Linux-ACPI Archive on lore.kernel.org
 help / color / Atom feed
From: Pankaj Gupta <pagupta@redhat.com>
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
Cc: dan.j.williams@intel.com, zwisler@kernel.org,
	vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com,
	jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net,
	hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu,
	adilger.kernel@dilger.ca, darrick.wong@oracle.com,
	lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com,
	jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com,
	stefanha@redhat.com, aarcange@redhat.com, david@redhat.com,
	david@fromorbit.com, cohuck@redhat.com,
	xiaoguangrong.eric@gmail.com, pbonzini@redhat.com,
	yuval.shaia@oracle.com, kilobyte@angband.pl, jstaron@google.com,
	rdunlap@infradead.org, snitzer@redhat.com, pagupta@redhat.com
Subject: [PATCH v11 3/7] libnvdimm: add dax_dev sync flag
Date: Mon, 10 Jun 2019 14:37:26 +0530
Message-ID: <20190610090730.8589-4-pagupta@redhat.com> (raw)
In-Reply-To: <20190610090730.8589-1-pagupta@redhat.com>

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 <pagupta@redhat.com>
---
 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 +++++++
 include/linux/dax.h          |  9 +++++++--
 include/linux/libnvdimm.h    |  1 +
 7 files changed, 40 insertions(+), 6 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 bbd57ca0634a..93b3718b5cfa 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -186,6 +186,8 @@ 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,
 };
 
 /**
@@ -354,6 +356,18 @@ 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);
@@ -508,7 +522,7 @@ 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;
@@ -531,6 +545,9 @@ 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 1fb1333fefec..7eee7ddc73a8 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1970,7 +1970,8 @@ 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 0279eb1da3ef..bdbd2b414d3d 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -365,6 +365,7 @@ 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)
@@ -462,7 +463,9 @@ 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 b4ef7d9ff22e..f3ea5369d20a 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -1197,6 +1197,13 @@ 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/include/linux/dax.h b/include/linux/dax.h
index 0dd316a74a29..2b106752b1b8 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -7,6 +7,9 @@
 #include <linux/radix-tree.h>
 #include <asm/pgtable.h>
 
+/* Flag for synchronous flush */
+#define DAXDEV_F_SYNC (1UL << 0)
+
 typedef unsigned long dax_entry_t;
 
 struct iomap_ops;
@@ -32,18 +35,20 @@ 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);
+void set_dax_synchronous(struct dax_device *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
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index feb342d026f2..3238a206e563 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -264,6 +264,7 @@ void 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)
-- 
2.20.1


  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10  9:07 [PATCH v11 0/7] virtio pmem driver Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 1/7] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 2/7] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-06-10  9:07 ` Pankaj Gupta [this message]
2019-06-10  9:07 ` [PATCH v11 4/7] dm: enable synchronous dax Pankaj Gupta
2019-06-10 19:28   ` Mike Snitzer
2019-06-11 13:10     ` [Qemu-devel] " Pankaj Gupta
2019-06-11 15:04       ` Mike Snitzer
2019-06-11 16:04         ` [Qemu-devel] " Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 5/7] dax: check synchronous mapping is supported Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 6/7] ext4: disable map_sync for async flush Pankaj Gupta
2019-06-10  9:07 ` [PATCH v11 7/7] xfs: " Pankaj Gupta

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190610090730.8589-4-pagupta@redhat.com \
    --to=pagupta@redhat.com \
    --cc=aarcange@redhat.com \
    --cc=adilger.kernel@dilger.ca \
    --cc=cohuck@redhat.com \
    --cc=dan.j.williams@intel.com \
    --cc=darrick.wong@oracle.com \
    --cc=dave.jiang@intel.com \
    --cc=david@fromorbit.com \
    --cc=david@redhat.com \
    --cc=dm-devel@redhat.com \
    --cc=hch@infradead.org \
    --cc=imammedo@redhat.com \
    --cc=jack@suse.cz \
    --cc=jasowang@redhat.com \
    --cc=jmoyer@redhat.com \
    --cc=jstaron@google.com \
    --cc=kilobyte@angband.pl \
    --cc=kvm@vger.kernel.org \
    --cc=kwolf@redhat.com \
    --cc=lcapitulino@redhat.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-ext4@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=mst@redhat.com \
    --cc=nilal@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=qemu-devel@nongnu.org \
    --cc=rdunlap@infradead.org \
    --cc=riel@surriel.com \
    --cc=rjw@rjwysocki.net \
    --cc=snitzer@redhat.com \
    --cc=stefanha@redhat.com \
    --cc=tytso@mit.edu \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=vishal.l.verma@intel.com \
    --cc=willy@infradead.org \
    --cc=xiaoguangrong.eric@gmail.com \
    --cc=yuval.shaia@oracle.com \
    --cc=zwisler@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ACPI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-acpi/0 linux-acpi/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-acpi linux-acpi/ https://lore.kernel.org/linux-acpi \
		linux-acpi@vger.kernel.org linux-acpi@archiver.kernel.org
	public-inbox-index linux-acpi


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-acpi


AGPL code for this site: git clone https://public-inbox.org/ public-inbox