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usr.sbin/makefs: Sync with sys/vfs/hammer2
[dragonfly.git] / usr.sbin / makefs / hammer2 / hammer2_vfsops.c
blob67051f8d261d7c354c032506f1162322020c0122
1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2022 Tomohiro Kusumi <tkusumi@netbsd.org>
5 * Copyright (c) 2011-2022 The DragonFly Project. All rights reserved.
6 *
7 * This code is derived from software contributed to The DragonFly Project
8 * by Matthew Dillon <dillon@dragonflybsd.org>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 * 3. Neither the name of The DragonFly Project nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific, prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37 /*
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/nlookup.h>
42 #include <sys/vnode.h>
43 #include <sys/mount.h>
44 #include <sys/fcntl.h>
45 #include <sys/vfsops.h>
46 #include <sys/sysctl.h>
47 #include <sys/socket.h>
48 #include <sys/objcache.h>
49 #include <sys/proc.h>
50 #include <sys/lock.h>
51 #include <sys/file.h>
52 */
53
54 #include "hammer2.h"
55
56 TAILQ_HEAD(hammer2_mntlist, hammer2_dev);
57 static struct hammer2_mntlist hammer2_mntlist;
58
59 struct hammer2_pfslist hammer2_pfslist;
60 struct hammer2_pfslist hammer2_spmplist;
61 struct lock hammer2_mntlk;
62
63 int hammer2_supported_version = HAMMER2_VOL_VERSION_DEFAULT;
64 int hammer2_debug;
65 int hammer2_aux_flags;
66 int hammer2_xop_nthreads;
67 int hammer2_xop_sgroups;
68 int hammer2_xop_xgroups;
69 int hammer2_xop_xbase;
70 int hammer2_xop_mod;
71 long hammer2_debug_inode;
72 int hammer2_cluster_meta_read = 1; /* physical read-ahead */
73 int hammer2_cluster_data_read = 4; /* physical read-ahead */
74 int hammer2_cluster_write = 0; /* physical write clustering */
75 int hammer2_dedup_enable = 1;
76 int hammer2_always_compress = 0; /* always try to compress */
77 int hammer2_flush_pipe = 100;
78 int hammer2_dio_count;
79 int hammer2_dio_limit = 256;
80 int hammer2_bulkfree_tps = 5000;
81 int hammer2_spread_workers;
82 int hammer2_limit_saved_depth;
83 long hammer2_chain_allocs;
84 long hammer2_limit_saved_chains;
85 long hammer2_limit_dirty_chains;
86 long hammer2_limit_dirty_inodes;
87 long hammer2_count_modified_chains;
88 long hammer2_iod_file_read;
89 long hammer2_iod_meta_read;
90 long hammer2_iod_indr_read;
91 long hammer2_iod_fmap_read;
92 long hammer2_iod_volu_read;
93 long hammer2_iod_file_write;
94 long hammer2_iod_file_wembed;
95 long hammer2_iod_file_wzero;
96 long hammer2_iod_file_wdedup;
97 long hammer2_iod_meta_write;
98 long hammer2_iod_indr_write;
99 long hammer2_iod_fmap_write;
100 long hammer2_iod_volu_write;
101 static long hammer2_iod_inode_creates;
102 static long hammer2_iod_inode_deletes;
103
104 long hammer2_process_icrc32;
105 long hammer2_process_xxhash64;
106
107 int hz;
108 int ticks;
109 int64_t vnode_count;
110
111 MALLOC_DECLARE(M_HAMMER2_CBUFFER);
112 MALLOC_DEFINE(M_HAMMER2_CBUFFER, "HAMMER2-compbuffer",
113 "Buffer used for compression.");
114
115 MALLOC_DECLARE(M_HAMMER2_DEBUFFER);
116 MALLOC_DEFINE(M_HAMMER2_DEBUFFER, "HAMMER2-decompbuffer",
117 "Buffer used for decompression.");
118
119 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
120
121 SYSCTL_INT(_vfs_hammer2, OID_AUTO, supported_version, CTLFLAG_RD,
122 &hammer2_supported_version, 0, "");
123 SYSCTL_INT(_vfs_hammer2, OID_AUTO, aux_flags, CTLFLAG_RW,
124 &hammer2_aux_flags, 0, "");
125 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
126 &hammer2_debug, 0, "");
127 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, debug_inode, CTLFLAG_RW,
128 &hammer2_debug_inode, 0, "");
129 SYSCTL_INT(_vfs_hammer2, OID_AUTO, spread_workers, CTLFLAG_RW,
130 &hammer2_spread_workers, 0, "");
131 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_meta_read, CTLFLAG_RW,
132 &hammer2_cluster_meta_read, 0, "");
133 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_data_read, CTLFLAG_RW,
134 &hammer2_cluster_data_read, 0, "");
135 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_write, CTLFLAG_RW,
136 &hammer2_cluster_write, 0, "");
137 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dedup_enable, CTLFLAG_RW,
138 &hammer2_dedup_enable, 0, "");
139 SYSCTL_INT(_vfs_hammer2, OID_AUTO, always_compress, CTLFLAG_RW,
140 &hammer2_always_compress, 0, "");
141 SYSCTL_INT(_vfs_hammer2, OID_AUTO, flush_pipe, CTLFLAG_RW,
142 &hammer2_flush_pipe, 0, "");
143 SYSCTL_INT(_vfs_hammer2, OID_AUTO, bulkfree_tps, CTLFLAG_RW,
144 &hammer2_bulkfree_tps, 0, "");
145 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, chain_allocs, CTLFLAG_RD,
146 &hammer2_chain_allocs, 0, "");
147 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_saved_chains, CTLFLAG_RW,
148 &hammer2_limit_saved_chains, 0, "");
149 SYSCTL_INT(_vfs_hammer2, OID_AUTO, limit_saved_depth, CTLFLAG_RW,
150 &hammer2_limit_saved_depth, 0, "");
151 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_chains, CTLFLAG_RW,
152 &hammer2_limit_dirty_chains, 0, "");
153 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, limit_dirty_inodes, CTLFLAG_RW,
154 &hammer2_limit_dirty_inodes, 0, "");
155 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, count_modified_chains, CTLFLAG_RD,
156 &hammer2_count_modified_chains, 0, "");
157 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_count, CTLFLAG_RD,
158 &hammer2_dio_count, 0, "");
159 SYSCTL_INT(_vfs_hammer2, OID_AUTO, dio_limit, CTLFLAG_RW,
160 &hammer2_dio_limit, 0, "");
161
162 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RD,
163 &hammer2_iod_file_read, 0, "");
164 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RD,
165 &hammer2_iod_meta_read, 0, "");
166 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RD,
167 &hammer2_iod_indr_read, 0, "");
168 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_read, CTLFLAG_RD,
169 &hammer2_iod_fmap_read, 0, "");
170 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_read, CTLFLAG_RD,
171 &hammer2_iod_volu_read, 0, "");
172
173 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RD,
174 &hammer2_iod_file_write, 0, "");
175 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wembed, CTLFLAG_RD,
176 &hammer2_iod_file_wembed, 0, "");
177 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wzero, CTLFLAG_RD,
178 &hammer2_iod_file_wzero, 0, "");
179 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_wdedup, CTLFLAG_RD,
180 &hammer2_iod_file_wdedup, 0, "");
181 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RD,
182 &hammer2_iod_meta_write, 0, "");
183 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RD,
184 &hammer2_iod_indr_write, 0, "");
185 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_fmap_write, CTLFLAG_RD,
186 &hammer2_iod_fmap_write, 0, "");
187 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RD,
188 &hammer2_iod_volu_write, 0, "");
189 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_creates, CTLFLAG_RD,
190 &hammer2_iod_inode_creates, 0, "");
191 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_inode_deletes, CTLFLAG_RD,
192 &hammer2_iod_inode_deletes, 0, "");
193
194 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_icrc32, CTLFLAG_RD,
195 &hammer2_process_icrc32, 0, "");
196 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, process_xxhash64, CTLFLAG_RD,
197 &hammer2_process_xxhash64, 0, "");
198
199 /*
200 static int hammer2_vfs_init(struct vfsconf *conf);
201 static int hammer2_vfs_uninit(struct vfsconf *vfsp);
202 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
203 struct ucred *cred);
204 static int hammer2_remount(hammer2_dev_t *, struct mount *, char *,
205 struct ucred *);
206 */
207 static int hammer2_recovery(hammer2_dev_t *hmp);
208 /*
209 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
210 static int hammer2_vfs_root(struct mount *mp, struct m_vnode **vpp);
211 */
212 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
213 struct ucred *cred);
214 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
215 struct ucred *cred);
216 /*
217 static int hammer2_vfs_fhtovp(struct mount *mp, struct m_vnode *rootvp,
218 struct fid *fhp, struct m_vnode **vpp);
219 static int hammer2_vfs_vptofh(struct m_vnode *vp, struct fid *fhp);
220 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
221 int *exflagsp, struct ucred **credanonp);
222 static int hammer2_vfs_modifying(struct mount *mp);
223 */
224
225 static void hammer2_update_pmps(hammer2_dev_t *hmp);
226
227 static void hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp);
228 static void hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp,
229 hammer2_dev_t *hmp);
230 static int hammer2_fixup_pfses(hammer2_dev_t *hmp);
231
232 /*
233 * HAMMER2 vfs operations.
234 */
235 /*
236 static struct vfsops hammer2_vfsops = {
237 .vfs_flags = 0,
238 .vfs_init = hammer2_vfs_init,
239 .vfs_uninit = hammer2_vfs_uninit,
240 .vfs_sync = hammer2_vfs_sync,
241 .vfs_mount = hammer2_vfs_mount,
242 .vfs_unmount = hammer2_vfs_unmount,
243 .vfs_root = hammer2_vfs_root,
244 .vfs_statfs = hammer2_vfs_statfs,
245 .vfs_statvfs = hammer2_vfs_statvfs,
246 .vfs_vget = hammer2_vfs_vget,
247 .vfs_vptofh = hammer2_vfs_vptofh,
248 .vfs_fhtovp = hammer2_vfs_fhtovp,
249 .vfs_checkexp = hammer2_vfs_checkexp,
250 .vfs_modifying = hammer2_vfs_modifying
251 };
252 */
253
254 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
255
256 VFS_SET(hammer2_vfsops, hammer2, VFCF_MPSAFE);
257 MODULE_VERSION(hammer2, 1);
258
259 int
260 hammer2_vfs_init(void)
261 {
262 /*
263 static struct objcache_malloc_args margs_read;
264 static struct objcache_malloc_args margs_write;
265 static struct objcache_malloc_args margs_vop;
266 */
267
268 int error;
269 int mod;
270
271 error = 0;
272 kmalloc_raise_limit(M_HAMMER2, 0); /* unlimited */
273
274 /*
275 * hammer2_xop_nthreads must be a multiple of ncpus,
276 * minimum 2 * ncpus.
277 */
278 const int ncpus = 1;
279 mod = ncpus;
280 hammer2_xop_mod = mod;
281 hammer2_xop_nthreads = mod * 2;
282 /*
283 while (hammer2_xop_nthreads / mod < HAMMER2_XOPGROUPS_MIN ||
284 hammer2_xop_nthreads < HAMMER2_XOPTHREADS_MIN)
285 {
286 hammer2_xop_nthreads += mod;
287 }
288 hammer2_xop_sgroups = hammer2_xop_nthreads / mod / 2;
289 hammer2_xop_xgroups = hammer2_xop_nthreads / mod - hammer2_xop_sgroups;
290 hammer2_xop_xbase = hammer2_xop_sgroups * mod;
291 */
292
293 /*
294 * A large DIO cache is needed to retain dedup enablement masks.
295 * The bulkfree code clears related masks as part of the disk block
296 * recycling algorithm, preventing it from being used for a later
297 * dedup.
298 *
299 * NOTE: A large buffer cache can actually interfere with dedup
300 * operation because we dedup based on media physical buffers
301 * and not logical buffers. Try to make the DIO case large
302 * enough to avoid this problem, but also cap it.
303 */
304 const long nbuf = 100000; /* XXX */
305 hammer2_dio_limit = nbuf * 2;
306 if (hammer2_dio_limit > 100000)
307 hammer2_dio_limit = 100000;
308
309 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
310 error = EINVAL;
311 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
312 error = EINVAL;
313 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
314 error = EINVAL;
315
316 if (error) {
317 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
318 return (error);
319 }
320
321 #if 0
322 margs_read.objsize = 65536;
323 margs_read.mtype = M_HAMMER2_DEBUFFER;
324
325 margs_write.objsize = 32768;
326 margs_write.mtype = M_HAMMER2_CBUFFER;
327
328 margs_vop.objsize = sizeof(hammer2_xop_t);
329 margs_vop.mtype = M_HAMMER2;
330
331 /*
332 * Note thaht for the XOPS cache we want backing store allocations
333 * to use M_ZERO. This is not allowed in objcache_get() (to avoid
334 * confusion), so use the backing store function that does it. This
335 * means that initial XOPS objects are zerod but REUSED objects are
336 * not. So we are responsible for cleaning the object up sufficiently
337 * for our needs before objcache_put()ing it back (typically just the
338 * FIFO indices).
