From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?=
 <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 fs/jfs/acl.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 fs/jfs/acl.c

(limited to 'fs/jfs/acl.c')

diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
new file mode 100644
index 000000000..0c8ca830b
--- /dev/null
+++ b/fs/jfs/acl.c
@@ -0,0 +1,161 @@
+/*
+ *   Copyright (C) International Business Machines  Corp., 2002-2004
+ *   Copyright (C) Andreas Gruenbacher, 2001
+ *   Copyright (C) Linus Torvalds, 1991, 1992
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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 02111-1307 USA
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/posix_acl_xattr.h>
+#include "jfs_incore.h"
+#include "jfs_txnmgr.h"
+#include "jfs_xattr.h"
+#include "jfs_acl.h"
+
+struct posix_acl *jfs_get_acl(struct inode *inode, int type)
+{
+	struct posix_acl *acl;
+	char *ea_name;
+	int size;
+	char *value = NULL;
+
+	acl = get_cached_acl(inode, type);
+	if (acl != ACL_NOT_CACHED)
+		return acl;
+
+	switch(type) {
+		case ACL_TYPE_ACCESS:
+			ea_name = POSIX_ACL_XATTR_ACCESS;
+			break;
+		case ACL_TYPE_DEFAULT:
+			ea_name = POSIX_ACL_XATTR_DEFAULT;
+			break;
+		default:
+			return ERR_PTR(-EINVAL);
+	}
+
+	size = __jfs_getxattr(inode, ea_name, NULL, 0);
+
+	if (size > 0) {
+		value = kmalloc(size, GFP_KERNEL);
+		if (!value)
+			return ERR_PTR(-ENOMEM);
+		size = __jfs_getxattr(inode, ea_name, value, size);
+	}
+
+	if (size < 0) {
+		if (size == -ENODATA)
+			acl = NULL;
+		else
+			acl = ERR_PTR(size);
+	} else {
+		acl = posix_acl_from_xattr(&init_user_ns, value, size);
+	}
+	kfree(value);
+	if (!IS_ERR(acl))
+		set_cached_acl(inode, type, acl);
+	return acl;
+}
+
+static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
+		       struct posix_acl *acl)
+{
+	char *ea_name;
+	int rc;
+	int size = 0;
+	char *value = NULL;
+
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		ea_name = POSIX_ACL_XATTR_ACCESS;
+		if (acl) {
+			rc = posix_acl_equiv_mode(acl, &inode->i_mode);
+			if (rc < 0)
+				return rc;
+			inode->i_ctime = CURRENT_TIME;
+			mark_inode_dirty(inode);
+			if (rc == 0)
+				acl = NULL;
+		}
+		break;
+	case ACL_TYPE_DEFAULT:
+		ea_name = POSIX_ACL_XATTR_DEFAULT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (acl) {
+		size = posix_acl_xattr_size(acl->a_count);
+		value = kmalloc(size, GFP_KERNEL);
+		if (!value)
+			return -ENOMEM;
+		rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+		if (rc < 0)
+			goto out;
+	}
+	rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
+out:
+	kfree(value);
+
+	if (!rc)
+		set_cached_acl(inode, type, acl);
+
+	return rc;
+}
+
+int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+	int rc;
+	tid_t tid;
+
+	tid = txBegin(inode->i_sb, 0);
+	mutex_lock(&JFS_IP(inode)->commit_mutex);
+	rc = __jfs_set_acl(tid, inode, type, acl);
+	if (!rc)
+		rc = txCommit(tid, 1, &inode, 0);
+	txEnd(tid);
+	mutex_unlock(&JFS_IP(inode)->commit_mutex);
+	return rc;
+}
+
+int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
+{
+	struct posix_acl *default_acl, *acl;
+	int rc = 0;
+
+	rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
+	if (rc)
+		return rc;
+
+	if (default_acl) {
+		rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
+		posix_acl_release(default_acl);
+	}
+
+	if (acl) {
+		if (!rc)
+			rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
+		posix_acl_release(acl);
+	}
+
+	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
+			       inode->i_mode;
+
+	return rc;
+}
-- 
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