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/namei.h> 51 #include <sys/mountctl.h> 52 #include <sys/dirent.h> 53 #include <sys/uio.h> 54 55 #include <sys/mutex.h> 56 #include <sys/mutex2.h> 57 58 #include "hammer2.h" 59 #include "hammer2_disk.h" 60 #include "hammer2_mount.h" 61 #include "hammer2_lz4.h" 62 63 #include "zlib/hammer2_zlib.h" 64 65 #define REPORT_REFS_ERRORS 1 /* XXX remove me */ 66 67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache"); 68 69 struct hammer2_sync_info { 70 int error; 71 int waitfor; 72 int pass; 73 }; 74 75 TAILQ_HEAD(hammer2_mntlist, hammer2_dev); 76 static struct hammer2_mntlist hammer2_mntlist; 77 78 struct hammer2_pfslist hammer2_pfslist; 79 struct hammer2_pfslist hammer2_spmplist; 80 struct lock hammer2_mntlk; 81 82 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT; 83 int hammer2_debug; 84 long hammer2_debug_inode; 85 int hammer2_cluster_meta_read = 1; /* physical read-ahead */ 86 int hammer2_cluster_data_read = 4; /* physical read-ahead */ 87 int hammer2_cluster_write = 0; /* physical write clustering */ 88 int hammer2_dedup_enable = 1; 89 int hammer2_always_compress = 0; /* always try to compress */ 90 int hammer2_inval_enable = 0; 91 int hammer2_flush_pipe = 100; 92 int hammer2_dio_count; 93 int hammer2_dio_limit = 256; 94 int hammer2_bulkfree_tps = 5000; 95 int hammer2_worker_rmask = 3; 96 long hammer2_chain_allocs; 97 long hammer2_chain_frees; 98 long hammer2_limit_dirty_chains; 99 long hammer2_limit_dirty_inodes; 100 long hammer2_count_modified_chains; 101 long hammer2_iod_invals; 102 long hammer2_iod_file_read; 103 long hammer2_iod_meta_read; 104 long hammer2_iod_indr_read; 105 long hammer2_iod_fmap_read; 106 long hammer2_iod_volu_read; 107 long hammer2_iod_file_write; 108 long hammer2_iod_file_wembed; 109 long hammer2_iod_file_wzero; 110 long hammer2_iod_file_wdedup; 111 long hammer2_iod_meta_write; 112 long hammer2_iod_indr_write; 113 long hammer2_iod_fmap_write; 114 long hammer2_iod_volu_write; 115 long hammer2_iod_inode_creates; 116 long hammer2_iod_inode_deletes; 117 118 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 119 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 120 "Buffer used for compression."); 121 122 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 123 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 124 "Buffer used for decompression."); 125 126 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 127 128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD, 129 &hammer2_supported_version, 0, ""); 130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 131 &hammer2_debug, 0, ""); 132 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, debug_inode, CTLFLAG_RW, 133 &hammer2_debug_inode, 0, ""); 134 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW, 135 &hammer2_cluster_meta_read, 0, ""); 136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW, 137 &hammer2_cluster_data_read, 0, ""); 138 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW, 139 &hammer2_cluster_write, 0, ""); 140 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 141 &hammer2_dedup_enable, 0, ""); 142 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW, 143 &hammer2_always_compress, 0, ""); 144 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW, 145 &hammer2_inval_enable, 0, ""); 146 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 147 &hammer2_flush_pipe, 0, ""); 148 SYSCTL_INT(_vfs_hammer2, OID_AUTO, worker_rmask, CTLFLAG_RW, 149 &hammer2_worker_rmask, 0, ""); 150 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW, 151 &hammer2_bulkfree_tps, 0, ""); 152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW, 153 &hammer2_chain_allocs, 0, ""); 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW, 155 &hammer2_chain_frees, 0, ""); 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 157 &hammer2_limit_dirty_chains, 0, ""); 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW, 159 &hammer2_limit_dirty_inodes, 0, ""); 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW, 161 &hammer2_count_modified_chains, 0, ""); 162 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 163 &hammer2_dio_count, 0, ""); 164 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW, 165 &hammer2_dio_limit, 0, ""); 166 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW, 168 &hammer2_iod_invals, 0, ""); 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW, 170 &hammer2_iod_file_read, 0, ""); 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW, 172 &hammer2_iod_meta_read, 0, ""); 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW, 174 &hammer2_iod_indr_read, 0, ""); 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW, 176 &hammer2_iod_fmap_read, 0, ""); 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW, 178 &hammer2_iod_volu_read, 0, ""); 179 180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW, 181 &hammer2_iod_file_write, 0, ""); 182 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW, 183 &hammer2_iod_file_wembed, 0, ""); 184 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW, 185 &hammer2_iod_file_wzero, 0, ""); 186 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW, 187 &hammer2_iod_file_wdedup, 0, ""); 188 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW, 189 &hammer2_iod_meta_write, 0, ""); 190 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW, 191 &hammer2_iod_indr_write, 0, ""); 192 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW, 193 &hammer2_iod_fmap_write, 0, ""); 194 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW, 195 &hammer2_iod_volu_write, 0, ""); 196 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_creates, CTLFLAG_RW, 197 &hammer2_iod_inode_creates, 0, ""); 198 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_deletes, CTLFLAG_RW, 199 &hammer2_iod_inode_deletes, 0, ""); 200 201 long hammer2_process_icrc32; 202 long hammer2_process_xxhash64; 203 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW, 204 &hammer2_process_icrc32, 0, ""); 205 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW, 206 &hammer2_process_xxhash64, 0, ""); 207 208 static int hammer2_vfs_init(struct vfsconf *conf); 209 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 210 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 211 struct ucred *cred); 212 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 213 struct vnode *, struct ucred *); 214 static int hammer2_recovery(hammer2_dev_t *hmp); 215 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 216 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 217 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 218 struct ucred *cred); 219 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 220 struct ucred *cred); 221 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 222 struct fid *fhp, struct vnode **vpp); 223 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 224 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 225 int *exflagsp, struct ucred **credanonp); 226 static void hammer2_vfs_modifying(struct mount *mp); 227 228 static int hammer2_install_volume_header(hammer2_dev_t *hmp); 229 #if 0 230 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 231 #endif 232 233 static void hammer2_update_pmps(hammer2_dev_t *hmp); 234 235 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 236 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 237 hammer2_dev_t *hmp); 238 static int hammer2_fixup_pfses(hammer2_dev_t *hmp); 239 240 /* 241 * HAMMER2 vfs operations. 242 */ 243 static struct vfsops hammer2_vfsops = { 244 .vfs_init = hammer2_vfs_init, 245 .vfs_uninit = hammer2_vfs_uninit, 246 .vfs_sync = hammer2_vfs_sync, 247 .vfs_mount = hammer2_vfs_mount, 248 .vfs_unmount = hammer2_vfs_unmount, 249 .vfs_root = hammer2_vfs_root, 250 .vfs_statfs = hammer2_vfs_statfs, 251 .vfs_statvfs = hammer2_vfs_statvfs, 252 .vfs_vget = hammer2_vfs_vget, 253 .vfs_vptofh = hammer2_vfs_vptofh, 254 .vfs_fhtovp = hammer2_vfs_fhtovp, 255 .vfs_checkexp = hammer2_vfs_checkexp, 256 .vfs_modifying = hammer2_vfs_modifying 257 }; 258 259 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 260 261 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE); 262 MODULE_VERSION(hammer2, 1); 263 264 static 265 int 266 hammer2_vfs_init(struct vfsconf *conf) 267 { 268 static struct objcache_malloc_args margs_read; 269 static struct objcache_malloc_args margs_write; 270 static struct objcache_malloc_args margs_vop; 271 272 int error; 273 274 error = 0; 275 kmalloc_raise_limit(M_HAMMER2, 0); /* unlimited */ 276 277 /* 278 * A large DIO cache is needed to retain dedup enablement masks. 279 * The bulkfree code clears related masks as part of the disk block 280 * recycling algorithm, preventing it from being used for a later 281 * dedup. 282 * 283 * NOTE: A large buffer cache can actually interfere with dedup 284 * operation because we dedup based on media physical buffers 285 * and not logical buffers. Try to make the DIO case large 286 * enough to avoid this problem, but also cap it. 287 */ 288 hammer2_dio_limit = nbuf * 2; 289 if (hammer2_dio_limit > 100000) 290 hammer2_dio_limit = 100000; 291 292 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 293 error = EINVAL; 294 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 295 error = EINVAL; 296 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 297 error = EINVAL; 298 299 if (error) 300 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 301 302 margs_read.objsize = 65536; 303 margs_read.mtype = M_HAMMER2_DEBUFFER; 304 305 margs_write.objsize = 32768; 306 margs_write.mtype = M_HAMMER2_CBUFFER; 307 308 margs_vop.objsize = sizeof(hammer2_xop_t); 309 margs_vop.mtype = M_HAMMER2; 310 311 /* 312 * Note thaht for the XOPS cache we want backing store allocations 313 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 314 * confusion), so use the backing store function that does it. This 315 * means that initial XOPS objects are zerod but REUSED objects are 316 * not. So we are responsible for cleaning the object up sufficiently 317 * for our needs before objcache_put()ing it back (typically just the 318 * FIFO indices). 319 */ 320 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 321 0, 1, NULL, NULL, NULL, 322 objcache_malloc_alloc, 323 objcache_malloc_free, 324 &margs_read); 325 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 326 0, 1, NULL, NULL, NULL, 327 objcache_malloc_alloc, 328 objcache_malloc_free, 329 &margs_write); 330 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 331 0, 1, NULL, NULL, NULL, 332 objcache_malloc_alloc_zero, 333 objcache_malloc_free, 334 &margs_vop); 335 336 337 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 338 TAILQ_INIT(&hammer2_mntlist); 339 TAILQ_INIT(&hammer2_pfslist); 340 TAILQ_INIT(&hammer2_spmplist); 341 342 hammer2_limit_dirty_chains = maxvnodes / 10; 343 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 344 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 345 if (hammer2_limit_dirty_chains < 1000) 346 hammer2_limit_dirty_chains = 1000; 347 348 hammer2_limit_dirty_inodes = maxvnodes / 25; 349 if (hammer2_limit_dirty_inodes < 100) 350 hammer2_limit_dirty_inodes = 100; 351 if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES) 352 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES; 353 354 return (error); 355 } 356 357 static 358 int 359 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 360 { 361 objcache_destroy(cache_buffer_read); 362 objcache_destroy(cache_buffer_write); 363 objcache_destroy(cache_xops); 364 return 0; 365 } 366 367 /* 368 * Core PFS allocator. Used to allocate or reference the pmp structure 369 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 370 * The pmp can be passed in or loaded by this function using the chain and 371 * inode data. 372 * 373 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 374 * transactions. Note that synchronization does not use this field. 