| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext2/ioctl.c |
| 3 | * |
| 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) |
| 8 | */ |
| 9 | |
| 10 | #include "ext2.h" |
| Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 11 | #include <linux/capability.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/time.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <asm/current.h> |
| 15 | #include <asm/uaccess.h> |
| 16 | |
| 17 | |
| 18 | int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, |
| 19 | unsigned long arg) |
| 20 | { |
| 21 | struct ext2_inode_info *ei = EXT2_I(inode); |
| 22 | unsigned int flags; |
| 23 | |
| 24 | ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); |
| 25 | |
| 26 | switch (cmd) { |
| 27 | case EXT2_IOC_GETFLAGS: |
| 28 | flags = ei->i_flags & EXT2_FL_USER_VISIBLE; |
| 29 | return put_user(flags, (int __user *) arg); |
| 30 | case EXT2_IOC_SETFLAGS: { |
| 31 | unsigned int oldflags; |
| 32 | |
| 33 | if (IS_RDONLY(inode)) |
| 34 | return -EROFS; |
| 35 | |
| 36 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) |
| 37 | return -EACCES; |
| 38 | |
| 39 | if (get_user(flags, (int __user *) arg)) |
| 40 | return -EFAULT; |
| 41 | |
| 42 | if (!S_ISDIR(inode->i_mode)) |
| 43 | flags &= ~EXT2_DIRSYNC_FL; |
| 44 | |
| 45 | oldflags = ei->i_flags; |
| 46 | |
| 47 | /* |
| 48 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by |
| 49 | * the relevant capability. |
| 50 | * |
| 51 | * This test looks nicer. Thanks to Pauline Middelink |
| 52 | */ |
| 53 | if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { |
| 54 | if (!capable(CAP_LINUX_IMMUTABLE)) |
| 55 | return -EPERM; |
| 56 | } |
| 57 | |
| 58 | flags = flags & EXT2_FL_USER_MODIFIABLE; |
| 59 | flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; |
| 60 | ei->i_flags = flags; |
| 61 | |
| 62 | ext2_set_inode_flags(inode); |
| 63 | inode->i_ctime = CURRENT_TIME_SEC; |
| 64 | mark_inode_dirty(inode); |
| 65 | return 0; |
| 66 | } |
| 67 | case EXT2_IOC_GETVERSION: |
| 68 | return put_user(inode->i_generation, (int __user *) arg); |
| 69 | case EXT2_IOC_SETVERSION: |
| 70 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) |
| 71 | return -EPERM; |
| 72 | if (IS_RDONLY(inode)) |
| 73 | return -EROFS; |
| 74 | if (get_user(inode->i_generation, (int __user *) arg)) |
| 75 | return -EFAULT; |
| 76 | inode->i_ctime = CURRENT_TIME_SEC; |
| 77 | mark_inode_dirty(inode); |
| 78 | return 0; |
| 79 | default: |
| 80 | return -ENOTTY; |
| 81 | } |
| 82 | } |