// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/ext4/xattr_security.c
 * Handler for storing security labels as extended attributes.
 */

#include <linux/string.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/slab.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"

static int
ext4_xattr_security_get(const struct xattr_handler *handler,
                        struct dentry *unused, struct inode *inode,
                        const char *name, void *buffer, size_t size)
{
        return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
                              name, buffer, size);
}

static int
ext4_xattr_security_set(const struct xattr_handler *handler,
                        struct mnt_idmap *idmap,
                        struct dentry *unused, struct inode *inode,
                        const char *name, const void *value,
                        size_t size, int flags)
{
        return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
                              name, value, size, flags);
}

static int
ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
                void *fs_info)
{
        const struct xattr *xattr;
        handle_t *handle = fs_info;
        int err = 0;

        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
                err = ext4_xattr_set_handle(handle, inode,
                                            EXT4_XATTR_INDEX_SECURITY,
                                            xattr->name, xattr->value,
                                            xattr->value_len, XATTR_CREATE);
                if (err < 0)
                        break;
        }
        return err;
}

int
ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
                   const struct qstr *qstr)
{
        return security_inode_init_security(inode, dir, qstr,
                                            &ext4_initxattrs, handle);
}

const struct xattr_handler ext4_xattr_security_handler = {
        .prefix = XATTR_SECURITY_PREFIX,
        .get    = ext4_xattr_security_get,
        .set    = ext4_xattr_security_set,
};