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d9e90266 HP |
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> | |
d9e90266 HP |
9 | #include <linux/ctype.h> |
10 | #include <linux/capability.h> | |
11 | #include <linux/time.h> | |
12 | #include <asm/current.h> | |
13 | #include <asm/uaccess.h> | |
14 | ||
15 | #include "jfs_incore.h" | |
16 | #include "jfs_dinode.h" | |
17 | #include "jfs_inode.h" | |
18 | ||
19 | ||
20 | static struct { | |
21 | long jfs_flag; | |
22 | long ext2_flag; | |
23 | } jfs_map[] = { | |
36695673 DH |
24 | {JFS_NOATIME_FL, FS_NOATIME_FL}, |
25 | {JFS_DIRSYNC_FL, FS_DIRSYNC_FL}, | |
26 | {JFS_SYNC_FL, FS_SYNC_FL}, | |
27 | {JFS_SECRM_FL, FS_SECRM_FL}, | |
28 | {JFS_UNRM_FL, FS_UNRM_FL}, | |
29 | {JFS_APPEND_FL, FS_APPEND_FL}, | |
30 | {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL}, | |
d9e90266 HP |
31 | {0, 0}, |
32 | }; | |
33 | ||
34 | static long jfs_map_ext2(unsigned long flags, int from) | |
35 | { | |
36 | int index=0; | |
37 | long mapped=0; | |
38 | ||
39 | while (jfs_map[index].jfs_flag) { | |
40 | if (from) { | |
41 | if (jfs_map[index].ext2_flag & flags) | |
42 | mapped |= jfs_map[index].jfs_flag; | |
43 | } else { | |
44 | if (jfs_map[index].jfs_flag & flags) | |
45 | mapped |= jfs_map[index].ext2_flag; | |
46 | } | |
47 | index++; | |
48 | } | |
49 | return mapped; | |
50 | } | |
51 | ||
52 | ||
53 | int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, | |
54 | unsigned long arg) | |
55 | { | |
56 | struct jfs_inode_info *jfs_inode = JFS_IP(inode); | |
57 | unsigned int flags; | |
58 | ||
59 | switch (cmd) { | |
60 | case JFS_IOC_GETFLAGS: | |
61 | flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; | |
62 | flags = jfs_map_ext2(flags, 0); | |
63 | return put_user(flags, (int __user *) arg); | |
64 | case JFS_IOC_SETFLAGS: { | |
65 | unsigned int oldflags; | |
66 | ||
67 | if (IS_RDONLY(inode)) | |
68 | return -EROFS; | |
69 | ||
70 | if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) | |
71 | return -EACCES; | |
72 | ||
73 | if (get_user(flags, (int __user *) arg)) | |
74 | return -EFAULT; | |
75 | ||
76 | flags = jfs_map_ext2(flags, 1); | |
77 | if (!S_ISDIR(inode->i_mode)) | |
78 | flags &= ~JFS_DIRSYNC_FL; | |
79 | ||
80 | oldflags = jfs_inode->mode2; | |
81 | ||
82 | /* | |
83 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
84 | * the relevant capability. | |
85 | */ | |
86 | if ((oldflags & JFS_IMMUTABLE_FL) || | |
87 | ((flags ^ oldflags) & | |
88 | (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { | |
89 | if (!capable(CAP_LINUX_IMMUTABLE)) | |
90 | return -EPERM; | |
91 | } | |
92 | ||
93 | flags = flags & JFS_FL_USER_MODIFIABLE; | |
94 | flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; | |
95 | jfs_inode->mode2 = flags; | |
96 | ||
97 | jfs_set_inode_flags(inode); | |
98 | inode->i_ctime = CURRENT_TIME_SEC; | |
99 | mark_inode_dirty(inode); | |
100 | return 0; | |
101 | } | |
102 | default: | |
103 | return -ENOTTY; | |
104 | } | |
105 | } | |
106 |