAMMER_INODE_TRUNCATED; 2066 2067 /* 2068 * The backend may have adjusted nlinks, so if the adjusted nlinks 2069 * does not match the fronttend set the frontend's RDIRTY flag again. 2070 */ 2071 if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) 2072 ip->flags |= HAMMER_INODE_DDIRTY; 2073 2074 /* 2075 * Fix up the dirty buffer status. 2076 */ 2077 if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { 2078 ip->flags |= HAMMER_INODE_BUFS; 2079 } 2080 2081 /* 2082 * Re-set the XDIRTY flag if some of the inode's in-memory records 2083 * could not be flushed. 2084 */ 2085 KKASSERT((RB_EMPTY(&ip->rec_tree) && 2086 (ip->flags & HAMMER_INODE_XDIRTY) == 0) || 2087 (!RB_EMPTY(&ip->rec_tree) && 2088 (ip->flags & HAMMER_INODE_XDIRTY) != 0)); 2089 2090 /* 2091 * Do not lose track of inodes which no longer have vnode 2092 * assocations, otherwise they may never get flushed again. 2093 * 2094 * The reflush flag can be set superfluously, causing extra pain 2095 * for no reason. If the inode is no longer modified it no longer 2096 * needs to be flushed. 2097 */ 2098 if (ip->flags & HAMMER_INODE_MODMASK) { 2099 if (ip->vp == NULL) 2100 ip->flags |= HAMMER_INODE_REFLUSH; 2101 } else { 2102 ip->flags &= ~HAMMER_INODE_REFLUSH; 2103 } 2104 2105 /* 2106 * Adjust the flush state. 2107 */ 2108 if (ip->flags & HAMMER_INODE_WOULDBLOCK) { 2109 /* 2110 * We were unable to flush out all our records, leave the 2111 * inode in a flush state and in the current flush group. 2112 * The flush group will be re-run. 2113 * 2114 * This occurs if the UNDO block gets too full or there is 2115 * too much dirty meta-data and allows the flusher to 2116 * finalize the UNDO block and then re-flush. 2117 */ 2118 ip->flags &= ~HAMMER_INODE_WOULDBLOCK; 2119 dorel = 0; 2120 } else { 2121 /* 2122 * Remove from the flush_group 2123 */ 2124 TAILQ_REMOVE(&ip->flush_group->flush_list, ip, flush_entry); 2125 ip->flush_group = NULL; 2126 2127 /* 2128 * Clean up the vnode ref and tracking counts. 2129 */ 2130 if (ip->flags & HAMMER_INODE_VHELD) { 2131 ip->flags &= ~HAMMER_INODE_VHELD; 2132 vrele(ip->vp); 2133 } 2134 --hmp->count_iqueued; 2135 --hammer_count_iqueued; 2136 2137 /* 2138 * And adjust the state. 2139 */ 2140 if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { 2141 ip->flush_state = HAMMER_FST_IDLE; 2142 dorel = 1; 2143 } else { 2144 ip->flush_state = HAMMER_FST_SETUP; 2145 dorel = 0; 2146 } 2147 2148 /* 2149 * If the frontend is waiting for a flush to complete, 2150 * wake it up. 2151 */ 2152 if (ip->flags & HAMMER_INODE_FLUSHW) { 2153 ip->flags &= ~HAMMER_INODE_FLUSHW; 2154 wakeup(&ip->flags); 2155 } 2156 2157 /* 2158 * If the frontend made more changes and requested another 2159 * flush, then try to get it running. 2160 * 2161 * Reflushes are aborted when the inode is errored out. 2162 */ 2163 if (ip->flags & HAMMER_INODE_REFLUSH) { 2164 ip->flags &= ~HAMMER_INODE_REFLUSH; 2165 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2166 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2167 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2168 } else { 2169 hammer_flush_inode(ip, 0); 2170 } 2171 } 2172 } 2173 2174 /* 2175 * If we have no parent dependancies we can clear CONN_DOWN 2176 */ 2177 if (TAILQ_EMPTY(&ip->target_list)) 2178 ip->flags &= ~HAMMER_INODE_CONN_DOWN; 2179 2180 /* 2181 * If the inode is now clean drop the space reservation. 