PCI: add ICH7/8 ACPI/GPIO io resource quirks
[pv_ops_mirror.git] / fs / ext4 / ioctl.c
blob22a737c306c7846693e4b032f2ca71091ec1113c
1 /*
2 * linux/fs/ext4/ioctl.c
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 */
10 #include <linux/fs.h>
11 #include <linux/jbd2.h>
12 #include <linux/capability.h>
13 #include <linux/ext4_fs.h>
14 #include <linux/ext4_jbd2.h>
15 #include <linux/time.h>
16 #include <linux/compat.h>
17 #include <linux/smp_lock.h>
18 #include <asm/uaccess.h>
20 int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
21 unsigned long arg)
23 struct ext4_inode_info *ei = EXT4_I(inode);
24 unsigned int flags;
25 unsigned short rsv_window_size;
27 ext4_debug ("cmd = %u, arg = %lu\n", cmd, arg);
29 switch (cmd) {
30 case EXT4_IOC_GETFLAGS:
31 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
32 return put_user(flags, (int __user *) arg);
33 case EXT4_IOC_SETFLAGS: {
34 handle_t *handle = NULL;
35 int err;
36 struct ext4_iloc iloc;
37 unsigned int oldflags;
38 unsigned int jflag;
40 if (IS_RDONLY(inode))
41 return -EROFS;
43 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
44 return -EACCES;
46 if (get_user(flags, (int __user *) arg))
47 return -EFAULT;
49 if (!S_ISDIR(inode->i_mode))
50 flags &= ~EXT4_DIRSYNC_FL;
52 mutex_lock(&inode->i_mutex);
53 oldflags = ei->i_flags;
55 /* The JOURNAL_DATA flag is modifiable only by root */
56 jflag = flags & EXT4_JOURNAL_DATA_FL;
59 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
60 * the relevant capability.
62 * This test looks nicer. Thanks to Pauline Middelink
64 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
65 if (!capable(CAP_LINUX_IMMUTABLE)) {
66 mutex_unlock(&inode->i_mutex);
67 return -EPERM;
72 * The JOURNAL_DATA flag can only be changed by
73 * the relevant capability.
75 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
76 if (!capable(CAP_SYS_RESOURCE)) {
77 mutex_unlock(&inode->i_mutex);
78 return -EPERM;
83 handle = ext4_journal_start(inode, 1);
84 if (IS_ERR(handle)) {
85 mutex_unlock(&inode->i_mutex);
86 return PTR_ERR(handle);
88 if (IS_SYNC(inode))
89 handle->h_sync = 1;
90 err = ext4_reserve_inode_write(handle, inode, &iloc);
91 if (err)
92 goto flags_err;
94 flags = flags & EXT4_FL_USER_MODIFIABLE;
95 flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE;
96 ei->i_flags = flags;
98 ext4_set_inode_flags(inode);
99 inode->i_ctime = CURRENT_TIME_SEC;
101 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
102 flags_err:
103 ext4_journal_stop(handle);
104 if (err) {
105 mutex_unlock(&inode->i_mutex);
106 return err;
109 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
110 err = ext4_change_inode_journal_flag(inode, jflag);
111 mutex_unlock(&inode->i_mutex);
112 return err;
114 case EXT4_IOC_GETVERSION:
115 case EXT4_IOC_GETVERSION_OLD:
116 return put_user(inode->i_generation, (int __user *) arg);
117 case EXT4_IOC_SETVERSION:
118 case EXT4_IOC_SETVERSION_OLD: {
119 handle_t *handle;
120 struct ext4_iloc iloc;
121 __u32 generation;
122 int err;
124 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
125 return -EPERM;
126 if (IS_RDONLY(inode))
127 return -EROFS;
128 if (get_user(generation, (int __user *) arg))
129 return -EFAULT;
131 handle = ext4_journal_start(inode, 1);
132 if (IS_ERR(handle))
133 return PTR_ERR(handle);
134 err = ext4_reserve_inode_write(handle, inode, &iloc);
135 if (err == 0) {
136 inode->i_ctime = CURRENT_TIME_SEC;
137 inode->i_generation = generation;
138 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
140 ext4_journal_stop(handle);
141 return err;
143 #ifdef CONFIG_JBD_DEBUG
144 case EXT4_IOC_WAIT_FOR_READONLY:
146 * This is racy - by the time we're woken up and running,
147 * the superblock could be released. And the module could
148 * have been unloaded. So sue me.
