linux/fs/cifs/cifsglob.h
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   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#ifndef _CIFS_GLOB_H
  20#define _CIFS_GLOB_H
  21
  22#include <linux/in.h>
  23#include <linux/in6.h>
  24#include <linux/slab.h>
  25#include <linux/mempool.h>
  26#include <linux/workqueue.h>
  27#include "cifs_fs_sb.h"
  28#include "cifsacl.h"
  29#include <crypto/internal/hash.h>
  30#include <linux/scatterlist.h>
  31#ifdef CONFIG_CIFS_SMB2
  32#include "smb2pdu.h"
  33#endif
  34
  35/*
  36 * The sizes of various internal tables and strings
  37 */
  38#define MAX_UID_INFO 16
  39#define MAX_SES_INFO 2
  40#define MAX_TCON_INFO 4
  41
  42#define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  43#define MAX_SERVER_SIZE 15
  44#define MAX_SHARE_SIZE 80
  45#define MAX_USERNAME_SIZE 256   /* reasonable maximum for current servers */
  46#define MAX_PASSWORD_SIZE 512   /* max for windows seems to be 256 wide chars */
  47
  48#define CIFS_MIN_RCV_POOL 4
  49
  50#define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
  51/*
  52 * default attribute cache timeout (jiffies)
  53 */
  54#define CIFS_DEF_ACTIMEO (1 * HZ)
  55
  56/*
  57 * max attribute cache timeout (jiffies) - 2^30
  58 */
  59#define CIFS_MAX_ACTIMEO (1 << 30)
  60
  61/*
  62 * MAX_REQ is the maximum number of requests that WE will send
  63 * on one socket concurrently.
  64 */
  65#define CIFS_MAX_REQ 32767
  66
  67#define RFC1001_NAME_LEN 15
  68#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  69
  70/* currently length of NIP6_FMT */
  71#define SERVER_NAME_LENGTH 40
  72#define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  73
  74/* used to define string lengths for reversing unicode strings */
  75/*         (256+1)*2 = 514                                     */
  76/*           (max path length + 1 for null) * 2 for unicode    */
  77#define MAX_NAME 514
  78
  79/* SMB echo "timeout" -- FIXME: tunable? */
  80#define SMB_ECHO_INTERVAL (60 * HZ)
  81
  82#include "cifspdu.h"
  83
  84#ifndef XATTR_DOS_ATTRIB
  85#define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  86#endif
  87
  88/*
  89 * CIFS vfs client Status information (based on what we know.)
  90 */
  91
  92/* associated with each tcp and smb session */
  93enum statusEnum {
  94        CifsNew = 0,
  95        CifsGood,
  96        CifsExiting,
  97        CifsNeedReconnect,
  98        CifsNeedNegotiate
  99};
 100
 101enum securityEnum {
 102        LANMAN = 0,                     /* Legacy LANMAN auth */
 103        NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 104        NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 105        RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 106/*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
 107        Kerberos,               /* Kerberos via SPNEGO */
 108};
 109
 110enum protocolEnum {
 111        TCP = 0,
 112        SCTP
 113        /* Netbios frames protocol not supported at this time */
 114};
 115
 116struct session_key {
 117        unsigned int len;
 118        char *response;
 119};
 120
 121/* crypto security descriptor definition */
 122struct sdesc {
 123        struct shash_desc shash;
 124        char ctx[];
 125};
 126
 127/* crypto hashing related structure/fields, not specific to a sec mech */
 128struct cifs_secmech {
 129        struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 130        struct crypto_shash *md5; /* md5 hash function */
 131        struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 132        struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 133};
 134
 135/* per smb session structure/fields */
 136struct ntlmssp_auth {
 137        __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 138        __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 139        unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 140        char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 141};
 142
 143struct cifs_cred {
 144        int uid;
 145        int gid;
 146        int mode;
 147        int cecount;
 148        struct cifs_sid osid;
 149        struct cifs_sid gsid;
 150        struct cifs_ntace *ntaces;
 151        struct cifs_ace *aces;
 152};
 153
 154/*
 155 *****************************************************************
 156 * Except the CIFS PDUs themselves all the
 157 * globally interesting structs should go here
 158 *****************************************************************
 159 */
 160
 161enum smb_version {
 162        Smb_1 = 1,
 163        Smb_21,
 164};
 165
 166struct mid_q_entry;
 167struct TCP_Server_Info;
 168struct cifsFileInfo;
 169struct cifs_ses;
 170struct cifs_tcon;
 171struct dfs_info3_param;
 172struct cifs_fattr;
 173struct smb_vol;
 174
 175struct smb_version_operations {
 176        int (*send_cancel)(struct TCP_Server_Info *, void *,
 177                           struct mid_q_entry *);
 178        bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 179        /* setup request: allocate mid, sign message */
 180        int (*setup_request)(struct cifs_ses *, struct kvec *, unsigned int,
 181                             struct mid_q_entry **);
 182        /* setup async request: allocate mid, sign message */
 183        int (*setup_async_request)(struct TCP_Server_Info *, struct kvec *,
 184                                   unsigned int, struct mid_q_entry **);
 185        /* check response: verify signature, map error */
 186        int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 187                             bool);
 188        void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
 189                            const int);
 190        void (*set_credits)(struct TCP_Server_Info *, const int);
 191        int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 192        unsigned int (*get_credits)(struct mid_q_entry *);
 193        __u64 (*get_next_mid)(struct TCP_Server_Info *);
 194        /* data offset from read response message */
 195        unsigned int (*read_data_offset)(char *);
 196        /* data length from read response message */
 197        unsigned int (*read_data_length)(char *);
 198        /* map smb to linux error */
 199        int (*map_error)(char *, bool);
 200        /* find mid corresponding to the response message */
 201        struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
 202        void (*dump_detail)(void *);
 203        void (*clear_stats)(struct cifs_tcon *);
 204        void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
 205        /* verify the message */
 206        int (*check_message)(char *, unsigned int);
 207        bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 208        /* process transaction2 response */
 209        bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
