| Herbert Poetzl | d9e9026 | 2006-02-22 14:14:58 -0600 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/jfs/ioctl.c |
| 3 | * |
| 4 | * Copyright (C) 2006 Herbert Poetzl |
| 5 | * adapted from Remy Card's ext2/ioctl.c |
| 6 | */ |
| 7 | |
| 8 | #include <linux/fs.h> |
| 9 | #include <linux/ext2_fs.h> |
| 10 | #include <linux/ctype.h> |
| 11 | #include <linux/capability.h> |
| 12 | #include <linux/time.h> |
| 13 | #include <asm/current.h> |
| 14 | #include <asm/uaccess.h> |
| 15 | |
| 16 | #include "jfs_incore.h" |
| 17 | #include "jfs_dinode.h" |
| 18 | #include "jfs_inode.h" |
| 19 | |
| 20 | |
| 21 | static struct { |
| 22 | long jfs_flag; |
| 23 | long ext2_flag; |
| 24 | } jfs_map[] = { |
| 25 | {JFS_NOATIME_FL, EXT2_NOATIME_FL}, |
| 26 | {JFS_DIRSYNC_FL, EXT2_DIRSYNC_FL}, |
| 27 | {JFS_SYNC_FL, EXT2_SYNC_FL}, |
| 28 | {JFS_SECRM_FL, EXT2_SECRM_FL}, |
| 29 | {JFS_UNRM_FL, EXT2_UNRM_FL}, |
| 30 | {JFS_APPEND_FL, EXT2_APPEND_FL}, |
| 31 | {JFS_IMMUTABLE_FL, EXT2_IMMUTABLE_FL}, |
| 32 | {0, 0}, |
| 33 | }; |
| 34 | |
| 35 | static long jfs_map_ext2(unsigned long flags, int from) |
| 36 | { |
| 37 | int index=0; |
| 38 | long mapped=0; |
| 39 | |
| 40 | while (jfs_map[index].jfs_flag) { |
| 41 | if (from) { |
| 42 | if (jfs_map[index].ext2_flag & flags) |
| 43 | mapped |= jfs_map[index].jfs_flag; |
| 44 | } else { |
| 45 | if (jfs_map[index].jfs_flag & flags) |
| 46 | mapped |= jfs_map[index].ext2_flag; |
| 47 | } |
| 48 | index++; |
| 49 | } |
| 50 | return mapped; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, |
| 55 | unsigned long arg) |
| 56 | { |
| 57 | struct jfs_inode_info *jfs_inode = JFS_IP(inode); |
| 58 | unsigned int flags; |
| 59 | |
| 60 | switch (cmd) { |
| 61 | case JFS_IOC_GETFLAGS: |
| 62 | flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; |
| 63 | flags = jfs_map_ext2(flags, 0); |
| 64 | return put_user(flags, (int __user *) arg); |
| 65 | case JFS_IOC_SETFLAGS: { |
| 66 | unsigned int oldflags; |
| 67 | |
| 68 | if (IS_RDONLY(inode)) |
| 69 | return -EROFS; |
| 70 | |
| 71 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) |
| 72 | return -EACCES; |
| 73 | |
| 74 | if (get_user(flags, (int __user *) arg)) |
| 75 | return -EFAULT; |
| 76 | |
| 77 | flags = jfs_map_ext2(flags, 1); |
| 78 | if (!S_ISDIR(inode->i_mode)) |
| 79 | flags &= ~JFS_DIRSYNC_FL; |
| 80 | |
| 81 | oldflags = jfs_inode->mode2; |
| 82 | |
| 83 | /* |
| 84 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by |
| 85 | * the relevant capability. |
| 86 | */ |
| 87 | if ((oldflags & JFS_IMMUTABLE_FL) || |
| 88 | ((flags ^ oldflags) & |
| 89 | (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { |
| 90 | if (!capable(CAP_LINUX_IMMUTABLE)) |
| 91 | return -EPERM; |
| 92 | } |
| 93 | |
| 94 | flags = flags & JFS_FL_USER_MODIFIABLE; |
| 95 | flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; |
| 96 | jfs_inode->mode2 = flags; |
| 97 | |
| 98 | jfs_set_inode_flags(inode); |
| 99 | inode->i_ctime = CURRENT_TIME_SEC; |
| 100 | mark_inode_dirty(inode); |
| 101 | return 0; |
| 102 | } |
| 103 | default: |
| 104 | return -ENOTTY; |
| 105 | } |
| 106 | } |
| 107 | |