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dax: Move mandatory ->zero_page_range() check in alloc_dax()

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zero_page_range() dax operation is mandatory for dax devices. Right now
that check happens in dax_zero_page_range() function. Dan thinks that's
too late and its better to do the check earlier in alloc_dax().

I also modified alloc_dax() to return pointer with error code in it in
case of failure. Right now it returns NULL and caller assumes failure
happened due to -ENOMEM. But with this ->zero_page_range() check, I
need to return -EINVAL instead.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Link: https://lore.kernel.org/r/20200401161125.GB9398@redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vivek Goyal
2020-04-01 12:11:25 -04:00
committed by Dan Williams
parent 4f3b4f161d
commit 4e4ced9379
5 changed files with 18 additions and 11 deletions
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4
drivers/dax/bus.c
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@@ -421,8 +421,10 @@ struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
* device outside of mmap of the resulting character device.
*/
dax_dev = alloc_dax(dev_dax, NULL, NULL, DAXDEV_F_SYNC);
if (!dax_dev)
if (IS_ERR(dax_dev)) {
rc = PTR_ERR(dax_dev);
goto err;
}
/* a device_dax instance is dead while the driver is not attached */
kill_dax(dax_dev);