![Gao Xiang](/assets/img/avatar_default.png)
This implements xattr and acl functionalities. Inline and shared xattrs are introduced for flexibility. Specifically, if the same xattr occurs for many times in a large number of inodes or the value of a xattr is so large that it isn't suitable to be inlined, a shared xattr kept in the xattr meta will be used instead. Signed-off-by: Miao Xie <miaoxie@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* linux/drivers/staging/erofs/xattr.h
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*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#ifndef __EROFS_XATTR_H
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#define __EROFS_XATTR_H
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#include "internal.h"
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#include <linux/posix_acl_xattr.h>
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#include <linux/xattr.h>
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/* Attribute not found */
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#define ENOATTR ENODATA
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static inline unsigned inlinexattr_header_size(struct inode *inode)
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{
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return sizeof(struct erofs_xattr_ibody_header)
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+ sizeof(u32) * EROFS_V(inode)->xattr_shared_count;
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}
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static inline erofs_blk_t
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xattrblock_addr(struct erofs_sb_info *sbi, unsigned xattr_id)
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{
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#ifdef CONFIG_EROFS_FS_XATTR
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return sbi->xattr_blkaddr +
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xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
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#else
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return 0;
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#endif
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}
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static inline unsigned
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xattrblock_offset(struct erofs_sb_info *sbi, unsigned xattr_id)
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{
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return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
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}
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extern const struct xattr_handler erofs_xattr_user_handler;
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extern const struct xattr_handler erofs_xattr_trusted_handler;
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#ifdef CONFIG_EROFS_FS_SECURITY
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extern const struct xattr_handler erofs_xattr_security_handler;
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#endif
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static inline const struct xattr_handler *erofs_xattr_handler(unsigned index)
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{
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static const struct xattr_handler *xattr_handler_map[] = {
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[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
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[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
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&posix_acl_default_xattr_handler,
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#endif
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[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
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#ifdef CONFIG_EROFS_FS_SECURITY
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[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
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#endif
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};
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return index && index < ARRAY_SIZE(xattr_handler_map) ?
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xattr_handler_map[index] : NULL;
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}
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#ifdef CONFIG_EROFS_FS_XATTR
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extern const struct inode_operations erofs_generic_xattr_iops;
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extern const struct inode_operations erofs_dir_xattr_iops;
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int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
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ssize_t erofs_listxattr(struct dentry *, char *, size_t);
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#else
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static int __maybe_unused erofs_getxattr(struct inode *inode, int index,
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const char *name,
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void *buffer, size_t buffer_size)
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{
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return -ENOTSUPP;
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}
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static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
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char *buffer, size_t buffer_size)
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{
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return -ENOTSUPP;
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}
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#endif
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#endif
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