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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 #include "smb2pdu.h"
 33 
 34 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
 35 
 36 /*
 37  * The sizes of various internal tables and strings
 38  */
 39 #define MAX_UID_INFO 16
 40 #define MAX_SES_INFO 2
 41 #define MAX_TCON_INFO 4
 42 
 43 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
 44 
 45 #define CIFS_MIN_RCV_POOL 4
 46 
 47 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
 48 /*
 49  * default attribute cache timeout (jiffies)
 50  */
 51 #define CIFS_DEF_ACTIMEO (1 * HZ)
 52 
 53 /*
 54  * max attribute cache timeout (jiffies) - 2^30
 55  */
 56 #define CIFS_MAX_ACTIMEO (1 << 30)
 57 
 58 /*
 59  * MAX_REQ is the maximum number of requests that WE will send
 60  * on one socket concurrently.
 61  */
 62 #define CIFS_MAX_REQ 32767
 63 
 64 #define RFC1001_NAME_LEN 15
 65 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
 66 
 67 /* maximum length of ip addr as a string (including ipv6 and sctp) */
 68 #define SERVER_NAME_LENGTH 80
 69 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
 70 
 71 /* echo interval in seconds */
 72 #define SMB_ECHO_INTERVAL_MIN 1
 73 #define SMB_ECHO_INTERVAL_MAX 600
 74 #define SMB_ECHO_INTERVAL_DEFAULT 60
 75 
 76 /*
 77  * Default number of credits to keep available for SMB3.
 78  * This value is chosen somewhat arbitrarily. The Windows client
 79  * defaults to 128 credits, the Windows server allows clients up to
 80  * 512 credits (or 8K for later versions), and the NetApp server
 81  * does not limit clients at all.  Choose a high enough default value
 82  * such that the client shouldn't limit performance, but allow mount
 83  * to override (until you approach 64K, where we limit credits to 65000
 84  * to reduce possibility of seeing more server credit overflow bugs.
 85  */
 86 #define SMB2_MAX_CREDITS_AVAILABLE 32000
 87 
 88 #include "cifspdu.h"
 89 
 90 #ifndef XATTR_DOS_ATTRIB
 91 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
 92 #endif
 93 
 94 /*
 95  * CIFS vfs client Status information (based on what we know.)
 96  */
 97 
 98 /* associated with each tcp and smb session */
 99 enum statusEnum {
100         CifsNew = 0,
101         CifsGood,
102         CifsExiting,
103         CifsNeedReconnect,
104         CifsNeedNegotiate
105 };
106 
107 enum securityEnum {
108         Unspecified = 0,        /* not specified */
109         LANMAN,                 /* Legacy LANMAN auth */
110         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
111         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
112         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
113         Kerberos,               /* Kerberos via SPNEGO */
114 };
115 
116 struct session_key {
117         unsigned int len;
118         char *response;
119 };
120 
121 /* crypto security descriptor definition */
122 struct sdesc {
123         struct shash_desc shash;
124         char ctx[];
125 };
126 
127 /* crypto hashing related structure/fields, not specific to a sec mech */
128 struct cifs_secmech {
129         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
130         struct crypto_shash *md5; /* md5 hash function */
131         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
132         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
133         struct crypto_shash *sha512; /* sha512 hash function */
134         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
135         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
136         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
137         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
138         struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
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_3any,
194         Smb_default,
195         Smb_version_err
196 };
197 
198 struct mid_q_entry;
199 struct TCP_Server_Info;
200 struct cifsFileInfo;
201 struct cifs_ses;
202 struct cifs_tcon;
203 struct dfs_info3_param;
204 struct cifs_fattr;
205 struct smb_vol;
206 struct cifs_fid;
207 struct cifs_readdata;
208 struct cifs_writedata;
209 struct cifs_io_parms;
210 struct cifs_search_info;
211 struct cifsInodeInfo;
212 struct cifs_open_parms;
213 
214 struct smb_version_operations {
215         int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
216                            struct mid_q_entry *);
217         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
218         /* setup request: allocate mid, sign message */
219         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
220                                                 struct smb_rqst *);
221         /* setup async request: allocate mid, sign message */
222         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
223                                                 struct smb_rqst *);
224         /* check response: verify signature, map error */
225         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
226                              bool);
227         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
228                             const int);
229         void (*set_credits)(struct TCP_Server_Info *, const int);
230         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
231         unsigned int (*get_credits)(struct mid_q_entry *);
232         __u64 (*get_next_mid)(struct TCP_Server_Info *);
233         /* data offset from read response message */
234         unsigned int (*read_data_offset)(char *);
235         /*
236          * Data length from read response message
237          * When in_remaining is true, the returned data length is in
238          * message field DataRemaining for out-of-band data read (e.g through
239          * Memory Registration RDMA write in SMBD).
240          * Otherwise, the returned data length is in message field DataLength.
241          */
242         unsigned int (*read_data_length)(char *, bool in_remaining);
243         /* map smb to linux error */
244         int (*map_error)(char *, bool);
245         /* find mid corresponding to the response message */
246         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
247         void (*dump_detail)(void *);
248         void (*clear_stats)(struct cifs_tcon *);
249         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
250         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
251         /* verify the message */
252         int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
253         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
254         int (*handle_cancelled_mid)(char *, struct TCP_Server_Info *);
255         void (*downgrade_oplock)(struct TCP_Server_Info *,
256                                         struct cifsInodeInfo *, bool);
257         /* process transaction2 response */
258         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
259                              char *, int);
260         /* check if we need to negotiate */
261         bool (*need_neg)(struct TCP_Server_Info *);
262         /* negotiate to the server */
263         int (*negotiate)(const unsigned int, struct cifs_ses *);
264         /* set negotiated write size */
265         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
266         /* set negotiated read size */
267         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
268         /* setup smb sessionn */
269         int (*sess_setup)(const unsigned int, struct cifs_ses *,
270                           const struct nls_table *);
271         /* close smb session */
272         int (*logoff)(const unsigned int, struct cifs_ses *);
273         /* connect to a server share */
274         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
275                             struct cifs_tcon *, const struct nls_table *);
276         /* close tree connecion */
277         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
278         /* get DFS referrals */
279         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
280                              const char *, struct dfs_info3_param **,
281                              unsigned int *, const struct nls_table *, int);
282         /* informational QFS call */
283         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
284         /* check if a path is accessible or not */
285         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
286                                   struct cifs_sb_info *, const char *);
287         /* query path data from the server */
288         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
289                                struct cifs_sb_info *, const char *,
290                                FILE_ALL_INFO *, bool *, bool *);
291         /* query file data from the server */
292         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
293                                struct cifs_fid *, FILE_ALL_INFO *);
294         /* get server index number */
295         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
296                             struct cifs_sb_info *, const char *,
297                             u64 *uniqueid, FILE_ALL_INFO *);
298         /* set size by path */
299         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
300                              const char *, __u64, struct cifs_sb_info *, bool);
301         /* set size by file handle */
302         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
303                              struct cifsFileInfo *, __u64, bool);
304         /* set attributes */
305         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
306                              const unsigned int);
307         int (*set_compression)(const unsigned int, struct cifs_tcon *,
308                                struct cifsFileInfo *);
309         /* check if we can send an echo or nor */
310         bool (*can_echo)(struct TCP_Server_Info *);
311         /* send echo request */
312         int (*echo)(struct TCP_Server_Info *);
313         /* create directory */
314         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
315                      struct cifs_sb_info *);
316         /* set info on created directory */
317         void (*mkdir_setinfo)(struct inode *, const char *,
318                               struct cifs_sb_info *, struct cifs_tcon *,
319                               const unsigned int);
320         /* remove directory */
