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From: Stefan Roesch <[email protected]>
To: Jan Kara <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected]
Subject: Re: [RFC PATCH v2 04/16] iomap: add async buffered write support
Date: Wed, 18 May 2022 16:19:36 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>



On 5/17/22 4:14 AM, Jan Kara wrote:
> On Mon 16-05-22 09:47:06, Stefan Roesch wrote:
>> This adds async buffered write support to iomap. The support is focused
>> on the changes necessary to support XFS with iomap.
>>
>> Support for other filesystems might require additional changes.
>>
>> Signed-off-by: Stefan Roesch <[email protected]>
>> ---
>>  fs/iomap/buffered-io.c | 21 ++++++++++++++++++++-
>>  1 file changed, 20 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
>> index 1ffdc7078e7d..ceb3091f94c2 100644
>> --- a/fs/iomap/buffered-io.c
>> +++ b/fs/iomap/buffered-io.c
>> @@ -580,13 +580,20 @@ static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
>>  	size_t from = offset_in_folio(folio, pos), to = from + len;
>>  	size_t poff, plen;
>>  	gfp_t  gfp = GFP_NOFS | __GFP_NOFAIL;
>> +	bool no_wait = (iter->flags & IOMAP_NOWAIT);
>> +
>> +	if (no_wait)
>> +		gfp = GFP_NOIO;
> 
> GFP_NOIO means that direct reclaim is still allowed. Not sure whether you
> want to enter direct reclaim from io_uring fast path because in theory that
> can still sleep. GFP_NOWAIT would be a more natural choice...

I'll change it to GFP_NOWAIT in the next version of the patch series.
> 
> 								Honza

  reply	other threads:[~2022-05-18 23:19 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-16 16:47 [RFC PATCH v2 00/16] io-uring/xfs: support async buffered writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 01/16] block: add check for async buffered writes to generic_write_checks Stefan Roesch
2022-05-16 23:43   ` Matthew Wilcox
2022-05-18 23:20     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 02/16] iomap: add iomap_page_create_gfp to allocate iomap_pages Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 03/16] iomap: use iomap_page_create_gfp() in __iomap_write_begin Stefan Roesch
2022-05-16 23:58   ` Matthew Wilcox
2022-05-18 23:21     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 04/16] iomap: add async buffered write support Stefan Roesch
2022-05-17 11:14   ` Jan Kara
2022-05-18 23:19     ` Stefan Roesch [this message]
2022-05-16 16:47 ` [RFC PATCH v2 05/16] xfs: add iomap " Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 06/16] fs: split off need_remove_file_privs() do_remove_file_privs() Stefan Roesch
2022-05-17 13:18   ` Christian Brauner
2022-05-18 23:25     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 07/16] fs: split off need_file_update_time and do_file_update_time Stefan Roesch
2022-05-17 11:20   ` Jan Kara
2022-05-18 23:21     ` Stefan Roesch
2022-05-17 13:40   ` Christian Brauner
2022-05-18 23:28     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 08/16] fs: add pending file update time flag Stefan Roesch
2022-05-17 11:28   ` Jan Kara
2022-05-17 13:48     ` Christian Brauner
2022-05-18 23:23     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 09/16] xfs: enable async write file modification handling Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 10/16] xfs: add async buffered write support Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 11/16] io_uring: add support for async buffered writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 12/16] mm: factor out _balance_dirty_pages() from balance_dirty_pages() Stefan Roesch
2022-05-18 11:07   ` Jan Kara
2022-05-18 23:31     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 13/16] mm: add balance_dirty_pages_ratelimited_flags() function Stefan Roesch
2022-05-17 20:12   ` Jan Kara
2022-05-18 23:29     ` Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 14/16] iomap: use balance_dirty_pages_ratelimited_flags in iomap_write_iter Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 15/16] io_uring: add tracepoint for short writes Stefan Roesch
2022-05-16 16:47 ` [RFC PATCH v2 16/16] xfs: enable async buffered write support Stefan Roesch

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