2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/vnode.h>
41 #include <sys/mount.h>
42 #include <sys/malloc.h>
43 #include <sys/nlookup.h>
44 #include <sys/fcntl.h>
45 #include <sys/sysctl.h>
51 * NOTE! Global statistics may not be MPSAFE so HAMMER never uses them
54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
56 int hammer_debug_general;
57 int hammer_debug_debug = 1; /* medium-error panics */
58 int hammer_debug_inode;
59 int hammer_debug_locks;
60 int hammer_debug_btree;
62 int hammer_debug_recover; /* -1 will disable, +1 will force */
63 int hammer_debug_recover_faults;
64 int hammer_debug_critical; /* non-zero enter debugger on error */
65 int hammer_cluster_enable = 1; /* enable read clustering by default */
66 int hammer_count_fsyncs;
67 int hammer_count_inodes;
68 int hammer_count_iqueued;
69 int hammer_count_reclaiming;
70 int hammer_count_records;
71 int hammer_count_record_datas;
72 int hammer_count_volumes;
73 int hammer_count_buffers;
74 int hammer_count_nodes;
75 int64_t hammer_count_extra_space_used;
76 int64_t hammer_stats_btree_lookups;
77 int64_t hammer_stats_btree_searches;
78 int64_t hammer_stats_btree_inserts;
79 int64_t hammer_stats_btree_deletes;
80 int64_t hammer_stats_btree_elements;
81 int64_t hammer_stats_btree_splits;
82 int64_t hammer_stats_btree_iterations;
83 int64_t hammer_stats_btree_root_iterations;
84 int64_t hammer_stats_record_iterations;
86 int64_t hammer_stats_file_read;
87 int64_t hammer_stats_file_write;
88 int64_t hammer_stats_file_iopsr;
89 int64_t hammer_stats_file_iopsw;
90 int64_t hammer_stats_disk_read;
91 int64_t hammer_stats_disk_write;
92 int64_t hammer_stats_inode_flushes;
93 int64_t hammer_stats_commits;
94 int64_t hammer_stats_undo;
95 int64_t hammer_stats_redo;
97 int hammer_count_dirtybufspace; /* global */
98 int hammer_count_refedbufs; /* global */
99 int hammer_count_reservations;
100 int hammer_count_io_running_read;
101 int hammer_count_io_running_write;
102 int hammer_count_io_locked;
103 int hammer_limit_dirtybufspace; /* per-mount */
104 int hammer_limit_recs; /* as a whole XXX */
105 int hammer_limit_inode_recs = 1024; /* per inode */
106 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
107 int hammer_limit_redo = 4096 * 1024; /* per inode */
108 int hammer_autoflush = 2000; /* auto flush */
109 int hammer_bio_count;
110 int hammer_verify_zone;
111 int hammer_verify_data = 1;
112 int hammer_write_mode;
113 int hammer_yield_check = 16;
114 int hammer_fsync_mode;
115 int64_t hammer_contention_count;
116 int64_t hammer_zone_limit;
118 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
119 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
120 &hammer_supported_version, 0, "");
121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
122 &hammer_debug_general, 0, "");
123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
124 &hammer_debug_io, 0, "");
125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
126 &hammer_debug_debug, 0, "");
127 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
128 &hammer_debug_inode, 0, "");
129 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
130 &hammer_debug_locks, 0, "");
131 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
132 &hammer_debug_btree, 0, "");
133 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
134 &hammer_debug_tid, 0, "");
135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
136 &hammer_debug_recover, 0, "");
137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
138 &hammer_debug_recover_faults, 0, "");
139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
140 &hammer_debug_critical, 0, "");
141 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
142 &hammer_cluster_enable, 0, "");
144 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
145 &hammer_limit_dirtybufspace, 0, "");
146 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
147 &hammer_limit_recs, 0, "");
148 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
149 &hammer_limit_inode_recs, 0, "");
150 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
151 &hammer_limit_reclaim, 0, "");
152 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
153 &hammer_limit_redo, 0, "");
155 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
156 &hammer_count_fsyncs, 0, "");
157 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
158 &hammer_count_inodes, 0, "");
159 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
160 &hammer_count_iqueued, 0, "");
161 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
162 &hammer_count_reclaiming, 0, "");
163 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
164 &hammer_count_records, 0, "");
165 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
166 &hammer_count_record_datas, 0, "");
167 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
168 &hammer_count_volumes, 0, "");
169 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
170 &hammer_count_buffers, 0, "");
171 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
172 &hammer_count_nodes, 0, "");
173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
174 &hammer_count_extra_space_used, 0, "");
176 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
177 &hammer_stats_btree_searches, 0, "");
