[linux.git] / fs / ext3 / ioctl.c

/*
 * linux/fs/ext3/ioctl.c
 *
 * Copyright (C) 1993, 1994, 1995
 * Remy Card ([email protected])
 * 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 <linux/compat.h>
#include <linux/smp_lock.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;

		mutex_lock(&inode->i_mutex);
		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)) {
				mutex_unlock(&inode->i_mutex);
				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)) {
				mutex_unlock(&inode->i_mutex);
				return -EPERM;
			}
		}


		handle = ext3_journal_start(inode, 1);
		if (IS_ERR(handle)) {
			mutex_unlock(&inode->i_mutex);
			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) {
			mutex_unlock(&inode->i_mutex);
			return err;
		}

		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
			err = ext3_change_inode_journal_flag(inode, jflag);
		mutex_unlock(&inode->i_mutex);
		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
		 */
		mutex_lock(&ei->truncate_mutex);
		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;
		}
		mutex_unlock(&ei->truncate_mutex);
		return 0;
	}
	case EXT3_IOC_GROUP_EXTEND: {
		ext3_fsblk_t 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;
	}
}

#ifdef CONFIG_COMPAT
long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	int ret;

	/* These are just misnamed, they actually get/put from/to user an int */
	switch (cmd) {
	case EXT3_IOC32_GETFLAGS:
		cmd = EXT3_IOC_GETFLAGS;
		break;
	case EXT3_IOC32_SETFLAGS:
		cmd = EXT3_IOC_SETFLAGS;
		break;
	case EXT3_IOC32_GETVERSION:
		cmd = EXT3_IOC_GETVERSION;
		break;
	case EXT3_IOC32_SETVERSION:
		cmd = EXT3_IOC_SETVERSION;
		break;
	case EXT3_IOC32_GROUP_EXTEND:
		cmd = EXT3_IOC_GROUP_EXTEND;
		break;
	case EXT3_IOC32_GETVERSION_OLD:
		cmd = EXT3_IOC_GETVERSION_OLD;
		break;
	case EXT3_IOC32_SETVERSION_OLD:
		cmd = EXT3_IOC_SETVERSION_OLD;
		break;
#ifdef CONFIG_JBD_DEBUG
	case EXT3_IOC32_WAIT_FOR_READONLY:
		cmd = EXT3_IOC_WAIT_FOR_READONLY;
		break;
#endif
	case EXT3_IOC32_GETRSVSZ:
		cmd = EXT3_IOC_GETRSVSZ;
		break;
	case EXT3_IOC32_SETRSVSZ:
		cmd = EXT3_IOC_SETRSVSZ;
		break;
	case EXT3_IOC_GROUP_ADD:
		break;
	default:
		return -ENOIOCTLCMD;
	}
	lock_kernel();
	ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	unlock_kernel();
	return ret;
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext3/ioctl.c
	3	*
	4	* Copyright (C) 1993, 1994, 1995
	5	* Remy Card ([email protected])
	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>
52a700c5 DH	16	#include <linux/compat.h>
52a700c5 DH	17	#include <linux/smp_lock.h>
1da177e4 LT	18	#include <asm/uaccess.h>
1da177e4 LT	19
1da177e4 LT	20	int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
	21	unsigned long arg)
	22	{
	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	flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
	32	return put_user(flags, (int __user *) arg);
	33	case EXT3_IOC_SETFLAGS: {
	34	handle_t *handle = NULL;
	35	int err;
	36	struct ext3_iloc iloc;
	37	unsigned int oldflags;
	38	unsigned int jflag;
	39
	40	if (IS_RDONLY(inode))
	41	return -EROFS;
	42
	43	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
	44	return -EACCES;
	45
	46	if (get_user(flags, (int __user *) arg))
	47	return -EFAULT;
	48
	49	if (!S_ISDIR(inode->i_mode))
	50	flags &= ~EXT3_DIRSYNC_FL;
	51
a090d913	52	mutex_lock(&inode->i_mutex);
1da177e4 LT	53	oldflags = ei->i_flags;
