linux-ext4 - Re: [PATCH] Ext4: avoid multiple quota reservation when retry block reservation for delalloc

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Date:	Mon, 21 Sep 2009 16:18:02 -0700
From:	Mingming <cmm@...ibm.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] Ext4: avoid multiple quota reservation when retry
	block reservation for delalloc

On Mon, 2009-09-21 at 20:15 +0200, Jan Kara wrote:
> On Mon 21-09-09 09:52:30, Mingming wrote:
> > Ext4: release reserved quota before block reservation for delalloc retry
> > 
> > ext4_da_reserve_space() can reserve quota blocks multiple times if
> > ext4_claim_free_blocks() fail and we retry the allocation. We should
> > release the quota reservation before restarting.
> > 
> > Bug found be Jan Kara.
>             ^^ by

attached is the updated patch with this typo fixed.

> > 
> > Signed-off-by: Mingming Cao <cmm@...ibm.com>
> > 
> > ---
> >  fs/ext4/inode.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Index: linux-2.6.31-rc4/fs/ext4/inode.c
> > ===================================================================
> > --- linux-2.6.31-rc4.orig/fs/ext4/inode.c
> > +++ linux-2.6.31-rc4/fs/ext4/inode.c
> > @@ -1785,11 +1785,11 @@ repeat:
> >  
> >  	if (ext4_claim_free_blocks(sbi, total)) {
> >  		spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
> > +		vfs_dq_release_reservation_block(inode, total);
> >  		if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
> >  			yield();
> >  			goto repeat;
> >  		}
> > -		vfs_dq_release_reservation_block(inode, total);
> >  		return -ENOSPC;
> >  	}
> >  	EXT4_I(inode)->i_reserved_data_blocks += nrblocks;
> > 
>   The patch is fine. Acked-by: Jan Kara <jack@...e.cz>

Thanks!

> But it's certainly not the issue hit by Pavol but I'm out of ideas where
> could be a problem provided he runs with extents...
> 

I am not sure where is the problem reported by Pavol by looking at the
code either. Perhaps enable some debugging code, but I am under
impression that the system is in-use now...

Mingming

View attachment "quota-dealloc-fix.patch" of type "text/x-patch" (1001 bytes)