From: Igor Fedotov <ifedotov@suse.com>
Date: Fri, 25 Sep 2020 18:34:43 +0000 (+0300)
Subject: os/bluestore: upgrade omap naming scheme to be per-pg
X-Git-Tag: v16.1.0~152^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F38651%2Fhead;p=ceph.git

os/bluestore: upgrade omap naming scheme to be per-pg

Signed-off-by: Igor Fedotov <ifedotov@suse.com>
---

diff --git a/src/common/options.cc b/src/common/options.cc
index 57901687e77f..858ec9fc2801 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -4538,7 +4538,7 @@ std::vector<Option> get_global_options() {
     .set_description("Enable use of rocksdb column families for bluestore metadata"),
 
     Option("bluestore_rocksdb_cfs", Option::TYPE_STR, Option::LEVEL_DEV)
-    .set_default("m(3) O(3,0-13) L")
+    .set_default("m(3) p(3,0-12) O(3,0-13) L")
     .set_description("Definition of column families and their sharding")
     .set_long_description("Space separated list of elements: column_def [ '=' rocksdb_options ]. "
 			  "column_def := column_name [ '(' shard_count [ ',' hash_begin '-' [ hash_end ] ] ')' ]. "
diff --git a/src/mon/PGMap.cc b/src/mon/PGMap.cc
index d834a42e1a53..0faf477c7d53 100644
--- a/src/mon/PGMap.cc
+++ b/src/mon/PGMap.cc
@@ -3261,8 +3261,8 @@ void PGMap::get_health_checks(
 	summary += " reporting legacy (not per-pool) BlueStore stats";
       } else if (asum.first == "BLUESTORE_DISK_SIZE_MISMATCH") {
 	summary += " have dangerous mismatch between BlueStore block device and free list sizes";
-      } else if (asum.first == "BLUESTORE_NO_PER_POOL_OMAP") {
-	summary += " reporting legacy (not per-pool) BlueStore omap usage stats";
+      } else if (asum.first == "BLUESTORE_NO_PER_PG_OMAP") {
+	summary += " reporting legacy (not per-pg) BlueStore omap usage stats";
       } else if (asum.first == "BLUESTORE_SPURIOUS_READ_ERRORS") {
         summary += " have spurious read errors";
       }
diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 4fbafc56c69d..e2ce432ac87a 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -113,6 +113,7 @@ const string PREFIX_OBJ = "O";         // object name -> onode_t
 const string PREFIX_OMAP = "M";        // u64 + keyname -> value
 const string PREFIX_PGMETA_OMAP = "P"; // u64 + keyname -> value(for meta coll)
 const string PREFIX_PERPOOL_OMAP = "m"; // s64 + u64 + keyname -> value
+const string PREFIX_PERPG_OMAP = "p";   // u64(pool) + u32(hash) + u64(id) + keyname -> value
 const string PREFIX_DEFERRED = "L";    // id -> deferred_transaction_t
 const string PREFIX_ALLOC = "B";       // u64 offset -> u64 length (freelist)
 const string PREFIX_ALLOC_BITMAP = "b";// (see BitmapFreelistManager)
@@ -273,8 +274,8 @@ static const char *_key_decode_shard(const char *key, shard_id_t *pshard)
 }
 
 static void get_coll_range(const coll_t& cid, int bits,
-                           ghobject_t *temp_start, ghobject_t *temp_end,
-                           ghobject_t *start, ghobject_t *end)
+  ghobject_t *temp_start, ghobject_t *temp_end,
+  ghobject_t *start, ghobject_t *end)
 {
   spg_t pgid;
   if (cid.is_pg(&pgid)) {
@@ -468,7 +469,6 @@ static void get_object_key(CephContext *cct, const ghobject_t& oid, S *key)
   }
 }
 
-
 // extent shard keys are the onode key, plus a u32, plus 'x'.  the trailing
 // char lets us quickly test whether it is a shard key without decoding any
 // of the prefix bytes.
@@ -3601,6 +3601,9 @@ const string& BlueStore::Onode::get_omap_prefix()
   if (onode.is_pgmeta_omap()) {
     return PREFIX_PGMETA_OMAP;
   }
+  if (onode.is_perpg_omap()) {
+    return PREFIX_PERPG_OMAP;
+  }
   if (onode.is_perpool_omap()) {
     return PREFIX_PERPOOL_OMAP;
   }
@@ -3611,8 +3614,13 @@ const string& BlueStore::Onode::get_omap_prefix()
 
 void BlueStore::Onode::get_omap_header(string *out)
 {
-  if (onode.is_perpool_omap() && !onode.is_pgmeta_omap()) {
-    _key_encode_u64(c->pool(), out);
+  if (!onode.is_pgmeta_omap()) {
+    if (onode.is_perpg_omap()) {
+      _key_encode_u64(c->pool(), out);
+      _key_encode_u32(oid.hobj.get_bitwise_key_u32(), out);
+    } else if (onode.is_perpool_omap()) {
+      _key_encode_u64(c->pool(), out);
+    }
   }
   _key_encode_u64(onode.nid, out);
   out->push_back('-');
@@ -3620,8 +3628,13 @@ void BlueStore::Onode::get_omap_header(string *out)
 
 void BlueStore::Onode::get_omap_key(const string& key, string *out)
 {
-  if (onode.is_perpool_omap() && !onode.is_pgmeta_omap()) {
-    _key_encode_u64(c->pool(), out);
+  if (!onode.is_pgmeta_omap()) {
+    if (onode.is_perpg_omap()) {
+      _key_encode_u64(c->pool(), out);
+      _key_encode_u32(oid.hobj.get_bitwise_key_u32(), out);
+    } else if (onode.is_perpool_omap()) {
+      _key_encode_u64(c->pool(), out);
+    }
   }
   _key_encode_u64(onode.nid, out);
   out->push_back('.');
@@ -3630,8 +3643,13 @@ void BlueStore::Onode::get_omap_key(const string& key, string *out)
 
 void BlueStore::Onode::rewrite_omap_key(const string& old, string *out)
 {
-  if (onode.is_perpool_omap() && !onode.is_pgmeta_omap()) {
-    _key_encode_u64(c->pool(), out);
+  if (!onode.is_pgmeta_omap()) {
+    if (onode.is_perpg_omap()) {
+      _key_encode_u64(c->pool(), out);
+      _key_encode_u32(oid.hobj.get_bitwise_key_u32(), out);
+    } else if (onode.is_perpool_omap()) {
+      _key_encode_u64(c->pool(), out);
+    }
   }
   _key_encode_u64(onode.nid, out);
   out->append(old.c_str() + out->length(), old.size() - out->length());
@@ -3639,8 +3657,13 @@ void BlueStore::Onode::rewrite_omap_key(const string& old, string *out)
 
 void BlueStore::Onode::get_omap_tail(string *out)
 {
-  if (onode.is_perpool_omap() && !onode.is_pgmeta_omap()) {
-    _key_encode_u64(c->pool(), out);
+  if (!onode.is_pgmeta_omap()) {
+    if (onode.is_perpg_omap()) {
+      _key_encode_u64(c->pool(), out);
+      _key_encode_u32(oid.hobj.get_bitwise_key_u32(), out);
+    } else if (onode.is_perpool_omap()) {
+      _key_encode_u64(c->pool(), out);
+    }
   }
   _key_encode_u64(onode.nid, out);
   out->push_back('~');
@@ -3648,11 +3671,15 @@ void BlueStore::Onode::get_omap_tail(string *out)
 
 void BlueStore::Onode::decode_omap_key(const string& key, string *user_key)
 {
-  if (onode.is_perpool_omap() && !onode.is_pgmeta_omap()) {
-    *user_key = key.substr(sizeof(uint64_t)*2 + 1);
-  } else {
-    *user_key = key.substr(sizeof(uint64_t) + 1);
+  size_t pos = sizeof(uint64_t) + 1;
+  if (!onode.is_pgmeta_omap()) {
+    if (onode.is_perpg_omap()) {
+      pos += sizeof(uint64_t) + sizeof(uint32_t);
+    } else if (onode.is_perpool_omap()) {
+      pos += sizeof(uint64_t);
+    }
   }
+  *user_key = key.substr(pos);
 }
 
