From: Christoph Hellwig Date: Tue, 26 Jul 2011 15:06:44 +0000 (+0000) Subject: xfs: flag all buffers as metadata X-Git-Tag: v3.1-rc1~135^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=34951f5cb72b1e3a89a21581cb21e2d5b6a104a4;p=platform%2Fkernel%2Flinux-stable.git xfs: flag all buffers as metadata Now that REQ_META bios aren't treated specially in the CFQ I/O schedule anymore, we can tag all buffers as metadata to make blktrace traces more meaningful. Note that we use buffers also to zero out partial blocks in the preallocation / hole punching code, and while they operate on data blocks the zeros written certainly aren't data. I think this case is borderline metadata enough to not bother special casing it. Signed-off-by: Christoph Hellwig Signed-off-by: Alex Elder --- diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c index b2b4119..d1fe745 100644 --- a/fs/xfs/linux-2.6/xfs_buf.c +++ b/fs/xfs/linux-2.6/xfs_buf.c @@ -1224,6 +1224,9 @@ _xfs_buf_ioapply( rw = READ; } + /* we only use the buffer cache for meta-data */ + rw |= REQ_META; + next_chunk: atomic_inc(&bp->b_io_remaining); nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT);