/*
 * Copyright (c) 2000-2001 Boris Popov
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Boris Popov.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * 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.
 *
 * $FreeBSD: src/sys/fs/smbfs/smbfs_vnops.c,v 1.2.2.8 2003/04/04 08:57:23 tjr Exp $
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/caps.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/mount.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/lockf.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_zone.h>


#include <netproto/smb/smb.h>
#include <netproto/smb/smb_conn.h>
#include <netproto/smb/smb_subr.h>

#include "smbfs.h"
#include "smbfs_node.h"
#include "smbfs_subr.h"

#include <sys/buf.h>

/*
 * Prototypes for SMBFS vnode operations
 */
static int smbfs_create(struct vop_old_create_args *);
static int smbfs_mknod(struct vop_old_mknod_args *);
static int smbfs_open(struct vop_open_args *);
static int smbfs_closel(struct vop_close_args *);
static int smbfs_access(struct vop_access_args *);
static int smbfs_getattr(struct vop_getattr_args *);
static int smbfs_setattr(struct vop_setattr_args *);
static int smbfs_read(struct vop_read_args *);
static int smbfs_write(struct vop_write_args *);
static int smbfs_fsync(struct vop_fsync_args *);
static int smbfs_remove(struct vop_old_remove_args *);
static int smbfs_link(struct vop_old_link_args *);
static int smbfs_lookup(struct vop_old_lookup_args *);
static int smbfs_rename(struct vop_old_rename_args *);
static int smbfs_mkdir(struct vop_old_mkdir_args *);
static int smbfs_rmdir(struct vop_old_rmdir_args *);
static int smbfs_symlink(struct vop_old_symlink_args *);
static int smbfs_readdir(struct vop_readdir_args *);
static int smbfs_bmap(struct vop_bmap_args *);
static int smbfs_strategy(struct vop_strategy_args *);
static int smbfs_print(struct vop_print_args *);
static int smbfs_pathconf(struct vop_pathconf_args *ap);
static int smbfs_advlock(struct vop_advlock_args *);
static int smbfs_getextattr(struct vop_getextattr_args *ap);

struct vop_ops smbfs_vnode_vops = {
        .vop_default =          vop_defaultop,
        .vop_access =           smbfs_access,
        .vop_advlock =          smbfs_advlock,
        .vop_bmap =             smbfs_bmap,
        .vop_close =            smbfs_closel,
        .vop_old_create =       smbfs_create,
        .vop_fsync =            smbfs_fsync,
        .vop_getattr =          smbfs_getattr,
        .vop_getpages =         smbfs_getpages,
        .vop_inactive =         smbfs_inactive,
        .vop_ioctl =            smbfs_ioctl,
        .vop_old_link =         smbfs_link,
        .vop_old_lookup =       smbfs_lookup,
        .vop_old_mkdir =        smbfs_mkdir,
        .vop_old_mknod =        smbfs_mknod,
        .vop_open =             smbfs_open,
        .vop_pathconf =         smbfs_pathconf,
        .vop_print =            smbfs_print,
        .vop_putpages =         smbfs_putpages,
        .vop_read =             smbfs_read,
        .vop_readdir =          smbfs_readdir,
        .vop_reclaim =          smbfs_reclaim,
        .vop_old_remove =       smbfs_remove,
        .vop_old_rename =       smbfs_rename,
        .vop_old_rmdir =        smbfs_rmdir,
        .vop_setattr =          smbfs_setattr,
        .vop_strategy =         smbfs_strategy,
        .vop_old_symlink =      smbfs_symlink,
        .vop_write =            smbfs_write,
        .vop_getextattr =       smbfs_getextattr
/*      .vop_setextattr =       smbfs_setextattr */
};

/*
 * smbfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
 */
static int
smbfs_access(struct vop_access_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbmount *smp = VTOSMBFS(vp);
        int mode;
        int error;

        SMBVDEBUG("\n");
        mode = ((vp->v_type == VREG) ? 
                    smp->sm_args.file_mode : smp->sm_args.dir_mode);
        error = vop_helper_access(ap, smp->sm_args.uid, smp->sm_args.gid,
                        mode, 0);
        return (error);
}

/*
 * smbfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
 *            struct file *a_fp)
 */
/* ARGSUSED */
static int
smbfs_open(struct vop_open_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);
        struct smb_cred scred;
        struct vattr vattr;
        int mode = ap->a_mode;
        int error, accmode;

        SMBVDEBUG("%s,%d\n", np->n_name, np->n_opencount);
        if (vp->v_type != VREG && vp->v_type != VDIR) { 
                SMBFSERR("open eacces vtype=%d\n", vp->v_type);
                return EACCES;
        }
        if (vp->v_type == VDIR) {
                if (np->n_opencount == 0)
                        np->n_cached_cred = crhold(ap->a_cred);
                np->n_opencount++;
                return (vop_stdopen(ap));
        }
        if (np->n_flag & NMODIFIED) {
                if ((error = smbfs_vinvalbuf(vp, V_SAVE, 1)) == EINTR)
                        return error;
                smbfs_attr_cacheremove(vp);
                error = VOP_GETATTR(vp, &vattr);
                if (error)
                        return error;
                np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
        } else {
                error = VOP_GETATTR(vp, &vattr);
                if (error)
                        return error;
                if (np->n_mtime.tv_sec != vattr.va_mtime.tv_sec) {
                        error = smbfs_vinvalbuf(vp, V_SAVE, 1);
                        if (error == EINTR)
                                return error;
                        np->n_mtime.tv_sec = vattr.va_mtime.tv_sec;
                }
        }
        if (np->n_opencount) {
                np->n_opencount++;
                return (vop_stdopen(ap));
        }
        accmode = SMB_AM_OPENREAD;
        if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
                accmode = SMB_AM_OPENRW;
        smb_makescred(&scred, curthread, ap->a_cred);
        error = smbfs_smb_open(np, accmode, &scred);
        if (error) {
                if (mode & FWRITE)
                        return EACCES;
                accmode = SMB_AM_OPENREAD;
                error = smbfs_smb_open(np, accmode, &scred);
        }
        if (!error) {
                np->n_cached_cred = crhold(ap->a_cred);
                np->n_opencount++;
        }
        smbfs_attr_cacheremove(vp);
        if (error == 0)
                vop_stdopen(ap);
        return error;
}

static int
smbfs_closel(struct vop_close_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);
        struct smb_cred scred;
        struct vattr vattr;
        int error;

        SMBVDEBUG("name=%s, pid=%d, c=%d\n",
                  np->n_name, p->p_pid, np->n_opencount);
        vn_lock(vp, LK_UPGRADE | LK_RETRY);

        smb_makescred(&scred, curthread, proc0.p_ucred);
        error = 0;

        if (np->n_opencount == 0) {
                if (vp->v_type != VDIR)
                        SMBERROR("Negative opencount\n");
                goto done;
        }
        np->n_opencount--;
        if (vp->v_type == VDIR) {
                if (np->n_opencount)
                        goto done;
                if (np->n_dirseq) {
                        smbfs_findclose(np->n_dirseq, &scred);
                        np->n_dirseq = NULL;
                }
        } else {
                error = smbfs_vinvalbuf(vp, V_SAVE, 1);
                if (np->n_opencount)
                        goto done;
                VOP_GETATTR(vp, &vattr);
                error = smbfs_smb_close(np->n_mount->sm_share, np->n_fid, 
                           &np->n_mtime, &scred);
        }
        crfree(np->n_cached_cred);
        np->n_cached_cred = NULL;
        smbfs_attr_cacheremove(vp);
done:
        vop_stdclose(ap);
        return error;
}

/*
 * smbfs_getattr call from vfs.
 *
 * smbfs_getattr(struct vnode *a_vp, struct vattr *a_vap)
 */
static int
smbfs_getattr(struct vop_getattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);
        struct vattr *va=ap->a_vap;
        struct smbfattr fattr;
        struct smb_cred scred;
        u_quad_t oldsize;
        int error;

        SMBVDEBUG("%lx: '%s' %d\n", (long)vp, np->n_name, (vp->v_flag & VROOT) != 0);
        error = smbfs_attr_cachelookup(vp, va);
        if (!error)
                return 0;
        SMBVDEBUG("not in the cache\n");
        smb_makescred(&scred, curthread, proc0.p_ucred);
        oldsize = np->n_size;
        error = smbfs_smb_lookup(np, NULL, 0, &fattr, &scred);
        if (error) {
                SMBVDEBUG("error %d\n", error);
                return error;
        }
        smbfs_attr_cacheenter(vp, &fattr);
        smbfs_attr_cachelookup(vp, va);
        if (np->n_opencount)
                np->n_size = oldsize;
        return 0;
}

/*
 * smbfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred)
 */
static int
smbfs_setattr(struct vop_setattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);
        struct vattr *vap = ap->a_vap;
        struct timespec *mtime, *atime;
        struct smb_cred scred;
        struct smb_share *ssp = np->n_mount->sm_share;
        struct smb_vc *vcp = SSTOVC(ssp);
        u_quad_t tsize = 0;
        int isreadonly, doclose, error = 0;

