Commit | Line | Data |
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929be906 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
1da177e4 LT |
2 | /* |
3 | * fs/cifs/misc.c | |
4 | * | |
ad7a2926 | 5 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
6 | * Author(s): Steve French (sfrench@us.ibm.com) |
7 | * | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/slab.h> | |
11 | #include <linux/ctype.h> | |
12 | #include <linux/mempool.h> | |
ccf7f408 | 13 | #include <linux/vmalloc.h> |
1da177e4 LT |
14 | #include "cifspdu.h" |
15 | #include "cifsglob.h" | |
16 | #include "cifsproto.h" | |
17 | #include "cifs_debug.h" | |
18 | #include "smberr.h" | |
19 | #include "nterr.h" | |
6c91d362 | 20 | #include "cifs_unicode.h" |
3792c173 | 21 | #include "smb2pdu.h" |
bacd704a | 22 | #include "cifsfs.h" |
e4af35fa PA |
23 | #ifdef CONFIG_CIFS_DFS_UPCALL |
24 | #include "dns_resolve.h" | |
25 | #endif | |
8401e936 | 26 | #include "fs_context.h" |
1da177e4 LT |
27 | |
28 | extern mempool_t *cifs_sm_req_poolp; | |
29 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 30 | |
fb8c4b14 SF |
31 | /* The xid serves as a useful identifier for each incoming vfs request, |
32 | in a similar way to the mid which is useful to track each sent smb, | |
33 | and CurrentXid can also provide a running counter (although it | |
34 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
35 | since the cifs fs was mounted */ |
36 | ||
37 | unsigned int | |
6d5786a3 | 38 | _get_xid(void) |
1da177e4 LT |
39 | { |
40 | unsigned int xid; | |
41 | ||
42 | spin_lock(&GlobalMid_Lock); | |
43 | GlobalTotalActiveXid++; | |
50c2f753 SF |
44 | |
45 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 46 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 47 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 48 | if (GlobalTotalActiveXid > 65000) |
f96637be | 49 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
50 | xid = GlobalCurrentXid++; |
51 | spin_unlock(&GlobalMid_Lock); | |
52 | return xid; | |
53 | } | |
54 | ||
55 | void | |
6d5786a3 | 56 | _free_xid(unsigned int xid) |
1da177e4 LT |
57 | { |
58 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 59 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
60 | BUG(); */ |
61 | GlobalTotalActiveXid--; | |
62 | spin_unlock(&GlobalMid_Lock); | |
63 | } | |
64 | ||
96daf2b0 | 65 | struct cifs_ses * |
1da177e4 LT |
66 | sesInfoAlloc(void) |
67 | { | |
96daf2b0 | 68 | struct cifs_ses *ret_buf; |
1da177e4 | 69 | |
96daf2b0 | 70 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 71 | if (ret_buf) { |
1da177e4 LT |
72 | atomic_inc(&sesInfoAllocCount); |
73 | ret_buf->status = CifsNew; | |
14fbf50d JL |
74 | ++ret_buf->ses_count; |
75 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 76 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 77 | mutex_init(&ret_buf->session_mutex); |
b6f0dd5d | 78 | spin_lock_init(&ret_buf->iface_lock); |
1da177e4 LT |
79 | } |
80 | return ret_buf; | |
81 | } | |
82 | ||
83 | void | |
96daf2b0 | 84 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
85 | { |
86 | if (buf_to_free == NULL) { | |
f96637be | 87 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
88 | return; |
89 | } | |
90 | ||
1da177e4 | 91 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
92 | kfree(buf_to_free->serverOS); |
93 | kfree(buf_to_free->serverDomain); | |
94 | kfree(buf_to_free->serverNOS); | |
453431a5 | 95 | kfree_sensitive(buf_to_free->password); |
8727c8a8 | 96 | kfree(buf_to_free->user_name); |
3979877e | 97 | kfree(buf_to_free->domainName); |
453431a5 | 98 | kfree_sensitive(buf_to_free->auth_key.response); |
b6f0dd5d | 99 | kfree(buf_to_free->iface_list); |
453431a5 | 100 | kfree_sensitive(buf_to_free); |
1da177e4 LT |
101 | } |
102 | ||
96daf2b0 | 103 | struct cifs_tcon * |
1da177e4 LT |
104 | tconInfoAlloc(void) |
105 | { | |
96daf2b0 | 106 | struct cifs_tcon *ret_buf; |
0544b324 JP |
107 | |
108 | ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL); | |
109 | if (!ret_buf) | |
110 | return NULL; | |
111 | ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL); | |
112 | if (!ret_buf->crfid.fid) { | |
113 | kfree(ret_buf); | |
114 | return NULL; | |
1da177e4 | 115 | } |
0544b324 JP |
116 | |
117 | atomic_inc(&tconInfoAllocCount); | |
118 | ret_buf->tidStatus = CifsNew; | |
119 | ++ret_buf->tc_count; | |
120 | INIT_LIST_HEAD(&ret_buf->openFileList); | |
121 | INIT_LIST_HEAD(&ret_buf->tcon_list); | |
122 | spin_lock_init(&ret_buf->open_file_lock); | |
123 | mutex_init(&ret_buf->crfid.fid_mutex); | |
124 | spin_lock_init(&ret_buf->stat_lock); | |
125 | atomic_set(&ret_buf->num_local_opens, 0); | |
126 | atomic_set(&ret_buf->num_remote_opens, 0); | |
127 | ||
1da177e4 LT |
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); |
453431a5 | 140 | kfree_sensitive(buf_to_free->password); |
a93864d9 | 141 | kfree(buf_to_free->crfid.fid); |
4a367dc0 PA |
142 | #ifdef CONFIG_CIFS_DFS_UPCALL |
143 | kfree(buf_to_free->dfs_path); | |
144 | #endif | |
1da177e4 LT |
145 | kfree(buf_to_free); |
146 | } | |
147 | ||
148 | struct smb_hdr * | |
149 | cifs_buf_get(void) | |
150 | { | |
151 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
152 | /* |
153 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
154 | * more bytes for CIFS. | |
155 | */ | |
49f466bd | 156 | size_t buf_size = sizeof(struct smb2_sync_hdr); |
2a38e120 | 157 | |
3792c173 PS |
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 */ | |
a6f74e80 N |
168 | memset(ret_buf, 0, buf_size + 3); |
169 | atomic_inc(&bufAllocCount); | |
4498eed5 | 170 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 171 | atomic_inc(&totBufAllocCount); |
