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TOMOYO Linux Cross Reference
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 #include <uapi/linux/cifs/cifs_mount.h>
 32 #ifdef CONFIG_CIFS_SMB2
 33 #include "smb2pdu.h"
 34 #endif
 35 
 36 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
 37 
 38 /*
 39  * The sizes of various internal tables and strings
 40  */
 41 #define MAX_UID_INFO 16
 42 #define MAX_SES_INFO 2
 43 #define MAX_TCON_INFO 4
 44 
 45 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
 46 
 47 #define CIFS_MIN_RCV_POOL 4
 48 
 49 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
 50 /*
 51  * default attribute cache timeout (jiffies)
 52  */
 53 #define CIFS_DEF_ACTIMEO (1 * HZ)
 54 
 55 /*
 56  * max attribute cache timeout (jiffies) - 2^30
 57  */
 58 #define CIFS_MAX_ACTIMEO (1 << 30)
 59 
 60 /*
 61  * MAX_REQ is the maximum number of requests that WE will send
 62  * on one socket concurrently.
 63  */
 64 #define CIFS_MAX_REQ 32767
 65 
 66 #define RFC1001_NAME_LEN 15
 67 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
 68 
 69 /* currently length of NIP6_FMT */
 70 #define SERVER_NAME_LENGTH 40
 71 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
 72 
 73 /* echo interval in seconds */
 74 #define SMB_ECHO_INTERVAL_MIN 1
 75 #define SMB_ECHO_INTERVAL_MAX 600
 76 #define SMB_ECHO_INTERVAL_DEFAULT 60
 77 
 78 /*
 79  * Default number of credits to keep available for SMB3.
 80  * This value is chosen somewhat arbitrarily. The Windows client
 81  * defaults to 128 credits, the Windows server allows clients up to
 82  * 512 credits (or 8K for later versions), and the NetApp server
 83  * does not limit clients at all.  Choose a high enough default value
 84  * such that the client shouldn't limit performance, but allow mount
 85  * to override (until you approach 64K, where we limit credits to 65000
 86  * to reduce possibility of seeing more server credit overflow bugs.
 87  */
 88 #define SMB2_MAX_CREDITS_AVAILABLE 32000
 89 
 90 #include "cifspdu.h"
 91 
 92 #ifndef XATTR_DOS_ATTRIB
 93 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
 94 #endif
 95 
 96 /*
 97  * CIFS vfs client Status information (based on what we know.)
 98  */
 99 
100 /* associated with each tcp and smb session */
101 enum statusEnum {
102         CifsNew = 0,
103         CifsGood,
104         CifsExiting,
105         CifsNeedReconnect,
106         CifsNeedNegotiate
107 };
108 
109 enum securityEnum {
110         Unspecified = 0,        /* not specified */
111         LANMAN,                 /* Legacy LANMAN auth */
112         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
113         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
114         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
115         Kerberos,               /* Kerberos via SPNEGO */
116 };
117 
118 struct session_key {
119         unsigned int len;
120         char *response;
121 };
122 
123 /* crypto security descriptor definition */
124 struct sdesc {
125         struct shash_desc shash;
126         char ctx[];
127 };
128 
129 /* crypto hashing related structure/fields, not specific to a sec mech */
130 struct cifs_secmech {
131         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
132         struct crypto_shash *md5; /* md5 hash function */
133         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
134         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
135         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
136         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
137         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
138         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
139         struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
140         struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
141 };
142 
143 /* per smb session structure/fields */
144 struct ntlmssp_auth {
145         bool sesskey_per_smbsess; /* whether session key is per smb session */
146         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
147         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
148         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
149         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
150 };
151 
152 struct cifs_cred {
153         int uid;
154         int gid;
155         int mode;
156         int cecount;
157         struct cifs_sid osid;
158         struct cifs_sid gsid;
159         struct cifs_ntace *ntaces;
160         struct cifs_ace *aces;
161 };
162 
163 /*
164  *****************************************************************
165  * Except the CIFS PDUs themselves all the
166  * globally interesting structs should go here
167  *****************************************************************
168  */
169 
170 /*
171  * A smb_rqst represents a complete request to be issued to a server. It's
172  * formed by a kvec array, followed by an array of pages. Page data is assumed
173  * to start at the beginning of the first page.
174  */
175 struct smb_rqst {
176         struct kvec     *rq_iov;        /* array of kvecs */
177         unsigned int    rq_nvec;        /* number of kvecs in array */
178         struct page     **rq_pages;     /* pointer to array of page ptrs */
179         unsigned int    rq_npages;      /* number pages in array */
180         unsigned int    rq_pagesz;      /* page size to use */
181         unsigned int    rq_tailsz;      /* length of last page */
182 };
183 
184 enum smb_version {
185         Smb_1 = 1,
186         Smb_20,
187         Smb_21,
188         Smb_30,
189         Smb_302,
190 #ifdef CONFIG_CIFS_SMB311
191         Smb_311,
192 #endif /* SMB311 */
193         Smb_version_err
194 };
195 
196 struct mid_q_entry;
197 struct TCP_Server_Info;
198 struct cifsFileInfo;
199 struct cifs_ses;
200 struct cifs_tcon;
201 struct dfs_info3_param;
202 struct cifs_fattr;
203 struct smb_vol;
204 struct cifs_fid;
205 struct cifs_readdata;
206 struct cifs_writedata;
207 struct cifs_io_parms;
208 struct cifs_search_info;
209 struct cifsInodeInfo;
210 struct cifs_open_parms;
211 
212 struct smb_version_operations {
213         int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
214                            struct mid_q_entry *);
215         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
216         /* setup request: allocate mid, sign message */
217         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
218                                                 struct smb_rqst *);
219         /* setup async request: allocate mid, sign message */
220         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
221                                                 struct smb_rqst *);
222         /* check response: verify signature, map error */
223         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
224                              bool);
225         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
226                             const int);
227         void (*set_credits)(struct TCP_Server_Info *, const int);
228         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
229         unsigned int (*get_credits)(struct mid_q_entry *);
230         __u64 (*get_next_mid)(struct TCP_Server_Info *);
231         /* data offset from read response message */
232         unsigned int (*read_data_offset)(char *);
233         /* data length from read response message */
234         unsigned int (*read_data_length)(char *);
235         /* map smb to linux error */
236         int (*map_error)(char *, bool);
237         /* find mid corresponding to the response message */
238         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
239         void (*dump_detail)(void *);
240         void (*clear_stats)(struct cifs_tcon *);
241         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
242         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
243         /* verify the message */
244         int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
245         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
246         int (*handle_cancelled_mid)(char *, struct TCP_Server_Info *);
247         void (*downgrade_oplock)(struct TCP_Server_Info *,
248                                         struct cifsInodeInfo *, bool);
249         /* process transaction2 response */
250         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
251                              char *, int);
252         /* check if we need to negotiate */
253         bool (*need_neg)(struct TCP_Server_Info *);
254         /* negotiate to the server */
255         int (*negotiate)(const unsigned int, struct cifs_ses *);
256         /* set negotiated write size */
257         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
258         /* set negotiated read size */
259         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
260         /* setup smb sessionn */
261         int (*sess_setup)(const unsigned int, struct cifs_ses *,
262                           const struct nls_table *);
263         /* close smb session */
264         int (*logoff)(const unsigned int, struct cifs_ses *);
265         /* connect to a server share */
266         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