 
@@ -4505,7 +4532,7 @@ void BlueStore::handle_conf_change(const ConfigProxy& conf,
     _check_legacy_statfs_alert();
   }
   if (changed.count("bluestore_warn_on_no_per_pool_omap")) {
-    _check_no_per_pool_omap_alert();
+    _check_no_per_pg_omap_alert();
   }
 
   if (changed.count("bluestore_csum_type")) {
@@ -6139,16 +6166,22 @@ void BlueStore::_fsck_collections(int64_t* errors)
 
 void BlueStore::_set_per_pool_omap()
 {
-  per_pool_omap = false;
+  per_pool_omap = OMAP_BULK;
   bufferlist bl;
   db->get(PREFIX_SUPER, "per_pool_omap", &bl);
   if (bl.length()) {
-    per_pool_omap = true;
-    dout(10) << __func__ << " per_pool_omap=1" << dendl;
+    auto s = bl.to_str();
+    if (s == stringify(OMAP_PER_POOL)) {
+      per_pool_omap = OMAP_PER_POOL;
+    } else {
+      ceph_assert(s == stringify(OMAP_PER_PG));
+      per_pool_omap = OMAP_PER_PG;
+    }
+    dout(10) << __func__ << " per_pool_omap = " << per_pool_omap << dendl;
   } else {
     dout(10) << __func__ << " per_pool_omap not present" << dendl;
   }
-  _check_no_per_pool_omap_alert();
+  _check_no_per_pg_omap_alert();
 }
 
 void BlueStore::_open_statfs()
@@ -6445,7 +6478,7 @@ int BlueStore::mkfs()
     }
     {
       bufferlist bl;
-      bl.append("1");
+      bl.append(stringify(OMAP_PER_PG));
       t->set(PREFIX_SUPER, "per_pool_omap", bl);
     }
     ondisk_format = latest_ondisk_format;
@@ -6922,10 +6955,10 @@ int BlueStore::_mount()
 
   mempool_thread.init();
 
-  if ((!per_pool_stat_collection || !per_pool_omap) &&
+  if ((!per_pool_stat_collection || per_pool_omap != OMAP_PER_PG) &&
     cct->_conf->bluestore_fsck_quick_fix_on_mount == true) {
 
-    bool was_per_pool_omap = per_pool_omap;
+    auto was_per_pool_omap = per_pool_omap;
 
     dout(1) << __func__ << " quick-fix on mount" << dendl;
     _fsck_on_open(FSCK_SHALLOW, true);
@@ -6936,7 +6969,7 @@ int BlueStore::_mount()
     _check_legacy_statfs_alert();
 
     //set again as hopefully it has been fixed
-    if (!was_per_pool_omap) {
+    if (was_per_pool_omap != OMAP_PER_PG) {
       _set_per_pool_omap();
     }
   }
@@ -7633,11 +7666,11 @@ void BlueStore::_fsck_check_object_omap(FSCKDepth depth,
   auto repairer = ctx.repairer;
 
   ceph_assert(o->onode.has_omap());
-  if (!o->onode.is_perpool_omap() && !o->onode.is_pgmeta_omap()) {
-    if (per_pool_omap) {
+  if (!o->onode.is_perpg_omap() && !o->onode.is_pgmeta_omap()) {
+    if (per_pool_omap == OMAP_PER_PG) {
       fsck_derr(errors, MAX_FSCK_ERROR_LINES)
         << "fsck error: " << o->oid
-        << " has omap that is not per-pool or pgmeta"
+        << " has omap that is not per-pg or pgmeta"
         << fsck_dendl;
       ++errors;
     } else {
@@ -7654,14 +7687,14 @@ void BlueStore::_fsck_check_object_omap(FSCKDepth depth,
       }
       fsck_derr(num, MAX_FSCK_ERROR_LINES)
         << "fsck " << w << ": " << o->oid
-        << " has omap that is not per-pool or pgmeta"
+        << " has omap that is not per-pg or pgmeta"
         << fsck_dendl;
     }
   }
   if (repairer &&
-    !o->onode.is_perpool_omap() &&
+    !o->onode.is_perpg_omap() &&
     !o->onode.is_pgmeta_omap()) {
-    dout(10) << "fsck converting " << o->oid << " omap to per-pool" << dendl;
+    dout(10) << "fsck converting " << o->oid << " omap to per-pg" << dendl;
     bufferlist h;
     map<string, bufferlist> kv;
     int r = _onode_omap_get(o, &h, &kv);
@@ -7677,7 +7710,7 @@ void BlueStore::_fsck_check_object_omap(FSCKDepth depth,
       txn->rm_range_keys(old_omap_prefix, old_head, old_tail);
       txn->rmkey(old_omap_prefix, old_tail);
       // set flag
-      o->onode.set_flag(bluestore_onode_t::FLAG_PERPOOL_OMAP);
+      o->onode.set_flag(bluestore_onode_t::FLAG_PERPOOL_OMAP | bluestore_onode_t::FLAG_PERPG_OMAP);
       _record_onode(o, txn);
       const string& new_omap_prefix = o->get_omap_prefix();
       // head
@@ -8135,7 +8168,7 @@ int BlueStore::_fsck_on_open(BlueStore::FSCKDepth depth, bool repair)
     derr << "fsck " << w << ": store not yet converted to per-pool stats"
 	 << dendl;
   }
-  if (!per_pool_omap) {
+  if (per_pool_omap != OMAP_PER_PG) {
     const char *w;
     if (cct->_conf->bluestore_fsck_error_on_no_per_pool_omap) {
       w = "error";
@@ -8144,7 +8177,7 @@ int BlueStore::_fsck_on_open(BlueStore::FSCKDepth depth, bool repair)
       w = "warning";
       ++warnings;
     }
-    derr << "fsck " << w << ": store not yet converted to per-pool omap"
+    derr << "fsck " << w << ": store not yet converted to per-pg omap"
 	 << dendl;
   }
 
