1 /* 2 * Copyright (c) 2011-2015 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 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression) 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/nlookup.h> 39 #include <sys/vnode.h> 40 #include <sys/mount.h> 41 #include <sys/fcntl.h> 42 #include <sys/buf.h> 43 #include <sys/uuid.h> 44 #include <sys/vfsops.h> 45 #include <sys/sysctl.h> 46 #include <sys/socket.h> 47 #include <sys/objcache.h> 48 49 #include <sys/proc.h> 50 #include <sys/namei.h> 51 #include <sys/mountctl.h> 52 #include <sys/dirent.h> 53 #include <sys/uio.h> 54 55 #include <sys/mutex.h> 56 #include <sys/mutex2.h> 57 58 #include "hammer2.h" 59 #include "hammer2_disk.h" 60 #include "hammer2_mount.h" 61 #include "hammer2_lz4.h" 62 63 #include "zlib/hammer2_zlib.h" 64 65 #define REPORT_REFS_ERRORS 1 /* XXX remove me */ 66 67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache"); 68 69 struct hammer2_sync_info { 70 int error; 71 int waitfor; 72 }; 73 74 TAILQ_HEAD(hammer2_mntlist, hammer2_dev); 75 TAILQ_HEAD(hammer2_pfslist, hammer2_pfs); 76 static struct hammer2_mntlist hammer2_mntlist; 77 static struct hammer2_pfslist hammer2_pfslist; 78 static struct lock hammer2_mntlk; 79 80 int hammer2_debug; 81 int hammer2_cluster_read = 4; /* physical read-ahead */ 82 int hammer2_cluster_write = 0; /* bdwrite() so later inval works */ 83 int hammer2_dedup_enable = 1; 84 int hammer2_inval_enable = 0; 85 int hammer2_flush_pipe = 100; 86 int hammer2_synchronous_flush = 1; 87 int hammer2_dio_count; 88 long hammer2_chain_allocs; 89 long hammer2_chain_frees; 90 long hammer2_limit_dirty_chains; 91 long hammer2_count_modified_chains; 92 long hammer2_iod_invals; 93 long hammer2_iod_file_read; 94 long hammer2_iod_meta_read; 95 long hammer2_iod_indr_read; 96 long hammer2_iod_fmap_read; 97 long hammer2_iod_volu_read; 98 long hammer2_iod_file_write; 99 long hammer2_iod_file_wembed; 100 long hammer2_iod_file_wzero; 101 long hammer2_iod_file_wdedup; 102 long hammer2_iod_meta_write; 103 long hammer2_iod_indr_write; 104 long hammer2_iod_fmap_write; 105 long hammer2_iod_volu_write; 106 107 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 108 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 109 "Buffer used for compression."); 110 111 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 112 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 113 "Buffer used for decompression."); 114 115 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 116 117 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 118 &hammer2_debug, 0, ""); 119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_read, CTLFLAG_RW, 120 &hammer2_cluster_read, 0, ""); 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW, 122 &hammer2_cluster_write, 0, ""); 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 124 &hammer2_dedup_enable, 0, ""); 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW, 126 &hammer2_inval_enable, 0, ""); 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 128 &hammer2_flush_pipe, 0, ""); 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW, 130 &hammer2_synchronous_flush, 0, ""); 131 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW, 132 &hammer2_chain_allocs, 0, ""); 133 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW, 134 &hammer2_chain_frees, 0, ""); 135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 136 &hammer2_limit_dirty_chains, 0, ""); 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW, 138 &hammer2_count_modified_chains, 0, ""); 139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 140 &hammer2_dio_count, 0, ""); 141 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW, 143 &hammer2_iod_invals, 0, ""); 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 145 &hammer2_iod_file_read, 0, ""); 146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 147 &hammer2_iod_meta_read, 0, ""); 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 149 &hammer2_iod_indr_read, 0, ""); 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 151 &hammer2_iod_fmap_read, 0, ""); 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 153 &hammer2_iod_volu_read, 0, ""); 154 155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 156 &hammer2_iod_file_write, 0, ""); 157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW, 158 &hammer2_iod_file_wembed, 0, ""); 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW, 160 &hammer2_iod_file_wzero, 0, ""); 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW, 162 &hammer2_iod_file_wdedup, 0, ""); 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 164 &hammer2_iod_meta_write, 0, ""); 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 166 &hammer2_iod_indr_write, 0, ""); 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 168 &hammer2_iod_fmap_write, 0, ""); 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 170 &hammer2_iod_volu_write, 0, ""); 171 172 long hammer2_check_icrc32; 173 long hammer2_check_xxhash64; 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW, 175 &hammer2_check_icrc32, 0, ""); 176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW, 177 &hammer2_check_xxhash64, 0, ""); 178 179 static int hammer2_vfs_init(struct vfsconf *conf); 180 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 181 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 182 struct ucred *cred); 183 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 184 struct vnode *, struct ucred *); 185 static int hammer2_recovery(hammer2_dev_t *hmp); 186 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 187 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 188 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 189 struct ucred *cred); 190 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 191 struct ucred *cred); 192 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 193 struct fid *fhp, struct vnode **vpp); 194 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 195 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 196 int *exflagsp, struct ucred **credanonp); 197 198 static int hammer2_install_volume_header(hammer2_dev_t *hmp); 199 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 200 201 static void hammer2_update_pmps(hammer2_dev_t *hmp); 202 203 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 204 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 205 hammer2_dev_t *hmp); 206 207 /* 208 * HAMMER2 vfs operations. 209 */ 210 static struct vfsops hammer2_vfsops = { 211 .vfs_init = hammer2_vfs_init, 212 .vfs_uninit = hammer2_vfs_uninit, 213 .vfs_sync = hammer2_vfs_sync, 214 .vfs_mount = hammer2_vfs_mount, 215 .vfs_unmount = hammer2_vfs_unmount, 216 .vfs_root = hammer2_vfs_root, 217 .vfs_statfs = hammer2_vfs_statfs, 218 .vfs_statvfs = hammer2_vfs_statvfs, 219 .vfs_vget = hammer2_vfs_vget, 220 .vfs_vptofh = hammer2_vfs_vptofh, 221 .vfs_fhtovp = hammer2_vfs_fhtovp, 222 .vfs_checkexp = hammer2_vfs_checkexp 223 }; 224 225 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 226 227 VFS_SET(hammer2_vfsops, hammer2, 0); 228 MODULE_VERSION(hammer2, 1); 229 230 static 231 int 232 hammer2_vfs_init(struct vfsconf *conf) 233 { 234 static struct objcache_malloc_args margs_read; 235 static struct objcache_malloc_args margs_write; 236 static struct objcache_malloc_args margs_vop; 237 238 int error; 239 240 error = 0; 241 242 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 243 error = EINVAL; 244 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 245 error = EINVAL; 246 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 247 error = EINVAL; 248 249 if (error) 250 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 251 252 margs_read.objsize = 65536; 253 margs_read.mtype = M_HAMMER2_DEBUFFER; 254 255 margs_write.objsize = 32768; 256 margs_write.mtype = M_HAMMER2_CBUFFER; 257 258 margs_vop.objsize = sizeof(hammer2_xop_t); 259 margs_vop.mtype = M_HAMMER2; 260 261 /* 262 * Note thaht for the XOPS cache we want backing store allocations 263 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 264 * confusion), so use the backing store function that does it. This 265 * means that initial XOPS objects are zerod but REUSED objects are 266 * not. So we are responsible for cleaning the object up sufficiently 267 * for our needs before objcache_put()ing it back (typically just the 268 * FIFO indices). 269 */ 270 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 271 0, 1, NULL, NULL, NULL, 272 objcache_malloc_alloc, 273 objcache_malloc_free, 274 &margs_read); 275 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 276 0, 1, NULL, NULL, NULL, 277 objcache_malloc_alloc, 278 objcache_malloc_free, 279 &margs_write); 280 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 281 0, 1, NULL, NULL, NULL, 282 objcache_malloc_alloc_zero, 283 objcache_malloc_free, 284 &margs_vop); 285 286 287 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 288 TAILQ_INIT(&hammer2_mntlist); 289 TAILQ_INIT(&hammer2_pfslist); 290 291 hammer2_limit_dirty_chains = maxvnodes / 10; 292 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 293 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 294 295 return (error); 296 } 297 298 static 299 int 300 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 301 { 302 objcache_destroy(cache_buffer_read); 303 objcache_destroy(cache_buffer_write); 304 objcache_destroy(cache_xops); 305 return 0; 306 } 307 308 /* 309 * Core PFS allocator. Used to allocate the pmp structure for PFS cluster 310 * mounts and the spmp structure for media (hmp) structures. 