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         struct list_head tcp_ses_list;
 126         struct list_head smb_ses_list;
 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 socketUseCount; /* number of open cifs sessions on socket */
 149         atomic_t inFlight;  /* number of requests on the wire to server */
 150 #ifdef CONFIG_CIFS_STATS2
 151         atomic_t inSend; /* requests trying to send */
 152         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 153 #endif
 154         enum statusEnum tcpStatus; /* what we think the status is */
 155         struct semaphore tcpSem;
 156         struct task_struct *tsk;
 157         char server_GUID[16];
 158         char secMode;
 159         enum securityEnum secType;
 160         unsigned int maxReq;    /* Clients should submit no more */
 161         /* than maxReq distinct unanswered SMBs to the server when using  */
 162         /* multiplexed reads or writes */
 163         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 164         /* message size the server can send or receive for non-raw SMBs */
 165         unsigned int maxRw;     /* maxRw specifies the maximum */
 166         /* message size the server can send or receive for */
 167         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 168         char sessid[4];         /* unique token id for this session */
 169         /* (returned on Negotiate */
 170         int capabilities; /* allow selective disabling of caps by smb sess */
 171         int timeAdj;  /* Adjust for difference in server time zone in sec */
 172         __u16 CurrentMid;         /* multiplex id - rotating counter */
 173         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 174         /* 16th byte of RFC1001 workstation name is always null */
 175         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 176         __u32 sequence_number; /* needed for CIFS PDU signature */
 177         struct mac_key mac_signing_key;
 178         char ntlmv2_hash[16];
 179         unsigned long lstrp; /* when we got last response from this server */
 180 };
 181
 182 /*
 183  * The following is our shortcut to user information.  We surface the uid,
 184  * and name. We always get the password on the fly in case it
 185  * has changed. We also hang a list of sessions owned by this user off here.
 186  */
 187 struct cifsUidInfo {
 188         struct list_head userList;
 189         struct list_head sessionList; /* SMB sessions for this user */
 190         uid_t linux_uid;
 191         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 192         /* BB may need ptr or callback for PAM or WinBind info */
 193 };
 194
 195 /*
 196  * Session structure.  One of these for each uid session with a particular host
 197  */
 198 struct cifsSesInfo {
 199         struct list_head cifsSessionList;
 200         struct list_head tcon_list;
 201         struct semaphore sesSem;
 202 #if 0
 203         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 204 #endif
 205         struct TCP_Server_Info *server; /* pointer to server info */
 206         atomic_t inUse; /* # of mounts (tree connections) on this ses */
 207         enum statusEnum status;
 208         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 209         __u16 ipc_tid;          /* special tid for connection to IPC share */
 210         __u16 flags;
 211         char *serverOS;         /* name of operating system underlying server */
 212         char *serverNOS;        /* name of network operating system of server */
 213         char *serverDomain;     /* security realm of server */
 214         int Suid;               /* remote smb uid  */
 215         uid_t linux_uid;        /* local Linux uid */
 216         int capabilities;
 217         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 218                                 TCP names - will ipv6 and sctp addresses fit? */
 219         char userName[MAX_USERNAME_SIZE + 1];
 220         char *domainName;
 221         char *password;
 222         bool need_reconnect:1; /* connection reset, uid now invalid */
 223 };
 224 /* no more than one of the following three session flags may be set */
 225 #define CIFS_SES_NT4 1
 226 #define CIFS_SES_OS2 2
 227 #define CIFS_SES_W9X 4
 228 /* following flag is set for old servers such as OS2 (and Win95?)
