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hammer2 - Revamp flush and xopq mechanism, stabilization
[dragonfly.git] / sys / vfs / hammer2 / hammer2_vfsops.c
blobeb376029e88a480c3d63160995701a91d57412c9
1 /*
2 * Copyright (c) 2011-2015 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/nlookup.h>
39 #include <sys/vnode.h>
40 #include <sys/mount.h>
41 #include <sys/fcntl.h>
42 #include <sys/buf.h>
43 #include <sys/uuid.h>
44 #include <sys/vfsops.h>
45 #include <sys/sysctl.h>
46 #include <sys/socket.h>
47 #include <sys/objcache.h>
48
49 #include <sys/proc.h>
50 #include <sys/namei.h>
51 #include <sys/mountctl.h>
52 #include <sys/dirent.h>
53 #include <sys/uio.h>
54
55 #include <sys/mutex.h>
56 #include <sys/mutex2.h>
57
58 #include "hammer2.h"
59 #include "hammer2_disk.h"
60 #include "hammer2_mount.h"
61 #include "hammer2_lz4.h"
62
63 #include "zlib/hammer2_zlib.h"
64
65 #define REPORT_REFS_ERRORS 1 /* XXX remove me */
66
67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
68
69 struct hammer2_sync_info {
70 int error;
71 int waitfor;
72 };
73
74 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
75 TAILQ_HEAD(hammer2_pfslist, hammer2_pfs);
76 static struct hammer2_mntlist hammer2_mntlist;
77 static struct hammer2_pfslist hammer2_pfslist;
78 static struct lock hammer2_mntlk;
79
80 int hammer2_debug;
81 int hammer2_cluster_read = 4; /* physical read-ahead */
82 int hammer2_cluster_write = 0; /* bdwrite() so later inval works */
83 int hammer2_dedup_enable = 1;
84 int hammer2_inval_enable = 0;
85 int hammer2_flush_pipe = 100;
86 int hammer2_synchronous_flush = 1;
87 int hammer2_dio_count;
88 long hammer2_chain_allocs;
89 long hammer2_chain_frees;
90 long hammer2_limit_dirty_chains;
91 long hammer2_count_modified_chains;
92 long hammer2_iod_invals;
93 long hammer2_iod_file_read;
94 long hammer2_iod_meta_read;
95 long hammer2_iod_indr_read;
96 long hammer2_iod_fmap_read;
97 long hammer2_iod_volu_read;
98 long hammer2_iod_file_write;
99 long hammer2_iod_file_wembed;
100 long hammer2_iod_file_wzero;
101 long hammer2_iod_file_wdedup;
102 long hammer2_iod_meta_write;
103 long hammer2_iod_indr_write;
104 long hammer2_iod_fmap_write;
105 long hammer2_iod_volu_write;
106
107 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
108 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
109 "Buffer used for compression.");
110
111 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
112 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
113 "Buffer used for decompression.");
114
115 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
116
117 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
118 &hammer2_debug, 0, "");
119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_read, CTLFLAG_RW,
120 &hammer2_cluster_read, 0, "");
121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW,
122 &hammer2_cluster_write, 0, "");
123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
124 &hammer2_dedup_enable, 0, "");
125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
126 &hammer2_inval_enable, 0, "");
127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
128 &hammer2_flush_pipe, 0, "");
129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
130 &hammer2_synchronous_flush, 0, "");
131 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
132 &hammer2_chain_allocs, 0, "");
133 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
134 &hammer2_chain_frees, 0, "");
135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
136 &hammer2_limit_dirty_chains, 0, "");
137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
138 &hammer2_count_modified_chains, 0, "");
139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
140 &hammer2_dio_count, 0, "");
141
142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
143 &hammer2_iod_invals, 0, "");
144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
145 &hammer2_iod_file_read, 0, "");
146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
147 &hammer2_iod_meta_read, 0, "");
148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
149 &hammer2_iod_indr_read, 0, "");
150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
151 &hammer2_iod_fmap_read, 0, "");
152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
153 &hammer2_iod_volu_read, 0, "");
154
155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
156 &hammer2_iod_file_write, 0, "");
157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
158 &hammer2_iod_file_wembed, 0, "");
159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
160 &hammer2_iod_file_wzero, 0, "");
161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
162 &hammer2_iod_file_wdedup, 0, "");
163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
164 &hammer2_iod_meta_write, 0, "");
165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
166 &hammer2_iod_indr_write, 0, "");
167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
168 &hammer2_iod_fmap_write, 0, "");
169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
170 &hammer2_iod_volu_write, 0, "");
171
172 long hammer2_check_icrc32;
173 long hammer2_check_xxhash64;
174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW,
175 &hammer2_check_icrc32, 0, "");
176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW,
177 &hammer2_check_xxhash64, 0, "");
178
179 static int hammer2_vfs_init(struct vfsconf *conf);
180 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
181 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
182 struct ucred *cred);
183 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
184 struct vnode *, struct ucred *);
185 static int hammer2_recovery(hammer2_dev_t *hmp);
186 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
187 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
188 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
189 struct ucred *cred);
190 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
191 struct ucred *cred);
192 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
193 struct fid *fhp, struct vnode **vpp);
194 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
195 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
196 int *exflagsp, struct ucred **credanonp);
197
198 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
199 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
200
201 static void hammer2_update_pmps(hammer2_dev_t *hmp);
202
203 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
204 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
205 hammer2_dev_t *hmp);
206
207 /*
208 * HAMMER2 vfs operations.
209 */
210 static struct vfsops hammer2_vfsops = {
211 .vfs_init = hammer2_vfs_init,
212 .vfs_uninit = hammer2_vfs_uninit,
213 .vfs_sync = hammer2_vfs_sync,
214 .vfs_mount = hammer2_vfs_mount,
215 .vfs_unmount = hammer2_vfs_unmount,
216 .vfs_root = hammer2_vfs_root,
217 .vfs_statfs = hammer2_vfs_statfs,
218 .vfs_statvfs = hammer2_vfs_statvfs,
219 .vfs_vget = hammer2_vfs_vget,
220 .vfs_vptofh = hammer2_vfs_vptofh,
221 .vfs_fhtovp = hammer2_vfs_fhtovp,
222 .vfs_checkexp = hammer2_vfs_checkexp
223 };
224
225 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
226
227 VFS_SET(hammer2_vfsops, hammer2, 0);
228 MODULE_VERSION(hammer2, 1);
229
230 static
231 int
232 hammer2_vfs_init(struct vfsconf *conf)
233 {
234 static struct objcache_malloc_args margs_read;
235 static struct objcache_malloc_args margs_write;
236 static struct objcache_malloc_args margs_vop;
237
238 int error;
239
240 error = 0;
241
242 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
243 error = EINVAL;
244 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
245 error = EINVAL;
246 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
247 error = EINVAL;
248
249 if (error)
250 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
251
252 margs_read.objsize = 65536;
253 margs_read.mtype = M_HAMMER2_DEBUFFER;
254
255 margs_write.objsize = 32768;
256 margs_write.mtype = M_HAMMER2_CBUFFER;
257
258 margs_vop.objsize = sizeof(hammer2_xop_t);
259 margs_vop.mtype = M_HAMMER2;
260
261 /*
262 * Note thaht for the XOPS cache we want backing store allocations
263 * to use M_ZERO. This is not allowed in objcache_get() (to avoid
264 * confusion), so use the backing store function that does it. This
265 * means that initial XOPS objects are zerod but REUSED objects are
266 * not. So we are responsible for cleaning the object up sufficiently
267 * for our needs before objcache_put()ing it back (typically just the
268 * FIFO indices).
269 */
270 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
271 0, 1, NULL, NULL, NULL,
272 objcache_malloc_alloc,
273 objcache_malloc_free,
274 &margs_read);
275 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
276 0, 1, NULL, NULL, NULL,
277 objcache_malloc_alloc,
278 objcache_malloc_free,
279 &margs_write);
280 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
281 0, 1, NULL, NULL, NULL,
282 objcache_malloc_alloc_zero,
283 objcache_malloc_free,
284 &margs_vop);
285
286
287 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
288 TAILQ_INIT(&hammer2_mntlist);
289 TAILQ_INIT(&hammer2_pfslist);
290
291 hammer2_limit_dirty_chains = maxvnodes / 10;
292 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
293 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
294
295 return (error);
296 }
297
298 static
299 int
300 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
301 {
302 objcache_destroy(cache_buffer_read);
303 objcache_destroy(cache_buffer_write);
304 objcache_destroy(cache_xops);
305 return 0;
306 }
307
308 /*
309 * Core PFS allocator. Used to allocate the pmp structure for PFS cluster
310 * mounts and the spmp structure for media (hmp) structures.
311 *
312 * pmp->modify_tid tracks new modify_tid transaction ids for front-end
313 * transactions. Note that synchronization does not use this field.
314 * (typically frontend operations and synchronization cannot run on the
315 * same PFS node at the same time).
316 *
317 * XXX check locking
318 */
319 hammer2_pfs_t *
320 hammer2_pfsalloc(hammer2_chain_t *chain, const hammer2_inode_data_t *ripdata,
321 hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
322 {
323 hammer2_inode_t *iroot;
324 hammer2_pfs_t *pmp;
325 int count;
326 int i;
327 int j;
328
329 /*
330 * Locate or create the PFS based on the cluster id. If ripdata
331 * is NULL this is a spmp which is unique and is always allocated.
