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 extern mempool_t *cifs_sm_req_poolp;
36 extern mempool_t *cifs_req_poolp;
38 /* The xid serves as a useful identifier for each incoming vfs request,
39 in a similar way to the mid which is useful to track each sent smb,
40 and CurrentXid can also provide a running counter (although it
41 will eventually wrap past zero) of the total vfs operations handled
42 since the cifs fs was mounted */
49 spin_lock(&GlobalMid_Lock);
50 GlobalTotalActiveXid++;
52 /* keep high water mark for number of simultaneous ops in filesystem */
53 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
54 GlobalMaxActiveXid = GlobalTotalActiveXid;
55 if (GlobalTotalActiveXid > 65000)
56 cifs_dbg(FYI, "warning: more than 65000 requests active\n");
57 xid = GlobalCurrentXid++;
58 spin_unlock(&GlobalMid_Lock);
63 _free_xid(unsigned int xid)
65 spin_lock(&GlobalMid_Lock);
66 /* if (GlobalTotalActiveXid == 0)
68 GlobalTotalActiveXid--;
69 spin_unlock(&GlobalMid_Lock);
75 struct cifs_ses *ret_buf;
77 ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
79 atomic_inc(&sesInfoAllocCount);
80 ret_buf->status = CifsNew;
82 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
83 INIT_LIST_HEAD(&ret_buf->tcon_list);
84 mutex_init(&ret_buf->session_mutex);
90 sesInfoFree(struct cifs_ses *buf_to_free)
92 if (buf_to_free == NULL) {
93 cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
97 atomic_dec(&sesInfoAllocCount);
98 kfree(buf_to_free->serverOS);
99 kfree(buf_to_free->serverDomain);
100 kfree(buf_to_free->serverNOS);
101 kzfree(buf_to_free->password);
102 kfree(buf_to_free->user_name);
103 kfree(buf_to_free->domainName);
104 kzfree(buf_to_free->auth_key.response);
111 struct cifs_tcon *ret_buf;
112 ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
114 atomic_inc(&tconInfoAllocCount);
115 ret_buf->tidStatus = CifsNew;
117 INIT_LIST_HEAD(&ret_buf->openFileList);
118 INIT_LIST_HEAD(&ret_buf->tcon_list);
119 spin_lock_init(&ret_buf->open_file_lock);
120 #ifdef CONFIG_CIFS_STATS
121 spin_lock_init(&ret_buf->stat_lock);
128 tconInfoFree(struct cifs_tcon *buf_to_free)
130 if (buf_to_free == NULL) {
131 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
134 atomic_dec(&tconInfoAllocCount);
135 kfree(buf_to_free->nativeFileSystem);
136 kzfree(buf_to_free->password);
143 struct smb_hdr *ret_buf = NULL;
145 * SMB2 header is bigger than CIFS one - no problems to clean some
146 * more bytes for CIFS.
148 size_t buf_size = sizeof(struct smb2_hdr);
151 * We could use negotiated size instead of max_msgsize -
152 * but it may be more efficient to always alloc same size
153 * albeit slightly larger than necessary and maxbuffersize
154 * defaults to this and can not be bigger.
