solaris/SharedFolders/vboxfs_prov.c

	vboxfs_prov.c revision 6479169ec893c18a646cec595e4e214492d180f0
/** @file
 * VirtualBox File System for Solaris Guests, provider implementation.
 * Portions contributed by: Ronald.
 */

/*
 * Copyright (C) 2008 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */
/*
 * Provider interfaces for shared folder file system.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mntent.h>
#include <sys/param.h>
#include <sys/modctl.h>
#include <sys/mount.h>
#include <sys/policy.h>
#include <sys/atomic.h>
#include <sys/sysmacros.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/dirent.h>
#include "vboxfs_prov.h"
#ifdef u
#undef u
#endif
#include "../../common/VBoxGuestLib/VBoxCalls.h"

#define SFPROV_VERSION  1

static VBSFCLIENT vbox_client;

/*
 * utility to create strings
 */
static SHFLSTRING *
sfprov_string(char *path, int *sz)
{
    SHFLSTRING *str;
    int len = strlen(path);

    *sz = len + 1 + sizeof (*str) - sizeof (str->String);
    str = kmem_zalloc(*sz, KM_SLEEP);
    str->u16Size = len + 1;
    str->u16Length = len;
    strcpy(str->String.utf8, path);
    return (str);
}

sfp_connection_t *
sfprov_connect(int version)
{
    /*
     * only one version for now, so must match
     */
    int rc = -1;
    if (version != SFPROV_VERSION)
    {
        cmn_err(CE_WARN, "sfprov_connect: wrong version");
        return NULL;
    }
    rc = vboxInit();
    if (RT_SUCCESS(rc))
    {
        rc = vboxConnect(&vbox_client);
        if (RT_SUCCESS(rc))
        {
            rc = vboxCallSetUtf8(&vbox_client);
            if (RT_SUCCESS(rc))
            {
                return ((sfp_connection_t *)&vbox_client);
            }
            else
                cmn_err(CE_WARN, "sfprov_connect: vboxCallSetUtf8() failed");

            vboxDisconnect(&vbox_client);
        }
        else
            cmn_err(CE_WARN, "sfprov_connect: vboxConnect() failed rc=%d", rc);
        vboxUninit();
    }
    else
        cmn_err(CE_WARN, "sfprov_connect: vboxInit() failed rc=%d", rc);
}

void
sfprov_disconnect(sfp_connection_t *conn)
{
    if (conn != (sfp_connection_t *)&vbox_client)
        cmn_err(CE_WARN, "sfprov_disconnect: bad argument");
    vboxDisconnect(&vbox_client);
    vboxUninit();
}


/*
 * representation of an active mount point
 */
struct sfp_mount {
    VBSFMAP map;
};

int
sfprov_mount(sfp_connection_t *conn, char *path, sfp_mount_t **mnt)
{
    sfp_mount_t *m;
    SHFLSTRING *str;
    int size;
    int rc;

    m = kmem_zalloc(sizeof (*m), KM_SLEEP);
    str = sfprov_string(path, &size);
    rc = vboxCallMapFolder(&vbox_client, str, &m->map);
    if (!RT_SUCCESS(rc)) {
        cmn_err(CE_WARN, "sfprov_mount: vboxCallMapFolder() failed");
        kmem_free(m, sizeof (*m));
        *mnt = NULL;
        rc = EINVAL;
    } else {
        *mnt = m;
        rc = 0;
    }
    kmem_free(str, size);
    return (rc);
}

int
sfprov_unmount(sfp_mount_t *mnt)
{
    int rc;

    rc = vboxCallUnmapFolder(&vbox_client, &mnt->map);
    if (!RT_SUCCESS(rc)) {
        cmn_err(CE_WARN, "sfprov_mount: vboxCallUnmapFolder() failed");
        rc = EINVAL;
    } else {
        rc = 0;
    }
    kmem_free(mnt, sizeof (*mnt));
    return (rc);
}