2182 */ 2183 if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && 2184 (ip->flags & HAMMER_INODE_RSV_INODES)) { 2185 ip->flags &= ~HAMMER_INODE_RSV_INODES; 2186 --hmp->rsv_inodes; 2187 } 2188 2189 if (dorel) 2190 hammer_rel_inode(ip, 0); 2191 } 2192 2193 /* 2194 * Called from hammer_sync_inode() to synchronize in-memory records 2195 * to the media. 2196 */ 2197 static int 2198 hammer_sync_record_callback(hammer_record_t record, void *data) 2199 { 2200 hammer_cursor_t cursor = data; 2201 hammer_transaction_t trans = cursor->trans; 2202 hammer_mount_t hmp = trans->hmp; 2203 int error; 2204 2205 /* 2206 * Skip records that do not belong to the current flush. 2207 */ 2208 ++hammer_stats_record_iterations; 2209 if (record->flush_state != HAMMER_FST_FLUSH) 2210 return(0); 2211 2212 #if 1 2213 if (record->flush_group != record->ip->flush_group) { 2214 kprintf("sync_record %p ip %p bad flush group %p %p\n", record, record->ip, record->flush_group ,record->ip->flush_group); 2215 Debugger("blah2"); 2216 return(0); 2217 } 2218 #endif 2219 KKASSERT(record->flush_group == record->ip->flush_group); 2220 2221 /* 2222 * Interlock the record using the BE flag. Once BE is set the 2223 * frontend cannot change the state of FE. 2224 * 2225 * NOTE: If FE is set prior to us setting BE we still sync the 2226 * record out, but the flush completion code converts it to 2227 * a delete-on-disk record instead of destroying it. 2228 */ 2229 KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); 2230 record->flags |= HAMMER_RECF_INTERLOCK_BE; 2231 2232 /* 2233 * The backend may have already disposed of the record. 2234 */ 2235 if (record->flags & HAMMER_RECF_DELETED_BE) { 2236 error = 0; 2237 goto done; 2238 } 2239 2240 /* 2241 * If the whole inode is being deleting all on-disk records will 2242 * be deleted very soon, we can't sync any new records to disk 2243 * because they will be deleted in the same transaction they were 2244 * created in (delete_tid == create_tid), which will assert. 2245 * 2246 * XXX There may be a case with RECORD_ADD with DELETED_FE set 2247 * that we currently panic on. 2248 */ 2249 if (record->ip->sync_flags & HAMMER_INODE_DELETING) { 2250 switch(record->type) { 2251 case HAMMER_MEM_RECORD_DATA: 2252 /* 2253 * We don't have to do anything, if the record was 2254 * committed the space will have been accounted for 2255 * in the blockmap. 2256 */ 2257 /* fall through */ 2258 case HAMMER_MEM_RECORD_GENERAL: 2259 record->flags |= HAMMER_RECF_DELETED_FE; 2260 record->flags |= HAMMER_RECF_DELETED_BE; 2261 error = 0; 2262 goto done; 2263 case HAMMER_MEM_RECORD_ADD: 2264 panic("hammer_sync_record_callback: illegal add " 2265 "during inode deletion record %p", record); 2266 break; /* NOT REACHED */ 2267 case HAMMER_MEM_RECORD_INODE: 2268 panic("hammer_sync_record_callback: attempt to " 2269 "sync inode record %p?", record); 2270 break; /* NOT REACHED */ 2271 case HAMMER_MEM_RECORD_DEL: 2272 /* 2273 * Follow through and issue the on-disk deletion 2274 */ 2275 break; 2276 } 2277 } 2278 2279 /* 2280 * If DELETED_FE is set special handling is needed for directory 2281 * entries. Dependant pieces related to the directory entry may 2282 * have already been synced to disk. If this occurs we have to 2283 * sync the directory entry and then change the in-memory record 2284 * from an ADD to a DELETE to cover the fact that it's been 2285 * deleted by the frontend. 2286 * 2287 * A directory delete covering record (MEM_RECORD_DEL) can never 2288 * be deleted by the frontend. 