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_enable = 1; 82 int hammer2_hardlink_enable = 1; 83 int hammer2_flush_pipe = 100; 84 int hammer2_synchronous_flush = 1; 85 int hammer2_dio_count; 86 long hammer2_limit_dirty_chains; 87 long hammer2_iod_file_read; 88 long hammer2_iod_meta_read; 89 long hammer2_iod_indr_read; 90 long hammer2_iod_fmap_read; 91 long hammer2_iod_volu_read; 92 long hammer2_iod_file_write; 93 long hammer2_iod_meta_write; 94 long hammer2_iod_indr_write; 95 long hammer2_iod_fmap_write; 96 long hammer2_iod_volu_write; 97 long hammer2_ioa_file_read; 98 long hammer2_ioa_meta_read; 99 long hammer2_ioa_indr_read; 100 long hammer2_ioa_fmap_read; 101 long hammer2_ioa_volu_read; 102 long hammer2_ioa_fmap_write; 103 long hammer2_ioa_file_write; 104 long hammer2_ioa_meta_write; 105 long hammer2_ioa_indr_write; 106 long hammer2_ioa_volu_write; 107 108 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 109 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 110 "Buffer used for compression."); 111 112 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 113 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 114 "Buffer used for decompression."); 115 116 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 117 118 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 119 &hammer2_debug, 0, ""); 120 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW, 121 &hammer2_cluster_enable, 0, ""); 122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW, 123 &hammer2_hardlink_enable, 0, ""); 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 125 &hammer2_flush_pipe, 0, ""); 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW, 127 &hammer2_synchronous_flush, 0, ""); 128 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 129 &hammer2_limit_dirty_chains, 0, ""); 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 131 &hammer2_dio_count, 0, ""); 132 133 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 134 &hammer2_iod_file_read, 0, ""); 135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 136 &hammer2_iod_meta_read, 0, ""); 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 138 &hammer2_iod_indr_read, 0, ""); 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 140 &hammer2_iod_fmap_read, 0, ""); 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 142 &hammer2_iod_volu_read, 0, ""); 143 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 145 &hammer2_iod_file_write, 0, ""); 146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 147 &hammer2_iod_meta_write, 0, ""); 148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 149 &hammer2_iod_indr_write, 0, ""); 150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 151 &hammer2_iod_fmap_write, 0, ""); 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 153 &hammer2_iod_volu_write, 0, ""); 154 155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW, 156 &hammer2_ioa_file_read, 0, ""); 157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW, 158 &hammer2_ioa_meta_read, 0, ""); 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW, 160 &hammer2_ioa_indr_read, 0, ""); 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_read, CTLFLAG_RW, 162 &hammer2_ioa_fmap_read, 0, ""); 163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_read, CTLFLAG_RW, 164 &hammer2_ioa_volu_read, 0, ""); 165 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW, 167 &hammer2_ioa_file_write, 0, ""); 168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW, 169 &hammer2_ioa_meta_write, 0, ""); 170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW, 171 &hammer2_ioa_indr_write, 0, ""); 172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_fmap_write, CTLFLAG_RW, 173 &hammer2_ioa_fmap_write, 0, ""); 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW, 175 &hammer2_ioa_volu_write, 0, ""); 176 177 static int hammer2_vfs_init(struct vfsconf *conf); 178 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 179 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 180 struct ucred *cred); 181 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 182 struct vnode *, struct ucred *); 183 static int hammer2_recovery(hammer2_dev_t *hmp); 184 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 185 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 186 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 187 struct ucred *cred); 188 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 189 struct ucred *cred); 190 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 191 ino_t ino, struct vnode **vpp); 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 = desiredvnodes / 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) 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 (ripdata) { 332 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 333 if (bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 334 sizeof(pmp->pfs_clid)) == 0) { 335 break; 336 } 337 } 338 } else { 339 pmp = NULL; 340 } 341 342 if (pmp == NULL) { 343 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 344 hammer2_trans_manage_init(pmp); 345 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 346 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 347 lockinit(&pmp->lock, "pfslk", 0, 0); 348 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 349 RB_INIT(&pmp->inum_tree); 350 TAILQ_INIT(&pmp->unlinkq); 351 spin_init(&pmp->list_spin, "hm2pfsalloc_list"); 352 353 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 354 hammer2_xop_group_init(pmp, &pmp->xop_groups[j]); 355 356 /* 357 * Save the last media transaction id for the flusher. Set 358 * initial 359 */ 360 if (ripdata) 361 pmp->pfs_clid = ripdata->meta.pfs_clid; 362 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 363 364 /* 365 * The synchronization thread may start too early, make 366 * sure it stays frozen until we are ready to let it go. 367 * XXX 368 */ 369 /* 370 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 371 HAMMER2_THREAD_REMASTER; 372 */ 373 } 374 375 /* 376 * Create the PFS's root inode. 377 */ 378 if ((iroot = pmp->iroot) == NULL) { 379 iroot = hammer2_inode_get(pmp, NULL, NULL, -1); 380 pmp->iroot = iroot; 381 hammer2_inode_ref(iroot); 382 hammer2_inode_unlock(iroot); 383 } 384 385 /* 386 * Stop here if no chain is passed in. 387 */ 388 if (chain == NULL) 389 goto done; 390 391 /* 392 * When a chain is passed in we must add it to the PFS's root 393 * inode, update pmp->pfs_types[], and update the syncronization 394 * threads. 395 * 396 * At the moment empty spots can develop due to removals or failures. 397 * Ultimately we want to re-fill these spots but doing so might 398 * confused running code. XXX 399 */ 400 hammer2_inode_ref(iroot); 401 hammer2_mtx_ex(&iroot->lock); 402 j = iroot->cluster.nchains; 403 404 kprintf("add PFS to pmp %p[%d]\n", pmp, j); 405 406 if (j == HAMMER2_MAXCLUSTER) { 407 kprintf("hammer2_mount: cluster full!\n"); 408 /* XXX fatal error? */ 409 } else { 410 KKASSERT(chain->pmp == NULL); 411 chain->pmp = pmp; 412 hammer2_chain_ref(chain); 413 iroot->cluster.array[j].chain = chain; 414 pmp->pfs_types[j] = ripdata->meta.pfs_type; 415 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 416 pmp->pfs_hmps[j] = chain->hmp; 417 418 /* 419 * If the PFS is already mounted we must account 420 * for the mount_count here. 421 */ 422 if (pmp->mp) 423 ++chain->hmp->mount_count; 424 425 /* 426 * May have to fixup dirty chain tracking. Previous 427 * pmp was NULL so nothing to undo. 428 */ 429 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 430 hammer2_pfs_memory_inc(pmp); 431 ++j; 432 } 433 iroot->cluster.nchains = j; 434 435 /* 436 * Update nmasters from any PFS inode which is part of the cluster. 