/*
 * query information about a mounted file system
 */
int
sfprov_get_blksize(sfp_mount_t *mnt, uint64_t *blksize)
{
    int rc;
    SHFLVOLINFO info;
    uint32_t bytes = sizeof(SHFLVOLINFO);

    rc = vboxCallFSInfo(&vbox_client, &mnt->map, 0,
        (SHFL_INFO_GET | SHFL_INFO_VOLUME), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc))
        return (EINVAL);
    *blksize = info.ulBytesPerAllocationUnit;
    return (0);
}

int
sfprov_get_blksused(sfp_mount_t *mnt, uint64_t *blksused)
{
    int rc;
    SHFLVOLINFO info;
    uint32_t bytes = sizeof(SHFLVOLINFO);

    rc = vboxCallFSInfo(&vbox_client, &mnt->map, 0,
        (SHFL_INFO_GET | SHFL_INFO_VOLUME), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc))
        return (EINVAL);
    *blksused = (info.ullTotalAllocationBytes -
        info.ullAvailableAllocationBytes) / info.ulBytesPerAllocationUnit;
    return (0);
}

int
sfprov_get_blksavail(sfp_mount_t *mnt, uint64_t *blksavail)
{
    int rc;
    SHFLVOLINFO info;
    uint32_t bytes = sizeof(SHFLVOLINFO);

    rc = vboxCallFSInfo(&vbox_client, &mnt->map, 0,
        (SHFL_INFO_GET | SHFL_INFO_VOLUME), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc))
        return (EINVAL);
    *blksavail =
        info.ullAvailableAllocationBytes / info.ulBytesPerAllocationUnit;
    return (0);
}

int
sfprov_get_maxnamesize(sfp_mount_t *mnt, uint32_t *maxnamesize)
{
    int rc;
    SHFLVOLINFO info;
    uint32_t bytes = sizeof(SHFLVOLINFO);

    rc = vboxCallFSInfo(&vbox_client, &mnt->map, 0,
        (SHFL_INFO_GET | SHFL_INFO_VOLUME), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc))
        return (EINVAL);
    *maxnamesize = info.fsProperties.cbMaxComponent;
    return (0);
}

int
sfprov_get_readonly(sfp_mount_t *mnt, uint32_t *readonly)
{
    int rc;
    SHFLVOLINFO info;
    uint32_t bytes = sizeof(SHFLVOLINFO);

    rc = vboxCallFSInfo(&vbox_client, &mnt->map, 0,
        (SHFL_INFO_GET | SHFL_INFO_VOLUME), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc))
        return (EINVAL);
    *readonly = info.fsProperties.fReadOnly;
    return (0);
}

/*
 * File operations: open/close/read/write/etc.
 *
 * open/create can return any relevant errno, however ENOENT
 * generally means that the host file didn't exist.
 */
struct sfp_file {
    SHFLHANDLE handle;
    VBSFMAP map;    /* need this again for the close operation */
};

int
sfprov_create(sfp_mount_t *mnt, char *path, sfp_file_t **fp)
{
    int rc;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    int size;
    sfp_file_t *newfp;

    str = sfprov_string(path, &size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_ACT_CREATE_IF_NEW |
        SHFL_CF_ACT_REPLACE_IF_EXISTS | SHFL_CF_ACCESS_READWRITE;
    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);
    kmem_free(str, size);

    if (RT_FAILURE(rc))
        return (EINVAL);
    if (parms.Handle == SHFL_HANDLE_NIL) {
        if (parms.Result == SHFL_FILE_EXISTS)
            return (EEXIST);
        return (ENOENT);
    }
    newfp = kmem_alloc(sizeof(sfp_file_t), KM_SLEEP);
    newfp->handle = parms.Handle;
    newfp->map = mnt->map;
    *fp = newfp;
    return (0);
}

int
sfprov_open(sfp_mount_t *mnt, char *path, sfp_file_t **fp)
{
    int rc;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    int size;
    sfp_file_t *newfp;