2289 * 2290 * Any other record type (aka DATA) can be deleted by the frontend. 2291 * XXX At the moment the flusher must skip it because there may 2292 * be another data record in the flush group for the same block, 2293 * meaning that some frontend data changes can leak into the backend's 2294 * synchronization point. 2295 */ 2296 if (record->flags & HAMMER_RECF_DELETED_FE) { 2297 if (record->type == HAMMER_MEM_RECORD_ADD) { 2298 record->flags |= HAMMER_RECF_CONVERT_DELETE; 2299 } else { 2300 KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); 2301 record->flags |= HAMMER_RECF_DELETED_BE; 2302 error = 0; 2303 goto done; 2304 } 2305 } 2306 2307 /* 2308 * Assign the create_tid for new records. Deletions already 2309 * have the record's entire key properly set up. 2310 */ 2311 if (record->type != HAMMER_MEM_RECORD_DEL) 2312 record->leaf.base.create_tid = trans->tid; 2313 record->leaf.create_ts = trans->time32; 2314 for (;;) { 2315 error = hammer_ip_sync_record_cursor(cursor, record); 2316 if (error != EDEADLK) 2317 break; 2318 hammer_done_cursor(cursor); 2319 error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], 2320 record->ip); 2321 if (error) 2322 break; 2323 } 2324 record->flags &= ~HAMMER_RECF_CONVERT_DELETE; 2325 2326 if (error) 2327 error = -error; 2328 done: 2329 hammer_flush_record_done(record, error); 2330 2331 /* 2332 * Do partial finalization if we have built up too many dirty 2333 * buffers. Otherwise a buffer cache deadlock can occur when 2334 * doing things like creating tens of thousands of tiny files. 2335 * 2336 * We must release our cursor lock to avoid a 3-way deadlock 2337 * due to the exclusive sync lock the finalizer must get. 2338 */ 2339 if (hammer_flusher_meta_limit(hmp)) { 2340 hammer_unlock_cursor(cursor); 2341 hammer_flusher_finalize(trans, 0); 2342 hammer_lock_cursor(cursor); 2343 } 2344 2345 return(error); 2346 } 2347 2348 /* 2349 * Backend function called by the flusher to sync an inode to media. 2350 */ 2351 int 2352 hammer_sync_inode(hammer_transaction_t trans, hammer_inode_t ip) 2353 { 2354 struct hammer_cursor cursor; 2355 hammer_node_t tmp_node; 2356 hammer_record_t depend; 2357 hammer_record_t next; 2358 int error, tmp_error; 2359 u_int64_t nlinks; 2360 2361 if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) 2362 return(0); 2363 2364 error = hammer_init_cursor(trans, &cursor, &ip->cache[1], ip); 2365 if (error) 2366 goto done; 2367 2368 /* 2369 * Any directory records referencing this inode which are not in 2370 * our current flush group must adjust our nlink count for the 2371 * purposes of synchronization to disk. 2372 * 2373 * Records which are in our flush group can be unlinked from our 2374 * inode now, potentially allowing the inode to be physically 2375 * deleted. 2376 * 2377 * This cannot block. 2378 */ 2379 nlinks = ip->ino_data.nlinks; 2380 next = TAILQ_FIRST(&ip->target_list); 2381 while ((depend = next) != NULL) { 2382 next = TAILQ_NEXT(depend, target_entry); 2383 if (depend->flush_state == HAMMER_FST_FLUSH && 2384 depend->flush_group == ip->flush_group) { 2385 /* 2386 * If this is an ADD that was deleted by the frontend 2387 * the frontend nlinks count will have already been 2388 * decremented, but the backend is going to sync its 2389 * directory entry and must account for it. The 2390 * record will be converted to a delete-on-disk when 2391 * it gets synced. 