339 */
340 cache_buffer_read = objcache_create(margs_read.mtype->ks_shortdesc,
341 0, 1, NULL, NULL, NULL,
342 objcache_malloc_alloc,
343 objcache_malloc_free,
344 &margs_read);
345 cache_buffer_write = objcache_create(margs_write.mtype->ks_shortdesc,
346 0, 1, NULL, NULL, NULL,
347 objcache_malloc_alloc,
348 objcache_malloc_free,
349 &margs_write);
350 cache_xops = objcache_create(margs_vop.mtype->ks_shortdesc,
351 0, 1, NULL, NULL, NULL,
352 objcache_malloc_alloc_zero,
353 objcache_malloc_free,
354 &margs_vop);
355 #endif
356
357
358 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
359 TAILQ_INIT(&hammer2_mntlist);
360 TAILQ_INIT(&hammer2_pfslist);
361 TAILQ_INIT(&hammer2_spmplist);
362
363 const int maxvnodes = 100000; /* XXX */
364 hammer2_limit_dirty_chains = maxvnodes / 10;
365 if (hammer2_limit_dirty_chains > HAMMER2_LIMIT_DIRTY_CHAINS)
366 hammer2_limit_dirty_chains = HAMMER2_LIMIT_DIRTY_CHAINS;
367 if (hammer2_limit_dirty_chains < 1000)
368 hammer2_limit_dirty_chains = 1000;
369
370 hammer2_limit_dirty_inodes = maxvnodes / 25;
371 if (hammer2_limit_dirty_inodes < 100)
372 hammer2_limit_dirty_inodes = 100;
373 if (hammer2_limit_dirty_inodes > HAMMER2_LIMIT_DIRTY_INODES)
374 hammer2_limit_dirty_inodes = HAMMER2_LIMIT_DIRTY_INODES;
375
376 hammer2_limit_saved_chains = hammer2_limit_dirty_chains * 5;
377
378 return (error);
379 }
380
381 int
382 hammer2_vfs_uninit(void)
383 {
384 /*
385 objcache_destroy(cache_buffer_read);
386 objcache_destroy(cache_buffer_write);
387 objcache_destroy(cache_xops);
388 */
389 return 0;
390 }
391
392 /*
393 * Core PFS allocator. Used to allocate or reference the pmp structure
394 * for PFS cluster mounts and the spmp structure for media (hmp) structures.
395 * The pmp can be passed in or loaded by this function using the chain and
396 * inode data.
397 *
398 * pmp->modify_tid tracks new modify_tid transaction ids for front-end
399 * transactions. Note that synchronization does not use this field.
400 * (typically frontend operations and synchronization cannot run on the
401 * same PFS node at the same time).
402 *
403 * XXX check locking
404 */
405 hammer2_pfs_t *
406 hammer2_pfsalloc(hammer2_chain_t *chain,
407 const hammer2_inode_data_t *ripdata,
408 hammer2_dev_t *force_local)
409 {
410 hammer2_pfs_t *pmp;
411 hammer2_inode_t *iroot;
412 int count;
413 int i;
414 int j;
415
416 pmp = NULL;
417
418 /*
419 * Locate or create the PFS based on the cluster id. If ripdata
420 * is NULL this is a spmp which is unique and is always allocated.
421 *
422 * If the device is mounted in local mode all PFSs are considered
423 * independent and not part of any cluster (for debugging only).
424 */
425 if (ripdata) {
426 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
427 if (force_local != pmp->force_local)
428 continue;
429 if (force_local == NULL &&
430 bcmp(&pmp->pfs_clid, &ripdata->meta.pfs_clid,
431 sizeof(pmp->pfs_clid)) == 0) {
432 break;
433 } else if (force_local && pmp->pfs_names[0] &&
434 strcmp(pmp->pfs_names[0], (const char *)ripdata->filename) == 0) {
435 break;
436 }
437 }
438 }
439
440 if (pmp == NULL) {
441 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
442 pmp->force_local = force_local;
443 hammer2_trans_manage_init(pmp);
444 kmalloc_create_obj(&pmp->minode, "HAMMER2-inodes",
445 sizeof(struct hammer2_inode));
446 lockinit(&pmp->lock, "pfslk", 0, 0);
447 hammer2_spin_init(&pmp->inum_spin, "hm2pfsalloc_inum");
448 hammer2_spin_init(&pmp->xop_spin, "h2xop");
449 hammer2_spin_init(&pmp->lru_spin, "h2lru");
450 RB_INIT(&pmp->inum_tree);
451 TAILQ_INIT(&pmp->syncq);
452 TAILQ_INIT(&pmp->depq);
453 TAILQ_INIT(&pmp->lru_list);
454 hammer2_spin_init(&pmp->list_spin, "h2pfsalloc_list");
455
456 /*
457 * Save the last media transaction id for the flusher. Set
458 * initial
459 */
460 if (ripdata) {
461 pmp->pfs_clid = ripdata->meta.pfs_clid;
462 TAILQ_INSERT_TAIL(&hammer2_pfslist, pmp, mntentry);
463 } else {
464 pmp->flags |= HAMMER2_PMPF_SPMP;
465 TAILQ_INSERT_TAIL(&hammer2_spmplist, pmp, mntentry);
466 }
467
468 /*
469 * The synchronization thread may start too early, make
470 * sure it stays frozen until we are ready to let it go.
471 * XXX
472 */
473 /*
474 pmp->primary_thr.flags = HAMMER2_THREAD_FROZEN |
475 HAMMER2_THREAD_REMASTER;
476 */
477 }
478
479 /*
480 * Create the PFS's root inode and any missing XOP helper threads.
481 */
482 if ((iroot = pmp->iroot) == NULL) {
483 iroot = hammer2_inode_get(pmp, NULL, 1, -1);
484 if (ripdata)
485 iroot->meta = ripdata->meta;
486 pmp->iroot = iroot;
487 hammer2_inode_ref(iroot);
488 hammer2_inode_unlock(iroot);
489 }
490
491 /*
492 * Stop here if no chain is passed in.
493 */
494 if (chain == NULL)
495 goto done;
496
497 /*
498 * When a chain is passed in we must add it to the PFS's root
499 * inode, update pmp->pfs_types[], and update the syncronization
500 * threads.
501 *
502 * When forcing local mode, mark the PFS as a MASTER regardless.
503 *
504 * At the moment empty spots can develop due to removals or failures.
505 * Ultimately we want to re-fill these spots but doing so might
506 * confused running code. XXX
507 */
508 hammer2_inode_ref(iroot);
509 hammer2_mtx_ex(&iroot->lock);
510 j = iroot->cluster.nchains;
511
512 if (j == HAMMER2_MAXCLUSTER) {
513 kprintf("hammer2_pfsalloc: cluster full!\n");
514 /* XXX fatal error? */
515 } else {
516 KKASSERT(chain->pmp == NULL);
517 chain->pmp = pmp;
518 hammer2_chain_ref(chain);
519 iroot->cluster.array[j].chain = chain;
520 if (force_local)
521 pmp->pfs_types[j] = HAMMER2_PFSTYPE_MASTER;
522 else
523 pmp->pfs_types[j] = ripdata->meta.pfs_type;
524 pmp->pfs_names[j] = kstrdup((const char *)ripdata->filename, M_HAMMER2);
525 pmp->pfs_hmps[j] = chain->hmp;
526 hammer2_spin_ex(&pmp->inum_spin);
527 pmp->pfs_iroot_blocksets[j] = chain->data->ipdata.u.blockset;
528 hammer2_spin_unex(&pmp->inum_spin);
529
530 /*
531 * If the PFS is already mounted we must account
532 * for the mount_count here.
533 */
534 if (pmp->mp)
535 ++chain->hmp->mount_count;
536
537 /*
538 * May have to fixup dirty chain tracking. Previous
539 * pmp was NULL so nothing to undo.
540 */
541 if (chain->flags & HAMMER2_CHAIN_MODIFIED)
542 hammer2_pfs_memory_inc(pmp);
543 ++j;
544 }
545 iroot->cluster.nchains = j;
546
547 /*
548 * Update nmasters from any PFS inode which is part of the cluster.
549 * It is possible that this will result in a value which is too
550 * high. MASTER PFSs are authoritative for pfs_nmasters and will
551 * override this value later on.
552 *
553 * (This informs us of masters that might not currently be
554 * discoverable by this mount).
555 */
556 if (ripdata && pmp->pfs_nmasters < ripdata->meta.pfs_nmasters) {
557 pmp->pfs_nmasters = ripdata->meta.pfs_nmasters;
558 }
559
560 /*
561 * Count visible masters. Masters are usually added with
562 * ripdata->meta.pfs_nmasters set to 1. This detects when there
563 * are more (XXX and must update the master inodes).
564 */
565 count = 0;
566 for (i = 0; i < iroot->cluster.nchains; ++i) {
567 if (pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER)
568 ++count;
569 }
570 if (pmp->pfs_nmasters < count)
571 pmp->pfs_nmasters = count;
572
573 /*
574 * Create missing synchronization and support threads.
575 *
576 * Single-node masters (including snapshots) have nothing to
577 * synchronize and do not require this thread.
578 *
579 * Multi-node masters or any number of soft masters, slaves, copy,
580 * or other PFS types need the thread.
581 *
582 * Each thread is responsible for its particular cluster index.
583 * We use independent threads so stalls or mismatches related to
584 * any given target do not affect other targets.
585 */
586 for (i = 0; i < iroot->cluster.nchains; ++i) {
587 /*
588 * Single-node masters (including snapshots) have nothing
589 * to synchronize and will make direct xops support calls,
590 * thus they do not require this thread.
591 *
592 * Note that there can be thousands of snapshots. We do not
593 * want to create thousands of threads.
594 */
595 if (pmp->pfs_nmasters <= 1 &&
596 pmp->pfs_types[i] == HAMMER2_PFSTYPE_MASTER) {
597 continue;
598 }
599
600 /*
601 * Sync support thread
602 */
603 /*
604 if (pmp->sync_thrs[i].td == NULL) {
605 hammer2_thr_create(&pmp->sync_thrs[i], pmp, NULL,
606 "h2nod", i, -1,
607 hammer2_primary_sync_thread);
608 }
609 */
610 }
611
612 /*
613 * Create missing Xop threads
614 *
615 * NOTE: We create helper threads for all mounted PFSs or any
616 * PFSs with 2+ nodes (so the sync thread can update them,
617 * even if not mounted).
618 */
619 if (pmp->mp || iroot->cluster.nchains >= 2)
620 hammer2_xop_helper_create(pmp);
621
622 hammer2_mtx_unlock(&iroot->lock);
623 hammer2_inode_drop(iroot);
624 done:
625 return pmp;
626 }
627
628 /*
629 * Deallocate an element of a probed PFS. If destroying and this is a
630 * MASTER, adjust nmasters.
631 *
632 * This function does not physically destroy the PFS element in its device
633 * under the super-root (see hammer2_ioctl_pfs_delete()).
634 */
635 void
636 hammer2_pfsdealloc(hammer2_pfs_t *pmp, int clindex, int destroying)
637 {
638 hammer2_inode_t *iroot;
639 hammer2_chain_t *chain;
640 int j;
641
642 /*
643 * Cleanup our reference on iroot. iroot is (should) not be needed
644 * by the flush code.
645 */
646 iroot = pmp->iroot;
647 if (iroot) {
648 /*
649 * Stop synchronizing
650 *
651 * XXX flush after acquiring the iroot lock.
652 * XXX clean out the cluster index from all inode structures.
653 */
654 hammer2_thr_delete(&pmp->sync_thrs[clindex]);
655
656 /*
657 * Remove the cluster index from the group. If destroying
658 * the PFS and this is a master, adjust pfs_nmasters.
659 */
660 hammer2_mtx_ex(&iroot->lock);
661 chain = iroot->cluster.array[clindex].chain;
662 iroot->cluster.array[clindex].chain = NULL;
663
664 switch(pmp->pfs_types[clindex]) {
665 case HAMMER2_PFSTYPE_MASTER:
666 if (destroying && pmp->pfs_nmasters > 0)
667 --pmp->pfs_nmasters;
668 /* XXX adjust ripdata->meta.pfs_nmasters */
669 break;
670 default:
671 break;
672 }
673 pmp->pfs_types[clindex] = HAMMER2_PFSTYPE_NONE;
674
675 hammer2_mtx_unlock(&iroot->lock);
676
677 /*
678 * Release the chain.
679 */
680 if (chain) {
681 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
682 hammer2_chain_drop(chain);
683 }
684
685 /*
686 * Terminate all XOP threads for the cluster index.
687 */
688 if (pmp->xop_groups) {
689 for (j = 0; j < hammer2_xop_nthreads; ++j) {
690 hammer2_thr_delete(
691 &pmp->xop_groups[j].thrs[clindex]);
692 }
693 }
694 }
695 }
696
697 /*
698 * Destroy a PFS, typically only occurs after the last mount on a device
699 * has gone away.
700 */
701 static void
702 hammer2_pfsfree(hammer2_pfs_t *pmp)
703 {
704 hammer2_inode_t *iroot;
705 hammer2_chain_t *chain;
706 int chains_still_present = 0;
707 int i;
708 //int j;
709
710 /*
711 * Cleanup our reference on iroot. iroot is (should) not be needed
712 * by the flush code.
713 */
714 if (pmp->flags & HAMMER2_PMPF_SPMP)
715 TAILQ_REMOVE(&hammer2_spmplist, pmp, mntentry);
716 else
717 TAILQ_REMOVE(&hammer2_pfslist, pmp, mntentry);
718
719 /*
720 * Cleanup chains remaining on LRU list.
721 */
722 hammer2_spin_ex(&pmp->lru_spin);
723 while ((chain = TAILQ_FIRST(&pmp->lru_list)) != NULL) {
724 KKASSERT(chain->flags & HAMMER2_CHAIN_ONLRU);
725 atomic_add_int(&pmp->lru_count, -1);
726 atomic_clear_int(&chain->flags, HAMMER2_CHAIN_ONLRU);
727 TAILQ_REMOVE(&pmp->lru_list, chain, lru_node);
728 hammer2_chain_ref(chain);
729 hammer2_spin_unex(&pmp->lru_spin);
730 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
731 hammer2_chain_drop(chain);
732 hammer2_spin_ex(&pmp->lru_spin);
733 }
734 hammer2_spin_unex(&pmp->lru_spin);
735
736 /*
737 * Clean up iroot
738 */
739 iroot = pmp->iroot;
740 if (iroot) {
741 for (i = 0; i < iroot->cluster.nchains; ++i) {
742 /*
743 hammer2_thr_delete(&pmp->sync_thrs[i]);
744 if (pmp->xop_groups) {
745 for (j = 0; j < hammer2_xop_nthreads; ++j)
746 hammer2_thr_delete(
747 &pmp->xop_groups[j].thrs[i]);
748 }
749 */
750 chain = iroot->cluster.array[i].chain;
751 if (chain && !RB_EMPTY(&chain->core.rbtree)) {
752 kprintf("hammer2: Warning pmp %p still "
753 "has active chains\n", pmp);
754 chains_still_present = 1;
755 }
756 }
757 KASSERT(iroot->refs == 1,
758 ("PMP->IROOT %p REFS WRONG %d", iroot, iroot->refs));
759
760 /* ref for iroot */
761 hammer2_inode_drop(iroot);
762 pmp->iroot = NULL;
763 }
764
765 /*
766 * Free remaining pmp resources
767 */
768 if (chains_still_present) {
769 kprintf("hammer2: cannot free pmp %p, still in use\n", pmp);
770 } else {
771 /*
772 * In makefs HAMMER2, all inodes must be gone at this point.
773 * XXX vnode_count may not be 0 at this point.
774 */
775 assert(hammer2_pfs_inode_count(pmp) == 0);
776
777 kmalloc_destroy_obj(&pmp->minode);
778 kfree(pmp, M_HAMMER2);
779 }
780 }
781
782 /*
783 * Remove all references to hmp from the pfs list. Any PFS which becomes
784 * empty is terminated and freed.
785 *
786 * XXX inefficient.
787 */
788 static void
789 hammer2_pfsfree_scan(hammer2_dev_t *hmp, int which)
790 {
791 hammer2_pfs_t *pmp;
792 hammer2_inode_t *iroot;
793 hammer2_chain_t *rchain;
794 int i;
795 //int j;
796 struct hammer2_pfslist *wlist;
797
798 if (which == 0)
799 wlist = &hammer2_pfslist;
800 else
801 wlist = &hammer2_spmplist;
802 again:
803 TAILQ_FOREACH(pmp, wlist, mntentry) {
804 if ((iroot = pmp->iroot) == NULL)
805 continue;
806
807 /*
808 * Determine if this PFS is affected. If it is we must
809 * freeze all management threads and lock its iroot.
810 *
811 * Freezing a management thread forces it idle, operations
812 * in-progress will be aborted and it will have to start
813 * over again when unfrozen, or exit if told to exit.
814 */
815 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
816 if (pmp->pfs_hmps[i] == hmp)
817 break;
818 }
819 if (i == HAMMER2_MAXCLUSTER)
820 continue;
821
822 hammer2_vfs_sync_pmp(pmp, MNT_WAIT);
823
824 /*
825 * Make sure all synchronization threads are locked
826 * down.
827 */
828 /*
829 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
830 if (pmp->pfs_hmps[i] == NULL)
831 continue;
832 hammer2_thr_freeze_async(&pmp->sync_thrs[i]);
833 if (pmp->xop_groups) {
834 for (j = 0; j < hammer2_xop_nthreads; ++j) {
835 hammer2_thr_freeze_async(
836 &pmp->xop_groups[j].thrs[i]);
837 }
838 }
839 }
840 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
841 if (pmp->pfs_hmps[i] == NULL)
842 continue;
843 hammer2_thr_freeze(&pmp->sync_thrs[i]);
844 if (pmp->xop_groups) {
845 for (j = 0; j < hammer2_xop_nthreads; ++j) {
846 hammer2_thr_freeze(
847 &pmp->xop_groups[j].thrs[i]);
848 }
849 }
850 }
851 */
852
853 /*
854 * Lock the inode and clean out matching chains.
855 * Note that we cannot use hammer2_inode_lock_*()
856 * here because that would attempt to validate the
857 * cluster that we are in the middle of ripping
858 * apart.
859 *
860 * WARNING! We are working directly on the inodes
861 * embedded cluster.
862 */
863 hammer2_mtx_ex(&iroot->lock);
864
865 /*
866 * Remove the chain from matching elements of the PFS.
867 */
868 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
869 if (pmp->pfs_hmps[i] != hmp)
870 continue;
871 /*
872 hammer2_thr_delete(&pmp->sync_thrs[i]);
873 if (pmp->xop_groups) {
874 for (j = 0; j < hammer2_xop_nthreads; ++j) {
875 hammer2_thr_delete(
876 &pmp->xop_groups[j].thrs[i]);
877 }
878 }
879 */
880 rchain = iroot->cluster.array[i].chain;
881 iroot->cluster.array[i].chain = NULL;
882 pmp->pfs_types[i] = HAMMER2_PFSTYPE_NONE;
883 if (pmp->pfs_names[i]) {
884 kfree(pmp->pfs_names[i], M_HAMMER2);
885 pmp->pfs_names[i] = NULL;
886 }
887 if (rchain) {
888 hammer2_chain_drop(rchain);
889 /* focus hint */
890 if (iroot->cluster.focus == rchain)
891 iroot->cluster.focus = NULL;
892 }
893 pmp->pfs_hmps[i] = NULL;
894 }
895 hammer2_mtx_unlock(&iroot->lock);
896
897 /*
898 * Cleanup trailing chains. Gaps may remain.
899 */
900 for (i = HAMMER2_MAXCLUSTER - 1; i >= 0; --i) {
901 if (pmp->pfs_hmps[i])
902 break;
903 }
904 iroot->cluster.nchains = i + 1;
905
906 /*
907 * If the PMP has no elements remaining we can destroy it.
908 * (this will transition management threads from frozen->exit).
909 */
910 if (iroot->cluster.nchains == 0) {
911 /*
912 * If this was the hmp's spmp, we need to clean
913 * a little more stuff out.
914 */
915 if (hmp->spmp == pmp) {
916 hmp->spmp = NULL;
917 hmp->vchain.pmp = NULL;
918 hmp->fchain.pmp = NULL;
919 }
920
921 /*
922 * Free the pmp and restart the loop
923 */
924 KKASSERT(TAILQ_EMPTY(&pmp->syncq));
925 KKASSERT(TAILQ_EMPTY(&pmp->depq));
926 hammer2_pfsfree(pmp);
927 goto again;
928 }
929
930 /*
931 * If elements still remain we need to set the REMASTER
932 * flag and unfreeze it.
933 */
934 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
935 if (pmp->pfs_hmps[i] == NULL)
936 continue;
937 /*
938 hammer2_thr_remaster(&pmp->sync_thrs[i]);
939 hammer2_thr_unfreeze(&pmp->sync_thrs[i]);
940 if (pmp->xop_groups) {
941 for (j = 0; j < hammer2_xop_nthreads; ++j) {
942 hammer2_thr_remaster(
943 &pmp->xop_groups[j].thrs[i]);
944 hammer2_thr_unfreeze(
945 &pmp->xop_groups[j].thrs[i]);
946 }
947 }
948 */
949 }
950 }
951 }
952
953 /*
954 * Mount or remount HAMMER2 fileystem from physical media
955 *
956 * mountroot
957 * mp mount point structure
958 * path NULL
959 * data <unused>
960 * cred <unused>
961 *
962 * mount
963 * mp mount point structure
964 * path path to mount point
965 * data pointer to argument structure in user space
966 * volume volume path (device@LABEL form)
967 * hflags user mount flags
968 * cred user credentials
969 *
970 * RETURNS: 0 Success
971 * !0 error number
972 */
973 int
974 hammer2_vfs_mount(struct m_vnode *makefs_devvp, struct mount *mp,
975 const char *label, const struct hammer2_mount_info *mi)
976 {
977 struct hammer2_mount_info info = *mi;
978 hammer2_pfs_t *pmp;
979 hammer2_pfs_t *spmp;
980 hammer2_dev_t *hmp, *hmp_tmp;
981 hammer2_dev_t *force_local;
982 hammer2_key_t key_next;
983 hammer2_key_t key_dummy;
984 hammer2_key_t lhc;
985 hammer2_chain_t *parent;
986 hammer2_chain_t *chain;
987 const hammer2_inode_data_t *ripdata;
988 hammer2_devvp_list_t devvpl;
989 hammer2_devvp_t *e, *e_tmp;
990 char *devstr;
991 int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
992 int error;
993 int i;
994
995 hmp = NULL;
996 pmp = NULL;
997 devstr = NULL;
998
999 kprintf("hammer2_mount: device=\"%s\" label=\"%s\" rdonly=%d\n",
1000 devstr, label, ronly);
1001
1002 /*
1003 * Initialize all device vnodes.
1004 */
1005 TAILQ_INIT(&devvpl);
1006 error = hammer2_init_devvp(makefs_devvp, &devvpl);
1007 if (error) {
1008 kprintf("hammer2: failed to initialize devvp in %s\n", devstr);
1009 hammer2_cleanup_devvp(&devvpl);
1010 return error;
1011 }
1012
1013 /*
1014 * Determine if the device has already been mounted. After this
1015 * check hmp will be non-NULL if we are doing the second or more
1016 * hammer2 mounts from the same device.
1017 */
1018 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1019 if (!TAILQ_EMPTY(&devvpl)) {
1020 /*
1021 * Match the device. Due to the way devfs works,
1022 * we may not be able to directly match the vnode pointer,
1023 * so also check to see if the underlying device matches.
1024 */
1025 TAILQ_FOREACH(hmp_tmp, &hammer2_mntlist, mntentry) {
1026 TAILQ_FOREACH(e_tmp, &hmp_tmp->devvpl, entry) {
1027 int devvp_found = 0;
1028 TAILQ_FOREACH(e, &devvpl, entry) {
1029 KKASSERT(e->devvp);
1030 if (e_tmp->devvp == e->devvp)
1031 devvp_found = 1;
1032 /*
1033 if (e_tmp->devvp->v_rdev &&
1034 e_tmp->devvp->v_rdev == e->devvp->v_rdev)
1035 devvp_found = 1;
1036 */
1037 }
1038 if (!devvp_found)
1039 goto next_hmp;
1040 }
1041 hmp = hmp_tmp;
1042 kprintf("hammer2_mount: hmp=%p matched\n", hmp);
1043 break;
1044 next_hmp:
1045 continue;
1046 }
1047
1048 /*
1049 * If no match this may be a fresh H2 mount, make sure
1050 * the device is not mounted on anything else.
1051 */
1052 if (hmp == NULL) {
1053 TAILQ_FOREACH(e, &devvpl, entry) {
1054 struct m_vnode *devvp = e->devvp;
1055 KKASSERT(devvp);
1056 error = vfs_mountedon(devvp);
1057 if (error) {
1058 kprintf("hammer2_mount: %s mounted %d\n",
1059 e->path, error);
1060 hammer2_cleanup_devvp(&devvpl);
1061 lockmgr(&hammer2_mntlk, LK_RELEASE);
1062 return error;
1063 }
1064 }
1065 }
1066 } else {
1067 /*
1068 * Match the label to a pmp already probed.
1069 */
1070 TAILQ_FOREACH(pmp, &hammer2_pfslist, mntentry) {
1071 for (i = 0; i < HAMMER2_MAXCLUSTER; ++i) {
1072 if (pmp->pfs_names[i] &&
1073 strcmp(pmp->pfs_names[i], label) == 0) {
1074 hmp = pmp->pfs_hmps[i];
1075 break;
1076 }
1077 }
1078 if (hmp)
1079 break;
1080 }
1081 if (hmp == NULL) {
1082 kprintf("hammer2_mount: PFS label \"%s\" not found\n",
1083 label);
1084 hammer2_cleanup_devvp(&devvpl);
1085 lockmgr(&hammer2_mntlk, LK_RELEASE);
1086 return ENOENT;
1087 }
1088 }
1089
1090 /*
1091 * Open the device if this isn't a secondary mount and construct
1092 * the H2 device mount (hmp).
1093 */
1094 if (hmp == NULL) {
1095 hammer2_chain_t *schain;
1096 hammer2_xop_head_t xop;
1097
1098 /*
1099 * Now open the device
1100 */
1101 KKASSERT(!TAILQ_EMPTY(&devvpl));
1102 error = hammer2_open_devvp(&devvpl, ronly);
1103 if (error) {
1104 hammer2_close_devvp(&devvpl, ronly);
1105 hammer2_cleanup_devvp(&devvpl);
1106 lockmgr(&hammer2_mntlk, LK_RELEASE);
1107 return error;
1108 }
1109
1110 /*
1111 * Construct volumes and link with device vnodes.
1112 */
1113 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
1114 hmp->devvp = NULL;
1115 error = hammer2_init_vfsvolumes(mp, &devvpl, hmp->volumes,
1116 &hmp->voldata, &hmp->volhdrno,
1117 &hmp->devvp);
1118 if (error) {
1119 hammer2_close_devvp(&devvpl, ronly);
1120 hammer2_cleanup_devvp(&devvpl);
1121 lockmgr(&hammer2_mntlk, LK_RELEASE);
1122 kfree(hmp, M_HAMMER2);
1123 return error;
1124 }
1125 if (!hmp->devvp) {
1126 kprintf("hammer2: failed to initialize root volume\n");
1127 hammer2_unmount_helper(mp, NULL, hmp);
1128 lockmgr(&hammer2_mntlk, LK_RELEASE);
1129 hammer2_vfs_unmount(mp, MNT_FORCE);
1130 return EINVAL;
1131 }
1132
1133 ksnprintf(hmp->devrepname, sizeof(hmp->devrepname), "%s", devstr);
1134 hmp->ronly = ronly;
1135 hmp->hflags = info.hflags & HMNT2_DEVFLAGS;
1136 kmalloc_create_obj(&hmp->mchain, "HAMMER2-chains",
1137 sizeof(struct hammer2_chain));
1138 kmalloc_create_obj(&hmp->mio, "HAMMER2-dio",
1139 sizeof(struct hammer2_io));
1140 kmalloc_create(&hmp->mmsg, "HAMMER2-msg");
1141 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
1142 RB_INIT(&hmp->iotree);
1143 hammer2_spin_init(&hmp->io_spin, "h2mount_io");
1144 hammer2_spin_init(&hmp->list_spin, "h2mount_list");
1145
1146 lockinit(&hmp->vollk, "h2vol", 0, 0);
1147 lockinit(&hmp->bulklk, "h2bulk", 0, 0);
1148 lockinit(&hmp->bflock, "h2bflk", 0, 0);
1149
1150 /*
1151 * vchain setup. vchain.data is embedded.
1152 * vchain.refs is initialized and will never drop to 0.
1153 */
1154 hmp->vchain.hmp = hmp;
1155 hmp->vchain.refs = 1;
1156 hmp->vchain.data = (void *)&hmp->voldata;
1157 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
1158 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1159 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1160 hammer2_chain_init(&hmp->vchain);
1161
1162 /*
1163 * fchain setup. fchain.data is embedded.
1164 * fchain.refs is initialized and will never drop to 0.
1165 *
1166 * The data is not used but needs to be initialized to
1167 * pass assertion muster. We use this chain primarily
1168 * as a placeholder for the freemap's top-level radix tree
1169 * so it does not interfere with the volume's topology
1170 * radix tree.
