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Date: Wed, 13 Mar 2024 19:13:18 +0100
From: Jan Kara <jack@suse.cz>
To: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: linux-ext4@vger.kernel.org, Jan Kara <jack@suse.cz>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/2] ext4: set FMODE_CAN_ODIRECT instead of a dummy
 direct_IO method
Message-ID: <20240313181318.2blrwlbjth34ukps@quack3>
References: <e5797bb597219a49043e53e4e90aa494b97dc328.1709215665.git.ritesh.list@gmail.com>
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On Thu 29-02-24 19:54:12, Ritesh Harjani (IBM) wrote:
> From: Christoph Hellwig <hch@lst.de>
> 
> Since commit a2ad63daa88b ("VFS: add FMODE_CAN_ODIRECT file flag") file
> systems can just set the FMODE_CAN_ODIRECT flag at open time instead of
> wiring up a dummy direct_IO method to indicate support for direct I/O.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> [RH: Rebased to upstream]
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>

Looks good! Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
> Stumbled upon [1], while I was trying to enable this flag in ext4_file_open().
> Looks like it might have slipped through the cracks.
> Hence sending this patch with Christoph as the author.
> [1]: https://lore.kernel.org/linux-ext4/20230612053731.585947-1-hch@lst.de/
> 
>  fs/ext4/file.c  | 2 +-
>  fs/ext4/inode.c | 4 ----
>  2 files changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 54d6ff22585c..965febab1d04 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -886,7 +886,7 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
>  	}
>  
>  	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC |
> -			FMODE_DIO_PARALLEL_WRITE;
> +			FMODE_DIO_PARALLEL_WRITE | FMODE_CAN_ODIRECT;
>  	return dquot_file_open(inode, filp);
>  }
>  
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 2ccf3b5e3a7c..60a03b2ca178 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3530,7 +3530,6 @@ static const struct address_space_operations ext4_aops = {
>  	.bmap			= ext4_bmap,
>  	.invalidate_folio	= ext4_invalidate_folio,
>  	.release_folio		= ext4_release_folio,
> -	.direct_IO		= noop_direct_IO,
>  	.migrate_folio		= buffer_migrate_folio,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
>  	.error_remove_folio	= generic_error_remove_folio,
> @@ -3547,7 +3546,6 @@ static const struct address_space_operations ext4_journalled_aops = {
>  	.bmap			= ext4_bmap,
>  	.invalidate_folio	= ext4_journalled_invalidate_folio,
>  	.release_folio		= ext4_release_folio,
> -	.direct_IO		= noop_direct_IO,
>  	.migrate_folio		= buffer_migrate_folio_norefs,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
>  	.error_remove_folio	= generic_error_remove_folio,
> @@ -3564,7 +3562,6 @@ static const struct address_space_operations ext4_da_aops = {
>  	.bmap			= ext4_bmap,
>  	.invalidate_folio	= ext4_invalidate_folio,
>  	.release_folio		= ext4_release_folio,
> -	.direct_IO		= noop_direct_IO,
>  	.migrate_folio		= buffer_migrate_folio,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
>  	.error_remove_folio	= generic_error_remove_folio,
> @@ -3573,7 +3570,6 @@ static const struct address_space_operations ext4_da_aops = {
>  
>  static const struct address_space_operations ext4_dax_aops = {
>  	.writepages		= ext4_dax_writepages,
> -	.direct_IO		= noop_direct_IO,
>  	.dirty_folio		= noop_dirty_folio,
>  	.bmap			= ext4_bmap,
>  	.swap_activate		= ext4_iomap_swap_activate,
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR