Re: [PATCH v13 03/12] splice: Do splice read from a buffered file without using ITER_PIPE

[Guenter Roeck]

On 2/13/23 14:43, David Howells wrote:
> Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>
> > [    4.660118] PC is at 0x0
> > [    4.660248] LR is at filemap_read_folio+0x17/0x4e
>
> Do you know what the filesystem is that's being read from?
>
> I think the problem is that there are a few filesystems/drivers that call
> generic_file_splice_read() but don't have a ->read_folio().  Now most of these
> can be made to call direct_splice_read() instead, leaving just coda, overlayfs
> and shmem.
>
> Coda and overlayfs can be made to pass the request down a layer.  I'm about to
> look into shmem.

Both are initrd.

Guenter