Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1093 insertions, 0 deletions

diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c
new file mode 100644
index 000000000..5df8d9323
--- /dev/null
+++ b/fs/smb/client/cifs_debug.c
@@ -0,0 +1,1093 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ *   Copyright (C) International Business Machines  Corp., 2000,2005
+ *
+ *   Modified by Steve French (sfrench@us.ibm.com)
+ */
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifsfs.h"
+#include "fs_context.h"
+#ifdef CONFIG_CIFS_DFS_UPCALL
+#include "dfs_cache.h"
+#endif
+#ifdef CONFIG_CIFS_SMB_DIRECT
+#include "smbdirect.h"
+#endif
+#include "cifs_swn.h"
+
+void
+cifs_dump_mem(char *label, void *data, int length)
+{
+	pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
+	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
+		       data, length, true);
+}
+
+void cifs_dump_detail(void *buf, struct TCP_Server_Info *server)
+{
+#ifdef CONFIG_CIFS_DEBUG2
+	struct smb_hdr *smb = buf;
+
+	cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d Wct: %d\n",
+		 smb->Command, smb->Status.CifsError, smb->Flags,
+		 smb->Flags2, smb->Mid, smb->Pid, smb->WordCount);
+	if (!server->ops->check_message(buf, server->total_read, server)) {
+		cifs_dbg(VFS, "smb buf %p len %u\n", smb,
+			 server->ops->calc_smb_size(smb));
+	}
+#endif /* CONFIG_CIFS_DEBUG2 */
+}
+
+void cifs_dump_mids(struct TCP_Server_Info *server)
+{
+#ifdef CONFIG_CIFS_DEBUG2
+	struct mid_q_entry *mid_entry;
+
+	if (server == NULL)
+		return;
+
+	cifs_dbg(VFS, "Dump pending requests:\n");
+	spin_lock(&server->mid_lock);
+	list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
+		cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
+			 mid_entry->mid_state,
+			 le16_to_cpu(mid_entry->command),
+			 mid_entry->pid,
+			 mid_entry->callback_data,
+			 mid_entry->mid);
+#ifdef CONFIG_CIFS_STATS2
+		cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
+			 mid_entry->large_buf,
+			 mid_entry->resp_buf,
+			 mid_entry->when_received,
+			 jiffies);
+#endif /* STATS2 */
+		cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
+			 mid_entry->multiRsp, mid_entry->multiEnd);
+		if (mid_entry->resp_buf) {
+			cifs_dump_detail(mid_entry->resp_buf, server);
+			cifs_dump_mem("existing buf: ",
+				mid_entry->resp_buf, 62);
+		}
+	}
+	spin_unlock(&server->mid_lock);
+#endif /* CONFIG_CIFS_DEBUG2 */
+}
+
+#ifdef CONFIG_PROC_FS
+static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
+{
+	__u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
+
+	seq_printf(m, "%s Mounts: %d ", tcon->tree_name, tcon->tc_count);
+	if (tcon->nativeFileSystem)
+		seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
+	seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
+		   le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
+		   le32_to_cpu(tcon->fsAttrInfo.Attributes),
+		   le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
+		   tcon->status);
+	if (dev_type == FILE_DEVICE_DISK)
+		seq_puts(m, " type: DISK ");
+	else if (dev_type == FILE_DEVICE_CD_ROM)
+		seq_puts(m, " type: CDROM ");
+	else
+		seq_printf(m, " type: %d ", dev_type);
+
+	seq_printf(m, "Serial Number: 0x%x", tcon->vol_serial_number);
+
+	if ((tcon->seal) ||
+	    (tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
+	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
+		seq_printf(m, " Encrypted");
+	if (tcon->nocase)
+		seq_printf(m, " nocase");
+	if (tcon->unix_ext)
+		seq_printf(m, " POSIX Extensions");
+	if (tcon->ses->server->ops->dump_share_caps)
+		tcon->ses->server->ops->dump_share_caps(m, tcon);
+	if (tcon->use_witness)
+		seq_puts(m, " Witness");
+	if (tcon->broken_sparse_sup)
+		seq_puts(m, " nosparse");
+	if (tcon->need_reconnect)
+		seq_puts(m, "\tDISCONNECTED ");
+	seq_putc(m, '\n');
+}
+
+static void
+cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
+{
+	struct TCP_Server_Info *server = chan->server;
+
+	seq_printf(m, "\n\n\t\tChannel: %d ConnectionId: 0x%llx"
+		   "\n\t\tNumber of credits: %d Dialect 0x%x"
+		   "\n\t\tTCP status: %d Instance: %d"
+		   "\n\t\tLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d"
+		   "\n\t\tIn Send: %d In MaxReq Wait: %d",
+		   i+1, server->conn_id,
+		   server->credits,
+		   server->dialect,
+		   server->tcpStatus,
+		   server->reconnect_instance,
+		   server->srv_count,
+		   server->sec_mode,
+		   in_flight(server),
+		   atomic_read(&server->in_send),
+		   atomic_read(&server->num_waiters));
+}
+
+static void
+cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
+{
+	struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
+	struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
+
+	seq_printf(m, "\tSpeed: %zu bps\n", iface->speed);
+	seq_puts(m, "\t\tCapabilities: ");
+	if (iface->rdma_capable)
+		seq_puts(m, "rdma ");
+	if (iface->rss_capable)
+		seq_puts(m, "rss ");
+	seq_putc(m, '\n');
+	if (iface->sockaddr.ss_family == AF_INET)
+		seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
+	else if (iface->sockaddr.ss_family == AF_INET6)
+		seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
+	if (!iface->is_active)
+		seq_puts(m, "\t\t[for-cleanup]\n");
+}
+
+static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
+{
+	struct TCP_Server_Info *server;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+	struct cifsFileInfo *cfile;
+
+	seq_puts(m, "# Version:1\n");
+	seq_puts(m, "# Format:\n");
+	seq_puts(m, "# <tree id> <ses id> <persistent fid> <flags> <count> <pid> <uid>");
+#ifdef CONFIG_CIFS_DEBUG2
+	seq_printf(m, " <filename> <mid>\n");
+#else
+	seq_printf(m, " <filename>\n");
+#endif /* CIFS_DEBUG2 */
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+				spin_lock(&tcon->open_file_lock);
+				list_for_each_entry(cfile, &tcon->openFileList, tlist) {
+					seq_printf(m,
+						"0x%x 0x%llx 0x%llx 0x%x %d %d %d %pd",
+						tcon->tid,
+						ses->Suid,
+						cfile->fid.persistent_fid,
+						cfile->f_flags,
+						cfile->count,
+						cfile->pid,
+						from_kuid(&init_user_ns, cfile->uid),
+						cfile->dentry);
+#ifdef CONFIG_CIFS_DEBUG2
+					seq_printf(m, " %llu\n", cfile->fid.mid);
+#else
+					seq_printf(m, "\n");
+#endif /* CIFS_DEBUG2 */
+				}
+				spin_unlock(&tcon->open_file_lock);
+			}
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+	seq_putc(m, '\n');
+	return 0;
+}
+
+static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
+{
+	struct mid_q_entry *mid_entry;
+	struct TCP_Server_Info *server;
+	struct TCP_Server_Info *chan_server;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+	struct cifs_server_iface *iface;
+	size_t iface_weight = 0, iface_min_speed = 0;
+	struct cifs_server_iface *last_iface = NULL;
+	int c, i, j;
+
+	seq_puts(m,
+		    "Display Internal CIFS Data Structures for Debugging\n"
+		    "---------------------------------------------------\n");
+	seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
+	seq_printf(m, "Features:");
+#ifdef CONFIG_CIFS_DFS_UPCALL
+	seq_printf(m, " DFS");
+#endif
+#ifdef CONFIG_CIFS_FSCACHE
+	seq_printf(m, ",FSCACHE");
+#endif
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	seq_printf(m, ",SMB_DIRECT");
+#endif
+#ifdef CONFIG_CIFS_STATS2
+	seq_printf(m, ",STATS2");
+#else
+	seq_printf(m, ",STATS");
+#endif
+#ifdef CONFIG_CIFS_DEBUG2
+	seq_printf(m, ",DEBUG2");
+#elif defined(CONFIG_CIFS_DEBUG)
+	seq_printf(m, ",DEBUG");
+#endif
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+	seq_printf(m, ",ALLOW_INSECURE_LEGACY");
+#endif
+#ifdef CONFIG_CIFS_POSIX
+	seq_printf(m, ",CIFS_POSIX");
+#endif
+#ifdef CONFIG_CIFS_UPCALL
+	seq_printf(m, ",UPCALL(SPNEGO)");
+#endif
+#ifdef CONFIG_CIFS_XATTR
+	seq_printf(m, ",XATTR");
+#endif
+	seq_printf(m, ",ACL");
+#ifdef CONFIG_CIFS_SWN_UPCALL
+	seq_puts(m, ",WITNESS");
+#endif
+	seq_putc(m, '\n');
+	seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
+	seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
+
+	seq_printf(m, "\nServers: ");
+
+	c = 0;
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+		/* channel info will be printed as a part of sessions below */
+		if (CIFS_SERVER_IS_CHAN(server))
+			continue;
+
+		c++;
+		seq_printf(m, "\n%d) ConnectionId: 0x%llx ",
