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1/*
2 * fs/cifs/cifsfs.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24/* Note that BB means BUGBUG (ie something to fix eventually) */
25
26#include <linux/module.h>
27#include <linux/fs.h>
28#include <linux/mount.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/list.h>
32#include <linux/seq_file.h>
33#include <linux/vfs.h>
34#include <linux/mempool.h>
35#include <linux/delay.h>
36#include <linux/kthread.h>
37#include <linux/freezer.h>
38#include <linux/namei.h>
39#include <net/ipv6.h>
40#include "cifsfs.h"
41#include "cifspdu.h"
42#define DECLARE_GLOBALS_HERE
43#include "cifsglob.h"
44#include "cifsproto.h"
45#include "cifs_debug.h"
46#include "cifs_fs_sb.h"
47#include <linux/mm.h>
48#include <linux/key-type.h>
49#include "cifs_spnego.h"
50#include "fscache.h"
51#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52
53int cifsFYI = 0;
54int cifsERROR = 1;
55int traceSMB = 0;
56unsigned int oplockEnabled = 1;
57unsigned int linuxExtEnabled = 1;
58unsigned int lookupCacheEnabled = 1;
59unsigned int multiuser_mount = 0;
60unsigned int global_secflags = CIFSSEC_DEF;
61/* unsigned int ntlmv2_support = 0; */
62unsigned int sign_CIFS_PDUs = 1;
63static const struct super_operations cifs_super_ops;
64unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
65module_param(CIFSMaxBufSize, int, 0);
66MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
67 "Default: 16384 Range: 8192 to 130048");
68unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
69module_param(cifs_min_rcv, int, 0);
70MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
71 "1 to 64");
72unsigned int cifs_min_small = 30;
73module_param(cifs_min_small, int, 0);
74MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
75 "Range: 2 to 256");
76unsigned int cifs_max_pending = CIFS_MAX_REQ;
77module_param(cifs_max_pending, int, 0);
78MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
79 "Default: 50 Range: 2 to 256");
80unsigned short echo_retries = 5;
81module_param(echo_retries, ushort, 0644);
82MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
83 "reconnecting server. Default: 5. 0 means "
84 "never reconnect.");
85extern mempool_t *cifs_sm_req_poolp;
86extern mempool_t *cifs_req_poolp;
87extern mempool_t *cifs_mid_poolp;
88
89static int
90cifs_read_super(struct super_block *sb)
91{
92 struct inode *inode;
93 struct cifs_sb_info *cifs_sb;
94 int rc = 0;
95
96 cifs_sb = CIFS_SB(sb);
97
98 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
99 sb->s_flags |= MS_POSIXACL;
100
101 if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
102 sb->s_maxbytes = MAX_LFS_FILESIZE;
103 else
104 sb->s_maxbytes = MAX_NON_LFS;
105
106 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
107 sb->s_time_gran = 100;
108
109 sb->s_magic = CIFS_MAGIC_NUMBER;
110 sb->s_op = &cifs_super_ops;
111 sb->s_bdi = &cifs_sb->bdi;
112 sb->s_blocksize = CIFS_MAX_MSGSIZE;
113 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
114 inode = cifs_root_iget(sb);
115
116 if (IS_ERR(inode)) {
117 rc = PTR_ERR(inode);
118 inode = NULL;
119 goto out_no_root;
120 }
121
122 sb->s_root = d_alloc_root(inode);
123
124 if (!sb->s_root) {
125 rc = -ENOMEM;
126 goto out_no_root;
127 }
128
129 /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
130 if (cifs_sb_master_tcon(cifs_sb)->nocase)
131 sb->s_d_op = &cifs_ci_dentry_ops;
132 else
133 sb->s_d_op = &cifs_dentry_ops;
134
135#ifdef CIFS_NFSD_EXPORT
136 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
137 cFYI(1, "export ops supported");
138 sb->s_export_op = &cifs_export_ops;
139 }
140#endif /* CIFS_NFSD_EXPORT */
141
142 return 0;
143
144out_no_root:
145 cERROR(1, "cifs_read_super: get root inode failed");
146 if (inode)
147 iput(inode);
148
149 return rc;
150}
151
152static void cifs_kill_sb(struct super_block *sb)
153{
154 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
155 kill_anon_super(sb);
156 cifs_umount(cifs_sb);
157}
158
159static int
160cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
161{
162 struct super_block *sb = dentry->d_sb;
163 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
164 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
165 int rc = -EOPNOTSUPP;
166 int xid;
167
168 xid = GetXid();
169
170 buf->f_type = CIFS_MAGIC_NUMBER;
171
172 /*
173 * PATH_MAX may be too long - it would presumably be total path,
174 * but note that some servers (includinng Samba 3) have a shorter
175 * maximum path.
176 *
177 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
178 */
179 buf->f_namelen = PATH_MAX;
180 buf->f_files = 0; /* undefined */
181 buf->f_ffree = 0; /* unlimited */
182
183 /*
184 * We could add a second check for a QFS Unix capability bit
185 */
186 if ((tcon->ses->capabilities & CAP_UNIX) &&
187 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
188 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
189
190 /*
191 * Only need to call the old QFSInfo if failed on newer one,
192 * e.g. by OS/2.
