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hammer2 - Fix snapshots and multi-label mounts
[dragonfly.git] / sys / vfs / hammer2 / hammer2_vfsops.c
blobc0a834c4dde304366f85a4ead3be3e0befca9a07
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_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, VFCF_MPSAFE);
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 or reference the pmp structure
310 * for PFS cluster mounts and the spmp structure for media (hmp) structures.
311 * The pmp can be passed in or loaded by this function using the chain and
312 * inode data.
313 *
314 * pmp->modify_tid tracks new modify_tid transaction ids for front-end
315 * transactions. Note that synchronization does not use this field.
316 * (typically frontend operations and synchronization cannot run on the
317 * same PFS node at the same time).
318 *
319 * XXX check locking
320 */
321 hammer2_pfs_t *
322 hammer2_pfsalloc(hammer2_chain_t *chain,
323 const hammer2_inode_data_t *ripdata,
324 hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
325 {
326 hammer2_pfs_t *pmp;
327 hammer2_inode_t *iroot;
328 int count;
329 int i;
330 int j;
331
332 pmp = NULL;
333
334 /*
335 * Locate or create the PFS based on the cluster id. If ripdata
336 * is NULL this is a spmp which is unique and is always allocated.
337 *
338 * If the device is mounted in local mode all PFSs are considered
339 * independent and not part of any cluster (for debugging only).
340 */
341 if (ripdata) {
342 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
343 if (force_local != pmp->force_local)
344 continue;
345 if (force_local == NULL &&
346 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
347 sizeof(pmp->pfs_clid)) == 0) {
348 break;
349 } else if (force_local && pmp->pfs_names[0] &&
350 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
351 break;
352 }
353 }
354 }
355
356 if (pmp == NULL) {
357 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
358 pmp->force_local = force_local;
359 hammer2_trans_manage_init(pmp);
360 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
361 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
362 lockinit(&pmp->lock, "pfslk", 0, 0);
363 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
364 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
365 spin_init(&pmp->xop_spin, "h2xop");
366 spin_init(&pmp->lru_spin, "h2lru");
367 RB_INIT(&pmp->inum_tree);
368 TAILQ_INIT(&pmp->sideq);
369 TAILQ_INIT(&pmp->lru_list);
370 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
371
372 /*
373 * Distribute backend operations to threads
374 */
375 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
376 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
377
378 /*
379 * Save the last media transaction id for the flusher. Set
380 * initial
381 */
382 if (ripdata)
383 pmp->pfs_clid = ripdata->meta.pfs_clid;
384 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
385
386 /*
387 * The synchronization thread may start too early, make
388 * sure it stays frozen until we are ready to let it go.
389 * XXX
390 */
391 /*
392 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
393 HAMMER2_THREAD_REMASTER;
394 */
395 }
396
397 /*
398 * Create the PFS's root inode and any missing XOP helper threads.
399 */
400 if ((iroot = pmp->iroot) == NULL) {
401 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
402 if (ripdata)
403 iroot->meta = ripdata->meta;
404 pmp->iroot = iroot;
405 hammer2_inode_ref(iroot);
406 hammer2_inode_unlock(iroot);
407 }
408
409 /*
410 * Stop here if no chain is passed in.
411 */
412 if (chain == NULL)
413 goto done;
414
415 /*
416 * When a chain is passed in we must add it to the PFS's root
417 * inode, update pmp->pfs_types[], and update the syncronization
418 * threads.
419 *
420 * When forcing local mode, mark the PFS as a MASTER regardless.
421 *
422 * At the moment empty spots can develop due to removals or failures.
423 * Ultimately we want to re-fill these spots but doing so might
424 * confused running code. XXX
425 */
426 hammer2_inode_ref(iroot);
427 hammer2_mtx_ex(&iroot->lock);
428 j = iroot->cluster.nchains;
429
430 kprintf("add PFS to pmp %p[%d]\n", pmp, j);
431
432 if (j == HAMMER2_MAXCLUSTER) {
433 kprintf("hammer2_mount: cluster full!\n");
434 /* XXX fatal error? */
435 } else {
436 KKASSERT(chain->pmp == NULL);
437 chain->pmp = pmp;
438 hammer2_chain_ref(chain);
439 iroot->cluster.array[j].chain = chain;
440 if (force_local)
441 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
442 else
443 pmp->pfs_types[j] = ripdata->meta.pfs_type;
444 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
445 pmp->pfs_hmps[j] = chain->hmp;
446
447 /*
448 * If the PFS is already mounted we must account
449 * for the mount_count here.
450 */
451 if (pmp->mp)
452 ++chain->hmp->mount_count;
453
454 /*
455 * May have to fixup dirty chain tracking. Previous
456 * pmp was NULL so nothing to undo.
457 */
458 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
459 hammer2_pfs_memory_inc(pmp);
460 ++j;
461 }
462 iroot->cluster.nchains = j;
463
464 /*
465 * Update nmasters from any PFS inode which is part of the cluster.
466 * It is possible that this will result in a value which is too
467 * high. MASTER PFSs are authoritative for pfs_nmasters and will
468 * override this value later on.
469 *
470 * (This informs us of masters that might not currently be
471 * discoverable by this mount).
472 */
473 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
474 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
475 }
476
477 /*
478 * Count visible masters. Masters are usually added with
479 * ripdata->meta.pfs_nmasters set to 1. This detects when there
480 * are more (XXX and must update the master inodes).
481 */
482 count = 0;
483 for (i = 0; i < iroot->cluster.nchains; ++i) {
484 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
485 ++count;
486 }
487 if (pmp->pfs_nmasters < count)
488 pmp->pfs_nmasters = count;
489
490 /*
491 * Create missing synchronization and support threads.
492 *
493 * Single-node masters (including snapshots) have nothing to
494 * synchronize and do not require this thread.
495 *
496 * Multi-node masters or any number of soft masters, slaves, copy,
497 * or other PFS types need the thread.
498 *
499 * Each thread is responsible for its particular cluster index.
500 * We use independent threads so stalls or mismatches related to
501 * any given target do not affect other targets.
502 */
503 for (i = 0; i < iroot->cluster.nchains; ++i) {
504 /*
505 * Single-node masters (including snapshots) have nothing
506 * to synchronize and will make direct xops support calls,
507 * thus they do not require this thread.
508 *
509 * Note that there can be thousands of snapshots. We do not
510 * want to create thousands of threads.
511 */
512 if (pmp->pfs_nmasters <= 1 &&
513 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
514 continue;
515 }
516
517 /*
518 * Sync support thread
519 */
520 if (pmp->sync_thrs[i].td == NULL) {
521 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
522 "h2nod", i, -1,
523 hammer2_primary_sync_thread);
524 }
525 }
526
527 /*
528 * Create missing Xop threads
529 *
530 * NOTE: We create helper threads for all mounted PFSs or any
531 * PFSs with 2+ nodes (so the sync thread can update them,
532 * even if not mounted).
533 */
534 if (pmp->mp || iroot->cluster.nchains >= 2)
535 hammer2_xop_helper_create(pmp);
536
537 hammer2_mtx_unlock(&iroot->lock);
538 hammer2_inode_drop(iroot);
539 done:
540 return pmp;
541 }
542
543 /*
544 * Deallocate an element of a probed PFS. If destroying and this is a
545 * MASTER, adjust nmasters.
546 *
547 * This function does not physically destroy the PFS element in its device
548 * under the super-root (see hammer2_ioctl_pfs_delete()).
549 */
550 void
551 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
552 {
553 hammer2_inode_t *iroot;
554 hammer2_chain_t *chain;
555 int j;
556
557 /*
558 * Cleanup our reference on iroot. iroot is (should) not be needed
559 * by the flush code.
560 */
561 iroot = pmp->iroot;
562 if (iroot) {
563 /*
564 * Stop synchronizing
565 *
566 * XXX flush after acquiring the iroot lock.
567 * XXX clean out the cluster index from all inode structures.
568 */
569 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
570
571 /*
572 * Remove the cluster index from the group. If destroying
573 * the PFS and this is a master, adjust pfs_nmasters.
574 */
575 hammer2_mtx_ex(&iroot->lock);
576 chain = iroot->cluster.array[clindex].chain;
577 iroot->cluster.array[clindex].chain = NULL;
578
579 switch(pmp->pfs_types[clindex]) {
580 case HAMMER2_PFSTYPE_MASTER:
581 if (destroying && pmp->pfs_nmasters > 0)
582 --pmp->pfs_nmasters;
583 /* XXX adjust ripdata->meta.pfs_nmasters */
584 break;
585 default:
586 break;
587 }
588 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
589
590 hammer2_mtx_unlock(&iroot->lock);
591
592 /*
593 * Release the chain.
594 */
595 if (chain) {
596 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
597 hammer2_chain_drop(chain);
598 }
599
600 /*
601 * Terminate all XOP threads for the cluster index.
602 */
603 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
604 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
605 }
606 }
607
608 /*
609 * Destroy a PFS, typically only occurs after the last mount on a device
610 * has gone away.
611 */
612 static void
613 hammer2_pfsfree(hammer2_pfs_t *pmp)
614 {
615 hammer2_inode_t *iroot;
616 hammer2_chain_t *chain;
617 int i;
618 int j;
619
620 /*
621 * Cleanup our reference on iroot. iroot is (should) not be needed
622 * by the flush code.
623 */
624 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
625
626 iroot = pmp->iroot;
627 if (iroot) {
628 for (i = 0; i < iroot->cluster.nchains; ++i) {
629 hammer2_thr_delete(&pmp->sync_thrs[i]);
630 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
631 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
632 }
633 #if REPORT_REFS_ERRORS
634 if (pmp->iroot->refs != 1)
635 kprintf("PMP->IROOT %p REFS WRONG %d\n",
636 pmp->iroot, pmp->iroot->refs);
637 #else
638 KKASSERT(pmp->iroot->refs == 1);
639 #endif
640 /* ref for pmp->iroot */
641 hammer2_inode_drop(pmp->iroot);
642 pmp->iroot = NULL;
643 }
644
645 /*
646 * Cleanup chains remaining on LRU list.
647 */
648 kprintf("pfsfree: %p lrucount=%d\n", pmp, pmp->lru_count);
649 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
650 hammer2_chain_ref(chain);
651 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
652 hammer2_chain_drop(chain);
653 }
654
655 /*
656 * Free remaining pmp resources
657 */
658 kmalloc_destroy(&pmp->mmsg);
659 kmalloc_destroy(&pmp->minode);
660
661 kfree(pmp, M_HAMMER2);
662 }
663
664 /*
665 * Remove all references to hmp from the pfs list. Any PFS which becomes
666 * empty is terminated and freed.
667 *
668 * XXX inefficient.
669 */
670 static void
671 hammer2_pfsfree_scan(hammer2_dev_t *hmp)
672 {
673 hammer2_pfs_t *pmp;
674 hammer2_inode_t *iroot;
675 hammer2_chain_t *rchain;
676 int didfreeze;
677 int i;
678 int j;
679
680 again:
681 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
682 if ((iroot = pmp->iroot) == NULL)
683 continue;
684 if (hmp->spmp == pmp) {
685 kprintf("unmount hmp %p remove spmp %p\n",
686 hmp, pmp);
687 hmp->spmp = NULL;
688 }
689
690 /*
691 * Determine if this PFS is affected. If it is we must
692 * freeze all management threads and lock its iroot.
693 *
694 * Freezing a management thread forces it idle, operations
695 * in-progress will be aborted and it will have to start
696 * over again when unfrozen, or exit if told to exit.
697 */
698 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
699 if (pmp->pfs_hmps[i] == hmp)
700 break;
701 }
702 if (i != HAMMER2_MAXCLUSTER) {
703 /*
704 * Make sure all synchronization threads are locked
705 * down.
706 */
707 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
708 if (pmp->pfs_hmps[i] == NULL)
709 continue;
710 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
711 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
712 hammer2_thr_freeze_async(
713 &pmp->xop_groups[j].thrs[i]);
714 }
715 }
716 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
717 if (pmp->pfs_hmps[i] == NULL)
718 continue;
719 hammer2_thr_freeze(&pmp->sync_thrs[i]);
720 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
721 hammer2_thr_freeze(
722 &pmp->xop_groups[j].thrs[i]);
723 }
724 }
725
726 /*
727 * Lock the inode and clean out matching chains.
728 * Note that we cannot use hammer2_inode_lock_*()
729 * here because that would attempt to validate the
730 * cluster that we are in the middle of ripping
731 * apart.
732 *
733 * WARNING! We are working directly on the inodes
734 * embedded cluster.
735 */
736 hammer2_mtx_ex(&iroot->lock);
737
738 /*
739 * Remove the chain from matching elements of the PFS.
740 */
741 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
742 if (pmp->pfs_hmps[i] != hmp)
743 continue;
744 hammer2_thr_delete(&pmp->sync_thrs[i]);
745 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
746 hammer2_thr_delete(
747 &pmp->xop_groups[j].thrs[i]);
748 }
749 rchain = iroot->cluster.array[i].chain;
750 iroot->cluster.array[i].chain = NULL;
751 pmp->pfs_types[i] = 0;
752 if (pmp->pfs_names[i]) {
753 kfree(pmp->pfs_names[i], M_HAMMER2);
754 pmp->pfs_names[i] = NULL;
755 }
756 if (rchain) {
757 hammer2_chain_drop(rchain);
758 /* focus hint */
759 if (iroot->cluster.focus == rchain)
760 iroot->cluster.focus = NULL;
761 }
762 pmp->pfs_hmps[i] = NULL;
763 }
764 hammer2_mtx_unlock(&iroot->lock);
765 didfreeze = 1; /* remaster, unfreeze down below */
766 } else {
767 didfreeze = 0;
768 }
769
770 /*
771 * Cleanup trailing chains. Gaps may remain.
772 */
773 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
774 if (pmp->pfs_hmps[i])
775 break;
776 }
777 iroot->cluster.nchains = i + 1;
778
779 /*
780 * If the PMP has no elements remaining we can destroy it.
781 * (this will transition management threads from frozen->exit).
782 */
783 if (iroot->cluster.nchains == 0) {
784 kprintf("unmount hmp %p last ref to PMP=%p\n",
785 hmp, pmp);
786 hammer2_pfsfree(pmp);
787 goto again;
788 }
789
790 /*
791 * If elements still remain we need to set the REMASTER
792 * flag and unfreeze it.
793 */
794 if (didfreeze) {
795 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
796 if (pmp->pfs_hmps[i] == NULL)
797 continue;
798 hammer2_thr_remaster(&pmp->sync_thrs[i]);
799 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
800 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
801 hammer2_thr_remaster(
802 &pmp->xop_groups[j].thrs[i]);
803 hammer2_thr_unfreeze(
804 &pmp->xop_groups[j].thrs[i]);
805 }
806 }
807 }
808 }
809 }
810
811 /*
812 * Mount or remount HAMMER2 fileystem from physical media
813 *
814 * mountroot
815 * mp mount point structure
816 * path NULL
817 * data <unused>
818 * cred <unused>
819 *
820 * mount
821 * mp mount point structure
822 * path path to mount point
823 * data pointer to argument structure in user space
824 * volume volume path (device@LABEL form)
825 * hflags user mount flags
826 * cred user credentials
827 *
828 * RETURNS: 0 Success
829 * !0 error number
830 */
831 static
832 int
833 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
834 struct ucred *cred)
835 {
836 struct hammer2_mount_info info;
837 hammer2_pfs_t *pmp;
838 hammer2_pfs_t *spmp;
839 hammer2_dev_t *hmp;
840 hammer2_dev_t *force_local;
841 hammer2_key_t key_next;
842 hammer2_key_t key_dummy;
843 hammer2_key_t lhc;
844 struct vnode *devvp;
845 struct nlookupdata nd;
846 hammer2_chain_t *parent;
847 hammer2_chain_t *chain;
848 hammer2_cluster_t *cluster;
849 const hammer2_inode_data_t *ripdata;
850 hammer2_blockref_t bref;
851 struct file *fp;
852 char devstr[MNAMELEN];
853 size_t size;
854 size_t done;
855 char *dev;
856 char *label;
857 int ronly = 1;
858 int error;
859 int cache_index;
860 int i;
861
862 hmp = NULL;
863 pmp = NULL;
864 dev = NULL;
865 label = NULL;
866 devvp = NULL;
867 cache_index = -1;
868
869 kprintf("hammer2_mount\n");
870
871 if (path == NULL) {
872 /*
873 * Root mount
874 */
875 bzero(&info, sizeof(info));
876 info.cluster_fd = -1;
877 ksnprintf(devstr, sizeof(devstr), "%s",
878 mp->mnt_stat.f_mntfromname);
879 kprintf("hammer2_mount: root '%s'\n", devstr);
880 } else {
881 /*
882 * Non-root mount or updating a mount
883 */
884 error = copyin(data, &info, sizeof(info));
885 if (error)
886 return (error);
887
888 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
889 if (error)
890 return (error);
891 }
892
893 /*
894 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
895 * if no label specified, based on the partition id. Error out if no
896 * partition id. This is strictly a convenience to match the
897 * default label created by newfs_hammer2, our preference is
898 * that a label always be specified.
899 */
900 dev = devstr;
901 label = strchr(devstr, '@');
902 if (label && ((label + 1) - dev) > done)
903 return (EINVAL);
904 if (label && label == devstr)
905 return (EINVAL);
906 if (label == NULL || label[1] == 0) {
907 char slice;
908
909 if (label == NULL)
910 label = devstr + strlen(devstr);
911 slice = label[-1];
912 switch(slice) {
913 case 'a':
914 label = "BOOT";
915 break;
916 case 'd':
917 label = "ROOT";
918 break;
919 default:
920 label = "DATA";
921 break;
922 }
923 } else {
924 *label = '\0';
925 label++;
926 }
927
928 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
929 dev, label, (mp->mnt_flag & MNT_RDONLY));
930
931 if (mp->mnt_flag & MNT_UPDATE) {
932 /*
933 * Update mount. Note that pmp->iroot->cluster is
934 * an inode-embedded cluster and thus cannot be
935 * directly locked.
