2 * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/vnode.h>
41 #include <sys/mount.h>
42 #include <sys/malloc.h>
43 #include <sys/nlookup.h>
44 #include <sys/fcntl.h>
45 #include <sys/sysctl.h>
50 int hammer_supported_version = HAMMER_VOL_VERSION_TWO;
52 int hammer_debug_general;
53 int hammer_debug_debug = 1; /* medium-error panics */
54 int hammer_debug_inode;
55 int hammer_debug_locks;
56 int hammer_debug_btree;
58 int hammer_debug_recover; /* -1 will disable, +1 will force */
59 int hammer_debug_recover_faults;
60 int hammer_cluster_enable = 1; /* enable read clustering by default */
61 int hammer_count_fsyncs;
62 int hammer_count_inodes;
63 int hammer_count_iqueued;
64 int hammer_count_reclaiming;
65 int hammer_count_records;
66 int hammer_count_record_datas;
67 int hammer_count_volumes;
68 int hammer_count_buffers;
69 int hammer_count_nodes;
70 int64_t hammer_count_extra_space_used;
71 int64_t hammer_stats_btree_lookups;
72 int64_t hammer_stats_btree_searches;
73 int64_t hammer_stats_btree_inserts;
74 int64_t hammer_stats_btree_deletes;
75 int64_t hammer_stats_btree_elements;
76 int64_t hammer_stats_btree_splits;
77 int64_t hammer_stats_btree_iterations;
78 int64_t hammer_stats_btree_root_iterations;
79 int64_t hammer_stats_record_iterations;
81 int64_t hammer_stats_file_read;
82 int64_t hammer_stats_file_write;
83 int64_t hammer_stats_file_iopsr;
84 int64_t hammer_stats_file_iopsw;
85 int64_t hammer_stats_disk_read;
86 int64_t hammer_stats_disk_write;
87 int64_t hammer_stats_inode_flushes;
88 int64_t hammer_stats_commits;
90 int hammer_count_dirtybufspace; /* global */
91 int hammer_count_refedbufs; /* global */
92 int hammer_count_reservations;
93 int hammer_count_io_running_read;
94 int hammer_count_io_running_write;
95 int hammer_count_io_locked;
96 int hammer_limit_dirtybufspace; /* per-mount */
97 int hammer_limit_recs; /* as a whole XXX */
98 int hammer_autoflush = 2000; /* auto flush */
100 int hammer_verify_zone;
101 int hammer_verify_data = 1;
102 int hammer_write_mode;
103 int64_t hammer_contention_count;
104 int64_t hammer_zone_limit;
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_debug, CTLFLAG_RW,
114 &hammer_debug_debug, 0, "");
115 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
116 &hammer_debug_inode, 0, "");
117 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
118 &hammer_debug_locks, 0, "");
119 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
120 &hammer_debug_btree, 0, "");
121 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
122 &hammer_debug_tid, 0, "");
123 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
124 &hammer_debug_recover, 0, "");
125 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
126 &hammer_debug_recover_faults, 0, "");
127 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
128 &hammer_cluster_enable, 0, "");
130 SYSCTL_INT(_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, "");
135 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
136 &hammer_count_fsyncs, 0, "");
137 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
138 &hammer_count_inodes, 0, "");
139 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
140 &hammer_count_iqueued, 0, "");
141 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
142 &hammer_count_reclaiming, 0, "");
143 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
144 &hammer_count_records, 0, "");
145 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
146 &hammer_count_record_datas, 0, "");
147 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
148 &hammer_count_volumes, 0, "");
149 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
150 &hammer_count_buffers, 0, "");
151 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
152 &hammer_count_nodes, 0, "");
153 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
154 &hammer_count_extra_space_used, 0, "");
156 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
157 &hammer_stats_btree_searches, 0, "");
158 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
159 &hammer_stats_btree_lookups, 0, "");
160 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
161 &hammer_stats_btree_inserts, 0, "");
162 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
163 &hammer_stats_btree_deletes, 0, "");
164 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
165 &hammer_stats_btree_elements, 0, "");
166 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
