mscp_prepare() scans source paths in a thread.

This commit runs mscp_prepare() in a pthread. mscp copy threads
run aysnchronously with mscp_prepare(). So, when mscp_prepare()
has not finished yet (due to too many source files), we can start
to copy files.

include/mscp.h

@@ -155,7 +155,7 @@ int mscp_set_dst_path(struct mscp *m, const char *dst_path);
 /**
  * @brief Prepare for file transfer. This function checks all source
  * files (recursively), resolve paths on the destination side, and
- * calculate file chunks.
+ * calculate file chunks. This function is non-blocking.
  *
  * @param m	mscp instance.
  *
@@ -164,6 +164,17 @@ int mscp_set_dst_path(struct mscp *m, const char *dst_path);
  */
 int mscp_prepare(struct mscp *m);
 
+/**
+ * @brief Join prepare thread invoked by mscp_prepare(). mscp_join()
+ * involves this, so that mscp_prepare_join() should be called when
+ * mscp_prepare() is called by mscp_start() is not.
+ *
+ * @param m	mscp instance.
+ * @return	0 on success, < 0 if an error occured.
+ *		mscp_get_error() can be used to retrieve error message.
+ */
+int mscp_prepare_join(struct mscp *m);
+
 /**
  * @brief Start to copy files. mscp_start() returns immediately. You
  * can get statistics via mscp_get_stats() or messages via pipe set by

src/main.c

@@ -358,7 +358,7 @@ int main(int argc, char **argv)
 	}
 
 	if (dryrun) {
-		ret = 0;
+		ret = mscp_prepare_join(m);
 		goto out;
 	}
 

src/mscp.c

@@ -31,6 +31,8 @@ struct mscp {
 	struct list_head	path_list;
 	struct chunk_pool	cp;
 
+	pthread_t		tid_prepare;	/* tid for prepare thread */
+	int			ret_prepare;	/* return code from prepare thread */
 
 	size_t			total_bytes;	/* total bytes to be transferred */
 	struct mscp_thread	*threads;
@@ -292,9 +294,30 @@ int mscp_set_dst_path(struct mscp *m, const char *dst_path)
 	return 0;
 }
 
-
-int mscp_prepare(struct mscp *m)
+static void mscp_stop_copy_thread(struct mscp *m)
 {
+	int n;
+        for (n = 0; n < m->opts->nr_threads; n++) {
+                if (m->threads[n].tid && !m->threads[n].finished)
+                        pthread_cancel(m->threads[n].tid);
+        }
+}
+
+static void mscp_stop_prepare_thread(struct mscp *m)
+{
+	if (m->tid_prepare)
+		pthread_cancel(m->tid_prepare);
+}
+
+void mscp_stop(struct mscp *m)
+{
+	mscp_stop_prepare_thread(m);
+	mscp_stop_copy_thread(m);
+}
+
+void *mscp_prepare_thread(void *arg)
+{
+	struct mscp *m = arg;
 	sftp_session src_sftp = NULL, dst_sftp = NULL;
 	struct path_resolve_args a;
 	struct list_head tmp;
@@ -302,6 +325,8 @@ int mscp_prepare(struct mscp *m)
 	struct src *s;
 	mstat ss, ds;
 	
+	m->ret_prepare = 0;
+
 	switch (m->direction) {
 	case MSCP_DIRECTION_L2R:
 		src_sftp = NULL;
@@ -313,7 +338,7 @@ int mscp_prepare(struct mscp *m)
 		break;
 	default:
 		mscp_set_error("invalid copy direction: %d", m->direction);
-		return -1;
+		goto err_out;
 	}
 
 	memset(&a, 0, sizeof(a));
@@ -329,11 +354,14 @@ int mscp_prepare(struct mscp *m)
 		mscp_stat_free(ds);
 	}
 
+	mpr_info(m->msg_fd, "start to walk source path(s)\n");
+
 	/* walk a src_path recusively, and resolve path->dst_path for each src */
 	list_for_each_entry(s, &m->src_list, list) {
 		if (mscp_stat(s->path, &ss, src_sftp) < 0) {
 			mscp_set_error("stat: %s", mscp_strerror(src_sftp));
-			return -1;
+			mscp_stat_free(ss);
+			goto err_out;
 		}
 
