Hi Yan,
This whole series looks great! Sticking it in wip-mds and running it
through the fs qa suite before merging it.
How are you testing these? If you haven't seen it yet, there is an 'mds
thrash exports' option that will make MDSs random migrate subtrees to each
other that is great for shaking out bugs. That and periodic daemon
restarts (one of the first things we need to do on the clustered mds front
is to get daemon restarting integrated into teuthology).
Thanks!
sage
On Tue, 2 Oct 2012, Yan, Zheng wrote:
> From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>
>
> When moving directory between snaprealms, we can avoid creating snaprealm
> if the directory doesn't has its own snaprealm and directory was created
> after both realms' newest snapshot.
>
> Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
> ---
> src/mds/Server.cc | 25 +++++++++++++++++--------
> 1 file changed, 17 insertions(+), 8 deletions(-)
>
> diff --git a/src/mds/Server.cc b/src/mds/Server.cc
> index e16800e..b706b5a 100644
> --- a/src/mds/Server.cc
> +++ b/src/mds/Server.cc
> @@ -4577,7 +4577,8 @@ void Server::_unlink_local(MDRequest *mdr, CDentry *dn, CDentry *straydn)
> mdcache->predirty_journal_parents(mdr, &le->metablob, in, straydn->get_dir(), PREDIRTY_PRIMARY|PREDIRTY_DIR, 1);
>
> // project snaprealm, too
> - in->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm());
> + if (in->snaprealm || follows + 1 > dn->first)
> + in->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm());
>
> le->metablob.add_primary_dentry(straydn, true, in);
> } else {
> @@ -5247,11 +5248,16 @@ void Server::handle_client_rename(MDRequest *mdr)
> }
>
> // moving between snaprealms?
> - if (srcdnl->is_primary() && !srci->snaprealm &&
> - srci->find_snaprealm() != destdn->get_dir()->inode->find_snaprealm()) {
> - dout(10) << " renaming between snaprealms, creating snaprealm for " << *srci << dendl;
> - mds->mdcache->snaprealm_create(mdr, srci);
> - return;
> + if (srcdnl->is_primary() && srci->is_multiversion() && !srci->snaprealm) {
> + SnapRealm *srcrealm = srci->find_snaprealm();
> + SnapRealm *destrealm = destdn->get_dir()->inode->find_snaprealm();
> + if (srcrealm != destrealm &&
> + (srcrealm->get_newest_seq() + 1 > srcdn->first ||
> + destrealm->get_newest_seq() + 1 > srcdn->first)) {
> + dout(10) << " renaming between snaprealms, creating snaprealm for " << *srci << dendl;
> + mds->mdcache->snaprealm_create(mdr, srci);
> + return;
> + }
> }
>
> assert(g_conf->mds_kill_rename_at != 1);
> @@ -5650,6 +5656,7 @@ void Server::_rename_prepare(MDRequest *mdr,
> if (destdn->is_auth())
> mdcache->predirty_journal_parents(mdr, metablob, srci, destdn->get_dir(), flags, 1);
>
> + SnapRealm *src_realm = srci->find_snaprealm();
> SnapRealm *dest_realm = destdn->get_dir()->inode->find_snaprealm();
> snapid_t next_dest_snap = dest_realm->get_newest_seq() + 1;
>
> @@ -5659,7 +5666,8 @@ void Server::_rename_prepare(MDRequest *mdr,
> if (destdnl->is_primary()) {
> if (destdn->is_auth()) {
> // project snaprealm, too
> - oldin->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm());
> + if (oldin->snaprealm || src_realm->get_newest_seq() + 1 > srcdn->first)
> + oldin->project_past_snaprealm_parent(straydn->get_dir()->inode->find_snaprealm());
> straydn->first = MAX(oldin->first, next_dest_snap);
> metablob->add_primary_dentry(straydn, true, oldin);
> }
> @@ -5703,7 +5711,8 @@ void Server::_rename_prepare(MDRequest *mdr,
> }
> } else if (srcdnl->is_primary()) {
> // project snap parent update?
> - if (destdn->is_auth() && srci->snaprealm)
> + if (destdn->is_auth() &&
> + (srci->snaprealm || src_realm->get_newest_seq() + 1 > srcdn->first))
> srci->project_past_snaprealm_parent(dest_realm);
>
> if (destdn->is_auth() && !destdnl->is_null())
> --
> 1.7.11.4
>
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