Release 4.17 fs/ext2/ioctl.c

// 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;

		/*
                 * 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) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				inode_unlock(inode);
				ret = -EPERM;
				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;
		}
		mutex_unlock(&ei->truncate_mutex);
		mnt_drop_write_file(filp);
		return 0;
	}
	default:
		return -ENOTTY;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
224
36.54%
15
44.12%
Martin J. Bligh
184
30.02%
1
2.94%
Dave Hansen
82
13.38%
1
2.94%
Djalal Harouni
29
4.73%
1
2.94%
Al Viro
19
3.10%
5
14.71%
Andrew Morton
19
3.10%
3
8.82%
Jan Kara
16
2.61%
1
2.94%
Linus Torvalds
13
2.12%
1
2.94%
Deepa Dinamani
8
1.31%
1
2.94%
Andi Kleen
8
1.31%
1
2.94%
Duane Griffin
5
0.82%
1
2.94%
Serge E. Hallyn
3
0.49%
1
2.94%
Satyam Sharma
2
0.33%
1
2.94%
Andreas Dilger
1
0.16%
1
2.94%
Total
613
100.00%
34
100.00%

#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));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
78
98.73%
1
50.00%
Andi Kleen
1
1.27%
1
50.00%
Total
79
100.00%
2
100.00%

#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
231
31.95%
18
41.86%
Martin J. Bligh
184
25.45%
1
2.33%
David Howells
86
11.89%
1
2.33%
Dave Hansen
85
11.76%
1
2.33%
Djalal Harouni
29
4.01%
1
2.33%
Andrew Morton
19
2.63%
3
6.98%
Al Viro
19
2.63%
5
11.63%
Jan Kara
16
2.21%
1
2.33%
Linus Torvalds
15
2.07%
2
4.65%
Andi Kleen
9
1.24%
1
2.33%
Deepa Dinamani
8
1.11%
1
2.33%
Arnaldo Carvalho de Melo
6
0.83%
1
2.33%
Duane Griffin
5
0.69%
1
2.33%
Randy Dunlap
3
0.41%
1
2.33%
Serge E. Hallyn
3
0.41%
1
2.33%
Satyam Sharma
2
0.28%
1
2.33%
Dave Jones
1
0.14%
1
2.33%
Greg Kroah-Hartman
1
0.14%
1
2.33%
Andreas Dilger
1
0.14%
1
2.33%
Total
723
100.00%
43
100.00%
Directory: fs/ext2

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