 210                             char *, int);
 211        /* check if we need to negotiate */
 212        bool (*need_neg)(struct TCP_Server_Info *);
 213        /* negotiate to the server */
 214        int (*negotiate)(const unsigned int, struct cifs_ses *);
 215        /* setup smb sessionn */
 216        int (*sess_setup)(const unsigned int, struct cifs_ses *,
 217                          const struct nls_table *);
 218        /* close smb session */
 219        int (*logoff)(const unsigned int, struct cifs_ses *);
 220        /* connect to a server share */
 221        int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
 222                            struct cifs_tcon *, const struct nls_table *);
 223        /* close tree connecion */
 224        int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
 225        /* get DFS referrals */
 226        int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
 227                             const char *, struct dfs_info3_param **,
 228                             unsigned int *, const struct nls_table *, int);
 229        /* informational QFS call */
 230        void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
 231        /* check if a path is accessible or not */
 232        int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
 233                                  struct cifs_sb_info *, const char *);
 234        /* query path data from the server */
 235        int (*query_path_info)(const unsigned int, struct cifs_tcon *,
 236                               struct cifs_sb_info *, const char *,
 237                               FILE_ALL_INFO *, bool *);
 238        /* get server index number */
 239        int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
 240                            struct cifs_sb_info *, const char *,
 241                            u64 *uniqueid, FILE_ALL_INFO *);
 242        /* build a full path to the root of the mount */
 243        char * (*build_path_to_root)(struct smb_vol *, struct cifs_sb_info *,
 244                                     struct cifs_tcon *);
 245        /* check if we can send an echo or nor */
 246        bool (*can_echo)(struct TCP_Server_Info *);
 247        /* send echo request */
 248        int (*echo)(struct TCP_Server_Info *);
 249        /* create directory */
 250        int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
 251                     struct cifs_sb_info *);
 252        /* set info on created directory */
 253        void (*mkdir_setinfo)(struct inode *, const char *,
 254                              struct cifs_sb_info *, struct cifs_tcon *,
 255                              const unsigned int);
 256        /* remove directory */
 257        int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
 258                     struct cifs_sb_info *);
 259};
 260
 261struct smb_version_values {
 262        char            *version_string;
 263        __u32           large_lock_type;
 264        __u32           exclusive_lock_type;
 265        __u32           shared_lock_type;
 266        __u32           unlock_lock_type;
 267        size_t          header_size;
 268        size_t          max_header_size;
 269        size_t          read_rsp_size;
 270        __le16          lock_cmd;
 271        unsigned int    cap_unix;
 272        unsigned int    cap_nt_find;
 273        unsigned int    cap_large_files;
 274};
 275
 276#define HEADER_SIZE(server) (server->vals->header_size)
 277#define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
 278
 279struct smb_vol {
 280        char *username;
 281        char *password;
 282        char *domainname;
 283        char *UNC;
 284        char *UNCip;
 285        char *iocharset;  /* local code page for mapping to and from Unicode */
 286        char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
 287        char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
 288        uid_t cred_uid;
 289        uid_t linux_uid;
 290        gid_t linux_gid;
 291        uid_t backupuid;
 292        gid_t backupgid;
 293        umode_t file_mode;
 294        umode_t dir_mode;
 295        unsigned secFlg;
 296        bool retry:1;
 297        bool intr:1;
 298        bool setuids:1;
 299        bool override_uid:1;
 300        bool override_gid:1;
 301        bool dynperm:1;
 302        bool noperm:1;
 303        bool no_psx_acl:1; /* set if posix acl support should be disabled */
 304        bool cifs_acl:1;
 305        bool backupuid_specified; /* mount option  backupuid  is specified */
 306        bool backupgid_specified; /* mount option  backupgid  is specified */
 307        bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 308        bool server_ino:1; /* use inode numbers from server ie UniqueId */
 309        bool direct_io:1;
 310        bool strict_io:1; /* strict cache behavior */
 311        bool remap:1;      /* set to remap seven reserved chars in filenames */
 312        bool posix_paths:1; /* unset to not ask for posix pathnames. */
 313        bool no_linux_ext:1;
 314        bool sfu_emul:1;
 315        bool nullauth:1;   /* attempt to authenticate with null user */
 316        bool nocase:1;     /* request case insensitive filenames */
 317        bool nobrl:1;      /* disable sending byte range locks to srv */
 318        bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
 319        bool seal:1;       /* request transport encryption on share */
 320        bool nodfs:1;      /* Do not request DFS, even if available */
 321        bool local_lease:1; /* check leases only on local system, not remote */
 322        bool noblocksnd:1;
 323        bool noautotune:1;
 324        bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 325        bool fsc:1;     /* enable fscache */
 326        bool mfsymlinks:1; /* use Minshall+French Symlinks */
 327        bool multiuser:1;
 328        bool rwpidforward:1; /* pid forward for read/write operations */
 329        unsigned int rsize;
 330        unsigned int wsize;
 331        bool sockopt_tcp_nodelay:1;
 332        unsigned short int port;
 333        unsigned long actimeo; /* attribute cache timeout (jiffies) */
 334        struct smb_version_operations *ops;
 335        struct smb_version_values *vals;
 336        char *prepath;
 337        struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 338        struct nls_table *local_nls;
 339};
 340
 341#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
 342                         CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
 343                         CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
 344                         CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
 345                         CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
 346                         CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
