[net-next-2.6.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 <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:
		ext3_get_inode_flags(ei);
		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 (!is_owner_or_cap(inode))
			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 (!is_owner_or_cap(inode))
			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 (!is_owner_or_cap(inode))
			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 (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>
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:
28be5abb	31	ext3_get_inode_flags(ei);
1da177e4 LT	32	flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
	33	return put_user(flags, (int __user *) arg);
	34	case EXT3_IOC_SETFLAGS: {
	35	handle_t *handle = NULL;
	36	int err;
	37	struct ext3_iloc iloc;
	38	unsigned int oldflags;
	39	unsigned int jflag;
	40
	41	if (IS_RDONLY(inode))
	42	return -EROFS;
	43
3bd858ab	44	if (!is_owner_or_cap(inode))
1da177e4 LT	45	return -EACCES;
	46
	47	if (get_user(flags, (int __user *) arg))
	48	return -EFAULT;
	49
	50	if (!S_ISDIR(inode->i_mode))
	51	flags &= ~EXT3_DIRSYNC_FL;
	52
a090d913	53	mutex_lock(&inode->i_mutex);
1da177e4 LT	54	oldflags = ei->i_flags;
	55
	56	/* The JOURNAL_DATA flag is modifiable only by root */
	57	jflag = flags & EXT3_JOURNAL_DATA_FL;
	58
	59	/*
	60	* The IMMUTABLE and APPEND_ONLY flags can only be changed by
	61	* the relevant capability.
	62	*
	63	* This test looks nicer. Thanks to Pauline Middelink
	64	*/
	65	if ((flags ^ oldflags) & (EXT3_APPEND_FL \| EXT3_IMMUTABLE_FL)) {
a090d913 AV	66	if (!capable(CAP_LINUX_IMMUTABLE)) {
a090d913 AV	67	mutex_unlock(&inode->i_mutex);
1da177e4	68	return -EPERM;
a090d913	69	}
1da177e4 LT	70	}
	71
	72	/*
	73	* The JOURNAL_DATA flag can only be changed by
	74	* the relevant capability.
	75	*/
	76	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
a090d913 AV	77	if (!capable(CAP_SYS_RESOURCE)) {
a090d913 AV	78	mutex_unlock(&inode->i_mutex);
1da177e4	79	return -EPERM;
a090d913	80	}
1da177e4 LT	81	}
	82
	83
	84	handle = ext3_journal_start(inode, 1);
a090d913 AV	85	if (IS_ERR(handle)) {
a090d913 AV	86	mutex_unlock(&inode->i_mutex);
1da177e4	87	return PTR_ERR(handle);
a090d913	88	}
1da177e4 LT	89	if (IS_SYNC(inode))
	90	handle->h_sync = 1;
	91	err = ext3_reserve_inode_write(handle, inode, &iloc);
	92	if (err)
	93	goto flags_err;
	94
	95	flags = flags & EXT3_FL_USER_MODIFIABLE;
	96	flags \|= oldflags & ~EXT3_FL_USER_MODIFIABLE;
	97	ei->i_flags = flags;
	98
	99	ext3_set_inode_flags(inode);
	100	inode->i_ctime = CURRENT_TIME_SEC;
	101
	102	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
	103	flags_err:
	104	ext3_journal_stop(handle);
a090d913 AV	105	if (err) {
a090d913 AV	106	mutex_unlock(&inode->i_mutex);
1da177e4	107	return err;
a090d913	108	}
1da177e4 LT	109
	110	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
	111	err = ext3_change_inode_journal_flag(inode, jflag);
a090d913	112	mutex_unlock(&inode->i_mutex);
1da177e4 LT	113	return err;
	114	}
	115	case EXT3_IOC_GETVERSION:
	116	case EXT3_IOC_GETVERSION_OLD:
	117	return put_user(inode->i_generation, (int __user *) arg);
	118	case EXT3_IOC_SETVERSION:
	119	case EXT3_IOC_SETVERSION_OLD: {
	120	handle_t *handle;
	121	struct ext3_iloc iloc;
	122	__u32 generation;
	123	int err;
	124
3bd858ab	125	if (!is_owner_or_cap(inode))
1da177e4 LT	126	return -EPERM;
	127	if (IS_RDONLY(inode))
	128	return -EROFS;
	129	if (get_user(generation, (int __user *) arg))
	130	return -EFAULT;
	131
	132	handle = ext3_journal_start(inode, 1);
	133	if (IS_ERR(handle))
	134	return PTR_ERR(handle);
	135	err = ext3_reserve_inode_write(handle, inode, &iloc);
	136	if (err == 0) {
	137	inode->i_ctime = CURRENT_TIME_SEC;
	138	inode->i_generation = generation;
	139	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
	140	}
	141	ext3_journal_stop(handle);
	142	return err;
	143	}
	144	#ifdef CONFIG_JBD_DEBUG
	145	case EXT3_IOC_WAIT_FOR_READONLY:
	146	/*
	147	* This is racy - by the time we're woken up and running,
	148	* the superblock could be released. And the module could
	149	* have been unloaded. So sue me.
	150	*
	151	* Returns 1 if it slept, else zero.
