Contributors: 21
Author Tokens Token Proportion Commits Commit Proportion
Linus Torvalds (pre-git) 209 29.19% 17 38.64%
Martin J. Bligh 183 25.56% 1 2.27%
David Howells 86 12.01% 1 2.27%
Dave Hansen 82 11.45% 1 2.27%
Djalal Harouni 29 4.05% 1 2.27%
Al Viro 19 2.65% 5 11.36%
Andrew Morton 18 2.51% 3 6.82%
Jan Kara 16 2.23% 1 2.27%
Linus Torvalds 15 2.09% 2 4.55%
Darrick J. Wong 11 1.54% 1 2.27%
Andi Kleen 9 1.26% 1 2.27%
Chengguang Xu 9 1.26% 1 2.27%
Deepa Dinamani 8 1.12% 1 2.27%
Arnaldo Carvalho de Melo 6 0.84% 1 2.27%
Duane Griffin 5 0.70% 1 2.27%
Serge E. Hallyn 3 0.42% 1 2.27%
Randy Dunlap 3 0.42% 1 2.27%
Satyam Sharma 2 0.28% 1 2.27%
Dave Jones 1 0.14% 1 2.27%
Greg Kroah-Hartman 1 0.14% 1 2.27%
Andreas Dilger 1 0.14% 1 2.27%
Total 716 44 
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// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/ext2/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 "ext2.h"
#include <linux/capability.h>
#include <linux/time.h>
#include <linux/sched.h>
#include <linux/compat.h>
#include <linux/mount.h>
#include <asm/current.h>
#include <linux/uaccess.h>


long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct ext2_inode_info *ei = EXT2_I(inode);
	unsigned int flags;
	unsigned short rsv_window_size;
	int ret;

	ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);

	switch (cmd) {
	case EXT2_IOC_GETFLAGS:
		flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case EXT2_IOC_SETFLAGS: {
		unsigned int oldflags;

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

		if (!inode_owner_or_capable(inode)) {
			ret = -EACCES;
			goto setflags_out;
		}

		if (get_user(flags, (int __user *) arg)) {
			ret = -EFAULT;
			goto setflags_out;
		}

		flags = ext2_mask_flags(inode->i_mode, flags);

		inode_lock(inode);
		/* Is it quota file? Do not allow user to mess with it */
		if (IS_NOQUOTA(inode)) {
			inode_unlock(inode);
			ret = -EPERM;
			goto setflags_out;
		}
		oldflags = ei->i_flags;

		ret = vfs_ioc_setflags_prepare(inode, oldflags, flags);
		if (ret) {
			inode_unlock(inode);
			goto setflags_out;
		}

		flags = flags & EXT2_FL_USER_MODIFIABLE;
		flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
		ei->i_flags = flags;

		ext2_set_inode_flags(inode);
		inode->i_ctime = current_time(inode);
		inode_unlock(inode);

		mark_inode_dirty(inode);
setflags_out:
		mnt_drop_write_file(filp);
		return ret;
	}
	case EXT2_IOC_GETVERSION:
		return put_user(inode->i_generation, (int __user *) arg);
	case EXT2_IOC_SETVERSION: {
		__u32 generation;

		if (!inode_owner_or_capable(inode))
			return -EPERM;
		ret = mnt_want_write_file(filp);
		if (ret)
			return ret;
		if (get_user(generation, (int __user *) arg)) {
			ret = -EFAULT;
			goto setversion_out;
		}

		inode_lock(inode);
		inode->i_ctime = current_time(inode);
		inode->i_generation = generation;
		inode_unlock(inode);

		mark_inode_dirty(inode);
setversion_out:
		mnt_drop_write_file(filp);
		return ret;
	}
	case EXT2_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 EXT2_IOC_SETRSVSZ: {

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

		if (!inode_owner_or_capable(inode))
			return -EACCES;

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

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

		if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS)
			rsv_window_size = EXT2_MAX_RESERVE_BLOCKS;

		/*
		 * need to allocate reservation structure for this inode
		 * before set the window size
		 */
		/*
		 * XXX What lock should protect the rsv_goal_size?
		 * Accessed in ext2_get_block only.  ext3 uses i_truncate.
		 */
		mutex_lock(&ei->truncate_mutex);
		if (!ei->i_block_alloc_info)
			ext2_init_block_alloc_info(inode);

		if (ei->i_block_alloc_info){
			struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
			rsv->rsv_goal_size = rsv_window_size;
		} else {
			ret = -ENOMEM;
		}

		mutex_unlock(&ei->truncate_mutex);
		mnt_drop_write_file(filp);
		return ret;
	}
	default:
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
long ext2_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 EXT2_IOC32_GETFLAGS:
		cmd = EXT2_IOC_GETFLAGS;
		break;
	case EXT2_IOC32_SETFLAGS:
		cmd = EXT2_IOC_SETFLAGS;
		break;
	case EXT2_IOC32_GETVERSION:
		cmd = EXT2_IOC_GETVERSION;
		break;
	case EXT2_IOC32_SETVERSION:
		cmd = EXT2_IOC_SETVERSION;
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif