1 /* 2 * Copyright (c) 2011-2018 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/mountctl.h> 51 #include <sys/dirent.h> 52 #include <sys/uio.h> 53 54 #include "hammer2.h" 55 #include "hammer2_disk.h" 56 #include "hammer2_mount.h" 57 #include "hammer2_lz4.h" 58 59 #include "zlib/hammer2_zlib.h" 60 61 #define REPORT_REFS_ERRORS 1 /* XXX remove me */ 62 63 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache"); 64 65 struct hammer2_sync_info { 66 int error; 67 int waitfor; 68 int pass; 69 }; 70 71 TAILQ_HEAD(hammer2_mntlist, hammer2_dev); 72 static struct hammer2_mntlist hammer2_mntlist; 73 74 struct hammer2_pfslist hammer2_pfslist; 75 struct hammer2_pfslist hammer2_spmplist; 76 struct lock hammer2_mntlk; 77 78 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT; 79 int hammer2_debug; 80 int hammer2_xopgroups; 81 long hammer2_debug_inode; 82 int hammer2_cluster_meta_read = 1; /* physical read-ahead */ 83 int hammer2_cluster_data_read = 4; /* physical read-ahead */ 84 int hammer2_cluster_write = 0; /* physical write clustering */ 85 int hammer2_dedup_enable = 1; 86 int hammer2_always_compress = 0; /* always try to compress */ 87 int hammer2_flush_pipe = 100; 88 int hammer2_dio_count; 89 int hammer2_dio_limit = 256; 90 int hammer2_bulkfree_tps = 5000; 91 int hammer2_worker_rmask = 3; 92 long hammer2_chain_allocs; 93 long hammer2_limit_dirty_chains; 94 long hammer2_limit_dirty_inodes; 95 long hammer2_count_modified_chains; 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 static long hammer2_iod_inode_creates; 110 static long hammer2_iod_inode_deletes; 111 112 long hammer2_process_icrc32; 113 long hammer2_process_xxhash64; 114 115 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 116 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 117 "Buffer used for compression."); 118 119 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 120 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 121 "Buffer used for decompression."); 122 123 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 124 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD, 126 &hammer2_supported_version, 0, ""); 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 128 &hammer2_debug, 0, ""); 129 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, debug_inode, CTLFLAG_RW, 130 &hammer2_debug_inode, 0, ""); 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW, 132 &hammer2_cluster_meta_read, 0, ""); 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW, 134 &hammer2_cluster_data_read, 0, ""); 135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW, 136 &hammer2_cluster_write, 0, ""); 137 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 138 &hammer2_dedup_enable, 0, ""); 139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW, 140 &hammer2_always_compress, 0, ""); 141 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 142 &hammer2_flush_pipe, 0, ""); 143 SYSCTL_INT(_vfs_hammer2, OID_AUTO, worker_rmask, CTLFLAG_RW, 144 &hammer2_worker_rmask, 0, ""); 145 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW, 146 &hammer2_bulkfree_tps, 0, ""); 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW, 148 &hammer2_chain_allocs, 0, ""); 149 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 150 &hammer2_limit_dirty_chains, 0, ""); 151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW, 152 &hammer2_limit_dirty_inodes, 0, ""); 153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW, 154 &hammer2_count_modified_chains, 0, ""); 155 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 156 &hammer2_dio_count, 0, ""); 157 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW, 158 &hammer2_dio_limit, 0, ""); 159 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 161 &hammer2_iod_file_read, 0, ""); 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 163 &hammer2_iod_meta_read, 0, ""); 164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 165 &hammer2_iod_indr_read, 0, ""); 166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 167 &hammer2_iod_fmap_read, 0, ""); 168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 169 &hammer2_iod_volu_read, 0, ""); 170 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 172 &hammer2_iod_file_write, 0, ""); 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW, 174 &hammer2_iod_file_wembed, 0, ""); 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW, 176 &hammer2_iod_file_wzero, 0, ""); 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW, 178 &hammer2_iod_file_wdedup, 0, ""); 179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 180 &hammer2_iod_meta_write, 0, ""); 181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 182 &hammer2_iod_indr_write, 0, ""); 183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 184 &hammer2_iod_fmap_write, 0, ""); 185 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 186 &hammer2_iod_volu_write, 0, ""); 187 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_creates, CTLFLAG_RW, 188 &hammer2_iod_inode_creates, 0, ""); 189 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_deletes, CTLFLAG_RW, 190 &hammer2_iod_inode_deletes, 0, ""); 191 192 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW, 193 &hammer2_process_icrc32, 0, ""); 194 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW, 195 &hammer2_process_xxhash64, 0, ""); 196 197 static int hammer2_vfs_init(struct vfsconf *conf); 198 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 199 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 200 struct ucred *cred); 201 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 202 struct vnode *, struct ucred *); 203 static int hammer2_recovery(hammer2_dev_t *hmp); 204 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 205 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 206 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 207 struct ucred *cred); 208 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 209 struct ucred *cred); 210 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 211 struct fid *fhp, struct vnode **vpp); 212 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 213 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 214 int *exflagsp, struct ucred **credanonp); 215 static int hammer2_vfs_modifying(struct mount *mp); 216 217 static int hammer2_install_volume_header(hammer2_dev_t *hmp); 218 #if 0 219 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 220 #endif 221 222 static void hammer2_update_pmps(hammer2_dev_t *hmp); 223 224 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 225 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 226 hammer2_dev_t *hmp); 227 static int hammer2_fixup_pfses(hammer2_dev_t *hmp); 228 229 /* 230 * HAMMER2 vfs operations. 231 */ 232 static struct vfsops hammer2_vfsops = { 233 .vfs_flags = 0, 234 .vfs_init = hammer2_vfs_init, 235 .vfs_uninit = hammer2_vfs_uninit, 236 .vfs_sync = hammer2_vfs_sync, 237 .vfs_mount = hammer2_vfs_mount, 238 .vfs_unmount = hammer2_vfs_unmount, 239 .vfs_root = hammer2_vfs_root, 240 .vfs_statfs = hammer2_vfs_statfs, 241 .vfs_statvfs = hammer2_vfs_statvfs, 242 .vfs_vget = hammer2_vfs_vget, 243 .vfs_vptofh = hammer2_vfs_vptofh, 244 .vfs_fhtovp = hammer2_vfs_fhtovp, 245 .vfs_checkexp = hammer2_vfs_checkexp, 246 .vfs_modifying = hammer2_vfs_modifying 247 }; 248 249 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 250 251 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE); 252 MODULE_VERSION(hammer2, 1); 253 254 static 255 int 256 hammer2_vfs_init(struct vfsconf *conf) 257 { 258 static struct objcache_malloc_args margs_read; 259 static struct objcache_malloc_args margs_write; 260 static struct objcache_malloc_args margs_vop; 261 262 int error; 263 264 error = 0; 265 kmalloc_raise_limit(M_HAMMER2, 0); /* unlimited */ 266 267 /* 268 * hammer2_xopgroups must be even and is most optimal if 269 * 2 x ncpus so strategy functions can be queued to the same 270 * cpu. 271 */ 272 hammer2_xopgroups = HAMMER2_XOPGROUPS_MIN; 273 if (hammer2_xopgroups < ncpus * 2) 274 hammer2_xopgroups = ncpus * 2; 275 276 /* 277 * A large DIO cache is needed to retain dedup enablement masks. 278 * The bulkfree code clears related masks as part of the disk block 279 * recycling algorithm, preventing it from being used for a later 280 * dedup. 281 * 282 * NOTE: A large buffer cache can actually interfere with dedup 283 * operation because we dedup based on media physical buffers 284 * and not logical buffers. Try to make the DIO case large 285 * enough to avoid this problem, but also cap it. 286 */ 287 hammer2_dio_limit = nbuf * 2; 288 if (hammer2_dio_limit > 100000) 289 hammer2_dio_limit = 100000; 290 291 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 292 error = EINVAL; 293 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 294 error = EINVAL; 295 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 296 error = EINVAL; 297 298 if (error) 299 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 300 301 margs_read.objsize = 65536; 302 margs_read.mtype = M_HAMMER2_DEBUFFER; 303 304 margs_write.objsize = 32768; 305 margs_write.mtype = M_HAMMER2_CBUFFER; 306 307 margs_vop.objsize = sizeof(hammer2_xop_t); 308 margs_vop.mtype = M_HAMMER2; 309 310 /* 311 * Note thaht for the XOPS cache we want backing store allocations 312 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 313 * confusion), so use the backing store function that does it. This 314 * means that initial XOPS objects are zerod but REUSED objects are 315 * not. So we are responsible for cleaning the object up sufficiently 316 * for our needs before objcache_put()ing it back (typically just the 317 * FIFO indices). 318 */ 319 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 320 0, 1, NULL, NULL, NULL, 321 objcache_malloc_alloc, 322 objcache_malloc_free, 323 &margs_read); 324 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 325 0, 1, NULL, NULL, NULL, 326 objcache_malloc_alloc, 327 objcache_malloc_free, 328 &margs_write); 329 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 330 0, 1, NULL, NULL, NULL, 331 objcache_malloc_alloc_zero, 332 objcache_malloc_free, 333 &margs_vop); 334 335 336 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 337 TAILQ_INIT(&hammer2_mntlist); 338 TAILQ_INIT(&hammer2_pfslist); 339 TAILQ_INIT(&hammer2_spmplist); 340 341 hammer2_limit_dirty_chains = maxvnodes / 10; 342 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 343 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 344 if (hammer2_limit_dirty_chains < 1000) 345 hammer2_limit_dirty_chains = 1000; 346 347 hammer2_limit_dirty_inodes = maxvnodes / 25; 348 if (hammer2_limit_dirty_inodes < 100) 349 hammer2_limit_dirty_inodes = 100; 350 if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES) 351 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES; 352 353 return (error); 354 } 355 356 static 357 int 358 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 359 { 360 objcache_destroy(cache_buffer_read); 361 objcache_destroy(cache_buffer_write); 362 objcache_destroy(cache_xops); 363 return 0; 364 } 365 366 /* 367 * Core PFS allocator. Used to allocate or reference the pmp structure 368 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 369 * The pmp can be passed in or loaded by this function using the chain and 370 * inode data. 371 * 372 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 373 * transactions. Note that synchronization does not use this field. 374 * (typically frontend operations and synchronization cannot run on the 375 * same PFS node at the same time). 376 * 377 * XXX check locking 378 */ 379 hammer2_pfs_t * 380 hammer2_pfsalloc(hammer2_chain_t *chain, 381 const hammer2_inode_data_t *ripdata, 382 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 383 { 384 hammer2_pfs_t *pmp; 385 hammer2_inode_t *iroot; 386 int count; 387 int i; 388 int j; 389 390 pmp = NULL; 391 392 /* 393 * Locate or create the PFS based on the cluster id. If ripdata 394 * is NULL this is a spmp which is unique and is always allocated. 395 * 396 * If the device is mounted in local mode all PFSs are considered 397 * independent and not part of any cluster (for debugging only). 398 */ 399 if (ripdata) { 400 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 401 if (force_local != pmp->force_local) 402 continue; 403 if (force_local == NULL && 404 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 405 sizeof(pmp->pfs_clid)) == 0) { 406 break; 407 } else if (force_local && pmp->pfs_names[0] && 408 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 409 break; 410 } 411 } 412 } 413 414 if (pmp == NULL) { 415 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 416 pmp->force_local = force_local; 417 hammer2_trans_manage_init(pmp); 418 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 419 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 420 lockinit(&pmp->lock, "pfslk", 0, 0); 421 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 422 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 423 spin_init(&pmp->xop_spin, "h2xop"); 424 spin_init(&pmp->lru_spin, "h2lru"); 425 RB_INIT(&pmp->inum_tree); 426 TAILQ_INIT(&pmp->syncq); 427 TAILQ_INIT(&pmp->depq); 428 TAILQ_INIT(&pmp->lru_list); 429 spin_init(&pmp->list_spin, "h2pfsalloc_list"); 430 431 /* 432 * Save the last media transaction id for the flusher. Set 433 * initial 434 */ 435 if (ripdata) { 436 pmp->pfs_clid = ripdata->meta.pfs_clid; 437 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 438 } else { 439 pmp->flags |= HAMMER2_PMPF_SPMP; 440 TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry); 441 } 442 443 /* 444 * The synchronization thread may start too early, make 445 * sure it stays frozen until we are ready to let it go. 446 * XXX 447 */ 448 /* 449 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 450 HAMMER2_THREAD_REMASTER; 451 */ 452 } 453 454 /* 455 * Create the PFS's root inode and any missing XOP helper threads. 456 */ 457 if ((iroot = pmp->iroot) == NULL) { 458 iroot = hammer2_inode_get(pmp, NULL, 1, -1); 459 if (ripdata) 460 iroot->meta = ripdata->meta; 461 pmp->iroot = iroot; 462 hammer2_inode_ref(iroot); 463 hammer2_inode_unlock(iroot); 464 } 465 466 /* 467 * Stop here if no chain is passed in. 468 */ 469 if (chain == NULL) 470 goto done; 471 472 /* 473 * When a chain is passed in we must add it to the PFS's root 474 * inode, update pmp->pfs_types[], and update the syncronization 475 * threads. 476 * 477 * When forcing local mode, mark the PFS as a MASTER regardless. 478 * 479 * At the moment empty spots can develop due to removals or failures. 480 * Ultimately we want to re-fill these spots but doing so might 481 * confused running code. XXX 482 */ 483 hammer2_inode_ref(iroot); 484 hammer2_mtx_ex(&iroot->lock); 485 j = iroot->cluster.nchains; 486 487 if (j == HAMMER2_MAXCLUSTER) { 488 kprintf("hammer2_pfsalloc: cluster full!\n"); 489 /* XXX fatal error? */ 490 } else { 491 KKASSERT(chain->pmp == NULL); 492 chain->pmp = pmp; 493 hammer2_chain_ref(chain); 494 iroot->cluster.array[j].chain = chain; 495 if (force_local) 496 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 497 else 498 pmp->pfs_types[j] = ripdata->meta.pfs_type; 499 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 500 pmp->pfs_hmps[j] = chain->hmp; 501 hammer2_spin_ex(&pmp->inum_spin); 502 pmp->pfs_iroot_blocksets[j] = chain->data->ipdata.u.blockset; 503 hammer2_spin_unex(&pmp->inum_spin); 504 505 /* 506 * If the PFS is already mounted we must account 507 * for the mount_count here. 508 */ 509 if (pmp->mp) 510 ++chain->hmp->mount_count; 511 512 /* 513 * May have to fixup dirty chain tracking. Previous 514 * pmp was NULL so nothing to undo. 515 */ 516 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 517 hammer2_pfs_memory_inc(pmp); 518 ++j; 519 } 520 iroot->cluster.nchains = j; 521 522 /* 523 * Update nmasters from any PFS inode which is part of the cluster. 524 * It is possible that this will result in a value which is too 525 * high. MASTER PFSs are authoritative for pfs_nmasters and will 526 * override this value later on. 527 * 528 * (This informs us of masters that might not currently be 529 * discoverable by this mount). 530 */ 531 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 532 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 533 } 534 535 /* 536 * Count visible masters. Masters are usually added with 537 * ripdata->meta.pfs_nmasters set to 1. This detects when there 538 * are more (XXX and must update the master inodes). 539 */ 540 count = 0; 541 for (i = 0; i < iroot->cluster.nchains; ++i) { 542 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 543 ++count; 544 } 545 if (pmp->pfs_nmasters < count) 546 pmp->pfs_nmasters = count; 547 548 /* 549 * Create missing synchronization and support threads. 550 * 551 * Single-node masters (including snapshots) have nothing to 552 * synchronize and do not require this thread. 553 * 554 * Multi-node masters or any number of soft masters, slaves, copy, 555 * or other PFS types need the thread. 556 * 557 * Each thread is responsible for its particular cluster index. 558 * We use independent threads so stalls or mismatches related to 559 * any given target do not affect other targets. 560 */ 561 for (i = 0; i < iroot->cluster.nchains; ++i) { 562 /* 563 * Single-node masters (including snapshots) have nothing 564 * to synchronize and will make direct xops support calls, 565 * thus they do not require this thread. 566 * 567 * Note that there can be thousands of snapshots. We do not 568 * want to create thousands of threads. 569 */ 570 if (pmp->pfs_nmasters <= 1 && 571 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 572 continue; 573 } 574 575 /* 576 * Sync support thread 577 */ 578 if (pmp->sync_thrs[i].td == NULL) { 579 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL, 580 "h2nod", i, -1, 581 hammer2_primary_sync_thread); 582 } 583 } 584 585 /* 586 * Create missing Xop threads 587 * 588 * NOTE: We create helper threads for all mounted PFSs or any 589 * PFSs with 2+ nodes (so the sync thread can update them, 590 * even if not mounted). 591 */ 592 if (pmp->mp || iroot->cluster.nchains >= 2) 593 hammer2_xop_helper_create(pmp); 594 595 hammer2_mtx_unlock(&iroot->lock); 596 hammer2_inode_drop(iroot); 597 done: 598 return pmp; 599 } 600 601 /* 602 * Deallocate an element of a probed PFS. If destroying and this is a 603 * MASTER, adjust nmasters. 604 * 605 * This function does not physically destroy the PFS element in its device 606 * under the super-root (see hammer2_ioctl_pfs_delete()). 607 */ 608 void 609 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 610 { 611 hammer2_inode_t *iroot; 612 hammer2_chain_t *chain; 613 int j; 614 615 /* 616 * Cleanup our reference on iroot. iroot is (should) not be needed 617 * by the flush code. 618 */ 619 iroot = pmp->iroot; 620 if (iroot) { 621 /* 622 * Stop synchronizing 623 * 624 * XXX flush after acquiring the iroot lock. 625 * XXX clean out the cluster index from all inode structures. 626 */ 627 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 628 629 /* 630 * Remove the cluster index from the group. If destroying 631 * the PFS and this is a master, adjust pfs_nmasters. 632 */ 633 hammer2_mtx_ex(&iroot->lock); 634 chain = iroot->cluster.array[clindex].chain; 635 iroot->cluster.array[clindex].chain = NULL; 636 637 switch(pmp->pfs_types[clindex]) { 638 case HAMMER2_PFSTYPE_MASTER: 639 if (destroying && pmp->pfs_nmasters > 0) 640 --pmp->pfs_nmasters; 641 /* XXX adjust ripdata->meta.pfs_nmasters */ 642 break; 643 default: 644 break; 645 } 646 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 647 648 hammer2_mtx_unlock(&iroot->lock); 649 650 /* 651 * Release the chain. 652 */ 653 if (chain) { 654 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 655 hammer2_chain_drop(chain); 656 } 657 658 /* 659 * Terminate all XOP threads for the cluster index. 660 */ 661 if (pmp->xop_groups) { 662 for (j = 0; j < hammer2_xopgroups; ++j) { 663 hammer2_thr_delete( 664 &pmp->xop_groups[j].thrs[clindex]); 665 } 666 } 667 } 668 } 669 670 /* 671 * Destroy a PFS, typically only occurs after the last mount on a device 672 * has gone away. 673 */ 674 static void 675 hammer2_pfsfree(hammer2_pfs_t *pmp) 676 { 677 hammer2_inode_t *iroot; 678 hammer2_chain_t *chain; 679 int chains_still_present = 0; 680 int i; 681 int j; 682 683 /* 684 * Cleanup our reference on iroot. iroot is (should) not be needed 685 * by the flush code. 686 */ 687 if (pmp->flags & HAMMER2_PMPF_SPMP) 688 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry); 689 else 690 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 691 692 /* 693 * Cleanup chains remaining on LRU list. 694 */ 695 hammer2_spin_ex(&pmp->lru_spin); 696 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 697 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU); 698 atomic_add_int(&pmp->lru_count, -1); 699 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU); 700 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node); 701 hammer2_chain_ref(chain); 702 hammer2_spin_unex(&pmp->lru_spin); 703 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 704 hammer2_chain_drop(chain); 705 hammer2_spin_ex(&pmp->lru_spin); 706 } 707 hammer2_spin_unex(&pmp->lru_spin); 708 709 /* 710 * Clean up iroot 711 */ 712 iroot = pmp->iroot; 713 if (iroot) { 714 for (i = 0; i < iroot->cluster.nchains; ++i) { 715 hammer2_thr_delete(&pmp->sync_thrs[i]); 716 if (pmp->xop_groups) { 717 for (j = 0; j < hammer2_xopgroups; ++j) 718 hammer2_thr_delete( 719 &pmp->xop_groups[j].thrs[i]); 720 } 721 chain = iroot->cluster.array[i].chain; 722 if (chain && !RB_EMPTY(&chain->core.rbtree)) { 723 kprintf("hammer2: Warning pmp %p still " 724 "has active chains\n", pmp); 725 chains_still_present = 1; 726 } 727 } 728 #if REPORT_REFS_ERRORS 729 if (iroot->refs != 1) 730 kprintf("PMP->IROOT %p REFS WRONG %d\n", 731 iroot, iroot->refs); 732 #else 733 KKASSERT(iroot->refs == 1); 734 #endif 735 /* ref for iroot */ 736 hammer2_inode_drop(iroot); 737 pmp->iroot = NULL; 738 } 739 740 /* 741 * Free remaining pmp resources 742 */ 743 if (chains_still_present) { 744 kprintf("hammer2: cannot free pmp %p, still in use\n", pmp); 745 } else { 746 kmalloc_destroy(&pmp->mmsg); 747 kmalloc_destroy(&pmp->minode); 748 kfree(pmp, M_HAMMER2); 749 } 750 } 751 752 /* 753 * Remove all references to hmp from the pfs list. Any PFS which becomes 754 * empty is terminated and freed. 755 * 756 * XXX inefficient. 757 */ 758 static void 759 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which) 760 { 761 hammer2_pfs_t *pmp; 762 hammer2_inode_t *iroot; 763 hammer2_chain_t *rchain; 764 int i; 765 int j; 766 struct hammer2_pfslist *wlist; 767 768 if (which == 0) 769 wlist = &hammer2_pfslist; 770 else 771 wlist = &hammer2_spmplist; 772 again: 773 TAILQ_FOREACH(pmp, wlist, mntentry) { 774 if ((iroot = pmp->iroot) == NULL) 775 continue; 776 777 /* 778 * Determine if this PFS is affected. If it is we must 779 * freeze all management threads and lock its iroot. 780 * 781 * Freezing a management thread forces it idle, operations 782 * in-progress will be aborted and it will have to start 783 * over again when unfrozen, or exit if told to exit. 784 */ 785 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 786 if (pmp->pfs_hmps[i] == hmp) 787 break; 788 } 789 if (i == HAMMER2_MAXCLUSTER) 790 continue; 791 792 hammer2_vfs_sync_pmp(pmp, MNT_WAIT); 793 794 /* 795 * Make sure all synchronization threads are locked 796 * down. 797 */ 798 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 799 if (pmp->pfs_hmps[i] == NULL) 800 continue; 801 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 802 if (pmp->xop_groups) { 803 for (j = 0; j < hammer2_xopgroups; ++j) { 804 hammer2_thr_freeze_async( 805 &pmp->xop_groups[j].thrs[i]); 806 } 807 } 808 } 809 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 810 if (pmp->pfs_hmps[i] == NULL) 811 continue; 812 hammer2_thr_freeze(&pmp->sync_thrs[i]); 813 if (pmp->xop_groups) { 814 for (j = 0; j < hammer2_xopgroups; ++j) { 815 hammer2_thr_freeze( 816 &pmp->xop_groups[j].thrs[i]); 817 } 818 } 819 } 820 821 /* 822 * Lock the inode and clean out matching chains. 823 * Note that we cannot use hammer2_inode_lock_*() 824 * here because that would attempt to validate the 825 * cluster that we are in the middle of ripping 826 * apart. 827 * 828 * WARNING! We are working directly on the inodes 829 * embedded cluster. 830 */ 831 hammer2_mtx_ex(&iroot->lock); 832 833 /* 834 * Remove the chain from matching elements of the PFS. 835 */ 836 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 837 if (pmp->pfs_hmps[i] != hmp) 838 continue; 839 hammer2_thr_delete(&pmp->sync_thrs[i]); 840 if (pmp->xop_groups) { 841 for (j = 0; j < hammer2_xopgroups; ++j) { 842 hammer2_thr_delete( 843 &pmp->xop_groups[j].thrs[i]); 844 } 845 } 846 rchain = iroot->cluster.array[i].chain; 847 iroot->cluster.array[i].chain = NULL; 848 pmp->pfs_types[i] = 0; 849 if (pmp->pfs_names[i]) { 850 kfree(pmp->pfs_names[i], M_HAMMER2); 851 pmp->pfs_names[i] = NULL; 852 } 853 if (rchain) { 854 hammer2_chain_drop(rchain); 855 /* focus hint */ 856 if (iroot->cluster.focus == rchain) 857 iroot->cluster.focus = NULL; 858 } 859 pmp->pfs_hmps[i] = NULL; 860 } 861 hammer2_mtx_unlock(&iroot->lock); 862 863 /* 864 * Cleanup trailing chains. Gaps may remain. 865 */ 866 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 867 if (pmp->pfs_hmps[i]) 868 break; 869 } 870 iroot->cluster.nchains = i + 1; 871 872 /* 873 * If the PMP has no elements remaining we can destroy it. 874 * (this will transition management threads from frozen->exit). 875 */ 876 if (iroot->cluster.nchains == 0) { 877 /* 878 * If this was the hmp's spmp, we need to clean 879 * a little more stuff out. 880 */ 881 if (hmp->spmp == pmp) { 882 hmp->spmp = NULL; 883 hmp->vchain.pmp = NULL; 884 hmp->fchain.pmp = NULL; 885 } 886 887 /* 888 * Free the pmp and restart the loop 889 */ 890 KKASSERT(TAILQ_EMPTY(&pmp->syncq)); 891 KKASSERT(TAILQ_EMPTY(&pmp->depq)); 892 hammer2_pfsfree(pmp); 893 goto again; 894 } 895 896 /* 897 * If elements still remain we need to set the REMASTER 898 * flag and unfreeze it. 899 */ 900 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 901 if (pmp->pfs_hmps[i] == NULL) 902 continue; 903 hammer2_thr_remaster(&pmp->sync_thrs[i]); 904 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 905 if (pmp->xop_groups) { 906 for (j = 0; j < hammer2_xopgroups; ++j) { 907 hammer2_thr_remaster( 908 &pmp->xop_groups[j].thrs[i]); 909 hammer2_thr_unfreeze( 910 &pmp->xop_groups[j].thrs[i]); 911 } 912 } 913 } 914 } 915 } 916 917 /* 918 * Mount or remount HAMMER2 fileystem from physical media 919 * 920 * mountroot 921 * mp mount point structure 922 * path NULL 923 * data <unused> 924 * cred <unused> 925 * 926 * mount 927 * mp mount point structure 928 * path path to mount point 929 * data pointer to argument structure in user space 930 * volume volume path (device@LABEL form) 931 * hflags user mount flags 932 * cred user credentials 933 * 934 * RETURNS: 0 Success 935 * !0 error number 936 */ 937 static 938 int 939 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 940 struct ucred *cred) 941 { 942 struct hammer2_mount_info info; 943 hammer2_pfs_t *pmp; 944 hammer2_pfs_t *spmp; 945 hammer2_dev_t *hmp; 946 hammer2_dev_t *force_local; 947 hammer2_key_t key_next; 948 hammer2_key_t key_dummy; 949 hammer2_key_t lhc; 950 struct vnode *devvp; 951 struct nlookupdata nd; 952 hammer2_chain_t *parent; 953 hammer2_chain_t *chain; 954 const hammer2_inode_data_t *ripdata; 955 hammer2_blockref_t bref; 956 struct file *fp; 957 char devstr[MNAMELEN]; 958 size_t size; 959 size_t done; 960 char *dev; 961 char *label; 962 int ronly = 1; 963 int error; 964 int i; 965 966 hmp = NULL; 967 pmp = NULL; 968 dev = NULL; 969 label = NULL; 970 devvp = NULL; 971 bzero(&info, sizeof(info)); 972 973 if (path) { 974 /* 975 * Non-root mount or updating a mount 976 */ 977 error = copyin(data, &info, sizeof(info)); 978 if (error) 979 return (error); 980 } 981 982 if (mp->mnt_flag & MNT_UPDATE) { 983 /* 984 * Update mount. Note that pmp->iroot->cluster is 985 * an inode-embedded cluster and thus cannot be 986 * directly locked. 987 * 988 * XXX HAMMER2 needs to implement NFS export via 989 * mountctl. 990 */ 991 hammer2_cluster_t *cluster; 992 993 pmp = MPTOPMP(mp); 994 pmp->hflags = info.hflags; 995 cluster = &pmp->iroot->cluster; 996 for (i = 0; i < cluster->nchains; ++i) { 997 if (cluster->array[i].chain == NULL) 998 continue; 999 hmp = cluster->array[i].chain->hmp; 1000 devvp = hmp->devvp; 1001 error = hammer2_remount(hmp, mp, path, 1002 devvp, cred); 1003 if (error) 1004 break; 1005 } 1006 1007 return error; 1008 } 1009 1010 if (path == NULL) { 1011 /* 1012 * Root mount 1013 */ 1014 info.cluster_fd = -1; 1015 ksnprintf(devstr, sizeof(devstr), "%s", 1016 mp->mnt_stat.f_mntfromname); 1017 done = strlen(devstr) + 1; 1018 kprintf("hammer2_mount: root devstr=\"%s\"\n", devstr); 1019 } else { 1020 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 1021 if (error) 1022 return (error); 1023 kprintf("hammer2_mount: devstr=\"%s\"\n", devstr); 1024 } 1025 1026 /* 1027 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA 1028 * if no label specified, based on the partition id. Error out if no 1029 * label or device (with partition id) is specified. This is strictly 1030 * a convenience to match the default label created by newfs_hammer2, 1031 * our preference is that a label always be specified. 1032 * 1033 * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command 1034 * that does not specify a device, as long as some H2 label 1035 * has already been mounted from that device. This makes 1036 * mounting snapshots a lot easier. 1037 */ 1038 dev = devstr; 1039 label = strchr(devstr, '@'); 1040 if (label && ((label + 1) - dev) > done) { 1041 kprintf("hammer2: mount: bad label %s/%zd\n", devstr, done); 1042 return (EINVAL); 1043 } 1044 if (label == NULL || label[1] == 0) { 1045 char slice; 1046 1047 if (label == NULL) 1048 label = devstr + strlen(devstr); 1049 else 1050 *label = '\0'; /* clean up trailing @ */ 1051 1052 slice = label[-1]; 1053 switch(slice) { 1054 case 'a': 1055 label = "BOOT"; 1056 break; 1057 case 'd': 1058 label = "ROOT"; 1059 break; 1060 default: 1061 label = "DATA"; 1062 break; 1063 } 1064 } else { 1065 *label = '\0'; 1066 label++; 1067 } 1068 1069 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n", 1070 dev, label, (mp->mnt_flag & MNT_RDONLY)); 1071 1072 /* 1073 * HMP device mount 1074 * 1075 * If a path is specified and dev is not an empty string, lookup the 1076 * name and verify that it referes to a block device. 1077 * 1078 * If a path is specified and dev is an empty string we fall through 1079 * and locate the label in the hmp search. 1080 */ 1081 if (path && *dev != 0) { 1082 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 1083 if (error == 0) 1084 error = nlookup(&nd); 1085 if (error == 0) 1086 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 1087 nlookup_done(&nd); 1088 } else if (path == NULL) { 1089 /* root mount */ 1090 cdev_t cdev = kgetdiskbyname(dev); 1091 error = bdevvp(cdev, &devvp); 1092 if (error) 1093 kprintf("hammer2: cannot find '%s'\n", dev); 1094 } else { 1095 /* 1096 * We will locate the hmp using the label in the hmp loop. 1097 */ 1098 error = 0; 1099 } 1100 1101 /* 1102 * Make sure its a block device. Do not check to see if it is 1103 * already mounted until we determine that its a fresh H2 device. 1104 */ 1105 if (error == 0 && devvp) { 1106 vn_isdisk(devvp, &error); 1107 } 1108 1109 /* 1110 * Determine if the device has already been mounted. After this 1111 * check hmp will be non-NULL if we are doing the second or more 1112 * hammer2 mounts from the same device. 1113 */ 1114 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1115 if (devvp) { 1116 /* 1117 * Match the device. Due to the way devfs works, 1118 * we may not be able to directly match the vnode pointer, 1119 * so also check to see if the underlying device matches. 1120 */ 1121 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1122 if (hmp->devvp == devvp) 1123 break; 1124 if (devvp->v_rdev && 1125 hmp->devvp->v_rdev == devvp->v_rdev) { 1126 break; 1127 } 1128 } 1129 1130 /* 1131 * If no match this may be a fresh H2 mount, make sure 1132 * the device is not mounted on anything else. 1133 */ 1134 if (hmp == NULL) 1135 error = vfs_mountedon(devvp); 1136 } else if (error == 0) { 1137 /* 1138 * Match the label to a pmp already probed. 1139 */ 1140 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 1141 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 1142 if (pmp->pfs_names[i] && 1143 strcmp(pmp->pfs_names[i], label) == 0) { 1144 hmp = pmp->pfs_hmps[i]; 1145 break; 1146 } 1147 } 1148 if (hmp) 1149 break; 1150 } 1151 if (hmp == NULL) { 1152 lockmgr(&hammer2_mntlk, LK_RELEASE); 1153 kprintf("hammer2_mount: PFS label \"%s\" not found\n", 1154 label); 1155 return ENOENT; 1156 } 1157 } 1158 1159 /* 1160 * Open the device if this isn't a secondary mount and construct 1161 * the H2 device mount (hmp). 1162 */ 1163 if (hmp == NULL) { 1164 hammer2_chain_t *schain; 1165 hammer2_xid_t xid; 1166 hammer2_xop_head_t xop; 1167 1168 if (error == 0 && vcount(devvp) > 0) { 1169 kprintf("Primary device already has references\n"); 1170 error = EBUSY; 1171 } 1172 1173 /* 1174 * Now open the device 1175 */ 1176 if (error == 0) { 1177 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1178 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1179 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1180 if (error == 0) { 1181 error = VOP_OPEN(devvp, 1182 (ronly ? FREAD : FREAD | FWRITE), 1183 FSCRED, NULL); 1184 } 1185 vn_unlock(devvp); 1186 } 1187 if (error && devvp) { 1188 vrele(devvp); 1189 devvp = NULL; 1190 } 1191 if (error) { 1192 lockmgr(&hammer2_mntlk, LK_RELEASE); 1193 return error; 1194 } 1195 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1196 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1197 hmp->ronly = ronly; 1198 hmp->devvp = devvp; 1199 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1200 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1201 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1202 RB_INIT(&hmp->iotree); 1203 spin_init(&hmp->io_spin, "h2mount_io"); 1204 spin_init(&hmp->list_spin, "h2mount_list"); 1205 1206 lockinit(&hmp->vollk, "h2vol", 0, 0); 1207 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1208 lockinit(&hmp->bflock, "h2bflk", 0, 0); 1209 1210 /* 1211 * vchain setup. vchain.data is embedded. 1212 * vchain.refs is initialized and will never drop to 0. 1213 * 1214 * NOTE! voldata is not yet loaded. 1215 */ 1216 hmp->vchain.hmp = hmp; 1217 hmp->vchain.refs = 1; 1218 hmp->vchain.data = (void *)&hmp->voldata; 1219 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1220 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1221 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1222 hammer2_chain_core_init(&hmp->vchain); 1223 1224 /* 1225 * fchain setup. fchain.data is embedded. 1226 * fchain.refs is initialized and will never drop to 0. 1227 * 1228 * The data is not used but needs to be initialized to 1229 * pass assertion muster. We use this chain primarily 1230 * as a placeholder for the freemap's top-level RBTREE 1231 * so it does not interfere with the volume's topology 1232 * RBTREE. 1233 */ 1234 hmp->fchain.hmp = hmp; 1235 hmp->fchain.refs = 1; 1236 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1237 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1238 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1239 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1240 hmp->fchain.bref.methods = 1241 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1242 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1243 hammer2_chain_core_init(&hmp->fchain); 1244 1245 /* 1246 * Install the volume header and initialize fields from 1247 * voldata. 