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hammer2 - error handling 1/N (chain_scan)
[dragonfly.git] / sys / vfs / hammer2 / hammer2_vfsops.c
blob74b70a293ca712c80c73ac5058e69b6096723bfd
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 static struct hammer2_mntlist hammer2_mntlist;
76
77 struct hammer2_pfslist hammer2_pfslist;
78 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_always_compress = 0; /* always try to compress */
85 int hammer2_inval_enable = 0;
86 int hammer2_flush_pipe = 100;
87 int hammer2_synchronous_flush = 1;
88 int hammer2_dio_count;
89 int hammer2_limit_dio = 256;
90 long hammer2_chain_allocs;
91 long hammer2_chain_frees;
92 long hammer2_limit_dirty_chains;
93 long hammer2_count_modified_chains;
94 long hammer2_iod_invals;
95 long hammer2_iod_file_read;
96 long hammer2_iod_meta_read;
97 long hammer2_iod_indr_read;
98 long hammer2_iod_fmap_read;
99 long hammer2_iod_volu_read;
100 long hammer2_iod_file_write;
101 long hammer2_iod_file_wembed;
102 long hammer2_iod_file_wzero;
103 long hammer2_iod_file_wdedup;
104 long hammer2_iod_meta_write;
105 long hammer2_iod_indr_write;
106 long hammer2_iod_fmap_write;
107 long hammer2_iod_volu_write;
108
109 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
110 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
111 "Buffer used for compression.");
112
113 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
114 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
115 "Buffer used for decompression.");
116
117 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
118
119 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
120 &hammer2_debug, 0, "");
121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_read, CTLFLAG_RW,
122 &hammer2_cluster_read, 0, "");
123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW,
124 &hammer2_cluster_write, 0, "");
125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
126 &hammer2_dedup_enable, 0, "");
127 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
128 &hammer2_always_compress, 0, "");
129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
130 &hammer2_inval_enable, 0, "");
131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
132 &hammer2_flush_pipe, 0, "");
133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, synchronous_flush, CTLFLAG_RW,
134 &hammer2_synchronous_flush, 0, "");
135 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
136 &hammer2_chain_allocs, 0, "");
137 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
138 &hammer2_chain_frees, 0, "");
139 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
140 &hammer2_limit_dirty_chains, 0, "");
141 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
142 &hammer2_count_modified_chains, 0, "");
143 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
144 &hammer2_dio_count, 0, "");
145 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_dio, CTLFLAG_RW,
146 &hammer2_limit_dio, 0, "");
147
148 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
149 &hammer2_iod_invals, 0, "");
150 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
151 &hammer2_iod_file_read, 0, "");
152 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
153 &hammer2_iod_meta_read, 0, "");
154 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
155 &hammer2_iod_indr_read, 0, "");
156 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
157 &hammer2_iod_fmap_read, 0, "");
158 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
159 &hammer2_iod_volu_read, 0, "");
160
161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
162 &hammer2_iod_file_write, 0, "");
163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
164 &hammer2_iod_file_wembed, 0, "");
165 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
166 &hammer2_iod_file_wzero, 0, "");
167 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
168 &hammer2_iod_file_wdedup, 0, "");
169 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
170 &hammer2_iod_meta_write, 0, "");
171 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
172 &hammer2_iod_indr_write, 0, "");
173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
174 &hammer2_iod_fmap_write, 0, "");
175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
176 &hammer2_iod_volu_write, 0, "");
177
178 long hammer2_check_icrc32;
179 long hammer2_check_xxhash64;
180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_icrc32, CTLFLAG_RW,
181 &hammer2_check_icrc32, 0, "");
182 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, check_xxhash64, CTLFLAG_RW,
183 &hammer2_check_xxhash64, 0, "");
184
185 static int hammer2_vfs_init(struct vfsconf *conf);
186 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
187 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
188 struct ucred *cred);
189 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
190 struct vnode *, struct ucred *);
191 static int hammer2_recovery(hammer2_dev_t *hmp);
192 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
193 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
194 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
195 struct ucred *cred);
196 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
197 struct ucred *cred);
198 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
199 struct fid *fhp, struct vnode **vpp);
200 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
201 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
202 int *exflagsp, struct ucred **credanonp);
203
204 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
205 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
206
207 static void hammer2_update_pmps(hammer2_dev_t *hmp);
208
209 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
210 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
211 hammer2_dev_t *hmp);
212
213 /*
214 * HAMMER2 vfs operations.
215 */
216 static struct vfsops hammer2_vfsops = {
217 .vfs_init = hammer2_vfs_init,
218 .vfs_uninit = hammer2_vfs_uninit,
219 .vfs_sync = hammer2_vfs_sync,
220 .vfs_mount = hammer2_vfs_mount,
221 .vfs_unmount = hammer2_vfs_unmount,
222 .vfs_root = hammer2_vfs_root,
223 .vfs_statfs = hammer2_vfs_statfs,
224 .vfs_statvfs = hammer2_vfs_statvfs,
225 .vfs_vget = hammer2_vfs_vget,
226 .vfs_vptofh = hammer2_vfs_vptofh,
227 .vfs_fhtovp = hammer2_vfs_fhtovp,
228 .vfs_checkexp = hammer2_vfs_checkexp
229 };
230
231 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
232
233 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
234 MODULE_VERSION(hammer2, 1);
235
236 static
237 int
238 hammer2_vfs_init(struct vfsconf *conf)
239 {
240 static struct objcache_malloc_args margs_read;
241 static struct objcache_malloc_args margs_write;
242 static struct objcache_malloc_args margs_vop;
243
244 int error;
245
246 error = 0;
247
248 /*
249 * A large DIO cache is needed to retain dedup enablement masks.
250 * The bulkfree code clears related masks as part of the disk block
251 * recycling algorithm, preventing it from being used for a later
252 * dedup.
253 *
254 * NOTE: A large buffer cache can actually interfere with dedup
255 * operation because we dedup based on media physical buffers
256 * and not logical buffers. Try to make the DIO chace large
257 * enough to avoid this problem, but also cap it.
258 */
259 hammer2_limit_dio = nbuf * 2;
260 if (hammer2_limit_dio > 100000)
261 hammer2_limit_dio = 100000;
262
263 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
264 error = EINVAL;
265 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
266 error = EINVAL;
267 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
268 error = EINVAL;
269
270 if (error)
271 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
272
273 margs_read.objsize = 65536;
274 margs_read.mtype = M_HAMMER2_DEBUFFER;
275
276 margs_write.objsize = 32768;
277 margs_write.mtype = M_HAMMER2_CBUFFER;
278
279 margs_vop.objsize = sizeof(hammer2_xop_t);
280 margs_vop.mtype = M_HAMMER2;
281
282 /*
283 * Note thaht for the XOPS cache we want backing store allocations
284 * to use M_ZERO. This is not allowed in objcache_get() (to avoid
285 * confusion), so use the backing store function that does it. This
286 * means that initial XOPS objects are zerod but REUSED objects are
287 * not. So we are responsible for cleaning the object up sufficiently
288 * for our needs before objcache_put()ing it back (typically just the
289 * FIFO indices).
290 */
291 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
292 0, 1, NULL, NULL, NULL,
293 objcache_malloc_alloc,
294 objcache_malloc_free,
295 &margs_read);
296 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
297 0, 1, NULL, NULL, NULL,
298 objcache_malloc_alloc,
299 objcache_malloc_free,
300 &margs_write);
301 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
302 0, 1, NULL, NULL, NULL,
303 objcache_malloc_alloc_zero,
304 objcache_malloc_free,
305 &margs_vop);
306
307
308 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
309 TAILQ_INIT(&hammer2_mntlist);
310 TAILQ_INIT(&hammer2_pfslist);
311
312 hammer2_limit_dirty_chains = maxvnodes / 10;
313 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
314 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
315
316 return (error);
317 }
318
319 static
320 int
321 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
322 {
323 objcache_destroy(cache_buffer_read);
324 objcache_destroy(cache_buffer_write);
325 objcache_destroy(cache_xops);
326 return 0;
327 }
328
329 /*
330 * Core PFS allocator. Used to allocate or reference the pmp structure
331 * for PFS cluster mounts and the spmp structure for media (hmp) structures.
332 * The pmp can be passed in or loaded by this function using the chain and
333 * inode data.
334 *
335 * pmp->modify_tid tracks new modify_tid transaction ids for front-end
336 * transactions. Note that synchronization does not use this field.
337 * (typically frontend operations and synchronization cannot run on the
338 * same PFS node at the same time).
339 *
340 * XXX check locking
341 */
342 hammer2_pfs_t *
343 hammer2_pfsalloc(hammer2_chain_t *chain,
344 const hammer2_inode_data_t *ripdata,
345 hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
346 {
347 hammer2_pfs_t *pmp;
348 hammer2_inode_t *iroot;
349 int count;
350 int i;
351 int j;
352
353 pmp = NULL;
354
355 /*
356 * Locate or create the PFS based on the cluster id. If ripdata
357 * is NULL this is a spmp which is unique and is always allocated.
358 *
359 * If the device is mounted in local mode all PFSs are considered
360 * independent and not part of any cluster (for debugging only).
361 */
362 if (ripdata) {
363 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
364 if (force_local != pmp->force_local)
365 continue;
366 if (force_local == NULL &&
367 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
368 sizeof(pmp->pfs_clid)) == 0) {
369 break;
370 } else if (force_local && pmp->pfs_names[0] &&
371 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
372 break;
373 }
374 }
375 }
376
377 if (pmp == NULL) {
378 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
379 pmp->force_local = force_local;
380 hammer2_trans_manage_init(pmp);
381 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
382 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
383 lockinit(&pmp->lock, "pfslk", 0, 0);
384 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
385 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
386 spin_init(&pmp->xop_spin, "h2xop");
387 spin_init(&pmp->lru_spin, "h2lru");
388 RB_INIT(&pmp->inum_tree);
389 TAILQ_INIT(&pmp->sideq);
390 TAILQ_INIT(&pmp->lru_list);
391 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
392
393 /*
394 * Distribute backend operations to threads
395 */
396 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
397 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
398
399 /*
400 * Save the last media transaction id for the flusher. Set
401 * initial
402 */
403 if (ripdata)
404 pmp->pfs_clid = ripdata->meta.pfs_clid;
405 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
406
407 /*
408 * The synchronization thread may start too early, make
409 * sure it stays frozen until we are ready to let it go.
410 * XXX
411 */
412 /*
413 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
414 HAMMER2_THREAD_REMASTER;
415 */
416 }
417
418 /*
419 * Create the PFS's root inode and any missing XOP helper threads.
420 */
421 if ((iroot = pmp->iroot) == NULL) {
422 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
423 if (ripdata)
424 iroot->meta = ripdata->meta;
425 pmp->iroot = iroot;
426 hammer2_inode_ref(iroot);
427 hammer2_inode_unlock(iroot);
428 }
429
430 /*
431 * Stop here if no chain is passed in.
432 */
433 if (chain == NULL)
434 goto done;
435
436 /*
437 * When a chain is passed in we must add it to the PFS's root
438 * inode, update pmp->pfs_types[], and update the syncronization
439 * threads.
440 *
441 * When forcing local mode, mark the PFS as a MASTER regardless.
442 *
443 * At the moment empty spots can develop due to removals or failures.
444 * Ultimately we want to re-fill these spots but doing so might
445 * confused running code. XXX
446 */
447 hammer2_inode_ref(iroot);
448 hammer2_mtx_ex(&iroot->lock);
449 j = iroot->cluster.nchains;
450
451 kprintf("add PFS to pmp %p[%d]\n", pmp, j);
452
453 if (j == HAMMER2_MAXCLUSTER) {
454 kprintf("hammer2_mount: cluster full!\n");
455 /* XXX fatal error? */
456 } else {
457 KKASSERT(chain->pmp == NULL);
458 chain->pmp = pmp;
459 hammer2_chain_ref(chain);
460 iroot->cluster.array[j].chain = chain;
461 if (force_local)
462 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
463 else
464 pmp->pfs_types[j] = ripdata->meta.pfs_type;
465 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
466 pmp->pfs_hmps[j] = chain->hmp;
467
468 /*
469 * If the PFS is already mounted we must account
470 * for the mount_count here.
471 */
472 if (pmp->mp)
473 ++chain->hmp->mount_count;
474
475 /*
476 * May have to fixup dirty chain tracking. Previous
477 * pmp was NULL so nothing to undo.
478 */
479 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
480 hammer2_pfs_memory_inc(pmp);
481 ++j;
482 }
483 iroot->cluster.nchains = j;
484
485 /*
486 * Update nmasters from any PFS inode which is part of the cluster.
487 * It is possible that this will result in a value which is too
488 * high. MASTER PFSs are authoritative for pfs_nmasters and will
489 * override this value later on.
490 *
491 * (This informs us of masters that might not currently be
492 * discoverable by this mount).
493 */
494 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
495 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
496 }
497
498 /*
499 * Count visible masters. Masters are usually added with
500 * ripdata->meta.pfs_nmasters set to 1. This detects when there
501 * are more (XXX and must update the master inodes).
502 */
503 count = 0;
504 for (i = 0; i < iroot->cluster.nchains; ++i) {
505 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
506 ++count;
507 }
508 if (pmp->pfs_nmasters < count)
509 pmp->pfs_nmasters = count;
510
511 /*
512 * Create missing synchronization and support threads.
513 *
514 * Single-node masters (including snapshots) have nothing to
515 * synchronize and do not require this thread.
516 *
517 * Multi-node masters or any number of soft masters, slaves, copy,
518 * or other PFS types need the thread.
519 *
520 * Each thread is responsible for its particular cluster index.
521 * We use independent threads so stalls or mismatches related to
522 * any given target do not affect other targets.
523 */
524 for (i = 0; i < iroot->cluster.nchains; ++i) {
525 /*
526 * Single-node masters (including snapshots) have nothing
527 * to synchronize and will make direct xops support calls,
528 * thus they do not require this thread.
529 *
530 * Note that there can be thousands of snapshots. We do not
531 * want to create thousands of threads.
532 */
533 if (pmp->pfs_nmasters <= 1 &&
534 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
535 continue;
536 }
537
538 /*
539 * Sync support thread
540 */
541 if (pmp->sync_thrs[i].td == NULL) {
542 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
543 "h2nod", i, -1,
544 hammer2_primary_sync_thread);
545 }
546 }
547
548 /*
549 * Create missing Xop threads
550 *
551 * NOTE: We create helper threads for all mounted PFSs or any
552 * PFSs with 2+ nodes (so the sync thread can update them,
553 * even if not mounted).
554 */
555 if (pmp->mp || iroot->cluster.nchains >= 2)
556 hammer2_xop_helper_create(pmp);
557
558 hammer2_mtx_unlock(&iroot->lock);
559 hammer2_inode_drop(iroot);
560 done:
561 return pmp;
562 }
563
564 /*
565 * Deallocate an element of a probed PFS. If destroying and this is a
566 * MASTER, adjust nmasters.
567 *
568 * This function does not physically destroy the PFS element in its device
569 * under the super-root (see hammer2_ioctl_pfs_delete()).
570 */
571 void
572 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
573 {
574 hammer2_inode_t *iroot;
575 hammer2_chain_t *chain;
576 int j;
577
578 /*
579 * Cleanup our reference on iroot. iroot is (should) not be needed
580 * by the flush code.
581 */
582 iroot = pmp->iroot;
583 if (iroot) {
584 /*
585 * Stop synchronizing
586 *
587 * XXX flush after acquiring the iroot lock.
588 * XXX clean out the cluster index from all inode structures.
589 */
590 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
591
592 /*
593 * Remove the cluster index from the group. If destroying
594 * the PFS and this is a master, adjust pfs_nmasters.
595 */
596 hammer2_mtx_ex(&iroot->lock);
597 chain = iroot->cluster.array[clindex].chain;
598 iroot->cluster.array[clindex].chain = NULL;
599
600 switch(pmp->pfs_types[clindex]) {
601 case HAMMER2_PFSTYPE_MASTER:
602 if (destroying && pmp->pfs_nmasters > 0)
603 --pmp->pfs_nmasters;
604 /* XXX adjust ripdata->meta.pfs_nmasters */
605 break;
606 default:
607 break;
608 }
609 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
610
611 hammer2_mtx_unlock(&iroot->lock);
612
613 /*
614 * Release the chain.
615 */
616 if (chain) {
617 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
618 hammer2_chain_drop(chain);
619 }
620
621 /*
622 * Terminate all XOP threads for the cluster index.
623 */
624 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
625 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
626 }
627 }
628
629 /*
630 * Destroy a PFS, typically only occurs after the last mount on a device
631 * has gone away.
632 */
633 static void
634 hammer2_pfsfree(hammer2_pfs_t *pmp)
635 {
636 hammer2_inode_t *iroot;
637 hammer2_chain_t *chain;
638 int i;
639 int j;
640
641 /*
642 * Cleanup our reference on iroot. iroot is (should) not be needed
643 * by the flush code.
644 */
645 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
646
647 iroot = pmp->iroot;
648 if (iroot) {
649 for (i = 0; i < iroot->cluster.nchains; ++i) {
650 hammer2_thr_delete(&pmp->sync_thrs[i]);
651 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
652 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
653 }
654 #if REPORT_REFS_ERRORS
655 if (pmp->iroot->refs != 1)
656 kprintf("PMP->IROOT %p REFS WRONG %d\n",
657 pmp->iroot, pmp->iroot->refs);
658 #else
659 KKASSERT(pmp->iroot->refs == 1);
660 #endif
661 /* ref for pmp->iroot */
662 hammer2_inode_drop(pmp->iroot);
663 pmp->iroot = NULL;
664 }
665
666 /*
667 * Cleanup chains remaining on LRU list.
668 */
669 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count);
670 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
671 hammer2_chain_ref(chain);
672 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
673 hammer2_chain_drop(chain);
674 }
675
676 /*
677 * Free remaining pmp resources
678 */
679 kmalloc_destroy(&pmp->mmsg);
680 kmalloc_destroy(&pmp->minode);
681
682 kfree(pmp, M_HAMMER2);
683 }
684
685 /*
686 * Remove all references to hmp from the pfs list. Any PFS which becomes
687 * empty is terminated and freed.
688 *
689 * XXX inefficient.
690 */
691 static void
692 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
693 {
694 hammer2_pfs_t *pmp;
695 hammer2_inode_t *iroot;
696 hammer2_chain_t *rchain;
697 int didfreeze;
698 int i;
699 int j;
700
701 again:
702 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
703 if ((iroot = pmp->iroot) == NULL)
704 continue;
705 if (hmp->spmp == pmp) {
706 kprintf("unmount hmp %p remove spmp %p\n",
707 hmp, pmp);
708 hmp->spmp = NULL;
709 }
710
711 /*
712 * Determine if this PFS is affected. If it is we must
713 * freeze all management threads and lock its iroot.
714 *
715 * Freezing a management thread forces it idle, operations
716 * in-progress will be aborted and it will have to start
717 * over again when unfrozen, or exit if told to exit.
718 */
719 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
720 if (pmp->pfs_hmps[i] == hmp)
721 break;
722 }
723 if (i != HAMMER2_MAXCLUSTER) {
724 /*
725 * Make sure all synchronization threads are locked
726 * down.
727 */
728 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
729 if (pmp->pfs_hmps[i] == NULL)
730 continue;
731 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
732 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
733 hammer2_thr_freeze_async(
734 &pmp->xop_groups[j].thrs[i]);
735 }
736 }
737 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
738 if (pmp->pfs_hmps[i] == NULL)
739 continue;
740 hammer2_thr_freeze(&pmp->sync_thrs[i]);
741 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
742 hammer2_thr_freeze(
743 &pmp->xop_groups[j].thrs[i]);
744 }
745 }
746
747 /*
748 * Lock the inode and clean out matching chains.
749 * Note that we cannot use hammer2_inode_lock_*()
750 * here because that would attempt to validate the
751 * cluster that we are in the middle of ripping
752 * apart.
753 *
754 * WARNING! We are working directly on the inodes
755 * embedded cluster.
756 */
757 hammer2_mtx_ex(&iroot->lock);
758
759 /*
760 * Remove the chain from matching elements of the PFS.
761 */
762 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
763 if (pmp->pfs_hmps[i] != hmp)
764 continue;
765 hammer2_thr_delete(&pmp->sync_thrs[i]);
766 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
767 hammer2_thr_delete(
768 &pmp->xop_groups[j].thrs[i]);
769 }
770 rchain = iroot->cluster.array[i].chain;
771 iroot->cluster.array[i].chain = NULL;
772 pmp->pfs_types[i] = 0;
773 if (pmp->pfs_names[i]) {
774 kfree(pmp->pfs_names[i], M_HAMMER2);
775 pmp->pfs_names[i] = NULL;
776 }
777 if (rchain) {
778 hammer2_chain_drop(rchain);
779 /* focus hint */
780 if (iroot->cluster.focus == rchain)
781 iroot->cluster.focus = NULL;
782 }
783 pmp->pfs_hmps[i] = NULL;
784 }
785 hammer2_mtx_unlock(&iroot->lock);
786 didfreeze = 1; /* remaster, unfreeze down below */
787 } else {
788 didfreeze = 0;
789 }
790
791 /*
792 * Cleanup trailing chains. Gaps may remain.
793 */
794 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
795 if (pmp->pfs_hmps[i])
796 break;
797 }
798 iroot->cluster.nchains = i + 1;
799
800 /*
801 * If the PMP has no elements remaining we can destroy it.
802 * (this will transition management threads from frozen->exit).
803 */
804 if (iroot->cluster.nchains == 0) {
805 kprintf("unmount hmp %p last ref to PMP=%p\n",
806 hmp, pmp);
807 hammer2_pfsfree(pmp);
808 goto again;
809 }
810
811 /*
812 * If elements still remain we need to set the REMASTER
813 * flag and unfreeze it.
814 */
815 if (didfreeze) {
816 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
817 if (pmp->pfs_hmps[i] == NULL)
818 continue;
819 hammer2_thr_remaster(&pmp->sync_thrs[i]);
820 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
821 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
822 hammer2_thr_remaster(
823 &pmp->xop_groups[j].thrs[i]);
824 hammer2_thr_unfreeze(
825 &pmp->xop_groups[j].thrs[i]);
826 }
827 }
828 }
829 }
830 }
831
832 /*
833 * Mount or remount HAMMER2 fileystem from physical media
834 *
835 * mountroot
836 * mp mount point structure
837 * path NULL
838 * data <unused>
839 * cred <unused>
840 *
841 * mount
842 * mp mount point structure
843 * path path to mount point
844 * data pointer to argument structure in user space
845 * volume volume path (device@LABEL form)
846 * hflags user mount flags
847 * cred user credentials
848 *
849 * RETURNS: 0 Success
850 * !0 error number
851 */
852 static
853 int
854 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
855 struct ucred *cred)
856 {
857 struct hammer2_mount_info info;
858 hammer2_pfs_t *pmp;
859 hammer2_pfs_t *spmp;
860 hammer2_dev_t *hmp;
861 hammer2_dev_t *force_local;
862 hammer2_key_t key_next;
863 hammer2_key_t key_dummy;
864 hammer2_key_t lhc;
865 struct vnode *devvp;
866 struct nlookupdata nd;
867 hammer2_chain_t *parent;
868 hammer2_chain_t *chain;
869 hammer2_cluster_t *cluster;
870 const hammer2_inode_data_t *ripdata;
871 hammer2_blockref_t bref;
872 struct file *fp;
873 char devstr[MNAMELEN];
874 size_t size;
875 size_t done;
876 char *dev;
877 char *label;
878 int ronly = 1;
879 int error;
880 int cache_index;
881 int i;
882
883 hmp = NULL;
884 pmp = NULL;
885 dev = NULL;
886 label = NULL;
887 devvp = NULL;
888 cache_index = -1;
889
890 kprintf("hammer2_mount\n");
891
892 if (path == NULL) {
893 /*
894 * Root mount
895 */
896 bzero(&info, sizeof(info));
897 info.cluster_fd = -1;
898 ksnprintf(devstr, sizeof(devstr), "%s",
899 mp->mnt_stat.f_mntfromname);
900 kprintf("hammer2_mount: root '%s'\n", devstr);
901 } else {
902 /*
903 * Non-root mount or updating a mount
904 */
905 error = copyin(data, &info, sizeof(info));
906 if (error)
907 return (error);
908
909 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
910 if (error)
911 return (error);
912 }
913
914 /*
915 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
916 * if no label specified, based on the partition id. Error out if no
917 * partition id. This is strictly a convenience to match the
918 * default label created by newfs_hammer2, our preference is
919 * that a label always be specified.
920 */
921 dev = devstr;
922 label = strchr(devstr, '@');
923 if (label && ((label + 1) - dev) > done)
924 return (EINVAL);
925 if (label && label == devstr)
926 return (EINVAL);
927 if (label == NULL || label[1] == 0) {
928 char slice;
929
930 if (label == NULL)
931 label = devstr + strlen(devstr);
932 slice = label[-1];
933 switch(slice) {
934 case 'a':
935 label = "BOOT";
936 break;
937 case 'd':
938 label = "ROOT";
939 break;
940 default:
941 label = "DATA";
942 break;
943 }
944 } else {
945 *label = '\0';
946 label++;
947 }
948
949 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
950 dev, label, (mp->mnt_flag & MNT_RDONLY));
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 pmp = MPTOPMP(mp);
962 pmp->hflags = info.hflags;
963 cluster = &pmp->iroot->cluster;
964 for (i = 0; i < cluster->nchains; ++i) {
965 if (cluster->array[i].chain == NULL)
966 continue;
967 hmp = cluster->array[i].chain->hmp;
968 devvp = hmp->devvp;
969 error = hammer2_remount(hmp, mp, path,
970 devvp, cred);
971 if (error)
972 break;
973 }
974
975 return error;
976 }
977
978 /*
979 * HMP device mount
980 *
981 * If a path is specified and dev is not an empty string, lookup the
982 * name and verify that it referes to a block device.
983 *
984 * If a path is specified and dev is an empty string we fall through
985 * and locate the label in the hmp search.
986 */
987 if (path && *dev != 0) {
988 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
989 if (error == 0)
990 error = nlookup(&nd);
991 if (error == 0)
992 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
993 nlookup_done(&nd);
994 } else if (path == NULL) {
995 /* root mount */
996 cdev_t cdev = kgetdiskbyname(dev);
997 error = bdevvp(cdev, &devvp);
998 if (error)
999 kprintf("hammer2: cannot find '%s'\n", dev);
1000 } else {
1001 /*
1002 * We will locate the hmp using the label in the hmp loop.
1003 */
1004 error = 0;
1005 }
1006
1007 /*
1008 * Make sure its a block device. Do not check to see if it is
1009 * already mounted until we determine that its a fresh H2 device.
1010 */
1011 if (error == 0 && devvp) {
1012 vn_isdisk(devvp, &error);
1013 }
1014
1015 /*
1016 * Determine if the device has already been mounted. After this
1017 * check hmp will be non-NULL if we are doing the second or more
1018 * hammer2 mounts from the same device.
1019 */
1020 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1021 if (devvp) {
1022 /*
1023 * Match the device. Due to the way devfs works,
1024 * we may not be able to directly match the vnode pointer,
1025 * so also check to see if the underlying device matches.
1026 */
1027 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1028 if (hmp->devvp == devvp)
1029 break;
1030 if (devvp->v_rdev &&
1031 hmp->devvp->v_rdev == devvp->v_rdev) {
1032 break;
1033 }
1034 }
1035
1036 /*
1037 * If no match this may be a fresh H2 mount, make sure
1038 * the device is not mounted on anything else.
1039 */
1040 if (hmp == NULL)
1041 error = vfs_mountedon(devvp);
1042 } else if (error == 0) {
1043 /*
1044 * Match the label to a pmp already probed.
1045 */
1046 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1047 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1048 if (pmp->pfs_names[i] &&
1049 strcmp(pmp->pfs_names[i], label) == 0) {
1050 hmp = pmp->pfs_hmps[i];
1051 break;
1052 }
1053 }
1054 if (hmp)
1055 break;
1056 }
1057 if (hmp == NULL)
1058 error = ENOENT;
1059 }
1060
1061 /*
1062 * Open the device if this isn't a secondary mount and construct
1063 * the H2 device mount (hmp).
1064 */
1065 if (hmp == NULL) {
1066 hammer2_chain_t *schain;
1067 hammer2_xid_t xid;
1068
1069 if (error == 0 && vcount(devvp) > 0) {
1070 kprintf("Primary device already has references\n");
1071 error = EBUSY;
1072 }
1073
1074 /*
1075 * Now open the device
1076 */
1077 if (error == 0) {
1078 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1079 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1080 error = vinvalbuf(devvp, V_SAVE, 0, 0);
1081 if (error == 0) {
1082 error = VOP_OPEN(devvp,
1083 (ronly ? FREAD : FREAD | FWRITE),
1084 FSCRED, NULL);
1085 }
1086 vn_unlock(devvp);
1087 }
1088 if (error && devvp) {
1089 vrele(devvp);
1090 devvp = NULL;
1091 }
1092 if (error) {
1093 lockmgr(&hammer2_mntlk, LK_RELEASE);
1094 return error;
1095 }
1096 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1097 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1098 hmp->ronly = ronly;
1099 hmp->devvp = devvp;
1100 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1101 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1102 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1103 RB_INIT(&hmp->iotree);
1104 spin_init(&hmp->io_spin, "hm2mount_io");
1105 spin_init(&hmp->list_spin, "hm2mount_list");
1106 TAILQ_INIT(&hmp->flushq);
1107
1108 lockinit(&hmp->vollk, "h2vol", 0, 0);
1109 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1110 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1111
1112 /*
1113 * vchain setup. vchain.data is embedded.
1114 * vchain.refs is initialized and will never drop to 0.
1115 *
1116 * NOTE! voldata is not yet loaded.
1117 */
1118 hmp->vchain.hmp = hmp;
1119 hmp->vchain.refs = 1;
1120 hmp->vchain.data = (void *)&hmp->voldata;
1121 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1122 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1123 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1124
1125 hammer2_chain_core_init(&hmp->vchain);
1126 /* hmp->vchain.u.xxx is left NULL */
1127
1128 /*
1129 * fchain setup. fchain.data is embedded.
1130 * fchain.refs is initialized and will never drop to 0.
1131 *
1132 * The data is not used but needs to be initialized to
1133 * pass assertion muster. We use this chain primarily
1134 * as a placeholder for the freemap's top-level RBTREE
1135 * so it does not interfere with the volume's topology
1136 * RBTREE.
1137 */
1138 hmp->fchain.hmp = hmp;
1139 hmp->fchain.refs = 1;
1140 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1141 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1142 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1143 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1144 hmp->fchain.bref.methods =
1145 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1146 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1147
1148 hammer2_chain_core_init(&hmp->fchain);
1149 /* hmp->fchain.u.xxx is left NULL */
1150
1151 /*
1152 * Install the volume header and initialize fields from
1153 * voldata.
1154 */
1155 error = hammer2_install_volume_header(hmp);
1156 if (error) {
1157 hammer2_unmount_helper(mp, NULL, hmp);
1158 lockmgr(&hammer2_mntlk, LK_RELEASE);
1159 hammer2_vfs_unmount(mp, MNT_FORCE);
1160 return error;
1161 }
1162
1163 /*
1164 * Really important to get these right or flush will get
1165 * confused.
1166 */
1167 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1168 kprintf("alloc spmp %p tid %016jx\n",
1169 hmp->spmp, hmp->voldata.mirror_tid);
1170 spmp = hmp->spmp;
1171
1172 /*
1173 * Dummy-up vchain and fchain's modify_tid. mirror_tid
1174 * is inherited from the volume header.
1175 */
1176 xid = 0;
1177 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1178 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1179 hmp->vchain.pmp = spmp;
1180 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1181 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1182 hmp->fchain.pmp = spmp;
1183
1184 /*
1185 * First locate the super-root inode, which is key 0
1186 * relative to the volume header's blockset.
1187 *
1188 * Then locate the root inode by scanning the directory keyspace
1189 * represented by the label.
1190 */
1191 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1192 schain = hammer2_chain_lookup(&parent, &key_dummy,
1193 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1194 &cache_index, 0);
1195 hammer2_chain_lookup_done(parent);
1196 if (schain == NULL) {
1197 kprintf("hammer2_mount: invalid super-root\n");
1198 hammer2_unmount_helper(mp, NULL, hmp);
1199 lockmgr(&hammer2_mntlk, LK_RELEASE);
1200 hammer2_vfs_unmount(mp, MNT_FORCE);
1201 return EINVAL;
1202 }
1203 if (schain->error) {
1204 kprintf("hammer2_mount: error %s reading super-root\n",
1205 hammer2_error_str(schain->error));
1206 hammer2_chain_unlock(schain);
1207 hammer2_chain_drop(schain);
1208 schain = NULL;
1209 hammer2_unmount_helper(mp, NULL, hmp);
1210 lockmgr(&hammer2_mntlk, LK_RELEASE);
1211 hammer2_vfs_unmount(mp, MNT_FORCE);
1212 return EINVAL;
1213 }
1214
1215 /*
1216 * The super-root always uses an inode_tid of 1 when
1217 * creating PFSs.
1218 */
1219 spmp->inode_tid = 1;
1220 spmp->modify_tid = schain->bref.modify_tid + 1;
1221
1222 /*
1223 * Sanity-check schain's pmp and finish initialization.
1224 * Any chain belonging to the super-root topology should
1225 * have a NULL pmp (not even set to spmp).
1226 */
1227 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1228 KKASSERT(schain->pmp == NULL);
1229 spmp->pfs_clid = ripdata->meta.pfs_clid;
1230
1231 /*
1232 * Replace the dummy spmp->iroot with a real one. It's
1233 * easier to just do a wholesale replacement than to try
1234 * to update the chain and fixup the iroot fields.
1235 *
1236 * The returned inode is locked with the supplied cluster.
1237 */
1238 cluster = hammer2_cluster_from_chain(schain);
1239 hammer2_inode_drop(spmp->iroot);
1240 spmp->iroot = NULL;
1241 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1242 spmp->spmp_hmp = hmp;
1243 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1244 spmp->pfs_hmps[0] = hmp;
1245 hammer2_inode_ref(spmp->iroot);
1246 hammer2_inode_unlock(spmp->iroot);
1247 hammer2_cluster_unlock(cluster);
1248 hammer2_cluster_drop(cluster);
1249 schain = NULL;
1250 /* leave spmp->iroot with one ref */
1251
1252 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1253 error = hammer2_recovery(hmp);
1254 /* XXX do something with error */
1255 }
1256 hammer2_update_pmps(hmp);
1257 hammer2_iocom_init(hmp);
1258 hammer2_bulkfree_init(hmp);
1259
1260 /*
1261 * Ref the cluster management messaging descriptor. The mount
1262 * program deals with the other end of the communications pipe.
1263 *
1264 * Root mounts typically do not supply one.
1265 */
1266 if (info.cluster_fd >= 0) {
1267 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1268 if (fp) {
1269 hammer2_cluster_reconnect(hmp, fp);
1270 } else {
1271 kprintf("hammer2_mount: bad cluster_fd!\n");
1272 }
1273 }
1274 } else {
1275 spmp = hmp->spmp;
1276 if (info.hflags & HMNT2_DEVFLAGS) {
1277 kprintf("hammer2: Warning: mount flags pertaining "
1278 "to the whole device may only be specified "
1279 "on the first mount of the device: %08x\n",
1280 info.hflags & HMNT2_DEVFLAGS);
1281 }
1282 }
1283
1284 /*
1285 * Force local mount (disassociate all PFSs from their clusters).
1286 * Used primarily for debugging.
1287 */
1288 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1289
1290 /*
1291 * Lookup the mount point under the media-localized super-root.
1292 * Scanning hammer2_pfslist doesn't help us because it represents
1293 * PFS cluster ids which can aggregate several named PFSs together.
1294 *
1295 * cluster->pmp will incorrectly point to spmp and must be fixed
1296 * up later on.
1297 */
1298 hammer2_inode_lock(spmp->iroot, 0);
1299 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1300 lhc = hammer2_dirhash(label, strlen(label));
1301 chain = hammer2_chain_lookup(&parent, &key_next,
1302 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1303 &cache_index, 0);
1304 while (chain) {
1305 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1306 strcmp(label, chain->data->ipdata.filename) == 0) {
1307 break;
1308 }
1309 chain = hammer2_chain_next(&parent, chain, &key_next,
1310 key_next,
1311 lhc + HAMMER2_DIRHASH_LOMASK,
1312 &cache_index, 0);
1313 }
1314 if (parent) {
1315 hammer2_chain_unlock(parent);
1316 hammer2_chain_drop(parent);
1317 }
1318 hammer2_inode_unlock(spmp->iroot);
1319
1320 /*
1321 * PFS could not be found?
1322 */
1323 if (chain == NULL) {
1324 kprintf("hammer2_mount: PFS label not found\n");
1325 hammer2_unmount_helper(mp, NULL, hmp);
1326 lockmgr(&hammer2_mntlk, LK_RELEASE);
1327 hammer2_vfs_unmount(mp, MNT_FORCE);
1328
1329 return EINVAL;
1330 }
1331
1332 /*
1333 * Acquire the pmp structure (it should have already been allocated
1334 * via hammer2_update_pmps() so do not pass cluster in to add to
1335 * available chains).
1336 *
1337 * Check if the cluster has already been mounted. A cluster can
1338 * only be mounted once, use null mounts to mount additional copies.
1339 */
1340 ripdata = &chain->data->ipdata;
1341 bref = chain->bref;
1342 pmp = hammer2_pfsalloc(NULL, ripdata,
1343 bref.modify_tid, force_local);
1344 hammer2_chain_unlock(chain);
1345 hammer2_chain_drop(chain);
1346
1347 /*
1348 * Finish the mount
1349 */
1350 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1351
1352 if (pmp->mp) {
1353 kprintf("hammer2_mount: PFS already mounted!\n");
1354 hammer2_unmount_helper(mp, NULL, hmp);
1355 lockmgr(&hammer2_mntlk, LK_RELEASE);
1356 hammer2_vfs_unmount(mp, MNT_FORCE);
1357
1358 return EBUSY;
1359 }
1360
1361 pmp->hflags = info.hflags;
1362 mp->mnt_flag |= MNT_LOCAL;
1363 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
1364 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
1365
1366 /*
1367 * required mount structure initializations
1368 */
1369 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1370 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1371
1372 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1373 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1374
1375 /*
1376 * Optional fields
1377 */
1378 mp->mnt_iosize_max = MAXPHYS;
1379
1380 /*
1381 * Connect up mount pointers.
