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 pmp->iroot = iroot; 403 hammer2_inode_ref(iroot); 404 hammer2_inode_unlock(iroot); 405 } 406 407 /* 408 * Stop here if no chain is passed in. 409 */ 410 if (chain == NULL) 411 goto done; 412 413 /* 414 * When a chain is passed in we must add it to the PFS's root 415 * inode, update pmp->pfs_types[], and update the syncronization 416 * threads. 417 * 418 * When forcing local mode, mark the PFS as a MASTER regardless. 419 * 420 * At the moment empty spots can develop due to removals or failures. 421 * Ultimately we want to re-fill these spots but doing so might 422 * confused running code. XXX 423 */ 424 hammer2_inode_ref(iroot); 425 hammer2_mtx_ex(&iroot->lock); 426 j = iroot->cluster.nchains; 427 428 kprintf("add PFS to pmp %p[%d]\n", pmp, j); 429 430 if (j == HAMMER2_MAXCLUSTER) { 431 kprintf("hammer2_mount: cluster full!\n"); 432 /* XXX fatal error? */ 433 } else { 434 KKASSERT(chain->pmp == NULL); 435 chain->pmp = pmp; 436 hammer2_chain_ref(chain); 437 iroot->cluster.array[j].chain = chain; 438 if (force_local) 439 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 440 else 441 pmp->pfs_types[j] = ripdata->meta.pfs_type; 442 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 443 pmp->pfs_hmps[j] = chain->hmp; 444 445 /* 446 * If the PFS is already mounted we must account 447 * for the mount_count here. 448 */ 449 if (pmp->mp) 450 ++chain->hmp->mount_count; 451 452 /* 453 * May have to fixup dirty chain tracking. Previous 454 * pmp was NULL so nothing to undo. 455 */ 456 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 457 hammer2_pfs_memory_inc(pmp); 458 ++j; 459 } 460 iroot->cluster.nchains = j; 461 462 /* 463 * Update nmasters from any PFS inode which is part of the cluster. 464 * It is possible that this will result in a value which is too 465 * high. MASTER PFSs are authoritative for pfs_nmasters and will 466 * override this value later on. 467 * 468 * (This informs us of masters that might not currently be 469 * discoverable by this mount). 470 */ 471 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 472 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 473 } 474 475 /* 476 * Count visible masters. Masters are usually added with 477 * ripdata->meta.pfs_nmasters set to 1. This detects when there 478 * are more (XXX and must update the master inodes). 479 */ 480 count = 0; 481 for (i = 0; i < iroot->cluster.nchains; ++i) { 482 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 483 ++count; 484 } 485 if (pmp->pfs_nmasters < count) 486 pmp->pfs_nmasters = count; 487 488 /* 489 * Create missing synchronization and support threads. 490 * 491 * Single-node masters (including snapshots) have nothing to 492 * synchronize and do not require this thread. 493 * 494 * Multi-node masters or any number of soft masters, slaves, copy, 495 * or other PFS types need the thread. 496 * 497 * Each thread is responsible for its particular cluster index. 498 * We use independent threads so stalls or mismatches related to 499 * any given target do not affect other targets. 500 */ 501 for (i = 0; i < iroot->cluster.nchains; ++i) { 502 /* 503 * Single-node masters (including snapshots) have nothing 504 * to synchronize and will make direct xops support calls, 505 * thus they do not require this thread. 506 * 507 * Note that there can be thousands of snapshots. We do not 508 * want to create thousands of threads. 509 */ 510 if (pmp->pfs_nmasters <= 1 && 511 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 512 continue; 513 } 514 515 /* 516 * Sync support thread 517 */ 518 if (pmp->sync_thrs[i].td == NULL) { 519 hammer2_thr_create(&pmp->sync_thrs[i], pmp, 520 "h2nod", i, -1, 521 hammer2_primary_sync_thread); 522 } 523 } 524 525 /* 526 * Create missing Xop threads 527 * 528 * NOTE: We create helper threads for all mounted PFSs or any 529 * PFSs with 2+ nodes (so the sync thread can update them, 530 * even if not mounted). 531 */ 532 if (pmp->mp || iroot->cluster.nchains >= 2) 533 hammer2_xop_helper_create(pmp); 534 535 hammer2_mtx_unlock(&iroot->lock); 536 hammer2_inode_drop(iroot); 537 done: 538 return pmp; 539 } 540 541 /* 542 * Deallocate an element of a probed PFS. If destroying and this is a 543 * MASTER, adjust nmasters. 544 * 545 * This function does not physically destroy the PFS element in its device 546 * under the super-root (see hammer2_ioctl_pfs_delete()). 547 */ 548 void 549 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 550 { 551 hammer2_inode_t *iroot; 552 hammer2_chain_t *chain; 553 int j; 554 555 /* 556 * Cleanup our reference on iroot. iroot is (should) not be needed 557 * by the flush code. 558 */ 559 iroot = pmp->iroot; 560 if (iroot) { 561 /* 562 * Stop synchronizing 563 * 564 * XXX flush after acquiring the iroot lock. 565 * XXX clean out the cluster index from all inode structures. 566 */ 567 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 568 569 /* 570 * Remove the cluster index from the group. If destroying 571 * the PFS and this is a master, adjust pfs_nmasters. 572 */ 573 hammer2_mtx_ex(&iroot->lock); 574 chain = iroot->cluster.array[clindex].chain; 575 iroot->cluster.array[clindex].chain = NULL; 576 577 switch(pmp->pfs_types[clindex]) { 578 case HAMMER2_PFSTYPE_MASTER: 579 if (destroying && pmp->pfs_nmasters > 0) 580 --pmp->pfs_nmasters; 581 /* XXX adjust ripdata->meta.pfs_nmasters */ 582 break; 583 default: 584 break; 585 } 586 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 587 588 hammer2_mtx_unlock(&iroot->lock); 589 590 /* 591 * Release the chain. 592 */ 593 if (chain) { 594 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 595 hammer2_chain_drop(chain); 596 } 597 598 /* 599 * Terminate all XOP threads for the cluster index. 600 */ 601 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 602 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]); 603 } 604 } 605 606 /* 607 * Destroy a PFS, typically only occurs after the last mount on a device 608 * has gone away. 609 */ 610 static void 611 hammer2_pfsfree(hammer2_pfs_t *pmp) 612 { 613 hammer2_inode_t *iroot; 614 hammer2_chain_t *chain; 615 int i; 616 int j; 617 618 /* 619 * Cleanup our reference on iroot. iroot is (should) not be needed 620 * by the flush code. 621 */ 622 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 623 624 iroot = pmp->iroot; 625 if (iroot) { 626 for (i = 0; i < iroot->cluster.nchains; ++i) { 627 hammer2_thr_delete(&pmp->sync_thrs[i]); 628 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 629 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 630 } 631 #if REPORT_REFS_ERRORS 632 if (pmp->iroot->refs != 1) 633 kprintf("PMP->IROOT %p REFS WRONG %d\n", 634 pmp->iroot, pmp->iroot->refs); 635 #else 636 KKASSERT(pmp->iroot->refs == 1); 637 #endif 638 /* ref for pmp->iroot */ 639 hammer2_inode_drop(pmp->iroot); 640 pmp->iroot = NULL; 641 } 642 643 /* 644 * Cleanup chains remaining on LRU list. 645 */ 646 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count); 647 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 648 hammer2_chain_ref(chain); 649 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 650 hammer2_chain_drop(chain); 651 } 652 653 /* 654 * Free remaining pmp resources 655 */ 656 kmalloc_destroy(&pmp->mmsg); 657 kmalloc_destroy(&pmp->minode); 658 659 kfree(pmp, M_HAMMER2); 660 } 661 662 /* 663 * Remove all references to hmp from the pfs list. Any PFS which becomes 664 * empty is terminated and freed. 665 * 666 * XXX inefficient. 667 */ 668 static void 669 hammer2_pfsfree_scan(hammer2_dev_t *hmp) 670 { 671 hammer2_pfs_t *pmp; 672 hammer2_inode_t *iroot; 673 hammer2_chain_t *rchain; 674 int didfreeze; 675 int i; 676 int j; 677 678 again: 679 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 680 if ((iroot = pmp->iroot) == NULL) 681 continue; 682 if (hmp->spmp == pmp) { 683 kprintf("unmount hmp %p remove spmp %p\n", 684 hmp, pmp); 685 hmp->spmp = NULL; 686 } 687 688 /* 689 * Determine if this PFS is affected. If it is we must 690 * freeze all management threads and lock its iroot. 