264 lines
9.4 KiB
C
264 lines
9.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <inttypes.h>
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#include <sys/uio.h>
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#if HAVE_GCRYPT
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# include <gcrypt.h>
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#endif
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#include "sd-event.h"
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#include "sd-id128.h"
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#include "hashmap.h"
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#include "journal-def.h"
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#include "mmap-cache.h"
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#include "sparse-endian.h"
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#include "time-util.h"
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typedef struct JournalMetrics {
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/* For all these: -1 means "pick automatically", and 0 means "no limit enforced" */
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uint64_t max_size; /* how large journal files grow at max */
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uint64_t min_size; /* how large journal files grow at least */
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uint64_t max_use; /* how much disk space to use in total at max, keep_free permitting */
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uint64_t min_use; /* how much disk space to use in total at least, even if keep_free says not to */
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uint64_t keep_free; /* how much to keep free on disk */
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uint64_t n_max_files; /* how many files to keep around at max */
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} JournalMetrics;
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typedef enum direction {
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DIRECTION_UP,
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DIRECTION_DOWN
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} direction_t;
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typedef enum LocationType {
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/* The first and last entries, resp. */
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LOCATION_HEAD,
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LOCATION_TAIL,
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/* We already read the entry we currently point to, and the
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* next one to read should probably not be this one again. */
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LOCATION_DISCRETE,
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/* We should seek to the precise location specified, and
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* return it, as we haven't read it yet. */
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LOCATION_SEEK
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} LocationType;
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typedef enum OfflineState {
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OFFLINE_JOINED,
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OFFLINE_SYNCING,
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OFFLINE_OFFLINING,
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OFFLINE_CANCEL,
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OFFLINE_AGAIN_FROM_SYNCING,
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OFFLINE_AGAIN_FROM_OFFLINING,
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OFFLINE_DONE
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} OfflineState;
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typedef struct JournalFile {
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int fd;
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MMapFileDescriptor *cache_fd;
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mode_t mode;
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int flags;
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int prot;
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bool writable:1;
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bool compress_xz:1;
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bool compress_lz4:1;
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bool seal:1;
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bool defrag_on_close:1;
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bool close_fd:1;
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bool archive:1;
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direction_t last_direction;
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LocationType location_type;
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uint64_t last_n_entries;
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char *path;
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struct stat last_stat;
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usec_t last_stat_usec;
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Header *header;
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HashItem *data_hash_table;
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HashItem *field_hash_table;
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uint64_t current_offset;
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uint64_t current_seqnum;
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uint64_t current_realtime;
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uint64_t current_monotonic;
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sd_id128_t current_boot_id;
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uint64_t current_xor_hash;
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JournalMetrics metrics;
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MMapCache *mmap;
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sd_event_source *post_change_timer;
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usec_t post_change_timer_period;
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OrderedHashmap *chain_cache;
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pthread_t offline_thread;
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volatile OfflineState offline_state;
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unsigned last_seen_generation;
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uint64_t compress_threshold_bytes;
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#if HAVE_XZ || HAVE_LZ4
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void *compress_buffer;
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size_t compress_buffer_size;
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#endif
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#if HAVE_GCRYPT
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gcry_md_hd_t hmac;
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bool hmac_running;
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FSSHeader *fss_file;
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size_t fss_file_size;
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uint64_t fss_start_usec;
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uint64_t fss_interval_usec;
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void *fsprg_state;
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size_t fsprg_state_size;
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void *fsprg_seed;
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size_t fsprg_seed_size;
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#endif
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} JournalFile;
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int journal_file_open(
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int fd,
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const char *fname,
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int flags,
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mode_t mode,
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bool compress,
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uint64_t compress_threshold_bytes,
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bool seal,
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JournalMetrics *metrics,
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MMapCache *mmap_cache,
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Set *deferred_closes,
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JournalFile *template,
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JournalFile **ret);
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int journal_file_set_offline(JournalFile *f, bool wait);
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bool journal_file_is_offlining(JournalFile *f);
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JournalFile* journal_file_close(JournalFile *j);