156 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
158 /* clear the first few header bytes */
159 /* for most paths, more is cleared in header_assemble */
160 memset(ret_buf, 0, buf_size + 3);
161 atomic_inc(&bufAllocCount);
162 #ifdef CONFIG_CIFS_STATS2
163 atomic_inc(&totBufAllocCount);
164 #endif /* CONFIG_CIFS_STATS2 */
170 cifs_buf_release(void *buf_to_free)
172 if (buf_to_free == NULL) {
173 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
176 mempool_free(buf_to_free, cifs_req_poolp);
178 atomic_dec(&bufAllocCount);
183 cifs_small_buf_get(void)
185 struct smb_hdr *ret_buf = NULL;
187 /* We could use negotiated size instead of max_msgsize -
188 but it may be more efficient to always alloc same size
189 albeit slightly larger than necessary and maxbuffersize
190 defaults to this and can not be bigger */
191 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
192 /* No need to clear memory here, cleared in header assemble */
193 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
194 atomic_inc(&smBufAllocCount);
195 #ifdef CONFIG_CIFS_STATS2
196 atomic_inc(&totSmBufAllocCount);
197 #endif /* CONFIG_CIFS_STATS2 */
203 cifs_small_buf_release(void *buf_to_free)
206 if (buf_to_free == NULL) {
207 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
210 mempool_free(buf_to_free, cifs_sm_req_poolp);
212 atomic_dec(&smBufAllocCount);
217 free_rsp_buf(int resp_buftype, void *rsp)
219 if (resp_buftype == CIFS_SMALL_BUFFER)
220 cifs_small_buf_release(rsp);
221 else if (resp_buftype == CIFS_LARGE_BUFFER)
222 cifs_buf_release(rsp);
225 /* NB: MID can not be set if treeCon not passed in, in that
226 case it is responsbility of caller to set the mid */
228 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
229 const struct cifs_tcon *treeCon, int word_count
230 /* length of fixed section (word count) in two byte units */)
232 char *temp = (char *) buffer;
234 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
236 buffer->smb_buf_length = cpu_to_be32(
237 (2 * word_count) + sizeof(struct smb_hdr) -
238 4 /* RFC 1001 length field does not count */ +
239 2 /* for bcc field itself */) ;
241 buffer->Protocol[0] = 0xFF;
242 buffer->Protocol[1] = 'S';
243 buffer->Protocol[2] = 'M';
244 buffer->Protocol[3] = 'B';
245 buffer->Command = smb_command;
246 buffer->Flags = 0x00; /* case sensitive */
247 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
248 buffer->Pid = cpu_to_le16((__u16)current->tgid);
249 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
251 buffer->Tid = treeCon->tid;
253 if (treeCon->ses->capabilities & CAP_UNICODE)
254 buffer->Flags2 |= SMBFLG2_UNICODE;
255 if (treeCon->ses->capabilities & CAP_STATUS32)
256 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
258 /* Uid is not converted */
259 buffer->Uid = treeCon->ses->Suid;
260 buffer->Mid = get_next_mid(treeCon->ses->server);
262 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
263 buffer->Flags2 |= SMBFLG2_DFS;
265 buffer->Flags |= SMBFLG_CASELESS;
266 if ((treeCon->ses) && (treeCon->ses->server))
267 if (treeCon->ses->server->sign)
268 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
271 /* endian conversion of flags is now done just before sending */
272 buffer->WordCount = (char) word_count;
277 check_smb_hdr(struct smb_hdr *smb)
279 /* does it have the right SMB "signature" ? */
280 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
281 cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
282 *(unsigned int *)smb->Protocol);
286 /* if it's a response then accept */
287 if (smb->Flags & SMBFLG_RESPONSE)
290 /* only one valid case where server sends us request */
291 if (smb->Command == SMB_COM_LOCKING_ANDX)
294 cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
300 checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
302 struct smb_hdr *smb = (struct smb_hdr *)buf;
303 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
304 __u32 clc_len; /* calculated length */
305 cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
308 /* is this frame too small to even get to a BCC? */
309 if (total_read < 2 + sizeof(struct smb_hdr)) {
310 if ((total_read >= sizeof(struct smb_hdr) - 1)
311 && (smb->Status.CifsError != 0)) {
312 /* it's an error return */
314 /* some error cases do not return wct and bcc */
316 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
317 (smb->WordCount == 0)) {
318 char *tmp = (char *)smb;
319 /* Need to work around a bug in two servers here */
320 /* First, check if the part of bcc they sent was zero */
321 if (tmp[sizeof(struct smb_hdr)] == 0) {
322 /* some servers return only half of bcc
