d7598974b05f9b54cd111fc5fcb5b04186eb20af
[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
35 #include <sys/nlookup.h>
36 #include <sys/fcntl.h>
37 #include <sys/sysctl.h>
38
39 #include "hammer.h"
40
41 /*
42  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
43  *        in conditionals.
44  */
45 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
46 int hammer_debug_io;
47 int hammer_debug_general;
48 int hammer_debug_debug = 1;             /* medium-error panics */
49 int hammer_debug_inode;
50 int hammer_debug_locks;
51 int hammer_debug_btree;
52 int hammer_debug_tid;
53 int hammer_debug_recover;               /* -1 will disable, +1 will force */
54 int hammer_debug_recover_faults;
55 int hammer_debug_critical;              /* non-zero enter debugger on error */
56 int hammer_cluster_enable = 1;          /* enable read clustering by default */
57 int hammer_live_dedup = 0;
58 int hammer_tdmux_ticks;
59 int hammer_count_fsyncs;
60 int hammer_count_inodes;
61 int hammer_count_iqueued;
62 int hammer_count_reclaims;
63 int hammer_count_records;
64 int hammer_count_record_datas;
65 int hammer_count_volumes;
66 int hammer_count_buffers;
67 int hammer_count_nodes;
68 int64_t hammer_count_extra_space_used;
69 int64_t hammer_stats_btree_lookups;
70 int64_t hammer_stats_btree_searches;
71 int64_t hammer_stats_btree_inserts;
72 int64_t hammer_stats_btree_deletes;
73 int64_t hammer_stats_btree_elements;
74 int64_t hammer_stats_btree_splits;
75 int64_t hammer_stats_btree_iterations;
76 int64_t hammer_stats_btree_root_iterations;
77 int64_t hammer_stats_record_iterations;
78
79 int64_t hammer_stats_file_read;
80 int64_t hammer_stats_file_write;
81 int64_t hammer_stats_file_iopsr;
82 int64_t hammer_stats_file_iopsw;
83 int64_t hammer_stats_disk_read;
84 int64_t hammer_stats_disk_write;
85 int64_t hammer_stats_inode_flushes;
86 int64_t hammer_stats_commits;
87 int64_t hammer_stats_undo;
88 int64_t hammer_stats_redo;
89
90 long hammer_count_dirtybufspace;        /* global */
91 int hammer_count_refedbufs;             /* global */
92 int hammer_count_reservations;
93 long hammer_count_io_running_read;
94 long hammer_count_io_running_write;
95 int hammer_count_io_locked;
96 long hammer_limit_dirtybufspace;        /* per-mount */
97 int hammer_limit_recs;                  /* as a whole XXX */
98 int hammer_limit_inode_recs = 2048;     /* per inode */
99 int hammer_limit_reclaims;
100 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
101 int hammer_limit_redo = 4096 * 1024;    /* per inode */
102 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
103 int hammer_bio_count;
104 int hammer_verify_zone;
105 int hammer_verify_data = 1;
106 int hammer_write_mode;
107 int hammer_double_buffer;
108 int hammer_btree_full_undo = 1;
109 int hammer_yield_check = 16;
110 int hammer_fsync_mode = 3;
111 int64_t hammer_contention_count;
112 int64_t hammer_zone_limit;
113
114 /*
115  * Live dedup debug counters (sysctls are writable so that counters
116  * can be reset from userspace).
117  */
118 int64_t hammer_live_dedup_vnode_bcmps = 0;
119 int64_t hammer_live_dedup_device_bcmps = 0;
120 int64_t hammer_live_dedup_findblk_failures = 0;
121 int64_t hammer_live_dedup_bmap_saves = 0;
122
123
124 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
125
126 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
127            &hammer_supported_version, 0, "");
128 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
129            &hammer_debug_general, 0, "");
130 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
131            &hammer_debug_io, 0, "");
132 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
133            &hammer_debug_debug, 0, "");
134 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
135            &hammer_debug_inode, 0, "");
136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
137            &hammer_debug_locks, 0, "");
138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
139            &hammer_debug_btree, 0, "");
140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
141            &hammer_debug_tid, 0, "");
142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
143            &hammer_debug_recover, 0, "");
144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
145            &hammer_debug_recover_faults, 0, "");
146 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
147            &hammer_debug_critical, 0, "");
148 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
149            &hammer_cluster_enable, 0, "");
150 /*
151  * 0 - live dedup is disabled
152  * 1 - dedup cache is populated on reads only
153  * 2 - dedup cache is populated on both reads and writes
154  *
155  * LIVE_DEDUP IS DISABLED PERMANENTLY!  This feature appears to cause
156  * blockmap corruption over time so we've turned it off permanently.
157  */
158 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD,
159            &hammer_live_dedup, 0, "Enable live dedup (experimental)");
160 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
161            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
162
163 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
164            &hammer_limit_dirtybufspace, 0, "");
165 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
166            &hammer_limit_recs, 0, "");
167 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
168            &hammer_limit_inode_recs, 0, "");
169 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
170            &hammer_limit_reclaims, 0, "");
171 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
172            &hammer_live_dedup_cache_size, 0,
173            "Number of cache entries");
174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
175            &hammer_limit_redo, 0, "");
176
177 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
178            &hammer_count_fsyncs, 0, "");
179 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
180            &hammer_count_inodes, 0, "");
181 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
182            &hammer_count_iqueued, 0, "");
183 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
184            &hammer_count_reclaims, 0, "");
185 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
186            &hammer_count_records, 0, "");
187 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
188            &hammer_count_record_datas, 0, "");
189 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
190            &hammer_count_volumes, 0, "");
191 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
192            &hammer_count_buffers, 0, "");
193 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
194            &hammer_count_nodes, 0, "");
195 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
196            &hammer_count_extra_space_used, 0, "");
197
198 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
199            &hammer_stats_btree_searches, 0, "");
200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
201            &hammer_stats_btree_lookups, 0, "");
202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
203            &hammer_stats_btree_inserts, 0, "");
204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
205            &hammer_stats_btree_deletes, 0, "");
206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
207            &hammer_stats_btree_elements, 0, "");
208 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
209            &hammer_stats_btree_splits, 0, "");
210 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
211            &hammer_stats_btree_iterations, 0, "");
212 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
213            &hammer_stats_btree_root_iterations, 0, "");
214 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
215            &hammer_stats_record_iterations, 0, "");
216
217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
218            &hammer_stats_file_read, 0, "");
219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
220            &hammer_stats_file_write, 0, "");
221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
222            &hammer_stats_file_iopsr, 0, "");
223 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
224            &hammer_stats_file_iopsw, 0, "");
225 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
226            &hammer_stats_disk_read, 0, "");
227 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
228            &hammer_stats_disk_write, 0, "");
229 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
230            &hammer_stats_inode_flushes, 0, "");
231 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
232            &hammer_stats_commits, 0, "");
233 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
234            &hammer_stats_undo, 0, "");
235 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
236            &hammer_stats_redo, 0, "");
237
238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
239             &hammer_live_dedup_vnode_bcmps, 0,
240             "successful vnode buffer comparisons");
241 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
242             &hammer_live_dedup_device_bcmps, 0,
243             "successful device buffer comparisons");
244 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
245             &hammer_live_dedup_findblk_failures, 0,
246             "block lookup failures for comparison");
247 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
248             &hammer_live_dedup_bmap_saves, 0,
249             "useful physical block lookups");
250
251 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
252            &hammer_count_dirtybufspace, 0, "");
253 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
254            &hammer_count_refedbufs, 0, "");
255 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
256            &hammer_count_reservations, 0, "");
257 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
258            &hammer_count_io_running_read, 0, "");
259 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
260            &hammer_count_io_locked, 0, "");
261 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
262            &hammer_count_io_running_write, 0, "");
263 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
264            &hammer_zone_limit, 0, "");
265 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
266            &hammer_contention_count, 0, "");
267 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
268            &hammer_autoflush, 0, "");
269 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
270            &hammer_verify_zone, 0, "");
271 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
272            &hammer_verify_data, 0, "");
273 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
274            &hammer_write_mode, 0, "");
275 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
276            &hammer_double_buffer, 0, "");
277 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
278            &hammer_btree_full_undo, 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         long n;
333
334         /*
335          * Wait up to this long for an exclusive deadlock to clear
336          * before acquiring a new shared lock on the ip.  The deadlock
337          * may have occured on a b-tree node related to the ip.
338          */
339         if (hammer_tdmux_ticks == 0)
340                 hammer_tdmux_ticks = hz / 5;
341
342         /*
343          * Autosize, but be careful because a hammer filesystem's
344          * reserve is partially calculated based on dirtybufspace,
345          * so we simply cannot allow it to get too large.
346          */
347         if (hammer_limit_recs == 0) {
348                 n = nbuf * 25;
349                 if (n > kmalloc_limit(M_HAMMER) / 512)
350                         n = kmalloc_limit(M_HAMMER) / 512;
351                 if (n > 2 * 1024 * 1024)
352                         n = 2 * 1024 * 1024;
353                 hammer_limit_recs = (int)n;
354         }
355         if (hammer_limit_dirtybufspace == 0) {
356                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
357                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
358                         hammer_limit_dirtybufspace = 1024L * 1024;
359                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
360                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
361         }
362
363         /*
364          * The hammer_inode structure detaches from the vnode on reclaim.
365          * This limits the number of inodes in this state to prevent a
366          * memory pool blowout.
367          */
368         if (hammer_limit_reclaims == 0)
369                 hammer_limit_reclaims = desiredvnodes / 10;
370
371         return(0);
372 }
373
374 static int
375 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
376                  struct ucred *cred)
377 {
378         struct hammer_mount_info info;
379         hammer_mount_t hmp;
380         hammer_volume_t rootvol;
381         struct vnode *rootvp;
382         struct vnode *devvp = NULL;
383         const char *upath;      /* volume name in userspace */
384         char *path;             /* volume name in system space */
385         int error;
386         int i;
387         int master_id;
388         int nvolumes;
389         char *next_volume_ptr = NULL;
390
391         /*
392          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
393          */
394         if (mntpt == NULL) {
395                 bzero(&info, sizeof(info));
396                 info.asof = 0;
397                 info.hflags = 0;
398                 info.nvolumes = 1;
399
400                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
401
402                 /* Count number of volumes separated by ':' */
403                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
404                         if (*p == ':') {
405                                 ++info.nvolumes;
406                         }
407                 }
408
409                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
410         } else {
411                 if ((error = copyin(data, &info, sizeof(info))) != 0)
412                         return (error);
413         }
414
415         /*
416          * updating or new mount
417          */
418         if (mp->mnt_flag & MNT_UPDATE) {
419                 hmp = (void *)mp->mnt_data;
420                 KKASSERT(hmp != NULL);
421         } else {
422                 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
423                         return (EINVAL);
424                 hmp = NULL;
425         }
426
427         /*
428          * master-id validation.  The master id may not be changed by a
429          * mount update.
430          */
431         if (info.hflags & HMNT_MASTERID) {
432                 if (hmp && hmp->master_id != info.master_id) {
433                         kprintf("HAMMER: cannot change master id "
434                                 "with mount update\n");
435                         return(EINVAL);
436                 }
437                 master_id = info.master_id;
438                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
439                         return (EINVAL);
440         } else {
441                 if (hmp)
442                         master_id = hmp->master_id;
443                 else
444                         master_id = 0;
445         }
446
447         /*
448          * Internal mount data structure
449          */
450         if (hmp == NULL) {
451                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
452                 mp->mnt_data = (qaddr_t)hmp;
453                 hmp->mp = mp;
454                 /*TAILQ_INIT(&hmp->recycle_list);*/
455
456                 /*
457                  * Make sure kmalloc type limits are set appropriately.
458                  *
459                  * Our inode kmalloc group is sized based on maxvnodes
460                  * (controlled by the system, not us).
461                  */
462                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
463                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
464
465                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
466
467                 hmp->root_btree_beg.localization = 0x00000000U;
468                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
469                 hmp->root_btree_beg.key = -0x8000000000000000LL;
470                 hmp->root_btree_beg.create_tid = 1;
471                 hmp->root_btree_beg.delete_tid = 1;
472                 hmp->root_btree_beg.rec_type = 0;
473                 hmp->root_btree_beg.obj_type = 0;
474                 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
475
476                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
477                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
478                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
479                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
480                 hmp->root_btree_end.delete_tid = 0;   /* special case */
481                 hmp->root_btree_end.rec_type = 0xFFFFU;
482                 hmp->root_btree_end.obj_type = 0;
483                 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
484
485                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
486                 hmp->krate.count = -16; /* initial burst */
487                 hmp->kdiag.freq = 1;    /* maximum reporting rate (hz) */
488                 hmp->kdiag.count = -16; /* initial burst */
489
490                 hmp->sync_lock.refs = 1;
491                 hmp->free_lock.refs = 1;
492                 hmp->undo_lock.refs = 1;
493                 hmp->blkmap_lock.refs = 1;
494                 hmp->snapshot_lock.refs = 1;
495                 hmp->volume_lock.refs = 1;
496
497                 TAILQ_INIT(&hmp->delay_list);
498                 TAILQ_INIT(&hmp->flush_group_list);
499                 TAILQ_INIT(&hmp->objid_cache_list);
500                 TAILQ_INIT(&hmp->undo_lru_list);
501                 TAILQ_INIT(&hmp->reclaim_list);
502
503                 RB_INIT(&hmp->rb_dedup_crc_root);
504                 RB_INIT(&hmp->rb_dedup_off_root);
505                 TAILQ_INIT(&hmp->dedup_lru_list);
506         }
507         hmp->hflags &= ~HMNT_USERFLAGS;
508         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
509
510         hmp->master_id = master_id;
511
512         if (info.asof) {
513                 mp->mnt_flag |= MNT_RDONLY;
514                 hmp->asof = info.asof;
515         } else {
516                 hmp->asof = HAMMER_MAX_TID;
517         }
518
519         hmp->volume_to_remove = -1;
520
521         /*
522          * Re-open read-write if originally read-only, or vise-versa.