267                             struct cifs_tcon *, const struct nls_table *);
268         /* close tree connecion */
269         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
270         /* get DFS referrals */
271         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
272                              const char *, struct dfs_info3_param **,
273                              unsigned int *, const struct nls_table *, int);
274         /* informational QFS call */
275         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
276         /* check if a path is accessible or not */
277         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
278                                   struct cifs_sb_info *, const char *);
279         /* query path data from the server */
280         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
281                                struct cifs_sb_info *, const char *,
282                                FILE_ALL_INFO *, bool *, bool *);
283         /* query file data from the server */
284         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
285                                struct cifs_fid *, FILE_ALL_INFO *);
286         /* get server index number */
287         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
288                             struct cifs_sb_info *, const char *,
289                             u64 *uniqueid, FILE_ALL_INFO *);
290         /* set size by path */
291         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
292                              const char *, __u64, struct cifs_sb_info *, bool);
293         /* set size by file handle */
294         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
295                              struct cifsFileInfo *, __u64, bool);
296         /* set attributes */
297         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
298                              const unsigned int);
299         int (*set_compression)(const unsigned int, struct cifs_tcon *,
300                                struct cifsFileInfo *);
301         /* check if we can send an echo or nor */
302         bool (*can_echo)(struct TCP_Server_Info *);
303         /* send echo request */
304         int (*echo)(struct TCP_Server_Info *);
305         /* create directory */
306         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
307                      struct cifs_sb_info *);
308         /* set info on created directory */
309         void (*mkdir_setinfo)(struct inode *, const char *,
310                               struct cifs_sb_info *, struct cifs_tcon *,
311                               const unsigned int);
312         /* remove directory */
313         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
314                      struct cifs_sb_info *);
315         /* unlink file */
316         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
317                       struct cifs_sb_info *);
318         /* open, rename and delete file */
319         int (*rename_pending_delete)(const char *, struct dentry *,
320                                      const unsigned int);
321         /* send rename request */
322         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
323                       const char *, struct cifs_sb_info *);
324         /* send create hardlink request */
325         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
326                                const char *, const char *,
327                                struct cifs_sb_info *);
328         /* query symlink target */
329         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
330                              const char *, char **, struct cifs_sb_info *);
331         /* open a file for non-posix mounts */
332         int (*open)(const unsigned int, struct cifs_open_parms *,
333                     __u32 *, FILE_ALL_INFO *);
334         /* set fid protocol-specific info */
335         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
336         /* close a file */
337         void (*close)(const unsigned int, struct cifs_tcon *,
338                       struct cifs_fid *);
339         /* send a flush request to the server */
340         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
341         /* async read from the server */
342         int (*async_readv)(struct cifs_readdata *);
343         /* async write to the server */
344         int (*async_writev)(struct cifs_writedata *,
345                             void (*release)(struct kref *));
346         /* sync read from the server */
347         int (*sync_read)(const unsigned int, struct cifs_fid *,
348                          struct cifs_io_parms *, unsigned int *, char **,
349                          int *);
350         /* sync write to the server */
351         int (*sync_write)(const unsigned int, struct cifs_fid *,
352                           struct cifs_io_parms *, unsigned int *, struct kvec *,
353                           unsigned long);
354         /* open dir, start readdir */
355         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
356                                const char *, struct cifs_sb_info *,
357                                struct cifs_fid *, __u16,
358                                struct cifs_search_info *);
359         /* continue readdir */
360         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
361                               struct cifs_fid *,
362                               __u16, struct cifs_search_info *srch_inf);
363         /* close dir */
364         int (*close_dir)(const unsigned int, struct cifs_tcon *,
365                          struct cifs_fid *);
366         /* calculate a size of SMB message */
367         unsigned int (*calc_smb_size)(void *);
368         /* check for STATUS_PENDING and process it in a positive case */
369         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
370         /* check for STATUS_NETWORK_SESSION_EXPIRED */
371         bool (*is_session_expired)(char *);
372         /* send oplock break response */
373         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
374                                struct cifsInodeInfo *);
375         /* query remote filesystem */
376         int (*queryfs)(const unsigned int, struct cifs_tcon *,
377                        struct kstatfs *);
378         /* send mandatory brlock to the server */
379         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
380                          __u64, __u32, int, int, bool);
381         /* unlock range of mandatory locks */
382         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
383                                  const unsigned int);
384         /* push brlocks from the cache to the server */
385         int (*push_mand_locks)(struct cifsFileInfo *);
386         /* get lease key of the inode */
387         void (*get_lease_key)(struct inode *, struct cifs_fid *);
388         /* set lease key of the inode */
389         void (*set_lease_key)(struct inode *, struct cifs_fid *);
390         /* generate new lease key */
391         void (*new_lease_key)(struct cifs_fid *);
392         int (*generate_signingkey)(struct cifs_ses *);
393         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
394         int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
395                              struct cifsFileInfo *src_file);
396         int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
397                              struct cifsFileInfo *src_file, void __user *);
398         int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
399                                 struct cifs_sb_info *, const unsigned char *,
400                                 char *, unsigned int *);
401         int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
402                                  struct cifs_sb_info *, const unsigned char *,
403                                  char *, unsigned int *);
404         /* if we can do cache read operations */
405         bool (*is_read_op)(__u32);
406         /* set oplock level for the inode */
407         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
408                                  bool *);
409         /* create lease context buffer for CREATE request */
410         char * (*create_lease_buf)(u8 *, u8);
411         /* parse lease context buffer and return oplock/epoch info */
412         __u8 (*parse_lease_buf)(void *, unsigned int *);
413         ssize_t (*copychunk_range)(const unsigned int,
414                         struct cifsFileInfo *src_file,
415                         struct cifsFileInfo *target_file,
416                         u64 src_off, u64 len, u64 dest_off);
417         int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
418                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
419                         u64 dest_off);
420         int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
421         ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
422                         const unsigned char *, const unsigned char *, char *,
423                         size_t, struct cifs_sb_info *);
424         int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
425                         const char *, const void *, const __u16,
