1 /* SPDX-License-Identifier: LGPL-2.1 */
5 * Copyright (C) International Business Machines Corp., 2002,2008
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org)
14 #include <linux/in6.h>
15 #include <linux/inet.h>
16 #include <linux/slab.h>
17 #include <linux/mempool.h>
18 #include <linux/workqueue.h>
19 #include "cifs_fs_sb.h"
21 #include <crypto/internal/hash.h>
22 #include <linux/scatterlist.h>
23 #include <uapi/linux/cifs/cifs_mount.h>
26 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
28 #define SMB_PATH_MAX 260
30 #define RFC1001_PORT 139
33 * The sizes of various internal tables and strings
35 #define MAX_UID_INFO 16
36 #define MAX_SES_INFO 2
37 #define MAX_TCON_INFO 4
39 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
41 #define CIFS_MIN_RCV_POOL 4
43 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
45 * default attribute cache timeout (jiffies)
47 #define CIFS_DEF_ACTIMEO (1 * HZ)
50 * max attribute cache timeout (jiffies) - 2^30
52 #define CIFS_MAX_ACTIMEO (1 << 30)
55 * Max persistent and resilient handle timeout (milliseconds).
56 * Windows durable max was 960000 (16 minutes)
58 #define SMB3_MAX_HANDLE_TIMEOUT 960000
61 * MAX_REQ is the maximum number of requests that WE will send
62 * on one socket concurrently.
64 #define CIFS_MAX_REQ 32767
66 #define RFC1001_NAME_LEN 15
67 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
69 /* maximum length of ip addr as a string (including ipv6 and sctp) */
70 #define SERVER_NAME_LENGTH 80
71 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
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
78 /* maximum number of PDUs in one compound */
79 #define MAX_COMPOUND 5
82 * Default number of credits to keep available for SMB3.
83 * This value is chosen somewhat arbitrarily. The Windows client
84 * defaults to 128 credits, the Windows server allows clients up to
85 * 512 credits (or 8K for later versions), and the NetApp server
86 * does not limit clients at all. Choose a high enough default value
87 * such that the client shouldn't limit performance, but allow mount
88 * to override (until you approach 64K, where we limit credits to 65000
89 * to reduce possibility of seeing more server credit overflow bugs.
91 #define SMB2_MAX_CREDITS_AVAILABLE 32000
95 #ifndef XATTR_DOS_ATTRIB
96 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
100 * CIFS vfs client Status information (based on what we know.)
103 /* associated with each tcp and smb session */
113 Unspecified = 0, /* not specified */
114 LANMAN, /* Legacy LANMAN auth */
115 NTLM, /* Legacy NTLM012 auth with NTLM hash */
116 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
117 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
118 Kerberos, /* Kerberos via SPNEGO */
126 /* crypto security descriptor definition */
128 struct shash_desc shash;
132 /* crypto hashing related structure/fields, not specific to a sec mech */
133 struct cifs_secmech {
134 struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
135 struct crypto_shash *md5; /* md5 hash function */
136 struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
137 struct crypto_shash *cmacaes; /* block-cipher based MAC function */
138 struct crypto_shash *sha512; /* sha512 hash function */
139 struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
140 struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
141 struct sdesc *sdeschmacsha256; /* ctxt to generate smb2 signature */
142 struct sdesc *sdesccmacaes; /* ctxt to generate smb3 signature */
143 struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
144 struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
145 struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
148 /* per smb session structure/fields */
149 struct ntlmssp_auth {
150 bool sesskey_per_smbsess; /* whether session key is per smb session */
151 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
152 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
153 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
154 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
162 struct cifs_sid osid;
163 struct cifs_sid gsid;
164 struct cifs_ntace *ntaces;
165 struct cifs_ace *aces;
169 *****************************************************************
170 * Except the CIFS PDUs themselves all the
171 * globally interesting structs should go here
172 *****************************************************************
176 * A smb_rqst represents a complete request to be issued to a server. It's
177 * formed by a kvec array, followed by an array of pages. Page data is assumed
178 * to start at the beginning of the first page.
181 struct kvec *rq_iov; /* array of kvecs */
182 unsigned int rq_nvec; /* number of kvecs in array */
183 struct page **rq_pages; /* pointer to array of page ptrs */
184 unsigned int rq_offset; /* the offset to the 1st page */
185 unsigned int rq_npages; /* number pages in array */
186 unsigned int rq_pagesz; /* page size to use */
187 unsigned int rq_tailsz; /* length of last page */
191 struct TCP_Server_Info;
195 struct dfs_info3_param;
197 struct smb3_fs_context;
199 struct cifs_readdata;
200 struct cifs_writedata;
201 struct cifs_io_parms;
202 struct cifs_search_info;
203 struct cifsInodeInfo;
204 struct cifs_open_parms;
207 struct smb_version_operations {
208 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
209 struct mid_q_entry *);
210 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
211 /* setup request: allocate mid, sign message */
212 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
213 struct TCP_Server_Info *,
215 /* setup async request: allocate mid, sign message */
216 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
218 /* check response: verify signature, map error */
219 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
221 void (*add_credits)(struct TCP_Server_Info *server,
222 const struct cifs_credits *credits,
224 void (*set_credits)(struct TCP_Server_Info *, const int);
225 int * (*get_credits_field)(struct TCP_Server_Info *, const int);
226 unsigned int (*get_credits)(struct mid_q_entry *);
227 __u64 (*get_next_mid)(struct TCP_Server_Info *);
228 void (*revert_current_mid)(struct TCP_Server_Info *server,
229 const unsigned int val);
230 /* data offset from read response message */
231 unsigned int (*read_data_offset)(char *);
233 * Data length from read response message
234 * When in_remaining is true, the returned data length is in
235 * message field DataRemaining for out-of-band data read (e.g through
236 * Memory Registration RDMA write in SMBD).
237 * Otherwise, the returned data length is in message field DataLength.
