328a9d93e07b9775a6bbcc3ffe017a2b06eed0c5
[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;
109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
110 int hammer_limit_redo = 4096 * 1024;    /* per inode */
111 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
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            "Number of cache entries");
178 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
179            &hammer_limit_redo, 0, "");
180
181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
182            &hammer_count_fsyncs, 0, "");
183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
184            &hammer_count_inodes, 0, "");
185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
186            &hammer_count_iqueued, 0, "");
187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
188            &hammer_count_reclaiming, 0, "");
189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
190            &hammer_count_records, 0, "");
191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
192            &hammer_count_record_datas, 0, "");
193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
194            &hammer_count_volumes, 0, "");
195 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
196            &hammer_count_buffers, 0, "");
197 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
198            &hammer_count_nodes, 0, "");
199 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
200            &hammer_count_extra_space_used, 0, "");
201
202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
203            &hammer_stats_btree_searches, 0, "");
204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
205            &hammer_stats_btree_lookups, 0, "");
206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
207            &hammer_stats_btree_inserts, 0, "");
208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
209            &hammer_stats_btree_deletes, 0, "");
210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
211            &hammer_stats_btree_elements, 0, "");
212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
213            &hammer_stats_btree_splits, 0, "");
214 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
215            &hammer_stats_btree_iterations, 0, "");
216 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
217            &hammer_stats_btree_root_iterations, 0, "");
218 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
219            &hammer_stats_record_iterations, 0, "");
220
221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
222            &hammer_stats_file_read, 0, "");
223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
224            &hammer_stats_file_write, 0, "");
225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
226            &hammer_stats_file_iopsr, 0, "");
227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
228            &hammer_stats_file_iopsw, 0, "");
229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
230            &hammer_stats_disk_read, 0, "");
231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
232            &hammer_stats_disk_write, 0, "");
233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
234            &hammer_stats_inode_flushes, 0, "");
235 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
236            &hammer_stats_commits, 0, "");
237 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
238            &hammer_stats_undo, 0, "");
239 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
240            &hammer_stats_redo, 0, "");
241
242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
243             &hammer_live_dedup_vnode_bcmps, 0,
244             "successful vnode buffer comparisons");
245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
246             &hammer_live_dedup_device_bcmps, 0,
247             "successful device buffer comparisons");
248 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
249             &hammer_live_dedup_findblk_failures, 0,
250             "block lookup failures for comparison");
251 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
252             &hammer_live_dedup_bmap_saves, 0,
253             "useful physical block lookups");
254
255 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
256            &hammer_count_dirtybufspace, 0, "");
257 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
258            &hammer_count_refedbufs, 0, "");
259 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
260            &hammer_count_reservations, 0, "");
261 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
262            &hammer_count_io_running_read, 0, "");
263 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
264            &hammer_count_io_locked, 0, "");
265 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
266            &hammer_count_io_running_write, 0, "");
267 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
268            &hammer_zone_limit, 0, "");
269 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
270            &hammer_contention_count, 0, "");
271 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
272            &hammer_autoflush, 0, "");
273 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
274            &hammer_verify_zone, 0, "");
275 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
276            &hammer_verify_data, 0, "");
277 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
278            &hammer_write_mode, 0, "");
279 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
280            &hammer_yield_check, 0, "");
281 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
282            &hammer_fsync_mode, 0, "");
283
284 KTR_INFO_MASTER(hammer);
285
286 /*
287  * VFS ABI
288  */
289 static void     hammer_free_hmp(struct mount *mp);
290
291 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
292                                 struct ucred *cred);
293 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
294 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
295 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