+			c, server->conn_id);
+
+		spin_lock(&server->srv_lock);
+		if (server->hostname)
+			seq_printf(m, "Hostname: %s ", server->hostname);
+		spin_unlock(&server->srv_lock);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+		if (!server->rdma)
+			goto skip_rdma;
+
+		if (!server->smbd_conn) {
+			seq_printf(m, "\nSMBDirect transport not available");
+			goto skip_rdma;
+		}
+
+		seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
+			"transport status: %x",
+			server->smbd_conn->protocol,
+			server->smbd_conn->transport_status);
+		seq_printf(m, "\nConn receive_credit_max: %x "
+			"send_credit_target: %x max_send_size: %x",
+			server->smbd_conn->receive_credit_max,
+			server->smbd_conn->send_credit_target,
+			server->smbd_conn->max_send_size);
+		seq_printf(m, "\nConn max_fragmented_recv_size: %x "
+			"max_fragmented_send_size: %x max_receive_size:%x",
+			server->smbd_conn->max_fragmented_recv_size,
+			server->smbd_conn->max_fragmented_send_size,
+			server->smbd_conn->max_receive_size);
+		seq_printf(m, "\nConn keep_alive_interval: %x "
+			"max_readwrite_size: %x rdma_readwrite_threshold: %x",
+			server->smbd_conn->keep_alive_interval,
+			server->smbd_conn->max_readwrite_size,
+			server->smbd_conn->rdma_readwrite_threshold);
+		seq_printf(m, "\nDebug count_get_receive_buffer: %x "
+			"count_put_receive_buffer: %x count_send_empty: %x",
+			server->smbd_conn->count_get_receive_buffer,
+			server->smbd_conn->count_put_receive_buffer,
+			server->smbd_conn->count_send_empty);
+		seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
+			"count_enqueue_reassembly_queue: %x "
+			"count_dequeue_reassembly_queue: %x "
+			"fragment_reassembly_remaining: %x "
+			"reassembly_data_length: %x "
+			"reassembly_queue_length: %x",
+			server->smbd_conn->count_reassembly_queue,
+			server->smbd_conn->count_enqueue_reassembly_queue,
+			server->smbd_conn->count_dequeue_reassembly_queue,
+			server->smbd_conn->fragment_reassembly_remaining,
+			server->smbd_conn->reassembly_data_length,
+			server->smbd_conn->reassembly_queue_length);
+		seq_printf(m, "\nCurrent Credits send_credits: %x "
+			"receive_credits: %x receive_credit_target: %x",
+			atomic_read(&server->smbd_conn->send_credits),
+			atomic_read(&server->smbd_conn->receive_credits),
+			server->smbd_conn->receive_credit_target);
+		seq_printf(m, "\nPending send_pending: %x ",
+			atomic_read(&server->smbd_conn->send_pending));
+		seq_printf(m, "\nReceive buffers count_receive_queue: %x "
+			"count_empty_packet_queue: %x",
+			server->smbd_conn->count_receive_queue,
+			server->smbd_conn->count_empty_packet_queue);
+		seq_printf(m, "\nMR responder_resources: %x "
+			"max_frmr_depth: %x mr_type: %x",
+			server->smbd_conn->responder_resources,
+			server->smbd_conn->max_frmr_depth,
+			server->smbd_conn->mr_type);
+		seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
+			atomic_read(&server->smbd_conn->mr_ready_count),
+			atomic_read(&server->smbd_conn->mr_used_count));
+skip_rdma:
+#endif
+		seq_printf(m, "\nNumber of credits: %d Dialect 0x%x",
+			server->credits,  server->dialect);
+		if (server->compress_algorithm == SMB3_COMPRESS_LZNT1)
+			seq_printf(m, " COMPRESS_LZNT1");
+		else if (server->compress_algorithm == SMB3_COMPRESS_LZ77)
+			seq_printf(m, " COMPRESS_LZ77");
+		else if (server->compress_algorithm == SMB3_COMPRESS_LZ77_HUFF)
+			seq_printf(m, " COMPRESS_LZ77_HUFF");
+		if (server->sign)
+			seq_printf(m, " signed");
+		if (server->posix_ext_supported)
+			seq_printf(m, " posix");
+		if (server->nosharesock)
+			seq_printf(m, " nosharesock");
+
+		if (server->rdma)
+			seq_printf(m, "\nRDMA ");
+		seq_printf(m, "\nTCP status: %d Instance: %d"
+				"\nLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d",
+				server->tcpStatus,
+				server->reconnect_instance,
+				server->srv_count,
+				server->sec_mode, in_flight(server));
+
+		seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
+				atomic_read(&server->in_send),
+				atomic_read(&server->num_waiters));
+
+		seq_printf(m, "\n\n\tSessions: ");
+		i = 0;