332 *
333 * If the device is mounted in local mode all PFSs are considered
334 * independent and not part of any cluster (for debugging only).
335 */
336 if (ripdata) {
337 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
338 if (force_local != pmp->force_local)
339 continue;
340 if (force_local == NULL &&
341 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
342 sizeof(pmp->pfs_clid)) == 0) {
343 break;
344 } else if (force_local && pmp->pfs_names[0] &&
345 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
346 break;
347 }
348 }
349 } else {
350 pmp = NULL;
351 }
352
353 if (pmp == NULL) {
354 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
355 pmp->force_local = force_local;
356 hammer2_trans_manage_init(pmp);
357 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
358 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
359 lockinit(&pmp->lock, "pfslk", 0, 0);
360 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
361 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
362 spin_init(&pmp->xop_spin, "h2xop");
363 spin_init(&pmp->lru_spin, "h2lru");
364 RB_INIT(&pmp->inum_tree);
365 TAILQ_INIT(&pmp->sideq);
366 TAILQ_INIT(&pmp->lru_list);
367 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
368
369 /*
370 * Distribute backend operations to threads
371 */
372 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
373 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
374
375 /*
376 * Save the last media transaction id for the flusher. Set
377 * initial
378 */
379 if (ripdata)
380 pmp->pfs_clid = ripdata->meta.pfs_clid;
381 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
382
383 /*
384 * The synchronization thread may start too early, make
385 * sure it stays frozen until we are ready to let it go.
386 * XXX
387 */
388 /*
389 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
390 HAMMER2_THREAD_REMASTER;
391 */
392 }
393
394 /*
395 * Create the PFS's root inode.
396 */
397 if ((iroot = pmp->iroot) == NULL) {
398 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
399 pmp->iroot = iroot;
400 hammer2_inode_ref(iroot);
401 hammer2_inode_unlock(iroot);
402 }
403
404 /*
405 * Stop here if no chain is passed in.
406 */
407 if (chain == NULL)
408 goto done;
409
410 /*
411 * When a chain is passed in we must add it to the PFS's root
412 * inode, update pmp->pfs_types[], and update the syncronization
413 * threads.
414 *
415 * When forcing local mode, mark the PFS as a MASTER regardless.
416 *
417 * At the moment empty spots can develop due to removals or failures.
418 * Ultimately we want to re-fill these spots but doing so might
419 * confused running code. XXX
420 */
421 hammer2_inode_ref(iroot);
422 hammer2_mtx_ex(&iroot->lock);
423 j = iroot->cluster.nchains;
424
425 kprintf("add PFS to pmp %p[%d]\n", pmp, j);
426
427 if (j == HAMMER2_MAXCLUSTER) {
428 kprintf("hammer2_mount: cluster full!\n");
429 /* XXX fatal error? */
430 } else {
431 KKASSERT(chain->pmp == NULL);
432 chain->pmp = pmp;
433 hammer2_chain_ref(chain);
434 iroot->cluster.array[j].chain = chain;
435 if (force_local)
436 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
437 else
438 pmp->pfs_types[j] = ripdata->meta.pfs_type;
439 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
440 pmp->pfs_hmps[j] = chain->hmp;
441
442 /*
443 * If the PFS is already mounted we must account
444 * for the mount_count here.
445 */
446 if (pmp->mp)
447 ++chain->hmp->mount_count;
448
449 /*
450 * May have to fixup dirty chain tracking. Previous
451 * pmp was NULL so nothing to undo.
452 */
453 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
454 hammer2_pfs_memory_inc(pmp);
455 ++j;
456 }
457 iroot->cluster.nchains = j;
458
459 /*
460 * Update nmasters from any PFS inode which is part of the cluster.
461 * It is possible that this will result in a value which is too
462 * high. MASTER PFSs are authoritative for pfs_nmasters and will
463 * override this value later on.
464 *
465 * (This informs us of masters that might not currently be
466 * discoverable by this mount).
467 */
468 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
469 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
470 }
471
472 /*
473 * Count visible masters. Masters are usually added with
474 * ripdata->meta.pfs_nmasters set to 1. This detects when there
475 * are more (XXX and must update the master inodes).
476 */
477 count = 0;
478 for (i = 0; i < iroot->cluster.nchains; ++i) {
479 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
480 ++count;
481 }
482 if (pmp->pfs_nmasters < count)
483 pmp->pfs_nmasters = count;
484
485 /*
486 * Create missing synchronization and support threads.
487 *
488 * Single-node masters (including snapshots) have nothing to
489 * synchronize and do not require this thread.
490 *
491 * Multi-node masters or any number of soft masters, slaves, copy,
492 * or other PFS types need the thread.
493 *
494 * Each thread is responsible for its particular cluster index.
495 * We use independent threads so stalls or mismatches related to
496 * any given target do not affect other targets.
497 */
498 for (i = 0; i < iroot->cluster.nchains; ++i) {
499 /*
500 * Single-node masters (including snapshots) have nothing
501 * to synchronize and will make direct xops support calls,
502 * thus they do not require this thread.
503 *
504 * Note that there can be thousands of snapshots. We do not
505 * want to create thousands of threads.
506 */
507 if (pmp->pfs_nmasters <= 1 &&
508 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
509 continue;
510 }
511
512 /*
513 * Sync support thread
514 */
515 if (pmp->sync_thrs[i].td == NULL) {
516 hammer2_thr_create(&pmp->sync_thrs[i], pmp,
517 "h2nod", i, -1,
518 hammer2_primary_sync_thread);
519 }
520 }
521
522 /*
523 * Create missing Xop threads
524 */
525 if (pmp->mp)
526 hammer2_xop_helper_create(pmp);
527
528 hammer2_mtx_unlock(&iroot->lock);
529 hammer2_inode_drop(iroot);
530 done:
531 return pmp;
532 }
533
534 /*
535 * Destroy a PFS, typically only occurs after the last mount on a device
536 * has gone away.
537 */
538 static void
539 hammer2_pfsfree(hammer2_pfs_t *pmp)
540 {
541 hammer2_inode_t *iroot;
542 hammer2_chain_t *chain;
543 int i;
544 int j;
545
546 /*
547 * Cleanup our reference on iroot. iroot is (should) not be needed
548 * by the flush code.
549 */
550 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
551
552 iroot = pmp->iroot;
553 if (iroot) {
554 for (i = 0; i < iroot->cluster.nchains; ++i) {
555 hammer2_thr_delete(&pmp->sync_thrs[i]);
556 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
557 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
558 }
559 #if REPORT_REFS_ERRORS
560 if (pmp->iroot->refs != 1)
561 kprintf("PMP->IROOT %p REFS WRONG %d\n",
562 pmp->iroot, pmp->iroot->refs);
563 #else
564 KKASSERT(pmp->iroot->refs == 1);
565 #endif
566 /* ref for pmp->iroot */
567 hammer2_inode_drop(pmp->iroot);
568 pmp->iroot = NULL;
569 }
570
571 /*
572 * Cleanup chains remaining on LRU list.
573 */
574 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count);
575 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
576 hammer2_chain_ref(chain);
577 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
578 hammer2_chain_drop(chain);
579 }
580
581 /*
582 * Free remaining pmp resources
583 */
584 kmalloc_destroy(&pmp->mmsg);
585 kmalloc_destroy(&pmp->minode);
586
587 kfree(pmp, M_HAMMER2);
588 }
589
590 /*
591 * Remove all references to hmp from the pfs list. Any PFS which becomes
592 * empty is terminated and freed.
593 *
594 * XXX inefficient.
595 */
596 static void
597 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
598 {
599 hammer2_pfs_t *pmp;
600 hammer2_inode_t *iroot;
601 hammer2_chain_t *rchain;
602 int didfreeze;
603 int i;
604 int j;
605
606 again:
607 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
608 if ((iroot = pmp->iroot) == NULL)
609 continue;
610 if (hmp->spmp == pmp) {
611 kprintf("unmount hmp %p remove spmp %p\n",
612 hmp, pmp);
613 hmp->spmp = NULL;
614 }
615
616 /*
617 * Determine if this PFS is affected. If it is we must
618 * freeze all management threads and lock its iroot.
619 *
620 * Freezing a management thread forces it idle, operations
621 * in-progress will be aborted and it will have to start
622 * over again when unfrozen, or exit if told to exit.
623 */
624 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
625 if (pmp->pfs_hmps[i] == hmp)
626 break;
627 }
628 if (i != HAMMER2_MAXCLUSTER) {
629 /*
630 * Make sure all synchronization threads are locked
631 * down.
632 */
633 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
634 if (pmp->pfs_hmps[i] == NULL)
635 continue;
636 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
637 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
638 hammer2_thr_freeze_async(
639 &pmp->xop_groups[j].thrs[i]);
640 }
641 }
642 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
643 if (pmp->pfs_hmps[i] == NULL)
644 continue;
645 hammer2_thr_freeze(&pmp->sync_thrs[i]);
646 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
647 hammer2_thr_freeze(
648 &pmp->xop_groups[j].thrs[i]);
649 }
650 }
651
652 /*
653 * Lock the inode and clean out matching chains.
654 * Note that we cannot use hammer2_inode_lock_*()
655 * here because that would attempt to validate the
656 * cluster that we are in the middle of ripping
657 * apart.
658 *
659 * WARNING! We are working directly on the inodes
660 * embedded cluster.
