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_meta_read = 1; /* physical read-ahead */ 82 int hammer2_cluster_data_read = 4; /* physical read-ahead */ 83 int hammer2_cluster_write = 0; /* bdwrite() so later inval works */ 84 int hammer2_dedup_enable = 1; 85 int hammer2_always_compress = 0; /* always try to compress */ 86 int hammer2_inval_enable = 0; 87 int hammer2_flush_pipe = 100; 88 int hammer2_synchronous_flush = 1; 89 int hammer2_dio_count; 90 int hammer2_limit_dio = 256; 91 long hammer2_chain_allocs; 92 long hammer2_chain_frees; 93 long hammer2_limit_dirty_chains; 94 long hammer2_count_modified_chains; 95 long hammer2_iod_invals; 96 long hammer2_iod_file_read; 97 long hammer2_iod_meta_read; 98 long hammer2_iod_indr_read; 99 long hammer2_iod_fmap_read; 100 long hammer2_iod_volu_read; 101 long hammer2_iod_file_write; 102 long hammer2_iod_file_wembed; 103 long hammer2_iod_file_wzero; 104 long hammer2_iod_file_wdedup; 105 long hammer2_iod_meta_write; 106 long hammer2_iod_indr_write; 107 long hammer2_iod_fmap_write; 108 long hammer2_iod_volu_write; 109 110 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 111 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 112 "Buffer used for compression."); 113 114 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 115 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 116 "Buffer used for decompression."); 117 118 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 119 120 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 121 &hammer2_debug, 0, ""); 122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW, 123 &hammer2_cluster_meta_read, 0, ""); 124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW, 125 &hammer2_cluster_data_read, 0, ""); 126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW, 127 &hammer2_cluster_write, 0, ""); 128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 129 &hammer2_dedup_enable, 0, ""); 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW, 131 &hammer2_always_compress, 0, ""); 132 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW, 133 &hammer2_inval_enable, 0, ""); 134 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 135 &hammer2_flush_pipe, 0, ""); 136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW, 137 &hammer2_synchronous_flush, 0, ""); 138 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW, 139 &hammer2_chain_allocs, 0, ""); 140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW, 141 &hammer2_chain_frees, 0, ""); 142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 143 &hammer2_limit_dirty_chains, 0, ""); 144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW, 145 &hammer2_count_modified_chains, 0, ""); 146 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 147 &hammer2_dio_count, 0, ""); 148 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_dio, CTLFLAG_RW, 149 &hammer2_limit_dio, 0, ""); 150 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW, 152 &hammer2_iod_invals, 0, ""); 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 154 &hammer2_iod_file_read, 0, ""); 155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 156 &hammer2_iod_meta_read, 0, ""); 157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 158 &hammer2_iod_indr_read, 0, ""); 159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 160 &hammer2_iod_fmap_read, 0, ""); 161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 162 &hammer2_iod_volu_read, 0, ""); 163 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 165 &hammer2_iod_file_write, 0, ""); 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW, 167 &hammer2_iod_file_wembed, 0, ""); 168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW, 169 &hammer2_iod_file_wzero, 0, ""); 170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW, 171 &hammer2_iod_file_wdedup, 0, ""); 172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 173 &hammer2_iod_meta_write, 0, ""); 174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 175 &hammer2_iod_indr_write, 0, ""); 176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 177 &hammer2_iod_fmap_write, 0, ""); 178 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 179 &hammer2_iod_volu_write, 0, ""); 180 181 long hammer2_check_icrc32; 182 long hammer2_check_xxhash64; 183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW, 184 &hammer2_check_icrc32, 0, ""); 185 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW, 186 &hammer2_check_xxhash64, 0, ""); 187 188 static int hammer2_vfs_init(struct vfsconf *conf); 189 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 190 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 191 struct ucred *cred); 192 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 193 struct vnode *, struct ucred *); 194 static int hammer2_recovery(hammer2_dev_t *hmp); 195 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 196 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 197 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 198 struct ucred *cred); 199 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 200 struct ucred *cred); 201 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 202 struct fid *fhp, struct vnode **vpp); 203 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 204 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 205 int *exflagsp, struct ucred **credanonp); 206 207 static int hammer2_install_volume_header(hammer2_dev_t *hmp); 208 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 209 210 static void hammer2_update_pmps(hammer2_dev_t *hmp); 211 212 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 213 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 214 hammer2_dev_t *hmp); 215 216 /* 217 * HAMMER2 vfs operations. 218 */ 219 static struct vfsops hammer2_vfsops = { 220 .vfs_init = hammer2_vfs_init, 221 .vfs_uninit = hammer2_vfs_uninit, 222 .vfs_sync = hammer2_vfs_sync, 223 .vfs_mount = hammer2_vfs_mount, 224 .vfs_unmount = hammer2_vfs_unmount, 225 .vfs_root = hammer2_vfs_root, 226 .vfs_statfs = hammer2_vfs_statfs, 227 .vfs_statvfs = hammer2_vfs_statvfs, 228 .vfs_vget = hammer2_vfs_vget, 229 .vfs_vptofh = hammer2_vfs_vptofh, 230 .vfs_fhtovp = hammer2_vfs_fhtovp, 231 .vfs_checkexp = hammer2_vfs_checkexp 232 }; 233 234 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 235 236 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE); 237 MODULE_VERSION(hammer2, 1); 238 239 static 240 int 241 hammer2_vfs_init(struct vfsconf *conf) 242 { 243 static struct objcache_malloc_args margs_read; 244 static struct objcache_malloc_args margs_write; 245 static struct objcache_malloc_args margs_vop; 246 247 int error; 248 249 error = 0; 250 251 /* 252 * A large DIO cache is needed to retain dedup enablement masks. 253 * The bulkfree code clears related masks as part of the disk block 254 * recycling algorithm, preventing it from being used for a later 255 * dedup. 256 * 257 * NOTE: A large buffer cache can actually interfere with dedup 258 * operation because we dedup based on media physical buffers 259 * and not logical buffers. Try to make the DIO chace large 260 * enough to avoid this problem, but also cap it. 261 */ 262 hammer2_limit_dio = nbuf * 2; 263 if (hammer2_limit_dio > 100000) 264 hammer2_limit_dio = 100000; 265 266 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 267 error = EINVAL; 268 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 269 error = EINVAL; 270 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 271 error = EINVAL; 272 273 if (error) 274 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 275 276 margs_read.objsize = 65536; 277 margs_read.mtype = M_HAMMER2_DEBUFFER; 278 279 margs_write.objsize = 32768; 280 margs_write.mtype = M_HAMMER2_CBUFFER; 281 282 margs_vop.objsize = sizeof(hammer2_xop_t); 283 margs_vop.mtype = M_HAMMER2; 284 285 /* 286 * Note thaht for the XOPS cache we want backing store allocations 287 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 288 * confusion), so use the backing store function that does it. This 289 * means that initial XOPS objects are zerod but REUSED objects are 290 * not. So we are responsible for cleaning the object up sufficiently 291 * for our needs before objcache_put()ing it back (typically just the 292 * FIFO indices). 293 */ 294 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 295 0, 1, NULL, NULL, NULL, 296 objcache_malloc_alloc, 297 objcache_malloc_free, 298 &margs_read); 299 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 300 0, 1, NULL, NULL, NULL, 301 objcache_malloc_alloc, 302 objcache_malloc_free, 303 &margs_write); 304 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 305 0, 1, NULL, NULL, NULL, 306 objcache_malloc_alloc_zero, 307 objcache_malloc_free, 308 &margs_vop); 309 310 311 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 312 TAILQ_INIT(&hammer2_mntlist); 313 TAILQ_INIT(&hammer2_pfslist); 314 315 hammer2_limit_dirty_chains = maxvnodes / 10; 316 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 317 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 318 319 return (error); 320 } 321 322 static 323 int 324 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 325 { 326 objcache_destroy(cache_buffer_read); 327 objcache_destroy(cache_buffer_write); 328 objcache_destroy(cache_xops); 329 return 0; 330 } 331 332 /* 333 * Core PFS allocator. Used to allocate or reference the pmp structure 334 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 335 * The pmp can be passed in or loaded by this function using the chain and 336 * inode data. 337 * 338 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 339 * transactions. Note that synchronization does not use this field. 340 * (typically frontend operations and synchronization cannot run on the 341 * same PFS node at the same time). 