+		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+			spin_lock(&ses->ses_lock);
+			if (ses->ses_status == SES_EXITING) {
+				spin_unlock(&ses->ses_lock);
+				continue;
+			}
+			i++;
+			if ((ses->serverDomain == NULL) ||
+				(ses->serverOS == NULL) ||
+				(ses->serverNOS == NULL)) {
+				seq_printf(m, "\n\t%d) Address: %s Uses: %d Capability: 0x%x\tSession Status: %d ",
+					i, ses->ip_addr, ses->ses_count,
+					ses->capabilities, ses->ses_status);
+				if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
+					seq_printf(m, "Guest ");
+				else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
+					seq_printf(m, "Anonymous ");
+			} else {
+				seq_printf(m,
+				    "\n\t%d) Name: %s  Domain: %s Uses: %d OS: %s "
+				    "\n\tNOS: %s\tCapability: 0x%x"
+					"\n\tSMB session status: %d ",
+				i, ses->ip_addr, ses->serverDomain,
+				ses->ses_count, ses->serverOS, ses->serverNOS,
+				ses->capabilities, ses->ses_status);
+			}
+			spin_unlock(&ses->ses_lock);
+
+			seq_printf(m, "\n\tSecurity type: %s ",
+				get_security_type_str(server->ops->select_sectype(server, ses->sectype)));
+
+			/* dump session id helpful for use with network trace */
+			seq_printf(m, " SessionId: 0x%llx", ses->Suid);
+			if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
+				seq_puts(m, " encrypted");
+			if (ses->sign)
+				seq_puts(m, " signed");
+
+			seq_printf(m, "\n\tUser: %d Cred User: %d",
+				   from_kuid(&init_user_ns, ses->linux_uid),
+				   from_kuid(&init_user_ns, ses->cred_uid));
+
+			spin_lock(&ses->chan_lock);
+			if (CIFS_CHAN_NEEDS_RECONNECT(ses, 0))
+				seq_puts(m, "\tPrimary channel: DISCONNECTED ");
+			if (CIFS_CHAN_IN_RECONNECT(ses, 0))
+				seq_puts(m, "\t[RECONNECTING] ");
+
+			if (ses->chan_count > 1) {
+				seq_printf(m, "\n\n\tExtra Channels: %zu ",
+					   ses->chan_count-1);
+				for (j = 1; j < ses->chan_count; j++) {
+					cifs_dump_channel(m, j, &ses->chans[j]);
+					if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
+						seq_puts(m, "\tDISCONNECTED ");
+					if (CIFS_CHAN_IN_RECONNECT(ses, j))
+						seq_puts(m, "\t[RECONNECTING] ");
+				}
+			}
+			spin_unlock(&ses->chan_lock);
+
+			seq_puts(m, "\n\n\tShares: ");
+			j = 0;
+
+			seq_printf(m, "\n\t%d) IPC: ", j);
+			if (ses->tcon_ipc)
+				cifs_debug_tcon(m, ses->tcon_ipc);
+			else
+				seq_puts(m, "none\n");
+
+			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+				++j;
+				seq_printf(m, "\n\t%d) ", j);
+				cifs_debug_tcon(m, tcon);
+			}
+
+			spin_lock(&ses->iface_lock);
+			if (ses->iface_count)
+				seq_printf(m, "\n\n\tServer interfaces: %zu"
+					   "\tLast updated: %lu seconds ago",
+					   ses->iface_count,
+					   (jiffies - ses->iface_last_update) / HZ);
+
+			last_iface = list_last_entry(&ses->iface_list,
+						     struct cifs_server_iface,
+						     iface_head);
+			iface_min_speed = last_iface->speed;
+
+			j = 0;
+			list_for_each_entry(iface, &ses->iface_list,
+						 iface_head) {
+				seq_printf(m, "\n\t%d)", ++j);
+				cifs_dump_iface(m, iface);
+
+				iface_weight = iface->speed / iface_min_speed;
+				seq_printf(m, "\t\tWeight (cur,total): (%zu,%zu)"
+					   "\n\t\tAllocated channels: %u\n",
+					   iface->weight_fulfilled,
+					   iface_weight,
+					   iface->num_channels);
+
+				if (is_ses_using_iface(ses, iface))
+					seq_puts(m, "\t\t[CONNECTED]\n");
+			}
+			spin_unlock(&ses->iface_lock);
+
+			seq_puts(m, "\n\n\tMIDs: ");
+			spin_lock(&ses->chan_lock);
+			for (j = 0; j < ses->chan_count; j++) {
+				chan_server = ses->chans[j].server;
+				if (!chan_server)
+					continue;
+
+				if (list_empty(&chan_server->pending_mid_q))
+					continue;
+
+				seq_printf(m, "\n\tServer ConnectionId: 0x%llx",
+					   chan_server->conn_id);
+				spin_lock(&chan_server->mid_lock);
+				list_for_each_entry(mid_entry, &chan_server->pending_mid_q, qhead) {
+					seq_printf(m, "\n\t\tState: %d com: %d pid: %d cbdata: %p mid %llu",
+						   mid_entry->mid_state,
+						   le16_to_cpu(mid_entry->command),
+						   mid_entry->pid,
+						   mid_entry->callback_data,
+						   mid_entry->mid);
+				}
+				spin_unlock(&chan_server->mid_lock);
+			}
+			spin_unlock(&ses->chan_lock);
+			seq_puts(m, "\n--\n");
+		}
+		if (i == 0)
+			seq_printf(m, "\n\t\t[NONE]");
+	}
+	if (c == 0)
+		seq_printf(m, "\n\t[NONE]");
+
+	spin_unlock(&cifs_tcp_ses_lock);
+	seq_putc(m, '\n');
+	cifs_swn_dump(m);
+
+	/* BB add code to dump additional info such as TCP session info now */
+	return 0;
+}
+
+static ssize_t cifs_stats_proc_write(struct file *file,
+		const char __user *buffer, size_t count, loff_t *ppos)
+{
+	bool bv;
+	int rc;
+	struct TCP_Server_Info *server;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+
+	rc = kstrtobool_from_user(buffer, count, &bv);
+	if (rc == 0) {
+#ifdef CONFIG_CIFS_STATS2
+		int i;
+
+		atomic_set(&total_buf_alloc_count, 0);
+		atomic_set(&total_small_buf_alloc_count, 0);
+#endif /* CONFIG_CIFS_STATS2 */
+		atomic_set(&tcpSesReconnectCount, 0);
+		atomic_set(&tconInfoReconnectCount, 0);
+
+		spin_lock(&GlobalMid_Lock);
+		GlobalMaxActiveXid = 0;
+		GlobalCurrentXid = 0;
+		spin_unlock(&GlobalMid_Lock);
+		spin_lock(&cifs_tcp_ses_lock);
+		list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+			server->max_in_flight = 0;
+#ifdef CONFIG_CIFS_STATS2
+			for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
+				atomic_set(&server->num_cmds[i], 0);
+				atomic_set(&server->smb2slowcmd[i], 0);
+				server->time_per_cmd[i] = 0;
+				server->slowest_cmd[i] = 0;
+				server->fastest_cmd[0] = 0;
+			}
+#endif /* CONFIG_CIFS_STATS2 */
+			list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+				list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+					atomic_set(&tcon->num_smbs_sent, 0);
+					spin_lock(&tcon->stat_lock);
+					tcon->bytes_read = 0;
+					tcon->bytes_written = 0;
+					spin_unlock(&tcon->stat_lock);
+					if (server->ops->clear_stats)
+						server->ops->clear_stats(tcon);
+				}
+			}
+		}
+		spin_unlock(&cifs_tcp_ses_lock);
+	} else {
+		return rc;
+	}
+
+	return count;
+}
+
+static int cifs_stats_proc_show(struct seq_file *m, void *v)
+{
+	int i;
+#ifdef CONFIG_CIFS_STATS2
+	int j;
+#endif /* STATS2 */
+	struct TCP_Server_Info *server;
+	struct cifs_ses *ses;
+	struct cifs_tcon *tcon;
+
+	seq_printf(m, "Resources in use\nCIFS Session: %d\n",
+			sesInfoAllocCount.counter);
+	seq_printf(m, "Share (unique mount targets): %d\n",
+			tconInfoAllocCount.counter);
+	seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
+			buf_alloc_count.counter,
+			cifs_min_rcv + tcpSesAllocCount.counter);
+	seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
+			small_buf_alloc_count.counter, cifs_min_small);
+#ifdef CONFIG_CIFS_STATS2
+	seq_printf(m, "Total Large %d Small %d Allocations\n",
+				atomic_read(&total_buf_alloc_count),
+				atomic_read(&total_small_buf_alloc_count));
+#endif /* CONFIG_CIFS_STATS2 */
+
+	seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&mid_count));
+	seq_printf(m,
+		"\n%d session %d share reconnects\n",
+		tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
+
+	seq_printf(m,
+		"Total vfs operations: %d maximum at one time: %d\n",
+		GlobalCurrentXid, GlobalMaxActiveXid);
+
+	i = 0;
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+		seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
+#ifdef CONFIG_CIFS_STATS2
+		seq_puts(m, "\nTotal time spent processing by command. Time ");
+		seq_printf(m, "units are jiffies (%d per second)\n", HZ);
+		seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
+		seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
+		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
+			seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
+				atomic_read(&server->num_cmds[j]),
+				server->time_per_cmd[j],
+				server->fastest_cmd[j],
+				server->slowest_cmd[j]);
+		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
+			if (atomic_read(&server->smb2slowcmd[j])) {
+				spin_lock(&server->srv_lock);
+				seq_printf(m, "  %d slow responses from %s for command %d\n",
+					atomic_read(&server->smb2slowcmd[j]),
+					server->hostname, j);
+				spin_unlock(&server->srv_lock);
+			}
+#endif /* STATS2 */
+		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+				i++;
+				seq_printf(m, "\n%d) %s", i, tcon->tree_name);
+				if (tcon->need_reconnect)
+					seq_puts(m, "\tDISCONNECTED ");
+				seq_printf(m, "\nSMBs: %d",
+					   atomic_read(&tcon->num_smbs_sent));
+				if (server->ops->print_stats)
+					server->ops->print_stats(m, tcon);
+			}
+		}
+	}
+	spin_unlock(&cifs_tcp_ses_lock);
+
+	seq_putc(m, '\n');
+	return 0;
+}
+
+static int cifs_stats_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifs_stats_proc_show, NULL);
+}
+
+static const struct proc_ops cifs_stats_proc_ops = {
+	.proc_open	= cifs_stats_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= cifs_stats_proc_write,
+};
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+#define PROC_FILE_DEFINE(name) \
+static ssize_t name##_write(struct file *file, const char __user *buffer, \
+	size_t count, loff_t *ppos) \
+{ \
+	int rc; \
+	rc = kstrtoint_from_user(buffer, count, 10, & name); \
+	if (rc) \
+		return rc; \
+	return count; \
+} \
+static int name##_proc_show(struct seq_file *m, void *v) \
+{ \
+	seq_printf(m, "%d\n", name ); \
+	return 0; \
+} \
+static int name##_open(struct inode *inode, struct file *file) \
+{ \
+	return single_open(file, name##_proc_show, NULL); \
+} \
+\
+static const struct proc_ops cifs_##name##_proc_fops = { \
+	.proc_open	= name##_open, \
+	.proc_read	= seq_read, \
+	.proc_lseek	= seq_lseek, \
+	.proc_release	= single_release, \
+	.proc_write	= name##_write, \
+}
+
+PROC_FILE_DEFINE(rdma_readwrite_threshold);
+PROC_FILE_DEFINE(smbd_max_frmr_depth);
+PROC_FILE_DEFINE(smbd_keep_alive_interval);
+PROC_FILE_DEFINE(smbd_max_receive_size);
+PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
+PROC_FILE_DEFINE(smbd_max_send_size);
+PROC_FILE_DEFINE(smbd_send_credit_target);
+PROC_FILE_DEFINE(smbd_receive_credit_max);
+#endif
+
+static struct proc_dir_entry *proc_fs_cifs;
+static const struct proc_ops cifsFYI_proc_ops;
+static const struct proc_ops cifs_lookup_cache_proc_ops;
+static const struct proc_ops traceSMB_proc_ops;
+static const struct proc_ops cifs_security_flags_proc_ops;
+static const struct proc_ops cifs_linux_ext_proc_ops;
+static const struct proc_ops cifs_mount_params_proc_ops;
+
+void
+cifs_proc_init(void)
+{
+	proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
+	if (proc_fs_cifs == NULL)
+		return;
+
+	proc_create_single("DebugData", 0, proc_fs_cifs,
+			cifs_debug_data_proc_show);
+
+	proc_create_single("open_files", 0400, proc_fs_cifs,
+			cifs_debug_files_proc_show);
+
+	proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_ops);
+	proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_ops);
+	proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_ops);
+	proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
+		    &cifs_linux_ext_proc_ops);
+	proc_create("SecurityFlags", 0644, proc_fs_cifs,
+		    &cifs_security_flags_proc_ops);
+	proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
+		    &cifs_lookup_cache_proc_ops);
+
+	proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);
+
+#ifdef CONFIG_CIFS_DFS_UPCALL
+	proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);
+#endif
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
+		&cifs_rdma_readwrite_threshold_proc_fops);
+	proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
+		&cifs_smbd_max_frmr_depth_proc_fops);
+	proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
+		&cifs_smbd_keep_alive_interval_proc_fops);
+	proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
+		&cifs_smbd_max_receive_size_proc_fops);
+	proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
+		&cifs_smbd_max_fragmented_recv_size_proc_fops);
+	proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
+		&cifs_smbd_max_send_size_proc_fops);
+	proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
+		&cifs_smbd_send_credit_target_proc_fops);
+	proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
+		&cifs_smbd_receive_credit_max_proc_fops);
+#endif
+}
+
+void
+cifs_proc_clean(void)
+{
+	if (proc_fs_cifs == NULL)
+		return;
+