661 */
662 hammer2_mtx_ex(&iroot->lock);
663
664 /*
665 * Remove the chain from matching elements of the PFS.
666 */
667 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
668 if (pmp->pfs_hmps[i] != hmp)
669 continue;
670 hammer2_thr_delete(&pmp->sync_thrs[i]);
671 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
672 hammer2_thr_delete(
673 &pmp->xop_groups[j].thrs[i]);
674 }
675 rchain = iroot->cluster.array[i].chain;
676 iroot->cluster.array[i].chain = NULL;
677 pmp->pfs_types[i] = 0;
678 if (pmp->pfs_names[i]) {
679 kfree(pmp->pfs_names[i], M_HAMMER2);
680 pmp->pfs_names[i] = NULL;
681 }
682 if (rchain) {
683 hammer2_chain_drop(rchain);
684 /* focus hint */
685 if (iroot->cluster.focus == rchain)
686 iroot->cluster.focus = NULL;
687 }
688 pmp->pfs_hmps[i] = NULL;
689 }
690 hammer2_mtx_unlock(&iroot->lock);
691 didfreeze = 1; /* remaster, unfreeze down below */
692 } else {
693 didfreeze = 0;
694 }
695
696 /*
697 * Cleanup trailing chains. Gaps may remain.
698 */
699 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
700 if (pmp->pfs_hmps[i])
701 break;
702 }
703 iroot->cluster.nchains = i + 1;
704
705 /*
706 * If the PMP has no elements remaining we can destroy it.
707 * (this will transition management threads from frozen->exit).
708 */
709 if (iroot->cluster.nchains == 0) {
710 kprintf("unmount hmp %p last ref to PMP=%p\n",
711 hmp, pmp);
712 hammer2_pfsfree(pmp);
713 goto again;
714 }
715
716 /*
717 * If elements still remain we need to set the REMASTER
718 * flag and unfreeze it.
719 */
720 if (didfreeze) {
721 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
722 if (pmp->pfs_hmps[i] == NULL)
723 continue;
724 hammer2_thr_remaster(&pmp->sync_thrs[i]);
725 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
726 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
727 hammer2_thr_remaster(
728 &pmp->xop_groups[j].thrs[i]);
729 hammer2_thr_unfreeze(
730 &pmp->xop_groups[j].thrs[i]);
731 }
732 }
733 }
734 }
735 }
736
737 /*
738 * Mount or remount HAMMER2 fileystem from physical media
739 *
740 * mountroot
741 * mp mount point structure
742 * path NULL
743 * data <unused>
744 * cred <unused>
745 *
746 * mount
747 * mp mount point structure
748 * path path to mount point
749 * data pointer to argument structure in user space
750 * volume volume path (device@LABEL form)
751 * hflags user mount flags
752 * cred user credentials
753 *
754 * RETURNS: 0 Success
755 * !0 error number
756 */
757 static
758 int
759 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
760 struct ucred *cred)
761 {
762 struct hammer2_mount_info info;
763 hammer2_pfs_t *pmp;
764 hammer2_pfs_t *spmp;
765 hammer2_dev_t *hmp;
766 hammer2_dev_t *force_local;
767 hammer2_key_t key_next;
768 hammer2_key_t key_dummy;
769 hammer2_key_t lhc;
770 struct vnode *devvp;
771 struct nlookupdata nd;
772 hammer2_chain_t *parent;
773 hammer2_chain_t *chain;
774 hammer2_cluster_t *cluster;
775 const hammer2_inode_data_t *ripdata;
776 hammer2_blockref_t bref;
777 struct file *fp;
778 char devstr[MNAMELEN];
779 size_t size;
780 size_t done;
781 char *dev;
782 char *label;
783 int ronly = 1;
784 int error;
785 int cache_index;
786 int i;
787
788 hmp = NULL;
789 pmp = NULL;
790 dev = NULL;
791 label = NULL;
792 devvp = NULL;
793 cache_index = -1;
794
795 kprintf("hammer2_mount\n");
796
797 if (path == NULL) {
798 /*
799 * Root mount
800 */
801 bzero(&info, sizeof(info));
802 info.cluster_fd = -1;
803 ksnprintf(devstr, sizeof(devstr), "%s",
804 mp->mnt_stat.f_mntfromname);
805 kprintf("hammer2_mount: root '%s'\n", devstr);
806 } else {
807 /*
808 * Non-root mount or updating a mount
809 */
810 error = copyin(data, &info, sizeof(info));
811 if (error)
812 return (error);
813
814 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
815 if (error)
816 return (error);
817 }
818
819 /* Extract device and label */
820 dev = devstr;
821 label = strchr(devstr, '@');
822 if (label == NULL ||
823 ((label + 1) - dev) > done) {
824 return (EINVAL);
825 }
826 *label = '\0';
827 label++;
828 if (*label == '\0')
829 return (EINVAL);
830
831 if (mp->mnt_flag & MNT_UPDATE) {
832 /*
833 * Update mount. Note that pmp->iroot->cluster is
834 * an inode-embedded cluster and thus cannot be
835 * directly locked.
836 *
837 * XXX HAMMER2 needs to implement NFS export via
838 * mountctl.
839 */
840 pmp = MPTOPMP(mp);
841 pmp->hflags = info.hflags;
842 cluster = &pmp->iroot->cluster;
843 for (i = 0; i < cluster->nchains; ++i) {
844 if (cluster->array[i].chain == NULL)
845 continue;
846 hmp = cluster->array[i].chain->hmp;
847 devvp = hmp->devvp;
848 error = hammer2_remount(hmp, mp, path,
849 devvp, cred);
850 if (error)
851 break;
852 }
853
854 return error;
855 }
856
857 /*
858 * HMP device mount
859 *
860 * Lookup name and verify it refers to a block device.
861 */
862 if (path) {
863 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
864 if (error == 0)
865 error = nlookup(&nd);
866 if (error == 0)
867 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
868 nlookup_done(&nd);
869 } else {
870 /* root mount */
871 cdev_t cdev = kgetdiskbyname(dev);
872 error = bdevvp(cdev, &devvp);
873 if (error)
874 kprintf("hammer2: cannot find '%s'\n", dev);
875 }
876
877 if (error == 0) {
878 if (vn_isdisk(devvp, &error))
879 error = vfs_mountedon(devvp);
880 }
881
882 /*
883 * Determine if the device has already been mounted. After this
884 * check hmp will be non-NULL if we are doing the second or more
885 * hammer2 mounts from the same device.
886 */
887 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
888 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
889 if (hmp->devvp == devvp)
890 break;
891 }
892
893 /*
894 * Open the device if this isn't a secondary mount and construct
895 * the H2 device mount (hmp).
896 */
897 if (hmp == NULL) {
898 hammer2_chain_t *schain;
899 hammer2_xid_t xid;
900
901 if (error == 0 && vcount(devvp) > 0)
902 error = EBUSY;
903
904 /*
905 * Now open the device
906 */
907 if (error == 0) {
908 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
909 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
910 error = vinvalbuf(devvp, V_SAVE, 0, 0);
911 if (error == 0) {
912 error = VOP_OPEN(devvp,
913 ronly ? FREAD : FREAD | FWRITE,
914 FSCRED, NULL);
915 }
916 vn_unlock(devvp);
917 }
918 if (error && devvp) {
919 vrele(devvp);
920 devvp = NULL;
921 }
922 if (error) {
923 lockmgr(&hammer2_mntlk, LK_RELEASE);
924 return error;
925 }
926 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
927 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
928 hmp->ronly = ronly;
929 hmp->devvp = devvp;
930 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
931 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
932 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
933 RB_INIT(&hmp->iotree);
934 spin_init(&hmp->io_spin, "hm2mount_io");
935 spin_init(&hmp->list_spin, "hm2mount_list");
936 TAILQ_INIT(&hmp->flushq);
937
938 lockinit(&hmp->vollk, "h2vol", 0, 0);
939 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
940
941 /*
942 * vchain setup. vchain.data is embedded.
943 * vchain.refs is initialized and will never drop to 0.
944 *
945 * NOTE! voldata is not yet loaded.
946 */
947 hmp->vchain.hmp = hmp;
948 hmp->vchain.refs = 1;
949 hmp->vchain.data = (void *)&hmp->voldata;
950 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
951 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
952 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
953
954 hammer2_chain_core_init(&hmp->vchain);
955 /* hmp->vchain.u.xxx is left NULL */
956
957 /*
958 * fchain setup. fchain.data is embedded.
959 * fchain.refs is initialized and will never drop to 0.
960 *
961 * The data is not used but needs to be initialized to
962 * pass assertion muster. We use this chain primarily
963 * as a placeholder for the freemap's top-level RBTREE
964 * so it does not interfere with the volume's topology
965 * RBTREE.
966 */
967 hmp->fchain.hmp = hmp;
968 hmp->fchain.refs = 1;
969 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
970 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
971 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
972 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
973 hmp->fchain.bref.methods =
974 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
975 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
976
977 hammer2_chain_core_init(&hmp->fchain);
978 /* hmp->fchain.u.xxx is left NULL */
979
980 /*
981 * Install the volume header and initialize fields from
982 * voldata.
