66f6c8d05a9163b9de3def72d29b8908b1eb338a
[dragonfly.git] / sys / vfs / hammer / hammer_vfsops.c
1 /*
2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
3  * 
4  * This code is derived from software contributed to The DragonFly Project
5  * by Matthew Dillon <dillon@backplane.com>
6  * 
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 
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
16  *    distribution.
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.
20  * 
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
32  * SUCH DAMAGE.
33  * 
34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
35  */
36
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>
46 #include <sys/buf.h>
47 #include <sys/buf2.h>
48 #include "hammer.h"
49
50 /*
51  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
52  *        in conditionals.
53  */
54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
55 int hammer_debug_io;
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;
61 int hammer_debug_tid;
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_live_dedup = 0;
67 int hammer_count_fsyncs;
68 int hammer_count_inodes;
69 int hammer_count_iqueued;
70 int hammer_count_reclaiming;
71 int hammer_count_records;
72 int hammer_count_record_datas;
73 int hammer_count_volumes;
74 int hammer_count_buffers;
75 int hammer_count_nodes;
76 int64_t hammer_count_extra_space_used;
77 int64_t hammer_stats_btree_lookups;
78 int64_t hammer_stats_btree_searches;
79 int64_t hammer_stats_btree_inserts;
80 int64_t hammer_stats_btree_deletes;
81 int64_t hammer_stats_btree_elements;
82 int64_t hammer_stats_btree_splits;
83 int64_t hammer_stats_btree_iterations;
84 int64_t hammer_stats_btree_root_iterations;
85 int64_t hammer_stats_record_iterations;
86
87 int64_t hammer_stats_file_read;
88 int64_t hammer_stats_file_write;
89 int64_t hammer_stats_file_iopsr;
90 int64_t hammer_stats_file_iopsw;
91 int64_t hammer_stats_disk_read;
92 int64_t hammer_stats_disk_write;
93 int64_t hammer_stats_inode_flushes;
94 int64_t hammer_stats_commits;
95 int64_t hammer_stats_undo;
96 int64_t hammer_stats_redo;
97
98 int hammer_count_dirtybufspace;         /* global */
99 int hammer_count_refedbufs;             /* global */
100 int hammer_count_reservations;
101 int hammer_count_io_running_read;
102 int hammer_count_io_running_write;
103 int hammer_count_io_locked;
104 int hammer_limit_dirtybufspace;         /* per-mount */
105 int hammer_limit_running_io;            /* per-mount */
106 int hammer_limit_recs;                  /* as a whole XXX */
107 int hammer_limit_inode_recs = 1024;     /* per inode */
108 int hammer_limit_reclaim = HAMMER_RECLAIM_WAIT;
109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
110 int hammer_limit_redo = 4096 * 1024;    /* per inode */
111 int hammer_autoflush = 2000;            /* auto flush */
112 int hammer_bio_count;
113 int hammer_verify_zone;
114 int hammer_verify_data = 1;
115 int hammer_write_mode;
116 int hammer_yield_check = 16;
117 int hammer_fsync_mode = 3;
118 int64_t hammer_contention_count;
119 int64_t hammer_zone_limit;
120
121 /*
122  * Live dedup debug counters (sysctls are writable so that counters
123  * can be reset from userspace).
