lkml.org 
[lkml]   [2009]   [Jun]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 06/14] Pramfs: Include files
Date
On Saturday 13 June 2009, Sam Ravnborg wrote:
> > + union {
> > + struct {
> > + /*
> > + * ptr to row block of 2D block pointer array,
> > + * file block #'s 0 to (blocksize/4)^2 - 1.
> > + */
> > + off_t row_block;
>
> It is my understanding that we shall use: __kernel_off_t
> in exported headers.

That is a correct understanding in general, however this case is
different, because it describes an on-disk data structure,
not a kernel to user space interface. Here, __kernel_off_t is just
as wrong as off_t, because it will differ between 32 and 64 bit
architectures, making the fs layout incompatible. I'd suggest
simply defining this as __u64.

Moreover, file system layout should be described in terms of
big-endian or little-endian types (e.g. __be64 or __le64),
together with the right accessor functions.

Arnd <><


\
 
 \ /
  Last update: 2009-06-14 01:03    [W:0.482 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site