426                         const struct nls_table *, int);
427         struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
428                         const char *, u32 *);
429         struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
430                         const struct cifs_fid *, u32 *);
431         int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
432                         int);
433         /* writepages retry size */
434         unsigned int (*wp_retry_size)(struct inode *);
435         /* get mtu credits */
436         int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
437                                 unsigned int *, unsigned int *);
438         /* check if we need to issue closedir */
439         bool (*dir_needs_close)(struct cifsFileInfo *);
440         long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
441                           loff_t);
442         /* init transform request - used for encryption for now */
443         int (*init_transform_rq)(struct TCP_Server_Info *, struct smb_rqst *,
444                                  struct smb_rqst *);
445         /* free transform request */
446         void (*free_transform_rq)(struct smb_rqst *);
447         int (*is_transform_hdr)(void *buf);
448         int (*receive_transform)(struct TCP_Server_Info *,
449                                  struct mid_q_entry **);
450         enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
451                             enum securityEnum);
452 
453 };
454 
455 struct smb_version_values {
456         char            *version_string;
457         __u16           protocol_id;
458         __u32           req_capabilities;
459         __u32           large_lock_type;
460         __u32           exclusive_lock_type;
461         __u32           shared_lock_type;
462         __u32           unlock_lock_type;
463         size_t          header_size;
464         size_t          max_header_size;
465         size_t          read_rsp_size;
466         __le16          lock_cmd;
467         unsigned int    cap_unix;
468         unsigned int    cap_nt_find;
469         unsigned int    cap_large_files;
470         __u16           signing_enabled;
471         __u16           signing_required;
472         size_t          create_lease_size;
473 };
474 
475 #define HEADER_SIZE(server) (server->vals->header_size)
476 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
477 
478 struct smb_vol {
479         char *username;
480         char *password;
481         char *domainname;
482         char *UNC;
483         char *iocharset;  /* local code page for mapping to and from Unicode */
484         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
485         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
486         kuid_t cred_uid;
487         kuid_t linux_uid;
488         kgid_t linux_gid;
489         kuid_t backupuid;
490         kgid_t backupgid;
491         umode_t file_mode;
492         umode_t dir_mode;
493         enum securityEnum sectype; /* sectype requested via mnt opts */
494         bool sign; /* was signing requested via mnt opts? */
495         bool retry:1;
496         bool intr:1;
497         bool setuids:1;
498         bool setuidfromacl:1;
499         bool override_uid:1;
500         bool override_gid:1;
501         bool dynperm:1;
502         bool noperm:1;
503         bool no_psx_acl:1; /* set if posix acl support should be disabled */
504         bool cifs_acl:1;
505         bool backupuid_specified; /* mount option  backupuid  is specified */
506         bool backupgid_specified; /* mount option  backupgid  is specified */
507         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
508         bool server_ino:1; /* use inode numbers from server ie UniqueId */
509         bool direct_io:1;
510         bool strict_io:1; /* strict cache behavior */
511         bool remap:1;      /* set to remap seven reserved chars in filenames */
512         bool sfu_remap:1;  /* remap seven reserved chars ala SFU */
513         bool posix_paths:1; /* unset to not ask for posix pathnames. */
514         bool no_linux_ext:1;
515         bool sfu_emul:1;
516         bool nullauth:1;   /* attempt to authenticate with null user */
517         bool nocase:1;     /* request case insensitive filenames */
518         bool nobrl:1;      /* disable sending byte range locks to srv */
519         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
520         bool seal:1;       /* request transport encryption on share */
521         bool nodfs:1;      /* Do not request DFS, even if available */
522         bool local_lease:1; /* check leases only on local system, not remote */
523         bool noblocksnd:1;
524         bool noautotune:1;
525         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
526         bool fsc:1;     /* enable fscache */
527         bool mfsymlinks:1; /* use Minshall+French Symlinks */
528         bool multiuser:1;
529         bool rwpidforward:1; /* pid forward for read/write operations */
530         bool nosharesock:1;
531         bool persistent:1;
532         bool nopersistent:1;
533         bool resilient:1; /* noresilient not required since not fored for CA */
534         bool domainauto:1;
535         unsigned int rsize;
536         unsigned int wsize;
537         bool sockopt_tcp_nodelay:1;
538         unsigned long actimeo; /* attribute cache timeout (jiffies) */
539         struct smb_version_operations *ops;
540         struct smb_version_values *vals;
541         char *prepath;
542         struct sockaddr_storage dstaddr; /* destination address */
543         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
544         struct nls_table *local_nls;
545         unsigned int echo_interval; /* echo interval in secs */
546         __u64 snapshot_time; /* needed for timewarp tokens */
547         unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
548 };
549 
550 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
551                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
552                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
553                          CIFS_MOUNT_MAP_SFM_CHR | \
554                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
555                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
556                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
557                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
558                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
559                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
560                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
561 
562 #define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
563                       MS_NODEV | MS_SYNCHRONOUS)
564 
565 struct cifs_mnt_data {
566         struct cifs_sb_info *cifs_sb;
567         struct smb_vol *vol;
568         int flags;
569 };
570 
571 static inline unsigned int
572 get_rfc1002_length(void *buf)
573 {
574         return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
575 }
576 
577 static inline void
578 inc_rfc1001_len(void *buf, int count)
579 {
580         be32_add_cpu((__be32 *)buf, count);
581 }
582 
583 struct TCP_Server_Info {
584         struct list_head tcp_ses_list;
585         struct list_head smb_ses_list;
586         int srv_count; /* reference counter */
587         /* 15 character server name + 0x20 16th byte indicating type = srv */
588         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
589         struct smb_version_operations   *ops;
590         struct smb_version_values       *vals;
591         enum statusEnum tcpStatus; /* what we think the status is */
592         char *hostname; /* hostname portion of UNC string */
593         struct socket *ssocket;
594         struct sockaddr_storage dstaddr;
595         struct sockaddr_storage srcaddr; /* locally bind to this IP */
596 #ifdef CONFIG_NET_NS
597         struct net *net;
598 #endif
599         wait_queue_head_t response_q;
600         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
601         struct list_head pending_mid_q;
602         bool noblocksnd;                /* use blocking sendmsg */
603         bool noautotune;                /* do not autotune send buf sizes */
604         bool tcp_nodelay;
605         unsigned int credits;  /* send no more requests at once */
606         unsigned int max_credits; /* can override large 32000 default at mnt */
607         unsigned int in_flight;  /* number of requests on the wire to server */
608         spinlock_t req_lock;  /* protect the two values above */
609         struct mutex srv_mutex;
610         struct task_struct *tsk;
611         char server_GUID[16];
612         __u16 sec_mode;
613         bool sign; /* is signing enabled on this connection? */
614         bool session_estab; /* mark when very first sess is established */
615 #ifdef CONFIG_CIFS_SMB2
616         int echo_credits;  /* echo reserved slots */
617         int oplock_credits;  /* oplock break reserved slots */
618         bool echoes:1; /* enable echoes */
619         __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
620 #endif
621         u16 dialect; /* dialect index that server chose */
622         bool oplocks:1; /* enable oplocks */
