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 static struct hammer2_mntlist hammer2_mntlist; 76 77 struct hammer2_pfslist hammer2_pfslist; 78 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, VFCF_MPSAFE); 228 MODULE_VERSION(hammer2, 1); 229 230 static 231 int 232 hammer2_vfs_init(struct vfsconf *conf) 233 { 234 static struct objcache_malloc_args margs_read; 235 static struct objcache_malloc_args margs_write; 236 static struct objcache_malloc_args margs_vop; 237 238 int error; 239 240 error = 0; 241 242 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 243 error = EINVAL; 244 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 245 error = EINVAL; 246 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 247 error = EINVAL; 248 249 if (error) 250 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 251 252 margs_read.objsize = 65536; 253 margs_read.mtype = M_HAMMER2_DEBUFFER; 254 255 margs_write.objsize = 32768; 256 margs_write.mtype = M_HAMMER2_CBUFFER; 257 258 margs_vop.objsize = sizeof(hammer2_xop_t); 259 margs_vop.mtype = M_HAMMER2; 260 261 /* 262 * Note thaht for the XOPS cache we want backing store allocations 263 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 264 * confusion), so use the backing store function that does it. This 265 * means that initial XOPS objects are zerod but REUSED objects are 266 * not. So we are responsible for cleaning the object up sufficiently 267 * for our needs before objcache_put()ing it back (typically just the 268 * FIFO indices). 269 */ 270 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 271 0, 1, NULL, NULL, NULL, 272 objcache_malloc_alloc, 273 objcache_malloc_free, 274 &margs_read); 275 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 276 0, 1, NULL, NULL, NULL, 277 objcache_malloc_alloc, 278 objcache_malloc_free, 279 &margs_write); 280 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 281 0, 1, NULL, NULL, NULL, 282 objcache_malloc_alloc_zero, 283 objcache_malloc_free, 284 &margs_vop); 285 286 287 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 288 TAILQ_INIT(&hammer2_mntlist); 289 TAILQ_INIT(&hammer2_pfslist); 290 291 hammer2_limit_dirty_chains = maxvnodes / 10; 292 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 293 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 294 295 return (error); 296 } 297 298 static 299 int 300 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 301 { 302 objcache_destroy(cache_buffer_read); 303 objcache_destroy(cache_buffer_write); 304 objcache_destroy(cache_xops); 305 return 0; 306 } 307 308 /* 309 * Core PFS allocator. Used to allocate or reference the pmp structure 310 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 311 * The pmp can be passed in or loaded by this function using the chain and 312 * inode data. 313 * 314 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 315 * transactions. Note that synchronization does not use this field. 316 * (typically frontend operations and synchronization cannot run on the 317 * same PFS node at the same time). 318 * 319 * XXX check locking 320 */ 321 hammer2_pfs_t * 322 hammer2_pfsalloc(hammer2_chain_t *chain, 323 const hammer2_inode_data_t *ripdata, 324 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 325 { 326 hammer2_pfs_t *pmp; 327 hammer2_inode_t *iroot; 328 int count; 329 int i; 330 int j; 331 332 pmp = NULL; 333 334 /* 335 * Locate or create the PFS based on the cluster id. If ripdata 336 * is NULL this is a spmp which is unique and is always allocated. 337 * 338 * If the device is mounted in local mode all PFSs are considered 339 * independent and not part of any cluster (for debugging only). 340 */ 341 if (ripdata) { 342 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 343 if (force_local != pmp->force_local) 344 continue; 345 if (force_local == NULL && 346 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 347 sizeof(pmp->pfs_clid)) == 0) { 348 break; 349 } else if (force_local && pmp->pfs_names[0] && 350 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 351 break; 352 } 353 } 354 } 355 356 if (pmp == NULL) { 357 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 358 pmp->force_local = force_local; 359 hammer2_trans_manage_init(pmp); 360 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 361 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 362 lockinit(&pmp->lock, "pfslk", 0, 0); 363 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 364 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 365 spin_init(&pmp->xop_spin, "h2xop"); 366 spin_init(&pmp->lru_spin, "h2lru"); 367 RB_INIT(&pmp->inum_tree); 368 TAILQ_INIT(&pmp->sideq); 369 TAILQ_INIT(&pmp->lru_list); 370 spin_init(&pmp->list_spin, "hm2pfsalloc_list"); 371 372 /* 373 * Distribute backend operations to threads 374 */ 375 for (i = 0; i < HAMMER2_XOPGROUPS; ++i) 376 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]); 377 378 /* 379 * Save the last media transaction id for the flusher. Set 380 * initial 381 */ 382 if (ripdata) 383 pmp->pfs_clid = ripdata->meta.pfs_clid; 384 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 385 386 /* 387 * The synchronization thread may start too early, make 388 * sure it stays frozen until we are ready to let it go. 389 * XXX 390 */ 391 /* 392 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 393 HAMMER2_THREAD_REMASTER; 394 */ 395 } 396 397 /* 398 * Create the PFS's root inode and any missing XOP helper threads. 399 */ 400 if ((iroot = pmp->iroot) == NULL) { 401 iroot = hammer2_inode_get(pmp, NULL, NULL, -1); 402 if (ripdata) 403 iroot->meta = ripdata->meta; 404 pmp->iroot = iroot; 405 hammer2_inode_ref(iroot); 406 hammer2_inode_unlock(iroot); 407 } 408 409 /* 410 * Stop here if no chain is passed in. 411 */ 412 if (chain == NULL) 413 goto done; 414 415 /* 416 * When a chain is passed in we must add it to the PFS's root 417 * inode, update pmp->pfs_types[], and update the syncronization 418 * threads. 419 * 420 * When forcing local mode, mark the PFS as a MASTER regardless. 421 * 422 * At the moment empty spots can develop due to removals or failures. 423 * Ultimately we want to re-fill these spots but doing so might 424 * confused running code. XXX 425 */ 426 hammer2_inode_ref(iroot); 427 hammer2_mtx_ex(&iroot->lock); 428 j = iroot->cluster.nchains; 429 430 kprintf("add PFS to pmp %p[%d]\n", pmp, j); 431 432 if (j == HAMMER2_MAXCLUSTER) { 433 kprintf("hammer2_mount: cluster full!\n"); 434 /* XXX fatal error? */ 435 } else { 436 KKASSERT(chain->pmp == NULL); 437 chain->pmp = pmp; 438 hammer2_chain_ref(chain); 439 iroot->cluster.array[j].chain = chain; 440 if (force_local) 441 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 442 else 443 pmp->pfs_types[j] = ripdata->meta.pfs_type; 444 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 445 pmp->pfs_hmps[j] = chain->hmp; 446 447 /* 448 * If the PFS is already mounted we must account 449 * for the mount_count here. 450 */ 451 if (pmp->mp) 452 ++chain->hmp->mount_count; 453 454 /* 455 * May have to fixup dirty chain tracking. Previous 456 * pmp was NULL so nothing to undo. 457 */ 458 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 459 hammer2_pfs_memory_inc(pmp); 460 ++j; 461 } 462 iroot->cluster.nchains = j; 463 464 /* 465 * Update nmasters from any PFS inode which is part of the cluster. 466 * It is possible that this will result in a value which is too 467 * high. MASTER PFSs are authoritative for pfs_nmasters and will 468 * override this value later on. 469 * 470 * (This informs us of masters that might not currently be 471 * discoverable by this mount). 472 */ 473 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 474 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 475 } 476 477 /* 478 * Count visible masters. Masters are usually added with 479 * ripdata->meta.pfs_nmasters set to 1. This detects when there 480 * are more (XXX and must update the master inodes). 481 */ 482 count = 0; 483 for (i = 0; i < iroot->cluster.nchains; ++i) { 484 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 485 ++count; 486 } 487 if (pmp->pfs_nmasters < count) 488 pmp->pfs_nmasters = count; 489 490 /* 491 * Create missing synchronization and support threads. 492 * 493 * Single-node masters (including snapshots) have nothing to 494 * synchronize and do not require this thread. 495 * 496 * Multi-node masters or any number of soft masters, slaves, copy, 497 * or other PFS types need the thread. 498 * 499 * Each thread is responsible for its particular cluster index. 500 * We use independent threads so stalls or mismatches related to 501 * any given target do not affect other targets. 