linux-kernel - Re: [PATCH 3/6] ext4: use ktime_get_real_seconds for i

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Date:   Thu, 21 Jun 2018 11:27:12 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.com>,
        y2038@...ts.linaro.org,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Jan Kara <jack@...e.cz>, Tahsin Erdogan <tahsin@...gle.com>,
        Miao Xie <miaoxie@...wei.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] ext4: use ktime_get_real_seconds for i_dtime


> On Jun 20, 2018, at 9:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> 
> We only care about the low 32-bit for i_dtime as explained in commit
> b5f515735bea ("ext4: avoid Y2038 overflow in recently_deleted()"), so
> the use of get_seconds() is correct here, but that function is getting
> removed in the process of the y2038 fixes, so let's use the modern
> ktime_get_real_seconds() here.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Looks OK, one minor cleanup possible.

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> fs/ext4/inode.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 2ea07efbe016..600e2063d1df 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -317,7 +317,7 @@ void ext4_evict_inode(struct inode *inode)
> 	 * (Well, we could do this if we need to, but heck - it works)
> 	 */
> 	ext4_orphan_del(handle, inode);
> -	EXT4_I(inode)->i_dtime	= get_seconds();
> +	EXT4_I(inode)->i_dtime	= ktime_get_real_seconds();

Not strictly necessary, but it might be good from a code clarity POV
to use:

	EXT4_I(inode)->i_dtime	= (__u32)ktime_get_real_seconds();

so that it is more clear we are aware that this is being truncated
to a 32-bit value.

Cheers, Andreas






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