	54
	55	/* The JOURNAL_DATA flag is modifiable only by root */
	56	jflag = flags & EXT3_JOURNAL_DATA_FL;
	57
	58	/*
	59	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	60	* the relevant capability.
	61	*
	62	* This test looks nicer. Thanks to Pauline Middelink
	63	*/
	64	if ((flags ^ oldflags) & (EXT3_APPEND_FL \| EXT3_IMMUTABLE_FL)) {
a090d913 AV	65	if (!capable(CAP_LINUX_IMMUTABLE)) {
a090d913 AV	66	mutex_unlock(&inode->i_mutex);
1da177e4	67	return -EPERM;
a090d913	68	}
1da177e4 LT	69	}
	70
	71	/*
	72	* The JOURNAL_DATA flag can only be changed by
	73	* the relevant capability.
	74	*/
	75	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
a090d913 AV	76	if (!capable(CAP_SYS_RESOURCE)) {
a090d913 AV	77	mutex_unlock(&inode->i_mutex);
1da177e4	78	return -EPERM;
a090d913	79	}
1da177e4 LT	80	}
	81
	82
	83	handle = ext3_journal_start(inode, 1);
a090d913 AV	84	if (IS_ERR(handle)) {
a090d913 AV	85	mutex_unlock(&inode->i_mutex);
1da177e4	86	return PTR_ERR(handle);
a090d913	87	}
1da177e4 LT	88	if (IS_SYNC(inode))
	89	handle->h_sync = 1;
	90	err = ext3_reserve_inode_write(handle, inode, &iloc);
	91	if (err)
	92	goto flags_err;
	93
	94	flags = flags & EXT3_FL_USER_MODIFIABLE;
	95	flags \|= oldflags & ~EXT3_FL_USER_MODIFIABLE;
	96	ei->i_flags = flags;
	97
	98	ext3_set_inode_flags(inode);
	99	inode->i_ctime = CURRENT_TIME_SEC;
	100
	101	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
	102	flags_err:
	103	ext3_journal_stop(handle);
a090d913 AV	104	if (err) {
a090d913 AV	105	mutex_unlock(&inode->i_mutex);
1da177e4	106	return err;
a090d913	107	}
1da177e4 LT	108
	109	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
	110	err = ext3_change_inode_journal_flag(inode, jflag);
a090d913	111	mutex_unlock(&inode->i_mutex);
1da177e4 LT	112	return err;
	113	}
	114	case EXT3_IOC_GETVERSION:
	115	case EXT3_IOC_GETVERSION_OLD:
	116	return put_user(inode->i_generation, (int __user *) arg);
	117	case EXT3_IOC_SETVERSION:
	118	case EXT3_IOC_SETVERSION_OLD: {
	119	handle_t *handle;
	120	struct ext3_iloc iloc;
	121	__u32 generation;
	122	int err;
	123
	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;
	130
	131	handle = ext3_journal_start(inode, 1);
	132	if (IS_ERR(handle))
	133	return PTR_ERR(handle);
	134	err = ext3_reserve_inode_write(handle, inode, &iloc);
	135	if (err == 0) {
	136	inode->i_ctime = CURRENT_TIME_SEC;
	137	inode->i_generation = generation;
	138	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
	139	}
	140	ext3_journal_stop(handle);
	141	return err;
	142	}
	143	#ifdef CONFIG_JBD_DEBUG
	144	case EXT3_IOC_WAIT_FOR_READONLY:
	145	/*
	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.
	149	*
	150	* Returns 1 if it slept, else zero.
	151	*/
	152	{
	153	struct super_block *sb = inode->i_sb;
	154	DECLARE_WAITQUEUE(wait, current);
	155	int ret = 0;
	156
	157	set_current_state(TASK_INTERRUPTIBLE);
	158	add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
	159	if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
	160	schedule();
	161	ret = 1;
	162	}
	163	remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
	164	return ret;
	165	}
	166	#endif
	167	case EXT3_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);
	173	}
	174	return -ENOTTY;
	175	case EXT3_IOC_SETRSVSZ: {
176
177	if (!test_opt(inode->i_sb, RESERVATION) \|\|!S_ISREG(inode->i_mode))
178	return -ENOTTY;
179
180	if (IS_RDONLY(inode))
181	return -EROFS;
182
183	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
184	return -EACCES;
185
186	if (get_user(rsv_window_size, (int __user *)arg))
187	return -EFAULT;
188
189	if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
190	rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
191
192	/*
193	* need to allocate reservation structure for this inode
194	* before set the window size
195	*/
97461518	196	mutex_lock(&ei->truncate_mutex);
1da177e4 LT	197	if (!ei->i_block_alloc_info)
	198	ext3_init_block_alloc_info(inode);
	199
	200	if (ei->i_block_alloc_info){
	201	struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
	202	rsv->rsv_goal_size = rsv_window_size;
	203	}
97461518	204	mutex_unlock(&ei->truncate_mutex);
1da177e4 LT	205	return 0;
	206	}
	207	case EXT3_IOC_GROUP_EXTEND: {
43d23f90	208	ext3_fsblk_t n_blocks_count;
1da177e4 LT	209	struct super_block *sb = inode->i_sb;
	210	int err;
	211
	212	if (!capable(CAP_SYS_RESOURCE))
	213	return -EPERM;
	214
	215	if (IS_RDONLY(inode))
	216	return -EROFS;
	217
	218	if (get_user(n_blocks_count, (__u32 __user *)arg))
	219	return -EFAULT;
	220
	221	err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
	222	journal_lock_updates(EXT3_SB(sb)->s_journal);
	223	journal_flush(EXT3_SB(sb)->s_journal);
	224	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	225
	226	return err;
	227	}
	228	case EXT3_IOC_GROUP_ADD: {
	229	struct ext3_new_group_data input;
	230	struct super_block *sb = inode->i_sb;
	231	int err;
	232
	233	if (!capable(CAP_SYS_RESOURCE))
	234	return -EPERM;
	235
	236	if (IS_RDONLY(inode))
	237	return -EROFS;
	238
	239	if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
	240	sizeof(input)))
	241	return -EFAULT;
	242
	243	err = ext3_group_add(sb, &input);
	244	journal_lock_updates(EXT3_SB(sb)->s_journal);
	245	journal_flush(EXT3_SB(sb)->s_journal);
	246	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	247
	248	return err;
	249	}
	250
	251
	252	default:
	253	return -ENOTTY;
	254	}
	255	}
52a700c5 DH	256
	257	#ifdef CONFIG_COMPAT
	258	long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	259	{
fe21a693	260	struct inode *inode = file->f_path.dentry->d_inode;
52a700c5 DH	261	int ret;
	262
	263	/* These are just misnamed, they actually get/put from/to user an int */
	264	switch (cmd) {
	265	case EXT3_IOC32_GETFLAGS:
	266	cmd = EXT3_IOC_GETFLAGS;
	267	break;
	268	case EXT3_IOC32_SETFLAGS:
	269	cmd = EXT3_IOC_SETFLAGS;
	270	break;
	271	case EXT3_IOC32_GETVERSION:
	272	cmd = EXT3_IOC_GETVERSION;
	273	break;
	274	case EXT3_IOC32_SETVERSION:
	275	cmd = EXT3_IOC_SETVERSION;
	276	break;
	277	case EXT3_IOC32_GROUP_EXTEND:
	278	cmd = EXT3_IOC_GROUP_EXTEND;
	279	break;
	280	case EXT3_IOC32_GETVERSION_OLD:
	281	cmd = EXT3_IOC_GETVERSION_OLD;
	282	break;
	283	case EXT3_IOC32_SETVERSION_OLD:
	284	cmd = EXT3_IOC_SETVERSION_OLD;
	285	break;
	286	#ifdef CONFIG_JBD_DEBUG
	287	case EXT3_IOC32_WAIT_FOR_READONLY:
	288	cmd = EXT3_IOC_WAIT_FOR_READONLY;
	289	break;
	290	#endif
	291	case EXT3_IOC32_GETRSVSZ:
	292	cmd = EXT3_IOC_GETRSVSZ;
	293	break;
	294	case EXT3_IOC32_SETRSVSZ:
	295	cmd = EXT3_IOC_SETRSVSZ;
	296	break;
	297	case EXT3_IOC_GROUP_ADD:
	298	break;
	299	default:
	300	return -ENOIOCTLCMD;
	301	}
	302	lock_kernel();
	303	ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	304	unlock_kernel();
	305	return ret;
	306	}
	307	#endif