Subversion Repositories HelenOS

/*

 * Copyright (c) 2008 Jakub Jermar

 * Copyright (c) 2008 Martin Decky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.

 */

/** @addtogroup fs

 * @{

 */

/**

 * @file    tmpfs_dump.c

 * @brief   Support for loading TMPFS file system dump.

 */

#include "tmpfs.h"

#include "../../vfs/vfs.h"

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <as.h>

#include <libblock.h>

#include <byteorder.h>

#define TMPFS_BLOCK_SIZE    1024

struct rdentry {

    uint8_t type;

    uint32_t len;

} __attribute__((packed));

static bool

tmpfs_restore_recursion(dev_handle_t dev, off_t *bufpos, size_t *buflen,

    off_t *pos, fs_node_t *pfn)

{

    struct rdentry entry;

    libfs_ops_t *ops = &tmpfs_libfs_ops;

    int rc;

    do {

        char *fname;

        fs_node_t *fn;

        tmpfs_node_t *nodep;

        uint32_t size;

        if (block_seqread(dev, bufpos, buflen, pos, &entry,

            sizeof(entry), TMPFS_BLOCK_SIZE) != EOK)

            return false;

        entry.len = uint32_t_le2host(entry.len);

        switch (entry.type) {

        case TMPFS_NONE:

            break;

        case TMPFS_FILE:

            fname = malloc(entry.len + 1);

            if (fname == NULL)

                return false;

            fn = ops->create(dev, L_FILE);

            if (fn == NULL) {

                free(fname);

                return false;

            }

            if (block_seqread(dev, bufpos, buflen, pos, fname,

                entry.len, TMPFS_BLOCK_SIZE) != EOK) {

                ops->destroy(fn);

                free(fname);

                return false;

            }

            fname[entry.len] = 0;

            rc = ops->link(pfn, fn, fname);

            if (rc != EOK) {

                ops->destroy(fn);

                free(fname);

                return false;

            }

            free(fname);

            if (block_seqread(dev, bufpos, buflen, pos, &size,

                sizeof(size), TMPFS_BLOCK_SIZE) != EOK)

                return false;

            size = uint32_t_le2host(size);

            nodep = TMPFS_NODE(fn);

            nodep->data = malloc(size);

            if (nodep->data == NULL)

                return false;

            nodep->size = size;

            if (block_seqread(dev, bufpos, buflen, pos, nodep->data,

                size, TMPFS_BLOCK_SIZE) != EOK)

                return false;

            break;

        case TMPFS_DIRECTORY:

            fname = malloc(entry.len + 1);

            if (fname == NULL)

                return false;

            fn = ops->create(dev, L_DIRECTORY);

            if (fn == NULL) {

                free(fname);

                return false;

            }

            if (block_seqread(dev, bufpos, buflen, pos, fname,

                entry.len, TMPFS_BLOCK_SIZE) != EOK) {

                ops->destroy(fn);

                free(fname);

                return false;

            }

            fname[entry.len] = 0;

            rc = ops->link(pfn, fn, fname);

            if (rc != EOK) {

                ops->destroy(fn);

                free(fname);

                return false;

            }

            free(fname);

            if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,

                fn))

                return false;

            break;

        default:

            return false;

        }

    } while (entry.type != TMPFS_NONE);

    return true;

}

bool tmpfs_restore(dev_handle_t dev)

{

    libfs_ops_t *ops = &tmpfs_libfs_ops;

    int rc;

    rc = block_init(dev, TMPFS_BLOCK_SIZE);

    if (rc != EOK)

        return false;

    off_t bufpos = 0;

    size_t buflen = 0;

    off_t pos = 0;

    char tag[6];

    if (block_seqread(dev, &bufpos, &buflen, &pos, tag, 5,

        TMPFS_BLOCK_SIZE) != EOK)

        goto error;

    tag[5] = 0;

    if (str_cmp(tag, "TMPFS") != 0)

        goto error;

    if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,

        ops->root_get(dev)))

        goto error;

    block_fini(dev);

    return true;

error:

    block_fini(dev);

    return false;

}

/**

 * @}

 */