375 * (typically frontend operations and synchronization cannot run on the 376 * same PFS node at the same time). 377 * 378 * XXX check locking 379 */ 380 hammer2_pfs_t * 381 hammer2_pfsalloc(hammer2_chain_t *chain, 382 const hammer2_inode_data_t *ripdata, 383 hammer2_tid_t modify_tid, hammer2_dev_t *force_local) 384 { 385 hammer2_pfs_t *pmp; 386 hammer2_inode_t *iroot; 387 int count; 388 int i; 389 int j; 390 391 pmp = NULL; 392 393 /* 394 * Locate or create the PFS based on the cluster id. If ripdata 395 * is NULL this is a spmp which is unique and is always allocated. 396 * 397 * If the device is mounted in local mode all PFSs are considered 398 * independent and not part of any cluster (for debugging only). 399 */ 400 if (ripdata) { 401 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 402 if (force_local != pmp->force_local) 403 continue; 404 if (force_local == NULL && 405 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 406 sizeof(pmp->pfs_clid)) == 0) { 407 break; 408 } else if (force_local && pmp->pfs_names[0] && 409 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) { 410 break; 411 } 412 } 413 } 414 415 if (pmp == NULL) { 416 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 417 pmp->force_local = force_local; 418 hammer2_trans_manage_init(pmp); 419 kmalloc_create(&pmp->minode, "HAMMER2-inodes"); 420 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg"); 421 lockinit(&pmp->lock, "pfslk", 0, 0); 422 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0); 423 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum"); 424 spin_init(&pmp->xop_spin, "h2xop"); 425 spin_init(&pmp->lru_spin, "h2lru"); 426 RB_INIT(&pmp->inum_tree); 427 TAILQ_INIT(&pmp->syncq); 428 TAILQ_INIT(&pmp->depq); 429 TAILQ_INIT(&pmp->lru_list); 430 spin_init(&pmp->list_spin, "h2pfsalloc_list"); 431 432 /* 433 * Distribute backend operations to threads 434 */ 435 for (i = 0; i < HAMMER2_XOPGROUPS; ++i) 436 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]); 437 438 /* 439 * Save the last media transaction id for the flusher. Set 440 * initial 441 */ 442 if (ripdata) { 443 pmp->pfs_clid = ripdata->meta.pfs_clid; 444 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 445 } else { 446 pmp->flags |= HAMMER2_PMPF_SPMP; 447 TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry); 448 } 449 450 /* 451 * The synchronization thread may start too early, make 452 * sure it stays frozen until we are ready to let it go. 453 * XXX 454 */ 455 /* 456 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 457 HAMMER2_THREAD_REMASTER; 458 */ 459 } 460 461 /* 462 * Create the PFS's root inode and any missing XOP helper threads. 463 */ 464 if ((iroot = pmp->iroot) == NULL) { 465 iroot = hammer2_inode_get(pmp, NULL, 1, -1); 466 if (ripdata) 467 iroot->meta = ripdata->meta; 468 pmp->iroot = iroot; 469 hammer2_inode_ref(iroot); 470 hammer2_inode_unlock(iroot); 471 } 472 473 /* 474 * Stop here if no chain is passed in. 475 */ 476 if (chain == NULL) 477 goto done; 478 479 /* 480 * When a chain is passed in we must add it to the PFS's root 481 * inode, update pmp->pfs_types[], and update the syncronization 482 * threads. 483 * 484 * When forcing local mode, mark the PFS as a MASTER regardless. 485 * 486 * At the moment empty spots can develop due to removals or failures. 487 * Ultimately we want to re-fill these spots but doing so might 488 * confused running code. XXX 489 */ 490 hammer2_inode_ref(iroot); 491 hammer2_mtx_ex(&iroot->lock); 492 j = iroot->cluster.nchains; 493 494 if (j == HAMMER2_MAXCLUSTER) { 495 kprintf("hammer2_mount: cluster full!\n"); 496 /* XXX fatal error? */ 497 } else { 498 KKASSERT(chain->pmp == NULL); 499 chain->pmp = pmp; 500 hammer2_chain_ref(chain); 501 iroot->cluster.array[j].chain = chain; 502 if (force_local) 503 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 504 else 505 pmp->pfs_types[j] = ripdata->meta.pfs_type; 506 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2); 507 pmp->pfs_hmps[j] = chain->hmp; 508 hammer2_spin_ex(&pmp->inum_spin); 509 pmp->pfs_iroot_blocksets[j] = chain->data->ipdata.u.blockset; 510 hammer2_spin_unex(&pmp->inum_spin); 511 512 /* 513 * If the PFS is already mounted we must account 514 * for the mount_count here. 515 */ 516 if (pmp->mp) 517 ++chain->hmp->mount_count; 518 519 /* 520 * May have to fixup dirty chain tracking. Previous 521 * pmp was NULL so nothing to undo. 522 */ 523 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 524 hammer2_pfs_memory_inc(pmp); 525 ++j; 526 } 527 iroot->cluster.nchains = j; 528 529 /* 530 * Update nmasters from any PFS inode which is part of the cluster. 531 * It is possible that this will result in a value which is too 532 * high. MASTER PFSs are authoritative for pfs_nmasters and will 533 * override this value later on. 534 * 535 * (This informs us of masters that might not currently be 536 * discoverable by this mount). 537 */ 538 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 539 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 540 } 541 542 /* 543 * Count visible masters. Masters are usually added with 544 * ripdata->meta.pfs_nmasters set to 1. This detects when there 545 * are more (XXX and must update the master inodes). 546 */ 547 count = 0; 548 for (i = 0; i < iroot->cluster.nchains; ++i) { 549 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 550 ++count; 551 } 552 if (pmp->pfs_nmasters < count) 553 pmp->pfs_nmasters = count; 554 555 /* 556 * Create missing synchronization and support threads. 557 * 558 * Single-node masters (including snapshots) have nothing to 559 * synchronize and do not require this thread. 560 * 561 * Multi-node masters or any number of soft masters, slaves, copy, 562 * or other PFS types need the thread. 563 * 564 * Each thread is responsible for its particular cluster index. 565 * We use independent threads so stalls or mismatches related to 566 * any given target do not affect other targets. 567 */ 568 for (i = 0; i < iroot->cluster.nchains; ++i) { 569 /* 570 * Single-node masters (including snapshots) have nothing 571 * to synchronize and will make direct xops support calls, 572 * thus they do not require this thread. 573 * 574 * Note that there can be thousands of snapshots. We do not 575 * want to create thousands of threads. 576 */ 577 if (pmp->pfs_nmasters <= 1 && 578 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 579 continue; 580 } 581 582 /* 583 * Sync support thread 584 */ 585 if (pmp->sync_thrs[i].td == NULL) { 586 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL, 587 "h2nod", i, -1, 588 hammer2_primary_sync_thread); 589 } 590 } 591 592 /* 593 * Create missing Xop threads 594 * 595 * NOTE: We create helper threads for all mounted PFSs or any 596 * PFSs with 2+ nodes (so the sync thread can update them, 597 * even if not mounted). 598 */ 599 if (pmp->mp || iroot->cluster.nchains >= 2) 600 hammer2_xop_helper_create(pmp); 601 602 hammer2_mtx_unlock(&iroot->lock); 603 hammer2_inode_drop(iroot); 604 done: 605 return pmp; 606 } 607 608 /* 609 * Deallocate an element of a probed PFS. If destroying and this is a 610 * MASTER, adjust nmasters. 611 * 612 * This function does not physically destroy the PFS element in its device 613 * under the super-root (see hammer2_ioctl_pfs_delete()). 614 */ 615 void 616 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 617 { 618 hammer2_inode_t *iroot; 619 hammer2_chain_t *chain; 620 int j; 621 622 /* 623 * Cleanup our reference on iroot. iroot is (should) not be needed 624 * by the flush code. 625 */ 626 iroot = pmp->iroot; 627 if (iroot) { 628 /* 629 * Stop synchronizing 630 * 631 * XXX flush after acquiring the iroot lock. 632 * XXX clean out the cluster index from all inode structures. 633 */ 634 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 635 636 /* 637 * Remove the cluster index from the group. If destroying 638 * the PFS and this is a master, adjust pfs_nmasters. 639 */ 640 hammer2_mtx_ex(&iroot->lock); 641 chain = iroot->cluster.array[clindex].chain; 642 iroot->cluster.array[clindex].chain = NULL; 643 644 switch(pmp->pfs_types[clindex]) { 645 case HAMMER2_PFSTYPE_MASTER: 646 if (destroying && pmp->pfs_nmasters > 0) 647 --pmp->pfs_nmasters; 648 /* XXX adjust ripdata->meta.pfs_nmasters */ 649 break; 650 default: 651 break; 652 } 653 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 654 655 hammer2_mtx_unlock(&iroot->lock); 656 657 /* 658 * Release the chain. 659 */ 660 if (chain) { 661 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 662 hammer2_chain_drop(chain); 663 } 664 665 /* 666 * Terminate all XOP threads for the cluster index. 667 */ 668 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 669 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]); 670 } 671 } 672 673 /* 674 * Destroy a PFS, typically only occurs after the last mount on a device 675 * has gone away. 676 */ 677 static void 678 hammer2_pfsfree(hammer2_pfs_t *pmp) 679 { 680 hammer2_inode_t *iroot; 681 hammer2_chain_t *chain; 682 int chains_still_present = 0; 683 int i; 684 int j; 685 686 /* 687 * Cleanup our reference on iroot. iroot is (should) not be needed 688 * by the flush code. 689 */ 690 if (pmp->flags & HAMMER2_PMPF_SPMP) 691 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry); 692 else 693 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 694 695 /* 696 * Cleanup chains remaining on LRU list. 697 */ 698 hammer2_spin_ex(&pmp->lru_spin); 699 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) { 700 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU); 701 atomic_add_int(&pmp->lru_count, -1); 702 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU); 703 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node); 704 hammer2_chain_ref(chain); 705 hammer2_spin_unex(&pmp->lru_spin); 706 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 707 hammer2_chain_drop(chain); 708 hammer2_spin_ex(&pmp->lru_spin); 709 } 710 hammer2_spin_unex(&pmp->lru_spin); 711 712 /* 713 * Clean up iroot 714 */ 715 iroot = pmp->iroot; 716 if (iroot) { 717 for (i = 0; i < iroot->cluster.nchains; ++i) { 718 hammer2_thr_delete(&pmp->sync_thrs[i]); 719 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) 720 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]); 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 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 803 hammer2_thr_freeze_async( 804 &pmp->xop_groups[j].thrs[i]); 805 } 806 } 807 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 808 if (pmp->pfs_hmps[i] == NULL) 809 continue; 810 hammer2_thr_freeze(&pmp->sync_thrs[i]); 811 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 812 hammer2_thr_freeze( 813 &pmp->xop_groups[j].thrs[i]); 814 } 815 } 816 817 /* 818 * Lock the inode and clean out matching chains. 819 * Note that we cannot use hammer2_inode_lock_*() 820 * here because that would attempt to validate the 821 * cluster that we are in the middle of ripping 822 * apart. 823 * 824 * WARNING! We are working directly on the inodes 825 * embedded cluster. 826 */ 827 hammer2_mtx_ex(&iroot->lock); 828 829 /* 830 * Remove the chain from matching elements of the PFS. 831 */ 832 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 833 if (pmp->pfs_hmps[i] != hmp) 834 continue; 835 hammer2_thr_delete(&pmp->sync_thrs[i]); 836 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 837 hammer2_thr_delete( 838 &pmp->xop_groups[j].thrs[i]); 839 } 840 rchain = iroot->cluster.array[i].chain; 841 iroot->cluster.array[i].chain = NULL; 842 pmp->pfs_types[i] = 0; 843 if (pmp->pfs_names[i]) { 844 kfree(pmp->pfs_names[i], M_HAMMER2); 845 pmp->pfs_names[i] = NULL; 846 } 847 if (rchain) { 848 hammer2_chain_drop(rchain); 849 /* focus hint */ 850 if (iroot->cluster.focus == rchain) 851 iroot->cluster.focus = NULL; 852 } 853 pmp->pfs_hmps[i] = NULL; 854 } 855 hammer2_mtx_unlock(&iroot->lock); 856 857 /* 858 * Cleanup trailing chains. Gaps may remain. 