/* $NetBSD: ntfs_subr.c,v 1.64 2021/05/13 08:57:29 hannken Exp $ */

/* $NetBSD: ntfs_subr.c,v 1.64 2021/05/13 08:57:29 hannken Exp $ */

/*-
* Copyright (c) 1998, 1999 Semen Ustimenko ([email protected])
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
*
* Id: ntfs_subr.c,v 1.4 1999/05/12 09:43:01 semenu Exp
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ntfs_subr.c,v 1.64 2021/05/13 08:57:29 hannken Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/kauth.h>

#include <miscfs/specfs/specdev.h>

#include <fs/ntfs/ntfs.h>
#include <fs/ntfs/ntfsmount.h>
#include <fs/ntfs/ntfs_inode.h>
#include <fs/ntfs/ntfs_vfsops.h>
#include <fs/ntfs/ntfs_subr.h>
#include <fs/ntfs/ntfs_compr.h>
#include <fs/ntfs/ntfs_ihash.h>

#ifdef NTFS_DEBUG
int ntfs_debug = NTFS_DEBUG;
#endif

MALLOC_JUSTDEFINE(M_NTFSNTVATTR, "NTFS vattr",
"NTFS file attribute information");
MALLOC_JUSTDEFINE(M_NTFSRDATA, "NTFS res data", "NTFS resident data");
MALLOC_JUSTDEFINE(M_NTFSRUN, "NTFS vrun", "NTFS vrun storage");
MALLOC_JUSTDEFINE(M_NTFSDECOMP, "NTFS decomp", "NTFS decompression temporary");

/* Local struct used in ntfs_ntlookupfile() */
struct ntfs_lookup_ctx {
u_int32_t aoff;
u_int32_t rdsize;
cn_t cn;
struct ntfs_lookup_ctx *prev;
};

static int ntfs_ntlookupattr(struct ntfsmount *, const char *, int,
int *, char **);
static int ntfs_findvattr(struct ntfsmount *, struct ntnode *,
struct ntvattr **, struct ntvattr **, u_int32_t, const char *,
size_t, cn_t);
static int ntfs_uastricmp(struct ntfsmount *, const wchar *, size_t,
const char *, size_t);
static int ntfs_uastrcmp(struct ntfsmount *, const wchar *, size_t,
const char *, size_t);

/* table for mapping Unicode chars into uppercase; it's filled upon first
* ntfs mount, freed upon last ntfs umount */
static wchar *ntfs_toupper_tab;
#define NTFS_U28(ch) ((((ch) & 0xE0) == 0) ? '_' : (ch) & 0xFF)
#define NTFS_TOUPPER(ch) (ntfs_toupper_tab[(unsigned char)(ch)])
static kmutex_t ntfs_toupper_lock;
static signed int ntfs_toupper_usecount;

/* support macro for ntfs_ntvattrget() */
#define NTFS_AALPCMP(aalp,type,name,namelen) ( \
(aalp->al_type == type) && (aalp->al_namelen == namelen) && \
!ntfs_uastrcmp(ntmp, aalp->al_name,aalp->al_namelen,name,namelen) )

int
ntfs_ntvattrrele(struct ntvattr *vap)
{
dprintf(("%s: ino: %llu, type: 0x%x\n", __func__,
(unsigned long long)vap->va_ip->i_number, vap->va_type));
ntfs_ntrele(vap->va_ip);
return (0);
}

/*
* find the attribute in the ntnode
*/
static int
ntfs_findvattr(struct ntfsmount *ntmp, struct ntnode *ip, struct ntvattr **lvapp,
struct ntvattr **vapp, u_int32_t type, const char *name, size_t namelen,
cn_t vcn)
{
int error;
struct ntvattr *vap;

if ((ip->i_flag & IN_LOADED) == 0) {
dprintf(("%s: node not loaded, ino: %llu\n", __func__,
(unsigned long long)ip->i_number));
error = ntfs_loadntnode(ntmp,ip);
if (error) {
printf("%s: FAILED TO LOAD INO: %llu\n", __func__,
(unsigned long long)ip->i_number);
return (error);
}
}

*lvapp = NULL;
*vapp = NULL;
for (vap = ip->i_valist.lh_first; vap; vap = vap->va_list.le_next) {
ddprintf(("%s: type: 0x%x, vcn: %qu - %qu\n", __func__,
vap->va_type, (long long) vap->va_vcnstart,
(long long) vap->va_vcnend));
if ((vap->va_type == type) &&
(vap->va_vcnstart <= vcn) && (vap->va_vcnend >= vcn) &&
(vap->va_namelen == namelen) &&
(strncmp(name, vap->va_name, namelen) == 0)) {
*vapp = vap;
ntfs_ntref(vap->va_ip);
return (0);
}
if (vap->va_type == NTFS_A_ATTRLIST)
*lvapp = vap;
}

return (-1);
}

/*
* Search attribute specified in ntnode (load ntnode if necessary).
* If not found but ATTR_A_ATTRLIST present, read it in and search through.
*
* ntnode should be locked
*/
int
ntfs_ntvattrget(struct ntfsmount *ntmp, struct ntnode *ip, u_int32_t type,
const char *name, cn_t vcn, struct ntvattr **vapp)
{
struct ntvattr *lvap = NULL;
struct attr_attrlist *aalp;
struct attr_attrlist *nextaalp;
struct ntnode *newip;
void *alpool;
size_t namelen, len;
int error;

*vapp = NULL;

if (name) {
dprintf(("%s: ino: %llu, type: 0x%x, name: %s, vcn: %qu\n",
__func__, (unsigned long long)ip->i_number, type, name,
(long long)vcn));
namelen = strlen(name);
} else {
dprintf(("%s: ino: %llu, type: 0x%x, vcn: %qu\n", __func__,
(unsigned long long)ip->i_number, type, (long long)vcn));
name = "";
namelen = 0;
}

error = ntfs_findvattr(ntmp, ip, &lvap, vapp, type, name, namelen, vcn);
if (error >= 0)
return (error);

if (!lvap) {
dprintf(("%s: NON-EXISTENT ATTRIBUTE: "
"ino: %llu, type: 0x%x, name: %s, vcn: %qu\n", __func__,
(unsigned long long)ip->i_number, type, name,
(long long)vcn));
return (ENOENT);
}
/* Scan $ATTRIBUTE_LIST for requested attribute */
len = lvap->va_datalen;
alpool = malloc(len, M_TEMP, M_WAITOK);
error = ntfs_readntvattr_plain(ntmp, ip, lvap, 0, len, alpool, &len,
NULL);
if (error)
goto out;

aalp = (struct attr_attrlist *) alpool;
nextaalp = NULL;

for (; len > 0; aalp = nextaalp) {
KASSERT(aalp != NULL);
dprintf(("%s: attrlist: ino: %d, attr: 0x%x, vcn: %qu\n",
__func__, aalp->al_inumber, aalp->al_type,
(long long) aalp->al_vcnstart));

