1 /* SPDX-License-Identifier: LGPL-2.1 */
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org)
13 #include <linux/in6.h>
14 #include <linux/inet.h>
15 #include <linux/slab.h>
16 #include <linux/mempool.h>
17 #include <linux/workqueue.h>
18 #include <linux/utsname.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>
24 #include "../smbfs_common/smb2pdu.h"
27 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
29 #define SMB_PATH_MAX 260
31 #define RFC1001_PORT 139
34 * The sizes of various internal tables and strings
36 #define MAX_UID_INFO 16
37 #define MAX_SES_INFO 2
38 #define MAX_TCON_INFO 4
40 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
42 #define CIFS_MIN_RCV_POOL 4
44 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */
46 * default attribute cache timeout (jiffies)
48 #define CIFS_DEF_ACTIMEO (1 * HZ)
51 * max attribute cache timeout (jiffies) - 2^30
53 #define CIFS_MAX_ACTIMEO (1 << 30)
56 * Max persistent and resilient handle timeout (milliseconds).
57 * Windows durable max was 960000 (16 minutes)
59 #define SMB3_MAX_HANDLE_TIMEOUT 960000
62 * MAX_REQ is the maximum number of requests that WE will send
63 * on one socket concurrently.
65 #define CIFS_MAX_REQ 32767
67 #define RFC1001_NAME_LEN 15
68 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
70 /* maximum length of ip addr as a string (including ipv6 and sctp) */
71 #define SERVER_NAME_LENGTH 80
72 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
74 /* echo interval in seconds */
75 #define SMB_ECHO_INTERVAL_MIN 1
76 #define SMB_ECHO_INTERVAL_MAX 600
77 #define SMB_ECHO_INTERVAL_DEFAULT 60
79 /* dns resolution intervals in seconds */
80 #define SMB_DNS_RESOLVE_INTERVAL_MIN 120
81 #define SMB_DNS_RESOLVE_INTERVAL_DEFAULT 600
83 /* maximum number of PDUs in one compound */
84 #define MAX_COMPOUND 5
87 * Default number of credits to keep available for SMB3.
88 * This value is chosen somewhat arbitrarily. The Windows client
89 * defaults to 128 credits, the Windows server allows clients up to
90 * 512 credits (or 8K for later versions), and the NetApp server
91 * does not limit clients at all. Choose a high enough default value
92 * such that the client shouldn't limit performance, but allow mount
93 * to override (until you approach 64K, where we limit credits to 65000
94 * to reduce possibility of seeing more server credit overflow bugs.
96 #define SMB2_MAX_CREDITS_AVAILABLE 32000
100 #ifndef XATTR_DOS_ATTRIB
101 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
104 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */
107 * CIFS vfs client Status information (based on what we know.)
110 /* associated with each tcp and smb session */
120 Unspecified = 0, /* not specified */
121 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
122 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
123 Kerberos, /* Kerberos via SPNEGO */
131 /* crypto security descriptor definition */
133 struct shash_desc shash;
137 /* crypto hashing related structure/fields, not specific to a sec mech */
138 struct cifs_secmech {
139 struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
140 struct crypto_shash *md5; /* md5 hash function */
141 struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
142 struct crypto_shash *cmacaes; /* block-cipher based MAC function */
143 struct crypto_shash *sha512; /* sha512 hash function */
144 struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
145 struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
146 struct sdesc *sdeschmacsha256; /* ctxt to generate smb2 signature */
147 struct sdesc *sdesccmacaes; /* ctxt to generate smb3 signature */
148 struct sdesc *sdescsha512; /* ctxt to generate smb3.11 signing key */
149 struct crypto_aead *ccmaesencrypt; /* smb3 encryption aead */
150 struct crypto_aead *ccmaesdecrypt; /* smb3 decryption aead */
153 /* per smb session structure/fields */
154 struct ntlmssp_auth {
155 bool sesskey_per_smbsess; /* whether session key is per smb session */
156 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
157 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
158 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
159 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
167 struct cifs_sid osid;
168 struct cifs_sid gsid;
169 struct cifs_ntace *ntaces;
170 struct cifs_ace *aces;
174 *****************************************************************
175 * Except the CIFS PDUs themselves all the
176 * globally interesting structs should go here
177 *****************************************************************
181 * A smb_rqst represents a complete request to be issued to a server. It's
182 * formed by a kvec array, followed by an array of pages. Page data is assumed
183 * to start at the beginning of the first page.
186 struct kvec *rq_iov; /* array of kvecs */
187 unsigned int rq_nvec; /* number of kvecs in array */
188 struct page **rq_pages; /* pointer to array of page ptrs */
189 unsigned int rq_offset; /* the offset to the 1st page */
190 unsigned int rq_npages; /* number pages in array */
191 unsigned int rq_pagesz; /* page size to use */
192 unsigned int rq_tailsz; /* length of last page */
196 struct TCP_Server_Info;
200 struct dfs_info3_param;
202 struct smb3_fs_context;
204 struct cifs_readdata;
205 struct cifs_writedata;
206 struct cifs_io_parms;
207 struct cifs_search_info;
208 struct cifsInodeInfo;
209 struct cifs_open_parms;
212 struct smb_version_operations {
213 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
214 struct mid_q_entry *);
215 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
216 /* setup request: allocate mid, sign message */
217 struct mid_q_entry *(*setup_request)(struct cifs_ses *,
218 struct TCP_Server_Info *,
220 /* setup async request: allocate mid, sign message */
221 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
223 /* check response: verify signature, map error */
224 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
226 void (*add_credits)(struct TCP_Server_Info *server,
227 const struct cifs_credits *credits,
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 void (*revert_current_mid)(struct TCP_Server_Info *server,
234 const unsigned int val);
235 /* data offset from read response message */
236 unsigned int (*read_data_offset)(char *);
238 * Data length from read response message
239 * When in_remaining is true, the returned data length is in
240 * message field DataRemaining for out-of-band data read (e.g through
241 * Memory Registration RDMA write in SMBD).
242 * Otherwise, the returned data length is in message field DataLength.
