From b7ab39f631f505edc2bbdb86620d5493f995c9da Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Fri, 7 Jan 2011 17:49:32 +1100 Subject: fs: dcache scale dentry refcount Make d_count non-atomic and protect it with d_lock. This allows us to ensure a 0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when we start protecting many other dentry members with d_lock. Signed-off-by: Nick Piggin --- fs/ceph/dir.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'fs/ceph/dir.c') diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index d902948a90d8..3ecf915a4550 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -150,7 +150,9 @@ more: di = ceph_dentry(dentry); } - atomic_inc(&dentry->d_count); + spin_lock(&dentry->d_lock); + dentry->d_count++; + spin_unlock(&dentry->d_lock); spin_unlock(&dcache_lock); dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, -- cgit v1.2.3