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