Re: [PATCH 29/29] ext4: Remove ext4_ioend_wait()

[Jan Kara <jack@suse.cz>]

On Wed 08-05-13 15:57:12, Zheng Liu wrote:
> On Mon, Apr 08, 2013 at 11:32:34PM +0200, Jan Kara wrote:
> > Now that we clear PageWriteback after extent conversion, there's no need
> > to wait for io_end processing in ext4_evict_inode(). Running AIO/DIO
> > keeps file reference until aio_complete() is called so ext4_evict_inode()
> > cannot be called. For io_end structures resulting from buffered IO
> > waiting is happening because we wait for PageWriteback in
> > truncate_inode_pages().
> > 
> > Signed-off-by: Jan Kara <jack@suse.cz>
> 
> Need to be rebased.
> Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
  Thanks for you effort with reviewing all the patches in this big series!
I really appreciate that.

								Honza
> > ---
> >  fs/ext4/ext4.h    |    1 -
> >  fs/ext4/inode.c   |    5 +++--
> >  fs/ext4/page-io.c |    7 -------
> >  3 files changed, 3 insertions(+), 10 deletions(-)
> > 
> > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> > index 859f235..b359aef 100644
> > --- a/fs/ext4/ext4.h
> > +++ b/fs/ext4/ext4.h
> > @@ -2605,7 +2605,6 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
> >  /* page-io.c */
> >  extern int __init ext4_init_pageio(void);
> >  extern void ext4_exit_pageio(void);
> > -extern void ext4_ioend_wait(struct inode *);
> >  extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
> >  extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
> >  extern int ext4_put_io_end(ext4_io_end_t *io_end);
> > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> > index f493ec2..1f88941 100644
> > --- a/fs/ext4/inode.c
> > +++ b/fs/ext4/inode.c
> > @@ -188,8 +188,6 @@ void ext4_evict_inode(struct inode *inode)
> >  
> >  	trace_ext4_evict_inode(inode);
> >  
> > -	ext4_ioend_wait(inode);
> > -
> >  	if (inode->i_nlink) {
> >  		/*
> >  		 * When journalling data dirty buffers are tracked only in the
> > @@ -219,6 +217,8 @@ void ext4_evict_inode(struct inode *inode)
> >  			filemap_write_and_wait(&inode->i_data);
> >  		}
> >  		truncate_inode_pages(&inode->i_data, 0);
> > +
> > +		WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
> >  		goto no_delete;
> >  	}
> >  
> > @@ -229,6 +229,7 @@ void ext4_evict_inode(struct inode *inode)
> >  		ext4_begin_ordered_truncate(inode, 0);
> >  	truncate_inode_pages(&inode->i_data, 0);
> >  
> > +	WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
> >  	if (is_bad_inode(inode))
> >  		goto no_delete;
> >  
> > diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
> > index 1156b9f..e720d4e 100644
> > --- a/fs/ext4/page-io.c
> > +++ b/fs/ext4/page-io.c
> > @@ -44,13 +44,6 @@ void ext4_exit_pageio(void)
> >  	kmem_cache_destroy(io_end_cachep);
> >  }
> >  
> > -void ext4_ioend_wait(struct inode *inode)
> > -{
> > -	wait_queue_head_t *wq = ext4_ioend_wq(inode);
> > -
> > -	wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0));
> > -}
> > -
> >  /*
> >   * Print an buffer I/O error compatible with the fs/buffer.c.  This
> >   * provides compatibility with dmesg scrapers that look for a specific
> > -- 
> > 1.7.1
> > 
> > --
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-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR