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

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Date:   Wed, 29 Nov 2017 15:23:56 -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 11/11] jfs: 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/jfs/jfs_logmgr.c | 11 +++--------
 fs/jfs/jfs_txnmgr.c | 31 +++++++++----------------------
 2 files changed, 12 insertions(+), 30 deletions(-)

diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index 0e5d412c0b01..fa5a95d8fba8 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -2344,14 +2344,9 @@ int jfsIOWait(void *arg)
 			spin_lock_irq(&log_redrive_lock);
 		}
 
-		if (freezing(current)) {
-			spin_unlock_irq(&log_redrive_lock);
-			try_to_freeze();
-		} else {
-			set_current_state(TASK_INTERRUPTIBLE);
-			spin_unlock_irq(&log_redrive_lock);
-			schedule();
-		}
+		set_current_state(TASK_INTERRUPTIBLE);
+		spin_unlock_irq(&log_redrive_lock);
+		schedule();
 	} while (!kthread_should_stop());
 
 	jfs_info("jfsIOWait being killed!");
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 4d973524c887..a313300c4651 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -2747,6 +2747,7 @@ int jfs_lazycommit(void *arg)
 	struct tblock *tblk;
 	unsigned long flags;
 	struct jfs_sb_info *sbi;
+	DECLARE_WAITQUEUE(wq, current);
 
 	do {
 		LAZY_LOCK(flags);
@@ -2793,19 +2794,11 @@ int jfs_lazycommit(void *arg)
 		}
 		/* In case a wakeup came while all threads were active */
 		jfs_commit_thread_waking = 0;
-
-		if (freezing(current)) {
-			LAZY_UNLOCK(flags);
-			try_to_freeze();
-		} else {
-			DECLARE_WAITQUEUE(wq, current);
-
-			add_wait_queue(&jfs_commit_thread_wait, &wq);
-			set_current_state(TASK_INTERRUPTIBLE);
-			LAZY_UNLOCK(flags);
-			schedule();
-			remove_wait_queue(&jfs_commit_thread_wait, &wq);
-		}
+		add_wait_queue(&jfs_commit_thread_wait, &wq);
+		set_current_state(TASK_INTERRUPTIBLE);
+		LAZY_UNLOCK(flags);
+		schedule();
+		remove_wait_queue(&jfs_commit_thread_wait, &wq);
 	} while (!kthread_should_stop());
 
 	if (!list_empty(&TxAnchor.unlock_queue))
@@ -2982,15 +2975,9 @@ int jfs_sync(void *arg)
 		}
 		/* Add anon_list2 back to anon_list */
 		list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
-
-		if (freezing(current)) {
-			TXN_UNLOCK();
-			try_to_freeze();
-		} else {
-			set_current_state(TASK_INTERRUPTIBLE);
-			TXN_UNLOCK();
-			schedule();
-		}
+		set_current_state(TASK_INTERRUPTIBLE);
+		TXN_UNLOCK();
+		schedule();
 	} while (!kthread_should_stop());
 
 	jfs_info("jfs_sync being killed");
-- 
2.15.0