[t:4778] upgrade subtree estimates to stat64info using real code. fix #4778

refactor existing node deserialization code so that upgrading a header can
call deserialization code on the root node and get stat64info instead of
deserializing it manually.


git-svn-id: file:///svn/toku/tokudb@43459 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt-serialize.c

@@ -1684,7 +1684,8 @@ deserialize_brtnode_header_from_rbuf_if_small_enough (BRTNODE *brtnode,
 static int
 deserialize_and_upgrade_internal_node(BRTNODE node,
                                       struct rbuf *rb,
-                                      struct brtnode_fetch_extra* bfe)
+                                      struct brtnode_fetch_extra* bfe,
+                                      STAT64INFO info)
 {
     int r = 0;
     int version = node->layout_version_read_from_disk;
@@ -1700,10 +1701,17 @@ deserialize_and_upgrade_internal_node(BRTNODE node,
         if (version == BRT_LAST_LAYOUT_VERSION_WITH_FINGERPRINT) {
             (void) rbuf_int(rb);  // 8. fingerprint
         }
-        (void) rbuf_ulonglong(rb);  // 9. nkeys (ulonglong)
-        (void) rbuf_ulonglong(rb);  // 10. ndata (ulonglong)
-        (void) rbuf_ulonglong(rb);  // 11. dsize (ulonglong)
+        uint64_t nkeys = rbuf_ulonglong(rb);
+        uint64_t ndata = rbuf_ulonglong(rb);
+        uint64_t dsize = rbuf_ulonglong(rb);
         (void) rbuf_char(rb);       // 12. exact (char)
+        invariant(nkeys == ndata);
+        if (info) {
+            // info is non-null if we're trying to upgrade old subtree
+            // estimates to stat64info
+            info->numrows += nkeys;
+            info->numbytes += dsize;
+        }
     }
 
     node->childkeys = NULL;
@@ -1897,16 +1905,24 @@ deserialize_and_upgrade_internal_node(BRTNODE node,
 static int
 deserialize_and_upgrade_leaf_node(BRTNODE node,
                                   struct rbuf *rb,
-                                  struct brtnode_fetch_extra* bfe)
+                                  struct brtnode_fetch_extra* bfe,
+                                  STAT64INFO info)
 {
     int r = 0;
     int version = node->layout_version_read_from_disk;
 
     // This is a leaf node, so the offsets in the buffer will be
     // different from the internal node offsets above.
-    (void) rbuf_ulonglong(rb);  // 6. nkeys
-    (void) rbuf_ulonglong(rb);  // 7. ndata
-    (void) rbuf_ulonglong(rb);  // 8. dsize
+    uint64_t nkeys = rbuf_ulonglong(rb);  // 6. nkeys
+    uint64_t ndata = rbuf_ulonglong(rb);  // 7. ndata
+    uint64_t dsize = rbuf_ulonglong(rb);  // 8. dsize
+    invariant(nkeys == ndata);
+    if (info) {
+        // info is non-null if we're trying to upgrade old subtree
+        // estimates to stat64info
+        info->numrows += nkeys;
+        info->numbytes += dsize;
+    }
 
     if (version == BRT_LAYOUT_VERSION_14) {
         (void) rbuf_int(rb);  // 9. optimized_for_upgrade
@@ -2078,6 +2094,7 @@ deserialize_and_upgrade_brtnode(BRTNODE node,
                                 BRTNODE_DISK_DATA* ndd,
                                 BLOCKNUM blocknum,
                                 struct brtnode_fetch_extra* bfe,
+                                STAT64INFO info,
                                 int fd)
 {
     int r = 0;
@@ -2135,9 +2152,9 @@ deserialize_and_upgrade_brtnode(BRTNODE node,
 
     // Check height to determine whether this is a leaf node or not.
     if (node->height > 0) {
-        r = deserialize_and_upgrade_internal_node(node, &rb, bfe);
+        r = deserialize_and_upgrade_internal_node(node, &rb, bfe, info);
     } else {
-        r = deserialize_and_upgrade_leaf_node(node, &rb, bfe);
+        r = deserialize_and_upgrade_leaf_node(node, &rb, bfe, info);
     }
 
     *ndd = toku_xmalloc(node->n_children*sizeof(**ndd));
@@ -2160,6 +2177,7 @@ deserialize_brtnode_from_rbuf(
     BLOCKNUM blocknum,
     u_int32_t fullhash,
     struct brtnode_fetch_extra* bfe,
+    STAT64INFO info,
     struct rbuf *rb,
     int fd
     )
@@ -2192,7 +2210,7 @@ deserialize_brtnode_from_rbuf(
     // Check if we are reading in an older node version.
     if (version <= BRT_LAYOUT_VERSION_14) {
         // Perform the upgrade.
-        r = deserialize_and_upgrade_brtnode(node, ndd, blocknum, bfe, fd);
+        r = deserialize_and_upgrade_brtnode(node, ndd, blocknum, bfe, info, fd);
         if (r != 0) {
             goto cleanup;
         }
@@ -2407,6 +2425,32 @@ toku_deserialize_bp_from_compressed(BRTNODE node, int childnum,
     return e;
 }
 
