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
jfs_map_ext2(unsigned long flags,int from)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
jfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)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_map_ext2(jfs_inode->mode2 & JFS_FL_USER_VISIBLE,
102 0);
103 err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
104 if (err) {
105 inode_unlock(inode);
106 goto setflags_out;
107 }
108
109 flags = flags & JFS_FL_USER_MODIFIABLE;
110 flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
111 jfs_inode->mode2 = flags;
112
113 jfs_set_inode_flags(inode);
114 inode_unlock(inode);
115 inode->i_ctime = current_time(inode);
116 mark_inode_dirty(inode);
117 setflags_out:
118 mnt_drop_write_file(filp);
119 return err;
120 }
121
122 case FITRIM:
123 {
124 struct super_block *sb = inode->i_sb;
125 struct request_queue *q = bdev_get_queue(sb->s_bdev);
126 struct fstrim_range range;
127 s64 ret = 0;
128
129 if (!capable(CAP_SYS_ADMIN))
130 return -EPERM;
131
132 if (!blk_queue_discard(q)) {
133 jfs_warn("FITRIM not supported on device");
134 return -EOPNOTSUPP;
135 }
136
137 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
138 sizeof(range)))
139 return -EFAULT;
140
141 range.minlen = max_t(unsigned int, range.minlen,
142 q->limits.discard_granularity);
143
144 ret = jfs_ioc_trim(inode, &range);
145 if (ret < 0)
146 return ret;
147
148 if (copy_to_user((struct fstrim_range __user *)arg, &range,
149 sizeof(range)))
150 return -EFAULT;
151
152 return 0;
153 }
154
155 default:
156 return -ENOTTY;
157 }
158 }
159
160 #ifdef CONFIG_COMPAT
jfs_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)161 long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
162 {
163 /* While these ioctl numbers defined with 'long' and have different
164 * numbers than the 64bit ABI,
165 * the actual implementation only deals with ints and is compatible.
166 */
167 switch (cmd) {
168 case JFS_IOC_GETFLAGS32:
169 cmd = JFS_IOC_GETFLAGS;
170 break;
171 case JFS_IOC_SETFLAGS32:
172 cmd = JFS_IOC_SETFLAGS;
173 break;
174 }
175 return jfs_ioctl(filp, cmd, arg);
176 }
177 #endif
178
