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hammer2 - Recover errornous lost flag (2)
[dragonfly.git] / sys / vfs / hammer2 / hammer2_vfsops.c
bloba20fb96cb94b75d5dd3e4cf1ba6bd4a379dba876
1 /*
2 * Copyright (c) 2011-2018 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/nlookup.h>
39 #include <sys/vnode.h>
40 #include <sys/mount.h>
41 #include <sys/fcntl.h>
42 #include <sys/buf.h>
43 #include <sys/uuid.h>
44 #include <sys/vfsops.h>
45 #include <sys/sysctl.h>
46 #include <sys/socket.h>
47 #include <sys/objcache.h>
48
49 #include <sys/proc.h>
50 #include <sys/namei.h>
51 #include <sys/mountctl.h>
52 #include <sys/dirent.h>
53 #include <sys/uio.h>
54
55 #include <sys/mutex.h>
56 #include <sys/mutex2.h>
57
58 #include "hammer2.h"
59 #include "hammer2_disk.h"
60 #include "hammer2_mount.h"
61 #include "hammer2_lz4.h"
62
63 #include "zlib/hammer2_zlib.h"
64
65 #define REPORT_REFS_ERRORS 1 /* XXX remove me */
66
67 MALLOC_DEFINE(M_OBJCACHE, "objcache", "Object Cache");
68
69 struct hammer2_sync_info {
70 int error;
71 int waitfor;
72 int pass;
73 };
74
75 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
76 static struct hammer2_mntlist hammer2_mntlist;
77
78 struct hammer2_pfslist hammer2_pfslist;
79 struct hammer2_pfslist hammer2_spmplist;
80 struct lock hammer2_mntlk;
81
82 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT;
83 int hammer2_debug;
84 int hammer2_cluster_meta_read = 1; /* physical read-ahead */
85 int hammer2_cluster_data_read = 4; /* physical read-ahead */
86 int hammer2_dedup_enable = 1;
87 int hammer2_always_compress = 0; /* always try to compress */
88 int hammer2_inval_enable = 0;
89 int hammer2_flush_pipe = 100;
90 int hammer2_dio_count;
91 int hammer2_dio_limit = 256;
92 int hammer2_bulkfree_tps = 5000;
93 long hammer2_chain_allocs;
94 long hammer2_chain_frees;
95 long hammer2_limit_dirty_chains;
96 long hammer2_count_modified_chains;
97 long hammer2_iod_invals;
98 long hammer2_iod_file_read;
99 long hammer2_iod_meta_read;
100 long hammer2_iod_indr_read;
101 long hammer2_iod_fmap_read;
102 long hammer2_iod_volu_read;
103 long hammer2_iod_file_write;
104 long hammer2_iod_file_wembed;
105 long hammer2_iod_file_wzero;
106 long hammer2_iod_file_wdedup;
107 long hammer2_iod_meta_write;
108 long hammer2_iod_indr_write;
109 long hammer2_iod_fmap_write;
110 long hammer2_iod_volu_write;
111
112 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
113 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
114 "Buffer used for compression.");
115
116 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
117 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
118 "Buffer used for decompression.");
119
120 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
121
122 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
123 &hammer2_supported_version, 0, "");
124 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
125 &hammer2_debug, 0, "");
126 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
127 &hammer2_cluster_meta_read, 0, "");
128 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
129 &hammer2_cluster_data_read, 0, "");
130 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
131 &hammer2_dedup_enable, 0, "");
132 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
133 &hammer2_always_compress, 0, "");
134 SYSCTL_INT(_vfs_hammer2, OID_AUTO, inval_enable, CTLFLAG_RW,
135 &hammer2_inval_enable, 0, "");
136 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
137 &hammer2_flush_pipe, 0, "");
138 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
139 &hammer2_bulkfree_tps, 0, "");
140 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RW,
141 &hammer2_chain_allocs, 0, "");
142 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_frees, CTLFLAG_RW,
143 &hammer2_chain_frees, 0, "");
144 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
145 &hammer2_limit_dirty_chains, 0, "");
146 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RW,
147 &hammer2_count_modified_chains, 0, "");
148 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
149 &hammer2_dio_count, 0, "");
150 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
151 &hammer2_dio_limit, 0, "");
152
153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_invals, CTLFLAG_RW,
154 &hammer2_iod_invals, 0, "");
155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
156 &hammer2_iod_file_read, 0, "");
157 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
158 &hammer2_iod_meta_read, 0, "");
159 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
160 &hammer2_iod_indr_read, 0, "");
161 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RW,
162 &hammer2_iod_fmap_read, 0, "");
163 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RW,
164 &hammer2_iod_volu_read, 0, "");
165
166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
167 &hammer2_iod_file_write, 0, "");
168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RW,
169 &hammer2_iod_file_wembed, 0, "");
170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RW,
171 &hammer2_iod_file_wzero, 0, "");
172 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RW,
173 &hammer2_iod_file_wdedup, 0, "");
174 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
175 &hammer2_iod_meta_write, 0, "");
176 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
177 &hammer2_iod_indr_write, 0, "");
178 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RW,
179 &hammer2_iod_fmap_write, 0, "");
180 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
181 &hammer2_iod_volu_write, 0, "");
182
183 long hammer2_process_icrc32;
184 long hammer2_process_xxhash64;
185 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RW,
186 &hammer2_process_icrc32, 0, "");
187 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RW,
188 &hammer2_process_xxhash64, 0, "");
189
190 static int hammer2_vfs_init(struct vfsconf *conf);
191 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
192 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
193 struct ucred *cred);
194 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
195 struct vnode *, struct ucred *);
196 static int hammer2_recovery(hammer2_dev_t *hmp);
197 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
198 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
199 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
200 struct ucred *cred);
201 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
202 struct ucred *cred);
203 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
204 struct fid *fhp, struct vnode **vpp);
205 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
206 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
207 int *exflagsp, struct ucred **credanonp);
208
209 static int hammer2_install_volume_header(hammer2_dev_t *hmp);
210 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
211
212 static void hammer2_update_pmps(hammer2_dev_t *hmp);
213
214 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
215 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
216 hammer2_dev_t *hmp);
217 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
218
219 /*
220 * HAMMER2 vfs operations.
221 */
222 static struct vfsops hammer2_vfsops = {
223 .vfs_init = hammer2_vfs_init,
224 .vfs_uninit = hammer2_vfs_uninit,
225 .vfs_sync = hammer2_vfs_sync,
226 .vfs_mount = hammer2_vfs_mount,
227 .vfs_unmount = hammer2_vfs_unmount,
228 .vfs_root = hammer2_vfs_root,
229 .vfs_statfs = hammer2_vfs_statfs,
230 .vfs_statvfs = hammer2_vfs_statvfs,
231 .vfs_vget = hammer2_vfs_vget,
232 .vfs_vptofh = hammer2_vfs_vptofh,
233 .vfs_fhtovp = hammer2_vfs_fhtovp,
234 .vfs_checkexp = hammer2_vfs_checkexp
235 };
236
237 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
238
239 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
240 MODULE_VERSION(hammer2, 1);
241
242 static
243 int
244 hammer2_vfs_init(struct vfsconf *conf)
245 {
246 static struct objcache_malloc_args margs_read;
247 static struct objcache_malloc_args margs_write;
248 static struct objcache_malloc_args margs_vop;
249
250 int error;
251
252 error = 0;
253
254 /*
255 * A large DIO cache is needed to retain dedup enablement masks.
256 * The bulkfree code clears related masks as part of the disk block
257 * recycling algorithm, preventing it from being used for a later
258 * dedup.
259 *
260 * NOTE: A large buffer cache can actually interfere with dedup
261 * operation because we dedup based on media physical buffers
262 * and not logical buffers. Try to make the DIO case large
263 * enough to avoid this problem, but also cap it.
264 */
265 hammer2_dio_limit = nbuf * 2;
266 if (hammer2_dio_limit > 100000)
267 hammer2_dio_limit = 100000;
268
269 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
270 error = EINVAL;
271 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
272 error = EINVAL;
273 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
274 error = EINVAL;
275
276 if (error)
277 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
278
279 margs_read.objsize = 65536;
280 margs_read.mtype = M_HAMMER2_DEBUFFER;
281
282 margs_write.objsize = 32768;
283 margs_write.mtype = M_HAMMER2_CBUFFER;
284
285 margs_vop.objsize = sizeof(hammer2_xop_t);
286 margs_vop.mtype = M_HAMMER2;
287
288 /*
289 * Note thaht for the XOPS cache we want backing store allocations
290 * to use M_ZERO. This is not allowed in objcache_get() (to avoid
291 * confusion), so use the backing store function that does it. This
292 * means that initial XOPS objects are zerod but REUSED objects are
293 * not. So we are responsible for cleaning the object up sufficiently
294 * for our needs before objcache_put()ing it back (typically just the
295 * FIFO indices).
296 */
297 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
298 0, 1, NULL, NULL, NULL,
299 objcache_malloc_alloc,
300 objcache_malloc_free,
301 &margs_read);
302 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
303 0, 1, NULL, NULL, NULL,
304 objcache_malloc_alloc,
305 objcache_malloc_free,
306 &margs_write);
307 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
308 0, 1, NULL, NULL, NULL,
309 objcache_malloc_alloc_zero,
310 objcache_malloc_free,
311 &margs_vop);
312
313
314 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
315 TAILQ_INIT(&hammer2_mntlist);
316 TAILQ_INIT(&hammer2_pfslist);
317 TAILQ_INIT(&hammer2_spmplist);
318
319 hammer2_limit_dirty_chains = maxvnodes / 10;
320 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
321 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
322
323 return (error);
324 }
325
326 static
327 int
328 hammer2_vfs_uninit(struct vfsconf *vfsp __unused)
329 {
330 objcache_destroy(cache_buffer_read);
331 objcache_destroy(cache_buffer_write);
332 objcache_destroy(cache_xops);
333 return 0;
334 }
335
336 /*
337 * Core PFS allocator. Used to allocate or reference the pmp structure
338 * for PFS cluster mounts and the spmp structure for media (hmp) structures.
339 * The pmp can be passed in or loaded by this function using the chain and
340 * inode data.
341 *
342 * pmp->modify_tid tracks new modify_tid transaction ids for front-end
343 * transactions. Note that synchronization does not use this field.
344 * (typically frontend operations and synchronization cannot run on the
345 * same PFS node at the same time).
346 *
347 * XXX check locking
348 */
349 hammer2_pfs_t *
350 hammer2_pfsalloc(hammer2_chain_t *chain,
351 const hammer2_inode_data_t *ripdata,
352 hammer2_tid_t modify_tid, hammer2_dev_t *force_local)
353 {
354 hammer2_pfs_t *pmp;
355 hammer2_inode_t *iroot;
356 int count;
357 int i;
358 int j;
359
360 pmp = NULL;
361
362 /*
363 * Locate or create the PFS based on the cluster id. If ripdata
364 * is NULL this is a spmp which is unique and is always allocated.
365 *
366 * If the device is mounted in local mode all PFSs are considered
367 * independent and not part of any cluster (for debugging only).
368 */
369 if (ripdata) {
370 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
371 if (force_local != pmp->force_local)
372 continue;
373 if (force_local == NULL &&
374 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
375 sizeof(pmp->pfs_clid)) == 0) {
376 break;
377 } else if (force_local && pmp->pfs_names[0] &&
378 strcmp(pmp->pfs_names[0], ripdata->filename) == 0) {
379 break;
380 }
381 }
382 }
383
384 if (pmp == NULL) {
385 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
386 pmp->force_local = force_local;
387 hammer2_trans_manage_init(pmp);
388 kmalloc_create(&pmp->minode, "HAMMER2-inodes");
389 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
390 lockinit(&pmp->lock, "pfslk", 0, 0);
391 lockinit(&pmp->lock_nlink, "h2nlink", 0, 0);
392 spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
393 spin_init(&pmp->xop_spin, "h2xop");
394 spin_init(&pmp->lru_spin, "h2lru");
395 RB_INIT(&pmp->inum_tree);
396 TAILQ_INIT(&pmp->sideq);
397 TAILQ_INIT(&pmp->lru_list);
398 spin_init(&pmp->list_spin, "hm2pfsalloc_list");
399
400 /*
401 * Distribute backend operations to threads
402 */
403 for (i = 0; i < HAMMER2_XOPGROUPS; ++i)
404 hammer2_xop_group_init(pmp, &pmp->xop_groups[i]);
405
406 /*
407 * Save the last media transaction id for the flusher. Set
408 * initial
409 */
410 if (ripdata) {
411 pmp->pfs_clid = ripdata->meta.pfs_clid;
412 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
413 } else {
414 pmp->flags |= HAMMER2_PMPF_SPMP;
415 TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
416 }
417
418 /*
419 * The synchronization thread may start too early, make
420 * sure it stays frozen until we are ready to let it go.
421 * XXX
422 */
423 /*
424 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
425 HAMMER2_THREAD_REMASTER;
426 */
427 }
428
429 /*
430 * Create the PFS's root inode and any missing XOP helper threads.
431 */
432 if ((iroot = pmp->iroot) == NULL) {
433 iroot = hammer2_inode_get(pmp, NULL, NULL, -1);
434 if (ripdata)
435 iroot->meta = ripdata->meta;
436 pmp->iroot = iroot;
437 hammer2_inode_ref(iroot);
438 hammer2_inode_unlock(iroot);
439 }
440
441 /*
442 * Stop here if no chain is passed in.
443 */
444 if (chain == NULL)
445 goto done;
446
447 /*
448 * When a chain is passed in we must add it to the PFS's root
449 * inode, update pmp->pfs_types[], and update the syncronization
450 * threads.
451 *
452 * When forcing local mode, mark the PFS as a MASTER regardless.
453 *
454 * At the moment empty spots can develop due to removals or failures.
455 * Ultimately we want to re-fill these spots but doing so might
456 * confused running code. XXX
457 */
458 hammer2_inode_ref(iroot);
459 hammer2_mtx_ex(&iroot->lock);
460 j = iroot->cluster.nchains;
461
462 if (j == HAMMER2_MAXCLUSTER) {
463 kprintf("hammer2_mount: cluster full!\n");
464 /* XXX fatal error? */
465 } else {
466 KKASSERT(chain->pmp == NULL);
467 chain->pmp = pmp;
468 hammer2_chain_ref(chain);
469 iroot->cluster.array[j].chain = chain;
470 if (force_local)
471 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
472 else
473 pmp->pfs_types[j] = ripdata->meta.pfs_type;
474 pmp->pfs_names[j] = kstrdup(ripdata->filename, M_HAMMER2);
475 pmp->pfs_hmps[j] = chain->hmp;
476
477 /*
478 * If the PFS is already mounted we must account
479 * for the mount_count here.
480 */
481 if (pmp->mp)
482 ++chain->hmp->mount_count;
483
484 /*
485 * May have to fixup dirty chain tracking. Previous
486 * pmp was NULL so nothing to undo.
487 */
488 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
489 hammer2_pfs_memory_inc(pmp);
490 ++j;
491 }
492 iroot->cluster.nchains = j;
493
494 /*
495 * Update nmasters from any PFS inode which is part of the cluster.
496 * It is possible that this will result in a value which is too
497 * high. MASTER PFSs are authoritative for pfs_nmasters and will
498 * override this value later on.
499 *
500 * (This informs us of masters that might not currently be
501 * discoverable by this mount).
502 */
503 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
504 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
505 }
506
507 /*
508 * Count visible masters. Masters are usually added with
509 * ripdata->meta.pfs_nmasters set to 1. This detects when there
510 * are more (XXX and must update the master inodes).
511 */
512 count = 0;
513 for (i = 0; i < iroot->cluster.nchains; ++i) {
514 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
515 ++count;
516 }
517 if (pmp->pfs_nmasters < count)
518 pmp->pfs_nmasters = count;
519
520 /*
521 * Create missing synchronization and support threads.
522 *
523 * Single-node masters (including snapshots) have nothing to
524 * synchronize and do not require this thread.
525 *
526 * Multi-node masters or any number of soft masters, slaves, copy,
527 * or other PFS types need the thread.
528 *
529 * Each thread is responsible for its particular cluster index.
530 * We use independent threads so stalls or mismatches related to
531 * any given target do not affect other targets.
532 */
533 for (i = 0; i < iroot->cluster.nchains; ++i) {
534 /*
535 * Single-node masters (including snapshots) have nothing
536 * to synchronize and will make direct xops support calls,
537 * thus they do not require this thread.
538 *
539 * Note that there can be thousands of snapshots. We do not
540 * want to create thousands of threads.
541 */
542 if (pmp->pfs_nmasters <= 1 &&
543 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
544 continue;
545 }
546
547 /*
548 * Sync support thread
549 */
550 if (pmp->sync_thrs[i].td == NULL) {
551 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
552 "h2nod", i, -1,
553 hammer2_primary_sync_thread);
554 }
555 }
556
557 /*
558 * Create missing Xop threads
559 *
560 * NOTE: We create helper threads for all mounted PFSs or any
561 * PFSs with 2+ nodes (so the sync thread can update them,
562 * even if not mounted).
563 */
564 if (pmp->mp || iroot->cluster.nchains >= 2)
565 hammer2_xop_helper_create(pmp);
566
567 hammer2_mtx_unlock(&iroot->lock);
568 hammer2_inode_drop(iroot);
569 done:
570 return pmp;
571 }
572
573 /*
574 * Deallocate an element of a probed PFS. If destroying and this is a
575 * MASTER, adjust nmasters.
576 *
577 * This function does not physically destroy the PFS element in its device
578 * under the super-root (see hammer2_ioctl_pfs_delete()).
579 */
580 void
581 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
582 {
583 hammer2_inode_t *iroot;
584 hammer2_chain_t *chain;
585 int j;
586
587 /*
588 * Cleanup our reference on iroot. iroot is (should) not be needed
589 * by the flush code.
590 */
591 iroot = pmp->iroot;
592 if (iroot) {
593 /*
594 * Stop synchronizing
595 *
596 * XXX flush after acquiring the iroot lock.
597 * XXX clean out the cluster index from all inode structures.
598 */
599 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
600
601 /*
602 * Remove the cluster index from the group. If destroying
603 * the PFS and this is a master, adjust pfs_nmasters.
604 */
605 hammer2_mtx_ex(&iroot->lock);
606 chain = iroot->cluster.array[clindex].chain;
607 iroot->cluster.array[clindex].chain = NULL;
608
609 switch(pmp->pfs_types[clindex]) {
610 case HAMMER2_PFSTYPE_MASTER:
611 if (destroying && pmp->pfs_nmasters > 0)
612 --pmp->pfs_nmasters;
613 /* XXX adjust ripdata->meta.pfs_nmasters */
614 break;
615 default:
616 break;
617 }
618 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
619
620 hammer2_mtx_unlock(&iroot->lock);
621
622 /*
623 * Release the chain.
624 */
625 if (chain) {
626 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
627 hammer2_chain_drop(chain);
628 }
629
630 /*
631 * Terminate all XOP threads for the cluster index.
632 */
633 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
634 hammer2_thr_delete(&pmp->xop_groups[j].thrs[clindex]);
635 }
636 }
637
638 /*
639 * Destroy a PFS, typically only occurs after the last mount on a device
640 * has gone away.
641 */
642 static void
643 hammer2_pfsfree(hammer2_pfs_t *pmp)
644 {
645 hammer2_inode_t *iroot;
646 hammer2_chain_t *chain;
647 int i;
648 int j;
649
650 /*
651 * Cleanup our reference on iroot. iroot is (should) not be needed
652 * by the flush code.
653 */
654 if (pmp->flags & HAMMER2_PMPF_SPMP)
655 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
656 else
657 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
658
659 iroot = pmp->iroot;
660 if (iroot) {
661 for (i = 0; i < iroot->cluster.nchains; ++i) {
662 hammer2_thr_delete(&pmp->sync_thrs[i]);
663 for (j = 0; j < HAMMER2_XOPGROUPS; ++j)
664 hammer2_thr_delete(&pmp->xop_groups[j].thrs[i]);
665 }
666 #if REPORT_REFS_ERRORS
667 if (pmp->iroot->refs != 1)
668 kprintf("PMP->IROOT %p REFS WRONG %d\n",
669 pmp->iroot, pmp->iroot->refs);
670 #else
671 KKASSERT(pmp->iroot->refs == 1);
672 #endif
673 /* ref for pmp->iroot */
674 hammer2_inode_drop(pmp->iroot);
675 pmp->iroot = NULL;
676 }
677
678 /*
679 * Cleanup chains remaining on LRU list.
680 */
681 hammer2_spin_ex(&pmp->lru_spin);
682 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
683 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
684 atomic_add_int(&pmp->lru_count, -1);
685 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
686 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
687 hammer2_chain_ref(chain);
688 hammer2_spin_unex(&pmp->lru_spin);
689 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
690 hammer2_chain_drop(chain);
691 hammer2_spin_ex(&pmp->lru_spin);
692 }
693 hammer2_spin_unex(&pmp->lru_spin);
694
695 /*
696 * Free remaining pmp resources
697 */
698 kmalloc_destroy(&pmp->mmsg);
699 kmalloc_destroy(&pmp->minode);
700
701 kfree(pmp, M_HAMMER2);
702 }
703
704 /*
705 * Remove all references to hmp from the pfs list. Any PFS which becomes
706 * empty is terminated and freed.
707 *
708 * XXX inefficient.
709 */
710 static void
711 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
712 {
713 hammer2_pfs_t *pmp;
714 hammer2_inode_t *iroot;
715 hammer2_chain_t *rchain;
716 int didfreeze;
717 int i;
718 int j;
719 struct hammer2_pfslist *wlist;
720
721 if (which == 0)
722 wlist = &hammer2_pfslist;
723 else
724 wlist = &hammer2_spmplist;
725 again:
726 TAILQ_FOREACH(pmp, wlist, mntentry) {
727 if ((iroot = pmp->iroot) == NULL)
728 continue;
729 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
730 hammer2_inode_run_sideq(pmp, 1);
731 hammer2_bioq_sync(pmp);
732 hammer2_trans_done(pmp);
733
734 /*
735 * Determine if this PFS is affected. If it is we must
736 * freeze all management threads and lock its iroot.
737 *
738 * Freezing a management thread forces it idle, operations
739 * in-progress will be aborted and it will have to start
740 * over again when unfrozen, or exit if told to exit.
741 */
742 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
743 if (pmp->pfs_hmps[i] == hmp)
744 break;
745 }
746 if (i != HAMMER2_MAXCLUSTER) {
747 /*
748 * Make sure all synchronization threads are locked
749 * down.
750 */
751 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
752 if (pmp->pfs_hmps[i] == NULL)
753 continue;
754 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
755 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
756 hammer2_thr_freeze_async(
757 &pmp->xop_groups[j].thrs[i]);
758 }
759 }
760 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
761 if (pmp->pfs_hmps[i] == NULL)
762 continue;
763 hammer2_thr_freeze(&pmp->sync_thrs[i]);
764 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
765 hammer2_thr_freeze(
766 &pmp->xop_groups[j].thrs[i]);
767 }
768 }
769
770 /*
771 * Lock the inode and clean out matching chains.
