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writeback: remove .nonblocking and .encountered_congestion

PATCH In review Wu Fengguang 2 participants 3 messages May 5, 2011

Subsystems (6)
VFS Btrfs file system NFS client Tracing +2 more subsystems
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Wu Fengguang

author
#0 lore raw

PATCH 1/1 writeback: remove .nonblocking and .encountered_congestion

[allyesconfig compile tested]
[it modifies 3 filesystems all at once, is it OK?]

Remove two unused struct writeback_control fields:

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

Proposed-by Christoph Hellwig <[email protected]>
Signed-off-by Wu Fengguang <[email protected]>
---
 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(-)
fs/xfs/linux-2.6/xfs_aops.c +1 -1
@@ -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 {
include/trace/events/btrfs.h +2 -4
@@ -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)
 );
fs/nfs/write.c +1 -2
@@ -1564,8 +1564,7 @@ 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);
include/linux/writeback.h +0 -2
@@ -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 */
maintainer Reviewed-by on v1 1/1
#1 lore raw
Quoted 10 lines · Wu Fengguang

[allyesconfig compile tested]
[it modifies 3 filesystems all at once, is it OK?]

Remove two unused struct writeback_control fields:

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

Proposed-by Christoph Hellwig <[email protected]>
Signed-off-by Wu Fengguang <[email protected]>

Yep. Makes sense.

Reviewed-by Jan Kara <[email protected]>

BTW: I've noticed you removed ->for_background check from
nfs_write_inode(). That's OK because for_background => WB_SYNC_NONE but I guess you should mention it in the changelog.

Honza

Quoted 75 lines
---
 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(-)
fs/xfs/linux-2.6/xfs_aops.c +1 -1
@@ -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 {
include/trace/events/btrfs.h +2 -4
@@ -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)
 );
fs/nfs/write.c +1 -2
@@ -1564,8 +1564,7 @@ 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);
include/linux/writeback.h +0 -2
@@ -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 */
Signature · 2 lines
Jan Kara <[email protected]>
SUSE Labs, CR
author Reviewed-by Jan Kara
#2 lore raw
Quoted 9 lines · Jan Kara
Quoted 8 lines · Wu Fengguang

[allyesconfig compile tested]
[it modifies 3 filesystems all at once, is it OK?]

Remove two unused struct writeback_control fields:

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

Quoted 7 lines
Quoted 2 lines
Proposed-by Christoph Hellwig <[email protected]>
Signed-off-by Wu Fengguang <[email protected]>

Yep. Makes sense.

Reviewed-by Jan Kara <[email protected]>

BTW: I've noticed you removed ->for_background check from
nfs_write_inode(). That's OK because for_background => WB_SYNC_NONE but I guess you should mention it in the changelog.

Good point!

Thanks,
Fengguang
---
Subject: writeback: remove .nonblocking and .encountered_congestion
Date: Thu May 05 21:10:38 CST 2011

Remove two unused struct writeback_control fields:

.encountered_congestion (completley 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 <[email protected]>
Proposed-by Christoph Hellwig <[email protected]>
Signed-off-by Wu Fengguang <[email protected]>
---
 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(-)
fs/xfs/linux-2.6/xfs_aops.c +1 -1
@@ -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 {
include/trace/events/btrfs.h +2 -4
@@ -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)
 );
fs/nfs/write.c +1 -2
@@ -1564,8 +1564,7 @@ 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);
include/linux/writeback.h +0 -2
@@ -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 */