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         TCP = 0,
  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         struct list_head tcp_ses_list;
 125         struct list_head smb_ses_list;
 126         int srv_count; /* reference counter */
 127         /* 15 character server name + 0x20 16th byte indicating type = srv */
 128         char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 129         char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
 130         char *hostname; /* hostname portion of UNC string */
 131         struct socket *ssocket;
 132         union {
 133                 struct sockaddr_in sockAddr;
 134                 struct sockaddr_in6 sockAddr6;
 135         } addr;
 136         wait_queue_head_t response_q;
 137         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 138         struct list_head pending_mid_q;
 139         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 140         unsigned short server_codepage; /* codepage for the server    */
 141         unsigned long ip_address;       /* IP addr for the server if known */
 142         enum protocolEnum protocolType;
 143         char versionMajor;
 144         char versionMinor;
 145         bool svlocal:1;                 /* local server or remote */
 146         bool noblocksnd;                /* use blocking sendmsg */
 147         bool noautotune;                /* do not autotune send buf sizes */
 148         atomic_t inFlight;  /* number of requests on the wire to server */
 149 #ifdef CONFIG_CIFS_STATS2
 150         atomic_t inSend; /* requests trying to send */
 151         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 152 #endif
 153         enum statusEnum tcpStatus; /* what we think the status is */
 154         struct semaphore tcpSem;
 155         struct task_struct *tsk;
 156         char server_GUID[16];
 157         char secMode;
 158         enum securityEnum secType;
 159         unsigned int maxReq;    /* Clients should submit no more */
 160         /* than maxReq distinct unanswered SMBs to the server when using  */
 161         /* multiplexed reads or writes */
 162         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 163         /* message size the server can send or receive for non-raw SMBs */
 164         unsigned int maxRw;     /* maxRw specifies the maximum */
 165         /* message size the server can send or receive for */
 166         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 167         char sessid[4];         /* unique token id for this session */
 168         /* (returned on Negotiate */
 169         int capabilities; /* allow selective disabling of caps by smb sess */
 170         int timeAdj;  /* Adjust for difference in server time zone in sec */
 171         __u16 CurrentMid;         /* multiplex id - rotating counter */
 172         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 173         /* 16th byte of RFC1001 workstation name is always null */
 174         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 175         __u32 sequence_number; /* needed for CIFS PDU signature */
 176         struct mac_key mac_signing_key;
 177         char ntlmv2_hash[16];
 178         unsigned long lstrp; /* when we got last response from this server */
 179 };
 180
 181 /*
 182  * The following is our shortcut to user information.  We surface the uid,
 183  * and name. We always get the password on the fly in case it
 184  * has changed. We also hang a list of sessions owned by this user off here.
 185  */
 186 struct cifsUidInfo {
 187         struct list_head userList;
 188         struct list_head sessionList; /* SMB sessions for this user */
 189         uid_t linux_uid;
 190         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 191         /* BB may need ptr or callback for PAM or WinBind info */
 192 };
 193
 194 /*
 195  * Session structure.  One of these for each uid session with a particular host
 196  */
 197 struct cifsSesInfo {
 198         struct list_head smb_ses_list;
 199         struct list_head tcon_list;
 200         struct semaphore sesSem;
 201 #if 0
 202         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 203 #endif
 204         struct TCP_Server_Info *server; /* pointer to server info */
 205         int ses_count;          /* reference counter */
 206         enum statusEnum status;
 207         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 208         __u16 ipc_tid;          /* special tid for connection to IPC share */
 209         __u16 flags;
 210         char *serverOS;         /* name of operating system underlying server */
 211         char *serverNOS;        /* name of network operating system of server */
 212         char *serverDomain;     /* security realm of server */
 213         int Suid;               /* remote smb uid  */
 214         uid_t linux_uid;        /* local Linux uid */
 215         int capabilities;
 216         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 217                                 TCP names - will ipv6 and sctp addresses fit? */
 218         char userName[MAX_USERNAME_SIZE + 1];
 219         char *domainName;
 220         char *password;
 221         bool need_reconnect:1; /* connection reset, uid now invalid */
 222 };
 223 /* no more than one of the following three session flags may be set */
 224 #define CIFS_SES_NT4 1
 225 #define CIFS_SES_OS2 2
 226 #define CIFS_SES_W9X 4
 227 /* following flag is set for old servers such as OS2 (and Win95?)