244 unsigned int (*read_data_length)(char *, bool in_remaining);
245 /* map smb to linux error */
246 int (*map_error)(char *, bool);
247 /* find mid corresponding to the response message */
248 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
249 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info);
250 void (*clear_stats)(struct cifs_tcon *);
251 void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
252 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
253 /* verify the message */
254 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
255 bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
256 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *);
257 void (*downgrade_oplock)(struct TCP_Server_Info *server,
258 struct cifsInodeInfo *cinode, __u32 oplock,
259 unsigned int epoch, bool *purge_cache);
260 /* process transaction2 response */
261 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
263 /* check if we need to negotiate */
264 bool (*need_neg)(struct TCP_Server_Info *);
265 /* negotiate to the server */
266 int (*negotiate)(const unsigned int, struct cifs_ses *);
267 /* set negotiated write size */
268 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
269 /* set negotiated read size */
270 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx);
271 /* setup smb sessionn */
272 int (*sess_setup)(const unsigned int, struct cifs_ses *,
273 const struct nls_table *);
274 /* close smb session */
275 int (*logoff)(const unsigned int, struct cifs_ses *);
276 /* connect to a server share */
277 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
278 struct cifs_tcon *, const struct nls_table *);
279 /* close tree connecion */
280 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
281 /* get DFS referrals */
282 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
283 const char *, struct dfs_info3_param **,
284 unsigned int *, const struct nls_table *, int);
285 /* informational QFS call */
286 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *,
287 struct cifs_sb_info *);
288 /* check if a path is accessible or not */
289 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
290 struct cifs_sb_info *, const char *);
291 /* query path data from the server */
292 int (*query_path_info)(const unsigned int, struct cifs_tcon *,
293 struct cifs_sb_info *, const char *,
294 FILE_ALL_INFO *, bool *, bool *);
295 /* query file data from the server */
296 int (*query_file_info)(const unsigned int, struct cifs_tcon *,
297 struct cifs_fid *, FILE_ALL_INFO *);
298 /* query reparse tag from srv to determine which type of special file */
299 int (*query_reparse_tag)(const unsigned int xid, struct cifs_tcon *tcon,
300 struct cifs_sb_info *cifs_sb, const char *path,
302 /* get server index number */
303 int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
304 struct cifs_sb_info *, const char *,
305 u64 *uniqueid, FILE_ALL_INFO *);
306 /* set size by path */
307 int (*set_path_size)(const unsigned int, struct cifs_tcon *,
308 const char *, __u64, struct cifs_sb_info *, bool);
309 /* set size by file handle */
310 int (*set_file_size)(const unsigned int, struct cifs_tcon *,
311 struct cifsFileInfo *, __u64, bool);
313 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
315 int (*set_compression)(const unsigned int, struct cifs_tcon *,
316 struct cifsFileInfo *);
317 /* check if we can send an echo or nor */
318 bool (*can_echo)(struct TCP_Server_Info *);
319 /* send echo request */
320 int (*echo)(struct TCP_Server_Info *);
321 /* create directory */
322 int (*posix_mkdir)(const unsigned int xid, struct inode *inode,
323 umode_t mode, struct cifs_tcon *tcon,
324 const char *full_path,
325 struct cifs_sb_info *cifs_sb);
326 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode,
327 struct cifs_tcon *tcon, const char *name,
328 struct cifs_sb_info *sb);
329 /* set info on created directory */
330 void (*mkdir_setinfo)(struct inode *, const char *,
331 struct cifs_sb_info *, struct cifs_tcon *,
333 /* remove directory */
334 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
335 struct cifs_sb_info *);
337 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
338 struct cifs_sb_info *);
339 /* open, rename and delete file */
340 int (*rename_pending_delete)(const char *, struct dentry *,
342 /* send rename request */
343 int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
344 const char *, struct cifs_sb_info *);
345 /* send create hardlink request */
346 int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
347 const char *, const char *,
348 struct cifs_sb_info *);
349 /* query symlink target */
350 int (*query_symlink)(const unsigned int, struct cifs_tcon *,
351 struct cifs_sb_info *, const char *,
353 /* open a file for non-posix mounts */
354 int (*open)(const unsigned int, struct cifs_open_parms *,
355 __u32 *, FILE_ALL_INFO *);
356 /* set fid protocol-specific info */
357 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
359 void (*close)(const unsigned int, struct cifs_tcon *,
361 /* close a file, returning file attributes and timestamps */
362 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon,
363 struct cifsFileInfo *pfile_info);
364 /* send a flush request to the server */
365 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
366 /* async read from the server */
367 int (*async_readv)(struct cifs_readdata *);
368 /* async write to the server */
369 int (*async_writev)(struct cifs_writedata *,
370 void (*release)(struct kref *));
371 /* sync read from the server */
372 int (*sync_read)(const unsigned int, struct cifs_fid *,
373 struct cifs_io_parms *, unsigned int *, char **,
375 /* sync write to the server */
376 int (*sync_write)(const unsigned int, struct cifs_fid *,
377 struct cifs_io_parms *, unsigned int *, struct kvec *,
379 /* open dir, start readdir */
380 int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
381 const char *, struct cifs_sb_info *,
382 struct cifs_fid *, __u16,
383 struct cifs_search_info *);
384 /* continue readdir */
385 int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
387 __u16, struct cifs_search_info *srch_inf);
389 int (*close_dir)(const unsigned int, struct cifs_tcon *,
391 /* calculate a size of SMB message */
392 unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
393 /* check for STATUS_PENDING and process the response if yes */
394 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server);
395 /* check for STATUS_NETWORK_SESSION_EXPIRED */
396 bool (*is_session_expired)(char *);
397 /* send oplock break response */
398 int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
399 struct cifsInodeInfo *);
400 /* query remote filesystem */
401 int (*queryfs)(const unsigned int, struct cifs_tcon *,
402 struct cifs_sb_info *, struct kstatfs *);
403 /* send mandatory brlock to the server */
404 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
405 __u64, __u32, int, int, bool);
406 /* unlock range of mandatory locks */
407 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
409 /* push brlocks from the cache to the server */
410 int (*push_mand_locks)(struct cifsFileInfo *);
411 /* get lease key of the inode */
412 void (*get_lease_key)(struct inode *, struct cifs_fid *);
413 /* set lease key of the inode */
414 void (*set_lease_key)(struct inode *, struct cifs_fid *);
415 /* generate new lease key */
416 void (*new_lease_key)(struct cifs_fid *);
417 int (*generate_signingkey)(struct cifs_ses *);
418 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *,
419 bool allocate_crypto);
420 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
421 struct cifsFileInfo *src_file);
422 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon,
423 struct cifsFileInfo *src_file, void __user *);
424 int (*notify)(const unsigned int xid, struct file *pfile,
426 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
427 struct cifs_sb_info *, const unsigned char *,
428 char *, unsigned int *);
429 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
430 struct cifs_sb_info *, const unsigned char *,
431 char *, unsigned int *);
432 /* if we can do cache read operations */
433 bool (*is_read_op)(__u32);
434 /* set oplock level for the inode */
435 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
437 /* create lease context buffer for CREATE request */
438 char * (*create_lease_buf)(u8 *lease_key, u8 oplock);
439 /* parse lease context buffer and return oplock/epoch info */
440 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey);
441 ssize_t (*copychunk_range)(const unsigned int,
442 struct cifsFileInfo *src_file,
443 struct cifsFileInfo *target_file,
444 u64 src_off, u64 len, u64 dest_off);
445 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
446 struct cifsFileInfo *target_file, u64 src_off, u64 len,
448 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
449 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
450 const unsigned char *, const unsigned char *, char *,
451 size_t, struct cifs_sb_info *);
452 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
453 const char *, const void *, const __u16,
454 const struct nls_table *, struct cifs_sb_info *);
455 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
456 const char *, u32 *, u32);
457 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
458 const struct cifs_fid *, u32 *, u32);
459 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
461 /* writepages retry size */
462 unsigned int (*wp_retry_size)(struct inode *);
463 /* get mtu credits */
464 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
465 unsigned int *, struct cifs_credits *);
466 /* adjust previously taken mtu credits to request size */
467 int (*adjust_credits)(struct TCP_Server_Info *server,
468 struct cifs_credits *credits,
469 const unsigned int payload_size);
470 /* check if we need to issue closedir */
471 bool (*dir_needs_close)(struct cifsFileInfo *);
472 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
474 /* init transform request - used for encryption for now */
475 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst,
476 struct smb_rqst *, struct smb_rqst *);
477 int (*is_transform_hdr)(void *buf);
478 int (*receive_transform)(struct TCP_Server_Info *,
479 struct mid_q_entry **, char **, int *);
480 enum securityEnum (*select_sectype)(struct TCP_Server_Info *,
482 int (*next_header)(char *);
483 /* ioctl passthrough for query_info */
484 int (*ioctl_query_info)(const unsigned int xid,
485 struct cifs_tcon *tcon,
486 struct cifs_sb_info *cifs_sb,
487 __le16 *path, int is_dir,
489 /* make unix special files (block, char, fifo, socket) */
490 int (*make_node)(unsigned int xid,
492 struct dentry *dentry,
493 struct cifs_tcon *tcon,
494 const char *full_path,
496 dev_t device_number);
497 /* version specific fiemap implementation */
498 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *,
499 struct fiemap_extent_info *, u64, u64);
500 /* version specific llseek implementation */
501 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int);
502 /* Check for STATUS_IO_TIMEOUT */
503 bool (*is_status_io_timeout)(char *buf);
504 /* Check for STATUS_NETWORK_NAME_DELETED */
505 void (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
508 struct smb_version_values {
509 char *version_string;
511 __u32 req_capabilities;
512 __u32 large_lock_type;
513 __u32 exclusive_lock_type;
514 __u32 shared_lock_type;
515 __u32 unlock_lock_type;
516 size_t header_preamble_size;
518 size_t max_header_size;
519 size_t read_rsp_size;
521 unsigned int cap_unix;
522 unsigned int cap_nt_find;
523 unsigned int cap_large_files;
524 __u16 signing_enabled;
525 __u16 signing_required;
526 size_t create_lease_size;
529 #define HEADER_SIZE(server) (server->vals->header_size)
530 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
533 * CIFS superblock mount flags (mnt_cifs_flags) to consider when
534 * trying to reuse existing superblock for a new mount
536 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
537 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
538 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
539 CIFS_MOUNT_MAP_SFM_CHR | \
540 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
541 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
542 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
543 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
544 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
545 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
546 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \
547 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \
548 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \
549 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE)
552 * Generic VFS superblock mount flags (s_flags) to consider when
553 * trying to reuse existing superblock for a new mount
555 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \
556 SB_NODEV | SB_SYNCHRONOUS)
558 struct cifs_mnt_data {
559 struct cifs_sb_info *cifs_sb;
560 struct smb3_fs_context *ctx;
564 static inline unsigned int
565 get_rfc1002_length(void *buf)
567 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
571 inc_rfc1001_len(void *buf, int count)
573 be32_add_cpu((__be32 *)buf, count);
576 struct TCP_Server_Info {
577 struct list_head tcp_ses_list;
578 struct list_head smb_ses_list;
579 __u64 conn_id; /* connection identifier (useful for debugging) */
580 int srv_count; /* reference counter */
581 /* 15 character server name + 0x20 16th byte indicating type = srv */
582 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
583 struct smb_version_operations *ops;
584 struct smb_version_values *vals;
585 /* updates to tcpStatus protected by GlobalMid_Lock */
586 enum statusEnum tcpStatus; /* what we think the status is */
587 char *hostname; /* hostname portion of UNC string */
588 struct socket *ssocket;
589 struct sockaddr_storage dstaddr;
590 struct sockaddr_storage srcaddr; /* locally bind to this IP */
594 wait_queue_head_t response_q;
595 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
596 struct list_head pending_mid_q;
597 bool noblocksnd; /* use blocking sendmsg */
598 bool noautotune; /* do not autotune send buf sizes */
601 unsigned int credits; /* send no more requests at once */
602 unsigned int max_credits; /* can override large 32000 default at mnt */
603 unsigned int in_flight; /* number of requests on the wire to server */
604 unsigned int max_in_flight; /* max number of requests that were on wire */
605 spinlock_t req_lock; /* protect the two values above */
606 struct mutex srv_mutex;
607 struct task_struct *tsk;
608 char server_GUID[16];
610 bool sign; /* is signing enabled on this connection? */
611 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */
612 bool session_estab; /* mark when very first sess is established */
613 int echo_credits; /* echo reserved slots */
614 int oplock_credits; /* oplock break reserved slots */
615 bool echoes:1; /* enable echoes */
616 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
617 u16 dialect; /* dialect index that server chose */
618 bool oplocks:1; /* enable oplocks */
619 unsigned int maxReq; /* Clients should submit no more */
620 /* than maxReq distinct unanswered SMBs to the server when using */
621 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */
622 unsigned int maxBuf; /* maxBuf specifies the maximum */
623 /* message size the server can send or receive for non-raw SMBs */
624 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
625 /* when socket is setup (and during reconnect) before NegProt sent */
626 unsigned int max_rw; /* maxRw specifies the maximum */
627 /* message size the server can send or receive for */
628 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
629 unsigned int capabilities; /* selective disabling of caps by smb sess */
630 int timeAdj; /* Adjust for difference in server time zone in sec */
631 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */
632 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
633 /* 16th byte of RFC1001 workstation name is always null */
634 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
635 __u32 sequence_number; /* for signing, protected by srv_mutex */
636 __u32 reconnect_instance; /* incremented on each reconnect */
637 struct session_key session_key;
638 unsigned long lstrp; /* when we got last response from this server */
639 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
640 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
641 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
642 char negflavor; /* NEGOTIATE response flavor */
643 /* extended security flavors that server supports */
644 bool sec_ntlmssp; /* supports NTLMSSP */
645 bool sec_kerberosu2u; /* supports U2U Kerberos */
646 bool sec_kerberos; /* supports plain Kerberos */
647 bool sec_mskerberos; /* supports legacy MS Kerberos */
648 bool large_buf; /* is current buffer large? */
649 /* use SMBD connection instead of socket */
651 /* point to the SMBD connection if RDMA is used instead of socket */
652 struct smbd_connection *smbd_conn;
653 struct delayed_work echo; /* echo ping workqueue job */