437 * It is possible that this will result in a value which is too 438 * high. MASTER PFSs are authoritative for pfs_nmasters and will 439 * override this value later on. 440 * 441 * (This informs us of masters that might not currently be 442 * discoverable by this mount). 443 */ 444 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 445 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 446 } 447 448 /* 449 * Count visible masters. Masters are usually added with 450 * ripdata->meta.pfs_nmasters set to 1. This detects when there 451 * are more (XXX and must update the master inodes). 452 */ 453 count = 0; 454 for (i = 0; i < iroot->cluster.nchains; ++i) { 455 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 456 ++count; 457 } 458 if (pmp->pfs_nmasters < count) 459 pmp->pfs_nmasters = count; 460 461 /* 462 * Create missing synchronization and support threads. 463 * 464 * Single-node masters (including snapshots) have nothing to 465 * synchronize and do not require this thread. 466 * 467 * Multi-node masters or any number of soft masters, slaves, copy, 468 * or other PFS types need the thread. 469 * 470 * Each thread is responsible for its particular cluster index. 471 * We use independent threads so stalls or mismatches related to 472 * any given target do not affect other targets. 473 */ 474 for (i = 0; i < iroot->cluster.nchains; ++i) { 475 /* 476 * Single-node masters (including snapshots) have nothing 477 * to synchronize and will make direct xops support calls, 478 * thus they do not require this thread. 479 * 480 * Note that there can be thousands of snapshots. We do not 481 * want to create thousands of threads. 482 */ 483 if (pmp->pfs_nmasters <= 1 && 484 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 485 continue; 486 } 487 488 /* 489 * Sync support thread 490 */ 491 if (pmp->sync_thrs[i].td == NULL) { 492 hammer2_thr_create(&pmp->sync_thrs[i], pmp, 493 "h2nod", i, -1, 494 hammer2_primary_sync_thread); 495 } 496 } 497 498 /* 499 * Create missing Xop threads 500 */ 501 if (pmp->mp) 502 hammer2_xop_helper_create(pmp); 503 504 hammer2_mtx_unlock(&iroot->lock); 505 hammer2_inode_drop(iroot); 506 done: 507 return pmp; 508 } 509 510 /* 511 * Destroy a PFS, typically only occurs after the last mount on a device 512 * has gone away. 513 */ 514 static void 515 hammer2_pfsfree(hammer2_pfs_t *pmp) 516 { 517 hammer2_inode_t *iroot; 518 int i; 519 int j; 520 521 /* 522 * Cleanup our reference on iroot. iroot is (should) not be needed 523 * by the flush code. 524 */ 525 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 526 527 iroot = pmp->iroot; 528 if (iroot) { 529 for (i = 0; i < iroot->cluster.nchains; ++i) { 530 hammer2_thr_delete(&pmp->sync_thrs[i]); 531 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 532 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 533 } 534 #if REPORT_REFS_ERRORS 535 if (pmp->iroot->refs != 1) 536 kprintf("PMP->IROOT %p REFS WRONG %d\n", 537 pmp->iroot, pmp->iroot->refs); 538 #else 539 KKASSERT(pmp->iroot->refs == 1); 540 #endif 541 /* ref for pmp->iroot */ 542 hammer2_inode_drop(pmp->iroot); 543 pmp->iroot = NULL; 544 } 545 546 kmalloc_destroy(&pmp->mmsg); 547 kmalloc_destroy(&pmp->minode); 548 549 kfree(pmp, M_HAMMER2); 550 } 551 552 /* 553 * Remove all references to hmp from the pfs list. Any PFS which becomes 554 * empty is terminated and freed. 555 * 556 * XXX inefficient. 557 */ 558 static void 559 hammer2_pfsfree_scan(hammer2_dev_t *hmp) 560 { 561 hammer2_pfs_t *pmp; 562 hammer2_inode_t *iroot; 563 hammer2_chain_t *rchain; 564 int didfreeze; 565 int i; 566 int j; 567 568 again: 569 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 570 if ((iroot = pmp->iroot) == NULL) 571 continue; 572 if (hmp->spmp == pmp) { 573 kprintf("unmount hmp %p remove spmp %p\n", 574 hmp, pmp); 575 hmp->spmp = NULL; 576 } 577 578 /* 579 * Determine if this PFS is affected. If it is we must 580 * freeze all management threads and lock its iroot. 581 * 582 * Freezing a management thread forces it idle, operations 583 * in-progress will be aborted and it will have to start 584 * over again when unfrozen, or exit if told to exit. 585 */ 586 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 587 if (pmp->pfs_hmps[i] == hmp) 588 break; 589 } 590 if (i != HAMMER2_MAXCLUSTER) { 591 /* 592 * Make sure all synchronization threads are locked 593 * down. 594 */ 595 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 596 if (pmp->pfs_hmps[i] == NULL) 597 continue; 598 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 599 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 600 hammer2_thr_freeze_async( 601 &pmp->xop_groups[j].thrs[i]); 602 } 603 } 604 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 605 if (pmp->pfs_hmps[i] == NULL) 606 continue; 607 hammer2_thr_freeze(&pmp->sync_thrs[i]); 608 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 609 hammer2_thr_freeze( 610 &pmp->xop_groups[j].thrs[i]); 611 } 612 } 613 614 /* 615 * Lock the inode and clean out matching chains. 616 * Note that we cannot use hammer2_inode_lock_*() 617 * here because that would attempt to validate the 618 * cluster that we are in the middle of ripping 619 * apart. 620 * 621 * WARNING! We are working directly on the inodes 622 * embedded cluster. 623 */ 624 hammer2_mtx_ex(&iroot->lock); 625 626 /* 627 * Remove the chain from matching elements of the PFS. 628 */ 629 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 630 if (pmp->pfs_hmps[i] != hmp) 631 continue; 632 hammer2_thr_delete(&pmp->sync_thrs[i]); 633 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 634 hammer2_thr_delete( 635 &pmp->xop_groups[j].thrs[i]); 636 } 637 rchain = iroot->cluster.array[i].chain; 638 iroot->cluster.array[i].chain = NULL; 639 pmp->pfs_types[i] = 0; 640 if (pmp->pfs_names[i]) { 641 kfree(pmp->pfs_names[i], M_HAMMER2); 642 pmp->pfs_names[i] = NULL; 643 } 644 if (rchain) { 645 hammer2_chain_drop(rchain); 646 /* focus hint */ 647 if (iroot->cluster.focus == rchain) 648 iroot->cluster.focus = NULL; 649 } 650 pmp->pfs_hmps[i] = NULL; 651 } 652 hammer2_mtx_unlock(&iroot->lock); 653 didfreeze = 1; /* remaster, unfreeze down below */ 654 } else { 655 didfreeze = 0; 656 } 657 658 /* 659 * Cleanup trailing chains. Gaps may remain. 660 */ 661 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 662 if (pmp->pfs_hmps[i]) 663 break; 664 } 665 iroot->cluster.nchains = i + 1; 666 667 /* 668 * If the PMP has no elements remaining we can destroy it. 669 * (this will transition management threads from frozen->exit). 670 */ 671 if (iroot->cluster.nchains == 0) { 672 kprintf("unmount hmp %p last ref to PMP=%p\n", 673 hmp, pmp); 674 hammer2_pfsfree(pmp); 675 goto again; 676 } 677 678 /* 679 * If elements still remain we need to set the REMASTER 680 * flag and unfreeze it. 681 */ 682 if (didfreeze) { 683 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 684 if (pmp->pfs_hmps[i] == NULL) 685 continue; 686 hammer2_thr_remaster(&pmp->sync_thrs[i]); 687 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 688 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 689 hammer2_thr_remaster( 690 &pmp->xop_groups[j].thrs[i]); 691 hammer2_thr_unfreeze( 692 &pmp->xop_groups[j].thrs[i]); 693 } 694 } 695 } 696 } 697 } 698 699 /* 700 * Mount or remount HAMMER2 fileystem from physical media 701 * 702 * mountroot 703 * mp mount point structure 704 * path NULL 705 * data <unused> 706 * cred <unused> 707 * 708 * mount 709 * mp mount point structure 710 * path path to mount point 711 * data pointer to argument structure in user space 712 * volume volume path (device@LABEL form) 713 * hflags user mount flags 714 * cred user credentials 715 * 716 * RETURNS: 0 Success 717 * !0 error number 718 */ 719 static 720 int 721 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 