journal: abstract the resetting of JournalFile's location

[elogind.git] / src / journal / journal-file.h

diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index da2ef3b79534b95789143919a9e86657c7f7ac68..3a19827fb75334ab17c5aa419238cfffde1e2d29 100644 (file)
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -48,6 +48,20 @@ typedef enum direction {
         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;
 
@@ -76,9 +90,9 @@ typedef struct JournalFile {
         JournalMetrics metrics;
         MMapCache *mmap;
 
-        Hashmap *chain_cache;
+        OrderedHashmap *chain_cache;
 
-#ifdef HAVE_XZ
+#if defined(HAVE_XZ) || defined(HAVE_LZ4)
         void *compress_buffer;
         size_t compress_buffer_size;
 #endif
@@ -160,13 +174,13 @@ static inline bool VALID_EPOCH(uint64_t u) {
 #define JOURNAL_HEADER_COMPRESSED_LZ4(h) \
         (!!(le32toh((h)->incompatible_flags) & HEADER_INCOMPATIBLE_COMPRESSED_LZ4))
 
-int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Object **ret);
+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, int type, uint64_t size, Object **ret, uint64_t *offset);
+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);
@@ -175,12 +189,11 @@ int journal_file_find_data_object_with_hash(JournalFile *f, const void *data, ui
 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);
 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);
@@ -205,24 +218,3 @@ int journal_file_get_cutoff_realtime_usec(JournalFile *f, usec_t *from, usec_t *
 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, usec_t max_file_usec);
-
-
-static unsigned type_to_context(int type) {
-        /* One context for each type, plus one catch-all for the rest */
-        return type > 0 && type < _OBJECT_TYPE_MAX ? type : 0;
-}
-
-static inline int journal_file_object_keep(JournalFile *f, Object *o, uint64_t offset) {
-        unsigned context = type_to_context(o->object.type);
-        uint64_t s = le64toh(o->object.size);
-
-        return mmap_cache_get(f->mmap, f->fd, f->prot, context, true,
-                              offset, s, &f->last_stat, NULL);
-}
-
-static inline int journal_file_object_release(JournalFile *f, Object *o, uint64_t offset) {
-        unsigned context = type_to_context(o->object.type);
-        uint64_t s = le64toh(o->object.size);
-
-        return mmap_cache_release(f->mmap, f->fd, f->prot, context, offset, s);
-}