[PATCH v2 10/11] vinyl: pass flags to vy_recovery_new

[Vladimir Davydov <vdavydov.dev@gmail.com>]

Currently, this function takes a single boolean argument, but I'm
planning to add another one. Since two bool arguments look rather
confusing, let's turn this arguments into flags.

Needed for #461
---
 src/box/vinyl.c  |  8 +++++---
 src/box/vy_log.c | 19 +++++++++----------
 src/box/vy_log.h | 16 ++++++++++++----
 3 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/src/box/vinyl.c b/src/box/vinyl.c
index d2e3da7e..8cc2ab0e 100644
--- a/src/box/vinyl.c
+++ b/src/box/vinyl.c
@@ -3229,7 +3229,8 @@ vinyl_engine_join(struct engine *engine, const struct vclock *vclock,
 	 * Send all runs stored in it to the replica.
 	 */
 	struct vy_recovery *recovery;
-	recovery = vy_recovery_new(vclock_sum(vclock), true);
+	recovery = vy_recovery_new(vclock_sum(vclock),
+				   VY_RECOVERY_LOAD_CHECKPOINT);
 	if (recovery == NULL) {
 		say_error("failed to recover vylog to join a replica");
 		goto out_join_cord;
@@ -3432,7 +3433,7 @@ vinyl_engine_collect_garbage(struct engine *engine, int64_t lsn)
 
 	/* Cleanup run files. */
 	int64_t signature = checkpoint_last(NULL);
-	struct vy_recovery *recovery = vy_recovery_new(signature, false);
+	struct vy_recovery *recovery = vy_recovery_new(signature, 0);
 	if (recovery == NULL) {
 		say_error("failed to recover vylog for garbage collection");
 		return 0;
@@ -3461,7 +3462,8 @@ vinyl_engine_backup(struct engine *engine, const struct vclock *vclock,
 
 	/* Backup run files. */
 	struct vy_recovery *recovery;
-	recovery = vy_recovery_new(vclock_sum(vclock), true);
+	recovery = vy_recovery_new(vclock_sum(vclock),
+				   VY_RECOVERY_LOAD_CHECKPOINT);
 	if (recovery == NULL) {
 		say_error("failed to recover vylog for backup");
 		return -1;
diff --git a/src/box/vy_log.c b/src/box/vy_log.c
index 8330a26c..e44db5b8 100644
--- a/src/box/vy_log.c
+++ b/src/box/vy_log.c
@@ -176,7 +176,7 @@ struct vy_log {
 static struct vy_log vy_log;
 
 static struct vy_recovery *
-vy_recovery_new_locked(int64_t signature, bool only_checkpoint);
+vy_recovery_new_locked(int64_t signature, int flags);
 
 static int
 vy_recovery_process_record(struct vy_recovery *recovery,
@@ -898,7 +898,7 @@ vy_log_begin_recovery(const struct vclock *vclock)
 	}
 
 	struct vy_recovery *recovery;
-	recovery = vy_recovery_new(vclock_sum(&vy_log.last_checkpoint), false);
+	recovery = vy_recovery_new(vclock_sum(&vy_log.last_checkpoint), 0);
 	if (recovery == NULL)
 		return NULL;
 
@@ -980,7 +980,7 @@ vy_log_rotate(const struct vclock *vclock)
 	latch_lock(&vy_log.latch);
 
 	struct vy_recovery *recovery;
-	recovery = vy_recovery_new_locked(prev_signature, false);
+	recovery = vy_recovery_new_locked(prev_signature, 0);
 	if (recovery == NULL)
 		goto fail;
 
@@ -2007,7 +2007,7 @@ static ssize_t
 vy_recovery_new_f(va_list ap)
 {
 	int64_t signature = va_arg(ap, int64_t);
-	bool only_checkpoint = va_arg(ap, int);
+	int flags = va_arg(ap, int);
 	struct vy_recovery **p_recovery = va_arg(ap, struct vy_recovery **);
 
 	say_verbose("loading vylog %lld", (long long)signature);
@@ -2064,7 +2064,7 @@ vy_recovery_new_f(va_list ap)
 		say_verbose("load vylog record: %s",
 			    vy_log_record_str(&record));
 		if (record.type == VY_LOG_SNAPSHOT) {
-			if (only_checkpoint)
+			if ((flags & VY_RECOVERY_LOAD_CHECKPOINT) != 0)
 				break;
 			continue;
 		}
@@ -2099,7 +2099,7 @@ fail:
  * Must be called with the log latch held.
  */
 static struct vy_recovery *
-vy_recovery_new_locked(int64_t signature, bool only_checkpoint)
+vy_recovery_new_locked(int64_t signature, int flags)
 {
 	int rc;
 	struct vy_recovery *recovery;
@@ -2117,8 +2117,7 @@ vy_recovery_new_locked(int64_t signature, bool only_checkpoint)
 	}
 
 	/* Load the log from coio so as not to stall tx thread. */
-	rc = coio_call(vy_recovery_new_f, signature,
-		       (int)only_checkpoint, &recovery);
+	rc = coio_call(vy_recovery_new_f, signature, flags, &recovery);
 	if (rc != 0) {
 		diag_log();
 		say_error("failed to load `%s'", vy_log_filename(signature));
@@ -2128,12 +2127,12 @@ vy_recovery_new_locked(int64_t signature, bool only_checkpoint)
 }
 
 struct vy_recovery *
-vy_recovery_new(int64_t signature, bool only_checkpoint)
+vy_recovery_new(int64_t signature, int flags)
 {
 	/* Lock out concurrent writers while we are loading the log. */
 	latch_lock(&vy_log.latch);
 	struct vy_recovery *recovery;
-	recovery = vy_recovery_new_locked(signature, only_checkpoint);
+	recovery = vy_recovery_new_locked(signature, flags);
 	latch_unlock(&vy_log.latch);
 	return recovery;
 }
diff --git a/src/box/vy_log.h b/src/box/vy_log.h
index 0a216de8..cdac293e 100644
--- a/src/box/vy_log.h
+++ b/src/box/vy_log.h
@@ -520,18 +520,26 @@ vy_log_begin_recovery(const struct vclock *vclock);
 int
 vy_log_end_recovery(void);
 
+/** Flags passed to vy_recovery_new(). */
+enum vy_recovery_flag {
+	/**
+	 * Do not load records written to the log after checkpoint,
+	 * i.e. get a consistent view of vinyl database at the time
+	 * of the last checkpoint.
+	 */
+	VY_RECOVERY_LOAD_CHECKPOINT	= 1 << 0,
+};
+
 /**
  * Create a recovery context from the metadata log created
  * by checkpoint with the given signature.
  *
- * If @only_checkpoint is set, do not load records appended to
- * the log after checkpoint (i.e. get a consistent view of
- * Vinyl at the time of the checkpoint).
+ * For valid values of @flags, see vy_recovery_flag.
  *
  * Returns NULL on failure.
  */
 struct vy_recovery *
-vy_recovery_new(int64_t signature, bool only_checkpoint);
+vy_recovery_new(int64_t signature, int flags);
 
 /**
  * Free a recovery context created by vy_recovery_new().
-- 
2.11.0