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 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  * CIFS vfs client Status information (based on what we know.)
  74  */
  75
  76  /* associated with each tcp and smb session */
  77 enum statusEnum {
  78         CifsNew = 0,
  79         CifsGood,
  80         CifsExiting,
  81         CifsNeedReconnect
  82 };
  83
  84 enum securityEnum {
  85         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  86         LANMAN,                 /* Legacy LANMAN auth */
  87         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  88         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  89         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  90         NTLMSSP,                /* NTLMSSP via SPNEGO */
  91         Kerberos                /* Kerberos via SPNEGO */
  92 };
  93
  94 enum protocolEnum {
  95         IPV4 = 0,
  96         IPV6,
  97         SCTP
  98         /* Netbios frames protocol not supported at this time */
  99 };
 100
 101 struct mac_key {
 102         unsigned int len;
 103         union {
 104                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 105                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 106                 struct {
 107                         char key[16];
 108                         struct ntlmv2_resp resp;
 109                 } ntlmv2;
 110         } data;
 111 };
 112
 113 struct cifs_cred {
 114         int uid;
 115         int gid;
 116         int mode;
 117         int cecount;
 118         struct cifs_sid osid;
 119         struct cifs_sid gsid;
 120         struct cifs_ntace *ntaces;
 121         struct cifs_ace *aces;
 122 };
 123
 124 /*
 125  *****************************************************************
 126  * Except the CIFS PDUs themselves all the
 127  * globally interesting structs should go here
 128  *****************************************************************
 129  */
 130
 131 struct TCP_Server_Info {
 132         /* 15 character server name + 0x20 16th byte indicating type = srv */
 133         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 134         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 135         char *hostname; /* hostname portion of UNC string */
 136         struct socket *ssocket;
 137         union {
 138                 struct sockaddr_in sockAddr;
 139                 struct sockaddr_in6 sockAddr6;
 140         } addr;
 141         wait_queue_head_t response_q;
 142         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 143         struct list_head pending_mid_q;
 144         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 145         unsigned short server_codepage; /* codepage for the server    */
 146         unsigned long ip_address;       /* IP addr for the server if known */
 147         enum protocolEnum protocolType;
 148         char versionMajor;
 149         char versionMinor;
 150         unsigned svlocal:1;     /* local server or remote */
 151         atomic_t socketUseCount; /* number of open cifs sessions on socket */
 152         atomic_t inFlight;  /* number of requests on the wire to server */
 153 #ifdef CONFIG_CIFS_STATS2
 154         atomic_t inSend; /* requests trying to send */
 155         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 156 #endif
 157         enum statusEnum tcpStatus; /* what we think the status is */
 158         struct semaphore tcpSem;
 159         struct task_struct *tsk;
 160         char server_GUID[16];
 161         char secMode;
 162         enum securityEnum secType;
 163         unsigned int maxReq;    /* Clients should submit no more */
 164         /* than maxReq distinct unanswered SMBs to the server when using  */
 165         /* multiplexed reads or writes */
 166         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 167         /* message size the server can send or receive for non-raw SMBs */
 168         unsigned int maxRw;     /* maxRw specifies the maximum */
 169         /* message size the server can send or receive for */
 170         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 171         char sessid[4];         /* unique token id for this session */
 172         /* (returned on Negotiate */
 173         int capabilities; /* allow selective disabling of caps by smb sess */
 174         int timeAdj;  /* Adjust for difference in server time zone in sec */
 175         __u16 CurrentMid;         /* multiplex id - rotating counter */
 176         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 177         /* 16th byte of RFC1001 workstation name is always null */
 178         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 179         __u32 sequence_number; /* needed for CIFS PDU signature */
 180         struct mac_key mac_signing_key;
 181         char ntlmv2_hash[16];
 182         unsigned long lstrp; /* when we got last response from this server */
 183 };
 184
 185 /*
 186  * The following is our shortcut to user information.  We surface the uid,
 187  * and name. We always get the password on the fly in case it
 188  * has changed. We also hang a list of sessions owned by this user off here.