936 *
937 * XXX HAMMER2 needs to implement NFS export via
938 * mountctl.
939 */
940 pmp = MPTOPMP(mp);
941 pmp->hflags = info.hflags;
942 cluster = &pmp->iroot->cluster;
943 for (i = 0; i < cluster->nchains; ++i) {
944 if (cluster->array[i].chain == NULL)
945 continue;
946 hmp = cluster->array[i].chain->hmp;
947 devvp = hmp->devvp;
948 error = hammer2_remount(hmp, mp, path,
949 devvp, cred);
950 if (error)
951 break;
952 }
953
954 return error;
955 }
956
957 /*
958 * HMP device mount
959 *
960 * If a path is specified and dev is not an empty string, lookup the
961 * name and verify that it referes to a block device.
962 *
963 * If a path is specified and dev is an empty string we fall through
964 * and locate the label in the hmp search.
965 */
966 if (path && *dev != 0) {
967 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
968 if (error == 0)
969 error = nlookup(&nd);
970 if (error == 0)
971 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
972 nlookup_done(&nd);
973 } else if (path == NULL) {
974 /* root mount */
975 cdev_t cdev = kgetdiskbyname(dev);
976 error = bdevvp(cdev, &devvp);
977 if (error)
978 kprintf("hammer2: cannot find '%s'\n", dev);
979 } else {
980 /*
981 * We will locate the hmp using the label in the hmp loop.
982 */
983 error = 0;
984 }
985
986 /*
987 * Make sure its a block device. Do not check to see if it is
988 * already mounted until we determine that its a fresh H2 device.
989 */
990 if (error == 0 && devvp) {
991 vn_isdisk(devvp, &error);
992 }
993
994 /*
995 * Determine if the device has already been mounted. After this
996 * check hmp will be non-NULL if we are doing the second or more
997 * hammer2 mounts from the same device.
998 */
999 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1000 if (devvp) {
1001 /*
1002 * Match the device. Due to the way devfs works,
1003 * we may not be able to directly match the vnode pointer,
1004 * so also check to see if the underlying device matches.
1005 */
1006 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1007 if (hmp->devvp == devvp)
1008 break;
1009 if (devvp->v_rdev &&
1010 hmp->devvp->v_rdev == devvp->v_rdev) {
1011 break;
1012 }
1013 }
1014
1015 /*
1016 * If no match this may be a fresh H2 mount, make sure
1017 * the device is not mounted on anything else.
1018 */
1019 if (hmp == NULL)
1020 error = vfs_mountedon(devvp);
1021 } else if (error == 0) {
1022 /*
1023 * Match the label to a pmp already probed.
1024 */
1025 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1026 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1027 if (pmp->pfs_names[i] &&
1028 strcmp(pmp->pfs_names[i], label) == 0) {
1029 hmp = pmp->pfs_hmps[i];
1030 break;
1031 }
1032 }
1033 if (hmp)
1034 break;
1035 }
1036 if (hmp == NULL)
1037 error = ENOENT;
1038 }
1039
1040 /*
1041 * Open the device if this isn't a secondary mount and construct
1042 * the H2 device mount (hmp).
1043 */
1044 if (hmp == NULL) {
1045 hammer2_chain_t *schain;
1046 hammer2_xid_t xid;
1047
1048 if (error == 0 && vcount(devvp) > 0) {
1049 kprintf("Primary device already has references\n");
1050 error = EBUSY;
1051 }
1052
1053 /*
1054 * Now open the device
1055 */
1056 if (error == 0) {
1057 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1058 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1059 error = vinvalbuf(devvp, V_SAVE, 0, 0);
1060 if (error == 0) {
1061 error = VOP_OPEN(devvp,
1062 (ronly ? FREAD : FREAD | FWRITE),
1063 FSCRED, NULL);
1064 }
1065 vn_unlock(devvp);
1066 }
1067 if (error && devvp) {
1068 vrele(devvp);
1069 devvp = NULL;
1070 }
1071 if (error) {
1072 lockmgr(&hammer2_mntlk, LK_RELEASE);
1073 return error;
1074 }
1075 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1076 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1077 hmp->ronly = ronly;
1078 hmp->devvp = devvp;
1079 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1080 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1081 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1082 RB_INIT(&hmp->iotree);
1083 spin_init(&hmp->io_spin, "hm2mount_io");
1084 spin_init(&hmp->list_spin, "hm2mount_list");
1085 TAILQ_INIT(&hmp->flushq);
1086
1087 lockinit(&hmp->vollk, "h2vol", 0, 0);
1088 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1089 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1090
1091 /*
1092 * vchain setup. vchain.data is embedded.
1093 * vchain.refs is initialized and will never drop to 0.
1094 *
1095 * NOTE! voldata is not yet loaded.
1096 */
1097 hmp->vchain.hmp = hmp;
1098 hmp->vchain.refs = 1;
1099 hmp->vchain.data = (void *)&hmp->voldata;
1100 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1101 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1102 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1103
1104 hammer2_chain_core_init(&hmp->vchain);
1105 /* hmp->vchain.u.xxx is left NULL */
1106
1107 /*
1108 * fchain setup. fchain.data is embedded.
1109 * fchain.refs is initialized and will never drop to 0.
1110 *
1111 * The data is not used but needs to be initialized to
1112 * pass assertion muster. We use this chain primarily
1113 * as a placeholder for the freemap's top-level RBTREE
1114 * so it does not interfere with the volume's topology
1115 * RBTREE.
1116 */
1117 hmp->fchain.hmp = hmp;
1118 hmp->fchain.refs = 1;
1119 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1120 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1121 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1122 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1123 hmp->fchain.bref.methods =
1124 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1125 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1126
1127 hammer2_chain_core_init(&hmp->fchain);
1128 /* hmp->fchain.u.xxx is left NULL */
1129
1130 /*
1131 * Install the volume header and initialize fields from
1132 * voldata.
1133 */
1134 error = hammer2_install_volume_header(hmp);
1135 if (error) {
1136 hammer2_unmount_helper(mp, NULL, hmp);
1137 lockmgr(&hammer2_mntlk, LK_RELEASE);
1138 hammer2_vfs_unmount(mp, MNT_FORCE);
1139 return error;
1140 }
1141
1142 /*
1143 * Really important to get these right or flush will get
1144 * confused.
1145 */
1146 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1147 kprintf("alloc spmp %p tid %016jx\n",
1148 hmp->spmp, hmp->voldata.mirror_tid);
1149 spmp = hmp->spmp;
1150
1151 /*
1152 * Dummy-up vchain and fchain's modify_tid. mirror_tid
1153 * is inherited from the volume header.
1154 */
1155 xid = 0;
1156 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1157 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1158 hmp->vchain.pmp = spmp;
1159 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1160 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1161 hmp->fchain.pmp = spmp;
1162
1163 /*
1164 * First locate the super-root inode, which is key 0
1165 * relative to the volume header's blockset.
1166 *
1167 * Then locate the root inode by scanning the directory keyspace
1168 * represented by the label.
1169 */
1170 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1171 schain = hammer2_chain_lookup(&parent, &key_dummy,
1172 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1173 &cache_index, 0);
1174 hammer2_chain_lookup_done(parent);
1175 if (schain == NULL) {
1176 kprintf("hammer2_mount: invalid super-root\n");
1177 hammer2_unmount_helper(mp, NULL, hmp);
1178 lockmgr(&hammer2_mntlk, LK_RELEASE);
1179 hammer2_vfs_unmount(mp, MNT_FORCE);
1180 return EINVAL;
1181 }
1182 if (schain->error) {
1183 kprintf("hammer2_mount: error %s reading super-root\n",
1184 hammer2_error_str(schain->error));
1185 hammer2_chain_unlock(schain);
1186 hammer2_chain_drop(schain);
1187 schain = NULL;
1188 hammer2_unmount_helper(mp, NULL, hmp);
1189 lockmgr(&hammer2_mntlk, LK_RELEASE);
1190 hammer2_vfs_unmount(mp, MNT_FORCE);
1191 return EINVAL;
1192 }
1193
1194 /*
1195 * The super-root always uses an inode_tid of 1 when
1196 * creating PFSs.
1197 */
1198 spmp->inode_tid = 1;
1199 spmp->modify_tid = schain->bref.modify_tid + 1;
1200
1201 /*
1202 * Sanity-check schain's pmp and finish initialization.
1203 * Any chain belonging to the super-root topology should
1204 * have a NULL pmp (not even set to spmp).
