4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org)
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.
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.
23 #include <linux/in6.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include "cifs_fs_sb.h"
28 #include <crypto/internal/hash.h>
29 #include <linux/scatterlist.h>
32 * The sizes of various internal tables and strings
34 #define MAX_UID_INFO 16
35 #define MAX_SES_INFO 2
36 #define MAX_TCON_INFO 4
38 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
39 #define MAX_SERVER_SIZE 15
40 #define MAX_SHARE_SIZE 64 /* used to be 20, this should still be enough */
41 #define MAX_USERNAME_SIZE 32 /* 32 is to allow for 15 char names + null
42 termination then *2 for unicode versions */
43 #define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */
45 #define CIFS_MIN_RCV_POOL 4
48 * MAX_REQ is the maximum number of requests that WE will send
49 * on one socket concurrently. It also matches the most common
50 * value of max multiplex returned by servers. We may
51 * eventually want to use the negotiated value (in case
52 * future servers can handle more) when we are more confident that
53 * we will not have problems oveloading the socket with pending
56 #define CIFS_MAX_REQ 50
58 #define RFC1001_NAME_LEN 15
59 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
61 /* currently length of NIP6_FMT */
62 #define SERVER_NAME_LENGTH 40
63 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
65 /* used to define string lengths for reversing unicode strings */
67 /* (max path length + 1 for null) * 2 for unicode */
72 #ifndef XATTR_DOS_ATTRIB
73 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
77 * CIFS vfs client Status information (based on what we know.)
80 /* associated with each tcp and smb session */
89 LANMAN = 0, /* Legacy LANMAN auth */
90 NTLM, /* Legacy NTLM012 auth with NTLM hash */
91 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
92 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
93 /* NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
94 Kerberos, /* Kerberos via SPNEGO */
100 /* Netbios frames protocol not supported at this time */
108 /* crypto security descriptor definition */
110 struct shash_desc shash;
114 /* crypto hashing related structure/fields, not speicific to a sec mech */
115 struct cifs_secmech {
116 struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
117 struct crypto_shash *md5; /* md5 hash function */
118 struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
119 struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
122 /* per smb connection structure/fields */
123 struct ntlmssp_auth {
124 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
125 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
126 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
134 struct cifs_sid osid;
135 struct cifs_sid gsid;
136 struct cifs_ntace *ntaces;
137 struct cifs_ace *aces;
141 *****************************************************************
142 * Except the CIFS PDUs themselves all the
143 * globally interesting structs should go here
144 *****************************************************************
147 struct TCP_Server_Info {
148 struct list_head tcp_ses_list;
149 struct list_head smb_ses_list;
150 int srv_count; /* reference counter */
151 /* 15 character server name + 0x20 16th byte indicating type = srv */
152 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
153 char *hostname; /* hostname portion of UNC string */
154 struct socket *ssocket;
156 struct sockaddr_in sockAddr;
157 struct sockaddr_in6 sockAddr6;
159 struct sockaddr_storage srcaddr; /* locally bind to this IP */
160 wait_queue_head_t response_q;
161 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
162 struct list_head pending_mid_q;
163 void *Server_NlsInfo; /* BB - placeholder for future NLS info */
164 unsigned short server_codepage; /* codepage for the server */
165 enum protocolEnum protocolType;
168 bool svlocal:1; /* local server or remote */
169 bool noblocksnd; /* use blocking sendmsg */
170 bool noautotune; /* do not autotune send buf sizes */
172 atomic_t inFlight; /* number of requests on the wire to server */
173 #ifdef CONFIG_CIFS_STATS2
174 atomic_t inSend; /* requests trying to send */
175 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
177 enum statusEnum tcpStatus; /* what we think the status is */
178 struct mutex srv_mutex;
179 struct task_struct *tsk;
180 char server_GUID[16];
182 enum securityEnum secType;
183 unsigned int maxReq; /* Clients should submit no more */
184 /* than maxReq distinct unanswered SMBs to the server when using */
185 /* multiplexed reads or writes */
186 unsigned int maxBuf; /* maxBuf specifies the maximum */
187 /* message size the server can send or receive for non-raw SMBs */
188 unsigned int max_rw; /* maxRw specifies the maximum */
189 /* message size the server can send or receive for */
190 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
191 unsigned int max_vcs; /* maximum number of smb sessions, at least
192 those that can be specified uniquely with
194 char sessid[4]; /* unique token id for this session */
195 /* (returned on Negotiate */
