linux-ext4 - Re: [PATCH 11/12] jfs: Convert to private i

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Date:	Fri, 10 Oct 2014 10:33:02 -0500
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org
CC:	linux-ext4@...r.kernel.org, Dave Chinner <david@...morbit.com>,
	xfs@....sgi.com, cluster-devel@...hat.com,
	Steven Whitehouse <swhiteho@...hat.com>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
	reiserfs-devel@...r.kernel.org, Jeff Mahoney <jeffm@...e.de>,
	Dave Kleikamp <shaggy@...nel.org>,
	jfs-discussion@...ts.sourceforge.net, tytso@....edu,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH 11/12] jfs: Convert to private i_dquot field

On 10/10/2014 09:55 AM, Jan Kara wrote:
> CC: Dave Kleikamp <shaggy@...nel.org>
> CC: jfs-discussion@...ts.sourceforge.net
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  fs/jfs/jfs_incore.h |  3 +++
>  fs/jfs/super.c      | 13 +++++++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h
> index cf47f09e8ac8..fa7e795bd8ae 100644
> --- a/fs/jfs/jfs_incore.h
> +++ b/fs/jfs/jfs_incore.h
> @@ -94,6 +94,9 @@ struct jfs_inode_info {
>  			unchar _inline_ea[128];	/* 128: inline extended attr */
>  		} link;
>  	} u;
> +#ifdef CONFIG_QUOTA
> +	struct dquot *i_dquot[MAXQUOTAS];
> +#endif
>  	u32 dev;	/* will die when we get wide dev_t */
>  	struct inode	vfs_inode;
>  };
> diff --git a/fs/jfs/super.c b/fs/jfs/super.c
> index adf8cb045b9e..a13727dd3826 100644
> --- a/fs/jfs/super.c
> +++ b/fs/jfs/super.c
> @@ -54,6 +54,7 @@ static struct kmem_cache *jfs_inode_cachep;
>  
>  static const struct super_operations jfs_super_operations;
>  static const struct export_operations jfs_export_operations;
> +static const int jfs_inode_fields[IF_FIELD_NR];

see below

>  static struct file_system_type jfs_fs_type;
>  
>  #define MAX_COMMIT_THREADS 64
> @@ -117,6 +118,9 @@ static struct inode *jfs_alloc_inode(struct super_block *sb)
>  	jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
>  	if (!jfs_inode)
>  		return NULL;
> +#ifdef CONFIG_QUOTA
> +	memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
> +#endif
>  	return &jfs_inode->vfs_inode;
>  }
>  
> @@ -537,7 +541,9 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
>  #ifdef CONFIG_QUOTA
>  	sb->dq_op = &dquot_operations;
>  	sb->s_qcop = &dquot_quotactl_ops;
> +	sb_dqopt(sb)->allowed_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
>  #endif
> +	sb_init_inode_fields(sb, jfs_inode_fields);
>  
>  	/*
>  	 * Initialize direct-mapping inode/address-space
> @@ -857,6 +863,13 @@ static const struct super_operations jfs_super_operations = {
>  #endif
>  };
>  
> +static const int jfs_inode_fields[IF_FIELD_NR] = {
> +#ifdef CONFIG_QUOTA
> +	[IF_DQUOTS] = (int)offsetof(struct jfs_inode_info, i_dquot) -
> +		      (int)offsetof(struct jfs_inode_info, vfs_inode),
> +#endif
> +};

Why isn't the initialization done up above where jfs_inode_fields is
first defined?

> +
>  static const struct export_operations jfs_export_operations = {
>  	.fh_to_dentry	= jfs_fh_to_dentry,
>  	.fh_to_parent	= jfs_fh_to_parent,
> 
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