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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> | |
914e2637 | 12 | #include <linux/sched.h> |
d9e90266 HP |
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[] = { | |
36695673 DH |
25 | {JFS_NOATIME_FL, FS_NOATIME_FL}, |
26 | {JFS_DIRSYNC_FL, FS_DIRSYNC_FL}, | |
27 | {JFS_SYNC_FL, FS_SYNC_FL}, | |
28 | {JFS_SECRM_FL, FS_SECRM_FL}, | |
29 | {JFS_UNRM_FL, FS_UNRM_FL}, | |
30 | {JFS_APPEND_FL, FS_APPEND_FL}, | |
31 | {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL}, | |
d9e90266 HP |
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 | ||
baab81fa | 54 | long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
d9e90266 | 55 | { |
baab81fa | 56 | struct inode *inode = filp->f_dentry->d_inode; |
d9e90266 HP |
57 | struct jfs_inode_info *jfs_inode = JFS_IP(inode); |
58 | unsigned int flags; | |
59 | ||
60 | switch (cmd) { | |
61 | case JFS_IOC_GETFLAGS: | |
3e2221c7 | 62 | jfs_get_inode_flags(jfs_inode); |
d9e90266 HP |
63 | flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE; |
64 | flags = jfs_map_ext2(flags, 0); | |
65 | return put_user(flags, (int __user *) arg); | |
66 | case JFS_IOC_SETFLAGS: { | |
67 | unsigned int oldflags; | |
68 | ||
69 | if (IS_RDONLY(inode)) | |
70 | return -EROFS; | |
71 | ||
3bd858ab | 72 | if (!is_owner_or_cap(inode)) |
d9e90266 HP |
73 | return -EACCES; |
74 | ||
75 | if (get_user(flags, (int __user *) arg)) | |
76 | return -EFAULT; | |
77 | ||
78 | flags = jfs_map_ext2(flags, 1); | |
79 | if (!S_ISDIR(inode->i_mode)) | |
80 | flags &= ~JFS_DIRSYNC_FL; | |
81 | ||
e47776a0 JK |
82 | /* Is it quota file? Do not allow user to mess with it */ |
83 | if (IS_NOQUOTA(inode)) | |
84 | return -EPERM; | |
baab81fa AK |
85 | |
86 | /* Lock against other parallel changes of flags */ | |
87 | mutex_lock(&inode->i_mutex); | |
88 | ||
3e2221c7 | 89 | jfs_get_inode_flags(jfs_inode); |
d9e90266 HP |
90 | oldflags = jfs_inode->mode2; |
91 | ||
92 | /* | |
93 | * The IMMUTABLE and APPEND_ONLY flags can only be changed by | |
94 | * the relevant capability. | |
95 | */ | |
96 | if ((oldflags & JFS_IMMUTABLE_FL) || | |
97 | ((flags ^ oldflags) & | |
98 | (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { | |
baab81fa AK |
99 | if (!capable(CAP_LINUX_IMMUTABLE)) { |
100 | mutex_unlock(&inode->i_mutex); | |
d9e90266 | 101 | return -EPERM; |
baab81fa | 102 | } |
d9e90266 HP |
103 | } |
104 | ||
105 | flags = flags & JFS_FL_USER_MODIFIABLE; | |
106 | flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; | |
107 | jfs_inode->mode2 = flags; | |
108 | ||
109 | jfs_set_inode_flags(inode); | |
baab81fa | 110 | mutex_unlock(&inode->i_mutex); |
d9e90266 HP |
111 | inode->i_ctime = CURRENT_TIME_SEC; |
112 | mark_inode_dirty(inode); | |
113 | return 0; | |
114 | } | |
115 | default: | |
116 | return -ENOTTY; | |
117 | } | |
118 | } | |
119 | ||
ef1fc2f0 AK |
120 | #ifdef CONFIG_COMPAT |
121 | long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
122 | { | |
123 | /* While these ioctl numbers defined with 'long' and have different | |
124 | * numbers than the 64bit ABI, | |
125 | * the actual implementation only deals with ints and is compatible. | |
126 | */ | |
127 | switch (cmd) { | |
128 | case JFS_IOC_GETFLAGS32: | |
129 | cmd = JFS_IOC_GETFLAGS; | |
130 | break; | |
131 | case JFS_IOC_SETFLAGS32: | |
132 | cmd = JFS_IOC_SETFLAGS; | |
133 | break; | |
134 | } | |
135 | return jfs_ioctl(filp, cmd, arg); | |
136 | } | |
137 | #endif |