linux-kernel - Re: [PATCH v2 08/24] fs: btrfs: Use ktime_get_real

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Date:	Mon, 20 Jun 2016 11:46:09 +0200
From:	David Sterba <dsterba@...e.cz>
To:	Deepa Dinamani <deepa.kernel@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, tglx@...utronix.de, torvalds@...ux-foundation.org,
	tytso@....edu, viro@...iv.linux.org.uk, y2038@...ts.linaro.org,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v2 08/24] fs: btrfs: Use ktime_get_real_ts for root ctime

On Sun, Jun 19, 2016 at 05:27:07PM -0700, Deepa Dinamani wrote:
> btrfs_root_item maintains the ctime for root updates.
> This is not part of vfs_inode.
> 
> Since current_time() uses struct inode* as an argument
> as Linus suggested, this cannot be used to update root
> times unless, we modify the signature to use inode.
> 
> Since btrfs uses nanosecond time granularity, it can also
> use ktime_get_real_ts directly to obtain timestamp for
> the root. It is necessary to use the timespec time api
> here because the same btrfs_set_stack_timespec_*() apis
> are used for vfs inode times as well. These can be
> transitioned to using timespec64 when btrfs internally
> changes to use timespec64 as well.
> 
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> Cc: Chris Mason <clm@...com>
> Cc: Josef Bacik <jbacik@...com>

Acked-by: David Sterba <dsterba@...e.com>