        SMBVDEBUG("\n");
        if (vap->va_flags != VNOVAL)
                return EOPNOTSUPP;
        isreadonly = (vp->v_mount->mnt_flag & MNT_RDONLY);
        /*
         * Disallow write attempts if the filesystem is mounted read-only.
         */
        if ((vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL || 
             vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL ||
             vap->va_mode != (mode_t)VNOVAL) && isreadonly)
                return EROFS;
        smb_makescred(&scred, curthread, ap->a_cred);
        if (vap->va_size != VNOVAL) {
                switch (vp->v_type) {
                    case VDIR:
                        return EISDIR;
                    case VREG:
                        break;
                    default:
                        return EINVAL;
                }
                if (isreadonly)
                        return EROFS;
                doclose = 0;
                vnode_pager_setsize(vp, (u_long)vap->va_size);
                tsize = np->n_size;
                np->n_size = vap->va_size;
                if (np->n_opencount == 0) {
                        error = smbfs_smb_open(np, SMB_AM_OPENRW, &scred);
                        if (error == 0)
                                doclose = 1;
                }
                if (error == 0)
                        error = smbfs_smb_setfsize(np, vap->va_size, &scred);
                if (doclose)
                        smbfs_smb_close(ssp, np->n_fid, NULL, &scred);
                if (error) {
                        np->n_size = tsize;
                        vnode_pager_setsize(vp, (u_long)tsize);
                        return error;
                }
        }
        mtime = atime = NULL;
        if (vap->va_mtime.tv_sec != VNOVAL)
                mtime = &vap->va_mtime;
        if (vap->va_atime.tv_sec != VNOVAL)
                atime = &vap->va_atime;
        if (mtime != atime) {
                if (ap->a_cred->cr_uid != VTOSMBFS(vp)->sm_args.uid &&
                    (error = caps_priv_check(ap->a_cred, SYSCAP_NOVFS_SETATTR)) &&
                    ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
                    (error = VOP_EACCESS(vp, VWRITE, ap->a_cred))))
                {
                        return (error);
                }
#if 0
                if (mtime == NULL)
                        mtime = &np->n_mtime;
                if (atime == NULL)
                        atime = &np->n_atime;
#endif
                /*
                 * If file is opened, then we can use handle based calls.
                 * If not, use path based ones.
                 */
                if (np->n_opencount == 0) {
                        if (vcp->vc_flags & SMBV_WIN95) {
                                error = VOP_OPEN(vp, FWRITE, ap->a_cred, NULL);
                                if (!error) {
/*                              error = smbfs_smb_setfattrNT(np, 0, mtime, atime, &scred);
                                VOP_GETATTR(vp, &vattr);*/
                                if (mtime)
                                        np->n_mtime = *mtime;
                                VOP_CLOSE(vp, FWRITE, NULL);
                                }
                        } else if ((vcp->vc_sopt.sv_caps & SMB_CAP_NT_SMBS)) {
                                error = smbfs_smb_setptime2(np, mtime, atime, 0, &scred);
/*                              error = smbfs_smb_setpattrNT(np, 0, mtime, atime, &scred);*/
                        } else if (SMB_DIALECT(vcp) >= SMB_DIALECT_LANMAN2_0) {
                                error = smbfs_smb_setptime2(np, mtime, atime, 0, &scred);
                        } else {
                                error = smbfs_smb_setpattr(np, 0, mtime, &scred);
                        }
                } else {
                        if (vcp->vc_sopt.sv_caps & SMB_CAP_NT_SMBS) {
                                error = smbfs_smb_setfattrNT(np, 0, mtime, atime, &scred);
                        } else if (SMB_DIALECT(vcp) >= SMB_DIALECT_LANMAN1_0) {
                                error = smbfs_smb_setftime(np, mtime, atime, &scred);
                        } else {
                                /*
                                 * I have no idea how to handle this for core
                                 * level servers. The possible solution is to
                                 * update mtime after file is closed.
                                 */
                                 SMBERROR("can't update times on an opened file\n");
                        }
                }
        }
        /*
         * Invalidate attribute cache in case if server doesn't set
         * required attributes.
         */
        smbfs_attr_cacheremove(vp);     /* invalidate cache */
        VOP_GETATTR(vp, vap);
        np->n_mtime.tv_sec = vap->va_mtime.tv_sec;
        return error;
}
/*
 * smbfs_read call.
 *
 * smbfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
 *            struct ucred *a_cred)
 */
static int
smbfs_read(struct vop_read_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;

        SMBVDEBUG("\n");
        if (vp->v_type != VREG && vp->v_type != VDIR)
                return EPERM;
        return smbfs_readvnode(vp, uio, ap->a_cred);
}

/*
 * smbfs_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
 *             struct ucred *a_cred)
 */
static int
smbfs_write(struct vop_write_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;

        SMBVDEBUG("%d,ofs=%d,sz=%d\n",vp->v_type, (int)uio->uio_offset, uio->uio_resid);
        if (vp->v_type != VREG)
                return (EPERM);
        return smbfs_writevnode(vp, uio, ap->a_cred,ap->a_ioflag);
}
/*
 * smbfs_create call
 * Create a regular file. On entry the directory to contain the file being
 * created is locked.  We must release before we return. 
 *
 * smbfs_create(struct vnode *a_dvp, struct vnode **a_vpp,
 *              struct componentname *a_cnp, struct vattr *a_vap)
 */
static int
smbfs_create(struct vop_old_create_args *ap)
{
        struct vnode *dvp = ap->a_dvp;
        struct vattr *vap = ap->a_vap;
        struct vnode **vpp=ap->a_vpp;
        struct componentname *cnp = ap->a_cnp;
        struct smbnode *dnp = VTOSMB(dvp);
        struct vnode *vp;
        struct vattr vattr;
        struct smbfattr fattr;
        struct smb_cred scred;
        char *name = cnp->cn_nameptr;
        int nmlen = cnp->cn_namelen;
        int error;
        

        SMBVDEBUG("\n");
        *vpp = NULL;
        if (vap->va_type != VREG)
                return EOPNOTSUPP;
        if ((error = VOP_GETATTR(dvp, &vattr)))
                return error;
        smb_makescred(&scred, cnp->cn_td, cnp->cn_cred);
        
        error = smbfs_smb_create(dnp, name, nmlen, &scred);
        if (error)
                return error;
        error = smbfs_smb_lookup(dnp, name, nmlen, &fattr, &scred);
        if (error)
                return error;
        error = smbfs_nget(VTOVFS(dvp), dvp, name, nmlen, &fattr, &vp);
        if (error)
                return error;
        *vpp = vp;
        return error;
}

/*
 * smbfs_remove(struct vnode *a_dvp, struct vnode *a_vp,
 *              struct componentname *a_cnp)
 */
static int
smbfs_remove(struct vop_old_remove_args *ap)
{
        struct vnode *vp = ap->a_vp;
/*      struct vnode *dvp = ap->a_dvp;*/
        struct componentname *cnp = ap->a_cnp;
        struct smbnode *np = VTOSMB(vp);
        struct smb_cred scred;
        int error;

        if (vp->v_type == VDIR || np->n_opencount || VREFCNT(vp) > 1)
                return EPERM;
        smb_makescred(&scred, cnp->cn_td, cnp->cn_cred);
        error = smbfs_smb_delete(np, &scred);
        return error;
}

/*
 * smbfs_file rename call
 *
 * smbfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
 *              struct componentname *a_fcnp, struct vnode *a_tdvp,
 *              struct vnode *a_tvp, struct componentname *a_tcnp)
 */
static int
smbfs_rename(struct vop_old_rename_args *ap)
{
        struct vnode *fvp = ap->a_fvp;
        struct vnode *tvp = ap->a_tvp;
        struct vnode *fdvp = ap->a_fdvp;
        struct vnode *tdvp = ap->a_tdvp;
        struct componentname *tcnp = ap->a_tcnp;
/*      struct componentname *fcnp = ap->a_fcnp;*/
        struct smb_cred scred;
        u_int16_t flags = 6;
        int error=0;

        /* Check for cross-device rename */
        if ((fvp->v_mount != tdvp->v_mount) ||
            (tvp && (fvp->v_mount != tvp->v_mount))) {
                error = EXDEV;
                goto out;
        }

        if (tvp && VREFCNT(tvp) > 1) {
                error = EBUSY;
                goto out;
        }
        flags = 0x10;                   /* verify all writes */
        if (fvp->v_type == VDIR) {
                flags |= 2;
        } else if (fvp->v_type == VREG) {
                flags |= 1;
        } else {
                error = EINVAL;
                goto out;
        }
        smb_makescred(&scred, tcnp->cn_td, tcnp->cn_cred);
        /*
         * It seems that Samba doesn't implement SMB_COM_MOVE call...
         */
#ifdef notnow
        if (SMB_DIALECT(SSTOCN(smp->sm_share)) >= SMB_DIALECT_LANMAN1_0) {
                error = smbfs_smb_move(VTOSMB(fvp), VTOSMB(tdvp),
                    tcnp->cn_nameptr, tcnp->cn_namelen, flags, &scred);
        } else
#endif
        {
                /*
                 * We have to do the work atomicaly
                 */
                if (tvp && tvp != fvp) {
                        error = smbfs_smb_delete(VTOSMB(tvp), &scred);
                        if (error)
                                goto out_cacherem;
                }
                error = smbfs_smb_rename(VTOSMB(fvp), VTOSMB(tdvp),
                                         tcnp->cn_nameptr, tcnp->cn_namelen,
                                         &scred);
                if (error == 0) {
                        smbfs_attr_cacherename(fvp,
                                               tcnp->cn_nameptr,
                                               tcnp->cn_namelen);
                }
        }

out_cacherem:
        smbfs_attr_cacheremove(fdvp);
        smbfs_attr_cacheremove(tdvp);
out:
        if (tdvp == tvp)
                vrele(tdvp);
        else
                vput(tdvp);
        if (tvp)
                vput(tvp);
        vrele(fdvp);
        vrele(fvp);
#ifdef possible_mistake
#error x
        vgone_vxlocked(fvp);
        if (tvp)
                vgone_vxlocked(tvp);
#endif
        return error;
}

/*
 * somtime it will come true...
 *
 * smbfs_link(struct vnode *a_tdvp, struct vnode *a_vp,
 *            struct componentname *a_cnp)
 */
static int
smbfs_link(struct vop_old_link_args *ap)
{
        return EOPNOTSUPP;
}

/*
 * smbfs_symlink link create call.
 * Sometime it will be functional...
 *
 * smbfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
 *               struct componentname *a_cnp, struct vattr *a_vap,
 *               char *a_target)
 */
static int
smbfs_symlink(struct vop_old_symlink_args *ap)
{
        return EOPNOTSUPP;
}

static int
smbfs_mknod(struct vop_old_mknod_args *ap)
{
        return EOPNOTSUPP;
}

/*
 * smbfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
 *              struct componentname *a_cnp, struct vattr *a_vap)
 */
static int
smbfs_mkdir(struct vop_old_mkdir_args *ap)
{
        struct vnode *dvp = ap->a_dvp;
/*      struct vattr *vap = ap->a_vap;*/
        struct vnode *vp;
        struct componentname *cnp = ap->a_cnp;
        struct smbnode *dnp = VTOSMB(dvp);
        struct vattr vattr;
        struct smb_cred scred;
        struct smbfattr fattr;
        char *name = cnp->cn_nameptr;
        int len = cnp->cn_namelen;
        int error;

        if ((error = VOP_GETATTR(dvp, &vattr))) {
                return error;
        }       
        if ((name[0] == '.') && ((len == 1) || ((len == 2) && (name[1] == '.'))))
                return EEXIST;
        smb_makescred(&scred, cnp->cn_td, cnp->cn_cred);
        error = smbfs_smb_mkdir(dnp, name, len, &scred);
        if (error)
                return error;
        error = smbfs_smb_lookup(dnp, name, len, &fattr, &scred);
        if (error)
                return error;
        error = smbfs_nget(VTOVFS(dvp), dvp, name, len, &fattr, &vp);
        if (error)
                return error;
        *ap->a_vpp = vp;
        return 0;
}

/*
 * smbfs_remove directory call
 *
 * smbfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
 *              struct componentname *a_cnp)
 */
static int
smbfs_rmdir(struct vop_old_rmdir_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
/*      struct smbmount *smp = VTOSMBFS(vp);*/
        struct smbnode *dnp = VTOSMB(dvp);
        struct smbnode *np = VTOSMB(vp);
        struct smb_cred scred;
        int error;

        if (dvp == vp)
                return EINVAL;

        smb_makescred(&scred, cnp->cn_td, cnp->cn_cred);
        error = smbfs_smb_rmdir(np, &scred);
        dnp->n_flag |= NMODIFIED;
        smbfs_attr_cacheremove(dvp);
        return error;
}

/*
 * smbfs_readdir call
 *
 * smbfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
 *               int *a_eofflag, off_t *a_cookies, int a_ncookies)
 */
static int
smbfs_readdir(struct vop_readdir_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;
        int error;

        if (vp->v_type != VDIR)
                return (EPERM);
#ifdef notnow
        if (ap->a_ncookies) {
                kprintf("smbfs_readdir: no support for cookies now...");
                return (EOPNOTSUPP);
        }
#endif
        error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM);
        if (error == 0) {
                error = smbfs_readvnode(vp, uio, ap->a_cred);
                vn_unlock(vp);
        }
        return error;
}

