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/ctype.h>
10 #include <linux/capability.h>
11 #include <linux/mount.h>
12 #include <linux/time.h>
13 #include <linux/sched.h>
14 #include <asm/current.h>
15 #include <asm/uaccess.h>
16
17 #include "jfs_incore.h"
18 #include "jfs_dinode.h"
19 #include "jfs_inode.h"
20
21
22 static struct {
23 long jfs_flag;
24 long ext2_flag;
25 } jfs_map[] = {
26 {JFS_NOATIME_FL, FS_NOATIME_FL},
27 {JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
28 {JFS_SYNC_FL, FS_SYNC_FL},
29 {JFS_SECRM_FL, FS_SECRM_FL},
30 {JFS_UNRM_FL, FS_UNRM_FL},
31 {JFS_APPEND_FL, FS_APPEND_FL},
32 {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
33 {0, 0},
34 };
35
jfs_map_ext2(unsigned long flags,int from)36 static long jfs_map_ext2(unsigned long flags, int from)
37 {
38 int index=0;
39 long mapped=0;
40
41 while (jfs_map[index].jfs_flag) {
42 if (from) {
43 if (jfs_map[index].ext2_flag & flags)
44 mapped |= jfs_map[index].jfs_flag;
45 } else {
46 if (jfs_map[index].jfs_flag & flags)
47 mapped |= jfs_map[index].ext2_flag;
48 }
49 index++;
50 }
51 return mapped;
52 }
53
54
jfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)55 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
56 {
57 struct inode *inode = filp->f_dentry->d_inode;
58 struct jfs_inode_info *jfs_inode = JFS_IP(inode);
59 unsigned int flags;
60
61 switch (cmd) {
62 case JFS_IOC_GETFLAGS:
63 jfs_get_inode_flags(jfs_inode);
64 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
65 flags = jfs_map_ext2(flags, 0);
66 return put_user(flags, (int __user *) arg);
67 case JFS_IOC_SETFLAGS: {
68 unsigned int oldflags;
69 int err;
70
71 err = mnt_want_write(filp->f_path.mnt);
72 if (err)
73 return err;
74
75 if (!inode_owner_or_capable(inode)) {
76 err = -EACCES;
77 goto setflags_out;
78 }
79 if (get_user(flags, (int __user *) arg)) {
80 err = -EFAULT;
81 goto setflags_out;
82 }
83
84 flags = jfs_map_ext2(flags, 1);
85 if (!S_ISDIR(inode->i_mode))
86 flags &= ~JFS_DIRSYNC_FL;
87
88 /* Is it quota file? Do not allow user to mess with it */
89 if (IS_NOQUOTA(inode)) {
90 err = -EPERM;
91 goto setflags_out;
92 }
93
94 /* Lock against other parallel changes of flags */
95 mutex_lock(&inode->i_mutex);
96
97 jfs_get_inode_flags(jfs_inode);
98 oldflags = jfs_inode->mode2;
99
100 /*
101 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
102 * the relevant capability.
103 */
104 if ((oldflags & JFS_IMMUTABLE_FL) ||
105 ((flags ^ oldflags) &
106 (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
107 if (!capable(CAP_LINUX_IMMUTABLE)) {
108 mutex_unlock(&inode->i_mutex);
109 err = -EPERM;
110 goto setflags_out;
111 }
112 }
113
114 flags = flags & JFS_FL_USER_MODIFIABLE;
115 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
116 jfs_inode->mode2 = flags;
117
118 jfs_set_inode_flags(inode);
119 mutex_unlock(&inode->i_mutex);
120 inode->i_ctime = CURRENT_TIME_SEC;
121 mark_inode_dirty(inode);
122 setflags_out:
123 mnt_drop_write(filp->f_path.mnt);
124 return err;
125 }
126 default:
127 return -ENOTTY;
128 }
129 }
130
131 #ifdef CONFIG_COMPAT
jfs_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)132 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
133 {
134 /* While these ioctl numbers defined with 'long' and have different
135 * numbers than the 64bit ABI,
136 * the actual implementation only deals with ints and is compatible.
137 */
138 switch (cmd) {
139 case JFS_IOC_GETFLAGS32:
140 cmd = JFS_IOC_GETFLAGS;
141 break;
142 case JFS_IOC_SETFLAGS32:
143 cmd = JFS_IOC_SETFLAGS;
144 break;
145 }
146 return jfs_ioctl(filp, cmd, arg);
147 }
148 #endif
149