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)
9 #include <linux/slab.h>
10 #include <linux/ctype.h>
11 #include <linux/mempool.h>
12 #include <linux/vmalloc.h>
15 #include "cifsproto.h"
16 #include "cifs_debug.h"
19 #include "cifs_unicode.h"
22 #ifdef CONFIG_CIFS_DFS_UPCALL
23 #include "dns_resolve.h"
24 #include "dfs_cache.h"
27 #include "fs_context.h"
28 #include "cached_dir.h"
30 extern mempool_t
*cifs_sm_req_poolp
;
31 extern mempool_t
*cifs_req_poolp
;
33 /* The xid serves as a useful identifier for each incoming vfs request,
34 in a similar way to the mid which is useful to track each sent smb,
35 and CurrentXid can also provide a running counter (although it
36 will eventually wrap past zero) of the total vfs operations handled
37 since the cifs fs was mounted */
44 spin_lock(&GlobalMid_Lock
);
45 GlobalTotalActiveXid
++;
47 /* keep high water mark for number of simultaneous ops in filesystem */
48 if (GlobalTotalActiveXid
> GlobalMaxActiveXid
)
49 GlobalMaxActiveXid
= GlobalTotalActiveXid
;
50 if (GlobalTotalActiveXid
> 65000)
51 cifs_dbg(FYI
, "warning: more than 65000 requests active\n");
52 xid
= GlobalCurrentXid
++;
53 spin_unlock(&GlobalMid_Lock
);
58 _free_xid(unsigned int xid
)
60 spin_lock(&GlobalMid_Lock
);
61 /* if (GlobalTotalActiveXid == 0)
63 GlobalTotalActiveXid
--;
64 spin_unlock(&GlobalMid_Lock
);
70 struct cifs_ses
*ret_buf
;
72 ret_buf
= kzalloc(sizeof(struct cifs_ses
), GFP_KERNEL
);
74 atomic_inc(&sesInfoAllocCount
);
75 spin_lock_init(&ret_buf
->ses_lock
);
76 ret_buf
->ses_status
= SES_NEW
;
78 INIT_LIST_HEAD(&ret_buf
->smb_ses_list
);
79 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
80 mutex_init(&ret_buf
->session_mutex
);
81 spin_lock_init(&ret_buf
->iface_lock
);
82 INIT_LIST_HEAD(&ret_buf
->iface_list
);
83 spin_lock_init(&ret_buf
->chan_lock
);
89 sesInfoFree(struct cifs_ses
*buf_to_free
)
91 struct cifs_server_iface
*iface
= NULL
, *niface
= NULL
;
93 if (buf_to_free
== NULL
) {
94 cifs_dbg(FYI
, "Null buffer passed to sesInfoFree\n");
98 atomic_dec(&sesInfoAllocCount
);
99 kfree(buf_to_free
->serverOS
);
100 kfree(buf_to_free
->serverDomain
);
101 kfree(buf_to_free
->serverNOS
);
102 kfree_sensitive(buf_to_free
->password
);
103 kfree(buf_to_free
->user_name
);
104 kfree(buf_to_free
->domainName
);
105 kfree_sensitive(buf_to_free
->auth_key
.response
);
106 spin_lock(&buf_to_free
->iface_lock
);
107 list_for_each_entry_safe(iface
, niface
, &buf_to_free
->iface_list
,
109 kref_put(&iface
->refcount
, release_iface
);
110 spin_unlock(&buf_to_free
->iface_lock
);
111 kfree_sensitive(buf_to_free
);
117 struct cifs_tcon
*ret_buf
;
119 ret_buf
= kzalloc(sizeof(*ret_buf
), GFP_KERNEL
);
122 ret_buf
->cfids
= init_cached_dirs();
123 if (!ret_buf
->cfids
) {
128 atomic_inc(&tconInfoAllocCount
);
129 ret_buf
->status
= TID_NEW
;
131 spin_lock_init(&ret_buf
->tc_lock
);
132 INIT_LIST_HEAD(&ret_buf
->openFileList
);
133 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
134 spin_lock_init(&ret_buf
->open_file_lock
);
135 spin_lock_init(&ret_buf
->stat_lock
);
136 atomic_set(&ret_buf
->num_local_opens
, 0);
137 atomic_set(&ret_buf
->num_remote_opens
, 0);
138 #ifdef CONFIG_CIFS_DFS_UPCALL
139 INIT_LIST_HEAD(&ret_buf
->dfs_ses_list
);
146 tconInfoFree(struct cifs_tcon
*tcon
)
149 cifs_dbg(FYI
, "Null buffer passed to tconInfoFree\n");
152 free_cached_dirs(tcon
->cfids
);
153 atomic_dec(&tconInfoAllocCount
);
154 kfree(tcon
->nativeFileSystem
);
155 kfree_sensitive(tcon
->password
);
156 #ifdef CONFIG_CIFS_DFS_UPCALL
157 dfs_put_root_smb_sessions(&tcon
->dfs_ses_list
);
165 struct smb_hdr
*ret_buf
= NULL
;
167 * SMB2 header is bigger than CIFS one - no problems to clean some
168 * more bytes for CIFS.
170 size_t buf_size
= sizeof(struct smb2_hdr
);
173 * We could use negotiated size instead of max_msgsize -
174 * but it may be more efficient to always alloc same size
175 * albeit slightly larger than necessary and maxbuffersize
176 * defaults to this and can not be bigger.
