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Date: Fri, 21 Jun 2019 19:04:51 +0530
From: Pankaj Gupta <pagupta@...hat.com>
To: dm-devel@...hat.com, linux-nvdimm@...ts.01.org,
linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-acpi@...r.kernel.org,
qemu-devel@...gnu.org, linux-ext4@...r.kernel.org,
linux-xfs@...r.kernel.org
Cc: dan.j.williams@...el.com, zwisler@...nel.org,
vishal.l.verma@...el.com, dave.jiang@...el.com, mst@...hat.com,
jasowang@...hat.com, willy@...radead.org, rjw@...ysocki.net,
hch@...radead.org, lenb@...nel.org, jack@...e.cz, tytso@....edu,
adilger.kernel@...ger.ca, darrick.wong@...cle.com,
lcapitulino@...hat.com, kwolf@...hat.com, imammedo@...hat.com,
jmoyer@...hat.com, nilal@...hat.com, riel@...riel.com,
stefanha@...hat.com, aarcange@...hat.com, david@...hat.com,
david@...morbit.com, cohuck@...hat.com,
xiaoguangrong.eric@...il.com, pagupta@...hat.com,
pbonzini@...hat.com, yuval.shaia@...cle.com, kilobyte@...band.pl,
jstaron@...gle.com, rdunlap@...radead.org, snitzer@...hat.com
Subject: [PATCH v14 3/7] libnvdimm: add dax_dev sync flag
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@...hat.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 +++++++
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 <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;
@@ -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)
--
2.20.1
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