342 * 343 * XXX check locking 344 */ 345 hammer2_pfs_t * 346 hammer2_pfsalloc(hammer2_chain_t *chain, 347 const hammer2_inode_data_t *ripdata, 348 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 349 { 350 hammer2_pfs_t *pmp; 351 hammer2_inode_t *iroot; 352 int count; 353 int i; 354 int j; 355 356 pmp = NULL; 357 358 /* 359 * Locate or create the PFS based on the cluster id. If ripdata 360 * is NULL this is a spmp which is unique and is always allocated. 361 * 362 * If the device is mounted in local mode all PFSs are considered 363 * independent and not part of any cluster (for debugging only). 364 */ 365 if (ripdata) { 366 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 367 if (force_local != pmp->force_local) 368 continue; 369 if (force_local == NULL && 370 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 371 sizeof(pmp->pfs_clid)) == 0) { 372 break; 373 } else if (force_local && pmp->pfs_names[0] && 374 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 375 break; 376 } 377 } 378 } 379 380 if (pmp == NULL) { 381 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 382 pmp->force_local = force_local; 383 hammer2_trans_manage_init(pmp); 384 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 385 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 386 lockinit(&pmp->lock, "pfslk", 0, 0); 387 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 388 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 389 spin_init(&pmp->xop_spin, "h2xop"); 390 spin_init(&pmp->lru_spin, "h2lru"); 391 RB_INIT(&pmp->inum_tree); 392 TAILQ_INIT(&pmp->sideq); 393 TAILQ_INIT(&pmp->lru_list); 394 spin_init(&pmp->list_spin, "hm2pfsalloc_list"); 395 396 /* 397 * Distribute backend operations to threads 398 */ 399 for (i = 0; i < HAMMER2_XOPGROUPS; ++i) 400 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]); 401 402 /* 403 * Save the last media transaction id for the flusher. Set 404 * initial 405 */ 406 if (ripdata) 407 pmp->pfs_clid = ripdata->meta.pfs_clid; 408 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 409 410 /* 411 * The synchronization thread may start too early, make 412 * sure it stays frozen until we are ready to let it go. 413 * XXX 414 */ 415 /* 416 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 417 HAMMER2_THREAD_REMASTER; 418 */ 419 } 420 421 /* 422 * Create the PFS's root inode and any missing XOP helper threads. 423 */ 424 if ((iroot = pmp->iroot) == NULL) { 425 iroot = hammer2_inode_get(pmp, NULL, NULL, -1); 426 if (ripdata) 427 iroot->meta = ripdata->meta; 428 pmp->iroot = iroot; 429 hammer2_inode_ref(iroot); 430 hammer2_inode_unlock(iroot); 431 } 432 433 /* 434 * Stop here if no chain is passed in. 435 */ 436 if (chain == NULL) 437 goto done; 438 439 /* 440 * When a chain is passed in we must add it to the PFS's root 441 * inode, update pmp->pfs_types[], and update the syncronization 442 * threads. 443 * 444 * When forcing local mode, mark the PFS as a MASTER regardless. 445 * 446 * At the moment empty spots can develop due to removals or failures. 447 * Ultimately we want to re-fill these spots but doing so might 448 * confused running code. XXX 449 */ 450 hammer2_inode_ref(iroot); 451 hammer2_mtx_ex(&iroot->lock); 452 j = iroot->cluster.nchains; 453 454 kprintf("add PFS to pmp %p[%d]\n", pmp, j); 455 456 if (j == HAMMER2_MAXCLUSTER) { 457 kprintf("hammer2_mount: cluster full!\n"); 458 /* XXX fatal error? */ 459 } else { 460 KKASSERT(chain->pmp == NULL); 461 chain->pmp = pmp; 462 hammer2_chain_ref(chain); 463 iroot->cluster.array[j].chain = chain; 464 if (force_local) 465 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 466 else 467 pmp->pfs_types[j] = ripdata->meta.pfs_type; 468 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 469 pmp->pfs_hmps[j] = chain->hmp; 470 471 /* 472 * If the PFS is already mounted we must account 473 * for the mount_count here. 474 */ 475 if (pmp->mp) 476 ++chain->hmp->mount_count; 477 478 /* 479 * May have to fixup dirty chain tracking. Previous 480 * pmp was NULL so nothing to undo. 481 */ 482 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 483 hammer2_pfs_memory_inc(pmp); 484 ++j; 485 } 486 iroot->cluster.nchains = j; 487 488 /* 489 * Update nmasters from any PFS inode which is part of the cluster. 490 * It is possible that this will result in a value which is too 491 * high. MASTER PFSs are authoritative for pfs_nmasters and will 492 * override this value later on. 493 * 494 * (This informs us of masters that might not currently be 495 * discoverable by this mount). 496 */ 497 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 498 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 499 } 500 501 /* 502 * Count visible masters. Masters are usually added with 503 * ripdata->meta.pfs_nmasters set to 1. This detects when there 504 * are more (XXX and must update the master inodes). 505 */ 506 count = 0; 507 for (i = 0; i < iroot->cluster.nchains; ++i) { 508 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 509 ++count; 510 } 511 if (pmp->pfs_nmasters < count) 512 pmp->pfs_nmasters = count; 513 514 /* 515 * Create missing synchronization and support threads. 516 * 517 * Single-node masters (including snapshots) have nothing to 518 * synchronize and do not require this thread. 519 * 520 * Multi-node masters or any number of soft masters, slaves, copy, 521 * or other PFS types need the thread. 522 * 523 * Each thread is responsible for its particular cluster index. 524 * We use independent threads so stalls or mismatches related to 525 * any given target do not affect other targets. 526 */ 527 for (i = 0; i < iroot->cluster.nchains; ++i) { 528 /* 529 * Single-node masters (including snapshots) have nothing 530 * to synchronize and will make direct xops support calls, 531 * thus they do not require this thread. 532 * 533 * Note that there can be thousands of snapshots. We do not 534 * want to create thousands of threads. 535 */ 536 if (pmp->pfs_nmasters <= 1 && 537 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 538 continue; 539 } 540 541 /* 542 * Sync support thread 543 */ 544 if (pmp->sync_thrs[i].td == NULL) { 545 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL, 546 "h2nod", i, -1, 547 hammer2_primary_sync_thread); 548 } 549 } 550 551 /* 552 * Create missing Xop threads 553 * 554 * NOTE: We create helper threads for all mounted PFSs or any 555 * PFSs with 2+ nodes (so the sync thread can update them, 556 * even if not mounted). 557 */ 558 if (pmp->mp || iroot->cluster.nchains >= 2) 559 hammer2_xop_helper_create(pmp); 560 561 hammer2_mtx_unlock(&iroot->lock); 562 hammer2_inode_drop(iroot); 563 done: 564 return pmp; 565 } 566 567 /* 568 * Deallocate an element of a probed PFS. If destroying and this is a 569 * MASTER, adjust nmasters. 570 * 571 * This function does not physically destroy the PFS element in its device 572 * under the super-root (see hammer2_ioctl_pfs_delete()). 573 */ 574 void 575 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 576 { 577 hammer2_inode_t *iroot; 578 hammer2_chain_t *chain; 579 int j; 580 581 /* 582 * Cleanup our reference on iroot. iroot is (should) not be needed 583 * by the flush code. 584 */ 585 iroot = pmp->iroot; 586 if (iroot) { 587 /* 588 * Stop synchronizing 589 * 590 * XXX flush after acquiring the iroot lock. 591 * XXX clean out the cluster index from all inode structures. 592 */ 593 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 594 595 /* 596 * Remove the cluster index from the group. If destroying 597 * the PFS and this is a master, adjust pfs_nmasters. 598 */ 599 hammer2_mtx_ex(&iroot->lock); 600 chain = iroot->cluster.array[clindex].chain; 601 iroot->cluster.array[clindex].chain = NULL; 602 603 switch(pmp->pfs_types[clindex]) { 604 case HAMMER2_PFSTYPE_MASTER: 605 if (destroying && pmp->pfs_nmasters > 0) 606 --pmp->pfs_nmasters; 607 /* XXX adjust ripdata->meta.pfs_nmasters */ 608 break; 609 default: 610 break; 611 } 612 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 613 614 hammer2_mtx_unlock(&iroot->lock); 615 616 /* 617 * Release the chain. 618 */ 619 if (chain) { 620 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 621 hammer2_chain_drop(chain); 622 } 623 624 /* 625 * Terminate all XOP threads for the cluster index. 626 */ 627 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 628 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]); 629 } 630 } 631 632 /* 633 * Destroy a PFS, typically only occurs after the last mount on a device 634 * has gone away. 635 */ 636 static void 637 hammer2_pfsfree(hammer2_pfs_t *pmp) 638 { 639 hammer2_inode_t *iroot; 640 hammer2_chain_t *chain; 641 int i; 642 int j; 643 644 /* 645 * Cleanup our reference on iroot. iroot is (should) not be needed 646 * by the flush code. 647 */ 648 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 649 650 iroot = pmp->iroot; 651 if (iroot) { 652 for (i = 0; i < iroot->cluster.nchains; ++i) { 653 hammer2_thr_delete(&pmp->sync_thrs[i]); 654 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 655 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 656 } 657 #if REPORT_REFS_ERRORS 658 if (pmp->iroot->refs != 1) 659 kprintf("PMP->IROOT %p REFS WRONG %d\n", 660 pmp->iroot, pmp->iroot->refs); 661 #else 662 KKASSERT(pmp->iroot->refs == 1); 663 #endif 664 /* ref for pmp->iroot */ 665 hammer2_inode_drop(pmp->iroot); 666 pmp->iroot = NULL; 667 } 668 669 /* 670 * Cleanup chains remaining on LRU list. 671 */ 672 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count); 673 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 674 hammer2_chain_ref(chain); 675 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 676 hammer2_chain_drop(chain); 677 } 678 679 /* 680 * Free remaining pmp resources 681 */ 682 kmalloc_destroy(&pmp->mmsg); 683 kmalloc_destroy(&pmp->minode); 684 685 kfree(pmp, M_HAMMER2); 686 } 687 688 /* 689 * Remove all references to hmp from the pfs list. Any PFS which becomes 690 * empty is terminated and freed. 691 * 692 * XXX inefficient. 