linux-ext4 - Re: [PATCH] ext4: remove readpage() check up for mmap file

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Date:	Wed, 2 Jul 2014 15:15:54 +0000
From:	"Zwisler, Ross" <ross.zwisler@...el.com>
To:	"zhenzhang.zhang@...wei.com" <zhenzhang.zhang@...wei.com>
CC:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"jack@...e.cz" <jack@...e.cz>, "tytso@....edu" <tytso@....edu>
Subject: Re: [PATCH] ext4: remove readpage() check up for mmap file

On Wed, 2014-07-02 at 12:01 +0800, Zhang Zhen wrote:
> There is no kind of file does not supply page reading function.
> 
> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
> ---
>  fs/ext4/file.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 8695f70..f5c0a17 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -202,8 +202,6 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
>  {
>  	struct address_space *mapping = file->f_mapping;

Assuming this change is correct, the 'mapping' variable is now unused and can
also be deleted.

> 
> -	if (!mapping->a_ops->readpage)
> -		return -ENOEXEC;
>  	file_accessed(file);
>  	vma->vm_ops = &ext4_file_vm_ops;
>  	return 0;