1205 */
1206 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1207 KKASSERT(schain->pmp == NULL);
1208 spmp->pfs_clid = ripdata->meta.pfs_clid;
1209
1210 /*
1211 * Replace the dummy spmp->iroot with a real one. It's
1212 * easier to just do a wholesale replacement than to try
1213 * to update the chain and fixup the iroot fields.
1214 *
1215 * The returned inode is locked with the supplied cluster.
1216 */
1217 cluster = hammer2_cluster_from_chain(schain);
1218 hammer2_inode_drop(spmp->iroot);
1219 spmp->iroot = NULL;
1220 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1221 spmp->spmp_hmp = hmp;
1222 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1223 spmp->pfs_hmps[0] = hmp;
1224 hammer2_inode_ref(spmp->iroot);
1225 hammer2_inode_unlock(spmp->iroot);
1226 hammer2_cluster_unlock(cluster);
1227 hammer2_cluster_drop(cluster);
1228 schain = NULL;
1229 /* leave spmp->iroot with one ref */
1230
1231 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1232 error = hammer2_recovery(hmp);
1233 /* XXX do something with error */
1234 }
1235 hammer2_update_pmps(hmp);
1236 hammer2_iocom_init(hmp);
1237 hammer2_bulkfree_init(hmp);
1238
1239 /*
1240 * Ref the cluster management messaging descriptor. The mount
1241 * program deals with the other end of the communications pipe.
1242 *
1243 * Root mounts typically do not supply one.
1244 */
1245 if (info.cluster_fd >= 0) {
1246 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1247 if (fp) {
1248 hammer2_cluster_reconnect(hmp, fp);
1249 } else {
1250 kprintf("hammer2_mount: bad cluster_fd!\n");
1251 }
1252 }
1253 } else {
1254 spmp = hmp->spmp;
1255 if (info.hflags & HMNT2_DEVFLAGS) {
1256 kprintf("hammer2: Warning: mount flags pertaining "
1257 "to the whole device may only be specified "
1258 "on the first mount of the device: %08x\n",
1259 info.hflags & HMNT2_DEVFLAGS);
1260 }
1261 }
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 the mount point under the media-localized super-root.
1271 * Scanning hammer2_pfslist doesn't help us because it represents
1272 * PFS cluster ids which can aggregate several named PFSs together.
1273 *
1274 * cluster->pmp will incorrectly point to spmp and must be fixed
1275 * up later on.
1276 */
1277 hammer2_inode_lock(spmp->iroot, 0);
1278 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1279 lhc = hammer2_dirhash(label, strlen(label));
1280 chain = hammer2_chain_lookup(&parent, &key_next,
1281 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1282 &cache_index, 0);
1283 while (chain) {
1284 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1285 strcmp(label, chain->data->ipdata.filename) == 0) {
1286 break;
1287 }
1288 chain = hammer2_chain_next(&parent, chain, &key_next,
1289 key_next,
1290 lhc + HAMMER2_DIRHASH_LOMASK,
1291 &cache_index, 0);
1292 }
1293 if (parent) {
1294 hammer2_chain_unlock(parent);
1295 hammer2_chain_drop(parent);
1296 }
1297 hammer2_inode_unlock(spmp->iroot);
1298
1299 /*
1300 * PFS could not be found?
1301 */
1302 if (chain == NULL) {
1303 kprintf("hammer2_mount: PFS label not found\n");
1304 hammer2_unmount_helper(mp, NULL, hmp);
1305 lockmgr(&hammer2_mntlk, LK_RELEASE);
1306 hammer2_vfs_unmount(mp, MNT_FORCE);
1307
1308 return EINVAL;
1309 }
1310
1311 /*
1312 * Acquire the pmp structure (it should have already been allocated
1313 * via hammer2_update_pmps() so do not pass cluster in to add to
1314 * available chains).
1315 *
1316 * Check if the cluster has already been mounted. A cluster can
1317 * only be mounted once, use null mounts to mount additional copies.
1318 */
1319 ripdata = &chain->data->ipdata;
1320 bref = chain->bref;
1321 pmp = hammer2_pfsalloc(NULL, ripdata,
1322 bref.modify_tid, force_local);
1323 hammer2_chain_unlock(chain);
1324 hammer2_chain_drop(chain);
1325
1326 /*
1327 * Finish the mount
1328 */
1329 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1330
1331 if (pmp->mp) {
1332 kprintf("hammer2_mount: PFS already mounted!\n");
1333 hammer2_unmount_helper(mp, NULL, hmp);
1334 lockmgr(&hammer2_mntlk, LK_RELEASE);
1335 hammer2_vfs_unmount(mp, MNT_FORCE);
1336
1337 return EBUSY;
1338 }
1339
1340 pmp->hflags = info.hflags;
1341 mp->mnt_flag |= MNT_LOCAL;
1342 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
1343 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
1344
1345 /*
1346 * required mount structure initializations
1347 */
1348 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1349 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1350
1351 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1352 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1353
1354 /*
1355 * Optional fields
1356 */
1357 mp->mnt_iosize_max = MAXPHYS;
1358
1359 /*
1360 * Connect up mount pointers.
1361 */
1362 hammer2_mount_helper(mp, pmp);
1363
1364 lockmgr(&hammer2_mntlk, LK_RELEASE);
1365
1366 /*
1367 * Finish setup
1368 */
1369 vfs_getnewfsid(mp);
1370 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1371 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1372 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1373
1374 if (path) {
1375 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1376 MNAMELEN - 1, &size);
1377 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1378 } /* else root mount, already in there */
1379
1380 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1381 if (path) {
1382 copyinstr(path, mp->mnt_stat.f_mntonname,
1383 sizeof(mp->mnt_stat.f_mntonname) - 1,
1384 &size);
1385 } else {
1386 /* root mount */
1387 mp->mnt_stat.f_mntonname[0] = '/';
1388 }
1389
1390 /*
1391 * Initial statfs to prime mnt_stat.
1392 */
1393 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1394
1395 return 0;
1396 }
1397
1398 /*
1399 * Scan PFSs under the super-root and create hammer2_pfs structures.
1400 */
1401 static
1402 void
1403 hammer2_update_pmps(hammer2_dev_t *hmp)
1404 {
1405 const hammer2_inode_data_t *ripdata;
1406 hammer2_chain_t *parent;
1407 hammer2_chain_t *chain;
1408 hammer2_blockref_t bref;
1409 hammer2_dev_t *force_local;
1410 hammer2_pfs_t *spmp;
1411 hammer2_pfs_t *pmp;
1412 hammer2_key_t key_next;
1413 int cache_index = -1;
1414
1415 /*
1416 * Force local mount (disassociate all PFSs from their clusters).
1417 * Used primarily for debugging.
1418 */
1419 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1420
1421 /*
1422 * Lookup mount point under the media-localized super-root.
1423 *
1424 * cluster->pmp will incorrectly point to spmp and must be fixed
1425 * up later on.
1426 */
1427 spmp = hmp->spmp;
1428 hammer2_inode_lock(spmp->iroot, 0);
1429 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1430 chain = hammer2_chain_lookup(&parent, &key_next,
1431 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1432 &cache_index, 0);
1433 while (chain) {
1434 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1435 continue;
1436 ripdata = &chain->data->ipdata;
1437 bref = chain->bref;
1438 kprintf("ADD LOCAL PFS: %s\n", ripdata->filename);
1439
1440 pmp = hammer2_pfsalloc(chain, ripdata,
1441 bref.modify_tid, force_local);
1442 chain = hammer2_chain_next(&parent, chain, &key_next,
1443 key_next, HAMMER2_KEY_MAX,
1444 &cache_index, 0);
1445 }
1446 if (parent) {
1447 hammer2_chain_unlock(parent);
1448 hammer2_chain_drop(parent);
1449 }
1450 hammer2_inode_unlock(spmp->iroot);
1451 }
1452
1453 static
1454 int
1455 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1456 struct vnode *devvp, struct ucred *cred)
1457 {
1458 int error;
1459
1460 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1461 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1462 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1463 vn_unlock(devvp);
1464 error = hammer2_recovery(hmp);
1465 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1466 if (error == 0) {
1467 VOP_CLOSE(devvp, FREAD, NULL);
1468 hmp->ronly = 0;
1469 } else {
1470 VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1471 }
1472 vn_unlock(devvp);
1473 } else {
1474 error = 0;
1475 }
1476 return error;
1477 }
1478
1479 static
1480 int
1481 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1482 {
1483 hammer2_pfs_t *pmp;
1484 int flags;
1485 int error = 0;
1486
1487 pmp = MPTOPMP(mp);
1488
1489 if (pmp == NULL)
1490 return(0);
1491
1492 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1493
1494 /*
1495 * If mount initialization proceeded far enough we must flush
1496 * its vnodes and sync the underlying mount points. Three syncs
1497 * are required to fully flush the filesystem (freemap updates lag
1498 * by one flush, and one extra for safety).
1499 */
1500 if (mntflags & MNT_FORCE)
1501 flags = FORCECLOSE;
1502 else
1503 flags = 0;
1504 if (pmp->iroot) {
1505 error = vflush(mp, 0, flags);
1506 if (error)
1507 goto failed;
1508 hammer2_vfs_sync(mp, MNT_WAIT);
1509 hammer2_vfs_sync(mp, MNT_WAIT);
1510 hammer2_vfs_sync(mp, MNT_WAIT);
1511 }
1512
1513 /*
1514 * Cleanup the frontend support XOPS threads
1515 */
1516 hammer2_xop_helper_cleanup(pmp);
1517
1518 if (pmp->mp)
1519 hammer2_unmount_helper(mp, pmp, NULL);
1520
1521 error = 0;
1522 failed:
1523 lockmgr(&hammer2_mntlk, LK_RELEASE);
1524
1525 return (error);
1526 }
1527
1528 /*
1529 * Mount helper, hook the system mount into our PFS.
1530 * The mount lock is held.
1531 *
1532 * We must bump the mount_count on related devices for any
1533 * mounted PFSs.
1534 */
1535 static
1536 void
1537 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1538 {
1539 hammer2_cluster_t *cluster;
1540 hammer2_chain_t *rchain;
1541 int i;
1542
1543 mp->mnt_data = (qaddr_t)pmp;
1544 pmp->mp = mp;
1545
1546 /*
1547 * After pmp->mp is set we have to adjust hmp->mount_count.
1548 */
1549 cluster = &pmp->iroot->cluster;
1550 for (i = 0; i < cluster->nchains; ++i) {
1551 rchain = cluster->array[i].chain;
1552 if (rchain == NULL)
1553 continue;
1554 ++rchain->hmp->mount_count;
1555 kprintf("hammer2_mount hmp=%p ++mount_count=%d\n",
1556 rchain->hmp, rchain->hmp->mount_count);
1557 }
1558
1559 /*
1560 * Create missing Xop threads
1561 */
1562 hammer2_xop_helper_create(pmp);
1563 }
1564
1565 /*
1566 * Mount helper, unhook the system mount from our PFS.
1567 * The mount lock is held.
1568 *
1569 * If hmp is supplied a mount responsible for being the first to open
1570 * the block device failed and the block device and all PFSs using the
1571 * block device must be cleaned up.
1572 *
1573 * If pmp is supplied multiple devices might be backing the PFS and each
1574 * must be disconnected. This might not be the last PFS using some of the
1575 * underlying devices. Also, we have to adjust our hmp->mount_count
1576 * accounting for the devices backing the pmp which is now undergoing an
1577 * unmount.
1578 */
1579 static
1580 void
1581 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1582 {
1583 hammer2_cluster_t *cluster;
1584 hammer2_chain_t *rchain;
1585 struct vnode *devvp;
1586 int dumpcnt;
1587 int ronly;
1588 int i;
1589
1590 /*
1591 * If no device supplied this is a high-level unmount and we have to
1592 * to disconnect the mount, adjust mount_count, and locate devices
1593 * that might now have no mounts.
1594 */
1595 if (pmp) {
1596 KKASSERT(hmp == NULL);
1597 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1598 pmp->mp = NULL;
1599 mp->mnt_data = NULL;
1600
1601 /*
1602 * After pmp->mp is cleared we have to account for
1603 * mount_count.
1604 */
1605 cluster = &pmp->iroot->cluster;
1606 for (i = 0; i < cluster->nchains; ++i) {
1607 rchain = cluster->array[i].chain;
1608 if (rchain == NULL)
1609 continue;
1610 --rchain->hmp->mount_count;
1611 kprintf("hammer2_unmount hmp=%p --mount_count=%d\n",
1612 rchain->hmp, rchain->hmp->mount_count);
1613 /* scrapping hmp now may invalidate the pmp */
1614 }
1615 again:
1616 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1617 if (hmp->mount_count == 0) {
1618 hammer2_unmount_helper(NULL, NULL, hmp);
1619 goto again;
1620 }
1621 }
1622 return;
1623 }
1624
1625 /*
1626 * Try to terminate the block device. We can't terminate it if
1627 * there are still PFSs referencing it.
1628 */
1629 kprintf("hammer2_unmount hmp=%p mount_count=%d\n",
1630 hmp, hmp->mount_count);
1631 if (hmp->mount_count)
1632 return;
1633
1634 hammer2_bulkfree_uninit(hmp);
1635 hammer2_pfsfree_scan(hmp);
1636 hammer2_dev_exlock(hmp); /* XXX order */
1637
1638 /*
1639 * Cycle the volume data lock as a safety (probably not needed any
1640 * more). To ensure everything is out we need to flush at least
1641 * three times. (1) The running of the sideq can dirty the
1642 * filesystem, (2) A normal flush can dirty the freemap, and
1643 * (3) ensure that the freemap is fully synchronized.
1644 *
1645 * The next mount's recovery scan can clean everything up but we want
1646 * to leave the filesystem in a 100% clean state on a normal unmount.
1647 */
1648 #if 0
1649 hammer2_voldata_lock(hmp);
1650 hammer2_voldata_unlock(hmp);
1651 #endif
1652 hammer2_iocom_uninit(hmp);
1653
1654 if ((hmp->vchain.flags | hmp->fchain.flags) &
1655 HAMMER2_CHAIN_FLUSH_MASK) {
1656 kprintf("hammer2_unmount: chains left over "
1657 "after final sync\n");
1658 kprintf(" vchain %08x\n", hmp->vchain.flags);
1659 kprintf(" fchain %08x\n", hmp->fchain.flags);
1660
1661 if (hammer2_debug & 0x0010)
1662 Debugger("entered debugger");
1663 }
1664
1665 KKASSERT(hmp->spmp == NULL);
1666
1667 /*
1668 * Finish up with the device vnode
1669 */
1670 if ((devvp = hmp->devvp) != NULL) {
1671 ronly = hmp->ronly;
1672 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1673 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1674 hmp->devvp = NULL;
1675 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1676 vn_unlock(devvp);
1677 vrele(devvp);
1678 devvp = NULL;
1679 }
1680
1681 /*
1682 * Clear vchain/fchain flags that might prevent final cleanup
1683 * of these chains.
1684 */
1685 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1686 atomic_add_long(&hammer2_count_modified_chains, -1);
1687 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1688 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1689 }
1690 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1691 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1692 }
1693
1694 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1695 atomic_add_long(&hammer2_count_modified_chains, -1);
1696 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1697 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1698 }
1699 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1700 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1701 }
1702
1703 /*
1704 * Final drop of embedded freemap root chain to
1705 * clean up fchain.core (fchain structure is not
1706 * flagged ALLOCATED so it is cleaned out and then
1707 * left to rot).
1708 */
1709 hammer2_chain_drop(&hmp->fchain);
1710
1711 /*
1712 * Final drop of embedded volume root chain to clean
1713 * up vchain.core (vchain structure is not flagged
1714 * ALLOCATED so it is cleaned out and then left to
1715 * rot).
1716 */
1717 dumpcnt = 50;
1718 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v');
1719 dumpcnt = 50;
1720 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f');
1721 hammer2_dev_unlock(hmp);
1722 hammer2_chain_drop(&hmp->vchain);
1723
1724 hammer2_io_cleanup(hmp, &hmp->iotree);
1725 if (hmp->iofree_count) {
1726 kprintf("io_cleanup: %d I/O's left hanging\n",
1727 hmp->iofree_count);
1728 }
1729
1730 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1731 kmalloc_destroy(&hmp->mchain);
1732 kfree(hmp, M_HAMMER2);
1733 }
1734
1735 int
1736 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1737 ino_t ino, struct vnode **vpp)
1738 {
1739 hammer2_xop_lookup_t *xop;
1740 hammer2_pfs_t *pmp;
1741 hammer2_inode_t *ip;
1742 hammer2_tid_t inum;
1743 int error;
1744
1745 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1746
1747 error = 0;
1748 pmp = MPTOPMP(mp);
1749
1750 /*
1751 * Easy if we already have it cached
1752 */
1753 ip = hammer2_inode_lookup(pmp, inum);
1754 if (ip) {
1755 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1756 *vpp = hammer2_igetv(ip, &error);
1757 hammer2_inode_unlock(ip);
1758 hammer2_inode_drop(ip); /* from lookup */
1759
1760 return error;
1761 }
1762
1763 /*
1764 * Otherwise we have to find the inode
1765 */
1766 xop = hammer2_xop_alloc(pmp->iroot, 0);
1767 xop->lhc = inum;
1768 hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1769 error = hammer2_xop_collect(&xop->head, 0);
1770
1771 if (error == 0) {
1772 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1773 kprintf("vget: no collect error but also no rdata\n");
1774 kprintf("xop %p\n", xop);
1775 while ((hammer2_debug & 0x80000) == 0) {
1776 tsleep(xop, PCATCH, "wait", hz * 10);
1777 }
1778 ip = NULL;
1779 } else {
1780 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1781 }
1782 }
1783 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1784
1785 if (ip) {
1786 *vpp = hammer2_igetv(ip, &error);
1787 hammer2_inode_unlock(ip);
1788 } else {
1789 *vpp = NULL;
1790 error = ENOENT;
1791 }
1792 return (error);
1793 }
1794
1795 static
1796 int
1797 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1798 {
1799 hammer2_pfs_t *pmp;
1800 struct vnode *vp;
1801 int error;
1802
1803 pmp = MPTOPMP(mp);
1804 if (pmp->iroot == NULL) {
1805 *vpp = NULL;
1806 return EINVAL;
1807 }
1808
1809 error = 0;
1810 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1811
1812 while (pmp->inode_tid == 0) {
1813 hammer2_xop_ipcluster_t *xop;
1814 hammer2_inode_meta_t *meta;
1815
1816 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1817 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1818 error = hammer2_xop_collect(&xop->head, 0);
1819
1820 if (error == 0) {
1821 meta = &xop->head.cluster.focus->data->ipdata.meta;
1822 pmp->iroot->meta = *meta;
1823 pmp->inode_tid = meta->pfs_inum + 1;
1824 if (pmp->inode_tid < HAMMER2_INODE_START)
1825 pmp->inode_tid = HAMMER2_INODE_START;
1826 pmp->modify_tid =
1827 xop->head.cluster.focus->bref.modify_tid + 1;
1828 kprintf("PFS: Starting inode %jd\n",
1829 (intmax_t)pmp->inode_tid);
1830 kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1831 pmp->inode_tid, pmp->modify_tid);
1832 wakeup(&pmp->iroot);
1833
1834 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1835
1836 /*
1837 * Prime the mount info.
