linux-kernel - [PATCH 6/7] xfs: propagate issue-flush error code

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Date:	Mon, 30 Mar 2009 21:33:14 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	chris.mason@...cle.com, david@...morbit.com, tj@...nel.org,
	bzolnier@...il.com
Subject: [PATCH 6/7] xfs: propagate issue-flush error code

blkdev_issue_flush() may fail (i.e. due to media error on FLUSH CACHE
command execution) so its users should check for the return value.

(This issues was first spotted Bartlomiej Zolnierkiewicz)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_buf.c linux-2.6.29/fs/xfs/linux-2.6/xfs_buf.c
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_buf.c	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_buf.c	2009-03-30 14:44:34.000000000 +0900
@@ -1446,6 +1446,7 @@ xfs_free_buftarg(
  {
  	xfs_flush_buftarg(btp, 1);
  	if (mp->m_flags & XFS_MOUNT_BARRIER)
+		/* FIXME: check return value */
  		xfs_blkdev_issue_flush(btp);
  	xfs_free_bufhash(btp);
  	iput(btp->bt_mapping->host);
diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.c linux-2.6.29/fs/xfs/linux-2.6/xfs_super.c
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.c	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_super.c	2009-03-30 15:16:42.000000000 +0900
@@ -721,11 +721,11 @@ xfs_mountfs_check_barriers(xfs_mount_t *
  	}
  }

-void
+int
  xfs_blkdev_issue_flush(
  	xfs_buftarg_t		*buftarg)
  {
-	blkdev_issue_flush(buftarg->bt_bdev, NULL);
+	return block_flush_device(buftarg->bt_bdev);
  }

  STATIC void
diff -urNp linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.h linux-2.6.29/fs/xfs/linux-2.6/xfs_super.h
--- linux-2.6.29-orig/fs/xfs/linux-2.6/xfs_super.h	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/linux-2.6/xfs_super.h	2009-03-30 14:46:31.000000000 +0900
@@ -89,7 +89,7 @@ struct block_device;

  extern __uint64_t xfs_max_file_offset(unsigned int);

-extern void xfs_blkdev_issue_flush(struct xfs_buftarg *);
+extern int xfs_blkdev_issue_flush(struct xfs_buftarg *);

  extern const struct export_operations xfs_export_operations;
  extern struct xattr_handler *xfs_xattr_handlers[];
diff -urNp linux-2.6.29-orig/fs/xfs/xfs_vnodeops.c linux-2.6.29/fs/xfs/xfs_vnodeops.c
--- linux-2.6.29-orig/fs/xfs/xfs_vnodeops.c	2009-03-24 08:12:14.000000000 +0900
+++ linux-2.6.29/fs/xfs/xfs_vnodeops.c	2009-03-30 15:08:21.000000000 +0900
@@ -678,20 +678,20 @@ xfs_fsync(
  		xfs_iunlock(ip, XFS_ILOCK_EXCL);
  	}

-	if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
+	if (!error && (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
  		/*
  		 * If the log write didn't issue an ordered tag we need
  		 * to flush the disk cache for the data device now.
  		 */
  		if (!log_flushed)
-			xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
+			error = xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);

  		/*
  		 * If this inode is on the RT dev we need to flush that
  		 * cache as well.
  		 */
-		if (XFS_IS_REALTIME_INODE(ip))
-			xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
+		if (!error && XFS_IS_REALTIME_INODE(ip))
+			error = xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
  	}

  	return error;
--
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