1 /* 2 * Copyright (c) 2011-2023 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/vfsops.h> 43 #include <sys/sysctl.h> 44 #include <sys/socket.h> 45 #include <sys/objcache.h> 46 #include <sys/proc.h> 47 #include <sys/lock.h> 48 #include <sys/file.h> 49 50 #include "hammer2.h" 51 52 TAILQ_HEAD(hammer2_mntlist, hammer2_dev); 53 static struct hammer2_mntlist hammer2_mntlist; 54 55 struct hammer2_pfslist hammer2_pfslist; 56 struct hammer2_pfslist hammer2_spmplist; 57 struct lock hammer2_mntlk; 58 59 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT; 60 int hammer2_debug; 61 int hammer2_aux_flags; 62 int hammer2_xop_nthreads; 63 int hammer2_xop_sgroups; 64 int hammer2_xop_xgroups; 65 int hammer2_xop_xbase; 66 int hammer2_xop_mod; 67 long hammer2_debug_inode; 68 int hammer2_cluster_meta_read = 1; /* physical read-ahead */ 69 int hammer2_cluster_data_read = 4; /* physical read-ahead */ 70 int hammer2_cluster_write = 0; /* physical write clustering */ 71 int hammer2_dedup_enable = 1; 72 int hammer2_always_compress = 0; /* always try to compress */ 73 int hammer2_flush_pipe = 100; 74 int hammer2_dio_count; 75 int hammer2_dio_limit = 256; 76 int hammer2_bulkfree_tps = 5000; 77 int hammer2_spread_workers; 78 int hammer2_limit_saved_depth; 79 long hammer2_chain_allocs; 80 long hammer2_limit_saved_chains; 81 long hammer2_limit_dirty_chains; 82 long hammer2_limit_dirty_inodes; 83 long hammer2_count_modified_chains; 84 long hammer2_iod_file_read; 85 long hammer2_iod_meta_read; 86 long hammer2_iod_indr_read; 87 long hammer2_iod_fmap_read; 88 long hammer2_iod_volu_read; 89 long hammer2_iod_file_write; 90 long hammer2_iod_file_wembed; 91 long hammer2_iod_file_wzero; 92 long hammer2_iod_file_wdedup; 93 long hammer2_iod_meta_write; 94 long hammer2_iod_indr_write; 95 long hammer2_iod_fmap_write; 96 long hammer2_iod_volu_write; 97 static long hammer2_iod_inode_creates; 98 static long hammer2_iod_inode_deletes; 99 100 long hammer2_process_icrc32; 101 long hammer2_process_xxhash64; 102 103 MALLOC_DECLARE(M_HAMMER2_CBUFFER); 104 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer", 105 "Buffer used for compression."); 106 107 MALLOC_DECLARE(M_HAMMER2_DEBUFFER); 108 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer", 109 "Buffer used for decompression."); 110 111 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem"); 112 113 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD, 114 &hammer2_supported_version, 0, ""); 115 SYSCTL_INT(_vfs_hammer2, OID_AUTO, aux_flags, CTLFLAG_RW, 116 &hammer2_aux_flags, 0, ""); 117 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW, 118 &hammer2_debug, 0, ""); 119 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, debug_inode, CTLFLAG_RW, 120 &hammer2_debug_inode, 0, ""); 121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, spread_workers, CTLFLAG_RW, 122 &hammer2_spread_workers, 0, ""); 123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW, 124 &hammer2_cluster_meta_read, 0, ""); 125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW, 126 &hammer2_cluster_data_read, 0, ""); 127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW, 128 &hammer2_cluster_write, 0, ""); 129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW, 130 &hammer2_dedup_enable, 0, ""); 131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW, 132 &hammer2_always_compress, 0, ""); 133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW, 134 &hammer2_flush_pipe, 0, ""); 135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW, 136 &hammer2_bulkfree_tps, 0, ""); 137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RD, 138 &hammer2_chain_allocs, 0, ""); 139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_saved_chains, CTLFLAG_RW, 140 &hammer2_limit_saved_chains, 0, ""); 141 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_saved_depth, CTLFLAG_RW, 142 &hammer2_limit_saved_depth, 0, ""); 143 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW, 144 &hammer2_limit_dirty_chains, 0, ""); 145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW, 146 &hammer2_limit_dirty_inodes, 0, ""); 147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RD, 148 &hammer2_count_modified_chains, 0, ""); 149 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD, 150 &hammer2_dio_count, 0, ""); 151 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW, 152 &hammer2_dio_limit, 0, ""); 153 154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RD, 155 &hammer2_iod_file_read, 0, ""); 156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RD, 157 &hammer2_iod_meta_read, 0, ""); 158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RD, 159 &hammer2_iod_indr_read, 0, ""); 160 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RD, 161 &hammer2_iod_fmap_read, 0, ""); 162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RD, 163 &hammer2_iod_volu_read, 0, ""); 164 165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RD, 166 &hammer2_iod_file_write, 0, ""); 167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RD, 168 &hammer2_iod_file_wembed, 0, ""); 169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RD, 170 &hammer2_iod_file_wzero, 0, ""); 171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RD, 172 &hammer2_iod_file_wdedup, 0, ""); 173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RD, 174 &hammer2_iod_meta_write, 0, ""); 175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RD, 176 &hammer2_iod_indr_write, 0, ""); 177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RD, 178 &hammer2_iod_fmap_write, 0, ""); 179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RD, 180 &hammer2_iod_volu_write, 0, ""); 181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_creates, CTLFLAG_RD, 182 &hammer2_iod_inode_creates, 0, ""); 183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_deletes, CTLFLAG_RD, 184 &hammer2_iod_inode_deletes, 0, ""); 185 186 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RD, 187 &hammer2_process_icrc32, 0, ""); 188 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RD, 189 &hammer2_process_xxhash64, 0, ""); 190 191 static int hammer2_vfs_init(struct vfsconf *conf); 192 static int hammer2_vfs_uninit(struct vfsconf *vfsp); 193 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 194 struct ucred *cred); 195 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *, 196 struct ucred *); 197 static int hammer2_recovery(hammer2_dev_t *hmp); 198 static int hammer2_vfs_unmount(struct mount *mp, int mntflags); 199 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp); 200 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, 201 struct ucred *cred); 202 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, 203 struct ucred *cred); 204 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 205 struct fid *fhp, struct vnode **vpp); 206 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp); 207 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 208 int *exflagsp, struct ucred **credanonp); 209 static int hammer2_vfs_modifying(struct mount *mp); 210 211 static void hammer2_update_pmps(hammer2_dev_t *hmp); 212 213 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp); 214 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, 215 hammer2_dev_t *hmp); 216 static int hammer2_fixup_pfses(hammer2_dev_t *hmp); 217 218 /* 219 * HAMMER2 vfs operations. 220 */ 221 static struct vfsops hammer2_vfsops = { 222 .vfs_flags = 0, 223 .vfs_init = hammer2_vfs_init, 224 .vfs_uninit = hammer2_vfs_uninit, 225 .vfs_sync = hammer2_vfs_sync, 226 .vfs_mount = hammer2_vfs_mount, 227 .vfs_unmount = hammer2_vfs_unmount, 228 .vfs_root = hammer2_vfs_root, 229 .vfs_statfs = hammer2_vfs_statfs, 230 .vfs_statvfs = hammer2_vfs_statvfs, 231 .vfs_vget = hammer2_vfs_vget, 232 .vfs_vptofh = hammer2_vfs_vptofh, 233 .vfs_fhtovp = hammer2_vfs_fhtovp, 234 .vfs_checkexp = hammer2_vfs_checkexp, 235 .vfs_modifying = hammer2_vfs_modifying 236 }; 237 238 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", ""); 239 240 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE); 241 MODULE_VERSION(hammer2, 1); 242 243 static 244 int 245 hammer2_vfs_init(struct vfsconf *conf) 246 { 247 static struct objcache_malloc_args margs_read; 248 static struct objcache_malloc_args margs_write; 249 static struct objcache_malloc_args margs_vop; 250 251 int error; 252 int mod; 253 254 error = 0; 255 kmalloc_raise_limit(M_HAMMER2, 0); /* unlimited */ 256 257 /* 258 * hammer2_xop_nthreads must be a multiple of ncpus, 259 * minimum 2 * ncpus. 260 */ 261 mod = ncpus; 262 hammer2_xop_mod = mod; 263 hammer2_xop_nthreads = mod * 2; 264 while (hammer2_xop_nthreads / mod < HAMMER2_XOPGROUPS_MIN || 265 hammer2_xop_nthreads < HAMMER2_XOPTHREADS_MIN) 266 { 267 hammer2_xop_nthreads += mod; 268 } 269 hammer2_xop_sgroups = hammer2_xop_nthreads / mod / 2; 270 hammer2_xop_xgroups = hammer2_xop_nthreads / mod - hammer2_xop_sgroups; 271 hammer2_xop_xbase = hammer2_xop_sgroups * mod; 272 273 /* 274 * A large DIO cache is needed to retain dedup enablement masks. 275 * The bulkfree code clears related masks as part of the disk block 276 * recycling algorithm, preventing it from being used for a later 277 * dedup. 278 * 279 * NOTE: A large buffer cache can actually interfere with dedup 280 * operation because we dedup based on media physical buffers 281 * and not logical buffers. Try to make the DIO case large 282 * enough to avoid this problem, but also cap it. 283 */ 284 hammer2_dio_limit = nbuf * 2; 285 if (hammer2_dio_limit > 100000) 286 hammer2_dio_limit = 100000; 287 288 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref)) 289 error = EINVAL; 290 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data)) 291 error = EINVAL; 292 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data)) 293 error = EINVAL; 294 295 if (error) 296 kprintf("HAMMER2 structure size mismatch; cannot continue.\n"); 297 298 margs_read.objsize = 65536; 299 margs_read.mtype = M_HAMMER2_DEBUFFER; 300 301 margs_write.objsize = 32768; 302 margs_write.mtype = M_HAMMER2_CBUFFER; 303 304 margs_vop.objsize = sizeof(hammer2_xop_t); 305 margs_vop.mtype = M_HAMMER2; 306 307 /* 308 * Note thaht for the XOPS cache we want backing store allocations 309 * to use M_ZERO. This is not allowed in objcache_get() (to avoid 310 * confusion), so use the backing store function that does it. This 311 * means that initial XOPS objects are zerod but REUSED objects are 312 * not. So we are responsible for cleaning the object up sufficiently 313 * for our needs before objcache_put()ing it back (typically just the 314 * FIFO indices). 