Re: [PATCH] fuse: fix return value of inode_inline_reclaim_one_dmap in error path

[Jingbo Xu]

ping...

On 4/24/23 8:32 PM, Jingbo Xu wrote:
> When range already got reclaimed by somebody else, return NULL so that
> the caller could retry to allocate or reclaim another range, instead of
> mistakenly returning the range already got reclaimed and reused by
> others.
> 
> Reported-by: Liu Jiang <gerry@xxxxxxxxxxxxxxxxx>
> Fixes: 9a752d18c85a ("virtiofs: add logic to free up a memory range")
> Signed-off-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
> ---
>  fs/fuse/dax.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
> index 8e74f278a3f6..59aadfd89ee5 100644
> --- a/fs/fuse/dax.c
> +++ b/fs/fuse/dax.c
> @@ -985,6 +985,7 @@ inode_inline_reclaim_one_dmap(struct fuse_conn_dax *fcd, struct inode *inode,
>  	node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
>  	/* Range already got reclaimed by somebody else */
>  	if (!node) {
> +		dmap = NULL;
>  		if (retry)
>  			*retry = true;
>  		goto out_write_dmap_sem;

-- 
Thanks,
Jingbo