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mount: clone a mount namespace to open a detached mount

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If we can't create a temporary directory for a detached mount,
we can clone a whole mount namespace, open a mount and release
the created namespace. The result will be the same.

https://jira.sw.ru/browse/PSBM-57135
https://github.com/opencontainers/runc/issues/1202
travis-ci: success for A few fixes to c/r a docker container with a console (rev3)
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Andrei Vagin
2017-02-07 11:43:30 +03:00
parent 3cedb6183a
commit f830e0ff34
1 changed files with 16 additions and 3 deletions
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19
criu/mount.c
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@@ -1091,10 +1091,23 @@ int open_mountpoint(struct mount_info *pm)
goto out;
mnt_path = get_clean_mnt(pm, mnt_path_tmp, mnt_path_root);
if (mnt_path == NULL)
goto out;
if (mnt_path == NULL) {
/*
* We probably can't create a temporary direcotry,
* so we can try to clone the mount namespace, open
* the required mount and destroy this mount namespace
* by calling restore_ns() below in this function.
*/
if (unshare(CLONE_NEWNS)) {
pr_perror("Unable to clone a mount namespace");
goto out;
}
fd = open_detach_mount(mnt_path);
fd = open(pm->mountpoint, O_RDONLY | O_DIRECTORY, 0);
if (fd < 0)
pr_perror("Can't open directory %s: %d", pm->mountpoint, fd);
} else
fd = open_detach_mount(mnt_path);
if (fd < 0)
goto out;