1382 */
1383 hammer2_mount_helper(mp, pmp);
1384
1385 lockmgr(&hammer2_mntlk, LK_RELEASE);
1386
1387 /*
1388 * Finish setup
1389 */
1390 vfs_getnewfsid(mp);
1391 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1392 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1393 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1394
1395 if (path) {
1396 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1397 MNAMELEN - 1, &size);
1398 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1399 } /* else root mount, already in there */
1400
1401 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1402 if (path) {
1403 copyinstr(path, mp->mnt_stat.f_mntonname,
1404 sizeof(mp->mnt_stat.f_mntonname) - 1,
1405 &size);
1406 } else {
1407 /* root mount */
1408 mp->mnt_stat.f_mntonname[0] = '/';
1409 }
1410
1411 /*
1412 * Initial statfs to prime mnt_stat.
1413 */
1414 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1415
1416 return 0;
1417 }
1418
1419 /*
1420 * Scan PFSs under the super-root and create hammer2_pfs structures.
1421 */
1422 static
1423 void
1424 hammer2_update_pmps(hammer2_dev_t *hmp)
1425 {
1426 const hammer2_inode_data_t *ripdata;
1427 hammer2_chain_t *parent;
1428 hammer2_chain_t *chain;
1429 hammer2_blockref_t bref;
1430 hammer2_dev_t *force_local;
1431 hammer2_pfs_t *spmp;
1432 hammer2_pfs_t *pmp;
1433 hammer2_key_t key_next;
1434 int cache_index = -1;
1435
1436 /*
1437 * Force local mount (disassociate all PFSs from their clusters).
1438 * Used primarily for debugging.
1439 */
1440 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1441
1442 /*
1443 * Lookup mount point under the media-localized super-root.
1444 *
1445 * cluster->pmp will incorrectly point to spmp and must be fixed
1446 * up later on.
1447 */
1448 spmp = hmp->spmp;
1449 hammer2_inode_lock(spmp->iroot, 0);
1450 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1451 chain = hammer2_chain_lookup(&parent, &key_next,
1452 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1453 &cache_index, 0);
1454 while (chain) {
1455 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1456 continue;
1457 ripdata = &chain->data->ipdata;
1458 bref = chain->bref;
1459 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1460
1461 pmp = hammer2_pfsalloc(chain, ripdata,
1462 bref.modify_tid, force_local);
1463 chain = hammer2_chain_next(&parent, chain, &key_next,
1464 key_next, HAMMER2_KEY_MAX,
1465 &cache_index, 0);
1466 }
1467 if (parent) {
1468 hammer2_chain_unlock(parent);
1469 hammer2_chain_drop(parent);
1470 }
1471 hammer2_inode_unlock(spmp->iroot);
1472 }
1473
1474 static
1475 int
1476 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1477 struct vnode *devvp, struct ucred *cred)
1478 {
1479 int error;
1480
1481 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1482 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1483 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1484 vn_unlock(devvp);
1485 error = hammer2_recovery(hmp);
1486 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1487 if (error == 0) {
1488 VOP_CLOSE(devvp, FREAD, NULL);
1489 hmp->ronly = 0;
1490 } else {
1491 VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1492 }
1493 vn_unlock(devvp);
1494 } else {
1495 error = 0;
1496 }
1497 return error;
1498 }
1499
1500 static
1501 int
1502 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1503 {
1504 hammer2_pfs_t *pmp;
1505 int flags;
1506 int error = 0;
1507
1508 pmp = MPTOPMP(mp);
1509
1510 if (pmp == NULL)
1511 return(0);
1512
1513 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1514
1515 /*
1516 * If mount initialization proceeded far enough we must flush
1517 * its vnodes and sync the underlying mount points. Three syncs
1518 * are required to fully flush the filesystem (freemap updates lag
1519 * by one flush, and one extra for safety).
1520 */
1521 if (mntflags & MNT_FORCE)
1522 flags = FORCECLOSE;
1523 else
1524 flags = 0;
1525 if (pmp->iroot) {
1526 error = vflush(mp, 0, flags);
1527 if (error)
1528 goto failed;
1529 hammer2_vfs_sync(mp, MNT_WAIT);
1530 hammer2_vfs_sync(mp, MNT_WAIT);
1531 hammer2_vfs_sync(mp, MNT_WAIT);
1532 }
1533
1534 /*
1535 * Cleanup the frontend support XOPS threads
1536 */
1537 hammer2_xop_helper_cleanup(pmp);
1538
1539 if (pmp->mp)
1540 hammer2_unmount_helper(mp, pmp, NULL);
1541
1542 error = 0;
1543 failed:
1544 lockmgr(&hammer2_mntlk, LK_RELEASE);
1545
1546 return (error);
1547 }
1548
1549 /*
1550 * Mount helper, hook the system mount into our PFS.
1551 * The mount lock is held.
1552 *
1553 * We must bump the mount_count on related devices for any
1554 * mounted PFSs.
1555 */
1556 static
1557 void
1558 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1559 {
1560 hammer2_cluster_t *cluster;
1561 hammer2_chain_t *rchain;
1562 int i;
1563
1564 mp->mnt_data = (qaddr_t)pmp;
1565 pmp->mp = mp;
1566
1567 /*
1568 * After pmp->mp is set we have to adjust hmp->mount_count.
1569 */
1570 cluster = &pmp->iroot->cluster;
1571 for (i = 0; i < cluster->nchains; ++i) {
1572 rchain = cluster->array[i].chain;
1573 if (rchain == NULL)
1574 continue;
1575 ++rchain->hmp->mount_count;
1576 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1577 rchain->hmp, rchain->hmp->mount_count);
1578 }
1579
1580 /*
1581 * Create missing Xop threads
1582 */
1583 hammer2_xop_helper_create(pmp);
1584 }
1585
1586 /*
1587 * Mount helper, unhook the system mount from our PFS.
1588 * The mount lock is held.
1589 *
1590 * If hmp is supplied a mount responsible for being the first to open
1591 * the block device failed and the block device and all PFSs using the
1592 * block device must be cleaned up.
1593 *
1594 * If pmp is supplied multiple devices might be backing the PFS and each
1595 * must be disconnected. This might not be the last PFS using some of the
1596 * underlying devices. Also, we have to adjust our hmp->mount_count
1597 * accounting for the devices backing the pmp which is now undergoing an
1598 * unmount.
1599 */
1600 static
1601 void
1602 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1603 {
1604 hammer2_cluster_t *cluster;
1605 hammer2_chain_t *rchain;
1606 struct vnode *devvp;
1607 int dumpcnt;
1608 int ronly;
1609 int i;
1610
1611 /*
1612 * If no device supplied this is a high-level unmount and we have to
1613 * to disconnect the mount, adjust mount_count, and locate devices
1614 * that might now have no mounts.
1615 */
1616 if (pmp) {
1617 KKASSERT(hmp == NULL);
1618 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1619 pmp->mp = NULL;
1620 mp->mnt_data = NULL;
1621
1622 /*
1623 * After pmp->mp is cleared we have to account for
1624 * mount_count.
1625 */
1626 cluster = &pmp->iroot->cluster;
1627 for (i = 0; i < cluster->nchains; ++i) {
1628 rchain = cluster->array[i].chain;
1629 if (rchain == NULL)
1630 continue;
1631 --rchain->hmp->mount_count;
1632 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1633 rchain->hmp, rchain->hmp->mount_count);
1634 /* scrapping hmp now may invalidate the pmp */
1635 }
1636 again:
1637 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1638 if (hmp->mount_count == 0) {
1639 hammer2_unmount_helper(NULL, NULL, hmp);
1640 goto again;
1641 }
1642 }
1643 return;
1644 }
1645
1646 /*
1647 * Try to terminate the block device. We can't terminate it if
1648 * there are still PFSs referencing it.
1649 */
1650 kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1651 hmp, hmp->mount_count);
1652 if (hmp->mount_count)
1653 return;
1654
1655 hammer2_bulkfree_uninit(hmp);
1656 hammer2_pfsfree_scan(hmp);
1657 hammer2_dev_exlock(hmp); /* XXX order */
1658
1659 /*
1660 * Cycle the volume data lock as a safety (probably not needed any
1661 * more). To ensure everything is out we need to flush at least
1662 * three times. (1) The running of the sideq can dirty the
1663 * filesystem, (2) A normal flush can dirty the freemap, and
1664 * (3) ensure that the freemap is fully synchronized.
1665 *
1666 * The next mount's recovery scan can clean everything up but we want
1667 * to leave the filesystem in a 100% clean state on a normal unmount.
1668 */
1669 #if 0
1670 hammer2_voldata_lock(hmp);
1671 hammer2_voldata_unlock(hmp);
1672 #endif
1673 hammer2_iocom_uninit(hmp);
1674
1675 if ((hmp->vchain.flags | hmp->fchain.flags) &
1676 HAMMER2_CHAIN_FLUSH_MASK) {
1677 kprintf("hammer2_unmount: chains left over "
1678 "after final sync\n");
1679 kprintf(" vchain %08x\n", hmp->vchain.flags);
1680 kprintf(" fchain %08x\n", hmp->fchain.flags);
1681
1682 if (hammer2_debug & 0x0010)
1683 Debugger("entered debugger");
1684 }
1685
1686 KKASSERT(hmp->spmp == NULL);
1687
1688 /*
1689 * Finish up with the device vnode
1690 */
1691 if ((devvp = hmp->devvp) != NULL) {
1692 ronly = hmp->ronly;
1693 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1694 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1695 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1696 ronly);
1697 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1698 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1699 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1700 hmp->devvp = NULL;
1701 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1702 vn_unlock(devvp);
1703 vrele(devvp);
1704 devvp = NULL;
1705 }
1706
1707 /*
1708 * Clear vchain/fchain flags that might prevent final cleanup
1709 * of these chains.
1710 */
1711 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1712 atomic_add_long(&hammer2_count_modified_chains, -1);
1713 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1714 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1715 }
1716 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1717 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1718 }
1719
1720 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1721 atomic_add_long(&hammer2_count_modified_chains, -1);
1722 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1723 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1724 }
1725 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1726 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1727 }
1728
1729 /*
1730 * Final drop of embedded freemap root chain to
1731 * clean up fchain.core (fchain structure is not
1732 * flagged ALLOCATED so it is cleaned out and then
1733 * left to rot).
1734 */
1735 hammer2_chain_drop(&hmp->fchain);
1736
1737 /*
1738 * Final drop of embedded volume root chain to clean
1739 * up vchain.core (vchain structure is not flagged
1740 * ALLOCATED so it is cleaned out and then left to
1741 * rot).
1742 */
1743 dumpcnt = 50;
1744 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1745 dumpcnt = 50;
1746 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1747 hammer2_dev_unlock(hmp);
1748 hammer2_chain_drop(&hmp->vchain);
1749
1750 hammer2_io_cleanup(hmp, &hmp->iotree);
1751 if (hmp->iofree_count) {
1752 kprintf("io_cleanup: %d I/O's left hanging\n",
1753 hmp->iofree_count);
1754 }
1755
1756 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1757 kmalloc_destroy(&hmp->mchain);
1758 kfree(hmp, M_HAMMER2);
1759 }
1760
1761 int
1762 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1763 ino_t ino, struct vnode **vpp)
1764 {
1765 hammer2_xop_lookup_t *xop;
1766 hammer2_pfs_t *pmp;
1767 hammer2_inode_t *ip;
1768 hammer2_tid_t inum;
1769 int error;
1770
1771 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1772
1773 error = 0;
1774 pmp = MPTOPMP(mp);
1775
1776 /*
1777 * Easy if we already have it cached
1778 */
1779 ip = hammer2_inode_lookup(pmp, inum);
1780 if (ip) {
1781 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1782 *vpp = hammer2_igetv(ip, &error);
1783 hammer2_inode_unlock(ip);
1784 hammer2_inode_drop(ip); /* from lookup */
1785
1786 return error;
1787 }
1788
1789 /*
1790 * Otherwise we have to find the inode
1791 */
1792 xop = hammer2_xop_alloc(pmp->iroot, 0);
1793 xop->lhc = inum;
1794 hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1795 error = hammer2_xop_collect(&xop->head, 0);
1796
1797 if (error == 0) {
1798 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1799 kprintf("vget: no collect error but also no rdata\n");
1800 kprintf("xop %p\n", xop);
1801 while ((hammer2_debug & 0x80000) == 0) {
1802 tsleep(xop, PCATCH, "wait", hz * 10);
1803 }
1804 ip = NULL;
1805 } else {
1806 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1807 }
1808 }
1809 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1810
1811 if (ip) {
1812 *vpp = hammer2_igetv(ip, &error);
1813 hammer2_inode_unlock(ip);
1814 } else {
1815 *vpp = NULL;
1816 error = ENOENT;
1817 }
1818 return (error);
1819 }
1820
1821 static
1822 int
1823 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1824 {
1825 hammer2_pfs_t *pmp;
1826 struct vnode *vp;
1827 int error;
1828
1829 pmp = MPTOPMP(mp);
1830 if (pmp->iroot == NULL) {
1831 *vpp = NULL;
1832 return EINVAL;
1833 }
1834
1835 error = 0;
1836 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1837
1838 while (pmp->inode_tid == 0) {
1839 hammer2_xop_ipcluster_t *xop;
1840 hammer2_inode_meta_t *meta;
1841
1842 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1843 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1844 error = hammer2_xop_collect(&xop->head, 0);
1845
1846 if (error == 0) {
1847 meta = &xop->head.cluster.focus->data->ipdata.meta;
1848 pmp->iroot->meta = *meta;
1849 pmp->inode_tid = meta->pfs_inum + 1;
1850 if (pmp->inode_tid < HAMMER2_INODE_START)
1851 pmp->inode_tid = HAMMER2_INODE_START;
1852 pmp->modify_tid =
1853 xop->head.cluster.focus->bref.modify_tid + 1;
1854 kprintf("PFS: Starting inode %jd\n",
1855 (intmax_t)pmp->inode_tid);
1856 kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1857 pmp->inode_tid, pmp->modify_tid);
1858 wakeup(&pmp->iroot);
1859
1860 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1861
1862 /*
1863 * Prime the mount info.
1864 */
1865 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1866 break;
1867 }
1868
1869 /*
1870 * Loop, try again
1871 */
1872 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1873 hammer2_inode_unlock(pmp->iroot);
1874 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1875 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1876 if (error == EINTR)
1877 break;
1878 }
1879
1880 if (error) {
1881 hammer2_inode_unlock(pmp->iroot);
1882 *vpp = NULL;
1883 } else {
1884 vp = hammer2_igetv(pmp->iroot, &error);
1885 hammer2_inode_unlock(pmp->iroot);
1886 *vpp = vp;
1887 }
1888
1889 return (error);
1890 }
1891
1892 /*
1893 * Filesystem status
1894 *
1895 * XXX incorporate ipdata->meta.inode_quota and data_quota
1896 */
1897 static
1898 int
1899 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1900 {
1901 hammer2_pfs_t *pmp;
1902 hammer2_dev_t *hmp;
1903 hammer2_blockref_t bref;
1904 int i;
1905
1906 /*
1907 * NOTE: iroot might not have validated the cluster yet.
1908 */
1909 pmp = MPTOPMP(mp);
1910
1911 mp->mnt_stat.f_files = 0;
1912 mp->mnt_stat.f_ffree = 0;
1913 mp->mnt_stat.f_blocks = 0;
1914 mp->mnt_stat.f_bfree = 0;
1915 mp->mnt_stat.f_bavail = 0;
1916
1917 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1918 hmp = pmp->pfs_hmps[i];
1919 if (hmp == NULL)
1920 continue;
1921 if (pmp->iroot->cluster.array[i].chain)
1922 bref = pmp->iroot->cluster.array[i].chain->bref;
1923 else
1924 bzero(&bref, sizeof(bref));
1925
1926 mp->mnt_stat.f_files = bref.embed.stats.inode_count;
1927 mp->mnt_stat.f_ffree = 0;
1928 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size /
1929 mp->mnt_vstat.f_bsize;
1930 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free /
1931 mp->mnt_vstat.f_bsize;
1932 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1933
1934 *sbp = mp->mnt_stat;
1935 }
1936 return (0);
1937 }
1938
1939 static
1940 int
1941 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1942 {
1943 hammer2_pfs_t *pmp;
1944 hammer2_dev_t *hmp;
1945 hammer2_blockref_t bref;
1946 int i;
1947
1948 /*
1949 * NOTE: iroot might not have validated the cluster yet.
1950 */
1951 pmp = MPTOPMP(mp);
1952
1953 mp->mnt_vstat.f_bsize = 0;
1954 mp->mnt_vstat.f_files = 0;
1955 mp->mnt_vstat.f_ffree = 0;
1956 mp->mnt_vstat.f_blocks = 0;
1957 mp->mnt_vstat.f_bfree = 0;
1958 mp->mnt_vstat.f_bavail = 0;
1959
1960 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1961 hmp = pmp->pfs_hmps[i];
1962 if (hmp == NULL)
1963 continue;
1964 if (pmp->iroot->cluster.array[i].chain)
1965 bref = pmp->iroot->cluster.array[i].chain->bref;
1966 else
1967 bzero(&bref, sizeof(bref));
1968
1969 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1970 mp->mnt_vstat.f_files = bref.embed.stats.inode_count;
1971 mp->mnt_vstat.f_ffree = 0;
1972 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size /
1973 mp->mnt_vstat.f_bsize;
1974 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1975 mp->mnt_vstat.f_bsize;
1976 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1977
1978 *sbp = mp->mnt_vstat;
1979 }
1980 return (0);
1981 }
1982
1983 /*
1984 * Mount-time recovery (RW mounts)
1985 *
1986 * Updates to the free block table are allowed to lag flushes by one
1987 * transaction. In case of a crash, then on a fresh mount we must do an
1988 * incremental scan of the last committed transaction id and make sure that
1989 * all related blocks have been marked allocated.
1990 *
1991 * The super-root topology and each PFS has its own transaction id domain,
1992 * so we must track PFS boundary transitions.
1993 */
1994 struct hammer2_recovery_elm {
1995 TAILQ_ENTRY(hammer2_recovery_elm) entry;
1996 hammer2_chain_t *chain;
1997 hammer2_tid_t sync_tid;
1998 };
1999
2000 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2001
2002 struct hammer2_recovery_info {
2003 struct hammer2_recovery_list list;
2004 hammer2_tid_t mtid;
2005 int depth;
2006 };
2007
2008 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2009 hammer2_chain_t *parent,
2010 struct hammer2_recovery_info *info,
2011 hammer2_tid_t sync_tid);
2012
2013 #define HAMMER2_RECOVERY_MAXDEPTH 10
2014
2015 static
2016 int
2017 hammer2_recovery(hammer2_dev_t *hmp)
2018 {
2019 struct hammer2_recovery_info info;
2020 struct hammer2_recovery_elm *elm;
2021 hammer2_chain_t *parent;
2022 hammer2_tid_t sync_tid;
2023 hammer2_tid_t mirror_tid;
2024 int error;
2025
2026 hammer2_trans_init(hmp->spmp, 0);
2027
2028 sync_tid = hmp->voldata.freemap_tid;
2029 mirror_tid = hmp->voldata.mirror_tid;
2030
2031 kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2032 if (sync_tid >= mirror_tid) {
2033 kprintf(" no recovery needed\n");
2034 } else {
2035 kprintf(" freemap recovery %016jx-%016jx\n",
2036 sync_tid + 1, mirror_tid);
2037 }
2038
2039 TAILQ_INIT(&info.list);
2040 info.depth = 0;
2041 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2042 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2043 hammer2_chain_lookup_done(parent);
2044
2045 while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2046 TAILQ_REMOVE(&info.list, elm, entry);
2047 parent = elm->chain;
2048 sync_tid = elm->sync_tid;
2049 kfree(elm, M_HAMMER2);
2050
2051 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2052 error |= hammer2_recovery_scan(hmp, parent, &info,
2053 hmp->voldata.freemap_tid);
2054 hammer2_chain_unlock(parent);
2055 hammer2_chain_drop(parent); /* drop elm->chain ref */
2056 }
2057 hammer2_trans_done(hmp->spmp);
2058
2059 return error;
2060 }
2061
2062 static
2063 int
2064 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2065 struct hammer2_recovery_info *info,
2066 hammer2_tid_t sync_tid)
2067 {
2068 const hammer2_inode_data_t *ripdata;
2069 hammer2_chain_t *chain;
2070 hammer2_blockref_t bref;
2071 int cache_index;
2072 int tmp_error;
2073 int rup_error;
2074 int error;
2075 int first;
2076
2077 /*
2078 * Adjust freemap to ensure that the block(s) are marked allocated.
