1 /* 2 * Copyright (c) 2011-2017 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_supported_version = HAMMER2_VOL_VERSION_DEFAULT; 81 int hammer2_debug; 82 int hammer2_cluster_meta_read = 1; /* physical read-ahead */ 83 int hammer2_cluster_data_read = 4; /* physical read-ahead */ 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 int hammer2_bulkfree_tps = 5000; 92 long hammer2_chain_allocs; 93 long hammer2_chain_frees; 94 long hammer2_limit_dirty_chains; 95 long hammer2_count_modified_chains; 96 long hammer2_iod_invals; 97 long hammer2_iod_file_read; 98 long hammer2_iod_meta_read; 99 long hammer2_iod_indr_read; 100 long hammer2_iod_fmap_read; 101 long hammer2_iod_volu_read; 102 long hammer2_iod_file_write; 103 long hammer2_iod_file_wembed; 104 long hammer2_iod_file_wzero; 105 long hammer2_iod_file_wdedup; 106 long hammer2_iod_meta_write; 107 long hammer2_iod_indr_write; 108 long hammer2_iod_fmap_write; 109 long hammer2_iod_volu_write; 110 111 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 112 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 113 "Buffer used for compression."); 114 115 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 116 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 117 "Buffer used for decompression."); 118 119 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 120 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD, 122 &hammer2_supported_version, 0, ""); 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 124 &hammer2_debug, 0, ""); 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW, 126 &hammer2_cluster_meta_read, 0, ""); 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW, 128 &hammer2_cluster_data_read, 0, ""); 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 130 &hammer2_dedup_enable, 0, ""); 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW, 132 &hammer2_always_compress, 0, ""); 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW, 134 &hammer2_inval_enable, 0, ""); 135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 136 &hammer2_flush_pipe, 0, ""); 137 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW, 138 &hammer2_synchronous_flush, 0, ""); 139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW, 140 &hammer2_bulkfree_tps, 0, ""); 141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW, 142 &hammer2_chain_allocs, 0, ""); 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW, 144 &hammer2_chain_frees, 0, ""); 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 146 &hammer2_limit_dirty_chains, 0, ""); 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW, 148 &hammer2_count_modified_chains, 0, ""); 149 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 150 &hammer2_dio_count, 0, ""); 151 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_dio, CTLFLAG_RW, 152 &hammer2_limit_dio, 0, ""); 153 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW, 155 &hammer2_iod_invals, 0, ""); 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 157 &hammer2_iod_file_read, 0, ""); 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 159 &hammer2_iod_meta_read, 0, ""); 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 161 &hammer2_iod_indr_read, 0, ""); 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 163 &hammer2_iod_fmap_read, 0, ""); 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 165 &hammer2_iod_volu_read, 0, ""); 166 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 168 &hammer2_iod_file_write, 0, ""); 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW, 170 &hammer2_iod_file_wembed, 0, ""); 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW, 172 &hammer2_iod_file_wzero, 0, ""); 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW, 174 &hammer2_iod_file_wdedup, 0, ""); 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 176 &hammer2_iod_meta_write, 0, ""); 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 178 &hammer2_iod_indr_write, 0, ""); 179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 180 &hammer2_iod_fmap_write, 0, ""); 181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 182 &hammer2_iod_volu_write, 0, ""); 183 184 long hammer2_check_icrc32; 185 long hammer2_check_xxhash64; 186 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW, 187 &hammer2_check_icrc32, 0, ""); 188 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW, 189 &hammer2_check_xxhash64, 0, ""); 190 191 static int hammer2_vfs_init(struct vfsconf *conf); 192 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 193 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 194 struct ucred *cred); 195 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 196 struct vnode *, struct ucred *); 197 static int hammer2_recovery(hammer2_dev_t *hmp); 198 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 199 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 200 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 201 struct ucred *cred); 202 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 203 struct ucred *cred); 204 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 205 struct fid *fhp, struct vnode **vpp); 206 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 207 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 208 int *exflagsp, struct ucred **credanonp); 209 210 static int hammer2_install_volume_header(hammer2_dev_t *hmp); 211 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 212 213 static void hammer2_update_pmps(hammer2_dev_t *hmp); 214 215 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 216 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 217 hammer2_dev_t *hmp); 218 219 /* 220 * HAMMER2 vfs operations. 221 */ 222 static struct vfsops hammer2_vfsops = { 223 .vfs_init = hammer2_vfs_init, 224 .vfs_uninit = hammer2_vfs_uninit, 225 .vfs_sync = hammer2_vfs_sync, 226 .vfs_mount = hammer2_vfs_mount, 227 .vfs_unmount = hammer2_vfs_unmount, 228 .vfs_root = hammer2_vfs_root, 229 .vfs_statfs = hammer2_vfs_statfs, 230 .vfs_statvfs = hammer2_vfs_statvfs, 231 .vfs_vget = hammer2_vfs_vget, 232 .vfs_vptofh = hammer2_vfs_vptofh, 233 .vfs_fhtovp = hammer2_vfs_fhtovp, 234 .vfs_checkexp = hammer2_vfs_checkexp 235 }; 236 237 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 238 239 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE); 240 MODULE_VERSION(hammer2, 1); 241 242 static 243 int 244 hammer2_vfs_init(struct vfsconf *conf) 245 { 246 static struct objcache_malloc_args margs_read; 247 static struct objcache_malloc_args margs_write; 248 static struct objcache_malloc_args margs_vop; 249 250 int error; 251 252 error = 0; 253 254 /* 255 * A large DIO cache is needed to retain dedup enablement masks. 256 * The bulkfree code clears related masks as part of the disk block 257 * recycling algorithm, preventing it from being used for a later 258 * dedup. 259 * 260 * NOTE: A large buffer cache can actually interfere with dedup 261 * operation because we dedup based on media physical buffers 262 * and not logical buffers. Try to make the DIO chace large 263 * enough to avoid this problem, but also cap it. 264 */ 265 hammer2_limit_dio = nbuf * 2; 266 if (hammer2_limit_dio > 100000) 267 hammer2_limit_dio = 100000; 268 269 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 270 error = EINVAL; 271 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 272 error = EINVAL; 273 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 274 error = EINVAL; 275 276 if (error) 277 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 278 279 margs_read.objsize = 65536; 280 margs_read.mtype = M_HAMMER2_DEBUFFER; 281 282 margs_write.objsize = 32768; 283 margs_write.mtype = M_HAMMER2_CBUFFER; 284 285 margs_vop.objsize = sizeof(hammer2_xop_t); 286 margs_vop.mtype = M_HAMMER2; 287 288 /* 289 * Note thaht for the XOPS cache we want backing store allocations 290 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 291 * confusion), so use the backing store function that does it. This 292 * means that initial XOPS objects are zerod but REUSED objects are 293 * not. So we are responsible for cleaning the object up sufficiently 294 * for our needs before objcache_put()ing it back (typically just the 295 * FIFO indices). 296 */ 297 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 298 0, 1, NULL, NULL, NULL, 299 objcache_malloc_alloc, 300 objcache_malloc_free, 301 &margs_read); 302 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 303 0, 1, NULL, NULL, NULL, 304 objcache_malloc_alloc, 305 objcache_malloc_free, 306 &margs_write); 307 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 308 0, 1, NULL, NULL, NULL, 309 objcache_malloc_alloc_zero, 310 objcache_malloc_free, 311 &margs_vop); 312 313 314 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 315 TAILQ_INIT(&hammer2_mntlist); 316 TAILQ_INIT(&hammer2_pfslist); 317 318 hammer2_limit_dirty_chains = maxvnodes / 10; 319 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 320 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 321 322 return (error); 323 } 324 325 static 326 int 327 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 328 { 329 objcache_destroy(cache_buffer_read); 330 objcache_destroy(cache_buffer_write); 331 objcache_destroy(cache_xops); 332 return 0; 333 } 334 335 /* 336 * Core PFS allocator. Used to allocate or reference the pmp structure 337 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 338 * The pmp can be passed in or loaded by this function using the chain and 339 * inode data. 340 * 341 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 342 * transactions. Note that synchronization does not use this field. 343 * (typically frontend operations and synchronization cannot run on the 344 * same PFS node at the same time). 345 * 346 * XXX check locking 347 */ 348 hammer2_pfs_t * 349 hammer2_pfsalloc(hammer2_chain_t *chain, 350 const hammer2_inode_data_t *ripdata, 351 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 352 { 353 hammer2_pfs_t *pmp; 354 hammer2_inode_t *iroot; 355 int count; 356 int i; 357 int j; 358 359 pmp = NULL; 360 361 /* 362 * Locate or create the PFS based on the cluster id. If ripdata 363 * is NULL this is a spmp which is unique and is always allocated. 364 * 365 * If the device is mounted in local mode all PFSs are considered 366 * independent and not part of any cluster (for debugging only). 367 */ 368 if (ripdata) { 369 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 370 if (force_local != pmp->force_local) 371 continue; 372 if (force_local == NULL && 373 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 374 sizeof(pmp->pfs_clid)) == 0) { 375 break; 376 } else if (force_local && pmp->pfs_names[0] && 377 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 378 break; 379 } 380 } 381 } 382 383 if (pmp == NULL) { 384 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 385 pmp->force_local = force_local; 386 hammer2_trans_manage_init(pmp); 387 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 388 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 389 lockinit(&pmp->lock, "pfslk", 0, 0); 390 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 391 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 392 spin_init(&pmp->xop_spin, "h2xop"); 393 spin_init(&pmp->lru_spin, "h2lru"); 394 RB_INIT(&pmp->inum_tree); 395 TAILQ_INIT(&pmp->sideq); 396 TAILQ_INIT(&pmp->lru_list); 397 spin_init(&pmp->list_spin, "hm2pfsalloc_list"); 398 399 /* 400 * Distribute backend operations to threads 401 */ 402 for (i = 0; i < HAMMER2_XOPGROUPS; ++i) 403 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]); 404 405 /* 406 * Save the last media transaction id for the flusher. Set 407 * initial 408 */ 409 if (ripdata) 410 pmp->pfs_clid = ripdata->meta.pfs_clid; 411 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 412 413 /* 414 * The synchronization thread may start too early, make 415 * sure it stays frozen until we are ready to let it go. 416 * XXX 417 */ 418 /* 419 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 420 HAMMER2_THREAD_REMASTER; 421 */ 422 } 423 424 /* 425 * Create the PFS's root inode and any missing XOP helper threads. 426 */ 427 if ((iroot = pmp->iroot) == NULL) { 428 iroot = hammer2_inode_get(pmp, NULL, NULL, -1); 429 if (ripdata) 430 iroot->meta = ripdata->meta; 431 pmp->iroot = iroot; 432 hammer2_inode_ref(iroot); 433 hammer2_inode_unlock(iroot); 434 } 435 436 /* 437 * Stop here if no chain is passed in. 438 */ 439 if (chain == NULL) 440 goto done; 441 442 /* 443 * When a chain is passed in we must add it to the PFS's root 444 * inode, update pmp->pfs_types[], and update the syncronization 445 * threads. 446 * 447 * When forcing local mode, mark the PFS as a MASTER regardless. 448 * 449 * At the moment empty spots can develop due to removals or failures. 450 * Ultimately we want to re-fill these spots but doing so might 451 * confused running code. XXX 452 */ 453 hammer2_inode_ref(iroot); 454 hammer2_mtx_ex(&iroot->lock); 455 j = iroot->cluster.nchains; 456 457 if (j == HAMMER2_MAXCLUSTER) { 458 kprintf("hammer2_mount: cluster full!\n"); 459 /* XXX fatal error? */ 460 } else { 461 KKASSERT(chain->pmp == NULL); 462 chain->pmp = pmp; 463 hammer2_chain_ref(chain); 464 iroot->cluster.array[j].chain = chain; 465 if (force_local) 466 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 467 else 468 pmp->pfs_types[j] = ripdata->meta.pfs_type; 469 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 470 pmp->pfs_hmps[j] = chain->hmp; 471 472 /* 473 * If the PFS is already mounted we must account 474 * for the mount_count here. 475 */ 476 if (pmp->mp) 477 ++chain->hmp->mount_count; 478 479 /* 480 * May have to fixup dirty chain tracking. Previous 481 * pmp was NULL so nothing to undo. 482 */ 483 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 484 hammer2_pfs_memory_inc(pmp); 485 ++j; 486 } 487 iroot->cluster.nchains = j; 488 489 /* 490 * Update nmasters from any PFS inode which is part of the cluster. 491 * It is possible that this will result in a value which is too 492 * high. MASTER PFSs are authoritative for pfs_nmasters and will 493 * override this value later on. 494 * 495 * (This informs us of masters that might not currently be 496 * discoverable by this mount). 497 */ 498 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 499 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 500 } 501 502 /* 503 * Count visible masters. Masters are usually added with 504 * ripdata->meta.pfs_nmasters set to 1. This detects when there 505 * are more (XXX and must update the master inodes). 506 */ 507 count = 0; 508 for (i = 0; i < iroot->cluster.nchains; ++i) { 509 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 510 ++count; 511 } 512 if (pmp->pfs_nmasters < count) 513 pmp->pfs_nmasters = count; 514 515 /* 516 * Create missing synchronization and support threads. 517 * 518 * Single-node masters (including snapshots) have nothing to 519 * synchronize and do not require this thread. 520 * 521 * Multi-node masters or any number of soft masters, slaves, copy, 522 * or other PFS types need the thread. 523 * 524 * Each thread is responsible for its particular cluster index. 525 * We use independent threads so stalls or mismatches related to 526 * any given target do not affect other targets. 527 */ 528 for (i = 0; i < iroot->cluster.nchains; ++i) { 529 /* 530 * Single-node masters (including snapshots) have nothing 531 * to synchronize and will make direct xops support calls, 532 * thus they do not require this thread. 533 * 534 * Note that there can be thousands of snapshots. We do not 535 * want to create thousands of threads. 536 */ 537 if (pmp->pfs_nmasters <= 1 && 538 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 539 continue; 540 } 541 542 /* 543 * Sync support thread 544 */ 545 if (pmp->sync_thrs[i].td == NULL) { 546 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL, 547 "h2nod", i, -1, 548 hammer2_primary_sync_thread); 549 } 550 } 551 552 /* 553 * Create missing Xop threads 554 * 555 * NOTE: We create helper threads for all mounted PFSs or any 556 * PFSs with 2+ nodes (so the sync thread can update them, 557 * even if not mounted). 558 */ 559 if (pmp->mp || iroot->cluster.nchains >= 2) 560 hammer2_xop_helper_create(pmp); 561 562 hammer2_mtx_unlock(&iroot->lock); 563 hammer2_inode_drop(iroot); 564 done: 565 return pmp; 566 } 567 568 /* 569 * Deallocate an element of a probed PFS. If destroying and this is a 570 * MASTER, adjust nmasters. 571 * 572 * This function does not physically destroy the PFS element in its device 573 * under the super-root (see hammer2_ioctl_pfs_delete()). 574 */ 575 void 576 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 577 { 578 hammer2_inode_t *iroot; 579 hammer2_chain_t *chain; 580 int j; 581 582 /* 583 * Cleanup our reference on iroot. iroot is (should) not be needed 584 * by the flush code. 585 */ 586 iroot = pmp->iroot; 587 if (iroot) { 588 /* 589 * Stop synchronizing 590 * 591 * XXX flush after acquiring the iroot lock. 592 * XXX clean out the cluster index from all inode structures. 593 */ 594 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 595 596 /* 597 * Remove the cluster index from the group. If destroying 598 * the PFS and this is a master, adjust pfs_nmasters. 599 */ 600 hammer2_mtx_ex(&iroot->lock); 601 chain = iroot->cluster.array[clindex].chain; 602 iroot->cluster.array[clindex].chain = NULL; 603 604 switch(pmp->pfs_types[clindex]) { 605 case HAMMER2_PFSTYPE_MASTER: 606 if (destroying && pmp->pfs_nmasters > 0) 607 --pmp->pfs_nmasters; 608 /* XXX adjust ripdata->meta.pfs_nmasters */ 609 break; 610 default: 611 break; 612 } 613 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 614 615 hammer2_mtx_unlock(&iroot->lock); 616 617 /* 618 * Release the chain. 619 */ 620 if (chain) { 621 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 622 hammer2_chain_drop(chain); 623 } 624 625 /* 626 * Terminate all XOP threads for the cluster index. 627 */ 628 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 629 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]); 630 } 631 } 632 633 /* 634 * Destroy a PFS, typically only occurs after the last mount on a device 635 * has gone away. 636 */ 637 static void 638 hammer2_pfsfree(hammer2_pfs_t *pmp) 639 { 640 hammer2_inode_t *iroot; 641 hammer2_chain_t *chain; 642 int i; 643 int j; 644 645 /* 646 * Cleanup our reference on iroot. iroot is (should) not be needed 647 * by the flush code. 648 */ 649 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 650 651 iroot = pmp->iroot; 652 if (iroot) { 653 for (i = 0; i < iroot->cluster.nchains; ++i) { 654 hammer2_thr_delete(&pmp->sync_thrs[i]); 655 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 656 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 657 } 658 #if REPORT_REFS_ERRORS 659 if (pmp->iroot->refs != 1) 660 kprintf("PMP->IROOT %p REFS WRONG %d\n", 661 pmp->iroot, pmp->iroot->refs); 662 #else 663 KKASSERT(pmp->iroot->refs == 1); 664 #endif 665 /* ref for pmp->iroot */ 666 hammer2_inode_drop(pmp->iroot); 667 pmp->iroot = NULL; 668 } 669 670 /* 671 * Cleanup chains remaining on LRU list. 672 */ 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 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 709 hammer2_inode_run_sideq(pmp, 1); 710 hammer2_bioq_sync(pmp); 711 hammer2_trans_done(pmp); 712 if (hmp->spmp == pmp) { 713 hmp->spmp = NULL; 714 hmp->vchain.pmp = NULL; 715 hmp->fchain.pmp = NULL; 716 } 717 718 /* 719 * Determine if this PFS is affected. If it is we must 720 * freeze all management threads and lock its iroot. 