fs/smbsrv/smb_vops.c

	smb_vops.c revision 62ab33e74bc127994db89903ba3f8fe82b68eec7
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/statvfs.h>
#include <sys/vnode.h>
#include <sys/thread.h>
#include <sys/pathname.h>
#include <sys/cred.h>
#include <sys/extdirent.h>
#include <sys/nbmlock.h>
#include <sys/share.h>
#include <sys/fcntl.h>

#include <smbsrv/smb_vops.h>
#include <smbsrv/string.h>

#include <smbsrv/smbtrans.h>
#include <smbsrv/smb_fsops.h>
#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_incl.h>

void
smb_vop_setup_xvattr(smb_attr_t *smb_attr, xvattr_t *xvattr);

static int
smb_vop_readdir_readpage(vnode_t *vp, void *buf, uint32_t offset, int *count,
    cred_t *cr, int flags);

static int
smb_vop_readdir_entry(vnode_t *dvp, uint32_t *cookiep, char *name, int *namelen,
    ino64_t *inop, vnode_t **vpp, char *od_name, int flags, cred_t *cr,
    char *dirbuf, int num_bytes);

static int
smb_vop_getdents_entries(smb_node_t *dir_snode, uint32_t *cookiep,
    int32_t *dircountp, char *arg, uint32_t flags, struct smb_request *sr,
    cred_t *cr, char *dirbuf, int *maxentries, int num_bytes, char *);

extern int
smb_gather_dents_info(char *args, ino_t fileid, int namelen,
    char *name, uint32_t cookie, int32_t *countp,
    smb_attr_t *attr, struct smb_node *snode,
    char *shortname, char *name83);

static void
smb_sa_to_va_mask(uint_t sa_mask, uint_t *va_maskp);

extern sysid_t lm_alloc_sysidt();

#define SMB_AT_MAX  16
static uint_t smb_attrmap[SMB_AT_MAX] = {
    0,
    AT_TYPE,
    AT_MODE,
    AT_UID,
    AT_GID,
    AT_FSID,
    AT_NODEID,
    AT_NLINK,
    AT_SIZE,
    AT_ATIME,
    AT_MTIME,
    AT_CTIME,
    AT_RDEV,
    AT_BLKSIZE,
    AT_NBLOCKS,
    AT_SEQ
};

/*
 * The smb_ct will be used primarily for range locking.
 * Since the CIFS server is mapping its locks to POSIX locks,
 * only one pid is used for operations originating from the
 * CIFS server (to represent CIFS in the VOP_FRLOCK routines).
 */

caller_context_t smb_ct;

/*
 * smb_vop_start()
 *
 * Initialize the smb caller context.  This function must be called
 * before any other smb_vop calls.
 */

void
smb_vop_start(void)
{
    static boolean_t initialized = B_FALSE;

    if (!initialized) {
        smb_ct.cc_caller_id = fs_new_caller_id();
        smb_ct.cc_pid = ttoproc(curthread)->p_pid;
        smb_ct.cc_sysid = lm_alloc_sysidt();
        initialized = B_TRUE;
    }
}

int
smb_vop_open(vnode_t **vpp, int mode, cred_t *cred)
{
    return (VOP_OPEN(vpp, mode, cred, &smb_ct));
}

int
smb_vop_close(vnode_t *vp, int mode, cred_t *cred)
{
    return (VOP_CLOSE(vp, mode, 1, (offset_t)0, cred, &smb_ct));
}

/*
 * The smb_vop_* functions have minimal knowledge of CIFS semantics and
 * serve as an interface to the VFS layer.
 *
 * Only smb_fsop_* layer functions should call smb_vop_* layer functions.
 * (Higher-level CIFS service code should never skip the smb_fsop_* layer
 * to call smb_vop_* layer functions directly.)
 */

/*
 * XXX - Extended attributes support in the file system assumed.
 * This is needed for full NT Streams functionality.
 */

int
smb_vop_read(vnode_t *vp, uio_t *uiop, cred_t *cr)
{
    int error;

    (void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
    error = VOP_READ(vp, uiop, 0, cr, &smb_ct);
    VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);
    return (error);
}

int
smb_vop_write(vnode_t *vp, uio_t *uiop, uint32_t *flag, uint32_t *lcount,
    cred_t *cr)
{
    int error;
    int ioflag = 0;

    *lcount = uiop->uio_resid;

    if (*flag == FSSTAB_FILE_SYNC)
        ioflag = FSYNC;

    uiop->uio_llimit = MAXOFFSET_T;

    (void) VOP_RWLOCK(vp, V_WRITELOCK_TRUE, NULL);
    error = VOP_WRITE(vp, uiop, ioflag, cr, &smb_ct);
    VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);

    *lcount -= uiop->uio_resid;

    return (error);
}

/*
 * smb_vop_getattr()
 *
 * smb_fsop_getattr()/smb_vop_getattr() should always be called from the CIFS
 * service (instead of calling VOP_GETATTR directly) to retrieve attributes
 * due to special processing needed for streams files.
 *
 * All attributes are retrieved.
 *
 * A named stream's attributes (as far as CIFS is concerned) are those of the
 * unnamed (i.e. data) stream (minus the size attribute), and the size of the
 * named stream.  Though the file system may store attributes other than size
 * with the named stream, these should not be used by CIFS for any purpose.
 *
 * When vp denotes a named stream, then unnamed_vp should be passed in (denoting
 * the corresponding unnamed stream).
 */

int
smb_vop_getattr(vnode_t *vp, vnode_t *unnamed_vp, smb_attr_t *ret_attr,
    int flags, cred_t *cr)
{
    int error;
    vnode_t *use_vp;
    smb_attr_t tmp_attr;
    xvattr_t tmp_xvattr;
    xoptattr_t *xoap = NULL;

    if (unnamed_vp)
        use_vp = unnamed_vp;
    else
        use_vp = vp;

    if (vfs_has_feature(use_vp->v_vfsp, VFSFT_XVATTR)) {
        xva_init(&tmp_xvattr);
        xoap = xva_getxoptattr(&tmp_xvattr);

        ASSERT(xoap);

        smb_sa_to_va_mask(ret_attr->sa_mask,
            &tmp_xvattr.xva_vattr.va_mask);

        XVA_SET_REQ(&tmp_xvattr, XAT_READONLY);
        XVA_SET_REQ(&tmp_xvattr, XAT_HIDDEN);
        XVA_SET_REQ(&tmp_xvattr, XAT_SYSTEM);
        XVA_SET_REQ(&tmp_xvattr, XAT_ARCHIVE);
        XVA_SET_REQ(&tmp_xvattr, XAT_CREATETIME);

        if ((error = VOP_GETATTR(use_vp, (vattr_t *)&tmp_xvattr, flags,
            cr, &smb_ct)) != 0)
            return (error);

        ret_attr->sa_vattr = tmp_xvattr.xva_vattr;

