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criu: Don't fail if ghost file has no parent dirs.

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Due to way CRIU handles paths (as relative to workdir), there's a case,
where migration would fail. Simple example is a ghost file in filesystem
root (with root being cwd). For example, "/unlinked" becomes "unlinked".
And original code piece scans path for other slashes, which would be
missing in this case. But it's still a perfectly valid case, and there's
no need to fail. So if there's no parent dir - we just don't need to
create one and we can just return 0 here instead of failing.

Signed-off-by: Vitaly Ostrosablin <vostrosablin@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Vitaly Ostrosablin 2017-12-12 16:12:45 +03:00 • committed by Andrei Vagin
parent c767b11c54
commit 6ccd871ba6
1 changed files with 2 additions and 4 deletions
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6
criu/files-reg.c
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@ -1513,10 +1513,8 @@ static int make_parent_dirs_if_need(int mntns_root, char *path)
struct stat st;
p = last_delim = strrchr(path, '/');
if (!p) {
pr_err("Path %s has no parent dir\n", path);
return -1;
}
if (!p)
return 0;
*p = '\0';
if (fstatat(mntns_root, path, &st, AT_EMPTY_PATH) == 0)