From patchwork Fri Jun 21 13:34:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 11010139 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A088D1580 for ; Fri, 21 Jun 2019 13:44:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 901F028B03 for ; Fri, 21 Jun 2019 13:44:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8382828AE8; Fri, 21 Jun 2019 13:44:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E45BD28AEC for ; Fri, 21 Jun 2019 13:44:08 +0000 (UTC) Received: from localhost ([::1]:35124 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1heJpn-0007Jg-E1 for patchwork-qemu-devel@patchwork.kernel.org; Fri, 21 Jun 2019 09:44:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54763) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1heJkE-00034f-Mi for qemu-devel@nongnu.org; Fri, 21 Jun 2019 09:38:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1heJkD-0002rX-3g for qemu-devel@nongnu.org; Fri, 21 Jun 2019 09:38:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52910) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1heJkC-0002qA-TC for qemu-devel@nongnu.org; Fri, 21 Jun 2019 09:38:21 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7D3DE3097032; Fri, 21 Jun 2019 13:38:08 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (ovpn-116-60.sin2.redhat.com [10.67.116.60]) by smtp.corp.redhat.com (Postfix) with ESMTP id 05EE95B689; Fri, 21 Jun 2019 13:37:33 +0000 (UTC) From: Pankaj Gupta To: dm-devel@redhat.com, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org, qemu-devel@nongnu.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org Date: Fri, 21 Jun 2019 19:04:51 +0530 Message-Id: <20190621133455.3303-4-pagupta@redhat.com> In-Reply-To: <20190621133455.3303-1-pagupta@redhat.com> References: <20190621133455.3303-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Fri, 21 Jun 2019 13:38:13 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v14 3/7] libnvdimm: add dax_dev sync flag X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pagupta@redhat.com, rdunlap@infradead.org, jack@suse.cz, snitzer@redhat.com, mst@redhat.com, jasowang@redhat.com, david@fromorbit.com, lcapitulino@redhat.com, adilger.kernel@dilger.ca, zwisler@kernel.org, aarcange@redhat.com, dave.jiang@intel.com, jstaron@google.com, darrick.wong@oracle.com, vishal.l.verma@intel.com, david@redhat.com, willy@infradead.org, hch@infradead.org, jmoyer@redhat.com, nilal@redhat.com, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval.shaia@oracle.com, stefanha@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, kwolf@redhat.com, tytso@mit.edu, xiaoguangrong.eric@gmail.com, cohuck@redhat.com, rjw@rjwysocki.net, imammedo@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This patch adds 'DAXDEV_SYNC' flag which is set for nd_region doing synchronous flush. This later is used to disable MAP_SYNC functionality for ext4 & xfs filesystem for devices don't support synchronous flush. Signed-off-by: Pankaj Gupta --- drivers/dax/bus.c | 2 +- drivers/dax/super.c | 19 ++++++++++++++++++- drivers/md/dm.c | 3 ++- drivers/nvdimm/pmem.c | 5 ++++- drivers/nvdimm/region_devs.c | 7 +++++++ drivers/s390/block/dcssblk.c | 2 +- include/linux/dax.h | 24 ++++++++++++++++++++++-- include/linux/libnvdimm.h | 1 + 8 files changed, 56 insertions(+), 7 deletions(-) diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c index 2109cfe80219..5f184e751c82 100644 --- a/drivers/dax/bus.c +++ b/drivers/dax/bus.c @@ -388,7 +388,7 @@ struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id, * No 'host' or dax_operations since there is no access to this * device outside of mmap of the resulting character device. */ - dax_dev = alloc_dax(dev_dax, NULL, NULL); + dax_dev = alloc_dax(dev_dax, NULL, NULL, DAXDEV_F_SYNC); if (!dax_dev) goto err; diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 4e5ae7e8b557..8ab12068eea3 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -195,6 +195,8 @@ enum dax_device_flags { DAXDEV_ALIVE, /* gate whether dax_flush() calls the low level flush routine */ DAXDEV_WRITE_CACHE, + /* flag to check if device supports synchronous flush */ + DAXDEV_SYNC, }; /** @@ -372,6 +374,18 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev) } EXPORT_SYMBOL_GPL(dax_write_cache_enabled); +bool __dax_synchronous(struct dax_device *dax_dev) +{ + return test_bit(DAXDEV_SYNC, &dax_dev->flags); +} +EXPORT_SYMBOL_GPL(__dax_synchronous); + +void __set_dax_synchronous(struct dax_device *dax_dev) +{ + set_bit(DAXDEV_SYNC, &dax_dev->flags); +} +EXPORT_SYMBOL_GPL(__set_dax_synchronous); + bool dax_alive(struct dax_device *dax_dev) { lockdep_assert_held(&dax_srcu); @@ -526,7 +540,7 @@ static void dax_add_host(struct dax_device *dax_dev, const char *host) } struct