device_cgroup.h

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#include <linux/fs.h>

#ifdef CONFIG_CGROUP_DEVICE
extern int __devcgroup_inode_permission(struct inode *inode, int mask);
extern int devcgroup_inode_mknod(int mode, dev_t dev);
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
{
    if (likely(!inode->i_rdev))
        return 0;
    if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
        return 0;
    return __devcgroup_inode_permission(inode, mask);
}
#else
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
{ return 0; }
static inline int devcgroup_inode_mknod(int mode, dev_t dev)
{ return 0; }
#endif