linux-kernel - [PATCH v5 7/11] 9p: Add additional debug flags and open modes

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Message-Id: <20230227025310.24793-1-ericvh@kernel.org>
Date:   Mon, 27 Feb 2023 02:53:10 +0000
From:   Eric Van Hensbergen <ericvh@...nel.org>
To:     asmadeus@...ewreck.org
Cc:     ericvh@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux_oss@...debyte.com,
        lucho@...kov.net, rminnich@...il.com,
        v9fs-developer@...ts.sourceforge.net
Subject: [PATCH v5 7/11] 9p: Add additional debug flags and open modes

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@...nel.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