691 * 692 * Freezing a management thread forces it idle, operations 693 * in-progress will be aborted and it will have to start 694 * over again when unfrozen, or exit if told to exit. 695 */ 696 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 697 if (pmp->pfs_hmps[i] == hmp) 698 break; 699 } 700 if (i != HAMMER2_MAXCLUSTER) { 701 /* 702 * Make sure all synchronization threads are locked 703 * down. 704 */ 705 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 706 if (pmp->pfs_hmps[i] == NULL) 707 continue; 708 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 709 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 710 hammer2_thr_freeze_async( 711 &pmp->xop_groups[j].thrs[i]); 712 } 713 } 714 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 715 if (pmp->pfs_hmps[i] == NULL) 716 continue; 717 hammer2_thr_freeze(&pmp->sync_thrs[i]); 718 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 719 hammer2_thr_freeze( 720 &pmp->xop_groups[j].thrs[i]); 721 } 722 } 723 724 /* 725 * Lock the inode and clean out matching chains. 726 * Note that we cannot use hammer2_inode_lock_*() 727 * here because that would attempt to validate the 728 * cluster that we are in the middle of ripping 729 * apart. 730 * 731 * WARNING! We are working directly on the inodes 732 * embedded cluster. 733 */ 734 hammer2_mtx_ex(&iroot->lock); 735 736 /* 737 * Remove the chain from matching elements of the PFS. 738 */ 739 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 740 if (pmp->pfs_hmps[i] != hmp) 741 continue; 742 hammer2_thr_delete(&pmp->sync_thrs[i]); 743 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 744 hammer2_thr_delete( 745 &pmp->xop_groups[j].thrs[i]); 746 } 747 rchain = iroot->cluster.array[i].chain; 748 iroot->cluster.array[i].chain = NULL; 749 pmp->pfs_types[i] = 0; 750 if (pmp->pfs_names[i]) { 751 kfree(pmp->pfs_names[i], M_HAMMER2); 752 pmp->pfs_names[i] = NULL; 753 } 754 if (rchain) { 755 hammer2_chain_drop(rchain); 756 /* focus hint */ 757 if (iroot->cluster.focus == rchain) 758 iroot->cluster.focus = NULL; 759 } 760 pmp->pfs_hmps[i] = NULL; 761 } 762 hammer2_mtx_unlock(&iroot->lock); 763 didfreeze = 1; /* remaster, unfreeze down below */ 764 } else { 765 didfreeze = 0; 766 } 767 768 /* 769 * Cleanup trailing chains. Gaps may remain. 770 */ 771 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 772 if (pmp->pfs_hmps[i]) 773 break; 774 } 775 iroot->cluster.nchains = i + 1; 776 777 /* 778 * If the PMP has no elements remaining we can destroy it. 779 * (this will transition management threads from frozen->exit). 780 */ 781 if (iroot->cluster.nchains == 0) { 782 kprintf("unmount hmp %p last ref to PMP=%p\n", 783 hmp, pmp); 784 hammer2_pfsfree(pmp); 785 goto again; 786 } 787 788 /* 789 * If elements still remain we need to set the REMASTER 790 * flag and unfreeze it. 791 */ 792 if (didfreeze) { 793 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 794 if (pmp->pfs_hmps[i] == NULL) 795 continue; 796 hammer2_thr_remaster(&pmp->sync_thrs[i]); 797 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 798 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 799 hammer2_thr_remaster( 800 &pmp->xop_groups[j].thrs[i]); 801 hammer2_thr_unfreeze( 802 &pmp->xop_groups[j].thrs[i]); 803 } 804 } 805 } 806 } 807 } 808 809 /* 810 * Mount or remount HAMMER2 fileystem from physical media 811 * 812 * mountroot 813 * mp mount point structure 814 * path NULL 815 * data <unused> 816 * cred <unused> 817 * 818 * mount 819 * mp mount point structure 820 * path path to mount point 821 * data pointer to argument structure in user space 822 * volume volume path (device@LABEL form) 823 * hflags user mount flags 824 * cred user credentials 825 * 826 * RETURNS: 0 Success 827 * !0 error number 828 */ 829 static 830 int 831 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 832 struct ucred *cred) 833 { 834 struct hammer2_mount_info info; 835 hammer2_pfs_t *pmp; 836 hammer2_pfs_t *spmp; 837 hammer2_dev_t *hmp; 838 hammer2_dev_t *force_local; 839 hammer2_key_t key_next; 840 hammer2_key_t key_dummy; 841 hammer2_key_t lhc; 842 struct vnode *devvp; 843 struct nlookupdata nd; 844 hammer2_chain_t *parent; 845 hammer2_chain_t *chain; 846 hammer2_cluster_t *cluster; 847 const hammer2_inode_data_t *ripdata; 848 hammer2_blockref_t bref; 849 struct file *fp; 850 char devstr[MNAMELEN]; 851 size_t size; 852 size_t done; 853 char *dev; 854 char *label; 855 int ronly = 1; 856 int error; 857 int cache_index; 858 int i; 859 860 hmp = NULL; 861 pmp = NULL; 862 dev = NULL; 863 label = NULL; 864 devvp = NULL; 865 cache_index = -1; 866 867 kprintf("hammer2_mount\n"); 868 869 if (path == NULL) { 870 /* 871 * Root mount 872 */ 873 bzero(&info, sizeof(info)); 874 info.cluster_fd = -1; 875 ksnprintf(devstr, sizeof(devstr), "%s", 876 mp->mnt_stat.f_mntfromname); 877 kprintf("hammer2_mount: root '%s'\n", devstr); 878 } else { 879 /* 880 * Non-root mount or updating a mount 881 */ 882 error = copyin(data, &info, sizeof(info)); 883 if (error) 884 return (error); 885 886 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 887 if (error) 888 return (error); 889 } 890 891 /* Extract device and label */ 892 dev = devstr; 893 label = strchr(devstr, '@'); 894 if (label == NULL || 895 ((label + 1) - dev) > done) { 896 return (EINVAL); 897 } 898 *label = '\0'; 899 label++; 900 if (*label == '\0') 901 return (EINVAL); 902 903 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\"\n", 904 dev, label); 905 906 if (mp->mnt_flag & MNT_UPDATE) { 907 /* 908 * Update mount. Note that pmp->iroot->cluster is 909 * an inode-embedded cluster and thus cannot be 910 * directly locked. 911 * 912 * XXX HAMMER2 needs to implement NFS export via 913 * mountctl. 914 */ 915 pmp = MPTOPMP(mp); 916 pmp->hflags = info.hflags; 917 cluster = &pmp->iroot->cluster; 918 for (i = 0; i < cluster->nchains; ++i) { 919 if (cluster->array[i].chain == NULL) 920 continue; 921 hmp = cluster->array[i].chain->hmp; 922 devvp = hmp->devvp; 923 error = hammer2_remount(hmp, mp, path, 924 devvp, cred); 925 if (error) 926 break; 927 } 928 929 return error; 930 } 931 932 /* 933 * HMP device mount 934 * 935 * If a path is specified and dev is not an empty string, lookup the 936 * name and verify that it referes to a block device. 937 * 938 * If a path is specified and dev is an empty string we fall through 939 * and locate the label in the hmp search. 940 */ 941 if (path && *dev != 0) { 942 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 943 if (error == 0) 944 error = nlookup(&nd); 945 if (error == 0) 946 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 947 nlookup_done(&nd); 948 } else if (path == NULL) { 949 /* root mount */ 950 cdev_t cdev = kgetdiskbyname(dev); 951 error = bdevvp(cdev, &devvp); 952 if (error) 953 kprintf("hammer2: cannot find '%s'\n", dev); 954 } else { 955 /* 956 * We will locate the hmp using the label in the hmp loop. 957 */ 958 error = 0; 959 } 960 961 if (error == 0 && devvp) { 962 if (vn_isdisk(devvp, &error)) 963 error = vfs_mountedon(devvp); 964 } 965 966 /* 967 * Determine if the device has already been mounted. After this 968 * check hmp will be non-NULL if we are doing the second or more 969 * hammer2 mounts from the same device. 970 */ 971 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 972 if (devvp) { 973 /* 974 * Match the device 975 */ 976 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 977 if (hmp->devvp == devvp) 978 break; 979 } 980 } else if (error == 0) { 981 /* 982 * Match the label to a pmp already probed. 983 */ 984 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 985 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 986 if (pmp->pfs_names[i] && 987 strcmp(pmp->pfs_names[i], label) == 0) { 988 hmp = pmp->pfs_hmps[i]; 989 break; 990 } 991 } 992 if (hmp) 993 break; 994 } 995 if (hmp == NULL) 996 error = ENOENT; 997 } 998 999 /* 1000 * Open the device if this isn't a secondary mount and construct 1001 * the H2 device mount (hmp). 