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/mount.h>
12 #include <linux/jbd.h>
13 #include <linux/capability.h>
14 #include <linux/ext3_fs.h>
15 #include <linux/ext3_jbd.h>
16 #include <linux/time.h>
17 #include <linux/compat.h>
18 #include <linux/smp_lock.h>
19 #include <linux/vs_tag.h>
20 #include <asm/uaccess.h>
22 int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
25 struct ext3_inode_info *ei = EXT3_I(inode);
27 unsigned short rsv_window_size;
29 ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
32 case EXT3_IOC_GETFLAGS:
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 if (IS_RDONLY(inode) ||
43 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
46 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
49 if (get_user(flags, (int __user *) arg))
52 if (!S_ISDIR(inode->i_mode))
53 flags &= ~EXT3_DIRSYNC_FL;
55 mutex_lock(&inode->i_mutex);
56 oldflags = ei->i_flags;
58 /* The JOURNAL_DATA flag is modifiable only by root */
59 jflag = flags & EXT3_JOURNAL_DATA_FL;
62 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
63 * the relevant capability.
65 * This test looks nicer. Thanks to Pauline Middelink
67 if ((oldflags & EXT3_IMMUTABLE_FL) ||
68 ((flags ^ oldflags) & (EXT3_APPEND_FL |
69 EXT3_IMMUTABLE_FL | EXT3_IUNLINK_FL))) {
70 if (!capable(CAP_LINUX_IMMUTABLE)) {
71 mutex_unlock(&inode->i_mutex);
77 * The JOURNAL_DATA flag can only be changed by
78 * the relevant capability.
80 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
81 if (!capable(CAP_SYS_RESOURCE)) {
82 mutex_unlock(&inode->i_mutex);
88 handle = ext3_journal_start(inode, 1);
90 mutex_unlock(&inode->i_mutex);
91 return PTR_ERR(handle);
95 err = ext3_reserve_inode_write(handle, inode, &iloc);
99 flags = flags & EXT3_FL_USER_MODIFIABLE;
100 flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
103 ext3_set_inode_flags(inode);
104 inode->i_ctime = CURRENT_TIME_SEC;
106 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
108 ext3_journal_stop(handle);
110 mutex_unlock(&inode->i_mutex);
114 if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
115 err = ext3_change_inode_journal_flag(inode, jflag);
116 mutex_unlock(&inode->i_mutex);
119 case EXT3_IOC_GETVERSION:
120 case EXT3_IOC_GETVERSION_OLD:
121 return put_user(inode->i_generation, (int __user *) arg);
122 case EXT3_IOC_SETVERSION:
123 case EXT3_IOC_SETVERSION_OLD: {
125 struct ext3_iloc iloc;
129 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
131 if (IS_RDONLY(inode) ||
132 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
134 if (get_user(generation, (int __user *) arg))
137 handle = ext3_journal_start(inode, 1);
139 return PTR_ERR(handle);
140 err = ext3_reserve_inode_write(handle, inode, &iloc);
142 inode->i_ctime = CURRENT_TIME_SEC;
143 inode->i_generation = generation;
144 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
146 ext3_journal_stop(handle);
149 #ifdef CONFIG_JBD_DEBUG
150 case EXT3_IOC_WAIT_FOR_READONLY:
152 * This is racy - by the time we're woken up and running,
153 * the superblock could be released. And the module could
154 * have been unloaded. So sue me.
156 * Returns 1 if it slept, else zero.
