2 * linux/fs/ext2/ioctl.c
4 * Copyright (C) 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 #include <linux/ext2_fs.h>
12 #include <linux/sched.h>
13 #include <asm/uaccess.h>
16 int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
21 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
24 case EXT2_IOC_GETFLAGS:
25 flags = inode->u.ext2_i.i_flags & EXT2_FL_USER_VISIBLE;
26 return put_user(flags, (int *) arg);
27 case EXT2_IOC_SETFLAGS: {
28 unsigned int oldflags;
33 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
36 if (get_user(flags, (int *) arg))
39 oldflags = inode->u.ext2_i.i_flags;
42 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
43 * the relevant capability.
45 * This test looks nicer. Thanks to Pauline Middelink
47 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
48 if (!capable(CAP_LINUX_IMMUTABLE))
52 flags = flags & EXT2_FL_USER_MODIFIABLE;
53 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
54 inode->u.ext2_i.i_flags = flags;
56 ext2_set_inode_flags(inode);
57 inode->i_ctime = CURRENT_TIME;
58 mark_inode_dirty(inode);
61 case EXT2_IOC_GETVERSION:
62 return put_user(inode->i_generation, (int *) arg);
63 case EXT2_IOC_SETVERSION:
64 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
68 if (get_user(inode->i_generation, (int *) arg))
70 inode->i_ctime = CURRENT_TIME;
71 mark_inode_dirty(inode);