4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
22 #include <linux/slab.h>
23 #include <linux/ctype.h>
24 #include <linux/mempool.h>
25 #include <linux/vmalloc.h>
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
32 #include "cifs_unicode.h"
35 #ifdef CONFIG_CIFS_DFS_UPCALL
36 #include "dns_resolve.h"
38 #include "fs_context.h"
40 extern mempool_t *cifs_sm_req_poolp;
41 extern mempool_t *cifs_req_poolp;
43 /* The xid serves as a useful identifier for each incoming vfs request,
44 in a similar way to the mid which is useful to track each sent smb,
45 and CurrentXid can also provide a running counter (although it
46 will eventually wrap past zero) of the total vfs operations handled
47 since the cifs fs was mounted */
54 spin_lock(&GlobalMid_Lock);
55 GlobalTotalActiveXid++;
57 /* keep high water mark for number of simultaneous ops in filesystem */
58 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
59 GlobalMaxActiveXid = GlobalTotalActiveXid;
60 if (GlobalTotalActiveXid > 65000)
61 cifs_dbg(FYI, "warning: more than 65000 requests active\n");
62 xid = GlobalCurrentXid++;
63 spin_unlock(&GlobalMid_Lock);
68 _free_xid(unsigned int xid)
70 spin_lock(&GlobalMid_Lock);
71 /* if (GlobalTotalActiveXid == 0)
73 GlobalTotalActiveXid--;
74 spin_unlock(&GlobalMid_Lock);
80 struct cifs_ses *ret_buf;
82 ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
84 atomic_inc(&sesInfoAllocCount);
85 ret_buf->status = CifsNew;
87 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
88 INIT_LIST_HEAD(&ret_buf->tcon_list);
89 mutex_init(&ret_buf->session_mutex);
90 spin_lock_init(&ret_buf->iface_lock);
96 sesInfoFree(struct cifs_ses *buf_to_free)
98 if (buf_to_free == NULL) {
99 cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
103 atomic_dec(&sesInfoAllocCount);
104 kfree(buf_to_free->serverOS);
105 kfree(buf_to_free->serverDomain);
106 kfree(buf_to_free->serverNOS);
107 kfree_sensitive(buf_to_free->password);
108 kfree(buf_to_free->user_name);
109 kfree(buf_to_free->domainName);
110 kfree_sensitive(buf_to_free->auth_key.response);
111 kfree(buf_to_free->iface_list);
112 kfree_sensitive(buf_to_free);
118 struct cifs_tcon *ret_buf;
120 ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL);
123 ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL);
124 if (!ret_buf->crfid.fid) {
129 atomic_inc(&tconInfoAllocCount);
130 ret_buf->tidStatus = CifsNew;
132 INIT_LIST_HEAD(&ret_buf->openFileList);
133 INIT_LIST_HEAD(&ret_buf->tcon_list);
134 spin_lock_init(&ret_buf->open_file_lock);
135 mutex_init(&ret_buf->crfid.fid_mutex);
136 spin_lock_init(&ret_buf->stat_lock);
137 atomic_set(&ret_buf->num_local_opens, 0);
138 atomic_set(&ret_buf->num_remote_opens, 0);
144 tconInfoFree(struct cifs_tcon *buf_to_free)
146 if (buf_to_free == NULL) {
147 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
150 atomic_dec(&tconInfoAllocCount);
151 kfree(buf_to_free->nativeFileSystem);
152 kfree_sensitive(buf_to_free->password);
153 kfree(buf_to_free->crfid.fid);
154 #ifdef CONFIG_CIFS_DFS_UPCALL
155 kfree(buf_to_free->dfs_path);
163 struct smb_hdr *ret_buf = NULL;
165 * SMB2 header is bigger than CIFS one - no problems to clean some
166 * more bytes for CIFS.
168 size_t buf_size = sizeof(struct smb2_sync_hdr);
171 * We could use negotiated size instead of max_msgsize -
172 * but it may be more efficient to always alloc same size
173 * albeit slightly larger than necessary and maxbuffersize
174 * defaults to this and can not be bigger.
