From 072a28c8907c841f7d4b56c78bce46d3ee211e73 Mon Sep 17 00:00:00 2001 From: Shyam Prasad N Date: Wed, 8 Mar 2023 12:11:31 +0000 Subject: [PATCH] cifs: do not poll server interfaces too regularly We have the server interface list hanging off the tcon structure today for reasons unknown. So each tcon which is connected to a file server can query them separately, which is really unnecessary. To avoid this, in the query function, we will check the time of last update of the interface list, and avoid querying the server if it is within a certain range. Signed-off-by: Shyam Prasad N Reviewed-by: Paulo Alcantara (SUSE) Cc: stable@vger.kernel.org Signed-off-by: Steve French --- fs/cifs/smb2ops.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 6dfb865ee9d7..96ca09d885a2 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -530,6 +530,14 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, p = buf; spin_lock(&ses->iface_lock); + /* do not query too frequently, this time with lock held */ + if (ses->iface_last_update && + time_before(jiffies, ses->iface_last_update + + (SMB_INTERFACE_POLL_INTERVAL * HZ))) { + spin_unlock(&ses->iface_lock); + return 0; + } + /* * Go through iface_list and do kref_put to remove * any unused ifaces. ifaces in use will be removed @@ -696,6 +704,12 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon, bool in_ struct network_interface_info_ioctl_rsp *out_buf = NULL; struct cifs_ses *ses = tcon->ses; + /* do not query too frequently */ + if (ses->iface_last_update && + time_before(jiffies, ses->iface_last_update + + (SMB_INTERFACE_POLL_INTERVAL * HZ))) + return 0; + rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_QUERY_NETWORK_INTERFACE_INFO, NULL /* no data input */, 0 /* no data input */,