]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/misc.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
fb8c4b14 | 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
20 | */ |
21 | ||
22 | #include <linux/slab.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/mempool.h> | |
25 | #include "cifspdu.h" | |
26 | #include "cifsglob.h" | |
27 | #include "cifsproto.h" | |
28 | #include "cifs_debug.h" | |
29 | #include "smberr.h" | |
30 | #include "nterr.h" | |
6c91d362 | 31 | #include "cifs_unicode.h" |
3792c173 PS |
32 | #ifdef CONFIG_CIFS_SMB2 |
33 | #include "smb2pdu.h" | |
34 | #endif | |
1da177e4 LT |
35 | |
36 | extern mempool_t *cifs_sm_req_poolp; | |
37 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 38 | |
fb8c4b14 SF |
39 | /* The xid serves as a useful identifier for each incoming vfs request, |
40 | in a similar way to the mid which is useful to track each sent smb, | |
41 | and CurrentXid can also provide a running counter (although it | |
42 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
43 | since the cifs fs was mounted */ |
44 | ||
45 | unsigned int | |
6d5786a3 | 46 | _get_xid(void) |
1da177e4 LT |
47 | { |
48 | unsigned int xid; | |
49 | ||
50 | spin_lock(&GlobalMid_Lock); | |
51 | GlobalTotalActiveXid++; | |
50c2f753 SF |
52 | |
53 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 54 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 55 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 56 | if (GlobalTotalActiveXid > 65000) |
f96637be | 57 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
58 | xid = GlobalCurrentXid++; |
59 | spin_unlock(&GlobalMid_Lock); | |
60 | return xid; | |
61 | } | |
62 | ||
63 | void | |
6d5786a3 | 64 | _free_xid(unsigned int xid) |
1da177e4 LT |
65 | { |
66 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 67 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
68 | BUG(); */ |
69 | GlobalTotalActiveXid--; | |
70 | spin_unlock(&GlobalMid_Lock); | |
71 | } | |
72 | ||
96daf2b0 | 73 | struct cifs_ses * |
1da177e4 LT |
74 | sesInfoAlloc(void) |
75 | { | |
96daf2b0 | 76 | struct cifs_ses *ret_buf; |
1da177e4 | 77 | |
96daf2b0 | 78 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 79 | if (ret_buf) { |
1da177e4 LT |
80 | atomic_inc(&sesInfoAllocCount); |
81 | ret_buf->status = CifsNew; | |
14fbf50d JL |
82 | ++ret_buf->ses_count; |
83 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 84 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 85 | mutex_init(&ret_buf->session_mutex); |
1da177e4 LT |
86 | } |
87 | return ret_buf; | |
88 | } | |
89 | ||
90 | void | |
96daf2b0 | 91 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
92 | { |
93 | if (buf_to_free == NULL) { | |
f96637be | 94 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
95 | return; |
96 | } | |
97 | ||
1da177e4 | 98 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
99 | kfree(buf_to_free->serverOS); |
100 | kfree(buf_to_free->serverDomain); | |
101 | kfree(buf_to_free->serverNOS); | |
55162dec JL |
102 | if (buf_to_free->password) { |
103 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
104 | kfree(buf_to_free->password); | |
105 | } | |
8727c8a8 | 106 | kfree(buf_to_free->user_name); |
3979877e | 107 | kfree(buf_to_free->domainName); |
d4e63bd6 | 108 | kfree(buf_to_free->auth_key.response); |
1da177e4 LT |
109 | kfree(buf_to_free); |
110 | } | |
111 | ||
96daf2b0 | 112 | struct cifs_tcon * |
1da177e4 LT |
113 | tconInfoAlloc(void) |
114 | { | |
96daf2b0 SF |
115 | struct cifs_tcon *ret_buf; |
116 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 117 | if (ret_buf) { |
1da177e4 | 118 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 119 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 120 | ++ret_buf->tc_count; |
1da177e4 | 121 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 122 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
3afca265 | 123 | spin_lock_init(&ret_buf->open_file_lock); |
1da177e4 LT |
124 | #ifdef CONFIG_CIFS_STATS |
125 | spin_lock_init(&ret_buf->stat_lock); | |
126 | #endif | |
1da177e4 LT |
127 | } |
128 | return ret_buf; | |
129 | } | |
130 | ||
131 | void | |
96daf2b0 | 132 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
133 | { |
134 | if (buf_to_free == NULL) { | |
f96637be | 135 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
136 | return; |
137 | } | |
1da177e4 | 138 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 139 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
140 | if (buf_to_free->password) { |
141 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
142 | kfree(buf_to_free->password); | |
143 | } | |
1da177e4 LT |
144 | kfree(buf_to_free); |
145 | } | |
146 | ||
147 | struct smb_hdr * | |
148 | cifs_buf_get(void) | |
149 | { | |
