source: mainline/uspace/lib/ext2/libext2_filesystem.c@ c00e729

/*
 * Copyright (c) 2011 Martin Sucha
 * 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 libext2
 * @{
 */
/**
 * @file
 */

#include "libext2.h"
#include <errno.h>
#include <libblock.h>
#include <malloc.h>

/**
 * Initialize an instance of filesystem on the device.
 * This function reads superblock from the device and
 * initializes libblock cache with appropriate logical block size.
 * 
 * @param fs                    Pointer to ext2_filesystem_t to initialize
 * @param devmap_handle Device handle of the block device
 */
int ext2_filesystem_init(ext2_filesystem_t *fs, devmap_handle_t devmap_handle)
{
        int rc;
        ext2_superblock_t *temp_superblock;
        size_t block_size;
        
        fs->device = devmap_handle;
        
        rc = block_init(fs->device, 2048);
        if (rc != EOK) {
                return rc;
        }
        
        rc = ext2_superblock_read_direct(fs->device, &temp_superblock);
        if (rc != EOK) {
                block_fini(fs->device);
                return rc;
        }
        
        block_size = ext2_superblock_get_block_size(temp_superblock);
        
        if (block_size > EXT2_MAX_BLOCK_SIZE) {
                block_fini(fs->device);
                return ENOTSUP;
        }
        
        rc = block_cache_init(devmap_handle, block_size, 0, CACHE_MODE_WT);
        if (rc != EOK) {
                block_fini(fs->device);
                return rc;
        }
        
        fs->superblock = temp_superblock;
        
        return EOK; 
}

/**
 * Finalize an instance of filesystem
 * 
 * @param fs Pointer to ext2_filesystem_t to finalize
 */
void ext2_filesystem_fini(ext2_filesystem_t *fs)
{
        free(fs->superblock);
        block_fini(fs->device);
}


/** @}
 */