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

Eric Van Hensbergen
2023-02-27T02:53:30Z

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