linux-kernel - [PATCH 03/30] Unionfs: use locking around i_size

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Date:	Fri, 28 Dec 2007 15:42:37 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Erez Zadok <ezk@...sunysb.edu>, Hugh Dickins <hugh@...itas.com>
Subject: [PATCH 03/30] Unionfs: use locking around i_size_write in 32-bit systems

CC: Hugh Dickins <hugh@...itas.com>

Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/super.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 0ff9a9e..ed3eb04 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -69,7 +69,13 @@ static void unionfs_read_inode(struct inode *inode)
  */
 static void unionfs_delete_inode(struct inode *inode)
 {
+#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
+	spin_lock(&inode->i_lock);
+#endif
 	i_size_write(inode, 0);	/* every f/s seems to do that */
+#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
+	spin_unlock(&inode->i_lock);
+#endif
 
 	if (inode->i_data.nrpages)
 		truncate_inode_pages(&inode->i_data, 0);
-- 
1.5.2.2

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