linux-kernel - Re: [PATCH 2/4] f2fs: support FIEMAP_FLAG

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Date:   Tue, 9 Jan 2018 11:20:01 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH 2/4] f2fs: support FIEMAP_FLAG_CACHE

On 01/08, Chao Yu wrote:
> This patch factors out f2fs_precache_extents from
> f2fs_ioc_precache_extents, with the new function we can support
> FIEMAP_FLAG_CACHE in ->fiemap.
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/data.c | 12 +++++++++---
>  fs/f2fs/f2fs.h |  1 +
>  fs/f2fs/file.c | 10 +++++++---
>  3 files changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index f38e660bc889..33ae1bd14a8e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1228,11 +1228,17 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
>  	u32 flags = 0;
>  	int ret = 0;
>  
> +	inode_lock(inode);
> +
> +	if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
> +		ret = f2fs_precache_extents(inode);
> +		if (ret)
> +			goto out;
> +	}

I think we have to integrate this patch into the previous one which defines
this new behavior.

Thanks,

> +
>  	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
>  	if (ret)
> -		return ret;
> -
> -	inode_lock(inode);
> +		goto out;
>  
>  	if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
>  		ret = f2fs_xattr_fiemap(inode, fieinfo);
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 14177cebc3e7..3c3a055c3d4a 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -2543,6 +2543,7 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
>  int f2fs_setattr(struct dentry *dentry, struct iattr *attr);
>  int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
>  void truncate_data_blocks_range(struct dnode_of_data *dn, int count);
> +int f2fs_precache_extents(struct inode *inode);
>  long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
>  long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
>  int f2fs_pin_file_control(struct inode *inode, bool inc);
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 14e75871acf3..6e30016f26ad 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2734,9 +2734,8 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
>  	return ret;
>  }
>  
> -static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
> +int f2fs_precache_extents(struct inode *inode)
>  {
> -	struct inode *inode = file_inode(filp);
>  	struct f2fs_inode_info *fi = F2FS_I(inode);
>  	struct f2fs_map_blocks map;
>  	pgoff_t next_pgofs;
> @@ -2763,7 +2762,12 @@ static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
>  		map.m_lblk = next_pgofs;
>  	}
>  
> -	return 0;
> +	return err;
> +}
> +
> +static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
> +{
> +	return f2fs_precache_extents(file_inode(filp));
>  }
>  
>  long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> -- 
> 2.15.0.55.gc2ece9dc4de6