772 * Note that we cannot use hammer2_inode_lock_*()
773 * here because that would attempt to validate the
774 * cluster that we are in the middle of ripping
775 * apart.
776 *
777 * WARNING! We are working directly on the inodes
778 * embedded cluster.
779 */
780 hammer2_mtx_ex(&iroot->lock);
781
782 /*
783 * Remove the chain from matching elements of the PFS.
784 */
785 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
786 if (pmp->pfs_hmps[i] != hmp)
787 continue;
788 hammer2_thr_delete(&pmp->sync_thrs[i]);
789 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
790 hammer2_thr_delete(
791 &pmp->xop_groups[j].thrs[i]);
792 }
793 rchain = iroot->cluster.array[i].chain;
794 iroot->cluster.array[i].chain = NULL;
795 pmp->pfs_types[i] = 0;
796 if (pmp->pfs_names[i]) {
797 kfree(pmp->pfs_names[i], M_HAMMER2);
798 pmp->pfs_names[i] = NULL;
799 }
800 if (rchain) {
801 hammer2_chain_drop(rchain);
802 /* focus hint */
803 if (iroot->cluster.focus == rchain)
804 iroot->cluster.focus = NULL;
805 }
806 pmp->pfs_hmps[i] = NULL;
807 }
808 hammer2_mtx_unlock(&iroot->lock);
809 didfreeze = 1; /* remaster, unfreeze down below */
810 } else {
811 didfreeze = 0;
812 }
813
814 /*
815 * Cleanup trailing chains. Gaps may remain.
816 */
817 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
818 if (pmp->pfs_hmps[i])
819 break;
820 }
821 iroot->cluster.nchains = i + 1;
822
823 /*
824 * If the PMP has no elements remaining we can destroy it.
825 * (this will transition management threads from frozen->exit).
826 */
827 if (iroot->cluster.nchains == 0) {
828 /*
829 * If this was the hmp's spmp, we need to clean
830 * a little more stuff out.
831 */
832 if (hmp->spmp == pmp) {
833 hmp->spmp = NULL;
834 hmp->vchain.pmp = NULL;
835 hmp->fchain.pmp = NULL;
836 }
837
838 /*
839 * Free the pmp and restart the loop
840 */
841 hammer2_pfsfree(pmp);
842 goto again;
843 }
844
845 /*
846 * If elements still remain we need to set the REMASTER
847 * flag and unfreeze it.
848 */
849 if (didfreeze) {
850 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
851 if (pmp->pfs_hmps[i] == NULL)
852 continue;
853 hammer2_thr_remaster(&pmp->sync_thrs[i]);
854 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
855 for (j = 0; j < HAMMER2_XOPGROUPS; ++j) {
856 hammer2_thr_remaster(
857 &pmp->xop_groups[j].thrs[i]);
858 hammer2_thr_unfreeze(
859 &pmp->xop_groups[j].thrs[i]);
860 }
861 }
862 }
863 }
864 }
865
866 /*
867 * Mount or remount HAMMER2 fileystem from physical media
868 *
869 * mountroot
870 * mp mount point structure
871 * path NULL
872 * data <unused>
873 * cred <unused>
874 *
875 * mount
876 * mp mount point structure
877 * path path to mount point
878 * data pointer to argument structure in user space
879 * volume volume path (device@LABEL form)
880 * hflags user mount flags
881 * cred user credentials
882 *
883 * RETURNS: 0 Success
884 * !0 error number
885 */
886 static
887 int
888 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
889 struct ucred *cred)
890 {
891 struct hammer2_mount_info info;
892 hammer2_pfs_t *pmp;
893 hammer2_pfs_t *spmp;
894 hammer2_dev_t *hmp;
895 hammer2_dev_t *force_local;
896 hammer2_key_t key_next;
897 hammer2_key_t key_dummy;
898 hammer2_key_t lhc;
899 struct vnode *devvp;
900 struct nlookupdata nd;
901 hammer2_chain_t *parent;
902 hammer2_chain_t *chain;
903 hammer2_cluster_t *cluster;
904 const hammer2_inode_data_t *ripdata;
905 hammer2_blockref_t bref;
906 struct file *fp;
907 char devstr[MNAMELEN];
908 size_t size;
909 size_t done;
910 char *dev;
911 char *label;
912 int ronly = 1;
913 int error;
914 int i;
915
916 hmp = NULL;
917 pmp = NULL;
918 dev = NULL;
919 label = NULL;
920 devvp = NULL;
921
922 kprintf("hammer2_mount\n");
923
924 if (path == NULL) {
925 /*
926 * Root mount
927 */
928 bzero(&info, sizeof(info));
929 info.cluster_fd = -1;
930 ksnprintf(devstr, sizeof(devstr), "%s",
931 mp->mnt_stat.f_mntfromname);
932 kprintf("hammer2_mount: root '%s'\n", devstr);
933 } else {
934 /*
935 * Non-root mount or updating a mount
936 */
937 error = copyin(data, &info, sizeof(info));
938 if (error)
939 return (error);
940
941 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
942 if (error)
943 return (error);
944 }
945
946 /*
947 * Extract device and label, automatically mount @BOOT, @ROOT, or @DATA
948 * if no label specified, based on the partition id. Error out if no
949 * label or device (with partition id) is specified. This is strictly
950 * a convenience to match the default label created by newfs_hammer2,
951 * our preference is that a label always be specified.
952 *
953 * NOTE: We allow 'mount @LABEL <blah>'... that is, a mount command
954 * that does not specify a device, as long as some H2 label
955 * has already been mounted from that device. This makes
956 * mounting snapshots a lot easier.
957 */
958 dev = devstr;
959 label = strchr(devstr, '@');
960 if (label && ((label + 1) - dev) > done)
961 return (EINVAL);
962 if (label == NULL || label[1] == 0) {
963 char slice;
964
965 if (label == NULL)
966 label = devstr + strlen(devstr);
967 slice = label[-1];
968 switch(slice) {
969 case 'a':
970 label = "BOOT";
971 break;
972 case 'd':
973 label = "ROOT";
974 break;
975 default:
976 label = "DATA";
977 break;
978 }
979 } else {
980 *label = '\0';
981 label++;
982 }
983
984 kprintf("hammer2_mount: dev=\"%s\" label=\"%s\" rdonly=%d\n",
985 dev, label, (mp->mnt_flag & MNT_RDONLY));
986
987 if (mp->mnt_flag & MNT_UPDATE) {
988 /*
989 * Update mount. Note that pmp->iroot->cluster is
990 * an inode-embedded cluster and thus cannot be
991 * directly locked.
992 *
993 * XXX HAMMER2 needs to implement NFS export via
994 * mountctl.
995 */
996 pmp = MPTOPMP(mp);
997 pmp->hflags = info.hflags;
998 cluster = &pmp->iroot->cluster;
999 for (i = 0; i < cluster->nchains; ++i) {
1000 if (cluster->array[i].chain == NULL)
1001 continue;
1002 hmp = cluster->array[i].chain->hmp;
1003 devvp = hmp->devvp;
1004 error = hammer2_remount(hmp, mp, path,
1005 devvp, cred);
1006 if (error)
1007 break;
1008 }
1009
1010 return error;
1011 }
1012
1013 /*
1014 * HMP device mount
1015 *
1016 * If a path is specified and dev is not an empty string, lookup the
1017 * name and verify that it referes to a block device.
1018 *
1019 * If a path is specified and dev is an empty string we fall through
1020 * and locate the label in the hmp search.
1021 */
1022 if (path && *dev != 0) {
1023 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
1024 if (error == 0)
1025 error = nlookup(&nd);
1026 if (error == 0)
1027 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
1028 nlookup_done(&nd);
1029 } else if (path == NULL) {
1030 /* root mount */
1031 cdev_t cdev = kgetdiskbyname(dev);
1032 error = bdevvp(cdev, &devvp);
1033 if (error)
1034 kprintf("hammer2: cannot find '%s'\n", dev);
1035 } else {
1036 /*
1037 * We will locate the hmp using the label in the hmp loop.
1038 */
1039 error = 0;
1040 }
1041
1042 /*
1043 * Make sure its a block device. Do not check to see if it is
1044 * already mounted until we determine that its a fresh H2 device.
1045 */
1046 if (error == 0 && devvp) {
1047 vn_isdisk(devvp, &error);
1048 }
1049
1050 /*
1051 * Determine if the device has already been mounted. After this
1052 * check hmp will be non-NULL if we are doing the second or more
1053 * hammer2 mounts from the same device.
1054 */
1055 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1056 if (devvp) {
1057 /*
1058 * Match the device. Due to the way devfs works,
1059 * we may not be able to directly match the vnode pointer,
1060 * so also check to see if the underlying device matches.
1061 */
1062 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1063 if (hmp->devvp == devvp)
1064 break;
1065 if (devvp->v_rdev &&
1066 hmp->devvp->v_rdev == devvp->v_rdev) {
1067 break;
1068 }
1069 }
1070
1071 /*
1072 * If no match this may be a fresh H2 mount, make sure
1073 * the device is not mounted on anything else.
1074 */
1075 if (hmp == NULL)
1076 error = vfs_mountedon(devvp);
1077 } else if (error == 0) {
1078 /*
1079 * Match the label to a pmp already probed.
1080 */
1081 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1082 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1083 if (pmp->pfs_names[i] &&
1084 strcmp(pmp->pfs_names[i], label) == 0) {
1085 hmp = pmp->pfs_hmps[i];
1086 break;
1087 }
1088 }
1089 if (hmp)
1090 break;
1091 }
1092 if (hmp == NULL)
1093 error = ENOENT;
1094 }
1095
1096 /*
1097 * Open the device if this isn't a secondary mount and construct
1098 * the H2 device mount (hmp).
1099 */
1100 if (hmp == NULL) {
1101 hammer2_chain_t *schain;
1102 hammer2_xid_t xid;
1103
1104 if (error == 0 && vcount(devvp) > 0) {
1105 kprintf("Primary device already has references\n");
1106 error = EBUSY;
1107 }
1108
1109 /*
1110 * Now open the device
1111 */
1112 if (error == 0) {
1113 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
1114 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1115 error = vinvalbuf(devvp, V_SAVE, 0, 0);
1116 if (error == 0) {
1117 error = VOP_OPEN(devvp,
1118 (ronly ? FREAD : FREAD | FWRITE),
1119 FSCRED, NULL);
1120 }
1121 vn_unlock(devvp);
1122 }
1123 if (error && devvp) {
1124 vrele(devvp);
1125 devvp = NULL;
1126 }
1127 if (error) {
1128 lockmgr(&hammer2_mntlk, LK_RELEASE);
1129 return error;
1130 }
1131 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1132 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", dev);
1133 hmp->ronly = ronly;
1134 hmp->devvp = devvp;
1135 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1136 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
1137 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1138 RB_INIT(&hmp->iotree);
1139 spin_init(&hmp->io_spin, "hm2mount_io");
1140 spin_init(&hmp->list_spin, "hm2mount_list");
1141 TAILQ_INIT(&hmp->flushq);
1142
1143 lockinit(&hmp->vollk, "h2vol", 0, 0);
1144 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1145 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1146
1147 /*
1148 * vchain setup. vchain.data is embedded.
1149 * vchain.refs is initialized and will never drop to 0.
1150 *
1151 * NOTE! voldata is not yet loaded.
