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 #include "cifsacl.h"
  23 /*
  24  * The sizes of various internal tables and strings
  25  */
  26 #define MAX_UID_INFO 16
  27 #define MAX_SES_INFO 2
  28 #define MAX_TCON_INFO 4
  29
  30 #define MAX_TREE_SIZE 2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1
  31 #define MAX_SERVER_SIZE 15
  32 #define MAX_SHARE_SIZE  64      /* used to be 20, this should still be enough */
  33 #define MAX_USERNAME_SIZE 32    /* 32 is to allow for 15 char names + null
  34                                    termination then *2 for unicode versions */
  35 #define MAX_PASSWORD_SIZE 16
  36
  37 #define CIFS_MIN_RCV_POOL 4
  38
  39 /*
  40  * MAX_REQ is the maximum number of requests that WE will send
  41  * on one socket concurently. It also matches the most common
  42  * value of max multiplex returned by servers.  We may
  43  * eventually want to use the negotiated value (in case
  44  * future servers can handle more) when we are more confident that
  45  * we will not have problems oveloading the socket with pending
  46  * write data.
  47  */
  48 #define CIFS_MAX_REQ 50
  49
  50 #define SERVER_NAME_LENGTH 15
  51 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  52
  53 /* used to define string lengths for reversing unicode strings */
  54 /*         (256+1)*2 = 514                                     */
  55 /*           (max path length + 1 for null) * 2 for unicode    */
  56 #define MAX_NAME 514
  57
  58 #include "cifspdu.h"
  59
  60 #ifndef FALSE
  61 #define FALSE 0
  62 #endif
  63
  64 #ifndef TRUE
  65 #define TRUE 1
  66 #endif
  67
  68 #ifndef XATTR_DOS_ATTRIB
  69 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  70 #endif
  71
  72 /*
  73  * This information is kept on every Server we know about.
  74  *
  75  * Some things to note:
  76  *
  77  */
  78 #define SERVER_NAME_LEN_WITH_NULL       (SERVER_NAME_LENGTH + 1)
  79
  80 /*
  81  * CIFS vfs client Status information (based on what we know.)
  82  */
  83
  84  /* associated with each tcp and smb session */
  85 enum statusEnum {
  86         CifsNew = 0,
  87         CifsGood,
  88         CifsExiting,
  89         CifsNeedReconnect
  90 };
  91
  92 enum securityEnum {
  93         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  94         LANMAN,                 /* Legacy LANMAN auth */
  95         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  96         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  97         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  98         NTLMSSP,                /* NTLMSSP via SPNEGO */
  99         Kerberos                /* Kerberos via SPNEGO */
 100 };
 101
 102 enum protocolEnum {
 103         IPV4 = 0,
 104         IPV6,
 105         SCTP
 106         /* Netbios frames protocol not supported at this time */
 107 };
 108
 109 struct mac_key {
 110         unsigned int len;
 111         union {
 112                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 113                 struct {
 114                         char key[16];
 115                         struct ntlmv2_resp resp;
 116                 } ntlmv2;
 117         } data;
 118 };
 119
 120 struct cifs_cred {
 121         int uid;
 122         int gid;
 123         int mode;
 124         int cecount;
 125         struct cifs_sid osid;
 126         struct cifs_sid gsid;
 127         struct cifs_ntace *ntaces;
 128         struct cifs_ace *aces;
 129 };
 130
 131 /*
 132  *****************************************************************
 133  * Except the CIFS PDUs themselves all the
 134  * globally interesting structs should go here
 135  *****************************************************************
 136  */
 137
 138 struct TCP_Server_Info {
 139         /* 15 character server name + 0x20 16th byte indicating type = srv */
 140         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 141         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 142         struct socket *ssocket;
 143         union {
 144                 struct sockaddr_in sockAddr;
 145                 struct sockaddr_in6 sockAddr6;
 146         } addr;
 147         wait_queue_head_t response_q;
 148         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 149         struct list_head pending_mid_q;