321         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
322                      struct cifs_sb_info *);
323         /* unlink file */
324         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
325                       struct cifs_sb_info *);
326         /* open, rename and delete file */
327         int (*rename_pending_delete)(const char *, struct dentry *,
328                                      const unsigned int);
329         /* send rename request */
330         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
331                       const char *, struct cifs_sb_info *);
332         /* send create hardlink request */
333         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
334                                const char *, const char *,
335                                struct cifs_sb_info *);
336         /* query symlink target */
337         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
338                              const char *, char **, struct cifs_sb_info *);
339         /* open a file for non-posix mounts */
340         int (*open)(const unsigned int, struct cifs_open_parms *,
341                     __u32 *, FILE_ALL_INFO *);
342         /* set fid protocol-specific info */
343         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
344         /* close a file */
345         void (*close)(const unsigned int, struct cifs_tcon *,
346                       struct cifs_fid *);
347         /* send a flush request to the server */
348         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
349         /* async read from the server */
350         int (*async_readv)(struct cifs_readdata *);
351         /* async write to the server */
352         int (*async_writev)(struct cifs_writedata *,
353                             void (*release)(struct kref *));
354         /* sync read from the server */
355         int (*sync_read)(const unsigned int, struct cifs_fid *,
356                          struct cifs_io_parms *, unsigned int *, char **,
357                          int *);
358         /* sync write to the server */
359         int (*sync_write)(const unsigned int, struct cifs_fid *,
360                           struct cifs_io_parms *, unsigned int *, struct kvec *,
361                           unsigned long);
362         /* open dir, start readdir */
363         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
364                                const char *, struct cifs_sb_info *,
365                                struct cifs_fid *, __u16,
366                                struct cifs_search_info *);
367         /* continue readdir */
368         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
369                               struct cifs_fid *,
370                               __u16, struct cifs_search_info *srch_inf);
371         /* close dir */
372         int (*close_dir)(const unsigned int, struct cifs_tcon *,
373                          struct cifs_fid *);
374         /* calculate a size of SMB message */
375         unsigned int (*calc_smb_size)(void *);
376         /* check for STATUS_PENDING and process it in a positive case */
377         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
378         /* check for STATUS_NETWORK_SESSION_EXPIRED */
379         bool (*is_session_expired)(char *);
380         /* send oplock break response */
381         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
382                                struct cifsInodeInfo *);
383         /* query remote filesystem */
384         int (*queryfs)(const unsigned int, struct cifs_tcon *,
385                        struct kstatfs *);
386         /* send mandatory brlock to the server */
387         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
388                          __u64, __u32, int, int, bool);
389         /* unlock range of mandatory locks */
390         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
391                                  const unsigned int);
392         /* push brlocks from the cache to the server */
393         int (*push_mand_locks)(struct cifsFileInfo *);
394         /* get lease key of the inode */
395         void (*get_lease_key)(struct inode *, struct cifs_fid *);
396         /* set lease key of the inode */
397         void (*set_lease_key)(struct inode *, struct cifs_fid *);
398         /* generate new lease key */
399         void (*new_lease_key)(struct cifs_fid *);
400         int (*generate_signingkey)(struct cifs_ses *);
401         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
402         int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
403                              struct cifsFileInfo *src_file);
404         int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
405                              struct cifsFileInfo *src_file, void __user *);
406         int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
407                                 struct cifs_sb_info *, const unsigned char *,
408                                 char *, unsigned int *);
409         int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
410                                  struct cifs_sb_info *, const unsigned char *,
411                                  char *, unsigned int *);
412         /* if we can do cache read operations */
413         bool (*is_read_op)(__u32);
414         /* set oplock level for the inode */
415         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
416                                  bool *);
417         /* create lease context buffer for CREATE request */
418         char * (*create_lease_buf)(u8 *, u8);
419         /* parse lease context buffer and return oplock/epoch info */
420         __u8 (*parse_lease_buf)(void *, unsigned int *);
421         ssize_t (*copychunk_range)(const unsigned int,
422                         struct cifsFileInfo *src_file,
423                         struct cifsFileInfo *target_file,
424                         u64 src_off, u64 len, u64 dest_off);
425         int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
426                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
427                         u64 dest_off);
428         int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
429         ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
430                         const unsigned char *, const unsigned char *, char *,
431                         size_t, struct cifs_sb_info *);
432         int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
433                         const char *, const void *, const __u16,
434                         const struct nls_table *, struct cifs_sb_info *);
435         struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
436                         const char *, u32 *);
437         struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
438                         const struct cifs_fid *, u32 *);
439         int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
440                         int);
441         /* writepages retry size */
442         unsigned int (*wp_retry_size)(struct inode *);
443         /* get mtu credits */
444         int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
445                                 unsigned int *, unsigned int *);
446         /* check if we need to issue closedir */
447         bool (*dir_needs_close)(struct cifsFileInfo *);
448         long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
449                           loff_t);
450         /* init transform request - used for encryption for now */
451         int (*init_transform_rq)(struct TCP_Server_Info *, struct smb_rqst *,
452                                  struct smb_rqst *);
453         /* free transform request */
454         void (*free_transform_rq)(struct smb_rqst *);
455         int (*is_transform_hdr)(void *buf);
456         int (*receive_transform)(struct TCP_Server_Info *,
457                                  struct mid_q_entry **);
458         enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
459                             enum securityEnum);
460 
461 };
462 
463 struct smb_version_values {
464         char            *version_string;
465         __u16           protocol_id;
466         __u32           req_capabilities;
467         __u32           large_lock_type;
468         __u32           exclusive_lock_type;
469         __u32           shared_lock_type;
470         __u32           unlock_lock_type;
471         size_t          header_preamble_size;
472         size_t          header_size;
473         size_t          max_header_size;
474         size_t          read_rsp_size;
475         __le16          lock_cmd;
476         unsigned int    cap_unix;
477         unsigned int    cap_nt_find;
478         unsigned int    cap_large_files;
479         __u16           signing_enabled;
480         __u16           signing_required;
481         size_t          create_lease_size;
482 };
483 
484 #define HEADER_SIZE(server) (server->vals->header_size)
485 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
486 
487 struct smb_vol {
488         char *username;
489         char *password;
490         char *domainname;
491         char *UNC;
492         char *iocharset;  /* local code page for mapping to and from Unicode */
493         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
494         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
495         kuid_t cred_uid;
496         kuid_t linux_uid;
497         kgid_t linux_gid;
498         kuid_t backupuid;
499         kgid_t backupgid;
500         umode_t file_mode;
501         umode_t dir_mode;
502         enum securityEnum sectype; /* sectype requested via mnt opts */
503         bool sign; /* was signing requested via mnt opts? */
504         bool retry:1;
505         bool intr:1;
506         bool setuids:1;
507         bool setuidfromacl:1;
508         bool override_uid:1;
509         bool override_gid:1;
510         bool dynperm:1;
511         bool noperm:1;
512         bool no_psx_acl:1; /* set if posix acl support should be disabled */
513         bool cifs_acl:1;
514         bool backupuid_specified; /* mount option  backupuid  is specified */
515         bool backupgid_specified; /* mount option  backupgid  is specified */
516         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
517         bool server_ino:1; /* use inode numbers from server ie UniqueId */
518         bool direct_io:1;
519         bool strict_io:1; /* strict cache behavior */