693 */ 694 static void 695 hammer2_pfsfree_scan(hammer2_dev_t *hmp) 696 { 697 hammer2_pfs_t *pmp; 698 hammer2_inode_t *iroot; 699 hammer2_chain_t *rchain; 700 int didfreeze; 701 int i; 702 int j; 703 704 again: 705 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 706 if ((iroot = pmp->iroot) == NULL) 707 continue; 708 if (hmp->spmp == pmp) { 709 kprintf("unmount hmp %p remove spmp %p\n", 710 hmp, pmp); 711 hmp->spmp = NULL; 712 } 713 714 /* 715 * Determine if this PFS is affected. If it is we must 716 * freeze all management threads and lock its iroot. 717 * 718 * Freezing a management thread forces it idle, operations 719 * in-progress will be aborted and it will have to start 720 * over again when unfrozen, or exit if told to exit. 721 */ 722 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 723 if (pmp->pfs_hmps[i] == hmp) 724 break; 725 } 726 if (i != HAMMER2_MAXCLUSTER) { 727 /* 728 * Make sure all synchronization threads are locked 729 * down. 730 */ 731 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 732 if (pmp->pfs_hmps[i] == NULL) 733 continue; 734 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 735 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 736 hammer2_thr_freeze_async( 737 &pmp->xop_groups[j].thrs[i]); 738 } 739 } 740 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 741 if (pmp->pfs_hmps[i] == NULL) 742 continue; 743 hammer2_thr_freeze(&pmp->sync_thrs[i]); 744 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 745 hammer2_thr_freeze( 746 &pmp->xop_groups[j].thrs[i]); 747 } 748 } 749 750 /* 751 * Lock the inode and clean out matching chains. 752 * Note that we cannot use hammer2_inode_lock_*() 753 * here because that would attempt to validate the 754 * cluster that we are in the middle of ripping 755 * apart. 756 * 757 * WARNING! We are working directly on the inodes 758 * embedded cluster. 759 */ 760 hammer2_mtx_ex(&iroot->lock); 761 762 /* 763 * Remove the chain from matching elements of the PFS. 764 */ 765 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 766 if (pmp->pfs_hmps[i] != hmp) 767 continue; 768 hammer2_thr_delete(&pmp->sync_thrs[i]); 769 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 770 hammer2_thr_delete( 771 &pmp->xop_groups[j].thrs[i]); 772 } 773 rchain = iroot->cluster.array[i].chain; 774 iroot->cluster.array[i].chain = NULL; 775 pmp->pfs_types[i] = 0; 776 if (pmp->pfs_names[i]) { 777 kfree(pmp->pfs_names[i], M_HAMMER2); 778 pmp->pfs_names[i] = NULL; 779 } 780 if (rchain) { 781 hammer2_chain_drop(rchain); 782 /* focus hint */ 783 if (iroot->cluster.focus == rchain) 784 iroot->cluster.focus = NULL; 785 } 786 pmp->pfs_hmps[i] = NULL; 787 } 788 hammer2_mtx_unlock(&iroot->lock); 789 didfreeze = 1; /* remaster, unfreeze down below */ 790 } else { 791 didfreeze = 0; 792 } 793 794 /* 795 * Cleanup trailing chains. Gaps may remain. 796 */ 797 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 798 if (pmp->pfs_hmps[i]) 799 break; 800 } 801 iroot->cluster.nchains = i + 1; 802 803 /* 804 * If the PMP has no elements remaining we can destroy it. 805 * (this will transition management threads from frozen->exit). 806 */ 807 if (iroot->cluster.nchains == 0) { 808 kprintf("unmount hmp %p last ref to PMP=%p\n", 809 hmp, pmp); 810 hammer2_pfsfree(pmp); 811 goto again; 812 } 813 814 /* 815 * If elements still remain we need to set the REMASTER 816 * flag and unfreeze it. 817 */ 818 if (didfreeze) { 819 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 820 if (pmp->pfs_hmps[i] == NULL) 821 continue; 822 hammer2_thr_remaster(&pmp->sync_thrs[i]); 823 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 824 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 825 hammer2_thr_remaster( 826 &pmp->xop_groups[j].thrs[i]); 827 hammer2_thr_unfreeze( 828 &pmp->xop_groups[j].thrs[i]); 829 } 830 } 831 } 832 } 833 } 834 835 /* 836 * Mount or remount HAMMER2 fileystem from physical media 837 * 838 * mountroot 839 * mp mount point structure 840 * path NULL 841 * data <unused> 842 * cred <unused> 843 * 844 * mount 845 * mp mount point structure 846 * path path to mount point 847 * data pointer to argument structure in user space 848 * volume volume path (device@LABEL form) 849 * hflags user mount flags 850 * cred user credentials 851 * 852 * RETURNS: 0 Success 853 * !0 error number 854 */ 855 static 856 int 857 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 858 struct ucred *cred) 859 { 860 struct hammer2_mount_info info; 861 hammer2_pfs_t *pmp; 862 hammer2_pfs_t *spmp; 863 hammer2_dev_t *hmp; 864 hammer2_dev_t *force_local; 865 hammer2_key_t key_next; 866 hammer2_key_t key_dummy; 867 hammer2_key_t lhc; 868 struct vnode *devvp; 869 struct nlookupdata nd; 870 hammer2_chain_t *parent; 871 hammer2_chain_t *chain; 872 hammer2_cluster_t *cluster; 873 const hammer2_inode_data_t *ripdata; 874 hammer2_blockref_t bref; 875 struct file *fp; 876 char devstr[MNAMELEN]; 877 size_t size; 878 size_t done; 879 char *dev; 880 char *label; 881 int ronly = 1; 882 int error; 883 int i; 884 885 hmp = NULL; 886 pmp = NULL; 887 dev = NULL; 888 label = NULL; 889 devvp = NULL; 890 891 kprintf("hammer2_mount\n"); 892 893 if (path == NULL) { 894 /* 895 * Root mount 896 */ 897 bzero(&info, sizeof(info)); 898 info.cluster_fd = -1; 899 ksnprintf(devstr, sizeof(devstr), "%s", 900 mp->mnt_stat.f_mntfromname); 901 kprintf("hammer2_mount: root '%s'\n", devstr); 902 } else { 903 /* 904 * Non-root mount or updating a mount 905 */ 906 error = copyin(data, &info, sizeof(info)); 907 if (error) 908 return (error); 909 910 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 911 if (error) 912 return (error); 913 } 914 915 /* 916 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA 917 * if no label specified, based on the partition id. Error out if no 918 * partition id. This is strictly a convenience to match the 919 * default label created by newfs_hammer2, our preference is 920 * that a label always be specified. 921 */ 922 dev = devstr; 923 label = strchr(devstr, '@'); 924 if (label && ((label + 1) - dev) > done) 925 return (EINVAL); 926 if (label && label == devstr) 927 return (EINVAL); 928 if (label == NULL || label[1] == 0) { 929 char slice; 930 931 if (label == NULL) 932 label = devstr + strlen(devstr); 933 slice = label[-1]; 934 switch(slice) { 935 case 'a': 936 label = "BOOT"; 937 break; 938 case 'd': 939 label = "ROOT"; 940 break; 941 default: 942 label = "DATA"; 943 break; 944 } 945 } else { 946 *label = '\0'; 947 label++; 948 } 949 950 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n", 951 dev, label, (mp->mnt_flag & MNT_RDONLY)); 952 953 if (mp->mnt_flag & MNT_UPDATE) { 954 /* 955 * Update mount. Note that pmp->iroot->cluster is 956 * an inode-embedded cluster and thus cannot be 957 * directly locked. 958 * 959 * XXX HAMMER2 needs to implement NFS export via 960 * mountctl. 961 */ 962 pmp = MPTOPMP(mp); 963 pmp->hflags = info.hflags; 964 cluster = &pmp->iroot->cluster; 965 for (i = 0; i < cluster->nchains; ++i) { 966 if (cluster->array[i].chain == NULL) 967 continue; 968 hmp = cluster->array[i].chain->hmp; 969 devvp = hmp->devvp; 970 error = hammer2_remount(hmp, mp, path, 971 devvp, cred); 972 if (error) 973 break; 974 } 975 976 return error; 977 } 978 979 /* 980 * HMP device mount 981 * 982 * If a path is specified and dev is not an empty string, lookup the 983 * name and verify that it referes to a block device. 984 * 985 * If a path is specified and dev is an empty string we fall through 986 * and locate the label in the hmp search. 987 */ 988 if (path && *dev != 0) { 989 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 990 if (error == 0) 991 error = nlookup(&nd); 992 if (error == 0) 993 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 994 nlookup_done(&nd); 995 } else if (path == NULL) { 996 /* root mount */ 997 cdev_t cdev = kgetdiskbyname(dev); 998 error = bdevvp(cdev, &devvp); 999 if (error) 1000 kprintf("hammer2: cannot find '%s'\n", dev); 1001 } else { 1002 /* 1003 * We will locate the hmp using the label in the hmp loop. 1004 */ 1005 error = 0; 1006 } 1007 1008 /* 1009 * Make sure its a block device. Do not check to see if it is 1010 * already mounted until we determine that its a fresh H2 device. 1011 */ 1012 if (error == 0 && devvp) { 1013 vn_isdisk(devvp, &error); 1014 } 1015 1016 /* 1017 * Determine if the device has already been mounted. After this 1018 * check hmp will be non-NULL if we are doing the second or more 1019 * hammer2 mounts from the same device. 1020 */ 1021 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1022 if (devvp) { 1023 /* 1024 * Match the device. Due to the way devfs works, 1025 * we may not be able to directly match the vnode pointer, 1026 * so also check to see if the underlying device matches. 1027 */ 1028 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1029 if (hmp->devvp == devvp) 1030 break; 1031 if (devvp->v_rdev && 1032 hmp->devvp->v_rdev == devvp->v_rdev) { 1033 break; 1034 } 1035 } 1036 1037 /* 1038 * If no match this may be a fresh H2 mount, make sure 1039 * the device is not mounted on anything else. 1040 */ 1041 if (hmp == NULL) 1042 error = vfs_mountedon(devvp); 1043 } else if (error == 0) { 1044 /* 1045 * Match the label to a pmp already probed. 1046 */ 1047 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 1048 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 1049 if (pmp->pfs_names[i] && 1050 strcmp(pmp->pfs_names[i], label) == 0) { 1051 hmp = pmp->pfs_hmps[i]; 1052 break; 1053 } 1054 } 1055 if (hmp) 1056 break; 1057 } 1058 if (hmp == NULL) 1059 error = ENOENT; 1060 } 1061 1062 /* 1063 * Open the device if this isn't a secondary mount and construct 1064 * the H2 device mount (hmp). 