vfs: keep list of mounts for each superblock
Keep track of vfsmounts belonging to a superblock. List is protected by vfsmount_lock. Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz> Tested-by: NToshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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