[t:4281], grab fdlock around reading of fd in bring_node_fully_into_memory

git-svn-id: file:///svn/toku/tokudb@37884 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt.c

@@ -144,13 +144,18 @@ toku_brt_header_suppress_rollbacks(struct brt_header *h, TOKUTXN txn) {
     h->root_that_created_or_locked_when_empty  = rootid;
 }
 
-
+static bool is_entire_node_in_memory(BRTNODE node) {
+    for (int i = 0; i < node->n_children; i++) {
+        if(BP_STATE(node,i) != PT_AVAIL) {
+            return false;
+        }
+    }
+    return true;
+}
 
 void
 toku_assert_entire_node_in_memory(BRTNODE node) {
-    for (int i = 0; i < node->n_children; i++) {
-        assert(BP_STATE(node,i) == PT_AVAIL);
-    }
+    assert(is_entire_node_in_memory(node));
 }
 
 static u_int32_t
@@ -1941,11 +1946,14 @@ toku_bnc_flush_to_child(
 
 void bring_node_fully_into_memory(BRTNODE node, struct brt_header* h)
 {
-    struct brtnode_fetch_extra bfe;
-    PAIR_ATTR attr;
-    int fd = toku_cachefile_fd(h->cf);
-    fill_bfe_for_full_read(&bfe, h);
-    toku_brtnode_pf_callback(node, &bfe, fd, &attr);
+    if (!is_entire_node_in_memory(node)) {
+        struct brtnode_fetch_extra bfe;
+        PAIR_ATTR attr;
+        int fd = toku_cachefile_get_and_pin_fd(h->cf);
+        fill_bfe_for_full_read(&bfe, h);
+        toku_brtnode_pf_callback(node, &bfe, fd, &attr);
+        toku_cachefile_unpin_fd(h->cf);
+    }
 }
 
 static void

newbrt/cachetable.c

@@ -471,10 +471,6 @@ cachefile_refup (CACHEFILE cf) {
     cf->refcount++;
 }
 
-int toku_cachefile_fd(CACHEFILE cf) {
-    return cf->fd;
-}
-
 // What cachefile goes with particular iname (iname relative to env)?
 // The transaction that is adding the reference might not have a reference
 // to the brt, therefore the cachefile might be closing.

newbrt/cachetable.h

@@ -60,10 +60,6 @@ int toku_cachefile_of_iname_in_env (CACHETABLE ct, const char *iname_in_env, CAC
 // Return the filename
 char * toku_cachefile_fname_in_cwd (CACHEFILE cf);
 
-// return the fd
-int toku_cachefile_fd(CACHEFILE cf);
-
-
 // TODO: #1510  Add comments on how these behave
 int toku_cachetable_begin_checkpoint (CACHETABLE ct, TOKULOGGER);
 int toku_cachetable_end_checkpoint(CACHETABLE ct, TOKULOGGER logger,