315 */ 316 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc, 317 0, 1, NULL, NULL, NULL, 318 objcache_malloc_alloc, 319 objcache_malloc_free, 320 &margs_read); 321 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc, 322 0, 1, NULL, NULL, NULL, 323 objcache_malloc_alloc, 324 objcache_malloc_free, 325 &margs_write); 326 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc, 327 0, 1, NULL, NULL, NULL, 328 objcache_malloc_alloc_zero, 329 objcache_malloc_free, 330 &margs_vop); 331 332 333 lockinit(&hammer2_mntlk, "mntlk", 0, 0); 334 TAILQ_INIT(&hammer2_mntlist); 335 TAILQ_INIT(&hammer2_pfslist); 336 TAILQ_INIT(&hammer2_spmplist); 337 338 hammer2_limit_dirty_chains = maxvnodes / 10; 339 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS) 340 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS; 341 if (hammer2_limit_dirty_chains < 1000) 342 hammer2_limit_dirty_chains = 1000; 343 344 hammer2_limit_dirty_inodes = maxvnodes / 25; 345 if (hammer2_limit_dirty_inodes < 100) 346 hammer2_limit_dirty_inodes = 100; 347 if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES) 348 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES; 349 350 hammer2_limit_saved_chains = hammer2_limit_dirty_chains * 5; 351 352 return (error); 353 } 354 355 static 356 int 357 hammer2_vfs_uninit(struct vfsconf *vfsp __unused) 358 { 359 objcache_destroy(cache_buffer_read); 360 objcache_destroy(cache_buffer_write); 361 objcache_destroy(cache_xops); 362 return 0; 363 } 364 365 /* 366 * Core PFS allocator. Used to allocate or reference the pmp structure 367 * for PFS cluster mounts and the spmp structure for media (hmp) structures. 368 * The pmp can be passed in or loaded by this function using the chain and 369 * inode data. 370 * 371 * pmp->modify_tid tracks new modify_tid transaction ids for front-end 372 * transactions. Note that synchronization does not use this field. 373 * (typically frontend operations and synchronization cannot run on the 374 * same PFS node at the same time). 375 * 376 * XXX check locking 377 */ 378 hammer2_pfs_t * 379 hammer2_pfsalloc(hammer2_chain_t *chain, 380 const hammer2_inode_data_t *ripdata, 381 hammer2_dev_t *force_local) 382 { 383 hammer2_pfs_t *pmp; 384 hammer2_inode_t *iroot; 385 int count; 386 int i; 387 int j; 388 389 pmp = NULL; 390 391 /* 392 * Locate or create the PFS based on the cluster id. If ripdata 393 * is NULL this is a spmp which is unique and is always allocated. 394 * 395 * If the device is mounted in local mode all PFSs are considered 396 * independent and not part of any cluster (for debugging only). 397 */ 398 if (ripdata) { 399 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 400 if (force_local != pmp->force_local) 401 continue; 402 if (force_local == NULL && 403 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid, 404 sizeof(pmp->pfs_clid)) == 0) { 405 break; 406 } else if (force_local && pmp->pfs_names[0] && 407 strcmp(pmp->pfs_names[0], (const char *)ripdata->filename) == 0) { 408 break; 409 } 410 } 411 } 412 413 if (pmp == NULL) { 414 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO); 415 pmp->force_local = force_local; 416 hammer2_trans_manage_init(pmp); 417 kmalloc_create_obj(&pmp->minode, "HAMMER2-inodes", 418 sizeof(struct hammer2_inode)); 419 lockinit(&pmp->lock, "pfslk", 0, 0); 420 hammer2_spin_init(&pmp->blockset_spin, "h2blkset"); 421 hammer2_inum_hash_init(pmp); 422 hammer2_spin_init(&pmp->xop_spin, "h2xop"); 423 TAILQ_INIT(&pmp->syncq); 424 TAILQ_INIT(&pmp->depq); 425 hammer2_spin_init(&pmp->list_spin, "h2pfsalloc_list"); 426 427 /* 428 * Save the last media transaction id for the flusher. Set 429 * initial 430 */ 431 if (ripdata) { 432 pmp->pfs_clid = ripdata->meta.pfs_clid; 433 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry); 434 } else { 435 pmp->flags |= HAMMER2_PMPF_SPMP; 436 TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry); 437 } 438 439 /* 440 * The synchronization thread may start too early, make 441 * sure it stays frozen until we are ready to let it go. 442 * XXX 443 */ 444 /* 445 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN | 446 HAMMER2_THREAD_REMASTER; 447 */ 448 } 449 450 /* 451 * Create the PFS's root inode and any missing XOP helper threads. 452 */ 453 if ((iroot = pmp->iroot) == NULL) { 454 iroot = hammer2_inode_get(pmp, NULL, 1, -1); 455 if (ripdata) 456 iroot->meta = ripdata->meta; 457 pmp->iroot = iroot; 458 hammer2_inode_ref(iroot); 459 hammer2_inode_unlock(iroot); 460 } 461 462 /* 463 * Stop here if no chain is passed in. 464 */ 465 if (chain == NULL) 466 goto done; 467 468 /* 469 * When a chain is passed in we must add it to the PFS's root 470 * inode, update pmp->pfs_types[], and update the syncronization 471 * threads. 472 * 473 * When forcing local mode, mark the PFS as a MASTER regardless. 474 * 475 * At the moment empty spots can develop due to removals or failures. 476 * Ultimately we want to re-fill these spots but doing so might 477 * confused running code. XXX 478 */ 479 hammer2_inode_ref(iroot); 480 hammer2_mtx_ex(&iroot->lock); 481 j = iroot->cluster.nchains; 482 483 if (j == HAMMER2_MAXCLUSTER) { 484 kprintf("hammer2_pfsalloc: cluster full!\n"); 485 /* XXX fatal error? */ 486 } else { 487 KKASSERT(chain->pmp == NULL); 488 chain->pmp = pmp; 489 hammer2_chain_ref(chain); 490 iroot->cluster.array[j].chain = chain; 491 if (force_local) 492 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER; 493 else 494 pmp->pfs_types[j] = ripdata->meta.pfs_type; 495 pmp->pfs_names[j] = kstrdup((const char *)ripdata->filename, M_HAMMER2); 496 pmp->pfs_hmps[j] = chain->hmp; 497 hammer2_spin_ex(&pmp->blockset_spin); 498 pmp->pfs_iroot_blocksets[j] = chain->data->ipdata.u.blockset; 499 hammer2_spin_unex(&pmp->blockset_spin); 500 501 /* 502 * If the PFS is already mounted we must account 503 * for the mount_count here. 504 */ 505 if (pmp->mp) 506 ++chain->hmp->mount_count; 507 508 /* 509 * May have to fixup dirty chain tracking. Previous 510 * pmp was NULL so nothing to undo. 511 */ 512 if (chain->flags & HAMMER2_CHAIN_MODIFIED) 513 hammer2_pfs_memory_inc(pmp); 514 ++j; 515 } 516 iroot->cluster.nchains = j; 517 518 /* 519 * Update nmasters from any PFS inode which is part of the cluster. 520 * It is possible that this will result in a value which is too 521 * high. MASTER PFSs are authoritative for pfs_nmasters and will 522 * override this value later on. 523 * 524 * (This informs us of masters that might not currently be 525 * discoverable by this mount). 526 */ 527 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) { 528 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters; 529 } 530 531 /* 532 * Count visible masters. Masters are usually added with 533 * ripdata->meta.pfs_nmasters set to 1. This detects when there 534 * are more (XXX and must update the master inodes). 535 */ 536 count = 0; 537 for (i = 0; i < iroot->cluster.nchains; ++i) { 538 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) 539 ++count; 540 } 541 if (pmp->pfs_nmasters < count) 542 pmp->pfs_nmasters = count; 543 544 /* 545 * Create missing synchronization and support threads. 546 * 547 * Single-node masters (including snapshots) have nothing to 548 * synchronize and do not require this thread. 549 * 550 * Multi-node masters or any number of soft masters, slaves, copy, 551 * or other PFS types need the thread. 552 * 553 * Each thread is responsible for its particular cluster index. 554 * We use independent threads so stalls or mismatches related to 555 * any given target do not affect other targets. 556 */ 557 for (i = 0; i < iroot->cluster.nchains; ++i) { 558 /* 559 * Single-node masters (including snapshots) have nothing 560 * to synchronize and will make direct xops support calls, 561 * thus they do not require this thread. 562 * 563 * Note that there can be thousands of snapshots. We do not 564 * want to create thousands of threads. 565 */ 566 if (pmp->pfs_nmasters <= 1 && 567 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) { 568 continue; 569 } 570 571 /* 572 * Sync support thread 573 */ 574 if (pmp->sync_thrs[i].td == NULL) { 575 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL, 576 "h2nod", i, -1, 577 hammer2_primary_sync_thread); 578 } 579 } 580 581 /* 582 * Create missing Xop threads 583 * 584 * NOTE: We create helper threads for all mounted PFSs or any 585 * PFSs with 2+ nodes (so the sync thread can update them, 586 * even if not mounted). 587 */ 588 if (pmp->mp || iroot->cluster.nchains >= 2) 589 hammer2_xop_helper_create(pmp); 590 591 hammer2_mtx_unlock(&iroot->lock); 592 hammer2_inode_drop(iroot); 593 done: 594 return pmp; 595 } 596 597 /* 598 * Deallocate an element of a probed PFS. If destroying and this is a 599 * MASTER, adjust nmasters. 600 * 601 * This function does not physically destroy the PFS element in its device 602 * under the super-root (see hammer2_ioctl_pfs_delete()). 603 */ 604 void 605 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying) 606 { 607 hammer2_inode_t *iroot; 608 hammer2_chain_t *chain; 609 int j; 610 611 /* 612 * Cleanup our reference on iroot. iroot is (should) not be needed 613 * by the flush code. 614 */ 615 iroot = pmp->iroot; 616 if (iroot) { 617 /* 618 * Stop synchronizing 619 * 620 * XXX flush after acquiring the iroot lock. 621 * XXX clean out the cluster index from all inode structures. 622 */ 623 hammer2_thr_delete(&pmp->sync_thrs[clindex]); 624 625 /* 626 * Remove the cluster index from the group. If destroying 627 * the PFS and this is a master, adjust pfs_nmasters. 628 */ 629 hammer2_mtx_ex(&iroot->lock); 630 chain = iroot->cluster.array[clindex].chain; 631 iroot->cluster.array[clindex].chain = NULL; 632 633 switch(pmp->pfs_types[clindex]) { 634 case HAMMER2_PFSTYPE_MASTER: 635 if (destroying && pmp->pfs_nmasters > 0) 636 --pmp->pfs_nmasters; 637 /* XXX adjust ripdata->meta.pfs_nmasters */ 638 break; 639 default: 640 break; 641 } 642 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE; 643 644 hammer2_mtx_unlock(&iroot->lock); 645 646 /* 647 * Release the chain. 648 */ 649 if (chain) { 650 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 651 hammer2_chain_drop(chain); 652 } 653 654 /* 655 * Terminate all XOP threads for the cluster index. 656 */ 657 if (pmp->xop_groups) { 658 for (j = 0; j < hammer2_xop_nthreads; ++j) { 659 hammer2_thr_delete( 660 &pmp->xop_groups[j].thrs[clindex]); 661 } 662 } 663 } 664 } 665 666 /* 667 * Destroy a PFS, typically only occurs after the last mount on a device 668 * has gone away. 669 */ 670 static void 671 hammer2_pfsfree(hammer2_pfs_t *pmp) 672 { 673 hammer2_inode_t *iroot; 674 hammer2_chain_t *chain; 675 int chains_still_present = 0; 676 int i; 677 int j; 678 679 /* 680 * Cleanup our reference on iroot. iroot is (should) not be needed 681 * by the flush code. 682 */ 683 if (pmp->flags & HAMMER2_PMPF_SPMP) 684 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry); 685 else 686 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry); 687 688 /* 689 * Clean up iroot 690 */ 691 iroot = pmp->iroot; 692 if (iroot) { 693 for (i = 0; i < iroot->cluster.nchains; ++i) { 694 hammer2_thr_delete(&pmp->sync_thrs[i]); 695 if (pmp->xop_groups) { 696 for (j = 0; j < hammer2_xop_nthreads; ++j) 697 hammer2_thr_delete( 698 &pmp->xop_groups[j].thrs[i]); 699 } 700 chain = iroot->cluster.array[i].chain; 701 if (chain && !RB_EMPTY(&chain->core.rbtree)) { 702 kprintf("hammer2: Warning pmp %p still " 703 "has active chains\n", pmp); 704 chains_still_present = 1; 705 } 706 } 707 KASSERT(iroot->refs == 1, 708 ("PMP->IROOT %p REFS WRONG %d", iroot, iroot->refs)); 709 710 /* ref for iroot */ 711 hammer2_inode_drop(iroot); 712 pmp->iroot = NULL; 713 } 714 715 /* 716 * Free remaining pmp resources 717 */ 718 if (chains_still_present) { 719 kprintf("hammer2: cannot free pmp %p, still in use\n", pmp); 720 } else { 721 kmalloc_destroy_obj(&pmp->minode); 722 kfree(pmp, M_HAMMER2); 723 } 724 } 725 726 /* 727 * Remove all references to hmp from the pfs list. Any PFS which becomes 728 * empty is terminated and freed. 