176 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
178 /* clear the first few header bytes */
179 /* for most paths, more is cleared in header_assemble */
180 memset(ret_buf, 0, buf_size + 3);
181 atomic_inc(&bufAllocCount);
182 #ifdef CONFIG_CIFS_STATS2
183 atomic_inc(&totBufAllocCount);
184 #endif /* CONFIG_CIFS_STATS2 */
190 cifs_buf_release(void *buf_to_free)
192 if (buf_to_free == NULL) {
193 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
196 mempool_free(buf_to_free, cifs_req_poolp);
198 atomic_dec(&bufAllocCount);
203 cifs_small_buf_get(void)
205 struct smb_hdr *ret_buf = NULL;
207 /* We could use negotiated size instead of max_msgsize -
208 but it may be more efficient to always alloc same size
209 albeit slightly larger than necessary and maxbuffersize
210 defaults to this and can not be bigger */
211 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
212 /* No need to clear memory here, cleared in header assemble */
213 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
214 atomic_inc(&smBufAllocCount);
215 #ifdef CONFIG_CIFS_STATS2
216 atomic_inc(&totSmBufAllocCount);
217 #endif /* CONFIG_CIFS_STATS2 */
223 cifs_small_buf_release(void *buf_to_free)
226 if (buf_to_free == NULL) {
227 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
230 mempool_free(buf_to_free, cifs_sm_req_poolp);
232 atomic_dec(&smBufAllocCount);
237 free_rsp_buf(int resp_buftype, void *rsp)
239 if (resp_buftype == CIFS_SMALL_BUFFER)
240 cifs_small_buf_release(rsp);
241 else if (resp_buftype == CIFS_LARGE_BUFFER)
242 cifs_buf_release(rsp);
245 /* NB: MID can not be set if treeCon not passed in, in that
246 case it is responsbility of caller to set the mid */
248 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
249 const struct cifs_tcon *treeCon, int word_count
250 /* length of fixed section (word count) in two byte units */)
252 char *temp = (char *) buffer;
254 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
256 buffer->smb_buf_length = cpu_to_be32(
257 (2 * word_count) + sizeof(struct smb_hdr) -
258 4 /* RFC 1001 length field does not count */ +
259 2 /* for bcc field itself */) ;
261 buffer->Protocol[0] = 0xFF;
262 buffer->Protocol[1] = 'S';
263 buffer->Protocol[2] = 'M';
264 buffer->Protocol[3] = 'B';
265 buffer->Command = smb_command;
266 buffer->Flags = 0x00; /* case sensitive */
267 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
268 buffer->Pid = cpu_to_le16((__u16)current->tgid);
269 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
271 buffer->Tid = treeCon->tid;
273 if (treeCon->ses->capabilities & CAP_UNICODE)
274 buffer->Flags2 |= SMBFLG2_UNICODE;
275 if (treeCon->ses->capabilities & CAP_STATUS32)
276 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
278 /* Uid is not converted */
279 buffer->Uid = treeCon->ses->Suid;
280 buffer->Mid = get_next_mid(treeCon->ses->server);
282 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
283 buffer->Flags2 |= SMBFLG2_DFS;
285 buffer->Flags |= SMBFLG_CASELESS;
286 if ((treeCon->ses) && (treeCon->ses->server))
287 if (treeCon->ses->server->sign)
288 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
291 /* endian conversion of flags is now done just before sending */
292 buffer->WordCount = (char) word_count;
297 check_smb_hdr(struct smb_hdr *smb)
299 /* does it have the right SMB "signature" ? */
300 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
301 cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
302 *(unsigned int *)smb->Protocol);
306 /* if it's a response then accept */
307 if (smb->Flags & SMBFLG_RESPONSE)
310 /* only one valid case where server sends us request */
311 if (smb->Command == SMB_COM_LOCKING_ANDX)
314 cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
320 checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
322 struct smb_hdr *smb = (struct smb_hdr *)buf;
323 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
324 __u32 clc_len; /* calculated length */
325 cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
328 /* is this frame too small to even get to a BCC? */
329 if (total_read < 2 + sizeof(struct smb_hdr)) {
330 if ((total_read >= sizeof(struct smb_hdr) - 1)
331 && (smb->Status.CifsError != 0)) {
332 /* it's an error return */
334 /* some error cases do not return wct and bcc */
336 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
337 (smb->WordCount == 0)) {
338 char *tmp = (char *)smb;
339 /* Need to work around a bug in two servers here */
340 /* First, check if the part of bcc they sent was zero */
341 if (tmp[sizeof(struct smb_hdr)] == 0) {
342 /* some servers return only half of bcc
343 * on simple responses (wct, bcc both zero)
344 * in particular have seen this on
345 * ulogoffX and FindClose. This leaves
346 * one byte of bcc potentially unitialized
