Merge with 3.23.53

Build-tools/Do-compile:
  Auto merged
innobase/btr/btr0cur.c:
  Auto merged
innobase/os/os0file.c:
  Auto merged
innobase/srv/srv0srv.c:
  Auto merged
innobase/sync/sync0arr.c:
  Auto merged
innobase/trx/trx0undo.c:
  Auto merged
sql/ha_innodb.h:
  Auto merged
Docs/manual.texi:
  merge
sql/ha_innodb.cc:
  merge
sql/mysqld.cc:
  merge

Docs/manual.texi

@@ -51289,6 +51289,9 @@ Linux-x86 binaries.
 
 @itemize @bullet
 @item
+Fixed buffer overflow problem if someone specified a too long datadir
+parameter to mysqld
+@item
 Add missing @code{<row>} tags for @code{mysqldump} XML output.
 @item
 Fixed problem with @code{crash-me} and @code{gcc} 3.0.4.

innobase/btr/btr0cur.c

@@ -302,6 +302,9 @@ btr_cur_search_to_nth_level(
 		rw_lock_s_unlock(&btr_search_latch);
 	}
 
+	/* Store the position of the tree latch we push to mtr so that we
+	know how to release it when we have latched leaf node(s) */
+
 	savepoint = mtr_set_savepoint(mtr);
 
 	tree = index->tree;
@@ -506,12 +509,18 @@ btr_cur_open_at_index_side(
 	ulint		root_height = 0; /* remove warning */
 	rec_t*		node_ptr;
 	ulint		estimate;
+	ulint           savepoint;
 
 	estimate = latch_mode & BTR_ESTIMATE;
 	latch_mode = latch_mode & ~BTR_ESTIMATE;
 	
 	tree = index->tree;
 	
+	/* Store the position of the tree latch we push to mtr so that we
+	know how to release it when we have latched the leaf node */
+
+	savepoint = mtr_set_savepoint(mtr);
+
 	if (latch_mode == BTR_MODIFY_TREE) {
 		mtr_x_lock(dict_tree_get_lock(tree), mtr);
 	} else {
@@ -544,6 +553,22 @@ btr_cur_open_at_index_side(
 		if (height == 0) {
 			btr_cur_latch_leaves(tree, page, space, page_no,
 						latch_mode, cursor, mtr);
+
+			/* In versions <= 3.23.52 we had forgotten to
+			release the tree latch here. If in an index scan
+			we had to scan far to find a record visible to the
+			current transaction, that could starve others
+			waiting for the tree latch. */
+ 
+			if ((latch_mode != BTR_MODIFY_TREE)
+			    && (latch_mode != BTR_CONT_MODIFY_TREE)) {
+
+				/* Release the tree s-latch */
+
+				mtr_release_s_latch_at_savepoint(
+						mtr, savepoint,
+						dict_tree_get_lock(tree));
+			}
 		}
 		
 		if (from_left) {

innobase/os/os0file.c

@@ -2278,7 +2278,7 @@ os_aio_simulated_handle(
 				    	ut_print_timestamp(stderr);
 				    	fprintf(stderr,
 "  InnoDB: ERROR: The page to be written seems corrupt!\n");
-					page_print(combined_buf + len2);
+					buf_page_print(combined_buf + len2);
 				    	fprintf(stderr,
 "InnoDB: ERROR: The page to be written seems corrupt!\n");
 				}

innobase/os/os0sync.c

@@ -49,6 +49,12 @@ os_event_create(
 			TRUE,		/* Manual reset */
 			FALSE,		/* Initial state nonsignaled */
 			name);
+	if (!event) {
+	        fprintf(stderr,
+"InnoDB: Could not create a Windows event semaphore; Windows error %lu\n",
+		  (ulint)GetLastError());
+	}
+
 	ut_a(event);
 
 	return(event);

innobase/srv/srv0srv.c

@@ -2825,7 +2825,11 @@ srv_master_thread(
 		
 	srv_main_thread_op_info = (char*)"purging";
 
+	if (srv_fast_shutdown && srv_shutdown_state > 0) {
+	        n_pages_purged = 0;
+	} else {
 	        n_pages_purged = trx_purge();
+	}
 
 	srv_main_thread_op_info = (char*)"reserving kernel mutex";
 
@@ -2837,7 +2841,12 @@ srv_master_thread(
 	mutex_exit(&kernel_mutex);
 
 	srv_main_thread_op_info = (char*)"doing insert buffer merge";
+
+	if (srv_fast_shutdown && srv_shutdown_state > 0) {
+	        n_bytes_merged = 0;
+	} else {
 	        n_bytes_merged = ibuf_contract_for_n_pages(TRUE, 20);
+	}
 
 	srv_main_thread_op_info = (char*)"reserving kernel mutex";
 

innobase/sync/sync0arr.c

@@ -924,7 +924,7 @@ sync_array_print_long_waits(void)
                 }
 
                 if (cell->wait_object != NULL
-		    && difftime(time(NULL), cell->reservation_time) > 420) {
+		    && difftime(time(NULL), cell->reservation_time) > 600) {
 
 		    	fprintf(stderr,
 "InnoDB: Error: semaphore wait has lasted > 600 seconds\n"

innobase/trx/trx0undo.c

@@ -401,6 +401,10 @@ trx_undo_seg_create(
 	slot_no = trx_rsegf_undo_find_free(rseg_hdr, mtr);
 
 	if (slot_no == ULINT_UNDEFINED) {
+	        ut_print_timestamp(stderr);
+	        fprintf(stderr,
+"InnoDB: Warning: cannot find a free slot for an undo log. Do you have too\n"
+"InnoDB: many active transactions running concurrently?");
 
 		return(NULL);
 	}
@@ -1532,9 +1536,6 @@ trx_undo_assign_undo(
 			mutex_exit(&(rseg->mutex));
 			mtr_commit(&mtr);
 
-			fprintf(stderr,	"InnoDB: no undo log slots free\n");
-			ut_a(0);
-
 			return(NULL);
 		}
 	}

sql/ha_innodb.cc

@@ -101,11 +101,18 @@ char*	innobase_unix_file_flush_method		= NULL;
 /* Below we have boolean-valued start-up parameters, and their default
 values */
 
-uint	innobase_flush_log_at_trx_commit	= 0;
 my_bool innobase_log_archive			= FALSE;
 my_bool	innobase_use_native_aio			= FALSE;
 my_bool	innobase_fast_shutdown			= TRUE;
 
+/* innodb_flush_log_at_trx_commit can now have 3 values:
+0 : write to the log file once per second and flush it to disk;
+1 : write to the log file at each commit and flush it to disk;
+2 : write to the log file at each commit, but flush to disk only once per
+second */
+
+uint    innobase_flush_log_at_trx_commit	= 0;
+
 /*
   Set default InnoDB data file size to 10 MB and let it be
   auto-extending. Thus users can use InnoDB without having to

sql/ha_innodb.h

@@ -182,6 +182,7 @@ extern long innobase_force_recovery, innobase_thread_concurrency;
 extern char *innobase_data_home_dir, *innobase_data_file_path;
 extern char *innobase_log_group_home_dir, *innobase_log_arch_dir;
 extern char *innobase_unix_file_flush_method;
+extern long innobase_flush_log_at_trx_commit;
 /* The following variables have to be my_bool for SHOW VARIABLES to work */
 extern my_bool innobase_log_archive,
                innobase_use_native_aio, innobase_fast_shutdown;

sql/mysqld.cc

@@ -3036,10 +3036,10 @@ struct my_option my_long_options[] =
    "Set to 1 if you want to have logs archived", 0, 0, 0, GET_LONG, OPT_ARG,
    0, 0, 0, 0, 0, 0},
   {"innodb_flush_log_at_trx_commit", OPT_INNODB_FLUSH_LOG_AT_TRX_COMMIT,
-   "Set to 0 if you don't want to flush logs",
+   "Set to 0 (write and flush once per second), 1 (write and flush at each commit) or 2 (write at commit, flush once per second)",
    (gptr*) &innobase_flush_log_at_trx_commit,
    (gptr*) &innobase_flush_log_at_trx_commit,
-   0, GET_INT, OPT_ARG,  0, 0, 2, 0, 0, 0},
+   0, GET_UINT, OPT_ARG,  0, 0, 2, 0, 0, 0},
   {"innodb_flush_method", OPT_INNODB_FLUSH_METHOD,
    "With which method to flush data", (gptr*) &innobase_unix_file_flush_method,
    (gptr*) &innobase_unix_file_flush_method, 0, GET_STR, REQUIRED_ARG, 0, 0, 0,