linux-kernel - Re: [PATCH] btrfs: remove unused condition check in btrfs_page

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Date:   Tue, 3 Dec 2019 16:33:33 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     Omar Sandoval <osandov@...ndov.com>
CC:     <clm@...com>, <josef@...icpanda.com>, <dsterba@...e.com>,
        <linux-btrfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "hushiyuan@...wei.com" <hushiyuan@...wei.com>,
        "linfeilong@...wei.com" <linfeilong@...wei.com>
Subject: Re: [PATCH] btrfs: remove unused condition check in
 btrfs_page_mkwrite()



On 2019/12/3 16:24, Omar Sandoval wrote:
> On Tue, Dec 03, 2019 at 04:16:43PM +0800, Yunfeng Ye wrote:
>> The condition '!ret2' is always true. so remove the unused condition
>> check.
>>
>> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
> 
> For this sort of change, one should mention how the code got in this
> state. In this case, commit 717beb96d969 ("Btrfs: fix regression in
> btrfs_page_mkwrite() from vm_fault_t conversion") left behind the check
> after moving this code out of the goto.
> 
ok, I will update the comment, thanks.

> Ohter than that,
> 
> Reviewed-by: Omar Sandoval <osandov@...com>
> 
>> ---
>>  fs/btrfs/inode.c | 11 ++++-------
>>  1 file changed, 4 insertions(+), 7 deletions(-)
>>
>> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
>> index 56032c518b26..eef2432597e2 100644
>> --- a/fs/btrfs/inode.c
>> +++ b/fs/btrfs/inode.c
>> @@ -9073,7 +9073,6 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
>>  		ret = VM_FAULT_SIGBUS;
>>  		goto out_unlock;
>>  	}
>> -	ret2 = 0;
>>
>>  	/* page is wholly or partially inside EOF */
>>  	if (page_start + PAGE_SIZE > size)
>> @@ -9097,12 +9096,10 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
>>
>>  	unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
>>
>> -	if (!ret2) {
>> -		btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
>> -		sb_end_pagefault(inode->i_sb);
>> -		extent_changeset_free(data_reserved);
>> -		return VM_FAULT_LOCKED;
>> -	}
>> +	btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
>> +	sb_end_pagefault(inode->i_sb);
>> +	extent_changeset_free(data_reserved);
>> +	return VM_FAULT_LOCKED;
>>
>>  out_unlock:
>>  	unlock_page(page);
>> -- 
>> 2.7.4
>>
> 
> .
>