Commit | Line | Data |
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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" |
1da177e4 LT |
32 | |
33 | extern mempool_t *cifs_sm_req_poolp; | |
34 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 35 | |
fb8c4b14 SF |
36 | /* The xid serves as a useful identifier for each incoming vfs request, |
37 | in a similar way to the mid which is useful to track each sent smb, | |
38 | and CurrentXid can also provide a running counter (although it | |
39 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
40 | since the cifs fs was mounted */ |
41 | ||
42 | unsigned int | |
43 | _GetXid(void) | |
44 | { | |
45 | unsigned int xid; | |
46 | ||
47 | spin_lock(&GlobalMid_Lock); | |
48 | GlobalTotalActiveXid++; | |
50c2f753 SF |
49 | |
50 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 51 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 52 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 53 | if (GlobalTotalActiveXid > 65000) |
b6b38f70 | 54 | cFYI(1, "warning: more than 65000 requests active"); |
1da177e4 LT |
55 | xid = GlobalCurrentXid++; |
56 | spin_unlock(&GlobalMid_Lock); | |
57 | return xid; | |
58 | } | |
59 | ||
60 | void | |
61 | _FreeXid(unsigned int xid) | |
62 | { | |
63 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 64 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
65 | BUG(); */ |
66 | GlobalTotalActiveXid--; | |
67 | spin_unlock(&GlobalMid_Lock); | |
68 | } | |
69 | ||
96daf2b0 | 70 | struct cifs_ses * |
1da177e4 LT |
71 | sesInfoAlloc(void) |
72 | { | |
96daf2b0 | 73 | struct cifs_ses *ret_buf; |
1da177e4 | 74 | |
96daf2b0 | 75 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 76 | if (ret_buf) { |
1da177e4 LT |
77 | atomic_inc(&sesInfoAllocCount); |
78 | ret_buf->status = CifsNew; | |
14fbf50d JL |
79 | ++ret_buf->ses_count; |
80 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 81 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 82 | mutex_init(&ret_buf->session_mutex); |
1da177e4 LT |
83 | } |
84 | return ret_buf; | |
85 | } | |
86 | ||
87 | void | |
96daf2b0 | 88 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
89 | { |
90 | if (buf_to_free == NULL) { | |
b6b38f70 | 91 | cFYI(1, "Null buffer passed to sesInfoFree"); |
1da177e4 LT |
92 | return; |
93 | } | |
94 | ||
1da177e4 | 95 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
96 | kfree(buf_to_free->serverOS); |
97 | kfree(buf_to_free->serverDomain); | |
98 | kfree(buf_to_free->serverNOS); | |
55162dec JL |
99 | if (buf_to_free->password) { |
100 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
101 | kfree(buf_to_free->password); | |
102 | } | |
8727c8a8 | 103 | kfree(buf_to_free->user_name); |
3979877e | 104 | kfree(buf_to_free->domainName); |
1da177e4 LT |
105 | kfree(buf_to_free); |
106 | } | |
107 | ||
96daf2b0 | 108 | struct cifs_tcon * |
1da177e4 LT |
109 | tconInfoAlloc(void) |
110 | { | |
96daf2b0 SF |
111 | struct cifs_tcon *ret_buf; |
112 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 113 | if (ret_buf) { |
1da177e4 | 114 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 115 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 116 | ++ret_buf->tc_count; |
1da177e4 | 117 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 118 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
1da177e4 LT |
119 | #ifdef CONFIG_CIFS_STATS |
120 | spin_lock_init(&ret_buf->stat_lock); | |
121 | #endif | |
1da177e4 LT |
122 | } |
123 | return ret_buf; | |
124 | } | |
125 | ||
126 | void | |
96daf2b0 | 127 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
128 | { |
129 | if (buf_to_free == NULL) { | |
b6b38f70 | 130 | cFYI(1, "Null buffer passed to tconInfoFree"); |
1da177e4 LT |
131 | return; |
132 | } | |
1da177e4 | 133 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 134 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
135 | if (buf_to_free->password) { |
136 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
137 | kfree(buf_to_free->password); | |
138 | } | |
1da177e4 LT |
139 | kfree(buf_to_free); |
140 | } | |
141 | ||
142 | struct smb_hdr * | |
143 | cifs_buf_get(void) | |
144 | { | |
145 | struct smb_hdr *ret_buf = NULL; | |
146 | ||
fb8c4b14 SF |
147 | /* We could use negotiated size instead of max_msgsize - |
148 | but it may be more efficient to always alloc same size | |
149 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 150 | defaults to this and can not be bigger */ |
232087cb | 151 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
152 | |
153 | /* clear the first few header bytes */ | |
154 | /* for most paths, more is cleared in header_assemble */ | |
155 | if (ret_buf) { | |
156 | memset(ret_buf, 0, sizeof(struct smb_hdr) + 3); | |
157 | atomic_inc(&bufAllocCount); | |
4498eed5 SF |
158 | #ifdef CONFIG_CIFS_STATS2 |
159 | atomic_inc(&totBufAllocCount); | |
160 | #endif /* CONFIG_CIFS_STATS2 */ | |
1da177e4 LT |
161 | } |
162 | ||
163 | return ret_buf; | |
164 | } | |
165 | ||
166 | void | |
167 | cifs_buf_release(void *buf_to_free) | |
168 | { | |
1da177e4 | 169 | if (buf_to_free == NULL) { |
b6b38f70 | 170 | /* cFYI(1, "Null buffer passed to cifs_buf_release");*/ |
1da177e4 LT |
171 | return; |
172 | } | |
fb8c4b14 | 173 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
174 | |
175 | atomic_dec(&bufAllocCount); | |
176 | return; | |
177 | } | |
178 | ||
179 | struct smb_hdr * | |
180 | cifs_small_buf_get(void) | |
181 | { | |
182 | struct smb_hdr *ret_buf = NULL; | |
183 | ||
fb8c4b14 SF |
184 | /* We could use negotiated size instead of max_msgsize - |
185 | but it may be more efficient to always alloc same size | |
186 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 187 | defaults to this and can not be bigger */ |
232087cb | 188 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
189 | if (ret_buf) { |
190 | /* No need to clear memory here, cleared in header assemble */ | |
191 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
192 | atomic_inc(&smBufAllocCount); | |
4498eed5 SF |
193 | #ifdef CONFIG_CIFS_STATS2 |
194 | atomic_inc(&totSmBufAllocCount); | |
195 | #endif /* CONFIG_CIFS_STATS2 */ | |
196 | ||
1da177e4 LT |
197 | } |
198 | return ret_buf; | |
199 | } | |
200 | ||
201 | void | |
202 | cifs_small_buf_release(void *buf_to_free) | |
203 | { | |
204 | ||
205 | if (buf_to_free == NULL) { | |
b6b38f70 | 206 | cFYI(1, "Null buffer passed to cifs_small_buf_release"); |
1da177e4 LT |
207 | return; |
208 | } | |
fb8c4b14 | 209 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
210 | |
211 | atomic_dec(&smBufAllocCount); | |
212 | return; | |
213 | } | |
214 | ||
1982c344 SF |
215 | /* NB: MID can not be set if treeCon not passed in, in that |
216 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
217 | void |
218 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 219 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
220 | /* length of fixed section (word count) in two byte units */) |
221 | { | |
1da177e4 LT |
222 | char *temp = (char *) buffer; |
223 | ||
fb8c4b14 | 224 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 225 | |
be8e3b00 | 226 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 227 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 228 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 229 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
230 | |
231 | buffer->Protocol[0] = 0xFF; | |
232 | buffer->Protocol[1] = 'S'; | |
233 | buffer->Protocol[2] = 'M'; | |
234 | buffer->Protocol[3] = 'B'; | |
235 | buffer->Command = smb_command; | |
236 | buffer->Flags = 0x00; /* case sensitive */ | |
237 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
238 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
239 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
240 | if (treeCon) { |
241 | buffer->Tid = treeCon->tid; | |
242 | if (treeCon->ses) { | |
243 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
244 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 245 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 246 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 247 | |
1982c344 SF |
248 | /* Uid is not converted */ |
249 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 250 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
251 | } |
252 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
253 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
254 | if (treeCon->nocase) |
255 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 256 | if ((treeCon->ses) && (treeCon->ses->server)) |