520         bool remap:1;      /* set to remap seven reserved chars in filenames */
521         bool sfu_remap:1;  /* remap seven reserved chars ala SFU */
522         bool posix_paths:1; /* unset to not ask for posix pathnames. */
523         bool no_linux_ext:1;
524         bool sfu_emul:1;
525         bool nullauth:1;   /* attempt to authenticate with null user */
526         bool nocase:1;     /* request case insensitive filenames */
527         bool nobrl:1;      /* disable sending byte range locks to srv */
528         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
529         bool seal:1;       /* request transport encryption on share */
530         bool nodfs:1;      /* Do not request DFS, even if available */
531         bool local_lease:1; /* check leases only on local system, not remote */
532         bool noblocksnd:1;
533         bool noautotune:1;
534         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
535         bool fsc:1;     /* enable fscache */
536         bool mfsymlinks:1; /* use Minshall+French Symlinks */
537         bool multiuser:1;
538         bool rwpidforward:1; /* pid forward for read/write operations */
539         bool nosharesock:1;
540         bool persistent:1;
541         bool nopersistent:1;
542         bool resilient:1; /* noresilient not required since not fored for CA */
543         bool domainauto:1;
544         bool rdma:1;
545         unsigned int rsize;
546         unsigned int wsize;
547         bool sockopt_tcp_nodelay:1;
548         unsigned long actimeo; /* attribute cache timeout (jiffies) */
549         struct smb_version_operations *ops;
550         struct smb_version_values *vals;
551         char *prepath;
552         struct sockaddr_storage dstaddr; /* destination address */
553         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
554         struct nls_table *local_nls;
555         unsigned int echo_interval; /* echo interval in secs */
556         __u64 snapshot_time; /* needed for timewarp tokens */
557         unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
558 };
559 
560 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
561                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
562                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
563                          CIFS_MOUNT_MAP_SFM_CHR | \
564                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
565                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
566                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
567                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
568                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
569                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
570                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
571 
572 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
573                       SB_NODEV | SB_SYNCHRONOUS)
574 
575 struct cifs_mnt_data {
576         struct cifs_sb_info *cifs_sb;
577         struct smb_vol *vol;
578         int flags;
579 };
580 
581 static inline unsigned int
582 get_rfc1002_length(void *buf)
583 {
584         return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
585 }
586 
587 static inline void
588 inc_rfc1001_len(void *buf, int count)
589 {
590         be32_add_cpu((__be32 *)buf, count);
591 }
592 
593 struct TCP_Server_Info {
594         struct list_head tcp_ses_list;
595         struct list_head smb_ses_list;
596         int srv_count; /* reference counter */
597         /* 15 character server name + 0x20 16th byte indicating type = srv */
598         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
599         struct smb_version_operations   *ops;
600         struct smb_version_values       *vals;
601         enum statusEnum tcpStatus; /* what we think the status is */
602         char *hostname; /* hostname portion of UNC string */
603         struct socket *ssocket;
604         struct sockaddr_storage dstaddr;
605         struct sockaddr_storage srcaddr; /* locally bind to this IP */
606 #ifdef CONFIG_NET_NS
607         struct net *net;
608 #endif
609         wait_queue_head_t response_q;
610         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
611         struct list_head pending_mid_q;
612         bool noblocksnd;                /* use blocking sendmsg */
613         bool noautotune;                /* do not autotune send buf sizes */
614         bool tcp_nodelay;
615         unsigned int credits;  /* send no more requests at once */
616         unsigned int max_credits; /* can override large 32000 default at mnt */
617         unsigned int in_flight;  /* number of requests on the wire to server */
618         spinlock_t req_lock;  /* protect the two values above */
619         struct mutex srv_mutex;
620         struct task_struct *tsk;
621         char server_GUID[16];
622         __u16 sec_mode;
623         bool sign; /* is signing enabled on this connection? */
624         bool session_estab; /* mark when very first sess is established */
625         int echo_credits;  /* echo reserved slots */
626         int oplock_credits;  /* oplock break reserved slots */
627         bool echoes:1; /* enable echoes */
628         __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
629         u16 dialect; /* dialect index that server chose */
630         bool oplocks:1; /* enable oplocks */
631         unsigned int maxReq;    /* Clients should submit no more */
632         /* than maxReq distinct unanswered SMBs to the server when using  */
633         /* multiplexed reads or writes */
634         unsigned int maxBuf;    /* maxBuf specifies the maximum */
635         /* message size the server can send or receive for non-raw SMBs */
636         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
637         /* when socket is setup (and during reconnect) before NegProt sent */
638         unsigned int max_rw;    /* maxRw specifies the maximum */
639         /* message size the server can send or receive for */
640         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
641         unsigned int capabilities; /* selective disabling of caps by smb sess */
642         int timeAdj;  /* Adjust for difference in server time zone in sec */
643         __u64 CurrentMid;         /* multiplex id - rotating counter */
644         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
645         /* 16th byte of RFC1001 workstation name is always null */
646         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
647         __u32 sequence_number; /* for signing, protected by srv_mutex */
648         struct session_key session_key;
649         unsigned long lstrp; /* when we got last response from this server */
650         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
651 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
652 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
653 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
654         char    negflavor;      /* NEGOTIATE response flavor */
655         /* extended security flavors that server supports */
656         bool    sec_ntlmssp;            /* supports NTLMSSP */
657         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
658         bool    sec_kerberos;           /* supports plain Kerberos */
659         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
660         bool    large_buf;              /* is current buffer large? */
661         /* use SMBD connection instead of socket */
662         bool    rdma;
663         /* point to the SMBD connection if RDMA is used instead of socket */
664         struct smbd_connection *smbd_conn;
665         struct delayed_work     echo; /* echo ping workqueue job */
666         char    *smallbuf;      /* pointer to current "small" buffer */
667         char    *bigbuf;        /* pointer to current "big" buffer */
668         /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
669         unsigned int pdu_size;
670         unsigned int total_read; /* total amount of data read in this pass */
671 #ifdef CONFIG_CIFS_FSCACHE
672         struct fscache_cookie   *fscache; /* client index cache cookie */
673 #endif
674 #ifdef CONFIG_CIFS_STATS2
675         atomic_t in_send; /* requests trying to send */
676         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
677 #endif
678         unsigned int    max_read;
679         unsigned int    max_write;
680 #ifdef CONFIG_CIFS_SMB311
681         __le16  cipher_type;
682          /* save initital negprot hash */
683         __u8    preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
684 #endif /* 3.1.1 */
685         struct delayed_work reconnect; /* reconnect workqueue job */
686         struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
687         unsigned long echo_interval;
688 };
689 
690 static inline unsigned int
691 in_flight(struct TCP_Server_Info *server)
692 {
693         unsigned int num;
694         spin_lock(&server->req_lock);
695         num = server->in_flight;
696         spin_unlock(&server->req_lock);
697         return num;
698 }
699 
700 static inline bool
701 has_credits(struct TCP_Server_Info *server, int *credits)
702 {
703         int num;
704         spin_lock(&server->req_lock);
705         num = *credits;
706         spin_unlock(&server->req_lock);
707         return num > 0;
708 }
709 
710 static inline void
711 add_credits(struct TCP_Server_Info *server, const unsigned int add,
712             const int optype)
713 {
714         server->ops->add_credits(server, add, optype);
715 }
716 
717 static inline void
718 add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,
719                         const int optype)
720 {
721         if (add) {
722                 server->ops->add_credits(server, add, optype);
723                 wake_up(&server->request_q);
724         }
725 }
726 
727 static inline void
728 set_credits(struct TCP_Server_Info *server, const int val)
729 {
730         server->ops->set_credits(server, val);
731 }
732 
733 static inline __le64
734 get_next_mid64(struct TCP_Server_Info *server)
735 {
736         return cpu_to_le64(server->ops->get_next_mid(server));
737 }
738 
739 static inline __le16
740 get_next_mid(struct TCP_Server_Info *server)
741 {
742         __u16 mid = server->ops->get_next_mid(server);
743         /*
744          * The value in the SMB header should be little endian for easy
745          * on-the-wire decoding.
