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 RFC1001_NAME_LEN 15
  51 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  52
  53 /* currently length of NIP6_FMT */
  54 #define SERVER_NAME_LENGTH 40
  55 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  56
  57 /* used to define string lengths for reversing unicode strings */
  58 /*         (256+1)*2 = 514                                     */
  59 /*           (max path length + 1 for null) * 2 for unicode    */
  60 #define MAX_NAME 514
  61
  62 #include "cifspdu.h"
  63
  64 #ifndef XATTR_DOS_ATTRIB
  65 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  66 #endif
  67
  68 /*
  69  * CIFS vfs client Status information (based on what we know.)
  70  */
  71
  72  /* associated with each tcp and smb session */
  73 enum statusEnum {
  74         CifsNew = 0,
  75         CifsGood,
  76         CifsExiting,
  77         CifsNeedReconnect
  78 };
  79
  80 enum securityEnum {
  81         PLAINTXT = 0,           /* Legacy with Plaintext passwords */
  82         LANMAN,                 /* Legacy LANMAN auth */
  83         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
  84         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
  85         RawNTLMSSP,             /* NTLMSSP without SPNEGO */
  86         NTLMSSP,                /* NTLMSSP via SPNEGO */
  87         Kerberos,               /* Kerberos via SPNEGO */
  88         MSKerberos,             /* MS Kerberos via SPNEGO */
  89 };
  90
  91 enum protocolEnum {
  92         TCP = 0,
  93         SCTP
  94         /* Netbios frames protocol not supported at this time */
  95 };
  96
  97 struct mac_key {
  98         unsigned int len;
  99         union {
 100                 char ntlm[CIFS_SESS_KEY_SIZE + 16];
 101                 char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 102                 struct {
 103                         char key[16];
 104                         struct ntlmv2_resp resp;
 105                 } ntlmv2;
 106         } data;
 107 };
 108
 109 struct cifs_cred {
 110         int uid;
 111         int gid;
 112         int mode;
 113         int cecount;
 114         struct cifs_sid osid;
 115         struct cifs_sid gsid;
 116         struct cifs_ntace *ntaces;
 117         struct cifs_ace *aces;
 118 };
 119
 120 /*
 121  *****************************************************************
 122  * Except the CIFS PDUs themselves all the
 123  * globally interesting structs should go here
 124  *****************************************************************
 125  */
 126
 127 struct TCP_Server_Info {
 128         struct list_head tcp_ses_list;
 129         struct list_head smb_ses_list;
 130         int srv_count; /* reference counter */
 131         /* 15 character server name + 0x20 16th byte indicating type = srv */
 132         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 133         char *hostname; /* hostname portion of UNC string */
 134         struct socket *ssocket;
 135         union {
 136                 struct sockaddr_in sockAddr;
 137                 struct sockaddr_in6 sockAddr6;
 138         } addr;
 139         wait_queue_head_t response_q;
 140         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 141         struct list_head pending_mid_q;
 142         void *Server_NlsInfo;   /* BB - placeholder for future NLS info  */
 143         unsigned short server_codepage; /* codepage for the server    */
 144         unsigned long ip_address;       /* IP addr for the server if known */
 145         enum protocolEnum protocolType;
 146         char versionMajor;
 147         char versionMinor;
 148         bool svlocal:1;                 /* local server or remote */
 149         bool noblocksnd;                /* use blocking sendmsg */
 150         bool noautotune;                /* do not autotune send buf sizes */
 151         atomic_t inFlight;  /* number of requests on the wire to server */
 152 #ifdef CONFIG_CIFS_STATS2
 153         atomic_t inSend; /* requests trying to send */
 154         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 155 #endif
 156         enum statusEnum tcpStatus; /* what we think the status is */
 157         struct mutex srv_mutex;
 158         struct task_struct *tsk;
 159         char server_GUID[16];
 160         char secMode;
 161         enum securityEnum secType;
 162         unsigned int maxReq;    /* Clients should submit no more */
 163         /* than maxReq distinct unanswered SMBs to the server when using  */
 164         /* multiplexed reads or writes */
 165         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 166         /* message size the server can send or receive for non-raw SMBs */
 167         unsigned int maxRw;     /* maxRw specifies the maximum */
 168         /* message size the server can send or receive for */
 169         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 170         char sessid[4];         /* unique token id for this session */
 171         /* (returned on Negotiate */
 172         int capabilities; /* allow selective disabling of caps by smb sess */
 173         int timeAdj;  /* Adjust for difference in server time zone in sec */
 174         __u16 CurrentMid;         /* multiplex id - rotating counter */
 175         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 176         /* 16th byte of RFC1001 workstation name is always null */
 177         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 178         __u32 sequence_number; /* needed for CIFS PDU signature */
 179         struct mac_key mac_signing_key;
 180         char ntlmv2_hash[16];
 181         unsigned long lstrp; /* when we got last response from this server */
 182 };
 183
 184 /*
 185  * The following is our shortcut to user information.  We surface the uid,
 186  * and name. We always get the password on the fly in case it
 187  * has changed. We also hang a list of sessions owned by this user off here.