502 */ 503 for (i = 0; i < iroot->cluster.nchains; ++i) { 504 /* 505 * Single-node masters (including snapshots) have nothing 506 * to synchronize and will make direct xops support calls, 507 * thus they do not require this thread. 508 * 509 * Note that there can be thousands of snapshots. We do not 510 * want to create thousands of threads. 511 */ 512 if (pmp->pfs_nmasters <= 1 && 513 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 514 continue; 515 } 516 517 /* 518 * Sync support thread 519 */ 520 if (pmp->sync_thrs[i].td == NULL) { 521 hammer2_thr_create(&pmp->sync_thrs[i], pmp, 522 "h2nod", i, -1, 523 hammer2_primary_sync_thread); 524 } 525 } 526 527 /* 528 * Create missing Xop threads 529 * 530 * NOTE: We create helper threads for all mounted PFSs or any 531 * PFSs with 2+ nodes (so the sync thread can update them, 532 * even if not mounted). 533 */ 534 if (pmp->mp || iroot->cluster.nchains >= 2) 535 hammer2_xop_helper_create(pmp); 536 537 hammer2_mtx_unlock(&iroot->lock); 538 hammer2_inode_drop(iroot); 539 done: 540 return pmp; 541 } 542 543 /* 544 * Deallocate an element of a probed PFS. If destroying and this is a 545 * MASTER, adjust nmasters. 546 * 547 * This function does not physically destroy the PFS element in its device 548 * under the super-root (see hammer2_ioctl_pfs_delete()). 549 */ 550 void 551 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 552 { 553 hammer2_inode_t *iroot; 554 hammer2_chain_t *chain; 555 int j; 556 557 /* 558 * Cleanup our reference on iroot. iroot is (should) not be needed 559 * by the flush code. 560 */ 561 iroot = pmp->iroot; 562 if (iroot) { 563 /* 564 * Stop synchronizing 565 * 566 * XXX flush after acquiring the iroot lock. 567 * XXX clean out the cluster index from all inode structures. 568 */ 569 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 570 571 /* 572 * Remove the cluster index from the group. If destroying 573 * the PFS and this is a master, adjust pfs_nmasters. 574 */ 575 hammer2_mtx_ex(&iroot->lock); 576 chain = iroot->cluster.array[clindex].chain; 577 iroot->cluster.array[clindex].chain = NULL; 578 579 switch(pmp->pfs_types[clindex]) { 580 case HAMMER2_PFSTYPE_MASTER: 581 if (destroying && pmp->pfs_nmasters > 0) 582 --pmp->pfs_nmasters; 583 /* XXX adjust ripdata->meta.pfs_nmasters */ 584 break; 585 default: 586 break; 587 } 588 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 589 590 hammer2_mtx_unlock(&iroot->lock); 591 592 /* 593 * Release the chain. 594 */ 595 if (chain) { 596 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 597 hammer2_chain_drop(chain); 598 } 599 600 /* 601 * Terminate all XOP threads for the cluster index. 602 */ 603 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 604 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]); 605 } 606 } 607 608 /* 609 * Destroy a PFS, typically only occurs after the last mount on a device 610 * has gone away. 611 */ 612 static void 613 hammer2_pfsfree(hammer2_pfs_t *pmp) 614 { 615 hammer2_inode_t *iroot; 616 hammer2_chain_t *chain; 617 int i; 618 int j; 619 620 /* 621 * Cleanup our reference on iroot. iroot is (should) not be needed 622 * by the flush code. 623 */ 624 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 625 626 iroot = pmp->iroot; 627 if (iroot) { 628 for (i = 0; i < iroot->cluster.nchains; ++i) { 629 hammer2_thr_delete(&pmp->sync_thrs[i]); 630 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 631 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 632 } 633 #if REPORT_REFS_ERRORS 634 if (pmp->iroot->refs != 1) 635 kprintf("PMP->IROOT %p REFS WRONG %d\n", 636 pmp->iroot, pmp->iroot->refs); 637 #else 638 KKASSERT(pmp->iroot->refs == 1); 639 #endif 640 /* ref for pmp->iroot */ 641 hammer2_inode_drop(pmp->iroot); 642 pmp->iroot = NULL; 643 } 644 645 /* 646 * Cleanup chains remaining on LRU list. 647 */ 648 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count); 649 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 650 hammer2_chain_ref(chain); 651 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 652 hammer2_chain_drop(chain); 653 } 654 655 /* 656 * Free remaining pmp resources 657 */ 658 kmalloc_destroy(&pmp->mmsg); 659 kmalloc_destroy(&pmp->minode); 660 661 kfree(pmp, M_HAMMER2); 662 } 663 664 /* 665 * Remove all references to hmp from the pfs list. Any PFS which becomes 666 * empty is terminated and freed. 667 * 668 * XXX inefficient. 669 */ 670 static void 671 hammer2_pfsfree_scan(hammer2_dev_t *hmp) 672 { 673 hammer2_pfs_t *pmp; 674 hammer2_inode_t *iroot; 675 hammer2_chain_t *rchain; 676 int didfreeze; 677 int i; 678 int j; 679 680 again: 681 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 682 if ((iroot = pmp->iroot) == NULL) 683 continue; 684 if (hmp->spmp == pmp) { 685 kprintf("unmount hmp %p remove spmp %p\n", 686 hmp, pmp); 687 hmp->spmp = NULL; 688 } 689 690 /* 691 * Determine if this PFS is affected. If it is we must 692 * freeze all management threads and lock its iroot. 693 * 694 * Freezing a management thread forces it idle, operations 695 * in-progress will be aborted and it will have to start 696 * over again when unfrozen, or exit if told to exit. 697 */ 698 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 699 if (pmp->pfs_hmps[i] == hmp) 700 break; 701 } 702 if (i != HAMMER2_MAXCLUSTER) { 703 /* 704 * Make sure all synchronization threads are locked 705 * down. 706 */ 707 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 708 if (pmp->pfs_hmps[i] == NULL) 709 continue; 710 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 711 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 712 hammer2_thr_freeze_async( 713 &pmp->xop_groups[j].thrs[i]); 714 } 715 } 716 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 717 if (pmp->pfs_hmps[i] == NULL) 718 continue; 719 hammer2_thr_freeze(&pmp->sync_thrs[i]); 720 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 721 hammer2_thr_freeze( 722 &pmp->xop_groups[j].thrs[i]); 723 } 724 } 725 726 /* 727 * Lock the inode and clean out matching chains. 728 * Note that we cannot use hammer2_inode_lock_*() 729 * here because that would attempt to validate the 730 * cluster that we are in the middle of ripping 731 * apart. 732 * 733 * WARNING! We are working directly on the inodes 734 * embedded cluster. 735 */ 736 hammer2_mtx_ex(&iroot->lock); 737 738 /* 739 * Remove the chain from matching elements of the PFS. 740 */ 741 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 742 if (pmp->pfs_hmps[i] != hmp) 743 continue; 744 hammer2_thr_delete(&pmp->sync_thrs[i]); 745 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 746 hammer2_thr_delete( 747 &pmp->xop_groups[j].thrs[i]); 748 } 749 rchain = iroot->cluster.array[i].chain; 750 iroot->cluster.array[i].chain = NULL; 751 pmp->pfs_types[i] = 0; 752 if (pmp->pfs_names[i]) { 753 kfree(pmp->pfs_names[i], M_HAMMER2); 754 pmp->pfs_names[i] = NULL; 755 } 756 if (rchain) { 757 hammer2_chain_drop(rchain); 758 /* focus hint */ 759 if (iroot->cluster.focus == rchain) 760 iroot->cluster.focus = NULL; 761 } 762 pmp->pfs_hmps[i] = NULL; 763 } 764 hammer2_mtx_unlock(&iroot->lock); 765 didfreeze = 1; /* remaster, unfreeze down below */ 766 } else { 767 didfreeze = 0; 768 } 769 770 /* 771 * Cleanup trailing chains. Gaps may remain. 772 */ 773 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 774 if (pmp->pfs_hmps[i]) 775 break; 776 } 777 iroot->cluster.nchains = i + 1; 778 779 /* 780 * If the PMP has no elements remaining we can destroy it. 781 * (this will transition management threads from frozen->exit). 