193 **/
194 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
195 rc = CIFSSMBQFSInfo(xid, tcon, buf);
196
197 /*
198 * Some old Windows servers also do not support level 103, retry with
199 * older level one if old server failed the previous call or we
200 * bypassed it because we detected that this was an older LANMAN sess
201 */
202 if (rc)
203 rc = SMBOldQFSInfo(xid, tcon, buf);
204
205 FreeXid(xid);
206 return 0;
207}
208
209static int cifs_permission(struct inode *inode, int mask)
210{
211 struct cifs_sb_info *cifs_sb;
212
213 cifs_sb = CIFS_SB(inode->i_sb);
214
215 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
216 if ((mask & MAY_EXEC) && !execute_ok(inode))
217 return -EACCES;
218 else
219 return 0;
220 } else /* file mode might have been restricted at mount time
221 on the client (above and beyond ACL on servers) for
222 servers which do not support setting and viewing mode bits,
223 so allowing client to check permissions is useful */
224 return generic_permission(inode, mask);
225}
226
227static struct kmem_cache *cifs_inode_cachep;
228static struct kmem_cache *cifs_req_cachep;
229static struct kmem_cache *cifs_mid_cachep;
230static struct kmem_cache *cifs_sm_req_cachep;
231mempool_t *cifs_sm_req_poolp;
232mempool_t *cifs_req_poolp;
233mempool_t *cifs_mid_poolp;
234
235static struct inode *
236cifs_alloc_inode(struct super_block *sb)
237{
238 struct cifsInodeInfo *cifs_inode;
239 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
240 if (!cifs_inode)
241 return NULL;
242 cifs_inode->cifsAttrs = 0x20; /* default */
243 cifs_inode->time = 0;
244 /* Until the file is open and we have gotten oplock
245 info back from the server, can not assume caching of
246 file data or metadata */
247 cifs_set_oplock_level(cifs_inode, 0);
248 cifs_inode->delete_pending = false;
249 cifs_inode->invalid_mapping = false;
250 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
251 cifs_inode->server_eof = 0;
252 cifs_inode->uniqueid = 0;
253 cifs_inode->createtime = 0;
254
255 /* Can not set i_flags here - they get immediately overwritten
256 to zero by the VFS */
257/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
258 INIT_LIST_HEAD(&cifs_inode->openFileList);
259 return &cifs_inode->vfs_inode;
260}
261
262static void cifs_i_callback(struct rcu_head *head)
263{
264 struct inode *inode = container_of(head, struct inode, i_rcu);
265 INIT_LIST_HEAD(&inode->i_dentry);
266 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
267}
268
269static void
270cifs_destroy_inode(struct inode *inode)
271{
272 call_rcu(&inode->i_rcu, cifs_i_callback);
273}
274
275static void
276cifs_evict_inode(struct inode *inode)
277{
278 truncate_inode_pages(&inode->i_data, 0);
279 end_writeback(inode);
280 cifs_fscache_release_inode_cookie(inode);
281}
282
283static void
284cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
285{
286 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
287 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
288
289 seq_printf(s, ",addr=");
290
291 switch (server->dstaddr.ss_family) {
292 case AF_INET:
293 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
294 break;
295 case AF_INET6:
296 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
297 if (sa6->sin6_scope_id)
298 seq_printf(s, "%%%u", sa6->sin6_scope_id);
299 break;
300 default:
301 seq_printf(s, "(unknown)");
302 }
303}
304
305static void
306cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
307{
308 seq_printf(s, ",sec=");
309
310 switch (server->secType) {
311 case LANMAN:
312 seq_printf(s, "lanman");
313 break;
314 case NTLMv2:
315 seq_printf(s, "ntlmv2");
316 break;
317 case NTLM:
318 seq_printf(s, "ntlm");
319 break;
320 case Kerberos:
321 seq_printf(s, "krb5");
322 break;
323 case RawNTLMSSP:
324 seq_printf(s, "ntlmssp");
325 break;
326 default:
327 /* shouldn't ever happen */
328 seq_printf(s, "unknown");
329 break;
330 }
331
332 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
333 seq_printf(s, "i");
334}
335
336/*
337 * cifs_show_options() is for displaying mount options in /proc/mounts.
338 * Not all settable options are displayed but most of the important
339 * ones are.