4498eed5 | 172 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
173 | |
174 | return ret_buf; | |
175 | } | |
176 | ||
177 | void | |
178 | cifs_buf_release(void *buf_to_free) | |
179 | { | |
1da177e4 | 180 | if (buf_to_free == NULL) { |
f96637be | 181 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
182 | return; |
183 | } | |
fb8c4b14 | 184 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
185 | |
186 | atomic_dec(&bufAllocCount); | |
187 | return; | |
188 | } | |
189 | ||
190 | struct smb_hdr * | |
191 | cifs_small_buf_get(void) | |
192 | { | |
193 | struct smb_hdr *ret_buf = NULL; | |
194 | ||
fb8c4b14 SF |
195 | /* We could use negotiated size instead of max_msgsize - |
196 | but it may be more efficient to always alloc same size | |
197 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 198 | defaults to this and can not be bigger */ |
232087cb | 199 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
200 | /* No need to clear memory here, cleared in header assemble */ |
201 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 202 | atomic_inc(&smBufAllocCount); |
4498eed5 | 203 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 204 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
205 | #endif /* CONFIG_CIFS_STATS2 */ |
206 | ||
1da177e4 LT |
207 | return ret_buf; |
208 | } | |
209 | ||
210 | void | |
211 | cifs_small_buf_release(void *buf_to_free) | |
212 | { | |
213 | ||
214 | if (buf_to_free == NULL) { | |
f96637be | 215 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
216 | return; |
217 | } | |
fb8c4b14 | 218 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
219 | |
220 | atomic_dec(&smBufAllocCount); | |
221 | return; | |
222 | } | |
223 | ||
6d81ed1e SP |
224 | void |
225 | free_rsp_buf(int resp_buftype, void *rsp) | |
226 | { | |
227 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
228 | cifs_small_buf_release(rsp); | |
229 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
230 | cifs_buf_release(rsp); | |
231 | } | |
232 | ||
1982c344 SF |
233 | /* NB: MID can not be set if treeCon not passed in, in that |
234 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
235 | void |
236 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 237 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
238 | /* length of fixed section (word count) in two byte units */) |
239 | { | |
1da177e4 LT |
240 | char *temp = (char *) buffer; |
241 | ||
fb8c4b14 | 242 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 243 | |
be8e3b00 | 244 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 245 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 246 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 247 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
248 | |
249 | buffer->Protocol[0] = 0xFF; | |
250 | buffer->Protocol[1] = 'S'; | |
251 | buffer->Protocol[2] = 'M'; | |
252 | buffer->Protocol[3] = 'B'; | |
253 | buffer->Command = smb_command; | |
254 | buffer->Flags = 0x00; /* case sensitive */ | |
255 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
256 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
257 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
258 | if (treeCon) { |
259 | buffer->Tid = treeCon->tid; | |
260 | if (treeCon->ses) { | |
261 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
262 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 263 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 264 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 265 | |
1982c344 SF |
266 | /* Uid is not converted */ |
267 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 268 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
269 | } |
270 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
271 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
272 | if (treeCon->nocase) |
273 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 274 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 275 | if (treeCon->ses->server->sign) |
1da177e4 LT |
276 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
277 | } | |
278 | ||
279 | /* endian conversion of flags is now done just before sending */ | |
280 | buffer->WordCount = (char) word_count; | |
281 | return; | |
282 | } | |
283 | ||
2cd646a2 | 284 | static int |
944d6f1a | 285 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 286 | { |
68abaffa JL |
287 | /* does it have the right SMB "signature" ? */ |
288 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
289 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
290 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
291 | return 1; |
292 | } | |
293 | ||
68abaffa JL |
294 | /* if it's a response then accept */ |
295 | if (smb->Flags & SMBFLG_RESPONSE) | |
296 | return 0; | |
297 | ||
298 | /* only one valid case where server sends us request */ | |
299 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
300 | return 0; | |
301 | ||
3d378d3f TG |
302 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
303 | get_mid(smb)); | |
1da177e4 LT |
304 | return 1; |
305 | } | |
306 | ||
307 | int | |
373512ec | 308 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 309 | { |
d4e4854f | 310 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 311 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 312 | __u32 clc_len; /* calculated length */ |
f96637be JP |
313 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
314 | total_read, rfclen); | |
d103e164 | 315 | |
376b43f4 JL |
316 | /* is this frame too small to even get to a BCC? */ |
317 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
318 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 319 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 320 | /* it's an error return */ |