859 */ 860 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 861 if (pmp->pfs_hmps[i]) 862 break; 863 } 864 iroot->cluster.nchains = i + 1; 865 866 /* 867 * If the PMP has no elements remaining we can destroy it. 868 * (this will transition management threads from frozen->exit). 869 */ 870 if (iroot->cluster.nchains == 0) { 871 /* 872 * If this was the hmp's spmp, we need to clean 873 * a little more stuff out. 874 */ 875 if (hmp->spmp == pmp) { 876 hmp->spmp = NULL; 877 hmp->vchain.pmp = NULL; 878 hmp->fchain.pmp = NULL; 879 } 880 881 /* 882 * Free the pmp and restart the loop 883 */ 884 KKASSERT(TAILQ_EMPTY(&pmp->syncq)); 885 KKASSERT(TAILQ_EMPTY(&pmp->depq)); 886 hammer2_pfsfree(pmp); 887 goto again; 888 } 889 890 /* 891 * If elements still remain we need to set the REMASTER 892 * flag and unfreeze it. 893 */ 894 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 895 if (pmp->pfs_hmps[i] == NULL) 896 continue; 897 hammer2_thr_remaster(&pmp->sync_thrs[i]); 898 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 899 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) { 900 hammer2_thr_remaster( 901 &pmp->xop_groups[j].thrs[i]); 902 hammer2_thr_unfreeze( 903 &pmp->xop_groups[j].thrs[i]); 904 } 905 } 906 } 907 } 908 909 /* 910 * Mount or remount HAMMER2 fileystem from physical media 911 * 912 * mountroot 913 * mp mount point structure 914 * path NULL 915 * data <unused> 916 * cred <unused> 917 * 918 * mount 919 * mp mount point structure 920 * path path to mount point 921 * data pointer to argument structure in user space 922 * volume volume path (device@LABEL form) 923 * hflags user mount flags 924 * cred user credentials 925 * 926 * RETURNS: 0 Success 927 * !0 error number 928 */ 929 static 930 int 931 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 932 struct ucred *cred) 933 { 934 struct hammer2_mount_info info; 935 hammer2_pfs_t *pmp; 936 hammer2_pfs_t *spmp; 937 hammer2_dev_t *hmp; 938 hammer2_dev_t *force_local; 939 hammer2_key_t key_next; 940 hammer2_key_t key_dummy; 941 hammer2_key_t lhc; 942 struct vnode *devvp; 943 struct nlookupdata nd; 944 hammer2_chain_t *parent; 945 hammer2_chain_t *chain; 946 const hammer2_inode_data_t *ripdata; 947 hammer2_blockref_t bref; 948 struct file *fp; 949 char devstr[MNAMELEN]; 950 size_t size; 951 size_t done; 952 char *dev; 953 char *label; 954 int ronly = 1; 955 int error; 956 int i; 957 958 hmp = NULL; 959 pmp = NULL; 960 dev = NULL; 961 label = NULL; 962 devvp = NULL; 963 964 if (path == NULL) { 965 /* 966 * Root mount 967 */ 968 bzero(&info, sizeof(info)); 969 info.cluster_fd = -1; 970 ksnprintf(devstr, sizeof(devstr), "%s", 971 mp->mnt_stat.f_mntfromname); 972 kprintf("hammer2_mount: root '%s'\n", devstr); 973 done = strlen(devstr) + 1; 974 } else { 975 /* 976 * Non-root mount or updating a mount 977 */ 978 error = copyin(data, &info, sizeof(info)); 979 if (error) 980 return (error); 981 982 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 983 if (error) 984 return (error); 985 kprintf("hammer2_mount: '%s'\n", devstr); 986 } 987 988 /* 989 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA 990 * if no label specified, based on the partition id. Error out if no 991 * label or device (with partition id) is specified. This is strictly 992 * a convenience to match the default label created by newfs_hammer2, 993 * our preference is that a label always be specified. 994 * 995 * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command 996 * that does not specify a device, as long as some H2 label 997 * has already been mounted from that device. This makes 998 * mounting snapshots a lot easier. 999 */ 1000 dev = devstr; 1001 label = strchr(devstr, '@'); 1002 if (label && ((label + 1) - dev) > done) { 1003 kprintf("hammer2: mount: bad label %s/%zd\n", 1004 devstr, done); 1005 return (EINVAL); 1006 } 1007 if (label == NULL || label[1] == 0) { 1008 char slice; 1009 1010 if (label == NULL) 1011 label = devstr + strlen(devstr); 1012 else 1013 *label = '\0'; /* clean up trailing @ */ 1014 1015 slice = label[-1]; 1016 switch(slice) { 1017 case 'a': 1018 label = "BOOT"; 1019 break; 1020 case 'd': 1021 label = "ROOT"; 1022 break; 1023 default: 1024 label = "DATA"; 1025 break; 1026 } 1027 } else { 1028 *label = '\0'; 1029 label++; 1030 } 1031 1032 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n", 1033 dev, label, (mp->mnt_flag & MNT_RDONLY)); 1034 1035 if (mp->mnt_flag & MNT_UPDATE) { 1036 /* 1037 * Update mount. Note that pmp->iroot->cluster is 1038 * an inode-embedded cluster and thus cannot be 1039 * directly locked. 1040 * 1041 * XXX HAMMER2 needs to implement NFS export via 1042 * mountctl. 1043 */ 1044 hammer2_cluster_t *cluster; 1045 1046 pmp = MPTOPMP(mp); 1047 pmp->hflags = info.hflags; 1048 cluster = &pmp->iroot->cluster; 1049 for (i = 0; i < cluster->nchains; ++i) { 1050 if (cluster->array[i].chain == NULL) 1051 continue; 1052 hmp = cluster->array[i].chain->hmp; 1053 devvp = hmp->devvp; 1054 error = hammer2_remount(hmp, mp, path, 1055 devvp, cred); 1056 if (error) 1057 break; 1058 } 1059 1060 return error; 1061 } 1062 1063 /* 1064 * HMP device mount 1065 * 1066 * If a path is specified and dev is not an empty string, lookup the 1067 * name and verify that it referes to a block device. 1068 * 1069 * If a path is specified and dev is an empty string we fall through 1070 * and locate the label in the hmp search. 1071 */ 1072 if (path && *dev != 0) { 1073 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW); 1074 if (error == 0) 1075 error = nlookup(&nd); 1076 if (error == 0) 1077 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 1078 nlookup_done(&nd); 1079 } else if (path == NULL) { 1080 /* root mount */ 1081 cdev_t cdev = kgetdiskbyname(dev); 1082 error = bdevvp(cdev, &devvp); 1083 if (error) 1084 kprintf("hammer2: cannot find '%s'\n", dev); 1085 } else { 1086 /* 1087 * We will locate the hmp using the label in the hmp loop. 1088 */ 1089 error = 0; 1090 } 1091 1092 /* 1093 * Make sure its a block device. Do not check to see if it is 1094 * already mounted until we determine that its a fresh H2 device. 1095 */ 1096 if (error == 0 && devvp) { 1097 vn_isdisk(devvp, &error); 1098 } 1099 1100 /* 1101 * Determine if the device has already been mounted. After this 1102 * check hmp will be non-NULL if we are doing the second or more 1103 * hammer2 mounts from the same device. 1104 */ 1105 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1106 if (devvp) { 1107 /* 1108 * Match the device. Due to the way devfs works, 1109 * we may not be able to directly match the vnode pointer, 1110 * so also check to see if the underlying device matches. 1111 */ 1112 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1113 if (hmp->devvp == devvp) 1114 break; 1115 if (devvp->v_rdev && 1116 hmp->devvp->v_rdev == devvp->v_rdev) { 1117 break; 1118 } 1119 } 1120 1121 /* 1122 * If no match this may be a fresh H2 mount, make sure 1123 * the device is not mounted on anything else. 1124 */ 1125 if (hmp == NULL) 1126 error = vfs_mountedon(devvp); 1127 } else if (error == 0) { 1128 /* 1129 * Match the label to a pmp already probed. 1130 */ 1131 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 1132 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 1133 if (pmp->pfs_names[i] && 1134 strcmp(pmp->pfs_names[i], label) == 0) { 1135 hmp = pmp->pfs_hmps[i]; 1136 break; 1137 } 1138 } 1139 if (hmp) 1140 break; 1141 } 1142 if (hmp == NULL) 1143 error = ENOENT; 1144 } 1145 1146 /* 1147 * Open the device if this isn't a secondary mount and construct 1148 * the H2 device mount (hmp). 1149 */ 1150 if (hmp == NULL) { 1151 hammer2_chain_t *schain; 1152 hammer2_xid_t xid; 1153 hammer2_xop_head_t xop; 1154 1155 if (error == 0 && vcount(devvp) > 0) { 1156 kprintf("Primary device already has references\n"); 1157 error = EBUSY; 1158 } 1159 1160 /* 1161 * Now open the device 1162 */ 1163 if (error == 0) { 1164 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 1165 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1166 error = vinvalbuf(devvp, V_SAVE, 0, 0); 1167 if (error == 0) { 1168 error = VOP_OPEN(devvp, 1169 (ronly ? FREAD : FREAD | FWRITE), 1170 FSCRED, NULL); 1171 } 1172 vn_unlock(devvp); 1173 } 1174 if (error && devvp) { 1175 vrele(devvp); 1176 devvp = NULL; 1177 } 1178 if (error) { 1179 lockmgr(&hammer2_mntlk, LK_RELEASE); 1180 return error; 1181 } 1182 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1183 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev); 1184 hmp->ronly = ronly; 1185 hmp->devvp = devvp; 1186 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1187 kmalloc_create(&hmp->mchain, "HAMMER2-chains"); 1188 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1189 RB_INIT(&hmp->iotree); 1190 spin_init(&hmp->io_spin, "h2mount_io"); 1191 spin_init(&hmp->list_spin, "h2mount_list"); 1192 1193 lockinit(&hmp->vollk, "h2vol", 0, 0); 1194 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1195 lockinit(&hmp->bflock, "h2bflk", 0, 0); 1196 1197 /* 1198 * vchain setup. vchain.data is embedded. 1199 * vchain.refs is initialized and will never drop to 0. 1200 * 1201 * NOTE! voldata is not yet loaded. 1202 */ 1203 hmp->vchain.hmp = hmp; 1204 hmp->vchain.refs = 1; 1205 hmp->vchain.data = (void *)&hmp->voldata; 1206 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1207 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1208 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1209 1210 hammer2_chain_core_init(&hmp->vchain); 1211 /* hmp->vchain.u.xxx is left NULL */ 1212 1213 /* 1214 * fchain setup. fchain.data is embedded. 1215 * fchain.refs is initialized and will never drop to 0. 1216 * 1217 * The data is not used but needs to be initialized to 1218 * pass assertion muster. We use this chain primarily 1219 * as a placeholder for the freemap's top-level RBTREE 1220 * so it does not interfere with the volume's topology 1221 * RBTREE. 1222 */ 1223 hmp->fchain.hmp = hmp; 1224 hmp->fchain.refs = 1; 1225 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1226 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1227 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1228 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1229 hmp->fchain.bref.methods = 1230 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1231 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1232 1233 hammer2_chain_core_init(&hmp->fchain); 1234 /* hmp->fchain.u.xxx is left NULL */ 1235 1236 /* 1237 * Install the volume header and initialize fields from 1238 * voldata. 1239 */ 1240 error = hammer2_install_volume_header(hmp); 1241 if (error) { 1242 hammer2_unmount_helper(mp, NULL, hmp); 1243 lockmgr(&hammer2_mntlk, LK_RELEASE); 1244 hammer2_vfs_unmount(mp, MNT_FORCE); 1245 return error; 1246 } 1247 1248 /* 1249 * Really important to get these right or the flush and 1250 * teardown code will get confused. 1251 */ 1252 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL); 1253 spmp = hmp->spmp; 1254 spmp->pfs_hmps[0] = hmp; 1255 1256 /* 1257 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1258 * is inherited from the volume header. 1259 */ 1260 xid = 0; 1261 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1262 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid; 1263 hmp->vchain.pmp = spmp; 1264 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1265 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid; 1266 hmp->fchain.pmp = spmp; 1267 1268 /* 1269 * First locate the super-root inode, which is key 0 1270 * relative to the volume header's blockset. 