xref: /dflybsd-src/sys/vfs/hammer2/hammer2_vfsops.c (revision f1e3af6c0d9fb009456c1ad7a10c323acbf7022f)
1 /*-
2  * Copyright (c) 2011-2013 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 #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>
41 #include <sys/buf.h>
42 #include <sys/uuid.h>
43 #include <sys/vfsops.h>
44 #include <sys/sysctl.h>
45 #include <sys/socket.h>
46 
47 #include "hammer2.h"
48 #include "hammer2_disk.h"
49 #include "hammer2_mount.h"
50 
51 #define REPORT_REFS_ERRORS 1	/* XXX remove me */
52 
53 struct hammer2_sync_info {
54 	hammer2_trans_t trans;
55 	int error;
56 	int waitfor;
57 };
58 
59 TAILQ_HEAD(hammer2_mntlist, hammer2_mount);
60 static struct hammer2_mntlist hammer2_mntlist;
61 static struct lock hammer2_mntlk;
62 
63 int hammer2_debug;
64 int hammer2_cluster_enable = 1;
65 int hammer2_hardlink_enable = 1;
66 long hammer2_iod_file_read;
67 long hammer2_iod_meta_read;
68 long hammer2_iod_indr_read;
69 long hammer2_iod_file_write;
70 long hammer2_iod_meta_write;
71 long hammer2_iod_indr_write;
72 long hammer2_iod_fmap_write;
73 long hammer2_iod_volu_write;
74 long hammer2_ioa_file_read;
75 long hammer2_ioa_meta_read;
76 long hammer2_ioa_indr_read;
77 long hammer2_ioa_fmap_write;
78 long hammer2_ioa_file_write;
79 long hammer2_ioa_meta_write;
80 long hammer2_ioa_indr_write;
81 long hammer2_ioa_volu_write;
82 
83 SYSCTL_NODE(_vfs, OID_AUTO, hammer2, CTLFLAG_RW, 0, "HAMMER2 filesystem");
84 
85 SYSCTL_INT(_vfs_hammer2, OID_AUTO, debug, CTLFLAG_RW,
86 	   &hammer2_debug, 0, "");
87 SYSCTL_INT(_vfs_hammer2, OID_AUTO, cluster_enable, CTLFLAG_RW,
88 	   &hammer2_cluster_enable, 0, "");
89 SYSCTL_INT(_vfs_hammer2, OID_AUTO, hardlink_enable, CTLFLAG_RW,
90 	   &hammer2_hardlink_enable, 0, "");
91 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_read, CTLFLAG_RW,
92 	   &hammer2_iod_file_read, 0, "");
93 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_read, CTLFLAG_RW,
94 	   &hammer2_iod_meta_read, 0, "");
95 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_read, CTLFLAG_RW,
96 	   &hammer2_iod_indr_read, 0, "");
97 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_file_write, CTLFLAG_RW,
98 	   &hammer2_iod_file_write, 0, "");
99 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_meta_write, CTLFLAG_RW,
100 	   &hammer2_iod_meta_write, 0, "");
101 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_indr_write, CTLFLAG_RW,
102 	   &hammer2_iod_indr_write, 0, "");
103 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, iod_volu_write, CTLFLAG_RW,
104 	   &hammer2_iod_volu_write, 0, "");
105 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_read, CTLFLAG_RW,
106 	   &hammer2_ioa_file_read, 0, "");
107 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_read, CTLFLAG_RW,
108 	   &hammer2_ioa_meta_read, 0, "");
109 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_read, CTLFLAG_RW,
110 	   &hammer2_ioa_indr_read, 0, "");
111 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_file_write, CTLFLAG_RW,
112 	   &hammer2_ioa_file_write, 0, "");
113 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_meta_write, CTLFLAG_RW,
114 	   &hammer2_ioa_meta_write, 0, "");
115 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_indr_write, CTLFLAG_RW,
116 	   &hammer2_ioa_indr_write, 0, "");
117 SYSCTL_LONG(_vfs_hammer2, OID_AUTO, ioa_volu_write, CTLFLAG_RW,
118 	   &hammer2_ioa_volu_write, 0, "");
119 
120 static int hammer2_vfs_init(struct vfsconf *conf);
121 static int hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
122 				struct ucred *cred);
123 static int hammer2_remount(struct mount *, char *, struct vnode *,
124 				struct ucred *);
125 static int hammer2_vfs_unmount(struct mount *mp, int mntflags);
126 static int hammer2_vfs_root(struct mount *mp, struct vnode **vpp);
127 static int hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp,
128 				struct ucred *cred);
129 static int hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
130 				struct ucred *cred);
131 static int hammer2_vfs_sync(struct mount *mp, int waitfor);
132 static int hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
133 				ino_t ino, struct vnode **vpp);
134 static int hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
135 				struct fid *fhp, struct vnode **vpp);
136 static int hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp);
137 static int hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
138 				int *exflagsp, struct ucred **credanonp);
139 
140 static int hammer2_install_volume_header(hammer2_mount_t *hmp);
141 static int hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
142 static int hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
143 
144 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
145 static void hammer2_autodmsg(kdmsg_msg_t *msg);
146 
147 /*
148  * HAMMER2 vfs operations.