2392 * 2393 * If the ADD was not deleted by the frontend we 2394 * can remove the dependancy from our target_list. 2395 */ 2396 if (depend->flags & HAMMER_RECF_DELETED_FE) { 2397 ++nlinks; 2398 } else { 2399 TAILQ_REMOVE(&ip->target_list, depend, 2400 target_entry); 2401 depend->target_ip = NULL; 2402 } 2403 } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { 2404 /* 2405 * Not part of our flush group 2406 */ 2407 KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); 2408 switch(depend->type) { 2409 case HAMMER_MEM_RECORD_ADD: 2410 --nlinks; 2411 break; 2412 case HAMMER_MEM_RECORD_DEL: 2413 ++nlinks; 2414 break; 2415 default: 2416 break; 2417 } 2418 } 2419 } 2420 2421 /* 2422 * Set dirty if we had to modify the link count. 2423 */ 2424 if (ip->sync_ino_data.nlinks != nlinks) { 2425 KKASSERT((int64_t)nlinks >= 0); 2426 ip->sync_ino_data.nlinks = nlinks; 2427 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2428 } 2429 2430 /* 2431 * If there is a trunction queued destroy any data past the (aligned) 2432 * truncation point. Userland will have dealt with the buffer 2433 * containing the truncation point for us. 2434 * 2435 * We don't flush pending frontend data buffers until after we've 2436 * dealt with the truncation. 2437 */ 2438 if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { 2439 /* 2440 * Interlock trunc_off. The VOP front-end may continue to 2441 * make adjustments to it while we are blocked. 2442 */ 2443 off_t trunc_off; 2444 off_t aligned_trunc_off; 2445 int blkmask; 2446 2447 trunc_off = ip->sync_trunc_off; 2448 blkmask = hammer_blocksize(trunc_off) - 1; 2449 aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; 2450 2451 /* 2452 * Delete any whole blocks on-media. The front-end has 2453 * already cleaned out any partial block and made it 2454 * pending. The front-end may have updated trunc_off 2455 * while we were blocked so we only use sync_trunc_off. 2456 * 2457 * This operation can blow out the buffer cache, EWOULDBLOCK 2458 * means we were unable to complete the deletion. The 2459 * deletion will update sync_trunc_off in that case. 2460 */ 2461 error = hammer_ip_delete_range(&cursor, ip, 2462 aligned_trunc_off, 2463 0x7FFFFFFFFFFFFFFFLL, 2); 2464 if (error == EWOULDBLOCK) { 2465 ip->flags |= HAMMER_INODE_WOULDBLOCK; 2466 error = 0; 2467 goto defer_buffer_flush; 2468 } 2469 2470 if (error) 2471 goto done; 2472 2473 /* 2474 * Clear the truncation flag on the backend after we have 2475 * complete the deletions. Backend data is now good again 2476 * (including new records we are about to sync, below). 2477 * 2478 * Leave sync_trunc_off intact. As we write additional 2479 * records the backend will update sync_trunc_off. This 2480 * tells the backend whether it can skip the overwrite 2481 * test. This should work properly even when the backend 2482 * writes full blocks where the truncation point straddles 2483 * the block because the comparison is against the base 2484 * offset of the record. 2485 */ 2486 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2487 /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ 2488 } else { 2489 error = 0; 2490 } 2491 2492 /* 2493 * Now sync related records. These will typically be directory 2494 * entries, records tracking direct-writes, or delete-on-disk records. 