1065 */ 1066 if (hmp == NULL) { 1067 hammer2_chain_t *schain; 1068 hammer2_xid_t xid; 1069 1070 if (error == 0 && vcount(devvp) > 0) { 1071 kprintf("Primary device already has references\n"); 1072 error = EBUSY; 1073 } 1074 1075 /* 1076 * Now open the device 1077 */ 1078 if (error == 0) { 1079 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1080 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1081 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1082 if (error == 0) { 1083 error = VOP_OPEN(devvp, 1084 (ronly ? FREAD : FREAD | FWRITE), 1085 FSCRED, NULL); 1086 } 1087 vn_unlock(devvp); 1088 } 1089 if (error && devvp) { 1090 vrele(devvp); 1091 devvp = NULL; 1092 } 1093 if (error) { 1094 lockmgr(&hammer2_mntlk, LK_RELEASE); 1095 return error; 1096 } 1097 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1098 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1099 hmp->ronly = ronly; 1100 hmp->devvp = devvp; 1101 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1102 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1103 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1104 RB_INIT(&hmp->iotree); 1105 spin_init(&hmp->io_spin, "hm2mount_io"); 1106 spin_init(&hmp->list_spin, "hm2mount_list"); 1107 TAILQ_INIT(&hmp->flushq); 1108 1109 lockinit(&hmp->vollk, "h2vol", 0, 0); 1110 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1111 lockinit(&hmp->bflock, "h2bflk", 0, 0); 1112 1113 /* 1114 * vchain setup. vchain.data is embedded. 1115 * vchain.refs is initialized and will never drop to 0. 1116 * 1117 * NOTE! voldata is not yet loaded. 1118 */ 1119 hmp->vchain.hmp = hmp; 1120 hmp->vchain.refs = 1; 1121 hmp->vchain.data = (void *)&hmp->voldata; 1122 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1123 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1124 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1125 1126 hammer2_chain_core_init(&hmp->vchain); 1127 /* hmp->vchain.u.xxx is left NULL */ 1128 1129 /* 1130 * fchain setup. fchain.data is embedded. 1131 * fchain.refs is initialized and will never drop to 0. 1132 * 1133 * The data is not used but needs to be initialized to 1134 * pass assertion muster. We use this chain primarily 1135 * as a placeholder for the freemap's top-level RBTREE 1136 * so it does not interfere with the volume's topology 1137 * RBTREE. 1138 */ 1139 hmp->fchain.hmp = hmp; 1140 hmp->fchain.refs = 1; 1141 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1142 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1143 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1144 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1145 hmp->fchain.bref.methods = 1146 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1147 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1148 1149 hammer2_chain_core_init(&hmp->fchain); 1150 /* hmp->fchain.u.xxx is left NULL */ 1151 1152 /* 1153 * Install the volume header and initialize fields from 1154 * voldata. 1155 */ 1156 error = hammer2_install_volume_header(hmp); 1157 if (error) { 1158 hammer2_unmount_helper(mp, NULL, hmp); 1159 lockmgr(&hammer2_mntlk, LK_RELEASE); 1160 hammer2_vfs_unmount(mp, MNT_FORCE); 1161 return error; 1162 } 1163 1164 /* 1165 * Really important to get these right or flush will get 1166 * confused. 1167 */ 1168 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1169 kprintf("alloc spmp %p tid %016jx\n", 1170 hmp->spmp, hmp->voldata.mirror_tid); 1171 spmp = hmp->spmp; 1172 1173 /* 1174 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1175 * is inherited from the volume header. 1176 */ 1177 xid = 0; 1178 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1179 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1180 hmp->vchain.pmp = spmp; 1181 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1182 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1183 hmp->fchain.pmp = spmp; 1184 1185 /* 1186 * First locate the super-root inode, which is key 0 1187 * relative to the volume header's blockset. 1188 * 1189 * Then locate the root inode by scanning the directory keyspace 1190 * represented by the label. 1191 */ 1192 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1193 schain = hammer2_chain_lookup(&parent, &key_dummy, 1194 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1195 &error, 0); 1196 hammer2_chain_lookup_done(parent); 1197 if (schain == NULL) { 1198 kprintf("hammer2_mount: invalid super-root\n"); 1199 hammer2_unmount_helper(mp, NULL, hmp); 1200 lockmgr(&hammer2_mntlk, LK_RELEASE); 1201 hammer2_vfs_unmount(mp, MNT_FORCE); 1202 return EINVAL; 1203 } 1204 if (schain->error) { 1205 kprintf("hammer2_mount: error %s reading super-root\n", 1206 hammer2_error_str(schain->error)); 1207 hammer2_chain_unlock(schain); 1208 hammer2_chain_drop(schain); 1209 schain = NULL; 1210 hammer2_unmount_helper(mp, NULL, hmp); 1211 lockmgr(&hammer2_mntlk, LK_RELEASE); 1212 hammer2_vfs_unmount(mp, MNT_FORCE); 1213 return EINVAL; 1214 } 1215 1216 /* 1217 * The super-root always uses an inode_tid of 1 when 1218 * creating PFSs. 1219 */ 1220 spmp->inode_tid = 1; 1221 spmp->modify_tid = schain->bref.modify_tid + 1; 1222 1223 /* 1224 * Sanity-check schain's pmp and finish initialization. 1225 * Any chain belonging to the super-root topology should 1226 * have a NULL pmp (not even set to spmp). 1227 */ 1228 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1229 KKASSERT(schain->pmp == NULL); 1230 spmp->pfs_clid = ripdata->meta.pfs_clid; 1231 1232 /* 1233 * Replace the dummy spmp->iroot with a real one. It's 1234 * easier to just do a wholesale replacement than to try 1235 * to update the chain and fixup the iroot fields. 1236 * 1237 * The returned inode is locked with the supplied cluster. 1238 */ 1239 cluster = hammer2_cluster_from_chain(schain); 1240 hammer2_inode_drop(spmp->iroot); 1241 spmp->iroot = NULL; 1242 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1243 spmp->spmp_hmp = hmp; 1244 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1245 spmp->pfs_hmps[0] = hmp; 1246 hammer2_inode_ref(spmp->iroot); 1247 hammer2_inode_unlock(spmp->iroot); 1248 hammer2_cluster_unlock(cluster); 1249 hammer2_cluster_drop(cluster); 1250 schain = NULL; 1251 /* leave spmp->iroot with one ref */ 1252 1253 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1254 error = hammer2_recovery(hmp); 1255 /* XXX do something with error */ 1256 } 1257 hammer2_update_pmps(hmp); 1258 hammer2_iocom_init(hmp); 1259 hammer2_bulkfree_init(hmp); 1260 1261 /* 1262 * Ref the cluster management messaging descriptor. The mount 1263 * program deals with the other end of the communications pipe. 1264 * 1265 * Root mounts typically do not supply one. 1266 */ 1267 if (info.cluster_fd >= 0) { 1268 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1269 if (fp) { 1270 hammer2_cluster_reconnect(hmp, fp); 1271 } else { 1272 kprintf("hammer2_mount: bad cluster_fd!\n"); 1273 } 1274 } 1275 } else { 1276 spmp = hmp->spmp; 1277 if (info.hflags & HMNT2_DEVFLAGS) { 1278 kprintf("hammer2: Warning: mount flags pertaining " 1279 "to the whole device may only be specified " 1280 "on the first mount of the device: %08x\n", 1281 info.hflags & HMNT2_DEVFLAGS); 1282 } 1283 } 1284 1285 /* 1286 * Force local mount (disassociate all PFSs from their clusters). 1287 * Used primarily for debugging. 1288 */ 1289 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1290 1291 /* 1292 * Lookup the mount point under the media-localized super-root. 1293 * Scanning hammer2_pfslist doesn't help us because it represents 1294 * PFS cluster ids which can aggregate several named PFSs together. 1295 * 1296 * cluster->pmp will incorrectly point to spmp and must be fixed 1297 * up later on. 1298 */ 1299 hammer2_inode_lock(spmp->iroot, 0); 1300 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1301 lhc = hammer2_dirhash(label, strlen(label)); 1302 chain = hammer2_chain_lookup(&parent, &key_next, 1303 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1304 &error, 0); 1305 while (chain) { 1306 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1307 strcmp(label, chain->data->ipdata.filename) == 0) { 1308 break; 1309 } 1310 chain = hammer2_chain_next(&parent, chain, &key_next, 1311 key_next, 1312 lhc + HAMMER2_DIRHASH_LOMASK, 1313 &error, 0); 1314 } 1315 if (parent) { 1316 hammer2_chain_unlock(parent); 1317 hammer2_chain_drop(parent); 1318 } 1319 hammer2_inode_unlock(spmp->iroot); 1320 1321 /* 1322 * PFS could not be found? 1323 */ 1324 if (chain == NULL) { 1325 if (error) 1326 kprintf("hammer2_mount: PFS label I/O error\n"); 1327 else 1328 kprintf("hammer2_mount: PFS label not found\n"); 1329 hammer2_unmount_helper(mp, NULL, hmp); 1330 lockmgr(&hammer2_mntlk, LK_RELEASE); 1331 hammer2_vfs_unmount(mp, MNT_FORCE); 1332 1333 return EINVAL; 1334 } 1335 1336 /* 1337 * Acquire the pmp structure (it should have already been allocated 1338 * via hammer2_update_pmps() so do not pass cluster in to add to 1339 * available chains). 1340 * 1341 * Check if the cluster has already been mounted. A cluster can 1342 * only be mounted once, use null mounts to mount additional copies. 1343 */ 1344 if (chain->error) { 1345 kprintf("hammer2_mount: PFS label I/O error\n"); 1346 } else { 1347 ripdata = &chain->data->ipdata; 1348 bref = chain->bref; 1349 pmp = hammer2_pfsalloc(NULL, ripdata, 1350 bref.modify_tid, force_local); 1351 } 1352 hammer2_chain_unlock(chain); 1353 hammer2_chain_drop(chain); 1354 1355 /* 1356 * Finish the mount 1357 */ 1358 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1359 1360 if (pmp->mp) { 1361 kprintf("hammer2_mount: PFS already mounted!\n"); 1362 hammer2_unmount_helper(mp, NULL, hmp); 1363 lockmgr(&hammer2_mntlk, LK_RELEASE); 1364 hammer2_vfs_unmount(mp, MNT_FORCE); 1365 1366 return EBUSY; 1367 } 1368 1369 pmp->hflags = info.hflags; 1370 mp->mnt_flag |= MNT_LOCAL; 1371 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1372 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1373 1374 /* 1375 * required mount structure initializations 1376 */ 1377 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1378 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1379 1380 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1381 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1382 1383 /* 1384 * Optional fields 1385 */ 1386 mp->mnt_iosize_max = MAXPHYS; 1387 1388 /* 1389 * Connect up mount pointers. 