311 * 312 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 313 * transactions. Note that synchronization does not use this field. 314 * (typically frontend operations and synchronization cannot run on the 315 * same PFS node at the same time). 316 * 317 * XXX check locking 318 */ 319 hammer2_pfs_t * 320 hammer2_pfsalloc(hammer2_chain_t *chain, const hammer2_inode_data_t *ripdata, 321 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 322 { 323 hammer2_inode_t *iroot; 324 hammer2_pfs_t *pmp; 325 int count; 326 int i; 327 int j; 328 329 /* 330 * Locate or create the PFS based on the cluster id. If ripdata 331 * is NULL this is a spmp which is unique and is always allocated. 332 * 333 * If the device is mounted in local mode all PFSs are considered 334 * independent and not part of any cluster (for debugging only). 335 */ 336 if (ripdata) { 337 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 338 if (force_local != pmp->force_local) 339 continue; 340 if (force_local == NULL && 341 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 342 sizeof(pmp->pfs_clid)) == 0) { 343 break; 344 } else if (force_local && pmp->pfs_names[0] && 345 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 346 break; 347 } 348 } 349 } else { 350 pmp = NULL; 351 } 352 353 if (pmp == NULL) { 354 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 355 pmp->force_local = force_local; 356 hammer2_trans_manage_init(pmp); 357 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 358 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 359 lockinit(&pmp->lock, "pfslk", 0, 0); 360 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 361 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 362 spin_init(&pmp->xop_spin, "h2xop"); 363 spin_init(&pmp->lru_spin, "h2lru"); 364 RB_INIT(&pmp->inum_tree); 365 TAILQ_INIT(&pmp->sideq); 366 TAILQ_INIT(&pmp->lru_list); 367 spin_init(&pmp->list_spin, "hm2pfsalloc_list"); 368 369 /* 370 * Distribute backend operations to threads 371 */ 372 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 373 for (j = 0; j < HAMMER2_XOPGROUPS + 374 HAMMER2_SPECTHREADS; ++j) { 375 TAILQ_INIT(&pmp->xopq[i][j]); 376 } 377 } 378 for (i = 0; i < HAMMER2_XOPGROUPS; ++i) 379 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]); 380 381 /* 382 * Save the last media transaction id for the flusher. Set 383 * initial 384 */ 385 if (ripdata) 386 pmp->pfs_clid = ripdata->meta.pfs_clid; 387 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 388 389 /* 390 * The synchronization thread may start too early, make 391 * sure it stays frozen until we are ready to let it go. 392 * XXX 393 */ 394 /* 395 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 396 HAMMER2_THREAD_REMASTER; 397 */ 398 } 399 400 /* 401 * Create the PFS's root inode. 402 */ 403 if ((iroot = pmp->iroot) == NULL) { 404 iroot = hammer2_inode_get(pmp, NULL, NULL, -1); 405 pmp->iroot = iroot; 406 hammer2_inode_ref(iroot); 407 hammer2_inode_unlock(iroot); 408 } 409 410 /* 411 * Stop here if no chain is passed in. 412 */ 413 if (chain == NULL) 414 goto done; 415 416 /* 417 * When a chain is passed in we must add it to the PFS's root 418 * inode, update pmp->pfs_types[], and update the syncronization 419 * threads. 420 * 421 * When forcing local mode, mark the PFS as a MASTER regardless. 422 * 423 * At the moment empty spots can develop due to removals or failures. 424 * Ultimately we want to re-fill these spots but doing so might 425 * confused running code. XXX 426 */ 427 hammer2_inode_ref(iroot); 428 hammer2_mtx_ex(&iroot->lock); 429 j = iroot->cluster.nchains; 430 431 kprintf("add PFS to pmp %p[%d]\n", pmp, j); 432 433 if (j == HAMMER2_MAXCLUSTER) { 434 kprintf("hammer2_mount: cluster full!\n"); 435 /* XXX fatal error? */ 436 } else { 437 KKASSERT(chain->pmp == NULL); 438 chain->pmp = pmp; 439 hammer2_chain_ref(chain); 440 iroot->cluster.array[j].chain = chain; 441 if (force_local) 442 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 443 else 444 pmp->pfs_types[j] = ripdata->meta.pfs_type; 445 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 446 pmp->pfs_hmps[j] = chain->hmp; 447 448 /* 449 * If the PFS is already mounted we must account 450 * for the mount_count here. 451 */ 452 if (pmp->mp) 453 ++chain->hmp->mount_count; 454 455 /* 456 * May have to fixup dirty chain tracking. Previous 457 * pmp was NULL so nothing to undo. 458 */ 459 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 460 hammer2_pfs_memory_inc(pmp); 461 ++j; 462 } 463 iroot->cluster.nchains = j; 464 465 /* 466 * Update nmasters from any PFS inode which is part of the cluster. 467 * It is possible that this will result in a value which is too 468 * high. MASTER PFSs are authoritative for pfs_nmasters and will 469 * override this value later on. 470 * 471 * (This informs us of masters that might not currently be 472 * discoverable by this mount). 473 */ 474 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 475 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 476 } 477 478 /* 479 * Count visible masters. Masters are usually added with 480 * ripdata->meta.pfs_nmasters set to 1. This detects when there 481 * are more (XXX and must update the master inodes). 482 */ 483 count = 0; 484 for (i = 0; i < iroot->cluster.nchains; ++i) { 485 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 486 ++count; 487 } 488 if (pmp->pfs_nmasters < count) 489 pmp->pfs_nmasters = count; 490 491 /* 492 * Create missing synchronization and support threads. 493 * 494 * Single-node masters (including snapshots) have nothing to 495 * synchronize and do not require this thread. 496 * 497 * Multi-node masters or any number of soft masters, slaves, copy, 498 * or other PFS types need the thread. 499 * 500 * Each thread is responsible for its particular cluster index. 501 * We use independent threads so stalls or mismatches related to 502 * any given target do not affect other targets. 503 */ 504 for (i = 0; i < iroot->cluster.nchains; ++i) { 505 /* 506 * Single-node masters (including snapshots) have nothing 507 * to synchronize and will make direct xops support calls, 508 * thus they do not require this thread. 509 * 510 * Note that there can be thousands of snapshots. We do not 511 * want to create thousands of threads. 512 */ 513 if (pmp->pfs_nmasters <= 1 && 514 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 515 continue; 516 } 517 518 /* 519 * Sync support thread 520 */ 521 if (pmp->sync_thrs[i].td == NULL) { 522 hammer2_thr_create(&pmp->sync_thrs[i], pmp, 523 "h2nod", i, -1, 524 hammer2_primary_sync_thread); 525 } 526 } 527 528 /* 529 * Create missing Xop threads 530 */ 531 if (pmp->mp) 532 hammer2_xop_helper_create(pmp); 533 534 hammer2_mtx_unlock(&iroot->lock); 535 hammer2_inode_drop(iroot); 536 done: 537 return pmp; 538 } 539 540 /* 541 * Destroy a PFS, typically only occurs after the last mount on a device 542 * has gone away. 543 */ 544 static void 545 hammer2_pfsfree(hammer2_pfs_t *pmp) 546 { 547 hammer2_inode_t *iroot; 548 hammer2_chain_t *chain; 549 int i; 550 int j; 551 552 /* 553 * Cleanup our reference on iroot. iroot is (should) not be needed 554 * by the flush code. 555 */ 556 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 557 558 iroot = pmp->iroot; 559 if (iroot) { 560 for (i = 0; i < iroot->cluster.nchains; ++i) { 561 hammer2_thr_delete(&pmp->sync_thrs[i]); 562 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 563 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 564 } 565 #if REPORT_REFS_ERRORS 566 if (pmp->iroot->refs != 1) 567 kprintf("PMP->IROOT %p REFS WRONG %d\n", 568 pmp->iroot, pmp->iroot->refs); 569 #else 570 KKASSERT(pmp->iroot->refs == 1); 571 #endif 572 /* ref for pmp->iroot */ 573 hammer2_inode_drop(pmp->iroot); 574 pmp->iroot = NULL; 575 } 576 577 /* 578 * Cleanup chains remaining on LRU list. 579 */ 580 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count); 581 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 582 hammer2_chain_ref(chain); 583 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 584 hammer2_chain_drop(chain); 585 } 586 587 /* 588 * Free remaining pmp resources 589 */ 590 kmalloc_destroy(&pmp->mmsg); 591 kmalloc_destroy(&pmp->minode); 592 593 kfree(pmp, M_HAMMER2); 594 } 595 596 /* 597 * Remove all references to hmp from the pfs list. Any PFS which becomes 598 * empty is terminated and freed. 599 * 600 * XXX inefficient. 601 */ 602 static void 603 hammer2_pfsfree_scan(hammer2_dev_t *hmp) 604 { 605 hammer2_pfs_t *pmp; 606 hammer2_inode_t *iroot; 607 hammer2_chain_t *rchain; 608 int didfreeze; 609 int i; 610 int j; 611 612 again: 613 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 614 if ((iroot = pmp->iroot) == NULL) 615 continue; 616 if (hmp->spmp == pmp) { 617 kprintf("unmount hmp %p remove spmp %p\n", 618 hmp, pmp); 619 hmp->spmp = NULL; 620 } 621 622 /* 623 * Determine if this PFS is affected. If it is we must 624 * freeze all management threads and lock its iroot. 