 188  */
 189 struct cifsUidInfo {
 190         struct list_head userList;
 191         struct list_head sessionList; /* SMB sessions for this user */
 192         uid_t linux_uid;
 193         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 194         /* BB may need ptr or callback for PAM or WinBind info */
 195 };
 196
 197 /*
 198  * Session structure.  One of these for each uid session with a particular host
 199  */
 200 struct cifsSesInfo {
 201         struct list_head smb_ses_list;
 202         struct list_head tcon_list;
 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         int ses_count;          /* reference counter */
 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         bool need_reconnect:1; /* connection reset, uid now invalid */
 225 };
 226 /* no more than one of the following three session flags may be set */
 227 #define CIFS_SES_NT4 1
 228 #define CIFS_SES_OS2 2
 229 #define CIFS_SES_W9X 4
 230 /* following flag is set for old servers such as OS2 (and Win95?)
 231    which do not negotiate NTLM or POSIX dialects, but instead
 232    negotiate one of the older LANMAN dialects */
 233 #define CIFS_SES_LANMAN 8
 234 /*
 235  * there is one of these for each connection to a resource on a particular
 236  * session
 237  */
 238 struct cifsTconInfo {
 239         struct list_head tcon_list;
 240         int tc_count;
 241         struct list_head openFileList;
 242         struct cifsSesInfo *ses;        /* pointer to session associated with */
 243         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 244         char *nativeFileSystem;
 245         __u16 tid;              /* The 2 byte tree id */
 246         __u16 Flags;            /* optional support bits */
 247         enum statusEnum tidStatus;
 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         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 290         bool retry:1;
 291         bool nocase:1;
 292         bool seal:1;      /* transport encryption for this mounted share */
 293         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 294                                 for this mount even if server would support */
 295         bool local_lease:1; /* check leases (only) on local system not remote */
 296         bool need_reconnect:1; /* connection reset, tid now invalid */
 297         /* BB add field for back pointer to sb struct(s)? */
 298 };
 299
 300 /*
 301  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 302  * This is used to track byte stream locks on the file
 303  */
 304 struct cifsLockInfo {
 305         struct list_head llist; /* pointer to next cifsLockInfo */
 306         __u64 offset;
 307         __u64 length;
 308         __u8 type;
 309 };
 310
 311 /*
 312  * One of these for each open instance of a file
 313  */
 314 struct cifs_search_info {
 315         loff_t index_of_last_entry;
 316         __u16 entries_in_buffer;
 317         __u16 info_level;
 318         __u32 resume_key;
 319         char *ntwrk_buf_start;
 320         char *srch_entries_start;
 321         char *last_entry;
 322         char *presume_name;
 323         unsigned int resume_name_len;
 324         bool endOfSearch:1;
 325         bool emptyDir:1;
 326         bool unicode:1;
 327         bool smallBuf:1; /* so we know which buf_release function to call */
 328 };
 329
 330 struct cifsFileInfo {
 331         struct list_head tlist; /* pointer to next fid owned by tcon */
 332         struct list_head flist; /* next fid (file instance) for this inode */
 333         unsigned int uid;       /* allows finding which FileInfo structure */
 334         __u32 pid;              /* process id who opened file */
 335         __u16 netfid;           /* file id from remote */
 336         /* BB add lock scope info here if needed */ ;
 337         /* lock scope id (0 if none) */
 338         struct file *pfile; /* needed for writepage */
 339         struct inode *pInode; /* needed for oplock break */
 340         struct mutex lock_mutex;
 341         struct list_head llist; /* list of byte range locks we have. */
 342         bool closePend:1;       /* file is marked to close */
 343         bool invalidHandle:1;   /* file closed via session abend */
 344         bool messageMode:1;     /* for pipes: message vs byte mode */
 345         atomic_t wrtPending;   /* handle in use - defer close */
 346         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 347         struct cifs_search_info srch_inf;
 348 };
 349
 350 /*
 351  * One of these for each file inode
 352  */
 353
 354 struct cifsInodeInfo {
 355         struct list_head lockList;
 356         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 357         struct list_head openFileList;
 358         int write_behind_rc;
 359         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 360         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 361         unsigned long time;     /* jiffies of last update/check of inode */
 362         bool clientCanCacheRead:1;      /* read oplock */
 363         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 364         bool oplockPending:1;
 365         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 366         struct inode vfs_inode;
 367 };
 368
 369 static inline struct cifsInodeInfo *
 370 CIFS_I(struct inode *inode)
 371 {
 372         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 373 }
 374
 375 static inline struct cifs_sb_info *
 376 CIFS_SB(struct super_block *sb)
 377 {
 378         return sb->s_fs_info;
 379 }
 380
 381 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 382 {
 383         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 384                 return '/';
