1 /* $NetBSD: coda_vfsops.c,v 1.84 2014/12/13 15:59:30 hannken Exp $ */
2
3 /*
4 *
5 * Coda: an Experimental Distributed File System
6 * Release 3.1
7 *
8 * Copyright (c) 1987-1998 Carnegie Mellon University
9 * All Rights Reserved
10 *
11 * Permission to use, copy, modify and distribute this software and its
12 * documentation is hereby granted, provided that both the copyright
13 * notice and this permission notice appear in all copies of the
14 * software, derivative works or modified versions, and any portions
15 * thereof, and that both notices appear in supporting documentation, and
16 * that credit is given to Carnegie Mellon University in all documents
17 * and publicity pertaining to direct or indirect use of this code or its
18 * derivatives.
19 *
20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
25 * ANY DERIVATIVE WORK.
26 *
27 * Carnegie Mellon encourages users of this software to return any
28 * improvements or extensions that they make, and to grant Carnegie
29 * Mellon the rights to redistribute these changes without encumbrance.
30 *
31 * @(#) cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:26:45 rvb Exp $
32 */
33
34 /*
35 * Mach Operating System
36 * Copyright (c) 1989 Carnegie-Mellon University
37 * All rights reserved. The CMU software License Agreement specifies
38 * the terms and conditions for use and redistribution.
39 */
40
41 /*
42 * This code was written for the Coda file system at Carnegie Mellon
43 * University. Contributers include David Steere, James Kistler, and
44 * M. Satyanarayanan.
45 */
46
47 #include <sys/cdefs.h>
48 __KERNEL_RCSID(0, "$NetBSD: coda_vfsops.c,v 1.84 2014/12/13 15:59:30 hannken Exp $");
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/sysctl.h>
53 #include <sys/malloc.h>
54 #include <sys/conf.h>
55 #include <sys/namei.h>
56 #include <sys/dirent.h>
57 #include <sys/mount.h>
58 #include <sys/proc.h>
59 #include <sys/select.h>
60 #include <sys/kauth.h>
61 #include <sys/module.h>
62
63 #include <coda/coda.h>
64 #include <coda/cnode.h>
65 #include <coda/coda_vfsops.h>
66 #include <coda/coda_venus.h>
67 #include <coda/coda_subr.h>
68 #include <coda/coda_opstats.h>
69 /* for VN_RDEV */
70 #include <miscfs/specfs/specdev.h>
71 #include <miscfs/genfs/genfs.h>
72
73 MODULE(MODULE_CLASS_VFS, coda, "vcoda");
74
75 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
76
77 extern struct vnode *coda_ctlvp;
78 extern struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
79
80 /* structure to keep statistics of internally generated/satisfied calls */
81
82 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
83
84 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
85 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
86 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
87 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
88
89 extern const struct cdevsw vcoda_cdevsw;
90 extern const struct vnodeopv_desc coda_vnodeop_opv_desc;
91
92 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = {
93 &coda_vnodeop_opv_desc,
94 NULL,
95 };
96
97 struct vfsops coda_vfsops = {
98 .vfs_name = MOUNT_CODA,
99 .vfs_min_mount_data = 256,
100 /* This is the pathname, unlike every other fs */
101 .vfs_mount = coda_mount,
102 .vfs_start = coda_start,
103 .vfs_unmount = coda_unmount,
104 .vfs_root = coda_root,
105 .vfs_quotactl = (void *)eopnotsupp,
106 .vfs_statvfs = coda_nb_statvfs,
107 .vfs_sync = coda_sync,
108 .vfs_vget = coda_vget,
109 .vfs_loadvnode = coda_loadvnode,
110 .vfs_fhtovp = (void *)eopnotsupp,
111 .vfs_vptofh = (void *)eopnotsupp,
112 .vfs_init = coda_init,
113 .vfs_done = coda_done,
114 .vfs_mountroot = (void *)eopnotsupp,
115 .vfs_snapshot = (void *)eopnotsupp,
116 .vfs_extattrctl = vfs_stdextattrctl,
117 .vfs_suspendctl = (void *)eopnotsupp,
118 .vfs_renamelock_enter = genfs_renamelock_enter,
119 .vfs_renamelock_exit = genfs_renamelock_exit,
120 .vfs_fsync = (void *)eopnotsupp,
121 .vfs_opv_descs = coda_vnodeopv_descs
122 };
123
124 static int
coda_modcmd(modcmd_t cmd,void * arg)125 coda_modcmd(modcmd_t cmd, void *arg)
126 {
127
128 switch (cmd) {
129 case MODULE_CMD_INIT:
130 return vfs_attach(&coda_vfsops);
131 case MODULE_CMD_FINI:
132 return vfs_detach(&coda_vfsops);
133 default:
134 return ENOTTY;
135 }
136 }
137
138 int
coda_vfsopstats_init(void)139 coda_vfsopstats_init(void)
140 {
141 int i;
142
143 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
144 coda_vfsopstats[i].opcode = i;
145 coda_vfsopstats[i].entries = 0;
146 coda_vfsopstats[i].sat_intrn = 0;
147 coda_vfsopstats[i].unsat_intrn = 0;
148 coda_vfsopstats[i].gen_intrn = 0;
149 }
150
151 return 0;
152 }
153
154 /*
155 * cfs mount vfsop
156 * Set up mount info record and attach it to vfs struct.
