exportfs: clear DISCONNECTED on all parents sooner
Once we've found any connected parent, we know all our parents are
connected--that's true even if there's a concurrent rename. May as well
clear them all at once and be done with it.
Reviewed-by: Cristoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 87e6dca..c65b748 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -90,6 +90,24 @@
return dentry;
}
+static void clear_disconnected(struct dentry *dentry)
+{
+ dget(dentry);
+ while (dentry->d_flags & DCACHE_DISCONNECTED) {
+ struct dentry *parent = dget_parent(dentry);
+
+ WARN_ON_ONCE(IS_ROOT(dentry));
+
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags &= ~DCACHE_DISCONNECTED;
+ spin_unlock(&dentry->d_lock);
+
+ dput(dentry);
+ dentry = parent;
+ }
+ dput(dentry);
+}
+
/*
* Make sure target_dir is fully connected to the dentry tree.
*
@@ -128,10 +146,9 @@
if (!IS_ROOT(pd)) {
/* must have found a connected parent - great */
- spin_lock(&pd->d_lock);
- pd->d_flags &= ~DCACHE_DISCONNECTED;
- spin_unlock(&pd->d_lock);
- noprogress = 0;
+ clear_disconnected(target_dir);
+ dput(pd);
+ break;
} else {
/*
* We have hit the top of a disconnected path, try to