1248 */ 1249 error = hammer2_install_volume_header(hmp); 1250 if (error) { 1251 hammer2_unmount_helper(mp, NULL, hmp); 1252 lockmgr(&hammer2_mntlk, LK_RELEASE); 1253 hammer2_vfs_unmount(mp, MNT_FORCE); 1254 return error; 1255 } 1256 1257 /* 1258 * Really important to get these right or the flush and 1259 * teardown code will get confused. 1260 */ 1261 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1262 spmp = hmp->spmp; 1263 spmp->pfs_hmps[0] = hmp; 1264 1265 /* 1266 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1267 * is inherited from the volume header. 1268 */ 1269 xid = 0; 1270 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1271 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1272 hmp->vchain.pmp = spmp; 1273 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1274 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1275 hmp->fchain.pmp = spmp; 1276 1277 /* 1278 * First locate the super-root inode, which is key 0 1279 * relative to the volume header's blockset. 1280 * 1281 * Then locate the root inode by scanning the directory keyspace 1282 * represented by the label. 1283 */ 1284 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1285 schain = hammer2_chain_lookup(&parent, &key_dummy, 1286 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1287 &error, 0); 1288 hammer2_chain_lookup_done(parent); 1289 if (schain == NULL) { 1290 kprintf("hammer2_mount: invalid super-root\n"); 1291 hammer2_unmount_helper(mp, NULL, hmp); 1292 lockmgr(&hammer2_mntlk, LK_RELEASE); 1293 hammer2_vfs_unmount(mp, MNT_FORCE); 1294 return EINVAL; 1295 } 1296 if (schain->error) { 1297 kprintf("hammer2_mount: error %s reading super-root\n", 1298 hammer2_error_str(schain->error)); 1299 hammer2_chain_unlock(schain); 1300 hammer2_chain_drop(schain); 1301 schain = NULL; 1302 hammer2_unmount_helper(mp, NULL, hmp); 1303 lockmgr(&hammer2_mntlk, LK_RELEASE); 1304 hammer2_vfs_unmount(mp, MNT_FORCE); 1305 return EINVAL; 1306 } 1307 1308 /* 1309 * The super-root always uses an inode_tid of 1 when 1310 * creating PFSs. 1311 */ 1312 spmp->inode_tid = 1; 1313 spmp->modify_tid = schain->bref.modify_tid + 1; 1314 1315 /* 1316 * Sanity-check schain's pmp and finish initialization. 1317 * Any chain belonging to the super-root topology should 1318 * have a NULL pmp (not even set to spmp). 1319 */ 1320 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1321 KKASSERT(schain->pmp == NULL); 1322 spmp->pfs_clid = ripdata->meta.pfs_clid; 1323 1324 /* 1325 * Replace the dummy spmp->iroot with a real one. It's 1326 * easier to just do a wholesale replacement than to try 1327 * to update the chain and fixup the iroot fields. 1328 * 1329 * The returned inode is locked with the supplied cluster. 1330 */ 1331 hammer2_dummy_xop_from_chain(&xop, schain); 1332 hammer2_inode_drop(spmp->iroot); 1333 spmp->iroot = NULL; 1334 spmp->iroot = hammer2_inode_get(spmp, &xop, -1, -1); 1335 spmp->spmp_hmp = hmp; 1336 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1337 spmp->pfs_hmps[0] = hmp; 1338 hammer2_inode_ref(spmp->iroot); 1339 hammer2_inode_unlock(spmp->iroot); 1340 hammer2_cluster_unlock(&xop.cluster); 1341 hammer2_chain_drop(schain); 1342 /* do not call hammer2_cluster_drop() on an embedded cluster */ 1343 schain = NULL; /* now invalid */ 1344 /* leave spmp->iroot with one ref */ 1345 1346 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1347 error = hammer2_recovery(hmp); 1348 if (error == 0) 1349 error |= hammer2_fixup_pfses(hmp); 1350 /* XXX do something with error */ 1351 } 1352 hammer2_update_pmps(hmp); 1353 hammer2_iocom_init(hmp); 1354 hammer2_bulkfree_init(hmp); 1355 1356 /* 1357 * Ref the cluster management messaging descriptor. The mount 1358 * program deals with the other end of the communications pipe. 1359 * 1360 * Root mounts typically do not supply one. 1361 */ 1362 if (info.cluster_fd >= 0) { 1363 fp = holdfp(curthread, info.cluster_fd, -1); 1364 if (fp) { 1365 hammer2_cluster_reconnect(hmp, fp); 1366 } else { 1367 kprintf("hammer2_mount: bad cluster_fd!\n"); 1368 } 1369 } 1370 } else { 1371 spmp = hmp->spmp; 1372 if (info.hflags & HMNT2_DEVFLAGS) { 1373 kprintf("hammer2: Warning: mount flags pertaining " 1374 "to the whole device may only be specified " 1375 "on the first mount of the device: %08x\n", 1376 info.hflags & HMNT2_DEVFLAGS); 1377 } 1378 } 1379 1380 /* 1381 * Force local mount (disassociate all PFSs from their clusters). 1382 * Used primarily for debugging. 1383 */ 1384 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1385 1386 /* 1387 * Lookup the mount point under the media-localized super-root. 1388 * Scanning hammer2_pfslist doesn't help us because it represents 1389 * PFS cluster ids which can aggregate several named PFSs together. 1390 * 1391 * cluster->pmp will incorrectly point to spmp and must be fixed 1392 * up later on. 1393 */ 1394 hammer2_inode_lock(spmp->iroot, 0); 1395 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1396 lhc = hammer2_dirhash(label, strlen(label)); 1397 chain = hammer2_chain_lookup(&parent, &key_next, 1398 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1399 &error, 0); 1400 while (chain) { 1401 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1402 strcmp(label, chain->data->ipdata.filename) == 0) { 1403 break; 1404 } 1405 chain = hammer2_chain_next(&parent, chain, &key_next, 1406 key_next, 1407 lhc + HAMMER2_DIRHASH_LOMASK, 1408 &error, 0); 1409 } 1410 if (parent) { 1411 hammer2_chain_unlock(parent); 1412 hammer2_chain_drop(parent); 1413 } 1414 hammer2_inode_unlock(spmp->iroot); 1415 1416 /* 1417 * PFS could not be found? 1418 */ 1419 if (chain == NULL) { 1420 hammer2_unmount_helper(mp, NULL, hmp); 1421 lockmgr(&hammer2_mntlk, LK_RELEASE); 1422 hammer2_vfs_unmount(mp, MNT_FORCE); 1423 1424 if (error) { 1425 kprintf("hammer2_mount: PFS label I/O error\n"); 1426 return EINVAL; 1427 } else { 1428 kprintf("hammer2_mount: PFS label \"%s\" not found\n", 1429 label); 1430 return ENOENT; 1431 } 1432 } 1433 1434 /* 1435 * Acquire the pmp structure (it should have already been allocated 1436 * via hammer2_update_pmps() so do not pass cluster in to add to 1437 * available chains). 1438 * 1439 * Check if the cluster has already been mounted. A cluster can 1440 * only be mounted once, use null mounts to mount additional copies. 1441 */ 1442 if (chain->error) { 1443 kprintf("hammer2_mount: PFS label I/O error\n"); 1444 } else { 1445 ripdata = &chain->data->ipdata; 1446 bref = chain->bref; 1447 pmp = hammer2_pfsalloc(NULL, ripdata, 1448 bref.modify_tid, force_local); 1449 } 1450 hammer2_chain_unlock(chain); 1451 hammer2_chain_drop(chain); 1452 1453 /* 1454 * Finish the mount 1455 */ 1456 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1457 1458 if (pmp->mp) { 1459 kprintf("hammer2_mount: PFS already mounted!\n"); 1460 hammer2_unmount_helper(mp, NULL, hmp); 1461 lockmgr(&hammer2_mntlk, LK_RELEASE); 1462 hammer2_vfs_unmount(mp, MNT_FORCE); 1463 1464 return EBUSY; 1465 } 1466 1467 pmp->hflags = info.hflags; 1468 mp->mnt_flag |= MNT_LOCAL; 1469 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1470 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1471 1472 /* 1473 * required mount structure initializations 1474 */ 1475 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1476 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1477 1478 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1479 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1480 1481 /* 1482 * Optional fields 1483 */ 1484 mp->mnt_iosize_max = MAXPHYS; 1485 1486 /* 1487 * Connect up mount pointers. 1488 */ 1489 hammer2_mount_helper(mp, pmp); 1490 hmp->devvp->v_rdev->si_mountpoint = mp; 1491 1492 lockmgr(&hammer2_mntlk, LK_RELEASE); 1493 1494 /* 1495 * Finish setup 1496 */ 1497 vfs_getnewfsid(mp); 1498 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1499 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1500 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1501 1502 if (path) { 1503 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1504 MNAMELEN - 1, &size); 1505 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1506 } /* else root mount, already in there */ 1507 1508 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1509 if (path) { 1510 copyinstr(path, mp->mnt_stat.f_mntonname, 1511 sizeof(mp->mnt_stat.f_mntonname) - 1, 1512 &size); 1513 } else { 1514 /* root mount */ 1515 mp->mnt_stat.f_mntonname[0] = '/'; 1516 } 1517 1518 /* 1519 * Initial statfs to prime mnt_stat. 1520 */ 1521 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1522 1523 return 0; 1524 } 1525 1526 /* 1527 * Scan PFSs under the super-root and create hammer2_pfs structures. 1528 */ 1529 static 1530 void 1531 hammer2_update_pmps(hammer2_dev_t *hmp) 1532 { 1533 const hammer2_inode_data_t *ripdata; 1534 hammer2_chain_t *parent; 1535 hammer2_chain_t *chain; 1536 hammer2_blockref_t bref; 1537 hammer2_dev_t *force_local; 1538 hammer2_pfs_t *spmp; 1539 hammer2_pfs_t *pmp; 1540 hammer2_key_t key_next; 1541 int error; 1542 1543 /* 1544 * Force local mount (disassociate all PFSs from their clusters). 1545 * Used primarily for debugging. 1546 */ 1547 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1548 1549 /* 1550 * Lookup mount point under the media-localized super-root. 1551 * 1552 * cluster->pmp will incorrectly point to spmp and must be fixed 1553 * up later on. 1554 */ 1555 spmp = hmp->spmp; 1556 hammer2_inode_lock(spmp->iroot, 0); 1557 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1558 chain = hammer2_chain_lookup(&parent, &key_next, 1559 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1560 &error, 0); 1561 while (chain) { 1562 if (chain->error) { 1563 kprintf("I/O error scanning PFS labels\n"); 1564 } else if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) { 1565 kprintf("Non inode chain type %d under super-root\n", 1566 chain->bref.type); 1567 } else { 1568 ripdata = &chain->data->ipdata; 1569 bref = chain->bref; 1570 pmp = hammer2_pfsalloc(chain, ripdata, 1571 bref.modify_tid, force_local); 1572 } 1573 chain = hammer2_chain_next(&parent, chain, &key_next, 1574 key_next, HAMMER2_KEY_MAX, 1575 &error, 0); 1576 } 1577 if (parent) { 1578 hammer2_chain_unlock(parent); 1579 hammer2_chain_drop(parent); 1580 } 1581 hammer2_inode_unlock(spmp->iroot); 1582 } 1583 1584 static 1585 int 1586 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1587 struct vnode *devvp, struct ucred *cred) 1588 { 1589 int error; 1590 1591 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1592 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1593 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL); 1594 vn_unlock(devvp); 1595 error = hammer2_recovery(hmp); 1596 if (error == 0) 1597 error |= hammer2_fixup_pfses(hmp); 1598 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1599 if (error == 0) { 1600 VOP_CLOSE(devvp, FREAD, NULL); 1601 hmp->ronly = 0; 1602 } else { 1603 VOP_CLOSE(devvp, FREAD | FWRITE, NULL); 1604 } 1605 vn_unlock(devvp); 1606 } else { 1607 error = 0; 1608 } 1609 return error; 1610 } 1611 1612 static 1613 int 1614 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1615 { 1616 hammer2_pfs_t *pmp; 1617 int flags; 1618 int error = 0; 1619 1620 pmp = MPTOPMP(mp); 1621 1622 if (pmp == NULL) 1623 return(0); 1624 1625 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1626 1627 /* 1628 * If mount initialization proceeded far enough we must flush 1629 * its vnodes and sync the underlying mount points. Three syncs 1630 * are required to fully flush the filesystem (freemap updates lag 1631 * by one flush, and one extra for safety). 