    /*
     * First we attempt to open it read/write. If that fails we
     * try read only.
     */
    bzero(&parms, sizeof(parms));
    str = sfprov_string(path, &size);
    parms.Handle = SHFL_HANDLE_NIL;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READWRITE;
    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);
    if (RT_FAILURE(rc) && rc != VERR_ACCESS_DENIED) {
        kmem_free(str, size);
        return RTErrConvertToErrno(rc);
    }
    if (parms.Handle == SHFL_HANDLE_NIL) {
        if (parms.Result == SHFL_PATH_NOT_FOUND ||
            parms.Result == SHFL_FILE_NOT_FOUND) {
            kmem_free(str, size);
            return (ENOENT);
        }
        parms.CreateFlags =
            SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
        rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);
        if (RT_FAILURE(rc)) {
            kmem_free(str, size);
            return RTErrConvertToErrno(rc);
        }
        if (parms.Handle == SHFL_HANDLE_NIL) {
            kmem_free(str, size);
            return (ENOENT);
        }
    }
    newfp = kmem_alloc(sizeof(sfp_file_t), KM_SLEEP);
    newfp->handle = parms.Handle;
    newfp->map = mnt->map;
    *fp = newfp;
    return (0);
}

int
sfprov_trunc(sfp_mount_t *mnt, char *path)
{
    int rc;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    int size;

    /*
     * open it read/write.
     */
    str = sfprov_string(path, &size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READWRITE |
        SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);

    if (RT_FAILURE(rc)) {
        kmem_free(str, size);
        return (EINVAL);
    }
    (void)vboxCallClose(&vbox_client, &mnt->map, parms.Handle);
    return (0);
}

int
sfprov_close(sfp_file_t *fp)
{
    int rc;

    rc = vboxCallClose(&vbox_client, &fp->map, fp->handle);
    kmem_free(fp, sizeof(sfp_file_t));
    return (0);
}

int
sfprov_read(sfp_file_t *fp, char *buffer, uint64_t offset, uint32_t *numbytes)
{
    int rc;

    rc = vboxCallRead(&vbox_client, &fp->map, fp->handle, offset,
        numbytes, (uint8_t *)buffer, 0);    /* what is that last arg? */
    if (RT_FAILURE(rc))
        return (EINVAL);
    return (0);
}

int
sfprov_write(sfp_file_t *fp, char *buffer, uint64_t offset, uint32_t *numbytes)
{
    int rc;

    rc = vboxCallWrite(&vbox_client, &fp->map, fp->handle, offset,
        numbytes, (uint8_t *)buffer, 0);    /* what is that last arg? */
    if (RT_FAILURE(rc))
        return (EINVAL);
    return (0);
}


static int
sfprov_getinfo(sfp_mount_t *mnt, char *path, RTFSOBJINFO *info)
{
    int rc;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    int size;

    str = sfprov_string(path, &size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_LOOKUP | SHFL_CF_ACT_FAIL_IF_NEW;
    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);
    kmem_free(str, size);

    if (RT_FAILURE(rc))
        return (EINVAL);
    if (parms.Result != SHFL_FILE_EXISTS)
        return (ENOENT);
    *info = parms.Info;
    return (0);
}

/*
 * get information about a file (or directory)
 */
static void
sfprov_mode_from_fmode(mode_t *mode, RTFMODE fMode)
{
    mode_t m = 0;

    if (RTFS_IS_DIRECTORY(fMode))
        m |= S_IFDIR;
    else if (RTFS_IS_FILE(fMode))
        m |= S_IFREG;
    else if (RTFS_IS_FIFO(fMode))
        m |= S_IFIFO;
    else if (RTFS_IS_DEV_CHAR(fMode))
        m |= S_IFCHR;
    else if (RTFS_IS_DEV_BLOCK(fMode))
        m |= S_IFBLK;
    else if (RTFS_IS_SYMLINK(fMode))
        m |= S_IFLNK;
    else if (RTFS_IS_SOCKET(fMode))
        m |= S_IFSOCK;

    if (fMode & RTFS_UNIX_IRUSR)
        m |= S_IRUSR;
    if (fMode & RTFS_UNIX_IWUSR)
        m |= S_IWUSR;
    if (fMode & RTFS_UNIX_IXUSR)
        m |= S_IXUSR;
    if (fMode & RTFS_UNIX_IRGRP)
        m |= S_IRGRP;
    if (fMode & RTFS_UNIX_IWGRP)
        m |= S_IWGRP;
    if (fMode & RTFS_UNIX_IXGRP)
        m |= S_IXGRP;
    if (fMode & RTFS_UNIX_IROTH)
        m |= S_IROTH;
    if (fMode & RTFS_UNIX_IWOTH)
        m |= S_IWOTH;
    if (fMode & RTFS_UNIX_IXOTH)
        m |= S_IXOTH;
    if (fMode & RTFS_UNIX_ISUID)
        m |= S_ISUID;
    if (fMode & RTFS_UNIX_ISGID)
        m |= S_ISGID;
    if (fMode & RTFS_UNIX_ISTXT)
        m |= S_ISVTX;
    *mode = m;
}

