1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * fs/hmdfs/hmdfs_dentryfile_cloud.h
4 *
5 * Copyright (c) 2023-2023 Huawei Device Co., Ltd.
6 */
7
8#ifndef HMDFS_DENTRYFILE_CLOUD_H
9#define HMDFS_DENTRYFILE_CLOUD_H
10
11#include "inode.h"
12#include "hmdfs_dentryfile.h"
13
14/*
15 * 4096 = version(1) + bitmap(8) + reserved(7)
16 *        + nsl(60 * 60) + filename(60 * 8)
17 */
18#define DENTRY_BITMAP_LENGTH_CLOUD   8
19#define DENTRY_PER_GROUP_CLOUD       60
20#define DENTRY_GROUP_RESERVED_CLOUD 7
21struct hmdfs_dentry_cloud {
22	__le32 hash;
23	__le16 i_mode;
24	__le16 namelen;
25	__le64 i_size;
26	__le64 i_mtime;
27	__u8 record_id[CLOUD_RECORD_ID_LEN];
28	/* reserved bytes for long term extend, total 60 bytes */
29	__u8 reserved[CLOUD_DENTRY_RESERVED_LENGTH];
30} __packed;
31
32/* 4K/68 Bytes = 60 dentries for per dentrygroup */
33struct hmdfs_dentry_group_cloud {
34	__u8 dentry_version;
35	__u8 bitmap[DENTRY_BITMAP_LENGTH_CLOUD];
36	struct hmdfs_dentry_cloud nsl[DENTRY_PER_GROUP_CLOUD];
37	__u8 filename[DENTRY_PER_GROUP_CLOUD][DENTRY_NAME_LEN];
38	__u8 reserved[DENTRY_GROUP_RESERVED_CLOUD];
39} __packed;
40
41struct hmdfs_dcache_lookup_ctx_cloud {
42	struct hmdfs_sb_info *sbi;
43	const struct qstr *name;
44	struct file *filp;
45	__u32 hash;
46
47	/* for case sensitive */
48	unsigned long bidx;
49	struct hmdfs_dentry_group_cloud *page;
50
51	/* for case insensitive */
52	struct hmdfs_dentry_cloud *insense_de;
53	unsigned long insense_bidx;
54	struct hmdfs_dentry_group_cloud *insense_page;
55};
56
57void hmdfs_init_dcache_lookup_ctx_cloud(
58	struct hmdfs_dcache_lookup_ctx_cloud *ctx, struct hmdfs_sb_info *sbi,
59	const struct qstr *qstr, struct file *filp);
60struct hmdfs_dentry_cloud *
61hmdfs_find_dentry_cloud(struct dentry *child_dentry,
62			struct hmdfs_dcache_lookup_ctx_cloud *ctx);
63#endif
64