722 struct ucred *cred) 723 { 724 struct hammer2_mount_info info; 725 hammer2_pfs_t *pmp; 726 hammer2_pfs_t *spmp; 727 hammer2_dev_t *hmp; 728 hammer2_key_t key_next; 729 hammer2_key_t key_dummy; 730 hammer2_key_t lhc; 731 struct vnode *devvp; 732 struct nlookupdata nd; 733 hammer2_chain_t *parent; 734 hammer2_chain_t *chain; 735 hammer2_cluster_t *cluster; 736 const hammer2_inode_data_t *ripdata; 737 hammer2_blockref_t bref; 738 struct file *fp; 739 char devstr[MNAMELEN]; 740 size_t size; 741 size_t done; 742 char *dev; 743 char *label; 744 int ronly = 1; 745 int error; 746 int cache_index; 747 int i; 748 749 hmp = NULL; 750 pmp = NULL; 751 dev = NULL; 752 label = NULL; 753 devvp = NULL; 754 cache_index = -1; 755 756 kprintf("hammer2_mount\n"); 757 758 if (path == NULL) { 759 /* 760 * Root mount 761 */ 762 bzero(&info, sizeof(info)); 763 info.cluster_fd = -1; 764 return (EOPNOTSUPP); 765 } else { 766 /* 767 * Non-root mount or updating a mount 768 */ 769 error = copyin(data, &info, sizeof(info)); 770 if (error) 771 return (error); 772 773 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 774 if (error) 775 return (error); 776 777 /* Extract device and label */ 778 dev = devstr; 779 label = strchr(devstr, '@'); 780 if (label == NULL || 781 ((label + 1) - dev) > done) { 782 return (EINVAL); 783 } 784 *label = '\0'; 785 label++; 786 if (*label == '\0') 787 return (EINVAL); 788 789 if (mp->mnt_flag & MNT_UPDATE) { 790 /* 791 * Update mount. Note that pmp->iroot->cluster is 792 * an inode-embedded cluster and thus cannot be 793 * directly locked. 794 * 795 * XXX HAMMER2 needs to implement NFS export via 796 * mountctl. 797 */ 798 pmp = MPTOPMP(mp); 799 cluster = &pmp->iroot->cluster; 800 for (i = 0; i < cluster->nchains; ++i) { 801 if (cluster->array[i].chain == NULL) 802 continue; 803 hmp = cluster->array[i].chain->hmp; 804 devvp = hmp->devvp; 805 error = hammer2_remount(hmp, mp, path, 806 devvp, cred); 807 if (error) 808 break; 809 } 810 811 return error; 812 } 813 } 814 815 /* 816 * HMP device mount 817 * 818 * Lookup name and verify it refers to a block device. 819 */ 820 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 821 if (error == 0) 822 error = nlookup(&nd); 823 if (error == 0) 824 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 825 nlookup_done(&nd); 826 827 if (error == 0) { 828 if (vn_isdisk(devvp, &error)) 829 error = vfs_mountedon(devvp); 830 } 831 832 /* 833 * Determine if the device has already been mounted. After this 834 * check hmp will be non-NULL if we are doing the second or more 835 * hammer2 mounts from the same device. 836 */ 837 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 838 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 839 if (hmp->devvp == devvp) 840 break; 841 } 842 843 /* 844 * Open the device if this isn't a secondary mount and construct 845 * the H2 device mount (hmp). 846 */ 847 if (hmp == NULL) { 848 hammer2_chain_t *schain; 849 hammer2_xid_t xid; 850 851 if (error == 0 && vcount(devvp) > 0) 852 error = EBUSY; 853 854 /* 855 * Now open the device 856 */ 857 if (error == 0) { 858 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 859 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 860 error = vinvalbuf(devvp, V_SAVE, 0, 0); 861 if (error == 0) { 862 error = VOP_OPEN(devvp, 863 ronly ? FREAD : FREAD | FWRITE, 864 FSCRED, NULL); 865 } 866 vn_unlock(devvp); 867 } 868 if (error && devvp) { 869 vrele(devvp); 870 devvp = NULL; 871 } 872 if (error) { 873 lockmgr(&hammer2_mntlk, LK_RELEASE); 874 return error; 875 } 876 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 877 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 878 hmp->ronly = ronly; 879 hmp->devvp = devvp; 880 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 881 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 882 RB_INIT(&hmp->iotree); 883 spin_init(&hmp->io_spin, "hm2mount_io"); 884 spin_init(&hmp->list_spin, "hm2mount_list"); 885 TAILQ_INIT(&hmp->flushq); 886 887 lockinit(&hmp->vollk, "h2vol", 0, 0); 888 889 /* 890 * vchain setup. vchain.data is embedded. 891 * vchain.refs is initialized and will never drop to 0. 892 * 893 * NOTE! voldata is not yet loaded. 894 */ 895 hmp->vchain.hmp = hmp; 896 hmp->vchain.refs = 1; 897 hmp->vchain.data = (void *)&hmp->voldata; 898 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 899 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 900 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 901 902 hammer2_chain_core_init(&hmp->vchain); 903 /* hmp->vchain.u.xxx is left NULL */ 904 905 /* 906 * fchain setup. fchain.data is embedded. 907 * fchain.refs is initialized and will never drop to 0. 908 * 909 * The data is not used but needs to be initialized to 910 * pass assertion muster. We use this chain primarily 911 * as a placeholder for the freemap's top-level RBTREE 912 * so it does not interfere with the volume's topology 913 * RBTREE. 914 */ 915 hmp->fchain.hmp = hmp; 916 hmp->fchain.refs = 1; 917 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 918 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 919 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 920 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 921 hmp->fchain.bref.methods = 922 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 923 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 924 925 hammer2_chain_core_init(&hmp->fchain); 926 /* hmp->fchain.u.xxx is left NULL */ 927 928 /* 929 * Install the volume header and initialize fields from 930 * voldata. 931 */ 932 error = hammer2_install_volume_header(hmp); 933 if (error) { 934 hammer2_unmount_helper(mp, NULL, hmp); 935 lockmgr(&hammer2_mntlk, LK_RELEASE); 936 hammer2_vfs_unmount(mp, MNT_FORCE); 937 return error; 938 } 939 940 /* 941 * Really important to get these right or flush will get 942 * confused. 943 */ 944 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0); 945 kprintf("alloc spmp %p tid %016jx\n", 946 hmp->spmp, hmp->voldata.mirror_tid); 947 spmp = hmp->spmp; 948 949 /* 950 * Dummy-up vchain and fchain's modify_tid. mirror_tid 951 * is inherited from the volume header. 952 */ 953 xid = 0; 954 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 955 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 956 hmp->vchain.pmp = spmp; 957 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 958 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 959 hmp->fchain.pmp = spmp; 960 961 /* 962 * First locate the super-root inode, which is key 0 963 * relative to the volume header's blockset. 964 * 965 * Then locate the root inode by scanning the directory keyspace 966 * represented by the label. 967 */ 968 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 969 schain = hammer2_chain_lookup(&parent, &key_dummy, 970 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 971 &cache_index, 0); 972 hammer2_chain_lookup_done(parent); 973 if (schain == NULL) { 974 kprintf("hammer2_mount: invalid super-root\n"); 975 hammer2_unmount_helper(mp, NULL, hmp); 976 lockmgr(&hammer2_mntlk, LK_RELEASE); 977 hammer2_vfs_unmount(mp, MNT_FORCE); 978 return EINVAL; 979 } 980 if (schain->error) { 981 kprintf("hammer2_mount: error %s reading super-root\n", 982 hammer2_error_str(schain->error)); 983 hammer2_chain_unlock(schain); 984 hammer2_chain_drop(schain); 985 schain = NULL; 986 hammer2_unmount_helper(mp, NULL, hmp); 987 lockmgr(&hammer2_mntlk, LK_RELEASE); 988 hammer2_vfs_unmount(mp, MNT_FORCE); 989 return EINVAL; 990 } 991 992 /* 993 * The super-root always uses an inode_tid of 1 when 994 * creating PFSs. 995 */ 996 spmp->inode_tid = 1; 997 spmp->modify_tid = schain->bref.modify_tid + 1; 998 999 /* 1000 * Sanity-check schain's pmp and finish initialization. 