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"
33 #ifdef CONFIG_CIFS_SMB2
37 extern mempool_t
*cifs_sm_req_poolp
;
38 extern mempool_t
*cifs_req_poolp
;
40 /* The xid serves as a useful identifier for each incoming vfs request,
41 in a similar way to the mid which is useful to track each sent smb,
42 and CurrentXid can also provide a running counter (although it
43 will eventually wrap past zero) of the total vfs operations handled
44 since the cifs fs was mounted */
51 spin_lock(&GlobalMid_Lock
);
52 GlobalTotalActiveXid
++;
54 /* keep high water mark for number of simultaneous ops in filesystem */
55 if (GlobalTotalActiveXid
> GlobalMaxActiveXid
)
56 GlobalMaxActiveXid
= GlobalTotalActiveXid
;
57 if (GlobalTotalActiveXid
> 65000)
58 cifs_dbg(FYI
, "warning: more than 65000 requests active\n");
59 xid
= GlobalCurrentXid
++;
60 spin_unlock(&GlobalMid_Lock
);
65 _free_xid(unsigned int xid
)
67 spin_lock(&GlobalMid_Lock
);
68 /* if (GlobalTotalActiveXid == 0)
70 GlobalTotalActiveXid
--;
71 spin_unlock(&GlobalMid_Lock
);
77 struct cifs_ses
*ret_buf
;
79 ret_buf
= kzalloc(sizeof(struct cifs_ses
), GFP_KERNEL
);
81 atomic_inc(&sesInfoAllocCount
);
82 ret_buf
->status
= CifsNew
;
84 INIT_LIST_HEAD(&ret_buf
->smb_ses_list
);
85 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
86 mutex_init(&ret_buf
->session_mutex
);
92 sesInfoFree(struct cifs_ses
*buf_to_free
)
94 if (buf_to_free
== NULL
) {
95 cifs_dbg(FYI
, "Null buffer passed to sesInfoFree\n");
99 atomic_dec(&sesInfoAllocCount
);
100 kfree(buf_to_free
->serverOS
);
101 kfree(buf_to_free
->serverDomain
);
102 kfree(buf_to_free
->serverNOS
);
103 if (buf_to_free
->password
) {
104 memset(buf_to_free
->password
, 0, strlen(buf_to_free
->password
));
105 kfree(buf_to_free
->password
);
107 kfree(buf_to_free
->user_name
);
108 kfree(buf_to_free
->domainName
);
109 kfree(buf_to_free
->auth_key
.response
);
116 struct cifs_tcon
*ret_buf
;
117 ret_buf
= kzalloc(sizeof(struct cifs_tcon
), GFP_KERNEL
);
119 atomic_inc(&tconInfoAllocCount
);
120 ret_buf
->tidStatus
= CifsNew
;
122 INIT_LIST_HEAD(&ret_buf
->openFileList
);
123 INIT_LIST_HEAD(&ret_buf
->tcon_list
);
124 spin_lock_init(&ret_buf
->open_file_lock
);
125 #ifdef CONFIG_CIFS_STATS
126 spin_lock_init(&ret_buf
->stat_lock
);
133 tconInfoFree(struct cifs_tcon
*buf_to_free
)
135 if (buf_to_free
== NULL
) {
136 cifs_dbg(FYI
, "Null buffer passed to tconInfoFree\n");
139 atomic_dec(&tconInfoAllocCount
);
140 kfree(buf_to_free
->nativeFileSystem
);
141 if (buf_to_free
->password
) {
142 memset(buf_to_free
->password
, 0, strlen(buf_to_free
->password
));
143 kfree(buf_to_free
->password
);
151 struct smb_hdr
*ret_buf
= NULL
;
152 size_t buf_size
= sizeof(struct smb_hdr
);
154 #ifdef CONFIG_CIFS_SMB2
156 * SMB2 header is bigger than CIFS one - no problems to clean some
157 * more bytes for CIFS.
