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| author | Dan Williams <dan.j.williams@intel.com> | 2017-04-11 09:49:49 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-04-12 21:59:14 -0700 |
| commit | 7b6be8444e0f0dd675b54d059793423d3c9b4c03 (patch) | |
| tree | b2782a46dda7b03fac23216f873b1a6bf1df58cb /tools/testing/nvdimm | |
| parent | 5f0694b300b9fb8409272c550418c22e0e57314a (diff) | |
| download | linux-7b6be8444e0f0dd675b54d059793423d3c9b4c03.tar.bz2 | |
dax: refactor dax-fs into a generic provider of 'struct dax_device' instances
We want dax capable drivers to be able to publish a set of dax
operations [1]. However, we do not want to further abuse block_devices
to advertise these operations. Instead we will attach these operations
to a dax device and add a lookup mechanism to go from block device path
to a dax device. A dax capable driver like pmem or brd is responsible
for registering a dax device, alongside a block device, and then a dax
capable filesystem is responsible for retrieving the dax device by path
name if it wants to call dax_operations.
For now, we refactor the dax pseudo-fs to be a generic facility, rather
than an implementation detail, of the device-dax use case. Where a "dax
device" is just an inode + dax infrastructure, and "Device DAX" is a
mapping service layered on top of that base 'struct dax_device'.
"Filesystem DAX" is then a mapping service that layers a filesystem on
top of that same base device. Filesystem DAX is associated with a
block_device for now, but perhaps directly to a dax device in the
future, or for new pmem-only filesystems.
[1]: https://lkml.org/lkml/2017/1/19/880
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'tools/testing/nvdimm')
| -rw-r--r-- | tools/testing/nvdimm/Kbuild | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild index 405212be044a..2033ad03b8cd 100644 --- a/tools/testing/nvdimm/Kbuild +++ b/tools/testing/nvdimm/Kbuild @@ -28,7 +28,10 @@ obj-$(CONFIG_ND_BTT) += nd_btt.o obj-$(CONFIG_ND_BLK) += nd_blk.o obj-$(CONFIG_X86_PMEM_LEGACY) += nd_e820.o obj-$(CONFIG_ACPI_NFIT) += nfit.o -obj-$(CONFIG_DEV_DAX) += dax.o +ifeq ($(CONFIG_DAX),m) +obj-$(CONFIG_DAX) += dax.o +endif +obj-$(CONFIG_DEV_DAX) += device_dax.o obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem.o nfit-y := $(ACPI_SRC)/core.o @@ -48,9 +51,12 @@ nd_blk-y += config_check.o nd_e820-y := $(NVDIMM_SRC)/e820.o nd_e820-y += config_check.o -dax-y := $(DAX_SRC)/dax.o +dax-y := $(DAX_SRC)/super.o dax-y += config_check.o +device_dax-y := $(DAX_SRC)/device.o +device_dax-y += config_check.o + dax_pmem-y := $(DAX_SRC)/pmem.o dax_pmem-y += config_check.o |