1171 */
1172 hmp->fchain.hmp = hmp;
1173 hmp->fchain.refs = 1;
1174 hmp->fchain.data = (void *)&hmp->voldata.freemap_blockset;
1175 hmp->fchain.bref.type = HAMMER2_BREF_TYPE_FREEMAP;
1176 hmp->fchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
1177 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1178 hmp->fchain.bref.methods =
1179 HAMMER2_ENC_CHECK(HAMMER2_CHECK_FREEMAP) |
1180 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE);
1181 hammer2_chain_init(&hmp->fchain);
1182
1183 /*
1184 * Initialize volume header related fields.
1185 */
1186 KKASSERT(hmp->voldata.magic == HAMMER2_VOLUME_ID_HBO ||
1187 hmp->voldata.magic == HAMMER2_VOLUME_ID_ABO);
1188 hmp->volsync = hmp->voldata;
1189 hmp->free_reserved = hmp->voldata.allocator_size / 20;
1190 /*
1191 * Must use hmp instead of volume header for these two
1192 * in order to handle volume versions transparently.
1193 */
1194 if (hmp->voldata.version >= HAMMER2_VOL_VERSION_MULTI_VOLUMES) {
1195 hmp->nvolumes = hmp->voldata.nvolumes;
1196 hmp->total_size = hmp->voldata.total_size;
1197 } else {
1198 hmp->nvolumes = 1;
1199 hmp->total_size = hmp->voldata.volu_size;
1200 }
1201 KKASSERT(hmp->nvolumes > 0);
1202
1203 /*
1204 * Move devvpl entries to hmp.
1205 */
1206 TAILQ_INIT(&hmp->devvpl);
1207 while ((e = TAILQ_FIRST(&devvpl)) != NULL) {
1208 TAILQ_REMOVE(&devvpl, e, entry);
1209 TAILQ_INSERT_TAIL(&hmp->devvpl, e, entry);
1210 }
1211 KKASSERT(TAILQ_EMPTY(&devvpl));
1212 KKASSERT(!TAILQ_EMPTY(&hmp->devvpl));
1213
1214 /*
1215 * Really important to get these right or the flush and
1216 * teardown code will get confused.
1217 */
1218 hmp->spmp = hammer2_pfsalloc(NULL, NULL, NULL);
1219 spmp = hmp->spmp;
1220 spmp->pfs_hmps[0] = hmp;
1221
1222 /*
1223 * Dummy-up vchain and fchain's modify_tid. mirror_tid
1224 * is inherited from the volume header.
1225 */
1226 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid;
1227 hmp->vchain.bref.modify_tid = hmp->vchain.bref.mirror_tid;
1228 hmp->vchain.pmp = spmp;
1229 hmp->fchain.bref.mirror_tid = hmp->voldata.freemap_tid;
1230 hmp->fchain.bref.modify_tid = hmp->fchain.bref.mirror_tid;
1231 hmp->fchain.pmp = spmp;
1232
1233 /*
1234 * First locate the super-root inode, which is key 0
1235 * relative to the volume header's blockset.
1236 *
1237 * Then locate the root inode by scanning the directory keyspace
1238 * represented by the label.
1239 */
1240 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
1241 schain = hammer2_chain_lookup(&parent, &key_dummy,
1242 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY,
1243 &error, 0);
1244 hammer2_chain_lookup_done(parent);
1245 if (schain == NULL) {
1246 kprintf("hammer2_mount: invalid super-root\n");
1247 hammer2_unmount_helper(mp, NULL, hmp);
1248 lockmgr(&hammer2_mntlk, LK_RELEASE);
1249 hammer2_vfs_unmount(mp, MNT_FORCE);
1250 return EINVAL;
1251 }
1252 if (schain->error) {
1253 kprintf("hammer2_mount: error %s reading super-root\n",
1254 hammer2_error_str(schain->error));
1255 hammer2_chain_unlock(schain);
1256 hammer2_chain_drop(schain);
1257 schain = NULL;
1258 hammer2_unmount_helper(mp, NULL, hmp);
1259 lockmgr(&hammer2_mntlk, LK_RELEASE);
1260 hammer2_vfs_unmount(mp, MNT_FORCE);
1261 return EINVAL;
1262 }
1263
1264 /*
1265 * The super-root always uses an inode_tid of 1 when
1266 * creating PFSs.
1267 */
1268 spmp->inode_tid = 1;
1269 spmp->modify_tid = schain->bref.modify_tid + 1;
1270
1271 /*
1272 * Sanity-check schain's pmp and finish initialization.
1273 * Any chain belonging to the super-root topology should
1274 * have a NULL pmp (not even set to spmp).
1275 */
1276 ripdata = &schain->data->ipdata;
1277 KKASSERT(schain->pmp == NULL);
1278 spmp->pfs_clid = ripdata->meta.pfs_clid;
1279
1280 /*
1281 * Replace the dummy spmp->iroot with a real one. It's
1282 * easier to just do a wholesale replacement than to try
1283 * to update the chain and fixup the iroot fields.
1284 *
1285 * The returned inode is locked with the supplied cluster.
1286 */
1287 hammer2_dummy_xop_from_chain(&xop, schain);
1288 hammer2_inode_drop(spmp->iroot);
1289 spmp->iroot = hammer2_inode_get(spmp, &xop, -1, -1);
1290 spmp->spmp_hmp = hmp;
1291 spmp->pfs_types[0] = ripdata->meta.pfs_type;
1292 spmp->pfs_hmps[0] = hmp;
1293 hammer2_inode_ref(spmp->iroot);
1294 hammer2_inode_unlock(spmp->iroot);
1295 hammer2_cluster_unlock(&xop.cluster);
1296 hammer2_chain_drop(schain);
1297 /* do not call hammer2_cluster_drop() on an embedded cluster */
1298 schain = NULL; /* now invalid */
1299 /* leave spmp->iroot with one ref */
1300
1301 if (!hmp->ronly) {
1302 error = hammer2_recovery(hmp);
1303 if (error == 0)
1304 error |= hammer2_fixup_pfses(hmp);
1305 /* XXX do something with error */
1306 }
1307 hammer2_update_pmps(hmp);
1308 hammer2_iocom_init(hmp);
1309 hammer2_bulkfree_init(hmp);
1310
1311 /*
1312 * Ref the cluster management messaging descriptor. The mount
1313 * program deals with the other end of the communications pipe.
1314 *
1315 * Root mounts typically do not supply one.
1316 */
1317 /*
1318 if (info.cluster_fd >= 0) {
1319 fp = holdfp(curthread, info.cluster_fd, -1);
1320 if (fp) {
1321 hammer2_cluster_reconnect(hmp, fp);
1322 } else {
1323 kprintf("hammer2_mount: bad cluster_fd!\n");
1324 }
1325 }
1326 */
1327 } else {
1328 spmp = hmp->spmp;
1329 if (info.hflags & HMNT2_DEVFLAGS) {
1330 kprintf("hammer2_mount: Warning: mount flags pertaining "
1331 "to the whole device may only be specified "
1332 "on the first mount of the device: %08x\n",
1333 info.hflags & HMNT2_DEVFLAGS);
1334 }
1335 }
1336
1337 /*
1338 * Force local mount (disassociate all PFSs from their clusters).
1339 * Used primarily for debugging.
1340 */
1341 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1342
1343 /*
1344 * Lookup the mount point under the media-localized super-root.
1345 * Scanning hammer2_pfslist doesn't help us because it represents
1346 * PFS cluster ids which can aggregate several named PFSs together.
1347 *
1348 * cluster->pmp will incorrectly point to spmp and must be fixed
1349 * up later on.
1350 */
1351 hammer2_inode_lock(spmp->iroot, 0);
1352 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1353 lhc = hammer2_dirhash(label, strlen(label));
1354 chain = hammer2_chain_lookup(&parent, &key_next,
1355 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
1356 &error, 0);
1357 while (chain) {
1358 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1359 strcmp(label, (char *)chain->data->ipdata.filename) == 0) {
1360 break;
1361 }
1362 chain = hammer2_chain_next(&parent, chain, &key_next,
1363 key_next,
1364 lhc + HAMMER2_DIRHASH_LOMASK,
1365 &error, 0);
1366 }
1367 if (parent) {
1368 hammer2_chain_unlock(parent);
1369 hammer2_chain_drop(parent);
1370 }
1371 hammer2_inode_unlock(spmp->iroot);
1372
1373 /*
1374 * PFS could not be found?
1375 */
1376 if (chain == NULL) {
1377 hammer2_unmount_helper(mp, NULL, hmp);
1378 lockmgr(&hammer2_mntlk, LK_RELEASE);
1379 hammer2_vfs_unmount(mp, MNT_FORCE);
1380
1381 if (error) {
1382 kprintf("hammer2_mount: PFS label I/O error\n");
1383 return EINVAL;
1384 } else {
1385 kprintf("hammer2_mount: PFS label \"%s\" not found\n",
1386 label);
1387 return ENOENT;
1388 }
1389 }
1390
1391 /*
1392 * Acquire the pmp structure (it should have already been allocated
1393 * via hammer2_update_pmps()).
1394 */
1395 if (chain->error) {
1396 kprintf("hammer2_mount: PFS label I/O error\n");
1397 } else {
1398 ripdata = &chain->data->ipdata;
1399 pmp = hammer2_pfsalloc(NULL, ripdata, force_local);
1400 }
1401 hammer2_chain_unlock(chain);
1402 hammer2_chain_drop(chain);
1403
1404 /*
1405 * PFS to mount must exist at this point.
1406 */
1407 if (pmp == NULL) {
1408 kprintf("hammer2_mount: Failed to acquire PFS structure\n");
1409 hammer2_unmount_helper(mp, NULL, hmp);
1410 lockmgr(&hammer2_mntlk, LK_RELEASE);
1411 hammer2_vfs_unmount(mp, MNT_FORCE);
1412 return EINVAL;
1413 }
1414
1415 /*
1416 * Finish the mount
1417 */
1418 kprintf("hammer2_mount: hmp=%p pmp=%p\n", hmp, pmp);
1419
1420 /* Check if the pmp has already been mounted. */
1421 if (pmp->mp) {
1422 kprintf("hammer2_mount: PFS already mounted!\n");
1423 hammer2_unmount_helper(mp, NULL, hmp);
1424 lockmgr(&hammer2_mntlk, LK_RELEASE);
1425 hammer2_vfs_unmount(mp, MNT_FORCE);
1426 return EBUSY;
1427 }
1428
1429 pmp->hflags = info.hflags;
1430 mp->mnt_flag |= MNT_LOCAL;
1431 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
1432 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
1433
1434 /*
1435 * required mount structure initializations
1436 */
1437 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
1438 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
1439
1440 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
1441 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
1442
1443 /*
1444 * Optional fields
1445 */
1446 mp->mnt_iosize_max = MAXPHYS;
1447
1448 /*
1449 * Connect up mount pointers.
1450 */
1451 hammer2_mount_helper(mp, pmp);
1452 lockmgr(&hammer2_mntlk, LK_RELEASE);
1453
1454 #if 0
1455 /*
1456 * Finish setup
1457 */
1458 vfs_getnewfsid(mp);
1459 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
1460 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
1461 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
1462
1463 if (path) {
1464 copyinstr(info.volume, mp->mnt_stat.f_mntfromname,
1465 MNAMELEN - 1, &size);
1466 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
1467 } /* else root mount, already in there */
1468
1469 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
1470 if (path) {
1471 copyinstr(path, mp->mnt_stat.f_mntonname,
1472 sizeof(mp->mnt_stat.f_mntonname) - 1,
1473 &size);
1474 } else {
1475 /* root mount */
1476 mp->mnt_stat.f_mntonname[0] = '/';
1477 }
1478 #endif
1479
1480 /*
1481 * Initial statfs to prime mnt_stat.
1482 */
1483 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1484 hammer2_vfs_statvfs(mp, &mp->mnt_vstat, NULL);
1485
1486 return 0;
1487 }
1488
1489 /*
1490 * Scan PFSs under the super-root and create hammer2_pfs structures.
1491 */
1492 static
1493 void
1494 hammer2_update_pmps(hammer2_dev_t *hmp)
1495 {
1496 const hammer2_inode_data_t *ripdata;
1497 hammer2_chain_t *parent;
1498 hammer2_chain_t *chain;
1499 hammer2_dev_t *force_local;
1500 hammer2_pfs_t *spmp;
1501 hammer2_key_t key_next;
1502 int error;
1503
1504 /*
1505 * Force local mount (disassociate all PFSs from their clusters).
1506 * Used primarily for debugging.
1507 */
1508 force_local = (hmp->hflags & HMNT2_LOCAL) ? hmp : NULL;
1509
1510 /*
1511 * Lookup mount point under the media-localized super-root.
1512 *
1513 * cluster->pmp will incorrectly point to spmp and must be fixed
1514 * up later on.
