linux-kernel - [PATCH 03/12] Get rid of pdflush_operation() in emergency sync and remount

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 22 Mar 2009 20:25:55 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	chris.mason@...cle.com, david@...morbit.com, npiggin@...e.de,
	hch@...radead.org, akpm@...ux-foundation.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 03/12] Get rid of pdflush_operation() in emergency sync and remount

Opencode a cheasy approach with kevent. The idea here is that we'll
add some generic delayed work infrastructure, which probably wont be
based on pdflush (or maybe it will, in which case we can just add it
back).

This is in preparation for getting rid of pdflush completely.

Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 fs/super.c |   11 +++++++++--
 fs/sync.c  |   14 +++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/fs/super.c b/fs/super.c
index 6ce5014..dd4acb1 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -674,7 +674,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
 	return 0;
 }
 
-static void do_emergency_remount(unsigned long foo)
+static void do_emergency_remount(struct work_struct *work)
 {
 	struct super_block *sb;
 
@@ -697,12 +697,19 @@ static void do_emergency_remount(unsigned long foo)
 		spin_lock(&sb_lock);
 	}
 	spin_unlock(&sb_lock);
+	kfree(work);
 	printk("Emergency Remount complete\n");
 }
 
 void emergency_remount(void)
 {
-	pdflush_operation(do_emergency_remount, 0);
+	struct work_struct *work;
+
+	work = kmalloc(sizeof(*work), GFP_ATOMIC);
+	if (work) {
+		INIT_WORK(work, do_emergency_remount);
+		schedule_work(work);
+	}
 }
 
 /*
diff --git a/fs/sync.c b/fs/sync.c
index a16d53e..ec95a69 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -42,9 +42,21 @@ SYSCALL_DEFINE0(sync)
 	return 0;
 }
 
+static void do_sync_work(struct work_struct *work)
+{
+	do_sync(0);
+	kfree(work);
+}
+
 void emergency_sync(void)
 {
-	pdflush_operation(do_sync, 0);
+	struct work_struct *work;
+
+	work = kmalloc(sizeof(*work), GFP_ATOMIC);
+	if (work) {
+		INIT_WORK(work, do_sync_work);
+		schedule_work(work);
+	}
 }
 
 /*
-- 
1.6.2.12.g83676

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/