| From | Nick Piggin <> | Date | Sat, 27 Nov 2010 20:44:52 +1100 | Subject | [PATCH 22/46] fs: dcache reduce locking in d_alloc |
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Signed-off-by: Nick Piggin <npiggin@kernel.dk> --- fs/dcache.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c index a117139..3e4f7c1 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1220,11 +1220,13 @@ 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); } -- 1.7.1
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