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 max_rw;    /* 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         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 171                                    those that can be specified uniquely with
 172                                    vcnumbers */
 173         char sessid[4];         /* unique token id for this session */
 174         /* (returned on Negotiate */
 175         int capabilities; /* allow selective disabling of caps by smb sess */
 176         int timeAdj;  /* Adjust for difference in server time zone in sec */
 177         __u16 CurrentMid;         /* multiplex id - rotating counter */
 178         char cryptKey[CIFS_CRYPTO_KEY_SIZE];
 179         /* 16th byte of RFC1001 workstation name is always null */
 180         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 181         __u32 sequence_number; /* needed for CIFS PDU signature */
 182         struct mac_key mac_signing_key;
 183         char ntlmv2_hash[16];
 184         unsigned long lstrp; /* when we got last response from this server */
 185 };
 186
 187 /*
 188  * The following is our shortcut to user information.  We surface the uid,
 189  * and name. We always get the password on the fly in case it
 190  * has changed. We also hang a list of sessions owned by this user off here.
 191  */
 192 struct cifsUidInfo {
 193         struct list_head userList;
 194         struct list_head sessionList; /* SMB sessions for this user */
 195         uid_t linux_uid;
 196         char user[MAX_USERNAME_SIZE + 1];       /* ascii name of user */
 197         /* BB may need ptr or callback for PAM or WinBind info */
 198 };
 199
 200 /*
 201  * Session structure.  One of these for each uid session with a particular host
 202  */
 203 struct cifsSesInfo {
 204         struct list_head smb_ses_list;
 205         struct list_head tcon_list;
 206         struct semaphore sesSem;
 207 #if 0
 208         struct cifsUidInfo *uidInfo;    /* pointer to user info */
 209 #endif
 210         struct TCP_Server_Info *server; /* pointer to server info */
 211         int ses_count;          /* reference counter */
 212         enum statusEnum status;
 213         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 214         __u16 ipc_tid;          /* special tid for connection to IPC share */
 215         __u16 flags;
 216         __u16 vcnum;
 217         char *serverOS;         /* name of operating system underlying server */
 218         char *serverNOS;        /* name of network operating system of server */
 219         char *serverDomain;     /* security realm of server */
 220         int Suid;               /* remote smb uid  */
 221         uid_t linux_uid;        /* local Linux uid */
 222         int capabilities;
 223         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 224                                 TCP names - will ipv6 and sctp addresses fit? */
 225         char userName[MAX_USERNAME_SIZE + 1];
 226         char *domainName;
 227         char *password;
 228         bool need_reconnect:1; /* connection reset, uid now invalid */
 229 };
 230 /* no more than one of the following three session flags may be set */
 231 #define CIFS_SES_NT4 1
 232 #define CIFS_SES_OS2 2
 233 #define CIFS_SES_W9X 4
 234 /* following flag is set for old servers such as OS2 (and Win95?)
 235    which do not negotiate NTLM or POSIX dialects, but instead
 236    negotiate one of the older LANMAN dialects */
 237 #define CIFS_SES_LANMAN 8
 238 /*
 239  * there is one of these for each connection to a resource on a particular
 240  * session
 241  */
 242 struct cifsTconInfo {
 243         struct list_head tcon_list;
 244         int tc_count;
 245         struct list_head openFileList;
 246         struct cifsSesInfo *ses;        /* pointer to session associated with */
 247         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 248         char *nativeFileSystem;
 249         char *password;         /* for share-level security */
 250         __u16 tid;              /* The 2 byte tree id */
 251         __u16 Flags;            /* optional support bits */
 252         enum statusEnum tidStatus;
 253 #ifdef CONFIG_CIFS_STATS
 254         atomic_t num_smbs_sent;
 255         atomic_t num_writes;
 256         atomic_t num_reads;
 257         atomic_t num_oplock_brks;
 258         atomic_t num_opens;
 259         atomic_t num_closes;
 260         atomic_t num_deletes;
 261         atomic_t num_mkdirs;
 262         atomic_t num_rmdirs;
 263         atomic_t num_renames;
 264         atomic_t num_t2renames;
 265         atomic_t num_ffirst;
 266         atomic_t num_fnext;
 267         atomic_t num_fclose;
 268         atomic_t num_hardlinks;
 269         atomic_t num_symlinks;
 270         atomic_t num_locks;
 271         atomic_t num_acl_get;
 272         atomic_t num_acl_set;
 273 #ifdef CONFIG_CIFS_STATS2
 274         unsigned long long time_writes;
 275         unsigned long long time_reads;
 276         unsigned long long time_opens;
 277         unsigned long long time_deletes;
 278         unsigned long long time_closes;
 279         unsigned long long time_mkdirs;
 280         unsigned long long time_rmdirs;
 281         unsigned long long time_renames;
 282         unsigned long long time_t2renames;
 283         unsigned long long time_ffirst;
 284         unsigned long long time_fnext;
 285         unsigned long long time_fclose;
 286 #endif /* CONFIG_CIFS_STATS2 */
 287         __u64    bytes_read;
 288         __u64    bytes_written;
 289         spinlock_t stat_lock;
 290 #endif /* CONFIG_CIFS_STATS */
 291         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 292         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 293         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 294         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 295         bool retry:1;
 296         bool nocase:1;
 297         bool seal:1;      /* transport encryption for this mounted share */
 298         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 299                                 for this mount even if server would support */
 300         bool local_lease:1; /* check leases (only) on local system not remote */
 301         bool need_reconnect:1; /* connection reset, tid now invalid */
 302         /* BB add field for back pointer to sb struct(s)? */
 303 };
 304
 305 /*
 306  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 307  * This is used to track byte stream locks on the file
 308  */
 309 struct cifsLockInfo {
 310         struct list_head llist; /* pointer to next cifsLockInfo */
 311         __u64 offset;
 312         __u64 length;
 313         __u8 type;
 314 };
 315
 316 /*
 317  * One of these for each open instance of a file
 318  */
 319 struct cifs_search_info {
 320         loff_t index_of_last_entry;
 321         __u16 entries_in_buffer;
 322         __u16 info_level;
 323         __u32 resume_key;
 324         char *ntwrk_buf_start;
 325         char *srch_entries_start;
 326         char *last_entry;
 327         char *presume_name;
 328         unsigned int resume_name_len;
 329         bool endOfSearch:1;
 330         bool emptyDir:1;
 331         bool unicode:1;
 332         bool smallBuf:1; /* so we know which buf_release function to call */
 333 };
 334
 335 struct cifsFileInfo {
 336         struct list_head tlist; /* pointer to next fid owned by tcon */
 337         struct list_head flist; /* next fid (file instance) for this inode */
 338         unsigned int uid;       /* allows finding which FileInfo structure */
 339         __u32 pid;              /* process id who opened file */
 340         __u16 netfid;           /* file id from remote */
 341         /* BB add lock scope info here if needed */ ;
 342         /* lock scope id (0 if none) */
 343         struct file *pfile; /* needed for writepage */
 344         struct inode *pInode; /* needed for oplock break */
 345         struct mutex lock_mutex;
 346         struct list_head llist; /* list of byte range locks we have. */
 347         bool closePend:1;       /* file is marked to close */
 348         bool invalidHandle:1;   /* file closed via session abend */
 349         bool messageMode:1;     /* for pipes: message vs byte mode */
 350         atomic_t wrtPending;   /* handle in use - defer close */
 351         struct semaphore fh_sem; /* prevents reopen race after dead ses*/
 352         struct cifs_search_info srch_inf;
 353 };
 354
 355 /*
 356  * One of these for each file inode
 357  */
 358
 359 struct cifsInodeInfo {
 360         struct list_head lockList;
 361         /* BB add in lists for dirty pages i.e. write caching info for oplock */
 362         struct list_head openFileList;
 363         int write_behind_rc;
 364         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 365         atomic_t inUse;  /* num concurrent users (local openers cifs) of file*/
 366         unsigned long time;     /* jiffies of last update/check of inode */
 367         bool clientCanCacheRead:1;      /* read oplock */
 368         bool clientCanCacheAll:1;       /* read and writebehind oplock */
 369         bool oplockPending:1;
 370         bool delete_pending:1;          /* DELETE_ON_CLOSE is set */
 371         struct inode vfs_inode;
 372 };
 373
 374 static inline struct cifsInodeInfo *
 375 CIFS_I(struct inode *inode)
 376 {
 377         return container_of(inode, struct cifsInodeInfo, vfs_inode);
 378 }
 379
 380 static inline struct cifs_sb_info *
 381 CIFS_SB(struct super_block *sb)
 382 {
 383         return sb->s_fs_info;
 384 }
 385
 386 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 387 {
 388         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 389                 return '/';
 390         else
 391                 return '\\';
 392 }
 393
 394 #ifdef CONFIG_CIFS_STATS
 395 #define cifs_stats_inc atomic_inc
 396
 397 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
 398                                             unsigned int bytes)
 399 {
 400         if (bytes) {
 401                 spin_lock(&tcon->stat_lock);
 402                 tcon->bytes_written += bytes;
 403                 spin_unlock(&tcon->stat_lock);
 404         }
 405 }
 406
 407 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
 408                                          unsigned int bytes)
 409 {
 410         spin_lock(&tcon->stat_lock);
 411         tcon->bytes_read += bytes;
 412         spin_unlock(&tcon->stat_lock);
 413 }
 414 #else
 415
 416 #define  cifs_stats_inc(field) do {} while (0)
 417 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 418 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 419
 420 #endif
 421
 422 /* one of these for every pending CIFS request to the server */
 423 struct mid_q_entry {
 424         struct list_head qhead; /* mids waiting on reply from this server */
 425         __u16 mid;              /* multiplex id */
 426         __u16 pid;              /* process id */
 427         __u32 sequence_number;  /* for CIFS signing */
 428         unsigned long when_alloc;  /* when mid was created */
