init android origin source code

1 files changed, 312 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/gfs2/acl.c b/ANDROID_3.4.5/fs/gfs2/acl.c
new file mode 100644
index 00000000..230eb0f0
--- /dev/null
+++ b/ANDROID_3.4.5/fs/gfs2/acl.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/gfs2_ondisk.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "xattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+
+static const char *gfs2_acl_name(int type)
+{
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		return GFS2_POSIX_ACL_ACCESS;
+	case ACL_TYPE_DEFAULT:
+		return GFS2_POSIX_ACL_DEFAULT;
+	}
+	return NULL;
+}
+
+struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct posix_acl *acl;
+	const char *name;
+	char *data;
+	int len;
+
+	if (!ip->i_eattr)
+		return NULL;
+
+	acl = get_cached_acl(&ip->i_inode, type);
+	if (acl != ACL_NOT_CACHED)
+		return acl;
+
+	name = gfs2_acl_name(type);
+	if (name == NULL)
+		return ERR_PTR(-EINVAL);
+
+	len = gfs2_xattr_acl_get(ip, name, &data);
+	if (len < 0)
+		return ERR_PTR(len);
+	if (len == 0)
+		return NULL;
+
+	acl = posix_acl_from_xattr(data, len);
+	kfree(data);
+	return acl;
+}
+
+static int gfs2_set_mode(struct inode *inode, umode_t mode)
+{
+	int error = 0;
+
+	if (mode != inode->i_mode) {
+		struct iattr iattr;
+
+		iattr.ia_valid = ATTR_MODE;
+		iattr.ia_mode = mode;
+
+		error = gfs2_setattr_simple(inode, &iattr);
+	}
+
+	return error;
+}
+
+static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
+{
+	int error;
+	int len;
+	char *data;
+	const char *name = gfs2_acl_name(type);
+
+	BUG_ON(name == NULL);
+	len = posix_acl_to_xattr(acl, NULL, 0);
+	if (len == 0)
+		return 0;
+	data = kmalloc(len, GFP_NOFS);
+	if (data == NULL)
+		return -ENOMEM;
+	error = posix_acl_to_xattr(acl, data, len);
+	if (error < 0)
+		goto out;
+	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
+	if (!error)
+		set_cached_acl(inode, type, acl);
+out:
+	kfree(data);
+	return error;
+}
+
+int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+	struct posix_acl *acl;
+	umode_t mode = inode->i_mode;
+	int error = 0;
+
+	if (!sdp->sd_args.ar_posix_acl)
+		return 0;
+	if (S_ISLNK(inode->i_mode))
+		return 0;
+
+	acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT);
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+	if (!acl) {
+		mode &= ~current_umask();
+		if (mode != inode->i_mode)
+			error = gfs2_set_mode(inode, mode);
+		return error;
+	}
+
+	if (S_ISDIR(inode->i_mode)) {
+		error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
+		if (error)
+			goto out;
+	}
+
+	error = posix_acl_create(&acl, GFP_NOFS, &mode);
+	if (error < 0)
+		return error;
+
+	if (error == 0)
+		goto munge;
+
+	error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
+	if (error)
+		goto out;
+munge:
+	error = gfs2_set_mode(inode, mode);
+out:
+	posix_acl_release(acl);
+	return error;
+}
+
+int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
+{
+	struct inode *inode = &ip->i_inode;
+	struct posix_acl *acl;
+	char *data;
+	unsigned int len;
+	int error;
+
+	acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS);
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+	if (!acl)
+		return gfs2_setattr_simple(inode, attr);
+
+	error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
+	if (error)
+		return error;
+
+	len = posix_acl_to_xattr(acl, NULL, 0);
+	data = kmalloc(len, GFP_NOFS);
+	error = -ENOMEM;
+	if (data == NULL)
+		goto out;
+	posix_acl_to_xattr(acl, data, len);
+	error = gfs2_xattr_acl_chmod(ip, attr, data);
+	kfree(data);
+	set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
+
+out:
+	posix_acl_release(acl);
+	return error;
+}
+
+static int gfs2_acl_type(const char *name)
+{
+	if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
+		return ACL_TYPE_ACCESS;
+	if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
+		return ACL_TYPE_DEFAULT;
+	return -EINVAL;
+}
+
+static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
+				 void *buffer, size_t size, int xtype)
+{
+	struct inode *inode = dentry->d_inode;
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	struct posix_acl *acl;
+	int type;
+	int error;
+
+	if (!sdp->sd_args.ar_posix_acl)
+		return -EOPNOTSUPP;
+
+	type = gfs2_acl_type(name);
+	if (type < 0)
+		return type;
+
+	acl = gfs2_get_acl(inode, type);
+	if (IS_ERR(acl))
+		return PTR_ERR(acl);
+	if (acl == NULL)
+		return -ENODATA;
+
+	error = posix_acl_to_xattr(acl, buffer, size);
+	posix_acl_release(acl);
+
+	return error;
+}
+
+static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
+				 const void *value, size_t size, int flags,
+				 int xtype)
+{
+	struct inode *inode = dentry->d_inode;
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	struct posix_acl *acl = NULL;
+	int error = 0, type;
+
+	if (!sdp->sd_args.ar_posix_acl)
+		return -EOPNOTSUPP;
+
+	type = gfs2_acl_type(name);
+	if (type < 0)
+		return type;
+	if (flags & XATTR_CREATE)
+		return -EINVAL;
+	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
+		return value ? -EACCES : 0;
+	if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
+		return -EPERM;
+	if (S_ISLNK(inode->i_mode))
+		return -EOPNOTSUPP;
+
+	if (!value)
+		goto set_acl;
+
+	acl = posix_acl_from_xattr(value, size);
+	if (!acl) {
+		/*
+		 * acl_set_file(3) may request that we set default ACLs with
+		 * zero length -- defend (gracefully) against that here.
+		 */
+		goto out;
+	}
+	if (IS_ERR(acl)) {
+		error = PTR_ERR(acl);
+		goto out;
+	}
+
+	error = posix_acl_valid(acl);
+	if (error)
+		goto out_release;
+
+	error = -EINVAL;
+	if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
+		goto out_release;
+
+	if (type == ACL_TYPE_ACCESS) {
+		umode_t mode = inode->i_mode;
+		error = posix_acl_equiv_mode(acl, &mode);
+
+		if (error <= 0) {
+			posix_acl_release(acl);
+			acl = NULL;
+
+			if (error < 0)
+				return error;
+		}
+
+		error = gfs2_set_mode(inode, mode);
+		if (error)
+			goto out_release;
+	}
+
+set_acl:
+	error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
+	if (!error) {
+		if (acl)
+			set_cached_acl(inode, type, acl);
+		else
+			forget_cached_acl(inode, type);
+	}
+out_release:
+	posix_acl_release(acl);
+out:
+	return error;
+}
+
+const struct xattr_handler gfs2_xattr_system_handler = {
+	.prefix = XATTR_SYSTEM_PREFIX,
+	.flags  = GFS2_EATYPE_SYS,
+	.get    = gfs2_xattr_system_get,
+	.set    = gfs2_xattr_system_set,
+};
+