/*
 * smbfs_fsync(struct vnode *a_vp, int a_waitfor)
 */
/* ARGSUSED */
static int
smbfs_fsync(struct vop_fsync_args *ap)
{
/*      return (smb_flush(ap->a_vp, ap->a_waitfor, curthread, 1));*/
    return (0);
}

/*
 * smbfs_print(struct vnode *a_vp)
 */
static int
smbfs_print(struct vop_print_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);

        if (np == NULL) {
                kprintf("no smbnode data\n");
                return (0);
        }
        kprintf("tag VT_SMBFS, name = %s, parent = %p, opencount = %d",
            np->n_name, np->n_parent ? np->n_parent : NULL,
            np->n_opencount);
        lockmgr_printinfo(&vp->v_lock);
        kprintf("\n");
        return (0);
}

/*
 * smbfs_pathconf(struct vnode *vp, int name, register_t *retval)
 */
static int
smbfs_pathconf(struct vop_pathconf_args *ap)
{
        struct smbmount *smp = VFSTOSMBFS(VTOVFS(ap->a_vp));
        struct smb_vc *vcp = SSTOVC(smp->sm_share);
        register_t *retval = ap->a_retval;
        int error = 0;
        
        switch (ap->a_name) {
            case _PC_LINK_MAX:
                *retval = 0;
                break;
            case _PC_NAME_MAX:
                *retval = (vcp->vc_hflags2 & SMB_FLAGS2_KNOWS_LONG_NAMES) ? 255 : 12;
                break;
            case _PC_PATH_MAX:
                *retval = 800;  /* XXX: a correct one ? */
                break;
            default:
                error = EINVAL;
        }
        return error;
}

/*
 * smbfs_strategy(struct vnode *a_vp, struct bio *a_bio)
 */
static int
smbfs_strategy(struct vop_strategy_args *ap)
{
        struct bio *bio = ap->a_bio;
        struct thread *td = NULL;
        int error = 0;

        SMBVDEBUG("\n");
        if (bio->bio_flags & BIO_SYNC)
                td = curthread;         /* XXX */

        if (bio->bio_flags & BIO_SYNC)
                error = smbfs_doio(ap->a_vp, bio, proc0.p_ucred, td);
        return error;
}

/*
 * smbfs_bmap(struct vnode *a_vp, off_t a_loffset,
 *            off_t *a_doffsetp, int *a_runp, int *a_runb)
 */
static int
smbfs_bmap(struct vop_bmap_args *ap)
{
        if (ap->a_doffsetp != NULL)
                *ap->a_doffsetp = ap->a_loffset;
        if (ap->a_runp != NULL)
                *ap->a_runp = 0;
        if (ap->a_runb != NULL)
                *ap->a_runb = 0;
        return (0);
}

/*
 * smbfs_ioctl(struct vnode *a_vp, u_long a_command, caddr_t a_data,
 *              int fflag, struct ucred *cred, struct proc *p)
 */
int
smbfs_ioctl(struct vop_ioctl_args *ap)
{
        return EINVAL;
}

static char smbfs_atl[] = "rhsvda";

/*
 * smbfs_getextattr(struct vnode *a_vp, char *a_name, struct uio *a_uio,
 *              struct ucred *a_cred)
 */
static int
smbfs_getextattr(struct vop_getextattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct ucred *cred = ap->a_cred;
        struct uio *uio = ap->a_uio;
        const char *name = ap->a_attrname;
        struct smbnode *np = VTOSMB(vp);
        struct vattr vattr;
        char buf[10];
        int i, attr, error;

        error = VOP_EACCESS(vp, VREAD, cred);
        if (error)
                return error;
        error = VOP_GETATTR(vp, &vattr);
        if (error)
                return error;
        if (strcmp(name, "dosattr") == 0) {
                attr = np->n_dosattr;
                for (i = 0; i < 6; i++, attr >>= 1)
                        buf[i] = (attr & 1) ? smbfs_atl[i] : '-';
                buf[i] = 0;
                error = uiomove(buf, i, uio);
                