178 ret_buf
= mempool_alloc(cifs_req_poolp
, GFP_NOFS
);
180 /* clear the first few header bytes */
181 /* for most paths, more is cleared in header_assemble */
182 memset(ret_buf
, 0, buf_size
+ 3);
183 atomic_inc(&buf_alloc_count
);
184 #ifdef CONFIG_CIFS_STATS2
185 atomic_inc(&total_buf_alloc_count
);
186 #endif /* CONFIG_CIFS_STATS2 */
192 cifs_buf_release(void *buf_to_free
)
194 if (buf_to_free
== NULL
) {
195 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
198 mempool_free(buf_to_free
, cifs_req_poolp
);
200 atomic_dec(&buf_alloc_count
);
205 cifs_small_buf_get(void)
207 struct smb_hdr
*ret_buf
= NULL
;
209 /* We could use negotiated size instead of max_msgsize -
210 but it may be more efficient to always alloc same size
211 albeit slightly larger than necessary and maxbuffersize
212 defaults to this and can not be bigger */
213 ret_buf
= mempool_alloc(cifs_sm_req_poolp
, GFP_NOFS
);
214 /* No need to clear memory here, cleared in header assemble */
215 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
216 atomic_inc(&small_buf_alloc_count
);
217 #ifdef CONFIG_CIFS_STATS2
218 atomic_inc(&total_small_buf_alloc_count
);
219 #endif /* CONFIG_CIFS_STATS2 */
225 cifs_small_buf_release(void *buf_to_free
)
228 if (buf_to_free
== NULL
) {
229 cifs_dbg(FYI
, "Null buffer passed to cifs_small_buf_release\n");
232 mempool_free(buf_to_free
, cifs_sm_req_poolp
);
234 atomic_dec(&small_buf_alloc_count
);
239 free_rsp_buf(int resp_buftype
, void *rsp
)
241 if (resp_buftype
== CIFS_SMALL_BUFFER
)
242 cifs_small_buf_release(rsp
);
243 else if (resp_buftype
== CIFS_LARGE_BUFFER
)
244 cifs_buf_release(rsp
);
247 /* NB: MID can not be set if treeCon not passed in, in that
248 case it is responsbility of caller to set the mid */
250 header_assemble(struct smb_hdr
*buffer
, char smb_command
/* command */ ,
251 const struct cifs_tcon
*treeCon
, int word_count
252 /* length of fixed section (word count) in two byte units */)
254 char *temp
= (char *) buffer
;
256 memset(temp
, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
258 buffer
->smb_buf_length
= cpu_to_be32(
259 (2 * word_count
) + sizeof(struct smb_hdr
) -
260 4 /* RFC 1001 length field does not count */ +
261 2 /* for bcc field itself */) ;
263 buffer
->Protocol
[0] = 0xFF;
264 buffer
->Protocol
[1] = 'S';
265 buffer
->Protocol
[2] = 'M';
266 buffer
->Protocol
[3] = 'B';
267 buffer
->Command
= smb_command
;
268 buffer
->Flags
= 0x00; /* case sensitive */
269 buffer
->Flags2
= SMBFLG2_KNOWS_LONG_NAMES
;
270 buffer
->Pid
= cpu_to_le16((__u16
)current
->tgid
);
271 buffer
->PidHigh
= cpu_to_le16((__u16
)(current
->tgid
>> 16));
273 buffer
->Tid
= treeCon
->tid
;
275 if (treeCon
->ses
->capabilities
& CAP_UNICODE
)
276 buffer
->Flags2
|= SMBFLG2_UNICODE
;
277 if (treeCon
->ses
->capabilities
& CAP_STATUS32
)
278 buffer
->Flags2
|= SMBFLG2_ERR_STATUS
;
280 /* Uid is not converted */
281 buffer
->Uid
= treeCon
->ses
->Suid
;
282 if (treeCon
->ses
->server
)
283 buffer
->Mid
= get_next_mid(treeCon
->ses
->server
);
285 if (treeCon
->Flags
& SMB_SHARE_IS_IN_DFS
)
286 buffer
->Flags2
|= SMBFLG2_DFS
;
288 buffer
->Flags
|= SMBFLG_CASELESS
;
289 if ((treeCon
->ses
) && (treeCon
->ses
->server
))
290 if (treeCon
->ses
->server
->sign
)
291 buffer
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
294 /* endian conversion of flags is now done just before sending */
295 buffer
->WordCount
= (char) word_count
;
300 check_smb_hdr(struct smb_hdr
*smb
)
302 /* does it have the right SMB "signature" ? */
303 if (*(__le32
*) smb
->Protocol
!= cpu_to_le32(0x424d53ff)) {
304 cifs_dbg(VFS
, "Bad protocol string signature header 0x%x\n",
305 *(unsigned int *)smb
->Protocol
);
309 /* if it's a response then accept */
310 if (smb
->Flags
& SMBFLG_RESPONSE
)
313 /* only one valid case where server sends us request */
314 if (smb
->Command
== SMB_COM_LOCKING_ANDX
)
317 cifs_dbg(VFS
, "Server sent request, not response. mid=%u\n",
323 checkSMB(char *buf
, unsigned int total_read
, struct TCP_Server_Info
*server
)
325 struct smb_hdr
*smb
= (struct smb_hdr
*)buf
;
326 __u32 rfclen
= be32_to_cpu(smb
->smb_buf_length
);
327 __u32 clc_len
; /* calculated length */
328 cifs_dbg(FYI
, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
331 /* is this frame too small to even get to a BCC? */
332 if (total_read
< 2 + sizeof(struct smb_hdr
)) {
333 if ((total_read
>= sizeof(struct smb_hdr
) - 1)
334 && (smb
->Status
.CifsError
!= 0)) {
335 /* it's an error return */
337 /* some error cases do not return wct and bcc */
339 } else if ((total_read
== sizeof(struct smb_hdr
) + 1) &&
340 (smb
->WordCount
== 0)) {
341 char *tmp
= (char *)smb
;
342 /* Need to work around a bug in two servers here */