 150         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 151         unsigned short server_codepage; /* codepage for the server    */
 152         unsigned long ip_address;       /* IP addr for the server if known */
 153         enum protocolEnum protocolType;
 154         char versionMajor;
 155         char versionMinor;
 156         unsigned svlocal:1;     /* local server or remote */
 157         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 158         atomic_t inFlight;  /* number of requests on the wire to server */
 159 #ifdef CONFIG_CIFS_STATS2
 160         atomic_t inSend; /* requests trying to send */
 161         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 162 #endif
 163         enum statusEnum tcpStatus; /* what we think the status is */
 164         struct semaphore tcpSem;
 165         struct task_struct *tsk;
 166         char server_GUID[16];
 167         char secMode;
 168         enum securityEnum secType;
 169         unsigned int maxReq;    /* Clients should submit no more */
 170         /* than maxReq distinct unanswered SMBs to the server when using  */
 171         /* multiplexed reads or writes */
 172         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 173         /* message size the server can send or receive for non-raw SMBs */
 174         unsigned int maxRw;     /* maxRw specifies the maximum */
 175         /* message size the server can send or receive for */
 176         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 177         char sessid[4];         /* unique token id for this session */
 178         /* (returned on Negotiate */
 179         int capabilities; /* allow selective disabling of caps by smb sess */
 180         int timeAdj;  /* Adjust for difference in server time zone in sec */
 181         __u16 CurrentMid;         /* multiplex id - rotating counter */
 182         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 183         /* 16th byte of RFC1001 workstation name is always null */
 184         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 185         __u32 sequence_number; /* needed for CIFS PDU signature */
 186         struct mac_key mac_signing_key;
 187         char ntlmv2_hash[16];
 188         unsigned long lstrp; /* when we got last response from this server */
 189 };
 190
 191 /*
 192  * The following is our shortcut to user information.  We surface the uid,
 193  * and name. We always get the password on the fly in case it
 194  * has changed. We also hang a list of sessions owned by this user off here.
 195  */
 196 struct cifsUidInfo {
 197         struct list_head userList;
 198         struct list_head sessionList; /* SMB sessions for this user */
 199         uid_t linux_uid;
 200         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 201         /* BB may need ptr or callback for PAM or WinBind info */
 202 };
 203
 204 /*
 205  * Session structure.  One of these for each uid session with a particular host
 206  */
 207 struct cifsSesInfo {
 208         struct list_head cifsSessionList;
 209         struct semaphore sesSem;
 210 #if 0
 211         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 212 #endif
 213         struct TCP_Server_Info *server; /* pointer to server info */
 214         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 215         enum statusEnum status;
 216         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 217         __u16 ipc_tid;          /* special tid for connection to IPC share */
 218         __u16 flags;
 219         char *serverOS;         /* name of operating system underlying server */
 220         char *serverNOS;        /* name of network operating system of server */
 221         char *serverDomain;     /* security realm of server */
 222         int Suid;               /* remote smb uid  */
 223         uid_t linux_uid;        /* local Linux uid */
 224         int capabilities;
 225         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 226                                 TCP names - will ipv6 and sctp addresses fit? */
 227         char userName[MAX_USERNAME_SIZE + 1];
 228         char *domainName;
 229         char *password;
 230 };
 231 /* no more than one of the following three session flags may be set */
 232 #define CIFS_SES_NT4 1
 233 #define CIFS_SES_OS2 2
 234 #define CIFS_SES_W9X 4
 235 /* following flag is set for old servers such as OS2 (and Win95?)
 236    which do not negotiate NTLM or POSIX dialects, but instead
 237    negotiate one of the older LANMAN dialects */
 238 #define CIFS_SES_LANMAN 8
 239 /*
 240  * there is one of these for each connection to a resource on a particular
 241  * session
 242  */
 243 struct cifsTconInfo {
 244         struct list_head cifsConnectionList;
 245         struct list_head openFileList;
 246         struct semaphore tconSem;
 247         struct cifsSesInfo *ses;        /* pointer to session associated with */
 248         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 249         char *nativeFileSystem;
 250         __u16 tid;              /* The 2 byte tree id */
 251         __u16 Flags;            /* optional support bits */
 252         enum statusEnum tidStatus;
 253         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 254 #ifdef CONFIG_CIFS_STATS
 255         atomic_t num_smbs_sent;
 256         atomic_t num_writes;
 257         atomic_t num_reads;
 258         atomic_t num_oplock_brks;
 259         atomic_t num_opens;
 260         atomic_t num_closes;
 261         atomic_t num_deletes;
 262         atomic_t num_mkdirs;
 263         atomic_t num_rmdirs;
 264         atomic_t num_renames;
 265         atomic_t num_t2renames;
 266         atomic_t num_ffirst;
 267         atomic_t num_fnext;
 268         atomic_t num_fclose;
 269         atomic_t num_hardlinks;
 270         atomic_t num_symlinks;
 271         atomic_t num_locks;
 272         atomic_t num_acl_get;
 273         atomic_t num_acl_set;
 274 #ifdef CONFIG_CIFS_STATS2
 275         unsigned long long time_writes;
 276         unsigned long long time_reads;
 277         unsigned long long time_opens;
 278         unsigned long long time_deletes;
 279         unsigned long long time_closes;
 280         unsigned long long time_mkdirs;
 281         unsigned long long time_rmdirs;
 282         unsigned long long time_renames;
 283         unsigned long long time_t2renames;
 284         unsigned long long time_ffirst;
 285         unsigned long long time_fnext;
 286         unsigned long long time_fclose;
 287 #endif /* CONFIG_CIFS_STATS2 */
 288         __u64    bytes_read;
 289         __u64    bytes_written;
 290         spinlock_t stat_lock;
 291 #endif /* CONFIG_CIFS_STATS */
 292         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 293         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 294         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 295         unsigned ipc:1;         /* set if connection to IPC$ eg for RPC/PIPES */
 296         unsigned retry:1;
 297         unsigned nocase:1;
 298         unsigned unix_ext:1; /* if off disable Linux extensions to CIFS protocol
 299                                 for this mount even if server would support */
 300         /* BB add field for back pointer to sb struct(s)? */
 301 };
 302
 303 /*
 304  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 305  * This is used to track byte stream locks on the file
 306  */
 307 struct cifsLockInfo {
 308         struct list_head llist; /* pointer to next cifsLockInfo */
 309         __u64 offset;
 310         __u64 length;
 311         __u8 type;
 312 };
 313
 314 /*
 315  * One of these for each open instance of a file
 316  */
 317 struct cifs_search_info {
 318         loff_t index_of_last_entry;
 319         __u16 entries_in_buffer;
 320         __u16 info_level;
 321         __u32 resume_key;
 322         char *ntwrk_buf_start;
 323         char *srch_entries_start;
 324         char *presume_name;
 325         unsigned int resume_name_len;
 326         unsigned endOfSearch:1;
 327         unsigned emptyDir:1;
 328         unsigned unicode:1;
 329         unsigned smallBuf:1; /* so we know which buf_release function to call */
 330 };
 331
 332 struct cifsFileInfo {
 333         struct list_head tlist; /* pointer to next fid owned by tcon */
 334         struct list_head flist; /* next fid (file instance) for this inode */
 335         unsigned int uid;       /* allows finding which FileInfo structure */
 336         __u32 pid;              /* process id who opened file */
 337         __u16 netfid;           /* file id from remote */
 338         /* BB add lock scope info here if needed */ ;
 339         /* lock scope id (0 if none) */
 340         struct file *pfile; /* needed for writepage */
 341         struct inode *pInode; /* needed for oplock break */
 342         struct mutex lock_mutex;
 343         struct list_head llist; /* list of byte range locks we have. */
 344         unsigned closePend:1;   /* file is marked to close */
 345         unsigned invalidHandle:1;  /* file closed via session abend */
 346         unsigned messageMode:1;    /* for pipes: message vs byte mode */
 347         atomic_t wrtPending;   /* handle in use - defer close */
 348         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 349         char *search_resume_name; /* BB removeme BB */
 350         struct cifs_search_info srch_inf;
 351 };
 352
 353 /*
 354  * One of these for each file inode
 355  */
 356
 357 struct cifsInodeInfo {
 358         struct list_head lockList;
 359         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 360         struct list_head openFileList;
