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_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
jfs_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)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
186