[GFS2] Streamline indirect pointer tree height calculation
This patch improves the calculation of the tree height in order to reduce
the number of operations which are carried out on each call to gfs2_block_map.
In the common case, we now make a single comparison, rather than calculating
the required tree height from scratch each time. Also in the case that the
tree does need some extra height, we start from the current height rather from
zero when we work out what the new height ought to be.
In addition the di_height field is moved into the inode proper and reduced
in size to a u8 since the value must be between 0 and GFS2_MAX_META_HEIGHT (10).
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index d446506..db73868 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -12,7 +12,7 @@
static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
{
- return !ip->i_di.di_height;
+ return !ip->i_height;
}
static inline int gfs2_is_jdata(const struct gfs2_inode *ip)