296                                 struct ucred *cred);
297 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
298                                 struct ucred *cred);
299 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
300 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
301                                 ino_t ino, struct vnode **vpp);
302 static int      hammer_vfs_init(struct vfsconf *conf);
303 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
304                                 struct fid *fhp, struct vnode **vpp);
305 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
306 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
307                                 int *exflagsp, struct ucred **credanonp);
308
309
310 static struct vfsops hammer_vfsops = {
311         .vfs_mount      = hammer_vfs_mount,
312         .vfs_unmount    = hammer_vfs_unmount,
313         .vfs_root       = hammer_vfs_root,
314         .vfs_statfs     = hammer_vfs_statfs,
315         .vfs_statvfs    = hammer_vfs_statvfs,
316         .vfs_sync       = hammer_vfs_sync,
317         .vfs_vget       = hammer_vfs_vget,
318         .vfs_init       = hammer_vfs_init,
319         .vfs_vptofh     = hammer_vfs_vptofh,
320         .vfs_fhtovp     = hammer_vfs_fhtovp,
321         .vfs_checkexp   = hammer_vfs_checkexp
322 };
323
324 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
325
326 VFS_SET(hammer_vfsops, hammer, 0);
327 MODULE_VERSION(hammer, 1);
328
329 static int
330 hammer_vfs_init(struct vfsconf *conf)
331 {
332         int n;
333
334         if (hammer_limit_recs == 0) {
335                 hammer_limit_recs = nbuf * 25;
336                 n = kmalloc_limit(M_HAMMER) / 512;
337                 if (hammer_limit_recs > n)
338                         hammer_limit_recs = n;
339         }
340         if (hammer_limit_dirtybufspace == 0) {
341                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
342                 if (hammer_limit_dirtybufspace < 100)
343                         hammer_limit_dirtybufspace = 100;
344         }
345
346         /*
347          * Set reasonable limits to maintain an I/O pipeline.  This is
348          * used by the flush code which explicitly initiates I/O, and
349          * is per-mount.
350          *
351          * The system-driven buffer cache uses vfs.lorunningspace and
352          * vfs.hirunningspace globally.
353          */
354         if (hammer_limit_running_io == 0)
355                 hammer_limit_running_io = hammer_limit_dirtybufspace;
356         if (hammer_limit_running_io > 10 * 1024 * 1024)
357                 hammer_limit_running_io = 10 * 1024 * 1024;
358
359         /*
360          * The hammer_inode structure detaches from the vnode on reclaim.
361          * This limits the number of inodes in this state to prevent a
362          * memory pool blowout.
363          */
364         if (hammer_limit_reclaim == 0)
365                 hammer_limit_reclaim = desiredvnodes / 10;
366
367         return(0);
368 }
369
370 static int
371 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
372                  struct ucred *cred)
373 {
374         struct hammer_mount_info info;
375         hammer_mount_t hmp;
376         hammer_volume_t rootvol;
377         struct vnode *rootvp;
378         struct vnode *devvp = NULL;
379         const char *upath;      /* volume name in userspace */
380         char *path;             /* volume name in system space */
381         int error;
382         int i;
383         int master_id;
384         char *next_volume_ptr = NULL;
385
386         /*
387          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
388          */
389         if (mntpt == NULL) {
390                 bzero(&info, sizeof(info));
391                 info.asof = 0;
392                 info.hflags = 0;
393                 info.nvolumes = 1;
394
395                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
396
397                 /* Count number of volumes separated by ':' */
398                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
399                         if (*p == ':') {
400                                 ++info.nvolumes;
401                         }
402                 }
403
404                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
405         } else {
406                 if ((error = copyin(data, &info, sizeof(info))) != 0)
407                         return (error);
408         }
409
410         /*
411          * updating or new mount
412          */
413         if (mp->mnt_flag & MNT_UPDATE) {
414                 hmp = (void *)mp->mnt_data;
415                 KKASSERT(hmp != NULL);
416         } else {
417                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
418                         return (EINVAL);
419                 hmp = NULL;
420         }
421
422         /*
423          * master-id validation.  The master id may not be changed by a
424          * mount update.
425          */
426         if (info.hflags & HMNT_MASTERID) {
427                 if (hmp && hmp->master_id != info.master_id) {
428                         kprintf("hammer: cannot change master id "
429                                 "with mount update\n");
430                         return(EINVAL);
431                 }
432                 master_id = info.master_id;
433                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
434                         return (EINVAL);
435         } else {
436                 if (hmp)
437                         master_id = hmp->master_id;
438                 else
439                         master_id = 0;
440         }
441
442         /*
443          * Internal mount data structure
444          */
445         if (hmp == NULL) {
446                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
447                 mp->mnt_data = (qaddr_t)hmp;
448                 hmp->mp = mp;
449                 /*TAILQ_INIT(&hmp->recycle_list);*/
450
451                 /*
452                  * Make sure kmalloc type limits are set appropriately.
