source: mainline/uspace/lib/ext4/libext4_inode.h@ 9c0c0e1

/*
 * Copyright (c) 2011 Frantisek Princ
 * 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 libext4
 * @{
 */ 

#ifndef LIBEXT4_LIBEXT4_INODE_H_
#define LIBEXT4_LIBEXT4_INODE_H_

#include <libblock.h>
#include <sys/types.h>

#define EXT4_DIRECT_BLOCK_COUNT         12
#define EXT4_INDIRECT_BLOCK             EXT4_DIRECT_BLOCK_COUNT
#define EXT4_DOUBLE_INDIRECT_BLOCK      (EXT4_INDIRECT_BLOCK + 1)
#define EXT4_TRIPPLE_INDIRECT_BLOCK     (EXT4_DOUBLE_INDIRECT_BLOCK + 1)
#define EXT4_INODE_BLOCKS                       (EXT4_TRIPPLE_INDIRECT_BLOCK + 1)

/*
 * Structure of an inode on the disk
 */
typedef struct ext4_inode {
        uint16_t mode; // File mode
        uint16_t uid; // Low 16 bits of owner uid
        uint32_t size_lo; // Size in bytes

        // TODO Used in HelenOS ???
        uint32_t atime; // Access time
        uint32_t ctime; // Inode change time
        uint32_t mtime; // Modification time
        uint32_t dtime; // Deletion time

        uint16_t gid; // Low 16 bits of group id
        uint16_t links_count; // Links count
        uint32_t blocks_lo; // Blocks count
        uint32_t flags; // File flags
        uint32_t unused_osd1; // OS dependent - not used in HelenOS
    uint32_t blocks[EXT4_INODE_BLOCKS]; // Pointers to blocks
    uint32_t generation; // File version (for NFS)
    uint32_t file_acl_lo; // File ACL
    uint32_t size_hi;
    uint32_t obso_faddr; // Obsoleted fragment address
    uint32_t unused_osd2[3]; // OS dependent - not used in HelenOS
    uint16_t extra_isize;
    uint16_t pad1;
    uint32_t ctime_extra; // Extra change time (nsec << 2 | epoch)
    uint32_t mtime_extra; // Extra Modification time (nsec << 2 | epoch)
    uint32_t atime_extra; // Extra Access time (nsec << 2 | epoch)
    uint32_t crtime; // File creation time
    uint32_t crtime_extra; // Extra file creation time (nsec << 2 | epoch)
    uint32_t version_hi;   // High 32 bits for 64-bit version
} __attribute__ ((packed)) ext4_inode_t;


#define EXT4_INODE_ROOT_INDEX   2

typedef struct ext4_inode_ref {
        block_t *block; // Reference to a block containing this inode
        ext4_inode_t *inode;
        uint32_t index; // Index number of this inode
} ext4_inode_ref_t;

extern uint16_t ext4_inode_get_usage_count(ext4_inode_t *);

#endif

/**
 * @}
 */