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Subject[PATCH 15/17] 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>
---
fs/nfs/write.c | 3 +--
fs/xfs/linux-2.6/xfs_aops.c | 2 +-
include/linux/writeback.h | 2 --
include/trace/events/btrfs.h | 6 ++----
4 files changed, 4 insertions(+), 9 deletions(-)
--- linux-next.orig/fs/xfs/linux-2.6/xfs_aops.c 2011-05-06 00:35:11.000000000 +0800
+++ linux-next/fs/xfs/linux-2.6/xfs_aops.c 2011-05-06 00:35:14.000000000 +0800
@@ -970,7 +970,7 @@ xfs_vm_writepage(
offset = page_offset(page);
type = IO_OVERWRITE;

- if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking)
+ if (wbc->sync_mode == WB_SYNC_NONE)
nonblocking = 1;

do {
--- linux-next.orig/include/trace/events/btrfs.h 2011-05-06 00:35:11.000000000 +0800
+++ linux-next/include/trace/events/btrfs.h 2011-05-06 00:35:14.000000000 +0800
@@ -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)
);
--- linux-next.orig/fs/nfs/write.c 2011-05-06 00:35:11.000000000 +0800
+++ linux-next/fs/nfs/write.c 2011-05-06 00:35:14.000000000 +0800
@@ -1562,8 +1562,7 @@ int nfs_write_inode(struct inode *inode,
int status;
bool sync = true;

- if (wbc->sync_mode == WB_SYNC_NONE || wbc->nonblocking ||
- wbc->for_background)
+ if (wbc->sync_mode == WB_SYNC_NONE)
sync = false;

status = pnfs_layoutcommit_inode(inode, sync);
--- linux-next.orig/include/linux/writeback.h 2011-05-06 00:35:14.000000000 +0800
+++ linux-next/include/linux/writeback.h 2011-05-06 00:35:14.000000000 +0800
@@ -36,8 +36,6 @@ struct writeback_control {
loff_t range_start;
loff_t range_end;

- unsigned nonblocking:1; /* Don't get stuck on request queues */
- unsigned encountered_congestion:1; /* An output: a queue is full */
unsigned for_kupdate:1; /* A kupdate writeback */
unsigned for_background:1; /* A background writeback */
unsigned tagged_sync:1; /* do livelock prevention for sync */



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