@@ -8514,14 +8547,16 @@ int BlueStore::_fsck_on_open(BlueStore::FSCKDepth depth, bool repair)
       uint64_t last_omap_head = 0;
       for (it->lower_bound(string()); it->valid(); it->next()) {
         uint64_t omap_head;
+
         _key_decode_u64(it->key().c_str(), &omap_head);
+
         if (used_omap_head.count(omap_head) == 0 &&
-	    omap_head != last_omap_head) {
+           omap_head != last_omap_head) {
           fsck_derr(errors, MAX_FSCK_ERROR_LINES)
             << "fsck error: found stray omap data on omap_head "
-            << omap_head << " " << last_omap_head << " " << used_omap_head.count(omap_head)<< fsck_dendl;
-	  ++errors;
-	  last_omap_head = omap_head;
+            << omap_head << " " << last_omap_head << " " << used_omap_head.count(omap_head) << fsck_dendl;
+          ++errors;
+          last_omap_head = omap_head;
         }
       }
     }
@@ -8547,17 +8582,37 @@ int BlueStore::_fsck_on_open(BlueStore::FSCKDepth depth, bool repair)
       for (it->lower_bound(string()); it->valid(); it->next()) {
         uint64_t pool;
         uint64_t omap_head;
-        string k = it->key();
-        const char *c = k.c_str();
+        const char *c = it->key().c_str();
         c = _key_decode_u64(c, &pool);
         c = _key_decode_u64(c, &omap_head);
         if (used_omap_head.count(omap_head) == 0 &&
-	    omap_head != last_omap_head) {
+          omap_head != last_omap_head) {
           fsck_derr(errors, MAX_FSCK_ERROR_LINES)
             << "fsck error: found stray (per-pool) omap data on omap_head "
             << omap_head << " " << last_omap_head << " " << used_omap_head.count(omap_head) << fsck_dendl;
           ++errors;
-	  last_omap_head = omap_head;
+          last_omap_head = omap_head;
+        }
+      }
+    }
+    it = db->get_iterator(PREFIX_PERPG_OMAP, KeyValueDB::ITERATOR_NOCACHE);
+    if (it) {
+      uint64_t last_omap_head = 0;
+      for (it->lower_bound(string()); it->valid(); it->next()) {
+        uint64_t pool;
+        uint32_t hash;
+        uint64_t omap_head;
+        const char* c = it->key().c_str();
+        c = _key_decode_u64(c, &pool);
+        c = _key_decode_u32(c, &hash);
+        c = _key_decode_u64(c, &omap_head);
+        if (used_omap_head.count(omap_head) == 0 &&
+          omap_head != last_omap_head) {
+          fsck_derr(errors, MAX_FSCK_ERROR_LINES)
+            << "fsck error: found stray (per-pg) omap data on omap_head "
+            << omap_head << " " << last_omap_head << " " << used_omap_head.count(omap_head) << fsck_dendl;
+          ++errors;
+          last_omap_head = omap_head;
         }
       }
     }
@@ -8669,9 +8724,9 @@ int BlueStore::_fsck_on_open(BlueStore::FSCKDepth depth, bool repair)
     }
   }
   if (repair) {
-    if (!per_pool_omap) {
-      dout(5) << __func__ << " marking per_pool_omap=1" << dendl;
-      repairer.fix_per_pool_omap(db);
+    if (per_pool_omap != OMAP_PER_PG) {
+      dout(5) << __func__ << " fixing per_pg_omap" << dendl;
+      repairer.fix_per_pool_omap(db, OMAP_PER_PG);
     }
 