348 /* zero rest of bcc */
349 tmp[sizeof(struct smb_hdr)+1] = 0;
352 cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
354 cifs_dbg(VFS, "Length less than smb header size\n");
359 /* otherwise, there is enough to get to the BCC */
360 if (check_smb_hdr(smb))
362 clc_len = smbCalcSize(smb, server);
364 if (4 + rfclen != total_read) {
365 cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
370 if (4 + rfclen != clc_len) {
371 __u16 mid = get_mid(smb);
372 /* check if bcc wrapped around for large read responses */
373 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
374 /* check if lengths match mod 64K */
375 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
376 return 0; /* bcc wrapped */
378 cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
379 clc_len, 4 + rfclen, mid);
381 if (4 + rfclen < clc_len) {
382 cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
385 } else if (rfclen > clc_len + 512) {
387 * Some servers (Windows XP in particular) send more
388 * data than the lengths in the SMB packet would
389 * indicate on certain calls (byte range locks and
390 * trans2 find first calls in particular). While the
391 * client can handle such a frame by ignoring the
392 * trailing data, we choose limit the amount of extra
395 cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
404 is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
406 struct smb_hdr *buf = (struct smb_hdr *)buffer;
407 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
408 struct list_head *tmp, *tmp1, *tmp2;
409 struct cifs_ses *ses;
410 struct cifs_tcon *tcon;
411 struct cifsInodeInfo *pCifsInode;
412 struct cifsFileInfo *netfile;
414 cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
415 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
416 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
417 struct smb_com_transaction_change_notify_rsp *pSMBr =
418 (struct smb_com_transaction_change_notify_rsp *)buf;
419 struct file_notify_information *pnotify;
420 __u32 data_offset = 0;
421 size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length);
423 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
424 data_offset = le32_to_cpu(pSMBr->DataOffset);
427 len - sizeof(struct file_notify_information)) {
428 cifs_dbg(FYI, "Invalid data_offset %u\n",
432 pnotify = (struct file_notify_information *)
433 ((char *)&pSMBr->hdr.Protocol + data_offset);
434 cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
435 pnotify->FileName, pnotify->Action);
436 /* cifs_dump_mem("Rcvd notify Data: ",buf,
437 sizeof(struct smb_hdr)+60); */
440 if (pSMBr->hdr.Status.CifsError) {
441 cifs_dbg(FYI, "notify err 0x%x\n",
442 pSMBr->hdr.Status.CifsError);
447 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
449 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
450 /* no sense logging error on invalid handle on oplock
451 break - harmless race between close request and oplock
452 break response is expected from time to time writing out
453 large dirty files cached on the client */
454 if ((NT_STATUS_INVALID_HANDLE) ==
455 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
456 cifs_dbg(FYI, "Invalid handle on oplock break\n");
458 } else if (ERRbadfid ==
459 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
462 return false; /* on valid oplock brk we get "request" */
465 if (pSMB->hdr.WordCount != 8)
468 cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
469 pSMB->LockType, pSMB->OplockLevel);
470 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
473 /* look up tcon based on tid & uid */
474 spin_lock(&cifs_tcp_ses_lock);
475 list_for_each(tmp, &srv->smb_ses_list) {
476 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
477 list_for_each(tmp1, &ses->tcon_list) {
478 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
479 if (tcon->tid != buf->Tid)
482 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
483 spin_lock(&tcon->open_file_lock);
484 list_for_each(tmp2, &tcon->openFileList) {
485 netfile = list_entry(tmp2, struct cifsFileInfo,
487 if (pSMB->Fid != netfile->fid.netfid)
490 cifs_dbg(FYI, "file id match, oplock break\n");
491 pCifsInode = CIFS_I(d_inode(netfile->dentry));
493 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
496 netfile->oplock_epoch = 0;
497 netfile->oplock_level = pSMB->OplockLevel;
498 netfile->oplock_break_cancelled = false;
499 cifs_queue_oplock_break(netfile);
501 spin_unlock(&tcon->open_file_lock);
502 spin_unlock(&cifs_tcp_ses_lock);
505 spin_unlock(&tcon->open_file_lock);
506 spin_unlock(&cifs_tcp_ses_lock);
507 cifs_dbg(FYI, "No matching file for oplock break\n");
511 spin_unlock(&cifs_tcp_ses_lock);
512 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
517 dump_smb(void *buf, int smb_buf_length)
522 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
