xattr.h
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/* SPDX-License-Identifier: GPL-2.0
*
* linux/drivers/staging/erofs/xattr.h
*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <gaoxiang25@huawei.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of the Linux
* distribution for more details.
*/
#ifndef __EROFS_XATTR_H
#define __EROFS_XATTR_H
#include "internal.h"
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
/* Attribute not found */
#define ENOATTR ENODATA
static inline unsigned inlinexattr_header_size(struct inode *inode)
{
return sizeof(struct erofs_xattr_ibody_header)
+ sizeof(u32) * EROFS_V(inode)->xattr_shared_count;
}
static inline erofs_blk_t
xattrblock_addr(struct erofs_sb_info *sbi, unsigned xattr_id)
{
#ifdef CONFIG_EROFS_FS_XATTR
return sbi->xattr_blkaddr +
xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
#else
return 0;
#endif
}
static inline unsigned
xattrblock_offset(struct erofs_sb_info *sbi, unsigned xattr_id)
{
return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
}
extern const struct xattr_handler erofs_xattr_user_handler;
extern const struct xattr_handler erofs_xattr_trusted_handler;
#ifdef CONFIG_EROFS_FS_SECURITY
extern const struct xattr_handler erofs_xattr_security_handler;
#endif
static inline const struct xattr_handler *erofs_xattr_handler(unsigned index)
{
static const struct xattr_handler *xattr_handler_map[] = {
[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
#ifdef CONFIG_EROFS_FS_POSIX_ACL
[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
&posix_acl_default_xattr_handler,
#endif
[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
#ifdef CONFIG_EROFS_FS_SECURITY
[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
#endif
};
return index && index < ARRAY_SIZE(xattr_handler_map) ?
xattr_handler_map[index] : NULL;
}
#ifdef CONFIG_EROFS_FS_XATTR
extern const struct inode_operations erofs_generic_xattr_iops;
extern const struct inode_operations erofs_dir_xattr_iops;
int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
ssize_t erofs_listxattr(struct dentry *, char *, size_t);
#else
static int __maybe_unused erofs_getxattr(struct inode *inode, int index,
const char *name,
void *buffer, size_t buffer_size)
{
return -ENOTSUPP;
}
static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
char *buffer, size_t buffer_size)
{
return -ENOTSUPP;
}
#endif
#endif