124  */
125 int64_t hammer_live_dedup_vnode_bcmps = 0;
126 int64_t hammer_live_dedup_device_bcmps = 0;
127 int64_t hammer_live_dedup_findblk_failures = 0;
128 int64_t hammer_live_dedup_bmap_saves = 0;
129
130
131 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
132
133 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
134            &hammer_supported_version, 0, "");
135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
136            &hammer_debug_general, 0, "");
137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
138            &hammer_debug_io, 0, "");
139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
140            &hammer_debug_debug, 0, "");
141 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
142            &hammer_debug_inode, 0, "");
143 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
144            &hammer_debug_locks, 0, "");
145 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
146            &hammer_debug_btree, 0, "");
147 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
148            &hammer_debug_tid, 0, "");
149 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
150            &hammer_debug_recover, 0, "");
151 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
152            &hammer_debug_recover_faults, 0, "");
153 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
154            &hammer_debug_critical, 0, "");
155 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
156            &hammer_cluster_enable, 0, "");
157 /*
158  * 0 - live dedup is disabled
159  * 1 - dedup cache is populated on reads only
160  * 2 - dedup cache is populated on both reads and writes
161  */
162 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
163            &hammer_live_dedup, 0, "Enable live dedup");
164
165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
166            &hammer_limit_dirtybufspace, 0, "");
167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
168            &hammer_limit_running_io, 0, "");
169 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
170            &hammer_limit_recs, 0, "");
171 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
172            &hammer_limit_inode_recs, 0, "");
173 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
174            &hammer_limit_reclaim, 0, "");
175 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
176            &hammer_live_dedup_cache_size, 0, "");
177 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
178            &hammer_limit_redo, 0, "");
179
180 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
181            &hammer_count_fsyncs, 0, "");
182 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
183            &hammer_count_inodes, 0, "");
184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
185            &hammer_count_iqueued, 0, "");
186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
187            &hammer_count_reclaiming, 0, "");
188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
189            &hammer_count_records, 0, "");
190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
191            &hammer_count_record_datas, 0, "");
192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
193            &hammer_count_volumes, 0, "");
194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
195            &hammer_count_buffers, 0, "");
196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
197            &hammer_count_nodes, 0, "");
198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
199            &hammer_count_extra_space_used, 0, "");
200
201 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
202            &hammer_stats_btree_searches, 0, "");
203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
204            &hammer_stats_btree_lookups, 0, "");
205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
206            &hammer_stats_btree_inserts, 0, "");
207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
208            &hammer_stats_btree_deletes, 0, "");
209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
210            &hammer_stats_btree_elements, 0, "");
211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
212            &hammer_stats_btree_splits, 0, "");
213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
214            &hammer_stats_btree_iterations, 0, "");
215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
216            &hammer_stats_btree_root_iterations, 0, "");
217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
218            &hammer_stats_record_iterations, 0, "");
219
220 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
221            &hammer_stats_file_read, 0, "");
222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
223            &hammer_stats_file_write, 0, "");
224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
225            &hammer_stats_file_iopsr, 0, "");
226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
227            &hammer_stats_file_iopsw, 0, "");
228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
229            &hammer_stats_disk_read, 0, "");
230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
231            &hammer_stats_disk_write, 0, "");
232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
233            &hammer_stats_inode_flushes, 0, "");
234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
235            &hammer_stats_commits, 0, "");
236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
237            &hammer_stats_undo, 0, "");
238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
239            &hammer_stats_redo, 0, "");
240
241 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
242             &hammer_live_dedup_vnode_bcmps, 0,
243             "successful vnode buffer comparisons");
244 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
245             &hammer_live_dedup_device_bcmps, 0,
246             "successful device buffer comparisons");
247 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
248             &hammer_live_dedup_findblk_failures, 0,
249             "block lookup failures for comparison");
250 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
251             &hammer_live_dedup_bmap_saves, 0,
252             "useful physical block lookups");
253
254 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
255            &hammer_count_dirtybufspace, 0, "");
256 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
257            &hammer_count_refedbufs, 0, "");
258 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
259            &hammer_count_reservations, 0, "");
260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
261            &hammer_count_io_running_read, 0, "");
262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
263            &hammer_count_io_locked, 0, "");
264 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
265            &hammer_count_io_running_write, 0, "");
266 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
267            &hammer_zone_limit, 0, "");
268 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
269            &hammer_contention_count, 0, "");
270 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
271            &hammer_autoflush, 0, "");
272 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
273            &hammer_verify_zone, 0, "");
274 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
275            &hammer_verify_data, 0, "");
276 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
277            &hammer_write_mode, 0, "");
278 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
279            &hammer_yield_check, 0, "");
280 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
281            &hammer_fsync_mode, 0, "");
282
283 KTR_INFO_MASTER(hammer);
284
285 /*
286  * VFS ABI
287  */
288 static void     hammer_free_hmp(struct mount *mp);
289
290 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
291                                 struct ucred *cred);
292 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
293 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
294 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
295                                 struct ucred *cred);
296 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
297                                 struct ucred *cred);
298 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
299 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
300                                 ino_t ino, struct vnode **vpp);
301 static int      hammer_vfs_init(struct vfsconf *conf);
302 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
303                                 struct fid *fhp, struct vnode **vpp);
304 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
305 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
306                                 int *exflagsp, struct ucred **credanonp);
307
308
309 static struct vfsops hammer_vfsops = {
310         .vfs_mount      = hammer_vfs_mount,
311         .vfs_unmount    = hammer_vfs_unmount,
312         .vfs_root       = hammer_vfs_root,
313         .vfs_statfs     = hammer_vfs_statfs,
314         .vfs_statvfs    = hammer_vfs_statvfs,
315         .vfs_sync       = hammer_vfs_sync,
316         .vfs_vget       = hammer_vfs_vget,
317         .vfs_init       = hammer_vfs_init,
318         .vfs_vptofh     = hammer_vfs_vptofh,
319         .vfs_fhtovp     = hammer_vfs_fhtovp,
320         .vfs_checkexp   = hammer_vfs_checkexp
321 };
322
323 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
324
325 VFS_SET(hammer_vfsops, hammer, 0);
326 MODULE_VERSION(hammer, 1);
327
328 static int
329 hammer_vfs_init(struct vfsconf *conf)
330 {
331         int n;
332
333         if (hammer_limit_recs == 0) {
334                 hammer_limit_recs = nbuf * 25;
335                 n = kmalloc_limit(M_HAMMER) / 512;
336                 if (hammer_limit_recs > n)
337                         hammer_limit_recs = n;
338         }
339         if (hammer_limit_dirtybufspace == 0) {
340                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
341                 if (hammer_limit_dirtybufspace < 100)
342                         hammer_limit_dirtybufspace = 100;
343         }
344
345         /*
346          * Set reasonable limits to maintain an I/O pipeline.  This is
347          * used by the flush code which explicitly initiates I/O, and
348          * is per-mount.