dax_device *alloc_dax(void *private, const char *__host, - const struct dax_operations *ops) + const struct dax_operations *ops, unsigned long flags) { struct dax_device *dax_dev; const char *host; @@ -549,6 +563,9 @@ struct dax_device *alloc_dax(void *private, const char *__host, dax_add_host(dax_dev, host); dax_dev->ops = ops; dax_dev->private = private; + if (flags & DAXDEV_F_SYNC) + set_dax_synchronous(dax_dev); + return dax_dev; err_dev: diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 5475081dcbd6..b1caa7188209 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1991,7 +1991,8 @@ static struct mapped_device *alloc_dev(int minor) sprintf(md->disk->disk_name, "dm-%d", minor); if (IS_ENABLED(CONFIG_DAX_DRIVER)) { - md->dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops); + md->dax_dev = alloc_dax(md, md->disk->disk_name, + &dm_dax_ops, 0); if (!md->dax_dev) goto bad; } diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 223da63d1bd7..8be868e2a18b 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -376,6 +376,7 @@ static int pmem_attach_disk(struct device *dev, struct gendisk *disk; void *addr; int rc; + unsigned long flags = 0UL; pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); if (!pmem) @@ -474,7 +475,9 @@ static int pmem_attach_disk(struct device *dev, nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res); disk->bb = &pmem->bb; - dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops); + if (is_nvdimm_sync(nd_region)) + flags = DAXDEV_F_SYNC; + dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags); if (!dax_dev) { put_disk(disk); return -ENOMEM; diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index eca2e62af134..56f2227f192a 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1211,6 +1211,13 @@ int nvdimm_has_cache(struct nd_region *nd_region) } EXPORT_SYMBOL_GPL(nvdimm_has_cache); +bool is_nvdimm_sync(struct nd_region *nd_region) +{ + return is_nd_pmem(&nd_region->dev) && + !test_bit(ND_REGION_ASYNC, &nd_region->flags); +} +EXPORT_SYMBOL_GPL(is_nvdimm_sync); + struct conflict_context { struct nd_region *nd_region; resource_size_t start, size; diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index d04d4378ca50..63502ca537eb 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -679,7 +679,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char goto put_dev; dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, - &dcssblk_dax_ops); + &dcssblk_dax_ops, DAXDEV_F_SYNC); if (!dev_info->dax_dev) { rc = -ENOMEM; goto put_dev; diff --git a/include/linux/dax.h b/include/linux/dax.h index becaea5f4488..8b535bc4526f 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -7,6 +7,9 @@ #include #include +/* Flag for synchronous flush */ +#define DAXDEV_F_SYNC (1UL << 0) + typedef unsigned long dax_entry_t; struct iomap_ops; @@ -38,18 +41,28 @@ extern struct attribute_group dax_attribute_group; #if IS_ENABLED(CONFIG_DAX) struct dax_device *dax_get_by_host(const char *host); struct dax_device *alloc_dax(void *private, const char *host, - const struct dax_operations *ops); + const struct dax_operations *ops, unsigned long flags); void put_dax(struct dax_device *dax_dev); void kill_dax(struct dax_device *dax_dev); void dax_write_cache(struct dax_device *dax_dev, bool wc); bool dax_write_cache_enabled(struct dax_device *dax_dev); +bool __dax_synchronous(struct dax_device *dax_dev); +static inline bool dax_synchronous(struct dax_device *dax_dev) +{ + return __dax_synchronous(dax_dev); +} +void __set_dax_synchronous(struct dax_device *dax_dev); +static inline void set_dax_synchronous(struct dax_device *dax_dev) +{ + __set_dax_synchronous(dax_dev); +} #else static inline struct dax_device *dax_get_by_host(const char *host) { return NULL; } static inline struct dax_device *alloc_dax(void *private, const char *host, - const struct dax_operations *ops) + const struct dax_operations *ops, unsigned long flags) { /* * Callers should check IS_ENABLED(CONFIG_DAX) to know if this @@ -70,6 +83,13 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) { return false; } +static inline bool dax_synchronous(struct dax_device *dax_dev) +{ + return true; +} +static inline void set_dax_synchronous(struct dax_device *dax_dev) +{ +} #endif struct writeback_control; diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index e13100f424c8..7a64b3ddb408 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -263,6 +263,7 @@ int generic_nvdimm_flush(struct nd_region *nd_region); int nvdimm_has_flush(struct nd_region *nd_region); int nvdimm_has_cache(struct nd_region *nd_region); int nvdimm_in_overwrite(struct nvdimm *nvdimm); +bool is_nvdimm_sync(struct nd_region *nd_region); static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)