625 * 626 * Freezing a management thread forces it idle, operations 627 * in-progress will be aborted and it will have to start 628 * over again when unfrozen, or exit if told to exit. 629 */ 630 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 631 if (pmp->pfs_hmps[i] == hmp) 632 break; 633 } 634 if (i != HAMMER2_MAXCLUSTER) { 635 /* 636 * Make sure all synchronization threads are locked 637 * down. 638 */ 639 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 640 if (pmp->pfs_hmps[i] == NULL) 641 continue; 642 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 643 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 644 hammer2_thr_freeze_async( 645 &pmp->xop_groups[j].thrs[i]); 646 } 647 } 648 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 649 if (pmp->pfs_hmps[i] == NULL) 650 continue; 651 hammer2_thr_freeze(&pmp->sync_thrs[i]); 652 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 653 hammer2_thr_freeze( 654 &pmp->xop_groups[j].thrs[i]); 655 } 656 } 657 658 /* 659 * Lock the inode and clean out matching chains. 660 * Note that we cannot use hammer2_inode_lock_*() 661 * here because that would attempt to validate the 662 * cluster that we are in the middle of ripping 663 * apart. 664 * 665 * WARNING! We are working directly on the inodes 666 * embedded cluster. 667 */ 668 hammer2_mtx_ex(&iroot->lock); 669 670 /* 671 * Remove the chain from matching elements of the PFS. 672 */ 673 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 674 if (pmp->pfs_hmps[i] != hmp) 675 continue; 676 hammer2_thr_delete(&pmp->sync_thrs[i]); 677 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 678 hammer2_thr_delete( 679 &pmp->xop_groups[j].thrs[i]); 680 } 681 rchain = iroot->cluster.array[i].chain; 682 iroot->cluster.array[i].chain = NULL; 683 pmp->pfs_types[i] = 0; 684 if (pmp->pfs_names[i]) { 685 kfree(pmp->pfs_names[i], M_HAMMER2); 686 pmp->pfs_names[i] = NULL; 687 } 688 if (rchain) { 689 hammer2_chain_drop(rchain); 690 /* focus hint */ 691 if (iroot->cluster.focus == rchain) 692 iroot->cluster.focus = NULL; 693 } 694 pmp->pfs_hmps[i] = NULL; 695 } 696 hammer2_mtx_unlock(&iroot->lock); 697 didfreeze = 1; /* remaster, unfreeze down below */ 698 } else { 699 didfreeze = 0; 700 } 701 702 /* 703 * Cleanup trailing chains. Gaps may remain. 704 */ 705 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 706 if (pmp->pfs_hmps[i]) 707 break; 708 } 709 iroot->cluster.nchains = i + 1; 710 711 /* 712 * If the PMP has no elements remaining we can destroy it. 713 * (this will transition management threads from frozen->exit). 714 */ 715 if (iroot->cluster.nchains == 0) { 716 kprintf("unmount hmp %p last ref to PMP=%p\n", 717 hmp, pmp); 718 hammer2_pfsfree(pmp); 719 goto again; 720 } 721 722 /* 723 * If elements still remain we need to set the REMASTER 724 * flag and unfreeze it. 725 */ 726 if (didfreeze) { 727 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 728 if (pmp->pfs_hmps[i] == NULL) 729 continue; 730 hammer2_thr_remaster(&pmp->sync_thrs[i]); 731 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 732 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 733 hammer2_thr_remaster( 734 &pmp->xop_groups[j].thrs[i]); 735 hammer2_thr_unfreeze( 736 &pmp->xop_groups[j].thrs[i]); 737 } 738 } 739 } 740 } 741 } 742 743 /* 744 * Mount or remount HAMMER2 fileystem from physical media 745 * 746 * mountroot 747 * mp mount point structure 748 * path NULL 749 * data <unused> 750 * cred <unused> 751 * 752 * mount 753 * mp mount point structure 754 * path path to mount point 755 * data pointer to argument structure in user space 756 * volume volume path (device@LABEL form) 757 * hflags user mount flags 758 * cred user credentials 759 * 760 * RETURNS: 0 Success 761 * !0 error number 762 */ 763 static 764 int 765 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 766 struct ucred *cred) 767 { 768 struct hammer2_mount_info info; 769 hammer2_pfs_t *pmp; 770 hammer2_pfs_t *spmp; 771 hammer2_dev_t *hmp; 772 hammer2_dev_t *force_local; 773 hammer2_key_t key_next; 774 hammer2_key_t key_dummy; 775 hammer2_key_t lhc; 776 struct vnode *devvp; 777 struct nlookupdata nd; 778 hammer2_chain_t *parent; 779 hammer2_chain_t *chain; 780 hammer2_cluster_t *cluster; 781 const hammer2_inode_data_t *ripdata; 782 hammer2_blockref_t bref; 783 struct file *fp; 784 char devstr[MNAMELEN]; 785 size_t size; 786 size_t done; 787 char *dev; 788 char *label; 789 int ronly = 1; 790 int error; 791 int cache_index; 792 int i; 793 794 hmp = NULL; 795 pmp = NULL; 796 dev = NULL; 797 label = NULL; 798 devvp = NULL; 799 cache_index = -1; 800 801 kprintf("hammer2_mount\n"); 802 803 if (path == NULL) { 804 /* 805 * Root mount 806 */ 807 bzero(&info, sizeof(info)); 808 info.cluster_fd = -1; 809 ksnprintf(devstr, sizeof(devstr), "%s", 810 mp->mnt_stat.f_mntfromname); 811 kprintf("hammer2_mount: root '%s'\n", devstr); 812 } else { 813 /* 814 * Non-root mount or updating a mount 815 */ 816 error = copyin(data, &info, sizeof(info)); 817 if (error) 818 return (error); 819 820 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 821 if (error) 822 return (error); 823 } 824 825 /* Extract device and label */ 826 dev = devstr; 827 label = strchr(devstr, '@'); 828 if (label == NULL || 829 ((label + 1) - dev) > done) { 830 return (EINVAL); 831 } 832 *label = '\0'; 833 label++; 834 if (*label == '\0') 835 return (EINVAL); 836 837 if (mp->mnt_flag & MNT_UPDATE) { 838 /* 839 * Update mount. Note that pmp->iroot->cluster is 840 * an inode-embedded cluster and thus cannot be 841 * directly locked. 842 * 843 * XXX HAMMER2 needs to implement NFS export via 844 * mountctl. 845 */ 846 pmp = MPTOPMP(mp); 847 pmp->hflags = info.hflags; 848 cluster = &pmp->iroot->cluster; 849 for (i = 0; i < cluster->nchains; ++i) { 850 if (cluster->array[i].chain == NULL) 851 continue; 852 hmp = cluster->array[i].chain->hmp; 853 devvp = hmp->devvp; 854 error = hammer2_remount(hmp, mp, path, 855 devvp, cred); 856 if (error) 857 break; 858 } 859 860 return error; 861 } 862 863 /* 864 * HMP device mount 865 * 866 * Lookup name and verify it refers to a block device. 867 */ 868 if (path) { 869 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 870 if (error == 0) 871 error = nlookup(&nd); 872 if (error == 0) 873 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 874 nlookup_done(&nd); 875 } else { 876 /* root mount */ 877 cdev_t cdev = kgetdiskbyname(dev); 878 error = bdevvp(cdev, &devvp); 879 if (error) 880 kprintf("hammer2: cannot find '%s'\n", dev); 881 } 882 883 if (error == 0) { 884 if (vn_isdisk(devvp, &error)) 885 error = vfs_mountedon(devvp); 886 } 887 888 /* 889 * Determine if the device has already been mounted. After this 890 * check hmp will be non-NULL if we are doing the second or more 891 * hammer2 mounts from the same device. 892 */ 893 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 894 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 895 if (hmp->devvp == devvp) 896 break; 897 } 898 899 /* 900 * Open the device if this isn't a secondary mount and construct 901 * the H2 device mount (hmp). 902 */ 903 if (hmp == NULL) { 904 hammer2_chain_t *schain; 905 hammer2_xid_t xid; 906 907 if (error == 0 && vcount(devvp) > 0) 908 error = EBUSY; 909 910 /* 911 * Now open the device 912 */ 913 if (error == 0) { 914 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 915 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 916 error = vinvalbuf(devvp, V_SAVE, 0, 0); 917 if (error == 0) { 918 error = VOP_OPEN(devvp, 919 ronly ? FREAD : FREAD | FWRITE, 920 FSCRED, NULL); 921 } 922 vn_unlock(devvp); 923 } 924 if (error && devvp) { 925 vrele(devvp); 926 devvp = NULL; 927 } 928 if (error) { 929 lockmgr(&hammer2_mntlk, LK_RELEASE); 930 return error; 931 } 932 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 933 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 934 hmp->ronly = ronly; 935 hmp->devvp = devvp; 936 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 937 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 938 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 939 RB_INIT(&hmp->iotree); 940 spin_init(&hmp->io_spin, "hm2mount_io"); 941 spin_init(&hmp->list_spin, "hm2mount_list"); 942 TAILQ_INIT(&hmp->flushq); 943 944 lockinit(&hmp->vollk, "h2vol", 0, 0); 945 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 946 947 /* 948 * vchain setup. vchain.data is embedded. 949 * vchain.refs is initialized and will never drop to 0. 950 * 951 * NOTE! voldata is not yet loaded. 952 */ 953 hmp->vchain.hmp = hmp; 954 hmp->vchain.refs = 1; 955 hmp->vchain.data = (void *)&hmp->voldata; 956 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 957 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 958 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 959 960 hammer2_chain_core_init(&hmp->vchain); 961 /* hmp->vchain.u.xxx is left NULL */ 962 963 /* 964 * fchain setup. fchain.data is embedded. 