linux-kernel - Re: [RFC] lockdep: Add helper function for dir vs file i

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Date:	Thu, 25 Aug 2011 07:25:33 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, davej@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] lockdep: Add helper function for dir vs file i_mutex
 annotation

On Thu, Aug 25, 2011 at 10:58:03AM +0200, Peter Zijlstra wrote:
> On Wed, 2011-08-24 at 21:37 -0400, Josh Boyer wrote:
> 
> > and make it work.  Given that the helper function calls
> > lockdep_match_key and that isn't defined unless CONFIG_DEBUG_LOCK_ALLOC
> > is set, I opted to make the caller require #ifdefing it still.  If that's
> > too ugly, I could define it in both cases but then we'd have an exported
> > symbol that did nothing when the config option is disabled.
> 
> 
> > diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> > index 87b6e04..ab956c8 100644
> > --- a/fs/hugetlbfs/inode.c
> > +++ b/fs/hugetlbfs/inode.c
> > @@ -491,6 +491,9 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
> >  			inode->i_op = &page_symlink_inode_operations;
> >  			break;
> >  		}
> > +#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > +		lockdep_annotate_inode_mutex_key(inode);
> > +#endif
> >  	}
> >  	return inode;
> >  }
> > diff --git a/fs/inode.c b/fs/inode.c
> > index 73920d5..ec1c612 100644
> > --- a/fs/inode.c
> > +++ b/fs/inode.c
> > @@ -848,16 +848,9 @@ struct inode *new_inode(struct super_block *sb)
> >  }
> >  EXPORT_SYMBOL(new_inode);
> >  
> > -/**
> > - * unlock_new_inode - clear the I_NEW state and wake up any waiters
> > - * @inode:	new inode to unlock
> > - *
> > - * Called when the inode is fully initialised to clear the new state of the
> > - * inode and wake up anyone waiting for the inode to finish initialisation.
> > - */
> > -void unlock_new_inode(struct inode *inode)
> > -{
> >  #ifdef CONFIG_DEBUG_LOCK_ALLOC
> > +void lockdep_annotate_inode_mutex_key(struct inode *inode)
> > +{
> >  	if (S_ISDIR(inode->i_mode)) {
> >  		struct file_system_type *type = inode->i_sb->s_type;
> >  
> > @@ -873,6 +866,21 @@ void unlock_new_inode(struct inode *inode)
> >  					  &type->i_mutex_dir_key);
> >  		}
> >  	}
> > +}
> > +EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key);
> > +#endif
> > +
> > +/**
> > + * unlock_new_inode - clear the I_NEW state and wake up any waiters
> > + * @inode:	new inode to unlock
> > + *
> > + * Called when the inode is fully initialised to clear the new state of the
> > + * inode and wake up anyone waiting for the inode to finish initialisation.
> > + */
> > +void unlock_new_inode(struct inode *inode)
> > +{
> 
> > +	lockdep_annotate_inode_mutex_key(inode);
> 
> >  	spin_lock(&inode->i_lock);
> >  	WARN_ON(!(inode->i_state & I_NEW));
> > diff --git a/include/linux/fs.h b/include/linux/fs.h
> > index 178cdb4..a29f9af 100644
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -2318,6 +2318,9 @@ extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*te
> >  extern struct inode * iget_locked(struct super_block *, unsigned long);
> >  extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
> >  extern int insert_inode_locked(struct inode *);
> > +#ifdef CONFIG_DEBUG_LOCK_ALLOC
> > +extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
> 
> #else
> static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
> 
> > +#endif
> >  extern void unlock_new_inode(struct inode *);
> >  extern unsigned int get_next_ino(void);
> 
> 
> Will avoid all the ifdeffery at usage sites nor need the pointless
> export.

Yep, I thought about that after I sent this last night.  I'll fix it and
resend.

josh
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