343 /* First, check if the part of bcc they sent was zero */
344 if (tmp
[sizeof(struct smb_hdr
)] == 0) {
345 /* some servers return only half of bcc
346 * on simple responses (wct, bcc both zero)
347 * in particular have seen this on
348 * ulogoffX and FindClose. This leaves
349 * one byte of bcc potentially unitialized
351 /* zero rest of bcc */
352 tmp
[sizeof(struct smb_hdr
)+1] = 0;
355 cifs_dbg(VFS
, "rcvd invalid byte count (bcc)\n");
357 cifs_dbg(VFS
, "Length less than smb header size\n");
362 /* otherwise, there is enough to get to the BCC */
363 if (check_smb_hdr(smb
))
365 clc_len
= smbCalcSize(smb
);
367 if (4 + rfclen
!= total_read
) {
368 cifs_dbg(VFS
, "Length read does not match RFC1001 length %d\n",
373 if (4 + rfclen
!= clc_len
) {
374 __u16 mid
= get_mid(smb
);
375 /* check if bcc wrapped around for large read responses */
376 if ((rfclen
> 64 * 1024) && (rfclen
> clc_len
)) {
377 /* check if lengths match mod 64K */
378 if (((4 + rfclen
) & 0xFFFF) == (clc_len
& 0xFFFF))
379 return 0; /* bcc wrapped */
381 cifs_dbg(FYI
, "Calculated size %u vs length %u mismatch for mid=%u\n",
382 clc_len
, 4 + rfclen
, mid
);
384 if (4 + rfclen
< clc_len
) {
385 cifs_dbg(VFS
, "RFC1001 size %u smaller than SMB for mid=%u\n",
388 } else if (rfclen
> clc_len
+ 512) {
390 * Some servers (Windows XP in particular) send more
391 * data than the lengths in the SMB packet would
392 * indicate on certain calls (byte range locks and
393 * trans2 find first calls in particular). While the
394 * client can handle such a frame by ignoring the
395 * trailing data, we choose limit the amount of extra
398 cifs_dbg(VFS
, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
407 is_valid_oplock_break(char *buffer
, struct TCP_Server_Info
*srv
)
409 struct smb_hdr
*buf
= (struct smb_hdr
*)buffer
;
410 struct smb_com_lock_req
*pSMB
= (struct smb_com_lock_req
*)buf
;
411 struct TCP_Server_Info
*pserver
;
412 struct cifs_ses
*ses
;
413 struct cifs_tcon
*tcon
;
414 struct cifsInodeInfo
*pCifsInode
;
415 struct cifsFileInfo
*netfile
;
417 cifs_dbg(FYI
, "Checking for oplock break or dnotify response\n");
418 if ((pSMB
->hdr
.Command
== SMB_COM_NT_TRANSACT
) &&
419 (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
)) {
420 struct smb_com_transaction_change_notify_rsp
*pSMBr
=
421 (struct smb_com_transaction_change_notify_rsp
*)buf
;
422 struct file_notify_information
*pnotify
;
423 __u32 data_offset
= 0;
424 size_t len
= srv
->total_read
- sizeof(pSMBr
->hdr
.smb_buf_length
);
426 if (get_bcc(buf
) > sizeof(struct file_notify_information
)) {
427 data_offset
= le32_to_cpu(pSMBr
->DataOffset
);
430 len
- sizeof(struct file_notify_information
)) {
431 cifs_dbg(FYI
, "Invalid data_offset %u\n",
435 pnotify
= (struct file_notify_information
*)
436 ((char *)&pSMBr
->hdr
.Protocol
+ data_offset
);
437 cifs_dbg(FYI
, "dnotify on %s Action: 0x%x\n",
438 pnotify
->FileName
, pnotify
->Action
);
439 /* cifs_dump_mem("Rcvd notify Data: ",buf,
440 sizeof(struct smb_hdr)+60); */
443 if (pSMBr
->hdr
.Status
.CifsError
) {
444 cifs_dbg(FYI
, "notify err 0x%x\n",
445 pSMBr
->hdr
.Status
.CifsError
);
450 if (pSMB
->hdr
.Command
!= SMB_COM_LOCKING_ANDX
)
452 if (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
) {
453 /* no sense logging error on invalid handle on oplock
454 break - harmless race between close request and oplock
455 break response is expected from time to time writing out
456 large dirty files cached on the client */
457 if ((NT_STATUS_INVALID_HANDLE
) ==
458 le32_to_cpu(pSMB
->hdr
.Status
.CifsError
)) {
459 cifs_dbg(FYI
, "Invalid handle on oplock break\n");
461 } else if (ERRbadfid
==
462 le16_to_cpu(pSMB
->hdr
.Status
.DosError
.Error
)) {
465 return false; /* on valid oplock brk we get "request" */
468 if (pSMB
->hdr
.WordCount
!= 8)
471 cifs_dbg(FYI
, "oplock type 0x%x level 0x%x\n",
472 pSMB
->LockType
, pSMB
->OplockLevel
);
473 if (!(pSMB
->LockType
& LOCKING_ANDX_OPLOCK_RELEASE
))
476 /* If server is a channel, select the primary channel */
477 pserver
= CIFS_SERVER_IS_CHAN(srv
) ? srv
->primary_server
: srv
;
479 /* look up tcon based on tid & uid */
480 spin_lock(&cifs_tcp_ses_lock
);
481 list_for_each_entry(ses
, &pserver
->smb_ses_list
, smb_ses_list
) {
482 list_for_each_entry(tcon
, &ses
->tcon_list
, tcon_list
) {
483 if (tcon
->tid
!= buf
->Tid
)
486 cifs_stats_inc(&tcon
->stats
.cifs_stats
.num_oplock_brks
);
487 spin_lock(&tcon
->open_file_lock
);
488 list_for_each_entry(netfile
, &tcon
->openFileList
, tlist
) {
489 if (pSMB
->Fid
!= netfile
->fid
.netfid
)
492 cifs_dbg(FYI
, "file id match, oplock break\n");
493 pCifsInode
= CIFS_I(d_inode(netfile
->dentry
));
495 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
,
498 netfile
