linux-kernel - [RFC 19/19] erofs: support on demand read

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Message-Id: <20211210073619.21667-20-jefflexu@linux.alibaba.com>
Date:   Fri, 10 Dec 2021 15:36:19 +0800
From:   Jeffle Xu <jefflexu@...ux.alibaba.com>
To:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org
Cc:     linux-fsdevel@...r.kernel.org, joseph.qi@...ux.alibaba.com,
        bo.liu@...ux.alibaba.com, tao.peng@...ux.alibaba.com,
        gerry@...ux.alibaba.com, eguan@...ux.alibaba.com,
        linux-kernel@...r.kernel.org
Subject: [RFC 19/19] erofs: support on demand read

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 fs/erofs/fscache.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index c849d3a89520..3d254cf7a0e3 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -83,9 +83,15 @@ static void erofs_priv_cleanup(struct address_space *mapping, void *netfs_priv)
 {
 }
 
+static void erofs_issue_op(struct netfs_read_subrequest *subreq)
+{
+	netfs_demand_read(subreq);
+}
+
 const struct netfs_read_request_ops erofs_req_ops = {
 	.begin_cache_operation  = erofs_begin_cache_operation,
 	.cleanup		= erofs_priv_cleanup,
+	.issue_op		= erofs_issue_op,
 };
 
 struct page *erofs_readpage_from_fscache(struct fscache_cookie *cookie,
-- 
2.27.0