323 * on simple responses (wct, bcc both zero)
324 * in particular have seen this on
325 * ulogoffX and FindClose. This leaves
326 * one byte of bcc potentially unitialized
328 /* zero rest of bcc */
329 tmp[sizeof(struct smb_hdr)+1] = 0;
332 cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
334 cifs_dbg(VFS, "Length less than smb header size\n");
339 /* otherwise, there is enough to get to the BCC */
340 if (check_smb_hdr(smb))
342 clc_len = smbCalcSize(smb);
344 if (4 + rfclen != total_read) {
345 cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
350 if (4 + rfclen != clc_len) {
351 __u16 mid = get_mid(smb);
352 /* check if bcc wrapped around for large read responses */
353 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
354 /* check if lengths match mod 64K */
355 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
356 return 0; /* bcc wrapped */
358 cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
359 clc_len, 4 + rfclen, mid);
361 if (4 + rfclen < clc_len) {
362 cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
365 } else if (rfclen > clc_len + 512) {
367 * Some servers (Windows XP in particular) send more
368 * data than the lengths in the SMB packet would
369 * indicate on certain calls (byte range locks and
370 * trans2 find first calls in particular). While the
371 * client can handle such a frame by ignoring the
372 * trailing data, we choose limit the amount of extra
375 cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
384 is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
386 struct smb_hdr *buf = (struct smb_hdr *)buffer;
387 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
388 struct list_head *tmp, *tmp1, *tmp2;
389 struct cifs_ses *ses;
390 struct cifs_tcon *tcon;
391 struct cifsInodeInfo *pCifsInode;
392 struct cifsFileInfo *netfile;
394 cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
395 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
396 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
397 struct smb_com_transaction_change_notify_rsp *pSMBr =
398 (struct smb_com_transaction_change_notify_rsp *)buf;
399 struct file_notify_information *pnotify;
400 __u32 data_offset = 0;
401 size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length);
403 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
404 data_offset = le32_to_cpu(pSMBr->DataOffset);
407 len - sizeof(struct file_notify_information)) {
408 cifs_dbg(FYI, "invalid data_offset %u\n",
412 pnotify = (struct file_notify_information *)
413 ((char *)&pSMBr->hdr.Protocol + data_offset);
414 cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
415 pnotify->FileName, pnotify->Action);
416 /* cifs_dump_mem("Rcvd notify Data: ",buf,
417 sizeof(struct smb_hdr)+60); */
420 if (pSMBr->hdr.Status.CifsError) {
421 cifs_dbg(FYI, "notify err 0x%x\n",
422 pSMBr->hdr.Status.CifsError);
427 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
429 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
430 /* no sense logging error on invalid handle on oplock
431 break - harmless race between close request and oplock
432 break response is expected from time to time writing out
433 large dirty files cached on the client */
434 if ((NT_STATUS_INVALID_HANDLE) ==
435 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
436 cifs_dbg(FYI, "invalid handle on oplock break\n");
438 } else if (ERRbadfid ==
439 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
442 return false; /* on valid oplock brk we get "request" */
445 if (pSMB->hdr.WordCount != 8)
448 cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
449 pSMB->LockType, pSMB->OplockLevel);
450 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
453 /* look up tcon based on tid & uid */
454 spin_lock(&cifs_tcp_ses_lock);
455 list_for_each(tmp, &srv->smb_ses_list) {
456 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
457 list_for_each(tmp1, &ses->tcon_list) {
458 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
459 if (tcon->tid != buf->Tid)
462 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
463 spin_lock(&tcon->open_file_lock);
464 list_for_each(tmp2, &tcon->openFileList) {
465 netfile = list_entry(tmp2, struct cifsFileInfo,
467 if (pSMB->Fid != netfile->fid.netfid)
470 cifs_dbg(FYI, "file id match, oplock break\n");
471 pCifsInode = CIFS_I(d_inode(netfile->dentry));
473 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
476 netfile->oplock_epoch = 0;
477 netfile->oplock_level = pSMB->OplockLevel;
478 netfile->oplock_break_cancelled = false;
479 cifs_queue_oplock_break(netfile);
481 spin_unlock(&tcon->open_file_lock);
