From 5075e9f4e0461d4ce394c6e42338fae859bd926f Mon Sep 17 00:00:00 2001 From: Shyam Prasad N Date: Fri, 13 Oct 2023 11:33:21 +0000 Subject: [PATCH] cifs: handle when server starts supporting multichannel [ Upstream commit 705fc522fe9d58848c253ee0948567060f36e2a7 ] When the user mounts with multichannel option, but the server does not support it, there can be a time in future where it can be supported. With this change, such a case is handled. Signed-off-by: Shyam Prasad N Stable-dep-of: 78e727e58e54 ("cifs: update iface_last_update on each query-and-update") Signed-off-by: Sasha Levin --- fs/smb/client/cifsproto.h | 1 + fs/smb/client/connect.c | 3 +++ fs/smb/client/smb2pdu.c | 32 ++++++++++++++++++++++++++++++-- 3 files changed, 34 insertions(+), 2 deletions(-) diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h index 0eb62cc..4a28cff 100644 --- a/fs/smb/client/cifsproto.h +++ b/fs/smb/client/cifsproto.h @@ -132,6 +132,7 @@ extern int SendReceiveBlockingLock(const unsigned int xid, struct smb_hdr *in_buf, struct smb_hdr *out_buf, int *bytes_returned); + void cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server, bool all_channels); diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 2f5be7d..c0b1f30 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -128,6 +128,9 @@ static void smb2_query_server_interfaces(struct work_struct *work) */ rc = SMB3_request_interfaces(0, tcon, false); if (rc) { + if (rc == -EOPNOTSUPP) + return; + cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n", __func__, rc); } diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 0274ef6..288f220 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -163,6 +163,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, int rc = 0; struct nls_table *nls_codepage = NULL; struct cifs_ses *ses; + int xid; /* * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so @@ -307,17 +308,44 @@ skip_sess_setup: tcon->need_reopen_files = true; rc = cifs_tree_connect(0, tcon, nls_codepage); - mutex_unlock(&ses->session_mutex); cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); if (rc) { /* If sess reconnected but tcon didn't, something strange ... */ + mutex_unlock(&ses->session_mutex); cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc); goto out; } + if (!rc && + (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { + mutex_unlock(&ses->session_mutex); + + /* + * query server network interfaces, in case they change + */ + xid = get_xid(); + rc = SMB3_request_interfaces(xid, tcon, false); + free_xid(xid); + + if (rc) + cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n", + __func__, rc); + + if (ses->chan_max > ses->chan_count && + !SERVER_IS_CHAN(server)) { + if (ses->chan_count == 1) + cifs_server_dbg(VFS, "supports multichannel now\n"); + + cifs_try_adding_channels(ses); + } + } else { + mutex_unlock(&ses->session_mutex); + } + if (smb2_command != SMB2_INTERNAL_CMD) - mod_delayed_work(cifsiod_wq, &server->reconnect, 0); + if (mod_delayed_work(cifsiod_wq, &server->reconnect, 0)) + cifs_put_tcp_session(server, false); atomic_inc(&tconInfoReconnectCount); out: -- 2.7.4