if (len > aalp->reclen) {
nextaalp = NTFS_NEXTREC(aalp, struct attr_attrlist *);
} else {
nextaalp = NULL;
}
len -= aalp->reclen;

if (!NTFS_AALPCMP(aalp, type, name, namelen) ||
(nextaalp && (nextaalp->al_vcnstart <= vcn) &&
NTFS_AALPCMP(nextaalp, type, name, namelen)))
continue;

dprintf(("%s: attribute in ino: %d\n", __func__,
aalp->al_inumber));

error = ntfs_ntlookup(ntmp, aalp->al_inumber, &newip);
if (error) {
printf("%s: can't lookup ino %d"
" for %" PRId64 " attr %x: error %d\n", __func__,
aalp->al_inumber, ip->i_number, type, error);
goto out;
}
/* XXX have to lock ntnode */
error = ntfs_findvattr(ntmp, newip, &lvap, vapp,
type, name, namelen, vcn);
ntfs_ntput(newip);
if (error == 0)
goto out;
printf("%s: ATTRLIST ERROR.\n", __func__);
break;
}
error = ENOENT;

dprintf(("%s: NON-EXISTENT ATTRIBUTE: ino: %llu, type: 0x%x, "
"name: %.*s, vcn: %qu\n", __func__,
(unsigned long long)ip->i_number, type, (int)namelen,
name, (long long)vcn));
out:
free(alpool, M_TEMP);
return (error);
}

/*
* Read ntnode from disk, make ntvattr list.
*
* ntnode should be locked
*/
int
ntfs_loadntnode(struct ntfsmount *ntmp, struct ntnode *ip)
{
struct filerec *mfrp;
int error, off;
struct attr *ap;
struct ntvattr *nvap;

dprintf(("%s: loading ino: %llu\n", __func__,
(unsigned long long)ip->i_number));

mfrp = malloc(ntfs_bntob(ntmp->ntm_bpmftrec), M_TEMP, M_WAITOK);

if (ip->i_number < NTFS_SYSNODESNUM ||
ntmp->ntm_sysvn[NTFS_MFTINO] == NULL) {
struct buf *bp;
daddr_t bn;
off_t boff;
size_t resid, l;
char *data;

dprintf(("%s: read system node\n", __func__));

/*
* Make sure we always read full cluster to
* prevent buffer cache inconsistency.
*/
boff = ntfs_cntob(ntmp->ntm_mftcn) +
ntfs_bntob(ntmp->ntm_bpmftrec) * ip->i_number;
bn = ntfs_cntobn(ntfs_btocn(boff));
boff = ntfs_btocnoff(boff);
resid = ntfs_bntob(ntmp->ntm_bpmftrec);
data = (char *)mfrp;
while (resid > 0) {
l = MIN(resid, ntfs_cntob(1) - boff);

error = bread(ntmp->ntm_devvp, bn, ntfs_cntob(1),
0, &bp);
if (error) {
printf("%s: BREAD FAILED\n", __func__);
goto out;
}
memcpy(data, (char *)bp->b_data + boff, l);
bqrelse(bp);

bn += ntfs_cntobn(1);
boff = 0;
data += l;
resid -= l;
}
} else {
struct vnode *vp;

vp = ntmp->ntm_sysvn[NTFS_MFTINO];
error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
ip->i_number * ntfs_bntob(ntmp->ntm_bpmftrec),
ntfs_bntob(ntmp->ntm_bpmftrec), mfrp, NULL);
if (error) {
printf("%s: ntfs_readattr failed\n", __func__);
goto out;
}
}

/* Check if magic and fixups are correct */
error = ntfs_procfixups(ntmp, NTFS_FILEMAGIC, (void *)mfrp,
ntfs_bntob(ntmp->ntm_bpmftrec));
if (error) {
printf("%s: BAD MFT RECORD %d\n", __func__,
(u_int32_t) ip->i_number);
goto out;
}

dprintf(("%s: load attrs for ino: %llu\n", __func__,
(unsigned long long)ip->i_number));
off = mfrp->fr_attroff;
ap = (struct attr *) ((char *)mfrp + off);

LIST_INIT(&ip->i_valist);

while (ap->a_hdr.a_type != -1) {
error = ntfs_attrtontvattr(ntmp, &nvap, ap);
if (error)
break;
nvap->va_ip = ip;

LIST_INSERT_HEAD(&ip->i_valist, nvap, va_list);

off += ap->a_hdr.reclen;
ap = (struct attr *) ((char *)mfrp + off);
}
if (error) {
printf("%s: failed to load attr ino: %llu\n", __func__,
(unsigned long long)ip->i_number);
goto out;
}

ip->i_mainrec = mfrp->fr_mainrec;
ip->i_nlink = mfrp->fr_nlink;
ip->i_frflag = mfrp->fr_flags;

ip->i_flag |= IN_LOADED;

out:
free(mfrp, M_TEMP);
return (error);
}

/*
* Routine locks ntnode and increase usecount, just opposite of
* ntfs_ntput().
*/
int
ntfs_ntget(struct ntnode *ip)
{
dprintf(("%s: get ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ip->i_number, ip, ip->i_usecount));

mutex_enter(&ip->i_interlock);
ip->i_usecount++;
while (ip->i_busy != 0) {
cv_wait(&ip->i_lock, &ip->i_interlock);
}
ip->i_busy = 1;
mutex_exit(&ip->i_interlock);

return 0;
}

/*
* Routine search ntnode in hash, if found: lock, inc usecount and return.
* If not in hash allocate structure for ntnode, prefill it, lock,
* inc count and return.
*
* ntnode returned locked
*/
int
ntfs_ntlookup(struct ntfsmount *ntmp, ino_t ino, struct ntnode **ipp)
{
struct ntnode *ip;

dprintf(("%s: looking for ntnode %llu\n", __func__,
(unsigned long long)ino));

if ((*ipp = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
ntfs_ntget(*ipp);
dprintf(("%s: ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ino, *ipp, (*ipp)->i_usecount));
return (0);
}

ip = malloc(sizeof(*ip), M_NTFSNTNODE, M_WAITOK|M_ZERO);
ddprintf(("%s: allocating ntnode: %llu: %p\n", __func__,
(unsigned long long)ino, ip));

mutex_enter(&ntfs_hashlock);
if ((*ipp = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
mutex_exit(&ntfs_hashlock);
ntfs_ntget(*ipp);
free(ip, M_NTFSNTNODE);
dprintf(("%s: ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ino, *ipp, (*ipp)->i_usecount));
return (0);
}

/* Generic initialization */
ip->i_devvp = ntmp->ntm_devvp;
ip->i_dev = ntmp->ntm_dev;
ip->i_number = ino;
ip->i_mp = ntmp;

/* init lock and lock the newborn ntnode */
cv_init(&ip->i_lock, "ntfslk");
mutex_init(&ip->i_interlock, MUTEX_DEFAULT, IPL_NONE);
ntfs_ntget(ip);

ntfs_nthashins(ip);

mutex_exit(&ntfs_hashlock);

