/*      $NetBSD: ntfs_vnops.c,v 1.66 2021/06/29 22:34:07 dholland Exp $ */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * John Heidemann of the UCLA Ficus project.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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_vnops.c,v 1.5 1999/05/12 09:43:06 semenu Exp
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ntfs_vnops.c,v 1.66 2021/06/29 22:34:07 dholland Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/dirent.h>
#include <sys/kauth.h>
#include <sys/sysctl.h>


#include <fs/ntfs/ntfs.h>
#include <fs/ntfs/ntfs_inode.h>
#include <fs/ntfs/ntfs_subr.h>
#include <fs/ntfs/ntfs_vfsops.h>
#include <miscfs/specfs/specdev.h>
#include <miscfs/genfs/genfs.h>

#include <sys/unistd.h> /* for pathconf(2) constants */

static int      ntfs_bypass(void *);
static int      ntfs_read(void *);
static int      ntfs_write(void *);
static int      ntfs_getattr(void *);
static int      ntfs_inactive(void *);
static int      ntfs_print(void *);
static int      ntfs_reclaim(void *);
static int      ntfs_strategy(void *);
static int      ntfs_access(void *);
static int      ntfs_open(void *);
static int      ntfs_close(void *);
static int      ntfs_readdir(void *);
static int      ntfs_lookup(void *);
static int      ntfs_bmap(void *);
static int      ntfs_fsync(void *);
static int      ntfs_pathconf(void *);

/*
 * This is a noop, simply returning what one has been given.
 */
int
ntfs_bmap(void *v)
{
        struct vop_bmap_args /* {
                struct vnode *a_vp;
                daddr_t  a_bn;
                struct vnode **a_vpp;
                daddr_t *a_bnp;
                int *a_runp;
                int *a_runb;
        } */ *ap = v;
        dprintf(("ntfs_bmap: vn: %p, blk: %d\n", ap->a_vp,(u_int32_t)ap->a_bn));
        if (ap->a_vpp != NULL)
                *ap->a_vpp = ap->a_vp;
        if (ap->a_bnp != NULL)
                *ap->a_bnp = ap->a_bn;
        if (ap->a_runp != NULL)
                *ap->a_runp = 0;
        return (0);
}

static int
ntfs_read(void *v)
{
        struct vop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        struct uio *uio = ap->a_uio;
        struct ntfsmount *ntmp = ip->i_mp;
        u_int64_t toread;
        int error;

        dprintf(("ntfs_read: ino: %llu, off: %qd resid: %qd\n",
            (unsigned long long)ip->i_number, (long long)uio->uio_offset,
            (long long)uio->uio_resid));

        dprintf(("ntfs_read: filesize: %qu",(long long)fp->f_size));

        /* don't allow reading after end of file */
        if (uio->uio_offset > fp->f_size)
                toread = 0;
        else
                toread = MIN(uio->uio_resid, fp->f_size - uio->uio_offset );

        dprintf((", toread: %qu\n",(long long)toread));

        if (toread == 0)
                return (0);

        error = ntfs_readattr(ntmp, ip, fp->f_attrtype,
                fp->f_attrname, uio->uio_offset, toread, NULL, uio);
        if (error) {
                printf("ntfs_read: ntfs_readattr failed: %d\n",error);
                return (error);
        }

        return (0);
}

static int
ntfs_bypass(void *v)
{
        struct vop_generic_args /* {
                struct vnodeop_desc *a_desc;
                <other random data follows, presumably>
        } */ *ap __unused = v;
        int error = ENOTTY;
        dprintf(("ntfs_bypass: %s\n", ap->a_desc->vdesc_name));
        return (error);
}


static int
ntfs_getattr(void *v)
{
        struct vop_getattr_args /* {
                struct vnode *a_vp;
                struct vattr *a_vap;
                kauth_cred_t a_cred;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        struct vattr *vap = ap->a_vap;

