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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); |
1da177e4 LT |
108 | kfree(buf_to_free); |
109 | } | |
110 | ||
96daf2b0 | 111 | struct cifs_tcon * |
1da177e4 LT |
112 | tconInfoAlloc(void) |
113 | { | |
96daf2b0 SF |
114 | struct cifs_tcon *ret_buf; |
115 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 116 | if (ret_buf) { |
1da177e4 | 117 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 118 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 119 | ++ret_buf->tc_count; |
1da177e4 | 120 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 121 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
1da177e4 LT |
122 | #ifdef CONFIG_CIFS_STATS |
123 | spin_lock_init(&ret_buf->stat_lock); | |
124 | #endif | |
1da177e4 LT |
125 | } |
126 | return ret_buf; | |
127 | } | |
128 | ||
129 | void | |
96daf2b0 | 130 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
131 | { |
132 | if (buf_to_free == NULL) { | |
f96637be | 133 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
134 | return; |
135 | } | |
1da177e4 | 136 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 137 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
138 | if (buf_to_free->password) { |
139 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
140 | kfree(buf_to_free->password); | |
141 | } | |
1da177e4 LT |
142 | kfree(buf_to_free); |
143 | } | |
144 | ||
145 | struct smb_hdr * | |
146 | cifs_buf_get(void) | |
147 | { | |
148 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
149 | size_t buf_size = sizeof(struct smb_hdr); |
150 | ||
151 | #ifdef CONFIG_CIFS_SMB2 | |
152 | /* | |
153 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
154 | * more bytes for CIFS. | |
155 | */ | |
156 | buf_size = sizeof(struct smb2_hdr); | |
157 | #endif | |
158 | /* | |
159 | * We could use negotiated size instead of max_msgsize - | |
160 | * but it may be more efficient to always alloc same size | |
161 | * albeit slightly larger than necessary and maxbuffersize | |
162 | * defaults to this and can not be bigger. | |
163 | */ | |
232087cb | 164 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
165 | |
166 | /* clear the first few header bytes */ | |
167 | /* for most paths, more is cleared in header_assemble */ | |
168 | if (ret_buf) { | |
3792c173 | 169 | memset(ret_buf, 0, buf_size + 3); |
1da177e4 | 170 | atomic_inc(&bufAllocCount); |
4498eed5 SF |
171 | #ifdef CONFIG_CIFS_STATS2 |
172 | atomic_inc(&totBufAllocCount); | |
173 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
174 | } |
175 | ||
176 | return ret_buf; | |
177 | } | |
178 | ||
179 | void | |
180 | cifs_buf_release(void *buf_to_free) | |
181 | { | |
1da177e4 | 182 | if (buf_to_free == NULL) { |
f96637be | 183 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
184 | return; |
185 | } | |
fb8c4b14 | 186 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
187 | |
188 | atomic_dec(&bufAllocCount); | |
189 | return; | |
190 | } | |
191 | ||
192 | struct smb_hdr * | |
193 | cifs_small_buf_get(void) | |
194 | { | |
195 | struct smb_hdr *ret_buf = NULL; | |
196 | ||
fb8c4b14 SF |
197 | /* We could use negotiated size instead of max_msgsize - |
198 | but it may be more efficient to always alloc same size | |
199 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 200 | defaults to this and can not be bigger */ |
232087cb | 201 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
202 | if (ret_buf) { |
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); | |
4498eed5 SF |
206 | #ifdef CONFIG_CIFS_STATS2 |
207 | atomic_inc(&totSmBufAllocCount); | |
208 | #endif /* CONFIG_CIFS_STATS2 */ | |
209 | ||
1da177e4 LT |
210 | } |
211 | return ret_buf; | |
212 | } | |
213 | ||
214 | void | |
215 | cifs_small_buf_release(void *buf_to_free) | |
216 | { | |
217 | ||
218 | if (buf_to_free == NULL) { | |
f96637be | 219 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
220 | return; |
221 | } | |
fb8c4b14 | 222 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
223 | |
224 | atomic_dec(&smBufAllocCount); | |
225 | return; | |
226 | } | |
227 | ||
1982c344 SF |
228 | /* NB: MID can not be set if treeCon not passed in, in that |
229 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
230 | void |
231 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 232 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
233 | /* length of fixed section (word count) in two byte units */) |
234 | { | |
1da177e4 LT |
235 | char *temp = (char *) buffer; |
236 | ||
fb8c4b14 | 237 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 238 | |
be8e3b00 | 239 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 240 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 241 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 242 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