453                  *
454                  * Our inode kmalloc group is sized based on maxvnodes
455                  * (controlled by the system, not us).
456                  */
457                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
458                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
459
460                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
461
462                 hmp->root_btree_beg.localization = 0x00000000U;
463                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
464                 hmp->root_btree_beg.key = -0x8000000000000000LL;
465                 hmp->root_btree_beg.create_tid = 1;
466                 hmp->root_btree_beg.delete_tid = 1;
467                 hmp->root_btree_beg.rec_type = 0;
468                 hmp->root_btree_beg.obj_type = 0;
469
470                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
471                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
472                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
473                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
474                 hmp->root_btree_end.delete_tid = 0;   /* special case */
475                 hmp->root_btree_end.rec_type = 0xFFFFU;
476                 hmp->root_btree_end.obj_type = 0;
477
478                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
479                 hmp->krate.count = -16; /* initial burst */
480
481                 hmp->sync_lock.refs = 1;
482                 hmp->free_lock.refs = 1;
483                 hmp->undo_lock.refs = 1;
484                 hmp->blkmap_lock.refs = 1;
485                 hmp->snapshot_lock.refs = 1;
486                 hmp->volume_lock.refs = 1;
487
488                 TAILQ_INIT(&hmp->delay_list);
489                 TAILQ_INIT(&hmp->flush_group_list);
490                 TAILQ_INIT(&hmp->objid_cache_list);
491                 TAILQ_INIT(&hmp->undo_lru_list);
492                 TAILQ_INIT(&hmp->reclaim_list);
493
494                 RB_INIT(&hmp->rb_dedup_crc_root);
495                 RB_INIT(&hmp->rb_dedup_off_root);       
496                 TAILQ_INIT(&hmp->dedup_lru_list);
497         }
498         hmp->hflags &= ~HMNT_USERFLAGS;
499         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
500
501         hmp->master_id = master_id;
502
503         if (info.asof) {
504                 mp->mnt_flag |= MNT_RDONLY;
505                 hmp->asof = info.asof;
506         } else {
507                 hmp->asof = HAMMER_MAX_TID;
508         }
509
510         hmp->volume_to_remove = -1;
511
512         /*
513          * Re-open read-write if originally read-only, or vise-versa.
514          *
515          * When going from read-only to read-write execute the stage2
516          * recovery if it has not already been run.
517          */
518         if (mp->mnt_flag & MNT_UPDATE) {
519                 lwkt_gettoken(&hmp->fs_token);
520                 error = 0;
521                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
522                         kprintf("HAMMER read-only -> read-write\n");
523                         hmp->ronly = 0;
524                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
525                                 hammer_adjust_volume_mode, NULL);
526                         rootvol = hammer_get_root_volume(hmp, &error);
527                         if (rootvol) {
528                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
529                                 error = hammer_recover_stage2(hmp, rootvol);
530                                 bcopy(rootvol->ondisk->vol0_blockmap,
531                                       hmp->blockmap,
532                                       sizeof(hmp->blockmap));
533                                 hammer_rel_volume(rootvol, 0);
534                         }
535                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
536                                 hammer_reload_inode, NULL);
537                         /* kernel clears MNT_RDONLY */
538                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
539                         kprintf("HAMMER read-write -> read-only\n");
540                         hmp->ronly = 1; /* messy */
541                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
542                                 hammer_reload_inode, NULL);
543                         hmp->ronly = 0;
544                         hammer_flusher_sync(hmp);
545                         hammer_flusher_sync(hmp);
546                         hammer_flusher_sync(hmp);
547                         hmp->ronly = 1;
548                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
549                                 hammer_adjust_volume_mode, NULL);
550                 }
551                 lwkt_reltoken(&hmp->fs_token);
552                 return(error);
553         }
554
555         RB_INIT(&hmp->rb_vols_root);
556         RB_INIT(&hmp->rb_inos_root);
557         RB_INIT(&hmp->rb_redo_root);
558         RB_INIT(&hmp->rb_nods_root);
559         RB_INIT(&hmp->rb_undo_root);
