On 03/31, Konstantin Khlebnikov wrote:
>
> comment from v2.6.25-6245-g925d1c4 ("procfs task exe symlink"),
> where all this stuff was introduced:
>
> > ...
> > This avoids pinning the mounted filesystem.
>
> So, this logic is hooked into every file mmap/unmmap and vma split/merge just to
> fix some hypothetical pinning fs from umounting by mm which already unmapped all
> its executable files, but still alive. Does anyone know any real world example?
This is the question to Matt.
> keep mm->exe_file alive till final mmput().
Please see the recent discussion, http://marc.info/?t=133096188900012
(just in case, the patch itself was deadly wrong, don't look at it ;)
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -378,7 +378,6 @@ struct mm_struct {
>
> /* store ref to file /proc/<pid>/exe symlink points to */
> struct file *exe_file;
> - unsigned long num_exe_file_vmas;
Add Cyrill. This conflicts with
c-r-prctl-add-ability-to-set-new-mm_struct-exe_file.patch in -mm.
Oleg.
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