linux-kernel - [RFC 11/19] cachefiles: refactor cachefiles_prepare

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Date:   Fri, 10 Dec 2021 15:36:11 +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 11/19] cachefiles: refactor cachefiles_prepare_read

In demand-read mode, fs using fscache for demand-read doesn't know and
care the exact file size of the data blob file, and thus skip the file
size check in this case.

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 fs/cachefiles/io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 60b1eac2ce78..95e9107dc3bb 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -341,7 +341,8 @@ static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subreque
 
 	_enter("%zx @%llx/%llx", subreq->len, subreq->start, i_size);
 
-	if (subreq->start >= i_size) {
+	if (subreq->rreq->type == NETFS_TYPE_CACHE &&
+	    subreq->start >= i_size) {
 		ret = NETFS_FILL_WITH_ZEROES;
 		why = cachefiles_trace_read_after_eof;
 		goto out_no_object;
-- 
2.27.0