[linux-2.6-block.git] / fs / ext3 / ioctl.c

/*
 * linux/fs/ext3/ioctl.c
 *
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 */

#include <linux/fs.h>
#include <linux/jbd.h>
#include <linux/capability.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
#include <linux/time.h>
#include <asm/uaccess.h>


int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
		unsigned long arg)
{
	struct ext3_inode_info *ei = EXT3_I(inode);
	unsigned int flags;
	unsigned short rsv_window_size;

	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT3_IOC_GETFLAGS:
		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT3_IOC_SETFLAGS: {
		handle_t *handle = NULL;
		int err;
		struct ext3_iloc iloc;
		unsigned int oldflags;
		unsigned int jflag;

		if (IS_RDONLY(inode))
			return -EROFS;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EACCES;

		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		if (!S_ISDIR(inode->i_mode))
			flags &= ~EXT3_DIRSYNC_FL;

		oldflags = ei->i_flags;

		/* The JOURNAL_DATA flag is modifiable only by root */
		jflag = flags & EXT3_JOURNAL_DATA_FL;

		/*
		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
		 * the relevant capability.
		 *
		 * This test looks nicer. Thanks to Pauline Middelink
		 */
		if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE))
				return -EPERM;
		}

		/*
		 * The JOURNAL_DATA flag can only be changed by
		 * the relevant capability.
		 */
		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
			if (!capable(CAP_SYS_RESOURCE))
				return -EPERM;
		}


		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle))
			return PTR_ERR(handle);
		if (IS_SYNC(inode))
			handle->h_sync = 1;
		err = ext3_reserve_inode_write(handle, inode, &iloc);
		if (err)
			goto flags_err;

		flags = flags & EXT3_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext3_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME_SEC;

		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
		ext3_journal_stop(handle);
		if (err)
			return err;

		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
			err = ext3_change_inode_journal_flag(inode, jflag);
		return err;
	}
	case EXT3_IOC_GETVERSION:
	case EXT3_IOC_GETVERSION_OLD:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT3_IOC_SETVERSION:
	case EXT3_IOC_SETVERSION_OLD: {
		handle_t *handle;
		struct ext3_iloc iloc;
		__u32 generation;
		int err;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EPERM;
		if (IS_RDONLY(inode))
			return -EROFS;
		if (get_user(generation, (int __user *) arg))
			return -EFAULT;

		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle))
			return PTR_ERR(handle);
		err = ext3_reserve_inode_write(handle, inode, &iloc);
		if (err == 0) {
			inode->i_ctime = CURRENT_TIME_SEC;
			inode->i_generation = generation;
			err = ext3_mark_iloc_dirty(handle, inode, &iloc);
		}
		ext3_journal_stop(handle);
		return err;
	}
#ifdef CONFIG_JBD_DEBUG
	case EXT3_IOC_WAIT_FOR_READONLY:
		/*
		 * This is racy - by the time we're woken up and running,
		 * the superblock could be released.  And the module could
		 * have been unloaded.  So sue me.
		 *
		 * Returns 1 if it slept, else zero.
		 */
		{
			struct super_block *sb = inode->i_sb;
			DECLARE_WAITQUEUE(wait, current);
			int ret = 0;

			set_current_state(TASK_INTERRUPTIBLE);
			add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
			if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
				schedule();
				ret = 1;
			}
			remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
			return ret;
		}
#endif
	case EXT3_IOC_GETRSVSZ:
		if (test_opt(inode->i_sb, RESERVATION)
			&& S_ISREG(inode->i_mode)
			&& ei->i_block_alloc_info) {
			rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
			return put_user(rsv_window_size, (int __user *)arg);
		}
		return -ENOTTY;
	case EXT3_IOC_SETRSVSZ: {

		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
			return -ENOTTY;

		if (IS_RDONLY(inode))
			return -EROFS;

		if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
			return -EACCES;

		if (get_user(rsv_window_size, (int __user *)arg))
			return -EFAULT;

		if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
			rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;