        } else
                error = EINVAL;
        return error;
}

/*
 * Since we expected to support F_GETLK (and SMB protocol has no such function),
 * it is necessary to use lf_advlock(). It would be nice if this function had
 * a callback mechanism because it will help to improve a level of consistency.
 *
 * smbfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
 *               struct flock *a_fl, int a_flags)
 */
int
smbfs_advlock(struct vop_advlock_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct smbnode *np = VTOSMB(vp);
        struct flock *fl = ap->a_fl;
        caddr_t id = (caddr_t)1 /* ap->a_id */;
/*      int flags = ap->a_flags;*/
        struct thread *td = curthread;          /* XXX */
        struct smb_cred scred;
        off_t start, end, size;
        int error, lkop;

        if (vp->v_type == VDIR) {
                /*
                 * SMB protocol have no support for directory locking.
                 * Although locks can be processed on local machine, I don't
                 * think that this is a good idea, because some programs
                 * can work wrong assuming directory is locked. So, we just
                 * return 'operation not supported
                 */
                 return EOPNOTSUPP;
        }
        size = np->n_size;
        switch (fl->l_whence) {
            case SEEK_SET:
            case SEEK_CUR:
                start = fl->l_start;
                break;
            case SEEK_END:
                start = fl->l_start + size;
            default:
                return EINVAL;
        }
        if (start < 0)
                return EINVAL;
        if (fl->l_len == 0)
                end = -1;
        else {
                end = start + fl->l_len - 1;
                if (end < start)
                        return EINVAL;
        }
        smb_makescred(&scred, td, td->td_proc ? td->td_proc->p_ucred : NULL);
        switch (ap->a_op) {
            case F_SETLK:
                switch (fl->l_type) {
                    case F_WRLCK:
                        lkop = SMB_LOCK_EXCL;
                        break;
                    case F_RDLCK:
                        lkop = SMB_LOCK_SHARED;
                        break;
                    case F_UNLCK:
                        lkop = SMB_LOCK_RELEASE;
                        break;
                    default:
                        return EINVAL;
                }
                error = lf_advlock(ap, &np->n_lockf, size);
                if (error)
                        break;
                lkop = SMB_LOCK_EXCL;
                error = smbfs_smb_lock(np, lkop, id, start, end, &scred);
                if (error) {
                        ap->a_op = F_UNLCK;
                        lf_advlock(ap, &np->n_lockf, size);
                }
                break;
            case F_UNLCK:
                lf_advlock(ap, &np->n_lockf, size);
                error = smbfs_smb_lock(np, SMB_LOCK_RELEASE, id, start, end, &scred);
                break;
            case F_GETLK:
                error = lf_advlock(ap, &np->n_lockf, size);
                break;
            default:
                return EINVAL;
        }
        return error;
}

static int
smbfs_pathcheck(struct smbmount *smp, const char *name, int nmlen, int nameiop)
{
        static const char *badchars = "*/:<>;?";
        static const char *badchars83 = " +|,";
        const char *cp;
        int i, error;

        /*
         * Backslash characters, being a path delimiter, are prohibited
         * within a path component even for LOOKUP operations.
         */
        if (index(name, '\\') != NULL)
                return ENOENT;

        if (nameiop == NAMEI_LOOKUP)
                return 0;
        error = ENOENT;
        if (SMB_DIALECT(SSTOVC(smp->sm_share)) < SMB_DIALECT_LANMAN2_0) {
                /*
                 * Name should conform 8.3 format
                 */
                if (nmlen > 12)
                        return ENAMETOOLONG;
                cp = index(name, '.');
                if (cp == NULL)
                        return error;
                if (cp == name || (cp - name) > 8)
                        return error;
                cp = index(cp + 1, '.');
                if (cp != NULL)
                        return error;
                for (cp = name, i = 0; i < nmlen; i++, cp++)
                        if (index(badchars83, *cp) != NULL)
                                return error;
        }
        for (cp = name, i = 0; i < nmlen; i++, cp++)
                if (index(badchars, *cp) != NULL)
                        return error;
        return 0;
}

/*
 * Things go even weird without fixed inode numbers...
 *
 * smbfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
 *              struct componentname *a_cnp)
 */
int
smbfs_lookup(struct vop_old_lookup_args *ap)
{
        struct componentname *cnp = ap->a_cnp;
        struct thread *td = cnp->cn_td;
        struct vnode *dvp = ap->a_dvp;
        struct vnode **vpp = ap->a_vpp;
        struct vnode *vp;
        struct smbmount *smp;
        struct mount *mp = dvp->v_mount;
        struct smbnode *dnp;
        struct smbfattr fattr, *fap;
        struct smb_cred scred;
        char *name = cnp->cn_nameptr;
        int flags = cnp->cn_flags;
        int nameiop = cnp->cn_nameiop;
        int nmlen = cnp->cn_namelen;
        int lockparent, wantparent, error, isdot;
        