1390 */ 1391 hammer2_mount_helper(mp, pmp); 1392 1393 lockmgr(&hammer2_mntlk, LK_RELEASE); 1394 1395 /* 1396 * Finish setup 1397 */ 1398 vfs_getnewfsid(mp); 1399 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1400 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1401 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1402 1403 if (path) { 1404 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1405 MNAMELEN - 1, &size); 1406 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1407 } /* else root mount, already in there */ 1408 1409 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1410 if (path) { 1411 copyinstr(path, mp->mnt_stat.f_mntonname, 1412 sizeof(mp->mnt_stat.f_mntonname) - 1, 1413 &size); 1414 } else { 1415 /* root mount */ 1416 mp->mnt_stat.f_mntonname[0] = '/'; 1417 } 1418 1419 /* 1420 * Initial statfs to prime mnt_stat. 1421 */ 1422 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1423 1424 return 0; 1425 } 1426 1427 /* 1428 * Scan PFSs under the super-root and create hammer2_pfs structures. 1429 */ 1430 static 1431 void 1432 hammer2_update_pmps(hammer2_dev_t *hmp) 1433 { 1434 const hammer2_inode_data_t *ripdata; 1435 hammer2_chain_t *parent; 1436 hammer2_chain_t *chain; 1437 hammer2_blockref_t bref; 1438 hammer2_dev_t *force_local; 1439 hammer2_pfs_t *spmp; 1440 hammer2_pfs_t *pmp; 1441 hammer2_key_t key_next; 1442 int error; 1443 1444 /* 1445 * Force local mount (disassociate all PFSs from their clusters). 1446 * Used primarily for debugging. 1447 */ 1448 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1449 1450 /* 1451 * Lookup mount point under the media-localized super-root. 1452 * 1453 * cluster->pmp will incorrectly point to spmp and must be fixed 1454 * up later on. 1455 */ 1456 spmp = hmp->spmp; 1457 hammer2_inode_lock(spmp->iroot, 0); 1458 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1459 chain = hammer2_chain_lookup(&parent, &key_next, 1460 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1461 &error, 0); 1462 while (chain) { 1463 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1464 continue; 1465 if (chain->error) { 1466 kprintf("I/O error scanning PFS labels\n"); 1467 } else { 1468 ripdata = &chain->data->ipdata; 1469 bref = chain->bref; 1470 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename); 1471 1472 pmp = hammer2_pfsalloc(chain, ripdata, 1473 bref.modify_tid, force_local); 1474 } 1475 chain = hammer2_chain_next(&parent, chain, &key_next, 1476 key_next, HAMMER2_KEY_MAX, 1477 &error, 0); 1478 } 1479 if (parent) { 1480 hammer2_chain_unlock(parent); 1481 hammer2_chain_drop(parent); 1482 } 1483 hammer2_inode_unlock(spmp->iroot); 1484 } 1485 1486 static 1487 int 1488 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1489 struct vnode *devvp, struct ucred *cred) 1490 { 1491 int error; 1492 1493 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1494 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1495 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL); 1496 vn_unlock(devvp); 1497 error = hammer2_recovery(hmp); 1498 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1499 if (error == 0) { 1500 VOP_CLOSE(devvp, FREAD, NULL); 1501 hmp->ronly = 0; 1502 } else { 1503 VOP_CLOSE(devvp, FREAD | FWRITE, NULL); 1504 } 1505 vn_unlock(devvp); 1506 } else { 1507 error = 0; 1508 } 1509 return error; 1510 } 1511 1512 static 1513 int 1514 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1515 { 1516 hammer2_pfs_t *pmp; 1517 int flags; 1518 int error = 0; 1519 1520 pmp = MPTOPMP(mp); 1521 1522 if (pmp == NULL) 1523 return(0); 1524 1525 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1526 1527 /* 1528 * If mount initialization proceeded far enough we must flush 1529 * its vnodes and sync the underlying mount points. Three syncs 1530 * are required to fully flush the filesystem (freemap updates lag 1531 * by one flush, and one extra for safety). 1532 */ 1533 if (mntflags & MNT_FORCE) 1534 flags = FORCECLOSE; 1535 else 1536 flags = 0; 1537 if (pmp->iroot) { 1538 error = vflush(mp, 0, flags); 1539 if (error) 1540 goto failed; 1541 hammer2_vfs_sync(mp, MNT_WAIT); 1542 hammer2_vfs_sync(mp, MNT_WAIT); 1543 hammer2_vfs_sync(mp, MNT_WAIT); 1544 } 1545 1546 /* 1547 * Cleanup the frontend support XOPS threads 1548 */ 1549 hammer2_xop_helper_cleanup(pmp); 1550 1551 if (pmp->mp) 1552 hammer2_unmount_helper(mp, pmp, NULL); 1553 1554 error = 0; 1555 failed: 1556 lockmgr(&hammer2_mntlk, LK_RELEASE); 1557 1558 return (error); 1559 } 1560 1561 /* 1562 * Mount helper, hook the system mount into our PFS. 1563 * The mount lock is held. 1564 * 1565 * We must bump the mount_count on related devices for any 1566 * mounted PFSs. 1567 */ 1568 static 1569 void 1570 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1571 { 1572 hammer2_cluster_t *cluster; 1573 hammer2_chain_t *rchain; 1574 int i; 1575 1576 mp->mnt_data = (qaddr_t)pmp; 1577 pmp->mp = mp; 1578 1579 /* 1580 * After pmp->mp is set we have to adjust hmp->mount_count. 1581 */ 1582 cluster = &pmp->iroot->cluster; 1583 for (i = 0; i < cluster->nchains; ++i) { 1584 rchain = cluster->array[i].chain; 1585 if (rchain == NULL) 1586 continue; 1587 ++rchain->hmp->mount_count; 1588 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1589 rchain->hmp, rchain->hmp->mount_count); 1590 } 1591 1592 /* 1593 * Create missing Xop threads 1594 */ 1595 hammer2_xop_helper_create(pmp); 1596 } 1597 1598 /* 1599 * Mount helper, unhook the system mount from our PFS. 1600 * The mount lock is held. 1601 * 1602 * If hmp is supplied a mount responsible for being the first to open 1603 * the block device failed and the block device and all PFSs using the 1604 * block device must be cleaned up. 1605 * 1606 * If pmp is supplied multiple devices might be backing the PFS and each 1607 * must be disconnected. This might not be the last PFS using some of the 1608 * underlying devices. Also, we have to adjust our hmp->mount_count 1609 * accounting for the devices backing the pmp which is now undergoing an 1610 * unmount. 1611 */ 1612 static 1613 void 1614 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1615 { 1616 hammer2_cluster_t *cluster; 1617 hammer2_chain_t *rchain; 1618 struct vnode *devvp; 1619 int dumpcnt; 1620 int ronly; 1621 int i; 1622 1623 /* 1624 * If no device supplied this is a high-level unmount and we have to 1625 * to disconnect the mount, adjust mount_count, and locate devices 1626 * that might now have no mounts. 1627 */ 1628 if (pmp) { 1629 KKASSERT(hmp == NULL); 1630 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1631 pmp->mp = NULL; 1632 mp->mnt_data = NULL; 1633 1634 /* 1635 * After pmp->mp is cleared we have to account for 1636 * mount_count. 1637 */ 1638 cluster = &pmp->iroot->cluster; 1639 for (i = 0; i < cluster->nchains; ++i) { 1640 rchain = cluster->array[i].chain; 1641 if (rchain == NULL) 1642 continue; 1643 --rchain->hmp->mount_count; 1644 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n", 1645 rchain->hmp, rchain->hmp->mount_count); 1646 /* scrapping hmp now may invalidate the pmp */ 1647 } 1648 again: 1649 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1650 if (hmp->mount_count == 0) { 1651 hammer2_unmount_helper(NULL, NULL, hmp); 1652 goto again; 1653 } 1654 } 1655 return; 1656 } 1657 1658 /* 1659 * Try to terminate the block device. We can't terminate it if 1660 * there are still PFSs referencing it. 1661 */ 1662 kprintf("hammer2_unmount hmp=%p mount_count=%d\n", 1663 hmp, hmp->mount_count); 1664 if (hmp->mount_count) 1665 return; 1666 1667 hammer2_bulkfree_uninit(hmp); 1668 hammer2_pfsfree_scan(hmp); 1669 hammer2_dev_exlock(hmp); /* XXX order */ 1670 1671 /* 1672 * Cycle the volume data lock as a safety (probably not needed any 1673 * more). To ensure everything is out we need to flush at least 1674 * three times. (1) The running of the sideq can dirty the 1675 * filesystem, (2) A normal flush can dirty the freemap, and 1676 * (3) ensure that the freemap is fully synchronized. 1677 * 1678 * The next mount's recovery scan can clean everything up but we want 1679 * to leave the filesystem in a 100% clean state on a normal unmount. 1680 */ 1681 #if 0 1682 hammer2_voldata_lock(hmp); 1683 hammer2_voldata_unlock(hmp); 1684 #endif 1685 hammer2_iocom_uninit(hmp); 1686 1687 if ((hmp->vchain.flags | hmp->fchain.flags) & 1688 HAMMER2_CHAIN_FLUSH_MASK) { 1689 kprintf("hammer2_unmount: chains left over " 1690 "after final sync\n"); 1691 kprintf(" vchain %08x\n", hmp->vchain.flags); 1692 kprintf(" fchain %08x\n", hmp->fchain.flags); 1693 1694 if (hammer2_debug & 0x0010) 1695 Debugger("entered debugger"); 1696 } 1697 1698 KKASSERT(hmp->spmp == NULL); 1699 1700 /* 1701 * Finish up with the device vnode 1702 */ 1703 if ((devvp = hmp->devvp) != NULL) { 1704 ronly = hmp->ronly; 1705 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1706 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n", 1707 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree), 1708 ronly); 1709 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1710 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n", 1711 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree)); 1712 hmp->devvp = NULL; 1713 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1714 vn_unlock(devvp); 1715 vrele(devvp); 1716 devvp = NULL; 1717 } 1718 1719 /* 1720 * Clear vchain/fchain flags that might prevent final cleanup 1721 * of these chains. 1722 */ 1723 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1724 atomic_add_long(&hammer2_count_modified_chains, -1); 1725 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1726 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1727 } 1728 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1729 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1730 } 1731 1732 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1733 atomic_add_long(&hammer2_count_modified_chains, -1); 1734 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1735 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1736 } 1737 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1738 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1739 } 1740 1741 /* 1742 * Final drop of embedded freemap root chain to 1743 * clean up fchain.core (fchain structure is not 1744 * flagged ALLOCATED so it is cleaned out and then 1745 * left to rot). 