167 &hammer_stats_btree_splits, 0, "");
168 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
169 &hammer_stats_btree_iterations, 0, "");
170 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
171 &hammer_stats_btree_root_iterations, 0, "");
172 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
173 &hammer_stats_record_iterations, 0, "");
175 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
176 &hammer_stats_file_read, 0, "");
177 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
178 &hammer_stats_file_write, 0, "");
179 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
180 &hammer_stats_file_iopsr, 0, "");
181 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
182 &hammer_stats_file_iopsw, 0, "");
183 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
184 &hammer_stats_disk_read, 0, "");
185 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
186 &hammer_stats_disk_write, 0, "");
187 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
188 &hammer_stats_inode_flushes, 0, "");
189 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
190 &hammer_stats_commits, 0, "");
192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
193 &hammer_count_dirtybufspace, 0, "");
194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
195 &hammer_count_refedbufs, 0, "");
196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
197 &hammer_count_reservations, 0, "");
198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
199 &hammer_count_io_running_read, 0, "");
200 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
201 &hammer_count_io_locked, 0, "");
202 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
203 &hammer_count_io_running_write, 0, "");
204 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
205 &hammer_zone_limit, 0, "");
206 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
207 &hammer_contention_count, 0, "");
208 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
209 &hammer_autoflush, 0, "");
210 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
211 &hammer_verify_zone, 0, "");
212 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
213 &hammer_verify_data, 0, "");
214 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
215 &hammer_write_mode, 0, "");
217 KTR_INFO_MASTER(hammer);
222 static void hammer_free_hmp(struct mount *mp);
224 static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
226 static int hammer_vfs_unmount(struct mount *mp, int mntflags);
227 static int hammer_vfs_root(struct mount *mp, struct vnode **vpp);
228 static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
230 static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
232 static int hammer_vfs_sync(struct mount *mp, int waitfor);
233 static int hammer_vfs_vget(struct mount *mp, ino_t ino,
235 static int hammer_vfs_init(struct vfsconf *conf);
236 static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
237 struct fid *fhp, struct vnode **vpp);
238 static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
239 static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
240 int *exflagsp, struct ucred **credanonp);
243 static struct vfsops hammer_vfsops = {
244 .vfs_mount = hammer_vfs_mount,
245 .vfs_unmount = hammer_vfs_unmount,
246 .vfs_root = hammer_vfs_root,
247 .vfs_statfs = hammer_vfs_statfs,
248 .vfs_statvfs = hammer_vfs_statvfs,
249 .vfs_sync = hammer_vfs_sync,
250 .vfs_vget = hammer_vfs_vget,
251 .vfs_init = hammer_vfs_init,
252 .vfs_vptofh = hammer_vfs_vptofh,
253 .vfs_fhtovp = hammer_vfs_fhtovp,
254 .vfs_checkexp = hammer_vfs_checkexp
257 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
259 VFS_SET(hammer_vfsops, hammer, 0);
260 MODULE_VERSION(hammer, 1);
263 hammer_vfs_init(struct vfsconf *conf)
267 if (hammer_limit_recs == 0) {
268 hammer_limit_recs = nbuf * 25;
269 n = kmalloc_limit(M_HAMMER) / 512;
270 if (hammer_limit_recs > n)
271 hammer_limit_recs = n;
273 if (hammer_limit_dirtybufspace == 0) {
274 hammer_limit_dirtybufspace = hidirtybufspace / 2;
275 if (hammer_limit_dirtybufspace < 100)
276 hammer_limit_dirtybufspace = 100;
282 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
285 struct hammer_mount_info info;
287 hammer_volume_t rootvol;
288 struct vnode *rootvp;
289 struct vnode *devvp = NULL;
290 const char *upath; /* volume name in userspace */
291 char *path; /* volume name in system space */
298 * Accept hammer_mount_info. mntpt is NULL for root mounts at boot.