782 */ 783 if (iroot->cluster.nchains == 0) { 784 kprintf("unmount hmp %p last ref to PMP=%p\n", 785 hmp, pmp); 786 hammer2_pfsfree(pmp); 787 goto again; 788 } 789 790 /* 791 * If elements still remain we need to set the REMASTER 792 * flag and unfreeze it. 793 */ 794 if (didfreeze) { 795 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 796 if (pmp->pfs_hmps[i] == NULL) 797 continue; 798 hammer2_thr_remaster(&pmp->sync_thrs[i]); 799 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 800 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 801 hammer2_thr_remaster( 802 &pmp->xop_groups[j].thrs[i]); 803 hammer2_thr_unfreeze( 804 &pmp->xop_groups[j].thrs[i]); 805 } 806 } 807 } 808 } 809 } 810 811 /* 812 * Mount or remount HAMMER2 fileystem from physical media 813 * 814 * mountroot 815 * mp mount point structure 816 * path NULL 817 * data <unused> 818 * cred <unused> 819 * 820 * mount 821 * mp mount point structure 822 * path path to mount point 823 * data pointer to argument structure in user space 824 * volume volume path (device@LABEL form) 825 * hflags user mount flags 826 * cred user credentials 827 * 828 * RETURNS: 0 Success 829 * !0 error number 830 */ 831 static 832 int 833 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 834 struct ucred *cred) 835 { 836 struct hammer2_mount_info info; 837 hammer2_pfs_t *pmp; 838 hammer2_pfs_t *spmp; 839 hammer2_dev_t *hmp; 840 hammer2_dev_t *force_local; 841 hammer2_key_t key_next; 842 hammer2_key_t key_dummy; 843 hammer2_key_t lhc; 844 struct vnode *devvp; 845 struct nlookupdata nd; 846 hammer2_chain_t *parent; 847 hammer2_chain_t *chain; 848 hammer2_cluster_t *cluster; 849 const hammer2_inode_data_t *ripdata; 850 hammer2_blockref_t bref; 851 struct file *fp; 852 char devstr[MNAMELEN]; 853 size_t size; 854 size_t done; 855 char *dev; 856 char *label; 857 int ronly = 1; 858 int error; 859 int cache_index; 860 int i; 861 862 hmp = NULL; 863 pmp = NULL; 864 dev = NULL; 865 label = NULL; 866 devvp = NULL; 867 cache_index = -1; 868 869 kprintf("hammer2_mount\n"); 870 871 if (path == NULL) { 872 /* 873 * Root mount 874 */ 875 bzero(&info, sizeof(info)); 876 info.cluster_fd = -1; 877 ksnprintf(devstr, sizeof(devstr), "%s", 878 mp->mnt_stat.f_mntfromname); 879 kprintf("hammer2_mount: root '%s'\n", devstr); 880 } else { 881 /* 882 * Non-root mount or updating a mount 883 */ 884 error = copyin(data, &info, sizeof(info)); 885 if (error) 886 return (error); 887 888 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 889 if (error) 890 return (error); 891 } 892 893 /* 894 * Extract device and label, automatically mount @LOCAL if no 895 * label specified. 896 */ 897 dev = devstr; 898 label = strchr(devstr, '@'); 899 if (label && ((label + 1) - dev) > done) 900 return (EINVAL); 901 if (label == NULL || label[1] == 0) { 902 label = "LOCAL"; /* not modified after this point */ 903 } else { 904 *label = '\0'; 905 label++; 906 } 907 908 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\"\n", 909 dev, label); 910 911 if (mp->mnt_flag & MNT_UPDATE) { 912 /* 913 * Update mount. Note that pmp->iroot->cluster is 914 * an inode-embedded cluster and thus cannot be 915 * directly locked. 916 * 917 * XXX HAMMER2 needs to implement NFS export via 918 * mountctl. 919 */ 920 pmp = MPTOPMP(mp); 921 pmp->hflags = info.hflags; 922 cluster = &pmp->iroot->cluster; 923 for (i = 0; i < cluster->nchains; ++i) { 924 if (cluster->array[i].chain == NULL) 925 continue; 926 hmp = cluster->array[i].chain->hmp; 927 devvp = hmp->devvp; 928 error = hammer2_remount(hmp, mp, path, 929 devvp, cred); 930 if (error) 931 break; 932 } 933 934 return error; 935 } 936 937 /* 938 * HMP device mount 939 * 940 * If a path is specified and dev is not an empty string, lookup the 941 * name and verify that it referes to a block device. 942 * 943 * If a path is specified and dev is an empty string we fall through 944 * and locate the label in the hmp search. 945 */ 946 if (path && *dev != 0) { 947 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 948 if (error == 0) 949 error = nlookup(&nd); 950 if (error == 0) 951 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 952 nlookup_done(&nd); 953 } else if (path == NULL) { 954 /* root mount */ 955 cdev_t cdev = kgetdiskbyname(dev); 956 error = bdevvp(cdev, &devvp); 957 if (error) 958 kprintf("hammer2: cannot find '%s'\n", dev); 959 } else { 960 /* 961 * We will locate the hmp using the label in the hmp loop. 962 */ 963 error = 0; 964 } 965 966 if (error == 0 && devvp) { 967 if (vn_isdisk(devvp, &error)) 968 error = vfs_mountedon(devvp); 969 } 970 971 /* 972 * Determine if the device has already been mounted. After this 973 * check hmp will be non-NULL if we are doing the second or more 974 * hammer2 mounts from the same device. 975 */ 976 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 977 if (devvp) { 978 /* 979 * Match the device 980 */ 981 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 982 if (hmp->devvp == devvp) 983 break; 984 } 985 } else if (error == 0) { 986 /* 987 * Match the label to a pmp already probed. 988 */ 989 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 990 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 991 if (pmp->pfs_names[i] && 992 strcmp(pmp->pfs_names[i], label) == 0) { 993 hmp = pmp->pfs_hmps[i]; 994 break; 995 } 996 } 997 if (hmp) 998 break; 999 } 1000 if (hmp == NULL) 1001 error = ENOENT; 1002 } 1003 1004 /* 1005 * Open the device if this isn't a secondary mount and construct 1006 * the H2 device mount (hmp). 1007 */ 1008 if (hmp == NULL) { 1009 hammer2_chain_t *schain; 1010 hammer2_xid_t xid; 1011 1012 if (error == 0 && vcount(devvp) > 0) 1013 error = EBUSY; 1014 1015 /* 1016 * Now open the device 1017 */ 1018 if (error == 0) { 1019 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1020 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1021 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1022 if (error == 0) { 1023 error = VOP_OPEN(devvp, 1024 ronly ? FREAD : FREAD | FWRITE, 1025 FSCRED, NULL); 1026 } 1027 vn_unlock(devvp); 1028 } 1029 if (error && devvp) { 1030 vrele(devvp); 1031 devvp = NULL; 1032 } 1033 if (error) { 1034 lockmgr(&hammer2_mntlk, LK_RELEASE); 1035 return error; 1036 } 1037 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1038 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1039 hmp->ronly = ronly; 1040 hmp->devvp = devvp; 1041 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1042 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1043 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1044 RB_INIT(&hmp->iotree); 1045 spin_init(&hmp->io_spin, "hm2mount_io"); 1046 spin_init(&hmp->list_spin, "hm2mount_list"); 1047 TAILQ_INIT(&hmp->flushq); 1048 1049 lockinit(&hmp->vollk, "h2vol", 0, 0); 1050 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1051 1052 /* 1053 * vchain setup. vchain.data is embedded. 1054 * vchain.refs is initialized and will never drop to 0. 1055 * 1056 * NOTE! voldata is not yet loaded. 1057 */ 1058 hmp->vchain.hmp = hmp; 1059 hmp->vchain.refs = 1; 1060 hmp->vchain.data = (void *)&hmp->voldata; 1061 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1062 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1063 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1064 1065 hammer2_chain_core_init(&hmp->vchain); 1066 /* hmp->vchain.u.xxx is left NULL */ 1067 1068 /* 1069 * fchain setup. fchain.data is embedded. 1070 * fchain.refs is initialized and will never drop to 0. 1071 * 1072 * The data is not used but needs to be initialized to 1073 * pass assertion muster. We use this chain primarily 1074 * as a placeholder for the freemap's top-level RBTREE 1075 * so it does not interfere with the volume's topology 1076 * RBTREE. 1077 */ 1078 hmp->fchain.hmp = hmp; 1079 hmp->fchain.refs = 1; 1080 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1081 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1082 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1083 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1084 hmp->fchain.bref.methods = 1085 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1086 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1087 1088 hammer2_chain_core_init(&hmp->fchain); 1089 /* hmp->fchain.u.xxx is left NULL */ 1090 1091 /* 1092 * Install the volume header and initialize fields from 1093 * voldata. 1094 */ 1095 error = hammer2_install_volume_header(hmp); 1096 if (error) { 1097 hammer2_unmount_helper(mp, NULL, hmp); 1098 lockmgr(&hammer2_mntlk, LK_RELEASE); 1099 hammer2_vfs_unmount(mp, MNT_FORCE); 1100 return error; 1101 } 1102 1103 /* 1104 * Really important to get these right or flush will get 1105 * confused. 1106 */ 1107 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1108 kprintf("alloc spmp %p tid %016jx\n", 1109 hmp->spmp, hmp->voldata.mirror_tid); 1110 spmp = hmp->spmp; 1111 1112 /* 1113 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1114 * is inherited from the volume header. 1115 */ 1116 xid = 0; 1117 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1118 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1119 hmp->vchain.pmp = spmp; 1120 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1121 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1122 hmp->fchain.pmp = spmp; 1123 1124 /* 1125 * First locate the super-root inode, which is key 0 1126 * relative to the volume header's blockset. 1127 * 1128 * Then locate the root inode by scanning the directory keyspace 1129 * represented by the label. 