solaris/SharedFolders/vboxfs_prov.c

	vboxfs_prov.c revision 9a61875b0e596312066a308db1b97d96f7523937
/** @file
 * VirtualBox File System for Solaris Guests, provider implementation.
 */

/*
 * Copyright (C) 2008 Sun Microsystems, Inc.
 *
 * 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.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 USA or visit http://www.sun.com if you need
 * additional information or have any questions.
 */
/*
 * 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 "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.
     */
    str = sfprov_string(path, &size);
    parms.Handle = 0;
    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)) {
        kmem_free(str, size);
        return (EINVAL);
    }
    if (parms.Handle == SHFL_HANDLE_NIL) {
        if (parms.Result == SHFL_NO_RESULT ||
            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 (EINVAL);
        }
        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;
    sfp_file_t *newfp;

    /*
     * 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)
 */
int
sfprov_get_mode(sfp_mount_t *mnt, char *path, mode_t *mode)
{
    int rc;
    RTFSOBJINFO info;
    mode_t m = 0;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    if (RTFS_IS_DIRECTORY(info.Attr.fMode))
        m |= S_IFDIR;
    else if (RTFS_IS_FILE(info.Attr.fMode))
        m |= S_IFREG;
    else if (RTFS_IS_FIFO(info.Attr.fMode))
        m |= S_IFDIR;
    else if (RTFS_IS_DEV_CHAR(info.Attr.fMode))
        m |= S_IFCHR;
    else if (RTFS_IS_DEV_BLOCK(info.Attr.fMode))
        m |= S_IFBLK;
    else if (RTFS_IS_SYMLINK(info.Attr.fMode))
        m |= S_IFLNK;
    else if (RTFS_IS_SOCKET(info.Attr.fMode))
        m |= S_IFSOCK;

    if (info.Attr.fMode & RTFS_UNIX_IRUSR)
        m |= S_IRUSR;
    if (info.Attr.fMode & RTFS_UNIX_IWUSR)
        m |= S_IWUSR;
    if (info.Attr.fMode & RTFS_UNIX_IXUSR)
        m |= S_IXUSR;
    if (info.Attr.fMode & RTFS_UNIX_IRGRP)
        m |= S_IRGRP;
    if (info.Attr.fMode & RTFS_UNIX_IWGRP)
        m |= S_IWGRP;
    if (info.Attr.fMode & RTFS_UNIX_IXGRP)
        m |= S_IXGRP;
    if (info.Attr.fMode & RTFS_UNIX_IROTH)
        m |= S_IROTH;
    if (info.Attr.fMode & RTFS_UNIX_IWOTH)
        m |= S_IWOTH;
    if (info.Attr.fMode & RTFS_UNIX_IXOTH)
        m |= S_IXOTH;
    *mode = m;
    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);
}

int
sfprov_get_atime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;
    uint64_t nanosec;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    nanosec = RTTimeSpecGetNano(&info.AccessTime);
    time->tv_sec = nanosec / 1000000000;
    time->tv_nsec = nanosec % 1000000000;
    return (0);
}

int
sfprov_get_mtime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;
    uint64_t nanosec;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    nanosec = RTTimeSpecGetNano(&info.ModificationTime);
    time->tv_sec = nanosec / 1000000000;
    time->tv_nsec = nanosec % 1000000000;
    return (0);
}

int
sfprov_get_ctime(sfp_mount_t *mnt, char *path, timestruc_t *time)
{
    int rc;
    RTFSOBJINFO info;
    uint64_t nanosec;

    rc = sfprov_getinfo(mnt, path, &info);
    if (rc)
        return (rc);
    nanosec = RTTimeSpecGetNano(&info.ChangeTime);
    time->tv_sec = nanosec / 1000000000;
    time->tv_nsec = nanosec % 1000000000;
    return (0);
}

/*
 * 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, buffer[0] is the start of an array of "char *"
 * pointers to the filenames. The array ends with a NULL pointer.
 * The remaining storage in buffer after that NULL pointer is where the
 * filename strings actually are.
 *
 * On input nents is the max number of filenames the requestor can handle.
 * On output nents is the number of entries at buff[0]
 *
 * The caller is responsible for freeing the returned buffer.
 */
int
sfprov_readdir(
    sfp_mount_t *mnt,
    char *path,
    void **buffer,
    size_t *buffersize,
    uint32_t *nents)
{
    int error;
    char *cp;
    int len;
    SHFLSTRING *mask_str = NULL;    /* must be path with "/*" appended */
    int mask_size;
    sfp_file_t *fp;
    void *buff_start = NULL;
    char **curr_b;
    char *buff_end;
    size_t buff_size;
    static char infobuff[2 * MAXNAMELEN];   /* not on stack!! */
    SHFLDIRINFO *info = (SHFLDIRINFO *)&infobuff;
    uint32_t numbytes = sizeof (infobuff);
    uint32_t justone;
    uint32_t cnt;
    char **name_ptrs;

    *buffer = NULL;
    *buffersize = 0;
    if (*nents == 0)
        return (EINVAL);
    error = sfprov_open(mnt, path, &fp);
    if (error != 0)
        return (ENOENT);

    /*
     * 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);
    strcpy(cp, path);
    strcat(cp, "/*");
    mask_str = sfprov_string(cp, &mask_size);
    kmem_free(cp, len);

    /*
     * Allocate the buffer to use for return values. Each entry
     * in the buffer will have a pointer and the string itself.
     * The pointers go in the front of the buffer, the strings
     * at the end.
     */
    buff_size = *nents * (sizeof(char *) + MAXNAMELEN);
    name_ptrs = buff_start = kmem_alloc(buff_size, KM_SLEEP);
    cp = (char *)buff_start + buff_size;

    /*
     * Now loop using vboxCallDirInfo to get one file name at a time
     */
    cnt = 0;
    for (;;) {
        justone = 1;
        numbytes = sizeof (infobuff);
        error = vboxCallDirInfo(&vbox_client, &fp->map, fp->handle,
            mask_str, SHFL_LIST_RETURN_ONE, cnt, &numbytes, info,
            &justone);
        if (error == VERR_NO_MORE_FILES) {
            break;
        }
        if (error == VERR_NO_TRANSLATION) {
            continue;   /* ?? just skip this one */
        }
        if (error != VINF_SUCCESS || justone != 1) {
            error = EINVAL;
            goto done;
        }

        /*
         * Put this name in the buffer, stop if we run out of room.
         */
        cp -= strlen(info->name.String.utf8) + 1;
        if (cp < (char *)(&name_ptrs[cnt + 2]))
            break;
        strcpy(cp, info->name.String.utf8);
        name_ptrs[cnt] = cp;
        ++cnt;
    }
    error = 0;
    name_ptrs[cnt] = NULL;
    *nents = cnt;
    *buffer = buff_start;
    *buffersize = buff_size;
done:
    if (error != 0)
        kmem_free(buff_start, buff_size);
    kmem_free(mask_str, mask_size);
    sfprov_close(fp);
    return (error);
}