[PATCH v2] erofs: allow sharing page cache with the same aops only

[Gao Xiang]

On 2026/2/14 11:02, Hongbo Li wrote:
> Inode with identical data but different @aops cannot be mixed
> because the page cache is managed by different subsystems (e.g.,
> @aops for compressed on-disk inodes cannot handle plain on-disk
> inodes).
> 
> In this patch, we never allow inodes to share the page cache
> among plain, compressed, and fileio cases. When a shared inode
> is created, we initialize @aops that is the same as the initial
> real inode, and subsequent inodes cannot share the page cache
> if the inferred @aops differ from the corresponding shared inode.
> 
> This is reasonable as a first step because, in typical use cases,
> if an inode is compressible, it will fall into compressed
> inodes across different filesystem images unless users use plain
> filesystems. However, in that cases, users will use plain
> filesystems all the time.
> 
> Fixes: 5ef3208e3be5 ("erofs: introduce the page cache share feature")
> Signed-off-by: Hongbo Li <lihongbo22 at huawei.com>

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

Thanks,
Gao Xiang