1271 * 1272 * Then locate the root inode by scanning the directory keyspace 1273 * represented by the label. 1274 */ 1275 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 1276 schain = hammer2_chain_lookup(&parent, &key_dummy, 1277 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 1278 &error, 0); 1279 hammer2_chain_lookup_done(parent); 1280 if (schain == NULL) { 1281 kprintf("hammer2_mount: invalid super-root\n"); 1282 hammer2_unmount_helper(mp, NULL, hmp); 1283 lockmgr(&hammer2_mntlk, LK_RELEASE); 1284 hammer2_vfs_unmount(mp, MNT_FORCE); 1285 return EINVAL; 1286 } 1287 if (schain->error) { 1288 kprintf("hammer2_mount: error %s reading super-root\n", 1289 hammer2_error_str(schain->error)); 1290 hammer2_chain_unlock(schain); 1291 hammer2_chain_drop(schain); 1292 schain = NULL; 1293 hammer2_unmount_helper(mp, NULL, hmp); 1294 lockmgr(&hammer2_mntlk, LK_RELEASE); 1295 hammer2_vfs_unmount(mp, MNT_FORCE); 1296 return EINVAL; 1297 } 1298 1299 /* 1300 * The super-root always uses an inode_tid of 1 when 1301 * creating PFSs. 1302 */ 1303 spmp->inode_tid = 1; 1304 spmp->modify_tid = schain->bref.modify_tid + 1; 1305 1306 /* 1307 * Sanity-check schain's pmp and finish initialization. 1308 * Any chain belonging to the super-root topology should 1309 * have a NULL pmp (not even set to spmp). 1310 */ 1311 ripdata = &hammer2_chain_rdata(schain)->ipdata; 1312 KKASSERT(schain->pmp == NULL); 1313 spmp->pfs_clid = ripdata->meta.pfs_clid; 1314 1315 /* 1316 * Replace the dummy spmp->iroot with a real one. It's 1317 * easier to just do a wholesale replacement than to try 1318 * to update the chain and fixup the iroot fields. 1319 * 1320 * The returned inode is locked with the supplied cluster. 1321 */ 1322 hammer2_dummy_xop_from_chain(&xop, schain); 1323 hammer2_inode_drop(spmp->iroot); 1324 spmp->iroot = NULL; 1325 spmp->iroot = hammer2_inode_get(spmp, &xop, -1, -1); 1326 spmp->spmp_hmp = hmp; 1327 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1328 spmp->pfs_hmps[0] = hmp; 1329 hammer2_inode_ref(spmp->iroot); 1330 hammer2_inode_unlock(spmp->iroot); 1331 hammer2_cluster_unlock(&xop.cluster); 1332 hammer2_chain_drop(schain); 1333 /* do not call hammer2_cluster_drop() on an embedded cluster */ 1334 schain = NULL; /* now invalid */ 1335 /* leave spmp->iroot with one ref */ 1336 1337 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1338 error = hammer2_recovery(hmp); 1339 if (error == 0) 1340 error |= hammer2_fixup_pfses(hmp); 1341 /* XXX do something with error */ 1342 } 1343 hammer2_update_pmps(hmp); 1344 hammer2_iocom_init(hmp); 1345 hammer2_bulkfree_init(hmp); 1346 1347 /* 1348 * Ref the cluster management messaging descriptor. The mount 1349 * program deals with the other end of the communications pipe. 1350 * 1351 * Root mounts typically do not supply one. 1352 */ 1353 if (info.cluster_fd >= 0) { 1354 fp = holdfp(curthread, info.cluster_fd, -1); 1355 if (fp) { 1356 hammer2_cluster_reconnect(hmp, fp); 1357 } else { 1358 kprintf("hammer2_mount: bad cluster_fd!\n"); 1359 } 1360 } 1361 } else { 1362 spmp = hmp->spmp; 1363 if (info.hflags & HMNT2_DEVFLAGS) { 1364 kprintf("hammer2: Warning: mount flags pertaining " 1365 "to the whole device may only be specified " 1366 "on the first mount of the device: %08x\n", 1367 info.hflags & HMNT2_DEVFLAGS); 1368 } 1369 } 1370 1371 /* 1372 * Force local mount (disassociate all PFSs from their clusters). 1373 * Used primarily for debugging. 1374 */ 1375 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1376 1377 /* 1378 * Lookup the mount point under the media-localized super-root. 1379 * Scanning hammer2_pfslist doesn't help us because it represents 1380 * PFS cluster ids which can aggregate several named PFSs together. 1381 * 1382 * cluster->pmp will incorrectly point to spmp and must be fixed 1383 * up later on. 1384 */ 1385 hammer2_inode_lock(spmp->iroot, 0); 1386 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1387 lhc = hammer2_dirhash(label, strlen(label)); 1388 chain = hammer2_chain_lookup(&parent, &key_next, 1389 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1390 &error, 0); 1391 while (chain) { 1392 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1393 strcmp(label, chain->data->ipdata.filename) == 0) { 1394 break; 1395 } 1396 chain = hammer2_chain_next(&parent, chain, &key_next, 1397 key_next, 1398 lhc + HAMMER2_DIRHASH_LOMASK, 1399 &error, 0); 1400 } 1401 if (parent) { 1402 hammer2_chain_unlock(parent); 1403 hammer2_chain_drop(parent); 1404 } 1405 hammer2_inode_unlock(spmp->iroot); 1406 1407 /* 1408 * PFS could not be found? 1409 */ 1410 if (chain == NULL) { 1411 if (error) 1412 kprintf("hammer2_mount: PFS label I/O error\n"); 1413 else 1414 kprintf("hammer2_mount: PFS label not found\n"); 1415 hammer2_unmount_helper(mp, NULL, hmp); 1416 lockmgr(&hammer2_mntlk, LK_RELEASE); 1417 hammer2_vfs_unmount(mp, MNT_FORCE); 1418 1419 return EINVAL; 1420 } 1421 1422 /* 1423 * Acquire the pmp structure (it should have already been allocated 1424 * via hammer2_update_pmps() so do not pass cluster in to add to 1425 * available chains). 1426 * 1427 * Check if the cluster has already been mounted. A cluster can 1428 * only be mounted once, use null mounts to mount additional copies. 1429 */ 1430 if (chain->error) { 1431 kprintf("hammer2_mount: PFS label I/O error\n"); 1432 } else { 1433 ripdata = &chain->data->ipdata; 1434 bref = chain->bref; 1435 pmp = hammer2_pfsalloc(NULL, ripdata, 1436 bref.modify_tid, force_local); 1437 } 1438 hammer2_chain_unlock(chain); 1439 hammer2_chain_drop(chain); 1440 1441 /* 1442 * Finish the mount 1443 */ 1444 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp); 1445 1446 if (pmp->mp) { 1447 kprintf("hammer2_mount: PFS already mounted!\n"); 1448 hammer2_unmount_helper(mp, NULL, hmp); 1449 lockmgr(&hammer2_mntlk, LK_RELEASE); 1450 hammer2_vfs_unmount(mp, MNT_FORCE); 1451 1452 return EBUSY; 1453 } 1454 1455 pmp->hflags = info.hflags; 1456 mp->mnt_flag |= MNT_LOCAL; 1457 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1458 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1459 1460 /* 1461 * required mount structure initializations 1462 */ 1463 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1464 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1465 1466 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1467 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1468 1469 /* 1470 * Optional fields 1471 */ 1472 mp->mnt_iosize_max = MAXPHYS; 1473 1474 /* 1475 * Connect up mount pointers. 1476 */ 1477 hammer2_mount_helper(mp, pmp); 1478 1479 lockmgr(&hammer2_mntlk, LK_RELEASE); 1480 1481 /* 1482 * Finish setup 1483 */ 1484 vfs_getnewfsid(mp); 1485 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1486 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1487 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1488 1489 if (path) { 1490 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1491 MNAMELEN - 1, &size); 1492 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1493 } /* else root mount, already in there */ 1494 1495 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1496 if (path) { 1497 copyinstr(path, mp->mnt_stat.f_mntonname, 1498 sizeof(mp->mnt_stat.f_mntonname) - 1, 1499 &size); 1500 } else { 1501 /* root mount */ 1502 mp->mnt_stat.f_mntonname[0] = '/'; 1503 } 1504 1505 /* 1506 * Initial statfs to prime mnt_stat. 1507 */ 1508 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1509 1510 return 0; 1511 } 1512 1513 /* 1514 * Scan PFSs under the super-root and create hammer2_pfs structures. 1515 */ 1516 static 1517 void 1518 hammer2_update_pmps(hammer2_dev_t *hmp) 1519 { 1520 const hammer2_inode_data_t *ripdata; 1521 hammer2_chain_t *parent; 1522 hammer2_chain_t *chain; 1523 hammer2_blockref_t bref; 1524 hammer2_dev_t *force_local; 1525 hammer2_pfs_t *spmp; 1526 hammer2_pfs_t *pmp; 1527 hammer2_key_t key_next; 1528 int error; 1529 1530 /* 1531 * Force local mount (disassociate all PFSs from their clusters). 1532 * Used primarily for debugging. 1533 */ 1534 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1535 1536 /* 1537 * Lookup mount point under the media-localized super-root. 1538 * 1539 * cluster->pmp will incorrectly point to spmp and must be fixed 1540 * up later on. 1541 */ 1542 spmp = hmp->spmp; 1543 hammer2_inode_lock(spmp->iroot, 0); 1544 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1545 chain = hammer2_chain_lookup(&parent, &key_next, 1546 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1547 &error, 0); 1548 while (chain) { 1549 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 1550 continue; 1551 if (chain->error) { 1552 kprintf("I/O error scanning PFS labels\n"); 1553 } else { 1554 ripdata = &chain->data->ipdata; 1555 bref = chain->bref; 1556 1557 pmp = hammer2_pfsalloc(chain, ripdata, 1558 bref.modify_tid, force_local); 1559 } 1560 chain = hammer2_chain_next(&parent, chain, &key_next, 1561 key_next, HAMMER2_KEY_MAX, 1562 &error, 0); 1563 } 1564 if (parent) { 1565 hammer2_chain_unlock(parent); 1566 hammer2_chain_drop(parent); 1567 } 1568 hammer2_inode_unlock(spmp->iroot); 1569 } 1570 1571 static 1572 int 1573 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1574 struct vnode *devvp, struct ucred *cred) 1575 { 1576 int error; 1577 1578 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 1579 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1580 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL); 1581 vn_unlock(devvp); 1582 error = hammer2_recovery(hmp); 1583 if (error == 0) 1584 error |= hammer2_fixup_pfses(hmp); 1585 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1586 if (error == 0) { 1587 VOP_CLOSE(devvp, FREAD, NULL); 1588 hmp->ronly = 0; 1589 } else { 1590 VOP_CLOSE(devvp, FREAD | FWRITE, NULL); 1591 } 1592 vn_unlock(devvp); 1593 } else { 1594 error = 0; 1595 } 1596 return error; 1597 } 1598 1599 static 1600 int 1601 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1602 { 1603 hammer2_pfs_t *pmp; 1604 int flags; 1605 int error = 0; 1606 1607 pmp = MPTOPMP(mp); 1608 1609 if (pmp == NULL) 1610 return(0); 1611 1612 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1613 1614 /* 1615 * If mount initialization proceeded far enough we must flush 1616 * its vnodes and sync the underlying mount points. Three syncs 1617 * are required to fully flush the filesystem (freemap updates lag 1618 * by one flush, and one extra for safety). 1619 */ 1620 if (mntflags & MNT_FORCE) 1621 flags = FORCECLOSE; 1622 else 1623 flags = 0; 1624 if (pmp->iroot) { 1625 error = vflush(mp, 0, flags); 1626 if (error) 1627 goto failed; 1628 hammer2_vfs_sync(mp, MNT_WAIT); 1629 hammer2_vfs_sync(mp, MNT_WAIT); 1630 hammer2_vfs_sync(mp, MNT_WAIT); 1631 } 1632 1633 /* 1634 * Cleanup the frontend support XOPS threads 1635 */ 1636 hammer2_xop_helper_cleanup(pmp); 1637 1638 if (pmp->mp) 1639 hammer2_unmount_helper(mp, pmp, NULL); 1640 1641 error = 0; 1642 failed: 1643 lockmgr(&hammer2_mntlk, LK_RELEASE); 1644 1645 return (error); 1646 } 1647 1648 /* 1649 * Mount helper, hook the system mount into our PFS. 1650 * The mount lock is held. 1651 * 1652 * We must bump the mount_count on related devices for any 1653 * mounted PFSs. 1654 */ 1655 static 1656 void 1657 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1658 { 1659 hammer2_cluster_t *cluster; 1660 hammer2_chain_t *rchain; 1661 int i; 1662 1663 mp->mnt_data = (qaddr_t)pmp; 1664 pmp->mp = mp; 1665 1666 /* 1667 * After pmp->mp is set we have to adjust hmp->mount_count. 