178 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
179 &hammer_stats_btree_lookups, 0, "");
180 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
181 &hammer_stats_btree_inserts, 0, "");
182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
183 &hammer_stats_btree_deletes, 0, "");
184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
185 &hammer_stats_btree_elements, 0, "");
186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
187 &hammer_stats_btree_splits, 0, "");
188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
189 &hammer_stats_btree_iterations, 0, "");
190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
191 &hammer_stats_btree_root_iterations, 0, "");
192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
193 &hammer_stats_record_iterations, 0, "");
195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
196 &hammer_stats_file_read, 0, "");
197 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
198 &hammer_stats_file_write, 0, "");
199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
200 &hammer_stats_file_iopsr, 0, "");
201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
202 &hammer_stats_file_iopsw, 0, "");
203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
204 &hammer_stats_disk_read, 0, "");
205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
206 &hammer_stats_disk_write, 0, "");
207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
208 &hammer_stats_inode_flushes, 0, "");
209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
210 &hammer_stats_commits, 0, "");
211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
212 &hammer_stats_undo, 0, "");
213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
214 &hammer_stats_redo, 0, "");
216 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
217 &hammer_count_dirtybufspace, 0, "");
218 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
219 &hammer_count_refedbufs, 0, "");
220 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
221 &hammer_count_reservations, 0, "");
222 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
223 &hammer_count_io_running_read, 0, "");
224 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
225 &hammer_count_io_locked, 0, "");
226 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
227 &hammer_count_io_running_write, 0, "");
228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
229 &hammer_zone_limit, 0, "");
230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
231 &hammer_contention_count, 0, "");
232 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
233 &hammer_autoflush, 0, "");
234 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
235 &hammer_verify_zone, 0, "");
236 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
237 &hammer_verify_data, 0, "");
238 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
239 &hammer_write_mode, 0, "");
240 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
241 &hammer_yield_check, 0, "");
242 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
243 &hammer_fsync_mode, 0, "");
245 KTR_INFO_MASTER(hammer);
250 static void hammer_free_hmp(struct mount *mp);
252 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
254 static int hammer_vfs_unmount(struct mount *mp, int mntflags);
255 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp);
256 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
258 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
260 static int hammer_vfs_sync(struct mount *mp, int waitfor);
261 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
262 ino_t ino, struct vnode **vpp);
263 static int hammer_vfs_init(struct vfsconf *conf);
264 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
265 struct fid *fhp, struct vnode **vpp);
266 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
267 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
268 int *exflagsp, struct ucred **credanonp);
271 static struct vfsops hammer_vfsops = {
272 .vfs_mount = hammer_vfs_mount,
273 .vfs_unmount = hammer_vfs_unmount,
274 .vfs_root = hammer_vfs_root,
275 .vfs_statfs = hammer_vfs_statfs,
276 .vfs_statvfs = hammer_vfs_statvfs,
277 .vfs_sync = hammer_vfs_sync,
278 .vfs_vget = hammer_vfs_vget,
279 .vfs_init = hammer_vfs_init,
280 .vfs_vptofh = hammer_vfs_vptofh,
281 .vfs_fhtovp = hammer_vfs_fhtovp,
282 .vfs_checkexp = hammer_vfs_checkexp
285 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
287 VFS_SET(hammer_vfsops, hammer, 0);
288 MODULE_VERSION(hammer, 1);
291 hammer_vfs_init(struct vfsconf *conf)
295 if (hammer_limit_recs == 0) {
296 hammer_limit_recs = nbuf * 25;
297 n = kmalloc_limit(M_HAMMER) / 512;
298 if (hammer_limit_recs > n)
299 hammer_limit_recs = n;
301 if (hammer_limit_dirtybufspace == 0) {
302 hammer_limit_dirtybufspace = hidirtybufspace / 2;
303 if (hammer_limit_dirtybufspace < 100)
304 hammer_limit_dirtybufspace = 100;
310 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
313 struct hammer_mount_info info;
315 hammer_volume_t rootvol;
316 struct vnode *rootvp;
317 struct vnode *devvp = NULL;
318 const char *upath; /* volume name in userspace */
319 char *path; /* volume name in system space */
324 char *next_volume_ptr = NULL;
327 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot.