        /*
         * Copy special attributes to ret_attr parameter
         */

        ret_attr->sa_dosattr = 0;

        ASSERT(tmp_xvattr.xva_vattr.va_mask & AT_XVATTR);

        xoap = xva_getxoptattr(&tmp_xvattr);
        ASSERT(xoap);

        if (XVA_ISSET_RTN(&tmp_xvattr, XAT_READONLY)) {
            if (xoap->xoa_readonly)
                ret_attr->sa_dosattr |= FILE_ATTRIBUTE_READONLY;
        }

        if (XVA_ISSET_RTN(&tmp_xvattr, XAT_HIDDEN)) {
            if (xoap->xoa_hidden)
                ret_attr->sa_dosattr |= FILE_ATTRIBUTE_HIDDEN;
        }

        if (XVA_ISSET_RTN(&tmp_xvattr, XAT_SYSTEM)) {
            if (xoap->xoa_system)
                ret_attr->sa_dosattr |= FILE_ATTRIBUTE_SYSTEM;
        }

        if (XVA_ISSET_RTN(&tmp_xvattr, XAT_ARCHIVE)) {
            if (xoap->xoa_archive)
                ret_attr->sa_dosattr |= FILE_ATTRIBUTE_ARCHIVE;
        }

        ret_attr->sa_crtime = xoap->xoa_createtime;

        if (unnamed_vp && (ret_attr->sa_mask & SMB_AT_SIZE)) {
            /*
             * Retrieve stream size attribute into temporary
             * structure, in case the underlying file system
             * returns attributes other than the size (we do not
             * want to have ret_attr's other fields get
             * overwritten).
             *
             * Note that vp is used here, and not use_vp.
             * Also, only AT_SIZE is needed.
             */

            tmp_xvattr.xva_vattr.va_mask = AT_SIZE;

            if ((error = VOP_GETATTR(vp, (vattr_t *)&tmp_xvattr,
                flags, cr, &smb_ct)) != 0)
                return (error);

            ret_attr->sa_vattr.va_size =
                tmp_xvattr.xva_vattr.va_size;

        }

        if (ret_attr->sa_vattr.va_type == VDIR) {
            ret_attr->sa_dosattr |= FILE_ATTRIBUTE_DIRECTORY;
        }

        return (error);
    }

    /*
     * Support for file systems without VFSFT_XVATTR
     */

    smb_sa_to_va_mask(ret_attr->sa_mask,
        &ret_attr->sa_vattr.va_mask);

    error = VOP_GETATTR(use_vp, &ret_attr->sa_vattr, flags, cr, &smb_ct);

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

    /*
     * "Fake" DOS attributes and create time, filesystem doesn't support
     * them.
     */

    ret_attr->sa_dosattr = 0;
    ret_attr->sa_crtime = ret_attr->sa_vattr.va_ctime;

    if (unnamed_vp && (ret_attr->sa_mask & SMB_AT_SIZE)) {
        /*
         * Retrieve stream size attribute into temporary structure,
         * in case the underlying file system returns attributes
         * other than the size (we do not want to have ret_attr's
         * other fields get overwritten).
         *
         * Note that vp is used here, and not use_vp.
         * Also, only AT_SIZE is needed.
         */

        tmp_attr.sa_vattr.va_mask = AT_SIZE;
        error = VOP_GETATTR(vp, &tmp_attr.sa_vattr, flags, cr, &smb_ct);

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


        ret_attr->sa_vattr.va_size = tmp_attr.sa_vattr.va_size;
    }

    if (ret_attr->sa_vattr.va_type == VDIR) {
        ret_attr->sa_dosattr |= FILE_ATTRIBUTE_DIRECTORY;
    }

    return (error);
}

/*
 * smb_vop_setattr()
 *
 * smb_fsop_setattr()/smb_vop_setattr() should always be called from the CIFS
 * service to set attributes due to special processing for streams files.
 *
 * When smb_vop_setattr() is called on a named stream file, all indicated
 * attributes except the size are set on the unnamed stream file.  The size
 * (if indicated) is set on the named stream file.
 */

int
smb_vop_setattr(vnode_t *vp, vnode_t *unnamed_vp, smb_attr_t *set_attr,
    int flags, cred_t *cr, boolean_t no_xvattr)
{
    int error = 0;
    int at_size = 0;
    vnode_t *use_vp;
    xvattr_t xvattr;
    vattr_t *vap;

    if (unnamed_vp) {
        use_vp = unnamed_vp;
        if (set_attr->sa_mask & SMB_AT_SIZE) {
            at_size = 1;
            set_attr->sa_mask &= ~SMB_AT_SIZE;
        }
    } else {
        use_vp = vp;
    }

    /*
     * The caller should not be setting sa_vattr.va_mask,
     * but rather sa_mask.
     */

    set_attr->sa_vattr.va_mask = 0;

    if ((no_xvattr == B_FALSE) &&
        vfs_has_feature(use_vp->v_vfsp, VFSFT_XVATTR)) {

        smb_vop_setup_xvattr(set_attr, &xvattr);
        vap = (vattr_t *)&xvattr;
    } else {
        smb_sa_to_va_mask(set_attr->sa_mask,
            &set_attr->sa_vattr.va_mask);
        vap = &set_attr->sa_vattr;
    }

    if ((error = VOP_SETATTR(use_vp, vap, flags, cr, &smb_ct)) != 0)
        return (error);

    /*
     * If the size of the stream needs to be set, set it on
     * the stream file directly.  (All other indicated attributes
     * are set on the stream's unnamed stream, above.)
     */

    if (at_size) {
        /*
         * set_attr->sa_vattr.va_size already contains the
         * size as set by the caller
         *
         * Note that vp is used here, and not use_vp.
         * Also, only AT_SIZE is needed.
         */

        set_attr->sa_vattr.va_mask = AT_SIZE;
        error = VOP_SETATTR(vp, &set_attr->sa_vattr, flags, cr,
            &smb_ct);
    }

    return (error);
}

/*
 * smb_vop_access
 *
 * This is a wrapper round VOP_ACCESS. VOP_ACCESS checks the given mode
 * against file's ACL or Unix permissions. CIFS on the other hand needs to
 * know if the requested operation can succeed for the given object, this
 * requires more checks in case of DELETE bit since permissions on the parent
 * directory are important as well. Based on Windows rules if parent's ACL
 * grant FILE_DELETE_CHILD a file can be delete regardless of the file's
 * permissions.
 */
int
smb_vop_access(vnode_t *vp, int mode, int flags, vnode_t *dir_vp, cred_t *cr)
{
    int error = 0;

    if (mode == 0)
        return (0);

    if ((flags == V_ACE_MASK) && (mode & ACE_DELETE)) {
        if (dir_vp) {
            error = VOP_ACCESS(dir_vp, ACE_DELETE_CHILD, flags,
                cr, NULL);

            if (error == 0)
                mode &= ~ACE_DELETE;
        }
    }

    if (mode) {
        error = VOP_ACCESS(vp, mode, flags, cr, NULL);
    }

    return (error);
}

/*
 * smb_vop_lookup
 *
 * dvp:     directory vnode (in)
 * name:    name of file to be looked up (in)
 * vpp:     looked-up vnode (out)
 * od_name: on-disk name of file (out).
 *      This parameter is optional.  If a pointer is passed in, it
 *      must be allocated with MAXNAMELEN bytes
 * rootvp:  vnode of the tree root (in)
 *      This parameter is always passed in non-NULL except at the time
 *      of share set up.
 */

int
smb_vop_lookup(vnode_t *dvp, char *name, vnode_t **vpp, char *od_name,
    int flags, vnode_t *rootvp, cred_t *cr)
{
    int error = 0;
    int option_flags = 0;
    pathname_t rpn;

    if (*name == '\0')
        return (EINVAL);