1002 */ 1003 if (hmp == NULL) { 1004 hammer2_chain_t *schain; 1005 hammer2_xid_t xid; 1006 1007 if (error == 0 && vcount(devvp) > 0) 1008 error = EBUSY; 1009 1010 /* 1011 * Now open the device 1012 */ 1013 if (error == 0) { 1014 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1015 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1016 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1017 if (error == 0) { 1018 error = VOP_OPEN(devvp, 1019 ronly ? FREAD : FREAD | FWRITE, 1020 FSCRED, NULL); 1021 } 1022 vn_unlock(devvp); 1023 } 1024 if (error && devvp) { 1025 vrele(devvp); 1026 devvp = NULL; 1027 } 1028 if (error) { 1029 lockmgr(&hammer2_mntlk, LK_RELEASE); 1030 return error; 1031 } 1032 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1033 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1034 hmp->ronly = ronly; 1035 hmp->devvp = devvp; 1036 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1037 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1038 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1039 RB_INIT(&hmp->iotree); 1040 spin_init(&hmp->io_spin, "hm2mount_io"); 1041 spin_init(&hmp->list_spin, "hm2mount_list"); 1042 TAILQ_INIT(&hmp->flushq); 1043 1044 lockinit(&hmp->vollk, "h2vol", 0, 0); 1045 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1046 1047 /* 1048 * vchain setup. vchain.data is embedded. 1049 * vchain.refs is initialized and will never drop to 0. 1050 * 1051 * NOTE! voldata is not yet loaded. 1052 */ 1053 hmp->vchain.hmp = hmp; 1054 hmp->vchain.refs = 1; 1055 hmp->vchain.data = (void *)&hmp->voldata; 1056 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1057 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1058 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1059 1060 hammer2_chain_core_init(&hmp->vchain); 1061 /* hmp->vchain.u.xxx is left NULL */ 1062 1063 /* 1064 * fchain setup. fchain.data is embedded. 1065 * fchain.refs is initialized and will never drop to 0. 1066 * 1067 * The data is not used but needs to be initialized to 1068 * pass assertion muster. We use this chain primarily 1069 * as a placeholder for the freemap's top-level RBTREE 1070 * so it does not interfere with the volume's topology 1071 * RBTREE. 1072 */ 1073 hmp->fchain.hmp = hmp; 1074 hmp->fchain.refs = 1; 1075 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1076 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1077 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1078 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1079 hmp->fchain.bref.methods = 1080 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1081 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1082 1083 hammer2_chain_core_init(&hmp->fchain); 1084 /* hmp->fchain.u.xxx is left NULL */ 1085 1086 /* 1087 * Install the volume header and initialize fields from 1088 * voldata. 1089 */ 1090 error = hammer2_install_volume_header(hmp); 1091 if (error) { 1092 hammer2_unmount_helper(mp, NULL, hmp); 1093 lockmgr(&hammer2_mntlk, LK_RELEASE); 1094 hammer2_vfs_unmount(mp, MNT_FORCE); 1095 return error; 1096 } 1097 1098 /* 1099 * Really important to get these right or flush will get 1100 * confused. 1101 */ 1102 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1103 kprintf("alloc spmp %p tid %016jx\n", 1104 hmp->spmp, hmp->voldata.mirror_tid); 1105 spmp = hmp->spmp; 1106 1107 /* 1108 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1109 * is inherited from the volume header. 1110 */ 1111 xid = 0; 1112 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1113 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1114 hmp->vchain.pmp = spmp; 1115 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1116 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1117 hmp->fchain.pmp = spmp; 1118 1119 /* 1120 * First locate the super-root inode, which is key 0 1121 * relative to the volume header's blockset. 1122 * 1123 * Then locate the root inode by scanning the directory keyspace 1124 * represented by the label. 1125 */ 1126 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1127 schain = hammer2_chain_lookup(&parent, &key_dummy, 1128 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1129 &cache_index, 0); 1130 hammer2_chain_lookup_done(parent); 1131 if (schain == NULL) { 1132 kprintf("hammer2_mount: invalid super-root\n"); 1133 hammer2_unmount_helper(mp, NULL, hmp); 1134 lockmgr(&hammer2_mntlk, LK_RELEASE); 1135 hammer2_vfs_unmount(mp, MNT_FORCE); 1136 return EINVAL; 1137 } 1138 if (schain->error) { 1139 kprintf("hammer2_mount: error %s reading super-root\n", 1140 hammer2_error_str(schain->error)); 1141 hammer2_chain_unlock(schain); 1142 hammer2_chain_drop(schain); 1143 schain = NULL; 1144 hammer2_unmount_helper(mp, NULL, hmp); 1145 lockmgr(&hammer2_mntlk, LK_RELEASE); 1146 hammer2_vfs_unmount(mp, MNT_FORCE); 1147 return EINVAL; 1148 } 1149 1150 /* 1151 * The super-root always uses an inode_tid of 1 when 1152 * creating PFSs. 1153 */ 1154 spmp->inode_tid = 1; 1155 spmp->modify_tid = schain->bref.modify_tid + 1; 1156 1157 /* 1158 * Sanity-check schain's pmp and finish initialization. 1159 * Any chain belonging to the super-root topology should 1160 * have a NULL pmp (not even set to spmp). 1161 */ 1162 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1163 KKASSERT(schain->pmp == NULL); 1164 spmp->pfs_clid = ripdata->meta.pfs_clid; 1165 1166 /* 1167 * Replace the dummy spmp->iroot with a real one. It's 1168 * easier to just do a wholesale replacement than to try 1169 * to update the chain and fixup the iroot fields. 1170 * 1171 * The returned inode is locked with the supplied cluster. 1172 */ 1173 cluster = hammer2_cluster_from_chain(schain); 1174 hammer2_inode_drop(spmp->iroot); 1175 spmp->iroot = NULL; 1176 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1177 spmp->spmp_hmp = hmp; 1178 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1179 spmp->pfs_hmps[0] = hmp; 1180 hammer2_inode_ref(spmp->iroot); 1181 hammer2_inode_unlock(spmp->iroot); 1182 hammer2_cluster_unlock(cluster); 1183 hammer2_cluster_drop(cluster); 1184 schain = NULL; 1185 /* leave spmp->iroot with one ref */ 1186 1187 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1188 error = hammer2_recovery(hmp); 1189 /* XXX do something with error */ 1190 } 1191 hammer2_update_pmps(hmp); 1192 hammer2_iocom_init(hmp); 1193 1194 /* 1195 * Ref the cluster management messaging descriptor. The mount 1196 * program deals with the other end of the communications pipe. 1197 * 1198 * Root mounts typically do not supply one. 1199 */ 1200 if (info.cluster_fd >= 0) { 1201 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1202 if (fp) { 1203 hammer2_cluster_reconnect(hmp, fp); 1204 } else { 1205 kprintf("hammer2_mount: bad cluster_fd!\n"); 1206 } 1207 } 1208 } else { 1209 spmp = hmp->spmp; 1210 if (info.hflags & HMNT2_DEVFLAGS) { 1211 kprintf("hammer2: Warning: mount flags pertaining " 1212 "to the whole device may only be specified " 1213 "on the first mount of the device: %08x\n", 1214 info.hflags & HMNT2_DEVFLAGS); 1215 } 1216 } 1217 1218 /* 1219 * Force local mount (disassociate all PFSs from their clusters). 1220 * Used primarily for debugging. 1221 */ 1222 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1223 1224 /* 1225 * Lookup the mount point under the media-localized super-root. 1226 * Scanning hammer2_pfslist doesn't help us because it represents 1227 * PFS cluster ids which can aggregate several named PFSs together. 1228 * 1229 * cluster->pmp will incorrectly point to spmp and must be fixed 1230 * up later on. 1231 */ 1232 hammer2_inode_lock(spmp->iroot, 0); 1233 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1234 lhc = hammer2_dirhash(label, strlen(label)); 1235 chain = hammer2_chain_lookup(&parent, &key_next, 1236 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1237 &cache_index, 0); 1238 while (chain) { 1239 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1240 strcmp(label, chain->data->ipdata.filename) == 0) { 1241 break; 1242 } 1243 chain = hammer2_chain_next(&parent, chain, &key_next, 1244 key_next, 1245 lhc + HAMMER2_DIRHASH_LOMASK, 1246 &cache_index, 0); 1247 } 1248 if (parent) { 1249 hammer2_chain_unlock(parent); 1250 hammer2_chain_drop(parent); 1251 } 1252 hammer2_inode_unlock(spmp->iroot); 1253 1254 /* 1255 * PFS could not be found? 1256 */ 1257 if (chain == NULL) { 1258 kprintf("hammer2_mount: PFS label not found\n"); 1259 hammer2_unmount_helper(mp, NULL, hmp); 1260 lockmgr(&hammer2_mntlk, LK_RELEASE); 1261 hammer2_vfs_unmount(mp, MNT_FORCE); 1262 1263 return EINVAL; 1264 } 1265 1266 /* 1267 * Acquire the pmp structure (it should have already been allocated 1268 * via hammer2_update_pmps() so do not pass cluster in to add to 1269 * available chains). 1270 * 1271 * Check if the cluster has already been mounted. A cluster can 1272 * only be mounted once, use null mounts to mount additional copies. 1273 */ 1274 ripdata = &chain->data->ipdata; 1275 bref = chain->bref; 1276 pmp = hammer2_pfsalloc(NULL, ripdata, 1277 bref.modify_tid, force_local); 1278 hammer2_chain_unlock(chain); 1279 hammer2_chain_drop(chain); 1280 1281 /* 1282 * Finish the mount 1283 */ 1284 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1285 1286 if (pmp->mp) { 1287 kprintf("hammer2_mount: PFS already mounted!\n"); 1288 hammer2_unmount_helper(mp, NULL, hmp); 1289 lockmgr(&hammer2_mntlk, LK_RELEASE); 1290 hammer2_vfs_unmount(mp, MNT_FORCE); 1291 1292 return EBUSY; 1293 } 1294 1295 pmp->hflags = info.hflags; 1296 mp->mnt_flag = MNT_LOCAL; 1297 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1298 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1299 1300 /* 1301 * required mount structure initializations 1302 */ 1303 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1304 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1305 1306 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1307 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1308 1309 /* 1310 * Optional fields 1311 */ 1312 mp->mnt_iosize_max = MAXPHYS; 1313 1314 /* 1315 * Connect up mount pointers. 1316 */ 1317 hammer2_mount_helper(mp, pmp); 1318 1319 lockmgr(&hammer2_mntlk, LK_RELEASE); 1320 1321 /* 1322 * Finish setup 1323 */ 1324 vfs_getnewfsid(mp); 1325 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1326 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1327 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1328 1329 if (path) { 1330 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1331 MNAMELEN - 1, &size); 1332 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1333 } /* else root mount, already in there */ 1334 1335 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1336 if (path) { 1337 copyinstr(path, mp->mnt_stat.f_mntonname, 1338 sizeof(mp->mnt_stat.f_mntonname) - 1, 1339 &size); 1340 } else { 1341 /* root mount */ 1342 mp->mnt_stat.f_mntonname[0] = '/'; 1343 } 1344 1345 /* 1346 * Initial statfs to prime mnt_stat. 1347 */ 1348 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1349 1350 return 0; 1351 } 1352 1353 /* 1354 * Scan PFSs under the super-root and create hammer2_pfs structures. 1355 */ 1356 static 1357 void 1358 hammer2_update_pmps(hammer2_dev_t *hmp) 1359 { 1360 const hammer2_inode_data_t *ripdata; 1361 hammer2_chain_t *parent; 1362 hammer2_chain_t *chain; 1363 hammer2_blockref_t bref; 1364 hammer2_dev_t *force_local; 1365 hammer2_pfs_t *spmp; 1366 hammer2_pfs_t *pmp; 1367 hammer2_key_t key_next; 1368 int cache_index = -1; 1369 1370 /* 1371 * Force local mount (disassociate all PFSs from their clusters). 1372 * Used primarily for debugging. 1373 */ 1374 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1375 1376 /* 1377 * Lookup mount point under the media-localized super-root. 1378 * 1379 * cluster->pmp will incorrectly point to spmp and must be fixed 1380 * up later on. 1381 */ 1382 spmp = hmp->spmp; 1383 hammer2_inode_lock(spmp->iroot, 0); 1384 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1385 chain = hammer2_chain_lookup(&parent, &key_next, 1386 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1387 &cache_index, 0); 1388 while (chain) { 1389 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1390 continue; 1391 ripdata = &chain->data->ipdata; 1392 bref = chain->bref; 1393 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename); 1394 1395 pmp = hammer2_pfsalloc(chain, ripdata, 1396 bref.modify_tid, force_local); 1397 chain = hammer2_chain_next(&parent, chain, &key_next, 1398 key_next, HAMMER2_KEY_MAX, 1399 &cache_index, 0); 1400 } 1401 if (parent) { 1402 hammer2_chain_unlock(parent); 1403 hammer2_chain_drop(parent); 1404 } 1405 hammer2_inode_unlock(spmp->iroot); 1406 } 1407 1408 static 1409 int 1410 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1411 struct vnode *devvp, struct ucred *cred) 1412 { 1413 int error; 1414 1415 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1416 error = hammer2_recovery(hmp); 1417 } else { 1418 error = 0; 1419 } 1420 return error; 1421 } 1422 1423 static 1424 int 1425 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1426 { 1427 hammer2_pfs_t *pmp; 1428 int flags; 1429 int error = 0; 1430 1431 pmp = MPTOPMP(mp); 1432 1433 if (pmp == NULL) 1434 return(0); 1435 1436 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1437 1438 /* 1439 * If mount initialization proceeded far enough we must flush 1440 * its vnodes and sync the underlying mount points. Three syncs 1441 * are required to fully flush the filesystem (freemap updates lag 1442 * by one flush, and one extra for safety). 1443 */ 1444 if (mntflags & MNT_FORCE) 1445 flags = FORCECLOSE; 1446 else 1447 flags = 0; 1448 if (pmp->iroot) { 1449 error = vflush(mp, 0, flags); 1450 if (error) 1451 goto failed; 1452 hammer2_vfs_sync(mp, MNT_WAIT); 1453 hammer2_vfs_sync(mp, MNT_WAIT); 1454 hammer2_vfs_sync(mp, MNT_WAIT); 1455 } 1456 1457 /* 1458 * Cleanup the frontend support XOPS threads 1459 */ 1460 hammer2_xop_helper_cleanup(pmp); 1461 1462 if (pmp->mp) 1463 hammer2_unmount_helper(mp, pmp, NULL); 1464 1465 error = 0; 1466 failed: 1467 lockmgr(&hammer2_mntlk, LK_RELEASE); 1468 1469 return (error); 1470 } 1471 1472 /* 1473 * Mount helper, hook the system mount into our PFS. 1474 * The mount lock is held. 1475 * 1476 * We must bump the mount_count on related devices for any 1477 * mounted PFSs. 1478 */ 1479 static 1480 void 1481 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1482 { 1483 hammer2_cluster_t *cluster; 1484 hammer2_chain_t *rchain; 1485 int i; 1486 1487 mp->mnt_data = (qaddr_t)pmp; 1488 pmp->mp = mp; 1489 1490 /* 1491 * After pmp->mp is set we have to adjust hmp->mount_count. 1492 */ 1493 cluster = &pmp->iroot->cluster; 1494 for (i = 0; i < cluster->nchains; ++i) { 1495 rchain = cluster->array[i].chain; 1496 if (rchain == NULL) 1497 continue; 1498 ++rchain->hmp->mount_count; 1499 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1500 rchain->hmp, rchain->hmp->mount_count); 1501 } 1502 1503 /* 1504 * Create missing Xop threads 1505 */ 1506 hammer2_xop_helper_create(pmp); 1507 } 1508 1509 /* 1510 * Mount helper, unhook the system mount from our PFS. 1511 * The mount lock is held. 1512 * 1513 * If hmp is supplied a mount responsible for being the first to open 1514 * the block device failed and the block device and all PFSs using the 1515 * block device must be cleaned up. 1516 * 1517 * If pmp is supplied multiple devices might be backing the PFS and each 1518 * must be disconnected. This might not be the last PFS using some of the 1519 * underlying devices. Also, we have to adjust our hmp->mount_count 1520 * accounting for the devices backing the pmp which is now undergoing an 1521 * unmount. 