Re: [PATCH 6/6] vfs: introduce FMODE_NEG_OFFSET for allowingnegative f_pos

From: KAMEZAWA Hiroyuki
Date: Sun Jan 17 2010 - 21:03:48 EST

On Mon, 18 Jan 2010 10:38:27 +0900
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> wrote:

> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> writes:
> >> So, lseek() returns (uses) it?
> >
> > lseek can return negative value, as far as I know.
> Umm..., how do you know the difference of -EOVERFLOW and fpos == -75?

Ah, sorry. I read wrong.

For /dev/mem, it uses its own lseek function which allows negative f_pos
value. Other usual file system doesn't allow negative f_pos.

It's ok not to return -EOVEFLOW for /dev/mem because there is no file end.


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