983 */
984 error = hammer2_install_volume_header(hmp);
985 if (error) {
986 hammer2_unmount_helper(mp, NULL, hmp);
987 lockmgr(&hammer2_mntlk, LK_RELEASE);
988 hammer2_vfs_unmount(mp, MNT_FORCE);
989 return error;
990 }
991
992 /*
993 * Really important to get these right or flush will get
994 * confused.
995 */
996 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
997 kprintf("alloc spmp %p tid %016jx\n",
998 hmp->spmp, hmp->voldata.mirror_tid);
999 spmp = hmp->spmp;
1000
1001 /*
1002 * Dummy-up vchain and fchain's modify_tid. mirror_tid
1003 * is inherited from the volume header.
1004 */
1005 xid = 0;
1006 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1007 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1008 hmp->vchain.pmp = spmp;
1009 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1010 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1011 hmp->fchain.pmp = spmp;
1012
1013 /*
1014 * First locate the super-root inode, which is key 0
1015 * relative to the volume header's blockset.
1016 *
1017 * Then locate the root inode by scanning the directory keyspace
1018 * represented by the label.
1019 */
1020 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1021 schain = hammer2_chain_lookup(&parent, &key_dummy,
1022 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1023 &cache_index, 0);
1024 hammer2_chain_lookup_done(parent);
1025 if (schain == NULL) {
1026 kprintf("hammer2_mount: invalid super-root\n");
1027 hammer2_unmount_helper(mp, NULL, hmp);
1028 lockmgr(&hammer2_mntlk, LK_RELEASE);
1029 hammer2_vfs_unmount(mp, MNT_FORCE);
1030 return EINVAL;
1031 }
1032 if (schain->error) {
1033 kprintf("hammer2_mount: error %s reading super-root\n",
1034 hammer2_error_str(schain->error));
1035 hammer2_chain_unlock(schain);
1036 hammer2_chain_drop(schain);
1037 schain = NULL;
1038 hammer2_unmount_helper(mp, NULL, hmp);
1039 lockmgr(&hammer2_mntlk, LK_RELEASE);
1040 hammer2_vfs_unmount(mp, MNT_FORCE);
1041 return EINVAL;
1042 }
1043
1044 /*
1045 * The super-root always uses an inode_tid of 1 when
1046 * creating PFSs.
1047 */
1048 spmp->inode_tid = 1;
1049 spmp->modify_tid = schain->bref.modify_tid + 1;
1050
1051 /*
1052 * Sanity-check schain's pmp and finish initialization.
1053 * Any chain belonging to the super-root topology should
1054 * have a NULL pmp (not even set to spmp).
1055 */
1056 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1057 KKASSERT(schain->pmp == NULL);
1058 spmp->pfs_clid = ripdata->meta.pfs_clid;
1059
1060 /*
1061 * Replace the dummy spmp->iroot with a real one. It's
1062 * easier to just do a wholesale replacement than to try
1063 * to update the chain and fixup the iroot fields.
1064 *
1065 * The returned inode is locked with the supplied cluster.
1066 */
1067 cluster = hammer2_cluster_from_chain(schain);
1068 hammer2_inode_drop(spmp->iroot);
1069 spmp->iroot = NULL;
1070 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1071 spmp->spmp_hmp = hmp;
1072 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1073 spmp->pfs_hmps[0] = hmp;
1074 hammer2_inode_ref(spmp->iroot);
1075 hammer2_inode_unlock(spmp->iroot);
1076 hammer2_cluster_unlock(cluster);
1077 hammer2_cluster_drop(cluster);
1078 schain = NULL;
1079 /* leave spmp->iroot with one ref */
1080
1081 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1082 error = hammer2_recovery(hmp);
1083 /* XXX do something with error */
1084 }
1085 hammer2_update_pmps(hmp);
1086 hammer2_iocom_init(hmp);
1087
1088 /*
1089 * Ref the cluster management messaging descriptor. The mount
1090 * program deals with the other end of the communications pipe.
1091 *
1092 * Root mounts typically do not supply one.
1093 */
1094 if (info.cluster_fd >= 0) {
1095 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1096 if (fp) {
1097 hammer2_cluster_reconnect(hmp, fp);
1098 } else {
1099 kprintf("hammer2_mount: bad cluster_fd!\n");
1100 }
1101 }
1102 } else {
1103 spmp = hmp->spmp;
1104 if (info.hflags & HMNT2_DEVFLAGS) {
1105 kprintf("hammer2: Warning: mount flags pertaining "
1106 "to the whole device may only be specified "
1107 "on the first mount of the device: %08x\n",
1108 info.hflags & HMNT2_DEVFLAGS);
1109 }
1110 }
1111
1112 /*
1113 * Force local mount (disassociate all PFSs from their clusters).
1114 * Used primarily for debugging.
1115 */
1116 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1117
1118 /*
1119 * Lookup the mount point under the media-localized super-root.
1120 * Scanning hammer2_pfslist doesn't help us because it represents
1121 * PFS cluster ids which can aggregate several named PFSs together.
1122 *
1123 * cluster->pmp will incorrectly point to spmp and must be fixed
1124 * up later on.
1125 */
1126 hammer2_inode_lock(spmp->iroot, 0);
1127 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1128 lhc = hammer2_dirhash(label, strlen(label));
1129 chain = hammer2_chain_lookup(&parent, &key_next,
1130 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1131 &cache_index, 0);
1132 while (chain) {
1133 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1134 strcmp(label, chain->data->ipdata.filename) == 0) {
1135 break;
1136 }
1137 chain = hammer2_chain_next(&parent, chain, &key_next,
1138 key_next,
1139 lhc + HAMMER2_DIRHASH_LOMASK,
1140 &cache_index, 0);
1141 }
1142 if (parent) {
1143 hammer2_chain_unlock(parent);
1144 hammer2_chain_drop(parent);
1145 }
1146 hammer2_inode_unlock(spmp->iroot);
1147
1148 /*
1149 * PFS could not be found?
1150 */
1151 if (chain == NULL) {
1152 kprintf("hammer2_mount: PFS label not found\n");
1153 hammer2_unmount_helper(mp, NULL, hmp);
1154 lockmgr(&hammer2_mntlk, LK_RELEASE);
1155 hammer2_vfs_unmount(mp, MNT_FORCE);
1156
1157 return EINVAL;
1158 }
1159
1160 /*
1161 * Acquire the pmp structure (it should have already been allocated
1162 * via hammer2_update_pmps() so do not pass cluster in to add to
1163 * available chains).
1164 *
1165 * Check if the cluster has already been mounted. A cluster can
1166 * only be mounted once, use null mounts to mount additional copies.
1167 */
1168 ripdata = &chain->data->ipdata;
1169 bref = chain->bref;
1170 pmp = hammer2_pfsalloc(NULL, ripdata, bref.modify_tid, force_local);
1171 hammer2_chain_unlock(chain);
1172 hammer2_chain_drop(chain);
1173
1174 if (pmp->mp) {
1175 kprintf("hammer2_mount: PFS already mounted!\n");
1176 hammer2_unmount_helper(mp, NULL, hmp);
1177 lockmgr(&hammer2_mntlk, LK_RELEASE);
1178 hammer2_vfs_unmount(mp, MNT_FORCE);
1179
1180 return EBUSY;
1181 }
1182
1183 /*
1184 * Finish the mount
1185 */
1186 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1187
1188 pmp->hflags = info.hflags;
1189 mp->mnt_flag = MNT_LOCAL;
1190 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
1191 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
1192
1193 /*
1194 * required mount structure initializations
1195 */
1196 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1197 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1198
1199 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1200 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1201
1202 /*
1203 * Optional fields
1204 */
1205 mp->mnt_iosize_max = MAXPHYS;
1206
1207 /*
1208 * Connect up mount pointers.
1209 */
1210 hammer2_mount_helper(mp, pmp);
1211
1212 lockmgr(&hammer2_mntlk, LK_RELEASE);
1213
1214 /*
1215 * Finish setup
1216 */
1217 vfs_getnewfsid(mp);
1218 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1219 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1220 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1221
1222 if (path) {
1223 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1224 MNAMELEN - 1, &size);
1225 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1226 } /* else root mount, already in there */
1227
1228 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1229 if (path) {
1230 copyinstr(path, mp->mnt_stat.f_mntonname,
1231 sizeof(mp->mnt_stat.f_mntonname) - 1,
1232 &size);
1233 } else {
1234 /* root mount */
1235 mp->mnt_stat.f_mntonname[0] = '/';
1236 }
1237
1238 /*
1239 * Initial statfs to prime mnt_stat.
1240 */
1241 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1242
1243 return 0;
1244 }
1245
1246 /*
1247 * Scan PFSs under the super-root and create hammer2_pfs structures.
1248 */
1249 static
1250 void
1251 hammer2_update_pmps(hammer2_dev_t *hmp)
1252 {
1253 const hammer2_inode_data_t *ripdata;
1254 hammer2_chain_t *parent;
1255 hammer2_chain_t *chain;
1256 hammer2_blockref_t bref;
1257 hammer2_dev_t *force_local;
1258 hammer2_pfs_t *spmp;
1259 hammer2_pfs_t *pmp;
1260 hammer2_key_t key_next;
1261 int cache_index = -1;
1262
1263 /*
1264 * Force local mount (disassociate all PFSs from their clusters).
1265 * Used primarily for debugging.
1266 */
1267 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1268
1269 /*
1270 * Lookup mount point under the media-localized super-root.
1271 *
1272 * cluster->pmp will incorrectly point to spmp and must be fixed
1273 * up later on.