157 */
158 /*ARGSUSED*/
159 int
coda_mount(struct mount * vfsp,const char * path,void * data,size_t * data_len)160 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */
161 const char *path, /* path covered: ignored by the fs-layer */
162 void *data, /* Need to define a data type for this in netbsd? */
163 size_t *data_len)
164 {
165 struct lwp *l = curlwp;
166 struct vnode *dvp;
167 struct cnode *cp;
168 dev_t dev;
169 struct coda_mntinfo *mi;
170 struct vnode *rtvp;
171 const struct cdevsw *cdev;
172 CodaFid rootfid = INVAL_FID;
173 CodaFid ctlfid = CTL_FID;
174 int error;
175
176 if (data == NULL)
177 return EINVAL;
178 if (vfsp->mnt_flag & MNT_GETARGS)
179 return EINVAL;
180 ENTRY;
181
182 coda_vfsopstats_init();
183 coda_vnodeopstats_init();
184
185 MARK_ENTRY(CODA_MOUNT_STATS);
186 if (CODA_MOUNTED(vfsp)) {
187 MARK_INT_FAIL(CODA_MOUNT_STATS);
188 return(EBUSY);
189 }
190
191 /* Validate mount device. Similar to getmdev(). */
192
193 /*
194 * XXX: coda passes the mount device as the entire mount args,
195 * All other fs pass a structure contining a pointer.
196 * In order to get sys_mount() to do the copyin() we've set a
197 * fixed default size for the filename buffer.
198 */
199 /* Ensure that namei() doesn't run off the filename buffer */
200 ((char *)data)[*data_len - 1] = 0;
201 error = namei_simple_kernel((char *)data, NSM_FOLLOW_NOEMULROOT,
202 &dvp);
203
204 if (error) {
205 MARK_INT_FAIL(CODA_MOUNT_STATS);
206 return (error);
207 }
208 if (dvp->v_type != VCHR) {
209 MARK_INT_FAIL(CODA_MOUNT_STATS);
210 vrele(dvp);
211 return(ENXIO);
212 }
213 dev = dvp->v_rdev;
214 vrele(dvp);
215 cdev = cdevsw_lookup(dev);
216 if (cdev == NULL) {
217 MARK_INT_FAIL(CODA_MOUNT_STATS);
218 return(ENXIO);
219 }
220
221 /*
222 * See if the device table matches our expectations.
223 */
224 if (cdev != &vcoda_cdevsw)
225 {
226 MARK_INT_FAIL(CODA_MOUNT_STATS);
227 return(ENXIO);
228 }
229
230 if (minor(dev) >= NVCODA) {
231 MARK_INT_FAIL(CODA_MOUNT_STATS);
232 return(ENXIO);
233 }
234
235 /*
236 * Initialize the mount record and link it to the vfs struct
237 */
238 mi = &coda_mnttbl[minor(dev)];
239
240 if (!VC_OPEN(&mi->mi_vcomm)) {
241 MARK_INT_FAIL(CODA_MOUNT_STATS);
242 return(ENODEV);
243 }
244
245 /* No initialization (here) of mi_vcomm! */
246 vfsp->mnt_data = mi;
247 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0;
248 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA);
249 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0];
250 vfsp->mnt_stat.f_namemax = CODA_MAXNAMLEN;
251 mi->mi_vfsp = vfsp;
252
253 /*
254 * Make a root vnode to placate the Vnode interface, but don't
255 * actually make the CODA_ROOT call to venus until the first call
256 * to coda_root in case a server is down while venus is starting.
257 */
258 cp = make_coda_node(&rootfid, vfsp, VDIR);
259 rtvp = CTOV(cp);
260 rtvp->v_vflag |= VV_ROOT;
261
262 cp = make_coda_node(&ctlfid, vfsp, VCHR);
263
264 coda_ctlvp = CTOV(cp);
265
266 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
267 mi->mi_vfsp = vfsp;
268 mi->mi_rootvp = rtvp;
269
270 /* set filesystem block size */
271 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
272 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */
273
274 /* error is currently guaranteed to be zero, but in case some
275 code changes... */
276 CODADEBUG(1,
277 myprintf(("coda_mount returned %d\n",error)););
278 if (error)
279 MARK_INT_FAIL(CODA_MOUNT_STATS);
280 else
281 MARK_INT_SAT(CODA_MOUNT_STATS);
282
283 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE,
284 vfsp->mnt_op->vfs_name, vfsp, l);
285 }
286
287 int
coda_start(struct mount * vfsp,int flags)288 coda_start(struct mount *vfsp, int flags)
289 {
290 ENTRY;
291 vftomi(vfsp)->mi_started = 1;
292 return (0);
293 }
294
295 int
coda_unmount(struct mount * vfsp,int mntflags)296 coda_unmount(struct mount *vfsp, int mntflags)
297 {
298 struct coda_mntinfo *mi = vftomi(vfsp);
299 int active, error = 0;
300
301 ENTRY;
302 MARK_ENTRY(CODA_UMOUNT_STATS);
303 if (!CODA_MOUNTED(vfsp)) {
304 MARK_INT_FAIL(CODA_UMOUNT_STATS);
305 return(EINVAL);
306 }
307
308 if (mi->mi_vfsp == vfsp) { /* We found the victim */
309 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
310 return (EBUSY); /* Venus is still running */
311
312 #ifdef DEBUG
313 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
314 #endif
315 mi->mi_started = 0;
316
317 vrele(mi->mi_rootvp);
318 vrele(coda_ctlvp);
319
320 active = coda_kill(vfsp, NOT_DOWNCALL);
321 mi->mi_rootvp->v_vflag &= ~VV_ROOT;
322 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
323 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
324 error = 0;
325
326 /* I'm going to take this out to allow lookups to go through. I'm
327 * not sure it's important anyway. -- DCS 2/2/94
328 */
329 /* vfsp->VFS_DATA = NULL; */
330
331 /* No more vfsp's to hold onto */
332 mi->mi_vfsp = NULL;
333 mi->mi_rootvp = NULL;
334
335 if (error)
336 MARK_INT_FAIL(CODA_UMOUNT_STATS);
337 else
338 MARK_INT_SAT(CODA_UMOUNT_STATS);
339
340 return(error);
341 }
342 return (EINVAL);
343 }
344
345 /*
346 * find root of cfs
347 */
348 int
coda_root(struct mount * vfsp,struct vnode ** vpp)349 coda_root(struct mount *vfsp, struct vnode **vpp)
350 {
351 struct coda_mntinfo *mi = vftomi(vfsp);
352 int error;
353 struct lwp *l = curlwp; /* XXX - bnoble */
354 CodaFid VFid;
355 static const CodaFid invalfid = INVAL_FID;
356
357 ENTRY;
358 MARK_ENTRY(CODA_ROOT_STATS);
359
360 if (vfsp == mi->mi_vfsp) {
361 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid)))
362 { /* Found valid root. */
363 *vpp = mi->mi_rootvp;
364 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
365 vref(*vpp);
366 vn_lock(*vpp, LK_EXCLUSIVE);
367 MARK_INT_SAT(CODA_ROOT_STATS);
368 return(0);
369 }
370 }
371
372 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid);
373
374 if (!error) {
375 struct cnode *cp = VTOC(mi->mi_rootvp);
376
377 /*
378 * Save the new rootfid in the cnode, and rekey the cnode
379 * with the new fid key.