1515 */
1516 spmp = hmp->spmp;
1517 hammer2_inode_lock(spmp->iroot, 0);
1518 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
1519 chain = hammer2_chain_lookup(&parent, &key_next,
1520 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
1521 &error, 0);
1522 while (chain) {
1523 if (chain->error) {
1524 kprintf("I/O error scanning PFS labels\n");
1525 } else if (chain->bref.type != HAMMER2_BREF_TYPE_INODE) {
1526 kprintf("Non inode chain type %d under super-root\n",
1527 chain->bref.type);
1528 } else {
1529 ripdata = &chain->data->ipdata;
1530 hammer2_pfsalloc(chain, ripdata, force_local);
1531 }
1532 chain = hammer2_chain_next(&parent, chain, &key_next,
1533 key_next, HAMMER2_KEY_MAX,
1534 &error, 0);
1535 }
1536 if (parent) {
1537 hammer2_chain_unlock(parent);
1538 hammer2_chain_drop(parent);
1539 }
1540 hammer2_inode_unlock(spmp->iroot);
1541 }
1542
1543 #if 0
1544 static
1545 int
1546 hammer2_remount(hammer2_dev_t *hmp, struct mount *mp, char *path __unused,
1547 struct ucred *cred)
1548 {
1549 hammer2_volume_t *vol;
1550 struct m_vnode *devvp;
1551 int i, error, result = 0;
1552
1553 if (!(hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)))
1554 return 0;
1555
1556 for (i = 0; i < hmp->nvolumes; ++i) {
1557 vol = &hmp->volumes[i];
1558 devvp = vol->dev->devvp;
1559 KKASSERT(devvp);
1560 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1561 VOP_OPEN(devvp, FREAD | FWRITE, FSCRED, NULL);
1562 vn_unlock(devvp);
1563 error = 0;
1564 if (vol->id == HAMMER2_ROOT_VOLUME) {
1565 error = hammer2_recovery(hmp);
1566 if (error == 0)
1567 error |= hammer2_fixup_pfses(hmp);
1568 }
1569 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
1570 if (error == 0) {
1571 VOP_CLOSE(devvp, FREAD, NULL);
1572 } else {
1573 VOP_CLOSE(devvp, FREAD | FWRITE, NULL);
1574 }
1575 vn_unlock(devvp);
1576 result |= error;
1577 }
1578 if (result == 0) {
1579 kprintf("hammer2: enable read/write\n");
1580 hmp->ronly = 0;
1581 }
1582
1583 return result;
1584 }
1585 #endif
1586
1587 int
1588 hammer2_vfs_unmount(struct mount *mp, int mntflags)
1589 {
1590 hammer2_pfs_t *pmp;
1591 int flags;
1592 int error = 0;
1593
1594 pmp = MPTOPMP(mp);
1595
1596 if (pmp == NULL)
1597 return(0);
1598
1599 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
1600
1601 /*
1602 * If mount initialization proceeded far enough we must flush
1603 * its vnodes and sync the underlying mount points. Three syncs
1604 * are required to fully flush the filesystem (freemap updates lag
1605 * by one flush, and one extra for safety).
1606 */
1607 if (mntflags & MNT_FORCE)
1608 flags = FORCECLOSE;
1609 else
1610 flags = 0;
1611 if (pmp->iroot) {
1612 error = vflush(mp, 0, flags);
1613 if (error)
1614 goto failed;
1615 hammer2_vfs_sync(mp, MNT_WAIT);
1616 hammer2_vfs_sync(mp, MNT_WAIT);
1617 hammer2_vfs_sync(mp, MNT_WAIT);
1618 }
1619
1620 /*
1621 * Cleanup the frontend support XOPS threads
1622 */
1623 hammer2_xop_helper_cleanup(pmp);
1624
1625 if (pmp->mp)
1626 hammer2_unmount_helper(mp, pmp, NULL);
1627
1628 error = 0;
1629 failed:
1630 lockmgr(&hammer2_mntlk, LK_RELEASE);
1631
1632 return (error);
1633 }
1634
1635 /*
1636 * Mount helper, hook the system mount into our PFS.
1637 * The mount lock is held.
1638 *
1639 * We must bump the mount_count on related devices for any
1640 * mounted PFSs.
1641 */
1642 static
1643 void
1644 hammer2_mount_helper(struct mount *mp, hammer2_pfs_t *pmp)
1645 {
1646 hammer2_cluster_t *cluster;
1647 hammer2_chain_t *rchain;
1648 int i;
1649
1650 mp->mnt_data = (qaddr_t)pmp;
1651 pmp->mp = mp;
1652
1653 /*
1654 * After pmp->mp is set we have to adjust hmp->mount_count.
1655 */
1656 cluster = &pmp->iroot->cluster;
1657 for (i = 0; i < cluster->nchains; ++i) {
1658 rchain = cluster->array[i].chain;
1659 if (rchain == NULL)
1660 continue;
1661 ++rchain->hmp->mount_count;
1662 }
1663
1664 /*
1665 * Create missing Xop threads
1666 */
1667 hammer2_xop_helper_create(pmp);
1668 }
1669
1670 /*
1671 * Unmount helper, unhook the system mount from our PFS.
1672 * The mount lock is held.
1673 *
1674 * If hmp is supplied a mount responsible for being the first to open
1675 * the block device failed and the block device and all PFSs using the
1676 * block device must be cleaned up.
1677 *
1678 * If pmp is supplied multiple devices might be backing the PFS and each
1679 * must be disconnected. This might not be the last PFS using some of the
1680 * underlying devices. Also, we have to adjust our hmp->mount_count
1681 * accounting for the devices backing the pmp which is now undergoing an
1682 * unmount.
1683 */
1684 static
1685 void
1686 hammer2_unmount_helper(struct mount *mp, hammer2_pfs_t *pmp, hammer2_dev_t *hmp)
1687 {
1688 hammer2_cluster_t *cluster;
1689 hammer2_chain_t *rchain;
1690 int dumpcnt;
1691 int i;
1692
1693 /*
1694 * If no device supplied this is a high-level unmount and we have to
1695 * to disconnect the mount, adjust mount_count, and locate devices
1696 * that might now have no mounts.
1697 */
1698 if (pmp) {
1699 KKASSERT(hmp == NULL);
1700 KKASSERT(MPTOPMP(mp) == pmp);
1701 pmp->mp = NULL;
1702 mp->mnt_data = NULL;
1703
1704 /*
1705 * After pmp->mp is cleared we have to account for
1706 * mount_count.
1707 */
1708 cluster = &pmp->iroot->cluster;
1709 for (i = 0; i < cluster->nchains; ++i) {
1710 rchain = cluster->array[i].chain;
1711 if (rchain == NULL)
1712 continue;
1713 --rchain->hmp->mount_count;
1714 /* scrapping hmp now may invalidate the pmp */
1715 }
1716 again:
1717 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
1718 if (hmp->mount_count == 0) {
1719 hammer2_unmount_helper(NULL, NULL, hmp);
1720 goto again;
1721 }
1722 }
1723 return;
1724 }
1725
1726 /*
1727 * Try to terminate the block device. We can't terminate it if
1728 * there are still PFSs referencing it.
1729 */
1730 if (hmp->mount_count)
1731 return;
1732
1733 /*
1734 * Decomission the network before we start messing with the
1735 * device and PFS.
1736 */
1737 hammer2_iocom_uninit(hmp);
1738
1739 hammer2_bulkfree_uninit(hmp);
1740 hammer2_pfsfree_scan(hmp, 0);
1741
1742 /*
1743 * Cycle the volume data lock as a safety (probably not needed any
1744 * more). To ensure everything is out we need to flush at least
1745 * three times. (1) The running of the sideq can dirty the
1746 * filesystem, (2) A normal flush can dirty the freemap, and
1747 * (3) ensure that the freemap is fully synchronized.
1748 *
1749 * The next mount's recovery scan can clean everything up but we want
1750 * to leave the filesystem in a 100% clean state on a normal unmount.
1751 */
1752 #if 0
1753 hammer2_voldata_lock(hmp);
1754 hammer2_voldata_unlock(hmp);
1755 #endif
1756
1757 /*
1758 * Flush whatever is left. Unmounted but modified PFS's might still
1759 * have some dirty chains on them.
1760 */
1761 hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
1762 hammer2_chain_lock(&hmp->fchain, HAMMER2_RESOLVE_ALWAYS);
1763
1764 if (hmp->fchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1765 hammer2_voldata_modify(hmp);
1766 hammer2_flush(&hmp->fchain, HAMMER2_FLUSH_TOP |
1767 HAMMER2_FLUSH_ALL);
1768 }
1769 hammer2_chain_unlock(&hmp->fchain);
1770
1771 if (hmp->vchain.flags & HAMMER2_CHAIN_FLUSH_MASK) {
1772 hammer2_flush(&hmp->vchain, HAMMER2_FLUSH_TOP |
1773 HAMMER2_FLUSH_ALL);
1774 }
1775 hammer2_chain_unlock(&hmp->vchain);
1776
1777 if ((hmp->vchain.flags | hmp->fchain.flags) &
1778 HAMMER2_CHAIN_FLUSH_MASK) {
1779 kprintf("hammer2_unmount: chains left over after final sync\n");
1780 kprintf(" vchain %08x\n", hmp->vchain.flags);
1781 kprintf(" fchain %08x\n", hmp->fchain.flags);
1782
1783 if (hammer2_debug & 0x0010)
1784 Debugger("entered debugger");
1785 }
1786
1787 hammer2_pfsfree_scan(hmp, 1);
1788
1789 KKASSERT(hmp->spmp == NULL);
1790
1791 /*
1792 * Finish up with the device vnode
1793 */
1794 if (!TAILQ_EMPTY(&hmp->devvpl)) {
1795 hammer2_close_devvp(&hmp->devvpl, hmp->ronly);
1796 hammer2_cleanup_devvp(&hmp->devvpl);
1797 }
1798 KKASSERT(TAILQ_EMPTY(&hmp->devvpl));
1799
1800 /*
1801 * Clear vchain/fchain flags that might prevent final cleanup
1802 * of these chains.
1803 */
1804 if (hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) {
1805 atomic_add_long(&hammer2_count_modified_chains, -1);
1806 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
1807 hammer2_pfs_memory_wakeup(hmp->vchain.pmp, -1);
1808 }
1809 if (hmp->vchain.flags & HAMMER2_CHAIN_UPDATE) {
1810 atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_UPDATE);
1811 }
1812
1813 if (hmp->fchain.flags & HAMMER2_CHAIN_MODIFIED) {
1814 atomic_add_long(&hammer2_count_modified_chains, -1);
1815 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_MODIFIED);
1816 hammer2_pfs_memory_wakeup(hmp->fchain.pmp, -1);
1817 }
1818 if (hmp->fchain.flags & HAMMER2_CHAIN_UPDATE) {
1819 atomic_clear_int(&hmp->fchain.flags, HAMMER2_CHAIN_UPDATE);
1820 }
1821
1822 dumpcnt = 50;
1823 hammer2_dump_chain(&hmp->vchain, 0, 0, &dumpcnt, 'v', (u_int)-1);
1824 dumpcnt = 50;
1825 hammer2_dump_chain(&hmp->fchain, 0, 0, &dumpcnt, 'f', (u_int)-1);
1826
1827 /*
1828 * Final drop of embedded freemap root chain to
1829 * clean up fchain.core (fchain structure is not
1830 * flagged ALLOCATED so it is cleaned out and then
1831 * left to rot).
1832 */
1833 hammer2_chain_drop(&hmp->fchain);
1834
1835 /*
1836 * Final drop of embedded volume root chain to clean
1837 * up vchain.core (vchain structure is not flagged
1838 * ALLOCATED so it is cleaned out and then left to
1839 * rot).
1840 */
1841 hammer2_chain_drop(&hmp->vchain);
1842
1843 hammer2_io_cleanup(hmp, &hmp->iotree);
1844 if (hmp->iofree_count) {
1845 kprintf("io_cleanup: %d I/O's left hanging\n",
1846 hmp->iofree_count);
1847 }
1848
1849 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
1850 kmalloc_destroy_obj(&hmp->mchain);
1851 kmalloc_destroy_obj(&hmp->mio);
1852 kmalloc_destroy(&hmp->mmsg);
1853 kfree(hmp, M_HAMMER2);
1854 }
1855
1856 int
1857 hammer2_vfs_vget(struct mount *mp, struct m_vnode *dvp,
1858 ino_t ino, struct m_vnode **vpp)
1859 {
1860 hammer2_xop_lookup_t *xop;
1861 hammer2_pfs_t *pmp;
1862 hammer2_inode_t *ip;
1863 hammer2_tid_t inum;
1864 int error;
1865
1866 inum = (hammer2_tid_t)ino & HAMMER2_DIRHASH_USERMSK;
1867
1868 error = 0;
1869 pmp = MPTOPMP(mp);
1870
1871 /*
1872 * Easy if we already have it cached
1873 */
1874 ip = hammer2_inode_lookup(pmp, inum);
1875 if (ip) {
1876 hammer2_inode_lock(ip, HAMMER2_RESOLVE_SHARED);
1877 *vpp = hammer2_igetv(ip, &error);
1878 hammer2_inode_unlock(ip);
1879 hammer2_inode_drop(ip); /* from lookup */
1880
1881 return error;
1882 }
1883
1884 /*
1885 * Otherwise we have to find the inode
1886 */
1887 xop = hammer2_xop_alloc(pmp->iroot, 0);
1888 xop->lhc = inum;
1889 hammer2_xop_start(&xop->head, &hammer2_lookup_desc);
1890 error = hammer2_xop_collect(&xop->head, 0);
1891
1892 if (error == 0)
1893 ip = hammer2_inode_get(pmp, &xop->head, -1, -1);
1894 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1895
1896 if (ip) {
1897 *vpp = hammer2_igetv(ip, &error);
1898 hammer2_inode_unlock(ip);
1899 } else {
1900 *vpp = NULL;
1901 error = ENOENT;
1902 }
1903 return (error);
1904 }
1905
1906 int
1907 hammer2_vfs_root(struct mount *mp, struct m_vnode **vpp)
1908 {
1909 hammer2_pfs_t *pmp;
1910 struct m_vnode *vp;
1911 int error;
1912
1913 pmp = MPTOPMP(mp);
1914 if (pmp->iroot == NULL) {
1915 kprintf("hammer2 (%s): no root inode\n",
1916 mp->mnt_stat.f_mntfromname);
1917 *vpp = NULL;
1918 return EINVAL;
1919 }
1920
1921 error = 0;
1922 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1923
1924 while (pmp->inode_tid == 0) {
1925 hammer2_xop_ipcluster_t *xop;
1926 const hammer2_inode_meta_t *meta;
1927
1928 xop = hammer2_xop_alloc(pmp->iroot, HAMMER2_XOP_MODIFYING);
1929 hammer2_xop_start(&xop->head, &hammer2_ipcluster_desc);
1930 error = hammer2_xop_collect(&xop->head, 0);
1931
1932 if (error == 0) {
1933 meta = &hammer2_xop_gdata(&xop->head)->ipdata.meta;
1934 pmp->iroot->meta = *meta;
1935 pmp->inode_tid = meta->pfs_inum + 1;
1936 hammer2_xop_pdata(&xop->head);
1937 /* meta invalid */
1938
1939 if (pmp->inode_tid < HAMMER2_INODE_START)
1940 pmp->inode_tid = HAMMER2_INODE_START;
1941 pmp->modify_tid =
1942 xop->head.cluster.focus->bref.modify_tid + 1;
1943 #if 0
1944 kprintf("PFS: Starting inode %jd\n",
1945 (intmax_t)pmp->inode_tid);
1946 kprintf("PMP focus good set nextino=%ld mod=%016jx\n",
1947 pmp->inode_tid, pmp->modify_tid);
1948 #endif
1949 //wakeup(&pmp->iroot); XXX
1950
1951 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1952
1953 /*
1954 * Prime the mount info.