 347                         CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
 348                         CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
 349                         CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
 350                         CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
 351
 352#define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
 353                      MS_NODEV | MS_SYNCHRONOUS)
 354
 355struct cifs_mnt_data {
 356        struct cifs_sb_info *cifs_sb;
 357        struct smb_vol *vol;
 358        int flags;
 359};
 360
 361static inline unsigned int
 362get_rfc1002_length(void *buf)
 363{
 364        return be32_to_cpu(*((__be32 *)buf));
 365}
 366
 367static inline void
 368inc_rfc1001_len(void *buf, int count)
 369{
 370        be32_add_cpu((__be32 *)buf, count);
 371}
 372
 373struct TCP_Server_Info {
 374        struct list_head tcp_ses_list;
 375        struct list_head smb_ses_list;
 376        int srv_count; /* reference counter */
 377        /* 15 character server name + 0x20 16th byte indicating type = srv */
 378        char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 379        struct smb_version_operations   *ops;
 380        struct smb_version_values       *vals;
 381        enum statusEnum tcpStatus; /* what we think the status is */
 382        char *hostname; /* hostname portion of UNC string */
 383        struct socket *ssocket;
 384        struct sockaddr_storage dstaddr;
 385        struct sockaddr_storage srcaddr; /* locally bind to this IP */
 386#ifdef CONFIG_NET_NS
 387        struct net *net;
 388#endif
 389        wait_queue_head_t response_q;
 390        wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 391        struct list_head pending_mid_q;
 392        bool noblocksnd;                /* use blocking sendmsg */
 393        bool noautotune;                /* do not autotune send buf sizes */
 394        bool tcp_nodelay;
 395        int credits;  /* send no more requests at once */
 396        unsigned int in_flight;  /* number of requests on the wire to server */
 397        spinlock_t req_lock;  /* protect the two values above */
 398        struct mutex srv_mutex;
 399        struct task_struct *tsk;
 400        char server_GUID[16];
 401        __u16 sec_mode;
 402        bool session_estab; /* mark when very first sess is established */
 403#ifdef CONFIG_CIFS_SMB2
 404        int echo_credits;  /* echo reserved slots */
 405        int oplock_credits;  /* oplock break reserved slots */
 406        bool echoes:1; /* enable echoes */
 407#endif
 408        u16 dialect; /* dialect index that server chose */
 409        enum securityEnum secType;
 410        bool oplocks:1; /* enable oplocks */
 411        unsigned int maxReq;    /* Clients should submit no more */
 412        /* than maxReq distinct unanswered SMBs to the server when using  */
 413        /* multiplexed reads or writes */
 414        unsigned int maxBuf;    /* maxBuf specifies the maximum */
 415        /* message size the server can send or receive for non-raw SMBs */
 416        /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
 417        /* when socket is setup (and during reconnect) before NegProt sent */
 418        unsigned int max_rw;    /* maxRw specifies the maximum */
 419        /* message size the server can send or receive for */
 420        /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 421        unsigned int max_vcs;   /* maximum number of smb sessions, at least
 422                                   those that can be specified uniquely with
 423                                   vcnumbers */
 424        unsigned int capabilities; /* selective disabling of caps by smb sess */
 425        int timeAdj;  /* Adjust for difference in server time zone in sec */
 426        __u64 CurrentMid;         /* multiplex id - rotating counter */
 427        char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 428        /* 16th byte of RFC1001 workstation name is always null */
 429        char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 430        __u32 sequence_number; /* for signing, protected by srv_mutex */
 431        struct session_key session_key;
 432        unsigned long lstrp; /* when we got last response from this server */
 433        struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 434        /* extended security flavors that server supports */
 435        bool    sec_ntlmssp;            /* supports NTLMSSP */
 436        bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 437        bool    sec_kerberos;           /* supports plain Kerberos */
 438        bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 439        bool    large_buf;              /* is current buffer large? */
 440        struct delayed_work     echo; /* echo ping workqueue job */
 441        struct kvec *iov;       /* reusable kvec array for receives */
 442        unsigned int nr_iov;    /* number of kvecs in array */
 443        char    *smallbuf;      /* pointer to current "small" buffer */
 444        char    *bigbuf;        /* pointer to current "big" buffer */
 445        unsigned int total_read; /* total amount of data read in this pass */
 446#ifdef CONFIG_CIFS_FSCACHE
 447        struct fscache_cookie   *fscache; /* client index cache cookie */
 448#endif
 449#ifdef CONFIG_CIFS_STATS2
 450        atomic_t in_send; /* requests trying to send */
 451        atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 452#endif
 453#ifdef CONFIG_CIFS_SMB2
 454        unsigned int    max_read;
 455        unsigned int    max_write;
 456#endif /* CONFIG_CIFS_SMB2 */
 457};
 458
 459static inline unsigned int
 460in_flight(struct TCP_Server_Info *server)
 461{
 462        unsigned int num;
 463        spin_lock(&server->req_lock);
 464        num = server->in_flight;
 465        spin_unlock(&server->req_lock);
 466        return num;
 467}
 468
 469static inline bool
 470has_credits(struct TCP_Server_Info *server, int *credits)
 471{
 472        int num;
 473        spin_lock(&server->req_lock);
 474        num = *credits;
 475        spin_unlock(&server->req_lock);
 476        return num > 0;
 477}
 478
 479static inline void
 480add_credits(struct TCP_Server_Info *server, const unsigned int add,
 481            const int optype)
 482{
 483        server->ops->add_credits(server, add, optype);
 484}
 485
 486static inline void
 487set_credits(struct TCP_Server_Info *server, const int val)
 488{
 489        server->ops->set_credits(server, val);
 490}
 491
 492static inline __u64
 493get_next_mid(struct TCP_Server_Info *server)
 494{
 495        return server->ops->get_next_mid(server);
 496}
 497
 498/*
 499 * Macros to allow the TCP_Server_Info->net field and related code to drop out
 500 * when CONFIG_NET_NS isn't set.