/*
 * get information about a file (or directory)
 */
int
sfprov_get_mode(sfp_mount_t *mnt, char *path, mode_t *mode)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    sfprov_mode_from_fmode(mode, info.Attr.fMode);
    return (0);
}

int
sfprov_get_size(sfp_mount_t *mnt, char *path, uint64_t *size)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    *size = info.cbObject;
    return (0);
}

static void
sfprov_ftime_from_timespec(timestruc_t *time, RTTIMESPEC *ts)
{
    uint64_t nanosec = RTTimeSpecGetNano(ts);
    time->tv_sec = nanosec / UINT64_C(1000000000);
    time->tv_nsec = nanosec % UINT64_C(1000000000);
}

int
sfprov_get_atime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    sfprov_ftime_from_timespec(time, &info.AccessTime);
    return (0);
}

int
sfprov_get_mtime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    sfprov_ftime_from_timespec(time, &info.ModificationTime);
    return (0);
}

int
sfprov_get_ctime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    sfprov_ftime_from_timespec(time, &info.ChangeTime);
    return (0);
}

int
sfprov_get_attr(
    sfp_mount_t *mnt,
    char *path,
    mode_t *mode,
    uint64_t *size,
    timestruc_t *atime,
    timestruc_t *mtime,
    timestruc_t *ctime)
{
    int rc;
    RTFSOBJINFO info;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);

    if (mode)
        sfprov_mode_from_fmode(mode, info.Attr.fMode);
    if (size != NULL)
        *size = info.cbObject;
    if (atime != NULL)
        sfprov_ftime_from_timespec(atime, &info.AccessTime);
    if (mtime != NULL)
        sfprov_ftime_from_timespec(mtime, &info.ModificationTime);
    if (ctime != NULL)
        sfprov_ftime_from_timespec(ctime, &info.ChangeTime);

    return (0);
}

static void
sfprov_timespec_from_ftime(RTTIMESPEC *ts, timestruc_t time)
{
    uint64_t nanosec = UINT64_C(1000000000) * time.tv_sec + time.tv_nsec;
    RTTimeSpecSetNano(ts, nanosec);
}

int
sfprov_set_attr(
    sfp_mount_t *mnt,
    char *path,
    uint_t mask,
    mode_t mode,
    timestruc_t atime,
    timestruc_t mtime,
    timestruc_t ctime)
{
    int rc, err;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    RTFSOBJINFO info;
    uint32_t bytes;
    int str_size;

    str = sfprov_string(path, &str_size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_ACT_OPEN_IF_EXISTS
              | SHFL_CF_ACT_FAIL_IF_NEW
              | SHFL_CF_ACCESS_ATTR_WRITE;

    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);

    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_attr: vboxCallCreate(%s) failed rc=%d",
            path, rc);
        err = EINVAL;
        goto fail2;
    }
    if (parms.Result != SHFL_FILE_EXISTS) {
        err = ENOENT;
        goto fail1;
    }

    RT_ZERO(info);
    if (mask & AT_MODE) {
#define mode_set(r) ((mode & (S_##r)) ? RTFS_UNIX_##r : 0)

        info.Attr.fMode  = mode_set (ISUID);
        info.Attr.fMode |= mode_set (ISGID);
        info.Attr.fMode |= (mode & S_ISVTX) ? RTFS_UNIX_ISTXT : 0;
        info.Attr.fMode |= mode_set (IRUSR);
        info.Attr.fMode |= mode_set (IWUSR);
        info.Attr.fMode |= mode_set (IXUSR);
        info.Attr.fMode |= mode_set (IRGRP);
        info.Attr.fMode |= mode_set (IWGRP);
        info.Attr.fMode |= mode_set (IXGRP);
        info.Attr.fMode |= mode_set (IROTH);
        info.Attr.fMode |= mode_set (IWOTH);
        info.Attr.fMode |= mode_set (IXOTH);

