4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/slab.h>
23 #include <linux/ctype.h>
24 #include <linux/mempool.h>
25 #include <linux/vmalloc.h>
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
32 #include "cifs_unicode.h"
35 extern mempool_t
*cifs_sm_req_poolp
;
36 extern mempool_t
*cifs_req_poolp
;
38 /* The xid serves as a useful identifier for each incoming vfs request,
39 in a similar way to the mid which is useful to track each sent smb,
40 and CurrentXid can also provide a running counter (although it
41 will eventually wrap past zero) of the total vfs operations handled
42 since the cifs fs was mounted */
49 spin_lock(&GlobalMid_Lock
);
50 GlobalTotalActiveXid
++;
52 /* keep high water mark for number of simultaneous ops in filesystem */
53 if (GlobalTotalActiveXid
> GlobalMaxActiveXid
)
54 GlobalMaxActiveXid
= GlobalTotalActiveXid
;
55 if (GlobalTotalActiveXid
> 65000)
56 cifs_dbg(FYI
, "warning: more than 65000 requests active\n");
57 xid
= GlobalCurrentXid
++;
58 spin_unlock(&GlobalMid_Lock
);
63 _free_xid(unsigned int xid
)
65 spin_lock(&GlobalMid_Lock
);
66 /* if (GlobalTotalActiveXid == 0)
68 GlobalTotalActiveXid
--;
69 spin_unlock(&GlobalMid_Lock
);
75 struct cifs_ses
*ret_buf
;
77 ret_buf
= kzalloc(sizeof(struct cifs_ses
), GFP_KERNEL
);
79 atomic_inc(&sesInfoAllocCount
);
80 ret_buf
->status
= CifsNew
;
82 INIT_LIST_HEAD(&ret_buf
->smb_ses_list
);
83 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
84 mutex_init(&ret_buf
->session_mutex
);
90 sesInfoFree(struct cifs_ses
*buf_to_free
)
92 if (buf_to_free
== NULL
) {
93 cifs_dbg(FYI
, "Null buffer passed to sesInfoFree\n");
97 atomic_dec(&sesInfoAllocCount
);
98 kfree(buf_to_free
->serverOS
);
99 kfree(buf_to_free
->serverDomain
);
100 kfree(buf_to_free
->serverNOS
);
101 if (buf_to_free
->password
) {
102 memset(buf_to_free
->password
, 0, strlen(buf_to_free
->password
));
103 kfree(buf_to_free
->password
);
105 kfree(buf_to_free
->user_name
);
106 kfree(buf_to_free
->domainName
);
107 kfree(buf_to_free
->auth_key
.response
);
114 struct cifs_tcon
*ret_buf
;
115 ret_buf
= kzalloc(sizeof(struct cifs_tcon
), GFP_KERNEL
);
117 atomic_inc(&tconInfoAllocCount
);
118 ret_buf
->tidStatus
= CifsNew
;
120 INIT_LIST_HEAD(&ret_buf
->openFileList
);
121 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
122 spin_lock_init(&ret_buf
->open_file_lock
);
123 #ifdef CONFIG_CIFS_STATS
124 spin_lock_init(&ret_buf
->stat_lock
);
131 tconInfoFree(struct cifs_tcon
*buf_to_free
)
133 if (buf_to_free
== NULL
) {
134 cifs_dbg(FYI
, "Null buffer passed to tconInfoFree\n");
137 atomic_dec(&tconInfoAllocCount
);
138 kfree(buf_to_free
->nativeFileSystem
);
139 if (buf_to_free
->password
) {
140 memset(buf_to_free
->password
, 0, strlen(buf_to_free
->password
));
141 kfree(buf_to_free
->password
);
149 struct smb_hdr
*ret_buf
= NULL
;
151 * SMB2 header is bigger than CIFS one - no problems to clean some
152 * more bytes for CIFS.
154 size_t buf_size
= sizeof(struct smb2_hdr
);
157 * We could use negotiated size instead of max_msgsize -
158 * but it may be more efficient to always alloc same size
159 * albeit slightly larger than necessary and maxbuffersize
160 * defaults to this and can not be bigger.