239 unsigned int (*read_data_length)(char *, bool in_remaining);
240 /* map smb to linux error */
241 int (*map_error)(char *, bool);
242 /* find mid corresponding to the response message */
243 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
244 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
245 void (*clear_stats)(struct cifs_tcon *);
246 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
247 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
248 /* verify the message */
249 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
250 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
251 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
252 void (*downgrade_oplock)(struct TCP_Server_Info *server,
253 struct cifsInodeInfo *cinode, __u32 oplock,
254 unsigned int epoch, bool *purge_cache);
255 /* process transaction2 response */
256 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
258 /* check if we need to negotiate */
259 bool (*need_neg)(struct TCP_Server_Info *);
260 /* negotiate to the server */
261 int (*negotiate)(const unsigned int, struct cifs_ses *);
262 /* set negotiated write size */
263 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
264 /* set negotiated read size */
265 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
266 /* setup smb sessionn */
267 int (*sess_setup)(const unsigned int, struct cifs_ses *,
268 const struct nls_table *);
269 /* close smb session */
270 int (*logoff)(const unsigned int, struct cifs_ses *);
271 /* connect to a server share */
272 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
273 struct cifs_tcon *, const struct nls_table *);
274 /* close tree connecion */
275 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
276 /* get DFS referrals */
277 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
278 const char *, struct dfs_info3_param **,
279 unsigned int *, const struct nls_table *, int);
280 /* informational QFS call */
281 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
282 struct cifs_sb_info *);
283 /* check if a path is accessible or not */
284 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
285 struct cifs_sb_info *, const char *);
286 /* query path data from the server */
287 int (*query_path_info)(const unsigned int, struct cifs_tcon *,
288 struct cifs_sb_info *, const char *,
289 FILE_ALL_INFO *, bool *, bool *);
290 /* query file data from the server */
291 int (*query_file_info)(const unsigned int, struct cifs_tcon *,
292 struct cifs_fid *, FILE_ALL_INFO *);
293 /* query reparse tag from srv to determine which type of special file */
294 int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
295 struct cifs_sb_info *cifs_sb, const char *path,
297 /* get server index number */
298 int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
299 struct cifs_sb_info *, const char *,
300 u64 *uniqueid, FILE_ALL_INFO *);
301 /* set size by path */
302 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
303 const char *, __u64, struct cifs_sb_info *, bool);
304 /* set size by file handle */
305 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
306 struct cifsFileInfo *, __u64, bool);
308 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
310 int (*set_compression)(const unsigned int, struct cifs_tcon *,
311 struct cifsFileInfo *);
312 /* check if we can send an echo or nor */
313 bool (*can_echo)(struct TCP_Server_Info *);
314 /* send echo request */
315 int (*echo)(struct TCP_Server_Info *);
316 /* create directory */
317 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
318 umode_t mode, struct cifs_tcon *tcon,
319 const char *full_path,
320 struct cifs_sb_info *cifs_sb);
321 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
322 struct cifs_tcon *tcon, const char *name,
323 struct cifs_sb_info *sb);
324 /* set info on created directory */
325 void (*mkdir_setinfo)(struct inode *, const char *,
326 struct cifs_sb_info *, struct cifs_tcon *,
328 /* remove directory */
329 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
330 struct cifs_sb_info *);
332 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
333 struct cifs_sb_info *);
334 /* open, rename and delete file */
335 int (*rename_pending_delete)(const char *, struct dentry *,
337 /* send rename request */
338 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
339 const char *, struct cifs_sb_info *);
340 /* send create hardlink request */
341 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
342 const char *, const char *,
343 struct cifs_sb_info *);
344 /* query symlink target */
345 int (*query_symlink)(const unsigned int, struct cifs_tcon *,
346 struct cifs_sb_info *, const char *,
348 /* open a file for non-posix mounts */
349 int (*open)(const unsigned int, struct cifs_open_parms *,
350 __u32 *, FILE_ALL_INFO *);
351 /* set fid protocol-specific info */
352 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
354 void (*close)(const unsigned int, struct cifs_tcon *,
356 /* close a file, returning file attributes and timestamps */
357 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
358 struct cifsFileInfo *pfile_info);
359 /* send a flush request to the server */
360 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
361 /* async read from the server */
362 int (*async_readv)(struct cifs_readdata *);
363 /* async write to the server */
364 int (*async_writev)(struct cifs_writedata *,
365 void (*release)(struct kref *));
366 /* sync read from the server */
367 int (*sync_read)(const unsigned int, struct cifs_fid *,
368 struct cifs_io_parms *, unsigned int *, char **,
370 /* sync write to the server */
371 int (*sync_write)(const unsigned int, struct cifs_fid *,
372 struct cifs_io_parms *, unsigned int *, struct kvec *,
374 /* open dir, start readdir */
375 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
376 const char *, struct cifs_sb_info *,
377 struct cifs_fid *, __u16,
378 struct cifs_search_info *);
379 /* continue readdir */
380 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
382 __u16, struct cifs_search_info *srch_inf);
384 int (*close_dir)(const unsigned int, struct cifs_tcon *,
386 /* calculate a size of SMB message */
387 unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
388 /* check for STATUS_PENDING and process the response if yes */
389 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
390 /* check for STATUS_NETWORK_SESSION_EXPIRED */
391 bool (*is_session_expired)(char *);
392 /* send oplock break response */
393 int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
394 struct cifsInodeInfo *);
395 /* query remote filesystem */
396 int (*queryfs)(const unsigned int, struct cifs_tcon *,
397 struct cifs_sb_info *, struct kstatfs *);
398 /* send mandatory brlock to the server */
399 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
400 __u64, __u32, int, int, bool);
401 /* unlock range of mandatory locks */
402 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
404 /* push brlocks from the cache to the server */
405 int (*push_mand_locks)(struct cifsFileInfo *);
406 /* get lease key of the inode */
407 void (*get_lease_key)(struct inode *, struct cifs_fid *);
408 /* set lease key of the inode */
409 void (*set_lease_key)(struct inode *, struct cifs_fid *);
410 /* generate new lease key */
411 void (*new_lease_key)(struct cifs_fid *);
412 int (*generate_signingkey)(struct cifs_ses *);
413 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
414 bool allocate_crypto);
415 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
416 struct cifsFileInfo *src_file);
417 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
418 struct cifsFileInfo *src_file, void __user *);
419 int (*notify)(const unsigned int xid, struct file *pfile,
421 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
422 struct cifs_sb_info *, const unsigned char *,
423 char *, unsigned int *);
424 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
425 struct cifs_sb_info *, const unsigned char *,
426 char *, unsigned int *);
427 /* if we can do cache read operations */
428 bool (*is_read_op)(__u32);
429 /* set oplock level for the inode */
430 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
432 /* create lease context buffer for CREATE request */
433 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
434 /* parse lease context buffer and return oplock/epoch info */
435 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
436 ssize_t (*copychunk_range)(const unsigned int,
