fs/cifs/cifsglob.h

   1 /*
   2  *   fs/cifs/cifsglob.h
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   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 XATTR_DOS_ATTRIB
  61 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  62 #endif
  63
  64 /*
  65  * CIFS vfs client Status information (based on what we know.)
  66  */
  67
  68  /* associated with each tcp and smb session */
  69 enum statusEnum {
  70         CifsNew = 0,
  71         CifsGood,
  72         CifsExiting,
  73         CifsNeedReconnect
  74 };
  75
  76 enum securityEnum {
  77         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  78         LANMAN,                 /* Legacy LANMAN auth */
  79         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  80         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  81         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  82         NTLMSSP,                /* NTLMSSP via SPNEGO */
  83         Kerberos                /* Kerberos via SPNEGO */
  84 };
  85
  86 enum protocolEnum {
  87         IPV4 = 0,
  88         IPV6,
  89         SCTP
  90         /* Netbios frames protocol not supported at this time */
  91 };
  92
  93 struct mac_key {
  94         unsigned int len;
  95         union {
  96                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
  97                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
  98                 struct {
  99                         char key[16];
 100                         struct ntlmv2_resp resp;
 101                 } ntlmv2;
 102         } data;
 103 };
 104
 105 struct cifs_cred {
 106         int uid;
 107         int gid;
 108         int mode;
 109         int cecount;
 110         struct cifs_sid osid;
 111         struct cifs_sid gsid;
 112         struct cifs_ntace *ntaces;
 113         struct cifs_ace *aces;
 114 };
 115
 116 /*
 117  *****************************************************************
 118  * Except the CIFS PDUs themselves all the
 119  * globally interesting structs should go here
 120  *****************************************************************
 121  */
 122
 123 struct TCP_Server_Info {
 124         /* 15 character server name + 0x20 16th byte indicating type = srv */
 125         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 126         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 127         char *hostname; /* hostname portion of UNC string */
 128         struct socket *ssocket;
 129         union {
 130                 struct sockaddr_in sockAddr;
 131                 struct sockaddr_in6 sockAddr6;
 132         } addr;
 133         wait_queue_head_t response_q;
 134         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 135         struct list_head pending_mid_q;
 136         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 137         unsigned short server_codepage; /* codepage for the server    */
 138         unsigned long ip_address;       /* IP addr for the server if known */
 139         enum protocolEnum protocolType;
 140         char versionMajor;
 141         char versionMinor;
 142         bool svlocal:1;                 /* local server or remote */
 143         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 144         atomic_t inFlight;  /* number of requests on the wire to server */
 145 #ifdef CONFIG_CIFS_STATS2
 146         atomic_t inSend; /* requests trying to send */
 147         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 148 #endif
 149         enum statusEnum tcpStatus; /* what we think the status is */
 150         struct semaphore tcpSem;
 151         struct task_struct *tsk;
 152         char server_GUID[16];
 153         char secMode;
 154         enum securityEnum secType;
 155         unsigned int maxReq;    /* Clients should submit no more */
 156         /* than maxReq distinct unanswered SMBs to the server when using  */
 157         /* multiplexed reads or writes */
 158         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 159         /* message size the server can send or receive for non-raw SMBs */
 160         unsigned int maxRw;     /* maxRw specifies the maximum */
 161         /* message size the server can send or receive for */
 162         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 163         char sessid[4];         /* unique token id for this session */
 164         /* (returned on Negotiate */
 165         int capabilities; /* allow selective disabling of caps by smb sess */
 166         int timeAdj;  /* Adjust for difference in server time zone in sec */
 167         __u16 CurrentMid;         /* multiplex id - rotating counter */
 168         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 169         /* 16th byte of RFC1001 workstation name is always null */
 170         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 171         __u32 sequence_number; /* needed for CIFS PDU signature */
 172         struct mac_key mac_signing_key;
 173         char ntlmv2_hash[16];
 174         unsigned long lstrp; /* when we got last response from this server */
 175 };
 176
 177 /*
 178  * The following is our shortcut to user information.  We surface the uid,
 179  * and name. We always get the password on the fly in case it
 180  * has changed. We also hang a list of sessions owned by this user off here.
 181  */
 182 struct cifsUidInfo {
 183         struct list_head userList;
 184         struct list_head sessionList; /* SMB sessions for this user */
 185         uid_t linux_uid;
 186         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 187         /* BB may need ptr or callback for PAM or WinBind info */
 188 };
 189
 190 /*
 191  * Session structure.  One of these for each uid session with a particular host
 192  */
 193 struct cifsSesInfo {
 194         struct list_head cifsSessionList;
 195         struct semaphore sesSem;
 196 #if 0
 197         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 198 #endif
 199         struct TCP_Server_Info *server; /* pointer to server info */
 200         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 201         enum statusEnum status;
 202         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 203         __u16 ipc_tid;          /* special tid for connection to IPC share */
 204         __u16 flags;
 205         char *serverOS;         /* name of operating system underlying server */
 206         char *serverNOS;        /* name of network operating system of server */
 207         char *serverDomain;     /* security realm of server */
 208         int Suid;               /* remote smb uid  */
 209         uid_t linux_uid;        /* local Linux uid */
 210         int capabilities;
 211         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 212                                 TCP names - will ipv6 and sctp addresses fit? */
 213         char userName[MAX_USERNAME_SIZE + 1];
 214         char *domainName;
 215         char *password;
 216 };
 217 /* no more than one of the following three session flags may be set */
 218 #define CIFS_SES_NT4 1
 219 #define CIFS_SES_OS2 2
 220 #define CIFS_SES_W9X 4
 221 /* following flag is set for old servers such as OS2 (and Win95?)
 222    which do not negotiate NTLM or POSIX dialects, but instead
 223    negotiate one of the older LANMAN dialects */
 224 #define CIFS_SES_LANMAN 8
 225 /*
 226  * there is one of these for each connection to a resource on a particular
 227  * session
 228  */
 229 struct cifsTconInfo {
 230         struct list_head cifsConnectionList;
 231         struct list_head openFileList;
 232         struct semaphore tconSem;
 233         struct cifsSesInfo *ses;        /* pointer to session associated with */
 234         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 235         char *nativeFileSystem;
 236         __u16 tid;              /* The 2 byte tree id */
 237         __u16 Flags;            /* optional support bits */
 238         enum statusEnum tidStatus;
 239         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 240 #ifdef CONFIG_CIFS_STATS
 241         atomic_t num_smbs_sent;
 242         atomic_t num_writes;
 243         atomic_t num_reads;
 244         atomic_t num_oplock_brks;
 245         atomic_t num_opens;
 246         atomic_t num_closes;
 247         atomic_t num_deletes;
 248         atomic_t num_mkdirs;
 249         atomic_t num_rmdirs;
 250         atomic_t num_renames;
 251         atomic_t num_t2renames;
 252         atomic_t num_ffirst;
 253         atomic_t num_fnext;
 254         atomic_t num_fclose;
 255         atomic_t num_hardlinks;
 256         atomic_t num_symlinks;
 257         atomic_t num_locks;
 258         atomic_t num_acl_get;
 259         atomic_t num_acl_set;
 260 #ifdef CONFIG_CIFS_STATS2
 261         unsigned long long time_writes;
 262         unsigned long long time_reads;
 263         unsigned long long time_opens;
 264         unsigned long long time_deletes;
 265         unsigned long long time_closes;
 266         unsigned long long time_mkdirs;
 267         unsigned long long time_rmdirs;
 268         unsigned long long time_renames;
 269         unsigned long long time_t2renames;
 270         unsigned long long time_ffirst;
 271         unsigned long long time_fnext;
 272         unsigned long long time_fclose;
 273 #endif /* CONFIG_CIFS_STATS2 */
 274         __u64    bytes_read;
 275         __u64    bytes_written;
 276         spinlock_t stat_lock;
 277 #endif /* CONFIG_CIFS_STATS */
 278         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 279         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 280         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 281         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 282         bool retry:1;
 283         bool nocase:1;
 284         bool seal:1;      /* transport encryption for this mounted share */
 285         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 286                                 for this mount even if server would support */
 287         /* BB add field for back pointer to sb struct(s)? */
