fs/ext3/ioctl.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * 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/mount.h>
 #include <linux/compat.h>
 #include <asm/uaccess.h>
 #include "ext3.h"

 long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
 	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 (!inode_owner_or_capable(inode))
 			return -EACCES;

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

 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;

 		flags = ext3_mask_flags(inode->i_mode, flags);

 		mutex_lock(&inode->i_mutex);

 		/* Is it quota file? Do not allow user to mess with it */
 		err = -EPERM;
 		if (IS_NOQUOTA(inode))
 			goto flags_out;

 		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))
 				goto flags_out;
 		}

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

 		handle = ext3_journal_start(inode, 1);
 		if (IS_ERR(handle)) {
 			err = PTR_ERR(handle);
 			goto flags_out;
 		}
 		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)
 			goto flags_out;

 		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
 			err = ext3_change_inode_journal_flag(inode, jflag);
 flags_out:
 		mutex_unlock(&inode->i_mutex);
 		mnt_drop_write_file(filp);
 		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 (!inode_owner_or_capable(inode))
 			return -EPERM;

 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;
 		if (get_user(generation, (int __user *) arg)) {
 			err = -EFAULT;
 			goto setversion_out;
 		}

 		mutex_lock(&inode->i_mutex);
 		handle = ext3_journal_start(inode, 1);
 		if (IS_ERR(handle)) {
 			err = PTR_ERR(handle);
 			goto unlock_out;
 		}
 		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);

 unlock_out:
 		mutex_unlock(&inode->i_mutex);
 setversion_out:
 		mnt_drop_write_file(filp);
 		return err;
 	}
 	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: {
 		int err;

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

 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;

 		if (!inode_owner_or_capable(inode)) {
 			err = -EACCES;
 			goto setrsvsz_out;
 		}

 		if (get_user(rsv_window_size, (int __user *)arg)) {
 			err = -EFAULT;
 			goto setrsvsz_out;
 		}

 		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);
 setrsvsz_out:
 		mnt_drop_write_file(filp);
 		return err;
 	}
 	case EXT3_IOC_GROUP_EXTEND: {
 		ext3_fsblk_t n_blocks_count;
 		struct super_block *sb = inode->i_sb;
 		int err, err2;

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

 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;

 		if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 			err = -EFAULT;
 			goto group_extend_out;
 		}
 		err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
 		journal_lock_updates(EXT3_SB(sb)->s_journal);
 		err2 = journal_flush(EXT3_SB(sb)->s_journal);
 		journal_unlock_updates(EXT3_SB(sb)->s_journal);
 		if (err == 0)
 			err = err2;
 group_extend_out:
 		mnt_drop_write_file(filp);
 		return err;
 	}
 	case EXT3_IOC_GROUP_ADD: {
 		struct ext3_new_group_data input;
 		struct super_block *sb = inode->i_sb;
 		int err, err2;

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

 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;

 		if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
 				sizeof(input))) {
 			err = -EFAULT;
 			goto group_add_out;
 		}

 		err = ext3_group_add(sb, &input);
 		journal_lock_updates(EXT3_SB(sb)->s_journal);
 		err2 = journal_flush(EXT3_SB(sb)->s_journal);
 		journal_unlock_updates(EXT3_SB(sb)->s_journal);
 		if (err == 0)
 			err = err2;
 group_add_out:
 		mnt_drop_write_file(filp);
 		return err;
 	}
 	case FITRIM: {

 		struct super_block *sb = inode->i_sb;
 		struct fstrim_range range;
 		int ret = 0;

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

 		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 				   sizeof(range)))
 			return -EFAULT;

 		ret = ext3_trim_fs(sb, &range);
 		if (ret < 0)
 			return ret;

 		if (copy_to_user((struct fstrim_range __user *)arg, &range,
 				 sizeof(range)))
 			return -EFAULT;

 		return 0;
 	}

 	default:
 		return -ENOTTY;
 	}
 }

 #ifdef CONFIG_COMPAT
 long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	/* 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;
 	}
 	return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 }
 #endif
	/*
	* 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/mount.h>
	#include <linux/compat.h>
	#include <asm/uaccess.h>
	#include "ext3.h"

	long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	{
	struct inode *inode = file_inode(filp);
	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 (!inode_owner_or_capable(inode))
	return -EACCES;