1746 */ 1747 hammer2_chain_drop(&hmp->fchain); 1748 1749 /* 1750 * Final drop of embedded volume root chain to clean 1751 * up vchain.core (vchain structure is not flagged 1752 * ALLOCATED so it is cleaned out and then left to 1753 * rot). 1754 */ 1755 dumpcnt = 50; 1756 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1757 dumpcnt = 50; 1758 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1759 hammer2_dev_unlock(hmp); 1760 hammer2_chain_drop(&hmp->vchain); 1761 1762 hammer2_io_cleanup(hmp, &hmp->iotree); 1763 if (hmp->iofree_count) { 1764 kprintf("io_cleanup: %d I/O's left hanging\n", 1765 hmp->iofree_count); 1766 } 1767 1768 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1769 kmalloc_destroy(&hmp->mchain); 1770 kfree(hmp, M_HAMMER2); 1771 } 1772 1773 int 1774 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1775 ino_t ino, struct vnode **vpp) 1776 { 1777 hammer2_xop_lookup_t *xop; 1778 hammer2_pfs_t *pmp; 1779 hammer2_inode_t *ip; 1780 hammer2_tid_t inum; 1781 int error; 1782 1783 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1784 1785 error = 0; 1786 pmp = MPTOPMP(mp); 1787 1788 /* 1789 * Easy if we already have it cached 1790 */ 1791 ip = hammer2_inode_lookup(pmp, inum); 1792 if (ip) { 1793 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1794 *vpp = hammer2_igetv(ip, &error); 1795 hammer2_inode_unlock(ip); 1796 hammer2_inode_drop(ip); /* from lookup */ 1797 1798 return error; 1799 } 1800 1801 /* 1802 * Otherwise we have to find the inode 1803 */ 1804 xop = hammer2_xop_alloc(pmp->iroot, 0); 1805 xop->lhc = inum; 1806 hammer2_xop_start(&xop->head, hammer2_xop_lookup); 1807 error = hammer2_xop_collect(&xop->head, 0); 1808 1809 if (error == 0) { 1810 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) { 1811 kprintf("vget: no collect error but also no rdata\n"); 1812 kprintf("xop %p\n", xop); 1813 while ((hammer2_debug & 0x80000) == 0) { 1814 tsleep(xop, PCATCH, "wait", hz * 10); 1815 } 1816 ip = NULL; 1817 } else { 1818 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1); 1819 } 1820 } 1821 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1822 1823 if (ip) { 1824 *vpp = hammer2_igetv(ip, &error); 1825 hammer2_inode_unlock(ip); 1826 } else { 1827 *vpp = NULL; 1828 error = ENOENT; 1829 } 1830 return (error); 1831 } 1832 1833 static 1834 int 1835 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1836 { 1837 hammer2_pfs_t *pmp; 1838 struct vnode *vp; 1839 int error; 1840 1841 pmp = MPTOPMP(mp); 1842 if (pmp->iroot == NULL) { 1843 *vpp = NULL; 1844 return EINVAL; 1845 } 1846 1847 error = 0; 1848 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1849 1850 while (pmp->inode_tid == 0) { 1851 hammer2_xop_ipcluster_t *xop; 1852 hammer2_inode_meta_t *meta; 1853 1854 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1855 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1856 error = hammer2_xop_collect(&xop->head, 0); 1857 1858 if (error == 0) { 1859 meta = &xop->head.cluster.focus->data->ipdata.meta; 1860 pmp->iroot->meta = *meta; 1861 pmp->inode_tid = meta->pfs_inum + 1; 1862 if (pmp->inode_tid < HAMMER2_INODE_START) 1863 pmp->inode_tid = HAMMER2_INODE_START; 1864 pmp->modify_tid = 1865 xop->head.cluster.focus->bref.modify_tid + 1; 1866 kprintf("PFS: Starting inode %jd\n", 1867 (intmax_t)pmp->inode_tid); 1868 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1869 pmp->inode_tid, pmp->modify_tid); 1870 wakeup(&pmp->iroot); 1871 1872 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1873 1874 /* 1875 * Prime the mount info. 1876 */ 1877 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1878 break; 1879 } 1880 1881 /* 1882 * Loop, try again 1883 */ 1884 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1885 hammer2_inode_unlock(pmp->iroot); 1886 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1887 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1888 if (error == EINTR) 1889 break; 1890 } 1891 1892 if (error) { 1893 hammer2_inode_unlock(pmp->iroot); 1894 *vpp = NULL; 1895 } else { 1896 vp = hammer2_igetv(pmp->iroot, &error); 1897 hammer2_inode_unlock(pmp->iroot); 1898 *vpp = vp; 1899 } 1900 1901 return (error); 1902 } 1903 1904 /* 1905 * Filesystem status 1906 * 1907 * XXX incorporate ipdata->meta.inode_quota and data_quota 1908 */ 1909 static 1910 int 1911 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1912 { 1913 hammer2_pfs_t *pmp; 1914 hammer2_dev_t *hmp; 1915 hammer2_blockref_t bref; 1916 int i; 1917 1918 /* 1919 * NOTE: iroot might not have validated the cluster yet. 1920 */ 1921 pmp = MPTOPMP(mp); 1922 1923 mp->mnt_stat.f_files = 0; 1924 mp->mnt_stat.f_ffree = 0; 1925 mp->mnt_stat.f_blocks = 0; 1926 mp->mnt_stat.f_bfree = 0; 1927 mp->mnt_stat.f_bavail = 0; 1928 1929 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1930 hmp = pmp->pfs_hmps[i]; 1931 if (hmp == NULL) 1932 continue; 1933 if (pmp->iroot->cluster.array[i].chain) 1934 bref = pmp->iroot->cluster.array[i].chain->bref; 1935 else 1936 bzero(&bref, sizeof(bref)); 1937 1938 mp->mnt_stat.f_files = bref.embed.stats.inode_count; 1939 mp->mnt_stat.f_ffree = 0; 1940 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / 1941 mp->mnt_vstat.f_bsize; 1942 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free / 1943 mp->mnt_vstat.f_bsize; 1944 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; 1945 1946 if (cred && cred->cr_uid != 0) { 1947 uint64_t adj; 1948 1949 /* 5% */ 1950 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 1951 mp->mnt_stat.f_blocks -= adj; 1952 mp->mnt_stat.f_bfree -= adj; 1953 mp->mnt_stat.f_bavail -= adj; 1954 } 1955 1956 *sbp = mp->mnt_stat; 1957 } 1958 return (0); 1959 } 1960 1961 static 1962 int 1963 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1964 { 1965 hammer2_pfs_t *pmp; 1966 hammer2_dev_t *hmp; 1967 hammer2_blockref_t bref; 1968 int i; 1969 1970 /* 1971 * NOTE: iroot might not have validated the cluster yet. 1972 */ 1973 pmp = MPTOPMP(mp); 1974 1975 mp->mnt_vstat.f_bsize = 0; 1976 mp->mnt_vstat.f_files = 0; 1977 mp->mnt_vstat.f_ffree = 0; 1978 mp->mnt_vstat.f_blocks = 0; 1979 mp->mnt_vstat.f_bfree = 0; 1980 mp->mnt_vstat.f_bavail = 0; 1981 1982 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1983 hmp = pmp->pfs_hmps[i]; 1984 if (hmp == NULL) 1985 continue; 1986 if (pmp->iroot->cluster.array[i].chain) 1987 bref = pmp->iroot->cluster.array[i].chain->bref; 1988 else 1989 bzero(&bref, sizeof(bref)); 1990 1991 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1992 mp->mnt_vstat.f_files = bref.embed.stats.inode_count; 1993 mp->mnt_vstat.f_ffree = 0; 1994 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / 1995 mp->mnt_vstat.f_bsize; 1996 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free / 1997 mp->mnt_vstat.f_bsize; 1998 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree; 1999 2000 if (cred && cred->cr_uid != 0) { 2001 uint64_t adj; 2002 2003 /* 5% */ 2004 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2005 mp->mnt_vstat.f_blocks -= adj; 2006 mp->mnt_vstat.f_bfree -= adj; 2007 mp->mnt_vstat.f_bavail -= adj; 2008 } 2009 2010 *sbp = mp->mnt_vstat; 2011 } 2012 return (0); 2013 } 2014 2015 /* 2016 * Mount-time recovery (RW mounts) 2017 * 2018 * Updates to the free block table are allowed to lag flushes by one 2019 * transaction. In case of a crash, then on a fresh mount we must do an 2020 * incremental scan of the last committed transaction id and make sure that 2021 * all related blocks have been marked allocated. 2022 * 2023 * The super-root topology and each PFS has its own transaction id domain, 2024 * so we must track PFS boundary transitions. 2025 */ 2026 struct hammer2_recovery_elm { 2027 TAILQ_ENTRY(hammer2_recovery_elm) entry; 2028 hammer2_chain_t *chain; 2029 hammer2_tid_t sync_tid; 2030 }; 2031 2032 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 2033 2034 struct hammer2_recovery_info { 2035 struct hammer2_recovery_list list; 2036 hammer2_tid_t mtid; 2037 int depth; 2038 }; 2039 2040 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 2041 hammer2_chain_t *parent, 2042 struct hammer2_recovery_info *info, 2043 hammer2_tid_t sync_tid); 2044 2045 #define HAMMER2_RECOVERY_MAXDEPTH 10 2046 2047 static 2048 int 2049 hammer2_recovery(hammer2_dev_t *hmp) 2050 { 2051 struct hammer2_recovery_info info; 2052 struct hammer2_recovery_elm *elm; 2053 hammer2_chain_t *parent; 2054 hammer2_tid_t sync_tid; 2055 hammer2_tid_t mirror_tid; 2056 int error; 2057 2058 hammer2_trans_init(hmp->spmp, 0); 2059 2060 sync_tid = hmp->voldata.freemap_tid; 2061 mirror_tid = hmp->voldata.mirror_tid; 2062 2063 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 2064 if (sync_tid >= mirror_tid) { 2065 kprintf(" no recovery needed\n"); 2066 } else { 2067 kprintf(" freemap recovery %016jx-%016jx\n", 2068 sync_tid + 1, mirror_tid); 2069 } 2070 2071 TAILQ_INIT(&info.list); 2072 info.depth = 0; 2073 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 2074 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 2075 hammer2_chain_lookup_done(parent); 2076 2077 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 2078 TAILQ_REMOVE(&info.list, elm, entry); 2079 parent = elm->chain; 2080 sync_tid = elm->sync_tid; 2081 kfree(elm, M_HAMMER2); 2082 2083 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2084 error |= hammer2_recovery_scan(hmp, parent, &info, 2085 hmp->voldata.freemap_tid); 2086 hammer2_chain_unlock(parent); 2087 hammer2_chain_drop(parent); /* drop elm->chain ref */ 2088 } 2089 hammer2_trans_done(hmp->spmp); 2090 2091 return error; 2092 } 2093 2094 static 2095 int 2096 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 2097 struct hammer2_recovery_info *info, 2098 hammer2_tid_t sync_tid) 2099 { 2100 const hammer2_inode_data_t *ripdata; 2101 hammer2_chain_t *chain; 2102 hammer2_blockref_t bref; 2103 int tmp_error; 2104 int rup_error; 2105 int error; 2106 int first; 2107 2108 /* 2109 * Adjust freemap to ensure that the block(s) are marked allocated. 