301 if ((error = bdevvp(rootdev, &devvp))) {
302 kprintf("hammer_mountroot: can't find devvp\n");
305 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
306 bzero(&info, sizeof(info));
311 if ((error = copyin(data, &info, sizeof(info))) != 0)
316 * updating or new mount
318 if (mp->mnt_flag & MNT_UPDATE) {
319 hmp = (void *)mp->mnt_data;
320 KKASSERT(hmp != NULL);
322 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
328 * master-id validation. The master id may not be changed by a
331 if (info.hflags & HMNT_MASTERID) {
332 if (hmp && hmp->master_id != info.master_id) {
333 kprintf("hammer: cannot change master id "
334 "with mount update\n");
337 master_id = info.master_id;
338 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
342 master_id = hmp->master_id;
348 * Interal mount data structure
351 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
352 mp->mnt_data = (qaddr_t)hmp;
354 /*TAILQ_INIT(&hmp->recycle_list);*/
357 * Make sure kmalloc type limits are set appropriately. If root
358 * increases the vnode limit you may have to do a dummy remount
359 * to adjust the HAMMER inode limit.
361 kmalloc_create(&hmp->m_misc, "HAMMER-others");
362 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
364 maxinodes = desiredvnodes + desiredvnodes / 5 +
366 kmalloc_raise_limit(hmp->m_inodes,
367 maxinodes * sizeof(struct hammer_inode));
369 hmp->root_btree_beg.localization = 0x00000000U;
370 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
371 hmp->root_btree_beg.key = -0x8000000000000000LL;
372 hmp->root_btree_beg.create_tid = 1;
373 hmp->root_btree_beg.delete_tid = 1;
374 hmp->root_btree_beg.rec_type = 0;
375 hmp->root_btree_beg.obj_type = 0;
377 hmp->root_btree_end.localization = 0xFFFFFFFFU;
378 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
379 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
380 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
381 hmp->root_btree_end.delete_tid = 0; /* special case */
382 hmp->root_btree_end.rec_type = 0xFFFFU;
383 hmp->root_btree_end.obj_type = 0;
385 hmp->krate.freq = 1; /* maximum reporting rate (hz) */
386 hmp->krate.count = -16; /* initial burst */
388 hmp->sync_lock.refs = 1;
389 hmp->free_lock.refs = 1;
390 hmp->undo_lock.refs = 1;
391 hmp->blkmap_lock.refs = 1;
393 TAILQ_INIT(&hmp->delay_list);
394 TAILQ_INIT(&hmp->flush_group_list);
395 TAILQ_INIT(&hmp->objid_cache_list);
396 TAILQ_INIT(&hmp->undo_lru_list);
397 TAILQ_INIT(&hmp->reclaim_list);
399 hmp->hflags &= ~HMNT_USERFLAGS;
400 hmp->hflags |= info.hflags & HMNT_USERFLAGS;
402 hmp->master_id = master_id;
405 mp->mnt_flag |= MNT_RDONLY;
406 hmp->asof = info.asof;
408 hmp->asof = HAMMER_MAX_TID;
412 * Re-open read-write if originally read-only, or vise-versa.
414 if (mp->mnt_flag & MNT_UPDATE) {
416 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
417 kprintf("HAMMER read-only -> read-write\n");
419 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
420 hammer_adjust_volume_mode, NULL);
421 rootvol = hammer_get_root_volume(hmp, &error);
423 hammer_recover_flush_buffers(hmp, rootvol, 1);
424 bcopy(rootvol->ondisk->vol0_blockmap,
426 sizeof(hmp->blockmap));
427 hammer_rel_volume(rootvol, 0);
429 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
430 hammer_reload_inode, NULL);
431 /* kernel clears MNT_RDONLY */
432 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
433 kprintf("HAMMER read-write -> read-only\n");
434 hmp->ronly = 1; /* messy */
435 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
436 hammer_reload_inode, NULL);
438 hammer_flusher_sync(hmp);
439 hammer_flusher_sync(hmp);
440 hammer_flusher_sync(hmp);
442 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
443 hammer_adjust_volume_mode, NULL);
448 RB_INIT(&hmp->rb_vols_root);
449 RB_INIT(&hmp->rb_inos_root);
450 RB_INIT(&hmp->rb_nods_root);
451 RB_INIT(&hmp->rb_undo_root);
452 RB_INIT(&hmp->rb_resv_root);
453 RB_INIT(&hmp->rb_bufs_root);
454 RB_INIT(&hmp->rb_pfsm_root);
456 hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
458 TAILQ_INIT(&hmp->volu_list);
459 TAILQ_INIT(&hmp->undo_list);
460 TAILQ_INIT(&hmp->data_list);
461 TAILQ_INIT(&hmp->meta_list);
462 TAILQ_INIT(&hmp->lose_list);
467 path = objcache_get(namei_oc, M_WAITOK);
469 for (i = 0; i < info.nvolumes; ++i) {
473 * Only one volume; and no need for copyin.
