Re: [PATCH] erofs: skip sufficiently large global buffers when resizing

[Gao Xiang]

On Sat, Aug 22, 2026 at 07:30:17PM +0530, Nikhil Gurudasani wrote:
> z_erofs_gbuf_nrpages is advanced only after every global buffer has been
> grown. If a resize fails after some buffers were enlarged, a retry
> revisits those enlarged buffers.
> 
> Retrying the same size then returns -ENOMEM because alloc_pages_bulk()
> has no pages to add and the unchanged return value is treated as a
> failure. Retrying an intermediate size allocates a temporary pointer
> array smaller than gbuf->nrpages and copies more existing pointers than
> the array can hold.
> 
> Skip buffers that already satisfy the request. Once all remaining
> buffers have caught up, advancing z_erofs_gbuf_nrpages again describes
> the guaranteed minimum size across the pool.
> 
> Fixes: d6db47e571dc ("erofs: do not use pagepool in z_erofs_gbuf_growsize()")
> Cc: stable@xxxxxxxxxxxxxxx # 6.10+
> Signed-off-by: Nikhil Gurudasani <nikhilgurudasani314@xxxxxxxxx>

Reviewed-by: Gao Xiang <xiang@xxxxxxxxxx>

Thanks,
Gao Xiang