linux-kernel - Re: [PATCH] ext4: fix __ext4_xattr_set

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Message-Id: <4D46B5E7-4001-44FE-BE94-82636D1F8512@dilger.ca>
Date:   Wed, 28 Jun 2017 16:26:39 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Tahsin Erdogan <tahsin@...gle.com>
Cc:     "Darrick J . Wong" <darrick.wong@...cle.com>,
        Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: fix __ext4_xattr_set_credits()

On Jun 28, 2017, at 3:47 PM, Tahsin Erdogan <tahsin@...gle.com> wrote:
> 
> __ext4_xattr_set_credits() calculates journal credits needed for a
> set xattr operation. Currently, credits needed for quota updates are
> added only if ea_inode feature is enabled which is wrong. Fix this by
> moving quota related additions to above ea_inode feature check.
> 
> Fixes: 74c5bfa651af ("ext4: xattr inode deduplication")
> 
> Signed-off-by: Tahsin Erdogan <tahsin@...gle.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> fs/ext4/xattr.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index ce12c3fb7e59..062756b4e6d8 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -845,6 +845,9 @@ static int __ext4_xattr_set_credits(struct super_block *sb,
> 	 */
> 	credits = 5;
> 
> +	/* Quota updates. */
> +	credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb);
> +
> 	/* We are done if ea_inode feature is not enabled. */
> 	if (!ext4_has_feature_ea_inode(sb))
> 		return credits;
> @@ -878,9 +881,6 @@ static int __ext4_xattr_set_credits(struct super_block *sb,
> 	/* Block bitmap and group descriptor updates for each block. */
> 	credits += blocks * 2;
> 
> -	/* Quota updates. */
> -	credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb);
> -
> 	/* We may need to clone the existing xattr block in which case we need
> 	 * to increment ref counts for existing ea_inodes referenced by it.
> 	 */
> --
> 2.13.2.725.g09c95d1e9-goog
> 


Cheers, Andreas






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