560         RB_INIT(&hmp->rb_resv_root);
561         RB_INIT(&hmp->rb_bufs_root);
562         RB_INIT(&hmp->rb_pfsm_root);
563
564         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
565
566         TAILQ_INIT(&hmp->volu_list);
567         TAILQ_INIT(&hmp->undo_list);
568         TAILQ_INIT(&hmp->data_list);
569         TAILQ_INIT(&hmp->meta_list);
570         TAILQ_INIT(&hmp->lose_list);
571         TAILQ_INIT(&hmp->iorun_list);
572
573         lwkt_token_init(&hmp->fs_token, 1, "hammerfs");
574         lwkt_token_init(&hmp->io_token, 1, "hammerio");
575
576         lwkt_gettoken(&hmp->fs_token);
577
578         /*
579          * Load volumes
580          */
581         path = objcache_get(namei_oc, M_WAITOK);
582         hmp->nvolumes = -1;
583         for (i = 0; i < info.nvolumes; ++i) {
584                 if (mntpt == NULL) {
585                         /*
586                          * Root mount.
587                          */
588                         KKASSERT(next_volume_ptr != NULL);
589                         strcpy(path, "");
590                         if (*next_volume_ptr != '/') {
591                                 /* relative path */
592                                 strcpy(path, "/dev/");
593                         }
594                         int k;
595                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
596                                 if (*next_volume_ptr == '\0') {
597                                         break;
598                                 } else if (*next_volume_ptr == ':') {
599                                         ++next_volume_ptr;
600                                         break;
601                                 } else {
602                                         path[k] = *next_volume_ptr;
603                                         ++next_volume_ptr;
604                                 }
605                         }
606                         path[k] = '\0';
607
608                         error = 0;
609                         cdev_t dev = kgetdiskbyname(path);
610                         error = bdevvp(dev, &devvp);
611                         if (error) {
612                                 kprintf("hammer_mountroot: can't find devvp\n");
613                         }
614                 } else {
615                         error = copyin(&info.volumes[i], &upath,
616                                        sizeof(char *));
617                         if (error == 0)
618                                 error = copyinstr(upath, path,
619                                                   MAXPATHLEN, NULL);
620                 }
621                 if (error == 0)
622                         error = hammer_install_volume(hmp, path, devvp);
623                 if (error)
624                         break;
625         }
626         objcache_put(namei_oc, path);
627
628         /*
629          * Make sure we found a root volume
630          */
631         if (error == 0 && hmp->rootvol == NULL) {
632                 kprintf("hammer_mount: No root volume found!\n");
633                 error = EINVAL;
634         }
635
636         /*
637          * Check that all required volumes are available
638          */
639         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
640                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
641                 error = EINVAL;
642         }
643
644         if (error) {
645                 /* called with fs_token held */
646                 hammer_free_hmp(mp);
647                 return (error);
648         }
649
650         /*
651          * No errors, setup enough of the mount point so we can lookup the
652          * root vnode.
653          */
654         mp->mnt_iosize_max = MAXPHYS;
655         mp->mnt_kern_flag |= MNTK_FSMID;
656
657         /*
658          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
659          * will acquire a per-mount token prior to entry and release it
660          * on return, so even if we do not specify it we no longer get
661          * the BGL regardlless of how we are flagged.
662          */
663         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
664         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
665
666         /* 
667          * note: f_iosize is used by vnode_pager_haspage() when constructing
668          * its VOP_BMAP call.
669          */
670         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
671         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
672
673         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
674         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
675
676         mp->mnt_maxsymlinklen = 255;
677         mp->mnt_flag |= MNT_LOCAL;
678
679         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
680         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
681         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
682
683         /*
684          * The root volume's ondisk pointer is only valid if we hold a
685          * reference to it.