+static enum deserialize_error_code
+deserialize_brtnode_from_fd(int fd,
+                            BLOCKNUM blocknum,
+                            u_int32_t fullhash,
+                            BRTNODE *brtnode,
+                            BRTNODE_DISK_DATA *ndd,
+                            struct brtnode_fetch_extra *bfe,
+                            STAT64INFO info)
+{
+    enum deserialize_error_code e;
+    struct rbuf rb = RBUF_INITIALIZER;
+    int r = 0;
+    r = read_block_from_fd_into_rbuf(fd, blocknum, bfe->h, &rb);
+    if (r != 0) {
+        e = DS_ERRNO;
+        goto cleanup;
+    } // if we were successful, then we are done.
+
+    e = deserialize_brtnode_from_rbuf(brtnode, ndd, blocknum, fullhash, bfe, info, &rb, fd);
+    if (e != DS_OK) {
+        dump_bad_block(rb.buf,rb.size);
+    }
+cleanup:
+    toku_free(rb.buf);
+    return e;
+}
 
 // Read brt node from file into struct.  Perform version upgrade if necessary.
 enum deserialize_error_code 
@@ -2415,7 +2459,8 @@ toku_deserialize_brtnode_from (int fd,
                                u_int32_t fullhash,
                                BRTNODE *brtnode,
                                BRTNODE_DISK_DATA* ndd,
-                               struct brtnode_fetch_extra* bfe)
+                               struct brtnode_fetch_extra* bfe
+    )
 // Effect: Read a node in.  If possible, read just the header.
 {
     toku_trace("deserial start");
@@ -2424,27 +2469,12 @@ toku_deserialize_brtnode_from (int fd,
     read_brtnode_header_from_fd_into_rbuf_if_small_enough(fd, blocknum, bfe->h, &rb);
 
     e = deserialize_brtnode_header_from_rbuf_if_small_enough(brtnode, ndd, blocknum, fullhash, bfe, &rb, fd);
-    if (e != DS_OK) { //<CER> ??? Change this to != DS_OK?
-        e = DS_OK;
-	toku_free(rb.buf);
-	rb = RBUF_INITIALIZER;
-	
-	// Something went wrong, go back to doing it the old way.
-        int r = 0;
-	r = read_block_from_fd_into_rbuf(fd, blocknum, bfe->h, &rb);
-	if (r != 0) {
-            e = DS_ERRNO;
-            goto cleanup;
-        } // if we were successful, then we are done.
-
-	e = deserialize_brtnode_from_rbuf(brtnode, ndd, blocknum, fullhash, bfe, &rb, fd);
     if (e != DS_OK) {
-	    dump_bad_block(rb.buf,rb.size);
-	}
+	// Something went wrong, go back to doing it the old way.
+        e = deserialize_brtnode_from_fd(fd, blocknum, fullhash, brtnode, ndd, bfe, NULL);
     }
     toku_trace("deserial done");
 
-cleanup:
     toku_free(rb.buf);
     return e;
 }
@@ -2744,122 +2774,26 @@ exit:
 }
 