->oplock_epoch
= 0;
499 netfile
->oplock_level
= pSMB
->OplockLevel
;
500 netfile
->oplock_break_cancelled
= false;
501 cifs_queue_oplock_break(netfile
);
503 spin_unlock(&tcon
->open_file_lock
);
504 spin_unlock(&cifs_tcp_ses_lock
);
507 spin_unlock(&tcon
->open_file_lock
);
508 spin_unlock(&cifs_tcp_ses_lock
);
509 cifs_dbg(FYI
, "No matching file for oplock break\n");
513 spin_unlock(&cifs_tcp_ses_lock
);
514 cifs_dbg(FYI
, "Can not process oplock break for non-existent connection\n");
519 dump_smb(void *buf
, int smb_buf_length
)
524 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
, 8, 2, buf
,
525 smb_buf_length
, true);
529 cifs_autodisable_serverino(struct cifs_sb_info
*cifs_sb
)
531 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
532 struct cifs_tcon
*tcon
= NULL
;
534 if (cifs_sb
->master_tlink
)
535 tcon
= cifs_sb_master_tcon(cifs_sb
);
537 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
538 cifs_sb
->mnt_cifs_serverino_autodisabled
= true;
539 cifs_dbg(VFS
, "Autodisabling the use of server inode numbers on %s\n",
540 tcon
? tcon
->tree_name
: "new server");
541 cifs_dbg(VFS
, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n");
542 cifs_dbg(VFS
, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
547 void cifs_set_oplock_level(struct cifsInodeInfo
*cinode
, __u32 oplock
)
551 if (oplock
== OPLOCK_EXCLUSIVE
) {
552 cinode
->oplock
= CIFS_CACHE_WRITE_FLG
| CIFS_CACHE_READ_FLG
;
553 cifs_dbg(FYI
, "Exclusive Oplock granted on inode %p\n",
554 &cinode
->netfs
.inode
);
555 } else if (oplock
== OPLOCK_READ
) {
556 cinode
->oplock
= CIFS_CACHE_READ_FLG
;
557 cifs_dbg(FYI
, "Level II Oplock granted on inode %p\n",
558 &cinode
->netfs
.inode
);
564 * We wait for oplock breaks to be processed before we attempt to perform
567 int cifs_get_writer(struct cifsInodeInfo
*cinode
)
572 rc
= wait_on_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
,
577 spin_lock(&cinode
->writers_lock
);
578 if (!cinode
->writers
)
579 set_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
581 /* Check to see if we have started servicing an oplock break */
582 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
)) {
584 if (cinode
->writers
== 0) {
585 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
586 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
588 spin_unlock(&cinode
->writers_lock
);
591 spin_unlock(&cinode
->writers_lock
);
595 void cifs_put_writer(struct cifsInodeInfo
*cinode
)
597 spin_lock(&cinode
->writers_lock
);
599 if (cinode
->writers
== 0) {
600 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
601 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
603 spin_unlock(&cinode
->writers_lock
);
607 * cifs_queue_oplock_break - queue the oplock break handler for cfile
608 * @cfile: The file to break the oplock on
610 * This function is called from the demultiplex thread when it
611 * receives an oplock break for @cfile.
613 * Assumes the tcon->open_file_lock is held.
614 * Assumes cfile->file_info_lock is NOT held.
616 void cifs_queue_oplock_break(struct cifsFileInfo
*cfile
)
619 * Bump the handle refcount now while we hold the
620 * open_file_lock to enforce the validity of it for the oplock
621 * break handler. The matching put is done at the end of the
624 cifsFileInfo_get(cfile
);
626 queue_work(cifsoplockd_wq
, &cfile
->oplock_break
);
629 void cifs_done_oplock_break(struct cifsInodeInfo
*cinode
)
631 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
);
632 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
);
636 backup_cred(struct cifs_sb_info
*cifs_sb
)
638 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPUID
) {
639 if (uid_eq(cifs_sb
->ctx
->backupuid
, current_fsuid()))
642 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPGID
) {
643 if (in_group_p(cifs_sb
->ctx
->backupgid
))
651 cifs_del_pending_open(struct cifs_pending_open
*open
)
653 spin_lock(&tlink_tcon(open
->tlink
)->open_file_lock
);
654 list_del(&open
->olist
);
655 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
659 cifs_add_pending_open_locked(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
660 struct cifs_pending_open
*open
)
662 memcpy(open
->lease_key
, fid
->lease_key
, SMB2_LEASE_KEY_SIZE
);
663 open
->oplock
= CIFS_OPLOCK_NO_CHANGE
;
665 fid
->pending_open
= open
;
666 list_add_tail(&open
->olist
, &tlink_tcon(tlink
)->pending_opens
);
670 cifs_add_pending_open(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
671 struct cifs_pending_open
*open
)
673 spin_lock(&tlink_tcon(tlink
)->open_file_lock
);
674 cifs_add_pending_open_locked(fid
, tlink
, open
);
675 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
679 * Critical section which runs after acquiring deferred_lock.
