[RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2

Zan Lynx zlynx at acm.org
Wed Aug 24 08:05:21 PDT 2011

On 8/24/2011 2:53 AM, Cyrill Gorcunov wrote:
> From: Pavel Emelyanov <xemul at parallels.com>
> This one behaves similarly to the /proc/<pid>/fd/ one - it contains symlinks
> one for each mapping with file, the name of a symlink is vma->vm_start, the
> target is the file. Opening a symlink results in a file that point exactly
> to the same inode as them vma's one.
> This thing is aimed to help checkpointing processes.
> For example the ls -l of some arbitrary /proc/<pid>/map_files/
>  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73a00000 -> /lib64/ld-2.5.so

Just curious: How do these symlinks work when the process reading a
/proc file is in a chroot or a different namespace?

For example, a chroot environment might have independent copies of
/lib64/ld-2.5.so and a bind mount of /proc. Does the symlink then point
to the wrong file?

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