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

From: OGAWA Hirofumi
Date: Sun Jan 17 2010 - 20:32:59 EST

OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> writes:

>>> Um... How do lseek() work? It sounds like to violate error code range.
>> This is for read-write. As far as I know,
>> - generic_file_llseek,
>> - default_llseek
>> - no_llseek
>> doesn't call this function.
> It seems to allow to set negative value to ->f_pos, right? So, lseek()
> returns (uses) it?

BTW, another concern by negative "pos" value is, the following like code

pos >> shift_bits

it will break the above. So, I think it should be checked if not yet.
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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