parasite: Arguments sanitation

Remove typedefs and make the common part of sigacts and pages dumping arguments
for dumping something into a specific file. Will be used almost as-is soon.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

include/parasite.h

@@ -56,22 +56,20 @@ typedef struct  {
 		st->line	= __LINE__;		\
 	} while (0)
 
-typedef struct {
+struct parasite_dump_file_args {
 	parasite_status_t	status;
-	struct vma_entry	vma_entry;
-	unsigned long		nrpages_dumped;	/* how many pages are dumped */
-	unsigned long		fd;
 	unsigned long		open_mode;
 	unsigned long		open_flags;
 	char			open_path[PATH_MAX];
-} parasite_args_cmd_dumppages_t;
+};
 
-typedef struct {
-	parasite_status_t	status;
-	unsigned long		open_mode;
-	unsigned long		open_flags;
-	char			open_path[PATH_MAX];
-} parasite_args_cmd_dumpsigacts_t;
+struct parasite_dump_pages_args {
+	struct parasite_dump_file_args fa;
+
+	struct vma_entry	vma_entry;
+	unsigned long		nrpages_dumped;	/* how many pages are dumped */
+	unsigned long		fd;
+};
 
 /*
  * Some useful offsets

parasite-syscall.c

@@ -343,8 +343,7 @@ err:
 
 int parasite_dump_sigacts_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset)
 {
-	parasite_args_cmd_dumpsigacts_t parasite_sigacts	= { };
-
+	struct parasite_dump_file_args parasite_sigacts = { };
 	int status, ret = -1;
 
 	pr_info("\n");
@@ -383,9 +382,7 @@ out:
 int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head *vma_area_list,
 			       struct cr_fdset *cr_fdset)
 {
-	parasite_args_cmd_dumppages_t parasite_dumppages	= { };
-	parasite_args_t parasite_arg				= { };
-
+	struct parasite_dump_pages_args parasite_dumppages = { };
 	user_regs_struct_t regs, regs_orig;
 	unsigned long nrpages_dumped = 0;
 	struct vma_area *vma_area;
@@ -396,8 +393,8 @@ int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head *vma_a
 	pr_info("Dumping pages (type: %d pid: %d)\n", CR_FD_PAGES, ctl->pid);
 	pr_info("----------------------------------------\n");
 
-	if (get_image_path(parasite_dumppages.open_path,
-				sizeof(parasite_dumppages.open_path),
+	if (get_image_path(parasite_dumppages.fa.open_path,
+				sizeof(parasite_dumppages.fa.open_path),
 				fdset_template[CR_FD_PAGES].fmt, ctl->pid))
 		goto out;
 
@@ -412,9 +409,9 @@ int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head *vma_a
 	 */
 	fsync(cr_fdset->fds[CR_FD_PAGES]);
 
-	parasite_dumppages.open_flags	= O_WRONLY;
-	parasite_dumppages.open_mode	= CR_FD_PERM_DUMP;
-	parasite_dumppages.fd		= -1UL;
+	parasite_dumppages.fa.open_flags = O_WRONLY;
+	parasite_dumppages.fa.open_mode = CR_FD_PERM_DUMP;
+	parasite_dumppages.fd = -1UL;
 
 
 	list_for_each_entry(vma_area, vma_area_list, list) {
@@ -437,9 +434,9 @@ int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head *vma_a
 					sizeof(parasite_dumppages));
 		if (ret) {
 			pr_panic("Dumping pages failed with %li (%li) at %li\n",
-				 parasite_dumppages.status.ret,
-				 parasite_dumppages.status.sys_ret,
-				 parasite_dumppages.status.line);
+				 parasite_dumppages.fa.status.ret,
+				 parasite_dumppages.fa.status.sys_ret,
+				 parasite_dumppages.fa.status.line);
 
 			goto err_restore;
 		}

parasite.c

@@ -92,9 +92,9 @@ static inline int should_dump_page(struct vma_entry *vmae, unsigned char mincore
  * This is the main page dumping routine, it's executed
  * inside a victim process space.
  */
-static int dump_pages(parasite_args_cmd_dumppages_t *args)
+static int dump_pages(struct parasite_dump_pages_args *args)
 {
-	parasite_status_t *st = &args->status;
+	parasite_status_t *st = &args->fa.status;
 	unsigned long nrpages, pfn, length;
 	unsigned long prot_old, prot_new;
 	unsigned char *map_brk = NULL;
@@ -106,7 +106,7 @@ static int dump_pages(parasite_args_cmd_dumppages_t *args)
 	prot_old = prot_new = 0;
 
 	if (args->fd == -1UL) {
-		args->fd = sys_open(args->open_path, args->open_flags, args->open_mode);
+		args->fd = sys_open(args->fa.open_path, args->fa.open_flags, args->fa.open_mode);
 		if ((long)args->fd < 0) {
 			sys_write_msg("sys_open failed\n");
 			SET_PARASITE_STATUS(st, PARASITE_ERR_OPEN, args->fd);
@@ -223,7 +223,7 @@ err:
 	return ret;
 }
 
-static int dump_sigact(parasite_args_cmd_dumpsigacts_t *args)
+static int dump_sigact(struct parasite_dump_file_args *args)
 {
 	parasite_status_t *st = &args->status;
 	rt_sigaction_t act;
@@ -280,8 +280,8 @@ static int __used parasite_service(unsigned long cmd, void *args, void *brk)
 {
 	brk_init(brk);
 
-	BUILD_BUG_ON(sizeof(parasite_args_cmd_dumppages_t) > PARASITE_ARG_SIZE);
-	BUILD_BUG_ON(sizeof(parasite_args_cmd_dumpsigacts_t) > PARASITE_ARG_SIZE);
+	BUILD_BUG_ON(sizeof(struct parasite_dump_pages_args) > PARASITE_ARG_SIZE);
+	BUILD_BUG_ON(sizeof(struct parasite_dump_file_args) > PARASITE_ARG_SIZE);
 
 	switch (cmd) {
 	case PARASITE_CMD_KILLME:
@@ -290,10 +290,10 @@ static int __used parasite_service(unsigned long cmd, void *args, void *brk)
 	case PARASITE_CMD_PINGME:
 		break;
 	case PARASITE_CMD_DUMPPAGES:
-		return dump_pages((parasite_args_cmd_dumppages_t *)args);
+		return dump_pages((struct parasite_dump_pages_args *)args);
 		break;
 	case PARASITE_CMD_DUMP_SIGACTS:
-		return dump_sigact((parasite_args_cmd_dumpsigacts_t *)args);
+		return dump_sigact((struct parasite_dump_file_args *)args);
 		break;
 	default:
 		sys_write_msg("Unknown command to parasite\n");