/*
   *   fs/cifs/cifsglob.h
   *

   *   Copyright (C) International Business Machines  Corp., 2002,2008

   *   Author(s): Steve French (sfrench@us.ibm.com)

   *              Jeremy Allison (jra@samba.org)

   *
   *   This library is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU Lesser General Public License as published
   *   by the Free Software Foundation; either version 2.1 of the License, or
   *   (at your option) any later version.
   *
   *   This library is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU Lesser General Public License for more details.

   *

   */

  #ifndef _CIFS_GLOB_H
  #define _CIFS_GLOB_H

  #include <linux/in.h>
  #include <linux/in6.h>

  #include <linux/slab.h>

  #include <linux/workqueue.h>

  #include "cifs_fs_sb.h"

  #include "cifsacl.h"

  /*
   * The sizes of various internal tables and strings
   */
  #define MAX_UID_INFO 16
  #define MAX_SES_INFO 2
  #define MAX_TCON_INFO 4

  #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)

  #define MAX_SERVER_SIZE 15

  #define MAX_SHARE_SIZE  64	/* used to be 20, this should still be enough */

  #define MAX_USERNAME_SIZE 32	/* 32 is to allow for 15 char names + null
  				   termination then *2 for unicode versions */

  #define MAX_PASSWORD_SIZE 512  /* max for windows seems to be 256 wide chars */

  
  #define CIFS_MIN_RCV_POOL 4
  
  /*
   * MAX_REQ is the maximum number of requests that WE will send

   * on one socket concurrently. It also matches the most common

   * value of max multiplex returned by servers.  We may

   * eventually want to use the negotiated value (in case
   * future servers can handle more) when we are more confident that
   * we will not have problems oveloading the socket with pending
   * write data.
   */

  #define CIFS_MAX_REQ 50

  #define RFC1001_NAME_LEN 15
  #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  
  /* currently length of NIP6_FMT */
  #define SERVER_NAME_LENGTH 40

  #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  
  /* used to define string lengths for reversing unicode strings */
  /*         (256+1)*2 = 514                                     */
  /*           (max path length + 1 for null) * 2 for unicode    */
  #define MAX_NAME 514
  
  #include "cifspdu.h"

  #ifndef XATTR_DOS_ATTRIB
  #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  #endif
  
  /*

   * CIFS vfs client Status information (based on what we know.)
   */
  
   /* associated with each tcp and smb session */
  enum statusEnum {
  	CifsNew = 0,
  	CifsGood,
  	CifsExiting,
  	CifsNeedReconnect
  };
  
  enum securityEnum {

  	LANMAN = 0,			/* Legacy LANMAN auth */

  	NTLM,			/* Legacy NTLM012 auth with NTLM hash */

  	NTLMv2,			/* Legacy NTLM auth with NTLMv2 hash */

  	RawNTLMSSP,		/* NTLMSSP without SPNEGO, NTLMv2 hash */

  /*	NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */

  	Kerberos,		/* Kerberos via SPNEGO */

  };
  
  enum protocolEnum {

  	TCP = 0,

  	SCTP
  	/* Netbios frames protocol not supported at this time */
  };

  struct mac_key {
  	unsigned int len;
  	union {
  		char ntlm[CIFS_SESS_KEY_SIZE + 16];

  		char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */

  		struct {
  			char key[16];
  			struct ntlmv2_resp resp;
  		} ntlmv2;
  	} data;
  };

  struct cifs_cred {
  	int uid;
  	int gid;
  	int mode;
  	int cecount;
  	struct cifs_sid osid;
  	struct cifs_sid gsid;
  	struct cifs_ntace *ntaces;
  	struct cifs_ace *aces;
  };

  /*
   *****************************************************************
   * Except the CIFS PDUs themselves all the
   * globally interesting structs should go here
   *****************************************************************
   */
  
  struct TCP_Server_Info {

  	struct list_head tcp_ses_list;
  	struct list_head smb_ses_list;

  	int srv_count; /* reference counter */

  	/* 15 character server name + 0x20 16th byte indicating type = srv */

  	char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];

  	char *hostname; /* hostname portion of UNC string */

  	struct socket *ssocket;
  	union {
  		struct sockaddr_in sockAddr;
  		struct sockaddr_in6 sockAddr6;
  	} addr;

  	wait_queue_head_t response_q;

  	wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
  	struct list_head pending_mid_q;
  	void *Server_NlsInfo;	/* BB - placeholder for future NLS info  */
  	unsigned short server_codepage;	/* codepage for the server    */

  	enum protocolEnum protocolType;

  	char versionMajor;
  	char versionMinor;

  	bool svlocal:1;			/* local server or remote */

  	bool noblocksnd;		/* use blocking sendmsg */
  	bool noautotune;		/* do not autotune send buf sizes */

  	bool tcp_nodelay;

  	atomic_t inFlight;  /* number of requests on the wire to server */

  #ifdef CONFIG_CIFS_STATS2
  	atomic_t inSend; /* requests trying to send */
  	atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
  #endif

  	enum statusEnum tcpStatus; /* what we think the status is */

  	struct mutex srv_mutex;

  	struct task_struct *tsk;
  	char server_GUID[16];
  	char secMode;
  	enum securityEnum secType;
  	unsigned int maxReq;	/* Clients should submit no more */
  	/* than maxReq distinct unanswered SMBs to the server when using  */
  	/* multiplexed reads or writes */
  	unsigned int maxBuf;	/* maxBuf specifies the maximum */
  	/* message size the server can send or receive for non-raw SMBs */

  	unsigned int max_rw;	/* maxRw specifies the maximum */

  	/* message size the server can send or receive for */
  	/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */

  	unsigned int max_vcs;	/* maximum number of smb sessions, at least
  				   those that can be specified uniquely with
  				   vcnumbers */

  	char sessid[4];		/* unique token id for this session */
  	/* (returned on Negotiate */
  	int capabilities; /* allow selective disabling of caps by smb sess */

  	int timeAdj;  /* Adjust for difference in server time zone in sec */

  	__u16 CurrentMid;         /* multiplex id - rotating counter */

  	char cryptKey[CIFS_CRYPTO_KEY_SIZE];

  	/* 16th byte of RFC1001 workstation name is always null */

  	char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];

  	__u32 sequence_number; /* needed for CIFS PDU signature */

  	struct mac_key mac_signing_key;
  	char ntlmv2_hash[16];

  	unsigned long lstrp; /* when we got last response from this server */

  	u16 dialect; /* dialect index that server chose */

  	/* extended security flavors that server supports */
  	bool	sec_kerberos;		/* supports plain Kerberos */
  	bool	sec_mskerberos;		/* supports legacy MS Kerberos */
  	bool	sec_kerberosu2u;	/* supports U2U Kerberos */
  	bool	sec_ntlmssp;		/* supports NTLMSSP */

  #ifdef CONFIG_CIFS_FSCACHE
  	struct fscache_cookie   *fscache; /* client index cache cookie */
  #endif

  };
  
  /*

   * Session structure.  One of these for each uid session with a particular host
   */
  struct cifsSesInfo {

  	struct list_head smb_ses_list;

  	struct list_head tcon_list;

  	struct mutex session_mutex;

  	struct TCP_Server_Info *server;	/* pointer to server info */

  	int ses_count;		/* reference counter */

  	enum statusEnum status;

  	unsigned overrideSecFlg;  /* if non-zero override global sec flags */

  	__u16 ipc_tid;		/* special tid for connection to IPC share */
  	__u16 flags;

  	__u16 vcnum;

  	char *serverOS;		/* name of operating system underlying server */
  	char *serverNOS;	/* name of network operating system of server */

  	char *serverDomain;	/* security realm of server */
  	int Suid;		/* remote smb uid  */

  	uid_t linux_uid;        /* overriding owner of files on the mount */
  	uid_t cred_uid;		/* owner of credentials */

  	int capabilities;

  	char serverName[SERVER_NAME_LEN_WITH_NULL * 2];	/* BB make bigger for

  				TCP names - will ipv6 and sctp addresses fit? */

  	char userName[MAX_USERNAME_SIZE + 1];

  	char *domainName;
  	char *password;

  	bool need_reconnect:1; /* connection reset, uid now invalid */

  };

  /* no more than one of the following three session flags may be set */

  #define CIFS_SES_NT4 1

  #define CIFS_SES_OS2 2
  #define CIFS_SES_W9X 4
  /* following flag is set for old servers such as OS2 (and Win95?)
     which do not negotiate NTLM or POSIX dialects, but instead
     negotiate one of the older LANMAN dialects */
  #define CIFS_SES_LANMAN 8