159 buf_size
= sizeof(struct smb2_hdr
);
162 * We could use negotiated size instead of max_msgsize -
163 * but it may be more efficient to always alloc same size
164 * albeit slightly larger than necessary and maxbuffersize
165 * defaults to this and can not be bigger.
167 ret_buf
= mempool_alloc(cifs_req_poolp
, GFP_NOFS
);
169 /* clear the first few header bytes */
170 /* for most paths, more is cleared in header_assemble */
171 memset(ret_buf
, 0, buf_size
+ 3);
172 atomic_inc(&bufAllocCount
);
173 #ifdef CONFIG_CIFS_STATS2
174 atomic_inc(&totBufAllocCount
);
175 #endif /* CONFIG_CIFS_STATS2 */
181 cifs_buf_release(void *buf_to_free
)
183 if (buf_to_free
== NULL
) {
184 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
187 mempool_free(buf_to_free
, cifs_req_poolp
);
189 atomic_dec(&bufAllocCount
);
194 cifs_small_buf_get(void)
196 struct smb_hdr
*ret_buf
= NULL
;
198 /* We could use negotiated size instead of max_msgsize -
199 but it may be more efficient to always alloc same size
200 albeit slightly larger than necessary and maxbuffersize
201 defaults to this and can not be bigger */
202 ret_buf
= mempool_alloc(cifs_sm_req_poolp
, GFP_NOFS
);
203 /* No need to clear memory here, cleared in header assemble */
204 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
205 atomic_inc(&smBufAllocCount
);
206 #ifdef CONFIG_CIFS_STATS2
207 atomic_inc(&totSmBufAllocCount
);
208 #endif /* CONFIG_CIFS_STATS2 */
214 cifs_small_buf_release(void *buf_to_free
)
217 if (buf_to_free
== NULL
) {
218 cifs_dbg(FYI
, "Null buffer passed to cifs_small_buf_release\n");
221 mempool_free(buf_to_free
, cifs_sm_req_poolp
);
223 atomic_dec(&smBufAllocCount
);
228 free_rsp_buf(int resp_buftype
, void *rsp
)
230 if (resp_buftype
== CIFS_SMALL_BUFFER
)
231 cifs_small_buf_release(rsp
);
232 else if (resp_buftype
== CIFS_LARGE_BUFFER
)
233 cifs_buf_release(rsp
);
236 /* NB: MID can not be set if treeCon not passed in, in that
237 case it is responsbility of caller to set the mid */
239 header_assemble(struct smb_hdr
*buffer
, char smb_command
/* command */ ,
240 const struct cifs_tcon
*treeCon
, int word_count
241 /* length of fixed section (word count) in two byte units */)
243 char *temp
= (char *) buffer
;
245 memset(temp
, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
247 buffer
->smb_buf_length
= cpu_to_be32(
248 (2 * word_count
) + sizeof(struct smb_hdr
) -
249 4 /* RFC 1001 length field does not count */ +
250 2 /* for bcc field itself */) ;
252 buffer
->Protocol
[0] = 0xFF;
253 buffer
->Protocol
[1] = 'S';
254 buffer
->Protocol
[2] = 'M';
255 buffer
->Protocol
[3] = 'B';
256 buffer
->Command
= smb_command
;
257 buffer
->Flags
= 0x00; /* case sensitive */
258 buffer
->Flags2
= SMBFLG2_KNOWS_LONG_NAMES
;
259 buffer
->Pid
= cpu_to_le16((__u16
)current
->tgid
);
260 buffer
->PidHigh
= cpu_to_le16((__u16
)(current
->tgid
>> 16));
262 buffer
->Tid
= treeCon
->tid
;
264 if (treeCon
->ses
->capabilities
& CAP_UNICODE
)
265 buffer
->Flags2
|= SMBFLG2_UNICODE
;
