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

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Message-Id: <20240916091647.dbcca9d29f081c7a4c5cd2ea@linux-foundation.org>
Date: Mon, 16 Sep 2024 09:16:47 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>
Cc: joseph.qi@...ux.alibaba.com, junxiao.bi@...cle.com,
 rajesh.sivaramasubramaniom@...cle.com, ocfs2-devel@...ts.linux.dev,
 stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC V4 1/1] ocfs2: reserve space for inline xattr before
 attaching reflink tree

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 :(