chiark / gitweb /
enable localization for common *ctl commands
[elogind.git] / src / journal / journal-file.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 #pragma once
4
5 /***
6   This file is part of systemd.
7
8   Copyright 2011 Lennart Poettering
9
10   systemd is free software; you can redistribute it and/or modify it
11   under the terms of the GNU Lesser General Public License as published by
12   the Free Software Foundation; either version 2.1 of the License, or
13   (at your option) any later version.
14
15   systemd is distributed in the hope that it will be useful, but
16   WITHOUT ANY WARRANTY; without even the implied warranty of
17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18   Lesser General Public License for more details.
19
20   You should have received a copy of the GNU Lesser General Public License
21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 ***/
23
24 #include <inttypes.h>
25
26 #ifdef HAVE_GCRYPT
27 #include <gcrypt.h>
28 #endif
29
30 #include <systemd/sd-id128.h>
31
32 #include "sparse-endian.h"
33 #include "journal-def.h"
34 #include "util.h"
35 #include "mmap-cache.h"
36 #include "hashmap.h"
37
38 typedef struct JournalMetrics {
39         uint64_t max_use;
40         uint64_t max_size;
41         uint64_t min_size;
42         uint64_t keep_free;
43 } JournalMetrics;
44
45 typedef struct JournalFile {
46         int fd;
47         char *path;
48         struct stat last_stat;
49         mode_t mode;
50
51         int flags;
52         int prot;
53         bool writable;
54         bool compress;
55         bool seal;
56
57         bool tail_entry_monotonic_valid;
58
59         Header *header;
60         HashItem *data_hash_table;
61         HashItem *field_hash_table;
62
63         uint64_t current_offset;
64
65         JournalMetrics metrics;
66         MMapCache *mmap;
67
68         Hashmap *chain_cache;
69
70 #ifdef HAVE_XZ
71         void *compress_buffer;
72         uint64_t compress_buffer_size;
73 #endif
74
75 #ifdef HAVE_GCRYPT
76         gcry_md_hd_t hmac;
77         bool hmac_running;
78
79         FSSHeader *fss_file;
80         size_t fss_file_size;
81
82         uint64_t fss_start_usec;
83         uint64_t fss_interval_usec;
84
85         void *fsprg_state;
86         size_t fsprg_state_size;
87
88         void *fsprg_seed;
89         size_t fsprg_seed_size;
90 #endif
91 } JournalFile;
92
93 typedef enum direction {
94         DIRECTION_UP,
95         DIRECTION_DOWN
96 } direction_t;
97
98 int journal_file_open(
99                 const char *fname,
100                 int flags,
101                 mode_t mode,
102                 bool compress,
103                 bool seal,
104                 JournalMetrics *metrics,
105                 MMapCache *mmap_cache,
106                 JournalFile *template,
107                 JournalFile **ret);
108
109 void journal_file_close(JournalFile *j);
110
111 int journal_file_open_reliably(
112                 const char *fname,
113                 int flags,
114                 mode_t mode,
115                 bool compress,
116                 bool seal,
117                 JournalMetrics *metrics,
118                 MMapCache *mmap_cache,
119                 JournalFile *template,
120                 JournalFile **ret);
121
122 #define ALIGN64(x) (((x) + 7ULL) & ~7ULL)
123 #define VALID64(x) (((x) & 7ULL) == 0ULL)
124
125 static inline bool VALID_REALTIME(uint64_t u) {
126         /* This considers timestamps until the year 3112 valid. That should be plenty room... */
127         return u > 0 && u < (1ULL << 55);
128 }
129
130 static inline bool VALID_MONOTONIC(uint64_t u) {
131         /* This considers timestamps until 1142 years of runtime valid. */
132         return u < (1ULL << 55);
133 }
134
135 static inline bool VALID_EPOCH(uint64_t u) {
136         /* This allows changing the key for 1142 years, every usec. */
137         return u < (1ULL << 55);
138 }
139
140 #define JOURNAL_HEADER_CONTAINS(h, field) \
141         (le64toh((h)->header_size) >= offsetof(Header, field) + sizeof((h)->field))
142
143 #define JOURNAL_HEADER_SEALED(h) \
144         (!!(le32toh((h)->compatible_flags) & HEADER_COMPATIBLE_SEALED))
145
146 #define JOURNAL_HEADER_COMPRESSED(h) \
147         (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED))
148
149 int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Object **ret);
150
151 uint64_t journal_file_entry_n_items(Object *o);
152 uint64_t journal_file_entry_array_n_items(Object *o);
153 uint64_t journal_file_hash_table_n_items(Object *o);
154
155 int journal_file_append_object(JournalFile *f, int type, uint64_t size, Object **ret, uint64_t *offset);
156 int journal_file_append_entry(JournalFile *f, const dual_timestamp *ts, const struct iovec iovec[], unsigned n_iovec, uint64_t *seqno, Object **ret, uint64_t *offset);
157
158 int journal_file_find_data_object(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset);
159 int journal_file_find_data_object_with_hash(JournalFile *f, const void *data, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
160
161 int journal_file_find_field_object(JournalFile *f, const void *field, uint64_t size, Object **ret, uint64_t *offset);
162 int journal_file_find_field_object_with_hash(JournalFile *f, const void *field, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
163
164 int journal_file_next_entry(JournalFile *f, Object *o, uint64_t p, direction_t direction, Object **ret, uint64_t *offset);
165 int journal_file_skip_entry(JournalFile *f, Object *o, uint64_t p, int64_t skip, Object **ret, uint64_t *offset);
166
167 int journal_file_next_entry_for_data(JournalFile *f, Object *o, uint64_t p, uint64_t data_offset, direction_t direction, Object **ret, uint64_t *offset);
168
169 int journal_file_move_to_entry_by_offset(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset);
170 int journal_file_move_to_entry_by_seqnum(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset);
171 int journal_file_move_to_entry_by_realtime(JournalFile *f, uint64_t realtime, direction_t direction, Object **ret, uint64_t *offset);
172 int journal_file_move_to_entry_by_monotonic(JournalFile *f, sd_id128_t boot_id, uint64_t monotonic, direction_t direction, Object **ret, uint64_t *offset);
173
174 int journal_file_move_to_entry_by_offset_for_data(JournalFile *f, uint64_t data_offset, uint64_t p, direction_t direction, Object **ret, uint64_t *offset);
175 int journal_file_move_to_entry_by_seqnum_for_data(JournalFile *f, uint64_t data_offset, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset);
176 int journal_file_move_to_entry_by_realtime_for_data(JournalFile *f, uint64_t data_offset, uint64_t realtime, direction_t direction, Object **ret, uint64_t *offset);
177 int journal_file_move_to_entry_by_monotonic_for_data(JournalFile *f, uint64_t data_offset, sd_id128_t boot_id, uint64_t monotonic, direction_t direction, Object **ret, uint64_t *offset);
178
179 int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint64_t p, uint64_t *seqnum, Object **ret, uint64_t *offset);
180
181 void journal_file_dump(JournalFile *f);
182 void journal_file_print_header(JournalFile *f);
183
184 int journal_file_rotate(JournalFile **f, bool compress, bool seal);
185
186 void journal_file_post_change(JournalFile *f);
187
188 void journal_default_metrics(JournalMetrics *m, int fd);
189
190 int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to);
191 int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);
192
193 bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);