623         unsigned int maxReq;    /* Clients should submit no more */
624         /* than maxReq distinct unanswered SMBs to the server when using  */
625         /* multiplexed reads or writes */
626         unsigned int maxBuf;    /* maxBuf specifies the maximum */
627         /* message size the server can send or receive for non-raw SMBs */
628         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
629         /* when socket is setup (and during reconnect) before NegProt sent */
630         unsigned int max_rw;    /* maxRw specifies the maximum */
631         /* message size the server can send or receive for */
632         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
633         unsigned int capabilities; /* selective disabling of caps by smb sess */
634         int timeAdj;  /* Adjust for difference in server time zone in sec */
635         __u64 CurrentMid;         /* multiplex id - rotating counter */
636         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
637         /* 16th byte of RFC1001 workstation name is always null */
638         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
639         __u32 sequence_number; /* for signing, protected by srv_mutex */
640         struct session_key session_key;
641         unsigned long lstrp; /* when we got last response from this server */
642         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
643 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
644 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
645 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
646         char    negflavor;      /* NEGOTIATE response flavor */
647         /* extended security flavors that server supports */
648         bool    sec_ntlmssp;            /* supports NTLMSSP */
649         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
650         bool    sec_kerberos;           /* supports plain Kerberos */
651         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
652         bool    large_buf;              /* is current buffer large? */
653         struct delayed_work     echo; /* echo ping workqueue job */
654         char    *smallbuf;      /* pointer to current "small" buffer */
655         char    *bigbuf;        /* pointer to current "big" buffer */
656         unsigned int total_read; /* total amount of data read in this pass */
657 #ifdef CONFIG_CIFS_FSCACHE
658         struct fscache_cookie   *fscache; /* client index cache cookie */
659 #endif
660 #ifdef CONFIG_CIFS_STATS2
661         atomic_t in_send; /* requests trying to send */
662         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
663 #endif
664 #ifdef CONFIG_CIFS_SMB2
665         unsigned int    max_read;
666         unsigned int    max_write;
667         __u8            preauth_hash[512];
668         struct delayed_work reconnect; /* reconnect workqueue job */
669         struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
670 #endif /* CONFIG_CIFS_SMB2 */
671         unsigned long echo_interval;
672 };
673 
674 static inline unsigned int
675 in_flight(struct TCP_Server_Info *server)
676 {
677         unsigned int num;
678         spin_lock(&server->req_lock);
679         num = server->in_flight;
680         spin_unlock(&server->req_lock);
681         return num;
682 }
683 
684 static inline bool
685 has_credits(struct TCP_Server_Info *server, int *credits)
686 {
687         int num;
688         spin_lock(&server->req_lock);
689         num = *credits;
690         spin_unlock(&server->req_lock);
691         return num > 0;
692 }
693 
694 static inline void
695 add_credits(struct TCP_Server_Info *server, const unsigned int add,
696             const int optype)
697 {
698         server->ops->add_credits(server, add, optype);
699 }
700 
701 static inline void
702 add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,
703                         const int optype)
704 {
705         if (add) {
706                 server->ops->add_credits(server, add, optype);
707                 wake_up(&server->request_q);
708         }
709 }
710 
711 static inline void
712 set_credits(struct TCP_Server_Info *server, const int val)
713 {
714         server->ops->set_credits(server, val);
715 }
716 
717 static inline __le64
718 get_next_mid64(struct TCP_Server_Info *server)
719 {
720         return cpu_to_le64(server->ops->get_next_mid(server));
721 }
722 
723 static inline __le16
724 get_next_mid(struct TCP_Server_Info *server)
725 {
726         __u16 mid = server->ops->get_next_mid(server);
727         /*
728          * The value in the SMB header should be little endian for easy
729          * on-the-wire decoding.
730          */
731         return cpu_to_le16(mid);
732 }
733 
734 static inline __u16
735 get_mid(const struct smb_hdr *smb)
736 {
737         return le16_to_cpu(smb->Mid);
738 }
739 
740 static inline bool
741 compare_mid(__u16 mid, const struct smb_hdr *smb)
742 {
743         return mid == le16_to_cpu(smb->Mid);
744 }
745 
746 /*
747  * When the server supports very large reads and writes via POSIX extensions,
748  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
749  * including the RFC1001 length.
750  *
751  * Note that this might make for "interesting" allocation problems during
752  * writeback however as we have to allocate an array of pointers for the
753  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
754  *
755  * For reads, there is a similar problem as we need to allocate an array
756  * of kvecs to handle the receive, though that should only need to be done
757  * once.
758  */
759 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
760 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
761 
762 /*
763  * When the server doesn't allow large posix writes, only allow a rsize/wsize
764  * of 2^17-1 minus the size of the call header. That allows for a read or
765  * write up to the maximum size described by RFC1002.
766  */
767 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
768 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
769 
770 /*
771  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
772  * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
773  * a single wsize request with a single call.
774  */
775 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
776 
777 /*
778  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
779  * those values when posix extensions aren't in force. In actuality here, we
780  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
781  * to be ok with the extra byte even though Windows doesn't send writes that
782  * are that large.
783  *
784  * Citation:
785  *
786  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
787  */
788 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
789 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
790 
791 /*
792  * Macros to allow the TCP_Server_Info->net field and related code to drop out
793  * when CONFIG_NET_NS isn't set.
794  */
795 
796 #ifdef CONFIG_NET_NS
797 
798 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
799 {
800         return srv->net;
801 }
802 
803 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
804 {
805         srv->net = net;
806 }
807 
808 #else
809 
810 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
811 {
812         return &init_net;
813 }
814 
815 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
816 {
817 }
818 
819 #endif
820 
821 /*
822  * Session structure.  One of these for each uid session with a particular host
823  */
824 struct cifs_ses {
825         struct list_head smb_ses_list;
826         struct list_head tcon_list;
827         struct mutex session_mutex;
828         struct TCP_Server_Info *server; /* pointer to server info */
829         int ses_count;          /* reference counter */
830         enum statusEnum status;
831         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
832         __u32 ipc_tid;          /* special tid for connection to IPC share */
833         char *serverOS;         /* name of operating system underlying server */
834         char *serverNOS;        /* name of network operating system of server */
835         char *serverDomain;     /* security realm of server */
836         __u64 Suid;             /* remote smb uid  */
837         kuid_t linux_uid;       /* overriding owner of files on the mount */
838         kuid_t cred_uid;        /* owner of credentials */
839         unsigned int capabilities;
840         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
841                                 TCP names - will ipv6 and sctp addresses fit? */
842         char *user_name;        /* must not be null except during init of sess
843                                    and after mount option parsing we fill it */
844         char *domainName;
845         char *password;
846         struct session_key auth_key;
847         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
848         enum securityEnum sectype; /* what security flavor was specified? */
849         bool sign;              /* is signing required? */
850         bool need_reconnect:1; /* connection reset, uid now invalid */
851         bool domainAuto:1;
852 #ifdef CONFIG_CIFS_SMB2
853         __u16 session_flags;
854         __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
855         __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
