diff options
| author | Pankaj Gupta <pagupta@redhat.com> | 2019-07-05 17:03:24 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-07-06 01:19:10 +0300 |
| commit | fefc1d97fa4b5e016bbe15447dc3edcd9e1bcb9f (patch) | |
| tree | f18d110c2fdc771ca69ea6a83399f0c13f758664 /drivers/dax | |
| parent | 6e84200c0a2994b991259d19450eee561029bf70 (diff) | |
| download | linux-fefc1d97fa4b5e016bbe15447dc3edcd9e1bcb9f.tar.xz | |
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@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/bus.c | 2 | ||||
| -rw-r--r-- | drivers/dax/super.c | 19 |
2 files changed, 19 insertions, 2 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: |