    ASSERT(vpp);
    *vpp = NULL;

    if ((name[0] == '.') && (name[1] == '.') && (name[2] == 0)) {
        if (rootvp && (dvp == rootvp)) {
            VN_HOLD(dvp);
            *vpp = dvp;
            return (0);
        }

        if (dvp->v_flag & VROOT) {
            vfs_t *vfsp;
            vnode_t *cvp = dvp;

            /*
             * Set dvp and check for races with forced unmount
             * (see lookuppnvp())
             */

            vfsp = cvp->v_vfsp;
            vfs_rlock_wait(vfsp);
            if (((dvp = cvp->v_vfsp->vfs_vnodecovered) == NULL) ||
                (cvp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) {
                vfs_unlock(vfsp);
                return (EIO);
            }
            vfs_unlock(vfsp);
        }
    }


    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    pn_alloc(&rpn);

    error = VOP_LOOKUP(dvp, name, vpp, NULL, option_flags, NULL, cr,
        &smb_ct, NULL, &rpn);

    if ((error == 0) && od_name) {
        bzero(od_name, MAXNAMELEN);
        if (option_flags == FIGNORECASE)
            (void) strlcpy(od_name, rpn.pn_buf, MAXNAMELEN);
        else
            (void) strlcpy(od_name, name, MAXNAMELEN);
    }

    pn_free(&rpn);
    return (error);
}

int
smb_vop_create(vnode_t *dvp, char *name, smb_attr_t *attr, vnode_t **vpp,
    int flags, cred_t *cr, vsecattr_t *vsap)
{
    int error;
    int option_flags = 0;
    xvattr_t xvattr;
    vattr_t *vap;

    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    attr->sa_vattr.va_mask = 0;

    if (vfs_has_feature(dvp->v_vfsp, VFSFT_XVATTR)) {
        smb_vop_setup_xvattr(attr, &xvattr);
        vap = (vattr_t *)&xvattr;
    } else {
        smb_sa_to_va_mask(attr->sa_mask, &attr->sa_vattr.va_mask);
        vap = &attr->sa_vattr;
    }

    error = VOP_CREATE(dvp, name, vap, EXCL, attr->sa_vattr.va_mode,
        vpp, cr, option_flags, &smb_ct, vsap);

    return (error);
}

int
smb_vop_remove(vnode_t *dvp, char *name, int flags, cred_t *cr)
{
    int error;
    int option_flags = 0;

    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    error = VOP_REMOVE(dvp, name, cr, &smb_ct, option_flags);

    return (error);
}

/*
 * smb_vop_rename()
 *
 * The rename is for files in the same tree (identical TID) only.
 */

int
smb_vop_rename(vnode_t *from_dvp, char *from_name, vnode_t *to_dvp,
    char *to_name, int flags, cred_t *cr)
{
    int error;
    int option_flags = 0;


    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    error = VOP_RENAME(from_dvp, from_name, to_dvp, to_name, cr,
        &smb_ct, option_flags);

    return (error);
}

int
smb_vop_mkdir(vnode_t *dvp, char *name, smb_attr_t *attr, vnode_t **vpp,
    int flags, cred_t *cr, vsecattr_t *vsap)
{
    int error;
    int option_flags = 0;


    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    smb_sa_to_va_mask(attr->sa_mask, &attr->sa_vattr.va_mask);

    error = VOP_MKDIR(dvp, name, &attr->sa_vattr, vpp, cr, &smb_ct,
        option_flags, vsap);

    return (error);
}

/*
 * smb_vop_rmdir()
 *
 * Only simple rmdir supported, consistent with NT semantics
 * (can only remove an empty directory).
 *
 */

int
smb_vop_rmdir(vnode_t *dvp, char *name, int flags, cred_t *cr)
{
    int error;
    int option_flags = 0;

    if (flags & SMB_IGNORE_CASE)
        option_flags = FIGNORECASE;

    /*
     * Comments adapted from rfs_rmdir().
     *
     * VOP_RMDIR now takes a new third argument (the current
     * directory of the process).  That's because rmdir
     * wants to return EINVAL if one tries to remove ".".
     * Of course, SMB servers do not know what their
     * clients' current directories are.  We fake it by
     * supplying a vnode known to exist and illegal to
     * remove.
     */

    error = VOP_RMDIR(dvp, name, rootdir, cr, &smb_ct, option_flags);
    return (error);
}

int
smb_vop_commit(vnode_t *vp, cred_t *cr)
{
    return (VOP_FSYNC(vp, 1, cr, &smb_ct));
}

void
smb_vop_setup_xvattr(smb_attr_t *smb_attr, xvattr_t *xvattr)
{
    xoptattr_t *xoap = NULL;
    uint_t xva_mask;

    /*
     * Initialize xvattr, including bzero
     */
    xva_init(xvattr);
    xoap = xva_getxoptattr(xvattr);

    ASSERT(xoap);

    /*
     * Copy caller-specified classic attributes to xvattr.
     * First save xvattr's mask (set in xva_init()), which
     * contains AT_XVATTR.  This is |'d in later if needed.
     */

    xva_mask = xvattr->xva_vattr.va_mask;
    xvattr->xva_vattr = smb_attr->sa_vattr;

    smb_sa_to_va_mask(smb_attr->sa_mask, &xvattr->xva_vattr.va_mask);

    /*
     * Do not set ctime (only the file system can do it)
     */

    xvattr->xva_vattr.va_mask &= ~AT_CTIME;

    if (smb_attr->sa_mask & SMB_AT_DOSATTR) {

        /*
         * "|" in the original xva_mask, which contains
         * AT_XVATTR
         */

        xvattr->xva_vattr.va_mask |= xva_mask;

        XVA_SET_REQ(xvattr, XAT_ARCHIVE);
        XVA_SET_REQ(xvattr, XAT_SYSTEM);
        XVA_SET_REQ(xvattr, XAT_READONLY);
        XVA_SET_REQ(xvattr, XAT_HIDDEN);

