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From: Dan Williams <dan.j.williams@intel.com>
To: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Matthew Wilcox <mawilcox@microsoft.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>, Jan Kara <jack@suse.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] fs: dax: Adding new return type vm_fault_t
Date: Sat, 21 Apr 2018 16:56:56 -0700	[thread overview]
Message-ID: <CAPcyv4jzyofOTrymiQchXyRdNPZ+BXn3-W3hjCJ4mvtpDD2g4w@mail.gmail.com> (raw)
In-Reply-To: <CAFqt6zZoU0O_w6stq+47ndBUY+yqk950nsyP_1ShTArQfxsSeQ@mail.gmail.com>

On Sat, Apr 21, 2018 at 2:54 PM, Souptick Joarder <jrdr.linux@gmail.com> wrote:
> On Sun, Apr 22, 2018 at 3:04 AM, Matthew Wilcox <willy@infradead.org> wrote:
>> On Sun, Apr 22, 2018 at 02:35:29AM +0530, Souptick Joarder wrote:
>>> Use new return type vm_fault_t for fault handler. For
>>> now, this is just documenting that the function returns
>>> a VM_FAULT value rather than an errno. Once all instances
>>> are converted, vm_fault_t will become a distinct type.
>>>
>>> commit 1c8f422059ae ("mm: change return type to vm_fault_t")
>>>
>>> There was an existing bug inside dax_load_hole()
>>> if vm_insert_mixed had failed to allocate a page table,
>>> we'd return VM_FAULT_NOPAGE instead of VM_FAULT_OOM.
>>> With new vmf_insert_mixed() this issue is addressed.
>>>
>>> vm_insert_mixed_mkwrite has inefficiency when it returns
>>> an error value, driver has to convert it to vm_fault_t
>>> type. With new vmf_insert_mixed_mkwrite() this limitation
>>> will be addressed.
>>>
>>> As new function vmf_insert_mixed_mkwrite() only called
>>> from fs/dax.c, so keeping both the changes in a single
>>> patch.
>>>
>>> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
>>
>> Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
>>
>> There's a couple of minor things which could be tidied up, but not worth
>> doing them as a revision to this patch.
>
> Which tree this patch will go through ? mm or fsdevel ?

nvdimm, since that tree has some pending reworks for dax-vs-truncate.

  reply	other threads:[~2018-04-21 23:56 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-21 21:05 Souptick Joarder
2018-04-21 21:34 ` Matthew Wilcox
2018-04-21 21:54   ` Souptick Joarder
2018-04-21 23:56     ` Dan Williams [this message]
2018-04-22 23:09 ` Jan Kara
2018-04-23  2:25   ` Matthew Wilcox
2018-04-23 13:59     ` Jan Kara
2018-04-23 16:12       ` Souptick Joarder
2018-04-23 17:28         ` Matthew Wilcox

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