     dout(5) << __func__ << " applying repair results" << dendl;
@@ -8775,7 +8830,7 @@ void BlueStore::inject_false_free(coll_t cid, ghobject_t oid)
 void BlueStore::inject_legacy_omap()
 {
   dout(1) << __func__ << dendl;
-  per_pool_omap = false;
+  per_pool_omap = OMAP_BULK;
   KeyValueDB::Transaction txn;
   txn = db->get_transaction();
   txn->rmkey(PREFIX_SUPER, "per_pool_omap");
@@ -8796,7 +8851,10 @@ void BlueStore::inject_legacy_omap(coll_t cid, ghobject_t oid)
     o = c->get_onode(oid, false);
     ceph_assert(o);
   }
-  o->onode.clear_flag(bluestore_onode_t::FLAG_PERPOOL_OMAP | bluestore_onode_t::FLAG_PGMETA_OMAP);
+  o->onode.clear_flag(
+    bluestore_onode_t::FLAG_PERPG_OMAP |
+    bluestore_onode_t::FLAG_PERPOOL_OMAP |
+    bluestore_onode_t::FLAG_PGMETA_OMAP);
   txn = db->get_transaction();
   _record_onode(o, txn);
   db->submit_transaction_sync(txn);
@@ -8993,9 +9051,13 @@ void BlueStore::_get_statfs_overall(struct store_statfs_t *buf)
 {
   buf->reset();
 
+  auto prefix = per_pool_omap == OMAP_BULK ?
+    PREFIX_OMAP :
+    per_pool_omap == OMAP_PER_POOL ?
+      PREFIX_PERPOOL_OMAP :
+      PREFIX_PERPG_OMAP;
   buf->omap_allocated =
-    db->estimate_prefix_size(PREFIX_OMAP, string()) +
-    db->estimate_prefix_size(PREFIX_PERPOOL_OMAP, string());
+    db->estimate_prefix_size(prefix, string());
 
   uint64_t bfree = shared_alloc.a->get_free();
 
@@ -9065,9 +9127,13 @@ int BlueStore::pool_statfs(uint64_t pool_id, struct store_statfs_t *buf,
 
   string key_prefix;
   _key_encode_u64(pool_id, &key_prefix);
-  buf->omap_allocated = db->estimate_prefix_size(PREFIX_PERPOOL_OMAP,
-						 key_prefix);
-  *out_per_pool_omap = per_pool_omap;
+  *out_per_pool_omap = per_pool_omap != OMAP_BULK;
+  if (*out_per_pool_omap) {
+    auto prefix = per_pool_omap == OMAP_PER_POOL ?
+      PREFIX_PERPOOL_OMAP :
+      PREFIX_PERPG_OMAP;
+    buf->omap_allocated = db->estimate_prefix_size(prefix, key_prefix);
+  }
 
   dout(10) << __func__ << *buf << dendl;
   return 0;
@@ -9085,16 +9151,16 @@ void BlueStore::_check_legacy_statfs_alert()
   legacy_statfs_alert = s;
 }
 
-void BlueStore::_check_no_per_pool_omap_alert()
+void BlueStore::_check_no_per_pg_omap_alert()
 {
   string s;
-  if (!per_pool_omap &&
+  if (per_pool_omap != OMAP_PER_PG &&
       cct->_conf->bluestore_warn_on_no_per_pool_omap) {
-    s = "legacy (not per-pool) omap detected, "
-      "suggest to run store repair to measure per-pool omap usage";
+    s = "legacy (not per-pg) omap detected, "
+      "suggest to run store repair to benefit from per-pool omap usage statistic and faster PG removal";
   }
   std::lock_guard l(qlock);
-  no_per_pool_omap_alert = s;
+  no_per_pg_omap_alert = s;
 }
 