965 * fchain.refs is initialized and will never drop to 0. 966 * 967 * The data is not used but needs to be initialized to 968 * pass assertion muster. We use this chain primarily 969 * as a placeholder for the freemap's top-level RBTREE 970 * so it does not interfere with the volume's topology 971 * RBTREE. 972 */ 973 hmp->fchain.hmp = hmp; 974 hmp->fchain.refs = 1; 975 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 976 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 977 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 978 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 979 hmp->fchain.bref.methods = 980 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 981 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 982 983 hammer2_chain_core_init(&hmp->fchain); 984 /* hmp->fchain.u.xxx is left NULL */ 985 986 /* 987 * Install the volume header and initialize fields from 988 * voldata. 989 */ 990 error = hammer2_install_volume_header(hmp); 991 if (error) { 992 hammer2_unmount_helper(mp, NULL, hmp); 993 lockmgr(&hammer2_mntlk, LK_RELEASE); 994 hammer2_vfs_unmount(mp, MNT_FORCE); 995 return error; 996 } 997 998 /* 999 * Really important to get these right or flush will get 1000 * confused. 1001 */ 1002 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1003 kprintf("alloc spmp %p tid %016jx\n", 1004 hmp->spmp, hmp->voldata.mirror_tid); 1005 spmp = hmp->spmp; 1006 1007 /* 1008 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1009 * is inherited from the volume header. 1010 */ 1011 xid = 0; 1012 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1013 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1014 hmp->vchain.pmp = spmp; 1015 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1016 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1017 hmp->fchain.pmp = spmp; 1018 1019 /* 1020 * First locate the super-root inode, which is key 0 1021 * relative to the volume header's blockset. 1022 * 1023 * Then locate the root inode by scanning the directory keyspace 1024 * represented by the label. 1025 */ 1026 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1027 schain = hammer2_chain_lookup(&parent, &key_dummy, 1028 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1029 &cache_index, 0); 1030 hammer2_chain_lookup_done(parent); 1031 if (schain == NULL) { 1032 kprintf("hammer2_mount: invalid super-root\n"); 1033 hammer2_unmount_helper(mp, NULL, hmp); 1034 lockmgr(&hammer2_mntlk, LK_RELEASE); 1035 hammer2_vfs_unmount(mp, MNT_FORCE); 1036 return EINVAL; 1037 } 1038 if (schain->error) { 1039 kprintf("hammer2_mount: error %s reading super-root\n", 1040 hammer2_error_str(schain->error)); 1041 hammer2_chain_unlock(schain); 1042 hammer2_chain_drop(schain); 1043 schain = NULL; 1044 hammer2_unmount_helper(mp, NULL, hmp); 1045 lockmgr(&hammer2_mntlk, LK_RELEASE); 1046 hammer2_vfs_unmount(mp, MNT_FORCE); 1047 return EINVAL; 1048 } 1049 1050 /* 1051 * The super-root always uses an inode_tid of 1 when 1052 * creating PFSs. 1053 */ 1054 spmp->inode_tid = 1; 1055 spmp->modify_tid = schain->bref.modify_tid + 1; 1056 1057 /* 1058 * Sanity-check schain's pmp and finish initialization. 1059 * Any chain belonging to the super-root topology should 1060 * have a NULL pmp (not even set to spmp). 1061 */ 1062 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1063 KKASSERT(schain->pmp == NULL); 1064 spmp->pfs_clid = ripdata->meta.pfs_clid; 1065 1066 /* 1067 * Replace the dummy spmp->iroot with a real one. It's 1068 * easier to just do a wholesale replacement than to try 1069 * to update the chain and fixup the iroot fields. 1070 * 1071 * The returned inode is locked with the supplied cluster. 1072 */ 1073 cluster = hammer2_cluster_from_chain(schain); 1074 hammer2_inode_drop(spmp->iroot); 1075 spmp->iroot = NULL; 1076 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1077 spmp->spmp_hmp = hmp; 1078 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1079 spmp->pfs_hmps[0] = hmp; 1080 hammer2_inode_ref(spmp->iroot); 1081 hammer2_inode_unlock(spmp->iroot); 1082 hammer2_cluster_unlock(cluster); 1083 hammer2_cluster_drop(cluster); 1084 schain = NULL; 1085 /* leave spmp->iroot with one ref */ 1086 1087 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1088 error = hammer2_recovery(hmp); 1089 /* XXX do something with error */ 1090 } 1091 hammer2_update_pmps(hmp); 1092 hammer2_iocom_init(hmp); 1093 1094 /* 1095 * Ref the cluster management messaging descriptor. The mount 1096 * program deals with the other end of the communications pipe. 1097 * 1098 * Root mounts typically do not supply one. 1099 */ 1100 if (info.cluster_fd >= 0) { 1101 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1102 if (fp) { 1103 hammer2_cluster_reconnect(hmp, fp); 1104 } else { 1105 kprintf("hammer2_mount: bad cluster_fd!\n"); 1106 } 1107 } 1108 } else { 1109 spmp = hmp->spmp; 1110 if (info.hflags & HMNT2_DEVFLAGS) { 1111 kprintf("hammer2: Warning: mount flags pertaining " 1112 "to the whole device may only be specified " 1113 "on the first mount of the device: %08x\n", 1114 info.hflags & HMNT2_DEVFLAGS); 1115 } 1116 } 1117 1118 /* 1119 * Force local mount (disassociate all PFSs from their clusters). 1120 * Used primarily for debugging. 1121 */ 1122 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1123 1124 /* 1125 * Lookup the mount point under the media-localized super-root. 1126 * Scanning hammer2_pfslist doesn't help us because it represents 1127 * PFS cluster ids which can aggregate several named PFSs together. 1128 * 1129 * cluster->pmp will incorrectly point to spmp and must be fixed 1130 * up later on. 1131 */ 1132 hammer2_inode_lock(spmp->iroot, 0); 1133 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1134 lhc = hammer2_dirhash(label, strlen(label)); 1135 chain = hammer2_chain_lookup(&parent, &key_next, 1136 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1137 &cache_index, 0); 1138 while (chain) { 1139 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1140 strcmp(label, chain->data->ipdata.filename) == 0) { 1141 break; 1142 } 1143 chain = hammer2_chain_next(&parent, chain, &key_next, 1144 key_next, 1145 lhc + HAMMER2_DIRHASH_LOMASK, 1146 &cache_index, 0); 1147 } 1148 if (parent) { 1149 hammer2_chain_unlock(parent); 1150 hammer2_chain_drop(parent); 1151 } 1152 hammer2_inode_unlock(spmp->iroot); 1153 1154 /* 1155 * PFS could not be found? 1156 */ 1157 if (chain == NULL) { 1158 kprintf("hammer2_mount: PFS label not found\n"); 1159 hammer2_unmount_helper(mp, NULL, hmp); 1160 lockmgr(&hammer2_mntlk, LK_RELEASE); 1161 hammer2_vfs_unmount(mp, MNT_FORCE); 1162 1163 return EINVAL; 1164 } 1165 1166 /* 1167 * Acquire the pmp structure (it should have already been allocated 1168 * via hammer2_update_pmps() so do not pass cluster in to add to 1169 * available chains). 1170 * 1171 * Check if the cluster has already been mounted. A cluster can 1172 * only be mounted once, use null mounts to mount additional copies. 1173 */ 1174 ripdata = &chain->data->ipdata; 1175 bref = chain->bref; 1176 pmp = hammer2_pfsalloc(NULL, ripdata, bref.modify_tid, force_local); 1177 hammer2_chain_unlock(chain); 1178 hammer2_chain_drop(chain); 1179 1180 if (pmp->mp) { 1181 kprintf("hammer2_mount: PFS already mounted!\n"); 1182 hammer2_unmount_helper(mp, NULL, hmp); 1183 lockmgr(&hammer2_mntlk, LK_RELEASE); 1184 hammer2_vfs_unmount(mp, MNT_FORCE); 1185 1186 return EBUSY; 1187 } 1188 1189 /* 1190 * Finish the mount 1191 */ 1192 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1193 1194 pmp->hflags = info.hflags; 1195 mp->mnt_flag = MNT_LOCAL; 1196 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1197 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1198 1199 /* 1200 * required mount structure initializations 1201 */ 1202 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1203 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1204 1205 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1206 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1207 1208 /* 1209 * Optional fields 1210 */ 1211 mp->mnt_iosize_max = MAXPHYS; 1212 1213 /* 1214 * Connect up mount pointers. 1215 */ 1216 hammer2_mount_helper(mp, pmp); 1217 1218 lockmgr(&hammer2_mntlk, LK_RELEASE); 1219 1220 /* 1221 * Finish setup 1222 */ 1223 vfs_getnewfsid(mp); 1224 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1225 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1226 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1227 1228 if (path) { 1229 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1230 MNAMELEN - 1, &size); 1231 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1232 } /* else root mount, already in there */ 1233 1234 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1235 if (path) { 1236 copyinstr(path, mp->mnt_stat.f_mntonname, 1237 sizeof(mp->mnt_stat.f_mntonname) - 1, 1238 &size); 1239 } else { 1240 /* root mount */ 1241 mp->mnt_stat.f_mntonname[0] = '/'; 1242 } 1243 1244 /* 1245 * Initial statfs to prime mnt_stat. 1246 */ 1247 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1248 1249 return 0; 1250 } 1251 1252 /* 1253 * Scan PFSs under the super-root and create hammer2_pfs structures. 1254 */ 1255 static 1256 void 1257 hammer2_update_pmps(hammer2_dev_t *hmp) 1258 { 1259 const hammer2_inode_data_t *ripdata; 1260 hammer2_chain_t *parent; 1261 hammer2_chain_t *chain; 1262 hammer2_blockref_t bref; 1263 hammer2_dev_t *force_local; 1264 hammer2_pfs_t *spmp; 1265 hammer2_pfs_t *pmp; 1266 hammer2_key_t key_next; 1267 int cache_index = -1; 1268 1269 /* 1270 * Force local mount (disassociate all PFSs from their clusters). 1271 * Used primarily for debugging. 1272 */ 1273 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1274 1275 /* 1276 * Lookup mount point under the media-localized super-root. 1277 * 1278 * cluster->pmp will incorrectly point to spmp and must be fixed 1279 * up later on. 1280 */ 1281 spmp = hmp->spmp; 1282 hammer2_inode_lock(spmp->iroot, 0); 1283 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1284 chain = hammer2_chain_lookup(&parent, &key_next, 1285 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1286 &cache_index, 0); 1287 while (chain) { 1288 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1289 continue; 1290 ripdata = &chain->data->ipdata; 1291 bref = chain->bref; 1292 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename); 1293 1294 pmp = hammer2_pfsalloc(chain, ripdata, 1295 bref.modify_tid, force_local); 1296 chain = hammer2_chain_next(&parent, chain, &key_next, 1297 key_next, HAMMER2_KEY_MAX, 1298 &cache_index, 0); 1299 } 1300 if (parent) { 1301 hammer2_chain_unlock(parent); 1302 hammer2_chain_drop(parent); 1303 } 1304 hammer2_inode_unlock(spmp->iroot); 1305 } 1306 1307 static 1308 int 1309 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1310 struct vnode *devvp, struct ucred *cred) 1311 { 1312 int error; 1313 1314 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1315 error = hammer2_recovery(hmp); 1316 } else { 1317 error = 0; 1318 } 1319 return error; 1320 } 1321 1322 static 1323 int 1324 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1325 { 1326 hammer2_pfs_t *pmp; 1327 int flags; 1328 int error = 0; 1329 1330 pmp = MPTOPMP(mp); 1331 1332 if (pmp == NULL) 1333 return(0); 1334 1335 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1336 1337 /* 1338 * If mount initialization proceeded far enough we must flush 1339 * its vnodes and sync the underlying mount points. Three syncs 1340 * are required to fully flush the filesystem (freemap updates lag 1341 * by one flush, and one extra for safety). 1342 */ 1343 if (mntflags & MNT_FORCE) 1344 flags = FORCECLOSE; 1345 else 1346 flags = 0; 1347 if (pmp->iroot) { 1348 error = vflush(mp, 0, flags); 1349 if (error) 1350 goto failed; 1351 hammer2_vfs_sync(mp, MNT_WAIT); 1352 hammer2_vfs_sync(mp, MNT_WAIT); 1353 hammer2_vfs_sync(mp, MNT_WAIT); 1354 } 1355 1356 /* 1357 * Cleanup the frontend support XOPS threads 1358 */ 1359 hammer2_xop_helper_cleanup(pmp); 1360 1361 if (pmp->mp) 1362 hammer2_unmount_helper(mp, pmp, NULL); 1363 1364 error = 0; 1365 failed: 1366 lockmgr(&hammer2_mntlk, LK_RELEASE); 1367 1368 return (error); 1369 } 1370 1371 /* 1372 * Mount helper, hook the system mount into our PFS. 1373 * The mount lock is held. 1374 * 1375 * We must bump the mount_count on related devices for any 1376 * mounted PFSs. 1377 */ 1378 static 1379 void 1380 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1381 { 1382 hammer2_cluster_t *cluster; 1383 hammer2_chain_t *rchain; 1384 int i; 1385 1386 mp->mnt_data = (qaddr_t)pmp; 1387 pmp->mp = mp; 1388 1389 /* 1390 * After pmp->mp is set we have to adjust hmp->mount_count. 1391 */ 1392 cluster = &pmp->iroot->cluster; 1393 for (i = 0; i < cluster->nchains; ++i) { 1394 rchain = cluster->array[i].chain; 1395 if (rchain == NULL) 1396 continue; 1397 ++rchain->hmp->mount_count; 1398 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1399 rchain->hmp, rchain->hmp->mount_count); 1400 } 1401 1402 /* 1403 * Create missing Xop threads 1404 */ 1405 hammer2_xop_helper_create(pmp); 1406 } 1407 1408 /* 1409 * Mount helper, unhook the system mount from our PFS. 1410 * The mount lock is held. 1411 * 1412 * If hmp is supplied a mount responsible for being the first to open 1413 * the block device failed and the block device and all PFSs using the 1414 * block device must be cleaned up. 1415 * 1416 * If pmp is supplied multiple devices might be backing the PFS and each 1417 * must be disconnected. This might not be the last PFS using some of the 1418 * underlying devices. Also, we have to adjust our hmp->mount_count 1419 * accounting for the devices backing the pmp which is now undergoing an 1420 * unmount. 1421 */ 1422 static 1423 void 1424 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1425 { 1426 hammer2_cluster_t *cluster; 1427 hammer2_chain_t *rchain; 1428 struct vnode *devvp; 1429 int dumpcnt; 1430 int ronly = 0; 1431 int i; 1432 1433 /* 1434 * If no device supplied this is a high-level unmount and we have to 1435 * to disconnect the mount, adjust mount_count, and locate devices 1436 * that might now have no mounts. 1437 */ 1438 if (pmp) { 1439 KKASSERT(hmp == NULL); 1440 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1441 pmp->mp = NULL; 1442 mp->mnt_data = NULL; 1443 1444 /* 1445 * After pmp->mp is cleared we have to account for 1446 * mount_count. 1447 */ 1448 cluster = &pmp->iroot->cluster; 1449 for (i = 0; i < cluster->nchains; ++i) { 1450 rchain = cluster->array[i].chain; 1451 if (rchain == NULL) 1452 continue; 1453 --rchain->hmp->mount_count; 1454 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n", 1455 rchain->hmp, rchain->hmp->mount_count); 1456 /* scrapping hmp now may invalidate the pmp */ 1457 } 1458 again: 1459 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1460 if (hmp->mount_count == 0) { 1461 hammer2_unmount_helper(NULL, NULL, hmp); 1462 goto again; 1463 } 1464 } 1465 return; 1466 } 1467 1468 /* 1469 * Try to terminate the block device. We can't terminate it if 1470 * there are still PFSs referencing it. 1471 */ 1472 kprintf("hammer2_unmount hmp=%p mount_count=%d\n", 1473 hmp, hmp->mount_count); 1474 if (hmp->mount_count) 1475 return; 1476 1477 hammer2_pfsfree_scan(hmp); 1478 hammer2_dev_exlock(hmp); /* XXX order */ 1479 1480 /* 1481 * Cycle the volume data lock as a safety (probably not needed any 1482 * more). To ensure everything is out we need to flush at least 1483 * three times. (1) The running of the sideq can dirty the 1484 * filesystem, (2) A normal flush can dirty the freemap, and 1485 * (3) ensure that the freemap is fully synchronized. 1486 * 1487 * The next mount's recovery scan can clean everything up but we want 1488 * to leave the filesystem in a 100% clean state on a normal unmount. 1489 */ 1490 #if 0 1491 hammer2_voldata_lock(hmp); 1492 hammer2_voldata_unlock(hmp); 1493 #endif 1494 hammer2_iocom_uninit(hmp); 1495 1496 if ((hmp->vchain.flags | hmp->fchain.flags) & 1497 HAMMER2_CHAIN_FLUSH_MASK) { 1498 kprintf("hammer2_unmount: chains left over " 1499 "after final sync\n"); 1500 kprintf(" vchain %08x\n", hmp->vchain.flags); 1501 kprintf(" fchain %08x\n", hmp->fchain.flags); 1502 1503 if (hammer2_debug & 0x0010) 1504 Debugger("entered debugger"); 1505 } 1506 1507 KKASSERT(hmp->spmp == NULL); 1508 1509 /* 1510 * Finish up with the device vnode 1511 */ 1512 if ((devvp = hmp->devvp) != NULL) { 1513 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1514 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1515 hmp->devvp = NULL; 1516 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1517 vn_unlock(devvp); 1518 vrele(devvp); 1519 devvp = NULL; 1520 } 1521 1522 /* 1523 * Clear vchain/fchain flags that might prevent final cleanup 1524 * of these chains. 1525 */ 1526 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1527 atomic_add_long(&hammer2_count_modified_chains, -1); 1528 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1529 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1530 } 1531 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1532 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1533 } 1534 1535 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1536 atomic_add_long(&hammer2_count_modified_chains, -1); 1537 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1538 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1539 } 1540 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1541 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1542 } 1543 1544 /* 1545 * Final drop of embedded freemap root chain to 1546 * clean up fchain.core (fchain structure is not 1547 * flagged ALLOCATED so it is cleaned out and then 1548 * left to rot). 1549 */ 1550 hammer2_chain_drop(&hmp->fchain); 1551 1552 /* 1553 * Final drop of embedded volume root chain to clean 1554 * up vchain.core (vchain structure is not flagged 1555 * ALLOCATED so it is cleaned out and then left to 1556 * rot). 