/*
* 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;
}
/*
* 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;
}