        /*
         * smb_attr->sa_dosattr: If a given bit is not set,
         * that indicates that the corresponding field needs
         * to be updated with a "0" value.  This is done
         * implicitly as the xoap->xoa_* fields were bzero'd.
         */

        if (smb_attr->sa_dosattr & FILE_ATTRIBUTE_ARCHIVE)
            xoap->xoa_archive = 1;

        if (smb_attr->sa_dosattr & FILE_ATTRIBUTE_SYSTEM)
            xoap->xoa_system = 1;

        if (smb_attr->sa_dosattr & FILE_ATTRIBUTE_READONLY)
            xoap->xoa_readonly = 1;

        if (smb_attr->sa_dosattr & FILE_ATTRIBUTE_HIDDEN)
            xoap->xoa_hidden = 1;
    }

    if (smb_attr->sa_mask & SMB_AT_CRTIME) {
        /*
         * "|" in the original xva_mask, which contains
         * AT_XVATTR
         */

        xvattr->xva_vattr.va_mask |= xva_mask;
        XVA_SET_REQ(xvattr, XAT_CREATETIME);
        xoap->xoa_createtime = smb_attr->sa_crtime;
    }
}


/*
 * smb_vop_readdir()
 *
 * Upon return, the "name" field will contain either the on-disk name or, if
 * it needs mangling or has a case-insensitive collision, the mangled
 * "shortname."
 *
 * vpp is an optional parameter.  If non-NULL, it will contain a pointer to
 * the vnode for the name that is looked up (the vnode will be returned held).
 *
 * od_name is an optional parameter (NULL can be passed if the on-disk name
 * is not needed by the caller).
 */

int
smb_vop_readdir(vnode_t *dvp, uint32_t *cookiep, char *name, int *namelen,
    ino64_t *inop, vnode_t **vpp, char *od_name, int flags, cred_t *cr)
{
    int num_bytes;
    int error = 0;
    char *dirbuf = NULL;

    ASSERT(dvp);
    ASSERT(cookiep);
    ASSERT(name);
    ASSERT(namelen);
    ASSERT(inop);
    ASSERT(cr);

    if (dvp->v_type != VDIR) {
        *namelen = 0;
        return (ENOTDIR);
    }

    if (vpp)
        *vpp = NULL;

    dirbuf = kmem_zalloc(SMB_MINLEN_RDDIR_BUF, KM_SLEEP);
    num_bytes = SMB_MINLEN_RDDIR_BUF;

    /*
     * The goal is to retrieve the first valid entry from *cookiep
     * forward.  smb_vop_readdir_readpage() collects an
     * SMB_MINLEN_RDDIR_BUF-size "page" of directory entry information.
     * smb_vop_readdir_entry() attempts to find the first valid entry
     * in that page.
     */

    while ((error = smb_vop_readdir_readpage(dvp, dirbuf, *cookiep,
        &num_bytes, cr, flags)) == 0) {

        if (num_bytes <= 0)
            break;

        name[0] = '\0';

        error = smb_vop_readdir_entry(dvp, cookiep, name, namelen,
            inop, vpp, od_name, flags, cr, dirbuf,
            num_bytes);

        if (error)
            break;

        if (*name)
            break;

        bzero(dirbuf, SMB_MINLEN_RDDIR_BUF);
        num_bytes = SMB_MINLEN_RDDIR_BUF;
    }


    if (error) {
        kmem_free(dirbuf, SMB_MINLEN_RDDIR_BUF);
        *namelen = 0;
        return (error);
    }

    if (num_bytes == 0) { /* EOF */
        kmem_free(dirbuf, SMB_MINLEN_RDDIR_BUF);
        *cookiep = SMB_EOF;
        *namelen = 0;
        return (0);
    }

    kmem_free(dirbuf, SMB_MINLEN_RDDIR_BUF);
    return (0);
}

/*
 * smb_vop_readdir_readpage()
 *
 * Collects an SMB_MINLEN_RDDIR_BUF "page" of directory entries.  (The
 * directory entries are returned in an fs-independent format by the
 * underlying file system.  That is, the "page" of information returned is
 * not literally stored on-disk in the format returned.)
 *
 * Much of the following is borrowed from getdents64()
 *
 * MAXGETDENTS_SIZE is defined in getdents.c
 */

#define MAXGETDENTS_SIZE    (64 * 1024)

static int
smb_vop_readdir_readpage(vnode_t *vp, void *buf, uint32_t offset, int *count,
    cred_t *cr, int flags)
{
    int error = 0;
    int rdirent_flags = 0;
    int sink;
    struct uio auio;
    struct iovec aiov;

    if (vp->v_type != VDIR)
        return (ENOTDIR);

    /* entflags not working for streams so don't try to use them */
    if (!(flags & SMB_STREAM_RDDIR) &&
        (vfs_has_feature(vp->v_vfsp, VFSFT_DIRENTFLAGS))) {
        /*
         * Setting V_RDDIR_ENTFLAGS will cause the buffer to
         * be filled with edirent_t structures (instead of
         * dirent64_t structures).
         */
        rdirent_flags = V_RDDIR_ENTFLAGS;

        if (*count < sizeof (edirent_t))
            return (EINVAL);
    } else {
        if (*count < sizeof (dirent64_t))
            return (EINVAL);
    }

    if (*count > MAXGETDENTS_SIZE)
        *count = MAXGETDENTS_SIZE;

    aiov.iov_base = buf;
    aiov.iov_len = *count;
    auio.uio_iov = &aiov;
    auio.uio_iovcnt = 1;
    auio.uio_loffset = (uint64_t)offset;
    auio.uio_segflg = UIO_SYSSPACE;
    auio.uio_resid = *count;
    auio.uio_fmode = 0;

    (void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
    error = VOP_READDIR(vp, &auio, cr, &sink, &smb_ct, rdirent_flags);
    VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);

    if (error) {
        if (error == ENOENT) {
            /* Fake EOF if offset is bad due to dropping of lock */
            *count = 0;
            return (0);
        } else {
            return (error);
        }
    }

    /*
     * Windows cannot handle an offset > SMB_EOF.
     * Pretend we are at EOF.
     */

    if (auio.uio_loffset > SMB_EOF) {
        *count = 0;
        return (0);
    }

    *count = *count - auio.uio_resid;
    return (0);
}

/*
 * smb_vop_readdir_entry()
 *
 * This function retrieves the first valid entry from the
 * SMB_MINLEN_RDDIR_BUF-sized buffer returned by smb_vop_readdir_readpage()
 * to smb_vop_readdir().
 *
 * Both dirent64_t and edirent_t structures need to be handled.  The former is
 * needed for file systems that do not support VFSFT_DIRENTFLAGS.  The latter
 * is required for proper handling of case collisions on file systems that
 * support case-insensitivity.  edirent_t structures are also used for
 * case-sensitive file systems if VFSFT_DIRENTFLAGS is supported.
 */

static int
smb_vop_readdir_entry(vnode_t *dvp, uint32_t *cookiep, char *name, int *namelen,
    ino64_t *inop, vnode_t **vpp, char *od_name, int flags, cred_t *cr,
    char *dirbuf, int num_bytes)
{
    uint32_t next_cookie;
    int ebufsize;
    int error = 0;
    int len;
    int rc;
    char shortname[MANGLE_NAMELEN];
    char name83[MANGLE_NAMELEN];
    char *ebuf = NULL;
    edirent_t *edp;
    dirent64_t *dp = NULL;
    vnode_t *vp = NULL;