1274 */
1275 spmp = hmp->spmp;
1276 hammer2_inode_lock(spmp->iroot, 0);
1277 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1278 chain = hammer2_chain_lookup(&parent, &key_next,
1279 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1280 &cache_index, 0);
1281 while (chain) {
1282 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1283 continue;
1284 ripdata = &chain->data->ipdata;
1285 bref = chain->bref;
1286 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1287
1288 pmp = hammer2_pfsalloc(chain, ripdata,
1289 bref.modify_tid, force_local);
1290 chain = hammer2_chain_next(&parent, chain, &key_next,
1291 key_next, HAMMER2_KEY_MAX,
1292 &cache_index, 0);
1293 }
1294 if (parent) {
1295 hammer2_chain_unlock(parent);
1296 hammer2_chain_drop(parent);
1297 }
1298 hammer2_inode_unlock(spmp->iroot);
1299 }
1300
1301 static
1302 int
1303 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1304 struct vnode *devvp, struct ucred *cred)
1305 {
1306 int error;
1307
1308 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1309 error = hammer2_recovery(hmp);
1310 } else {
1311 error = 0;
1312 }
1313 return error;
1314 }
1315
1316 static
1317 int
1318 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1319 {
1320 hammer2_pfs_t *pmp;
1321 int flags;
1322 int error = 0;
1323
1324 pmp = MPTOPMP(mp);
1325
1326 if (pmp == NULL)
1327 return(0);
1328
1329 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1330
1331 /*
1332 * If mount initialization proceeded far enough we must flush
1333 * its vnodes and sync the underlying mount points. Three syncs
1334 * are required to fully flush the filesystem (freemap updates lag
1335 * by one flush, and one extra for safety).
1336 */
1337 if (mntflags & MNT_FORCE)
1338 flags = FORCECLOSE;
1339 else
1340 flags = 0;
1341 if (pmp->iroot) {
1342 error = vflush(mp, 0, flags);
1343 if (error)
1344 goto failed;
1345 hammer2_vfs_sync(mp, MNT_WAIT);
1346 hammer2_vfs_sync(mp, MNT_WAIT);
1347 hammer2_vfs_sync(mp, MNT_WAIT);
1348 }
1349
1350 /*
1351 * Cleanup the frontend support XOPS threads
1352 */
1353 hammer2_xop_helper_cleanup(pmp);
1354
1355 if (pmp->mp)
1356 hammer2_unmount_helper(mp, pmp, NULL);
1357
1358 error = 0;
1359 failed:
1360 lockmgr(&hammer2_mntlk, LK_RELEASE);
1361
1362 return (error);
1363 }
1364
1365 /*
1366 * Mount helper, hook the system mount into our PFS.
1367 * The mount lock is held.
1368 *
1369 * We must bump the mount_count on related devices for any
1370 * mounted PFSs.
1371 */
1372 static
1373 void
1374 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1375 {
1376 hammer2_cluster_t *cluster;
1377 hammer2_chain_t *rchain;
1378 int i;
1379
1380 mp->mnt_data = (qaddr_t)pmp;
1381 pmp->mp = mp;
1382
1383 /*
1384 * After pmp->mp is set we have to adjust hmp->mount_count.
1385 */
1386 cluster = &pmp->iroot->cluster;
1387 for (i = 0; i < cluster->nchains; ++i) {
1388 rchain = cluster->array[i].chain;
1389 if (rchain == NULL)
1390 continue;
1391 ++rchain->hmp->mount_count;
1392 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1393 rchain->hmp, rchain->hmp->mount_count);
1394 }
1395
1396 /*
1397 * Create missing Xop threads
1398 */
1399 hammer2_xop_helper_create(pmp);
1400 }
1401
1402 /*
1403 * Mount helper, unhook the system mount from our PFS.
1404 * The mount lock is held.
1405 *
1406 * If hmp is supplied a mount responsible for being the first to open
1407 * the block device failed and the block device and all PFSs using the
1408 * block device must be cleaned up.
1409 *
1410 * If pmp is supplied multiple devices might be backing the PFS and each
1411 * must be disconnected. This might not be the last PFS using some of the
1412 * underlying devices. Also, we have to adjust our hmp->mount_count
1413 * accounting for the devices backing the pmp which is now undergoing an
1414 * unmount.
1415 */
1416 static
1417 void
1418 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1419 {
1420 hammer2_cluster_t *cluster;
1421 hammer2_chain_t *rchain;
1422 struct vnode *devvp;
1423 int dumpcnt;
1424 int ronly = 0;
1425 int i;
1426
1427 /*
1428 * If no device supplied this is a high-level unmount and we have to
1429 * to disconnect the mount, adjust mount_count, and locate devices
1430 * that might now have no mounts.
1431 */
1432 if (pmp) {
1433 KKASSERT(hmp == NULL);
1434 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1435 pmp->mp = NULL;
1436 mp->mnt_data = NULL;
1437
1438 /*
1439 * After pmp->mp is cleared we have to account for
1440 * mount_count.
1441 */
1442 cluster = &pmp->iroot->cluster;
1443 for (i = 0; i < cluster->nchains; ++i) {
1444 rchain = cluster->array[i].chain;
1445 if (rchain == NULL)
1446 continue;
1447 --rchain->hmp->mount_count;
1448 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1449 rchain->hmp, rchain->hmp->mount_count);
1450 /* scrapping hmp now may invalidate the pmp */
1451 }
1452 again:
1453 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1454 if (hmp->mount_count == 0) {
1455 hammer2_unmount_helper(NULL, NULL, hmp);
1456 goto again;
1457 }
1458 }
1459 return;
1460 }
1461
1462 /*
1463 * Try to terminate the block device. We can't terminate it if
1464 * there are still PFSs referencing it.
1465 */
1466 kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1467 hmp, hmp->mount_count);
1468 if (hmp->mount_count)
1469 return;
1470
1471 hammer2_pfsfree_scan(hmp);
1472 hammer2_dev_exlock(hmp); /* XXX order */
1473
1474 /*
1475 * Cycle the volume data lock as a safety (probably not needed any
1476 * more). To ensure everything is out we need to flush at least
1477 * three times. (1) The running of the sideq can dirty the
1478 * filesystem, (2) A normal flush can dirty the freemap, and
1479 * (3) ensure that the freemap is fully synchronized.
1480 *
1481 * The next mount's recovery scan can clean everything up but we want
1482 * to leave the filesystem in a 100% clean state on a normal unmount.
1483 */
1484 #if 0
1485 hammer2_voldata_lock(hmp);
1486 hammer2_voldata_unlock(hmp);
1487 #endif
1488 hammer2_iocom_uninit(hmp);
1489
1490 if ((hmp->vchain.flags | hmp->fchain.flags) &
1491 HAMMER2_CHAIN_FLUSH_MASK) {
1492 kprintf("hammer2_unmount: chains left over "
1493 "after final sync\n");
1494 kprintf(" vchain %08x\n", hmp->vchain.flags);
1495 kprintf(" fchain %08x\n", hmp->fchain.flags);
1496
1497 if (hammer2_debug & 0x0010)
1498 Debugger("entered debugger");
1499 }
1500
1501 KKASSERT(hmp->spmp == NULL);
1502
1503 /*
1504 * Finish up with the device vnode
1505 */
1506 if ((devvp = hmp->devvp) != NULL) {
1507 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1508 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1509 hmp->devvp = NULL;
1510 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1511 vn_unlock(devvp);
1512 vrele(devvp);
1513 devvp = NULL;
1514 }
1515
1516 /*
1517 * Clear vchain/fchain flags that might prevent final cleanup
1518 * of these chains.
1519 */
1520 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1521 atomic_add_long(&hammer2_count_modified_chains, -1);
1522 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1523 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1524 }
1525 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1526 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1527 }
1528
1529 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1530 atomic_add_long(&hammer2_count_modified_chains, -1);
1531 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1532 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1533 }
1534 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1535 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1536 }
1537
1538 /*
1539 * Final drop of embedded freemap root chain to
1540 * clean up fchain.core (fchain structure is not
1541 * flagged ALLOCATED so it is cleaned out and then
1542 * left to rot).
1543 */
1544 hammer2_chain_drop(&hmp->fchain);
1545
1546 /*
1547 * Final drop of embedded volume root chain to clean
1548 * up vchain.core (vchain structure is not flagged
1549 * ALLOCATED so it is cleaned out and then left to
1550 * rot).
