blob: edabb239548ec93f68f33a81ee68da9ba990f78c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2023 Red Hat
*/
#ifndef UDS_INDEX_H
#define UDS_INDEX_H
#include "index-layout.h"
#include "index-session.h"
#include "open-chapter.h"
#include "volume.h"
#include "volume-index.h"
/*
* The index is a high-level structure which represents the totality of the UDS index. It manages
* the queues for incoming requests and dispatches them to the appropriate sub-components like the
* volume or the volume index. It also manages administrative tasks such as saving and loading the
* index.
*
* The index is divided into a number of independent zones and assigns each request to a zone based
* on its name. Most sub-components are similarly divided into zones as well so that requests in
* each zone usually operate without interference or coordination between zones.
*/
typedef void (*index_callback_fn)(struct uds_request *request);
struct index_zone {
struct uds_index *index;
struct open_chapter_zone *open_chapter;
struct open_chapter_zone *writing_chapter;
u64 oldest_virtual_chapter;
u64 newest_virtual_chapter;
unsigned int id;
};
struct uds_index {
bool has_saved_open_chapter;
bool need_to_save;
struct index_load_context *load_context;
struct index_layout *layout;
struct volume_index *volume_index;
struct volume *volume;
unsigned int zone_count;
struct index_zone **zones;
u64 oldest_virtual_chapter;
u64 newest_virtual_chapter;
u64 last_save;
u64 prev_save;
struct chapter_writer *chapter_writer;
index_callback_fn callback;
struct uds_request_queue *triage_queue;
struct uds_request_queue *zone_queues[];
};
enum request_stage {
STAGE_TRIAGE,
STAGE_INDEX,
STAGE_MESSAGE,
};
int __must_check uds_make_index(struct uds_configuration *config,
enum uds_open_index_type open_type,
struct index_load_context *load_context,
index_callback_fn callback, struct uds_index **new_index);
int __must_check uds_save_index(struct uds_index *index);
void uds_free_index(struct uds_index *index);
int __must_check uds_replace_index_storage(struct uds_index *index,
struct block_device *bdev);
void uds_get_index_stats(struct uds_index *index, struct uds_index_stats *counters);
void uds_enqueue_request(struct uds_request *request, enum request_stage stage);
void uds_wait_for_idle_index(struct uds_index *index);
#endif /* UDS_INDEX_H */
|
