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device-dax: Add /sys/class/dax backwards compatibility

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On the expectation that some environments may not upgrade libdaxctl
(userspace component that depends on the /sys/class/dax hierarchy),
provide a default / legacy dax_pmem_compat driver. The dax_pmem_compat
driver implements the original /sys/class/dax sysfs layout rather than
/sys/bus/dax. When userspace is upgraded it can blacklist this module
and switch to the dax_pmem driver going forward.

CONFIG_DEV_DAX_PMEM_COMPAT and supporting code will be deleted according
to the dax_pmem entry in Documentation/ABI/obsolete/.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2017-07-16 13:51:53 -07:00
parent d200781ef2
commit 730926c3b0
11 changed files with 229 additions and 50 deletions
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9
drivers/dax/device.c
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@@ -445,7 +445,7 @@ static void dev_dax_kill(void *dev_dax)
kill_dev_dax(dev_dax);
}
static int dev_dax_probe(struct device *dev)
int dev_dax_probe(struct device *dev)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
struct dax_device *dax_dev = dev_dax->dax_dev;
@@ -484,7 +484,11 @@ static int dev_dax_probe(struct device *dev)
inode = dax_inode(dax_dev);
cdev = inode->i_cdev;
cdev_init(cdev, &dax_fops);
cdev->owner = dev->driver->owner;
if (dev->class) {
/* for the CONFIG_DEV_DAX_PMEM_COMPAT case */
cdev->owner = dev->parent->driver->owner;
} else
cdev->owner = dev->driver->owner;
cdev_set_parent(cdev, &dev->kobj);
rc = cdev_add(cdev, dev->devt, 1);
if (rc)
@@ -497,6 +501,7 @@ static int dev_dax_probe(struct device *dev)
run_dax(dax_dev);
return devm_add_action_or_reset(dev, dev_dax_kill, dev_dax);
}
EXPORT_SYMBOL_GPL(dev_dax_probe);
static int dev_dax_remove(struct device *dev)
{