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/mountctl.h>
36
37 #include "hammer.h"
38
39 /*
40 * NOTE! Global statistics may not be MPSAFE so HAMMER never uses them
41 * in conditionals.
42 */
43 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
44 int hammer_debug_io;
45 int hammer_debug_general;
46 int hammer_debug_inode;
47 int hammer_debug_locks;
48 int hammer_debug_btree;
49 int hammer_debug_tid;
50 int hammer_debug_recover; /* -1 will disable, +1 will force */
51 int hammer_debug_critical; /* non-zero enter debugger on error */
52 int hammer_cluster_enable = 2; /* ena cluster_read, scale x 2 */
53 int hammer_tdmux_ticks;
54 int hammer_count_fsyncs;
55 int hammer_count_inodes;
56 int hammer_count_iqueued;
57 int hammer_count_reclaims;
58 int hammer_count_records;
59 int hammer_count_record_datas;
60 int hammer_count_volumes;
61 int hammer_count_buffers;
62 int hammer_count_nodes;
63 int64_t hammer_stats_btree_lookups;
64 int64_t hammer_stats_btree_searches;
65 int64_t hammer_stats_btree_inserts;
66 int64_t hammer_stats_btree_deletes;
67 int64_t hammer_stats_btree_elements;
68 int64_t hammer_stats_btree_splits;
69 int64_t hammer_stats_btree_iterations;
70 int64_t hammer_stats_btree_root_iterations;
71 int64_t hammer_stats_record_iterations;
72
73 int64_t hammer_stats_file_read;
74 int64_t hammer_stats_file_write;
75 int64_t hammer_stats_disk_read;
76 int64_t hammer_stats_disk_write;
77 int64_t hammer_stats_inode_flushes;
78 int64_t hammer_stats_commits;
79 int64_t hammer_stats_undo;
80 int64_t hammer_stats_redo;
81
82 long hammer_count_dirtybufspace; /* global */
83 int hammer_count_refedbufs; /* global */
84 int hammer_count_reservations;
85 long hammer_count_io_running_read;
86 long hammer_count_io_running_write;
87 int hammer_count_io_locked;
88 long hammer_limit_dirtybufspace; /* per-mount */
89 int hammer_limit_recs; /* as a whole XXX */
90 int hammer_limit_inode_recs = 2048; /* per inode */
91 int hammer_limit_reclaims;
92 int hammer_live_dedup_cache_size = 4096;
93 int hammer_limit_redo = 4096 * 1024; /* per inode */
94 int hammer_autoflush = 500; /* auto flush (typ on reclaim) */
95 int hammer_verify_zone;
96 int hammer_verify_data = 1;
97 int hammer_double_buffer;
98 int hammer_btree_full_undo = 1;
99 int hammer_yield_check = 16;
100 int hammer_fsync_mode = 3;
101 int64_t hammer_contention_count;
102
103 int hammer_noatime = 1;
104 TUNABLE_INT("vfs.hammer.noatime", &hammer_noatime);
105
106 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
107 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
108 &hammer_supported_version, 0, "");
109 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
110 &hammer_debug_general, 0, "");
111 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
112 &hammer_debug_io, 0, "");
113 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
114 &hammer_debug_inode, 0, "");
115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
116 &hammer_debug_locks, 0, "");
117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
118 &hammer_debug_btree, 0, "");
119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
120 &hammer_debug_tid, 0, "");
121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
122 &hammer_debug_recover, 0, "");
123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
124 &hammer_debug_critical, 0, "");
125 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
126 &hammer_cluster_enable, 0, "");
127 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
128 &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
129
130 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
131 &hammer_limit_dirtybufspace, 0, "");
132 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
133 &hammer_limit_recs, 0, "");
134 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
135 &hammer_limit_inode_recs, 0, "");
136 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
137 &hammer_limit_reclaims, 0, "");
138 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
139 &hammer_live_dedup_cache_size, 0,
140 "Number of cache entries");
141 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
142 &hammer_limit_redo, 0, "");
143
144 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
145 &hammer_count_fsyncs, 0, "");
146 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
147 &hammer_count_inodes, 0, "");
148 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
149 &hammer_count_iqueued, 0, "");
150 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
151 &hammer_count_reclaims, 0, "");
152 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
153 &hammer_count_records, 0, "");
154 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
155 &hammer_count_record_datas, 0, "");
156 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
157 &hammer_count_volumes, 0, "");
158 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
159 &hammer_count_buffers, 0, "");
160 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
161 &hammer_count_nodes, 0, "");
162
163 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
164 &hammer_stats_btree_searches, 0, "");
165 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
166 &hammer_stats_btree_lookups, 0, "");
167 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
168 &hammer_stats_btree_inserts, 0, "");
169 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
170 &hammer_stats_btree_deletes, 0, "");
171 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