        if (S_ISDIR(mode))
            info.Attr.fMode |= RTFS_TYPE_DIRECTORY;
        else if (S_ISREG(mode))
            info.Attr.fMode |= RTFS_TYPE_FILE;
        else if (S_ISFIFO(mode))
            info.Attr.fMode |= RTFS_TYPE_FIFO;
        else if (S_ISCHR(mode))
            info.Attr.fMode |= RTFS_TYPE_DEV_CHAR;
        else if (S_ISBLK(mode))
            info.Attr.fMode |= RTFS_TYPE_DEV_BLOCK;
        else if (S_ISLNK(mode))
            info.Attr.fMode |= RTFS_TYPE_SYMLINK;
        else if (S_ISSOCK(mode))
            info.Attr.fMode |= RTFS_TYPE_SOCKET;
        else
            info.Attr.fMode |= RTFS_TYPE_FILE;
    }

    if (mask & AT_ATIME)
        sfprov_timespec_from_ftime(&info.AccessTime, atime);
    if (mask & AT_MTIME)
        sfprov_timespec_from_ftime(&info.ModificationTime, mtime);
    if (mask & AT_CTIME)
        sfprov_timespec_from_ftime(&info.ChangeTime, ctime);

    bytes = sizeof(info);
    rc = vboxCallFSInfo(&vbox_client, &mnt->map, parms.Handle,
        (SHFL_INFO_SET | SHFL_INFO_FILE), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_attr: vboxCallFSInfo(%s, FILE) failed rc=%d",
            path, rc);
        err = RTErrConvertToErrno(rc);
        goto fail1;
    }

    err = 0;

fail1:
    rc = vboxCallClose(&vbox_client, &mnt->map, parms.Handle);
    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_attr: vboxCallClose(%s) failed rc=%d",
            path, rc);
    }
fail2:
    kmem_free(str, str_size);
    return err;
}

int
sfprov_set_size(sfp_mount_t *mnt, char *path, uint64_t size)
{
    int rc, err;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    RTFSOBJINFO info;
    uint32_t bytes;
    int str_size;

    str = sfprov_string(path, &str_size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_ACT_OPEN_IF_EXISTS
              | SHFL_CF_ACT_FAIL_IF_NEW
              | SHFL_CF_ACCESS_WRITE;

    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);

    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_size: vboxCallCreate(%s) failed rc=%d",
            path, rc);
        err = EINVAL;
        goto fail2;
    }
    if (parms.Result != SHFL_FILE_EXISTS) {
        err = ENOENT;
        goto fail1;
    }

    RT_ZERO(info);
    info.cbObject = size;
    bytes = sizeof(info);
    rc = vboxCallFSInfo(&vbox_client, &mnt->map, parms.Handle,
        (SHFL_INFO_SET | SHFL_INFO_SIZE), &bytes, (SHFLDIRINFO *)&info);
    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_size: vboxCallFSInfo(%s, SIZE) failed rc=%d",
            path, rc);
        err = RTErrConvertToErrno(rc);
        goto fail1;
    }

    err = 0;

fail1:
    rc = vboxCallClose(&vbox_client, &mnt->map, parms.Handle);
    if (RT_FAILURE(rc)) {
        cmn_err(CE_WARN, "sfprov_set_size: vboxCallClose(%s) failed rc=%d",
            path, rc);
    }
fail2:
    kmem_free(str, str_size);
    return err;
}

/*
 * Directory operations
 */
int
sfprov_mkdir(sfp_mount_t *mnt, char *path, sfp_file_t **fp)
{
    int rc;
    SHFLCREATEPARMS parms;
    SHFLSTRING *str;
    int size;
    sfp_file_t *newfp;

    str = sfprov_string(path, &size);
    parms.Handle = 0;
    parms.Info.cbObject = 0;
    parms.CreateFlags = SHFL_CF_DIRECTORY | SHFL_CF_ACT_CREATE_IF_NEW |
        SHFL_CF_ACT_FAIL_IF_EXISTS | SHFL_CF_ACCESS_READ;
    rc = vboxCallCreate(&vbox_client, &mnt->map, str, &parms);
    kmem_free(str, size);