    ASSERT(dirbuf);

    /*
     * Use edirent_t structure for both
     * entflags not working for streams so don't try to use them
     */
    if (!(flags & SMB_STREAM_RDDIR) &&
        (vfs_has_feature(dvp->v_vfsp, VFSFT_DIRENTFLAGS))) {
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        edp = (edirent_t *)dirbuf;
    } else {
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        dp = (dirent64_t *)dirbuf;
        ebufsize = EDIRENT_RECLEN(MAXNAMELEN);
        ebuf = kmem_zalloc(ebufsize, KM_SLEEP);
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        edp = (edirent_t *)ebuf;
    }

    while (edp) {
        if (dp)
            DP_TO_EDP(dp, edp);

        next_cookie = (uint32_t)edp->ed_off;
        if (edp->ed_ino == 0) {
            *cookiep = next_cookie;

            if (dp) {
                /*LINTED E_BAD_PTR_CAST_ALIGN*/
                DP_ADVANCE(dp, dirbuf, num_bytes);
                if (dp == NULL)
                    edp = NULL;
            } else {
                /*LINTED E_BAD_PTR_CAST_ALIGN*/
                EDP_ADVANCE(edp, dirbuf, num_bytes);
            }
            continue;
        }

        len = strlen(edp->ed_name);

        if (*namelen < len) {
            *namelen = 0;

            if (ebuf)
                kmem_free(ebuf, ebufsize);

            return (EOVERFLOW);
        }

        /*
         * Do not pass SMB_IGNORE_CASE to smb_vop_lookup
         */

        error = smb_vop_lookup(dvp, edp->ed_name, vpp ? vpp : &vp,
            od_name, 0, NULL, cr);

        if (error) {
            if (error == ENOENT) {
                *cookiep = (uint32_t)next_cookie;

                if (dp) {
                    /*LINTED E_BAD_PTR_CAST_ALIGN*/
                    DP_ADVANCE(dp, dirbuf, num_bytes);
                    if (dp == NULL)
                        edp = NULL;
                } else {
                    /*LINTED E_BAD_PTR_CAST_ALIGN*/
                    EDP_ADVANCE(edp, dirbuf, num_bytes);
                }
                continue;
            }


            *namelen = 0;

            if (ebuf)
                kmem_free(ebuf, ebufsize);

            return (error);
        }

        if ((flags & SMB_IGNORE_CASE) && ED_CASE_CONFLICTS(edp)) {
            rc = smb_mangle_name(edp->ed_ino, edp->ed_name,
                shortname, name83, 1);

            if (rc == 1) { /* success */
                (void) strlcpy(name, shortname, *namelen + 1);
                *namelen = strlen(shortname);
            } else {
                (void) strlcpy(name, edp->ed_name,
                    *namelen + 1);
                name[*namelen] = '\0';
            }

        } else {
            (void) strlcpy(name, edp->ed_name, *namelen + 1);
                *namelen = len;
        }

        if (vpp == NULL)
            VN_RELE(vp);

        if (inop)
            *inop = edp->ed_ino;

        *cookiep = (uint32_t)next_cookie;
        break;
    }

    if (ebuf)
        kmem_free(ebuf, ebufsize);

    return (error);
}

/*
 * smb_sa_to_va_mask
 *
 * Set va_mask by running through the SMB_AT_* #define's and
 * setting those bits that correspond to the SMB_AT_* bits
 * set in sa_mask.
 */

void
smb_sa_to_va_mask(uint_t sa_mask, uint_t *va_maskp)
{
    int i;
    uint_t smask;

    smask = (sa_mask);
    for (i = SMB_AT_TYPE; (i < SMB_AT_MAX) && (smask != 0); ++i) {
        if (smask & 1)
            *(va_maskp) |= smb_attrmap[i];

        smask >>= 1;
    }
}

/*
 * smb_vop_getdents()
 *
 * Upon success, the smb_node corresponding to each entry returned will
 * have a reference taken on it.  These will be released in
 * smb_trans2_find_get_dents().
 *
 * If an error is returned from this routine, a list of already processed
 * entries will be returned.  The smb_nodes corresponding to these entries
 * will be referenced, and will be released in smb_trans2_find_get_dents().
 *
 * The returned dp->d_name field will contain either the on-disk name or, if
 * it needs mangling or has a case-insensitive collision, the mangled
 * "shortname."  In this case, the on-disk name can be retrieved from the
 * smb_node's od_name (the smb_node is passed to smb_gather_dents_info()).
 */

int /*ARGSUSED*/
smb_vop_getdents(
    smb_node_t      *dir_snode,
    uint32_t        *cookiep,
    uint64_t        *verifierp,
    int32_t     *dircountp,
    char        *arg,
    char        *pattern,
    uint32_t        flags,
    smb_request_t   *sr,
    cred_t      *cr)
{
    int     error = 0;
    int     maxentries;
    int     num_bytes;
    int     resid;
    char        *dirbuf = NULL;
    vnode_t     *dvp;
    /*LINTED E_BAD_PTR_CAST_ALIGN*/
    smb_dent_info_hdr_t *ihdr = (smb_dent_info_hdr_t *)arg;

    dvp = dir_snode->vp;

    resid = ihdr->uio.uio_resid;
    maxentries = resid / SMB_MAX_DENT_INFO_SIZE;

    bzero(ihdr->iov->iov_base, resid);

    dirbuf = kmem_alloc(SMB_MINLEN_RDDIR_BUF, KM_SLEEP);

    while (maxentries) {

        bzero(dirbuf, SMB_MINLEN_RDDIR_BUF);

        num_bytes = SMB_MINLEN_RDDIR_BUF;
        error = smb_vop_readdir_readpage(dvp, dirbuf, *cookiep,
            &num_bytes, cr, flags);

        if (error || (num_bytes <= 0))
            break;

        error = smb_vop_getdents_entries(dir_snode, cookiep, dircountp,
            arg, flags, sr, cr, dirbuf, &maxentries, num_bytes,
            pattern);

        if (error)
            goto out;
    }

    if (num_bytes < 0) {
        error = -1;
    } else if (num_bytes == 0) {
        *cookiep = SMB_EOF;
        error = 0;
    } else {
        error = 0;
    }

