From: Jens Axboe <jens.axboe@oracle.com>
Date: Wed, 8 Apr 2009 11:44:08 +0000 (+0200)
Subject: buffer: switch do_emergency_thaw() away from pdflush_operation()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=053c525fcf976810f023d96472f414c0d5e6339b;p=openwrt%2Fstaging%2Fblogic.git

buffer: switch do_emergency_thaw() away from pdflush_operation()

This is (again) a preparatory patch similar to commit
a2a9537ac0b37a5da6fbe7e1e9cb06c524d2a9c4. It open codes a simple
async way of executing do_thaw_all() out of context, so we can get
rid of pdflush.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/fs/buffer.c b/fs/buffer.c
index 13edf7ad3ff1..ff8bb1f2333a 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -547,7 +547,7 @@ repeat:
 	return err;
 }
 
-void do_thaw_all(unsigned long unused)
+void do_thaw_all(struct work_struct *work)
 {
 	struct super_block *sb;
 	char b[BDEVNAME_SIZE];
@@ -567,6 +567,7 @@ restart:
 			goto restart;
 	}
 	spin_unlock(&sb_lock);
+	kfree(work);
 	printk(KERN_WARNING "Emergency Thaw complete\n");
 }
 
@@ -577,7 +578,13 @@ restart:
  */
 void emergency_thaw_all(void)
 {
-	pdflush_operation(do_thaw_all, 0);
+	struct work_struct *work;
+
+	work = kmalloc(sizeof(*work), GFP_ATOMIC);
+	if (work) {
+		INIT_WORK(work, do_thaw_all);
+		schedule_work(work);
+	}
 }
 
 /**