1522 */ 1523 static 1524 void 1525 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1526 { 1527 hammer2_cluster_t *cluster; 1528 hammer2_chain_t *rchain; 1529 struct vnode *devvp; 1530 int dumpcnt; 1531 int ronly = 0; 1532 int i; 1533 1534 /* 1535 * If no device supplied this is a high-level unmount and we have to 1536 * to disconnect the mount, adjust mount_count, and locate devices 1537 * that might now have no mounts. 1538 */ 1539 if (pmp) { 1540 KKASSERT(hmp == NULL); 1541 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1542 pmp->mp = NULL; 1543 mp->mnt_data = NULL; 1544 1545 /* 1546 * After pmp->mp is cleared we have to account for 1547 * mount_count. 1548 */ 1549 cluster = &pmp->iroot->cluster; 1550 for (i = 0; i < cluster->nchains; ++i) { 1551 rchain = cluster->array[i].chain; 1552 if (rchain == NULL) 1553 continue; 1554 --rchain->hmp->mount_count; 1555 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n", 1556 rchain->hmp, rchain->hmp->mount_count); 1557 /* scrapping hmp now may invalidate the pmp */ 1558 } 1559 again: 1560 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1561 if (hmp->mount_count == 0) { 1562 hammer2_unmount_helper(NULL, NULL, hmp); 1563 goto again; 1564 } 1565 } 1566 return; 1567 } 1568 1569 /* 1570 * Try to terminate the block device. We can't terminate it if 1571 * there are still PFSs referencing it. 1572 */ 1573 kprintf("hammer2_unmount hmp=%p mount_count=%d\n", 1574 hmp, hmp->mount_count); 1575 if (hmp->mount_count) 1576 return; 1577 1578 hammer2_pfsfree_scan(hmp); 1579 hammer2_dev_exlock(hmp); /* XXX order */ 1580 1581 /* 1582 * Cycle the volume data lock as a safety (probably not needed any 1583 * more). To ensure everything is out we need to flush at least 1584 * three times. (1) The running of the sideq can dirty the 1585 * filesystem, (2) A normal flush can dirty the freemap, and 1586 * (3) ensure that the freemap is fully synchronized. 1587 * 1588 * The next mount's recovery scan can clean everything up but we want 1589 * to leave the filesystem in a 100% clean state on a normal unmount. 1590 */ 1591 #if 0 1592 hammer2_voldata_lock(hmp); 1593 hammer2_voldata_unlock(hmp); 1594 #endif 1595 hammer2_iocom_uninit(hmp); 1596 1597 if ((hmp->vchain.flags | hmp->fchain.flags) & 1598 HAMMER2_CHAIN_FLUSH_MASK) { 1599 kprintf("hammer2_unmount: chains left over " 1600 "after final sync\n"); 1601 kprintf(" vchain %08x\n", hmp->vchain.flags); 1602 kprintf(" fchain %08x\n", hmp->fchain.flags); 1603 1604 if (hammer2_debug & 0x0010) 1605 Debugger("entered debugger"); 1606 } 1607 1608 KKASSERT(hmp->spmp == NULL); 1609 1610 /* 1611 * Finish up with the device vnode 1612 */ 1613 if ((devvp = hmp->devvp) != NULL) { 1614 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1615 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1616 hmp->devvp = NULL; 1617 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1618 vn_unlock(devvp); 1619 vrele(devvp); 1620 devvp = NULL; 1621 } 1622 1623 /* 1624 * Clear vchain/fchain flags that might prevent final cleanup 1625 * of these chains. 1626 */ 1627 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1628 atomic_add_long(&hammer2_count_modified_chains, -1); 1629 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1630 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1631 } 1632 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1633 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1634 } 1635 1636 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1637 atomic_add_long(&hammer2_count_modified_chains, -1); 1638 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1639 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1640 } 1641 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1642 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1643 } 1644 1645 /* 1646 * Final drop of embedded freemap root chain to 1647 * clean up fchain.core (fchain structure is not 1648 * flagged ALLOCATED so it is cleaned out and then 1649 * left to rot). 1650 */ 1651 hammer2_chain_drop(&hmp->fchain); 1652 1653 /* 1654 * Final drop of embedded volume root chain to clean 1655 * up vchain.core (vchain structure is not flagged 1656 * ALLOCATED so it is cleaned out and then left to 1657 * rot). 1658 */ 1659 dumpcnt = 50; 1660 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1661 dumpcnt = 50; 1662 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1663 hammer2_dev_unlock(hmp); 1664 hammer2_chain_drop(&hmp->vchain); 1665 1666 hammer2_io_cleanup(hmp, &hmp->iotree); 1667 if (hmp->iofree_count) { 1668 kprintf("io_cleanup: %d I/O's left hanging\n", 1669 hmp->iofree_count); 1670 } 1671 1672 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1673 kmalloc_destroy(&hmp->mchain); 1674 kfree(hmp, M_HAMMER2); 1675 } 1676 1677 int 1678 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1679 ino_t ino, struct vnode **vpp) 1680 { 1681 hammer2_xop_lookup_t *xop; 1682 hammer2_pfs_t *pmp; 1683 hammer2_inode_t *ip; 1684 hammer2_tid_t inum; 1685 int error; 1686 1687 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1688 1689 error = 0; 1690 pmp = MPTOPMP(mp); 1691 1692 /* 1693 * Easy if we already have it cached 1694 */ 1695 ip = hammer2_inode_lookup(pmp, inum); 1696 if (ip) { 1697 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1698 *vpp = hammer2_igetv(ip, &error); 1699 hammer2_inode_unlock(ip); 1700 hammer2_inode_drop(ip); /* from lookup */ 1701 1702 return error; 1703 } 1704 1705 /* 1706 * Otherwise we have to find the inode 1707 */ 1708 xop = hammer2_xop_alloc(pmp->iroot, 0); 1709 xop->lhc = inum; 1710 hammer2_xop_start(&xop->head, hammer2_xop_lookup); 1711 error = hammer2_xop_collect(&xop->head, 0); 1712 1713 if (error == 0) { 1714 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) { 1715 kprintf("vget: no collect error but also no rdata\n"); 1716 kprintf("xop %p\n", xop); 1717 while ((hammer2_debug & 0x80000) == 0) { 1718 tsleep(xop, PCATCH, "wait", hz * 10); 1719 } 1720 ip = NULL; 1721 } else { 1722 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1); 1723 } 1724 } 1725 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1726 1727 if (ip) { 1728 *vpp = hammer2_igetv(ip, &error); 1729 hammer2_inode_unlock(ip); 1730 } else { 1731 *vpp = NULL; 1732 error = ENOENT; 1733 } 1734 return (error); 1735 } 1736 1737 static 1738 int 1739 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1740 { 1741 hammer2_pfs_t *pmp; 1742 struct vnode *vp; 1743 int error; 1744 1745 pmp = MPTOPMP(mp); 1746 if (pmp->iroot == NULL) { 1747 *vpp = NULL; 1748 return EINVAL; 1749 } 1750 1751 error = 0; 1752 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1753 1754 while (pmp->inode_tid == 0) { 1755 hammer2_xop_ipcluster_t *xop; 1756 hammer2_inode_meta_t *meta; 1757 1758 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1759 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1760 error = hammer2_xop_collect(&xop->head, 0); 1761 1762 if (error == 0) { 1763 meta = &xop->head.cluster.focus->data->ipdata.meta; 1764 pmp->iroot->meta = *meta; 1765 pmp->inode_tid = meta->pfs_inum + 1; 1766 if (pmp->inode_tid < HAMMER2_INODE_START) 1767 pmp->inode_tid = HAMMER2_INODE_START; 1768 pmp->modify_tid = 1769 xop->head.cluster.focus->bref.modify_tid + 1; 1770 kprintf("PFS: Starting inode %jd\n", 1771 (intmax_t)pmp->inode_tid); 1772 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1773 pmp->inode_tid, pmp->modify_tid); 1774 wakeup(&pmp->iroot); 1775 1776 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1777 1778 /* 1779 * Prime the mount info. 1780 */ 1781 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1782 break; 1783 } 1784 1785 /* 1786 * Loop, try again 1787 */ 1788 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1789 hammer2_inode_unlock(pmp->iroot); 1790 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1791 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1792 if (error == EINTR) 1793 break; 1794 } 1795 1796 if (error) { 1797 hammer2_inode_unlock(pmp->iroot); 1798 *vpp = NULL; 1799 } else { 1800 vp = hammer2_igetv(pmp->iroot, &error); 1801 hammer2_inode_unlock(pmp->iroot); 1802 *vpp = vp; 1803 } 1804 1805 return (error); 1806 } 1807 1808 /* 1809 * Filesystem status 1810 * 1811 * XXX incorporate ipdata->meta.inode_quota and data_quota 1812 */ 1813 static 1814 int 1815 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1816 { 1817 hammer2_pfs_t *pmp; 1818 hammer2_dev_t *hmp; 1819 hammer2_blockref_t bref; 1820 int i; 1821 1822 /* 1823 * NOTE: iroot might not have validated the cluster yet. 1824 */ 1825 pmp = MPTOPMP(mp); 1826 1827 mp->mnt_stat.f_files = 0; 1828 mp->mnt_stat.f_ffree = 0; 1829 mp->mnt_stat.f_blocks = 0; 1830 mp->mnt_stat.f_bfree = 0; 1831 mp->mnt_stat.f_bavail = 0; 1832 1833 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1834 hmp = pmp->pfs_hmps[i]; 1835 if (hmp == NULL) 1836 continue; 1837 if (pmp->iroot->cluster.array[i].chain) 1838 bref = pmp->iroot->cluster.array[i].chain->bref; 1839 else 1840 bzero(&bref, sizeof(bref)); 1841 1842 mp->mnt_stat.f_files = bref.inode_count; 1843 mp->mnt_stat.f_ffree = 0; 1844 #if 0 1845 mp->mnt_stat.f_blocks = (bref.data_count + 1846 hmp->voldata.allocator_free) / 1847 mp->mnt_vstat.f_bsize; 1848 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1849 mp->mnt_vstat.f_bsize; 1850 #endif 1851 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / 1852 mp->mnt_vstat.f_bsize; 1853 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1854 mp->mnt_vstat.f_bsize; 1855 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1856 1857 *sbp = mp->mnt_stat; 1858 } 1859 return (0); 1860 } 1861 1862 static 1863 int 1864 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1865 { 1866 hammer2_pfs_t *pmp; 1867 hammer2_dev_t *hmp; 1868 hammer2_blockref_t bref; 1869 int i; 1870 1871 /* 1872 * NOTE: iroot might not have validated the cluster yet. 1873 */ 1874 pmp = MPTOPMP(mp); 1875 1876 mp->mnt_vstat.f_bsize = 0; 1877 mp->mnt_vstat.f_files = 0; 1878 mp->mnt_vstat.f_ffree = 0; 1879 mp->mnt_vstat.f_blocks = 0; 1880 mp->mnt_vstat.f_bfree = 0; 1881 mp->mnt_vstat.f_bavail = 0; 1882 1883 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1884 hmp = pmp->pfs_hmps[i]; 1885 if (hmp == NULL) 1886 continue; 1887 if (pmp->iroot->cluster.array[i].chain) 1888 bref = pmp->iroot->cluster.array[i].chain->bref; 1889 else 1890 bzero(&bref, sizeof(bref)); 1891 1892 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1893 mp->mnt_vstat.f_files = bref.inode_count; 1894 mp->mnt_vstat.f_ffree = 0; 1895 #if 0 1896 mp->mnt_vstat.f_blocks = (bref.data_count + 1897 hmp->voldata.allocator_free) / 1898 mp->mnt_vstat.f_bsize; 1899 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1900 mp->mnt_vstat.f_bsize; 1901 #endif 1902 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / 1903 mp->mnt_vstat.f_bsize; 1904 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1905 mp->mnt_vstat.f_bsize; 1906 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1907 1908 *sbp = mp->mnt_vstat; 1909 } 1910 return (0); 1911 } 1912 1913 /* 1914 * Mount-time recovery (RW mounts) 1915 * 1916 * Updates to the free block table are allowed to lag flushes by one 1917 * transaction. In case of a crash, then on a fresh mount we must do an 1918 * incremental scan of the last committed transaction id and make sure that 1919 * all related blocks have been marked allocated. 1920 * 1921 * The super-root topology and each PFS has its own transaction id domain, 1922 * so we must track PFS boundary transitions. 1923 */ 1924 struct hammer2_recovery_elm { 1925 TAILQ_ENTRY(hammer2_recovery_elm) entry; 1926 hammer2_chain_t *chain; 1927 hammer2_tid_t sync_tid; 1928 }; 1929 1930 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 1931 1932 struct hammer2_recovery_info { 1933 struct hammer2_recovery_list list; 1934 hammer2_tid_t mtid; 1935 int depth; 1936 }; 1937 1938 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 1939 hammer2_chain_t *parent, 1940 struct hammer2_recovery_info *info, 1941 hammer2_tid_t sync_tid); 1942 1943 #define HAMMER2_RECOVERY_MAXDEPTH 10 1944 1945 static 1946 int 1947 hammer2_recovery(hammer2_dev_t *hmp) 1948 { 1949 struct hammer2_recovery_info info; 1950 struct hammer2_recovery_elm *elm; 1951 hammer2_chain_t *parent; 1952 hammer2_tid_t sync_tid; 1953 hammer2_tid_t mirror_tid; 1954 int error; 1955 int cumulative_error = 0; 1956 1957 hammer2_trans_init(hmp->spmp, 0); 1958 1959 sync_tid = hmp->voldata.freemap_tid; 1960 mirror_tid = hmp->voldata.mirror_tid; 1961 1962 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 1963 if (sync_tid >= mirror_tid) { 1964 kprintf(" no recovery needed\n"); 1965 } else { 1966 kprintf(" freemap recovery %016jx-%016jx\n", 1967 sync_tid + 1, mirror_tid); 1968 } 1969 1970 TAILQ_INIT(&info.list); 1971 info.depth = 0; 1972 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1973 cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 1974 hammer2_chain_lookup_done(parent); 1975 1976 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 1977 TAILQ_REMOVE(&info.list, elm, entry); 1978 parent = elm->chain; 1979 sync_tid = elm->sync_tid; 1980 kfree(elm, M_HAMMER2); 1981 1982 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 1983 error = hammer2_recovery_scan(hmp, parent, &info, 1984 hmp->voldata.freemap_tid); 1985 hammer2_chain_unlock(parent); 1986 hammer2_chain_drop(parent); /* drop elm->chain ref */ 1987 if (error) 1988 cumulative_error = error; 1989 } 1990 hammer2_trans_done(hmp->spmp); 1991 1992 return cumulative_error; 1993 } 1994 1995 static 1996 int 1997 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 1998 struct hammer2_recovery_info *info, 1999 hammer2_tid_t sync_tid) 2000 { 2001 const hammer2_inode_data_t *ripdata; 2002 hammer2_chain_t *chain; 2003 hammer2_blockref_t bref; 2004 int cache_index; 2005 int cumulative_error = 0; 2006 int error; 2007 int first; 2008 2009 /* 2010 * Adjust freemap to ensure that the block(s) are marked allocated. 2011 */ 2012 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2013 hammer2_freemap_adjust(hmp, &parent->bref, 2014 HAMMER2_FREEMAP_DORECOVER); 2015 } 2016 2017 /* 2018 * Check type for recursive scan 2019 */ 2020 switch(parent->bref.type) { 2021 case HAMMER2_BREF_TYPE_VOLUME: 2022 /* data already instantiated */ 2023 break; 2024 case HAMMER2_BREF_TYPE_INODE: 2025 /* 2026 * Must instantiate data for DIRECTDATA test and also 2027 * for recursion. 2028 */ 2029 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2030 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2031 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2032 /* not applicable to recovery scan */ 2033 hammer2_chain_unlock(parent); 2034 return 0; 2035 } 2036 hammer2_chain_unlock(parent); 2037 break; 2038 case HAMMER2_BREF_TYPE_INDIRECT: 2039 /* 2040 * Must instantiate data for recursion 2041 */ 2042 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2043 hammer2_chain_unlock(parent); 2044 break; 2045 case HAMMER2_BREF_TYPE_DATA: 2046 case HAMMER2_BREF_TYPE_FREEMAP: 2047 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2048 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2049 /* not applicable to recovery scan */ 2050 return 0; 2051 break; 2052 default: 2053 return EDOM; 2054 } 2055 2056 /* 2057 * Defer operation if depth limit reached or if we are crossing a 2058 * PFS boundary. 