 		/* fill path_resolve_args */
@@ -350,27 +378,54 @@ int mscp_prepare(struct mscp *m)
 
 		INIT_LIST_HEAD(&tmp);
 		if (walk_src_path(src_sftp, s->path, &tmp, &a) < 0)
-			return -1;
+			goto err_out;
 
 		list_splice_tail(&tmp, m->path_list.prev);
 	}
 
-	chunk_pool_done(&m->cp);
+	chunk_pool_set_filled(&m->cp);
+
+	mpr_info(m->msg_fd, "walk source path(s) done\n");
+
+	m->ret_prepare = 0;
+	return NULL;
+
+err_out:
+	m->ret_prepare = -1;
+	mscp_stop_copy_thread(m);
+	return NULL;
+}
+
+int mscp_prepare(struct mscp *m)
+{
+	int ret = pthread_create(&m->tid_prepare, NULL, mscp_prepare_thread, m);
+	if (ret < 0) {
+		mscp_set_error("pthread_create_error: %d", ret);
+		m->tid_prepare = 0;
+		mscp_stop(m);
+		return -1;
+	}
+
+	/* wait until preparation is end or over nr_threads chunks are
+	 * filled */
+	while (!chunk_pool_is_filled(&m->cp) &&
+	       chunk_pool_size(&m->cp) < m->opts->nr_threads)
+		usleep(100);
 
 	return 0;
 }
 
-void mscp_stop(struct mscp *m)
+int mscp_prepare_join(struct mscp *m)
 {
-	int n;
-        pr("stopping...\n");
-        for (n = 0; n < m->opts->nr_threads; n++) {
-                if (m->threads[n].tid && !m->threads[n].finished)
-                        pthread_cancel(m->threads[n].tid);
-        }
+	if (m->tid_prepare) {
+		pthread_join(m->tid_prepare, NULL);
+		return m->ret_prepare;
+	}
+	return 0;
 }
 
 
+
 static void *mscp_copy_thread(void *arg);
 
 int mscp_start(struct mscp *m)
@@ -394,17 +449,11 @@ int mscp_start(struct mscp *m)
 		else
 			t->cpu = m->cores[n % m->nr_cores];
 
-		if (n == 0) {
-			t->sftp = m->first; /* reuse first sftp session */
-			m->first = NULL;
-		}
-		else {
-			mpr_notice(m->msg_fd, "connecting to %s for a copy thread...\n",
-				   m->remote);
-			t->sftp = ssh_init_sftp_session(m->remote, m->ssh_opts);
-			if (!t->sftp)
-				return -1;
-		}
+		mpr_notice(m->msg_fd, "connecting to %s for a copy thread...\n",
+			   m->remote);
+		t->sftp = ssh_init_sftp_session(m->remote, m->ssh_opts);
+		if (!t->sftp)
+			return -1;
 	}
 
         /* spawn copy threads */
@@ -425,7 +474,10 @@ int mscp_join(struct mscp *m)
 {
 	int n, ret = 0;
 
-        /* waiting for threads join... */
+	/* waiting for prepare thread joins... */
+	ret = mscp_prepare_join(m);
+
+        /* waiting for copy threads join... */
         for (n = 0; n < m->opts->nr_threads; n++) {
                 if (m->threads[n].tid) {
                         pthread_join(m->threads[n].tid, NULL);

src/path.c

@@ -30,46 +30,50 @@ static int get_page_mask(void)
 
 
 /* chunk pool operations */
-#define CHUNK_POOL_STATE_ADDING 0
-#define CHUNK_POOL_STATE_DONE   1
+#define CHUNK_POOL_STATE_FILLING	0
+#define CHUNK_POOL_STATE_FILLED		1
 
 void chunk_pool_init(struct chunk_pool *cp)
 {
 	memset(cp, 0, sizeof(*cp));
 	INIT_LIST_HEAD(&cp->list);
 	lock_init(&cp->lock);
-	cp->state = CHUNK_POOL_STATE_ADDING;
+	cp->state = CHUNK_POOL_STATE_FILLING;
 }
 
 static void chunk_pool_add(struct chunk_pool *cp, struct chunk *c)
 {
 	LOCK_ACQUIRE_THREAD(&cp->lock);
 	list_add_tail(&c->list, &cp->list);
+	cp->count += 1;
 	LOCK_RELEASE_THREAD();
 }
 