162 ret_buf
= mempool_alloc(cifs_req_poolp
, GFP_NOFS
);
164 /* clear the first few header bytes */
165 /* for most paths, more is cleared in header_assemble */
166 memset(ret_buf
, 0, buf_size
+ 3);
167 atomic_inc(&bufAllocCount
);
168 #ifdef CONFIG_CIFS_STATS2
169 atomic_inc(&totBufAllocCount
);
170 #endif /* CONFIG_CIFS_STATS2 */
176 cifs_buf_release(void *buf_to_free
)
178 if (buf_to_free
== NULL
) {
179 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
182 mempool_free(buf_to_free
, cifs_req_poolp
);
184 atomic_dec(&bufAllocCount
);
189 cifs_small_buf_get(void)
191 struct smb_hdr
*ret_buf
= NULL
;
193 /* We could use negotiated size instead of max_msgsize -
194 but it may be more efficient to always alloc same size
195 albeit slightly larger than necessary and maxbuffersize
196 defaults to this and can not be bigger */
197 ret_buf
= mempool_alloc(cifs_sm_req_poolp
, GFP_NOFS
);
198 /* No need to clear memory here, cleared in header assemble */
199 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
200 atomic_inc(&smBufAllocCount
);
201 #ifdef CONFIG_CIFS_STATS2
202 atomic_inc(&totSmBufAllocCount
);
203 #endif /* CONFIG_CIFS_STATS2 */
209 cifs_small_buf_release(void *buf_to_free
)
212 if (buf_to_free
== NULL
) {
213 cifs_dbg(FYI
, "Null buffer passed to cifs_small_buf_release\n");
216 mempool_free(buf_to_free
, cifs_sm_req_poolp
);
218 atomic_dec(&smBufAllocCount
);
223 free_rsp_buf(int resp_buftype
, void *rsp
)
225 if (resp_buftype
== CIFS_SMALL_BUFFER
)
226 cifs_small_buf_release(rsp
);
227 else if (resp_buftype
== CIFS_LARGE_BUFFER
)
228 cifs_buf_release(rsp
);
231 /* NB: MID can not be set if treeCon not passed in, in that
232 case it is responsbility of caller to set the mid */
234 header_assemble(struct smb_hdr
*buffer
, char smb_command
/* command */ ,
235 const struct cifs_tcon
*treeCon
, int word_count
236 /* length of fixed section (word count) in two byte units */)
238 char *temp
= (char *) buffer
;
240 memset(temp
, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
242 buffer
->smb_buf_length
= cpu_to_be32(
243 (2 * word_count
) + sizeof(struct smb_hdr
) -
244 4 /* RFC 1001 length field does not count */ +
245 2 /* for bcc field itself */) ;
247 buffer
->Protocol
[0] = 0xFF;
248 buffer
->Protocol
[1] = 'S';
249 buffer
->Protocol
[2] = 'M';
250 buffer
->Protocol
[3] = 'B';
251 buffer
->Command
= smb_command
;
252 buffer
->Flags
= 0x00; /* case sensitive */
253 buffer
->Flags2
= SMBFLG2_KNOWS_LONG_NAMES
;
254 buffer
->Pid
= cpu_to_le16((__u16
)current
->tgid
);
255 buffer
->PidHigh
= cpu_to_le16((__u16
)(current
->tgid
>> 16));
257 buffer
->Tid
= treeCon
->tid
;
259 if (treeCon
->ses
->capabilities
& CAP_UNICODE
)
260 buffer
->Flags2
|= SMBFLG2_UNICODE
;
261 if (treeCon
->ses
->capabilities
& CAP_STATUS32
)
262 buffer
->Flags2
|= SMBFLG2_ERR_STATUS
;
264 /* Uid is not converted */
265 buffer
->Uid
= treeCon
->ses
->Suid
;
266 buffer
->Mid
= get_next_mid(treeCon
->ses
->server
);
268 if (treeCon
->Flags
& SMB_SHARE_IS_IN_DFS
)
269 buffer
->Flags2
|= SMBFLG2_DFS
;
271 buffer
->Flags
|= SMBFLG_CASELESS
;
272 if ((treeCon
->ses
) && (treeCon
->ses
->server
))
273 if (treeCon
->ses
->server
->sign
)
274 buffer
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
277 /* endian conversion of flags is now done just before sending */
278 buffer
->WordCount
= (char) word_count
;
283 check_smb_hdr(struct smb_hdr
*smb
)
285 /* does it have the right SMB "signature" ? */
286 if (*(__le32
*) smb
->Protocol
!= cpu_to_le32(0x424d53ff)) {
287 cifs_dbg(VFS
