#include <linux/flex_proportions.h>
#include <linux/backing-dev-defs.h>
#include <linux/blk_types.h>
+#include <linux/blk-cgroup.h>
struct bio;
unsigned for_reclaim:1; /* Invoked from the page allocator */
unsigned range_cyclic:1; /* range_start is cyclic */
unsigned for_sync:1; /* sync(2) WB_SYNC_ALL writeback */
+
+ /*
+ * When writeback IOs are bounced through async layers, only the
+ * initial synchronous phase should be accounted towards inode
+ * cgroup ownership arbitration to avoid confusion. Later stages
+ * can set the following flag to disable the accounting.
+ */
+ unsigned no_cgroup_owner:1;
+
+ unsigned punt_to_cgroup:1; /* cgrp punting, see __REQ_CGROUP_PUNT */
+
#ifdef CONFIG_CGROUP_WRITEBACK
struct bdi_writeback *wb; /* wb this writeback is issued under */
struct inode *inode; /* inode being written out */
static inline int wbc_to_write_flags(struct writeback_control *wbc)
{
+ int flags = 0;
+
+ if (wbc->punt_to_cgroup)
+ flags = REQ_CGROUP_PUNT;
+
if (wbc->sync_mode == WB_SYNC_ALL)
- return REQ_SYNC;
+ flags |= REQ_SYNC;
else if (wbc->for_kupdate || wbc->for_background)
- return REQ_BACKGROUND;
+ flags |= REQ_BACKGROUND;
- return 0;
+ return flags;
+}
+
+static inline struct cgroup_subsys_state *
+wbc_blkcg_css(struct writeback_control *wbc)
+{
+#ifdef CONFIG_CGROUP_WRITEBACK
+ if (wbc->wb)
+ return wbc->wb->blkcg_css;
+#endif
+ return blkcg_root_css;
}
/*