150 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
151 | size_t buf_size = sizeof(struct smb_hdr); |
152 | ||
153 | #ifdef CONFIG_CIFS_SMB2 | |
154 | /* | |
155 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
156 | * more bytes for CIFS. | |
157 | */ | |
158 | buf_size = sizeof(struct smb2_hdr); | |
159 | #endif | |
160 | /* | |
161 | * We could use negotiated size instead of max_msgsize - | |
162 | * but it may be more efficient to always alloc same size | |
163 | * albeit slightly larger than necessary and maxbuffersize | |
164 | * defaults to this and can not be bigger. | |
165 | */ | |
232087cb | 166 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
167 | |
168 | /* clear the first few header bytes */ | |
169 | /* for most paths, more is cleared in header_assemble */ | |
170 | if (ret_buf) { | |
3792c173 | 171 | memset(ret_buf, 0, buf_size + 3); |
1da177e4 | 172 | atomic_inc(&bufAllocCount); |
4498eed5 SF |
173 | #ifdef CONFIG_CIFS_STATS2 |
174 | atomic_inc(&totBufAllocCount); | |
175 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
176 | } |
177 | ||
178 | return ret_buf; | |
179 | } | |
180 | ||
181 | void | |
182 | cifs_buf_release(void *buf_to_free) | |
183 | { | |
1da177e4 | 184 | if (buf_to_free == NULL) { |
f96637be | 185 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
186 | return; |
187 | } | |
fb8c4b14 | 188 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
189 | |
190 | atomic_dec(&bufAllocCount); | |
191 | return; | |
192 | } | |
193 | ||
194 | struct smb_hdr * | |
195 | cifs_small_buf_get(void) | |
196 | { | |
197 | struct smb_hdr *ret_buf = NULL; | |
198 | ||
fb8c4b14 SF |
199 | /* We could use negotiated size instead of max_msgsize - |
200 | but it may be more efficient to always alloc same size | |
201 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 202 | defaults to this and can not be bigger */ |
232087cb | 203 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
204 | if (ret_buf) { |
205 | /* No need to clear memory here, cleared in header assemble */ | |
206 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
207 | atomic_inc(&smBufAllocCount); | |
4498eed5 SF |
208 | #ifdef CONFIG_CIFS_STATS2 |
209 | atomic_inc(&totSmBufAllocCount); | |
210 | #endif /* CONFIG_CIFS_STATS2 */ | |
211 | ||
1da177e4 LT |
212 | } |
213 | return ret_buf; | |
214 | } | |
215 | ||
216 | void | |
217 | cifs_small_buf_release(void *buf_to_free) | |
218 | { | |
219 | ||
220 | if (buf_to_free == NULL) { | |
f96637be | 221 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
222 | return; |
223 | } | |
fb8c4b14 | 224 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
225 | |
226 | atomic_dec(&smBufAllocCount); | |
227 | return; | |
228 | } | |
229 | ||
6d81ed1e SP |
230 | void |
231 | free_rsp_buf(int resp_buftype, void *rsp) | |
232 | { | |
233 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
234 | cifs_small_buf_release(rsp); | |
235 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
236 | cifs_buf_release(rsp); | |
237 | } | |
238 | ||
1982c344 SF |
239 | /* NB: MID can not be set if treeCon not passed in, in that |
240 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
241 | void |
242 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 243 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
244 | /* length of fixed section (word count) in two byte units */) |
245 | { | |
1da177e4 LT |
246 | char *temp = (char *) buffer; |
247 | ||
fb8c4b14 | 248 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 249 | |
be8e3b00 | 250 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 251 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 252 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 253 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
254 | |
255 | buffer->Protocol[0] = 0xFF; | |
256 | buffer->Protocol[1] = 'S'; | |
257 | buffer->Protocol[2] = 'M'; | |
258 | buffer->Protocol[3] = 'B'; | |
259 | buffer->Command = smb_command; | |
260 | buffer->Flags = 0x00; /* case sensitive */ | |
261 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
262 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
263 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
264 | if (treeCon) { |
265 | buffer->Tid = treeCon->tid; | |
266 | if (treeCon->ses) { | |
267 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
268 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 269 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 270 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 271 | |
1982c344 SF |
272 | /* Uid is not converted */ |
273 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 274 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
275 | } |
276 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
277 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