 // ---------------
@@ -10915,8 +10981,8 @@ int BlueStore::_upgrade_super()
     }
     if (ondisk_format == 2) {
       // changes:
-      // - onode has FLAG_PER_POOL_OMAP.  Note that we do not know that *all*
-      //   ondes are using the per-pool prefix until a repair is run; at that
+      // - onode has FLAG_PERPOOL_OMAP.  Note that we do not know that *all*
+      //   oondes are using the per-pool prefix until a repair is run; at that
       //   point the per_pool_omap=1 key will be set.
       // - super: added per_pool_omap key, which indicates that *all* objects
       //   are using the new prefix and key format
@@ -15150,18 +15216,17 @@ int BlueStore::_remove_collection(TransContext *txc, const coll_t &cid,
     size_t nonexistent_count = 0;
     ceph_assert((*c)->exists);
     if ((*c)->onode_map.map_any([&](Onode* o) {
-        if (o->exists) {
-          dout(1) << __func__ << " " << o->oid << " " << o
-		  << " exists in onode_map" << dendl;
+      if (o->exists) {
+        dout(1) << __func__ << " " << o->oid << " " << o
+	        << " exists in onode_map" << dendl;
           return true;
-        }
-        ++nonexistent_count;
-        return false;
-        })) {
+      }
+      ++nonexistent_count;
+      return false;
+    })) {
       r = -ENOTEMPTY;
       goto out;
     }
-
     vector<ghobject_t> ls;
     ghobject_t next;
     // Enumerate onodes in db, up to nonexistent_count + 1
@@ -15179,23 +15244,22 @@ int BlueStore::_remove_collection(TransContext *txc, const coll_t &cid,
         exists = !onode || onode->exists;
         if (exists) {
           dout(1) << __func__ << " " << *it
-		  << " exists in db, "
-		  << (!onode ? "not present in ram" : "present in ram")
-		  << dendl;
+	  << " exists in db, "
+	  << (!onode ? "not present in ram" : "present in ram")
+	  << dendl;
         }
       }
       if (!exists) {
-	_do_remove_collection(txc, c);
+        _do_remove_collection(txc, c);
         r = 0;
       } else {
         dout(10) << __func__ << " " << cid
                  << " is non-empty" << dendl;
-        r = -ENOTEMPTY;
+	r = -ENOTEMPTY;
       }
     }
   }
-
- out:
+out:
   dout(10) << __func__ << " " << cid << " = " << r << dendl;
   return r;
 }
@@ -15647,6 +15711,12 @@ void BlueStore::generate_db_histogram(Formatter *f)
     } else if (key.first == PREFIX_OMAP) {
 	hist.update_hist_entry(hist.key_hist, PREFIX_OMAP, key_size, value_size);
 	num_omap++;
+    } else if (key.first == PREFIX_PERPOOL_OMAP) {
+	hist.update_hist_entry(hist.key_hist, PREFIX_PERPOOL_OMAP, key_size, value_size);
+	num_omap++;
+    } else if (key.first == PREFIX_PERPG_OMAP) {
+	hist.update_hist_entry(hist.key_hist, PREFIX_PERPG_OMAP, key_size, value_size);
+	num_omap++;
     } else if (key.first == PREFIX_PGMETA_OMAP) {
 	hist.update_hist_entry(hist.key_hist, PREFIX_PGMETA_OMAP, key_size, value_size);
 	num_pgmeta_omap++;
@@ -15820,10 +15890,10 @@ void BlueStore::_log_alerts(osd_alert_list_t& alerts)
       "BLUEFS_SPILLOVER",
       spillover_alert);
   }
-  if (!no_per_pool_omap_alert.empty()) {
+  if (!no_per_pg_omap_alert.empty()) {
     alerts.emplace(
-      "BLUESTORE_NO_PER_POOL_OMAP",
-      no_per_pool_omap_alert);
+      "BLUESTORE_NO_PER_PG_OMAP",
+      no_per_pg_omap_alert);
   }
   string s0(failed_cmode);
 
@@ -15951,12 +16021,12 @@ bool BlueStoreRepairer::remove_key(KeyValueDB *db,
   return true;
 }
 
