Release 4.16 fs/btrfs/acl.c

/*
 * Copyright (C) 2007 Red Hat.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/fs.h>
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/posix_acl.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include "ctree.h"
#include "btrfs_inode.h"
#include "xattr.h"



struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
{
	int size;
	const char *name;
	char *value = NULL;
	struct posix_acl *acl;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}

	size = __btrfs_getxattr(inode, name, "", 0);
	if (size > 0) {
		value = kzalloc(size, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		size = __btrfs_getxattr(inode, name, value, size);
	}
	if (size > 0) {
		acl = posix_acl_from_xattr(&init_user_ns, value, size);
	} else if (size == -ERANGE || size == -ENODATA || size == 0) {
		acl = NULL;
	} else {
		acl = ERR_PTR(-EIO);
	}
	kfree(value);

	return acl;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
87
49.15%
1
10.00%
Yan Zheng
43
24.29%
1
10.00%
Chris Mason
20
11.30%
1
10.00%
Christoph Hellwig
11
6.21%
1
10.00%
Tsutomu Itoh
6
3.39%
1
10.00%
Al Viro
3
1.69%
1
10.00%
Eric W. Biedermann
3
1.69%
1
10.00%
Andreas Gruenbacher
2
1.13%
1
10.00%
Salah Triki
1
0.56%
1
10.00%
David Sterba
1
0.56%
1
10.00%
Total
177
100.00%
10
100.00%

/*
 * Needs to be called with fs_mutex held
 */


static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
			 struct inode *inode, struct posix_acl *acl, int type)
{
	int ret, size = 0;
	const char *name;
	char *value = NULL;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EINVAL : 0;
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		size = posix_acl_xattr_size(acl->a_count);
		value = kmalloc(size, GFP_KERNEL);
		if (!value) {
			ret = -ENOMEM;
			goto out;
		}

		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
		if (ret < 0)
			goto out;
	}

	ret = __btrfs_setxattr(trans, inode, name, value, size, 0);
out:
	kfree(value);

	if (!ret)
		set_cached_acl(inode, type, acl);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
158
83.16%
3
25.00%
Christoph Hellwig
9
4.74%
2
16.67%
Zheng Yan
7
3.68%
1
8.33%
Yan Zheng
5
2.63%
1
8.33%
Chris Mason
3
1.58%
1
8.33%
Eric W. Biedermann
3
1.58%
1
8.33%
Al Viro
2
1.05%
1
8.33%
Andreas Gruenbacher
2
1.05%
1
8.33%
David Sterba
1
0.53%
1
8.33%
Total
190
100.00%
12
100.00%



int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int ret;
	umode_t old_mode = inode->i_mode;

	if (type == ACL_TYPE_ACCESS && acl) {
		ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
		if (ret)
			return ret;
	}
	ret = __btrfs_set_acl(NULL, inode, acl, type);
	if (ret)
		inode->i_mode = old_mode;
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Kara
35
40.70%
1
16.67%
Ernesto A. Fernández
22
25.58%
1
16.67%
Josef Bacik
15
17.44%
1
16.67%
Christoph Hellwig
12
13.95%
2
33.33%
Zheng Yan
2
2.33%
1
16.67%
Total
86
100.00%
6
100.00%

/*
 * btrfs_init_acl is already generally called under fs_mutex, so the locking
 * stuff has been fixed to work with that.  If the locking stuff changes, we
 * need to re-evaluate the acl locking stuff.
 */


int btrfs_init_acl(struct btrfs_trans_handle *trans,
		   struct inode *inode, struct inode *dir)
{
	struct posix_acl *default_acl, *acl;
	int ret = 0;

	/* this happens with subvols */
	if (!dir)
		return 0;

	ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
	if (ret)
		return ret;

	if (default_acl) {
		ret = __btrfs_set_acl(trans, inode, default_acl,
				      ACL_TYPE_DEFAULT);
		posix_acl_release(default_acl);
	}

	if (acl) {
		if (!ret)
			ret = __btrfs_set_acl(trans, inode, acl,
					      ACL_TYPE_ACCESS);
		posix_acl_release(acl);
	}

	if (!default_acl && !acl)
		cache_no_acl(inode);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
95
69.85%
3
50.00%
Christoph Hellwig
30
22.06%
1
16.67%
Zheng Yan
7
5.15%
1
16.67%
Al Viro
4
2.94%
1
16.67%
Total
136
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Josef Bacik
382
61.41%
4
18.18%
Christoph Hellwig
62
9.97%
3
13.64%
Yan Zheng
48
7.72%
1
4.55%
Jan Kara
35
5.63%
1
4.55%
Chris Mason
26
4.18%
3
13.64%
Ernesto A. Fernández
22
3.54%
1
4.55%
Zheng Yan
16
2.57%
1
4.55%
Al Viro
9
1.45%
2
9.09%
Eric W. Biedermann
6
0.96%
1
4.55%
Tsutomu Itoh
6
0.96%
1
4.55%
Andreas Gruenbacher
4
0.64%
1
4.55%
Tejun Heo
3
0.48%
1
4.55%
David Sterba
2
0.32%
1
4.55%
Salah Triki
1
0.16%
1
4.55%
Total
622
100.00%
22
100.00%
Directory: fs/btrfs

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