Re: [PATCH] btrfs: use inode->i_sb to calculate fs_info

[Boris Burkov <boris@bur.io>]

On Mon, Feb 09, 2026 at 02:11:37PM -0500, Goldwyn Rodrigues wrote:
> If overlay is used on top of btrfs, dentry->d_sb translates to overlay's
> super block and fsid assignment will lead to a crash.
> 
> Use inode->i_sb to calculate btrfs_sb.
> 

I'd prefer the commit title to note the fact that its a tracepoint, but
that's fully a nit.

Reviewed-by: Boris Burkov <boris@bur.io>

> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
> ---
>  include/trace/events/btrfs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
> index 125bdc166bfe..94a197557382 100644
> --- a/include/trace/events/btrfs.h
> +++ b/include/trace/events/btrfs.h
> @@ -772,7 +772,7 @@ TRACE_EVENT(btrfs_sync_file,
>  		const struct dentry *dentry = file->f_path.dentry;
>  		const struct inode *inode = d_inode(dentry);
>  
> -		TP_fast_assign_fsid(btrfs_sb(file->f_path.dentry->d_sb));
> +		TP_fast_assign_fsid(btrfs_sb(inode->i_sb));
>  		__entry->ino		= btrfs_ino(BTRFS_I(inode));
>  		__entry->parent		= btrfs_ino(BTRFS_I(d_inode(dentry->d_parent)));
>  		__entry->datasync	= datasync;
> -- 
> 2.53.0