729 * 730 * XXX inefficient. 731 */ 732 static void 733 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which) 734 { 735 hammer2_pfs_t *pmp; 736 hammer2_inode_t *iroot; 737 hammer2_chain_t *rchain; 738 int i; 739 int j; 740 struct hammer2_pfslist *wlist; 741 742 if (which == 0) 743 wlist = &hammer2_pfslist; 744 else 745 wlist = &hammer2_spmplist; 746 again: 747 TAILQ_FOREACH(pmp, wlist, mntentry) { 748 if ((iroot = pmp->iroot) == NULL) 749 continue; 750 751 /* 752 * Determine if this PFS is affected. If it is we must 753 * freeze all management threads and lock its iroot. 754 * 755 * Freezing a management thread forces it idle, operations 756 * in-progress will be aborted and it will have to start 757 * over again when unfrozen, or exit if told to exit. 758 */ 759 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 760 if (pmp->pfs_hmps[i] == hmp) 761 break; 762 } 763 if (i == HAMMER2_MAXCLUSTER) 764 continue; 765 766 hammer2_vfs_sync_pmp(pmp, MNT_WAIT); 767 768 /* 769 * Make sure all synchronization threads are locked 770 * down. 771 */ 772 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 773 if (pmp->pfs_hmps[i] == NULL) 774 continue; 775 hammer2_thr_freeze_async(&pmp->sync_thrs[i]); 776 if (pmp->xop_groups) { 777 for (j = 0; j < hammer2_xop_nthreads; ++j) { 778 hammer2_thr_freeze_async( 779 &pmp->xop_groups[j].thrs[i]); 780 } 781 } 782 } 783 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 784 if (pmp->pfs_hmps[i] == NULL) 785 continue; 786 hammer2_thr_freeze(&pmp->sync_thrs[i]); 787 if (pmp->xop_groups) { 788 for (j = 0; j < hammer2_xop_nthreads; ++j) { 789 hammer2_thr_freeze( 790 &pmp->xop_groups[j].thrs[i]); 791 } 792 } 793 } 794 795 /* 796 * Lock the inode and clean out matching chains. 797 * Note that we cannot use hammer2_inode_lock_*() 798 * here because that would attempt to validate the 799 * cluster that we are in the middle of ripping 800 * apart. 801 * 802 * WARNING! We are working directly on the inodes 803 * embedded cluster. 804 */ 805 hammer2_mtx_ex(&iroot->lock); 806 807 /* 808 * Remove the chain from matching elements of the PFS. 809 */ 810 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 811 if (pmp->pfs_hmps[i] != hmp) 812 continue; 813 hammer2_thr_delete(&pmp->sync_thrs[i]); 814 if (pmp->xop_groups) { 815 for (j = 0; j < hammer2_xop_nthreads; ++j) { 816 hammer2_thr_delete( 817 &pmp->xop_groups[j].thrs[i]); 818 } 819 } 820 rchain = iroot->cluster.array[i].chain; 821 iroot->cluster.array[i].chain = NULL; 822 pmp->pfs_types[i] = HAMMER2_PFSTYPE_NONE; 823 if (pmp->pfs_names[i]) { 824 kfree(pmp->pfs_names[i], M_HAMMER2); 825 pmp->pfs_names[i] = NULL; 826 } 827 if (rchain) { 828 hammer2_chain_drop(rchain); 829 /* focus hint */ 830 if (iroot->cluster.focus == rchain) 831 iroot->cluster.focus = NULL; 832 } 833 pmp->pfs_hmps[i] = NULL; 834 } 835 hammer2_mtx_unlock(&iroot->lock); 836 837 /* 838 * Cleanup trailing chains. Gaps may remain. 839 */ 840 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) { 841 if (pmp->pfs_hmps[i]) 842 break; 843 } 844 iroot->cluster.nchains = i + 1; 845 846 /* 847 * If the PMP has no elements remaining we can destroy it. 848 * (this will transition management threads from frozen->exit). 849 */ 850 if (iroot->cluster.nchains == 0) { 851 /* 852 * If this was the hmp's spmp, we need to clean 853 * a little more stuff out. 854 */ 855 if (hmp->spmp == pmp) { 856 hmp->spmp = NULL; 857 hmp->vchain.pmp = NULL; 858 hmp->fchain.pmp = NULL; 859 } 860 861 /* 862 * Free the pmp and restart the loop 863 */ 864 KKASSERT(TAILQ_EMPTY(&pmp->syncq)); 865 KKASSERT(TAILQ_EMPTY(&pmp->depq)); 866 hammer2_pfsfree(pmp); 867 goto again; 868 } 869 870 /* 871 * If elements still remain we need to set the REMASTER 872 * flag and unfreeze it. 873 */ 874 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 875 if (pmp->pfs_hmps[i] == NULL) 876 continue; 877 hammer2_thr_remaster(&pmp->sync_thrs[i]); 878 hammer2_thr_unfreeze(&pmp->sync_thrs[i]); 879 if (pmp->xop_groups) { 880 for (j = 0; j < hammer2_xop_nthreads; ++j) { 881 hammer2_thr_remaster( 882 &pmp->xop_groups[j].thrs[i]); 883 hammer2_thr_unfreeze( 884 &pmp->xop_groups[j].thrs[i]); 885 } 886 } 887 } 888 } 889 } 890 891 /* 892 * Mount or remount HAMMER2 fileystem from physical media 893 * 894 * mountroot 895 * mp mount point structure 896 * path NULL 897 * data <unused> 898 * cred <unused> 899 * 900 * mount 901 * mp mount point structure 902 * path path to mount point 903 * data pointer to argument structure in user space 904 * volume volume path (device@LABEL form) 905 * hflags user mount flags 906 * cred user credentials 907 * 908 * RETURNS: 0 Success 909 * !0 error number 910 */ 911 static 912 int 913 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data, 914 struct ucred *cred) 915 { 916 struct hammer2_mount_info info; 917 hammer2_pfs_t *pmp; 918 hammer2_pfs_t *spmp; 919 hammer2_dev_t *hmp, *hmp_tmp; 920 hammer2_dev_t *force_local; 921 hammer2_key_t key_next; 922 hammer2_key_t key_dummy; 923 hammer2_key_t lhc; 924 hammer2_chain_t *parent; 925 hammer2_chain_t *chain; 926 const hammer2_inode_data_t *ripdata; 927 hammer2_devvp_list_t devvpl; 928 hammer2_devvp_t *e, *e_tmp; 929 struct file *fp; 930 char devstr[MNAMELEN]; 931 size_t size; 932 size_t done; 933 char *label; 934 int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); 935 int error; 936 int i; 937 938 hmp = NULL; 939 pmp = NULL; 940 label = NULL; 941 bzero(&info, sizeof(info)); 942 943 if (path) { 944 /* 945 * Non-root mount or updating a mount 946 */ 947 error = copyin(data, &info, sizeof(info)); 948 if (error) 949 return (error); 950 } 951 952 if (mp->mnt_flag & MNT_UPDATE) { 953 /* 954 * Update mount. Note that pmp->iroot->cluster is 955 * an inode-embedded cluster and thus cannot be 956 * directly locked. 957 * 958 * XXX HAMMER2 needs to implement NFS export via 959 * mountctl. 960 */ 961 hammer2_cluster_t *cluster; 962 963 error = 0; 964 pmp = MPTOPMP(mp); 965 pmp->hflags = info.hflags; 966 cluster = &pmp->iroot->cluster; 967 for (i = 0; i < cluster->nchains; ++i) { 968 if (cluster->array[i].chain == NULL) 969 continue; 970 hmp = cluster->array[i].chain->hmp; 971 error = hammer2_remount(hmp, mp, path, cred); 972 if (error) 973 break; 974 } 975 976 return error; 977 } 978 979 if (path == NULL) { 980 /* 981 * Root mount 982 */ 983 info.cluster_fd = -1; 984 ksnprintf(devstr, sizeof(devstr), "%s", 985 mp->mnt_stat.f_mntfromname); 986 done = strlen(devstr) + 1; 987 kprintf("hammer2_mount: root devstr=\"%s\"\n", devstr); 988 } else { 989 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done); 990 if (error) 991 return (error); 992 kprintf("hammer2_mount: devstr=\"%s\"\n", devstr); 993 } 994 995 /* 996 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA 997 * if no label specified, based on the partition id. Error out if no 998 * label or device (with partition id) is specified. This is strictly 999 * a convenience to match the default label created by newfs_hammer2, 1000 * our preference is that a label always be specified. 1001 * 1002 * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command 1003 * that does not specify a device, as long as some H2 label 1004 * has already been mounted from that device. This makes 1005 * mounting snapshots a lot easier. 1006 */ 1007 label = strchr(devstr, '@'); 1008 if (label && ((label + 1) - devstr) > done) { 1009 kprintf("hammer2_mount: bad label %s/%zd\n", devstr, done); 1010 return (EINVAL); 1011 } 1012 if (label == NULL || label[1] == 0) { 1013 char slice; 1014 1015 if (label == NULL) 1016 label = devstr + strlen(devstr); 1017 else 1018 *label = '\0'; /* clean up trailing @ */ 1019 1020 slice = label[-1]; 1021 switch(slice) { 1022 case 'a': 1023 label = "BOOT"; 1024 break; 1025 case 'd': 1026 label = "ROOT"; 1027 break; 1028 default: 1029 label = "DATA"; 1030 break; 1031 } 1032 } else { 1033 *label = '\0'; 1034 label++; 1035 } 1036 1037 kprintf("hammer2_mount: device=\"%s\" label=\"%s\" rdonly=%d\n", 1038 devstr, label, ronly); 1039 1040 /* 1041 * Initialize all device vnodes. 1042 */ 1043 TAILQ_INIT(&devvpl); 1044 error = hammer2_init_devvp(devstr, path == NULL, &devvpl); 1045 if (error) { 1046 kprintf("hammer2: failed to initialize devvp in %s\n", devstr); 1047 hammer2_cleanup_devvp(&devvpl); 1048 return error; 1049 } 1050 1051 /* 1052 * Determine if the device has already been mounted. After this 1053 * check hmp will be non-NULL if we are doing the second or more 1054 * hammer2 mounts from the same device. 1055 */ 1056 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1057 if (!TAILQ_EMPTY(&devvpl)) { 1058 /* 1059 * Match the device. Due to the way devfs works, 1060 * we may not be able to directly match the vnode pointer, 1061 * so also check to see if the underlying device matches. 1062 */ 1063 TAILQ_FOREACH(hmp_tmp, &hammer2_mntlist, mntentry) { 1064 TAILQ_FOREACH(e_tmp, &hmp_tmp->devvpl, entry) { 1065 int devvp_found = 0; 1066 TAILQ_FOREACH(e, &devvpl, entry) { 1067 KKASSERT(e->devvp); 1068 if (e_tmp->devvp == e->devvp) 1069 devvp_found = 1; 1070 if (e_tmp->devvp->v_rdev && 1071 e_tmp->devvp->v_rdev == e->devvp->v_rdev) 1072 devvp_found = 1; 1073 } 1074 if (!devvp_found) 1075 goto next_hmp; 1076 } 1077 hmp = hmp_tmp; 1078 kprintf("hammer2_mount: hmp=%p matched\n", hmp); 1079 break; 1080 next_hmp: 1081 continue; 1082 } 1083 1084 /* 1085 * If no match this may be a fresh H2 mount, make sure 1086 * the device is not mounted on anything else. 1087 */ 1088 if (hmp == NULL) { 1089 TAILQ_FOREACH(e, &devvpl, entry) { 1090 struct vnode *devvp = e->devvp; 1091 KKASSERT(devvp); 1092 error = vfs_mountedon(devvp); 1093 if (error) { 1094 kprintf("hammer2_mount: %s mounted %d\n", 1095 e->path, error); 1096 hammer2_cleanup_devvp(&devvpl); 1097 lockmgr(&hammer2_mntlk, LK_RELEASE); 1098 return error; 1099 } 1100 } 1101 } 1102 } else { 1103 /* 1104 * Match the label to a pmp already probed. 1105 */ 1106 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) { 1107 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) { 1108 if (pmp->pfs_names[i] && 1109 strcmp(pmp->pfs_names[i], label) == 0) { 1110 hmp = pmp->pfs_hmps[i]; 1111 break; 1112 } 1113 } 1114 if (hmp) 1115 break; 1116 } 1117 if (hmp == NULL) { 1118 kprintf("hammer2_mount: PFS label \"%s\" not found\n", 1119 label); 1120 hammer2_cleanup_devvp(&devvpl); 1121 lockmgr(&hammer2_mntlk, LK_RELEASE); 1122 return ENOENT; 1123 } 1124 } 1125 1126 /* 1127 * Open the device if this isn't a secondary mount and construct 1128 * the H2 device mount (hmp). 1129 */ 1130 if (hmp == NULL) { 1131 hammer2_chain_t *schain; 1132 hammer2_xop_head_t xop; 1133 1134 /* 1135 * Now open the device 1136 */ 1137 KKASSERT(!TAILQ_EMPTY(&devvpl)); 1138 error = hammer2_open_devvp(&devvpl, ronly); 1139 if (error) { 1140 hammer2_close_devvp(&devvpl, ronly); 1141 hammer2_cleanup_devvp(&devvpl); 1142 lockmgr(&hammer2_mntlk, LK_RELEASE); 1143 return error; 1144 } 1145 1146 /* 1147 * Construct volumes and link with device vnodes. 1148 */ 1149 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO); 1150 hmp->devvp = NULL; 1151 error = hammer2_init_volumes(mp, &devvpl, hmp->volumes, 1152 &hmp->voldata, &hmp->volhdrno, 1153 &hmp->devvp); 1154 if (error) { 1155 hammer2_close_devvp(&devvpl, ronly); 1156 hammer2_cleanup_devvp(&devvpl); 1157 lockmgr(&hammer2_mntlk, LK_RELEASE); 1158 kfree(hmp, M_HAMMER2); 1159 return error; 1160 } 1161 if (!hmp->devvp) { 1162 kprintf("hammer2: failed to initialize root volume\n"); 1163 hammer2_unmount_helper(mp, NULL, hmp); 1164 lockmgr(&hammer2_mntlk, LK_RELEASE); 1165 hammer2_vfs_unmount(mp, MNT_FORCE); 1166 return EINVAL; 1167 } 1168 1169 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", devstr); 1170 hmp->ronly = ronly; 1171 hmp->hflags = info.hflags & HMNT2_DEVFLAGS; 1172 kmalloc_create_obj(&hmp->mchain, "HAMMER2-chains", 1173 sizeof(struct hammer2_chain)); 1174 kmalloc_create_obj(&hmp->mio, "HAMMER2-dio", 1175 sizeof(struct hammer2_io)); 1176 kmalloc_create(&hmp->mmsg, "HAMMER2-msg"); 1177 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry); 1178 hammer2_io_hash_init(hmp); 1179 hammer2_spin_init(&hmp->list_spin, "h2mount_list"); 1180 1181 lockinit(&hmp->vollk, "h2vol", 0, 0); 1182 lockinit(&hmp->bulklk, "h2bulk", 0, 0); 1183 lockinit(&hmp->bflock, "h2bflk", 0, 0); 1184 1185 /* 1186 * vchain setup. vchain.data is embedded. 1187 * vchain.refs is initialized and will never drop to 0. 1188 */ 1189 hmp->vchain.hmp = hmp; 1190 hmp->vchain.refs = 1; 1191 hmp->vchain.data = (void *)&hmp->voldata; 1192 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME; 1193 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1194 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid; 1195 hammer2_chain_init(&hmp->vchain); 1196 1197 /* 1198 * fchain setup. fchain.data is embedded. 1199 * fchain.refs is initialized and will never drop to 0. 1200 * 1201 * The data is not used but needs to be initialized to 1202 * pass assertion muster. We use this chain primarily 1203 * as a placeholder for the freemap's top-level radix tree 1204 * so it does not interfere with the volume's topology 1205 * radix tree. 1206 */ 1207 hmp->fchain.hmp = hmp; 1208 hmp->fchain.refs = 1; 1209 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset; 1210 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP; 1211 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX; 1212 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid; 1213 hmp->fchain.bref.methods = 1214 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) | 1215 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 1216 hammer2_chain_init(&hmp->fchain); 1217 1218 /* 1219 * Initialize volume header related fields. 1220 */ 1221 KKASSERT(hmp->voldata.magic == HAMMER2_VOLUME_ID_HBO || 1222 hmp->voldata.magic == HAMMER2_VOLUME_ID_ABO); 1223 hmp->volsync = hmp->voldata; 1224 hmp->free_reserved = hmp->voldata.allocator_size / 20; 1225 /* 1226 * Must use hmp instead of volume header for these two 1227 * in order to handle volume versions transparently. 1228 */ 1229 if (hmp->voldata.version >= HAMMER2_VOL_VERSION_MULTI_VOLUMES) { 1230 hmp->nvolumes = hmp->voldata.nvolumes; 1231 hmp->total_size = hmp->voldata.total_size; 1232 } else { 1233 hmp->nvolumes = 1; 1234 hmp->total_size = hmp->voldata.volu_size; 1235 } 1236 KKASSERT(hmp->nvolumes > 0); 1237 1238 /* 1239 * Move devvpl entries to hmp. 1240 */ 1241 TAILQ_INIT(&hmp->devvpl); 1242 while ((e = TAILQ_FIRST(&devvpl)) != NULL) { 1243 TAILQ_REMOVE(&devvpl, e, entry); 1244 TAILQ_INSERT_TAIL(&hmp->devvpl, e, entry); 1245 } 1246 KKASSERT(TAILQ_EMPTY(&devvpl)); 1247 KKASSERT(!TAILQ_EMPTY(&hmp->devvpl)); 1248 1249 /* 1250 * Really important to get these right or the flush and 1251 * teardown code will get confused. 1252 */ 1253 hmp->spmp = hammer2_pfsalloc(NULL, NULL, NULL); 1254 spmp = hmp->spmp; 1255 spmp->pfs_hmps[0] = hmp; 1256 1257 /* 1258 * Dummy-up vchain and fchain's modify_tid. mirror_tid 1259 * is inherited from the volume header. 1260 */ 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 = &schain->data->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 = hammer2_inode_get(spmp, &xop, -1, -1); 1325 spmp->spmp_hmp = hmp; 1326 spmp->pfs_types[0] = ripdata->meta.pfs_type; 1327 spmp->pfs_hmps[0] = hmp; 1328 hammer2_inode_ref(spmp->iroot); 1329 hammer2_inode_unlock(spmp->iroot); 1330 hammer2_cluster_unlock(&xop.cluster); 1331 hammer2_chain_drop(schain); 1332 /* do not call hammer2_cluster_drop() on an embedded cluster */ 1333 schain = NULL; /* now invalid */ 1334 /* leave spmp->iroot with one ref */ 1335 1336 if (!hmp->ronly) { 1337 error = hammer2_recovery(hmp); 1338 if (error == 0) 1339 error |= hammer2_fixup_pfses(hmp); 1340 /* XXX do something with error */ 1341 } 1342 hammer2_update_pmps(hmp); 1343 hammer2_iocom_init(hmp); 1344 hammer2_bulkfree_init(hmp); 1345 1346 /* 1347 * Ref the cluster management messaging descriptor. The mount 1348 * program deals with the other end of the communications pipe. 1349 * 1350 * Root mounts typically do not supply one. 1351 */ 1352 if (info.cluster_fd >= 0) { 1353 fp = holdfp(curthread, info.cluster_fd, -1); 1354 if (fp) { 1355 hammer2_cluster_reconnect(hmp, fp); 1356 } else { 1357 kprintf("hammer2_mount: bad cluster_fd!\n"); 1358 } 1359 } 1360 } else { 1361 /* hmp->devvp_list is already constructed. */ 1362 hammer2_cleanup_devvp(&devvpl); 1363 spmp = hmp->spmp; 1364 if (info.hflags & HMNT2_DEVFLAGS) { 1365 kprintf("hammer2_mount: Warning: mount flags pertaining " 1366 "to the whole device may only be specified " 1367 "on the first mount of the device: %08x\n", 1368 info.hflags & HMNT2_DEVFLAGS); 1369 } 1370 } 1371 1372 /* 1373 * Force local mount (disassociate all PFSs from their clusters). 1374 * Used primarily for debugging. 1375 */ 1376 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1377 1378 /* 1379 * Lookup the mount point under the media-localized super-root. 1380 * Scanning hammer2_pfslist doesn't help us because it represents 1381 * PFS cluster ids which can aggregate several named PFSs together. 1382 * 1383 * cluster->pmp will incorrectly point to spmp and must be fixed 1384 * up later on. 1385 */ 1386 hammer2_inode_lock(spmp->iroot, 0); 1387 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1388 lhc = hammer2_dirhash(label, strlen(label)); 1389 chain = hammer2_chain_lookup(&parent, &key_next, 1390 lhc, lhc + HAMMER2_DIRHASH_LOMASK, 1391 &error, 0); 1392 while (chain) { 1393 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && 1394 strcmp(label, (char *)chain->data->ipdata.filename) == 0) { 1395 break; 1396 } 1397 chain = hammer2_chain_next(&parent, chain, &key_next, 1398 key_next, 1399 lhc + HAMMER2_DIRHASH_LOMASK, 1400 &error, 0); 1401 } 1402 if (parent) { 1403 hammer2_chain_unlock(parent); 1404 hammer2_chain_drop(parent); 1405 } 1406 hammer2_inode_unlock(spmp->iroot); 1407 1408 /* 1409 * PFS could not be found? 1410 */ 1411 if (chain == NULL) { 1412 hammer2_unmount_helper(mp, NULL, hmp); 1413 lockmgr(&hammer2_mntlk, LK_RELEASE); 1414 hammer2_vfs_unmount(mp, MNT_FORCE); 1415 1416 if (error) { 1417 kprintf("hammer2_mount: PFS label I/O error\n"); 1418 return EINVAL; 1419 } else { 1420 kprintf("hammer2_mount: PFS label \"%s\" not found\n", 1421 label); 1422 return ENOENT; 1423 } 1424 } 1425 1426 /* 1427 * Acquire the pmp structure (it should have already been allocated 1428 * via hammer2_update_pmps()). 1429 */ 1430 if (chain->error) { 1431 kprintf("hammer2_mount: PFS label I/O error\n"); 1432 } else { 1433 ripdata = &chain->data->ipdata; 1434 pmp = hammer2_pfsalloc(NULL, ripdata, force_local); 1435 } 1436 hammer2_chain_unlock(chain); 1437 hammer2_chain_drop(chain); 1438 1439 /* 1440 * PFS to mount must exist at this point. 1441 */ 1442 if (pmp == NULL) { 1443 kprintf("hammer2_mount: Failed to acquire PFS structure\n"); 1444 hammer2_unmount_helper(mp, NULL, hmp); 1445 lockmgr(&hammer2_mntlk, LK_RELEASE); 1446 hammer2_vfs_unmount(mp, MNT_FORCE); 1447 return EINVAL; 1448 } 1449 1450 /* 1451 * Finish the mount 1452 */ 1453 kprintf("hammer2_mount: hmp=%p pmp=%p\n", hmp, pmp); 1454 1455 /* Check if the pmp has already been mounted. */ 1456 if (pmp->mp) { 1457 kprintf("hammer2_mount: PFS already mounted!\n"); 1458 hammer2_unmount_helper(mp, NULL, hmp); 1459 lockmgr(&hammer2_mntlk, LK_RELEASE); 1460 hammer2_vfs_unmount(mp, MNT_FORCE); 1461 return EBUSY; 1462 } 1463 1464 pmp->hflags = info.hflags; 1465 mp->mnt_flag |= MNT_LOCAL; 1466 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */ 1467 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1468 1469 /* 1470 * required mount structure initializations 1471 */ 1472 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE; 1473 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE; 1474 1475 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE; 1476 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE; 1477 1478 /* 1479 * Optional fields 1480 */ 1481 mp->mnt_iosize_max = MAXPHYS; 1482 1483 /* 1484 * Connect up mount pointers. 1485 */ 1486 hammer2_mount_helper(mp, pmp); 1487 lockmgr(&hammer2_mntlk, LK_RELEASE); 1488 1489 /* 1490 * Finish setup 1491 */ 1492 vfs_getnewfsid(mp); 1493 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops); 1494 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops); 1495 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops); 1496 1497 if (path) { 1498 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, 1499 MNAMELEN - 1, &size); 1500 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 1501 } /* else root mount, already in there */ 1502 1503 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname)); 1504 if (path) { 1505 copyinstr(path, mp->mnt_stat.f_mntonname, 1506 sizeof(mp->mnt_stat.f_mntonname) - 1, 1507 &size); 1508 } else { 1509 /* root mount */ 1510 mp->mnt_stat.f_mntonname[0] = '/'; 1511 } 1512 1513 /* 1514 * Initial statfs to prime mnt_stat. 1515 */ 1516 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred); 1517 1518 return 0; 1519 } 1520 1521 /* 1522 * Scan PFSs under the super-root and create hammer2_pfs structures. 1523 */ 1524 static 1525 void 1526 hammer2_update_pmps(hammer2_dev_t *hmp) 1527 { 1528 const hammer2_inode_data_t *ripdata; 1529 hammer2_chain_t *parent; 1530 hammer2_chain_t *chain; 1531 hammer2_dev_t *force_local; 1532 hammer2_pfs_t *spmp; 1533 hammer2_key_t key_next; 1534 int error; 1535 1536 /* 1537 * Force local mount (disassociate all PFSs from their clusters). 1538 * Used primarily for debugging. 1539 */ 1540 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL; 1541 1542 /* 1543 * Lookup mount point under the media-localized super-root. 1544 * 1545 * cluster->pmp will incorrectly point to spmp and must be fixed 1546 * up later on. 1547 */ 1548 spmp = hmp->spmp; 1549 hammer2_inode_lock(spmp->iroot, 0); 1550 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 1551 chain = hammer2_chain_lookup(&parent, &key_next, 1552 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 1553 &error, 0); 1554 while (chain) { 1555 if (chain->error) { 1556 kprintf("I/O error scanning PFS labels\n"); 1557 } else if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) { 1558 kprintf("Non inode chain type %d under super-root\n", 1559 chain->bref.type); 1560 } else { 1561 ripdata = &chain->data->ipdata; 1562 hammer2_pfsalloc(chain, ripdata, force_local); 1563 } 1564 chain = hammer2_chain_next(&parent, chain, &key_next, 1565 key_next, HAMMER2_KEY_MAX, 1566 &error, 0); 1567 } 1568 if (parent) { 1569 hammer2_chain_unlock(parent); 1570 hammer2_chain_drop(parent); 1571 } 1572 hammer2_inode_unlock(spmp->iroot); 1573 } 1574 1575 static 1576 int 1577 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused, 1578 struct ucred *cred) 1579 { 1580 hammer2_volume_t *vol; 1581 struct vnode *devvp; 1582 int i, error, result = 0; 1583 1584 if (!(hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))) 1585 return 0; 1586 1587 for (i = 0; i < hmp->nvolumes; ++i) { 1588 vol = &hmp->volumes[i]; 1589 devvp = vol->dev->devvp; 1590 KKASSERT(devvp); 1591 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1592 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL); 1593 vn_unlock(devvp); 1594 error = 0; 1595 if (vol->id == HAMMER2_ROOT_VOLUME) { 1596 error = hammer2_recovery(hmp); 1597 if (error == 0) 1598 error |= hammer2_fixup_pfses(hmp); 1599 } 1600 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 1601 if (error == 0) { 1602 VOP_CLOSE(devvp, FREAD, NULL); 1603 } else { 1604 VOP_CLOSE(devvp, FREAD | FWRITE, NULL); 1605 } 1606 vn_unlock(devvp); 1607 result |= error; 1608 } 1609 if (result == 0) { 1610 kprintf("hammer2: enable read/write\n"); 1611 hmp->ronly = 0; 1612 } 1613 1614 return result; 1615 } 1616 1617 static 1618 int 1619 hammer2_vfs_unmount(struct mount *mp, int mntflags) 1620 { 1621 hammer2_pfs_t *pmp; 1622 int flags; 1623 int error = 0; 1624 1625 pmp = MPTOPMP(mp); 1626 1627 if (pmp == NULL) 1628 return(0); 1629 1630 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE); 1631 1632 /* 1633 * If mount initialization proceeded far enough we must flush 1634 * its vnodes and sync the underlying mount points. Three syncs 1635 * are required to fully flush the filesystem (freemap updates lag 1636 * by one flush, and one extra for safety). 1637 */ 1638 if (mntflags & MNT_FORCE) 1639 flags = FORCECLOSE; 1640 else 1641 flags = 0; 1642 if (pmp->iroot) { 1643 error = vflush(mp, 0, flags); 1644 if (error) 1645 goto failed; 1646 hammer2_vfs_sync(mp, MNT_WAIT); 1647 hammer2_vfs_sync(mp, MNT_WAIT); 1648 hammer2_vfs_sync(mp, MNT_WAIT); 1649 } 1650 1651 /* 1652 * Cleanup the frontend support XOPS threads 1653 */ 1654 hammer2_xop_helper_cleanup(pmp); 1655 1656 if (pmp->mp) 1657 hammer2_unmount_helper(mp, pmp, NULL); 1658 1659 error = 0; 1660 failed: 1661 lockmgr(&hammer2_mntlk, LK_RELEASE); 1662 1663 return (error); 1664 } 1665 1666 /* 1667 * Mount helper, hook the system mount into our PFS. 1668 * The mount lock is held. 1669 * 1670 * We must bump the mount_count on related devices for any 1671 * mounted PFSs. 1672 */ 1673 static 1674 void 1675 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp) 1676 { 1677 hammer2_cluster_t *cluster; 1678 hammer2_chain_t *rchain; 1679 int i; 1680 1681 mp->mnt_data = (qaddr_t)pmp; 1682 pmp->mp = mp; 1683 1684 /* 1685 * After pmp->mp is set we have to adjust hmp->mount_count. 1686 */ 1687 cluster = &pmp->iroot->cluster; 1688 for (i = 0; i < cluster->nchains; ++i) { 1689 rchain = cluster->array[i].chain; 1690 if (rchain == NULL) 1691 continue; 1692 ++rchain->hmp->mount_count; 1693 } 1694 1695 /* 1696 * Create missing Xop threads 1697 */ 1698 hammer2_xop_helper_create(pmp); 1699 } 1700 1701 /* 1702 * Unmount helper, unhook the system mount from our PFS. 1703 * The mount lock is held. 1704 * 1705 * If hmp is supplied a mount responsible for being the first to open 1706 * the block device failed and the block device and all PFSs using the 1707 * block device must be cleaned up. 1708 * 1709 * If pmp is supplied multiple devices might be backing the PFS and each 1710 * must be disconnected. This might not be the last PFS using some of the 1711 * underlying devices. Also, we have to adjust our hmp->mount_count 1712 * accounting for the devices backing the pmp which is now undergoing an 1713 * unmount. 1714 */ 1715 static 1716 void 1717 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp) 1718 { 1719 hammer2_cluster_t *cluster; 1720 hammer2_chain_t *rchain; 1721 int dumpcnt; 1722 int i; 1723 1724 /* 1725 * If no device supplied this is a high-level unmount and we have to 1726 * to disconnect the mount, adjust mount_count, and locate devices 1727 * that might now have no mounts. 1728 */ 1729 if (pmp) { 1730 KKASSERT(hmp == NULL); 1731 KKASSERT(MPTOPMP(mp) == pmp); 1732 pmp->mp = NULL; 1733 mp->mnt_data = NULL; 1734 1735 /* 1736 * After pmp->mp is cleared we have to account for 1737 * mount_count. 1738 */ 1739 cluster = &pmp->iroot->cluster; 1740 for (i = 0; i < cluster->nchains; ++i) { 1741 rchain = cluster->array[i].chain; 1742 if (rchain == NULL) 1743 continue; 1744 --rchain->hmp->mount_count; 1745 /* scrapping hmp now may invalidate the pmp */ 1746 } 1747 again: 1748 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) { 1749 if (hmp->mount_count == 0) { 1750 hammer2_unmount_helper(NULL, NULL, hmp); 1751 goto again; 1752 } 1753 } 1754 return; 1755 } 1756 1757 /* 1758 * Try to terminate the block device. We can't terminate it if 1759 * there are still PFSs referencing it. 1760 */ 1761 if (hmp->mount_count) 1762 return; 1763 1764 /* 1765 * Decomission the network before we start messing with the 1766 * device and PFS. 1767 */ 1768 hammer2_iocom_uninit(hmp); 1769 1770 hammer2_bulkfree_uninit(hmp); 1771 hammer2_pfsfree_scan(hmp, 0); 1772 1773 /* 1774 * Cycle the volume data lock as a safety (probably not needed any 1775 * more). To ensure everything is out we need to flush at least 1776 * three times. (1) The running of the sideq can dirty the 1777 * filesystem, (2) A normal flush can dirty the freemap, and 1778 * (3) ensure that the freemap is fully synchronized. 1779 * 1780 * The next mount's recovery scan can clean everything up but we want 1781 * to leave the filesystem in a 100% clean state on a normal unmount. 1782 */ 1783 #if 0 1784 hammer2_voldata_lock(hmp); 1785 hammer2_voldata_unlock(hmp); 1786 #endif 1787 1788 /* 1789 * Flush whatever is left. Unmounted but modified PFS's might still 1790 * have some dirty chains on them. 1791 */ 1792 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS); 1793 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS); 1794 1795 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1796 hammer2_voldata_modify(hmp); 1797 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP | 1798 HAMMER2_FLUSH_ALL); 1799 } 1800 hammer2_chain_unlock(&hmp->fchain); 1801 1802 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) { 1803 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP | 1804 HAMMER2_FLUSH_ALL); 1805 } 1806 hammer2_chain_unlock(&hmp->vchain); 1807 1808 if ((hmp->vchain.flags | hmp->fchain.flags) & 1809 HAMMER2_CHAIN_FLUSH_MASK) { 1810 kprintf("hammer2_unmount: chains left over after final sync\n"); 1811 kprintf(" vchain %08x\n", hmp->vchain.flags); 1812 kprintf(" fchain %08x\n", hmp->fchain.flags); 1813 1814 if (hammer2_debug & 0x0010) 1815 Debugger("entered debugger"); 1816 } 1817 1818 hammer2_pfsfree_scan(hmp, 1); 1819 1820 KKASSERT(hmp->spmp == NULL); 1821 1822 /* 1823 * Finish up with the device vnode 1824 */ 1825 if (!TAILQ_EMPTY(&hmp->devvpl)) { 1826 hammer2_close_devvp(&hmp->devvpl, hmp->ronly); 1827 hammer2_cleanup_devvp(&hmp->devvpl); 1828 } 1829 KKASSERT(TAILQ_EMPTY(&hmp->devvpl)); 1830 1831 /* 1832 * Clear vchain/fchain flags that might prevent final cleanup 1833 * of these chains. 1834 */ 1835 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) { 1836 atomic_add_long(&hammer2_count_modified_chains, -1); 1837 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 1838 hammer2_pfs_memory_wakeup(hmp->vchain.pmp, -1); 1839 } 1840 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) { 1841 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE); 1842 } 1843 1844 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) { 1845 atomic_add_long(&hammer2_count_modified_chains, -1); 1846 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED); 1847 hammer2_pfs_memory_wakeup(hmp->fchain.pmp, -1); 1848 } 1849 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) { 1850 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE); 1851 } 1852 1853 dumpcnt = 50; 1854 hammer2_dump_chain(&hmp->vchain, 0, 0, &dumpcnt, 'v', (u_int)-1); 1855 dumpcnt = 50; 1856 hammer2_dump_chain(&hmp->fchain, 0, 0, &dumpcnt, 'f', (u_int)-1); 1857 1858 /* 1859 * Final drop of embedded freemap root chain to 1860 * clean up fchain.core (fchain structure is not 1861 * flagged ALLOCATED so it is cleaned out and then 1862 * left to rot). 1863 */ 1864 hammer2_chain_drop(&hmp->fchain); 1865 1866 /* 1867 * Final drop of embedded volume root chain to clean 1868 * up vchain.core (vchain structure is not flagged 1869 * ALLOCATED so it is cleaned out and then left to 1870 * rot). 1871 */ 1872 hammer2_chain_drop(&hmp->vchain); 1873 1874 hammer2_io_hash_cleanup_all(hmp); 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_obj(&hmp->mchain); 1882 kmalloc_destroy_obj(&hmp->mio); 1883 kmalloc_destroy(&hmp->mmsg); 1884 kfree(hmp, M_HAMMER2); 1885 } 1886 1887 int 1888 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp, 1889 ino_t ino, struct vnode **vpp) 1890 { 1891 hammer2_xop_lookup_t *xop; 1892 hammer2_pfs_t *pmp; 1893 hammer2_inode_t *ip; 1894 hammer2_tid_t inum; 1895 int error; 1896 1897 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK; 1898 1899 error = 0; 1900 pmp = MPTOPMP(mp); 1901 1902 /* 1903 * Easy if we already have it cached 1904 */ 1905 ip = hammer2_inode_lookup(pmp, inum); 1906 if (ip) { 1907 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED); 1908 *vpp = hammer2_igetv(ip, &error); 1909 hammer2_inode_unlock(ip); 1910 hammer2_inode_drop(ip); /* from lookup */ 1911 1912 return error; 1913 } 1914 1915 /* 1916 * Otherwise we have to find the inode 1917 */ 1918 xop = hammer2_xop_alloc(pmp->iroot, 0); 1919 xop->lhc = inum; 1920 hammer2_xop_start(&xop->head, &hammer2_lookup_desc); 1921 error = hammer2_xop_collect(&xop->head, 0); 1922 1923 if (error == 0) 1924 ip = hammer2_inode_get(pmp, &xop->head, -1, -1); 1925 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1926 1927 if (ip) { 1928 *vpp = hammer2_igetv(ip, &error); 1929 hammer2_inode_unlock(ip); 1930 } else { 1931 *vpp = NULL; 1932 error = ENOENT; 1933 } 1934 return (error); 1935 } 1936 1937 static 1938 int 1939 hammer2_vfs_root(struct mount *mp, struct vnode **vpp) 1940 { 1941 hammer2_pfs_t *pmp; 1942 struct vnode *vp; 1943 int error; 1944 1945 pmp = MPTOPMP(mp); 1946 if (pmp->iroot == NULL) { 1947 kprintf("hammer2 (%s): no root inode\n", 1948 mp->mnt_stat.f_mntfromname); 1949 *vpp = NULL; 1950 return EINVAL; 1951 } 1952 1953 error = 0; 1954 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1955 1956 while (pmp->inode_tid == 0) { 1957 hammer2_xop_ipcluster_t *xop; 1958 const hammer2_inode_meta_t *meta; 1959 1960 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING); 1961 hammer2_xop_start(&xop->head, &hammer2_ipcluster_desc); 1962 error = hammer2_xop_collect(&xop->head, 0); 1963 1964 if (error == 0) { 1965 meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta; 