1551 */
1552 dumpcnt = 50;
1553 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1554 dumpcnt = 50;
1555 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1556 hammer2_dev_unlock(hmp);
1557 hammer2_chain_drop(&hmp->vchain);
1558
1559 hammer2_io_cleanup(hmp, &hmp->iotree);
1560 if (hmp->iofree_count) {
1561 kprintf("io_cleanup: %d I/O's left hanging\n",
1562 hmp->iofree_count);
1563 }
1564
1565 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1566 kmalloc_destroy(&hmp->mchain);
1567 kfree(hmp, M_HAMMER2);
1568 }
1569
1570 int
1571 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1572 ino_t ino, struct vnode **vpp)
1573 {
1574 hammer2_xop_lookup_t *xop;
1575 hammer2_pfs_t *pmp;
1576 hammer2_inode_t *ip;
1577 hammer2_tid_t inum;
1578 int error;
1579
1580 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1581
1582 error = 0;
1583 pmp = MPTOPMP(mp);
1584
1585 /*
1586 * Easy if we already have it cached
1587 */
1588 ip = hammer2_inode_lookup(pmp, inum);
1589 if (ip) {
1590 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1591 *vpp = hammer2_igetv(ip, &error);
1592 hammer2_inode_unlock(ip);
1593 hammer2_inode_drop(ip); /* from lookup */
1594
1595 return error;
1596 }
1597
1598 /*
1599 * Otherwise we have to find the inode
1600 */
1601 xop = hammer2_xop_alloc(pmp->iroot, 0);
1602 xop->lhc = inum;
1603 hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1604 error = hammer2_xop_collect(&xop->head, 0);
1605
1606 if (error == 0) {
1607 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1608 kprintf("vget: no collect error but also no rdata\n");
1609 kprintf("xop %p\n", xop);
1610 while ((hammer2_debug & 0x80000) == 0) {
1611 tsleep(xop, PCATCH, "wait", hz * 10);
1612 }
1613 ip = NULL;
1614 } else {
1615 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1616 }
1617 }
1618 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1619
1620 if (ip) {
1621 *vpp = hammer2_igetv(ip, &error);
1622 hammer2_inode_unlock(ip);
1623 } else {
1624 *vpp = NULL;
1625 error = ENOENT;
1626 }
1627 return (error);
1628 }
1629
1630 static
1631 int
1632 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1633 {
1634 hammer2_pfs_t *pmp;
1635 struct vnode *vp;
1636 int error;
1637
1638 pmp = MPTOPMP(mp);
1639 if (pmp->iroot == NULL) {
1640 *vpp = NULL;
1641 return EINVAL;
1642 }
1643
1644 error = 0;
1645 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1646
1647 while (pmp->inode_tid == 0) {
1648 hammer2_xop_ipcluster_t *xop;
1649 hammer2_inode_meta_t *meta;
1650
1651 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1652 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1653 error = hammer2_xop_collect(&xop->head, 0);
1654
1655 if (error == 0) {
1656 meta = &xop->head.cluster.focus->data->ipdata.meta;
1657 pmp->iroot->meta = *meta;
1658 pmp->inode_tid = meta->pfs_inum + 1;
1659 if (pmp->inode_tid < HAMMER2_INODE_START)
1660 pmp->inode_tid = HAMMER2_INODE_START;
1661 pmp->modify_tid =
1662 xop->head.cluster.focus->bref.modify_tid + 1;
1663 kprintf("PFS: Starting inode %jd\n",
1664 (intmax_t)pmp->inode_tid);
1665 kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1666 pmp->inode_tid, pmp->modify_tid);
1667 wakeup(&pmp->iroot);
1668
1669 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1670
1671 /*
1672 * Prime the mount info.
1673 */
1674 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1675 break;
1676 }
1677
1678 /*
1679 * Loop, try again
1680 */
1681 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1682 hammer2_inode_unlock(pmp->iroot);
1683 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1684 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1685 if (error == EINTR)
1686 break;
1687 }
1688
1689 if (error) {
1690 hammer2_inode_unlock(pmp->iroot);
1691 *vpp = NULL;
1692 } else {
1693 vp = hammer2_igetv(pmp->iroot, &error);
1694 hammer2_inode_unlock(pmp->iroot);
1695 *vpp = vp;
1696 }
1697
1698 return (error);
1699 }
1700
1701 /*
1702 * Filesystem status
1703 *
1704 * XXX incorporate ipdata->meta.inode_quota and data_quota
1705 */
1706 static
1707 int
1708 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1709 {
1710 hammer2_pfs_t *pmp;
1711 hammer2_dev_t *hmp;
1712 hammer2_blockref_t bref;
1713 int i;
1714
1715 /*
1716 * NOTE: iroot might not have validated the cluster yet.
1717 */
1718 pmp = MPTOPMP(mp);
1719
1720 mp->mnt_stat.f_files = 0;
1721 mp->mnt_stat.f_ffree = 0;
1722 mp->mnt_stat.f_blocks = 0;
1723 mp->mnt_stat.f_bfree = 0;
1724 mp->mnt_stat.f_bavail = 0;
1725
1726 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1727 hmp = pmp->pfs_hmps[i];
1728 if (hmp == NULL)
1729 continue;
1730 if (pmp->iroot->cluster.array[i].chain)
1731 bref = pmp->iroot->cluster.array[i].chain->bref;
1732 else
1733 bzero(&bref, sizeof(bref));
1734
1735 mp->mnt_stat.f_files = bref.inode_count;
1736 mp->mnt_stat.f_ffree = 0;
1737 #if 0
1738 mp->mnt_stat.f_blocks = (bref.data_count +
1739 hmp->voldata.allocator_free) /
1740 mp->mnt_vstat.f_bsize;
1741 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free /
1742 mp->mnt_vstat.f_bsize;
1743 #endif
1744 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size /
1745 mp->mnt_vstat.f_bsize;
1746 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free /
1747 mp->mnt_vstat.f_bsize;
1748 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1749
1750 *sbp = mp->mnt_stat;
1751 }
1752 return (0);
1753 }
1754
1755 static
1756 int
1757 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1758 {
1759 hammer2_pfs_t *pmp;
1760 hammer2_dev_t *hmp;
1761 hammer2_blockref_t bref;
1762 int i;
1763
1764 /*
1765 * NOTE: iroot might not have validated the cluster yet.
1766 */
1767 pmp = MPTOPMP(mp);
1768
1769 mp->mnt_vstat.f_bsize = 0;
1770 mp->mnt_vstat.f_files = 0;
1771 mp->mnt_vstat.f_ffree = 0;
1772 mp->mnt_vstat.f_blocks = 0;
1773 mp->mnt_vstat.f_bfree = 0;
1774 mp->mnt_vstat.f_bavail = 0;
1775
1776 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1777 hmp = pmp->pfs_hmps[i];
1778 if (hmp == NULL)
1779 continue;
1780 if (pmp->iroot->cluster.array[i].chain)
1781 bref = pmp->iroot->cluster.array[i].chain->bref;
1782 else
1783 bzero(&bref, sizeof(bref));
1784
1785 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1786 mp->mnt_vstat.f_files = bref.inode_count;
1787 mp->mnt_vstat.f_ffree = 0;
1788 #if 0
1789 mp->mnt_vstat.f_blocks = (bref.data_count +
1790 hmp->voldata.allocator_free) /
1791 mp->mnt_vstat.f_bsize;
1792 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1793 mp->mnt_vstat.f_bsize;
1794 #endif
1795 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size /
1796 mp->mnt_vstat.f_bsize;
1797 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1798 mp->mnt_vstat.f_bsize;
1799 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1800
1801 *sbp = mp->mnt_vstat;
1802 }
1803 return (0);
1804 }
1805
1806 /*
1807 * Mount-time recovery (RW mounts)
1808 *
1809 * Updates to the free block table are allowed to lag flushes by one
1810 * transaction. In case of a crash, then on a fresh mount we must do an
1811 * incremental scan of the last committed transaction id and make sure that
1812 * all related blocks have been marked allocated.
1813 *
1814 * The super-root topology and each PFS has its own transaction id domain,
1815 * so we must track PFS boundary transitions.
1816 */
1817 struct hammer2_recovery_elm {
1818 TAILQ_ENTRY(hammer2_recovery_elm) entry;
1819 hammer2_chain_t *chain;
1820 hammer2_tid_t sync_tid;
1821 };
1822
1823 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1824
1825 struct hammer2_recovery_info {
1826 struct hammer2_recovery_list list;
1827 hammer2_tid_t mtid;
1828 int depth;
1829 };
1830
1831 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
1832 hammer2_chain_t *parent,
1833 struct hammer2_recovery_info *info,
1834 hammer2_tid_t sync_tid);
1835
1836 #define HAMMER2_RECOVERY_MAXDEPTH 10
1837
1838 static
1839 int
1840 hammer2_recovery(hammer2_dev_t *hmp)
1841 {
1842 struct hammer2_recovery_info info;
1843 struct hammer2_recovery_elm *elm;
1844 hammer2_chain_t *parent;
1845 hammer2_tid_t sync_tid;
1846 hammer2_tid_t mirror_tid;
1847 int error;
1848 int cumulative_error = 0;
1849
1850 hammer2_trans_init(hmp->spmp, 0);
1851
1852 sync_tid = hmp->voldata.freemap_tid;
1853 mirror_tid = hmp->voldata.mirror_tid;
1854
1855 kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
1856 if (sync_tid >= mirror_tid) {
1857 kprintf(" no recovery needed\n");
1858 } else {
1859 kprintf(" freemap recovery %016jx-%016jx\n",
1860 sync_tid + 1, mirror_tid);
1861 }
1862
1863 TAILQ_INIT(&info.list);
1864 info.depth = 0;
1865 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1866 cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
1867 hammer2_chain_lookup_done(parent);
1868
1869 while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
1870 TAILQ_REMOVE(&info.list, elm, entry);
1871 parent = elm->chain;
1872 sync_tid = elm->sync_tid;
1873 kfree(elm, M_HAMMER2);
1874
1875 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1876 error = hammer2_recovery_scan(hmp, parent, &info,
1877 hmp->voldata.freemap_tid);
1878 hammer2_chain_unlock(parent);
1879 hammer2_chain_drop(parent); /* drop elm->chain ref */
1880 if (error)
1881 cumulative_error = error;
1882 }
1883 hammer2_trans_done(hmp->spmp);
1884
1885 return cumulative_error;
1886 }
1887
1888 static
1889 int
1890 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
1891 struct hammer2_recovery_info *info,
1892 hammer2_tid_t sync_tid)
1893 {
1894 const hammer2_inode_data_t *ripdata;
1895 hammer2_chain_t *chain;
1896 hammer2_blockref_t bref;
1897 int cache_index;
1898 int cumulative_error = 0;
1899 int error;
1900 int first;
1901
1902 /*
1903 * Adjust freemap to ensure that the block(s) are marked allocated.
