From: Christoph Hellwig <hch@infradead.org>
To: "Nicholas A. Bellinger" <nab@daterainc.com>
Cc: target-devel <target-devel@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>,
Martin Petersen <martin.petersen@oracle.com>,
Chris Mason <chris.mason@fusionio.com>,
Roland Dreier <roland@purestorage.com>,
James Bottomley <JBottomley@Parallels.com>,
Nicholas Bellinger <nab@linux-iscsi.org>
Subject: Re: [PATCH-v2 06/12] target: Add memory allocation for bidirectional commands
Date: Sat, 24 Aug 2013 08:18:17 -0700 [thread overview]
Message-ID: <20130824151817.GA15588@infradead.org> (raw)
In-Reply-To: <1377147250-10125-7-git-send-email-nab@daterainc.com>
> static int
> +transport_generic_get_mem_bidi(struct se_cmd *cmd)
Except for the fields touched in struct se_cmd this is a duplication
of transport_generic_get_mem. I'd suggest to factor that one into
a new helper:
static int
target_alloc_sgl(struct scatterlist **sgl, unsigned int **nents,
u32 length, gfp_t gfp_mask)
{
..
}
and then call that one from transport_generic_new_cmd directly,
including opencoding the actual BIDI case there as a first step.
If we go down your proposed route for COMPARE and WRITE we'd also
allocate that buffer there, although I think there is a more elegant
way to do that, but more on that later.
next prev parent reply other threads:[~2013-08-24 15:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-22 4:53 [PATCH-v2 00/12] target: Add support for COMPARE_AND_WRITE (VAAI) emulation Nicholas A. Bellinger
2013-08-22 4:53 ` [PATCH-v2 01/12] scsi: Add CDB definition for COMPARE_AND_WRITE Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 02/12] target: Add return for se_cmd->transport_complete_callback Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 03/12] target: Add TCM_MISCOMPARE_VERIFY sense handling Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 04/12] target: Allow sbc_ops->execute_rw() to accept SGLs + data_direction Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 05/12] target: Convert se_cmd->t_bidi_data_sg checks to use SCF_BIDI Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 06/12] target: Add memory allocation for bidirectional commands Nicholas A. Bellinger
2013-08-24 15:18 ` Christoph Hellwig [this message]
2013-08-24 23:44 ` Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 07/12] target: Add transport_reset_sgl_orig() for COMPARE_AND_WRITE Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 08/12] target: Make __target_execute_cmd() available as extern Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 09/12] target: Add MAXIMUM COMPARE AND WRITE LENGTH in Block Limits VPD Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 10/12] target: Add support for COMPARE_AND_WRITE emulation Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 11/12] target: Add compare_and_write_post() completion callback fall through Nicholas A. Bellinger
2013-08-22 4:54 ` [PATCH-v2 12/12] target: Release COMPARE_AND_WRITE mutex in generic failure path Nicholas A. Bellinger
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