  /*
   * there is one of these for each connection to a resource on a particular

   * session

   */
  struct cifsTconInfo {

  	struct list_head tcon_list;
  	int tc_count;

  	struct list_head openFileList;

  	struct cifsSesInfo *ses;	/* pointer to session associated with */

  	char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */

  	char *nativeFileSystem;

  	char *password;		/* for share-level security */

  	__u16 tid;		/* The 2 byte tree id */
  	__u16 Flags;		/* optional support bits */
  	enum statusEnum tidStatus;

  #ifdef CONFIG_CIFS_STATS
  	atomic_t num_smbs_sent;
  	atomic_t num_writes;
  	atomic_t num_reads;

  	atomic_t num_flushes;

  	atomic_t num_oplock_brks;
  	atomic_t num_opens;

  	atomic_t num_closes;

  	atomic_t num_deletes;
  	atomic_t num_mkdirs;

  	atomic_t num_posixopens;
  	atomic_t num_posixmkdirs;

  	atomic_t num_rmdirs;
  	atomic_t num_renames;
  	atomic_t num_t2renames;

  	atomic_t num_ffirst;
  	atomic_t num_fnext;
  	atomic_t num_fclose;

  	atomic_t num_hardlinks;
  	atomic_t num_symlinks;
  	atomic_t num_locks;

  	atomic_t num_acl_get;
  	atomic_t num_acl_set;

  #ifdef CONFIG_CIFS_STATS2
  	unsigned long long time_writes;
  	unsigned long long time_reads;
  	unsigned long long time_opens;
  	unsigned long long time_deletes;
  	unsigned long long time_closes;
  	unsigned long long time_mkdirs;
  	unsigned long long time_rmdirs;
  	unsigned long long time_renames;
  	unsigned long long time_t2renames;
  	unsigned long long time_ffirst;
  	unsigned long long time_fnext;
  	unsigned long long time_fclose;
  #endif /* CONFIG_CIFS_STATS2 */

  	__u64    bytes_read;
  	__u64    bytes_written;
  	spinlock_t stat_lock;

  #endif /* CONFIG_CIFS_STATS */

  	FILE_SYSTEM_DEVICE_INFO fsDevInfo;

  	FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */

  	FILE_SYSTEM_UNIX_INFO fsUnixInfo;

  	bool ipc:1;		/* set if connection to IPC$ eg for RPC/PIPES */
  	bool retry:1;
  	bool nocase:1;

  	bool seal:1;      /* transport encryption for this mounted share */

  	bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol

  				for this mount even if server would support */

  	bool local_lease:1; /* check leases (only) on local system not remote */

  	bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */

  	bool need_reconnect:1; /* connection reset, tid now invalid */

  #ifdef CONFIG_CIFS_FSCACHE
  	u64 resource_id;		/* server resource id */
  	struct fscache_cookie *fscache;	/* cookie for share */
  #endif

  	/* BB add field for back pointer to sb struct(s)? */

  };
  
  /*

   * This info hangs off the cifsFileInfo structure, pointed to by llist.
   * This is used to track byte stream locks on the file

   */
  struct cifsLockInfo {

  	struct list_head llist;	/* pointer to next cifsLockInfo */
  	__u64 offset;
  	__u64 length;
  	__u8 type;

  };
  
  /*
   * One of these for each open instance of a file
   */
  struct cifs_search_info {
  	loff_t index_of_last_entry;
  	__u16 entries_in_buffer;
  	__u16 info_level;
  	__u32 resume_key;

  	char *ntwrk_buf_start;
  	char *srch_entries_start;

  	char *last_entry;

  	char *presume_name;

  	unsigned int resume_name_len;

  	bool endOfSearch:1;
  	bool emptyDir:1;
  	bool unicode:1;
  	bool smallBuf:1; /* so we know which buf_release function to call */

  };
  
  struct cifsFileInfo {
  	struct list_head tlist;	/* pointer to next fid owned by tcon */
  	struct list_head flist;	/* next fid (file instance) for this inode */
  	unsigned int uid;	/* allows finding which FileInfo structure */
  	__u32 pid;		/* process id who opened file */
  	__u16 netfid;		/* file id from remote */
  	/* BB add lock scope info here if needed */ ;
  	/* lock scope id (0 if none) */

  	struct file *pfile; /* needed for writepage */
  	struct inode *pInode; /* needed for oplock break */

  	struct vfsmount *mnt;

  	struct mutex lock_mutex;

  	struct list_head llist; /* list of byte range locks we have. */

  	bool closePend:1;	/* file is marked to close */
  	bool invalidHandle:1;	/* file closed via session abend */

  	bool oplock_break_cancelled:1;

  	atomic_t count;		/* reference count */

  	struct mutex fh_mutex; /* prevents reopen race after dead ses*/

  	struct cifs_search_info srch_inf;

  	struct work_struct oplock_break; /* work for oplock breaks */

  };

  /* Take a reference on the file private data */
  static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
  {
  	atomic_inc(&cifs_file->count);
  }
  
  /* Release a reference on the file private data */
  static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
  {

  	if (atomic_dec_and_test(&cifs_file->count)) {
  		iput(cifs_file->pInode);

  		kfree(cifs_file);

  	}

  }

  /*
   * One of these for each file inode
   */
  
  struct cifsInodeInfo {
  	struct list_head lockList;

  	/* BB add in lists for dirty pages i.e. write caching info for oplock */

  	struct list_head openFileList;
  	int write_behind_rc;
  	__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */

  	unsigned long time;	/* jiffies of last update/check of inode */

  	bool clientCanCacheRead:1;	/* read oplock */
  	bool clientCanCacheAll:1;	/* read and writebehind oplock */

  	bool delete_pending:1;		/* DELETE_ON_CLOSE is set */

  	bool invalid_mapping:1;		/* pagecache is invalid */

  	u64  server_eof;		/* current file size on server */

  	u64  uniqueid;			/* server inode number */

  #ifdef CONFIG_CIFS_FSCACHE
  	struct fscache_cookie *fscache;
  #endif

  	struct inode vfs_inode;
  };
  
  static inline struct cifsInodeInfo *
  CIFS_I(struct inode *inode)
  {
  	return container_of(inode, struct cifsInodeInfo, vfs_inode);
  }
  
  static inline struct cifs_sb_info *
  CIFS_SB(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }

  static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)

  {
  	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
  		return '/';
  	else
  		return '\\';
  }

  #ifdef CONFIG_CIFS_STATS
  #define cifs_stats_inc atomic_inc
  
  static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
  					    unsigned int bytes)
  {
  	if (bytes) {
  		spin_lock(&tcon->stat_lock);
  		tcon->bytes_written += bytes;
  		spin_unlock(&tcon->stat_lock);
  	}
  }
  
  static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
  					 unsigned int bytes)
  {
  	spin_lock(&tcon->stat_lock);
  	tcon->bytes_read += bytes;
  	spin_unlock(&tcon->stat_lock);
  }
  #else

  #define  cifs_stats_inc(field) do {} while (0)
  #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
  #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)

  
  #endif

  /* one of these for every pending CIFS request to the server */
  struct mid_q_entry {
  	struct list_head qhead;	/* mids waiting on reply from this server */
  	__u16 mid;		/* multiplex id */
  	__u16 pid;		/* process id */
  	__u32 sequence_number;  /* for CIFS signing */

  	unsigned long when_alloc;  /* when mid was created */
  #ifdef CONFIG_CIFS_STATS2
  	unsigned long when_sent; /* time when smb send finished */
  	unsigned long when_received; /* when demux complete (taken off wire) */
  #endif

  	struct task_struct *tsk;	/* task waiting for response */
  	struct smb_hdr *resp_buf;	/* response buffer */
  	int midState;	/* wish this were enum but can not pass to wait_event */

  	__u8 command;	/* smb command code */

  	bool largeBuf:1;	/* if valid response, is pointer to large buf */
  	bool multiRsp:1;	/* multiple trans2 responses for one request  */
  	bool multiEnd:1;	/* both received */

  };
  
  struct oplock_q_entry {
  	struct list_head qhead;

  	struct inode *pinode;
  	struct cifsTconInfo *tcon;

  	__u16 netfid;
  };

  /* for pending dnotify requests */
  struct dir_notify_req {
         struct list_head lhead;
         __le16 Pid;
         __le16 PidHigh;
         __u16 Mid;
         __u16 Tid;
         __u16 Uid;
         __u16 netfid;
         __u32 filter; /* CompletionFilter (for multishot) */
         int multishot;

         struct file *pfile;

  };

  struct dfs_info3_param {
  	int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/

  	int path_consumed;

  	int server_type;
  	int ref_flag;
  	char *path_name;
  	char *node_name;
  };