1668 */ 1669 cluster = &pmp->iroot->cluster; 1670 for (i = 0; i < cluster->nchains; ++i) { 1671 rchain = cluster->array[i].chain; 1672 if (rchain == NULL) 1673 continue; 1674 ++rchain->hmp->mount_count; 1675 } 1676 1677 /* 1678 * Create missing Xop threads 1679 */ 1680 hammer2_xop_helper_create(pmp); 1681 } 1682 1683 /* 1684 * Mount helper, unhook the system mount from our PFS. 1685 * The mount lock is held. 1686 * 1687 * If hmp is supplied a mount responsible for being the first to open 1688 * the block device failed and the block device and all PFSs using the 1689 * block device must be cleaned up. 1690 * 1691 * If pmp is supplied multiple devices might be backing the PFS and each 1692 * must be disconnected. This might not be the last PFS using some of the 1693 * underlying devices. Also, we have to adjust our hmp->mount_count 1694 * accounting for the devices backing the pmp which is now undergoing an 1695 * unmount. 1696 */ 1697 static 1698 void 1699 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1700 { 1701 hammer2_cluster_t *cluster; 1702 hammer2_chain_t *rchain; 1703 struct vnode *devvp; 1704 int dumpcnt; 1705 int ronly; 1706 int i; 1707 1708 /* 1709 * If no device supplied this is a high-level unmount and we have to 1710 * to disconnect the mount, adjust mount_count, and locate devices 1711 * that might now have no mounts. 1712 */ 1713 if (pmp) { 1714 KKASSERT(hmp == NULL); 1715 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp); 1716 pmp->mp = NULL; 1717 mp->mnt_data = NULL; 1718 1719 /* 1720 * After pmp->mp is cleared we have to account for 1721 * mount_count. 1722 */ 1723 cluster = &pmp->iroot->cluster; 1724 for (i = 0; i < cluster->nchains; ++i) { 1725 rchain = cluster->array[i].chain; 1726 if (rchain == NULL) 1727 continue; 1728 --rchain->hmp->mount_count; 1729 /* scrapping hmp now may invalidate the pmp */ 1730 } 1731 again: 1732 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1733 if (hmp->mount_count == 0) { 1734 hammer2_unmount_helper(NULL, NULL, hmp); 1735 goto again; 1736 } 1737 } 1738 return; 1739 } 1740 1741 /* 1742 * Try to terminate the block device. We can't terminate it if 1743 * there are still PFSs referencing it. 1744 */ 1745 if (hmp->mount_count) 1746 return; 1747 1748 /* 1749 * Decomission the network before we start messing with the 1750 * device and PFS. 1751 */ 1752 hammer2_iocom_uninit(hmp); 1753 1754 hammer2_bulkfree_uninit(hmp); 1755 hammer2_pfsfree_scan(hmp, 0); 1756 #if 0 1757 hammer2_dev_exlock(hmp); /* XXX order */ 1758 #endif 1759 1760 /* 1761 * Cycle the volume data lock as a safety (probably not needed any 1762 * more). To ensure everything is out we need to flush at least 1763 * three times. (1) The running of the sideq can dirty the 1764 * filesystem, (2) A normal flush can dirty the freemap, and 1765 * (3) ensure that the freemap is fully synchronized. 1766 * 1767 * The next mount's recovery scan can clean everything up but we want 1768 * to leave the filesystem in a 100% clean state on a normal unmount. 1769 */ 1770 #if 0 1771 hammer2_voldata_lock(hmp); 1772 hammer2_voldata_unlock(hmp); 1773 #endif 1774 1775 /* 1776 * Flush whatever is left. Unmounted but modified PFS's might still 1777 * have some dirty chains on them. 1778 */ 1779 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS); 1780 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS); 1781 1782 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1783 hammer2_voldata_modify(hmp); 1784 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP | 1785 HAMMER2_FLUSH_ALL); 1786 } 1787 hammer2_chain_unlock(&hmp->fchain); 1788 1789 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1790 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP | 1791 HAMMER2_FLUSH_ALL); 1792 } 1793 hammer2_chain_unlock(&hmp->vchain); 1794 1795 if ((hmp->vchain.flags | hmp->fchain.flags) & 1796 HAMMER2_CHAIN_FLUSH_MASK) { 1797 kprintf("hammer2_unmount: chains left over " 1798 "after final sync\n"); 1799 kprintf(" vchain %08x\n", hmp->vchain.flags); 1800 kprintf(" fchain %08x\n", hmp->fchain.flags); 1801 1802 if (hammer2_debug & 0x0010) 1803 Debugger("entered debugger"); 1804 } 1805 1806 hammer2_pfsfree_scan(hmp, 1); 1807 1808 KKASSERT(hmp->spmp == NULL); 1809 1810 /* 1811 * Finish up with the device vnode 1812 */ 1813 if ((devvp = hmp->devvp) != NULL) { 1814 ronly = hmp->ronly; 1815 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1816 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n", 1817 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree), 1818 ronly); 1819 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0); 1820 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n", 1821 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree)); 1822 hmp->devvp = NULL; 1823 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL); 1824 vn_unlock(devvp); 1825 vrele(devvp); 1826 devvp = NULL; 1827 } 1828 1829 /* 1830 * Clear vchain/fchain flags that might prevent final cleanup 1831 * of these chains. 1832 */ 1833 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1834 atomic_add_long(&hammer2_count_modified_chains, -1); 1835 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1836 hammer2_pfs_memory_wakeup(hmp->vchain.pmp); 1837 } 1838 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1839 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1840 } 1841 1842 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1843 atomic_add_long(&hammer2_count_modified_chains, -1); 1844 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1845 hammer2_pfs_memory_wakeup(hmp->fchain.pmp); 1846 } 1847 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1848 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1849 } 1850 1851 /* 1852 * Final drop of embedded freemap root chain to 1853 * clean up fchain.core (fchain structure is not 1854 * flagged ALLOCATED so it is cleaned out and then 1855 * left to rot). 1856 */ 1857 hammer2_chain_drop(&hmp->fchain); 1858 1859 /* 1860 * Final drop of embedded volume root chain to clean 1861 * up vchain.core (vchain structure is not flagged 1862 * ALLOCATED so it is cleaned out and then left to 1863 * rot). 1864 */ 1865 dumpcnt = 50; 1866 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1); 1867 dumpcnt = 50; 1868 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1); 1869 #if 0 1870 hammer2_dev_unlock(hmp); 1871 #endif 1872 hammer2_chain_drop(&hmp->vchain); 1873 1874 hammer2_io_cleanup(hmp, &hmp->iotree); 1875 if (hmp->iofree_count) { 1876 kprintf("io_cleanup: %d I/O's left hanging\n", 1877 hmp->iofree_count); 1878 } 1879 1880 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry); 1881 kmalloc_destroy(&hmp->mchain); 1882 kfree(hmp, M_HAMMER2); 1883 } 1884 1885 int 1886 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1887 ino_t ino, struct vnode **vpp) 1888 { 1889 hammer2_xop_lookup_t *xop; 1890 hammer2_pfs_t *pmp; 1891 hammer2_inode_t *ip; 1892 hammer2_tid_t inum; 1893 int error; 1894 1895 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1896 1897 error = 0; 1898 pmp = MPTOPMP(mp); 1899 1900 /* 1901 * Easy if we already have it cached 1902 */ 1903 ip = hammer2_inode_lookup(pmp, inum); 1904 if (ip) { 1905 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1906 *vpp = hammer2_igetv(ip, &error); 1907 hammer2_inode_unlock(ip); 1908 hammer2_inode_drop(ip); /* from lookup */ 1909 1910 return error; 1911 } 1912 1913 /* 1914 * Otherwise we have to find the inode 1915 */ 1916 xop = hammer2_xop_alloc(pmp->iroot, 0); 1917 xop->lhc = inum; 1918 hammer2_xop_start(&xop->head, &hammer2_lookup_desc); 1919 error = hammer2_xop_collect(&xop->head, 0); 1920 1921 if (error == 0) 1922 ip = hammer2_inode_get(pmp, &xop->head, -1, -1); 1923 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1924 1925 if (ip) { 1926 *vpp = hammer2_igetv(ip, &error); 1927 hammer2_inode_unlock(ip); 1928 } else { 1929 *vpp = NULL; 1930 error = ENOENT; 1931 } 1932 return (error); 1933 } 1934 1935 static 1936 int 1937 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1938 { 1939 hammer2_pfs_t *pmp; 1940 struct vnode *vp; 1941 int error; 1942 1943 pmp = MPTOPMP(mp); 1944 if (pmp->iroot == NULL) { 1945 kprintf("hammer2 (%s): no root inode\n", 1946 mp->mnt_stat.f_mntfromname); 1947 *vpp = NULL; 1948 return EINVAL; 1949 } 1950 1951 error = 0; 1952 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1953 1954 while (pmp->inode_tid == 0) { 1955 hammer2_xop_ipcluster_t *xop; 1956 const hammer2_inode_meta_t *meta; 1957 1958 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1959 hammer2_xop_start(&xop->head, &hammer2_ipcluster_desc); 1960 error = hammer2_xop_collect(&xop->head, 0); 1961 1962 if (error == 0) { 1963 meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta; 1964 pmp->iroot->meta = *meta; 1965 pmp->inode_tid = meta->pfs_inum + 1; 1966 hammer2_xop_pdata(&xop->head); 1967 /* meta invalid */ 1968 1969 if (pmp->inode_tid < HAMMER2_INODE_START) 1970 pmp->inode_tid = HAMMER2_INODE_START; 1971 pmp->modify_tid = 1972 xop->head.cluster.focus->bref.modify_tid + 1; 1973 #if 0 1974 kprintf("PFS: Starting inode %jd\n", 1975 (intmax_t)pmp->inode_tid); 1976 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1977 pmp->inode_tid, pmp->modify_tid); 1978 #endif 1979 wakeup(&pmp->iroot); 1980 1981 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1982 1983 /* 1984 * Prime the mount info. 1985 */ 1986 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1987 break; 1988 } 1989 1990 /* 1991 * Loop, try again 1992 */ 1993 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1994 hammer2_inode_unlock(pmp->iroot); 1995 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1996 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1997 if (error == EINTR) 1998 break; 1999 } 2000 2001 if (error) { 2002 hammer2_inode_unlock(pmp->iroot); 2003 *vpp = NULL; 2004 } else { 2005 vp = hammer2_igetv(pmp->iroot, &error); 2006 hammer2_inode_unlock(pmp->iroot); 2007 *vpp = vp; 2008 } 2009 2010 return (error); 2011 } 2012 2013 /* 2014 * Filesystem status 2015 * 2016 * XXX incorporate ipdata->meta.inode_quota and data_quota 2017 */ 2018 static 2019 int 2020 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 2021 { 2022 hammer2_pfs_t *pmp; 2023 hammer2_dev_t *hmp; 2024 hammer2_blockref_t bref; 2025 struct statfs tmp; 2026 int i; 2027 2028 /* 2029 * NOTE: iroot might not have validated the cluster yet. 2030 */ 2031 pmp = MPTOPMP(mp); 2032 2033 bzero(&tmp, sizeof(tmp)); 2034 2035 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2036 hmp = pmp->pfs_hmps[i]; 2037 if (hmp == NULL) 2038 continue; 2039 if (pmp->iroot->cluster.array[i].chain) 2040 bref = pmp->iroot->cluster.array[i].chain->bref; 2041 else 2042 bzero(&bref, sizeof(bref)); 2043 2044 tmp.f_files = bref.embed.stats.inode_count; 2045 tmp.f_ffree = 0; 2046 tmp.f_blocks = hmp->voldata.allocator_size / 2047 mp->mnt_vstat.f_bsize; 2048 tmp.f_bfree = hmp->voldata.allocator_free / 2049 mp->mnt_vstat.f_bsize; 2050 tmp.f_bavail = tmp.f_bfree; 2051 2052 if (cred && cred->cr_uid != 0) { 2053 uint64_t adj; 2054 2055 /* 5% */ 2056 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2057 tmp.f_blocks -= adj; 2058 tmp.f_bfree -= adj; 2059 tmp.f_bavail -= adj; 2060 } 2061 2062 mp->mnt_stat.f_blocks = tmp.f_blocks; 2063 mp->mnt_stat.f_bfree = tmp.f_bfree; 2064 mp->mnt_stat.f_bavail = tmp.f_bavail; 2065 mp->mnt_stat.f_files = tmp.f_files; 2066 mp->mnt_stat.f_ffree = tmp.f_ffree; 2067 2068 *sbp = mp->mnt_stat; 2069 } 2070 return (0); 2071 } 2072 2073 static 2074 int 2075 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 2076 { 2077 hammer2_pfs_t *pmp; 2078 hammer2_dev_t *hmp; 2079 hammer2_blockref_t bref; 2080 struct statvfs tmp; 2081 int i; 2082 2083 /* 2084 * NOTE: iroot might not have validated the cluster yet. 2085 */ 2086 pmp = MPTOPMP(mp); 2087 bzero(&tmp, sizeof(tmp)); 2088 2089 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2090 hmp = pmp->pfs_hmps[i]; 2091 if (hmp == NULL) 2092 continue; 2093 if (pmp->iroot->cluster.array[i].chain) 2094 bref = pmp->iroot->cluster.array[i].chain->bref; 2095 else 2096 bzero(&bref, sizeof(bref)); 2097 2098 tmp.f_files = bref.embed.stats.inode_count; 2099 tmp.f_ffree = 0; 2100 tmp.f_blocks = hmp->voldata.allocator_size / 2101 mp->mnt_vstat.f_bsize; 2102 tmp.f_bfree = hmp->voldata.allocator_free / 2103 mp->mnt_vstat.f_bsize; 2104 tmp.f_bavail = tmp.f_bfree; 2105 2106 if (cred && cred->cr_uid != 0) { 2107 uint64_t adj; 2108 2109 /* 5% */ 2110 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2111 tmp.f_blocks -= adj; 2112 tmp.f_bfree -= adj; 2113 tmp.f_bavail -= adj; 2114 } 2115 2116 mp->mnt_vstat.f_blocks = tmp.f_blocks; 2117 mp->mnt_vstat.f_bfree = tmp.f_bfree; 2118 mp->mnt_vstat.f_bavail = tmp.f_bavail; 2119 mp->mnt_vstat.f_files = tmp.f_files; 2120 mp->mnt_vstat.f_ffree = tmp.f_ffree; 2121 2122 *sbp = mp->mnt_vstat; 2123 } 2124 return (0); 2125 } 2126 2127 /* 2128 * Mount-time recovery (RW mounts) 2129 * 2130 * Updates to the free block table are allowed to lag flushes by one 2131 * transaction. In case of a crash, then on a fresh mount we must do an 2132 * incremental scan of the last committed transaction id and make sure that 2133 * all related blocks have been marked allocated. 