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| author | Dan Williams <dan.j.williams@intel.com> | 2017-05-29 13:02:52 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-06-15 14:34:59 -0700 |
| commit | abebfbe2f7315dd3ec9a0c69596a76e32beb5749 (patch) | |
| tree | e0b8a531424d7625e19a82a9151fa64a0a30671b /drivers/dax | |
| parent | 3c1cebff23cdca01c421411e953a9e239f2b9ef9 (diff) | |
| download | linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.tar.gz linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.tar.bz2 linux-abebfbe2f7315dd3ec9a0c69596a76e32beb5749.zip | |
dm: add ->flush() dax operation support
Allow device-mapper to route flush operations to the
per-target implementation. In order for the device stacking to work we
need a dax_dev and a pgoff relative to that device. This gives each
layer of the stack the information it needs to look up the operation
pointer for the next level.
This conceptually allows for an array of mixed device drivers with
varying flush implementations.
Reviewed-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/super.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index dd299e55f65d..b7729e4d351a 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -185,6 +185,17 @@ size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, } EXPORT_SYMBOL_GPL(dax_copy_from_iter); +void dax_flush(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, + size_t size) +{ + if (!dax_alive(dax_dev)) + return; + + if (dax_dev->ops->flush) + dax_dev->ops->flush(dax_dev, pgoff, addr, size); +} +EXPORT_SYMBOL_GPL(dax_flush); + bool dax_alive(struct dax_device *dax_dev) { lockdep_assert_held(&dax_srcu); |