#include "bluesky-private.h"
+#define WRITEBACK_DELAY (5 * 1000000)
+
/* Filesystem caching and cache coherency. */
+static void writeback_complete(gpointer a, gpointer i)
+{
+ BlueSkyInode *inode = (BlueSkyInode *)i;
+
+ g_log("bluesky/flushd", G_LOG_LEVEL_DEBUG,
+ "Writeback for inode %"PRIu64" complete", inode->inum);
+
+ g_mutex_lock(inode->lock);
+
+ inode->change_commit = inode->change_pending;
+ if (inode->change_count == inode->change_commit) {
+ /* If inode is no longer dirty... */
+ inode->change_time = 0;
+ inode->change_pending = 0;
+ }
+
+ g_mutex_unlock(inode->lock);
+}
+
static void flushd_inode(gpointer key, gpointer value, gpointer user_data)
{
BlueSkyFS *fs = (BlueSkyFS *)user_data;
if (inode->change_count == inode->change_commit)
return;
+ if (inode->change_pending) {
+ /* Waiting for an earlier writeback to finish, so don't start a new
+ * writeback yet. */
+ return;
+ }
+
+ uint64_t elapsed = bluesky_get_current_time() - inode->change_time;
+ if (elapsed < WRITEBACK_DELAY) {
+ /* Give a bit more time before starting writeback. */
+ return;
+ }
+
+ inode->change_pending = inode->change_count;
+
g_log("bluesky/flushd", G_LOG_LEVEL_DEBUG,
"Starting flush of inode %"PRIu64, inode->inum);
- if (inode->type == BLUESKY_REGULAR)
- bluesky_file_flush(inode);
- bluesky_inode_flush(fs, inode);
+ /* Create a store barrier. All operations part of the writeback will be
+ * added to this barrier, so when the barrier completes we know that the
+ * writeback is finished. */
+ BlueSkyStoreAsync *barrier = bluesky_store_async_new(fs->store);
+ barrier->op = STORE_OP_BARRIER;
+
+ bluesky_inode_start_sync(inode, barrier);
+
+ bluesky_store_async_add_notifier(barrier, writeback_complete, inode);
+ bluesky_store_async_submit(barrier);
+ bluesky_store_async_unref(barrier);
}
/* Scan through the cache for dirty data and start flushing it to stable