On Wed, Nov 16, 2011 at 03:42:56AM -0500, Christoph Hellwig wrote:
> It seems all filesystems but XFS ignore O_SYNC for fallocate, and never
> make sure the size update transaction made it to disk.
>
> Given that a fallocate without FALLOC_FL_KEEP_SIZE very much is a data
> operation (it adds new blocks that return zeroes) that seems like a
> fairly nasty surprise for O_SYNC users.
Hi all,
This patch should be fix this problem in ext4.
From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Make sure the transaction to be commited if O_(D)SYNC flag is set in
ext4_fallocate().
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
---
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 61fa9e1..f47e3ad 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4356,6 +4356,8 @@ retry:
ret = PTR_ERR(handle);
break;
}
+ if (file->f_flags & O_SYNC)
+ ext4_handle_sync(handle);
ret = ext4_map_blocks(handle, inode, &map, flags);
if (ret <= 0) {
#ifdef EXT4FS_DEBUG
--
1.7.4.1
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