96daf2b0 | 257 | if (treeCon->ses->server->sec_mode & |
1da177e4 LT |
258 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
259 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
260 | } | |
261 | ||
262 | /* endian conversion of flags is now done just before sending */ | |
263 | buffer->WordCount = (char) word_count; | |
264 | return; | |
265 | } | |
266 | ||
2cd646a2 | 267 | static int |
68abaffa | 268 | check_smb_hdr(struct smb_hdr *smb, __u16 mid) |
1da177e4 | 269 | { |
68abaffa JL |
270 | /* does it have the right SMB "signature" ? */ |
271 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
272 | cERROR(1, "Bad protocol string signature header 0x%x", | |
273 | *(unsigned int *)smb->Protocol); | |
274 | return 1; | |
275 | } | |
276 | ||
277 | /* Make sure that message ids match */ | |
278 | if (mid != smb->Mid) { | |
279 | cERROR(1, "Mids do not match. received=%u expected=%u", | |
280 | smb->Mid, mid); | |
281 | return 1; | |
1da177e4 | 282 | } |
68abaffa JL |
283 | |
284 | /* if it's a response then accept */ | |
285 | if (smb->Flags & SMBFLG_RESPONSE) | |
286 | return 0; | |
287 | ||
288 | /* only one valid case where server sends us request */ | |
289 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
290 | return 0; | |
291 | ||
292 | cERROR(1, "Server sent request, not response. mid=%u", smb->Mid); | |
1da177e4 LT |
293 | return 1; |
294 | } | |
295 | ||
296 | int | |
d4e4854f | 297 | checkSMB(char *buf, unsigned int total_read) |
1da177e4 | 298 | { |
d4e4854f PS |
299 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
300 | __u16 mid = smb->Mid; | |
376b43f4 | 301 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 302 | __u32 clc_len; /* calculated length */ |
376b43f4 JL |
303 | cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", |
304 | total_read, rfclen); | |
d103e164 | 305 | |
376b43f4 JL |
306 | /* is this frame too small to even get to a BCC? */ |
307 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
308 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 309 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 310 | /* it's an error return */ |
d103e164 SF |
311 | smb->WordCount = 0; |
312 | /* some error cases do not return wct and bcc */ | |
313 | return 0; | |
376b43f4 | 314 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 315 | (smb->WordCount == 0)) { |
fb8c4b14 | 316 | char *tmp = (char *)smb; |
d103e164 SF |
317 | /* Need to work around a bug in two servers here */ |
318 | /* First, check if the part of bcc they sent was zero */ | |
319 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
320 | /* some servers return only half of bcc | |
321 | * on simple responses (wct, bcc both zero) | |
322 | * in particular have seen this on | |
323 | * ulogoffX and FindClose. This leaves | |
324 | * one byte of bcc potentially unitialized | |
325 | */ | |
326 | /* zero rest of bcc */ | |
327 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 328 | return 0; |
1da177e4 | 329 | } |
b6b38f70 | 330 | cERROR(1, "rcvd invalid byte count (bcc)"); |
d103e164 | 331 | } else { |
b6b38f70 | 332 | cERROR(1, "Length less than smb header size"); |
1da177e4 | 333 | } |
376b43f4 | 334 | return -EIO; |
1da177e4 LT |
335 | } |
336 | ||
376b43f4 | 337 | /* otherwise, there is enough to get to the BCC */ |
68abaffa | 338 | if (check_smb_hdr(smb, mid)) |
376b43f4 | 339 | return -EIO; |
820a803f | 340 | clc_len = smbCalcSize(smb); |
184ed211 | 341 | |
376b43f4 | 342 | if (4 + rfclen != total_read) { |
b6b38f70 | 343 | cERROR(1, "Length read does not match RFC1001 length %d", |
376b43f4 JL |
344 | rfclen); |
345 | return -EIO; | |
184ed211 SF |
346 | } |
347 | ||
376b43f4 | 348 | if (4 + rfclen != clc_len) { |
184ed211 | 349 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 350 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 351 | /* check if lengths match mod 64K */ |
376b43f4 | 352 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 353 | return 0; /* bcc wrapped */ |
184ed211 | 354 | } |
6284644e | 355 | cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u", |
376b43f4 | 356 | clc_len, 4 + rfclen, smb->Mid); |
6284644e | 357 | |
376b43f4 | 358 | if (4 + rfclen < clc_len) { |
6284644e | 359 | cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u", |
