Re: [f2fs-dev] [PATCH 2/3] f2fs: use __set_page_dirty_nobuffers directly

[Jaegeuk Kim]

On Wed, Nov 02, 2016 at 03:34:32PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
> 
> On 2016/10/21 10:28, Jaegeuk Kim wrote:
> > This patch replaces the copied code with original generic function.
> 
> Will we plan to do further enhance inside f2fs_set_page_dirty_nobuffers, if we
> don't it's better revert fe76b796fc5194cc3d57265002e3a748566d073f, as we don't
> need to wrap __set_page_dirty_nobuffers.

Urg. I was confused something here.
Please ignore this patch. I won't merge this patch.

> BTW, does the original patch make memory cgroup functionality problematic?

I don't think there is a problem, since I just copied __set_page_dirty_buffers()
except page_has_buffers' stuffs.

Thank you for pointing this out. :)

> 
> Thanks,
> 
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> > ---
> >  fs/f2fs/data.c | 29 -----------------------------
> >  fs/f2fs/f2fs.h |  6 +++++-
> >  2 files changed, 5 insertions(+), 30 deletions(-)
> > 
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 68edb47..3954315 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -1801,35 +1801,6 @@ int f2fs_release_page(struct page *page, gfp_t wait)
> >  	return 1;
> >  }
> >  
> > -/*
> > - * This was copied from __set_page_dirty_buffers which gives higher performance
> > - * in very high speed storages. (e.g., pmem)
> > - */
> > -void f2fs_set_page_dirty_nobuffers(struct page *page)
> > -{
> > -	struct address_space *mapping = page->mapping;
> > -	unsigned long flags;
> > -
> > -	if (unlikely(!mapping))
> > -		return;
> > -
> > -	spin_lock(&mapping->private_lock);
> > -	lock_page_memcg(page);
> > -	SetPageDirty(page);
> > -	spin_unlock(&mapping->private_lock);
> > -
> > -	spin_lock_irqsave(&mapping->tree_lock, flags);
> > -	WARN_ON_ONCE(!PageUptodate(page));
> > -	account_page_dirtied(page, mapping);
> > -	radix_tree_tag_set(&mapping->page_tree,
> > -			page_index(page), PAGECACHE_TAG_DIRTY);
> > -	spin_unlock_irqrestore(&mapping->tree_lock, flags);
> > -	unlock_page_memcg(page);
> > -
> > -	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
> > -	return;
> > -}
> > -
> >  static int f2fs_set_data_page_dirty(struct page *page)
> >  {
> >  	struct address_space *mapping = page->mapping;
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 168f939..b66a04c 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1960,6 +1960,11 @@ static inline unsigned long f2fs_find_next_bit(const void *addr,
> >  	return find_next_bit(addr, size, offset + 2);
> >  }
> >  
> > +static inline void f2fs_set_page_dirty_nobuffers(struct page *page)
> > +{
> > +	__set_page_dirty_nobuffers(page);
> > +}
> > +
> >  #define get_inode_mode(i) \
> >  	((is_inode_flag_set(i, FI_ACL_MODE)) ? \
> >  	 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
> > @@ -2200,7 +2205,6 @@ struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
> >  int do_write_data_page(struct f2fs_io_info *);
> >  int f2fs_map_blocks(struct inode *, struct f2fs_map_blocks *, int, int);
> >  int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *, u64, u64);
> > -void f2fs_set_page_dirty_nobuffers(struct page *);
> >  void f2fs_invalidate_page(struct page *, unsigned int, unsigned int);
> >  int f2fs_release_page(struct page *, gfp_t);
> >  #ifdef CONFIG_MIGRATION
> >