172 &hammer_stats_btree_elements, 0, "");
173 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
174 &hammer_stats_btree_splits, 0, "");
175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
176 &hammer_stats_btree_iterations, 0, "");
177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
178 &hammer_stats_btree_root_iterations, 0, "");
179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
180 &hammer_stats_record_iterations, 0, "");
181
182 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
183 &hammer_stats_file_read, 0, "");
184 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
185 &hammer_stats_file_write, 0, "");
186 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
187 &hammer_stats_disk_read, 0, "");
188 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
189 &hammer_stats_disk_write, 0, "");
190 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
191 &hammer_stats_inode_flushes, 0, "");
192 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
193 &hammer_stats_commits, 0, "");
194 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
195 &hammer_stats_undo, 0, "");
196 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
197 &hammer_stats_redo, 0, "");
198
199 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
200 &hammer_count_dirtybufspace, 0, "");
201 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
202 &hammer_count_refedbufs, 0, "");
203 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
204 &hammer_count_reservations, 0, "");
205 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
206 &hammer_count_io_running_read, 0, "");
207 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
208 &hammer_count_io_locked, 0, "");
209 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
210 &hammer_count_io_running_write, 0, "");
211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
212 &hammer_contention_count, 0, "");
213 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
214 &hammer_autoflush, 0, "");
215 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
216 &hammer_verify_zone, 0, "");
217 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
218 &hammer_verify_data, 0, "");
219 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
220 &hammer_double_buffer, 0, "");
221 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
222 &hammer_btree_full_undo, 0, "");
223 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
224 &hammer_yield_check, 0, "");
225 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
226 &hammer_fsync_mode, 0, "");
227
228 /* KTR_INFO_MASTER(hammer); */
229
230 /*
231 * VFS ABI
232 */
233 static void hammer_free_hmp(struct mount *mp);
234
235 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
236 struct ucred *cred);
237 static int hammer_vfs_unmount(struct mount *mp, int mntflags);
238 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp);
239 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
240 struct ucred *cred);
241 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
242 struct ucred *cred);
243 static int hammer_vfs_sync(struct mount *mp, int waitfor);
244 static int hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
245 ino_t ino, struct vnode **vpp);
246 static int hammer_vfs_init(struct vfsconf *conf);
247 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
248 struct fid *fhp, struct vnode **vpp);
249 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
250 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
251 int *exflagsp, struct ucred **credanonp);
252
253
254 static struct vfsops hammer_vfsops = {
255 .vfs_flags = 0,
256 .vfs_mount = hammer_vfs_mount,
257 .vfs_unmount = hammer_vfs_unmount,
258 .vfs_root = hammer_vfs_root,
259 .vfs_statfs = hammer_vfs_statfs,
260 .vfs_statvfs = hammer_vfs_statvfs,
261 .vfs_sync = hammer_vfs_sync,
262 .vfs_vget = hammer_vfs_vget,
263 .vfs_init = hammer_vfs_init,
264 .vfs_vptofh = hammer_vfs_vptofh,
265 .vfs_fhtovp = hammer_vfs_fhtovp,
266 .vfs_checkexp = hammer_vfs_checkexp
267 };
268
269 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
270
271 VFS_SET(hammer_vfsops, hammer, VFCF_MPSAFE);
272 MODULE_VERSION(hammer, 1);
273
274 static int
hammer_vfs_init(struct vfsconf * conf)275 hammer_vfs_init(struct vfsconf *conf)
276 {
277 long n;
278
279 /*
280 * Wait up to this long for an exclusive deadlock to clear
281 * before acquiring a new shared lock on the ip. The deadlock
282 * may have occured on a b-tree node related to the ip.
283 */
284 if (hammer_tdmux_ticks == 0)
285 hammer_tdmux_ticks = hz / 5;
286
287 /*
288 * Autosize, but be careful because a hammer filesystem's
289 * reserve is partially calculated based on dirtybufspace,
290 * so we simply cannot allow it to get too large.
291 */
292 if (hammer_limit_recs == 0) {
293 n = nbuf * 25;
294 if (n > kmalloc_limit(M_HAMMER) / 512)
295 n = kmalloc_limit(M_HAMMER) / 512;
296 if (n > 2 * 1024 * 1024)
297 n = 2 * 1024 * 1024;
298 hammer_limit_recs = (int)n;
299 }
300 if (hammer_limit_dirtybufspace == 0) {
301 hammer_limit_dirtybufspace = hidirtybufspace / 2;
302 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
303 hammer_limit_dirtybufspace = 1024L * 1024;
304 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
305 hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
306 }
307
308 /*
309 * The hammer_inode structure detaches from the vnode on reclaim.
310 * This limits the number of inodes in this state to prevent a
311 * memory pool blowout.
312 */
313 if (hammer_limit_reclaims == 0) {
314 hammer_limit_reclaims = maxvnodes / 10;
315 if (hammer_limit_reclaims > HAMMER_LIMIT_RECLAIMS)
316 hammer_limit_reclaims = HAMMER_LIMIT_RECLAIMS;
317 }
318
319 return(0);
320 }
321
322 static int
hammer_vfs_mount(struct mount * mp,char * mntpt,caddr_t data,struct ucred * cred)323 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
324 struct ucred *cred)
325 {
326 struct hammer_mount_info info;
327 hammer_mount_t hmp;
328 hammer_volume_t rootvol;
329 struct vnode *rootvp;
330 struct vnode *devvp = NULL;
331 const char *upath; /* volume name in userspace */
332 char *path; /* volume name in system space */
333 int error;
334 int i;
335 int master_id;
336 int nvolumes;
337 char *next_volume_ptr = NULL;
338
339 if (hammer_noatime) {
340 /* Force noatime */
341 mp->mnt_flag |= MNT_NOATIME;
342 }
343
344 /*
345 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot.
346 */
347 if (mntpt == NULL) {
348 bzero(&info, sizeof(info));
349 info.asof = 0;
350 info.hflags = 0;
351 info.nvolumes = 1;
352
353 next_volume_ptr = mp->mnt_stat.f_mntfromname;
354
355 /* Count number of volumes separated by ':' */
356 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
357 if (*p == ':') {
358 ++info.nvolumes;
359 }
360 }
361
362 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
363 } else {
364 if ((error = copyin(data, &info, sizeof(info))) != 0)
365 return (error);
366 }
367
368 /*
369 * updating or new mount
370 */
371 if (mp->mnt_flag & MNT_UPDATE) {
372 hmp = (void *)mp->mnt_data;
373 KKASSERT(hmp != NULL);
374 } else {
375 if (info.nvolumes <= 0 || info.nvolumes > HAMMER_MAX_VOLUMES)
376 return (EINVAL);
377 hmp = NULL;
378 }
379
380 /*
381 * master-id validation. The master id may not be changed by a
382 * mount update.
383 */
384 if (info.hflags & HMNT_MASTERID || info.hflags & HMNT_NOMIRROR) {
385 if (hmp && hmp->master_id != info.master_id) {
386 hkprintf("cannot change master id with mount update\n");
387 return(EINVAL);
388 }
389 master_id = info.master_id;
390 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
391 return (EINVAL);
392 } else {
393 if (hmp)
394 master_id = hmp->master_id;
395 else
396 master_id = 0;
397 }
398
399 /*
400 * Internal mount data structure
401 */
402 if (hmp == NULL) {
403 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
404 mp->mnt_data = (qaddr_t)hmp;
405 hmp->mp = mp;
406
407 /*
408 * Make sure kmalloc type limits are set appropriately.
409 *
410 * Our inode kmalloc group is sized based on maxvnodes
411 * (controlled by the system, not us).
412 */
413 kmalloc_create(&hmp->m_misc, "HAMMER-others");
414 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
415
416 kmalloc_raise_limit(hmp->m_inodes, 0); /* unlimited */
417
418 hmp->root_btree_beg.localization =
419 HAMMER_MIN_ONDISK_LOCALIZATION;
420 hmp->root_btree_beg.obj_id = HAMMER_MIN_OBJID;
421 hmp->root_btree_beg.key = HAMMER_MIN_KEY;
422 hmp->root_btree_beg.create_tid = 1;
423 hmp->root_btree_beg.delete_tid = 1;
424 hmp->root_btree_beg.rec_type = HAMMER_MIN_RECTYPE;
425 hmp->root_btree_beg.obj_type = 0;
426 hmp->root_btree_beg.btype = HAMMER_BTREE_TYPE_NONE;
427
428 hmp->root_btree_end.localization =
429 HAMMER_MAX_ONDISK_LOCALIZATION;
430 hmp->root_btree_end.obj_id = HAMMER_MAX_OBJID;
431 hmp->root_btree_end.key = HAMMER_MAX_KEY;
432 hmp->root_btree_end.create_tid = HAMMER_MAX_TID;
433 hmp->root_btree_end.delete_tid = 0; /* special case */
434 hmp->root_btree_end.rec_type = HAMMER_MAX_RECTYPE;
435 hmp->root_btree_end.obj_type = 0;
436 hmp->root_btree_end.btype = HAMMER_BTREE_TYPE_NONE;
437
438 hmp->krate.freq = 1; /* maximum reporting rate (hz) */
439 hmp->krate.count = -16; /* initial burst */
440 hmp->kdiag.freq = 1; /* maximum reporting rate (hz) */
441 hmp->kdiag.count = -16; /* initial burst */
442
443 hmp->sync_lock.refs = 1;
444 hmp->undo_lock.refs = 1;
445 hmp->blkmap_lock.refs = 1;
446 hmp->snapshot_lock.refs = 1;
447 hmp->volume_lock.refs = 1;
448
449 TAILQ_INIT(&hmp->delay_list);
450 TAILQ_INIT(&hmp->flush_group_list);
451 TAILQ_INIT(&hmp->objid_cache_list);
452 TAILQ_INIT(&hmp->undo_lru_list);
453 TAILQ_INIT(&hmp->reclaim_list);
454 }
455 hmp->hflags &= ~HMNT_USERFLAGS;
456 hmp->hflags |= info.hflags & HMNT_USERFLAGS;
457
458 hmp->master_id = master_id;
459
460 if (info.asof) {
461 mp->mnt_flag |= MNT_RDONLY;
462 hmp->asof = info.asof;
463 } else {
464 hmp->asof = HAMMER_MAX_TID;
465 }
466
467 hmp->volume_to_remove = -1;
468
469 /*
470 * Re-open read-write if originally read-only, or vise-versa.
