From 48c6f11d0b3c5f0549ff52cce0c8ce31ad67518f Mon Sep 17 00:00:00 2001
From: Jingxian He <hejingxian@huawei.com>
Date: Wed, 19 May 2021 21:49:15 +0800
Subject: [PATCH 23/72] block-device: dump block device as reguler file

Add block device dump and restore method for kernel module upgrading.

Conflict:NA
Reference:https://gitee.com/src-openeuler/criu/pulls/21
Signed-off-by: Xiaoguang Li <lixiaoguang2@huawei.com>
---
 criu/files.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/criu/files.c b/criu/files.c
index 93754fb..f262d80 100644
--- a/criu/files.c
+++ b/criu/files.c
@@ -442,6 +442,30 @@ static const struct fdtype_ops *get_mem_dev_ops(struct fd_parms *p, int minor)
 	return ops;
 }
 
+static int dump_blkdev(struct fd_parms *p, int lfd, FdinfoEntry *e)
+{
+	struct fd_link *link_old = p->link;
+	int maj = major(p->stat.st_rdev);
+	const struct fdtype_ops *ops;
+	int err;
+
+	switch (maj) {
+	case SCSI_DISK0_MAJOR:
+		ops = &regfile_dump_ops;
+		break;
+	default: {
+		char more[32] = "block_dev";
+
+		err = dump_unsupp_fd(p, lfd, "blk", more, e);
+		p->link = link_old;
+		return err;
+	}
+	}
+	err = do_dump_gen_file(p, lfd, ops, e);
+	p->link = link_old;
+	return err;
+}
+
 static int dump_chrdev(struct fd_parms *p, int lfd, FdinfoEntry *e)
 {
 	struct fd_link *link_old = p->link;
@@ -508,6 +532,9 @@ 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_ISBLK(p.stat.st_mode))
+		return dump_blkdev(&p, lfd, e);
+
 	if (S_ISSOCK(p.stat.st_mode))
 		return dump_socket(&p, lfd, e);
 
-- 
2.34.1