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>
45 #include <sys/socket.h>
48 #include "hammer2_disk.h"
49 #include "hammer2_mount.h"
51 struct hammer2_sync_info {
56 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
57 static struct hammer2_mntlist hammer2_mntlist;
58 static struct lock hammer2_mntlk;
61 int hammer2_cluster_enable = 1;
62 int hammer2_hardlink_enable = 1;
63 long hammer2_iod_file_read;
64 long hammer2_iod_meta_read;
65 long hammer2_iod_indr_read;
66 long hammer2_iod_file_write;
67 long hammer2_iod_meta_write;
68 long hammer2_iod_indr_write;
69 long hammer2_iod_volu_write;
70 long hammer2_ioa_file_read;
71 long hammer2_ioa_meta_read;
72 long hammer2_ioa_indr_read;
73 long hammer2_ioa_file_write;
74 long hammer2_ioa_meta_write;
75 long hammer2_ioa_indr_write;
76 long hammer2_ioa_volu_write;
78 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
80 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
81 &hammer2_debug, 0, "");
82 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
83 &hammer2_cluster_enable, 0, "");
84 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
85 &hammer2_hardlink_enable, 0, "");
86 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
87 &hammer2_iod_file_read, 0, "");
88 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
89 &hammer2_iod_meta_read, 0, "");
90 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
91 &hammer2_iod_indr_read, 0, "");
92 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
93 &hammer2_iod_file_write, 0, "");
94 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
95 &hammer2_iod_meta_write, 0, "");
96 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
97 &hammer2_iod_indr_write, 0, "");
98 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
99 &hammer2_iod_volu_write, 0, "");
100 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
101 &hammer2_ioa_file_read, 0, "");
102 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
103 &hammer2_ioa_meta_read, 0, "");
104 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
105 &hammer2_ioa_indr_read, 0, "");
106 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
107 &hammer2_ioa_file_write, 0, "");
108 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
109 &hammer2_ioa_meta_write, 0, "");
110 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
111 &hammer2_ioa_indr_write, 0, "");
112 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
113 &hammer2_ioa_volu_write, 0, "");
115 static int hammer2_vfs_init(struct vfsconf *conf);
116 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
118 static int hammer2_remount(struct mount *, char *, struct vnode *,
120 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
121 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
122 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
124 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
126 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
127 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
128 ino_t ino, struct vnode **vpp);
129 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
130 struct fid *fhp, struct vnode **vpp);
131 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
132 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
133 int *exflagsp, struct ucred **credanonp);
135 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
136 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
137 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
139 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
140 static void hammer2_autodmsg(kdmsg_msg_t *msg);
143 * HAMMER2 vfs operations.
145 static struct vfsops hammer2_vfsops = {
146 .vfs_init = hammer2_vfs_init,
147 .vfs_sync = hammer2_vfs_sync,
148 .vfs_mount = hammer2_vfs_mount,
149 .vfs_unmount = hammer2_vfs_unmount,
150 .vfs_root = hammer2_vfs_root,
151 .vfs_statfs = hammer2_vfs_statfs,
152 .vfs_statvfs = hammer2_vfs_statvfs,
153 .vfs_vget = hammer2_vfs_vget,
154 .vfs_vptofh = hammer2_vfs_vptofh,
155 .vfs_fhtovp = hammer2_vfs_fhtovp,
156 .vfs_checkexp = hammer2_vfs_checkexp
159 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
161 VFS_SET(hammer2_vfsops, hammer2, 0);
162 MODULE_VERSION(hammer2, 1);
166 hammer2_vfs_init(struct vfsconf *conf)
172 if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
174 if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
176 if (HAMMER2_ALLOCREF_BYTES != sizeof(struct hammer2_allocref))
178 if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
182 kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
184 lockinit(&hammer2_mntlk, "mntlk", 0, 0);
185 TAILQ_INIT(&hammer2_mntlist);
191 * Mount or remount HAMMER2 fileystem from physical media
194 * mp mount point structure
200 * mp mount point structure
201 * path path to mount point
202 * data pointer to argument structure in user space
203 * volume volume path (device@LABEL form)
204 * hflags user mount flags
205 * cred user credentials
212 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
215 struct hammer2_mount_info info;
216 hammer2_pfsmount_t *pmp;
217 hammer2_mount_t *hmp;
220 struct nlookupdata nd;
221 hammer2_chain_t *parent;
222 hammer2_chain_t *schain;
223 hammer2_chain_t *rchain;
225 char devstr[MNAMELEN];
240 kprintf("hammer2_mount\n");
246 bzero(&info, sizeof(info));
247 info.cluster_fd = -1;
251 * Non-root mount or updating a mount
253 error = copyin(data, &info, sizeof(info));
257 error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
261 /* Extract device and label */
263 label = strchr(devstr, '@');
265 ((label + 1) - dev) > done) {
273 if (mp->mnt_flag & MNT_UPDATE) {
275 /* HAMMER2 implements NFS export via mountctl */
278 error = hammer2_remount(mp, path, devvp, cred);
286 * Lookup name and verify it refers to a block device.
288 error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
290 error = nlookup(&nd);
292 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
296 if (vn_isdisk(devvp, &error))
297 error = vfs_mountedon(devvp);
301 * Determine if the device has already been mounted. After this
302 * check hmp will be non-NULL if we are doing the second or more
303 * hammer2 mounts from the same device.
305 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
306 TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
307 if (hmp->devvp == devvp)
312 * Open the device if this isn't a secondary mount
318 if (error == 0 && vcount(devvp) > 0)
322 * Now open the device
325 ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
326 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
327 error = vinvalbuf(devvp, V_SAVE, 0, 0);
329 error = VOP_OPEN(devvp,
330 ronly ? FREAD : FREAD | FWRITE,
335 if (error && devvp) {
340 lockmgr(&hammer2_mntlk, LK_RELEASE);
346 * Block device opened successfully, finish initializing the
349 * From this point on we have to call hammer2_unmount() on failure.
351 pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
352 mp->mnt_data = (qaddr_t)pmp;
355 kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
356 kdmsg_iocom_init(&pmp->iocom, pmp,
357 KDMSG_IOCOMF_AUTOCONN |
358 KDMSG_IOCOMF_AUTOSPAN |
359 KDMSG_IOCOMF_AUTOCIRC,
360 pmp->mmsg, hammer2_rcvdmsg);
363 hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
366 kmalloc_create(&hmp->minode, "HAMMER2-inodes");
367 kmalloc_create(&hmp->mchain, "HAMMER2-chains");
368 TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
370 ccms_domain_init(&pmp->ccms_dom);
373 lockmgr(&hammer2_mntlk, LK_RELEASE);
374 kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
376 mp->mnt_flag = MNT_LOCAL;
377 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; /* all entry pts are SMP */
381 * vchain setup. vchain.data is special cased to NULL.
382 * vchain.refs is initialized and will never drop to 0.
384 hmp->vchain.refs = 1;
385 hmp->vchain.data = (void *)&hmp->voldata;
386 hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
387 hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
388 hmp->vchain.bref_flush = hmp->vchain.bref;
389 ccms_cst_init(&hmp->vchain.cst, NULL);
390 /* hmp->vchain.u.xxx is left NULL */
391 lockinit(&hmp->alloclk, "h2alloc", 0, 0);
392 lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
395 * Install the volume header
397 error = hammer2_install_volume_header(hmp);
399 hammer2_vfs_unmount(mp, MNT_FORCE);
405 * required mount structure initializations
407 mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
408 mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
410 mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
411 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
416 mp->mnt_iosize_max = MAXPHYS;
419 * First locate the super-root inode, which is key 0 relative to the
420 * volume header's blockset.
422 * Then locate the root inode by scanning the directory keyspace
423 * represented by the label.
