From nobody Sat Feb 7 07:15:11 2026 Received: from canpmsgout06.his.huawei.com (canpmsgout06.his.huawei.com [113.46.200.221]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB7E031A54C; Wed, 31 Dec 2025 09:14:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.221 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767172453; cv=none; b=SpWL4Dzak6pxbkg4aFV2EeWmP/Hu86AmHoqVEuNH60eHq7EfUiSD5elQnfEa3WRk+3SMvRRZvt7E9yASZMnkzw5d8gbYzys5sHURf60vauJiUWeI/cPyO60kc3CErQ8H68uq7OxsVWAoXvhQNtu58OnPoDkJ35DP5Z56ocGZCHo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767172453; c=relaxed/simple; bh=78DH+j+x3P9qyj0ZcYKGVjdZblPl5ZHKAV8AZKMu7V4=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ue0y/JJoY07w8he0qp0H4pbmeBKVLXV9G89cd8TjWTmJ1FsRww9gvyq6QfksC8P2+KDfO5rYloZX/CIW6tkfBwbFmWI8GEi3IVAHN/zdbBFtvc8o8WP8kCippVdSB2+pakx/Y5jnRWWpYvCIYtaYlFEpBJxblGGyYo3d0FsdJwU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=IlA3NzPR; arc=none smtp.client-ip=113.46.200.221 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="IlA3NzPR" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=CV6/Y+pgopddex/1nQUVVxg9kFgB/FWJT+yu9bxaR4s=; b=IlA3NzPRr2/WRpzKhfXsB0X7lTw4dVqWf0JoKrh6H4uyv2gtI7Mog1RDhi/bDL2CChb49P+lj ZiS4qWldVfzz2fvMfYhs68jNDVpFFpBh0FyPxQx82qhMzWiD/GA9420s8Z75VJLhwZON+yNQtYS eC6kHRhkpGxPWGc0mqciP/w= Received: from mail.maildlp.com (unknown [172.19.163.0]) by canpmsgout06.his.huawei.com (SkyGuard) with ESMTPS id 4dh41l04nXzRhR8; Wed, 31 Dec 2025 17:10:51 +0800 (CST) Received: from kwepemr500015.china.huawei.com (unknown [7.202.195.162]) by mail.maildlp.com (Postfix) with ESMTPS id 79BA24056B; Wed, 31 Dec 2025 17:14:02 +0800 (CST) Received: from huawei.com (10.67.174.162) by kwepemr500015.china.huawei.com (7.202.195.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 31 Dec 2025 17:14:01 +0800 From: Hongbo Li To: , , CC: , , , , , , Subject: [PATCH v12 09/10] erofs: support compressed inodes for page cache share Date: Wed, 31 Dec 2025 09:01:17 +0000 Message-ID: <20251231090118.541061-10-lihongbo22@huawei.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20251231090118.541061-1-lihongbo22@huawei.com> References: <20251231090118.541061-1-lihongbo22@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To kwepemr500015.china.huawei.com (7.202.195.162) Content-Type: text/plain; charset="utf-8" From: Hongzhen Luo This patch adds page cache sharing functionality for compressed inodes. Signed-off-by: Hongzhen Luo Signed-off-by: Hongbo Li --- fs/erofs/zdata.c | 37 ++++++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 13 deletions(-) diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 65da21504632..2697c703a4c4 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -493,7 +493,8 @@ enum z_erofs_pclustermode { }; =20 struct z_erofs_frontend { - struct inode *const inode; + struct inode *inode; + struct inode *sharedinode; struct erofs_map_blocks map; struct z_erofs_bvec_iter biter; =20 @@ -508,8 +509,8 @@ struct z_erofs_frontend { unsigned int icur; }; =20 -#define Z_EROFS_DEFINE_FRONTEND(fe, i, ho) struct z_erofs_frontend fe =3D = { \ - .inode =3D i, .head =3D Z_EROFS_PCLUSTER_TAIL, \ +#define Z_EROFS_DEFINE_FRONTEND(fe, i, si, ho) struct z_erofs_frontend fe = =3D { \ + .inode =3D i, .sharedinode =3D si, .head =3D Z_EROFS_PCLUSTER_TAIL, \ .mode =3D Z_EROFS_PCLUSTER_FOLLOWED, .headoffset =3D ho } =20 static bool z_erofs_should_alloc_cache(struct z_erofs_frontend *fe) @@ -1866,7 +1867,7 @@ static void z_erofs_pcluster_readmore(struct z_erofs_= frontend *f, pgoff_t index =3D cur >> PAGE_SHIFT; struct folio *folio; =20 - folio =3D erofs_grab_folio_nowait(inode->i_mapping, index); + folio =3D erofs_grab_folio_nowait(f->sharedinode->i_mapping, index); if (!IS_ERR_OR_NULL(folio)) { if (folio_test_uptodate(folio)) folio_unlock(folio); @@ -1883,8 +1884,10 @@ static void z_erofs_pcluster_readmore(struct z_erofs= _frontend *f, =20 static int z_erofs_read_folio(struct file *file, struct folio *folio) { - struct inode *const inode =3D folio->mapping->host; - Z_EROFS_DEFINE_FRONTEND(f, inode, folio_pos(folio)); + struct inode *const sharedinode =3D folio->mapping->host; + bool need_iput; + struct inode *realinode =3D erofs_real_inode(sharedinode, &need_iput); + Z_EROFS_DEFINE_FRONTEND(f, realinode, sharedinode, folio_pos(folio)); int err; =20 trace_erofs_read_folio(folio, false); @@ -1896,23 +1899,28 @@ static int z_erofs_read_folio(struct file *file, st= ruct folio *folio) /* if some pclusters are ready, need submit them anyway */ err =3D z_erofs_runqueue(&f, 0) ?: err; if (err && err !=3D -EINTR) - erofs_err(inode->i_sb, "read error %d @ %lu of nid %llu", - err, folio->index, EROFS_I(inode)->nid); + erofs_err(realinode->i_sb, "read error %d @ %lu of nid %llu", + err, folio->index, EROFS_I(realinode)->nid); =20 erofs_put_metabuf(&f.map.buf); erofs_release_pages(&f.pagepool); + + if (need_iput) + iput(realinode); return err; } =20 static void z_erofs_readahead(struct readahead_control *rac) { - struct inode *const inode =3D rac->mapping->host; - Z_EROFS_DEFINE_FRONTEND(f, inode, readahead_pos(rac)); + struct inode *const sharedinode =3D rac->mapping->host; + bool need_iput; + struct inode *realinode =3D erofs_real_inode(sharedinode, &need_iput); + Z_EROFS_DEFINE_FRONTEND(f, realinode, sharedinode, readahead_pos(rac)); unsigned int nrpages =3D readahead_count(rac); struct folio *head =3D NULL, *folio; int err; =20 - trace_erofs_readahead(inode, readahead_index(rac), nrpages, false); + trace_erofs_readahead(realinode, readahead_index(rac), nrpages, false); z_erofs_pcluster_readmore(&f, rac, true); while ((folio =3D readahead_folio(rac))) { folio->private =3D head; @@ -1926,8 +1934,8 @@ static void z_erofs_readahead(struct readahead_contro= l *rac) =20 err =3D z_erofs_scan_folio(&f, folio, true); if (err && err !=3D -EINTR) - erofs_err(inode->i_sb, "readahead error at folio %lu @ nid %llu", - folio->index, EROFS_I(inode)->nid); + erofs_err(realinode->i_sb, "readahead error at folio %lu @ nid %llu", + folio->index, EROFS_I(realinode)->nid); } z_erofs_pcluster_readmore(&f, rac, false); z_erofs_pcluster_end(&f); @@ -1935,6 +1943,9 @@ static void z_erofs_readahead(struct readahead_contro= l *rac) (void)z_erofs_runqueue(&f, nrpages); erofs_put_metabuf(&f.map.buf); erofs_release_pages(&f.pagepool); + + if (need_iput) + iput(realinode); } =20 const struct address_space_operations z_erofs_aops =3D { --=20 2.22.0