 189  */
 190 struct cifsUidInfo {
 191         struct list_head userList;
 192         struct list_head sessionList; /* SMB sessions for this user */
 193         uid_t linux_uid;
 194         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 195         /* BB may need ptr or callback for PAM or WinBind info */
 196 };
 197
 198 /*
 199  * Session structure.  One of these for each uid session with a particular host
 200  */
 201 struct cifsSesInfo {
 202         struct list_head cifsSessionList;
 203         struct semaphore sesSem;
 204 #if 0
 205         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 206 #endif
 207         struct TCP_Server_Info *server; /* pointer to server info */
 208         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 209         enum statusEnum status;
 210         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 211         __u16 ipc_tid;          /* special tid for connection to IPC share */
 212         __u16 flags;
 213         char *serverOS;         /* name of operating system underlying server */
 214         char *serverNOS;        /* name of network operating system of server */
 215         char *serverDomain;     /* security realm of server */
 216         int Suid;               /* remote smb uid  */
 217         uid_t linux_uid;        /* local Linux uid */
 218         int capabilities;
 219         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 220                                 TCP names - will ipv6 and sctp addresses fit? */
 221         char userName[MAX_USERNAME_SIZE + 1];
 222         char *domainName;
 223         char *password;
 224 };
 225 /* no more than one of the following three session flags may be set */
 226 #define CIFS_SES_NT4 1
 227 #define CIFS_SES_OS2 2
 228 #define CIFS_SES_W9X 4
 229 /* following flag is set for old servers such as OS2 (and Win95?)
 230    which do not negotiate NTLM or POSIX dialects, but instead
 231    negotiate one of the older LANMAN dialects */
 232 #define CIFS_SES_LANMAN 8
 233 /*
 234  * there is one of these for each connection to a resource on a particular
 235  * session
 236  */
 237 struct cifsTconInfo {
 238         struct list_head cifsConnectionList;
 239         struct list_head openFileList;
 240         struct semaphore tconSem;
 241         struct cifsSesInfo *ses;        /* pointer to session associated with */
 242         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 243         char *nativeFileSystem;
 244         __u16 tid;              /* The 2 byte tree id */
 245         __u16 Flags;            /* optional support bits */
 246         enum statusEnum tidStatus;
 247         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 248 #ifdef CONFIG_CIFS_STATS
 249         atomic_t num_smbs_sent;
 250         atomic_t num_writes;
 251         atomic_t num_reads;
 252         atomic_t num_oplock_brks;
 253         atomic_t num_opens;
 254         atomic_t num_closes;
 255         atomic_t num_deletes;
 256         atomic_t num_mkdirs;
 257         atomic_t num_rmdirs;
 258         atomic_t num_renames;
 259         atomic_t num_t2renames;
 260         atomic_t num_ffirst;
 261         atomic_t num_fnext;
 262         atomic_t num_fclose;
 263         atomic_t num_hardlinks;
 264         atomic_t num_symlinks;
 265         atomic_t num_locks;
 266         atomic_t num_acl_get;
 267         atomic_t num_acl_set;
 268 #ifdef CONFIG_CIFS_STATS2
 269         unsigned long long time_writes;
 270         unsigned long long time_reads;
 271         unsigned long long time_opens;
 272         unsigned long long time_deletes;
 273         unsigned long long time_closes;
 274         unsigned long long time_mkdirs;
 275         unsigned long long time_rmdirs;
 276         unsigned long long time_renames;
 277         unsigned long long time_t2renames;
 278         unsigned long long time_ffirst;
 279         unsigned long long time_fnext;
 280         unsigned long long time_fclose;
 281 #endif /* CONFIG_CIFS_STATS2 */
 282         __u64    bytes_read;
 283         __u64    bytes_written;
 284         spinlock_t stat_lock;
 285 #endif /* CONFIG_CIFS_STATS */
 286         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 287         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 288         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 289         unsigned ipc:1;         /* set if connection to IPC$ eg for RPC/PIPES */
 290         unsigned retry:1;
 291         unsigned nocase:1;
 292         unsigned unix_ext:1; /* if off disable Linux extensions to CIFS protocol
 293                                 for this mount even if server would support */
 294         /* BB add field for back pointer to sb struct(s)? */
 295 };
 296
 297 /*