1838 */
1839 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1840 break;
1841 }
1842
1843 /*
1844 * Loop, try again
1845 */
1846 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1847 hammer2_inode_unlock(pmp->iroot);
1848 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1849 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1850 if (error == EINTR)
1851 break;
1852 }
1853
1854 if (error) {
1855 hammer2_inode_unlock(pmp->iroot);
1856 *vpp = NULL;
1857 } else {
1858 vp = hammer2_igetv(pmp->iroot, &error);
1859 hammer2_inode_unlock(pmp->iroot);
1860 *vpp = vp;
1861 }
1862
1863 return (error);
1864 }
1865
1866 /*
1867 * Filesystem status
1868 *
1869 * XXX incorporate ipdata->meta.inode_quota and data_quota
1870 */
1871 static
1872 int
1873 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1874 {
1875 hammer2_pfs_t *pmp;
1876 hammer2_dev_t *hmp;
1877 hammer2_blockref_t bref;
1878 int i;
1879
1880 /*
1881 * NOTE: iroot might not have validated the cluster yet.
1882 */
1883 pmp = MPTOPMP(mp);
1884
1885 mp->mnt_stat.f_files = 0;
1886 mp->mnt_stat.f_ffree = 0;
1887 mp->mnt_stat.f_blocks = 0;
1888 mp->mnt_stat.f_bfree = 0;
1889 mp->mnt_stat.f_bavail = 0;
1890
1891 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1892 hmp = pmp->pfs_hmps[i];
1893 if (hmp == NULL)
1894 continue;
1895 if (pmp->iroot->cluster.array[i].chain)
1896 bref = pmp->iroot->cluster.array[i].chain->bref;
1897 else
1898 bzero(&bref, sizeof(bref));
1899
1900 mp->mnt_stat.f_files = bref.embed.stats.inode_count;
1901 mp->mnt_stat.f_ffree = 0;
1902 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size /
1903 mp->mnt_vstat.f_bsize;
1904 mp->mnt_stat.f_bfree = hmp->voldata.allocator_free /
1905 mp->mnt_vstat.f_bsize;
1906 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1907
1908 *sbp = mp->mnt_stat;
1909 }
1910 return (0);
1911 }
1912
1913 static
1914 int
1915 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1916 {
1917 hammer2_pfs_t *pmp;
1918 hammer2_dev_t *hmp;
1919 hammer2_blockref_t bref;
1920 int i;
1921
1922 /*
1923 * NOTE: iroot might not have validated the cluster yet.
1924 */
1925 pmp = MPTOPMP(mp);
1926
1927 mp->mnt_vstat.f_bsize = 0;
1928 mp->mnt_vstat.f_files = 0;
1929 mp->mnt_vstat.f_ffree = 0;
1930 mp->mnt_vstat.f_blocks = 0;
1931 mp->mnt_vstat.f_bfree = 0;
1932 mp->mnt_vstat.f_bavail = 0;
1933
1934 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1935 hmp = pmp->pfs_hmps[i];
1936 if (hmp == NULL)
1937 continue;
1938 if (pmp->iroot->cluster.array[i].chain)
1939 bref = pmp->iroot->cluster.array[i].chain->bref;
1940 else
1941 bzero(&bref, sizeof(bref));
1942
1943 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1944 mp->mnt_vstat.f_files = bref.embed.stats.inode_count;
1945 mp->mnt_vstat.f_ffree = 0;
1946 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size /
1947 mp->mnt_vstat.f_bsize;
1948 mp->mnt_vstat.f_bfree = hmp->voldata.allocator_free /
1949 mp->mnt_vstat.f_bsize;
1950 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1951
1952 *sbp = mp->mnt_vstat;
1953 }
1954 return (0);
1955 }
1956
1957 /*
1958 * Mount-time recovery (RW mounts)
1959 *
1960 * Updates to the free block table are allowed to lag flushes by one
1961 * transaction. In case of a crash, then on a fresh mount we must do an
1962 * incremental scan of the last committed transaction id and make sure that
1963 * all related blocks have been marked allocated.
1964 *
1965 * The super-root topology and each PFS has its own transaction id domain,
1966 * so we must track PFS boundary transitions.
1967 */
1968 struct hammer2_recovery_elm {
1969 TAILQ_ENTRY(hammer2_recovery_elm) entry;
1970 hammer2_chain_t *chain;
1971 hammer2_tid_t sync_tid;
1972 };
1973
1974 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
1975
1976 struct hammer2_recovery_info {
1977 struct hammer2_recovery_list list;
1978 hammer2_tid_t mtid;
1979 int depth;
1980 };
1981
1982 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
1983 hammer2_chain_t *parent,
1984 struct hammer2_recovery_info *info,
1985 hammer2_tid_t sync_tid);
1986
1987 #define HAMMER2_RECOVERY_MAXDEPTH 10
1988
1989 static
1990 int
1991 hammer2_recovery(hammer2_dev_t *hmp)
1992 {
1993 struct hammer2_recovery_info info;
1994 struct hammer2_recovery_elm *elm;
1995 hammer2_chain_t *parent;
1996 hammer2_tid_t sync_tid;
1997 hammer2_tid_t mirror_tid;
1998 int error;
1999 int cumulative_error = 0;
2000
2001 hammer2_trans_init(hmp->spmp, 0);
2002
2003 sync_tid = hmp->voldata.freemap_tid;
2004 mirror_tid = hmp->voldata.mirror_tid;
2005
2006 kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2007 if (sync_tid >= mirror_tid) {
2008 kprintf(" no recovery needed\n");
2009 } else {
2010 kprintf(" freemap recovery %016jx-%016jx\n",
2011 sync_tid + 1, mirror_tid);
2012 }
2013
2014 TAILQ_INIT(&info.list);
2015 info.depth = 0;
2016 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2017 cumulative_error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2018 hammer2_chain_lookup_done(parent);
2019
2020 while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2021 TAILQ_REMOVE(&info.list, elm, entry);
2022 parent = elm->chain;
2023 sync_tid = elm->sync_tid;
2024 kfree(elm, M_HAMMER2);
2025
2026 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2027 error = hammer2_recovery_scan(hmp, parent, &info,
2028 hmp->voldata.freemap_tid);
2029 hammer2_chain_unlock(parent);
2030 hammer2_chain_drop(parent); /* drop elm->chain ref */
2031 if (error)
2032 cumulative_error = error;
2033 }
2034 hammer2_trans_done(hmp->spmp);
2035
2036 return cumulative_error;
2037 }
2038
2039 static
2040 int
2041 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2042 struct hammer2_recovery_info *info,
2043 hammer2_tid_t sync_tid)
2044 {
2045 const hammer2_inode_data_t *ripdata;
2046 hammer2_chain_t *chain;
2047 hammer2_blockref_t bref;
2048 int cache_index;
2049 int cumulative_error = 0;
2050 int error;
2051 int first;
2052
2053 /*
2054 * Adjust freemap to ensure that the block(s) are marked allocated.
2055 */
2056 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2057 hammer2_freemap_adjust(hmp, &parent->bref,
2058 HAMMER2_FREEMAP_DORECOVER);
2059 }
2060
2061 /*
2062 * Check type for recursive scan
2063 */
2064 switch(parent->bref.type) {
2065 case HAMMER2_BREF_TYPE_VOLUME:
2066 /* data already instantiated */
2067 break;
2068 case HAMMER2_BREF_TYPE_INODE:
2069 /*
2070 * Must instantiate data for DIRECTDATA test and also
2071 * for recursion.