196 int capabilities; /* allow selective disabling of caps by smb sess */
197 int timeAdj; /* Adjust for difference in server time zone in sec */
198 __u16 CurrentMid; /* multiplex id - rotating counter */
199 /* 16th byte of RFC1001 workstation name is always null */
200 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
201 __u32 sequence_number; /* needed for CIFS PDU signature */
202 struct session_key session_key;
203 unsigned long lstrp; /* when we got last response from this server */
204 u16 dialect; /* dialect index that server chose */
205 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
206 /* extended security flavors that server supports */
207 bool sec_kerberos; /* supports plain Kerberos */
208 bool sec_mskerberos; /* supports legacy MS Kerberos */
209 bool sec_kerberosu2u; /* supports U2U Kerberos */
210 bool sec_ntlmssp; /* supports NTLMSSP */
211 bool session_estab; /* mark when very first sess is established */
212 #ifdef CONFIG_CIFS_FSCACHE
213 struct fscache_cookie *fscache; /* client index cache cookie */
218 * Session structure. One of these for each uid session with a particular host
221 struct list_head smb_ses_list;
222 struct list_head tcon_list;
223 struct mutex session_mutex;
224 struct TCP_Server_Info *server; /* pointer to server info */
225 int ses_count; /* reference counter */
226 enum statusEnum status;
227 unsigned overrideSecFlg; /* if non-zero override global sec flags */
228 __u16 ipc_tid; /* special tid for connection to IPC share */
231 char *serverOS; /* name of operating system underlying server */
232 char *serverNOS; /* name of network operating system of server */
233 char *serverDomain; /* security realm of server */
234 int Suid; /* remote smb uid */
235 uid_t linux_uid; /* overriding owner of files on the mount */
236 uid_t cred_uid; /* owner of credentials */
238 char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
239 TCP names - will ipv6 and sctp addresses fit? */
240 char userName[MAX_USERNAME_SIZE + 1];
243 char cryptKey[CIFS_CRYPTO_KEY_SIZE];
244 struct session_key auth_key;
245 char ntlmv2_hash[16];
246 unsigned int tilen; /* length of the target info blob */
247 unsigned char *tiblob; /* target info blob in challenge response */
248 struct ntlmssp_auth ntlmssp; /* ciphertext, flags */
249 bool need_reconnect:1; /* connection reset, uid now invalid */
251 /* no more than one of the following three session flags may be set */
252 #define CIFS_SES_NT4 1
253 #define CIFS_SES_OS2 2
254 #define CIFS_SES_W9X 4
255 /* following flag is set for old servers such as OS2 (and Win95?)
256 which do not negotiate NTLM or POSIX dialects, but instead
257 negotiate one of the older LANMAN dialects */
258 #define CIFS_SES_LANMAN 8
260 * there is one of these for each connection to a resource on a particular
263 struct cifsTconInfo {
264 struct list_head tcon_list;
266 struct list_head openFileList;
267 struct cifsSesInfo *ses; /* pointer to session associated with */
268 char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
269 char *nativeFileSystem;
270 char *password; /* for share-level security */
271 __u16 tid; /* The 2 byte tree id */
272 __u16 Flags; /* optional support bits */
273 enum statusEnum tidStatus;
274 #ifdef CONFIG_CIFS_STATS
275 atomic_t num_smbs_sent;
278 atomic_t num_flushes;
279 atomic_t num_oplock_brks;
282 atomic_t num_deletes;
284 atomic_t num_posixopens;
285 atomic_t num_posixmkdirs;
287 atomic_t num_renames;
288 atomic_t num_t2renames;
292 atomic_t num_hardlinks;
293 atomic_t num_symlinks;
295 atomic_t num_acl_get;
296 atomic_t num_acl_set;
297 #ifdef CONFIG_CIFS_STATS2
298 unsigned long long time_writes;
299 unsigned long long time_reads;
300 unsigned long long time_opens;
301 unsigned long long time_deletes;
302 unsigned long long time_closes;
303 unsigned long long time_mkdirs;
304 unsigned long long time_rmdirs;
305 unsigned long long time_renames;
306 unsigned long long time_t2renames;
307 unsigned long long time_ffirst;
308 unsigned long long time_fnext;
309 unsigned long long time_fclose;
310 #endif /* CONFIG_CIFS_STATS2 */
313 spinlock_t stat_lock;
314 #endif /* CONFIG_CIFS_STATS */
315 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
316 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
317 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
318 bool ipc:1; /* set if connection to IPC$ eg for RPC/PIPES */
321 bool seal:1; /* transport encryption for this mounted share */
322 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
323 for this mount even if server would support */
324 bool local_lease:1; /* check leases (only) on local system not remote */
325 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
326 bool need_reconnect:1; /* connection reset, tid now invalid */
327 #ifdef CONFIG_CIFS_FSCACHE
328 u64 resource_id; /* server resource id */
329 struct fscache_cookie *fscache; /* cookie for share */
331 /* BB add field for back pointer to sb struct(s)? */
335 * This is a refcounted and timestamped container for a tcon pointer. The
336 * container holds a tcon reference. It is considered safe to free one of
337 * these when the tl_count goes to 0. The tl_time is the time of the last
338 * "get" on the container.