340 */
341static int
342cifs_show_options(struct seq_file *s, struct vfsmount *m)
343{
344 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
345 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
346 struct sockaddr *srcaddr;
347 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
348
349 cifs_show_security(s, tcon->ses->server);
350
351 seq_printf(s, ",unc=%s", tcon->treeName);
352
353 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
354 seq_printf(s, ",multiuser");
355 else if (tcon->ses->user_name)
356 seq_printf(s, ",username=%s", tcon->ses->user_name);
357
358 if (tcon->ses->domainName)
359 seq_printf(s, ",domain=%s", tcon->ses->domainName);
360
361 if (srcaddr->sa_family != AF_UNSPEC) {
362 struct sockaddr_in *saddr4;
363 struct sockaddr_in6 *saddr6;
364 saddr4 = (struct sockaddr_in *)srcaddr;
365 saddr6 = (struct sockaddr_in6 *)srcaddr;
366 if (srcaddr->sa_family == AF_INET6)
367 seq_printf(s, ",srcaddr=%pI6c",
368 &saddr6->sin6_addr);
369 else if (srcaddr->sa_family == AF_INET)
370 seq_printf(s, ",srcaddr=%pI4",
371 &saddr4->sin_addr.s_addr);
372 else
373 seq_printf(s, ",srcaddr=BAD-AF:%i",
374 (int)(srcaddr->sa_family));
375 }
376
377 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
378 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
379 seq_printf(s, ",forceuid");
380 else
381 seq_printf(s, ",noforceuid");
382
383 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
385 seq_printf(s, ",forcegid");
386 else
387 seq_printf(s, ",noforcegid");
388
389 cifs_show_address(s, tcon->ses->server);
390
391 if (!tcon->unix_ext)
392 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
393 cifs_sb->mnt_file_mode,
394 cifs_sb->mnt_dir_mode);
395 if (tcon->seal)
396 seq_printf(s, ",seal");
397 if (tcon->nocase)
398 seq_printf(s, ",nocase");
399 if (tcon->retry)
400 seq_printf(s, ",hard");
401 if (tcon->unix_ext)
402 seq_printf(s, ",unix");
403 else
404 seq_printf(s, ",nounix");
405 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
406 seq_printf(s, ",posixpaths");
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
408 seq_printf(s, ",setuids");
409 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
410 seq_printf(s, ",serverino");
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
412 seq_printf(s, ",rwpidforward");
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
414 seq_printf(s, ",forcemand");
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
416 seq_printf(s, ",directio");
417 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
418 seq_printf(s, ",nouser_xattr");
419 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
420 seq_printf(s, ",mapchars");
421 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
422 seq_printf(s, ",sfu");
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
424 seq_printf(s, ",nobrl");
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
426 seq_printf(s, ",cifsacl");
427 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
428 seq_printf(s, ",dynperm");
429 if (m->mnt_sb->s_flags & MS_POSIXACL)
430 seq_printf(s, ",acl");
431 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
432 seq_printf(s, ",mfsymlinks");
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
434 seq_printf(s, ",fsc");
435
436 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
437 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
438 /* convert actimeo and display it in seconds */
439 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
440
441 return 0;
442}
443
444static void cifs_umount_begin(struct super_block *sb)
445{
446 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
447 struct cifs_tcon *tcon;
448
449 if (cifs_sb == NULL)
450 return;
451
452 tcon = cifs_sb_master_tcon(cifs_sb);
453
454 spin_lock(&cifs_tcp_ses_lock);
455 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
456 /* we have other mounts to same share or we have
457 already tried to force umount this and woken up
458 all waiting network requests, nothing to do */
459 spin_unlock(&cifs_tcp_ses_lock);
460 return;
461 } else if (tcon->tc_count == 1)
462 tcon->tidStatus = CifsExiting;
463 spin_unlock(&cifs_tcp_ses_lock);
464
465 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
466 /* cancel_notify_requests(tcon); */
467 if (tcon->ses && tcon->ses->server) {
468 cFYI(1, "wake up tasks now - umount begin not complete");
469 wake_up_all(&tcon->ses->server->request_q);
470 wake_up_all(&tcon->ses->server->response_q);
471 msleep(1); /* yield */
472 /* we have to kick the requests once more */
473 wake_up_all(&tcon->ses->server->response_q);
474 msleep(1);
475 }
476
477 return;
478}
479
480#ifdef CONFIG_CIFS_STATS2
481static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
482{
483 /* BB FIXME */
484 return 0;
485}
486#endif
487
488static int cifs_remount(struct super_block *sb, int *flags, char *data)
489{
490 *flags |= MS_NODIRATIME;
491 return 0;
492}
493
494static int cifs_drop_inode(struct inode *inode)
495{
496 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
497
498 /* no serverino => unconditional eviction */
499 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
500 generic_drop_inode(inode);
501}
502
503static const struct super_operations cifs_super_ops = {
504 .statfs = cifs_statfs,
505 .alloc_inode = cifs_alloc_inode,
506 .destroy_inode = cifs_destroy_inode,
507 .drop_inode = cifs_drop_inode,
508 .evict_inode = cifs_evict_inode,
509/* .delete_inode = cifs_delete_inode, */ /* Do not need above
510 function unless later we add lazy close of inodes or unless the
511 kernel forgets to call us with the same number of releases (closes)
512 as opens */
513 .show_options = cifs_show_options,
514 .umount_begin = cifs_umount_begin,
515 .remount_fs = cifs_remount,
516#ifdef CONFIG_CIFS_STATS2
517 .show_stats = cifs_show_stats,
518#endif
519};
520
521/*
522 * Get root dentry from superblock according to prefix path mount option.
523 * Return dentry with refcount + 1 on success and NULL otherwise.