149  */
150 static struct vfsops hammer2_vfsops = {
151 	.vfs_init	= hammer2_vfs_init,
152 	.vfs_sync	= hammer2_vfs_sync,
153 	.vfs_mount	= hammer2_vfs_mount,
154 	.vfs_unmount	= hammer2_vfs_unmount,
155 	.vfs_root 	= hammer2_vfs_root,
156 	.vfs_statfs	= hammer2_vfs_statfs,
157 	.vfs_statvfs	= hammer2_vfs_statvfs,
158 	.vfs_vget	= hammer2_vfs_vget,
159 	.vfs_vptofh	= hammer2_vfs_vptofh,
160 	.vfs_fhtovp	= hammer2_vfs_fhtovp,
161 	.vfs_checkexp	= hammer2_vfs_checkexp
162 };
163 
164 MALLOC_DEFINE(M_HAMMER2, "HAMMER2-mount", "");
165 
166 VFS_SET(hammer2_vfsops, hammer2, 0);
167 MODULE_VERSION(hammer2, 1);
168 
169 static
170 int
171 hammer2_vfs_init(struct vfsconf *conf)
172 {
173 	int error;
174 
175 	error = 0;
176 
177 	if (HAMMER2_BLOCKREF_BYTES != sizeof(struct hammer2_blockref))
178 		error = EINVAL;
179 	if (HAMMER2_INODE_BYTES != sizeof(struct hammer2_inode_data))
180 		error = EINVAL;
181 	if (HAMMER2_VOLUME_BYTES != sizeof(struct hammer2_volume_data))
182 		error = EINVAL;
183 
184 	if (error)
185 		kprintf("HAMMER2 structure size mismatch; cannot continue.\n");
186 
187 	lockinit(&hammer2_mntlk, "mntlk", 0, 0);
188 	TAILQ_INIT(&hammer2_mntlist);
189 
190 	return (error);
191 }
192 
193 /*
194  * Mount or remount HAMMER2 fileystem from physical media
195  *
196  *	mountroot
197  *		mp		mount point structure
198  *		path		NULL
199  *		data		<unused>
200  *		cred		<unused>
201  *
202  *	mount
203  *		mp		mount point structure
204  *		path		path to mount point
205  *		data		pointer to argument structure in user space
206  *			volume	volume path (device@LABEL form)
207  *			hflags	user mount flags
208  *		cred		user credentials
209  *
210  * RETURNS:	0	Success
211  *		!0	error number
212  */
213 static
214 int
215 hammer2_vfs_mount(struct mount *mp, char *path, caddr_t data,
216 		  struct ucred *cred)
217 {
218 	struct hammer2_mount_info info;
219 	hammer2_pfsmount_t *pmp;
220 	hammer2_mount_t *hmp;
221 	hammer2_key_t lhc;
222 	struct vnode *devvp;
223 	struct nlookupdata nd;
224 	hammer2_chain_t *parent;
225 	hammer2_chain_t *schain;
226 	hammer2_chain_t *rchain;
227 	struct file *fp;
228 	char devstr[MNAMELEN];
229 	size_t size;
230 	size_t done;
231 	char *dev;
232 	char *label;
233 	int ronly = 1;
234 	int create_hmp;
235 	int error;
236 
237 	hmp = NULL;
238 	pmp = NULL;
239 	dev = NULL;
240 	label = NULL;
241 	devvp = NULL;
242 
243 	kprintf("hammer2_mount\n");
244 
245 	if (path == NULL) {
246 		/*
247 		 * Root mount
248 		 */
249 		bzero(&info, sizeof(info));
250 		info.cluster_fd = -1;
251 		return (EOPNOTSUPP);
252 	} else {
253 		/*
254 		 * Non-root mount or updating a mount
255 		 */
256 		error = copyin(data, &info, sizeof(info));
257 		if (error)
258 			return (error);
259 
260 		error = copyinstr(info.volume, devstr, MNAMELEN - 1, &done);
261 		if (error)
262 			return (error);
263 
264 		/* Extract device and label */
265 		dev = devstr;
266 		label = strchr(devstr, '@');
267 		if (label == NULL ||
268 		    ((label + 1) - dev) > done) {
269 			return (EINVAL);
270 		}
271 		*label = '\0';
272 		label++;
273 		if (*label == '\0')
274 			return (EINVAL);
275 
276 		if (mp->mnt_flag & MNT_UPDATE) {
277 			/* Update mount */
278 			/* HAMMER2 implements NFS export via mountctl */
279 			hmp = MPTOHMP(mp);
280 			devvp = hmp->devvp;
281 			error = hammer2_remount(mp, path, devvp, cred);
282 			return error;
283 		}
284 	}
285 
286 	/*
287 	 * PFS mount
288 	 *
289 	 * Lookup name and verify it refers to a block device.
290 	 */
291 	error = nlookup_init(&nd, dev, UIO_SYSSPACE, NLC_FOLLOW);
292 	if (error == 0)
293 		error = nlookup(&nd);
294 	if (error == 0)
295 		error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
296 	nlookup_done(&nd);
297 
298 	if (error == 0) {
299 		if (vn_isdisk(devvp, &error))
300 			error = vfs_mountedon(devvp);
301 	}
302 
303 	/*
304 	 * Determine if the device has already been mounted.  After this
305 	 * check hmp will be non-NULL if we are doing the second or more
306 	 * hammer2 mounts from the same device.
307 	 */
308 	lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
309 	TAILQ_FOREACH(hmp, &hammer2_mntlist, mntentry) {
310 		if (hmp->devvp == devvp)
311 			break;
312 	}
313 
314 	/*
315 	 * Open the device if this isn't a secondary mount
316 	 */
317 	if (hmp) {
318 		create_hmp = 0;
319 	} else {
320 		create_hmp = 1;
321 		if (error == 0 && vcount(devvp) > 0)
322 			error = EBUSY;
323 
324 		/*
325 		 * Now open the device
326 		 */
327 		if (error == 0) {
328 			ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
329 			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
330 			error = vinvalbuf(devvp, V_SAVE, 0, 0);
331 			if (error == 0) {
332 				error = VOP_OPEN(devvp,
333 						 ronly ? FREAD : FREAD | FWRITE,
334 						 FSCRED, NULL);
335 			}
336 			vn_unlock(devvp);
337 		}
338 		if (error && devvp) {
339 			vrele(devvp);
340 			devvp = NULL;
341 		}
342 		if (error) {
343 			lockmgr(&hammer2_mntlk, LK_RELEASE);
344 			return error;
345 		}
346 	}
347 
348 	/*
349 	 * Block device opened successfully, finish initializing the
350 	 * mount structure.
351 	 *
352 	 * From this point on we have to call hammer2_unmount() on failure.
