lift the "already marked killed" case into shrink_dentry_list()
It can happen only when dentry_kill() is called with unlock_on_failure
equal to 0 - other callers had dentry pinned until the moment they've
got ->d_lock and DCACHE_DENTRY_KILLED is set only after lockref_mark_dead().
IOW, only one of three call sites of dentry_kill() might end up reaching
that code. Just move it there.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index 42ae01e..6888dde 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -455,12 +455,6 @@
struct dentry *parent = NULL;
bool can_free = true;
- if (unlikely(dentry->d_flags & DCACHE_DENTRY_KILLED)) {
- can_free = dentry->d_flags & DCACHE_MAY_FREE;
- spin_unlock(&dentry->d_lock);
- goto out;
- }
-
inode = dentry->d_inode;
if (inode && !spin_trylock(&inode->i_lock)) {
relock:
@@ -815,6 +809,15 @@
continue;
}
+
+ if (unlikely(dentry->d_flags & DCACHE_DENTRY_KILLED)) {
+ bool can_free = dentry->d_flags & DCACHE_MAY_FREE;
+ spin_unlock(&dentry->d_lock);
+ if (can_free)
+ dentry_free(dentry);
+ continue;
+ }
+
parent = dentry_kill(dentry, 0);
/*
* If dentry_kill returns NULL, we have nothing more to do.