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From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Toshi Kani <toshi.kani@hpe.com>
Cc: jack@suse.cz, linux-nvdimm@lists.01.org,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org
Subject: Re: [PATCH v2 2/3] ext4, dax: set ext4_dax_aops for dax files
Date: Sat, 15 Sep 2018 21:56:46 -0400	[thread overview]
Message-ID: <20180916015646.GE8652@thunk.org> (raw)
In-Reply-To: <20180914145114.11122-3-toshi.kani@hpe.com>

On Fri, Sep 14, 2018 at 08:51:13AM -0600, Toshi Kani wrote:
> Sync syscall to DAX file needs to flush processor cache, but it
> currently does not flush to existing DAX files.  This is because
> 'ext4_da_aops' is set to address_space_operations of existing DAX
> files, instead of 'ext4_dax_aops', since S_DAX flag is set after
> ext4_set_aops() in the open path.
> 
>   New file
>   --------
>   lookup_open
>     ext4_create
>       __ext4_new_inode
>         ext4_set_inode_flags   // Set S_DAX flag
>       ext4_set_aops            // Set aops to ext4_dax_aops
> 
>   Existing file
>   -------------
>   lookup_open
>     ext4_lookup
>       ext4_iget
>         ext4_set_aops          // Set aops to ext4_da_aops
>         ext4_set_inode_flags   // Set S_DAX flag
> 
> Change ext4_iget() to initialize i_flags before ext4_set_aops().
> 
> Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
> Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
> Suggested-by: Jan Kara <jack@suse.cz>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> Cc: <stable@vger.kernel.org>

Thanks, applied.

					- Ted
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  reply	other threads:[~2018-09-16  1:56 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-14 14:51 [PATCH v2 0/3] fix sync to flush processor cache for ext2/4 DAX files Toshi Kani
2018-09-14 14:51 ` [PATCH v2 1/3] ext4, dax: add ext4_bmap to ext4_dax_aops Toshi Kani
2018-09-16  1:32   ` Theodore Y. Ts'o
2018-09-14 14:51 ` [PATCH v2 2/3] ext4, dax: set ext4_dax_aops for dax files Toshi Kani
2018-09-16  1:56   ` Theodore Y. Ts'o [this message]
2018-09-14 14:51 ` [PATCH v2 3/3] ext2, dax: set ext2_dax_aops " Toshi Kani
2018-09-17 16:37   ` Jan Kara

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