/* $NetBSD: msdosfs_denode.c,v 1.60 2021/10/23 16:58:17 thorpej Exp $ */
/*-
* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
* Copyright (C) 1994, 1995, 1997 TooLs GmbH.
* All rights reserved.
* Original code by Paul Popelka (
[email protected]) (see below).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Written by Paul Popelka (
[email protected])
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.60 2021/10/23 16:58:17 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/kernel.h> /* defines "time" */
#include <sys/dirent.h>
#include <sys/namei.h>
#include <sys/kauth.h>
#include <uvm/uvm_extern.h>
#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/msdosfsmount.h>
#include <fs/msdosfs/direntry.h>
#include <fs/msdosfs/denode.h>
#include <fs/msdosfs/fat.h>
struct pool msdosfs_denode_pool;
struct fh_key {
struct msdosfsmount *fhk_mount;
uint32_t fhk_dircluster;
uint32_t fhk_diroffset;
};
struct fh_node {
struct rb_node fh_rbnode;
struct fh_key fh_key;
#define fh_mount fh_key.fhk_mount
#define fh_dircluster fh_key.fhk_dircluster
#define fh_diroffset fh_key.fhk_diroffset
uint32_t fh_gen;
};
static int
fh_compare_node_fh(void *ctx, const void *b, const void *key)
{
const struct fh_node * const pnp = b;
const struct fh_key * const fhp = key;
/* msdosfs_fh_destroy() below depends on first sorting on fh_mount. */
if (pnp->fh_mount != fhp->fhk_mount)
return (intptr_t)pnp->fh_mount - (intptr_t)fhp->fhk_mount;
if (pnp->fh_dircluster != fhp->fhk_dircluster)
return pnp->fh_dircluster - fhp->fhk_dircluster;
return pnp->fh_diroffset - fhp->fhk_diroffset;
}
static int
fh_compare_nodes(void *ctx, const void *parent, const void *node)
{
const struct fh_node * const np = node;
return fh_compare_node_fh(ctx, parent, &np->fh_key);
}
static uint32_t fh_generation;
static kmutex_t fh_lock;
static struct pool fh_pool;
static rb_tree_t fh_rbtree;
static const rb_tree_ops_t fh_rbtree_ops = {
.rbto_compare_nodes = fh_compare_nodes,
.rbto_compare_key = fh_compare_node_fh,
.rbto_node_offset = offsetof(struct fh_node, fh_rbnode),
.rbto_context = NULL
};
static const struct genfs_ops msdosfs_genfsops = {
.gop_size = genfs_size,
.gop_alloc = msdosfs_gop_alloc,
.gop_write = genfs_gop_write,
.gop_markupdate = msdosfs_gop_markupdate,
.gop_putrange = genfs_gop_putrange,
};
MALLOC_DECLARE(M_MSDOSFSFAT);
void
msdosfs_init(void)
{
malloc_type_attach(M_MSDOSFSMNT);
malloc_type_attach(M_MSDOSFSFAT);
malloc_type_attach(M_MSDOSFSTMP);
pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0,
"msdosnopl", &pool_allocator_nointr, IPL_NONE);
pool_init(&fh_pool, sizeof(struct fh_node), 0, 0, 0,
"msdosfhpl", &pool_allocator_nointr, IPL_NONE);
rb_tree_init(&fh_rbtree, &fh_rbtree_ops);
mutex_init(&fh_lock, MUTEX_DEFAULT, IPL_NONE);
}
/*
* Reinitialize.
*/
void
msdosfs_reinit(void)
{
}
void
msdosfs_done(void)
{
pool_destroy(&msdosfs_denode_pool);
pool_destroy(&fh_pool);
mutex_destroy(&fh_lock);
malloc_type_detach(M_MSDOSFSTMP);
malloc_type_detach(M_MSDOSFSFAT);
malloc_type_detach(M_MSDOSFSMNT);
}
/*
* If deget() succeeds it returns with the gotten denode unlocked.
*
* pmp - address of msdosfsmount structure of the filesystem containing
* the denode of interest. The pm_dev field and the address of
* the msdosfsmount structure are used.
* dirclust - which cluster bp contains, if dirclust is 0 (root directory)
* diroffset is relative to the beginning of the root directory,
* otherwise it is cluster relative.
* diroffset - offset past begin of cluster of denode we want
* vpp - returns the address of the gotten vnode.
*/
int
msdosfs_deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
struct vnode **vpp)
/* pmp: so we know the maj/min number */
/* dirclust: cluster this dir entry came from */
/* diroffset: index of entry within the cluster */
/* vpp: returns the addr of the gotten vnode */
{
int error;
struct denode_key key;
/*
* On FAT32 filesystems, root is a (more or less) normal
* directory
*/
if (FAT32(pmp) && dirclust == MSDOSFSROOT)
dirclust = pmp->pm_rootdirblk;
memset(&key, 0, sizeof(key));
key.dk_dirclust = dirclust;
key.dk_diroffset = diroffset;
/* key.dk_dirgen = NULL; */
error = vcache_get(pmp->pm_mountp, &key, sizeof(key), vpp);
return error;
}
int
msdosfs_loadvnode(struct mount *mp, struct vnode *vp,
const void *key, size_t key_len, const void **new_key)
{
bool is_root;
int error;
extern int (**msdosfs_vnodeop_p)(void *);
struct msdosfsmount *pmp;
struct direntry *direntptr;
struct denode *ldep;
struct buf *bp;
struct denode_key dkey;
KASSERT(key_len == sizeof(dkey));
memcpy(&dkey, key, key_len);
KASSERT(dkey.dk_dirgen == NULL);
pmp = VFSTOMSDOSFS(mp);
is_root = ((dkey.dk_dirclust == MSDOSFSROOT ||
(FAT32(pmp) && dkey.dk_dirclust == pmp->pm_rootdirblk)) &&
dkey.dk_diroffset == MSDOSFSROOT_OFS);
#ifdef MSDOSFS_DEBUG
printf("loadvnode(pmp %p, dirclust %lu, diroffset %lx, vp %p)\n",
pmp, dkey.dk_dirclust, dkey.dk_diroffset, vp);
#endif
ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK);
memset(ldep, 0, sizeof *ldep);
/* ldep->de_flag = 0; */
/* ldep->de_devvp = 0; */
/* ldep->de_lockf = 0; */
ldep->de_dev = pmp->pm_dev;
ldep->de_dirclust = dkey.dk_dirclust;
ldep->de_diroffset = dkey.dk_diroffset;
ldep->de_pmp = pmp;
ldep->de_devvp = pmp->pm_devvp;
ldep->de_refcnt = 1;
msdosfs_fc_purge(ldep, 0); /* init the FAT cache for this denode */
/*
* Copy the directory entry into the denode area of the vnode.
*/
if (is_root) {
/*
* Directory entry for the root directory. There isn't one,
* so we manufacture one. We should probably rummage
* through the root directory and find a label entry (if it
* exists), and then use the time and date from that entry
* as the time and date for the root denode.
*/
ldep->de_Attributes = ATTR_DIRECTORY;
if (FAT32(pmp))
ldep->de_StartCluster = pmp->pm_rootdirblk;
/* de_FileSize will be filled in further down */
else {
ldep->de_StartCluster = MSDOSFSROOT;
ldep->de_FileSize = pmp->pm_rootdirsize *
pmp->pm_BytesPerSec;
}
/*
* fill in time and date so that dos2unixtime() doesn't
* spit up when called from msdosfs_getattr() with root
* denode
*/
ldep->de_CHun = 0;
ldep->de_CTime = 0x0000; /* 00:00:00 */
ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
| (1 << DD_DAY_SHIFT);
/* Jan 1, 1980 */
ldep->de_ADate = ldep->de_CDate;
ldep->de_MTime = ldep->de_CTime;
ldep->de_MDate = ldep->de_CDate;
/* leave the other fields as garbage */
} else {
error = msdosfs_readep(pmp, ldep->de_dirclust,
ldep->de_diroffset, &bp, &direntptr);
if (error) {
pool_put(&msdosfs_denode_pool, ldep);
return error;
}
DE_INTERNALIZE(ldep, direntptr);
brelse(bp, 0);
}
/*
* Fill in a few fields of the vnode and finish filling in the
* denode.