2059 */ 2060 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2061 struct hammer2_recovery_elm *elm; 2062 2063 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2064 elm->chain = parent; 2065 elm->sync_tid = sync_tid; 2066 hammer2_chain_ref(parent); 2067 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2068 /* unlocked by caller */ 2069 2070 return(0); 2071 } 2072 2073 2074 /* 2075 * Recursive scan of the last flushed transaction only. We are 2076 * doing this without pmp assignments so don't leave the chains 2077 * hanging around after we are done with them. 2078 */ 2079 cache_index = 0; 2080 chain = NULL; 2081 first = 1; 2082 2083 while (hammer2_chain_scan(parent, &chain, &bref, 2084 &first, &cache_index, 2085 HAMMER2_LOOKUP_NODATA) != NULL) { 2086 /* 2087 * If this is a leaf 2088 */ 2089 if (chain == NULL) { 2090 if (bref.mirror_tid > sync_tid) { 2091 hammer2_freemap_adjust(hmp, &bref, 2092 HAMMER2_FREEMAP_DORECOVER); 2093 } 2094 continue; 2095 } 2096 2097 /* 2098 * This may or may not be a recursive node. 2099 */ 2100 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2101 if (bref.mirror_tid > sync_tid) { 2102 ++info->depth; 2103 error = hammer2_recovery_scan(hmp, chain, 2104 info, sync_tid); 2105 --info->depth; 2106 if (error) 2107 cumulative_error = error; 2108 } 2109 2110 /* 2111 * Flush the recovery at the PFS boundary to stage it for 2112 * the final flush of the super-root topology. 2113 */ 2114 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2115 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2116 hammer2_flush(chain, HAMMER2_FLUSH_TOP); 2117 } 2118 } 2119 2120 return cumulative_error; 2121 } 2122 2123 /* 2124 * Sync a mount point; this is called on a per-mount basis from the 2125 * filesystem syncer process periodically and whenever a user issues 2126 * a sync. 2127 */ 2128 int 2129 hammer2_vfs_sync(struct mount *mp, int waitfor) 2130 { 2131 hammer2_xop_flush_t *xop; 2132 struct hammer2_sync_info info; 2133 hammer2_inode_t *iroot; 2134 hammer2_pfs_t *pmp; 2135 int flags; 2136 int error; 2137 2138 pmp = MPTOPMP(mp); 2139 iroot = pmp->iroot; 2140 KKASSERT(iroot); 2141 KKASSERT(iroot->pmp == pmp); 2142 2143 /* 2144 * We can't acquire locks on existing vnodes while in a transaction 2145 * without risking a deadlock. This assumes that vfsync() can be 2146 * called without the vnode locked (which it can in DragonFly). 2147 * Otherwise we'd have to implement a multi-pass or flag the lock 2148 * failures and retry. 2149 * 2150 * The reclamation code interlocks with the sync list's token 2151 * (by removing the vnode from the scan list) before unlocking 2152 * the inode, giving us time to ref the inode. 2153 */ 2154 /*flags = VMSC_GETVP;*/ 2155 flags = 0; 2156 if (waitfor & MNT_LAZY) 2157 flags |= VMSC_ONEPASS; 2158 2159 /* 2160 * Preflush the vnodes using a normal transaction before interlocking 2161 * with a flush transaction. We do this to try to run as much of 2162 * the compression as possible outside the flush transaction. 2163 * 2164 * For efficiency do an async pass before making sure with a 2165 * synchronous pass on all related buffer cache buffers. 2166 */ 2167 hammer2_trans_init(pmp, 0); 2168 info.error = 0; 2169 info.waitfor = MNT_NOWAIT; 2170 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2171 info.waitfor = MNT_WAIT; 2172 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2173 hammer2_trans_done(pmp); 2174 2175 /* 2176 * Start our flush transaction. This does not return until all 2177 * concurrent transactions have completed and will prevent any 2178 * new transactions from running concurrently, except for the 2179 * buffer cache transactions. 2180 * 2181 * NOTE! It is still possible for the paging code to push pages 2182 * out via a UIO_NOCOPY hammer2_vop_write() during the main 2183 * flush. 2184 */ 2185 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2186 hammer2_inode_run_sideq(pmp); 2187 2188 info.error = 0; 2189 info.waitfor = MNT_NOWAIT; 2190 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2191 info.waitfor = MNT_WAIT; 2192 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2193 hammer2_bioq_sync(pmp); 2194 2195 /* 2196 * Use the XOP interface to concurrently flush all nodes to 2197 * synchronize the PFSROOT subtopology to the media. A standard 2198 * end-of-scan ENOENT error indicates cluster sufficiency. 2199 * 2200 * Note that this flush will not be visible on crash recovery until 2201 * we flush the super-root topology in the next loop. 2202 * 2203 * XXX For now wait for all flushes to complete. 2204 */ 2205 if (iroot) { 2206 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 2207 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 2208 error = hammer2_xop_collect(&xop->head, 2209 HAMMER2_XOP_COLLECT_WAITALL); 2210 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2211 if (error == ENOENT) 2212 error = 0; 2213 } else { 2214 error = 0; 2215 } 2216 hammer2_trans_done(pmp); 2217 2218 return (error); 2219 } 2220 2221 /* 2222 * Sync passes. 2223 * 2224 * Note that we ignore the tranasction mtid we got above. Instead, 2225 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 2226 * transactions. 2227 */ 2228 static int 2229 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 2230 { 2231 struct hammer2_sync_info *info = data; 2232 hammer2_inode_t *ip; 2233 int error; 2234 2235 /* 2236 * Degenerate cases. Note that ip == NULL typically means the 2237 * syncer vnode itself and we don't want to vclrisdirty() in that 2238 * situation. 2239 */ 2240 ip = VTOI(vp); 2241 if (ip == NULL) { 2242 return(0); 2243 } 2244 if (vp->v_type == VNON || vp->v_type == VBAD) { 2245 vclrisdirty(vp); 2246 return(0); 2247 } 2248 2249 /* 2250 * VOP_FSYNC will start a new transaction so replicate some code 2251 * here to do it inline (see hammer2_vop_fsync()). 2252 * 2253 * WARNING: The vfsync interacts with the buffer cache and might 2254 * block, we can't hold the inode lock at that time. 2255 * However, we MUST ref ip before blocking to ensure that 2256 * it isn't ripped out from under us (since we do not 2257 * hold a lock on the vnode). 2258 */ 2259 hammer2_inode_ref(ip); 2260 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2261 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2262 vfsync(vp, info->waitfor, 1, NULL, NULL); 2263 if (ip->flags & (HAMMER2_INODE_RESIZED | 2264 HAMMER2_INODE_MODIFIED)) { 2265 hammer2_inode_lock(ip, 0); 2266 hammer2_inode_chain_sync(ip); 2267 hammer2_inode_unlock(ip); 2268 } 2269 } 2270 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2271 RB_EMPTY(&vp->v_rbdirty_tree)) { 2272 vclrisdirty(vp); 2273 } 2274 2275 hammer2_inode_drop(ip); 2276 #if 1 2277 error = 0; 2278 if (error) 2279 info->error = error; 2280 #endif 2281 return(0); 2282 } 2283 2284 static 2285 int 2286 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2287 { 2288 hammer2_inode_t *ip; 2289 2290 KKASSERT(MAXFIDSZ >= 16); 2291 ip = VTOI(vp); 2292 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2293 fhp->fid_ext = 0; 2294 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2295 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2296 2297 return 0; 2298 } 2299 2300 static 2301 int 2302 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2303 struct fid *fhp, struct vnode **vpp) 2304 { 2305 hammer2_pfs_t *pmp; 2306 hammer2_tid_t inum; 2307 int error; 2308 2309 pmp = MPTOPMP(mp); 2310 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2311 if (vpp) { 2312 if (inum == 1) 2313 error = hammer2_vfs_root(mp, vpp); 2314 else 2315 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2316 } else { 2317 error = 0; 2318 } 2319 if (error) 2320 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2321 return error; 2322 } 2323 2324 static 2325 int 2326 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2327 int *exflagsp, struct ucred **credanonp) 2328 { 2329 hammer2_pfs_t *pmp; 2330 struct netcred *np; 2331 int error; 2332 2333 pmp = MPTOPMP(mp); 2334 np = vfs_export_lookup(mp, &pmp->export, nam); 2335 if (np) { 2336 *exflagsp = np->netc_exflags; 2337 *credanonp = &np->netc_anon; 2338 error = 0; 2339 } else { 2340 error = EACCES; 2341 } 2342 return error; 2343 } 2344 2345 /* 2346 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2347 * header into the HMP 2348 * 2349 * XXX read four volhdrs and use the one with the highest TID whos CRC 2350 * matches. 2351 * 2352 * XXX check iCRCs. 