From patchwork Sun Aug 23 22:12:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Douglas Gilbert X-Patchwork-Id: 257876 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B499C433DF for ; Sun, 23 Aug 2020 22:13:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 102BB2072D for ; Sun, 23 Aug 2020 22:13:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727110AbgHWWNp (ORCPT ); Sun, 23 Aug 2020 18:13:45 -0400 Received: from smtp.infotech.no ([82.134.31.41]:54127 "EHLO smtp.infotech.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727079AbgHWWNj (ORCPT ); Sun, 23 Aug 2020 18:13:39 -0400 Received: from localhost (localhost [127.0.0.1]) by smtp.infotech.no (Postfix) with ESMTP id 50F33204157; Mon, 24 Aug 2020 00:13:38 +0200 (CEST) X-Virus-Scanned: by amavisd-new-2.6.6 (20110518) (Debian) at infotech.no Received: from smtp.infotech.no ([127.0.0.1]) by localhost (smtp.infotech.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Dv72JuIYEWyy; Mon, 24 Aug 2020 00:13:36 +0200 (CEST) Received: from xtwo70.bingwo.ca (host-45-78-251-166.dyn.295.ca [45.78.251.166]) by smtp.infotech.no (Postfix) with ESMTPA id 964F820425B; Mon, 24 Aug 2020 00:13:34 +0200 (CEST) From: Douglas Gilbert To: linux-scsi@vger.kernel.org Cc: martin.petersen@oracle.com, jejb@linux.vnet.ibm.com, hare@suse.de Subject: [PATCH v10 31/40] sg: add sg_iosubmit_v3 and sg_ioreceive_v3 ioctls Date: Sun, 23 Aug 2020 18:12:39 -0400 Message-Id: <20200823221248.15678-32-dgilbert@interlog.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200823221248.15678-1-dgilbert@interlog.com> References: <20200823221248.15678-1-dgilbert@interlog.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add ioctl(SG_IOSUBMIT_V3) and ioctl(SG_IORECEIVE_V3). These ioctls are meant to be (almost) drop-in replacements for the write()/read() async version 3 interface. They only accept the version 3 interface. See the webpage at: http://sg.danny.cz/sg/sg_v40.html specifically the table in the section titled: "13 SG interface support changes". If sgv3 is a struct sg_io_hdr object, suitably configured, then res = write(sg_fd, &sgv3, sizeof(sgv3)); and res = ioctl(sg_fd, SG_IOSUBMIT_V3, &sgv3); are equivalent. Dito for read() and ioctl(SG_IORECEIVE_V3). Reviewed-by: Hannes Reinecke Signed-off-by: Douglas Gilbert --- drivers/scsi/sg.c | 75 ++++++++++++++++++++++++++++++++++++++++++ include/uapi/scsi/sg.h | 6 ++++ 2 files changed, 81 insertions(+) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 04efc57d5dc4..8d2ecc553fef 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -834,6 +834,24 @@ sg_ctl_iosubmit(struct file *filp, struct sg_fd *sfp, void __user *p) return -EPERM; } +static int +sg_ctl_iosubmit_v3(struct file *filp, struct sg_fd *sfp, void __user *p) +{ + int res; + u8 hdr_store[SZ_SG_IO_V4]; /* max(v3interface, v4interface) */ + struct sg_io_hdr *h3p = (struct sg_io_hdr *)hdr_store; + struct sg_device *sdp = sfp->parentdp; + + res = sg_allow_if_err_recovery(sdp, (filp->f_flags & O_NONBLOCK)); + if (unlikely(res)) + return res; + if (copy_from_user(h3p, p, SZ_SG_IO_HDR)) + return -EFAULT; + if (h3p->interface_id == 'S') + return sg_v3_submit(filp, sfp, h3p, false, NULL); + return -EPERM; +} + #if IS_ENABLED(SG_LOG_ACTIVE) static void sg_rq_state_fail(struct sg_fd *sfp, enum sg_rq_state