, "Bad protocol string signature header 0x%x\n",
288 *(unsigned int *)smb
->Protocol
);
292 /* if it's a response then accept */
293 if (smb
->Flags
& SMBFLG_RESPONSE
)
296 /* only one valid case where server sends us request */
297 if (smb
->Command
== SMB_COM_LOCKING_ANDX
)
300 cifs_dbg(VFS
, "Server sent request, not response. mid=%u\n",
306 checkSMB(char *buf
, unsigned int total_read
, struct TCP_Server_Info
*server
)
308 struct smb_hdr
*smb
= (struct smb_hdr
*)buf
;
309 __u32 rfclen
= be32_to_cpu(smb
->smb_buf_length
);
310 __u32 clc_len
; /* calculated length */
311 cifs_dbg(FYI
, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
314 /* is this frame too small to even get to a BCC? */
315 if (total_read
< 2 + sizeof(struct smb_hdr
)) {
316 if ((total_read
>= sizeof(struct smb_hdr
) - 1)
317 && (smb
->Status
.CifsError
!= 0)) {
318 /* it's an error return */
320 /* some error cases do not return wct and bcc */
322 } else if ((total_read
== sizeof(struct smb_hdr
) + 1) &&
323 (smb
->WordCount
== 0)) {
324 char *tmp
= (char *)smb
;
325 /* Need to work around a bug in two servers here */
326 /* First, check if the part of bcc they sent was zero */
327 if (tmp
[sizeof(struct smb_hdr
)] == 0) {
328 /* some servers return only half of bcc
329 * on simple responses (wct, bcc both zero)
330 * in particular have seen this on
331 * ulogoffX and FindClose. This leaves
332 * one byte of bcc potentially unitialized
334 /* zero rest of bcc */
335 tmp
[sizeof(struct smb_hdr
)+1] = 0;
338 cifs_dbg(VFS
, "rcvd invalid byte count (bcc)\n");
340 cifs_dbg(VFS
, "Length less than smb header size\n");
345 /* otherwise, there is enough to get to the BCC */
346 if (check_smb_hdr(smb
))
348 clc_len
= smbCalcSize(smb
);
350 if (4 + rfclen
!= total_read
) {
351 cifs_dbg(VFS
, "Length read does not match RFC1001 length %d\n",
356 if (4 + rfclen
!= clc_len
) {
357 __u16 mid
= get_mid(smb
);
358 /* check if bcc wrapped around for large read responses */
359 if ((rfclen
> 64 * 1024) && (rfclen
> clc_len
)) {
360 /* check if lengths match mod 64K */
361 if (((4 + rfclen
) & 0xFFFF) == (clc_len
& 0xFFFF))
362 return 0; /* bcc wrapped */
364 cifs_dbg(FYI
, "Calculated size %u vs length %u mismatch for mid=%u\n",
365 clc_len
, 4 + rfclen
, mid
);
367 if (4 + rfclen
< clc_len
) {
368 cifs_dbg(VFS
, "RFC1001 size %u smaller than SMB for mid=%u\n",
371 } else if (rfclen
> clc_len
+ 512) {
373 * Some servers (Windows XP in particular) send more
374 * data than the lengths in the SMB packet would
375 * indicate on certain calls (byte range locks and
376 * trans2 find first calls in particular). While the
377 * client can handle such a frame by ignoring the
378 * trailing data, we choose limit the amount of extra
381 cifs_dbg(VFS
, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
390 is_valid_oplock_break(char *buffer
, struct TCP_Server_Info
*srv
)
392 struct smb_hdr
*buf
= (struct smb_hdr
*)buffer
;
393 struct smb_com_lock_req
*pSMB
= (struct smb_com_lock_req
*)buf
;
394 struct list_head
*tmp
, *tmp1
, *tmp2
;
395 struct cifs_ses
*ses
;
396 struct cifs_tcon
*tcon
;
397 struct cifsInodeInfo
*pCifsInode
;
398 struct cifsFileInfo
*netfile
;
400 cifs_dbg(FYI
, "Checking for oplock break or dnotify response\n");
401 if ((pSMB
->hdr
.Command
== SMB_COM_NT_TRANSACT
) &&
402 (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
)) {
403 struct smb_com_transaction_change_notify_rsp
*pSMBr
=
404 (struct smb_com_transaction_change_notify_rsp
*)buf
;
405 struct file_notify_information
*pnotify
;
406 __u32 data_offset
= 0;
