Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / cifs / smb1ops.c
blobe31b939e628cc4f8c0d195290f6ed6bdae037a47
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SMB1 (CIFS) version specific operations
5 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
6 */
8 #include <linux/pagemap.h>
9 #include <linux/vfs.h>
10 #include "cifsglob.h"
11 #include "cifsproto.h"
12 #include "cifs_debug.h"
13 #include "cifspdu.h"
14 #include "cifs_unicode.h"
15 #include "fs_context.h"
18 * An NT cancel request header looks just like the original request except:
20 * The Command is SMB_COM_NT_CANCEL
21 * The WordCount is zeroed out
22 * The ByteCount is zeroed out
24 * This function mangles an existing request buffer into a
25 * SMB_COM_NT_CANCEL request and then sends it.
27 static int
28 send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,
29 struct mid_q_entry *mid)
31 int rc = 0;
32 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
34 /* -4 for RFC1001 length and +2 for BCC field */
35 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
36 in_buf->Command = SMB_COM_NT_CANCEL;
37 in_buf->WordCount = 0;
38 put_bcc(0, in_buf);
40 mutex_lock(&server->srv_mutex);
41 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
42 if (rc) {
43 mutex_unlock(&server->srv_mutex);
44 return rc;
48 * The response to this call was already factored into the sequence
49 * number when the call went out, so we must adjust it back downward
50 * after signing here.
52 --server->sequence_number;
53 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
54 if (rc < 0)
55 server->sequence_number--;
57 mutex_unlock(&server->srv_mutex);
59 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
60 get_mid(in_buf), rc);
62 return rc;
65 static bool
66 cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
68 return ob1->fid.netfid == ob2->fid.netfid;
71 static unsigned int
72 cifs_read_data_offset(char *buf)
74 READ_RSP *rsp = (READ_RSP *)buf;
75 return le16_to_cpu(rsp->DataOffset);
78 static unsigned int
79 cifs_read_data_length(char *buf, bool in_remaining)
81 READ_RSP *rsp = (READ_RSP *)buf;
82 /* It's a bug reading remaining data for SMB1 packets */
83 WARN_ON(in_remaining);
84 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
85 le16_to_cpu(rsp->DataLength);
88 static struct mid_q_entry *
89 cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
91 struct smb_hdr *buf = (struct smb_hdr *)buffer;
92 struct mid_q_entry *mid;
94 spin_lock(&GlobalMid_Lock);
95 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
96 if (compare_mid(mid->mid, buf) &&
97 mid->mid_state == MID_REQUEST_SUBMITTED &&
98 le16_to_cpu(mid->command) == buf->Command) {
99 kref_get(&mid->refcount);
100 spin_unlock(&GlobalMid_Lock);
101 return mid;
104 spin_unlock(&GlobalMid_Lock);
105 return NULL;
108 static void
109 cifs_add_credits(struct TCP_Server_Info *server,
110 const struct cifs_credits *credits, const int optype)
112 spin_lock(&server->req_lock);
113 server->credits += credits->value;
114 server->in_flight--;
115 spin_unlock(&server->req_lock);
116 wake_up(&server->request_q);
119 static void
120 cifs_set_credits(struct TCP_Server_Info *server, const int val)
122 spin_lock(&server->req_lock);
123 server->credits = val;
124 server->oplocks = val > 1 ? enable_oplocks : false;
125 spin_unlock(&server->req_lock);
128 static int *
129 cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
131 return &server->credits;
134 static unsigned int
135 cifs_get_credits(struct mid_q_entry *mid)
137 return 1;
141 * Find a free multiplex id (SMB mid). Otherwise there could be
142 * mid collisions which might cause problems, demultiplexing the
143 * wrong response to this request. Multiplex ids could collide if
144 * one of a series requests takes much longer than the others, or
145 * if a very large number of long lived requests (byte range
146 * locks or FindNotify requests) are pending. No more than
147 * 64K-1 requests can be outstanding at one time. If no
148 * mids are available, return zero. A future optimization
149 * could make the combination of mids and uid the key we use
150 * to demultiplex on (rather than mid alone).
151 * In addition to the above check, the cifs demultiplex
152 * code already used the command code as a secondary
153 * check of the frame and if signing is negotiated the
154 * response would be discarded if the mid were the same
155 * but the signature was wrong. Since the mid is not put in the
156 * pending queue until later (when it is about to be dispatched)
157 * we do have to limit the number of outstanding requests
158 * to somewhat less than 64K-1 although it is hard to imagine
159 * so many threads being in the vfs at one time.
