writeback: remove .nonblocking and .encountered_congestion

Remove two unused struct writeback_control fields:

	.encountered_congestion	(completely unused)
	.nonblocking		(never set, checked/showed in XFS,NFS/btrfs)

The .for_background check in nfs_write_inode() is also removed btw,
as .for_background implies WB_SYNC_NONE.

Reviewed-by: Jan Kara <jack@suse.cz>
Proposed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 4114129f079..b31702ac15b 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -284,7 +284,6 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
                 __field(        long,   pages_skipped           )
                 __field(        loff_t, range_start             )
                 __field(        loff_t, range_end               )
-                __field(        char,   nonblocking             )
                 __field(        char,   for_kupdate             )
                 __field(        char,   for_reclaim             )
                 __field(        char,   range_cyclic            )
@@ -299,7 +298,6 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
                 __entry->pages_skipped  = wbc->pages_skipped;
                 __entry->range_start    = wbc->range_start;
                 __entry->range_end      = wbc->range_end;
-                __entry->nonblocking    = wbc->nonblocking;
                 __entry->for_kupdate    = wbc->for_kupdate;
                 __entry->for_reclaim    = wbc->for_reclaim;
                 __entry->range_cyclic   = wbc->range_cyclic;
@@ -310,13 +308,13 @@ DECLARE_EVENT_CLASS(btrfs__writepage,
 
         TP_printk("root = %llu(%s), ino = %lu, page_index = %lu, "
                   "nr_to_write = %ld, pages_skipped = %ld, range_start = %llu, "
-                  "range_end = %llu, nonblocking = %d, for_kupdate = %d, "
+                  "range_end = %llu, for_kupdate = %d, "
                   "for_reclaim = %d, range_cyclic = %d, writeback_index = %lu",
                   show_root_type(__entry->root_objectid),
                   (unsigned long)__entry->ino, __entry->index,
                   __entry->nr_to_write, __entry->pages_skipped,
                   __entry->range_start, __entry->range_end,
-                  __entry->nonblocking, __entry->for_kupdate,
+                  __entry->for_kupdate,
                   __entry->for_reclaim, __entry->range_cyclic,
                   (unsigned long)__entry->writeback_index)
 );