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NetBSD/sys/coda/coda_vfsops.c
wrstuden 862a56e88b Modify vfsops to seperate vfs_fhtovp() into two routines. vfs_fhtovp() now 
only handles the file handle to vnode conversion, and a new call,
vfs_checkexp(), performs the export verification.
1999-02-26 23:44:43 +00:00

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/* $NetBSD: coda_vfsops.c,v 1.7 1999/02/26 23:44:44 wrstuden Exp $ */
/*
*
* Coda: an Experimental Distributed File System
* Release 3.1
*
* Copyright (c) 1987-1998 Carnegie Mellon University
* All Rights Reserved
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation, and
* that credit is given to Carnegie Mellon University in all documents
* and publicity pertaining to direct or indirect use of this code or its
* derivatives.
*
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
* ANY DERIVATIVE WORK.
*
* Carnegie Mellon encourages users of this software to return any
* improvements or extensions that they make, and to grant Carnegie
* Mellon the rights to redistribute these changes without encumbrance.
*
* @(#) cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:26:45 rvb Exp $
*/
/*
* Mach Operating System
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* This code was written for the Coda file system at Carnegie Mellon
* University. Contributers include David Steere, James Kistler, and
* M. Satyanarayanan.
*/
/*
* HISTORY
* $Log: coda_vfsops.c,v $
* Revision 1.7 1999/02/26 23:44:44 wrstuden
* Modify vfsops to seperate vfs_fhtovp() into two routines. vfs_fhtovp() now
* only handles the file handle to vnode conversion, and a new call,
* vfs_checkexp(), performs the export verification.
*
* Revision 1.6 1998/12/10 02:22:52 rvb
* Commit a couple of old fixes
*
* Revision 1.5 1998/09/25 15:01:13 rvb
* Conditionalize "stray" printouts under DIAGNOSTIC and DEBUG.
* Make files compile if DEBUG is on (from Alan Barrett). Finally,
* make coda an lkm.
*
* Revision 1.4 1998/09/15 02:03:00 rvb
* Final piece of rename cfs->coda
*
* Revision 1.3 1998/09/12 15:05:49 rvb
* Change cfs/CFS in symbols, strings and constants to coda/CODA
* to avoid fs conflicts.
*
* Revision 1.2 1998/09/08 17:12:47 rvb
* Pass2 complete
*
* Revision 1.1.1.1 1998/08/29 21:26:45 rvb
* Very Preliminary Coda
*
* Revision 1.11 1998/08/28 18:12:22 rvb
* Now it also works on FreeBSD -current. This code will be
* committed to the FreeBSD -current and NetBSD -current
* trees. It will then be tailored to the particular platform
* by flushing conditional code.
*
* Revision 1.10 1998/08/18 17:05:19 rvb
* Don't use __RCSID now
*
* Revision 1.9 1998/08/18 16:31:44 rvb
* Sync the code for NetBSD -current; test on 1.3 later
*
* Revision 1.8 98/02/24 22:22:48 rvb
* Fixes up mainly to flush iopen and friends
*
* Revision 1.7 98/01/23 11:53:45 rvb
* Bring RVB_CODA1_1 to HEAD
*
* Revision 1.6.2.6 98/01/23 11:21:07 rvb
* Sync with 2.2.5
*
* Revision 1.6.2.5 98/01/22 13:05:33 rvb
* Move make_coda_node ctlfid later so vfsp is known
*
* Revision 1.6.2.4 97/12/19 14:26:05 rvb
* session id
*
* Revision 1.6.2.3 97/12/16 12:40:11 rvb
* Sync with 1.3
*
* Revision 1.6.2.2 97/12/10 11:40:25 rvb
* No more ody
*
* Revision 1.6.2.1 97/12/06 17:41:24 rvb
* Sync with peters coda.h
*
* Revision 1.6 97/12/05 10:39:21 rvb
* Read CHANGES
*
* Revision 1.5.14.8 97/11/24 15:44:46 rvb
* Final cfs_venus.c w/o macros, but one locking bug
*
* Revision 1.5.14.7 97/11/21 13:22:03 rvb
* Catch a few coda_calls in coda_vfsops.c
*
* Revision 1.5.14.6 97/11/20 11:46:48 rvb
* Capture current cfs_venus
*
* Revision 1.5.14.5 97/11/18 10:27:17 rvb
* cfs_nbsd.c is DEAD!!!; integrated into cfs_vf/vnops.c
* cfs_nb_foo and cfs_foo are joined
*
* Revision 1.5.14.4 97/11/13 22:03:01 rvb
* pass2 cfs_NetBSD.h mt
*
* Revision 1.5.14.3 97/11/12 12:09:40 rvb
* reorg pass1
*
* Revision 1.5.14.2 97/10/29 16:06:28 rvb
* Kill DYING
*
* Revision 1.5.14.1 1997/10/28 23:10:17 rvb
* >64Meg; venus can be killed!
*
* Revision 1.5 1997/01/13 17:11:07 bnoble
* Coda statfs needs to return something other than -1 for blocks avail. and
* files available for wabi (and other windowsish) programs to install
* there correctly.
*
* Revision 1.4 1996/12/12 22:11:00 bnoble
* Fixed the "downcall invokes venus operation" deadlock in all known cases.
* There may be more
*
* Revision 1.3 1996/11/08 18:06:12 bnoble
* Minor changes in vnode operation signature, VOP_UPDATE signature, and
* some newly defined bits in the include files.
*
* Revision 1.2 1996/01/02 16:57:04 bnoble
* Added support for Coda MiniCache and raw inode calls (final commit)
*
* Revision 1.1.2.1 1995/12/20 01:57:32 bnoble
* Added CODA-specific files
*
* Revision 3.1.1.1 1995/03/04 19:08:02 bnoble
* Branch for NetBSD port revisions
*
* Revision 3.1 1995/03/04 19:08:01 bnoble
* Bump to major revision 3 to prepare for NetBSD port
*
* Revision 2.4 1995/02/17 16:25:22 dcs
* These versions represent several changes:
* 1. Allow venus to restart even if outstanding references exist.
* 2. Have only one ctlvp per client, as opposed to one per mounted cfs device.d
* 3. Allow ody_expand to return many members, not just one.
*
* Revision 2.3 94/10/14 09:58:21 dcs
* Made changes 'cause sun4s have braindead compilers
*
* Revision 2.2 94/10/12 16:46:33 dcs
* Cleaned kernel/venus interface by removing XDR junk, plus
* so cleanup to allow this code to be more easily ported.
*
* Revision 1.3 93/05/28 16:24:29 bnoble
* *** empty log message ***
*
* Revision 1.2 92/10/27 17:58:24 lily
* merge kernel/latest and alpha/src/cfs
*
* Revision 2.3 92/09/30 14:16:32 mja
* Added call to coda_flush to coda_unmount.
* [90/12/15 dcs]
*
* Added contributors blurb.
* [90/12/13 jjk]
*
* Revision 2.2 90/07/05 11:26:40 mrt
* Created for the Coda File System.
* [90/05/23 dcs]
*
* Revision 1.3 90/05/31 17:01:42 dcs
* Prepare for merge with facilities kernel.
*
*
*/
#ifdef _LKM
#define NVCODA 4
#else
#include <vcoda.h>
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/select.h>
#include <coda/coda.h>
#include <coda/cnode.h>
#include <coda/coda_vfsops.h>
#include <coda/coda_venus.h>
#include <coda/coda_subr.h>
#include <coda/coda_opstats.h>
/* for VN_RDEV */
#include <miscfs/specfs/specdev.h>
int codadebug = 0;
int coda_vfsop_print_entry = 0;
#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
struct vnode *coda_ctlvp;
struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
/* structure to keep statistics of internally generated/satisfied calls */
struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
#define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
#define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
#define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
#define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
extern int coda_nc_initialized; /* Set if cache has been initialized */
extern int vc_nb_open __P((dev_t, int, int, struct proc *));
extern struct cdevsw cdevsw[]; /* For sanity check in coda_mount */
extern struct vnodeopv_desc coda_vnodeop_opv_desc;
struct vnodeopv_desc *coda_vnodeopv_descs[] = {
&coda_vnodeop_opv_desc,
NULL,
};
struct vfsops coda_vfsops = {
MOUNT_CODA,
coda_mount,
coda_start,
coda_unmount,
coda_root,
coda_quotactl,
coda_nb_statfs,
coda_sync,
coda_vget,
(int (*) (struct mount *, struct fid *, struct vnode ** ))
eopnotsupp,
(int (*) (struct vnode *, struct fid *)) eopnotsupp,
coda_init,
coda_sysctl,
(int (*)(void)) eopnotsupp,
(int (*)(struct mount *, struct mbuf *, int *, struct ucred **))
eopnotsupp,
coda_vnodeopv_descs,
0
};
int
coda_vfsopstats_init(void)
{
register int i;
for (i=0;i<CODA_VFSOPS_SIZE;i++) {
coda_vfsopstats[i].opcode = i;
coda_vfsopstats[i].entries = 0;
coda_vfsopstats[i].sat_intrn = 0;
coda_vfsopstats[i].unsat_intrn = 0;
coda_vfsopstats[i].gen_intrn = 0;
}
return 0;
}
/*
* cfs mount vfsop
* Set up mount info record and attach it to vfs struct.
*/
/*ARGSUSED*/
int
coda_mount(vfsp, path, data, ndp, p)
struct mount *vfsp; /* Allocated and initialized by mount(2) */
const char *path; /* path covered: ignored by the fs-layer */
void *data; /* Need to define a data type for this in netbsd? */
struct nameidata *ndp; /* Clobber this to lookup the device name */
struct proc *p; /* The ever-famous proc pointer */
{
struct vnode *dvp;
struct cnode *cp;
dev_t dev;
struct coda_mntinfo *mi;
struct vnode *rootvp;
ViceFid rootfid;
ViceFid ctlfid;
int error;
ENTRY;
coda_vfsopstats_init();
coda_vnodeopstats_init();
MARK_ENTRY(CODA_MOUNT_STATS);
if (CODA_MOUNTED(vfsp)) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
return(EBUSY);
}
/* Validate mount device. Similar to getmdev(). */
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p);
error = namei(ndp);
dvp = ndp->ni_vp;
if (error) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
return (error);
}
if (dvp->v_type != VCHR) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
vrele(dvp);
return(ENXIO);
}
dev = dvp->v_specinfo->si_rdev;
vrele(dvp);
if (major(dev) >= nchrdev || major(dev) < 0) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
return(ENXIO);
}
/*
* See if the device table matches our expectations.
*/
if (cdevsw[major(dev)].d_open != vc_nb_open)
{
MARK_INT_FAIL(CODA_MOUNT_STATS);
return(ENXIO);
}
if (minor(dev) >= NVCODA || minor(dev) < 0) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
return(ENXIO);
}
/*
* Initialize the mount record and link it to the vfs struct
*/
mi = &coda_mnttbl[minor(dev)];
if (!VC_OPEN(&mi->mi_vcomm)) {
MARK_INT_FAIL(CODA_MOUNT_STATS);
return(ENODEV);
}
/* No initialization (here) of mi_vcomm! */
vfsp->mnt_data = (qaddr_t)mi;
vfsp->mnt_stat.f_fsid.val[0] = 0;
vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA);
mi->mi_vfsp = vfsp;
/*
* Make a root vnode to placate the Vnode interface, but don't
* actually make the CODA_ROOT call to venus until the first call
* to coda_root in case a server is down while venus is starting.
*/
rootfid.Volume = 0;
rootfid.Vnode = 0;
rootfid.Unique = 0;
cp = make_coda_node(&rootfid, vfsp, VDIR);
rootvp = CTOV(cp);
rootvp->v_flag |= VROOT;
ctlfid.Volume = CTL_VOL;
ctlfid.Vnode = CTL_VNO;
ctlfid.Unique = CTL_UNI;
/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
The above code seems to cause a loop in the cnode links.
I don't totally understand when it happens, it is caught
when closing down the system.
*/
cp = make_coda_node(&ctlfid, 0, VCHR);
coda_ctlvp = CTOV(cp);
/* Add vfs and rootvp to chain of vfs hanging off mntinfo */
mi->mi_vfsp = vfsp;
mi->mi_rootvp = rootvp;
/* set filesystem block size */
vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
/* error is currently guaranteed to be zero, but in case some
code changes... */
CODADEBUG(1,
myprintf(("coda_mount returned %d\n",error)););
if (error)
MARK_INT_FAIL(CODA_MOUNT_STATS);
else
MARK_INT_SAT(CODA_MOUNT_STATS);
return(error);
}
int
coda_start(vfsp, flags, p)
struct mount *vfsp;
int flags;
struct proc *p;
{
ENTRY;
return (0);
}
int
coda_unmount(vfsp, mntflags, p)
struct mount *vfsp;
int mntflags;
struct proc *p;
{
struct coda_mntinfo *mi = vftomi(vfsp);
int active, error = 0;
ENTRY;
MARK_ENTRY(CODA_UMOUNT_STATS);
if (!CODA_MOUNTED(vfsp)) {
MARK_INT_FAIL(CODA_UMOUNT_STATS);
return(EINVAL);
}
if (mi->mi_vfsp == vfsp) { /* We found the victim */
if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
return (EBUSY); /* Venus is still running */
#ifdef DEBUG
printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
#endif
vrele(mi->mi_rootvp);
active = coda_kill(vfsp, NOT_DOWNCALL);
mi->mi_rootvp->v_flag &= ~VROOT;
error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
printf("coda_unmount: active = %d, vflush active %d\n", active, error);
error = 0;
/* I'm going to take this out to allow lookups to go through. I'm
* not sure it's important anyway. -- DCS 2/2/94
*/
/* vfsp->VFS_DATA = NULL; */
/* No more vfsp's to hold onto */
mi->mi_vfsp = NULL;
mi->mi_rootvp = NULL;
if (error)
MARK_INT_FAIL(CODA_UMOUNT_STATS);
else
MARK_INT_SAT(CODA_UMOUNT_STATS);
return(error);
}
return (EINVAL);
}
/*
* find root of cfs
*/
int
coda_root(vfsp, vpp)
struct mount *vfsp;
struct vnode **vpp;
{
struct coda_mntinfo *mi = vftomi(vfsp);
struct vnode **result;
int error;
struct proc *p = curproc; /* XXX - bnoble */
ViceFid VFid;
ENTRY;
MARK_ENTRY(CODA_ROOT_STATS);
result = NULL;
if (vfsp == mi->mi_vfsp) {
if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
(VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
(VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
{ /* Found valid root. */
*vpp = mi->mi_rootvp;
/* On Mach, this is vref. On NetBSD, VOP_LOCK */
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE);
MARK_INT_SAT(CODA_ROOT_STATS);
return(0);
}
}
error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid);
if (!error) {
/*
* Save the new rootfid in the cnode, and rehash the cnode into the
* cnode hash with the new fid key.
*/
coda_unsave(VTOC(mi->mi_rootvp));
VTOC(mi->mi_rootvp)->c_fid = VFid;
coda_save(VTOC(mi->mi_rootvp));
*vpp = mi->mi_rootvp;
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE);
MARK_INT_SAT(CODA_ROOT_STATS);
goto exit;
} else if (error == ENODEV || error == EINTR) {
/* Gross hack here! */
/*
* If Venus fails to respond to the CODA_ROOT call, coda_call returns
* ENODEV. Return the uninitialized root vnode to allow vfs
* operations such as unmount to continue. Without this hack,
* there is no way to do an unmount if Venus dies before a
* successful CODA_ROOT call is done. All vnode operations
* will fail.
*/
*vpp = mi->mi_rootvp;
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE);
MARK_INT_FAIL(CODA_ROOT_STATS);
error = 0;
goto exit;
} else {
CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
MARK_INT_FAIL(CODA_ROOT_STATS);
goto exit;
}
exit:
return(error);
}
int
coda_quotactl(vfsp, cmd, uid, arg, p)
struct mount *vfsp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
ENTRY;
return (EOPNOTSUPP);
}
/*
* Get file system statistics.