523          *
524          * When going from read-only to read-write execute the stage2
525          * recovery if it has not already been run.
526          */
527         if (mp->mnt_flag & MNT_UPDATE) {
528                 lwkt_gettoken(&hmp->fs_token);
529                 error = 0;
530                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
531                         kprintf("HAMMER: read-only -> read-write\n");
532                         hmp->ronly = 0;
533                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
534                                 hammer_adjust_volume_mode, NULL);
535                         rootvol = hammer_get_root_volume(hmp, &error);
536                         if (rootvol) {
537                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
538                                 error = hammer_recover_stage2(hmp, rootvol);
539                                 bcopy(rootvol->ondisk->vol0_blockmap,
540                                       hmp->blockmap,
541                                       sizeof(hmp->blockmap));
542                                 hammer_rel_volume(rootvol, 0);
543                         }
544                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
545                                 hammer_reload_inode, NULL);
546                         /* kernel clears MNT_RDONLY */
547                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
548                         kprintf("HAMMER: read-write -> read-only\n");
549                         hmp->ronly = 1; /* messy */
550                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
551                                 hammer_reload_inode, NULL);
552                         hmp->ronly = 0;
553                         hammer_flusher_sync(hmp);
554                         hammer_flusher_sync(hmp);
555                         hammer_flusher_sync(hmp);
556                         hmp->ronly = 1;
557                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
558                                 hammer_adjust_volume_mode, NULL);
559                 }
560                 lwkt_reltoken(&hmp->fs_token);
561                 return(error);
562         }
563
564         RB_INIT(&hmp->rb_vols_root);
565         RB_INIT(&hmp->rb_inos_root);
566         RB_INIT(&hmp->rb_redo_root);
567         RB_INIT(&hmp->rb_nods_root);
568         RB_INIT(&hmp->rb_undo_root);
569         RB_INIT(&hmp->rb_resv_root);
570         RB_INIT(&hmp->rb_bufs_root);
571         RB_INIT(&hmp->rb_pfsm_root);
572
573         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
574
575         RB_INIT(&hmp->volu_root);
576         RB_INIT(&hmp->undo_root);
577         RB_INIT(&hmp->data_root);
578         RB_INIT(&hmp->meta_root);
579         RB_INIT(&hmp->lose_root);
580         TAILQ_INIT(&hmp->iorun_list);
581
582         lwkt_token_init(&hmp->fs_token, "hammerfs");
583         lwkt_token_init(&hmp->io_token, "hammerio");
584
585         lwkt_gettoken(&hmp->fs_token);
586
587         /*
588          * Load volumes
589          */
590         path = objcache_get(namei_oc, M_WAITOK);
591         hmp->nvolumes = -1;
592         for (i = 0; i < info.nvolumes; ++i) {
593                 if (mntpt == NULL) {
594                         /*
595                          * Root mount.