437 struct cifsFileInfo *src_file,
438 struct cifsFileInfo *target_file,
439 u64 src_off, u64 len, u64 dest_off);
440 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
441 struct cifsFileInfo *target_file, u64 src_off, u64 len,
443 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
444 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
445 const unsigned char *, const unsigned char *, char *,
446 size_t, struct cifs_sb_info *);
447 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
448 const char *, const void *, const __u16,
449 const struct nls_table *, struct cifs_sb_info *);
450 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
451 const char *, u32 *, u32);
452 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
453 const struct cifs_fid *, u32 *, u32);
454 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
456 /* writepages retry size */
457 unsigned int (*wp_retry_size)(struct inode *);
458 /* get mtu credits */
459 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
460 unsigned int *, struct cifs_credits *);
461 /* adjust previously taken mtu credits to request size */
462 int (*adjust_credits)(struct TCP_Server_Info *server,
463 struct cifs_credits *credits,
464 const unsigned int payload_size);
465 /* check if we need to issue closedir */
466 bool (*dir_needs_close)(struct cifsFileInfo *);
467 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
469 /* init transform request - used for encryption for now */
470 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
471 struct smb_rqst *, struct smb_rqst *);
472 int (*is_transform_hdr)(void *buf);
473 int (*receive_transform)(struct TCP_Server_Info *,
474 struct mid_q_entry **, char **, int *);
475 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
477 int (*next_header)(char *);
478 /* ioctl passthrough for query_info */
479 int (*ioctl_query_info)(const unsigned int xid,
480 struct cifs_tcon *tcon,
481 struct cifs_sb_info *cifs_sb,
482 __le16 *path, int is_dir,
484 /* make unix special files (block, char, fifo, socket) */
485 int (*make_node)(unsigned int xid,
487 struct dentry *dentry,
488 struct cifs_tcon *tcon,
489 const char *full_path,
491 dev_t device_number);
492 /* version specific fiemap implementation */
493 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
494 struct fiemap_extent_info *, u64, u64);
495 /* version specific llseek implementation */
496 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
497 /* Check for STATUS_IO_TIMEOUT */
498 bool (*is_status_io_timeout)(char *buf);
499 /* Check for STATUS_NETWORK_NAME_DELETED */
500 void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
503 struct smb_version_values {
504 char *version_string;
506 __u32 req_capabilities;
507 __u32 large_lock_type;
508 __u32 exclusive_lock_type;
509 __u32 shared_lock_type;
510 __u32 unlock_lock_type;
511 size_t header_preamble_size;
513 size_t max_header_size;
514 size_t read_rsp_size;
516 unsigned int cap_unix;
517 unsigned int cap_nt_find;
518 unsigned int cap_large_files;
519 __u16 signing_enabled;
520 __u16 signing_required;
521 size_t create_lease_size;
524 #define HEADER_SIZE(server) (server->vals->header_size)
525 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
528 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
529 * trying to reuse existing superblock for a new mount
531 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
532 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
533 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
534 CIFS_MOUNT_MAP_SFM_CHR | \
535 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
536 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
537 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
538 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
539 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
540 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
541 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
542 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
543 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
544 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
547 * Generic VFS superblock mount flags (s_flags) to consider when
548 * trying to reuse existing superblock for a new mount
550 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
551 SB_NODEV | SB_SYNCHRONOUS)
553 struct cifs_mnt_data {
554 struct cifs_sb_info *cifs_sb;
555 struct smb3_fs_context *ctx;
559 static inline unsigned int
560 get_rfc1002_length(void *buf)
562 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
566 inc_rfc1001_len(void *buf, int count)
568 be32_add_cpu((__be32 *)buf, count);
571 struct TCP_Server_Info {
572 struct list_head tcp_ses_list;
573 struct list_head smb_ses_list;
574 __u64 conn_id; /* connection identifier (useful for debugging) */
575 int srv_count; /* reference counter */
576 /* 15 character server name + 0x20 16th byte indicating type = srv */
577 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
578 struct smb_version_operations *ops;
579 struct smb_version_values *vals;
580 enum statusEnum tcpStatus; /* what we think the status is */
581 char *hostname; /* hostname portion of UNC string */
582 struct socket *ssocket;
583 struct sockaddr_storage dstaddr;
584 struct sockaddr_storage srcaddr; /* locally bind to this IP */
588 wait_queue_head_t response_q;
589 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
590 struct list_head pending_mid_q;
591 bool noblocksnd; /* use blocking sendmsg */
592 bool noautotune; /* do not autotune send buf sizes */
594 unsigned int credits; /* send no more requests at once */
595 unsigned int max_credits; /* can override large 32000 default at mnt */
596 unsigned int in_flight; /* number of requests on the wire to server */
597 unsigned int max_in_flight; /* max number of requests that were on wire */
598 spinlock_t req_lock; /* protect the two values above */
599 struct mutex srv_mutex;
600 struct task_struct *tsk;
601 char server_GUID[16];
603 bool sign; /* is signing enabled on this connection? */
604 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
605 bool session_estab; /* mark when very first sess is established */
606 int echo_credits; /* echo reserved slots */
607 int oplock_credits; /* oplock break reserved slots */
608 bool echoes:1; /* enable echoes */
609 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
610 u16 dialect; /* dialect index that server chose */
611 bool oplocks:1; /* enable oplocks */
612 unsigned int maxReq; /* Clients should submit no more */
613 /* than maxReq distinct unanswered SMBs to the server when using */
614 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
615 unsigned int maxBuf; /* maxBuf specifies the maximum */
616 /* message size the server can send or receive for non-raw SMBs */
617 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
618 /* when socket is setup (and during reconnect) before NegProt sent */
619 unsigned int max_rw; /* maxRw specifies the maximum */
620 /* message size the server can send or receive for */
621 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
622 unsigned int capabilities; /* selective disabling of caps by smb sess */
623 int timeAdj; /* Adjust for difference in server time zone in sec */
624 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
625 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
626 /* 16th byte of RFC1001 workstation name is always null */
627 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
628 __u32 sequence_number; /* for signing, protected by srv_mutex */
629 __u32 reconnect_instance; /* incremented on each reconnect */
630 struct session_key session_key;
631 unsigned long lstrp; /* when we got last response from this server */
632 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
633 #define CIFS_NEGFLAVOR_LANMAN 0 /* wct == 13, LANMAN */
634 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
635 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
636 char negflavor; /* NEGOTIATE response flavor */
637 /* extended security flavors that server supports */
638 bool sec_ntlmssp; /* supports NTLMSSP */
639 bool sec_kerberosu2u; /* supports U2U Kerberos */
640 bool sec_kerberos; /* supports plain Kerberos */
641 bool sec_mskerberos; /* supports legacy MS Kerberos */
642 bool large_buf; /* is current buffer large? */
643 /* use SMBD connection instead of socket */
645 /* point to the SMBD connection if RDMA is used instead of socket */