680 * As there is no reference count on cifs_deferred_close, pdclose
681 * should not be used outside deferred_lock.
684 cifs_is_deferred_close(struct cifsFileInfo
*cfile
, struct cifs_deferred_close
**pdclose
)
686 struct cifs_deferred_close
*dclose
;
688 list_for_each_entry(dclose
, &CIFS_I(d_inode(cfile
->dentry
))->deferred_closes
, dlist
) {
689 if ((dclose
->netfid
== cfile
->fid
.netfid
) &&
690 (dclose
->persistent_fid
== cfile
->fid
.persistent_fid
) &&
691 (dclose
->volatile_fid
== cfile
->fid
.volatile_fid
)) {
700 * Critical section which runs after acquiring deferred_lock.
703 cifs_add_deferred_close(struct cifsFileInfo
*cfile
, struct cifs_deferred_close
*dclose
)
705 bool is_deferred
= false;
706 struct cifs_deferred_close
*pdclose
;
708 is_deferred
= cifs_is_deferred_close(cfile
, &pdclose
);
714 dclose
->tlink
= cfile
->tlink
;
715 dclose
->netfid
= cfile
->fid
.netfid
;
716 dclose
->persistent_fid
= cfile
->fid
.persistent_fid
;
717 dclose
->volatile_fid
= cfile
->fid
.volatile_fid
;
718 list_add_tail(&dclose
->dlist
, &CIFS_I(d_inode(cfile
->dentry
))->deferred_closes
);
722 * Critical section which runs after acquiring deferred_lock.
725 cifs_del_deferred_close(struct cifsFileInfo
*cfile
)
727 bool is_deferred
= false;
728 struct cifs_deferred_close
*dclose
;
730 is_deferred
= cifs_is_deferred_close(cfile
, &dclose
);
733 list_del(&dclose
->dlist
);
738 cifs_close_deferred_file(struct cifsInodeInfo
*cifs_inode
)
740 struct cifsFileInfo
*cfile
= NULL
;
741 struct file_list
*tmp_list
, *tmp_next_list
;
742 struct list_head file_head
;
744 if (cifs_inode
== NULL
)
747 INIT_LIST_HEAD(&file_head
);
748 spin_lock(&cifs_inode
->open_file_lock
);
749 list_for_each_entry(cfile
, &cifs_inode
->openFileList
, flist
) {
750 if (delayed_work_pending(&cfile
->deferred
)) {
751 if (cancel_delayed_work(&cfile
->deferred
)) {
752 cifs_del_deferred_close(cfile
);
754 tmp_list
= kmalloc(sizeof(struct file_list
), GFP_ATOMIC
);
755 if (tmp_list
== NULL
)
757 tmp_list
->cfile
= cfile
;
758 list_add_tail(&tmp_list
->list
, &file_head
);
762 spin_unlock(&cifs_inode
->open_file_lock
);
764 list_for_each_entry_safe(tmp_list
, tmp_next_list
, &file_head
, list
) {
765 _cifsFileInfo_put(tmp_list
->cfile
, true, false);
766 list_del(&tmp_list
->list
);
772 cifs_close_all_deferred_files(struct cifs_tcon
*tcon
)
774 struct cifsFileInfo
*cfile
;
775 struct file_list
*tmp_list
, *tmp_next_list
;
776 struct list_head file_head
;
778 INIT_LIST_HEAD(&file_head
);
779 spin_lock(&tcon
->open_file_lock
);
780 list_for_each_entry(cfile
, &tcon
->openFileList
, tlist
) {
781 if (delayed_work_pending(&cfile
->deferred
)) {
782 if (cancel_delayed_work(&cfile
->deferred
)) {
783 cifs_del_deferred_close(cfile
);
785 tmp_list
= kmalloc(sizeof(struct file_list
), GFP_ATOMIC
);
786 if (tmp_list
== NULL
)
788 tmp_list
->cfile
= cfile
;
789 list_add_tail(&tmp_list
->list
, &file_head
);
793 spin_unlock(&tcon
->open_file_lock
);
795 list_for_each_entry_safe(tmp_list
, tmp_next_list
, &file_head
, list
) {
796 _cifsFileInfo_put(tmp_list
->cfile
, true, false);
797 list_del(&tmp_list
->list
);
802 cifs_close_deferred_file_under_dentry(struct cifs_tcon
*tcon
, const char *path
)
804 struct cifsFileInfo
*cfile
;
805 struct file_list
*tmp_list
, *tmp_next_list
;
806 struct list_head file_head
;
808 const char *full_path
;
810 INIT_LIST_HEAD(&file_head
);
811 page
= alloc_dentry_path();
812 spin_lock(&tcon
->open_file_lock
);
813 list_for_each_entry(cfile
, &tcon
->openFileList
, tlist
) {
814 full_path
= build_path_from_dentry(cfile
->dentry
, page
);
815 if (strstr(full_path
, path
)) {
816 if (delayed_work_pending(&cfile
->deferred
)) {
817 if (cancel_delayed_work(&cfile
->deferred
)) {
818 cifs_del_deferred_close(cfile
);
820 tmp_list