 229    which do not negotiate NTLM or POSIX dialects, but instead
 230    negotiate one of the older LANMAN dialects */
 231 #define CIFS_SES_LANMAN 8
 232 /*
 233  * there is one of these for each connection to a resource on a particular
 234  * session
 235  */
 236 struct cifsTconInfo {
 237         struct list_head cifsConnectionList;
 238         struct list_head openFileList;
 239         struct semaphore tconSem;
 240         struct cifsSesInfo *ses;        /* pointer to session associated with */
 241         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 242         char *nativeFileSystem;
 243         __u16 tid;              /* The 2 byte tree id */
 244         __u16 Flags;            /* optional support bits */
 245         enum statusEnum tidStatus;
 246         atomic_t useCount;      /* how many explicit/implicit mounts to share */
 247 #ifdef CONFIG_CIFS_STATS
 248         atomic_t num_smbs_sent;
 249         atomic_t num_writes;
 250         atomic_t num_reads;
 251         atomic_t num_oplock_brks;
 252         atomic_t num_opens;
 253         atomic_t num_closes;
 254         atomic_t num_deletes;
 255         atomic_t num_mkdirs;
 256         atomic_t num_rmdirs;
 257         atomic_t num_renames;
 258         atomic_t num_t2renames;
 259         atomic_t num_ffirst;
 260         atomic_t num_fnext;
 261         atomic_t num_fclose;
 262         atomic_t num_hardlinks;
 263         atomic_t num_symlinks;
 264         atomic_t num_locks;
 265         atomic_t num_acl_get;
 266         atomic_t num_acl_set;
 267 #ifdef CONFIG_CIFS_STATS2
 268         unsigned long long time_writes;
 269         unsigned long long time_reads;
 270         unsigned long long time_opens;
 271         unsigned long long time_deletes;
 272         unsigned long long time_closes;
 273         unsigned long long time_mkdirs;
 274         unsigned long long time_rmdirs;
 275         unsigned long long time_renames;
 276         unsigned long long time_t2renames;
 277         unsigned long long time_ffirst;
 278         unsigned long long time_fnext;
 279         unsigned long long time_fclose;
 280 #endif /* CONFIG_CIFS_STATS2 */
 281         __u64    bytes_read;
 282         __u64    bytes_written;
 283         spinlock_t stat_lock;
 284 #endif /* CONFIG_CIFS_STATS */
 285         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 286         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 287         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 288         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 289         bool retry:1;
 290         bool nocase:1;
 291         bool seal:1;      /* transport encryption for this mounted share */
 292         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 293                                 for this mount even if server would support */
 294         bool local_lease:1; /* check leases (only) on local system not remote */
 295         bool need_reconnect:1; /* connection reset, tid now invalid */
 296         /* BB add field for back pointer to sb struct(s)? */
 297 };
 298
 299 /*
 300  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 301  * This is used to track byte stream locks on the file
 302  */
 303 struct cifsLockInfo {
 304         struct list_head llist; /* pointer to next cifsLockInfo */
 305         __u64 offset;
 306         __u64 length;
 307         __u8 type;
 308 };
 309
 310 /*
 311  * One of these for each open instance of a file
 312  */
 313 struct cifs_search_info {
 314         loff_t index_of_last_entry;
 315         __u16 entries_in_buffer;
 316         __u16 info_level;
 317         __u32 resume_key;
 318         char *ntwrk_buf_start;
 319         char *srch_entries_start;
 320         char *last_entry;
 321         char *presume_name;
 322         unsigned int resume_name_len;
 323         bool endOfSearch:1;
 324         bool emptyDir:1;
 325         bool unicode:1;
 326         bool smallBuf:1; /* so we know which buf_release function to call */
 327 };
 328
 329 struct cifsFileInfo {
 330         struct list_head tlist; /* pointer to next fid owned by tcon */
 331         struct list_head flist; /* next fid (file instance) for this inode */
 332         unsigned int uid;       /* allows finding which FileInfo structure */
 333         __u32 pid;              /* process id who opened file */
 334         __u16 netfid;           /* file id from remote */
 335         /* BB add lock scope info here if needed */ ;
 336         /* lock scope id (0 if none) */
 337         struct file *pfile; /* needed for writepage */
 338         struct inode *pInode; /* needed for oplock break */
 339         struct mutex lock_mutex;
 340         struct list_head llist; /* list of byte range locks we have. */
 341         bool closePend:1;       /* file is marked to close */
 342         bool invalidHandle:1;   /* file closed via session abend */
 343         bool messageMode:1;     /* for pipes: message vs byte mode */
 344         atomic_t wrtPending;   /* handle in use - defer close */
 345         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 346         struct cifs_search_info srch_inf;
 347 };
 348
 349 /*
 350  * One of these for each file inode
 351  */
 352
 353 struct cifsInodeInfo {
 354         struct list_head lockList;
 355         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 356         struct list_head openFileList;
 357         int write_behind_rc;
 358         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 359         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 360         unsigned long time;     /* jiffies of last update/check of inode */