 501 */
 502
 503#ifdef CONFIG_NET_NS
 504
 505static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 506{
 507        return srv->net;
 508}
 509
 510static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 511{
 512        srv->net = net;
 513}
 514
 515#else
 516
 517static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 518{
 519        return &init_net;
 520}
 521
 522static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 523{
 524}
 525
 526#endif
 527
 528/*
 529 * Session structure.  One of these for each uid session with a particular host
 530 */
 531struct cifs_ses {
 532        struct list_head smb_ses_list;
 533        struct list_head tcon_list;
 534        struct mutex session_mutex;
 535        struct TCP_Server_Info *server; /* pointer to server info */
 536        int ses_count;          /* reference counter */
 537        enum statusEnum status;
 538        unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 539        __u16 ipc_tid;          /* special tid for connection to IPC share */
 540        __u16 flags;
 541        __u16 vcnum;
 542        char *serverOS;         /* name of operating system underlying server */
 543        char *serverNOS;        /* name of network operating system of server */
 544        char *serverDomain;     /* security realm of server */
 545        __u64 Suid;             /* remote smb uid  */
 546        uid_t linux_uid;        /* overriding owner of files on the mount */
 547        uid_t cred_uid;         /* owner of credentials */
 548        unsigned int capabilities;
 549        char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 550                                TCP names - will ipv6 and sctp addresses fit? */
 551        char *user_name;        /* must not be null except during init of sess
 552                                   and after mount option parsing we fill it */
 553        char *domainName;
 554        char *password;
 555        struct session_key auth_key;
 556        struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 557        bool need_reconnect:1; /* connection reset, uid now invalid */
 558#ifdef CONFIG_CIFS_SMB2
 559        __u16 session_flags;
 560#endif /* CONFIG_CIFS_SMB2 */
 561};
 562/* no more than one of the following three session flags may be set */
 563#define CIFS_SES_NT4 1
 564#define CIFS_SES_OS2 2
 565#define CIFS_SES_W9X 4
 566/* following flag is set for old servers such as OS2 (and Win95?)
 567   which do not negotiate NTLM or POSIX dialects, but instead
 568   negotiate one of the older LANMAN dialects */
 569#define CIFS_SES_LANMAN 8
 570
 571static inline bool
 572cap_unix(struct cifs_ses *ses)
 573{
 574        return ses->server->vals->cap_unix & ses->capabilities;
 575}
 576
 577/*
 578 * there is one of these for each connection to a resource on a particular
 579 * session
 580 */
 581struct cifs_tcon {
 582        struct list_head tcon_list;
 583        int tc_count;
 584        struct list_head openFileList;
 585        struct cifs_ses *ses;   /* pointer to session associated with */
 586        char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 587        char *nativeFileSystem;
 588        char *password;         /* for share-level security */
 589        __u32 tid;              /* The 4 byte tree id */
 590        __u16 Flags;            /* optional support bits */
 591        enum statusEnum tidStatus;
 592#ifdef CONFIG_CIFS_STATS
 593        atomic_t num_smbs_sent;
 594        union {
 595                struct {
 596                        atomic_t num_writes;
 597                        atomic_t num_reads;
 598                        atomic_t num_flushes;
 599                        atomic_t num_oplock_brks;
 600                        atomic_t num_opens;
 601                        atomic_t num_closes;
 602                        atomic_t num_deletes;
 603                        atomic_t num_mkdirs;
 604                        atomic_t num_posixopens;
 605                        atomic_t num_posixmkdirs;
 606                        atomic_t num_rmdirs;
 607                        atomic_t num_renames;
 608                        atomic_t num_t2renames;
 609                        atomic_t num_ffirst;
 610                        atomic_t num_fnext;
 611                        atomic_t num_fclose;
 612                        atomic_t num_hardlinks;
 613                        atomic_t num_symlinks;
 614                        atomic_t num_locks;
 615                        atomic_t num_acl_get;
 616                        atomic_t num_acl_set;
 617                } cifs_stats;
 618#ifdef CONFIG_CIFS_SMB2
 619                struct {
 620                        atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
 621                        atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
 622                } smb2_stats;
 623#endif /* CONFIG_CIFS_SMB2 */
 624        } stats;
 625#ifdef CONFIG_CIFS_STATS2
 626        unsigned long long time_writes;
 627        unsigned long long time_reads;
 628        unsigned long long time_opens;
 629        unsigned long long time_deletes;
 630        unsigned long long time_closes;
 631        unsigned long long time_mkdirs;
 632        unsigned long long time_rmdirs;
 633        unsigned long long time_renames;
 634        unsigned long long time_t2renames;
 635        unsigned long long time_ffirst;
 636        unsigned long long time_fnext;
 637        unsigned long long time_fclose;
