/*
* AUFS support to compensate for the kernel bug
* exposing branch pathnames in map_files.
*
* If the link points inside a branch, save the
* relative pathname from the root of the mount
* namespace as well as the full pathname from
* globl root (/) for later use in dump_filemap()
* and parse_smaps().
*/
int fixup_aufs_vma_fd(struct vma_area *vma)
{
char path[PATH_MAX];
int len;
path[0] = '.';
len = read_fd_link(vma->vm_file_fd, &path[1], sizeof path - 1);
if (len < 0)
return -1;
len = fixup_aufs_path(&path[1], sizeof path - 1);
if (len < 0)
return -1;
if (len > 0) {
vma->aufs_rpath = xmalloc(len + 2);
if (!vma->aufs_rpath)
return -1;
strcpy(vma->aufs_rpath, path);
if (opts.root) {
vma->aufs_fpath = xmalloc(strlen(opts.root) + 1 + len + 1);
if (!vma->aufs_fpath)
return -1;
/* skip ./ in path */
sprintf(vma->aufs_fpath, "%s/%s", opts.root, &path[2]);
}
pr_debug("Saved AUFS paths %s and %s\n", vma->aufs_rpath, vma->aufs_fpath);
}
return 0;
}
static char *image_name(int fd)
{
static char image_path[PATH_MAX];
if (read_fd_link(fd, image_path, sizeof(image_path)) > 0)
return image_path;
return NULL;
}
int main(int argc, char *argv[])
{
char path_orig[64], path_new[64];
int fd_self, fd_new;
test_init(argc, argv);
memset(path_orig, 0, sizeof(path_orig));
memset(path_new, 0, sizeof(path_new));
fd_self = open(nspath, O_RDONLY);
if (fd_self < 0) {
err("Can't open %s", nspath);
return -1;
}
test_daemon();
test_waitsig();
if (read_fd_link(fd_self, path_orig, sizeof(path_orig))) {
err("Can't fill original path");
return -1;
}
fd_new = open(nspath, O_RDONLY);
if (fd_new < 0) {
err("Can't open %s", nspath);
return -1;
}
if (read_fd_link(fd_new, path_new, sizeof(path_new))) {
err("Can't fill new path");
return -1;
}
if (memcmp(path_orig, path_new, sizeof(path_orig))) {
fail("Paths mismatch %s %s\n", path_orig, path_new);
return -1;
}
pass();
return 0;
}
/*
* AUFS support to compensate for the kernel bug
* exposing branch pathnames in map_files and providing
* a wrong mnt_id value in /proc/<pid>/fdinfo/<fd>.
*
* If the link points inside a branch, save the
* relative pathname from the root of the mount
* namespace as well as the full pathname from
* globl root (/) for later use in dump_filemap()
* and parse_smaps().
*/
int fixup_aufs_vma_fd(struct vma_area *vma)
{
char path[PATH_MAX];
int len;
path[0] = '.';
len = read_fd_link(vma->vm_file_fd, &path[1], sizeof path - 1);
if (len < 0)
return -1;
len = fixup_aufs_path(&path[1], sizeof path - 1);
if (len <= 0)
return len;
vma->aufs_rpath = xmalloc(len + 2);
if (!vma->aufs_rpath)
return -1;
strcpy(vma->aufs_rpath, path);
if (opts.root) {
/* skip ./ in path */
vma->aufs_fpath = xsprintf("%s/%s", opts.root, &path[2]);
if (!vma->aufs_fpath)
return -1;
}
pr_debug("Saved AUFS paths %s and %s\n", vma->aufs_rpath, vma->aufs_fpath);
if (stat(vma->aufs_fpath, vma->vmst) < 0) {
pr_perror("Failed stat on map %"PRIx64" (%s)",
vma->e->start, vma->aufs_fpath);
return -1;
}
/* tell parse_smap() not to call get_fd_mntid() */
vma->mnt_id = -1;
return len;
}