 298  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 299  * This is used to track byte stream locks on the file
 300  */
 301 struct cifsLockInfo {
 302         struct list_head llist; /* pointer to next cifsLockInfo */
 303         __u64 offset;
 304         __u64 length;
 305         __u8 type;
 306 };
 307
 308 /*
 309  * One of these for each open instance of a file
 310  */
 311 struct cifs_search_info {
 312         loff_t index_of_last_entry;
 313         __u16 entries_in_buffer;
 314         __u16 info_level;
 315         __u32 resume_key;
 316         char *ntwrk_buf_start;
 317         char *srch_entries_start;
 318         char *presume_name;
 319         unsigned int resume_name_len;
 320         unsigned endOfSearch:1;
 321         unsigned emptyDir:1;
 322         unsigned unicode:1;
 323         unsigned smallBuf:1; /* so we know which buf_release function to call */
 324 };
 325
 326 struct cifsFileInfo {
 327         struct list_head tlist; /* pointer to next fid owned by tcon */
 328         struct list_head flist; /* next fid (file instance) for this inode */
 329         unsigned int uid;       /* allows finding which FileInfo structure */
 330         __u32 pid;              /* process id who opened file */
 331         __u16 netfid;           /* file id from remote */
 332         /* BB add lock scope info here if needed */ ;
 333         /* lock scope id (0 if none) */
 334         struct file *pfile; /* needed for writepage */
 335         struct inode *pInode; /* needed for oplock break */
 336         struct mutex lock_mutex;
 337         struct list_head llist; /* list of byte range locks we have. */
 338         unsigned closePend:1;   /* file is marked to close */
 339         unsigned invalidHandle:1;  /* file closed via session abend */
 340         unsigned messageMode:1;    /* for pipes: message vs byte mode */
 341         atomic_t wrtPending;   /* handle in use - defer close */
 342         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 343         char *search_resume_name; /* BB removeme BB */
 344         struct cifs_search_info srch_inf;
 345 };
 346
 347 /*
 348  * One of these for each file inode
 349  */
 350
 351 struct cifsInodeInfo {
 352         struct list_head lockList;
 353         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 354         struct list_head openFileList;
 355         int write_behind_rc;
 356         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 357         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 358         unsigned long time;     /* jiffies of last update/check of inode */
 359         unsigned clientCanCacheRead:1; /* read oplock */
 360         unsigned clientCanCacheAll:1;  /* read and writebehind oplock */
 361         unsigned oplockPending:1;
 362         struct inode vfs_inode;
 363 };
 364
 365 static inline struct cifsInodeInfo *
 366 CIFS_I(struct inode *inode)
 367 {
 368         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 369 }
 370
 371 static inline struct cifs_sb_info *
 372 CIFS_SB(struct super_block *sb)
 373 {
 374         return sb->s_fs_info;
 375 }
 376
 377 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 378 {
 379         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 380                 return '/';
 381         else
 382                 return '\\';
 383 }
 384
 385 #ifdef CONFIG_CIFS_STATS
 386 #define cifs_stats_inc atomic_inc
 387
 388 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 389                                             unsigned int bytes)
 390 {
 391         if (bytes) {
 392                 spin_lock(&tcon->stat_lock);
 393                 tcon->bytes_written += bytes;
 394                 spin_unlock(&tcon->stat_lock);
 395         }
 396 }
 397
 398 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 399                                          unsigned int bytes)
 400 {
 401         spin_lock(&tcon->stat_lock);
 402         tcon->bytes_read += bytes;
 403         spin_unlock(&tcon->stat_lock);
 404 }
 405 #else
 406
 407 #define  cifs_stats_inc(field) do {} while (0)
 408 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 409 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 410
 411 #endif
 412
 413 /* one of these for every pending CIFS request to the server */
 414 struct mid_q_entry {
 415         struct list_head qhead; /* mids waiting on reply from this server */
 416         __u16 mid;              /* multiplex id */
 417         __u16 pid;              /* process id */
 418         __u32 sequence_number;  /* for CIFS signing */
 419         unsigned long when_alloc;  /* when mid was created */
 420 #ifdef CONFIG_CIFS_STATS2
 421         unsigned long when_sent; /* time when smb send finished */
 422         unsigned long when_received; /* when demux complete (taken off wire) */
 423 #endif
 424         struct cifsSesInfo *ses;        /* smb was sent to this server */
 425         struct task_struct *tsk;        /* task waiting for response */
 426         struct smb_hdr *resp_buf;       /* response buffer */
 427         int midState;   /* wish this were enum but can not pass to wait_event */
 428         __u8 command;   /* smb command code */
 429         unsigned largeBuf:1;    /* if valid response, is pointer to large buf */
 430         unsigned multiRsp:1;   /* multiple trans2 responses for one request  */
 431         unsigned multiEnd:1; /* both received */
 432 };
 433
 434 struct oplock_q_entry {
 435         struct list_head qhead;
 436         struct inode *pinode;
 437         struct cifsTconInfo *tcon;
 438         __u16 netfid;
 439 };
 440
 441 /* for pending dnotify requests */
 442 struct dir_notify_req {
 443        struct list_head lhead;
 444        __le16 Pid;
 445        __le16 PidHigh;
 446        __u16 Mid;
 447        __u16 Tid;
 448        __u16 Uid;
 449        __u16 netfid;
 450        __u32 filter; /* CompletionFilter (for multishot) */
 451        int multishot;
 452        struct file *pfile;
 453 };
 454
 455 struct dfs_info3_param {
 456         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 457         int PathConsumed;
 458         int server_type;
 459         int ref_flag;
 460         char *path_name;
 461         char *node_name;
 462 };
 463
 464 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 465 {
 466         if (param) {
 467                 kfree(param->path_name);
 468                 kfree(param->node_name);
 469                 kfree(param);
 470         }
 471 }
 472
 473 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 474                                        int number_of_items)
 475 {
 476         int i;
 477         if ((number_of_items == 0) || (param == NULL))
 478                 return;
 479         for (i = 0; i < number_of_items; i++) {
 480                 kfree(param[i].path_name);
 481                 kfree(param[i].node_name);
 482         }
 483         kfree(param);
 484 }
 485
 486 #define   MID_FREE 0
 487 #define   MID_REQUEST_ALLOCATED 1
 488 #define   MID_REQUEST_SUBMITTED 2
 489 #define   MID_RESPONSE_RECEIVED 4
 490 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 491 #define   MID_NO_RESP_NEEDED 0x10
 492
 493 /* Types of response buffer returned from SendReceive2 */
 494 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 495 #define   CIFS_SMALL_BUFFER     1
 496 #define   CIFS_LARGE_BUFFER     2
 497 #define   CIFS_IOVEC            4    /* array of response buffers */
 498
 499 /* Type of Request to SendReceive2 */
 500 #define   CIFS_STD_OP           0    /* normal request timeout */
 501 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 502 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 503 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 504 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 505 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 506 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 507 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 508 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 509
 510 /* Security Flags: indicate type of session setup needed */
 511 #define   CIFSSEC_MAY_SIGN      0x00001
 512 #define   CIFSSEC_MAY_NTLM      0x00002
 513 #define   CIFSSEC_MAY_NTLMV2    0x00004
 514 #define   CIFSSEC_MAY_KRB5      0x00008
 515 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 516 #define   CIFSSEC_MAY_LANMAN    0x00010
 517 #define   CIFSSEC_MAY_PLNTXT    0x00020
 518 #else
 519 #define   CIFSSEC_MAY_LANMAN    0
 520 #define   CIFSSEC_MAY_PLNTXT    0
 521 #endif /* weak passwords */
 522 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 523
 524 #define   CIFSSEC_MUST_SIGN     0x01001
 525 /* note that only one of the following can be set so the
 526 result of setting MUST flags more than once will be to
 527 require use of the stronger protocol */
 528 #define   CIFSSEC_MUST_NTLM     0x02002
 529 #define   CIFSSEC_MUST_NTLMV2   0x04004
 530 #define   CIFSSEC_MUST_KRB5     0x08008
 531 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 532 #define   CIFSSEC_MUST_LANMAN   0x10010
 533 #define   CIFSSEC_MUST_PLNTXT   0x20020
 534 #ifdef CONFIG_CIFS_UPCALL
 535 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 536 #else
 537 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 538 #endif /* UPCALL */
 539 #else /* do not allow weak pw hash */
 540 #ifdef CONFIG_CIFS_UPCALL
 541 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 542 #else
 543 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 544 #endif /* UPCALL */
 545 #endif /* WEAK_PW_HASH */