349          *
350          * The system-driven buffer cache uses vfs.lorunningspace and
351          * vfs.hirunningspace globally.
352          */
353         if (hammer_limit_running_io == 0)
354                 hammer_limit_running_io = hammer_limit_dirtybufspace;
355         if (hammer_limit_running_io > 10 * 1024 * 1024)
356                 hammer_limit_running_io = 10 * 1024 * 1024;
357         return(0);
358 }
359
360 static int
361 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
362                  struct ucred *cred)
363 {
364         struct hammer_mount_info info;
365         hammer_mount_t hmp;
366         hammer_volume_t rootvol;
367         struct vnode *rootvp;
368         struct vnode *devvp = NULL;
369         const char *upath;      /* volume name in userspace */
370         char *path;             /* volume name in system space */
371         int error;
372         int i;
373         int master_id;
374         char *next_volume_ptr = NULL;
375
376         /*
377          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
378          */
379         if (mntpt == NULL) {
380                 bzero(&info, sizeof(info));
381                 info.asof = 0;
382                 info.hflags = 0;
383                 info.nvolumes = 1;
384
385                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
386
387                 /* Count number of volumes separated by ':' */
388                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
389                         if (*p == ':') {
390                                 ++info.nvolumes;
391                         }
392                 }
393
394                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
395         } else {
396                 if ((error = copyin(data, &info, sizeof(info))) != 0)
397                         return (error);
398         }
399
400         /*
401          * updating or new mount
402          */
403         if (mp->mnt_flag & MNT_UPDATE) {
404                 hmp = (void *)mp->mnt_data;
405                 KKASSERT(hmp != NULL);
406         } else {
407                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
408                         return (EINVAL);
409                 hmp = NULL;
410         }
411
412         /*
413          * master-id validation.  The master id may not be changed by a
414          * mount update.
415          */
416         if (info.hflags & HMNT_MASTERID) {
417                 if (hmp && hmp->master_id != info.master_id) {
418                         kprintf("hammer: cannot change master id "
419                                 "with mount update\n");
420                         return(EINVAL);
421                 }
422                 master_id = info.master_id;
423                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
424                         return (EINVAL);
425         } else {
426                 if (hmp)
427                         master_id = hmp->master_id;
428                 else
429                         master_id = 0;
430         }
431
432         /*
433          * Internal mount data structure
434          */
435         if (hmp == NULL) {
436                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
437                 mp->mnt_data = (qaddr_t)hmp;
438                 hmp->mp = mp;
439                 /*TAILQ_INIT(&hmp->recycle_list);*/
440
441                 /*
442                  * Make sure kmalloc type limits are set appropriately.
443                  *
444                  * Our inode kmalloc group is sized based on maxvnodes
445                  * (controlled by the system, not us).
