On Thu, Oct 14, 2021 at 01:17:28PM -0700, Darrick J. Wong wrote:

From: Darrick J. Wong <djwong@kernel.org>

Split out the btree level information into a separate struct and put it
at the end of the cursor structure as a VLA.  Files with huge data forks
(and in the future, the realtime rmap btree) will require the ability to
support many more levels than a per-AG btree cursor, which means that
we're going to create per-btree type cursor caches to conserve memory
for the more common case.

Note that a subsequent patch actually introduces dynamic cursor heights.
This one merely rearranges the structure to prepare for that.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <redacted>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_alloc.c |    6 +-
 fs/xfs/libxfs/xfs_bmap.c  |   10 +--
 fs/xfs/libxfs/xfs_btree.c |  168 +++++++++++++++++++++++----------------------
 fs/xfs/libxfs/xfs_btree.h |   33 +++++++--
 fs/xfs/scrub/bitmap.c     |   22 +++---
 fs/xfs/scrub/bmap.c       |    2 -
 fs/xfs/scrub/btree.c      |   47 +++++++------
 fs/xfs/scrub/trace.c      |    4 +
 fs/xfs/scrub/trace.h      |   10 +--
 fs/xfs/xfs_super.c        |    2 -
 fs/xfs/xfs_trace.h        |    2 -
 11 files changed, 167 insertions(+), 139 deletions(-)

LGTM.

Reviewed-by: Dave Chinner <redacted>
-- 
Dave Chinner
david@fromorbit.com