2495 */ 2496 if (error == 0) { 2497 tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, 2498 hammer_sync_record_callback, &cursor); 2499 if (tmp_error < 0) 2500 tmp_error = -error; 2501 if (tmp_error) 2502 error = tmp_error; 2503 } 2504 hammer_cache_node(&ip->cache[1], cursor.node); 2505 2506 /* 2507 * Re-seek for inode update, assuming our cache hasn't been ripped 2508 * out from under us. 2509 */ 2510 if (error == 0) { 2511 tmp_node = hammer_ref_node_safe(ip->hmp, &ip->cache[0], &error); 2512 if (tmp_node) { 2513 hammer_cursor_downgrade(&cursor); 2514 hammer_lock_sh(&tmp_node->lock); 2515 if ((tmp_node->flags & HAMMER_NODE_DELETED) == 0) 2516 hammer_cursor_seek(&cursor, tmp_node, 0); 2517 hammer_unlock(&tmp_node->lock); 2518 hammer_rel_node(tmp_node); 2519 } 2520 error = 0; 2521 } 2522 2523 /* 2524 * If we are deleting the inode the frontend had better not have 2525 * any active references on elements making up the inode. 2526 * 2527 * The call to hammer_ip_delete_clean() cleans up auxillary records 2528 * but not DB or DATA records. Those must have already been deleted 2529 * by the normal truncation mechanic. 2530 */ 2531 if (error == 0 && ip->sync_ino_data.nlinks == 0 && 2532 RB_EMPTY(&ip->rec_tree) && 2533 (ip->sync_flags & HAMMER_INODE_DELETING) && 2534 (ip->flags & HAMMER_INODE_DELETED) == 0) { 2535 int count1 = 0; 2536 2537 error = hammer_ip_delete_clean(&cursor, ip, &count1); 2538 if (error == 0) { 2539 ip->flags |= HAMMER_INODE_DELETED; 2540 ip->sync_flags &= ~HAMMER_INODE_DELETING; 2541 ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; 2542 KKASSERT(RB_EMPTY(&ip->rec_tree)); 2543 2544 /* 2545 * Set delete_tid in both the frontend and backend 2546 * copy of the inode record. The DELETED flag handles 2547 * this, do not set RDIRTY. 2548 */ 2549 ip->ino_leaf.base.delete_tid = trans->tid; 2550 ip->sync_ino_leaf.base.delete_tid = trans->tid; 2551 ip->ino_leaf.delete_ts = trans->time32; 2552 ip->sync_ino_leaf.delete_ts = trans->time32; 2553 2554 2555 /* 2556 * Adjust the inode count in the volume header 2557 */ 2558 hammer_sync_lock_sh(trans); 2559 if (ip->flags & HAMMER_INODE_ONDISK) { 2560 hammer_modify_volume_field(trans, 2561 trans->rootvol, 2562 vol0_stat_inodes); 2563 --ip->hmp->rootvol->ondisk->vol0_stat_inodes; 2564 hammer_modify_volume_done(trans->rootvol); 2565 } 2566 hammer_sync_unlock(trans); 2567 } 2568 } 2569 2570 if (error) 2571 goto done; 2572 ip->sync_flags &= ~HAMMER_INODE_BUFS; 2573 2574 defer_buffer_flush: 2575 /* 2576 * Now update the inode's on-disk inode-data and/or on-disk record. 2577 * DELETED and ONDISK are managed only in ip->flags. 2578 * 2579 * In the case of a defered buffer flush we still update the on-disk 2580 * inode to satisfy visibility requirements if there happen to be 2581 * directory dependancies. 2582 */ 2583 switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { 2584 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: 2585 /* 2586 * If deleted and on-disk, don't set any additional flags. 2587 * the delete flag takes care of things. 2588 * 2589 * Clear flags which may have been set by the frontend. 2590 */ 2591 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2592 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2593 HAMMER_INODE_DELETING); 2594 break; 2595 case HAMMER_INODE_DELETED: 2596 /* 2597 * Take care of the case where a deleted inode was never 2598 * flushed to the disk in the first place. 2599 * 2600 * Clear flags which may have been set by the frontend. 2601 */ 2602 ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | HAMMER_INODE_XDIRTY | 2603 HAMMER_INODE_ATIME | HAMMER_INODE_MTIME | 2604 HAMMER_INODE_DELETING); 2605 while (RB_ROOT(&ip->rec_tree)) { 2606 hammer_record_t record = RB_ROOT(&ip->rec_tree); 2607 hammer_ref(&record->lock); 2608 KKASSERT(record->lock.refs == 1); 2609 record->flags |= HAMMER_RECF_DELETED_FE; 2610 record->flags |= HAMMER_RECF_DELETED_BE; 2611 hammer_rel_mem_record(record); 2612 } 2613 break; 2614 case HAMMER_INODE_ONDISK: 2615 /* 2616 * If already on-disk, do not set any additional flags. 2617 */ 2618 break; 2619 default: 2620 /* 2621 * If not on-disk and not deleted, set DDIRTY to force 2622 * an initial record to be written. 2623 * 2624 * Also set the create_tid in both the frontend and backend 2625 * copy of the inode record. 2626 */ 2627 ip->ino_leaf.base.create_tid = trans->tid; 2628 ip->ino_leaf.create_ts = trans->time32; 2629 ip->sync_ino_leaf.base.create_tid = trans->tid; 2630 ip->sync_ino_leaf.create_ts = trans->time32; 2631 ip->sync_flags |= HAMMER_INODE_DDIRTY; 2632 break; 2633 } 2634 2635 /* 2636 * If RDIRTY or DDIRTY is set, write out a new record. If the inode 2637 * is already on-disk the old record is marked as deleted. 2638 * 2639 * If DELETED is set hammer_update_inode() will delete the existing 2640 * record without writing out a new one. 2641 * 2642 * If *ONLY* the ITIMES flag is set we can update the record in-place. 2643 */ 2644 if (ip->flags & HAMMER_INODE_DELETED) { 2645 error = hammer_update_inode(&cursor, ip); 2646 } else 2647 if ((ip->sync_flags & HAMMER_INODE_DDIRTY) == 0 && 2648 (ip->sync_flags & (HAMMER_INODE_ATIME | HAMMER_INODE_MTIME))) { 2649 error = hammer_update_itimes(&cursor, ip); 2650 } else 2651 if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) { 2652 error = hammer_update_inode(&cursor, ip); 2653 } 2654 done: 2655 if (error) { 2656 hammer_critical_error(ip->hmp, ip, error, 2657 "while syncing inode"); 2658 } 2659 hammer_done_cursor(&cursor); 2660 return(error); 2661 } 2662 2663 /* 2664 * This routine is called when the OS is no longer actively referencing 2665 * the inode (but might still be keeping it cached), or when releasing 2666 * the last reference to an inode. 2667 * 2668 * At this point if the inode's nlinks count is zero we want to destroy 2669 * it, which may mean destroying it on-media too. 2670 */ 2671 void 2672 hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) 2673 { 2674 struct vnode *vp; 2675 2676 /* 2677 * Set the DELETING flag when the link count drops to 0 and the 2678 * OS no longer has any opens on the inode. 2679 * 2680 * The backend will clear DELETING (a mod flag) and set DELETED 2681 * (a state flag) when it is actually able to perform the 2682 * operation. 2683 * 2684 * Don't reflag the deletion if the flusher is currently syncing 2685 * one that was already flagged. A previously set DELETING flag 2686 * may bounce around flags and sync_flags until the operation is 2687 * completely done. 2688 */ 2689 if (ip->ino_data.nlinks == 0 && 2690 ((ip->flags | ip->sync_flags) & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { 2691 ip->flags |= HAMMER_INODE_DELETING; 2692 ip->flags |= HAMMER_INODE_TRUNCATED; 2693 ip->trunc_off = 0; 2694 vp = NULL; 2695 if (getvp) { 2696 if (hammer_get_vnode(ip, &vp) != 0) 2697 return; 2698 } 2699 2700 /* 2701 * Final cleanup 2702 */ 2703 if (ip->vp) { 2704 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); 2705 vnode_pager_setsize(ip->vp, 0); 2706 } 2707 if (getvp) { 2708 vput(vp); 2709 } 2710 } 2711 } 2712 2713 /* 2714 * After potentially resolving a dependancy the inode is tested 2715 * to determine whether it needs to be reflushed. 