 429 #ifdef CONFIG_CIFS_STATS2
 430         unsigned long when_sent; /* time when smb send finished */
 431         unsigned long when_received; /* when demux complete (taken off wire) */
 432 #endif
 433         struct task_struct *tsk;        /* task waiting for response */
 434         struct smb_hdr *resp_buf;       /* response buffer */
 435         int midState;   /* wish this were enum but can not pass to wait_event */
 436         __u8 command;   /* smb command code */
 437         bool largeBuf:1;        /* if valid response, is pointer to large buf */
 438         bool multiRsp:1;        /* multiple trans2 responses for one request  */
 439         bool multiEnd:1;        /* both received */
 440 };
 441
 442 struct oplock_q_entry {
 443         struct list_head qhead;
 444         struct inode *pinode;
 445         struct cifsTconInfo *tcon;
 446         __u16 netfid;
 447 };
 448
 449 /* for pending dnotify requests */
 450 struct dir_notify_req {
 451        struct list_head lhead;
 452        __le16 Pid;
 453        __le16 PidHigh;
 454        __u16 Mid;
 455        __u16 Tid;
 456        __u16 Uid;
 457        __u16 netfid;
 458        __u32 filter; /* CompletionFilter (for multishot) */
 459        int multishot;
 460        struct file *pfile;
 461 };
 462
 463 struct dfs_info3_param {
 464         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
 465         int path_consumed;
 466         int server_type;
 467         int ref_flag;
 468         char *path_name;
 469         char *node_name;
 470 };
 471
 472 static inline void free_dfs_info_param(struct dfs_info3_param *param)
 473 {
 474         if (param) {
 475                 kfree(param->path_name);
 476                 kfree(param->node_name);
 477                 kfree(param);
 478         }
 479 }
 480
 481 static inline void free_dfs_info_array(struct dfs_info3_param *param,
 482                                        int number_of_items)
 483 {
 484         int i;
 485         if ((number_of_items == 0) || (param == NULL))
 486                 return;
 487         for (i = 0; i < number_of_items; i++) {
 488                 kfree(param[i].path_name);
 489                 kfree(param[i].node_name);
 490         }
 491         kfree(param);
 492 }
 493
 494 #define   MID_FREE 0
 495 #define   MID_REQUEST_ALLOCATED 1
 496 #define   MID_REQUEST_SUBMITTED 2
 497 #define   MID_RESPONSE_RECEIVED 4
 498 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
 499 #define   MID_NO_RESP_NEEDED 0x10
 500
 501 /* Types of response buffer returned from SendReceive2 */
 502 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
 503 #define   CIFS_SMALL_BUFFER     1
 504 #define   CIFS_LARGE_BUFFER     2
 505 #define   CIFS_IOVEC            4    /* array of response buffers */
 506
 507 /* Type of Request to SendReceive2 */
 508 #define   CIFS_STD_OP           0    /* normal request timeout */
 509 #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
 510 #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
 511 #define   CIFS_BLOCKING_OP      4    /* operation can block */
 512 #define   CIFS_ASYNC_OP         8    /* do not wait for response */
 513 #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
 514 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
 515 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
 516 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
 517
 518 /* Security Flags: indicate type of session setup needed */
 519 #define   CIFSSEC_MAY_SIGN      0x00001
 520 #define   CIFSSEC_MAY_NTLM      0x00002
 521 #define   CIFSSEC_MAY_NTLMV2    0x00004
 522 #define   CIFSSEC_MAY_KRB5      0x00008
 523 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 524 #define   CIFSSEC_MAY_LANMAN    0x00010
 525 #define   CIFSSEC_MAY_PLNTXT    0x00020
 526 #else
 527 #define   CIFSSEC_MAY_LANMAN    0
 528 #define   CIFSSEC_MAY_PLNTXT    0
 529 #endif /* weak passwords */
 530 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
 531
 532 #define   CIFSSEC_MUST_SIGN     0x01001
 533 /* note that only one of the following can be set so the
 534 result of setting MUST flags more than once will be to
 535 require use of the stronger protocol */
 536 #define   CIFSSEC_MUST_NTLM     0x02002
 537 #define   CIFSSEC_MUST_NTLMV2   0x04004
 538 #define   CIFSSEC_MUST_KRB5     0x08008
 539 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 540 #define   CIFSSEC_MUST_LANMAN   0x10010
 541 #define   CIFSSEC_MUST_PLNTXT   0x20020
 542 #ifdef CONFIG_CIFS_UPCALL
 543 #define   CIFSSEC_MASK          0x3F03F /* allows weak security but also krb5 */
 544 #else
 545 #define   CIFSSEC_MASK          0x37037 /* current flags supported if weak */
 546 #endif /* UPCALL */
 547 #else /* do not allow weak pw hash */
 548 #ifdef CONFIG_CIFS_UPCALL
 549 #define   CIFSSEC_MASK          0x0F00F /* flags supported if no weak allowed */
 550 #else
 551 #define   CIFSSEC_MASK          0x07007 /* flags supported if no weak allowed */
 552 #endif /* UPCALL */
 553 #endif /* WEAK_PW_HASH */
 554 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
 555
 556 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
 557 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
 558 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5)
 559 /*
 560  *****************************************************************
 561  * All constants go here
 562  *****************************************************************
 563  */
 564
 565 #define UID_HASH (16)
 566
 567 /*
 568  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
 569  * following to be declared.
 570  */
 571
 572 /****************************************************************************
 573  *  Locking notes.  All updates to global variables and lists should be
 574  *                  protected by spinlocks or semaphores.
 575  *
 576  *  Spinlocks
 577  *  ---------
 578  *  GlobalMid_Lock protects:
 579  *      list operations on pending_mid_q and oplockQ
 580  *      updates to XID counters, multiplex id  and SMB sequence numbers
 581  *  GlobalSMBSesLock protects:
 582  *      list operations on tcp and SMB session lists and tCon lists
 583  *  f_owner.lock protects certain per file struct operations
 584  *  mapping->page_lock protects certain per page operations
 585  *
 586  *  Semaphores
 587  *  ----------
 588  *  sesSem     operations on smb session
 589  *  tconSem    operations on tree connection
 590  *  fh_sem      file handle reconnection operations
 591  *
 592  ****************************************************************************/
 593
 594 #ifdef DECLARE_GLOBALS_HERE
 595 #define GLOBAL_EXTERN
 596 #else
 597 #define GLOBAL_EXTERN extern
 598 #endif
 599
 600 /*
 601  * the list of TCP_Server_Info structures, ie each of the sockets
 602  * connecting our client to a distinct server (ip address), is
 603  * chained together by cifs_tcp_ses_list. The list of all our SMB
 604  * sessions (and from that the tree connections) can be found
 605  * by iterating over cifs_tcp_ses_list
 606  */
 607 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
 608
 609 /*
 610  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
 611  * tcp session, and the list of tcon's per smb session. It also protects
 612  * the reference counters for the server, smb session, and tcon. Finally,
 613  * changes to the tcon->tidStatus should be done while holding this lock.
 614  */
 615 GLOBAL_EXTERN rwlock_t          cifs_tcp_ses_lock;
 616
 617 /*
 618  * This lock protects the cifs_file->llist and cifs_file->flist
 619  * list operations, and updates to some flags (cifs_file->invalidHandle)
 620  * It will be moved to either use the tcon->stat_lock or equivalent later.
 621  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
 622  * the cifs_tcp_ses_lock must be grabbed first and released last.
 623  */
 624 GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;
 625
 626 GLOBAL_EXTERN struct list_head GlobalOplock_Q;
 627
 628 /* Outstanding dir notify requests */
 629 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
 630 /* DirNotify response queue */
 631 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
 632
 633 /*
 634  * Global transaction id (XID) information
 635  */
 636 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
 637 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
 638 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
 639 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
 640                                           /* on midQ entries */
 641 GLOBAL_EXTERN char Local_System_Name[15];
 642
 643 /*
 644  *  Global counters, updated atomically
 645  */
 646 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
 647 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
 648 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
 649 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
 650 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
 651
 652 /* Various Debug counters */
 653 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
 654 #ifdef CONFIG_CIFS_STATS2
 655 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
 656 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
 657 #endif
 658 GLOBAL_EXTERN atomic_t smBufAllocCount;
 659 GLOBAL_EXTERN atomic_t midCount;
 660
 661 /* Misc globals */
 662 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
 663                                 to be established on existing mount if we
 664                                 have the uid/password or Kerberos credential
 665                                 or equivalent for current user */
 666 GLOBAL_EXTERN unsigned int oplockEnabled;
 667 GLOBAL_EXTERN unsigned int experimEnabled;
 668 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
 669 GLOBAL_EXTERN unsigned int extended_security;   /* if on, session setup sent
 670                                 with more secure ntlmssp2 challenge/resp */
 671 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
 672 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
 673 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 674 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 675 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
 676 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
 677