721 * 722 * Freezing a management thread forces it idle, operations 723 * in-progress will be aborted and it will have to start 724 * over again when unfrozen, or exit if told to exit. 725 */ 726 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 727 if (pmp->pfs_hmps[i] == hmp) 728 break; 729 } 730 if (i != HAMMER2_MAXCLUSTER) { 731 /* 732 * Make sure all synchronization threads are locked 733 * down. 734 */ 735 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 736 if (pmp->pfs_hmps[i] == NULL) 737 continue; 738 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 739 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 740 hammer2_thr_freeze_async( 741 &pmp->xop_groups[j].thrs[i]); 742 } 743 } 744 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 745 if (pmp->pfs_hmps[i] == NULL) 746 continue; 747 hammer2_thr_freeze(&pmp->sync_thrs[i]); 748 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 749 hammer2_thr_freeze( 750 &pmp->xop_groups[j].thrs[i]); 751 } 752 } 753 754 /* 755 * Lock the inode and clean out matching chains. 756 * Note that we cannot use hammer2_inode_lock_*() 757 * here because that would attempt to validate the 758 * cluster that we are in the middle of ripping 759 * apart. 760 * 761 * WARNING! We are working directly on the inodes 762 * embedded cluster. 763 */ 764 hammer2_mtx_ex(&iroot->lock); 765 766 /* 767 * Remove the chain from matching elements of the PFS. 768 */ 769 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 770 if (pmp->pfs_hmps[i] != hmp) 771 continue; 772 hammer2_thr_delete(&pmp->sync_thrs[i]); 773 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 774 hammer2_thr_delete( 775 &pmp->xop_groups[j].thrs[i]); 776 } 777 rchain = iroot->cluster.array[i].chain; 778 iroot->cluster.array[i].chain = NULL; 779 pmp->pfs_types[i] = 0; 780 if (pmp->pfs_names[i]) { 781 kfree(pmp->pfs_names[i], M_HAMMER2); 782 pmp->pfs_names[i] = NULL; 783 } 784 if (rchain) { 785 hammer2_chain_drop(rchain); 786 /* focus hint */ 787 if (iroot->cluster.focus == rchain) 788 iroot->cluster.focus = NULL; 789 } 790 pmp->pfs_hmps[i] = NULL; 791 } 792 hammer2_mtx_unlock(&iroot->lock); 793 didfreeze = 1; /* remaster, unfreeze down below */ 794 } else { 795 didfreeze = 0; 796 } 797 798 /* 799 * Cleanup trailing chains. Gaps may remain. 800 */ 801 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 802 if (pmp->pfs_hmps[i]) 803 break; 804 } 805 iroot->cluster.nchains = i + 1; 806 807 /* 808 * If the PMP has no elements remaining we can destroy it. 809 * (this will transition management threads from frozen->exit). 810 */ 811 if (iroot->cluster.nchains == 0) { 812 hammer2_pfsfree(pmp); 813 goto again; 814 } 815 816 /* 817 * If elements still remain we need to set the REMASTER 818 * flag and unfreeze it. 819 */ 820 if (didfreeze) { 821 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 822 if (pmp->pfs_hmps[i] == NULL) 823 continue; 824 hammer2_thr_remaster(&pmp->sync_thrs[i]); 825 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 826 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 827 hammer2_thr_remaster( 828 &pmp->xop_groups[j].thrs[i]); 829 hammer2_thr_unfreeze( 830 &pmp->xop_groups[j].thrs[i]); 831 } 832 } 833 } 834 } 835 } 836 837 /* 838 * Mount or remount HAMMER2 fileystem from physical media 839 * 840 * mountroot 841 * mp mount point structure 842 * path NULL 843 * data <unused> 844 * cred <unused> 845 * 846 * mount 847 * mp mount point structure 848 * path path to mount point 849 * data pointer to argument structure in user space 850 * volume volume path (device@LABEL form) 851 * hflags user mount flags 852 * cred user credentials 853 * 854 * RETURNS: 0 Success 855 * !0 error number 856 */ 857 static 858 int 859 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 860 struct ucred *cred) 861 { 862 struct hammer2_mount_info info; 863 hammer2_pfs_t *pmp; 864 hammer2_pfs_t *spmp; 865 hammer2_dev_t *hmp; 866 hammer2_dev_t *force_local; 867 hammer2_key_t key_next; 868 hammer2_key_t key_dummy; 869 hammer2_key_t lhc; 870 struct vnode *devvp; 871 struct nlookupdata nd; 872 hammer2_chain_t *parent; 873 hammer2_chain_t *chain; 874 hammer2_cluster_t *cluster; 875 const hammer2_inode_data_t *ripdata; 876 hammer2_blockref_t bref; 877 struct file *fp; 878 char devstr[MNAMELEN]; 879 size_t size; 880 size_t done; 881 char *dev; 882 char *label; 883 int ronly = 1; 884 int error; 885 int i; 886 887 hmp = NULL; 888 pmp = NULL; 889 dev = NULL; 890 label = NULL; 891 devvp = NULL; 892 893 kprintf("hammer2_mount\n"); 894 895 if (path == NULL) { 896 /* 897 * Root mount 898 */ 899 bzero(&info, sizeof(info)); 900 info.cluster_fd = -1; 901 ksnprintf(devstr, sizeof(devstr), "%s", 902 mp->mnt_stat.f_mntfromname); 903 kprintf("hammer2_mount: root '%s'\n", devstr); 904 } else { 905 /* 906 * Non-root mount or updating a mount 907 */ 908 error = copyin(data, &info, sizeof(info)); 909 if (error) 910 return (error); 911 912 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 913 if (error) 914 return (error); 915 } 916 917 /* 918 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA 919 * if no label specified, based on the partition id. Error out if no 920 * label or device (with partition id) is specified. This is strictly 921 * a convenience to match the default label created by newfs_hammer2, 922 * our preference is that a label always be specified. 923 * 924 * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command 925 * that does not specify a device, as long as some H2 label 926 * has already been mounted from that device. This makes 927 * mounting snapshots a lot easier. 928 */ 929 dev = devstr; 930 label = strchr(devstr, '@'); 931 if (label && ((label + 1) - dev) > done) 932 return (EINVAL); 933 if (label == NULL || label[1] == 0) { 934 char slice; 935 936 if (label == NULL) 937 label = devstr + strlen(devstr); 938 slice = label[-1]; 939 switch(slice) { 940 case 'a': 941 label = "BOOT"; 942 break; 943 case 'd': 944 label = "ROOT"; 945 break; 946 default: 947 label = "DATA"; 948 break; 949 } 950 } else { 951 *label = '\0'; 952 label++; 953 } 954 955 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n", 956 dev, label, (mp->mnt_flag & MNT_RDONLY)); 957 958 if (mp->mnt_flag & MNT_UPDATE) { 959 /* 960 * Update mount. Note that pmp->iroot->cluster is 961 * an inode-embedded cluster and thus cannot be 962 * directly locked. 963 * 964 * XXX HAMMER2 needs to implement NFS export via 965 * mountctl. 966 */ 967 pmp = MPTOPMP(mp); 968 pmp->hflags = info.hflags; 969 cluster = &pmp->iroot->cluster; 970 for (i = 0; i < cluster->nchains; ++i) { 971 if (cluster->array[i].chain == NULL) 972 continue; 973 hmp = cluster->array[i].chain->hmp; 974 devvp = hmp->devvp; 975 error = hammer2_remount(hmp, mp, path, 976 devvp, cred); 977 if (error) 978 break; 979 } 980 981 return error; 982 } 983 984 /* 985 * HMP device mount 986 * 987 * If a path is specified and dev is not an empty string, lookup the 988 * name and verify that it referes to a block device. 989 * 990 * If a path is specified and dev is an empty string we fall through 991 * and locate the label in the hmp search. 992 */ 993 if (path && *dev != 0) { 994 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 995 if (error == 0) 996 error = nlookup(&nd); 997 if (error == 0) 998 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 999 nlookup_done(&nd); 1000 } else if (path == NULL) { 1001 /* root mount */ 1002 cdev_t cdev = kgetdiskbyname(dev); 1003 error = bdevvp(cdev, &devvp); 1004 if (error) 1005 kprintf("hammer2: cannot find '%s'\n", dev); 1006 } else { 1007 /* 1008 * We will locate the hmp using the label in the hmp loop. 1009 */ 1010 error = 0; 1011 } 1012 1013 /* 1014 * Make sure its a block device. Do not check to see if it is 1015 * already mounted until we determine that its a fresh H2 device. 1016 */ 1017 if (error == 0 && devvp) { 1018 vn_isdisk(devvp, &error); 1019 } 1020 1021 /* 1022 * Determine if the device has already been mounted. After this 1023 * check hmp will be non-NULL if we are doing the second or more 1024 * hammer2 mounts from the same device. 1025 */ 1026 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1027 if (devvp) { 1028 /* 1029 * Match the device. Due to the way devfs works, 1030 * we may not be able to directly match the vnode pointer, 1031 * so also check to see if the underlying device matches. 1032 */ 1033 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1034 if (hmp->devvp == devvp) 1035 break; 1036 if (devvp->v_rdev && 1037 hmp->devvp->v_rdev == devvp->v_rdev) { 1038 break; 1039 } 1040 } 1041 1042 /* 1043 * If no match this may be a fresh H2 mount, make sure 1044 * the device is not mounted on anything else. 1045 */ 1046 if (hmp == NULL) 1047 error = vfs_mountedon(devvp); 1048 } else if (error == 0) { 1049 /* 1050 * Match the label to a pmp already probed. 1051 */ 1052 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 1053 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 1054 if (pmp->pfs_names[i] && 1055 strcmp(pmp->pfs_names[i], label) == 0) { 1056 hmp = pmp->pfs_hmps[i]; 1057 break; 1058 } 1059 } 1060 if (hmp) 1061 break; 1062 } 1063 if (hmp == NULL) 1064 error = ENOENT; 1065 } 1066 1067 /* 1068 * Open the device if this isn't a secondary mount and construct 1069 * the H2 device mount (hmp). 1070 */ 1071 if (hmp == NULL) { 1072 hammer2_chain_t *schain; 1073 hammer2_xid_t xid; 1074 1075 if (error == 0 && vcount(devvp) > 0) { 1076 kprintf("Primary device already has references\n"); 1077 error = EBUSY; 1078 } 1079 1080 /* 1081 * Now open the device 1082 */ 1083 if (error == 0) { 1084 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1085 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1086 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1087 if (error == 0) { 1088 error = VOP_OPEN(devvp, 1089 (ronly ? FREAD : FREAD | FWRITE), 1090 FSCRED, NULL); 1091 } 1092 vn_unlock(devvp); 1093 } 1094 if (error && devvp) { 1095 vrele(devvp); 1096 devvp = NULL; 1097 } 1098 if (error) { 1099 lockmgr(&hammer2_mntlk, LK_RELEASE); 1100 return error; 1101 } 1102 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1103 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1104 hmp->ronly = ronly; 1105 hmp->devvp = devvp; 1106 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1107 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1108 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1109 RB_INIT(&hmp->iotree); 1110 spin_init(&hmp->io_spin, "hm2mount_io"); 1111 spin_init(&hmp->list_spin, "hm2mount_list"); 1112 TAILQ_INIT(&hmp->flushq); 1113 1114 lockinit(&hmp->vollk, "h2vol", 0, 0); 1115 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1116 lockinit(&hmp->bflock, "h2bflk", 0, 0); 1117 1118 /* 1119 * vchain setup. vchain.data is embedded. 