2716 */ 2717 void 2718 hammer_test_inode(hammer_inode_t ip) 2719 { 2720 if (ip->flags & HAMMER_INODE_REFLUSH) { 2721 ip->flags &= ~HAMMER_INODE_REFLUSH; 2722 hammer_ref(&ip->lock); 2723 if (ip->flags & HAMMER_INODE_RESIGNAL) { 2724 ip->flags &= ~HAMMER_INODE_RESIGNAL; 2725 hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); 2726 } else { 2727 hammer_flush_inode(ip, 0); 2728 } 2729 hammer_rel_inode(ip, 0); 2730 } 2731 } 2732 2733 /* 2734 * Clear the RECLAIM flag on an inode. This occurs when the inode is 2735 * reassociated with a vp or just before it gets freed. 2736 * 2737 * Pipeline wakeups to threads blocked due to an excessive number of 2738 * detached inodes. The reclaim count generates a bit of negative 2739 * feedback. 2740 */ 2741 static void 2742 hammer_inode_wakereclaims(hammer_inode_t ip, int dowake) 2743 { 2744 struct hammer_reclaim *reclaim; 2745 hammer_mount_t hmp = ip->hmp; 2746 2747 if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) 2748 return; 2749 2750 --hammer_count_reclaiming; 2751 --hmp->inode_reclaims; 2752 ip->flags &= ~HAMMER_INODE_RECLAIM; 2753 2754 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT || dowake) { 2755 reclaim = TAILQ_FIRST(&hmp->reclaim_list); 2756 if (reclaim && reclaim->count > 0 && --reclaim->count == 0) { 2757 TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); 2758 wakeup(reclaim); 2759 } 2760 } 2761 } 2762 2763 /* 2764 * Setup our reclaim pipeline. We only let so many detached (and dirty) 2765 * inodes build up before we start blocking. 2766 * 2767 * When we block we don't care *which* inode has finished reclaiming, 2768 * as lone as one does. This is somewhat heuristical... we also put a 2769 * cap on how long we are willing to wait. 2770 */ 2771 void 2772 hammer_inode_waitreclaims(hammer_mount_t hmp) 2773 { 2774 struct hammer_reclaim reclaim; 2775 int delay; 2776 2777 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT) 2778 return; 2779 delay = (hmp->inode_reclaims - HAMMER_RECLAIM_WAIT) * hz / 2780 (HAMMER_RECLAIM_WAIT * 3) + 1; 2781 if (delay > 0) { 2782 reclaim.count = 2; 2783 TAILQ_INSERT_TAIL(&hmp->reclaim_list, &reclaim, entry); 2784 tsleep(&reclaim, 0, "hmrrcm", delay); 2785 if (reclaim.count > 0) 2786 TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); 2787 } 2788 } 2789 2790 /* 2791 * A larger then normal backlog of inodes is sitting in the flusher, 2792 * enforce a general slowdown to let it catch up. This routine is only 2793 * called on completion of a non-flusher-related transaction which 2794 * performed B-Tree node I/O. 2795 * 2796 * It is possible for the flusher to stall in a continuous load. 2797 * blogbench -i1000 -o seems to do a good job generating this sort of load. 2798 * If the flusher is unable to catch up the inode count can bloat until 2799 * we run out of kvm. 2800 * 2801 * This is a bit of a hack. 2802 */ 2803 void 2804 hammer_inode_waithard(hammer_mount_t hmp) 2805 { 2806 /* 2807 * Hysteresis. 2808 */ 2809 if (hmp->flags & HAMMER_MOUNT_FLUSH_RECOVERY) { 2810 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT / 2 && 2811 hmp->count_iqueued < hmp->count_inodes / 20) { 2812 hmp->flags &= ~HAMMER_MOUNT_FLUSH_RECOVERY; 2813 return; 2814 } 2815 } else { 2816 if (hmp->inode_reclaims < HAMMER_RECLAIM_WAIT || 2817 hmp->count_iqueued < hmp->count_inodes / 10) { 2818 return; 2819 } 2820 hmp->flags |= HAMMER_MOUNT_FLUSH_RECOVERY; 2821 } 2822 2823 /* 2824 * Block for one flush cycle. 2825 */ 2826 hammer_flusher_wait_next(hmp); 2827 } 2828 2829