2 * Copyright (c) 2011, 2012 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 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/nlookup.h>
38 #include <sys/vnode.h>
39 #include <sys/mount.h>
40 #include <sys/fcntl.h>
43 #include <sys/vfsops.h>
44 #include <sys/sysctl.h>
47 #include "hammer2_disk.h"
48 #include "hammer2_mount.h"
50 struct hammer2_sync_info {
55 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
56 static struct hammer2_mntlist hammer2_mntlist;
57 static struct lock hammer2_mntlk;
60 int hammer2_cluster_enable = 1;
61 int hammer2_hardlink_enable = 1;
62 long hammer2_iod_file_read;
63 long hammer2_iod_meta_read;
64 long hammer2_iod_indr_read;
65 long hammer2_iod_file_write;
66 long hammer2_iod_meta_write;
67 long hammer2_iod_indr_write;
68 long hammer2_iod_volu_write;
69 long hammer2_ioa_file_read;
70 long hammer2_ioa_meta_read;
71 long hammer2_ioa_indr_read;
72 long hammer2_ioa_file_write;
73 long hammer2_ioa_meta_write;
74 long hammer2_ioa_indr_write;
75 long hammer2_ioa_volu_write;
77 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
79 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
80 &hammer2_debug, 0, "");
81 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
82 &hammer2_cluster_enable, 0, "");
83 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
84 &hammer2_hardlink_enable, 0, "");
85 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
86 &hammer2_iod_file_read, 0, "");
87 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
88 &hammer2_iod_meta_read, 0, "");
89 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
90 &hammer2_iod_indr_read, 0, "");
91 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
92 &hammer2_iod_file_write, 0, "");
93 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
94 &hammer2_iod_meta_write, 0, "");
95 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
96 &hammer2_iod_indr_write, 0, "");
97 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
98 &hammer2_iod_volu_write, 0, "");
99 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
100 &hammer2_ioa_file_read, 0, "");
101 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
102 &hammer2_ioa_meta_read, 0, "");
103 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
104 &hammer2_ioa_indr_read, 0, "");
105 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
106 &hammer2_ioa_file_write, 0, "");
107 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
108 &hammer2_ioa_meta_write, 0, "");
109 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
110 &hammer2_ioa_indr_write, 0, "");
111 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
112 &hammer2_ioa_volu_write, 0, "");
114 static int hammer2_vfs_init(struct vfsconf *conf);
115 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
117 static int hammer2_remount(struct mount *, char *, struct vnode *,
119 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
120 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
121 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
123 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
125 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
126 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
127 ino_t ino, struct vnode **vpp);
128 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
129 struct fid *fhp, struct vnode **vpp);
130 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
131 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
132 int *exflagsp, struct ucred **credanonp);
134 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
135 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
136 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
139 * HAMMER2 vfs operations.
141 static struct vfsops hammer2_vfsops = {
142 .vfs_init = hammer2_vfs_init,
143 .vfs_sync = hammer2_vfs_sync,
144 .vfs_mount = hammer2_vfs_mount,
145 .vfs_unmount = hammer2_vfs_unmount,
146 .vfs_root = hammer2_vfs_root,
147 .vfs_statfs = hammer2_vfs_statfs,
148 .vfs_statvfs = hammer2_vfs_statvfs,
149 .vfs_vget = hammer2_vfs_vget,
150 .vfs_vptofh = hammer2_vfs_vptofh,
151 .vfs_fhtovp = hammer2_vfs_fhtovp,
152 .vfs_checkexp = hammer2_vfs_checkexp
155 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
157 VFS_SET(hammer2_vfsops, hammer2, 0);
158 MODULE_VERSION(hammer2, 1);
162 hammer2_vfs_init(struct vfsconf *conf)
168 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
170 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
172 if (HAMMER2_ALLOCREF_BYTES != sizeof(struct hammer2_allocref))
174 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
178 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
180 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
181 TAILQ_INIT(&hammer2_mntlist);
187 * Mount or remount HAMMER2 fileystem from physical media
190 * mp mount point structure
196 * mp mount point structure
197 * path path to mount point
198 * data pointer to argument structure in user space
199 * volume volume path (device@LABEL form)
200 * hflags user mount flags
201 * cred user credentials
208 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
211 struct hammer2_mount_info info;
212 hammer2_pfsmount_t *pmp;
213 hammer2_mount_t *hmp;
216 struct nlookupdata nd;
217 hammer2_chain_t *parent;
218 hammer2_chain_t *schain;
219 hammer2_chain_t *rchain;
220 char devstr[MNAMELEN];
235 kprintf("hammer2_mount\n");
244 * Non-root mount or updating a mount
246 error = copyin(data, &info, sizeof(info));
250 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
254 /* Extract device and label */
256 label = strchr(devstr, '@');
258 ((label + 1) - dev) > done) {
266 if (mp->mnt_flag & MNT_UPDATE) {
268 /* HAMMER2 implements NFS export via mountctl */
271 error = hammer2_remount(mp, path, devvp, cred);
279 /* Lookup name and verify it refers to a block device */
280 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
282 error = nlookup(&nd);
284 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
288 if (vn_isdisk(devvp, &error))
289 error = vfs_mountedon(devvp);
293 * Determine if the device has already been mounted. After this
294 * check hmp will be non-NULL if we are doing the second or more
295 * hammer2 mounts from the same device.