 638#endif /* CONFIG_CIFS_STATS2 */
 639        __u64    bytes_read;
 640        __u64    bytes_written;
 641        spinlock_t stat_lock;
 642#endif /* CONFIG_CIFS_STATS */
 643        FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 644        FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 645        FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 646        bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 647        bool retry:1;
 648        bool nocase:1;
 649        bool seal:1;      /* transport encryption for this mounted share */
 650        bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 651                                for this mount even if server would support */
 652        bool local_lease:1; /* check leases (only) on local system not remote */
 653        bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 654        bool need_reconnect:1; /* connection reset, tid now invalid */
 655#ifdef CONFIG_CIFS_SMB2
 656        bool print:1;           /* set if connection to printer share */
 657        bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
 658        __u32 capabilities;
 659        __u32 share_flags;
 660        __u32 maximal_access;
 661        __u32 vol_serial_number;
 662        __le64 vol_create_time;
 663#endif /* CONFIG_CIFS_SMB2 */
 664#ifdef CONFIG_CIFS_FSCACHE
 665        u64 resource_id;                /* server resource id */
 666        struct fscache_cookie *fscache; /* cookie for share */
 667#endif
 668        /* BB add field for back pointer to sb struct(s)? */
 669};
 670
 671/*
 672 * This is a refcounted and timestamped container for a tcon pointer. The
 673 * container holds a tcon reference. It is considered safe to free one of
 674 * these when the tl_count goes to 0. The tl_time is the time of the last
 675 * "get" on the container.
 676 */
 677struct tcon_link {
 678        struct rb_node          tl_rbnode;
 679        uid_t                   tl_uid;
 680        unsigned long           tl_flags;
 681#define TCON_LINK_MASTER        0
 682#define TCON_LINK_PENDING       1
 683#define TCON_LINK_IN_TREE       2
 684        unsigned long           tl_time;
 685        atomic_t                tl_count;
 686        struct cifs_tcon        *tl_tcon;
 687};
 688
 689extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 690
 691static inline struct cifs_tcon *
 692tlink_tcon(struct tcon_link *tlink)
 693{
 694        return tlink->tl_tcon;
 695}
 696
 697extern void cifs_put_tlink(struct tcon_link *tlink);
 698
 699static inline struct tcon_link *
 700cifs_get_tlink(struct tcon_link *tlink)
 701{
 702        if (tlink && !IS_ERR(tlink))
 703                atomic_inc(&tlink->tl_count);
 704        return tlink;
 705}
 706
 707/* This function is always expected to succeed */
 708extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 709
 710/*
 711 * This info hangs off the cifsFileInfo structure, pointed to by llist.
 712 * This is used to track byte stream locks on the file
 713 */
 714struct cifsLockInfo {
 715        struct list_head llist; /* pointer to next cifsLockInfo */
 716        struct list_head blist; /* pointer to locks blocked on this */
 717        wait_queue_head_t block_q;
 718        __u64 offset;
 719        __u64 length;
 720        __u32 pid;
 721        __u32 type;
 722};
 723
 724/*
 725 * One of these for each open instance of a file
 726 */
 727struct cifs_search_info {
 728        loff_t index_of_last_entry;
 729        __u16 entries_in_buffer;
 730        __u16 info_level;
 731        __u32 resume_key;
 732        char *ntwrk_buf_start;
 733        char *srch_entries_start;
 734        char *last_entry;
 735        const char *presume_name;
 736        unsigned int resume_name_len;
 737        bool endOfSearch:1;
 738        bool emptyDir:1;
 739        bool unicode:1;
 740        bool smallBuf:1; /* so we know which buf_release function to call */
 741};
 742
 743struct cifsFileInfo {
 744        struct list_head tlist; /* pointer to next fid owned by tcon */
 745        struct list_head flist; /* next fid (file instance) for this inode */
 746        struct list_head llist; /*
 747                                 * brlocks held by this fid, protected by
 748                                 * lock_mutex from cifsInodeInfo structure
 749                                 */
 750        unsigned int uid;       /* allows finding which FileInfo structure */
 751        __u32 pid;              /* process id who opened file */
 752        __u16 netfid;           /* file id from remote */
 753        /* BB add lock scope info here if needed */ ;
 754        /* lock scope id (0 if none) */
 755        struct dentry *dentry;
 756        unsigned int f_flags;
 757        struct tcon_link *tlink;
 758        bool invalidHandle:1;   /* file closed via session abend */
 759        bool oplock_break_cancelled:1;
 760        int count;              /* refcount protected by cifs_file_list_lock */
 761        struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 762        struct cifs_search_info srch_inf;
 763        struct work_struct oplock_break; /* work for oplock breaks */
 764};
 765
 766struct cifs_io_parms {
 767        __u16 netfid;
 768        __u32 pid;
 769        __u64 offset;
 770        unsigned int length;
 771        struct cifs_tcon *tcon;
 772};
 773
 774/*
 775 * Take a reference on the file private data. Must be called with
 776 * cifs_file_list_lock held.
