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         char *password;         /* for share-level security */
 246         __u16 tid;              /* The 2 byte tree id */
 247         __u16 Flags;            /* optional support bits */
 248         enum statusEnum tidStatus;
 249 #ifdef CONFIG_CIFS_STATS
 250         atomic_t num_smbs_sent;
 251         atomic_t num_writes;
 252         atomic_t num_reads;
 253         atomic_t num_oplock_brks;
 254         atomic_t num_opens;
 255         atomic_t num_closes;
 256         atomic_t num_deletes;
 257         atomic_t num_mkdirs;
 258         atomic_t num_rmdirs;
 259         atomic_t num_renames;
 260         atomic_t num_t2renames;
 261         atomic_t num_ffirst;
 262         atomic_t num_fnext;
 263         atomic_t num_fclose;
 264         atomic_t num_hardlinks;
 265         atomic_t num_symlinks;
 266         atomic_t num_locks;
 267         atomic_t num_acl_get;
 268         atomic_t num_acl_set;
 269 #ifdef CONFIG_CIFS_STATS2
 270         unsigned long long time_writes;
 271         unsigned long long time_reads;
 272         unsigned long long time_opens;
 273         unsigned long long time_deletes;
 274         unsigned long long time_closes;
 275         unsigned long long time_mkdirs;
 276         unsigned long long time_rmdirs;
 277         unsigned long long time_renames;
 278         unsigned long long time_t2renames;
 279         unsigned long long time_ffirst;
 280         unsigned long long time_fnext;
 281         unsigned long long time_fclose;
 282 #endif /* CONFIG_CIFS_STATS2 */
 283         __u64    bytes_read;
 284         __u64    bytes_written;
 285         spinlock_t stat_lock;
 286 #endif /* CONFIG_CIFS_STATS */
 287         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 288         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 289         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 290         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 291         bool retry:1;
 292         bool nocase:1;
 293         bool seal:1;      /* transport encryption for this mounted share */
 294         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 295                                 for this mount even if server would support */
 296         bool local_lease:1; /* check leases (only) on local system not remote */
 297         bool need_reconnect:1; /* connection reset, tid now invalid */
 298         /* BB add field for back pointer to sb struct(s)? */
 299 };
 300
 301 /*
 302  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 303  * This is used to track byte stream locks on the file
 304  */
 305 struct cifsLockInfo {
 306         struct list_head llist; /* pointer to next cifsLockInfo */
 307         __u64 offset;
 308         __u64 length;
 309         __u8 type;
 310 };
 311
 312 /*
 313  * One of these for each open instance of a file
 314  */
 315 struct cifs_search_info {
 316         loff_t index_of_last_entry;
 317         __u16 entries_in_buffer;
 318         __u16 info_level;
 319         __u32 resume_key;
 320         char *ntwrk_buf_start;
 321         char *srch_entries_start;
 322         char *last_entry;
 323         char *presume_name;
 324         unsigned int resume_name_len;
 325         bool endOfSearch:1;
 326         bool emptyDir:1;
 327         bool unicode:1;
 328         bool smallBuf:1; /* so we know which buf_release function to call */
 329 };
 330
 331 struct cifsFileInfo {
 332         struct list_head tlist; /* pointer to next fid owned by tcon */
 333         struct list_head flist; /* next fid (file instance) for this inode */
 334         unsigned int uid;       /* allows finding which FileInfo structure */
 335         __u32 pid;              /* process id who opened file */
 336         __u16 netfid;           /* file id from remote */
 337         /* BB add lock scope info here if needed */ ;
 338         /* lock scope id (0 if none) */
 339         struct file *pfile; /* needed for writepage */
 340         struct inode *pInode; /* needed for oplock break */
 341         struct mutex lock_mutex;
 342         struct list_head llist; /* list of byte range locks we have. */
 343         bool closePend:1;       /* file is marked to close */
 344         bool invalidHandle:1;   /* file closed via session abend */
 345         bool messageMode:1;     /* for pipes: message vs byte mode */
 346         atomic_t wrtPending;   /* handle in use - defer close */
 347         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 348         struct cifs_search_info srch_inf;
 349 };
 350
 351 /*
 352  * One of these for each file inode
 353  */
 354
 355 struct cifsInodeInfo {
 356         struct list_head lockList;
 357         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 358         struct list_head openFileList;
 359         int write_behind_rc;
 360         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 361         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 362         unsigned long time;     /* jiffies of last update/check of inode */
 363         bool clientCanCacheRead:1;      /* read oplock */
 364         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 365         bool oplockPending:1;
 366         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 367         struct inode vfs_inode;
 368 };
 369
 370 static inline struct cifsInodeInfo *
 371 CIFS_I(struct inode *inode)
 372 {
 373         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 374 }
 375
 376 static inline struct cifs_sb_info *
 377 CIFS_SB(struct super_block *sb)
 378 {
 379         return sb->s_fs_info;
 380 }
 381
 382 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 383 {
 384         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 385                 return '/';
 386         else
 387                 return '\\';
 388 }
 389
 390 #ifdef CONFIG_CIFS_STATS
 391 #define cifs_stats_inc atomic_inc
 392
 393 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 394                                             unsigned int bytes)
 395 {
 396         if (bytes) {
 397                 spin_lock(&tcon->stat_lock);
 398                 tcon->bytes_written += bytes;
 399                 spin_unlock(&tcon->stat_lock);