 546 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 547
 548 #define   CIFSSEC_DEF  CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2
 549 #define   CIFSSEC_MAX  CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2
 550 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 551 /*
 552  *****************************************************************
 553  * All constants go here
 554  *****************************************************************
 555  */
 556
 557 #define UID_HASH (16)
 558
 559 /*
 560  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 561  * following to be declared.
 562  */
 563
 564 /****************************************************************************
 565  *  Locking notes.  All updates to global variables and lists should be
 566  *                  protected by spinlocks or semaphores.
 567  *
 568  *  Spinlocks
 569  *  ---------
 570  *  GlobalMid_Lock protects:
 571  *      list operations on pending_mid_q and oplockQ
 572  *      updates to XID counters, multiplex id  and SMB sequence numbers
 573  *  GlobalSMBSesLock protects:
 574  *      list operations on tcp and SMB session lists and tCon lists
 575  *  f_owner.lock protects certain per file struct operations
 576  *  mapping->page_lock protects certain per page operations
 577  *
 578  *  Semaphores
 579  *  ----------
 580  *  sesSem     operations on smb session
 581  *  tconSem    operations on tree connection
 582  *  fh_sem      file handle reconnection operations
 583  *
 584  ****************************************************************************/
 585
 586 #ifdef DECLARE_GLOBALS_HERE
 587 #define GLOBAL_EXTERN
 588 #else
 589 #define GLOBAL_EXTERN extern
 590 #endif
 591
 592 /*
 593  * The list of servers that did not respond with NT LM 0.12.
 594  * This list helps improve performance and eliminate the messages indicating
 595  * that we had a communications error talking to the server in this list.
 596  */
 597 /* Feature not supported */
 598 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 599
 600 /*
 601  * The following is a hash table of all the users we know about.
 602  */
 603 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 604
 605 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 606 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 607 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 608 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 609
 610 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 611
 612 /* Outstanding dir notify requests */
 613 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 614 /* DirNotify response queue */
 615 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 616
 617 /*
 618  * Global transaction id (XID) information
 619  */
 620 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 621 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 622 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 623 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 624                                           /* on midQ entries */
 625 GLOBAL_EXTERN char Local_System_Name[15];
 626
 627 /*
 628  *  Global counters, updated atomically
 629  */
 630 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 631 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 632 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 633 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 634 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 635
 636 /* Various Debug counters to remove someday (BB) */
 637 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 638 #ifdef CONFIG_CIFS_STATS2
 639 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 640 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 641 #endif
 642 GLOBAL_EXTERN atomic_t smBufAllocCount;
 643 GLOBAL_EXTERN atomic_t midCount;
 644
 645 /* Misc globals */
 646 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 647                                 to be established on existing mount if we
 648                                 have the uid/password or Kerberos credential
 649                                 or equivalent for current user */
 650 GLOBAL_EXTERN unsigned int oplockEnabled;
 651 GLOBAL_EXTERN unsigned int experimEnabled;
 652 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 653 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 654                                 with more secure ntlmssp2 challenge/resp */
 655 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 656 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 657 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 658 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 659 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 660 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 661