*/
int
coda_nb_statfs(vfsp, sbp, p)
register struct mount *vfsp;
struct statfs *sbp;
struct proc *p;
{
ENTRY;
/* MARK_ENTRY(CODA_STATFS_STATS); */
if (!CODA_MOUNTED(vfsp)) {
/* MARK_INT_FAIL(CODA_STATFS_STATS);*/
return(EINVAL);
}
bzero(sbp, sizeof(struct statfs));
/* XXX - what to do about f_flags, others? --bnoble */
/* Below This is what AFS does
#define NB_SFS_SIZ 0x895440
*/
/* Note: Normal fs's have a bsize of 0x400 == 1024 */
sbp->f_type = 0;
sbp->f_bsize = 8192; /* XXX */
sbp->f_iosize = 8192; /* XXX */
#define NB_SFS_SIZ 0x8AB75D
sbp->f_blocks = NB_SFS_SIZ;
sbp->f_bfree = NB_SFS_SIZ;
sbp->f_bavail = NB_SFS_SIZ;
sbp->f_files = NB_SFS_SIZ;
sbp->f_ffree = NB_SFS_SIZ;
bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1);
strcpy(sbp->f_mntonname, "/coda");
strcpy(sbp->f_mntfromname, "CODA");
/* MARK_INT_SAT(CODA_STATFS_STATS); */
return(0);
}
/*
* Flush any pending I/O.
*/
int
coda_sync(vfsp, waitfor, cred, p)
struct mount *vfsp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
ENTRY;
MARK_ENTRY(CODA_SYNC_STATS);
MARK_INT_SAT(CODA_SYNC_STATS);
return(0);
}
int
coda_vget(vfsp, ino, vpp)
struct mount *vfsp;
ino_t ino;
struct vnode **vpp;
{
ENTRY;
return (EOPNOTSUPP);
}
/*
* fhtovp is now what vget used to be in 4.3-derived systems. For
* some silly reason, vget is now keyed by a 32 bit ino_t, rather than
* a type-specific fid.
*/
int
coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
register struct mount *vfsp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **creadanonp;
{
struct cfid *cfid = (struct cfid *)fhp;
struct cnode *cp = 0;
int error;
struct proc *p = curproc; /* XXX -mach */
ViceFid VFid;
int vtype;
ENTRY;
MARK_ENTRY(CODA_VGET_STATS);
/* Check for vget of control object. */
if (IS_CTL_FID(&cfid->cfid_fid)) {
*vpp = coda_ctlvp;
vref(coda_ctlvp);
MARK_INT_SAT(CODA_VGET_STATS);
return(0);
}
error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype);
if (error) {
CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
*vpp = (struct vnode *)0;
} else {
CODADEBUG(CODA_VGET,
myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
cp = make_coda_node(&VFid, vfsp, vtype);
*vpp = CTOV(cp);
}
return(error);
}
int
coda_vptofh(vnp, fidp)
struct vnode *vnp;
struct fid *fidp;
{
ENTRY;
return (EOPNOTSUPP);
}
void
coda_init(void)
{
ENTRY;
}
int
coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlp;
void *newp;
size_t newl;
struct proc *p;
{
/* all sysctl names at this level are terminal */
if (namelen != 1)
return (ENOTDIR); /* overloaded */
switch (name[0]) {
/*
case FFS_CLUSTERREAD:
return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread));
*/
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
/*
* To allow for greater ease of use, some vnodes may be orphaned when
* Venus dies. Certain operations should still be allowed to go
* through, but without propagating ophan-ness. So this function will
* get a new vnode for the file from the current run of Venus. */
int
getNewVnode(vpp)
struct vnode **vpp;
{
struct cfid cfid;
struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
ENTRY;
cfid.cfid_len = (short)sizeof(ViceFid);
cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
/* XXX ? */
/* We're guessing that if set, the 1st element on the list is a
* valid vnode to use. If not, return ENODEV as venus is dead.
*/
if (mi->mi_vfsp == NULL)
return ENODEV;
return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
NULL, NULL);
}
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
/* get the mount structure corresponding to a given device. Assume
* device corresponds to a UFS. Return NULL if no device is found.
*/
struct mount *devtomp(dev)
dev_t dev;
{
struct mount *mp, *nmp;
for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) {
nmp = mp->mnt_list.cqe_next;
if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) &&
((VFSTOUFS(mp))->um_dev == (dev_t) dev)) {
/* mount corresponds to UFS and the device matches one we want */
return(mp);
}
}
/* mount structure wasn't found */
return(NULL);
}
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