exp_old_st, @@ -1283,6 +1301,57 @@ sg_ctl_ioreceive(struct file *filp, struct sg_fd *sfp, void __user *p) return sg_receive_v4(sfp, srp, p, h4p); } +/* + * Called when ioctl(SG_IORECEIVE_V3) received. Expects a v3 interface. + * Checks if O_NONBLOCK file flag given, if not checks given flags field + * to see if SGV4_FLAG_IMMED is set. Either of these implies non blocking. + * When non-blocking and there is no request waiting, yields EAGAIN; + * otherwise it waits. + */ +static int +sg_ctl_ioreceive_v3(struct file *filp, struct sg_fd *sfp, void __user *p) +{ + bool non_block = !!(filp->f_flags & O_NONBLOCK); + int res; + int pack_id = SG_PACK_ID_WILDCARD; + u8 v3_holder[SZ_SG_IO_HDR]; + struct sg_io_hdr *h3p = (struct sg_io_hdr *)v3_holder; + struct sg_device *sdp = sfp->parentdp; + struct sg_request *srp; + + res = sg_allow_if_err_recovery(sdp, non_block); + if (unlikely(res)) + return res; + /* Get first three 32 bit integers: guard, proto+subproto */ + if (copy_from_user(h3p, p, SZ_SG_IO_HDR)) + return -EFAULT; + /* for v3: interface_id=='S' (in a 32 bit int) */ + if (h3p->interface_id != 'S') + return -EPERM; + if (h3p->flags & SGV4_FLAG_IMMED) + non_block = true; /* set by either this or O_NONBLOCK */ + SG_LOG(3, sfp, "%s: non_block(+IMMED)=%d\n", __func__, non_block); + + if (test_bit(SG_FFD_FORCE_PACKID, sfp->ffd_bm)) + pack_id = h3p->pack_id; + + srp = sg_find_srp_by_id(sfp, pack_id); + if (!srp) { /* nothing available so wait on packet or */ + if (unlikely(SG_IS_DETACHING(sdp))) + return -ENODEV; + if (non_block) + return -EAGAIN; + res = wait_event_interruptible + (sfp->read_wait, + sg_get_ready_srp(sfp, &srp, pack_id)); + if (unlikely(SG_IS_DETACHING(sdp))) + return -ENODEV; + if (unlikely(res)) + return res; /* signal --> -ERESTARTSYS */ + } /* now srp should be valid */ + return sg_receive_v3(sfp, srp, SZ_SG_IO_HDR, p); +} + static int sg_read_v1v2(void __user *buf, int count, struct sg_fd *sfp, struct sg_request *srp) @@ -1874,9 +1943,15 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, case SG_IOSUBMIT: SG_LOG(3, sfp, "%s: SG_IOSUBMIT\n", __func__); return sg_ctl_iosubmit(filp, sfp, p); + case SG_IOSUBMIT_V3: + SG_LOG(3, sfp, "%s: SG_IOSUBMIT_V3\n", __func__); + return sg_ctl_iosubmit_v3(filp, sfp, p); case SG_IORECEIVE: SG_LOG(3, sfp, "%s: SG_IORECEIVE\n", __func__); return sg_ctl_ioreceive(filp, sfp, p); + case SG_IORECEIVE_V3: + SG_LOG(3, sfp, "%s: SG_IORECEIVE_V3\n", __func__); + return sg_ctl_ioreceive_v3(filp, sfp, p); case SG_GET_SCSI_ID: return sg_ctl_scsi_id(sdev, sfp, p); case SG_SET_FORCE_PACK_ID: diff --git a/include/uapi/scsi/sg.h b/include/uapi/scsi/sg.h index 182001023360..cbade2870355 100644 --- a/include/uapi/scsi/sg.h +++ b/include/uapi/scsi/sg.h @@ -357,6 +357,12 @@ struct sg_header { /* Gives some v4 identifying info to driver, receives associated response */ #define SG_IORECEIVE _IOWR(SG_IOCTL_MAGIC_NUM, 0x42, struct sg_io_v4) +/* Submits a v3 interface object to driver */ +#define SG_IOSUBMIT_V3 _IOWR(SG_IOCTL_MAGIC_NUM, 0x45, struct sg_io_hdr) + +/* Gives some v3 identifying info to driver, receives associated response */ +#define SG_IORECEIVE_V3 _IOWR(SG_IOCTL_MAGIC_NUM, 0x46, struct sg_io_hdr) + /* command queuing is always on when the v3 or v4 interface is used */ #define SG_DEF_COMMAND_Q 0