266 if (treeCon
->ses
->capabilities
& CAP_STATUS32
)
267 buffer
->Flags2
|= SMBFLG2_ERR_STATUS
;
269 /* Uid is not converted */
270 buffer
->Uid
= treeCon
->ses
->Suid
;
271 buffer
->Mid
= get_next_mid(treeCon
->ses
->server
);
273 if (treeCon
->Flags
& SMB_SHARE_IS_IN_DFS
)
274 buffer
->Flags2
|= SMBFLG2_DFS
;
276 buffer
->Flags
|= SMBFLG_CASELESS
;
277 if ((treeCon
->ses
) && (treeCon
->ses
->server
))
278 if (treeCon
->ses
->server
->sign
)
279 buffer
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
282 /* endian conversion of flags is now done just before sending */
283 buffer
->WordCount
= (char) word_count
;
288 check_smb_hdr(struct smb_hdr
*smb
)
290 /* does it have the right SMB "signature" ? */
291 if (*(__le32
*) smb
->Protocol
!= cpu_to_le32(0x424d53ff)) {
292 cifs_dbg(VFS
, "Bad protocol string signature header 0x%x\n",
293 *(unsigned int *)smb
->Protocol
);
297 /* if it's a response then accept */
298 if (smb
->Flags
& SMBFLG_RESPONSE
)
301 /* only one valid case where server sends us request */
302 if (smb
->Command
== SMB_COM_LOCKING_ANDX
)
305 cifs_dbg(VFS
, "Server sent request, not response. mid=%u\n",
311 checkSMB(char *buf
, unsigned int total_read
, struct TCP_Server_Info
*server
)
313 struct smb_hdr
*smb
= (struct smb_hdr
*)buf
;
314 __u32 rfclen
= be32_to_cpu(smb
->smb_buf_length
);
315 __u32 clc_len
; /* calculated length */
316 cifs_dbg(FYI
, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
319 /* is this frame too small to even get to a BCC? */
320 if (total_read
< 2 + sizeof(struct smb_hdr
)) {
321 if ((total_read
>= sizeof(struct smb_hdr
) - 1)
322 && (smb
->Status
.CifsError
!= 0)) {
323 /* it's an error return */
325 /* some error cases do not return wct and bcc */
327 } else if ((total_read
== sizeof(struct smb_hdr
) + 1) &&
328 (smb
->WordCount
== 0)) {
329 char *tmp
= (char *)smb
;
330 /* Need to work around a bug in two servers here */
331 /* First, check if the part of bcc they sent was zero */
332 if (tmp
[sizeof(struct smb_hdr
)] == 0) {
333 /* some servers return only half of bcc
334 * on simple responses (wct, bcc both zero)
335 * in particular have seen this on
336 * ulogoffX and FindClose. This leaves
337 * one byte of bcc potentially unitialized
339 /* zero rest of bcc */
340 tmp
[sizeof(struct smb_hdr
)+1] = 0;
343 cifs_dbg(VFS
, "rcvd invalid byte count (bcc)\n");
345 cifs_dbg(VFS
, "Length less than smb header size\n");
350 /* otherwise, there is enough to get to the BCC */
351 if (check_smb_hdr(smb
))
353 clc_len
= smbCalcSize(smb
);
355 if (4 + rfclen
!= total_read
) {
356 cifs_dbg(VFS
, "Length read does not match RFC1001 length %d\n",
361 if (4 + rfclen
!= clc_len
) {
362 __u16 mid
= get_mid(smb
);
363 /* check if bcc wrapped around for large read responses */
364 if ((rfclen
> 64 * 1024) && (rfclen
> clc_len
)) {
365 /* check if lengths match mod 64K */
366 if (((4 + rfclen
) & 0xFFFF) == (clc_len
& 0xFFFF))
367 return 0; /* bcc wrapped */
369 cifs_dbg(FYI
, "Calculated size %u vs length %u mismatch for mid=%u\n",
370 clc_len
, 4 + rfclen
, mid
);
372 if (4 + rfclen
< clc_len
) {
373 cifs_dbg(VFS
, "RFC1001 size %u smaller than SMB for mid=%u\n",
376 } else if (rfclen
> clc_len
+ 512) {
378 * Some servers (Windows XP in particular) send more
379 * data than the lengths in the SMB packet would
380 * indicate on certain calls (byte range locks and
381 * trans2 find first calls in particular). While the
382 * client can handle such a frame by ignoring the
383 * trailing data, we choose limit the amount of extra
386 cifs_dbg(VFS
, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
395 is_valid_oplock_break(char *buffer
, struct TCP_Server_Info
*srv
)
397 struct smb_hdr
*buf
= (struct smb_hdr
*)buffer
;
398 struct smb_com_lock_req
*pSMB
= (struct smb_com_lock_req
*)buf
;
399 struct list_head
*tmp
, *tmp1
, *tmp2
;
400 struct cifs_ses
*ses
;
401 struct cifs_tcon
*tcon
;
402 struct cifsInodeInfo
*pCifsInode
;
403 struct cifsFileInfo
*netfile
;
405 cifs_dbg(FYI
, "Checking for oplock break or dnotify response\n");
406 if ((pSMB
->hdr
.Command
== SMB_COM_NT_TRANSACT
) &&
407 (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
)) {
408 struct smb_com_transaction_change_notify_rsp
*pSMBr
=
409 (struct smb_com_transaction_change_notify_rsp
*)buf
;
410 struct file_notify_information
*pnotify
;
411 __u32 data_offset
= 0;
412 if (get_bcc(buf
) > sizeof(struct file_notify_information
)) {
413 data_offset
= le32_to_cpu(pSMBr
->DataOffset
);
415 pnotify
= (struct file_notify_information
*)
416 ((char *)&pSMBr
->hdr
.Protocol
+ data_offset
);
417 cifs_dbg(FYI
, "dnotify on %s Action: 0x%x\n",
418 pnotify
->FileName
, pnotify
->Action
);
419 /* cifs_dump_mem("Rcvd notify Data: ",buf,
420 sizeof(struct smb_hdr)+60); */
423 if (pSMBr
->hdr
.Status
.CifsError
) {
424 cifs_dbg(FYI
, "notify err 0x%x\n",
425 pSMBr
->hdr
.Status
.CifsError
);
430 if (pSMB
->hdr
.Command
!= SMB_COM_LOCKING_ANDX
)
432 if (pSMB
->hdr
.Flags
& SMBFLG_RESPONSE
) {
433 /* no sense logging error on invalid handle on oplock
434 break - harmless race between close request and oplock
435 break response is expected from time to time writing out
436 large dirty files cached on the client */
437 if ((NT_STATUS_INVALID_HANDLE
) ==
438 le32_to_cpu(pSMB
->hdr
.Status
.CifsError
)) {
439 cifs_dbg(FYI
, "invalid handle on oplock break\n");
441 } else if (ERRbadfid
==
442 le16_to_cpu(pSMB
->hdr
.Status
.DosError
.Error
)) {
445 return false; /* on valid oplock brk we get "request" */
448 if (pSMB
->hdr
.WordCount
!= 8)
451 cifs_dbg(FYI
, "oplock type 0x%x level 0x%x\n",
452 pSMB
->LockType
, pSMB
->OplockLevel
);
453 if (!(pSMB
->LockType
& LOCKING_ANDX_OPLOCK_RELEASE
))
456 /* look up tcon based on tid & uid */
457 spin_lock(&cifs_tcp_ses_lock
);
458 list_for_each(tmp
, &srv
->smb_ses_list
) {
459 ses
= list_entry(tmp
, struct cifs_ses
, smb_ses_list
);
460 list_for_each(tmp1
, &ses
->tcon_list
) {
461 tcon
= list_entry(tmp1
, struct cifs_tcon
, tcon_list
);
462 if (tcon
->tid
!= buf
->Tid