= kmalloc(sizeof(struct file_list
), GFP_ATOMIC
);
821 if (tmp_list
== NULL
)
823 tmp_list
->cfile
= cfile
;
824 list_add_tail(&tmp_list
->list
, &file_head
);
829 spin_unlock(&tcon
->open_file_lock
);
831 list_for_each_entry_safe(tmp_list
, tmp_next_list
, &file_head
, list
) {
832 _cifsFileInfo_put(tmp_list
->cfile
, true, false);
833 list_del(&tmp_list
->list
);
836 free_dentry_path(page
);
839 /* parses DFS referral V3 structure
840 * caller is responsible for freeing target_nodes
843 * - on failure - errno
846 parse_dfs_referrals(struct get_dfs_referral_rsp
*rsp
, u32 rsp_size
,
847 unsigned int *num_of_nodes
,
848 struct dfs_info3_param
**target_nodes
,
849 const struct nls_table
*nls_codepage
, int remap
,
850 const char *searchName
, bool is_unicode
)
854 struct dfs_referral_level_3
*ref
;
856 *num_of_nodes
= le16_to_cpu(rsp
->NumberOfReferrals
);
858 if (*num_of_nodes
< 1) {
859 cifs_dbg(VFS
, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
862 goto parse_DFS_referrals_exit
;
865 ref
= (struct dfs_referral_level_3
*) &(rsp
->referrals
);
866 if (ref
->VersionNumber
!= cpu_to_le16(3)) {
867 cifs_dbg(VFS
, "Referrals of V%d version are not supported, should be V3\n",
868 le16_to_cpu(ref
->VersionNumber
));
870 goto parse_DFS_referrals_exit
;
873 /* get the upper boundary of the resp buffer */
874 data_end
= (char *)rsp
+ rsp_size
;
876 cifs_dbg(FYI
, "num_referrals: %d dfs flags: 0x%x ...\n",
877 *num_of_nodes
, le32_to_cpu(rsp
->DFSFlags
));
879 *target_nodes
= kcalloc(*num_of_nodes
, sizeof(struct dfs_info3_param
),
881 if (*target_nodes
== NULL
) {
883 goto parse_DFS_referrals_exit
;
886 /* collect necessary data from referrals */
887 for (i
= 0; i
< *num_of_nodes
; i
++) {
890 struct dfs_info3_param
*node
= (*target_nodes
)+i
;
892 node
->flags
= le32_to_cpu(rsp
->DFSFlags
);
894 __le16
*tmp
= kmalloc(strlen(searchName
)*2 + 2,
898 goto parse_DFS_referrals_exit
;
900 cifsConvertToUTF16((__le16
*) tmp
, searchName
,
901 PATH_MAX
, nls_codepage
, remap
);
902 node
->path_consumed
= cifs_utf16_bytes(tmp
,
903 le16_to_cpu(rsp
->PathConsumed
),
907 node
->path_consumed
= le16_to_cpu(rsp
->PathConsumed
);
909 node
->server_type
= le16_to_cpu(ref
->ServerType
);
910 node
->ref_flag
= le16_to_cpu(ref
->ReferralEntryFlags
);
913 temp
= (char *)ref
+ le16_to_cpu(ref
->DfsPathOffset
);
914 max_len
= data_end
- temp
;
915 node
->path_name
= cifs_strndup_from_utf16(temp
, max_len
,
916 is_unicode
, nls_codepage
);
917 if (!node
->path_name
) {
919 goto parse_DFS_referrals_exit
;
922 /* copy link target UNC */
923 temp
= (char *)ref
+ le16_to_cpu(ref
->NetworkAddressOffset
);
924 max_len
= data_end
- temp
;
925 node
->node_name
= cifs_strndup_from_utf16(temp
, max_len
,
926 is_unicode
, nls_codepage
);
927 if (!node
->node_name
) {
929 goto parse_DFS_referrals_exit
;
932 node
->ttl
= le32_to_cpu(ref
->TimeToLive
);
937 parse_DFS_referrals_exit
:
939 free_dfs_info_array(*target_nodes
, *num_of_nodes
);
940 *target_nodes
= NULL
;
946 struct cifs_aio_ctx
*
947 cifs_aio_ctx_alloc(void)
949 struct cifs_aio_ctx
*ctx
;
952 * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
953 * to false so that we know when we have to unreference pages within
954 * cifs_aio_ctx_release()
956 ctx
= kzalloc(sizeof(struct cifs_aio_ctx
), GFP_KERNEL
);
960 INIT_LIST_HEAD(&ctx
->list
);
961 mutex_init(&ctx
->aio_mutex
);
962 init_completion(&ctx
->done
);
963 kref_init(&ctx
->refcount
);
968 cifs_aio_ctx_release(struct kref
*refcount
)
970 struct cifs_aio_ctx
*ctx
= container_of(refcount
,
971 struct cifs_aio_ctx
, refcount
);
973 cifsFileInfo_put(ctx
->cfile
);
976 * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
977 * which means that iov_iter_get_pages() was a success and thus that
978 * we have taken reference on pages.