161 static __u64
162 cifs_get_next_mid(struct TCP_Server_Info *server)
164 __u64 mid = 0;
165 __u16 last_mid, cur_mid;
166 bool collision;
168 spin_lock(&GlobalMid_Lock);
170 /* mid is 16 bit only for CIFS/SMB */
171 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
172 /* we do not want to loop forever */
173 last_mid = cur_mid;
174 cur_mid++;
175 /* avoid 0xFFFF MID */
176 if (cur_mid == 0xffff)
177 cur_mid++;
180 * This nested loop looks more expensive than it is.
181 * In practice the list of pending requests is short,
182 * fewer than 50, and the mids are likely to be unique
183 * on the first pass through the loop unless some request
184 * takes longer than the 64 thousand requests before it
185 * (and it would also have to have been a request that
186 * did not time out).
188 while (cur_mid != last_mid) {
189 struct mid_q_entry *mid_entry;
190 unsigned int num_mids;
192 collision = false;
193 if (cur_mid == 0)
194 cur_mid++;
196 num_mids = 0;
197 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
198 ++num_mids;
199 if (mid_entry->mid == cur_mid &&
200 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
201 /* This mid is in use, try a different one */
202 collision = true;
203 break;
208 * if we have more than 32k mids in the list, then something
209 * is very wrong. Possibly a local user is trying to DoS the
210 * box by issuing long-running calls and SIGKILL'ing them. If
211 * we get to 2^16 mids then we're in big trouble as this
212 * function could loop forever.
214 * Go ahead and assign out the mid in this situation, but force
215 * an eventual reconnect to clean out the pending_mid_q.
217 if (num_mids > 32768)
218 server->tcpStatus = CifsNeedReconnect;
220 if (!collision) {
221 mid = (__u64)cur_mid;
222 server->CurrentMid = mid;
223 break;
225 cur_mid++;
227 spin_unlock(&GlobalMid_Lock);
228 return mid;
232 return codes:
233 0 not a transact2, or all data present
234 >0 transact2 with that much data missing
235 -EINVAL invalid transact2
237 static int
238 check2ndT2(char *buf)
240 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
241 struct smb_t2_rsp *pSMBt;
242 int remaining;
243 __u16 total_data_size, data_in_this_rsp;
245 if (pSMB->Command != SMB_COM_TRANSACTION2)
246 return 0;
248 /* check for plausible wct, bcc and t2 data and parm sizes */
249 /* check for parm and data offset going beyond end of smb */
250 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
251 cifs_dbg(FYI, "Invalid transact2 word count\n");
252 return -EINVAL;
255 pSMBt = (struct smb_t2_rsp *)pSMB;
257 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
258 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
260 if (total_data_size == data_in_this_rsp)
261 return 0;
262 else if (total_data_size < data_in_this_rsp) {
263 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
264 total_data_size, data_in_this_rsp);
265 return -EINVAL;
268 remaining = total_data_size - data_in_this_rsp;
270 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
271 remaining);
272 if (total_data_size > CIFSMaxBufSize) {
273 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
274 total_data_size, CIFSMaxBufSize);
275 return -EINVAL;
277 return remaining;
280 static int
281 coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
283 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
284 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
285 char *data_area_of_tgt;
286 char *data_area_of_src;
287 int remaining;
288 unsigned int byte_count, total_in_tgt;
289 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
291 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
292 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
294 if (tgt_total_cnt != src_total_cnt)
295 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
296 src_total_cnt, tgt_total_cnt);
298 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
300 remaining = tgt_total_cnt - total_in_tgt;
302 if (remaining < 0) {
303 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",
304 tgt_total_cnt, total_in_tgt);
305 return -EPROTO;
308 if (remaining == 0) {
309 /* nothing to do, ignore */
310 cifs_dbg(FYI, "no more data remains\n");
311 return 0;
314 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
315 if (remaining < total_in_src)
316 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
318 /* find end of first SMB data area */
319 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
320 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
322 /* validate target area */
323 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
324 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
326 data_area_of_tgt += total_in_tgt;
328 total_in_tgt += total_in_src;
329 /* is the result too big for the field? */
330 if (total_in_tgt > USHRT_MAX) {
