linux-kernel - Re: [PATCH 4/5] ide: Add support for TRIM

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Message-ID: <20090402165117.GQ2661@linux.intel.com>
Date:	Thu, 2 Apr 2009 09:51:17 -0700
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	jgarzik@...hat.com, David Woodhouse <David.Woodhouse@...el.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: [PATCH 4/5] ide: Add support for TRIM

On Thu, Apr 02, 2009 at 08:38:03PM +0400, Sergei Shtylyov wrote:
> Hello.
>>>> +	task->tf_flags   = IDE_TFLAG_LBA48 | IDE_TFLAG_OUT_HOB |
>>>> +			   IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
>
>>>   The last 3 flags are going to be obsoleted too...
>
>> So if I remove them today, the command will still work?
>
>     s/obsoleted/renamed and moved to another other field/ -- I'm going to 
> submit a patchset refactoring 'struct ide_cmd and 'struct ide-taskfile' 
> at last...

Since I'm coding to today's kernel, not to a patch which doesn't exist
yet, taking them out won't work very well.

I've not been paying much attention to drivers/ide, so I've no idea
whether the following patch works.  It does at least compile:

+++ b/drivers/ide/ide-disk.c
@@ -407,7 +407,7 @@ static void idedisk_prepare_flush(struct request_queue *q, s
 static int idedisk_prepare_discard(struct request_queue *q, struct request *rq,
                                                        struct bio *bio)
 {
-       ide_task_t *task;
+       struct ide_cmd *task;
        unsigned size;
        struct page *page = alloc_page(GFP_KERNEL);
        if (!page)
@@ -432,8 +432,8 @@ static int idedisk_prepare_discard(struct request_queue *q, 
 
        task->tf_flags   = IDE_TFLAG_LBA48 | IDE_TFLAG_OUT_HOB |
                           IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
-                          IDE_TFLAG_DYN;
-       task->data_phase = TASKFILE_OUT_DMA;
+                          IDE_TFLAG_DYN | IDE_TFLAG_WRITE;
+       task->protocol = ATA_PROT_DMA;
 
        rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
        rq->special = task;

If I've understood 0dfb991c6943c810175376b58d1c29cfe532541b correctly,
this should be equivalent.  Bart?
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