1632 */ 1633 if (mntflags & MNT_FORCE) 1634 flags = FORCECLOSE; 1635 else 1636 flags = 0; 1637 if (pmp->iroot) { 1638 error = vflush(mp, 0, flags); 1639 if (error) 1640 goto failed; 1641 hammer2_vfs_sync(mp, MNT_WAIT); 1642 hammer2_vfs_sync(mp, MNT_WAIT); 1643 hammer2_vfs_sync(mp, MNT_WAIT); 1644 } 1645 1646 /* 1647 * Cleanup the frontend support XOPS threads 1648 */ 1649 hammer2_xop_helper_cleanup(pmp); 1650 1651 if (pmp->mp) 1652 hammer2_unmount_helper(mp, pmp, NULL); 1653 1654 error = 0; 1655 failed: 1656 lockmgr(&hammer2_mntlk, LK_RELEASE); 1657 1658 return (error); 1659 } 1660 1661 /* 1662 * Mount helper, hook the system mount into our PFS. 1663 * The mount lock is held. 1664 * 1665 * We must bump the mount_count on related devices for any 1666 * mounted PFSs. 1667 */ 1668 static 1669 void 1670 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1671 { 1672 hammer2_cluster_t *cluster; 1673 hammer2_chain_t *rchain; 1674 int i; 1675 1676 mp->mnt_data = (qaddr_t)pmp; 1677 pmp->mp = mp; 1678 1679 /* 1680 * After pmp->mp is set we have to adjust hmp->mount_count. 1681 */ 1682 cluster = &pmp->iroot->cluster; 1683 for (i = 0; i < cluster->nchains; ++i) { 1684 rchain = cluster->array[i].chain; 1685 if (rchain == NULL) 1686 continue; 1687 ++rchain->hmp->mount_count; 1688 } 1689 1690 /* 1691 * Create missing Xop threads 1692 */ 1693 hammer2_xop_helper_create(pmp); 1694 } 1695 1696 /* 1697 * Mount helper, unhook the system mount from our PFS. 1698 * The mount lock is held. 1699 * 1700 * If hmp is supplied a mount responsible for being the first to open 1701 * the block device failed and the block device and all PFSs using the 1702 * block device must be cleaned up. 1703 * 1704 * If pmp is supplied multiple devices might be backing the PFS and each 1705 * must be disconnected. This might not be the last PFS using some of the 1706 * underlying devices. Also, we have to adjust our hmp->mount_count 1707 * accounting for the devices backing the pmp which is now undergoing an 1708 * unmount. 1709 */ 1710 static 1711 void 1712 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1713 { 1714 hammer2_cluster_t *cluster; 1715 hammer2_chain_t *rchain; 1716 struct vnode *devvp; 1717 int dumpcnt; 1718 int ronly; 1719 int i; 1720 1721 /* 1722 * If no device supplied this is a high-level unmount and we have to 1723 * to disconnect the mount, adjust mount_count, and locate devices 1724 * that might now have no mounts. 1725 */ 1726 if (pmp) { 1727 KKASSERT(hmp == NULL); 1728 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1729 pmp->mp = NULL; 1730 mp->mnt_data = NULL; 1731 1732 /* 1733 * After pmp->mp is cleared we have to account for 1734 * mount_count. 1735 */ 1736 cluster = &pmp->iroot->cluster; 1737 for (i = 0; i < cluster->nchains; ++i) { 1738 rchain = cluster->array[i].chain; 1739 if (rchain == NULL) 1740 continue; 1741 --rchain->hmp->mount_count; 1742 /* scrapping hmp now may invalidate the pmp */ 1743 } 1744 again: 1745 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1746 if (hmp->mount_count == 0) { 1747 hammer2_unmount_helper(NULL, NULL, hmp); 1748 goto again; 1749 } 1750 } 1751 return; 1752 } 1753 1754 /* 1755 * Try to terminate the block device. We can't terminate it if 1756 * there are still PFSs referencing it. 1757 */ 1758 if (hmp->mount_count) 1759 return; 1760 1761 /* 1762 * Decomission the network before we start messing with the 1763 * device and PFS. 1764 */ 1765 hammer2_iocom_uninit(hmp); 1766 1767 hammer2_bulkfree_uninit(hmp); 1768 hammer2_pfsfree_scan(hmp, 0); 1769 #if 0 1770 hammer2_dev_exlock(hmp); /* XXX order */ 1771 #endif 1772 1773 /* 1774 * Cycle the volume data lock as a safety (probably not needed any 1775 * more). To ensure everything is out we need to flush at least 1776 * three times. (1) The running of the sideq can dirty the 1777 * filesystem, (2) A normal flush can dirty the freemap, and 1778 * (3) ensure that the freemap is fully synchronized. 1779 * 1780 * The next mount's recovery scan can clean everything up but we want 1781 * to leave the filesystem in a 100% clean state on a normal unmount. 1782 */ 1783 #if 0 1784 hammer2_voldata_lock(hmp); 1785 hammer2_voldata_unlock(hmp); 1786 #endif 1787 1788 /* 1789 * Flush whatever is left. Unmounted but modified PFS's might still 1790 * have some dirty chains on them. 1791 */ 1792 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS); 1793 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS); 1794 1795 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1796 hammer2_voldata_modify(hmp); 1797 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP | 1798 HAMMER2_FLUSH_ALL); 1799 } 1800 hammer2_chain_unlock(&hmp->fchain); 1801 1802 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1803 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP | 1804 HAMMER2_FLUSH_ALL); 1805 } 1806 hammer2_chain_unlock(&hmp->vchain); 1807 1808 if ((hmp->vchain.flags | hmp->fchain.flags) & 1809 HAMMER2_CHAIN_FLUSH_MASK) { 1810 kprintf("hammer2_unmount: chains left over after final sync\n"); 1811 kprintf(" vchain %08x\n", hmp->vchain.flags); 1812 kprintf(" fchain %08x\n", hmp->fchain.flags); 1813 1814 if (hammer2_debug & 0x0010) 1815 Debugger("entered debugger"); 1816 } 1817 1818 hammer2_pfsfree_scan(hmp, 1); 1819 1820 KKASSERT(hmp->spmp == NULL); 1821 1822 /* 1823 * Finish up with the device vnode 1824 */ 1825 if ((devvp = hmp->devvp) != NULL) { 1826 ronly = hmp->ronly; 1827 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1828 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n", 1829 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree), 1830 ronly); 1831 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1832 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n", 1833 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree)); 1834 devvp->v_rdev->si_mountpoint = NULL; 1835 hmp->devvp = NULL; 1836 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1837 vn_unlock(devvp); 1838 vrele(devvp); 1839 devvp = NULL; 1840 } 1841 1842 /* 1843 * Clear vchain/fchain flags that might prevent final cleanup 1844 * of these chains. 1845 */ 1846 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1847 atomic_add_long(&hammer2_count_modified_chains, -1); 1848 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1849 hammer2_pfs_memory_wakeup(hmp->vchain.pmp, -1); 1850 } 1851 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1852 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1853 } 1854 1855 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1856 atomic_add_long(&hammer2_count_modified_chains, -1); 1857 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1858 hammer2_pfs_memory_wakeup(hmp->fchain.pmp, -1); 1859 } 1860 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1861 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1862 } 1863 1864 /* 1865 * Final drop of embedded freemap root chain to 1866 * clean up fchain.core (fchain structure is not 1867 * flagged ALLOCATED so it is cleaned out and then 1868 * left to rot). 1869 */ 1870 hammer2_chain_drop(&hmp->fchain); 1871 1872 /* 1873 * Final drop of embedded volume root chain to clean 1874 * up vchain.core (vchain structure is not flagged 1875 * ALLOCATED so it is cleaned out and then left to 1876 * rot). 1877 */ 1878 dumpcnt = 50; 1879 hammer2_dump_chain(&hmp->vchain, 0, 0, &dumpcnt, 'v', (u_int)-1); 1880 dumpcnt = 50; 1881 hammer2_dump_chain(&hmp->fchain, 0, 0, &dumpcnt, 'f', (u_int)-1); 1882 #if 0 1883 hammer2_dev_unlock(hmp); 1884 #endif 1885 hammer2_chain_drop(&hmp->vchain); 1886 1887 hammer2_io_cleanup(hmp, &hmp->iotree); 1888 if (hmp->iofree_count) { 1889 kprintf("io_cleanup: %d I/O's left hanging\n", 1890 hmp->iofree_count); 1891 } 1892 1893 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1894 kmalloc_destroy(&hmp->mchain); 1895 kfree(hmp, M_HAMMER2); 1896 } 1897 1898 int 1899 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1900 ino_t ino, struct vnode **vpp) 1901 { 1902 hammer2_xop_lookup_t *xop; 1903 hammer2_pfs_t *pmp; 1904 hammer2_inode_t *ip; 1905 hammer2_tid_t inum; 1906 int error; 1907 1908 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1909 1910 error = 0; 1911 pmp = MPTOPMP(mp); 1912 1913 /* 1914 * Easy if we already have it cached 1915 */ 1916 ip = hammer2_inode_lookup(pmp, inum); 1917 if (ip) { 1918 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1919 *vpp = hammer2_igetv(ip, &error); 1920 hammer2_inode_unlock(ip); 1921 hammer2_inode_drop(ip); /* from lookup */ 1922 1923 return error; 1924 } 1925 1926 /* 1927 * Otherwise we have to find the inode 1928 */ 1929 xop = hammer2_xop_alloc(pmp->iroot, 0); 1930 xop->lhc = inum; 1931 hammer2_xop_start(&xop->head, &hammer2_lookup_desc); 1932 error = hammer2_xop_collect(&xop->head, 0); 1933 1934 if (error == 0) 1935 ip = hammer2_inode_get(pmp, &xop->head, -1, -1); 1936 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1937 1938 if (ip) { 1939 *vpp = hammer2_igetv(ip, &error); 1940 hammer2_inode_unlock(ip); 1941 } else { 1942 *vpp = NULL; 1943 error = ENOENT; 1944 } 1945 return (error); 1946 } 1947 1948 static 1949 int 1950 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1951 { 1952 hammer2_pfs_t *pmp; 1953 struct vnode *vp; 1954 int error; 1955 1956 pmp = MPTOPMP(mp); 1957 if (pmp->iroot == NULL) { 1958 kprintf("hammer2 (%s): no root inode\n", 1959 mp->mnt_stat.f_mntfromname); 1960 *vpp = NULL; 1961 return EINVAL; 1962 } 1963 1964 error = 0; 1965 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1966 1967 while (pmp->inode_tid == 0) { 1968 hammer2_xop_ipcluster_t *xop; 1969 const hammer2_inode_meta_t *meta; 1970 1971 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1972 hammer2_xop_start(&xop->head, &hammer2_ipcluster_desc); 1973 error = hammer2_xop_collect(&xop->head, 0); 1974 1975 if (error == 0) { 1976 meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta; 1977 pmp->iroot->meta = *meta; 1978 pmp->inode_tid = meta->pfs_inum + 1; 1979 hammer2_xop_pdata(&xop->head); 1980 /* meta invalid */ 1981 1982 if (pmp->inode_tid < HAMMER2_INODE_START) 1983 pmp->inode_tid = HAMMER2_INODE_START; 1984 pmp->modify_tid = 1985 xop->head.cluster.focus->bref.modify_tid + 1; 1986 #if 0 1987 kprintf("PFS: Starting inode %jd\n", 1988 (intmax_t)pmp->inode_tid); 1989 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1990 pmp->inode_tid, pmp->modify_tid); 1991 #endif 1992 wakeup(&pmp->iroot); 1993 1994 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1995 1996 /* 1997 * Prime the mount info. 1998 */ 1999 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 2000 break; 2001 } 2002 2003 /* 2004 * Loop, try again 2005 */ 2006 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2007 hammer2_inode_unlock(pmp->iroot); 2008 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 2009 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 2010 if (error == EINTR) 2011 break; 2012 } 2013 2014 if (error) { 2015 hammer2_inode_unlock(pmp->iroot); 2016 *vpp = NULL; 2017 } else { 2018 vp = hammer2_igetv(pmp->iroot, &error); 2019 hammer2_inode_unlock(pmp->iroot); 2020 *vpp = vp; 2021 } 2022 2023 return (error); 2024 } 2025 2026 /* 2027 * Filesystem status 2028 * 2029 * XXX incorporate ipdata->meta.inode_quota and data_quota 2030 */ 2031 static 2032 int 2033 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 2034 { 2035 hammer2_pfs_t *pmp; 2036 hammer2_dev_t *hmp; 2037 hammer2_blockref_t bref; 2038 struct statfs tmp; 2039 int i; 2040 2041 /* 2042 * NOTE: iroot might not have validated the cluster yet. 2043 */ 2044 pmp = MPTOPMP(mp); 2045 2046 bzero(&tmp, sizeof(tmp)); 2047 2048 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2049 hmp = pmp->pfs_hmps[i]; 2050 if (hmp == NULL) 2051 continue; 2052 if (pmp->iroot->cluster.array[i].chain) 2053 bref = pmp->iroot->cluster.array[i].chain->bref; 2054 else 2055 bzero(&bref, sizeof(bref)); 2056 2057 tmp.f_files = bref.embed.stats.inode_count; 2058 tmp.f_ffree = 0; 2059 tmp.f_blocks = hmp->voldata.allocator_size / 2060 mp->mnt_vstat.f_bsize; 2061 tmp.f_bfree = hmp->voldata.allocator_free / 2062 mp->mnt_vstat.f_bsize; 2063 tmp.f_bavail = tmp.f_bfree; 2064 2065 if (cred && cred->cr_uid != 0) { 2066 uint64_t adj; 2067 2068 /* 5% */ 2069 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2070 tmp.f_blocks -= adj; 2071 tmp.f_bfree -= adj; 2072 tmp.f_bavail -= adj; 2073 } 2074 2075 mp->mnt_stat.f_blocks = tmp.f_blocks; 2076 mp->mnt_stat.f_bfree = tmp.f_bfree; 2077 mp->mnt_stat.f_bavail = tmp.f_bavail; 