[CRIU] [PATCH 25/28] files: Add fake fle flag and close such fles after restore files

[Kirill Tkhai]

Allow to mark some fles as "fake" and close them, when they are not needed.

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 criu/files.c         |   14 ++++++++++++++
 criu/include/files.h |    1 +
 2 files changed, 15 insertions(+)

diff --git a/criu/files.c b/criu/files.c
index a2b57ca01..f97b7a0a2 100644
--- a/criu/files.c
+++ b/criu/files.c
@@ -710,6 +710,7 @@ static struct fdinfo_list_entry *alloc_fle(int pid, FdinfoEntry *fe)
 	fle->pid = pid;
 	fle->fe = fe;
 	fle->received = 0;
+	fle->fake = 0;
 	fle->stage = FLE_INITIALIZED;
 	fle->task = pstree_item_by_virt(pid);
 	if (!fle->task) {
@@ -1199,6 +1200,17 @@ static int open_fdinfos(struct pstree_item *me)
 	return ret;
 }
 
+static void close_fake_fdinfos(struct pstree_item *me)
+{
+	struct list_head *list = &rsti(me)->fds;
+	struct fdinfo_list_entry *fle;
+
+	list_for_each_entry(fle, list, ps_list) {
+		if (fle->fake)
+			close(fle->fe->fd);
+	}
+}
+
 static struct inherit_fd *inherit_fd_lookup_fd(int fd, const char *caller);
 
 int close_old_fds(void)
@@ -1268,6 +1280,8 @@ int prepare_fds(struct pstree_item *me)
 	BUG_ON(current->pid->state == TASK_HELPER);
 	ret = open_fdinfos(me);
 
+	close_fake_fdinfos(me);
+
 	if (rsti(me)->fdt)
 		futex_inc_and_wake(&rsti(me)->fdt->fdt_lock);
 out:
diff --git a/criu/include/files.h b/criu/include/files.h
index fd2d20761..fb47eb879 100644
--- a/criu/include/files.h
+++ b/criu/include/files.h
@@ -80,6 +80,7 @@ struct fdinfo_list_entry {
 	FdinfoEntry		*fe;
 	u8			received:1;
 	u8			stage:3;
+	u8			fake:1;
 };
 
 /* reports whether fd_a takes prio over fd_b */