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| author |   Dan Williams <dan.j.williams@intel.com> | 2017-01-24 18:44:18 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-04-19 15:14:35 -0700 |
| commit | 6568b08b77816cda2a95919c7494108d983d5941 (patch) | |
| tree | cdc776afdf8dd6c583155d169017eb78ab94a8bf /drivers/dax/device.c | |
| parent | dax: add a facility to lookup a dax device by 'host' device name (diff) | |
| download | linux-dev-6568b08b77816cda2a95919c7494108d983d5941.tar.xz linux-dev-6568b08b77816cda2a95919c7494108d983d5941.zip | |
dax: introduce dax_operations
Track a set of dax_operations per dax_device that can be set at
alloc_dax() time. These operations will be used to stop the abuse of
block_device_operations for communicating dax capabilities to
filesystems. It will also be used to replace the "pmem api" and move
pmem-specific cache maintenance, and other dax-driver-specific
filesystem-dax operations, to dax device methods. In particular this
allows us to stop abusing __copy_user_nocache(), via memcpy_to_pmem(),
with a driver specific replacement.
This is a standalone introduction of the operations. Follow on patches
convert each dax-driver and teach fs/dax.c to use ->direct_access() from
dax_operations instead of block_device_operations.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/device.c')
| -rw-r--r-- | drivers/dax/device.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index db68f4fa8ce0..a0db055054a4 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -645,7 +645,11 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, goto err_id; } - dax_dev = alloc_dax(dev_dax, NULL); + /* + * 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); if (!dax_dev) goto err_dax; |