1120 * vchain.refs is initialized and will never drop to 0. 1121 * 1122 * NOTE! voldata is not yet loaded. 1123 */ 1124 hmp->vchain.hmp = hmp; 1125 hmp->vchain.refs = 1; 1126 hmp->vchain.data = (void *)&hmp->voldata; 1127 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1128 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1129 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1130 1131 hammer2_chain_core_init(&hmp->vchain); 1132 /* hmp->vchain.u.xxx is left NULL */ 1133 1134 /* 1135 * fchain setup. fchain.data is embedded. 1136 * fchain.refs is initialized and will never drop to 0. 1137 * 1138 * The data is not used but needs to be initialized to 1139 * pass assertion muster. We use this chain primarily 1140 * as a placeholder for the freemap's top-level RBTREE 1141 * so it does not interfere with the volume's topology 1142 * RBTREE. 1143 */ 1144 hmp->fchain.hmp = hmp; 1145 hmp->fchain.refs = 1; 1146 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1147 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1148 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1149 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1150 hmp->fchain.bref.methods = 1151 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1152 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1153 1154 hammer2_chain_core_init(&hmp->fchain); 1155 /* hmp->fchain.u.xxx is left NULL */ 1156 1157 /* 1158 * Install the volume header and initialize fields from 1159 * voldata. 1160 */ 1161 error = hammer2_install_volume_header(hmp); 1162 if (error) { 1163 hammer2_unmount_helper(mp, NULL, hmp); 1164 lockmgr(&hammer2_mntlk, LK_RELEASE); 1165 hammer2_vfs_unmount(mp, MNT_FORCE); 1166 return error; 1167 } 1168 1169 /* 1170 * Really important to get these right or flush will get 1171 * confused. 1172 */ 1173 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1174 kprintf("alloc spmp %p tid %016jx\n", 1175 hmp->spmp, hmp->voldata.mirror_tid); 1176 spmp = hmp->spmp; 1177 1178 /* 1179 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1180 * is inherited from the volume header. 1181 */ 1182 xid = 0; 1183 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1184 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1185 hmp->vchain.pmp = spmp; 1186 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1187 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1188 hmp->fchain.pmp = spmp; 1189 1190 /* 1191 * First locate the super-root inode, which is key 0 1192 * relative to the volume header's blockset. 1193 * 1194 * Then locate the root inode by scanning the directory keyspace 1195 * represented by the label. 1196 */ 1197 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1198 schain = hammer2_chain_lookup(&parent, &key_dummy, 1199 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1200 &error, 0); 1201 hammer2_chain_lookup_done(parent); 1202 if (schain == NULL) { 1203 kprintf("hammer2_mount: invalid super-root\n"); 1204 hammer2_unmount_helper(mp, NULL, hmp); 1205 lockmgr(&hammer2_mntlk, LK_RELEASE); 1206 hammer2_vfs_unmount(mp, MNT_FORCE); 1207 return EINVAL; 1208 } 1209 if (schain->error) { 1210 kprintf("hammer2_mount: error %s reading super-root\n", 1211 hammer2_error_str(schain->error)); 1212 hammer2_chain_unlock(schain); 1213 hammer2_chain_drop(schain); 1214 schain = NULL; 1215 hammer2_unmount_helper(mp, NULL, hmp); 1216 lockmgr(&hammer2_mntlk, LK_RELEASE); 1217 hammer2_vfs_unmount(mp, MNT_FORCE); 1218 return EINVAL; 1219 } 1220 1221 /* 1222 * The super-root always uses an inode_tid of 1 when 1223 * creating PFSs. 1224 */ 1225 spmp->inode_tid = 1; 1226 spmp->modify_tid = schain->bref.modify_tid + 1; 1227 1228 /* 1229 * Sanity-check schain's pmp and finish initialization. 1230 * Any chain belonging to the super-root topology should 1231 * have a NULL pmp (not even set to spmp). 1232 */ 1233 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1234 KKASSERT(schain->pmp == NULL); 1235 spmp->pfs_clid = ripdata->meta.pfs_clid; 1236 1237 /* 1238 * Replace the dummy spmp->iroot with a real one. It's 1239 * easier to just do a wholesale replacement than to try 1240 * to update the chain and fixup the iroot fields. 1241 * 1242 * The returned inode is locked with the supplied cluster. 1243 */ 1244 cluster = hammer2_cluster_from_chain(schain); 1245 hammer2_inode_drop(spmp->iroot); 1246 spmp->iroot = NULL; 1247 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1); 1248 spmp->spmp_hmp = hmp; 1249 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1250 spmp->pfs_hmps[0] = hmp; 1251 hammer2_inode_ref(spmp->iroot); 1252 hammer2_inode_unlock(spmp->iroot); 1253 hammer2_cluster_unlock(cluster); 1254 hammer2_cluster_drop(cluster); 1255 schain = NULL; 1256 /* leave spmp->iroot with one ref */ 1257 1258 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1259 error = hammer2_recovery(hmp); 1260 /* XXX do something with error */ 1261 } 1262 hammer2_update_pmps(hmp); 1263 hammer2_iocom_init(hmp); 1264 hammer2_bulkfree_init(hmp); 1265 1266 /* 1267 * Ref the cluster management messaging descriptor. The mount 1268 * program deals with the other end of the communications pipe. 1269 * 1270 * Root mounts typically do not supply one. 1271 */ 1272 if (info.cluster_fd >= 0) { 1273 fp = holdfp(curproc->p_fd, info.cluster_fd, -1); 1274 if (fp) { 1275 hammer2_cluster_reconnect(hmp, fp); 1276 } else { 1277 kprintf("hammer2_mount: bad cluster_fd!\n"); 1278 } 1279 } 1280 } else { 1281 spmp = hmp->spmp; 1282 if (info.hflags & HMNT2_DEVFLAGS) { 1283 kprintf("hammer2: Warning: mount flags pertaining " 1284 "to the whole device may only be specified " 1285 "on the first mount of the device: %08x\n", 1286 info.hflags & HMNT2_DEVFLAGS); 1287 } 1288 } 1289 1290 /* 1291 * Force local mount (disassociate all PFSs from their clusters). 1292 * Used primarily for debugging. 1293 */ 1294 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1295 1296 /* 1297 * Lookup the mount point under the media-localized super-root. 1298 * Scanning hammer2_pfslist doesn't help us because it represents 1299 * PFS cluster ids which can aggregate several named PFSs together. 1300 * 1301 * cluster->pmp will incorrectly point to spmp and must be fixed 1302 * up later on. 1303 */ 1304 hammer2_inode_lock(spmp->iroot, 0); 1305 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1306 lhc = hammer2_dirhash(label, strlen(label)); 1307 chain = hammer2_chain_lookup(&parent, &key_next, 1308 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1309 &error, 0); 1310 while (chain) { 1311 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1312 strcmp(label, chain->data->ipdata.filename) == 0) { 1313 break; 1314 } 1315 chain = hammer2_chain_next(&parent, chain, &key_next, 1316 key_next, 1317 lhc + HAMMER2_DIRHASH_LOMASK, 1318 &error, 0); 1319 } 1320 if (parent) { 1321 hammer2_chain_unlock(parent); 1322 hammer2_chain_drop(parent); 1323 } 1324 hammer2_inode_unlock(spmp->iroot); 1325 1326 /* 1327 * PFS could not be found? 1328 */ 1329 if (chain == NULL) { 1330 if (error) 1331 kprintf("hammer2_mount: PFS label I/O error\n"); 1332 else 1333 kprintf("hammer2_mount: PFS label not found\n"); 1334 hammer2_unmount_helper(mp, NULL, hmp); 1335 lockmgr(&hammer2_mntlk, LK_RELEASE); 1336 hammer2_vfs_unmount(mp, MNT_FORCE); 1337 1338 return EINVAL; 1339 } 1340 1341 /* 1342 * Acquire the pmp structure (it should have already been allocated 1343 * via hammer2_update_pmps() so do not pass cluster in to add to 1344 * available chains). 1345 * 1346 * Check if the cluster has already been mounted. A cluster can 1347 * only be mounted once, use null mounts to mount additional copies. 1348 */ 1349 if (chain->error) { 1350 kprintf("hammer2_mount: PFS label I/O error\n"); 1351 } else { 1352 ripdata = &chain->data->ipdata; 1353 bref = chain->bref; 1354 pmp = hammer2_pfsalloc(NULL, ripdata, 1355 bref.modify_tid, force_local); 1356 } 1357 hammer2_chain_unlock(chain); 1358 hammer2_chain_drop(chain); 1359 1360 /* 1361 * Finish the mount 1362 */ 1363 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1364 1365 if (pmp->mp) { 1366 kprintf("hammer2_mount: PFS already mounted!\n"); 1367 hammer2_unmount_helper(mp, NULL, hmp); 1368 lockmgr(&hammer2_mntlk, LK_RELEASE); 1369 hammer2_vfs_unmount(mp, MNT_FORCE); 1370 1371 return EBUSY; 1372 } 1373 1374 pmp->hflags = info.hflags; 1375 mp->mnt_flag |= MNT_LOCAL; 1376 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1377 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1378 1379 /* 1380 * required mount structure initializations 1381 */ 1382 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1383 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1384 1385 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1386 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1387 1388 /* 1389 * Optional fields 1390 */ 1391 mp->mnt_iosize_max = MAXPHYS; 1392 1393 /* 1394 * Connect up mount pointers. 1395 */ 1396 hammer2_mount_helper(mp, pmp); 1397 1398 lockmgr(&hammer2_mntlk, LK_RELEASE); 1399 1400 /* 1401 * Finish setup 1402 */ 1403 vfs_getnewfsid(mp); 1404 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1405 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1406 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1407 1408 if (path) { 1409 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1410 MNAMELEN - 1, &size); 1411 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1412 } /* else root mount, already in there */ 1413 1414 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1415 if (path) { 1416 copyinstr(path, mp->mnt_stat.f_mntonname, 1417 sizeof(mp->mnt_stat.f_mntonname) - 1, 1418 &size); 1419 } else { 1420 /* root mount */ 1421 mp->mnt_stat.f_mntonname[0] = '/'; 1422 } 1423 1424 /* 1425 * Initial statfs to prime mnt_stat. 1426 */ 1427 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1428 1429 return 0; 1430 } 1431 1432 /* 1433 * Scan PFSs under the super-root and create hammer2_pfs structures. 