380 */
381 error = vcache_rekey_enter(vfsp, mi->mi_rootvp,
382 &invalfid, sizeof(CodaFid), &VFid, sizeof(CodaFid));
383 if (error)
384 goto exit;
385 cp->c_fid = VFid;
386 vcache_rekey_exit(vfsp, mi->mi_rootvp,
387 &invalfid, sizeof(CodaFid), &cp->c_fid, sizeof(CodaFid));
388
389 *vpp = mi->mi_rootvp;
390 vref(*vpp);
391 vn_lock(*vpp, LK_EXCLUSIVE);
392 MARK_INT_SAT(CODA_ROOT_STATS);
393 goto exit;
394 } else if (error == ENODEV || error == EINTR) {
395 /* Gross hack here! */
396 /*
397 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
398 * ENODEV. Return the uninitialized root vnode to allow vfs
399 * operations such as unmount to continue. Without this hack,
400 * there is no way to do an unmount if Venus dies before a
401 * successful CODA_ROOT call is done. All vnode operations
402 * will fail.
403 */
404 *vpp = mi->mi_rootvp;
405 vref(*vpp);
406 vn_lock(*vpp, LK_EXCLUSIVE);
407 MARK_INT_FAIL(CODA_ROOT_STATS);
408 error = 0;
409 goto exit;
410 } else {
411 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
412 MARK_INT_FAIL(CODA_ROOT_STATS);
413
414 goto exit;
415 }
416 exit:
417 return(error);
418 }
419
420 /*
421 * Get file system statistics.
422 */
423 int
coda_nb_statvfs(struct mount * vfsp,struct statvfs * sbp)424 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp)
425 {
426 struct lwp *l = curlwp;
427 struct coda_statfs fsstat;
428 int error;
429
430 ENTRY;
431 MARK_ENTRY(CODA_STATFS_STATS);
432 if (!CODA_MOUNTED(vfsp)) {
433 /* MARK_INT_FAIL(CODA_STATFS_STATS); */
434 return(EINVAL);
435 }
436
437 /* XXX - what to do about f_flags, others? --bnoble */
438 /* Below This is what AFS does
439 #define NB_SFS_SIZ 0x895440
440 */
441 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
442
443 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat);
444
445 if (!error) {
446 sbp->f_bsize = 8192; /* XXX */
447 sbp->f_frsize = 8192; /* XXX */
448 sbp->f_iosize = 8192; /* XXX */
449 sbp->f_blocks = fsstat.f_blocks;
450 sbp->f_bfree = fsstat.f_bfree;
451 sbp->f_bavail = fsstat.f_bavail;
452 sbp->f_bresvd = 0;
453 sbp->f_files = fsstat.f_files;
454 sbp->f_ffree = fsstat.f_ffree;
455 sbp->f_favail = fsstat.f_ffree;
456 sbp->f_fresvd = 0;
457 copy_statvfs_info(sbp, vfsp);
458 }
459
460 MARK_INT_SAT(CODA_STATFS_STATS);
461 return(error);
462 }
463
464 /*
465 * Flush any pending I/O.
466 */
467 int
coda_sync(struct mount * vfsp,int waitfor,kauth_cred_t cred)468 coda_sync(struct mount *vfsp, int waitfor,
469 kauth_cred_t cred)
470 {
471 ENTRY;
472 MARK_ENTRY(CODA_SYNC_STATS);
473 MARK_INT_SAT(CODA_SYNC_STATS);
474 return(0);
475 }
476
477 int
coda_vget(struct mount * vfsp,ino_t ino,struct vnode ** vpp)478 coda_vget(struct mount *vfsp, ino_t ino,
479 struct vnode **vpp)
480 {
481 ENTRY;
482 return (EOPNOTSUPP);
483 }
484
485 int
coda_loadvnode(struct mount * mp,struct vnode * vp,const void * key,size_t key_len,const void ** new_key)486 coda_loadvnode(struct mount *mp, struct vnode *vp,
487 const void *key, size_t key_len, const void **new_key)
488 {
489 CodaFid fid;
490 struct cnode *cp;
491 extern int (**coda_vnodeop_p)(void *);
492
493 KASSERT(key_len == sizeof(CodaFid));
494 memcpy(&fid, key, key_len);
495
496 cp = kmem_zalloc(sizeof(*cp), KM_SLEEP);
497 mutex_init(&cp->c_lock, MUTEX_DEFAULT, IPL_NONE);
498 cp->c_fid = fid;
499 cp->c_vnode = vp;
500 vp->v_op = coda_vnodeop_p;
501 vp->v_tag = VT_CODA;
502 vp->v_type = VNON;
503 vp->v_data = cp;
504
505 *new_key = &cp->c_fid;
506
507 return 0;
508 }
509
510 /*
511 * fhtovp is now what vget used to be in 4.3-derived systems. For
512 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
513 * a type-specific fid.