2110 */ 2111 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2112 hammer2_freemap_adjust(hmp, &parent->bref, 2113 HAMMER2_FREEMAP_DORECOVER); 2114 } 2115 2116 /* 2117 * Check type for recursive scan 2118 */ 2119 switch(parent->bref.type) { 2120 case HAMMER2_BREF_TYPE_VOLUME: 2121 /* data already instantiated */ 2122 break; 2123 case HAMMER2_BREF_TYPE_INODE: 2124 /* 2125 * Must instantiate data for DIRECTDATA test and also 2126 * for recursion. 2127 */ 2128 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2129 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2130 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2131 /* not applicable to recovery scan */ 2132 hammer2_chain_unlock(parent); 2133 return 0; 2134 } 2135 hammer2_chain_unlock(parent); 2136 break; 2137 case HAMMER2_BREF_TYPE_INDIRECT: 2138 /* 2139 * Must instantiate data for recursion 2140 */ 2141 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2142 hammer2_chain_unlock(parent); 2143 break; 2144 case HAMMER2_BREF_TYPE_DIRENT: 2145 case HAMMER2_BREF_TYPE_DATA: 2146 case HAMMER2_BREF_TYPE_FREEMAP: 2147 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2148 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2149 /* not applicable to recovery scan */ 2150 return 0; 2151 break; 2152 default: 2153 return HAMMER2_ERROR_BADBREF; 2154 } 2155 2156 /* 2157 * Defer operation if depth limit reached or if we are crossing a 2158 * PFS boundary. 2159 */ 2160 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2161 struct hammer2_recovery_elm *elm; 2162 2163 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2164 elm->chain = parent; 2165 elm->sync_tid = sync_tid; 2166 hammer2_chain_ref(parent); 2167 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2168 /* unlocked by caller */ 2169 2170 return(0); 2171 } 2172 2173 2174 /* 2175 * Recursive scan of the last flushed transaction only. We are 2176 * doing this without pmp assignments so don't leave the chains 2177 * hanging around after we are done with them. 2178 * 2179 * error Cumulative error this level only 2180 * rup_error Cumulative error for recursion 2181 * tmp_error Specific non-cumulative recursion error 2182 */ 2183 chain = NULL; 2184 first = 1; 2185 rup_error = 0; 2186 error = 0; 2187 2188 for (;;) { 2189 error |= hammer2_chain_scan(parent, &chain, &bref, 2190 &first, 2191 HAMMER2_LOOKUP_NODATA); 2192 2193 /* 2194 * Problem during scan or EOF 2195 */ 2196 if (error) 2197 break; 2198 2199 /* 2200 * If this is a leaf 2201 */ 2202 if (chain == NULL) { 2203 if (bref.mirror_tid > sync_tid) { 2204 hammer2_freemap_adjust(hmp, &bref, 2205 HAMMER2_FREEMAP_DORECOVER); 2206 } 2207 continue; 2208 } 2209 2210 /* 2211 * This may or may not be a recursive node. 2212 */ 2213 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2214 if (bref.mirror_tid > sync_tid) { 2215 ++info->depth; 2216 tmp_error = hammer2_recovery_scan(hmp, chain, 2217 info, sync_tid); 2218 --info->depth; 2219 } else { 2220 tmp_error = 0; 2221 } 2222 2223 /* 2224 * Flush the recovery at the PFS boundary to stage it for 2225 * the final flush of the super-root topology. 2226 */ 2227 if (tmp_error == 0 && 2228 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2229 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2230 hammer2_flush(chain, HAMMER2_FLUSH_TOP); 2231 } 2232 rup_error |= tmp_error; 2233 } 2234 return ((error | rup_error) & ~HAMMER2_ERROR_EOF); 2235 } 2236 2237 /* 2238 * Sync a mount point; this is called on a per-mount basis from the 2239 * filesystem syncer process periodically and whenever a user issues 2240 * a sync. 2241 */ 2242 int 2243 hammer2_vfs_sync(struct mount *mp, int waitfor) 2244 { 2245 hammer2_xop_flush_t *xop; 2246 struct hammer2_sync_info info; 2247 hammer2_inode_t *iroot; 2248 hammer2_pfs_t *pmp; 2249 int flags; 2250 int error; 2251 2252 pmp = MPTOPMP(mp); 2253 iroot = pmp->iroot; 2254 KKASSERT(iroot); 2255 KKASSERT(iroot->pmp == pmp); 2256 2257 /* 2258 * We can't acquire locks on existing vnodes while in a transaction 2259 * without risking a deadlock. This assumes that vfsync() can be 2260 * called without the vnode locked (which it can in DragonFly). 2261 * Otherwise we'd have to implement a multi-pass or flag the lock 2262 * failures and retry. 2263 * 2264 * The reclamation code interlocks with the sync list's token 2265 * (by removing the vnode from the scan list) before unlocking 2266 * the inode, giving us time to ref the inode. 2267 */ 2268 /*flags = VMSC_GETVP;*/ 2269 flags = 0; 2270 if (waitfor & MNT_LAZY) 2271 flags |= VMSC_ONEPASS; 2272 2273 /* 2274 * Preflush the vnodes using a normal transaction before interlocking 2275 * with a flush transaction. We do this to try to run as much of 2276 * the compression as possible outside the flush transaction. 2277 * 2278 * For efficiency do an async pass before making sure with a 2279 * synchronous pass on all related buffer cache buffers. 2280 */ 2281 hammer2_trans_init(pmp, 0); 2282 info.error = 0; 2283 info.waitfor = MNT_NOWAIT; 2284 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2285 info.waitfor = MNT_WAIT; 2286 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2287 hammer2_trans_done(pmp); 2288 2289 /* 2290 * Start our flush transaction. This does not return until all 2291 * concurrent transactions have completed and will prevent any 2292 * new transactions from running concurrently, except for the 2293 * buffer cache transactions. 2294 * 2295 * NOTE! It is still possible for the paging code to push pages 2296 * out via a UIO_NOCOPY hammer2_vop_write() during the main 2297 * flush. 2298 */ 2299 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2300 hammer2_inode_run_sideq(pmp); 2301 2302 info.error = 0; 2303 info.waitfor = MNT_NOWAIT; 2304 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2305 info.waitfor = MNT_WAIT; 2306 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2307 hammer2_bioq_sync(pmp); 2308 2309 /* 2310 * Use the XOP interface to concurrently flush all nodes to 2311 * synchronize the PFSROOT subtopology to the media. A standard 2312 * end-of-scan ENOENT error indicates cluster sufficiency. 2313 * 2314 * Note that this flush will not be visible on crash recovery until 2315 * we flush the super-root topology in the next loop. 2316 * 2317 * XXX For now wait for all flushes to complete. 2318 */ 2319 if (iroot) { 2320 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 2321 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 2322 error = hammer2_xop_collect(&xop->head, 2323 HAMMER2_XOP_COLLECT_WAITALL); 2324 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2325 if (error == HAMMER2_ERROR_ENOENT) 2326 error = 0; 2327 else 2328 error = hammer2_error_to_errno(error); 2329 } else { 2330 error = 0; 2331 } 2332 hammer2_trans_done(pmp); 2333 2334 return (error); 2335 } 2336 2337 /* 2338 * Sync passes. 2339 * 2340 * Note that we ignore the tranasction mtid we got above. Instead, 2341 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 2342 * transactions. 2343 */ 2344 static int 2345 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 2346 { 2347 struct hammer2_sync_info *info = data; 2348 hammer2_inode_t *ip; 2349 int error; 2350 2351 /* 2352 * Degenerate cases. Note that ip == NULL typically means the 2353 * syncer vnode itself and we don't want to vclrisdirty() in that 2354 * situation. 2355 */ 2356 ip = VTOI(vp); 2357 if (ip == NULL) { 2358 return(0); 2359 } 2360 if (vp->v_type == VNON || vp->v_type == VBAD) { 2361 vclrisdirty(vp); 2362 return(0); 2363 } 2364 2365 /* 2366 * VOP_FSYNC will start a new transaction so replicate some code 2367 * here to do it inline (see hammer2_vop_fsync()). 2368 * 2369 * WARNING: The vfsync interacts with the buffer cache and might 2370 * block, we can't hold the inode lock at that time. 2371 * However, we MUST ref ip before blocking to ensure that 2372 * it isn't ripped out from under us (since we do not 2373 * hold a lock on the vnode). 2374 */ 2375 hammer2_inode_ref(ip); 2376 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2377 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2378 vfsync(vp, info->waitfor, 1, NULL, NULL); 2379 if (ip->flags & (HAMMER2_INODE_RESIZED | 2380 HAMMER2_INODE_MODIFIED)) { 2381 hammer2_inode_lock(ip, 0); 2382 if (ip->flags & (HAMMER2_INODE_RESIZED | 2383 HAMMER2_INODE_MODIFIED)) { 2384 hammer2_inode_chain_sync(ip); 2385 } 2386 hammer2_inode_unlock(ip); 2387 } 2388 } 2389 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2390 RB_EMPTY(&vp->v_rbdirty_tree)) { 2391 vclrisdirty(vp); 2392 } 2393 2394 hammer2_inode_drop(ip); 2395 #if 1 2396 error = 0; 2397 if (error) 2398 info->error = error; 2399 #endif 2400 return(0); 2401 } 2402 2403 static 2404 int 2405 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2406 { 2407 hammer2_inode_t *ip; 2408 2409 KKASSERT(MAXFIDSZ >= 16); 2410 ip = VTOI(vp); 2411 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2412 fhp->fid_ext = 0; 2413 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2414 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2415 2416 return 0; 2417 } 2418 2419 static 2420 int 2421 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2422 struct fid *fhp, struct vnode **vpp) 2423 { 2424 hammer2_pfs_t *pmp; 2425 hammer2_tid_t inum; 2426 int error; 2427 2428 pmp = MPTOPMP(mp); 2429 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2430 if (vpp) { 2431 if (inum == 1) 2432 error = hammer2_vfs_root(mp, vpp); 2433 else 2434 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2435 } else { 2436 error = 0; 2437 } 2438 if (error) 2439 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2440 return error; 2441 } 2442 2443 static 2444 int 2445 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2446 int *exflagsp, struct ucred **credanonp) 2447 { 2448 hammer2_pfs_t *pmp; 2449 struct netcred *np; 2450 int error; 2451 2452 pmp = MPTOPMP(mp); 2453 np = vfs_export_lookup(mp, &pmp->export, nam); 2454 if (np) { 2455 *exflagsp = np->netc_exflags; 2456 *credanonp = &np->netc_anon; 2457 error = 0; 2458 } else { 2459 error = EACCES; 2460 } 2461 return error; 2462 } 2463 2464 /* 2465 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2466 * header into the HMP 2467 * 2468 * XXX read four volhdrs and use the one with the highest TID whos CRC 2469 * matches. 