330 bzero(&info, sizeof(info));
335 next_volume_ptr = mp->mnt_stat.f_mntfromname;
337 /* Count number of volumes separated by ':' */
338 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
344 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
346 if ((error = copyin(data, &info, sizeof(info))) != 0)
351 * updating or new mount
353 if (mp->mnt_flag & MNT_UPDATE) {
354 hmp = (void *)mp->mnt_data;
355 KKASSERT(hmp != NULL);
357 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
363 * master-id validation. The master id may not be changed by a
366 if (info.hflags & HMNT_MASTERID) {
367 if (hmp && hmp->master_id != info.master_id) {
368 kprintf("hammer: cannot change master id "
369 "with mount update\n");
372 master_id = info.master_id;
373 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
377 master_id = hmp->master_id;
383 * Interal mount data structure
386 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
387 mp->mnt_data = (qaddr_t)hmp;
389 /*TAILQ_INIT(&hmp->recycle_list);*/
392 * Make sure kmalloc type limits are set appropriately. If root
393 * increases the vnode limit you may have to do a dummy remount
394 * to adjust the HAMMER inode limit.
396 kmalloc_create(&hmp->m_misc, "HAMMER-others");
397 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
399 maxinodes = desiredvnodes + desiredvnodes / 5 +
400 hammer_limit_reclaim * 2;
401 kmalloc_raise_limit(hmp->m_inodes,
402 maxinodes * sizeof(struct hammer_inode));
404 hmp->root_btree_beg.localization = 0x00000000U;
405 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
406 hmp->root_btree_beg.key = -0x8000000000000000LL;
407 hmp->root_btree_beg.create_tid = 1;
408 hmp->root_btree_beg.delete_tid = 1;
409 hmp->root_btree_beg.rec_type = 0;
410 hmp->root_btree_beg.obj_type = 0;
412 hmp->root_btree_end.localization = 0xFFFFFFFFU;
413 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
414 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
415 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
416 hmp->root_btree_end.delete_tid = 0; /* special case */
417 hmp->root_btree_end.rec_type = 0xFFFFU;
418 hmp->root_btree_end.obj_type = 0;
420 hmp->krate.freq = 1; /* maximum reporting rate (hz) */
421 hmp->krate.count = -16; /* initial burst */
423 hmp->sync_lock.refs = 1;
424 hmp->free_lock.refs = 1;
425 hmp->undo_lock.refs = 1;
426 hmp->blkmap_lock.refs = 1;
427 hmp->snapshot_lock.refs = 1;
428 hmp->volume_lock.refs = 1;
430 TAILQ_INIT(&hmp->delay_list);
431 TAILQ_INIT(&hmp->flush_group_list);
432 TAILQ_INIT(&hmp->objid_cache_list);
433 TAILQ_INIT(&hmp->undo_lru_list);
434 TAILQ_INIT(&hmp->reclaim_list);
436 hmp->hflags &= ~HMNT_USERFLAGS;
437 hmp->hflags |= info.hflags & HMNT_USERFLAGS;
439 hmp->master_id = master_id;
442 mp->mnt_flag |= MNT_RDONLY;
443 hmp->asof = info.asof;
445 hmp->asof = HAMMER_MAX_TID;
448 hmp->volume_to_remove = -1;
451 * Re-open read-write if originally read-only, or vise-versa.
453 * When going from read-only to read-write execute the stage2
454 * recovery if it has not already been run.
456 if (mp->mnt_flag & MNT_UPDATE) {
458 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
459 kprintf("HAMMER read-only -> read-write\n");
461 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
462 hammer_adjust_volume_mode, NULL);
463 rootvol = hammer_get_root_volume(hmp, &error);
465 hammer_recover_flush_buffers(hmp, rootvol, 1);
466 error = hammer_recover_stage2(hmp, rootvol);
467 bcopy(rootvol->ondisk->vol0_blockmap,
469 sizeof(hmp->blockmap));
470 hammer_rel_volume(rootvol, 0);
472 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
473 hammer_reload_inode, NULL);
474 /* kernel clears MNT_RDONLY */
475 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
476 kprintf("HAMMER read-write -> read-only\n");
477 hmp->ronly = 1; /* messy */
478 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
479 hammer_reload_inode, NULL);
481 hammer_flusher_sync(hmp);
482 hammer_flusher_sync(hmp);
483 hammer_flusher_sync(hmp);
485 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
486 hammer_adjust_volume_mode, NULL);
491 RB_INIT(&hmp->rb_vols_root);
492 RB_INIT(&hmp->rb_inos_root);
493 RB_INIT(&hmp->rb_nods_root);
494 RB_INIT(&hmp->rb_undo_root);
495 RB_INIT(&hmp->rb_resv_root);
496 RB_INIT(&hmp->rb_bufs_root);
497 RB_INIT(&hmp->rb_pfsm_root);
499 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
501 TAILQ_INIT(&hmp->volu_list);
502 TAILQ_INIT(&hmp->undo_list);
503 TAILQ_INIT(&hmp->data_list);
504 TAILQ_INIT(&hmp->meta_list);
505 TAILQ_INIT(&hmp->lose_list);
510 path = objcache_get(namei_oc, M_WAITOK);
512 for (i = 0; i < info.nvolumes; ++i) {
517 KKASSERT(next_volume_ptr != NULL);
519 if (*next_volume_ptr != '/') {
521 strcpy(path, "/dev/");
524 for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
525 if (*next_volume_ptr == '\0') {
527 } else if (*next_volume_ptr == ':') {
531 path[k] = *next_volume_ptr;
538 cdev_t dev = kgetdiskbyname(path);
539 error = bdevvp(dev, &devvp);
541 kprintf("hammer_mountroot: can't find devvp\n");
544 error = copyin(&info.volumes[i], &upath,
547 error = copyinstr(upath, path,
551 error = hammer_install_volume(hmp, path, devvp);
555 objcache_put(namei_oc, path);
558 * Make sure we found a root volume
560 if (error == 0 && hmp->rootvol == NULL) {
561 kprintf("hammer_mount: No root volume found!\n");
566 * Check that all required volumes are available
568 if (error == 0 && hammer_mountcheck_volumes(hmp)) {
569 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
579 * No errors, setup enough of the mount point so we can lookup the
582 mp->mnt_iosize_max = MAXPHYS;
583 mp->mnt_kern_flag |= MNTK_FSMID;
586 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE
587 * will acquire a per-mount token prior to entry and release it
588 * on return, so even if we do not specify it we no longer get
589 * the BGL regardlless of how we are flagged.
591 mp->mnt_kern_flag |= MNTK_RD_MPSAFE | MNTK_GA_MPSAFE |
595 * note: f_iosize is used by vnode_pager_haspage() when constructing
598 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
599 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
601 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
602 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
604 mp->mnt_maxsymlinklen = 255;
605 mp->mnt_flag |= MNT_LOCAL;
607 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
608 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
609 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
612 * The root volume's ondisk pointer is only valid if we hold a
615 rootvol = hammer_get_root_volume(hmp, &error);
620 * Perform any necessary UNDO operations. The recovery code does
621 * call hammer_undo_lookup() so we have to pre-cache the blockmap,
622 * and then re-copy it again after recovery is complete.
624 * If this is a read-only mount the UNDO information is retained
625 * in memory in the form of dirty buffer cache buffers, and not
626 * written back to the media.
628 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
629 sizeof(hmp->blockmap));
632 * Check filesystem version
634 hmp->version = rootvol->ondisk->vol_version;
635 if (hmp->version < HAMMER_VOL_VERSION_MIN ||
636 hmp->version > HAMMER_VOL_VERSION_MAX) {
637 kprintf("HAMMER: mount unsupported fs version %d\n",
644 * The undo_rec_limit limits the size of flush groups to avoid
645 * blowing out the UNDO FIFO. This calculation is typically in
646 * the tens of thousands and is designed primarily when small
647 * HAMMER filesystems are created.
649 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
650 if (hammer_debug_general & 0x0001)
651 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
654 * NOTE: Recover stage1 not only handles meta-data recovery, it
655 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
657 error = hammer_recover_stage1(hmp, rootvol);
659 kprintf("Failed to recover HAMMER filesystem on mount\n");
664 * Finish setup now that we have a good root volume.
666 * The top 16 bits of fsid.val[1] is a pfs id.
668 ksnprintf(mp->mnt_stat.f_mntfromname,
669 sizeof(mp->mnt_stat.f_mntfromname), "%s",
670 rootvol->ondisk->vol_name);
671 mp->mnt_stat.f_fsid.val[0] =
672 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
673 mp->mnt_stat.f_fsid.val[1] =
674 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
675 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
677 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
678 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
679 sizeof(mp->mnt_vstat.f_fsid_uuid));
682 * Certain often-modified fields in the root volume are cached in
683 * the hammer_mount structure so we do not have to generate lots
684 * of little UNDO structures for them.
686 * Recopy after recovery. This also has the side effect of
687 * setting our cached undo FIFO's first_offset, which serves to
688 * placemark the FIFO start for the NEXT flush cycle while the
689 * on-disk first_offset represents the LAST flush cycle.
691 hmp->next_tid = rootvol->ondisk->vol0_next_tid;
692 hmp->flush_tid1 = hmp->next_tid;
693 hmp->flush_tid2 = hmp->next_tid;
694 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
695 sizeof(hmp->blockmap));
696 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
698 hammer_flusher_create(hmp);
701 * Locate the root directory using the root cluster's B-Tree as a
702 * starting point. The root directory uses an obj_id of 1.
704 * FUTURE: Leave the root directory cached referenced but unlocked
705 * in hmp->rootvp (need to flush it on unmount).
707 error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
711 /*vn_unlock(hmp->rootvp);*/
713 error = hammer_recover_stage2(hmp, rootvol);
716 hammer_rel_volume(rootvol, 0);
719 * Cleanup and return.
727 hammer_vfs_unmount(struct mount *mp, int mntflags)
730 struct hammer_mount *hmp = (void *)mp->mnt_data;
736 * Clean out the vnodes
739 if (mntflags & MNT_FORCE)
741 if ((error = vflush(mp, 0, flags)) != 0)
745 * Clean up the internal mount structure and related entities. This
753 * Clean up the internal mount structure and disassociate it from the mount.
754 * This may issue I/O.
757 hammer_free_hmp(struct mount *mp)
759 struct hammer_mount *hmp = (void *)mp->mnt_data;
760 hammer_flush_group_t flg;
765 * Flush anything dirty. This won't even run if the
766 * filesystem errored-out.
769 while (hammer_flusher_haswork(hmp)) {
770 hammer_flusher_sync(hmp);
774 kprintf("HAMMER: umount flushing.");
777 tsleep(&dummy, 0, "hmrufl", hz);
780 kprintf("giving up\n");
784 if (count >= 5 && count < 30)
788 * If the mount had a critical error we have to destroy any
789 * remaining inodes before we can finish cleaning up the flusher.
791 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
792 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
793 hammer_destroy_inode_callback, NULL);
797 * There shouldn't be any inodes left now and any left over
798 * flush groups should now be empty.
800 KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
801 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
802 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
803 KKASSERT(RB_EMPTY(&flg->flush_tree));
805 kprintf("HAMMER: Warning, flush_group %p was "
806 "not empty on umount!\n", flg);
808 kfree(flg, hmp->m_misc);
812 * We can finally destroy the flusher
814 hammer_flusher_destroy(hmp);
817 * We may have held recovered buffers due to a read-only mount.
818 * These must be discarded.
821 hammer_recover_flush_buffers(hmp, NULL, -1);
824 * Unload buffers and then volumes
826 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
827 hammer_unload_buffer, NULL);
828 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
829 hammer_unload_volume, NULL);
832 mp->mnt_flag &= ~MNT_LOCAL;
834 hammer_destroy_objid_cache(hmp);
835 kmalloc_destroy(&hmp->m_misc);
836 kmalloc_destroy(&hmp->m_inodes);
837 kfree(hmp, M_HAMMER);
841 * Report critical errors. ip may be NULL.
844 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
845 int error, const char *msg)
847 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
849 krateprintf(&hmp->krate,
850 "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
851 hmp->mp->mnt_stat.f_mntfromname,
852 (intmax_t)(ip ? ip->obj_id : -1),
855 if (hmp->ronly == 0) {
856 hmp->ronly = 2; /* special errored read-only mode */
857 hmp->mp->mnt_flag |= MNT_RDONLY;
858 kprintf("HAMMER(%s): Forcing read-only mode\n",
859 hmp->mp->mnt_stat.f_mntfromname);
862 if (hammer_debug_critical)
863 Debugger("Entering debugger");
868 * Obtain a vnode for the specified inode number. An exclusively locked
872 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
873 ino_t ino, struct vnode **vpp)
875 struct hammer_transaction trans;
876 struct hammer_mount *hmp = (void *)mp->mnt_data;
877 struct hammer_inode *ip;
879 u_int32_t localization;
881 hammer_simple_transaction(&trans, hmp);
884 * If a directory vnode is supplied (mainly NFS) then we can acquire
885 * the PFS domain from it. Otherwise we would only be able to vget
886 * inodes in the root PFS.