d103e164 SF |
321 | smb->WordCount = 0; |
322 | /* some error cases do not return wct and bcc */ | |
323 | return 0; | |
376b43f4 | 324 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 325 | (smb->WordCount == 0)) { |
fb8c4b14 | 326 | char *tmp = (char *)smb; |
d103e164 SF |
327 | /* Need to work around a bug in two servers here */ |
328 | /* First, check if the part of bcc they sent was zero */ | |
329 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
330 | /* some servers return only half of bcc | |
331 | * on simple responses (wct, bcc both zero) | |
332 | * in particular have seen this on | |
333 | * ulogoffX and FindClose. This leaves | |
334 | * one byte of bcc potentially unitialized | |
335 | */ | |
336 | /* zero rest of bcc */ | |
337 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 338 | return 0; |
1da177e4 | 339 | } |
f96637be | 340 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 341 | } else { |
f96637be | 342 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 343 | } |
376b43f4 | 344 | return -EIO; |
1da177e4 LT |
345 | } |
346 | ||
376b43f4 | 347 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 348 | if (check_smb_hdr(smb)) |
376b43f4 | 349 | return -EIO; |
9ec672bd | 350 | clc_len = smbCalcSize(smb, server); |
184ed211 | 351 | |
376b43f4 | 352 | if (4 + rfclen != total_read) { |
f96637be JP |
353 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
354 | rfclen); | |
376b43f4 | 355 | return -EIO; |
184ed211 SF |
356 | } |
357 | ||
376b43f4 | 358 | if (4 + rfclen != clc_len) { |
3d378d3f | 359 | __u16 mid = get_mid(smb); |
184ed211 | 360 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 361 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 362 | /* check if lengths match mod 64K */ |
376b43f4 | 363 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 364 | return 0; /* bcc wrapped */ |
184ed211 | 365 | } |
f96637be | 366 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 367 | clc_len, 4 + rfclen, mid); |
6284644e | 368 | |
376b43f4 | 369 | if (4 + rfclen < clc_len) { |
f96637be | 370 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 371 | rfclen, mid); |
376b43f4 JL |
372 | return -EIO; |
373 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
374 | /* |
375 | * Some servers (Windows XP in particular) send more | |
376 | * data than the lengths in the SMB packet would | |
377 | * indicate on certain calls (byte range locks and | |
378 | * trans2 find first calls in particular). While the | |
379 | * client can handle such a frame by ignoring the | |
380 | * trailing data, we choose limit the amount of extra | |
381 | * data to 512 bytes. | |
382 | */ | |
f96637be | 383 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 384 | rfclen, mid); |
376b43f4 | 385 | return -EIO; |
46c79a64 | 386 | } |
1da177e4 | 387 | } |
20962438 | 388 | return 0; |
1da177e4 | 389 | } |
4b18f2a9 SF |
390 | |
391 | bool | |
d4e4854f | 392 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 393 | { |
d4e4854f | 394 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 395 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 396 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
397 | struct cifs_ses *ses; |
398 | struct cifs_tcon *tcon; | |
f1987b44 | 399 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
400 | struct cifsFileInfo *netfile; |
401 | ||
f96637be | 402 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 403 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 404 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 405 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 406 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 407 | struct file_notify_information *pnotify; |
1da177e4 | 408 | __u32 data_offset = 0; |
097f5863 DC |
409 | size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length); |
410 | ||
820a803f | 411 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
412 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
413 | ||
097f5863 DC |
414 | if (data_offset > |
415 | len - sizeof(struct file_notify_information)) { | |
a0a3036b | 416 | cifs_dbg(FYI, "Invalid data_offset %u\n", |
097f5863 DC |
417 | data_offset); |
418 | return true; | |
419 | } | |
3979877e SF |
420 | pnotify = (struct file_notify_information *) |
421 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 422 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 423 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 424 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 425 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 426 | return true; |
1da177e4 | 427 | } |
790fe579 | 428 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 429 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 430 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 431 | return true; |
1da177e4 | 432 | } |
4b18f2a9 | 433 | return false; |
fb8c4b14 | 434 | } |
790fe579 | 435 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 436 | return false; |
790fe579 | 437 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
438 | /* no sense logging error on invalid handle on oplock |
439 | break - harmless race between close request and oplock | |
440 | break response is expected from time to time writing out | |
441 | large dirty files cached on the client */ | |
fb8c4b14 SF |
442 | if ((NT_STATUS_INVALID_HANDLE) == |
443 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
a0a3036b | 444 | cifs_dbg(FYI, "Invalid handle on oplock break\n"); |
4b18f2a9 | 445 | return true; |
fb8c4b14 | 446 | } else if (ERRbadfid == |
1da177e4 | 447 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 448 | return true; |
1da177e4 | 449 | } else { |