297 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
298 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
299 if (hmp->devvp == devvp)
304 * Open the device if this isn't a secondary mount
310 if (error == 0 && vcount(devvp) > 0)
314 * Now open the device
317 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
318 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
319 error = vinvalbuf(devvp, V_SAVE, 0, 0);
321 error = VOP_OPEN(devvp,
322 ronly ? FREAD : FREAD | FWRITE,
327 if (error && devvp) {
332 lockmgr(&hammer2_mntlk, LK_RELEASE);
338 * Block device opened successfully, finish initializing the
341 * From this point on we have to call hammer2_unmount() on failure.
343 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
344 mp->mnt_data = (qaddr_t)pmp;
348 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
351 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
352 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
353 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
355 ccms_domain_init(&pmp->ccms_dom);
358 lockmgr(&hammer2_mntlk, LK_RELEASE);
359 kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
361 mp->mnt_flag = MNT_LOCAL;
362 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
366 * vchain setup. vchain.data is special cased to NULL.
367 * vchain.refs is initialized and will never drop to 0.
369 hmp->vchain.refs = 1;
370 hmp->vchain.data = (void *)&hmp->voldata;
371 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
372 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
373 hmp->vchain.bref_flush = hmp->vchain.bref;
374 ccms_cst_init(&hmp->vchain.cst, NULL);
375 /* hmp->vchain.u.xxx is left NULL */
376 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
377 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
380 * Install the volume header
382 error = hammer2_install_volume_header(hmp);
384 hammer2_vfs_unmount(mp, MNT_FORCE);
390 * required mount structure initializations
392 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
393 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
395 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
396 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
401 mp->mnt_iosize_max = MAXPHYS;
404 * First locate the super-root inode, which is key 0 relative to the
405 * volume header's blockset.
407 * Then locate the root inode by scanning the directory keyspace
408 * represented by the label.
411 parent = &hmp->vchain;
412 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
413 schain = hammer2_chain_lookup(hmp, &parent,
414 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
415 hammer2_chain_unlock(hmp, parent);
416 if (schain == NULL) {
417 kprintf("hammer2_mount: invalid super-root\n");
418 hammer2_vfs_unmount(mp, MNT_FORCE);
421 hammer2_chain_ref(hmp, schain); /* for hmp->schain */
422 hmp->schain = schain; /* left locked */
424 schain = hmp->schain;
425 hammer2_chain_lock(hmp, schain, HAMMER2_RESOLVE_ALWAYS);
429 lhc = hammer2_dirhash(label, strlen(label));
430 rchain = hammer2_chain_lookup(hmp, &parent,
431 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
434 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
436 strcmp(label, rchain->data->ipdata.filename) == 0) {
439 rchain = hammer2_chain_next(hmp, &parent, rchain,
440 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
443 hammer2_chain_unlock(hmp, parent);
444 if (rchain == NULL) {
445 kprintf("hammer2_mount: PFS label not found\n");
446 hammer2_vfs_unmount(mp, MNT_FORCE);
449 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
450 hammer2_chain_unlock(hmp, rchain);
451 kprintf("hammer2_mount: PFS label already mounted!\n");
452 hammer2_vfs_unmount(mp, MNT_FORCE);
455 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
457 hammer2_chain_ref(hmp, rchain); /* for pmp->rchain */
458 hammer2_chain_unlock(hmp, rchain);
459 pmp->rchain = rchain; /* left held & unlocked */
460 pmp->iroot = rchain->u.ip; /* implied hold from rchain */
461 pmp->iroot->pmp = pmp;
463 kprintf("iroot %p\n", pmp->iroot);
466 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
467 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
468 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