1955 */
1956 hammer2_vfs_statfs(mp, &mp->mnt_stat, NULL);
1957 break;
1958 }
1959
1960 /*
1961 * Loop, try again
1962 */
1963 hammer2_xop_retire(&xop->head, HAMMER2_XOPMASK_VOP);
1964 hammer2_inode_unlock(pmp->iroot);
1965 error = tsleep(&pmp->iroot, PCATCH, "h2root", hz);
1966 hammer2_inode_lock(pmp->iroot, HAMMER2_RESOLVE_SHARED);
1967 if (error == EINTR)
1968 break;
1969 }
1970
1971 if (error) {
1972 hammer2_inode_unlock(pmp->iroot);
1973 *vpp = NULL;
1974 } else {
1975 vp = hammer2_igetv(pmp->iroot, &error);
1976 hammer2_inode_unlock(pmp->iroot);
1977 *vpp = vp;
1978 }
1979
1980 return (error);
1981 }
1982
1983 /*
1984 * Filesystem status
1985 *
1986 * XXX incorporate ipdata->meta.inode_quota and data_quota
1987 */
1988 static
1989 int
1990 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1991 {
1992 hammer2_pfs_t *pmp;
1993 hammer2_dev_t *hmp;
1994 hammer2_blockref_t bref;
1995 struct statfs tmp;
1996 int i;
1997
1998 /*
1999 * NOTE: iroot might not have validated the cluster yet.
2000 */
2001 pmp = MPTOPMP(mp);
2002
2003 bzero(&tmp, sizeof(tmp));
2004
2005 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2006 hmp = pmp->pfs_hmps[i];
2007 if (hmp == NULL)
2008 continue;
2009 if (pmp->iroot->cluster.array[i].chain)
2010 bref = pmp->iroot->cluster.array[i].chain->bref;
2011 else
2012 bzero(&bref, sizeof(bref));
2013
2014 tmp.f_files = bref.embed.stats.inode_count;
2015 tmp.f_ffree = 0;
2016 tmp.f_blocks = hmp->voldata.allocator_size /
2017 mp->mnt_vstat.f_bsize;
2018 tmp.f_bfree = hmp->voldata.allocator_free /
2019 mp->mnt_vstat.f_bsize;
2020 tmp.f_bavail = tmp.f_bfree;
2021
2022 if (cred && cred->cr_uid != 0) {
2023 uint64_t adj;
2024
2025 /* 5% */
2026 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2027 tmp.f_blocks -= adj;
2028 tmp.f_bfree -= adj;
2029 tmp.f_bavail -= adj;
2030 }
2031
2032 mp->mnt_stat.f_blocks = tmp.f_blocks;
2033 mp->mnt_stat.f_bfree = tmp.f_bfree;
2034 mp->mnt_stat.f_bavail = tmp.f_bavail;
2035 mp->mnt_stat.f_files = tmp.f_files;
2036 mp->mnt_stat.f_ffree = tmp.f_ffree;
2037
2038 *sbp = mp->mnt_stat;
2039 }
2040 return (0);
2041 }
2042
2043 static
2044 int
2045 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
2046 {
2047 hammer2_pfs_t *pmp;
2048 hammer2_dev_t *hmp;
2049 hammer2_blockref_t bref;
2050 struct statvfs tmp;
2051 int i;
2052
2053 /*
2054 * NOTE: iroot might not have validated the cluster yet.
2055 */
2056 pmp = MPTOPMP(mp);
2057 bzero(&tmp, sizeof(tmp));
2058
2059 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
2060 hmp = pmp->pfs_hmps[i];
2061 if (hmp == NULL)
2062 continue;
2063 if (pmp->iroot->cluster.array[i].chain)
2064 bref = pmp->iroot->cluster.array[i].chain->bref;
2065 else
2066 bzero(&bref, sizeof(bref));
2067
2068 tmp.f_files = bref.embed.stats.inode_count;
2069 tmp.f_ffree = 0;
2070 tmp.f_blocks = hmp->voldata.allocator_size /
2071 mp->mnt_vstat.f_bsize;
2072 tmp.f_bfree = hmp->voldata.allocator_free /
2073 mp->mnt_vstat.f_bsize;
2074 tmp.f_bavail = tmp.f_bfree;
2075
2076 if (cred && cred->cr_uid != 0) {
2077 uint64_t adj;
2078
2079 /* 5% */
2080 adj = hmp->free_reserved / mp->mnt_vstat.f_bsize;
2081 tmp.f_blocks -= adj;
2082 tmp.f_bfree -= adj;
2083 tmp.f_bavail -= adj;
2084 }
2085
2086 mp->mnt_vstat.f_blocks = tmp.f_blocks;
2087 mp->mnt_vstat.f_bfree = tmp.f_bfree;
2088 mp->mnt_vstat.f_bavail = tmp.f_bavail;
2089 mp->mnt_vstat.f_files = tmp.f_files;
2090 mp->mnt_vstat.f_ffree = tmp.f_ffree;
2091
2092 *sbp = mp->mnt_vstat;
2093 }
2094 return (0);
2095 }
2096
2097 /*
2098 * Mount-time recovery (RW mounts)
2099 *
2100 * Updates to the free block table are allowed to lag flushes by one
2101 * transaction. In case of a crash, then on a fresh mount we must do an
2102 * incremental scan of the last committed transaction id and make sure that
2103 * all related blocks have been marked allocated.
2104 */
2105 struct hammer2_recovery_elm {
2106 TAILQ_ENTRY(hammer2_recovery_elm) entry;
2107 hammer2_chain_t *chain;
2108 hammer2_tid_t sync_tid;
2109 };
2110
2111 TAILQ_HEAD(hammer2_recovery_list, hammer2_recovery_elm);
2112
2113 struct hammer2_recovery_info {
2114 struct hammer2_recovery_list list;
2115 hammer2_tid_t mtid;
2116 int depth;
2117 };
2118
2119 static int hammer2_recovery_scan(hammer2_dev_t *hmp,
2120 hammer2_chain_t *parent,
2121 struct hammer2_recovery_info *info,
2122 hammer2_tid_t sync_tid);
2123
2124 #define HAMMER2_RECOVERY_MAXDEPTH 10
2125
2126 static
2127 int
2128 hammer2_recovery(hammer2_dev_t *hmp)
2129 {
2130 struct hammer2_recovery_info info;
2131 struct hammer2_recovery_elm *elm;
2132 hammer2_chain_t *parent;
2133 hammer2_tid_t sync_tid;
2134 hammer2_tid_t mirror_tid;
2135 int error;
2136
2137 hammer2_trans_init(hmp->spmp, 0);
2138
2139 sync_tid = hmp->voldata.freemap_tid;
2140 mirror_tid = hmp->voldata.mirror_tid;
2141
2142 kprintf("hammer2_mount: \"%s\": ", hmp->devrepname);
2143 if (sync_tid >= mirror_tid) {
2144 kprintf("no recovery needed\n");
2145 } else {
2146 kprintf("freemap recovery %016jx-%016jx\n",
2147 sync_tid + 1, mirror_tid);
2148 }
2149
2150 TAILQ_INIT(&info.list);
2151 info.depth = 0;
2152 parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
2153 error = hammer2_recovery_scan(hmp, parent, &info, sync_tid);
2154 hammer2_chain_lookup_done(parent);
2155
2156 while ((elm = TAILQ_FIRST(&info.list)) != NULL) {
2157 TAILQ_REMOVE(&info.list, elm, entry);
2158 parent = elm->chain;
2159 sync_tid = elm->sync_tid;
2160 kfree(elm, M_HAMMER2);
2161
2162 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2163 error |= hammer2_recovery_scan(hmp, parent, &info,
2164 hmp->voldata.freemap_tid);
2165 hammer2_chain_unlock(parent);
2166 hammer2_chain_drop(parent); /* drop elm->chain ref */
2167 }
2168
2169 hammer2_trans_done(hmp->spmp, 0);
2170
2171 return error;
2172 }
2173
2174 static
2175 int
2176 hammer2_recovery_scan(hammer2_dev_t *hmp, hammer2_chain_t *parent,
2177 struct hammer2_recovery_info *info,
2178 hammer2_tid_t sync_tid)
2179 {
2180 const hammer2_inode_data_t *ripdata;
2181 hammer2_chain_t *chain;
2182 hammer2_blockref_t bref;
2183 int tmp_error;
2184 int rup_error;
2185 int error;
2186 int first;
2187
2188 /*
2189 * Adjust freemap to ensure that the block(s) are marked allocated.
2190 */
2191 if (parent->bref.type != HAMMER2_BREF_TYPE_VOLUME) {
2192 hammer2_freemap_adjust(hmp, &parent->bref,
2193 HAMMER2_FREEMAP_DORECOVER);
2194 }
2195
2196 /*
2197 * Check type for recursive scan
2198 */
2199 switch(parent->bref.type) {
2200 case HAMMER2_BREF_TYPE_VOLUME:
2201 /* data already instantiated */
2202 break;
2203 case HAMMER2_BREF_TYPE_INODE:
2204 /*
2205 * Must instantiate data for DIRECTDATA test and also
2206 * for recursion.
2207 */
2208 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2209 ripdata = &parent->data->ipdata;
2210 if (ripdata->meta.op_flags & HAMMER2_OPFLAG_DIRECTDATA) {
2211 /* not applicable to recovery scan */
2212 hammer2_chain_unlock(parent);
2213 return 0;
2214 }
2215 hammer2_chain_unlock(parent);
2216 break;
2217 case HAMMER2_BREF_TYPE_INDIRECT:
2218 /*
2219 * Must instantiate data for recursion
2220 */
2221 hammer2_chain_lock(parent, HAMMER2_RESOLVE_ALWAYS);
2222 hammer2_chain_unlock(parent);
2223 break;
2224 case HAMMER2_BREF_TYPE_DIRENT:
2225 case HAMMER2_BREF_TYPE_DATA:
2226 case HAMMER2_BREF_TYPE_FREEMAP:
2227 case HAMMER2_BREF_TYPE_FREEMAP_NODE:
2228 case HAMMER2_BREF_TYPE_FREEMAP_LEAF:
2229 /* not applicable to recovery scan */
2230 return 0;
2231 break;
2232 default:
2233 return HAMMER2_ERROR_BADBREF;
2234 }
2235
2236 /*
2237 * Defer operation if depth limit reached.
2238 */
2239 if (info->depth >= HAMMER2_RECOVERY_MAXDEPTH) {
2240 struct hammer2_recovery_elm *elm;
2241
2242 elm = kmalloc(sizeof(*elm), M_HAMMER2, M_ZERO | M_WAITOK);
2243 elm->chain = parent;
2244 elm->sync_tid = sync_tid;
2245 hammer2_chain_ref(parent);
2246 TAILQ_INSERT_TAIL(&info->list, elm, entry);
2247 /* unlocked by caller */
2248
2249 return(0);
2250 }
2251
2252
2253 /*
2254 * Recursive scan of the last flushed transaction only. We are
2255 * doing this without pmp assignments so don't leave the chains
2256 * hanging around after we are done with them.
2257 *
2258 * error Cumulative error this level only
2259 * rup_error Cumulative error for recursion
2260 * tmp_error Specific non-cumulative recursion error
2261 */
2262 chain = NULL;
2263 first = 1;
2264 rup_error = 0;
2265 error = 0;
2266
2267 for (;;) {
2268 error |= hammer2_chain_scan(parent, &chain, &bref,
2269 &first,
2270 HAMMER2_LOOKUP_NODATA);
2271
2272 /*
2273 * Problem during scan or EOF
2274 */
2275 if (error)
2276 break;
2277
2278 /*
2279 * If this is a leaf
2280 */
2281 if (chain == NULL) {
2282 if (bref.mirror_tid > sync_tid) {
2283 hammer2_freemap_adjust(hmp, &bref,
2284 HAMMER2_FREEMAP_DORECOVER);
2285 }
2286 continue;
2287 }
2288
2289 /*
2290 * This may or may not be a recursive node.
2291 */
2292 atomic_set_int(&chain->flags, HAMMER2_CHAIN_RELEASE);
2293 if (bref.mirror_tid > sync_tid) {
2294 ++info->depth;
2295 tmp_error = hammer2_recovery_scan(hmp, chain,
2296 info, sync_tid);
2297 --info->depth;
2298 } else {
2299 tmp_error = 0;
2300 }
2301
2302 /*
2303 * Flush the recovery at the PFS boundary to stage it for
2304 * the final flush of the super-root topology.
2305 */
2306 if (tmp_error == 0 &&
2307 (bref.flags & HAMMER2_BREF_FLAG_PFSROOT) &&
2308 (chain->flags & HAMMER2_CHAIN_ONFLUSH)) {
2309 hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2310 HAMMER2_FLUSH_ALL);
2311 }
2312 rup_error |= tmp_error;
2313 }
2314 return ((error | rup_error) & ~HAMMER2_ERROR_EOF);
2315 }
2316
2317 /*
2318 * This fixes up an error introduced in earlier H2 implementations where
2319 * moving a PFS inode into an indirect block wound up causing the
2320 * HAMMER2_BREF_FLAG_PFSROOT flag in the bref to get cleared.
2321 */
2322 static
2323 int
2324 hammer2_fixup_pfses(hammer2_dev_t *hmp)
2325 {
2326 const hammer2_inode_data_t *ripdata;
2327 hammer2_chain_t *parent;
2328 hammer2_chain_t *chain;
2329 hammer2_key_t key_next;
2330 hammer2_pfs_t *spmp;
2331 int error;
2332
2333 error = 0;
2334
2335 /*
2336 * Lookup mount point under the media-localized super-root.
2337 *
2338 * cluster->pmp will incorrectly point to spmp and must be fixed
2339 * up later on.
