[PATCH 13/18] xfs: remove buftarg hash for external devices

[Dave Chinner <david@xxxxxxxxxxxxx>]

From: Dave Chinner <dchinner@xxxxxxxxxx>

For RT and external log devices, we never use hashed buffers on them
now.  Remove the buftarg hash tables that are set up for them.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/xfs/linux-2.6/xfs_buf.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 304515b..1c6206e 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1456,7 +1456,11 @@ xfs_alloc_bufhash(
 {
        unsigned int            i;
 
-       btp->bt_hashshift = external ? 3 : 12;  /* 8 or 4096 buckets */
+       if (external) {
+               btp->bt_hash = NULL;
+               return;
+       }
+       btp->bt_hashshift = 12; /* 4096 buckets */
        btp->bt_hash = kmem_zalloc_large((1 << btp->bt_hashshift) *
                                         sizeof(xfs_bufhash_t));
        for (i = 0; i < (1 << btp->bt_hashshift); i++) {
-- 
1.7.1