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1/*
2 * linux/fs/ext2/ioctl.c
3 *
4 * Copyright (C) 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include "ext2.h"
11#include <linux/capability.h>
12#include <linux/time.h>
13#include <linux/sched.h>
14#include <linux/compat.h>
15#include <linux/mount.h>
16#include <asm/current.h>
17#include <asm/uaccess.h>
18
19
20long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
21{
22 struct inode *inode = file_inode(filp);
23 struct ext2_inode_info *ei = EXT2_I(inode);
24 unsigned int flags;
25 unsigned short rsv_window_size;
26 int ret;
27
28 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
29
30 switch (cmd) {
31 case EXT2_IOC_GETFLAGS:
32 ext2_get_inode_flags(ei);
33 flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
34 return put_user(flags, (int __user *) arg);
35 case EXT2_IOC_SETFLAGS: {
36 unsigned int oldflags;
37
38 ret = mnt_want_write_file(filp);
39 if (ret)
40 return ret;
41
42 if (!inode_owner_or_capable(inode)) {
43 ret = -EACCES;
44 goto setflags_out;
45 }
46
47 if (get_user(flags, (int __user *) arg)) {
48 ret = -EFAULT;
49 goto setflags_out;
50 }
51
52 flags = ext2_mask_flags(inode->i_mode, flags);
53
54 inode_lock(inode);
55 /* Is it quota file? Do not allow user to mess with it */
56 if (IS_NOQUOTA(inode)) {
57 inode_unlock(inode);
58 ret = -EPERM;
59 goto setflags_out;
60 }
61 oldflags = ei->i_flags;
62
63 /*
64 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
65 * the relevant capability.
66 *
67 * This test looks nicer. Thanks to Pauline Middelink
68 */
69 if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
70 if (!capable(CAP_LINUX_IMMUTABLE)) {
71 inode_unlock(inode);
72 ret = -EPERM;
73 goto setflags_out;
74 }
75 }
76
77 flags = flags & EXT2_FL_USER_MODIFIABLE;
78 flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
79 ei->i_flags = flags;
80
81 ext2_set_inode_flags(inode);
82 inode->i_ctime = CURRENT_TIME_SEC;
83 inode_unlock(inode);
84
85 mark_inode_dirty(inode);
86setflags_out:
87 mnt_drop_write_file(filp);
88 return ret;
89 }
90 case EXT2_IOC_GETVERSION:
91 return put_user(inode->i_generation, (int __user *) arg);
92 case EXT2_IOC_SETVERSION: {
93 __u32 generation;
94
95 if (!inode_owner_or_capable(inode))
96 return -EPERM;
97 ret = mnt_want_write_file(filp);
98 if (ret)
99 return ret;
100 if (get_user(generation, (int __user *) arg)) {
101 ret = -EFAULT;
102 goto setversion_out;
103 }
104
105 inode_lock(inode);
106 inode->i_ctime = CURRENT_TIME_SEC;
107 inode->i_generation = generation;
108 inode_unlock(inode);
109
110 mark_inode_dirty(inode);
111setversion_out:
112 mnt_drop_write_file(filp);
113 return ret;
114 }
115 case EXT2_IOC_GETRSVSZ:
116 if (test_opt(inode->i_sb, RESERVATION)
117 && S_ISREG(inode->i_mode)
118 && ei->i_block_alloc_info) {
119 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
120 return put_user(rsv_window_size, (int __user *)arg);
121 }
122 return -ENOTTY;
123 case EXT2_IOC_SETRSVSZ: {
124
125 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
126 return -ENOTTY;
127
128 if (!inode_owner_or_capable(inode))
129 return -EACCES;
130
131 if (get_user(rsv_window_size, (int __user *)arg))
132 return -EFAULT;
133
134 ret = mnt_want_write_file(filp);
135 if (ret)
136 return ret;
137
138 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
139 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
140
141 /*
142 * need to allocate reservation structure for this inode
143 * before set the window size
144 */
145 /*
146 * XXX What lock should protect the rsv_goal_size?
147 * Accessed in ext2_get_block only. ext3 uses i_truncate.
