fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2007
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *              Jeremy Allison (jra@samba.org)
   7  *
   8  *   This library is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU Lesser General Public License as published
  10  *   by the Free Software Foundation; either version 2.1 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This library is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16  *   the GNU Lesser General Public License for more details.
  17  *
  18  */
  19 #include <linux/in.h>
  20 #include <linux/in6.h>
  21 #include "cifs_fs_sb.h"
  22 /*
  23  * The sizes of various internal tables and strings
  24  */
  25 #define MAX_UID_INFO 16
  26 #define MAX_SES_INFO 2
  27 #define MAX_TCON_INFO 4
  28
  29 #define MAX_TREE_SIZE 2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1
  30 #define MAX_SERVER_SIZE 15
  31 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  32 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  33                                    termination then *2 for unicode versions */
  34 #define MAX_PASSWORD_SIZE 16
  35
  36 #define CIFS_MIN_RCV_POOL 4
  37
  38 /*
  39  * MAX_REQ is the maximum number of requests that WE will send
  40  * on one socket concurently. It also matches the most common
  41  * value of max multiplex returned by servers.  We may
  42  * eventually want to use the negotiated value (in case
  43  * future servers can handle more) when we are more confident that
  44  * we will not have problems oveloading the socket with pending
  45  * write data.
  46  */
  47 #define CIFS_MAX_REQ 50
  48
  49 #define SERVER_NAME_LENGTH 15
  50 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  51
  52 /* used to define string lengths for reversing unicode strings */
  53 /*         (256+1)*2 = 514                                     */
  54 /*           (max path length + 1 for null) * 2 for unicode    */
  55 #define MAX_NAME 514
  56
  57 #include "cifspdu.h"
  58
  59 #ifndef FALSE
  60 #define FALSE 0
  61 #endif
  62
  63 #ifndef TRUE
  64 #define TRUE 1
  65 #endif
  66
  67 #ifndef XATTR_DOS_ATTRIB
  68 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  69 #endif
  70
  71 /*
  72  * This information is kept on every Server we know about.
  73  *
  74  * Some things to note:
  75  *
  76  */
  77 #define SERVER_NAME_LEN_WITH_NULL       (SERVER_NAME_LENGTH + 1)
  78
  79 /*
  80  * CIFS vfs client Status information (based on what we know.)
  81  */
  82
  83  /* associated with each tcp and smb session */
  84 enum statusEnum {
  85         CifsNew = 0,
  86         CifsGood,
  87         CifsExiting,
  88         CifsNeedReconnect
  89 };
  90
  91 enum securityEnum {
  92         LANMAN = 0,             /* Legacy LANMAN auth */
  93         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  94         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  95         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  96         NTLMSSP,                /* NTLMSSP via SPNEGO */
  97         Kerberos                /* Kerberos via SPNEGO */
  98 };
  99
 100 enum protocolEnum {
 101         IPV4 = 0,
 102         IPV6,
 103         SCTP
 104         /* Netbios frames protocol not supported at this time */
 105 };
 106
 107 struct mac_key {
 108         unsigned int len;
 109         union {
 110                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 111                 struct {
 112                         char key[16];
 113                         struct ntlmv2_resp resp;
 114                 } ntlmv2;
 115         } data;
 116 };
 117
 118 /*
 119  *****************************************************************
 120  * Except the CIFS PDUs themselves all the
 121  * globally interesting structs should go here
 122  *****************************************************************
 123  */
 124
 125 struct TCP_Server_Info {
 126         /* 15 character server name + 0x20 16th byte indicating type = srv */
 127         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 128         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 129         struct socket *ssocket;
 130         union {
 131                 struct sockaddr_in sockAddr;
 132                 struct sockaddr_in6 sockAddr6;
 133         } addr;
 134         wait_queue_head_t response_q;
 135         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 136         struct list_head pending_mid_q;