471 *
472 * When going from read-only to read-write execute the stage2
473 * recovery if it has not already been run.
474 */
475 if (mp->mnt_flag & MNT_UPDATE) {
476 lwkt_gettoken(&hmp->fs_token);
477 error = 0;
478 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
479 hkprintf("read-only -> read-write\n");
480 hmp->ronly = 0;
481 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
482 hammer_adjust_volume_mode, NULL);
483 rootvol = hammer_get_root_volume(hmp, &error);
484 if (rootvol) {
485 hammer_recover_flush_buffers(hmp, rootvol, 1);
486 error = hammer_recover_stage2(hmp, rootvol);
487 bcopy(rootvol->ondisk->vol0_blockmap,
488 hmp->blockmap,
489 sizeof(hmp->blockmap));
490 hammer_rel_volume(rootvol, 0);
491 }
492 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
493 hammer_reload_inode, NULL);
494 /* kernel clears MNT_RDONLY */
495 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
496 hkprintf("read-write -> read-only\n");
497 hmp->ronly = 1; /* messy */
498 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
499 hammer_reload_inode, NULL);
500 hmp->ronly = 0;
501 hammer_flusher_sync(hmp);
502 hammer_flusher_sync(hmp);
503 hammer_flusher_sync(hmp);
504 hmp->ronly = 1;
505 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
506 hammer_adjust_volume_mode, NULL);
507 }
508 lwkt_reltoken(&hmp->fs_token);
509 return(error);
510 }
511
512 RB_INIT(&hmp->rb_vols_root);
513 RB_INIT(&hmp->rb_inos_root);
514 RB_INIT(&hmp->rb_redo_root);
515 RB_INIT(&hmp->rb_nods_root);
516 RB_INIT(&hmp->rb_undo_root);
517 RB_INIT(&hmp->rb_resv_root);
518 RB_INIT(&hmp->rb_bufs_root);
519 RB_INIT(&hmp->rb_pfsm_root);
520
521 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
522
523 RB_INIT(&hmp->volu_root);
524 RB_INIT(&hmp->undo_root);
525 RB_INIT(&hmp->data_root);
526 RB_INIT(&hmp->meta_root);
527 RB_INIT(&hmp->lose_root);
528 TAILQ_INIT(&hmp->iorun_list);
529
530 lwkt_token_init(&hmp->fs_token, "hammerfs");
531 lwkt_token_init(&hmp->io_token, "hammerio");
532
533 lwkt_gettoken(&hmp->fs_token);
534
535 /*
536 * Load volumes
537 */
538 path = objcache_get(namei_oc, M_WAITOK);
539 hmp->nvolumes = -1;
540 for (i = 0; i < info.nvolumes; ++i) {
541 if (mntpt == NULL) {
542 /*
543 * Root mount.
