From patchwork Tue Apr 27 21:56:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Douglas Gilbert X-Patchwork-Id: 12227555 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 A6D9CC43461 for ; Tue, 27 Apr 2021 21:59:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 820A1613FF for ; Tue, 27 Apr 2021 21:59:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239075AbhD0V74 (ORCPT ); Tue, 27 Apr 2021 17:59:56 -0400 Received: from smtp.infotech.no ([82.134.31.41]:38966 "EHLO smtp.infotech.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239468AbhD0V7c (ORCPT ); Tue, 27 Apr 2021 17:59:32 -0400 Received: from localhost (localhost [127.0.0.1]) by smtp.infotech.no (Postfix) with ESMTP id 227502041C0; Tue, 27 Apr 2021 23:58:47 +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 hIU5MNe-m8kY; Tue, 27 Apr 2021 23:58:44 +0200 (CEST) Received: from xtwo70.bingwo.ca (host-45-58-219-4.dyn.295.ca [45.58.219.4]) by smtp.infotech.no (Postfix) with ESMTPA id 460182041BB; Tue, 27 Apr 2021 23:58:43 +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 v18 46/83] sg: add sg_ioabort ioctl Date: Tue, 27 Apr 2021 17:56:56 -0400 Message-Id: <20210427215733.417746-48-dgilbert@interlog.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210427215733.417746-1-dgilbert@interlog.com> References: <20210427215733.417746-1-dgilbert@interlog.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add ioctl(SG_IOABORT) that acts as a front-end to blk_abort_request() which is only called if the request is "inflight". The request to abort is matched via its pack_id and the scope of the search is the current device. That scope will be fine tuned in a later patch to being either all file descriptors belonging to the current device, or just the current file descriptor. Signed-off-by: Douglas Gilbert --- drivers/scsi/sg.c | 170 ++++++++++++++++++++++++++++++----------- include/uapi/scsi/sg.h | 3 + 2 files changed, 128 insertions(+), 45 deletions(-) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index b5dc274a57c0..d8628517fbe0 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -113,6 +113,7 @@ enum sg_rq_state { /* N.B. sg_rq_state_arr assumes SG_RS_AWAIT_RCV==2 */ #define SG_FRQ_IS_ORPHAN 1 /* owner of request gone */ #define SG_FRQ_SYNC_INVOC 2 /* synchronous (blocking) invocation */ #define SG_FRQ_NO_US_XFER 3 /* no user space transfer of data */ +#define SG_FRQ_ABORTING 4 /* in process of aborting this cmd */ #define SG_FRQ_DEACT_ORPHAN 6 /* not keeping orphan so de-activate */ #define SG_FRQ_RECEIVING 7 /* guard against multiple receivers */ #define SG_FRQ_FOR_MMAP 8 /* request needs PAGE_SIZE elements */ @@ -1794,6 +1795,93 @@ sg_ctl_sg_io(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, return res; } +static struct sg_request * +sg_match_request(struct sg_fd *sfp, int id) +{ + int num_waiting = atomic_read(&sfp->waiting); + unsigned long idx; + struct sg_request *srp; + + if (num_waiting < 1) + return NULL; + if (id == SG_PACK_ID_WILDCARD) { + xa_for_each_marked(&sfp->srp_arr, idx, srp, SG_XA_RQ_AWAIT) + return srp; + } else { + xa_for_each_marked(&sfp->srp_arr, idx, srp, SG_XA_RQ_AWAIT) { + if (id == srp->pack_id) + return srp; + } + } + return NULL; +} + +static int +sg_ctl_abort(struct sg_device *sdp, struct sg_fd *sfp, void __user *p) +{ + int res, pack_id, id; + unsigned long iflags, idx; + struct sg_fd *o_sfp; + struct sg_request *srp; + struct sg_io_v4 io_v4; + struct sg_io_v4 *h4p = &io_v4; + + if (copy_from_user(h4p, p, SZ_SG_IO_V4)) + return -EFAULT; + if (h4p->guard != 'Q' || h4p->protocol != 0 || h4p->subprotocol != 0) + return -EPERM; + pack_id = h4p->request_extra; + id = pack_id; + + xa_lock_irqsave(&sfp->srp_arr, iflags); + srp = sg_match_request(sfp, id); + if (!srp) { /* assume device (not just fd) scope */ + xa_unlock_irqrestore(&sfp->srp_arr, iflags); + xa_for_each(&sdp->sfp_arr, idx, o_sfp) { + if (o_sfp == sfp) + continue; /* already checked */ + srp = sg_match_request(o_sfp, id); + if (srp) { + sfp = o_sfp; + xa_lock_irqsave(&sfp->srp_arr, iflags); + break; + } + } + if (!srp) + return -ENODATA; + } + + set_bit(SG_FRQ_ABORTING, srp->frq_bm); + res = 0; + switch (atomic_read(&srp->rq_st)) { + case SG_RS_BUSY: + clear_bit(SG_FRQ_ABORTING, srp->frq_bm); + res = -EBUSY; /* shouldn't occur often */ + break; + case SG_RS_INACTIVE: /* inactive on rq_list not good */ + clear_bit(SG_FRQ_ABORTING, srp->frq_bm); + res = -EPROTO; + break; + case SG_RS_AWAIT_RCV: /* user should still do completion */ + clear_bit(SG_FRQ_ABORTING, srp->frq_bm); + break; /* nothing to do here, return 0 */ + case SG_RS_INFLIGHT: /* only attempt abort if inflight */ + srp->rq_result |= (DRIVER_SOFT << 24); + { + struct request *rqq = READ_ONCE(srp->rqq); + + if (rqq) + blk_abort_request(rqq); + } + break; + default: + clear_bit(SG_FRQ_ABORTING, srp->frq_bm); + break; + } + xa_unlock_irqrestore(&sfp->srp_arr, iflags); + return res; +} + /* * First normalize want_rsv_sz to be >= sfp->sgat_elem_sz and * <= max_segment_size. Exit if that is the same as old size; otherwise @@ -1929,8 +2017,6 @@ sg_ctl_req_tbl(struct sg_fd *sfp, void __user *p) return -ENOMEM; val = 0; xa_for_each(&sfp->srp_arr, idx, srp) { - if (!srp) - continue; if (val >= SG_MAX_QUEUE) break; if (xa_get_mark(&sfp->srp_arr, idx, SG_XA_RQ_INACTIVE)) @@ -1939,8 +2025,6 @@ sg_ctl_req_tbl(struct sg_fd *sfp, void __user *p) val++; } xa_for_each(&sfp->srp_arr, idx, srp) { - if (!srp) - continue; if (val >= SG_MAX_QUEUE) break; if (!xa_get_mark(&sfp->srp_arr, idx, SG_XA_RQ_INACTIVE)) @@ -1990,7 +2074,7 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, { bool read_only = O_RDWR != (filp->f_flags & O_ACCMODE); int val; - int result = 0; + int res = 0; int __user *ip = p; struct sg_request *srp; struct scsi_device *sdev; @@ -2018,13 +2102,21 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, case SG_IORECEIVE_V3: SG_LOG(3, sfp, "%s: SG_IORECEIVE_V3\n", __func__); return sg_ctl_ioreceive_v3(filp, sfp, p); + case SG_IOABORT: + SG_LOG(3, sfp, "%s: SG_IOABORT\n", __func__); + if (read_only) + return -EPERM; + mutex_lock(&sfp->f_mutex); + res = sg_ctl_abort(sdp, sfp, p); + mutex_unlock(&sfp->f_mutex); + return res; case SG_GET_SCSI_ID: return sg_ctl_scsi_id(sdev, sfp, p); case SG_SET_FORCE_PACK_ID: SG_LOG(3, sfp, "%s: SG_SET_FORCE_PACK_ID\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; assign_bit(SG_FFD_FORCE_PACKID, sfp->ffd_bm, !!val); return 0; case SG_GET_PACK_ID: /* or tag of oldest "read"-able, -1 if none */ @@ -2049,18 +2141,18 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, sdp->max_sgat_sz); return put_user(sdp->max_sgat_sz, ip); case SG_SET_RESERVED_SIZE: - result = get_user(val, ip); - if (!result) { + res = get_user(val, ip); + if (!res) { if (val >= 0 && val <= (1024 * 1024 * 1024)) { mutex_lock(&sfp->f_mutex); - result = sg_set_reserved_sz(sfp, val); + res = sg_set_reserved_sz(sfp, val); mutex_unlock(&sfp->f_mutex); } else { SG_LOG(3, sfp, "%s: invalid size\n", __func__); - result = -EINVAL; + res = -EINVAL; } } - return result; + return res; case SG_GET_RESERVED_SIZE: mutex_lock(&sfp->f_mutex); val = min_t(int, sfp->rsv_srp->sgat_h.buflen, @@ -2068,13 +2160,13 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, mutex_unlock(&sfp->f_mutex); SG_LOG(3, sfp, "%s: SG_GET_RESERVED_SIZE=%d\n", __func__, val); - result = put_user(val, ip); - return result; + res = put_user(val, ip); + return res; case SG_SET_COMMAND_Q: SG_LOG(3, sfp, "%s: SG_SET_COMMAND_Q\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; assign_bit(SG_FFD_CMD_Q, sfp->ffd_bm, !!val); return 0; case SG_GET_COMMAND_Q: @@ -2082,9 +2174,9 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, return put_user(test_bit(SG_FFD_CMD_Q, sfp->ffd_bm), ip); case SG_SET_KEEP_ORPHAN: SG_LOG(3, sfp, "%s: SG_SET_KEEP_ORPHAN\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; assign_bit(SG_FFD_KEEP_ORPHAN, sfp->ffd_bm, !!val); return 0; case SG_GET_KEEP_ORPHAN: @@ -2101,9 +2193,9 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, break; case SG_SET_TIMEOUT: SG_LOG(3, sfp, "%s: SG_SET_TIMEOUT\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; if (val < 0) return -EIO; if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ)) @@ -2129,9 +2221,9 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, return put_user((int)sdev->host->unchecked_isa_dma, ip); case SG_NEXT_CMD_LEN: /* active only in v2 interface */ SG_LOG(3, sfp, "%s: SG_NEXT_CMD_LEN\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; if (val > SG_MAX_CDB_SIZE) return -ENOMEM; mutex_lock(&sfp->f_mutex); @@ -2154,9 +2246,9 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, p); case SG_SET_DEBUG: SG_LOG(3, sfp, "%s: SG_SET_DEBUG\n", __func__); - result = get_user(val, ip); - if (result) - return result; + res = get_user(val, ip); + if (res) + return res; assign_bit(SG_FDEV_LOG_SENSE, sdp->fdev_bm, !!val); if (val == 0) /* user can force recalculation */ sg_calc_sgat_param(sdp); @@ -2201,9 +2293,9 @@ sg_ioctl_common(struct file *filp, struct sg_device *sdp, struct sg_fd *sfp, return -EPERM; /* don't know, so take safer approach */ break; } - result = sg_allow_if_err_recovery(sdp, filp->f_flags & O_NDELAY); - if (unlikely(result)) - return result; + res = sg_allow_if_err_recovery(sdp, filp->f_flags & O_NDELAY); + if (unlikely(res)) + return res; return -ENOIOCTLCMD; } @@ -2844,8 +2936,6 @@ sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) "%s: 0x%pK\n", __func__, sdp)); xa_for_each(&sdp->sfp_arr, idx, sfp) { - if (!sfp) - continue; wake_up_interruptible_all(&sfp->read_wait); kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); } @@ -3867,8 +3957,6 @@ sg_remove_sfp_usercontext(struct work_struct *work) /* Cleanup any responses which were never read(). */ xa_for_each(xafp, idx, srp) { - if (!srp) - continue; if (!xa_get_mark(xafp, srp->rq_idx, SG_XA_RQ_INACTIVE)) sg_finish_scsi_blk_rq(srp); if (srp->sgat_h.buflen > 0) @@ -4173,7 +4261,6 @@ sg_proc_seq_show_devstrs(struct seq_file *s, void *v) /* Writes debug info for one sg_request in obp buffer */ static int sg_proc_debug_sreq(struct sg_request *srp, int to, char *obp, int len) - __must_hold(sfp->srp_arr.xa_lock) { bool is_v3v4, v4, is_dur; int n = 0; @@ -4243,8 +4330,6 @@ sg_proc_debug_fd(struct sg_fd *fp, char *obp, int len, unsigned long idx) k = 0; xa_lock_irqsave(&fp->srp_arr, iflags); xa_for_each(&fp->srp_arr, idx, srp) { - if (!srp) - continue; if (xa_get_mark(&fp->srp_arr, idx, SG_XA_RQ_INACTIVE)) continue; n += sg_proc_debug_sreq(srp, fp->timeout, obp + n, len - n); @@ -4259,8 +4344,6 @@ sg_proc_debug_fd(struct sg_fd *fp, char *obp, int len, unsigned long idx) n += scnprintf(obp + n, len - n, " No requests active\n"); k = 0; xa_for_each_marked(&fp->srp_arr, idx, srp, SG_XA_RQ_INACTIVE) { - if (!srp) - continue; if (k == 0) n += scnprintf(obp + n, len - n, " Inactives:\n"); n += sg_proc_debug_sreq(srp, fp->timeout, obp + n, len - n); @@ -4278,7 +4361,6 @@ sg_proc_debug_fd(struct sg_fd *fp, char *obp, int len, unsigned long idx) /* Writes debug info for one sg device (including its sg fds) in obp buffer */ static int sg_proc_debug_sdev(struct sg_device *sdp, char *obp, int len, int *fd_counterp) - __must_hold(sg_index_lock) { int n = 0; int my_count = 0; @@ -4298,8 +4380,6 @@ sg_proc_debug_sdev(struct sg_device *sdp, char *obp, int len, int *fd_counterp) ilog2(sdp->max_sgat_sz), sdp->max_sgat_elems, SG_HAVE_EXCLUDE(sdp), atomic_read(&sdp->open_cnt)); xa_for_each(&sdp->sfp_arr, idx, fp) { - if (!fp) - continue; ++*countp; n += scnprintf(obp + n, len - n, " FD(%d): ", *countp); n += sg_proc_debug_fd(fp, obp + n, len - n, idx); diff --git a/include/uapi/scsi/sg.h b/include/uapi/scsi/sg.h index 079ef6c57aea..2b1b9df6c114 100644 --- a/include/uapi/scsi/sg.h +++ b/include/uapi/scsi/sg.h @@ -364,6 +364,9 @@ struct sg_header { /* Gives some v3 identifying info to driver, receives associated response */ #define SG_IORECEIVE_V3 _IOWR(SG_IOCTL_MAGIC_NUM, 0x46, struct sg_io_hdr) +/* Provides identifying info about a prior submission (e.g. a tag) */ +#define SG_IOABORT _IOW(SG_IOCTL_MAGIC_NUM, 0x43, struct sg_io_v4) + /* command queuing is always on when the v3 or v4 interface is used */ #define SG_DEF_COMMAND_Q 0