linux-kernel - [PATCH v2 04/20] cachefiles: extract generic daemon write function

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Message-Id: <20220118131216.85338-5-jefflexu@linux.alibaba.com>
Date:   Tue, 18 Jan 2022 21:12:00 +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 04/20] cachefiles: extract generic daemon write function

... so that the following new devnode can reuse most of the code when
implementing its .write() callback.

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 fs/cachefiles/daemon.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 7ac04ee2c0a0..aa2e5e354afb 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -209,10 +209,11 @@ static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
 /*
  * Take a command from cachefilesd, parse it and act on it.
  */
-static ssize_t cachefiles_daemon_write(struct file *file,
-				       const char __user *_data,
-				       size_t datalen,
-				       loff_t *pos)
+static ssize_t cachefiles_daemon_do_write(struct file *file,
+					  const char __user *_data,
+					  size_t datalen,
+					  loff_t *pos,
+			const struct cachefiles_daemon_cmd *cmds)
 {
 	const struct cachefiles_daemon_cmd *cmd;
 	struct cachefiles_cache *cache = file->private_data;
@@ -261,7 +262,7 @@ static ssize_t cachefiles_daemon_write(struct file *file,
 	}
 
 	/* run the appropriate command handler */
-	for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++)
+	for (cmd = cmds; cmd->name[0]; cmd++)
 		if (strcmp(cmd->name, data) == 0)
 			goto found_command;
 
@@ -284,6 +285,15 @@ static ssize_t cachefiles_daemon_write(struct file *file,
 	goto error;
 }
 
+static ssize_t cachefiles_daemon_write(struct file *file,
+				       const char __user *_data,
+				       size_t datalen,
+				       loff_t *pos)
+{
+	return cachefiles_daemon_do_write(file, _data, datalen, pos,
+					  cachefiles_daemon_cmds);
+}
+
 /*
  * Poll for culling state
  * - use EPOLLOUT to indicate culling state
-- 
2.27.0