407 if (get_bcc(buf
) > sizeof(struct file_notify_information
)) {
408 data_offset
= le32_to_cpu(pSMBr
->DataOffset
);
410 pnotify
= (struct file_notify_information
*)
411 ((char *)&pSMBr
->hdr
.Protocol
+ data_offset
);
412 cifs_dbg(FYI
, "dnotify on %s Action: 0x%x\n",
413 pnotify
->FileName
, pnotify
->Action
);
414 /* cifs_dump_mem("Rcvd notify Data: ",buf,
415 sizeof(struct smb_hdr)+60); */
418 if (pSMBr
->hdr
.Status
.CifsError
) {
419 cifs_dbg(FYI
, "notify err 0x%x\n",
420 pSMBr
->hdr
.Status
.CifsError
);
425 if (pSMB
->hdr
.Command
!= SMB_COM_LOCKING_ANDX
)
427 if (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
) {
428 /* no sense logging error on invalid handle on oplock
429 break - harmless race between close request and oplock
430 break response is expected from time to time writing out
431 large dirty files cached on the client */
432 if ((NT_STATUS_INVALID_HANDLE
) ==
433 le32_to_cpu(pSMB
->hdr
.Status
.CifsError
)) {
434 cifs_dbg(FYI
, "invalid handle on oplock break\n");
436 } else if (ERRbadfid
==
437 le16_to_cpu(pSMB
->hdr
.Status
.DosError
.Error
)) {
440 return false; /* on valid oplock brk we get "request" */
443 if (pSMB
->hdr
.WordCount
!= 8)
446 cifs_dbg(FYI
, "oplock type 0x%x level 0x%x\n",
447 pSMB
->LockType
, pSMB
->OplockLevel
);
448 if (!(pSMB
->LockType
& LOCKING_ANDX_OPLOCK_RELEASE
))
451 /* look up tcon based on tid & uid */
452 spin_lock(&cifs_tcp_ses_lock
);
453 list_for_each(tmp
, &srv
->smb_ses_list
) {
454 ses
= list_entry(tmp
, struct cifs_ses
, smb_ses_list
);
455 list_for_each(tmp1
, &ses
->tcon_list
) {
456 tcon
= list_entry(tmp1
, struct cifs_tcon
, tcon_list
);
457 if (tcon
->tid
!= buf
->Tid
)
460 cifs_stats_inc(&tcon
->stats
.cifs_stats
.num_oplock_brks
);
461 spin_lock(&tcon
->open_file_lock
);
462 list_for_each(tmp2
, &tcon
->openFileList
) {
463 netfile
= list_entry(tmp2
, struct cifsFileInfo
,
465 if (pSMB
->Fid
!= netfile
->fid
.netfid
)
468 cifs_dbg(FYI
, "file id match, oplock break\n");
469 pCifsInode
= CIFS_I(d_inode(netfile
->dentry
));
471 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
,
475 * Set flag if the server downgrades the oplock
478 if (pSMB
->OplockLevel
)
480 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2
,
484 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2
,
487 queue_work(cifsoplockd_wq
,
488 &netfile
->oplock_break
);
489 netfile
->oplock_break_cancelled
= false;
491 spin_unlock(&tcon
->open_file_lock
);
492 spin_unlock(&cifs_tcp_ses_lock
);
495 spin_unlock(&tcon
->open_file_lock
);
496 spin_unlock(&cifs_tcp_ses_lock
);
497 cifs_dbg(FYI
, "No matching file for oplock break\n");
501 spin_unlock(&cifs_tcp_ses_lock
);
502 cifs_dbg(FYI
, "Can not process oplock break for non-existent connection\n");
507 dump_smb(void *buf
, int smb_buf_length
)
512 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
, 8, 2, buf
,
513 smb_buf_length
, true);
517 cifs_autodisable_serverino(struct cifs_sb_info
*cifs_sb
)
519 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
520 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
521 cifs_dbg(VFS
, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
522 cifs_sb_master_tcon(cifs_sb
)->treeName
);
526 void cifs_set_oplock_level(struct cifsInodeInfo
*cinode
, __u32 oplock
)
530 if (oplock
== OPLOCK_EXCLUSIVE
) {
531 cinode
->oplock
= CIFS_CACHE_WRITE_FLG
| CIFS_CACHE_READ_FLG
;
532 cifs_dbg(FYI
, "Exclusive Oplock granted on inode %p\n",
534 } else if (oplock
== OPLOCK_READ
) {
535 cinode
->oplock
= CIFS_CACHE_READ_FLG
;
536 cifs_dbg(FYI
, "Level II Oplock granted on inode %p\n",
543 * We wait for oplock breaks to be processed before we attempt to perform
546 int cifs_get_writer(struct cifsInodeInfo
*cinode
)
551 rc
= wait_on_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
,
556 spin_lock(&cinode
->writers_lock
);
557 if (!cinode
->writers
)
558 set_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
560 /* Check to see if we have started servicing an oplock break */
561 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
)) {
563 if (cinode
->writers
== 0) {
564 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
565 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
567 spin_unlock(&cinode
->writers_lock
);
570 spin_unlock(&cinode
->writers_lock
);
574 void cifs_put_writer(struct cifsInodeInfo
*cinode
)
576 spin_lock(&cinode
->writers_lock
);
578 if (cinode
->writers
== 0) {
579 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
580 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
582 spin_unlock(&cinode
->writers_lock
);
585 void cifs_done_oplock_break(struct cifsInodeInfo
*cinode
)
587 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
);
588 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
);
592 backup_cred(struct cifs_sb_info
*cifs_sb
)
594 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPUID
) {
595 if (uid_eq(cifs_sb
->mnt_backupuid
, current_fsuid()))
598 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPGID
) {
599 if (in_group_p(cifs_sb
->mnt_backupgid
))
607 cifs_del_pending_open(struct cifs_pending_open
*open
)
609 spin_lock(&tlink_tcon(open
->tlink
)->open_file_lock
);
610 list_del(&open
->olist
);
611 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
615 cifs_add_pending_open_locked(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
616 struct cifs_pending_open
*open
)
618 memcpy(open
->lease_key
, fid
->lease_key
, SMB2_LEASE_KEY_SIZE
);
619 open
->oplock
= CIFS_OPLOCK_NO_CHANGE
;
621 fid
->pending_open
= open
;
622 list_add_tail(&open
->olist
, &tlink_tcon(tlink
)->pending_opens
);
626 cifs_add_pending_open(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
627 struct cifs_pending_open
*open
)
629 spin_lock(&tlink_tcon(tlink
)->open_file_lock
);
630 cifs_add_pending_open_locked(fid
, tlink
, open
);
631 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
634 /* parses DFS refferal V3 structure
635 * caller is responsible for freeing target_nodes
638 * - on failure - errno
641 parse_dfs_referrals(struct get_dfs_referral_rsp
*rsp
, u32 rsp_size
,
642 unsigned int *num_of_nodes
,
643 struct dfs_info3_param
**target_nodes
,
644 const struct nls_table
*nls_codepage
, int remap
,
645 const char *searchName
, bool is_unicode
)
649 struct dfs_referral_level_3
*ref
;
651 *num_of_nodes
= le16_to_cpu(rsp
->NumberOfReferrals
);
653 if (*num_of_nodes
< 1) {
654 cifs_dbg(VFS
, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
657 goto parse_DFS_referrals_exit
;
660 ref
= (struct dfs_referral_level_3
*) &(rsp
->referrals
);
661 if (ref
->VersionNumber
!= cpu_to_le16(3)) {
662 cifs_dbg(VFS
, "Referrals of V%d version are not supported, should be V3\n",
663 le16_to_cpu(ref
->VersionNumber
));
665 goto parse_DFS_referrals_exit
;
668 /* get the upper boundary of the resp buffer */
669 data_end
= (char *)rsp
+ rsp_size
;
671 cifs_dbg(FYI
, "num_referrals: %d dfs flags: 0x%x ...\n",
672 *num_of_nodes
, le32_to_cpu(rsp
->DFSFlags
));
674 *target_nodes
= kcalloc(*num_of_nodes
, sizeof(struct dfs_info3_param
),
676 if (*target_nodes
== NULL
) {
678 goto parse_DFS_referrals_exit