)
465 cifs_stats_inc(&tcon
->stats
.cifs_stats
.num_oplock_brks
);
466 spin_lock(&tcon
->open_file_lock
);
467 list_for_each(tmp2
, &tcon
->openFileList
) {
468 netfile
= list_entry(tmp2
, struct cifsFileInfo
,
470 if (pSMB
->Fid
!= netfile
->fid
.netfid
)
473 cifs_dbg(FYI
, "file id match, oplock break\n");
474 pCifsInode
= CIFS_I(d_inode(netfile
->dentry
));
476 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
,
480 * Set flag if the server downgrades the oplock
483 if (pSMB
->OplockLevel
)
485 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2
,
489 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2
,
492 queue_work(cifsoplockd_wq
,
493 &netfile
->oplock_break
);
494 netfile
->oplock_break_cancelled
= false;
496 spin_unlock(&tcon
->open_file_lock
);
497 spin_unlock(&cifs_tcp_ses_lock
);
500 spin_unlock(&tcon
->open_file_lock
);
501 spin_unlock(&cifs_tcp_ses_lock
);
502 cifs_dbg(FYI
, "No matching file for oplock break\n");
506 spin_unlock(&cifs_tcp_ses_lock
);
507 cifs_dbg(FYI
, "Can not process oplock break for non-existent connection\n");
512 dump_smb(void *buf
, int smb_buf_length
)
517 print_hex_dump(KERN_DEBUG
, "", DUMP_PREFIX_NONE
, 8, 2, buf
,
518 smb_buf_length
, true);
522 cifs_autodisable_serverino(struct cifs_sb_info
*cifs_sb
)
524 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
525 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
526 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",
527 cifs_sb_master_tcon(cifs_sb
)->treeName
);
531 void cifs_set_oplock_level(struct cifsInodeInfo
*cinode
, __u32 oplock
)
535 if (oplock
== OPLOCK_EXCLUSIVE
) {
536 cinode
->oplock
= CIFS_CACHE_WRITE_FLG
| CIFS_CACHE_READ_FLG
;
537 cifs_dbg(FYI
, "Exclusive Oplock granted on inode %p\n",
539 } else if (oplock
== OPLOCK_READ
) {
540 cinode
->oplock
= CIFS_CACHE_READ_FLG
;
541 cifs_dbg(FYI
, "Level II Oplock granted on inode %p\n",
548 * We wait for oplock breaks to be processed before we attempt to perform
551 int cifs_get_writer(struct cifsInodeInfo
*cinode
)
556 rc
= wait_on_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
,
561 spin_lock(&cinode
->writers_lock
);
562 if (!cinode
->writers
)
563 set_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
565 /* Check to see if we have started servicing an oplock break */
566 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
)) {
568 if (cinode
->writers
== 0) {
569 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
570 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
572 spin_unlock(&cinode
->writers_lock
);
575 spin_unlock(&cinode
->writers_lock
);
579 void cifs_put_writer(struct cifsInodeInfo
*cinode
)
581 spin_lock(&cinode
->writers_lock
);
583 if (cinode
->writers
== 0) {
584 clear_bit(CIFS_INODE_PENDING_WRITERS
, &cinode
->flags
);
585 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_WRITERS
);
587 spin_unlock(&cinode
->writers_lock
);
590 void cifs_done_oplock_break(struct cifsInodeInfo
*cinode
)
592 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK
, &cinode
->flags
);
593 wake_up_bit(&cinode
->flags
, CIFS_INODE_PENDING_OPLOCK_BREAK
);
597 backup_cred(struct cifs_sb_info
*cifs_sb
)
599 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPUID
) {
600 if (uid_eq(cifs_sb
->mnt_backupuid
, current_fsuid()))
603 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPGID
) {
604 if (in_group_p(cifs_sb
->mnt_backupgid
))
612 cifs_del_pending_open(struct cifs_pending_open
*open
)
614 spin_lock(&tlink_tcon(open
->tlink
)->open_file_lock
);
615 list_del(&open
->olist
);
616 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
620 cifs_add_pending_open_locked(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
621 struct cifs_pending_open
*open
)
623 #ifdef CONFIG_CIFS_SMB2
624 memcpy(open
->lease_key
, fid
->lease_key
, SMB2_LEASE_KEY_SIZE
);
626 open
->oplock
= CIFS_OPLOCK_NO_CHANGE
;
628 fid
->pending_open
= open
;
629 list_add_tail(&open
->olist
, &tlink_tcon(tlink
)->pending_opens
);
633 cifs_add_pending_open(struct cifs_fid
*fid
, struct tcon_link
*tlink
,
634 struct cifs_pending_open
*open
)
636 spin_lock(&tlink_tcon(tlink
)->open_file_lock
);
637 cifs_add_pending_open_locked(fid
, tlink
, open
);
638 spin_unlock(&tlink_tcon(open
->tlink
)->open_file_lock
);
641 /* parses DFS refferal V3 structure
642 * caller is responsible for freeing target_nodes
645 * - on failure - errno
648 parse_dfs_referrals(struct get_dfs_referral_rsp
*rsp
, u32 rsp_size
,
649 unsigned int *num_of_nodes
,
650 struct dfs_info3_param
**target_nodes
,
651 const struct nls_table
*nls_codepage
, int remap
,
652 const char *searchName
, bool is_unicode
)
656 struct dfs_referral_level_3
*ref
;
658 *num_of_nodes
= le16_to_cpu(rsp
->NumberOfReferrals
);
660 if (*num_of_nodes
< 1) {
661 cifs_dbg(VFS
, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
664 goto parse_DFS_referrals_exit
;
667 ref
= (struct dfs_referral_level_3
*) &(rsp
->referrals
);
668 if (ref
->VersionNumber
!= cpu_to_le16(3)) {
669 cifs_dbg(VFS
, "Referrals of V%d version are not supported, should be V3\n",
670 le16_to_cpu(ref
->VersionNumber
));
672 goto parse_DFS_referrals_exit
;
675 /* get the upper boundary of the resp buffer */
676 data_end
= (char *)rsp
+ rsp_size
;
678 cifs_dbg(FYI
, "num_referrals: %d dfs flags: 0x%x ...\n",
679 *num_of_nodes
, le32_to_cpu(rsp
->DFSFlags
));
681 *target_nodes
= kcalloc(*num_of_nodes
, sizeof(struct dfs_info3_param
),
683 if (*target_nodes
== NULL
) {
685 goto parse_DFS_referrals_exit
;
688 /* collect necessary data from referrals */
689 for (i
= 0; i
< *num_of_nodes
; i
++) {
692 struct dfs_info3_param
*node
= (*target_nodes
)+i
;
694 node
->flags
= le32_to_cpu(rsp
->DFSFlags
);
696 __le16
*tmp
= kmalloc(strlen(searchName
)*2 + 2,
700 goto parse_DFS_referrals_exit
;
702 cifsConvertToUTF16((__le16
*) tmp
, searchName
,
703 PATH_MAX
, nls_codepage
, remap
);
704 node
->path_consumed
= cifs_utf16_bytes(tmp
,
705 le16_to_cpu(rsp
->PathConsumed
),
709 node
->path_consumed
= le16_to_cpu(rsp
->PathConsumed
);
711 node
->server_type
= le16_to_cpu(ref
->ServerType
);
712 node
->ref_flag
= le16_to_cpu(ref
->ReferralEntryFlags
);
715 temp
= (char *)ref
+ le16_to_cpu(ref
->DfsPathOffset
);
716 max_len
= data_end
- temp
;
717 node
->path_name
= cifs_strndup_from_utf16(temp
, max_len
,
718 is_unicode
, nls_codepage
);
719 if (!node
->path_name
) {
721 goto parse_DFS_referrals_exit
;
724 /* copy link target UNC */
725 temp
= (char *)ref
+ le16_to_cpu(ref
->NetworkAddressOffset
);
726 max_len
= data_end
- temp
;
727 node
->node_name
= cifs_strndup_from_utf16(temp
, max_len
,
728 is_unicode
, nls_codepage
);
729 if (!node
->node_name
) {
731 goto parse_DFS_referrals_exit
;
737 parse_DFS_referrals_exit
:
739 free_dfs_info_array(*target_nodes
, *num_of_nodes
);
740 *target_nodes
= NULL
;
746 struct cifs_aio_ctx
*
747 cifs_aio_ctx_alloc(void)
749 struct cifs_aio_ctx
*ctx
;
751 ctx
= kzalloc(sizeof(struct cifs_aio_ctx
), GFP_KERNEL
);
755 INIT_LIST_HEAD(&ctx
->list
);
756 mutex_init(&ctx
->aio_mutex
);
757 init_completion(&ctx
->done
);
758 kref_init(&ctx
->refcount
);
763 cifs_aio_ctx_release(struct kref
*refcount
)
765 struct cifs_aio_ctx
*ctx
= container_of(refcount
,
766 struct cifs_aio_ctx
, refcount
);
768 cifsFileInfo_put(ctx
->cfile
);
773 #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
776 setup_aio_ctx_iter(struct cifs_aio_ctx
*ctx
, struct iov_iter
*iter
, int rw
)
779 unsigned int cur_npages
;
780 unsigned int npages
= 0;
783 size_t count
= iov_iter_count(iter
);
784 unsigned int saved_len
;
786 unsigned int max_pages
= iov_iter_npages(iter
, INT_MAX
);
787 struct page
**pages
= NULL
;
788 struct bio_vec
*bv
= NULL
;
790 if (iter
->type
& ITER_KVEC
) {
791 memcpy(&ctx
->iter
, iter
, sizeof(struct iov_iter
));
793 iov_iter_advance(iter
, count
);
797 if (max_pages
* sizeof(struct bio_vec
) <= CIFS_AIO_KMALLOC_LIMIT
)
798 bv
= kmalloc_array(max_pages
, sizeof(struct bio_vec
),
802 bv
= vmalloc(max_pages
* sizeof(struct bio_vec
));
807 if (max_pages
* sizeof(struct page
*) <= CIFS_AIO_KMALLOC_LIMIT
)
808 pages
= kmalloc_array(max_pages
, sizeof(struct page
*),
812 pages
= vmalloc(max_pages
* sizeof(struct page
*));
821 while (count
&& npages
< max_pages
) {
822 rc
= iov_iter_get_pages(iter
, pages
, count
, max_pages
, &start
);
824 cifs_dbg(VFS
, "couldn't get user pages (rc=%zd)\n", rc
);
829 cifs_dbg(VFS
, "get pages rc=%zd more than %zu\n", rc
,
834 iov_iter_advance(iter
, rc
);
837 cur_npages
= DIV_ROUND_UP(rc
, PAGE_SIZE
);
839 if (npages
+ cur_npages
> max_pages
) {
840 cifs_dbg(VFS
, "out of vec array capacity (%u vs %u)\n",
841 npages
+ cur_npages
, max_pages
);
845 for (i
= 0; i
< cur_npages
; i
++) {
846 len
= rc
> PAGE_SIZE
? PAGE_SIZE
: rc
;
847 bv
[npages
+ i
].bv_page
= pages
[i
];
848 bv
[npages
+ i
].bv_offset
= start
;
849 bv
[npages
+ i
].bv_len
= len
- start
;
854 npages
+= cur_npages
;
859 ctx
->len
= saved_len
- count
;
860 ctx
->npages
= npages
;
861 iov_iter_bvec(&ctx
->iter
, ITER_BVEC
| rw
, ctx
->bv
, npages
, ctx
->len
);