1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2011 Lennart Poettering
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.
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.
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/>.
32 #include "sparse-endian.h"
33 #include "journal-def.h"
35 #include "mmap-cache.h"
38 typedef struct JournalMetrics {
46 typedef enum direction {
51 typedef enum LocationType {
52 /* The first and last entries, resp. */
56 /* We already read the entry we currently point to, and the
57 * next one to read should probably not be this one again. */
60 /* We should seek to the precise location specified, and
61 * return it, as we haven't read it yet. */
65 typedef struct JournalFile {
76 bool defrag_on_close:1;
78 bool tail_entry_monotonic_valid:1;
80 direction_t last_direction;
81 LocationType location_type;
82 uint64_t last_n_entries;
85 struct stat last_stat;
86 usec_t last_stat_usec;
89 HashItem *data_hash_table;
90 HashItem *field_hash_table;
92 uint64_t current_offset;
93 uint64_t current_seqnum;
94 uint64_t current_realtime;
95 uint64_t current_monotonic;
96 sd_id128_t current_boot_id;
97 uint64_t current_xor_hash;
99 JournalMetrics metrics;
102 OrderedHashmap *chain_cache;
104 #if defined(HAVE_XZ) || defined(HAVE_LZ4)
105 void *compress_buffer;
106 size_t compress_buffer_size;
114 size_t fss_file_size;
116 uint64_t fss_start_usec;
117 uint64_t fss_interval_usec;
120 size_t fsprg_state_size;
123 size_t fsprg_seed_size;
127 int journal_file_open(
133 JournalMetrics *metrics,
134 MMapCache *mmap_cache,
135 JournalFile *template,
138 int journal_file_set_offline(JournalFile *f);
139 void journal_file_close(JournalFile *j);
141 int journal_file_open_reliably(
147 JournalMetrics *metrics,
148 MMapCache *mmap_cache,
149 JournalFile *template,
152 #define ALIGN64(x) (((x) + 7ULL) & ~7ULL)
153 #define VALID64(x) (((x) & 7ULL) == 0ULL)
155 /* Use six characters to cover the offsets common in smallish journal
156 * files without adding too many zeros. */
157 #define OFSfmt "%06"PRIx64
159 static inline bool VALID_REALTIME(uint64_t u) {
160 /* This considers timestamps until the year 3112 valid. That should be plenty room... */
161 return u > 0 && u < (1ULL << 55);
164 static inline bool VALID_MONOTONIC(uint64_t u) {
165 /* This considers timestamps until 1142 years of runtime valid. */
166 return u < (1ULL << 55);
169 static inline bool VALID_EPOCH(uint64_t u) {
170 /* This allows changing the key for 1142 years, every usec. */
171 return u < (1ULL << 55);
174 #define JOURNAL_HEADER_CONTAINS(h, field) \
175 (le64toh((h)->header_size) >= offsetof(Header, field) + sizeof((h)->field))
177 #define JOURNAL_HEADER_SEALED(h) \
178 (!!(le32toh((h)->compatible_flags) & HEADER_COMPATIBLE_SEALED))
180 #define JOURNAL_HEADER_COMPRESSED_XZ(h) \
181 (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_XZ))
183 #define JOURNAL_HEADER_COMPRESSED_LZ4(h) \
184 (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_LZ4))
186 int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset, Object **ret);
188 uint64_t journal_file_entry_n_items(Object *o) _pure_;
189 uint64_t journal_file_entry_array_n_items(Object *o) _pure_;
190 uint64_t journal_file_hash_table_n_items(Object *o) _pure_;
192 int journal_file_append_object(JournalFile *f, ObjectType type, uint64_t size, Object **ret, uint64_t *offset);
193 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);
195 int journal_file_find_data_object(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset);
196 int journal_file_find_data_object_with_hash(JournalFile *f, const void *data, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
198 int journal_file_find_field_object(JournalFile *f, const void *field, uint64_t size, Object **ret, uint64_t *offset);
199 int journal_file_find_field_object_with_hash(JournalFile *f, const void *field, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
201 void journal_file_reset_location(JournalFile *f);
202 void journal_file_save_location(JournalFile *f, direction_t direction, Object *o, uint64_t offset);
203 int journal_file_compare_locations(JournalFile *af, JournalFile *bf);
204 int journal_file_next_entry(JournalFile *f, uint64_t p, direction_t direction, Object **ret, uint64_t *offset);
206 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);
208 int journal_file_move_to_entry_by_seqnum(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset);
209 int journal_file_move_to_entry_by_realtime(JournalFile *f, uint64_t realtime, direction_t direction, Object **ret, uint64_t *offset);
210 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);
212 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);
213 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);
214 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);
215 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);
217 int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint64_t p, uint64_t *seqnum, Object **ret, uint64_t *offset);
219 void journal_file_dump(JournalFile *f);
220 void journal_file_print_header(JournalFile *f);
222 int journal_file_rotate(JournalFile **f, bool compress, bool seal);
224 void journal_file_post_change(JournalFile *f);
226 void journal_default_metrics(JournalMetrics *m, int fd);
228 int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to);
229 int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);
231 bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);