646 struct smbd_connection *smbd_conn;
647 struct delayed_work echo; /* echo ping workqueue job */
648 char *smallbuf; /* pointer to current "small" buffer */
649 char *bigbuf; /* pointer to current "big" buffer */
650 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
651 unsigned int pdu_size;
652 unsigned int total_read; /* total amount of data read in this pass */
653 atomic_t in_send; /* requests trying to send */
654 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
655 #ifdef CONFIG_CIFS_FSCACHE
656 struct fscache_cookie *fscache; /* client index cache cookie */
658 #ifdef CONFIG_CIFS_STATS2
659 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
660 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
661 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
662 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
663 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
665 unsigned int max_read;
666 unsigned int max_write;
667 unsigned int min_offload;
668 __le16 compress_algorithm;
670 /* save initital negprot hash */
671 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
672 bool posix_ext_supported;
673 struct delayed_work reconnect; /* reconnect workqueue job */
674 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
675 unsigned long echo_interval;
678 * Number of targets available for reconnect. The more targets
679 * the more tasks have to wait to let the demultiplex thread
683 bool noblockcnt; /* use non-blocking connect() */
684 bool is_channel; /* if a session channel */
685 #ifdef CONFIG_CIFS_SWN_UPCALL
686 bool use_swn_dstaddr;
687 struct sockaddr_storage swn_dstaddr;
691 struct cifs_credits {
693 unsigned int instance;
696 static inline unsigned int
697 in_flight(struct TCP_Server_Info *server)
700 spin_lock(&server->req_lock);
701 num = server->in_flight;
702 spin_unlock(&server->req_lock);
707 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
710 spin_lock(&server->req_lock);
712 spin_unlock(&server->req_lock);
713 return num >= num_credits;
717 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
720 server->ops->add_credits(server, credits, optype);
724 add_credits_and_wake_if(struct TCP_Server_Info *server,
725 const struct cifs_credits *credits, const int optype)
727 if (credits->value) {
728 server->ops->add_credits(server, credits, optype);
729 wake_up(&server->request_q);
734 set_credits(struct TCP_Server_Info *server, const int val)
736 server->ops->set_credits(server, val);
740 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
741 const unsigned int payload_size)
743 return server->ops->adjust_credits ?
744 server->ops->adjust_credits(server, credits, payload_size) : 0;
748 get_next_mid64(struct TCP_Server_Info *server)
750 return cpu_to_le64(server->ops->get_next_mid(server));
754 get_next_mid(struct TCP_Server_Info *server)
756 __u16 mid = server->ops->get_next_mid(server);
758 * The value in the SMB header should be little endian for easy
759 * on-the-wire decoding.
761 return cpu_to_le16(mid);
765 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
767 if (server->ops->revert_current_mid)
768 server->ops->revert_current_mid(server, val);
772 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
773 const struct smb2_sync_hdr *shdr)
775 unsigned int num = le16_to_cpu(shdr->CreditCharge);
777 return revert_current_mid(server, num > 0 ? num : 1);
781 get_mid(const struct smb_hdr *smb)
783 return le16_to_cpu(smb->Mid);
787 compare_mid(__u16 mid, const struct smb_hdr *smb)
789 return mid == le16_to_cpu(smb->Mid);
793 * When the server supports very large reads and writes via POSIX extensions,
794 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
795 * including the RFC1001 length.
797 * Note that this might make for "interesting" allocation problems during
798 * writeback however as we have to allocate an array of pointers for the
799 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
801 * For reads, there is a similar problem as we need to allocate an array
802 * of kvecs to handle the receive, though that should only need to be done
805 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
806 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
809 * When the server doesn't allow large posix writes, only allow a rsize/wsize
810 * of 2^17-1 minus the size of the call header. That allows for a read or
811 * write up to the maximum size described by RFC1002.
813 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
814 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
817 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
818 * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
819 * a single wsize request with a single call.
821 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
822 #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
825 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
826 * those values when posix extensions aren't in force. In actuality here, we
827 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
828 * to be ok with the extra byte even though Windows doesn't send writes that
833 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
835 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
836 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
839 * Macros to allow the TCP_Server_Info->net field and related code to drop out
840 * when CONFIG_NET_NS isn't set.
845 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
850 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
857 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
862 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
868 struct cifs_server_iface {
870 unsigned int rdma_capable : 1;
871 unsigned int rss_capable : 1;
872 struct sockaddr_storage sockaddr;
876 struct TCP_Server_Info *server;
877 __u8 signkey[SMB3_SIGN_KEY_SIZE];
881 * Session structure. One of these for each uid session with a particular host
884 struct list_head smb_ses_list;
885 struct list_head tcon_list;
886 struct cifs_tcon *tcon_ipc;
887 struct mutex session_mutex;
888 struct TCP_Server_Info *server; /* pointer to server info */
889 int ses_count; /* reference counter */
890 enum statusEnum status; /* updates protected by GlobalMid_Lock */
891 unsigned overrideSecFlg; /* if non-zero override global sec flags */
892 char *serverOS; /* name of operating system underlying server */
893 char *serverNOS; /* name of network operating system of server */
894 char *serverDomain; /* security realm of server */
895 __u64 Suid; /* remote smb uid */
896 kuid_t linux_uid; /* overriding owner of files on the mount */
897 kuid_t cred_uid; /* owner of credentials */
898 unsigned int capabilities;
899 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
900 char *user_name; /* must not be null except during init of sess
901 and after mount option parsing we fill it */
904 struct session_key auth_key;
905 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
906 enum securityEnum sectype; /* what security flavor was specified? */
907 bool sign; /* is signing required? */
908 bool need_reconnect:1; /* connection reset, uid now invalid */
910 bool binding:1; /* are we binding the session? */
912 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
913 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
914 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
915 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
917 __u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
920 * Network interfaces available on the server this session is
923 * Other channels can be opened by connecting and binding this
924 * session to interfaces from this list.
926 * iface_lock should be taken when accessing any of these fields
928 spinlock_t iface_lock;
929 struct cifs_server_iface *iface_list;
931 unsigned long iface_last_update; /* jiffies */
933 #define CIFS_MAX_CHANNELS 16
934 struct cifs_chan chans[CIFS_MAX_CHANNELS];
935 struct cifs_chan *binding_chan;
938 atomic_t chan_seq; /* round robin state */
942 * When binding a new channel, we need to access the channel which isn't fully
947 struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
950 return ses->binding_chan;
956 * Returns the server pointer of the session. When binding a new
957 * channel this returns the last channel which isn't fully established
960 * This function should be use for negprot/sess.setup codepaths. For
961 * the other requests see cifs_pick_channel().
