From patchwork Thu May 28 08:42:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 213864 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 899F3C433E0 for ; Thu, 28 May 2020 08:54:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 701A82088E for ; Thu, 28 May 2020 08:54:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728000AbgE1IyG (ORCPT ); Thu, 28 May 2020 04:54:06 -0400 Received: from mx2.suse.de ([195.135.220.15]:50336 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727814AbgE1IyF (ORCPT ); Thu, 28 May 2020 04:54:05 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id B285AB428; Thu, 28 May 2020 08:54:01 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , Doug Gilbert , Johannes Thumshirn , Daniel Wagner , James Bottomley , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCH 3/4] scsi: move target device list to xarray Date: Thu, 28 May 2020 10:42:26 +0200 Message-Id: <20200528084227.122885-4-hare@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200528084227.122885-1-hare@suse.de> References: <20200528084227.122885-1-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Use xarray for device lookup by target. LUNs below 256 are linear, and can be used directly as the index into the xarray. LUNs above 256 have a distinct LUN format, and are not necessarily linear. They'll be stored in indices above 256 in the xarray, with the next free index in the xarray. Signed-off-by: Hannes Reinecke Reviewed-by: Johannes Thumshirn --- drivers/scsi/scsi.c | 39 ++++++++++++++++++++------------------- drivers/scsi/scsi_lib.c | 9 ++++----- drivers/scsi/scsi_scan.c | 3 +-- drivers/scsi/scsi_sysfs.c | 17 +++++++++++++++-- include/scsi/scsi_device.h | 4 ++-- 5 files changed, 42 insertions(+), 30 deletions(-) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index d119ee7177e0..9dbbc51a1eb5 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -601,13 +601,14 @@ static struct scsi_target *__scsi_target_lookup(struct Scsi_Host *shost, void starget_for_each_device(struct scsi_target *starget, void *data, void (*fn)(struct scsi_device *, void *)) { - struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct scsi_device *sdev; + unsigned long lun_id = 0; - shost_for_each_device(sdev, shost) { - if ((sdev->channel == starget->channel) && - (sdev->id == starget->id)) - fn(sdev, data); + xa_for_each(&starget->devices, lun_id, sdev) { + if (scsi_device_get(sdev)) + continue; + fn(sdev, data); + scsi_device_put(sdev); } } EXPORT_SYMBOL(starget_for_each_device); @@ -629,14 +630,11 @@ EXPORT_SYMBOL(starget_for_each_device); void __starget_for_each_device(struct scsi_target *starget, void *data, void (*fn)(struct scsi_device *, void *)) { - struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct scsi_device *sdev; + unsigned long lun_id = 0; - __shost_for_each_device(sdev, shost) { - if ((sdev->channel == starget->channel) && - (sdev->id == starget->id)) - fn(sdev, data); - } + xa_for_each(&starget->devices, lun_id, sdev) + fn(sdev, data); } EXPORT_SYMBOL(__starget_for_each_device); @@ -659,11 +657,19 @@ struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, u64 lun) { struct scsi_device *sdev; + unsigned long lun_idx = 256; + + if (lun < lun_idx) { + sdev = xa_load(&starget->devices, lun); + if (sdev && sdev->sdev_state == SDEV_DEL) + sdev = NULL; + return sdev; + } - list_for_each_entry(sdev, &starget->devices, same_target_siblings) { + xa_for_each(&starget->devices, lun_idx, sdev) { if (sdev->sdev_state == SDEV_DEL) continue; - if (sdev->lun ==lun) + if (sdev->lun == lun) return sdev; } @@ -717,16 +723,11 @@ struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, u16 channel, u16 id, u64 lun) { struct scsi_target *starget; - struct scsi_device *sdev; starget = __scsi_target_lookup(shost, channel, id); if (!starget) return NULL; - sdev = __scsi_device_lookup_by_target(starget, lun); - if (sdev && sdev->sdev_state == SDEV_DEL) - sdev = NULL; - - return sdev; + return __scsi_device_lookup_by_target(starget, lun); } EXPORT_SYMBOL(__scsi_device_lookup); diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index c163fa22267c..e818c5de6ff4 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -361,9 +361,9 @@ static void scsi_kick_queue(struct request_queue *q) static void scsi_single_lun_run(struct scsi_device *current_sdev) { struct Scsi_Host *shost = current_sdev->host; - struct scsi_device *sdev, *tmp; + struct scsi_device *sdev; struct scsi_target *starget = scsi_target(current_sdev); - unsigned long flags; + unsigned long flags, lun_id = 0; spin_lock_irqsave(shost->host_lock, flags); starget->starget_sdev_user = NULL; @@ -380,8 +380,7 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev) spin_lock_irqsave(shost->host_lock, flags); if (starget->starget_sdev_user) goto out; - list_for_each_entry_safe(sdev, tmp, &starget->devices, - same_target_siblings) { + xa_for_each(&starget->devices, lun_id, sdev) { if (sdev == current_sdev) continue; if (scsi_device_get(sdev)) @@ -390,9 +389,9 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev) spin_unlock_irqrestore(shost->host_lock, flags); scsi_kick_queue(sdev->request_queue); spin_lock_irqsave(shost->host_lock, flags); - scsi_device_put(sdev); } + out: spin_unlock_irqrestore(shost->host_lock, flags); } diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index dc2656df495b..c7aba9ba5c0c 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -235,7 +235,6 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, mutex_init(&sdev->state_mutex); sdev->sdev_state = SDEV_CREATED; INIT_LIST_HEAD(&sdev->siblings); - INIT_LIST_HEAD(&sdev->same_target_siblings); INIT_LIST_HEAD(&sdev->starved_entry); INIT_LIST_HEAD(&sdev->event_list); spin_lock_init(&sdev->list_lock); @@ -417,7 +416,7 @@ static struct scsi_target *scsi_alloc_target(struct device *parent, starget->id = id; starget->channel = channel; starget->can_queue = 0; - INIT_LIST_HEAD(&starget->devices); + xa_init(&starget->devices); starget->state = STARGET_CREATED; starget->scsi_level = SCSI_2; starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 95aaa96ce03b..27c19232f175 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -434,6 +434,7 @@ static void scsi_device_cls_release(struct device *class_dev) static void scsi_device_dev_release_usercontext(struct work_struct *work) { struct scsi_device *sdev; + struct scsi_target *starget; struct device *parent; struct list_head *this, *tmp; struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL; @@ -441,6 +442,7 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work) unsigned long flags; sdev = container_of(work, struct scsi_device, ew.work); + starget = sdev->sdev_target; scsi_dh_release_device(sdev); @@ -448,7 +450,7 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work) spin_lock_irqsave(sdev->host->host_lock, flags); list_del(&sdev->siblings); - list_del(&sdev->same_target_siblings); + xa_erase(&starget->devices, sdev->lun_idx); list_del(&sdev->starved_entry); spin_unlock_irqrestore(sdev->host->host_lock, flags); @@ -1621,7 +1623,18 @@ void scsi_sysfs_device_initialize(struct scsi_device *sdev) transport_setup_device(&sdev->sdev_gendev); spin_lock_irqsave(shost->host_lock, flags); - list_add_tail(&sdev->same_target_siblings, &starget->devices); + if (sdev->lun < 256) { + sdev->lun_idx = sdev->lun; + WARN_ON(xa_insert(&starget->devices, sdev->lun_idx, + sdev, GFP_KERNEL) < 0); + } else { + struct xa_limit scsi_lun_limit = { + .min = 256, + .max = UINT_MAX, + }; + WARN_ON(xa_alloc(&starget->devices, &sdev->lun_idx, + sdev, scsi_lun_limit, GFP_KERNEL) < 0); + } list_add_tail(&sdev->siblings, &shost->__devices); spin_unlock_irqrestore(shost->host_lock, flags); /* diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 28034cc0fce5..2c6b9d8bc40e 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -104,7 +104,6 @@ struct scsi_device { /* the next two are protected by the host->host_lock */ struct list_head siblings; /* list of all devices on this host */ - struct list_head same_target_siblings; /* just the devices sharing same target id */ atomic_t device_busy; /* commands actually active on LLDD */ atomic_t device_blocked; /* Device returned QUEUE_FULL. */ @@ -123,6 +122,7 @@ struct scsi_device { unsigned int id, channel; u64 lun; + unsigned int lun_idx; /* Index into target device xarray */ unsigned int manufacturer; /* Manufacturer of device, for using * vendor-specific cmd's */ unsigned sector_size; /* size in bytes */ @@ -285,7 +285,7 @@ enum scsi_target_state { struct scsi_target { struct scsi_device *starget_sdev_user; struct list_head siblings; - struct list_head devices; + struct xarray devices; struct device dev; struct kref reap_ref; /* last put renders target invisible */ unsigned int channel; From patchwork Thu May 28 08:42:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 213865 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 BFBF7C433DF for ; Thu, 28 May 2020 08:54:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A51D82088E for ; Thu, 28 May 2020 08:54:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728003AbgE1IyB (ORCPT ); Thu, 28 May 2020 04:54:01 -0400 Received: from mx2.suse.de ([195.135.220.15]:49642 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727786AbgE1Ix6 (ORCPT ); Thu, 28 May 2020 04:53:58 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 9C9ADB33D; Thu, 28 May 2020 08:53:54 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , Doug Gilbert , Johannes Thumshirn , Daniel Wagner , James Bottomley , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCH 4/4] scsi: remove direct device lookup per host Date: Thu, 28 May 2020 10:42:27 +0200 Message-Id: <20200528084227.122885-5-hare@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200528084227.122885-1-hare@suse.de> References: <20200528084227.122885-1-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Drop the per-host device list for direct lookup and iterate over the targets and devices xarrays instead. As both are now using xarrays the lookup is more efficient as we can use the provided indices based on the HCTL id to do a direct lookup instead of traversing lists. Signed-off-by: Hannes Reinecke --- drivers/scsi/hosts.c | 1 - drivers/scsi/scsi.c | 67 +++++++++++++++++++++++++++++++++++++++++----- drivers/scsi/scsi_scan.c | 20 ++++++++------ drivers/scsi/scsi_sysfs.c | 10 ++----- include/scsi/scsi_device.h | 13 +++++---- include/scsi/scsi_host.h | 3 +-- 6 files changed, 84 insertions(+), 30 deletions(-) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 7109afad0183..004a50a95560 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -382,7 +382,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) shost->host_lock = &shost->default_lock; spin_lock_init(shost->host_lock); shost->shost_state = SHOST_CREATED; - INIT_LIST_HEAD(&shost->__devices); xa_init(&shost->__targets); INIT_LIST_HEAD(&shost->eh_cmd_q); INIT_LIST_HEAD(&shost->starved_list); diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 9dbbc51a1eb5..eac505a169a7 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -554,18 +554,40 @@ EXPORT_SYMBOL(scsi_device_put); struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, struct scsi_device *prev) { - struct list_head *list = (prev ? &prev->siblings : &shost->__devices); + struct scsi_target *starget; struct scsi_device *next = NULL; unsigned long flags; + unsigned long tid = 0, lun_idx = 0; spin_lock_irqsave(shost->host_lock, flags); - while (list->next != &shost->__devices) { - next = list_entry(list->next, struct scsi_device, siblings); - /* skip devices that we can't get a reference to */ + if (!prev) { + starget = xa_find(&shost->__targets, &tid, + ULONG_MAX, XA_PRESENT); + if (starget) { + next = xa_find(&starget->devices, &lun_idx, + ULONG_MAX, XA_PRESENT); + if (!scsi_device_get(next)) { + spin_unlock_irqrestore(shost->host_lock, flags); + return next; + } + } + } else { + starget = prev->sdev_target; + tid = (starget->channel << 16) | starget->id; + lun_idx = prev->lun_idx; + } + while (starget) { + next = xa_find_after(&starget->devices, &lun_idx, + ULONG_MAX, XA_PRESENT); + if (!next) { + /* No more LUNs on this target, switch to the next */ + lun_idx = 0; + starget = xa_find_after(&shost->__targets, &tid, + ULONG_MAX, XA_PRESENT); + continue; + } if (!scsi_device_get(next)) break; - next = NULL; - list = list->next; } spin_unlock_irqrestore(shost->host_lock, flags); @@ -575,6 +597,39 @@ struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, } EXPORT_SYMBOL(__scsi_iterate_devices); +/* helper for __shost_for_each_device, see that for documentation */ +struct scsi_device *__scsi_iterate_devices_unlocked(struct Scsi_Host *shost, + struct scsi_device *prev) +{ + struct scsi_target *starget; + struct scsi_device *next = NULL; + unsigned long tid = 0, lun_idx = 0; + + if (!prev) { + starget = xa_find(&shost->__targets, &tid, + ULONG_MAX, XA_PRESENT); + if (starget) + return xa_find(&starget->devices, &lun_idx, + ULONG_MAX, XA_PRESENT); + } else { + starget = prev->sdev_target; + tid = (starget->channel << 16) | starget->id; + lun_idx = prev->lun_idx; + } + while (starget) { + next = xa_find_after(&starget->devices, &lun_idx, + ULONG_MAX, XA_PRESENT); + if (next) + return next; + /* No more LUNs on this target, switch to the next */ + lun_idx = 0; + starget = xa_find_after(&shost->__targets, &tid, + ULONG_MAX, XA_PRESENT); + } + return NULL; +} +EXPORT_SYMBOL(__scsi_iterate_devices_unlocked); + /** * __scsi_target_lookup - find a target based on channel and target id * @shost: SCSI host pointer diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index c7aba9ba5c0c..e75e7f93f8f6 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -234,7 +234,6 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, sdev->channel = starget->channel; mutex_init(&sdev->state_mutex); sdev->sdev_state = SDEV_CREATED; - INIT_LIST_HEAD(&sdev->siblings); INIT_LIST_HEAD(&sdev->starved_entry); INIT_LIST_HEAD(&sdev->event_list); spin_lock_init(&sdev->list_lock); @@ -1847,17 +1846,22 @@ EXPORT_SYMBOL(scsi_scan_host); void scsi_forget_host(struct Scsi_Host *shost) { + struct scsi_target *starget; struct scsi_device *sdev; unsigned long flags; + unsigned long tid = 0; - restart: spin_lock_irqsave(shost->host_lock, flags); - list_for_each_entry(sdev, &shost->__devices, siblings) { - if (sdev->sdev_state == SDEV_DEL) - continue; - spin_unlock_irqrestore(shost->host_lock, flags); - __scsi_remove_device(sdev); - goto restart; + xa_for_each(&shost->__targets, tid, starget) { + unsigned long lun_id = 0; + + xa_for_each(&starget->devices, lun_id, sdev) { + if (sdev->sdev_state == SDEV_DEL) + continue; + spin_unlock_irqrestore(shost->host_lock, flags); + __scsi_remove_device(sdev); + spin_lock_irqsave(shost->host_lock, flags); + } } spin_unlock_irqrestore(shost->host_lock, flags); } diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 27c19232f175..63fa57684782 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -449,7 +449,6 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work) parent = sdev->sdev_gendev.parent; spin_lock_irqsave(sdev->host->host_lock, flags); - list_del(&sdev->siblings); xa_erase(&starget->devices, sdev->lun_idx); list_del(&sdev->starved_entry); spin_unlock_irqrestore(sdev->host->host_lock, flags); @@ -1476,19 +1475,16 @@ static void __scsi_remove_target(struct scsi_target *starget) struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); unsigned long flags; struct scsi_device *sdev; + unsigned long lun_idx = 0; spin_lock_irqsave(shost->host_lock, flags); - restart: - list_for_each_entry(sdev, &shost->__devices, siblings) { + xa_for_each(&starget->devices, lun_idx, sdev) { /* * We cannot call scsi_device_get() here, as * we might've been called from rmmod() causing * scsi_device_get() to fail the module_is_live() * check. */ - if (sdev->channel != starget->channel || - sdev->id != starget->id) - continue; if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL || !get_device(&sdev->sdev_gendev)) @@ -1497,7 +1493,6 @@ static void __scsi_remove_target(struct scsi_target *starget) scsi_remove_device(sdev); put_device(&sdev->sdev_gendev); spin_lock_irqsave(shost->host_lock, flags); - goto restart; } spin_unlock_irqrestore(shost->host_lock, flags); } @@ -1635,7 +1630,6 @@ void scsi_sysfs_device_initialize(struct scsi_device *sdev) WARN_ON(xa_alloc(&starget->devices, &sdev->lun_idx, sdev, scsi_lun_limit, GFP_KERNEL) < 0); } - list_add_tail(&sdev->siblings, &shost->__devices); spin_unlock_irqrestore(shost->host_lock, flags); /* * device can now only be removed via __scsi_remove_device() so hold diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 2c6b9d8bc40e..b811b5e3adfe 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -102,9 +102,6 @@ struct scsi_device { struct Scsi_Host *host; struct request_queue *request_queue; - /* the next two are protected by the host->host_lock */ - struct list_head siblings; /* list of all devices on this host */ - atomic_t device_busy; /* commands actually active on LLDD */ atomic_t device_blocked; /* Device returned QUEUE_FULL. */ @@ -376,6 +373,10 @@ extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, (sdev); \ (sdev) = __scsi_iterate_devices((shost), (sdev))) +/* only exposed to implement shost_for_each_device */ +struct scsi_device *__scsi_iterate_devices_unlocked(struct Scsi_Host *, + struct scsi_device *); + /** * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) * @sdev: the &struct scsi_device to use as a cursor @@ -389,8 +390,10 @@ extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, * device list in interrupt context. Otherwise you really want to use * shost_for_each_device instead. */ -#define __shost_for_each_device(sdev, shost) \ - list_for_each_entry((sdev), &((shost)->__devices), siblings) +#define __shost_for_each_device(sdev, shost) \ + for((sdev) = __scsi_iterate_devices_unlocked((shost), NULL); \ + (sdev); \ + (sdev) = __scsi_iterate_devices_unlocked((shost),(sdev))) extern int scsi_change_queue_depth(struct scsi_device *, int); extern int scsi_track_queue_full(struct scsi_device *, int); diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index b9395676c75b..ee0b72075e9f 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -520,9 +520,8 @@ struct Scsi_Host { * their __ prefixed variants with the lock held. NEVER * access this list directly from a driver. */ - struct list_head __devices; struct xarray __targets; - + struct list_head starved_list; spinlock_t default_lock;