;
681 /* collect necessary data from referrals */
682 for (i
= 0; i
< *num_of_nodes
; i
++) {
685 struct dfs_info3_param
*node
= (*target_nodes
)+i
;
687 node
->flags
= le32_to_cpu(rsp
->DFSFlags
);
689 __le16
*tmp
= kmalloc(strlen(searchName
)*2 + 2,
693 goto parse_DFS_referrals_exit
;
695 cifsConvertToUTF16((__le16
*) tmp
, searchName
,
696 PATH_MAX
, nls_codepage
, remap
);
697 node
->path_consumed
= cifs_utf16_bytes(tmp
,
698 le16_to_cpu(rsp
->PathConsumed
),
702 node
->path_consumed
= le16_to_cpu(rsp
->PathConsumed
);
704 node
->server_type
= le16_to_cpu(ref
->ServerType
);
705 node
->ref_flag
= le16_to_cpu(ref
->ReferralEntryFlags
);
708 temp
= (char *)ref
+ le16_to_cpu(ref
->DfsPathOffset
);
709 max_len
= data_end
- temp
;
710 node
->path_name
= cifs_strndup_from_utf16(temp
, max_len
,
711 is_unicode
, nls_codepage
);
712 if (!node
->path_name
) {
714 goto parse_DFS_referrals_exit
;
717 /* copy link target UNC */
718 temp
= (char *)ref
+ le16_to_cpu(ref
->NetworkAddressOffset
);
719 max_len
= data_end
- temp
;
720 node
->node_name
= cifs_strndup_from_utf16(temp
, max_len
,
721 is_unicode
, nls_codepage
);
722 if (!node
->node_name
) {
724 goto parse_DFS_referrals_exit
;
730 parse_DFS_referrals_exit
:
732 free_dfs_info_array(*target_nodes
, *num_of_nodes
);
733 *target_nodes
= NULL
;
739 struct cifs_aio_ctx
*
740 cifs_aio_ctx_alloc(void)
742 struct cifs_aio_ctx
*ctx
;
744 ctx
= kzalloc(sizeof(struct cifs_aio_ctx
), GFP_KERNEL
);
748 INIT_LIST_HEAD(&ctx
->list
);
749 mutex_init(&ctx
->aio_mutex
);
750 init_completion(&ctx
->done
);
751 kref_init(&ctx
->refcount
);
756 cifs_aio_ctx_release(struct kref
*refcount
)
758 struct cifs_aio_ctx
*ctx
= container_of(refcount
,
759 struct cifs_aio_ctx
, refcount
);
761 cifsFileInfo_put(ctx
->cfile
);
766 #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
769 setup_aio_ctx_iter(struct cifs_aio_ctx
*ctx
, struct iov_iter
*iter
, int rw
)
772 unsigned int cur_npages
;
773 unsigned int npages
= 0;
776 size_t count
= iov_iter_count(iter
);
777 unsigned int saved_len
;
779 unsigned int max_pages
= iov_iter_npages(iter
, INT_MAX
);
780 struct page
**pages
= NULL
;
781 struct bio_vec
*bv
= NULL
;
783 if (iter
->type
& ITER_KVEC
) {
784 memcpy(&ctx
->iter
, iter
, sizeof(struct iov_iter
));
786 iov_iter_advance(iter
, count
);
790 if (max_pages
* sizeof(struct bio_vec
) <= CIFS_AIO_KMALLOC_LIMIT
)
791 bv
= kmalloc_array(max_pages
, sizeof(struct bio_vec
),
795 bv
= vmalloc(max_pages
* sizeof(struct bio_vec
));
800 if (max_pages
* sizeof(struct page
*) <= CIFS_AIO_KMALLOC_LIMIT
)
801 pages
= kmalloc_array(max_pages
, sizeof(struct page
*),
805 pages
= vmalloc(max_pages
* sizeof(struct page
*));
814 while (count
&& npages
< max_pages
) {
815 rc
= iov_iter_get_pages(iter
, pages
, count
, max_pages
, &start
);
817 cifs_dbg(VFS
, "couldn't get user pages (rc=%zd)\n", rc
);
822 cifs_dbg(VFS
, "get pages rc=%zd more than %zu\n", rc
,
827 iov_iter_advance(iter
, rc
);
830 cur_npages
= DIV_ROUND_UP(rc
, PAGE_SIZE
);
832 if (npages
+ cur_npages
> max_pages
) {
833 cifs_dbg(VFS
, "out of vec array capacity (%u vs %u)\n",
834 npages
+ cur_npages
, max_pages
);
838 for (i
= 0; i
< cur_npages
; i
++) {
839 len
= rc
> PAGE_SIZE
? PAGE_SIZE
: rc
;
840 bv
[npages
+ i
].bv_page
= pages
[i
];
841 bv
[npages
+ i
].bv_offset
= start
;
842 bv
[npages
+ i
].bv_len
= len
- start
;
847 npages
+= cur_npages
;
852 ctx
->len
= saved_len
- count
;
853 ctx
->npages
= npages
;
854 iov_iter_bvec(&ctx
->iter
, ITER_BVEC
| rw
, ctx
->bv
, npages
, ctx
->len
);