278 | if (treeCon->nocase) |
279 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 280 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 281 | if (treeCon->ses->server->sign) |
1da177e4 LT |
282 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
283 | } | |
284 | ||
285 | /* endian conversion of flags is now done just before sending */ | |
286 | buffer->WordCount = (char) word_count; | |
287 | return; | |
288 | } | |
289 | ||
2cd646a2 | 290 | static int |
944d6f1a | 291 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 292 | { |
68abaffa JL |
293 | /* does it have the right SMB "signature" ? */ |
294 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
295 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
296 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
297 | return 1; |
298 | } | |
299 | ||
68abaffa JL |
300 | /* if it's a response then accept */ |
301 | if (smb->Flags & SMBFLG_RESPONSE) | |
302 | return 0; | |
303 | ||
304 | /* only one valid case where server sends us request */ | |
305 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
306 | return 0; | |
307 | ||
3d378d3f TG |
308 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
309 | get_mid(smb)); | |
1da177e4 LT |
310 | return 1; |
311 | } | |
312 | ||
313 | int | |
373512ec | 314 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 315 | { |
d4e4854f | 316 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 317 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 318 | __u32 clc_len; /* calculated length */ |
f96637be JP |
319 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
320 | total_read, rfclen); | |
d103e164 | 321 | |
376b43f4 JL |
322 | /* is this frame too small to even get to a BCC? */ |
323 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
324 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 325 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 326 | /* it's an error return */ |
d103e164 SF |
327 | smb->WordCount = 0; |
328 | /* some error cases do not return wct and bcc */ | |
329 | return 0; | |
376b43f4 | 330 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 331 | (smb->WordCount == 0)) { |
fb8c4b14 | 332 | char *tmp = (char *)smb; |
d103e164 SF |
333 | /* Need to work around a bug in two servers here */ |
334 | /* First, check if the part of bcc they sent was zero */ | |
335 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
336 | /* some servers return only half of bcc | |
337 | * on simple responses (wct, bcc both zero) | |
338 | * in particular have seen this on | |
339 | * ulogoffX and FindClose. This leaves | |
340 | * one byte of bcc potentially unitialized | |
341 | */ | |
342 | /* zero rest of bcc */ | |
343 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 344 | return 0; |
1da177e4 | 345 | } |
f96637be | 346 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 347 | } else { |
f96637be | 348 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 349 | } |
376b43f4 | 350 | return -EIO; |
1da177e4 LT |
351 | } |
352 | ||
376b43f4 | 353 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 354 | if (check_smb_hdr(smb)) |
376b43f4 | 355 | return -EIO; |
820a803f | 356 | clc_len = smbCalcSize(smb); |
184ed211 | 357 | |
376b43f4 | 358 | if (4 + rfclen != total_read) { |
f96637be JP |
359 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
360 | rfclen); | |
376b43f4 | 361 | return -EIO; |
184ed211 SF |
362 | } |
363 | ||
376b43f4 | 364 | if (4 + rfclen != clc_len) { |
3d378d3f | 365 | __u16 mid = get_mid(smb); |
184ed211 | 366 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 367 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 368 | /* check if lengths match mod 64K */ |
376b43f4 | 369 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 370 | return 0; /* bcc wrapped */ |
184ed211 | 371 | } |
f96637be | 372 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 373 | clc_len, 4 + rfclen, mid); |
6284644e | 374 | |
376b43f4 | 375 | if (4 + rfclen < clc_len) { |
f96637be | 376 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 377 | rfclen, mid); |
376b43f4 JL |
378 | return -EIO; |
379 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
380 | /* |
381 | * Some servers (Windows XP in particular) send more | |
382 | * data than the lengths in the SMB packet would | |
383 | * indicate on certain calls (byte range locks and | |
384 | * trans2 find first calls in particular). While the | |
385 | * client can handle such a frame by ignoring the | |
386 | * trailing data, we choose limit the amount of extra | |
387 | * data to 512 bytes. | |
388 | */ | |
f96637be | 389 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 390 | rfclen, mid); |
376b43f4 | 391 | return -EIO; |
46c79a64 | 392 | } |
1da177e4 | 393 | } |
20962438 | 394 | return 0; |
1da177e4 | 395 | } |
4b18f2a9 SF |
396 | |
397 | bool | |
d4e4854f | 398 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 399 | { |
d4e4854f | 400 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 401 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 402 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
403 | struct cifs_ses *ses; |
404 | struct cifs_tcon *tcon; | |
f1987b44 | 405 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
406 | struct cifsFileInfo *netfile; |
407 | ||
f96637be | 408 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 409 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 410 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 411 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 412 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 413 | struct file_notify_information *pnotify; |
1da177e4 | 414 | __u32 data_offset = 0; |
820a803f | 415 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
416 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
417 | ||
3979877e SF |
418 | pnotify = (struct file_notify_information *) |
419 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 420 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 421 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 422 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 423 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 424 | return true; |
1da177e4 | 425 | } |
790fe579 | 426 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 427 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 428 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 429 | return true; |
1da177e4 | 430 | } |
4b18f2a9 | 431 | return false; |
fb8c4b14 | 432 | } |
790fe579 | 433 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 434 | return false; |
790fe579 | 435 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
436 | /* no sense logging error on invalid handle on oplock |
437 | break - harmless race between close request and oplock | |
438 | break response is expected from time to time writing out | |
439 | large dirty files cached on the client */ | |
fb8c4b14 SF |
440 | if ((NT_STATUS_INVALID_HANDLE) == |
441 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 442 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 443 | return true; |
fb8c4b14 | 444 | } else if (ERRbadfid == |
1da177e4 | 445 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 446 | return true; |
1da177e4 | 447 | } else { |
4b18f2a9 | 448 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
449 | } |
450 | } | |
790fe579 | 451 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 452 | return false; |
1da177e4 | 453 | |
59b04c5d | 454 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 455 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 456 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 457 | return false; |
1da177e4 LT |
458 | |
459 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 460 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 461 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 462 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 463 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 464 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
465 | if (tcon->tid != buf->Tid) |
466 | continue; | |
467 | ||
44c58186 | 468 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 469 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
470 | list_for_each(tmp2, &tcon->openFileList) { |
471 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 472 | tlist); |
4b4de76e | 473 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
474 | continue; |
475 | ||
f96637be | 476 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 477 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 478 | |
c11f1df5 SP |
479 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
480 | &pCifsInode->flags); | |
481 | ||
482 | /* | |
483 | * Set flag if the server downgrades the oplock | |
484 | * to L2 else clear. | |
485 | */ | |
486 | if (pSMB->OplockLevel) | |
487 | set_bit( | |
488 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
489 | &pCifsInode->flags); | |
490 | else | |
491 | clear_bit( | |
492 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
493 | &pCifsInode->flags); | |
494 | ||
da472fc8 | 495 | queue_work(cifsiod_wq, |
ad635942 | 496 | &netfile->oplock_break); |
9b646972 TH |
497 | netfile->oplock_break_cancelled = false; |
498 | ||
3afca265 | 499 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 500 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 501 | return true; |
1da177e4 | 502 | } |
3afca265 | 503 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 504 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 505 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 506 | return true; |