2353 * 2354 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2355 * nonexistant locations. 2356 * 2357 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2358 */ 2359 static 2360 int 2361 hammer2_install_volume_header(hammer2_dev_t *hmp) 2362 { 2363 hammer2_volume_data_t *vd; 2364 struct buf *bp; 2365 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2366 int error_reported; 2367 int error; 2368 int valid; 2369 int i; 2370 2371 error_reported = 0; 2372 error = 0; 2373 valid = 0; 2374 bp = NULL; 2375 2376 /* 2377 * There are up to 4 copies of the volume header (syncs iterate 2378 * between them so there is no single master). We don't trust the 2379 * volu_size field so we don't know precisely how large the filesystem 2380 * is, so depend on the OS to return an error if we go beyond the 2381 * block device's EOF. 2382 */ 2383 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2384 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2385 HAMMER2_VOLUME_BYTES, &bp); 2386 if (error) { 2387 brelse(bp); 2388 bp = NULL; 2389 continue; 2390 } 2391 2392 vd = (struct hammer2_volume_data *) bp->b_data; 2393 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2394 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2395 brelse(bp); 2396 bp = NULL; 2397 continue; 2398 } 2399 2400 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2401 /* XXX: Reversed-endianness filesystem */ 2402 kprintf("hammer2: reverse-endian filesystem detected"); 2403 brelse(bp); 2404 bp = NULL; 2405 continue; 2406 } 2407 2408 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2409 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2410 HAMMER2_VOLUME_ICRC0_SIZE); 2411 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2412 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2413 HAMMER2_VOLUME_ICRC1_SIZE); 2414 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2415 kprintf("hammer2 volume header crc " 2416 "mismatch copy #%d %08x/%08x\n", 2417 i, crc0, crc); 2418 error_reported = 1; 2419 brelse(bp); 2420 bp = NULL; 2421 continue; 2422 } 2423 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2424 valid = 1; 2425 hmp->voldata = *vd; 2426 hmp->volhdrno = i; 2427 } 2428 brelse(bp); 2429 bp = NULL; 2430 } 2431 if (valid) { 2432 hmp->volsync = hmp->voldata; 2433 error = 0; 2434 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2435 kprintf("hammer2: using volume header #%d\n", 2436 hmp->volhdrno); 2437 } 2438 } else { 2439 error = EINVAL; 2440 kprintf("hammer2: no valid volume headers found!\n"); 2441 } 2442 return (error); 2443 } 2444 2445 /* 2446 * This handles hysteresis on regular file flushes. Because the BIOs are 2447 * routed to a thread it is possible for an excessive number to build up 2448 * and cause long front-end stalls long before the runningbuffspace limit 2449 * is hit, so we implement hammer2_flush_pipe to control the 2450 * hysteresis. 2451 * 2452 * This is a particular problem when compression is used. 2453 */ 2454 void 2455 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2456 { 2457 atomic_add_int(&pmp->count_lwinprog, 1); 2458 } 2459 2460 void 2461 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2462 { 2463 int lwinprog; 2464 2465 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2466 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2467 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2468 atomic_clear_int(&pmp->count_lwinprog, 2469 HAMMER2_LWINPROG_WAITING); 2470 wakeup(&pmp->count_lwinprog); 2471 } 2472 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2473 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2474 atomic_clear_int(&pmp->count_lwinprog, 2475 HAMMER2_LWINPROG_WAITING0); 2476 wakeup(&pmp->count_lwinprog); 2477 } 2478 } 2479 2480 void 2481 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2482 { 2483 int lwinprog; 2484 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2485 HAMMER2_LWINPROG_WAITING0; 2486 2487 for (;;) { 2488 lwinprog = pmp->count_lwinprog; 2489 cpu_ccfence(); 2490 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2491 break; 2492 tsleep_interlock(&pmp->count_lwinprog, 0); 2493 atomic_set_int(&pmp->count_lwinprog, lwflag); 2494 lwinprog = pmp->count_lwinprog; 2495 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2496 break; 2497 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2498 } 2499 } 2500 2501 /* 2502 * Manage excessive memory resource use for chain and related 2503 * structures. 2504 */ 2505 void 2506 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2507 { 2508 uint32_t waiting; 2509 uint32_t count; 2510 uint32_t limit; 2511 #if 0 2512 static int zzticks; 2513 #endif 2514 2515 /* 2516 * Atomic check condition and wait. Also do an early speedup of 2517 * the syncer to try to avoid hitting the wait. 2518 */ 2519 for (;;) { 2520 waiting = pmp->inmem_dirty_chains; 2521 cpu_ccfence(); 2522 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2523 2524 limit = pmp->mp->mnt_nvnodelistsize / 10; 2525 if (limit < hammer2_limit_dirty_chains) 2526 limit = hammer2_limit_dirty_chains; 2527 if (limit < 1000) 2528 limit = 1000; 2529 2530 #if 0 2531 if ((int)(ticks - zzticks) > hz) { 2532 zzticks = ticks; 2533 kprintf("count %ld %ld\n", count, limit); 2534 } 2535 #endif 2536 2537 /* 2538 * Block if there are too many dirty chains present, wait 2539 * for the flush to clean some out. 2540 */ 2541 if (count > limit) { 2542 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2543 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2544 waiting, 2545 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2546 speedup_syncer(pmp->mp); 2547 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2548 "chnmem", hz); 2549 } 2550 continue; /* loop on success or fail */ 2551 } 2552 2553 /* 2554 * Try to start an early flush before we are forced to block. 2555 */ 2556 if (count > limit * 7 / 10) 2557 speedup_syncer(pmp->mp); 2558 break; 2559 } 2560 } 2561 2562 void 2563 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2564 { 2565 if (pmp) { 2566 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2567 } 2568 } 2569 2570 void 2571 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2572 { 2573 uint32_t waiting; 2574 2575 if (pmp == NULL) 2576 return; 2577 2578 for (;;) { 2579 waiting = pmp->inmem_dirty_chains; 2580 cpu_ccfence(); 2581 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2582 waiting, 2583 (waiting - 1) & 2584 ~HAMMER2_DIRTYCHAIN_WAITING)) { 2585 break; 2586 } 2587 } 2588 2589 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) 2590 wakeup(&pmp->inmem_dirty_chains); 2591 } 2592 2593 /* 2594 * Debugging 2595 */ 2596 void 2597 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2598 { 2599 hammer2_chain_t *scan; 2600 hammer2_chain_t *parent; 2601 2602 --*countp; 2603 if (*countp == 0) { 2604 kprintf("%*.*s...\n", tab, tab, ""); 2605 return; 2606 } 2607 if (*countp < 0) 2608 return; 2609 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2610 tab, tab, "", pfx, 2611 chain, chain->bref.type, 2612 chain->bref.key, chain->bref.keybits, 2613 chain->bref.mirror_tid); 2614 2615 kprintf("%*.*s [%08x] (%s) refs=%d", 2616 tab, tab, "", 2617 chain->flags, 2618 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2619 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2620 chain->refs); 2621 2622 parent = chain->parent; 2623 if (parent) 2624 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2625 tab, tab, "", 2626 parent, parent->flags, parent->refs); 2627 if (RB_EMPTY(&chain->core.rbtree)) { 2628 kprintf("\n"); 2629 } else { 2630 kprintf(" {\n"); 2631 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2632 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2633 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2634 kprintf("%*.*s}(%s)\n", tab, tab, "", 2635 chain->data->ipdata.filename); 2636 else 2637 kprintf("%*.*s}\n", tab, tab, ""); 2638 } 2639 } 2640