654 struct delayed_work resolve; /* dns resolution workqueue job */
655 char *smallbuf; /* pointer to current "small" buffer */
656 char *bigbuf; /* pointer to current "big" buffer */
657 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */
658 unsigned int pdu_size;
659 unsigned int total_read; /* total amount of data read in this pass */
660 atomic_t in_send; /* requests trying to send */
661 atomic_t num_waiters; /* blocked waiting to get in sendrecv */
662 #ifdef CONFIG_CIFS_FSCACHE
663 struct fscache_cookie *fscache; /* client index cache cookie */
665 #ifdef CONFIG_CIFS_STATS2
666 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
667 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
668 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */
669 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS];
670 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS];
672 unsigned int max_read;
673 unsigned int max_write;
674 unsigned int min_offload;
675 __le16 compress_algorithm;
676 __u16 signing_algorithm;
678 /* save initital negprot hash */
679 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
680 bool signing_negotiated; /* true if valid signing context rcvd from server */
681 bool posix_ext_supported;
682 struct delayed_work reconnect; /* reconnect workqueue job */
683 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
684 unsigned long echo_interval;
687 * Number of targets available for reconnect. The more targets
688 * the more tasks have to wait to let the demultiplex thread
692 bool noblockcnt; /* use non-blocking connect() */
693 bool is_channel; /* if a session channel */
694 #ifdef CONFIG_CIFS_SWN_UPCALL
695 bool use_swn_dstaddr;
696 struct sockaddr_storage swn_dstaddr;
698 #ifdef CONFIG_CIFS_DFS_UPCALL
699 bool is_dfs_conn; /* if a dfs connection */
703 struct cifs_credits {
705 unsigned int instance;
708 static inline unsigned int
709 in_flight(struct TCP_Server_Info *server)
712 spin_lock(&server->req_lock);
713 num = server->in_flight;
714 spin_unlock(&server->req_lock);
719 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits)
722 spin_lock(&server->req_lock);
724 spin_unlock(&server->req_lock);
725 return num >= num_credits;
729 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits,
732 server->ops->add_credits(server, credits, optype);
736 add_credits_and_wake_if(struct TCP_Server_Info *server,
737 const struct cifs_credits *credits, const int optype)
739 if (credits->value) {
740 server->ops->add_credits(server, credits, optype);
741 wake_up(&server->request_q);
746 set_credits(struct TCP_Server_Info *server, const int val)
748 server->ops->set_credits(server, val);
752 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits,
753 const unsigned int payload_size)
755 return server->ops->adjust_credits ?
756 server->ops->adjust_credits(server, credits, payload_size) : 0;
760 get_next_mid64(struct TCP_Server_Info *server)
762 return cpu_to_le64(server->ops->get_next_mid(server));
766 get_next_mid(struct TCP_Server_Info *server)
768 __u16 mid = server->ops->get_next_mid(server);
770 * The value in the SMB header should be little endian for easy
771 * on-the-wire decoding.
773 return cpu_to_le16(mid);
777 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
779 if (server->ops->revert_current_mid)
780 server->ops->revert_current_mid(server, val);
784 revert_current_mid_from_hdr(struct TCP_Server_Info *server,
785 const struct smb2_hdr *shdr)
787 unsigned int num = le16_to_cpu(shdr->CreditCharge);
789 return revert_current_mid(server, num > 0 ? num : 1);
793 get_mid(const struct smb_hdr *smb)
795 return le16_to_cpu(smb->Mid);
799 compare_mid(__u16 mid, const struct smb_hdr *smb)
801 return mid == le16_to_cpu(smb->Mid);
805 * When the server supports very large reads and writes via POSIX extensions,
806 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
807 * including the RFC1001 length.
809 * Note that this might make for "interesting" allocation problems during
810 * writeback however as we have to allocate an array of pointers for the
811 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
813 * For reads, there is a similar problem as we need to allocate an array
814 * of kvecs to handle the receive, though that should only need to be done
817 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
818 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
821 * When the server doesn't allow large posix writes, only allow a rsize/wsize
822 * of 2^17-1 minus the size of the call header. That allows for a read or
823 * write up to the maximum size described by RFC1002.
825 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
826 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
829 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
830 * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
831 * a single wsize request with a single call.
833 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
834 #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
837 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
838 * those values when posix extensions aren't in force. In actuality here, we
839 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
840 * to be ok with the extra byte even though Windows doesn't send writes that
845 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
847 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
848 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
851 * Macros to allow the TCP_Server_Info->net field and related code to drop out
852 * when CONFIG_NET_NS isn't set.
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)
869 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
874 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
880 struct cifs_server_iface {
882 unsigned int rdma_capable : 1;
883 unsigned int rss_capable : 1;
884 struct sockaddr_storage sockaddr;
888 struct TCP_Server_Info *server;
889 __u8 signkey[SMB3_SIGN_KEY_SIZE];
893 * Session structure. One of these for each uid session with a particular host
896 struct list_head smb_ses_list;
897 struct list_head tcon_list;
898 struct cifs_tcon *tcon_ipc;
899 struct mutex session_mutex;
900 struct TCP_Server_Info *server; /* pointer to server info */
901 int ses_count; /* reference counter */
902 enum statusEnum status; /* updates protected by GlobalMid_Lock */
903 unsigned overrideSecFlg; /* if non-zero override global sec flags */
904 char *serverOS; /* name of operating system underlying server */
905 char *serverNOS; /* name of network operating system of server */
906 char *serverDomain; /* security realm of server */
907 __u64 Suid; /* remote smb uid */
908 kuid_t linux_uid; /* overriding owner of files on the mount */
909 kuid_t cred_uid; /* owner of credentials */
910 unsigned int capabilities;
911 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */
912 char *user_name; /* must not be null except during init of sess
913 and after mount option parsing we fill it */
916 char *workstation_name;
917 struct session_key auth_key;
918 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
919 enum securityEnum sectype; /* what security flavor was specified? */
920 bool sign; /* is signing required? */
921 bool need_reconnect:1; /* connection reset, uid now invalid */
923 bool binding:1; /* are we binding the session? */
925 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
926 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE];
927 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];
928 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
930 __u8 binding_preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE];
933 * Network interfaces available on the server this session is
936 * Other channels can be opened by connecting and binding this
937 * session to interfaces from this list.
939 * iface_lock should be taken when accessing any of these fields
941 spinlock_t iface_lock;
942 struct cifs_server_iface *iface_list;
944 unsigned long iface_last_update; /* jiffies */
946 #define CIFS_MAX_CHANNELS 16
947 struct cifs_chan chans[CIFS_MAX_CHANNELS];
948 struct cifs_chan *binding_chan;
951 atomic_t chan_seq; /* round robin state */
955 * When binding a new channel, we need to access the channel which isn't fully
960 struct cifs_chan *cifs_ses_binding_channel(struct cifs_ses *ses)
963 return ses->binding_chan;
969 * Returns the server pointer of the session. When binding a new
970 * channel this returns the last channel which isn't fully established
973 * This function should be use for negprot/sess.setup codepaths. For
974 * the other requests see cifs_pick_channel().
