Hi Darrick,
On Fri, 1 Jun 2018 17:59:48 -0700 "Darrick J. Wong" <darrick.w...@oracle.com>
wrote:
>
> > + if (!dax_enabled) {
> > - pr_debug("VFS (%s): error: dax support not enabled\n",
> > - sb->s_id);
> > + pr_debug("%s: error: dax support not enabled\n",
> > + bdevname(bdev, buf));
> > - return false;
> > + return -EOPNOTSUPP;
>
> Hang on a sec, the changes in the xfs tree make this function return a
> boolean (true for dax-is-supported, false for dax-not-supported), but
> this change partially reverts the boolean return values.
OK, weird, that is what I though I had done. Thanks for pointing it
out (I guess it was getting late :-().
> > }
> > -
> > - return true;
> > + return 0;
>
> The merge should retain the 'return false' above and the 'return true'
> here... or possibly just return dax_enabled:
>
> if (!dax_enabled) {
> pr_debug(...);
> pr_debug(...);
> }
>
> return dax_enabled;
OK, I have fixed up my merge resolution. The end of that function will
now look like this:
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) {
/*
* An arch that has enabled the pmem api should also
* have its drivers support pfn_t_devmap()
*
* This is a developer warning and should not trigger in
* production. dax_flush() will crash since it depends
* on being able to do (page_address(pfn_to_page())).
*/
WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API));
dax_enabled = true;
} else if (pfn_t_devmap(pfn)) {
struct dev_pagemap *pgmap;
pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL);
if (pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX)
dax_enabled = true;
put_dev_pagemap(pgmap);
}
if (!dax_enabled)
pr_debug("%s: error: dax support not enabled\n",
bdevname(bdev, buf));
return dax_enabled;
}
EXPORT_SYMBOL_GPL(__bdev_dax_supported);
--
Cheers,
Stephen Rothwell
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