2079 */
2080 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2081 hammer2_freemap_adjust(hmp, &parent->bref,
2082 HAMMER2_FREEMAP_DORECOVER);
2083 }
2084
2085 /*
2086 * Check type for recursive scan
2087 */
2088 switch(parent->bref.type) {
2089 case HAMMER2_BREF_TYPE_VOLUME:
2090 /* data already instantiated */
2091 break;
2092 case HAMMER2_BREF_TYPE_INODE:
2093 /*
2094 * Must instantiate data for DIRECTDATA test and also
2095 * for recursion.
2096 */
2097 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2098 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2099 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2100 /* not applicable to recovery scan */
2101 hammer2_chain_unlock(parent);
2102 return 0;
2103 }
2104 hammer2_chain_unlock(parent);
2105 break;
2106 case HAMMER2_BREF_TYPE_INDIRECT:
2107 /*
2108 * Must instantiate data for recursion
2109 */
2110 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2111 hammer2_chain_unlock(parent);
2112 break;
2113 case HAMMER2_BREF_TYPE_DIRENT:
2114 case HAMMER2_BREF_TYPE_DATA:
2115 case HAMMER2_BREF_TYPE_FREEMAP:
2116 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2117 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2118 /* not applicable to recovery scan */
2119 return 0;
2120 break;
2121 default:
2122 return HAMMER2_ERROR_BADBREF;
2123 }
2124
2125 /*
2126 * Defer operation if depth limit reached or if we are crossing a
2127 * PFS boundary.
2128 */
2129 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2130 struct hammer2_recovery_elm *elm;
2131
2132 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2133 elm->chain = parent;
2134 elm->sync_tid = sync_tid;
2135 hammer2_chain_ref(parent);
2136 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2137 /* unlocked by caller */
2138
2139 return(0);
2140 }
2141
2142
2143 /*
2144 * Recursive scan of the last flushed transaction only. We are
2145 * doing this without pmp assignments so don't leave the chains
2146 * hanging around after we are done with them.
2147 *
2148 * error Cumulative error this level only
2149 * rup_error Cumulative error for recursion
2150 * tmp_error Specific non-cumulative recursion error
2151 */
2152 cache_index = 0;
2153 chain = NULL;
2154 first = 1;
2155 rup_error = 0;
2156 error = 0;
2157
2158 for (;;) {
2159 error |= hammer2_chain_scan(parent, &chain, &bref,
2160 &first, &cache_index,
2161 HAMMER2_LOOKUP_NODATA);
2162
2163 /*
2164 * Problem during scan or EOF
2165 */
2166 if (error)
2167 break;
2168
2169 /*
2170 * If this is a leaf
2171 */
2172 if (chain == NULL) {
2173 if (bref.mirror_tid > sync_tid) {
2174 hammer2_freemap_adjust(hmp, &bref,
2175 HAMMER2_FREEMAP_DORECOVER);
2176 }
2177 continue;
2178 }
2179
2180 /*
2181 * This may or may not be a recursive node.
2182 */
2183 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2184 if (bref.mirror_tid > sync_tid) {
2185 ++info->depth;
2186 tmp_error = hammer2_recovery_scan(hmp, chain,
2187 info, sync_tid);
2188 --info->depth;
2189 } else {
2190 tmp_error = 0;
2191 }
2192
2193 /*
2194 * Flush the recovery at the PFS boundary to stage it for
2195 * the final flush of the super-root topology.
2196 */
2197 if (tmp_error == 0 &&
2198 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2199 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2200 hammer2_flush(chain, HAMMER2_FLUSH_TOP);
2201 }
2202 rup_error |= tmp_error;
2203 }
2204 return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2205 }
2206
2207 /*
2208 * Sync a mount point; this is called on a per-mount basis from the
2209 * filesystem syncer process periodically and whenever a user issues
2210 * a sync.
2211 */
2212 int
2213 hammer2_vfs_sync(struct mount *mp, int waitfor)
2214 {
2215 hammer2_xop_flush_t *xop;
2216 struct hammer2_sync_info info;
2217 hammer2_inode_t *iroot;
2218 hammer2_pfs_t *pmp;
2219 int flags;
2220 int error;
2221
2222 pmp = MPTOPMP(mp);
2223 iroot = pmp->iroot;
2224 KKASSERT(iroot);
2225 KKASSERT(iroot->pmp == pmp);
2226
2227 /*
2228 * We can't acquire locks on existing vnodes while in a transaction
2229 * without risking a deadlock. This assumes that vfsync() can be
2230 * called without the vnode locked (which it can in DragonFly).
2231 * Otherwise we'd have to implement a multi-pass or flag the lock
2232 * failures and retry.
2233 *
2234 * The reclamation code interlocks with the sync list's token
2235 * (by removing the vnode from the scan list) before unlocking
2236 * the inode, giving us time to ref the inode.
2237 */
2238 /*flags = VMSC_GETVP;*/
2239 flags = 0;
2240 if (waitfor & MNT_LAZY)
2241 flags |= VMSC_ONEPASS;
2242
2243 /*
2244 * Preflush the vnodes using a normal transaction before interlocking
2245 * with a flush transaction. We do this to try to run as much of
2246 * the compression as possible outside the flush transaction.
2247 *
2248 * For efficiency do an async pass before making sure with a
2249 * synchronous pass on all related buffer cache buffers.
2250 */
2251 hammer2_trans_init(pmp, 0);
2252 info.error = 0;
2253 info.waitfor = MNT_NOWAIT;
2254 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2255 info.waitfor = MNT_WAIT;
2256 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2257 hammer2_trans_done(pmp);
2258
2259 /*
2260 * Start our flush transaction. This does not return until all
2261 * concurrent transactions have completed and will prevent any
2262 * new transactions from running concurrently, except for the
2263 * buffer cache transactions.
2264 *
2265 * NOTE! It is still possible for the paging code to push pages
2266 * out via a UIO_NOCOPY hammer2_vop_write() during the main
2267 * flush.
2268 */
2269 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2270 hammer2_inode_run_sideq(pmp);
2271
2272 info.error = 0;
2273 info.waitfor = MNT_NOWAIT;
2274 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2275 info.waitfor = MNT_WAIT;
2276 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2277 hammer2_bioq_sync(pmp);
2278
2279 /*
2280 * Use the XOP interface to concurrently flush all nodes to
2281 * synchronize the PFSROOT subtopology to the media. A standard
2282 * end-of-scan ENOENT error indicates cluster sufficiency.
2283 *
2284 * Note that this flush will not be visible on crash recovery until
2285 * we flush the super-root topology in the next loop.
2286 *
2287 * XXX For now wait for all flushes to complete.
2288 */
2289 if (iroot) {
2290 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
2291 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2292 error = hammer2_xop_collect(&xop->head,
2293 HAMMER2_XOP_COLLECT_WAITALL);
2294 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2295 if (error == ENOENT)
2296 error = 0;
2297 } else {
2298 error = 0;
2299 }
2300 hammer2_trans_done(pmp);
2301
2302 return (error);
2303 }
2304
2305 /*
2306 * Sync passes.
2307 *
2308 * Note that we ignore the tranasction mtid we got above. Instead,
2309 * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2310 * transactions.
2311 */
2312 static int
2313 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2314 {
2315 struct hammer2_sync_info *info = data;
2316 hammer2_inode_t *ip;
2317 int error;
2318
2319 /*
2320 * Degenerate cases. Note that ip == NULL typically means the
2321 * syncer vnode itself and we don't want to vclrisdirty() in that
2322 * situation.
2323 */
2324 ip = VTOI(vp);
2325 if (ip == NULL) {
2326 return(0);
2327 }
2328 if (vp->v_type == VNON || vp->v_type == VBAD) {
2329 vclrisdirty(vp);
2330 return(0);
2331 }
2332
2333 /*
2334 * VOP_FSYNC will start a new transaction so replicate some code
2335 * here to do it inline (see hammer2_vop_fsync()).
2336 *
2337 * WARNING: The vfsync interacts with the buffer cache and might
2338 * block, we can't hold the inode lock at that time.
2339 * However, we MUST ref ip before blocking to ensure that
2340 * it isn't ripped out from under us (since we do not
2341 * hold a lock on the vnode).