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DEFINE_TRIVIAL_CLEANUP_FUNC(JournalFile*, journal_file_close);
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int journal_file_open_reliably(
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const char *fname,
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int flags,
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mode_t mode,
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bool compress,
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uint64_t compress_threshold_bytes,
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bool seal,
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JournalMetrics *metrics,
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MMapCache *mmap_cache,
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Set *deferred_closes,
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JournalFile *template,
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JournalFile **ret);
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#define ALIGN64(x) (((x) + 7ULL) & ~7ULL)
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#define VALID64(x) (((x) & 7ULL) == 0ULL)
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/* Use six characters to cover the offsets common in smallish journal
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* files without adding too many zeros. */
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#define OFSfmt "%06"PRIx64
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static inline bool VALID_REALTIME(uint64_t u) {
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/* This considers timestamps until the year 3112 valid. That should be plenty room... */
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return u > 0 && u < (1ULL << 55);
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}
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static inline bool VALID_MONOTONIC(uint64_t u) {
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/* This considers timestamps until 1142 years of runtime valid. */
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return u < (1ULL << 55);
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}
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static inline bool VALID_EPOCH(uint64_t u) {
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/* This allows changing the key for 1142 years, every usec. */
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return u < (1ULL << 55);
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}
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#define JOURNAL_HEADER_CONTAINS(h, field) \
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(le64toh((h)->header_size) >= offsetof(Header, field) + sizeof((h)->field))
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#define JOURNAL_HEADER_SEALED(h) \
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(!!(le32toh((h)->compatible_flags) & HEADER_COMPATIBLE_SEALED))
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#define JOURNAL_HEADER_COMPRESSED_XZ(h) \
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(!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_XZ))
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#define JOURNAL_HEADER_COMPRESSED_LZ4(h) \
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(!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_LZ4))
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int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset, Object **ret);
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uint64_t journal_file_entry_n_items(Object *o) _pure_;
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uint64_t journal_file_entry_array_n_items(Object *o) _pure_;
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uint64_t journal_file_hash_table_n_items(Object *o) _pure_;
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int journal_file_append_object(JournalFile *f, ObjectType type, uint64_t size, Object **ret, uint64_t *offset);
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int journal_file_append_entry(
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JournalFile *f,
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const dual_timestamp *ts,
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const sd_id128_t *boot_id,
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const struct iovec iovec[], unsigned n_iovec,
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uint64_t *seqno,
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Object **ret,
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uint64_t *offset);
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int journal_file_find_data_object(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset);
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int journal_file_find_data_object_with_hash(JournalFile *f, const void *data, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
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int journal_file_find_field_object(JournalFile *f, const void *field, uint64_t size, Object **ret, uint64_t *offset);
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int journal_file_find_field_object_with_hash(JournalFile *f, const void *field, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset);
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void journal_file_reset_location(JournalFile *f);
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void journal_file_save_location(JournalFile *f, Object *o, uint64_t offset);
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int journal_file_compare_locations(JournalFile *af, JournalFile *bf);
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int journal_file_next_entry(JournalFile *f, uint64_t p, direction_t direction, Object **ret, uint64_t *offset);
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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);
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int journal_file_move_to_entry_by_seqnum(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset);
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int journal_file_move_to_entry_by_realtime(JournalFile *f, uint64_t realtime, direction_t direction, Object **ret, uint64_t *offset);
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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);
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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);
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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);
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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);
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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);
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int journal_file_copy_entry(JournalFile *from, JournalFile *to, Object *o, uint64_t p);
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void journal_file_dump(JournalFile *f);
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void journal_file_print_header(JournalFile *f);
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int journal_file_archive(JournalFile *f);
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JournalFile* journal_initiate_close(JournalFile *f, Set *deferred_closes);
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int journal_file_rotate(JournalFile **f, bool compress, uint64_t compress_threshold_bytes, bool seal, Set *deferred_closes);
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int journal_file_dispose(int dir_fd, const char *fname);
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void journal_file_post_change(JournalFile *f);
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int journal_file_enable_post_change_timer(JournalFile *f, sd_event *e, usec_t t);
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void journal_reset_metrics(JournalMetrics *m);
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void journal_default_metrics(JournalMetrics *m, int fd);
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int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to);
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int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to);
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bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);
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int journal_file_map_data_hash_table(JournalFile *f);
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int journal_file_map_field_hash_table(JournalFile *f);
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static inline bool JOURNAL_FILE_COMPRESS(JournalFile *f) {
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assert(f);
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return f->compress_xz || f->compress_lz4;
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}
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