From patchwork Wed Sep 22 17:34:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12511147 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 652803FCB for ; Wed, 22 Sep 2021 17:38:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=ohPa6Lwajw8vhCwLerBSIvFxJRh0fJUxeCrs38Mhz8E=; b=p7vqj/kBah76bp7Eus/YxKDd6A y1HfkQz1Yrzsf/lnZytkvzmzWXWkHpgpwsTBPEmdsEku2ZBkqpiFHCfOQphgwmal2vDhzCAHj8hy5 +YiWpjpdzeCerqNyrh217vz1NQfleiDwuqsYch4tVFHv6Ubgs/juzuhcorEU9dEaig1UqJvTOBTHk 3S+bN7RA6pUug/G93DTj03Z5FTT8ETti9kYjNBavnvXn5uMpBYPfNYuGpVwmAzVuVXkB1qG+XLh8B +1Fz8bZccV1omIRQtQ8AqJdtdxP2yaTiAXcRGZG0nwEgxIU0mcD19vwhhgkcCgMBIDghhTmERe5vV YIGssr6A==; Received: from [2001:4bb8:184:72db:3a8e:1992:6715:6960] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT6A5-004zgD-CL; Wed, 22 Sep 2021 17:36:33 +0000 From: Christoph Hellwig To: Dan Williams , Vishal Verma , Dave Jiang Cc: Mike Snitzer , Matthew Wilcox , linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, Ira Weiny Subject: [PATCH 1/3] nvdimm/pmem: fix creating the dax group Date: Wed, 22 Sep 2021 19:34:29 +0200 Message-Id: <20210922173431.2454024-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210922173431.2454024-1-hch@lst.de> References: <20210922173431.2454024-1-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html The recent block layer refactoring broke the way how the pmem driver abused device_add_disk. Fix this by properly passing the attribute groups to device_add_disk. Fixes: 52b85909f85d ("block: fold register_disk into device_add_disk") Signed-off-by: Christoph Hellwig Reviewed-by: Ira Weiny Reviewed-by: Dan Williams --- drivers/nvdimm/pmem.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 72de88ff0d30d..ef4950f808326 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -380,7 +380,6 @@ static int pmem_attach_disk(struct device *dev, struct nd_pfn_sb *pfn_sb; struct pmem_device *pmem; struct request_queue *q; - struct device *gendev; struct gendisk *disk; void *addr; int rc; @@ -489,10 +488,8 @@ static int pmem_attach_disk(struct device *dev, } dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); pmem->dax_dev = dax_dev; - gendev = disk_to_dev(disk); - gendev->groups = pmem_attribute_groups; - device_add_disk(dev, disk, NULL); + device_add_disk(dev, disk, pmem_attribute_groups); if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) return -ENOMEM; From patchwork Wed Sep 22 17:34:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12511153 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CC503FCB for ; Wed, 22 Sep 2021 17:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=07EQ1GARM0NH4DDDAVJUwgjXz6pRUEyCT4fhmlMZn+8=; b=fgPim6H9rgfuTXvAPCSvGIaavu EFVI93JzCqcP54o6GM3HwKzwlyEOvV/6YP5DGo9RmiCCddMavH9SX8+tmcnJtalusswepgQQ1VBxC ElbAucB1NE1usqMvQVAvhM53Lr9nzXnyyO9SyzpF9a8ldl6NEFyo6fheWwIbS/I+45dlTYUbA4ZC7 uz8EZ2QrYIgwpdxlNLgQe2Nro9Rk/mcpotMC00Mu9Wb8NlH9SyAsaOWkS/IiAtXtuLI7Yn8hsDDcd 0mpa/PQWVL+Tri/OEfYsDQikoDWrtgZWwPNm9FdnGfEBqIwtcUA7RmC6jpE14JFh7wBHHj8evo3Pq M1aypbdA==; Received: from [2001:4bb8:184:72db:3a8e:1992:6715:6960] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT6BK-004zkc-LL; Wed, 22 Sep 2021 17:37:36 +0000 From: Christoph Hellwig To: Dan Williams , Vishal Verma , Dave Jiang Cc: Mike Snitzer , Matthew Wilcox , linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org Subject: [PATCH 2/3] nvdimm/pmem: move dax_attribute_group from dax to pmem Date: Wed, 22 Sep 2021 19:34:30 +0200 Message-Id: <20210922173431.2454024-3-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210922173431.2454024-1-hch@lst.de> References: <20210922173431.2454024-1-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html dax_attribute_group is only used by the pmem driver, and can