514 */
515 int
coda_fhtovp(struct mount * vfsp,struct fid * fhp,struct mbuf * nam,struct vnode ** vpp,int * exflagsp,kauth_cred_t * creadanonp)516 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam,
517 struct vnode **vpp, int *exflagsp,
518 kauth_cred_t *creadanonp)
519 {
520 struct cfid *cfid = (struct cfid *)fhp;
521 struct cnode *cp = 0;
522 int error;
523 struct lwp *l = curlwp; /* XXX -mach */
524 CodaFid VFid;
525 int vtype;
526
527 ENTRY;
528
529 MARK_ENTRY(CODA_VGET_STATS);
530 /* Check for vget of control object. */
531 if (IS_CTL_FID(&cfid->cfid_fid)) {
532 *vpp = coda_ctlvp;
533 vref(coda_ctlvp);
534 MARK_INT_SAT(CODA_VGET_STATS);
535 return(0);
536 }
537
538 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype);
539
540 if (error) {
541 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
542 *vpp = (struct vnode *)0;
543 } else {
544 CODADEBUG(CODA_VGET,
545 myprintf(("vget: %s type %d result %d\n",
546 coda_f2s(&VFid), vtype, error)); )
547
548 cp = make_coda_node(&VFid, vfsp, vtype);
549 *vpp = CTOV(cp);
550 }
551 return(error);
552 }
553
554 int
coda_vptofh(struct vnode * vnp,struct fid * fidp)555 coda_vptofh(struct vnode *vnp, struct fid *fidp)
556 {
557 ENTRY;
558 return (EOPNOTSUPP);
559 }
560
561 void
coda_init(void)562 coda_init(void)
563 {
564 ENTRY;
565 }
566
567 void
coda_done(void)568 coda_done(void)
569 {
570 ENTRY;
571 }
572
573 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup")
574 {
575
576 sysctl_createv(clog, 0, NULL, NULL,
577 CTLFLAG_PERMANENT,
578 CTLTYPE_NODE, "coda",
579 SYSCTL_DESCR("code vfs options"),
580 NULL, 0, NULL, 0,
581 CTL_VFS, 18, CTL_EOL);
582 /*
583 * XXX the "18" above could be dynamic, thereby eliminating
584 * one more instance of the "number to vfs" mapping problem,
585 * but "18" is the order as taken from sys/mount.h
586 */
587
588 /*
589 sysctl_createv(clog, 0, NULL, NULL,
590 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
591 CTLTYPE_INT, "clusterread",
592 SYSCTL_DESCR( anyone? ),
593 NULL, 0, &doclusterread, 0,
594 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL);
595 */
596 }
597
598 /*
599 * To allow for greater ease of use, some vnodes may be orphaned when
600 * Venus dies. Certain operations should still be allowed to go
601 * through, but without propagating orphan-ness. So this function will
602 * get a new vnode for the file from the current run of Venus.
603 */
604
605 int
getNewVnode(struct vnode ** vpp)606 getNewVnode(struct vnode **vpp)
607 {
608 struct cfid cfid;
609 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
610
611 ENTRY;
612
613 cfid.cfid_len = (short)sizeof(CodaFid);
614 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
615 /* XXX ? */
616
617 /* We're guessing that if set, the 1st element on the list is a
618 * valid vnode to use. If not, return ENODEV as venus is dead.
619 */
620 if (mi->mi_vfsp == NULL)
621 return ENODEV;
622
623 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
624 NULL, NULL);
625 }
626
627 #include <ufs/ufs/quota.h>
628 #include <ufs/ufs/ufsmount.h>
629 /* get the mount structure corresponding to a given device. Assume
630 * device corresponds to a UFS. Return NULL if no device is found.
631 */
devtomp(dev_t dev)632 struct mount *devtomp(dev_t dev)
633 {
634 struct mount *mp;
635
636 mutex_enter(&mountlist_lock);
637 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
638 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) &&
639 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) {
640 /* mount corresponds to UFS and the device matches one we want */
641 break;
642 }
643 }
644 mutex_exit(&mountlist_lock);
645 return mp;
646 }
647