686          */
687         rootvol = hammer_get_root_volume(hmp, &error);
688         if (error)
689                 goto failed;
690
691         /*
692          * Perform any necessary UNDO operations.  The recovery code does
693          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
694          * and then re-copy it again after recovery is complete.
695          *
696          * If this is a read-only mount the UNDO information is retained
697          * in memory in the form of dirty buffer cache buffers, and not
698          * written back to the media.
699          */
700         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
701               sizeof(hmp->blockmap));
702
703         /*
704          * Check filesystem version
705          */
706         hmp->version = rootvol->ondisk->vol_version;
707         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
708             hmp->version > HAMMER_VOL_VERSION_MAX) {
709                 kprintf("HAMMER: mount unsupported fs version %d\n",
710                         hmp->version);
711                 error = ERANGE;
712                 goto done;
713         }
714
715         /*
716          * The undo_rec_limit limits the size of flush groups to avoid
717          * blowing out the UNDO FIFO.  This calculation is typically in
718          * the tens of thousands and is designed primarily when small
719          * HAMMER filesystems are created.
720          */
721         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
722         if (hammer_debug_general & 0x0001)
723                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
724
725         /*
726          * NOTE: Recover stage1 not only handles meta-data recovery, it
727          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
728          */
729         error = hammer_recover_stage1(hmp, rootvol);
730         if (error) {
731                 kprintf("Failed to recover HAMMER filesystem on mount\n");
732                 goto done;
733         }
734
735         /*
736          * Finish setup now that we have a good root volume.
737          *
738          * The top 16 bits of fsid.val[1] is a pfs id.
739          */
740         ksnprintf(mp->mnt_stat.f_mntfromname,
741                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
742                   rootvol->ondisk->vol_name);
743         mp->mnt_stat.f_fsid.val[0] =
744                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
745         mp->mnt_stat.f_fsid.val[1] =
746                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
747         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
748
749         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
750         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
751                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
752
753         /*
754          * Certain often-modified fields in the root volume are cached in
755          * the hammer_mount structure so we do not have to generate lots
756          * of little UNDO structures for them.
757          *
758          * Recopy after recovery.  This also has the side effect of
759          * setting our cached undo FIFO's first_offset, which serves to
760          * placemark the FIFO start for the NEXT flush cycle while the
761          * on-disk first_offset represents the LAST flush cycle.
762          */
763         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
764         hmp->flush_tid1 = hmp->next_tid;
765         hmp->flush_tid2 = hmp->next_tid;
766         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
767               sizeof(hmp->blockmap));
768         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
769
770         hammer_flusher_create(hmp);
771
772         /*
773          * Locate the root directory using the root cluster's B-Tree as a
774          * starting point.  The root directory uses an obj_id of 1.
775          *
776          * FUTURE: Leave the root directory cached referenced but unlocked
777          * in hmp->rootvp (need to flush it on unmount).
778          */
779         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
780         if (error)
781                 goto done;
782         vput(rootvp);
783         /*vn_unlock(hmp->rootvp);*/
784         if (hmp->ronly == 0)
785                 error = hammer_recover_stage2(hmp, rootvol);
786
787         /*
788          * If the stage2 recovery fails be sure to clean out all cached
789          * vnodes before throwing away the mount structure or bad things
790          * will happen.
791          */
792         if (error)
793                 vflush(mp, 0, 0);
794
795 done:
796         hammer_rel_volume(rootvol, 0);
797 failed:
798         /*
799          * Cleanup and return.
800          */
801         if (error) {
802                 /* called with fs_token held */
803                 hammer_free_hmp(mp);
804         } else {
805                 lwkt_reltoken(&hmp->fs_token);
806         }
807         return (error);
808 }
809
810 static int
811 hammer_vfs_unmount(struct mount *mp, int mntflags)
812 {
813         hammer_mount_t hmp = (void *)mp->mnt_data;
814         int flags;
815         int error;
816
817         /*
818          * Clean out the vnodes
819          */
820         lwkt_gettoken(&hmp->fs_token);
821         flags = 0;
822         if (mntflags & MNT_FORCE)
823                 flags |= FORCECLOSE;
824         error = vflush(mp, 0, flags);
825
826         /*
827          * Clean up the internal mount structure and related entities.  This
828          * may issue I/O.
