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xfs: flag all buffers as metadata

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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 <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-07-26 15:06:44 +00:00 committed by Alex Elder
parent 1c4f33296e
commit 34951f5cb7
1 changed files with 3 additions and 0 deletions
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fs/xfs/linux-2.6/xfs_buf.c
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@ -1224,6 +1224,9 @@ _xfs_buf_ioapply(
rw = READ; rw = READ;
} }
/* we only use the buffer cache for meta-data */
rw |= REQ_META;
next_chunk: next_chunk:
atomic_inc(&bp->b_io_remaining); atomic_inc(&bp->b_io_remaining);
nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT);