From:   Eric Van Hensbergen <ericvh@kernel.org>
To:     asmadeus@codewreck.org
Cc:     ericvh@kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux_oss@crudebyte.com,
        lucho@ionkov.net, rminnich@gmail.com,
        v9fs-developer@lists.sourceforge.net
Subject: [PATCH v5 7/11] 9p: Add additional debug flags and open modes
Date:   Mon, 27 Feb 2023 02:53:10 +0000
Message-Id: <20230227025310.24793-1-ericvh@kernel.org>
In-Reply-To: <Y/CGvTCyhjFITkFs@codewreck.org>
References: <Y/CGvTCyhjFITkFs@codewreck.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
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Add some additional debug flags to assist with debugging
cache changes.  Also add some additional open modes so we
can track cache state in fids more directly.

Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
---
 include/net/9p/9p.h | 6 ++++++
 net/9p/client.c     | 8 ++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 429adf6be29c..60cad0d200a4 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -42,6 +42,8 @@ enum p9_debug_flags {
 	P9_DEBUG_PKT =		(1<<10),
 	P9_DEBUG_FSC =		(1<<11),
 	P9_DEBUG_VPKT =		(1<<12),
+	P9_DEBUG_CACHE =	(1<<13),
+	P9_DEBUG_MMAP =		(1<<14),
 };
 
 #ifdef CONFIG_NET_9P_DEBUG
@@ -213,6 +215,10 @@ enum p9_open_mode_t {
 	P9_ORCLOSE = 0x40,
 	P9_OAPPEND = 0x80,
 	P9_OEXCL = 0x1000,
+	P9L_MODE_MASK = 0x1FFF, /* don't send anything under this to server */
+	P9L_DIRECT = 0x2000, /* cache disabled */
+	P9L_NOWRITECACHE = 0x4000, /* no write caching  */
+	P9L_LOOSE = 0x8000, /* loose cache */
 };
 
 /**
diff --git a/net/9p/client.c b/net/9p/client.c
index 2adcb5e7b0e2..a3340268ec8d 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1230,9 +1230,9 @@ int p9_client_open(struct p9_fid *fid, int mode)
 		return -EINVAL;
 
 	if (p9_is_proto_dotl(clnt))
-		req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
+		req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK);
 	else
-		req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
+		req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK);
 	if (IS_ERR(req)) {
 		err = PTR_ERR(req);
 		goto error;
@@ -1277,7 +1277,7 @@ int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
 		return -EINVAL;
 
 	req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
-			    mode, gid);
+			    mode & P9L_MODE_MASK, gid);
 	if (IS_ERR(req)) {
 		err = PTR_ERR(req);
 		goto error;
@@ -1321,7 +1321,7 @@ int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
 		return -EINVAL;
 
 	req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
-			    mode, extension);
+			    mode & P9L_MODE_MASK, extension);
 	if (IS_ERR(req)) {
 		err = PTR_ERR(req);
 		goto error;
-- 
2.37.2