1152 */
1153 hmp->vchain.hmp = hmp;
1154 hmp->vchain.refs = 1;
1155 hmp->vchain.data = (void *)&hmp->voldata;
1156 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1157 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1158 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1159
1160 hammer2_chain_core_init(&hmp->vchain);
1161 /* hmp->vchain.u.xxx is left NULL */
1162
1163 /*
1164 * fchain setup. fchain.data is embedded.
1165 * fchain.refs is initialized and will never drop to 0.
1166 *
1167 * The data is not used but needs to be initialized to
1168 * pass assertion muster. We use this chain primarily
1169 * as a placeholder for the freemap's top-level RBTREE
1170 * so it does not interfere with the volume's topology
1171 * RBTREE.
1172 */
1173 hmp->fchain.hmp = hmp;
1174 hmp->fchain.refs = 1;
1175 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1176 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1177 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1178 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1179 hmp->fchain.bref.methods =
1180 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1181 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1182
1183 hammer2_chain_core_init(&hmp->fchain);
1184 /* hmp->fchain.u.xxx is left NULL */
1185
1186 /*
1187 * Install the volume header and initialize fields from
1188 * voldata.
1189 */
1190 error = hammer2_install_volume_header(hmp);
1191 if (error) {
1192 hammer2_unmount_helper(mp, NULL, hmp);
1193 lockmgr(&hammer2_mntlk, LK_RELEASE);
1194 hammer2_vfs_unmount(mp, MNT_FORCE);
1195 return error;
1196 }
1197
1198 /*
1199 * Really important to get these right or flush will get
1200 * confused.
1201 */
1202 hmp->spmp = hammer2_pfsalloc(NULL, NULL, 0, NULL);
1203 spmp = hmp->spmp;
1204
1205 /*
1206 * Dummy-up vchain and fchain's modify_tid. mirror_tid
1207 * is inherited from the volume header.
1208 */
1209 xid = 0;
1210 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1211 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1212 hmp->vchain.pmp = spmp;
1213 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1214 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1215 hmp->fchain.pmp = spmp;
1216
1217 /*
1218 * First locate the super-root inode, which is key 0
1219 * relative to the volume header's blockset.
1220 *
1221 * Then locate the root inode by scanning the directory keyspace
1222 * represented by the label.
1223 */
1224 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1225 schain = hammer2_chain_lookup(&parent, &key_dummy,
1226 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1227 &error, 0);
1228 hammer2_chain_lookup_done(parent);
1229 if (schain == NULL) {
1230 kprintf("hammer2_mount: invalid super-root\n");
1231 hammer2_unmount_helper(mp, NULL, hmp);
1232 lockmgr(&hammer2_mntlk, LK_RELEASE);
1233 hammer2_vfs_unmount(mp, MNT_FORCE);
1234 return EINVAL;
1235 }
1236 if (schain->error) {
1237 kprintf("hammer2_mount: error %s reading super-root\n",
1238 hammer2_error_str(schain->error));
1239 hammer2_chain_unlock(schain);
1240 hammer2_chain_drop(schain);
1241 schain = NULL;
1242 hammer2_unmount_helper(mp, NULL, hmp);
1243 lockmgr(&hammer2_mntlk, LK_RELEASE);
1244 hammer2_vfs_unmount(mp, MNT_FORCE);
1245 return EINVAL;
1246 }
1247
1248 /*
1249 * The super-root always uses an inode_tid of 1 when
1250 * creating PFSs.
1251 */
1252 spmp->inode_tid = 1;
1253 spmp->modify_tid = schain->bref.modify_tid + 1;
1254
1255 /*
1256 * Sanity-check schain's pmp and finish initialization.
1257 * Any chain belonging to the super-root topology should
1258 * have a NULL pmp (not even set to spmp).
1259 */
1260 ripdata = &hammer2_chain_rdata(schain)->ipdata;
1261 KKASSERT(schain->pmp == NULL);
1262 spmp->pfs_clid = ripdata->meta.pfs_clid;
1263
1264 /*
1265 * Replace the dummy spmp->iroot with a real one. It's
1266 * easier to just do a wholesale replacement than to try
1267 * to update the chain and fixup the iroot fields.
1268 *
1269 * The returned inode is locked with the supplied cluster.
1270 */
1271 cluster = hammer2_cluster_from_chain(schain);
1272 hammer2_inode_drop(spmp->iroot);
1273 spmp->iroot = NULL;
1274 spmp->iroot = hammer2_inode_get(spmp, NULL, cluster, -1);
1275 spmp->spmp_hmp = hmp;
1276 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1277 spmp->pfs_hmps[0] = hmp;
1278 hammer2_inode_ref(spmp->iroot);
1279 hammer2_inode_unlock(spmp->iroot);
1280 hammer2_cluster_unlock(cluster);
1281 hammer2_cluster_drop(cluster);
1282 schain = NULL;
1283 /* leave spmp->iroot with one ref */
1284
1285 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1286 error = hammer2_recovery(hmp);
1287 if (error == 0)
1288 error |= hammer2_fixup_pfses(hmp);
1289 /* XXX do something with error */
1290 }
1291 hammer2_update_pmps(hmp);
1292 hammer2_iocom_init(hmp);
1293 hammer2_bulkfree_init(hmp);
1294
1295 /*
1296 * Ref the cluster management messaging descriptor. The mount
1297 * program deals with the other end of the communications pipe.
1298 *
1299 * Root mounts typically do not supply one.
1300 */
1301 if (info.cluster_fd >= 0) {
1302 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
1303 if (fp) {
1304 hammer2_cluster_reconnect(hmp, fp);
1305 } else {
1306 kprintf("hammer2_mount: bad cluster_fd!\n");
1307 }
1308 }
1309 } else {
1310 spmp = hmp->spmp;
1311 if (info.hflags & HMNT2_DEVFLAGS) {
1312 kprintf("hammer2: Warning: mount flags pertaining "
1313 "to the whole device may only be specified "
1314 "on the first mount of the device: %08x\n",
1315 info.hflags & HMNT2_DEVFLAGS);
1316 }
1317 }
1318
1319 /*
1320 * Force local mount (disassociate all PFSs from their clusters).
1321 * Used primarily for debugging.
1322 */
1323 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1324
1325 /*
1326 * Lookup the mount point under the media-localized super-root.
1327 * Scanning hammer2_pfslist doesn't help us because it represents
1328 * PFS cluster ids which can aggregate several named PFSs together.
1329 *
1330 * cluster->pmp will incorrectly point to spmp and must be fixed
1331 * up later on.
1332 */
1333 hammer2_inode_lock(spmp->iroot, 0);
1334 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1335 lhc = hammer2_dirhash(label, strlen(label));
1336 chain = hammer2_chain_lookup(&parent, &key_next,
1337 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1338 &error, 0);
1339 while (chain) {
1340 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1341 strcmp(label, chain->data->ipdata.filename) == 0) {
1342 break;
1343 }
1344 chain = hammer2_chain_next(&parent, chain, &key_next,
1345 key_next,
1346 lhc + HAMMER2_DIRHASH_LOMASK,
1347 &error, 0);
1348 }
1349 if (parent) {
1350 hammer2_chain_unlock(parent);
1351 hammer2_chain_drop(parent);
1352 }
1353 hammer2_inode_unlock(spmp->iroot);
1354
1355 /*
1356 * PFS could not be found?
1357 */
1358 if (chain == NULL) {
1359 if (error)
1360 kprintf("hammer2_mount: PFS label I/O error\n");
1361 else
1362 kprintf("hammer2_mount: PFS label not found\n");
1363 hammer2_unmount_helper(mp, NULL, hmp);
1364 lockmgr(&hammer2_mntlk, LK_RELEASE);
1365 hammer2_vfs_unmount(mp, MNT_FORCE);
1366
1367 return EINVAL;
1368 }
1369
1370 /*
1371 * Acquire the pmp structure (it should have already been allocated
1372 * via hammer2_update_pmps() so do not pass cluster in to add to
1373 * available chains).
1374 *
1375 * Check if the cluster has already been mounted. A cluster can
1376 * only be mounted once, use null mounts to mount additional copies.
1377 */
1378 if (chain->error) {
1379 kprintf("hammer2_mount: PFS label I/O error\n");
1380 } else {
1381 ripdata = &chain->data->ipdata;
1382 bref = chain->bref;
1383 pmp = hammer2_pfsalloc(NULL, ripdata,
1384 bref.modify_tid, force_local);
1385 }
1386 hammer2_chain_unlock(chain);
1387 hammer2_chain_drop(chain);
1388
1389 /*
1390 * Finish the mount
1391 */
1392 kprintf("hammer2_mount hmp=%p pmp=%p\n", hmp, pmp);
1393
1394 if (pmp->mp) {
1395 kprintf("hammer2_mount: PFS already mounted!\n");
1396 hammer2_unmount_helper(mp, NULL, hmp);
1397 lockmgr(&hammer2_mntlk, LK_RELEASE);
1398 hammer2_vfs_unmount(mp, MNT_FORCE);
1399
1400 return EBUSY;
1401 }
1402
1403 pmp->hflags = info.hflags;
1404 mp->mnt_flag |= MNT_LOCAL;
1405 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
1406 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
1407
1408 /*
1409 * required mount structure initializations
1410 */
1411 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1412 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1413
1414 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1415 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1416
1417 /*
1418 * Optional fields
1419 */
1420 mp->mnt_iosize_max = MAXPHYS;
1421
1422 /*
1423 * Connect up mount pointers.
1424 */
1425 hammer2_mount_helper(mp, pmp);
1426
1427 lockmgr(&hammer2_mntlk, LK_RELEASE);
1428
1429 /*
1430 * Finish setup
1431 */
1432 vfs_getnewfsid(mp);
1433 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1434 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1435 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1436
1437 if (path) {
1438 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1439 MNAMELEN - 1, &size);
1440 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1441 } /* else root mount, already in there */
1442
1443 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1444 if (path) {
1445 copyinstr(path, mp->mnt_stat.f_mntonname,
1446 sizeof(mp->mnt_stat.f_mntonname) - 1,
1447 &size);
1448 } else {
1449 /* root mount */
1450 mp->mnt_stat.f_mntonname[0] = '/';
1451 }
1452
1453 /*
1454 * Initial statfs to prime mnt_stat.
1455 */
1456 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
1457
1458 return 0;
1459 }
1460
1461 /*
1462 * Scan PFSs under the super-root and create hammer2_pfs structures.
1463 */
1464 static
1465 void
1466 hammer2_update_pmps(hammer2_dev_t *hmp)
1467 {
1468 const hammer2_inode_data_t *ripdata;
1469 hammer2_chain_t *parent;
1470 hammer2_chain_t *chain;
1471 hammer2_blockref_t bref;
1472 hammer2_dev_t *force_local;
1473 hammer2_pfs_t *spmp;
1474 hammer2_pfs_t *pmp;
1475 hammer2_key_t key_next;
1476 int error;
1477
1478 /*
1479 * Force local mount (disassociate all PFSs from their clusters).
1480 * Used primarily for debugging.
1481 */
1482 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1483
1484 /*
1485 * Lookup mount point under the media-localized super-root.
1486 *
1487 * cluster->pmp will incorrectly point to spmp and must be fixed
1488 * up later on.