	152	*/
	153	{
	154	struct super_block *sb = inode->i_sb;
	155	DECLARE_WAITQUEUE(wait, current);
	156	int ret = 0;
	157
	158	set_current_state(TASK_INTERRUPTIBLE);
	159	add_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
	160	if (timer_pending(&EXT3_SB(sb)->turn_ro_timer)) {
	161	schedule();
	162	ret = 1;
	163	}
	164	remove_wait_queue(&EXT3_SB(sb)->ro_wait_queue, &wait);
	165	return ret;
	166	}
	167	#endif
	168	case EXT3_IOC_GETRSVSZ:
	169	if (test_opt(inode->i_sb, RESERVATION)
	170	&& S_ISREG(inode->i_mode)
	171	&& ei->i_block_alloc_info) {
	172	rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
	173	return put_user(rsv_window_size, (int __user *)arg);
	174	}
	175	return -ENOTTY;
	176	case EXT3_IOC_SETRSVSZ: {
	177
	178	if (!test_opt(inode->i_sb, RESERVATION) \|\|!S_ISREG(inode->i_mode))
	179	return -ENOTTY;
	180
	181	if (IS_RDONLY(inode))
	182	return -EROFS;
	183
3bd858ab	184	if (!is_owner_or_cap(inode))
1da177e4 LT	185	return -EACCES;
	186
	187	if (get_user(rsv_window_size, (int __user *)arg))
	188	return -EFAULT;
	189
	190	if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
	191	rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
	192
	193	/*
	194	* need to allocate reservation structure for this inode
	195	* before set the window size
	196	*/
97461518	197	mutex_lock(&ei->truncate_mutex);
1da177e4 LT	198	if (!ei->i_block_alloc_info)
	199	ext3_init_block_alloc_info(inode);
	200
	201	if (ei->i_block_alloc_info){
	202	struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
	203	rsv->rsv_goal_size = rsv_window_size;
	204	}
97461518	205	mutex_unlock(&ei->truncate_mutex);
1da177e4 LT	206	return 0;
	207	}
	208	case EXT3_IOC_GROUP_EXTEND: {
43d23f90	209	ext3_fsblk_t n_blocks_count;
1da177e4 LT	210	struct super_block *sb = inode->i_sb;
	211	int err;
	212
	213	if (!capable(CAP_SYS_RESOURCE))
	214	return -EPERM;
	215
	216	if (IS_RDONLY(inode))
	217	return -EROFS;
	218
	219	if (get_user(n_blocks_count, (__u32 __user *)arg))
	220	return -EFAULT;
	221
	222	err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
	223	journal_lock_updates(EXT3_SB(sb)->s_journal);
	224	journal_flush(EXT3_SB(sb)->s_journal);
	225	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	226
	227	return err;
	228	}
	229	case EXT3_IOC_GROUP_ADD: {
	230	struct ext3_new_group_data input;
	231	struct super_block *sb = inode->i_sb;
	232	int err;
	233
	234	if (!capable(CAP_SYS_RESOURCE))
	235	return -EPERM;
	236
	237	if (IS_RDONLY(inode))
	238	return -EROFS;
	239
	240	if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
	241	sizeof(input)))
	242	return -EFAULT;
	243
	244	err = ext3_group_add(sb, &input);
	245	journal_lock_updates(EXT3_SB(sb)->s_journal);
	246	journal_flush(EXT3_SB(sb)->s_journal);
	247	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	248
	249	return err;
	250	}
	251
	252
	253	default:
	254	return -ENOTTY;
	255	}
	256	}
52a700c5 DH	257
	258	#ifdef CONFIG_COMPAT
	259	long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	260	{
fe21a693	261	struct inode *inode = file->f_path.dentry->d_inode;
52a700c5 DH	262	int ret;
	263
	264	/* These are just misnamed, they actually get/put from/to user an int */
	265	switch (cmd) {
	266	case EXT3_IOC32_GETFLAGS:
	267	cmd = EXT3_IOC_GETFLAGS;
	268	break;
	269	case EXT3_IOC32_SETFLAGS:
	270	cmd = EXT3_IOC_SETFLAGS;
	271	break;
	272	case EXT3_IOC32_GETVERSION:
	273	cmd = EXT3_IOC_GETVERSION;
	274	break;
	275	case EXT3_IOC32_SETVERSION:
	276	cmd = EXT3_IOC_SETVERSION;
	277	break;
	278	case EXT3_IOC32_GROUP_EXTEND:
	279	cmd = EXT3_IOC_GROUP_EXTEND;
	280	break;
	281	case EXT3_IOC32_GETVERSION_OLD:
	282	cmd = EXT3_IOC_GETVERSION_OLD;
	283	break;
	284	case EXT3_IOC32_SETVERSION_OLD:
	285	cmd = EXT3_IOC_SETVERSION_OLD;
	286	break;
	287	#ifdef CONFIG_JBD_DEBUG
	288	case EXT3_IOC32_WAIT_FOR_READONLY:
	289	cmd = EXT3_IOC_WAIT_FOR_READONLY;
	290	break;
	291	#endif
	292	case EXT3_IOC32_GETRSVSZ:
	293	cmd = EXT3_IOC_GETRSVSZ;
	294	break;
	295	case EXT3_IOC32_SETRSVSZ:
	296	cmd = EXT3_IOC_SETRSVSZ;
	297	break;
	298	case EXT3_IOC_GROUP_ADD:
	299	break;
	300	default:
	301	return -ENOIOCTLCMD;
	302	}
	303	lock_kernel();
	304	ret = ext3_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
	305	unlock_kernel();
	306	return ret;
	307	}
	308	#endif