856         __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
857         __u8 preauth_hash[512];
858 #endif /* CONFIG_CIFS_SMB2 */
859 };
860 
861 static inline bool
862 cap_unix(struct cifs_ses *ses)
863 {
864         return ses->server->vals->cap_unix & ses->capabilities;
865 }
866 
867 /*
868  * there is one of these for each connection to a resource on a particular
869  * session
870  */
871 struct cifs_tcon {
872         struct list_head tcon_list;
873         int tc_count;
874         struct list_head rlist; /* reconnect list */
875         struct list_head openFileList;
876         spinlock_t open_file_lock; /* protects list above */
877         struct cifs_ses *ses;   /* pointer to session associated with */
878         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
879         char *nativeFileSystem;
880         char *password;         /* for share-level security */
881         __u32 tid;              /* The 4 byte tree id */
882         __u16 Flags;            /* optional support bits */
883         enum statusEnum tidStatus;
884 #ifdef CONFIG_CIFS_STATS
885         atomic_t num_smbs_sent;
886         union {
887                 struct {
888                         atomic_t num_writes;
889                         atomic_t num_reads;
890                         atomic_t num_flushes;
891                         atomic_t num_oplock_brks;
892                         atomic_t num_opens;
893                         atomic_t num_closes;
894                         atomic_t num_deletes;
895                         atomic_t num_mkdirs;
896                         atomic_t num_posixopens;
897                         atomic_t num_posixmkdirs;
898                         atomic_t num_rmdirs;
899                         atomic_t num_renames;
900                         atomic_t num_t2renames;
901                         atomic_t num_ffirst;
902                         atomic_t num_fnext;
903                         atomic_t num_fclose;
904                         atomic_t num_hardlinks;
905                         atomic_t num_symlinks;
906                         atomic_t num_locks;
907                         atomic_t num_acl_get;
908                         atomic_t num_acl_set;
909                 } cifs_stats;
910 #ifdef CONFIG_CIFS_SMB2
911                 struct {
912                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
913                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
914                 } smb2_stats;
915 #endif /* CONFIG_CIFS_SMB2 */
916         } stats;
917 #ifdef CONFIG_CIFS_STATS2
918         unsigned long long time_writes;
919         unsigned long long time_reads;
920         unsigned long long time_opens;
921         unsigned long long time_deletes;
922         unsigned long long time_closes;
923         unsigned long long time_mkdirs;
924         unsigned long long time_rmdirs;
925         unsigned long long time_renames;
926         unsigned long long time_t2renames;
927         unsigned long long time_ffirst;
928         unsigned long long time_fnext;
929         unsigned long long time_fclose;
930 #endif /* CONFIG_CIFS_STATS2 */
931         __u64    bytes_read;
932         __u64    bytes_written;
933         spinlock_t stat_lock;  /* protects the two fields above */
934 #endif /* CONFIG_CIFS_STATS */
935         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
936         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
937         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
938         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
939         bool retry:1;
940         bool nocase:1;
941         bool seal:1;      /* transport encryption for this mounted share */
942         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
943                                 for this mount even if server would support */
944         bool local_lease:1; /* check leases (only) on local system not remote */
945         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
946         bool broken_sparse_sup; /* if server or share does not support sparse */
947         bool need_reconnect:1; /* connection reset, tid now invalid */
948         bool need_reopen_files:1; /* need to reopen tcon file handles */
949         bool use_resilient:1; /* use resilient instead of durable handles */
950         bool use_persistent:1; /* use persistent instead of durable handles */
951 #ifdef CONFIG_CIFS_SMB2
952         bool print:1;           /* set if connection to printer share */
953         __le32 capabilities;
954         __u32 share_flags;
955         __u32 maximal_access;
956         __u32 vol_serial_number;
957         __le64 vol_create_time;
958         __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
959         __u32 ss_flags;         /* sector size flags */
960         __u32 perf_sector_size; /* best sector size for perf */
961         __u32 max_chunks;
962         __u32 max_bytes_chunk;
963         __u32 max_bytes_copy;
964 #endif /* CONFIG_CIFS_SMB2 */
965 #ifdef CONFIG_CIFS_FSCACHE
966         u64 resource_id;                /* server resource id */
967         struct fscache_cookie *fscache; /* cookie for share */
968 #endif
969         struct list_head pending_opens; /* list of incomplete opens */
970         /* BB add field for back pointer to sb struct(s)? */
971 };
972 
973 /*
974  * This is a refcounted and timestamped container for a tcon pointer. The
975  * container holds a tcon reference. It is considered safe to free one of
976  * these when the tl_count goes to 0. The tl_time is the time of the last
977  * "get" on the container.
978  */
979 struct tcon_link {
980         struct rb_node          tl_rbnode;
981         kuid_t                  tl_uid;
982         unsigned long           tl_flags;
983 #define TCON_LINK_MASTER        0
984 #define TCON_LINK_PENDING       1
985 #define TCON_LINK_IN_TREE       2
986         unsigned long           tl_time;
987         atomic_t                tl_count;
988         struct cifs_tcon        *tl_tcon;
989 };
990 
991 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
992 
993 static inline struct cifs_tcon *
994 tlink_tcon(struct tcon_link *tlink)
995 {
996         return tlink->tl_tcon;
997 }
998 
999 extern void cifs_put_tlink(struct tcon_link *tlink);
1000 
1001 static inline struct tcon_link *
1002 cifs_get_tlink(struct tcon_link *tlink)
1003 {
1004         if (tlink && !IS_ERR(tlink))
1005                 atomic_inc(&tlink->tl_count);
1006         return tlink;
1007 }
1008 
1009 /* This function is always expected to succeed */
1010 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1011 
1012 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1013 
1014 struct cifs_pending_open {
1015         struct list_head olist;
1016         struct tcon_link *tlink;
1017         __u8 lease_key[16];
1018         __u32 oplock;
1019 };
1020 
1021 /*
1022  * This info hangs off the cifsFileInfo structure, pointed to by llist.
1023  * This is used to track byte stream locks on the file
1024  */
1025 struct cifsLockInfo {
1026         struct list_head llist; /* pointer to next cifsLockInfo */
1027         struct list_head blist; /* pointer to locks blocked on this */
1028         wait_queue_head_t block_q;
1029         __u64 offset;
1030         __u64 length;
1031         __u32 pid;
1032         __u32 type;
1033 };
1034 
1035 /*
1036  * One of these for each open instance of a file
1037  */
1038 struct cifs_search_info {
1039         loff_t index_of_last_entry;
1040         __u16 entries_in_buffer;
1041         __u16 info_level;
1042         __u32 resume_key;
1043         char *ntwrk_buf_start;
1044         char *srch_entries_start;
1045         char *last_entry;
1046         const char *presume_name;
1047         unsigned int resume_name_len;
1048         bool endOfSearch:1;
1049         bool emptyDir:1;
1050         bool unicode:1;
1051         bool smallBuf:1; /* so we know which buf_release function to call */
1052 };
1053 
1054 struct cifs_open_parms {
1055         struct cifs_tcon *tcon;
1056         struct cifs_sb_info *cifs_sb;
1057         int disposition;
1058         int desired_access;
1059         int create_options;
1060         const char *path;
1061         struct cifs_fid *fid;
1062         bool reconnect:1;
1063 };
1064 
1065 struct cifs_fid {
1066         __u16 netfid;
1067 #ifdef CONFIG_CIFS_SMB2
1068         __u64 persistent_fid;   /* persist file id for smb2 */
1069         __u64 volatile_fid;     /* volatile file id for smb2 */
1070         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
1071         __u8 create_guid[16];
1072 #endif
1073         struct cifs_pending_open *pending_open;
1074         unsigned int epoch;
1075         bool purge_cache;
1076 };
1077 
1078 struct cifs_fid_locks {
1079         struct list_head llist;
1080         struct cifsFileInfo *cfile;     /* fid that owns locks */
1081         struct list_head locks;         /* locks held by fid above */
1082 };
1083 
1084 struct cifsFileInfo {
1085         /* following two lists are protected by tcon->open_file_lock */
1086         struct list_head tlist; /* pointer to next fid owned by tcon */
1087         struct list_head flist; /* next fid (file instance) for this inode */
1088         /* lock list below protected by cifsi->lock_sem */