1130 */ 1131 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1132 schain = hammer2_chain_lookup(&parent, &key_dummy, 1133 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1134 &cache_index, 0); 1135 hammer2_chain_lookup_done(parent); 1136 if (schain == NULL) { 1137 kprintf("hammer2_mount: invalid super-root\n"); 1138 hammer2_unmount_helper(mp, NULL, hmp); 1139 lockmgr(&hammer2_mntlk, LK_RELEASE); 1140 hammer2_vfs_unmount(mp, MNT_FORCE); 1141 return EINVAL; 1142 } 1143 if (schain->error) { 1144 kprintf("hammer2_mount: error %s reading super-root\n", 1145 hammer2_error_str(schain->error)); 1146 hammer2_chain_unlock(schain); 1147 hammer2_chain_drop(schain); 1148 schain = NULL; 1149 hammer2_unmount_helper(mp, NULL, hmp); 1150 lockmgr(&hammer2_mntlk, LK_RELEASE); 1151 hammer2_vfs_unmount(mp, MNT_FORCE); 1152 return EINVAL; 1153 } 1154 1155 /* 1156 * The super-root always uses an inode_tid of 1 when 1157 * creating PFSs. 1158 */ 1159 spmp->inode_tid = 1; 1160 spmp->modify_tid = schain->bref.modify_tid + 1; 1161 1162 /* 1163 * Sanity-check schain's pmp and finish initialization. 1164 * Any chain belonging to the super-root topology should 1165 * have a NULL pmp (not even set to spmp). 1166 */ 1167 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1168 KKASSERT(schain->pmp == NULL); 1169 spmp->pfs_clid = ripdata->meta.pfs_clid; 1170 1171 /* 1172 * Replace the dummy spmp->iroot with a real one. It's 1173 * easier to just do a wholesale replacement than to try 1174 * to update the chain and fixup the iroot fields. 1175 * 1176 * The returned inode is locked with the supplied cluster. 1177 */ 1178 cluster = hammer2_cluster_from_chain(schain); 1179 hammer2_inode_drop(spmp->iroot); 1180 spmp->iroot = NULL; 1181 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1182 spmp->spmp_hmp = hmp; 1183 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1184 spmp->pfs_hmps[0] = hmp; 1185 hammer2_inode_ref(spmp->iroot); 1186 hammer2_inode_unlock(spmp->iroot); 1187 hammer2_cluster_unlock(cluster); 1188 hammer2_cluster_drop(cluster); 1189 schain = NULL; 1190 /* leave spmp->iroot with one ref */ 1191 1192 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1193 error = hammer2_recovery(hmp); 1194 /* XXX do something with error */ 1195 } 1196 hammer2_update_pmps(hmp); 1197 hammer2_iocom_init(hmp); 1198 1199 /* 1200 * Ref the cluster management messaging descriptor. The mount 1201 * program deals with the other end of the communications pipe. 1202 * 1203 * Root mounts typically do not supply one. 1204 */ 1205 if (info.cluster_fd >= 0) { 1206 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1207 if (fp) { 1208 hammer2_cluster_reconnect(hmp, fp); 1209 } else { 1210 kprintf("hammer2_mount: bad cluster_fd!\n"); 1211 } 1212 } 1213 } else { 1214 spmp = hmp->spmp; 1215 if (info.hflags & HMNT2_DEVFLAGS) { 1216 kprintf("hammer2: Warning: mount flags pertaining " 1217 "to the whole device may only be specified " 1218 "on the first mount of the device: %08x\n", 1219 info.hflags & HMNT2_DEVFLAGS); 1220 } 1221 } 1222 1223 /* 1224 * Force local mount (disassociate all PFSs from their clusters). 1225 * Used primarily for debugging. 1226 */ 1227 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1228 1229 /* 1230 * Lookup the mount point under the media-localized super-root. 1231 * Scanning hammer2_pfslist doesn't help us because it represents 1232 * PFS cluster ids which can aggregate several named PFSs together. 1233 * 1234 * cluster->pmp will incorrectly point to spmp and must be fixed 1235 * up later on. 1236 */ 1237 hammer2_inode_lock(spmp->iroot, 0); 1238 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1239 lhc = hammer2_dirhash(label, strlen(label)); 1240 chain = hammer2_chain_lookup(&parent, &key_next, 1241 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1242 &cache_index, 0); 1243 while (chain) { 1244 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1245 strcmp(label, chain->data->ipdata.filename) == 0) { 1246 break; 1247 } 1248 chain = hammer2_chain_next(&parent, chain, &key_next, 1249 key_next, 1250 lhc + HAMMER2_DIRHASH_LOMASK, 1251 &cache_index, 0); 1252 } 1253 if (parent) { 1254 hammer2_chain_unlock(parent); 1255 hammer2_chain_drop(parent); 1256 } 1257 hammer2_inode_unlock(spmp->iroot); 1258 1259 /* 1260 * PFS could not be found? 1261 */ 1262 if (chain == NULL) { 1263 kprintf("hammer2_mount: PFS label not found\n"); 1264 hammer2_unmount_helper(mp, NULL, hmp); 1265 lockmgr(&hammer2_mntlk, LK_RELEASE); 1266 hammer2_vfs_unmount(mp, MNT_FORCE); 1267 1268 return EINVAL; 1269 } 1270 1271 /* 1272 * Acquire the pmp structure (it should have already been allocated 1273 * via hammer2_update_pmps() so do not pass cluster in to add to 1274 * available chains). 1275 * 1276 * Check if the cluster has already been mounted. A cluster can 1277 * only be mounted once, use null mounts to mount additional copies. 1278 */ 1279 ripdata = &chain->data->ipdata; 1280 bref = chain->bref; 1281 pmp = hammer2_pfsalloc(NULL, ripdata, 1282 bref.modify_tid, force_local); 1283 hammer2_chain_unlock(chain); 1284 hammer2_chain_drop(chain); 1285 1286 /* 1287 * Finish the mount 1288 */ 1289 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1290 1291 if (pmp->mp) { 1292 kprintf("hammer2_mount: PFS already mounted!\n"); 1293 hammer2_unmount_helper(mp, NULL, hmp); 1294 lockmgr(&hammer2_mntlk, LK_RELEASE); 1295 hammer2_vfs_unmount(mp, MNT_FORCE); 1296 1297 return EBUSY; 1298 } 1299 1300 pmp->hflags = info.hflags; 1301 mp->mnt_flag = MNT_LOCAL; 1302 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1303 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1304 1305 /* 1306 * required mount structure initializations 1307 */ 1308 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1309 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1310 1311 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1312 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1313 1314 /* 1315 * Optional fields 1316 */ 1317 mp->mnt_iosize_max = MAXPHYS; 1318 1319 /* 1320 * Connect up mount pointers. 1321 */ 1322 hammer2_mount_helper(mp, pmp); 1323 1324 lockmgr(&hammer2_mntlk, LK_RELEASE); 1325 1326 /* 1327 * Finish setup 1328 */ 1329 vfs_getnewfsid(mp); 1330 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1331 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1332 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1333 1334 if (path) { 1335 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1336 MNAMELEN - 1, &size); 1337 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1338 } /* else root mount, already in there */ 1339 1340 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1341 if (path) { 1342 copyinstr(path, mp->mnt_stat.f_mntonname, 1343 sizeof(mp->mnt_stat.f_mntonname) - 1, 1344 &size); 1345 } else { 1346 /* root mount */ 1347 mp->mnt_stat.f_mntonname[0] = '/'; 1348 } 1349 1350 /* 1351 * Initial statfs to prime mnt_stat. 1352 */ 1353 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1354 1355 return 0; 1356 } 1357 1358 /* 1359 * Scan PFSs under the super-root and create hammer2_pfs structures. 1360 */ 1361 static 1362 void 1363 hammer2_update_pmps(hammer2_dev_t *hmp) 1364 { 1365 const hammer2_inode_data_t *ripdata; 1366 hammer2_chain_t *parent; 1367 hammer2_chain_t *chain; 1368 hammer2_blockref_t bref; 1369 hammer2_dev_t *force_local; 1370 hammer2_pfs_t *spmp; 1371 hammer2_pfs_t *pmp; 1372 hammer2_key_t key_next; 1373 int cache_index = -1; 1374 1375 /* 1376 * Force local mount (disassociate all PFSs from their clusters). 1377 * Used primarily for debugging. 1378 */ 1379 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1380 1381 /* 1382 * Lookup mount point under the media-localized super-root. 1383 * 1384 * cluster->pmp will incorrectly point to spmp and must be fixed 1385 * up later on. 1386 */ 1387 spmp = hmp->spmp; 1388 hammer2_inode_lock(spmp->iroot, 0); 1389 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1390 chain = hammer2_chain_lookup(&parent, &key_next, 1391 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1392 &cache_index, 0); 1393 while (chain) { 1394 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1395 continue; 1396 ripdata = &chain->data->ipdata; 1397 bref = chain->bref; 1398 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename); 1399 1400 pmp = hammer2_pfsalloc(chain, ripdata, 1401 bref.modify_tid, force_local); 1402 chain = hammer2_chain_next(&parent, chain, &key_next, 1403 key_next, HAMMER2_KEY_MAX, 1404 &cache_index, 0); 1405 } 1406 if (parent) { 1407 hammer2_chain_unlock(parent); 1408 hammer2_chain_drop(parent); 1409 } 1410 hammer2_inode_unlock(spmp->iroot); 1411 } 1412 1413 static 1414 int 1415 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1416 struct vnode *devvp, struct ucred *cred) 1417 { 1418 int error; 1419 1420 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1421 error = hammer2_recovery(hmp); 1422 } else { 1423 error = 0; 1424 } 1425 return error; 1426 } 1427 1428 static 1429 int 1430 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1431 { 1432 hammer2_pfs_t *pmp; 1433 int flags; 1434 int error = 0; 1435 1436 pmp = MPTOPMP(mp); 1437 1438 if (pmp == NULL) 1439 return(0); 1440 1441 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1442 1443 /* 1444 * If mount initialization proceeded far enough we must flush 1445 * its vnodes and sync the underlying mount points. Three syncs 1446 * are required to fully flush the filesystem (freemap updates lag 1447 * by one flush, and one extra for safety). 