		/*
		 * need to allocate reservation structure for this inode
		 * before set the window size
		 */
		down(&ei->truncate_sem);
		if (!ei->i_block_alloc_info)
			ext3_init_block_alloc_info(inode);

		if (ei->i_block_alloc_info){
			struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
			rsv->rsv_goal_size = rsv_window_size;
		}
		up(&ei->truncate_sem);
		return 0;
	}
	case EXT3_IOC_GROUP_EXTEND: {
		unsigned long n_blocks_count;
		struct super_block *sb = inode->i_sb;
		int err;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (get_user(n_blocks_count, (__u32 __user *)arg))
			return -EFAULT;

		err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
		journal_lock_updates(EXT3_SB(sb)->s_journal);
		journal_flush(EXT3_SB(sb)->s_journal);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);

		return err;
	}
	case EXT3_IOC_GROUP_ADD: {
		struct ext3_new_group_data input;
		struct super_block *sb = inode->i_sb;
		int err;

		if (!capable(CAP_SYS_RESOURCE))
			return -EPERM;

		if (IS_RDONLY(inode))
			return -EROFS;

		if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
				sizeof(input)))
			return -EFAULT;

		err = ext3_group_add(sb, &input);
		journal_lock_updates(EXT3_SB(sb)->s_journal);
		journal_flush(EXT3_SB(sb)->s_journal);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);

		return err;
	}


	default:
		return -ENOTTY;
	}
}
Commit	Line	Data
1da177e4 LT	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>
16f7e0fe	12	#include <linux/capability.h>
1da177e4 LT	13	#include <linux/ext3_fs.h>
	14	#include <linux/ext3_jbd.h>
	15	#include <linux/time.h>
	16	#include <asm/uaccess.h>
	17
	18
	19	int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
	20	unsigned long arg)
	21	{
	22	struct ext3_inode_info *ei = EXT3_I(inode);
	23	unsigned int flags;
	24	unsigned short rsv_window_size;
	25
	26	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
	27
	28	switch (cmd) {
	29	case EXT3_IOC_GETFLAGS:
	30	flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
	31	return put_user(flags, (int __user *) arg);
	32	case EXT3_IOC_SETFLAGS: {
	33	handle_t *handle = NULL;
	34	int err;
	35	struct ext3_iloc iloc;
	36	unsigned int oldflags;
	37	unsigned int jflag;
	38
	39	if (IS_RDONLY(inode))
	40	return -EROFS;
	41
	42	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
	43	return -EACCES;
	44
	45	if (get_user(flags, (int __user *) arg))
	46	return -EFAULT;
	47
	48	if (!S_ISDIR(inode->i_mode))
	49	flags &= ~EXT3_DIRSYNC_FL;
	50
	51	oldflags = ei->i_flags;
	52
	53	/* The JOURNAL_DATA flag is modifiable only by root */
	54	jflag = flags & EXT3_JOURNAL_DATA_FL;
	55
	56	/*
	57	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	58	* the relevant capability.
	59	*
	60	* This test looks nicer. Thanks to Pauline Middelink
	61	*/
	62	if ((flags ^ oldflags) & (EXT3_APPEND_FL \| EXT3_IMMUTABLE_FL)) {
	63	if (!capable(CAP_LINUX_IMMUTABLE))
	64	return -EPERM;
	65	}
	66
	67	/*
	68	* The JOURNAL_DATA flag can only be changed by
	69	* the relevant capability.
	70	*/
	71	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
	72	if (!capable(CAP_SYS_RESOURCE))
	73	return -EPERM;
	74	}
	75
	76
77	handle = ext3_journal_start(inode, 1);
78	if (IS_ERR(handle))
79	return PTR_ERR(handle);
80	if (IS_SYNC(inode))
81	handle->h_sync = 1;
82	err = ext3_reserve_inode_write(handle, inode, &iloc);
83	if (err)
84	goto flags_err;
85
86	flags = flags & EXT3_FL_USER_MODIFIABLE;
87	flags \|= oldflags & ~EXT3_FL_USER_MODIFIABLE;
88	ei->i_flags = flags;
89
90	ext3_set_inode_flags(inode);
91	inode->i_ctime = CURRENT_TIME_SEC;
92
93	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
94	flags_err:
95	ext3_journal_stop(handle);
96	if (err)
97	return err;
98
99	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
100	err = ext3_change_inode_journal_flag(inode, jflag);
101	return err;
102	}
103	case EXT3_IOC_GETVERSION:
104	case EXT3_IOC_GETVERSION_OLD:
105	return put_user(inode->i_generation, (int __user *) arg);
106	case EXT3_IOC_SETVERSION:
107	case EXT3_IOC_SETVERSION_OLD: {
108	handle_t *handle;
109	struct ext3_iloc iloc;
110	__u32 generation;
111	int err;
112
113	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
114	return -EPERM;
115	if (IS_RDONLY(inode))
116	return -EROFS;
117	if (get_user(generation, (int __user *) arg))
118	return -EFAULT;
119
120	handle = ext3_journal_start(inode, 1);
121	if (IS_ERR(handle))
122	return PTR_ERR(handle);
123	err = ext3_reserve_inode_write(handle, inode, &iloc);
124	if (err == 0) {
125	inode->i_ctime = CURRENT_TIME_SEC;
126	inode->i_generation = generation;
127	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
128	}
129	ext3_journal_stop(handle);
130	return err;
131	}
132	#ifdef CONFIG_JBD_DEBUG
133	case EXT3_IOC_WAIT_FOR_READONLY:
134	/*
135	* This is racy - by the time we're woken up and running,
136	* the superblock could be released. And the module could
137	* have been unloaded. So sue me.
138	*
139	* Returns 1 if it slept, else zero.
140	*/
141	{
142	struct super_block *sb = inode->i_sb;
143	DECLARE_WAITQUEUE(wait, current);
144	int ret = 0;
145
146	set_current_state(TASK_INTERRUPTIBLE);
147	add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
148	if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
149	schedule();
150	ret = 1;
151	}
152	remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
153	return ret;
154	}
155	#endif
156	case EXT3_IOC_GETRSVSZ:
157	if (test_opt(inode->i_sb, RESERVATION)
158	&& S_ISREG(inode->i_mode)
159	&& ei->i_block_alloc_info) {
160	rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
161	return put_user(rsv_window_size, (int __user *)arg);
162	}
163	return -ENOTTY;
164	case EXT3_IOC_SETRSVSZ: {
165
166	if (!test_opt(inode->i_sb, RESERVATION) \|\|!S_ISREG(inode->i_mode))
167	return -ENOTTY;
168
169	if (IS_RDONLY(inode))
170	return -EROFS;
171
172	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
173	return -EACCES;
174
175	if (get_user(rsv_window_size, (int __user *)arg))
176	return -EFAULT;
177
178	if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
179	rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
180
181	/*
182	* need to allocate reservation structure for this inode
183	* before set the window size
184	*/
185	down(&ei->truncate_sem);
186	if (!ei->i_block_alloc_info)
187	ext3_init_block_alloc_info(inode);
188
189	if (ei->i_block_alloc_info){
190	struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
191	rsv->rsv_goal_size = rsv_window_size;
192	}
193	up(&ei->truncate_sem);
194	return 0;
195	}
196	case EXT3_IOC_GROUP_EXTEND: {
197	unsigned long n_blocks_count;
198	struct super_block *sb = inode->i_sb;
199	int err;
200
201	if (!capable(CAP_SYS_RESOURCE))
202	return -EPERM;
203
204	if (IS_RDONLY(inode))
205	return -EROFS;
206
207	if (get_user(n_blocks_count, (__u32 __user *)arg))
208	return -EFAULT;
209
210	err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
211	journal_lock_updates(EXT3_SB(sb)->s_journal);
212	journal_flush(EXT3_SB(sb)->s_journal);
213	journal_unlock_updates(EXT3_SB(sb)->s_journal);
214
215	return err;
216	}
217	case EXT3_IOC_GROUP_ADD: {
218	struct ext3_new_group_data input;
219	struct super_block *sb = inode->i_sb;
220	int err;
221
222	if (!capable(CAP_SYS_RESOURCE))
223	return -EPERM;
224
225	if (IS_RDONLY(inode))
226	return -EROFS;
227
228	if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
229	sizeof(input)))
230	return -EFAULT;
231
232	err = ext3_group_add(sb, &input);
233	journal_lock_updates(EXT3_SB(sb)->s_journal);
234	journal_flush(EXT3_SB(sb)->s_journal);
235	journal_unlock_updates(EXT3_SB(sb)->s_journal);
236
237	return err;
238	}
239
240
241	default:
242	return -ENOTTY;
243	}
244	}