353 	 */
354 	pmp = kmalloc(sizeof(*pmp), M_HAMMER2, M_WAITOK | M_ZERO);
355 	mp->mnt_data = (qaddr_t)pmp;
356 	pmp->mp = mp;
357 
358 	spin_init(&pmp->inum_spin);
359 	RB_INIT(&pmp->inum_tree);
360 
361 	kmalloc_create(&pmp->mmsg, "HAMMER2-pfsmsg");
362 	kdmsg_iocom_init(&pmp->iocom, pmp,
363 			 KDMSG_IOCOMF_AUTOCONN |
364 			 KDMSG_IOCOMF_AUTOSPAN |
365 			 KDMSG_IOCOMF_AUTOCIRC,
366 			 pmp->mmsg, hammer2_rcvdmsg);
367 
368 	if (create_hmp) {
369 		hmp = kmalloc(sizeof(*hmp), M_HAMMER2, M_WAITOK | M_ZERO);
370 		hmp->ronly = ronly;
371 		hmp->devvp = devvp;
372 		kmalloc_create(&hmp->minode, "HAMMER2-inodes");
373 		kmalloc_create(&hmp->mchain, "HAMMER2-chains");
374 		TAILQ_INSERT_TAIL(&hammer2_mntlist, hmp, mntentry);
375 	}
376 	ccms_domain_init(&pmp->ccms_dom);
377 	pmp->hmp = hmp;
378 	++hmp->pmp_count;
379 	lockmgr(&hammer2_mntlk, LK_RELEASE);
380 	kprintf("hammer2_mount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
381 
382 	mp->mnt_flag = MNT_LOCAL;
383 	mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;	/* all entry pts are SMP */
384 
385 	if (create_hmp) {
386 		/*
387 		 * Presetup
388 		 */
389 		lockinit(&hmp->alloclk, "h2alloc", 0, 0);
390 		lockinit(&hmp->voldatalk, "voldata", 0, LK_CANRECURSE);
391 		TAILQ_INIT(&hmp->transq);
392 
393 		/*
394 		 * vchain setup. vchain.data is special cased to NULL.
395 		 * vchain.refs is initialized and will never drop to 0.
396 		 */
397 		hmp->vchain.hmp = hmp;
398 		hmp->vchain.refs = 1;
399 		hmp->vchain.data = (void *)&hmp->voldata;
400 		hmp->vchain.bref.type = HAMMER2_BREF_TYPE_VOLUME;
401 		hmp->vchain.bref.data_off = 0 | HAMMER2_PBUFRADIX;
402 		hmp->vchain.delete_tid = HAMMER2_MAX_TID;
403 		hammer2_chain_core_alloc(&hmp->vchain, NULL);
404 		/* hmp->vchain.u.xxx is left NULL */
405 
406 		/*
407 		 * Install the volume header
408 		 */
409 		error = hammer2_install_volume_header(hmp);
410 		if (error) {
411 			hammer2_vfs_unmount(mp, MNT_FORCE);
412 			return error;
413 		}
414 	}
415 
416 	/*
417 	 * required mount structure initializations
418 	 */
419 	mp->mnt_stat.f_iosize = HAMMER2_PBUFSIZE;
420 	mp->mnt_stat.f_bsize = HAMMER2_PBUFSIZE;
421 
422 	mp->mnt_vstat.f_frsize = HAMMER2_PBUFSIZE;
423 	mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
424 
425 	/*
426 	 * Optional fields
427 	 */
428 	mp->mnt_iosize_max = MAXPHYS;
429 
430 	/*
431 	 * First locate the super-root inode, which is key 0 relative to the
432 	 * volume header's blockset.
433 	 *
434 	 * Then locate the root inode by scanning the directory keyspace
435 	 * represented by the label.
436 	 */
437 	if (create_hmp) {
438 		parent = hammer2_chain_lookup_init(&hmp->vchain, 0);
439 		schain = hammer2_chain_lookup(&parent,
440 				      HAMMER2_SROOT_KEY, HAMMER2_SROOT_KEY, 0);
441 		hammer2_chain_lookup_done(parent);
442 		if (schain == NULL) {
443 			kprintf("hammer2_mount: invalid super-root\n");
444 			hammer2_vfs_unmount(mp, MNT_FORCE);
445 			return EINVAL;
446 		}
447 		hammer2_chain_ref(schain);	/* for hmp->schain */
448 		hmp->schain = schain;		/* left locked for inode_get */
449 		hmp->sroot = hammer2_inode_get(hmp, NULL, NULL, schain);
450 		hammer2_inode_ref(hmp->sroot);	     /* for hmp->sroot */
451 		hammer2_inode_unlock_ex(hmp->sroot, schain);
452 	} else {
453 		schain = hmp->schain;
454 	}
455 
456 	/*
457 	 * schain only has 1 ref now for its hmp->schain assignment.
458 	 * Setup for lookup (which will lock it).
459 	 */
460 	parent = hammer2_chain_lookup_init(schain, 0);
461 	lhc = hammer2_dirhash(label, strlen(label));
462 	rchain = hammer2_chain_lookup(&parent,
463 				      lhc, lhc + HAMMER2_DIRHASH_LOMASK,
464 				      0);
465 	while (rchain) {
466 		if (rchain->bref.type == HAMMER2_BREF_TYPE_INODE &&
467 		    strcmp(label, rchain->data->ipdata.filename) == 0) {
468 			break;
469 		}
470 		rchain = hammer2_chain_next(&parent, rchain,
471 					    lhc, lhc + HAMMER2_DIRHASH_LOMASK,
472 					    0);
473 	}
474 	hammer2_chain_lookup_done(parent);
475 	if (rchain == NULL) {
476 		kprintf("hammer2_mount: PFS label not found\n");
477 		hammer2_vfs_unmount(mp, MNT_FORCE);
478 		return EINVAL;
479 	}
480 	if (rchain->flags & HAMMER2_CHAIN_MOUNTED) {
481 		hammer2_chain_unlock(rchain);
482 		kprintf("hammer2_mount: PFS label already mounted!\n");
483 		hammer2_vfs_unmount(mp, MNT_FORCE);
484 		return EBUSY;
485 	}
486 	if (rchain->flags & HAMMER2_CHAIN_RECYCLE) {
487 		kprintf("hammer2_mount: PFS label currently recycling\n");
488 		hammer2_vfs_unmount(mp, MNT_FORCE);
489 		return EBUSY;
490 	}
491 
492 	atomic_set_int(&rchain->flags, HAMMER2_CHAIN_MOUNTED);
493 
494 	/*
495 	 * NOTE: *_get() integrates chain's lock into the inode lock.
496 	 */
497 	hammer2_chain_ref(rchain);		/* for pmp->rchain */
498 	pmp->rchain = rchain;			/* left held & unlocked */
499 	pmp->iroot = hammer2_inode_get(hmp, pmp, NULL, rchain);
500 	hammer2_inode_ref(pmp->iroot);		/* ref for pmp->iroot */
501 	hammer2_inode_unlock_ex(pmp->iroot, rchain);
502 
503 	kprintf("iroot %p\n", pmp->iroot);
504 
505 	/*
506 	 * Ref the cluster management messaging descriptor.  The mount
507 	 * program deals with the other end of the communications pipe.