159 struct super_block *sb = inode->i_sb;
160 DECLARE_WAITQUEUE(wait, current);
163 set_current_state(TASK_INTERRUPTIBLE);
164 add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
165 if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
169 remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
173 case EXT3_IOC_GETRSVSZ:
174 if (test_opt(inode->i_sb, RESERVATION)
175 && S_ISREG(inode->i_mode)
176 && ei->i_block_alloc_info) {
177 rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
178 return put_user(rsv_window_size, (int __user *)arg);
181 case EXT3_IOC_SETRSVSZ: {
183 if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
186 if (IS_RDONLY(inode) ||
187 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
190 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
193 if (get_user(rsv_window_size, (int __user *)arg))
196 if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
197 rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
200 * need to allocate reservation structure for this inode
201 * before set the window size
203 mutex_lock(&ei->truncate_mutex);
204 if (!ei->i_block_alloc_info)
205 ext3_init_block_alloc_info(inode);
207 if (ei->i_block_alloc_info){
208 struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
209 rsv->rsv_goal_size = rsv_window_size;
211 mutex_unlock(&ei->truncate_mutex);
214 case EXT3_IOC_GROUP_EXTEND: {
215 ext3_fsblk_t n_blocks_count;
216 struct super_block *sb = inode->i_sb;
219 if (!capable(CAP_SYS_RESOURCE))
222 if (IS_RDONLY(inode) ||
223 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
226 if (get_user(n_blocks_count, (__u32 __user *)arg))
229 err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
230 journal_lock_updates(EXT3_SB(sb)->s_journal);
231 journal_flush(EXT3_SB(sb)->s_journal);
232 journal_unlock_updates(EXT3_SB(sb)->s_journal);
236 case EXT3_IOC_GROUP_ADD: {
237 struct ext3_new_group_data input;
238 struct super_block *sb = inode->i_sb;
241 if (!capable(CAP_SYS_RESOURCE))
244 if (IS_RDONLY(inode) ||
245 (filp && MNT_IS_RDONLY(filp->f_vfsmnt)))
248 if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
252 err = ext3_group_add(sb, &input);
253 journal_lock_updates(EXT3_SB(sb)->s_journal);
254 journal_flush(EXT3_SB(sb)->s_journal);
255 journal_unlock_updates(EXT3_SB(sb)->s_journal);
260 #if defined(CONFIG_VSERVER_LEGACY) && !defined(CONFIG_TAGGING_NONE)
261 case EXT3_IOC_SETTAG: {
263 struct ext3_iloc iloc;
267 /* fixme: if stealth, return -ENOTTY */
268 if (!capable(CAP_CONTEXT))
270 if (IS_RDONLY(inode))
272 if (!(inode->i_sb->s_flags & MS_TAGGED))
274 if (get_user(tag, (int __user *) arg))
277 handle = ext3_journal_start(inode, 1);
279 return PTR_ERR(handle);
280 err = ext3_reserve_inode_write(handle, inode, &iloc);
284 inode->i_tag = (tag & 0xFFFF);
285 inode->i_ctime = CURRENT_TIME;
287 err = ext3_mark_iloc_dirty(handle, inode, &iloc);
288 ext3_journal_stop(handle);
299 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
301 struct inode *inode = file->f_path.dentry->d_inode;
304 /* These are just misnamed, they actually get/put from/to user an int */
306 case EXT3_IOC32_GETFLAGS:
307 cmd = EXT3_IOC_GETFLAGS;
309 case EXT3_IOC32_SETFLAGS:
310 cmd = EXT3_IOC_SETFLAGS;
312 case EXT3_IOC32_GETVERSION:
313 cmd = EXT3_IOC_GETVERSION;
315 case EXT3_IOC32_SETVERSION:
316 cmd = EXT3_IOC_SETVERSION;
318 case EXT3_IOC32_GROUP_EXTEND:
319 cmd = EXT3_IOC_GROUP_EXTEND;
321 case EXT3_IOC32_GETVERSION_OLD:
322 cmd = EXT3_IOC_GETVERSION_OLD;
324 case EXT3_IOC32_SETVERSION_OLD:
325 cmd = EXT3_IOC_SETVERSION_OLD;
327 #ifdef CONFIG_JBD_DEBUG
328 case EXT3_IOC32_WAIT_FOR_READONLY:
329 cmd = EXT3_IOC_WAIT_FOR_READONLY;
332 case EXT3_IOC32_GETRSVSZ:
333 cmd = EXT3_IOC_GETRSVSZ;
335 case EXT3_IOC32_SETRSVSZ:
336 cmd = EXT3_IOC_SETRSVSZ;
338 case EXT3_IOC_GROUP_ADD:
344 ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));