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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * linux/fs/ext3/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 <linux/fs.h>
11#include <linux/jbd.h>
12#include <linux/capability.h>
13#include <linux/ext3_fs.h>
14#include <linux/ext3_jbd.h>
15#include <linux/mount.h>
16#include <linux/time.h>
17#include <linux/compat.h>
18#include <asm/uaccess.h>
19
20long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
21{
22 struct inode *inode = filp->f_dentry->d_inode;
23 struct ext3_inode_info *ei = EXT3_I(inode);
24 unsigned int flags;
25 unsigned short rsv_window_size;
26
27 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
28
29 switch (cmd) {
30 case EXT3_IOC_GETFLAGS:
31 ext3_get_inode_flags(ei);
32 flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
33 return put_user(flags, (int __user *) arg);
34 case EXT3_IOC_SETFLAGS: {
35 handle_t *handle = NULL;
36 int err;
37 struct ext3_iloc iloc;
38 unsigned int oldflags;
39 unsigned int jflag;
40
41 if (!inode_owner_or_capable(inode))
42 return -EACCES;
43
44 if (get_user(flags, (int __user *) arg))
45 return -EFAULT;
46
47 err = mnt_want_write(filp->f_path.mnt);
48 if (err)
49 return err;
50
51 flags = ext3_mask_flags(inode->i_mode, flags);
52
53 mutex_lock(&inode->i_mutex);
54
55 /* Is it quota file? Do not allow user to mess with it */
56 err = -EPERM;
57 if (IS_NOQUOTA(inode))
58 goto flags_out;
59
60 oldflags = ei->i_flags;
61
62 /* The JOURNAL_DATA flag is modifiable only by root */
63 jflag = flags & EXT3_JOURNAL_DATA_FL;
64
65 /*
66 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
67 * the relevant capability.
68 *
69 * This test looks nicer. Thanks to Pauline Middelink
70 */
71 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
72 if (!capable(CAP_LINUX_IMMUTABLE))
73 goto flags_out;
74 }
75
76 /*
77 * The JOURNAL_DATA flag can only be changed by
78 * the relevant capability.
79 */
80 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
81 if (!capable(CAP_SYS_RESOURCE))
82 goto flags_out;
83 }
84
85 handle = ext3_journal_start(inode, 1);
86 if (IS_ERR(handle)) {
87 err = PTR_ERR(handle);
88 goto flags_out;
89 }
90 if (IS_SYNC(inode))
91 handle->h_sync = 1;
92 err = ext3_reserve_inode_write(handle, inode, &iloc);
93 if (err)
94 goto flags_err;
95
96 flags = flags & EXT3_FL_USER_MODIFIABLE;
97 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
98 ei->i_flags = flags;
99
100 ext3_set_inode_flags(inode);
101 inode->i_ctime = CURRENT_TIME_SEC;
102
103 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
104flags_err:
105 ext3_journal_stop(handle);
106 if (err)
107 goto flags_out;
108
109 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
110 err = ext3_change_inode_journal_flag(inode, jflag);
111flags_out:
112 mutex_unlock(&inode->i_mutex);
113 mnt_drop_write(filp->f_path.mnt);
114 return err;
115 }
116 case EXT3_IOC_GETVERSION:
117 case EXT3_IOC_GETVERSION_OLD:
118 return put_user(inode->i_generation, (int __user *) arg);
119 case EXT3_IOC_SETVERSION:
120 case EXT3_IOC_SETVERSION_OLD: {
121 handle_t *handle;
122 struct ext3_iloc iloc;
123 __u32 generation;
124 int err;
125
126 if (!inode_owner_or_capable(inode))
127 return -EPERM;
128
129 err = mnt_want_write(filp->f_path.mnt);
130 if (err)
131 return err;
132 if (get_user(generation, (int __user *) arg)) {
133 err = -EFAULT;
134 goto setversion_out;
135 }
136
137 handle = ext3_journal_start(inode, 1);
138 if (IS_ERR(handle)) {
139 err = PTR_ERR(handle);
140 goto setversion_out;
141 }
142 err = ext3_reserve_inode_write(handle, inode, &iloc);
143 if (err == 0) {
144 inode->i_ctime = CURRENT_TIME_SEC;
145 inode->i_generation = generation;
146 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
147 }
148 ext3_journal_stop(handle);
149setversion_out:
150 mnt_drop_write(filp->f_path.mnt);
151 return err;
152 }
153 case EXT3_IOC_GETRSVSZ:
154 if (test_opt(inode->i_sb, RESERVATION)
155 && S_ISREG(inode->i_mode)
156 && ei->i_block_alloc_info) {
157 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
158 return put_user(rsv_window_size, (int __user *)arg);