977 struct TCP_Server_Info *cifs_ses_server(struct cifs_ses *ses)
980 return ses->binding_chan->server;
986 cap_unix(struct cifs_ses *ses)
988 return ses->server->vals->cap_unix & ses->capabilities;
992 bool is_valid:1; /* Do we have a useable root fid */
993 bool file_all_info_is_valid:1;
995 unsigned long time; /* jiffies of when lease was taken */
996 struct kref refcount;
997 struct cifs_fid *fid;
998 struct mutex fid_mutex;
999 struct cifs_tcon *tcon;
1000 struct dentry *dentry;
1001 struct work_struct lease_break;
1002 struct smb2_file_all_info file_all_info;
1006 * there is one of these for each connection to a resource on a particular
1010 struct list_head tcon_list;
1012 struct list_head rlist; /* reconnect list */
1013 atomic_t num_local_opens; /* num of all opens including disconnected */
1014 atomic_t num_remote_opens; /* num of all network opens on server */
1015 struct list_head openFileList;
1016 spinlock_t open_file_lock; /* protects list above */
1017 struct cifs_ses *ses; /* pointer to session associated with */
1018 char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
1019 char *nativeFileSystem;
1020 char *password; /* for share-level security */
1021 __u32 tid; /* The 4 byte tree id */
1022 __u16 Flags; /* optional support bits */
1023 enum statusEnum tidStatus;
1024 atomic_t num_smbs_sent;
1027 atomic_t num_writes;
1029 atomic_t num_flushes;
1030 atomic_t num_oplock_brks;
1032 atomic_t num_closes;
1033 atomic_t num_deletes;
1034 atomic_t num_mkdirs;
1035 atomic_t num_posixopens;
1036 atomic_t num_posixmkdirs;
1037 atomic_t num_rmdirs;
1038 atomic_t num_renames;
1039 atomic_t num_t2renames;
1040 atomic_t num_ffirst;
1042 atomic_t num_fclose;
1043 atomic_t num_hardlinks;
1044 atomic_t num_symlinks;
1046 atomic_t num_acl_get;
1047 atomic_t num_acl_set;
1050 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
1051 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
1055 __u64 bytes_written;
1056 spinlock_t stat_lock; /* protects the two fields above */
1057 FILE_SYSTEM_DEVICE_INFO fsDevInfo;
1058 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
1059 FILE_SYSTEM_UNIX_INFO fsUnixInfo;
1060 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */
1061 bool pipe:1; /* set if connection to pipe share */
1062 bool print:1; /* set if connection to printer share */
1065 bool nohandlecache:1; /* if strange server resource prob can turn off */
1067 bool seal:1; /* transport encryption for this mounted share */
1068 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
1069 for this mount even if server would support */
1070 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */
1071 bool local_lease:1; /* check leases (only) on local system not remote */
1072 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
1073 bool broken_sparse_sup; /* if server or share does not support sparse */
1074 bool need_reconnect:1; /* connection reset, tid now invalid */
1075 bool need_reopen_files:1; /* need to reopen tcon file handles */
1076 bool use_resilient:1; /* use resilient instead of durable handles */
1077 bool use_persistent:1; /* use persistent instead of durable handles */
1078 bool no_lease:1; /* Do not request leases on files or directories */
1079 bool use_witness:1; /* use witness protocol */
1080 __le32 capabilities;
1082 __u32 maximal_access;
1083 __u32 vol_serial_number;
1084 __le64 vol_create_time;
1085 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */
1086 __u32 handle_timeout; /* persistent and durable handle timeout in ms */
1087 __u32 ss_flags; /* sector size flags */
1088 __u32 perf_sector_size; /* best sector size for perf */
1090 __u32 max_bytes_chunk;
1091 __u32 max_bytes_copy;
1092 #ifdef CONFIG_CIFS_FSCACHE
1093 u64 resource_id; /* server resource id */
1094 struct fscache_cookie *fscache; /* cookie for share */
1096 struct list_head pending_opens; /* list of incomplete opens */
1097 struct cached_fid crfid; /* Cached root fid */
1098 /* BB add field for back pointer to sb struct(s)? */
1099 #ifdef CONFIG_CIFS_DFS_UPCALL
1100 char *dfs_path; /* canonical DFS path */
1101 struct list_head ulist; /* cache update list */
1106 * This is a refcounted and timestamped container for a tcon pointer. The
1107 * container holds a tcon reference. It is considered safe to free one of
1108 * these when the tl_count goes to 0. The tl_time is the time of the last
1109 * "get" on the container.
1112 struct rb_node tl_rbnode;
1114 unsigned long tl_flags;
1115 #define TCON_LINK_MASTER 0
1116 #define TCON_LINK_PENDING 1
1117 #define TCON_LINK_IN_TREE 2
1118 unsigned long tl_time;
1120 struct cifs_tcon *tl_tcon;
1123 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
1124 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst);
1126 static inline struct cifs_tcon *
1127 tlink_tcon(struct tcon_link *tlink)
1129 return tlink->tl_tcon;
1132 static inline struct tcon_link *
1133 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
1135 return cifs_sb->master_tlink;
1138 extern void cifs_put_tlink(struct tcon_link *tlink);
1140 static inline struct tcon_link *
1141 cifs_get_tlink(struct tcon_link *tlink)
1143 if (tlink && !IS_ERR(tlink))
1144 atomic_inc(&tlink->tl_count);
1148 /* This function is always expected to succeed */
1149 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
1151 #define CIFS_OPLOCK_NO_CHANGE 0xfe
1153 struct cifs_pending_open {
1154 struct list_head olist;
1155 struct tcon_link *tlink;
1160 struct cifs_deferred_close {
1161 struct list_head dlist;
1162 struct tcon_link *tlink;
1164 __u64 persistent_fid;
1169 * This info hangs off the cifsFileInfo structure, pointed to by llist.