2470 * 2471 * XXX check iCRCs. 2472 * 2473 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2474 * nonexistant locations. 2475 * 2476 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2477 */ 2478 static 2479 int 2480 hammer2_install_volume_header(hammer2_dev_t *hmp) 2481 { 2482 hammer2_volume_data_t *vd; 2483 struct buf *bp; 2484 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2485 int error_reported; 2486 int error; 2487 int valid; 2488 int i; 2489 2490 error_reported = 0; 2491 error = 0; 2492 valid = 0; 2493 bp = NULL; 2494 2495 /* 2496 * There are up to 4 copies of the volume header (syncs iterate 2497 * between them so there is no single master). We don't trust the 2498 * volu_size field so we don't know precisely how large the filesystem 2499 * is, so depend on the OS to return an error if we go beyond the 2500 * block device's EOF. 2501 */ 2502 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2503 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2504 HAMMER2_VOLUME_BYTES, &bp); 2505 if (error) { 2506 brelse(bp); 2507 bp = NULL; 2508 continue; 2509 } 2510 2511 vd = (struct hammer2_volume_data *) bp->b_data; 2512 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2513 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2514 brelse(bp); 2515 bp = NULL; 2516 continue; 2517 } 2518 2519 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2520 /* XXX: Reversed-endianness filesystem */ 2521 kprintf("hammer2: reverse-endian filesystem detected"); 2522 brelse(bp); 2523 bp = NULL; 2524 continue; 2525 } 2526 2527 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2528 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2529 HAMMER2_VOLUME_ICRC0_SIZE); 2530 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2531 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2532 HAMMER2_VOLUME_ICRC1_SIZE); 2533 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2534 kprintf("hammer2 volume header crc " 2535 "mismatch copy #%d %08x/%08x\n", 2536 i, crc0, crc); 2537 error_reported = 1; 2538 brelse(bp); 2539 bp = NULL; 2540 continue; 2541 } 2542 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2543 valid = 1; 2544 hmp->voldata = *vd; 2545 hmp->volhdrno = i; 2546 } 2547 brelse(bp); 2548 bp = NULL; 2549 } 2550 if (valid) { 2551 hmp->volsync = hmp->voldata; 2552 hmp->free_reserved = hmp->voldata.allocator_size / 20; 2553 error = 0; 2554 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2555 kprintf("hammer2: using volume header #%d\n", 2556 hmp->volhdrno); 2557 } 2558 } else { 2559 error = EINVAL; 2560 kprintf("hammer2: no valid volume headers found!\n"); 2561 } 2562 return (error); 2563 } 2564 2565 /* 2566 * This handles hysteresis on regular file flushes. Because the BIOs are 2567 * routed to a thread it is possible for an excessive number to build up 2568 * and cause long front-end stalls long before the runningbuffspace limit 2569 * is hit, so we implement hammer2_flush_pipe to control the 2570 * hysteresis. 2571 * 2572 * This is a particular problem when compression is used. 2573 */ 2574 void 2575 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2576 { 2577 atomic_add_int(&pmp->count_lwinprog, 1); 2578 } 2579 2580 void 2581 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2582 { 2583 int lwinprog; 2584 2585 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2586 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2587 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2588 atomic_clear_int(&pmp->count_lwinprog, 2589 HAMMER2_LWINPROG_WAITING); 2590 wakeup(&pmp->count_lwinprog); 2591 } 2592 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2593 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2594 atomic_clear_int(&pmp->count_lwinprog, 2595 HAMMER2_LWINPROG_WAITING0); 2596 wakeup(&pmp->count_lwinprog); 2597 } 2598 } 2599 2600 void 2601 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2602 { 2603 int lwinprog; 2604 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2605 HAMMER2_LWINPROG_WAITING0; 2606 2607 for (;;) { 2608 lwinprog = pmp->count_lwinprog; 2609 cpu_ccfence(); 2610 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2611 break; 2612 tsleep_interlock(&pmp->count_lwinprog, 0); 2613 atomic_set_int(&pmp->count_lwinprog, lwflag); 2614 lwinprog = pmp->count_lwinprog; 2615 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2616 break; 2617 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2618 } 2619 } 2620 2621 /* 2622 * Manage excessive memory resource use for chain and related 2623 * structures. 2624 */ 2625 void 2626 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2627 { 2628 uint32_t waiting; 2629 uint32_t count; 2630 uint32_t limit; 2631 #if 0 2632 static int zzticks; 2633 #endif 2634 2635 /* 2636 * Atomic check condition and wait. Also do an early speedup of 2637 * the syncer to try to avoid hitting the wait. 2638 */ 2639 for (;;) { 2640 waiting = pmp->inmem_dirty_chains; 2641 cpu_ccfence(); 2642 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2643 2644 limit = pmp->mp->mnt_nvnodelistsize / 10; 2645 if (limit < hammer2_limit_dirty_chains) 2646 limit = hammer2_limit_dirty_chains; 2647 if (limit < 1000) 2648 limit = 1000; 2649 2650 #if 0 2651 if ((int)(ticks - zzticks) > hz) { 2652 zzticks = ticks; 2653 kprintf("count %ld %ld\n", count, limit); 2654 } 2655 #endif 2656 2657 /* 2658 * Block if there are too many dirty chains present, wait 2659 * for the flush to clean some out. 2660 */ 2661 if (count > limit) { 2662 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2663 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2664 waiting, 2665 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2666 speedup_syncer(pmp->mp); 2667 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2668 "chnmem", hz); 2669 } 2670 continue; /* loop on success or fail */ 2671 } 2672 2673 /* 2674 * Try to start an early flush before we are forced to block. 2675 */ 2676 if (count > limit * 7 / 10) 2677 speedup_syncer(pmp->mp); 2678 break; 2679 } 2680 } 2681 2682 void 2683 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2684 { 2685 if (pmp) { 2686 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2687 } 2688 } 2689 2690 void 2691 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2692 { 2693 uint32_t waiting; 2694 2695 if (pmp == NULL) 2696 return; 2697 2698 for (;;) { 2699 waiting = pmp->inmem_dirty_chains; 2700 cpu_ccfence(); 2701 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2702 waiting, 2703 (waiting - 1) & 2704 ~HAMMER2_DIRTYCHAIN_WAITING)) { 2705 break; 2706 } 2707 } 2708 2709 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) 2710 wakeup(&pmp->inmem_dirty_chains); 2711 } 2712 2713 /* 2714 * Returns 0 if the filesystem has tons of free space 2715 * Returns 1 if the filesystem has less than 10% remaining 2716 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining. 2717 */ 2718 int 2719 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred) 2720 { 2721 hammer2_pfs_t *pmp; 2722 hammer2_dev_t *hmp; 2723 hammer2_off_t free_reserved; 2724 hammer2_off_t free_nominal; 2725 int i; 2726 2727 pmp = ip->pmp; 2728 2729 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) { 2730 free_reserved = HAMMER2_SEGSIZE; 2731 free_nominal = 0x7FFFFFFFFFFFFFFFLLU; 2732 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2733 hmp = pmp->pfs_hmps[i]; 2734 if (hmp == NULL) 2735 continue; 2736 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER && 2737 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER) 2738 continue; 2739 2740 if (free_nominal > hmp->voldata.allocator_free) 2741 free_nominal = hmp->voldata.allocator_free; 2742 if (free_reserved < hmp->free_reserved) 2743 free_reserved = hmp->free_reserved; 2744 } 2745 2746 /* 2747 * SMP races ok 2748 */ 2749 pmp->free_reserved = free_reserved; 2750 pmp->free_nominal = free_nominal; 2751 pmp->free_ticks = ticks; 2752 } else { 2753 free_reserved = pmp->free_reserved; 2754 free_nominal = pmp->free_nominal; 2755 } 2756 if (cred && cred->cr_uid != 0) { 2757 if ((int64_t)(free_nominal - bytes) < 2758 (int64_t)free_reserved) { 2759 return 2; 2760 } 2761 } else { 2762 if ((int64_t)(free_nominal - bytes) < 2763 (int64_t)free_reserved / 2) { 2764 return 2; 2765 } 2766 } 2767 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2) 2768 return 1; 2769 return 0; 2770 } 2771 2772 /* 2773 * Debugging 2774 */ 2775 void 2776 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2777 { 2778 hammer2_chain_t *scan; 2779 hammer2_chain_t *parent; 2780 2781 --*countp; 2782 if (*countp == 0) { 2783 kprintf("%*.*s...\n", tab, tab, ""); 2784 return; 2785 } 2786 if (*countp < 0) 2787 return; 2788 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2789 tab, tab, "", pfx, 2790 chain, chain->bref.type, 2791 chain->bref.key, chain->bref.keybits, 2792 chain->bref.mirror_tid); 2793 2794 kprintf("%*.*s [%08x] (%s) refs=%d", 2795 tab, tab, "", 2796 chain->flags, 2797 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2798 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2799 chain->refs); 2800 2801 parent = chain->parent; 2802 if (parent) 2803 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2804 tab, tab, "", 2805 parent, parent->flags, parent->refs); 2806 if (RB_EMPTY(&chain->core.rbtree)) { 2807 kprintf("\n"); 2808 } else { 2809 kprintf(" {\n"); 2810 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2811 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2812 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2813 kprintf("%*.*s}(%s)\n", tab, tab, "", 2814 chain->data->ipdata.filename); 2815 else 2816 kprintf("%*.*s}\n", tab, tab, ""); 2817 } 2818 } 2819