524 */
525static struct dentry *
526cifs_get_root(struct smb_vol *vol, struct super_block *sb)
527{
528 struct dentry *dentry;
529 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
530 char *full_path = NULL;
531 char *s, *p;
532 char sep;
533 int xid;
534
535 full_path = cifs_build_path_to_root(vol, cifs_sb,
536 cifs_sb_master_tcon(cifs_sb));
537 if (full_path == NULL)
538 return ERR_PTR(-ENOMEM);
539
540 cFYI(1, "Get root dentry for %s", full_path);
541
542 xid = GetXid();
543 sep = CIFS_DIR_SEP(cifs_sb);
544 dentry = dget(sb->s_root);
545 p = s = full_path;
546
547 do {
548 struct inode *dir = dentry->d_inode;
549 struct dentry *child;
550
551 if (!dir) {
552 dput(dentry);
553 dentry = ERR_PTR(-ENOENT);
554 break;
555 }
556
557 /* skip separators */
558 while (*s == sep)
559 s++;
560 if (!*s)
561 break;
562 p = s++;
563 /* next separator */
564 while (*s && *s != sep)
565 s++;
566
567 mutex_lock(&dir->i_mutex);
568 child = lookup_one_len(p, dentry, s - p);
569 mutex_unlock(&dir->i_mutex);
570 dput(dentry);
571 dentry = child;
572 } while (!IS_ERR(dentry));
573 _FreeXid(xid);
574 kfree(full_path);
575 return dentry;
576}
577
578static int cifs_set_super(struct super_block *sb, void *data)
579{
580 struct cifs_mnt_data *mnt_data = data;
581 sb->s_fs_info = mnt_data->cifs_sb;
582 return set_anon_super(sb, NULL);
583}
584
585static struct dentry *
586cifs_do_mount(struct file_system_type *fs_type,
587 int flags, const char *dev_name, void *data)
588{
589 int rc;
590 struct super_block *sb;
591 struct cifs_sb_info *cifs_sb;
592 struct smb_vol *volume_info;
593 struct cifs_mnt_data mnt_data;
594 struct dentry *root;
595
596 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
597
598 volume_info = cifs_get_volume_info((char *)data, dev_name);
599 if (IS_ERR(volume_info))
600 return ERR_CAST(volume_info);
601
602 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
603 if (cifs_sb == NULL) {
604 root = ERR_PTR(-ENOMEM);
605 goto out_nls;
606 }
607
608 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
609 if (cifs_sb->mountdata == NULL) {
610 root = ERR_PTR(-ENOMEM);
611 goto out_cifs_sb;
612 }
613
614 cifs_setup_cifs_sb(volume_info, cifs_sb);
615
616 rc = cifs_mount(cifs_sb, volume_info);
617 if (rc) {
618 if (!(flags & MS_SILENT))
619 cERROR(1, "cifs_mount failed w/return code = %d", rc);
620 root = ERR_PTR(rc);
621 goto out_mountdata;
622 }
623
624 mnt_data.vol = volume_info;
625 mnt_data.cifs_sb = cifs_sb;
626 mnt_data.flags = flags;
627
628 sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
629 if (IS_ERR(sb)) {
630 root = ERR_CAST(sb);
631 cifs_umount(cifs_sb);
632 goto out;
633 }
634
635 if (sb->s_root) {
636 cFYI(1, "Use existing superblock");
637 cifs_umount(cifs_sb);
638 } else {
639 sb->s_flags = flags;
640 /* BB should we make this contingent on mount parm? */
641 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
642
643 rc = cifs_read_super(sb);
644 if (rc) {
645 root = ERR_PTR(rc);
646 goto out_super;
647 }
648
649 sb->s_flags |= MS_ACTIVE;
650 }
651
652 root = cifs_get_root(volume_info, sb);
653 if (IS_ERR(root))
654 goto out_super;
655
656 cFYI(1, "dentry root is: %p", root);
657 goto out;
658
659out_super:
660 deactivate_locked_super(sb);
661out:
662 cifs_cleanup_volume_info(volume_info);
663 return root;
664
665out_mountdata:
666 kfree(cifs_sb->mountdata);
667out_cifs_sb:
668 kfree(cifs_sb);
669out_nls:
670 unload_nls(volume_info->local_nls);
671 goto out;
672}
673
674static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
675 unsigned long nr_segs, loff_t pos)
676{
677 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
678 ssize_t written;
679 int rc;
680
681 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
682
683 if (CIFS_I(inode)->clientCanCacheAll)
684 return written;
685
686 rc = filemap_fdatawrite(inode->i_mapping);
687 if (rc)
688 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
689
690 return written;
691}
692
693static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
694{
695 /*
696 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
697 * the cached file length
698 */
699 if (origin != SEEK_SET || origin != SEEK_CUR) {
700 int rc;
701 struct inode *inode = file->f_path.dentry->d_inode;
702
703 /*
704 * We need to be sure that all dirty pages are written and the
705 * server has the newest file length.
706 */
707 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
708 inode->i_mapping->nrpages != 0) {
709 rc = filemap_fdatawait(inode->i_mapping);
710 if (rc) {
711 mapping_set_error(inode->i_mapping, rc);
712 return rc;
713 }
714 }
715 /*
716 * Some applications poll for the file length in this strange
717 * way so we must seek to end on non-oplocked files by
718 * setting the revalidate time to zero.