*ipp = ip;

dprintf(("%s: ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ino, ip, ip->i_usecount));

return (0);
}

/*
* Decrement usecount of ntnode and unlock it, if usecount reaches zero,
* deallocate ntnode.
*
* ntnode should be locked on entry, and unlocked on return.
*/
void
ntfs_ntput(struct ntnode *ip)
{
struct ntvattr *vap;

dprintf(("%s: rele ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ip->i_number, ip, ip->i_usecount));

mutex_enter(&ip->i_interlock);
ip->i_usecount--;

#ifdef DIAGNOSTIC
if (ip->i_usecount < 0) {
panic("ntfs_ntput: ino: %llu usecount: %d ",
(unsigned long long)ip->i_number, ip->i_usecount);
}
#endif

ip->i_busy = 0;
cv_signal(&ip->i_lock);
mutex_exit(&ip->i_interlock);

if (ip->i_usecount == 0) {
dprintf(("%s: deallocating ntnode: %llu\n", __func__,
(unsigned long long)ip->i_number));

ntfs_nthashrem(ip);

while (ip->i_valist.lh_first != NULL) {
vap = ip->i_valist.lh_first;
LIST_REMOVE(vap,va_list);
ntfs_freentvattr(vap);
}
mutex_destroy(&ip->i_interlock);
cv_destroy(&ip->i_lock);
free(ip, M_NTFSNTNODE);
}
}

/*
* increment usecount of ntnode
*/
void
ntfs_ntref(struct ntnode *ip)
{
mutex_enter(&ip->i_interlock);
ip->i_usecount++;
mutex_exit(&ip->i_interlock);

dprintf(("%s: ino %llu, usecount: %d\n", __func__,
(unsigned long long)ip->i_number, ip->i_usecount));
}

/*
* Decrement usecount of ntnode.
*/
void
ntfs_ntrele(struct ntnode *ip)
{
dprintf(("%s: rele ntnode %llu: %p, usecount: %d\n", __func__,
(unsigned long long)ip->i_number, ip, ip->i_usecount));

mutex_enter(&ip->i_interlock);
ip->i_usecount--;

if (ip->i_usecount < 0)
panic("%s: ino: %llu usecount: %d ", __func__,
(unsigned long long)ip->i_number, ip->i_usecount);
mutex_exit(&ip->i_interlock);
}

/*
* Deallocate all memory allocated for ntvattr
*/
void
ntfs_freentvattr(struct ntvattr *vap)
{
if (vap->va_flag & NTFS_AF_INRUN) {
if (vap->va_vruncn)
free(vap->va_vruncn, M_NTFSRUN);
if (vap->va_vruncl)
free(vap->va_vruncl, M_NTFSRUN);
} else {
if (vap->va_datap)
free(vap->va_datap, M_NTFSRDATA);
}
free(vap, M_NTFSNTVATTR);
}

/*
* Convert disk image of attribute into ntvattr structure,
* runs are expanded also.
*/
int
ntfs_attrtontvattr(struct ntfsmount *ntmp, struct ntvattr **rvapp,
struct attr *rap)
{
int error, i;
struct ntvattr *vap;

error = 0;
*rvapp = NULL;

vap = malloc(sizeof(*vap), M_NTFSNTVATTR, M_WAITOK|M_ZERO);
vap->va_ip = NULL;
vap->va_flag = rap->a_hdr.a_flag;
vap->va_type = rap->a_hdr.a_type;
vap->va_compression = rap->a_hdr.a_compression;
vap->va_index = rap->a_hdr.a_index;

ddprintf(("%s: type: 0x%x, index: %d", __func__,
vap->va_type, vap->va_index));

vap->va_namelen = rap->a_hdr.a_namelen;
if (rap->a_hdr.a_namelen) {
wchar *unp = (wchar *)((char *)rap + rap->a_hdr.a_nameoff);
ddprintf((", name:["));
for (i = 0; i < vap->va_namelen; i++) {
vap->va_name[i] = unp[i];
ddprintf(("%c", vap->va_name[i]));
}
ddprintf(("]"));
}
if (vap->va_flag & NTFS_AF_INRUN) {
ddprintf((", nonres."));
vap->va_datalen = rap->a_nr.a_datalen;
vap->va_allocated = rap->a_nr.a_allocated;
vap->va_vcnstart = rap->a_nr.a_vcnstart;
vap->va_vcnend = rap->a_nr.a_vcnend;
vap->va_compressalg = rap->a_nr.a_compressalg;
error = ntfs_runtovrun(&(vap->va_vruncn), &(vap->va_vruncl),
&(vap->va_vruncnt),
(u_int8_t *) rap + rap->a_nr.a_dataoff);
} else {
vap->va_compressalg = 0;
ddprintf((", res."));
vap->va_datalen = rap->a_r.a_datalen;
vap->va_allocated = rap->a_r.a_datalen;
vap->va_vcnstart = 0;
vap->va_vcnend = ntfs_btocn(vap->va_allocated);
vap->va_datap = malloc(vap->va_datalen, M_NTFSRDATA, M_WAITOK);
memcpy(vap->va_datap, (char *)rap + rap->a_r.a_dataoff,
rap->a_r.a_datalen);
}
ddprintf((", len: %qu", (long long)vap->va_datalen));

if (error)
free(vap, M_NTFSNTVATTR);
else
*rvapp = vap;

ddprintf(("\n"));

return (error);
}

/*
* Expand run into more utilizable and more memory eating format.
*/
int
ntfs_runtovrun(cn_t **rcnp, cn_t **rclp, u_long *rcntp, u_int8_t *run)
{
u_int32_t off, sz, i;
cn_t *cn, *cl;
u_long cnt;
cn_t prev, tmp;

off = 0;
cnt = 0;
i = 0;
while (run[off]) {
off += (run[off] & 0xF) + ((run[off] >> 4) & 0xF) + 1;
cnt++;
}
cn = malloc(cnt * sizeof(*cn), M_NTFSRUN, M_WAITOK);
cl = malloc(cnt * sizeof(*cl), M_NTFSRUN, M_WAITOK);

off = 0;
cnt = 0;
prev = 0;
while (run[off]) {
sz = run[off++];
cl[cnt] = 0;

for (i = 0; i < (sz & 0xF); i++)
cl[cnt] += (u_int32_t) run[off++] << (i << 3);

sz >>= 4;
if (run[off + sz - 1] & 0x80) {
tmp = ((u_int64_t) - 1) << (sz << 3);
for (i = 0; i < sz; i++)
tmp |= (u_int64_t) run[off++] << (i << 3);
} else {
tmp = 0;
for (i = 0; i < sz; i++)
tmp |= (u_int64_t) run[off++] << (i << 3);
}
if (tmp)
prev = cn[cnt] = prev + tmp;
else
cn[cnt] = tmp;

cnt++;
}
*rcnp = cn;
*rclp = cl;
*rcntp = cnt;
return (0);
}

/*
* Compare unicode and ascii string case insens.
*/
static int
ntfs_uastricmp(struct ntfsmount *ntmp, const wchar *ustr, size_t ustrlen,
const char *astr, size_t astrlen)
{
size_t i;
int res;

for (i = 0; i < ustrlen && astrlen > 0; i++) {
res = (*ntmp->ntm_wcmp)(NTFS_TOUPPER(ustr[i]),
NTFS_TOUPPER((*ntmp->ntm_wget)(&astr, &astrlen)) );
if (res)
return res;
}

if (i == ustrlen && astrlen == 0)
return 0;
else if (i == ustrlen)
return -1;
else
return 1;
}