1001 * Any chain belonging to the super-root topology should 1002 * have a NULL pmp (not even set to spmp). 1003 */ 1004 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1005 KKASSERT(schain->pmp == NULL); 1006 spmp->pfs_clid = ripdata->meta.pfs_clid; 1007 1008 /* 1009 * Replace the dummy spmp->iroot with a real one. It's 1010 * easier to just do a wholesale replacement than to try 1011 * to update the chain and fixup the iroot fields. 1012 * 1013 * The returned inode is locked with the supplied cluster. 1014 */ 1015 cluster = hammer2_cluster_from_chain(schain); 1016 hammer2_inode_drop(spmp->iroot); 1017 spmp->iroot = NULL; 1018 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1019 spmp->spmp_hmp = hmp; 1020 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1021 spmp->pfs_hmps[0] = hmp; 1022 hammer2_inode_ref(spmp->iroot); 1023 hammer2_inode_unlock(spmp->iroot); 1024 hammer2_cluster_unlock(cluster); 1025 hammer2_cluster_drop(cluster); 1026 schain = NULL; 1027 /* leave spmp->iroot with one ref */ 1028 1029 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1030 error = hammer2_recovery(hmp); 1031 /* XXX do something with error */ 1032 } 1033 hammer2_update_pmps(hmp); 1034 hammer2_iocom_init(hmp); 1035 1036 /* 1037 * Ref the cluster management messaging descriptor. The mount 1038 * program deals with the other end of the communications pipe. 1039 */ 1040 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1041 if (fp) { 1042 hammer2_cluster_reconnect(hmp, fp); 1043 } else { 1044 kprintf("hammer2_mount: bad cluster_fd!\n"); 1045 } 1046 } else { 1047 spmp = hmp->spmp; 1048 } 1049 1050 /* 1051 * Lookup the mount point under the media-localized super-root. 1052 * Scanning hammer2_pfslist doesn't help us because it represents 1053 * PFS cluster ids which can aggregate several named PFSs together. 1054 * 1055 * cluster->pmp will incorrectly point to spmp and must be fixed 1056 * up later on. 1057 */ 1058 hammer2_inode_lock(spmp->iroot, 0); 1059 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1060 lhc = hammer2_dirhash(label, strlen(label)); 1061 chain = hammer2_chain_lookup(&parent, &key_next, 1062 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1063 &cache_index, 0); 1064 while (chain) { 1065 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1066 strcmp(label, chain->data->ipdata.filename) == 0) { 1067 break; 1068 } 1069 chain = hammer2_chain_next(&parent, chain, &key_next, 1070 key_next, 1071 lhc + HAMMER2_DIRHASH_LOMASK, 1072 &cache_index, 0); 1073 } 1074 if (parent) { 1075 hammer2_chain_unlock(parent); 1076 hammer2_chain_drop(parent); 1077 } 1078 hammer2_inode_unlock(spmp->iroot); 1079 1080 /* 1081 * PFS could not be found? 1082 */ 1083 if (chain == NULL) { 1084 kprintf("hammer2_mount: PFS label not found\n"); 1085 hammer2_unmount_helper(mp, NULL, hmp); 1086 lockmgr(&hammer2_mntlk, LK_RELEASE); 1087 hammer2_vfs_unmount(mp, MNT_FORCE); 1088 1089 return EINVAL; 1090 } 1091 1092 /* 1093 * Acquire the pmp structure (it should have already been allocated 1094 * via hammer2_update_pmps() so do not pass cluster in to add to 1095 * available chains). 1096 * 1097 * Check if the cluster has already been mounted. A cluster can 1098 * only be mounted once, use null mounts to mount additional copies. 1099 */ 1100 ripdata = &chain->data->ipdata; 1101 bref = chain->bref; 1102 pmp = hammer2_pfsalloc(NULL, ripdata, bref.modify_tid); 1103 hammer2_chain_unlock(chain); 1104 hammer2_chain_drop(chain); 1105 1106 if (pmp->mp) { 1107 kprintf("hammer2_mount: PFS already mounted!\n"); 1108 hammer2_unmount_helper(mp, NULL, hmp); 1109 lockmgr(&hammer2_mntlk, LK_RELEASE); 1110 hammer2_vfs_unmount(mp, MNT_FORCE); 1111 1112 return EBUSY; 1113 } 1114 1115 /* 1116 * Finish the mount 1117 */ 1118 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1119 1120 mp->mnt_flag = MNT_LOCAL; 1121 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1122 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1123 1124 /* 1125 * required mount structure initializations 1126 */ 1127 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1128 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1129 1130 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1131 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1132 1133 /* 1134 * Optional fields 1135 */ 1136 mp->mnt_iosize_max = MAXPHYS; 1137 1138 /* 1139 * Connect up mount pointers. 1140 */ 1141 hammer2_mount_helper(mp, pmp); 1142 1143 lockmgr(&hammer2_mntlk, LK_RELEASE); 1144 1145 /* 1146 * Finish setup 1147 */ 1148 vfs_getnewfsid(mp); 1149 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1150 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1151 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1152 1153 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 1154 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1155 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1156 copyinstr(path, mp->mnt_stat.f_mntonname, 1157 sizeof(mp->mnt_stat.f_mntonname) - 1, 1158 &size); 1159 1160 /* 1161 * Initial statfs to prime mnt_stat. 1162 */ 1163 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1164 1165 return 0; 1166 } 1167 1168 /* 1169 * Scan PFSs under the super-root and create hammer2_pfs structures. 1170 */ 1171 static 1172 void 1173 hammer2_update_pmps(hammer2_dev_t *hmp) 1174 { 1175 const hammer2_inode_data_t *ripdata; 1176 hammer2_chain_t *parent; 1177 hammer2_chain_t *chain; 1178 hammer2_blockref_t bref; 1179 hammer2_pfs_t *spmp; 1180 hammer2_pfs_t *pmp; 1181 hammer2_key_t key_next; 1182 int cache_index = -1; 1183 1184 /* 1185 * Lookup mount point under the media-localized super-root. 1186 * 1187 * cluster->pmp will incorrectly point to spmp and must be fixed 1188 * up later on. 1189 */ 1190 spmp = hmp->spmp; 1191 hammer2_inode_lock(spmp->iroot, 0); 1192 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1193 chain = hammer2_chain_lookup(&parent, &key_next, 1194 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1195 &cache_index, 0); 1196 while (chain) { 1197 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1198 continue; 1199 ripdata = &chain->data->ipdata; 1200 bref = chain->bref; 1201 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename); 1202 1203 pmp = hammer2_pfsalloc(chain, ripdata, bref.modify_tid); 1204 chain = hammer2_chain_next(&parent, chain, &key_next, 1205 key_next, HAMMER2_KEY_MAX, 1206 &cache_index, 0); 1207 } 1208 if (parent) { 1209 hammer2_chain_unlock(parent); 1210 hammer2_chain_drop(parent); 1211 } 1212 hammer2_inode_unlock(spmp->iroot); 1213 } 1214 1215 static 1216 int 1217 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path, 1218 struct vnode *devvp, struct ucred *cred) 1219 { 1220 int error; 1221 1222 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1223 error = hammer2_recovery(hmp); 1224 } else { 1225 error = 0; 1226 } 1227 return error; 1228 } 1229 1230 static 1231 int 1232 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1233 { 1234 hammer2_pfs_t *pmp; 1235 int flags; 1236 int error = 0; 1237 1238 pmp = MPTOPMP(mp); 1239 1240 if (pmp == NULL) 1241 return(0); 1242 1243 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1244 1245 /* 1246 * If mount initialization proceeded far enough we must flush 1247 * its vnodes and sync the underlying mount points. Three syncs 1248 * are required to fully flush the filesystem (freemap updates lag 1249 * by one flush, and one extra for safety). 1250 */ 1251 if (mntflags & MNT_FORCE) 1252 flags = FORCECLOSE; 1253 else 1254 flags = 0; 1255 if (pmp->iroot) { 1256 error = vflush(mp, 0, flags); 1257 if (error) 1258 goto failed; 1259 hammer2_vfs_sync(mp, MNT_WAIT); 1260 hammer2_vfs_sync(mp, MNT_WAIT); 1261 hammer2_vfs_sync(mp, MNT_WAIT); 1262 } 1263 1264 /* 1265 * Cleanup the frontend support XOPS threads 1266 */ 1267 hammer2_xop_helper_cleanup(pmp); 1268 1269 /* 1270 * Cleanup our reference on ihidden. 