1489 */
1490 spmp = hmp->spmp;
1491 hammer2_inode_lock(spmp->iroot, 0);
1492 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1493 chain = hammer2_chain_lookup(&parent, &key_next,
1494 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1495 &error, 0);
1496 while (chain) {
1497 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
1498 continue;
1499 if (chain->error) {
1500 kprintf("I/O error scanning PFS labels\n");
1501 } else {
1502 ripdata = &chain->data->ipdata;
1503 bref = chain->bref;
1504
1505 pmp = hammer2_pfsalloc(chain, ripdata,
1506 bref.modify_tid, force_local);
1507 }
1508 chain = hammer2_chain_next(&parent, chain, &key_next,
1509 key_next, HAMMER2_KEY_MAX,
1510 &error, 0);
1511 }
1512 if (parent) {
1513 hammer2_chain_unlock(parent);
1514 hammer2_chain_drop(parent);
1515 }
1516 hammer2_inode_unlock(spmp->iroot);
1517 }
1518
1519 static
1520 int
1521 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1522 struct vnode *devvp, struct ucred *cred)
1523 {
1524 int error;
1525
1526 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
1527 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1528 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1529 vn_unlock(devvp);
1530 error = hammer2_recovery(hmp);
1531 if (error == 0)
1532 error |= hammer2_fixup_pfses(hmp);
1533 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1534 if (error == 0) {
1535 VOP_CLOSE(devvp, FREAD, NULL);
1536 hmp->ronly = 0;
1537 } else {
1538 VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1539 }
1540 vn_unlock(devvp);
1541 } else {
1542 error = 0;
1543 }
1544 return error;
1545 }
1546
1547 static
1548 int
1549 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1550 {
1551 hammer2_pfs_t *pmp;
1552 int flags;
1553 int error = 0;
1554
1555 pmp = MPTOPMP(mp);
1556
1557 if (pmp == NULL)
1558 return(0);
1559
1560 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1561
1562 /*
1563 * If mount initialization proceeded far enough we must flush
1564 * its vnodes and sync the underlying mount points. Three syncs
1565 * are required to fully flush the filesystem (freemap updates lag
1566 * by one flush, and one extra for safety).
1567 */
1568 if (mntflags & MNT_FORCE)
1569 flags = FORCECLOSE;
1570 else
1571 flags = 0;
1572 if (pmp->iroot) {
1573 error = vflush(mp, 0, flags);
1574 if (error)
1575 goto failed;
1576 hammer2_vfs_sync(mp, MNT_WAIT);
1577 hammer2_vfs_sync(mp, MNT_WAIT);
1578 hammer2_vfs_sync(mp, MNT_WAIT);
1579 }
1580
1581 /*
1582 * Cleanup the frontend support XOPS threads
1583 */
1584 hammer2_xop_helper_cleanup(pmp);
1585
1586 if (pmp->mp)
1587 hammer2_unmount_helper(mp, pmp, NULL);
1588
1589 error = 0;
1590 failed:
1591 lockmgr(&hammer2_mntlk, LK_RELEASE);
1592
1593 return (error);
1594 }
1595
1596 /*
1597 * Mount helper, hook the system mount into our PFS.
1598 * The mount lock is held.
1599 *
1600 * We must bump the mount_count on related devices for any
1601 * mounted PFSs.
1602 */
1603 static
1604 void
1605 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1606 {
1607 hammer2_cluster_t *cluster;
1608 hammer2_chain_t *rchain;
1609 int i;
1610
1611 mp->mnt_data = (qaddr_t)pmp;
1612 pmp->mp = mp;
1613
1614 /*
1615 * After pmp->mp is set we have to adjust hmp->mount_count.
1616 */
1617 cluster = &pmp->iroot->cluster;
1618 for (i = 0; i < cluster->nchains; ++i) {
1619 rchain = cluster->array[i].chain;
1620 if (rchain == NULL)
1621 continue;
1622 ++rchain->hmp->mount_count;
1623 }
1624
1625 /*
1626 * Create missing Xop threads
1627 */
1628 hammer2_xop_helper_create(pmp);
1629 }
1630
1631 /*
1632 * Mount helper, unhook the system mount from our PFS.
1633 * The mount lock is held.
1634 *
1635 * If hmp is supplied a mount responsible for being the first to open
1636 * the block device failed and the block device and all PFSs using the
1637 * block device must be cleaned up.
1638 *
1639 * If pmp is supplied multiple devices might be backing the PFS and each
1640 * must be disconnected. This might not be the last PFS using some of the
1641 * underlying devices. Also, we have to adjust our hmp->mount_count
1642 * accounting for the devices backing the pmp which is now undergoing an
1643 * unmount.
1644 */
1645 static
1646 void
1647 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1648 {
1649 hammer2_cluster_t *cluster;
1650 hammer2_chain_t *rchain;
1651 struct vnode *devvp;
1652 int dumpcnt;
1653 int ronly;
1654 int i;
1655
1656 /*
1657 * If no device supplied this is a high-level unmount and we have to
1658 * to disconnect the mount, adjust mount_count, and locate devices
1659 * that might now have no mounts.
1660 */
1661 if (pmp) {
1662 KKASSERT(hmp == NULL);
1663 KKASSERT((void *)(intptr_t)mp->mnt_data == pmp);
1664 pmp->mp = NULL;
1665 mp->mnt_data = NULL;
1666
1667 /*
1668 * After pmp->mp is cleared we have to account for
1669 * mount_count.
1670 */
1671 cluster = &pmp->iroot->cluster;
1672 for (i = 0; i < cluster->nchains; ++i) {
1673 rchain = cluster->array[i].chain;
1674 if (rchain == NULL)
1675 continue;
1676 --rchain->hmp->mount_count;
1677 /* scrapping hmp now may invalidate the pmp */
1678 }
1679 again:
1680 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1681 if (hmp->mount_count == 0) {
1682 hammer2_unmount_helper(NULL, NULL, hmp);
1683 goto again;
1684 }
1685 }
1686 return;
1687 }
1688
1689 /*
1690 * Try to terminate the block device. We can't terminate it if
1691 * there are still PFSs referencing it.
1692 */
1693 if (hmp->mount_count)
1694 return;
1695
1696 /*
1697 * Decomission the network before we start messing with the
1698 * device and PFS.
1699 */
1700 hammer2_iocom_uninit(hmp);
1701
1702 hammer2_bulkfree_uninit(hmp);
1703 hammer2_pfsfree_scan(hmp, 0);
1704 hammer2_dev_exlock(hmp); /* XXX order */
1705
1706 /*
1707 * Cycle the volume data lock as a safety (probably not needed any
1708 * more). To ensure everything is out we need to flush at least
1709 * three times. (1) The running of the sideq can dirty the
1710 * filesystem, (2) A normal flush can dirty the freemap, and
1711 * (3) ensure that the freemap is fully synchronized.
1712 *
1713 * The next mount's recovery scan can clean everything up but we want
1714 * to leave the filesystem in a 100% clean state on a normal unmount.
1715 */
1716 #if 0
1717 hammer2_voldata_lock(hmp);
1718 hammer2_voldata_unlock(hmp);
1719 #endif
1720
1721 /*
1722 * Flush whatever is left. Unmounted but modified PFS's might still
1723 * have some dirty chains on them.
1724 */
1725 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1726 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1727
1728 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1729 hammer2_voldata_modify(hmp);
1730 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1731 HAMMER2_FLUSH_ALL);
1732 }
1733 hammer2_chain_unlock(&hmp->fchain);
1734
1735 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1736 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1737 HAMMER2_FLUSH_ALL);
1738 }
1739 hammer2_chain_unlock(&hmp->vchain);
1740
1741 if ((hmp->vchain.flags | hmp->fchain.flags) &
1742 HAMMER2_CHAIN_FLUSH_MASK) {
1743 kprintf("hammer2_unmount: chains left over "
1744 "after final sync\n");
1745 kprintf(" vchain %08x\n", hmp->vchain.flags);
1746 kprintf(" fchain %08x\n", hmp->fchain.flags);
1747
1748 if (hammer2_debug & 0x0010)
1749 Debugger("entered debugger");
1750 }
1751
1752 hammer2_pfsfree_scan(hmp, 1);
1753
1754 KKASSERT(hmp->spmp == NULL);
1755
1756 /*
1757 * Finish up with the device vnode
1758 */
1759 if ((devvp = hmp->devvp) != NULL) {
1760 ronly = hmp->ronly;
1761 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1762 kprintf("hammer2_unmount(A): devvp %s rbdirty %p ronly=%d\n",
1763 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree),
1764 ronly);
1765 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
1766 kprintf("hammer2_unmount(B): devvp %s rbdirty %p\n",
1767 hmp->devrepname, RB_ROOT(&devvp->v_rbdirty_tree));
1768 hmp->devvp = NULL;
1769 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE), NULL);
1770 vn_unlock(devvp);
1771 vrele(devvp);
1772 devvp = NULL;
1773 }
1774
1775 /*
1776 * Clear vchain/fchain flags that might prevent final cleanup
1777 * of these chains.
1778 */
1779 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1780 atomic_add_long(&hammer2_count_modified_chains, -1);
1781 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1782 hammer2_pfs_memory_wakeup(hmp->vchain.pmp);
1783 }
1784 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1785 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1786 }
1787
1788 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1789 atomic_add_long(&hammer2_count_modified_chains, -1);
1790 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1791 hammer2_pfs_memory_wakeup(hmp->fchain.pmp);
1792 }
1793 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1794 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1795 }
1796
1797 /*
1798 * Final drop of embedded freemap root chain to
1799 * clean up fchain.core (fchain structure is not
1800 * flagged ALLOCATED so it is cleaned out and then
1801 * left to rot).
1802 */
1803 hammer2_chain_drop(&hmp->fchain);
1804
1805 /*
1806 * Final drop of embedded volume root chain to clean
1807 * up vchain.core (vchain structure is not flagged
1808 * ALLOCATED so it is cleaned out and then left to
1809 * rot).
1810 */
1811 dumpcnt = 50;
1812 hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt, 'v', (u_int)-1);
1813 dumpcnt = 50;
1814 hammer2_dump_chain(&hmp->fchain, 0, &dumpcnt, 'f', (u_int)-1);
1815 hammer2_dev_unlock(hmp);
1816 hammer2_chain_drop(&hmp->vchain);
1817
1818 hammer2_io_cleanup(hmp, &hmp->iotree);
1819 if (hmp->iofree_count) {
1820 kprintf("io_cleanup: %d I/O's left hanging\n",
1821 hmp->iofree_count);
1822 }
1823
1824 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1825 kmalloc_destroy(&hmp->mchain);
1826 kfree(hmp, M_HAMMER2);
1827 }
1828
1829 int
1830 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
1831 ino_t ino, struct vnode **vpp)
1832 {
1833 hammer2_xop_lookup_t *xop;
1834 hammer2_pfs_t *pmp;
1835 hammer2_inode_t *ip;
1836 hammer2_tid_t inum;
1837 int error;
1838
1839 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1840
1841 error = 0;
1842 pmp = MPTOPMP(mp);
1843
1844 /*
1845 * Easy if we already have it cached
1846 */
1847 ip = hammer2_inode_lookup(pmp, inum);
1848 if (ip) {
1849 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1850 *vpp = hammer2_igetv(ip, &error);
1851 hammer2_inode_unlock(ip);
1852 hammer2_inode_drop(ip); /* from lookup */
1853
1854 return error;
1855 }
1856
1857 /*
1858 * Otherwise we have to find the inode
1859 */
1860 xop = hammer2_xop_alloc(pmp->iroot, 0);
1861 xop->lhc = inum;
1862 hammer2_xop_start(&xop->head, hammer2_xop_lookup);
1863 error = hammer2_xop_collect(&xop->head, 0);
1864
1865 if (error == 0) {
1866 if (hammer2_cluster_rdata(&xop->head.cluster) == NULL) {
1867 kprintf("vget: no collect error but also no rdata\n");
1868 kprintf("xop %p\n", xop);
1869 while ((hammer2_debug & 0x80000) == 0) {
1870 tsleep(xop, PCATCH, "wait", hz * 10);
1871 }
1872 ip = NULL;
1873 } else {
1874 ip = hammer2_inode_get(pmp, NULL, &xop->head.cluster, -1);
1875 }
1876 }
1877 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1878
1879 if (ip) {
1880 *vpp = hammer2_igetv(ip, &error);
1881 hammer2_inode_unlock(ip);
1882 } else {
1883 *vpp = NULL;
1884 error = ENOENT;
1885 }
1886 return (error);
1887 }
1888
1889 static
1890 int
1891 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
1892 {
1893 hammer2_pfs_t *pmp;
1894 struct vnode *vp;
1895 int error;
1896
1897 pmp = MPTOPMP(mp);
1898 if (pmp->iroot == NULL) {
1899 *vpp = NULL;
1900 return EINVAL;
1901 }
1902
1903 error = 0;
1904 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1905
1906 while (pmp->inode_tid == 0) {
1907 hammer2_xop_ipcluster_t *xop;
1908 hammer2_inode_meta_t *meta;
1909
1910 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1911 hammer2_xop_start(&xop->head, hammer2_xop_ipcluster);
1912 error = hammer2_xop_collect(&xop->head, 0);
1913
1914 if (error == 0) {
1915 meta = &xop->head.cluster.focus->data->ipdata.meta;
1916 pmp->iroot->meta = *meta;
1917 pmp->inode_tid = meta->pfs_inum + 1;
1918 if (pmp->inode_tid < HAMMER2_INODE_START)
1919 pmp->inode_tid = HAMMER2_INODE_START;
1920 pmp->modify_tid =
1921 xop->head.cluster.focus->bref.modify_tid + 1;
1922 #if 0
1923 kprintf("PFS: Starting inode %jd\n",
1924 (intmax_t)pmp->inode_tid);
1925 kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1926 pmp->inode_tid, pmp->modify_tid);
1927 #endif
1928 wakeup(&pmp->iroot);
1929
1930 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1931
1932 /*
1933 * Prime the mount info.