446                  */
447                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
448                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
449
450                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
451
452                 hmp->root_btree_beg.localization = 0x00000000U;
453                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
454                 hmp->root_btree_beg.key = -0x8000000000000000LL;
455                 hmp->root_btree_beg.create_tid = 1;
456                 hmp->root_btree_beg.delete_tid = 1;
457                 hmp->root_btree_beg.rec_type = 0;
458                 hmp->root_btree_beg.obj_type = 0;
459
460                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
461                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
462                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
463                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
464                 hmp->root_btree_end.delete_tid = 0;   /* special case */
465                 hmp->root_btree_end.rec_type = 0xFFFFU;
466                 hmp->root_btree_end.obj_type = 0;
467
468                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
469                 hmp->krate.count = -16; /* initial burst */
470
471                 hmp->sync_lock.refs = 1;
472                 hmp->free_lock.refs = 1;
473                 hmp->undo_lock.refs = 1;
474                 hmp->blkmap_lock.refs = 1;
475                 hmp->snapshot_lock.refs = 1;
476                 hmp->volume_lock.refs = 1;
477
478                 TAILQ_INIT(&hmp->delay_list);
479                 TAILQ_INIT(&hmp->flush_group_list);
480                 TAILQ_INIT(&hmp->objid_cache_list);
481                 TAILQ_INIT(&hmp->undo_lru_list);
482                 TAILQ_INIT(&hmp->reclaim_list);
483
484                 RB_INIT(&hmp->rb_dedup_crc_root);
485                 RB_INIT(&hmp->rb_dedup_off_root);       
486                 TAILQ_INIT(&hmp->dedup_lru_list);
487         }
488         hmp->hflags &= ~HMNT_USERFLAGS;
489         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
490
491         hmp->master_id = master_id;
492
493         if (info.asof) {
494                 mp->mnt_flag |= MNT_RDONLY;
495                 hmp->asof = info.asof;
496         } else {
497                 hmp->asof = HAMMER_MAX_TID;
498         }
499
500         hmp->volume_to_remove = -1;
501
502         /*
503          * Re-open read-write if originally read-only, or vise-versa.
504          *
505          * When going from read-only to read-write execute the stage2
506          * recovery if it has not already been run.
507          */
508         if (mp->mnt_flag & MNT_UPDATE) {
509                 lwkt_gettoken(&hmp->fs_token);
510                 error = 0;
511                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
512                         kprintf("HAMMER read-only -> read-write\n");
513                         hmp->ronly = 0;
514                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
515                                 hammer_adjust_volume_mode, NULL);
516                         rootvol = hammer_get_root_volume(hmp, &error);
517                         if (rootvol) {
518                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
519                                 error = hammer_recover_stage2(hmp, rootvol);
520                                 bcopy(rootvol->ondisk->vol0_blockmap,
521                                       hmp->blockmap,
522                                       sizeof(hmp->blockmap));
523                                 hammer_rel_volume(rootvol, 0);
524                         }
525                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
526                                 hammer_reload_inode, NULL);
527                         /* kernel clears MNT_RDONLY */
528                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
529                         kprintf("HAMMER read-write -> read-only\n");
530                         hmp->ronly = 1; /* messy */
531                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
532                                 hammer_reload_inode, NULL);
533                         hmp->ronly = 0;
534                         hammer_flusher_sync(hmp);
535                         hammer_flusher_sync(hmp);
536                         hammer_flusher_sync(hmp);
537                         hmp->ronly = 1;
538                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
539                                 hammer_adjust_volume_mode, NULL);
540                 }
541                 lwkt_reltoken(&hmp->fs_token);
542                 return(error);
543         }
544
545         RB_INIT(&hmp->rb_vols_root);
546         RB_INIT(&hmp->rb_inos_root);
547         RB_INIT(&hmp->rb_redo_root);
548         RB_INIT(&hmp->rb_nods_root);
549         RB_INIT(&hmp->rb_undo_root);
550         RB_INIT(&hmp->rb_resv_root);
551         RB_INIT(&hmp->rb_bufs_root);
552         RB_INIT(&hmp->rb_pfsm_root);
553
554         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
555
556         TAILQ_INIT(&hmp->volu_list);
557         TAILQ_INIT(&hmp->undo_list);
558         TAILQ_INIT(&hmp->data_list);
559         TAILQ_INIT(&hmp->meta_list);
560         TAILQ_INIT(&hmp->lose_list);
561         TAILQ_INIT(&hmp->iorun_list);
562
563         lwkt_token_init(&hmp->fs_token, 1, "hammerfs");
564         lwkt_token_init(&hmp->io_token, 1, "hammerio");
565
566         lwkt_gettoken(&hmp->fs_token);
567
568         /*
569          * Load volumes
570          */
571         path = objcache_get(namei_oc, M_WAITOK);
572         hmp->nvolumes = -1;
573         for (i = 0; i < info.nvolumes; ++i) {
574                 if (mntpt == NULL) {
575                         /*
576                          * Root mount.