482 spin_unlock(&cifs_tcp_ses_lock);
485 spin_unlock(&tcon->open_file_lock);
486 spin_unlock(&cifs_tcp_ses_lock);
487 cifs_dbg(FYI, "No matching file for oplock break\n");
491 spin_unlock(&cifs_tcp_ses_lock);
492 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
497 dump_smb(void *buf, int smb_buf_length)
502 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
503 smb_buf_length, true);
507 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
509 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
510 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
511 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",
512 cifs_sb_master_tcon(cifs_sb)->treeName);
516 void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
520 if (oplock == OPLOCK_EXCLUSIVE) {
521 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
522 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
524 } else if (oplock == OPLOCK_READ) {
525 cinode->oplock = CIFS_CACHE_READ_FLG;
526 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
533 * We wait for oplock breaks to be processed before we attempt to perform
536 int cifs_get_writer(struct cifsInodeInfo *cinode)
541 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
546 spin_lock(&cinode->writers_lock);
547 if (!cinode->writers)
548 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
550 /* Check to see if we have started servicing an oplock break */
551 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
553 if (cinode->writers == 0) {
554 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
555 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
557 spin_unlock(&cinode->writers_lock);
560 spin_unlock(&cinode->writers_lock);
564 void cifs_put_writer(struct cifsInodeInfo *cinode)
566 spin_lock(&cinode->writers_lock);
568 if (cinode->writers == 0) {
569 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
570 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
572 spin_unlock(&cinode->writers_lock);
576 * cifs_queue_oplock_break - queue the oplock break handler for cfile
578 * This function is called from the demultiplex thread when it
579 * receives an oplock break for @cfile.
581 * Assumes the tcon->open_file_lock is held.
582 * Assumes cfile->file_info_lock is NOT held.
584 void cifs_queue_oplock_break(struct cifsFileInfo *cfile)
587 * Bump the handle refcount now while we hold the
588 * open_file_lock to enforce the validity of it for the oplock
589 * break handler. The matching put is done at the end of the
592 cifsFileInfo_get(cfile);
594 queue_work(cifsoplockd_wq, &cfile->oplock_break);
597 void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
599 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
600 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
604 backup_cred(struct cifs_sb_info *cifs_sb)
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
607 if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid()))
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
611 if (in_group_p(cifs_sb->mnt_backupgid))
619 cifs_del_pending_open(struct cifs_pending_open *open)
621 spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
622 list_del(&open->olist);
623 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
627 cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
628 struct cifs_pending_open *open)
630 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
631 open->oplock = CIFS_OPLOCK_NO_CHANGE;
633 fid->pending_open = open;
634 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
638 cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
639 struct cifs_pending_open *open)
641 spin_lock(&tlink_tcon(tlink)->open_file_lock);
642 cifs_add_pending_open_locked(fid, tlink, open);
643 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
646 /* parses DFS refferal V3 structure
647 * caller is responsible for freeing target_nodes
650 * - on failure - errno
653 parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
654 unsigned int *num_of_nodes,
655 struct dfs_info3_param **target_nodes,
656 const struct nls_table *nls_codepage, int remap,
657 const char *searchName, bool is_unicode)
661 struct dfs_referral_level_3 *ref;
663 *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
665 if (*num_of_nodes < 1) {
666 cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
669 goto parse_DFS_referrals_exit;
672 ref = (struct dfs_referral_level_3 *) &(rsp->referrals);
673 if (ref->VersionNumber != cpu_to_le16(3)) {
674 cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
675 le16_to_cpu(ref->VersionNumber));
677 goto parse_DFS_referrals_exit;
680 /* get the upper boundary of the resp buffer */