719 */
720 CIFS_I(inode)->time = 0;
721
722 rc = cifs_revalidate_file_attr(file);
723 if (rc < 0)
724 return (loff_t)rc;
725 }
726 return generic_file_llseek_unlocked(file, offset, origin);
727}
728
729static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
730{
731 /* note that this is called by vfs setlease with lock_flocks held
732 to protect *lease from going away */
733 struct inode *inode = file->f_path.dentry->d_inode;
734 struct cifsFileInfo *cfile = file->private_data;
735
736 if (!(S_ISREG(inode->i_mode)))
737 return -EINVAL;
738
739 /* check if file is oplocked */
740 if (((arg == F_RDLCK) &&
741 (CIFS_I(inode)->clientCanCacheRead)) ||
742 ((arg == F_WRLCK) &&
743 (CIFS_I(inode)->clientCanCacheAll)))
744 return generic_setlease(file, arg, lease);
745 else if (tlink_tcon(cfile->tlink)->local_lease &&
746 !CIFS_I(inode)->clientCanCacheRead)
747 /* If the server claims to support oplock on this
748 file, then we still need to check oplock even
749 if the local_lease mount option is set, but there
750 are servers which do not support oplock for which
751 this mount option may be useful if the user
752 knows that the file won't be changed on the server
753 by anyone else */
754 return generic_setlease(file, arg, lease);
755 else
756 return -EAGAIN;
757}
758
759struct file_system_type cifs_fs_type = {
760 .owner = THIS_MODULE,
761 .name = "cifs",
762 .mount = cifs_do_mount,
763 .kill_sb = cifs_kill_sb,
764 /* .fs_flags */
765};
766const struct inode_operations cifs_dir_inode_ops = {
767 .create = cifs_create,
768 .lookup = cifs_lookup,
769 .getattr = cifs_getattr,
770 .unlink = cifs_unlink,
771 .link = cifs_hardlink,
772 .mkdir = cifs_mkdir,
773 .rmdir = cifs_rmdir,
774 .rename = cifs_rename,
775 .permission = cifs_permission,
776/* revalidate:cifs_revalidate, */
777 .setattr = cifs_setattr,
778 .symlink = cifs_symlink,
779 .mknod = cifs_mknod,
780#ifdef CONFIG_CIFS_XATTR
781 .setxattr = cifs_setxattr,
782 .getxattr = cifs_getxattr,
783 .listxattr = cifs_listxattr,
784 .removexattr = cifs_removexattr,
785#endif
786};
787
788const struct inode_operations cifs_file_inode_ops = {
789/* revalidate:cifs_revalidate, */
790 .setattr = cifs_setattr,
791 .getattr = cifs_getattr, /* do we need this anymore? */
792 .rename = cifs_rename,
793 .permission = cifs_permission,
794#ifdef CONFIG_CIFS_XATTR
795 .setxattr = cifs_setxattr,
796 .getxattr = cifs_getxattr,
797 .listxattr = cifs_listxattr,
798 .removexattr = cifs_removexattr,
799#endif
800};
801
802const struct inode_operations cifs_symlink_inode_ops = {
803 .readlink = generic_readlink,
804 .follow_link = cifs_follow_link,
805 .put_link = cifs_put_link,
806 .permission = cifs_permission,
807 /* BB add the following two eventually */
808 /* revalidate: cifs_revalidate,
809 setattr: cifs_notify_change, *//* BB do we need notify change */
810#ifdef CONFIG_CIFS_XATTR
811 .setxattr = cifs_setxattr,
812 .getxattr = cifs_getxattr,
813 .listxattr = cifs_listxattr,
814 .removexattr = cifs_removexattr,
815#endif
816};
817
818const struct file_operations cifs_file_ops = {
819 .read = do_sync_read,
820 .write = do_sync_write,
821 .aio_read = generic_file_aio_read,
822 .aio_write = cifs_file_aio_write,
823 .open = cifs_open,
824 .release = cifs_close,
825 .lock = cifs_lock,
826 .fsync = cifs_fsync,
827 .flush = cifs_flush,
828 .mmap = cifs_file_mmap,
829 .splice_read = generic_file_splice_read,
830 .llseek = cifs_llseek,
831#ifdef CONFIG_CIFS_POSIX
832 .unlocked_ioctl = cifs_ioctl,
833#endif /* CONFIG_CIFS_POSIX */
834 .setlease = cifs_setlease,
835};
836
837const struct file_operations cifs_file_strict_ops = {
838 .read = do_sync_read,
839 .write = do_sync_write,
840 .aio_read = cifs_strict_readv,
841 .aio_write = cifs_strict_writev,
842 .open = cifs_open,
843 .release = cifs_close,
844 .lock = cifs_lock,
845 .fsync = cifs_strict_fsync,
846 .flush = cifs_flush,
847 .mmap = cifs_file_strict_mmap,
848 .splice_read = generic_file_splice_read,
849 .llseek = cifs_llseek,
850#ifdef CONFIG_CIFS_POSIX
851 .unlocked_ioctl = cifs_ioctl,
852#endif /* CONFIG_CIFS_POSIX */
853 .setlease = cifs_setlease,
854};
855
856const struct file_operations cifs_file_direct_ops = {
857 /* BB reevaluate whether they can be done with directio, no cache */
858 .read = do_sync_read,
859 .write = do_sync_write,
860 .aio_read = cifs_user_readv,
861 .aio_write = cifs_user_writev,
862 .open = cifs_open,
863 .release = cifs_close,
864 .lock = cifs_lock,
865 .fsync = cifs_fsync,
866 .flush = cifs_flush,
867 .mmap = cifs_file_mmap,
868 .splice_read = generic_file_splice_read,
869#ifdef CONFIG_CIFS_POSIX
870 .unlocked_ioctl = cifs_ioctl,
871#endif /* CONFIG_CIFS_POSIX */
872 .llseek = cifs_llseek,
873 .setlease = cifs_setlease,
874};
875
876const struct file_operations cifs_file_nobrl_ops = {
877 .read = do_sync_read,
878 .write = do_sync_write,
879 .aio_read = generic_file_aio_read,
880 .aio_write = cifs_file_aio_write,
881 .open = cifs_open,
882 .release = cifs_close,
883 .fsync = cifs_fsync,
884 .flush = cifs_flush,
885 .mmap = cifs_file_mmap,
886 .splice_read = generic_file_splice_read,
887 .llseek = cifs_llseek,
888#ifdef CONFIG_CIFS_POSIX
889 .unlocked_ioctl = cifs_ioctl,
890#endif /* CONFIG_CIFS_POSIX */
891 .setlease = cifs_setlease,
892};
893
894const struct file_operations cifs_file_strict_nobrl_ops = {
895 .read = do_sync_read,
896 .write = do_sync_write,
897 .aio_read = cifs_strict_readv,
898 .aio_write = cifs_strict_writev,
899 .open = cifs_open,
900 .release = cifs_close,
901 .fsync = cifs_strict_fsync,
902 .flush = cifs_flush,
903 .mmap = cifs_file_strict_mmap,
904 .splice_read = generic_file_splice_read,
905 .llseek = cifs_llseek,
906#ifdef CONFIG_CIFS_POSIX
907 .unlocked_ioctl = cifs_ioctl,
908#endif /* CONFIG_CIFS_POSIX */
909 .setlease = cifs_setlease,
910};
911
912const struct file_operations cifs_file_direct_nobrl_ops = {
913 /* BB reevaluate whether they can be done with directio, no cache */
914 .read = do_sync_read,
915 .write = do_sync_write,
916 .aio_read = cifs_user_readv,
917 .aio_write = cifs_user_writev,
918 .open = cifs_open,
919 .release = cifs_close,
920 .fsync = cifs_fsync,
921 .flush = cifs_flush,
922 .mmap = cifs_file_mmap,
923 .splice_read = generic_file_splice_read,
924#ifdef CONFIG_CIFS_POSIX
925 .unlocked_ioctl = cifs_ioctl,
926#endif /* CONFIG_CIFS_POSIX */
927 .llseek = cifs_llseek,
928 .setlease = cifs_setlease,
929};
930
931const struct file_operations cifs_dir_ops = {
932 .readdir = cifs_readdir,
933 .release = cifs_closedir,
934 .read = generic_read_dir,
935 .unlocked_ioctl = cifs_ioctl,
936 .llseek = generic_file_llseek,
937};
938
939static void
940cifs_init_once(void *inode)
941{
942 struct cifsInodeInfo *cifsi = inode;
943
944 inode_init_once(&cifsi->vfs_inode);
945 INIT_LIST_HEAD(&cifsi->lockList);
946}
947
948static int
949cifs_init_inodecache(void)
950{
951 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
952 sizeof(struct cifsInodeInfo),
953 0, (SLAB_RECLAIM_ACCOUNT|
954 SLAB_MEM_SPREAD),
955 cifs_init_once);
956 if (cifs_inode_cachep == NULL)
957 return -ENOMEM;
958
959 return 0;
960}
961
962static void
963cifs_destroy_inodecache(void)
964{
965 kmem_cache_destroy(cifs_inode_cachep);
966}
967
968static int
969cifs_init_request_bufs(void)
970{
971 if (CIFSMaxBufSize < 8192) {
972 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
973 Unicode path name has to fit in any SMB/CIFS path based frames */
974 CIFSMaxBufSize = 8192;
975 } else if (CIFSMaxBufSize > 1024*127) {
976 CIFSMaxBufSize = 1024 * 127;
977 } else {
978 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
979 }
980/* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
981 cifs_req_cachep = kmem_cache_create("cifs_request",
982 CIFSMaxBufSize +
983 MAX_CIFS_HDR_SIZE, 0,
984 SLAB_HWCACHE_ALIGN, NULL);
985 if (cifs_req_cachep == NULL)
986 return -ENOMEM;
987
988 if (cifs_min_rcv < 1)
989 cifs_min_rcv = 1;
990 else if (cifs_min_rcv > 64) {
991 cifs_min_rcv = 64;
992 cERROR(1, "cifs_min_rcv set to maximum (64)");
993 }
994
995 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
996 cifs_req_cachep);
997
998 if (cifs_req_poolp == NULL) {
999 kmem_cache_destroy(cifs_req_cachep);
1000 return -ENOMEM;
1001 }
1002 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1003 almost all handle based requests (but not write response, nor is it
1004 sufficient for path based requests). A smaller size would have
1005 been more efficient (compacting multiple slab items on one 4k page)
1006 for the case in which debug was on, but this larger size allows
1007 more SMBs to use small buffer alloc and is still much more
1008 efficient to alloc 1 per page off the slab compared to 17K (5page)
1009 alloc of large cifs buffers even when page debugging is on */
1010 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1011 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1012 NULL);
1013 if (cifs_sm_req_cachep == NULL) {
1014 mempool_destroy(cifs_req_poolp);
1015 kmem_cache_destroy(cifs_req_cachep);