  /*
   * common struct for holding inode info when searching for or updating an
   * inode with new info
   */
  
  #define CIFS_FATTR_DFS_REFERRAL		0x1

  #define CIFS_FATTR_DELETE_PENDING	0x2
  #define CIFS_FATTR_NEED_REVAL		0x4

  #define CIFS_FATTR_INO_COLLISION	0x8

  
  struct cifs_fattr {
  	u32		cf_flags;
  	u32		cf_cifsattrs;
  	u64		cf_uniqueid;
  	u64		cf_eof;
  	u64		cf_bytes;
  	uid_t		cf_uid;
  	gid_t		cf_gid;
  	umode_t		cf_mode;
  	dev_t		cf_rdev;
  	unsigned int	cf_nlink;
  	unsigned int	cf_dtype;
  	struct timespec	cf_atime;
  	struct timespec	cf_mtime;
  	struct timespec	cf_ctime;
  };

  static inline void free_dfs_info_param(struct dfs_info3_param *param)
  {
  	if (param) {
  		kfree(param->path_name);
  		kfree(param->node_name);
  		kfree(param);
  	}
  }
  
  static inline void free_dfs_info_array(struct dfs_info3_param *param,
  				       int number_of_items)
  {
  	int i;
  	if ((number_of_items == 0) || (param == NULL))
  		return;
  	for (i = 0; i < number_of_items; i++) {
  		kfree(param[i].path_name);
  		kfree(param[i].node_name);
  	}
  	kfree(param);
  }

  #define   MID_FREE 0
  #define   MID_REQUEST_ALLOCATED 1
  #define   MID_REQUEST_SUBMITTED 2
  #define   MID_RESPONSE_RECEIVED 4
  #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
  #define   MID_NO_RESP_NEEDED 0x10

  
  /* Types of response buffer returned from SendReceive2 */
  #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
  #define   CIFS_SMALL_BUFFER     1
  #define   CIFS_LARGE_BUFFER     2
  #define   CIFS_IOVEC            4    /* array of response buffers */

  /* Type of Request to SendReceive2 */
  #define   CIFS_STD_OP	        0    /* normal request timeout */
  #define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
  #define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
  #define   CIFS_BLOCKING_OP      4    /* operation can block */
  #define   CIFS_ASYNC_OP         8    /* do not wait for response */
  #define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
  #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
  #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
  #define   CIFS_NO_RESP      0x040    /* no response buffer required */

  /* Security Flags: indicate type of session setup needed */
  #define   CIFSSEC_MAY_SIGN	0x00001
  #define   CIFSSEC_MAY_NTLM	0x00002
  #define   CIFSSEC_MAY_NTLMV2	0x00004
  #define   CIFSSEC_MAY_KRB5	0x00008
  #ifdef CONFIG_CIFS_WEAK_PW_HASH
  #define   CIFSSEC_MAY_LANMAN	0x00010
  #define   CIFSSEC_MAY_PLNTXT	0x00020

  #else
  #define   CIFSSEC_MAY_LANMAN    0
  #define   CIFSSEC_MAY_PLNTXT    0

  #endif /* weak passwords */
  #define   CIFSSEC_MAY_SEAL	0x00040 /* not supported yet */

  #define   CIFSSEC_MAY_NTLMSSP	0x00080 /* raw ntlmssp with ntlmv2 */

  
  #define   CIFSSEC_MUST_SIGN	0x01001
  /* note that only one of the following can be set so the
  result of setting MUST flags more than once will be to
  require use of the stronger protocol */
  #define   CIFSSEC_MUST_NTLM	0x02002
  #define   CIFSSEC_MUST_NTLMV2	0x04004
  #define   CIFSSEC_MUST_KRB5	0x08008
  #ifdef CONFIG_CIFS_WEAK_PW_HASH
  #define   CIFSSEC_MUST_LANMAN	0x10010
  #define   CIFSSEC_MUST_PLNTXT	0x20020

  #ifdef CONFIG_CIFS_UPCALL

  #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */

  #else

  #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */

  #endif /* UPCALL */

  #else /* do not allow weak pw hash */
  #ifdef CONFIG_CIFS_UPCALL

  #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */

  #else

  #define	  CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */

  #endif /* UPCALL */

  #endif /* WEAK_PW_HASH */
  #define   CIFSSEC_MUST_SEAL	0x40040 /* not supported yet */