1904 */
1905 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
1906 hammer2_freemap_adjust(hmp, &parent->bref,
1907 HAMMER2_FREEMAP_DORECOVER);
1908 }
1909
1910 /*
1911 * Check type for recursive scan
1912 */
1913 switch(parent->bref.type) {
1914 case HAMMER2_BREF_TYPE_VOLUME:
1915 /* data already instantiated */
1916 break;
1917 case HAMMER2_BREF_TYPE_INODE:
1918 /*
1919 * Must instantiate data for DIRECTDATA test and also
1920 * for recursion.
1921 */
1922 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1923 ripdata = &hammer2_chain_rdata(parent)->ipdata;
1924 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
1925 /* not applicable to recovery scan */
1926 hammer2_chain_unlock(parent);
1927 return 0;
1928 }
1929 hammer2_chain_unlock(parent);
1930 break;
1931 case HAMMER2_BREF_TYPE_INDIRECT:
1932 /*
1933 * Must instantiate data for recursion
1934 */
1935 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
1936 hammer2_chain_unlock(parent);
1937 break;
1938 case HAMMER2_BREF_TYPE_DATA:
1939 case HAMMER2_BREF_TYPE_FREEMAP:
1940 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
1941 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
1942 /* not applicable to recovery scan */
1943 return 0;
1944 break;
1945 default:
1946 return EDOM;
1947 }
1948
1949 /*
1950 * Defer operation if depth limit reached or if we are crossing a
1951 * PFS boundary.
1952 */
1953 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
1954 struct hammer2_recovery_elm *elm;
1955
1956 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
1957 elm->chain = parent;
1958 elm->sync_tid = sync_tid;
1959 hammer2_chain_ref(parent);
1960 TAILQ_INSERT_TAIL(&info->list, elm, entry);
1961 /* unlocked by caller */
1962
1963 return(0);
1964 }
1965
1966
1967 /*
1968 * Recursive scan of the last flushed transaction only. We are
1969 * doing this without pmp assignments so don't leave the chains
1970 * hanging around after we are done with them.
1971 */
1972 cache_index = 0;
1973 chain = NULL;
1974 first = 1;
1975
1976 while (hammer2_chain_scan(parent, &chain, &bref,
1977 &first, &cache_index,
1978 HAMMER2_LOOKUP_NODATA) != NULL) {
1979 /*
1980 * If this is a leaf
1981 */
1982 if (chain == NULL) {
1983 if (bref.mirror_tid > sync_tid) {
1984 hammer2_freemap_adjust(hmp, &bref,
1985 HAMMER2_FREEMAP_DORECOVER);
1986 }
1987 continue;
1988 }
1989
1990 /*
1991 * This may or may not be a recursive node.
1992 */
1993 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
1994 if (bref.mirror_tid > sync_tid) {
1995 ++info->depth;
1996 error = hammer2_recovery_scan(hmp, chain,
1997 info, sync_tid);
1998 --info->depth;
1999 if (error)
2000 cumulative_error = error;
2001 }
2002
2003 /*
2004 * Flush the recovery at the PFS boundary to stage it for
2005 * the final flush of the super-root topology.
2006 */
2007 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2008 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2009 hammer2_flush(chain, HAMMER2_FLUSH_TOP);
2010 }
2011 }
2012
2013 return cumulative_error;
2014 }
2015
2016 /*
2017 * Sync a mount point; this is called on a per-mount basis from the
2018 * filesystem syncer process periodically and whenever a user issues
2019 * a sync.
2020 */
2021 int
2022 hammer2_vfs_sync(struct mount *mp, int waitfor)
2023 {
2024 hammer2_xop_flush_t *xop;
2025 struct hammer2_sync_info info;
2026 hammer2_inode_t *iroot;
2027 hammer2_pfs_t *pmp;
2028 int flags;
2029 int error;
2030
2031 pmp = MPTOPMP(mp);
2032 iroot = pmp->iroot;
2033 KKASSERT(iroot);
2034 KKASSERT(iroot->pmp == pmp);
2035
2036 /*
2037 * We can't acquire locks on existing vnodes while in a transaction
2038 * without risking a deadlock. This assumes that vfsync() can be
2039 * called without the vnode locked (which it can in DragonFly).
2040 * Otherwise we'd have to implement a multi-pass or flag the lock
2041 * failures and retry.
2042 *
2043 * The reclamation code interlocks with the sync list's token
2044 * (by removing the vnode from the scan list) before unlocking
2045 * the inode, giving us time to ref the inode.
2046 */
2047 /*flags = VMSC_GETVP;*/
2048 flags = 0;
2049 if (waitfor & MNT_LAZY)
2050 flags |= VMSC_ONEPASS;
2051
2052 /*
2053 * Preflush the vnodes using a normal transaction before interlocking
2054 * with a flush transaction. We do this to try to run as much of
2055 * the compression as possible outside the flush transaction.
2056 *
2057 * For efficiency do an async pass before making sure with a
2058 * synchronous pass on all related buffer cache buffers.
2059 */
2060 hammer2_trans_init(pmp, 0);
2061 info.error = 0;
2062 info.waitfor = MNT_NOWAIT;
2063 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2064 info.waitfor = MNT_WAIT;
2065 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2066 hammer2_trans_done(pmp);
2067
2068 /*
2069 * Start our flush transaction. This does not return until all
2070 * concurrent transactions have completed and will prevent any
2071 * new transactions from running concurrently, except for the
2072 * buffer cache transactions.
2073 *
2074 * NOTE! It is still possible for the paging code to push pages
2075 * out via a UIO_NOCOPY hammer2_vop_write() during the main
2076 * flush.
2077 */
2078 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2079 hammer2_inode_run_sideq(pmp);
2080
2081 info.error = 0;
2082 info.waitfor = MNT_NOWAIT;
2083 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2084 info.waitfor = MNT_WAIT;
2085 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2086 hammer2_bioq_sync(pmp);
2087
2088 /*
2089 * Use the XOP interface to concurrently flush all nodes to
2090 * synchronize the PFSROOT subtopology to the media. A standard
2091 * end-of-scan ENOENT error indicates cluster sufficiency.
2092 *
2093 * Note that this flush will not be visible on crash recovery until
2094 * we flush the super-root topology in the next loop.
2095 *
2096 * XXX For now wait for all flushes to complete.
2097 */
2098 if (iroot) {
2099 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
2100 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2101 error = hammer2_xop_collect(&xop->head,
2102 HAMMER2_XOP_COLLECT_WAITALL);
2103 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2104 if (error == ENOENT)
2105 error = 0;
2106 } else {
2107 error = 0;
2108 }
2109 hammer2_trans_done(pmp);
2110
2111 return (error);
2112 }
2113
2114 /*
2115 * Sync passes.
2116 *
2117 * Note that we ignore the tranasction mtid we got above. Instead,
2118 * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2119 * transactions.
2120 */
2121 static int
2122 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2123 {
2124 struct hammer2_sync_info *info = data;
2125 hammer2_inode_t *ip;
2126 int error;
2127
2128 /*
2129 * Degenerate cases. Note that ip == NULL typically means the
2130 * syncer vnode itself and we don't want to vclrisdirty() in that
2131 * situation.
2132 */
2133 ip = VTOI(vp);
2134 if (ip == NULL) {
2135 return(0);
2136 }
2137 if (vp->v_type == VNON || vp->v_type == VBAD) {
2138 vclrisdirty(vp);
2139 return(0);
2140 }
2141
2142 /*
2143 * VOP_FSYNC will start a new transaction so replicate some code
2144 * here to do it inline (see hammer2_vop_fsync()).
2145 *
2146 * WARNING: The vfsync interacts with the buffer cache and might
2147 * block, we can't hold the inode lock at that time.
2148 * However, we MUST ref ip before blocking to ensure that
2149 * it isn't ripped out from under us (since we do not
2150 * hold a lock on the vnode).