523 smb_buf_length, true);
527 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
529 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
530 struct cifs_tcon *tcon = NULL;
532 if (cifs_sb->master_tlink)
533 tcon = cifs_sb_master_tcon(cifs_sb);
535 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
536 cifs_sb->mnt_cifs_serverino_autodisabled = true;
537 cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n",
538 tcon ? tcon->treeName : "new server");
539 cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n");
540 cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n");
545 void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
549 if (oplock == OPLOCK_EXCLUSIVE) {
550 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
551 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
553 } else if (oplock == OPLOCK_READ) {
554 cinode->oplock = CIFS_CACHE_READ_FLG;
555 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
562 * We wait for oplock breaks to be processed before we attempt to perform
565 int cifs_get_writer(struct cifsInodeInfo *cinode)
570 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
575 spin_lock(&cinode->writers_lock);
576 if (!cinode->writers)
577 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
579 /* Check to see if we have started servicing an oplock break */
580 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
582 if (cinode->writers == 0) {
583 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
584 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
586 spin_unlock(&cinode->writers_lock);
589 spin_unlock(&cinode->writers_lock);
593 void cifs_put_writer(struct cifsInodeInfo *cinode)
595 spin_lock(&cinode->writers_lock);
597 if (cinode->writers == 0) {
598 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
599 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
601 spin_unlock(&cinode->writers_lock);
605 * cifs_queue_oplock_break - queue the oplock break handler for cfile
607 * This function is called from the demultiplex thread when it
608 * receives an oplock break for @cfile.
610 * Assumes the tcon->open_file_lock is held.
611 * Assumes cfile->file_info_lock is NOT held.
613 void cifs_queue_oplock_break(struct cifsFileInfo *cfile)
616 * Bump the handle refcount now while we hold the
617 * open_file_lock to enforce the validity of it for the oplock
618 * break handler. The matching put is done at the end of the
621 cifsFileInfo_get(cfile);
623 queue_work(cifsoplockd_wq, &cfile->oplock_break);
626 void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
628 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
629 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
633 backup_cred(struct cifs_sb_info *cifs_sb)
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
636 if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid()))
639 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
640 if (in_group_p(cifs_sb->ctx->backupgid))
648 cifs_del_pending_open(struct cifs_pending_open *open)
650 spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
651 list_del(&open->olist);
652 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
656 cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
657 struct cifs_pending_open *open)
659 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
660 open->oplock = CIFS_OPLOCK_NO_CHANGE;
662 fid->pending_open = open;
663 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
667 cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
668 struct cifs_pending_open *open)
670 spin_lock(&tlink_tcon(tlink)->open_file_lock);
671 cifs_add_pending_open_locked(fid, tlink, open);
672 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
676 * Critical section which runs after acquiring deferred_lock.
677 * As there is no reference count on cifs_deferred_close, pdclose
678 * should not be used outside deferred_lock.
681 cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose)
683 struct cifs_deferred_close *dclose;
685 list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) {
686 if ((dclose->netfid == cfile->fid.netfid) &&
687 (dclose->persistent_fid == cfile->fid.persistent_fid) &&
688 (dclose->volatile_fid == cfile->fid.volatile_fid)) {
697 * Critical section which runs after acquiring deferred_lock.
700 cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose)
702 bool is_deferred = false;
703 struct cifs_deferred_close *pdclose;
705 is_deferred = cifs_is_deferred_close(cfile, &pdclose);
711 dclose->tlink = cfile->tlink;
712 dclose->netfid = cfile->fid.netfid;
713 dclose->persistent_fid = cfile->fid.persistent_fid;
714 dclose->volatile_fid = cfile->fid.volatile_fid;
715 list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes);
719 * Critical section which runs after acquiring deferred_lock.
