linux-kernel - Re: [PATCH] move remove_dquot

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Message-ID: <20070206111344.GD328@duck.suse.cz>
Date:	Tue, 6 Feb 2007 12:13:44 +0100
From:	Jan Kara <jack@...e.cz>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] move remove_dquot_ref to dqout.c

On Mon 05-02-07 19:05:27, Christoph Hellwig wrote:
> Remove_dquot_ref can move to dqout.c instead of beeing in inode.c
> under #ifdef CONFIG_QUOTA.  Also clean the resulting code up
  Yes, this was because at the time the code was written, inode_lock was not exported
from inode.c.

> a tiny little bit by testing sb->dq_op earlier - it's constant
> over a filesystems lifetime.
  Looks fine.

> Signed-off-by: Christoph Hellwig <hch@....de>
  Signed-off-by: Jan Kara <jack@...e.cz>

> 
> Index: linux-2.6/fs/dquot.c
> ===================================================================
> --- linux-2.6.orig/fs/dquot.c	2007-02-05 18:49:41.000000000 +0100
> +++ linux-2.6/fs/dquot.c	2007-02-05 18:53:49.000000000 +0100
> @@ -79,6 +79,7 @@
>  #include <linux/buffer_head.h>
>  #include <linux/capability.h>
>  #include <linux/quotaops.h>
> +#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
>  
>  #include <asm/uaccess.h>
>  
> @@ -756,15 +757,30 @@
>  	}
>  }
>  
> +static void remove_dquot_ref(struct super_block *sb, int type,
> +		struct list_head *tofree_head)
> +{
> +	struct inode *inode;
> +
> +	spin_lock(&inode_lock);
> +	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
> +		if (!IS_NOQUOTA(inode))
> +			remove_inode_dquot_ref(inode, type, tofree_head);
> +	}
> +	spin_unlock(&inode_lock);
> +}
> +
>  /* Gather all references from inodes and drop them */
>  static void drop_dquot_ref(struct super_block *sb, int type)
>  {
>  	LIST_HEAD(tofree_head);
>  
> -	down_write(&sb_dqopt(sb)->dqptr_sem);
> -	remove_dquot_ref(sb, type, &tofree_head);
> -	up_write(&sb_dqopt(sb)->dqptr_sem);
> -	put_dquot_list(&tofree_head);
> +	if (sb->dq_op) {
> +		down_write(&sb_dqopt(sb)->dqptr_sem);
> +		remove_dquot_ref(sb, type, &tofree_head);
> +		up_write(&sb_dqopt(sb)->dqptr_sem);
> +		put_dquot_list(&tofree_head);
> +	}
>  }
>  
>  static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number)
> Index: linux-2.6/fs/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/inode.c	2007-02-05 18:49:41.000000000 +0100
> +++ linux-2.6/fs/inode.c	2007-02-05 18:49:56.000000000 +0100
> @@ -1252,33 +1252,6 @@
>  
>  EXPORT_SYMBOL(inode_needs_sync);
>  
> -/*
> - *	Quota functions that want to walk the inode lists..
> - */
> -#ifdef CONFIG_QUOTA
> -
> -void remove_dquot_ref(struct super_block *sb, int type,
> -			struct list_head *tofree_head)
> -{
> -	struct inode *inode;
> -
> -	if (!sb->dq_op)
> -		return;	/* nothing to do */
> -	spin_lock(&inode_lock);	/* This lock is for inodes code */
> -
> -	/*
> -	 * We don't have to lock against quota code - test IS_QUOTAINIT is
> -	 * just for speedup...
> -	 */
> -	list_for_each_entry(inode, &sb->s_inodes, i_sb_list)
> -		if (!IS_NOQUOTA(inode))
> -			remove_inode_dquot_ref(inode, type, tofree_head);
> -
> -	spin_unlock(&inode_lock);
> -}
> -
> -#endif
> -
>  int inode_wait(void *word)
>  {
>  	schedule();
> Index: linux-2.6/include/linux/fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/fs.h	2007-02-05 18:51:48.000000000 +0100
> +++ linux-2.6/include/linux/fs.h	2007-02-05 18:51:52.000000000 +0100
> @@ -1681,7 +1681,6 @@
>  extern int __remove_suid(struct dentry *, int);
>  extern int should_remove_suid(struct dentry *);
>  extern int remove_suid(struct dentry *);
> -extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
>  
>  extern void __insert_inode_hash(struct inode *, unsigned long hashval);
>  extern void remove_inode_hash(struct inode *);

										Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
-
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