331 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
332 total_in_tgt);
333 return -EPROTO;
335 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
337 /* fix up the BCC */
338 byte_count = get_bcc(target_hdr);
339 byte_count += total_in_src;
340 /* is the result too big for the field? */
341 if (byte_count > USHRT_MAX) {
342 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
343 return -EPROTO;
345 put_bcc(byte_count, target_hdr);
347 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
348 byte_count += total_in_src;
349 /* don't allow buffer to overflow */
350 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
351 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
352 byte_count);
353 return -ENOBUFS;
355 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
357 /* copy second buffer into end of first buffer */
358 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
360 if (remaining != total_in_src) {
361 /* more responses to go */
362 cifs_dbg(FYI, "waiting for more secondary responses\n");
363 return 1;
366 /* we are done */
367 cifs_dbg(FYI, "found the last secondary response\n");
368 return 0;
371 static void
372 cifs_downgrade_oplock(struct TCP_Server_Info *server,
373 struct cifsInodeInfo *cinode, __u32 oplock,
374 unsigned int epoch, bool *purge_cache)
376 cifs_set_oplock_level(cinode, oplock);
379 static bool
380 cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
381 char *buf, int malformed)
383 if (malformed)
384 return false;
385 if (check2ndT2(buf) <= 0)
386 return false;
387 mid->multiRsp = true;
388 if (mid->resp_buf) {
389 /* merge response - fix up 1st*/
390 malformed = coalesce_t2(buf, mid->resp_buf);
391 if (malformed > 0)
392 return true;
393 /* All parts received or packet is malformed. */
394 mid->multiEnd = true;
395 dequeue_mid(mid, malformed);
396 return true;
398 if (!server->large_buf) {
399 /*FIXME: switch to already allocated largebuf?*/
400 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
401 } else {
402 /* Have first buffer */
403 mid->resp_buf = buf;
404 mid->large_buf = true;
405 server->bigbuf = NULL;
407 return true;
410 static bool
411 cifs_need_neg(struct TCP_Server_Info *server)
413 return server->maxBuf == 0;
416 static int
417 cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
419 int rc;
420 rc = CIFSSMBNegotiate(xid, ses);
421 if (rc == -EAGAIN) {
422 /* retry only once on 1st time connection */
423 set_credits(ses->server, 1);
424 rc = CIFSSMBNegotiate(xid, ses);
425 if (rc == -EAGAIN)
426 rc = -EHOSTDOWN;
428 return rc;
431 static unsigned int
432 cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
434 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
435 struct TCP_Server_Info *server = tcon->ses->server;
436 unsigned int wsize;
438 /* start with specified wsize, or default */
439 if (ctx->wsize)
440 wsize = ctx->wsize;
441 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
442 wsize = CIFS_DEFAULT_IOSIZE;
443 else
444 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
446 /* can server support 24-bit write sizes? (via UNIX extensions) */
447 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
448 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
451 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
452 * Limit it to max buffer offered by the server, minus the size of the
453 * WRITEX header, not including the 4 byte RFC1001 length.
455 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
456 (!(server->capabilities & CAP_UNIX) && server->sign))
457 wsize = min_t(unsigned int, wsize,
458 server->maxBuf - sizeof(WRITE_REQ) + 4);
460 /* hard limit of CIFS_MAX_WSIZE */
461 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
463 return wsize;
466 static unsigned int
467 cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
469 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
470 struct TCP_Server_Info *server = tcon->ses->server;
471 unsigned int rsize, defsize;
474 * Set default value...
476 * HACK alert! Ancient servers have very small buffers. Even though
477 * MS-CIFS indicates that servers are only limited by the client's
478 * bufsize for reads, testing against win98se shows that it throws
479 * INVALID_PARAMETER errors if you try to request too large a read.
480 * OS/2 just sends back short reads.
482 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
483 * it can't handle a read request larger than its MaxBufferSize either.
485 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
486 defsize = CIFS_DEFAULT_IOSIZE;
487 else if (server->capabilities & CAP_LARGE_READ_X)
488 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
489 else
490 defsize = server->maxBuf - sizeof(READ_RSP);
492 rsize = ctx->rsize ? ctx->rsize : defsize;
495 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
496 * the client's MaxBufferSize.