1557 */ 1558 dumpcnt = 50; 1559 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1560 dumpcnt = 50; 1561 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1562 hammer2_dev_unlock(hmp); 1563 hammer2_chain_drop(&hmp->vchain); 1564 1565 hammer2_io_cleanup(hmp, &hmp->iotree); 1566 if (hmp->iofree_count) { 1567 kprintf("io_cleanup: %d I/O's left hanging\n", 1568 hmp->iofree_count); 1569 } 1570 1571 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1572 kmalloc_destroy(&hmp->mchain); 1573 kfree(hmp, M_HAMMER2); 1574 } 1575 1576 int 1577 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1578 ino_t ino, struct vnode **vpp) 1579 { 1580 hammer2_xop_lookup_t *xop; 1581 hammer2_pfs_t *pmp; 1582 hammer2_inode_t *ip; 1583 hammer2_tid_t inum; 1584 int error; 1585 1586 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1587 1588 error = 0; 1589 pmp = MPTOPMP(mp); 1590 1591 /* 1592 * Easy if we already have it cached 1593 */ 1594 ip = hammer2_inode_lookup(pmp, inum); 1595 if (ip) { 1596 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1597 *vpp = hammer2_igetv(ip, &error); 1598 hammer2_inode_unlock(ip); 1599 hammer2_inode_drop(ip); /* from lookup */ 1600 1601 return error; 1602 } 1603 1604 /* 1605 * Otherwise we have to find the inode 1606 */ 1607 xop = hammer2_xop_alloc(pmp->iroot, 0); 1608 xop->lhc = inum; 1609 hammer2_xop_start(&xop->head, hammer2_xop_lookup); 1610 error = hammer2_xop_collect(&xop->head, 0); 1611 1612 if (error == 0) { 1613 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) { 1614 kprintf("vget: no collect error but also no rdata\n"); 1615 kprintf("xop %p\n", xop); 1616 while ((hammer2_debug & 0x80000) == 0) { 1617 tsleep(xop, PCATCH, "wait", hz * 10); 1618 } 1619 ip = NULL; 1620 } else { 1621 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1); 1622 } 1623 } 1624 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1625 1626 if (ip) { 1627 *vpp = hammer2_igetv(ip, &error); 1628 hammer2_inode_unlock(ip); 1629 } else { 1630 *vpp = NULL; 1631 error = ENOENT; 1632 } 1633 return (error); 1634 } 1635 1636 static 1637 int 1638 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1639 { 1640 hammer2_pfs_t *pmp; 1641 struct vnode *vp; 1642 int error; 1643 1644 pmp = MPTOPMP(mp); 1645 if (pmp->iroot == NULL) { 1646 *vpp = NULL; 1647 return EINVAL; 1648 } 1649 1650 error = 0; 1651 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1652 1653 while (pmp->inode_tid == 0) { 1654 hammer2_xop_ipcluster_t *xop; 1655 hammer2_inode_meta_t *meta; 1656 1657 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1658 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1659 error = hammer2_xop_collect(&xop->head, 0); 1660 1661 if (error == 0) { 1662 meta = &xop->head.cluster.focus->data->ipdata.meta; 1663 pmp->iroot->meta = *meta; 1664 pmp->inode_tid = meta->pfs_inum + 1; 1665 if (pmp->inode_tid < HAMMER2_INODE_START) 1666 pmp->inode_tid = HAMMER2_INODE_START; 1667 pmp->modify_tid = 1668 xop->head.cluster.focus->bref.modify_tid + 1; 1669 kprintf("PFS: Starting inode %jd\n", 1670 (intmax_t)pmp->inode_tid); 1671 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1672 pmp->inode_tid, pmp->modify_tid); 1673 wakeup(&pmp->iroot); 1674 1675 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1676 1677 /* 1678 * Prime the mount info. 1679 */ 1680 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1681 break; 1682 } 1683 1684 /* 1685 * Loop, try again 1686 */ 1687 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1688 hammer2_inode_unlock(pmp->iroot); 1689 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1690 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1691 if (error == EINTR) 1692 break; 1693 } 1694 1695 if (error) { 1696 hammer2_inode_unlock(pmp->iroot); 1697 *vpp = NULL; 1698 } else { 1699 vp = hammer2_igetv(pmp->iroot, &error); 1700 hammer2_inode_unlock(pmp->iroot); 1701 *vpp = vp; 1702 } 1703 1704 return (error); 1705 } 1706 1707 /* 1708 * Filesystem status 1709 * 1710 * XXX incorporate ipdata->meta.inode_quota and data_quota 1711 */ 1712 static 1713 int 1714 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1715 { 1716 hammer2_pfs_t *pmp; 1717 hammer2_dev_t *hmp; 1718 hammer2_blockref_t bref; 1719 int i; 1720 1721 /* 1722 * NOTE: iroot might not have validated the cluster yet. 1723 */ 1724 pmp = MPTOPMP(mp); 1725 1726 mp->mnt_stat.f_files = 0; 1727 mp->mnt_stat.f_ffree = 0; 1728 mp->mnt_stat.f_blocks = 0; 1729 mp->mnt_stat.f_bfree = 0; 1730 mp->mnt_stat.f_bavail = 0; 1731 1732 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1733 hmp = pmp->pfs_hmps[i]; 1734 if (hmp == NULL) 1735 continue; 1736 if (pmp->iroot->cluster.array[i].chain) 1737 bref = pmp->iroot->cluster.array[i].chain->bref; 1738 else 1739 bzero(&bref, sizeof(bref)); 1740 1741 mp->mnt_stat.f_files = bref.inode_count; 1742 mp->mnt_stat.f_ffree = 0; 1743 #if 0 1744 mp->mnt_stat.f_blocks = (bref.data_count + 1745 hmp->voldata.allocator_free) / 1746 mp->mnt_vstat.f_bsize; 1747 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1748 mp->mnt_vstat.f_bsize; 1749 #endif 1750 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / 1751 mp->mnt_vstat.f_bsize; 1752 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1753 mp->mnt_vstat.f_bsize; 1754 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1755 1756 *sbp = mp->mnt_stat; 1757 } 1758 return (0); 1759 } 1760 1761 static 1762 int 1763 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1764 { 1765 hammer2_pfs_t *pmp; 1766 hammer2_dev_t *hmp; 1767 hammer2_blockref_t bref; 1768 int i; 1769 1770 /* 1771 * NOTE: iroot might not have validated the cluster yet. 1772 */ 1773 pmp = MPTOPMP(mp); 1774 1775 mp->mnt_vstat.f_bsize = 0; 1776 mp->mnt_vstat.f_files = 0; 1777 mp->mnt_vstat.f_ffree = 0; 1778 mp->mnt_vstat.f_blocks = 0; 1779 mp->mnt_vstat.f_bfree = 0; 1780 mp->mnt_vstat.f_bavail = 0; 1781 1782 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1783 hmp = pmp->pfs_hmps[i]; 1784 if (hmp == NULL) 1785 continue; 1786 if (pmp->iroot->cluster.array[i].chain) 1787 bref = pmp->iroot->cluster.array[i].chain->bref; 1788 else 1789 bzero(&bref, sizeof(bref)); 1790 1791 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1792 mp->mnt_vstat.f_files = bref.inode_count; 1793 mp->mnt_vstat.f_ffree = 0; 1794 #if 0 1795 mp->mnt_vstat.f_blocks = (bref.data_count + 1796 hmp->voldata.allocator_free) / 1797 mp->mnt_vstat.f_bsize; 1798 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1799 mp->mnt_vstat.f_bsize; 1800 #endif 1801 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / 1802 mp->mnt_vstat.f_bsize; 1803 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1804 mp->mnt_vstat.f_bsize; 1805 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1806 1807 *sbp = mp->mnt_vstat; 1808 } 1809 return (0); 1810 } 1811 1812 /* 1813 * Mount-time recovery (RW mounts) 1814 * 1815 * Updates to the free block table are allowed to lag flushes by one 1816 * transaction. In case of a crash, then on a fresh mount we must do an 1817 * incremental scan of the last committed transaction id and make sure that 1818 * all related blocks have been marked allocated. 1819 * 1820 * The super-root topology and each PFS has its own transaction id domain, 1821 * so we must track PFS boundary transitions. 1822 */ 1823 struct hammer2_recovery_elm { 1824 TAILQ_ENTRY(hammer2_recovery_elm) entry; 1825 hammer2_chain_t *chain; 1826 hammer2_tid_t sync_tid; 1827 }; 1828 1829 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 1830 1831 struct hammer2_recovery_info { 1832 struct hammer2_recovery_list list; 1833 hammer2_tid_t mtid; 1834 int depth; 1835 }; 1836 1837 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 1838 hammer2_chain_t *parent, 1839 struct hammer2_recovery_info *info, 1840 hammer2_tid_t sync_tid); 1841 1842 #define HAMMER2_RECOVERY_MAXDEPTH 10 1843 1844 static 1845 int 1846 hammer2_recovery(hammer2_dev_t *hmp) 1847 { 1848 struct hammer2_recovery_info info; 1849 struct hammer2_recovery_elm *elm; 1850 hammer2_chain_t *parent; 1851 hammer2_tid_t sync_tid; 1852 hammer2_tid_t mirror_tid; 1853 int error; 1854 int cumulative_error = 0; 1855 1856 hammer2_trans_init(hmp->spmp, 0); 1857 1858 sync_tid = hmp->voldata.freemap_tid; 1859 mirror_tid = hmp->voldata.mirror_tid; 1860 1861 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 1862 if (sync_tid >= mirror_tid) { 1863 kprintf(" no recovery needed\n"); 1864 } else { 1865 kprintf(" freemap recovery %016jx-%016jx\n", 1866 sync_tid + 1, mirror_tid); 1867 } 1868 1869 TAILQ_INIT(&info.list); 1870 info.depth = 0; 1871 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1872 cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 1873 hammer2_chain_lookup_done(parent); 1874 1875 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 1876 TAILQ_REMOVE(&info.list, elm, entry); 1877 parent = elm->chain; 1878 sync_tid = elm->sync_tid; 1879 kfree(elm, M_HAMMER2); 1880 1881 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1882 error = hammer2_recovery_scan(hmp, parent, &info, 1883 hmp->voldata.freemap_tid); 1884 hammer2_chain_unlock(parent); 1885 hammer2_chain_drop(parent); /* drop elm->chain ref */ 1886 if (error) 1887 cumulative_error = error; 1888 } 1889 hammer2_trans_done(hmp->spmp); 1890 1891 return cumulative_error; 1892 } 1893 1894 static 1895 int 1896 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 1897 struct hammer2_recovery_info *info, 1898 hammer2_tid_t sync_tid) 1899 { 1900 const hammer2_inode_data_t *ripdata; 1901 hammer2_chain_t *chain; 1902 hammer2_blockref_t bref; 1903 int cache_index; 1904 int cumulative_error = 0; 1905 int error; 1906 int first; 1907 1908 /* 1909 * Adjust freemap to ensure that the block(s) are marked allocated. 1910 */ 1911 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 1912 hammer2_freemap_adjust(hmp, &parent->bref, 1913 HAMMER2_FREEMAP_DORECOVER); 1914 } 1915 1916 /* 1917 * Check type for recursive scan 1918 */ 1919 switch(parent->bref.type) { 1920 case HAMMER2_BREF_TYPE_VOLUME: 1921 /* data already instantiated */ 1922 break; 1923 case HAMMER2_BREF_TYPE_INODE: 1924 /* 1925 * Must instantiate data for DIRECTDATA test and also 1926 * for recursion. 1927 */ 1928 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1929 ripdata = &hammer2_chain_rdata(parent)->ipdata; 1930 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 1931 /* not applicable to recovery scan */ 1932 hammer2_chain_unlock(parent); 1933 return 0; 1934 } 1935 hammer2_chain_unlock(parent); 1936 break; 1937 case HAMMER2_BREF_TYPE_INDIRECT: 1938 /* 1939 * Must instantiate data for recursion 1940 */ 1941 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1942 hammer2_chain_unlock(parent); 1943 break; 1944 case HAMMER2_BREF_TYPE_DATA: 1945 case HAMMER2_BREF_TYPE_FREEMAP: 1946 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 1947 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 1948 /* not applicable to recovery scan */ 1949 return 0; 1950 break; 1951 default: 1952 return EDOM; 1953 } 1954 1955 /* 1956 * Defer operation if depth limit reached or if we are crossing a 1957 * PFS boundary. 1958 */ 1959 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 1960 struct hammer2_recovery_elm *elm; 1961 1962 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 1963 elm->chain = parent; 1964 elm->sync_tid = sync_tid; 1965 hammer2_chain_ref(parent); 1966 TAILQ_INSERT_TAIL(&info->list, elm, entry); 1967 /* unlocked by caller */ 1968 1969 return(0); 1970 } 1971 1972 1973 /* 1974 * Recursive scan of the last flushed transaction only. We are 1975 * doing this without pmp assignments so don't leave the chains 1976 * hanging around after we are done with them. 1977 */ 1978 cache_index = 0; 1979 chain = NULL; 1980 first = 1; 1981 1982 while (hammer2_chain_scan(parent, &chain, &bref, 1983 &first, &cache_index, 1984 HAMMER2_LOOKUP_NODATA) != NULL) { 1985 /* 1986 * If this is a leaf 1987 */ 1988 if (chain == NULL) { 1989 if (bref.mirror_tid > sync_tid) { 1990 hammer2_freemap_adjust(hmp, &bref, 1991 HAMMER2_FREEMAP_DORECOVER); 1992 } 1993 continue; 1994 } 1995 1996 /* 1997 * This may or may not be a recursive node. 1998 */ 1999 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2000 if (bref.mirror_tid > sync_tid) { 2001 ++info->depth; 2002 error = hammer2_recovery_scan(hmp, chain, 2003 info, sync_tid); 2004 --info->depth; 2005 if (error) 2006 cumulative_error = error; 2007 } 2008 2009 /* 2010 * Flush the recovery at the PFS boundary to stage it for 2011 * the final flush of the super-root topology. 2012 */ 2013 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2014 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2015 hammer2_flush(chain, HAMMER2_FLUSH_TOP); 2016 } 2017 } 2018 2019 return cumulative_error; 2020 } 2021 2022 /* 2023 * Sync a mount point; this is called on a per-mount basis from the 2024 * filesystem syncer process periodically and whenever a user issues 2025 * a sync. 2026 */ 2027 int 2028 hammer2_vfs_sync(struct mount *mp, int waitfor) 2029 { 2030 hammer2_xop_flush_t *xop; 2031 struct hammer2_sync_info info; 2032 hammer2_inode_t *iroot; 2033 hammer2_pfs_t *pmp; 2034 int flags; 2035 int error; 2036 2037 pmp = MPTOPMP(mp); 2038 iroot = pmp->iroot; 2039 KKASSERT(iroot); 2040 KKASSERT(iroot->pmp == pmp); 2041 2042 /* 2043 * We can't acquire locks on existing vnodes while in a transaction 2044 * without risking a deadlock. This assumes that vfsync() can be 2045 * called without the vnode locked (which it can in DragonFly). 2046 * Otherwise we'd have to implement a multi-pass or flag the lock 2047 * failures and retry. 2048 * 2049 * The reclamation code interlocks with the sync list's token 2050 * (by removing the vnode from the scan list) before unlocking 2051 * the inode, giving us time to ref the inode. 2052 */ 2053 /*flags = VMSC_GETVP;*/ 2054 flags = 0; 2055 if (waitfor & MNT_LAZY) 2056 flags |= VMSC_ONEPASS; 2057 2058 #if 1 2059 /* 2060 * Preflush the vnodes using a normal transaction before interlocking 2061 * with a flush transaction. We do this to try to run as much of 2062 * the compression as possible outside the flush transaction. 2063 */ 2064 hammer2_trans_init(pmp, 0); 2065 info.error = 0; 2066 info.waitfor = MNT_NOWAIT; 2067 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2068 hammer2_trans_done(pmp); 2069 #endif 2070 2071 /* 2072 * Start our flush transaction. This does not return until all 2073 * concurrent transactions have completed and will prevent any 2074 * new transactions from running concurrently, except for the 2075 * buffer cache transactions. 2076 * 2077 * For efficiency do an async pass before making sure with a 2078 * synchronous pass on all related buffer cache buffers. It 2079 * should theoretically not be possible for any new file buffers 2080 * to be instantiated during this sequence. 2081 */ 2082 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH | 2083 HAMMER2_TRANS_PREFLUSH); 2084 hammer2_inode_run_sideq(pmp); 2085 2086 info.error = 0; 2087 info.waitfor = MNT_NOWAIT; 2088 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2089 info.waitfor = MNT_WAIT; 2090 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2091 2092 /* 2093 * Clear PREFLUSH. This prevents (or asserts on) any new logical 2094 * buffer cache flushes which occur during the flush. Device buffers 2095 * are not affected. 2096 */ 2097 hammer2_bioq_sync(pmp); 2098 hammer2_trans_clear_preflush(pmp); 2099 2100 /* 2101 * Use the XOP interface to concurrently flush all nodes to 2102 * synchronize the PFSROOT subtopology to the media. A standard 2103 * end-of-scan ENOENT error indicates cluster sufficiency. 2104 * 2105 * Note that this flush will not be visible on crash recovery until 2106 * we flush the super-root topology in the next loop. 2107 * 2108 * XXX For now wait for all flushes to complete. 2109 */ 2110 if (iroot) { 2111 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 2112 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 2113 error = hammer2_xop_collect(&xop->head, 2114 HAMMER2_XOP_COLLECT_WAITALL); 2115 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2116 if (error == ENOENT) 2117 error = 0; 2118 } else { 2119 error = 0; 2120 } 2121 hammer2_trans_done(pmp); 2122 2123 return (error); 2124 } 2125 2126 /* 2127 * Sync passes. 2128 * 2129 * Note that we ignore the tranasction mtid we got above. Instead, 2130 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 2131 * transactions. 2132 */ 2133 static int 2134 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 2135 { 2136 struct hammer2_sync_info *info = data; 2137 hammer2_inode_t *ip; 2138 int error; 2139 2140 /* 2141 * Degenerate cases. Note that ip == NULL typically means the 2142 * syncer vnode itself and we don't want to vclrisdirty() in that 2143 * situation. 2144 */ 2145 ip = VTOI(vp); 2146 if (ip == NULL) { 2147 return(0); 2148 } 2149 if (vp->v_type == VNON || vp->v_type == VBAD) { 2150 vclrisdirty(vp); 2151 return(0); 2152 } 2153 2154 /* 2155 * VOP_FSYNC will start a new transaction so replicate some code 2156 * here to do it inline (see hammer2_vop_fsync()). 2157 * 2158 * WARNING: The vfsync interacts with the buffer cache and might 2159 * block, we can't hold the inode lock at that time. 2160 * However, we MUST ref ip before blocking to ensure that 2161 * it isn't ripped out from under us (since we do not 2162 * hold a lock on the vnode). 