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 need_reconnect:1; /* connection reset, tid now invalid */
 293         /* BB add field for back pointer to sb struct(s)? */
 294 };
 295
 296 /*
 297  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 298  * This is used to track byte stream locks on the file
 299  */
 300 struct cifsLockInfo {
 301         struct list_head llist; /* pointer to next cifsLockInfo */
 302         __u64 offset;
 303         __u64 length;
 304         __u8 type;
 305 };
 306
 307 /*
 308  * One of these for each open instance of a file
 309  */
 310 struct cifs_search_info {
 311         loff_t index_of_last_entry;
 312         __u16 entries_in_buffer;
 313         __u16 info_level;
 314         __u32 resume_key;
 315         char *ntwrk_buf_start;
 316         char *srch_entries_start;
 317         char *last_entry;
 318         char *presume_name;
 319         unsigned int resume_name_len;
 320         bool endOfSearch:1;
 321         bool emptyDir:1;
 322         bool unicode:1;
 323         bool 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         bool closePend:1;       /* file is marked to close */
 339         bool invalidHandle:1;   /* file closed via session abend */
 340         bool 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         struct cifs_search_info srch_inf;
 344 };
 345
 346 /*
 347  * One of these for each file inode
 348  */
 349
 350 struct cifsInodeInfo {
 351         struct list_head lockList;
 352         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 353         struct list_head openFileList;
 354         int write_behind_rc;
 355         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 356         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 357         unsigned long time;     /* jiffies of last update/check of inode */
 358         bool clientCanCacheRead:1;      /* read oplock */
 359         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 360         bool oplockPending:1;
 361         struct inode vfs_inode;
 362 };
 363
 364 static inline struct cifsInodeInfo *
 365 CIFS_I(struct inode *inode)
 366 {
 367         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 368 }
 369
 370 static inline struct cifs_sb_info *
 371 CIFS_SB(struct super_block *sb)
 372 {
 373         return sb->s_fs_info;
 374 }
 375
 376 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 377 {
 378         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 379                 return '/';
 380         else
 381                 return '\\';
 382 }
 383
 384 #ifdef CONFIG_CIFS_STATS
 385 #define cifs_stats_inc atomic_inc
 386
 387 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 388                                             unsigned int bytes)
 389 {
 390         if (bytes) {
 391                 spin_lock(&tcon->stat_lock);
 392                 tcon->bytes_written += bytes;
 393                 spin_unlock(&tcon->stat_lock);
 394         }
 395 }
 396
 397 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 398                                          unsigned int bytes)
 399 {
 400         spin_lock(&tcon->stat_lock);
 401         tcon->bytes_read += bytes;
 402         spin_unlock(&tcon->stat_lock);
 403 }
 404 #else
 405
 406 #define  cifs_stats_inc(field) do {} while (0)
 407 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 408 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 409
 410 #endif
 411
 412 /* one of these for every pending CIFS request to the server */
 413 struct mid_q_entry {
 414         struct list_head qhead; /* mids waiting on reply from this server */
 415         __u16 mid;              /* multiplex id */
 416         __u16 pid;              /* process id */
 417         __u32 sequence_number;  /* for CIFS signing */
 418         unsigned long when_alloc;  /* when mid was created */
 419 #ifdef CONFIG_CIFS_STATS2
 420         unsigned long when_sent; /* time when smb send finished */
 421         unsigned long when_received; /* when demux complete (taken off wire) */
 422 #endif
 423         struct cifsSesInfo *ses;        /* smb was sent to this server */
 424         struct task_struct *tsk;        /* task waiting for response */
 425         struct smb_hdr *resp_buf;       /* response buffer */
 426         int midState;   /* wish this were enum but can not pass to wait_event */
 427         __u8 command;   /* smb command code */
 428         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 429         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 430         bool multiEnd:1;        /* both received */
 431 };
 432
 433 struct oplock_q_entry {
 434         struct list_head qhead;
 435         struct inode *pinode;
 436         struct cifsTconInfo *tcon;
 437         __u16 netfid;
 438 };
 439
 440 /* for pending dnotify requests */
 441 struct dir_notify_req {
 442        struct list_head lhead;
 443        __le16 Pid;
 444        __le16 PidHigh;
 445        __u16 Mid;
 446        __u16 Tid;
 447        __u16 Uid;
 448        __u16 netfid;
 449        __u32 filter; /* CompletionFilter (for multishot) */
 450        int multishot;
 451        struct file *pfile;
 452 };
 453
 454 struct dfs_info3_param {
 455         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 456         int path_consumed;
 457         int server_type;
 458         int ref_flag;
 459         char *path_name;
 460         char *node_name;
 461 };
 462
 463 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 464 {
 465         if (param) {
 466                 kfree(param->path_name);
 467                 kfree(param->node_name);
 468                 kfree(param);
 469         }
 470 }
 471
 472 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 473                                        int number_of_items)
 474 {
 475         int i;
 476         if ((number_of_items == 0) || (param == NULL))
 477                 return;
 478         for (i = 0; i < number_of_items; i++) {
 479                 kfree(param[i].path_name);
 480                 kfree(param[i].node_name);
 481         }
 482         kfree(param);
 483 }
 484
 485 #define   MID_FREE 0
 486 #define   MID_REQUEST_ALLOCATED 1
 487 #define   MID_REQUEST_SUBMITTED 2
 488 #define   MID_RESPONSE_RECEIVED 4
 489 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 490 #define   MID_NO_RESP_NEEDED 0x10
 491
 492 /* Types of response buffer returned from SendReceive2 */
 493 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 494 #define   CIFS_SMALL_BUFFER     1
 495 #define   CIFS_LARGE_BUFFER     2
 496 #define   CIFS_IOVEC            4    /* array of response buffers */
 497
 498 /* Type of Request to SendReceive2 */
 499 #define   CIFS_STD_OP           0    /* normal request timeout */