470 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
471 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
472 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
473 copyinstr(path, mp->mnt_stat.f_mntonname,
474 sizeof(mp->mnt_stat.f_mntonname) - 1,
477 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
484 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
492 hammer2_vfs_unmount(struct mount *mp, int mntflags)
494 hammer2_pfsmount_t *pmp;
495 hammer2_mount_t *hmp;
498 int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
505 if (mntflags & MNT_FORCE)
508 hammer2_mount_exlock(hmp);
511 * If mount initialization proceeded far enough we must flush
515 error = vflush(mp, 0, flags);
520 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
522 kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
525 * Flush any left over chains. The voldata lock is only used
526 * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
528 hammer2_voldata_lock(hmp);
529 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
530 HAMMER2_CHAIN_MODIFIED_AUX |
531 HAMMER2_CHAIN_SUBMODIFIED)) {
532 hammer2_voldata_unlock(hmp);
533 hammer2_vfs_sync(mp, MNT_WAIT);
535 hammer2_voldata_unlock(hmp);
537 if (hmp->pmp_count == 0) {
538 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
539 HAMMER2_CHAIN_MODIFIED_AUX |
540 HAMMER2_CHAIN_SUBMODIFIED)) {
541 kprintf("hammer2_unmount: chains left over after "
543 if (hammer2_debug & 0x0010)
544 Debugger("entered debugger");
549 * Cleanup the root and super-root chain elements (which should be
554 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
555 KKASSERT(pmp->rchain->refs == 1);
556 hammer2_chain_drop(hmp, pmp->rchain);
559 ccms_domain_uninit(&pmp->ccms_dom);
560 if (hmp->pmp_count == 0) {
562 KKASSERT(hmp->schain->refs == 1);
563 hammer2_chain_drop(hmp, hmp->schain);
568 * Finish up with the device vnode
570 if ((devvp = hmp->devvp) != NULL) {
571 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
573 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
578 hammer2_mount_unlock(hmp);
584 kfree(pmp, M_HAMMER2);
585 if (hmp->pmp_count == 0) {
586 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
587 kmalloc_destroy(&hmp->minode);
588 kmalloc_destroy(&hmp->mchain);
589 kfree(hmp, M_HAMMER2);
591 lockmgr(&hammer2_mntlk, LK_RELEASE);
597 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
598 ino_t ino, struct vnode **vpp)
600 kprintf("hammer2_vget\n");
606 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
608 hammer2_pfsmount_t *pmp;
609 hammer2_mount_t *hmp;
615 hammer2_mount_exlock(hmp);
616 if (pmp->iroot == NULL) {
620 hammer2_chain_lock(hmp, &pmp->iroot->chain,
621 HAMMER2_RESOLVE_ALWAYS |
622 HAMMER2_RESOLVE_SHARED);
623 vp = hammer2_igetv(pmp->iroot, &error);
624 hammer2_chain_unlock(hmp, &pmp->iroot->chain);
627 kprintf("vnodefail\n");
629 hammer2_mount_unlock(hmp);
637 * XXX incorporate pmp->iroot->ip_data.inode_quota and data_quota
641 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
643 hammer2_pfsmount_t *pmp;
644 hammer2_mount_t *hmp;
649 mp->mnt_stat.f_files = pmp->iroot->ip_data.inode_count +
650 pmp->iroot->delta_icount;
651 mp->mnt_stat.f_ffree = 0;
652 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
653 mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
654 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
655 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
663 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
665 hammer2_pfsmount_t *pmp;
666 hammer2_mount_t *hmp;
671 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
672 mp->mnt_vstat.f_files = pmp->iroot->ip_data.inode_count +
673 pmp->iroot->delta_icount;
674 mp->mnt_vstat.f_ffree = 0;
675 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
676 mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
677 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
678 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
680 *sbp = mp->mnt_vstat;
685 * Sync the entire filesystem; this is called from the filesystem syncer
686 * process periodically and whenever a user calls sync(1) on the hammer
689 * Currently is actually called from the syncer! \o/
691 * This task will have to snapshot the state of the dirty inode chain.
692 * From that, it will have to make sure all of the inodes on the dirty
693 * chain have IO initiated. We make sure that io is initiated for the root
696 * If waitfor is set, we wait for media to acknowledge the new rootblock.
698 * THINKS: side A vs side B, to have sync not stall all I/O?
702 hammer2_vfs_sync(struct mount *mp, int waitfor)
704 struct hammer2_sync_info info;
705 hammer2_mount_t *hmp;
713 if (waitfor & MNT_LAZY)
714 flags |= VMSC_ONEPASS;
717 info.waitfor = MNT_NOWAIT;
718 vmntvnodescan(mp, flags | VMSC_NOWAIT,
720 hammer2_sync_scan2, &info);
721 if (info.error == 0 && (waitfor & MNT_WAIT)) {
722 info.waitfor = waitfor;
723 vmntvnodescan(mp, flags,
725 hammer2_sync_scan2, &info);
729 if (waitfor == MNT_WAIT) {
735 hammer2_chain_lock(hmp, &hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
736 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
737 HAMMER2_CHAIN_MODIFIED_AUX |
738 HAMMER2_CHAIN_SUBMODIFIED)) {
739 hammer2_chain_flush(hmp, &hmp->vchain, 0);
744 hammer2_chain_unlock(hmp, &hmp->vchain);
748 if ((waitfor & MNT_LAZY) == 0) {
749 waitfor = MNT_NOWAIT;
750 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
751 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
752 vn_unlock(hmp->devvp);
755 if (error == 0 && haswork) {
759 * Synchronize the disk before flushing the volume
763 bp->b_bio1.bio_offset = 0;
766 bp->b_cmd = BUF_CMD_FLUSH;
767 bp->b_bio1.bio_done = biodone_sync;
768 bp->b_bio1.bio_flags |= BIO_SYNC;
769 vn_strategy(hmp->devvp, &bp->b_bio1);
770 biowait(&bp->b_bio1, "h2vol");
774 * Then we can safely flush the volume header. Volume
775 * data is locked separately to prevent ioctl functions
776 * from deadlocking due to a configuration issue.
778 bp = getblk(hmp->devvp, 0, HAMMER2_PBUFSIZE, 0, 0);
779 hammer2_voldata_lock(hmp);
780 bcopy(&hmp->voldata, bp->b_data, HAMMER2_PBUFSIZE);
781 hammer2_voldata_unlock(hmp);
790 * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
791 * won't flush on those flags. The syncer code above will do a
792 * general meta-data flush globally that will catch these flags.
795 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
800 if (vp->v_type == VNON || ip == NULL ||
801 ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
802 HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
803 RB_EMPTY(&vp->v_rbdirty_tree))) {
810 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
812 struct hammer2_sync_info *info = data;
817 if (vp->v_type == VNON || vp->v_type == VBAD ||
818 ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
819 HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
820 RB_EMPTY(&vp->v_rbdirty_tree))) {
823 error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
831 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
838 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
839 struct fid *fhp, struct vnode **vpp)
846 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
847 int *exflagsp, struct ucred **credanonp)
853 * Support code for hammer2_mount(). Read, verify, and install the volume
854 * header into the HMP
856 * XXX read four volhdrs and use the one with the highest TID whos CRC
861 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
862 * nonexistant locations.
864 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
868 hammer2_install_volume_header(hammer2_mount_t *hmp)
870 hammer2_volume_data_t *vd;
872 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
884 * There are up to 4 copies of the volume header (syncs iterate
885 * between them so there is no single master). We don't trust the
886 * volu_size field so we don't know precisely how large the filesystem
887 * is, so depend on the OS to return an error if we go beyond the
888 * block device's EOF.
890 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
891 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
892 HAMMER2_VOLUME_BYTES, &bp);
899 vd = (struct hammer2_volume_data *) bp->b_data;
900 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
901 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
907 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
908 /* XXX: Reversed-endianness filesystem */
909 kprintf("hammer2: reverse-endian filesystem detected");
915 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
916 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
917 HAMMER2_VOLUME_ICRC0_SIZE);
918 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
919 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
920 HAMMER2_VOLUME_ICRC1_SIZE);
921 if ((crc0 != crc) || (bcrc0 != bcrc)) {
922 kprintf("hammer2 volume header crc "
923 "mismatch copy #%d\t%08x %08x",
930 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
940 kprintf("hammer2: a valid volume header was found\n");
943 kprintf("hammer2: no valid volume headers found!\n");