746          */
747         return cpu_to_le16(mid);
748 }
749 
750 static inline __u16
751 get_mid(const struct smb_hdr *smb)
752 {
753         return le16_to_cpu(smb->Mid);
754 }
755 
756 static inline bool
757 compare_mid(__u16 mid, const struct smb_hdr *smb)
758 {
759         return mid == le16_to_cpu(smb->Mid);
760 }
761 
762 /*
763  * When the server supports very large reads and writes via POSIX extensions,
764  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
765  * including the RFC1001 length.
766  *
767  * Note that this might make for "interesting" allocation problems during
768  * writeback however as we have to allocate an array of pointers for the
769  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
770  *
771  * For reads, there is a similar problem as we need to allocate an array
772  * of kvecs to handle the receive, though that should only need to be done
773  * once.
774  */
775 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
776 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
777 
778 /*
779  * When the server doesn't allow large posix writes, only allow a rsize/wsize
780  * of 2^17-1 minus the size of the call header. That allows for a read or
781  * write up to the maximum size described by RFC1002.
782  */
783 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
784 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
785 
786 /*
787  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
788  * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
789  * a single wsize request with a single call.
790  */
791 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
792 
793 /*
794  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
795  * those values when posix extensions aren't in force. In actuality here, we
796  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
797  * to be ok with the extra byte even though Windows doesn't send writes that
798  * are that large.
799  *
800  * Citation:
801  *
802  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
803  */
804 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
805 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
806 
807 /*
808  * Macros to allow the TCP_Server_Info->net field and related code to drop out
809  * when CONFIG_NET_NS isn't set.
810  */
811 
812 #ifdef CONFIG_NET_NS
813 
814 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
815 {
816         return srv->net;
817 }
818 
819 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
820 {
821         srv->net = net;
822 }
823 
824 #else
825 
826 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
827 {
828         return &init_net;
829 }
830 
831 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
832 {
833 }
834 
835 #endif
836 
837 /*
838  * Session structure.  One of these for each uid session with a particular host
839  */
840 struct cifs_ses {
841         struct list_head smb_ses_list;
842         struct list_head tcon_list;
843         struct cifs_tcon *tcon_ipc;
844         struct mutex session_mutex;
845         struct TCP_Server_Info *server; /* pointer to server info */
846         int ses_count;          /* reference counter */
847         enum statusEnum status;
848         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
849         char *serverOS;         /* name of operating system underlying server */
850         char *serverNOS;        /* name of network operating system of server */
851         char *serverDomain;     /* security realm of server */
852         __u64 Suid;             /* remote smb uid  */
853         kuid_t linux_uid;       /* overriding owner of files on the mount */
854         kuid_t cred_uid;        /* owner of credentials */
855         unsigned int capabilities;
856         char serverName[SERVER_NAME_LEN_WITH_NULL];
857         char *user_name;        /* must not be null except during init of sess
858                                    and after mount option parsing we fill it */
859         char *domainName;
860         char *password;
861         struct session_key auth_key;
862         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
863         enum securityEnum sectype; /* what security flavor was specified? */
864         bool sign;              /* is signing required? */
865         bool need_reconnect:1; /* connection reset, uid now invalid */
866         bool domainAuto:1;
867         __u16 session_flags;
868         __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
869         __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
870         __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
871 #ifdef CONFIG_CIFS_SMB311
872         __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
873 #endif /* 3.1.1 */
874 };
875 
876 static inline bool
877 cap_unix(struct cifs_ses *ses)
878 {
879         return ses->server->vals->cap_unix & ses->capabilities;
880 }
881 
882 /*
883  * there is one of these for each connection to a resource on a particular
884  * session
885  */
886 struct cifs_tcon {
887         struct list_head tcon_list;
888         int tc_count;
889         struct list_head rlist; /* reconnect list */
890         struct list_head openFileList;
891         spinlock_t open_file_lock; /* protects list above */
892         struct cifs_ses *ses;   /* pointer to session associated with */
893         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
894         char *nativeFileSystem;
895         char *password;         /* for share-level security */
896         __u32 tid;              /* The 4 byte tree id */
897         __u16 Flags;            /* optional support bits */
898         enum statusEnum tidStatus;
899 #ifdef CONFIG_CIFS_STATS
900         atomic_t num_smbs_sent;
901         union {
902                 struct {
903                         atomic_t num_writes;
904                         atomic_t num_reads;
905                         atomic_t num_flushes;
906                         atomic_t num_oplock_brks;
907                         atomic_t num_opens;
908                         atomic_t num_closes;
909                         atomic_t num_deletes;
910                         atomic_t num_mkdirs;
911                         atomic_t num_posixopens;
912                         atomic_t num_posixmkdirs;
913                         atomic_t num_rmdirs;
914                         atomic_t num_renames;
915                         atomic_t num_t2renames;
916                         atomic_t num_ffirst;
917                         atomic_t num_fnext;
918                         atomic_t num_fclose;
919                         atomic_t num_hardlinks;
920                         atomic_t num_symlinks;
921                         atomic_t num_locks;
922                         atomic_t num_acl_get;
923                         atomic_t num_acl_set;
924                 } cifs_stats;
925                 struct {
926                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
927                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
928                 } smb2_stats;
929         } stats;
930 #ifdef CONFIG_CIFS_STATS2
931         unsigned long long time_writes;
932         unsigned long long time_reads;
933         unsigned long long time_opens;
934         unsigned long long time_deletes;
935         unsigned long long time_closes;
936         unsigned long long time_mkdirs;
937         unsigned long long time_rmdirs;
938         unsigned long long time_renames;
939         unsigned long long time_t2renames;
940         unsigned long long time_ffirst;
941         unsigned long long time_fnext;
942         unsigned long long time_fclose;
943 #endif /* CONFIG_CIFS_STATS2 */
944         __u64    bytes_read;
945         __u64    bytes_written;
946         spinlock_t stat_lock;  /* protects the two fields above */
