From: "Derrick, Jonathan" <jonathan.derrick@intel.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"zub@linux.fjfi.cvut.cz" <zub@linux.fjfi.cvut.cz>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"sbauer@plzdonthack.me" <sbauer@plzdonthack.me>,
"axboe@kernel.dk" <axboe@kernel.dk>
Cc: "jonas.rabenstein@studium.uni-erlangen.de"
<jonas.rabenstein@studium.uni-erlangen.de>
Subject: Re: [PATCH v4 09/16] block: sed-opal: split generation of bytestring header and content
Date: Fri, 8 Feb 2019 22:58:13 +0000 [thread overview]
Message-ID: <1549666691.10972.57.camel@intel.com> (raw)
In-Reply-To: <1549054223-12220-10-git-send-email-zub@linux.fjfi.cvut.cz>
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Looks good
Reviewed-by Jon Derrick <jonathan.derrick@intel.com>
On Fri, 2019-02-01 at 21:50 +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
>
> Split the header generation from the (normal) memcpy part if a
> bytestring is copied into the command buffer. This allows in-place
> generation of the bytestring content. For example, copy_from_user may be
> used without an intermediate buffer.
>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
> ---
> block/sed-opal.c | 23 +++++++++++++++--------
> 1 file changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/block/sed-opal.c b/block/sed-opal.c
> index 4225f23b2165..4b0a63b9d7c9 100644
> --- a/block/sed-opal.c
> +++ b/block/sed-opal.c
> @@ -586,14 +586,11 @@ static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
> add_token_u8(err, cmd, number >> (len * 8));
> }
>
> -static void add_token_bytestring(int *err, struct opal_dev *cmd,
> - const u8 *bytestring, size_t len)
> +static u8 *add_bytestring_header(int *err, struct opal_dev *cmd, size_t len)
> {
> size_t header_len = 1;
> bool is_short_atom = true;
> -
> - if (*err)
> - return;
> + char *start;
>
> if (len & ~SHORT_ATOM_LEN_MASK) {
> header_len = 2;
> @@ -602,17 +599,27 @@ static void add_token_bytestring(int *err, struct opal_dev *cmd,
>
> if (!can_add(err, cmd, header_len + len)) {
> pr_debug("Error adding bytestring: end of buffer.\n");
> - return;
> + return NULL;
> }
>
> if (is_short_atom)
> add_short_atom_header(cmd, true, false, len);
> else
> add_medium_atom_header(cmd, true, false, len);
> + start = &cmd->cmd[cmd->pos];
> + return start;
> +}
>
> - memcpy(&cmd->cmd[cmd->pos], bytestring, len);
> - cmd->pos += len;
> +static void add_token_bytestring(int *err, struct opal_dev *cmd,
> + const u8 *bytestring, size_t len)
> +{
> + u8 *start;
>
> + start = add_bytestring_header(err, cmd, len);
> + if (!start)
> + return;
> + memcpy(start, bytestring, len);
> + cmd->pos += len;
> }
>
> static int build_locking_range(u8 *buffer, size_t length, u8 lr)
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next prev parent reply other threads:[~2019-02-08 22:58 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 20:50 [PATCH v4 00/16] block: sed-opal: support shadow MBR done flag and write David Kozub
2019-02-01 20:50 ` [PATCH v4 01/16] block: sed-opal: fix typos and formatting David Kozub
2019-02-04 14:42 ` Christoph Hellwig
2019-02-04 20:28 ` David Kozub
2019-02-08 22:56 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 02/16] block: sed-opal: use correct macro for method length David Kozub
2019-02-04 14:43 ` Christoph Hellwig
2019-02-08 22:56 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 03/16] block: sed-opal: unify space check in add_token_* David Kozub
2019-02-04 14:44 ` Christoph Hellwig
2019-02-04 21:07 ` David Kozub
2019-02-04 21:09 ` Christoph Hellwig
2019-02-08 22:57 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 04/16] block: sed-opal: close parameter list in cmd_finalize David Kozub
2019-02-04 14:44 ` Christoph Hellwig
2019-02-08 22:57 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 05/16] block: sed-opal: unify cmd start David Kozub
2019-02-04 14:45 ` Christoph Hellwig
2019-02-08 22:57 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 06/16] block: sed-opal: unify error handling of responses David Kozub
2019-02-04 14:45 ` Christoph Hellwig
2019-02-01 20:50 ` [PATCH v4 07/16] block: sed-opal: reuse response_get_token to decrease code duplication David Kozub
2019-02-04 14:46 ` Christoph Hellwig
2019-02-08 22:57 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 08/16] block: sed-opal: print failed function address David Kozub
2019-02-04 14:46 ` Christoph Hellwig
2019-02-01 20:50 ` [PATCH v4 09/16] block: sed-opal: split generation of bytestring header and content David Kozub
2019-02-04 14:48 ` Christoph Hellwig
2019-02-08 22:58 ` Derrick, Jonathan [this message]
2019-02-01 20:50 ` [PATCH v4 10/16] block: sed-opal: add ioctl for done-mark of shadow mbr David Kozub
2019-02-04 14:52 ` Christoph Hellwig
2019-02-07 22:56 ` David Kozub
2019-02-08 0:44 ` Derrick, Jonathan
2019-02-08 1:37 ` Scott Bauer
2019-02-10 18:26 ` Scott Bauer
2019-02-10 20:25 ` David Kozub
2019-02-01 20:50 ` [PATCH v4 11/16] block: sed-opal: ioctl for writing to " David Kozub
2019-02-04 17:58 ` kbuild test robot
2019-02-08 22:58 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 12/16] block: sed-opal: unify retrieval of table columns David Kozub
2019-02-04 14:56 ` Christoph Hellwig
2019-02-08 22:58 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 13/16] block: sed-opal: check size of shadow mbr David Kozub
2019-02-08 22:58 ` Derrick, Jonathan
2019-02-10 20:05 ` David Kozub
2019-02-11 21:27 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 14/16] block: sed-opal: pass steps via argument rather than via opal_dev David Kozub
2019-02-04 14:57 ` Christoph Hellwig
2019-02-01 20:50 ` [PATCH v4 15/16] block: sed-opal: don't repeat opal_discovery0 in each steps array David Kozub
2019-02-04 15:01 ` Christoph Hellwig
2019-02-04 22:44 ` David Kozub
2019-02-08 22:59 ` Derrick, Jonathan
2019-02-10 17:46 ` David Kozub
2019-02-11 17:22 ` Derrick, Jonathan
2019-02-01 20:50 ` [PATCH v4 16/16] block: sed-opal: rename next to execute_steps David Kozub
2019-02-04 15:01 ` Christoph Hellwig
2019-02-08 22:59 ` Derrick, Jonathan
2019-02-04 8:55 ` David Kozub
2019-02-04 9:44 ` [PATCH v4 00/16] block: sed-opal: support shadow MBR done flag and write David Kozub
2019-02-04 15:04 ` Christoph Hellwig
2019-02-04 15:36 ` Scott Bauer
2019-02-04 15:44 ` Christoph Hellwig
2019-02-04 23:06 ` David Kozub
2019-02-05 6:57 ` Christoph Hellwig
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