341 unsigned long tl_index;
342 unsigned long tl_flags;
343 #define TCON_LINK_MASTER 0
344 #define TCON_LINK_PENDING 1
345 #define TCON_LINK_IN_TREE 2
346 unsigned long tl_time;
348 struct cifsTconInfo *tl_tcon;
351 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
353 static inline struct cifsTconInfo *
354 tlink_tcon(struct tcon_link *tlink)
356 return tlink->tl_tcon;
359 extern void cifs_put_tlink(struct tcon_link *tlink);
361 static inline struct tcon_link *
362 cifs_get_tlink(struct tcon_link *tlink)
364 if (tlink && !IS_ERR(tlink))
365 atomic_inc(&tlink->tl_count);
369 /* This function is always expected to succeed */
370 extern struct cifsTconInfo *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
373 * This info hangs off the cifsFileInfo structure, pointed to by llist.
374 * This is used to track byte stream locks on the file
376 struct cifsLockInfo {
377 struct list_head llist; /* pointer to next cifsLockInfo */
384 * One of these for each open instance of a file
386 struct cifs_search_info {
387 loff_t index_of_last_entry;
388 __u16 entries_in_buffer;
391 char *ntwrk_buf_start;
392 char *srch_entries_start;
395 unsigned int resume_name_len;
399 bool smallBuf:1; /* so we know which buf_release function to call */
402 struct cifsFileInfo {
403 struct list_head tlist; /* pointer to next fid owned by tcon */
404 struct list_head flist; /* next fid (file instance) for this inode */
405 unsigned int uid; /* allows finding which FileInfo structure */
406 __u32 pid; /* process id who opened file */
407 __u16 netfid; /* file id from remote */
408 /* BB add lock scope info here if needed */ ;
409 /* lock scope id (0 if none) */
410 struct dentry *dentry;
411 unsigned int f_flags;
412 struct tcon_link *tlink;
413 struct mutex lock_mutex;
414 struct list_head llist; /* list of byte range locks we have. */
415 bool invalidHandle:1; /* file closed via session abend */
416 bool oplock_break_cancelled:1;
417 int count; /* refcount protected by cifs_file_list_lock */
418 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
419 struct cifs_search_info srch_inf;
420 struct work_struct oplock_break; /* work for oplock breaks */
424 * Take a reference on the file private data. Must be called with
425 * cifs_file_list_lock held.
427 static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
432 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
435 * One of these for each file inode
438 struct cifsInodeInfo {
439 struct list_head lockList;
440 /* BB add in lists for dirty pages i.e. write caching info for oplock */
441 struct list_head openFileList;
442 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
443 unsigned long time; /* jiffies of last update/check of inode */
444 bool clientCanCacheRead:1; /* read oplock */
445 bool clientCanCacheAll:1; /* read and writebehind oplock */
446 bool delete_pending:1; /* DELETE_ON_CLOSE is set */
447 bool invalid_mapping:1; /* pagecache is invalid */
448 u64 server_eof; /* current file size on server */
449 u64 uniqueid; /* server inode number */
450 #ifdef CONFIG_CIFS_FSCACHE
451 struct fscache_cookie *fscache;
453 struct inode vfs_inode;
456 static inline struct cifsInodeInfo *
457 CIFS_I(struct inode *inode)
459 return container_of(inode, struct cifsInodeInfo, vfs_inode);
462 static inline struct cifs_sb_info *
463 CIFS_SB(struct super_block *sb)
465 return sb->s_fs_info;
468 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
476 #ifdef CONFIG_CIFS_STATS
477 #define cifs_stats_inc atomic_inc
479 static inline void cifs_stats_bytes_written(struct cifsTconInfo *tcon,
483 spin_lock(&tcon->stat_lock);
484 tcon->bytes_written += bytes;
485 spin_unlock(&tcon->stat_lock);
489 static inline void cifs_stats_bytes_read(struct cifsTconInfo *tcon,
492 spin_lock(&tcon->stat_lock);
493 tcon->bytes_read += bytes;
494 spin_unlock(&tcon->stat_lock);
498 #define cifs_stats_inc(field) do {} while (0)
499 #define cifs_stats_bytes_written(tcon, bytes) do {} while (0)
500 #define cifs_stats_bytes_read(tcon, bytes) do {} while (0)
504 /* one of these for every pending CIFS request to the server */
506 struct list_head qhead; /* mids waiting on reply from this server */
507 __u16 mid; /* multiplex id */
508 __u16 pid; /* process id */
509 __u32 sequence_number; /* for CIFS signing */
510 unsigned long when_alloc; /* when mid was created */
511 #ifdef CONFIG_CIFS_STATS2
512 unsigned long when_sent; /* time when smb send finished */
513 unsigned long when_received; /* when demux complete (taken off wire) */