964 struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
967 return ses->binding_chan->server;
973 cap_unix(struct cifs_ses *ses)
975 return ses->server->vals->cap_unix & ses->capabilities;
979 bool is_valid:1; /* Do we have a useable root fid */
980 bool file_all_info_is_valid:1;
982 unsigned long time; /* jiffies of when lease was taken */
983 struct kref refcount;
984 struct cifs_fid *fid;
985 struct mutex fid_mutex;
986 struct cifs_tcon *tcon;
987 struct dentry *dentry;
988 struct work_struct lease_break;
989 struct smb2_file_all_info file_all_info;
993 * there is one of these for each connection to a resource on a particular
997 struct list_head tcon_list;
999 struct list_head rlist; /* reconnect list */
1000 atomic_t num_local_opens; /* num of all opens including disconnected */
1001 atomic_t num_remote_opens; /* num of all network opens on server */
1002 struct list_head openFileList;
1003 spinlock_t open_file_lock; /* protects list above */
1004 struct cifs_ses *ses; /* pointer to session associated with */
1005 char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1006 char *nativeFileSystem;
1007 char *password; /* for share-level security */
1008 __u32 tid; /* The 4 byte tree id */
1009 __u16 Flags; /* optional support bits */
1010 enum statusEnum tidStatus;
1011 atomic_t num_smbs_sent;
1014 atomic_t num_writes;
1016 atomic_t num_flushes;
1017 atomic_t num_oplock_brks;
1019 atomic_t num_closes;
1020 atomic_t num_deletes;
1021 atomic_t num_mkdirs;
1022 atomic_t num_posixopens;
1023 atomic_t num_posixmkdirs;
1024 atomic_t num_rmdirs;
1025 atomic_t num_renames;
1026 atomic_t num_t2renames;
1027 atomic_t num_ffirst;
1029 atomic_t num_fclose;
1030 atomic_t num_hardlinks;
1031 atomic_t num_symlinks;
1033 atomic_t num_acl_get;
1034 atomic_t num_acl_set;
1037 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1038 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1042 __u64 bytes_written;
1043 spinlock_t stat_lock; /* protects the two fields above */
1044 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1045 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1046 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1047 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1048 bool pipe:1; /* set if connection to pipe share */
1049 bool print:1; /* set if connection to printer share */
1052 bool nohandlecache:1; /* if strange server resource prob can turn off */
1054 bool seal:1; /* transport encryption for this mounted share */
1055 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1056 for this mount even if server would support */
1057 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1058 bool local_lease:1; /* check leases (only) on local system not remote */
1059 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1060 bool broken_sparse_sup; /* if server or share does not support sparse */
1061 bool need_reconnect:1; /* connection reset, tid now invalid */
1062 bool need_reopen_files:1; /* need to reopen tcon file handles */
1063 bool use_resilient:1; /* use resilient instead of durable handles */
1064 bool use_persistent:1; /* use persistent instead of durable handles */
1065 bool no_lease:1; /* Do not request leases on files or directories */
1066 bool use_witness:1; /* use witness protocol */
1067 __le32 capabilities;
1069 __u32 maximal_access;
1070 __u32 vol_serial_number;
1071 __le64 vol_create_time;
1072 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1073 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1074 __u32 ss_flags; /* sector size flags */
1075 __u32 perf_sector_size; /* best sector size for perf */
1077 __u32 max_bytes_chunk;
1078 __u32 max_bytes_copy;
1079 #ifdef CONFIG_CIFS_FSCACHE
1080 u64 resource_id; /* server resource id */
1081 struct fscache_cookie *fscache; /* cookie for share */
1083 struct list_head pending_opens; /* list of incomplete opens */
1084 struct cached_fid crfid; /* Cached root fid */
1085 /* BB add field for back pointer to sb struct(s)? */
1086 #ifdef CONFIG_CIFS_DFS_UPCALL
1087 char *dfs_path; /* canonical DFS path */
1088 struct list_head ulist; /* cache update list */
1093 * This is a refcounted and timestamped container for a tcon pointer. The
1094 * container holds a tcon reference. It is considered safe to free one of
1095 * these when the tl_count goes to 0. The tl_time is the time of the last
1096 * "get" on the container.
1099 struct rb_node tl_rbnode;
1101 unsigned long tl_flags;
1102 #define TCON_LINK_MASTER 0
1103 #define TCON_LINK_PENDING 1
1104 #define TCON_LINK_IN_TREE 2
1105 unsigned long tl_time;
1107 struct cifs_tcon *tl_tcon;
1110 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1111 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1113 static inline struct cifs_tcon *
1114 tlink_tcon(struct tcon_link *tlink)
1116 return tlink->tl_tcon;
1119 static inline struct tcon_link *
1120 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1122 return cifs_sb->master_tlink;
1125 extern void cifs_put_tlink(struct tcon_link *tlink);
1127 static inline struct tcon_link *
1128 cifs_get_tlink(struct tcon_link *tlink)
1130 if (tlink && !IS_ERR(tlink))
1131 atomic_inc(&tlink->tl_count);
1135 /* This function is always expected to succeed */
1136 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1138 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1140 struct cifs_pending_open {
1141 struct list_head olist;
1142 struct tcon_link *tlink;
1147 struct cifs_deferred_close {
1148 struct list_head dlist;
1149 struct tcon_link *tlink;
1151 __u64 persistent_fid;
1156 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1157 * This is used to track byte stream locks on the file
1159 struct cifsLockInfo {
1160 struct list_head llist; /* pointer to next cifsLockInfo */
1161 struct list_head blist; /* pointer to locks blocked on this */
1162 wait_queue_head_t block_q;
1171 * One of these for each open instance of a file
1173 struct cifs_search_info {
1174 loff_t index_of_last_entry;
1175 __u16 entries_in_buffer;
1178 char *ntwrk_buf_start;
1179 char *srch_entries_start;
1181 const char *presume_name;
1182 unsigned int resume_name_len;
1186 bool smallBuf:1; /* so we know which buf_release function to call */
1189 #define ACL_NO_MODE ((umode_t)(-1))
1190 struct cifs_open_parms {
1191 struct cifs_tcon *tcon;
1192 struct cifs_sb_info *cifs_sb;
1197 struct cifs_fid *fid;
1204 __u64 persistent_fid; /* persist file id for smb2 */
1205 __u64 volatile_fid; /* volatile file id for smb2 */
1206 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1207 __u8 create_guid[16];
1209 struct cifs_pending_open *pending_open;
1211 #ifdef CONFIG_CIFS_DEBUG2
1213 #endif /* CIFS_DEBUG2 */
1217 struct cifs_fid_locks {
1218 struct list_head llist;
1219 struct cifsFileInfo *cfile; /* fid that owns locks */
1220 struct list_head locks; /* locks held by fid above */
1223 struct cifsFileInfo {
1224 /* following two lists are protected by tcon->open_file_lock */
1225 struct list_head tlist; /* pointer to next fid owned by tcon */