1271 */ 1272 if (pmp->ihidden) { 1273 hammer2_inode_drop(pmp->ihidden); 1274 pmp->ihidden = NULL; 1275 } 1276 if (pmp->mp) 1277 hammer2_unmount_helper(mp, pmp, NULL); 1278 1279 error = 0; 1280 failed: 1281 lockmgr(&hammer2_mntlk, LK_RELEASE); 1282 1283 return (error); 1284 } 1285 1286 /* 1287 * Mount helper, hook the system mount into our PFS. 1288 * The mount lock is held. 1289 * 1290 * We must bump the mount_count on related devices for any 1291 * mounted PFSs. 1292 */ 1293 static 1294 void 1295 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1296 { 1297 hammer2_cluster_t *cluster; 1298 hammer2_chain_t *rchain; 1299 int i; 1300 1301 mp->mnt_data = (qaddr_t)pmp; 1302 pmp->mp = mp; 1303 1304 /* 1305 * After pmp->mp is set we have to adjust hmp->mount_count. 1306 */ 1307 cluster = &pmp->iroot->cluster; 1308 for (i = 0; i < cluster->nchains; ++i) { 1309 rchain = cluster->array[i].chain; 1310 if (rchain == NULL) 1311 continue; 1312 ++rchain->hmp->mount_count; 1313 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1314 rchain->hmp, rchain->hmp->mount_count); 1315 } 1316 1317 /* 1318 * Create missing Xop threads 1319 */ 1320 hammer2_xop_helper_create(pmp); 1321 } 1322 1323 /* 1324 * Mount helper, unhook the system mount from our PFS. 1325 * The mount lock is held. 1326 * 1327 * If hmp is supplied a mount responsible for being the first to open 1328 * the block device failed and the block device and all PFSs using the 1329 * block device must be cleaned up. 1330 * 1331 * If pmp is supplied multiple devices might be backing the PFS and each 1332 * must be disconnect. This might not be the last PFS using some of the 1333 * underlying devices. Also, we have to adjust our hmp->mount_count 1334 * accounting for the devices backing the pmp which is now undergoing an 1335 * unmount. 1336 */ 1337 static 1338 void 1339 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1340 { 1341 hammer2_cluster_t *cluster; 1342 hammer2_chain_t *rchain; 1343 struct vnode *devvp; 1344 int dumpcnt; 1345 int ronly = 0; 1346 int i; 1347 1348 /* 1349 * If no device supplied this is a high-level unmount and we have to 1350 * to disconnect the mount, adjust mount_count, and locate devices 1351 * that might now have no mounts. 1352 */ 1353 if (pmp) { 1354 KKASSERT(hmp == NULL); 1355 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1356 pmp->mp = NULL; 1357 mp->mnt_data = NULL; 1358 1359 /* 1360 * After pmp->mp is cleared we have to account for 1361 * mount_count. 1362 */ 1363 cluster = &pmp->iroot->cluster; 1364 for (i = 0; i < cluster->nchains; ++i) { 1365 rchain = cluster->array[i].chain; 1366 if (rchain == NULL) 1367 continue; 1368 --rchain->hmp->mount_count; 1369 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n", 1370 rchain->hmp, rchain->hmp->mount_count); 1371 /* scrapping hmp now may invalidate the pmp */ 1372 } 1373 again: 1374 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1375 if (hmp->mount_count == 0) { 1376 hammer2_unmount_helper(NULL, NULL, hmp); 1377 goto again; 1378 } 1379 } 1380 return; 1381 } 1382 1383 /* 1384 * Try to terminate the block device. We can't terminate it if 1385 * there are still PFSs referencing it. 1386 */ 1387 kprintf("hammer2_unmount hmp=%p mount_count=%d\n", 1388 hmp, hmp->mount_count); 1389 if (hmp->mount_count) 1390 return; 1391 1392 hammer2_pfsfree_scan(hmp); 1393 hammer2_dev_exlock(hmp); /* XXX order */ 1394 1395 /* 1396 * Cycle the volume data lock as a safety (probably not needed any 1397 * more). To ensure everything is out we need to flush at least 1398 * three times. (1) The running of the unlinkq can dirty the 1399 * filesystem, (2) A normal flush can dirty the freemap, and 1400 * (3) ensure that the freemap is fully synchronized. 1401 * 1402 * The next mount's recovery scan can clean everything up but we want 1403 * to leave the filesystem in a 100% clean state on a normal unmount. 1404 */ 1405 #if 0 1406 hammer2_voldata_lock(hmp); 1407 hammer2_voldata_unlock(hmp); 1408 #endif 1409 hammer2_iocom_uninit(hmp); 1410 1411 if ((hmp->vchain.flags | hmp->fchain.flags) & 1412 HAMMER2_CHAIN_FLUSH_MASK) { 1413 kprintf("hammer2_unmount: chains left over " 1414 "after final sync\n"); 1415 kprintf(" vchain %08x\n", hmp->vchain.flags); 1416 kprintf(" fchain %08x\n", hmp->fchain.flags); 1417 1418 if (hammer2_debug & 0x0010) 1419 Debugger("entered debugger"); 1420 } 1421 1422 KKASSERT(hmp->spmp == NULL); 1423 1424 /* 1425 * Finish up with the device vnode 1426 */ 1427 if ((devvp = hmp->devvp) != NULL) { 1428 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1429 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1430 hmp->devvp = NULL; 1431 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1432 vn_unlock(devvp); 1433 vrele(devvp); 1434 devvp = NULL; 1435 } 1436 1437 /* 1438 * Clear vchain/fchain flags that might prevent final cleanup 1439 * of these chains. 1440 */ 1441 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1442 atomic_clear_int(&hmp->vchain.flags, 1443 HAMMER2_CHAIN_MODIFIED); 1444 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1445 hammer2_chain_drop(&hmp->vchain); 1446 } 1447 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1448 atomic_clear_int(&hmp->vchain.flags, 1449 HAMMER2_CHAIN_UPDATE); 1450 hammer2_chain_drop(&hmp->vchain); 1451 } 1452 1453 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1454 atomic_clear_int(&hmp->fchain.flags, 1455 HAMMER2_CHAIN_MODIFIED); 1456 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1457 hammer2_chain_drop(&hmp->fchain); 1458 } 1459 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1460 atomic_clear_int(&hmp->fchain.flags, 1461 HAMMER2_CHAIN_UPDATE); 1462 hammer2_chain_drop(&hmp->fchain); 1463 } 1464 1465 /* 1466 * Final drop of embedded freemap root chain to 1467 * clean up fchain.core (fchain structure is not 1468 * flagged ALLOCATED so it is cleaned out and then 1469 * left to rot). 1470 */ 1471 hammer2_chain_drop(&hmp->fchain); 1472 1473 /* 1474 * Final drop of embedded volume root chain to clean 1475 * up vchain.core (vchain structure is not flagged 1476 * ALLOCATED so it is cleaned out and then left to 1477 * rot). 1478 */ 1479 dumpcnt = 50; 1480 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1481 dumpcnt = 50; 1482 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1483 hammer2_dev_unlock(hmp); 1484 hammer2_chain_drop(&hmp->vchain); 1485 1486 hammer2_io_cleanup(hmp, &hmp->iotree); 1487 if (hmp->iofree_count) { 1488 kprintf("io_cleanup: %d I/O's left hanging\n", 1489 hmp->iofree_count); 1490 } 1491 1492 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1493 kmalloc_destroy(&hmp->mchain); 1494 kfree(hmp, M_HAMMER2); 1495 } 1496 1497 static 1498 int 1499 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1500 ino_t ino, struct vnode **vpp) 1501 { 1502 kprintf("hammer2_vget\n"); 1503 return (EOPNOTSUPP); 1504 } 1505 1506 static 1507 int 1508 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1509 { 1510 hammer2_pfs_t *pmp; 1511 int error; 1512 struct vnode *vp; 1513 1514 pmp = MPTOPMP(mp); 1515 if (pmp->iroot == NULL) { 1516 *vpp = NULL; 1517 return EINVAL; 1518 } 1519 1520 error = 0; 1521 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1522 1523 while (pmp->inode_tid == 0) { 1524 hammer2_xop_ipcluster_t *xop; 1525 hammer2_inode_meta_t *meta; 1526 1527 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1528 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1529 error = hammer2_xop_collect(&xop->head, 0); 1530 1531 if (error == 0) { 1532 meta = &xop->head.cluster.focus->data->ipdata.meta; 1533 pmp->iroot->meta = *meta; 1534 pmp->inode_tid = meta->pfs_inum + 1; 1535 if (pmp->inode_tid < HAMMER2_INODE_START) 1536 pmp->inode_tid = HAMMER2_INODE_START; 1537 pmp->modify_tid = 1538 xop->head.cluster.focus->bref.modify_tid + 1; 1539 kprintf("PFS: Starting inode %jd\n", 1540 (intmax_t)pmp->inode_tid); 1541 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1542 pmp->inode_tid, pmp->modify_tid); 1543 wakeup(&pmp->iroot); 1544 1545 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1546 1547 /* 1548 * Prime the mount info. 1549 */ 1550 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1551 1552 /* 1553 * With the cluster operational, check for and 1554 * install ihidden if needed. The install_hidden 1555 * code needs to get a transaction so we must unlock 1556 * iroot around it. 1557 * 1558 * This is only applicable PFS mounts, there is no 1559 * hidden directory in the spmp. 1560 */ 1561 hammer2_inode_unlock(pmp->iroot); 1562 hammer2_inode_install_hidden(pmp); 1563 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1564 1565 break; 1566 } 1567 1568 /* 1569 * Loop, try again 1570 */ 1571 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1572 hammer2_inode_unlock(pmp->iroot); 1573 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1574 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1575 if (error == EINTR) 1576 break; 1577 } 1578 1579 if (error) { 1580 hammer2_inode_unlock(pmp->iroot); 1581 *vpp = NULL; 1582 } else { 1583 vp = hammer2_igetv(pmp->iroot, &error); 1584 hammer2_inode_unlock(pmp->iroot); 1585 *vpp = vp; 1586 } 1587 1588 return (error); 1589 } 1590 1591 /* 1592 * Filesystem status 1593 * 1594 * XXX incorporate ipdata->meta.inode_quota and data_quota 1595 */ 1596 static 1597 int 1598 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1599 { 1600 hammer2_pfs_t *pmp; 1601 hammer2_dev_t *hmp; 1602 hammer2_blockref_t bref; 1603 int i; 1604 1605 /* 1606 * NOTE: iroot might not have validated the cluster yet. 1607 */ 1608 pmp = MPTOPMP(mp); 1609 1610 mp->mnt_stat.f_files = 0; 1611 mp->mnt_stat.f_ffree = 0; 1612 mp->mnt_stat.f_blocks = 0; 1613 mp->mnt_stat.f_bfree = 0; 1614 mp->mnt_stat.f_bavail = 0; 1615 1616 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1617 hmp = pmp->pfs_hmps[i]; 1618 if (hmp == NULL) 1619 continue; 1620 if (pmp->iroot->cluster.array[i].chain) 1621 bref = pmp->iroot->cluster.array[i].chain->bref; 1622 else 1623 bzero(&bref, sizeof(bref)); 1624 1625 mp->mnt_stat.f_files = bref.inode_count; 1626 mp->mnt_stat.f_ffree = 0; 1627 mp->mnt_stat.f_blocks = (bref.data_count + 1628 hmp->voldata.allocator_free) / 1629 mp->mnt_vstat.f_bsize; 1630 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1631 mp->mnt_vstat.f_bsize; 1632 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1633 1634 *sbp = mp->mnt_stat; 1635 } 1636 return (0); 1637 } 1638 1639 static 1640 int 1641 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1642 { 1643 hammer2_pfs_t *pmp; 1644 hammer2_dev_t *hmp; 1645 hammer2_blockref_t bref; 1646 int i; 1647 1648 /* 1649 * NOTE: iroot might not have validated the cluster yet. 1650 */ 1651 pmp = MPTOPMP(mp); 1652 1653 mp->mnt_vstat.f_bsize = 0; 1654 mp->mnt_vstat.f_files = 0; 1655 mp->mnt_vstat.f_ffree = 0; 1656 mp->mnt_vstat.f_blocks = 0; 1657 mp->mnt_vstat.f_bfree = 0; 1658 mp->mnt_vstat.f_bavail = 0; 1659 1660 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1661 hmp = pmp->pfs_hmps[i]; 1662 if (hmp == NULL) 1663 continue; 1664 if (pmp->iroot->cluster.array[i].chain) 1665 bref = pmp->iroot->cluster.array[i].chain->bref; 1666 else 1667 bzero(&bref, sizeof(bref)); 1668 1669 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1670 mp->mnt_vstat.f_files = bref.inode_count; 1671 mp->mnt_vstat.f_ffree = 0; 1672 mp->mnt_vstat.f_blocks = (bref.data_count + 1673 hmp->voldata.allocator_free) / 1674 mp->mnt_vstat.f_bsize; 1675 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1676 mp->mnt_vstat.f_bsize; 1677 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1678 1679 *sbp = mp->mnt_vstat; 1680 } 1681 return (0); 1682 } 1683 1684 /* 1685 * Mount-time recovery (RW mounts) 1686 * 1687 * Updates to the free block table are allowed to lag flushes by one 1688 * transaction. In case of a crash, then on a fresh mount we must do an 1689 * incremental scan of the last committed transaction id and make sure that 1690 * all related blocks have been marked allocated. 1691 * 1692 * The super-root topology and each PFS has its own transaction id domain, 1693 * so we must track PFS boundary transitions. 1694 */ 1695 struct hammer2_recovery_elm { 1696 TAILQ_ENTRY(hammer2_recovery_elm) entry; 1697 hammer2_chain_t *chain; 1698 hammer2_tid_t sync_tid; 1699 }; 1700 1701 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 1702 1703 struct hammer2_recovery_info { 1704 struct hammer2_recovery_list list; 1705 hammer2_tid_t mtid; 1706 int depth; 1707 }; 1708 1709 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 1710 hammer2_chain_t *parent, 1711 struct hammer2_recovery_info *info, 1712 hammer2_tid_t sync_tid); 1713 1714 #define HAMMER2_RECOVERY_MAXDEPTH 10 1715 1716 static 1717 int 1718 hammer2_recovery(hammer2_dev_t *hmp) 1719 { 1720 struct hammer2_recovery_info info; 1721 struct hammer2_recovery_elm *elm; 1722 hammer2_chain_t *parent; 1723 hammer2_tid_t sync_tid; 1724 hammer2_tid_t mirror_tid; 1725 int error; 1726 int cumulative_error = 0; 1727 1728 hammer2_trans_init(hmp->spmp, 0); 1729 1730 sync_tid = hmp->voldata.freemap_tid; 1731 mirror_tid = hmp->voldata.mirror_tid; 1732 1733 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 1734 if (sync_tid >= mirror_tid) { 1735 kprintf(" no recovery needed\n"); 1736 } else { 1737 kprintf(" freemap recovery %016jx-%016jx\n", 1738 sync_tid + 1, mirror_tid); 1739 } 1740 1741 TAILQ_INIT(&info.list); 1742 info.depth = 0; 1743 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1744 cumulative_error = hammer2_recovery_scan(hmp, parent, 1745 &info, sync_tid); 1746 hammer2_chain_lookup_done(parent); 1747 1748 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 1749 TAILQ_REMOVE(&info.list, elm, entry); 1750 parent = elm->chain; 1751 sync_tid = elm->sync_tid; 1752 kfree(elm, M_HAMMER2); 1753 1754 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1755 error = hammer2_recovery_scan(hmp, parent, 1756 &info, hmp->voldata.freemap_tid); 1757 hammer2_chain_unlock(parent); 1758 hammer2_chain_drop(parent); /* drop elm->chain ref */ 1759 if (error) 1760 cumulative_error = error; 1761 } 1762 hammer2_trans_done(hmp->spmp); 1763 1764 return cumulative_error; 1765 } 1766 1767 static 1768 int 1769 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 1770 struct hammer2_recovery_info *info, 1771 hammer2_tid_t sync_tid) 1772 { 1773 const hammer2_inode_data_t *ripdata; 1774 hammer2_chain_t *chain; 1775 int cache_index; 1776 int cumulative_error = 0; 1777 int error; 1778 1779 /* 1780 * Adjust freemap to ensure that the block(s) are marked allocated. 1781 */ 1782 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 1783 hammer2_freemap_adjust(hmp, &parent->bref, 1784 HAMMER2_FREEMAP_DORECOVER); 1785 } 1786 1787 /* 1788 * Check type for recursive scan 1789 */ 1790 switch(parent->bref.type) { 1791 case HAMMER2_BREF_TYPE_VOLUME: 1792 /* data already instantiated */ 1793 break; 1794 case HAMMER2_BREF_TYPE_INODE: 1795 /* 1796 * Must instantiate data for DIRECTDATA test and also 1797 * for recursion. 