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1.鍐呮牳鍚姩璋冪敤start_kernel鍑芥暟榪涜鍒濆鍖栥€?

asmlinkage void __init start_kernel(void) //init\Main.c:528
{
    buffer_init();
    key_init();
    security_init();
    vfs_caches_init(totalram_pages);//678琛岋紝vfs鍒濆鍖?/span>
    signals_init();
}

2.start_kernel璋冪敤vfs_caches_init瀵箆fs榪涜鍒濆鍖栥€?br>

//fs\Dcach.c:2354琛?/span>
void __init vfs_caches_init(unsigned long mempages)
{
    .......
    dcache_init();
    inode_init();
    files_init(mempages);
    mnt_init(); //mnt鍒濆鍖?/span>
    bdev_cache_init();
    chrdev_init();
}

3.鍦╲fs_caches_init璋冪敤fs\namespace.c 2321琛岀殑mnt_init鍑芥暟

void __init mnt_init(void)
{

init_rootfs(); //鍒濆鍖杛ootfs鏂囦歡緋葷粺
init_mount_tree(); //鍒濆鍖栧姞杞芥爲
}

4. fs\ramfs絎?08琛岀殑init_rootfs鍑芥暟鍒濆鍖杛ootfs鏂囦歡緋葷粺

int __init init_rootfs(void)
{
    int err;

    err = bdi_init(&ramfs_backing_dev_info);
    if (err)
        return err;

    err = register_filesystem(&rootfs_fs_type);//娉ㄥ唽rootfs鏂囦歡緋葷粺
    if (err)
        bdi_destroy(&ramfs_backing_dev_info);

    return err;
}

rootfs鏂囦歡緋葷粺淇℃伅fs\ramfs絎?89琛?

static struct file_system_type rootfs_fs_type = {
    .name        = "rootfs",
    .get_sb        = rootfs_get_sb,
    .kill_sb    = kill_litter_super,
};

5.璋冪敤register_filesystem鍑芥暟灝唕ootfs娉ㄥ唽鍒?span style="font-weight: bold; color: #ff0000; font-family: 榛戜綋;">file_systems鏂囦歡緋葷粺涓€?br>

//fs\Filesystem.c絎?9琛屻€?br>int register_filesystem(struct file_system_type * fs)
{
    int res = 0;
    struct file_system_type ** p;

    BUG_ON(strchr(fs->name, '.'));
    if (fs->next)
        return -EBUSY;
    INIT_LIST_HEAD(&fs->fs_supers);
    write_lock(&file_systems_lock);
    p = find_filesystem(fs->name, strlen(fs->name));//鏌ユ壘鍒版枃浠剁郴緇熷姞杞戒綅緗?br>    if (*p)
        res = -EBUSY;
    else
        *p = fs;
    write_unlock(&file_systems_lock);
    return res;
}

file_systems鍙橀噺鏄墍鏈夋枃浠剁郴緇熼摼琛ㄧ殑澶存寚閽堛€傞€氳繃浠ヤ笂榪囩▼rootfs_fs_type灝卞姞鍏ュ埌浜唂ile_systems閾捐〃澶寸殑file_system_type綾誨瀷鐨勯摼琛ㄤ腑銆傚彲浠ラ€氳繃file_systems鎸囬拡閬嶅巻榪欎釜閾捐〃錛屽緱鍒扮壒瀹氱殑鏂囦歡緋葷粺file_system_type 鎸囬拡銆?br>

bujiwu 2010-07-04 16:58 鍙戣〃璇勮

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