722 cifs_del_deferred_close(struct cifsFileInfo *cfile)
724 bool is_deferred = false;
725 struct cifs_deferred_close *dclose;
727 is_deferred = cifs_is_deferred_close(cfile, &dclose);
730 list_del(&dclose->dlist);
735 cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
737 struct cifsFileInfo *cfile = NULL;
738 struct file_list *tmp_list, *tmp_next_list;
739 struct list_head file_head;
741 if (cifs_inode == NULL)
744 INIT_LIST_HEAD(&file_head);
745 spin_lock(&cifs_inode->open_file_lock);
746 list_for_each_entry(cfile, &cifs_inode->openFileList, flist) {
747 if (delayed_work_pending(&cfile->deferred)) {
748 if (cancel_delayed_work(&cfile->deferred)) {
749 tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
750 if (tmp_list == NULL)
752 tmp_list->cfile = cfile;
753 list_add_tail(&tmp_list->list, &file_head);
757 spin_unlock(&cifs_inode->open_file_lock);
759 list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
760 _cifsFileInfo_put(tmp_list->cfile, true, false);
761 list_del(&tmp_list->list);
767 cifs_close_all_deferred_files(struct cifs_tcon *tcon)
769 struct cifsFileInfo *cfile;
770 struct list_head *tmp;
771 struct file_list *tmp_list, *tmp_next_list;
772 struct list_head file_head;
774 INIT_LIST_HEAD(&file_head);
775 spin_lock(&tcon->open_file_lock);
776 list_for_each(tmp, &tcon->openFileList) {
777 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
778 if (delayed_work_pending(&cfile->deferred)) {
779 if (cancel_delayed_work(&cfile->deferred)) {
780 tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
781 if (tmp_list == NULL)
783 tmp_list->cfile = cfile;
784 list_add_tail(&tmp_list->list, &file_head);
788 spin_unlock(&tcon->open_file_lock);
790 list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
791 _cifsFileInfo_put(tmp_list->cfile, true, false);
792 list_del(&tmp_list->list);
797 /* parses DFS refferal V3 structure
798 * caller is responsible for freeing target_nodes
801 * - on failure - errno
804 parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
805 unsigned int *num_of_nodes,
806 struct dfs_info3_param **target_nodes,
807 const struct nls_table *nls_codepage, int remap,
808 const char *searchName, bool is_unicode)
812 struct dfs_referral_level_3 *ref;
814 *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
816 if (*num_of_nodes < 1) {
817 cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
820 goto parse_DFS_referrals_exit;
823 ref = (struct dfs_referral_level_3 *) &(rsp->referrals);
824 if (ref->VersionNumber != cpu_to_le16(3)) {
825 cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
826 le16_to_cpu(ref->VersionNumber));
828 goto parse_DFS_referrals_exit;
831 /* get the upper boundary of the resp buffer */
832 data_end = (char *)rsp + rsp_size;
834 cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
835 *num_of_nodes, le32_to_cpu(rsp->DFSFlags));
837 *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
839 if (*target_nodes == NULL) {
841 goto parse_DFS_referrals_exit;
844 /* collect necessary data from referrals */
845 for (i = 0; i < *num_of_nodes; i++) {
848 struct dfs_info3_param *node = (*target_nodes)+i;
850 node->flags = le32_to_cpu(rsp->DFSFlags);
852 __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
856 goto parse_DFS_referrals_exit;
858 cifsConvertToUTF16((__le16 *) tmp, searchName,
859 PATH_MAX, nls_codepage, remap);
860 node->path_consumed = cifs_utf16_bytes(tmp,
861 le16_to_cpu(rsp->PathConsumed),
865 node->path_consumed = le16_to_cpu(rsp->PathConsumed);
867 node->server_type = le16_to_cpu(ref->ServerType);
868 node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
871 temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
872 max_len = data_end - temp;
873 node->path_name = cifs_strndup_from_utf16(temp, max_len,
874 is_unicode, nls_codepage);
875 if (!node->path_name) {
877 goto parse_DFS_referrals_exit;
880 /* copy link target UNC */
881 temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
882 max_len = data_end - temp;
883 node->node_name = cifs_strndup_from_utf16(temp, max_len,
884 is_unicode, nls_codepage);
885 if (!node->node_name) {
887 goto parse_DFS_referrals_exit;
890 node->ttl = le32_to_cpu(ref->TimeToLive);
895 parse_DFS_referrals_exit:
897 free_dfs_info_array(*target_nodes, *num_of_nodes);
898 *target_nodes = NULL;
904 struct cifs_aio_ctx *
905 cifs_aio_ctx_alloc(void)
907 struct cifs_aio_ctx *ctx;
910 * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
911 * to false so that we know when we have to unreference pages within
912 * cifs_aio_ctx_release()
914 ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
918 INIT_LIST_HEAD(&ctx->list);
919 mutex_init(&ctx->aio_mutex);
920 init_completion(&ctx->done);
921 kref_init(&ctx->refcount);
926 cifs_aio_ctx_release(struct kref *refcount)
928 struct cifs_aio_ctx *ctx = container_of(refcount,
929 struct cifs_aio_ctx, refcount);
931 cifsFileInfo_put(ctx->cfile);
934 * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
935 * which means that iov_iter_get_pages() was a success and thus that
936 * we have taken reference on pages.
941 for (i = 0; i < ctx->npages; i++) {
942 if (ctx->should_dirty)
943 set_page_dirty(ctx->bv[i].bv_page);
944 put_page(ctx->bv[i].bv_page);
952 #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
955 setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
958 unsigned int cur_npages;
959 unsigned int npages = 0;
962 size_t count = iov_iter_count(iter);
963 unsigned int saved_len;
965 unsigned int max_pages = iov_iter_npages(iter, INT_MAX);
966 struct page **pages = NULL;
967 struct bio_vec *bv = NULL;
969 if (iov_iter_is_kvec(iter)) {
970 memcpy(&ctx->iter, iter, sizeof(*iter));
972 iov_iter_advance(iter, count);
976 if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT)
977 bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL);
980 bv = vmalloc(array_size(max_pages, sizeof(*bv)));
985 if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT)
986 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
989 pages = vmalloc(array_size(max_pages, sizeof(*pages)));
998 while (count && npages < max_pages) {
999 rc = iov_iter_get_pages(iter, pages, count, max_pages, &start);
1001 cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc);
1006 cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc,
1011 iov_iter_advance(iter, rc);
1014 cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE);
1016 if (npages + cur_npages > max_pages) {
1017 cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n",
1018 npages + cur_npages, max_pages);
1022 for (i = 0; i < cur_npages; i++) {
1023 len = rc > PAGE_SIZE ? PAGE_SIZE : rc;
1024 bv[npages + i].bv_page = pages[i];
1025 bv[npages + i].bv_offset = start;
1026 bv[npages + i].bv_len = len - start;
1031 npages += cur_npages;
1036 ctx->len = saved_len - count;
1037 ctx->npages = npages;
1038 iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len);
1043 * cifs_alloc_hash - allocate hash and hash context together
1045 * The caller has to make sure @sdesc is initialized to either NULL or
1046 * a valid context. Both can be freed via cifs_free_hash().
1049 cifs_alloc_hash(const char *name,
1050 struct crypto_shash **shash, struct sdesc **sdesc)
1058 *shash = crypto_alloc_shash(name, 0, 0);
1059 if (IS_ERR(*shash)) {
1060 cifs_dbg(VFS, "Could not allocate crypto %s\n", name);
1061 rc = PTR_ERR(*shash);
1067 size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash);
1068 *sdesc = kmalloc(size, GFP_KERNEL);
1069 if (*sdesc == NULL) {
1070 cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name);
1071 crypto_free_shash(*shash);
1076 (*sdesc)->shash.tfm = *shash;
1081 * cifs_free_hash - free hash and hash context together
1083 * Freeing a NULL hash or context is safe.
