чт, 25 июл. 2019 г. в 09:57, Sebastien Tisserant via samba-technical
<samba-technical@xxxxxxxxxxxxxxx>:
...
>
> mount works without CONFIG_DEBUG_VIRTUAL
>
> If we don't set CONFIG_VMAP_STACK mount works with CONFIG_DEBUG_VIRTUAL
>
>
> We have the following (very quick and dirty) patch :
>
> Index: linux-4.19.60/fs/cifs/smb2ops.c
> ===================================================================
> --- linux-4.19.60.orig/fs/cifs/smb2ops.c
> +++ linux-4.19.60/fs/cifs/smb2ops.c
> @@ -2545,7 +2545,15 @@ fill_transform_hdr(struct smb2_transform
> static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
> unsigned int buflen)
> {
> - sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
> + void *addr;
> + /*
> + * VMAP_STACK (at least) puts stack into the vmalloc address space
> + */
> + if (is_vmalloc_addr(buf))
> + addr = vmalloc_to_page(buf);
> + else
> + addr = virt_to_page(buf);
> + sg_set_page(sg, addr, buflen, offset_in_page(buf));
> }
>
> /* Assumes the first rqst has a transform header as the first iov.
>
>
Thanks for reporting this. The patch looks good to me. Did you test
your scenario all together with it (not only mounting)?
Best regards,
Pavel Shilovskiy