/*
* Compare unicode and ascii string case sens.
*/
static int
ntfs_uastrcmp(struct ntfsmount *ntmp, const wchar *ustr, size_t ustrlen,
const char *astr, size_t astrlen)
{
size_t i;
int res;

for (i = 0; (i < ustrlen) && astrlen > 0; i++) {
res = (*ntmp->ntm_wcmp)(ustr[i],
(*ntmp->ntm_wget)(&astr, &astrlen));
if (res)
return res;
}

if (i == ustrlen && astrlen == 0)
return 0;
else if (i == ustrlen)
return -1;
else
return 1;
}

/*
* Lookup attribute name in format: [[:$ATTR_TYPE]:$ATTR_NAME],
* $ATTR_TYPE is searched in attrdefs read from $AttrDefs.
* If $ATTR_TYPE not specified, ATTR_A_DATA assumed.
*/
static int
ntfs_ntlookupattr(struct ntfsmount *ntmp, const char *name, int namelen,
int *attrtype, char **attrname)
{
const char *sys;
size_t syslen, i;
struct ntvattrdef *adp;

if (namelen == 0)
return (0);

if (name[0] == '$') {
sys = name;
for (syslen = 0; syslen < namelen; syslen++) {
if (sys[syslen] == ':') {
name++;
namelen--;
break;
}
}
name += syslen;
namelen -= syslen;

adp = ntmp->ntm_ad;
for (i = 0; i < ntmp->ntm_adnum; i++, adp++){
if (syslen != adp->ad_namelen ||
strncmp(sys, adp->ad_name, syslen) != 0)
continue;

*attrtype = adp->ad_type;
goto out;
}
return (ENOENT);
} else
*attrtype = NTFS_A_DATA;

out:
if (namelen) {
*attrname = malloc(namelen+1, M_TEMP, M_WAITOK);
memcpy((*attrname), name, namelen);
(*attrname)[namelen] = '\0';
}

return (0);
}

/*
* Lookup specified node for filename, matching cnp,
* return referenced vnode with fnode filled.
*/
int
ntfs_ntlookupfile(struct ntfsmount *ntmp, struct vnode *vp,
struct componentname *cnp, struct vnode **vpp)
{
struct fnode *fp = VTOF(vp);
struct ntnode *ip = FTONT(fp);
struct ntvattr *vap = NULL; /* Root attribute */
cn_t cn = 0; /* VCN in current attribute */
void * rdbuf = NULL; /* Buffer to read directory's blocks */
u_int32_t blsize;
u_int32_t rdsize; /* Length of data to read from current block */
struct attr_indexentry *iep;
int error, res, anamelen, fnamelen;
const char *fname,*aname;
u_int32_t aoff;
int attrtype = NTFS_A_DATA;
char *attrname = NULL;
struct vnode *nvp;
int fullscan = 0;
struct ntfs_lookup_ctx *lookup_ctx = NULL, *tctx;

error = ntfs_ntget(ip);
if (error)
return (error);

error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
if (error || (vap->va_flag & NTFS_AF_INRUN)) {
error = ENOTDIR;
goto fail;
}

/*
* Divide file name into: foofilefoofilefoofile[:attrspec]
* Store like this: fname:fnamelen [aname:anamelen]
*/
fname = cnp->cn_nameptr;
aname = NULL;
anamelen = 0;
for (fnamelen = 0; fnamelen < cnp->cn_namelen; fnamelen++)
if (fname[fnamelen] == ':') {
aname = fname + fnamelen + 1;
anamelen = cnp->cn_namelen - fnamelen - 1;
dprintf(("%s: %s (%d), attr: %s (%d)\n", __func__,
fname, fnamelen, aname, anamelen));
break;
}

blsize = vap->va_a_iroot->ir_size;
dprintf(("%s: blksz: %d\n", __func__, blsize));
rdbuf = malloc(blsize, M_TEMP, M_WAITOK);

loop:
rdsize = vap->va_datalen;
dprintf(("%s: rdsz: %d\n", __func__, rdsize));

error = ntfs_readattr(ntmp, ip, NTFS_A_INDXROOT, "$I30",
0, rdsize, rdbuf, NULL);
if (error)
goto fail;

aoff = sizeof(struct attr_indexroot);

do {
iep = (struct attr_indexentry *) ((char *)rdbuf + aoff);

for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
aoff += iep->reclen,
iep = (struct attr_indexentry *) ((char *)rdbuf + aoff))
{
ddprintf(("%s: fscan: %d, %d\n", __func__,
(u_int32_t) iep->ie_number,
(u_int32_t) iep->ie_fnametype));

/* check the name - the case-insensitive check
* has to come first, to break from this for loop
* if needed, so we can dive correctly */
res = ntfs_uastricmp(ntmp, iep->ie_fname,
iep->ie_fnamelen, fname, fnamelen);
if (!fullscan) {
if (res > 0)
break;
if (res < 0)
continue;
}

if (iep->ie_fnametype == 0 ||
!(ntmp->ntm_flag & NTFS_MFLAG_CASEINS))
{
res = ntfs_uastrcmp(ntmp, iep->ie_fname,
iep->ie_fnamelen, fname, fnamelen);
if (res != 0 && !fullscan)
continue;
}

/* if we perform full scan, the file does not match
* and this is subnode, dive */
if (fullscan && res != 0) {
if (iep->ie_flag & NTFS_IEFLAG_SUBNODE) {
tctx = malloc(sizeof(*tctx), M_TEMP,
M_WAITOK);
tctx->aoff = aoff + iep->reclen;
tctx->rdsize = rdsize;
tctx->cn = cn;
tctx->prev = lookup_ctx;
lookup_ctx = tctx;
break;
} else
continue;
}

if (aname) {
error = ntfs_ntlookupattr(ntmp, aname, anamelen,
&attrtype, &attrname);
if (error)
goto fail;
}

/* Check if we've found ourselves */
if ((iep->ie_number == ip->i_number) &&
(attrtype == fp->f_attrtype) &&
!strcmp(attrname ? attrname : "", fp->f_attrname))
{
vref(vp);
*vpp = vp;
error = 0;
goto fail;
}