 385         else
 386                 return '\\';
 387 }
 388
 389 #ifdef CONFIG_CIFS_STATS
 390 #define cifs_stats_inc atomic_inc
 391
 392 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 393                                             unsigned int bytes)
 394 {
 395         if (bytes) {
 396                 spin_lock(&tcon->stat_lock);
 397                 tcon->bytes_written += bytes;
 398                 spin_unlock(&tcon->stat_lock);
 399         }
 400 }
 401
 402 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 403                                          unsigned int bytes)
 404 {
 405         spin_lock(&tcon->stat_lock);
 406         tcon->bytes_read += bytes;
 407         spin_unlock(&tcon->stat_lock);
 408 }
 409 #else
 410
 411 #define  cifs_stats_inc(field) do {} while (0)
 412 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 413 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 414
 415 #endif
 416
 417 /* one of these for every pending CIFS request to the server */
 418 struct mid_q_entry {
 419         struct list_head qhead; /* mids waiting on reply from this server */
 420         __u16 mid;              /* multiplex id */
 421         __u16 pid;              /* process id */
 422         __u32 sequence_number;  /* for CIFS signing */
 423         unsigned long when_alloc;  /* when mid was created */
 424 #ifdef CONFIG_CIFS_STATS2
 425         unsigned long when_sent; /* time when smb send finished */
 426         unsigned long when_received; /* when demux complete (taken off wire) */
 427 #endif
 428         struct task_struct *tsk;        /* task waiting for response */
 429         struct smb_hdr *resp_buf;       /* response buffer */
 430         int midState;   /* wish this were enum but can not pass to wait_event */
 431         __u8 command;   /* smb command code */
 432         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 433         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 434         bool multiEnd:1;        /* both received */
 435 };
 436
 437 struct oplock_q_entry {
 438         struct list_head qhead;
 439         struct inode *pinode;
 440         struct cifsTconInfo *tcon;
 441         __u16 netfid;
 442 };
 443
 444 /* for pending dnotify requests */
 445 struct dir_notify_req {
 446        struct list_head lhead;
 447        __le16 Pid;
 448        __le16 PidHigh;
 449        __u16 Mid;
 450        __u16 Tid;
 451        __u16 Uid;
 452        __u16 netfid;
 453        __u32 filter; /* CompletionFilter (for multishot) */
 454        int multishot;
 455        struct file *pfile;
 456 };
 457
 458 struct dfs_info3_param {
 459         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 460         int path_consumed;
 461         int server_type;
 462         int ref_flag;
 463         char *path_name;
 464         char *node_name;
 465 };
 466
 467 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 468 {
 469         if (param) {
 470                 kfree(param->path_name);
 471                 kfree(param->node_name);
 472                 kfree(param);
 473         }
 474 }
 475
 476 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 477                                        int number_of_items)
 478 {
 479         int i;
 480         if ((number_of_items == 0) || (param == NULL))
 481                 return;
 482         for (i = 0; i < number_of_items; i++) {
 483                 kfree(param[i].path_name);
 484                 kfree(param[i].node_name);
 485         }
 486         kfree(param);
 487 }
 488
 489 #define   MID_FREE 0
 490 #define   MID_REQUEST_ALLOCATED 1
 491 #define   MID_REQUEST_SUBMITTED 2
 492 #define   MID_RESPONSE_RECEIVED 4
 493 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 494 #define   MID_NO_RESP_NEEDED 0x10
 495
 496 /* Types of response buffer returned from SendReceive2 */
 497 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 498 #define   CIFS_SMALL_BUFFER     1
 499 #define   CIFS_LARGE_BUFFER     2
 500 #define   CIFS_IOVEC            4    /* array of response buffers */
 501
 502 /* Type of Request to SendReceive2 */
 503 #define   CIFS_STD_OP           0    /* normal request timeout */
 504 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 505 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 506 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 507 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 508 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 509 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 510 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 511 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 512
 513 /* Security Flags: indicate type of session setup needed */
 514 #define   CIFSSEC_MAY_SIGN      0x00001
 515 #define   CIFSSEC_MAY_NTLM      0x00002
 516 #define   CIFSSEC_MAY_NTLMV2    0x00004
 517 #define   CIFSSEC_MAY_KRB5      0x00008
 518 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 519 #define   CIFSSEC_MAY_LANMAN    0x00010
 520 #define   CIFSSEC_MAY_PLNTXT    0x00020
 521 #else
 522 #define   CIFSSEC_MAY_LANMAN    0
 523 #define   CIFSSEC_MAY_PLNTXT    0
 524 #endif /* weak passwords */
 525 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 526
 527 #define   CIFSSEC_MUST_SIGN     0x01001
 528 /* note that only one of the following can be set so the
 529 result of setting MUST flags more than once will be to
 530 require use of the stronger protocol */
 531 #define   CIFSSEC_MUST_NTLM     0x02002
 532 #define   CIFSSEC_MUST_NTLMV2   0x04004
 533 #define   CIFSSEC_MUST_KRB5     0x08008
 534 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 535 #define   CIFSSEC_MUST_LANMAN   0x10010