1448 */ 1449 if (mntflags & MNT_FORCE) 1450 flags = FORCECLOSE; 1451 else 1452 flags = 0; 1453 if (pmp->iroot) { 1454 error = vflush(mp, 0, flags); 1455 if (error) 1456 goto failed; 1457 hammer2_vfs_sync(mp, MNT_WAIT); 1458 hammer2_vfs_sync(mp, MNT_WAIT); 1459 hammer2_vfs_sync(mp, MNT_WAIT); 1460 } 1461 1462 /* 1463 * Cleanup the frontend support XOPS threads 1464 */ 1465 hammer2_xop_helper_cleanup(pmp); 1466 1467 if (pmp->mp) 1468 hammer2_unmount_helper(mp, pmp, NULL); 1469 1470 error = 0; 1471 failed: 1472 lockmgr(&hammer2_mntlk, LK_RELEASE); 1473 1474 return (error); 1475 } 1476 1477 /* 1478 * Mount helper, hook the system mount into our PFS. 1479 * The mount lock is held. 1480 * 1481 * We must bump the mount_count on related devices for any 1482 * mounted PFSs. 1483 */ 1484 static 1485 void 1486 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1487 { 1488 hammer2_cluster_t *cluster; 1489 hammer2_chain_t *rchain; 1490 int i; 1491 1492 mp->mnt_data = (qaddr_t)pmp; 1493 pmp->mp = mp; 1494 1495 /* 1496 * After pmp->mp is set we have to adjust hmp->mount_count. 1497 */ 1498 cluster = &pmp->iroot->cluster; 1499 for (i = 0; i < cluster->nchains; ++i) { 1500 rchain = cluster->array[i].chain; 1501 if (rchain == NULL) 1502 continue; 1503 ++rchain->hmp->mount_count; 1504 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1505 rchain->hmp, rchain->hmp->mount_count); 1506 } 1507 1508 /* 1509 * Create missing Xop threads 1510 */ 1511 hammer2_xop_helper_create(pmp); 1512 } 1513 1514 /* 1515 * Mount helper, unhook the system mount from our PFS. 1516 * The mount lock is held. 1517 * 1518 * If hmp is supplied a mount responsible for being the first to open 1519 * the block device failed and the block device and all PFSs using the 1520 * block device must be cleaned up. 1521 * 1522 * If pmp is supplied multiple devices might be backing the PFS and each 1523 * must be disconnected. This might not be the last PFS using some of the 1524 * underlying devices. Also, we have to adjust our hmp->mount_count 1525 * accounting for the devices backing the pmp which is now undergoing an 1526 * unmount. 1527 */ 1528 static 1529 void 1530 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1531 { 1532 hammer2_cluster_t *cluster; 1533 hammer2_chain_t *rchain; 1534 struct vnode *devvp; 1535 int dumpcnt; 1536 int ronly = 0; 1537 int i; 1538 1539 /* 1540 * If no device supplied this is a high-level unmount and we have to 1541 * to disconnect the mount, adjust mount_count, and locate devices 1542 * that might now have no mounts. 1543 */ 1544 if (pmp) { 1545 KKASSERT(hmp == NULL); 1546 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1547 pmp->mp = NULL; 1548 mp->mnt_data = NULL; 1549 1550 /* 1551 * After pmp->mp is cleared we have to account for 1552 * mount_count. 1553 */ 1554 cluster = &pmp->iroot->cluster; 1555 for (i = 0; i < cluster->nchains; ++i) { 1556 rchain = cluster->array[i].chain; 1557 if (rchain == NULL) 1558 continue; 1559 --rchain->hmp->mount_count; 1560 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n", 1561 rchain->hmp, rchain->hmp->mount_count); 1562 /* scrapping hmp now may invalidate the pmp */ 1563 } 1564 again: 1565 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1566 if (hmp->mount_count == 0) { 1567 hammer2_unmount_helper(NULL, NULL, hmp); 1568 goto again; 1569 } 1570 } 1571 return; 1572 } 1573 1574 /* 1575 * Try to terminate the block device. We can't terminate it if 1576 * there are still PFSs referencing it. 1577 */ 1578 kprintf("hammer2_unmount hmp=%p mount_count=%d\n", 1579 hmp, hmp->mount_count); 1580 if (hmp->mount_count) 1581 return; 1582 1583 hammer2_pfsfree_scan(hmp); 1584 hammer2_dev_exlock(hmp); /* XXX order */ 1585 1586 /* 1587 * Cycle the volume data lock as a safety (probably not needed any 1588 * more). To ensure everything is out we need to flush at least 1589 * three times. (1) The running of the sideq can dirty the 1590 * filesystem, (2) A normal flush can dirty the freemap, and 1591 * (3) ensure that the freemap is fully synchronized. 1592 * 1593 * The next mount's recovery scan can clean everything up but we want 1594 * to leave the filesystem in a 100% clean state on a normal unmount. 1595 */ 1596 #if 0 1597 hammer2_voldata_lock(hmp); 1598 hammer2_voldata_unlock(hmp); 1599 #endif 1600 hammer2_iocom_uninit(hmp); 1601 1602 if ((hmp->vchain.flags | hmp->fchain.flags) & 1603 HAMMER2_CHAIN_FLUSH_MASK) { 1604 kprintf("hammer2_unmount: chains left over " 1605 "after final sync\n"); 1606 kprintf(" vchain %08x\n", hmp->vchain.flags); 1607 kprintf(" fchain %08x\n", hmp->fchain.flags); 1608 1609 if (hammer2_debug & 0x0010) 1610 Debugger("entered debugger"); 1611 } 1612 1613 KKASSERT(hmp->spmp == NULL); 1614 1615 /* 1616 * Finish up with the device vnode 1617 */ 1618 if ((devvp = hmp->devvp) != NULL) { 1619 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1620 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1621 hmp->devvp = NULL; 1622 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1623 vn_unlock(devvp); 1624 vrele(devvp); 1625 devvp = NULL; 1626 } 1627 1628 /* 1629 * Clear vchain/fchain flags that might prevent final cleanup 1630 * of these chains. 1631 */ 1632 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1633 atomic_add_long(&hammer2_count_modified_chains, -1); 1634 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1635 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1636 } 1637 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1638 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1639 } 1640 1641 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1642 atomic_add_long(&hammer2_count_modified_chains, -1); 1643 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1644 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1645 } 1646 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1647 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1648 } 1649 1650 /* 1651 * Final drop of embedded freemap root chain to 1652 * clean up fchain.core (fchain structure is not 1653 * flagged ALLOCATED so it is cleaned out and then 1654 * left to rot). 1655 */ 1656 hammer2_chain_drop(&hmp->fchain); 1657 1658 /* 1659 * Final drop of embedded volume root chain to clean 1660 * up vchain.core (vchain structure is not flagged 1661 * ALLOCATED so it is cleaned out and then left to 1662 * rot). 