From 61cb188d36a23f83cf161d76d3cf4a27ef8321fa Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@inktank.com>
Date: Tue, 27 Aug 2013 14:11:37 -0700
Subject: mon/OSDMonitor: 'osd tier {set,remove}-overlay <pool> [tierpool]'

Also prevent 'osd tier remove ...' if the tierpool is the current overlay.

Signed-off-by: Sage Weil <sage@inktank.com>
---
 qa/workunits/cephtool/test.sh |  8 ++++++
 src/mon/MonCommands.h         |  8 ++++++
 src/mon/OSDMonitor.cc         | 67 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)

diff --git a/qa/workunits/cephtool/test.sh b/qa/workunits/cephtool/test.sh
index 1c43bf82fd1..d92c2709dfd 100755
--- a/qa/workunits/cephtool/test.sh
+++ b/qa/workunits/cephtool/test.sh
@@ -56,9 +56,17 @@ expect_false ceph osd tier add metadata cache
 ceph osd tier cache-mode cache writeback
 ceph osd tier cache-mode cache readonly
 ceph osd tier cache-mode cache none
+ceph osd tier set-overlay data cache
+expect_false ceph osd tier set-overlay data cache2
 expect_false ceph osd tier remove data cache
+ceph osd tier remove-overlay data
+ceph osd tier set-overlay data cache2
+ceph osd tier remove-overlay data
 ceph osd tier remove data cache
 ceph osd tier add metadata cache
+expect_false ceph osd tier set-overlay data cache
+ceph osd tier set-overlay metadata cache
+ceph osd tier remove-overlay metadata
 ceph osd tier remove metadata cache
 ceph osd tier remove data cache2
 ceph osd pool delete cache cache --yes-i-really-really-mean-it
diff --git a/src/mon/MonCommands.h b/src/mon/MonCommands.h
index d740c1341fe..28fa80e00b7 100644
--- a/src/mon/MonCommands.h
+++ b/src/mon/MonCommands.h
@@ -529,6 +529,14 @@ COMMAND("osd tier cache-mode " \
 	"name=pool,type=CephPoolname " \
 	"name=mode,type=CephChoices,strings=none|writeback|invalidate+forward|readonly", \
 	"specify the caching mode for cache tier <pool>", "osd", "rw", "cli,rest")
+COMMAND("osd tier set-overlay " \
+	"name=pool,type=CephPoolname " \
+	"name=overlaypool,type=CephPoolname", \
+	"set the overlay pool for base pool <pool> to be <overlaypool>", "osd", "rw", "cli,rest")
+COMMAND("osd tier remove-overlay " \
+	"name=pool,type=CephPoolname ", \
+	"remove the overlay pool for base pool <pool>", "osd", "rw", "cli,rest")
+
 /*
  * mon/ConfigKeyService.cc
  */
diff --git a/src/mon/OSDMonitor.cc b/src/mon/OSDMonitor.cc
index af9cc1902f3..99e86c65e67 100644
--- a/src/mon/OSDMonitor.cc
+++ b/src/mon/OSDMonitor.cc
@@ -3682,6 +3682,11 @@ done:
       err = -EINVAL;
       goto reply;
     }
+    if (p->overlay == tierpoolstr) {
+      ss << "tier pool '" << tierpoolstr << "' is the overlay for '" << poolstr << "'; please remove-overlay first";
+      err = -EBUSY;
+      goto reply;
+    }
     // go
     ss << "removed tier '" << tierpoolstr << "' from '" << poolstr << "'";
     if (pending_inc.new_pools.count(pool_id) == 0)
@@ -3692,6 +3697,68 @@ done:
     pending_inc.new_pools[tierpool_id].tier_of.clear();
     wait_for_finished_proposal(new Monitor::C_Command(mon, m, 0, ss.str(), get_last_committed()));
     return true;
+  } else if (prefix == "osd tier set-overlay") {
+    string poolstr;
+    cmd_getval(g_ceph_context, cmdmap, "pool", poolstr);
+    int64_t pool_id = osdmap.lookup_pg_pool_name(poolstr);
+    if (pool_id < 0) {
+      ss << "unrecognized pool '" << poolstr << "'";
+      err = -ENOENT;
+      goto reply;
+    }
+    string overlaypoolstr;
+    cmd_getval(g_ceph_context, cmdmap, "overlaypool", overlaypoolstr);
+    int64_t overlaypool_id = osdmap.lookup_pg_pool_name(overlaypoolstr);
+    if (overlaypool_id < 0) {
+      ss << "unrecognized pool '" << overlaypoolstr << "'";
+      err = -ENOENT;
+      goto reply;
+    }
+    const pg_pool_t *p = osdmap.get_pg_pool(pool_id);
+    assert(p);
+    if (p->tiers.count(overlaypoolstr) == 0) {
+      ss << "tier pool '" << overlaypoolstr << "' is not a tier of '" << poolstr << "'";
+      err = -EINVAL;
+      goto reply;
+    }
+    if (p->overlay == overlaypoolstr) {
+      err = 0;
+      goto reply;
+    }
+    if (p->overlay.length()) {
+      ss << "pool '" << poolstr << "' has overlay '" << p->overlay << "'; please remove-overlay first";
+      err = -EINVAL;
+      goto reply;
+    }
+    // go
+    ss << "set overlay for '" << poolstr << "' to '" << overlaypoolstr << "'";
+    if (pending_inc.new_pools.count(pool_id) == 0)
+      pending_inc.new_pools[pool_id] = *p;
+    pending_inc.new_pools[pool_id].overlay = overlaypoolstr;
+    wait_for_finished_proposal(new Monitor::C_Command(mon, m, 0, ss.str(), get_last_committed()));
+    return true;
+  } else if (prefix == "osd tier remove-overlay") {
+    string poolstr;
+    cmd_getval(g_ceph_context, cmdmap, "pool", poolstr);
+    int64_t pool_id = osdmap.lookup_pg_pool_name(poolstr);
+    if (pool_id < 0) {
+      ss << "unrecognized pool '" << poolstr << "'";
+      err = -ENOENT;
+      goto reply;
+    }
+    const pg_pool_t *p = osdmap.get_pg_pool(pool_id);
+    assert(p);
+    if (p->overlay.length() == 0) {
+      err = 0;
+      goto reply;
+    }
+    // go
+    ss << "removed overlay for '" << poolstr << "'";
+    if (pending_inc.new_pools.count(pool_id) == 0)
+      pending_inc.new_pools[pool_id] = *p;
+    pending_inc.new_pools[pool_id].overlay.clear();
+    wait_for_finished_proposal(new Monitor::C_Command(mon, m, 0, ss.str(), get_last_committed()));
+    return true;
   } else if (prefix == "osd tier cache-mode") {
     string poolstr;
     cmd_getval(g_ceph_context, cmdmap, "pool", poolstr);
-- 
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