 777 */
 778static inline void
 779cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
 780{
 781        ++cifs_file->count;
 782}
 783
 784struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
 785void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 786
 787/*
 788 * One of these for each file inode
 789 */
 790
 791struct cifsInodeInfo {
 792        bool can_cache_brlcks;
 793        struct mutex lock_mutex;        /*
 794                                         * protect the field above and llist
 795                                         * from every cifsFileInfo structure
 796                                         * from openFileList
 797                                         */
 798        /* BB add in lists for dirty pages i.e. write caching info for oplock */
 799        struct list_head openFileList;
 800        __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
 801        bool clientCanCacheRead;        /* read oplock */
 802        bool clientCanCacheAll;         /* read and writebehind oplock */
 803        bool delete_pending;            /* DELETE_ON_CLOSE is set */
 804        bool invalid_mapping;           /* pagecache is invalid */
 805        unsigned long time;             /* jiffies of last update of inode */
 806        u64  server_eof;                /* current file size on server -- protected by i_lock */
 807        u64  uniqueid;                  /* server inode number */
 808        u64  createtime;                /* creation time on server */
 809#ifdef CONFIG_CIFS_FSCACHE
 810        struct fscache_cookie *fscache;
 811#endif
 812        struct inode vfs_inode;
 813};
 814
 815static inline struct cifsInodeInfo *
 816CIFS_I(struct inode *inode)
 817{
 818        return container_of(inode, struct cifsInodeInfo, vfs_inode);
 819}
 820
 821static inline struct cifs_sb_info *
 822CIFS_SB(struct super_block *sb)
 823{
 824        return sb->s_fs_info;
 825}
 826
 827static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
 828{
 829        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 830                return '/';
 831        else
 832                return '\\';
 833}
 834
 835static inline void
 836convert_delimiter(char *path, char delim)
 837{
 838        int i;
 839        char old_delim;
 840
 841        if (path == NULL)
 842                return;
 843
 844        if (delim == '/')
 845                old_delim = '\\';
 846        else
 847                old_delim = '/';
 848
 849        for (i = 0; path[i] != '\0'; i++) {
 850                if (path[i] == old_delim)
 851                        path[i] = delim;
 852        }
 853}
 854
 855static inline char *
 856build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
 857                   struct cifs_tcon *tcon)
 858{
 859        if (!vol->ops->build_path_to_root)
 860                return NULL;
 861        return vol->ops->build_path_to_root(vol, cifs_sb, tcon);
 862}
 863
 864#ifdef CONFIG_CIFS_STATS
 865#define cifs_stats_inc atomic_inc
 866
 867static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
 868                                            unsigned int bytes)
 869{
 870        if (bytes) {
 871                spin_lock(&tcon->stat_lock);
 872                tcon->bytes_written += bytes;
 873                spin_unlock(&tcon->stat_lock);
 874        }
 875}
 876
 877static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
 878                                         unsigned int bytes)
 879{
 880        spin_lock(&tcon->stat_lock);
 881        tcon->bytes_read += bytes;
 882        spin_unlock(&tcon->stat_lock);
 883}
 884#else
 885
 886#define  cifs_stats_inc(field) do {} while (0)
 887#define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
 888#define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
 889
 890#endif
 891
 892
 893/*
 894 * This is the prototype for the mid receive function. This function is for
 895 * receiving the rest of the SMB frame, starting with the WordCount (which is
 896 * just after the MID in struct smb_hdr). Note:
 897 *
 898 * - This will be called by cifsd, with no locks held.
 899 * - The mid will still be on the pending_mid_q.
 900 * - mid->resp_buf will point to the current buffer.
 901 *
 902 * Returns zero on a successful receive, or an error. The receive state in
 903 * the TCP_Server_Info will also be updated.
 904 */
 905typedef int (mid_receive_t)(struct TCP_Server_Info *server,
 906                            struct mid_q_entry *mid);
 907
 908/*
 909 * This is the prototype for the mid callback function. This is called once the
 910 * mid has been received off of the socket. When creating one, take special
 911 * care to avoid deadlocks. Things to bear in mind:
 912 *
 913 * - it will be called by cifsd, with no locks held
 914 * - the mid will be removed from any lists
 915 */
 916typedef void (mid_callback_t)(struct mid_q_entry *mid);
 917
 918/* one of these for every pending CIFS request to the server */
 919struct mid_q_entry {
 920        struct list_head qhead; /* mids waiting on reply from this server */
 921        struct TCP_Server_Info *server; /* server corresponding to this mid */
 922        __u64 mid;              /* multiplex id */
 923        __u32 pid;              /* process id */
 924        __u32 sequence_number;  /* for CIFS signing */
 925        unsigned long when_alloc;  /* when mid was created */
 926#ifdef CONFIG_CIFS_STATS2
 927        unsigned long when_sent; /* time when smb send finished */
 928        unsigned long when_received; /* when demux complete (taken off wire) */
 929#endif
 930        mid_receive_t *receive; /* call receive callback */
 931        mid_callback_t *callback; /* call completion callback */
 932        void *callback_data;      /* general purpose pointer for callback */
 933        void *resp_buf;         /* pointer to received SMB header */
 934        int mid_state;  /* wish this were enum but can not pass to wait_event */
 935        __le16 command;         /* smb command code */
 936        bool large_buf:1;       /* if valid response, is pointer to large buf */
 937        bool multiRsp:1;        /* multiple trans2 responses for one request  */
 938        bool multiEnd:1;        /* both received */
 939};
 940
 941/*      Make code in transport.c a little cleaner by moving
 942        update of optional stats into function below */
 943#ifdef CONFIG_CIFS_STATS2
 944
 945static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
 946{
 947        atomic_inc(&server->in_send);
 948}
 949
 950static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
 951{
 952        atomic_dec(&server->in_send);