544 */
545 KKASSERT(next_volume_ptr != NULL);
546 strcpy(path, "");
547 if (*next_volume_ptr != '/') {
548 /* relative path */
549 strcpy(path, "/dev/");
550 }
551 int k;
552 for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
553 if (*next_volume_ptr == '\0') {
554 break;
555 } else if (*next_volume_ptr == ':') {
556 ++next_volume_ptr;
557 break;
558 } else {
559 path[k] = *next_volume_ptr;
560 ++next_volume_ptr;
561 }
562 }
563 path[k] = '\0';
564
565 error = 0;
566 cdev_t dev = kgetdiskbyname(path);
567 error = bdevvp(dev, &devvp);
568 if (error) {
569 hdkprintf("can't find devvp\n");
570 }
571 } else {
572 error = copyin(&info.volumes[i], &upath,
573 sizeof(char *));
574 if (error == 0)
575 error = copyinstr(upath, path,
576 MAXPATHLEN, NULL);
577 }
578 if (error == 0)
579 error = hammer_install_volume(hmp, path, devvp, NULL);
580 if (error)
581 break;
582 }
583 objcache_put(namei_oc, path);
584
585 /*
586 * Make sure we found a root volume
587 */
588 if (hmp->rootvol == NULL) {
589 if (error == EBUSY) {
590 hdkprintf("The volumes are probably mounted\n");
591 } else {
592 hdkprintf("No root volume found!\n");
593 error = EINVAL;
594 }
595 goto failed;
596 }
597
598 /*
599 * Check that all required volumes are available
600 */
601 if (error == 0 && hammer_mountcheck_volumes(hmp)) {
602 hdkprintf("Missing volumes, cannot mount!\n");
603 error = EINVAL;
604 goto failed;
605 }
606
607 /*
608 * Other errors
609 */
610 if (error) {
611 hdkprintf("Failed to load volumes!\n");
612 goto failed;
613 }
614
615 nvolumes = hammer_get_installed_volumes(hmp);
616 if (hmp->nvolumes != nvolumes) {
617 hdkprintf("volume header says %d volumes, but %d installed\n",
618 hmp->nvolumes, nvolumes);
619 error = EINVAL;
620 goto failed;
621 }
622
623 /*
624 * No errors, setup enough of the mount point so we can lookup the
625 * root vnode.
626 */
627 mp->mnt_iosize_max = MAXPHYS;
628 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */
629
630 /*
631 * MPSAFE code. Note that VOPs and VFSops which are not MPSAFE
632 * will acquire a per-mount token prior to entry and release it
633 * on return.
634 */
635 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
636
637 /*
638 * note: f_iosize is used by vnode_pager_haspage() when constructing
639 * its VOP_BMAP call.
640 */
641 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
642 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
643
644 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
645 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
646
647 mp->mnt_maxsymlinklen = 255;
648 mp->mnt_flag |= MNT_LOCAL;
649
650 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
651 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
652 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
653
654 /*
655 * The root volume's ondisk pointer is only valid if we hold a
656 * reference to it.
657 */
658 rootvol = hammer_get_root_volume(hmp, &error);
659 if (error)
660 goto failed;
661
662 /*
663 * Perform any necessary UNDO operations. The recovery code does
664 * call hammer_undo_lookup() so we have to pre-cache the blockmap,
665 * and then re-copy it again after recovery is complete.
666 *
667 * If this is a read-only mount the UNDO information is retained
668 * in memory in the form of dirty buffer cache buffers, and not
669 * written back to the media.
670 */
671 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
672 sizeof(hmp->blockmap));
673
674 /*
675 * Check filesystem version
676 */
677 hmp->version = rootvol->ondisk->vol_version;
678 if (hmp->version < HAMMER_VOL_VERSION_MIN ||
679 hmp->version > HAMMER_VOL_VERSION_MAX) {
680 hkprintf("mount unsupported fs version %d\n", hmp->version);
681 error = ERANGE;
682 goto done;
683 }
684
685 /*
686 * The undo_rec_limit limits the size of flush groups to avoid
687 * blowing out the UNDO FIFO. This calculation is typically in
688 * the tens of thousands and is designed primarily when small
689 * HAMMER filesystems are created.
690 */
691 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
692 if (hammer_debug_general & 0x0001)
693 hkprintf("undo_rec_limit %d\n", hmp->undo_rec_limit);
694
695 /*
696 * NOTE: Recover stage1 not only handles meta-data recovery, it
697 * also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
698 */
699 error = hammer_recover_stage1(hmp, rootvol);
700 if (error) {
701 kprintf("Failed to recover HAMMER filesystem on mount\n");
702 goto done;
703 }
704
705 /*
706 * Finish setup now that we have a good root volume.
707 */
708 ksnprintf(mp->mnt_stat.f_mntfromname,
709 sizeof(mp->mnt_stat.f_mntfromname), "%s",
710 rootvol->ondisk->vol_label);
711 mp->mnt_stat.f_fsid.val[0] =
712 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
713 mp->mnt_stat.f_fsid.val[1] =
714 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
715 mp->mnt_stat.f_fsid.val[1] &= HAMMER_LOCALIZE_MASK;
716
717 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
718 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
719 sizeof(mp->mnt_vstat.f_fsid_uuid));
720
721 /*
722 * Certain often-modified fields in the root volume are cached in
723 * the hammer_mount structure so we do not have to generate lots
724 * of little UNDO structures for them.
725 *
726 * Recopy after recovery. This also has the side effect of
727 * setting our cached undo FIFO's first_offset, which serves to
728 * placemark the FIFO start for the NEXT flush cycle while the
729 * on-disk first_offset represents the LAST flush cycle.