4b18f2a9 | 450 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
451 | } |
452 | } | |
790fe579 | 453 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 454 | return false; |
1da177e4 | 455 | |
59b04c5d | 456 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 457 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 458 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 459 | return false; |
1da177e4 LT |
460 | |
461 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 462 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 463 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 464 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 465 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 466 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
467 | if (tcon->tid != buf->Tid) |
468 | continue; | |
469 | ||
44c58186 | 470 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 471 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
472 | list_for_each(tmp2, &tcon->openFileList) { |
473 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 474 | tlist); |
4b4de76e | 475 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
476 | continue; |
477 | ||
f96637be | 478 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 479 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 480 | |
c11f1df5 SP |
481 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
482 | &pCifsInode->flags); | |
483 | ||
9bd45408 PS |
484 | netfile->oplock_epoch = 0; |
485 | netfile->oplock_level = pSMB->OplockLevel; | |
9b646972 | 486 | netfile->oplock_break_cancelled = false; |
9bd45408 | 487 | cifs_queue_oplock_break(netfile); |
9b646972 | 488 | |
3afca265 | 489 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 490 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 491 | return true; |
1da177e4 | 492 | } |
3afca265 | 493 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 494 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 495 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 496 | return true; |
1da177e4 LT |
497 | } |
498 | } | |
3f9bcca7 | 499 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 500 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 501 | return true; |
1da177e4 LT |
502 | } |
503 | ||
504 | void | |
792af7b0 | 505 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 506 | { |
1da177e4 LT |
507 | if (traceSMB == 0) |
508 | return; | |
509 | ||
55d83e0d AS |
510 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
511 | smb_buf_length, true); | |
1da177e4 | 512 | } |
6a0b4824 | 513 | |
ec06aedd JL |
514 | void |
515 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
516 | { | |
517 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
5fc7fcd0 AA |
518 | struct cifs_tcon *tcon = NULL; |
519 | ||
520 | if (cifs_sb->master_tlink) | |
521 | tcon = cifs_sb_master_tcon(cifs_sb); | |
522 | ||
f534dc99 | 523 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
29fbeb7a | 524 | cifs_sb->mnt_cifs_serverino_autodisabled = true; |
a0a3036b | 525 | cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n", |
5fc7fcd0 | 526 | tcon ? tcon->treeName : "new server"); |
a0a3036b | 527 | cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n"); |
5fc7fcd0 AA |
528 | cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n"); |
529 | ||
ec06aedd JL |
530 | } |
531 | } | |
e66673e3 | 532 | |
c6723628 | 533 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 534 | { |
c6723628 | 535 | oplock &= 0xF; |
e66673e3 | 536 | |
c6723628 | 537 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 538 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
539 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
540 | &cinode->vfs_inode); | |
c6723628 | 541 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 542 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
543 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
544 | &cinode->vfs_inode); | |
18cceb6a PS |
545 | } else |
546 | cinode->oplock = 0; | |
e66673e3 | 547 | } |
3d3ea8e6 | 548 | |
c11f1df5 SP |
549 | /* |
550 | * We wait for oplock breaks to be processed before we attempt to perform | |
551 | * writes. | |
552 | */ | |
553 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
554 | { | |
555 | int rc; | |
556 | ||
557 | start: | |
558 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 559 | TASK_KILLABLE); |
c11f1df5 SP |
560 | if (rc) |
561 | return rc; | |
562 | ||
563 | spin_lock(&cinode->writers_lock); | |
564 | if (!cinode->writers) | |
565 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
566 | cinode->writers++; | |
567 | /* Check to see if we have started servicing an oplock break */ | |
568 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
569 | cinode->writers--; | |
570 | if (cinode->writers == 0) { | |
571 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
572 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
573 | } | |
574 | spin_unlock(&cinode->writers_lock); | |
575 | goto start; | |
576 | } | |
577 | spin_unlock(&cinode->writers_lock); | |
578 | return 0; | |
579 | } | |
580 | ||
581 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
582 | { | |
583 | spin_lock(&cinode->writers_lock); | |
584 | cinode->writers--; | |
585 | if (cinode->writers == 0) { | |
586 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
587 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
588 | } | |
589 | spin_unlock(&cinode->writers_lock); | |
590 | } | |
591 | ||
b98749ca AA |
592 | /** |
593 | * cifs_queue_oplock_break - queue the oplock break handler for cfile | |
594 | * | |
595 | * This function is called from the demultiplex thread when it | |
596 | * receives an oplock break for @cfile. | |
597 | * | |
598 | * Assumes the tcon->open_file_lock is held. | |
599 | * Assumes cfile->file_info_lock is NOT held. | |
600 | */ | |
601 | void cifs_queue_oplock_break(struct cifsFileInfo *cfile) | |
602 | { | |
603 | /* | |
604 | * Bump the handle refcount now while we hold the | |
605 | * open_file_lock to enforce the validity of it for the oplock | |
606 | * break handler. The matching put is done at the end of the | |
607 | * handler. | |
608 | */ | |
609 | cifsFileInfo_get(cfile); | |
610 | ||
611 | queue_work(cifsoplockd_wq, &cfile->oplock_break); | |
612 | } | |
613 | ||
c11f1df5 SP |
614 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) |
615 | { | |
616 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
617 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
618 | } | |
619 | ||
3d3ea8e6 SP |
620 | bool |
621 | backup_cred(struct cifs_sb_info *cifs_sb) | |
622 | { | |
623 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
8401e936 | 624 | if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid())) |
3d3ea8e6 SP |
625 | return true; |
626 | } | |
627 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
8401e936 | 628 | if (in_group_p(cifs_sb->ctx->backupgid)) |
3d3ea8e6 SP |
629 | return true; |
630 | } | |
631 | ||
632 | return false; | |
633 | } | |
233839b1 PS |
634 | |
635 | void | |
636 | cifs_del_pending_open(struct cifs_pending_open *open) | |
637 | { | |
3afca265 | 638 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 639 | list_del(&open->olist); |
3afca265 | 640 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
641 | } |
642 | ||
643 | void | |
644 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
645 | struct cifs_pending_open *open) | |
646 | { | |
233839b1 | 647 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
648 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
649 | open->tlink = tlink; | |
650 | fid->pending_open = open; | |
651 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
652 | } | |
653 | ||
654 | void | |
655 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
656 | struct cifs_pending_open *open) | |
657 | { | |
3afca265 | 658 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 659 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 660 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 661 | } |
4ecce920 | 662 | |
860b69a9 RS |
663 | /* |
664 | * Critical section which runs after acquiring deferred_lock. | |
9687c85d RS |
665 | * As there is no reference count on cifs_deferred_close, pdclose |
666 | * should not be used outside deferred_lock. | |
860b69a9 | 667 | */ |
c3f207ab RS |
668 | bool |
669 | cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose) | |
670 | { | |
671 | struct cifs_deferred_close *dclose; | |
672 | ||
673 | list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) { | |
674 | if ((dclose->netfid == cfile->fid.netfid) && | |
675 | (dclose->persistent_fid == cfile->fid.persistent_fid) && | |
676 | (dclose->volatile_fid == cfile->fid.volatile_fid)) { | |
677 | *pdclose = dclose; | |
678 | return true; | |
679 | } | |
680 | } | |
681 | return false; | |
682 | } | |
683 | ||
860b69a9 RS |
684 | /* |
685 | * Critical section which runs after acquiring deferred_lock. | |
686 | */ | |
c3f207ab RS |
687 | void |
688 | cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose) | |
689 | { | |
690 | bool is_deferred = false; | |
691 | struct cifs_deferred_close *pdclose; | |
692 | ||
693 | is_deferred = cifs_is_deferred_close(cfile, &pdclose); | |
694 | if (is_deferred) { | |
695 | kfree(dclose); | |
696 | return; | |
697 | } | |
698 | ||
699 | dclose->tlink = cfile->tlink; | |
700 | dclose->netfid = cfile->fid.netfid; | |
701 | dclose->persistent_fid = cfile->fid.persistent_fid; | |
702 | dclose->volatile_fid = cfile->fid.volatile_fid; | |
703 | list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes); | |
704 | } | |
705 | ||
860b69a9 RS |
706 | /* |
707 | * Critical section which runs after acquiring deferred_lock. | |
708 | */ | |
c3f207ab RS |
709 | void |
710 | cifs_del_deferred_close(struct cifsFileInfo *cfile) | |
711 | { | |
712 | bool is_deferred = false; | |
713 | struct cifs_deferred_close *dclose; | |
714 | ||
715 | is_deferred = cifs_is_deferred_close(cfile, &dclose); | |
716 | if (!is_deferred) | |
717 | return; | |
718 | list_del(&dclose->dlist); | |
719 | kfree(dclose); | |
720 | } | |
721 | ||
722 | void | |
723 | cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode) | |
724 | { | |
725 | struct cifsFileInfo *cfile = NULL; | |
726 | struct cifs_deferred_close *dclose; | |
727 | ||
728 | list_for_each_entry(cfile, &cifs_inode->openFileList, flist) { | |
729 | spin_lock(&cifs_inode->deferred_lock); | |
730 | if (cifs_is_deferred_close(cfile, &dclose)) | |
731 | mod_delayed_work(deferredclose_wq, &cfile->deferred, 0); | |
732 | spin_unlock(&cifs_inode->deferred_lock); | |
733 | } | |
734 | } | |
735 | ||
78c09634 RS |
736 | void |
737 | cifs_close_all_deferred_files(struct cifs_tcon *tcon) | |
738 | { | |
739 | struct cifsFileInfo *cfile; | |
78c09634 RS |
740 | struct list_head *tmp; |
741 | ||
742 | spin_lock(&tcon->open_file_lock); | |
743 | list_for_each(tmp, &tcon->openFileList) { | |
744 | cfile = list_entry(tmp, struct cifsFileInfo, tlist); | |
9687c85d RS |
745 | if (delayed_work_pending(&cfile->deferred)) { |
746 | /* | |
747 | * If there is no pending work, mod_delayed_work queues new work. | |
748 | * So, Increase the ref count to avoid use-after-free. | |
749 | */ | |
750 | if (!mod_delayed_work(deferredclose_wq, &cfile->deferred, 0)) | |
751 | cifsFileInfo_get(cfile); | |
752 | } | |
78c09634 RS |
753 | } |
754 | spin_unlock(&tcon->open_file_lock); | |
755 | } | |
756 | ||
4ecce920 AA |
757 | /* parses DFS refferal V3 structure |
758 | * caller is responsible for freeing target_nodes | |
759 | * returns: | |
760 | * - on success - 0 | |
761 | * - on failure - errno | |
762 | */ | |
763 | int | |
764 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
765 | unsigned int *num_of_nodes, | |
766 | struct dfs_info3_param **target_nodes, | |
767 | const struct nls_table *nls_codepage, int remap, | |
768 | const char *searchName, bool is_unicode) | |
769 | { | |
770 | int i, rc = 0; | |
771 | char *data_end; | |
772 | struct dfs_referral_level_3 *ref; | |
773 | ||
774 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
775 | ||
776 | if (*num_of_nodes < 1) { | |
777 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
778 | *num_of_nodes); | |
779 | rc = -EINVAL; | |
780 | goto parse_DFS_referrals_exit; | |
781 | } | |
782 | ||
783 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
784 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
785 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
786 | le16_to_cpu(ref->VersionNumber)); | |
787 | rc = -EINVAL; | |
788 | goto parse_DFS_referrals_exit; | |
789 | } | |
790 | ||
791 | /* get the upper boundary of the resp buffer */ | |
792 | data_end = (char *)rsp + rsp_size; | |
793 | ||
794 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
795 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
796 | ||
797 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
798 | GFP_KERNEL); | |
799 | if (*target_nodes == NULL) { | |
800 | rc = -ENOMEM; | |
801 | goto parse_DFS_referrals_exit; | |
802 | } | |
803 | ||
804 | /* collect necessary data from referrals */ | |
805 | for (i = 0; i < *num_of_nodes; i++) { | |
806 | char *temp; | |
807 | int max_len; | |
808 | struct dfs_info3_param *node = (*target_nodes)+i; | |
809 | ||
810 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
811 | if (is_unicode) { | |
812 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
813 | GFP_KERNEL); | |
814 | if (tmp == NULL) { | |
815 | rc = -ENOMEM; | |
816 | goto parse_DFS_referrals_exit; | |
817 | } | |
818 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
819 | PATH_MAX, nls_codepage, remap); | |
820 | node->path_consumed = cifs_utf16_bytes(tmp, | |
821 | le16_to_cpu(rsp->PathConsumed), | |
822 | nls_codepage); | |
823 | kfree(tmp); | |
824 | } else | |
825 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
826 | ||
827 | node->server_type = le16_to_cpu(ref->ServerType); | |
828 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
829 | ||
830 | /* copy DfsPath */ | |
831 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
832 | max_len = data_end - temp; | |
833 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
834 | is_unicode, nls_codepage); | |
835 | if (!node->path_name) { | |
836 | rc = -ENOMEM; | |
837 | goto parse_DFS_referrals_exit; | |
838 | } | |
839 | ||
840 | /* copy link target UNC */ | |
841 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
842 | max_len = data_end - temp; | |
843 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
844 | is_unicode, nls_codepage); | |
845 | if (!node->node_name) { | |
846 | rc = -ENOMEM; | |
847 | goto parse_DFS_referrals_exit; | |
848 | } | |
849 | ||
e7b602f4 PA |
850 | node->ttl = le32_to_cpu(ref->TimeToLive); |
851 | ||
4ecce920 AA |
852 | ref++; |
853 | } | |
854 | ||
855 | parse_DFS_referrals_exit: | |
856 | if (rc) { | |
857 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
858 | *target_nodes = NULL; | |
859 | *num_of_nodes = 0; | |
860 | } | |
861 | return rc; | |
862 | } | |
ccf7f408 PS |
863 | |
864 | struct cifs_aio_ctx * | |
865 | cifs_aio_ctx_alloc(void) | |
866 | { | |
867 | struct cifs_aio_ctx *ctx; | |
868 | ||
13f5938d JG |
869 | /* |
870 | * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io | |
871 | * to false so that we know when we have to unreference pages within | |
872 | * cifs_aio_ctx_release() | |
873 | */ | |
ccf7f408 PS |
874 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); |
875 | if (!ctx) | |
876 | return NULL; | |
877 | ||
878 | INIT_LIST_HEAD(&ctx->list); | |
879 | mutex_init(&ctx->aio_mutex); | |
880 | init_completion(&ctx->done); | |
881 | kref_init(&ctx->refcount); | |
882 | return ctx; | |
883 | } | |
884 | ||
885 | void | |
886 | cifs_aio_ctx_release(struct kref *refcount) | |
887 | { | |
888 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
889 | struct cifs_aio_ctx, refcount); | |
890 | ||
891 | cifsFileInfo_put(ctx->cfile); | |
13f5938d JG |
892 | |
893 | /* | |
894 | * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly | |
895 | * which means that iov_iter_get_pages() was a success and thus that | |
896 | * we have taken reference on pages. | |
897 | */ | |
898 | if (ctx->bv) { | |
899 | unsigned i; | |
900 | ||
901 | for (i = 0; i < ctx->npages; i++) { | |
902 | if (ctx->should_dirty) | |
903 | set_page_dirty(ctx->bv[i].bv_page); | |
904 | put_page(ctx->bv[i].bv_page); | |
905 | } | |
906 | kvfree(ctx->bv); | |
907 | } | |
908 | ||
ccf7f408 PS |
909 | kfree(ctx); |
910 | } | |
911 | ||
912 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
913 | ||
914 | int | |
915 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
916 | { | |
917 | ssize_t rc; | |
918 | unsigned int cur_npages; | |
919 | unsigned int npages = 0; | |
920 | unsigned int i; | |
921 | size_t len; | |
922 | size_t count = iov_iter_count(iter); | |
923 | unsigned int saved_len; | |
924 | size_t start; | |
925 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
926 | struct page **pages = NULL; | |
927 | struct bio_vec *bv = NULL; | |
928 | ||
00e23707 | 929 | if (iov_iter_is_kvec(iter)) { |