426 parent = &hmp->vchain;
427 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
428 schain = hammer2_chain_lookup(hmp, &parent,
429 HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
430 hammer2_chain_unlock(hmp, parent);
431 if (schain == NULL) {
432 kprintf("hammer2_mount: invalid super-root\n");
433 hammer2_vfs_unmount(mp, MNT_FORCE);
436 hammer2_chain_ref(hmp, schain); /* for hmp->schain */
437 hmp->schain = schain; /* left locked */
439 schain = hmp->schain;
440 hammer2_chain_lock(hmp, schain, HAMMER2_RESOLVE_ALWAYS);
444 lhc = hammer2_dirhash(label, strlen(label));
445 rchain = hammer2_chain_lookup(hmp, &parent,
446 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
449 if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
451 strcmp(label, rchain->data->ipdata.filename) == 0) {
454 rchain = hammer2_chain_next(hmp, &parent, rchain,
455 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
458 hammer2_chain_unlock(hmp, parent);
459 if (rchain == NULL) {
460 kprintf("hammer2_mount: PFS label not found\n");
461 hammer2_vfs_unmount(mp, MNT_FORCE);
464 if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
465 hammer2_chain_unlock(hmp, rchain);
466 kprintf("hammer2_mount: PFS label already mounted!\n");
467 hammer2_vfs_unmount(mp, MNT_FORCE);
470 atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
472 hammer2_chain_ref(hmp, rchain); /* for pmp->rchain */
473 hammer2_chain_unlock(hmp, rchain);
474 pmp->rchain = rchain; /* left held & unlocked */
475 pmp->iroot = rchain->u.ip; /* implied hold from rchain */
476 pmp->iroot->pmp = pmp;
478 kprintf("iroot %p\n", pmp->iroot);
481 * Ref the cluster management messaging descriptor. The mount
482 * program deals with the other end of the communications pipe.
484 fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
486 kprintf("hammer2_mount: bad cluster_fd!\n");
487 hammer2_vfs_unmount(mp, MNT_FORCE);
490 hammer2_cluster_reconnect(pmp, fp);
496 vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
497 vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
498 vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
500 copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
501 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
502 bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
503 copyinstr(path, mp->mnt_stat.f_mntonname,
504 sizeof(mp->mnt_stat.f_mntonname) - 1,
508 * Initial statfs to prime mnt_stat.
510 hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
517 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
525 hammer2_vfs_unmount(struct mount *mp, int mntflags)
527 hammer2_pfsmount_t *pmp;
528 hammer2_mount_t *hmp;
531 int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
538 if (mntflags & MNT_FORCE)
541 hammer2_mount_exlock(hmp);
544 * If mount initialization proceeded far enough we must flush
548 error = vflush(mp, 0, flags);
553 lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
555 kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
558 * Flush any left over chains. The voldata lock is only used
559 * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
561 hammer2_voldata_lock(hmp);
562 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
563 HAMMER2_CHAIN_MODIFIED_AUX |
564 HAMMER2_CHAIN_SUBMODIFIED)) {
565 hammer2_voldata_unlock(hmp);
566 hammer2_vfs_sync(mp, MNT_WAIT);
568 hammer2_voldata_unlock(hmp);
570 if (hmp->pmp_count == 0) {
571 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
572 HAMMER2_CHAIN_MODIFIED_AUX |
573 HAMMER2_CHAIN_SUBMODIFIED)) {
574 kprintf("hammer2_unmount: chains left over after "
576 if (hammer2_debug & 0x0010)
577 Debugger("entered debugger");
582 * Cleanup the root and super-root chain elements (which should be
587 atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
588 KKASSERT(pmp->rchain->refs == 1);
589 hammer2_chain_drop(hmp, pmp->rchain);
592 ccms_domain_uninit(&pmp->ccms_dom);
595 * Kill cluster controller
597 kdmsg_iocom_uninit(&pmp->iocom);
600 * If no PFS's left drop the master hammer2_mount for the device.