2072 */
2073 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2074 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2075 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2076 /* not applicable to recovery scan */
2077 hammer2_chain_unlock(parent);
2078 return 0;
2079 }
2080 hammer2_chain_unlock(parent);
2081 break;
2082 case HAMMER2_BREF_TYPE_INDIRECT:
2083 /*
2084 * Must instantiate data for recursion
2085 */
2086 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2087 hammer2_chain_unlock(parent);
2088 break;
2089 case HAMMER2_BREF_TYPE_DIRENT:
2090 case HAMMER2_BREF_TYPE_DATA:
2091 case HAMMER2_BREF_TYPE_FREEMAP:
2092 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2093 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2094 /* not applicable to recovery scan */
2095 return 0;
2096 break;
2097 default:
2098 return EDOM;
2099 }
2100
2101 /*
2102 * Defer operation if depth limit reached or if we are crossing a
2103 * PFS boundary.
2104 */
2105 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2106 struct hammer2_recovery_elm *elm;
2107
2108 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2109 elm->chain = parent;
2110 elm->sync_tid = sync_tid;
2111 hammer2_chain_ref(parent);
2112 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2113 /* unlocked by caller */
2114
2115 return(0);
2116 }
2117
2118
2119 /*
2120 * Recursive scan of the last flushed transaction only. We are
2121 * doing this without pmp assignments so don't leave the chains
2122 * hanging around after we are done with them.
2123 */
2124 cache_index = 0;
2125 chain = NULL;
2126 first = 1;
2127
2128 while (hammer2_chain_scan(parent, &chain, &bref,
2129 &first, &cache_index,
2130 HAMMER2_LOOKUP_NODATA) != NULL) {
2131 /*
2132 * If this is a leaf
2133 */
2134 if (chain == NULL) {
2135 if (bref.mirror_tid > sync_tid) {
2136 hammer2_freemap_adjust(hmp, &bref,
2137 HAMMER2_FREEMAP_DORECOVER);
2138 }
2139 continue;
2140 }
2141
2142 /*
2143 * This may or may not be a recursive node.
2144 */
2145 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2146 if (bref.mirror_tid > sync_tid) {
2147 ++info->depth;
2148 error = hammer2_recovery_scan(hmp, chain,
2149 info, sync_tid);
2150 --info->depth;
2151 if (error)
2152 cumulative_error = error;
2153 }
2154
2155 /*
2156 * Flush the recovery at the PFS boundary to stage it for
2157 * the final flush of the super-root topology.
2158 */
2159 if ((bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2160 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2161 hammer2_flush(chain, HAMMER2_FLUSH_TOP);
2162 }
2163 }
2164
2165 return cumulative_error;
2166 }
2167
2168 /*
2169 * Sync a mount point; this is called on a per-mount basis from the
2170 * filesystem syncer process periodically and whenever a user issues
2171 * a sync.
2172 */
2173 int
2174 hammer2_vfs_sync(struct mount *mp, int waitfor)
2175 {
2176 hammer2_xop_flush_t *xop;
2177 struct hammer2_sync_info info;
2178 hammer2_inode_t *iroot;
2179 hammer2_pfs_t *pmp;
2180 int flags;
2181 int error;
2182
2183 pmp = MPTOPMP(mp);
2184 iroot = pmp->iroot;
2185 KKASSERT(iroot);
2186 KKASSERT(iroot->pmp == pmp);
2187
2188 /*
2189 * We can't acquire locks on existing vnodes while in a transaction
2190 * without risking a deadlock. This assumes that vfsync() can be
2191 * called without the vnode locked (which it can in DragonFly).
2192 * Otherwise we'd have to implement a multi-pass or flag the lock
2193 * failures and retry.
2194 *
2195 * The reclamation code interlocks with the sync list's token
2196 * (by removing the vnode from the scan list) before unlocking
2197 * the inode, giving us time to ref the inode.
2198 */
2199 /*flags = VMSC_GETVP;*/
2200 flags = 0;
2201 if (waitfor & MNT_LAZY)
2202 flags |= VMSC_ONEPASS;
2203
2204 /*
2205 * Preflush the vnodes using a normal transaction before interlocking
2206 * with a flush transaction. We do this to try to run as much of
2207 * the compression as possible outside the flush transaction.
2208 *
2209 * For efficiency do an async pass before making sure with a
2210 * synchronous pass on all related buffer cache buffers.
2211 */
2212 hammer2_trans_init(pmp, 0);
2213 info.error = 0;
2214 info.waitfor = MNT_NOWAIT;
2215 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2216 info.waitfor = MNT_WAIT;
2217 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2218 hammer2_trans_done(pmp);
2219
2220 /*
2221 * Start our flush transaction. This does not return until all
2222 * concurrent transactions have completed and will prevent any
2223 * new transactions from running concurrently, except for the
2224 * buffer cache transactions.
2225 *
2226 * NOTE! It is still possible for the paging code to push pages
2227 * out via a UIO_NOCOPY hammer2_vop_write() during the main
2228 * flush.
2229 */
2230 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2231 hammer2_inode_run_sideq(pmp);
2232
2233 info.error = 0;
2234 info.waitfor = MNT_NOWAIT;
2235 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2236 info.waitfor = MNT_WAIT;
2237 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2238 hammer2_bioq_sync(pmp);
2239
2240 /*
2241 * Use the XOP interface to concurrently flush all nodes to
2242 * synchronize the PFSROOT subtopology to the media. A standard
2243 * end-of-scan ENOENT error indicates cluster sufficiency.
2244 *
2245 * Note that this flush will not be visible on crash recovery until
2246 * we flush the super-root topology in the next loop.
2247 *
2248 * XXX For now wait for all flushes to complete.
2249 */
2250 if (iroot) {
2251 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING);
2252 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2253 error = hammer2_xop_collect(&xop->head,
2254 HAMMER2_XOP_COLLECT_WAITALL);
2255 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2256 if (error == ENOENT)
2257 error = 0;
2258 } else {
2259 error = 0;
2260 }
2261 hammer2_trans_done(pmp);
2262
2263 return (error);
2264 }
2265
2266 /*
2267 * Sync passes.
2268 *
2269 * Note that we ignore the tranasction mtid we got above. Instead,
2270 * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2271 * transactions.
2272 */
2273 static int
2274 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2275 {
2276 struct hammer2_sync_info *info = data;
2277 hammer2_inode_t *ip;
2278 int error;
2279
2280 /*
2281 * Degenerate cases. Note that ip == NULL typically means the
2282 * syncer vnode itself and we don't want to vclrisdirty() in that
2283 * situation.
2284 */
2285 ip = VTOI(vp);
2286 if (ip == NULL) {
2287 return(0);
2288 }
2289 if (vp->v_type == VNON || vp->v_type == VBAD) {
2290 vclrisdirty(vp);
2291 return(0);
2292 }
2293
2294 /*
2295 * VOP_FSYNC will start a new transaction so replicate some code
2296 * here to do it inline (see hammer2_vop_fsync()).
2297 *
2298 * WARNING: The vfsync interacts with the buffer cache and might
2299 * block, we can't hold the inode lock at that time.
2300 * However, we MUST ref ip before blocking to ensure that
2301 * it isn't ripped out from under us (since we do not
2302 * hold a lock on the vnode).
2303 */
2304 hammer2_inode_ref(ip);
2305 if ((ip->flags & HAMMER2_INODE_MODIFIED) ||
2306 !RB_EMPTY(&vp->v_rbdirty_tree)) {
2307 vfsync(vp, info->waitfor, 1, NULL, NULL);
2308 if (ip->flags & (HAMMER2_INODE_RESIZED |
2309 HAMMER2_INODE_MODIFIED)) {
2310 hammer2_inode_lock(ip, 0);
2311 hammer2_inode_chain_sync(ip);
2312 hammer2_inode_unlock(ip);
2313 }
2314 }
2315 if ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
2316 RB_EMPTY(&vp->v_rbdirty_tree)) {
2317 vclrisdirty(vp);
2318 }
2319
2320 hammer2_inode_drop(ip);
2321 #if 1
2322 error = 0;
2323 if (error)
2324 info->error = error;
2325 #endif
2326 return(0);
2327 }
2328
2329 static
2330 int
2331 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2332 {
2333 hammer2_inode_t *ip;
2334
2335 KKASSERT(MAXFIDSZ >= 16);
2336 ip = VTOI(vp);
2337 fhp->fid_len = offsetof(struct fid, fid_data[16]);
2338 fhp->fid_ext = 0;
2339 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2340 ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2341
2342 return 0;
2343 }
2344
2345 static
2346 int
2347 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2348 struct fid *fhp, struct vnode **vpp)
2349 {
2350 hammer2_pfs_t *pmp;
2351 hammer2_tid_t inum;
2352 int error;
2353
2354 pmp = MPTOPMP(mp);
2355 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2356 if (vpp) {
2357 if (inum == 1)
2358 error = hammer2_vfs_root(mp, vpp);
2359 else
2360 error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2361 } else {
2362 error = 0;
2363 }
2364 if (error)
2365 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2366 return error;
2367 }
2368
2369 static
2370 int
2371 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2372 int *exflagsp, struct ucred **credanonp)
2373 {
2374 hammer2_pfs_t *pmp;
2375 struct netcred *np;
2376 int error;
2377
2378 pmp = MPTOPMP(mp);
2379 np = vfs_export_lookup(mp, &pmp->export, nam);
2380 if (np) {
2381 *exflagsp = np->netc_exflags;
2382 *credanonp = &np->netc_anon;
2383 error = 0;
2384 } else {
2385 error = EACCES;
2386 }
2387 return error;
2388 }
2389
2390 /*
2391 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume
2392 * header into the HMP
2393 *
2394 * XXX read four volhdrs and use the one with the highest TID whos CRC
2395 * matches.
