MDEV-11520: Retry posix_fallocate() after EINTR.

The function posix_fallocate() as well as the Linux system call
fallocate() can return EINTR when the operation was interrupted
by a signal. In that case, keep retrying the operation, except
if InnoDB shutdown has been initiated.

storage/innobase/fil/fil0fil.cc

@@ -5023,7 +5023,12 @@ fil_extend_space_to_desired_size(
 			= size_after_extend - start_page_no;
 		const os_offset_t	len = os_offset_t(n_pages) * page_size;
 
-		int err = posix_fallocate(node->handle, start_offset, len);
+		int err;
+		do {
+			err = posix_fallocate(node->handle, start_offset, len);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
+
 		success = !err;
 		if (!success) {
 			ib_logf(IB_LOG_LEVEL_ERROR, "extending file %s"

storage/innobase/os/os0file.cc

@@ -2130,7 +2130,12 @@ os_file_set_size(
 
 #ifdef HAVE_POSIX_FALLOCATE
 	if (srv_use_posix_fallocate) {
-		int err = posix_fallocate(file, 0, size);
+		int err;
+		do {
+			err = posix_fallocate(file, 0, size);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
+
 		if (err) {
 			ib_logf(IB_LOG_LEVEL_ERROR,
 				"preallocating " INT64PF " bytes for"

storage/xtradb/fil/fil0fil.cc

@@ -5063,7 +5063,12 @@ fil_extend_space_to_desired_size(
 			= size_after_extend - start_page_no;
 		const os_offset_t	len = os_offset_t(n_pages) * page_size;
 
-		int err = posix_fallocate(node->handle, start_offset, len);
+		int err;
+		do {
+			err = posix_fallocate(node->handle, start_offset, len);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
+
 		success = !err;
 		if (!success) {
 			ib_logf(IB_LOG_LEVEL_ERROR, "extending file %s"

storage/xtradb/os/os0file.cc

@@ -2348,7 +2348,12 @@ os_file_set_size(
 
 #ifdef HAVE_POSIX_FALLOCATE
 	if (srv_use_posix_fallocate) {
-		int err = posix_fallocate(file, 0, size);
+		int err;
+		do {
+			err = posix_fallocate(file, 0, size);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
+
 		if (err) {
 			ib_logf(IB_LOG_LEVEL_ERROR,
 				"preallocating " INT64PF " bytes for"