+	remove_proc_entry("DebugData", proc_fs_cifs);
+	remove_proc_entry("open_files", proc_fs_cifs);
+	remove_proc_entry("cifsFYI", proc_fs_cifs);
+	remove_proc_entry("traceSMB", proc_fs_cifs);
+	remove_proc_entry("Stats", proc_fs_cifs);
+	remove_proc_entry("SecurityFlags", proc_fs_cifs);
+	remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
+	remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
+	remove_proc_entry("mount_params", proc_fs_cifs);
+
+#ifdef CONFIG_CIFS_DFS_UPCALL
+	remove_proc_entry("dfscache", proc_fs_cifs);
+#endif
+#ifdef CONFIG_CIFS_SMB_DIRECT
+	remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
+	remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
+	remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
+	remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
+	remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
+	remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
+	remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
+	remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
+#endif
+	remove_proc_entry("fs/cifs", NULL);
+}
+
+static int cifsFYI_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%d\n", cifsFYI);
+	return 0;
+}
+
+static int cifsFYI_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifsFYI_proc_show, NULL);
+}
+
+static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
+		size_t count, loff_t *ppos)
+{
+	char c[2] = { '\0' };
+	bool bv;
+	int rc;
+
+	rc = get_user(c[0], buffer);
+	if (rc)
+		return rc;
+	if (strtobool(c, &bv) == 0)
+		cifsFYI = bv;
+	else if ((c[0] > '1') && (c[0] <= '9'))
+		cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
+	else
+		return -EINVAL;
+
+	return count;
+}
+
+static const struct proc_ops cifsFYI_proc_ops = {
+	.proc_open	= cifsFYI_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= cifsFYI_proc_write,
+};
+
+static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%d\n", linuxExtEnabled);
+	return 0;
+}
+
+static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifs_linux_ext_proc_show, NULL);
+}
+
+static ssize_t cifs_linux_ext_proc_write(struct file *file,
+		const char __user *buffer, size_t count, loff_t *ppos)
+{
+	int rc;
+
+	rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
+	if (rc)
+		return rc;
+
+	return count;
+}
+
+static const struct proc_ops cifs_linux_ext_proc_ops = {
+	.proc_open	= cifs_linux_ext_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= cifs_linux_ext_proc_write,
+};
+
+static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%d\n", lookupCacheEnabled);
+	return 0;
+}
+
+static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifs_lookup_cache_proc_show, NULL);
+}
+
+static ssize_t cifs_lookup_cache_proc_write(struct file *file,
+		const char __user *buffer, size_t count, loff_t *ppos)
+{
+	int rc;
+
+	rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
+	if (rc)
+		return rc;
+
+	return count;
+}
+
+static const struct proc_ops cifs_lookup_cache_proc_ops = {
+	.proc_open	= cifs_lookup_cache_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= cifs_lookup_cache_proc_write,
+};
+
+static int traceSMB_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%d\n", traceSMB);
+	return 0;
+}
+
+static int traceSMB_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, traceSMB_proc_show, NULL);
+}
+
+static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
+		size_t count, loff_t *ppos)
+{
+	int rc;
+
+	rc = kstrtobool_from_user(buffer, count, &traceSMB);
+	if (rc)
+		return rc;
+
+	return count;
+}
+
+static const struct proc_ops traceSMB_proc_ops = {
+	.proc_open	= traceSMB_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= traceSMB_proc_write,
+};
+
+static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "0x%x\n", global_secflags);
+	return 0;
+}
+
+static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifs_security_flags_proc_show, NULL);
+}
+
+/*
+ * Ensure that if someone sets a MUST flag, that we disable all other MAY
+ * flags except for the ones corresponding to the given MUST flag. If there are
+ * multiple MUST flags, then try to prefer more secure ones.
+ */
+static void
+cifs_security_flags_handle_must_flags(unsigned int *flags)
+{
+	unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
+
+	if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
+		*flags = CIFSSEC_MUST_KRB5;
+	else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
+		*flags = CIFSSEC_MUST_NTLMSSP;
+	else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
+		*flags = CIFSSEC_MUST_NTLMV2;
+
+	*flags |= signflags;
+}
+
+static ssize_t cifs_security_flags_proc_write(struct file *file,
+		const char __user *buffer, size_t count, loff_t *ppos)
+{
+	int rc;
+	unsigned int flags;
+	char flags_string[12];
+	bool bv;
+
+	if ((count < 1) || (count > 11))
+		return -EINVAL;
+
+	memset(flags_string, 0, 12);
+
+	if (copy_from_user(flags_string, buffer, count))
+		return -EFAULT;
+
+	if (count < 3) {
+		/* single char or single char followed by null */
+		if (strtobool(flags_string, &bv) == 0) {
+			global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
+			return count;
+		} else if (!isdigit(flags_string[0])) {
+			cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
+					flags_string);
+			return -EINVAL;
+		}
+	}
+
+	/* else we have a number */
+	rc = kstrtouint(flags_string, 0, &flags);
+	if (rc) {
+		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
+				flags_string);
+		return rc;
+	}
+
+	cifs_dbg(FYI, "sec flags 0x%x\n", flags);
+
+	if (flags == 0)  {
+		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
+		return -EINVAL;
+	}
+
+	if (flags & ~CIFSSEC_MASK) {
+		cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
+			 flags & ~CIFSSEC_MASK);
+		return -EINVAL;
+	}
+
+	cifs_security_flags_handle_must_flags(&flags);
+
+	/* flags look ok - update the global security flags for cifs module */
+	global_secflags = flags;
+	if (global_secflags & CIFSSEC_MUST_SIGN) {
+		/* requiring signing implies signing is allowed */
+		global_secflags |= CIFSSEC_MAY_SIGN;
+		cifs_dbg(FYI, "packet signing now required\n");
+	} else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
+		cifs_dbg(FYI, "packet signing disabled\n");
+	}
+	/* BB should we turn on MAY flags for other MUST options? */
+	return count;
+}
+
+static const struct proc_ops cifs_security_flags_proc_ops = {
+	.proc_open	= cifs_security_flags_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= cifs_security_flags_proc_write,
+};
+
+/* To make it easier to debug, can help to show mount params */
+static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
+{
+	const struct fs_parameter_spec *p;
+	const char *type;
+
+	for (p = smb3_fs_parameters; p->name; p++) {
+		/* cannot use switch with pointers... */
+		if (!p->type) {
+			if (p->flags == fs_param_neg_with_no)
+				type = "noflag";
+			else
+				type = "flag";
+		} else if (p->type == fs_param_is_bool)
+			type = "bool";
+		else if (p->type == fs_param_is_u32)
+			type = "u32";
+		else if (p->type == fs_param_is_u64)
+			type = "u64";
+		else if (p->type == fs_param_is_string)
+			type = "string";
+		else
+			type = "unknown";
+
+		seq_printf(m, "%s:%s\n", p->name, type);
+	}
+
+	return 0;
+}
+
+static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, cifs_mount_params_proc_show, NULL);
+}
+
+static const struct proc_ops cifs_mount_params_proc_ops = {
+	.proc_open	= cifs_mount_params_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	/* No need for write for now */
+	/* .proc_write	= cifs_mount_params_proc_write, */
+};
+
+#else
+inline void cifs_proc_init(void)
+{
+}
+
+inline void cifs_proc_clean(void)
+{
+}
+#endif /* PROC_FS */