 static enum deserialize_error_code
-upgrade_subtree_estimates_to_stat64info(int UU(fd), struct brt_header *h)
+upgrade_subtree_estimates_to_stat64info(int fd, struct brt_header *h)
 {
-    int r;
-    enum deserialize_error_code e = DS_OK;
+    enum deserialize_error_code e;
     // 15 was the last version with subtree estimates
     invariant(h->layout_version_read_from_disk <= BRT_LAYOUT_VERSION_15);
-    BLOCKNUM b = h->root_blocknum;
-    struct rbuf rb_s;
-    struct rbuf *rb = &rb_s;
-    rbuf_init(rb, NULL, 0);
-    DISKOFF offset, size;
-    toku_translate_blocknum_to_offset_size(h->blocktable, b, &offset, &size);
-    {
-        u_int8_t *XMALLOC_N(size, raw_block);
-        {
-            ssize_t rlen = pread(fd, raw_block, size, offset);
-            lazy_assert((DISKOFF)rlen == size);
-        }
-        {
-            // root node must be a leaf or nonleaf node
-            u_int8_t *magic = raw_block + uncompressed_magic_offset;
-            invariant(memcmp(magic, "tokuleaf", 8) == 0 || memcmp(magic, "tokunode", 8) == 0);
-            // root node cannot have a different version from the header, if
-            // the header needs to read its subtree estimates
-            u_int8_t *version = raw_block + uncompressed_version_offset;
-            int layout_version = toku_dtoh32(*(uint32_t*)version);
-            invariant(layout_version == h->layout_version_read_from_disk);
-        }
-        {
-            int n_sub_blocks = toku_dtoh32(*(u_int32_t*)&raw_block[node_header_overhead]);
-            invariant(0 <= n_sub_blocks && n_sub_blocks <= max_sub_blocks);
-            {
-                u_int32_t header_length = node_header_overhead + sub_block_header_size(n_sub_blocks);
-                invariant(header_length <= size);
-                u_int32_t xsum = x1764_memory(raw_block, header_length);
-                u_int32_t stored_xsum = toku_dtoh32(*(u_int32_t *)(raw_block + header_length));
-                if (xsum != stored_xsum) {
-                    e = DS_XSUM_FAIL;
-                    goto exit;
-                }
-            }
-            struct sub_block sub_block[n_sub_blocks];
-            u_int32_t *sub_block_header = (u_int32_t *) &raw_block[node_header_overhead + 4];
-            size_t uncompressed_size = 0;
-            for (int i = 0; i < n_sub_blocks; ++i) {
-                sub_block_init(&sub_block[i]);
-                int64_t csize = toku_dtoh32(sub_block_header[0]);
-                int64_t usize = toku_dtoh32(sub_block_header[1]);
-                invariant(0 <= csize && csize < (1<<30));
-                invariant(0 <= usize && usize < (1<<30));
-                sub_block[i].compressed_size = csize;
-                sub_block[i].uncompressed_size = usize;
-                sub_block[i].xsum = toku_dtoh32(sub_block_header[2]);
-                uncompressed_size += sub_block[i].uncompressed_size;
-                sub_block_header += 3;
-            }
-            unsigned char *buf = toku_xmalloc(node_header_overhead + uncompressed_size);
-            resource_assert(buf);
-            rbuf_init(rb, buf, node_header_overhead + uncompressed_size);
-            memcpy(rb->buf, raw_block, node_header_overhead);
-            unsigned char *compressed_data = raw_block + node_header_overhead + sub_block_header_size(n_sub_blocks) + sizeof(u_int32_t);
-            unsigned char *uncompressed_data = rb->buf + node_header_overhead;
-            r = decompress_all_sub_blocks(n_sub_blocks, sub_block, compressed_data, uncompressed_data, num_cores, brt_pool);
-            if (r != 0) {
-                fprintf(stderr, "%s:%d block %"PRId64" failed %d at %p size %"PRId64"\n", __FUNCTION__, __LINE__, b.b, r, raw_block, size);
-                dump_bad_block(raw_block, size);
-                fprintf(stderr, "Unknown failure while reading node in file %s.\n", toku_cachefile_fname_in_env(h->cf)); 
-            }
-            lazy_assert_zero(r);
-            rb->ndone = 0;
-        }
-        toku_free(raw_block);
-    }
-    resource_assert(rb->buf);
-    bytevec magic;
-    rbuf_literal_bytes(rb, &magic, 8);
-    int node_version = rbuf_int(rb);
-    invariant(node_version == h->layout_version_read_from_disk);
-    (void) rbuf_int(rb); // layout_version_original
-    (void) rbuf_int(rb); // build_id
-    (void) rbuf_int(rb); // nodesize
-    (void) rbuf_int(rb); // flags
-    int height = rbuf_int(rb);
-    if (node_version <= BRT_LAST_LAYOUT_VERSION_WITH_FINGERPRINT) {
-        (void) rbuf_int(rb); // rand4fingerprint
-        (void) rbuf_int(rb); // localfingerprint
-        (void) rbuf_int(rb); // another fingerprint (according to deserialize_brtnode_nonleaf_from_rbuf in 5.0.8)
-    }
-    h->on_disk_stats = ZEROSTATS;
-    if (height > 0) {
-        invariant(memcmp(magic, "tokunode", 8) == 0);
-        int n_children = rbuf_int(rb);
-        for (int i = 0; i < n_children; ++i) {
-            if (node_version <= BRT_LAST_LAYOUT_VERSION_WITH_FINGERPRINT) {
-                (void) rbuf_int(rb); // child fingerprint
-            }
-            u_int64_t nkeys = rbuf_ulonglong(rb);
-            u_int64_t ndata = rbuf_ulonglong(rb);
-            invariant(nkeys == ndata);
-            h->on_disk_stats.numrows += nkeys;
-            h->on_disk_stats.numbytes += rbuf_ulonglong(rb);
-            (void) rbuf_char(rb); // exact
-        }
-    } else {
-        invariant(memcmp(magic, "tokuleaf", 8) == 0);
-        u_int64_t nkeys = rbuf_ulonglong(rb);
-        u_int64_t ndata = rbuf_ulonglong(rb);
-        invariant(nkeys == ndata);
-        h->on_disk_stats.numrows += nkeys;
-        h->on_disk_stats.numbytes += rbuf_ulonglong(rb);
-    }
+
+    BRTNODE unused_node = NULL;
+    BRTNODE_DISK_DATA unused_ndd = NULL;
+    struct brtnode_fetch_extra bfe;
+    fill_bfe_for_min_read(&bfe, h);
+    e = deserialize_brtnode_from_fd(fd, h->root_blocknum, 0, &unused_node, &unused_ndd,
+                                    &bfe, &h->on_disk_stats);
     h->in_memory_stats = h->on_disk_stats;
 
-    // done, discard the rest
-    toku_free(rb->buf);
-exit:
+    if (unused_node) {
+        toku_brtnode_free(&unused_node);
+    }
+    if (unused_ndd) {
+        toku_free(unused_ndd);
+    }
     return e;
 }