2163 */ 2164 hammer2_inode_ref(ip); 2165 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2166 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2167 vfsync(vp, info->waitfor, 1, NULL, NULL); 2168 if (ip->flags & (HAMMER2_INODE_RESIZED | 2169 HAMMER2_INODE_MODIFIED)) { 2170 hammer2_inode_lock(ip, 0); 2171 hammer2_inode_chain_sync(ip); 2172 hammer2_inode_unlock(ip); 2173 } 2174 } 2175 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2176 RB_EMPTY(&vp->v_rbdirty_tree)) { 2177 vclrisdirty(vp); 2178 } 2179 2180 hammer2_inode_drop(ip); 2181 #if 1 2182 error = 0; 2183 if (error) 2184 info->error = error; 2185 #endif 2186 return(0); 2187 } 2188 2189 static 2190 int 2191 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2192 { 2193 hammer2_inode_t *ip; 2194 2195 KKASSERT(MAXFIDSZ >= 16); 2196 ip = VTOI(vp); 2197 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2198 fhp->fid_ext = 0; 2199 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2200 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2201 2202 return 0; 2203 } 2204 2205 static 2206 int 2207 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2208 struct fid *fhp, struct vnode **vpp) 2209 { 2210 hammer2_pfs_t *pmp; 2211 hammer2_tid_t inum; 2212 int error; 2213 2214 pmp = MPTOPMP(mp); 2215 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2216 if (vpp) { 2217 if (inum == 1) 2218 error = hammer2_vfs_root(mp, vpp); 2219 else 2220 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2221 } else { 2222 error = 0; 2223 } 2224 if (error) 2225 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2226 return error; 2227 } 2228 2229 static 2230 int 2231 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2232 int *exflagsp, struct ucred **credanonp) 2233 { 2234 hammer2_pfs_t *pmp; 2235 struct netcred *np; 2236 int error; 2237 2238 pmp = MPTOPMP(mp); 2239 np = vfs_export_lookup(mp, &pmp->export, nam); 2240 if (np) { 2241 *exflagsp = np->netc_exflags; 2242 *credanonp = &np->netc_anon; 2243 error = 0; 2244 } else { 2245 error = EACCES; 2246 } 2247 return error; 2248 } 2249 2250 /* 2251 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2252 * header into the HMP 2253 * 2254 * XXX read four volhdrs and use the one with the highest TID whos CRC 2255 * matches. 2256 * 2257 * XXX check iCRCs. 2258 * 2259 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2260 * nonexistant locations. 2261 * 2262 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2263 */ 2264 static 2265 int 2266 hammer2_install_volume_header(hammer2_dev_t *hmp) 2267 { 2268 hammer2_volume_data_t *vd; 2269 struct buf *bp; 2270 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2271 int error_reported; 2272 int error; 2273 int valid; 2274 int i; 2275 2276 error_reported = 0; 2277 error = 0; 2278 valid = 0; 2279 bp = NULL; 2280 2281 /* 2282 * There are up to 4 copies of the volume header (syncs iterate 2283 * between them so there is no single master). We don't trust the 2284 * volu_size field so we don't know precisely how large the filesystem 2285 * is, so depend on the OS to return an error if we go beyond the 2286 * block device's EOF. 2287 */ 2288 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2289 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2290 HAMMER2_VOLUME_BYTES, &bp); 2291 if (error) { 2292 brelse(bp); 2293 bp = NULL; 2294 continue; 2295 } 2296 2297 vd = (struct hammer2_volume_data *) bp->b_data; 2298 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2299 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2300 brelse(bp); 2301 bp = NULL; 2302 continue; 2303 } 2304 2305 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2306 /* XXX: Reversed-endianness filesystem */ 2307 kprintf("hammer2: reverse-endian filesystem detected"); 2308 brelse(bp); 2309 bp = NULL; 2310 continue; 2311 } 2312 2313 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2314 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2315 HAMMER2_VOLUME_ICRC0_SIZE); 2316 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2317 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2318 HAMMER2_VOLUME_ICRC1_SIZE); 2319 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2320 kprintf("hammer2 volume header crc " 2321 "mismatch copy #%d %08x/%08x\n", 2322 i, crc0, crc); 2323 error_reported = 1; 2324 brelse(bp); 2325 bp = NULL; 2326 continue; 2327 } 2328 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2329 valid = 1; 2330 hmp->voldata = *vd; 2331 hmp->volhdrno = i; 2332 } 2333 brelse(bp); 2334 bp = NULL; 2335 } 2336 if (valid) { 2337 hmp->volsync = hmp->voldata; 2338 error = 0; 2339 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2340 kprintf("hammer2: using volume header #%d\n", 2341 hmp->volhdrno); 2342 } 2343 } else { 2344 error = EINVAL; 2345 kprintf("hammer2: no valid volume headers found!\n"); 2346 } 2347 return (error); 2348 } 2349 2350 /* 2351 * This handles hysteresis on regular file flushes. Because the BIOs are 2352 * routed to a thread it is possible for an excessive number to build up 2353 * and cause long front-end stalls long before the runningbuffspace limit 2354 * is hit, so we implement hammer2_flush_pipe to control the 2355 * hysteresis. 2356 * 2357 * This is a particular problem when compression is used. 2358 */ 2359 void 2360 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2361 { 2362 atomic_add_int(&pmp->count_lwinprog, 1); 2363 } 2364 2365 void 2366 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2367 { 2368 int lwinprog; 2369 2370 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2371 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2372 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2373 atomic_clear_int(&pmp->count_lwinprog, 2374 HAMMER2_LWINPROG_WAITING); 2375 wakeup(&pmp->count_lwinprog); 2376 } 2377 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2378 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2379 atomic_clear_int(&pmp->count_lwinprog, 2380 HAMMER2_LWINPROG_WAITING0); 2381 wakeup(&pmp->count_lwinprog); 2382 } 2383 } 2384 2385 void 2386 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2387 { 2388 int lwinprog; 2389 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2390 HAMMER2_LWINPROG_WAITING0; 2391 2392 for (;;) { 2393 lwinprog = pmp->count_lwinprog; 2394 cpu_ccfence(); 2395 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2396 break; 2397 tsleep_interlock(&pmp->count_lwinprog, 0); 2398 atomic_set_int(&pmp->count_lwinprog, lwflag); 2399 lwinprog = pmp->count_lwinprog; 2400 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2401 break; 2402 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2403 } 2404 } 2405 2406 /* 2407 * Manage excessive memory resource use for chain and related 2408 * structures. 2409 */ 2410 void 2411 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2412 { 2413 uint32_t waiting; 2414 uint32_t count; 2415 uint32_t limit; 2416 #if 0 2417 static int zzticks; 2418 #endif 2419 2420 /* 2421 * Atomic check condition and wait. Also do an early speedup of 2422 * the syncer to try to avoid hitting the wait. 2423 */ 2424 for (;;) { 2425 waiting = pmp->inmem_dirty_chains; 2426 cpu_ccfence(); 2427 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2428 2429 limit = pmp->mp->mnt_nvnodelistsize / 10; 2430 if (limit < hammer2_limit_dirty_chains) 2431 limit = hammer2_limit_dirty_chains; 2432 if (limit < 1000) 2433 limit = 1000; 2434 2435 #if 0 2436 if ((int)(ticks - zzticks) > hz) { 2437 zzticks = ticks; 2438 kprintf("count %ld %ld\n", count, limit); 2439 } 2440 #endif 2441 2442 /* 2443 * Block if there are too many dirty chains present, wait 2444 * for the flush to clean some out. 2445 */ 2446 if (count > limit) { 2447 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2448 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2449 waiting, 2450 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2451 speedup_syncer(pmp->mp); 2452 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2453 "chnmem", hz); 2454 } 2455 continue; /* loop on success or fail */ 2456 } 2457 2458 /* 2459 * Try to start an early flush before we are forced to block. 2460 */ 2461 if (count > limit * 7 / 10) 2462 speedup_syncer(pmp->mp); 2463 break; 2464 } 2465 } 2466 2467 void 2468 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2469 { 2470 if (pmp) { 2471 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2472 } 2473 } 2474 2475 void 2476 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2477 { 2478 uint32_t waiting; 2479 2480 if (pmp == NULL) 2481 return; 2482 2483 for (;;) { 2484 waiting = pmp->inmem_dirty_chains; 2485 cpu_ccfence(); 2486 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2487 waiting, 2488 (waiting - 1) & 2489 ~HAMMER2_DIRTYCHAIN_WAITING)) { 2490 break; 2491 } 2492 } 2493 2494 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) 2495 wakeup(&pmp->inmem_dirty_chains); 2496 } 2497 2498 /* 2499 * Debugging 2500 */ 2501 void 2502 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2503 { 2504 hammer2_chain_t *scan; 2505 hammer2_chain_t *parent; 2506 2507 --*countp; 2508 if (*countp == 0) { 2509 kprintf("%*.*s...\n", tab, tab, ""); 2510 return; 2511 } 2512 if (*countp < 0) 2513 return; 2514 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2515 tab, tab, "", pfx, 2516 chain, chain->bref.type, 2517 chain->bref.key, chain->bref.keybits, 2518 chain->bref.mirror_tid); 2519 2520 kprintf("%*.*s [%08x] (%s) refs=%d", 2521 tab, tab, "", 2522 chain->flags, 2523 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2524 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2525 chain->refs); 2526 2527 parent = chain->parent; 2528 if (parent) 2529 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2530 tab, tab, "", 2531 parent, parent->flags, parent->refs); 2532 if (RB_EMPTY(&chain->core.rbtree)) { 2533 kprintf("\n"); 2534 } else { 2535 kprintf(" {\n"); 2536 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2537 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2538 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2539 kprintf("%*.*s}(%s)\n", tab, tab, "", 2540 chain->data->ipdata.filename); 2541 else 2542 kprintf("%*.*s}\n", tab, tab, ""); 2543 } 2544 } 2545