[PATCH] [PATCH v3] erofs: ensure all folios are managed in erofs_try_to_free_all_cached_folios()

[Gao Xiang]

On 2026/3/31 13:02, Zhan Xusheng wrote:
> folio_trylock() in erofs_try_to_free_all_cached_folios() may
> successfully acquire the folio lock, but the subsequent check
> for erofs_folio_is_managed() can skip unlocking when the folio
> is not managed by EROFS.
> 
> As Gao Xiang pointed out, this condition should not happen in
> practice because compressed_bvecs[] only holds valid cached folios
> at this point — any non-managed folio would have already been
> detached by z_erofs_cache_release_folio() under folio lock.
> 
> Fix this by adding DBG_BUGON() to catch unexpected folios
> and ensure folio_unlock() is always called.
> 
> Suggested-by: Gao Xiang <hsiangkao at linux.alibaba.com>
> Signed-off-by: Zhan Xusheng <zhanxusheng at xiaomi.com>

Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Thanks,
Gao Xiang