From 64fd72e0a44bdd62c5ca277cb24d0d02b2d8e9dc Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 28 May 2014 09:48:44 -0400 Subject: [PATCH] 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 --- fs/dcache.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/fs/dcache.c b/fs/dcache.c index 42ae01eefc07..6888dde4d568 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -455,12 +455,6 @@ dentry_kill(struct dentry *dentry, int unlock_on_failure) 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 @@ static void shrink_dentry_list(struct list_head *list) 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. -- 2.20.1