Commit 89ad485f authored by Nick Piggin's avatar Nick Piggin

fs: dcache reduce locking in d_alloc

Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
parent 61f3dee4
...@@ -1253,11 +1253,13 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name) ...@@ -1253,11 +1253,13 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
if (parent) { if (parent) {
spin_lock(&parent->d_lock); 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_parent = dget_dlock(parent);
dentry->d_sb = parent->d_sb; dentry->d_sb = parent->d_sb;
list_add(&dentry->d_u.d_child, &parent->d_subdirs); list_add(&dentry->d_u.d_child, &parent->d_subdirs);
spin_unlock(&dentry->d_lock);
spin_unlock(&parent->d_lock); spin_unlock(&parent->d_lock);
} }
......
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