*/
if (ldep->de_Attributes & ATTR_DIRECTORY) {
/*
* Since DOS directory entries that describe directories
* have 0 in the filesize field, we take this opportunity
* to find out the length of the directory and plug it into
* the denode structure.
*/
u_long size;
vp->v_type = VDIR;
if (ldep->de_StartCluster != MSDOSFSROOT) {
error = msdosfs_pcbmap(ldep, CLUST_END, 0, &size, 0);
if (error == E2BIG) {
ldep->de_FileSize = de_cn2off(pmp, size);
error = 0;
} else
printf("loadvnode(): pcbmap returned %d\n",
error);
}
} else
vp->v_type = VREG;
vref(ldep->de_devvp);
if (is_root)
vp->v_vflag |= VV_ROOT;
vp->v_tag = VT_MSDOSFS;
vp->v_op = msdosfs_vnodeop_p;
vp->v_data = ldep;
ldep->de_vnode = vp;
genfs_node_init(vp, &msdosfs_genfsops);
uvm_vnp_setsize(vp, ldep->de_FileSize);
*new_key = &ldep->de_key;
return 0;
}
int
msdosfs_deupdat(struct denode *dep, int waitfor)
{
return (msdosfs_update(DETOV(dep), NULL, NULL,
waitfor ? UPDATE_WAIT : 0));
}
/*
* Truncate the file described by dep to the length specified by length.
*/
int
msdosfs_detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred)
{
int error;
int allerror;
u_long eofentry;
u_long chaintofree = 0;
daddr_t bn, lastblock;
int boff;
int isadir = dep->de_Attributes & ATTR_DIRECTORY;
struct buf *bp;
struct msdosfsmount *pmp = dep->de_pmp;
#ifdef MSDOSFS_DEBUG
printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
#endif
/*
* Disallow attempts to truncate the root directory since it is of
* fixed size. That's just the way dos filesystems are. We use
* the VROOT bit in the vnode because checking for the directory
* bit and a startcluster of 0 in the denode is not adequate to
* recognize the root directory at this point in a file or
* directory's life.
*/
if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
dep->de_dirclust, dep->de_diroffset);
return (EINVAL);
}
uvm_vnp_setsize(DETOV(dep), length);
if (dep->de_FileSize < length)
return (msdosfs_deextend(dep, length, cred));
lastblock = de_clcount(pmp, length) - 1;
/*
* If the desired length is 0 then remember the starting cluster of
* the file and set the StartCluster field in the directory entry
* to 0. If the desired length is not zero, then get the number of
* the last cluster in the shortened file. Then get the number of
* the first cluster in the part of the file that is to be freed.
* Then set the next cluster pointer in the last cluster of the
* file to CLUST_EOFE.
*/
if (length == 0) {
chaintofree = dep->de_StartCluster;
dep->de_StartCluster = 0;
eofentry = ~0;
} else {
error = msdosfs_pcbmap(dep, lastblock, 0, &eofentry, 0);
if (error) {
#ifdef MSDOSFS_DEBUG
printf("detrunc(): pcbmap fails %d\n", error);
#endif
return (error);
}
}
/*
* If the new length is not a multiple of the cluster size then we
* must zero the tail end of the new last cluster in case it
* becomes part of the file again because of a seek.
*/
if ((boff = length & pmp->pm_crbomask) != 0) {
if (isadir) {
bn = cntobn(pmp, eofentry);
error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
pmp->pm_bpcluster, B_MODIFY, &bp);
if (error) {
#ifdef MSDOSFS_DEBUG
printf("detrunc(): bread fails %d\n", error);
#endif
return (error);
}
memset((char *)bp->b_data + boff, 0,
pmp->pm_bpcluster - boff);
if (flags & IO_SYNC)
bwrite(bp);
else
bdwrite(bp);
} else {
ubc_zerorange(&DETOV(dep)->v_uobj, length,
pmp->pm_bpcluster - boff,
UBC_VNODE_FLAGS(DETOV(dep)));
}
}
/*
* Write out the updated directory entry. Even if the update fails
* we free the trailing clusters.
