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         MSKerberos,             /* MS Kerberos via SPNEGO */
  85 };
  86
  87 enum protocolEnum {
  88         IPV4 = 0,
  89         IPV6,
  90         SCTP
  91         /* Netbios frames protocol not supported at this time */
  92 };
  93
  94 struct mac_key {
  95         unsigned int len;
  96         union {
  97                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
  98                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
  99                 struct {
 100                         char key[16];
 101                         struct ntlmv2_resp resp;
 102                 } ntlmv2;
 103         } data;
 104 };
 105
 106 struct cifs_cred {
 107         int uid;
 108         int gid;
 109         int mode;
 110         int cecount;
 111         struct cifs_sid osid;
 112         struct cifs_sid gsid;
 113         struct cifs_ntace *ntaces;
 114         struct cifs_ace *aces;
 115 };
 116
 117 /*
 118  *****************************************************************
 119  * Except the CIFS PDUs themselves all the
 120  * globally interesting structs should go here
 121  *****************************************************************
 122  */
 123
 124 struct TCP_Server_Info {
 125         /* 15 character server name + 0x20 16th byte indicating type = srv */
 126         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 127         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 128         char *hostname; /* hostname portion of UNC string */
 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         bool 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         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 283         bool retry:1;
 284         bool nocase:1;
 285         bool seal:1;      /* transport encryption for this mounted share */
 286         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 287                                 for this mount even if server would support */
 288         /* BB add field for back pointer to sb struct(s)? */
 289 };
 290
 291 /*
 292  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 293  * This is used to track byte stream locks on the file
 294  */
 295 struct cifsLockInfo {
 296         struct list_head llist; /* pointer to next cifsLockInfo */
 297         __u64 offset;
 298         __u64 length;
 299         __u8 type;
 300 };
 301
 302 /*
 303  * One of these for each open instance of a file
 304  */
 305 struct cifs_search_info {
 306         loff_t index_of_last_entry;
 307         __u16 entries_in_buffer;
 308         __u16 info_level;
 309         __u32 resume_key;
 310         char *ntwrk_buf_start;
 311         char *srch_entries_start;
 312         char *last_entry;
 313         char *presume_name;
 314         unsigned int resume_name_len;
 315         bool endOfSearch:1;
 316         bool emptyDir:1;
 317         bool unicode:1;
 318         bool smallBuf:1; /* so we know which buf_release function to call */
 319 };
 320
 321 struct cifsFileInfo {
 322         struct list_head tlist; /* pointer to next fid owned by tcon */
 323         struct list_head flist; /* next fid (file instance) for this inode */
 324         unsigned int uid;       /* allows finding which FileInfo structure */
 325         __u32 pid;              /* process id who opened file */
 326         __u16 netfid;           /* file id from remote */
 327         /* BB add lock scope info here if needed */ ;
 328         /* lock scope id (0 if none) */
 329         struct file *pfile; /* needed for writepage */
 330         struct inode *pInode; /* needed for oplock break */
 331         struct mutex lock_mutex;
 332         struct list_head llist; /* list of byte range locks we have. */
 333         bool closePend:1;       /* file is marked to close */
 334         bool invalidHandle:1;   /* file closed via session abend */
 335         bool messageMode:1;     /* for pipes: message vs byte mode */
 336         atomic_t wrtPending;   /* handle in use - defer close */
 337         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 338         struct cifs_search_info srch_inf;
 339 };
 340
 341 /*
 342  * One of these for each file inode
 343  */
 344
 345 struct cifsInodeInfo {
 346         struct list_head lockList;
 347         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 348         struct list_head openFileList;
 349         int write_behind_rc;
 350         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 351         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 352         unsigned long time;     /* jiffies of last update/check of inode */
 353         bool clientCanCacheRead:1;      /* read oplock */
 354         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 355         bool oplockPending:1;
 356         struct inode vfs_inode;
 357 };
 358
 359 static inline struct cifsInodeInfo *
 360 CIFS_I(struct inode *inode)
 361 {
 362         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 363 }
 364
 365 static inline struct cifs_sb_info *
 366 CIFS_SB(struct super_block *sb)
 367 {
 368         return sb->s_fs_info;
 369 }
 370
 371 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 372 {
 373         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 374                 return '/';
 375         else
 376                 return '\\';
 377 }
 378
 379 #ifdef CONFIG_CIFS_STATS
 380 #define cifs_stats_inc atomic_inc
 381
 382 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 383                                             unsigned int bytes)
 384 {
 385         if (bytes) {
 386                 spin_lock(&tcon->stat_lock);
 387                 tcon->bytes_written += bytes;
 388                 spin_unlock(&tcon->stat_lock);
 389         }
 390 }
 391
 392 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 393                                          unsigned int bytes)
 394 {
 395         spin_lock(&tcon->stat_lock);
 396         tcon->bytes_read += bytes;
 397         spin_unlock(&tcon->stat_lock);
 398 }
 399 #else
 400
 401 #define  cifs_stats_inc(field) do {} while (0)
 402 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 403 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 404
 405 #endif
 406
 407 /* one of these for every pending CIFS request to the server */
 408 struct mid_q_entry {
 409         struct list_head qhead; /* mids waiting on reply from this server */
 410         __u16 mid;              /* multiplex id */
 411         __u16 pid;              /* process id */
 412         __u32 sequence_number;  /* for CIFS signing */
 413         unsigned long when_alloc;  /* when mid was created */
 414 #ifdef CONFIG_CIFS_STATS2
 415         unsigned long when_sent; /* time when smb send finished */
 416         unsigned long when_received; /* when demux complete (taken off wire) */
 417 #endif
 418         struct cifsSesInfo *ses;        /* smb was sent to this server */
 419         struct task_struct *tsk;        /* task waiting for response */
 420         struct smb_hdr *resp_buf;       /* response buffer */
 421         int midState;   /* wish this were enum but can not pass to wait_event */
 422         __u8 command;   /* smb command code */
 423         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 424         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 425         bool multiEnd:1;        /* both received */
 426 };
 427
 428 struct oplock_q_entry {
 429         struct list_head qhead;
 430         struct inode *pinode;
 431         struct cifsTconInfo *tcon;
 432         __u16 netfid;
 433 };
 434
 435 /* for pending dnotify requests */
 436 struct dir_notify_req {
 437        struct list_head lhead;
 438        __le16 Pid;
 439        __le16 PidHigh;
 440        __u16 Mid;
 441        __u16 Tid;
 442        __u16 Uid;
 443        __u16 netfid;
 444        __u32 filter; /* CompletionFilter (for multishot) */
 445        int multishot;
 446        struct file *pfile;
 447 };
 448
 449 struct dfs_info3_param {
 450         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 451         int path_consumed;
 452         int server_type;
 453         int ref_flag;
 454         char *path_name;
 455         char *node_name;
 456 };
 457
 458 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 459 {
 460         if (param) {
 461                 kfree(param->path_name);
 462                 kfree(param->node_name);
 463                 kfree(param);
 464         }
 465 }
 466
 467 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 468                                        int number_of_items)
 469 {
 470         int i;
 471         if ((number_of_items == 0) || (param == NULL))
 472                 return;
 473         for (i = 0; i < number_of_items; i++) {
 474                 kfree(param[i].path_name);
 475                 kfree(param[i].node_name);
 476         }
 477         kfree(param);
 478 }
 479
 480 #define   MID_FREE 0
 481 #define   MID_REQUEST_ALLOCATED 1
 482 #define   MID_REQUEST_SUBMITTED 2
 483 #define   MID_RESPONSE_RECEIVED 4
 484 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 485 #define   MID_NO_RESP_NEEDED 0x10
 486
 487 /* Types of response buffer returned from SendReceive2 */
 488 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 489 #define   CIFS_SMALL_BUFFER     1
 490 #define   CIFS_LARGE_BUFFER     2
 491 #define   CIFS_IOVEC            4    /* array of response buffers */
 492
 493 /* Type of Request to SendReceive2 */
 494 #define   CIFS_STD_OP           0    /* normal request timeout */
 495 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 496 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 497 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 498 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 499 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 500 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 501 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 502 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 503
 504 /* Security Flags: indicate type of session setup needed */
 505 #define   CIFSSEC_MAY_SIGN      0x00001
 506 #define   CIFSSEC_MAY_NTLM      0x00002
 507 #define   CIFSSEC_MAY_NTLMV2    0x00004
 508 #define   CIFSSEC_MAY_KRB5      0x00008
 509 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 510 #define   CIFSSEC_MAY_LANMAN    0x00010
 511 #define   CIFSSEC_MAY_PLNTXT    0x00020
 512 #else
 513 #define   CIFSSEC_MAY_LANMAN    0
 514 #define   CIFSSEC_MAY_PLNTXT    0
 515 #endif /* weak passwords */
 516 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 517
 518 #define   CIFSSEC_MUST_SIGN     0x01001
 519 /* note that only one of the following can be set so the
 520 result of setting MUST flags more than once will be to
 521 require use of the stronger protocol */