1226 struct list_head flist; /* next fid (file instance) for this inode */
1227 /* lock list below protected by cifsi->lock_sem */
1228 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1229 kuid_t uid; /* allows finding which FileInfo structure */
1230 __u32 pid; /* process id who opened file */
1231 struct cifs_fid fid; /* file id from remote */
1232 struct list_head rlist; /* reconnect list */
1233 /* BB add lock scope info here if needed */ ;
1234 /* lock scope id (0 if none) */
1235 struct dentry *dentry;
1236 struct tcon_link *tlink;
1237 unsigned int f_flags;
1238 bool invalidHandle:1; /* file closed via session abend */
1240 bool oplock_break_cancelled:1;
1241 unsigned int oplock_epoch; /* epoch from the lease break */
1242 __u32 oplock_level; /* oplock/lease level from the lease break */
1244 spinlock_t file_info_lock; /* protects four flag/count fields above */
1245 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1246 struct cifs_search_info srch_inf;
1247 struct work_struct oplock_break; /* work for oplock breaks */
1248 struct work_struct put; /* work for the final part of _put */
1249 struct delayed_work deferred;
1250 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1253 struct cifs_io_parms {
1255 __u64 persistent_fid; /* persist file id for smb2 */
1256 __u64 volatile_fid; /* volatile file id for smb2 */
1259 unsigned int length;
1260 struct cifs_tcon *tcon;
1261 struct TCP_Server_Info *server;
1264 struct cifs_aio_ctx {
1265 struct kref refcount;
1266 struct list_head list;
1267 struct mutex aio_mutex;
1268 struct completion done;
1269 struct iov_iter iter;
1271 struct cifsFileInfo *cfile;
1274 unsigned int npages;
1277 unsigned int total_len;
1280 * Indicates if this aio_ctx is for direct_io,
1281 * If yes, iter is a copy of the user passed iov_iter
1286 /* asynchronous read support */
1287 struct cifs_readdata {
1288 struct kref refcount;
1289 struct list_head list;
1290 struct completion done;
1291 struct cifsFileInfo *cfile;
1292 struct address_space *mapping;
1293 struct cifs_aio_ctx *ctx;
1296 unsigned int got_bytes;
1299 struct work_struct work;
1300 int (*read_into_pages)(struct TCP_Server_Info *server,
1301 struct cifs_readdata *rdata,
1303 int (*copy_into_pages)(struct TCP_Server_Info *server,
1304 struct cifs_readdata *rdata,
1305 struct iov_iter *iter);
1307 struct TCP_Server_Info *server;
1308 #ifdef CONFIG_CIFS_SMB_DIRECT
1311 unsigned int pagesz;
1312 unsigned int page_offset;
1313 unsigned int tailsz;
1314 struct cifs_credits credits;
1315 unsigned int nr_pages;
1316 struct page **pages;
1319 /* asynchronous write support */
1320 struct cifs_writedata {
1321 struct kref refcount;
1322 struct list_head list;
1323 struct completion done;
1324 enum writeback_sync_modes sync_mode;
1325 struct work_struct work;
1326 struct cifsFileInfo *cfile;
1327 struct cifs_aio_ctx *ctx;
1332 struct TCP_Server_Info *server;
1333 #ifdef CONFIG_CIFS_SMB_DIRECT
1336 unsigned int pagesz;
1337 unsigned int page_offset;
1338 unsigned int tailsz;
1339 struct cifs_credits credits;
1340 unsigned int nr_pages;
1341 struct page **pages;
1345 * Take a reference on the file private data. Must be called with
1346 * cfile->file_info_lock held.
1349 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1354 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1355 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1357 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1359 #define CIFS_CACHE_READ_FLG 1
1360 #define CIFS_CACHE_HANDLE_FLG 2
1361 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1362 #define CIFS_CACHE_WRITE_FLG 4
1363 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1364 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1366 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE))
1367 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1368 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->vfs_inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE))
1371 * One of these for each file inode
1374 struct cifsInodeInfo {
1375 bool can_cache_brlcks;
1376 struct list_head llist; /* locks helb by this inode */
1378 * NOTE: Some code paths call down_read(lock_sem) twice, so
1379 * we must always use cifs_down_write() instead of down_write()
1380 * for this semaphore to avoid deadlocks.
1382 struct rw_semaphore lock_sem; /* protect the fields above */
1383 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1384 struct list_head openFileList;
1385 spinlock_t open_file_lock; /* protects openFileList */
1386 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1387 unsigned int oplock; /* oplock/lease level we have */
1388 unsigned int epoch; /* used to track lease state changes */
1389 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1390 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1391 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1392 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1393 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1394 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1395 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1396 unsigned long flags;
1397 spinlock_t writers_lock;
1398 unsigned int writers; /* Number of writers on this inode */
1399 unsigned long time; /* jiffies of last update of inode */
1400 u64 server_eof; /* current file size on server -- protected by i_lock */
1401 u64 uniqueid; /* server inode number */
1402 u64 createtime; /* creation time on server */
1403 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1404 #ifdef CONFIG_CIFS_FSCACHE
1405 struct fscache_cookie *fscache;
1407 struct inode vfs_inode;
1408 struct list_head deferred_closes; /* list of deferred closes */
1409 spinlock_t deferred_lock; /* protection on deferred list */
1410 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1413 static inline struct cifsInodeInfo *
1414 CIFS_I(struct inode *inode)
1416 return container_of(inode, struct cifsInodeInfo, vfs_inode);
1419 static inline struct cifs_sb_info *
1420 CIFS_SB(struct super_block *sb)
1422 return sb->s_fs_info;
1425 static inline struct cifs_sb_info *
1426 CIFS_FILE_SB(struct file *file)
1428 return CIFS_SB(file_inode(file)->i_sb);
1431 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1440 convert_delimiter(char *path, char delim)
1442 char old_delim, *pos;
1450 while ((pos = strchr(pos, old_delim)))
1454 #define cifs_stats_inc atomic_inc
1456 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1460 spin_lock(&tcon->stat_lock);
1461 tcon->bytes_written += bytes;
1462 spin_unlock(&tcon->stat_lock);
1466 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1469 spin_lock(&tcon->stat_lock);
1470 tcon->bytes_read += bytes;
1471 spin_unlock(&tcon->stat_lock);
1476 * This is the prototype for the mid receive function. This function is for
1477 * receiving the rest of the SMB frame, starting with the WordCount (which is
1478 * just after the MID in struct smb_hdr). Note:
1480 * - This will be called by cifsd, with no locks held.