2342 */
2343 hammer2_inode_ref(ip);
2344 if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2345 !RB_EMPTY(&vp->v_rbdirty_tree)) {
2346 vfsync(vp, info->waitfor, 1, NULL, NULL);
2347 if (ip->flags & (HAMMER2_INODE_RESIZED |
2348 HAMMER2_INODE_MODIFIED)) {
2349 hammer2_inode_lock(ip, 0);
2350 if (ip->flags & (HAMMER2_INODE_RESIZED |
2351 HAMMER2_INODE_MODIFIED)) {
2352 hammer2_inode_chain_sync(ip);
2353 }
2354 hammer2_inode_unlock(ip);
2355 }
2356 }
2357 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2358 RB_EMPTY(&vp->v_rbdirty_tree)) {
2359 vclrisdirty(vp);
2360 }
2361
2362 hammer2_inode_drop(ip);
2363 #if 1
2364 error = 0;
2365 if (error)
2366 info->error = error;
2367 #endif
2368 return(0);
2369 }
2370
2371 static
2372 int
2373 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2374 {
2375 hammer2_inode_t *ip;
2376
2377 KKASSERT(MAXFIDSZ >= 16);
2378 ip = VTOI(vp);
2379 fhp->fid_len = offsetof(struct fid, fid_data[16]);
2380 fhp->fid_ext = 0;
2381 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2382 ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2383
2384 return 0;
2385 }
2386
2387 static
2388 int
2389 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2390 struct fid *fhp, struct vnode **vpp)
2391 {
2392 hammer2_pfs_t *pmp;
2393 hammer2_tid_t inum;
2394 int error;
2395
2396 pmp = MPTOPMP(mp);
2397 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2398 if (vpp) {
2399 if (inum == 1)
2400 error = hammer2_vfs_root(mp, vpp);
2401 else
2402 error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2403 } else {
2404 error = 0;
2405 }
2406 if (error)
2407 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2408 return error;
2409 }
2410
2411 static
2412 int
2413 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2414 int *exflagsp, struct ucred **credanonp)
2415 {
2416 hammer2_pfs_t *pmp;
2417 struct netcred *np;
2418 int error;
2419
2420 pmp = MPTOPMP(mp);
2421 np = vfs_export_lookup(mp, &pmp->export, nam);
2422 if (np) {
2423 *exflagsp = np->netc_exflags;
2424 *credanonp = &np->netc_anon;
2425 error = 0;
2426 } else {
2427 error = EACCES;
2428 }
2429 return error;
2430 }
2431
2432 /*
2433 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume
2434 * header into the HMP
2435 *
2436 * XXX read four volhdrs and use the one with the highest TID whos CRC
2437 * matches.
2438 *
2439 * XXX check iCRCs.
2440 *
2441 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2442 * nonexistant locations.
2443 *
2444 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2445 */
2446 static
2447 int
2448 hammer2_install_volume_header(hammer2_dev_t *hmp)
2449 {
2450 hammer2_volume_data_t *vd;
2451 struct buf *bp;
2452 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2453 int error_reported;
2454 int error;
2455 int valid;
2456 int i;
2457
2458 error_reported = 0;
2459 error = 0;
2460 valid = 0;
2461 bp = NULL;
2462
2463 /*
2464 * There are up to 4 copies of the volume header (syncs iterate
2465 * between them so there is no single master). We don't trust the
2466 * volu_size field so we don't know precisely how large the filesystem
2467 * is, so depend on the OS to return an error if we go beyond the
2468 * block device's EOF.
2469 */
2470 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2471 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2472 HAMMER2_VOLUME_BYTES, &bp);
2473 if (error) {
2474 brelse(bp);
2475 bp = NULL;
2476 continue;
2477 }
2478
2479 vd = (struct hammer2_volume_data *) bp->b_data;
2480 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2481 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2482 brelse(bp);
2483 bp = NULL;
2484 continue;
2485 }
2486
2487 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2488 /* XXX: Reversed-endianness filesystem */
2489 kprintf("hammer2: reverse-endian filesystem detected");
2490 brelse(bp);
2491 bp = NULL;
2492 continue;
2493 }
2494
2495 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2496 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2497 HAMMER2_VOLUME_ICRC0_SIZE);
2498 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2499 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2500 HAMMER2_VOLUME_ICRC1_SIZE);
2501 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2502 kprintf("hammer2 volume header crc "
2503 "mismatch copy #%d %08x/%08x\n",
2504 i, crc0, crc);
2505 error_reported = 1;
2506 brelse(bp);
2507 bp = NULL;
2508 continue;
2509 }
2510 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2511 valid = 1;
2512 hmp->voldata = *vd;
2513 hmp->volhdrno = i;
2514 }
2515 brelse(bp);
2516 bp = NULL;
2517 }
2518 if (valid) {
2519 hmp->volsync = hmp->voldata;
2520 error = 0;
2521 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2522 kprintf("hammer2: using volume header #%d\n",
2523 hmp->volhdrno);
2524 }
2525 } else {
2526 error = EINVAL;
2527 kprintf("hammer2: no valid volume headers found!\n");
2528 }
2529 return (error);
2530 }
2531
2532 /*
2533 * This handles hysteresis on regular file flushes. Because the BIOs are
2534 * routed to a thread it is possible for an excessive number to build up
2535 * and cause long front-end stalls long before the runningbuffspace limit
2536 * is hit, so we implement hammer2_flush_pipe to control the
2537 * hysteresis.
2538 *
2539 * This is a particular problem when compression is used.
2540 */
2541 void
2542 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2543 {
2544 atomic_add_int(&pmp->count_lwinprog, 1);
2545 }
2546
2547 void
2548 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2549 {
2550 int lwinprog;
2551
2552 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2553 if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2554 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2555 atomic_clear_int(&pmp->count_lwinprog,
2556 HAMMER2_LWINPROG_WAITING);
2557 wakeup(&pmp->count_lwinprog);
2558 }
2559 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2560 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2561 atomic_clear_int(&pmp->count_lwinprog,
2562 HAMMER2_LWINPROG_WAITING0);
2563 wakeup(&pmp->count_lwinprog);
2564 }
2565 }
2566
2567 void
2568 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2569 {
2570 int lwinprog;
2571 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2572 HAMMER2_LWINPROG_WAITING0;
2573
2574 for (;;) {
2575 lwinprog = pmp->count_lwinprog;
2576 cpu_ccfence();
2577 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2578 break;
2579 tsleep_interlock(&pmp->count_lwinprog, 0);
2580 atomic_set_int(&pmp->count_lwinprog, lwflag);
2581 lwinprog = pmp->count_lwinprog;
2582 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2583 break;
2584 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2585 }
2586 }
2587
2588 /*
2589 * Manage excessive memory resource use for chain and related
2590 * structures.
2591 */
2592 void
2593 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2594 {
2595 uint32_t waiting;
2596 uint32_t count;
2597 uint32_t limit;
2598 #if 0
2599 static int zzticks;
2600 #endif
2601
2602 /*
2603 * Atomic check condition and wait. Also do an early speedup of
2604 * the syncer to try to avoid hitting the wait.
2605 */
2606 for (;;) {
2607 waiting = pmp->inmem_dirty_chains;
2608 cpu_ccfence();
2609 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2610
2611 limit = pmp->mp->mnt_nvnodelistsize / 10;
2612 if (limit < hammer2_limit_dirty_chains)
2613 limit = hammer2_limit_dirty_chains;
2614 if (limit < 1000)
2615 limit = 1000;
2616
2617 #if 0
2618 if ((int)(ticks - zzticks) > hz) {
2619 zzticks = ticks;
2620 kprintf("count %ld %ld\n", count, limit);
2621 }
2622 #endif
2623
2624 /*
2625 * Block if there are too many dirty chains present, wait
2626 * for the flush to clean some out.
2627 */
2628 if (count > limit) {
2629 tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2630 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2631 waiting,
2632 waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2633 speedup_syncer(pmp->mp);
2634 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2635 "chnmem", hz);
2636 }
2637 continue; /* loop on success or fail */
2638 }
2639
2640 /*
2641 * Try to start an early flush before we are forced to block.
2642 */
2643 if (count > limit * 7 / 10)
2644 speedup_syncer(pmp->mp);
2645 break;
2646 }
2647 }
2648
2649 void
2650 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2651 {
2652 if (pmp) {
2653 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2654 }
2655 }
2656
2657 void
2658 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2659 {
2660 uint32_t waiting;
2661
2662 if (pmp == NULL)
2663 return;
2664
2665 for (;;) {
2666 waiting = pmp->inmem_dirty_chains;
2667 cpu_ccfence();
2668 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2669 waiting,
2670 (waiting - 1) &
2671 ~HAMMER2_DIRTYCHAIN_WAITING)) {
2672 break;
2673 }
2674 }
2675
2676 if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2677 wakeup(&pmp->inmem_dirty_chains);
2678 }
2679
2680 /*
2681 * Debugging
2682 */
2683 void
2684 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2685 {
2686 hammer2_chain_t *scan;
2687 hammer2_chain_t *parent;
2688
2689 --*countp;
2690 if (*countp == 0) {
2691 kprintf("%*.*s...\n", tab, tab, "");
2692 return;
2693 }
2694 if (*countp < 0)
2695 return;
2696 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2697 tab, tab, "", pfx,
2698 chain, chain->bref.type,
2699 chain->bref.key, chain->bref.keybits,
2700 chain->bref.mirror_tid);
2701
2702 kprintf("%*.*s [%08x] (%s) refs=%d",
2703 tab, tab, "",
2704 chain->flags,
2705 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2706 chain->data) ? (char *)chain->data->ipdata.filename : "?"),
2707 chain->refs);
2708
2709 parent = chain->parent;
2710 if (parent)
2711 kprintf("\n%*.*s p=%p [pflags %08x prefs %d",
2712 tab, tab, "",
2713 parent, parent->flags, parent->refs);
2714 if (RB_EMPTY(&chain->core.rbtree)) {
2715 kprintf("\n");
2716 } else {
2717 kprintf(" {\n");
2718 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2719 hammer2_dump_chain(scan, tab + 4, countp, 'a');
2720 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2721 kprintf("%*.*s}(%s)\n", tab, tab, "",
2722 chain->data->ipdata.filename);
2723 else
2724 kprintf("%*.*s}\n", tab, tab, "");
2725 }
2726 }
DragonFly BSD