1434 */ 1435 static 1436 void 1437 hammer2_update_pmps(hammer2_dev_t *hmp) 1438 { 1439 const hammer2_inode_data_t *ripdata; 1440 hammer2_chain_t *parent; 1441 hammer2_chain_t *chain; 1442 hammer2_blockref_t bref; 1443 hammer2_dev_t *force_local; 1444 hammer2_pfs_t *spmp; 1445 hammer2_pfs_t *pmp; 1446 hammer2_key_t key_next; 1447 int error; 1448 1449 /* 1450 * Force local mount (disassociate all PFSs from their clusters). 1451 * Used primarily for debugging. 1452 */ 1453 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1454 1455 /* 1456 * Lookup mount point under the media-localized super-root. 1457 * 1458 * cluster->pmp will incorrectly point to spmp and must be fixed 1459 * up later on. 1460 */ 1461 spmp = hmp->spmp; 1462 hammer2_inode_lock(spmp->iroot, 0); 1463 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1464 chain = hammer2_chain_lookup(&parent, &key_next, 1465 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1466 &error, 0); 1467 while (chain) { 1468 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1469 continue; 1470 if (chain->error) { 1471 kprintf("I/O error scanning PFS labels\n"); 1472 } else { 1473 ripdata = &chain->data->ipdata; 1474 bref = chain->bref; 1475 1476 pmp = hammer2_pfsalloc(chain, ripdata, 1477 bref.modify_tid, force_local); 1478 } 1479 chain = hammer2_chain_next(&parent, chain, &key_next, 1480 key_next, HAMMER2_KEY_MAX, 1481 &error, 0); 1482 } 1483 if (parent) { 1484 hammer2_chain_unlock(parent); 1485 hammer2_chain_drop(parent); 1486 } 1487 hammer2_inode_unlock(spmp->iroot); 1488 } 1489 1490 static 1491 int 1492 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1493 struct vnode *devvp, struct ucred *cred) 1494 { 1495 int error; 1496 1497 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1498 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1499 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL); 1500 vn_unlock(devvp); 1501 error = hammer2_recovery(hmp); 1502 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1503 if (error == 0) { 1504 VOP_CLOSE(devvp, FREAD, NULL); 1505 hmp->ronly = 0; 1506 } else { 1507 VOP_CLOSE(devvp, FREAD | FWRITE, NULL); 1508 } 1509 vn_unlock(devvp); 1510 } else { 1511 error = 0; 1512 } 1513 return error; 1514 } 1515 1516 static 1517 int 1518 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1519 { 1520 hammer2_pfs_t *pmp; 1521 int flags; 1522 int error = 0; 1523 1524 pmp = MPTOPMP(mp); 1525 1526 if (pmp == NULL) 1527 return(0); 1528 1529 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1530 1531 /* 1532 * If mount initialization proceeded far enough we must flush 1533 * its vnodes and sync the underlying mount points. Three syncs 1534 * are required to fully flush the filesystem (freemap updates lag 1535 * by one flush, and one extra for safety). 1536 */ 1537 if (mntflags & MNT_FORCE) 1538 flags = FORCECLOSE; 1539 else 1540 flags = 0; 1541 if (pmp->iroot) { 1542 error = vflush(mp, 0, flags); 1543 if (error) 1544 goto failed; 1545 hammer2_vfs_sync(mp, MNT_WAIT); 1546 hammer2_vfs_sync(mp, MNT_WAIT); 1547 hammer2_vfs_sync(mp, MNT_WAIT); 1548 } 1549 1550 /* 1551 * Cleanup the frontend support XOPS threads 1552 */ 1553 hammer2_xop_helper_cleanup(pmp); 1554 1555 if (pmp->mp) 1556 hammer2_unmount_helper(mp, pmp, NULL); 1557 1558 error = 0; 1559 failed: 1560 lockmgr(&hammer2_mntlk, LK_RELEASE); 1561 1562 return (error); 1563 } 1564 1565 /* 1566 * Mount helper, hook the system mount into our PFS. 1567 * The mount lock is held. 1568 * 1569 * We must bump the mount_count on related devices for any 1570 * mounted PFSs. 1571 */ 1572 static 1573 void 1574 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1575 { 1576 hammer2_cluster_t *cluster; 1577 hammer2_chain_t *rchain; 1578 int i; 1579 1580 mp->mnt_data = (qaddr_t)pmp; 1581 pmp->mp = mp; 1582 1583 /* 1584 * After pmp->mp is set we have to adjust hmp->mount_count. 1585 */ 1586 cluster = &pmp->iroot->cluster; 1587 for (i = 0; i < cluster->nchains; ++i) { 1588 rchain = cluster->array[i].chain; 1589 if (rchain == NULL) 1590 continue; 1591 ++rchain->hmp->mount_count; 1592 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n", 1593 rchain->hmp, rchain->hmp->mount_count); 1594 } 1595 1596 /* 1597 * Create missing Xop threads 1598 */ 1599 hammer2_xop_helper_create(pmp); 1600 } 1601 1602 /* 1603 * Mount helper, unhook the system mount from our PFS. 1604 * The mount lock is held. 1605 * 1606 * If hmp is supplied a mount responsible for being the first to open 1607 * the block device failed and the block device and all PFSs using the 1608 * block device must be cleaned up. 1609 * 1610 * If pmp is supplied multiple devices might be backing the PFS and each 1611 * must be disconnected. This might not be the last PFS using some of the 1612 * underlying devices. Also, we have to adjust our hmp->mount_count 1613 * accounting for the devices backing the pmp which is now undergoing an 1614 * unmount. 1615 */ 1616 static 1617 void 1618 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1619 { 1620 hammer2_cluster_t *cluster; 1621 hammer2_chain_t *rchain; 1622 struct vnode *devvp; 1623 int dumpcnt; 1624 int ronly; 1625 int i; 1626 1627 /* 1628 * If no device supplied this is a high-level unmount and we have to 1629 * to disconnect the mount, adjust mount_count, and locate devices 1630 * that might now have no mounts. 1631 */ 1632 if (pmp) { 1633 KKASSERT(hmp == NULL); 1634 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1635 pmp->mp = NULL; 1636 mp->mnt_data = NULL; 1637 1638 /* 1639 * After pmp->mp is cleared we have to account for 1640 * mount_count. 1641 */ 1642 cluster = &pmp->iroot->cluster; 1643 for (i = 0; i < cluster->nchains; ++i) { 1644 rchain = cluster->array[i].chain; 1645 if (rchain == NULL) 1646 continue; 1647 --rchain->hmp->mount_count; 1648 /* scrapping hmp now may invalidate the pmp */ 1649 } 1650 again: 1651 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1652 if (hmp->mount_count == 0) { 1653 hammer2_unmount_helper(NULL, NULL, hmp); 1654 goto again; 1655 } 1656 } 1657 return; 1658 } 1659 1660 /* 1661 * Try to terminate the block device. We can't terminate it if 1662 * there are still PFSs referencing it. 1663 */ 1664 if (hmp->mount_count) 1665 return; 1666 1667 /* 1668 * Decomission the network before we start messing with the 1669 * device and PFS. 1670 */ 1671 hammer2_iocom_uninit(hmp); 1672 1673 hammer2_bulkfree_uninit(hmp); 1674 hammer2_pfsfree_scan(hmp); 1675 hammer2_dev_exlock(hmp); /* XXX order */ 1676 1677 /* 1678 * Cycle the volume data lock as a safety (probably not needed any 1679 * more). To ensure everything is out we need to flush at least 1680 * three times. (1) The running of the sideq can dirty the 1681 * filesystem, (2) A normal flush can dirty the freemap, and 1682 * (3) ensure that the freemap is fully synchronized. 1683 * 1684 * The next mount's recovery scan can clean everything up but we want 1685 * to leave the filesystem in a 100% clean state on a normal unmount. 1686 */ 1687 #if 0 1688 hammer2_voldata_lock(hmp); 1689 hammer2_voldata_unlock(hmp); 1690 #endif 1691 1692 /* 1693 * Flush whatever is left. Unmounted but modified PFS's might still 1694 * have some dirty chains on them. 1695 */ 1696 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS); 1697 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS); 1698 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP | HAMMER2_FLUSH_ALL); 1699 hammer2_chain_unlock(&hmp->fchain); 1700 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP | HAMMER2_FLUSH_ALL); 1701 hammer2_chain_unlock(&hmp->vchain); 1702 1703 if ((hmp->vchain.flags | hmp->fchain.flags) & 1704 HAMMER2_CHAIN_FLUSH_MASK) { 1705 kprintf("hammer2_unmount: chains left over " 1706 "after final sync\n"); 1707 kprintf(" vchain %08x\n", hmp->vchain.flags); 1708 kprintf(" fchain %08x\n", hmp->fchain.flags); 1709 1710 if (hammer2_debug & 0x0010) 1711 Debugger("entered debugger"); 1712 } 1713 1714 KKASSERT(hmp->spmp == NULL); 1715 1716 /* 1717 * Finish up with the device vnode 1718 */ 1719 if ((devvp = hmp->devvp) != NULL) { 1720 ronly = hmp->ronly; 1721 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1722 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n", 1723 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree), 1724 ronly); 1725 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1726 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n", 1727 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree)); 1728 hmp->devvp = NULL; 1729 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1730 vn_unlock(devvp); 1731 vrele(devvp); 1732 devvp = NULL; 1733 } 1734 1735 /* 1736 * Clear vchain/fchain flags that might prevent final cleanup 1737 * of these chains. 1738 */ 1739 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1740 atomic_add_long(&hammer2_count_modified_chains, -1); 1741 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1742 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1743 } 1744 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1745 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1746 } 1747 1748 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1749 atomic_add_long(&hammer2_count_modified_chains, -1); 1750 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1751 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1752 } 1753 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1754 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1755 } 1756 1757 /* 1758 * Final drop of embedded freemap root chain to 1759 * clean up fchain.core (fchain structure is not 1760 * flagged ALLOCATED so it is cleaned out and then 1761 * left to rot). 