1481 * - The mid will still be on the pending_mid_q.
1482 * - mid->resp_buf will point to the current buffer.
1484 * Returns zero on a successful receive, or an error. The receive state in
1485 * the TCP_Server_Info will also be updated.
1487 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1488 struct mid_q_entry *mid);
1491 * This is the prototype for the mid callback function. This is called once the
1492 * mid has been received off of the socket. When creating one, take special
1493 * care to avoid deadlocks. Things to bear in mind:
1495 * - it will be called by cifsd, with no locks held
1496 * - the mid will be removed from any lists
1498 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1501 * This is the protopyte for mid handle function. This is called once the mid
1502 * has been recognized after decryption of the message.
1504 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1505 struct mid_q_entry *mid);
1507 /* one of these for every pending CIFS request to the server */
1508 struct mid_q_entry {
1509 struct list_head qhead; /* mids waiting on reply from this server */
1510 struct kref refcount;
1511 struct TCP_Server_Info *server; /* server corresponding to this mid */
1512 __u64 mid; /* multiplex id */
1513 __u16 credits; /* number of credits consumed by this mid */
1514 __u16 credits_received; /* number of credits from the response */
1515 __u32 pid; /* process id */
1516 __u32 sequence_number; /* for CIFS signing */
1517 unsigned long when_alloc; /* when mid was created */
1518 #ifdef CONFIG_CIFS_STATS2
1519 unsigned long when_sent; /* time when smb send finished */
1520 unsigned long when_received; /* when demux complete (taken off wire) */
1522 mid_receive_t *receive; /* call receive callback */
1523 mid_callback_t *callback; /* call completion callback */
1524 mid_handle_t *handle; /* call handle mid callback */
1525 void *callback_data; /* general purpose pointer for callback */
1526 struct task_struct *creator;
1527 void *resp_buf; /* pointer to received SMB header */
1528 unsigned int resp_buf_size;
1529 int mid_state; /* wish this were enum but can not pass to wait_event */
1530 unsigned int mid_flags;
1531 __le16 command; /* smb command code */
1532 unsigned int optype; /* operation type */
1533 bool large_buf:1; /* if valid response, is pointer to large buf */
1534 bool multiRsp:1; /* multiple trans2 responses for one request */
1535 bool multiEnd:1; /* both received */
1536 bool decrypted:1; /* decrypted entry */
1539 struct close_cancelled_open {
1540 struct cifs_fid fid;
1541 struct cifs_tcon *tcon;
1542 struct work_struct work;
1547 /* Make code in transport.c a little cleaner by moving
1548 update of optional stats into function below */
1549 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1551 atomic_inc(&server->in_send);
1554 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1556 atomic_dec(&server->in_send);
1559 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1561 atomic_inc(&server->num_waiters);
1564 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1566 atomic_dec(&server->num_waiters);
1569 #ifdef CONFIG_CIFS_STATS2
1570 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1572 mid->when_sent = jiffies;
1575 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1580 /* for pending dnotify requests */
1581 struct dir_notify_req {
1582 struct list_head lhead;
1589 __u32 filter; /* CompletionFilter (for multishot) */
1594 struct dfs_info3_param {
1595 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1605 * common struct for holding inode info when searching for or updating an
1606 * inode with new info
1609 #define CIFS_FATTR_DFS_REFERRAL 0x1
1610 #define CIFS_FATTR_DELETE_PENDING 0x2
1611 #define CIFS_FATTR_NEED_REVAL 0x4
1612 #define CIFS_FATTR_INO_COLLISION 0x8
1613 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1614 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1627 unsigned int cf_nlink;
1628 unsigned int cf_dtype;
1629 struct timespec64 cf_atime;
1630 struct timespec64 cf_mtime;
1631 struct timespec64 cf_ctime;
1635 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1638 kfree(param->path_name);
1639 kfree(param->node_name);
1643 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1644 int number_of_items)
1647 if ((number_of_items == 0) || (param == NULL))
1649 for (i = 0; i < number_of_items; i++) {
1650 kfree(param[i].path_name);
1651 kfree(param[i].node_name);
1656 static inline bool is_interrupt_error(int error)
1661 case -ERESTARTNOHAND:
1662 case -ERESTARTNOINTR:
1668 static inline bool is_retryable_error(int error)
1670 if (is_interrupt_error(error) || error == -EAGAIN)
1676 /* cifs_get_writable_file() flags */
1677 #define FIND_WR_ANY 0
1678 #define FIND_WR_FSUID_ONLY 1
1679 #define FIND_WR_WITH_DELETE 2
1682 #define MID_REQUEST_ALLOCATED 1
1683 #define MID_REQUEST_SUBMITTED 2
1684 #define MID_RESPONSE_RECEIVED 4
1685 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1686 #define MID_RESPONSE_MALFORMED 0x10
1687 #define MID_SHUTDOWN 0x20
1690 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1691 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1693 /* Types of response buffer returned from SendReceive2 */
1694 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1695 #define CIFS_SMALL_BUFFER 1
1696 #define CIFS_LARGE_BUFFER 2
1697 #define CIFS_IOVEC 4 /* array of response buffers */
1699 /* Type of Request to SendReceive2 */
1700 #define CIFS_BLOCKING_OP 1 /* operation can block */
1701 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1702 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1703 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1704 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1705 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1707 /* Type of request operation */
1708 #define CIFS_ECHO_OP 0x080 /* echo request */
1709 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1710 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1711 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1712 /* Lower bitmask values are reserved by others below. */
1713 #define CIFS_SESS_OP 0x2000 /* session setup request */
1714 #define CIFS_OP_MASK 0x2780 /* mask request type */
1716 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1717 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1718 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1720 /* Security Flags: indicate type of session setup needed */
1721 #define CIFSSEC_MAY_SIGN 0x00001
1722 #define CIFSSEC_MAY_NTLM 0x00002
1723 #define CIFSSEC_MAY_NTLMV2 0x00004
1724 #define CIFSSEC_MAY_KRB5 0x00008
1725 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1726 #define CIFSSEC_MAY_LANMAN 0x00010
1727 #define CIFSSEC_MAY_PLNTXT 0x00020
1729 #define CIFSSEC_MAY_LANMAN 0
1730 #define CIFSSEC_MAY_PLNTXT 0
1731 #endif /* weak passwords */
1732 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1733 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1735 #define CIFSSEC_MUST_SIGN 0x01001
1736 /* note that only one of the following can be set so the
1737 result of setting MUST flags more than once will be to
1738 require use of the stronger protocol */
1739 #define CIFSSEC_MUST_NTLM 0x02002
1740 #define CIFSSEC_MUST_NTLMV2 0x04004
1741 #define CIFSSEC_MUST_KRB5 0x08008
1742 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1743 #define CIFSSEC_MUST_LANMAN 0x10010
1744 #define CIFSSEC_MUST_PLNTXT 0x20020
1745 #ifdef CONFIG_CIFS_UPCALL
1746 #define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
1748 #define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
1750 #else /* do not allow weak pw hash */
1751 #define CIFSSEC_MUST_LANMAN 0
1752 #define CIFSSEC_MUST_PLNTXT 0
1753 #ifdef CONFIG_CIFS_UPCALL
1754 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1756 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1758 #endif /* WEAK_PW_HASH */
1759 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1760 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1762 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1763 #define CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1764 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1766 *****************************************************************
1767 * All constants go here
1768 *****************************************************************
1771 #define UID_HASH (16)
1774 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1775 * following to be declared.