508 	 */
509 	fp = holdfp(curproc->p_fd, info.cluster_fd, -1);
510 	if (fp == NULL) {
511 		kprintf("hammer2_mount: bad cluster_fd!\n");
512 		hammer2_vfs_unmount(mp, MNT_FORCE);
513 		return EBADF;
514 	}
515 	hammer2_cluster_reconnect(pmp, fp);
516 
517 	/*
518 	 * Finish setup
519 	 */
520 	vfs_getnewfsid(mp);
521 	vfs_add_vnodeops(mp, &hammer2_vnode_vops, &mp->mnt_vn_norm_ops);
522 	vfs_add_vnodeops(mp, &hammer2_spec_vops, &mp->mnt_vn_spec_ops);
523 	vfs_add_vnodeops(mp, &hammer2_fifo_vops, &mp->mnt_vn_fifo_ops);
524 
525 	copyinstr(info.volume, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
526 	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
527 	bzero(mp->mnt_stat.f_mntonname, sizeof(mp->mnt_stat.f_mntonname));
528 	copyinstr(path, mp->mnt_stat.f_mntonname,
529 		  sizeof(mp->mnt_stat.f_mntonname) - 1,
530 		  &size);
531 
532 	/*
533 	 * Initial statfs to prime mnt_stat.
534 	 */
535 	hammer2_vfs_statfs(mp, &mp->mnt_stat, cred);
536 
537 	return 0;
538 }
539 
540 static
541 int
542 hammer2_remount(struct mount *mp, char *path, struct vnode *devvp,
543                 struct ucred *cred)
544 {
545 	return (0);
546 }
547 
548 static
549 int
550 hammer2_vfs_unmount(struct mount *mp, int mntflags)
551 {
552 	hammer2_pfsmount_t *pmp;
553 	hammer2_mount_t *hmp;
554 	int flags;
555 	int error = 0;
556 	int ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
557 	int dumpcnt;
558 	struct vnode *devvp;
559 
560 	pmp = MPTOPMP(mp);
561 	hmp = pmp->hmp;
562 	flags = 0;
563 
564 	if (mntflags & MNT_FORCE)
565 		flags |= FORCECLOSE;
566 
567 	hammer2_mount_exlock(hmp);
568 
569 	/*
570 	 * If mount initialization proceeded far enough we must flush
571 	 * its vnodes.
572 	 */
573 	if (pmp->iroot)
574 		error = vflush(mp, 0, flags);
575 
576 	if (error) {
577 		hammer2_mount_unlock(hmp);
578 		return error;
579 	}
580 
581 	lockmgr(&hammer2_mntlk, LK_EXCLUSIVE);
582 	--hmp->pmp_count;
583 	kprintf("hammer2_unmount hmp=%p pmpcnt=%d\n", hmp, hmp->pmp_count);
584 
585 	/*
586 	 * Flush any left over chains.  The voldata lock is only used
587 	 * to synchronize against HAMMER2_CHAIN_MODIFIED_AUX.
588 	 */
589 	hammer2_voldata_lock(hmp);
590 	if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
591 				 HAMMER2_CHAIN_SUBMODIFIED)) {
592 		hammer2_voldata_unlock(hmp, 0);
593 		hammer2_vfs_sync(mp, MNT_WAIT);
594 	} else {
595 		hammer2_voldata_unlock(hmp, 0);
596 	}
597 	if (hmp->pmp_count == 0) {
598 		if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
599 					 HAMMER2_CHAIN_SUBMODIFIED)) {
600 			kprintf("hammer2_unmount: chains left over after "
601 				"final sync\n");
602 			if (hammer2_debug & 0x0010)
603 				Debugger("entered debugger");
604 		}
605 	}
606 
607 	/*
608 	 * Cleanup the root and super-root chain elements (which should be
609 	 * clean).
610 	 */
611 	if (pmp->iroot) {
612 #if REPORT_REFS_ERRORS
613 		if (pmp->iroot->refs != 1)
614 			kprintf("PMP->IROOT %p REFS WRONG %d\n",
615 				pmp->iroot, pmp->iroot->refs);
616 #else
617 		KKASSERT(pmp->iroot->refs == 1);
618 #endif
619 		hammer2_inode_drop(pmp->iroot);	    /* ref for pmp->iroot */
620 		pmp->iroot = NULL;
621 	}
622 	if (pmp->rchain) {
623 		atomic_clear_int(&pmp->rchain->flags, HAMMER2_CHAIN_MOUNTED);
624 #if REPORT_REFS_ERRORS
625 		if (pmp->rchain->refs != 1)
626 			kprintf("PMP->RCHAIN %p REFS WRONG %d\n",
627 				pmp->rchain, pmp->rchain->refs);
628 #else
629 		KKASSERT(pmp->rchain->refs == 1);
630 #endif
631 		hammer2_chain_drop(pmp->rchain);
632 		pmp->rchain = NULL;
633 	}
634 	ccms_domain_uninit(&pmp->ccms_dom);
635 
636 	/*
637 	 * Kill cluster controller
638 	 */
639 	kdmsg_iocom_uninit(&pmp->iocom);
640 
641 	/*
642 	 * If no PFS's left drop the master hammer2_mount for the device.
643 	 */
644 	if (hmp->pmp_count == 0) {
645 		if (hmp->sroot) {
646 			hammer2_inode_drop(hmp->sroot);
647 			hmp->sroot = NULL;
648 		}
649 		if (hmp->schain) {
650 #if REPORT_REFS_ERRORS
651 			if (hmp->schain->refs != 1)
652 				kprintf("HMP->SCHAIN %p REFS WRONG %d\n",
653 					hmp->schain, hmp->schain->refs);
654 #else
655 			KKASSERT(hmp->schain->refs == 1);
656 #endif
657 			hammer2_chain_drop(hmp->schain);
658 			hmp->schain = NULL;
659 		}
660 
661 		/*
662 		 * Finish up with the device vnode
663 		 */
664 		if ((devvp = hmp->devvp) != NULL) {
665 			vinvalbuf(devvp, (ronly ? 0 : V_SAVE), 0, 0);
666 			hmp->devvp = NULL;
667 			VOP_CLOSE(devvp, (ronly ? FREAD : FREAD|FWRITE));
668 			vrele(devvp);
669 			devvp = NULL;
670 		}
671 
672 		/*
673 		 * Final drop of embedded volume root chain to clean up
674 		 * vchain.core (vchain structure is not flagged ALLOCATED
675 		 * so it is cleaned out and then left).
676 		 */
677 		dumpcnt = 50;
678 		hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
679 		hammer2_mount_unlock(hmp);
680 		hammer2_chain_drop(&hmp->vchain);
681 	} else {
682 		hammer2_mount_unlock(hmp);
683 	}
684 
685 	pmp->mp = NULL;
686 	pmp->hmp = NULL;
687 	mp->mnt_data = NULL;
688 
689 	kmalloc_destroy(&pmp->mmsg);
690 
691 	kfree(pmp, M_HAMMER2);
692 	if (hmp->pmp_count == 0) {
693 		TAILQ_REMOVE(&hammer2_mntlist, hmp, mntentry);
694 		kmalloc_destroy(&hmp->minode);
695 		kmalloc_destroy(&hmp->mchain);
696 		kfree(hmp, M_HAMMER2);
697 	}
698 	lockmgr(&hammer2_mntlk, LK_RELEASE);
699 	return (error);
700 }
701 
702 static
703 int
704 hammer2_vfs_vget(struct mount *mp, struct vnode *dvp,
705 	     ino_t ino, struct vnode **vpp)
706 {
707 	kprintf("hammer2_vget\n");
708 	return (EOPNOTSUPP);
709 }
710 
711 static
712 int
713 hammer2_vfs_root(struct mount *mp, struct vnode **vpp)
714 {
715 	hammer2_pfsmount_t *pmp;
716 	hammer2_mount_t *hmp;
717 	hammer2_chain_t *parent;
718 	int error;
719 	struct vnode *vp;
720 
721 	pmp = MPTOPMP(mp);
722 	hmp = pmp->hmp;
723 	hammer2_mount_exlock(hmp);
724 	if (pmp->iroot == NULL) {
725 		*vpp = NULL;
726 		error = EINVAL;
727 	} else {
728 		parent = hammer2_inode_lock_sh(pmp->iroot);
729 		vp = hammer2_igetv(pmp->iroot, &error);
730 		hammer2_inode_unlock_sh(pmp->iroot, parent);
731 		*vpp = vp;
732 		if (vp == NULL)
733 			kprintf("vnodefail\n");
734 	}
735 	hammer2_mount_unlock(hmp);
736 
737 	return (error);
738 }
739 
740 /*
741  * Filesystem status
742  *
743  * XXX incorporate ipdata->inode_quota and data_quota
744  */
745 static
746 int
747 hammer2_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
748 {
749 	hammer2_pfsmount_t *pmp;
750 	hammer2_mount_t *hmp;
751 
752 	pmp = MPTOPMP(mp);
753 	hmp = MPTOHMP(mp);
754 
755 	mp->mnt_stat.f_files = pmp->inode_count;
756 	mp->mnt_stat.f_ffree = 0;
757 	mp->mnt_stat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
758 	mp->mnt_stat.f_bfree = (hmp->voldata.allocator_size -
759 				hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
760 	mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
761 
762 	*sbp = mp->mnt_stat;
763 	return (0);
764 }
765 
766 static
767 int
768 hammer2_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
769 {
770 	hammer2_pfsmount_t *pmp;
771 	hammer2_mount_t *hmp;
772 
773 	pmp = MPTOPMP(mp);
774 	hmp = MPTOHMP(mp);
775 
776 	mp->mnt_vstat.f_bsize = HAMMER2_PBUFSIZE;
777 	mp->mnt_vstat.f_files = pmp->inode_count;
778 	mp->mnt_vstat.f_ffree = 0;
779 	mp->mnt_vstat.f_blocks = hmp->voldata.allocator_size / HAMMER2_PBUFSIZE;
780 	mp->mnt_vstat.f_bfree = (hmp->voldata.allocator_size -
781 				 hmp->voldata.allocator_beg) / HAMMER2_PBUFSIZE;
782 	mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
783 
784 	*sbp = mp->mnt_vstat;
785 	return (0);
786 }
787 
788 /*
789  * Sync the entire filesystem; this is called from the filesystem syncer
790  * process periodically and whenever a user calls sync(1) on the hammer
791  * mountpoint.
792  *
793  * Currently is actually called from the syncer! \o/
794  *
795  * This task will have to snapshot the state of the dirty inode chain.
796  * From that, it will have to make sure all of the inodes on the dirty
797  * chain have IO initiated. We make sure that io is initiated for the root
798  * block.
799  *
800  * If waitfor is set, we wait for media to acknowledge the new rootblock.
801  *
802  * THINKS: side A vs side B, to have sync not stall all I/O?
803  */
804 static
805 int
806 hammer2_vfs_sync(struct mount *mp, int waitfor)
807 {
808 	struct hammer2_sync_info info;
809 	hammer2_mount_t *hmp;
810 	int flags;
811 	int error;
812 	int i;
813 #if 0
814 	int dumpcnt;
815 #endif
816 
817 	hmp = MPTOHMP(mp);
818 #if 0
819 	if ((waitfor & MNT_LAZY) == 0) {
820 		dumpcnt = 50;
821 		hammer2_dump_chain(&hmp->vchain, 0, &dumpcnt);
822 	}
823 #endif
824 
825 	flags = VMSC_GETVP;
826 	if (waitfor & MNT_LAZY)
827 		flags |= VMSC_ONEPASS;
828 
829 	hammer2_trans_init(hmp, &info.trans, HAMMER2_TRANS_ISFLUSH);
830 
831 	info.error = 0;
832 	info.waitfor = MNT_NOWAIT;
833 	vmntvnodescan(mp, flags | VMSC_NOWAIT,
834 		      hammer2_sync_scan1,
835 		      hammer2_sync_scan2, &info);
836 	if (info.error == 0 && (waitfor & MNT_WAIT)) {
837 		info.waitfor = waitfor;
838 		    vmntvnodescan(mp, flags,
839 				  hammer2_sync_scan1,
840 				  hammer2_sync_scan2, &info);
841 
842 	}
843 #if 0
844 	if (waitfor == MNT_WAIT) {
845 		/* XXX */
846 	} else {
847 		/* XXX */
848 	}
849 #endif
850 	/*
851 	 * Rollup flush.  The fsyncs above basically just flushed
852 	 * data blocks.  The flush below gets all the meta-data.
