osd: remove magical tmap -> omap conversion

This is incomplete and unfortunately unusable in its current state:

 - it would only set USES_TMAP for old encoded object_info_t and tmapput,
   but would NOT set it for tmapup
 - a config option turned that off by default.

That means that the mds conversion from tmap -> omap won't be able to use
this because any existing cluster has tmap objects without the USES_TMAP
flag set.  And we don't want to unconditionally try a tmap->omap conversion
on omap operations because there are lots of existing librados users out
there that will be negatively impacted by this.

Instead, the MDS will need to handle this conversion on the client side by
reading either tmap or omap objects and explicitly rewriting the content
with omap (while truncating the tmap data away).

The auto-conversion function was added in v0.44.

Signed-off-by: Sage Weil <sage@inktank.com>

5 files changed, 17 insertions, 123 deletions

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index ef52aca884b..9a751ffdb49 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -35,3 +35,19 @@ v0.70
 v0.71
 ~~~~~
 
+* The MDS now disallows snapshots by default as they are not
+  considered stable.  The command 'ceph mds set allow_snaps' will
+  enable them.
+
+* For clusters that were created before v0.44 (pre-argonaut, Spring
+  2012) and store radosgw data, the auto-upgrade from TMAP to OMAP
+  objects has been disabled.  Before upgrading, make sure that any
+  buckets created on pre-argonaut releases have been modified (e.g.,
+  by PUTing and then DELETEing an object from each bucket).  Any
+  cluster created with argonaut (v0.48) or a later release or not
+  using radosgw never relied on the automatic conversion and is not
+  affected by this change.
+
+* Any direct users of the 'tmap' portion of the librados API should be
+  aware that the automatic tmap -> omap conversion functionality has
+  been removed.
diff --git a/src/common/config_opts.h b/src/common/config_opts.h
index d7505306b6e..fad831f5543 100644
--- a/src/common/config_opts.h
+++ b/src/common/config_opts.h
@@ -362,12 +362,6 @@ OPTION(mds_standby_replay, OPT_BOOL, false)
 // If true, compact leveldb store on mount
 OPTION(osd_compact_leveldb_on_mount, OPT_BOOL, false)
 
-// If true, uses tmap as initial value for omap on old objects
-OPTION(osd_auto_upgrade_tmap, OPT_BOOL, true)
-
-// If true, TMAPPUT sets uses_tmap DEBUGGING ONLY
-OPTION(osd_tmapput_sets_uses_tmap, OPT_BOOL, false)
-
 // Maximum number of backfills to or from a single osd
 OPTION(osd_max_backfills, OPT_U64, 10)
 
diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index 004b5193e4b..fb5e45a1a71 100644
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -3307,11 +3307,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	  }
 	}
 
-	if (cct->_conf->osd_tmapput_sets_uses_tmap) {
-	  assert(cct->_conf->osd_auto_upgrade_tmap);
-	  oi.set_flag(object_info_t::FLAG_USES_TMAP);
-	}
-
 	// write it
 	vector<OSDOp> nops(1);
 	OSDOp& newop = nops[0];
@@ -3357,29 +3352,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	}
 	set<string> out_set;
 
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  dout(20) << "CEPH_OSD_OP_OMAPGETKEYS: "
-		   << " Reading " << oi.soid << " omap from tmap" << dendl;
-	  map<string, bufferlist> vals;
-	  bufferlist header;
-	  int r = _get_tmap(ctx, &vals, &header);
-	  if (r == 0) {
-	    map<string, bufferlist>::iterator iter =
-	      vals.upper_bound(start_after);
-	    for (uint64_t i = 0;
-		 i < max_return && iter != vals.end();
-		 ++i, iter++) {
-	      out_set.insert(iter->first);
-	    }
-	    ::encode(out_set, osd_op.outdata);
-	    ctx->delta_stats.num_rd_kb += SHIFT_ROUND_UP(osd_op.outdata.length(), 10);
-	    ctx->delta_stats.num_rd++;
-	    break;
-	  }
-	  dout(10) << "failed, reading from omap" << dendl;
-	  // No valid tmap, use omap
-	}
-
 	{
 	  ObjectMap::ObjectMapIterator iter = osd->store->get_omap_iterator(
 	    coll, soid
@@ -3415,30 +3387,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	}
 	map<string, bufferlist> out_set;
 
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  dout(20) << "CEPH_OSD_OP_OMAPGETVALS: "
-		   << " Reading " << oi.soid << " omap from tmap" << dendl;
-	  map<string, bufferlist> vals;
-	  bufferlist header;
-	  int r = _get_tmap(ctx, &vals, &header);
-	  if (r == 0) {
-	    map<string, bufferlist>::iterator iter = vals.upper_bound(start_after);
-	    if (filter_prefix > start_after) iter = vals.lower_bound(filter_prefix);
-	    for (uint64_t i = 0;
-		 i < max_return && iter != vals.end() &&
-		   iter->first.substr(0, filter_prefix.size()) == filter_prefix;
-		 ++i, iter++) {
-	      out_set.insert(*iter);
-	    }
-	    ::encode(out_set, osd_op.outdata);
-	    ctx->delta_stats.num_rd_kb += SHIFT_ROUND_UP(osd_op.outdata.length(), 10);
-	    ctx->delta_stats.num_rd++;
-	    break;
-	  }
-	  // No valid tmap, use omap
-	  dout(10) << "failed, reading from omap" << dendl;
-	}
-
 	{
 	  ObjectMap::ObjectMapIterator iter = osd->store->get_omap_iterator(
 	    coll, soid
@@ -3466,19 +3414,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
     case CEPH_OSD_OP_OMAPGETHEADER:
       ++ctx->num_read;
       {
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  dout(20) << "CEPH_OSD_OP_OMAPGETHEADER: "
-		   << " Reading " << oi.soid << " omap from tmap" << dendl;
-	  map<string, bufferlist> vals;
-	  bufferlist header;
-	  int r = _get_tmap(ctx, &vals, &header);
-	  if (r == 0) {
-	    osd_op.outdata.claim(header);
-	    break;
-	  }
-	  // No valid tmap, fall through to omap
-	  dout(10) << "failed, reading from omap" << dendl;
-	}
 	osd->store->omap_get_header(coll, soid, &osd_op.outdata);
 	ctx->delta_stats.num_rd_kb += SHIFT_ROUND_UP(osd_op.outdata.length(), 10);
 	ctx->delta_stats.num_rd++;
@@ -3497,28 +3432,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	  goto fail;
 	}
 	map<string, bufferlist> out;
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  dout(20) << "CEPH_OSD_OP_OMAPGET: "
-		   << " Reading " << oi.soid << " omap from tmap" << dendl;
-	  map<string, bufferlist> vals;
-	  bufferlist header;
-	  int r = _get_tmap(ctx, &vals, &header);
-	  if (r == 0) {
-	    for (set<string>::iterator iter = keys_to_get.begin();
-		 iter != keys_to_get.end();
-		 ++iter) {
-	      if (vals.count(*iter)) {
-		out.insert(*(vals.find(*iter)));
-	      }
-	    }
-	    ::encode(out, osd_op.outdata);
-	    ctx->delta_stats.num_rd_kb += SHIFT_ROUND_UP(osd_op.outdata.length(), 10);
-	    ctx->delta_stats.num_rd++;
-	    break;
-	  }
-	  // No valid tmap, use omap
-	  dout(10) << "failed, reading from omap" << dendl;
-	}
 	osd->store->omap_get_values(coll, soid, keys_to_get, &out);
 	::encode(out, osd_op.outdata);
 	ctx->delta_stats.num_rd_kb += SHIFT_ROUND_UP(osd_op.outdata.length(), 10);
@@ -3596,9 +3509,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
     case CEPH_OSD_OP_OMAPSETVALS:
       ++ctx->num_write;
       {
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  _copy_up_tmap(ctx);
-	}
 	if (!obs.exists) {
 	  ctx->delta_stats.num_objects++;
 	  obs.exists = true;
@@ -3626,9 +3536,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
     case CEPH_OSD_OP_OMAPSETHEADER:
       ++ctx->num_write;
       {
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  _copy_up_tmap(ctx);
-	}
 	if (!obs.exists) {
 	  ctx->delta_stats.num_objects++;
 	  obs.exists = true;
@@ -3646,9 +3553,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	  result = -ENOENT;
 	  break;
 	}
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  _copy_up_tmap(ctx);
-	}
 	t.touch(coll, soid);
 	t.omap_clear(coll, soid);
 	ctx->delta_stats.num_wr++;
@@ -3662,9 +3566,6 @@ int ReplicatedPG::do_osd_ops(OpContext *ctx, vector<OSDOp>& ops)
 	  result = -ENOENT;
 	  break;
 	}
-	if (oi.test_flag(object_info_t::FLAG_USES_TMAP) && cct->_conf->osd_auto_upgrade_tmap) {
-	  _copy_up_tmap(ctx);
-	}
 	t.touch(coll, soid);
 	set<string> to_rm;
 	try {
@@ -3838,22 +3739,6 @@ int ReplicatedPG::_get_tmap(OpContext *ctx,
   return 0;
 }
 
-int ReplicatedPG::_copy_up_tmap(OpContext *ctx)
-{
-  dout(20) << "copying up tmap for " << ctx->new_obs.oi.soid << dendl;
-  ctx->new_obs.oi.clear_flag(object_info_t::FLAG_USES_TMAP);
-  map<string, bufferlist> vals;
-  bufferlist header;
-  int r = _get_tmap(ctx, &vals, &header);
-  if (r < 0)
-    return 0;
-  ctx->op_t.omap_setkeys(coll, ctx->new_obs.oi.soid,
-			 vals);
-  ctx->op_t.omap_setheader(coll, ctx->new_obs.oi.soid,
-			   header);
-  return 0;
-}
-
 inline int ReplicatedPG::_delete_head(OpContext *ctx)
 {
   SnapSet& snapset = ctx->new_snapset;
diff --git a/src/osd/ReplicatedPG.h b/src/osd/ReplicatedPG.h
index 4b91a2135dc..05edcef6adf 100644
--- a/src/osd/ReplicatedPG.h
+++ b/src/osd/ReplicatedPG.h
@@ -856,7 +856,6 @@ private:
 
   int _get_tmap(OpContext *ctx, map<string, bufferlist> *out,
 		bufferlist *header);
-  int _copy_up_tmap(OpContext *ctx);
   int _delete_head(OpContext *ctx);
   int _rollback_to(OpContext *ctx, ceph_osd_op& op);
 public:
diff --git a/src/osd/osd_types.h b/src/osd/osd_types.h
index 72ee32c4cc5..59b71cc6f67 100644
--- a/src/osd/osd_types.h
+++ b/src/osd/osd_types.h
@@ -2101,7 +2101,7 @@ struct object_info_t {
     FLAG_WHITEOUT = 1<<1,  // object logically does not exist
     FLAG_DIRTY    = 1<<2,  // object has been modified since last flushed or undirtied
     // ...
-    FLAG_USES_TMAP = 1<<8,
+    FLAG_USES_TMAP = 1<<8,  // deprecated; no longer used.
   } flag_t;
 
   flag_t flags;