1da177e4 LT |
507 | } |
508 | } | |
3f9bcca7 | 509 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 510 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 511 | return true; |
1da177e4 LT |
512 | } |
513 | ||
514 | void | |
792af7b0 | 515 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 516 | { |
1da177e4 LT |
517 | if (traceSMB == 0) |
518 | return; | |
519 | ||
55d83e0d AS |
520 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
521 | smb_buf_length, true); | |
1da177e4 | 522 | } |
6a0b4824 | 523 | |
ec06aedd JL |
524 | void |
525 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
526 | { | |
527 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 528 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
f96637be JP |
529 | 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", |
530 | cifs_sb_master_tcon(cifs_sb)->treeName); | |
ec06aedd JL |
531 | } |
532 | } | |
e66673e3 | 533 | |
c6723628 | 534 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 535 | { |
c6723628 | 536 | oplock &= 0xF; |
e66673e3 | 537 | |
c6723628 | 538 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 539 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
540 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
541 | &cinode->vfs_inode); | |
c6723628 | 542 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 543 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
544 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
545 | &cinode->vfs_inode); | |
18cceb6a PS |
546 | } else |
547 | cinode->oplock = 0; | |
e66673e3 | 548 | } |
3d3ea8e6 | 549 | |
c11f1df5 SP |
550 | /* |
551 | * We wait for oplock breaks to be processed before we attempt to perform | |
552 | * writes. | |
553 | */ | |
554 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
555 | { | |
556 | int rc; | |
557 | ||
558 | start: | |
559 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 560 | TASK_KILLABLE); |
c11f1df5 SP |
561 | if (rc) |
562 | return rc; | |
563 | ||
564 | spin_lock(&cinode->writers_lock); | |
565 | if (!cinode->writers) | |
566 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
567 | cinode->writers++; | |
568 | /* Check to see if we have started servicing an oplock break */ | |
569 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
570 | cinode->writers--; | |
571 | if (cinode->writers == 0) { | |
572 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
573 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
574 | } | |
575 | spin_unlock(&cinode->writers_lock); | |
576 | goto start; | |
577 | } | |
578 | spin_unlock(&cinode->writers_lock); | |
579 | return 0; | |
580 | } | |
581 | ||
582 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
583 | { | |
584 | spin_lock(&cinode->writers_lock); | |
585 | cinode->writers--; | |
586 | if (cinode->writers == 0) { | |
587 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
588 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
589 | } | |
590 | spin_unlock(&cinode->writers_lock); | |
591 | } | |
592 | ||
593 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) | |
594 | { | |
595 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
596 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
597 | } | |
598 | ||
3d3ea8e6 SP |
599 | bool |
600 | backup_cred(struct cifs_sb_info *cifs_sb) | |
601 | { | |
602 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 603 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
604 | return true; |
605 | } | |
606 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
607 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
608 | return true; | |
609 | } | |
610 | ||
611 | return false; | |
612 | } | |
233839b1 PS |
613 | |
614 | void | |
615 | cifs_del_pending_open(struct cifs_pending_open *open) | |
616 | { | |
3afca265 | 617 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 618 | list_del(&open->olist); |
3afca265 | 619 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
620 | } |
621 | ||
622 | void | |
623 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
624 | struct cifs_pending_open *open) | |
625 | { | |
626 | #ifdef CONFIG_CIFS_SMB2 | |
627 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); | |
628 | #endif | |
629 | open->oplock = CIFS_OPLOCK_NO_CHANGE; | |
630 | open->tlink = tlink; | |
631 | fid->pending_open = open; | |
632 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
633 | } | |
634 | ||
635 | void | |
636 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
637 | struct cifs_pending_open *open) | |
638 | { | |
3afca265 | 639 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 640 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 641 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 642 | } |