889 localization = HAMMER_DEF_LOCALIZATION +
890 VTOI(dvp)->obj_localization;
892 localization = HAMMER_DEF_LOCALIZATION;
896 * Lookup the requested HAMMER inode. The structure must be
897 * left unlocked while we manipulate the related vnode to avoid
900 ip = hammer_get_inode(&trans, NULL, ino,
901 hmp->asof, localization,
905 hammer_done_transaction(&trans);
908 error = hammer_get_vnode(ip, vpp);
909 hammer_rel_inode(ip, 0);
910 hammer_done_transaction(&trans);
915 * Return the root vnode for the filesystem.
917 * HAMMER stores the root vnode in the hammer_mount structure so
918 * getting it is easy.
921 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
924 struct hammer_mount *hmp = (void *)mp->mnt_data;
928 error = hammer_vfs_vget(mp, NULL, 1, vpp);
933 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
935 struct hammer_mount *hmp = (void *)mp->mnt_data;
936 hammer_volume_t volume;
937 hammer_volume_ondisk_t ondisk;
942 volume = hammer_get_root_volume(hmp, &error);
945 ondisk = volume->ondisk;
950 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
951 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
952 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
953 hammer_rel_volume(volume, 0);
955 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
956 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
957 if (mp->mnt_stat.f_files < 0)
958 mp->mnt_stat.f_files = 0;
965 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
967 struct hammer_mount *hmp = (void *)mp->mnt_data;
968 hammer_volume_t volume;
969 hammer_volume_ondisk_t ondisk;
974 volume = hammer_get_root_volume(hmp, &error);
977 ondisk = volume->ondisk;
982 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
983 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
984 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
985 hammer_rel_volume(volume, 0);
987 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
988 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
989 if (mp->mnt_vstat.f_files < 0)
990 mp->mnt_vstat.f_files = 0;
991 *sbp = mp->mnt_vstat;
996 * Sync the filesystem. Currently we have to run it twice, the second
997 * one will advance the undo start index to the end index, so if a crash
998 * occurs no undos will be run on mount.
1000 * We do not sync the filesystem if we are called from a panic. If we did
1001 * we might end up blowing up a sync that was already in progress.
1004 hammer_vfs_sync(struct mount *mp, int waitfor)
1006 struct hammer_mount *hmp = (void *)mp->mnt_data;
1009 if (panicstr == NULL) {
1010 error = hammer_sync_hmp(hmp, waitfor);
1018 * Convert a vnode to a file handle.
1021 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1025 KKASSERT(MAXFIDSZ >= 16);
1027 fhp->fid_len = offsetof(struct fid, fid_data[16]);
1028 fhp->fid_ext = ip->obj_localization >> 16;
1029 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1030 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1036 * Convert a file handle back to a vnode.
1038 * Use rootvp to enforce PFS isolation when a PFS is exported via a
1042 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1043 struct fid *fhp, struct vnode **vpp)
1045 struct hammer_transaction trans;
1046 struct hammer_inode *ip;
1047 struct hammer_inode_info info;
1049 u_int32_t localization;
1051 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1052 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1054 localization = VTOI(rootvp)->obj_localization;
1056 localization = (u_int32_t)fhp->fid_ext << 16;
1058 hammer_simple_transaction(&trans, (void *)mp->mnt_data);
1061 * Get/allocate the hammer_inode structure. The structure must be
1062 * unlocked while we manipulate the related vnode to avoid a
1065 ip = hammer_get_inode(&trans, NULL, info.obj_id,
1066 info.obj_asof, localization, 0, &error);
1068 error = hammer_get_vnode(ip, vpp);
1069 hammer_rel_inode(ip, 0);
1073 hammer_done_transaction(&trans);
1078 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1079 int *exflagsp, struct ucred **credanonp)
1081 hammer_mount_t hmp = (void *)mp->mnt_data;
1085 np = vfs_export_lookup(mp, &hmp->export, nam);
1087 *exflagsp = np->netc_exflags;
1088 *credanonp = &np->netc_anon;
1098 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1100 hammer_mount_t hmp = (void *)mp->mnt_data;
1104 case MOUNTCTL_SET_EXPORT:
1105 error = vfs_export(mp, &hmp->export, export);