writeback: remove writeback_control.more_io

When wbc.more_io was first introduced, it indicates whether there are
at least one superblock whose s_more_io contains more IO work. Now with
the per-bdi writeback, it can be replaced with a simple b_more_io test.

Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Did not change conflicting files.

Conflicts:

	fs/fs-writeback.c
	include/trace/events/writeback.h

1 files changed, 2 insertions, 4 deletions

diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 5ce2b2f5f52..6363193a341 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -380,7 +380,6 @@ TRACE_EVENT(ext4_da_writepages_result,
                 __field(        int,    pages_written           )
                 __field(        long,   pages_skipped           )
                 __field(        int,    sync_mode               )
-                __field(        char,   more_io                 )       
                 __field(       pgoff_t, writeback_index         )
         ),
 
@@ -391,16 +390,15 @@ TRACE_EVENT(ext4_da_writepages_result,
                 __entry->pages_written  = pages_written;
                 __entry->pages_skipped  = wbc->pages_skipped;
                 __entry->sync_mode      = wbc->sync_mode;
-                __entry->more_io        = wbc->more_io;
                 __entry->writeback_index = inode->i_mapping->writeback_index;
         ),
 
         TP_printk("dev %d,%d ino %lu ret %d pages_written %d pages_skipped %ld "
-                  " more_io %d sync_mode %d writeback_index %lu",
+                  "sync_mode %d writeback_index %lu",
                   MAJOR(__entry->dev), MINOR(__entry->dev),
                   (unsigned long) __entry->ino, __entry->ret,
                   __entry->pages_written, __entry->pages_skipped,
-                  __entry->more_io, __entry->sync_mode,
+                  __entry->sync_mode,
                   (unsigned long) __entry->writeback_index)
 );