681 data_end = (char *)rsp + rsp_size;
683 cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
684 *num_of_nodes, le32_to_cpu(rsp->DFSFlags));
686 *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
688 if (*target_nodes == NULL) {
690 goto parse_DFS_referrals_exit;
693 /* collect necessary data from referrals */
694 for (i = 0; i < *num_of_nodes; i++) {
697 struct dfs_info3_param *node = (*target_nodes)+i;
699 node->flags = le32_to_cpu(rsp->DFSFlags);
701 __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
705 goto parse_DFS_referrals_exit;
707 cifsConvertToUTF16((__le16 *) tmp, searchName,
708 PATH_MAX, nls_codepage, remap);
709 node->path_consumed = cifs_utf16_bytes(tmp,
710 le16_to_cpu(rsp->PathConsumed),
714 node->path_consumed = le16_to_cpu(rsp->PathConsumed);
716 node->server_type = le16_to_cpu(ref->ServerType);
717 node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
720 temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
721 max_len = data_end - temp;
722 node->path_name = cifs_strndup_from_utf16(temp, max_len,
723 is_unicode, nls_codepage);
724 if (!node->path_name) {
726 goto parse_DFS_referrals_exit;
729 /* copy link target UNC */
730 temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
731 max_len = data_end - temp;
732 node->node_name = cifs_strndup_from_utf16(temp, max_len,
733 is_unicode, nls_codepage);
734 if (!node->node_name) {
736 goto parse_DFS_referrals_exit;
742 parse_DFS_referrals_exit:
744 free_dfs_info_array(*target_nodes, *num_of_nodes);
745 *target_nodes = NULL;
751 struct cifs_aio_ctx *
752 cifs_aio_ctx_alloc(void)
754 struct cifs_aio_ctx *ctx;
756 ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
760 INIT_LIST_HEAD(&ctx->list);
761 mutex_init(&ctx->aio_mutex);
762 init_completion(&ctx->done);
763 kref_init(&ctx->refcount);
768 cifs_aio_ctx_release(struct kref *refcount)
770 struct cifs_aio_ctx *ctx = container_of(refcount,
771 struct cifs_aio_ctx, refcount);
773 cifsFileInfo_put(ctx->cfile);
778 #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024)
781 setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
784 unsigned int cur_npages;
785 unsigned int npages = 0;
788 size_t count = iov_iter_count(iter);
789 unsigned int saved_len;
791 unsigned int max_pages = iov_iter_npages(iter, INT_MAX);
792 struct page **pages = NULL;
793 struct bio_vec *bv = NULL;
795 if (iter->type & ITER_KVEC) {
796 memcpy(&ctx->iter, iter, sizeof(struct iov_iter));
798 iov_iter_advance(iter, count);
802 if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT)
803 bv = kmalloc_array(max_pages, sizeof(struct bio_vec),
807 bv = vmalloc(max_pages * sizeof(struct bio_vec));
812 if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT)
813 pages = kmalloc_array(max_pages, sizeof(struct page *),
817 pages = vmalloc(max_pages * sizeof(struct page *));
826 while (count && npages < max_pages) {
827 rc = iov_iter_get_pages(iter, pages, count, max_pages, &start);
829 cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc);
834 cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc,
839 iov_iter_advance(iter, rc);
842 cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE);
844 if (npages + cur_npages > max_pages) {
845 cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n",
846 npages + cur_npages, max_pages);
850 for (i = 0; i < cur_npages; i++) {
851 len = rc > PAGE_SIZE ? PAGE_SIZE : rc;
852 bv[npages + i].bv_page = pages[i];
853 bv[npages + i].bv_offset = start;
854 bv[npages + i].bv_len = len - start;
859 npages += cur_npages;
864 ctx->len = saved_len - count;
865 ctx->npages = npages;
866 iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len);
871 * cifs_alloc_hash - allocate hash and hash context together
873 * The caller has to make sure @sdesc is initialized to either NULL or
874 * a valid context. Both can be freed via cifs_free_hash().
877 cifs_alloc_hash(const char *name,
878 struct crypto_shash **shash, struct sdesc **sdesc)
886 *shash = crypto_alloc_shash(name, 0, 0);
887 if (IS_ERR(*shash)) {
888 cifs_dbg(VFS, "could not allocate crypto %s\n", name);
889 rc = PTR_ERR(*shash);
895 size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash);
896 *sdesc = kmalloc(size, GFP_KERNEL);
897 if (*sdesc == NULL) {
898 cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name);
899 crypto_free_shash(*shash);
904 (*sdesc)->shash.tfm = *shash;
905 (*sdesc)->shash.flags = 0x0;
910 * cifs_free_hash - free hash and hash context together
912 * Freeing a NULL hash or context is safe.
915 cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc)
920 crypto_free_shash(*shash);