X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fjournal%2Fjournal-file.h;h=561982fe3960eb56b701e6ae96bf4de96694b906;hp=e2ef03347ce64fcdcc9a1fb98f043633daf180f5;hb=6e693b42dcb0b332364b0414107826826925c49f;hpb=fb9a24b6b1ed5b1f42e6e350ccdb7e11800a83bd diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h index e2ef03347..561982fe3 100644 --- a/src/journal/journal-file.h +++ b/src/journal/journal-file.h @@ -27,46 +27,81 @@ #include #endif -#include +#include "systemd/sd-id128.h" #include "sparse-endian.h" #include "journal-def.h" #include "util.h" #include "mmap-cache.h" +#include "hashmap.h" typedef struct JournalMetrics { uint64_t max_use; + uint64_t use; uint64_t max_size; uint64_t min_size; uint64_t keep_free; } JournalMetrics; +typedef enum direction { + DIRECTION_UP, + DIRECTION_DOWN +} direction_t; + +typedef enum LocationType { + /* The first and last entries, resp. */ + LOCATION_HEAD, + LOCATION_TAIL, + + /* We already read the entry we currently point to, and the + * next one to read should probably not be this one again. */ + LOCATION_DISCRETE, + + /* We should seek to the precise location specified, and + * return it, as we haven't read it yet. */ + LOCATION_SEEK +} LocationType; + typedef struct JournalFile { int fd; - char *path; - struct stat last_stat; + mode_t mode; int flags; int prot; - bool writable; - bool compress; - bool seal; + bool writable:1; + bool compress_xz:1; + bool compress_lz4:1; + bool seal:1; + + bool tail_entry_monotonic_valid:1; - bool tail_entry_monotonic_valid; + direction_t last_direction; + LocationType location_type; + uint64_t last_n_entries; + + char *path; + struct stat last_stat; Header *header; HashItem *data_hash_table; HashItem *field_hash_table; uint64_t current_offset; + uint64_t current_seqnum; + uint64_t current_realtime; + uint64_t current_monotonic; + sd_id128_t current_boot_id; + uint64_t current_xor_hash; JournalMetrics metrics; MMapCache *mmap; -#ifdef HAVE_XZ + OrderedHashmap *chain_cache; + +#if defined(HAVE_XZ) || defined(HAVE_LZ4) void *compress_buffer; - uint64_t compress_buffer_size; + size_t compress_buffer_size; #endif #ifdef HAVE_GCRYPT @@ -87,11 +122,6 @@ typedef struct JournalFile { #endif } JournalFile; -typedef enum direction { - DIRECTION_UP, - DIRECTION_DOWN -} direction_t; - int journal_file_open( const char *fname, int flags, @@ -103,6 +133,7 @@ int journal_file_open( JournalFile *template, JournalFile **ret); +int journal_file_set_offline(JournalFile *f); void journal_file_close(JournalFile *j); int journal_file_open_reliably( @@ -119,27 +150,59 @@ int journal_file_open_reliably( #define ALIGN64(x) (((x) + 7ULL) & ~7ULL) #define VALID64(x) (((x) & 7ULL) == 0ULL) +/* Use six characters to cover the offsets common in smallish journal + * files without adding too many zeros. */ +#define OFSfmt "%06"PRIx64 + +static inline bool VALID_REALTIME(uint64_t u) { + /* This considers timestamps until the year 3112 valid. That should be plenty room... */ + return u > 0 && u < (1ULL << 55); +} + +static inline bool VALID_MONOTONIC(uint64_t u) { + /* This considers timestamps until 1142 years of runtime valid. */ + return u < (1ULL << 55); +} + +static inline bool VALID_EPOCH(uint64_t u) { + /* This allows changing the key for 1142 years, every usec. */ + return u < (1ULL << 55); +} + #define JOURNAL_HEADER_CONTAINS(h, field) \ (le64toh((h)->header_size) >= offsetof(Header, field) + sizeof((h)->field)) -int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Object **ret); +#define JOURNAL_HEADER_SEALED(h) \ + (!!(le32toh((h)->compatible_flags) & HEADER_COMPATIBLE_SEALED)) + +#define JOURNAL_HEADER_COMPRESSED_XZ(h) \ + (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_XZ)) -uint64_t journal_file_entry_n_items(Object *o); -uint64_t journal_file_entry_array_n_items(Object *o); -uint64_t journal_file_hash_table_n_items(Object *o); +#define JOURNAL_HEADER_COMPRESSED_LZ4(h) \ + (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_LZ4)) -int journal_file_append_object(JournalFile *f, int type, uint64_t size, Object **ret, uint64_t *offset); +int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset, Object **ret); + +uint64_t journal_file_entry_n_items(Object *o) _pure_; +uint64_t journal_file_entry_array_n_items(Object *o) _pure_; +uint64_t journal_file_hash_table_n_items(Object *o) _pure_; + +int journal_file_append_object(JournalFile *f, ObjectType type, uint64_t size, Object **ret, uint64_t *offset); 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); int journal_file_find_data_object(JournalFile *f, const void *data, uint64_t size, Object **ret, uint64_t *offset); int journal_file_find_data_object_with_hash(JournalFile *f, const void *data, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset); +int journal_file_find_field_object(JournalFile *f, const void *field, uint64_t size, Object **ret, uint64_t *offset); +int journal_file_find_field_object_with_hash(JournalFile *f, const void *field, uint64_t size, uint64_t hash, Object **ret, uint64_t *offset); + +void journal_file_reset_location(JournalFile *f); +void journal_file_save_location(JournalFile *f, direction_t direction, Object *o, uint64_t offset); +int journal_file_compare_locations(JournalFile *af, JournalFile *bf); int journal_file_next_entry(JournalFile *f, Object *o, uint64_t p, direction_t direction, Object **ret, uint64_t *offset); -int journal_file_skip_entry(JournalFile *f, Object *o, uint64_t p, int64_t skip, Object **ret, uint64_t *offset); 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); -int journal_file_move_to_entry_by_offset(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset); int journal_file_move_to_entry_by_seqnum(JournalFile *f, uint64_t seqnum, direction_t direction, Object **ret, uint64_t *offset); int journal_file_move_to_entry_by_realtime(JournalFile *f, uint64_t realtime, direction_t direction, Object **ret, uint64_t *offset); 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); @@ -163,4 +226,4 @@ void journal_default_metrics(JournalMetrics *m, int fd); int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *to); int journal_file_get_cutoff_monotonic_usec(JournalFile *f, sd_id128_t boot, usec_t *from, usec_t *to); -bool journal_file_rotate_suggested(JournalFile *f); +bool journal_file_rotate_suggested(JournalFile *f, usec_t max_file_usec);