515 struct task_struct *tsk; /* task waiting for response */
516 struct smb_hdr *resp_buf; /* response buffer */
517 int midState; /* wish this were enum but can not pass to wait_event */
518 __u8 command; /* smb command code */
519 bool largeBuf:1; /* if valid response, is pointer to large buf */
520 bool multiRsp:1; /* multiple trans2 responses for one request */
521 bool multiEnd:1; /* both received */
524 struct oplock_q_entry {
525 struct list_head qhead;
526 struct inode *pinode;
527 struct cifsTconInfo *tcon;
531 /* for pending dnotify requests */
532 struct dir_notify_req {
533 struct list_head lhead;
540 __u32 filter; /* CompletionFilter (for multishot) */
545 struct dfs_info3_param {
546 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
555 * common struct for holding inode info when searching for or updating an
556 * inode with new info
559 #define CIFS_FATTR_DFS_REFERRAL 0x1
560 #define CIFS_FATTR_DELETE_PENDING 0x2
561 #define CIFS_FATTR_NEED_REVAL 0x4
562 #define CIFS_FATTR_INO_COLLISION 0x8
574 unsigned int cf_nlink;
575 unsigned int cf_dtype;
576 struct timespec cf_atime;
577 struct timespec cf_mtime;
578 struct timespec cf_ctime;
581 static inline void free_dfs_info_param(struct dfs_info3_param *param)
584 kfree(param->path_name);
585 kfree(param->node_name);
590 static inline void free_dfs_info_array(struct dfs_info3_param *param,
594 if ((number_of_items == 0) || (param == NULL))
596 for (i = 0; i < number_of_items; i++) {
597 kfree(param[i].path_name);
598 kfree(param[i].node_name);
604 #define MID_REQUEST_ALLOCATED 1
605 #define MID_REQUEST_SUBMITTED 2
606 #define MID_RESPONSE_RECEIVED 4
607 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
608 #define MID_NO_RESP_NEEDED 0x10
610 /* Types of response buffer returned from SendReceive2 */
611 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
612 #define CIFS_SMALL_BUFFER 1
613 #define CIFS_LARGE_BUFFER 2
614 #define CIFS_IOVEC 4 /* array of response buffers */
616 /* Type of Request to SendReceive2 */
617 #define CIFS_STD_OP 0 /* normal request timeout */
618 #define CIFS_LONG_OP 1 /* long op (up to 45 sec, oplock time) */
619 #define CIFS_VLONG_OP 2 /* sloow op - can take up to 180 seconds */
620 #define CIFS_BLOCKING_OP 4 /* operation can block */
621 #define CIFS_ASYNC_OP 8 /* do not wait for response */
622 #define CIFS_TIMEOUT_MASK 0x00F /* only one of 5 above set in req */
623 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
624 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
625 #define CIFS_NO_RESP 0x040 /* no response buffer required */
627 /* Security Flags: indicate type of session setup needed */
628 #define CIFSSEC_MAY_SIGN 0x00001
629 #define CIFSSEC_MAY_NTLM 0x00002
630 #define CIFSSEC_MAY_NTLMV2 0x00004
631 #define CIFSSEC_MAY_KRB5 0x00008
632 #ifdef CONFIG_CIFS_WEAK_PW_HASH
633 #define CIFSSEC_MAY_LANMAN 0x00010
634 #define CIFSSEC_MAY_PLNTXT 0x00020
636 #define CIFSSEC_MAY_LANMAN 0
637 #define CIFSSEC_MAY_PLNTXT 0
638 #endif /* weak passwords */
639 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
640 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
642 #define CIFSSEC_MUST_SIGN 0x01001
643 /* note that only one of the following can be set so the
644 result of setting MUST flags more than once will be to
645 require use of the stronger protocol */
646 #define CIFSSEC_MUST_NTLM 0x02002
647 #define CIFSSEC_MUST_NTLMV2 0x04004
648 #define CIFSSEC_MUST_KRB5 0x08008
649 #ifdef CONFIG_CIFS_WEAK_PW_HASH
650 #define CIFSSEC_MUST_LANMAN 0x10010
651 #define CIFSSEC_MUST_PLNTXT 0x20020
652 #ifdef CONFIG_CIFS_UPCALL
653 #define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
655 #define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
657 #else /* do not allow weak pw hash */
658 #ifdef CONFIG_CIFS_UPCALL
659 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
661 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
663 #endif /* WEAK_PW_HASH */
664 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
665 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
667 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2)
668 #define CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
669 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
671 *****************************************************************
672 * All constants go here
673 *****************************************************************
676 #define UID_HASH (16)
679 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
680 * following to be declared.
