On Thu, Jan 03 2008 at 9:00 +0200, Rusty Russell [EMAIL PROTECTED] wrote:
OK, after wading through many scsi drivers, I decided to change tack and try
to provide a transition path. This is in two stages:
1) These two patches. sg_ring used underneath, but if any driver asks for
scsi_sglist() they get a 2.6.24-style chained sg. No other patches are
necessary.
2) Once all chained-sg-needing scsi drivers change to use cmd-sg (ie.
sg_ring) directly, and the chained sg patches can be reverted. scsi_sglist()
and scsi_sg_count() then become:
/* You should only use these if you never need chained sgs */
static inline struct scatterlist *scsi_sglist(struct scsi_cmd *cmd)
{
BUG_ON(!list_empty(cmd-sg-list));
return cmd-sg-sg[0];
}
static unsigned int scsi_sg_count(struct scsi_cmd *cmd)
{
if (!cmd-sg)
return 0;
BUG_ON(!list_empty(cmd-sg-list));
return cmd-sg-num;
}
Thanks,
Rusty.
Look in the mailing list archives for the scsi_sgtable patches.
These did exactly what you do here. (OK 95% ;))
(only as a scsi subsystem not as a generic sg)
Boaz
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