829          */
830         if (error == 0) {
831                 /* called with fs_token held */
832                 hammer_free_hmp(mp);
833         } else {
834                 lwkt_reltoken(&hmp->fs_token);
835         }
836         return(error);
837 }
838
839 /*
840  * Clean up the internal mount structure and disassociate it from the mount.
841  * This may issue I/O.
842  *
843  * Called with fs_token held.
844  */
845 static void
846 hammer_free_hmp(struct mount *mp)
847 {
848         hammer_mount_t hmp = (void *)mp->mnt_data;
849         hammer_flush_group_t flg;
850         int count;
851         int dummy;
852
853         /*
854          * Flush anything dirty.  This won't even run if the
855          * filesystem errored-out.
856          */
857         count = 0;
858         while (hammer_flusher_haswork(hmp)) {
859                 hammer_flusher_sync(hmp);
860                 ++count;
861                 if (count >= 5) {
862                         if (count == 5)
863                                 kprintf("HAMMER: umount flushing.");
864                         else
865                                 kprintf(".");
866                         tsleep(&dummy, 0, "hmrufl", hz);
867                 }
868                 if (count == 30) {
869                         kprintf("giving up\n");
870                         break;
871                 }
872         }
873         if (count >= 5 && count < 30)
874                 kprintf("\n");
875
876         /*
877          * If the mount had a critical error we have to destroy any
878          * remaining inodes before we can finish cleaning up the flusher.
879          */
880         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
881                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
882                         hammer_destroy_inode_callback, NULL);
883         }
884
885         /*
886          * There shouldn't be any inodes left now and any left over
887          * flush groups should now be empty.
888          */
889         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
890         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
891                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
892                 KKASSERT(RB_EMPTY(&flg->flush_tree));
893                 if (flg->refs) {
894                         kprintf("HAMMER: Warning, flush_group %p was "
895                                 "not empty on umount!\n", flg);
896                 }
897                 kfree(flg, hmp->m_misc);
898         }
899
900         /*
901          * We can finally destroy the flusher
902          */
903         hammer_flusher_destroy(hmp);
904
905         /*
906          * We may have held recovered buffers due to a read-only mount.
907          * These must be discarded.
908          */
909         if (hmp->ronly)
910                 hammer_recover_flush_buffers(hmp, NULL, -1);
911
912         /*
913          * Unload buffers and then volumes
914          */
915         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
916                 hammer_unload_buffer, NULL);
917         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
918                 hammer_unload_volume, NULL);
919
920         mp->mnt_data = NULL;
921         mp->mnt_flag &= ~MNT_LOCAL;
922         hmp->mp = NULL;
923         hammer_destroy_objid_cache(hmp);
924         hammer_destroy_dedup_cache(hmp);
925         if (hmp->dedup_free_cache != NULL) {
926                 kfree(hmp->dedup_free_cache, hmp->m_misc);
927                 hmp->dedup_free_cache = NULL;
928         }
929         kmalloc_destroy(&hmp->m_misc);
930         kmalloc_destroy(&hmp->m_inodes);
931         lwkt_reltoken(&hmp->fs_token);
932         kfree(hmp, M_HAMMER);
933 }
934
935 /*
936  * Report critical errors.  ip may be NULL.
937  */
938 void
939 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
940                       int error, const char *msg)
941 {
942         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
943
944         krateprintf(&hmp->krate,
945                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
946                     hmp->mp->mnt_stat.f_mntfromname,
947                     (intmax_t)(ip ? ip->obj_id : -1),
948                     error, msg);
949
950         if (hmp->ronly == 0) {
951                 hmp->ronly = 2;         /* special errored read-only mode */
952                 hmp->mp->mnt_flag |= MNT_RDONLY;
953                 kprintf("HAMMER(%s): Forcing read-only mode\n",
954                         hmp->mp->mnt_stat.f_mntfromname);
955         }
956         hmp->error = error;
957         if (hammer_debug_critical)
958                 Debugger("Entering debugger");
959 }
960
961
962 /*
963  * Obtain a vnode for the specified inode number.  An exclusively locked
964  * vnode is returned.