 361         int write_behind_rc;
 362         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 363         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 364         unsigned long time;     /* jiffies of last update/check of inode */
 365         unsigned clientCanCacheRead:1; /* read oplock */
 366         unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
 367         unsigned oplockPending:1;
 368         struct inode vfs_inode;
 369 };
 370
 371 static inline struct cifsInodeInfo *
 372 CIFS_I(struct inode *inode)
 373 {
 374         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 375 }
 376
 377 static inline struct cifs_sb_info *
 378 CIFS_SB(struct super_block *sb)
 379 {
 380         return sb->s_fs_info;
 381 }
 382
 383 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 384 {
 385         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 386                 return '/';
 387         else
 388                 return '\\';
 389 }
 390
 391 #ifdef CONFIG_CIFS_STATS
 392 #define cifs_stats_inc atomic_inc
 393
 394 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 395                                             unsigned int bytes)
 396 {
 397         if (bytes) {
 398                 spin_lock(&tcon->stat_lock);
 399                 tcon->bytes_written += bytes;
 400                 spin_unlock(&tcon->stat_lock);
 401         }
 402 }
 403
 404 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 405                                          unsigned int bytes)
 406 {
 407         spin_lock(&tcon->stat_lock);
 408         tcon->bytes_read += bytes;
 409         spin_unlock(&tcon->stat_lock);
 410 }
 411 #else
 412
 413 #define  cifs_stats_inc(field) do {} while (0)
 414 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 415 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 416
 417 #endif
 418
 419 /* one of these for every pending CIFS request to the server */
 420 struct mid_q_entry {
 421         struct list_head qhead; /* mids waiting on reply from this server */
 422         __u16 mid;              /* multiplex id */
 423         __u16 pid;              /* process id */
 424         __u32 sequence_number;  /* for CIFS signing */
 425         unsigned long when_alloc;  /* when mid was created */
 426 #ifdef CONFIG_CIFS_STATS2
 427         unsigned long when_sent; /* time when smb send finished */
 428         unsigned long when_received; /* when demux complete (taken off wire) */
 429 #endif
 430         struct cifsSesInfo *ses;        /* smb was sent to this server */
 431         struct task_struct *tsk;        /* task waiting for response */
 432         struct smb_hdr *resp_buf;       /* response buffer */
 433         int midState;   /* wish this were enum but can not pass to wait_event */
 434         __u8 command;   /* smb command code */
 435         unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
 436         unsigned multiRsp:1;   /* multiple trans2 responses for one request  */
 437         unsigned multiEnd:1; /* both received */
 438 };
 439
 440 struct oplock_q_entry {
 441         struct list_head qhead;
 442         struct inode *pinode;
 443         struct cifsTconInfo *tcon;
 444         __u16 netfid;
 445 };
 446
 447 /* for pending dnotify requests */
 448 struct dir_notify_req {
 449        struct list_head lhead;
 450        __le16 Pid;
 451        __le16 PidHigh;
 452        __u16 Mid;
 453        __u16 Tid;
 454        __u16 Uid;
 455        __u16 netfid;
 456        __u32 filter; /* CompletionFilter (for multishot) */
 457        int multishot;
 458        struct file *pfile;
 459 };
 460
 461 #define   MID_FREE 0
 462 #define   MID_REQUEST_ALLOCATED 1
 463 #define   MID_REQUEST_SUBMITTED 2
 464 #define   MID_RESPONSE_RECEIVED 4
 465 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 466 #define   MID_NO_RESP_NEEDED 0x10
 467
 468 /* Types of response buffer returned from SendReceive2 */
 469 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 470 #define   CIFS_SMALL_BUFFER     1
 471 #define   CIFS_LARGE_BUFFER     2
 472 #define   CIFS_IOVEC            4    /* array of response buffers */
 473
 474 /* Security Flags: indicate type of session setup needed */
 475 #define   CIFSSEC_MAY_SIGN      0x00001
 476 #define   CIFSSEC_MAY_NTLM      0x00002
 477 #define   CIFSSEC_MAY_NTLMV2    0x00004
 478 #define   CIFSSEC_MAY_KRB5      0x00008
 479 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 480 #define   CIFSSEC_MAY_LANMAN    0x00010
 481 #define   CIFSSEC_MAY_PLNTXT    0x00020
 482 #else
 483 #define   CIFSSEC_MAY_LANMAN    0
 484 #define   CIFSSEC_MAY_PLNTXT    0
 485 #endif /* weak passwords */
 486 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 487
 488 #define   CIFSSEC_MUST_SIGN     0x01001
 489 /* note that only one of the following can be set so the
 490 result of setting MUST flags more than once will be to
 491 require use of the stronger protocol */
 492 #define   CIFSSEC_MUST_NTLM     0x02002
 493 #define   CIFSSEC_MUST_NTLMV2   0x04004
 494 #define   CIFSSEC_MUST_KRB5     0x08008
 495 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 496 #define   CIFSSEC_MUST_LANMAN   0x10010
 497 #define   CIFSSEC_MUST_PLNTXT   0x20020
 498 #ifdef CONFIG_CIFS_UPCALL
 499 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 500 #else
 501 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 502 #endif /* UPCALL */
 503 #else /* do not allow weak pw hash */
 504 #ifdef CONFIG_CIFS_UPCALL
 505 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 506 #else
 507 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 508 #endif /* UPCALL */
 509 #endif /* WEAK_PW_HASH */
 510 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 511
 512 #define   CIFSSEC_DEF  CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2
 513 #define   CIFSSEC_MAX  CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2
 514 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 515 /*
 516  *****************************************************************
 517  * All constants go here
 518  *****************************************************************
 519  */
 520
 521 #define UID_HASH (16)
 522
 523 /*
 524  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 525  * following to be declared.
 526  */
 527
 528 /****************************************************************************
 529  *  Locking notes.  All updates to global variables and lists should be
 530  *                  protected by spinlocks or semaphores.
 531  *
 532  *  Spinlocks
 533  *  ---------
 534  *  GlobalMid_Lock protects:
 535  *      list operations on pending_mid_q and oplockQ
 536  *      updates to XID counters, multiplex id  and SMB sequence numbers
 537  *  GlobalSMBSesLock protects:
 538  *      list operations on tcp and SMB session lists and tCon lists
 539  *  f_owner.lock protects certain per file struct operations
 540  *  mapping->page_lock protects certain per page operations
 541  *
 542  *  Semaphores
 543  *  ----------
 544  *  sesSem     operations on smb session
 545  *  tconSem    operations on tree connection
 546  *  fh_sem      file handle reconnection operations
 547  *
 548  ****************************************************************************/
 549
 550 #ifdef DECLARE_GLOBALS_HERE
 551 #define GLOBAL_EXTERN
 552 #else
 553 #define GLOBAL_EXTERN extern
 554 #endif
 555
 556 /*
 557  * The list of servers that did not respond with NT LM 0.12.
 558  * This list helps improve performance and eliminate the messages indicating
 559  * that we had a communications error talking to the server in this list.
 560  */
 561 /* Feature not supported */
 562 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 563
 564 /*
 565  * The following is a hash table of all the users we know about.
 566  */
 567 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 568
 569 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 570 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 571 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 572 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 573
 574 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 575
 576 /* Outstanding dir notify requests */
 577 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 578 /* DirNotify response queue */
 579 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 580
 581 /*
 582  * Global transaction id (XID) information
 583  */
 584 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 585 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 586 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 587 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 588                                           /* on midQ entries */
 589 GLOBAL_EXTERN char Local_System_Name[15];
 590
 591 /*
 592  *  Global counters, updated atomically
 593  */
 594 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 595 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 596 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 597 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 598 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 599
 600 /* Various Debug counters to remove someday (BB) */
 601 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 602 #ifdef CONFIG_CIFS_STATS2
 603 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 604 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 605 #endif
 606 GLOBAL_EXTERN atomic_t smBufAllocCount;
 607 GLOBAL_EXTERN atomic_t midCount;
 608
 609 /* Misc globals */
 610 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 611                                 to be established on existing mount if we
 612                                 have the uid/password or Kerberos credential
 613                                 or equivalent for current user */
 614 GLOBAL_EXTERN unsigned int oplockEnabled;
 615 GLOBAL_EXTERN unsigned int experimEnabled;
 616 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 617 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 618                                 with more secure ntlmssp2 challenge/resp */
 619 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 620 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 621 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 622 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 623 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 624 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 625