linux-kernel - Re: [PATCH 4/8] ceph: drop usage of page

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Message-ID: <fc89e5b9-cfc4-4303-b3ff-81f00a891488@redhat.com>
Date: Thu, 18 Apr 2024 08:28:22 +0800
From: Xiubo Li <xiubli@...hat.com>
To: Kairui Song <kasong@...cent.com>, linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 "Huang, Ying" <ying.huang@...el.com>, Matthew Wilcox <willy@...radead.org>,
 Chris Li <chrisl@...nel.org>, Barry Song <v-songbaohua@...o.com>,
 Ryan Roberts <ryan.roberts@....com>, Neil Brown <neilb@...e.de>,
 Minchan Kim <minchan@...nel.org>, Hugh Dickins <hughd@...gle.com>,
 David Hildenbrand <david@...hat.com>, Yosry Ahmed <yosryahmed@...gle.com>,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 Ilya Dryomov <idryomov@...il.com>, Jeff Layton <jlayton@...nel.org>,
 ceph-devel@...r.kernel.org
Subject: Re: [PATCH 4/8] ceph: drop usage of page_index


On 4/18/24 00:08, Kairui Song wrote:
> From: Kairui Song <kasong@...cent.com>
>
> page_index is needed for mixed usage of page cache and swap cache,
> for pure page cache usage, the caller can just use page->index instead.
>
> It can't be a swap cache page here, so just drop it.
>
> Signed-off-by: Kairui Song <kasong@...cent.com>
> Cc: Xiubo Li <xiubli@...hat.com>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: Jeff Layton <jlayton@...nel.org>
> Cc: ceph-devel@...r.kernel.org
> ---
>   fs/ceph/dir.c   | 2 +-
>   fs/ceph/inode.c | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
> index 0e9f56eaba1e..570a9d634cc5 100644
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -141,7 +141,7 @@ __dcache_find_get_entry(struct dentry *parent, u64 idx,
>   	if (ptr_pos >= i_size_read(dir))
>   		return NULL;
>   
> -	if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
> +	if (!cache_ctl->page || ptr_pgoff != cache_ctl->page->index) {
>   		ceph_readdir_cache_release(cache_ctl);
>   		cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
>   		if (!cache_ctl->page) {
> diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
> index 7b2e77517f23..1f92d3faaa6b 100644
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -1861,7 +1861,7 @@ static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
>   	unsigned idx = ctl->index % nsize;
>   	pgoff_t pgoff = ctl->index / nsize;
>   
> -	if (!ctl->page || pgoff != page_index(ctl->page)) {
> +	if (!ctl->page || pgoff != ctl->page->index) {

Hi Kairui,

Thanks for you patch and will it be doable to switch to folio_index() 
instead ?

Cheers,

- Xiubo


>   		ceph_readdir_cache_release(ctl);
>   		if (idx == 0)
>   			ctl->page = grab_cache_page(&dir->i_data, pgoff);