1089         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
1090         kuid_t uid;             /* allows finding which FileInfo structure */
1091         __u32 pid;              /* process id who opened file */
1092         struct cifs_fid fid;    /* file id from remote */
1093         struct list_head rlist; /* reconnect list */
1094         /* BB add lock scope info here if needed */ ;
1095         /* lock scope id (0 if none) */
1096         struct dentry *dentry;
1097         struct tcon_link *tlink;
1098         unsigned int f_flags;
1099         bool invalidHandle:1;   /* file closed via session abend */
1100         bool oplock_break_cancelled:1;
1101         int count;
1102         spinlock_t file_info_lock; /* protects four flag/count fields above */
1103         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1104         struct cifs_search_info srch_inf;
1105         struct work_struct oplock_break; /* work for oplock breaks */
1106 };
1107 
1108 struct cifs_io_parms {
1109         __u16 netfid;
1110 #ifdef CONFIG_CIFS_SMB2
1111         __u64 persistent_fid;   /* persist file id for smb2 */
1112         __u64 volatile_fid;     /* volatile file id for smb2 */
1113 #endif
1114         __u32 pid;
1115         __u64 offset;
1116         unsigned int length;
1117         struct cifs_tcon *tcon;
1118 };
1119 
1120 struct cifs_aio_ctx {
1121         struct kref             refcount;
1122         struct list_head        list;
1123         struct mutex            aio_mutex;
1124         struct completion       done;
1125         struct iov_iter         iter;
1126         struct kiocb            *iocb;
1127         struct cifsFileInfo     *cfile;
1128         struct bio_vec          *bv;
1129         loff_t                  pos;
1130         unsigned int            npages;
1131         ssize_t                 rc;
1132         unsigned int            len;
1133         unsigned int            total_len;
1134         bool                    should_dirty;
1135 };
1136 
1137 struct cifs_readdata;
1138 
1139 /* asynchronous read support */
1140 struct cifs_readdata {
1141         struct kref                     refcount;
1142         struct list_head                list;
1143         struct completion               done;
1144         struct cifsFileInfo             *cfile;
1145         struct address_space            *mapping;
1146         struct cifs_aio_ctx             *ctx;
1147         __u64                           offset;
1148         unsigned int                    bytes;
1149         unsigned int                    got_bytes;
1150         pid_t                           pid;
1151         int                             result;
1152         struct work_struct              work;
1153         int (*read_into_pages)(struct TCP_Server_Info *server,
1154                                 struct cifs_readdata *rdata,
1155                                 unsigned int len);
1156         int (*copy_into_pages)(struct TCP_Server_Info *server,
1157                                 struct cifs_readdata *rdata,
1158                                 struct iov_iter *iter);
1159         struct kvec                     iov[2];
1160         unsigned int                    pagesz;
1161         unsigned int                    tailsz;
1162         unsigned int                    credits;
1163         unsigned int                    nr_pages;
1164         struct page                     *pages[];
1165 };
1166 
1167 struct cifs_writedata;
1168 
1169 /* asynchronous write support */
1170 struct cifs_writedata {
1171         struct kref                     refcount;
1172         struct list_head                list;
1173         struct completion               done;
1174         enum writeback_sync_modes       sync_mode;
1175         struct work_struct              work;
1176         struct cifsFileInfo             *cfile;
1177         struct cifs_aio_ctx             *ctx;
1178         __u64                           offset;
1179         pid_t                           pid;
1180         unsigned int                    bytes;
1181         int                             result;
1182         unsigned int                    pagesz;
1183         unsigned int                    tailsz;
1184         unsigned int                    credits;
1185         unsigned int                    nr_pages;
1186         struct page                     *pages[];
1187 };
1188 
1189 /*
1190  * Take a reference on the file private data. Must be called with
1191  * cfile->file_info_lock held.
1192  */
1193 static inline void
1194 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1195 {
1196         ++cifs_file->count;
1197 }
1198 
1199 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1200 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1201 
1202 #define CIFS_CACHE_READ_FLG     1
1203 #define CIFS_CACHE_HANDLE_FLG   2
1204 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1205 #define CIFS_CACHE_WRITE_FLG    4
1206 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1207 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1208 
1209 #define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
1210 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1211 #define CIFS_CACHE_WRITE(cinode) (cinode->oplock & CIFS_CACHE_WRITE_FLG)
1212 
1213 /*
1214  * One of these for each file inode
1215  */
1216 
1217 struct cifsInodeInfo {
1218         bool can_cache_brlcks;
1219         struct list_head llist; /* locks helb by this inode */
1220         struct rw_semaphore lock_sem;   /* protect the fields above */
1221         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1222         struct list_head openFileList;
1223         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1224         unsigned int oplock;            /* oplock/lease level we have */
1225         unsigned int epoch;             /* used to track lease state changes */
1226 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1227 #define CIFS_INODE_PENDING_WRITERS        (1) /* Writes in progress */
1228 #define CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 (2) /* Downgrade oplock to L2 */
1229 #define CIFS_INO_DELETE_PENDING           (3) /* delete pending on server */
1230 #define CIFS_INO_INVALID_MAPPING          (4) /* pagecache is invalid */
1231 #define CIFS_INO_LOCK                     (5) /* lock bit for synchronization */
1232         unsigned long flags;
1233         spinlock_t writers_lock;
1234         unsigned int writers;           /* Number of writers on this inode */
1235         unsigned long time;             /* jiffies of last update of inode */
1236         u64  server_eof;                /* current file size on server -- protected by i_lock */
1237         u64  uniqueid;                  /* server inode number */
1238         u64  createtime;                /* creation time on server */
1239 #ifdef CONFIG_CIFS_SMB2
1240         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1241 #endif
1242 #ifdef CONFIG_CIFS_FSCACHE
1243         struct fscache_cookie *fscache;
1244 #endif
1245         struct inode vfs_inode;
1246 };
1247 
1248 static inline struct cifsInodeInfo *
1249 CIFS_I(struct inode *inode)
1250 {
1251         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1252 }
1253 
1254 static inline struct cifs_sb_info *
1255 CIFS_SB(struct super_block *sb)
1256 {
1257         return sb->s_fs_info;
1258 }
1259 
1260 static inline struct cifs_sb_info *
1261 CIFS_FILE_SB(struct file *file)
1262 {
1263         return CIFS_SB(file_inode(file)->i_sb);
1264 }
1265 
1266 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1267 {
1268         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1269                 return '/';
1270         else
1271                 return '\\';
1272 }
1273 
1274 static inline void
1275 convert_delimiter(char *path, char delim)
1276 {
1277         char old_delim, *pos;
1278 
1279         if (delim == '/')
1280                 old_delim = '\\';
1281         else
1282                 old_delim = '/';
1283 
1284         pos = path;
1285         while ((pos = strchr(pos, old_delim)))
1286                 *pos = delim;
1287 }
1288 
1289 #ifdef CONFIG_CIFS_STATS
1290 #define cifs_stats_inc atomic_inc
1291 
1292 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1293                                             unsigned int bytes)
1294 {
1295         if (bytes) {
1296                 spin_lock(&tcon->stat_lock);
1297                 tcon->bytes_written += bytes;
1298                 spin_unlock(&tcon->stat_lock);
1299         }
1300 }
1301 
1302 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1303                                          unsigned int bytes)
1304 {
1305         spin_lock(&tcon->stat_lock);
1306         tcon->bytes_read += bytes;
1307         spin_unlock(&tcon->stat_lock);
1308 }
1309 #else
1310 
1311 #define  cifs_stats_inc(field) do {} while (0)
1312 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1313 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1314 
1315 #endif
1316 
1317 
1318 /*
1319  * This is the prototype for the mid receive function. This function is for
1320  * receiving the rest of the SMB frame, starting with the WordCount (which is
1321  * just after the MID in struct smb_hdr). Note:
1322  *
1323  * - This will be called by cifsd, with no locks held.
