linux-ext4 - Re: [PATCH V5 3/5]ext4: quota handling for delayed allocation

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Date:	Mon, 12 Jan 2009 16:47:09 -0800
From:	Mingming Cao <cmm@...ibm.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, tytso <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH V5 3/5]ext4: quota handling for delayed allocation


在 2009-01-06二的 10:39 +0100，Jan Kara写道：
> On Tue 06-01-09 10:35:29, Jan Kara wrote:
> > On Mon 05-01-09 20:40:55, Mingming Cao wrote:
> > > ext4: quota reservation for delayed allocation
> > > 
> > > Uses quota reservation/claim/release to handle quota properly for delayed
> > > allocation in the three steps: 1) quotas are reserved when data being copied
> > > to cache when block allocation is defered 2) when new blocks are allocated.
> > > reserved quotas are converted to the real allocated quota, 2) over-booked
> > > quotas for metadata blocks are released back.
> > > 
> > > Signed-off-by: Mingming Cao <cmm@...ibm.com>
> >   The patch looks fine as far as I can tell :). But I'm not to familiar
> > with the code so I won't add my Acked-by...
>   On a second thought:
> 
> > > +unsigned long long ext4_get_reserved_space(struct inode *inode)
> > > +{
> > > +	unsigned long long total;
> > > +
> > > +	spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
> > > +	total = EXT4_I(inode)->i_reserved_data_blocks +
> > > +		EXT4_I(inode)->i_reserved_meta_blocks;
> > > +	spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
> > > +
> > > +	return total;
> > > +}
>   Shouldn't we return here (total << inode->i_blksize)? Quota expects
> bytes as output...
> 

This is updated ext4 part to return number of bytes reserved as output.

Thanks,
Mingming

View attachment "ext4-delalloc-quota-spt.patch" of type "text/x-patch" (7495 bytes)