853 	 */
854 	hammer2_chain_lock(&hmp->vchain, HAMMER2_RESOLVE_ALWAYS);
855 	if (hmp->vchain.flags & (HAMMER2_CHAIN_MODIFIED |
856 				 HAMMER2_CHAIN_SUBMODIFIED)) {
857 		hammer2_chain_flush(&info.trans, &hmp->vchain);
858 	}
859 	hammer2_chain_unlock(&hmp->vchain);
860 
861 	error = 0;
862 
863 	/*
864 	 * We can't safely flush the volume header until we have
865 	 * flushed any device buffers which have built up.
866 	 *
867 	 * XXX this isn't being incremental
868 	 */
869 	vn_lock(hmp->devvp, LK_EXCLUSIVE | LK_RETRY);
870 	error = VOP_FSYNC(hmp->devvp, MNT_WAIT, 0);
871 	vn_unlock(hmp->devvp);
872 
873 	/*
874 	 * The flush code sets CHAIN_VOLUMESYNC to indicate that the
875 	 * volume header needs synchronization via hmp->volsync.
876 	 *
877 	 * XXX synchronize the flag & data with only this flush XXX
878 	 */
879 	if (error == 0 && (hmp->vchain.flags & HAMMER2_CHAIN_VOLUMESYNC)) {
880 		struct buf *bp;
881 
882 		/*
883 		 * Synchronize the disk before flushing the volume
884 		 * header.
885 		 */
886 		bp = getpbuf(NULL);
887 		bp->b_bio1.bio_offset = 0;
888 		bp->b_bufsize = 0;
889 		bp->b_bcount = 0;
890 		bp->b_cmd = BUF_CMD_FLUSH;
891 		bp->b_bio1.bio_done = biodone_sync;
892 		bp->b_bio1.bio_flags |= BIO_SYNC;
893 		vn_strategy(hmp->devvp, &bp->b_bio1);
894 		biowait(&bp->b_bio1, "h2vol");
895 		relpbuf(bp, NULL);
896 
897 		/*
898 		 * Then we can safely flush the version of the volume header
899 		 * synchronized by the flush code.
900 		 */
901 		i = hmp->volhdrno + 1;
902 		if (i >= HAMMER2_NUM_VOLHDRS)
903 			i = 0;
904 		if (i * HAMMER2_ZONE_BYTES64 + HAMMER2_SEGSIZE >
905 		    hmp->volsync.volu_size) {
906 			i = 0;
907 		}
908 		kprintf("sync volhdr %d %jd\n",
909 			i, (intmax_t)hmp->volsync.volu_size);
910 		bp = getblk(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
911 			    HAMMER2_PBUFSIZE, 0, 0);
912 		atomic_clear_int(&hmp->vchain.flags, HAMMER2_CHAIN_VOLUMESYNC);
913 		bcopy(&hmp->volsync, bp->b_data, HAMMER2_PBUFSIZE);
914 		bawrite(bp);
915 		hmp->volhdrno = i;
916 	}
917 	hammer2_trans_done(&info.trans);
918 	return (error);
919 }
920 
921 /*
922  * Sync passes.
923  *
924  * NOTE: We don't test SUBMODIFIED or MOVED here because the fsync code
925  *	 won't flush on those flags.  The syncer code above will do a
926  *	 general meta-data flush globally that will catch these flags.
927  */
928 static int
929 hammer2_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
930 {
931 	hammer2_inode_t *ip;
932 
933 	ip = VTOI(vp);
934 	if (vp->v_type == VNON || ip == NULL ||
935 	    ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
936 	     RB_EMPTY(&vp->v_rbdirty_tree))) {
937 		return(-1);
938 	}
939 	return(0);
940 }
941 
942 static int
943 hammer2_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
944 {
945 	struct hammer2_sync_info *info = data;
946 	hammer2_inode_t *ip;
947 	hammer2_chain_t *parent;
948 	int error;
949 
950 	ip = VTOI(vp);
951 	if (vp->v_type == VNON || vp->v_type == VBAD ||
952 	    ((ip->flags & HAMMER2_INODE_MODIFIED) == 0 &&
953 	     RB_EMPTY(&vp->v_rbdirty_tree))) {
954 		return(0);
955 	}
956 
957 	/*
958 	 * VOP_FSYNC will start a new transaction so replicate some code
959 	 * here to do it inline (see hammer2_vop_fsync()).
960 	 */
961 	parent = hammer2_inode_lock_ex(ip);
962 	atomic_clear_int(&ip->flags, HAMMER2_INODE_MODIFIED);
963 	if (ip->vp)
964 		vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL);
965 	hammer2_chain_flush(&info->trans, parent);
966 	hammer2_inode_unlock_ex(ip, parent);
967 	error = 0;
968 #if 0
969 	error = VOP_FSYNC(vp, MNT_NOWAIT, 0);
970 #endif
971 	if (error)
972 		info->error = error;
973 	return(0);
974 }
975 
976 static
977 int
978 hammer2_vfs_vptofh(struct vnode *vp, struct fid *fhp)
979 {
980 	return (0);
981 }
982 
983 static
984 int
985 hammer2_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
986 	       struct fid *fhp, struct vnode **vpp)
987 {
988 	return (0);
989 }
990 
991 static
992 int
993 hammer2_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
994 		 int *exflagsp, struct ucred **credanonp)
995 {
996 	return (0);
997 }
998 
999 /*
1000  * Support code for hammer2_mount().  Read, verify, and install the volume
1001  * header into the HMP
1002  *
1003  * XXX read four volhdrs and use the one with the highest TID whos CRC
1004  *     matches.
1005  *
1006  * XXX check iCRCs.
1007  *
1008  * XXX For filesystems w/ less than 4 volhdrs, make sure to not write to
1009  *     nonexistant locations.
1010  *
1011  * XXX Record selected volhdr and ring updates to each of 4 volhdrs
1012  */
1013 static
1014 int
1015 hammer2_install_volume_header(hammer2_mount_t *hmp)
1016 {
1017 	hammer2_volume_data_t *vd;
1018 	struct buf *bp;
1019 	hammer2_crc32_t crc0, crc, bcrc0, bcrc;
1020 	int error_reported;
1021 	int error;
1022 	int valid;
1023 	int i;
1024 
1025 	error_reported = 0;
1026 	error = 0;
1027 	valid = 0;
1028 	bp = NULL;
1029 
1030 	/*
1031 	 * There are up to 4 copies of the volume header (syncs iterate
1032 	 * between them so there is no single master).  We don't trust the
1033 	 * volu_size field so we don't know precisely how large the filesystem
1034 	 * is, so depend on the OS to return an error if we go beyond the
1035 	 * block device's EOF.