1170 * This is used to track byte stream locks on the file
1172 struct cifsLockInfo {
1173 struct list_head llist; /* pointer to next cifsLockInfo */
1174 struct list_head blist; /* pointer to locks blocked on this */
1175 wait_queue_head_t block_q;
1184 * One of these for each open instance of a file
1186 struct cifs_search_info {
1187 loff_t index_of_last_entry;
1188 __u16 entries_in_buffer;
1191 char *ntwrk_buf_start;
1192 char *srch_entries_start;
1194 const char *presume_name;
1195 unsigned int resume_name_len;
1199 bool smallBuf:1; /* so we know which buf_release function to call */
1202 #define ACL_NO_MODE ((umode_t)(-1))
1203 struct cifs_open_parms {
1204 struct cifs_tcon *tcon;
1205 struct cifs_sb_info *cifs_sb;
1210 struct cifs_fid *fid;
1217 __u64 persistent_fid; /* persist file id for smb2 */
1218 __u64 volatile_fid; /* volatile file id for smb2 */
1219 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
1220 __u8 create_guid[16];
1222 struct cifs_pending_open *pending_open;
1224 #ifdef CONFIG_CIFS_DEBUG2
1226 #endif /* CIFS_DEBUG2 */
1230 struct cifs_fid_locks {
1231 struct list_head llist;
1232 struct cifsFileInfo *cfile; /* fid that owns locks */
1233 struct list_head locks; /* locks held by fid above */
1236 struct cifsFileInfo {
1237 /* following two lists are protected by tcon->open_file_lock */
1238 struct list_head tlist; /* pointer to next fid owned by tcon */
1239 struct list_head flist; /* next fid (file instance) for this inode */
1240 /* lock list below protected by cifsi->lock_sem */
1241 struct cifs_fid_locks *llist; /* brlocks held by this fid */
1242 kuid_t uid; /* allows finding which FileInfo structure */
1243 __u32 pid; /* process id who opened file */
1244 struct cifs_fid fid; /* file id from remote */
1245 struct list_head rlist; /* reconnect list */
1246 /* BB add lock scope info here if needed */ ;
1247 /* lock scope id (0 if none) */
1248 struct dentry *dentry;
1249 struct tcon_link *tlink;
1250 unsigned int f_flags;
1251 bool invalidHandle:1; /* file closed via session abend */
1253 bool oplock_break_cancelled:1;
1254 unsigned int oplock_epoch; /* epoch from the lease break */
1255 __u32 oplock_level; /* oplock/lease level from the lease break */
1257 spinlock_t file_info_lock; /* protects four flag/count fields above */
1258 struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1259 struct cifs_search_info srch_inf;
1260 struct work_struct oplock_break; /* work for oplock breaks */
1261 struct work_struct put; /* work for the final part of _put */
1262 struct delayed_work deferred;
1263 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */
1266 struct cifs_io_parms {
1268 __u64 persistent_fid; /* persist file id for smb2 */
1269 __u64 volatile_fid; /* volatile file id for smb2 */
1272 unsigned int length;
1273 struct cifs_tcon *tcon;
1274 struct TCP_Server_Info *server;
1277 struct cifs_aio_ctx {
1278 struct kref refcount;
1279 struct list_head list;
1280 struct mutex aio_mutex;
1281 struct completion done;
1282 struct iov_iter iter;
1284 struct cifsFileInfo *cfile;
1287 unsigned int npages;
1290 unsigned int total_len;
1293 * Indicates if this aio_ctx is for direct_io,
1294 * If yes, iter is a copy of the user passed iov_iter
1299 /* asynchronous read support */
1300 struct cifs_readdata {
1301 struct kref refcount;
1302 struct list_head list;
1303 struct completion done;
1304 struct cifsFileInfo *cfile;
1305 struct address_space *mapping;
1306 struct cifs_aio_ctx *ctx;
1309 unsigned int got_bytes;
1312 struct work_struct work;
1313 int (*read_into_pages)(struct TCP_Server_Info *server,
1314 struct cifs_readdata *rdata,
1316 int (*copy_into_pages)(struct TCP_Server_Info *server,
1317 struct cifs_readdata *rdata,
1318 struct iov_iter *iter);
1320 struct TCP_Server_Info *server;
1321 #ifdef CONFIG_CIFS_SMB_DIRECT
1324 unsigned int pagesz;
1325 unsigned int page_offset;
1326 unsigned int tailsz;
1327 struct cifs_credits credits;
1328 unsigned int nr_pages;
1329 struct page **pages;
1332 /* asynchronous write support */
1333 struct cifs_writedata {
1334 struct kref refcount;
1335 struct list_head list;
1336 struct completion done;
1337 enum writeback_sync_modes sync_mode;
1338 struct work_struct work;
1339 struct cifsFileInfo *cfile;
1340 struct cifs_aio_ctx *ctx;
1345 struct TCP_Server_Info *server;
1346 #ifdef CONFIG_CIFS_SMB_DIRECT
1349 unsigned int pagesz;
1350 unsigned int page_offset;
1351 unsigned int tailsz;
1352 struct cifs_credits credits;
1353 unsigned int nr_pages;
1354 struct page **pages;
1358 * Take a reference on the file private data. Must be called with
1359 * cfile->file_info_lock held.
1362 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1367 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1368 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr,
1370 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1372 #define CIFS_CACHE_READ_FLG 1
1373 #define CIFS_CACHE_HANDLE_FLG 2
1374 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1375 #define CIFS_CACHE_WRITE_FLG 4
1376 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1377 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1379 #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))
1380 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1381 #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))
1384 * One of these for each file inode
1387 struct cifsInodeInfo {
1388 bool can_cache_brlcks;
1389 struct list_head llist; /* locks helb by this inode */
1391 * NOTE: Some code paths call down_read(lock_sem) twice, so
1392 * we must always use cifs_down_write() instead of down_write()
1393 * for this semaphore to avoid deadlocks.
1395 struct rw_semaphore lock_sem; /* protect the fields above */
1396 /* BB add in lists for dirty pages i.e. write caching info for oplock */
1397 struct list_head openFileList;
1398 spinlock_t open_file_lock; /* protects openFileList */
1399 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1400 unsigned int oplock; /* oplock/lease level we have */
1401 unsigned int epoch; /* used to track lease state changes */
1402 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */
1403 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */
1404 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */
1405 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */
1406 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */
1407 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */
1408 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */
1409 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */
1410 unsigned long flags;
1411 spinlock_t writers_lock;
1412 unsigned int writers; /* Number of writers on this inode */
1413 unsigned long time; /* jiffies of last update of inode */
1414 u64 server_eof; /* current file size on server -- protected by i_lock */
1415 u64 uniqueid; /* server inode number */
1416 u64 createtime; /* creation time on server */
1417 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */
1418 #ifdef CONFIG_CIFS_FSCACHE
1419 struct fscache_cookie *fscache;
1421 struct inode vfs_inode;
1422 struct list_head deferred_closes; /* list of deferred closes */
1423 spinlock_t deferred_lock; /* protection on deferred list */
1424 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */
1427 static inline struct cifsInodeInfo *
1428 CIFS_I(struct inode *inode)
1430 return container_of(inode, struct cifsInodeInfo, vfs_inode);
1433 static inline struct cifs_sb_info *
1434 CIFS_SB(struct super_block *sb)
1436 return sb->s_fs_info;
1439 static inline struct cifs_sb_info *
1440 CIFS_FILE_SB(struct file *file)
1442 return CIFS_SB(file_inode(file)->i_sb);
1445 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1447 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1454 convert_delimiter(char *path, char delim)
1456 char old_delim, *pos;
1464 while ((pos = strchr(pos, old_delim)))
1468 #define cifs_stats_inc atomic_inc
1470 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1474 spin_lock(&tcon->stat_lock);
1475 tcon->bytes_written += bytes;
1476 spin_unlock(&tcon->stat_lock);
1480 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1483 spin_lock(&tcon->stat_lock);
1484 tcon->bytes_read += bytes;
1485 spin_unlock(&tcon->stat_lock);
1490 * This is the prototype for the mid receive function. This function is for
1491 * receiving the rest of the SMB frame, starting with the WordCount (which is
1492 * just after the MID in struct smb_hdr). Note:
1494 * - This will be called by cifsd, with no locks held.