577                          */
578                         KKASSERT(next_volume_ptr != NULL);
579                         strcpy(path, "");
580                         if (*next_volume_ptr != '/') {
581                                 /* relative path */
582                                 strcpy(path, "/dev/");
583                         }
584                         int k;
585                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
586                                 if (*next_volume_ptr == '\0') {
587                                         break;
588                                 } else if (*next_volume_ptr == ':') {
589                                         ++next_volume_ptr;
590                                         break;
591                                 } else {
592                                         path[k] = *next_volume_ptr;
593                                         ++next_volume_ptr;
594                                 }
595                         }
596                         path[k] = '\0';
597
598                         error = 0;
599                         cdev_t dev = kgetdiskbyname(path);
600                         error = bdevvp(dev, &devvp);
601                         if (error) {
602                                 kprintf("hammer_mountroot: can't find devvp\n");
603                         }
604                 } else {
605                         error = copyin(&info.volumes[i], &upath,
606                                        sizeof(char *));
607                         if (error == 0)
608                                 error = copyinstr(upath, path,
609                                                   MAXPATHLEN, NULL);
610                 }
611                 if (error == 0)
612                         error = hammer_install_volume(hmp, path, devvp);
613                 if (error)
614                         break;
615         }
616         objcache_put(namei_oc, path);
617
618         /*
619          * Make sure we found a root volume
620          */
621         if (error == 0 && hmp->rootvol == NULL) {
622                 kprintf("hammer_mount: No root volume found!\n");
623                 error = EINVAL;
624         }
625
626         /*
627          * Check that all required volumes are available
628          */
629         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
630                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
631                 error = EINVAL;
632         }
633
634         if (error) {
635                 /* called with fs_token held */
636                 hammer_free_hmp(mp);
637                 return (error);
638         }
639
640         /*
641          * No errors, setup enough of the mount point so we can lookup the
642          * root vnode.
643          */
644         mp->mnt_iosize_max = MAXPHYS;
645         mp->mnt_kern_flag |= MNTK_FSMID;
646
647         /*
648          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
649          * will acquire a per-mount token prior to entry and release it
650          * on return, so even if we do not specify it we no longer get
651          * the BGL regardlless of how we are flagged.
652          */
653         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
654         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
655
656         /* 
657          * note: f_iosize is used by vnode_pager_haspage() when constructing
658          * its VOP_BMAP call.
659          */
660         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
661         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
662
663         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
664         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
665
666         mp->mnt_maxsymlinklen = 255;
667         mp->mnt_flag |= MNT_LOCAL;
668
669         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
670         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
671         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
672
673         /*
674          * The root volume's ondisk pointer is only valid if we hold a
675          * reference to it.
676          */
677         rootvol = hammer_get_root_volume(hmp, &error);
678         if (error)
679                 goto failed;
680
681         /*
682          * Perform any necessary UNDO operations.  The recovery code does
683          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
684          * and then re-copy it again after recovery is complete.
685          *
686          * If this is a read-only mount the UNDO information is retained
687          * in memory in the form of dirty buffer cache buffers, and not
688          * written back to the media.
689          */
690         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
691               sizeof(hmp->blockmap));
692
693         /*
694          * Check filesystem version
695          */
696         hmp->version = rootvol->ondisk->vol_version;
697         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
698             hmp->version > HAMMER_VOL_VERSION_MAX) {
699                 kprintf("HAMMER: mount unsupported fs version %d\n",
700                         hmp->version);
701                 error = ERANGE;
702                 goto done;
703         }
704
705         /*
706          * The undo_rec_limit limits the size of flush groups to avoid
707          * blowing out the UNDO FIFO.  This calculation is typically in
708          * the tens of thousands and is designed primarily when small
709          * HAMMER filesystems are created.
710          */
711         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
712         if (hammer_debug_general & 0x0001)
713                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
714
715         /*
716          * NOTE: Recover stage1 not only handles meta-data recovery, it
717          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
718          */
719         error = hammer_recover_stage1(hmp, rootvol);
720         if (error) {
721                 kprintf("Failed to recover HAMMER filesystem on mount\n");
722                 goto done;
723         }
724
725         /*
726          * Finish setup now that we have a good root volume.
727          *
728          * The top 16 bits of fsid.val[1] is a pfs id.
729          */
730         ksnprintf(mp->mnt_stat.f_mntfromname,
731                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
732                   rootvol->ondisk->vol_name);
733         mp->mnt_stat.f_fsid.val[0] =
734                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
735         mp->mnt_stat.f_fsid.val[1] =
736                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
737         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
738
739         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
740         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
741                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
742
743         /*
744          * Certain often-modified fields in the root volume are cached in
745          * the hammer_mount structure so we do not have to generate lots
746          * of little UNDO structures for them.
747          *
748          * Recopy after recovery.  This also has the side effect of
749          * setting our cached undo FIFO's first_offset, which serves to
750          * placemark the FIFO start for the NEXT flush cycle while the
751          * on-disk first_offset represents the LAST flush cycle.
752          */
753         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
754         hmp->flush_tid1 = hmp->next_tid;
755         hmp->flush_tid2 = hmp->next_tid;
756         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
757               sizeof(hmp->blockmap));
758         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
759
760         hammer_flusher_create(hmp);
761
762         /*
763          * Locate the root directory using the root cluster's B-Tree as a
764          * starting point.  The root directory uses an obj_id of 1.
765          *
766          * FUTURE: Leave the root directory cached referenced but unlocked
767          * in hmp->rootvp (need to flush it on unmount).
768          */
769         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
770         if (error)
771                 goto done;
772         vput(rootvp);
773         /*vn_unlock(hmp->rootvp);*/
774         if (hmp->ronly == 0)
775                 error = hammer_recover_stage2(hmp, rootvol);
776
777         /*
778          * If the stage2 recovery fails be sure to clean out all cached
779          * vnodes before throwing away the mount structure or bad things
780          * will happen.
781          */
782         if (error)
783                 vflush(mp, 0, 0);
784
785 done:
786         hammer_rel_volume(rootvol, 0);
787 failed:
788         /*
789          * Cleanup and return.
790          */
791         if (error) {
792                 /* called with fs_token held */
793                 hammer_free_hmp(mp);
794         } else {
795                 lwkt_reltoken(&hmp->fs_token);
796         }
797         return (error);
798 }
799
800 static int
801 hammer_vfs_unmount(struct mount *mp, int mntflags)
802 {
803         hammer_mount_t hmp = (void *)mp->mnt_data;
804         int flags;
805         int error;
806
807         /*
808          * Clean out the vnodes
809          */
810         lwkt_gettoken(&hmp->fs_token);
811         flags = 0;
812         if (mntflags & MNT_FORCE)
813                 flags |= FORCECLOSE;
814         error = vflush(mp, 0, flags);
815
816         /*
817          * Clean up the internal mount structure and related entities.  This
818          * may issue I/O.
819          */
820         if (error == 0) {
821                 /* called with fs_token held */
822                 hammer_free_hmp(mp);
823         } else {
824                 lwkt_reltoken(&hmp->fs_token);
825         }
826         return(error);
827 }
828
829 /*
830  * Clean up the internal mount structure and disassociate it from the mount.
831  * This may issue I/O.
832  *
833  * Called with fs_token held.
834  */
835 static void
836 hammer_free_hmp(struct mount *mp)
837 {
838         hammer_mount_t hmp = (void *)mp->mnt_data;
839         hammer_flush_group_t flg;
840         int count;
841         int dummy;
842
843         /*
844          * Flush anything dirty.  This won't even run if the
845          * filesystem errored-out.
846          */
847         count = 0;
848         while (hammer_flusher_haswork(hmp)) {
849                 hammer_flusher_sync(hmp);
850                 ++count;
851                 if (count >= 5) {
852                         if (count == 5)
853                                 kprintf("HAMMER: umount flushing.");
854                         else
855                                 kprintf(".");
856                         tsleep(&dummy, 0, "hmrufl", hz);
857                 }
858                 if (count == 30) {
859                         kprintf("giving up\n");
860                         break;
861                 }
862         }
863         if (count >= 5 && count < 30)
864                 kprintf("\n");
865
866         /*
867          * If the mount had a critical error we have to destroy any
868          * remaining inodes before we can finish cleaning up the flusher.
869          */
870         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
871                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
872                         hammer_destroy_inode_callback, NULL);
873         }
874
875         /*
876          * There shouldn't be any inodes left now and any left over
877          * flush groups should now be empty.
878          */
879         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
880         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
881                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
882                 KKASSERT(RB_EMPTY(&flg->flush_tree));
883                 if (flg->refs) {
884                         kprintf("HAMMER: Warning, flush_group %p was "
885                                 "not empty on umount!\n", flg);
886                 }
887                 kfree(flg, hmp->m_misc);
888         }
889
890         /*
891          * We can finally destroy the flusher
892          */
893         hammer_flusher_destroy(hmp);
894
895         /*
896          * We may have held recovered buffers due to a read-only mount.
897          * These must be discarded.