 953}
 954
 955static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
 956{
 957        atomic_inc(&server->num_waiters);
 958}
 959
 960static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
 961{
 962        atomic_dec(&server->num_waiters);
 963}
 964
 965static inline void cifs_save_when_sent(struct mid_q_entry *mid)
 966{
 967        mid->when_sent = jiffies;
 968}
 969#else
 970static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
 971{
 972}
 973static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
 974{
 975}
 976
 977static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
 978{
 979}
 980
 981static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
 982{
 983}
 984
 985static inline void cifs_save_when_sent(struct mid_q_entry *mid)
 986{
 987}
 988#endif
 989
 990/* for pending dnotify requests */
 991struct dir_notify_req {
 992        struct list_head lhead;
 993        __le16 Pid;
 994        __le16 PidHigh;
 995        __u16 Mid;
 996        __u16 Tid;
 997        __u16 Uid;
 998        __u16 netfid;
 999        __u32 filter; /* CompletionFilter (for multishot) */
1000        int multishot;
1001        struct file *pfile;
1002};
1003
1004struct dfs_info3_param {
1005        int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1006        int path_consumed;
1007        int server_type;
1008        int ref_flag;
1009        char *path_name;
1010        char *node_name;
1011};
1012
1013/*
1014 * common struct for holding inode info when searching for or updating an
1015 * inode with new info
1016 */
1017
1018#define CIFS_FATTR_DFS_REFERRAL         0x1
1019#define CIFS_FATTR_DELETE_PENDING       0x2
1020#define CIFS_FATTR_NEED_REVAL           0x4
1021#define CIFS_FATTR_INO_COLLISION        0x8
1022
1023struct cifs_fattr {
1024        u32             cf_flags;
1025        u32             cf_cifsattrs;
1026        u64             cf_uniqueid;
1027        u64             cf_eof;
1028        u64             cf_bytes;
1029        u64             cf_createtime;
1030        uid_t           cf_uid;
1031        gid_t           cf_gid;
1032        umode_t         cf_mode;
1033        dev_t           cf_rdev;
1034        unsigned int    cf_nlink;
1035        unsigned int    cf_dtype;
1036        struct timespec cf_atime;
1037        struct timespec cf_mtime;
1038        struct timespec cf_ctime;
1039};
1040
1041static inline void free_dfs_info_param(struct dfs_info3_param *param)
1042{
1043        if (param) {
1044                kfree(param->path_name);
1045                kfree(param->node_name);
1046                kfree(param);
1047        }
1048}
1049
1050static inline void free_dfs_info_array(struct dfs_info3_param *param,
1051                                       int number_of_items)
1052{
1053        int i;
1054        if ((number_of_items == 0) || (param == NULL))
1055                return;
1056        for (i = 0; i < number_of_items; i++) {
1057                kfree(param[i].path_name);
1058                kfree(param[i].node_name);
1059        }
1060        kfree(param);
1061}
1062
1063#define   MID_FREE 0
1064#define   MID_REQUEST_ALLOCATED 1
1065#define   MID_REQUEST_SUBMITTED 2
1066#define   MID_RESPONSE_RECEIVED 4
1067#define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1068#define   MID_RESPONSE_MALFORMED 0x10
1069#define   MID_SHUTDOWN           0x20
1070
1071/* Types of response buffer returned from SendReceive2 */
1072#define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1073#define   CIFS_SMALL_BUFFER     1
1074#define   CIFS_LARGE_BUFFER     2
1075#define   CIFS_IOVEC            4    /* array of response buffers */
1076
1077/* Type of Request to SendReceive2 */
1078#define   CIFS_BLOCKING_OP      1    /* operation can block */
1079#define   CIFS_ASYNC_OP         2    /* do not wait for response */
1080#define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1081#define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1082#define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1083#define   CIFS_NO_RESP      0x040    /* no response buffer required */
1084
1085/* Type of request operation */
1086#define   CIFS_ECHO_OP      0x080    /* echo request */
1087#define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1088#define   CIFS_NEG_OP      0x0200    /* negotiate request */
1089#define   CIFS_OP_MASK     0x0380    /* mask request type */
1090
1091/* Security Flags: indicate type of session setup needed */
1092#define   CIFSSEC_MAY_SIGN      0x00001
1093#define   CIFSSEC_MAY_NTLM      0x00002
1094#define   CIFSSEC_MAY_NTLMV2    0x00004
1095#define   CIFSSEC_MAY_KRB5      0x00008
1096#ifdef CONFIG_CIFS_WEAK_PW_HASH
1097#define   CIFSSEC_MAY_LANMAN    0x00010
1098#define   CIFSSEC_MAY_PLNTXT    0x00020
1099#else
1100#define   CIFSSEC_MAY_LANMAN    0
1101#define   CIFSSEC_MAY_PLNTXT    0
1102#endif /* weak passwords */
1103#define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1104#define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1105
1106#define   CIFSSEC_MUST_SIGN     0x01001
1107/* note that only one of the following can be set so the
1108result of setting MUST flags more than once will be to
1109require use of the stronger protocol */
1110#define   CIFSSEC_MUST_NTLM     0x02002
1111#define   CIFSSEC_MUST_NTLMV2   0x04004
1112#define   CIFSSEC_MUST_KRB5     0x08008
1113#ifdef CONFIG_CIFS_WEAK_PW_HASH
1114#define   CIFSSEC_MUST_LANMAN   0x10010
1115#define   CIFSSEC_MUST_PLNTXT   0x20020
1116#ifdef CONFIG_CIFS_UPCALL
1117#define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1118#else
1119#define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1120#endif /* UPCALL */
1121#else /* do not allow weak pw hash */
1122#define   CIFSSEC_MUST_LANMAN   0
1123#define   CIFSSEC_MUST_PLNTXT   0
1124#ifdef CONFIG_CIFS_UPCALL
1125#define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1126#else
1127#define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1128#endif /* UPCALL */
1129#endif /* WEAK_PW_HASH */
1130#define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1131#define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1132
1133#define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
1134#define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1135#define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1136/*
1137 *****************************************************************
1138 * All constants go here
1139 *****************************************************************
1140 */
1141
1142#define UID_HASH (16)
1143
1144/*
1145 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1146 * following to be declared.
