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| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-05-28 09:48:44 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-03 15:06:46 -0800 |
| commit | f718ea386c2f2a077e29a0f338507cfcd75e55cd (patch) | |
| tree | 1b60c45e40150194a2b69bd5cc275494f22efd5c /fs | |
| parent | 8e0cb6c1f8c403c189b45b969540284862b30f85 (diff) | |
| download | lwn-f718ea386c2f2a077e29a0f338507cfcd75e55cd.tar.gz lwn-f718ea386c2f2a077e29a0f338507cfcd75e55cd.zip | |
lift the "already marked killed" case into shrink_dentry_list()
commit 64fd72e0a44bdd62c5ca277cb24d0d02b2d8e9dc upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dcache.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 65ccdf0e2854..cb40f06ce206 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -453,12 +453,6 @@ 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: @@ -816,6 +810,15 @@ 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. |