1798 */ 1799 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1800 ripdata = &hammer2_chain_rdata(parent)->ipdata; 1801 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 1802 /* not applicable to recovery scan */ 1803 hammer2_chain_unlock(parent); 1804 return 0; 1805 } 1806 hammer2_chain_unlock(parent); 1807 break; 1808 case HAMMER2_BREF_TYPE_INDIRECT: 1809 /* 1810 * Must instantiate data for recursion 1811 */ 1812 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1813 hammer2_chain_unlock(parent); 1814 break; 1815 case HAMMER2_BREF_TYPE_DATA: 1816 case HAMMER2_BREF_TYPE_FREEMAP: 1817 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 1818 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 1819 /* not applicable to recovery scan */ 1820 return 0; 1821 break; 1822 default: 1823 return EDOM; 1824 } 1825 1826 /* 1827 * Defer operation if depth limit reached or if we are crossing a 1828 * PFS boundary. 1829 */ 1830 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 1831 struct hammer2_recovery_elm *elm; 1832 1833 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 1834 elm->chain = parent; 1835 elm->sync_tid = sync_tid; 1836 hammer2_chain_ref(parent); 1837 TAILQ_INSERT_TAIL(&info->list, elm, entry); 1838 /* unlocked by caller */ 1839 1840 return(0); 1841 } 1842 1843 1844 /* 1845 * Recursive scan of the last flushed transaction only. We are 1846 * doing this without pmp assignments so don't leave the chains 1847 * hanging around after we are done with them. 1848 */ 1849 cache_index = 0; 1850 chain = hammer2_chain_scan(parent, NULL, &cache_index, 1851 HAMMER2_LOOKUP_NODATA); 1852 while (chain) { 1853 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 1854 if (chain->bref.mirror_tid > sync_tid) { 1855 ++info->depth; 1856 error = hammer2_recovery_scan(hmp, chain, 1857 info, sync_tid); 1858 --info->depth; 1859 if (error) 1860 cumulative_error = error; 1861 } 1862 1863 /* 1864 * Flush the recovery at the PFS boundary to stage it for 1865 * the final flush of the super-root topology. 1866 */ 1867 if ((chain->bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 1868 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 1869 hammer2_flush(chain, info->mtid, 1); 1870 } 1871 chain = hammer2_chain_scan(parent, chain, &cache_index, 1872 HAMMER2_LOOKUP_NODATA); 1873 } 1874 1875 return cumulative_error; 1876 } 1877 1878 /* 1879 * Sync a mount point; this is called on a per-mount basis from the 1880 * filesystem syncer process periodically and whenever a user issues 1881 * a sync. 1882 */ 1883 int 1884 hammer2_vfs_sync(struct mount *mp, int waitfor) 1885 { 1886 hammer2_xop_flush_t *xop; 1887 struct hammer2_sync_info info; 1888 hammer2_inode_t *iroot; 1889 hammer2_pfs_t *pmp; 1890 int flags; 1891 int error; 1892 1893 pmp = MPTOPMP(mp); 1894 iroot = pmp->iroot; 1895 KKASSERT(iroot); 1896 KKASSERT(iroot->pmp == pmp); 1897 1898 /* 1899 * We can't acquire locks on existing vnodes while in a transaction 1900 * without risking a deadlock. This assumes that vfsync() can be 1901 * called without the vnode locked (which it can in DragonFly). 1902 * Otherwise we'd have to implement a multi-pass or flag the lock 1903 * failures and retry. 1904 * 1905 * The reclamation code interlocks with the sync list's token 1906 * (by removing the vnode from the scan list) before unlocking 1907 * the inode, giving us time to ref the inode. 1908 */ 1909 /*flags = VMSC_GETVP;*/ 1910 flags = 0; 1911 if (waitfor & MNT_LAZY) 1912 flags |= VMSC_ONEPASS; 1913 1914 #if 0 1915 /* 1916 * Preflush the vnodes using a normal transaction before interlocking 1917 * with a flush transaction. 1918 */ 1919 hammer2_trans_init(pmp, 0); 1920 info.error = 0; 1921 info.waitfor = MNT_NOWAIT; 1922 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 1923 hammer2_trans_done(pmp); 1924 #endif 1925 1926 /* 1927 * Start our flush transaction. This does not return until all 1928 * concurrent transactions have completed and will prevent any 1929 * new transactions from running concurrently, except for the 1930 * buffer cache transactions. 1931 * 1932 * For efficiency do an async pass before making sure with a 1933 * synchronous pass on all related buffer cache buffers. It 1934 * should theoretically not be possible for any new file buffers 1935 * to be instantiated during this sequence. 1936 */ 1937 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH | 1938 HAMMER2_TRANS_PREFLUSH); 1939 hammer2_inode_run_unlinkq(pmp); 1940 1941 info.error = 0; 1942 info.waitfor = MNT_NOWAIT; 1943 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 1944 info.waitfor = MNT_WAIT; 1945 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 1946 1947 /* 1948 * Clear PREFLUSH. This prevents (or asserts on) any new logical 1949 * buffer cache flushes which occur during the flush. Device buffers 1950 * are not affected. 1951 */ 1952 hammer2_bioq_sync(pmp); 1953 hammer2_trans_clear_preflush(pmp); 1954 1955 /* 1956 * Use the XOP interface to concurrently flush all nodes to 1957 * synchronize the PFSROOT subtopology to the media. A standard 1958 * end-of-scan ENOENT error indicates cluster sufficiency. 1959 * 1960 * Note that this flush will not be visible on crash recovery until 1961 * we flush the super-root topology in the next loop. 1962 * 1963 * XXX For now wait for all flushes to complete. 1964 */ 1965 if (iroot) { 1966 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 1967 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 1968 error = hammer2_xop_collect(&xop->head, 1969 HAMMER2_XOP_COLLECT_WAITALL); 1970 if (error == ENOENT) 1971 error = 0; 1972 } else { 1973 error = 0; 1974 } 1975 hammer2_trans_done(pmp); 1976 1977 return (error); 1978 } 1979 1980 /* 1981 * Sync passes. 1982 * 1983 * Note that we ignore the tranasction mtid we got above. Instead, 1984 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 1985 * transactions. 1986 */ 1987 static int 1988 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1989 { 1990 struct hammer2_sync_info *info = data; 1991 hammer2_inode_t *ip; 1992 int error; 1993 1994 /* 1995 * Degenerate cases. Note that ip == NULL typically means the 1996 * syncer vnode itself and we don't want to vclrisdirty() in that 1997 * situation. 1998 */ 1999 ip = VTOI(vp); 2000 if (ip == NULL) { 2001 return(0); 2002 } 2003 if (vp->v_type == VNON || vp->v_type == VBAD) { 2004 vclrisdirty(vp); 2005 return(0); 2006 } 2007 2008 /* 2009 * VOP_FSYNC will start a new transaction so replicate some code 2010 * here to do it inline (see hammer2_vop_fsync()). 2011 * 2012 * WARNING: The vfsync interacts with the buffer cache and might 2013 * block, we can't hold the inode lock at that time. 2014 * However, we MUST ref ip before blocking to ensure that 2015 * it isn't ripped out from under us (since we do not 2016 * hold a lock on the vnode). 2017 */ 2018 hammer2_inode_ref(ip); 2019 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2020 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2021 vfsync(vp, info->waitfor, 1, NULL, NULL); 2022 hammer2_inode_fsync(ip); 2023 } 2024 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2025 RB_EMPTY(&vp->v_rbdirty_tree)) { 2026 vclrisdirty(vp); 2027 } 2028 2029 hammer2_inode_drop(ip); 2030 #if 1 2031 error = 0; 2032 if (error) 2033 info->error = error; 2034 #endif 2035 return(0); 2036 } 2037 2038 static 2039 int 2040 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2041 { 2042 return (0); 2043 } 2044 2045 static 2046 int 2047 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2048 struct fid *fhp, struct vnode **vpp) 2049 { 2050 return (0); 2051 } 2052 2053 static 2054 int 2055 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2056 int *exflagsp, struct ucred **credanonp) 2057 { 2058 return (0); 2059 } 2060 2061 /* 2062 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2063 * header into the HMP 2064 * 2065 * XXX read four volhdrs and use the one with the highest TID whos CRC 2066 * matches. 2067 * 2068 * XXX check iCRCs. 2069 * 2070 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2071 * nonexistant locations. 