From: J. Bruce Fields Date: Mon, 9 Sep 2013 20:15:13 +0000 (-0400) Subject: exportfs: clear DISCONNECTED on all parents sooner X-Git-Tag: upstream/snapshot3+hdmi~3996^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0dbc018a490ed482a1236aad77ac12e20742b322;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Signed-off-by: J. Bruce Fields Signed-off-by: Al Viro --- 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 @@ find_disconnected_root(struct dentry *dentry) 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 @@ reconnect_path(struct vfsmount *mnt, struct dentry *target_dir, char *nbuf) 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