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authorNick Piggin <npiggin@kernel.dk>2011-01-07 09:49:41 +0300
committerNick Piggin <npiggin@kernel.dk>2011-01-07 09:50:24 +0300
commit89ad485f01fd83c47f17a128db3bd7b89c0f244f (patch)
tree1f9772e3f0dc8ac9392341e677217caf2d9ba36c /fs
parent61f3dee4af09528997a970280da240577bf60721 (diff)
downloadlinux-89ad485f01fd83c47f17a128db3bd7b89c0f244f.tar.xz
fs: dcache reduce locking in d_alloc
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/dcache.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 98a05696593e..ccdc5c2512df 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1253,11 +1253,13 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
if (parent) {
spin_lock(&parent->d_lock);
- spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+ /*
+ * don't need child lock because it is not subject
+ * to concurrency here
+ */
dentry->d_parent = dget_dlock(parent);
dentry->d_sb = parent->d_sb;
list_add(&dentry->d_u.d_child, &parent->d_subdirs);
- spin_unlock(&dentry->d_lock);
spin_unlock(&parent->d_lock);
}