1324  * - The mid will still be on the pending_mid_q.
1325  * - mid->resp_buf will point to the current buffer.
1326  *
1327  * Returns zero on a successful receive, or an error. The receive state in
1328  * the TCP_Server_Info will also be updated.
1329  */
1330 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1331                             struct mid_q_entry *mid);
1332 
1333 /*
1334  * This is the prototype for the mid callback function. This is called once the
1335  * mid has been received off of the socket. When creating one, take special
1336  * care to avoid deadlocks. Things to bear in mind:
1337  *
1338  * - it will be called by cifsd, with no locks held
1339  * - the mid will be removed from any lists
1340  */
1341 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1342 
1343 /*
1344  * This is the protopyte for mid handle function. This is called once the mid
1345  * has been recognized after decryption of the message.
1346  */
1347 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1348                             struct mid_q_entry *mid);
1349 
1350 /* one of these for every pending CIFS request to the server */
1351 struct mid_q_entry {
1352         struct list_head qhead; /* mids waiting on reply from this server */
1353         struct TCP_Server_Info *server; /* server corresponding to this mid */
1354         __u64 mid;              /* multiplex id */
1355         __u32 pid;              /* process id */
1356         __u32 sequence_number;  /* for CIFS signing */
1357         unsigned long when_alloc;  /* when mid was created */
1358 #ifdef CONFIG_CIFS_STATS2
1359         unsigned long when_sent; /* time when smb send finished */
1360         unsigned long when_received; /* when demux complete (taken off wire) */
1361 #endif
1362         mid_receive_t *receive; /* call receive callback */
1363         mid_callback_t *callback; /* call completion callback */
1364         mid_handle_t *handle; /* call handle mid callback */
1365         void *callback_data;      /* general purpose pointer for callback */
1366         void *resp_buf;         /* pointer to received SMB header */
1367         int mid_state;  /* wish this were enum but can not pass to wait_event */
1368         unsigned int mid_flags;
1369         __le16 command;         /* smb command code */
1370         bool large_buf:1;       /* if valid response, is pointer to large buf */
1371         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1372         bool multiEnd:1;        /* both received */
1373         bool decrypted:1;       /* decrypted entry */
1374 };
1375 
1376 struct close_cancelled_open {
1377         struct cifs_fid         fid;
1378         struct cifs_tcon        *tcon;
1379         struct work_struct      work;
1380 };
1381 
1382 /*      Make code in transport.c a little cleaner by moving
1383         update of optional stats into function below */
1384 #ifdef CONFIG_CIFS_STATS2
1385 
1386 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1387 {
1388         atomic_inc(&server->in_send);
1389 }
1390 
1391 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1392 {
1393         atomic_dec(&server->in_send);
1394 }
1395 
1396 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1397 {
1398         atomic_inc(&server->num_waiters);
1399 }
1400 
1401 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1402 {
1403         atomic_dec(&server->num_waiters);
1404 }
1405 
1406 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1407 {
1408         mid->when_sent = jiffies;
1409 }
1410 #else
1411 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1412 {
1413 }
1414 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1415 {
1416 }
1417 
1418 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1419 {
1420 }
1421 
1422 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1423 {
1424 }
1425 
1426 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1427 {
1428 }
1429 #endif
1430 
1431 /* for pending dnotify requests */
1432 struct dir_notify_req {
1433         struct list_head lhead;
1434         __le16 Pid;
1435         __le16 PidHigh;
1436         __u16 Mid;
1437         __u16 Tid;
1438         __u16 Uid;
1439         __u16 netfid;
1440         __u32 filter; /* CompletionFilter (for multishot) */
1441         int multishot;
1442         struct file *pfile;
1443 };
1444 
1445 struct dfs_info3_param {
1446         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1447         int path_consumed;
1448         int server_type;
1449         int ref_flag;
1450         char *path_name;
1451         char *node_name;
1452 };
1453 
1454 /*
1455  * common struct for holding inode info when searching for or updating an
1456  * inode with new info
1457  */
1458 
1459 #define CIFS_FATTR_DFS_REFERRAL         0x1
1460 #define CIFS_FATTR_DELETE_PENDING       0x2
1461 #define CIFS_FATTR_NEED_REVAL           0x4
1462 #define CIFS_FATTR_INO_COLLISION        0x8
1463 #define CIFS_FATTR_UNKNOWN_NLINK        0x10
1464 
1465 struct cifs_fattr {
1466         u32             cf_flags;
1467         u32             cf_cifsattrs;
1468         u64             cf_uniqueid;
1469         u64             cf_eof;
1470         u64             cf_bytes;
1471         u64             cf_createtime;
1472         kuid_t          cf_uid;
1473         kgid_t          cf_gid;
1474         umode_t         cf_mode;
1475         dev_t           cf_rdev;
1476         unsigned int    cf_nlink;
1477         unsigned int    cf_dtype;
1478         struct timespec cf_atime;
1479         struct timespec cf_mtime;
1480         struct timespec cf_ctime;
1481 };
1482 
1483 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1484 {
1485         if (param) {
1486                 kfree(param->path_name);
1487                 kfree(param->node_name);
1488                 kfree(param);
1489         }
1490 }
1491 
1492 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1493                                        int number_of_items)
1494 {
1495         int i;
1496         if ((number_of_items == 0) || (param == NULL))
1497                 return;
1498         for (i = 0; i < number_of_items; i++) {
1499                 kfree(param[i].path_name);
1500                 kfree(param[i].node_name);
1501         }
1502         kfree(param);
1503 }
1504 
1505 #define   MID_FREE 0
1506 #define   MID_REQUEST_ALLOCATED 1
1507 #define   MID_REQUEST_SUBMITTED 2
1508 #define   MID_RESPONSE_RECEIVED 4
1509 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1510 #define   MID_RESPONSE_MALFORMED 0x10
1511 #define   MID_SHUTDOWN           0x20
1512 
1513 /* Flags */
1514 #define   MID_WAIT_CANCELLED     1 /* Cancelled while waiting for response */
1515 
1516 /* Types of response buffer returned from SendReceive2 */
1517 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1518 #define   CIFS_SMALL_BUFFER     1
1519 #define   CIFS_LARGE_BUFFER     2
1520 #define   CIFS_IOVEC            4    /* array of response buffers */
1521 
1522 /* Type of Request to SendReceive2 */
1523 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1524 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1525 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1526 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1527 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1528 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1529 
1530 /* Type of request operation */
1531 #define   CIFS_ECHO_OP      0x080    /* echo request */
1532 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1533 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1534 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1535 
1536 #define   CIFS_HAS_CREDITS 0x0400    /* already has credits */
1537 #define   CIFS_TRANSFORM_REQ 0x0800    /* transform request before sending */
1538 
1539 /* Security Flags: indicate type of session setup needed */
1540 #define   CIFSSEC_MAY_SIGN      0x00001
1541 #define   CIFSSEC_MAY_NTLM      0x00002
1542 #define   CIFSSEC_MAY_NTLMV2    0x00004
1543 #define   CIFSSEC_MAY_KRB5      0x00008
1544 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1545 #define   CIFSSEC_MAY_LANMAN    0x00010
1546 #define   CIFSSEC_MAY_PLNTXT    0x00020
1547 #else
1548 #define   CIFSSEC_MAY_LANMAN    0
1549 #define   CIFSSEC_MAY_PLNTXT    0
1550 #endif /* weak passwords */
1551 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1552 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1553 
1554 #define   CIFSSEC_MUST_SIGN     0x01001
1555 /* note that only one of the following can be set so the
1556 result of setting MUST flags more than once will be to
1557 require use of the stronger protocol */
1558 #define   CIFSSEC_MUST_NTLM     0x02002
1559 #define   CIFSSEC_MUST_NTLMV2   0x04004
1560 #define   CIFSSEC_MUST_KRB5     0x08008
1561 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1562 #define   CIFSSEC_MUST_LANMAN   0x10010
1563 #define   CIFSSEC_MUST_PLNTXT   0x20020
1564 #ifdef CONFIG_CIFS_UPCALL
1565 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1566 #else
1567 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1568 #endif /* UPCALL */
1569 #else /* do not allow weak pw hash */
1570 #define   CIFSSEC_MUST_LANMAN   0
1571 #define   CIFSSEC_MUST_PLNTXT   0
1572 #ifdef CONFIG_CIFS_UPCALL
1573 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1574 #else
1575 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1576 #endif /* UPCALL */
1577 #endif /* WEAK_PW_HASH */
1578 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1579 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1580 
1581 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1582 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1583 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1584 /*
1585  *****************************************************************
1586  * All constants go here
1587  *****************************************************************
1588  */
1589 
1590 #define UID_HASH (16)
1591 
1592 /*
1593  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1594  * following to be declared.