-void BlueStoreRepairer::fix_per_pool_omap(KeyValueDB *db)
+void BlueStoreRepairer::fix_per_pool_omap(KeyValueDB *db, int val)
 {
   fix_per_pool_omap_txn = db->get_transaction();
   ++to_repair_cnt;
   bufferlist bl;
-  bl.append("1");
+  bl.append(stringify(val));
   fix_per_pool_omap_txn->set(PREFIX_SUPER, "per_pool_omap", bl);
 }
 
diff --git a/src/os/bluestore/BlueStore.h b/src/os/bluestore/BlueStore.h
index 3b98564c3f2c..1d7e5dd6c043 100644
--- a/src/os/bluestore/BlueStore.h
+++ b/src/os/bluestore/BlueStore.h
@@ -1938,7 +1938,7 @@ public:
 	qcond.wait(l);
 	--kv_submitted_waiters;
       }
-    }
+      }
 
     bool flush_commit(Context *c) {
       std::lock_guard l(qlock);
@@ -2137,7 +2137,12 @@ private:
 		std::numeric_limits<decltype(min_alloc_size)>::digits,
 		"not enough bits for min_alloc_size");
 
-  bool per_pool_omap = false;
+  enum {
+    // Please preserve the order since it's DB persistent
+    OMAP_BULK = 0,
+    OMAP_PER_POOL = 1,
+    OMAP_PER_PG = 2,
+    } per_pool_omap = OMAP_BULK;
 
   ///< maximum allocation unit (power of 2)
   std::atomic<uint64_t> max_alloc_size = {0};
@@ -3042,7 +3047,7 @@ private:
   std::set<std::string> failed_compressors;
   std::string spillover_alert;
   std::string legacy_statfs_alert;
-  std::string no_per_pool_omap_alert;
+  std::string no_per_pg_omap_alert;
   std::string disk_size_mismatch_alert;
   std::string spurious_read_errors_alert;
 
@@ -3072,7 +3077,7 @@ private:
   }
 
   void _check_legacy_statfs_alert();
-  void _check_no_per_pool_omap_alert();
+  void _check_no_per_pg_omap_alert();
   void _set_disk_size_mismatch_alert(const std::string& s) {
     std::lock_guard l(qlock);
     disk_size_mismatch_alert = s;
@@ -3608,7 +3613,7 @@ public:
     }
   };
 public:
-  void fix_per_pool_omap(KeyValueDB *db);
+  void fix_per_pool_omap(KeyValueDB *db, int);
   bool remove_key(KeyValueDB *db, const std::string& prefix, const std::string& key);
   bool fix_shared_blob(KeyValueDB *db,
 		         uint64_t sbid,
diff --git a/src/os/bluestore/bluestore_types.h b/src/os/bluestore/bluestore_types.h
index 72b373f461ef..9a10304e3e2d 100644
--- a/src/os/bluestore/bluestore_types.h
+++ b/src/os/bluestore/bluestore_types.h
@@ -961,9 +961,10 @@ struct bluestore_onode_t {
   uint8_t flags = 0;
 
   enum {
-    FLAG_OMAP = 1,       ///< object may have omap data
+    FLAG_OMAP = 1,         ///< object may have omap data
     FLAG_PGMETA_OMAP = 2,  ///< omap data is in meta omap prefix
     FLAG_PERPOOL_OMAP = 4, ///< omap data is in per-pool prefix; per-pool keys
+    FLAG_PERPG_OMAP = 8,   ///< omap data is in per-pg prefix; per-pg keys
   };
 
   std::string get_flags_string() const {
@@ -975,7 +976,10 @@ struct bluestore_onode_t {
       s += "+pgmeta_omap";
     }
     if (flags & FLAG_PERPOOL_OMAP) {
-      s += "+perpool_omap";
+      s += "+per_pool_omap";
+    }
+    if (flags & FLAG_PERPG_OMAP) {
+      s += "+per_pg_omap";
     }
     return s;
   }
@@ -1001,9 +1005,12 @@ struct bluestore_onode_t {
   bool is_perpool_omap() const {
     return has_flag(FLAG_PERPOOL_OMAP);
   }
+  bool is_perpg_omap() const {
+    return has_flag(FLAG_PERPG_OMAP);
+  }
 
   void set_omap_flags() {
-    set_flag(FLAG_OMAP | FLAG_PERPOOL_OMAP);
+    set_flag(FLAG_OMAP | FLAG_PERPOOL_OMAP | FLAG_PERPG_OMAP);
   }
   void set_omap_flags_pgmeta() {
     set_flag(FLAG_OMAP | FLAG_PGMETA_OMAP);