linux-kernel - Re: [PATCH RFC V4 1/1] ocfs2: reserve space for inline xattr before attaching reflink tree

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Message-ID: <a4ff61ae-c83d-4a6d-837a-4e3c22c99a69@linux.alibaba.com>
Date: Wed, 18 Sep 2024 09:57:05 +0800
From: Joseph Qi <joseph.qi@...ux.alibaba.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
 Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>
Cc: junxiao.bi@...cle.com, rajesh.sivaramasubramaniom@...cle.com,
 ocfs2-devel@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC V4 1/1] ocfs2: reserve space for inline xattr before
 attaching reflink tree



On 9/17/24 12:16 AM, Andrew Morton wrote:
> On Thu, 12 Sep 2024 06:47:20 +0000 Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com> wrote:
> 
>> One of our customers reported a crash and a corrupted ocfs2 filesystem.
>> +++ b/fs/ocfs2/refcounttree.c
>> @@ -25,6 +25,7 @@
>>  #include "namei.h"
>>  #include "ocfs2_trace.h"
>>  #include "file.h"
>> +#include "symlink.h"
>>  
>>  #include <linux/bio.h>
>>  #include <linux/blkdev.h>
>> @@ -4155,8 +4156,9 @@ static int __ocfs2_reflink(struct dentry *old_dentry,
>>  	int ret;
>>  	struct inode *inode = d_inode(old_dentry);
>>  	struct buffer_head *new_bh = NULL;
>> +	struct ocfs2_inode_info *oi = OCFS2_I(inode);
>>  
>> -	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
>> +	if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
>>  		ret = -EINVAL;
>>  		mlog_errno(ret);
>>  		goto out;
>> @@ -4182,6 +4184,26 @@ static int __ocfs2_reflink(struct dentry *old_dentry,
>>  		goto out_unlock;
>>  	}
>>  
>> +	if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) &&
>> +	    (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
>> +		/*
>> +		 * Adjust extent record count to reserve space for extended attribute.
>> +		 * Inline data count had been adjusted in ocfs2_duplicate_inline_data().
>> +		 */
>> +		struct ocfs2_inode_info *new_oi = OCFS2_I(new_inode);
>> +
>> +		if (!(new_oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) &&
>> +		    !(ocfs2_inode_is_fast_symlink(new_inode))) {
>> +			struct ocfs2_dinode *new_di = new_bh->b_data;
>> +			struct ocfs2_dinode *old_di = old_bh->b_data;
> 
> fs/ocfs2/refcounttree.c: In function '__ocfs2_reflink':
> fs/ocfs2/refcounttree.c:4190:55: error: initialization of 'struct ocfs2_dinode *' from incompatible pointer type 'char *' [-Werror=incompatible-pointer-types]
>  4190 |                         struct ocfs2_dinode *new_di = new_bh->b_data;
>       |                                                       ^~~~~~
> fs/ocfs2/refcounttree.c:4191:55: error: initialization of 'struct ocfs2_dinode *' from incompatible pointer type 'char *' [-Werror=incompatible-pointer-types]
>  4191 |                         struct ocfs2_dinode *old_di = old_bh->b_data;
>       |                                                       ^~~~~~
> cc1: all warnings being treated as errors
> 
> I could just add the typecasts, but that doesn't give me a tested patch :(
> 

Oops, sorry for missing this when reviewing.
Hi Gautham, could you please add the missing typecasts and confirm it?

Thanks,
Joseph