498 if (!(server->capabilities & CAP_LARGE_READ_X))
499 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
501 /* hard limit of CIFS_MAX_RSIZE */
502 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
504 return rsize;
507 static void
508 cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
509 struct cifs_sb_info *cifs_sb)
511 CIFSSMBQFSDeviceInfo(xid, tcon);
512 CIFSSMBQFSAttributeInfo(xid, tcon);
515 static int
516 cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
517 struct cifs_sb_info *cifs_sb, const char *full_path)
519 int rc;
520 FILE_ALL_INFO *file_info;
522 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
523 if (file_info == NULL)
524 return -ENOMEM;
526 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
527 0 /* not legacy */, cifs_sb->local_nls,
528 cifs_remap(cifs_sb));
530 if (rc == -EOPNOTSUPP || rc == -EINVAL)
531 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
532 cifs_sb->local_nls, cifs_remap(cifs_sb));
533 kfree(file_info);
534 return rc;
537 static int
538 cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
539 struct cifs_sb_info *cifs_sb, const char *full_path,
540 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
542 int rc;
544 *symlink = false;
546 /* could do find first instead but this returns more info */
547 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
548 cifs_sb->local_nls, cifs_remap(cifs_sb));
550 * BB optimize code so we do not make the above call when server claims
551 * no NT SMB support and the above call failed at least once - set flag
552 * in tcon or mount.
554 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
555 rc = SMBQueryInformation(xid, tcon, full_path, data,
556 cifs_sb->local_nls,
557 cifs_remap(cifs_sb));
558 *adjustTZ = true;
561 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
562 int tmprc;
563 int oplock = 0;
564 struct cifs_fid fid;
565 struct cifs_open_parms oparms;
567 oparms.tcon = tcon;
568 oparms.cifs_sb = cifs_sb;
569 oparms.desired_access = FILE_READ_ATTRIBUTES;
570 oparms.create_options = cifs_create_options(cifs_sb, 0);
571 oparms.disposition = FILE_OPEN;
572 oparms.path = full_path;
573 oparms.fid = &fid;
574 oparms.reconnect = false;
576 /* Need to check if this is a symbolic link or not */
577 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);
578 if (tmprc == -EOPNOTSUPP)
579 *symlink = true;
580 else if (tmprc == 0)
581 CIFSSMBClose(xid, tcon, fid.netfid);
584 return rc;
587 static int
588 cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
589 struct cifs_sb_info *cifs_sb, const char *full_path,
590 u64 *uniqueid, FILE_ALL_INFO *data)
593 * We can not use the IndexNumber field by default from Windows or
594 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
595 * CIFS spec claims that this value is unique within the scope of a
596 * share, and the windows docs hint that it's actually unique
597 * per-machine.
599 * There may be higher info levels that work but are there Windows
600 * server or network appliances for which IndexNumber field is not
601 * guaranteed unique?
603 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
604 cifs_sb->local_nls,
605 cifs_remap(cifs_sb));
608 static int
609 cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
610 struct cifs_fid *fid, FILE_ALL_INFO *data)
612 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
615 static void
616 cifs_clear_stats(struct cifs_tcon *tcon)
618 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
619 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
620 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
621 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
622 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
623 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
624 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
625 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
626 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
627 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
634 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
635 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
636 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
637 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
638 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
641 static void
642 cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
644 seq_printf(m, " Oplocks breaks: %d",
645 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
646 seq_printf(m, "\nReads: %d Bytes: %llu",
647 atomic_read(&tcon->stats.cifs_stats.num_reads),
648 (long long)(tcon->bytes_read));
649 seq_printf(m, "\nWrites: %d Bytes: %llu",
650 atomic_read(&tcon->stats.cifs_stats.num_writes),
651 (long long)(tcon->bytes_written));
652 seq_printf(m, "\nFlushes: %d",
653 atomic_read(&tcon->stats.cifs_stats.num_flushes));
654 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
655 atomic_read(&tcon->stats.cifs_stats.num_locks),
656 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
657 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
658 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
659 atomic_read(&tcon->stats.cifs_stats.num_opens),
660 atomic_read(&tcon->stats.cifs_stats.num_closes),
661 atomic_read(&tcon->stats.cifs_stats.num_deletes));
662 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
663 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
664 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
665 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
666 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
667 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
668 seq_printf(m, "\nRenames: %d T2 Renames %d",
669 atomic_read(&tcon->stats.cifs_stats.num_renames),
670 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
671 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
672 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
673 atomic_read(&tcon->stats.cifs_stats.num_fnext),
674 atomic_read(&tcon->stats.cifs_stats.num_fclose));
677 static void
678 cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
679 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
680 const unsigned int xid)
682 FILE_BASIC_INFO info;
683 struct cifsInodeInfo *cifsInode;
684 u32 dosattrs;
685 int rc;
687 memset(&info, 0, sizeof(info));
688 cifsInode = CIFS_I(inode);
689 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
690 info.Attributes = cpu_to_le32(dosattrs);
691 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
692 cifs_sb);
693 if (rc == 0)
694 cifsInode->cifsAttrs = dosattrs;
697 static int
698 cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
699 __u32 *oplock, FILE_ALL_INFO *buf)
701 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
702 return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
703 oparms->disposition,
704 oparms->desired_access,
705 oparms->create_options,
706 &oparms->fid->netfid, oplock, buf,
707 oparms->cifs_sb->local_nls,
708 cifs_remap(oparms->cifs_sb));
709 return CIFS_open(xid, oparms, oplock, buf);
712 static void
713 cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
715 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
716 cfile->fid.netfid = fid->netfid;
717 cifs_set_oplock_level(cinode, oplock);
718 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
721 static void
722 cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
723 struct cifs_fid *fid)
725 CIFSSMBClose(xid, tcon, fid->netfid);
728 static int
729 cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
730 struct cifs_fid *fid)
732 return CIFSSMBFlush(xid, tcon, fid->netfid);
735 static int
736 cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,
737 struct cifs_io_parms *parms, unsigned int *bytes_read,
738 char **buf, int *buf_type)
740 parms->netfid = pfid->netfid;
741 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
744 static int
745 cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,
746 struct cifs_io_parms *parms, unsigned int *written,
747 struct kvec *iov, unsigned long nr_segs)
750 parms->netfid = pfid->netfid;
751 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
754 static int
755 smb_set_file_info(struct inode *inode, const char *full_path,
756 FILE_BASIC_INFO *buf, const unsigned int xid)
758 int oplock = 0;
759 int rc;
760 __u32 netpid;
761 struct cifs_fid fid;
762 struct cifs_open_parms oparms;
763 struct cifsFileInfo *open_file;
764 struct cifsInodeInfo *cinode = CIFS_I(inode);
765 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
766 struct tcon_link *tlink = NULL;
767 struct cifs_tcon *tcon;
769 /* if the file is already open for write, just use that fileid */
770 open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY);
771 if (open_file) {
772 fid.netfid = open_file->fid.netfid;
773 netpid = open_file->pid;
774 tcon = tlink_tcon(open_file->tlink);
775 goto set_via_filehandle;
778 tlink = cifs_sb_tlink(cifs_sb);
779 if (IS_ERR(tlink)) {
780 rc = PTR_ERR(tlink);
781 tlink = NULL;
782 goto out;
784 tcon = tlink_tcon(tlink);
786 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
787 cifs_sb);
788 if (rc == 0) {
789 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
790 goto out;
791 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
792 goto out;
795 oparms.tcon = tcon;
796 oparms.cifs_sb = cifs_sb;
797 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
798 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
799 oparms.disposition = FILE_OPEN;
800 oparms.path = full_path;
801 oparms.fid = &fid;
802 oparms.reconnect = false;
804 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
805 rc = CIFS_open(xid, &oparms, &oplock, NULL);
806 if (rc != 0) {
807 if (rc == -EIO)
808 rc = -EINVAL;
809 goto out;
812 netpid = current->tgid;
814 set_via_filehandle:
815 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);
816 if (!rc)
817 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
819 if (open_file == NULL)
820 CIFSSMBClose(xid, tcon, fid.netfid);
821 else
822 cifsFileInfo_put(open_file);
823 out:
824 if (tlink != NULL)
825 cifs_put_tlink(tlink);
826 return rc;
829 static int
830 cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
831 struct cifsFileInfo *cfile)
833 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
836 static int
837 cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
838 const char *path, struct cifs_sb_info *cifs_sb,
839 struct cifs_fid *fid, __u16 search_flags,
840 struct cifs_search_info *srch_inf)
842 int rc;
844 rc = CIFSFindFirst(xid, tcon, path, cifs_sb,
845 &fid->netfid, search_flags, srch_inf, true);
846 if (rc)
847 cifs_dbg(FYI, "find first failed=%d\n", rc);
848 return rc;
851 static int
852 cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
853 struct cifs_fid *fid, __u16 search_flags,
854 struct cifs_search_info *srch_inf)
856 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
859 static int
860 cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
861 struct cifs_fid *fid)
863 return CIFSFindClose(xid, tcon, fid->netfid);
866 static int
867 cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
868 struct cifsInodeInfo *cinode)
870 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
871 LOCKING_ANDX_OPLOCK_RELEASE, false,
872 CIFS_CACHE_READ(cinode) ? 1 : 0);
875 static int
876 cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
877 struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
879 int rc = -EOPNOTSUPP;
881 buf->f_type = CIFS_MAGIC_NUMBER;
884 * We could add a second check for a QFS Unix capability bit
886 if ((tcon->ses->capabilities & CAP_UNIX) &&
887 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
888 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
891 * Only need to call the old QFSInfo if failed on newer one,
892 * e.g. by OS/2.