/* vget node */
error = ntfs_vgetex(ntmp->ntm_mountp, iep->ie_number,
attrtype, attrname ? attrname : "", 0, &nvp);

/* free the buffer returned by ntfs_ntlookupattr() */
if (attrname) {
free(attrname, M_TEMP);
attrname = NULL;
}

if (error)
goto fail;

*vpp = nvp;
goto fail;
}

/* Dive if possible */
if (iep->ie_flag & NTFS_IEFLAG_SUBNODE) {
dprintf(("%s: diving\n", __func__));

cn = *(cn_t *) ((char *)rdbuf + aoff +
iep->reclen - sizeof(cn_t));
rdsize = blsize;

error = ntfs_readattr(ntmp, ip, NTFS_A_INDX, "$I30",
ntfs_cntob(cn), rdsize, rdbuf, NULL);
if (error)
goto fail;

error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
rdbuf, rdsize);
if (error)
goto fail;

aoff = (((struct attr_indexalloc *) rdbuf)->ia_hdrsize +
0x18);
} else if (fullscan && lookup_ctx) {
cn = lookup_ctx->cn;
aoff = lookup_ctx->aoff;
rdsize = lookup_ctx->rdsize;

error = ntfs_readattr(ntmp, ip,
(cn == 0) ? NTFS_A_INDXROOT : NTFS_A_INDX,
"$I30", ntfs_cntob(cn), rdsize, rdbuf, NULL);
if (error)
goto fail;

if (cn != 0) {
error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
rdbuf, rdsize);
if (error)
goto fail;
}

tctx = lookup_ctx;
lookup_ctx = lookup_ctx->prev;
free(tctx, M_TEMP);
} else {
dprintf(("%s: nowhere to dive :-(\n", __func__));
error = ENOENT;
break;
}
} while (1);

/* perform full scan if no entry was found */
if (!fullscan && error == ENOENT) {
fullscan = 1;
cn = 0; /* need zero, used by lookup_ctx */

ddprintf(("%s: fullscan performed for: %.*s\n", __func__,
(int) fnamelen, fname));
goto loop;
}

dprintf(("finish\n"));

fail:
if (attrname)
free(attrname, M_TEMP);
if (lookup_ctx) {
while(lookup_ctx) {
tctx = lookup_ctx;
lookup_ctx = lookup_ctx->prev;
free(tctx, M_TEMP);
}
}
if (vap)
ntfs_ntvattrrele(vap);
if (rdbuf)
free(rdbuf, M_TEMP);
ntfs_ntput(ip);
return (error);
}

/*
* Check if name type is permitted to show.
*/
int
ntfs_isnamepermitted(struct ntfsmount *ntmp, struct attr_indexentry *iep)
{
if (ntmp->ntm_flag & NTFS_MFLAG_ALLNAMES)
return 1;

switch (iep->ie_fnametype) {
case 2:
ddprintf(("%s: skipped DOS name\n", __func__));
return 0;
case 0: case 1: case 3:
return 1;
default:
printf("%s: WARNING! Unknown file name type: %d\n", __func__,
iep->ie_fnametype);
break;
}
return 0;
}

/*
* Read ntfs dir like stream of attr_indexentry, not like btree of them.
* This is done by scanning $BITMAP:$I30 for busy clusters and reading them.
* Of course $INDEX_ROOT:$I30 is read before. Last read values are stored in
* fnode, so we can skip toward record number num almost immediately.
* Anyway this is rather slow routine. The problem is that we don't know
* how many records are there in $INDEX_ALLOCATION:$I30 block.
*/
int
ntfs_ntreaddir(struct ntfsmount *ntmp, struct fnode *fp, u_int32_t num,
struct attr_indexentry **riepp)
{
struct ntnode *ip = FTONT(fp);
struct ntvattr *vap = NULL; /* IndexRoot attribute */
struct ntvattr *bmvap = NULL; /* BitMap attribute */
struct ntvattr *iavap = NULL; /* IndexAllocation attribute */
void * rdbuf; /* Buffer to read directory's blocks */
u_char *bmp = NULL; /* Bitmap */
u_int32_t blsize; /* Index allocation size (2048) */
u_int32_t rdsize; /* Length of data to read */
u_int32_t attrnum; /* Current attribute type */
u_int32_t cpbl = 1; /* Clusters per directory block */
u_int32_t blnum;
struct attr_indexentry *iep;
int error = ENOENT;
u_int32_t aoff, cnum;

dprintf(("%s: read ino: %llu, num: %d\n", __func__,
(unsigned long long)ip->i_number, num));
error = ntfs_ntget(ip);
if (error)
return (error);

error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
if (error) {
error = ENOTDIR;
goto fail;
}

if (fp->f_dirblbuf == NULL) {
fp->f_dirblsz = vap->va_a_iroot->ir_size;
fp->f_dirblbuf = malloc(MAX(vap->va_datalen, fp->f_dirblsz),
M_NTFSDIR, M_WAITOK);
}

blsize = fp->f_dirblsz;
rdbuf = fp->f_dirblbuf;

dprintf(("%s: rdbuf: %p, blsize: %d\n", __func__, rdbuf, blsize));

if (vap->va_a_iroot->ir_flag & NTFS_IRFLAG_INDXALLOC) {
error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXBITMAP, "$I30",
0, &bmvap);
if (error) {
error = ENOTDIR;
goto fail;
}
bmp = (u_char *) malloc(bmvap->va_datalen, M_TEMP, M_WAITOK);
error = ntfs_readattr(ntmp, ip, NTFS_A_INDXBITMAP, "$I30", 0,
bmvap->va_datalen, bmp, NULL);
if (error)
goto fail;

error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDX, "$I30",
0, &iavap);
if (error) {
error = ENOTDIR;
goto fail;
}
cpbl = ntfs_btocn(blsize + ntfs_cntob(1) - 1);
dprintf(("%s: indexalloc: %qu, cpbl: %d\n", __func__,
(long long)iavap->va_datalen, cpbl));
} else {
dprintf(("%s: w/o BitMap and IndexAllocation\n", __func__));
iavap = bmvap = NULL;
bmp = NULL;
}

