2 * linux/fs/ext3/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)
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 <linux/smp_lock.h>
19 #include <asm/uaccess.h>
21 int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
24 struct ext3_inode_info *ei = EXT3_I(inode);
26 unsigned short rsv_window_size;
28 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
31 case EXT3_IOC_GETFLAGS:
32 ext3_get_inode_flags(ei);
33 flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
34 return put_user(flags, (int __user *) arg);
35 case EXT3_IOC_SETFLAGS: {
36 handle_t *handle = NULL;
38 struct ext3_iloc iloc;
39 unsigned int oldflags;
42 err = mnt_want_write(filp->f_path.mnt);
46 if (!is_owner_or_cap(inode)) {
51 if (get_user(flags, (int __user *) arg)) {
56 if (!S_ISDIR(inode->i_mode))
57 flags &= ~EXT3_DIRSYNC_FL;
59 mutex_lock(&inode->i_mutex);
60 /* Is it quota file? Do not allow user to mess with it */
61 if (IS_NOQUOTA(inode)) {
62 mutex_unlock(&inode->i_mutex);
66 oldflags = ei->i_flags;
68 /* The JOURNAL_DATA flag is modifiable only by root */
69 jflag = flags & EXT3_JOURNAL_DATA_FL;
72 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
73 * the relevant capability.
75 * This test looks nicer. Thanks to Pauline Middelink
77 if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
78 if (!capable(CAP_LINUX_IMMUTABLE)) {
79 mutex_unlock(&inode->i_mutex);
86 * The JOURNAL_DATA flag can only be changed by
87 * the relevant capability.
89 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
90 if (!capable(CAP_SYS_RESOURCE)) {
91 mutex_unlock(&inode->i_mutex);
98 handle = ext3_journal_start(inode, 1);
100 mutex_unlock(&inode->i_mutex);
101 err = PTR_ERR(handle);
106 err = ext3_reserve_inode_write(handle, inode, &iloc);
110 flags = flags & EXT3_FL_USER_MODIFIABLE;
111 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
114 ext3_set_inode_flags(inode);
115 inode->i_ctime = CURRENT_TIME_SEC;
117 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
119 ext3_journal_stop(handle);
121 mutex_unlock(&inode->i_mutex);
125 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
126 err = ext3_change_inode_journal_flag(inode, jflag);
127 mutex_unlock(&inode->i_mutex);
129 mnt_drop_write(filp->f_path.mnt);
132 case EXT3_IOC_GETVERSION:
133 case EXT3_IOC_GETVERSION_OLD:
134 return put_user(inode->i_generation, (int __user *) arg);
135 case EXT3_IOC_SETVERSION:
136 case EXT3_IOC_SETVERSION_OLD: {
138 struct ext3_iloc iloc;
142 if (!is_owner_or_cap(inode))
144 err = mnt_want_write(filp->f_path.mnt);
147 if (get_user(generation, (int __user *) arg)) {
151 handle = ext3_journal_start(inode, 1);
152 if (IS_ERR(handle)) {
153 err = PTR_ERR(handle);
156 err = ext3_reserve_inode_write(handle, inode, &iloc);
158 inode->i_ctime = CURRENT_TIME_SEC;
159 inode->i_generation = generation;
160 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
162 ext3_journal_stop(handle);
164 mnt_drop_write(filp->f_path.mnt);
167 #ifdef CONFIG_JBD_DEBUG
168 case EXT3_IOC_WAIT_FOR_READONLY:
170 * This is racy - by the time we're woken up and running,
171 * the superblock could be released. And the module could
172 * have been unloaded. So sue me.
174 * Returns 1 if it slept, else zero.
177 struct super_block *sb = inode->i_sb;
178 DECLARE_WAITQUEUE(wait, current);
181 set_current_state(TASK_INTERRUPTIBLE);
182 add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
183 if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
187 remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
191 case EXT3_IOC_GETRSVSZ:
192 if (test_opt(inode->i_sb, RESERVATION)
193 && S_ISREG(inode->i_mode)
194 && ei->i_block_alloc_info) {
195 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
196 return put_user(rsv_window_size, (int __user *)arg);
199 case EXT3_IOC_SETRSVSZ: {
202 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
205 err = mnt_want_write(filp->f_path.mnt);
209 if (!is_owner_or_cap(inode)) {
214 if (get_user(rsv_window_size, (int __user *)arg)) {
219 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
220 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
223 * need to allocate reservation structure for this inode
224 * before set the window size
226 mutex_lock(&ei->truncate_mutex);
227 if (!ei->i_block_alloc_info)
228 ext3_init_block_alloc_info(inode);
230 if (ei->i_block_alloc_info){
231 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
232 rsv->rsv_goal_size = rsv_window_size;
234 mutex_unlock(&ei->truncate_mutex);
236 mnt_drop_write(filp->f_path.mnt);
239 case EXT3_IOC_GROUP_EXTEND: {
240 ext3_fsblk_t n_blocks_count;
241 struct super_block *sb = inode->i_sb;
244 if (!capable(CAP_SYS_RESOURCE))
247 err = mnt_want_write(filp->f_path.mnt);
251 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
253 goto group_extend_out;
255 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
256 journal_lock_updates(EXT3_SB(sb)->s_journal);
257 err2 = journal_flush(EXT3_SB(sb)->s_journal);
258 journal_unlock_updates(EXT3_SB(sb)->s_journal);
262 mnt_drop_write(filp->f_path.mnt);
265 case EXT3_IOC_GROUP_ADD: {
266 struct ext3_new_group_data input;
267 struct super_block *sb = inode->i_sb;
270 if (!capable(CAP_SYS_RESOURCE))
273 err = mnt_want_write(filp->f_path.mnt);
277 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
283 err = ext3_group_add(sb, &input);
284 journal_lock_updates(EXT3_SB(sb)->s_journal);
285 err2 = journal_flush(EXT3_SB(sb)->s_journal);
286 journal_unlock_updates(EXT3_SB(sb)->s_journal);
290 mnt_drop_write(filp->f_path.mnt);
301 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
303 struct inode *inode = file->f_path.dentry->d_inode;
306 /* These are just misnamed, they actually get/put from/to user an int */
308 case EXT3_IOC32_GETFLAGS:
309 cmd = EXT3_IOC_GETFLAGS;
311 case EXT3_IOC32_SETFLAGS:
312 cmd = EXT3_IOC_SETFLAGS;
314 case EXT3_IOC32_GETVERSION:
315 cmd = EXT3_IOC_GETVERSION;
317 case EXT3_IOC32_SETVERSION:
318 cmd = EXT3_IOC_SETVERSION;
320 case EXT3_IOC32_GROUP_EXTEND:
321 cmd = EXT3_IOC_GROUP_EXTEND;
323 case EXT3_IOC32_GETVERSION_OLD:
324 cmd = EXT3_IOC_GETVERSION_OLD;
326 case EXT3_IOC32_SETVERSION_OLD:
327 cmd = EXT3_IOC_SETVERSION_OLD;
329 #ifdef CONFIG_JBD_DEBUG
330 case EXT3_IOC32_WAIT_FOR_READONLY:
331 cmd = EXT3_IOC_WAIT_FOR_READONLY;
334 case EXT3_IOC32_GETRSVSZ:
335 cmd = EXT3_IOC_GETRSVSZ;
337 case EXT3_IOC32_SETRSVSZ:
338 cmd = EXT3_IOC_SETRSVSZ;
340 case EXT3_IOC_GROUP_ADD:
346 ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));