683 /****************************************************************************
684 * Locking notes. All updates to global variables and lists should be
685 * protected by spinlocks or semaphores.
689 * GlobalMid_Lock protects:
690 * list operations on pending_mid_q and oplockQ
691 * updates to XID counters, multiplex id and SMB sequence numbers
692 * cifs_file_list_lock protects:
693 * list operations on tcp and SMB session lists and tCon lists
694 * f_owner.lock protects certain per file struct operations
695 * mapping->page_lock protects certain per page operations
699 * sesSem operations on smb session
700 * tconSem operations on tree connection
701 * fh_sem file handle reconnection operations
703 ****************************************************************************/
705 #ifdef DECLARE_GLOBALS_HERE
706 #define GLOBAL_EXTERN
708 #define GLOBAL_EXTERN extern
712 * the list of TCP_Server_Info structures, ie each of the sockets
713 * connecting our client to a distinct server (ip address), is
714 * chained together by cifs_tcp_ses_list. The list of all our SMB
715 * sessions (and from that the tree connections) can be found
716 * by iterating over cifs_tcp_ses_list
718 GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
721 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
722 * tcp session, and the list of tcon's per smb session. It also protects
723 * the reference counters for the server, smb session, and tcon. Finally,
724 * changes to the tcon->tidStatus should be done while holding this lock.
726 GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
729 * This lock protects the cifs_file->llist and cifs_file->flist
730 * list operations, and updates to some flags (cifs_file->invalidHandle)
731 * It will be moved to either use the tcon->stat_lock or equivalent later.
732 * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
733 * the cifs_tcp_ses_lock must be grabbed first and released last.
735 GLOBAL_EXTERN spinlock_t cifs_file_list_lock;
737 /* Outstanding dir notify requests */
738 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
739 /* DirNotify response queue */
740 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
743 * Global transaction id (XID) information
745 GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
746 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
747 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
748 GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
749 /* on midQ entries */
750 GLOBAL_EXTERN char Local_System_Name[15];
753 * Global counters, updated atomically
755 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
756 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
757 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
758 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
759 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
761 /* Various Debug counters */
762 GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
763 #ifdef CONFIG_CIFS_STATS2
764 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
765 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
767 GLOBAL_EXTERN atomic_t smBufAllocCount;
768 GLOBAL_EXTERN atomic_t midCount;
771 GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
772 to be established on existing mount if we
773 have the uid/password or Kerberos credential
774 or equivalent for current user */
775 GLOBAL_EXTERN unsigned int oplockEnabled;
776 GLOBAL_EXTERN unsigned int experimEnabled;
777 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
778 GLOBAL_EXTERN unsigned int global_secflags; /* if on, session setup sent
779 with more secure ntlmssp2 challenge/resp */
780 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
781 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
782 GLOBAL_EXTERN unsigned int CIFSMaxBufSize; /* max size not including hdr */
783 GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
784 GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */
785 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
787 void cifs_oplock_break(struct work_struct *work);
788 void cifs_oplock_break_get(struct cifsFileInfo *cfile);
789 void cifs_oplock_break_put(struct cifsFileInfo *cfile);
791 extern const struct slow_work_ops cifs_oplock_break_ops;
793 #endif /* _CIFS_GLOB_H */