[CRIU] [PATCH v3 15/26] files: Add fdinfo_list_entry::stage

[Kirill Tkhai]

Add fle open stages. Set a stage after every operation.

v2: Do not merge filetype specific state with generic.

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 criu/files.c         |   13 ++++++++++---
 criu/include/files.h |    9 +++++++++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/criu/files.c b/criu/files.c
index 69a43c6..73c23b4 100644
--- a/criu/files.c
+++ b/criu/files.c
@@ -976,12 +976,16 @@ static int post_open_fd(int pid, struct fdinfo_list_entry *fle)
 			return -1;
 		}
 		if (!is_service_fd(fle->fe->fd, CTL_TTY_OFF))
-			return 0;
+			goto out;
 	}
 
 	if (!d->ops->post_open)
-		return 0;
-	return d->ops->post_open(d, fle->fe->fd);
+		goto out;
+	if (d->ops->post_open(d, fle->fe->fd))
+		return -1;
+out:
+	fle->stage = FLE_RESTORED;
+	return 0;
 }
 
 
@@ -1029,6 +1033,9 @@ static int open_fd(int pid, struct fdinfo_list_entry *fle)
 		return -1;
 	}
 
+	if (fle->stage < FLE_OPEN)
+		fle->stage = FLE_OPEN;
+
 	return serve_out_fd(pid, fle->fe->fd, d);
 }
 
diff --git a/criu/include/files.h b/criu/include/files.h
index 7fdb3cf..9fec16a 100644
--- a/criu/include/files.h
+++ b/criu/include/files.h
@@ -64,6 +64,13 @@ extern int fill_fdlink(int lfd, const struct fd_parms *p, struct fd_link *link);
 
 struct file_desc;
 
+enum {
+	FLE_INITIALIZED,
+	FLE_OPEN,
+	FLE_RESTORING,
+	FLE_RESTORED,
+};
+
 struct fdinfo_list_entry {
 	struct list_head	desc_list;	/* To chain on  @fd_info_head */
 	struct file_desc	*desc;		/* Associated file descriptor */
@@ -72,6 +79,7 @@ struct fdinfo_list_entry {
 	int			pid;
 	FdinfoEntry		*fe;
 	u8			received:1;
+	u8			stage:3;
 };
 
 static inline void fle_init(struct fdinfo_list_entry *fle, int pid, FdinfoEntry *fe)
@@ -79,6 +87,7 @@ static inline void fle_init(struct fdinfo_list_entry *fle, int pid, FdinfoEntry
 	fle->pid = pid;
 	fle->fe = fe;
 	fle->received = 0;
+	fle->stage = FLE_INITIALIZED;
 }
 
 /* reports whether fd_a takes prio over fd_b */