        dprintf(("ntfs_getattr: %llu, flags: %d\n",
            (unsigned long long)ip->i_number, ip->i_flag));

        vap->va_fsid = ip->i_dev;
        vap->va_fileid = ip->i_number;
        vap->va_mode = ip->i_mp->ntm_mode;
        vap->va_nlink = ip->i_nlink;
        vap->va_uid = ip->i_mp->ntm_uid;
        vap->va_gid = ip->i_mp->ntm_gid;
        vap->va_rdev = 0;                               /* XXX UNODEV ? */
        vap->va_size = fp->f_size;
        vap->va_bytes = fp->f_allocated;
        vap->va_atime = ntfs_nttimetounix(fp->f_times.t_access);
        vap->va_mtime = ntfs_nttimetounix(fp->f_times.t_write);
        vap->va_ctime = ntfs_nttimetounix(fp->f_times.t_create);
        vap->va_flags = ip->i_flag;
        vap->va_gen = 0;
        vap->va_blocksize = ip->i_mp->ntm_spc * ip->i_mp->ntm_bps;
        vap->va_type = vp->v_type;
        vap->va_filerev = 0;
        return (0);
}


/*
 * Last reference to an ntnode.  If necessary, write or delete it.
 */
int
ntfs_inactive(void *v)
{
        struct vop_inactive_v2_args /* {
                struct vnode *a_vp;
                bool *a_recycle;
        } */ *ap = v;
        struct vnode *vp __unused = ap->a_vp;
#ifdef NTFS_DEBUG
        struct ntnode *ip = VTONT(vp);
#endif

        dprintf(("ntfs_inactive: vnode: %p, ntnode: %llu\n", vp,
            (unsigned long long)ip->i_number));

        /* XXX since we don't support any filesystem changes
         * right now, nothing more needs to be done
         */
        return (0);
}

/*
 * Reclaim an fnode/ntnode so that it can be used for other purposes.
 */
int
ntfs_reclaim(void *v)
{
        struct vop_reclaim_v2_args /* {
                struct vnode *a_vp;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        const int attrlen = strlen(fp->f_attrname);
        int error;

        VOP_UNLOCK(vp);

        dprintf(("ntfs_reclaim: vnode: %p, ntnode: %llu\n", vp,
            (unsigned long long)ip->i_number));

        if ((error = ntfs_ntget(ip)) != 0)
                return (error);

        if (ip->i_devvp) {
                vrele(ip->i_devvp);
                ip->i_devvp = NULL;
        }
        genfs_node_destroy(vp);
        vp->v_data = NULL;

        /* Destroy fnode. */
        if (fp->f_key != &fp->f_smallkey)
                kmem_free(fp->f_key, NTKEY_SIZE(attrlen));
        if (fp->f_dirblbuf)
                free(fp->f_dirblbuf, M_NTFSDIR);
        kmem_free(fp, sizeof(*fp));
        ntfs_ntrele(ip);

        ntfs_ntput(ip);

        return (0);
}

static int
ntfs_print(void *v)
{
        struct vop_print_args /* {
                struct vnode *a_vp;
        } */ *ap = v;
        struct ntnode *ip = VTONT(ap->a_vp);

        printf("tag VT_NTFS, ino %llu, flag %#x, usecount %d, nlink %ld\n",
            (unsigned long long)ip->i_number, ip->i_flag, ip->i_usecount,
            ip->i_nlink);
        printf("       ");
        printf("\n");
        return (0);
}

/*
 * Calculate the logical to physical mapping if not done already,
 * then call the device strategy routine.
 */
int
ntfs_strategy(void *v)
{
        struct vop_strategy_args /* {
                struct vnode *a_vp;
                struct buf *a_bp;
        } */ *ap = v;
        struct buf *bp = ap->a_bp;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        struct ntfsmount *ntmp = ip->i_mp;
        int error;

        dprintf(("ntfs_strategy: blkno: %d, lblkno: %d\n",
                (u_int32_t)bp->b_blkno,
                (u_int32_t)bp->b_lblkno));

        dprintf(("strategy: bcount: %u flags: 0x%x\n",
                (u_int32_t)bp->b_bcount,bp->b_flags));

        if (bp->b_flags & B_READ) {
                u_int32_t toread;

                if (ntfs_cntob(bp->b_blkno) >= fp->f_size) {
                        clrbuf(bp);
                        error = 0;
                } else {
                        toread = MIN(bp->b_bcount,
                                 fp->f_size - ntfs_cntob(bp->b_blkno));
                        dprintf(("ntfs_strategy: toread: %d, fsize: %d\n",
                                toread,(u_int32_t)fp->f_size));

                        error = ntfs_readattr(ntmp, ip, fp->f_attrtype,
                                fp->f_attrname, ntfs_cntob(bp->b_blkno),
                                toread, bp->b_data, NULL);

                        if (error) {
                                printf("ntfs_strategy: ntfs_readattr failed\n");
                                bp->b_error = error;
                        }

                        memset((char *)bp->b_data + toread, 0,
                            bp->b_bcount - toread);
                }
        } else {
                size_t tmp;
                u_int32_t towrite;

                if (ntfs_cntob(bp->b_blkno) + bp->b_bcount >= fp->f_size) {
                        printf("ntfs_strategy: CAN'T EXTEND FILE\n");
                        bp->b_error = error = EFBIG;
                } else {
                        towrite = MIN(bp->b_bcount,
                                fp->f_size - ntfs_cntob(bp->b_blkno));
                        dprintf(("ntfs_strategy: towrite: %d, fsize: %d\n",
                                towrite,(u_int32_t)fp->f_size));

                        error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,
                                fp->f_attrname, ntfs_cntob(bp->b_blkno),towrite,
                                bp->b_data, &tmp, NULL);

                        if (error) {
                                printf("ntfs_strategy: ntfs_writeattr fail\n");
                                bp->b_error = error;
                        }
                }
        }
        biodone(bp);
        return (error);
}

static int
ntfs_write(void *v)
{
        struct vop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        struct uio *uio = ap->a_uio;
        struct ntfsmount *ntmp = ip->i_mp;
        u_int64_t towrite;
        size_t written;
        int error;

        dprintf(("ntfs_write: ino: %llu, off: %qd resid: %qd\n",
            (unsigned long long)ip->i_number, (long long)uio->uio_offset,
            (long long)uio->uio_resid));
        dprintf(("ntfs_write: filesize: %qu",(long long)fp->f_size));

        if (uio->uio_resid + uio->uio_offset > fp->f_size) {
                printf("ntfs_write: CAN'T WRITE BEYOND END OF FILE\n");
                return (EFBIG);
        }

        towrite = MIN(uio->uio_resid, fp->f_size - uio->uio_offset);

        dprintf((", towrite: %qu\n",(long long)towrite));

        error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,
                fp->f_attrname, uio->uio_offset, towrite, NULL, &written, uio);
#ifdef NTFS_DEBUG
        if (error)
                printf("ntfs_write: ntfs_writeattr failed: %d\n", error);
#endif

        return (error);
}

static int
ntfs_check_possible(struct vnode *vp, struct ntnode *ip, accmode_t accmode)
{

        /*
         * Disallow write attempts on read-only file systems;
         * unless the file is a socket, fifo, or a block or
         * character device resident on the file system.
         */
        if (accmode & VWRITE) {
                switch ((int)vp->v_type) {
                case VDIR:
                case VLNK:
                case VREG:
                        if (vp->v_mount->mnt_flag & MNT_RDONLY)
                                return (EROFS);
                        break;
                }
        }

        return 0;
}

static int
ntfs_check_permitted(struct vnode *vp, struct ntnode *ip, accmode_t accmode,
    kauth_cred_t cred)
{
        mode_t file_mode;

        file_mode = ip->i_mp->ntm_mode | (S_IXUSR|S_IXGRP|S_IXOTH);

        return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode,
            vp->v_type, file_mode), vp, NULL, genfs_can_access(vp, cred,
            ip->i_mp->ntm_uid, ip->i_mp->ntm_gid, file_mode, NULL, accmode));
}

int
ntfs_access(void *v)
{
        struct vop_access_args /* {
                struct vnode *a_vp;
                accmode_t  a_accmode;
                kauth_cred_t a_cred;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct ntnode *ip = VTONT(vp);
        int error;

        dprintf(("ntfs_access: %llu\n", (unsigned long long)ip->i_number));

        error = ntfs_check_possible(vp, ip, ap->a_accmode);
        if (error)
                return error;

        error = ntfs_check_permitted(vp, ip, ap->a_accmode, ap->a_cred);

        return error;
}

/*
 * Open called.
 *
 * Nothing to do.
 */
/* ARGSUSED */
static int
ntfs_open(void *v)
{
        struct vop_open_args /* {
                struct vnode *a_vp;
                int  a_mode;
                kauth_cred_t a_cred;
        } */ *ap __unused = v;
#ifdef NTFS_DEBUG
        struct vnode *vp = ap->a_vp;
        struct ntnode *ip = VTONT(vp);

        dprintf(("ntfs_open: %llu\n", (unsigned long long)ip->i_number));
#endif

        /*
         * Files marked append-only must be opened for appending.
         */

        return (0);
}

/*
 * Close called.
 *
 * Update the times on the inode.
 */
/* ARGSUSED */
static int
ntfs_close(void *v)
{
        struct vop_close_args /* {
                struct vnode *a_vp;
                int  a_fflag;
                kauth_cred_t a_cred;
        } */ *ap __unused = v;
#ifdef NTFS_DEBUG
        struct vnode *vp = ap->a_vp;
        struct ntnode *ip = VTONT(vp);

        dprintf(("ntfs_close: %llu\n", (unsigned long long)ip->i_number));
#endif

        return (0);
}

int
ntfs_readdir(void *v)
{
        struct vop_readdir_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                kauth_cred_t a_cred;
                int *a_ncookies;
                u_int **cookies;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;
        struct fnode *fp = VTOF(vp);
        struct ntnode *ip = FTONT(fp);
        struct uio *uio = ap->a_uio;
        struct ntfsmount *ntmp = ip->i_mp;
        int i, error = 0;
        u_int32_t faked = 0, num;
        int ncookies = 0;
        struct dirent *cde;
        off_t off;

        dprintf(("ntfs_readdir %llu off: %qd resid: %qd\n",
            (unsigned long long)ip->i_number, (long long)uio->uio_offset,
            (long long)uio->uio_resid));

        off = uio->uio_offset;

        cde = malloc(sizeof(struct dirent), M_TEMP, M_WAITOK);

        /* Simulate . in every dir except ROOT */
        if (ip->i_number != NTFS_ROOTINO
            && uio->uio_offset < sizeof(struct dirent)) {
                cde->d_fileno = ip->i_number;
                cde->d_reclen = sizeof(struct dirent);
                cde->d_type = DT_DIR;
                cde->d_namlen = 1;
                strncpy(cde->d_name, ".", 2);
                error = uiomove((void *)cde, sizeof(struct dirent), uio);
                if (error)
                        goto out;

                ncookies++;
        }

        /* Simulate .. in every dir including ROOT */
        if (uio->uio_offset < 2 * sizeof(struct dirent)) {
                cde->d_fileno = NTFS_ROOTINO;   /* XXX */
                cde->d_reclen = sizeof(struct dirent);
                cde->d_type = DT_DIR;
                cde->d_namlen = 2;
                strncpy(cde->d_name, "..", 3);

                error = uiomove((void *) cde, sizeof(struct dirent), uio);
                if (error)
                        goto out;

