linux-kernel - [PATCH v2 20/20] erofs: support on-demand reading

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Date:   Tue, 18 Jan 2022 21:12:16 +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: [PATCH v2 20/20] erofs: support on-demand reading

Implement the .issue_op() callback, and all work is done by
netfs_ondemand_read().

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 fs/erofs/fscache.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index e8df35ee4ba8..9ba668c42098 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -28,9 +28,15 @@ static void erofs_noop_cleanup(struct address_space *mapping, void *netfs_priv)
 {
 }
 
+static void erofs_issue_op(struct netfs_read_subrequest *subreq)
+{
+	netfs_ondemand_read(subreq);
+}
+
 static const struct netfs_read_request_ops erofs_blob_req_ops = {
 	.begin_cache_operation  = erofs_blob_begin_cache_operation,
 	.cleanup		= erofs_noop_cleanup,
+	.issue_op		= erofs_issue_op,
 };
 
 static int erofs_begin_cache_operation(struct netfs_read_request *rreq)
@@ -58,6 +64,7 @@ static const struct netfs_read_request_ops erofs_req_ops = {
 	.begin_cache_operation  = erofs_begin_cache_operation,
 	.cleanup		= erofs_noop_cleanup,
 	.clamp_length		= erofs_clamp_length,
+	.issue_op		= erofs_issue_op,
 };
 
 static int erofs_fscache_blob_readpage(struct file *data, struct page *page)
-- 
2.27.0