596                          */
597                         KKASSERT(next_volume_ptr != NULL);
598                         strcpy(path, "");
599                         if (*next_volume_ptr != '/') {
600                                 /* relative path */
601                                 strcpy(path, "/dev/");
602                         }
603                         int k;
604                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
605                                 if (*next_volume_ptr == '\0') {
606                                         break;
607                                 } else if (*next_volume_ptr == ':') {
608                                         ++next_volume_ptr;
609                                         break;
610                                 } else {
611                                         path[k] = *next_volume_ptr;
612                                         ++next_volume_ptr;
613                                 }
614                         }
615                         path[k] = '\0';
616
617                         error = 0;
618                         cdev_t dev = kgetdiskbyname(path);
619                         error = bdevvp(dev, &devvp);
620                         if (error) {
621                                 kprintf("hammer_mount: can't find devvp\n");
622                         }
623                 } else {
624                         error = copyin(&info.volumes[i], &upath,
625                                        sizeof(char *));
626                         if (error == 0)
627                                 error = copyinstr(upath, path,
628                                                   MAXPATHLEN, NULL);
629                 }
630                 if (error == 0)
631                         error = hammer_install_volume(hmp, path, devvp, NULL);
632                 if (error)
633                         break;
634         }
635         objcache_put(namei_oc, path);
636
637         /*
638          * Make sure we found a root volume
639          */
640         if (hmp->rootvol == NULL) {
641                 kprintf("hammer_mount: No root volume found!\n");
642                 error = EINVAL;
643                 goto failed;
644         }
645
646         /*
647          * Check that all required volumes are available
648          */
649         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
650                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
651                 error = EINVAL;
652                 goto failed;
653         }
654
655         /*
656          * Other errors
657          */
658         if (error) {
659                 kprintf("hammer_mount: Failed to load volumes!\n");
660                 goto failed;
661         }
662
663         nvolumes = hammer_get_installed_volumes(hmp);
664         if (hmp->nvolumes != nvolumes) {
665                 kprintf("hammer_mount: volume header says %d volumes, "
666                         "but %d installed\n",
667                         hmp->nvolumes, nvolumes);
668                 error = EINVAL;
669                 goto failed;
670         }
671
672         /*
673          * No errors, setup enough of the mount point so we can lookup the
674          * root vnode.
675          */
676         mp->mnt_iosize_max = MAXPHYS;
677         mp->mnt_kern_flag |= MNTK_FSMID;
678         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
679
680         /*
681          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
682          * will acquire a per-mount token prior to entry and release it
683          * on return.
684          */
685         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
686         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
687
688         /*
689          * note: f_iosize is used by vnode_pager_haspage() when constructing
690          * its VOP_BMAP call.
691          */
692         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
693         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
694
695         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
696         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
697
698         mp->mnt_maxsymlinklen = 255;
699         mp->mnt_flag |= MNT_LOCAL;
700
701         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
702         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
703         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
704
705         /*
706          * The root volume's ondisk pointer is only valid if we hold a
707          * reference to it.
708          */
709         rootvol = hammer_get_root_volume(hmp, &error);
710         if (error)
711                 goto failed;
712
713         /*
714          * Perform any necessary UNDO operations.  The recovery code does
715          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
716          * and then re-copy it again after recovery is complete.
717          *
718          * If this is a read-only mount the UNDO information is retained
719          * in memory in the form of dirty buffer cache buffers, and not
720          * written back to the media.
721          */
722         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
723               sizeof(hmp->blockmap));
724
725         /*
726          * Check filesystem version
727          */
728         hmp->version = rootvol->ondisk->vol_version;
729         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
730             hmp->version > HAMMER_VOL_VERSION_MAX) {
731                 kprintf("HAMMER: mount unsupported fs version %d\n",
732                         hmp->version);
733                 error = ERANGE;
734                 goto done;
735         }
736
737         /*
738          * The undo_rec_limit limits the size of flush groups to avoid
739          * blowing out the UNDO FIFO.  This calculation is typically in
740          * the tens of thousands and is designed primarily when small
741          * HAMMER filesystems are created.
742          */
743         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
744         if (hammer_debug_general & 0x0001)
745                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
746
747         /*
748          * NOTE: Recover stage1 not only handles meta-data recovery, it
749          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
750          */
751         error = hammer_recover_stage1(hmp, rootvol);
752         if (error) {
753                 kprintf("Failed to recover HAMMER filesystem on mount\n");
754                 goto done;
755         }
756
757         /*
758          * Finish setup now that we have a good root volume.
759          *
760          * The top 16 bits of fsid.val[1] is a pfs id.
761          */
762         ksnprintf(mp->mnt_stat.f_mntfromname,
763                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
764                   rootvol->ondisk->vol_name);
765         mp->mnt_stat.f_fsid.val[0] =
766                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
767         mp->mnt_stat.f_fsid.val[1] =
768                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
769         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
770
771         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
772         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
773                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
774
775         /*
776          * Certain often-modified fields in the root volume are cached in
777          * the hammer_mount structure so we do not have to generate lots
778          * of little UNDO structures for them.
779          *
780          * Recopy after recovery.  This also has the side effect of
781          * setting our cached undo FIFO's first_offset, which serves to
782          * placemark the FIFO start for the NEXT flush cycle while the
783          * on-disk first_offset represents the LAST flush cycle.
784          */
785         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
786         hmp->flush_tid1 = hmp->next_tid;
787         hmp->flush_tid2 = hmp->next_tid;
788         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
789               sizeof(hmp->blockmap));
790         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
791
792         hammer_flusher_create(hmp);
793
794         /*
795          * Locate the root directory using the root cluster's B-Tree as a
796          * starting point.  The root directory uses an obj_id of 1.
797          *
798          * FUTURE: Leave the root directory cached referenced but unlocked
799          * in hmp->rootvp (need to flush it on unmount).
800          */
801         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, &rootvp);
802         if (error)
803                 goto done;
804         vput(rootvp);
805         /*vn_unlock(hmp->rootvp);*/
806         if (hmp->ronly == 0)
807                 error = hammer_recover_stage2(hmp, rootvol);
808
809         /*
810          * If the stage2 recovery fails be sure to clean out all cached
811          * vnodes before throwing away the mount structure or bad things
812          * will happen.
813          */
814         if (error)
815                 vflush(mp, 0, 0);
816
817 done:
818         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
819                 /* New mount */
820
821                 /* Populate info for mount point (NULL pad)*/
822                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
823                 size_t size;
824                 if (mntpt) {
825                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
826                                                         MNAMELEN -1, &size);
827                 } else { /* Root mount */
828                         mp->mnt_stat.f_mntonname[0] = '/';
829                 }
830         }
831         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
832         hammer_rel_volume(rootvol, 0);
833 failed:
834         /*
835          * Cleanup and return.
836          */
837         if (error) {
838                 /* called with fs_token held */
839                 hammer_free_hmp(mp);
840         } else {
841                 lwkt_reltoken(&hmp->fs_token);
842         }
843         return (error);
844 }
845
846 static int
847 hammer_vfs_unmount(struct mount *mp, int mntflags)
848 {
849         hammer_mount_t hmp = (void *)mp->mnt_data;
850         int flags;
851         int error;
852
853         /*
854          * Clean out the vnodes
855          */
856         lwkt_gettoken(&hmp->fs_token);
857         flags = 0;
858         if (mntflags & MNT_FORCE)
859                 flags |= FORCECLOSE;
860         error = vflush(mp, 0, flags);
861
862         /*
863          * Clean up the internal mount structure and related entities.  This
864          * may issue I/O.
865          */
866         if (error == 0) {
867                 /* called with fs_token held */
868                 hammer_free_hmp(mp);
869         } else {
870                 lwkt_reltoken(&hmp->fs_token);
871         }
872         return(error);
873 }
874
875 /*
876  * Clean up the internal mount structure and disassociate it from the mount.
877  * This may issue I/O.
878  *
879  * Called with fs_token held.
880  */
881 static void
882 hammer_free_hmp(struct mount *mp)
883 {
884         hammer_mount_t hmp = (void *)mp->mnt_data;
885         hammer_flush_group_t flg;
886
887         /*
888          * Flush anything dirty.  This won't even run if the
889          * filesystem errored-out.
890          */
891         hammer_flush_dirty(hmp, 30);
892
893         /*
894          * If the mount had a critical error we have to destroy any
895          * remaining inodes before we can finish cleaning up the flusher.
896          */
897         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
898                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
899                         hammer_destroy_inode_callback, NULL);
900         }
901
902         /*
903          * There shouldn't be any inodes left now and any left over
904          * flush groups should now be empty.
905          */
906         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
907         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
908                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
909                 KKASSERT(RB_EMPTY(&flg->flush_tree));
910                 if (flg->refs) {
911                         kprintf("HAMMER: Warning, flush_group %p was "
912                                 "not empty on umount!\n", flg);
913                 }
914                 kfree(flg, hmp->m_misc);
915         }
916
917         /*
918          * We can finally destroy the flusher
919          */
920         hammer_flusher_destroy(hmp);
921
922         /*
923          * We may have held recovered buffers due to a read-only mount.
924          * These must be discarded.
925          */
926         if (hmp->ronly)
927                 hammer_recover_flush_buffers(hmp, NULL, -1);
928
929         /*
930          * Unload buffers and then volumes
931          */
932         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
933                 hammer_unload_buffer, NULL);
934         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
935                 hammer_unload_volume, NULL);
936
937         mp->mnt_data = NULL;
938         mp->mnt_flag &= ~MNT_LOCAL;
939         hmp->mp = NULL;
940         hammer_destroy_objid_cache(hmp);
941         hammer_destroy_dedup_cache(hmp);
942         if (hmp->dedup_free_cache != NULL) {
943                 kfree(hmp->dedup_free_cache, hmp->m_misc);
944                 hmp->dedup_free_cache = NULL;
945         }
946         kmalloc_destroy(&hmp->m_misc);
947         kmalloc_destroy(&hmp->m_inodes);
948         lwkt_reltoken(&hmp->fs_token);
949         kfree(hmp, M_HAMMER);
950 }
951
952 /*
953  * Report critical errors.  ip may be NULL.
