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ocfs2: CoW refcount tree improvement.

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During CoW, if the old extent record is refcounted, we allocate
som new clusters and do CoW. Actually we can have some improvement
here. If the old extent has refcount=1, that means now it is only
used by this file. So we don't need to allocate new clusters, just
remove the refcounted flag and it is OK. We also have to remove
it from the refcount tree while not deleting it.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma
2009-08-18 11:30:55 +08:00
committed by Joel Becker
parent 6f70fa5199
commit 6ae23c5555
3 changed files with 81 additions and 28 deletions
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2
fs/ocfs2/alloc.c
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@@ -6974,7 +6974,7 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
ocfs2_blocks_to_clusters(osb->sb,
delete_blk),
clusters_to_del, meta_ac,
&tc->tc_dealloc);
&tc->tc_dealloc, 1);
else
status = ocfs2_truncate_log_append(osb, handle,
delete_blk,