                ncookies++;
        }

        faked = (ip->i_number == NTFS_ROOTINO) ? 1 : 2;
        num = uio->uio_offset / sizeof(struct dirent) - faked;

        while (uio->uio_resid >= sizeof(struct dirent)) {
                struct attr_indexentry *iep;
                char *fname;
                size_t remains;
                int sz;

                error = ntfs_ntreaddir(ntmp, fp, num, &iep);
                if (error)
                        goto out;

                if (NULL == iep)
                        break;

                for(; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (uio->uio_resid >= sizeof(struct dirent));
                        iep = NTFS_NEXTREC(iep, struct attr_indexentry *))
                {
                        if(!ntfs_isnamepermitted(ntmp,iep))
                                continue;

                        remains = sizeof(cde->d_name) - 1;
                        fname = cde->d_name;
                        for(i=0; i<iep->ie_fnamelen; i++) {
                                sz = (*ntmp->ntm_wput)(fname, remains,
                                                iep->ie_fname[i]);
                                fname += sz;
                                remains -= sz;
                        }
                        *fname = '\0';
                        dprintf(("ntfs_readdir: elem: %d, fname:[%s] type: %d, flag: %d, ",
                                num, cde->d_name, iep->ie_fnametype,
                                iep->ie_flag));
                        cde->d_namlen = fname - (char *) cde->d_name;
                        cde->d_fileno = iep->ie_number;
                        cde->d_type = (iep->ie_fflag & NTFS_FFLAG_DIR) ? DT_DIR : DT_REG;
                        cde->d_reclen = sizeof(struct dirent);
                        dprintf(("%s\n", (cde->d_type == DT_DIR) ? "dir":"reg"));

                        error = uiomove((void *)cde, sizeof(struct dirent), uio);
                        if (error)
                                goto out;

                        ncookies++;
                        num++;
                }
        }

        dprintf(("ntfs_readdir: %d entries (%d bytes) read\n",
                ncookies,(u_int)(uio->uio_offset - off)));
        dprintf(("ntfs_readdir: off: %qd resid: %qu\n",
                (long long)uio->uio_offset,(long long)uio->uio_resid));

        if (!error && ap->a_ncookies != NULL) {
                struct dirent* dpStart;
                struct dirent* dp;
                off_t *cookies;
                off_t *cookiep;

                dprintf(("ntfs_readdir: %d cookies\n",ncookies));
                dpStart = (struct dirent *)
                     ((char *)uio->uio_iov->iov_base -
                         (uio->uio_offset - off));
                cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
                for (dp = dpStart, cookiep = cookies, i=0;
                     i < ncookies;
                     dp = (struct dirent *)((char *) dp + dp->d_reclen), i++) {
                        off += dp->d_reclen;
                        *cookiep++ = (u_int) off;
                }
                *ap->a_ncookies = ncookies;
                *ap->a_cookies = cookies;
        }
/*
        if (ap->a_eofflag)
            *ap->a_eofflag = VTONT(ap->a_vp)->i_size <= uio->uio_offset;
*/
    out:
        free(cde, M_TEMP);
        return (error);
}

int
ntfs_lookup(void *v)
{
        struct vop_lookup_v2_args /* {
                struct vnode *a_dvp;
                struct vnode **a_vpp;
                struct componentname *a_cnp;
        } */ *ap = v;
        struct vnode *dvp = ap->a_dvp;
        struct ntnode *dip = VTONT(dvp);
        struct ntfsmount *ntmp = dip->i_mp;
        struct componentname *cnp = ap->a_cnp;
        kauth_cred_t cred = cnp->cn_cred;
        int error;

        dprintf(("ntfs_lookup: \"%.*s\" (%lld bytes) in %llu\n",
            (int)cnp->cn_namelen, cnp->cn_nameptr, (long long)cnp->cn_namelen,
            (unsigned long long)dip->i_number));

        error = VOP_ACCESS(dvp, VEXEC, cred);
        if(error)
                return (error);

        if ((cnp->cn_flags & ISLASTCN) &&
            (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
            (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
                return (EROFS);