1495 * - The mid will still be on the pending_mid_q.
1496 * - mid->resp_buf will point to the current buffer.
1498 * Returns zero on a successful receive, or an error. The receive state in
1499 * the TCP_Server_Info will also be updated.
1501 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1502 struct mid_q_entry *mid);
1505 * This is the prototype for the mid callback function. This is called once the
1506 * mid has been received off of the socket. When creating one, take special
1507 * care to avoid deadlocks. Things to bear in mind:
1509 * - it will be called by cifsd, with no locks held
1510 * - the mid will be removed from any lists
1512 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1515 * This is the protopyte for mid handle function. This is called once the mid
1516 * has been recognized after decryption of the message.
1518 typedef int (mid_handle_t)(struct TCP_Server_Info *server,
1519 struct mid_q_entry *mid);
1521 /* one of these for every pending CIFS request to the server */
1522 struct mid_q_entry {
1523 struct list_head qhead; /* mids waiting on reply from this server */
1524 struct kref refcount;
1525 struct TCP_Server_Info *server; /* server corresponding to this mid */
1526 __u64 mid; /* multiplex id */
1527 __u16 credits; /* number of credits consumed by this mid */
1528 __u16 credits_received; /* number of credits from the response */
1529 __u32 pid; /* process id */
1530 __u32 sequence_number; /* for CIFS signing */
1531 unsigned long when_alloc; /* when mid was created */
1532 #ifdef CONFIG_CIFS_STATS2
1533 unsigned long when_sent; /* time when smb send finished */
1534 unsigned long when_received; /* when demux complete (taken off wire) */
1536 mid_receive_t *receive; /* call receive callback */
1537 mid_callback_t *callback; /* call completion callback */
1538 mid_handle_t *handle; /* call handle mid callback */
1539 void *callback_data; /* general purpose pointer for callback */
1540 struct task_struct *creator;
1541 void *resp_buf; /* pointer to received SMB header */
1542 unsigned int resp_buf_size;
1543 int mid_state; /* wish this were enum but can not pass to wait_event */
1544 unsigned int mid_flags;
1545 __le16 command; /* smb command code */
1546 unsigned int optype; /* operation type */
1547 bool large_buf:1; /* if valid response, is pointer to large buf */
1548 bool multiRsp:1; /* multiple trans2 responses for one request */
1549 bool multiEnd:1; /* both received */
1550 bool decrypted:1; /* decrypted entry */
1553 struct close_cancelled_open {
1554 struct cifs_fid fid;
1555 struct cifs_tcon *tcon;
1556 struct work_struct work;
1561 /* Make code in transport.c a little cleaner by moving
1562 update of optional stats into function below */
1563 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1565 atomic_inc(&server->in_send);
1568 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1570 atomic_dec(&server->in_send);
1573 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1575 atomic_inc(&server->num_waiters);
1578 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1580 atomic_dec(&server->num_waiters);
1583 #ifdef CONFIG_CIFS_STATS2
1584 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1586 mid->when_sent = jiffies;
1589 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1594 /* for pending dnotify requests */
1595 struct dir_notify_req {
1596 struct list_head lhead;
1603 __u32 filter; /* CompletionFilter (for multishot) */
1608 struct dfs_info3_param {
1609 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1619 struct list_head list;
1620 struct cifsFileInfo *cfile;
1624 * common struct for holding inode info when searching for or updating an
1625 * inode with new info
1628 #define CIFS_FATTR_DFS_REFERRAL 0x1
1629 #define CIFS_FATTR_DELETE_PENDING 0x2
1630 #define CIFS_FATTR_NEED_REVAL 0x4
1631 #define CIFS_FATTR_INO_COLLISION 0x8
1632 #define CIFS_FATTR_UNKNOWN_NLINK 0x10
1633 #define CIFS_FATTR_FAKE_ROOT_INO 0x20
1646 unsigned int cf_nlink;
1647 unsigned int cf_dtype;
1648 struct timespec64 cf_atime;
1649 struct timespec64 cf_mtime;
1650 struct timespec64 cf_ctime;
1654 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1657 kfree(param->path_name);
1658 kfree(param->node_name);
1662 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1663 int number_of_items)
1666 if ((number_of_items == 0) || (param == NULL))
1668 for (i = 0; i < number_of_items; i++) {
1669 kfree(param[i].path_name);
1670 kfree(param[i].node_name);
1675 static inline bool is_interrupt_error(int error)
1680 case -ERESTARTNOHAND:
1681 case -ERESTARTNOINTR:
1687 static inline bool is_retryable_error(int error)
1689 if (is_interrupt_error(error) || error == -EAGAIN)
1695 /* cifs_get_writable_file() flags */
1696 #define FIND_WR_ANY 0
1697 #define FIND_WR_FSUID_ONLY 1
1698 #define FIND_WR_WITH_DELETE 2
1701 #define MID_REQUEST_ALLOCATED 1
1702 #define MID_REQUEST_SUBMITTED 2
1703 #define MID_RESPONSE_RECEIVED 4
1704 #define MID_RETRY_NEEDED 8 /* session closed while this request out */
1705 #define MID_RESPONSE_MALFORMED 0x10
1706 #define MID_SHUTDOWN 0x20
1709 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */
1710 #define MID_DELETED 2 /* Mid has been dequeued/deleted */
1712 /* Types of response buffer returned from SendReceive2 */
1713 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */
1714 #define CIFS_SMALL_BUFFER 1
1715 #define CIFS_LARGE_BUFFER 2
1716 #define CIFS_IOVEC 4 /* array of response buffers */
1718 /* Type of Request to SendReceive2 */
1719 #define CIFS_BLOCKING_OP 1 /* operation can block */
1720 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */
1721 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
1722 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
1723 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
1724 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */
1726 /* Type of request operation */
1727 #define CIFS_ECHO_OP 0x080 /* echo request */
1728 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */
1729 #define CIFS_NEG_OP 0x0200 /* negotiate request */
1730 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */
1731 /* Lower bitmask values are reserved by others below. */
1732 #define CIFS_SESS_OP 0x2000 /* session setup request */
1733 #define CIFS_OP_MASK 0x2780 /* mask request type */
1735 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */
1736 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */
1737 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */
1739 /* Security Flags: indicate type of session setup needed */
1740 #define CIFSSEC_MAY_SIGN 0x00001
1741 #define CIFSSEC_MAY_NTLMV2 0x00004
1742 #define CIFSSEC_MAY_KRB5 0x00008
1743 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
1744 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
1746 #define CIFSSEC_MUST_SIGN 0x01001
1747 /* note that only one of the following can be set so the
1748 result of setting MUST flags more than once will be to
1749 require use of the stronger protocol */
1750 #define CIFSSEC_MUST_NTLMV2 0x04004
1751 #define CIFSSEC_MUST_KRB5 0x08008
1752 #ifdef CONFIG_CIFS_UPCALL
1753 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
1755 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
1757 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
1758 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
1760 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1761 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
1762 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1764 *****************************************************************
1765 * All constants go here
1766 *****************************************************************
1769 #define UID_HASH (16)
1772 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1773 * following to be declared.
