Quelle  cifs_debug.c   Sprache: C

// 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/kstrtox.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <uapi/linux/ethtool.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"
#include "cached_dir.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_queue_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_queue_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_puts(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 ");
 spin_lock(&tcon->tc_lock);
 if (tcon->origin_fullpath) {
  seq_printf(m, "\n\tDFS origin fullpath: %s",
      tcon->origin_fullpath);
 }
 spin_unlock(&tcon->tc_lock);
 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;

 if (!server) {
  seq_printf(m, "\n\n\t\tChannel: %d DISABLED", i+1);
  return;
 }

 seq_printf(m, "\n\n\t\tChannel: %d ConnectionId: 0x%llx"
     "\n\t\tNumber of credits: %d,%d,%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->echo_credits,
     server->oplock_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));
#ifdef CONFIG_NET_NS
 if (server->net)
  seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
#endif /* NET_NS */

}

static inline const char *smb_speed_to_str(size_t bps)
{
 size_t mbps = bps / 1000 / 1000;

 switch (mbps) {
 case SPEED_10:
  return "10Mbps";
 case SPEED_100:
  return "100Mbps";
 case SPEED_1000:
  return "1Gbps";
 case SPEED_2500:
  return "2.5Gbps";
 case SPEED_5000:
  return "5Gbps";
 case SPEED_10000:
  return "10Gbps";
 case SPEED_14000:
  return "14Gbps";
 case SPEED_20000:
  return "20Gbps";
 case SPEED_25000:
  return "25Gbps";
 case SPEED_40000:
  return "40Gbps";
 case SPEED_50000:
  return "50Gbps";
 case SPEED_56000:
  return "56Gbps";
 case SPEED_100000:
  return "100Gbps";
 case SPEED_200000:
  return "200Gbps";
 case SPEED_400000:
  return "400Gbps";
 case SPEED_800000:
  return "800Gbps";
 default:
  return "Unknown";
 }
}

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: %s\n", smb_speed_to_str(iface->speed));
 seq_puts(m, "\t\tCapabilities: ");
 if (iface->rdma_capable)
  seq_puts(m, "rdma ");
 if (iface->rss_capable)
  seq_puts(m, "rss ");
 if (!iface->rdma_capable && !iface->rss_capable)
  seq_puts(m, "None");
 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, "# ");
#ifdef CONFIG_CIFS_DEBUG2
 seq_printf(m, " \n");
#else
 seq_printf(m, " \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) {
   if (cifs_ses_exiting(ses))
    continue;
   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_dirs_proc_show(struct seq_file *m, void *v)
{
 struct list_head *stmp, *tmp, *tmp1;
 struct TCP_Server_Info *server;
 struct cifs_ses *ses;
 struct cifs_tcon *tcon;
 struct cached_fids *cfids;
 struct cached_fid *cfid;
 LIST_HEAD(entry);

 seq_puts(m, "# Version:1\n");
 seq_puts(m, "# Format:\n");
 seq_puts(m, "# \n");

 spin_lock(&cifs_tcp_ses_lock);
 list_for_each(stmp, &cifs_tcp_ses_list) {
  server = list_entry(stmp, struct TCP_Server_Info,
        tcp_ses_list);
  list_for_each(tmp, &server->smb_ses_list) {
   ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
   list_for_each(tmp1, &ses->tcon_list) {
    tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
    cfids = tcon->cfids;
    if (!cfids)
     continue;
    spin_lock(&cfids->cfid_list_lock); /* check lock ordering */
    seq_printf(m, "Num entries: %d\n", cfids->num_entries);
    list_for_each_entry(cfid, &cfids->entries, entry) {
     seq_printf(m, "0x%x 0x%llx 0x%llx %s",
      tcon->tid,
      ses->Suid,
      cfid->fid.persistent_fid,
      cfid->path);
     if (cfid->file_all_info_is_valid)
      seq_printf(m, "\tvalid file info");
     if (cfid->dirents.is_valid)
      seq_printf(m, ", valid dirents");
     seq_printf(m, "\n");
    }
    spin_unlock(&cfids->cfid_list_lock);
   }
  }
 }
 spin_unlock(&cifs_tcp_ses_lock);
 seq_putc(m, '\n');
 return 0;
}

static __always_inline const char *compression_alg_str(__le16 alg)
{
 switch (alg) {
 case SMB3_COMPRESS_NONE:
  return "NONE";
 case SMB3_COMPRESS_LZNT1:
  return "LZNT1";
 case SMB3_COMPRESS_LZ77:
  return "LZ77";
 case SMB3_COMPRESS_LZ77_HUFF:
  return "LZ77-Huffman";
 case SMB3_COMPRESS_PATTERN:
  return "Pattern_V1";
 default:
  return "invalid";
 }
}

static __always_inline const char *cipher_alg_str(__le16 cipher)
{
 switch (cipher) {
 case SMB2_ENCRYPTION_AES128_CCM:
  return "AES128-CCM";
 case SMB2_ENCRYPTION_AES128_GCM:
  return "AES128-GCM";
 case SMB2_ENCRYPTION_AES256_CCM:
  return "AES256-CCM";
 case SMB2_ENCRYPTION_AES256_GCM:
  return "AES256-GCM";
 default:
  return "UNKNOWN";
 }
}

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
#ifdef CONFIG_CIFS_COMPRESSION
 seq_puts(m, ",COMPRESSION");
#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) {
#ifdef CONFIG_CIFS_SMB_DIRECT
  struct smbdirect_socket *sc;
  struct smbdirect_socket_parameters *sp;
#endif

  /* channel info will be printed as a part of sessions below */
  if (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);
  seq_printf(m, "\nClientGUID: %pUL", server->client_guid);
  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;
  }
  sc = &server->smbd_conn->socket;
  sp = &sc->parameters;

  seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
   "transport status: %x",
   server->smbd_conn->protocol,
   server->smbd_conn->socket.status);
  seq_printf(m, "\nConn receive_credit_max: %x "
   "send_credit_target: %x max_send_size: %x",
   sp->recv_credit_max,
   sp->send_credit_target,
   sp->max_send_size);
  seq_printf(m, "\nConn max_fragmented_recv_size: %x "
   "max_fragmented_send_size: %x max_receive_size:%x",
   sp->max_fragmented_recv_size,
   sp->max_fragmented_send_size,
   sp->max_recv_size);
  seq_printf(m, "\nConn keep_alive_interval: %x "
   "max_readwrite_size: %x rdma_readwrite_threshold: %x",
   sp->keepalive_interval_msec * 1000,
   sp->max_read_write_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 "
   "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,
   sc->recv_io.reassembly.data_length,
   sc->recv_io.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 ",
   server->smbd_conn->count_receive_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,%d,%d Dialect 0x%x",
   server->credits,
   server->echo_credits,
   server->oplock_credits,
   server->dialect);
  if (server->sign)
   seq_printf(m, " signed");
  if (server->posix_ext_supported)
   seq_printf(m, " posix");
  if (server->nosharesock)
   seq_printf(m, " nosharesock");

  seq_printf(m, "\nServer capabilities: 0x%x", server->capabilities);

  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));
#ifdef CONFIG_NET_NS
  if (server->net)
   seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
#endif /* NET_NS */

  seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
    atomic_read(&server->in_send),
    atomic_read(&server->num_waiters));

  if (server->leaf_fullpath) {
   seq_printf(m, "\nDFS leaf full path: %s",
       server->leaf_fullpath);
  }

  seq_puts(m, "\nCompression: ");
  if (!IS_ENABLED(CONFIG_CIFS_COMPRESSION))
   seq_puts(m, "no built-in support");
  else if (!server->compression.requested)
   seq_puts(m, "disabled on mount");
  else if (server->compression.enabled)
   seq_printf(m, "enabled (%s)", compression_alg_str(server->compression.alg));
  else
   seq_puts(m, "disabled (not supported by this server)");

  /* Show negotiated encryption cipher, even if not required */
  seq_puts(m, "\nEncryption: ");
  if (server->cipher_type)
   seq_printf(m, "Negotiated cipher (%s)", cipher_alg_str(server->cipher_type));

  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);
   }
   if (ses->expired_pwd)
    seq_puts(m, "password no longer valid ");
   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));

   if (ses->dfs_root_ses) {
    seq_printf(m, "\n\tDFS root session id: 0x%llx",
        ses->dfs_root_ses->Suid);
   }

   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_queue_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_queue_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) {
    if (cifs_ses_exiting(ses))
     continue;
    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;
     tcon->stats_from_time = ktime_get_real_seconds();
     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) {
   if (cifs_ses_exiting(ses))
    continue;
   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 since %ptTs UTC",
        atomic_read(&tcon->num_smbs_sent),
        &tcon->stats_from_time);
    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_single("open_dirs", 0400, proc_fs_cifs,
   cifs_debug_dirs_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("open_dirs", 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 (kstrtobool(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 | CIFSSEC_MUST_SEAL);

 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, sizeof(flags_string));

 if (copy_from_user(flags_string, buffer, count))
  return -EFAULT;

 if (count < 3) {
  /* single char or single char followed by null */
  if (kstrtobool(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 */