git: hammer2 - Track leaf counts for topological collapse
Matthew Dillon
dillon at crater.dragonflybsd.org
Sat Sep 9 16:08:08 PDT 2017
commit 4e0d25fd335ded4e69323a5355504798a6723399
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Sat Sep 9 15:59:25 2017 -0700
hammer2 - Track leaf counts for topological collapse
* Track leaf counts through indirect blocks. This is a prereq to
being able to efficiently collapse indirect nodes that have become
too empty to be useful.
* Leaf count is capped at 65535. Attempting to decrement the count will
flag the chain to recount (in a later commit).
* Because this count will be used to determine when a collapse is possible,
we do not track leaf counts through inodes. That is, an inode counts as
a leaf.
Summary of changes:
sbin/hammer2/cmd_debug.c | 7 ++++--
sys/vfs/hammer2/hammer2.h | 1 +
sys/vfs/hammer2/hammer2_chain.c | 48 +++++++++++++++++++++++++++++++++++++----
sys/vfs/hammer2/hammer2_disk.h | 14 ++++++++++--
4 files changed, 62 insertions(+), 8 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/4e0d25fd335ded4e69323a5355504798a6723399
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