947 #endif /* CONFIG_CIFS_STATS */
948         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
949         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
950         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
951         bool ipc:1;   /* set if connection to IPC$ share (always also pipe) */
952         bool pipe:1;  /* set if connection to pipe share */
953         bool print:1; /* set if connection to printer share */
954         bool retry:1;
955         bool nocase:1;
956         bool seal:1;      /* transport encryption for this mounted share */
957         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
958                                 for this mount even if server would support */
959         bool local_lease:1; /* check leases (only) on local system not remote */
960         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
961         bool broken_sparse_sup; /* if server or share does not support sparse */
962         bool need_reconnect:1; /* connection reset, tid now invalid */
963         bool need_reopen_files:1; /* need to reopen tcon file handles */
964         bool use_resilient:1; /* use resilient instead of durable handles */
965         bool use_persistent:1; /* use persistent instead of durable handles */
966         __le32 capabilities;
967         __u32 share_flags;
968         __u32 maximal_access;
969         __u32 vol_serial_number;
970         __le64 vol_create_time;
971         __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
972         __u32 ss_flags;         /* sector size flags */
973         __u32 perf_sector_size; /* best sector size for perf */
974         __u32 max_chunks;
975         __u32 max_bytes_chunk;
976         __u32 max_bytes_copy;
977 #ifdef CONFIG_CIFS_FSCACHE
978         u64 resource_id;                /* server resource id */
979         struct fscache_cookie *fscache; /* cookie for share */
980 #endif
981         struct list_head pending_opens; /* list of incomplete opens */
982         /* BB add field for back pointer to sb struct(s)? */
983 };
984 
985 /*
986  * This is a refcounted and timestamped container for a tcon pointer. The
987  * container holds a tcon reference. It is considered safe to free one of
988  * these when the tl_count goes to 0. The tl_time is the time of the last
989  * "get" on the container.
990  */
991 struct tcon_link {
992         struct rb_node          tl_rbnode;
993         kuid_t                  tl_uid;
994         unsigned long           tl_flags;
995 #define TCON_LINK_MASTER        0
996 #define TCON_LINK_PENDING       1
997 #define TCON_LINK_IN_TREE       2
998         unsigned long           tl_time;
999         atomic_t                tl_count;
1000         struct cifs_tcon        *tl_tcon;
1001 };
1002 
1003 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1004 
1005 static inline struct cifs_tcon *
1006 tlink_tcon(struct tcon_link *tlink)
1007 {
1008         return tlink->tl_tcon;
1009 }
1010 
1011 extern void cifs_put_tlink(struct tcon_link *tlink);
1012 
1013 static inline struct tcon_link *
1014 cifs_get_tlink(struct tcon_link *tlink)
1015 {
1016         if (tlink && !IS_ERR(tlink))
1017                 atomic_inc(&tlink->tl_count);
1018         return tlink;
1019 }
1020 
1021 /* This function is always expected to succeed */
1022 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1023 
1024 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1025 
1026 struct cifs_pending_open {
1027         struct list_head olist;
1028         struct tcon_link *tlink;
1029         __u8 lease_key[16];
1030         __u32 oplock;
1031 };
1032 
1033 /*
1034  * This info hangs off the cifsFileInfo structure, pointed to by llist.
1035  * This is used to track byte stream locks on the file
1036  */
1037 struct cifsLockInfo {
1038         struct list_head llist; /* pointer to next cifsLockInfo */
1039         struct list_head blist; /* pointer to locks blocked on this */
1040         wait_queue_head_t block_q;
1041         __u64 offset;
1042         __u64 length;
1043         __u32 pid;
1044         __u32 type;
1045 };
1046 
1047 /*
1048  * One of these for each open instance of a file
1049  */
1050 struct cifs_search_info {
1051         loff_t index_of_last_entry;
1052         __u16 entries_in_buffer;
1053         __u16 info_level;
1054         __u32 resume_key;
1055         char *ntwrk_buf_start;
1056         char *srch_entries_start;
1057         char *last_entry;
1058         const char *presume_name;
1059         unsigned int resume_name_len;
1060         bool endOfSearch:1;
1061         bool emptyDir:1;
1062         bool unicode:1;
1063         bool smallBuf:1; /* so we know which buf_release function to call */
1064 };
1065 
1066 struct cifs_open_parms {
1067         struct cifs_tcon *tcon;
1068         struct cifs_sb_info *cifs_sb;
1069         int disposition;
1070         int desired_access;
1071         int create_options;
1072         const char *path;
1073         struct cifs_fid *fid;
1074         bool reconnect:1;
1075 };
1076 
1077 struct cifs_fid {
1078         __u16 netfid;
1079         __u64 persistent_fid;   /* persist file id for smb2 */
1080         __u64 volatile_fid;     /* volatile file id for smb2 */
1081         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
1082         __u8 create_guid[16];
1083         struct cifs_pending_open *pending_open;
1084         unsigned int epoch;
1085         bool purge_cache;
1086 };
1087 
1088 struct cifs_fid_locks {
1089         struct list_head llist;
1090         struct cifsFileInfo *cfile;     /* fid that owns locks */
1091         struct list_head locks;         /* locks held by fid above */
1092 };
1093 
1094 struct cifsFileInfo {
1095         /* following two lists are protected by tcon->open_file_lock */
1096         struct list_head tlist; /* pointer to next fid owned by tcon */
1097         struct list_head flist; /* next fid (file instance) for this inode */
1098         /* lock list below protected by cifsi->lock_sem */
1099         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
1100         kuid_t uid;             /* allows finding which FileInfo structure */
1101         __u32 pid;              /* process id who opened file */
1102         struct cifs_fid fid;    /* file id from remote */
1103         struct list_head rlist; /* reconnect list */
1104         /* BB add lock scope info here if needed */ ;
1105         /* lock scope id (0 if none) */
1106         struct dentry *dentry;
1107         struct tcon_link *tlink;
1108         unsigned int f_flags;
1109         bool invalidHandle:1;   /* file closed via session abend */
1110         bool oplock_break_cancelled:1;
1111         int count;
1112         spinlock_t file_info_lock; /* protects four flag/count fields above */
1113         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1114         struct cifs_search_info srch_inf;
1115         struct work_struct oplock_break; /* work for oplock breaks */
1116 };
1117 
1118 struct cifs_io_parms {
1119         __u16 netfid;
1120         __u64 persistent_fid;   /* persist file id for smb2 */
1121         __u64 volatile_fid;     /* volatile file id for smb2 */
1122         __u32 pid;
1123         __u64 offset;
1124         unsigned int length;
1125         struct cifs_tcon *tcon;
1126 };
1127 
1128 struct cifs_aio_ctx {
1129         struct kref             refcount;
1130         struct list_head        list;
1131         struct mutex            aio_mutex;
1132         struct completion       done;
1133         struct iov_iter         iter;
1134         struct kiocb            *iocb;
1135         struct cifsFileInfo     *cfile;
1136         struct bio_vec          *bv;
1137         loff_t                  pos;
1138         unsigned int            npages;