898          */
899         if (hmp->ronly)
900                 hammer_recover_flush_buffers(hmp, NULL, -1);
901
902         /*
903          * Unload buffers and then volumes
904          */
905         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
906                 hammer_unload_buffer, NULL);
907         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
908                 hammer_unload_volume, NULL);
909
910         mp->mnt_data = NULL;
911         mp->mnt_flag &= ~MNT_LOCAL;
912         hmp->mp = NULL;
913         hammer_destroy_objid_cache(hmp);
914         hammer_destroy_dedup_cache(hmp);
915         if (hmp->dedup_free_cache != NULL) {
916                 kfree(hmp->dedup_free_cache, hmp->m_misc);
917                 hmp->dedup_free_cache = NULL;
918         }
919         kmalloc_destroy(&hmp->m_misc);
920         kmalloc_destroy(&hmp->m_inodes);
921         lwkt_reltoken(&hmp->fs_token);
922         kfree(hmp, M_HAMMER);
923 }
924
925 /*
926  * Report critical errors.  ip may be NULL.
927  */
928 void
929 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
930                       int error, const char *msg)
931 {
932         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
933
934         krateprintf(&hmp->krate,
935                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
936                     hmp->mp->mnt_stat.f_mntfromname,
937                     (intmax_t)(ip ? ip->obj_id : -1),
938                     error, msg);
939
940         if (hmp->ronly == 0) {
941                 hmp->ronly = 2;         /* special errored read-only mode */
942                 hmp->mp->mnt_flag |= MNT_RDONLY;
943                 kprintf("HAMMER(%s): Forcing read-only mode\n",
944                         hmp->mp->mnt_stat.f_mntfromname);
945         }
946         hmp->error = error;
947         if (hammer_debug_critical)
948                 Debugger("Entering debugger");
949 }
950
951
952 /*
953  * Obtain a vnode for the specified inode number.  An exclusively locked
954  * vnode is returned.
955  */
956 int
957 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
958                 ino_t ino, struct vnode **vpp)
959 {
960         struct hammer_transaction trans;
961         struct hammer_mount *hmp = (void *)mp->mnt_data;
962         struct hammer_inode *ip;
963         int error;
964         u_int32_t localization;
965
966         lwkt_gettoken(&hmp->fs_token);
967         hammer_simple_transaction(&trans, hmp);
968
969         /*
970          * If a directory vnode is supplied (mainly NFS) then we can acquire
971          * the PFS domain from it.  Otherwise we would only be able to vget
972          * inodes in the root PFS.
973          */
974         if (dvp) {
975                 localization = HAMMER_DEF_LOCALIZATION +
976                                 VTOI(dvp)->obj_localization;
977         } else {
978                 localization = HAMMER_DEF_LOCALIZATION;
979         }
980
981         /*
982          * Lookup the requested HAMMER inode.  The structure must be
983          * left unlocked while we manipulate the related vnode to avoid
984          * a deadlock.
985          */
986         ip = hammer_get_inode(&trans, NULL, ino,
987                               hmp->asof, localization,
988                               0, &error);
989         if (ip == NULL) {
990                 *vpp = NULL;
991         } else {
992                 error = hammer_get_vnode(ip, vpp);
993                 hammer_rel_inode(ip, 0);
994         }
995         hammer_done_transaction(&trans);
996         lwkt_reltoken(&hmp->fs_token);
997         return (error);
998 }
999
1000 /*
1001  * Return the root vnode for the filesystem.
1002  *
1003  * HAMMER stores the root vnode in the hammer_mount structure so
1004  * getting it is easy.
1005  */
1006 static int
1007 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1008 {
1009         int error;
1010
1011         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1012         return (error);
1013 }
1014
1015 static int
1016 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1017 {
1018         struct hammer_mount *hmp = (void *)mp->mnt_data;
1019         hammer_volume_t volume;
1020         hammer_volume_ondisk_t ondisk;
1021         int error;
1022         int64_t bfree;
1023         int64_t breserved;
1024
1025         lwkt_gettoken(&hmp->fs_token);
1026         volume = hammer_get_root_volume(hmp, &error);
1027         if (error) {
1028                 lwkt_reltoken(&hmp->fs_token);
1029                 return(error);
1030         }
1031         ondisk = volume->ondisk;
1032
1033         /*
1034          * Basic stats
1035          */
1036         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1037         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1038         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1039         hammer_rel_volume(volume, 0);
1040
1041         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1042         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1043         if (mp->mnt_stat.f_files < 0)
1044                 mp->mnt_stat.f_files = 0;
1045
1046         *sbp = mp->mnt_stat;
1047         lwkt_reltoken(&hmp->fs_token);
1048         return(0);
1049 }
1050
1051 static int
1052 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1053 {
1054         struct hammer_mount *hmp = (void *)mp->mnt_data;
1055         hammer_volume_t volume;
1056         hammer_volume_ondisk_t ondisk;
1057         int error;
1058         int64_t bfree;
1059         int64_t breserved;
1060
1061         lwkt_gettoken(&hmp->fs_token);
1062         volume = hammer_get_root_volume(hmp, &error);
1063         if (error) {
1064                 lwkt_reltoken(&hmp->fs_token);
1065                 return(error);
1066         }
1067         ondisk = volume->ondisk;
1068
1069         /*
1070          * Basic stats
1071          */
1072         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1073         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1074         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1075         hammer_rel_volume(volume, 0);
1076
1077         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1078         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1079         if (mp->mnt_vstat.f_files < 0)
1080                 mp->mnt_vstat.f_files = 0;
1081         *sbp = mp->mnt_vstat;
1082         lwkt_reltoken(&hmp->fs_token);
1083         return(0);
1084 }
1085
1086 /*
1087  * Sync the filesystem.  Currently we have to run it twice, the second
1088  * one will advance the undo start index to the end index, so if a crash
1089  * occurs no undos will be run on mount.
1090  *
1091  * We do not sync the filesystem if we are called from a panic.  If we did
1092  * we might end up blowing up a sync that was already in progress.
1093  */
1094 static int
1095 hammer_vfs_sync(struct mount *mp, int waitfor)
1096 {
1097         struct hammer_mount *hmp = (void *)mp->mnt_data;
1098         int error;
1099
1100         lwkt_gettoken(&hmp->fs_token);
1101         if (panicstr == NULL) {
1102                 error = hammer_sync_hmp(hmp, waitfor);
1103         } else {
1104                 error = EIO;
1105         }
1106         lwkt_reltoken(&hmp->fs_token);
1107         return (error);
1108 }
1109
1110 /*
1111  * Convert a vnode to a file handle.
1112  *
1113  * Accesses read-only fields on already-referenced structures so
1114  * no token is needed.
1115  */
1116 static int
1117 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1118 {
1119         hammer_inode_t ip;
1120
1121         KKASSERT(MAXFIDSZ >= 16);
1122         ip = VTOI(vp);
1123         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1124         fhp->fid_ext = ip->obj_localization >> 16;
1125         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1126         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1127         return(0);
1128 }
1129
1130
1131 /*
1132  * Convert a file handle back to a vnode.
1133  *
1134  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1135  * null mount.
1136  */
1137 static int
1138 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1139                   struct fid *fhp, struct vnode **vpp)
1140 {
1141         hammer_mount_t hmp = (void *)mp->mnt_data;
1142         struct hammer_transaction trans;
1143         struct hammer_inode *ip;
1144         struct hammer_inode_info info;
1145         int error;
1146         u_int32_t localization;
1147
1148         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1149         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1150         if (rootvp)
1151                 localization = VTOI(rootvp)->obj_localization;
1152         else
1153                 localization = (u_int32_t)fhp->fid_ext << 16;
1154
1155         lwkt_gettoken(&hmp->fs_token);
1156         hammer_simple_transaction(&trans, hmp);
1157
1158         /*
1159          * Get/allocate the hammer_inode structure.  The structure must be
1160          * unlocked while we manipulate the related vnode to avoid a
1161          * deadlock.
1162          */
1163         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1164                               info.obj_asof, localization, 0, &error);
1165         if (ip) {
1166                 error = hammer_get_vnode(ip, vpp);
1167                 hammer_rel_inode(ip, 0);
1168         } else {
1169                 *vpp = NULL;
1170         }
1171         hammer_done_transaction(&trans);
1172         lwkt_reltoken(&hmp->fs_token);
1173         return (error);
1174 }
1175
1176 static int
1177 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1178                     int *exflagsp, struct ucred **credanonp)
1179 {
1180         hammer_mount_t hmp = (void *)mp->mnt_data;
1181         struct netcred *np;
1182         int error;
1183
1184         lwkt_gettoken(&hmp->fs_token);
1185         np = vfs_export_lookup(mp, &hmp->export, nam);
1186         if (np) {
1187                 *exflagsp = np->netc_exflags;
1188                 *credanonp = &np->netc_anon;
1189                 error = 0;
1190         } else {
1191                 error = EACCES;
1192         }
1193         lwkt_reltoken(&hmp->fs_token);
1194         return (error);
1195
1196 }
1197
1198 int
1199 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1200 {
1201         hammer_mount_t hmp = (void *)mp->mnt_data;
1202         int error;
1203
1204         lwkt_gettoken(&hmp->fs_token);
1205
1206         switch(op) {
1207         case MOUNTCTL_SET_EXPORT:
1208                 error = vfs_export(mp, &hmp->export, export);
1209                 break;
1210         default:
1211                 error = EOPNOTSUPP;
1212                 break;
1213         }
1214         lwkt_reltoken(&hmp->fs_token);
1215
1216         return(error);
1217 }
1218