2078 mp->mnt_stat.f_files = tmp.f_files; 2079 mp->mnt_stat.f_ffree = tmp.f_ffree; 2080 2081 *sbp = mp->mnt_stat; 2082 } 2083 return (0); 2084 } 2085 2086 static 2087 int 2088 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 2089 { 2090 hammer2_pfs_t *pmp; 2091 hammer2_dev_t *hmp; 2092 hammer2_blockref_t bref; 2093 struct statvfs tmp; 2094 int i; 2095 2096 /* 2097 * NOTE: iroot might not have validated the cluster yet. 2098 */ 2099 pmp = MPTOPMP(mp); 2100 bzero(&tmp, sizeof(tmp)); 2101 2102 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2103 hmp = pmp->pfs_hmps[i]; 2104 if (hmp == NULL) 2105 continue; 2106 if (pmp->iroot->cluster.array[i].chain) 2107 bref = pmp->iroot->cluster.array[i].chain->bref; 2108 else 2109 bzero(&bref, sizeof(bref)); 2110 2111 tmp.f_files = bref.embed.stats.inode_count; 2112 tmp.f_ffree = 0; 2113 tmp.f_blocks = hmp->voldata.allocator_size / 2114 mp->mnt_vstat.f_bsize; 2115 tmp.f_bfree = hmp->voldata.allocator_free / 2116 mp->mnt_vstat.f_bsize; 2117 tmp.f_bavail = tmp.f_bfree; 2118 2119 if (cred && cred->cr_uid != 0) { 2120 uint64_t adj; 2121 2122 /* 5% */ 2123 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2124 tmp.f_blocks -= adj; 2125 tmp.f_bfree -= adj; 2126 tmp.f_bavail -= adj; 2127 } 2128 2129 mp->mnt_vstat.f_blocks = tmp.f_blocks; 2130 mp->mnt_vstat.f_bfree = tmp.f_bfree; 2131 mp->mnt_vstat.f_bavail = tmp.f_bavail; 2132 mp->mnt_vstat.f_files = tmp.f_files; 2133 mp->mnt_vstat.f_ffree = tmp.f_ffree; 2134 2135 *sbp = mp->mnt_vstat; 2136 } 2137 return (0); 2138 } 2139 2140 /* 2141 * Mount-time recovery (RW mounts) 2142 * 2143 * Updates to the free block table are allowed to lag flushes by one 2144 * transaction. In case of a crash, then on a fresh mount we must do an 2145 * incremental scan of the last committed transaction id and make sure that 2146 * all related blocks have been marked allocated. 2147 */ 2148 struct hammer2_recovery_elm { 2149 TAILQ_ENTRY(hammer2_recovery_elm) entry; 2150 hammer2_chain_t *chain; 2151 hammer2_tid_t sync_tid; 2152 }; 2153 2154 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 2155 2156 struct hammer2_recovery_info { 2157 struct hammer2_recovery_list list; 2158 hammer2_tid_t mtid; 2159 int depth; 2160 }; 2161 2162 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 2163 hammer2_chain_t *parent, 2164 struct hammer2_recovery_info *info, 2165 hammer2_tid_t sync_tid); 2166 2167 #define HAMMER2_RECOVERY_MAXDEPTH 10 2168 2169 static 2170 int 2171 hammer2_recovery(hammer2_dev_t *hmp) 2172 { 2173 struct hammer2_recovery_info info; 2174 struct hammer2_recovery_elm *elm; 2175 hammer2_chain_t *parent; 2176 hammer2_tid_t sync_tid; 2177 hammer2_tid_t mirror_tid; 2178 int error; 2179 2180 hammer2_trans_init(hmp->spmp, 0); 2181 2182 sync_tid = hmp->voldata.freemap_tid; 2183 mirror_tid = hmp->voldata.mirror_tid; 2184 2185 kprintf("hammer2_mount \"%s\": ", hmp->devrepname); 2186 if (sync_tid >= mirror_tid) { 2187 kprintf("no recovery needed\n"); 2188 } else { 2189 kprintf("freemap recovery %016jx-%016jx\n", 2190 sync_tid + 1, mirror_tid); 2191 } 2192 2193 TAILQ_INIT(&info.list); 2194 info.depth = 0; 2195 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 2196 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 2197 hammer2_chain_lookup_done(parent); 2198 2199 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 2200 TAILQ_REMOVE(&info.list, elm, entry); 2201 parent = elm->chain; 2202 sync_tid = elm->sync_tid; 2203 kfree(elm, M_HAMMER2); 2204 2205 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2206 error |= hammer2_recovery_scan(hmp, parent, &info, 2207 hmp->voldata.freemap_tid); 2208 hammer2_chain_unlock(parent); 2209 hammer2_chain_drop(parent); /* drop elm->chain ref */ 2210 } 2211 2212 hammer2_trans_done(hmp->spmp, 0); 2213 2214 return error; 2215 } 2216 2217 static 2218 int 2219 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 2220 struct hammer2_recovery_info *info, 2221 hammer2_tid_t sync_tid) 2222 { 2223 const hammer2_inode_data_t *ripdata; 2224 hammer2_chain_t *chain; 2225 hammer2_blockref_t bref; 2226 int tmp_error; 2227 int rup_error; 2228 int error; 2229 int first; 2230 2231 /* 2232 * Adjust freemap to ensure that the block(s) are marked allocated. 2233 */ 2234 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2235 hammer2_freemap_adjust(hmp, &parent->bref, 2236 HAMMER2_FREEMAP_DORECOVER); 2237 } 2238 2239 /* 2240 * Check type for recursive scan 2241 */ 2242 switch(parent->bref.type) { 2243 case HAMMER2_BREF_TYPE_VOLUME: 2244 /* data already instantiated */ 2245 break; 2246 case HAMMER2_BREF_TYPE_INODE: 2247 /* 2248 * Must instantiate data for DIRECTDATA test and also 2249 * for recursion. 2250 */ 2251 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2252 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2253 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2254 /* not applicable to recovery scan */ 2255 hammer2_chain_unlock(parent); 2256 return 0; 2257 } 2258 hammer2_chain_unlock(parent); 2259 break; 2260 case HAMMER2_BREF_TYPE_INDIRECT: 2261 /* 2262 * Must instantiate data for recursion 2263 */ 2264 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2265 hammer2_chain_unlock(parent); 2266 break; 2267 case HAMMER2_BREF_TYPE_DIRENT: 2268 case HAMMER2_BREF_TYPE_DATA: 2269 case HAMMER2_BREF_TYPE_FREEMAP: 2270 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2271 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2272 /* not applicable to recovery scan */ 2273 return 0; 2274 break; 2275 default: 2276 return HAMMER2_ERROR_BADBREF; 2277 } 2278 2279 /* 2280 * Defer operation if depth limit reached. 2281 */ 2282 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2283 struct hammer2_recovery_elm *elm; 2284 2285 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2286 elm->chain = parent; 2287 elm->sync_tid = sync_tid; 2288 hammer2_chain_ref(parent); 2289 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2290 /* unlocked by caller */ 2291 2292 return(0); 2293 } 2294 2295 2296 /* 2297 * Recursive scan of the last flushed transaction only. We are 2298 * doing this without pmp assignments so don't leave the chains 2299 * hanging around after we are done with them. 2300 * 2301 * error Cumulative error this level only 2302 * rup_error Cumulative error for recursion 2303 * tmp_error Specific non-cumulative recursion error 2304 */ 2305 chain = NULL; 2306 first = 1; 2307 rup_error = 0; 2308 error = 0; 2309 2310 for (;;) { 2311 error |= hammer2_chain_scan(parent, &chain, &bref, 2312 &first, 2313 HAMMER2_LOOKUP_NODATA); 2314 2315 /* 2316 * Problem during scan or EOF 2317 */ 2318 if (error) 2319 break; 2320 2321 /* 2322 * If this is a leaf 2323 */ 2324 if (chain == NULL) { 2325 if (bref.mirror_tid > sync_tid) { 2326 hammer2_freemap_adjust(hmp, &bref, 2327 HAMMER2_FREEMAP_DORECOVER); 2328 } 2329 continue; 2330 } 2331 2332 /* 2333 * This may or may not be a recursive node. 2334 */ 2335 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2336 if (bref.mirror_tid > sync_tid) { 2337 ++info->depth; 2338 tmp_error = hammer2_recovery_scan(hmp, chain, 2339 info, sync_tid); 2340 --info->depth; 2341 } else { 2342 tmp_error = 0; 2343 } 2344 2345 /* 2346 * Flush the recovery at the PFS boundary to stage it for 2347 * the final flush of the super-root topology. 2348 */ 2349 if (tmp_error == 0 && 2350 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2351 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2352 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2353 HAMMER2_FLUSH_ALL); 2354 } 2355 rup_error |= tmp_error; 2356 } 2357 return ((error | rup_error) & ~HAMMER2_ERROR_EOF); 2358 } 2359 2360 /* 2361 * This fixes up an error introduced in earlier H2 implementations where 2362 * moving a PFS inode into an indirect block wound up causing the 2363 * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared. 2364 */ 2365 static 2366 int 2367 hammer2_fixup_pfses(hammer2_dev_t *hmp) 2368 { 2369 const hammer2_inode_data_t *ripdata; 2370 hammer2_chain_t *parent; 2371 hammer2_chain_t *chain; 2372 hammer2_key_t key_next; 2373 hammer2_pfs_t *spmp; 2374 int error; 2375 2376 error = 0; 2377 2378 /* 2379 * Lookup mount point under the media-localized super-root. 2380 * 2381 * cluster->pmp will incorrectly point to spmp and must be fixed 2382 * up later on. 2383 */ 2384 spmp = hmp->spmp; 2385 hammer2_inode_lock(spmp->iroot, 0); 2386 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 2387 chain = hammer2_chain_lookup(&parent, &key_next, 2388 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 2389 &error, 0); 2390 while (chain) { 2391 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 2392 continue; 2393 if (chain->error) { 2394 kprintf("I/O error scanning PFS labels\n"); 2395 error |= chain->error; 2396 } else if ((chain->bref.flags & 2397 HAMMER2_BREF_FLAG_PFSROOT) == 0) { 2398 int error2; 2399 2400 ripdata = &chain->data->ipdata; 2401 hammer2_trans_init(hmp->spmp, 0); 2402 error2 = hammer2_chain_modify(chain, 2403 chain->bref.modify_tid, 2404 0, 0); 2405 if (error2 == 0) { 2406 kprintf("hammer2: Correct mis-flagged PFS %s\n", 2407 ripdata->filename); 2408 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT; 2409 } else { 2410 error |= error2; 2411 } 2412 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2413 HAMMER2_FLUSH_ALL); 2414 hammer2_trans_done(hmp->spmp, 0); 2415 } 2416 chain = hammer2_chain_next(&parent, chain, &key_next, 2417 key_next, HAMMER2_KEY_MAX, 2418 &error, 0); 2419 } 2420 if (parent) { 2421 hammer2_chain_unlock(parent); 2422 hammer2_chain_drop(parent); 2423 } 2424 hammer2_inode_unlock(spmp->iroot); 2425 2426 return error; 2427 } 2428 2429 /* 2430 * Sync a mount point; this is called periodically on a per-mount basis from 2431 * the filesystem syncer, and whenever a user issues a sync. 2432 */ 2433 int 2434 hammer2_vfs_sync(struct mount *mp, int waitfor) 2435 { 2436 int error; 2437 2438 error = hammer2_vfs_sync_pmp(MPTOPMP(mp), waitfor); 2439 2440 return error; 2441 } 2442 2443 /* 2444 * Because frontend operations lock vnodes before we get a chance to 2445 * lock the related inode, we can't just acquire a vnode lock without 2446 * risking a deadlock. The frontend may be holding a vnode lock while 2447 * also blocked on our SYNCQ flag while trying to get the inode lock. 2448 * 2449 * To deal with this situation we can check the vnode lock situation 2450 * after locking the inode and perform a work-around. 2451 */ 2452 int 2453 hammer2_vfs_sync_pmp(hammer2_pfs_t *pmp, int waitfor) 2454 { 2455 struct mount *mp; 2456 /*hammer2_xop_flush_t *xop;*/ 2457 /*struct hammer2_sync_info info;*/ 2458 hammer2_inode_t *ip; 2459 hammer2_depend_t *depend; 2460 hammer2_depend_t *depend_next; 2461 struct vnode *vp; 2462 uint32_t pass2; 2463 int error; 2464 int wakecount; 2465 int dorestart; 2466 2467 mp = pmp->mp; 2468 2469 /* 2470 * Move all inodes on sideq to syncq. This will clear sideq. 2471 * This should represent all flushable inodes. These inodes 2472 * will already have refs due to being on syncq or sideq. We 2473 * must do this all at once with the spinlock held to ensure that 2474 * all inode dependencies are part of the same flush. 2475 * 2476 * We should be able to do this asynchronously from frontend 2477 * operations because we will be locking the inodes later on 2478 * to actually flush them, and that will partition any frontend 2479 * op using the same inode. Either it has already locked the 2480 * inode and we will block, or it has not yet locked the inode 2481 * and it will block until we are finished flushing that inode. 2482 * 2483 * When restarting, only move the inodes flagged as PASS2 from 2484 * SIDEQ to SYNCQ. PASS2 propagation by inode_lock4() and 2485 * inode_depend() are atomic with the spin-lock. 2486 */ 2487 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2488 #ifdef HAMMER2_DEBUG_SYNC 2489 kprintf("FILESYSTEM SYNC BOUNDARY\n"); 2490 #endif 2491 dorestart = 0; 2492 2493 /* 2494 * Move inodes from depq to syncq, releasing the related 2495 * depend structures. 2496 */ 2497 restart: 2498 #ifdef HAMMER2_DEBUG_SYNC 2499 kprintf("FILESYSTEM SYNC RESTART (%d)\n", dorestart); 2500 #endif 2501 hammer2_trans_setflags(pmp, 0/*HAMMER2_TRANS_COPYQ*/); 2502 hammer2_trans_clearflags(pmp, HAMMER2_TRANS_RESCAN); 2503 2504 /* 2505 * Move inodes from depq to syncq. When restarting, only depq's 2506 * marked pass2 are moved. 2507 */ 2508 hammer2_spin_ex(&pmp->list_spin); 2509 depend_next = TAILQ_FIRST(&pmp->depq); 2510 wakecount = 0; 2511 2512 while ((depend = depend_next) != NULL) { 2513 depend_next = TAILQ_NEXT(depend, entry); 2514 if (dorestart && depend->pass2 == 0) 2515 continue; 2516 TAILQ_FOREACH(ip, &depend->sideq, entry) { 2517 KKASSERT(ip->flags & HAMMER2_INODE_SIDEQ); 2518 atomic_set_int(&ip->flags, HAMMER2_INODE_SYNCQ); 2519 atomic_clear_int(&ip->flags, HAMMER2_INODE_SIDEQ); 2520 ip->depend = NULL; 2521 } 2522 2523 /* 2524 * NOTE: pmp->sideq_count includes both sideq and syncq 2525 */ 2526 TAILQ_CONCAT(&pmp->syncq, &depend->sideq, entry); 2527 2528 depend->count = 0; 2529 depend->pass2 = 0; 2530 TAILQ_REMOVE(&pmp->depq, depend, entry); 2531 } 2532 2533 hammer2_spin_unex(&pmp->list_spin); 2534 hammer2_trans_clearflags(pmp, /*HAMMER2_TRANS_COPYQ |*/ 2535 HAMMER2_TRANS_WAITING); 2536 dorestart = 0; 2537 2538 /* 2539 * sideq_count may have dropped enough to allow us to unstall 2540 * the frontend. 2541 */ 2542 hammer2_pfs_memory_wakeup(pmp, 0); 2543 2544 /* 2545 * Now run through all inodes on syncq. 2546 * 2547 * Flush transactions only interlock with other flush transactions. 2548 * Any conflicting frontend operations will block on the inode, but 2549 * may hold a vnode lock while doing so. 2550 */ 2551 hammer2_spin_ex(&pmp->list_spin); 2552 while ((ip = TAILQ_FIRST(&pmp->syncq)) != NULL) { 2553 /* 2554 * Remove the inode from the SYNCQ, transfer the syncq ref 2555 * to us. We must clear SYNCQ to allow any potential 2556 * front-end deadlock to proceed. We must set PASS2 so 2557 * the dependency code knows what to do. 2558 */ 2559 pass2 = ip->flags; 2560 cpu_ccfence(); 2561 if (atomic_cmpset_int(&ip->flags, 2562 pass2, 2563 (pass2 & ~(HAMMER2_INODE_SYNCQ | 2564 HAMMER2_INODE_SYNCQ_WAKEUP)) | 2565 HAMMER2_INODE_SYNCQ_PASS2) == 0) { 2566 continue; 2567 } 2568 TAILQ_REMOVE(&pmp->syncq, ip, entry); 2569 --pmp->sideq_count; 2570 hammer2_spin_unex(&pmp->list_spin); 2571 2572 /* 2573 * Tickle anyone waiting on ip->flags or the hysteresis 2574 * on the dirty inode count. 2575 */ 2576 if (pass2 & HAMMER2_INODE_SYNCQ_WAKEUP) 2577 wakeup(&ip->flags); 2578 if (++wakecount >= hammer2_limit_dirty_inodes / 20 + 1) { 2579 wakecount = 0; 2580 hammer2_pfs_memory_wakeup(pmp, 0); 2581 } 2582 2583 /* 2584 * Relock the inode, and we inherit a ref from the above. 2585 * We will check for a race after we acquire the vnode. 2586 */ 2587 hammer2_mtx_ex(&ip->lock); 2588 2589 /* 2590 * We need the vp in order to vfsync() dirty buffers, so if 2591 * one isn't attached we can skip it. 2592 * 2593 * Ordering the inode lock and then the vnode lock has the 2594 * potential to deadlock. If we had left SYNCQ set that could 2595 * also deadlock us against the frontend even if we don't hold 2596 * any locks, but the latter is not a problem now since we 2597 * cleared it. igetv will temporarily release the inode lock 2598 * in a safe manner to work-around the deadlock. 2599 * 2600 * Unfortunately it is still possible to deadlock when the 2601 * frontend obtains multiple inode locks, because all the 2602 * related vnodes are already locked (nor can the vnode locks 2603 * be released and reacquired without messing up RECLAIM and 2604 * INACTIVE sequencing). 2605 * 2606 * The solution for now is to move the vp back onto SIDEQ 2607 * and set dorestart, which will restart the flush after we 2608 * exhaust the current SYNCQ. Note that additional 2609 * dependencies may build up, so we definitely need to move 2610 * the whole SIDEQ back to SYNCQ when we restart. 2611 */ 2612 vp = ip->vp; 2613 if (vp) { 2614 if (vget(vp, LK_EXCLUSIVE|LK_NOWAIT)) { 2615 /* 2616 * Failed to get the vnode, requeue the inode 2617 * (PASS2 is already set so it will be found 2618 * again on the restart). 2619 * 2620 * Then unlock, possibly sleep, and retry 2621 * later. We sleep if PASS2 was *previously* 2622 * set, before we set it again above. 2623 */ 2624 vp = NULL; 2625 dorestart = 1; 2626 #ifdef HAMMER2_DEBUG_SYNC 2627 kprintf("inum %ld (sync delayed by vnode)\n", 2628 (long)ip->meta.inum); 2629 #endif 2630 hammer2_inode_delayed_sideq(ip); 2631 2632 hammer2_mtx_unlock(&ip->lock); 2633 hammer2_inode_drop(ip); 2634 2635 if (pass2 & HAMMER2_INODE_SYNCQ_PASS2) { 2636 tsleep(&dorestart, 0, "h2syndel", 2); 2637 } 2638 hammer2_spin_ex(&pmp->list_spin); 2639 continue; 2640 } 2641 } else { 2642 vp = NULL; 2643 } 2644 2645 /* 2646 * If the inode wound up on a SIDEQ again it will already be 2647 * prepped for another PASS2. In this situation if we flush 2648 * it now we will just wind up flushing it again in the same 2649 * syncer run, so we might as well not flush it now. 2650 */ 2651 if (ip->flags & HAMMER2_INODE_SIDEQ) { 2652 hammer2_mtx_unlock(&ip->lock); 2653 hammer2_inode_drop(ip); 2654 if (vp) 2655 vput(vp); 2656 dorestart = 1; 2657 hammer2_spin_ex(&pmp->list_spin); 2658 continue; 2659 } 2660 2661 /* 2662 * Ok we have the inode exclusively locked and if vp is 2663 * not NULL that will also be exclusively locked. Do the 2664 * meat of the flush. 2665 * 2666 * vp token needed for v_rbdirty_tree check / vclrisdirty 2667 * sequencing. Though we hold the vnode exclusively so 2668 * we shouldn't need to hold the token also in this case. 2669 */ 2670 if (vp) { 2671 vfsync(vp, MNT_WAIT, 1, NULL, NULL); 2672 bio_track_wait(&vp->v_track_write, 0, 0); /* XXX */ 2673 } 2674 2675 /* 2676 * If the inode has not yet been inserted into the tree 2677 * we must do so. Then sync and flush it. The flush should 2678 * update the parent. 2679 */ 2680 if (ip->flags & HAMMER2_INODE_DELETING) { 2681 #ifdef HAMMER2_DEBUG_SYNC 2682 kprintf("inum %ld destroy\n", (long)ip->meta.inum); 2683 #endif 2684 hammer2_inode_chain_des(ip); 2685 atomic_add_long(&hammer2_iod_inode_deletes, 1); 2686 } else if (ip->flags & HAMMER2_INODE_CREATING) { 2687 #ifdef HAMMER2_DEBUG_SYNC 2688 kprintf("inum %ld insert\n", (long)ip->meta.inum); 2689 #endif 2690 hammer2_inode_chain_ins(ip); 2691 atomic_add_long(&hammer2_iod_inode_creates, 1); 2692 } 2693 #ifdef HAMMER2_DEBUG_SYNC 2694 kprintf("inum %ld chain-sync\n", (long)ip->meta.inum); 2695 #endif 2696 2697 /* 2698 * Because I kinda messed up the design and index the inodes 2699 * under the root inode, along side the directory entries, 2700 * we can't flush the inode index under the iroot until the 2701 * end. If we do it now we might miss effects created by 2702 * other inodes on the SYNCQ. 2703 * 2704 * Do a normal (non-FSSYNC) flush instead, which allows the 2705 * vnode code to work the same. We don't want to force iroot 2706 * back onto the SIDEQ, and we also don't want the flush code 2707 * to update pfs_iroot_blocksets until the final flush later. 2708 * 2709 * XXX at the moment this will likely result in a double-flush 2710 * of the iroot chain. 2711 */ 2712 hammer2_inode_chain_sync(ip); 2713 if (ip == pmp->iroot) { 2714 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 2715 } else { 2716 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2717 HAMMER2_XOP_FSSYNC); 2718 } 2719 if (vp) { 2720 lwkt_gettoken(&vp->v_token); 2721 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 2722 HAMMER2_INODE_RESIZED | 2723 HAMMER2_INODE_DIRTYDATA)) == 0 && 2724 RB_EMPTY(&vp->v_rbdirty_tree) && 2725 !bio_track_active(&vp->v_track_write)) { 2726 vclrisdirty(vp); 2727 } else { 2728 hammer2_inode_delayed_sideq(ip); 2729 } 2730 lwkt_reltoken(&vp->v_token); 2731 vput(vp); 2732 vp = NULL; /* safety */ 2733 } 2734 atomic_clear_int(&ip->flags, HAMMER2_INODE_SYNCQ_PASS2); 2735 hammer2_inode_unlock(ip); /* unlock+drop */ 2736 /* ip pointer invalid */ 2737 2738 /* 2739 * If the inode got dirted after we dropped our locks, 2740 * it will have already been moved back to the SIDEQ. 2741 */ 2742 hammer2_spin_ex(&pmp->list_spin); 2743 } 2744 hammer2_spin_unex(&pmp->list_spin); 2745 hammer2_pfs_memory_wakeup(pmp, 0); 2746 2747 if (dorestart || (pmp->trans.flags & HAMMER2_TRANS_RESCAN)) { 2748 #ifdef HAMMER2_DEBUG_SYNC 2749 kprintf("FILESYSTEM SYNC STAGE 1 RESTART\n"); 2750 /*tsleep(&dorestart, 0, "h2STG1-R", hz*20);*/ 2751 #endif 2752 dorestart = 1; 2753 goto restart; 2754 } 2755 #ifdef HAMMER2_DEBUG_SYNC 2756 kprintf("FILESYSTEM SYNC STAGE 2 BEGIN\n"); 2757 /*tsleep(&dorestart, 0, "h2STG2", hz*20);*/ 2758 #endif 2759 2760 /* 2761 * We have to flush the PFS root last, even if it does not appear to 2762 * be dirty, because all the inodes in the PFS are indexed under it. 2763 * The normal flushing of iroot above would only occur if directory 2764 * entries under the root were changed. 2765 * 2766 * Specifying VOLHDR will cause an additionl flush of hmp->spmp 2767 * for the media making up the cluster. 2768 */ 2769 if ((ip = pmp->iroot) != NULL) { 2770 hammer2_inode_ref(ip); 2771 hammer2_mtx_ex(&ip->lock); 2772 hammer2_inode_chain_sync(ip); 2773 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2774 HAMMER2_XOP_FSSYNC | 2775 HAMMER2_XOP_VOLHDR); 2776 hammer2_inode_unlock(ip); /* unlock+drop */ 2777 } 2778 #ifdef HAMMER2_DEBUG_SYNC 2779 kprintf("FILESYSTEM SYNC STAGE 2 DONE\n"); 2780 #endif 2781 2782 /* 2783 * device bioq sync 2784 */ 2785 hammer2_bioq_sync(pmp); 2786 2787 #if 0 2788 info.pass = 1; 2789 info.waitfor = MNT_WAIT; 2790 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2791 2792 info.pass = 2; 2793 info.waitfor = MNT_WAIT; 2794 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2795 #endif 2796 #if 0 2797 /* 2798 * Generally speaking we now want to flush the media topology from 2799 * the iroot through to the inodes. The flush stops at any inode 2800 * boundary, which allows the frontend to continue running concurrent 2801 * modifying operations on inodes (including kernel flushes of 2802 * buffers) without interfering with the main sync. 2803 * 2804 * Use the XOP interface to concurrently flush all nodes to 2805 * synchronize the PFSROOT subtopology to the media. A standard 2806 * end-of-scan ENOENT error indicates cluster sufficiency. 2807 * 2808 * Note that this flush will not be visible on crash recovery until 2809 * we flush the super-root topology in the next loop. 2810 * 2811 * XXX For now wait for all flushes to complete. 2812 */ 2813 if (mp && (ip = pmp->iroot) != NULL) { 2814 /* 2815 * If unmounting try to flush everything including any 2816 * sub-trees under inodes, just in case there is dangling 2817 * modified data, as a safety. Otherwise just flush up to 2818 * the inodes in this stage. 