From 1494583de59dfad2e3a6788ce9817e658d32df22 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 22 Mar 2010 20:15:33 -0400 Subject: [PATCH] fix get_active_super()/umount() race This one needs restarts... Signed-off-by: Al Viro --- fs/super.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/fs/super.c b/fs/super.c index 4df8233dfb61..44971d7df1ce 100644 --- a/fs/super.c +++ b/fs/super.c @@ -471,17 +471,17 @@ struct super_block *get_active_super(struct block_device *bdev) if (!bdev) return NULL; +restart: spin_lock(&sb_lock); list_for_each_entry(sb, &super_blocks, s_list) { if (list_empty(&sb->s_instances)) continue; - if (sb->s_bdev != bdev) - continue; - - if (grab_super(sb)) /* drops sb_lock */ - return sb; - - spin_lock(&sb_lock); + if (sb->s_bdev == bdev) { + if (grab_super(sb)) /* drops sb_lock */ + return sb; + else + goto restart; + } } spin_unlock(&sb_lock); return NULL; -- 2.20.1