1934 */
1935 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1936 break;
1937 }
1938
1939 /*
1940 * Loop, try again
1941 */
1942 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1943 hammer2_inode_unlock(pmp->iroot);
1944 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1945 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1946 if (error == EINTR)
1947 break;
1948 }
1949
1950 if (error) {
1951 hammer2_inode_unlock(pmp->iroot);
1952 *vpp = NULL;
1953 } else {
1954 vp = hammer2_igetv(pmp->iroot, &error);
1955 hammer2_inode_unlock(pmp->iroot);
1956 *vpp = vp;
1957 }
1958
1959 return (error);
1960 }
1961
1962 /*
1963 * Filesystem status
1964 *
1965 * XXX incorporate ipdata->meta.inode_quota and data_quota
1966 */
1967 static
1968 int
1969 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1970 {
1971 hammer2_pfs_t *pmp;
1972 hammer2_dev_t *hmp;
1973 hammer2_blockref_t bref;
1974 struct statfs tmp;
1975 int i;
1976
1977 /*
1978 * NOTE: iroot might not have validated the cluster yet.
1979 */
1980 pmp = MPTOPMP(mp);
1981
1982 bzero(&tmp, sizeof(tmp));
1983
1984 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
1985 hmp = pmp->pfs_hmps[i];
1986 if (hmp == NULL)
1987 continue;
1988 if (pmp->iroot->cluster.array[i].chain)
1989 bref = pmp->iroot->cluster.array[i].chain->bref;
1990 else
1991 bzero(&bref, sizeof(bref));
1992
1993 tmp.f_files = bref.embed.stats.inode_count;
1994 tmp.f_ffree = 0;
1995 tmp.f_blocks = hmp->voldata.allocator_size /
1996 mp->mnt_vstat.f_bsize;
1997 tmp.f_bfree = hmp->voldata.allocator_free /
1998 mp->mnt_vstat.f_bsize;
1999 tmp.f_bavail = tmp.f_bfree;
2000
2001 if (cred && cred->cr_uid != 0) {
2002 uint64_t adj;
2003
2004 /* 5% */
2005 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2006 tmp.f_blocks -= adj;
2007 tmp.f_bfree -= adj;
2008 tmp.f_bavail -= adj;
2009 }
2010
2011 mp->mnt_stat.f_blocks = tmp.f_blocks;
2012 mp->mnt_stat.f_bfree = tmp.f_bfree;
2013 mp->mnt_stat.f_bavail = tmp.f_bavail;
2014 mp->mnt_stat.f_files = tmp.f_files;
2015 mp->mnt_stat.f_ffree = tmp.f_ffree;
2016
2017 *sbp = mp->mnt_stat;
2018 }
2019 return (0);
2020 }
2021
2022 static
2023 int
2024 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2025 {
2026 hammer2_pfs_t *pmp;
2027 hammer2_dev_t *hmp;
2028 hammer2_blockref_t bref;
2029 struct statvfs tmp;
2030 int i;
2031
2032 /*
2033 * NOTE: iroot might not have validated the cluster yet.
2034 */
2035 pmp = MPTOPMP(mp);
2036 bzero(&tmp, sizeof(tmp));
2037
2038 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2039 hmp = pmp->pfs_hmps[i];
2040 if (hmp == NULL)
2041 continue;
2042 if (pmp->iroot->cluster.array[i].chain)
2043 bref = pmp->iroot->cluster.array[i].chain->bref;
2044 else
2045 bzero(&bref, sizeof(bref));
2046
2047 tmp.f_files = bref.embed.stats.inode_count;
2048 tmp.f_ffree = 0;
2049 tmp.f_blocks = hmp->voldata.allocator_size /
2050 mp->mnt_vstat.f_bsize;
2051 tmp.f_bfree = hmp->voldata.allocator_free /
2052 mp->mnt_vstat.f_bsize;
2053 tmp.f_bavail = tmp.f_bfree;
2054
2055 if (cred && cred->cr_uid != 0) {
2056 uint64_t adj;
2057
2058 /* 5% */
2059 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2060 tmp.f_blocks -= adj;
2061 tmp.f_bfree -= adj;
2062 tmp.f_bavail -= adj;
2063 }
2064
2065 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2066 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2067 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2068 mp->mnt_vstat.f_files = tmp.f_files;
2069 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2070
2071 *sbp = mp->mnt_vstat;
2072 }
2073 return (0);
2074 }
2075
2076 /*
2077 * Mount-time recovery (RW mounts)
2078 *
2079 * Updates to the free block table are allowed to lag flushes by one
2080 * transaction. In case of a crash, then on a fresh mount we must do an
2081 * incremental scan of the last committed transaction id and make sure that
2082 * all related blocks have been marked allocated.
2083 *
2084 * The super-root topology and each PFS has its own transaction id domain,
2085 * so we must track PFS boundary transitions.
2086 */
2087 struct hammer2_recovery_elm {
2088 TAILQ_ENTRY(hammer2_recovery_elm) entry;
2089 hammer2_chain_t *chain;
2090 hammer2_tid_t sync_tid;
2091 };
2092
2093 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2094
2095 struct hammer2_recovery_info {
2096 struct hammer2_recovery_list list;
2097 hammer2_tid_t mtid;
2098 int depth;
2099 };
2100
2101 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2102 hammer2_chain_t *parent,
2103 struct hammer2_recovery_info *info,
2104 hammer2_tid_t sync_tid);
2105
2106 #define HAMMER2_RECOVERY_MAXDEPTH 10
2107
2108 static
2109 int
2110 hammer2_recovery(hammer2_dev_t *hmp)
2111 {
2112 struct hammer2_recovery_info info;
2113 struct hammer2_recovery_elm *elm;
2114 hammer2_chain_t *parent;
2115 hammer2_tid_t sync_tid;
2116 hammer2_tid_t mirror_tid;
2117 int error;
2118
2119 hammer2_trans_init(hmp->spmp, 0);
2120
2121 sync_tid = hmp->voldata.freemap_tid;
2122 mirror_tid = hmp->voldata.mirror_tid;
2123
2124 kprintf("hammer2 mount \"%s\": ", hmp->devrepname);
2125 if (sync_tid >= mirror_tid) {
2126 kprintf(" no recovery needed\n");
2127 } else {
2128 kprintf(" freemap recovery %016jx-%016jx\n",
2129 sync_tid + 1, mirror_tid);
2130 }
2131
2132 TAILQ_INIT(&info.list);
2133 info.depth = 0;
2134 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2135 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2136 hammer2_chain_lookup_done(parent);
2137
2138 while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2139 TAILQ_REMOVE(&info.list, elm, entry);
2140 parent = elm->chain;
2141 sync_tid = elm->sync_tid;
2142 kfree(elm, M_HAMMER2);
2143
2144 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2145 error |= hammer2_recovery_scan(hmp, parent, &info,
2146 hmp->voldata.freemap_tid);
2147 hammer2_chain_unlock(parent);
2148 hammer2_chain_drop(parent); /* drop elm->chain ref */
2149 }
2150
2151 hammer2_trans_done(hmp->spmp);
2152
2153 return error;
2154 }
2155
2156 static
2157 int
2158 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2159 struct hammer2_recovery_info *info,
2160 hammer2_tid_t sync_tid)
2161 {
2162 const hammer2_inode_data_t *ripdata;
2163 hammer2_chain_t *chain;
2164 hammer2_blockref_t bref;
2165 int tmp_error;
2166 int rup_error;
2167 int error;
2168 int first;
2169
2170 /*
2171 * Adjust freemap to ensure that the block(s) are marked allocated.
2172 */
2173 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2174 hammer2_freemap_adjust(hmp, &parent->bref,
2175 HAMMER2_FREEMAP_DORECOVER);
2176 }
2177
2178 /*
2179 * Check type for recursive scan
2180 */
2181 switch(parent->bref.type) {
2182 case HAMMER2_BREF_TYPE_VOLUME:
2183 /* data already instantiated */
2184 break;
2185 case HAMMER2_BREF_TYPE_INODE:
2186 /*
2187 * Must instantiate data for DIRECTDATA test and also
2188 * for recursion.
2189 */
2190 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2191 ripdata = &hammer2_chain_rdata(parent)->ipdata;
2192 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2193 /* not applicable to recovery scan */
2194 hammer2_chain_unlock(parent);
2195 return 0;
2196 }
2197 hammer2_chain_unlock(parent);
2198 break;
2199 case HAMMER2_BREF_TYPE_INDIRECT:
2200 /*
2201 * Must instantiate data for recursion
2202 */
2203 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2204 hammer2_chain_unlock(parent);
2205 break;
2206 case HAMMER2_BREF_TYPE_DIRENT:
2207 case HAMMER2_BREF_TYPE_DATA:
2208 case HAMMER2_BREF_TYPE_FREEMAP:
2209 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2210 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2211 /* not applicable to recovery scan */
2212 return 0;
2213 break;
2214 default:
2215 return HAMMER2_ERROR_BADBREF;
2216 }
2217
2218 /*
2219 * Defer operation if depth limit reached or if we are crossing a
2220 * PFS boundary.
2221 */
2222 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2223 struct hammer2_recovery_elm *elm;
2224
2225 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2226 elm->chain = parent;
2227 elm->sync_tid = sync_tid;
2228 hammer2_chain_ref(parent);
2229 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2230 /* unlocked by caller */
2231
2232 return(0);
2233 }
2234
2235
2236 /*
2237 * Recursive scan of the last flushed transaction only. We are
2238 * doing this without pmp assignments so don't leave the chains
2239 * hanging around after we are done with them.
2240 *
2241 * error Cumulative error this level only
2242 * rup_error Cumulative error for recursion
2243 * tmp_error Specific non-cumulative recursion error
2244 */
2245 chain = NULL;
2246 first = 1;
2247 rup_error = 0;
2248 error = 0;
2249
2250 for (;;) {
2251 error |= hammer2_chain_scan(parent, &chain, &bref,
2252 &first,
2253 HAMMER2_LOOKUP_NODATA);
2254
2255 /*
2256 * Problem during scan or EOF
2257 */
2258 if (error)
2259 break;
2260
2261 /*
2262 * If this is a leaf
2263 */
2264 if (chain == NULL) {
2265 if (bref.mirror_tid > sync_tid) {
2266 hammer2_freemap_adjust(hmp, &bref,
2267 HAMMER2_FREEMAP_DORECOVER);
2268 }
2269 continue;
2270 }
2271
2272 /*
2273 * This may or may not be a recursive node.
2274 */
2275 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2276 if (bref.mirror_tid > sync_tid) {
2277 ++info->depth;
2278 tmp_error = hammer2_recovery_scan(hmp, chain,
2279 info, sync_tid);
2280 --info->depth;
2281 } else {
2282 tmp_error = 0;
2283 }
2284
2285 /*
2286 * Flush the recovery at the PFS boundary to stage it for
2287 * the final flush of the super-root topology.
2288 */
2289 if (tmp_error == 0 &&
2290 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2291 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2292 hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2293 HAMMER2_FLUSH_ALL);
2294 }
2295 rup_error |= tmp_error;
2296 }
2297 return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2298 }
2299
2300 /*
2301 * This fixes up an error introduced in earlier H2 implementations where
2302 * moving a PFS inode into an indirect block wound up causing the
2303 * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2304 */
2305 static
2306 int
2307 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2308 {
2309 const hammer2_inode_data_t *ripdata;
2310 hammer2_chain_t *parent;
2311 hammer2_chain_t *chain;
2312 hammer2_key_t key_next;
2313 hammer2_pfs_t *spmp;
2314 int error;
2315
2316 error = 0;
2317
2318 /*
2319 * Lookup mount point under the media-localized super-root.
2320 *
2321 * cluster->pmp will incorrectly point to spmp and must be fixed
2322 * up later on.
2323 */
2324 spmp = hmp->spmp;
2325 hammer2_inode_lock(spmp->iroot, 0);
2326 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2327 chain = hammer2_chain_lookup(&parent, &key_next,
2328 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2329 &error, 0);
2330 while (chain) {
2331 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2332 continue;
2333 if (chain->error) {
2334 kprintf("I/O error scanning PFS labels\n");
2335 error |= chain->error;
2336 } else if ((chain->bref.flags &
2337 HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2338 int error2;
2339
2340 ripdata = &chain->data->ipdata;
2341 hammer2_trans_init(hmp->spmp, 0);
2342 error2 = hammer2_chain_modify(chain,
2343 chain->bref.modify_tid,
2344 0, 0);
2345 if (error2 == 0) {
2346 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2347 ripdata->filename);
2348 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2349 } else {
2350 error |= error2;
2351 }
2352 hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2353 HAMMER2_FLUSH_ALL);
2354 hammer2_trans_done(hmp->spmp);
2355 }
2356 chain = hammer2_chain_next(&parent, chain, &key_next,
2357 key_next, HAMMER2_KEY_MAX,
2358 &error, 0);
2359 }
2360 if (parent) {
2361 hammer2_chain_unlock(parent);
2362 hammer2_chain_drop(parent);
2363 }
2364 hammer2_inode_unlock(spmp->iroot);
2365
2366 return error;
2367 }
2368
2369 /*
2370 * Sync a mount point; this is called periodically on a per-mount basis from
2371 * the filesystem syncer, and whenever a user issues a sync.
2372 */
2373 int
2374 hammer2_vfs_sync(struct mount *mp, int waitfor)
2375 {
2376 hammer2_xop_flush_t *xop;
2377 struct hammer2_sync_info info;
2378 hammer2_inode_t *iroot;
2379 hammer2_pfs_t *pmp;
2380 int flags;
2381 int error;
2382
2383 pmp = MPTOPMP(mp);
2384 iroot = pmp->iroot;
2385 KKASSERT(iroot);
2386 KKASSERT(iroot->pmp == pmp);
2387
2388 /*
2389 * We can't acquire locks on existing vnodes while in a transaction
2390 * without risking a deadlock. This assumes that vfsync() can be
2391 * called without the vnode locked (which it can in DragonFly).
2392 * Otherwise we'd have to implement a multi-pass or flag the lock
2393 * failures and retry.
2394 *
2395 * The reclamation code interlocks with the sync list's token
2396 * (by removing the vnode from the scan list) before unlocking
2397 * the inode, giving us time to ref the inode.
2398 */
2399 /*flags = VMSC_GETVP;*/
2400 flags = 0;
2401 if (waitfor & MNT_LAZY)
2402 flags |= VMSC_ONEPASS;
2403
2404 /*
2405 * Flush vnodes individually using a normal transaction to avoid
2406 * stalling any concurrent operations. This will flush the related
2407 * buffer cache buffers and inodes to the media.
2408 *
2409 * For efficiency do an async pass before making sure with a
2410 * synchronous pass on all related buffer cache buffers.
2411 */
2412 hammer2_trans_init(pmp, 0);
2413
2414 info.error = 0;
2415
2416 info.waitfor = MNT_NOWAIT;
2417 info.pass = 1;
2418 vsyncscan(mp, flags | VMSC_NOWAIT, hammer2_sync_scan2, &info);
2419
2420 /*
2421 * Now do two passes making sure we get everything. The first pass
2422 * vfsync()s dirty vnodes. The second pass waits for their I/O's
2423 * to finish and cleans up the dirty flag on the vnode.
2424 */
2425 info.pass = 1;
2426 info.waitfor = MNT_WAIT;
2427 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2428
2429 info.pass = 2;
2430 info.waitfor = MNT_WAIT;
2431 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2432
2433 /*
2434 * We must also run the sideq to handle any disconnected inodes
2435 * as the vnode scan will not see these.
2436 */
2437 hammer2_inode_run_sideq(pmp, 1);
2438 hammer2_trans_done(pmp);
2439
2440 /*
2441 * Start our flush transaction and flush the root topology down to
2442 * the inodes, but not the inodes themselves (which we already flushed
2443 * above). Any concurrent activity effecting inode contents will not
2444 *
2445 * The flush sequence will
2446 *
2447 * NOTE! It is still possible for the paging code to push pages
2448 * out via a UIO_NOCOPY hammer2_vop_write() during the main
2449 * flush.
2450 */
2451 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2452
2453 /*
2454 * sync dirty vnodes again while in the flush transaction. This is
2455 * currently an expensive shim to makre sure the logical topology is
2456 * completely consistent before we flush the volume header.
2457 */
2458 info.pass = 1;
2459 info.waitfor = MNT_WAIT;
2460 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2461
2462 info.pass = 2;
2463 info.waitfor = MNT_WAIT;
2464 vsyncscan(mp, flags, hammer2_sync_scan2, &info);
2465
2466 /*
2467 * Use the XOP interface to concurrently flush all nodes to
2468 * synchronize the PFSROOT subtopology to the media. A standard
2469 * end-of-scan ENOENT error indicates cluster sufficiency.
2470 *
2471 * Note that this flush will not be visible on crash recovery until
2472 * we flush the super-root topology in the next loop.
2473 *
2474 * XXX For now wait for all flushes to complete.
2475 */
2476 if (iroot) {
2477 /*
2478 * If unmounting try to flush everything including any
2479 * sub-trees under inodes, just in case there is dangling
2480 * modified data, as a safety. Otherwise just flush up to
2481 * the inodes in this stage.
2482 */
2483 if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
2484 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2485 HAMMER2_XOP_VOLHDR);
2486 } else {
2487 xop = hammer2_xop_alloc(iroot, HAMMER2_XOP_MODIFYING |
2488 HAMMER2_XOP_INODE_STOP |
2489 HAMMER2_XOP_VOLHDR);
2490 }
2491 hammer2_xop_start(&xop->head, hammer2_inode_xop_flush);
2492 error = hammer2_xop_collect(&xop->head,
2493 HAMMER2_XOP_COLLECT_WAITALL);
2494 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
2495 if (error == HAMMER2_ERROR_ENOENT)
2496 error = 0;
2497 else
2498 error = hammer2_error_to_errno(error);
2499 } else {
2500 error = 0;
2501 }
2502 hammer2_trans_done(pmp);
2503
2504 return (error);
2505 }
2506
2507 /*
2508 * Sync passes.
2509 *
2510 * Note that we ignore the tranasction mtid we got above. Instead,
2511 * each vfsync below will ultimately get its own via TRANS_BUFCACHE
2512 * transactions.
2513 *
2514 * WARNING! The frontend might be waiting on chnmem (limit_dirty_chains)
2515 * while holding a vnode locked. When this situation occurs we cannot
2516 * safely test whether it is ok to clear the dirty bit on the vnode.
2517 * However, we can still flush the inode's topology.
2518 */
2519 static int
2520 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
2521 {
2522 struct hammer2_sync_info *info = data;
2523 hammer2_inode_t *ip;
2524 int error;
2525
2526 /*
2527 * Degenerate cases. Note that ip == NULL typically means the
2528 * syncer vnode itself and we don't want to vclrisdirty() in that
2529 * situation.
2530 */
2531 ip = VTOI(vp);
2532 if (ip == NULL) {
2533 return(0);
2534 }
2535 if (vp->v_type == VNON || vp->v_type == VBAD) {
2536 vclrisdirty(vp);
2537 return(0);
2538 }
2539
2540 /*
2541 * Synchronize the buffer cche and inode meta-data to the backing
2542 * chain topology.
2543 *
2544 * vfsync is not necessarily synchronous, so it is best NOT to try
2545 * to flush the backing topology to media at this point.
2546 */
2547 hammer2_inode_ref(ip);
2548 if ((ip->flags & (HAMMER2_INODE_RESIZED|HAMMER2_INODE_MODIFIED)) ||
2549 !RB_EMPTY(&vp->v_rbdirty_tree)) {
2550 if (info->pass == 1)
2551 vfsync(vp, info->waitfor, 1, NULL, NULL);
2552 else
2553 bio_track_wait(&vp->v_track_write, 0, 0);
2554 }
2555 if (info->pass == 2 && (vp->v_flag & VISDIRTY)) {
2556 /*
2557 * v_token is needed to interlock v_rbdirty_tree.