2134 * 2135 * The super-root topology and each PFS has its own transaction id domain, 2136 * so we must track PFS boundary transitions. 2137 */ 2138 struct hammer2_recovery_elm { 2139 TAILQ_ENTRY(hammer2_recovery_elm) entry; 2140 hammer2_chain_t *chain; 2141 hammer2_tid_t sync_tid; 2142 }; 2143 2144 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 2145 2146 struct hammer2_recovery_info { 2147 struct hammer2_recovery_list list; 2148 hammer2_tid_t mtid; 2149 int depth; 2150 }; 2151 2152 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 2153 hammer2_chain_t *parent, 2154 struct hammer2_recovery_info *info, 2155 hammer2_tid_t sync_tid); 2156 2157 #define HAMMER2_RECOVERY_MAXDEPTH 10 2158 2159 static 2160 int 2161 hammer2_recovery(hammer2_dev_t *hmp) 2162 { 2163 struct hammer2_recovery_info info; 2164 struct hammer2_recovery_elm *elm; 2165 hammer2_chain_t *parent; 2166 hammer2_tid_t sync_tid; 2167 hammer2_tid_t mirror_tid; 2168 int error; 2169 2170 hammer2_trans_init(hmp->spmp, 0); 2171 2172 sync_tid = hmp->voldata.freemap_tid; 2173 mirror_tid = hmp->voldata.mirror_tid; 2174 2175 kprintf("hammer2 mount \"%s\": ", hmp->devrepname); 2176 if (sync_tid >= mirror_tid) { 2177 kprintf(" no recovery needed\n"); 2178 } else { 2179 kprintf(" freemap recovery %016jx-%016jx\n", 2180 sync_tid + 1, mirror_tid); 2181 } 2182 2183 TAILQ_INIT(&info.list); 2184 info.depth = 0; 2185 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 2186 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 2187 hammer2_chain_lookup_done(parent); 2188 2189 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 2190 TAILQ_REMOVE(&info.list, elm, entry); 2191 parent = elm->chain; 2192 sync_tid = elm->sync_tid; 2193 kfree(elm, M_HAMMER2); 2194 2195 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2196 error |= hammer2_recovery_scan(hmp, parent, &info, 2197 hmp->voldata.freemap_tid); 2198 hammer2_chain_unlock(parent); 2199 hammer2_chain_drop(parent); /* drop elm->chain ref */ 2200 } 2201 2202 hammer2_trans_done(hmp->spmp, 0); 2203 2204 return error; 2205 } 2206 2207 static 2208 int 2209 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 2210 struct hammer2_recovery_info *info, 2211 hammer2_tid_t sync_tid) 2212 { 2213 const hammer2_inode_data_t *ripdata; 2214 hammer2_chain_t *chain; 2215 hammer2_blockref_t bref; 2216 int tmp_error; 2217 int rup_error; 2218 int error; 2219 int first; 2220 2221 /* 2222 * Adjust freemap to ensure that the block(s) are marked allocated. 2223 */ 2224 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2225 hammer2_freemap_adjust(hmp, &parent->bref, 2226 HAMMER2_FREEMAP_DORECOVER); 2227 } 2228 2229 /* 2230 * Check type for recursive scan 2231 */ 2232 switch(parent->bref.type) { 2233 case HAMMER2_BREF_TYPE_VOLUME: 2234 /* data already instantiated */ 2235 break; 2236 case HAMMER2_BREF_TYPE_INODE: 2237 /* 2238 * Must instantiate data for DIRECTDATA test and also 2239 * for recursion. 2240 */ 2241 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2242 ripdata = &hammer2_chain_rdata(parent)->ipdata; 2243 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2244 /* not applicable to recovery scan */ 2245 hammer2_chain_unlock(parent); 2246 return 0; 2247 } 2248 hammer2_chain_unlock(parent); 2249 break; 2250 case HAMMER2_BREF_TYPE_INDIRECT: 2251 /* 2252 * Must instantiate data for recursion 2253 */ 2254 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2255 hammer2_chain_unlock(parent); 2256 break; 2257 case HAMMER2_BREF_TYPE_DIRENT: 2258 case HAMMER2_BREF_TYPE_DATA: 2259 case HAMMER2_BREF_TYPE_FREEMAP: 2260 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2261 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2262 /* not applicable to recovery scan */ 2263 return 0; 2264 break; 2265 default: 2266 return HAMMER2_ERROR_BADBREF; 2267 } 2268 2269 /* 2270 * Defer operation if depth limit reached or if we are crossing a 2271 * PFS boundary. 2272 */ 2273 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2274 struct hammer2_recovery_elm *elm; 2275 2276 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2277 elm->chain = parent; 2278 elm->sync_tid = sync_tid; 2279 hammer2_chain_ref(parent); 2280 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2281 /* unlocked by caller */ 2282 2283 return(0); 2284 } 2285 2286 2287 /* 2288 * Recursive scan of the last flushed transaction only. We are 2289 * doing this without pmp assignments so don't leave the chains 2290 * hanging around after we are done with them. 2291 * 2292 * error Cumulative error this level only 2293 * rup_error Cumulative error for recursion 2294 * tmp_error Specific non-cumulative recursion error 2295 */ 2296 chain = NULL; 2297 first = 1; 2298 rup_error = 0; 2299 error = 0; 2300 2301 for (;;) { 2302 error |= hammer2_chain_scan(parent, &chain, &bref, 2303 &first, 2304 HAMMER2_LOOKUP_NODATA); 2305 2306 /* 2307 * Problem during scan or EOF 2308 */ 2309 if (error) 2310 break; 2311 2312 /* 2313 * If this is a leaf 2314 */ 2315 if (chain == NULL) { 2316 if (bref.mirror_tid > sync_tid) { 2317 hammer2_freemap_adjust(hmp, &bref, 2318 HAMMER2_FREEMAP_DORECOVER); 2319 } 2320 continue; 2321 } 2322 2323 /* 2324 * This may or may not be a recursive node. 2325 */ 2326 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2327 if (bref.mirror_tid > sync_tid) { 2328 ++info->depth; 2329 tmp_error = hammer2_recovery_scan(hmp, chain, 2330 info, sync_tid); 2331 --info->depth; 2332 } else { 2333 tmp_error = 0; 2334 } 2335 2336 /* 2337 * Flush the recovery at the PFS boundary to stage it for 2338 * the final flush of the super-root topology. 2339 */ 2340 if (tmp_error == 0 && 2341 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2342 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2343 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2344 HAMMER2_FLUSH_ALL); 2345 } 2346 rup_error |= tmp_error; 2347 } 2348 return ((error | rup_error) & ~HAMMER2_ERROR_EOF); 2349 } 2350 2351 /* 2352 * This fixes up an error introduced in earlier H2 implementations where 2353 * moving a PFS inode into an indirect block wound up causing the 2354 * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared. 2355 */ 2356 static 2357 int 2358 hammer2_fixup_pfses(hammer2_dev_t *hmp) 2359 { 2360 const hammer2_inode_data_t *ripdata; 2361 hammer2_chain_t *parent; 2362 hammer2_chain_t *chain; 2363 hammer2_key_t key_next; 2364 hammer2_pfs_t *spmp; 2365 int error; 2366 2367 error = 0; 2368 2369 /* 2370 * Lookup mount point under the media-localized super-root. 2371 * 2372 * cluster->pmp will incorrectly point to spmp and must be fixed 2373 * up later on. 2374 */ 2375 spmp = hmp->spmp; 2376 hammer2_inode_lock(spmp->iroot, 0); 2377 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 2378 chain = hammer2_chain_lookup(&parent, &key_next, 2379 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 2380 &error, 0); 2381 while (chain) { 2382 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 2383 continue; 2384 if (chain->error) { 2385 kprintf("I/O error scanning PFS labels\n"); 2386 error |= chain->error; 2387 } else if ((chain->bref.flags & 2388 HAMMER2_BREF_FLAG_PFSROOT) == 0) { 2389 int error2; 2390 2391 ripdata = &chain->data->ipdata; 2392 hammer2_trans_init(hmp->spmp, 0); 2393 error2 = hammer2_chain_modify(chain, 2394 chain->bref.modify_tid, 2395 0, 0); 2396 if (error2 == 0) { 2397 kprintf("hammer2: Correct mis-flagged PFS %s\n", 2398 ripdata->filename); 2399 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT; 2400 } else { 2401 error |= error2; 2402 } 2403 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2404 HAMMER2_FLUSH_ALL); 2405 hammer2_trans_done(hmp->spmp, 0); 2406 } 2407 chain = hammer2_chain_next(&parent, chain, &key_next, 2408 key_next, HAMMER2_KEY_MAX, 2409 &error, 0); 2410 } 2411 if (parent) { 2412 hammer2_chain_unlock(parent); 2413 hammer2_chain_drop(parent); 2414 } 2415 hammer2_inode_unlock(spmp->iroot); 2416 2417 return error; 2418 } 2419 2420 /* 2421 * Sync a mount point; this is called periodically on a per-mount basis from 2422 * the filesystem syncer, and whenever a user issues a sync. 2423 */ 2424 int 2425 hammer2_vfs_sync(struct mount *mp, int waitfor) 2426 { 2427 int error; 2428 2429 error = hammer2_vfs_sync_pmp(MPTOPMP(mp), waitfor); 2430 2431 return error; 2432 } 2433 2434 /* 2435 * Because frontend operations lock vnodes before we get a chance to 2436 * lock the related inode, we can't just acquire a vnode lock without 2437 * risking a deadlock. The frontend may be holding a vnode lock while 2438 * also blocked on our SYNCQ flag while trying to get the inode lock. 2439 * 2440 * To deal with this situation we can check the vnode lock situation 2441 * after locking the inode and perform a work-around. 2442 */ 2443 int 2444 hammer2_vfs_sync_pmp(hammer2_pfs_t *pmp, int waitfor) 2445 { 2446 struct mount *mp; 2447 /*hammer2_xop_flush_t *xop;*/ 2448 /*struct hammer2_sync_info info;*/ 2449 hammer2_inode_t *ip; 2450 hammer2_depend_t *depend; 2451 hammer2_depend_t *depend_next; 2452 struct vnode *vp; 2453 uint32_t pass2; 2454 int error; 2455 int dorestart; 2456 2457 mp = pmp->mp; 2458 2459 /* 2460 * Move all inodes on sideq to syncq. This will clear sideq. 2461 * This should represent all flushable inodes. These inodes 2462 * will already have refs due to being on syncq or sideq. We 2463 * must do this all at once with the spinlock held to ensure that 2464 * all inode dependencies are part of the same flush. 2465 * 2466 * We should be able to do this asynchronously from frontend 2467 * operations because we will be locking the inodes later on 2468 * to actually flush them, and that will partition any frontend 2469 * op using the same inode. Either it has already locked the 2470 * inode and we will block, or it has not yet locked the inode 2471 * and it will block until we are finished flushing that inode. 2472 * 2473 * When restarting, only move the inodes flagged as PASS2 from 2474 * SIDEQ to SYNCQ. PASS2 propagation by inode_lock4() and 2475 * inode_depend() are atomic with the spin-lock. 2476 */ 2477 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2478 #ifdef HAMMER2_DEBUG_SYNC 2479 kprintf("FILESYSTEM SYNC BOUNDARY\n"); 2480 #endif 2481 dorestart = 0; 2482 2483 /* 2484 * Move inodes from depq to syncq, releasing the related 2485 * depend structures. 