1762 */ 1763 hammer2_chain_drop(&hmp->fchain); 1764 1765 /* 1766 * Final drop of embedded volume root chain to clean 1767 * up vchain.core (vchain structure is not flagged 1768 * ALLOCATED so it is cleaned out and then left to 1769 * rot). 1770 */ 1771 dumpcnt = 50; 1772 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v'); 1773 dumpcnt = 50; 1774 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f'); 1775 hammer2_dev_unlock(hmp); 1776 hammer2_chain_drop(&hmp->vchain); 1777 1778 hammer2_io_cleanup(hmp, &hmp->iotree); 1779 if (hmp->iofree_count) { 1780 kprintf("io_cleanup: %d I/O's left hanging\n", 1781 hmp->iofree_count); 1782 } 1783 1784 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1785 kmalloc_destroy(&hmp->mchain); 1786 kfree(hmp, M_HAMMER2); 1787 } 1788 1789 int 1790 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1791 ino_t ino, struct vnode **vpp) 1792 { 1793 hammer2_xop_lookup_t *xop; 1794 hammer2_pfs_t *pmp; 1795 hammer2_inode_t *ip; 1796 hammer2_tid_t inum; 1797 int error; 1798 1799 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1800 1801 error = 0; 1802 pmp = MPTOPMP(mp); 1803 1804 /* 1805 * Easy if we already have it cached 1806 */ 1807 ip = hammer2_inode_lookup(pmp, inum); 1808 if (ip) { 1809 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1810 *vpp = hammer2_igetv(ip, &error); 1811 hammer2_inode_unlock(ip); 1812 hammer2_inode_drop(ip); /* from lookup */ 1813 1814 return error; 1815 } 1816 1817 /* 1818 * Otherwise we have to find the inode 1819 */ 1820 xop = hammer2_xop_alloc(pmp->iroot, 0); 1821 xop->lhc = inum; 1822 hammer2_xop_start(&xop->head, hammer2_xop_lookup); 1823 error = hammer2_xop_collect(&xop->head, 0); 1824 1825 if (error == 0) { 1826 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) { 1827 kprintf("vget: no collect error but also no rdata\n"); 1828 kprintf("xop %p\n", xop); 1829 while ((hammer2_debug & 0x80000) == 0) { 1830 tsleep(xop, PCATCH, "wait", hz * 10); 1831 } 1832 ip = NULL; 1833 } else { 1834 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1); 1835 } 1836 } 1837 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1838 1839 if (ip) { 1840 *vpp = hammer2_igetv(ip, &error); 1841 hammer2_inode_unlock(ip); 1842 } else { 1843 *vpp = NULL; 1844 error = ENOENT; 1845 } 1846 return (error); 1847 } 1848 1849 static 1850 int 1851 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1852 { 1853 hammer2_pfs_t *pmp; 1854 struct vnode *vp; 1855 int error; 1856 1857 pmp = MPTOPMP(mp); 1858 if (pmp->iroot == NULL) { 1859 *vpp = NULL; 1860 return EINVAL; 1861 } 1862 1863 error = 0; 1864 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1865 1866 while (pmp->inode_tid == 0) { 1867 hammer2_xop_ipcluster_t *xop; 1868 hammer2_inode_meta_t *meta; 1869 1870 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1871 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster); 1872 error = hammer2_xop_collect(&xop->head, 0); 1873 1874 if (error == 0) { 1875 meta = &xop->head.cluster.focus->data->ipdata.meta; 1876 pmp->iroot->meta = *meta; 1877 pmp->inode_tid = meta->pfs_inum + 1; 1878 if (pmp->inode_tid < HAMMER2_INODE_START) 1879 pmp->inode_tid = HAMMER2_INODE_START; 1880 pmp->modify_tid = 1881 xop->head.cluster.focus->bref.modify_tid + 1; 1882 kprintf("PFS: Starting inode %jd\n", 1883 (intmax_t)pmp->inode_tid); 1884 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1885 pmp->inode_tid, pmp->modify_tid); 1886 wakeup(&pmp->iroot); 1887 1888 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1889 1890 /* 1891 * Prime the mount info. 1892 */ 1893 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1894 break; 1895 } 1896 1897 /* 1898 * Loop, try again 1899 */ 1900 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1901 hammer2_inode_unlock(pmp->iroot); 1902 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1903 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1904 if (error == EINTR) 1905 break; 1906 } 1907 1908 if (error) { 1909 hammer2_inode_unlock(pmp->iroot); 1910 *vpp = NULL; 1911 } else { 1912 vp = hammer2_igetv(pmp->iroot, &error); 1913 hammer2_inode_unlock(pmp->iroot); 1914 *vpp = vp; 1915 } 1916 1917 return (error); 1918 } 1919 1920 /* 1921 * Filesystem status 1922 * 1923 * XXX incorporate ipdata->meta.inode_quota and data_quota 1924 */ 1925 static 1926 int 1927 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 1928 { 1929 hammer2_pfs_t *pmp; 1930 hammer2_dev_t *hmp; 1931 hammer2_blockref_t bref; 1932 struct statfs tmp; 1933 int i; 1934 1935 /* 1936 * NOTE: iroot might not have validated the cluster yet. 1937 */ 1938 pmp = MPTOPMP(mp); 1939 1940 bzero(&tmp, sizeof(tmp)); 1941 1942 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1943 hmp = pmp->pfs_hmps[i]; 1944 if (hmp == NULL) 1945 continue; 1946 if (pmp->iroot->cluster.array[i].chain) 1947 bref = pmp->iroot->cluster.array[i].chain->bref; 1948 else 1949 bzero(&bref, sizeof(bref)); 1950 1951 tmp.f_files = bref.embed.stats.inode_count; 1952 tmp.f_ffree = 0; 1953 tmp.f_blocks = hmp->voldata.allocator_size / 1954 mp->mnt_vstat.f_bsize; 1955 tmp.f_bfree = hmp->voldata.allocator_free / 1956 mp->mnt_vstat.f_bsize; 1957 tmp.f_bavail = tmp.f_bfree; 1958 1959 if (cred && cred->cr_uid != 0) { 1960 uint64_t adj; 1961 1962 /* 5% */ 1963 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 1964 tmp.f_blocks -= adj; 1965 tmp.f_bfree -= adj; 1966 tmp.f_bavail -= adj; 1967 } 1968 1969 mp->mnt_stat.f_blocks = tmp.f_blocks; 1970 mp->mnt_stat.f_bfree = tmp.f_bfree; 1971 mp->mnt_stat.f_bavail = tmp.f_bavail; 1972 mp->mnt_stat.f_files = tmp.f_files; 1973 mp->mnt_stat.f_ffree = tmp.f_ffree; 1974 1975 *sbp = mp->mnt_stat; 1976 } 1977 return (0); 1978 } 1979 1980 static 1981 int 1982 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 1983 { 1984 hammer2_pfs_t *pmp; 1985 hammer2_dev_t *hmp; 1986 hammer2_blockref_t bref; 1987 struct statvfs tmp; 1988 int i; 1989 1990 /* 1991 * NOTE: iroot might not have validated the cluster yet. 1992 */ 1993 pmp = MPTOPMP(mp); 1994 bzero(&tmp, sizeof(tmp)); 1995 1996 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 1997 hmp = pmp->pfs_hmps[i]; 1998 if (hmp == NULL) 1999 continue; 2000 if (pmp->iroot->cluster.array[i].chain) 2001 bref = pmp->iroot->cluster.array[i].chain->bref; 2002 else 2003 bzero(&bref, sizeof(bref)); 2004 2005 tmp.f_files = bref.embed.stats.inode_count; 2006 tmp.f_ffree = 0; 2007 tmp.f_blocks = hmp->voldata.allocator_size / 2008 mp->mnt_vstat.f_bsize; 2009 tmp.f_bfree = hmp->voldata.allocator_free / 2010 mp->mnt_vstat.f_bsize; 2011 tmp.f_bavail = tmp.f_bfree; 2012 2013 if (cred && cred->cr_uid != 0) { 2014 uint64_t adj; 2015 2016 /* 5% */ 2017 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2018 tmp.f_blocks -= adj; 2019 tmp.f_bfree -= adj; 2020 tmp.f_bavail -= adj; 2021 } 2022 2023 mp->mnt_vstat.f_blocks = tmp.f_blocks; 2024 mp->mnt_vstat.f_bfree = tmp.f_bfree; 2025 mp->mnt_vstat.f_bavail = tmp.f_bavail; 2026 mp->mnt_vstat.f_files = tmp.f_files; 2027 mp->mnt_vstat.f_ffree = tmp.f_ffree; 2028 2029 *sbp = mp->mnt_vstat; 2030 } 2031 return (0); 2032 } 2033 2034 /* 2035 * Mount-time recovery (RW mounts) 2036 * 2037 * Updates to the free block table are allowed to lag flushes by one 2038 * transaction. In case of a crash, then on a fresh mount we must do an 2039 * incremental scan of the last committed transaction id and make sure that 2040 * all related blocks have been marked allocated. 2041 * 2042 * The super-root topology and each PFS has its own transaction id domain, 2043 * so we must track PFS boundary transitions. 2044 */ 2045 struct hammer2_recovery_elm { 2046 TAILQ_ENTRY(hammer2_recovery_elm) entry; 2047 hammer2_chain_t *chain; 2048 hammer2_tid_t sync_tid; 2049 }; 2050 2051 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 2052 2053 struct hammer2_recovery_info { 2054 struct hammer2_recovery_list list; 2055 hammer2_tid_t mtid; 2056 int depth; 2057 }; 2058 2059 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 2060 hammer2_chain_t *parent, 2061 struct hammer2_recovery_info *info, 2062 hammer2_tid_t sync_tid); 2063 2064 #define HAMMER2_RECOVERY_MAXDEPTH 10 2065 2066 static 2067 int 2068 hammer2_recovery(hammer2_dev_t *hmp) 2069 { 2070 struct hammer2_recovery_info info; 2071 struct hammer2_recovery_elm *elm; 2072 hammer2_chain_t *parent; 2073 hammer2_tid_t sync_tid; 2074 hammer2_tid_t mirror_tid; 2075 int error; 2076 2077 hammer2_trans_init(hmp->spmp, 0); 2078 2079 sync_tid = hmp->voldata.freemap_tid; 2080 mirror_tid = hmp->voldata.mirror_tid; 2081 2082 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 2083 if (sync_tid >= mirror_tid) { 2084 kprintf(" no recovery needed\n"); 2085 } else { 2086 kprintf(" freemap recovery %016jx-%016jx\n", 2087 sync_tid + 1, mirror_tid); 2088 } 2089 2090 TAILQ_INIT(&info.list); 2091 info.depth = 0; 2092 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 2093 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 2094 hammer2_chain_lookup_done(parent); 2095 2096 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 2097 TAILQ_REMOVE(&info.list, elm, entry); 2098 parent = elm->chain; 2099 sync_tid = elm->sync_tid; 2100 kfree(elm, M_HAMMER2); 2101 2102 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2103 error |= hammer2_recovery_scan(hmp, parent, &info, 2104 hmp->voldata.freemap_tid); 2105 hammer2_chain_unlock(parent); 2106 hammer2_chain_drop(parent); /* drop elm->chain ref */ 2107 } 2108 hammer2_trans_done(hmp->spmp); 2109 2110 return error; 2111 } 2112 2113 static 2114 int 2115 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 2116 struct hammer2_recovery_info *info, 2117 hammer2_tid_t sync_tid) 2118 { 2119 const hammer2_inode_data_t *ripdata; 2120 hammer2_chain_t *chain; 2121 hammer2_blockref_t bref; 2122 int tmp_error; 2123 int rup_error; 2124 int error; 2125 int first; 2126 2127 /* 2128 * Adjust freemap to ensure that the block(s) are marked allocated. 2129 */ 2130 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2131 hammer2_freemap_adjust(hmp, &parent->bref, 2132 HAMMER2_FREEMAP_DORECOVER); 2133 } 2134 2135 /* 2136 * Check type for recursive scan 2137 */ 2138 switch(parent->bref.type) { 2139 case HAMMER2_BREF_TYPE_VOLUME: 2140 /* data already instantiated */ 2141 break; 2142 case HAMMER2_BREF_TYPE_INODE: 2143 /* 2144 * Must instantiate data for DIRECTDATA test and also 2145 * for recursion. 