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: http://www.spinics.net/lists/linux-btrfs/msg13621.html CC: "Theodore Ts'o" <tytso@xxxxxxx> Reported-by: Christoph Hellwig <hch@xxxxxxxxxxxxx> 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 74f23c2..00e32d9 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
