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#include <linux/fileattr.h>
19
20#include "jfs_filsys.h"
21#include "jfs_debug.h"
22#include "jfs_incore.h"
23#include "jfs_dinode.h"
24#include "jfs_inode.h"
25#include "jfs_dmap.h"
26#include "jfs_discard.h"
27
28static struct {
29 long jfs_flag;
30 long ext2_flag;
31} jfs_map[] = {
32 {JFS_NOATIME_FL, FS_NOATIME_FL},
33 {JFS_DIRSYNC_FL, FS_DIRSYNC_FL},
34 {JFS_SYNC_FL, FS_SYNC_FL},
35 {JFS_SECRM_FL, FS_SECRM_FL},
36 {JFS_UNRM_FL, FS_UNRM_FL},
37 {JFS_APPEND_FL, FS_APPEND_FL},
38 {JFS_IMMUTABLE_FL, FS_IMMUTABLE_FL},
39 {0, 0},
40};
41
42static long jfs_map_ext2(unsigned long flags, int from)
43{
44 int index=0;
45 long mapped=0;
46
47 while (jfs_map[index].jfs_flag) {
48 if (from) {
49 if (jfs_map[index].ext2_flag & flags)
50 mapped |= jfs_map[index].jfs_flag;
51 } else {
52 if (jfs_map[index].jfs_flag & flags)
53 mapped |= jfs_map[index].ext2_flag;
54 }
55 index++;
56 }
57 return mapped;
58}
59
60int jfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
61{
62 struct jfs_inode_info *jfs_inode = JFS_IP(inode: d_inode(dentry));
63 unsigned int flags = jfs_inode->mode2 & JFS_FL_USER_VISIBLE;
64
65 if (d_is_special(dentry))
66 return -ENOTTY;
67
68 fileattr_fill_flags(fa, flags: jfs_map_ext2(flags, from: 0));
69
70 return 0;
71}
72
73int jfs_fileattr_set(struct mnt_idmap *idmap,
74 struct dentry *dentry, struct file_kattr *fa)
75{
76 struct inode *inode = d_inode(dentry);
77 struct jfs_inode_info *jfs_inode = JFS_IP(inode);
78 unsigned int flags;
79
80 if (d_is_special(dentry))
81 return -ENOTTY;
82
83 if (fileattr_has_fsx(fa))
84 return -EOPNOTSUPP;
85
86 flags = jfs_map_ext2(flags: fa->flags, from: 1);
87 if (!S_ISDIR(inode->i_mode))
88 flags &= ~JFS_DIRSYNC_FL;
89
90 /* Is it quota file? Do not allow user to mess with it */
91 if (IS_NOQUOTA(inode))
92 return -EPERM;
93
94 flags = flags & JFS_FL_USER_MODIFIABLE;
95 flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE;
96 jfs_inode->mode2 = flags;
97
98 jfs_set_inode_flags(inode);
99 inode_set_ctime_current(inode);
100 mark_inode_dirty(inode);
101
102 return 0;
103}
104
105long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
106{
107 struct inode *inode = file_inode(f: filp);
108
109 switch (cmd) {
110 case FITRIM:
111 {
112 struct super_block *sb = inode->i_sb;
113 struct fstrim_range range;
114 s64 ret = 0;
115
116 if (!capable(CAP_SYS_ADMIN))
117 return -EPERM;
118
119 if (!bdev_max_discard_sectors(bdev: sb->s_bdev)) {
120 jfs_warn("FITRIM not supported on device");
121 return -EOPNOTSUPP;
122 }
123
124 if (copy_from_user(to: &range, from: (struct fstrim_range __user *)arg,
125 n: sizeof(range)))
126 return -EFAULT;
127
128 range.minlen = max_t(unsigned int, range.minlen,
129 bdev_discard_granularity(sb->s_bdev));
130
131 ret = jfs_ioc_trim(ip: inode, range: &range);
132 if (ret < 0)
133 return ret;
134
135 if (copy_to_user(to: (struct fstrim_range __user *)arg, from: &range,
136 n: sizeof(range)))
137 return -EFAULT;
138
139 return 0;
140 }
141
142 default:
143 return -ENOTTY;
144 }
145}
146

source code of linux/fs/jfs/ioctl.c