writeback: Add a 'reason' to wb_writeback_work

[mirror_ubuntu-artful-kernel.git] / include / linux / writeback.h

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index ddb4652cb337ed94ea9ca35cd8448af3f6cf515c..a378c295851f8cf9fe4d804080b30f72cf5101cd 100644 (file)
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -38,6 +38,23 @@ enum writeback_sync_modes {
        WB_SYNC_ALL,    /* Wait on every mapping */
 };
 
+/*
+ * why some writeback work was initiated
+ */
+enum wb_reason {
+       WB_REASON_BACKGROUND,
+       WB_REASON_TRY_TO_FREE_PAGES,
+       WB_REASON_SYNC,
+       WB_REASON_PERIODIC,
+       WB_REASON_LAPTOP_TIMER,
+       WB_REASON_FREE_MORE_MEM,
+       WB_REASON_FS_FREE_SPACE,
+       WB_REASON_FORKER_THREAD,
+
+       WB_REASON_MAX,
+};
+extern const char *wb_reason_name[];
+
 /*
  * A control structure which tells the writeback code what to do.  These are
  * always on the stack, and hence need no locking.  They are always initialised
@@ -69,14 +86,17 @@ struct writeback_control {
  */    
 struct bdi_writeback;
 int inode_wait(void *);
-void writeback_inodes_sb(struct super_block *);
-void writeback_inodes_sb_nr(struct super_block *, unsigned long nr);
-int writeback_inodes_sb_if_idle(struct super_block *);
-int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr);
+void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
+void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
+                                                       enum wb_reason reason);
+int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason);
+int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr,
+                                                       enum wb_reason reason);
 void sync_inodes_sb(struct super_block *);
-long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages);
+long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
+                               enum wb_reason reason);
 long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
-void wakeup_flusher_threads(long nr_pages);
+void wakeup_flusher_threads(long nr_pages, enum wb_reason reason);
 
 /* writeback.h requires fs.h; it, too, is not included from here. */
 static inline void wait_on_inode(struct inode *inode)