1663 */ 1664 dumpcnt = 50; 1665 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1666 dumpcnt = 50; 1667 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1668 hammer2_dev_unlock(hmp); 1669 hammer2_chain_drop(&hmp->vchain); 1670 1671 hammer2_io_cleanup(hmp, &hmp->iotree); 1672 if (hmp->iofree_count) { 1673 kprintf("io_cleanup: %d I/O's left hanging\n", 1674 hmp->iofree_count); 1675 } 1676 1677 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1678 kmalloc_destroy(&hmp->mchain); 1679 kfree(hmp, M_HAMMER2); 1680 } 1681 1682 int 1683 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1684 ino_t ino, struct vnode **vpp) 1685 { 1686 hammer2_xop_lookup_t *xop; 1687 hammer2_pfs_t *pmp; 1688 hammer2_inode_t *ip; 1689 hammer2_tid_t inum; 1690 int error; 1691 1692 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1693 1694 error = 0; 1695 pmp = MPTOPMP(mp); 1696 1697 /* 1698 * Easy if we already have it cached 1699 */ 1700 ip = hammer2_inode_lookup(pmp, inum); 1701 if (ip) { 1702 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1703 *vpp = hammer2_igetv(ip, &error); 1704 hammer2_inode_unlock(ip); 1705 hammer2_inode_drop(ip); /* from lookup */ 1706 1707 return error; 1708 } 1709 1710 /* 1711 * Otherwise we have to find the inode 1712 */ 1713 xop = hammer2_xop_alloc(pmp->iroot, 0); 1714 xop->lhc = inum; 1715 hammer2_xop_start(&xop->head, hammer2_xop_lookup); 1716 error = hammer2_xop_collect(&xop->head, 0); 1717 1718 if (error == 0) { 1719 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) { 1720 kprintf("vget: no collect error but also no rdata\n"); 1721 kprintf("xop %p\n", xop); 1722 while ((hammer2_debug & 0x80000) == 0) { 1723 tsleep(xop, PCATCH, "wait", hz * 10); 1724 } 1725 ip = NULL; 1726 } else { 1727 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1); 1728 } 1729 } 1730 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1731 1732 if (ip) { 1733 *vpp = hammer2_igetv(ip, &error); 1734 hammer2_inode_unlock(ip); 1735 } else { 1736 *vpp = NULL; 1737 error = ENOENT; 1738 } 1739 return (error); 1740 } 1741 1742 static 1743 int 1744 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1745 { 1746 hammer2_pfs_t *pmp; 1747 struct vnode *vp; 1748 int error; 1749 1750 pmp = MPTOPMP(mp); 1751 if (pmp->iroot == NULL) { 1752 *vpp = NULL; 1753 return EINVAL; 1754 } 1755 1756 error = 0; 1757 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1758 1759 while (pmp->inode_tid == 0) { 1760 hammer2_xop_ipcluster_t *xop; 1761 hammer2_inode_meta_t *meta; 1762 1763 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1764 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1765 error = hammer2_xop_collect(&xop->head, 0); 1766 1767 if (error == 0) { 1768 meta = &xop->head.cluster.focus->data->ipdata.meta; 1769 pmp->iroot->meta = *meta; 1770 pmp->inode_tid = meta->pfs_inum + 1; 1771 if (pmp->inode_tid < HAMMER2_INODE_START) 1772 pmp->inode_tid = HAMMER2_INODE_START; 1773 pmp->modify_tid = 1774 xop->head.cluster.focus->bref.modify_tid + 1; 1775 kprintf("PFS: Starting inode %jd\n", 1776 (intmax_t)pmp->inode_tid); 1777 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1778 pmp->inode_tid, pmp->modify_tid); 1779 wakeup(&pmp->iroot); 1780 1781 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1782 1783 /* 1784 * Prime the mount info. 1785 */ 1786 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1787 break; 1788 } 1789 1790 /* 1791 * Loop, try again 1792 */ 1793 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1794 hammer2_inode_unlock(pmp->iroot); 1795 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1796 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1797 if (error == EINTR) 1798 break; 1799 } 1800 1801 if (error) { 1802 hammer2_inode_unlock(pmp->iroot); 1803 *vpp = NULL; 1804 } else { 1805 vp = hammer2_igetv(pmp->iroot, &error); 1806 hammer2_inode_unlock(pmp->iroot); 1807 *vpp = vp; 1808 } 1809 1810 return (error); 1811 } 1812 1813 /* 1814 * Filesystem status 1815 * 1816 * XXX incorporate ipdata->meta.inode_quota and data_quota 1817 */ 1818 static 1819 int 1820 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1821 { 1822 hammer2_pfs_t *pmp; 1823 hammer2_dev_t *hmp; 1824 hammer2_blockref_t bref; 1825 int i; 1826 1827 /* 1828 * NOTE: iroot might not have validated the cluster yet. 1829 */ 1830 pmp = MPTOPMP(mp); 1831 1832 mp->mnt_stat.f_files = 0; 1833 mp->mnt_stat.f_ffree = 0; 1834 mp->mnt_stat.f_blocks = 0; 1835 mp->mnt_stat.f_bfree = 0; 1836 mp->mnt_stat.f_bavail = 0; 1837 1838 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1839 hmp = pmp->pfs_hmps[i]; 1840 if (hmp == NULL) 1841 continue; 1842 if (pmp->iroot->cluster.array[i].chain) 1843 bref = pmp->iroot->cluster.array[i].chain->bref; 1844 else 1845 bzero(&bref, sizeof(bref)); 1846 1847 mp->mnt_stat.f_files = bref.embed.stats.inode_count; 1848 mp->mnt_stat.f_ffree = 0; 1849 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / 1850 mp->mnt_vstat.f_bsize; 1851 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1852 mp->mnt_vstat.f_bsize; 1853 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1854 1855 *sbp = mp->mnt_stat; 1856 } 1857 return (0); 1858 } 1859 1860 static 1861 int 1862 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1863 { 1864 hammer2_pfs_t *pmp; 1865 hammer2_dev_t *hmp; 1866 hammer2_blockref_t bref; 1867 int i; 1868 1869 /* 1870 * NOTE: iroot might not have validated the cluster yet. 1871 */ 1872 pmp = MPTOPMP(mp); 1873 1874 mp->mnt_vstat.f_bsize = 0; 1875 mp->mnt_vstat.f_files = 0; 1876 mp->mnt_vstat.f_ffree = 0; 1877 mp->mnt_vstat.f_blocks = 0; 1878 mp->mnt_vstat.f_bfree = 0; 1879 mp->mnt_vstat.f_bavail = 0; 1880 1881 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1882 hmp = pmp->pfs_hmps[i]; 1883 if (hmp == NULL) 1884 continue; 1885 if (pmp->iroot->cluster.array[i].chain) 1886 bref = pmp->iroot->cluster.array[i].chain->bref; 1887 else 1888 bzero(&bref, sizeof(bref)); 1889 1890 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1891 mp->mnt_vstat.f_files = bref.embed.stats.inode_count; 1892 mp->mnt_vstat.f_ffree = 0; 1893 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / 1894 mp->mnt_vstat.f_bsize; 1895 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1896 mp->mnt_vstat.f_bsize; 1897 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1898 1899 *sbp = mp->mnt_vstat; 1900 } 1901 return (0); 1902 } 1903 1904 /* 1905 * Mount-time recovery (RW mounts) 1906 * 1907 * Updates to the free block table are allowed to lag flushes by one 1908 * transaction. In case of a crash, then on a fresh mount we must do an 1909 * incremental scan of the last committed transaction id and make sure that 1910 * all related blocks have been marked allocated. 1911 * 1912 * The super-root topology and each PFS has its own transaction id domain, 1913 * so we must track PFS boundary transitions. 1914 */ 1915 struct hammer2_recovery_elm { 1916 TAILQ_ENTRY(hammer2_recovery_elm) entry; 1917 hammer2_chain_t *chain; 1918 hammer2_tid_t sync_tid; 1919 }; 1920 1921 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 1922 1923 struct hammer2_recovery_info { 1924 struct hammer2_recovery_list list; 1925 hammer2_tid_t mtid; 1926 int depth; 1927 }; 1928 1929 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 1930 hammer2_chain_t *parent, 1931 struct hammer2_recovery_info *info, 1932 hammer2_tid_t sync_tid); 1933 1934 #define HAMMER2_RECOVERY_MAXDEPTH 10 1935 1936 static 1937 int 1938 hammer2_recovery(hammer2_dev_t *hmp) 1939 { 1940 struct hammer2_recovery_info info; 1941 struct hammer2_recovery_elm *elm; 1942 hammer2_chain_t *parent; 1943 hammer2_tid_t sync_tid; 1944 hammer2_tid_t mirror_tid; 1945 int error; 1946 int cumulative_error = 0; 1947 1948 hammer2_trans_init(hmp->spmp, 0); 1949 1950 sync_tid = hmp->voldata.freemap_tid; 1951 mirror_tid = hmp->voldata.mirror_tid; 1952 1953 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 1954 if (sync_tid >= mirror_tid) { 1955 kprintf(" no recovery needed\n"); 1956 } else { 1957 kprintf(" freemap recovery %016jx-%016jx\n", 1958 sync_tid + 1, mirror_tid); 1959 } 1960 1961 TAILQ_INIT(&info.list); 1962 info.depth = 0; 1963 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1964 cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 1965 hammer2_chain_lookup_done(parent); 1966 1967 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 1968 TAILQ_REMOVE(&info.list, elm, entry); 1969 parent = elm->chain; 1970 sync_tid = elm->sync_tid; 1971 kfree(elm, M_HAMMER2); 1972 1973 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1974 error = hammer2_recovery_scan(hmp, parent, &info, 1975 hmp->voldata.freemap_tid); 1976 hammer2_chain_unlock(parent); 1977 hammer2_chain_drop(parent); /* drop elm->chain ref */ 1978 if (error) 1979 cumulative_error = error; 1980 } 1981 hammer2_trans_done(hmp->spmp); 1982 1983 return cumulative_error; 1984 } 1985 1986 static 1987 int 1988 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 1989 struct hammer2_recovery_info *info, 1990 hammer2_tid_t sync_tid) 1991 { 1992 const hammer2_inode_data_t *ripdata; 1993 hammer2_chain_t *chain; 1994 hammer2_blockref_t bref; 1995 int cache_index; 1996 int cumulative_error = 0; 1997 int error; 1998 int first; 1999 2000 /* 2001 * Adjust freemap to ensure that the block(s) are marked allocated. 2002 */ 2003 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2004 hammer2_freemap_adjust(hmp, &parent->bref, 2005 HAMMER2_FREEMAP_DORECOVER); 2006 } 2007 2008 /* 2009 * Check type for recursive scan 2010 */ 2011 switch(parent->bref.type) { 2012 case HAMMER2_BREF_TYPE_VOLUME: 2013 /* data already instantiated */ 2014 break; 2015 case HAMMER2_BREF_TYPE_INODE: 2016 /* 2017 * Must instantiate data for DIRECTDATA test and also 2018 * for recursion. 2019 */ 2020 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2021 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2022 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2023 /* not applicable to recovery scan */ 2024 hammer2_chain_unlock(parent); 2025 return 0; 2026 } 2027 hammer2_chain_unlock(parent); 2028 break; 2029 case HAMMER2_BREF_TYPE_INDIRECT: 2030 /* 2031 * Must instantiate data for recursion 2032 */ 2033 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2034 hammer2_chain_unlock(parent); 2035 break; 2036 case HAMMER2_BREF_TYPE_DIRENT: 2037 case HAMMER2_BREF_TYPE_DATA: 2038 case HAMMER2_BREF_TYPE_FREEMAP: 2039 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2040 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2041 /* not applicable to recovery scan */ 2042 return 0; 2043 break; 2044 default: 2045 return EDOM; 2046 } 2047 2048 /* 2049 * Defer operation if depth limit reached or if we are crossing a 2050 * PFS boundary. 2051 */ 2052 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2053 struct hammer2_recovery_elm *elm; 2054 2055 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2056 elm->chain = parent; 2057 elm->sync_tid = sync_tid; 2058 hammer2_chain_ref(parent); 2059 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2060 /* unlocked by caller */ 2061 2062 return(0); 2063 } 2064 2065 2066 /* 2067 * Recursive scan of the last flushed transaction only. We are 2068 * doing this without pmp assignments so don't leave the chains 2069 * hanging around after we are done with them. 2070 */ 2071 cache_index = 0; 2072 chain = NULL; 2073 first = 1; 2074 2075 while (hammer2_chain_scan(parent, &chain, &bref, 2076 &first, &cache_index, 2077 HAMMER2_LOOKUP_NODATA) != NULL) { 2078 /* 2079 * If this is a leaf 2080 */ 2081 if (chain == NULL) { 2082 if (bref.mirror_tid > sync_tid) { 2083 hammer2_freemap_adjust(hmp, &bref, 2084 HAMMER2_FREEMAP_DORECOVER); 2085 } 2086 continue; 2087 } 2088 2089 /* 2090 * This may or may not be a recursive node. 2091 */ 2092 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2093 if (bref.mirror_tid > sync_tid) { 2094 ++info->depth; 2095 error = hammer2_recovery_scan(hmp, chain, 2096 info, sync_tid); 2097 --info->depth; 2098 if (error) 2099 cumulative_error = error; 2100 } 2101 2102 /* 2103 * Flush the recovery at the PFS boundary to stage it for 2104 * the final flush of the super-root topology. 2105 */ 2106 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2107 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2108 hammer2_flush(chain, HAMMER2_FLUSH_TOP); 2109 } 2110 } 2111 2112 return cumulative_error; 2113 } 2114 2115 /* 2116 * Sync a mount point; this is called on a per-mount basis from the 2117 * filesystem syncer process periodically and whenever a user issues 2118 * a sync. 2119 */ 2120 int 2121 hammer2_vfs_sync(struct mount *mp, int waitfor) 2122 { 2123 hammer2_xop_flush_t *xop; 2124 struct hammer2_sync_info info; 2125 hammer2_inode_t *iroot; 2126 hammer2_pfs_t *pmp; 2127 int flags; 2128 int error; 2129 2130 pmp = MPTOPMP(mp); 2131 iroot = pmp->iroot; 2132 KKASSERT(iroot); 2133 KKASSERT(iroot->pmp == pmp); 2134 2135 /* 2136 * We can't acquire locks on existing vnodes while in a transaction 2137 * without risking a deadlock. This assumes that vfsync() can be 2138 * called without the vnode locked (which it can in DragonFly). 2139 * Otherwise we'd have to implement a multi-pass or flag the lock 2140 * failures and retry. 2141 * 2142 * The reclamation code interlocks with the sync list's token 2143 * (by removing the vnode from the scan list) before unlocking 2144 * the inode, giving us time to ref the inode. 2145 */ 2146 /*flags = VMSC_GETVP;*/ 2147 flags = 0; 2148 if (waitfor & MNT_LAZY) 2149 flags |= VMSC_ONEPASS; 2150 2151 /* 2152 * Preflush the vnodes using a normal transaction before interlocking 2153 * with a flush transaction. We do this to try to run as much of 2154 * the compression as possible outside the flush transaction. 2155 * 2156 * For efficiency do an async pass before making sure with a 2157 * synchronous pass on all related buffer cache buffers. 2158 */ 2159 hammer2_trans_init(pmp, 0); 2160 info.error = 0; 2161 info.waitfor = MNT_NOWAIT; 2162 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2163 info.waitfor = MNT_WAIT; 2164 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2165 hammer2_trans_done(pmp); 2166 2167 /* 2168 * Start our flush transaction. This does not return until all 2169 * concurrent transactions have completed and will prevent any 2170 * new transactions from running concurrently, except for the 2171 * buffer cache transactions. 2172 * 2173 * NOTE! It is still possible for the paging code to push pages 2174 * out via a UIO_NOCOPY hammer2_vop_write() during the main 2175 * flush. 2176 */ 2177 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2178 hammer2_inode_run_sideq(pmp); 2179 2180 info.error = 0; 2181 info.waitfor = MNT_NOWAIT; 2182 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2183 info.waitfor = MNT_WAIT; 2184 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2185 hammer2_bioq_sync(pmp); 2186 2187 /* 2188 * Use the XOP interface to concurrently flush all nodes to 2189 * synchronize the PFSROOT subtopology to the media. A standard 2190 * end-of-scan ENOENT error indicates cluster sufficiency. 2191 * 2192 * Note that this flush will not be visible on crash recovery until 2193 * we flush the super-root topology in the next loop. 2194 * 2195 * XXX For now wait for all flushes to complete. 2196 */ 2197 if (iroot) { 2198 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 2199 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 2200 error = hammer2_xop_collect(&xop->head, 2201 HAMMER2_XOP_COLLECT_WAITALL); 2202 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2203 if (error == ENOENT) 2204 error = 0; 2205 } else { 2206 error = 0; 2207 } 2208 hammer2_trans_done(pmp); 2209 2210 return (error); 2211 } 2212 2213 /* 2214 * Sync passes. 2215 * 2216 * Note that we ignore the tranasction mtid we got above. Instead, 2217 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 2218 * transactions. 2219 */ 2220 static int 2221 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 2222 { 2223 struct hammer2_sync_info *info = data; 2224 hammer2_inode_t *ip; 2225 int error; 2226 2227 /* 2228 * Degenerate cases. Note that ip == NULL typically means the 2229 * syncer vnode itself and we don't want to vclrisdirty() in that 2230 * situation. 2231 */ 2232 ip = VTOI(vp); 2233 if (ip == NULL) { 2234 return(0); 2235 } 2236 if (vp->v_type == VNON || vp->v_type == VBAD) { 2237 vclrisdirty(vp); 2238 return(0); 2239 } 2240 2241 /* 2242 * VOP_FSYNC will start a new transaction so replicate some code 2243 * here to do it inline (see hammer2_vop_fsync()). 2244 * 2245 * WARNING: The vfsync interacts with the buffer cache and might 2246 * block, we can't hold the inode lock at that time. 2247 * However, we MUST ref ip before blocking to ensure that 2248 * it isn't ripped out from under us (since we do not 2249 * hold a lock on the vnode). 2250 */ 2251 hammer2_inode_ref(ip); 2252 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2253 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2254 vfsync(vp, info->waitfor, 1, NULL, NULL); 2255 if (ip->flags & (HAMMER2_INODE_RESIZED | 2256 HAMMER2_INODE_MODIFIED)) { 2257 hammer2_inode_lock(ip, 0); 2258 hammer2_inode_chain_sync(ip); 2259 hammer2_inode_unlock(ip); 2260 } 2261 } 2262 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2263 RB_EMPTY(&vp->v_rbdirty_tree)) { 2264 vclrisdirty(vp); 2265 } 2266 2267 hammer2_inode_drop(ip); 2268 #if 1 2269 error = 0; 2270 if (error) 2271 info->error = error; 2272 #endif 2273 return(0); 2274 } 2275 2276 static 2277 int 2278 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2279 { 2280 hammer2_inode_t *ip; 2281 2282 KKASSERT(MAXFIDSZ >= 16); 2283 ip = VTOI(vp); 2284 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2285 fhp->fid_ext = 0; 2286 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2287 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2288 2289 return 0; 2290 } 2291 2292 static 2293 int 2294 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2295 struct fid *fhp, struct vnode **vpp) 2296 { 2297 hammer2_pfs_t *pmp; 2298 hammer2_tid_t inum; 2299 int error; 2300 2301 pmp = MPTOPMP(mp); 2302 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2303 if (vpp) { 2304 if (inum == 1) 2305 error = hammer2_vfs_root(mp, vpp); 2306 else 2307 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2308 } else { 2309 error = 0; 2310 } 2311 if (error) 2312 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2313 return error; 2314 } 2315 2316 static 2317 int 2318 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2319 int *exflagsp, struct ucred **credanonp) 2320 { 2321 hammer2_pfs_t *pmp; 2322 struct netcred *np; 2323 int error; 2324 2325 pmp = MPTOPMP(mp); 2326 np = vfs_export_lookup(mp, &pmp->export, nam); 2327 if (np) { 2328 *exflagsp = np->netc_exflags; 2329 *credanonp = &np->netc_anon; 2330 error = 0; 2331 } else { 2332 error = EACCES; 2333 } 2334 return error; 2335 } 2336 2337 /* 2338 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2339 * header into the HMP 2340 * 2341 * XXX read four volhdrs and use the one with the highest TID whos CRC 2342 * matches. 