source: trunk/kernel/fs/sysfs/sysfs_node.c @ 10

/*
 * sysfs/sysfs_node.c - sysfs node related operations
 *
 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-kernel.
 *
 * ALMOS-kernel 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-kernel 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-kernel; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <config.h>
#include <kmem.h>
#include <string.h>
#include <kdmsg.h>
#include <vfs.h>
#include <cpu.h>

#include <sysfs.h>
#include <sysfs-private.h>

KMEM_OBJATTR_INIT(sysfs_kmem_node_init)
{
        attr->type   = KMEM_SYSFS_NODE;
        attr->name   = "KCM SysFs Node";
        attr->size   = sizeof(struct sysfs_node_s);
        attr->aligne = 0;
        attr->min    = CONFIG_SYSFS_NODE_MIN;
        attr->max    = CONFIG_SYSFS_NODE_MAX;
        attr->ctor   = NULL;
        attr->dtor   = NULL;
        return 0;
}


VFS_INIT_NODE(sysfs_init_node)
{
        register struct sysfs_node_s *node_info;
        kmem_req_t req;
  
        node_info = inode->i_pv;

        if(inode->i_pv == NULL)
        {
                req.type  = KMEM_SYSFS_NODE;
                req.size  = sizeof(*node_info);
                req.flags = AF_KERNEL;

                node_info = kmem_alloc(&req);
        }

        if(node_info == NULL)
                return ENOMEM;
  
        inode->i_pv = node_info;
        return 0;
}


VFS_RELEASE_NODE(sysfs_release_node)
{
        kmem_req_t req;

        req.type   = KMEM_SYSFS_NODE;
        req.ptr    = inode->i_pv;
        kmem_free(&req);
        inode->i_pv = NULL;
        return 0;
}


VFS_CREATE_NODE(sysfs_create_node)
{ 
        return ENOTSUPPORTED;
}


error_t sysfs_inode_create(struct vfs_dirent_s *dirent, 
                                struct vfs_inode_s *parent,
                                struct metafs_s *meta, size_t size)
{
        struct vfs_inode_s *inode;

        inode = vfs_inode_new(dirent->d_ctx);//allocate inode
        if(!inode) return ENOMEM;

        inode->i_links  = 1;
        inode->i_attr = dirent->d_attr;
        ((struct sysfs_node_s *)inode->i_pv)->node = meta;
        inode->i_size = size;
        inode->i_parent.ptr = parent;
        inode->i_parent.cid = cpu_get_cid();
        inode->i_parent.gc = parent->i_gc;
        inode->i_number = vfs_inum_new(dirent->d_ctx);
        
        vfs_icache_add(inode);

        dirent->d_inode.cid = cpu_get_cid();
        dirent->d_inode.ptr = inode;

        return 0;
}

VFS_LOOKUP_NODE(sysfs_lookup_node)
{
        register struct sysfs_node_s *parent_info;
        register struct metafs_s *meta;
        register uint_t hasChild;
        size_t size;
  
        size = 0;
        parent_info = parent->i_pv;
  
        sysfs_dmsg(1, "DEBUG: sysfs_lookup: %s, attr %x\n", dirent->d_name, dirent->d_attr);

        if((meta = metafs_lookup(parent_info->node, dirent->d_name)) == NULL)
                return VFS_NOT_FOUND;

        hasChild = metafs_hasChild(meta);

        if(hasChild && !(dirent->d_attr & VFS_DIR))
                return EISDIR;
  
        if(!(hasChild) && (dirent->d_attr & VFS_DIR))
                return ENOTDIR;

        if(hasChild)
                dirent->d_attr |= VFS_DIR;
        else
                size = SYSFS_BUFFER_SIZE;

        sysfs_inode_create(dirent, parent, meta, size);
  
        return VFS_FOUND;
}


VFS_WRITE_NODE(sysfs_write_node)
{
        return 0;
}

VFS_UNLINK_NODE(sysfs_unlink_node)
{
        return ENOTSUPPORTED;
}

const struct vfs_inode_op_s sysfs_i_op = 
{
        .init    = sysfs_init_node,
        .create  = sysfs_create_node,
        .lookup  = sysfs_lookup_node,
        .write   = sysfs_write_node,
        .release = sysfs_release_node,
        .unlink  = sysfs_unlink_node,
        .stat    = NULL,
        .delete  = NULL
};