376b43f4 JL |
360 | rfclen, smb->Mid); |
361 | return -EIO; | |
362 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
363 | /* |
364 | * Some servers (Windows XP in particular) send more | |
365 | * data than the lengths in the SMB packet would | |
366 | * indicate on certain calls (byte range locks and | |
367 | * trans2 find first calls in particular). While the | |
368 | * client can handle such a frame by ignoring the | |
369 | * trailing data, we choose limit the amount of extra | |
370 | * data to 512 bytes. | |
371 | */ | |
372 | cERROR(1, "RFC1001 size %u more than 512 bytes larger " | |
376b43f4 JL |
373 | "than SMB for mid=%u", rfclen, smb->Mid); |
374 | return -EIO; | |
46c79a64 | 375 | } |
1da177e4 | 376 | } |
20962438 | 377 | return 0; |
1da177e4 | 378 | } |
4b18f2a9 SF |
379 | |
380 | bool | |
d4e4854f | 381 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 382 | { |
d4e4854f | 383 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 384 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 385 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
386 | struct cifs_ses *ses; |
387 | struct cifs_tcon *tcon; | |
f1987b44 | 388 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
389 | struct cifsFileInfo *netfile; |
390 | ||
b6b38f70 | 391 | cFYI(1, "Checking for oplock break or dnotify response"); |
790fe579 | 392 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 393 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 394 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 395 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 396 | struct file_notify_information *pnotify; |
1da177e4 | 397 | __u32 data_offset = 0; |
820a803f | 398 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
399 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
400 | ||
3979877e SF |
401 | pnotify = (struct file_notify_information *) |
402 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
b6b38f70 JP |
403 | cFYI(1, "dnotify on %s Action: 0x%x", |
404 | pnotify->FileName, pnotify->Action); | |
fb8c4b14 | 405 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 406 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 407 | return true; |
1da177e4 | 408 | } |
790fe579 | 409 | if (pSMBr->hdr.Status.CifsError) { |
b6b38f70 JP |
410 | cFYI(1, "notify err 0x%d", |
411 | pSMBr->hdr.Status.CifsError); | |
4b18f2a9 | 412 | return true; |
1da177e4 | 413 | } |
4b18f2a9 | 414 | return false; |
fb8c4b14 | 415 | } |
790fe579 | 416 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 417 | return false; |
790fe579 | 418 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
419 | /* no sense logging error on invalid handle on oplock |
420 | break - harmless race between close request and oplock | |
421 | break response is expected from time to time writing out | |
422 | large dirty files cached on the client */ | |
fb8c4b14 SF |
423 | if ((NT_STATUS_INVALID_HANDLE) == |
424 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
b6b38f70 | 425 | cFYI(1, "invalid handle on oplock break"); |
4b18f2a9 | 426 | return true; |
fb8c4b14 | 427 | } else if (ERRbadfid == |
1da177e4 | 428 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 429 | return true; |
1da177e4 | 430 | } else { |
4b18f2a9 | 431 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
432 | } |
433 | } | |
790fe579 | 434 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 435 | return false; |
1da177e4 | 436 | |
b6b38f70 JP |
437 | cFYI(1, "oplock type 0x%d level 0x%d", |
438 | pSMB->LockType, pSMB->OplockLevel); | |
790fe579 | 439 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 440 | return false; |
1da177e4 LT |
441 | |
442 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 443 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 444 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 445 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 446 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 447 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
448 | if (tcon->tid != buf->Tid) |
449 | continue; | |
450 | ||
a4544347 | 451 | cifs_stats_inc(&tcon->num_oplock_brks); |
4477288a | 452 | spin_lock(&cifs_file_list_lock); |
f1987b44 JL |
453 | list_for_each(tmp2, &tcon->openFileList) { |
