linux-ext4 - Re: [RFC 05/10] fs/dax: Refactor wait for dax idle page

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Date: Mon, 15 Apr 2024 18:41:51 +1000
From: Alistair Popple <apopple@...dia.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: linux-mm@...ck.org, david@...morbit.com, dan.j.williams@...el.com,
 rcampbell@...dia.com, willy@...radead.org, jgg@...dia.com,
 linux-fsdevel@...r.kernel.org, jack@...e.cz, djwong@...nel.org,
 hch@....de, david@...hat.com, ruansy.fnst@...itsu.com,
 nvdimm@...ts.linux.dev, linux-xfs@...r.kernel.org,
 linux-ext4@...r.kernel.org, jglisse@...hat.com
Subject: Re: [RFC 05/10] fs/dax: Refactor wait for dax idle page


John Hubbard <jhubbard@...dia.com> writes:

> On 4/10/24 5:57 PM, Alistair Popple wrote:
> ...
>> diff --git a/include/linux/dax.h b/include/linux/dax.h
>> index 22cd990..bced4d4 100644
>> --- a/include/linux/dax.h
>> +++ b/include/linux/dax.h
>> @@ -212,6 +212,17 @@ int dax_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero,
>>   int dax_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
>>   		const struct iomap_ops *ops);
>>   +static inline int dax_wait_page_idle(struct page *page,
>> +				void (cb)(struct inode *),
>> +				struct inode *inode)
>> +{
>> +	int ret;
>> +
>> +	ret = ___wait_var_event(page, page_ref_count(page) == 1,
>> +				TASK_INTERRUPTIBLE, 0, 0, cb(inode));
>> +	return ret;
>> +}
>
> Or just:
> {
> 	return ___wait_var_event(page, page_ref_count(page) == 1,
> 			TASK_INTERRUPTIBLE, 0, 0, cb(inode));
> }
>
> ...yes?

Yep. Thanks.

> thanks,