/* Try use previous values */
if ((fp->f_lastdnum < num) && (fp->f_lastdnum != 0)) {
attrnum = fp->f_lastdattr;
aoff = fp->f_lastdoff;
blnum = fp->f_lastdblnum;
cnum = fp->f_lastdnum;
} else {
attrnum = NTFS_A_INDXROOT;
aoff = sizeof(struct attr_indexroot);
blnum = 0;
cnum = 0;
}

do {
dprintf(("%s: scan: 0x%x, %d, %d, %d, %d\n", __func__,
attrnum, (u_int32_t) blnum, cnum, num, aoff));
rdsize = (attrnum == NTFS_A_INDXROOT) ? vap->va_datalen : blsize;
error = ntfs_readattr(ntmp, ip, attrnum, "$I30",
ntfs_cntob(blnum * cpbl), rdsize, rdbuf, NULL);
if (error)
goto fail;

if (attrnum == NTFS_A_INDX) {
error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
rdbuf, rdsize);
if (error)
goto fail;
}
if (aoff == 0)
aoff = (attrnum == NTFS_A_INDX) ?
(0x18 + ((struct attr_indexalloc *) rdbuf)->ia_hdrsize) :
sizeof(struct attr_indexroot);

iep = (struct attr_indexentry *) ((char *)rdbuf + aoff);
for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
aoff += iep->reclen,
iep = (struct attr_indexentry *) ((char *)rdbuf + aoff))
{
if (!ntfs_isnamepermitted(ntmp, iep))
continue;
if (cnum >= num) {
fp->f_lastdnum = cnum;
fp->f_lastdoff = aoff;
fp->f_lastdblnum = blnum;
fp->f_lastdattr = attrnum;

*riepp = iep;

error = 0;
goto fail;
}
cnum++;
}

if (iavap) {
if (attrnum == NTFS_A_INDXROOT)
blnum = 0;
else
blnum++;

while (ntfs_cntob(blnum * cpbl) < iavap->va_datalen) {
if (bmp[blnum >> 3] & (1 << (blnum & 3)))
break;
blnum++;
}

attrnum = NTFS_A_INDX;
aoff = 0;
if (ntfs_cntob(blnum * cpbl) >= iavap->va_datalen)
break;
dprintf(("%s: blnum: %d\n", __func__,
(u_int32_t) blnum));
}
} while (iavap);

*riepp = NULL;
fp->f_lastdnum = 0;

fail:
if (vap)
ntfs_ntvattrrele(vap);
if (bmvap)
ntfs_ntvattrrele(bmvap);
if (iavap)
ntfs_ntvattrrele(iavap);
if (bmp)
free(bmp, M_TEMP);
ntfs_ntput(ip);
return (error);
}

/*
* Convert NTFS times that are in 100 ns units and begins from
* 1601 Jan 1 into unix times.
*/
struct timespec
ntfs_nttimetounix(u_int64_t nt)
{
struct timespec t;

/* WindowNT times are in 100 ns and from 1601 Jan 1 */
t.tv_nsec = (nt % (1000 * 1000 * 10)) * 100;
t.tv_sec = nt / (1000 * 1000 * 10) -
369LL * 365LL * 24LL * 60LL * 60LL -
89LL * 1LL * 24LL * 60LL * 60LL;
return (t);
}

/*
* This is one of the write routines.
*/
int
ntfs_writeattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
u_int32_t attrnum, char *attrname, off_t roff, size_t rsize, void *rdata,
size_t *initp, struct uio *uio)
{
size_t init;
int error = 0;
off_t off = roff, left = rsize, towrite;
void *data = rdata;
struct ntvattr *vap;
*initp = 0;

while (left) {
error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
ntfs_btocn(off), &vap);
if (error)
return (error);
towrite = MIN(left, ntfs_cntob(vap->va_vcnend + 1) - off);
ddprintf(("%s: o: %qd, s: %qd (%qu - %qu)\n", __func__,
(long long) off, (long long) towrite,
(long long) vap->va_vcnstart,
(long long) vap->va_vcnend));
error = ntfs_writentvattr_plain(ntmp, ip, vap,
off - ntfs_cntob(vap->va_vcnstart),
towrite, data, &init, uio);
if (error) {
dprintf(("%s: "
"ntfs_writentvattr_plain failed: o: %qd, s: %qd\n",
__func__, (long long) off, (long long) towrite));
dprintf(("%s: attrib: %qu - %qu\n", __func__,
(long long) vap->va_vcnstart,
(long long) vap->va_vcnend));
ntfs_ntvattrrele(vap);
break;
}
ntfs_ntvattrrele(vap);
left -= towrite;
off += towrite;
data = (char *)data + towrite;
*initp += init;
}

return (error);
}

/*
* This is one of the write routines.
*
* ntnode should be locked.
*/
int
ntfs_writentvattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
struct ntvattr *vap, off_t roff, size_t rsize, void *rdata, size_t *initp,
struct uio *uio)
{
int error = 0;
off_t off;
int cnt;
cn_t ccn, ccl, cn, left, cl;
void *data = rdata;
daddr_t lbn;
struct buf *bp;
size_t tocopy;

*initp = 0;

if ((vap->va_flag & NTFS_AF_INRUN) == 0) {
dprintf(("%s: CAN'T WRITE RES. ATTRIBUTE\n", __func__));
return ENOTTY;
}

ddprintf(("%s: data in run: %lu chains\n", __func__,
vap->va_vruncnt));

off = roff;
left = rsize;
ccl = 0;
ccn = 0;
cnt = 0;
for (; left && (cnt < vap->va_vruncnt); cnt++) {
ccn = vap->va_vruncn[cnt];
ccl = vap->va_vruncl[cnt];

ddprintf(("%s: left %qu, cn: 0x%qx, cl: %qu, off: %qd\n",
__func__, (long long) left, (long long) ccn,
(long long) ccl, (long long) off));

if (ntfs_cntob(ccl) < off) {
off -= ntfs_cntob(ccl);
cnt++;
continue;
}
if (!ccn && ip->i_number != NTFS_BOOTINO)
continue; /* XXX */

ccl -= ntfs_btocn(off);
cn = ccn + ntfs_btocn(off);
off = ntfs_btocnoff(off);

while (left && ccl) {
/*
* Always read and write single clusters at a time -
* we need to avoid requesting differently-sized
* blocks at the same disk offsets to avoid
* confusing the buffer cache.
*/
tocopy = MIN(left, ntfs_cntob(1) - off);
cl = ntfs_btocl(tocopy + off);
KASSERT(cl == 1 && tocopy <= ntfs_cntob(1));
ddprintf(("%s: write: cn: 0x%qx cl: %qu, off: %qd "
"len: %qu, left: %qu\n", __func__,
(long long) cn, (long long) cl,
(long long) off, (long long) tocopy,
(long long) left));
if ((off == 0) && (tocopy == ntfs_cntob(cl))) {
lbn = ntfs_cntobn(cn);
bp = getblk(ntmp->ntm_devvp, lbn,
ntfs_cntob(cl), 0, 0);
clrbuf(bp);
} else {
error = bread(ntmp->ntm_devvp, ntfs_cntobn(cn),
ntfs_cntob(cl), B_MODIFY, &bp);
if (error)
return (error);
}
if (uio)
uiomove((char *)bp->b_data + off, tocopy, uio);
else
memcpy((char *)bp->b_data + off, data, tocopy);
bawrite(bp);
data = (char *)data + tocopy;
*initp += tocopy;
off = 0;
left -= tocopy;
cn += cl;
ccl -= cl;
}
}

if (left) {
printf("%s: POSSIBLE RUN ERROR\n", __func__);
error = EINVAL;
}

return (error);
}

/*
* This is one of the read routines.
*
* ntnode should be locked.
*/
int
ntfs_readntvattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
struct ntvattr *vap, off_t roff, size_t rsize, void *rdata, size_t *initp,
struct uio *uio)
{
int error = 0;
off_t off;