894 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
895 rc = CIFSSMBQFSInfo(xid, tcon, buf);
898 * Some old Windows servers also do not support level 103, retry with
899 * older level one if old server failed the previous call or we
900 * bypassed it because we detected that this was an older LANMAN sess
902 if (rc)
903 rc = SMBOldQFSInfo(xid, tcon, buf);
904 return rc;
907 static int
908 cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
909 __u64 length, __u32 type, int lock, int unlock, bool wait)
911 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
912 current->tgid, length, offset, unlock, lock,
913 (__u8)type, wait, 0);
916 static int
917 cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
918 const unsigned char *searchName, char **symlinkinfo,
919 const struct nls_table *nls_codepage)
921 #ifdef CONFIG_CIFS_DFS_UPCALL
922 int rc;
923 struct dfs_info3_param referral = {0};
925 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral,
928 if (!rc) {
929 *symlinkinfo = kstrndup(referral.node_name,
930 strlen(referral.node_name),
931 GFP_KERNEL);
932 free_dfs_info_param(&referral);
933 if (!*symlinkinfo)
934 rc = -ENOMEM;
936 return rc;
937 #else /* No DFS support */
938 return -EREMOTE;
939 #endif
942 static int
943 cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
944 struct cifs_sb_info *cifs_sb, const char *full_path,
945 char **target_path, bool is_reparse_point)
947 int rc;
948 int oplock = 0;
949 struct cifs_fid fid;
950 struct cifs_open_parms oparms;
952 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
954 if (is_reparse_point) {
955 cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n");
956 return -EOPNOTSUPP;
959 /* Check for unix extensions */
960 if (cap_unix(tcon->ses)) {
961 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
962 cifs_sb->local_nls,
963 cifs_remap(cifs_sb));
964 if (rc == -EREMOTE)
965 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
966 target_path,
967 cifs_sb->local_nls);
969 goto out;
972 oparms.tcon = tcon;
973 oparms.cifs_sb = cifs_sb;
974 oparms.desired_access = FILE_READ_ATTRIBUTES;
975 oparms.create_options = cifs_create_options(cifs_sb,
976 OPEN_REPARSE_POINT);
977 oparms.disposition = FILE_OPEN;
978 oparms.path = full_path;
979 oparms.fid = &fid;
980 oparms.reconnect = false;
982 rc = CIFS_open(xid, &oparms, &oplock, NULL);
983 if (rc)
984 goto out;
986 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path,
987 cifs_sb->local_nls);
988 if (rc)
989 goto out_close;
991 convert_delimiter(*target_path, '/');
992 out_close:
993 CIFSSMBClose(xid, tcon, fid.netfid);
994 out:
995 if (!rc)
996 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
997 return rc;
1000 static bool
1001 cifs_is_read_op(__u32 oplock)
1003 return oplock == OPLOCK_READ;
1006 static unsigned int
1007 cifs_wp_retry_size(struct inode *inode)
1009 return CIFS_SB(inode->i_sb)->ctx->wsize;
1012 static bool
1013 cifs_dir_needs_close(struct cifsFileInfo *cfile)
1015 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;
1018 static bool
1019 cifs_can_echo(struct TCP_Server_Info *server)
1021 if (server->tcpStatus == CifsGood)
1022 return true;
1024 return false;
1027 static int
1028 cifs_make_node(unsigned int xid, struct inode *inode,
1029 struct dentry *dentry, struct cifs_tcon *tcon,
1030 char *full_path, umode_t mode, dev_t dev)
1032 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1033 struct inode *newinode = NULL;
1034 int rc = -EPERM;
1035 FILE_ALL_INFO *buf = NULL;
1036 struct cifs_io_parms io_parms;
1037 __u32 oplock = 0;
1038 struct cifs_fid fid;
1039 struct cifs_open_parms oparms;
1040 unsigned int bytes_written;
1041 struct win_dev *pdev;
1042 struct kvec iov[2];
1044 if (tcon->unix_ext) {
1046 * SMB1 Unix Extensions: requires server support but
1047 * works with all special files
1049 struct cifs_unix_set_info_args args = {
1050 .mode = mode & ~current_umask(),
1051 .ctime = NO_CHANGE_64,
1052 .atime = NO_CHANGE_64,
1053 .mtime = NO_CHANGE_64,
1054 .device = dev,
1056 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1057 args.uid = current_fsuid();
1058 args.gid = current_fsgid();
1059 } else {
1060 args.uid = INVALID_UID; /* no change */
1061 args.gid = INVALID_GID; /* no change */
1063 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1064 cifs_sb->local_nls,
1065 cifs_remap(cifs_sb));
1066 if (rc)
1067 goto out;
1069 rc = cifs_get_inode_info_unix(&newinode, full_path,
1070 inode->i_sb, xid);
1072 if (rc == 0)
1073 d_instantiate(dentry, newinode);
1074 goto out;
1078 * SMB1 SFU emulation: should work with all servers, but only
1079 * support block and char device (no socket & fifo)
1081 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
1082 goto out;
1084 if (!S_ISCHR(mode) && !S_ISBLK(mode))
1085 goto out;
1087 cifs_dbg(FYI, "sfu compat create special file\n");
1089 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
1090 if (buf == NULL) {
1091 rc = -ENOMEM;
1092 goto out;
1095 oparms.tcon = tcon;
1096 oparms.cifs_sb = cifs_sb;
1097 oparms.desired_access = GENERIC_WRITE;
1098 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
1099 CREATE_OPTION_SPECIAL);
1100 oparms.disposition = FILE_CREATE;
1101 oparms.path = full_path;
1102 oparms.fid = &fid;
1103 oparms.reconnect = false;
1105 if (tcon->ses->server->oplocks)
1106 oplock = REQ_OPLOCK;
1107 else
1108 oplock = 0;
1109 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
1110 if (rc)
1111 goto out;
1114 * BB Do not bother to decode buf since no local inode yet to put
1115 * timestamps in, but we can reuse it safely.
1118 pdev = (struct win_dev *)buf;
1119 io_parms.pid = current->tgid;
1120 io_parms.tcon = tcon;
1121 io_parms.offset = 0;
1122 io_parms.length = sizeof(struct win_dev);
1123 iov[1].iov_base = buf;
1124 iov[1].iov_len = sizeof(struct win_dev);
1125 if (S_ISCHR(mode)) {
1126 memcpy(pdev->type, "IntxCHR", 8);
1127 pdev->major = cpu_to_le64(MAJOR(dev));
1128 pdev->minor = cpu_to_le64(MINOR(dev));
1129 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1130 &bytes_written, iov, 1);
1131 } else if (S_ISBLK(mode)) {
1132 memcpy(pdev->type, "IntxBLK", 8);
1133 pdev->major = cpu_to_le64(MAJOR(dev));
1134 pdev->minor = cpu_to_le64(MINOR(dev));
1135 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1136 &bytes_written, iov, 1);
1138 tcon->ses->server->ops->close(xid, tcon, &fid);
1139 d_drop(dentry);
1141 /* FIXME: add code here to set EAs */
1142 out:
1143 kfree(buf);
1144 return rc;
1149 struct smb_version_operations smb1_operations = {
1150 .send_cancel = send_nt_cancel,
1151 .compare_fids = cifs_compare_fids,
1152 .setup_request = cifs_setup_request,
1153 .setup_async_request = cifs_setup_async_request,
1154 .check_receive = cifs_check_receive,
1155 .add_credits = cifs_add_credits,
1156 .set_credits = cifs_set_credits,
1157 .get_credits_field = cifs_get_credits_field,
1158 .get_credits = cifs_get_credits,
1159 .wait_mtu_credits = cifs_wait_mtu_credits,
1160 .get_next_mid = cifs_get_next_mid,
1161 .read_data_offset = cifs_read_data_offset,
1162 .read_data_length = cifs_read_data_length,
1163 .map_error = map_smb_to_linux_error,
1164 .find_mid = cifs_find_mid,
1165 .check_message = checkSMB,
1166 .dump_detail = cifs_dump_detail,
1167 .clear_stats = cifs_clear_stats,
1168 .print_stats = cifs_print_stats,
1169 .is_oplock_break = is_valid_oplock_break,
1170 .downgrade_oplock = cifs_downgrade_oplock,
1171 .check_trans2 = cifs_check_trans2,
1172 .need_neg = cifs_need_neg,
1173 .negotiate = cifs_negotiate,
1174 .negotiate_wsize = cifs_negotiate_wsize,
1175 .negotiate_rsize = cifs_negotiate_rsize,
1176 .sess_setup = CIFS_SessSetup,
1177 .logoff = CIFSSMBLogoff,
1178 .tree_connect = CIFSTCon,
1179 .tree_disconnect = CIFSSMBTDis,
1180 .get_dfs_refer = CIFSGetDFSRefer,
1181 .qfs_tcon = cifs_qfs_tcon,
1182 .is_path_accessible = cifs_is_path_accessible,
1183 .can_echo = cifs_can_echo,
1184 .query_path_info = cifs_query_path_info,
1185 .query_file_info = cifs_query_file_info,
1186 .get_srv_inum = cifs_get_srv_inum,
1187 .set_path_size = CIFSSMBSetEOF,
1188 .set_file_size = CIFSSMBSetFileSize,
1189 .set_file_info = smb_set_file_info,
1190 .set_compression = cifs_set_compression,
1191 .echo = CIFSSMBEcho,
1192 .mkdir = CIFSSMBMkDir,
1193 .mkdir_setinfo = cifs_mkdir_setinfo,
1194 .rmdir = CIFSSMBRmDir,
1195 .unlink = CIFSSMBDelFile,
1196 .rename_pending_delete = cifs_rename_pending_delete,
1197 .rename = CIFSSMBRename,
1198 .create_hardlink = CIFSCreateHardLink,
1199 .query_symlink = cifs_query_symlink,
1200 .open = cifs_open_file,
1201 .set_fid = cifs_set_fid,
1202 .close = cifs_close_file,
1203 .flush = cifs_flush_file,
1204 .async_readv = cifs_async_readv,
1205 .async_writev = cifs_async_writev,
1206 .sync_read = cifs_sync_read,
1207 .sync_write = cifs_sync_write,
1208 .query_dir_first = cifs_query_dir_first,
1209 .query_dir_next = cifs_query_dir_next,
1210 .close_dir = cifs_close_dir,
1211 .calc_smb_size = smbCalcSize,
1212 .oplock_response = cifs_oplock_response,
1213 .queryfs = cifs_queryfs,
1214 .mand_lock = cifs_mand_lock,
1215 .mand_unlock_range = cifs_unlock_range,
1216 .push_mand_locks = cifs_push_mandatory_locks,
1217 .query_mf_symlink = cifs_query_mf_symlink,
1218 .create_mf_symlink = cifs_create_mf_symlink,
1219 .is_read_op = cifs_is_read_op,
1220 .wp_retry_size = cifs_wp_retry_size,
1221 .dir_needs_close = cifs_dir_needs_close,
1222 .select_sectype = cifs_select_sectype,
1223 #ifdef CONFIG_CIFS_XATTR
1224 .query_all_EAs = CIFSSMBQAllEAs,
1225 .set_EA = CIFSSMBSetEA,
1226 #endif /* CIFS_XATTR */
1227 .get_acl = get_cifs_acl,
1228 .get_acl_by_fid = get_cifs_acl_by_fid,
1229 .set_acl = set_cifs_acl,
1230 .make_node = cifs_make_node,
1233 struct smb_version_values smb1_values = {
1234 .version_string = SMB1_VERSION_STRING,
1235 .protocol_id = SMB10_PROT_ID,
1236 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1237 .exclusive_lock_type = 0,
1238 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1239 .unlock_lock_type = 0,
1240 .header_preamble_size = 4,
1241 .header_size = sizeof(struct smb_hdr),
1242 .max_header_size = MAX_CIFS_HDR_SIZE,
1243 .read_rsp_size = sizeof(READ_RSP),
1244 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1245 .cap_unix = CAP_UNIX,
1246 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1247 .cap_large_files = CAP_LARGE_FILES,
1248 .signing_enabled = SECMODE_SIGN_ENABLED,
1249 .signing_required = SECMODE_SIGN_REQUIRED,