983 for (i
= 0; i
< ctx
->npages
; i
++) {
984 if (ctx
->should_dirty
)
985 set_page_dirty(ctx
->bv
[i
].bv_page
);
986 put_page(ctx
->bv
[i
].bv_page
);
994 #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
997 setup_aio_ctx_iter(struct cifs_aio_ctx
*ctx
, struct iov_iter
*iter
, int rw
)
1000 unsigned int cur_npages
;
1001 unsigned int npages
= 0;
1004 size_t count
= iov_iter_count(iter
);
1005 unsigned int saved_len
;
1007 unsigned int max_pages
= iov_iter_npages(iter
, INT_MAX
);
1008 struct page
**pages
= NULL
;
1009 struct bio_vec
*bv
= NULL
;
1011 if (iov_iter_is_kvec(iter
)) {
1012 memcpy(&ctx
->iter
, iter
, sizeof(*iter
));
1014 iov_iter_advance(iter
, count
);
1018 if (array_size(max_pages
, sizeof(*bv
)) <= CIFS_AIO_KMALLOC_LIMIT
)
1019 bv
= kmalloc_array(max_pages
, sizeof(*bv
), GFP_KERNEL
);
1022 bv
= vmalloc(array_size(max_pages
, sizeof(*bv
)));
1027 if (array_size(max_pages
, sizeof(*pages
)) <= CIFS_AIO_KMALLOC_LIMIT
)
1028 pages
= kmalloc_array(max_pages
, sizeof(*pages
), GFP_KERNEL
);
1031 pages
= vmalloc(array_size(max_pages
, sizeof(*pages
)));
1040 while (count
&& npages
< max_pages
) {
1041 rc
= iov_iter_get_pages2(iter
, pages
, count
, max_pages
, &start
);
1043 cifs_dbg(VFS
, "Couldn't get user pages (rc=%zd)\n", rc
);
1048 cifs_dbg(VFS
, "get pages rc=%zd more than %zu\n", rc
,
1055 cur_npages
= DIV_ROUND_UP(rc
, PAGE_SIZE
);
1057 if (npages
+ cur_npages
> max_pages
) {
1058 cifs_dbg(VFS
, "out of vec array capacity (%u vs %u)\n",
1059 npages
+ cur_npages
, max_pages
);
1063 for (i
= 0; i
< cur_npages
; i
++) {
1064 len
= rc
> PAGE_SIZE
? PAGE_SIZE
: rc
;
1065 bv
[npages
+ i
].bv_page
= pages
[i
];
1066 bv
[npages
+ i
].bv_offset
= start
;
1067 bv
[npages
+ i
].bv_len
= len
- start
;
1072 npages
+= cur_npages
;
1077 ctx
->len
= saved_len
- count
;
1078 ctx
->npages
= npages
;
1079 iov_iter_bvec(&ctx
->iter
, rw
, ctx
->bv
, npages
, ctx
->len
);
1084 * cifs_alloc_hash - allocate hash and hash context together
1085 * @name: The name of the crypto hash algo
1086 * @sdesc: SHASH descriptor where to put the pointer to the hash TFM
1088 * The caller has to make sure @sdesc is initialized to either NULL or
1089 * a valid context. It can be freed via cifs_free_hash().
1092 cifs_alloc_hash(const char *name
, struct shash_desc
**sdesc
)
1095 struct crypto_shash
*alg
= NULL
;
1100 alg
= crypto_alloc_shash(name
, 0, 0);
1102 cifs_dbg(VFS
, "Could not allocate shash TFM '%s'\n", name
);
1108 *sdesc
= kmalloc(sizeof(struct shash_desc
) + crypto_shash_descsize(alg
), GFP_KERNEL
);
1109 if (*sdesc
== NULL
) {
1110 cifs_dbg(VFS
, "no memory left to allocate shash TFM '%s'\n", name
);
1111 crypto_free_shash(alg
);
1115 (*sdesc
)->tfm
= alg
;
1120 * cifs_free_hash - free hash and hash context together
1121 * @sdesc: Where to find the pointer to the hash TFM
1123 * Freeing a NULL descriptor is safe.
1126 cifs_free_hash(struct shash_desc
**sdesc
)
1128 if (unlikely(!sdesc
) || !*sdesc
)
1131 if ((*sdesc
)->tfm
) {
1132 crypto_free_shash((*sdesc
)->tfm
);
1133 (*sdesc
)->tfm
= NULL
;
1136 kfree_sensitive(*sdesc
);
1141 * rqst_page_get_length - obtain the length and offset for a page in smb_rqst
1142 * @rqst: The request descriptor
1143 * @page: The index of the page to query
1144 * @len: Where to store the length for this page:
1145 * @offset: Where to store the offset for this page
1147 void rqst_page_get_length(const struct smb_rqst
*rqst
, unsigned int page
,
1148 unsigned int *len
, unsigned int *offset
)
1150 *len
= rqst
->rq_pagesz
;
1151 *offset
= (page
== 0) ? rqst
->rq_offset
: 0;
1153 if (rqst
->rq_npages
== 1 || page
== rqst
->rq_npages
-1)
1154 *len
= rqst
->rq_tailsz
;
1156 *len
= rqst
->rq_pagesz
- rqst
->rq_offset
;
1159 void extract_unc_hostname(const char *unc
, const char **h
, size_t *len
)
1163 /* skip initial slashes */
1164 while (*unc
&& (*unc
== '\\' || *unc
== '/'))
1169 while (*end
&& !(*end
== '\\' || *end
== '/'))
1177 * copy_path_name - copy src path to dst, possibly truncating
1178 * @dst: The destination buffer
1179 * @src: The source name
1181 * returns number of bytes written (including trailing nul)
1183 int copy_path_name(char *dst
, const char *src
)
1188 * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it
1189 * will truncate and strlen(dst) will be PATH_MAX-1
1191 name_len
= strscpy(dst
, src
, PATH_MAX
);
1192 if (WARN_ON_ONCE(name_len
< 0))
1193 name_len
= PATH_MAX
-1;
1195 /* we count the trailing nul */
1200 struct super_cb_data
{
1202 struct super_block
*sb
;
1205 static void tcp_super_cb(struct super_block
*sb
, void *arg
)
1207 struct super_cb_data
*sd
= arg
;
1208 struct TCP_Server_Info
*server
= sd
->data
;
1209 struct cifs_sb_info
*cifs_sb
;
1210 struct cifs_tcon
*tcon
;
1215 cifs_sb
= CIFS_SB(sb
);
1216 tcon
= cifs_sb_master_tcon(cifs_sb
);
1217 if (tcon
->ses
->server
== server
)
1221 static struct super_block
*__cifs_get_super(void (*f
)(struct super_block
*, void *),
1224 struct super_cb_data sd
= {
1228 struct file_system_type
**fs_type
= (struct file_system_type
*[]) {
1229 &cifs_fs_type
, &smb3_fs_type
, NULL
,
1232 for (; *fs_type
; fs_type
++) {
1233 iterate_supers_type(*fs_type
, f
, &sd
);
1236 * Grab an active reference in order to prevent automounts (DFS links)
1237 * of expiring and then freeing up our cifs superblock pointer while
1238 * we're doing failover.