 400         }
 401 }
 402
 403 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 404                                          unsigned int bytes)
 405 {
 406         spin_lock(&tcon->stat_lock);
 407         tcon->bytes_read += bytes;
 408         spin_unlock(&tcon->stat_lock);
 409 }
 410 #else
 411
 412 #define  cifs_stats_inc(field) do {} while (0)
 413 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 414 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 415
 416 #endif
 417
 418 /* one of these for every pending CIFS request to the server */
 419 struct mid_q_entry {
 420         struct list_head qhead; /* mids waiting on reply from this server */
 421         __u16 mid;              /* multiplex id */
 422         __u16 pid;              /* process id */
 423         __u32 sequence_number;  /* for CIFS signing */
 424         unsigned long when_alloc;  /* when mid was created */
 425 #ifdef CONFIG_CIFS_STATS2
 426         unsigned long when_sent; /* time when smb send finished */
 427         unsigned long when_received; /* when demux complete (taken off wire) */
 428 #endif
 429         struct task_struct *tsk;        /* task waiting for response */
 430         struct smb_hdr *resp_buf;       /* response buffer */
 431         int midState;   /* wish this were enum but can not pass to wait_event */
 432         __u8 command;   /* smb command code */
 433         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 434         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 435         bool multiEnd:1;        /* both received */
 436 };
 437
 438 struct oplock_q_entry {
 439         struct list_head qhead;
 440         struct inode *pinode;
 441         struct cifsTconInfo *tcon;
 442         __u16 netfid;
 443 };
 444
 445 /* for pending dnotify requests */
 446 struct dir_notify_req {
 447        struct list_head lhead;
 448        __le16 Pid;
 449        __le16 PidHigh;
 450        __u16 Mid;
 451        __u16 Tid;
 452        __u16 Uid;
 453        __u16 netfid;
 454        __u32 filter; /* CompletionFilter (for multishot) */
 455        int multishot;
 456        struct file *pfile;
 457 };
 458
 459 struct dfs_info3_param {
 460         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 461         int path_consumed;
 462         int server_type;
 463         int ref_flag;
 464         char *path_name;
 465         char *node_name;
 466 };
 467
 468 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 469 {
 470         if (param) {
 471                 kfree(param->path_name);
 472                 kfree(param->node_name);
 473                 kfree(param);
 474         }
 475 }
 476
 477 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 478                                        int number_of_items)
 479 {
 480         int i;
 481         if ((number_of_items == 0) || (param == NULL))
 482                 return;
 483         for (i = 0; i < number_of_items; i++) {
 484                 kfree(param[i].path_name);
 485                 kfree(param[i].node_name);
 486         }
 487         kfree(param);
 488 }
 489
 490 #define   MID_FREE 0
 491 #define   MID_REQUEST_ALLOCATED 1
 492 #define   MID_REQUEST_SUBMITTED 2
 493 #define   MID_RESPONSE_RECEIVED 4
 494 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 495 #define   MID_NO_RESP_NEEDED 0x10
 496
 497 /* Types of response buffer returned from SendReceive2 */
 498 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 499 #define   CIFS_SMALL_BUFFER     1
 500 #define   CIFS_LARGE_BUFFER     2
 501 #define   CIFS_IOVEC            4    /* array of response buffers */
 502
 503 /* Type of Request to SendReceive2 */
 504 #define   CIFS_STD_OP           0    /* normal request timeout */
 505 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 506 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 507 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 508 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 509 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 510 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 511 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 512 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 513
 514 /* Security Flags: indicate type of session setup needed */
 515 #define   CIFSSEC_MAY_SIGN      0x00001
 516 #define   CIFSSEC_MAY_NTLM      0x00002
 517 #define   CIFSSEC_MAY_NTLMV2    0x00004
 518 #define   CIFSSEC_MAY_KRB5      0x00008
 519 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 520 #define   CIFSSEC_MAY_LANMAN    0x00010
 521 #define   CIFSSEC_MAY_PLNTXT    0x00020
 522 #else
 523 #define   CIFSSEC_MAY_LANMAN    0
 524 #define   CIFSSEC_MAY_PLNTXT    0
 525 #endif /* weak passwords */
 526 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 527
 528 #define   CIFSSEC_MUST_SIGN     0x01001
 529 /* note that only one of the following can be set so the
 530 result of setting MUST flags more than once will be to
 531 require use of the stronger protocol */
 532 #define   CIFSSEC_MUST_NTLM     0x02002
 533 #define   CIFSSEC_MUST_NTLMV2   0x04004
 534 #define   CIFSSEC_MUST_KRB5     0x08008
 535 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 536 #define   CIFSSEC_MUST_LANMAN   0x10010
 537 #define   CIFSSEC_MUST_PLNTXT   0x20020
 538 #ifdef CONFIG_CIFS_UPCALL
 539 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 540 #else
 541 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 542 #endif /* UPCALL */
 543 #else /* do not allow weak pw hash */
 544 #ifdef CONFIG_CIFS_UPCALL
 545 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 546 #else
 547 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 548 #endif /* UPCALL */
 549 #endif /* WEAK_PW_HASH */
 550 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 551
 552 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 553 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 554 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 555 /*
 556  *****************************************************************
 557  * All constants go here
 558  *****************************************************************
 559  */
 560
 561 #define UID_HASH (16)
 562
 563 /*
 564  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 565  * following to be declared.