out:
    if (dirbuf)
        kmem_free(dirbuf, SMB_MINLEN_RDDIR_BUF);

    return (error);
}

/*
 * smb_vop_getdents_entries()
 *
 * This function retrieves names from the SMB_MINLEN_RDDIR_BUF-sized buffer
 * returned by smb_vop_readdir_readpage() to smb_vop_getdents().
 *
 * Both dirent64_t and edirent_t structures need to be handled.  The former is
 * needed for file systems that do not support VFSFT_DIRENTFLAGS.  The latter
 * is required for properly handling case collisions on file systems that
 * support case-insensitivity.  edirent_t is also used on case-sensitive
 * file systems where VFSFT_DIRENTFLAGS is available.
 */

static int
smb_vop_getdents_entries(
    smb_node_t      *dir_snode,
    uint32_t        *cookiep,
    int32_t     *dircountp,
    char        *arg,
    uint32_t        flags,
    struct smb_request  *sr,
    cred_t      *cr,
    char        *dirbuf,
    int         *maxentries,
    int         num_bytes,
    char        *pattern)
{
    uint32_t    next_cookie;
    int     ebufsize;
    char        *tmp_name;
    int     error;
    int     rc;
    char        shortname[MANGLE_NAMELEN];
    char        name83[MANGLE_NAMELEN];
    char        *ebuf = NULL;
    dirent64_t  *dp = NULL;
    edirent_t   *edp;
    smb_node_t  *ret_snode;
    smb_attr_t  ret_attr;
    vnode_t     *dvp;
    vnode_t     *fvp;

    ASSERT(dirbuf);

    dvp = dir_snode->vp;

    if (vfs_has_feature(dvp->v_vfsp, VFSFT_DIRENTFLAGS)) {
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        edp = (edirent_t *)dirbuf;
    } else {
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        dp = (dirent64_t *)dirbuf;
        ebufsize = EDIRENT_RECLEN(MAXNAMELEN);
        ebuf = kmem_zalloc(ebufsize, KM_SLEEP);
        /*LINTED E_BAD_PTR_CAST_ALIGN*/
        edp = (edirent_t *)ebuf;
    }

    while (edp) {
        if (dp)
            DP_TO_EDP(dp, edp);

        if (*maxentries == 0)
            break;

        next_cookie = (uint32_t)edp->ed_off;

        if (edp->ed_ino == 0) {
            *cookiep = next_cookie;
            if (dp) {
                /*LINTED E_BAD_PTR_CAST_ALIGN*/
                DP_ADVANCE(dp, dirbuf, num_bytes);
                if (dp == NULL)
                    edp = NULL;
            } else {
                /*LINTED E_BAD_PTR_CAST_ALIGN*/
                EDP_ADVANCE(edp, dirbuf, num_bytes);
            }
            continue;
        }

        error = smb_vop_lookup(dvp, edp->ed_name, &fvp,
            NULL, 0, NULL, cr);

        if (error) {
            if (error == ENOENT) {
                *cookiep = next_cookie;
                if (dp) {
                    /*LINTED E_BAD_PTR_CAST_ALIGN*/
                    DP_ADVANCE(dp, dirbuf,
                        num_bytes);
                    if (dp == NULL)
                        edp = NULL;
                } else {
                    /*LINTED E_BAD_PTR_CAST_ALIGN*/
                    EDP_ADVANCE(edp, dirbuf,
                        num_bytes);
                }
                continue;
            }
            if (ebuf)
                kmem_free(ebuf, ebufsize);

            return (error);
        }

        ret_snode = smb_node_lookup(sr, NULL, cr, fvp,
            edp->ed_name, dir_snode, NULL, &ret_attr);

        if (ret_snode == NULL) {
            VN_RELE(fvp);

            if (ebuf)
                kmem_free(ebuf, ebufsize);

            return (ENOMEM);
        }

        if (smb_match_name(edp->ed_ino, edp->ed_name, shortname,
            name83, pattern, (flags & SMB_IGNORE_CASE))) {

            tmp_name = edp->ed_name;

            if ((flags & SMB_IGNORE_CASE) &&
                ED_CASE_CONFLICTS(edp)) {
                rc = smb_mangle_name(edp->ed_ino, edp->ed_name,
                    shortname, name83, 1);
                if (rc == 1)
                    tmp_name = shortname;
            } else {
                rc = smb_mangle_name(edp->ed_ino, edp->ed_name,
                    shortname, name83, 0);
            }

            if (rc != 1) {
                (void) strlcpy(shortname, edp->ed_name,
                    MANGLE_NAMELEN);
                (void) strlcpy(name83, edp->ed_name,
                    MANGLE_NAMELEN);
                shortname[MANGLE_NAMELEN - 1] = '\0';
                name83[MANGLE_NAMELEN - 1] = '\0';
            }

            error = smb_gather_dents_info(arg, edp->ed_ino,
                strlen(tmp_name), tmp_name, next_cookie, dircountp,
                &ret_attr, ret_snode, shortname, name83);

            if (error > 0) {
                if (ebuf)
                    kmem_free(ebuf, ebufsize);
                return (error);
            }

            /*
             * Treat errors from smb_gather_dents_info() that are
             * < 0 the same as EOF.
             */
            if (error < 0) {
                if (ebuf)
                    kmem_free(ebuf, ebufsize);
                *maxentries = 0;
                return (0);
            }
            (*maxentries)--;
        } else {
            smb_node_release(ret_snode);
        }

        *cookiep = next_cookie;

        if (dp) {
            /*LINTED E_BAD_PTR_CAST_ALIGN*/
            DP_ADVANCE(dp, dirbuf, num_bytes);
            if (dp == NULL)
                edp = NULL;
        } else {
            /*LINTED E_BAD_PTR_CAST_ALIGN*/
            EDP_ADVANCE(edp, dirbuf, num_bytes);
        }
    }

    if (ebuf)
        kmem_free(ebuf, ebufsize);

    return (0);
}

/*
 * smb_vop_stream_lookup()
 *
 * The name returned in od_name is the on-disk name of the stream with the
 * SMB_STREAM_PREFIX stripped off.  od_name should be allocated to MAXNAMELEN
 * by the caller.
 */

int
smb_vop_stream_lookup(vnode_t *fvp, char *stream_name, vnode_t **vpp,
    char *od_name, vnode_t **xattrdirvpp, int flags, vnode_t *rootvp,
    cred_t *cr)
{
    char *solaris_stream_name;
    char *name;
    int error;

    if ((error = smb_vop_lookup_xattrdir(fvp, xattrdirvpp,
        LOOKUP_XATTR | CREATE_XATTR_DIR, cr)) != 0)
        return (error);

    /*
     * Prepend SMB_STREAM_PREFIX to stream name
     */

    solaris_stream_name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
    (void) sprintf(solaris_stream_name, "%s%s", SMB_STREAM_PREFIX,
        stream_name);

