linux-ext4 - Re: [PATCH 4/4] ext4: Wait for proper transaction commit on fsync

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Message-ID: <87zl728hil.fsf@basil.nowhere.org>
Date:	Wed, 04 Nov 2009 15:57:22 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 4/4] ext4: Wait for proper transaction commit on fsync

Jan Kara <jack@...e.cz> writes:
>  	ext4_io_end_t *cur_aio_dio;
> +
> +	/*
> +	 * Transactions that contain inode's metadata needed to complete
> +	 * fsync and fdatasync, respectively.
> +	 */
> +	atomic_t i_sync_tid;
> +	atomic_t i_datasync_tid;

This might be a stupid question, but the atomic implies you don't hold
any kind of reference to the transaction. So what prevents these IDs
from wrapping while in there? Given it would be probably take a long
time today, but might be not fully future proof to very fast future IO
devices.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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