2558 */
2559 lwkt_gettoken(&vp->v_token);
2560 hammer2_inode_lock(ip, 0);
2561 hammer2_inode_chain_sync(ip);
2562 hammer2_inode_chain_flush(ip);
2563 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2564 HAMMER2_INODE_RESIZED |
2565 HAMMER2_INODE_DIRTYDATA)) == 0 &&
2566 RB_EMPTY(&vp->v_rbdirty_tree) &&
2567 !bio_track_active(&vp->v_track_write)) {
2568 vclrisdirty(vp);
2569 }
2570 hammer2_inode_unlock(ip);
2571 lwkt_reltoken(&vp->v_token);
2572 }
2573 hammer2_inode_drop(ip);
2574 #if 1
2575 error = 0;
2576 if (error)
2577 info->error = error;
2578 #endif
2579 return(0);
2580 }
2581
2582 static
2583 int
2584 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
2585 {
2586 hammer2_inode_t *ip;
2587
2588 KKASSERT(MAXFIDSZ >= 16);
2589 ip = VTOI(vp);
2590 fhp->fid_len = offsetof(struct fid, fid_data[16]);
2591 fhp->fid_ext = 0;
2592 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2593 ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2594
2595 return 0;
2596 }
2597
2598 static
2599 int
2600 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
2601 struct fid *fhp, struct vnode **vpp)
2602 {
2603 hammer2_pfs_t *pmp;
2604 hammer2_tid_t inum;
2605 int error;
2606
2607 pmp = MPTOPMP(mp);
2608 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2609 if (vpp) {
2610 if (inum == 1)
2611 error = hammer2_vfs_root(mp, vpp);
2612 else
2613 error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2614 } else {
2615 error = 0;
2616 }
2617 if (error)
2618 kprintf("fhtovp: %016jx -> %p, %d\n", inum, *vpp, error);
2619 return error;
2620 }
2621
2622 static
2623 int
2624 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2625 int *exflagsp, struct ucred **credanonp)
2626 {
2627 hammer2_pfs_t *pmp;
2628 struct netcred *np;
2629 int error;
2630
2631 pmp = MPTOPMP(mp);
2632 np = vfs_export_lookup(mp, &pmp->export, nam);
2633 if (np) {
2634 *exflagsp = np->netc_exflags;
2635 *credanonp = &np->netc_anon;
2636 error = 0;
2637 } else {
2638 error = EACCES;
2639 }
2640 return error;
2641 }
2642
2643 /*
2644 * Support code for hammer2_vfs_mount(). Read, verify, and install the volume
2645 * header into the HMP
2646 *
2647 * XXX read four volhdrs and use the one with the highest TID whos CRC
2648 * matches.
2649 *
2650 * XXX check iCRCs.
2651 *
2652 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
2653 * nonexistant locations.
2654 *
2655 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
2656 */
2657 static
2658 int
2659 hammer2_install_volume_header(hammer2_dev_t *hmp)
2660 {
2661 hammer2_volume_data_t *vd;
2662 struct buf *bp;
2663 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
2664 int error_reported;
2665 int error;
2666 int valid;
2667 int i;
2668
2669 error_reported = 0;
2670 error = 0;
2671 valid = 0;
2672 bp = NULL;
2673
2674 /*
2675 * There are up to 4 copies of the volume header (syncs iterate
2676 * between them so there is no single master). We don't trust the
2677 * volu_size field so we don't know precisely how large the filesystem
2678 * is, so depend on the OS to return an error if we go beyond the
2679 * block device's EOF.
2680 */
2681 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
2682 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
2683 HAMMER2_VOLUME_BYTES, &bp);
2684 if (error) {
2685 brelse(bp);
2686 bp = NULL;
2687 continue;
2688 }
2689
2690 vd = (struct hammer2_volume_data *) bp->b_data;
2691 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
2692 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
2693 brelse(bp);
2694 bp = NULL;
2695 continue;
2696 }
2697
2698 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
2699 /* XXX: Reversed-endianness filesystem */
2700 kprintf("hammer2: reverse-endian filesystem detected");
2701 brelse(bp);
2702 bp = NULL;
2703 continue;
2704 }
2705
2706 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
2707 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
2708 HAMMER2_VOLUME_ICRC0_SIZE);
2709 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
2710 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
2711 HAMMER2_VOLUME_ICRC1_SIZE);
2712 if ((crc0 != crc) || (bcrc0 != bcrc)) {
2713 kprintf("hammer2 volume header crc "
2714 "mismatch copy #%d %08x/%08x\n",
2715 i, crc0, crc);
2716 error_reported = 1;
2717 brelse(bp);
2718 bp = NULL;
2719 continue;
2720 }
2721 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
2722 valid = 1;
2723 hmp->voldata = *vd;
2724 hmp->volhdrno = i;
2725 }
2726 brelse(bp);
2727 bp = NULL;
2728 }
2729 if (valid) {
2730 hmp->volsync = hmp->voldata;
2731 hmp->free_reserved = hmp->voldata.allocator_size / 20;
2732 error = 0;
2733 if (error_reported || bootverbose || 1) { /* 1/DEBUG */
2734 kprintf("hammer2: using volume header #%d\n",
2735 hmp->volhdrno);
2736 }
2737 } else {
2738 error = EINVAL;
2739 kprintf("hammer2: no valid volume headers found!\n");
2740 }
2741 return (error);
2742 }
2743
2744 /*
2745 * This handles hysteresis on regular file flushes. Because the BIOs are
2746 * routed to a thread it is possible for an excessive number to build up
2747 * and cause long front-end stalls long before the runningbuffspace limit
2748 * is hit, so we implement hammer2_flush_pipe to control the
2749 * hysteresis.
2750 *
2751 * This is a particular problem when compression is used.
2752 */
2753 void
2754 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2755 {
2756 atomic_add_int(&pmp->count_lwinprog, 1);
2757 }
2758
2759 void
2760 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2761 {
2762 int lwinprog;
2763
2764 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2765 if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2766 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2767 atomic_clear_int(&pmp->count_lwinprog,
2768 HAMMER2_LWINPROG_WAITING);
2769 wakeup(&pmp->count_lwinprog);
2770 }
2771 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2772 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2773 atomic_clear_int(&pmp->count_lwinprog,
2774 HAMMER2_LWINPROG_WAITING0);
2775 wakeup(&pmp->count_lwinprog);
2776 }
2777 }
2778
2779 void
2780 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2781 {
2782 int lwinprog;
2783 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2784 HAMMER2_LWINPROG_WAITING0;
2785
2786 for (;;) {
2787 lwinprog = pmp->count_lwinprog;
2788 cpu_ccfence();
2789 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2790 break;
2791 tsleep_interlock(&pmp->count_lwinprog, 0);
2792 atomic_set_int(&pmp->count_lwinprog, lwflag);
2793 lwinprog = pmp->count_lwinprog;
2794 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2795 break;
2796 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2797 }
2798 }
2799
2800 /*
2801 * Manage excessive memory resource use for chain and related
2802 * structures.
2803 */
2804 void
2805 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2806 {
2807 uint32_t waiting;
2808 uint32_t count;
2809 uint32_t limit;
2810 #if 0
2811 static int zzticks;
2812 #endif
2813
2814 /*
2815 * Atomic check condition and wait. Also do an early speedup of
2816 * the syncer to try to avoid hitting the wait.
2817 */
2818 for (;;) {
2819 waiting = pmp->inmem_dirty_chains;
2820 cpu_ccfence();
2821 count = waiting & HAMMER2_DIRTYCHAIN_MASK;
2822
2823 limit = pmp->mp->mnt_nvnodelistsize / 10;
2824 if (limit < hammer2_limit_dirty_chains)
2825 limit = hammer2_limit_dirty_chains;
2826 if (limit < 1000)
2827 limit = 1000;
2828
2829 #if 0
2830 if ((int)(ticks - zzticks) > hz) {
2831 zzticks = ticks;
2832 kprintf("count %ld %ld\n", count, limit);
2833 }
2834 #endif
2835
2836 /*
2837 * Block if there are too many dirty chains present, wait
2838 * for the flush to clean some out.
2839 */
2840 if (count > limit) {
2841 tsleep_interlock(&pmp->inmem_dirty_chains, 0);
2842 if (atomic_cmpset_int(&pmp->inmem_dirty_chains,
2843 waiting,
2844 waiting | HAMMER2_DIRTYCHAIN_WAITING)) {
2845 speedup_syncer(pmp->mp);
2846 tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED,
2847 "chnmem", hz);
2848 }
2849 continue; /* loop on success or fail */
2850 }
2851
2852 /*
2853 * Try to start an early flush before we are forced to block.
2854 */
2855 if (count > limit * 5 / 10)
2856 speedup_syncer(pmp->mp);
2857 break;
2858 }
2859 }
2860
2861 void
2862 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2863 {
2864 if (pmp) {
2865 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2866 }
2867 }
2868
2869 void
2870 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp)
2871 {
2872 uint32_t waiting;
2873
2874 if (pmp) {
2875 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, -1);
2876 /* don't need --waiting to test flag */
2877 if (waiting & HAMMER2_DIRTYCHAIN_WAITING) {
2878 atomic_clear_int(&pmp->inmem_dirty_chains,
2879 HAMMER2_DIRTYCHAIN_WAITING);
2880 wakeup(&pmp->inmem_dirty_chains);
2881 }
2882 }
2883 }
2884
2885 /*
2886 * Returns 0 if the filesystem has tons of free space
2887 * Returns 1 if the filesystem has less than 10% remaining
2888 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
2889 */
2890 int
2891 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
2892 {
2893 hammer2_pfs_t *pmp;
2894 hammer2_dev_t *hmp;
2895 hammer2_off_t free_reserved;
2896 hammer2_off_t free_nominal;
2897 int i;
2898
2899 pmp = ip->pmp;
2900
2901 if (pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
2902 free_reserved = HAMMER2_SEGSIZE;
2903 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
2904 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2905 hmp = pmp->pfs_hmps[i];
2906 if (hmp == NULL)
2907 continue;
2908 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
2909 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
2910 continue;
2911
2912 if (free_nominal > hmp->voldata.allocator_free)
2913 free_nominal = hmp->voldata.allocator_free;
2914 if (free_reserved < hmp->free_reserved)
2915 free_reserved = hmp->free_reserved;
2916 }
2917
2918 /*
2919 * SMP races ok
2920 */
2921 pmp->free_reserved = free_reserved;
2922 pmp->free_nominal = free_nominal;
2923 pmp->free_ticks = ticks;
2924 } else {
2925 free_reserved = pmp->free_reserved;
2926 free_nominal = pmp->free_nominal;
2927 }
2928 if (cred && cred->cr_uid != 0) {
2929 if ((int64_t)(free_nominal - bytes) <
2930 (int64_t)free_reserved) {
2931 return 2;
2932 }
2933 } else {
2934 if ((int64_t)(free_nominal - bytes) <
2935 (int64_t)free_reserved / 2) {
2936 return 2;
2937 }
2938 }
2939 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
2940 return 1;
2941 return 0;
2942 }
2943
2944 /*
2945 * Debugging
2946 */
2947 void
2948 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp, char pfx,
2949 u_int flags)
2950 {
2951 hammer2_chain_t *scan;
2952 hammer2_chain_t *parent;
2953
2954 --*countp;
2955 if (*countp == 0) {
2956 kprintf("%*.*s...\n", tab, tab, "");
2957 return;
2958 }
2959 if (*countp < 0)
2960 return;
2961 kprintf("%*.*s%c-chain %p.%d %016jx/%d mir=%016jx\n",
2962 tab, tab, "", pfx,
2963 chain, chain->bref.type,
2964 chain->bref.key, chain->bref.keybits,
2965 chain->bref.mirror_tid);
2966
2967 kprintf("%*.*s [%08x] (%s) refs=%d",
2968 tab, tab, "",
2969 chain->flags,
2970 ((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
2971 chain->data) ? (char *)chain->data->ipdata.filename : "?"),
2972 chain->refs);
2973
2974 parent = chain->parent;
2975 if (parent)
2976 kprintf("\n%*.*s p=%p [pflags %08x prefs %d",
2977 tab, tab, "",
2978 parent, parent->flags, parent->refs);
2979 if (RB_EMPTY(&chain->core.rbtree)) {
2980 kprintf("\n");
2981 } else {
2982 kprintf(" {\n");
2983 RB_FOREACH(scan, hammer2_chain_tree, &chain->core.rbtree) {
2984 if ((scan->flags & flags) || flags == (u_int)-1) {
2985 hammer2_dump_chain(scan, tab + 4, countp, 'a',
2986 flags);
2987 }
2988 }
2989 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
2990 kprintf("%*.*s}(%s)\n", tab, tab, "",
2991 chain->data->ipdata.filename);
2992 else
2993 kprintf("%*.*s}\n", tab, tab, "");
2994 }
2995 }
DragonFly BSD