avoid the completely pointless lookup by the disk name if moved there. This leaves just a single caller of dax_get_by_host, so move dax_get_by_host into the same ifdef block as that caller. Signed-off-by: Christoph Hellwig Reviewed-by: Dan Williams --- drivers/dax/super.c | 100 ++++++++---------------------------------- drivers/nvdimm/pmem.c | 43 ++++++++++++++++++ include/linux/dax.h | 2 - 3 files changed, 61 insertions(+), 84 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index fc89e91beea7c..b882cf8106ea3 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -63,6 +63,24 @@ static int dax_host_hash(const char *host) return hashlen_hash(hashlen_string("DAX", host)) % DAX_HASH_SIZE; } +#ifdef CONFIG_BLOCK +#include + +int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, + pgoff_t *pgoff) +{ + sector_t start_sect = bdev ? get_start_sect(bdev) : 0; + phys_addr_t phys_off = (start_sect + sector) * 512; + + if (pgoff) + *pgoff = PHYS_PFN(phys_off); + if (phys_off % PAGE_SIZE || size % PAGE_SIZE) + return -EINVAL; + return 0; +} +EXPORT_SYMBOL(bdev_dax_pgoff); + +#if IS_ENABLED(CONFIG_FS_DAX) /** * dax_get_by_host() - temporary lookup mechanism for filesystem-dax * @host: alternate name for the device registered by a dax driver @@ -94,24 +112,6 @@ static struct dax_device *dax_get_by_host(const char *host) return found; } -#ifdef CONFIG_BLOCK -#include - -int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, - pgoff_t *pgoff) -{ - sector_t start_sect = bdev ? get_start_sect(bdev) : 0; - phys_addr_t phys_off = (start_sect + sector) * 512; - - if (pgoff) - *pgoff = PHYS_PFN(phys_off); - if (phys_off % PAGE_SIZE || size % PAGE_SIZE) - return -EINVAL; - return 0; -} -EXPORT_SYMBOL(bdev_dax_pgoff); - -#if IS_ENABLED(CONFIG_FS_DAX) struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) { if (!blk_queue_dax(bdev->bd_disk->queue)) @@ -231,70 +231,6 @@ enum dax_device_flags { DAXDEV_SYNC, }; -static ssize_t write_cache_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct dax_device *dax_dev = dax_get_by_host(dev_name(dev)); - ssize_t rc; - - WARN_ON_ONCE(!dax_dev); - if (!dax_dev) - return -ENXIO; - - rc = sprintf(buf, "%d\n", !!dax_write_cache_enabled(dax_dev)); - put_dax(dax_dev); - return rc; -} - -static ssize_t write_cache_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t len) -{ - bool write_cache; - int rc = strtobool(buf, &write_cache); - struct dax_device *dax_dev = dax_get_by_host(dev_name(dev)); - - WARN_ON_ONCE(!dax_dev); - if (!dax_dev) - return -ENXIO; - - if (rc) - len = rc; - else - dax_write_cache(dax_dev, write_cache); - - put_dax(dax_dev); - return len; -} -static DEVICE_ATTR_RW(write_cache); - -static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n) -{ - struct device *dev = container_of(kobj, typeof(*dev), kobj); - struct dax_device *dax_dev = dax_get_by_host(dev_name(dev)); - - WARN_ON_ONCE(!dax_dev); - if (!dax_dev) - return 0; - -#ifndef CONFIG_ARCH_HAS_PMEM_API - if (a == &dev_attr_write_cache.attr) - return 0; -#endif - return a->mode; -} - -static struct attribute *dax_attributes[] = { - &dev_attr_write_cache.attr, - NULL, -}; - -struct attribute_group dax_attribute_group = { - .name = "dax", - .attrs = dax_attributes, - .is_visible = dax_visible, -}; -EXPORT_SYMBOL_GPL(dax_attribute_group); - /** * dax_direct_access() - translate a device pgoff to an absolute pfn * @dax_dev: a dax_device instance representing the logical memory range diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index ef4950f808326..bbeb3f46db157 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -328,6 +328,49 @@ static const struct dax_operations pmem_dax_ops = { .zero_page_range = pmem_dax_zero_page_range, }; +static ssize_t