 522 #define   CIFSSEC_MUST_NTLM     0x02002
 523 #define   CIFSSEC_MUST_NTLMV2   0x04004
 524 #define   CIFSSEC_MUST_KRB5     0x08008
 525 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 526 #define   CIFSSEC_MUST_LANMAN   0x10010
 527 #define   CIFSSEC_MUST_PLNTXT   0x20020
 528 #ifdef CONFIG_CIFS_UPCALL
 529 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 530 #else
 531 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 532 #endif /* UPCALL */
 533 #else /* do not allow weak pw hash */
 534 #ifdef CONFIG_CIFS_UPCALL
 535 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 536 #else
 537 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 538 #endif /* UPCALL */
 539 #endif /* WEAK_PW_HASH */
 540 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 541
 542 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 543 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 544 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 545 /*
 546  *****************************************************************
 547  * All constants go here
 548  *****************************************************************
 549  */
 550
 551 #define UID_HASH (16)
 552
 553 /*
 554  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 555  * following to be declared.
 556  */
 557
 558 /****************************************************************************
 559  *  Locking notes.  All updates to global variables and lists should be
 560  *                  protected by spinlocks or semaphores.
 561  *
 562  *  Spinlocks
 563  *  ---------
 564  *  GlobalMid_Lock protects:
 565  *      list operations on pending_mid_q and oplockQ
 566  *      updates to XID counters, multiplex id  and SMB sequence numbers
 567  *  GlobalSMBSesLock protects:
 568  *      list operations on tcp and SMB session lists and tCon lists
 569  *  f_owner.lock protects certain per file struct operations
 570  *  mapping->page_lock protects certain per page operations
 571  *
 572  *  Semaphores
 573  *  ----------
 574  *  sesSem     operations on smb session
 575  *  tconSem    operations on tree connection
 576  *  fh_sem      file handle reconnection operations
 577  *
 578  ****************************************************************************/
 579
 580 #ifdef DECLARE_GLOBALS_HERE
 581 #define GLOBAL_EXTERN
 582 #else
 583 #define GLOBAL_EXTERN extern
 584 #endif
 585
 586 /*
 587  * The list of servers that did not respond with NT LM 0.12.
 588  * This list helps improve performance and eliminate the messages indicating
 589  * that we had a communications error talking to the server in this list.
 590  */
 591 /* Feature not supported */
 592 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 593
 594 /*
 595  * The following is a hash table of all the users we know about.
 596  */
 597 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 598
 599 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 600 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 601 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 602 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 603
 604 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 605
 606 /* Outstanding dir notify requests */
 607 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 608 /* DirNotify response queue */
 609 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 610
 611 /*
 612  * Global transaction id (XID) information
 613  */
 614 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 615 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 616 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 617 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 618                                           /* on midQ entries */
 619 GLOBAL_EXTERN char Local_System_Name[15];
 620
 621 /*
 622  *  Global counters, updated atomically
 623  */
 624 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 625 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 626 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 627 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 628 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 629
 630 /* Various Debug counters */
 631 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 632 #ifdef CONFIG_CIFS_STATS2
 633 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 634 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 635 #endif
 636 GLOBAL_EXTERN atomic_t smBufAllocCount;
 637 GLOBAL_EXTERN atomic_t midCount;
 638
 639 /* Misc globals */
 640 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 641                                 to be established on existing mount if we
 642                                 have the uid/password or Kerberos credential
 643                                 or equivalent for current user */
 644 GLOBAL_EXTERN unsigned int oplockEnabled;
 645 GLOBAL_EXTERN unsigned int experimEnabled;
 646 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 647 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 648                                 with more secure ntlmssp2 challenge/resp */
 649 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 650 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 651 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 652 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 653 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 654 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 655