Reviewed-by: Greg Farnum <greg@xxxxxxxxxxx>
On Sun, Mar 17, 2013 at 7:51 AM, Yan, Zheng <zheng.z.yan@xxxxxxxxx> wrote:
> From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
>
> open_remote_ino is racy, it's possible someone deletes the inode's
> last linkage while the MDS is discovering the inode.
>
> Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
> ---
> src/mds/MDCache.cc | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
> index 24f1109..d730ff1 100644
> --- a/src/mds/MDCache.cc
> +++ b/src/mds/MDCache.cc
> @@ -9225,8 +9225,15 @@ void MDCache::handle_discover(MDiscover *dis)
> if (dis->get_want_ino()) {
> // lookup by ino
> CInode *in = get_inode(dis->get_want_ino(), snapid);
> - if (in && in->is_auth() && in->get_parent_dn()->get_dir() == curdir)
> + if (in && in->is_auth() && in->get_parent_dn()->get_dir() == curdir) {
> dn = in->get_parent_dn();
> + if (dn->state_test(CDentry::STATE_PURGING)) {
> + // set error flag in reply
> + dout(7) << "dentry " << *dn << " is purging, flagging error ino" << dendl;
> + reply->set_flag_error_ino();
> + break;
> + }
> + }
> } else if (dis->get_want().depth() > 0) {
> // lookup dentry
> dn = curdir->lookup(dis->get_dentry(i), snapid);
> --
> 1.7.11.7
>
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