1966 pmp->iroot->meta = *meta; 1967 pmp->inode_tid = meta->pfs_inum + 1; 1968 hammer2_xop_pdata(&xop->head); 1969 /* meta invalid */ 1970 1971 if (pmp->inode_tid < HAMMER2_INODE_START) 1972 pmp->inode_tid = HAMMER2_INODE_START; 1973 pmp->modify_tid = 1974 xop->head.cluster.focus->bref.modify_tid + 1; 1975 #if 0 1976 kprintf("PFS: Starting inode %jd\n", 1977 (intmax_t)pmp->inode_tid); 1978 kprintf("PMP focus good set nextino=%ld mod=%016jx\n", 1979 pmp->inode_tid, pmp->modify_tid); 1980 #endif 1981 wakeup(&pmp->iroot); 1982 1983 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1984 1985 /* 1986 * Prime the mount info. 1987 */ 1988 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL); 1989 break; 1990 } 1991 1992 /* 1993 * Loop, try again 1994 */ 1995 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP); 1996 hammer2_inode_unlock(pmp->iroot); 1997 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz); 1998 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED); 1999 if (error == EINTR) 2000 break; 2001 } 2002 2003 if (error) { 2004 hammer2_inode_unlock(pmp->iroot); 2005 *vpp = NULL; 2006 } else { 2007 vp = hammer2_igetv(pmp->iroot, &error); 2008 hammer2_inode_unlock(pmp->iroot); 2009 *vpp = vp; 2010 } 2011 2012 return (error); 2013 } 2014 2015 /* 2016 * Filesystem status 2017 * 2018 * XXX incorporate ipdata->meta.inode_quota and data_quota 2019 */ 2020 static 2021 int 2022 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 2023 { 2024 hammer2_pfs_t *pmp; 2025 hammer2_dev_t *hmp; 2026 hammer2_blockref_t bref; 2027 struct statfs tmp; 2028 int i; 2029 2030 /* 2031 * NOTE: iroot might not have validated the cluster yet. 2032 */ 2033 pmp = MPTOPMP(mp); 2034 2035 bzero(&tmp, sizeof(tmp)); 2036 2037 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2038 hmp = pmp->pfs_hmps[i]; 2039 if (hmp == NULL) 2040 continue; 2041 if (pmp->iroot->cluster.array[i].chain) 2042 bref = pmp->iroot->cluster.array[i].chain->bref; 2043 else 2044 bzero(&bref, sizeof(bref)); 2045 2046 tmp.f_files = bref.embed.stats.inode_count; 2047 tmp.f_ffree = 0; 2048 tmp.f_blocks = hmp->voldata.allocator_size / 2049 mp->mnt_vstat.f_bsize; 2050 tmp.f_bfree = hmp->voldata.allocator_free / 2051 mp->mnt_vstat.f_bsize; 2052 tmp.f_bavail = tmp.f_bfree; 2053 2054 if (cred && cred->cr_uid != 0) { 2055 uint64_t adj; 2056 2057 /* 5% */ 2058 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2059 tmp.f_blocks -= adj; 2060 tmp.f_bfree -= adj; 2061 tmp.f_bavail -= adj; 2062 } 2063 2064 mp->mnt_stat.f_blocks = tmp.f_blocks; 2065 mp->mnt_stat.f_bfree = tmp.f_bfree; 2066 mp->mnt_stat.f_bavail = tmp.f_bavail; 2067 mp->mnt_stat.f_files = tmp.f_files; 2068 mp->mnt_stat.f_ffree = tmp.f_ffree; 2069 2070 *sbp = mp->mnt_stat; 2071 } 2072 return (0); 2073 } 2074 2075 static 2076 int 2077 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 2078 { 2079 hammer2_pfs_t *pmp; 2080 hammer2_dev_t *hmp; 2081 hammer2_blockref_t bref; 2082 struct statvfs tmp; 2083 int i; 2084 2085 /* 2086 * NOTE: iroot might not have validated the cluster yet. 2087 */ 2088 pmp = MPTOPMP(mp); 2089 bzero(&tmp, sizeof(tmp)); 2090 2091 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 2092 hmp = pmp->pfs_hmps[i]; 2093 if (hmp == NULL) 2094 continue; 2095 if (pmp->iroot->cluster.array[i].chain) 2096 bref = pmp->iroot->cluster.array[i].chain->bref; 2097 else 2098 bzero(&bref, sizeof(bref)); 2099 2100 tmp.f_files = bref.embed.stats.inode_count; 2101 tmp.f_ffree = 0; 2102 tmp.f_blocks = hmp->voldata.allocator_size / 2103 mp->mnt_vstat.f_bsize; 2104 tmp.f_bfree = hmp->voldata.allocator_free / 2105 mp->mnt_vstat.f_bsize; 2106 tmp.f_bavail = tmp.f_bfree; 2107 2108 if (cred && cred->cr_uid != 0) { 2109 uint64_t adj; 2110 2111 /* 5% */ 2112 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize; 2113 tmp.f_blocks -= adj; 2114 tmp.f_bfree -= adj; 2115 tmp.f_bavail -= adj; 2116 } 2117 2118 mp->mnt_vstat.f_blocks = tmp.f_blocks; 2119 mp->mnt_vstat.f_bfree = tmp.f_bfree; 2120 mp->mnt_vstat.f_bavail = tmp.f_bavail; 2121 mp->mnt_vstat.f_files = tmp.f_files; 2122 mp->mnt_vstat.f_ffree = tmp.f_ffree; 2123 2124 *sbp = mp->mnt_vstat; 2125 } 2126 return (0); 2127 } 2128 2129 /* 2130 * Mount-time recovery (RW mounts) 2131 * 2132 * Updates to the free block table are allowed to lag flushes by one 2133 * transaction. In case of a crash, then on a fresh mount we must do an 2134 * incremental scan of the last committed transaction id and make sure that 2135 * all related blocks have been marked allocated. 2136 */ 2137 struct hammer2_recovery_elm { 2138 TAILQ_ENTRY(hammer2_recovery_elm) entry; 2139 hammer2_chain_t *chain; 2140 hammer2_tid_t sync_tid; 2141 }; 2142 2143 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm); 2144 2145 struct hammer2_recovery_info { 2146 struct hammer2_recovery_list list; 2147 hammer2_tid_t mtid; 2148 int depth; 2149 }; 2150 2151 static int hammer2_recovery_scan(hammer2_dev_t *hmp, 2152 hammer2_chain_t *parent, 2153 struct hammer2_recovery_info *info, 2154 hammer2_tid_t sync_tid); 2155 2156 #define HAMMER2_RECOVERY_MAXDEPTH 10 2157 2158 static 2159 int 2160 hammer2_recovery(hammer2_dev_t *hmp) 2161 { 2162 struct hammer2_recovery_info info; 2163 struct hammer2_recovery_elm *elm; 2164 hammer2_chain_t *parent; 2165 hammer2_tid_t sync_tid; 2166 hammer2_tid_t mirror_tid; 2167 int error; 2168 2169 hammer2_trans_init(hmp->spmp, 0); 2170 2171 sync_tid = hmp->voldata.freemap_tid; 2172 mirror_tid = hmp->voldata.mirror_tid; 2173 2174 kprintf("hammer2_mount: \"%s\": ", hmp->devrepname); 2175 if (sync_tid >= mirror_tid) { 2176 kprintf("no recovery needed\n"); 2177 } else { 2178 kprintf("freemap recovery %016jx-%016jx\n", 2179 sync_tid + 1, mirror_tid); 2180 } 2181 2182 TAILQ_INIT(&info.list); 2183 info.depth = 0; 2184 parent = hammer2_chain_lookup_init(&hmp->vchain, 0); 2185 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid); 2186 hammer2_chain_lookup_done(parent); 2187 2188 while ((elm = TAILQ_FIRST(&info.list)) != NULL) { 2189 TAILQ_REMOVE(&info.list, elm, entry); 2190 parent = elm->chain; 2191 sync_tid = elm->sync_tid; 2192 kfree(elm, M_HAMMER2); 2193 2194 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2195 error |= hammer2_recovery_scan(hmp, parent, &info, 2196 hmp->voldata.freemap_tid); 2197 hammer2_chain_unlock(parent); 2198 hammer2_chain_drop(parent); /* drop elm->chain ref */ 2199 } 2200 2201 hammer2_trans_done(hmp->spmp, 0); 2202 2203 return error; 2204 } 2205 2206 static 2207 int 2208 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent, 2209 struct hammer2_recovery_info *info, 2210 hammer2_tid_t sync_tid) 2211 { 2212 const hammer2_inode_data_t *ripdata; 2213 hammer2_chain_t *chain; 2214 hammer2_blockref_t bref; 2215 int tmp_error; 2216 int rup_error; 2217 int error; 2218 int first; 2219 2220 /* 2221 * Adjust freemap to ensure that the block(s) are marked allocated. 2222 */ 2223 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) { 2224 hammer2_freemap_adjust(hmp, &parent->bref, 2225 HAMMER2_FREEMAP_DORECOVER); 2226 } 2227 2228 /* 2229 * Check type for recursive scan 2230 */ 2231 switch(parent->bref.type) { 2232 case HAMMER2_BREF_TYPE_VOLUME: 2233 /* data already instantiated */ 2234 break; 2235 case HAMMER2_BREF_TYPE_INODE: 2236 /* 2237 * Must instantiate data for DIRECTDATA test and also 2238 * for recursion. 2239 */ 2240 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2241 ripdata = &parent->data->ipdata; 2242 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) { 2243 /* not applicable to recovery scan */ 2244 hammer2_chain_unlock(parent); 2245 return 0; 2246 } 2247 hammer2_chain_unlock(parent); 2248 break; 2249 case HAMMER2_BREF_TYPE_INDIRECT: 2250 /* 2251 * Must instantiate data for recursion 2252 */ 2253 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS); 2254 hammer2_chain_unlock(parent); 2255 break; 2256 case HAMMER2_BREF_TYPE_DIRENT: 2257 case HAMMER2_BREF_TYPE_DATA: 2258 case HAMMER2_BREF_TYPE_FREEMAP: 2259 case HAMMER2_BREF_TYPE_FREEMAP_NODE: 2260 case HAMMER2_BREF_TYPE_FREEMAP_LEAF: 2261 /* not applicable to recovery scan */ 2262 return 0; 2263 break; 2264 default: 2265 return HAMMER2_ERROR_BADBREF; 2266 } 2267 2268 /* 2269 * Defer operation if depth limit reached. 2270 */ 2271 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) { 2272 struct hammer2_recovery_elm *elm; 2273 2274 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK); 2275 elm->chain = parent; 2276 elm->sync_tid = sync_tid; 2277 hammer2_chain_ref(parent); 2278 TAILQ_INSERT_TAIL(&info->list, elm, entry); 2279 /* unlocked by caller */ 2280 2281 return(0); 2282 } 2283 2284 2285 /* 2286 * Recursive scan of the last flushed transaction only. We are 2287 * doing this without pmp assignments so don't leave the chains 2288 * hanging around after we are done with them. 2289 * 2290 * error Cumulative error this level only 2291 * rup_error Cumulative error for recursion 2292 * tmp_error Specific non-cumulative recursion error 2293 */ 2294 chain = NULL; 2295 first = 1; 2296 rup_error = 0; 2297 error = 0; 2298 2299 for (;;) { 2300 error |= hammer2_chain_scan(parent, &chain, &bref, 2301 &first, 2302 HAMMER2_LOOKUP_NODATA); 2303 2304 /* 2305 * Problem during scan or EOF 2306 */ 2307 if (error) 2308 break; 2309 2310 /* 2311 * If this is a leaf 2312 */ 2313 if (chain == NULL) { 2314 if (bref.mirror_tid > sync_tid) { 2315 hammer2_freemap_adjust(hmp, &bref, 2316 HAMMER2_FREEMAP_DORECOVER); 2317 } 2318 continue; 2319 } 2320 2321 /* 2322 * This may or may not be a recursive node. 2323 */ 2324 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE); 2325 if (bref.mirror_tid > sync_tid) { 2326 ++info->depth; 2327 tmp_error = hammer2_recovery_scan(hmp, chain, 2328 info, sync_tid); 2329 --info->depth; 2330 } else { 2331 tmp_error = 0; 2332 } 2333 2334 /* 2335 * Flush the recovery at the PFS boundary to stage it for 2336 * the final flush of the super-root topology. 