2340 */
2341 spmp = hmp->spmp;
2342 hammer2_inode_lock(spmp->iroot, 0);
2343 parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
2344 chain = hammer2_chain_lookup(&parent, &key_next,
2345 HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
2346 &error, 0);
2347 while (chain) {
2348 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
2349 continue;
2350 if (chain->error) {
2351 kprintf("I/O error scanning PFS labels\n");
2352 error |= chain->error;
2353 } else if ((chain->bref.flags &
2354 HAMMER2_BREF_FLAG_PFSROOT) == 0) {
2355 int error2;
2356
2357 ripdata = &chain->data->ipdata;
2358 hammer2_trans_init(hmp->spmp, 0);
2359 error2 = hammer2_chain_modify(chain,
2360 chain->bref.modify_tid,
2361 0, 0);
2362 if (error2 == 0) {
2363 kprintf("hammer2: Correct mis-flagged PFS %s\n",
2364 ripdata->filename);
2365 chain->bref.flags |= HAMMER2_BREF_FLAG_PFSROOT;
2366 } else {
2367 error |= error2;
2368 }
2369 hammer2_flush(chain, HAMMER2_FLUSH_TOP |
2370 HAMMER2_FLUSH_ALL);
2371 hammer2_trans_done(hmp->spmp, 0);
2372 }
2373 chain = hammer2_chain_next(&parent, chain, &key_next,
2374 key_next, HAMMER2_KEY_MAX,
2375 &error, 0);
2376 }
2377 if (parent) {
2378 hammer2_chain_unlock(parent);
2379 hammer2_chain_drop(parent);
2380 }
2381 hammer2_inode_unlock(spmp->iroot);
2382
2383 return error;
2384 }
2385
2386 /*
2387 * Sync a mount point; this is called periodically on a per-mount basis from
2388 * the filesystem syncer, and whenever a user issues a sync.
2389 */
2390 int
2391 hammer2_vfs_sync(struct mount *mp, int waitfor)
2392 {
2393 int error;
2394
2395 error = hammer2_vfs_sync_pmp(MPTOPMP(mp), waitfor);
2396
2397 return error;
2398 }
2399
2400 /*
2401 * Because frontend operations lock vnodes before we get a chance to
2402 * lock the related inode, we can't just acquire a vnode lock without
2403 * risking a deadlock. The frontend may be holding a vnode lock while
2404 * also blocked on our SYNCQ flag while trying to get the inode lock.
2405 *
2406 * To deal with this situation we can check the vnode lock situation
2407 * after locking the inode and perform a work-around.
2408 */
2409 int
2410 hammer2_vfs_sync_pmp(hammer2_pfs_t *pmp, int waitfor)
2411 {
2412 hammer2_inode_t *ip;
2413 hammer2_depend_t *depend;
2414 hammer2_depend_t *depend_next;
2415 struct m_vnode *vp;
2416 uint32_t pass2;
2417 int error;
2418 int wakecount;
2419 int dorestart;
2420
2421 /*
2422 * Move all inodes on sideq to syncq. This will clear sideq.
2423 * This should represent all flushable inodes. These inodes
2424 * will already have refs due to being on syncq or sideq. We
2425 * must do this all at once with the spinlock held to ensure that
2426 * all inode dependencies are part of the same flush.
2427 *
2428 * We should be able to do this asynchronously from frontend
2429 * operations because we will be locking the inodes later on
2430 * to actually flush them, and that will partition any frontend
2431 * op using the same inode. Either it has already locked the
2432 * inode and we will block, or it has not yet locked the inode
2433 * and it will block until we are finished flushing that inode.
2434 *
2435 * When restarting, only move the inodes flagged as PASS2 from
2436 * SIDEQ to SYNCQ. PASS2 propagation by inode_lock4() and
2437 * inode_depend() are atomic with the spin-lock.
2438 */
2439 hammer2_trans_init(pmp, HAMMER2_TRANS_ISFLUSH);
2440 #ifdef HAMMER2_DEBUG_SYNC
2441 kprintf("FILESYSTEM SYNC BOUNDARY\n");
2442 #endif
2443 dorestart = 0;
2444
2445 /*
2446 * Move inodes from depq to syncq, releasing the related
2447 * depend structures.
2448 */
2449 restart:
2450 #ifdef HAMMER2_DEBUG_SYNC
2451 kprintf("FILESYSTEM SYNC RESTART (%d)\n", dorestart);
2452 #endif
2453 hammer2_trans_setflags(pmp, 0/*HAMMER2_TRANS_COPYQ*/);
2454 hammer2_trans_clearflags(pmp, HAMMER2_TRANS_RESCAN);
2455
2456 /*
2457 * Move inodes from depq to syncq. When restarting, only depq's
2458 * marked pass2 are moved.
2459 */
2460 hammer2_spin_ex(&pmp->list_spin);
2461 depend_next = TAILQ_FIRST(&pmp->depq);
2462 wakecount = 0;
2463
2464 while ((depend = depend_next) != NULL) {
2465 depend_next = TAILQ_NEXT(depend, entry);
2466 if (dorestart && depend->pass2 == 0)
2467 continue;
2468 TAILQ_FOREACH(ip, &depend->sideq, entry) {
2469 KKASSERT(ip->flags & HAMMER2_INODE_SIDEQ);
2470 atomic_set_int(&ip->flags, HAMMER2_INODE_SYNCQ);
2471 atomic_clear_int(&ip->flags, HAMMER2_INODE_SIDEQ);
2472 ip->depend = NULL;
2473 }
2474
2475 /*
2476 * NOTE: pmp->sideq_count includes both sideq and syncq
2477 */
2478 TAILQ_CONCAT(&pmp->syncq, &depend->sideq, entry);
2479
2480 depend->count = 0;
2481 depend->pass2 = 0;
2482 TAILQ_REMOVE(&pmp->depq, depend, entry);
2483 }
2484
2485 hammer2_spin_unex(&pmp->list_spin);
2486 hammer2_trans_clearflags(pmp, /*HAMMER2_TRANS_COPYQ |*/
2487 HAMMER2_TRANS_WAITING);
2488 dorestart = 0;
2489
2490 /*
2491 * sideq_count may have dropped enough to allow us to unstall
2492 * the frontend.
2493 */
2494 hammer2_pfs_memory_wakeup(pmp, 0);
2495
2496 /*
2497 * Now run through all inodes on syncq.
2498 *
2499 * Flush transactions only interlock with other flush transactions.
2500 * Any conflicting frontend operations will block on the inode, but
2501 * may hold a vnode lock while doing so.
2502 */
2503 hammer2_spin_ex(&pmp->list_spin);
2504 while ((ip = TAILQ_FIRST(&pmp->syncq)) != NULL) {
2505 /*
2506 * Remove the inode from the SYNCQ, transfer the syncq ref
2507 * to us. We must clear SYNCQ to allow any potential
2508 * front-end deadlock to proceed. We must set PASS2 so
2509 * the dependency code knows what to do.
2510 */
2511 pass2 = ip->flags;
2512 cpu_ccfence();
2513 if (atomic_cmpset_int(&ip->flags,
2514 pass2,
2515 (pass2 & ~(HAMMER2_INODE_SYNCQ |
2516 HAMMER2_INODE_SYNCQ_WAKEUP)) |
2517 HAMMER2_INODE_SYNCQ_PASS2) == 0)
2518 {
2519 continue;
2520 }
2521 TAILQ_REMOVE(&pmp->syncq, ip, entry);
2522 --pmp->sideq_count;
2523 hammer2_spin_unex(&pmp->list_spin);
2524
2525 /*
2526 * Tickle anyone waiting on ip->flags or the hysteresis
2527 * on the dirty inode count.
2528 */
2529 if (pass2 & HAMMER2_INODE_SYNCQ_WAKEUP)
2530 wakeup(&ip->flags);
2531 if (++wakecount >= hammer2_limit_dirty_inodes / 20 + 1) {
2532 wakecount = 0;
2533 hammer2_pfs_memory_wakeup(pmp, 0);
2534 }
2535
2536 /*
2537 * Relock the inode, and we inherit a ref from the above.
2538 * We will check for a race after we acquire the vnode.
2539 */
2540 hammer2_mtx_ex(&ip->lock);
2541
2542 /*
2543 * We need the vp in order to vfsync() dirty buffers, so if
2544 * one isn't attached we can skip it.
2545 *
2546 * Ordering the inode lock and then the vnode lock has the
2547 * potential to deadlock. If we had left SYNCQ set that could
2548 * also deadlock us against the frontend even if we don't hold
2549 * any locks, but the latter is not a problem now since we
2550 * cleared it. igetv will temporarily release the inode lock
2551 * in a safe manner to work-around the deadlock.
2552 *
2553 * Unfortunately it is still possible to deadlock when the
2554 * frontend obtains multiple inode locks, because all the
2555 * related vnodes are already locked (nor can the vnode locks
2556 * be released and reacquired without messing up RECLAIM and
2557 * INACTIVE sequencing).
2558 *
2559 * The solution for now is to move the vp back onto SIDEQ
2560 * and set dorestart, which will restart the flush after we
2561 * exhaust the current SYNCQ. Note that additional
2562 * dependencies may build up, so we definitely need to move
2563 * the whole SIDEQ back to SYNCQ when we restart.
2564 */
2565 vp = ip->vp;
2566 if (vp) {
2567 if (vget(vp, LK_EXCLUSIVE|LK_NOWAIT)) {
2568 /*
2569 * Failed to get the vnode, requeue the inode
2570 * (PASS2 is already set so it will be found
2571 * again on the restart).
2572 *
2573 * Then unlock, possibly sleep, and retry
2574 * later. We sleep if PASS2 was *previously*
2575 * set, before we set it again above.
2576 */
2577 vp = NULL;
2578 dorestart = 1;
2579 #ifdef HAMMER2_DEBUG_SYNC
2580 kprintf("inum %ld (sync delayed by vnode)\n",
2581 (long)ip->meta.inum);
2582 #endif
2583 hammer2_inode_delayed_sideq(ip);
2584
2585 hammer2_mtx_unlock(&ip->lock);
2586 hammer2_inode_drop(ip);
2587
2588 if (pass2 & HAMMER2_INODE_SYNCQ_PASS2) {
2589 tsleep(&dorestart, 0, "h2syndel", 2);
2590 }
2591 hammer2_spin_ex(&pmp->list_spin);
2592 continue;
2593 }
2594 } else {
2595 vp = NULL;
2596 }
2597
2598 /*
2599 * If the inode wound up on a SIDEQ again it will already be
2600 * prepped for another PASS2. In this situation if we flush
2601 * it now we will just wind up flushing it again in the same
2602 * syncer run, so we might as well not flush it now.
2603 */
2604 if (ip->flags & HAMMER2_INODE_SIDEQ) {
2605 hammer2_mtx_unlock(&ip->lock);
2606 hammer2_inode_drop(ip);
2607 if (vp)
2608 vput(vp);
2609 dorestart = 1;
2610 hammer2_spin_ex(&pmp->list_spin);
2611 continue;
2612 }
2613
2614 /*
2615 * Ok we have the inode exclusively locked and if vp is
2616 * not NULL that will also be exclusively locked. Do the
2617 * meat of the flush.
2618 *
2619 * vp token needed for v_rbdirty_tree check / vclrisdirty
2620 * sequencing. Though we hold the vnode exclusively so
2621 * we shouldn't need to hold the token also in this case.
2622 */
2623 if (vp) {
2624 vfsync(vp, MNT_WAIT, 1, NULL, NULL);
2625 bio_track_wait(NULL, 0, 0); /* XXX */
2626 }
2627
2628 /*
2629 * If the inode has not yet been inserted into the tree
2630 * we must do so. Then sync and flush it. The flush should
2631 * update the parent.
2632 */
2633 if (ip->flags & HAMMER2_INODE_DELETING) {
2634 #ifdef HAMMER2_DEBUG_SYNC
2635 kprintf("inum %ld destroy\n", (long)ip->meta.inum);
2636 #endif
2637 hammer2_inode_chain_des(ip);
2638 atomic_add_long(&hammer2_iod_inode_deletes, 1);
2639 } else if (ip->flags & HAMMER2_INODE_CREATING) {
2640 #ifdef HAMMER2_DEBUG_SYNC
2641 kprintf("inum %ld insert\n", (long)ip->meta.inum);
2642 #endif
2643 hammer2_inode_chain_ins(ip);
2644 atomic_add_long(&hammer2_iod_inode_creates, 1);
2645 }
2646 #ifdef HAMMER2_DEBUG_SYNC
2647 kprintf("inum %ld chain-sync\n", (long)ip->meta.inum);
2648 #endif
2649
2650 /*
2651 * Because I kinda messed up the design and index the inodes
2652 * under the root inode, along side the directory entries,
2653 * we can't flush the inode index under the iroot until the
2654 * end. If we do it now we might miss effects created by
2655 * other inodes on the SYNCQ.
2656 *
2657 * Do a normal (non-FSSYNC) flush instead, which allows the
2658 * vnode code to work the same. We don't want to force iroot
2659 * back onto the SIDEQ, and we also don't want the flush code
2660 * to update pfs_iroot_blocksets until the final flush later.
2661 *
2662 * XXX at the moment this will likely result in a double-flush
2663 * of the iroot chain.
2664 */
2665 hammer2_inode_chain_sync(ip);
2666 if (ip == pmp->iroot) {
2667 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP);
2668 } else {
2669 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP |
2670 HAMMER2_XOP_FSSYNC);
2671 }
2672 if (vp) {
2673 lwkt_gettoken(NULL);
2674 if ((ip->flags & (HAMMER2_INODE_MODIFIED |
2675 HAMMER2_INODE_RESIZED |
2676 HAMMER2_INODE_DIRTYDATA)) == 0) {
2677 //RB_EMPTY(&vp->v_rbdirty_tree) &&
2678 //!bio_track_active(&vp->v_track_write)) {
2679 vclrisdirty(vp);
2680 } else {
2681 hammer2_inode_delayed_sideq(ip);
2682 }
2683 lwkt_reltoken(NULL);
2684 vput(vp);
2685 vp = NULL; /* safety */
2686 }
2687 atomic_clear_int(&ip->flags, HAMMER2_INODE_SYNCQ_PASS2);
2688 hammer2_inode_unlock(ip); /* unlock+drop */
2689 /* ip pointer invalid */
2690
2691 /*
2692 * If the inode got dirted after we dropped our locks,
2693 * it will have already been moved back to the SIDEQ.