    if (RT_FAILURE(rc))
        return (EINVAL);
    if (parms.Handle == SHFL_HANDLE_NIL) {
        if (parms.Result == SHFL_FILE_EXISTS)
            return (EEXIST);
        return (ENOENT);
    }
    newfp = kmem_alloc(sizeof(sfp_file_t), KM_SLEEP);
    newfp->handle = parms.Handle;
    newfp->map = mnt->map;
    *fp = newfp;
    return (0);
}

int
sfprov_remove(sfp_mount_t *mnt, char *path)
{
    int rc;
    SHFLSTRING *str;
    int size;

    str = sfprov_string(path, &size);
    rc = vboxCallRemove(&vbox_client, &mnt->map, str, SHFL_REMOVE_FILE);
    kmem_free(str, size);
    if (RT_FAILURE(rc))
        return (EINVAL);
    return (0);
}

int
sfprov_rmdir(sfp_mount_t *mnt, char *path)
{
    int rc;
    SHFLSTRING *str;
    int size;

    str = sfprov_string(path, &size);
    rc = vboxCallRemove(&vbox_client, &mnt->map, str, SHFL_REMOVE_DIR);
    kmem_free(str, size);
    if (RT_FAILURE(rc))
        return (RTErrConvertToErrno(rc));
    return (0);
}

int
sfprov_rename(sfp_mount_t *mnt, char *from, char *to, uint_t is_dir)
{
    int rc;
    SHFLSTRING *old, *new;
    int old_size, new_size;

    old = sfprov_string(from, &old_size);
    new = sfprov_string(to, &new_size);
    rc = vboxCallRename(&vbox_client, &mnt->map, old, new,
        (is_dir ? SHFL_RENAME_DIR : SHFL_RENAME_FILE) |
        SHFL_RENAME_REPLACE_IF_EXISTS);
    kmem_free(old, old_size);
    kmem_free(new, new_size);
    if (RT_FAILURE(rc))
        return (RTErrConvertToErrno(rc));
    return (0);
}


/*
 * Read all filenames in a directory.
 *
 * - success - all entries read and returned
 * - ENOENT - Couldn't open the directory for reading
 * - EINVAL - Internal error of some kind
 *
 * On successful return, *dirents points to a list of sffs_dirents_t;
 * for each dirent, all fields except the d_ino will be set appropriately.
 * The caller is responsible for freeing the dirents buffer.
 */
int
sfprov_readdir(
    sfp_mount_t *mnt,
    char *path,
    sffs_dirents_t **dirents,
    sffs_stats_t **stats)
{
    int error;
    char *cp;
    int len;
    SHFLSTRING *mask_str = NULL;    /* must be path with "/*" appended */
    int mask_size;
    sfp_file_t *fp;
    uint32_t infobuff_alloc = 16384;
    SHFLDIRINFO *infobuff = NULL, *info;
    uint32_t numbytes;
    uint32_t nents;
    uint32_t size;
    uint32_t cnt;
    sffs_dirents_t *cur_buf;
    sffs_stats_t *cur_stats;
    struct dirent64 *dirent;
    sffs_stat_t *stat;
    unsigned short reclen;

    *dirents = NULL;
    *stats = NULL;

    error = sfprov_open(mnt, path, &fp);
    if (error != 0)
        return (ENOENT);

    /*
     * Allocate the first dirents and stats buffers.
     */
    *dirents = kmem_alloc(SFFS_DIRENTS_SIZE, KM_SLEEP);
    if (*dirents == NULL) {
        error = (ENOSPC);
        goto done;
    }
    cur_buf = *dirents;
    cur_buf->sf_next = NULL;
    cur_buf->sf_len = 0;

    *stats = kmem_alloc(sizeof(**stats), KM_SLEEP);
    if (*stats == NULL) {
        error = (ENOSPC);
        goto done;
    }
    cur_stats = *stats;
    cur_stats->sf_next = NULL;
    cur_stats->sf_num = 0;

