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