475 KKASSERT(info.nvolumes == 1);
476 ksnprintf(path, MAXPATHLEN, "/dev/%s",
477 mp->mnt_stat.f_mntfromname);
480 error = copyin(&info.volumes[i], &upath,
483 error = copyinstr(upath, path,
487 error = hammer_install_volume(hmp, path, devvp);
491 objcache_put(namei_oc, path);
494 * Make sure we found a root volume
496 if (error == 0 && hmp->rootvol == NULL) {
497 kprintf("hammer_mount: No root volume found!\n");
502 * Check that all required volumes are available
504 if (error == 0 && hammer_mountcheck_volumes(hmp)) {
505 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
515 * No errors, setup enough of the mount point so we can lookup the
518 mp->mnt_iosize_max = MAXPHYS;
519 mp->mnt_kern_flag |= MNTK_FSMID;
522 * note: f_iosize is used by vnode_pager_haspage() when constructing
525 mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
526 mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
528 mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
529 mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
531 mp->mnt_maxsymlinklen = 255;
532 mp->mnt_flag |= MNT_LOCAL;
534 vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
535 vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
536 vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
539 * The root volume's ondisk pointer is only valid if we hold a
542 rootvol = hammer_get_root_volume(hmp, &error);
547 * Perform any necessary UNDO operations. The recovery code does
548 * call hammer_undo_lookup() so we have to pre-cache the blockmap,
549 * and then re-copy it again after recovery is complete.
551 * If this is a read-only mount the UNDO information is retained
552 * in memory in the form of dirty buffer cache buffers, and not
553 * written back to the media.
555 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
556 sizeof(hmp->blockmap));
559 * Check filesystem version
561 hmp->version = rootvol->ondisk->vol_version;
562 if (hmp->version < HAMMER_VOL_VERSION_MIN ||
563 hmp->version > HAMMER_VOL_VERSION_MAX) {
564 kprintf("HAMMER: mount unsupported fs version %d\n",
571 * The undo_rec_limit limits the size of flush groups to avoid
572 * blowing out the UNDO FIFO. This calculation is typically in
573 * the tens of thousands and is designed primarily when small
574 * HAMMER filesystems are created.
576 hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
577 if (hammer_debug_general & 0x0001)
578 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
580 error = hammer_recover(hmp, rootvol);
582 kprintf("Failed to recover HAMMER filesystem on mount\n");
587 * Finish setup now that we have a good root volume.
589 * The top 16 bits of fsid.val[1] is a pfs id.
591 ksnprintf(mp->mnt_stat.f_mntfromname,
592 sizeof(mp->mnt_stat.f_mntfromname), "%s",
593 rootvol->ondisk->vol_name);
594 mp->mnt_stat.f_fsid.val[0] =
595 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
596 mp->mnt_stat.f_fsid.val[1] =
597 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
598 mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
600 mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
601 mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
602 sizeof(mp->mnt_vstat.f_fsid_uuid));
605 * Certain often-modified fields in the root volume are cached in
606 * the hammer_mount structure so we do not have to generate lots
607 * of little UNDO structures for them.
609 * Recopy after recovery. This also has the side effect of
610 * setting our cached undo FIFO's first_offset, which serves to
611 * placemark the FIFO start for the NEXT flush cycle while the
612 * on-disk first_offset represents the LAST flush cycle.
614 hmp->next_tid = rootvol->ondisk->vol0_next_tid;
615 hmp->flush_tid1 = hmp->next_tid;
616 hmp->flush_tid2 = hmp->next_tid;
617 bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
618 sizeof(hmp->blockmap));
619 hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
621 hammer_flusher_create(hmp);
624 * Locate the root directory using the root cluster's B-Tree as a
625 * starting point. The root directory uses an obj_id of 1.
627 * FUTURE: Leave the root directory cached referenced but unlocked
628 * in hmp->rootvp (need to flush it on unmount).
630 error = hammer_vfs_vget(mp, 1, &rootvp);
634 /*vn_unlock(hmp->rootvp);*/
637 hammer_rel_volume(rootvol, 0);
640 * Cleanup and return.
648 hammer_vfs_unmount(struct mount *mp, int mntflags)
651 struct hammer_mount *hmp = (void *)mp->mnt_data;
657 * Clean out the vnodes
660 if (mntflags & MNT_FORCE)
662 if ((error = vflush(mp, 0, flags)) != 0)
666 * Clean up the internal mount structure and related entities. This
674 * Clean up the internal mount structure and disassociate it from the mount.
675 * This may issue I/O.
678 hammer_free_hmp(struct mount *mp)
680 struct hammer_mount *hmp = (void *)mp->mnt_data;
681 hammer_flush_group_t flg;
686 * Flush anything dirty. This won't even run if the
687 * filesystem errored-out.
690 while (hammer_flusher_haswork(hmp)) {
691 hammer_flusher_sync(hmp);
695 kprintf("HAMMER: umount flushing.");
698 tsleep(&dummy, 0, "hmrufl", hz);
701 kprintf("giving up\n");
705 if (count >= 5 && count < 30)
709 * If the mount had a critical error we have to destroy any
710 * remaining inodes before we can finish cleaning up the flusher.
712 if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
713 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
714 hammer_destroy_inode_callback, NULL);
718 * There shouldn't be any inodes left now and any left over
719 * flush groups should now be empty.
721 KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
722 while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
723 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
724 KKASSERT(TAILQ_EMPTY(&flg->flush_list));
726 kprintf("HAMMER: Warning, flush_group %p was "
727 "not empty on umount!\n", flg);
729 kfree(flg, hmp->m_misc);
733 * We can finally destroy the flusher
735 hammer_flusher_destroy(hmp);
738 * We may have held recovered buffers due to a read-only mount.
739 * These must be discarded.
742 hammer_recover_flush_buffers(hmp, NULL, -1);
745 * Unload buffers and then volumes
747 RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
748 hammer_unload_buffer, NULL);
749 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
750 hammer_unload_volume, NULL);
753 mp->mnt_flag &= ~MNT_LOCAL;
755 hammer_destroy_objid_cache(hmp);
756 kmalloc_destroy(&hmp->m_misc);
757 kmalloc_destroy(&hmp->m_inodes);
758 kfree(hmp, M_HAMMER);
762 * Report critical errors. ip may be NULL.
765 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
766 int error, const char *msg)
768 hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
769 krateprintf(&hmp->krate,
770 "HAMMER(%s): Critical error inode=%lld %s\n",
771 hmp->mp->mnt_stat.f_mntfromname,
772 (long long)(ip ? ip->obj_id : -1), msg);
773 if (hmp->ronly == 0) {
774 hmp->ronly = 2; /* special errored read-only mode */
775 hmp->mp->mnt_flag |= MNT_RDONLY;
776 kprintf("HAMMER(%s): Forcing read-only mode\n",
777 hmp->mp->mnt_stat.f_mntfromname);
784 * Obtain a vnode for the specified inode number. An exclusively locked
788 hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
790 struct hammer_transaction trans;
791 struct hammer_mount *hmp = (void *)mp->mnt_data;
792 struct hammer_inode *ip;
795 hammer_simple_transaction(&trans, hmp);
798 * Lookup the requested HAMMER inode. The structure must be
799 * left unlocked while we manipulate the related vnode to avoid
802 ip = hammer_get_inode(&trans, NULL, ino,
803 hmp->asof, HAMMER_DEF_LOCALIZATION,
807 hammer_done_transaction(&trans);
810 error = hammer_get_vnode(ip, vpp);
811 hammer_rel_inode(ip, 0);
812 hammer_done_transaction(&trans);
817 * Return the root vnode for the filesystem.