2337 */ 2338 if (tmp_error == 0 && 2339 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) && 2340 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) { 2341 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2342 HAMMER2_FLUSH_ALL); 2343 } 2344 rup_error |= tmp_error; 2345 } 2346 return ((error | rup_error) & ~HAMMER2_ERROR_EOF); 2347 } 2348 2349 /* 2350 * This fixes up an error introduced in earlier H2 implementations where 2351 * moving a PFS inode into an indirect block wound up causing the 2352 * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared. 2353 */ 2354 static 2355 int 2356 hammer2_fixup_pfses(hammer2_dev_t *hmp) 2357 { 2358 const hammer2_inode_data_t *ripdata; 2359 hammer2_chain_t *parent; 2360 hammer2_chain_t *chain; 2361 hammer2_key_t key_next; 2362 hammer2_pfs_t *spmp; 2363 int error; 2364 2365 error = 0; 2366 2367 /* 2368 * Lookup mount point under the media-localized super-root. 2369 * 2370 * cluster->pmp will incorrectly point to spmp and must be fixed 2371 * up later on. 2372 */ 2373 spmp = hmp->spmp; 2374 hammer2_inode_lock(spmp->iroot, 0); 2375 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS); 2376 chain = hammer2_chain_lookup(&parent, &key_next, 2377 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX, 2378 &error, 0); 2379 while (chain) { 2380 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) 2381 continue; 2382 if (chain->error) { 2383 kprintf("I/O error scanning PFS labels\n"); 2384 error |= chain->error; 2385 } else if ((chain->bref.flags & 2386 HAMMER2_BREF_FLAG_PFSROOT) == 0) { 2387 int error2; 2388 2389 ripdata = &chain->data->ipdata; 2390 hammer2_trans_init(hmp->spmp, 0); 2391 error2 = hammer2_chain_modify(chain, 2392 chain->bref.modify_tid, 2393 0, 0); 2394 if (error2 == 0) { 2395 kprintf("hammer2: Correct mis-flagged PFS %s\n", 2396 ripdata->filename); 2397 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT; 2398 } else { 2399 error |= error2; 2400 } 2401 hammer2_flush(chain, HAMMER2_FLUSH_TOP | 2402 HAMMER2_FLUSH_ALL); 2403 hammer2_trans_done(hmp->spmp, 0); 2404 } 2405 chain = hammer2_chain_next(&parent, chain, &key_next, 2406 key_next, HAMMER2_KEY_MAX, 2407 &error, 0); 2408 } 2409 if (parent) { 2410 hammer2_chain_unlock(parent); 2411 hammer2_chain_drop(parent); 2412 } 2413 hammer2_inode_unlock(spmp->iroot); 2414 2415 return error; 2416 } 2417 2418 /* 2419 * Sync a mount point; this is called periodically on a per-mount basis from 2420 * the filesystem syncer, and whenever a user issues a sync. 2421 */ 2422 int 2423 hammer2_vfs_sync(struct mount *mp, int waitfor) 2424 { 2425 int error; 2426 2427 error = hammer2_vfs_sync_pmp(MPTOPMP(mp), waitfor); 2428 2429 return error; 2430 } 2431 2432 /* 2433 * Because frontend operations lock vnodes before we get a chance to 2434 * lock the related inode, we can't just acquire a vnode lock without 2435 * risking a deadlock. The frontend may be holding a vnode lock while 2436 * also blocked on our SYNCQ flag while trying to get the inode lock. 2437 * 2438 * To deal with this situation we can check the vnode lock situation 2439 * after locking the inode and perform a work-around. 2440 */ 2441 int 2442 hammer2_vfs_sync_pmp(hammer2_pfs_t *pmp, int waitfor) 2443 { 2444 hammer2_inode_t *ip; 2445 hammer2_depend_t *depend; 2446 hammer2_depend_t *depend_next; 2447 struct vnode *vp; 2448 uint32_t pass2; 2449 int error; 2450 int wakecount; 2451 int dorestart; 2452 2453 /* 2454 * Move all inodes on sideq to syncq. This will clear sideq. 2455 * This should represent all flushable inodes. These inodes 2456 * will already have refs due to being on syncq or sideq. We 2457 * must do this all at once with the spinlock held to ensure that 2458 * all inode dependencies are part of the same flush. 2459 * 2460 * We should be able to do this asynchronously from frontend 2461 * operations because we will be locking the inodes later on 2462 * to actually flush them, and that will partition any frontend 2463 * op using the same inode. Either it has already locked the 2464 * inode and we will block, or it has not yet locked the inode 2465 * and it will block until we are finished flushing that inode. 2466 * 2467 * When restarting, only move the inodes flagged as PASS2 from 2468 * SIDEQ to SYNCQ. PASS2 propagation by inode_lock4() and 2469 * inode_depend() are atomic with the spin-lock. 2470 */ 2471 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH); 2472 #ifdef HAMMER2_DEBUG_SYNC 2473 kprintf("FILESYSTEM SYNC BOUNDARY\n"); 2474 #endif 2475 dorestart = 0; 2476 2477 /* 2478 * Move inodes from depq to syncq, releasing the related 2479 * depend structures. 2480 */ 2481 restart: 2482 #ifdef HAMMER2_DEBUG_SYNC 2483 kprintf("FILESYSTEM SYNC RESTART (%d)\n", dorestart); 2484 #endif 2485 hammer2_trans_setflags(pmp, 0/*HAMMER2_TRANS_COPYQ*/); 2486 hammer2_trans_clearflags(pmp, HAMMER2_TRANS_RESCAN); 2487 2488 /* 2489 * Move inodes from depq to syncq. When restarting, only depq's 2490 * marked pass2 are moved. 2491 */ 2492 hammer2_spin_ex(&pmp->list_spin); 2493 depend_next = TAILQ_FIRST(&pmp->depq); 2494 wakecount = 0; 2495 2496 while ((depend = depend_next) != NULL) { 2497 depend_next = TAILQ_NEXT(depend, entry); 2498 if (dorestart && depend->pass2 == 0) 2499 continue; 2500 TAILQ_FOREACH(ip, &depend->sideq, entry) { 2501 KKASSERT(ip->flags & HAMMER2_INODE_SIDEQ); 2502 atomic_set_int(&ip->flags, HAMMER2_INODE_SYNCQ); 2503 atomic_clear_int(&ip->flags, HAMMER2_INODE_SIDEQ); 2504 ip->depend = NULL; 2505 } 2506 2507 /* 2508 * NOTE: pmp->sideq_count includes both sideq and syncq 2509 */ 2510 TAILQ_CONCAT(&pmp->syncq, &depend->sideq, entry); 2511 2512 depend->count = 0; 2513 depend->pass2 = 0; 2514 TAILQ_REMOVE(&pmp->depq, depend, entry); 2515 } 2516 2517 hammer2_spin_unex(&pmp->list_spin); 2518 hammer2_trans_clearflags(pmp, /*HAMMER2_TRANS_COPYQ |*/ 2519 HAMMER2_TRANS_WAITING); 2520 dorestart = 0; 2521 2522 /* 2523 * sideq_count may have dropped enough to allow us to unstall 2524 * the frontend. 2525 */ 2526 hammer2_pfs_memory_wakeup(pmp, 0); 2527 2528 /* 2529 * Now run through all inodes on syncq. 2530 * 2531 * Flush transactions only interlock with other flush transactions. 2532 * Any conflicting frontend operations will block on the inode, but 2533 * may hold a vnode lock while doing so. 2534 */ 2535 hammer2_spin_ex(&pmp->list_spin); 2536 while ((ip = TAILQ_FIRST(&pmp->syncq)) != NULL) { 2537 /* 2538 * Remove the inode from the SYNCQ, transfer the syncq ref 2539 * to us. We must clear SYNCQ to allow any potential 2540 * front-end deadlock to proceed. We must set PASS2 so 2541 * the dependency code knows what to do. 2542 */ 2543 pass2 = ip->flags; 2544 cpu_ccfence(); 2545 if (atomic_cmpset_int(&ip->flags, 2546 pass2, 2547 (pass2 & ~(HAMMER2_INODE_SYNCQ | 2548 HAMMER2_INODE_SYNCQ_WAKEUP)) | 2549 HAMMER2_INODE_SYNCQ_PASS2) == 0) 2550 { 2551 continue; 2552 } 2553 TAILQ_REMOVE(&pmp->syncq, ip, entry); 2554 --pmp->sideq_count; 2555 hammer2_spin_unex(&pmp->list_spin); 2556 2557 /* 2558 * Tickle anyone waiting on ip->flags or the hysteresis 2559 * on the dirty inode count. 2560 */ 2561 if (pass2 & HAMMER2_INODE_SYNCQ_WAKEUP) 2562 wakeup(&ip->flags); 2563 if (++wakecount >= hammer2_limit_dirty_inodes / 20 + 1) { 2564 wakecount = 0; 2565 hammer2_pfs_memory_wakeup(pmp, 0); 2566 } 2567 2568 /* 2569 * Relock the inode, and we inherit a ref from the above. 2570 * We will check for a race after we acquire the vnode. 2571 */ 2572 hammer2_mtx_ex(&ip->lock); 2573 2574 /* 2575 * We need the vp in order to vfsync() dirty buffers, so if 2576 * one isn't attached we can skip it. 2577 * 2578 * Ordering the inode lock and then the vnode lock has the 2579 * potential to deadlock. If we had left SYNCQ set that could 2580 * also deadlock us against the frontend even if we don't hold 2581 * any locks, but the latter is not a problem now since we 2582 * cleared it. igetv will temporarily release the inode lock 2583 * in a safe manner to work-around the deadlock. 2584 * 2585 * Unfortunately it is still possible to deadlock when the 2586 * frontend obtains multiple inode locks, because all the 2587 * related vnodes are already locked (nor can the vnode locks 2588 * be released and reacquired without messing up RECLAIM and 2589 * INACTIVE sequencing). 2590 * 2591 * The solution for now is to move the vp back onto SIDEQ 2592 * and set dorestart, which will restart the flush after we 2593 * exhaust the current SYNCQ. Note that additional 2594 * dependencies may build up, so we definitely need to move 2595 * the whole SIDEQ back to SYNCQ when we restart. 2596 */ 2597 vp = ip->vp; 2598 if (vp) { 2599 if (vget(vp, LK_EXCLUSIVE|LK_NOWAIT)) { 2600 /* 2601 * Failed to get the vnode, requeue the inode 2602 * (PASS2 is already set so it will be found 2603 * again on the restart). Then unlock. 2604 */ 2605 vp = NULL; 2606 dorestart |= 1; 2607 #ifdef HAMMER2_DEBUG_SYNC 2608 kprintf("inum %ld (sync delayed by vnode)\n", 2609 (long)ip->meta.inum); 2610 #endif 2611 hammer2_inode_delayed_sideq(ip); 2612 2613 hammer2_mtx_unlock(&ip->lock); 2614 hammer2_inode_drop(ip); 2615 2616 /* 2617 * If PASS2 was previously set we might 2618 * be looping too hard, ask for a delay 2619 * along with the restart. 2620 */ 2621 if (pass2 & HAMMER2_INODE_SYNCQ_PASS2) 2622 dorestart |= 2; 2623 hammer2_spin_ex(&pmp->list_spin); 2624 continue; 2625 } 2626 } else { 2627 vp = NULL; 2628 } 2629 2630 /* 2631 * If the inode wound up on a SIDEQ again it will already be 2632 * prepped for another PASS2. In this situation if we flush 2633 * it now we will just wind up flushing it again in the same 2634 * syncer run, so we might as well not flush it now. 2635 */ 2636 if (ip->flags & HAMMER2_INODE_SIDEQ) { 2637 hammer2_mtx_unlock(&ip->lock); 2638 hammer2_inode_drop(ip); 2639 if (vp) 2640 vput(vp); 2641 dorestart |= 1; 2642 hammer2_spin_ex(&pmp->list_spin); 2643 continue; 2644 } 2645 2646 /* 2647 * Ok we have the inode exclusively locked and if vp is 2648 * not NULL that will also be exclusively locked. Do the 2649 * meat of the flush. 2650 * 2651 * vp token needed for v_rbdirty_tree check / vclrisdirty 2652 * sequencing. Though we hold the vnode exclusively so 2653 * we shouldn't need to hold the token also in this case. 2654 */ 2655 if (vp) { 2656 vfsync(vp, MNT_WAIT, 1, NULL, NULL); 2657 bio_track_wait(&vp->v_track_write, 0, 0); /* XXX */ 2658 } 2659 2660 /* 2661 * If the inode has not yet been inserted into the tree 2662 * we must do so. Then sync and flush it. The flush should 2663 * update the parent. 2664 */ 2665 if (ip->flags & HAMMER2_INODE_DELETING) { 2666 #ifdef HAMMER2_DEBUG_SYNC 2667 kprintf("inum %ld destroy\n", (long)ip->meta.inum); 2668 #endif 2669 hammer2_inode_chain_des(ip); 2670 atomic_add_long(&hammer2_iod_inode_deletes, 1); 2671 } else if (ip->flags & HAMMER2_INODE_CREATING) { 2672 #ifdef HAMMER2_DEBUG_SYNC 2673 kprintf("inum %ld insert\n", (long)ip->meta.inum); 2674 #endif 2675 hammer2_inode_chain_ins(ip); 2676 atomic_add_long(&hammer2_iod_inode_creates, 1); 2677 } 2678 #ifdef HAMMER2_DEBUG_SYNC 2679 kprintf("inum %ld chain-sync\n", (long)ip->meta.inum); 2680 #endif 2681 2682 /* 2683 * Because I kinda messed up the design and index the inodes 2684 * under the root inode, along side the directory entries, 2685 * we can't flush the inode index under the iroot until the 2686 * end. If we do it now we might miss effects created by 2687 * other inodes on the SYNCQ. 2688 * 2689 * Do a normal (non-FSSYNC) flush instead, which allows the 2690 * vnode code to work the same. We don't want to force iroot 2691 * back onto the SIDEQ, and we also don't want the flush code 2692 * to update pfs_iroot_blocksets until the final flush later. 2693 * 2694 * XXX at the moment this will likely result in a double-flush 2695 * of the iroot chain. 2696 */ 2697 hammer2_inode_chain_sync(ip); 2698 if (ip == pmp->iroot) { 2699 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP); 2700 } else { 2701 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2702 HAMMER2_XOP_FSSYNC); 2703 } 2704 if (vp) { 2705 lwkt_gettoken(&vp->v_token); 2706 if ((ip->flags & (HAMMER2_INODE_MODIFIED | 2707 HAMMER2_INODE_RESIZED | 2708 HAMMER2_INODE_DIRTYDATA)) == 0 && 2709 RB_EMPTY(&vp->v_rbdirty_tree) && 2710 !bio_track_active(&vp->v_track_write)) { 2711 vclrisdirty(vp); 2712 } else { 2713 hammer2_inode_delayed_sideq(ip); 2714 } 2715 lwkt_reltoken(&vp->v_token); 2716 vput(vp); 2717 vp = NULL; /* safety */ 2718 } 2719 atomic_clear_int(&ip->flags, HAMMER2_INODE_SYNCQ_PASS2); 2720 hammer2_inode_unlock(ip); /* unlock+drop */ 2721 /* ip pointer invalid */ 2722 2723 /* 2724 * If the inode got dirted after we dropped our locks, 2725 * it will have already been moved back to the SIDEQ. 