        /*
         * We now have a segment name to search for, and a directory
         * to search.
         *
         * Before tediously performing a linear scan of the directory,
         * check the name cache to see if the directory/name pair
         * we are looking for is known already.
         */
        if (cache_lookup(ap->a_dvp, cnp->cn_nameptr, cnp->cn_namelen,
                         cnp->cn_nameiop, cnp->cn_flags, NULL, ap->a_vpp)) {
                return *ap->a_vpp == NULLVP ? ENOENT : 0;
        }

        if(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
                dprintf(("ntfs_lookup: faking . directory in %llu\n",
                    (unsigned long long)dip->i_number));

                vref(dvp);
                *ap->a_vpp = dvp;
                error = 0;
        } else if (cnp->cn_flags & ISDOTDOT) {
                struct ntvattr *vap;

                dprintf(("ntfs_lookup: faking .. directory in %llu\n",
                    (unsigned long long)dip->i_number));

                error = ntfs_ntvattrget(ntmp, dip, NTFS_A_NAME, NULL, 0, &vap);
                if (error) {
                        return (error);
                }

                dprintf(("ntfs_lookup: parentdir: %d\n",
                         vap->va_a_name->n_pnumber));
                error = ntfs_vgetex(ntmp->ntm_mountp,
                                 vap->va_a_name->n_pnumber,
                                 NTFS_A_DATA, "", 0, ap->a_vpp);
                ntfs_ntvattrrele(vap);
                if (error) {
                        return (error);
                }
        } else {
                error = ntfs_ntlookupfile(ntmp, dvp, cnp, ap->a_vpp);
                if (error) {
                        dprintf(("ntfs_ntlookupfile: returned %d\n", error));
                        return (error);
                }

                dprintf(("ntfs_lookup: found ino: %llu\n",
                    (unsigned long long)VTONT(*ap->a_vpp)->i_number));
        }

        cache_enter(dvp, *ap->a_vpp, cnp->cn_nameptr, cnp->cn_namelen,
                    cnp->cn_flags);

        return error;
}

/*
 * Flush the blocks of a file to disk.
 *
 * This function is worthless for vnodes that represent directories. Maybe we
 * could just do a sync if they try an fsync on a directory file.
 */
static int
ntfs_fsync(void *v)
{
        struct vop_fsync_args /* {
                struct vnode *a_vp;
                kauth_cred_t a_cred;
                int a_flags;
                off_t offlo;
                off_t offhi;
        } */ *ap = v;
        struct vnode *vp = ap->a_vp;

        if (ap->a_flags & FSYNC_CACHE) {
                return EOPNOTSUPP;
        }

        return vflushbuf(vp, ap->a_flags);
}

/*
 * Return POSIX pathconf information applicable to NTFS filesystem
 */
static int
ntfs_pathconf(void *v)
{
        struct vop_pathconf_args /* {
                struct vnode *a_vp;
                int a_name;
                register_t *a_retval;
        } */ *ap = v;

        switch (ap->a_name) {
        case _PC_LINK_MAX:
                *ap->a_retval = 1;
                return (0);
        case _PC_NAME_MAX:
                *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax;
                return (0);
        case _PC_PATH_MAX:
                *ap->a_retval = PATH_MAX;
                return (0);
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                return (0);
        case _PC_NO_TRUNC:
                *ap->a_retval = 0;
                return (0);
        case _PC_SYNC_IO:
                *ap->a_retval = 1;
                return (0);
        case _PC_FILESIZEBITS:
                *ap->a_retval = 64;
                return (0);
        default:
                return genfs_pathconf(ap);
        }
        /* NOTREACHED */
}

/*
 * Global vfs data structures
 */
vop_t **ntfs_vnodeop_p;

const struct vnodeopv_entry_desc ntfs_vnodeop_entries[] = {
        { &vop_default_desc, (vop_t *) ntfs_bypass },
        { &vop_parsepath_desc, genfs_parsepath },       /* parsepath */
        { &vop_lookup_desc, (vop_t *) ntfs_lookup },    /* lookup */
        { &vop_create_desc, genfs_eopnotsupp },         /* create */
        { &vop_mknod_desc, genfs_eopnotsupp },          /* mknod */
        { &vop_open_desc, (vop_t *) ntfs_open },        /* open */
        { &vop_close_desc,(vop_t *)  ntfs_close },      /* close */
        { &vop_access_desc, (vop_t *) ntfs_access },    /* access */
        { &vop_accessx_desc, (vop_t *) genfs_accessx }, /* accessx */
        { &vop_getattr_desc, (vop_t *) ntfs_getattr },  /* getattr */
        { &vop_setattr_desc, genfs_eopnotsupp },        /* setattr */
        { &vop_read_desc, (vop_t *) ntfs_read },        /* read */
        { &vop_write_desc, (vop_t *) ntfs_write },      /* write */
        { &vop_fallocate_desc, genfs_eopnotsupp },      /* fallocate */
        { &vop_fdiscard_desc, genfs_eopnotsupp },       /* fdiscard */
        { &vop_fcntl_desc, genfs_fcntl },               /* fcntl */
        { &vop_ioctl_desc, genfs_enoioctl },            /* ioctl */
        { &vop_poll_desc, genfs_poll },                 /* poll */
        { &vop_kqfilter_desc, genfs_kqfilter },         /* kqfilter */
        { &vop_revoke_desc, genfs_revoke },             /* revoke */
        { &vop_mmap_desc, genfs_mmap },                 /* mmap */
        { &vop_fsync_desc, (vop_t *) ntfs_fsync },      /* fsync */
        { &vop_seek_desc, genfs_seek },                 /* seek */
        { &vop_remove_desc, genfs_eopnotsupp },         /* remove */
        { &vop_link_desc, genfs_eopnotsupp },           /* link */
        { &vop_rename_desc, genfs_eopnotsupp },         /* rename */
        { &vop_mkdir_desc, genfs_eopnotsupp },          /* mkdir */
        { &vop_rmdir_desc, genfs_eopnotsupp },          /* rmdir */
        { &vop_symlink_desc, genfs_eopnotsupp },        /* symlink */
        { &vop_readdir_desc, (vop_t *) ntfs_readdir },  /* readdir */
        { &vop_readlink_desc, genfs_eopnotsupp },       /* readlink */
        { &vop_abortop_desc, genfs_abortop },           /* abortop */
        { &vop_inactive_desc, (vop_t *) ntfs_inactive },        /* inactive */
        { &vop_reclaim_desc, (vop_t *) ntfs_reclaim },  /* reclaim */
        { &vop_lock_desc, genfs_lock },                 /* lock */
        { &vop_unlock_desc, genfs_unlock },             /* unlock */
        { &vop_bmap_desc, (vop_t *) ntfs_bmap },        /* bmap */
        { &vop_strategy_desc, (vop_t *) ntfs_strategy },        /* strategy */
        { &vop_print_desc, (vop_t *) ntfs_print },      /* print */
        { &vop_islocked_desc, genfs_islocked },         /* islocked */
        { &vop_pathconf_desc, ntfs_pathconf },          /* pathconf */
        { &vop_advlock_desc, genfs_nullop },            /* advlock */
        { &vop_bwrite_desc, vn_bwrite },                /* bwrite */
        { &vop_getpages_desc, genfs_compat_getpages },  /* getpages */
        { &vop_putpages_desc, genfs_putpages },         /* putpages */
        { NULL, NULL }
};
const struct vnodeopv_desc ntfs_vnodeop_opv_desc =
        { &ntfs_vnodeop_p, ntfs_vnodeop_entries };