Merge tag 'fbdev-v4.15' of git://github.com/bzolnier/linux
[linux-2.6-microblaze.git] / fs / jfs / ioctl.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * linux/fs/jfs/ioctl.c
4  *
5  * Copyright (C) 2006 Herbert Poetzl
6  * adapted from Remy Card's ext2/ioctl.c
7  */
8
9 #include <linux/fs.h>
10 #include <linux/ctype.h>
11 #include <linux/capability.h>
12 #include <linux/mount.h>
13 #include <linux/time.h>
14 #include <linux/sched.h>
15 #include <linux/blkdev.h>
16 #include <asm/current.h>
17 #include <linux/uaccess.h>
18
19 #include "jfs_filsys.h"
20 #include "jfs_debug.h"
21 #include "jfs_incore.h"
22 #include "jfs_dinode.h"
23 #include "jfs_inode.h"
24 #include "jfs_dmap.h"
25 #include "jfs_discard.h"
26
27 static struct {
28         long jfs_flag;
29         long ext2_flag;
30 } jfs_map[] = {
31         {JFS_NOATIME_FL,        FS_NOATIME_FL},
32         {JFS_DIRSYNC_FL,        FS_DIRSYNC_FL},
33         {JFS_SYNC_FL,           FS_SYNC_FL},
34         {JFS_SECRM_FL,          FS_SECRM_FL},
35         {JFS_UNRM_FL,           FS_UNRM_FL},
36         {JFS_APPEND_FL,         FS_APPEND_FL},
37         {JFS_IMMUTABLE_FL,      FS_IMMUTABLE_FL},
38         {0, 0},
39 };
40
41 static long jfs_map_ext2(unsigned long flags, int from)
42 {
43         int index=0;
44         long mapped=0;
45
46         while (jfs_map[index].jfs_flag) {
47                 if (from) {
48                         if (jfs_map[index].ext2_flag & flags)
49                                 mapped |= jfs_map[index].jfs_flag;
50                 } else {
51                         if (jfs_map[index].jfs_flag & flags)
52                                 mapped |= jfs_map[index].ext2_flag;
53                 }
54                 index++;
55         }
56         return mapped;
57 }
58
59
60 long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
61 {
62         struct inode *inode = file_inode(filp);
63         struct jfs_inode_info *jfs_inode = JFS_IP(inode);
64         unsigned int flags;
65
66         switch (cmd) {
67         case JFS_IOC_GETFLAGS:
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                 oldflags = jfs_inode->mode2;
102
103                 /*
104                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
105                  * the relevant capability.
106                  */
107                 if ((oldflags & JFS_IMMUTABLE_FL) ||
108                         ((flags ^ oldflags) &
109                         (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) {
110                         if (!capable(CAP_LINUX_IMMUTABLE)) {
111                                 inode_unlock(inode);
112                                 err = -EPERM;
113                                 goto setflags_out;
114                         }
115                 }
116
117                 flags = flags & JFS_FL_USER_MODIFIABLE;
118                 flags |= oldflags & ~JFS_FL_USER_MODIFIABLE;
119                 jfs_inode->mode2 = flags;
120
121                 jfs_set_inode_flags(inode);
122                 inode_unlock(inode);
123                 inode->i_ctime = current_time(inode);
124                 mark_inode_dirty(inode);
125 setflags_out:
126                 mnt_drop_write_file(filp);
127                 return err;
128         }
129
130         case FITRIM:
131         {
132                 struct super_block *sb = inode->i_sb;
133                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
134                 struct fstrim_range range;
135                 s64 ret = 0;
136
137                 if (!capable(CAP_SYS_ADMIN))
138                         return -EPERM;
139
140                 if (!blk_queue_discard(q)) {
141                         jfs_warn("FITRIM not supported on device");
142                         return -EOPNOTSUPP;
143                 }
144
145                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
146                     sizeof(range)))
147                         return -EFAULT;
148
149                 range.minlen = max_t(unsigned int, range.minlen,
150                         q->limits.discard_granularity);
151
152                 ret = jfs_ioc_trim(inode, &range);
153                 if (ret < 0)
154                         return ret;
155
156                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
157                     sizeof(range)))
158                         return -EFAULT;
159
160                 return 0;
161         }
162
163         default:
164                 return -ENOTTY;
165         }
166 }
167
168 #ifdef CONFIG_COMPAT
169 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
170 {
171         /* While these ioctl numbers defined with 'long' and have different
172          * numbers than the 64bit ABI,
173          * the actual implementation only deals with ints and is compatible.
174          */
175         switch (cmd) {
176         case JFS_IOC_GETFLAGS32:
177                 cmd = JFS_IOC_GETFLAGS;
178                 break;
179         case JFS_IOC_SETFLAGS32:
180                 cmd = JFS_IOC_SETFLAGS;
181                 break;
182         }
183         return jfs_ioctl(filp, cmd, arg);
184 }
185 #endif