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