On Wed, Jul 10, 2013 at 3:38 PM, Vinson Lee <vlee@xxxxxxxxxxxxxxx> wrote:
> Hi.
>
> Please backport upstream commit
> b911a6bdeef5848c468597d040e3407e0aee04ce to 3.0 and 3.4. This patch
> has already been backported to 3.2, 3.5, and 3.7.
>
> The upstream patch will not build with 3.4 and 3.0 because it needs
> QSTR_INIT. Please use or backport similarly as commit
> 150086ca6bd7493e7753f923a3f55e73701253b3 from linux-3.2.y, which was
> the upstream commit backported by Ben Hutchings.
>
> commit b911a6bdeef5848c468597d040e3407e0aee04ce
> Author: NeilBrown <neilb@xxxxxxx>
> Date: Thu Nov 8 16:09:37 2012 -0800
>
> vfs: d_obtain_alias() needs to use "/" as default name.
>
> 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@xxxxxxx>
> Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
>
> Cheers,
> Vinson
Hi.
Please consider upstream commit
b911a6bdeef5848c468597d040e3407e0aee04ce for the next 3.0 and 3.4
releases.
Cheers,
Vinson
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