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

	err = mnt_want_write_file(filp);
	if (err)
	return err;

	flags = ext3_mask_flags(inode->i_mode, flags);

	mutex_lock(&inode->i_mutex);

	/* Is it quota file? Do not allow user to mess with it */
	err = -EPERM;
	if (IS_NOQUOTA(inode))
	goto flags_out;

	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))
	goto flags_out;
	}

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

	handle = ext3_journal_start(inode, 1);
	if (IS_ERR(handle)) {
	err = PTR_ERR(handle);
	goto flags_out;
	}
	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)
	goto flags_out;

	if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
	err = ext3_change_inode_journal_flag(inode, jflag);
	flags_out:
	mutex_unlock(&inode->i_mutex);
	mnt_drop_write_file(filp);
	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 (!inode_owner_or_capable(inode))
	return -EPERM;

	err = mnt_want_write_file(filp);
	if (err)
	return err;
	if (get_user(generation, (int __user *) arg)) {
	err = -EFAULT;
	goto setversion_out;
	}

	mutex_lock(&inode->i_mutex);
	handle = ext3_journal_start(inode, 1);
	if (IS_ERR(handle)) {
	err = PTR_ERR(handle);
	goto unlock_out;
	}
	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);

	unlock_out:
	mutex_unlock(&inode->i_mutex);
	setversion_out:
	mnt_drop_write_file(filp);
	return err;
	}
	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: {
	int err;

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

	err = mnt_want_write_file(filp);
	if (err)
	return err;

	if (!inode_owner_or_capable(inode)) {
	err = -EACCES;
	goto setrsvsz_out;
	}

	if (get_user(rsv_window_size, (int __user *)arg)) {
	err = -EFAULT;
	goto setrsvsz_out;
	}

	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);
	setrsvsz_out:
	mnt_drop_write_file(filp);
	return err;
	}
	case EXT3_IOC_GROUP_EXTEND: {
	ext3_fsblk_t n_blocks_count;
	struct super_block *sb = inode->i_sb;
	int err, err2;

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

	err = mnt_want_write_file(filp);
	if (err)
	return err;

	if (get_user(n_blocks_count, (__u32 __user *)arg)) {
	err = -EFAULT;
	goto group_extend_out;
	}
	err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
	journal_lock_updates(EXT3_SB(sb)->s_journal);
	err2 = journal_flush(EXT3_SB(sb)->s_journal);
	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	if (err == 0)
	err = err2;
	group_extend_out:
	mnt_drop_write_file(filp);
	return err;
	}
	case EXT3_IOC_GROUP_ADD: {
	struct ext3_new_group_data input;
	struct super_block *sb = inode->i_sb;
	int err, err2;

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

	err = mnt_want_write_file(filp);
	if (err)
	return err;

	if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
	sizeof(input))) {
	err = -EFAULT;
	goto group_add_out;
	}

	err = ext3_group_add(sb, &input);
	journal_lock_updates(EXT3_SB(sb)->s_journal);
	err2 = journal_flush(EXT3_SB(sb)->s_journal);
	journal_unlock_updates(EXT3_SB(sb)->s_journal);
	if (err == 0)
	err = err2;
	group_add_out:
	mnt_drop_write_file(filp);
	return err;
	}
	case FITRIM: {

	struct super_block *sb = inode->i_sb;
	struct fstrim_range range;
	int ret = 0;

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

	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
	sizeof(range)))
	return -EFAULT;

	ret = ext3_trim_fs(sb, &range);
	if (ret < 0)
	return ret;

	if (copy_to_user((struct fstrim_range __user *)arg, &range,
	sizeof(range)))
	return -EFAULT;

	return 0;
	}

	default:
	return -ENOTTY;
	}
	}

	#ifdef CONFIG_COMPAT
	long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	{
	/* 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;
	}
	return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	}
	#endif