1086 cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc)
1091 crypto_free_shash(*shash);
1096 * rqst_page_get_length - obtain the length and offset for a page in smb_rqst
1097 * Input: rqst - a smb_rqst, page - a page index for rqst
1098 * Output: *len - the length for this page, *offset - the offset for this page
1100 void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page,
1101 unsigned int *len, unsigned int *offset)
1103 *len = rqst->rq_pagesz;
1104 *offset = (page == 0) ? rqst->rq_offset : 0;
1106 if (rqst->rq_npages == 1 || page == rqst->rq_npages-1)
1107 *len = rqst->rq_tailsz;
1109 *len = rqst->rq_pagesz - rqst->rq_offset;
1112 void extract_unc_hostname(const char *unc, const char **h, size_t *len)
1116 /* skip initial slashes */
1117 while (*unc && (*unc == '\\' || *unc == '/'))
1122 while (*end && !(*end == '\\' || *end == '/'))
1130 * copy_path_name - copy src path to dst, possibly truncating
1132 * returns number of bytes written (including trailing nul)
1134 int copy_path_name(char *dst, const char *src)
1139 * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it
1140 * will truncate and strlen(dst) will be PATH_MAX-1
1142 name_len = strscpy(dst, src, PATH_MAX);
1143 if (WARN_ON_ONCE(name_len < 0))
1144 name_len = PATH_MAX-1;
1146 /* we count the trailing nul */
1151 struct super_cb_data {
1153 struct super_block *sb;
1156 static void tcp_super_cb(struct super_block *sb, void *arg)
1158 struct super_cb_data *sd = arg;
1159 struct TCP_Server_Info *server = sd->data;
1160 struct cifs_sb_info *cifs_sb;
1161 struct cifs_tcon *tcon;
1166 cifs_sb = CIFS_SB(sb);
1167 tcon = cifs_sb_master_tcon(cifs_sb);
1168 if (tcon->ses->server == server)
1172 static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *),
1175 struct super_cb_data sd = {
1180 iterate_supers_type(&cifs_fs_type, f, &sd);
1183 return ERR_PTR(-EINVAL);
1185 * Grab an active reference in order to prevent automounts (DFS links)
1186 * of expiring and then freeing up our cifs superblock pointer while
1187 * we're doing failover.
1189 cifs_sb_active(sd.sb);
1193 static void __cifs_put_super(struct super_block *sb)
1195 if (!IS_ERR_OR_NULL(sb))
1196 cifs_sb_deactive(sb);
1199 struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server)
1201 return __cifs_get_super(tcp_super_cb, server);
1204 void cifs_put_tcp_super(struct super_block *sb)
1206 __cifs_put_super(sb);
1209 #ifdef CONFIG_CIFS_DFS_UPCALL
1210 int match_target_ip(struct TCP_Server_Info *server,
1211 const char *share, size_t share_len,
1215 char *target, *tip = NULL;
1216 struct sockaddr tipaddr;
1220 target = kzalloc(share_len + 3, GFP_KERNEL);
1226 scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share);
1228 cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2);
1230 rc = dns_resolve_server_name_to_ip(target, &tip, NULL);
1234 cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip);
1236 if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) {
1237 cifs_dbg(VFS, "%s: failed to convert target ip address\n",
1243 *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr,
1245 cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result);
1255 static void tcon_super_cb(struct super_block *sb, void *arg)
1257 struct super_cb_data *sd = arg;
1258 struct cifs_tcon *tcon = sd->data;
1259 struct cifs_sb_info *cifs_sb;
1264 cifs_sb = CIFS_SB(sb);
1265 if (tcon->dfs_path && cifs_sb->origin_fullpath &&
1266 !strcasecmp(tcon->dfs_path, cifs_sb->origin_fullpath))
1270 static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon)
1272 return __cifs_get_super(tcon_super_cb, tcon);
1275 static inline void cifs_put_tcon_super(struct super_block *sb)
1277 __cifs_put_super(sb);
1280 static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon)
1282 return ERR_PTR(-EOPNOTSUPP);
1285 static inline void cifs_put_tcon_super(struct super_block *sb)
1290 int update_super_prepath(struct cifs_tcon *tcon, char *prefix)
1292 struct super_block *sb;
1293 struct cifs_sb_info *cifs_sb;
1296 sb = cifs_get_tcon_super(tcon);
1300 cifs_sb = CIFS_SB(sb);
1302 kfree(cifs_sb->prepath);
1304 if (prefix && *prefix) {
1305 cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
1306 if (!cifs_sb->prepath) {
1311 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
1313 cifs_sb->prepath = NULL;
1315 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
1318 cifs_put_tcon_super(sb);