2151 */
2152 hammer2_inode_ref(ip);
2153 if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2154 !RB_EMPTY(&vp->v_rbdirty_tree)) {
2155 vfsync(vp, info->waitfor, 1, NULL, NULL);
2156 if (ip->flags & (HAMMER2_INODE_RESIZED |
2157 HAMMER2_INODE_MODIFIED)) {
2158 hammer2_inode_lock(ip, 0);
2159 hammer2_inode_chain_sync(ip);
2160 hammer2_inode_unlock(ip);
2161 }
2162 }
2163 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2164 RB_EMPTY(&vp->v_rbdirty_tree)) {
2165 vclrisdirty(vp);
2166 }
2167
2168 hammer2_inode_drop(ip);
2169 #if 1
2170 error = 0;
2171 if (error)
2172 info->error = error;
2173 #endif
2174 return(0);
2175 }
2176
2177 static
2178 int
2179 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2180 {
2181 hammer2_inode_t *ip;
2182
2183 KKASSERT(MAXFIDSZ >= 16);
2184 ip = VTOI(vp);
2185 fhp->fid_len = offsetof(struct fid, fid_data[16]);
2186 fhp->fid_ext = 0;
2187 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2188 ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2189
2190 return 0;
2191 }
2192
2193 static
2194 int
2195 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2196 struct fid *fhp, struct vnode **vpp)
2197 {
2198 hammer2_pfs_t *pmp;
2199 hammer2_tid_t inum;
2200 int error;
2201
2202 pmp = MPTOPMP(mp);
2203 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2204 if (vpp) {
2205 if (inum == 1)
2206 error = hammer2_vfs_root(mp, vpp);
2207 else
2208 error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2209 } else {
2210 error = 0;
2211 }
2212 if (error)
2213 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2214 return error;
2215 }
2216
2217 static
2218 int
2219 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2220 int *exflagsp, struct ucred **credanonp)
2221 {
2222 hammer2_pfs_t *pmp;
2223 struct netcred *np;
2224 int error;
2225
2226 pmp = MPTOPMP(mp);
2227 np = vfs_export_lookup(mp, &pmp->export, nam);
2228 if (np) {
2229 *exflagsp = np->netc_exflags;
2230 *credanonp = &np->netc_anon;
2231 error = 0;
2232 } else {
2233 error = EACCES;
2234 }
2235 return error;
2236 }
2237
2238 /*
2239 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume
2240 * header into the HMP
2241 *
2242 * XXX read four volhdrs and use the one with the highest TID whos CRC
2243 * matches.
2244 *
2245 * XXX check iCRCs.
2246 *
2247 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2248 * nonexistant locations.
2249 *
2250 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2251 */
2252 static
2253 int
2254 hammer2_install_volume_header(hammer2_dev_t *hmp)
2255 {
2256 hammer2_volume_data_t *vd;
2257 struct buf *bp;
2258 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2259 int error_reported;
2260 int error;
2261 int valid;
2262 int i;
2263
2264 error_reported = 0;
2265 error = 0;
2266 valid = 0;
2267 bp = NULL;
2268
2269 /*
2270 * There are up to 4 copies of the volume header (syncs iterate
2271 * between them so there is no single master). We don't trust the
2272 * volu_size field so we don't know precisely how large the filesystem
2273 * is, so depend on the OS to return an error if we go beyond the
2274 * block device's EOF.
2275 */
2276 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2277 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2278 HAMMER2_VOLUME_BYTES, &bp);
2279 if (error) {
2280 brelse(bp);
2281 bp = NULL;
2282 continue;
2283 }
2284
2285 vd = (struct hammer2_volume_data *) bp->b_data;
2286 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2287 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2288 brelse(bp);
2289 bp = NULL;
2290 continue;
2291 }
2292
2293 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2294 /* XXX: Reversed-endianness filesystem */
2295 kprintf("hammer2: reverse-endian filesystem detected");
2296 brelse(bp);
2297 bp = NULL;
2298 continue;
2299 }
2300
2301 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2302 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2303 HAMMER2_VOLUME_ICRC0_SIZE);
2304 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2305 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2306 HAMMER2_VOLUME_ICRC1_SIZE);
2307 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2308 kprintf("hammer2 volume header crc "
2309 "mismatch copy #%d %08x/%08x\n",
2310 i, crc0, crc);
2311 error_reported = 1;
2312 brelse(bp);
2313 bp = NULL;
2314 continue;
2315 }
2316 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2317 valid = 1;
2318 hmp->voldata = *vd;
2319 hmp->volhdrno = i;
2320 }
2321 brelse(bp);
2322 bp = NULL;
2323 }
2324 if (valid) {
2325 hmp->volsync = hmp->voldata;
2326 error = 0;
2327 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2328 kprintf("hammer2: using volume header #%d\n",
2329 hmp->volhdrno);
2330 }
2331 } else {
2332 error = EINVAL;
2333 kprintf("hammer2: no valid volume headers found!\n");
2334 }
2335 return (error);
2336 }
2337
2338 /*
2339 * This handles hysteresis on regular file flushes. Because the BIOs are
2340 * routed to a thread it is possible for an excessive number to build up
2341 * and cause long front-end stalls long before the runningbuffspace limit
2342 * is hit, so we implement hammer2_flush_pipe to control the
2343 * hysteresis.
2344 *
2345 * This is a particular problem when compression is used.
2346 */
2347 void
2348 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2349 {
2350 atomic_add_int(&pmp->count_lwinprog, 1);
2351 }
2352
2353 void
2354 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2355 {
2356 int lwinprog;
2357
2358 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2359 if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2360 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2361 atomic_clear_int(&pmp->count_lwinprog,
2362 HAMMER2_LWINPROG_WAITING);
2363 wakeup(&pmp->count_lwinprog);
2364 }
2365 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2366 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2367 atomic_clear_int(&pmp->count_lwinprog,
2368 HAMMER2_LWINPROG_WAITING0);
2369 wakeup(&pmp->count_lwinprog);
2370 }
2371 }
2372
2373 void
2374 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2375 {
2376 int lwinprog;
2377 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2378 HAMMER2_LWINPROG_WAITING0;
2379
2380 for (;;) {
2381 lwinprog = pmp->count_lwinprog;
2382 cpu_ccfence();
2383 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2384 break;
2385 tsleep_interlock(&pmp->count_lwinprog, 0);
2386 atomic_set_int(&pmp->count_lwinprog, lwflag);
2387 lwinprog = pmp->count_lwinprog;
2388 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2389 break;
2390 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2391 }
2392 }
2393
2394 /*
2395 * Manage excessive memory resource use for chain and related
2396 * structures.
2397 */
2398 void
2399 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2400 {
2401 uint32_t waiting;
2402 uint32_t count;
2403 uint32_t limit;
2404 #if 0
2405 static int zzticks;
2406 #endif
2407
2408 /*
2409 * Atomic check condition and wait. Also do an early speedup of
2410 * the syncer to try to avoid hitting the wait.
2411 */
2412 for (;;) {
2413 waiting = pmp->inmem_dirty_chains;
2414 cpu_ccfence();
2415 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2416
2417 limit = pmp->mp->mnt_nvnodelistsize / 10;
2418 if (limit < hammer2_limit_dirty_chains)
2419 limit = hammer2_limit_dirty_chains;
2420 if (limit < 1000)
2421 limit = 1000;
2422
2423 #if 0
2424 if ((int)(ticks - zzticks) > hz) {
2425 zzticks = ticks;
2426 kprintf("count %ld %ld\n", count, limit);
2427 }
2428 #endif
2429
2430 /*
2431 * Block if there are too many dirty chains present, wait
2432 * for the flush to clean some out.
2433 */
2434 if (count > limit) {
2435 tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2436 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2437 waiting,
2438 waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2439 speedup_syncer(pmp->mp);
2440 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2441 "chnmem", hz);
2442 }
2443 continue; /* loop on success or fail */
2444 }
2445
2446 /*
2447 * Try to start an early flush before we are forced to block.
2448 */
2449 if (count > limit * 7 / 10)
2450 speedup_syncer(pmp->mp);
2451 break;
2452 }
2453 }
2454
2455 void
2456 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2457 {
2458 if (pmp) {
2459 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2460 }
2461 }
2462
2463 void
2464 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2465 {
2466 uint32_t waiting;
2467
2468 if (pmp == NULL)
2469 return;
2470
2471 for (;;) {
2472 waiting = pmp->inmem_dirty_chains;
2473 cpu_ccfence();
2474 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2475 waiting,
2476 (waiting - 1) &
2477 ~HAMMER2_DIRTYCHAIN_WAITING)) {
2478 break;
2479 }
2480 }
2481
2482 if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2483 wakeup(&pmp->inmem_dirty_chains);
2484 }
2485
2486 /*
2487 * Debugging
2488 */
2489 void
2490 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2491 {
2492 hammer2_chain_t *scan;
2493 hammer2_chain_t *parent;
2494
2495 --*countp;
2496 if (*countp == 0) {
2497 kprintf("%*.*s...\n", tab, tab, "");
2498 return;
2499 }
2500 if (*countp < 0)
2501 return;
2502 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2503 tab, tab, "", pfx,
2504 chain, chain->bref.type,
2505 chain->bref.key, chain->bref.keybits,
2506 chain->bref.mirror_tid);
2507
2508 kprintf("%*.*s [%08x] (%s) refs=%d",
2509 tab, tab, "",
2510 chain->flags,
2511 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2512 chain->data) ? (char *)chain->data->ipdata.filename : "?"),
2513 chain->refs);
2514
2515 parent = chain->parent;
2516 if (parent)
2517 kprintf("\n%*.*s p=%p [pflags %08x prefs %d",
2518 tab, tab, "",
2519 parent, parent->flags, parent->refs);
2520 if (RB_EMPTY(&chain->core.rbtree)) {
2521 kprintf("\n");
2522 } else {
2523 kprintf(" {\n");
2524 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2525 hammer2_dump_chain(scan, tab + 4, countp, 'a');
2526 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2527 kprintf("%*.*s}(%s)\n", tab, tab, "",
2528 chain->data->ipdata.filename);
2529 else
2530 kprintf("%*.*s}\n", tab, tab, "");
2531 }
2532 }
DragonFly BSD