source: trunk/kernel/vfs/ramfs.c @ 27

/*
 * ramfs.c  RAMFS file system API implementation.
 *
 * Authors   Mohamed Lamine Karaoui (2014,2015)
 *           Alain Greiner (2016,2017)
 *
 * Copyright (c) UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-MKH.
 *
 * ALMOS-MKH is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */


#include <hal_types.h>
#include <hal_special.h>
#include <printk.h>
#include <kmem.h>
#include <vfs.h>
#include <ramfs.h>





///////////////////////////////////////////////////////////////////////////////////////
//             The following functions are called by the VFS. 
///////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////
error_t ramfs_mount( xptr_t   parent_inode_xp,
                     char   * ramfs_root_name )
{
    xptr_t        root_inode_xp;   // unused                      
 
    // create VFS dentry and VFS inode for RAMFS root directory
    return  vfs_add_child_in_parent( INODE_TYPE_DIR,
                                     FS_TYPE_RAMFS,
                                     parent_inode_xp,
                                     ramfs_root_name,
                                     &root_inode_xp );
}


////////////////////////////////////////////
error_t ramfs_ctx_init( vfs_ctx_t * vfs_ctx,
                        xptr_t      root_inode_xp )

{
    vfs_ctx->type    = FS_TYPE_RAMFS;
    vfs_ctx->attr    = 0;                // not READ_ONLY / not SYNC
    vfs_ctx->count   = 0;                // unused for RAMFS
    vfs_ctx->blksize = 512;              // unused for RAMFS
    vfs_ctx->root_xp = root_inode_xp;
    vfs_ctx->extend  = NULL;             // unused for DEVFS

    spinlock_init( &vfs_ctx->lock );

    bitmap_init( vfs_ctx->bitmap , CONFIG_VFS_MAX_INODES );

    return 0;
}