Ocfs2: Fix a regression bug from mainline commit(6b933c8e6f1a2f3118082c455eef25f9b1ac...
authorTristan Ye <tristan.ye@oracle.com>
Thu, 19 Aug 2010 07:15:00 +0000 (15:15 +0800)
committerTao Ma <tao.ma@oracle.com>
Wed, 8 Sep 2010 06:25:57 +0000 (14:25 +0800)
commit81c8c82b5a39f9127e8b239e9b406a6c3a41b228
tree960d5e11585afea6bb4e24a87fb73a975e16883c
parent9b4c0ff32ccd87ab52d4c5bd0a0536febce11370
Ocfs2: Fix a regression bug from mainline commit(6b933c8e6f1a2f3118082c455eef25f9b1ac7b45).

The patch is to fix the regression bug brought from commit 6b933c8...( 'ocfs2:
Avoid direct write if we fall back to buffered I/O'):

http://oss.oracle.com/bugzilla/show_bug.cgi?id=1285

The commit 6b933c8e6f1a2f3118082c455eef25f9b1ac7b45 changed __generic_file_aio_write
to generic_file_buffered_write, which didn't call filemap_{write,wait}_range to  flush
the pagecaches when we were falling O_DIRECT writes back to buffered ones. it did hurt
the O_DIRECT semantics somehow in extented odirect writes.

This patch tries to guarantee O_DIRECT writes of 'fall back to buffered' to be correctly
flushed.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
fs/ocfs2/file.c