On Mon, Oct 5, 2020 at 9:40 PM Alexander Mikhalitsyn
wrote:
> Oh, yes, it's just another one choice for us ;)
> I decided to create ioctl which opens fd for transferring
> data about overlayfs.
> Sure, let's look on sys fs. I will dive into it!
Or maybe use fsinfo(2) or whatever it's going to be
On Mon, 5 Oct 2020 20:22:47 +0300
Amir Goldstein wrote:
> On Mon, Oct 5, 2020 at 8:13 PM Alexander Mikhalitsyn
> wrote:
> >
> > On Mon, 5 Oct 2020 10:08:42 -0700
> > Randy Dunlap wrote:
> >
> > > On 10/5/20 10:02 AM, Alexander Mikhalitsyn wrote:
> > > > #defineOVL_IOC_GETLWRFHNDLSNUM
On Mon, Oct 5, 2020 at 8:13 PM Alexander Mikhalitsyn
wrote:
>
> On Mon, 5 Oct 2020 10:08:42 -0700
> Randy Dunlap wrote:
>
> > On 10/5/20 10:02 AM, Alexander Mikhalitsyn wrote:
> > > #defineOVL_IOC_GETLWRFHNDLSNUM _IO('o', 1)
> > > // DISCUSS: what if MAX_HANDLE_SZ will chang
On Mon, 5 Oct 2020 10:08:42 -0700
Randy Dunlap wrote:
> On 10/5/20 10:02 AM, Alexander Mikhalitsyn wrote:
> > #defineOVL_IOC_GETLWRFHNDLSNUM _IO('o', 1)
> > // DISCUSS: what if MAX_HANDLE_SZ will change?
> > #defineOVL_IOC_GETLWRFHNDL _IOR('o', 2, st
On 10/5/20 10:02 AM, Alexander Mikhalitsyn wrote:
> #define OVL_IOC_GETLWRFHNDLSNUM _IO('o', 1)
> // DISCUSS: what if MAX_HANDLE_SZ will change?
> #define OVL_IOC_GETLWRFHNDL _IOR('o', 2, struct
> ovl_mnt_opt_fh)
> #define OVL_IOC_GETUPPRFHNDL
Second variant of possible interface to get source-dirs fhandles from
userspace. OVL_IOC_GETINFOFD ioctls opens special [ovlinfofd] descriptor
which is really just seq_file. When read from this seq_file we will get
something like this:
===
numlower: 2
L fhandle-bytes:c fhandle-type:1 f_handle:9685a
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