2343 * 2344 * XXX check iCRCs. 2345 * 2346 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2347 * nonexistant locations. 2348 * 2349 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2350 */ 2351 static 2352 int 2353 hammer2_install_volume_header(hammer2_dev_t *hmp) 2354 { 2355 hammer2_volume_data_t *vd; 2356 struct buf *bp; 2357 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2358 int error_reported; 2359 int error; 2360 int valid; 2361 int i; 2362 2363 error_reported = 0; 2364 error = 0; 2365 valid = 0; 2366 bp = NULL; 2367 2368 /* 2369 * There are up to 4 copies of the volume header (syncs iterate 2370 * between them so there is no single master). We don't trust the 2371 * volu_size field so we don't know precisely how large the filesystem 2372 * is, so depend on the OS to return an error if we go beyond the 2373 * block device's EOF. 2374 */ 2375 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2376 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2377 HAMMER2_VOLUME_BYTES, &bp); 2378 if (error) { 2379 brelse(bp); 2380 bp = NULL; 2381 continue; 2382 } 2383 2384 vd = (struct hammer2_volume_data *) bp->b_data; 2385 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2386 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2387 brelse(bp); 2388 bp = NULL; 2389 continue; 2390 } 2391 2392 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2393 /* XXX: Reversed-endianness filesystem */ 2394 kprintf("hammer2: reverse-endian filesystem detected"); 2395 brelse(bp); 2396 bp = NULL; 2397 continue; 2398 } 2399 2400 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2401 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2402 HAMMER2_VOLUME_ICRC0_SIZE); 2403 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2404 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2405 HAMMER2_VOLUME_ICRC1_SIZE); 2406 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2407 kprintf("hammer2 volume header crc " 2408 "mismatch copy #%d %08x/%08x\n", 2409 i, crc0, crc); 2410 error_reported = 1; 2411 brelse(bp); 2412 bp = NULL; 2413 continue; 2414 } 2415 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2416 valid = 1; 2417 hmp->voldata = *vd; 2418 hmp->volhdrno = i; 2419 } 2420 brelse(bp); 2421 bp = NULL; 2422 } 2423 if (valid) { 2424 hmp->volsync = hmp->voldata; 2425 error = 0; 2426 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2427 kprintf("hammer2: using volume header #%d\n", 2428 hmp->volhdrno); 2429 } 2430 } else { 2431 error = EINVAL; 2432 kprintf("hammer2: no valid volume headers found!\n"); 2433 } 2434 return (error); 2435 } 2436 2437 /* 2438 * This handles hysteresis on regular file flushes. Because the BIOs are 2439 * routed to a thread it is possible for an excessive number to build up 2440 * and cause long front-end stalls long before the runningbuffspace limit 2441 * is hit, so we implement hammer2_flush_pipe to control the 2442 * hysteresis. 2443 * 2444 * This is a particular problem when compression is used. 2445 */ 2446 void 2447 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2448 { 2449 atomic_add_int(&pmp->count_lwinprog, 1); 2450 } 2451 2452 void 2453 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2454 { 2455 int lwinprog; 2456 2457 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2458 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2459 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2460 atomic_clear_int(&pmp->count_lwinprog, 2461 HAMMER2_LWINPROG_WAITING); 2462 wakeup(&pmp->count_lwinprog); 2463 } 2464 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2465 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2466 atomic_clear_int(&pmp->count_lwinprog, 2467 HAMMER2_LWINPROG_WAITING0); 2468 wakeup(&pmp->count_lwinprog); 2469 } 2470 } 2471 2472 void 2473 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2474 { 2475 int lwinprog; 2476 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2477 HAMMER2_LWINPROG_WAITING0; 2478 2479 for (;;) { 2480 lwinprog = pmp->count_lwinprog; 2481 cpu_ccfence(); 2482 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2483 break; 2484 tsleep_interlock(&pmp->count_lwinprog, 0); 2485 atomic_set_int(&pmp->count_lwinprog, lwflag); 2486 lwinprog = pmp->count_lwinprog; 2487 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2488 break; 2489 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2490 } 2491 } 2492 2493 /* 2494 * Manage excessive memory resource use for chain and related 2495 * structures. 2496 */ 2497 void 2498 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2499 { 2500 uint32_t waiting; 2501 uint32_t count; 2502 uint32_t limit; 2503 #if 0 2504 static int zzticks; 2505 #endif 2506 2507 /* 2508 * Atomic check condition and wait. Also do an early speedup of 2509 * the syncer to try to avoid hitting the wait. 2510 */ 2511 for (;;) { 2512 waiting = pmp->inmem_dirty_chains; 2513 cpu_ccfence(); 2514 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2515 2516 limit = pmp->mp->mnt_nvnodelistsize / 10; 2517 if (limit < hammer2_limit_dirty_chains) 2518 limit = hammer2_limit_dirty_chains; 2519 if (limit < 1000) 2520 limit = 1000; 2521 2522 #if 0 2523 if ((int)(ticks - zzticks) > hz) { 2524 zzticks = ticks; 2525 kprintf("count %ld %ld\n", count, limit); 2526 } 2527 #endif 2528 2529 /* 2530 * Block if there are too many dirty chains present, wait 2531 * for the flush to clean some out. 2532 */ 2533 if (count > limit) { 2534 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2535 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2536 waiting, 2537 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2538 speedup_syncer(pmp->mp); 2539 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2540 "chnmem", hz); 2541 } 2542 continue; /* loop on success or fail */ 2543 } 2544 2545 /* 2546 * Try to start an early flush before we are forced to block. 2547 */ 2548 if (count > limit * 7 / 10) 2549 speedup_syncer(pmp->mp); 2550 break; 2551 } 2552 } 2553 2554 void 2555 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2556 { 2557 if (pmp) { 2558 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2559 } 2560 } 2561 2562 void 2563 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2564 { 2565 uint32_t waiting; 2566 2567 if (pmp == NULL) 2568 return; 2569 2570 for (;;) { 2571 waiting = pmp->inmem_dirty_chains; 2572 cpu_ccfence(); 2573 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2574 waiting, 2575 (waiting - 1) & 2576 ~HAMMER2_DIRTYCHAIN_WAITING)) { 2577 break; 2578 } 2579 } 2580 2581 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) 2582 wakeup(&pmp->inmem_dirty_chains); 2583 } 2584 2585 /* 2586 * Debugging 2587 */ 2588 void 2589 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2590 { 2591 hammer2_chain_t *scan; 2592 hammer2_chain_t *parent; 2593 2594 --*countp; 2595 if (*countp == 0) { 2596 kprintf("%*.*s...\n", tab, tab, ""); 2597 return; 2598 } 2599 if (*countp < 0) 2600 return; 2601 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2602 tab, tab, "", pfx, 2603 chain, chain->bref.type, 2604 chain->bref.key, chain->bref.keybits, 2605 chain->bref.mirror_tid); 2606 2607 kprintf("%*.*s [%08x] (%s) refs=%d", 2608 tab, tab, "", 2609 chain->flags, 2610 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2611 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2612 chain->refs); 2613 2614 parent = chain->parent; 2615 if (parent) 2616 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2617 tab, tab, "", 2618 parent, parent->flags, parent->refs); 2619 if (RB_EMPTY(&chain->core.rbtree)) { 2620 kprintf("\n"); 2621 } else { 2622 kprintf(" {\n"); 2623 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2624 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2625 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2626 kprintf("%*.*s}(%s)\n", tab, tab, "", 2627 chain->data->ipdata.filename); 2628 else 2629 kprintf("%*.*s}\n", tab, tab, ""); 2630 } 2631 } 2632