2819 */ 2820 kprintf("MP & IROOT\n"); 2821 #ifdef HAMMER2_DEBUG_SYNC 2822 kprintf("FILESYSTEM SYNC STAGE 3 IROOT BEGIN\n"); 2823 #endif 2824 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 2825 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING | 2826 HAMMER2_XOP_VOLHDR | 2827 HAMMER2_XOP_FSSYNC | 2828 HAMMER2_XOP_INODE_STOP); 2829 } else { 2830 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING | 2831 HAMMER2_XOP_INODE_STOP | 2832 HAMMER2_XOP_VOLHDR | 2833 HAMMER2_XOP_FSSYNC | 2834 HAMMER2_XOP_INODE_STOP); 2835 } 2836 hammer2_xop_start(&xop->head, &hammer2_inode_flush_desc); 2837 error = hammer2_xop_collect(&xop->head, 2838 HAMMER2_XOP_COLLECT_WAITALL); 2839 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2840 #ifdef HAMMER2_DEBUG_SYNC 2841 kprintf("FILESYSTEM SYNC STAGE 3 IROOT END\n"); 2842 #endif 2843 if (error == HAMMER2_ERROR_ENOENT) 2844 error = 0; 2845 else 2846 error = hammer2_error_to_errno(error); 2847 } else { 2848 error = 0; 2849 } 2850 #endif 2851 error = 0; /* XXX */ 2852 hammer2_trans_done(pmp, HAMMER2_TRANS_ISFLUSH); 2853 2854 return (error); 2855 } 2856 2857 static 2858 int 2859 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2860 { 2861 hammer2_inode_t *ip; 2862 2863 KKASSERT(MAXFIDSZ >= 16); 2864 ip = VTOI(vp); 2865 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2866 fhp->fid_ext = 0; 2867 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2868 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2869 2870 return 0; 2871 } 2872 2873 static 2874 int 2875 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2876 struct fid *fhp, struct vnode **vpp) 2877 { 2878 hammer2_pfs_t *pmp; 2879 hammer2_tid_t inum; 2880 int error; 2881 2882 pmp = MPTOPMP(mp); 2883 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2884 if (vpp) { 2885 if (inum == 1) 2886 error = hammer2_vfs_root(mp, vpp); 2887 else 2888 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2889 } else { 2890 error = 0; 2891 } 2892 if (error) 2893 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2894 return error; 2895 } 2896 2897 static 2898 int 2899 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2900 int *exflagsp, struct ucred **credanonp) 2901 { 2902 hammer2_pfs_t *pmp; 2903 struct netcred *np; 2904 int error; 2905 2906 pmp = MPTOPMP(mp); 2907 np = vfs_export_lookup(mp, &pmp->export, nam); 2908 if (np) { 2909 *exflagsp = np->netc_exflags; 2910 *credanonp = &np->netc_anon; 2911 error = 0; 2912 } else { 2913 error = EACCES; 2914 } 2915 return error; 2916 } 2917 2918 /* 2919 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2920 * header into the HMP 2921 */ 2922 static 2923 int 2924 hammer2_install_volume_header(hammer2_dev_t *hmp) 2925 { 2926 hammer2_volume_data_t *vd; 2927 struct buf *bp; 2928 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2929 int error_reported; 2930 int error; 2931 int valid; 2932 int i; 2933 2934 error_reported = 0; 2935 error = 0; 2936 valid = 0; 2937 bp = NULL; 2938 2939 /* 2940 * There are up to 4 copies of the volume header (syncs iterate 2941 * between them so there is no single master). We don't trust the 2942 * volu_size field so we don't know precisely how large the filesystem 2943 * is, so depend on the OS to return an error if we go beyond the 2944 * block device's EOF. 2945 */ 2946 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2947 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2948 HAMMER2_VOLUME_BYTES, &bp); 2949 if (error) { 2950 brelse(bp); 2951 bp = NULL; 2952 continue; 2953 } 2954 2955 vd = (struct hammer2_volume_data *) bp->b_data; 2956 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2957 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2958 kprintf("hammer2: volume header #%d: bad magic\n", i); 2959 brelse(bp); 2960 bp = NULL; 2961 continue; 2962 } 2963 2964 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2965 /* XXX: Reversed-endianness filesystem */ 2966 kprintf("hammer2: volume header #%d: reverse-endian " 2967 "filesystem detected\n", i); 2968 brelse(bp); 2969 bp = NULL; 2970 continue; 2971 } 2972 2973 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2974 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2975 HAMMER2_VOLUME_ICRC0_SIZE); 2976 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2977 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2978 HAMMER2_VOLUME_ICRC1_SIZE); 2979 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2980 kprintf("hammer2: volume header #%d: volume header crc " 2981 "mismatch %08x/%08x\n", 2982 i, crc0, crc); 2983 error_reported = 1; 2984 brelse(bp); 2985 bp = NULL; 2986 continue; 2987 } 2988 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2989 valid = 1; 2990 hmp->voldata = *vd; 2991 hmp->volhdrno = i; 2992 } 2993 brelse(bp); 2994 bp = NULL; 2995 } 2996 if (valid) { 2997 hmp->volsync = hmp->voldata; 2998 hmp->free_reserved = hmp->voldata.allocator_size / 20; 2999 error = 0; 3000 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 3001 kprintf("hammer2: using volume header #%d\n", 3002 hmp->volhdrno); 3003 } 3004 } else { 3005 error = EINVAL; 3006 kprintf("hammer2: no valid volume headers found!\n"); 3007 } 3008 return (error); 3009 } 3010 3011 /* 3012 * This handles hysteresis on regular file flushes. Because the BIOs are 3013 * routed to a thread it is possible for an excessive number to build up 3014 * and cause long front-end stalls long before the runningbuffspace limit 3015 * is hit, so we implement hammer2_flush_pipe to control the 3016 * hysteresis. 3017 * 3018 * This is a particular problem when compression is used. 3019 */ 3020 void 3021 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 3022 { 3023 atomic_add_int(&pmp->count_lwinprog, 1); 3024 } 3025 3026 void 3027 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 3028 { 3029 int lwinprog; 3030 3031 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 3032 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 3033 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 3034 atomic_clear_int(&pmp->count_lwinprog, 3035 HAMMER2_LWINPROG_WAITING); 3036 wakeup(&pmp->count_lwinprog); 3037 } 3038 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 3039 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 3040 atomic_clear_int(&pmp->count_lwinprog, 3041 HAMMER2_LWINPROG_WAITING0); 3042 wakeup(&pmp->count_lwinprog); 3043 } 3044 } 3045 3046 void 3047 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 3048 { 3049 int lwinprog; 3050 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 3051 HAMMER2_LWINPROG_WAITING0; 3052 3053 for (;;) { 3054 lwinprog = pmp->count_lwinprog; 3055 cpu_ccfence(); 3056 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 3057 break; 3058 tsleep_interlock(&pmp->count_lwinprog, 0); 3059 atomic_set_int(&pmp->count_lwinprog, lwflag); 3060 lwinprog = pmp->count_lwinprog; 3061 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 3062 break; 3063 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 3064 } 3065 } 3066 3067 /* 3068 * It is possible for an excessive number of dirty chains or dirty inodes 3069 * to build up. When this occurs we start an asynchronous filesystem sync. 3070 * If the level continues to build up, we stall, waiting for it to drop, 3071 * with some hysteresis. 3072 * 3073 * This relies on the kernel calling hammer2_vfs_modifying() prior to 3074 * obtaining any vnode locks before making a modifying VOP call. 3075 */ 3076 static int 3077 hammer2_vfs_modifying(struct mount *mp) 3078 { 3079 if (mp->mnt_flag & MNT_RDONLY) 3080 return EROFS; 3081 hammer2_pfs_memory_wait(MPTOPMP(mp)); 3082 3083 return 0; 3084 } 3085 3086 /* 3087 * Initiate an asynchronous filesystem sync and, with hysteresis, 3088 * stall if the internal data structure count becomes too bloated. 3089 */ 3090 void 3091 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 3092 { 3093 uint32_t waiting; 3094 int pcatch; 3095 int error; 3096 3097 if (pmp == NULL || pmp->mp == NULL) 3098 return; 3099 3100 for (;;) { 3101 waiting = pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK; 3102 cpu_ccfence(); 3103 3104 /* 3105 * Start the syncer running at 1/2 the limit 3106 */ 3107 if (waiting > hammer2_limit_dirty_chains / 2 || 3108 pmp->sideq_count > hammer2_limit_dirty_inodes / 2) { 3109 trigger_syncer(pmp->mp); 3110 } 3111 3112 /* 3113 * Stall at the limit waiting for the counts to drop. 3114 * This code will typically be woken up once the count 3115 * drops below 3/4 the limit, or in one second. 3116 */ 3117 if (waiting < hammer2_limit_dirty_chains && 3118 pmp->sideq_count < hammer2_limit_dirty_inodes) { 3119 break; 3120 } 3121 3122 pcatch = curthread->td_proc ? PCATCH : 0; 3123 3124 tsleep_interlock(&pmp->inmem_dirty_chains, pcatch); 3125 atomic_set_int(&pmp->inmem_dirty_chains, 3126 HAMMER2_DIRTYCHAIN_WAITING); 3127 if (waiting < hammer2_limit_dirty_chains && 3128 pmp->sideq_count < hammer2_limit_dirty_inodes) { 3129 break; 3130 } 3131 trigger_syncer(pmp->mp); 3132 error = tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED | pcatch, 3133 "h2memw", hz); 3134 if (error == ERESTART) 3135 break; 3136 } 3137 } 3138 3139 /* 3140 * Wake up any stalled frontend ops waiting, with hysteresis, using 3141 * 2/3 of the limit. 3142 */ 3143 void 3144 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp, int count) 3145 { 3146 uint32_t waiting; 3147 3148 if (pmp) { 3149 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, count); 3150 /* don't need --waiting to test flag */ 3151 3152 if ((waiting & HAMMER2_DIRTYCHAIN_WAITING) && 3153 (pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK) <= 3154 hammer2_limit_dirty_chains * 2 / 3 && 3155 pmp->sideq_count <= hammer2_limit_dirty_inodes * 2 / 3) { 3156 atomic_clear_int(&pmp->inmem_dirty_chains, 3157 HAMMER2_DIRTYCHAIN_WAITING); 3158 wakeup(&pmp->inmem_dirty_chains); 3159 } 3160 } 3161 } 3162 3163 void 3164 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 3165 { 3166 if (pmp) { 3167 atomic_add_int(&pmp->inmem_dirty_chains, 1); 3168 } 3169 } 3170 3171 /* 3172 * Returns 0 if the filesystem has tons of free space 3173 * Returns 1 if the filesystem has less than 10% remaining 3174 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining. 3175 */ 3176 int 3177 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred) 3178 { 3179 hammer2_pfs_t *pmp; 3180 hammer2_dev_t *hmp; 3181 hammer2_off_t free_reserved; 3182 hammer2_off_t free_nominal; 3183 int i; 3184 3185 pmp = ip->pmp; 3186 3187 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) { 3188 free_reserved = HAMMER2_SEGSIZE; 3189 free_nominal = 0x7FFFFFFFFFFFFFFFLLU; 3190 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 3191 hmp = pmp->pfs_hmps[i]; 3192 if (hmp == NULL) 3193 continue; 3194 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER && 3195 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER) 3196 continue; 3197 3198 if (free_nominal > hmp->voldata.allocator_free) 3199 free_nominal = hmp->voldata.allocator_free; 3200 if (free_reserved < hmp->free_reserved) 3201 free_reserved = hmp->free_reserved; 3202 } 3203 3204 /* 3205 * SMP races ok 3206 */ 3207 pmp->free_reserved = free_reserved; 3208 pmp->free_nominal = free_nominal; 3209 pmp->free_ticks = ticks; 3210 } else { 3211 free_reserved = pmp->free_reserved; 3212 free_nominal = pmp->free_nominal; 3213 } 3214 if (cred && cred->cr_uid != 0) { 3215 if ((int64_t)(free_nominal - bytes) < 3216 (int64_t)free_reserved) { 3217 return 2; 3218 } 3219 } else { 3220 if ((int64_t)(free_nominal - bytes) < 3221 (int64_t)free_reserved / 2) { 3222 return 2; 3223 } 3224 } 3225 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2) 3226 return 1; 3227 return 0; 3228 } 3229 3230 /* 3231 * Debugging 3232 */ 3233 void 3234 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int bi, int *countp, 3235 char pfx, u_int flags) 3236 { 3237 hammer2_chain_t *scan; 3238 hammer2_chain_t *parent; 3239 3240 --*countp; 3241 if (*countp == 0) { 3242 kprintf("%*.*s...\n", tab, tab, ""); 3243 return; 3244 } 3245 if (*countp < 0) 3246 return; 3247 kprintf("%*.*s%c-chain %p %s.%-3d %016jx %016jx/%-2d mir=%016jx\n", 3248 tab, tab, "", pfx, chain, 3249 hammer2_bref_type_str(chain->bref.type), bi, 3250 chain->bref.data_off, chain->bref.key, chain->bref.keybits, 3251 chain->bref.mirror_tid); 3252 3253 kprintf("%*.*s [%08x] (%s) refs=%d", 3254 tab, tab, "", 3255 chain->flags, 3256 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 3257 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 3258 chain->refs); 3259 3260 parent = chain->parent; 3261 if (parent) 3262 kprintf("\n%*.*s p=%p [pflags %08x prefs %d]", 3263 tab, tab, "", 3264 parent, parent->flags, parent->refs); 3265 if (RB_EMPTY(&chain->core.rbtree)) { 3266 kprintf("\n"); 3267 } else { 3268 int bi = 0; 3269 kprintf(" {\n"); 3270 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) { 3271 if ((scan->flags & flags) || flags == (u_int)-1) { 3272 hammer2_dump_chain(scan, tab + 4, bi, countp, 3273 'a', flags); 3274 } 3275 bi++; 3276 } 3277 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 3278 kprintf("%*.*s}(%s)\n", tab, tab, "", 3279 chain->data->ipdata.filename); 3280 else 3281 kprintf("%*.*s}\n", tab, tab, ""); 3282 } 3283 } 3284