Re: [f2fs-dev] [PATCH] f2fs: check if inode's state is dirty or not before skip fsync

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On Mon, Dec 01, 2014 at 04:05:20PM +0900, Changman Lee wrote:
> It makes sense to check inode's state than check if
> inode page is dirty or not.

Nice catch.
However, we should leave the original condition, since write_inode can be called
in prior to this fsync call.
And, this is not a proper fix, since it still can skip to write its inode page. 

How about this one?

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 146e58a..6690599 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -168,6 +168,12 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 		return ret;
 	}
 
+	/* if the inode is dirty, let's recover all the time */
+	if (is_inode_flag_set(fi, FI_DIRTY_INODE)) {
+		update_inode_page(inode);
+		goto go_write;
+	}
+
 	/*
 	 * if there is no written data, don't waste time to write recovery info.
 	 */
-- 
2.1.1

> 
> Signed-off-by: Changman Lee <cm224.lee@xxxxxxxxxxx>
> ---
>  fs/f2fs/file.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 7c2ec3e..0c5ae87 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -173,14 +173,11 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
>  	 */
>  	if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
>  			!exist_written_data(sbi, ino, APPEND_INO)) {
> -		struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
>  
>  		/* But we need to avoid that there are some inode updates */
> -		if ((i && PageDirty(i)) || need_inode_block_update(sbi, ino)) {
> -			f2fs_put_page(i, 0);
> +		if (is_inode_flag_set(fi, FI_DIRTY_INODE) ||
> +					need_inode_block_update(sbi, ino))
>  			goto go_write;
> -		}
> -		f2fs_put_page(i, 0);
>  
>  		if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
>  				exist_written_data(sbi, ino, UPDATE_INO))
> -- 
> 1.9.1
> 
> 
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