bf1028a4 | 930 | memcpy(&ctx->iter, iter, sizeof(*iter)); |
ccf7f408 PS |
931 | ctx->len = count; |
932 | iov_iter_advance(iter, count); | |
933 | return 0; | |
934 | } | |
935 | ||
bf1028a4 GS |
936 | if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT) |
937 | bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL); | |
ccf7f408 PS |
938 | |
939 | if (!bv) { | |
bf1028a4 | 940 | bv = vmalloc(array_size(max_pages, sizeof(*bv))); |
ccf7f408 PS |
941 | if (!bv) |
942 | return -ENOMEM; | |
943 | } | |
944 | ||
bf1028a4 GS |
945 | if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT) |
946 | pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); | |
ccf7f408 PS |
947 | |
948 | if (!pages) { | |
bf1028a4 | 949 | pages = vmalloc(array_size(max_pages, sizeof(*pages))); |
ecf3411a | 950 | if (!pages) { |
ccf7f408 PS |
951 | kvfree(bv); |
952 | return -ENOMEM; | |
953 | } | |
954 | } | |
955 | ||
956 | saved_len = count; | |
957 | ||
958 | while (count && npages < max_pages) { | |
959 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
960 | if (rc < 0) { | |
a0a3036b | 961 | cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc); |
ccf7f408 PS |
962 | break; |
963 | } | |
964 | ||
965 | if (rc > count) { | |
966 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
967 | count); | |
968 | break; | |
969 | } | |
970 | ||
971 | iov_iter_advance(iter, rc); | |
972 | count -= rc; | |
973 | rc += start; | |
974 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
975 | ||
976 | if (npages + cur_npages > max_pages) { | |
977 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
978 | npages + cur_npages, max_pages); | |
979 | break; | |
980 | } | |
981 | ||
982 | for (i = 0; i < cur_npages; i++) { | |
983 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
984 | bv[npages + i].bv_page = pages[i]; | |
985 | bv[npages + i].bv_offset = start; | |
986 | bv[npages + i].bv_len = len - start; | |
987 | rc -= len; | |
988 | start = 0; | |
989 | } | |
990 | ||
991 | npages += cur_npages; | |
992 | } | |
993 | ||
994 | kvfree(pages); | |
995 | ctx->bv = bv; | |
996 | ctx->len = saved_len - count; | |
997 | ctx->npages = npages; | |
aa563d7b | 998 | iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len); |
ccf7f408 PS |
999 | return 0; |
1000 | } | |
82fb82be AA |
1001 | |
1002 | /** | |
1003 | * cifs_alloc_hash - allocate hash and hash context together | |
1004 | * | |
1005 | * The caller has to make sure @sdesc is initialized to either NULL or | |
1006 | * a valid context. Both can be freed via cifs_free_hash(). | |
1007 | */ | |
1008 | int | |
1009 | cifs_alloc_hash(const char *name, | |
1010 | struct crypto_shash **shash, struct sdesc **sdesc) | |
1011 | { | |
1012 | int rc = 0; | |
1013 | size_t size; | |
1014 | ||
1015 | if (*sdesc != NULL) | |
1016 | return 0; | |
1017 | ||
1018 | *shash = crypto_alloc_shash(name, 0, 0); | |
1019 | if (IS_ERR(*shash)) { | |
a0a3036b | 1020 | cifs_dbg(VFS, "Could not allocate crypto %s\n", name); |
82fb82be AA |
1021 | rc = PTR_ERR(*shash); |
1022 | *shash = NULL; | |
1023 | *sdesc = NULL; | |
1024 | return rc; | |
1025 | } | |
1026 | ||
1027 | size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash); | |
1028 | *sdesc = kmalloc(size, GFP_KERNEL); | |
1029 | if (*sdesc == NULL) { | |
1030 | cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name); | |
1031 | crypto_free_shash(*shash); | |
1032 | *shash = NULL; | |
1033 | return -ENOMEM; | |
1034 | } | |
1035 | ||
1036 | (*sdesc)->shash.tfm = *shash; | |
82fb82be AA |
1037 | return 0; |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * cifs_free_hash - free hash and hash context together | |
1042 | * | |
1043 | * Freeing a NULL hash or context is safe. | |
1044 | */ | |
1045 | void | |
1046 | cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) | |
1047 | { | |
1048 | kfree(*sdesc); | |
1049 | *sdesc = NULL; | |
1050 | if (*shash) | |
1051 | crypto_free_shash(*shash); | |
1052 | *shash = NULL; | |
1053 | } | |
7b7f2bdf LL |
1054 | |
1055 | /** | |
1056 | * rqst_page_get_length - obtain the length and offset for a page in smb_rqst | |
1057 | * Input: rqst - a smb_rqst, page - a page index for rqst | |
1058 | * Output: *len - the length for this page, *offset - the offset for this page | |
1059 | */ | |
1060 | void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, | |
1061 | unsigned int *len, unsigned int *offset) | |
1062 | { | |
1063 | *len = rqst->rq_pagesz; | |
1064 | *offset = (page == 0) ? rqst->rq_offset : 0; | |
1065 | ||
1066 | if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) | |
1067 | *len = rqst->rq_tailsz; | |
1068 | else if (page == 0) | |
1069 | *len = rqst->rq_pagesz - rqst->rq_offset; | |
1070 | } | |
a3a53b76 PA |
1071 | |
1072 | void extract_unc_hostname(const char *unc, const char **h, size_t *len) | |
1073 | { | |
1074 | const char *end; | |
1075 | ||
1076 | /* skip initial slashes */ | |
1077 | while (*unc && (*unc == '\\' || *unc == '/')) | |
1078 | unc++; | |
1079 | ||
1080 | end = unc; | |
1081 | ||
1082 | while (*end && !(*end == '\\' || *end == '/')) | |
1083 | end++; | |
1084 | ||
1085 | *h = unc; | |
1086 | *len = end - unc; | |
1087 | } | |
340625e6 RS |
1088 | |
1089 | /** | |
1090 | * copy_path_name - copy src path to dst, possibly truncating | |
1091 | * | |
1092 | * returns number of bytes written (including trailing nul) | |
1093 | */ | |
1094 | int copy_path_name(char *dst, const char *src) | |
1095 | { | |
1096 | int name_len; | |
1097 | ||
1098 | /* | |
1099 | * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it | |
1100 | * will truncate and strlen(dst) will be PATH_MAX-1 | |
1101 | */ | |
1102 | name_len = strscpy(dst, src, PATH_MAX); | |