 536 #define   CIFSSEC_MUST_PLNTXT   0x20020
 537 #ifdef CONFIG_CIFS_UPCALL
 538 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 539 #else
 540 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 541 #endif /* UPCALL */
 542 #else /* do not allow weak pw hash */
 543 #ifdef CONFIG_CIFS_UPCALL
 544 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 545 #else
 546 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 547 #endif /* UPCALL */
 548 #endif /* WEAK_PW_HASH */
 549 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 550
 551 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 552 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 553 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 554 /*
 555  *****************************************************************
 556  * All constants go here
 557  *****************************************************************
 558  */
 559
 560 #define UID_HASH (16)
 561
 562 /*
 563  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 564  * following to be declared.
 565  */
 566
 567 /****************************************************************************
 568  *  Locking notes.  All updates to global variables and lists should be
 569  *                  protected by spinlocks or semaphores.
 570  *
 571  *  Spinlocks
 572  *  ---------
 573  *  GlobalMid_Lock protects:
 574  *      list operations on pending_mid_q and oplockQ
 575  *      updates to XID counters, multiplex id  and SMB sequence numbers
 576  *  GlobalSMBSesLock protects:
 577  *      list operations on tcp and SMB session lists and tCon lists
 578  *  f_owner.lock protects certain per file struct operations
 579  *  mapping->page_lock protects certain per page operations
 580  *
 581  *  Semaphores
 582  *  ----------
 583  *  sesSem     operations on smb session
 584  *  tconSem    operations on tree connection
 585  *  fh_sem      file handle reconnection operations
 586  *
 587  ****************************************************************************/
 588
 589 #ifdef DECLARE_GLOBALS_HERE
 590 #define GLOBAL_EXTERN
 591 #else
 592 #define GLOBAL_EXTERN extern
 593 #endif
 594
 595 /*
 596  * the list of TCP_Server_Info structures, ie each of the sockets
 597  * connecting our client to a distinct server (ip address), is
 598  * chained together by cifs_tcp_ses_list. The list of all our SMB
 599  * sessions (and from that the tree connections) can be found
 600  * by iterating over cifs_tcp_ses_list
 601  */
 602 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 603
 604 /*
 605  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 606  * tcp session, and the list of tcon's per smb session. It also protects
 607  * the reference counters for the server, smb session, and tcon. Finally,
 608  * changes to the tcon->tidStatus should be done while holding this lock.
 609  */
 610 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 611
 612 /*
 613  * This lock protects the cifs_file->llist and cifs_file->flist
 614  * list operations, and updates to some flags (cifs_file->invalidHandle)
 615  * It will be moved to either use the tcon->stat_lock or equivalent later.
 616  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 617  * the cifs_tcp_ses_lock must be grabbed first and released last.
 618  */
 619 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 620
 621 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 622
 623 /* Outstanding dir notify requests */
 624 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 625 /* DirNotify response queue */
 626 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 627
 628 /*
 629  * Global transaction id (XID) information
 630  */
 631 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 632 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 633 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 634 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 635                                           /* on midQ entries */
 636 GLOBAL_EXTERN char Local_System_Name[15];
 637
 638 /*
 639  *  Global counters, updated atomically
 640  */
 641 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 642 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 643 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 644 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 645 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 646
 647 /* Various Debug counters */
 648 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 649 #ifdef CONFIG_CIFS_STATS2
 650 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 651 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 652 #endif
 653 GLOBAL_EXTERN atomic_t smBufAllocCount;
 654 GLOBAL_EXTERN atomic_t midCount;
 655
 656 /* Misc globals */
 657 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 658                                 to be established on existing mount if we
 659                                 have the uid/password or Kerberos credential
 660                                 or equivalent for current user */
 661 GLOBAL_EXTERN unsigned int oplockEnabled;
 662 GLOBAL_EXTERN unsigned int experimEnabled;
 663 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 664 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 665                                 with more secure ntlmssp2 challenge/resp */
 666 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 667 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 668 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 669 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 670 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 671 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 672