 500 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 501 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 502 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 503 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 504 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 505 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 506 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 507 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 508
 509 /* Security Flags: indicate type of session setup needed */
 510 #define   CIFSSEC_MAY_SIGN      0x00001
 511 #define   CIFSSEC_MAY_NTLM      0x00002
 512 #define   CIFSSEC_MAY_NTLMV2    0x00004
 513 #define   CIFSSEC_MAY_KRB5      0x00008
 514 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 515 #define   CIFSSEC_MAY_LANMAN    0x00010
 516 #define   CIFSSEC_MAY_PLNTXT    0x00020
 517 #else
 518 #define   CIFSSEC_MAY_LANMAN    0
 519 #define   CIFSSEC_MAY_PLNTXT    0
 520 #endif /* weak passwords */
 521 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 522
 523 #define   CIFSSEC_MUST_SIGN     0x01001
 524 /* note that only one of the following can be set so the
 525 result of setting MUST flags more than once will be to
 526 require use of the stronger protocol */
 527 #define   CIFSSEC_MUST_NTLM     0x02002
 528 #define   CIFSSEC_MUST_NTLMV2   0x04004
 529 #define   CIFSSEC_MUST_KRB5     0x08008
 530 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 531 #define   CIFSSEC_MUST_LANMAN   0x10010
 532 #define   CIFSSEC_MUST_PLNTXT   0x20020
 533 #ifdef CONFIG_CIFS_UPCALL
 534 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 535 #else
 536 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 537 #endif /* UPCALL */
 538 #else /* do not allow weak pw hash */
 539 #ifdef CONFIG_CIFS_UPCALL
 540 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 541 #else
 542 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 543 #endif /* UPCALL */
 544 #endif /* WEAK_PW_HASH */
 545 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 546
 547 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 548 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 549 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 550 /*
 551  *****************************************************************
 552  * All constants go here
 553  *****************************************************************
 554  */
 555
 556 #define UID_HASH (16)
 557
 558 /*
 559  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 560  * following to be declared.
 561  */
 562
 563 /****************************************************************************
 564  *  Locking notes.  All updates to global variables and lists should be
 565  *                  protected by spinlocks or semaphores.
 566  *
 567  *  Spinlocks
 568  *  ---------
 569  *  GlobalMid_Lock protects:
 570  *      list operations on pending_mid_q and oplockQ
 571  *      updates to XID counters, multiplex id  and SMB sequence numbers
 572  *  GlobalSMBSesLock protects:
 573  *      list operations on tcp and SMB session lists and tCon lists
 574  *  f_owner.lock protects certain per file struct operations
 575  *  mapping->page_lock protects certain per page operations
 576  *
 577  *  Semaphores
 578  *  ----------
 579  *  sesSem     operations on smb session
 580  *  tconSem    operations on tree connection
 581  *  fh_sem      file handle reconnection operations
 582  *
 583  ****************************************************************************/
 584
 585 #ifdef DECLARE_GLOBALS_HERE
 586 #define GLOBAL_EXTERN
 587 #else
 588 #define GLOBAL_EXTERN extern
 589 #endif
 590
 591 /*
 592  * the list of TCP_Server_Info structures, ie each of the sockets
 593  * connecting our client to a distinct server (ip address), is
 594  * chained together by cifs_tcp_ses_list. The list of all our SMB
 595  * sessions (and from that the tree connections) can be found
 596  * by iterating over cifs_tcp_ses_list
 597  */
 598 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 599
 600 /*
 601  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 602  * tcp session, and the list of tcon's per smb session. It also protects
 603  * the reference counters for the server, smb session, and tcon. Finally,
 604  * changes to the tcon->tidStatus should be done while holding this lock.
 605  */
 606 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 607 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 608
 609 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 610
 611 /* Outstanding dir notify requests */
 612 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 613 /* DirNotify response queue */
 614 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 615
 616 /*
 617  * Global transaction id (XID) information
 618  */
 619 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 620 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 621 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 622 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 623                                           /* on midQ entries */
 624 GLOBAL_EXTERN char Local_System_Name[15];
 625
 626 /*
 627  *  Global counters, updated atomically
 628  */
 629 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 630 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 631 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 632 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 633 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 634
 635 /* Various Debug counters */
 636 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 637 #ifdef CONFIG_CIFS_STATS2
 638 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 639 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 640 #endif
 641 GLOBAL_EXTERN atomic_t smBufAllocCount;
 642 GLOBAL_EXTERN atomic_t midCount;
 643
 644 /* Misc globals */
 645 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 646                                 to be established on existing mount if we
 647                                 have the uid/password or Kerberos credential
 648                                 or equivalent for current user */
 649 GLOBAL_EXTERN unsigned int oplockEnabled;
 650 GLOBAL_EXTERN unsigned int experimEnabled;
 651 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 652 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 653                                 with more secure ntlmssp2 challenge/resp */
 654 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 655 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 656 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 657 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 658 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 659 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 660