159 }
160 return -ENOTTY;
161 case EXT3_IOC_SETRSVSZ: {
162 int err;
163
164 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
165 return -ENOTTY;
166
167 err = mnt_want_write(filp->f_path.mnt);
168 if (err)
169 return err;
170
171 if (!inode_owner_or_capable(inode)) {
172 err = -EACCES;
173 goto setrsvsz_out;
174 }
175
176 if (get_user(rsv_window_size, (int __user *)arg)) {
177 err = -EFAULT;
178 goto setrsvsz_out;
179 }
180
181 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
182 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
183
184 /*
185 * need to allocate reservation structure for this inode
186 * before set the window size
187 */
188 mutex_lock(&ei->truncate_mutex);
189 if (!ei->i_block_alloc_info)
190 ext3_init_block_alloc_info(inode);
191
192 if (ei->i_block_alloc_info){
193 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
194 rsv->rsv_goal_size = rsv_window_size;
195 }
196 mutex_unlock(&ei->truncate_mutex);
197setrsvsz_out:
198 mnt_drop_write(filp->f_path.mnt);
199 return err;
200 }
201 case EXT3_IOC_GROUP_EXTEND: {
202 ext3_fsblk_t n_blocks_count;
203 struct super_block *sb = inode->i_sb;
204 int err, err2;
205
206 if (!capable(CAP_SYS_RESOURCE))
207 return -EPERM;
208
209 err = mnt_want_write(filp->f_path.mnt);
210 if (err)
211 return err;
212
213 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
214 err = -EFAULT;
215 goto group_extend_out;
216 }
217 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
218 journal_lock_updates(EXT3_SB(sb)->s_journal);
219 err2 = journal_flush(EXT3_SB(sb)->s_journal);
220 journal_unlock_updates(EXT3_SB(sb)->s_journal);
221 if (err == 0)
222 err = err2;
223group_extend_out:
224 mnt_drop_write(filp->f_path.mnt);
225 return err;
226 }
227 case EXT3_IOC_GROUP_ADD: {
228 struct ext3_new_group_data input;
229 struct super_block *sb = inode->i_sb;
230 int err, err2;
231
232 if (!capable(CAP_SYS_RESOURCE))
233 return -EPERM;
234
235 err = mnt_want_write(filp->f_path.mnt);
236 if (err)
237 return err;
238
239 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
240 sizeof(input))) {
241 err = -EFAULT;
242 goto group_add_out;
243 }
244
245 err = ext3_group_add(sb, &input);
246 journal_lock_updates(EXT3_SB(sb)->s_journal);
247 err2 = journal_flush(EXT3_SB(sb)->s_journal);
248 journal_unlock_updates(EXT3_SB(sb)->s_journal);
249 if (err == 0)
250 err = err2;
251group_add_out:
252 mnt_drop_write(filp->f_path.mnt);
253 return err;
254 }
255 case FITRIM: {
256
257 struct super_block *sb = inode->i_sb;
258 struct fstrim_range range;
259 int ret = 0;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EPERM;
263
264 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
265 sizeof(range)))
266 return -EFAULT;
267
268 ret = ext3_trim_fs(sb, &range);
269 if (ret < 0)
270 return ret;
271
272 if (copy_to_user((struct fstrim_range __user *)arg, &range,
273 sizeof(range)))
274 return -EFAULT;
275
276 return 0;
277 }
278
279 default:
280 return -ENOTTY;
281 }
282}
283
284#ifdef CONFIG_COMPAT
285long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
286{
287 /* These are just misnamed, they actually get/put from/to user an int */
288 switch (cmd) {
289 case EXT3_IOC32_GETFLAGS:
290 cmd = EXT3_IOC_GETFLAGS;
291 break;
292 case EXT3_IOC32_SETFLAGS:
293 cmd = EXT3_IOC_SETFLAGS;
294 break;
295 case EXT3_IOC32_GETVERSION:
296 cmd = EXT3_IOC_GETVERSION;
297 break;
298 case EXT3_IOC32_SETVERSION:
299 cmd = EXT3_IOC_SETVERSION;
300 break;
301 case EXT3_IOC32_GROUP_EXTEND:
302 cmd = EXT3_IOC_GROUP_EXTEND;
303 break;
304 case EXT3_IOC32_GETVERSION_OLD:
305 cmd = EXT3_IOC_GETVERSION_OLD;
306 break;
307 case EXT3_IOC32_SETVERSION_OLD:
308 cmd = EXT3_IOC_SETVERSION_OLD;
309 break;
310#ifdef CONFIG_JBD_DEBUG
311 case EXT3_IOC32_WAIT_FOR_READONLY:
312 cmd = EXT3_IOC_WAIT_FOR_READONLY;
313 break;
314#endif
315 case EXT3_IOC32_GETRSVSZ:
316 cmd = EXT3_IOC_GETRSVSZ;
317 break;
318 case EXT3_IOC32_SETRSVSZ:
319 cmd = EXT3_IOC_SETRSVSZ;
320 break;
321 case EXT3_IOC_GROUP_ADD:
322 break;
323 default:
324 return -ENOIOCTLCMD;
325 }
326 return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
327}
328#endif