 228    which do not negotiate NTLM or POSIX dialects, but instead
 229    negotiate one of the older LANMAN dialects */
 230 #define CIFS_SES_LANMAN 8
 231 /*
 232  * there is one of these for each connection to a resource on a particular
 233  * session
 234  */
 235 struct cifsTconInfo {
 236         struct list_head tcon_list;
 237         int tc_count;
 238         struct list_head openFileList;
 239         struct cifsSesInfo *ses;        /* pointer to session associated with */
 240         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 241         char *nativeFileSystem;
 242         __u16 tid;              /* The 2 byte tree id */
 243         __u16 Flags;            /* optional support bits */
 244         enum statusEnum tidStatus;
 245 #ifdef CONFIG_CIFS_STATS
 246         atomic_t num_smbs_sent;
 247         atomic_t num_writes;
 248         atomic_t num_reads;
 249         atomic_t num_oplock_brks;
 250         atomic_t num_opens;
 251         atomic_t num_closes;
 252         atomic_t num_deletes;
 253         atomic_t num_mkdirs;
 254         atomic_t num_rmdirs;
 255         atomic_t num_renames;
 256         atomic_t num_t2renames;
 257         atomic_t num_ffirst;
 258         atomic_t num_fnext;
 259         atomic_t num_fclose;
 260         atomic_t num_hardlinks;
 261         atomic_t num_symlinks;
 262         atomic_t num_locks;
 263         atomic_t num_acl_get;
 264         atomic_t num_acl_set;
 265 #ifdef CONFIG_CIFS_STATS2
 266         unsigned long long time_writes;
 267         unsigned long long time_reads;
 268         unsigned long long time_opens;
 269         unsigned long long time_deletes;
 270         unsigned long long time_closes;
 271         unsigned long long time_mkdirs;
 272         unsigned long long time_rmdirs;
 273         unsigned long long time_renames;
 274         unsigned long long time_t2renames;
 275         unsigned long long time_ffirst;
 276         unsigned long long time_fnext;
 277         unsigned long long time_fclose;
 278 #endif /* CONFIG_CIFS_STATS2 */
 279         __u64    bytes_read;
 280         __u64    bytes_written;
 281         spinlock_t stat_lock;
 282 #endif /* CONFIG_CIFS_STATS */
 283         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 284         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 285         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 286         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 287         bool retry:1;
 288         bool nocase:1;
 289         bool seal:1;      /* transport encryption for this mounted share */
 290         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 291                                 for this mount even if server would support */
 292         bool local_lease:1; /* check leases (only) on local system not remote */
 293         bool need_reconnect:1; /* connection reset, tid now invalid */
 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 *last_entry;
 319         char *presume_name;
 320         unsigned int resume_name_len;
 321         bool endOfSearch:1;
 322         bool emptyDir:1;
 323         bool unicode:1;
 324         bool smallBuf:1; /* so we know which buf_release function to call */
 325 };
 326
 327 struct cifsFileInfo {
 328         struct list_head tlist; /* pointer to next fid owned by tcon */
 329         struct list_head flist; /* next fid (file instance) for this inode */
 330         unsigned int uid;       /* allows finding which FileInfo structure */
 331         __u32 pid;              /* process id who opened file */
 332         __u16 netfid;           /* file id from remote */
 333         /* BB add lock scope info here if needed */ ;
 334         /* lock scope id (0 if none) */
 335         struct file *pfile; /* needed for writepage */
 336         struct inode *pInode; /* needed for oplock break */
 337         struct mutex lock_mutex;
 338         struct list_head llist; /* list of byte range locks we have. */
 339         bool closePend:1;       /* file is marked to close */
 340         bool invalidHandle:1;   /* file closed via session abend */
 341         bool messageMode:1;     /* for pipes: message vs byte mode */
 342         atomic_t wrtPending;   /* handle in use - defer close */
 343         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 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         bool clientCanCacheRead:1;      /* read oplock */
 360         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 361         bool oplockPending:1;
 362         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 363         struct inode vfs_inode;
 364 };
 365
 366 static inline struct cifsInodeInfo *
 367 CIFS_I(struct inode *inode)
 368 {
 369         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 370 }
 371
 372 static inline struct cifs_sb_info *
 373 CIFS_SB(struct super_block *sb)
 374 {
 375         return sb->s_fs_info;
 376 }
 377
 378 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 379 {
 380         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 381                 return '/';
 382         else
 383                 return '\\';
 384 }
 385
 386 #ifdef CONFIG_CIFS_STATS
 387 #define cifs_stats_inc atomic_inc
 388
 389 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 390                                             unsigned int bytes)
 391 {
 392         if (bytes) {
 393                 spin_lock(&tcon->stat_lock);
 394                 tcon->bytes_written += bytes;
 395                 spin_unlock(&tcon->stat_lock);
 396         }
 397 }
 398
 399 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 400                                          unsigned int bytes)
 401 {
 402         spin_lock(&tcon->stat_lock);
 403         tcon->bytes_read += bytes;
 404         spin_unlock(&tcon->stat_lock);
 405 }
 406 #else
 407
 408 #define  cifs_stats_inc(field) do {} while (0)
 409 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 410 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 411
 412 #endif
 413
 414 /* one of these for every pending CIFS request to the server */
 415 struct mid_q_entry {
 416         struct list_head qhead; /* mids waiting on reply from this server */
 417         __u16 mid;              /* multiplex id */
 418         __u16 pid;              /* process id */
 419         __u32 sequence_number;  /* for CIFS signing */
 420         unsigned long when_alloc;  /* when mid was created */
 421 #ifdef CONFIG_CIFS_STATS2
 422         unsigned long when_sent; /* time when smb send finished */
 423         unsigned long when_received; /* when demux complete (taken off wire) */
 424 #endif
 425         struct cifsSesInfo *ses;        /* smb was sent to this server */
 426         struct task_struct *tsk;        /* task waiting for response */
 427         struct smb_hdr *resp_buf;       /* response buffer */
 428         int midState;   /* wish this were enum but can not pass to wait_event */
 429         __u8 command;   /* smb command code */
 430         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 431         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 432         bool multiEnd:1;        /* both received */
 433 };
 434
 435 struct oplock_q_entry {
 436         struct list_head qhead;
 437         struct inode *pinode;
 438         struct cifsTconInfo *tcon;
 439         __u16 netfid;
 440 };
 441
 442 /* for pending dnotify requests */
 443 struct dir_notify_req {
 444        struct list_head lhead;
 445        __le16 Pid;
 446        __le16 PidHigh;
 447        __u16 Mid;
 448        __u16 Tid;
 449        __u16 Uid;
 450        __u16 netfid;
 451        __u32 filter; /* CompletionFilter (for multishot) */
 452        int multishot;
 453        struct file *pfile;
 454 };
 455
 456 struct dfs_info3_param {
 457         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 458         int path_consumed;
 459         int server_type;
 460         int ref_flag;
 461         char *path_name;
 462         char *node_name;
 463 };
 464
 465 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 466 {
 467         if (param) {
 468                 kfree(param->path_name);
 469                 kfree(param->node_name);
 470                 kfree(param);
 471         }
 472 }
 473
 474 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 475                                        int number_of_items)
 476 {
 477         int i;
 478         if ((number_of_items == 0) || (param == NULL))
 479                 return;
 480         for (i = 0; i < number_of_items; i++) {
 481                 kfree(param[i].path_name);
 482                 kfree(param[i].node_name);
 483         }
 484         kfree(param);
 485 }
 486
 487 #define   MID_FREE 0
 488 #define   MID_REQUEST_ALLOCATED 1
 489 #define   MID_REQUEST_SUBMITTED 2
 490 #define   MID_RESPONSE_RECEIVED 4
 491 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 492 #define   MID_NO_RESP_NEEDED 0x10
 493
 494 /* Types of response buffer returned from SendReceive2 */
 495 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 496 #define   CIFS_SMALL_BUFFER     1
 497 #define   CIFS_LARGE_BUFFER     2
 498 #define   CIFS_IOVEC            4    /* array of response buffers */
 499
 500 /* Type of Request to SendReceive2 */
 501 #define   CIFS_STD_OP           0    /* normal request timeout */
 502 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 503 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 504 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 505 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 506 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 507 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 508 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 509 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 510
 511 /* Security Flags: indicate type of session setup needed */
 512 #define   CIFSSEC_MAY_SIGN      0x00001
 513 #define   CIFSSEC_MAY_NTLM      0x00002
 514 #define   CIFSSEC_MAY_NTLMV2    0x00004
 515 #define   CIFSSEC_MAY_KRB5      0x00008
 516 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 517 #define   CIFSSEC_MAY_LANMAN    0x00010
 518 #define   CIFSSEC_MAY_PLNTXT    0x00020
 519 #else
 520 #define   CIFSSEC_MAY_LANMAN    0
 521 #define   CIFSSEC_MAY_PLNTXT    0
 522 #endif /* weak passwords */
 523 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 524
 525 #define   CIFSSEC_MUST_SIGN     0x01001
 526 /* note that only one of the following can be set so the
 527 result of setting MUST flags more than once will be to
 528 require use of the stronger protocol */
 529 #define   CIFSSEC_MUST_NTLM     0x02002
 530 #define   CIFSSEC_MUST_NTLMV2   0x04004
 531 #define   CIFSSEC_MUST_KRB5     0x08008