*initp = 0;
if (vap->va_flag & NTFS_AF_INRUN) {
int cnt;
cn_t ccn, ccl, cn, left, cl;
void *data = rdata;
struct buf *bp;
size_t tocopy;

ddprintf(("%s: data in run: %lu chains\n", __func__,
vap->va_vruncnt));

off = roff;
left = rsize;
ccl = 0;
ccn = 0;
cnt = 0;
while (left && (cnt < vap->va_vruncnt)) {
ccn = vap->va_vruncn[cnt];
ccl = vap->va_vruncl[cnt];

ddprintf(("%s: left %qu, cn: 0x%qx, cl: %qu, "
"off: %qd\n", __func__,
(long long) left, (long long) ccn,
(long long) ccl, (long long) off));

if (ntfs_cntob(ccl) < off) {
off -= ntfs_cntob(ccl);
cnt++;
continue;
}
if (ccn || ip->i_number == NTFS_BOOTINO) {
ccl -= ntfs_btocn(off);
cn = ccn + ntfs_btocn(off);
off = ntfs_btocnoff(off);

while (left && ccl) {
/*
* Always read single clusters at a
* time - we need to avoid reading
* differently-sized blocks at the
* same disk offsets to avoid
* confusing the buffer cache.
*/
tocopy = MIN(left,
ntfs_cntob(1) - off);
cl = ntfs_btocl(tocopy + off);
KASSERT(cl == 1 &&
tocopy <= ntfs_cntob(1));

ddprintf(("%s: read: cn: 0x%qx cl: %qu,"
" off: %qd len: %qu, left: %qu\n",
__func__, (long long) cn,
(long long) cl,
(long long) off,
(long long) tocopy,
(long long) left));
error = bread(ntmp->ntm_devvp,
ntfs_cntobn(cn),
ntfs_cntob(cl),
0, &bp);
if (error) {
return (error);
}
if (uio) {
uiomove((char *)bp->b_data + off,
tocopy, uio);
} else {
memcpy(data, (char *)bp->b_data + off,
tocopy);
}
brelse(bp, 0);
data = (char *)data + tocopy;
*initp += tocopy;
off = 0;
left -= tocopy;
cn += cl;
ccl -= cl;
}
} else {
tocopy = MIN(left, ntfs_cntob(ccl) - off);
ddprintf(("%s: hole: ccn: 0x%qx ccl: %qu, "
"off: %qd, len: %qu, left: %qu\n", __func__,
(long long) ccn, (long long) ccl,
(long long) off, (long long) tocopy,
(long long) left));
left -= tocopy;
off = 0;
if (uio) {
char vbuf[] = "";
size_t remains = tocopy;
for (; remains; remains--)
uiomove(vbuf, 1, uio);
} else
memset(data, 0, tocopy);
data = (char *)data + tocopy;
}
cnt++;
}
if (left) {
printf("%s: POSSIBLE RUN ERROR\n", __func__);
error = E2BIG;
}
} else {
ddprintf(("%s: data is in mft record\n", __func__));
if (uio)
uiomove((char *)vap->va_datap + roff, rsize, uio);
else
memcpy(rdata, (char *)vap->va_datap + roff, rsize);
*initp += rsize;
}

return (error);
}

/*
* This is one of the read routines.
*/
int
ntfs_readattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
u_int32_t attrnum, const char *attrname, off_t roff, size_t rsize,
void *rdata, size_t *initp, struct uio *uio)
{
size_t init;
int error = 0;
off_t off = roff, left = rsize, toread;
void *data = rdata;
struct ntvattr *vap;
*initp = 0;

while (left) {
error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
ntfs_btocn(off), &vap);
if (error)
return (error);
toread = MIN(left, ntfs_cntob(vap->va_vcnend + 1) - off);
ddprintf(("%s: o: %qd, s: %qd (%qu - %qu)\n", __func__,
(long long) off, (long long) toread,
(long long) vap->va_vcnstart,
(long long) vap->va_vcnend));
error = ntfs_readntvattr_plain(ntmp, ip, vap,
off - ntfs_cntob(vap->va_vcnstart),
toread, data, &init, uio);
if (error) {
printf("%s: ntfs_readntvattr_plain failed: o: %qd, "
"s: %qd\n", __func__,
(long long) off, (long long) toread);
printf("%s: attrib: %qu - %qu\n", __func__,
(long long) vap->va_vcnstart,
(long long) vap->va_vcnend);
ntfs_ntvattrrele(vap);
break;
}
ntfs_ntvattrrele(vap);
left -= toread;
off += toread;
data = (char *)data + toread;
*initp += init;
}

return (error);
}

/*
* This is one of the read routines.
*/
int
ntfs_readattr(struct ntfsmount *ntmp, struct ntnode *ip, u_int32_t attrnum,
const char *attrname, off_t roff, size_t rsize, void *rdata,
struct uio *uio)
{
int error = 0;
struct ntvattr *vap;
size_t init;

ddprintf(("%s: reading %llu: 0x%x, from %qd size %qu bytes\n",
__func__, (unsigned long long)ip->i_number, attrnum,
(long long)roff, (long long)rsize));

error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname, 0, &vap);
if (error)
return (error);

if ((roff > vap->va_datalen) ||
(roff + rsize > vap->va_datalen)) {
printf("%s: offset too big: %qd (%qd) > %qu\n", __func__,
(long long) roff, (long long) (roff + rsize),
(long long) vap->va_datalen);
ntfs_ntvattrrele(vap);
return (E2BIG);
}
if (vap->va_compression && vap->va_compressalg) {
u_int8_t *cup, *uup;
off_t off, left, tocopy;
void *data;
cn_t cn;

left = rsize;
data = rdata;
ddprintf(("%s: compression: %d\n", __func__,
vap->va_compressalg));

cup = malloc(ntfs_cntob(NTFS_COMPUNIT_CL),
M_NTFSDECOMP, M_WAITOK);
uup = malloc(ntfs_cntob(NTFS_COMPUNIT_CL),
M_NTFSDECOMP, M_WAITOK);

cn = (ntfs_btocn(roff)) & (~(NTFS_COMPUNIT_CL - 1));
off = roff - ntfs_cntob(cn);

while (left) {
error = ntfs_readattr_plain(ntmp, ip, attrnum,
attrname, ntfs_cntob(cn),
ntfs_cntob(NTFS_COMPUNIT_CL), cup, &init, NULL);
if (error)
break;

tocopy = MIN(left, ntfs_cntob(NTFS_COMPUNIT_CL) - off);

if (init == ntfs_cntob(NTFS_COMPUNIT_CL)) {
if (uio)
uiomove(cup + off, tocopy, uio);
else
memcpy(data, cup + off, tocopy);
} else if (init == 0) {
if (uio) {
char vbuf[] = "";
size_t remains = tocopy;
for (; remains; remains--)
uiomove(vbuf, 1, uio);
}
else
memset(data, 0, tocopy);
} else {
error = ntfs_uncompunit(ntmp, uup, cup);
if (error)
break;
if (uio)
uiomove(uup + off, tocopy, uio);
else
memcpy(data, uup + off, tocopy);
}

left -= tocopy;
data = (char *)data + tocopy;
off += tocopy - ntfs_cntob(NTFS_COMPUNIT_CL);
cn += NTFS_COMPUNIT_CL;
}

free(uup, M_NTFSDECOMP);
free(cup, M_NTFSDECOMP);
} else
error = ntfs_readattr_plain(ntmp, ip, attrnum, attrname,
roff, rsize, rdata, &init, uio);
ntfs_ntvattrrele(vap);
return (error);
}

