linux-kernel - [PATCH 08/11] ext4: remove not needed freezing calls

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Date:   Wed, 29 Nov 2017 15:23:53 -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 08/11] ext4: 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/ext4/super.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 57a8fa451d3e..8a510b1c2d92 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2980,8 +2980,6 @@ static int ext4_lazyinit_thread(void *arg)
 		}
 		mutex_unlock(&eli->li_list_mtx);
 
-		try_to_freeze();
-
 		cur = jiffies;
 		if ((time_after_eq(cur, next_wakeup)) ||
 		    (MAX_JIFFY_OFFSET == next_wakeup)) {
-- 
2.15.0