2146 */ 2147 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2148 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2149 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2150 /* not applicable to recovery scan */ 2151 hammer2_chain_unlock(parent); 2152 return 0; 2153 } 2154 hammer2_chain_unlock(parent); 2155 break; 2156 case HAMMER2_BREF_TYPE_INDIRECT: 2157 /* 2158 * Must instantiate data for recursion 2159 */ 2160 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2161 hammer2_chain_unlock(parent); 2162 break; 2163 case HAMMER2_BREF_TYPE_DIRENT: 2164 case HAMMER2_BREF_TYPE_DATA: 2165 case HAMMER2_BREF_TYPE_FREEMAP: 2166 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2167 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2168 /* not applicable to recovery scan */ 2169 return 0; 2170 break; 2171 default: 2172 return HAMMER2_ERROR_BADBREF; 2173 } 2174 2175 /* 2176 * Defer operation if depth limit reached or if we are crossing a 2177 * PFS boundary. 2178 */ 2179 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2180 struct hammer2_recovery_elm *elm; 2181 2182 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2183 elm->chain = parent; 2184 elm->sync_tid = sync_tid; 2185 hammer2_chain_ref(parent); 2186 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2187 /* unlocked by caller */ 2188 2189 return(0); 2190 } 2191 2192 2193 /* 2194 * Recursive scan of the last flushed transaction only. We are 2195 * doing this without pmp assignments so don't leave the chains 2196 * hanging around after we are done with them. 2197 * 2198 * error Cumulative error this level only 2199 * rup_error Cumulative error for recursion 2200 * tmp_error Specific non-cumulative recursion error 2201 */ 2202 chain = NULL; 2203 first = 1; 2204 rup_error = 0; 2205 error = 0; 2206 2207 for (;;) { 2208 error |= hammer2_chain_scan(parent, &chain, &bref, 2209 &first, 2210 HAMMER2_LOOKUP_NODATA); 2211 2212 /* 2213 * Problem during scan or EOF 2214 */ 2215 if (error) 2216 break; 2217 2218 /* 2219 * If this is a leaf 2220 */ 2221 if (chain == NULL) { 2222 if (bref.mirror_tid > sync_tid) { 2223 hammer2_freemap_adjust(hmp, &bref, 2224 HAMMER2_FREEMAP_DORECOVER); 2225 } 2226 continue; 2227 } 2228 2229 /* 2230 * This may or may not be a recursive node. 2231 */ 2232 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2233 if (bref.mirror_tid > sync_tid) { 2234 ++info->depth; 2235 tmp_error = hammer2_recovery_scan(hmp, chain, 2236 info, sync_tid); 2237 --info->depth; 2238 } else { 2239 tmp_error = 0; 2240 } 2241 2242 /* 2243 * Flush the recovery at the PFS boundary to stage it for 2244 * the final flush of the super-root topology. 2245 */ 2246 if (tmp_error == 0 && 2247 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2248 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2249 hammer2_flush(chain, HAMMER2_FLUSH_TOP); 2250 } 2251 rup_error |= tmp_error; 2252 } 2253 return ((error | rup_error) & ~HAMMER2_ERROR_EOF); 2254 } 2255 2256 /* 2257 * Sync a mount point; this is called on a per-mount basis from the 2258 * filesystem syncer process periodically and whenever a user issues 2259 * a sync. 2260 */ 2261 int 2262 hammer2_vfs_sync(struct mount *mp, int waitfor) 2263 { 2264 hammer2_xop_flush_t *xop; 2265 struct hammer2_sync_info info; 2266 hammer2_inode_t *iroot; 2267 hammer2_pfs_t *pmp; 2268 int flags; 2269 int error; 2270 2271 pmp = MPTOPMP(mp); 2272 iroot = pmp->iroot; 2273 KKASSERT(iroot); 2274 KKASSERT(iroot->pmp == pmp); 2275 2276 /* 2277 * We can't acquire locks on existing vnodes while in a transaction 2278 * without risking a deadlock. This assumes that vfsync() can be 2279 * called without the vnode locked (which it can in DragonFly). 2280 * Otherwise we'd have to implement a multi-pass or flag the lock 2281 * failures and retry. 2282 * 2283 * The reclamation code interlocks with the sync list's token 2284 * (by removing the vnode from the scan list) before unlocking 2285 * the inode, giving us time to ref the inode. 2286 */ 2287 /*flags = VMSC_GETVP;*/ 2288 flags = 0; 2289 if (waitfor & MNT_LAZY) 2290 flags |= VMSC_ONEPASS; 2291 2292 /* 2293 * Preflush the vnodes using a normal transaction before interlocking 2294 * with a flush transaction. We do this to try to run as much of 2295 * the compression as possible outside the flush transaction. 2296 * 2297 * For efficiency do an async pass before making sure with a 2298 * synchronous pass on all related buffer cache buffers. 2299 */ 2300 hammer2_trans_init(pmp, 0); 2301 info.error = 0; 2302 info.waitfor = MNT_NOWAIT; 2303 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2304 info.waitfor = MNT_WAIT; 2305 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2306 hammer2_trans_done(pmp); 2307 2308 /* 2309 * Start our flush transaction. This does not return until all 2310 * concurrent transactions have completed and will prevent any 2311 * new transactions from running concurrently, except for the 2312 * buffer cache transactions. 2313 * 2314 * (1) vfsync() all dirty vnodes via vfsyncscan(). 2315 * 2316 * (2) Flush any remaining dirty inodes (the sideq), including any 2317 * which may have been created during or raced against the 2318 * vfsync(). To catch all cases this must be done after the 2319 * vfsync(). 2320 * 2321 * (3) Wait for any pending BIO I/O to complete (hammer2_bioq_sync()). 2322 * 2323 * NOTE! It is still possible for the paging code to push pages 2324 * out via a UIO_NOCOPY hammer2_vop_write() during the main 2325 * flush. 2326 */ 2327 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2328 2329 info.error = 0; 2330 info.waitfor = MNT_NOWAIT; 2331 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info); 2332 info.waitfor = MNT_WAIT; 2333 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2334 hammer2_inode_run_sideq(pmp, 1); 2335 hammer2_bioq_sync(pmp); 2336 2337 /* 2338 * Use the XOP interface to concurrently flush all nodes to 2339 * synchronize the PFSROOT subtopology to the media. A standard 2340 * end-of-scan ENOENT error indicates cluster sufficiency. 2341 * 2342 * Note that this flush will not be visible on crash recovery until 2343 * we flush the super-root topology in the next loop. 2344 * 2345 * XXX For now wait for all flushes to complete. 2346 */ 2347 if (iroot) { 2348 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING); 2349 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush); 2350 error = hammer2_xop_collect(&xop->head, 2351 HAMMER2_XOP_COLLECT_WAITALL); 2352 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2353 if (error == HAMMER2_ERROR_ENOENT) 2354 error = 0; 2355 else 2356 error = hammer2_error_to_errno(error); 2357 } else { 2358 error = 0; 2359 } 2360 hammer2_trans_done(pmp); 2361 2362 return (error); 2363 } 2364 2365 /* 2366 * Sync passes. 2367 * 2368 * Note that we ignore the tranasction mtid we got above. Instead, 2369 * each vfsync below will ultimately get its own via TRANS_BUFCACHE 2370 * transactions. 2371 */ 2372 static int 2373 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 2374 { 2375 struct hammer2_sync_info *info = data; 2376 hammer2_inode_t *ip; 2377 int error; 2378 2379 /* 2380 * Degenerate cases. Note that ip == NULL typically means the 2381 * syncer vnode itself and we don't want to vclrisdirty() in that 2382 * situation. 2383 */ 2384 ip = VTOI(vp); 2385 if (ip == NULL) { 2386 return(0); 2387 } 2388 if (vp->v_type == VNON || vp->v_type == VBAD) { 2389 vclrisdirty(vp); 2390 return(0); 2391 } 2392 2393 /* 2394 * VOP_FSYNC will start a new transaction so replicate some code 2395 * here to do it inline (see hammer2_vop_fsync()). 2396 * 2397 * WARNING: The vfsync interacts with the buffer cache and might 2398 * block, we can't hold the inode lock at that time. 2399 * However, we MUST ref ip before blocking to ensure that 2400 * it isn't ripped out from under us (since we do not 2401 * hold a lock on the vnode). 2402 */ 2403 hammer2_inode_ref(ip); 2404 if ((ip->flags & HAMMER2_INODE_MODIFIED) || 2405 !RB_EMPTY(&vp->v_rbdirty_tree)) { 2406 vfsync(vp, info->waitfor, 1, NULL, NULL); 2407 if (ip->flags & (HAMMER2_INODE_RESIZED | 2408 HAMMER2_INODE_MODIFIED)) { 2409 hammer2_inode_lock(ip, 0); 2410 if (ip->flags & (HAMMER2_INODE_RESIZED | 2411 HAMMER2_INODE_MODIFIED)) { 2412 hammer2_inode_chain_sync(ip); 2413 } 2414 hammer2_inode_unlock(ip); 2415 } 2416 } 2417 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 && 2418 RB_EMPTY(&vp->v_rbdirty_tree)) { 2419 vclrisdirty(vp); 2420 } 2421 2422 hammer2_inode_drop(ip); 2423 #if 1 2424 error = 0; 2425 if (error) 2426 info->error = error; 2427 #endif 2428 return(0); 2429 } 2430 2431 static 2432 int 2433 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2434 { 2435 hammer2_inode_t *ip; 2436 2437 KKASSERT(MAXFIDSZ >= 16); 2438 ip = VTOI(vp); 2439 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2440 fhp->fid_ext = 0; 2441 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2442 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2443 2444 return 0; 2445 } 2446 2447 static 2448 int 2449 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2450 struct fid *fhp, struct vnode **vpp) 2451 { 2452 hammer2_pfs_t *pmp; 2453 hammer2_tid_t inum; 2454 int error; 2455 2456 pmp = MPTOPMP(mp); 2457 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2458 if (vpp) { 2459 if (inum == 1) 2460 error = hammer2_vfs_root(mp, vpp); 2461 else 2462 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2463 } else { 2464 error = 0; 2465 } 2466 if (error) 2467 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2468 return error; 2469 } 2470 2471 static 2472 int 2473 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2474 int *exflagsp, struct ucred **credanonp) 2475 { 2476 hammer2_pfs_t *pmp; 2477 struct netcred *np; 2478 int error; 2479 2480 pmp = MPTOPMP(mp); 2481 np = vfs_export_lookup(mp, &pmp->export, nam); 2482 if (np) { 2483 *exflagsp = np->netc_exflags; 2484 *credanonp = &np->netc_anon; 2485 error = 0; 2486 } else { 2487 error = EACCES; 2488 } 2489 return error; 2490 } 2491 2492 /* 2493 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2494 * header into the HMP 2495 * 2496 * XXX read four volhdrs and use the one with the highest TID whos CRC 2497 * matches. 