148 */
149 mutex_lock(&ei->truncate_mutex);
150 if (!ei->i_block_alloc_info)
151 ext2_init_block_alloc_info(inode);
152
153 if (ei->i_block_alloc_info){
154 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
155 rsv->rsv_goal_size = rsv_window_size;
156 }
157 mutex_unlock(&ei->truncate_mutex);
158 mnt_drop_write_file(filp);
159 return 0;
160 }
161 default:
162 return -ENOTTY;
163 }
164}
165
166#ifdef CONFIG_COMPAT
167long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
168{
169 /* These are just misnamed, they actually get/put from/to user an int */
170 switch (cmd) {
171 case EXT2_IOC32_GETFLAGS:
172 cmd = EXT2_IOC_GETFLAGS;
173 break;
174 case EXT2_IOC32_SETFLAGS:
175 cmd = EXT2_IOC_SETFLAGS;
176 break;
177 case EXT2_IOC32_GETVERSION:
178 cmd = EXT2_IOC_GETVERSION;
179 break;
180 case EXT2_IOC32_SETVERSION:
181 cmd = EXT2_IOC_SETVERSION;
182 break;
183 default:
184 return -ENOIOCTLCMD;
185 }
186 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
187}
188#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext2/ioctl.c
4 *
5 * Copyright (C) 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 */
10
11#include "ext2.h"
12#include <linux/capability.h>
13#include <linux/time.h>
14#include <linux/sched.h>
15#include <linux/compat.h>
16#include <linux/mount.h>
17#include <asm/current.h>
18#include <linux/uaccess.h>
19#include <linux/fileattr.h>
20
21int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
22{
23 struct ext2_inode_info *ei = EXT2_I(d_inode(dentry));
24
25 fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE);
26
27 return 0;
28}
29
30int ext2_fileattr_set(struct mnt_idmap *idmap,
31 struct dentry *dentry, struct fileattr *fa)
32{
33 struct inode *inode = d_inode(dentry);
34 struct ext2_inode_info *ei = EXT2_I(inode);
35
36 if (fileattr_has_fsx(fa))
37 return -EOPNOTSUPP;
38
39 /* Is it quota file? Do not allow user to mess with it */
40 if (IS_NOQUOTA(inode))
41 return -EPERM;
42
43 ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) |
44 (fa->flags & EXT2_FL_USER_MODIFIABLE);
45
46 ext2_set_inode_flags(inode);
47 inode_set_ctime_current(inode);
48 mark_inode_dirty(inode);
49
50 return 0;
51}
52
53
54long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
55{
56 struct inode *inode = file_inode(filp);
57 struct ext2_inode_info *ei = EXT2_I(inode);
58 unsigned short rsv_window_size;
59 int ret;
60
61 ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
62
63 switch (cmd) {
64 case EXT2_IOC_GETVERSION:
65 return put_user(inode->i_generation, (int __user *) arg);
66 case EXT2_IOC_SETVERSION: {
67 __u32 generation;
68
69 if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
70 return -EPERM;
71 ret = mnt_want_write_file(filp);
72 if (ret)
73 return ret;
74 if (get_user(generation, (int __user *) arg)) {
75 ret = -EFAULT;
76 goto setversion_out;
77 }
78
79 inode_lock(inode);
80 inode_set_ctime_current(inode);
81 inode->i_generation = generation;
82 inode_unlock(inode);
83
84 mark_inode_dirty(inode);
85setversion_out:
86 mnt_drop_write_file(filp);
87 return ret;
88 }
89 case EXT2_IOC_GETRSVSZ:
90 if (test_opt(inode->i_sb, RESERVATION)
91 && S_ISREG(inode->i_mode)
92 && ei->i_block_alloc_info) {
93 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
94 return put_user(rsv_window_size, (int __user *)arg);
95 }
96 return -ENOTTY;
97 case EXT2_IOC_SETRSVSZ: {
98
99 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
100 return -ENOTTY;
101
102 if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
103 return -EACCES;
104
105 if (get_user(rsv_window_size, (int __user *)arg))
106 return -EFAULT;
107
108 ret = mnt_want_write_file(filp);
109 if (ret)
110 return ret;
111
112 if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
113 rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;
114
115 /*
116 * need to allocate reservation structure for this inode
117 * before set the window size
118 */
119 /*
120 * XXX What lock should protect the rsv_goal_size?
121 * Accessed in ext2_get_block only. ext3 uses i_truncate.
122 */
123 mutex_lock(&ei->truncate_mutex);
124 if (!ei->i_block_alloc_info)
125 ext2_init_block_alloc_info(inode);
126
127 if (ei->i_block_alloc_info){
128 struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
129 rsv->rsv_goal_size = rsv_window_size;
130 } else {
131 ret = -ENOMEM;
132 }
133
134 mutex_unlock(&ei->truncate_mutex);
135 mnt_drop_write_file(filp);
136 return ret;
137 }
138 default:
139 return -ENOTTY;
140 }
141}
142
143#ifdef CONFIG_COMPAT
144long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
145{
146 /* These are just misnamed, they actually get/put from/to user an int */
147 switch (cmd) {
148 case EXT2_IOC32_GETVERSION:
149 cmd = EXT2_IOC_GETVERSION;
150 break;
151 case EXT2_IOC32_SETVERSION:
152 cmd = EXT2_IOC_SETVERSION;
153 break;
154 default:
155 return -ENOIOCTLCMD;
156 }
157 return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
158}
159#endif