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Date:	Mon, 16 Jan 2012 16:47:43 +0800
From:	Zheng Liu <>
Cc:	Zheng Liu <>, "Theodore Ts'o" <>
Subject: [PATCH RESEND] ext4: make sure O_(D)SYNC semantic in ext4_fallocate()

Ext4 must make sure the transaction to be commited to the disk when user opens
a file with O_(D)SYNC flag and do a fallocate(2) call.

This problem had been reported by Christoph Hellwig in this thread:

CC: "Theodore Ts'o" <>
Reported-by: Christoph Hellwig <>
Signed-off-by: Zheng Liu <>
 fs/ext4/extents.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 74f23c2..00e32d9 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4356,6 +4356,8 @@ retry:
 			ret = PTR_ERR(handle);
+		if (file->f_flags & O_SYNC)
+			ext4_handle_sync(handle);
 		ret = ext4_map_blocks(handle, inode, &map, flags);
 		if (ret <= 0) {
 #ifdef EXT4FS_DEBUG

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