 361         bool clientCanCacheRead:1;      /* read oplock */
 362         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 363         bool oplockPending:1;
 364         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 365         struct inode vfs_inode;
 366 };
 367
 368 static inline struct cifsInodeInfo *
 369 CIFS_I(struct inode *inode)
 370 {
 371         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 372 }
 373
 374 static inline struct cifs_sb_info *
 375 CIFS_SB(struct super_block *sb)
 376 {
 377         return sb->s_fs_info;
 378 }
 379
 380 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 381 {
 382         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 383                 return '/';
 384         else
 385                 return '\\';
 386 }
 387
 388 #ifdef CONFIG_CIFS_STATS
 389 #define cifs_stats_inc atomic_inc
 390
 391 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 392                                             unsigned int bytes)
 393 {
 394         if (bytes) {
 395                 spin_lock(&tcon->stat_lock);
 396                 tcon->bytes_written += bytes;
 397                 spin_unlock(&tcon->stat_lock);
 398         }
 399 }
 400
 401 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 402                                          unsigned int bytes)
 403 {
 404         spin_lock(&tcon->stat_lock);
 405         tcon->bytes_read += bytes;
 406         spin_unlock(&tcon->stat_lock);
 407 }
 408 #else
 409
 410 #define  cifs_stats_inc(field) do {} while (0)
 411 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 412 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 413
 414 #endif
 415
 416 /* one of these for every pending CIFS request to the server */
 417 struct mid_q_entry {
 418         struct list_head qhead; /* mids waiting on reply from this server */
 419         __u16 mid;              /* multiplex id */
 420         __u16 pid;              /* process id */
 421         __u32 sequence_number;  /* for CIFS signing */
 422         unsigned long when_alloc;  /* when mid was created */
 423 #ifdef CONFIG_CIFS_STATS2
 424         unsigned long when_sent; /* time when smb send finished */
 425         unsigned long when_received; /* when demux complete (taken off wire) */
 426 #endif
 427         struct cifsSesInfo *ses;        /* smb was sent to this server */
 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 servers that did not respond with NT LM 0.12.
 597  * This list helps improve performance and eliminate the messages indicating
 598  * that we had a communications error talking to the server in this list.
 599  */
 600 /* Feature not supported */
 601 /* GLOBAL_EXTERN struct servers_not_supported *NotSuppList; */
 602
 603 /*
 604  * The following is a hash table of all the users we know about.
 605  */
 606 GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
 607
 608 /* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
 609 GLOBAL_EXTERN struct list_head GlobalSMBSessionList;
 610 GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
 611 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;  /* protects list inserts on 3 above */
 612
 613 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 614
 615 /* Outstanding dir notify requests */
 616 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 617 /* DirNotify response queue */
 618 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 619
 620 /*
 621  * Global transaction id (XID) information
 622  */
 623 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 624 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 625 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 626 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 627                                           /* on midQ entries */
 628 GLOBAL_EXTERN char Local_System_Name[15];
 629
 630 /*
 631  *  Global counters, updated atomically
 632  */
 633 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 634 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 635 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 636 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 637 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 638
 639 /* Various Debug counters */
 640 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 641 #ifdef CONFIG_CIFS_STATS2
 642 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 643 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 644 #endif
 645 GLOBAL_EXTERN atomic_t smBufAllocCount;
 646 GLOBAL_EXTERN atomic_t midCount;
 647
 648 /* Misc globals */
 649 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 650                                 to be established on existing mount if we
 651                                 have the uid/password or Kerberos credential
 652                                 or equivalent for current user */
 653 GLOBAL_EXTERN unsigned int oplockEnabled;
 654 GLOBAL_EXTERN unsigned int experimEnabled;
 655 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 656 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 657                                 with more secure ntlmssp2 challenge/resp */
 658 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 659 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 660 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 661 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 662 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 663 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 664