2498 * 2499 * XXX check iCRCs. 2500 * 2501 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2502 * nonexistant locations. 2503 * 2504 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2505 */ 2506 static 2507 int 2508 hammer2_install_volume_header(hammer2_dev_t *hmp) 2509 { 2510 hammer2_volume_data_t *vd; 2511 struct buf *bp; 2512 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2513 int error_reported; 2514 int error; 2515 int valid; 2516 int i; 2517 2518 error_reported = 0; 2519 error = 0; 2520 valid = 0; 2521 bp = NULL; 2522 2523 /* 2524 * There are up to 4 copies of the volume header (syncs iterate 2525 * between them so there is no single master). We don't trust the 2526 * volu_size field so we don't know precisely how large the filesystem 2527 * is, so depend on the OS to return an error if we go beyond the 2528 * block device's EOF. 2529 */ 2530 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2531 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2532 HAMMER2_VOLUME_BYTES, &bp); 2533 if (error) { 2534 brelse(bp); 2535 bp = NULL; 2536 continue; 2537 } 2538 2539 vd = (struct hammer2_volume_data *) bp->b_data; 2540 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2541 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2542 brelse(bp); 2543 bp = NULL; 2544 continue; 2545 } 2546 2547 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2548 /* XXX: Reversed-endianness filesystem */ 2549 kprintf("hammer2: reverse-endian filesystem detected"); 2550 brelse(bp); 2551 bp = NULL; 2552 continue; 2553 } 2554 2555 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2556 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2557 HAMMER2_VOLUME_ICRC0_SIZE); 2558 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2559 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2560 HAMMER2_VOLUME_ICRC1_SIZE); 2561 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2562 kprintf("hammer2 volume header crc " 2563 "mismatch copy #%d %08x/%08x\n", 2564 i, crc0, crc); 2565 error_reported = 1; 2566 brelse(bp); 2567 bp = NULL; 2568 continue; 2569 } 2570 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2571 valid = 1; 2572 hmp->voldata = *vd; 2573 hmp->volhdrno = i; 2574 } 2575 brelse(bp); 2576 bp = NULL; 2577 } 2578 if (valid) { 2579 hmp->volsync = hmp->voldata; 2580 hmp->free_reserved = hmp->voldata.allocator_size / 20; 2581 error = 0; 2582 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2583 kprintf("hammer2: using volume header #%d\n", 2584 hmp->volhdrno); 2585 } 2586 } else { 2587 error = EINVAL; 2588 kprintf("hammer2: no valid volume headers found!\n"); 2589 } 2590 return (error); 2591 } 2592 2593 /* 2594 * This handles hysteresis on regular file flushes. Because the BIOs are 2595 * routed to a thread it is possible for an excessive number to build up 2596 * and cause long front-end stalls long before the runningbuffspace limit 2597 * is hit, so we implement hammer2_flush_pipe to control the 2598 * hysteresis. 2599 * 2600 * This is a particular problem when compression is used. 2601 */ 2602 void 2603 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2604 { 2605 atomic_add_int(&pmp->count_lwinprog, 1); 2606 } 2607 2608 void 2609 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2610 { 2611 int lwinprog; 2612 2613 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2614 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2615 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2616 atomic_clear_int(&pmp->count_lwinprog, 2617 HAMMER2_LWINPROG_WAITING); 2618 wakeup(&pmp->count_lwinprog); 2619 } 2620 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2621 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2622 atomic_clear_int(&pmp->count_lwinprog, 2623 HAMMER2_LWINPROG_WAITING0); 2624 wakeup(&pmp->count_lwinprog); 2625 } 2626 } 2627 2628 void 2629 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2630 { 2631 int lwinprog; 2632 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2633 HAMMER2_LWINPROG_WAITING0; 2634 2635 for (;;) { 2636 lwinprog = pmp->count_lwinprog; 2637 cpu_ccfence(); 2638 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2639 break; 2640 tsleep_interlock(&pmp->count_lwinprog, 0); 2641 atomic_set_int(&pmp->count_lwinprog, lwflag); 2642 lwinprog = pmp->count_lwinprog; 2643 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2644 break; 2645 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2646 } 2647 } 2648 2649 /* 2650 * Manage excessive memory resource use for chain and related 2651 * structures. 2652 */ 2653 void 2654 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2655 { 2656 uint32_t waiting; 2657 uint32_t count; 2658 uint32_t limit; 2659 #if 0 2660 static int zzticks; 2661 #endif 2662 2663 /* 2664 * Atomic check condition and wait. Also do an early speedup of 2665 * the syncer to try to avoid hitting the wait. 2666 */ 2667 for (;;) { 2668 waiting = pmp->inmem_dirty_chains; 2669 cpu_ccfence(); 2670 count = waiting & HAMMER2_DIRTYCHAIN_MASK; 2671 2672 limit = pmp->mp->mnt_nvnodelistsize / 10; 2673 if (limit < hammer2_limit_dirty_chains) 2674 limit = hammer2_limit_dirty_chains; 2675 if (limit < 1000) 2676 limit = 1000; 2677 2678 #if 0 2679 if ((int)(ticks - zzticks) > hz) { 2680 zzticks = ticks; 2681 kprintf("count %ld %ld\n", count, limit); 2682 } 2683 #endif 2684 2685 /* 2686 * Block if there are too many dirty chains present, wait 2687 * for the flush to clean some out. 2688 */ 2689 if (count > limit) { 2690 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 2691 if (atomic_cmpset_int(&pmp->inmem_dirty_chains, 2692 waiting, 2693 waiting | HAMMER2_DIRTYCHAIN_WAITING)) { 2694 speedup_syncer(pmp->mp); 2695 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, 2696 "chnmem", hz); 2697 } 2698 continue; /* loop on success or fail */ 2699 } 2700 2701 /* 2702 * Try to start an early flush before we are forced to block. 2703 */ 2704 if (count > limit * 7 / 10) 2705 speedup_syncer(pmp->mp); 2706 break; 2707 } 2708 } 2709 2710 void 2711 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 2712 { 2713 if (pmp) { 2714 atomic_add_int(&pmp->inmem_dirty_chains, 1); 2715 } 2716 } 2717 2718 void 2719 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 2720 { 2721 uint32_t waiting; 2722 2723 if (pmp) { 2724 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1); 2725 /* don't need --waiting to test flag */ 2726 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) { 2727 atomic_clear_int(&pmp->inmem_dirty_chains, 2728 HAMMER2_DIRTYCHAIN_WAITING); 2729 wakeup(&pmp->inmem_dirty_chains); 2730 } 2731 } 2732 } 2733 2734 /* 2735 * Returns 0 if the filesystem has tons of free space 2736 * Returns 1 if the filesystem has less than 10% remaining 2737 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining. 2738 */ 2739 int 2740 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred) 2741 { 2742 hammer2_pfs_t *pmp; 2743 hammer2_dev_t *hmp; 2744 hammer2_off_t free_reserved; 2745 hammer2_off_t free_nominal; 2746 int i; 2747 2748 pmp = ip->pmp; 2749 2750 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) { 2751 free_reserved = HAMMER2_SEGSIZE; 2752 free_nominal = 0x7FFFFFFFFFFFFFFFLLU; 2753 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2754 hmp = pmp->pfs_hmps[i]; 2755 if (hmp == NULL) 2756 continue; 2757 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER && 2758 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER) 2759 continue; 2760 2761 if (free_nominal > hmp->voldata.allocator_free) 2762 free_nominal = hmp->voldata.allocator_free; 2763 if (free_reserved < hmp->free_reserved) 2764 free_reserved = hmp->free_reserved; 2765 } 2766 2767 /* 2768 * SMP races ok 2769 */ 2770 pmp->free_reserved = free_reserved; 2771 pmp->free_nominal = free_nominal; 2772 pmp->free_ticks = ticks; 2773 } else { 2774 free_reserved = pmp->free_reserved; 2775 free_nominal = pmp->free_nominal; 2776 } 2777 if (cred && cred->cr_uid != 0) { 2778 if ((int64_t)(free_nominal - bytes) < 2779 (int64_t)free_reserved) { 2780 return 2; 2781 } 2782 } else { 2783 if ((int64_t)(free_nominal - bytes) < 2784 (int64_t)free_reserved / 2) { 2785 return 2; 2786 } 2787 } 2788 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2) 2789 return 1; 2790 return 0; 2791 } 2792 2793 /* 2794 * Debugging 2795 */ 2796 void 2797 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx) 2798 { 2799 hammer2_chain_t *scan; 2800 hammer2_chain_t *parent; 2801 2802 --*countp; 2803 if (*countp == 0) { 2804 kprintf("%*.*s...\n", tab, tab, ""); 2805 return; 2806 } 2807 if (*countp < 0) 2808 return; 2809 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 2810 tab, tab, "", pfx, 2811 chain, chain->bref.type, 2812 chain->bref.key, chain->bref.keybits, 2813 chain->bref.mirror_tid); 2814 2815 kprintf("%*.*s [%08x] (%s) refs=%d", 2816 tab, tab, "", 2817 chain->flags, 2818 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 2819 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 2820 chain->refs); 2821 2822 parent = chain->parent; 2823 if (parent) 2824 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 2825 tab, tab, "", 2826 parent, parent->flags, parent->refs); 2827 if (RB_EMPTY(&chain->core.rbtree)) { 2828 kprintf("\n"); 2829 } else { 2830 kprintf(" {\n"); 2831 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) 2832 hammer2_dump_chain(scan, tab + 4, countp, 'a'); 2833 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 2834 kprintf("%*.*s}(%s)\n", tab, tab, "", 2835 chain->data->ipdata.filename); 2836 else 2837 kprintf("%*.*s}\n", tab, tab, ""); 2838 } 2839 } 2840