730 */
731 hmp->next_tid = rootvol->ondisk->vol0_next_tid;
732 hmp->flush_tid1 = hmp->next_tid;
733 hmp->flush_tid2 = hmp->next_tid;
734 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
735 sizeof(hmp->blockmap));
736 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
737
738 hammer_flusher_create(hmp);
739
740 /*
741 * Locate the root directory with an obj_id of 1.
742 */
743 error = hammer_vfs_root(mp, &rootvp);
744 if (error)
745 goto done;
746 vput(rootvp);
747 if (hmp->ronly == 0)
748 error = hammer_recover_stage2(hmp, rootvol);
749
750 /*
751 * If the stage2 recovery fails be sure to clean out all cached
752 * vnodes before throwing away the mount structure or bad things
753 * will happen.
754 */
755 if (error)
756 vflush(mp, 0, 0);
757
758 done:
759 if ((mp->mnt_flag & MNT_UPDATE) == 0) {
760 /* New mount */
761
762 /* Populate info for mount point (NULL pad)*/
763 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
764 size_t size;
765 if (mntpt) {
766 copyinstr(mntpt, mp->mnt_stat.f_mntonname,
767 MNAMELEN -1, &size);
768 } else { /* Root mount */
769 mp->mnt_stat.f_mntonname[0] = '/';
770 }
771 }
772 (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
773 hammer_rel_volume(rootvol, 0);
774 failed:
775 /*
776 * Cleanup and return.
777 */
778 if (error) {
779 /* called with fs_token held */
780 hammer_free_hmp(mp);
781 } else {
782 lwkt_reltoken(&hmp->fs_token);
783 }
784 return (error);
785 }
786
787 static int
hammer_vfs_unmount(struct mount * mp,int mntflags)788 hammer_vfs_unmount(struct mount *mp, int mntflags)
789 {
790 hammer_mount_t hmp = (void *)mp->mnt_data;
791 int flags;
792 int error;
793
794 /*
795 * Clean out the vnodes
796 */
797 lwkt_gettoken(&hmp->fs_token);
798 flags = 0;
799 if (mntflags & MNT_FORCE)
800 flags |= FORCECLOSE;
801 error = vflush(mp, 0, flags);
802
803 /*
804 * Clean up the internal mount structure and related entities. This
805 * may issue I/O.
806 */
807 if (error == 0) {
808 /* called with fs_token held */
809 hammer_free_hmp(mp);
810 } else {
811 lwkt_reltoken(&hmp->fs_token);
812 }
813 return(error);
814 }
815
816 /*
817 * Clean up the internal mount structure and disassociate it from the mount.
818 * This may issue I/O.
819 *
820 * Called with fs_token held.
821 */
822 static void
hammer_free_hmp(struct mount * mp)823 hammer_free_hmp(struct mount *mp)
824 {
825 hammer_mount_t hmp = (void *)mp->mnt_data;
826 hammer_flush_group_t flg;
827
828 /*
829 * Flush anything dirty. This won't even run if the
830 * filesystem errored-out.
831 */
832 hammer_flush_dirty(hmp, 30);
833
834 /*
835 * If the mount had a critical error we have to destroy any
836 * remaining inodes before we can finish cleaning up the flusher.
837 */
838 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
839 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
840 hammer_destroy_inode_callback, NULL);
841 }
842
843 /*
844 * There shouldn't be any inodes left now and any left over
845 * flush groups should now be empty.
846 */
847 KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
848 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
849 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
850 KKASSERT(RB_EMPTY(&flg->flush_tree));
851 if (flg->refs) {
852 hkprintf("Warning, flush_group %p was "
853 "not empty on umount!\n", flg);
854 }
855 kfree(flg, hmp->m_misc);
856 }
857
858 /*
859 * We can finally destroy the flusher
860 */
861 hammer_flusher_destroy(hmp);
862
863 /*
864 * We may have held recovered buffers due to a read-only mount.
865 * These must be discarded.
866 */
867 if (hmp->ronly)
868 hammer_recover_flush_buffers(hmp, NULL, -1);
869
870 /*
871 * Unload buffers and then volumes
872 */
873 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
874 hammer_unload_buffer, NULL);
875 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
876 hammer_unload_volume, NULL);
877
878 mp->mnt_data = NULL;
879 mp->mnt_flag &= ~MNT_LOCAL;
880 hmp->mp = NULL;
881 hammer_destroy_objid_cache(hmp);
882 kmalloc_destroy(&hmp->m_misc);
883 kmalloc_destroy(&hmp->m_inodes);
884 lwkt_reltoken(&hmp->fs_token);
885 kfree(hmp, M_HAMMER);
886 }
887
888 /*
889 * Report critical errors. ip may be NULL.
890 */
891 void
hammer_critical_error(hammer_mount_t hmp,hammer_inode_t ip,int error,const char * msg)892 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
893 int error, const char *msg)
894 {
895 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
896
897 hmkrateprintf(&hmp->krate, hmp,
898 "Critical error inode=%jd error=%d %s\n",
899 (intmax_t)(ip ? ip->obj_id : -1),
900 error, msg);
901
902 if (hmp->ronly == 0) {
903 hmp->ronly = 2; /* special errored read-only mode */
904 hmp->mp->mnt_flag |= MNT_RDONLY;
905 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
906 hammer_adjust_volume_mode, NULL);
907 hmkprintf(hmp, "Forcing read-only mode\n");
908 }
909 hmp->error = error;
910 if (hammer_debug_critical)
911 Debugger("Entering debugger");
912 }
913
914
915 /*
916 * Obtain a vnode for the specified inode number. An exclusively locked
917 * vnode is returned.
918 */
919 int
hammer_vfs_vget(struct mount * mp,struct vnode * dvp,ino_t ino,struct vnode ** vpp)920 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
921 ino_t ino, struct vnode **vpp)
922 {
923 struct hammer_transaction trans;
924 hammer_mount_t hmp = (void *)mp->mnt_data;
925 hammer_inode_t ip;
926 int error;
927 uint32_t localization;
928
929 lwkt_gettoken(&hmp->fs_token);
930 hammer_simple_transaction(&trans, hmp);
931
932 /*
933 * If a directory vnode is supplied (mainly NFS) then we can acquire
934 * the PFS domain from it. Otherwise we would only be able to vget
935 * inodes in the root PFS.
936 */
937 if (dvp) {
938 localization = HAMMER_DEF_LOCALIZATION |
939 VTOI(dvp)->obj_localization;
940 } else {
941 localization = HAMMER_DEF_LOCALIZATION;
942 }
943
944 /*
945 * Lookup the requested HAMMER inode. The structure must be
946 * left unlocked while we manipulate the related vnode to avoid
947 * a deadlock.
948 */
949 ip = hammer_get_inode(&trans, NULL, ino,
950 hmp->asof, localization,
951 0, &error);
952 if (ip == NULL) {
953 *vpp = NULL;
954 } else {
955 error = hammer_get_vnode(ip, vpp);
956 hammer_rel_inode(ip, 0);
957 }
958 hammer_done_transaction(&trans);
959 lwkt_reltoken(&hmp->fs_token);
960 return (error);
961 }
962
963 /*
964 * Return the root vnode for the filesystem.
965 *
966 * HAMMER stores the root vnode in the hammer_mount structure so
967 * getting it is easy.
968 */
969 static int
hammer_vfs_root(struct mount * mp,struct vnode ** vpp)970 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
971 {
972 int error;
973
974 error = hammer_vfs_vget(mp, NULL, HAMMER_OBJID_ROOT, vpp);
975 return (error);
976 }
977
978 static int
hammer_vfs_statfs(struct mount * mp,struct statfs * sbp,struct ucred * cred)979 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
980 {
981 hammer_mount_t hmp = (void *)mp->mnt_data;
982 hammer_volume_t volume;
983 hammer_volume_ondisk_t ondisk;
984 int error;
985 int64_t bfree;
986 int64_t breserved;
987
988 lwkt_gettoken(&hmp->fs_token);
989 volume = hammer_get_root_volume(hmp, &error);
990 if (error) {
991 lwkt_reltoken(&hmp->fs_token);
992 return(error);
993 }
994 ondisk = volume->ondisk;
995
996 /*
997 * Basic stats
998 */
999 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1000 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1001 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1002 hammer_rel_volume(volume, 0);
1003
1004 if (breserved > bfree)
1005 breserved = bfree;
1006 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1007 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1008 if (mp->mnt_stat.f_files < 0)
1009 mp->mnt_stat.f_files = 0;
1010
1011 *sbp = mp->mnt_stat;
1012 lwkt_reltoken(&hmp->fs_token);
1013 return(0);
1014 }
1015
1016 static int
hammer_vfs_statvfs(struct mount * mp,struct statvfs * sbp,struct ucred * cred)1017 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1018 {
1019 hammer_mount_t hmp = (void *)mp->mnt_data;
1020 hammer_volume_t volume;
1021 hammer_volume_ondisk_t ondisk;
1022 int error;
1023 int64_t bfree;
1024 int64_t breserved;
1025
1026 lwkt_gettoken(&hmp->fs_token);
1027 volume = hammer_get_root_volume(hmp, &error);
1028 if (error) {
1029 lwkt_reltoken(&hmp->fs_token);
1030 return(error);
1031 }
1032 ondisk = volume->ondisk;
1033
1034 /*
1035 * Basic stats
1036 */
1037 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1038 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1039 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_BIGBLOCK_SIZE;
1040 hammer_rel_volume(volume, 0);
1041
1042 if (breserved > bfree)
1043 breserved = bfree;
1044 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1045 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1046 if (mp->mnt_vstat.f_files < 0)
1047 mp->mnt_vstat.f_files = 0;
1048 *sbp = mp->mnt_vstat;
1049 lwkt_reltoken(&hmp->fs_token);
1050 return(0);
1051 }
1052
1053 /*
1054 * Sync the filesystem. Currently we have to run it twice, the second
1055 * one will advance the undo start index to the end index, so if a crash
1056 * occurs no undos will be run on mount.
1057 *
1058 * We do not sync the filesystem if we are called from a panic. If we did
1059 * we might end up blowing up a sync that was already in progress.
1060 */
1061 static int
hammer_vfs_sync(struct mount * mp,int waitfor)1062 hammer_vfs_sync(struct mount *mp, int waitfor)
1063 {
1064 hammer_mount_t hmp = (void *)mp->mnt_data;
1065 int error;
1066
1067 lwkt_gettoken(&hmp->fs_token);
1068 if (panicstr == NULL) {
1069 error = hammer_sync_hmp(hmp, waitfor);
1070 } else {
1071 error = EIO;
1072 }
1073 lwkt_reltoken(&hmp->fs_token);
1074 return (error);
1075 }
1076
1077 /*
1078 * Convert a vnode to a file handle.
1079 *
1080 * Accesses read-only fields on already-referenced structures so
1081 * no token is needed.
1082 */
1083 static int
hammer_vfs_vptofh(struct vnode * vp,struct fid * fhp)1084 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1085 {
1086 hammer_inode_t ip;
1087
1088 KKASSERT(MAXFIDSZ >= 16);
1089 ip = VTOI(vp);
1090 fhp->fid_len = offsetof(struct fid, fid_data[16]);
1091 fhp->fid_ext = lo_to_pfs(ip->obj_localization);
1092 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1093 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1094 return(0);
1095 }
1096
1097
1098 /*
1099 * Convert a file handle back to a vnode.
1100 *
1101 * Use rootvp to enforce PFS isolation when a PFS is exported via a
1102 * null mount.
1103 */
1104 static int
hammer_vfs_fhtovp(struct mount * mp,struct vnode * rootvp,struct fid * fhp,struct vnode ** vpp)1105 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1106 struct fid *fhp, struct vnode **vpp)
1107 {
1108 hammer_mount_t hmp = (void *)mp->mnt_data;
1109 struct hammer_transaction trans;
1110 hammer_inode_t ip;
1111 struct hammer_inode_info info;
1112 int error;
1113 uint32_t localization;
1114
1115 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1116 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1117 if (rootvp)
1118 localization = VTOI(rootvp)->obj_localization;
1119 else
1120 localization = pfs_to_lo(fhp->fid_ext);
1121
1122 lwkt_gettoken(&hmp->fs_token);
1123 hammer_simple_transaction(&trans, hmp);
1124
1125 /*
1126 * Get/allocate the hammer_inode structure. The structure must be
1127 * unlocked while we manipulate the related vnode to avoid a
1128 * deadlock.
1129 */
1130 ip = hammer_get_inode(&trans, NULL, info.obj_id,
1131 info.obj_asof, localization, 0, &error);
1132 if (ip) {
1133 error = hammer_get_vnode(ip, vpp);
1134 hammer_rel_inode(ip, 0);
1135 } else {
1136 *vpp = NULL;
1137 }
1138 hammer_done_transaction(&trans);
1139 lwkt_reltoken(&hmp->fs_token);
1140 return (error);
1141 }
1142
1143 static int
hammer_vfs_checkexp(struct mount * mp,struct sockaddr * nam,int * exflagsp,struct ucred ** credanonp)1144 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1145 int *exflagsp, struct ucred **credanonp)
1146 {
1147 hammer_mount_t hmp = (void *)mp->mnt_data;
1148 struct netcred *np;
1149 int error;
1150
1151 lwkt_gettoken(&hmp->fs_token);
1152 np = vfs_export_lookup(mp, &hmp->export, nam);
1153 if (np) {
1154 *exflagsp = np->netc_exflags;
1155 *credanonp = &np->netc_anon;
1156 error = 0;
1157 } else {
1158 error = EACCES;
1159 }
1160 lwkt_reltoken(&hmp->fs_token);
1161 return (error);
1162
1163 }
1164
1165 int
hammer_vfs_export(struct mount * mp,int op,const struct export_args * export)1166 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1167 {
1168 hammer_mount_t hmp = (void *)mp->mnt_data;
1169 int error;
1170
1171 lwkt_gettoken(&hmp->fs_token);
1172
1173 switch(op) {
1174 case MOUNTCTL_SET_EXPORT:
1175 error = vfs_export(mp, &hmp->export, export);
1176 break;
1177 default:
1178 error = EOPNOTSUPP;
1179 break;
1180 }
1181 lwkt_reltoken(&hmp->fs_token);
1182
1183 return(error);
1184 }
1185
1186