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/*

 * linux/fs/ext2/ioctl.c

 *

 * Copyright (C) 1993, 1994, 1995

 * Remy Card (card@masi.ibp.fr)

 * Laboratoire MASI - Institut Blaise Pascal

 * Universite Pierre et Marie Curie (Paris VI)

 */

#include <linux/fs.h>

#include <linux/ext2_fs.h>

#include <linux/sched.h>

#include <asm/uaccess.h>

int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,

                unsigned long arg)

{

        unsigned int flags;

        ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);

        switch (cmd) {

        case EXT2_IOC_GETFLAGS:

                flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE;

                return put_user(flags, (int *) arg);

        case EXT2_IOC_SETFLAGS: {

                unsigned int oldflags;

                if (IS_RDONLY(inode))

                        return -EROFS;

                if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))

                        return -EACCES;

                if (get_user(flags, (int *) arg))

                        return -EFAULT;

                oldflags = inode->u.ext2_i.i_flags;

                /*

                 * The IMMUTABLE and APPEND_ONLY flags can only be changed by

                 * the relevant capability.

                 *

                 * This test looks nicer. Thanks to Pauline Middelink

                 */

                if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {

                        if (!capable(CAP_LINUX_IMMUTABLE))

                                return -EPERM;

                }

                flags = flags & EXT2_FL_USER_MODIFIABLE;

                flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;

                inode->u.ext2_i.i_flags = flags;

                ext2_set_inode_flags(inode);

                inode->i_ctime = CURRENT_TIME;

                mark_inode_dirty(inode);

                return 0;

        }

        case EXT2_IOC_GETVERSION:

                return put_user(inode->i_generation, (int *) arg);

        case EXT2_IOC_SETVERSION:

                if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))

                        return -EPERM;

                if (IS_RDONLY(inode))

                        return -EROFS;

                if (get_user(inode->i_generation, (int *) arg))

                        return -EFAULT;

                inode->i_ctime = CURRENT_TIME;

                mark_inode_dirty(inode);

                return 0;

        default:

                return -ENOTTY;

        }

}