1103 | if (WARN_ON_ONCE(name_len < 0)) | |
1104 | name_len = PATH_MAX-1; | |
1105 | ||
1106 | /* we count the trailing nul */ | |
1107 | name_len++; | |
1108 | return name_len; | |
1109 | } | |
bacd704a PAS |
1110 | |
1111 | struct super_cb_data { | |
3786f4bd | 1112 | void *data; |
bacd704a PAS |
1113 | struct super_block *sb; |
1114 | }; | |
1115 | ||
3786f4bd | 1116 | static void tcp_super_cb(struct super_block *sb, void *arg) |
bacd704a | 1117 | { |
3786f4bd PA |
1118 | struct super_cb_data *sd = arg; |
1119 | struct TCP_Server_Info *server = sd->data; | |
bacd704a PAS |
1120 | struct cifs_sb_info *cifs_sb; |
1121 | struct cifs_tcon *tcon; | |
1122 | ||
3786f4bd | 1123 | if (sd->sb) |
bacd704a PAS |
1124 | return; |
1125 | ||
1126 | cifs_sb = CIFS_SB(sb); | |
1127 | tcon = cifs_sb_master_tcon(cifs_sb); | |
3786f4bd PA |
1128 | if (tcon->ses->server == server) |
1129 | sd->sb = sb; | |
bacd704a PAS |
1130 | } |
1131 | ||
3786f4bd PA |
1132 | static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *), |
1133 | void *data) | |
bacd704a | 1134 | { |
3786f4bd PA |
1135 | struct super_cb_data sd = { |
1136 | .data = data, | |
bacd704a PAS |
1137 | .sb = NULL, |
1138 | }; | |
1139 | ||
3786f4bd | 1140 | iterate_supers_type(&cifs_fs_type, f, &sd); |
bacd704a | 1141 | |
3786f4bd PA |
1142 | if (!sd.sb) |
1143 | return ERR_PTR(-EINVAL); | |
bacd704a PAS |
1144 | /* |
1145 | * Grab an active reference in order to prevent automounts (DFS links) | |
1146 | * of expiring and then freeing up our cifs superblock pointer while | |
1147 | * we're doing failover. | |
1148 | */ | |
3786f4bd PA |
1149 | cifs_sb_active(sd.sb); |
1150 | return sd.sb; | |
bacd704a PAS |
1151 | } |
1152 | ||
3786f4bd | 1153 | static void __cifs_put_super(struct super_block *sb) |
bacd704a PAS |
1154 | { |
1155 | if (!IS_ERR_OR_NULL(sb)) | |
1156 | cifs_sb_deactive(sb); | |
1157 | } | |
1158 | ||
3786f4bd PA |
1159 | struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server) |
1160 | { | |
1161 | return __cifs_get_super(tcp_super_cb, server); | |
1162 | } | |
1163 | ||
1164 | void cifs_put_tcp_super(struct super_block *sb) | |
1165 | { | |
1166 | __cifs_put_super(sb); | |
1167 | } | |
1168 | ||
1169 | #ifdef CONFIG_CIFS_DFS_UPCALL | |
e4af35fa PA |
1170 | int match_target_ip(struct TCP_Server_Info *server, |
1171 | const char *share, size_t share_len, | |
1172 | bool *result) | |
1173 | { | |
1174 | int rc; | |
1175 | char *target, *tip = NULL; | |
1176 | struct sockaddr tipaddr; | |
1177 | ||
1178 | *result = false; | |
1179 | ||
1180 | target = kzalloc(share_len + 3, GFP_KERNEL); | |
1181 | if (!target) { | |
1182 | rc = -ENOMEM; | |
1183 | goto out; | |
1184 | } | |
1185 | ||
1186 | scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share); | |
1187 | ||
1188 | cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2); | |
1189 | ||
506c1da4 | 1190 | rc = dns_resolve_server_name_to_ip(target, &tip, NULL); |
e4af35fa PA |
1191 | if (rc < 0) |
1192 | goto out; | |
1193 | ||
1194 | cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip); | |
1195 | ||
1196 | if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) { | |
1197 | cifs_dbg(VFS, "%s: failed to convert target ip address\n", | |
1198 | __func__); | |
1199 | rc = -EINVAL; | |
1200 | goto out; | |
1201 | } | |
1202 | ||
1203 | *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, | |
1204 | &tipaddr); | |
1205 | cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result); | |
1206 | rc = 0; | |
1207 | ||
1208 | out: | |
1209 | kfree(target); | |
1210 | kfree(tip); | |
1211 | ||
1212 | return rc; | |
1213 | } | |
1214 | ||
3786f4bd PA |
1215 | static void tcon_super_cb(struct super_block *sb, void *arg) |
1216 | { | |
1217 | struct super_cb_data *sd = arg; | |
1218 | struct cifs_tcon *tcon = sd->data; | |
1219 | struct cifs_sb_info *cifs_sb; | |
1220 | ||
1221 | if (sd->sb) | |
1222 | return; | |
1223 | ||
1224 | cifs_sb = CIFS_SB(sb); | |
1225 | if (tcon->dfs_path && cifs_sb->origin_fullpath && | |
1226 | !strcasecmp(tcon->dfs_path, cifs_sb->origin_fullpath)) | |
1227 | sd->sb = sb; | |
1228 | } | |
1229 | ||
1230 | static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon) | |
1231 | { | |
1232 | return __cifs_get_super(tcon_super_cb, tcon); | |
1233 | } | |
1234 | ||
1235 | static inline void cifs_put_tcon_super(struct super_block *sb) | |
1236 | { | |
1237 | __cifs_put_super(sb); | |
1238 | } | |
1239 | #else | |
1240 | static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon) | |
1241 | { | |
1242 | return ERR_PTR(-EOPNOTSUPP); | |
1243 | } | |
1244 | ||
1245 | static inline void cifs_put_tcon_super(struct super_block *sb) | |
1246 | { | |
1247 | } | |
1248 | #endif | |
1249 | ||
7548e1da | 1250 | int update_super_prepath(struct cifs_tcon *tcon, char *prefix) |
bacd704a PAS |
1251 | { |
1252 | struct super_block *sb; | |
1253 | struct cifs_sb_info *cifs_sb; | |
1254 | int rc = 0; | |
1255 | ||
3786f4bd | 1256 | sb = cifs_get_tcon_super(tcon); |
bacd704a PAS |
1257 | if (IS_ERR(sb)) |
1258 | return PTR_ERR(sb); | |
1259 | ||
1260 | cifs_sb = CIFS_SB(sb); | |
1261 | ||
1262 | kfree(cifs_sb->prepath); | |
1263 | ||
7548e1da | 1264 | if (prefix && *prefix) { |
8d767223 | 1265 | cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC); |
bacd704a PAS |
1266 | if (!cifs_sb->prepath) { |
1267 | rc = -ENOMEM; | |
1268 | goto out; | |
1269 | } | |
1270 | ||
1271 | convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); | |
1272 | } else | |
1273 | cifs_sb->prepath = NULL; | |
1274 | ||
1275 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; | |
1276 | ||
1277 | out: | |
3786f4bd | 1278 | cifs_put_tcon_super(sb); |
bacd704a PAS |
1279 | return rc; |
1280 | } |