1147 */
1148
1149/****************************************************************************
1150 *  Locking notes.  All updates to global variables and lists should be
1151 *                  protected by spinlocks or semaphores.
1152 *
1153 *  Spinlocks
1154 *  ---------
1155 *  GlobalMid_Lock protects:
1156 *      list operations on pending_mid_q and oplockQ
1157 *      updates to XID counters, multiplex id  and SMB sequence numbers
1158 *  cifs_file_list_lock protects:
1159 *      list operations on tcp and SMB session lists and tCon lists
1160 *  f_owner.lock protects certain per file struct operations
1161 *  mapping->page_lock protects certain per page operations
1162 *
1163 *  Semaphores
1164 *  ----------
1165 *  sesSem     operations on smb session
1166 *  tconSem    operations on tree connection
1167 *  fh_sem      file handle reconnection operations
1168 *
1169 ****************************************************************************/
1170
1171#ifdef DECLARE_GLOBALS_HERE
1172#define GLOBAL_EXTERN
1173#else
1174#define GLOBAL_EXTERN extern
1175#endif
1176
1177/*
1178 * the list of TCP_Server_Info structures, ie each of the sockets
1179 * connecting our client to a distinct server (ip address), is
1180 * chained together by cifs_tcp_ses_list. The list of all our SMB
1181 * sessions (and from that the tree connections) can be found
1182 * by iterating over cifs_tcp_ses_list
1183 */
1184GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1185
1186/*
1187 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1188 * tcp session, and the list of tcon's per smb session. It also protects
1189 * the reference counters for the server, smb session, and tcon. Finally,
1190 * changes to the tcon->tidStatus should be done while holding this lock.
1191 */
1192GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1193
1194/*
1195 * This lock protects the cifs_file->llist and cifs_file->flist
1196 * list operations, and updates to some flags (cifs_file->invalidHandle)
1197 * It will be moved to either use the tcon->stat_lock or equivalent later.
1198 * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
1199 * the cifs_tcp_ses_lock must be grabbed first and released last.
1200 */
1201GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
1202
1203#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1204/* Outstanding dir notify requests */
1205GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1206/* DirNotify response queue */
1207GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1208#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1209
1210/*
1211 * Global transaction id (XID) information
1212 */
1213GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1214GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1215GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1216GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1217                                          /* on midQ entries */
1218/*
1219 *  Global counters, updated atomically
1220 */
1221GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1222GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1223GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1224GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1225GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1226
1227/* Various Debug counters */
1228GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1229#ifdef CONFIG_CIFS_STATS2
1230GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1231GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1232#endif
1233GLOBAL_EXTERN atomic_t smBufAllocCount;
1234GLOBAL_EXTERN atomic_t midCount;
1235
1236/* Misc globals */
1237GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1238GLOBAL_EXTERN unsigned int lookupCacheEnabled;
1239GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1240                                with more secure ntlmssp2 challenge/resp */
1241GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1242GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1243GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1244GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1245GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1246GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1247
1248#ifdef CONFIG_CIFS_ACL
1249GLOBAL_EXTERN struct rb_root uidtree;
1250GLOBAL_EXTERN struct rb_root gidtree;
1251GLOBAL_EXTERN spinlock_t siduidlock;
1252GLOBAL_EXTERN spinlock_t sidgidlock;
1253GLOBAL_EXTERN struct rb_root siduidtree;
1254GLOBAL_EXTERN struct rb_root sidgidtree;
1255GLOBAL_EXTERN spinlock_t uidsidlock;
1256GLOBAL_EXTERN spinlock_t gidsidlock;
1257#endif /* CONFIG_CIFS_ACL */
1258
1259void cifs_oplock_break(struct work_struct *work);
1260
1261extern const struct slow_work_ops cifs_oplock_break_ops;
1262extern struct workqueue_struct *cifsiod_wq;
1263
1264extern mempool_t *cifs_mid_poolp;
1265
1266/* Operations for different SMB versions */
1267#define SMB1_VERSION_STRING     "1.0"
1268extern struct smb_version_operations smb1_operations;
1269extern struct smb_version_values smb1_values;
1270#define SMB21_VERSION_STRING    "2.1"
1271extern struct smb_version_operations smb21_operations;
1272extern struct smb_version_values smb21_values;
1273#endif  /* _CIFS_GLOB_H */
1274
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