dquot: cleanup dquot drop routine
[linux-2.6.git] / fs / jfs / ioctl.c
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
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
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 (!is_owner_or_cap(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
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