linux-kernel - Re: [PATCH] quota: fix reserved space management for ordinary fs

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Message-ID: <20100108124139.GC3354@quack.suse.cz>
Date:	Fri, 8 Jan 2010 13:41:39 +0100
From:	Jan Kara <jack@...e.cz>
To:	Greg KH <gregkh@...e.de>
Cc:	Dmitry Monakhov <dmonakhov@...nvz.org>,
	Dmitry Monakhov <rjevskiy@...il.com>, Greg KH <gregkh@...e.de>,
	Thomas Voegtle <tv@...96.de>, Jan Kara <jack@...e.cz>,
	Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...nel.org
Subject: Re: [PATCH] quota: fix reserved space management for ordinary fs

On Fri 08-01-10 03:53:54, Dmitry Monakhov wrote:
> 
> In fact inode_get_rsv_space() function is special in comparison
> with inode_{add,sub,claim}_rsv_space() functions, because
> it may return correct result even for fs without reserved space
> support(correct val == 0). Add trivial check for that case.
> The patch fix regression(BUG at fs/quota/dquot.c:1350) introduced
> in following commit: fd8fbfc1709822bd94247c5b2ab15a5f5041e103
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
  Acked-by: Jan Kara <jack@...e.cz>

Greg, please merge this patch to stable series. I'll push the same
patch I have in my tree to Linus on Monday.

								Honza
> ---
>  fs/quota/dquot.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index dea86ab..d9f06cf 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -1377,6 +1377,8 @@ static void inode_sub_rsv_space(struct inode *inode, qsize_t number)
>  static qsize_t inode_get_rsv_space(struct inode *inode)
>  {
>  	qsize_t ret;
> +	if (!inode->i_sb->dq_op->get_reserved_space)
> +		return 0;
>  	spin_lock(&inode->i_lock);
>  	ret = *inode_reserved_space(inode);
>  	spin_unlock(&inode->i_lock);
> -- 
> 1.6.3.3
> 
> 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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