 532 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 533 #define   CIFSSEC_MUST_LANMAN   0x10010
 534 #define   CIFSSEC_MUST_PLNTXT   0x20020
 535 #ifdef CONFIG_CIFS_UPCALL
 536 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 537 #else
 538 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 539 #endif /* UPCALL */
 540 #else /* do not allow weak pw hash */
 541 #ifdef CONFIG_CIFS_UPCALL
 542 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 543 #else
 544 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 545 #endif /* UPCALL */
 546 #endif /* WEAK_PW_HASH */
 547 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 548
 549 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 550 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 551 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 552 /*
 553  *****************************************************************
 554  * All constants go here
 555  *****************************************************************
 556  */
 557
 558 #define UID_HASH (16)
 559
 560 /*
 561  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 562  * following to be declared.
 563  */
 564
 565 /****************************************************************************
 566  *  Locking notes.  All updates to global variables and lists should be
 567  *                  protected by spinlocks or semaphores.
 568  *
 569  *  Spinlocks
 570  *  ---------
 571  *  GlobalMid_Lock protects:
 572  *      list operations on pending_mid_q and oplockQ
 573  *      updates to XID counters, multiplex id  and SMB sequence numbers
 574  *  GlobalSMBSesLock protects:
 575  *      list operations on tcp and SMB session lists and tCon lists
 576  *  f_owner.lock protects certain per file struct operations
 577  *  mapping->page_lock protects certain per page operations
 578  *
 579  *  Semaphores
 580  *  ----------
 581  *  sesSem     operations on smb session
 582  *  tconSem    operations on tree connection
 583  *  fh_sem      file handle reconnection operations
 584  *
 585  ****************************************************************************/
 586
 587 #ifdef DECLARE_GLOBALS_HERE
 588 #define GLOBAL_EXTERN
 589 #else
 590 #define GLOBAL_EXTERN extern
 591 #endif
 592
 593 /*
 594  * the list of TCP_Server_Info structures, ie each of the sockets
 595  * connecting our client to a distinct server (ip address), is
 596  * chained together by cifs_tcp_ses_list. The list of all our SMB
 597  * sessions (and from that the tree connections) can be found
 598  * by iterating over cifs_tcp_ses_list
 599  */
 600 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 601
 602 /*
 603  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 604  * tcp session, and the list of tcon's per smb session. It also protects
 605  * the reference counters for the server, smb session, and tcon. Finally,
 606  * changes to the tcon->tidStatus should be done while holding this lock.
 607  */
 608 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 609 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 610
 611 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 612
 613 /* Outstanding dir notify requests */
 614 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 615 /* DirNotify response queue */
 616 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 617
 618 /*
 619  * Global transaction id (XID) information
 620  */
 621 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 622 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 623 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 624 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 625                                           /* on midQ entries */
 626 GLOBAL_EXTERN char Local_System_Name[15];
 627
 628 /*
 629  *  Global counters, updated atomically
 630  */
 631 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 632 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 633 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 634 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 635 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 636
 637 /* Various Debug counters */
 638 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 639 #ifdef CONFIG_CIFS_STATS2
 640 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 641 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 642 #endif
 643 GLOBAL_EXTERN atomic_t smBufAllocCount;
 644 GLOBAL_EXTERN atomic_t midCount;
 645
 646 /* Misc globals */
 647 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 648                                 to be established on existing mount if we
 649                                 have the uid/password or Kerberos credential
 650                                 or equivalent for current user */
 651 GLOBAL_EXTERN unsigned int oplockEnabled;
 652 GLOBAL_EXTERN unsigned int experimEnabled;
 653 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 654 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 655                                 with more secure ntlmssp2 challenge/resp */
 656 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 657 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 658 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 659 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 660 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 661 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 662