150 * Returns 1 if it slept, else zero.
153 struct super_block *sb = inode->i_sb;
154 DECLARE_WAITQUEUE(wait, current);
155 int ret = 0;
157 set_current_state(TASK_INTERRUPTIBLE);
158 add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
159 if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) {
160 schedule();
161 ret = 1;
163 remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait);
164 return ret;
166 #endif
167 case EXT4_IOC_GETRSVSZ:
168 if (test_opt(inode->i_sb, RESERVATION)
169 && S_ISREG(inode->i_mode)
170 && ei->i_block_alloc_info) {
171 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
172 return put_user(rsv_window_size, (int __user *)arg);
174 return -ENOTTY;
175 case EXT4_IOC_SETRSVSZ: {
177 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
178 return -ENOTTY;
180 if (IS_RDONLY(inode))
181 return -EROFS;
183 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
184 return -EACCES;
186 if (get_user(rsv_window_size, (int __user *)arg))
187 return -EFAULT;
189 if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS)
190 rsv_window_size = EXT4_MAX_RESERVE_BLOCKS;
193 * need to allocate reservation structure for this inode
194 * before set the window size
196 mutex_lock(&ei->truncate_mutex);
197 if (!ei->i_block_alloc_info)
198 ext4_init_block_alloc_info(inode);
200 if (ei->i_block_alloc_info){
201 struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
202 rsv->rsv_goal_size = rsv_window_size;
204 mutex_unlock(&ei->truncate_mutex);
205 return 0;
207 case EXT4_IOC_GROUP_EXTEND: {
208 ext4_fsblk_t n_blocks_count;
209 struct super_block *sb = inode->i_sb;
210 int err;
212 if (!capable(CAP_SYS_RESOURCE))
213 return -EPERM;
215 if (IS_RDONLY(inode))
216 return -EROFS;
218 if (get_user(n_blocks_count, (__u32 __user *)arg))
219 return -EFAULT;
221 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
222 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
223 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
224 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
226 return err;
228 case EXT4_IOC_GROUP_ADD: {
229 struct ext4_new_group_data input;
230 struct super_block *sb = inode->i_sb;
231 int err;
233 if (!capable(CAP_SYS_RESOURCE))
234 return -EPERM;
236 if (IS_RDONLY(inode))
237 return -EROFS;
239 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
240 sizeof(input)))
241 return -EFAULT;
243 err = ext4_group_add(sb, &input);
244 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
245 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
246 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
248 return err;
251 default:
252 return -ENOTTY;
256 #ifdef CONFIG_COMPAT
257 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
259 struct inode *inode = file->f_dentry->d_inode;
260 int ret;
262 /* These are just misnamed, they actually get/put from/to user an int */
263 switch (cmd) {
264 case EXT4_IOC32_GETFLAGS:
265 cmd = EXT4_IOC_GETFLAGS;
266 break;
267 case EXT4_IOC32_SETFLAGS:
268 cmd = EXT4_IOC_SETFLAGS;
269 break;
270 case EXT4_IOC32_GETVERSION:
271 cmd = EXT4_IOC_GETVERSION;
272 break;
273 case EXT4_IOC32_SETVERSION:
274 cmd = EXT4_IOC_SETVERSION;
275 break;
276 case EXT4_IOC32_GROUP_EXTEND:
277 cmd = EXT4_IOC_GROUP_EXTEND;
278 break;
279 case EXT4_IOC32_GETVERSION_OLD:
280 cmd = EXT4_IOC_GETVERSION_OLD;
281 break;
282 case EXT4_IOC32_SETVERSION_OLD:
283 cmd = EXT4_IOC_SETVERSION_OLD;
284 break;
285 #ifdef CONFIG_JBD_DEBUG
286 case EXT4_IOC32_WAIT_FOR_READONLY:
287 cmd = EXT4_IOC_WAIT_FOR_READONLY;
288 break;
289 #endif
290 case EXT4_IOC32_GETRSVSZ:
291 cmd = EXT4_IOC_GETRSVSZ;
292 break;
293 case EXT4_IOC32_SETRSVSZ:
294 cmd = EXT4_IOC_SETRSVSZ;
295 break;
296 case EXT4_IOC_GROUP_ADD:
297 break;
298 default:
299 return -ENOIOCTLCMD;
301 lock_kernel();
302 ret = ext4_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
303 unlock_kernel();
304 return ret;
306 #endif