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mntns: crtools: stat pathes relatively of a mntns root

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If we dump tasks with mntns, we should look at pathes from point of a mntns root.

Now we support a situation when a root of an init task has the same root as the
mntns root, because we have not another way to get a root of mntns.

A path to an unix socket is copied, because the origin copy will be gone
out from the function, where it was created.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-08-01 07:00:48 +04:00
committed by Pavel Emelyanov
parent 3a60163b71
commit c69be631e1
5 changed files with 54 additions and 8 deletions
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35
mount.c
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@@ -22,6 +22,7 @@
#include "protobuf/mnt.pb-c.h"
static struct mount_info *mntinfo;
int mntns_root = -1;
int open_mount(unsigned int s_dev)
{
@@ -499,3 +500,37 @@ void show_mountpoints(int fd, struct cr_options *o)
{
pb_show_plain(fd, mnt_entry);
}
int mntns_collect_root(pid_t pid)
{
int fd, pfd;
int ret;
char path[PATH_MAX + 1];
/* If /proc/pid/root links on '/', it signs that a root of the task
* and a root of mntns is the same. */
pfd = open_pid_proc(pid);
ret = readlinkat(pfd, "root", path, PATH_MAX);
if (ret < 0)
return ret;
path[ret + 1] = '\0';
if (ret != 1 || path[0] != '/') {
pr_err("The root task has another root than mntns: %s\n", path);
close_pid_proc();
return -1;
}
fd = openat(pfd, "root", O_RDONLY | O_DIRECTORY, 0);
close_pid_proc();
if (fd < 0) {
pr_perror("Can't open the task root");
return -1;
}
mntns_root = fd;
return 0;
}