From abebfbe2f7315dd3ec9a0c69596a76e32beb5749 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Mon, 29 May 2017 13:02:52 -0700 Subject: 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 Reviewed-by: Mike Snitzer Signed-off-by: Dan Williams --- include/linux/dax.h | 2 ++ include/linux/device-mapper.h | 3 +++ 2 files changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dax.h b/include/linux/dax.h index 407dd3ff6e54..1f6b6072af64 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -82,6 +82,8 @@ long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); +void dax_flush(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, + size_t size); /* * We use lowest available bit in exceptional entry for locking, one bit for diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 11c8a0a92f9c..67bfe8ddcb32 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -134,6 +134,8 @@ typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); typedef size_t (*dm_dax_copy_from_iter_fn)(struct dm_target *ti, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); +typedef void (*dm_dax_flush_fn)(struct dm_target *ti, pgoff_t pgoff, void *addr, + size_t size); #define PAGE_SECTORS (PAGE_SIZE / 512) void dm_error(const char *message); @@ -184,6 +186,7 @@ struct target_type { dm_io_hints_fn io_hints; dm_dax_direct_access_fn direct_access; dm_dax_copy_from_iter_fn dax_copy_from_iter; + dm_dax_flush_fn dax_flush; /* For internal device-mapper use. */ struct list_head list; -- cgit v1.2.3