-void chunk_pool_done(struct chunk_pool *cp)
+void chunk_pool_set_filled(struct chunk_pool *cp)
 {
-	cp->state = CHUNK_POOL_STATE_DONE;
+	cp->state = CHUNK_POOL_STATE_FILLED;
 }
 
-int chunk_pool_size(struct chunk_pool *cp)
+bool chunk_pool_is_filled(struct chunk_pool *cp)
 {
-	int n;
-	LOCK_ACQUIRE_THREAD(&cp->lock);
-	n = list_count(&cp->list);
-	LOCK_RELEASE_THREAD();
-	return n;
+	return (cp->state == CHUNK_POOL_STATE_FILLED);
 }
 
+size_t chunk_pool_size(struct chunk_pool *cp)
+{
+	return cp->count;
+}
+
+
 struct chunk *chunk_pool_pop(struct chunk_pool *cp)
 {
-	struct list_head *first = cp->list.next;
+	struct list_head *first;
 	struct chunk *c = NULL;
 
 	LOCK_ACQUIRE_THREAD(&cp->lock);
+	first = cp->list.next;
 	if (list_empty(&cp->list)) {
-		if (cp->state == CHUNK_POOL_STATE_ADDING)
+		if (!chunk_pool_is_filled(cp))
 			c = CHUNK_POP_WAIT;
 		else
 			c = NULL; /* no more chunks */
@@ -283,15 +287,19 @@ static int walk_path_recursive(sftp_session sftp, const char *path,
 		return -1;
 	
 	for (e = mscp_readdir(d); !mdirent_is_null(e); e = mscp_readdir(d)) {
-		if (check_path_should_skip(mdirent_name(e)))
+		if (check_path_should_skip(mdirent_name(e))) {
+			mscp_dirent_free(e);
 			continue;
+		}
 		
 		if (strlen(path) + 1 + strlen(mdirent_name(e)) > PATH_MAX) {
 			mscp_set_error("too long path: %s/%s", path, mdirent_name(e));
+			mscp_dirent_free(e);
 			return -1;
 		}
 		snprintf(next_path, sizeof(next_path), "%s/%s", path, mdirent_name(e));
 		ret = walk_path_recursive(sftp, next_path, path_list, a);
+		mscp_dirent_free(e);
 		if (ret < 0)
 			return ret;
 	}
@@ -339,10 +347,13 @@ static int touch_dst_path(struct path *p, sftp_session sftp)
 
 		mstat s;
 		if (mscp_stat(path, &s, sftp) == 0) {
-			if (mstat_is_dir(s))
+			if (mstat_is_dir(s)) {
+				mscp_stat_free(s);
 				goto next; /* directory exists. go deeper */
-			else
+			} else {
+				mscp_stat_free(s);
 				return -1; /* path exists, but not directory. */
+			}
 		}
 
 		if (mscp_stat_check_err_noent(sftp) == 0) {

src/path.h

@@ -39,6 +39,7 @@ struct chunk {
 
 struct chunk_pool {
         struct list_head        list; /* list of struct chunk */
+	size_t			count;
         lock                    lock;
         int                     state;
 };
@@ -54,11 +55,12 @@ void chunk_pool_init(struct chunk_pool *cp);
 struct chunk *chunk_pool_pop(struct chunk_pool *cp);
 #define CHUNK_POP_WAIT ((void *) -1)
 
-/* set adding chunks to this pool has finished */
-void chunk_pool_done(struct chunk_pool *cp);
+/* set and check fillingchunks to this pool has finished */
+void chunk_pool_set_filled(struct chunk_pool *cp);
+bool chunk_pool_is_filled(struct chunk_pool *cp);
 
 /* return number of chunks in the pool */
-int chunk_pool_size(struct chunk_pool *cp);
+size_t chunk_pool_size(struct chunk_pool *cp);
 
 /* free chunks in the chunk_pool */
 void chunk_pool_release(struct chunk_pool *cp);
@@ -168,6 +170,14 @@ static mdirent *mscp_readdir(mdir *d)
         return &e;
 }
 
+static void mscp_dirent_free(mdirent *e)
+{
+	if (e->r) {
+		sftp_attributes_free(e->r);
+		e->r = NULL;
+	}
+}
+
 /* wrap retriving error */
 static const char *mscp_strerror(sftp_session sftp)
 {