#if UNUSED_CODE
int
ntfs_parserun(cn_t *cn, cn_t *cl, u_int8_t *run, u_long len, u_long *off)
{
u_int8_t sz;
int i;

if (NULL == run) {
printf("%s: run == NULL\n", __func__);
return (EINVAL);
}
sz = run[(*off)++];
if (0 == sz) {
printf("%s: trying to go out of run\n", __func__);
return (E2BIG);
}
*cl = 0;
if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
printf("%s: bad run: length too big: sz: 0x%02x "
"(%ld < %ld + sz)\n", __func__, sz, len, *off);
return (EINVAL);
}
for (i = 0; i < (sz & 0xF); i++)
*cl += (u_int32_t) run[(*off)++] << (i << 3);

sz >>= 4;
if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
printf("%s: bad run: length too big: sz: 0x%02x "
"(%ld < %ld + sz)\n", __func__, sz, len, *off);
return (EINVAL);
}
for (i = 0; i < (sz & 0xF); i++)
*cn += (u_int32_t) run[(*off)++] << (i << 3);

return (0);
}
#endif

/*
* Process fixup routine on given buffer.
*/
int
ntfs_procfixups(struct ntfsmount *ntmp, u_int32_t magic, void *xbufv,
size_t len)
{
char *xbuf = xbufv;
struct fixuphdr *fhp = (struct fixuphdr *) xbuf;
int i;
u_int16_t fixup;
u_int16_t *fxp, *cfxp;

if (fhp->fh_magic == 0)
return (EINVAL);
if (fhp->fh_magic != magic) {
printf("%s: magic doesn't match: %08x != %08x\n", __func__,
fhp->fh_magic, magic);
return (EINVAL);
}
if ((fhp->fh_fnum - 1) * ntmp->ntm_bps != len) {
printf("%s: bad fixups number: %d for %ld bytes block\n",
__func__, fhp->fh_fnum, (long)len); /* XXX printf kludge */
return (EINVAL);
}
if (fhp->fh_foff >= ntmp->ntm_spc * ntmp->ntm_mftrecsz * ntmp->ntm_bps) {
printf("%s: invalid offset: %x", __func__, fhp->fh_foff);
return (EINVAL);
}
fxp = (u_int16_t *) (xbuf + fhp->fh_foff);
cfxp = (u_int16_t *) (xbuf + ntmp->ntm_bps - 2);
fixup = *fxp++;
for (i = 1; i < fhp->fh_fnum; i++, fxp++) {
if (*cfxp != fixup) {
printf("%s: fixup %d doesn't match\n", __func__, i);
return (EINVAL);
}
*cfxp = *fxp;
cfxp = (u_int16_t *)((char *)cfxp + ntmp->ntm_bps);
}
return (0);
}

#if UNUSED_CODE
int
ntfs_runtocn(cn_t *cn, struct ntfsmount *ntmp, u_int8_t *run, u_long len,
cn_t vcn)
{
cn_t ccn = 0, ccl = 0;
u_long off = 0;
int error = 0;

#ifdef NTFS_DEBUG
int i;
printf("%s: run: %p, %ld bytes, vcn:%ld\n", __func__,
run, len, (u_long) vcn);
printf("%s: run: ", __func__);
for (i = 0; i < len; i++)
printf("0x%02x ", run[i]);
printf("\n");
#endif

if (NULL == run) {
printf("%s: run == NULL\n", __func__);
return (EINVAL);
}
do {
if (run[off] == 0) {
printf("%s: vcn too big\n", __func__);
return (E2BIG);
}
vcn -= ccl;
error = ntfs_parserun(&ccn, &ccl, run, len, &off);
if (error) {
printf("%s: ntfs_parserun failed\n", __func__);
return (error);
}
} while (ccl <= vcn);
*cn = ccn + vcn;
return (0);
}
#endif

/*
* this initializes toupper table & dependent variables to be ready for
* later work
*/
void
ntfs_toupper_init(void)
{
ntfs_toupper_tab = NULL;
mutex_init(&ntfs_toupper_lock, MUTEX_DEFAULT, IPL_NONE);
ntfs_toupper_usecount = 0;
}

/*
* if the ntfs_toupper_tab[] is filled already, just raise use count;
* otherwise read the data from the filesystem we are currently mounting
*/
int
ntfs_toupper_use(struct mount *mp, struct ntfsmount *ntmp)
{
int error = 0;
struct vnode *vp;

/* get exclusive access */
mutex_enter(&ntfs_toupper_lock);

/* only read the translation data from a file if it hasn't been
* read already */
if (ntfs_toupper_tab)
goto out;

/*
* Read in Unicode lowercase -> uppercase translation file.
* XXX for now, just the first 256 entries are used anyway,
* so don't bother reading more
*/
ntfs_toupper_tab = malloc(256 * 256 * sizeof(*ntfs_toupper_tab),
M_NTFSRDATA, M_WAITOK);

if ((error = VFS_VGET(mp, NTFS_UPCASEINO, LK_EXCLUSIVE, &vp)))
goto out;
error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
0, 256 * 256 * sizeof(*ntfs_toupper_tab), (char *)ntfs_toupper_tab,
NULL);
vput(vp);

out:
ntfs_toupper_usecount++;
mutex_exit(&ntfs_toupper_lock);
return (error);
}

/*
* lower the use count and if it reaches zero, free the memory
* tied by toupper table
*/
void
ntfs_toupper_unuse(void)
{
/* get exclusive access */
mutex_enter(&ntfs_toupper_lock);

ntfs_toupper_usecount--;
if (ntfs_toupper_usecount == 0) {
free(ntfs_toupper_tab, M_NTFSRDATA);
ntfs_toupper_tab = NULL;
}
#ifdef DIAGNOSTIC
else if (ntfs_toupper_usecount < 0) {
panic("ntfs_toupper_unuse(): use count negative: %d",
ntfs_toupper_usecount);
}
#endif

/* release the lock */
mutex_exit(&ntfs_toupper_lock);
}