1776 /****************************************************************************
1777 * Locking notes. All updates to global variables and lists should be
1778 * protected by spinlocks or semaphores.
1782 * GlobalMid_Lock protects:
1783 * list operations on pending_mid_q and oplockQ
1784 * updates to XID counters, multiplex id and SMB sequence numbers
1785 * list operations on global DnotifyReqList
1786 * updates to ses->status and TCP_Server_Info->tcpStatus
1787 * updates to server->CurrentMid
1788 * tcp_ses_lock protects:
1789 * list operations on tcp and SMB session lists
1790 * tcon->open_file_lock protects the list of open files hanging off the tcon
1791 * inode->open_file_lock protects the openFileList hanging off the inode
1792 * cfile->file_info_lock protects counters and fields in cifs file struct
1793 * f_owner.lock protects certain per file struct operations
1794 * mapping->page_lock protects certain per page operations
1796 * Note that the cifs_tcon.open_file_lock should be taken before
1797 * not after the cifsInodeInfo.open_file_lock
1801 * cifsInodeInfo->lock_sem protects:
1802 * the list of locks held by the inode
1804 ****************************************************************************/
1806 #ifdef DECLARE_GLOBALS_HERE
1807 #define GLOBAL_EXTERN
1809 #define GLOBAL_EXTERN extern
1813 * the list of TCP_Server_Info structures, ie each of the sockets
1814 * connecting our client to a distinct server (ip address), is
1815 * chained together by cifs_tcp_ses_list. The list of all our SMB
1816 * sessions (and from that the tree connections) can be found
1817 * by iterating over cifs_tcp_ses_list
1819 GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
1822 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1823 * tcp session, and the list of tcon's per smb session. It also protects
1824 * the reference counters for the server, smb session, and tcon. It also
1825 * protects some fields in the TCP_Server_Info struct such as dstaddr. Finally,
1826 * changes to the tcon->tidStatus should be done while holding this lock.
1827 * generally the locks should be taken in order tcp_ses_lock before
1828 * tcon->open_file_lock and that before file->file_info_lock since the
1829 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file
1831 GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
1834 * Global transaction id (XID) information
1836 GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
1837 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1838 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
1839 GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
1840 /* on midQ entries */
1842 * Global counters, updated atomically
1844 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1845 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1846 GLOBAL_EXTERN atomic_t tcpSesNextId;
1847 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1848 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1849 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1851 /* Various Debug counters */
1852 GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
1853 #ifdef CONFIG_CIFS_STATS2
1854 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1855 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1856 extern unsigned int slow_rsp_threshold; /* number of secs before logging */
1858 GLOBAL_EXTERN atomic_t smBufAllocCount;
1859 GLOBAL_EXTERN atomic_t midCount;
1862 extern bool enable_oplocks; /* enable or disable oplocks */
1863 extern bool lookupCacheEnabled;
1864 extern unsigned int global_secflags; /* if on, session setup sent
1865 with more secure ntlmssp2 challenge/resp */
1866 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
1867 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */
1868 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */
1869 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */
1870 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1871 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */
1872 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
1873 extern unsigned int cifs_min_small; /* min size of small buf pool */
1874 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
1875 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
1877 void cifs_oplock_break(struct work_struct *work);
1878 void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
1879 void smb2_deferred_work_close(struct work_struct *work);
1881 extern const struct slow_work_ops cifs_oplock_break_ops;
1882 extern struct workqueue_struct *cifsiod_wq;
1883 extern struct workqueue_struct *decrypt_wq;
1884 extern struct workqueue_struct *fileinfo_put_wq;
1885 extern struct workqueue_struct *cifsoplockd_wq;
1886 extern struct workqueue_struct *deferredclose_wq;
1887 extern __u32 cifs_lock_secret;
1889 extern mempool_t *cifs_mid_poolp;
1891 /* Operations for different SMB versions */
1892 #define SMB1_VERSION_STRING "1.0"
1893 extern struct smb_version_operations smb1_operations;
1894 extern struct smb_version_values smb1_values;
1895 #define SMB20_VERSION_STRING "2.0"
1896 extern struct smb_version_operations smb20_operations;
1897 extern struct smb_version_values smb20_values;
1898 #define SMB21_VERSION_STRING "2.1"
1899 extern struct smb_version_operations smb21_operations;
1900 extern struct smb_version_values smb21_values;
1901 #define SMBDEFAULT_VERSION_STRING "default"
1902 extern struct smb_version_values smbdefault_values;
1903 #define SMB3ANY_VERSION_STRING "3"
1904 extern struct smb_version_values smb3any_values;
1905 #define SMB30_VERSION_STRING "3.0"
1906 extern struct smb_version_operations smb30_operations;
1907 extern struct smb_version_values smb30_values;
1908 #define SMB302_VERSION_STRING "3.02"
1909 #define ALT_SMB302_VERSION_STRING "3.0.2"
1910 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1911 extern struct smb_version_values smb302_values;
1912 #define SMB311_VERSION_STRING "3.1.1"
1913 #define ALT_SMB311_VERSION_STRING "3.11"
1914 extern struct smb_version_operations smb311_operations;
1915 extern struct smb_version_values smb311_values;
1917 static inline char *get_security_type_str(enum securityEnum sectype)
1921 return "RawNTLMSSP";
1931 static inline bool is_smb1_server(struct TCP_Server_Info *server)
1933 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0;
1936 static inline bool is_tcon_dfs(struct cifs_tcon *tcon)
1939 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS
1940 * Subsystem Notifies That a Share Is a DFS Share.
1942 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server
1943 * Application Updates a Share.
1945 if (!tcon || !tcon->ses || !tcon->ses->server)
1947 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS :
1948 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT);
1951 #endif /* _CIFS_GLOB_H */