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[PATCH 1/7] block: Add block_flush_device()

From:  Fernando Luis Vázquez Cao <fernando-AT-oss.ntt.co.jp>
To:  Jeff Garzik <jeff-AT-garzik.org>
Subject:  [PATCH 1/7] block: Add block_flush_device()
Date:  Mon, 30 Mar 2009 21:09:43 +0900
Message-ID:  <49D0B687.1030407@oss.ntt.co.jp>
Cc:  Christoph Hellwig <hch-AT-infradead.org>, Linus Torvalds <torvalds-AT-linux-foundation.org>, Theodore Tso <tytso-AT-mit.edu>, Ingo Molnar <mingo-AT-elte.hu>, Alan Cox <alan-AT-lxorguk.ukuu.org.uk>, Arjan van de Ven <arjan-AT-infradead.org>, Andrew Morton <akpm-AT-linux-foundation.org>, Peter Zijlstra <a.p.zijlstra-AT-chello.nl>, Nick Piggin <npiggin-AT-suse.de>, David Rees <drees76-AT-gmail.com>, Jesper Krogh <jesper-AT-krogh.cc>, Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>, chris.mason-AT-oracle.com, david-AT-fromorbit.com, tj-AT-kernel.org
Archive-link:  Article

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@oss.ntt.co.jp>
---

diff -urNp linux-2.6.29-orig/fs/buffer.c linux-2.6.29/fs/buffer.c
--- linux-2.6.29-orig/fs/buffer.c	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/buffer.c	2009-03-30 15:27:04.000000000 +0900
@@ -165,6 +165,17 @@ void end_buffer_write_sync(struct buffer
  	put_bh(bh);
  }

+/* Issue flush of write caches on the block device */
+int block_flush_device(struct block_device *bdev)
+{
+	int ret = 0;
+
+	ret = blkdev_issue_flush(bdev, NULL);
+
+	return (ret == -EOPNOTSUPP) ? 0 : 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-orig/include/linux/buffer_head.h linux-2.6.29/include/linux/buffer_head.h
--- linux-2.6.29-orig/include/linux/buffer_head.h	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/include/linux/buffer_head.h	2009-03-30 15:27:26.000000000 +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 block_device *bdev);

  void buffer_init(void);



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