2486 */ 2487 restart: 2488 #ifdef HAMMER2_DEBUG_SYNC 2489 kprintf("FILESYSTEM SYNC RESTART (%d)\n", dorestart); 2490 #endif 2491 hammer2_trans_setflags(pmp, 0/*HAMMER2_TRANS_COPYQ*/); 2492 hammer2_trans_clearflags(pmp, HAMMER2_TRANS_RESCAN); 2493 2494 /* 2495 * Move inodes from depq to syncq. When restarting, only depq's 2496 * marked pass2 are moved. 2497 */ 2498 hammer2_spin_ex(&pmp->list_spin); 2499 depend_next = TAILQ_FIRST(&pmp->depq); 2500 2501 while ((depend = depend_next) != NULL) { 2502 depend_next = TAILQ_NEXT(depend, entry); 2503 if (dorestart && depend->pass2 == 0) 2504 continue; 2505 TAILQ_FOREACH(ip, &depend->sideq, entry) { 2506 KKASSERT(ip->flags & HAMMER2_INODE_SIDEQ); 2507 atomic_set_int(&ip->flags, HAMMER2_INODE_SYNCQ); 2508 atomic_clear_int(&ip->flags, HAMMER2_INODE_SIDEQ); 2509 ip->depend = NULL; 2510 } 2511 TAILQ_CONCAT(&pmp->syncq, &depend->sideq, entry); 2512 pmp->sideq_count -= depend->count; 2513 depend->count = 0; 2514 depend->pass2 = 0; 2515 TAILQ_REMOVE(&pmp->depq, depend, entry); 2516 } 2517 2518 hammer2_spin_unex(&pmp->list_spin); 2519 hammer2_trans_clearflags(pmp, /*HAMMER2_TRANS_COPYQ |*/ 2520 HAMMER2_TRANS_WAITING); 2521 dorestart = 0; 2522 2523 /* 2524 * sideq_count may have dropped enough to allow us to unstall 2525 * the frontend. 2526 */ 2527 hammer2_pfs_memory_inc(pmp); 2528 hammer2_pfs_memory_wakeup(pmp); 2529 2530 /* 2531 * Now run through all inodes on syncq. 2532 * 2533 * Flush transactions only interlock with other flush transactions. 2534 * Any conflicting frontend operations will block on the inode, but 2535 * may hold a vnode lock while doing so. 2536 */ 2537 hammer2_spin_ex(&pmp->list_spin); 2538 while ((ip = TAILQ_FIRST(&pmp->syncq)) != NULL) { 2539 /* 2540 * Remove the inode from the SYNCQ, transfer the syncq ref 2541 * to us. We must clear SYNCQ to allow any potential 2542 * front-end deadlock to proceed. We must set PASS2 so 2543 * the dependency code knows what to do. 2544 */ 2545 pass2 = ip->flags; 2546 cpu_ccfence(); 2547 if (atomic_cmpset_int(&ip->flags, 2548 pass2, 2549 (pass2 & ~(HAMMER2_INODE_SYNCQ | 2550 HAMMER2_INODE_SYNCQ_WAKEUP)) | 2551 HAMMER2_INODE_SYNCQ_PASS2) == 0) { 2552 continue; 2553 } 2554 TAILQ_REMOVE(&pmp->syncq, ip, entry); 2555 hammer2_spin_unex(&pmp->list_spin); 2556 if (pass2 & HAMMER2_INODE_SYNCQ_WAKEUP) 2557 wakeup(&ip->flags); 2558 2559 /* 2560 * Relock the inode, and we inherit a ref from the above. 2561 * We will check for a race after we acquire the vnode. 2562 */ 2563 hammer2_mtx_ex(&ip->lock); 2564 2565 /* 2566 * We need the vp in order to vfsync() dirty buffers, so if 2567 * one isn't attached we can skip it. 2568 * 2569 * Ordering the inode lock and then the vnode lock has the 2570 * potential to deadlock. If we had left SYNCQ set that could 2571 * also deadlock us against the frontend even if we don't hold 2572 * any locks, but the latter is not a problem now since we 2573 * cleared it. igetv will temporarily release the inode lock 2574 * in a safe manner to work-around the deadlock. 2575 * 2576 * Unfortunately it is still possible to deadlock when the 2577 * frontend obtains multiple inode locks, because all the 2578 * related vnodes are already locked (nor can the vnode locks 2579 * be released and reacquired without messing up RECLAIM and 2580 * INACTIVE sequencing). 2581 * 2582 * The solution for now is to move the vp back onto SIDEQ 2583 * and set dorestart, which will restart the flush after we 2584 * exhaust the current SYNCQ. Note that additional 2585 * dependencies may build up, so we definitely need to move 2586 * the whole SIDEQ back to SYNCQ when we restart. 2587 */ 2588 vp = ip->vp; 2589 if (vp) { 2590 if (vget(vp, LK_EXCLUSIVE|LK_NOWAIT)) { 2591 /* 2592 * Failed to get the vnode, requeue the inode 2593 * (PASS2 is already set so it will be found 2594 * again on the restart). 2595 * 2596 * Then unlock, possibly sleep, and retry 2597 * later. We sleep if PASS2 was *previously* 2598 * set, before we set it again above. 2599 */ 2600 vp = NULL; 2601 dorestart = 1; 2602 #ifdef HAMMER2_DEBUG_SYNC 2603 kprintf("inum %ld (sync delayed by vnode)\n", 2604 (long)ip->meta.inum); 2605 #endif 2606 hammer2_inode_delayed_sideq(ip); 2607 2608 hammer2_mtx_unlock(&ip->lock); 2609 hammer2_inode_drop(ip); 2610 2611 if (pass2 & HAMMER2_INODE_SYNCQ_PASS2) { 2612 tsleep(&dorestart, 0, "h2syndel", 2); 2613 } 2614 hammer2_spin_ex(&pmp->list_spin); 2615 continue; 2616 } 2617 } else { 2618 vp = NULL; 2619 } 2620 2621 /* 2622 * If the inode wound up on a SIDEQ again it will already be 2623 * prepped for another PASS2. In this situation if we flush 2624 * it now we will just wind up flushing it again in the same 2625 * syncer run, so we might as well not flush it now. 2626 */ 2627 if (ip->flags & HAMMER2_INODE_SIDEQ) { 2628 hammer2_mtx_unlock(&ip->lock); 2629 hammer2_inode_drop(ip); 2630 if (vp) 2631 vput(vp); 2632 dorestart = 1; 2633 hammer2_spin_ex(&pmp->list_spin); 2634 continue; 2635 } 2636 2637 /* 2638 * Ok we have the inode exclusively locked and if vp is 2639 * not NULL that will also be exclusively locked. Do the 2640 * meat of the flush. 2641 * 2642 * vp token needed for v_rbdirty_tree check / vclrisdirty 2643 * sequencing. Though we hold the vnode exclusively so 2644 * we shouldn't need to hold the token also in this case. 2645 */ 2646 if (vp) { 2647 vfsync(vp, MNT_WAIT, 1, NULL, NULL); 2648 bio_track_wait(&vp->v_track_write, 0, 0); /* XXX */ 2649 } 2650 2651 /* 2652 * If the inode has not yet been inserted into the tree 2653 * we must do so. Then sync and flush it. The flush should 2654 * update the parent. 2655 */ 2656 if (ip->flags & HAMMER2_INODE_DELETING) { 2657 #ifdef HAMMER2_DEBUG_SYNC 2658 kprintf("inum %ld destroy\n", (long)ip->meta.inum); 2659 #endif 2660 hammer2_inode_chain_des(ip); 2661 atomic_add_long(&hammer2_iod_inode_deletes, 1); 2662 } else if (ip->flags & HAMMER2_INODE_CREATING) { 2663 #ifdef HAMMER2_DEBUG_SYNC 2664 kprintf("inum %ld insert\n", (long)ip->meta.inum); 2665 #endif 2666 hammer2_inode_chain_ins(ip); 2667 atomic_add_long(&hammer2_iod_inode_creates, 1); 2668 } 2669 #ifdef HAMMER2_DEBUG_SYNC 2670 kprintf("inum %ld chain-sync\n", (long)ip->meta.inum); 2671 #endif 2672 2673 /* 2674 * Because I kinda messed up the design and index the inodes 2675 * under the root inode, along side the directory entries, 2676 * we can't flush the inode index under the iroot until the 2677 * end. If we do it now we might miss effects created by 2678 * other inodes on the SYNCQ. 2679 * 2680 * Do a normal (non-FSSYNC) flush instead, which allows the 2681 * vnode code to work the same. We don't want to force iroot 2682 * back onto the SIDEQ, and we also don't want the flush code 2683 * to update pfs_iroot_blocksets until the final flush later. 2684 * 2685 * XXX at the moment this will likely result in a double-flush 2686 * of the iroot chain. 2687 */ 2688 hammer2_inode_chain_sync(ip); 2689 if (ip == pmp->iroot) { 2690 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 2691 } else { 2692 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2693 HAMMER2_XOP_FSSYNC); 2694 } 2695 if (vp) { 2696 lwkt_gettoken(&vp->v_token); 2697 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 2698 HAMMER2_INODE_RESIZED | 2699 HAMMER2_INODE_DIRTYDATA)) == 0 && 2700 RB_EMPTY(&vp->v_rbdirty_tree) && 2701 !bio_track_active(&vp->v_track_write)) { 2702 vclrisdirty(vp); 2703 } else { 2704 hammer2_inode_delayed_sideq(ip); 2705 } 2706 lwkt_reltoken(&vp->v_token); 2707 vput(vp); 2708 vp = NULL; /* safety */ 2709 } 2710 atomic_clear_int(&ip->flags, HAMMER2_INODE_SYNCQ_PASS2); 2711 hammer2_inode_unlock(ip); /* unlock+drop */ 2712 /* ip pointer invalid */ 2713 2714 /* 2715 * If the inode got dirted after we dropped our locks, 2716 * it will have already been moved back to the SIDEQ. 2717 */ 2718 hammer2_spin_ex(&pmp->list_spin); 2719 } 2720 hammer2_spin_unex(&pmp->list_spin); 2721 if (dorestart || (pmp->trans.flags & HAMMER2_TRANS_RESCAN)) { 2722 #ifdef HAMMER2_DEBUG_SYNC 2723 kprintf("FILESYSTEM SYNC STAGE 1 RESTART\n"); 2724 /*tsleep(&dorestart, 0, "h2STG1-R", hz*20);*/ 2725 #endif 2726 dorestart = 1; 2727 goto restart; 2728 } 2729 #ifdef HAMMER2_DEBUG_SYNC 2730 kprintf("FILESYSTEM SYNC STAGE 2 BEGIN\n"); 2731 /*tsleep(&dorestart, 0, "h2STG2", hz*20);*/ 2732 #endif 2733 2734 /* 2735 * We have to flush the PFS root last, even if it does not appear to 2736 * be dirty, because all the inodes in the PFS are indexed under it. 2737 * The normal flushing of iroot above would only occur if directory 2738 * entries under the root were changed. 2739 * 2740 * Specifying VOLHDR will cause an additionl flush of hmp->spmp 2741 * for the media making up the cluster. 2742 */ 2743 if ((ip = pmp->iroot) != NULL) { 2744 hammer2_inode_ref(ip); 2745 hammer2_mtx_ex(&ip->lock); 2746 hammer2_inode_chain_sync(ip); 2747 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2748 HAMMER2_XOP_FSSYNC | 2749 HAMMER2_XOP_VOLHDR); 2750 hammer2_inode_unlock(ip); /* unlock+drop */ 2751 } 2752 #ifdef HAMMER2_DEBUG_SYNC 2753 kprintf("FILESYSTEM SYNC STAGE 2 DONE\n"); 2754 #endif 2755 2756 /* 2757 * device bioq sync 2758 */ 2759 hammer2_bioq_sync(pmp); 2760 2761 #if 0 2762 info.pass = 1; 2763 info.waitfor = MNT_WAIT; 2764 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2765 2766 info.pass = 2; 2767 info.waitfor = MNT_WAIT; 2768 vsyncscan(mp, flags, hammer2_sync_scan2, &info); 2769 #endif 2770 #if 0 2771 /* 2772 * Generally speaking we now want to flush the media topology from 2773 * the iroot through to the inodes. The flush stops at any inode 2774 * boundary, which allows the frontend to continue running concurrent 2775 * modifying operations on inodes (including kernel flushes of 2776 * buffers) without interfering with the main sync. 2777 * 2778 * Use the XOP interface to concurrently flush all nodes to 2779 * synchronize the PFSROOT subtopology to the media. A standard 2780 * end-of-scan ENOENT error indicates cluster sufficiency. 2781 * 2782 * Note that this flush will not be visible on crash recovery until 2783 * we flush the super-root topology in the next loop. 2784 * 2785 * XXX For now wait for all flushes to complete. 2786 */ 2787 if (mp && (ip = pmp->iroot) != NULL) { 2788 /* 2789 * If unmounting try to flush everything including any 2790 * sub-trees under inodes, just in case there is dangling 2791 * modified data, as a safety. Otherwise just flush up to 2792 * the inodes in this stage. 2793 */ 2794 kprintf("MP & IROOT\n"); 2795 #ifdef HAMMER2_DEBUG_SYNC 2796 kprintf("FILESYSTEM SYNC STAGE 3 IROOT BEGIN\n"); 2797 #endif 2798 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 2799 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING | 2800 HAMMER2_XOP_VOLHDR | 2801 HAMMER2_XOP_FSSYNC | 2802 HAMMER2_XOP_INODE_STOP); 2803 } else { 2804 xop = hammer2_xop_alloc(ip, HAMMER2_XOP_MODIFYING | 2805 HAMMER2_XOP_INODE_STOP | 2806 HAMMER2_XOP_VOLHDR | 2807 HAMMER2_XOP_FSSYNC | 2808 HAMMER2_XOP_INODE_STOP); 2809 } 2810 hammer2_xop_start(&xop->head, &hammer2_inode_flush_desc); 2811 error = hammer2_xop_collect(&xop->head, 2812 HAMMER2_XOP_COLLECT_WAITALL); 2813 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 2814 #ifdef HAMMER2_DEBUG_SYNC 2815 kprintf("FILESYSTEM SYNC STAGE 3 IROOT END\n"); 2816 #endif 2817 if (error == HAMMER2_ERROR_ENOENT) 2818 error = 0; 2819 else 2820 error = hammer2_error_to_errno(error); 2821 } else { 2822 error = 0; 2823 } 2824 #endif 2825 error = 0; /* XXX */ 2826 hammer2_trans_done(pmp, HAMMER2_TRANS_ISFLUSH); 2827 2828 return (error); 2829 } 2830 2831 static 2832 int 2833 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2834 { 2835 hammer2_inode_t *ip; 2836 2837 KKASSERT(MAXFIDSZ >= 16); 2838 ip = VTOI(vp); 2839 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2840 fhp->fid_ext = 0; 2841 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2842 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2843 2844 return 0; 2845 } 2846 2847 static 2848 int 2849 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2850 struct fid *fhp, struct vnode **vpp) 2851 { 2852 hammer2_pfs_t *pmp; 2853 hammer2_tid_t inum; 2854 int error; 2855 2856 pmp = MPTOPMP(mp); 2857 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2858 if (vpp) { 2859 if (inum == 1) 2860 error = hammer2_vfs_root(mp, vpp); 2861 else 2862 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2863 } else { 2864 error = 0; 2865 } 2866 if (error) 2867 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error); 2868 return error; 2869 } 2870 2871 static 2872 int 2873 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2874 int *exflagsp, struct ucred **credanonp) 2875 { 2876 hammer2_pfs_t *pmp; 2877 struct netcred *np; 2878 int error; 2879 2880 pmp = MPTOPMP(mp); 2881 np = vfs_export_lookup(mp, &pmp->export, nam); 2882 if (np) { 2883 *exflagsp = np->netc_exflags; 2884 *credanonp = &np->netc_anon; 2885 error = 0; 2886 } else { 2887 error = EACCES; 2888 } 2889 return error; 2890 } 2891 2892 /* 2893 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume 2894 * header into the HMP 2895 * 2896 * XXX read four volhdrs and use the one with the highest TID whos CRC 2897 * matches. 