1139         ssize_t                 rc;
1140         unsigned int            len;
1141         unsigned int            total_len;
1142         bool                    should_dirty;
1143 };
1144 
1145 struct cifs_readdata;
1146 
1147 /* asynchronous read support */
1148 struct cifs_readdata {
1149         struct kref                     refcount;
1150         struct list_head                list;
1151         struct completion               done;
1152         struct cifsFileInfo             *cfile;
1153         struct address_space            *mapping;
1154         struct cifs_aio_ctx             *ctx;
1155         __u64                           offset;
1156         unsigned int                    bytes;
1157         unsigned int                    got_bytes;
1158         pid_t                           pid;
1159         int                             result;
1160         struct work_struct              work;
1161         int (*read_into_pages)(struct TCP_Server_Info *server,
1162                                 struct cifs_readdata *rdata,
1163                                 unsigned int len);
1164         int (*copy_into_pages)(struct TCP_Server_Info *server,
1165                                 struct cifs_readdata *rdata,
1166                                 struct iov_iter *iter);
1167         struct kvec                     iov[2];
1168 #ifdef CONFIG_CIFS_SMB_DIRECT
1169         struct smbd_mr                  *mr;
1170 #endif
1171         unsigned int                    pagesz;
1172         unsigned int                    tailsz;
1173         unsigned int                    credits;
1174         unsigned int                    nr_pages;
1175         struct page                     *pages[];
1176 };
1177 
1178 struct cifs_writedata;
1179 
1180 /* asynchronous write support */
1181 struct cifs_writedata {
1182         struct kref                     refcount;
1183         struct list_head                list;
1184         struct completion               done;
1185         enum writeback_sync_modes       sync_mode;
1186         struct work_struct              work;
1187         struct cifsFileInfo             *cfile;
1188         struct cifs_aio_ctx             *ctx;
1189         __u64                           offset;
1190         pid_t                           pid;
1191         unsigned int                    bytes;
1192         int                             result;
1193 #ifdef CONFIG_CIFS_SMB_DIRECT
1194         struct smbd_mr                  *mr;
1195 #endif
1196         unsigned int                    pagesz;
1197         unsigned int                    tailsz;
1198         unsigned int                    credits;
1199         unsigned int                    nr_pages;
1200         struct page                     *pages[];
1201 };
1202 
1203 /*
1204  * Take a reference on the file private data. Must be called with
1205  * cfile->file_info_lock held.
1206  */
1207 static inline void
1208 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1209 {
1210         ++cifs_file->count;
1211 }
1212 
1213 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1214 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1215 
1216 #define CIFS_CACHE_READ_FLG     1
1217 #define CIFS_CACHE_HANDLE_FLG   2
1218 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1219 #define CIFS_CACHE_WRITE_FLG    4
1220 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1221 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1222 
1223 #define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
1224 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1225 #define CIFS_CACHE_WRITE(cinode) (cinode->oplock & CIFS_CACHE_WRITE_FLG)
1226 
1227 /*
1228  * One of these for each file inode
1229  */
1230 
1231 struct cifsInodeInfo {
1232         bool can_cache_brlcks;
1233         struct list_head llist; /* locks helb by this inode */
1234         struct rw_semaphore lock_sem;   /* protect the fields above */
1235         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1236         struct list_head openFileList;
1237         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1238         unsigned int oplock;            /* oplock/lease level we have */
1239         unsigned int epoch;             /* used to track lease state changes */
1240 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1241 #define CIFS_INODE_PENDING_WRITERS        (1) /* Writes in progress */
1242 #define CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 (2) /* Downgrade oplock to L2 */
1243 #define CIFS_INO_DELETE_PENDING           (3) /* delete pending on server */
1244 #define CIFS_INO_INVALID_MAPPING          (4) /* pagecache is invalid */
1245 #define CIFS_INO_LOCK                     (5) /* lock bit for synchronization */
1246         unsigned long flags;
1247         spinlock_t writers_lock;
1248         unsigned int writers;           /* Number of writers on this inode */
1249         unsigned long time;             /* jiffies of last update of inode */
1250         u64  server_eof;                /* current file size on server -- protected by i_lock */
1251         u64  uniqueid;                  /* server inode number */
1252         u64  createtime;                /* creation time on server */
1253         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1254 #ifdef CONFIG_CIFS_FSCACHE
1255         struct fscache_cookie *fscache;
1256 #endif
1257         struct inode vfs_inode;
1258 };
1259 
1260 static inline struct cifsInodeInfo *
1261 CIFS_I(struct inode *inode)
1262 {
1263         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1264 }
1265 
1266 static inline struct cifs_sb_info *
1267 CIFS_SB(struct super_block *sb)
1268 {
1269         return sb->s_fs_info;
1270 }
1271 
1272 static inline struct cifs_sb_info *
1273 CIFS_FILE_SB(struct file *file)
1274 {
1275         return CIFS_SB(file_inode(file)->i_sb);
1276 }
1277 
1278 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1279 {
1280         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1281                 return '/';
1282         else
1283                 return '\\';
1284 }
1285 
1286 static inline void
1287 convert_delimiter(char *path, char delim)
1288 {
1289         char old_delim, *pos;
1290 
1291         if (delim == '/')
1292                 old_delim = '\\';
1293         else
1294                 old_delim = '/';
1295 
1296         pos = path;
1297         while ((pos = strchr(pos, old_delim)))
1298                 *pos = delim;
1299 }
1300 
1301 #ifdef CONFIG_CIFS_STATS
1302 #define cifs_stats_inc atomic_inc
1303 
1304 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1305                                             unsigned int bytes)
1306 {
1307         if (bytes) {
1308                 spin_lock(&tcon->stat_lock);
1309                 tcon->bytes_written += bytes;
1310                 spin_unlock(&tcon->stat_lock);
1311         }
1312 }
1313 
1314 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1315                                          unsigned int bytes)
1316 {
1317         spin_lock(&tcon->stat_lock);
1318         tcon->bytes_read += bytes;
1319         spin_unlock(&tcon->stat_lock);
1320 }
1321 #else
1322 
1323 #define  cifs_stats_inc(field) do {} while (0)
1324 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1325 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1326 
1327 #endif
1328 
1329 
1330 /*
1331  * This is the prototype for the mid receive function. This function is for
1332  * receiving the rest of the SMB frame, starting with the WordCount (which is
1333  * just after the MID in struct smb_hdr). Note:
1334  *
1335  * - This will be called by cifsd, with no locks held.
1336  * - The mid will still be on the pending_mid_q.
1337  * - mid->resp_buf will point to the current buffer.
1338  *
1339  * Returns zero on a successful receive, or an error. The receive state in
1340  * the TCP_Server_Info will also be updated.
1341  */
1342 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1343                             struct mid_q_entry *mid);
1344 
1345 /*
1346  * This is the prototype for the mid callback function. This is called once the
1347  * mid has been received off of the socket. When creating one, take special
1348  * care to avoid deadlocks. Things to bear in mind:
1349  *
1350  * - it will be called by cifsd, with no locks held
1351  * - the mid will be removed from any lists
1352  */
1353 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1354 
1355 /*
1356  * This is the protopyte for mid handle function. This is called once the mid
1357  * has been recognized after decryption of the message.
1358  */
1359 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1360                             struct mid_q_entry *mid);
1361 
1362 /* one of these for every pending CIFS request to the server */
1363 struct mid_q_entry {
1364         struct list_head qhead; /* mids waiting on reply from this server */
1365         struct kref refcount;
1366         struct TCP_Server_Info *server; /* server corresponding to this mid */
1367         __u64 mid;              /* multiplex id */
1368         __u32 pid;              /* process id */
1369         __u32 sequence_number;  /* for CIFS signing */
1370         unsigned long when_alloc;  /* when mid was created */
1371 #ifdef CONFIG_CIFS_STATS2
1372         unsigned long when_sent; /* time when smb send finished */
1373         unsigned long when_received; /* when demux complete (taken off wire) */
1374 #endif
1375         mid_receive_t *receive; /* call receive callback */
1376         mid_callback_t *callback; /* call completion callback */
1377         mid_handle_t *handle; /* call handle mid callback */
1378         void *callback_data;      /* general purpose pointer for callback */
1379         void *resp_buf;         /* pointer to received SMB header */
1380         unsigned int resp_buf_size;
1381         int mid_state;  /* wish this were enum but can not pass to wait_event */
1382         unsigned int mid_flags;
1383         __le16 command;         /* smb command code */
1384         bool large_buf:1;       /* if valid response, is pointer to large buf */
1385         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1386         bool multiEnd:1;        /* both received */
1387         bool decrypted:1;       /* decrypted entry */
1388 };
1389 
1390 struct close_cancelled_open {
1391         struct cifs_fid         fid;
1392         struct cifs_tcon        *tcon;
1393         struct work_struct      work;
1394 };
1395 
1396 /*      Make code in transport.c a little cleaner by moving
1397         update of optional stats into function below */
1398 #ifdef CONFIG_CIFS_STATS2
1399 
1400 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1401 {
1402         atomic_inc(&server->in_send);
1403 }
1404 
1405 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1406 {
1407         atomic_dec(&server->in_send);
1408 }
1409 
1410 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1411 {
1412         atomic_inc(&server->num_waiters);
1413 }
1414 
1415 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1416 {
1417         atomic_dec(&server->num_waiters);
1418 }
1419 
1420 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1421 {
1422         mid->when_sent = jiffies;
1423 }
1424 #else
1425 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1426 {
1427 }
1428 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1429 {
1430 }
1431 
1432 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1433 {
1434 }
1435 
1436 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1437 {
1438 }
1439 
1440 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1441 {
1442 }
1443 #endif
1444 
1445 /* for pending dnotify requests */
1446 struct dir_notify_req {
1447         struct list_head lhead;
1448         __le16 Pid;
1449         __le16 PidHigh;
1450         __u16 Mid;
1451         __u16 Tid;
1452         __u16 Uid;
1453         __u16 netfid;
1454         __u32 filter; /* CompletionFilter (for multishot) */
1455         int multishot;
1456         struct file *pfile;
1457 };
1458 
1459 struct dfs_info3_param {
1460         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1461         int path_consumed;
1462         int server_type;
1463         int ref_flag;
1464         char *path_name;
1465         char *node_name;
1466 };
1467 
1468 /*
1469  * common struct for holding inode info when searching for or updating an
1470  * inode with new info
1471  */
1472 
1473 #define CIFS_FATTR_DFS_REFERRAL         0x1
1474 #define CIFS_FATTR_DELETE_PENDING       0x2
1475 #define CIFS_FATTR_NEED_REVAL           0x4
1476 #define CIFS_FATTR_INO_COLLISION        0x8
1477 #define CIFS_FATTR_UNKNOWN_NLINK        0x10
1478 #define CIFS_FATTR_FAKE_ROOT_INO        0x20
1479 
1480 struct cifs_fattr {
1481         u32             cf_flags;
1482         u32             cf_cifsattrs;
1483         u64             cf_uniqueid;
1484         u64             cf_eof;
1485         u64             cf_bytes;
1486         u64             cf_createtime;
1487         kuid_t          cf_uid;
1488         kgid_t          cf_gid;
1489         umode_t         cf_mode;
1490         dev_t           cf_rdev;
1491         unsigned int    cf_nlink;
1492         unsigned int    cf_dtype;
1493         struct timespec cf_atime;
1494         struct timespec cf_mtime;
1495         struct timespec cf_ctime;
1496 };
1497 
1498 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1499 {
1500         if (param) {
1501                 kfree(param->path_name);
1502                 kfree(param->node_name);
1503                 kfree(param);
1504         }
1505 }
1506 
1507 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1508                                        int number_of_items)
1509 {
1510         int i;
1511         if ((number_of_items == 0) || (param == NULL))
1512                 return;
1513         for (i = 0; i < number_of_items; i++) {
1514                 kfree(param[i].path_name);
1515                 kfree(param[i].node_name);
1516         }
1517         kfree(param);
1518 }
1519 
1520 #define   MID_FREE 0
1521 #define   MID_REQUEST_ALLOCATED 1
1522 #define   MID_REQUEST_SUBMITTED 2
1523 #define   MID_RESPONSE_RECEIVED 4
1524 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1525 #define   MID_RESPONSE_MALFORMED 0x10
1526 #define   MID_SHUTDOWN           0x20
1527 
1528 /* Flags */
1529 #define   MID_WAIT_CANCELLED     1 /* Cancelled while waiting for response */
1530 
1531 /* Types of response buffer returned from SendReceive2 */
1532 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1533 #define   CIFS_SMALL_BUFFER     1
1534 #define   CIFS_LARGE_BUFFER     2
1535 #define   CIFS_IOVEC            4    /* array of response buffers */
1536 
1537 /* Type of Request to SendReceive2 */
1538 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1539 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1540 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1541 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1542 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1543 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1544 
1545 /* Type of request operation */
1546 #define   CIFS_ECHO_OP      0x080    /* echo request */
1547 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1548 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1549 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1550 
1551 #define   CIFS_HAS_CREDITS 0x0400    /* already has credits */
1552 #define   CIFS_TRANSFORM_REQ 0x0800    /* transform request before sending */
1553 
1554 /* Security Flags: indicate type of session setup needed */
1555 #define   CIFSSEC_MAY_SIGN      0x00001
1556 #define   CIFSSEC_MAY_NTLM      0x00002
1557 #define   CIFSSEC_MAY_NTLMV2    0x00004
1558 #define   CIFSSEC_MAY_KRB5      0x00008
1559 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1560 #define   CIFSSEC_MAY_LANMAN    0x00010
1561 #define   CIFSSEC_MAY_PLNTXT    0x00020
1562 #else
1563 #define   CIFSSEC_MAY_LANMAN    0
1564 #define   CIFSSEC_MAY_PLNTXT    0
1565 #endif /* weak passwords */
1566 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1567 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1568 
1569 #define   CIFSSEC_MUST_SIGN     0x01001
1570 /* note that only one of the following can be set so the
1571 result of setting MUST flags more than once will be to
1572 require use of the stronger protocol */
1573 #define   CIFSSEC_MUST_NTLM     0x02002
1574 #define   CIFSSEC_MUST_NTLMV2   0x04004
1575 #define   CIFSSEC_MUST_KRB5     0x08008
1576 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1577 #define   CIFSSEC_MUST_LANMAN   0x10010
1578 #define   CIFSSEC_MUST_PLNTXT   0x20020
1579 #ifdef CONFIG_CIFS_UPCALL
1580 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1581 #else
1582 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1583 #endif /* UPCALL */
1584 #else /* do not allow weak pw hash */
1585 #define   CIFSSEC_MUST_LANMAN   0
1586 #define   CIFSSEC_MUST_PLNTXT   0
1587 #ifdef CONFIG_CIFS_UPCALL
1588 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1589 #else
1590 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1591 #endif /* UPCALL */
1592 #endif /* WEAK_PW_HASH */
1593 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1594 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1595 
1596 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1597 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1598 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1599 /*
1600  *****************************************************************
1601  * All constants go here
1602  *****************************************************************
1603  */
1604 
1605 #define UID_HASH (16)
1606 
1607 /*
1608  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1609  * following to be declared.
1610  */
1611 
1612 /****************************************************************************
1613  *  Locking notes.  All updates to global variables and lists should be
1614  *                  protected by spinlocks or semaphores.
1615  *
1616  *  Spinlocks
1617  *  ---------
1618  *  GlobalMid_Lock protects:
1619  *      list operations on pending_mid_q and oplockQ
1620  *      updates to XID counters, multiplex id  and SMB sequence numbers
1621  *  tcp_ses_lock protects:
1622  *      list operations on tcp and SMB session lists
1623  *  tcon->open_file_lock protects the list of open files hanging off the tcon
1624  *  cfile->file_info_lock protects counters and fields in cifs file struct
1625  *  f_owner.lock protects certain per file struct operations
1626  *  mapping->page_lock protects certain per page operations
1627  *
1628  *  Semaphores
1629  *  ----------
1630  *  sesSem     operations on smb session
1631  *  tconSem    operations on tree connection
1632  *  fh_sem      file handle reconnection operations
1633  *
1634  ****************************************************************************/
1635 
1636 #ifdef DECLARE_GLOBALS_HERE
1637 #define GLOBAL_EXTERN
1638 #else
1639 #define GLOBAL_EXTERN extern
1640 #endif
1641 
1642 /*
1643  * the list of TCP_Server_Info structures, ie each of the sockets
1644  * connecting our client to a distinct server (ip address), is
1645  * chained together by cifs_tcp_ses_list. The list of all our SMB
1646  * sessions (and from that the tree connections) can be found
1647  * by iterating over cifs_tcp_ses_list
1648  */
1649 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1650 
1651 /*
1652  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1653  * tcp session, and the list of tcon's per smb session. It also protects
1654  * the reference counters for the server, smb session, and tcon. Finally,
1655  * changes to the tcon->tidStatus should be done while holding this lock.
1656  * generally the locks should be taken in order tcp_ses_lock before
1657  * tcon->open_file_lock and that before file->file_info_lock since the
1658  * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1659  */
1660 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1661 
1662 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1663 /* Outstanding dir notify requests */
1664 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1665 /* DirNotify response queue */
1666 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1667 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1668 
1669 /*
1670  * Global transaction id (XID) information
1671  */
1672 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1673 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1674 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1675 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1676                                           /* on midQ entries */
1677 /*
1678  *  Global counters, updated atomically
1679  */
1680 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1681 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1682 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1683 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1684 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1685 
1686 /* Various Debug counters */
1687 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1688 #ifdef CONFIG_CIFS_STATS2
1689 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1690 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1691 #endif
1692 GLOBAL_EXTERN atomic_t smBufAllocCount;
1693 GLOBAL_EXTERN atomic_t midCount;
1694 
1695 /* Misc globals */
1696 GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1697 GLOBAL_EXTERN bool lookupCacheEnabled;
1698 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1699                                 with more secure ntlmssp2 challenge/resp */
1700 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1701 GLOBAL_EXTERN bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1702 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1703 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1704 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1705 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1706 
1707 #ifdef CONFIG_CIFS_ACL
1708 GLOBAL_EXTERN struct rb_root uidtree;
1709 GLOBAL_EXTERN struct rb_root gidtree;
1710 GLOBAL_EXTERN spinlock_t siduidlock;
1711 GLOBAL_EXTERN spinlock_t sidgidlock;
1712 GLOBAL_EXTERN struct rb_root siduidtree;
1713 GLOBAL_EXTERN struct rb_root sidgidtree;
1714 GLOBAL_EXTERN spinlock_t uidsidlock;
1715 GLOBAL_EXTERN spinlock_t gidsidlock;
1716 #endif /* CONFIG_CIFS_ACL */
1717 
1718 void cifs_oplock_break(struct work_struct *work);
1719 
1720 extern const struct slow_work_ops cifs_oplock_break_ops;
1721 extern struct workqueue_struct *cifsiod_wq;
1722 extern struct workqueue_struct *cifsoplockd_wq;
1723 extern __u32 cifs_lock_secret;
1724 
1725 extern mempool_t *cifs_mid_poolp;
1726 
1727 /* Operations for different SMB versions */
1728 #define SMB1_VERSION_STRING     "1.0"
1729 extern struct smb_version_operations smb1_operations;
1730 extern struct smb_version_values smb1_values;
1731 #define SMB20_VERSION_STRING    "2.0"
1732 extern struct smb_version_operations smb20_operations;
1733 extern struct smb_version_values smb20_values;
1734 #define SMB21_VERSION_STRING    "2.1"
1735 extern struct smb_version_operations smb21_operations;
1736 extern struct smb_version_values smb21_values;
1737 #define SMBDEFAULT_VERSION_STRING "default"
1738 extern struct smb_version_values smbdefault_values;
1739 #define SMB3ANY_VERSION_STRING "3"
1740 extern struct smb_version_values smb3any_values;
1741 #define SMB30_VERSION_STRING    "3.0"
1742 extern struct smb_version_operations smb30_operations;
1743 extern struct smb_version_values smb30_values;
1744 #define SMB302_VERSION_STRING   "3.02"
1745 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1746 extern struct smb_version_values smb302_values;
1747 #define SMB311_VERSION_STRING   "3.1.1"
1748 #define ALT_SMB311_VERSION_STRING "3.11"
1749 extern struct smb_version_operations smb311_operations;
1750 extern struct smb_version_values smb311_values;
1751 #endif  /* _CIFS_GLOB_H */
1752 

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