1778 /****************************************************************************
1779 * Locking notes. All updates to global variables and lists should be
1780 * protected by spinlocks or semaphores.
1784 * GlobalMid_Lock protects:
1785 * list operations on pending_mid_q and oplockQ
1786 * updates to XID counters, multiplex id and SMB sequence numbers
1787 * list operations on global DnotifyReqList
1788 * updates to ses->status
1789 * updates to server->CurrentMid
1790 * tcp_ses_lock protects:
1791 * list operations on tcp and SMB session lists
1792 * tcon->open_file_lock protects the list of open files hanging off the tcon
1793 * inode->open_file_lock protects the openFileList hanging off the inode
1794 * cfile->file_info_lock protects counters and fields in cifs file struct
1795 * f_owner.lock protects certain per file struct operations
1796 * mapping->page_lock protects certain per page operations
1798 * Note that the cifs_tcon.open_file_lock should be taken before
1799 * not after the cifsInodeInfo.open_file_lock
1803 * cifsInodeInfo->lock_sem protects:
1804 * the list of locks held by the inode
1806 ****************************************************************************/
1808 #ifdef DECLARE_GLOBALS_HERE
1809 #define GLOBAL_EXTERN
1811 #define GLOBAL_EXTERN extern
1815 * the list of TCP_Server_Info structures, ie each of the sockets
1816 * connecting our client to a distinct server (ip address), is
1817 * chained together by cifs_tcp_ses_list. The list of all our SMB
1818 * sessions (and from that the tree connections) can be found
1819 * by iterating over cifs_tcp_ses_list
1821 GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
1824 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1825 * tcp session, and the list of tcon's per smb session. It also protects
1826 * the reference counters for the server, smb session, and tcon. It also
1827 * protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
1828 * changes to the tcon->tidStatus should be done while holding this lock.
1829 * generally the locks should be taken in order tcp_ses_lock before
1830 * tcon->open_file_lock and that before file->file_info_lock since the
1831 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1833 GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
1836 * Global transaction id (XID) information
1838 GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1839 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1840 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1841 GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
1842 /* on midQ entries */
1844 * Global counters, updated atomically
1846 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1847 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1848 GLOBAL_EXTERN atomic_t tcpSesNextId;
1849 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1850 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1851 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1853 /* Various Debug counters */
1854 GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
1855 #ifdef CONFIG_CIFS_STATS2
1856 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1857 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1858 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1860 GLOBAL_EXTERN atomic_t smBufAllocCount;
1861 GLOBAL_EXTERN atomic_t midCount;
1864 extern bool enable_oplocks; /* enable or disable oplocks */
1865 extern bool lookupCacheEnabled;
1866 extern unsigned int global_secflags; /* if on, session setup sent
1867 with more secure ntlmssp2 challenge/resp */
1868 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
1869 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
1870 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
1871 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1872 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
1873 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
1874 extern unsigned int cifs_min_small; /* min size of small buf pool */
1875 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1876 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
1878 void cifs_oplock_break(struct work_struct *work);
1879 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
1880 void smb2_deferred_work_close(struct work_struct *work);
1882 extern const struct slow_work_ops cifs_oplock_break_ops;
1883 extern struct workqueue_struct *cifsiod_wq;
1884 extern struct workqueue_struct *decrypt_wq;
1885 extern struct workqueue_struct *fileinfo_put_wq;
1886 extern struct workqueue_struct *cifsoplockd_wq;
1887 extern struct workqueue_struct *deferredclose_wq;
1888 extern __u32 cifs_lock_secret;
1890 extern mempool_t *cifs_mid_poolp;
1892 /* Operations for different SMB versions */
1893 #define SMB1_VERSION_STRING "1.0"
1894 extern struct smb_version_operations smb1_operations;
1895 extern struct smb_version_values smb1_values;
1896 #define SMB20_VERSION_STRING "2.0"
1897 extern struct smb_version_operations smb20_operations;
1898 extern struct smb_version_values smb20_values;
1899 #define SMB21_VERSION_STRING "2.1"
1900 extern struct smb_version_operations smb21_operations;
1901 extern struct smb_version_values smb21_values;
1902 #define SMBDEFAULT_VERSION_STRING "default"
1903 extern struct smb_version_values smbdefault_values;
1904 #define SMB3ANY_VERSION_STRING "3"
1905 extern struct smb_version_values smb3any_values;
1906 #define SMB30_VERSION_STRING "3.0"
1907 extern struct smb_version_operations smb30_operations;
1908 extern struct smb_version_values smb30_values;
1909 #define SMB302_VERSION_STRING "3.02"
1910 #define ALT_SMB302_VERSION_STRING "3.0.2"
1911 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1912 extern struct smb_version_values smb302_values;
1913 #define SMB311_VERSION_STRING "3.1.1"
1914 #define ALT_SMB311_VERSION_STRING "3.11"
1915 extern struct smb_version_operations smb311_operations;
1916 extern struct smb_version_values smb311_values;
1918 static inline char *get_security_type_str(enum securityEnum sectype)
1922 return "RawNTLMSSP";
1936 static inline bool is_smb1_server(struct TCP_Server_Info *server)
1938 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
1941 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
1944 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
1945 * Subsystem Notifies That a Share Is a DFS Share.
1947 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
1948 * Application Updates a Share.
1950 if (!tcon || !tcon->ses || !tcon->ses->server)
1952 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
1953 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
1956 #endif /* _CIFS_GLOB_H */