2072 * 2073 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2074 */ 2075 static 2076 int 2077 hammer2_install_volume_header(hammer2_dev_t *hmp) 2078 { 2079 hammer2_volume_data_t *vd; 2080 struct buf *bp; 2081 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2082 int error_reported; 2083 int error; 2084 int valid; 2085 int i; 2086 2087 error_reported = 0; 2088 error = 0; 2089 valid = 0; 2090 bp = NULL; 2091 2092 /* 2093 * There are up to 4 copies of the volume header (syncs iterate 2094 * between them so there is no single master). We don't trust the 2095 * volu_size field so we don't know precisely how large the filesystem 2096 * is, so depend on the OS to return an error if we go beyond the 2097 * block device's EOF. 2098 */ 2099 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2100 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2101 HAMMER2_VOLUME_BYTES, &bp); 2102 if (error) { 2103 brelse(bp); 2104 bp = NULL; 2105 continue; 2106 } 2107 2108 vd = (struct hammer2_volume_data *) bp->b_data; 2109 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2110 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2111 brelse(bp); 2112 bp = NULL; 2113 continue; 2114 } 2115 2116 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2117 /* XXX: Reversed-endianness filesystem */ 2118 kprintf("hammer2: reverse-endian filesystem detected"); 2119 brelse(bp); 2120 bp = NULL; 2121 continue; 2122 } 2123 2124 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2125 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2126 HAMMER2_VOLUME_ICRC0_SIZE); 2127 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2128 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2129 HAMMER2_VOLUME_ICRC1_SIZE); 2130 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2131 kprintf("hammer2 volume header crc " 2132 "mismatch copy #%d %08x/%08x\n", 2133 i, crc0, crc); 2134 error_reported = 1; 2135 brelse(bp); 2136 bp = NULL; 2137 continue; 2138 } 2139 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2140 valid = 1; 2141 hmp->voldata = *vd; 2142 hmp->volhdrno = i; 2143 } 2144 brelse(bp); 2145 bp = NULL; 2146 } 2147 if (valid) { 2148 hmp->volsync = hmp->voldata; 2149 error = 0; 2150 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2151 kprintf("hammer2: using volume header #%d\n", 2152 hmp->volhdrno); 2153 } 2154 } else { 2155 error = EINVAL; 2156 kprintf("hammer2: no valid volume headers found!\n"); 2157 } 2158 return (error); 2159 } 2160 2161 /* 2162 * This handles hysteresis on regular file flushes. Because the BIOs are 2163 * routed to a thread it is possible for an excessive number to build up 2164 * and cause long front-end stalls long before the runningbuffspace limit 2165 * is hit, so we implement hammer2_flush_pipe to control the 2166 * hysteresis. 2167 * 2168 * This is a particular problem when compression is used. 2169 */ 2170 void 2171 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2172 { 2173 atomic_add_int(&pmp->count_lwinprog, 1); 2174 } 2175 2176 void 2177 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2178 { 2179 int lwinprog; 2180 2181 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2182 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2183 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2184 atomic_clear_int(&pmp->count_lwinprog, 2185 HAMMER2_LWINPROG_WAITING); 2186 wakeup(&pmp->count_lwinprog); 2187 } 2188 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2189 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2190 atomic_clear_int(&pmp->count_lwinprog, 2191 HAMMER2_LWINPROG_WAITING0); 2192 wakeup(&pmp->count_lwinprog); 2193 } 2194 } 2195 2196 void 2197 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2198 { 2199 int lwinprog; 2200 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2201 HAMMER2_LWINPROG_WAITING0; 2202 2203 for (;;) { 2204 lwinprog = pmp->count_lwinprog; 2205 cpu_ccfence(); 2206 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2207 break; 2208 tsleep_interlock(&pmp->count_lwinprog, 0); 2209 atomic_set_int(&pmp->count_lwinprog, lwflag); 2210 lwinprog = pmp->count_lwinprog; 2211 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2212 break; 2213 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2214 } 2215 } 2216 2217 /* 2218 * Manage excessive memory resource use for chain and related 2219 * structures. 2220 */ 2221 void 2222 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2223 { 2224 uint32_t waiting; 2225 uint32_t count; 2226 uint32_t limit; 2227 #if 0 2228 static int zzticks; 2229 #endif 2230 2231 /* 2232 * Atomic check condition and wait. Also do an early speedup of 2233 * the syncer to try to avoid hitting the wait. 2234 */ 2235 for (;;) { 2236 waiting = pmp->inmem_dirty_chains; 2237 cpu_ccfence(); 2238 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2239 2240 limit = pmp->mp->mnt_nvnodelistsize / 10; 2241 if (limit < hammer2_limit_dirty_chains) 2242 limit = hammer2_limit_dirty_chains; 2243 if (limit < 1000) 2244 limit = 1000; 2245 2246 #if 0 2247 if ((int)(ticks - zzticks) > hz) { 2248 zzticks = ticks; 2249 kprintf("count %ld %ld\n", count, limit); 2250 } 2251 #endif 2252 2253 /* 2254 * Block if there are too many dirty chains present, wait 2255 * for the flush to clean some out. 2256 */ 2257 if (count > limit) { 2258 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2259 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2260 waiting, 2261 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2262 speedup_syncer(pmp->mp); 2263 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2264 "chnmem", hz); 2265 } 2266 continue; /* loop on success or fail */ 2267 } 2268 2269 /* 2270 * Try to start an early flush before we are forced to block. 2271 */ 2272 if (count > limit * 7 / 10) 2273 speedup_syncer(pmp->mp); 2274 break; 2275 } 2276 } 2277 2278 void 2279 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2280 { 2281 if (pmp) { 2282 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2283 } 2284 } 2285 2286 void 2287 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2288 { 2289 uint32_t waiting; 2290 2291 if (pmp == NULL) 2292 return; 2293 2294 for (;;) { 2295 waiting = pmp->inmem_dirty_chains; 2296 cpu_ccfence(); 2297 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2298 waiting, 2299 (waiting - 1) & 2300 ~HAMMER2_DIRTYCHAIN_WAITING)) { 2301 break; 2302 } 2303 } 2304 2305 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) 2306 wakeup(&pmp->inmem_dirty_chains); 2307 } 2308 2309 /* 2310 * Debugging 2311 */ 2312 void 2313 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2314 { 2315 hammer2_chain_t *scan; 2316 hammer2_chain_t *parent; 2317 2318 --*countp; 2319 if (*countp == 0) { 2320 kprintf("%*.*s...\n", tab, tab, ""); 2321 return; 2322 } 2323 if (*countp < 0) 2324 return; 2325 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2326 tab, tab, "", pfx, 2327 chain, chain->bref.type, 2328 chain->bref.key, chain->bref.keybits, 2329 chain->bref.mirror_tid); 2330 2331 kprintf("%*.*s [%08x] (%s) refs=%d", 2332 tab, tab, "", 2333 chain->flags, 2334 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2335 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2336 chain->refs); 2337 2338 parent = chain->parent; 2339 if (parent) 2340 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2341 tab, tab, "", 2342 parent, parent->flags, parent->refs); 2343 if (RB_EMPTY(&chain->core.rbtree)) { 2344 kprintf("\n"); 2345 } else { 2346 kprintf(" {\n"); 2347 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2348 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2349 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2350 kprintf("%*.*s}(%s)\n", tab, tab, "", 2351 chain->data->ipdata.filename); 2352 else 2353 kprintf("%*.*s}\n", tab, tab, ""); 2354 } 2355 } 2356