linux-kernel - [PATCH 10/11] nilfs2: remove not needed freezing calls

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Message-Id: <20171129232356.28296-11-mcgrof@kernel.org>
Date:   Wed, 29 Nov 2017 15:23:55 -0800
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     viro@...iv.linux.org.uk, bart.vanassche@....com,
        ming.lei@...hat.com, tytso@....edu, darrick.wong@...cle.com,
        jikos@...nel.org, rjw@...ysocki.net, pavel@....cz,
        len.brown@...el.com, linux-fsdevel@...r.kernel.org
Cc:     boris.ostrovsky@...cle.com, jgross@...e.com,
        todd.e.brandt@...ux.intel.com, nborisov@...e.com, jack@...e.cz,
        martin.petersen@...cle.com, ONeukum@...e.com,
        oleksandr@...alenko.name, oleg.b.antonyan@...il.com,
        yu.chen.surf@...il.com, dan.j.williams@...el.com,
        linux-pm@...r.kernel.org, linux-block@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH 10/11] nilfs2: remove not needed freezing calls

This removes superflous freezer calls as they are no longer needed
as the VFS now performs filesystem freezing/thaw if the filesystem has
support for it.

The following Coccinelle rule was used as follows:

spatch --sp-file fs-freeze-cleanup.cocci --in-place fs/$FS/

@ has_freeze_fs @
identifier super_ops;
expression freeze_op;
@@

struct super_operations super_ops = {
	.freeze_fs = freeze_op,
};

@ remove_set_freezable depends on has_freeze_fs @
expression time;
statement S, S2, S3;
expression task;
@@

(
-	set_freezable();
|
-	if (try_to_freeze())
-		continue;
|
-	try_to_freeze();
|
-	freezable_schedule();
+	schedule();
|
-	freezable_schedule_timeout(time);
+	schedule_timeout(time);
|
-	if (freezing(task)) { S }
|
-	if (freezing(task)) { S }
-	else
	{ S2 }
|
-	freezing(current)
)

Generated-by: Coccinelle SmPL
Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 fs/nilfs2/segment.c | 48 ++++++++++++++++++++----------------------------
 1 file changed, 20 insertions(+), 28 deletions(-)

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 9f3ffba41533..407e12a60145 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2543,6 +2543,8 @@ static int nilfs_segctor_thread(void *arg)
 	struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
 	struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
 	int timeout = 0;
+	DEFINE_WAIT(wait);
+	int should_sleep = 1;
 
 	sci->sc_timer_task = current;
 
@@ -2574,38 +2576,28 @@ static int nilfs_segctor_thread(void *arg)
 		timeout = 0;
 	}
 
+	prepare_to_wait(&sci->sc_wait_daemon, &wait,
+			TASK_INTERRUPTIBLE);
 
-	if (freezing(current)) {
+	if (sci->sc_seq_request != sci->sc_seq_done)
+		should_sleep = 0;
+	else if (sci->sc_flush_request)
+		should_sleep = 0;
+	else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
+		should_sleep = time_before(jiffies,
+				sci->sc_timer.expires);
+
+	if (should_sleep) {
 		spin_unlock(&sci->sc_state_lock);
-		try_to_freeze();
+		schedule();
 		spin_lock(&sci->sc_state_lock);
-	} else {
-		DEFINE_WAIT(wait);
-		int should_sleep = 1;
-
-		prepare_to_wait(&sci->sc_wait_daemon, &wait,
-				TASK_INTERRUPTIBLE);
-
-		if (sci->sc_seq_request != sci->sc_seq_done)
-			should_sleep = 0;
-		else if (sci->sc_flush_request)
-			should_sleep = 0;
-		else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
-			should_sleep = time_before(jiffies,
-					sci->sc_timer.expires);
-
-		if (should_sleep) {
-			spin_unlock(&sci->sc_state_lock);
-			schedule();
-			spin_lock(&sci->sc_state_lock);
-		}
-		finish_wait(&sci->sc_wait_daemon, &wait);
-		timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
-			   time_after_eq(jiffies, sci->sc_timer.expires));
-
-		if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
-			set_nilfs_discontinued(nilfs);
 	}
+	finish_wait(&sci->sc_wait_daemon, &wait);
+	timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
+		   time_after_eq(jiffies, sci->sc_timer.expires));
+
+	if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
+		set_nilfs_discontinued(nilfs);
 	goto loop;
 
  end_thread:
-- 
2.15.0