write_cache_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pmem_device *pmem = dev_to_disk(dev)->private_data; + + return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev)); +} + +static ssize_t write_cache_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct pmem_device *pmem = dev_to_disk(dev)->private_data; + bool write_cache; + int rc; + + rc = strtobool(buf, &write_cache); + if (rc) + return rc; + dax_write_cache(pmem->dax_dev, write_cache); + return len; +} +static DEVICE_ATTR_RW(write_cache); + +static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n) +{ +#ifndef CONFIG_ARCH_HAS_PMEM_API + if (a == &dev_attr_write_cache.attr) + return 0; +#endif + return a->mode; +} + +static struct attribute *dax_attributes[] = { + &dev_attr_write_cache.attr, + NULL, +}; + +static const struct attribute_group dax_attribute_group = { + .name = "dax", + .attrs = dax_attributes, + .is_visible = dax_visible, +}; + static const struct attribute_group *pmem_attribute_groups[] = { &dax_attribute_group, NULL, diff --git a/include/linux/dax.h b/include/linux/dax.h index 2619d94c308d4..8623caa673889 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -38,8 +38,6 @@ struct dax_operations { int (*zero_page_range)(struct dax_device *, pgoff_t, size_t); }; -extern struct attribute_group dax_attribute_group; - #if IS_ENABLED(CONFIG_DAX) struct dax_device *alloc_dax(void *private, const char *host, const struct dax_operations *ops, unsigned long flags); From patchwork Wed Sep 22 17:34:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12511155 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BEDA93FCB for ; Wed, 22 Sep 2021 17:41:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=P+wjbvfBuWtk4jFuBJ3sMrPTDi2tE+fy+MjarlqPFEo=; b=PRTLrJ8GeVU08BcQhuqfpDn4ss rYH1WcFN/58h3Zl2rpjfOXvUBjxpHTa/AKrLeo5x/P7UMoel4SmsBgqLGPjoi6mngTPMjKCi8FbAk QptNsKd1mQmSdLKsMB1YmrPbIGrkff9CIJl9B+5wEXfwj0He8D9G0/+tV5N9ZlPoy+YeGFNhLRwXC 6Gthxro7CPpER+XH28Cu+Mrwe8jCV2zlhlEsZSG+GuQmJI1qdg5AQ8GMazFbkHoi7gE9lKEkldrrT YCg2L1sY8IGlWW43JHcJ/WhL/zJEYDLjajT7Nat5YvFOVNK1SBxPQ9mwGUMCuG6MxURTeVJ6zpG/c Q8Bgeh1w==; Received: from [2001:4bb8:184:72db:3a8e:1992:6715:6960] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mT6CZ-004zmi-KD; Wed, 22 Sep 2021 17:39:08 +0000 From: Christoph Hellwig To: Dan Williams , Vishal Verma , Dave Jiang Cc: Mike Snitzer , Matthew Wilcox , linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, Ira Weiny Subject: [PATCH 3/3] block: warn if ->groups is set when calling add_disk Date: Wed, 22 Sep 2021 19:34:31 +0200 Message-Id: <20210922173431.2454024-4-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210922173431.2454024-1-hch@lst.de> References: <20210922173431.2454024-1-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html The proper API is to pass the groups to device_add_disk, but the code used to also allow groups being set before calling *add_disk. Warn about that but keep the group pointer intact for now so that it can be removed again after a grace period. Fixes: 52b85909f85d ("block: fold register_disk into device_add_disk") Signed-off-by: Christoph Hellwig Reviewed-by: Ira Weiny Reviewed-by: Dan Williams --- block/genhd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/genhd.c b/block/genhd.c index 7b6e5e1cf9564..409cf608cc5bd 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -439,7 +439,8 @@ int device_add_disk(struct device *parent, struct gendisk *disk, dev_set_uevent_suppress(ddev, 1); ddev->parent = parent; - ddev->groups = groups; + if (!WARN_ON_ONCE(ddev->groups)) + ddev->groups = groups; dev_set_name(ddev, "%s", disk->disk_name); if (!(disk->flags & GENHD_FL_HIDDEN)) ddev->devt = MKDEV(disk->major, disk->first_minor);