Mark Lord wrote:
Matthew Wilcox wrote:
From: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
[modified to reduce amount of special casing needed for discard]
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
---
..
+ task->tf.command = ATA_CMD_DSM;
+ task->tf.feature = ATA_DSM_TRIM;
+ task->tf.hob_feature = 0x00;
+ task->tf.nsect = size / 512;
+ task->tf.hob_nsect = (size / 512) >> 8;
..
Matthew (or others),
Could you perhaps explain what the purpose of the data portion
of this command is for? The draft ATA spec I have here has mangled
text in the description -- like it's missing a crucial sentence there.
So it's not obvious exactly why this command even needs data to
be transfered.
It's a list of LBA ranges, like the NV-cache stuff recently added.
Jeff
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