    /*
     * "name" will hold the on-disk name returned from smb_vop_lookup
     * for the stream, including the SMB_STREAM_PREFIX.
     */

    name = kmem_zalloc(MAXNAMELEN, KM_SLEEP);

    if ((error = smb_vop_lookup(*xattrdirvpp, solaris_stream_name, vpp,
        name, flags, rootvp, cr)) != 0) {
        VN_RELE(*xattrdirvpp);
    } else {
        (void) strlcpy(od_name, &(name[SMB_STREAM_PREFIX_LEN]),
            MAXNAMELEN);
    }

    kmem_free(solaris_stream_name, MAXNAMELEN);
    kmem_free(name, MAXNAMELEN);

    return (error);
}

int
smb_vop_stream_create(vnode_t *fvp, char *stream_name, smb_attr_t *attr,
    vnode_t **vpp, vnode_t **xattrdirvpp, int flags, cred_t *cr)
{
    char *solaris_stream_name;
    int error;

    if ((error = smb_vop_lookup_xattrdir(fvp, xattrdirvpp,
        LOOKUP_XATTR | CREATE_XATTR_DIR, cr)) != 0)
        return (error);

    /*
     * Prepend SMB_STREAM_PREFIX to stream name
     */

    solaris_stream_name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
    (void) sprintf(solaris_stream_name, "%s%s", SMB_STREAM_PREFIX,
        stream_name);

    if ((error = smb_vop_create(*xattrdirvpp, solaris_stream_name, attr,
        vpp, flags, cr, NULL)) != 0)
        VN_RELE(*xattrdirvpp);

    kmem_free(solaris_stream_name, MAXNAMELEN);

    return (error);
}

int
smb_vop_stream_remove(vnode_t *vp, char *stream_name, int flags, cred_t *cr)
{
    char *solaris_stream_name;
    vnode_t *xattrdirvp;
    int error;

    if ((error = smb_vop_lookup_xattrdir(vp, &xattrdirvp, LOOKUP_XATTR, cr))
        != 0)
        return (error);

    /*
     * Prepend SMB_STREAM_PREFIX to stream name
     */

    solaris_stream_name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
    (void) sprintf(solaris_stream_name, "%s%s", SMB_STREAM_PREFIX,
        stream_name);

    /* XXX might have to use kcred */
    error = smb_vop_remove(xattrdirvp, solaris_stream_name, flags, cr);

    kmem_free(solaris_stream_name, MAXNAMELEN);

    return (error);
}

/*
 * smb_vop_stream_readdir()
 *
 * Note: stream_info.size is not filled in in this routine.
 * It needs to be filled in by the caller due to the parameters for getattr.
 *
 * stream_info.name is set to the on-disk stream name with the SMB_STREAM_PREFIX
 * removed.
 */

int
smb_vop_stream_readdir(vnode_t *fvp, uint32_t *cookiep,
    struct fs_stream_info *stream_info, vnode_t **vpp, vnode_t **xattrdirvpp,
    int flags, cred_t *cr)
{
    int nsize = MAXNAMELEN-1;
    int error = 0;
    ino64_t ino;
    char *tmp_name;
    vnode_t *xattrdirvp;
    vnode_t *vp;

    if ((error = smb_vop_lookup_xattrdir(fvp, &xattrdirvp, LOOKUP_XATTR,
        cr)) != 0)
        return (error);

    bzero(stream_info->name, sizeof (stream_info->name));
    stream_info->size = 0;

    tmp_name = kmem_zalloc(MAXNAMELEN, KM_SLEEP);

    for (;;) {
        error = smb_vop_readdir(xattrdirvp, cookiep, tmp_name, &nsize,
            &ino, &vp, NULL, flags | SMB_STREAM_RDDIR, cr);

        if (error || (*cookiep == SMB_EOF))
            break;

        if (strncmp(tmp_name, SMB_STREAM_PREFIX,
            SMB_STREAM_PREFIX_LEN)) {
            VN_RELE(vp);
            continue;
        }

        tmp_name[nsize] = '\0';
        (void) strlcpy(stream_info->name,
            &(tmp_name[SMB_STREAM_PREFIX_LEN]),
            sizeof (stream_info->name));

        nsize -= SMB_STREAM_PREFIX_LEN;
        break;
    }

    if ((error == 0) && nsize) {
        if (vpp)
            *vpp = vp;
        else
            VN_RELE(vp);

        if (xattrdirvpp)
            *xattrdirvpp = xattrdirvp;
        else
            VN_RELE(xattrdirvp);

    } else {
        VN_RELE(xattrdirvp);
    }

    kmem_free(tmp_name, MAXNAMELEN);

    return (error);
}

int
smb_vop_lookup_xattrdir(vnode_t *fvp, vnode_t **xattrdirvpp, int flags,
    cred_t *cr)
{
    int error;

    error = VOP_LOOKUP(fvp, "", xattrdirvpp, NULL, flags, NULL, cr,
        &smb_ct, NULL, NULL);
    return (error);
}

/*
 * smb_vop_traverse_check()
 *
 * This function checks to see if the passed-in vnode has a file system
 * mounted on it.  If it does, the mount point is "traversed" and the
 * vnode for the root of the file system is returned.
 */

int
smb_vop_traverse_check(vnode_t **vpp)
{
    int error;

    if (vn_mountedvfs(*vpp) == 0)
        return (0);

    /*
     * traverse() may return a different held vnode, even in the error case.
     * If it returns a different vnode, it will have released the original.
     */

    error = traverse(vpp);

    return (error);
}

int /*ARGSUSED*/
smb_vop_statfs(vnode_t *vp, struct statvfs64 *statp, cred_t *cr)
{
    int error;

    error = VFS_STATVFS(vp->v_vfsp, statp);

    return (error);
}

/*
 * smb_vop_acl_read
 *
 * Reads the ACL of the specified file into 'aclp'.
 * acl_type is the type of ACL which the filesystem supports.
 *
 * Caller has to free the allocated memory for aclp by calling
 * acl_free().
 */
int
smb_vop_acl_read(vnode_t *vp, acl_t **aclp, int flags, acl_type_t acl_type,
    cred_t *cr)
{
    int error;
    vsecattr_t vsecattr;

    ASSERT(vp);
    ASSERT(aclp);

    *aclp = NULL;
    bzero(&vsecattr, sizeof (vsecattr_t));

    switch (acl_type) {
    case ACLENT_T:
        vsecattr.vsa_mask = VSA_ACL | VSA_ACLCNT | VSA_DFACL |
            VSA_DFACLCNT;
        break;

    case ACE_T:
        vsecattr.vsa_mask = VSA_ACE | VSA_ACECNT | VSA_ACE_ACLFLAGS;
        break;

    default:
        return (EINVAL);
    }

    if (error = VOP_GETSECATTR(vp, &vsecattr, flags, cr, &smb_ct))
        return (error);