*/
dep->de_FileSize = length;
if (!isadir)
dep->de_flag |= DE_UPDATE|DE_MODIFIED;
vtruncbuf(DETOV(dep), lastblock + 1, 0, 0);
allerror = msdosfs_deupdat(dep, 1);
#ifdef MSDOSFS_DEBUG
printf("detrunc(): allerror %d, eofentry %lu\n",
allerror, eofentry);
#endif
msdosfs_fc_purge(dep, lastblock + 1);
/*
* If we need to break the cluster chain for the file then do it
* now.
*/
if (eofentry != ~0) {
error = msdosfs_fatentry(FAT_GET_AND_SET, pmp, eofentry,
&chaintofree, CLUST_EOFE);
if (error) {
#ifdef MSDOSFS_DEBUG
printf("detrunc(): fatentry errors %d\n", error);
#endif
return (error);
}
fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
eofentry);
}
/*
* Now free the clusters removed from the file because of the
* truncation.
*/
if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask))
msdosfs_freeclusterchain(pmp, chaintofree);
return (allerror);
}
/*
* Extend the file described by dep to length specified by length.
*/
int
msdosfs_deextend(struct denode *dep, u_long length, kauth_cred_t cred)
{
struct msdosfsmount *pmp = dep->de_pmp;
u_long count, osize;
int error;
/*
* The root of a DOS filesystem cannot be extended.
*/
if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
return (EINVAL);
/*
* Directories cannot be extended.
*/
if (dep->de_Attributes & ATTR_DIRECTORY)
return (EISDIR);
if (length <= dep->de_FileSize)
panic("deextend: file too large");
/*
* Compute the number of clusters to allocate.
*/
count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
if (count > 0) {
if (count > pmp->pm_freeclustercount)
return (ENOSPC);
error = msdosfs_extendfile(dep, count, NULL, NULL, DE_CLEAR);
if (error) {
/* truncate the added clusters away again */
(void) msdosfs_detrunc(dep, dep->de_FileSize, 0, cred);
return (error);
}
}
/*
* Zero extend file range; ubc_zerorange() uses ubc_alloc() and a
* memset(); we set the write size so ubc won't read in file data that
* is zero'd later.
*/
osize = dep->de_FileSize;
dep->de_FileSize = length;
uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize);
dep->de_flag |= DE_UPDATE|DE_MODIFIED;
ubc_zerorange(&DETOV(dep)->v_uobj, (off_t)osize,
(size_t)(round_page(dep->de_FileSize) - osize),
UBC_VNODE_FLAGS(DETOV(dep)));
uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize);
return (msdosfs_deupdat(dep, 1));
}
int
msdosfs_reclaim(void *v)
{
struct vop_reclaim_v2_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
VOP_UNLOCK(vp);
#ifdef MSDOSFS_DEBUG
printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
dep, dep->de_Name, dep->de_refcnt);
#endif
/*
* Purge old data structures associated with the denode.
*/
if (dep->de_devvp) {
vrele(dep->de_devvp);
dep->de_devvp = 0;
}
#if 0 /* XXX */
dep->de_flag = 0;
#endif
/*
* To interlock with msdosfs_sync().
*/
genfs_node_destroy(vp);
mutex_enter(vp->v_interlock);
vp->v_data = NULL;
mutex_exit(vp->v_interlock);
pool_put(&msdosfs_denode_pool, dep);
return (0);
}
int
msdosfs_inactive(void *v)
{
struct vop_inactive_v2_args /* {
struct vnode *a_vp;
bool *a_recycle;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct denode *dep = VTODE(vp);
int error = 0;
#ifdef MSDOSFS_DEBUG
printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
#endif
/*
* Get rid of denodes related to stale file handles.
*/
if (dep->de_Name[0] == SLOT_DELETED)
goto out;
/*
* If the file has been deleted and it is on a read/write
* filesystem, then truncate the file, and mark the directory slot
* as empty. (This may not be necessary for the dos filesystem.)
