linux-kernel - block: Add block_flush

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <1234435137.15433.13.camel@sebastian.kern.oss.ntt.co.jp>
Date:	Thu, 12 Feb 2009 19:38:57 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jan Kara <jack@...e.cz>
Cc:	Theodore Tso <tytso@....EDU>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>, sandeen@...hat.com,
	fernando@....ac.jp
Subject: block: Add block_flush_device()

This patch adds a helper function that should be used by filesystems that need
to flush the underlying block device on fsync()/fdatasync().

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urNp linux-2.6.29-rc3-orig/fs/buffer.c linux-2.6.29-rc3/fs/buffer.c
--- linux-2.6.29-rc3-orig/fs/buffer.c	2009-01-29 09:47:51.000000000 +0900
+++ linux-2.6.29-rc3/fs/buffer.c	2009-01-29 20:11:29.000000000 +0900
@@ -165,6 +165,24 @@ void end_buffer_write_sync(struct buffer
 	put_bh(bh);
 }
 
+/* Issue flush of write caches on the block device */
+int block_flush_device(struct super_block *sb)
+{
+	int ret = 0;
+
+	if (!(sb->s_flags & MS_FLUSHONFSYNC))
+		return ret;
+
+	ret = blkdev_issue_flush(sb->s_bdev, NULL);
+
+	if (ret == -EOPNOTSUPP)
+		return 0;
+
+	return ret;
+}
+EXPORT_SYMBOL(block_flush_device);
+
+
 /*
  * Write out and wait upon all the dirty data associated with a block
  * device via its mapping.  Does not take the superblock lock.
diff -urNp linux-2.6.29-rc3-orig/include/linux/buffer_head.h linux-2.6.29-rc3/include/linux/buffer_head.h
--- linux-2.6.29-rc3-orig/include/linux/buffer_head.h	2009-01-29 09:47:51.000000000 +0900
+++ linux-2.6.29-rc3/include/linux/buffer_head.h	2009-01-29 19:26:33.000000000 +0900
@@ -238,6 +238,7 @@ int nobh_write_end(struct file *, struct
 int nobh_truncate_page(struct address_space *, loff_t, get_block_t *);
 int nobh_writepage(struct page *page, get_block_t *get_block,
                         struct writeback_control *wbc);
+int block_flush_device(struct super_block *sb);
 
 void buffer_init(void);
 


--
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/