1036 	 */
1037 	for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
1038 		error = bread(hmp->devvp, i * HAMMER2_ZONE_BYTES64,
1039 			      HAMMER2_VOLUME_BYTES, &bp);
1040 		if (error) {
1041 			brelse(bp);
1042 			bp = NULL;
1043 			continue;
1044 		}
1045 
1046 		vd = (struct hammer2_volume_data *) bp->b_data;
1047 		if ((vd->magic != HAMMER2_VOLUME_ID_HBO) &&
1048 		    (vd->magic != HAMMER2_VOLUME_ID_ABO)) {
1049 			brelse(bp);
1050 			bp = NULL;
1051 			continue;
1052 		}
1053 
1054 		if (vd->magic == HAMMER2_VOLUME_ID_ABO) {
1055 			/* XXX: Reversed-endianness filesystem */
1056 			kprintf("hammer2: reverse-endian filesystem detected");
1057 			brelse(bp);
1058 			bp = NULL;
1059 			continue;
1060 		}
1061 
1062 		crc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT0];
1063 		crc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC0_OFF,
1064 				      HAMMER2_VOLUME_ICRC0_SIZE);
1065 		bcrc = vd->icrc_sects[HAMMER2_VOL_ICRC_SECT1];
1066 		bcrc0 = hammer2_icrc32(bp->b_data + HAMMER2_VOLUME_ICRC1_OFF,
1067 				       HAMMER2_VOLUME_ICRC1_SIZE);
1068 		if ((crc0 != crc) || (bcrc0 != bcrc)) {
1069 			kprintf("hammer2 volume header crc "
1070 				"mismatch copy #%d %08x/%08x\n",
1071 				i, crc0, crc);
1072 			error_reported = 1;
1073 			brelse(bp);
1074 			bp = NULL;
1075 			continue;
1076 		}
1077 		if (valid == 0 || hmp->voldata.mirror_tid < vd->mirror_tid) {
1078 			valid = 1;
1079 			hmp->voldata = *vd;
1080 			hmp->volhdrno = i;
1081 		}
1082 		brelse(bp);
1083 		bp = NULL;
1084 	}
1085 	if (valid) {
1086 		hmp->volsync = hmp->voldata;
1087 		error = 0;
1088 		if (error_reported || bootverbose || 1) { /* 1/DEBUG */
1089 			kprintf("hammer2: using volume header #%d\n",
1090 				hmp->volhdrno);
1091 		}
1092 	} else {
1093 		error = EINVAL;
1094 		kprintf("hammer2: no valid volume headers found!\n");
1095 	}
1096 	return (error);
1097 }
1098 
1099 /*
1100  * Reconnect using the passed file pointer.  The caller must ref the
1101  * fp for us.
1102  */
1103 void
1104 hammer2_cluster_reconnect(hammer2_pfsmount_t *pmp, struct file *fp)
1105 {
1106 	hammer2_inode_data_t *ipdata;
1107 	hammer2_chain_t *parent;
1108 	size_t name_len;
1109 
1110 	/*
1111 	 * Closes old comm descriptor, kills threads, cleans up
1112 	 * states, then installs the new descriptor and creates
1113 	 * new threads.
1114 	 */
1115 	kdmsg_iocom_reconnect(&pmp->iocom, fp, "hammer2");
1116 
1117 	/*
1118 	 * Setup LNK_CONN fields for autoinitiated state machine
1119 	 */
1120 	parent = hammer2_inode_lock_ex(pmp->iroot);
1121 	ipdata = &parent->data->ipdata;
1122 	pmp->iocom.auto_lnk_conn.pfs_clid = ipdata->pfs_clid;
1123 	pmp->iocom.auto_lnk_conn.pfs_fsid = ipdata->pfs_fsid;
1124 	pmp->iocom.auto_lnk_conn.pfs_type = ipdata->pfs_type;
1125 	pmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
1126 	pmp->iocom.auto_lnk_conn.peer_type = pmp->hmp->voldata.peer_type;
1127 
1128 	/*
1129 	 * Filter adjustment.  Clients do not need visibility into other
1130 	 * clients (otherwise millions of clients would present a serious
1131 	 * problem).  The fs_label also serves to restrict the namespace.
1132 	 */
1133 	pmp->iocom.auto_lnk_conn.peer_mask = 1LLU << HAMMER2_PEER_HAMMER2;
1134 	pmp->iocom.auto_lnk_conn.pfs_mask = (uint64_t)-1;
1135 	switch (ipdata->pfs_type) {
1136 	case DMSG_PFSTYPE_CLIENT:
1137 		pmp->iocom.auto_lnk_conn.peer_mask &=
1138 				~(1LLU << DMSG_PFSTYPE_CLIENT);
1139 		break;
1140 	default:
1141 		break;
1142 	}
1143 
1144 	name_len = ipdata->name_len;
1145 	if (name_len >= sizeof(pmp->iocom.auto_lnk_conn.fs_label))
1146 		name_len = sizeof(pmp->iocom.auto_lnk_conn.fs_label) - 1;
1147 	bcopy(ipdata->filename,
1148 	      pmp->iocom.auto_lnk_conn.fs_label,
1149 	      name_len);
1150 	pmp->iocom.auto_lnk_conn.fs_label[name_len] = 0;
1151 
1152 	/*
1153 	 * Setup LNK_SPAN fields for autoinitiated state machine
1154 	 */
1155 	pmp->iocom.auto_lnk_span.pfs_clid = ipdata->pfs_clid;
1156 	pmp->iocom.auto_lnk_span.pfs_fsid = ipdata->pfs_fsid;
1157 	pmp->iocom.auto_lnk_span.pfs_type = ipdata->pfs_type;
1158 	pmp->iocom.auto_lnk_span.peer_type = pmp->hmp->voldata.peer_type;
1159 	pmp->iocom.auto_lnk_span.proto_version = DMSG_SPAN_PROTO_1;
1160 	name_len = ipdata->name_len;
1161 	if (name_len >= sizeof(pmp->iocom.auto_lnk_span.fs_label))
1162 		name_len = sizeof(pmp->iocom.auto_lnk_span.fs_label) - 1;
1163 	bcopy(ipdata->filename,
1164 	      pmp->iocom.auto_lnk_span.fs_label,
1165 	      name_len);
1166 	pmp->iocom.auto_lnk_span.fs_label[name_len] = 0;
1167 	hammer2_inode_unlock_ex(pmp->iroot, parent);
1168 
1169 	kdmsg_iocom_autoinitiate(&pmp->iocom, hammer2_autodmsg);
1170 }
1171 
1172 static int
1173 hammer2_rcvdmsg(kdmsg_msg_t *msg)
1174 {
1175 	switch(msg->any.head.cmd & DMSGF_TRANSMASK) {
1176 	case DMSG_DBG_SHELL:
1177 		/*
1178 		 * (non-transaction)
1179 		 * Execute shell command (not supported atm)
1180 		 */
1181 		kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1182 		break;
1183 	case DMSG_DBG_SHELL | DMSGF_REPLY:
1184 		/*
1185 		 * (non-transaction)
1186 		 */
1187 		if (msg->aux_data) {
1188 			msg->aux_data[msg->aux_size - 1] = 0;
1189 			kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
1190 		}
1191 		break;
1192 	default:
1193 		/*
1194 		 * Unsupported message received.  We only need to
1195 		 * reply if it's a transaction in order to close our end.
1196 		 * Ignore any one-way messages are any further messages
1197 		 * associated with the transaction.
1198 		 *
1199 		 * NOTE: This case also includes DMSG_LNK_ERROR messages
1200 		 *	 which might be one-way, replying to those would
1201 		 *	 cause an infinite ping-pong.
1202 		 */
1203 		if (msg->any.head.cmd & DMSGF_CREATE)
1204 			kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
1205 		break;
1206 	}
1207 	return(0);
1208 }
1209 
1210 /*
1211  * This function is called after KDMSG has automatically handled processing
1212  * of a LNK layer message (typically CONN, SPAN, or CIRC).
1213  *
1214  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
1215  * advertises all available hammer2 super-root volumes.
1216  */
1217 static void
1218 hammer2_autodmsg(kdmsg_msg_t *msg)
1219 {
1220 	hammer2_pfsmount_t *pmp = msg->iocom->handle;
1221 	hammer2_mount_t *hmp = pmp->hmp;
1222 	int copyid;
1223 
1224 	/*
1225 	 * We only care about replies to our LNK_CONN auto-request.  kdmsg
1226 	 * has already processed the reply, we use this calback as a shim
1227 	 * to know when we can advertise available super-root volumes.
1228 	 */
1229 	if ((msg->any.head.cmd & DMSGF_TRANSMASK) !=
1230 	    (DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY) ||
1231 	    msg->state == NULL) {
1232 		return;
1233 	}
1234 
1235 	kprintf("LNK_CONN REPLY RECEIVED CMD %08x\n", msg->any.head.cmd);
1236 
1237 	if (msg->any.head.cmd & DMSGF_CREATE) {
1238 		kprintf("HAMMER2: VOLDATA DUMP\n");
1239 
1240 		/*
1241 		 * Dump the configuration stored in the volume header
1242 		 */
1243 		hammer2_voldata_lock(hmp);
1244 		for (copyid = 0; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
1245 			if (hmp->voldata.copyinfo[copyid].copyid == 0)
1246 				continue;
1247 			hammer2_volconf_update(pmp, copyid);
1248 		}
1249 		hammer2_voldata_unlock(hmp, 0);
1250 	}
1251 	if ((msg->any.head.cmd & DMSGF_DELETE) &&
1252 	    msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
1253 		kprintf("HAMMER2: CONN WAS TERMINATED\n");
1254 	}
1255 }
1256 
1257 /*
1258  * Volume configuration updates are passed onto the userland service
1259  * daemon via the open LNK_CONN transaction.
1260  */
1261 void
1262 hammer2_volconf_update(hammer2_pfsmount_t *pmp, int index)
1263 {
1264 	hammer2_mount_t *hmp = pmp->hmp;
1265 	kdmsg_msg_t *msg;
1266 
1267 	/* XXX interlock against connection state termination */
1268 	kprintf("volconf update %p\n", pmp->iocom.conn_state);
1269 	if (pmp->iocom.conn_state) {
1270 		kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
1271 		msg = kdmsg_msg_alloc_state(pmp->iocom.conn_state,
1272 					    DMSG_LNK_VOLCONF, NULL, NULL);
1273 		msg->any.lnk_volconf.copy = hmp->voldata.copyinfo[index];
1274 		msg->any.lnk_volconf.mediaid = hmp->voldata.fsid;
1275 		msg->any.lnk_volconf.index = index;
1276 		kdmsg_msg_write(msg);
1277 	}
1278 }
1279 
1280 void
1281 hammer2_dump_chain(hammer2_chain_t *chain, int tab, int *countp)
1282 {
1283 	hammer2_chain_t *scan;
1284 
1285 	--*countp;
1286 	if (*countp == 0) {
1287 		kprintf("%*.*s...\n", tab, tab, "");
1288 		return;
1289 	}
1290 	if (*countp < 0)
1291 		return;
1292 	kprintf("%*.*schain[%d] %p.%d [%08x][core=%p] (%s) dl=%p dt=%s refs=%d",
1293 		tab, tab, "",
1294 		chain->index, chain, chain->bref.type, chain->flags,
1295 		chain->core,
1296 		((chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
1297 		chain->data) ?  (char *)chain->data->ipdata.filename : "?"),
1298 		chain->next_parent,
1299 		(chain->delete_tid == HAMMER2_MAX_TID ? "max" : "fls"),
1300 		chain->refs);
1301 	if (chain->core == NULL || RB_EMPTY(&chain->core->rbtree))
1302 		kprintf("\n");
1303 	else
1304 		kprintf(" {\n");
1305 	RB_FOREACH(scan, hammer2_chain_tree, &chain->core->rbtree) {
1306 		hammer2_dump_chain(scan, tab + 4, countp);
1307 	}
1308 	if (chain->core && !RB_EMPTY(&chain->core->rbtree)) {
1309 		if (chain->bref.type == HAMMER2_BREF_TYPE_INODE && chain->data)
1310 			kprintf("%*.*s}(%s)\n", tab, tab, "",
1311 				chain->data->ipdata.filename);
1312 		else
1313 			kprintf("%*.*s}\n", tab, tab, "");
1314 	}
1315 }
1316