 288 };
 289
 290 /*
 291  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 292  * This is used to track byte stream locks on the file
 293  */
 294 struct cifsLockInfo {
 295         struct list_head llist; /* pointer to next cifsLockInfo */
 296         __u64 offset;
 297         __u64 length;
 298         __u8 type;
 299 };
 300
 301 /*
 302  * One of these for each open instance of a file
 303  */
 304 struct cifs_search_info {
 305         loff_t index_of_last_entry;
 306         __u16 entries_in_buffer;
 307         __u16 info_level;
 308         __u32 resume_key;
 309         char *ntwrk_buf_start;
 310         char *srch_entries_start;
 311         char *presume_name;
 312         unsigned int resume_name_len;
 313         bool endOfSearch:1;
 314         bool emptyDir:1;
 315         bool unicode:1;
 316         bool smallBuf:1; /* so we know which buf_release function to call */
 317 };
 318
 319 struct cifsFileInfo {
 320         struct list_head tlist; /* pointer to next fid owned by tcon */
 321         struct list_head flist; /* next fid (file instance) for this inode */
 322         unsigned int uid;       /* allows finding which FileInfo structure */
 323         __u32 pid;              /* process id who opened file */
 324         __u16 netfid;           /* file id from remote */
 325         /* BB add lock scope info here if needed */ ;
 326         /* lock scope id (0 if none) */
 327         struct file *pfile; /* needed for writepage */
 328         struct inode *pInode; /* needed for oplock break */
 329         struct mutex lock_mutex;
 330         struct list_head llist; /* list of byte range locks we have. */
 331         bool closePend:1;       /* file is marked to close */
 332         bool invalidHandle:1;   /* file closed via session abend */
 333         bool messageMode:1;     /* for pipes: message vs byte mode */
 334         atomic_t wrtPending;   /* handle in use - defer close */
 335         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 336         struct cifs_search_info srch_inf;
 337 };
 338
 339 /*
 340  * One of these for each file inode
 341  */
 342
 343 struct cifsInodeInfo {
 344         struct list_head lockList;
 345         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 346         struct list_head openFileList;
 347         int write_behind_rc;
 348         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 349         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 350         unsigned long time;     /* jiffies of last update/check of inode */
 351         bool clientCanCacheRead:1;      /* read oplock */
 352         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 353         bool oplockPending:1;
 354         struct inode vfs_inode;
 355 };
 356
 357 static inline struct cifsInodeInfo *
 358 CIFS_I(struct inode *inode)
 359 {
 360         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 361 }
 362
 363 static inline struct cifs_sb_info *
 364 CIFS_SB(struct super_block *sb)
 365 {
 366         return sb->s_fs_info;
 367 }
 368
 369 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 370 {
 371         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 372                 return '/';
 373         else
 374                 return '\\';
 375 }
 376
 377 #ifdef CONFIG_CIFS_STATS
 378 #define cifs_stats_inc atomic_inc
 379
 380 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 381                                             unsigned int bytes)
 382 {
 383         if (bytes) {
 384                 spin_lock(&tcon->stat_lock);
 385                 tcon->bytes_written += bytes;
 386                 spin_unlock(&tcon->stat_lock);
 387         }
 388 }
 389
 390 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 391                                          unsigned int bytes)
 392 {
 393         spin_lock(&tcon->stat_lock);
 394         tcon->bytes_read += bytes;
 395         spin_unlock(&tcon->stat_lock);
 396 }
 397 #else
 398
 399 #define  cifs_stats_inc(field) do {} while (0)
 400 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 401 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 402
 403 #endif
 404
 405 /* one of these for every pending CIFS request to the server */
 406 struct mid_q_entry {
 407         struct list_head qhead; /* mids waiting on reply from this server */
 408         __u16 mid;              /* multiplex id */
 409         __u16 pid;              /* process id */
 410         __u32 sequence_number;  /* for CIFS signing */
 411         unsigned long when_alloc;  /* when mid was created */
 412 #ifdef CONFIG_CIFS_STATS2
 413         unsigned long when_sent; /* time when smb send finished */
 414         unsigned long when_received; /* when demux complete (taken off wire) */
 415 #endif
 416         struct cifsSesInfo *ses;        /* smb was sent to this server */
 417         struct task_struct *tsk;        /* task waiting for response */
 418         struct smb_hdr *resp_buf;       /* response buffer */
 419         int midState;   /* wish this were enum but can not pass to wait_event */
 420         __u8 command;   /* smb command code */
 421         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 422         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 423         bool multiEnd:1;        /* both received */
 424 };
 425
 426 struct oplock_q_entry {
 427         struct list_head qhead;
 428         struct inode *pinode;
 429         struct cifsTconInfo *tcon;
 430         __u16 netfid;
 431 };
 432
 433 /* for pending dnotify requests */
 434 struct dir_notify_req {
 435        struct list_head lhead;
 436        __le16 Pid;
 437        __le16 PidHigh;
 438        __u16 Mid;
 439        __u16 Tid;
 440        __u16 Uid;
 441        __u16 netfid;
 442        __u32 filter; /* CompletionFilter (for multishot) */
 443        int multishot;
 444        struct file *pfile;
 445 };
 446
 447 struct dfs_info3_param {
 448         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 449         int path_consumed;
 450         int server_type;
 451         int ref_flag;
 452         char *path_name;
 453         char *node_name;
 454 };
 455
 456 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 457 {
 458         if (param) {
 459                 kfree(param->path_name);
 460                 kfree(param->node_name);
 461                 kfree(param);
 462         }
 463 }
 464
 465 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 466                                        int number_of_items)
 467 {
 468         int i;
 469         if ((number_of_items == 0) || (param == NULL))
 470                 return;
 471         for (i = 0; i < number_of_items; i++) {
 472                 kfree(param[i].path_name);
 473                 kfree(param[i].node_name);
 474         }
 475         kfree(param);
 476 }
 477
 478 #define   MID_FREE 0
 479 #define   MID_REQUEST_ALLOCATED 1
 480 #define   MID_REQUEST_SUBMITTED 2
 481 #define   MID_RESPONSE_RECEIVED 4
 482 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 483 #define   MID_NO_RESP_NEEDED 0x10
 484
 485 /* Types of response buffer returned from SendReceive2 */
 486 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 487 #define   CIFS_SMALL_BUFFER     1
 488 #define   CIFS_LARGE_BUFFER     2
 489 #define   CIFS_IOVEC            4    /* array of response buffers */
 490
 491 /* Type of Request to SendReceive2 */
 492 #define   CIFS_STD_OP           0    /* normal request timeout */
 493 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 494 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 495 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 496 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 497 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 498 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 499 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 500 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 501
 502 /* Security Flags: indicate type of session setup needed */
 503 #define   CIFSSEC_MAY_SIGN      0x00001
 504 #define   CIFSSEC_MAY_NTLM      0x00002
 505 #define   CIFSSEC_MAY_NTLMV2    0x00004
 506 #define   CIFSSEC_MAY_KRB5      0x00008
 507 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 508 #define   CIFSSEC_MAY_LANMAN    0x00010
 509 #define   CIFSSEC_MAY_PLNTXT    0x00020
 510 #else
 511 #define   CIFSSEC_MAY_LANMAN    0
 512 #define   CIFSSEC_MAY_PLNTXT    0
 513 #endif /* weak passwords */
 514 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 515
 516 #define   CIFSSEC_MUST_SIGN     0x01001
 517 /* note that only one of the following can be set so the
 518 result of setting MUST flags more than once will be to
 519 require use of the stronger protocol */
 520 #define   CIFSSEC_MUST_NTLM     0x02002
 521 #define   CIFSSEC_MUST_NTLMV2   0x04004
 522 #define   CIFSSEC_MUST_KRB5     0x08008
 523 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 524 #define   CIFSSEC_MUST_LANMAN   0x10010
 525 #define   CIFSSEC_MUST_PLNTXT   0x20020
 526 #ifdef CONFIG_CIFS_UPCALL
 527 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 528 #else
 529 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 530 #endif /* UPCALL */
 531 #else /* do not allow weak pw hash */
 532 #ifdef CONFIG_CIFS_UPCALL
 533 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 534 #else
 535 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 536 #endif /* UPCALL */
 537 #endif /* WEAK_PW_HASH */
 538 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 539
 540 #define   CIFSSEC_DEF  CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2
 541 #define   CIFSSEC_MAX  CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2
 542 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 543 /*
 544  *****************************************************************
 545  * All constants go here
 546  *****************************************************************
 547  */
 548
 549 #define UID_HASH (16)
 550
 551 /*
 552  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 553  * following to be declared.
 554  */
 555
 556 /****************************************************************************
 557  *  Locking notes.  All updates to global variables and lists should be
 558  *                  protected by spinlocks or semaphores.
 559  *
 560  *  Spinlocks
 561  *  ---------
 562  *  GlobalMid_Lock protects:
 563  *      list operations on pending_mid_q and oplockQ
 564  *      updates to XID counters, multiplex id  and SMB sequence numbers
 565  *  GlobalSMBSesLock protects:
 566  *      list operations on tcp and SMB session lists and tCon lists
 567  *  f_owner.lock protects certain per file struct operations
 568  *  mapping->page_lock protects certain per page operations
 569  *
 570  *  Semaphores
 571  *  ----------
 572  *  sesSem     operations on smb session
 573  *  tconSem    operations on tree connection
 574  *  fh_sem      file handle reconnection operations
 575  *
 576  ****************************************************************************/
 577
 578 #ifdef DECLARE_GLOBALS_HERE
 579 #define GLOBAL_EXTERN
 580 #else
 581 #define GLOBAL_EXTERN extern
 582 #endif
 583
 584 /*
 585  * The list of servers that did not respond with NT LM 0.12.
 586  * This list helps improve performance and eliminate the messages indicating
 587  * that we had a communications error talking to the server in this list.
 588  */
 589 /* Feature not supported */
 590 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 591
 592 /*
 593  * The following is a hash table of all the users we know about.
 594  */
 595 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 596
 597 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 598 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 599 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 600 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 601
 602 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 603
 604 /* Outstanding dir notify requests */
 605 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 606 /* DirNotify response queue */
 607 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 608
 609 /*
 610  * Global transaction id (XID) information
 611  */
 612 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 613 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 614 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 615 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 616                                           /* on midQ entries */
 617 GLOBAL_EXTERN char Local_System_Name[15];
 618
 619 /*
 620  *  Global counters, updated atomically
 621  */
 622 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 623 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 624 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 625 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 626 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 627
 628 /* Various Debug counters */
 629 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 630 #ifdef CONFIG_CIFS_STATS2
 631 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 632 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 633 #endif
 634 GLOBAL_EXTERN atomic_t smBufAllocCount;
 635 GLOBAL_EXTERN atomic_t midCount;
 636
 637 /* Misc globals */
 638 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 639                                 to be established on existing mount if we
 640                                 have the uid/password or Kerberos credential
 641                                 or equivalent for current user */
 642 GLOBAL_EXTERN unsigned int oplockEnabled;
 643 GLOBAL_EXTERN unsigned int experimEnabled;
 644 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 645 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 646                                 with more secure ntlmssp2 challenge/resp */
 647 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 648 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 649 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 650 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 651 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 652 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 653