2396 *
2397 * XXX check iCRCs.
2398 *
2399 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2400 * nonexistant locations.
2401 *
2402 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2403 */
2404 static
2405 int
2406 hammer2_install_volume_header(hammer2_dev_t *hmp)
2407 {
2408 hammer2_volume_data_t *vd;
2409 struct buf *bp;
2410 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2411 int error_reported;
2412 int error;
2413 int valid;
2414 int i;
2415
2416 error_reported = 0;
2417 error = 0;
2418 valid = 0;
2419 bp = NULL;
2420
2421 /*
2422 * There are up to 4 copies of the volume header (syncs iterate
2423 * between them so there is no single master). We don't trust the
2424 * volu_size field so we don't know precisely how large the filesystem
2425 * is, so depend on the OS to return an error if we go beyond the
2426 * block device's EOF.
2427 */
2428 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2429 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2430 HAMMER2_VOLUME_BYTES, &bp);
2431 if (error) {
2432 brelse(bp);
2433 bp = NULL;
2434 continue;
2435 }
2436
2437 vd = (struct hammer2_volume_data *) bp->b_data;
2438 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2439 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2440 brelse(bp);
2441 bp = NULL;
2442 continue;
2443 }
2444
2445 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2446 /* XXX: Reversed-endianness filesystem */
2447 kprintf("hammer2: reverse-endian filesystem detected");
2448 brelse(bp);
2449 bp = NULL;
2450 continue;
2451 }
2452
2453 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2454 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2455 HAMMER2_VOLUME_ICRC0_SIZE);
2456 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2457 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2458 HAMMER2_VOLUME_ICRC1_SIZE);
2459 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2460 kprintf("hammer2 volume header crc "
2461 "mismatch copy #%d %08x/%08x\n",
2462 i, crc0, crc);
2463 error_reported = 1;
2464 brelse(bp);
2465 bp = NULL;
2466 continue;
2467 }
2468 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2469 valid = 1;
2470 hmp->voldata = *vd;
2471 hmp->volhdrno = i;
2472 }
2473 brelse(bp);
2474 bp = NULL;
2475 }
2476 if (valid) {
2477 hmp->volsync = hmp->voldata;
2478 error = 0;
2479 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2480 kprintf("hammer2: using volume header #%d\n",
2481 hmp->volhdrno);
2482 }
2483 } else {
2484 error = EINVAL;
2485 kprintf("hammer2: no valid volume headers found!\n");
2486 }
2487 return (error);
2488 }
2489
2490 /*
2491 * This handles hysteresis on regular file flushes. Because the BIOs are
2492 * routed to a thread it is possible for an excessive number to build up
2493 * and cause long front-end stalls long before the runningbuffspace limit
2494 * is hit, so we implement hammer2_flush_pipe to control the
2495 * hysteresis.
2496 *
2497 * This is a particular problem when compression is used.
2498 */
2499 void
2500 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2501 {
2502 atomic_add_int(&pmp->count_lwinprog, 1);
2503 }
2504
2505 void
2506 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2507 {
2508 int lwinprog;
2509
2510 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2511 if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2512 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2513 atomic_clear_int(&pmp->count_lwinprog,
2514 HAMMER2_LWINPROG_WAITING);
2515 wakeup(&pmp->count_lwinprog);
2516 }
2517 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2518 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2519 atomic_clear_int(&pmp->count_lwinprog,
2520 HAMMER2_LWINPROG_WAITING0);
2521 wakeup(&pmp->count_lwinprog);
2522 }
2523 }
2524
2525 void
2526 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2527 {
2528 int lwinprog;
2529 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2530 HAMMER2_LWINPROG_WAITING0;
2531
2532 for (;;) {
2533 lwinprog = pmp->count_lwinprog;
2534 cpu_ccfence();
2535 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2536 break;
2537 tsleep_interlock(&pmp->count_lwinprog, 0);
2538 atomic_set_int(&pmp->count_lwinprog, lwflag);
2539 lwinprog = pmp->count_lwinprog;
2540 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2541 break;
2542 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2543 }
2544 }
2545
2546 /*
2547 * Manage excessive memory resource use for chain and related
2548 * structures.
2549 */
2550 void
2551 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2552 {
2553 uint32_t waiting;
2554 uint32_t count;
2555 uint32_t limit;
2556 #if 0
2557 static int zzticks;
2558 #endif
2559
2560 /*
2561 * Atomic check condition and wait. Also do an early speedup of
2562 * the syncer to try to avoid hitting the wait.
2563 */
2564 for (;;) {
2565 waiting = pmp->inmem_dirty_chains;
2566 cpu_ccfence();
2567 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2568
2569 limit = pmp->mp->mnt_nvnodelistsize / 10;
2570 if (limit < hammer2_limit_dirty_chains)
2571 limit = hammer2_limit_dirty_chains;
2572 if (limit < 1000)
2573 limit = 1000;
2574
2575 #if 0
2576 if ((int)(ticks - zzticks) > hz) {
2577 zzticks = ticks;
2578 kprintf("count %ld %ld\n", count, limit);
2579 }
2580 #endif
2581
2582 /*
2583 * Block if there are too many dirty chains present, wait
2584 * for the flush to clean some out.
2585 */
2586 if (count > limit) {
2587 tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2588 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2589 waiting,
2590 waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2591 speedup_syncer(pmp->mp);
2592 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2593 "chnmem", hz);
2594 }
2595 continue; /* loop on success or fail */
2596 }
2597
2598 /*
2599 * Try to start an early flush before we are forced to block.
2600 */
2601 if (count > limit * 7 / 10)
2602 speedup_syncer(pmp->mp);
2603 break;
2604 }
2605 }
2606
2607 void
2608 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2609 {
2610 if (pmp) {
2611 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2612 }
2613 }
2614
2615 void
2616 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2617 {
2618 uint32_t waiting;
2619
2620 if (pmp == NULL)
2621 return;
2622
2623 for (;;) {
2624 waiting = pmp->inmem_dirty_chains;
2625 cpu_ccfence();
2626 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2627 waiting,
2628 (waiting - 1) &
2629 ~HAMMER2_DIRTYCHAIN_WAITING)) {
2630 break;
2631 }
2632 }
2633
2634 if (waiting & HAMMER2_DIRTYCHAIN_WAITING)
2635 wakeup(&pmp->inmem_dirty_chains);
2636 }
2637
2638 /*
2639 * Debugging
2640 */
2641 void
2642 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx)
2643 {
2644 hammer2_chain_t *scan;
2645 hammer2_chain_t *parent;
2646
2647 --*countp;
2648 if (*countp == 0) {
2649 kprintf("%*.*s...\n", tab, tab, "");
2650 return;
2651 }
2652 if (*countp < 0)
2653 return;
2654 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2655 tab, tab, "", pfx,
2656 chain, chain->bref.type,
2657 chain->bref.key, chain->bref.keybits,
2658 chain->bref.mirror_tid);
2659
2660 kprintf("%*.*s [%08x] (%s) refs=%d",
2661 tab, tab, "",
2662 chain->flags,
2663 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2664 chain->data) ? (char *)chain->data->ipdata.filename : "?"),
2665 chain->refs);
2666
2667 parent = chain->parent;
2668 if (parent)
2669 kprintf("\n%*.*s p=%p [pflags %08x prefs %d",
2670 tab, tab, "",
2671 parent, parent->flags, parent->refs);
2672 if (RB_EMPTY(&chain->core.rbtree)) {
2673 kprintf("\n");
2674 } else {
2675 kprintf(" {\n");
2676 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree)
2677 hammer2_dump_chain(scan, tab + 4, countp, 'a');
2678 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2679 kprintf("%*.*s}(%s)\n", tab, tab, "",
2680 chain->data->ipdata.filename);
2681 else
2682 kprintf("%*.*s}\n", tab, tab, "");
2683 }
2684 }
DragonFly BSD