243 | |
244 | buffer->Protocol[0] = 0xFF; | |
245 | buffer->Protocol[1] = 'S'; | |
246 | buffer->Protocol[2] = 'M'; | |
247 | buffer->Protocol[3] = 'B'; | |
248 | buffer->Command = smb_command; | |
249 | buffer->Flags = 0x00; /* case sensitive */ | |
250 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
251 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
252 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
253 | if (treeCon) { |
254 | buffer->Tid = treeCon->tid; | |
255 | if (treeCon->ses) { | |
256 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
257 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 258 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 259 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 260 | |
1982c344 SF |
261 | /* Uid is not converted */ |
262 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 263 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
264 | } |
265 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
266 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
267 | if (treeCon->nocase) |
268 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 269 | if ((treeCon->ses) && (treeCon->ses->server)) |
96daf2b0 | 270 | if (treeCon->ses->server->sec_mode & |
1da177e4 LT |
271 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
272 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
273 | } | |
274 | ||
275 | /* endian conversion of flags is now done just before sending */ | |
276 | buffer->WordCount = (char) word_count; | |
277 | return; | |
278 | } | |
279 | ||
2cd646a2 | 280 | static int |
68abaffa | 281 | check_smb_hdr(struct smb_hdr *smb, __u16 mid) |
1da177e4 | 282 | { |
68abaffa JL |
283 | /* does it have the right SMB "signature" ? */ |
284 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
285 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
286 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
287 | return 1; |
288 | } | |
289 | ||
290 | /* Make sure that message ids match */ | |
291 | if (mid != smb->Mid) { | |
f96637be JP |
292 | cifs_dbg(VFS, "Mids do not match. received=%u expected=%u\n", |
293 | smb->Mid, mid); | |
68abaffa | 294 | return 1; |
1da177e4 | 295 | } |
68abaffa JL |
296 | |
297 | /* if it's a response then accept */ | |
298 | if (smb->Flags & SMBFLG_RESPONSE) | |
299 | return 0; | |
300 | ||
301 | /* only one valid case where server sends us request */ | |
302 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
303 | return 0; | |
304 | ||
f96637be | 305 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", smb->Mid); |
1da177e4 LT |
306 | return 1; |
307 | } | |
308 | ||
309 | int | |
d4e4854f | 310 | checkSMB(char *buf, unsigned int total_read) |
1da177e4 | 311 | { |
d4e4854f PS |
312 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
313 | __u16 mid = smb->Mid; | |
376b43f4 | 314 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 315 | __u32 clc_len; /* calculated length */ |
f96637be JP |
316 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
317 | total_read, rfclen); | |
d103e164 | 318 | |
376b43f4 JL |
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) | |
1da177e4 | 322 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 323 | /* it's an error return */ |
d103e164 SF |
324 | smb->WordCount = 0; |
325 | /* some error cases do not return wct and bcc */ | |
326 | return 0; | |
376b43f4 | 327 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 328 | (smb->WordCount == 0)) { |
fb8c4b14 | 329 | char *tmp = (char *)smb; |
d103e164 SF |
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 | |
338 | */ | |
339 | /* zero rest of bcc */ | |
340 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 341 | return 0; |
1da177e4 | 342 | } |
f96637be | 343 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 344 | } else { |
f96637be | 345 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 346 | } |
376b43f4 | 347 | return -EIO; |
1da177e4 LT |
348 | } |
349 | ||
376b43f4 | 350 | /* otherwise, there is enough to get to the BCC */ |
68abaffa | 351 | if (check_smb_hdr(smb, mid)) |
376b43f4 | 352 | return -EIO; |
820a803f | 353 | clc_len = smbCalcSize(smb); |
184ed211 | 354 | |
376b43f4 | 355 | if (4 + rfclen != total_read) { |
f96637be JP |
356 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
357 | rfclen); | |
376b43f4 | 358 | return -EIO; |
184ed211 SF |
359 | } |
360 | ||
376b43f4 | 361 | if (4 + rfclen != clc_len) { |
184ed211 | 362 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 363 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 364 | /* check if lengths match mod 64K */ |
376b43f4 | 365 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 366 | return 0; /* bcc wrapped */ |
184ed211 | 367 | } |
f96637be JP |
368 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
369 | clc_len, 4 + rfclen, smb->Mid); | |
6284644e | 370 | |
376b43f4 | 371 | if (4 + rfclen < clc_len) { |
f96637be JP |
372 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
373 | rfclen, smb->Mid); | |
376b43f4 JL |
374 | return -EIO; |
375 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
376 | /* |
377 | * Some servers (Windows XP in particular) send more | |
378 | * data than the lengths in the SMB packet would | |
379 | * indicate on certain calls (byte range locks and | |
380 | * trans2 find first calls in particular). While the | |
381 | * client can handle such a frame by ignoring the | |
382 | * trailing data, we choose limit the amount of extra | |
383 | * data to 512 bytes. | |
384 | */ | |
f96637be JP |
385 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
386 | rfclen, smb->Mid); | |
376b43f4 | 387 | return -EIO; |
46c79a64 | 388 | } |
1da177e4 | 389 | } |
20962438 | 390 | return 0; |
1da177e4 | 391 | } |
4b18f2a9 SF |
392 | |
393 | bool | |
d4e4854f | 394 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 395 | { |
d4e4854f | 396 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 397 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 398 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
399 | struct cifs_ses *ses; |
400 | struct cifs_tcon *tcon; | |
f1987b44 | 401 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
402 | struct cifsFileInfo *netfile; |
403 | ||
f96637be | 404 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 405 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 406 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 407 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 408 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 409 | struct file_notify_information *pnotify; |
1da177e4 | 410 | __u32 data_offset = 0; |
820a803f | 411 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
412 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
413 | ||
3979877e SF |
414 | pnotify = (struct file_notify_information *) |
415 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 416 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 417 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 418 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 419 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 420 | return true; |
1da177e4 | 421 | } |
790fe579 | 422 | if (pSMBr->hdr.Status.CifsError) { |
f96637be JP |
423 | cifs_dbg(FYI, "notify err 0x%d\n", |
424 | pSMBr->hdr.Status.CifsError); | |
4b18f2a9 | 425 | return true; |
1da177e4 | 426 | } |
4b18f2a9 | 427 | return false; |
fb8c4b14 | 428 | } |
790fe579 | 429 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 430 | return false; |
790fe579 | 431 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
432 | /* no sense logging error on invalid handle on oplock |
433 | break - harmless race between close request and oplock | |
434 | break response is expected from time to time writing out | |
435 | large dirty files cached on the client */ | |
fb8c4b14 SF |
436 | if ((NT_STATUS_INVALID_HANDLE) == |
437 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 438 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 439 | return true; |
fb8c4b14 | 440 | } else if (ERRbadfid == |
1da177e4 | 441 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 442 | return true; |
1da177e4 | 443 | } else { |
4b18f2a9 | 444 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
445 | } |
446 | } | |
790fe579 | 447 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 448 | return false; |
1da177e4 | 449 | |
f96637be | 450 | cifs_dbg(FYI, "oplock type 0x%d level 0x%d\n", |
b6b38f70 | 451 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 452 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 453 | return false; |
1da177e4 LT |
454 | |
455 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 456 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 457 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 458 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 459 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 460 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
461 | if (tcon->tid != buf->Tid) |
462 | continue; | |
463 | ||
44c58186 | 464 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
4477288a | 465 | spin_lock(&cifs_file_list_lock); |
f1987b44 JL |
466 | list_for_each(tmp2, &tcon->openFileList) { |
467 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 468 | tlist); |
4b4de76e | 469 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
470 | continue; |
471 | ||
f96637be | 472 | cifs_dbg(FYI, "file id match, oplock break\n"); |