954  */
955 void
956 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
957                       int error, const char *msg)
958 {
959         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
960
961         krateprintf(&hmp->krate,
962                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
963                     hmp->mp->mnt_stat.f_mntfromname,
964                     (intmax_t)(ip ? ip->obj_id : -1),
965                     error, msg);
966
967         if (hmp->ronly == 0) {
968                 hmp->ronly = 2;         /* special errored read-only mode */
969                 hmp->mp->mnt_flag |= MNT_RDONLY;
970                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
971                         hammer_adjust_volume_mode, NULL);
972                 kprintf("HAMMER(%s): Forcing read-only mode\n",
973                         hmp->mp->mnt_stat.f_mntfromname);
974         }
975         hmp->error = error;
976         if (hammer_debug_critical)
977                 Debugger("Entering debugger");
978 }
979
980
981 /*
982  * Obtain a vnode for the specified inode number.  An exclusively locked
983  * vnode is returned.
984  */
985 int
986 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
987                 ino_t ino, struct vnode **vpp)
988 {
989         struct hammer_transaction trans;
990         struct hammer_mount *hmp = (void *)mp->mnt_data;
991         struct hammer_inode *ip;
992         int error;
993         u_int32_t localization;
994
995         lwkt_gettoken(&hmp->fs_token);
996         hammer_simple_transaction(&trans, hmp);
997
998         /*
999          * If a directory vnode is supplied (mainly NFS) then we can acquire
1000          * the PFS domain from it.  Otherwise we would only be able to vget
1001          * inodes in the root PFS.
1002          */
1003         if (dvp) {
1004                 localization = HAMMER_DEF_LOCALIZATION +
1005                                 VTOI(dvp)->obj_localization;
1006         } else {
1007                 localization = HAMMER_DEF_LOCALIZATION;
1008         }
1009
1010         /*
1011          * Lookup the requested HAMMER inode.  The structure must be
1012          * left unlocked while we manipulate the related vnode to avoid
1013          * a deadlock.
1014          */
1015         ip = hammer_get_inode(&trans, NULL, ino,
1016                               hmp->asof, localization,
1017                               0, &error);
1018         if (ip == NULL) {
1019                 *vpp = NULL;
1020         } else {
1021                 error = hammer_get_vnode(ip, vpp);
1022                 hammer_rel_inode(ip, 0);
1023         }
1024         hammer_done_transaction(&trans);
1025         lwkt_reltoken(&hmp->fs_token);
1026         return (error);
1027 }
1028
1029 /*
1030  * Return the root vnode for the filesystem.
1031  *
1032  * HAMMER stores the root vnode in the hammer_mount structure so
1033  * getting it is easy.
1034  */
1035 static int
1036 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1037 {
1038         int error;
1039
1040         error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp);
1041         return (error);
1042 }
1043
1044 static int
1045 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1046 {
1047         struct hammer_mount *hmp = (void *)mp->mnt_data;
1048         hammer_volume_t volume;
1049         hammer_volume_ondisk_t ondisk;
1050         int error;
1051         int64_t bfree;
1052         int64_t breserved;
1053
1054         lwkt_gettoken(&hmp->fs_token);
1055         volume = hammer_get_root_volume(hmp, &error);
1056         if (error) {
1057                 lwkt_reltoken(&hmp->fs_token);
1058                 return(error);
1059         }
1060         ondisk = volume->ondisk;
1061
1062         /*
1063          * Basic stats
1064          */
1065         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1066         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1067         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1068         hammer_rel_volume(volume, 0);
1069
1070         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1071         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1072         if (mp->mnt_stat.f_files < 0)
1073                 mp->mnt_stat.f_files = 0;
1074
1075         *sbp = mp->mnt_stat;
1076         lwkt_reltoken(&hmp->fs_token);
1077         return(0);
1078 }
1079
1080 static int
1081 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1082 {
1083         struct hammer_mount *hmp = (void *)mp->mnt_data;
1084         hammer_volume_t volume;
1085         hammer_volume_ondisk_t ondisk;
1086         int error;
1087         int64_t bfree;
1088         int64_t breserved;
1089
1090         lwkt_gettoken(&hmp->fs_token);
1091         volume = hammer_get_root_volume(hmp, &error);
1092         if (error) {
1093                 lwkt_reltoken(&hmp->fs_token);
1094                 return(error);
1095         }
1096         ondisk = volume->ondisk;
1097
1098         /*
1099          * Basic stats
1100          */
1101         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1102         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1103         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1104         hammer_rel_volume(volume, 0);
1105
1106         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1107         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1108         if (mp->mnt_vstat.f_files < 0)
1109                 mp->mnt_vstat.f_files = 0;
1110         *sbp = mp->mnt_vstat;
1111         lwkt_reltoken(&hmp->fs_token);
1112         return(0);
1113 }
1114
1115 /*
1116  * Sync the filesystem.  Currently we have to run it twice, the second
1117  * one will advance the undo start index to the end index, so if a crash
1118  * occurs no undos will be run on mount.
1119  *
1120  * We do not sync the filesystem if we are called from a panic.  If we did
1121  * we might end up blowing up a sync that was already in progress.
1122  */
1123 static int
1124 hammer_vfs_sync(struct mount *mp, int waitfor)
1125 {
1126         struct hammer_mount *hmp = (void *)mp->mnt_data;
1127         int error;
1128
1129         lwkt_gettoken(&hmp->fs_token);
1130         if (panicstr == NULL) {
1131                 error = hammer_sync_hmp(hmp, waitfor);
1132         } else {
1133                 error = EIO;
1134         }
1135         lwkt_reltoken(&hmp->fs_token);
1136         return (error);
1137 }
1138
1139 /*
1140  * Convert a vnode to a file handle.
1141  *
1142  * Accesses read-only fields on already-referenced structures so
1143  * no token is needed.
1144  */
1145 static int
1146 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1147 {
1148         hammer_inode_t ip;
1149
1150         KKASSERT(MAXFIDSZ >= 16);
1151         ip = VTOI(vp);
1152         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1153         fhp->fid_ext = ip->obj_localization >> 16;
1154         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1155         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1156         return(0);
1157 }
1158
1159
1160 /*
1161  * Convert a file handle back to a vnode.
1162  *
1163  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1164  * null mount.
1165  */
1166 static int
1167 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1168                   struct fid *fhp, struct vnode **vpp)
1169 {
1170         hammer_mount_t hmp = (void *)mp->mnt_data;
1171         struct hammer_transaction trans;
1172         struct hammer_inode *ip;
1173         struct hammer_inode_info info;
1174         int error;
1175         u_int32_t localization;
1176
1177         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1178         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1179         if (rootvp)
1180                 localization = VTOI(rootvp)->obj_localization;
1181         else
1182                 localization = (u_int32_t)fhp->fid_ext << 16;
1183
1184         lwkt_gettoken(&hmp->fs_token);
1185         hammer_simple_transaction(&trans, hmp);
1186
1187         /*
1188          * Get/allocate the hammer_inode structure.  The structure must be
1189          * unlocked while we manipulate the related vnode to avoid a
1190          * deadlock.
1191          */
1192         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1193                               info.obj_asof, localization, 0, &error);
1194         if (ip) {
1195                 error = hammer_get_vnode(ip, vpp);
1196                 hammer_rel_inode(ip, 0);
1197         } else {
1198                 *vpp = NULL;
1199         }
1200         hammer_done_transaction(&trans);
1201         lwkt_reltoken(&hmp->fs_token);
1202         return (error);
1203 }
1204
1205 static int
1206 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1207                     int *exflagsp, struct ucred **credanonp)
1208 {
1209         hammer_mount_t hmp = (void *)mp->mnt_data;
1210         struct netcred *np;
1211         int error;
1212
1213         lwkt_gettoken(&hmp->fs_token);
1214         np = vfs_export_lookup(mp, &hmp->export, nam);
1215         if (np) {
1216                 *exflagsp = np->netc_exflags;
1217                 *credanonp = &np->netc_anon;
1218                 error = 0;
1219         } else {
1220                 error = EACCES;
1221         }
1222         lwkt_reltoken(&hmp->fs_token);
1223         return (error);
1224
1225 }
1226
1227 int
1228 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1229 {
1230         hammer_mount_t hmp = (void *)mp->mnt_data;
1231         int error;
1232
1233         lwkt_gettoken(&hmp->fs_token);
1234
1235         switch(op) {
1236         case MOUNTCTL_SET_EXPORT:
1237                 error = vfs_export(mp, &hmp->export, export);
1238                 break;
1239         default:
1240                 error = EOPNOTSUPP;
1241                 break;
1242         }
1243         lwkt_reltoken(&hmp->fs_token);
1244
1245         return(error);
1246 }
1247