454 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 455 | tlist); |
f1987b44 JL |
456 | if (pSMB->Fid != netfile->netfid) |
457 | continue; | |
458 | ||
b6b38f70 | 459 | cFYI(1, "file id match, oplock break"); |
a5e18bc3 | 460 | pCifsInode = CIFS_I(netfile->dentry->d_inode); |
9b646972 | 461 | |
c6723628 | 462 | cifs_set_oplock_level(pCifsInode, |
12fed00d | 463 | pSMB->OplockLevel ? OPLOCK_READ : 0); |
da472fc8 | 464 | queue_work(cifsiod_wq, |
ad635942 | 465 | &netfile->oplock_break); |
9b646972 TH |
466 | netfile->oplock_break_cancelled = false; |
467 | ||
4477288a | 468 | spin_unlock(&cifs_file_list_lock); |
3f9bcca7 | 469 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 470 | return true; |
1da177e4 | 471 | } |
4477288a | 472 | spin_unlock(&cifs_file_list_lock); |
3f9bcca7 | 473 | spin_unlock(&cifs_tcp_ses_lock); |
b6b38f70 | 474 | cFYI(1, "No matching file for oplock break"); |
4b18f2a9 | 475 | return true; |
1da177e4 LT |
476 | } |
477 | } | |
3f9bcca7 | 478 | spin_unlock(&cifs_tcp_ses_lock); |
b6b38f70 | 479 | cFYI(1, "Can not process oplock break for non-existent connection"); |
4b18f2a9 | 480 | return true; |
1da177e4 LT |
481 | } |
482 | ||
483 | void | |
792af7b0 | 484 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 LT |
485 | { |
486 | int i, j; | |
487 | char debug_line[17]; | |
792af7b0 | 488 | unsigned char *buffer = buf; |
1da177e4 LT |
489 | |
490 | if (traceSMB == 0) | |
491 | return; | |
492 | ||
1da177e4 | 493 | for (i = 0, j = 0; i < smb_buf_length; i++, j++) { |
ad7a2926 SF |
494 | if (i % 8 == 0) { |
495 | /* have reached the beginning of line */ | |
1da177e4 LT |
496 | printk(KERN_DEBUG "| "); |
497 | j = 0; | |
498 | } | |
499 | printk("%0#4x ", buffer[i]); | |
500 | debug_line[2 * j] = ' '; | |
501 | if (isprint(buffer[i])) | |
502 | debug_line[1 + (2 * j)] = buffer[i]; | |
503 | else | |
504 | debug_line[1 + (2 * j)] = '_'; | |
505 | ||
ad7a2926 SF |
506 | if (i % 8 == 7) { |
507 | /* reached end of line, time to print ascii */ | |
1da177e4 LT |
508 | debug_line[16] = 0; |
509 | printk(" | %s\n", debug_line); | |
510 | } | |
511 | } | |
512 | for (; j < 8; j++) { | |
513 | printk(" "); | |
514 | debug_line[2 * j] = ' '; | |
515 | debug_line[1 + (2 * j)] = ' '; | |
516 | } | |
ad7a2926 | 517 | printk(" | %s\n", debug_line); |
1da177e4 LT |
518 | return; |
519 | } | |
6a0b4824 | 520 | |
ec06aedd JL |
521 | void |
522 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
523 | { | |
524 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 525 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
b6b38f70 | 526 | cERROR(1, "Autodisabling the use of server inode numbers on " |
ec06aedd JL |
527 | "%s. This server doesn't seem to support them " |
528 | "properly. Hardlinks will not be recognized on this " | |
529 | "mount. Consider mounting with the \"noserverino\" " | |
530 | "option to silence this message.", | |
0d424ad0 | 531 | cifs_sb_master_tcon(cifs_sb)->treeName); |
ec06aedd JL |
532 | } |
533 | } | |
e66673e3 | 534 | |
c6723628 | 535 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 536 | { |
c6723628 | 537 | oplock &= 0xF; |
e66673e3 | 538 | |
c6723628 | 539 | if (oplock == OPLOCK_EXCLUSIVE) { |
e66673e3 PS |
540 | cinode->clientCanCacheAll = true; |
541 | cinode->clientCanCacheRead = true; | |
c6723628 PS |
542 | cFYI(1, "Exclusive Oplock granted on inode %p", |
543 | &cinode->vfs_inode); | |
544 | } else if (oplock == OPLOCK_READ) { | |
e66673e3 PS |
545 | cinode->clientCanCacheAll = false; |
546 | cinode->clientCanCacheRead = true; | |
c6723628 PS |
547 | cFYI(1, "Level II Oplock granted on inode %p", |
548 | &cinode->vfs_inode); | |
e66673e3 PS |
549 | } else { |
550 | cinode->clientCanCacheAll = false; | |
551 | cinode->clientCanCacheRead = false; | |
552 | } | |
553 | } | |
3d3ea8e6 SP |
554 | |
555 | bool | |
556 | backup_cred(struct cifs_sb_info *cifs_sb) | |
557 | { | |
558 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
559 | if (cifs_sb->mnt_backupuid == current_fsuid()) | |
560 | return true; | |
561 | } | |
562 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
563 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
564 | return true; | |
565 | } | |
566 | ||
567 | return false; | |
568 | } |