    /*
     * Create mask that VBox expects. This needs to be the directory path,
     * plus a "*" wildcard to get all files.
     */
    len = strlen(path) + 3;
    cp = kmem_alloc(len, KM_SLEEP);
    if (cp == NULL) {
        error = (ENOSPC);
        goto done;
    }
    strcpy(cp, path);
    strcat(cp, "/*");
    mask_str = sfprov_string(cp, &mask_size);
    kmem_free(cp, len);

    /*
     * Now loop using vboxCallDirInfo
     */
    infobuff = kmem_alloc(infobuff_alloc, KM_SLEEP);
    if (infobuff == NULL) {
        error = (ENOSPC);
        goto done;
    }

    cnt = 0;
    for (;;) {
        numbytes = infobuff_alloc;
        error = vboxCallDirInfo(&vbox_client, &fp->map, fp->handle,
            mask_str, 0, 0, &numbytes, infobuff, &nents);
        switch (error) {

        case VINF_SUCCESS:
            /* fallthrough */
        case VERR_NO_MORE_FILES:
            break;

        case VERR_NO_TRANSLATION:
            /* XXX ??? */
            break;

        default:
            error = RTErrConvertToErrno(error);
            goto done;
        }

        /*
         * Create the dirent_t's and save the stats for each name
         */
        for (info = infobuff; (char *) info < (char *) infobuff + numbytes; nents--) {
            /* expand buffers if we need more space */
            reclen = DIRENT64_RECLEN(strlen(info->name.String.utf8));
            if (SFFS_DIRENTS_OFF + cur_buf->sf_len + reclen > SFFS_DIRENTS_SIZE) {
                cur_buf->sf_next = kmem_alloc(SFFS_DIRENTS_SIZE, KM_SLEEP);
                if (cur_buf->sf_next == NULL) {
                    error = ENOSPC;
                    goto done;
                }
                cur_buf = cur_buf->sf_next;
                cur_buf->sf_next = NULL;
                cur_buf->sf_len = 0;
            }

            if (cur_stats->sf_num >= SFFS_STATS_LEN) {
                cur_stats->sf_next = kmem_alloc(sizeof(**stats), KM_SLEEP);
                if (cur_stats->sf_next == NULL) {
                    error = (ENOSPC);
                    goto done;
                }
                cur_stats = cur_stats->sf_next;
                cur_stats->sf_next = NULL;
                cur_stats->sf_num = 0;
            }

            /* create the dirent with the name, offset, and len */
            dirent = (dirent64_t *)
                (((char *) &cur_buf->sf_entries[0]) + cur_buf->sf_len);
            strcpy(&dirent->d_name[0], info->name.String.utf8);
            dirent->d_reclen = reclen;
            dirent->d_off = cnt;

            cur_buf->sf_len += reclen;
            ++cnt;

            /* save the stats */
            stat = &cur_stats->sf_stats[cur_stats->sf_num];
            ++cur_stats->sf_num;

            sfprov_mode_from_fmode(&stat->sf_mode, info->Info.Attr.fMode);
            stat->sf_size = info->Info.cbObject;
            sfprov_ftime_from_timespec(&stat->sf_atime, &info->Info.AccessTime);
            sfprov_ftime_from_timespec(&stat->sf_mtime, &info->Info.ModificationTime);
            sfprov_ftime_from_timespec(&stat->sf_ctime, &info->Info.ChangeTime);

            /* next info */
            size = offsetof (SHFLDIRINFO, name.String) + info->name.u16Size;
            info = (SHFLDIRINFO *) ((uintptr_t) info + size);
        }
        ASSERT(nents == 0);
        ASSERT((char *) info == (char *) infobuff + numbytes);

        if (error == VERR_NO_MORE_FILES)
            break;
    }
    error = 0;

done:
    if (error != 0) {
        while (*dirents) {
            cur_buf = (*dirents)->sf_next;
            kmem_free(*dirents, SFFS_DIRENTS_SIZE);
            *dirents = cur_buf;
        }
        while (*stats) {
            cur_stats = (*stats)->sf_next;
            kmem_free(*stats, sizeof(**stats));
            *stats = cur_stats;
        }
    }
    if (infobuff != NULL)
        kmem_free(infobuff, infobuff_alloc);
    if (mask_str != NULL)
        kmem_free(mask_str, mask_size);
    sfprov_close(fp);
    return (error);
}