 137         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 138         unsigned short server_codepage; /* codepage for the server    */
 139         unsigned long ip_address;       /* IP addr for the server if known */
 140         enum protocolEnum protocolType;
 141         char versionMajor;
 142         char versionMinor;
 143         unsigned svlocal:1;     /* local server or remote */
 144         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 145         atomic_t inFlight;  /* number of requests on the wire to server */
 146 #ifdef CONFIG_CIFS_STATS2
 147         atomic_t inSend; /* requests trying to send */
 148         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 149 #endif
 150         enum statusEnum tcpStatus; /* what we think the status is */
 151         struct semaphore tcpSem;
 152         struct task_struct *tsk;
 153         char server_GUID[16];
 154         char secMode;
 155         enum securityEnum secType;
 156         unsigned int maxReq;    /* Clients should submit no more */
 157         /* than maxReq distinct unanswered SMBs to the server when using  */
 158         /* multiplexed reads or writes */
 159         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 160         /* message size the server can send or receive for non-raw SMBs */
 161         unsigned int maxRw;     /* maxRw specifies the maximum */
 162         /* message size the server can send or receive for */
 163         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 164         char sessid[4];         /* unique token id for this session */
 165         /* (returned on Negotiate */
 166         int capabilities; /* allow selective disabling of caps by smb sess */
 167         int timeAdj;  /* Adjust for difference in server time zone in sec */
 168         __u16 CurrentMid;         /* multiplex id - rotating counter */
 169         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 170         /* 16th byte of RFC1001 workstation name is always null */
 171         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 172         __u32 sequence_number; /* needed for CIFS PDU signature */
 173         struct mac_key mac_signing_key;
 174         char ntlmv2_hash[16];
 175         unsigned long lstrp; /* when we got last response from this server */
 176 };
 177
 178 /*
 179  * The following is our shortcut to user information.  We surface the uid,
 180  * and name. We always get the password on the fly in case it
 181  * has changed. We also hang a list of sessions owned by this user off here.
 182  */
 183 struct cifsUidInfo {
 184         struct list_head userList;
 185         struct list_head sessionList; /* SMB sessions for this user */
 186         uid_t linux_uid;
 187         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 188         /* BB may need ptr or callback for PAM or WinBind info */
 189 };
 190
 191 /*
 192  * Session structure.  One of these for each uid session with a particular host
 193  */
 194 struct cifsSesInfo {
 195         struct list_head cifsSessionList;
 196         struct semaphore sesSem;
 197 #if 0
 198         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 199 #endif
 200         struct TCP_Server_Info *server; /* pointer to server info */
 201         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 202         enum statusEnum status;
 203         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 204         __u16 ipc_tid;          /* special tid for connection to IPC share */
 205         __u16 flags;
 206         char *serverOS;         /* name of operating system underlying server */
 207         char *serverNOS;        /* name of network operating system of server */
 208         char *serverDomain;     /* security realm of server */
 209         int Suid;               /* remote smb uid  */
 210         uid_t linux_uid;        /* local Linux uid */
 211         int capabilities;
 212         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 213                                 TCP names - will ipv6 and sctp addresses fit? */
 214         char userName[MAX_USERNAME_SIZE + 1];
 215         char *domainName;
 216         char *password;
 217 };
 218 /* no more than one of the following three session flags may be set */
 219 #define CIFS_SES_NT4 1
 220 #define CIFS_SES_OS2 2
 221 #define CIFS_SES_W9X 4
 222 /* following flag is set for old servers such as OS2 (and Win95?)
 223    which do not negotiate NTLM or POSIX dialects, but instead
 224    negotiate one of the older LANMAN dialects */
 225 #define CIFS_SES_LANMAN 8
 226 /*
 227  * there is one of these for each connection to a resource on a particular
 228  * session
 229  */
 230 struct cifsTconInfo {
 231         struct list_head cifsConnectionList;
 232         struct list_head openFileList;
 233         struct semaphore tconSem;
 234         struct cifsSesInfo *ses;        /* pointer to session associated with */
 235         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 236         char *nativeFileSystem;
 237         __u16 tid;              /* The 2 byte tree id */
 238         __u16 Flags;            /* optional support bits */
 239         enum statusEnum tidStatus;
 240         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 241 #ifdef CONFIG_CIFS_STATS
 242         atomic_t num_smbs_sent;
 243         atomic_t num_writes;
 244         atomic_t num_reads;
 245         atomic_t num_oplock_brks;
 246         atomic_t num_opens;
 247         atomic_t num_closes;
 248         atomic_t num_deletes;
 249         atomic_t num_mkdirs;
 250         atomic_t num_rmdirs;
 251         atomic_t num_renames;
 252         atomic_t num_t2renames;
 253         atomic_t num_ffirst;
 254         atomic_t num_fnext;
 255         atomic_t num_fclose;
 256         atomic_t num_hardlinks;
 257         atomic_t num_symlinks;
 258         atomic_t num_locks;
 259         atomic_t num_acl_get;
 260         atomic_t num_acl_set;
 261 #ifdef CONFIG_CIFS_STATS2
 262         unsigned long long time_writes;
 263         unsigned long long time_reads;
 264         unsigned long long time_opens;
 265         unsigned long long time_deletes;
 266         unsigned long long time_closes;
 267         unsigned long long time_mkdirs;
 268         unsigned long long time_rmdirs;
 269         unsigned long long time_renames;
 270         unsigned long long time_t2renames;
 271         unsigned long long time_ffirst;
 272         unsigned long long time_fnext;
 273         unsigned long long time_fclose;
 274 #endif /* CONFIG_CIFS_STATS2 */
 275         __u64    bytes_read;
 276         __u64    bytes_written;
 277         spinlock_t stat_lock;
 278 #endif /* CONFIG_CIFS_STATS */
 279         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 280         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 281         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 282         unsigned retry:1;
 283         unsigned nocase:1;
 284         unsigned unix_ext:1; /* if off disable Linux extensions to CIFS protocol
 285                                 for this mount even if server would support */
 286         /* BB add field for back pointer to sb struct(s)? */
 287 };
 288
 289 /*
 290  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 291  * This is used to track byte stream locks on the file
 292  */
 293 struct cifsLockInfo {
 294         struct list_head llist; /* pointer to next cifsLockInfo */
 295         __u64 offset;
 296         __u64 length;
 297         __u8 type;
 298 };
 299
 300 /*
 301  * One of these for each open instance of a file
 302  */
 303 struct cifs_search_info {
 304         loff_t index_of_last_entry;
 305         __u16 entries_in_buffer;
 306         __u16 info_level;
 307         __u32 resume_key;
 308         char *ntwrk_buf_start;
 309         char *srch_entries_start;
 310         char *presume_name;
 311         unsigned int resume_name_len;
 312         unsigned endOfSearch:1;
 313         unsigned emptyDir:1;
 314         unsigned unicode:1;
 315         unsigned smallBuf:1; /* so we know which buf_release function to call */
 316 };
 317
 318 struct cifsFileInfo {
 319         struct list_head tlist; /* pointer to next fid owned by tcon */
 320         struct list_head flist; /* next fid (file instance) for this inode */
 321         unsigned int uid;       /* allows finding which FileInfo structure */
 322         __u32 pid;              /* process id who opened file */
 323         __u16 netfid;           /* file id from remote */
 324         /* BB add lock scope info here if needed */ ;
 325         /* lock scope id (0 if none) */
 326         struct file *pfile; /* needed for writepage */
 327         struct inode *pInode; /* needed for oplock break */
 328         struct mutex lock_mutex;
 329         struct list_head llist; /* list of byte range locks we have. */
 330         unsigned closePend:1;   /* file is marked to close */
 331         unsigned invalidHandle:1;  /* file closed via session abend */
 332         atomic_t wrtPending;   /* handle in use - defer close */
 333         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 334         char *search_resume_name; /* BB removeme BB */
 335         struct cifs_search_info srch_inf;
 336 };
 337
 338 /*
 339  * One of these for each file inode
 340  */
 341
 342 struct cifsInodeInfo {
 343         struct list_head lockList;
 344         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 345         struct list_head openFileList;
 346         int write_behind_rc;
 347         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 348         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 349         unsigned long time;     /* jiffies of last update/check of inode */
 350         unsigned clientCanCacheRead:1; /* read oplock */
 351         unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
 352         unsigned oplockPending:1;
 353         struct inode vfs_inode;
 354 };
 355
 356 static inline struct cifsInodeInfo *
 357 CIFS_I(struct inode *inode)
 358 {
 359         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 360 }
 361
 362 static inline struct cifs_sb_info *
 363 CIFS_SB(struct super_block *sb)
 364 {
 365         return sb->s_fs_info;
 366 }
 367
 368 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 369 {
 370         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 371                 return '/';
 372         else
 373                 return '\\';
 374 }
 375
 376 #ifdef CONFIG_CIFS_STATS
 377 #define cifs_stats_inc atomic_inc
 378
 379 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 380                                             unsigned int bytes)
 381 {
 382         if (bytes) {
 383                 spin_lock(&tcon->stat_lock);
 384                 tcon->bytes_written += bytes;
 385                 spin_unlock(&tcon->stat_lock);
 386         }
 387 }
 388
 389 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 390                                          unsigned int bytes)
 391 {
 392         spin_lock(&tcon->stat_lock);
 393         tcon->bytes_read += bytes;
 394         spin_unlock(&tcon->stat_lock);
 395 }
 396 #else
 397
 398 #define  cifs_stats_inc(field) do {} while (0)
 399 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 400 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 401
 402 #endif
 403
 404 /* one of these for every pending CIFS request to the server */
 405 struct mid_q_entry {
 406         struct list_head qhead; /* mids waiting on reply from this server */
 407         __u16 mid;              /* multiplex id */
 408         __u16 pid;              /* process id */
 409         __u32 sequence_number;  /* for CIFS signing */
 410         unsigned long when_alloc;  /* when mid was created */
 411 #ifdef CONFIG_CIFS_STATS2
 412         unsigned long when_sent; /* time when smb send finished */
 413         unsigned long when_received; /* when demux complete (taken off wire) */
 414 #endif
 415         struct cifsSesInfo *ses;        /* smb was sent to this server */
 416         struct task_struct *tsk;        /* task waiting for response */
 417         struct smb_hdr *resp_buf;       /* response buffer */
 418         int midState;   /* wish this were enum but can not pass to wait_event */
 419         __u8 command;   /* smb command code */
 420         unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
 421         unsigned multiRsp:1;   /* multiple trans2 responses for one request  */
 422         unsigned multiEnd:1; /* both received */
 423 };
 424
 425 struct oplock_q_entry {
 426         struct list_head qhead;
 427         struct inode *pinode;
 428         struct cifsTconInfo *tcon;
 429         __u16 netfid;
 430 };
 431
 432 /* for pending dnotify requests */
 433 struct dir_notify_req {
 434        struct list_head lhead;
 435        __le16 Pid;
 436        __le16 PidHigh;
 437        __u16 Mid;
 438        __u16 Tid;
 439        __u16 Uid;
 440        __u16 netfid;
 441        __u32 filter; /* CompletionFilter (for multishot) */
 442        int multishot;
 443        struct file *pfile;
 444 };
 445
 446 #define   MID_FREE 0
 447 #define   MID_REQUEST_ALLOCATED 1
 448 #define   MID_REQUEST_SUBMITTED 2
 449 #define   MID_RESPONSE_RECEIVED 4
 450 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 451 #define   MID_NO_RESP_NEEDED 0x10
 452
 453 /* Types of response buffer returned from SendReceive2 */
 454 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 455 #define   CIFS_SMALL_BUFFER     1
 456 #define   CIFS_LARGE_BUFFER     2
 457 #define   CIFS_IOVEC            4    /* array of response buffers */
 458
 459 /* Security Flags: indicate type of session setup needed */
 460 #define   CIFSSEC_MAY_SIGN      0x00001
 461 #define   CIFSSEC_MAY_NTLM      0x00002
 462 #define   CIFSSEC_MAY_NTLMV2    0x00004
 463 #define   CIFSSEC_MAY_KRB5      0x00008
 464 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 465 #define   CIFSSEC_MAY_LANMAN    0x00010
 466 #define   CIFSSEC_MAY_PLNTXT    0x00020
 467 #endif /* weak passwords */
 468 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 469
 470 #define   CIFSSEC_MUST_SIGN     0x01001
 471 /* note that only one of the following can be set so the
 472 result of setting MUST flags more than once will be to
 473 require use of the stronger protocol */
 474 #define   CIFSSEC_MUST_NTLM     0x02002
 475 #define   CIFSSEC_MUST_NTLMV2   0x04004
 476 #define   CIFSSEC_MUST_KRB5     0x08008
 477 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 478 #define   CIFSSEC_MUST_LANMAN   0x10010
 479 #define   CIFSSEC_MUST_PLNTXT   0x20020
 480 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 481 #else
 482 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak config */
 483 #endif /* WEAK_PW_HASH */
 484 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 485
 486 #define   CIFSSEC_DEF  CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2
 487 #define   CIFSSEC_MAX  CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2
 488 /*
 489  *****************************************************************
 490  * All constants go here
 491  *****************************************************************
 492  */
 493
 494 #define UID_HASH (16)
 495
 496 /*
 497  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 498  * following to be declared.
 499  */
 500
 501 /****************************************************************************
 502  *  Locking notes.  All updates to global variables and lists should be
 503  *                  protected by spinlocks or semaphores.
 504  *
 505  *  Spinlocks
 506  *  ---------
 507  *  GlobalMid_Lock protects:
 508  *      list operations on pending_mid_q and oplockQ
 509  *      updates to XID counters, multiplex id  and SMB sequence numbers
 510  *  GlobalSMBSesLock protects:
 511  *      list operations on tcp and SMB session lists and tCon lists
 512  *  f_owner.lock protects certain per file struct operations
 513  *  mapping->page_lock protects certain per page operations
 514  *
 515  *  Semaphores
 516  *  ----------
 517  *  sesSem     operations on smb session
 518  *  tconSem    operations on tree connection
 519  *  fh_sem      file handle reconnection operations
 520  *
 521  ****************************************************************************/
 522
 523 #ifdef DECLARE_GLOBALS_HERE
 524 #define GLOBAL_EXTERN
 525 #else
 526 #define GLOBAL_EXTERN extern
 527 #endif
 528
 529 /*
 530  * The list of servers that did not respond with NT LM 0.12.
 531  * This list helps improve performance and eliminate the messages indicating
 532  * that we had a communications error talking to the server in this list.
 533  */
 534 /* Feature not supported */
 535 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 536
 537 /*
 538  * The following is a hash table of all the users we know about.
 539  */
 540 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 541
 542 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 543 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 544 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 545 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 546
 547 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 548
 549 /* Outstanding dir notify requests */
 550 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 551 /* DirNotify response queue */
 552 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 553
 554 /*
 555  * Global transaction id (XID) information
 556  */
 557 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 558 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 559 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 560 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 561                                           /* on midQ entries */
 562 GLOBAL_EXTERN char Local_System_Name[15];
 563
 564 /*
 565  *  Global counters, updated atomically
 566  */
 567 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 568 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 569 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 570 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 571 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 572
 573 /* Various Debug counters to remove someday (BB) */
 574 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 575 #ifdef CONFIG_CIFS_STATS2
 576 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 577 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 578 #endif
 579 GLOBAL_EXTERN atomic_t smBufAllocCount;
 580 GLOBAL_EXTERN atomic_t midCount;
 581
 582 /* Misc globals */
 583 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 584                                 to be established on existing mount if we
 585                                 have the uid/password or Kerberos credential
 586                                 or equivalent for current user */
 587 GLOBAL_EXTERN unsigned int oplockEnabled;
 588 GLOBAL_EXTERN unsigned int experimEnabled;
 589 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 590 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 591                                 with more secure ntlmssp2 challenge/resp */
 592 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 593 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 594 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 595 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 596 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 597 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 598