1240 cifs_sb_active(sd
.sb
);
1244 return ERR_PTR(-EINVAL
);
1247 static void __cifs_put_super(struct super_block
*sb
)
1249 if (!IS_ERR_OR_NULL(sb
))
1250 cifs_sb_deactive(sb
);
1253 struct super_block
*cifs_get_tcp_super(struct TCP_Server_Info
*server
)
1255 return __cifs_get_super(tcp_super_cb
, server
);
1258 void cifs_put_tcp_super(struct super_block
*sb
)
1260 __cifs_put_super(sb
);
1263 #ifdef CONFIG_CIFS_DFS_UPCALL
1264 int match_target_ip(struct TCP_Server_Info
*server
,
1265 const char *share
, size_t share_len
,
1270 struct sockaddr_storage ss
;
1274 target
= kzalloc(share_len
+ 3, GFP_KERNEL
);
1278 scnprintf(target
, share_len
+ 3, "\\\\%.*s", (int)share_len
, share
);
1280 cifs_dbg(FYI
, "%s: target name: %s\n", __func__
, target
+ 2);
1282 rc
= dns_resolve_server_name_to_ip(target
, (struct sockaddr
*)&ss
, NULL
);
1288 spin_lock(&server
->srv_lock
);
1289 *result
= cifs_match_ipaddr((struct sockaddr
*)&server
->dstaddr
, (struct sockaddr
*)&ss
);
1290 spin_unlock(&server
->srv_lock
);
1291 cifs_dbg(FYI
, "%s: ip addresses match: %u\n", __func__
, *result
);
1295 int cifs_update_super_prepath(struct cifs_sb_info
*cifs_sb
, char *prefix
)
1297 kfree(cifs_sb
->prepath
);
1299 if (prefix
&& *prefix
) {
1300 cifs_sb
->prepath
= kstrdup(prefix
, GFP_ATOMIC
);
1301 if (!cifs_sb
->prepath
)
1304 convert_delimiter(cifs_sb
->prepath
, CIFS_DIR_SEP(cifs_sb
));
1306 cifs_sb
->prepath
= NULL
;
1308 cifs_sb
->mnt_cifs_flags
|= CIFS_MOUNT_USE_PREFIX_PATH
;
1313 * Handle weird Windows SMB server behaviour. It responds with
1314 * STATUS_OBJECT_NAME_INVALID code to SMB2 QUERY_INFO request for
1315 * "\<server>\<dfsname>\<linkpath>" DFS reference, where <dfsname> contains
1316 * non-ASCII unicode symbols.
1318 int cifs_inval_name_dfs_link_error(const unsigned int xid
,
1319 struct cifs_tcon
*tcon
,
1320 struct cifs_sb_info
*cifs_sb
,
1321 const char *full_path
,
1324 struct cifs_ses
*ses
= tcon
->ses
;
1332 * Fast path - skip check when @full_path doesn't have a prefix path to
1333 * look up or tcon is not DFS.
1335 if (strlen(full_path
) < 2 || !cifs_sb
||
1336 (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_DFS
) ||
1337 !is_tcon_dfs(tcon
) || !ses
->server
->origin_fullpath
)
1341 * Slow path - tcon is DFS and @full_path has prefix path, so attempt
1342 * to get a referral to figure out whether it is an DFS link.
1344 len
= strnlen(tcon
->tree_name
, MAX_TREE_SIZE
+ 1) + strlen(full_path
) + 1;
1345 path
= kmalloc(len
, GFP_KERNEL
);
1349 scnprintf(path
, len
, "%s%s", tcon
->tree_name
, full_path
);
1350 ref_path
= dfs_cache_canonical_path(path
+ 1, cifs_sb
->local_nls
,
1351 cifs_remap(cifs_sb
));
1354 if (IS_ERR(ref_path
)) {
1355 if (PTR_ERR(ref_path
) != -EINVAL
)
1356 return PTR_ERR(ref_path
);
1358 struct dfs_info3_param
*refs
= NULL
;
1362 * XXX: we are not using dfs_cache_find() here because we might
1363 * end filling all the DFS cache and thus potentially
1364 * removing cached DFS targets that the client would eventually
1365 * need during failover.
1367 ses
= CIFS_DFS_ROOT_SES(ses
);
1368 if (ses
->server
->ops
->get_dfs_refer
&&
1369 !ses
->server
->ops
->get_dfs_refer(xid
, ses
, ref_path
, &refs
,
1370 &num_refs
, cifs_sb
->local_nls
,
1371 cifs_remap(cifs_sb
)))
1372 *islink
= refs
[0].server_type
== DFS_TYPE_LINK
;
1373 free_dfs_info_array(refs
, num_refs
);