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.c

@@ -4140,7 +4140,11 @@ fil_extend_space_to_desired_size(
 			= (start_page_no - file_start_page_no) * page_size;
 		ib_int64_t	len
 			= (size_after_extend - start_page_no) * 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;
 

storage/innobase/os/os0file.c

@@ -2032,7 +2032,11 @@ os_file_set_size(
 
 #ifdef HAVE_POSIX_FALLOCATE
 	if (srv_use_posix_fallocate) {
-		int err = posix_fallocate(file, 0, desired_size);
+		int err;
+		do {
+			err = posix_fallocate(file, 0, desired_size);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
 		if (err) {
 			fprintf(stderr,
 				"InnoDB: Error: preallocating %lld bytes for"

storage/xtradb/fil/fil0fil.c

@@ -4975,7 +4975,11 @@ fil_extend_space_to_desired_size(
 			= (start_page_no - file_start_page_no) * page_size;
 		ib_int64_t	len
 			= (size_after_extend - start_page_no) * 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;
 

storage/xtradb/os/os0file.c

@@ -2189,7 +2189,11 @@ os_file_set_size(
 
 #ifdef HAVE_POSIX_FALLOCATE
 	if (srv_use_posix_fallocate) {
-		int err = posix_fallocate(file, 0, desired_size);
+		int err;
+		do {
+			err = posix_fallocate(file, 0, desired_size);
+		} while (err == EINTR
+			 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
 		if (err) {
 			fprintf(stderr,
 				"InnoDB: Error: preallocating %lld bytes for"