2898 * 2899 * XXX check iCRCs. 2900 * 2901 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to 2902 * nonexistant locations. 2903 * 2904 * XXX Record selected volhdr and ring updates to each of 4 volhdrs 2905 */ 2906 static 2907 int 2908 hammer2_install_volume_header(hammer2_dev_t *hmp) 2909 { 2910 hammer2_volume_data_t *vd; 2911 struct buf *bp; 2912 hammer2_crc32_t crc0, crc, bcrc0, bcrc; 2913 int error_reported; 2914 int error; 2915 int valid; 2916 int i; 2917 2918 error_reported = 0; 2919 error = 0; 2920 valid = 0; 2921 bp = NULL; 2922 2923 /* 2924 * There are up to 4 copies of the volume header (syncs iterate 2925 * between them so there is no single master). We don't trust the 2926 * volu_size field so we don't know precisely how large the filesystem 2927 * is, so depend on the OS to return an error if we go beyond the 2928 * block device's EOF. 2929 */ 2930 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) { 2931 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64, 2932 HAMMER2_VOLUME_BYTES, &bp); 2933 if (error) { 2934 brelse(bp); 2935 bp = NULL; 2936 continue; 2937 } 2938 2939 vd = (struct hammer2_volume_data *) bp->b_data; 2940 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) && 2941 (vd->magic != HAMMER2_VOLUME_ID_ABO)) { 2942 brelse(bp); 2943 bp = NULL; 2944 continue; 2945 } 2946 2947 if (vd->magic == HAMMER2_VOLUME_ID_ABO) { 2948 /* XXX: Reversed-endianness filesystem */ 2949 kprintf("hammer2: reverse-endian filesystem detected"); 2950 brelse(bp); 2951 bp = NULL; 2952 continue; 2953 } 2954 2955 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0]; 2956 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF, 2957 HAMMER2_VOLUME_ICRC0_SIZE); 2958 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1]; 2959 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF, 2960 HAMMER2_VOLUME_ICRC1_SIZE); 2961 if ((crc0 != crc) || (bcrc0 != bcrc)) { 2962 kprintf("hammer2 volume header crc " 2963 "mismatch copy #%d %08x/%08x\n", 2964 i, crc0, crc); 2965 error_reported = 1; 2966 brelse(bp); 2967 bp = NULL; 2968 continue; 2969 } 2970 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) { 2971 valid = 1; 2972 hmp->voldata = *vd; 2973 hmp->volhdrno = i; 2974 } 2975 brelse(bp); 2976 bp = NULL; 2977 } 2978 if (valid) { 2979 hmp->volsync = hmp->voldata; 2980 hmp->free_reserved = hmp->voldata.allocator_size / 20; 2981 error = 0; 2982 if (error_reported || bootverbose || 1) { /* 1/DEBUG */ 2983 kprintf("hammer2: using volume header #%d\n", 2984 hmp->volhdrno); 2985 } 2986 } else { 2987 error = EINVAL; 2988 kprintf("hammer2: no valid volume headers found!\n"); 2989 } 2990 return (error); 2991 } 2992 2993 /* 2994 * This handles hysteresis on regular file flushes. Because the BIOs are 2995 * routed to a thread it is possible for an excessive number to build up 2996 * and cause long front-end stalls long before the runningbuffspace limit 2997 * is hit, so we implement hammer2_flush_pipe to control the 2998 * hysteresis. 2999 * 3000 * This is a particular problem when compression is used. 3001 */ 3002 void 3003 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 3004 { 3005 atomic_add_int(&pmp->count_lwinprog, 1); 3006 } 3007 3008 void 3009 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 3010 { 3011 int lwinprog; 3012 3013 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 3014 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 3015 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 3016 atomic_clear_int(&pmp->count_lwinprog, 3017 HAMMER2_LWINPROG_WAITING); 3018 wakeup(&pmp->count_lwinprog); 3019 } 3020 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 3021 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 3022 atomic_clear_int(&pmp->count_lwinprog, 3023 HAMMER2_LWINPROG_WAITING0); 3024 wakeup(&pmp->count_lwinprog); 3025 } 3026 } 3027 3028 void 3029 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 3030 { 3031 int lwinprog; 3032 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 3033 HAMMER2_LWINPROG_WAITING0; 3034 3035 for (;;) { 3036 lwinprog = pmp->count_lwinprog; 3037 cpu_ccfence(); 3038 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 3039 break; 3040 tsleep_interlock(&pmp->count_lwinprog, 0); 3041 atomic_set_int(&pmp->count_lwinprog, lwflag); 3042 lwinprog = pmp->count_lwinprog; 3043 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 3044 break; 3045 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 3046 } 3047 } 3048 3049 /* 3050 * It is possible for an excessive number of dirty chains or dirty inodes 3051 * to build up. When this occurs we start an asynchronous filesystem sync. 3052 * If the level continues to build up, we stall, waiting for it to drop, 3053 * with some hysteresis. 3054 * 3055 * We limit the stall to two seconds per call. 3056 * 3057 * This relies on the kernel calling hammer2_vfs_modifying() prior to 3058 * obtaining any vnode locks before making a modifying VOP call. 3059 */ 3060 static void 3061 hammer2_vfs_modifying(struct mount *mp) 3062 { 3063 hammer2_pfs_memory_wait(MPTOPMP(mp)); 3064 } 3065 3066 /* 3067 * Initiate an asynchronous filesystem sync and, with hysteresis, 3068 * stall if the internal data structure count becomes too bloated. 3069 */ 3070 void 3071 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 3072 { 3073 uint32_t waiting; 3074 int loops; 3075 3076 if (pmp == NULL || pmp->mp == NULL) 3077 return; 3078 3079 for (loops = 0; loops < 2; ++loops) { 3080 waiting = pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK; 3081 cpu_ccfence(); 3082 3083 /* 3084 * Start the syncer running at 1/2 the limit 3085 */ 3086 if (waiting > hammer2_limit_dirty_chains / 2 || 3087 pmp->sideq_count > hammer2_limit_dirty_inodes / 2) { 3088 trigger_syncer(pmp->mp); 3089 } 3090 3091 /* 3092 * Stall at the limit waiting for the counts to drop. 3093 * This code will typically be woken up once the count 3094 * drops below 3/4 the limit, or in one second. 3095 */ 3096 if (waiting < hammer2_limit_dirty_chains && 3097 pmp->sideq_count < hammer2_limit_dirty_inodes) { 3098 break; 3099 } 3100 tsleep_interlock(&pmp->inmem_dirty_chains, 0); 3101 atomic_set_int(&pmp->inmem_dirty_chains, 3102 HAMMER2_DIRTYCHAIN_WAITING); 3103 if (waiting < hammer2_limit_dirty_chains && 3104 pmp->sideq_count < hammer2_limit_dirty_inodes) { 3105 break; 3106 } 3107 trigger_syncer(pmp->mp); 3108 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED, "h2memw", hz); 3109 #if 0 3110 limit = pmp->mp->mnt_nvnodelistsize / 10; 3111 if (limit < hammer2_limit_dirty_chains) 3112 limit = hammer2_limit_dirty_chains; 3113 if (limit < 1000) 3114 limit = 1000; 3115 #endif 3116 } 3117 } 3118 3119 void 3120 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 3121 { 3122 if (pmp) { 3123 atomic_add_int(&pmp->inmem_dirty_chains, 1); 3124 } 3125 } 3126 3127 void 3128 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp) 3129 { 3130 uint32_t waiting; 3131 3132 if (pmp) { 3133 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1); 3134 /* don't need --waiting to test flag */ 3135 3136 if ((waiting & HAMMER2_DIRTYCHAIN_WAITING) && 3137 (pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK) <= 3138 hammer2_limit_dirty_chains * 2 / 3 && 3139 pmp->sideq_count <= hammer2_limit_dirty_inodes * 2 / 3) { 3140 atomic_clear_int(&pmp->inmem_dirty_chains, 3141 HAMMER2_DIRTYCHAIN_WAITING); 3142 wakeup(&pmp->inmem_dirty_chains); 3143 } 3144 } 3145 } 3146 3147 /* 3148 * Returns 0 if the filesystem has tons of free space 3149 * Returns 1 if the filesystem has less than 10% remaining 3150 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining. 3151 */ 3152 int 3153 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred) 3154 { 3155 hammer2_pfs_t *pmp; 3156 hammer2_dev_t *hmp; 3157 hammer2_off_t free_reserved; 3158 hammer2_off_t free_nominal; 3159 int i; 3160 3161 pmp = ip->pmp; 3162 3163 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) { 3164 free_reserved = HAMMER2_SEGSIZE; 3165 free_nominal = 0x7FFFFFFFFFFFFFFFLLU; 3166 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 3167 hmp = pmp->pfs_hmps[i]; 3168 if (hmp == NULL) 3169 continue; 3170 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER && 3171 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER) 3172 continue; 3173 3174 if (free_nominal > hmp->voldata.allocator_free) 3175 free_nominal = hmp->voldata.allocator_free; 3176 if (free_reserved < hmp->free_reserved) 3177 free_reserved = hmp->free_reserved; 3178 } 3179 3180 /* 3181 * SMP races ok 3182 */ 3183 pmp->free_reserved = free_reserved; 3184 pmp->free_nominal = free_nominal; 3185 pmp->free_ticks = ticks; 3186 } else { 3187 free_reserved = pmp->free_reserved; 3188 free_nominal = pmp->free_nominal; 3189 } 3190 if (cred && cred->cr_uid != 0) { 3191 if ((int64_t)(free_nominal - bytes) < 3192 (int64_t)free_reserved) { 3193 return 2; 3194 } 3195 } else { 3196 if ((int64_t)(free_nominal - bytes) < 3197 (int64_t)free_reserved / 2) { 3198 return 2; 3199 } 3200 } 3201 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2) 3202 return 1; 3203 return 0; 3204 } 3205 3206 /* 3207 * Debugging 3208 */ 3209 void 3210 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx, 3211 u_int flags) 3212 { 3213 hammer2_chain_t *scan; 3214 hammer2_chain_t *parent; 3215 3216 --*countp; 3217 if (*countp == 0) { 3218 kprintf("%*.*s...\n", tab, tab, ""); 3219 return; 3220 } 3221 if (*countp < 0) 3222 return; 3223 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n", 3224 tab, tab, "", pfx, 3225 chain, chain->bref.type, 3226 chain->bref.key, chain->bref.keybits, 3227 chain->bref.mirror_tid); 3228 3229 kprintf("%*.*s [%08x] (%s) refs=%d", 3230 tab, tab, "", 3231 chain->flags, 3232 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE && 3233 chain->data) ? (char *)chain->data->ipdata.filename : "?"), 3234 chain->refs); 3235 3236 parent = chain->parent; 3237 if (parent) 3238 kprintf("\n%*.*s p=%p [pflags %08x prefs %d", 3239 tab, tab, "", 3240 parent, parent->flags, parent->refs); 3241 if (RB_EMPTY(&chain->core.rbtree)) { 3242 kprintf("\n"); 3243 } else { 3244 kprintf(" {\n"); 3245 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) { 3246 if ((scan->flags & flags) || flags == (u_int)-1) { 3247 hammer2_dump_chain(scan, tab + 4, countp, 'a', 3248 flags); 3249 } 3250 } 3251 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data) 3252 kprintf("%*.*s}(%s)\n", tab, tab, "", 3253 chain->data->ipdata.filename); 3254 else 3255 kprintf("%*.*s}\n", tab, tab, ""); 3256 } 3257 } 3258