  #define   CIFSSEC_MUST_NTLMSSP	0x80080 /* raw ntlmssp with ntlmv2 */

  #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
  #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)

  #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)

  /*
   *****************************************************************
   * All constants go here
   *****************************************************************
   */
  
  #define UID_HASH (16)
  
  /*
   * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
   * following to be declared.
   */
  
  /****************************************************************************
   *  Locking notes.  All updates to global variables and lists should be
   *                  protected by spinlocks or semaphores.
   *
   *  Spinlocks
   *  ---------
   *  GlobalMid_Lock protects:
   *	list operations on pending_mid_q and oplockQ
   *      updates to XID counters, multiplex id  and SMB sequence numbers
   *  GlobalSMBSesLock protects:
   *	list operations on tcp and SMB session lists and tCon lists
   *  f_owner.lock protects certain per file struct operations
   *  mapping->page_lock protects certain per page operations
   *
   *  Semaphores
   *  ----------
   *  sesSem     operations on smb session
   *  tconSem    operations on tree connection

   *  fh_sem      file handle reconnection operations

   *
   ****************************************************************************/
  
  #ifdef DECLARE_GLOBALS_HERE
  #define GLOBAL_EXTERN
  #else
  #define GLOBAL_EXTERN extern
  #endif

  /*
   * the list of TCP_Server_Info structures, ie each of the sockets

   * connecting our client to a distinct server (ip address), is

   * chained together by cifs_tcp_ses_list. The list of all our SMB

   * sessions (and from that the tree connections) can be found

   * by iterating over cifs_tcp_ses_list
   */
  GLOBAL_EXTERN struct list_head		cifs_tcp_ses_list;

  /*
   * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
   * tcp session, and the list of tcon's per smb session. It also protects
   * the reference counters for the server, smb session, and tcon. Finally,
   * changes to the tcon->tidStatus should be done while holding this lock.
   */

  GLOBAL_EXTERN rwlock_t		cifs_tcp_ses_lock;

  
  /*
   * This lock protects the cifs_file->llist and cifs_file->flist
   * list operations, and updates to some flags (cifs_file->invalidHandle)
   * It will be moved to either use the tcon->stat_lock or equivalent later.
   * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
   * the cifs_tcp_ses_lock must be grabbed first and released last.
   */
  GLOBAL_EXTERN rwlock_t GlobalSMBSeslock;

  /* Outstanding dir notify requests */
  GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
  /* DirNotify response queue */
  GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;

  /*
   * Global transaction id (XID) information
   */
  GLOBAL_EXTERN unsigned int GlobalCurrentXid;	/* protected by GlobalMid_Sem */

  GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */

  GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;	/* prot by GlobalMid_Sem */

  GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
  					  /* on midQ entries */

  GLOBAL_EXTERN char Local_System_Name[15];
  
  /*
   *  Global counters, updated atomically
   */
  GLOBAL_EXTERN atomic_t sesInfoAllocCount;
  GLOBAL_EXTERN atomic_t tconInfoAllocCount;
  GLOBAL_EXTERN atomic_t tcpSesAllocCount;
  GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
  GLOBAL_EXTERN atomic_t tconInfoReconnectCount;

  /* Various Debug counters */

  GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
  #ifdef CONFIG_CIFS_STATS2
  GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
  GLOBAL_EXTERN atomic_t totSmBufAllocCount;
  #endif
  GLOBAL_EXTERN atomic_t smBufAllocCount;

  GLOBAL_EXTERN atomic_t midCount;
  
  /* Misc globals */

  GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions

  				to be established on existing mount if we

  				have the uid/password or Kerberos credential

  				or equivalent for current user */
  GLOBAL_EXTERN unsigned int oplockEnabled;
  GLOBAL_EXTERN unsigned int experimEnabled;
  GLOBAL_EXTERN unsigned int lookupCacheEnabled;

  GLOBAL_EXTERN unsigned int global_secflags;	/* if on, session setup sent

  				with more secure ntlmssp2 challenge/resp */

  GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
  GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
  GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
  GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
  GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
  GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/

  void cifs_oplock_break(struct work_struct *work);
  void cifs_oplock_break_get(struct cifsFileInfo *cfile);
  void cifs_oplock_break_put(struct cifsFileInfo *cfile);

  extern const struct slow_work_ops cifs_oplock_break_ops;

  
  #endif	/* _CIFS_GLOB_H */