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From: Jan Kara <[email protected]>
To: Stefan Roesch <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected]
Subject: Re: [RFC PATCH v2 08/16] fs: add pending file update time flag.
Date: Tue, 17 May 2022 13:28:16 +0200	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On Mon 16-05-22 09:47:10, Stefan Roesch wrote:
> This introduces an optimization for the update time flag and async
> buffered writes. While an update of the file modification time is
> pending and is handled by the workers, concurrent writes do not need
> to wait for this time update to complete.
> 
> Signed-off-by: Stefan Roesch <[email protected]>
> ---
>  fs/inode.c         | 1 +
>  include/linux/fs.h | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 1d0b02763e98..fd18b2c1b7c4 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -2091,6 +2091,7 @@ static int do_file_update_time(struct inode *inode, struct file *file,
>  		return 0;
>  
>  	ret = inode_update_time(inode, now, sync_mode);
> +	inode->i_flags &= ~S_PENDING_TIME;

So what protects this update of inode->i_flags? Usually we use
inode->i_rwsem for that but not all file_update_time() callers hold it...

								Honza

-- 
Jan Kara <[email protected]>
SUSE Labs, CR


  reply	other threads:[~2022-05-17 11:28 UTC|newest]

Thread overview: 22+ 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
2022-05-16 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
2022-05-16 16:47 ` [RFC PATCH v2 04/16] iomap: add async buffered write support Stefan Roesch
2022-05-17 11:14   ` Jan Kara
2022-05-16 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
2022-05-16 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
2022-05-16 16:47 ` [RFC PATCH v2 08/16] fs: add pending file update time flag Stefan Roesch
2022-05-17 11:28   ` Jan Kara [this message]
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
2022-05-16 16:47 ` [RFC PATCH v2 13/16] mm: add balance_dirty_pages_ratelimited_flags() function 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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