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authorNeilBrown <neilb@suse.de>2012-11-08 16:09:37 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-14 22:57:08 -0700
commit7a0117d324b902737efa1ce7e26052d475b6649b (patch)
treee89560a2d1fe775f19cceee39111d31739895187 /Makefile
parent4bcdbddd845a9c5bba705e949d9d3f6d9461eb96 (diff)
vfs: d_obtain_alias() needs to use "/" as default name.
commit b911a6bdeef5848c468597d040e3407e0aee04ce upstream. NFS appears to use d_obtain_alias() to create the root dentry rather than d_make_root. This can cause 'prepend_path()' to complain that the root has a weird name if an NFS filesystem is lazily unmounted. e.g. if "/mnt" is an NFS mount then { cd /mnt; umount -l /mnt ; ls -l /proc/self/cwd; } will cause a WARN message like WARNING: at /home/git/linux/fs/dcache.c:2624 prepend_path+0x1d7/0x1e0() ... Root dentry has weird name <> to appear in kernel logs. So change d_obtain_alias() to use "/" rather than "" as the anonymous name. Signed-off-by: NeilBrown <neilb@suse.de> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> [bwh: Backported to 3.2: use named initialisers instead of QSTR_INIT()] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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