602 if (hmp->pmp_count == 0) {
604 KKASSERT(hmp->schain->refs == 1);
605 hammer2_chain_drop(hmp, hmp->schain);
610 * Finish up with the device vnode
612 if ((devvp = hmp->devvp) != NULL) {
613 vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
615 VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
620 hammer2_mount_unlock(hmp);
626 kmalloc_destroy(&pmp->mmsg);
628 kfree(pmp, M_HAMMER2);
629 if (hmp->pmp_count == 0) {
630 TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
631 kmalloc_destroy(&hmp->minode);
632 kmalloc_destroy(&hmp->mchain);
633 kfree(hmp, M_HAMMER2);
635 lockmgr(&hammer2_mntlk, LK_RELEASE);
641 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
642 ino_t ino, struct vnode **vpp)
644 kprintf("hammer2_vget\n");
650 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
652 hammer2_pfsmount_t *pmp;
653 hammer2_mount_t *hmp;
659 hammer2_mount_exlock(hmp);
660 if (pmp->iroot == NULL) {
664 hammer2_chain_lock(hmp, &pmp->iroot->chain,
665 HAMMER2_RESOLVE_ALWAYS |
666 HAMMER2_RESOLVE_SHARED);
667 vp = hammer2_igetv(pmp->iroot, &error);
668 hammer2_chain_unlock(hmp, &pmp->iroot->chain);
671 kprintf("vnodefail\n");
673 hammer2_mount_unlock(hmp);
681 * XXX incorporate pmp->iroot->ip_data.inode_quota and data_quota
685 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
687 hammer2_pfsmount_t *pmp;
688 hammer2_mount_t *hmp;
693 mp->mnt_stat.f_files = pmp->iroot->ip_data.inode_count +
694 pmp->iroot->delta_icount;
695 mp->mnt_stat.f_ffree = 0;
696 mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
697 mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
698 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
699 mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
707 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
709 hammer2_pfsmount_t *pmp;
710 hammer2_mount_t *hmp;
715 mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
716 mp->mnt_vstat.f_files = pmp->iroot->ip_data.inode_count +
717 pmp->iroot->delta_icount;
718 mp->mnt_vstat.f_ffree = 0;
719 mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
720 mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
721 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
722 mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
724 *sbp = mp->mnt_vstat;
729 * Sync the entire filesystem; this is called from the filesystem syncer
730 * process periodically and whenever a user calls sync(1) on the hammer
733 * Currently is actually called from the syncer! \o/
735 * This task will have to snapshot the state of the dirty inode chain.
736 * From that, it will have to make sure all of the inodes on the dirty
737 * chain have IO initiated. We make sure that io is initiated for the root
740 * If waitfor is set, we wait for media to acknowledge the new rootblock.
742 * THINKS: side A vs side B, to have sync not stall all I/O?
746 hammer2_vfs_sync(struct mount *mp, int waitfor)
748 struct hammer2_sync_info info;
749 hammer2_mount_t *hmp;
757 if (waitfor & MNT_LAZY)
758 flags |= VMSC_ONEPASS;
761 info.waitfor = MNT_NOWAIT;
762 vmntvnodescan(mp, flags | VMSC_NOWAIT,
764 hammer2_sync_scan2, &info);
765 if (info.error == 0 && (waitfor & MNT_WAIT)) {
766 info.waitfor = waitfor;
767 vmntvnodescan(mp, flags,
769 hammer2_sync_scan2, &info);
773 if (waitfor == MNT_WAIT) {
779 hammer2_chain_lock(hmp, &hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
780 if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
781 HAMMER2_CHAIN_MODIFIED_AUX |
782 HAMMER2_CHAIN_SUBMODIFIED)) {
783 hammer2_chain_flush(hmp, &hmp->vchain, 0);
788 hammer2_chain_unlock(hmp, &hmp->vchain);
792 if ((waitfor & MNT_LAZY) == 0) {
793 waitfor = MNT_NOWAIT;
794 vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
795 error = VOP_FSYNC(hmp->devvp, waitfor, 0);
796 vn_unlock(hmp->devvp);
799 if (error == 0 && haswork) {
803 * Synchronize the disk before flushing the volume
807 bp->b_bio1.bio_offset = 0;
810 bp->b_cmd = BUF_CMD_FLUSH;
811 bp->b_bio1.bio_done = biodone_sync;
812 bp->b_bio1.bio_flags |= BIO_SYNC;
813 vn_strategy(hmp->devvp, &bp->b_bio1);
814 biowait(&bp->b_bio1, "h2vol");
818 * Then we can safely flush the volume header. Volume
819 * data is locked separately to prevent ioctl functions
820 * from deadlocking due to a configuration issue.
822 bp = getblk(hmp->devvp, 0, HAMMER2_PBUFSIZE, 0, 0);
823 hammer2_voldata_lock(hmp);
824 bcopy(&hmp->voldata, bp->b_data, HAMMER2_PBUFSIZE);
825 hammer2_voldata_unlock(hmp);
834 * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
835 * won't flush on those flags. The syncer code above will do a
836 * general meta-data flush globally that will catch these flags.
839 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
844 if (vp->v_type == VNON || ip == NULL ||
845 ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
846 HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
847 RB_EMPTY(&vp->v_rbdirty_tree))) {
854 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
856 struct hammer2_sync_info *info = data;
861 if (vp->v_type == VNON || vp->v_type == VBAD ||
862 ((ip->chain.flags & (HAMMER2_CHAIN_MODIFIED |
863 HAMMER2_CHAIN_DIRTYEMBED)) == 0 &&
864 RB_EMPTY(&vp->v_rbdirty_tree))) {
867 error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
875 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
882 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
883 struct fid *fhp, struct vnode **vpp)
890 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
891 int *exflagsp, struct ucred **credanonp)
897 * Support code for hammer2_mount(). Read, verify, and install the volume
898 * header into the HMP
900 * XXX read four volhdrs and use the one with the highest TID whos CRC
905 * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
906 * nonexistant locations.
908 * XXX Record selected volhdr and ring updates to each of 4 volhdrs
912 hammer2_install_volume_header(hammer2_mount_t *hmp)
914 hammer2_volume_data_t *vd;
916 hammer2_crc32_t crc0, crc, bcrc0, bcrc;
928 * There are up to 4 copies of the volume header (syncs iterate
929 * between them so there is no single master). We don't trust the
930 * volu_size field so we don't know precisely how large the filesystem
931 * is, so depend on the OS to return an error if we go beyond the
932 * block device's EOF.
934 for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
935 error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
936 HAMMER2_VOLUME_BYTES, &bp);
943 vd = (struct hammer2_volume_data *) bp->b_data;
944 if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
945 (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
951 if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
952 /* XXX: Reversed-endianness filesystem */
953 kprintf("hammer2: reverse-endian filesystem detected");
959 crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
960 crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
961 HAMMER2_VOLUME_ICRC0_SIZE);
962 bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
963 bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
964 HAMMER2_VOLUME_ICRC1_SIZE);
965 if ((crc0 != crc) || (bcrc0 != bcrc)) {
966 kprintf("hammer2 volume header crc "
967 "mismatch copy #%d\t%08x %08x",
974 if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
984 kprintf("hammer2: a valid volume header was found\n");
987 kprintf("hammer2: no valid volume headers found!\n");
993 * Reconnect using the passed file pointer. The caller must ref the
997 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1002 * Closes old comm descriptor, kills threads, cleans up
1003 * states, then installs the new descriptor and creates
1006 kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1009 * Setup LNK_CONN fields for autoinitiated state machine
1011 pmp->iocom.auto_lnk_conn.pfs_clid = pmp->iroot->ip_data.pfs_clid;
1012 pmp->iocom.auto_lnk_conn.pfs_fsid = pmp->iroot->ip_data.pfs_fsid;
1013 pmp->iocom.auto_lnk_conn.pfs_type = pmp->iroot->ip_data.pfs_type;
1014 pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1015 pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1018 * Filter adjustment. Clients do not need visibility into other
1019 * clients (otherwise millions of clients would present a serious
1020 * problem). The fs_label also serves to restrict the namespace.
1022 pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1023 pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1024 switch (pmp->iroot->ip_data.pfs_type) {
1025 case DMSG_PFSTYPE_CLIENT:
1026 pmp->iocom.auto_lnk_conn.peer_mask &=
1027 ~(1LLU << DMSG_PFSTYPE_CLIENT);
1033 name_len = pmp->iroot->ip_data.name_len;
1034 if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1035 name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1036 bcopy(pmp->iroot->ip_data.filename,
1037 pmp->iocom.auto_lnk_conn.fs_label,
1039 pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1042 * Setup LNK_SPAN fields for autoinitiated state machine
1044 pmp->iocom.auto_lnk_span.pfs_clid = pmp->iroot->ip_data.pfs_clid;
1045 pmp->iocom.auto_lnk_span.pfs_fsid = pmp->iroot->ip_data.pfs_fsid;
1046 pmp->iocom.auto_lnk_span.pfs_type = pmp->iroot->ip_data.pfs_type;
1047 pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1048 pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1049 name_len = pmp->iroot->ip_data.name_len;
1050 if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1051 name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1052 bcopy(pmp->iroot->ip_data.filename,
1053 pmp->iocom.auto_lnk_span.fs_label,
1055 pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1057 kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1061 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1063 switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1064 case DMSG_DBG_SHELL:
1066 * Execute shell command (not supported atm)
1068 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1070 case DMSG_DBG_SHELL | DMSGF_REPLY:
1071 if (msg->aux_data) {
1072 msg->aux_data[msg->aux_size - 1] = 0;
1073 kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1078 * Unsupported LNK message received. We only need to
1079 * reply if it's a transaction in order to close our end.
1080 * Ignore any one-way messages are any further messages
1081 * associated with the transaction.
1083 * NOTE: This case also includes DMSG_LNK_ERROR messages
1084 * which might be one-way, replying to those would
1085 * cause an infinite ping-pong.
1087 if (msg->any.head.cmd & DMSGF_CREATE)
1088 kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1095 * This function is called after KDMSG has automatically handled processing
1096 * of a LNK layer message (typically CONN, SPAN, or CIRC).
1098 * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1099 * advertises all available hammer2 super-root volumes.
1102 hammer2_autodmsg(kdmsg_msg_t *msg)
1104 hammer2_pfsmount_t *pmp = msg->iocom->handle;
1105 hammer2_mount_t *hmp = pmp->hmp;
1109 * We only care about replies to our LNK_CONN auto-request. kdmsg
1110 * has already processed the reply, we use this calback as a shim
1111 * to know when we can advertise available super-root volumes.
1113 if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1114 (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1115 msg->state == NULL) {
1119 kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1121 if (msg->any.head.cmd & DMSGF_CREATE) {
1122 kprintf("HAMMER2: VOLDATA DUMP\n");
1125 * Dump the configuration stored in the volume header
1127 hammer2_voldata_lock(hmp);
1128 for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1129 if (hmp->voldata.copyinfo[copyid].copyid == 0)
1131 hammer2_volconf_update(pmp, copyid);
1133 hammer2_voldata_unlock(hmp);
1135 if ((msg->any.head.cmd & DMSGF_DELETE) &&
1136 msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1137 kprintf("HAMMER2: CONN WAS TERMINATED\n");
1142 * Volume configuration updates are passed onto the userland service
1143 * daemon via the open LNK_CONN transaction.
1146 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1148 hammer2_mount_t *hmp = pmp->hmp;
1151 /* XXX interlock against connection state termination */
1152 kprintf("volconf update %p\n", pmp->iocom.conn_state);
1153 if (pmp->iocom.conn_state) {
1154 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1155 msg = kdmsg_msg_alloc(&pmp->iocom, 0,
1158 msg->state = pmp->iocom.conn_state;
1159 msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1160 msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1161 msg->any.lnk_volconf.index = index;
1162 kdmsg_msg_write(msg);