a5e18bc3 | 473 | pCifsInode = CIFS_I(netfile->dentry->d_inode); |
9b646972 | 474 | |
c6723628 | 475 | cifs_set_oplock_level(pCifsInode, |
12fed00d | 476 | pSMB->OplockLevel ? OPLOCK_READ : 0); |
da472fc8 | 477 | queue_work(cifsiod_wq, |
ad635942 | 478 | &netfile->oplock_break); |
9b646972 TH |
479 | netfile->oplock_break_cancelled = false; |
480 | ||
4477288a | 481 | spin_unlock(&cifs_file_list_lock); |
3f9bcca7 | 482 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 483 | return true; |
1da177e4 | 484 | } |
4477288a | 485 | spin_unlock(&cifs_file_list_lock); |
3f9bcca7 | 486 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 487 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 488 | return true; |
1da177e4 LT |
489 | } |
490 | } | |
3f9bcca7 | 491 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 492 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 493 | return true; |
1da177e4 LT |
494 | } |
495 | ||
496 | void | |
792af7b0 | 497 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 LT |
498 | { |
499 | int i, j; | |
500 | char debug_line[17]; | |
792af7b0 | 501 | unsigned char *buffer = buf; |
1da177e4 LT |
502 | |
503 | if (traceSMB == 0) | |
504 | return; | |
505 | ||
1da177e4 | 506 | for (i = 0, j = 0; i < smb_buf_length; i++, j++) { |
ad7a2926 SF |
507 | if (i % 8 == 0) { |
508 | /* have reached the beginning of line */ | |
1da177e4 LT |
509 | printk(KERN_DEBUG "| "); |
510 | j = 0; | |
511 | } | |
512 | printk("%0#4x ", buffer[i]); | |
513 | debug_line[2 * j] = ' '; | |
514 | if (isprint(buffer[i])) | |
515 | debug_line[1 + (2 * j)] = buffer[i]; | |
516 | else | |
517 | debug_line[1 + (2 * j)] = '_'; | |
518 | ||
ad7a2926 SF |
519 | if (i % 8 == 7) { |
520 | /* reached end of line, time to print ascii */ | |
1da177e4 LT |
521 | debug_line[16] = 0; |
522 | printk(" | %s\n", debug_line); | |
523 | } | |
524 | } | |
525 | for (; j < 8; j++) { | |
526 | printk(" "); | |
527 | debug_line[2 * j] = ' '; | |
528 | debug_line[1 + (2 * j)] = ' '; | |
529 | } | |
ad7a2926 | 530 | printk(" | %s\n", debug_line); |
1da177e4 LT |
531 | return; |
532 | } | |
6a0b4824 | 533 | |
ec06aedd JL |
534 | void |
535 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
536 | { | |
537 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 538 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
f96637be JP |
539 | 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", |
540 | cifs_sb_master_tcon(cifs_sb)->treeName); | |
ec06aedd JL |
541 | } |
542 | } | |
e66673e3 | 543 | |
c6723628 | 544 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 545 | { |
c6723628 | 546 | oplock &= 0xF; |
e66673e3 | 547 | |
c6723628 | 548 | if (oplock == OPLOCK_EXCLUSIVE) { |
e66673e3 PS |
549 | cinode->clientCanCacheAll = true; |
550 | cinode->clientCanCacheRead = true; | |
f96637be JP |
551 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
552 | &cinode->vfs_inode); | |
c6723628 | 553 | } else if (oplock == OPLOCK_READ) { |
e66673e3 PS |
554 | cinode->clientCanCacheAll = false; |
555 | cinode->clientCanCacheRead = true; | |
f96637be JP |
556 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
557 | &cinode->vfs_inode); | |
e66673e3 PS |
558 | } else { |
559 | cinode->clientCanCacheAll = false; | |
560 | cinode->clientCanCacheRead = false; | |
561 | } | |
562 | } | |
3d3ea8e6 SP |
563 | |
564 | bool | |
565 | backup_cred(struct cifs_sb_info *cifs_sb) | |
566 | { | |
567 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 568 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
569 | return true; |
570 | } | |
571 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
572 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
573 | return true; | |
574 | } | |
575 | ||
576 | return false; | |
577 | } | |
233839b1 PS |
578 | |
579 | void | |
580 | cifs_del_pending_open(struct cifs_pending_open *open) | |
581 | { | |
582 | spin_lock(&cifs_file_list_lock); | |
583 | list_del(&open->olist); | |
584 | spin_unlock(&cifs_file_list_lock); | |
585 | } | |
586 | ||
587 | void | |
588 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
589 | struct cifs_pending_open *open) | |
590 | { | |
591 | #ifdef CONFIG_CIFS_SMB2 | |
592 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); | |
593 | #endif | |
594 | open->oplock = CIFS_OPLOCK_NO_CHANGE; | |
595 | open->tlink = tlink; | |
596 | fid->pending_open = open; | |
597 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
598 | } | |
599 | ||
600 | void | |
601 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
602 | struct cifs_pending_open *open) | |
603 | { | |
604 | spin_lock(&cifs_file_list_lock); | |
605 | cifs_add_pending_open_locked(fid, tlink, open); | |
606 | spin_unlock(&cifs_file_list_lock); | |
607 | } |