 566  */
 567
 568 /****************************************************************************
 569  *  Locking notes.  All updates to global variables and lists should be
 570  *                  protected by spinlocks or semaphores.
 571  *
 572  *  Spinlocks
 573  *  ---------
 574  *  GlobalMid_Lock protects:
 575  *      list operations on pending_mid_q and oplockQ
 576  *      updates to XID counters, multiplex id  and SMB sequence numbers
 577  *  GlobalSMBSesLock protects:
 578  *      list operations on tcp and SMB session lists and tCon lists
 579  *  f_owner.lock protects certain per file struct operations
 580  *  mapping->page_lock protects certain per page operations
 581  *
 582  *  Semaphores
 583  *  ----------
 584  *  sesSem     operations on smb session
 585  *  tconSem    operations on tree connection
 586  *  fh_sem      file handle reconnection operations
 587  *
 588  ****************************************************************************/
 589
 590 #ifdef DECLARE_GLOBALS_HERE
 591 #define GLOBAL_EXTERN
 592 #else
 593 #define GLOBAL_EXTERN extern
 594 #endif
 595
 596 /*
 597  * the list of TCP_Server_Info structures, ie each of the sockets
 598  * connecting our client to a distinct server (ip address), is
 599  * chained together by cifs_tcp_ses_list. The list of all our SMB
 600  * sessions (and from that the tree connections) can be found
 601  * by iterating over cifs_tcp_ses_list
 602  */
 603 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 604
 605 /*
 606  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 607  * tcp session, and the list of tcon's per smb session. It also protects
 608  * the reference counters for the server, smb session, and tcon. Finally,
 609  * changes to the tcon->tidStatus should be done while holding this lock.
 610  */
 611 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 612
 613 /*
 614  * This lock protects the cifs_file->llist and cifs_file->flist
 615  * list operations, and updates to some flags (cifs_file->invalidHandle)
 616  * It will be moved to either use the tcon->stat_lock or equivalent later.
 617  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 618  * the cifs_tcp_ses_lock must be grabbed first and released last.
 619  */
 620 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 621
 622 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 623
 624 /* Outstanding dir notify requests */
 625 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 626 /* DirNotify response queue */
 627 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 628
 629 /*
 630  * Global transaction id (XID) information
 631  */
 632 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 633 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 634 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 635 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 636                                           /* on midQ entries */
 637 GLOBAL_EXTERN char Local_System_Name[15];
 638
 639 /*
 640  *  Global counters, updated atomically
 641  */
 642 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 643 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 644 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 645 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 646 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 647
 648 /* Various Debug counters */
 649 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 650 #ifdef CONFIG_CIFS_STATS2
 651 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 652 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 653 #endif
 654 GLOBAL_EXTERN atomic_t smBufAllocCount;
 655 GLOBAL_EXTERN atomic_t midCount;
 656
 657 /* Misc globals */
 658 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 659                                 to be established on existing mount if we
 660                                 have the uid/password or Kerberos credential
 661                                 or equivalent for current user */
 662 GLOBAL_EXTERN unsigned int oplockEnabled;
 663 GLOBAL_EXTERN unsigned int experimEnabled;
 664 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 665 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 666                                 with more secure ntlmssp2 challenge/resp */
 667 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 668 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 669 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 670 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 671 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 672 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 673