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authorDave Chinner <dchinner@redhat.com>2010-09-24 21:58:31 +1000
committerAlex Elder <aelder@sgi.com>2010-10-18 15:07:47 -0500
commit5adc94c247c3779782c7b0b8b5e28cf50596eb37 (patch)
tree95c2fac56cf6b9559b70aeaa43dae5a18b3c3fec /fs/xfs/linux-2.6/xfs_buf.h
parent686865f76e35b28ba7aa6afa19209426f0da6201 (diff)
downloadop-kernel-dev-5adc94c247c3779782c7b0b8b5e28cf50596eb37.zip
op-kernel-dev-5adc94c247c3779782c7b0b8b5e28cf50596eb37.tar.gz
xfs: introduced uncached buffer read primitve
To avoid the need to use cached buffers for single-shot or buffers cached at the filesystem level, introduce a new buffer read primitive that bypasses the cache an reads directly from disk. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index fb30447..57eedc7 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -218,6 +218,9 @@ extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
extern void xfs_buf_hold(xfs_buf_t *);
extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
xfs_buf_flags_t);
+struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp,
+ struct xfs_buftarg *target,
+ xfs_daddr_t daddr, size_t length, int flags);
/* Releasing Buffers */
extern void xfs_buf_free(xfs_buf_t *);
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