fc89f94367842583d7dd9f9d8d93707e5bd1a50c
[sfrench/cifs-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 <linux/blkdev.h>
15 #include <asm/current.h>
16 #include <linux/uaccess.h>
17
18 #include "jfs_filsys.h"
19 #include "jfs_debug.h"
20 #include "jfs_incore.h"
21 #include "jfs_dinode.h"
22 #include "jfs_inode.h"
23 #include "jfs_dmap.h"
24 #include "jfs_discard.h"
25
26 static struct {
27         long jfs_flag;
28         long ext2_flag;
29 } jfs_map[] = {
30         {JFS_NOATIME_FL,        FS_NOATIME_FL},
31         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
32         {JFS_SYNC_FL,           FS_SYNC_FL},
33         {JFS_SECRM_FL,          FS_SECRM_FL},
34         {JFS_UNRM_FL,           FS_UNRM_FL},
35         {JFS_APPEND_FL,         FS_APPEND_FL},
36         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
37         {0, 0},
38 };
39
40 static long jfs_map_ext2(unsigned long flags, int from)
41 {
42         int index=0;
43         long mapped=0;
44
45         while (jfs_map[index].jfs_flag) {
46                 if (from) {
47                         if (jfs_map[index].ext2_flag & flags)
48                                 mapped |= jfs_map[index].jfs_flag;
49                 } else {
50                         if (jfs_map[index].jfs_flag & flags)
51                                 mapped |= jfs_map[index].ext2_flag;
52                 }
53                 index++;
54         }
55         return mapped;
56 }
57
58
59 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
60 {
61         struct inode *inode = file_inode(filp);
62         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
63         unsigned int flags;
64
65         switch (cmd) {
66         case JFS_IOC_GETFLAGS:
67                 jfs_get_inode_flags(jfs_inode);
68                 flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
69                 flags = jfs_map_ext2(flags, 0);
70                 return put_user(flags, (int __user *) arg);
71         case JFS_IOC_SETFLAGS: {
72                 unsigned int oldflags;
73                 int err;
74
75                 err = mnt_want_write_file(filp);
76                 if (err)
77                         return err;
78
79                 if (!inode_owner_or_capable(inode)) {
80                         err = -EACCES;
81                         goto setflags_out;
82                 }
83                 if (get_user(flags, (int __user *) arg)) {
84                         err = -EFAULT;
85                         goto setflags_out;
86                 }
87
88                 flags = jfs_map_ext2(flags, 1);
89                 if (!S_ISDIR(inode->i_mode))
90                         flags &= ~JFS_DIRSYNC_FL;
91
92                 /* Is it quota file? Do not allow user to mess with it */
93                 if (IS_NOQUOTA(inode)) {
94                         err = -EPERM;
95                         goto setflags_out;
96                 }
97
98                 /* Lock against other parallel changes of flags */
99                 inode_lock(inode);
100
101                 jfs_get_inode_flags(jfs_inode);
102                 oldflags = jfs_inode->mode2;
103
104                 /*
105                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
106                  * the relevant capability.
107                  */
108                 if ((oldflags & JFS_IMMUTABLE_FL) ||
109                         ((flags ^ oldflags) &
110                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
111                         if (!capable(CAP_LINUX_IMMUTABLE)) {
112                                 inode_unlock(inode);
113                                 err = -EPERM;
114                                 goto setflags_out;
115                         }
116                 }
117
118                 flags = flags & JFS_FL_USER_MODIFIABLE;
119                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
120                 jfs_inode->mode2 = flags;
121
122                 jfs_set_inode_flags(inode);
123                 inode_unlock(inode);
124                 inode->i_ctime = current_time(inode);
125                 mark_inode_dirty(inode);
126 setflags_out:
127                 mnt_drop_write_file(filp);
128                 return err;
129         }
130
131         case FITRIM:
132         {
133                 struct super_block *sb = inode->i_sb;
134                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
135                 struct fstrim_range range;
136                 s64 ret = 0;
137
138                 if (!capable(CAP_SYS_ADMIN))
139                         return -EPERM;
140
141                 if (!blk_queue_discard(q)) {
142                         jfs_warn("FITRIM not supported on device");
143                         return -EOPNOTSUPP;
144                 }
145
146                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
147                     sizeof(range)))
148                         return -EFAULT;
149
150                 range.minlen = max_t(unsigned int, range.minlen,
151                         q->limits.discard_granularity);
152
153                 ret = jfs_ioc_trim(inode, &range);
154                 if (ret < 0)
155                         return ret;
156
157                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
158                     sizeof(range)))
159                         return -EFAULT;
160
161                 return 0;
162         }
163
164         default:
165                 return -ENOTTY;
166         }
167 }
168
169 #ifdef CONFIG_COMPAT
170 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
171 {
172         /* While these ioctl numbers defined with 'long' and have different
173          * numbers than the 64bit ABI,
174          * the actual implementation only deals with ints and is compatible.
175          */
176         switch (cmd) {
177         case JFS_IOC_GETFLAGS32:
178                 cmd = JFS_IOC_GETFLAGS;
179                 break;
180         case JFS_IOC_SETFLAGS32:
181                 cmd = JFS_IOC_SETFLAGS;
182                 break;
183         }
184         return jfs_ioctl(filp, cmd, arg);
185 }
186 #endif