*/
#ifdef MSDOSFS_DEBUG
printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n",
dep, dep->de_refcnt, vp->v_mount->mnt_flag,
(vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : "");
#endif
if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
if (dep->de_FileSize != 0) {
error = msdosfs_detrunc(dep, (u_long)0, 0, NOCRED);
}
dep->de_Name[0] = SLOT_DELETED;
msdosfs_fh_remove(dep->de_pmp,
dep->de_dirclust, dep->de_diroffset);
}
msdosfs_deupdat(dep, 0);
out:
/*
* If we are done with the denode, reclaim it
* so that it can be reused immediately.
*/
#ifdef MSDOSFS_DEBUG
printf("msdosfs_inactive(): usecount %d, de_Name[0] %x\n",
vrefcnt(vp), dep->de_Name[0]);
#endif
*ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED);
return (error);
}
int
msdosfs_gop_alloc(struct vnode *vp, off_t off,
off_t len, int flags, kauth_cred_t cred)
{
return 0;
}
void
msdosfs_gop_markupdate(struct vnode *vp, int flags)
{
u_long mask = 0;
if ((flags & GOP_UPDATE_ACCESSED) != 0) {
mask = DE_ACCESS;
}
if ((flags & GOP_UPDATE_MODIFIED) != 0) {
mask |= DE_UPDATE;
}
if (mask) {
struct denode *dep = VTODE(vp);
dep->de_flag |= mask;
}
}
int
msdosfs_fh_enter(struct msdosfsmount *pmp,
uint32_t dircluster, uint32_t diroffset, uint32_t *genp)
{
struct fh_key fhkey;
struct fh_node *fhp;
fhkey.fhk_mount = pmp;
fhkey.fhk_dircluster = dircluster;
fhkey.fhk_diroffset = diroffset;
mutex_enter(&fh_lock);
fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
if (fhp == NULL) {
mutex_exit(&fh_lock);
fhp = pool_get(&fh_pool, PR_WAITOK);
mutex_enter(&fh_lock);
fhp->fh_key = fhkey;
fhp->fh_gen = fh_generation++;
rb_tree_insert_node(&fh_rbtree, fhp);
}
*genp = fhp->fh_gen;
mutex_exit(&fh_lock);
return 0;
}
int
msdosfs_fh_remove(struct msdosfsmount *pmp,
uint32_t dircluster, uint32_t diroffset)
{
struct fh_key fhkey;
struct fh_node *fhp;
fhkey.fhk_mount = pmp;
fhkey.fhk_dircluster = dircluster;
fhkey.fhk_diroffset = diroffset;
mutex_enter(&fh_lock);
fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
if (fhp == NULL) {
mutex_exit(&fh_lock);
return ENOENT;
}
rb_tree_remove_node(&fh_rbtree, fhp);
mutex_exit(&fh_lock);
pool_put(&fh_pool, fhp);
return 0;
}
int
msdosfs_fh_lookup(struct msdosfsmount *pmp,
uint32_t dircluster, uint32_t diroffset, uint32_t *genp)
{
struct fh_key fhkey;
struct fh_node *fhp;
fhkey.fhk_mount = pmp;
fhkey.fhk_dircluster = dircluster;
fhkey.fhk_diroffset = diroffset;
mutex_enter(&fh_lock);
fhp = rb_tree_find_node(&fh_rbtree, &fhkey);
if (fhp == NULL) {
mutex_exit(&fh_lock);
return ESTALE;
}
*genp = fhp->fh_gen;
mutex_exit(&fh_lock);
return 0;
}
void
msdosfs_fh_destroy(struct msdosfsmount *pmp)
{
struct fh_key fhkey;
struct fh_node *fhp, *nfhp;
fhkey.fhk_mount = pmp;
fhkey.fhk_dircluster = 0;
fhkey.fhk_diroffset = 0;
mutex_enter(&fh_lock);
for (fhp = rb_tree_find_node_geq(&fh_rbtree, &fhkey);
fhp != NULL && fhp->fh_mount == pmp; fhp = nfhp) {
nfhp = rb_tree_iterate(&fh_rbtree, fhp, RB_DIR_RIGHT);
rb_tree_remove_node(&fh_rbtree, fhp);
pool_put(&fh_pool, fhp);
}
#ifdef DIAGNOSTIC
RB_TREE_FOREACH(fhp, &fh_rbtree) {
KASSERT(fhp->fh_mount != pmp);
}
#endif
mutex_exit(&fh_lock);
}