        SMBVDEBUG("\n");
        cnp->cn_flags &= ~CNP_PDIRUNLOCK;
        *vpp = NULL;
        if (dvp->v_type != VDIR)
                return ENOTDIR;
        if ((flags & CNP_ISDOTDOT) && (dvp->v_flag & VROOT)) {
                SMBFSERR("invalid '..'\n");
                return EIO;
        }
#ifdef SMB_VNODE_DEBUG
        {
                char *cp, c;

                cp = name + nmlen;
                c = *cp;
                *cp = 0;
                SMBVDEBUG("%d '%s' in '%s' id=d\n", nameiop, name, 
                        VTOSMB(dvp)->n_name);
                *cp = c;
        }
#endif
        if ((mp->mnt_flag & MNT_RDONLY) && nameiop != NAMEI_LOOKUP)
                return EROFS;
        if ((error = VOP_EACCESS(dvp, VEXEC, cnp->cn_cred)) != 0)
                return error;
        lockparent = flags & CNP_LOCKPARENT;
        wantparent = flags & (CNP_LOCKPARENT | CNP_WANTPARENT);
        smp = VFSTOSMBFS(mp);
        dnp = VTOSMB(dvp);
        isdot = (nmlen == 1 && name[0] == '.');

        error = smbfs_pathcheck(smp, cnp->cn_nameptr, cnp->cn_namelen, nameiop);

        if (error) 
                return ENOENT;

        error = 0;
        smb_makescred(&scred, td, cnp->cn_cred);
        fap = &fattr;
        if (flags & CNP_ISDOTDOT) {
                error = smbfs_smb_lookup(VTOSMB(dnp->n_parent), NULL, 0, fap,
                    &scred);
                SMBVDEBUG("result of dotdot lookup: %d\n", error);
        } else {
                fap = &fattr;
                error = smbfs_smb_lookup(dnp, name, nmlen, fap, &scred);
/*              if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.')*/
                SMBVDEBUG("result of smbfs_smb_lookup: %d\n", error);
        }
        if (error && error != ENOENT)
                return error;
        if (error) {                    /* entry not found */
                /*
                 * Handle RENAME or CREATE case...
                 */
                if ((nameiop == NAMEI_CREATE || nameiop == NAMEI_RENAME) && wantparent) {
                        error = VOP_EACCESS(dvp, VWRITE, cnp->cn_cred);
                        if (error)
                                return error;
                        if (!lockparent) {
                                vn_unlock(dvp);
                                cnp->cn_flags |= CNP_PDIRUNLOCK;
                        }
                        return (EJUSTRETURN);
                }
                return ENOENT;
        }/* else {
                SMBVDEBUG("Found entry %s with id=%d\n", fap->entryName, fap->dirEntNum);
        }*/
        /*
         * handle DELETE case ...
         */
        if (nameiop == NAMEI_DELETE) {  /* delete last component */
                error = VOP_EACCESS(dvp, VWRITE, cnp->cn_cred);
                if (error)
                        return error;
                if (isdot) {
                        vref(dvp);
                        *vpp = dvp;
                        return 0;
                }
                error = smbfs_nget(mp, dvp, name, nmlen, fap, &vp);
                if (error)
                        return error;
                *vpp = vp;
                if (!lockparent) {
                        vn_unlock(dvp);
                        cnp->cn_flags |= CNP_PDIRUNLOCK;
                }
                return 0;
        }
        if (nameiop == NAMEI_RENAME && wantparent) {
                error = VOP_EACCESS(dvp, VWRITE, cnp->cn_cred);
                if (error)
                        return error;
                if (isdot)
                        return EISDIR;
                error = smbfs_nget(mp, dvp, name, nmlen, fap, &vp);
                if (error)
                        return error;
                *vpp = vp;
                if (!lockparent) {
                        vn_unlock(dvp);
                        cnp->cn_flags |= CNP_PDIRUNLOCK;
                }
                return 0;
        }
        if (flags & CNP_ISDOTDOT) {
                vn_unlock(dvp);
                error = smbfs_nget(mp, dvp, name, nmlen, NULL, &vp);
                if (error) {
                        vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
                        return error;
                }
                if (lockparent) {
                        error = vn_lock(dvp, LK_EXCLUSIVE | LK_FAILRECLAIM);
                        if (error) {
                                cnp->cn_flags |= CNP_PDIRUNLOCK;
                                vput(vp);
                                return error;
                        }
                }
                *vpp = vp;
        } else if (isdot) {
                vref(dvp);
                *vpp = dvp;
        } else {
                error = smbfs_nget(mp, dvp, name, nmlen, fap, &vp);
                if (error)
                        return error;
                *vpp = vp;
                SMBVDEBUG("lookup: getnewvp!\n");
                if (!lockparent) {
                        vn_unlock(dvp);
                        cnp->cn_flags |= CNP_PDIRUNLOCK;
                }
        }
        return 0;
}