2694 */
2695 hammer2_spin_ex(&pmp->list_spin);
2696 }
2697 hammer2_spin_unex(&pmp->list_spin);
2698 hammer2_pfs_memory_wakeup(pmp, 0);
2699
2700 if (dorestart || (pmp->trans.flags & HAMMER2_TRANS_RESCAN)) {
2701 #ifdef HAMMER2_DEBUG_SYNC
2702 kprintf("FILESYSTEM SYNC STAGE 1 RESTART\n");
2703 /*tsleep(&dorestart, 0, "h2STG1-R", hz*20);*/
2704 #endif
2705 dorestart = 1;
2706 goto restart;
2707 }
2708 #ifdef HAMMER2_DEBUG_SYNC
2709 kprintf("FILESYSTEM SYNC STAGE 2 BEGIN\n");
2710 /*tsleep(&dorestart, 0, "h2STG2", hz*20);*/
2711 #endif
2712
2713 /*
2714 * We have to flush the PFS root last, even if it does not appear to
2715 * be dirty, because all the inodes in the PFS are indexed under it.
2716 * The normal flushing of iroot above would only occur if directory
2717 * entries under the root were changed.
2718 *
2719 * Specifying VOLHDR will cause an additionl flush of hmp->spmp
2720 * for the media making up the cluster.
2721 */
2722 if ((ip = pmp->iroot) != NULL) {
2723 hammer2_inode_ref(ip);
2724 hammer2_mtx_ex(&ip->lock);
2725 hammer2_inode_chain_sync(ip);
2726 hammer2_inode_chain_flush(ip, HAMMER2_XOP_INODE_STOP |
2727 HAMMER2_XOP_FSSYNC |
2728 HAMMER2_XOP_VOLHDR);
2729 hammer2_inode_unlock(ip); /* unlock+drop */
2730 }
2731 #ifdef HAMMER2_DEBUG_SYNC
2732 kprintf("FILESYSTEM SYNC STAGE 2 DONE\n");
2733 #endif
2734
2735 /*
2736 * device bioq sync
2737 */
2738 hammer2_bioq_sync(pmp);
2739
2740 error = 0; /* XXX */
2741 hammer2_trans_done(pmp, HAMMER2_TRANS_ISFLUSH);
2742
2743 return (error);
2744 }
2745
2746 #if 0
2747 static
2748 int
2749 hammer2_vfs_vptofh(struct m_vnode *vp, struct fid *fhp)
2750 {
2751 hammer2_inode_t *ip;
2752
2753 KKASSERT(MAXFIDSZ >= 16);
2754 ip = VTOI(vp);
2755 fhp->fid_len = offsetof(struct fid, fid_data[16]);
2756 fhp->fid_ext = 0;
2757 ((hammer2_tid_t *)fhp->fid_data)[0] = ip->meta.inum;
2758 ((hammer2_tid_t *)fhp->fid_data)[1] = 0;
2759
2760 return 0;
2761 }
2762
2763 static
2764 int
2765 hammer2_vfs_fhtovp(struct mount *mp, struct m_vnode *rootvp,
2766 struct fid *fhp, struct m_vnode **vpp)
2767 {
2768 hammer2_tid_t inum;
2769 int error;
2770
2771 inum = ((hammer2_tid_t *)fhp->fid_data)[0] & HAMMER2_DIRHASH_USERMSK;
2772 if (vpp) {
2773 if (inum == 1)
2774 error = hammer2_vfs_root(mp, vpp);
2775 else
2776 error = hammer2_vfs_vget(mp, NULL, inum, vpp);
2777 } else {
2778 error = 0;
2779 }
2780 return error;
2781 }
2782
2783 static
2784 int
2785 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
2786 int *exflagsp, struct ucred **credanonp)
2787 {
2788 hammer2_pfs_t *pmp;
2789 struct netcred *np;
2790 int error;
2791
2792 pmp = MPTOPMP(mp);
2793 np = vfs_export_lookup(mp, &pmp->export, nam);
2794 if (np) {
2795 *exflagsp = np->netc_exflags;
2796 *credanonp = &np->netc_anon;
2797 error = 0;
2798 } else {
2799 error = EACCES;
2800 }
2801 return error;
2802 }
2803 #endif
2804
2805 /*
2806 * This handles hysteresis on regular file flushes. Because the BIOs are
2807 * routed to a thread it is possible for an excessive number to build up
2808 * and cause long front-end stalls long before the runningbuffspace limit
2809 * is hit, so we implement hammer2_flush_pipe to control the
2810 * hysteresis.
2811 *
2812 * This is a particular problem when compression is used.
2813 */
2814 void
2815 hammer2_lwinprog_ref(hammer2_pfs_t *pmp)
2816 {
2817 atomic_add_int(&pmp->count_lwinprog, 1);
2818 }
2819
2820 void
2821 hammer2_lwinprog_drop(hammer2_pfs_t *pmp)
2822 {
2823 #if 0
2824 int lwinprog;
2825
2826 lwinprog = atomic_fetchadd_int(&pmp->count_lwinprog, -1);
2827 if ((lwinprog & HAMMER2_LWINPROG_WAITING) &&
2828 (lwinprog & HAMMER2_LWINPROG_MASK) <= hammer2_flush_pipe * 2 / 3) {
2829 atomic_clear_int(&pmp->count_lwinprog,
2830 HAMMER2_LWINPROG_WAITING);
2831 wakeup(&pmp->count_lwinprog);
2832 }
2833 if ((lwinprog & HAMMER2_LWINPROG_WAITING0) &&
2834 (lwinprog & HAMMER2_LWINPROG_MASK) <= 0) {
2835 atomic_clear_int(&pmp->count_lwinprog,
2836 HAMMER2_LWINPROG_WAITING0);
2837 wakeup(&pmp->count_lwinprog);
2838 }
2839 #endif
2840 }
2841
2842 void
2843 hammer2_lwinprog_wait(hammer2_pfs_t *pmp, int flush_pipe)
2844 {
2845 #if 0
2846 int lwinprog;
2847 int lwflag = (flush_pipe) ? HAMMER2_LWINPROG_WAITING :
2848 HAMMER2_LWINPROG_WAITING0;
2849
2850 for (;;) {
2851 lwinprog = pmp->count_lwinprog;
2852 cpu_ccfence();
2853 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2854 break;
2855 tsleep_interlock(&pmp->count_lwinprog, 0);
2856 atomic_set_int(&pmp->count_lwinprog, lwflag);
2857 lwinprog = pmp->count_lwinprog;
2858 if ((lwinprog & HAMMER2_LWINPROG_MASK) <= flush_pipe)
2859 break;
2860 tsleep(&pmp->count_lwinprog, PINTERLOCKED, "h2wpipe", hz);
2861 }
2862 #endif
2863 }
2864
2865 #if 0
2866 /*
2867 * It is possible for an excessive number of dirty chains or dirty inodes
2868 * to build up. When this occurs we start an asynchronous filesystem sync.
2869 * If the level continues to build up, we stall, waiting for it to drop,
2870 * with some hysteresis.
2871 *
2872 * This relies on the kernel calling hammer2_vfs_modifying() prior to
2873 * obtaining any vnode locks before making a modifying VOP call.
2874 */
2875 static int
2876 hammer2_vfs_modifying(struct mount *mp)
2877 {
2878 if (mp->mnt_flag & MNT_RDONLY)
2879 return EROFS;
2880 hammer2_pfs_memory_wait(MPTOPMP(mp));
2881
2882 return 0;
2883 }
2884 #endif
2885
2886 /*
2887 * Initiate an asynchronous filesystem sync and, with hysteresis,
2888 * stall if the internal data structure count becomes too bloated.
2889 */
2890 void
2891 hammer2_pfs_memory_wait(hammer2_pfs_t *pmp)
2892 {
2893 uint32_t waiting;
2894 int pcatch;
2895 int error;
2896
2897 if (pmp == NULL || pmp->mp == NULL)
2898 return;
2899
2900 for (;;) {
2901 waiting = pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK;
2902 cpu_ccfence();
2903
2904 /*
2905 * Start the syncer running at 1/2 the limit
2906 */
2907 if (waiting > hammer2_limit_dirty_chains / 2 ||
2908 pmp->sideq_count > hammer2_limit_dirty_inodes / 2) {
2909 trigger_syncer(pmp->mp);
2910 }
2911
2912 /*
2913 * Stall at the limit waiting for the counts to drop.
2914 * This code will typically be woken up once the count
2915 * drops below 3/4 the limit, or in one second.
2916 */
2917 if (waiting < hammer2_limit_dirty_chains &&
2918 pmp->sideq_count < hammer2_limit_dirty_inodes) {
2919 break;
2920 }
2921
2922 pcatch = curthread->td_proc ? PCATCH : 0;
2923
2924 tsleep_interlock(&pmp->inmem_dirty_chains, pcatch);
2925 atomic_set_int(&pmp->inmem_dirty_chains,
2926 HAMMER2_DIRTYCHAIN_WAITING);
2927 if (waiting < hammer2_limit_dirty_chains &&
2928 pmp->sideq_count < hammer2_limit_dirty_inodes) {
2929 break;
2930 }
2931 trigger_syncer(pmp->mp);
2932 error = tsleep(&pmp->inmem_dirty_chains, PINTERLOCKED | pcatch,
2933 "h2memw", hz);
2934 if (error == ERESTART)
2935 break;
2936 }
2937 }
2938
2939 /*
2940 * Wake up any stalled frontend ops waiting, with hysteresis, using
2941 * 2/3 of the limit.
2942 */
2943 void
2944 hammer2_pfs_memory_wakeup(hammer2_pfs_t *pmp, int count)
2945 {
2946 uint32_t waiting;
2947
2948 if (pmp) {
2949 waiting = atomic_fetchadd_int(&pmp->inmem_dirty_chains, count);
2950 /* don't need --waiting to test flag */
2951
2952 if ((waiting & HAMMER2_DIRTYCHAIN_WAITING) &&
2953 (pmp->inmem_dirty_chains & HAMMER2_DIRTYCHAIN_MASK) <=
2954 hammer2_limit_dirty_chains * 2 / 3 &&
2955 pmp->sideq_count <= hammer2_limit_dirty_inodes * 2 / 3) {
2956 atomic_clear_int(&pmp->inmem_dirty_chains,
2957 HAMMER2_DIRTYCHAIN_WAITING);
2958 wakeup(&pmp->inmem_dirty_chains);
2959 }
2960 }
2961 }
2962
2963 void
2964 hammer2_pfs_memory_inc(hammer2_pfs_t *pmp)
2965 {
2966 if (pmp) {
2967 atomic_add_int(&pmp->inmem_dirty_chains, 1);
2968 }
2969 }
2970
2971 /*
2972 * Volume header data locks
2973 */
2974 void
2975 hammer2_voldata_lock(hammer2_dev_t *hmp)
2976 {
2977 lockmgr(&hmp->vollk, LK_EXCLUSIVE);
2978 }
2979
2980 void
2981 hammer2_voldata_unlock(hammer2_dev_t *hmp)
2982 {
2983 lockmgr(&hmp->vollk, LK_RELEASE);
2984 }
2985
2986 /*
2987 * Caller indicates that the volume header is being modified. Flag
2988 * the related chain and adjust its transaction id.
2989 *
2990 * The transaction id is set to voldata.mirror_tid + 1, similar to
2991 * what hammer2_chain_modify() does. Be very careful here, volume
2992 * data can be updated independently of the rest of the filesystem.
2993 */
2994 void
2995 hammer2_voldata_modify(hammer2_dev_t *hmp)
2996 {
2997 if ((hmp->vchain.flags & HAMMER2_CHAIN_MODIFIED) == 0) {
2998 atomic_add_long(&hammer2_count_modified_chains, 1);
2999 atomic_set_int(&hmp->vchain.flags, HAMMER2_CHAIN_MODIFIED);
3000 hammer2_pfs_memory_inc(hmp->vchain.pmp);
3001 hmp->vchain.bref.mirror_tid = hmp->voldata.mirror_tid + 1;
3002 }
3003 }
3004
3005 /*
3006 * Returns 0 if the filesystem has tons of free space
3007 * Returns 1 if the filesystem has less than 10% remaining
3008 * Returns 2 if the filesystem has less than 2%/5% (user/root) remaining.
3009 */
3010 int
3011 hammer2_vfs_enospace(hammer2_inode_t *ip, off_t bytes, struct ucred *cred)
3012 {
3013 hammer2_pfs_t *pmp;
3014 hammer2_dev_t *hmp;
3015 hammer2_off_t free_reserved;
3016 hammer2_off_t free_nominal;
3017 int i;
3018
3019 pmp = ip->pmp;
3020
3021 if (/*XXX*/ 1 || pmp->free_ticks == 0 || pmp->free_ticks != ticks) {
3022 free_reserved = HAMMER2_SEGSIZE;
3023 free_nominal = 0x7FFFFFFFFFFFFFFFLLU;
3024 for (i = 0; i < pmp->iroot->cluster.nchains; ++i) {
3025 hmp = pmp->pfs_hmps[i];
3026 if (hmp == NULL)
3027 continue;
3028 if (pmp->pfs_types[i] != HAMMER2_PFSTYPE_MASTER &&
3029 pmp->pfs_types[i] != HAMMER2_PFSTYPE_SOFT_MASTER)
3030 continue;
3031
3032 if (free_nominal > hmp->voldata.allocator_free)
3033 free_nominal = hmp->voldata.allocator_free;
3034 if (free_reserved < hmp->free_reserved)
3035 free_reserved = hmp->free_reserved;
3036 }
3037
3038 /*
3039 * SMP races ok
3040 */
3041 pmp->free_reserved = free_reserved;
3042 pmp->free_nominal = free_nominal;
3043 pmp->free_ticks = ticks;
3044 } else {
3045 free_reserved = pmp->free_reserved;
3046 free_nominal = pmp->free_nominal;
3047 }
3048 if (cred && cred->cr_uid != 0) {
3049 if ((int64_t)(free_nominal - bytes) <
3050 (int64_t)free_reserved) {
3051 return 2;
3052 }
3053 } else {
3054 if ((int64_t)(free_nominal - bytes) <
3055 (int64_t)free_reserved / 2) {
3056 return 2;
3057 }
3058 }
3059 if ((int64_t)(free_nominal - bytes) < (int64_t)free_reserved * 2)
3060 return 1;
3061 return 0;
3062 }
DragonFly BSD