On Thu, Mar 20, 2014 at 02:57:28PM +0400, Andrey Vagin wrote:
> Currently we don't have a way how to determing from which mount point
> file has been opened. This information is required for proper dumping
> and restoring file descriptos due to presence of mount namespaces. It's
> possible, that two file descriptors are opened using the same paths, but
> one fd references mount point from one namespace while the other fd --
> from other namespace.
>
> $ ls -l /proc/1/fd/1
> lrwx------ 1 root root 64 Mar 19 23:54 /proc/1/fd/1 -> /dev/null
>
> $ cat /proc/1/fdinfo/1
> pos: 0
> flags: 0100002
> mnt_id: 16
>
> $ cat /proc/1/mountinfo | grep ^16
> 16 32 0:4 / /dev rw,nosuid shared:2 - devtmpfs devtmpfs
> rw,size=1013356k,nr_inodes=253339,mode=755
>
> v2: update Documentation/filesystems/proc.txt
>
> Cc: Al Viro <[email protected]>
> Cc: Oleg Nesterov <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: Cyrill Gorcunov <[email protected]>
> Cc: Rob Landley <[email protected]>
> Acked-by: Pavel Emelyanov <[email protected]>
> Signed-off-by: Andrey Vagin <[email protected]>
Acked-by: Cyrill Gorcunov <[email protected]>
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