Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> It turns out that for block device files we don't need to change anything.
> The BLKSECTGET ioctl already does almost exactly what we want:
>
> int n;
>
> if (ioctl(fd, BLKSECTGET, &n) == 0)
> max_transfer_size = n * 512;
>
> So only the legacy sg character-device files need attention, which means
> that only the part of the patch affecting sg.c is necessary. The new
> SG_GET_MAX_TRANSFER_LENGTH ioctl can remain unimplemented by the block
> layer -- just as SG_[SG]ET_RESERVED_SIZE should be.
>
> How does that sound?
libscg needs a unique ioctl that works for all used filedescriptors that
may be a target for SG_IO.
Jörg
--
EMail:joerg@xxxxxxxxxxxxxxxxxxxxxxxxxxx (home) Jörg Schilling D-13353 Berlin
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