2726 */ 2727 hammer2_spin_ex(&pmp->list_spin); 2728 } 2729 hammer2_spin_unex(&pmp->list_spin); 2730 hammer2_pfs_memory_wakeup(pmp, 0); 2731 2732 if (dorestart || (pmp->trans.flags & HAMMER2_TRANS_RESCAN)) { 2733 /* 2734 * bit 2 is set if something above thinks we might be 2735 * looping too hard, try to unclog the frontend 2736 * dependency and wait a bit before restarting. 2737 * 2738 * NOTE: The frontend could be stuck in h2memw, though 2739 * it isn't supposed to be holding vnode locks 2740 * in that case. 2741 */ 2742 if (dorestart & 2) { 2743 wakeup(&pmp->inmem_dirty_chains); 2744 tsleep(&dorestart, 0, "h2syndel", 2); 2745 } 2746 #ifdef HAMMER2_DEBUG_SYNC 2747 kprintf("FILESYSTEM SYNC STAGE 1 RESTART\n"); 2748 /*tsleep(&dorestart, 0, "h2STG1-R", hz*20);*/ 2749 #endif 2750 dorestart = 1; 2751 goto restart; 2752 } 2753 #ifdef HAMMER2_DEBUG_SYNC 2754 kprintf("FILESYSTEM SYNC STAGE 2 BEGIN\n"); 2755 /*tsleep(&dorestart, 0, "h2STG2", hz*20);*/ 2756 #endif 2757 2758 /* 2759 * We have to flush the PFS root last, even if it does not appear to 2760 * be dirty, because all the inodes in the PFS are indexed under it. 2761 * The normal flushing of iroot above would only occur if directory 2762 * entries under the root were changed. 2763 * 2764 * Specifying VOLHDR will cause an additionl flush of hmp->spmp 2765 * for the media making up the cluster. 2766 */ 2767 if ((ip = pmp->iroot) != NULL) { 2768 hammer2_inode_ref(ip); 2769 hammer2_mtx_ex(&ip->lock); 2770 hammer2_inode_chain_sync(ip); 2771 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP | 2772 HAMMER2_XOP_FSSYNC | 2773 HAMMER2_XOP_VOLHDR); 2774 hammer2_inode_unlock(ip); /* unlock+drop */ 2775 } 2776 #ifdef HAMMER2_DEBUG_SYNC 2777 kprintf("FILESYSTEM SYNC STAGE 2 DONE\n"); 2778 #endif 2779 2780 /* 2781 * device bioq sync 2782 */ 2783 hammer2_bioq_sync(pmp); 2784 2785 error = 0; /* XXX */ 2786 hammer2_trans_done(pmp, HAMMER2_TRANS_ISFLUSH); 2787 2788 return (error); 2789 } 2790 2791 static 2792 int 2793 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp) 2794 { 2795 hammer2_inode_t *ip; 2796 2797 KKASSERT(MAXFIDSZ >= 16); 2798 ip = VTOI(vp); 2799 fhp->fid_len = offsetof(struct fid, fid_data[16]); 2800 fhp->fid_ext = 0; 2801 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum; 2802 ((hammer2_tid_t *)fhp->fid_data)[1] = 0; 2803 2804 return 0; 2805 } 2806 2807 static 2808 int 2809 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 2810 struct fid *fhp, struct vnode **vpp) 2811 { 2812 hammer2_tid_t inum; 2813 int error; 2814 2815 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK; 2816 if (vpp) { 2817 if (inum == 1) 2818 error = hammer2_vfs_root(mp, vpp); 2819 else 2820 error = hammer2_vfs_vget(mp, NULL, inum, vpp); 2821 } else { 2822 error = 0; 2823 } 2824 return error; 2825 } 2826 2827 static 2828 int 2829 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam, 2830 int *exflagsp, struct ucred **credanonp) 2831 { 2832 hammer2_pfs_t *pmp; 2833 struct netcred *np; 2834 int error; 2835 2836 pmp = MPTOPMP(mp); 2837 np = vfs_export_lookup(mp, &pmp->export, nam); 2838 if (np) { 2839 *exflagsp = np->netc_exflags; 2840 *credanonp = &np->netc_anon; 2841 error = 0; 2842 } else { 2843 error = EACCES; 2844 } 2845 return error; 2846 } 2847 2848 /* 2849 * This handles hysteresis on regular file flushes. Because the BIOs are 2850 * routed to a thread it is possible for an excessive number to build up 2851 * and cause long front-end stalls long before the runningbuffspace limit 2852 * is hit, so we implement hammer2_flush_pipe to control the 2853 * hysteresis. 2854 * 2855 * This is a particular problem when compression is used. 2856 */ 2857 void 2858 hammer2_lwinprog_ref(hammer2_pfs_t *pmp) 2859 { 2860 atomic_add_int(&pmp->count_lwinprog, 1); 2861 } 2862 2863 void 2864 hammer2_lwinprog_drop(hammer2_pfs_t *pmp) 2865 { 2866 int lwinprog; 2867 2868 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1); 2869 if ((lwinprog & HAMMER2_LWINPROG_WAITING) && 2870 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) { 2871 atomic_clear_int(&pmp->count_lwinprog, 2872 HAMMER2_LWINPROG_WAITING); 2873 wakeup(&pmp->count_lwinprog); 2874 } 2875 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) && 2876 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) { 2877 atomic_clear_int(&pmp->count_lwinprog, 2878 HAMMER2_LWINPROG_WAITING0); 2879 wakeup(&pmp->count_lwinprog); 2880 } 2881 } 2882 2883 void 2884 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe) 2885 { 2886 int lwinprog; 2887 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING : 2888 HAMMER2_LWINPROG_WAITING0; 2889 2890 for (;;) { 2891 lwinprog = pmp->count_lwinprog; 2892 cpu_ccfence(); 2893 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2894 break; 2895 tsleep_interlock(&pmp->count_lwinprog, 0); 2896 atomic_set_int(&pmp->count_lwinprog, lwflag); 2897 lwinprog = pmp->count_lwinprog; 2898 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe) 2899 break; 2900 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz); 2901 } 2902 } 2903 2904 /* 2905 * It is possible for an excessive number of dirty chains or dirty inodes 2906 * to build up. When this occurs we start an asynchronous filesystem sync. 2907 * If the level continues to build up, we stall, waiting for it to drop, 2908 * with some hysteresis. 2909 * 2910 * This relies on the kernel calling hammer2_vfs_modifying() prior to 2911 * obtaining any vnode locks before making a modifying VOP call. 2912 */ 2913 static int 2914 hammer2_vfs_modifying(struct mount *mp) 2915 { 2916 if (mp->mnt_flag & MNT_RDONLY) 2917 return EROFS; 2918 hammer2_pfs_memory_wait(MPTOPMP(mp)); 2919 2920 return 0; 2921 } 2922 2923 /* 2924 * Initiate an asynchronous filesystem sync and, with hysteresis, 2925 * stall if the internal data structure count becomes too bloated. 2926 */ 2927 void 2928 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp) 2929 { 2930 uint32_t waiting; 2931 int pcatch; 2932 int error; 2933 int started; 2934 2935 if (pmp == NULL || pmp->mp == NULL) 2936 return; 2937 2938 started = 0; 2939 2940 for (;;) { 2941 waiting = pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK; 2942 cpu_ccfence(); 2943 2944 /* 2945 * Start the syncer running at 1/2 the limit to try 2946 * to avoid sleeping. 2947 */ 2948 if (waiting > hammer2_limit_dirty_chains / 2 || 2949 pmp->sideq_count > hammer2_limit_dirty_inodes / 2) 2950 { 2951 trigger_syncer(pmp->mp); 2952 } 2953 2954 /* 2955 * Stall at the limit waiting for the counts to drop. 2956 * This code will typically be woken up once the count 2957 * drops below 3/4 the limit, or in one second. 2958 */ 2959 if (waiting < hammer2_limit_dirty_chains && 2960 pmp->sideq_count < hammer2_limit_dirty_inodes) 2961 { 2962 break; 2963 } 2964 2965 if (started == 0) { 2966 trigger_syncer_start(pmp->mp); 2967 started = 1; 2968 } 2969 2970 /* 2971 * Interlocked re-test, sleep, and retry. 2972 */ 2973 pcatch = curthread->td_proc ? PCATCH : 0; 2974 tsleep_interlock(&pmp->inmem_dirty_chains, pcatch); 2975 2976 atomic_set_int(&pmp->inmem_dirty_chains, 2977 HAMMER2_DIRTYCHAIN_WAITING); 2978 2979 if (waiting < hammer2_limit_dirty_chains && 2980 pmp->sideq_count < hammer2_limit_dirty_inodes) { 2981 break; 2982 } 2983 error = tsleep(&pmp->inmem_dirty_chains, 2984 PINTERLOCKED | pcatch, 2985 "h2memw", hz); 2986 if (error == ERESTART) 2987 break; 2988 } 2989 if (started) 2990 trigger_syncer_stop(pmp->mp); 2991 } 2992 2993 /* 2994 * Wake up any stalled frontend ops waiting, with hysteresis, using 2995 * 2/3 of the limit. 2996 */ 2997 void 2998 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp, int count) 2999 { 3000 uint32_t waiting; 3001 3002 if (pmp) { 3003 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, count); 3004 /* don't need --waiting to test flag */ 3005 3006 if ((waiting & HAMMER2_DIRTYCHAIN_WAITING) && 3007 (pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK) <= 3008 hammer2_limit_dirty_chains * 2 / 3 && 3009 pmp->sideq_count <= hammer2_limit_dirty_inodes * 2 / 3) { 3010 atomic_clear_int(&pmp->inmem_dirty_chains, 3011 HAMMER2_DIRTYCHAIN_WAITING); 3012 wakeup(&pmp->inmem_dirty_chains); 3013 } 3014 } 3015 } 3016 3017 void 3018 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp) 3019 { 3020 if (pmp) { 3021 atomic_add_int(&pmp->inmem_dirty_chains, 1); 3022 } 3023 } 3024 3025 /* 3026 * Volume header data locks 3027 */ 3028 void 3029 hammer2_voldata_lock(hammer2_dev_t *hmp) 3030 { 3031 lockmgr(&hmp->vollk, LK_EXCLUSIVE); 3032 } 3033 3034 void 3035 hammer2_voldata_unlock(hammer2_dev_t *hmp) 3036 { 3037 lockmgr(&hmp->vollk, LK_RELEASE); 3038 } 3039 3040 /* 3041 * Caller indicates that the volume header is being modified. Flag 3042 * the related chain and adjust its transaction id. 3043 * 3044 * The transaction id is set to voldata.mirror_tid + 1, similar to 3045 * what hammer2_chain_modify() does. Be very careful here, volume 3046 * data can be updated independently of the rest of the filesystem. 3047 */ 3048 void 3049 hammer2_voldata_modify(hammer2_dev_t *hmp) 3050 { 3051 if ((hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) == 0) { 3052 atomic_add_long(&hammer2_count_modified_chains, 1); 3053 atomic_set_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED); 3054 hammer2_pfs_memory_inc(hmp->vchain.pmp); 3055 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid + 1; 3056 } 3057 } 3058 3059 /* 3060 * Returns 0 if the filesystem has tons of free space 3061 * Returns 1 if the filesystem has less than 10% remaining 3062 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining. 3063 */ 3064 int 3065 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred) 3066 { 3067 hammer2_pfs_t *pmp; 3068 hammer2_dev_t *hmp; 3069 hammer2_off_t free_reserved; 3070 hammer2_off_t free_nominal; 3071 int i; 3072 3073 pmp = ip->pmp; 3074 3075 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) { 3076 free_reserved = HAMMER2_SEGSIZE; 3077 free_nominal = 0x7FFFFFFFFFFFFFFFLLU; 3078 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) { 3079 hmp = pmp->pfs_hmps[i]; 3080 if (hmp == NULL) 3081 continue; 3082 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER && 3083 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER) 3084 continue; 3085 3086 if (free_nominal > hmp->voldata.allocator_free) 3087 free_nominal = hmp->voldata.allocator_free; 3088 if (free_reserved < hmp->free_reserved) 3089 free_reserved = hmp->free_reserved; 3090 } 3091 3092 /* 3093 * SMP races ok 3094 */ 3095 pmp->free_reserved = free_reserved; 3096 pmp->free_nominal = free_nominal; 3097 pmp->free_ticks = ticks; 3098 } else { 3099 free_reserved = pmp->free_reserved; 3100 free_nominal = pmp->free_nominal; 3101 } 3102 if (cred && cred->cr_uid != 0) { 3103 if ((int64_t)(free_nominal - bytes) < 3104 (int64_t)free_reserved) { 3105 return 2; 3106 } 3107 } else { 3108 if ((int64_t)(free_nominal - bytes) < 3109 (int64_t)free_reserved / 2) { 3110 return 2; 3111 } 3112 } 3113 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2) 3114 return 1; 3115 return 0; 3116 } 3117