965  */
966 int
967 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
968                 ino_t ino, struct vnode **vpp)
969 {
970         struct hammer_transaction trans;
971         struct hammer_mount *hmp = (void *)mp->mnt_data;
972         struct hammer_inode *ip;
973         int error;
974         u_int32_t localization;
975
976         lwkt_gettoken(&hmp->fs_token);
977         hammer_simple_transaction(&trans, hmp);
978
979         /*
980          * If a directory vnode is supplied (mainly NFS) then we can acquire
981          * the PFS domain from it.  Otherwise we would only be able to vget
982          * inodes in the root PFS.
983          */
984         if (dvp) {
985                 localization = HAMMER_DEF_LOCALIZATION +
986                                 VTOI(dvp)->obj_localization;
987         } else {
988                 localization = HAMMER_DEF_LOCALIZATION;
989         }
990
991         /*
992          * Lookup the requested HAMMER inode.  The structure must be
993          * left unlocked while we manipulate the related vnode to avoid
994          * a deadlock.
995          */
996         ip = hammer_get_inode(&trans, NULL, ino,
997                               hmp->asof, localization,
998                               0, &error);
999         if (ip == NULL) {
1000                 *vpp = NULL;
1001         } else {
1002                 error = hammer_get_vnode(ip, vpp);
1003                 hammer_rel_inode(ip, 0);
1004         }
1005         hammer_done_transaction(&trans);
1006         lwkt_reltoken(&hmp->fs_token);
1007         return (error);
1008 }
1009
1010 /*
1011  * Return the root vnode for the filesystem.
1012  *
1013  * HAMMER stores the root vnode in the hammer_mount structure so
1014  * getting it is easy.
1015  */
1016 static int
1017 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1018 {
1019         int error;
1020
1021         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1022         return (error);
1023 }
1024
1025 static int
1026 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1027 {
1028         struct hammer_mount *hmp = (void *)mp->mnt_data;
1029         hammer_volume_t volume;
1030         hammer_volume_ondisk_t ondisk;
1031         int error;
1032         int64_t bfree;
1033         int64_t breserved;
1034
1035         lwkt_gettoken(&hmp->fs_token);
1036         volume = hammer_get_root_volume(hmp, &error);
1037         if (error) {
1038                 lwkt_reltoken(&hmp->fs_token);
1039                 return(error);
1040         }
1041         ondisk = volume->ondisk;
1042
1043         /*
1044          * Basic stats
1045          */
1046         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1047         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1048         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1049         hammer_rel_volume(volume, 0);
1050
1051         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1052         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1053         if (mp->mnt_stat.f_files < 0)
1054                 mp->mnt_stat.f_files = 0;
1055
1056         *sbp = mp->mnt_stat;
1057         lwkt_reltoken(&hmp->fs_token);
1058         return(0);
1059 }
1060
1061 static int
1062 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1063 {
1064         struct hammer_mount *hmp = (void *)mp->mnt_data;
1065         hammer_volume_t volume;
1066         hammer_volume_ondisk_t ondisk;
1067         int error;
1068         int64_t bfree;
1069         int64_t breserved;
1070
1071         lwkt_gettoken(&hmp->fs_token);
1072         volume = hammer_get_root_volume(hmp, &error);
1073         if (error) {
1074                 lwkt_reltoken(&hmp->fs_token);
1075                 return(error);
1076         }
1077         ondisk = volume->ondisk;
1078
1079         /*
1080          * Basic stats
1081          */
1082         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1083         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1084         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1085         hammer_rel_volume(volume, 0);
1086
1087         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1088         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1089         if (mp->mnt_vstat.f_files < 0)
1090                 mp->mnt_vstat.f_files = 0;
1091         *sbp = mp->mnt_vstat;
1092         lwkt_reltoken(&hmp->fs_token);
1093         return(0);
1094 }
1095
1096 /*
1097  * Sync the filesystem.  Currently we have to run it twice, the second
1098  * one will advance the undo start index to the end index, so if a crash
1099  * occurs no undos will be run on mount.
1100  *
1101  * We do not sync the filesystem if we are called from a panic.  If we did
1102  * we might end up blowing up a sync that was already in progress.
1103  */
1104 static int
1105 hammer_vfs_sync(struct mount *mp, int waitfor)
1106 {
1107         struct hammer_mount *hmp = (void *)mp->mnt_data;
1108         int error;
1109
1110         lwkt_gettoken(&hmp->fs_token);
1111         if (panicstr == NULL) {
1112                 error = hammer_sync_hmp(hmp, waitfor);
1113         } else {
1114                 error = EIO;
1115         }
1116         lwkt_reltoken(&hmp->fs_token);
1117         return (error);
1118 }
1119
1120 /*
1121  * Convert a vnode to a file handle.
1122  *
1123  * Accesses read-only fields on already-referenced structures so
1124  * no token is needed.
1125  */
1126 static int
1127 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1128 {
1129         hammer_inode_t ip;
1130
1131         KKASSERT(MAXFIDSZ >= 16);
1132         ip = VTOI(vp);
1133         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1134         fhp->fid_ext = ip->obj_localization >> 16;
1135         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1136         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1137         return(0);
1138 }
1139
1140
1141 /*
1142  * Convert a file handle back to a vnode.
1143  *
1144  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1145  * null mount.
1146  */
1147 static int
1148 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1149                   struct fid *fhp, struct vnode **vpp)
1150 {
1151         hammer_mount_t hmp = (void *)mp->mnt_data;
1152         struct hammer_transaction trans;
1153         struct hammer_inode *ip;
1154         struct hammer_inode_info info;
1155         int error;
1156         u_int32_t localization;
1157
1158         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1159         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1160         if (rootvp)
1161                 localization = VTOI(rootvp)->obj_localization;
1162         else
1163                 localization = (u_int32_t)fhp->fid_ext << 16;
1164
1165         lwkt_gettoken(&hmp->fs_token);
1166         hammer_simple_transaction(&trans, hmp);
1167
1168         /*
1169          * Get/allocate the hammer_inode structure.  The structure must be
1170          * unlocked while we manipulate the related vnode to avoid a
1171          * deadlock.
1172          */
1173         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1174                               info.obj_asof, localization, 0, &error);
1175         if (ip) {
1176                 error = hammer_get_vnode(ip, vpp);
1177                 hammer_rel_inode(ip, 0);
1178         } else {
1179                 *vpp = NULL;
1180         }
1181         hammer_done_transaction(&trans);
1182         lwkt_reltoken(&hmp->fs_token);
1183         return (error);
1184 }
1185
1186 static int
1187 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1188                     int *exflagsp, struct ucred **credanonp)
1189 {
1190         hammer_mount_t hmp = (void *)mp->mnt_data;
1191         struct netcred *np;
1192         int error;
1193
1194         lwkt_gettoken(&hmp->fs_token);
1195         np = vfs_export_lookup(mp, &hmp->export, nam);
1196         if (np) {
1197                 *exflagsp = np->netc_exflags;
1198                 *credanonp = &np->netc_anon;
1199                 error = 0;
1200         } else {
1201                 error = EACCES;
1202         }
1203         lwkt_reltoken(&hmp->fs_token);
1204         return (error);
1205
1206 }
1207
1208 int
1209 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1210 {
1211         hammer_mount_t hmp = (void *)mp->mnt_data;
1212         int error;
1213
1214         lwkt_gettoken(&hmp->fs_token);
1215
1216         switch(op) {
1217         case MOUNTCTL_SET_EXPORT:
1218                 error = vfs_export(mp, &hmp->export, export);
1219                 break;
1220         default:
1221                 error = EOPNOTSUPP;
1222                 break;
1223         }
1224         lwkt_reltoken(&hmp->fs_token);
1225
1226         return(error);
1227 }
1228