[CRIU] [PATCH 05/16] files: save mnt_id on fd_param

[Andrey Vagin]

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 cr-dump.c       | 29 +++++++++++++++++++++++++++--
 files.c         |  1 +
 include/files.h |  2 ++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/cr-dump.c b/cr-dump.c
index 23bd13a..85246f2 100644
--- a/cr-dump.c
+++ b/cr-dump.c
@@ -240,6 +240,17 @@ static int collect_fds(pid_t pid, struct parasite_drain_fd *dfds)
 	return 0;
 }
 
+static int get_fd_mntid(int fd, int *mnt_id)
+{
+	struct fdinfo_common fdinfo = { .mnt_id = -1};
+
+	if (parse_fdinfo(fd, FD_TYPES__UND, NULL, &fdinfo))
+		return -1;
+
+	*mnt_id = fdinfo.mnt_id;
+	return 0;
+}
+
 static int dump_task_exe_link(pid_t pid, MmEntry *mm)
 {
 	struct fd_parms params = FD_PARMS_INIT;
@@ -254,8 +265,12 @@ static int dump_task_exe_link(pid_t pid, MmEntry *mm)
 		return -1;
 	}
 
-	if (fd_id_generate_special(&params.stat, &mm->exe_file_id))
+	if (get_fd_mntid(fd, &params.mnt_id))
+		return -1;
+
+	if (fd_id_generate_special(&params.stat, &mm->exe_file_id)) {
 		ret = dump_one_reg_file(fd, mm->exe_file_id, &params);
+	}
 
 	close(fd);
 	return ret;
@@ -279,6 +294,9 @@ static int dump_task_fs(pid_t pid, struct parasite_dump_misc *misc, struct cr_fd
 		return -1;
 	}
 
+	if (get_fd_mntid(fd, &p.mnt_id))
+		return -1;
+
 	if (fd_id_generate_special(&p.stat, &fe.cwd_id)) {
 		ret = dump_one_reg_file(fd, fe.cwd_id, &p);
 		if (ret < 0)
@@ -297,6 +315,9 @@ static int dump_task_fs(pid_t pid, struct parasite_dump_misc *misc, struct cr_fd
 		return -1;
 	}
 
+	if (get_fd_mntid(fd, &p.mnt_id))
+		return -1;
+
 	if (fd_id_generate_special(&p.stat, &fe.root_id)) {
 		ret = dump_one_reg_file(fd, fe.root_id, &p);
 		if (ret < 0)
@@ -346,10 +367,14 @@ static int dump_filemap(pid_t pid, struct vma_area *vma_area,
 	BUG_ON(!vma_area->st);
 	p.stat = *vma_area->st;
 
+	if (get_fd_mntid(vma_area->vm_file_fd, &p.mnt_id))
+		return -1;
+
 	/* Flags will be set during restore in get_filemap_fd() */
 
-	if (fd_id_generate_special(&p.stat, &id))
+	if (fd_id_generate_special(&p.stat, &id)) {
 		ret = dump_one_reg_file(vma_area->vm_file_fd, id, &p);
+	}
 
 	vma->shmid = id;
 	return ret;
diff --git a/files.c b/files.c
index e2ebeb6..cfbbb4b 100644
--- a/files.c
+++ b/files.c
@@ -225,6 +225,7 @@ static int fill_fd_params(struct parasite_ctl *ctl, int fd, int lfd,
 	p->fd		= fd;
 	p->pos		= fdinfo.pos;
 	p->flags	= fdinfo.flags;
+	p->mnt_id	= fdinfo.mnt_id;
 	p->pid		= ctl->pid.real;
 	p->fd_flags	= opts->flags;
 
diff --git a/include/files.h b/include/files.h
index cfa40ac..a18d56e 100644
--- a/include/files.h
+++ b/include/files.h
@@ -46,6 +46,7 @@ struct fd_parms {
 	FownEntry	fown;
 	struct fd_link	*link;
 	long		fs_type;
+	int		mnt_id;
 
 	struct parasite_ctl *ctl;
 };
@@ -55,6 +56,7 @@ struct fd_parms {
 	.fd	= FD_DESC_INVALID,	\
 	.fown	= FOWN_ENTRY__INIT,	\
 	.link	= NULL,			\
+	.mnt_id = -1,			\
 }
 
 extern int fill_fdlink(int lfd, const struct fd_parms *p, struct fd_link *link);
-- 
1.8.5.3