1595  */
1596 
1597 /****************************************************************************
1598  *  Locking notes.  All updates to global variables and lists should be
1599  *                  protected by spinlocks or semaphores.
1600  *
1601  *  Spinlocks
1602  *  ---------
1603  *  GlobalMid_Lock protects:
1604  *      list operations on pending_mid_q and oplockQ
1605  *      updates to XID counters, multiplex id  and SMB sequence numbers
1606  *  tcp_ses_lock protects:
1607  *      list operations on tcp and SMB session lists
1608  *  tcon->open_file_lock protects the list of open files hanging off the tcon
1609  *  cfile->file_info_lock protects counters and fields in cifs file struct
1610  *  f_owner.lock protects certain per file struct operations
1611  *  mapping->page_lock protects certain per page operations
1612  *
1613  *  Semaphores
1614  *  ----------
1615  *  sesSem     operations on smb session
1616  *  tconSem    operations on tree connection
1617  *  fh_sem      file handle reconnection operations
1618  *
1619  ****************************************************************************/
1620 
1621 #ifdef DECLARE_GLOBALS_HERE
1622 #define GLOBAL_EXTERN
1623 #else
1624 #define GLOBAL_EXTERN extern
1625 #endif
1626 
1627 /*
1628  * the list of TCP_Server_Info structures, ie each of the sockets
1629  * connecting our client to a distinct server (ip address), is
1630  * chained together by cifs_tcp_ses_list. The list of all our SMB
1631  * sessions (and from that the tree connections) can be found
1632  * by iterating over cifs_tcp_ses_list
1633  */
1634 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1635 
1636 /*
1637  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1638  * tcp session, and the list of tcon's per smb session. It also protects
1639  * the reference counters for the server, smb session, and tcon. Finally,
1640  * changes to the tcon->tidStatus should be done while holding this lock.
1641  * generally the locks should be taken in order tcp_ses_lock before
1642  * tcon->open_file_lock and that before file->file_info_lock since the
1643  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1644  */
1645 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1646 
1647 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1648 /* Outstanding dir notify requests */
1649 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1650 /* DirNotify response queue */
1651 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1652 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1653 
1654 /*
1655  * Global transaction id (XID) information
1656  */
1657 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1658 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1659 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1660 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1661                                           /* on midQ entries */
1662 /*
1663  *  Global counters, updated atomically
1664  */
1665 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1666 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1667 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1668 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1669 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1670 
1671 /* Various Debug counters */
1672 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1673 #ifdef CONFIG_CIFS_STATS2
1674 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1675 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1676 #endif
1677 GLOBAL_EXTERN atomic_t smBufAllocCount;
1678 GLOBAL_EXTERN atomic_t midCount;
1679 
1680 /* Misc globals */
1681 GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1682 GLOBAL_EXTERN bool lookupCacheEnabled;
1683 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1684                                 with more secure ntlmssp2 challenge/resp */
1685 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1686 GLOBAL_EXTERN bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1687 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1688 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1689 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1690 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1691 
1692 #ifdef CONFIG_CIFS_ACL
1693 GLOBAL_EXTERN struct rb_root uidtree;
1694 GLOBAL_EXTERN struct rb_root gidtree;
1695 GLOBAL_EXTERN spinlock_t siduidlock;
1696 GLOBAL_EXTERN spinlock_t sidgidlock;
1697 GLOBAL_EXTERN struct rb_root siduidtree;
1698 GLOBAL_EXTERN struct rb_root sidgidtree;
1699 GLOBAL_EXTERN spinlock_t uidsidlock;
1700 GLOBAL_EXTERN spinlock_t gidsidlock;
1701 #endif /* CONFIG_CIFS_ACL */
1702 
1703 void cifs_oplock_break(struct work_struct *work);
1704 
1705 extern const struct slow_work_ops cifs_oplock_break_ops;
1706 extern struct workqueue_struct *cifsiod_wq;
1707 extern struct workqueue_struct *cifsoplockd_wq;
1708 extern __u32 cifs_lock_secret;
1709 
1710 extern mempool_t *cifs_mid_poolp;
1711 
1712 /* Operations for different SMB versions */
1713 #define SMB1_VERSION_STRING     "1.0"
1714 extern struct smb_version_operations smb1_operations;
1715 extern struct smb_version_values smb1_values;
1716 #define SMB20_VERSION_STRING    "2.0"
1717 extern struct smb_version_operations smb20_operations;
1718 extern struct smb_version_values smb20_values;
1719 #define SMB21_VERSION_STRING    "2.1"
1720 extern struct smb_version_operations smb21_operations;
1721 extern struct smb_version_values smb21_values;
1722 #define SMB30_VERSION_STRING    "3.0"
1723 extern struct smb_version_operations smb30_operations;
1724 extern struct smb_version_values smb30_values;
1725 #define SMB302_VERSION_STRING   "3.02"
1726 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1727 extern struct smb_version_values smb302_values;
1728 #define SMB311_VERSION_STRING   "3.1.1"
1729 #define ALT_SMB311_VERSION_STRING "3.11"
1730 extern struct smb_version_operations smb311_operations;
1731 extern struct smb_version_values smb311_values;
1732 #endif  /* _CIFS_GLOB_H */
1733 

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