    *aclp = smb_fsacl_from_vsa(&vsecattr, acl_type);
    if (vp->v_type == VDIR)
        (*aclp)->acl_flags |= ACL_IS_DIR;

    return (0);
}

/*
 * smb_vop_acl_write
 *
 * Writes the given ACL in aclp for the specified file.
 */
int
smb_vop_acl_write(vnode_t *vp, acl_t *aclp, int flags, cred_t *cr)
{
    int error;
    vsecattr_t vsecattr;
    int aclbsize;

    ASSERT(vp);
    ASSERT(aclp);

    error = smb_fsacl_to_vsa(aclp, &vsecattr, &aclbsize);

    if (error == 0) {
        (void) VOP_RWLOCK(vp, V_WRITELOCK_TRUE, NULL);
        error = VOP_SETSECATTR(vp, &vsecattr, flags, cr, &smb_ct);
        VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL);
    }

    if (aclbsize && vsecattr.vsa_aclentp)
        kmem_free(vsecattr.vsa_aclentp, aclbsize);

    return (error);
}

/*
 * smb_vop_acl_type
 *
 * Determines the ACL type for the given vnode.
 * ACLENT_T is a Posix ACL and ACE_T is a ZFS ACL.
 */
acl_type_t
smb_vop_acl_type(vnode_t *vp)
{
    int error;
    ulong_t whichacl;

    error = VOP_PATHCONF(vp, _PC_ACL_ENABLED, &whichacl, kcred, NULL);
    if (error != 0) {
        /*
         * If we got an error, then the filesystem
         * likely does not understand the _PC_ACL_ENABLED
         * pathconf.  In this case, we fall back to trying
         * POSIX-draft (aka UFS-style) ACLs.
         */
        whichacl = _ACL_ACLENT_ENABLED;
    }

    if (!(whichacl & (_ACL_ACE_ENABLED | _ACL_ACLENT_ENABLED))) {
        /*
         * If the file system supports neither ACE nor
         * ACLENT ACLs we will fall back to UFS-style ACLs
         * like we did above if there was an error upon
         * calling VOP_PATHCONF.
         *
         * ACE and ACLENT type ACLs are the only interfaces
         * supported thus far.  If any other bits are set on
         * 'whichacl' upon return from VOP_PATHCONF, we will
         * ignore them.
         */
        whichacl = _ACL_ACLENT_ENABLED;
    }

    if (whichacl == _ACL_ACLENT_ENABLED)
        return (ACLENT_T);

    return (ACE_T);
}

static int zfs_perms[] = {
    ACE_READ_DATA, ACE_WRITE_DATA, ACE_APPEND_DATA, ACE_READ_NAMED_ATTRS,
    ACE_WRITE_NAMED_ATTRS, ACE_EXECUTE, ACE_DELETE_CHILD,
    ACE_READ_ATTRIBUTES, ACE_WRITE_ATTRIBUTES, ACE_DELETE, ACE_READ_ACL,
    ACE_WRITE_ACL, ACE_WRITE_OWNER, ACE_SYNCHRONIZE
};

static int unix_perms[] = { VREAD, VWRITE, VEXEC };
/*
 * smb_vop_eaccess
 *
 * Returns the effective permission of the given credential for the
 * specified object.
 *
 * This is just a workaround. We need VFS/FS support for this.
 */
void
smb_vop_eaccess(vnode_t *vp, int *mode, int flags, vnode_t *dir_vp, cred_t *cr)
{
    int error, i;
    int pnum;

    *mode = 0;

    if (flags == V_ACE_MASK) {
        pnum = sizeof (zfs_perms) / sizeof (int);

        for (i = 0; i < pnum; i++) {
            error = smb_vop_access(vp, zfs_perms[i], flags,
                dir_vp, cr);
            if (error == 0)
                *mode |= zfs_perms[i];
        }
    } else {
        pnum = sizeof (unix_perms) / sizeof (int);

        for (i = 0; i < pnum; i++) {
            error = smb_vop_access(vp, unix_perms[i], flags,
                dir_vp, cr);
            if (error == 0)
                *mode |= unix_perms[i];
        }
    }
}

/*
 * smb_vop_shrlock()
 *
 * See comments for smb_fsop_shrlock()
 */

int
smb_vop_shrlock(vnode_t *vp, uint32_t uniq_fid, uint32_t desired_access,
    uint32_t share_access, cred_t *cr)
{
    struct shrlock shr;
    struct shr_locowner shr_own;
    short new_access = 0;
    short deny = 0;
    int flag = 0;
    int cmd;

    cmd = (nbl_need_check(vp)) ? F_SHARE_NBMAND : F_SHARE;

    /*
     * Check if this is a metadata access
     */

    if ((desired_access & FILE_DATA_ALL) == 0) {
        new_access |= F_MDACC;
    } else {
        if (desired_access & (ACE_READ_DATA | ACE_EXECUTE)) {
            new_access |= F_RDACC;
            flag |= FREAD;
        }

        if (desired_access & (ACE_WRITE_DATA | ACE_APPEND_DATA |
            ACE_ADD_FILE)) {
            new_access |= F_WRACC;
            flag |= FWRITE;
        }

        if (SMB_DENY_READ(share_access)) {
            deny |= F_RDDNY;
        }

        if (SMB_DENY_WRITE(share_access)) {
            deny |= F_WRDNY;
        }

        if (cmd == F_SHARE_NBMAND) {
            if (desired_access & ACE_DELETE)
                new_access |= F_RMACC;

            if (SMB_DENY_DELETE(share_access)) {
                deny |= F_RMDNY;
            }
        }
    }

    shr.s_access = new_access;
    shr.s_deny = deny;
    shr.s_sysid = smb_ct.cc_sysid;
    shr.s_pid = uniq_fid;
    shr.s_own_len = sizeof (shr_own);
    shr.s_owner = (caddr_t)&shr_own;
    shr_own.sl_id = shr.s_sysid;
    shr_own.sl_pid = shr.s_pid;

    return (VOP_SHRLOCK(vp, cmd, &shr, flag, cr, NULL));
}

int
smb_vop_unshrlock(vnode_t *vp, uint32_t uniq_fid, cred_t *cr)
{
    struct shrlock shr;
    struct shr_locowner shr_own;

    /*
     * For s_access and s_deny, we do not need to pass in the original
     * values.
     */

    shr.s_access = 0;
    shr.s_deny = 0;
    shr.s_sysid = smb_ct.cc_sysid;
    shr.s_pid = uniq_fid;
    shr.s_own_len = sizeof (shr_own);
    shr.s_owner = (caddr_t)&shr_own;
    shr_own.sl_id = shr.s_sysid;
    shr_own.sl_pid = shr.s_pid;

    return (VOP_SHRLOCK(vp, F_UNSHARE, &shr, 0, cr, NULL));
}