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authorAl Viro <viro@zeniv.linux.org.uk>2015-05-08 11:43:53 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-05-11 08:13:14 -0400
commit294d71ff2f020aa2ef7057a7bd10cf2ec71b5ee3 (patch)
treeb5fe63b7b42ea32ba0d05eca331548e623f66a97 /fs/namespace.c
parent31956502dd2c9432523d01373a9dc0e5931cfa1c (diff)
downloadlinux-294d71ff2f020aa2ef7057a7bd10cf2ec71b5ee3.tar.bz2
new helper: __legitimize_mnt()
same as legitimize_mnt(), except that it does *not* drop and regain rcu_read_lock; return values are 0 => grabbed a reference, we are fine 1 => failed, just go away -1 => failed, go away and mntput(bastard) when outside of rcu_read_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 1b9e11167bae..9c1c43d0d4f1 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -590,24 +590,35 @@ static void delayed_free_vfsmnt(struct rcu_head *head)
}
/* call under rcu_read_lock */
-bool legitimize_mnt(struct vfsmount *bastard, unsigned seq)
+int __legitimize_mnt(struct vfsmount *bastard, unsigned seq)
{
struct mount *mnt;
if (read_seqretry(&mount_lock, seq))
- return false;
+ return 1;
if (bastard == NULL)
- return true;
+ return 0;
mnt = real_mount(bastard);
mnt_add_count(mnt, 1);
if (likely(!read_seqretry(&mount_lock, seq)))
- return true;
+ return 0;
if (bastard->mnt_flags & MNT_SYNC_UMOUNT) {
mnt_add_count(mnt, -1);
- return false;
+ return 1;
+ }
+ return -1;
+}
+
+/* call under rcu_read_lock */
+bool legitimize_mnt(struct vfsmount *bastard, unsigned seq)
+{
+ int res = __legitimize_mnt(bastard, seq);
+ if (likely(!res))
+ return true;
+ if (unlikely(res < 0)) {
+ rcu_read_unlock();
+ mntput(bastard);
+ rcu_read_lock();
}
- rcu_read_unlock();
- mntput(bastard);
- rcu_read_lock();
return false;
}