epoll: Pass drained fds to dump_one_file

In epoll dumping we will need the whole set of fds to investigate
the targets, so pass this parameter down to epoll code.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/files.c

@@ -475,7 +475,8 @@ static int dump_chrdev(struct fd_parms *p, int lfd, FdinfoEntry *e)
 }
 
 static int dump_one_file(struct pid *pid, int fd, int lfd, struct fd_opts *opts,
-		struct parasite_ctl *ctl, FdinfoEntry *e)
+		struct parasite_ctl *ctl, FdinfoEntry *e,
+		struct parasite_drain_fd *dfds)
 {
 	struct fd_parms p = FD_PARMS_INIT;
 	const struct fdtype_ops *ops;
@@ -498,6 +499,7 @@ static int dump_one_file(struct pid *pid, int fd, int lfd, struct fd_opts *opts,
 	}
 
 	p.fd_ctl = ctl; /* Some dump_opts require this to talk to parasite */
+	p.dfds = dfds; /* epoll needs to verify if target fd exist */
 
 	if (S_ISSOCK(p.stat.st_mode))
 		return dump_socket(&p, lfd, e);
@@ -572,7 +574,7 @@ int dump_my_file(int lfd, u32 *id, int *type)
 	me.real = getpid();
 	me.ns[0].virt = -1; /* FIXME */
 
-	if (dump_one_file(&me, lfd, lfd, &fo, NULL, &e))
+	if (dump_one_file(&me, lfd, lfd, &fo, NULL, &e, NULL))
 		return -1;
 
 	*id = e.id;
@@ -619,7 +621,7 @@ int dump_task_files_seized(struct parasite_ctl *ctl, struct pstree_item *item,
 			FdinfoEntry e = FDINFO_ENTRY__INIT;
 
 			ret = dump_one_file(item->pid, dfds->fds[i + off],
-						lfds[i], opts + i, ctl, &e);
+						lfds[i], opts + i, ctl, &e, dfds);
 			if (ret)
 				break;
 

criu/include/files.h

@@ -15,6 +15,7 @@
 #include "images/fown.pb-c.h"
 #include "images/vma.pb-c.h"
 
+struct parasite_drain_fd;
 struct pstree_item;
 struct file_desc;
 struct cr_imgset;
@@ -50,6 +51,7 @@ struct fd_parms {
 	int		mnt_id;
 
 	struct parasite_ctl *fd_ctl;
+	struct parasite_drain_fd *dfds;
 };
 
 #define FD_PARMS_INIT			\