819 * HAMMER stores the root vnode in the hammer_mount structure so
820 * getting it is easy.
823 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
826 struct hammer_mount *hmp = (void *)mp->mnt_data;
830 error = hammer_vfs_vget(mp, 1, vpp);
835 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
837 struct hammer_mount *hmp = (void *)mp->mnt_data;
838 hammer_volume_t volume;
839 hammer_volume_ondisk_t ondisk;
844 volume = hammer_get_root_volume(hmp, &error);
847 ondisk = volume->ondisk;
852 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
853 mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
854 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
855 hammer_rel_volume(volume, 0);
857 mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
858 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
859 if (mp->mnt_stat.f_files < 0)
860 mp->mnt_stat.f_files = 0;
867 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
869 struct hammer_mount *hmp = (void *)mp->mnt_data;
870 hammer_volume_t volume;
871 hammer_volume_ondisk_t ondisk;
876 volume = hammer_get_root_volume(hmp, &error);
879 ondisk = volume->ondisk;
884 _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
885 mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
886 bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
887 hammer_rel_volume(volume, 0);
889 mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
890 mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;
891 if (mp->mnt_vstat.f_files < 0)
892 mp->mnt_vstat.f_files = 0;
893 *sbp = mp->mnt_vstat;
898 * Sync the filesystem. Currently we have to run it twice, the second
899 * one will advance the undo start index to the end index, so if a crash
900 * occurs no undos will be run on mount.
902 * We do not sync the filesystem if we are called from a panic. If we did
903 * we might end up blowing up a sync that was already in progress.
906 hammer_vfs_sync(struct mount *mp, int waitfor)
908 struct hammer_mount *hmp = (void *)mp->mnt_data;
911 if (panicstr == NULL) {
912 error = hammer_sync_hmp(hmp, waitfor);
920 * Convert a vnode to a file handle.
923 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
927 KKASSERT(MAXFIDSZ >= 16);
929 fhp->fid_len = offsetof(struct fid, fid_data[16]);
930 fhp->fid_ext = ip->obj_localization >> 16;
931 bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
932 bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
938 * Convert a file handle back to a vnode.
940 * Use rootvp to enforce PFS isolation when a PFS is exported via a
944 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
945 struct fid *fhp, struct vnode **vpp)
947 struct hammer_transaction trans;
948 struct hammer_inode *ip;
949 struct hammer_inode_info info;
951 u_int32_t localization;
953 bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
954 bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
956 localization = VTOI(rootvp)->obj_localization;
958 localization = (u_int32_t)fhp->fid_ext << 16;
960 hammer_simple_transaction(&trans, (void *)mp->mnt_data);
963 * Get/allocate the hammer_inode structure. The structure must be
964 * unlocked while we manipulate the related vnode to avoid a
967 ip = hammer_get_inode(&trans, NULL, info.obj_id,
968 info.obj_asof, localization, 0, &error);
973 error = hammer_get_vnode(ip, vpp);
974 hammer_rel_inode(ip, 0);
975 hammer_done_transaction(&trans);
980 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
981 int *exflagsp, struct ucred **credanonp)
983 hammer_mount_t hmp = (void *)mp->mnt_data;
987 np = vfs_export_lookup(mp, &hmp->export, nam);
989 *exflagsp = np->netc_exflags;
990 *credanonp = &np->netc_anon;
1000 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1002 hammer_mount_t hmp = (void *)mp->mnt_data;
1006 case MOUNTCTL_SET_EXPORT:
1007 error = vfs_export(mp, &hmp->export, export);