linux-ext4 - Re: [PATCH 06/10] ext4: dedpulicate the code to wait on inode that's being committed

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Date:   Tue, 3 Nov 2020 17:42:03 +0100
From:   Jan Kara <jack@...e.cz>
To:     Harshad Shirwadkar <harshadshirwadkar@...il.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz
Subject: Re: [PATCH 06/10] ext4: dedpulicate the code to wait on inode that's
 being committed

On Sat 31-10-20 13:05:14, Harshad Shirwadkar wrote:
> This patch removes the deduplicates the code that implements waiting
> on inode that's being committed. That code is moved into a new
> function.
> 
> Suggested-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>

Looks good to me. Just one nit below:

> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index b1ca55c7d32a..0f2543220d1d 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -155,6 +155,28 @@ void ext4_fc_init_inode(struct inode *inode)
>  	ei->i_fc_committed_subtid = 0;
>  }
>  
> +static void ext4_fc_wait_committing_inode(struct inode *inode)
> +{
> +	wait_queue_head_t *wq;
> +	struct ext4_inode_info *ei = EXT4_I(inode);
> +

Maybe add lockdep_assert_held(&EXT4_SB(inode->i_sb)->s_fc_lock) here to
make sure the function is called properly? It's kind of unobvious
requirement (but hard to avoid)...

> +#if (BITS_PER_LONG < 64)
> +	DEFINE_WAIT_BIT(wait, &ei->i_state_flags,
> +			EXT4_STATE_FC_COMMITTING);
> +	wq = bit_waitqueue(&ei->i_state_flags,
> +				EXT4_STATE_FC_COMMITTING);
> +#else
> +	DEFINE_WAIT_BIT(wait, &ei->i_flags,
> +			EXT4_STATE_FC_COMMITTING);
> +	wq = bit_waitqueue(&ei->i_flags,
> +				EXT4_STATE_FC_COMMITTING);
> +#endif
> +	prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
> +	spin_unlock(&EXT4_SB(inode->i_sb)->s_fc_lock);
> +	schedule();
> +	finish_wait(wq, &wait.wq_entry);
> +}
> +

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR