fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2006
   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 /*
 108  *****************************************************************
 109  * Except the CIFS PDUs themselves all the
 110  * globally interesting structs should go here
 111  *****************************************************************
 112  */
 113
 114 struct TCP_Server_Info {
 115         /* 15 character server name + 0x20 16th byte indicating type = srv */
 116         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 117         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 118         struct socket *ssocket;
 119         union {
 120                 struct sockaddr_in sockAddr;
 121                 struct sockaddr_in6 sockAddr6;
 122         } addr;
 123         wait_queue_head_t response_q;
 124         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 125         struct list_head pending_mid_q;
 126         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 127         unsigned short server_codepage; /* codepage for the server    */
 128         unsigned long ip_address;       /* IP addr for the server if known */
 129         enum protocolEnum protocolType;
 130         char versionMajor;
 131         char versionMinor;
 132         unsigned svlocal:1;     /* local server or remote */
 133         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 134         atomic_t inFlight;  /* number of requests on the wire to server */
 135 #ifdef CONFIG_CIFS_STATS2
 136         atomic_t inSend; /* requests trying to send */
 137         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 138 #endif
 139         enum statusEnum tcpStatus; /* what we think the status is */
 140         struct semaphore tcpSem;
 141         struct task_struct *tsk;
 142         char server_GUID[16];
 143         char secMode;
 144         enum securityEnum secType;
 145         unsigned int maxReq;    /* Clients should submit no more */
 146         /* than maxReq distinct unanswered SMBs to the server when using  */
 147         /* multiplexed reads or writes */
 148         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 149         /* message size the server can send or receive for non-raw SMBs */
 150         unsigned int maxRw;     /* maxRw specifies the maximum */
 151         /* message size the server can send or receive for */
 152         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 153         char sessid[4];         /* unique token id for this session */
 154         /* (returned on Negotiate */
 155         int capabilities; /* allow selective disabling of caps by smb sess */
 156         int timeAdj;  /* Adjust for difference in server time zone in sec */
 157         __u16 CurrentMid;         /* multiplex id - rotating counter */
 158         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 159         /* 16th byte of RFC1001 workstation name is always null */
 160         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 161         __u32 sequence_number; /* needed for CIFS PDU signature */
 162         char mac_signing_key[CIFS_SESS_KEY_SIZE + 16];
 163         unsigned long lstrp; /* when we got last response from this server */
 164 };
 165
 166 /*
 167  * The following is our shortcut to user information.  We surface the uid,
 168  * and name. We always get the password on the fly in case it
 169  * has changed. We also hang a list of sessions owned by this user off here.
 170  */
 171 struct cifsUidInfo {
 172         struct list_head userList;
 173         struct list_head sessionList; /* SMB sessions for this user */
 174         uid_t linux_uid;
 175         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 176         /* BB may need ptr or callback for PAM or WinBind info */
 177 };
 178
 179 /*
 180  * Session structure.  One of these for each uid session with a particular host
 181  */
 182 struct cifsSesInfo {
 183         struct list_head cifsSessionList;
 184         struct semaphore sesSem;
 185 #if 0
 186         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 187 #endif
 188         struct TCP_Server_Info *server; /* pointer to server info */
 189         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 190         enum statusEnum status;
 191         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 192         __u16 ipc_tid;          /* special tid for connection to IPC share */
 193         __u16 flags;
 194         char *serverOS;         /* name of operating system underlying server */
 195         char *serverNOS;        /* name of network operating system of server */
 196         char *serverDomain;     /* security realm of server */
 197         int Suid;               /* remote smb uid  */
 198         uid_t linux_uid;        /* local Linux uid */
 199         int capabilities;
 200         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 201                                 TCP names - will ipv6 and sctp addresses fit? */
 202         char userName[MAX_USERNAME_SIZE + 1];
 203         char * domainName;
 204         char * password;
 205 };
 206 /* no more than one of the following three session flags may be set */
 207 #define CIFS_SES_NT4 1
 208 #define CIFS_SES_OS2 2
 209 #define CIFS_SES_W9X 4
 210 /* following flag is set for old servers such as OS2 (and Win95?)
 211    which do not negotiate NTLM or POSIX dialects, but instead
 212    negotiate one of the older LANMAN dialects */
 213 #define CIFS_SES_LANMAN 8
 214 /*
 215  * there is one of these for each connection to a resource on a particular
 216  * session
 217  */
 218 struct cifsTconInfo {
 219         struct list_head cifsConnectionList;
 220         struct list_head openFileList;
 221         struct semaphore tconSem;
 222         struct cifsSesInfo *ses;        /* pointer to session associated with */
 223         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 224         char *nativeFileSystem;
 225         __u16 tid;              /* The 2 byte tree id */
 226         __u16 Flags;            /* optional support bits */
 227         enum statusEnum tidStatus;
 228         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 229 #ifdef CONFIG_CIFS_STATS
 230         atomic_t num_smbs_sent;
 231         atomic_t num_writes;
 232         atomic_t num_reads;
 233         atomic_t num_oplock_brks;
 234         atomic_t num_opens;
 235         atomic_t num_closes;
 236         atomic_t num_deletes;
 237         atomic_t num_mkdirs;
 238         atomic_t num_rmdirs;
 239         atomic_t num_renames;
 240         atomic_t num_t2renames;
 241         atomic_t num_ffirst;
 242         atomic_t num_fnext;
 243         atomic_t num_fclose;
 244         atomic_t num_hardlinks;
 245         atomic_t num_symlinks;
 246         atomic_t num_locks;
 247         atomic_t num_acl_get;
 248         atomic_t num_acl_set;
 249 #ifdef CONFIG_CIFS_STATS2
 250         unsigned long long time_writes;
 251         unsigned long long time_reads;
 252         unsigned long long time_opens;
 253         unsigned long long time_deletes;
 254         unsigned long long time_closes;
 255         unsigned long long time_mkdirs;
 256         unsigned long long time_rmdirs;
 257         unsigned long long time_renames;
 258         unsigned long long time_t2renames;
 259         unsigned long long time_ffirst;
 260         unsigned long long time_fnext;
 261         unsigned long long time_fclose;
 262 #endif /* CONFIG_CIFS_STATS2 */
 263         __u64    bytes_read;
 264         __u64    bytes_written;
 265         spinlock_t stat_lock;
 266 #endif /* CONFIG_CIFS_STATS */
 267         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 268         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 269         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 270         unsigned retry:1;
 271         unsigned nocase:1;
 272         /* BB add field for back pointer to sb struct? */
 273 };
 274
 275 /*
 276  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 277  * This is used to track byte stream locks on the file
 278  */
 279 struct cifsLockInfo {
 280         struct list_head llist; /* pointer to next cifsLockInfo */
 281         __u64 offset;
 282         __u64 length;
 283         __u8 type;
 284 };
 285
 286 /*
 287  * One of these for each open instance of a file
 288  */
 289 struct cifs_search_info {
 290         loff_t index_of_last_entry;
 291         __u16 entries_in_buffer;
 292         __u16 info_level;
 293         __u32 resume_key;
 294         char * ntwrk_buf_start;
 295         char * srch_entries_start;
 296         char * presume_name;
 297         unsigned int resume_name_len;
 298         unsigned endOfSearch:1;
 299         unsigned emptyDir:1;
 300         unsigned unicode:1;
 301         unsigned smallBuf:1; /* so we know which buf_release function to call */
 302 };
 303
 304 struct cifsFileInfo {
 305         struct list_head tlist; /* pointer to next fid owned by tcon */
 306         struct list_head flist; /* next fid (file instance) for this inode */
 307         unsigned int uid;       /* allows finding which FileInfo structure */
 308         __u32 pid;              /* process id who opened file */
 309         __u16 netfid;           /* file id from remote */
 310         /* BB add lock scope info here if needed */ ;
 311         /* lock scope id (0 if none) */
 312         struct file * pfile; /* needed for writepage */
 313         struct inode * pInode; /* needed for oplock break */
 314         struct semaphore lock_sem;
 315         struct list_head llist; /* list of byte range locks we have. */
 316         unsigned closePend:1;   /* file is marked to close */
 317         unsigned invalidHandle:1;  /* file closed via session abend */
 318         atomic_t wrtPending;   /* handle in use - defer close */
 319         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 320         char * search_resume_name; /* BB removeme BB */
 321         struct cifs_search_info srch_inf;
 322 };
 323
 324 /*
 325  * One of these for each file inode
 326  */
 327
 328 struct cifsInodeInfo {
 329         struct list_head lockList;
 330         /* BB add in lists for dirty pages - i.e. write caching info for oplock */
 331         struct list_head openFileList;
 332         int write_behind_rc;
 333         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 334         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 335         unsigned long time;     /* jiffies of last update/check of inode */
 336         unsigned clientCanCacheRead:1; /* read oplock */
 337         unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
 338         unsigned oplockPending:1;
 339         struct inode vfs_inode;
 340 };
 341
 342 static inline struct cifsInodeInfo *
 343 CIFS_I(struct inode *inode)
 344 {
 345         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 346 }
 347
 348 static inline struct cifs_sb_info *
 349 CIFS_SB(struct super_block *sb)
 350 {
 351         return sb->s_fs_info;
 352 }
 353
 354 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 355 {
 356         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 357                 return '/';
 358         else
 359                 return '\\';
 360 }
 361
 362 #ifdef CONFIG_CIFS_STATS
 363 #define cifs_stats_inc atomic_inc
 364
 365 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 366                                             unsigned int bytes)
 367 {
 368         if (bytes) {
 369                 spin_lock(&tcon->stat_lock);
 370                 tcon->bytes_written += bytes;
 371                 spin_unlock(&tcon->stat_lock);
 372         }
 373 }
 374
 375 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 376                                          unsigned int bytes)
 377 {
 378         spin_lock(&tcon->stat_lock);
 379         tcon->bytes_read += bytes;
 380         spin_unlock(&tcon->stat_lock);
 381 }
 382 #else
 383
 384 #define  cifs_stats_inc(field) do {} while(0)
 385 #define  cifs_stats_bytes_written(tcon, bytes) do {} while(0)
 386 #define  cifs_stats_bytes_read(tcon, bytes) do {} while(0)
 387
 388 #endif
 389
 390 /* one of these for every pending CIFS request to the server */
 391 struct mid_q_entry {
 392         struct list_head qhead; /* mids waiting on reply from this server */
 393         __u16 mid;              /* multiplex id */
 394         __u16 pid;              /* process id */
 395         __u32 sequence_number;  /* for CIFS signing */
 396         unsigned long when_alloc;  /* when mid was created */
 397 #ifdef CONFIG_CIFS_STATS2
 398         unsigned long when_sent; /* time when smb send finished */
 399         unsigned long when_received; /* when demux complete (taken off wire) */
 400 #endif
 401         struct cifsSesInfo *ses;        /* smb was sent to this server */
 402         struct task_struct *tsk;        /* task waiting for response */
 403         struct smb_hdr *resp_buf;       /* response buffer */
 404         int midState;   /* wish this were enum but can not pass to wait_event */
 405         __u8 command;   /* smb command code */
 406         unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
 407         unsigned multiRsp:1;   /* multiple trans2 responses for one request  */
 408         unsigned multiEnd:1; /* both received */
 409 };
 410
 411 struct oplock_q_entry {
 412         struct list_head qhead;
 413         struct inode * pinode;
 414         struct cifsTconInfo * tcon;
 415         __u16 netfid;
 416 };
 417
 418 /* for pending dnotify requests */
 419 struct dir_notify_req {
 420        struct list_head lhead;
 421        __le16 Pid;
 422        __le16 PidHigh;
 423        __u16 Mid;
 424        __u16 Tid;
 425        __u16 Uid;
 426        __u16 netfid;
 427        __u32 filter; /* CompletionFilter (for multishot) */
 428        int multishot;
 429        struct file * pfile;
 430 };
 431
 432 #define   MID_FREE 0
 433 #define   MID_REQUEST_ALLOCATED 1
 434 #define   MID_REQUEST_SUBMITTED 2
 435 #define   MID_RESPONSE_RECEIVED 4
 436 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 437 #define   MID_NO_RESP_NEEDED 0x10
 438
 439 /* Types of response buffer returned from SendReceive2 */
 440 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 441 #define   CIFS_SMALL_BUFFER     1
 442 #define   CIFS_LARGE_BUFFER     2
 443 #define   CIFS_IOVEC            4    /* array of response buffers */
 444
 445 /* Security Flags: indicate type of session setup needed */
 446 #define   CIFSSEC_MAY_SIGN      0x00001
 447 #define   CIFSSEC_MAY_NTLM      0x00002
 448 #define   CIFSSEC_MAY_NTLMV2    0x00004
 449 #define   CIFSSEC_MAY_KRB5      0x00008
 450 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 451 #define   CIFSSEC_MAY_LANMAN    0x00010
 452 #define   CIFSSEC_MAY_PLNTXT    0x00020
 453 #endif /* weak passwords */
 454 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 455
 456 #define   CIFSSEC_MUST_SIGN     0x01001
 457 /* note that only one of the following can be set so the
 458 result of setting MUST flags more than once will be to
 459 require use of the stronger protocol */
 460 #define   CIFSSEC_MUST_NTLM     0x02002
 461 #define   CIFSSEC_MUST_NTLMV2   0x04004
 462 #define   CIFSSEC_MUST_KRB5     0x08008
 463 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 464 #define   CIFSSEC_MUST_LANMAN   0x10010
 465 #define   CIFSSEC_MUST_PLNTXT   0x20020
 466 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 467 #else
 468 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak config */
 469 #endif /* WEAK_PW_HASH */
 470 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 471
 472 #define   CIFSSEC_DEF  CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2
 473 #define   CIFSSEC_MAX  CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2
 474 /*
 475  *****************************************************************
 476  * All constants go here
 477  *****************************************************************
 478  */
 479
 480 #define UID_HASH (16)
 481
 482 /*
 483  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 484  * following to be declared.
 485  */
 486
 487 /****************************************************************************
 488  *  Locking notes.  All updates to global variables and lists should be
 489  *                  protected by spinlocks or semaphores.
 490  *
 491  *  Spinlocks
 492  *  ---------
 493  *  GlobalMid_Lock protects:
 494  *      list operations on pending_mid_q and oplockQ
 495  *      updates to XID counters, multiplex id  and SMB sequence numbers
 496  *  GlobalSMBSesLock protects:
 497  *      list operations on tcp and SMB session lists and tCon lists
 498  *  f_owner.lock protects certain per file struct operations
 499  *  mapping->page_lock protects certain per page operations
 500  *
 501  *  Semaphores
 502  *  ----------
 503  *  sesSem     operations on smb session
 504  *  tconSem    operations on tree connection
 505  *  fh_sem      file handle reconnection operations
 506  *
 507  ****************************************************************************/
 508
 509 #ifdef DECLARE_GLOBALS_HERE
 510 #define GLOBAL_EXTERN
 511 #else
 512 #define GLOBAL_EXTERN extern
 513 #endif
 514
 515 /*
 516  * The list of servers that did not respond with NT LM 0.12.
 517  * This list helps improve performance and eliminate the messages indicating
 518  * that we had a communications error talking to the server in this list.
 519  */
 520 /* Feature not supported */
 521 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 522
 523 /*
 524  * The following is a hash table of all the users we know about.
 525  */
 526 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 527
 528 GLOBAL_EXTERN struct list_head GlobalServerList; /* BB not implemented yet */
 529 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 530 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 531 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 532
 533 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 534
 535 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList; /* Outstanding dir notify requests */
 536 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;/* DirNotify response queue */
 537
 538 /*
 539  * Global transaction id (XID) information
 540  */
 541 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 542 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 543 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 544 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 545                                           /* on midQ entries */
 546 GLOBAL_EXTERN char Local_System_Name[15];
 547
 548 /*
 549  *  Global counters, updated atomically
 550  */
 551 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 552 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 553 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 554 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 555 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 556
 557 /* Various Debug counters to remove someday (BB) */
 558 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 559 #ifdef CONFIG_CIFS_STATS2
 560 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 561 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 562 #endif
 563 GLOBAL_EXTERN atomic_t smBufAllocCount;
 564 GLOBAL_EXTERN atomic_t midCount;
 565
 566 /* Misc globals */
 567 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 568                                 to be established on existing mount if we
 569                                 have the uid/password or Kerberos credential
 570                                 or equivalent for current user */
 571 GLOBAL_EXTERN unsigned int oplockEnabled;
 572 GLOBAL_EXTERN unsigned int experimEnabled;
 573 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 574 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 575                                 with more secure ntlmssp2 challenge/resp */
 576 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 577 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 578 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 579 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 580 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 581 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 582