1016 return -ENOMEM;
1017 }
1018
1019 if (cifs_min_small < 2)
1020 cifs_min_small = 2;
1021 else if (cifs_min_small > 256) {
1022 cifs_min_small = 256;
1023 cFYI(1, "cifs_min_small set to maximum (256)");
1024 }
1025
1026 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1027 cifs_sm_req_cachep);
1028
1029 if (cifs_sm_req_poolp == NULL) {
1030 mempool_destroy(cifs_req_poolp);
1031 kmem_cache_destroy(cifs_req_cachep);
1032 kmem_cache_destroy(cifs_sm_req_cachep);
1033 return -ENOMEM;
1034 }
1035
1036 return 0;
1037}
1038
1039static void
1040cifs_destroy_request_bufs(void)
1041{
1042 mempool_destroy(cifs_req_poolp);
1043 kmem_cache_destroy(cifs_req_cachep);
1044 mempool_destroy(cifs_sm_req_poolp);
1045 kmem_cache_destroy(cifs_sm_req_cachep);
1046}
1047
1048static int
1049cifs_init_mids(void)
1050{
1051 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1052 sizeof(struct mid_q_entry), 0,
1053 SLAB_HWCACHE_ALIGN, NULL);
1054 if (cifs_mid_cachep == NULL)
1055 return -ENOMEM;
1056
1057 /* 3 is a reasonable minimum number of simultaneous operations */
1058 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1059 if (cifs_mid_poolp == NULL) {
1060 kmem_cache_destroy(cifs_mid_cachep);
1061 return -ENOMEM;
1062 }
1063
1064 return 0;
1065}
1066
1067static void
1068cifs_destroy_mids(void)
1069{
1070 mempool_destroy(cifs_mid_poolp);
1071 kmem_cache_destroy(cifs_mid_cachep);
1072}
1073
1074static int __init
1075init_cifs(void)
1076{
1077 int rc = 0;
1078 cifs_proc_init();
1079 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1080#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1081 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1082 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1083#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1084/*
1085 * Initialize Global counters
1086 */
1087 atomic_set(&sesInfoAllocCount, 0);
1088 atomic_set(&tconInfoAllocCount, 0);
1089 atomic_set(&tcpSesAllocCount, 0);
1090 atomic_set(&tcpSesReconnectCount, 0);
1091 atomic_set(&tconInfoReconnectCount, 0);
1092
1093 atomic_set(&bufAllocCount, 0);
1094 atomic_set(&smBufAllocCount, 0);
1095#ifdef CONFIG_CIFS_STATS2
1096 atomic_set(&totBufAllocCount, 0);
1097 atomic_set(&totSmBufAllocCount, 0);
1098#endif /* CONFIG_CIFS_STATS2 */
1099
1100 atomic_set(&midCount, 0);
1101 GlobalCurrentXid = 0;
1102 GlobalTotalActiveXid = 0;
1103 GlobalMaxActiveXid = 0;
1104 spin_lock_init(&cifs_tcp_ses_lock);
1105 spin_lock_init(&cifs_file_list_lock);
1106 spin_lock_init(&GlobalMid_Lock);
1107
1108 if (cifs_max_pending < 2) {
1109 cifs_max_pending = 2;
1110 cFYI(1, "cifs_max_pending set to min of 2");
1111 } else if (cifs_max_pending > 256) {
1112 cifs_max_pending = 256;
1113 cFYI(1, "cifs_max_pending set to max of 256");
1114 }
1115
1116 rc = cifs_fscache_register();
1117 if (rc)
1118 goto out_clean_proc;
1119
1120 rc = cifs_init_inodecache();
1121 if (rc)
1122 goto out_unreg_fscache;
1123
1124 rc = cifs_init_mids();
1125 if (rc)
1126 goto out_destroy_inodecache;
1127
1128 rc = cifs_init_request_bufs();
1129 if (rc)
1130 goto out_destroy_mids;
1131
1132#ifdef CONFIG_CIFS_UPCALL
1133 rc = register_key_type(&cifs_spnego_key_type);
1134 if (rc)
1135 goto out_destroy_request_bufs;
1136#endif /* CONFIG_CIFS_UPCALL */
1137
1138#ifdef CONFIG_CIFS_ACL
1139 rc = init_cifs_idmap();
1140 if (rc)
1141 goto out_register_key_type;
1142#endif /* CONFIG_CIFS_ACL */
1143
1144 rc = register_filesystem(&cifs_fs_type);
1145 if (rc)
1146 goto out_init_cifs_idmap;
1147
1148 return 0;
1149
1150out_init_cifs_idmap:
1151#ifdef CONFIG_CIFS_ACL
1152 exit_cifs_idmap();
1153out_register_key_type:
1154#endif
1155#ifdef CONFIG_CIFS_UPCALL
1156 unregister_key_type(&cifs_spnego_key_type);
1157out_destroy_request_bufs:
1158#endif
1159 cifs_destroy_request_bufs();
1160out_destroy_mids:
1161 cifs_destroy_mids();
1162out_destroy_inodecache:
1163 cifs_destroy_inodecache();
1164out_unreg_fscache:
1165 cifs_fscache_unregister();
1166out_clean_proc:
1167 cifs_proc_clean();
1168 return rc;
1169}
1170
1171static void __exit
1172exit_cifs(void)
1173{
1174 cFYI(DBG2, "exit_cifs");
1175 cifs_proc_clean();
1176 cifs_fscache_unregister();
1177#ifdef CONFIG_CIFS_DFS_UPCALL
1178 cifs_dfs_release_automount_timer();
1179#endif
1180#ifdef CONFIG_CIFS_ACL
1181 cifs_destroy_idmaptrees();
1182 exit_cifs_idmap();
1183#endif
1184#ifdef CONFIG_CIFS_UPCALL
1185 unregister_key_type(&cifs_spnego_key_type);
1186#endif
1187 unregister_filesystem(&cifs_fs_type);
1188 cifs_destroy_inodecache();
1189 cifs_destroy_mids();
1190 cifs_destroy_request_bufs();
1191}
1192
1193MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1194MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1195MODULE_DESCRIPTION
1196 ("VFS to access servers complying with the SNIA CIFS Specification "
1197 "e.g. Samba and Windows");
1198MODULE_VERSION(CIFS_VERSION);
1199module_init(init_cifs)
1200module_exit(exit_cifs)
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/cifsfs.c
4 *
5 * Copyright (C) International Business Machines Corp., 2002,2008
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 *
8 * Common Internet FileSystem (CIFS) client
9 *
10 */
11
12/* Note that BB means BUGBUG (ie something to fix eventually) */
13
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/mount.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/list.h>
20#include <linux/seq_file.h>
21#include <linux/vfs.h>
22#include <linux/mempool.h>
23#include <linux/delay.h>
24#include <linux/kthread.h>
25#include <linux/freezer.h>
26#include <linux/namei.h>
27#include <linux/random.h>
28#include <linux/uuid.h>
29#include <linux/xattr.h>
30#include <net/ipv6.h>
31#include "cifsfs.h"
32#include "cifspdu.h"
33#define DECLARE_GLOBALS_HERE
34#include "cifsglob.h"
35#include "cifsproto.h"
36#include "cifs_debug.h"
37#include "cifs_fs_sb.h"
38#include <linux/mm.h>
39#include <linux/key-type.h>
40#include "cifs_spnego.h"
41#include "fscache.h"
42#include "smb2pdu.h"
43#ifdef CONFIG_CIFS_DFS_UPCALL
44#include "dfs_cache.h"
45#endif
46#ifdef CONFIG_CIFS_SWN_UPCALL
47#include "netlink.h"
48#endif
49#include "fs_context.h"
50
51/*
52 * DOS dates from 1980/1/1 through 2107/12/31
53 * Protocol specifications indicate the range should be to 119, which
54 * limits maximum year to 2099. But this range has not been checked.
55 */
56#define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
57#define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
58#define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
59
60int cifsFYI = 0;
61bool traceSMB;
62bool enable_oplocks = true;
63bool linuxExtEnabled = true;
64bool lookupCacheEnabled = true;
65bool disable_legacy_dialects; /* false by default */
66bool enable_gcm_256 = true;
67bool require_gcm_256; /* false by default */
68bool enable_negotiate_signing; /* false by default */
69unsigned int global_secflags = CIFSSEC_DEF;
70/* unsigned int ntlmv2_support = 0; */
71unsigned int sign_CIFS_PDUs = 1;
72static const struct super_operations cifs_super_ops;
73unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
74module_param(CIFSMaxBufSize, uint, 0444);
75MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
76 "for CIFS requests. "
77 "Default: 16384 Range: 8192 to 130048");
78unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
79module_param(cifs_min_rcv, uint, 0444);
80MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
81 "1 to 64");
82unsigned int cifs_min_small = 30;
83module_param(cifs_min_small, uint, 0444);
84MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
85 "Range: 2 to 256");
86unsigned int cifs_max_pending = CIFS_MAX_REQ;
87module_param(cifs_max_pending, uint, 0444);
88MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
89 "CIFS/SMB1 dialect (N/A for SMB3) "
90 "Default: 32767 Range: 2 to 32767.");
91#ifdef CONFIG_CIFS_STATS2
92unsigned int slow_rsp_threshold = 1;
93module_param(slow_rsp_threshold, uint, 0644);
94MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
95 "before logging that a response is delayed. "
96 "Default: 1 (if set to 0 disables msg).");
97#endif /* STATS2 */
98
99module_param(enable_oplocks, bool, 0644);
100MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
101
102module_param(enable_gcm_256, bool, 0644);
103MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
104
105module_param(require_gcm_256, bool, 0644);
106MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
107
108module_param(enable_negotiate_signing, bool, 0644);
109MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
110
111module_param(disable_legacy_dialects, bool, 0644);
112MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
113 "helpful to restrict the ability to "
114 "override the default dialects (SMB2.1, "
115 "SMB3 and SMB3.02) on mount with old "
116 "dialects (CIFS/SMB1 and SMB2) since "
117 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
118 " and less secure. Default: n/N/0");
119
120extern mempool_t *cifs_sm_req_poolp;
121extern mempool_t *cifs_req_poolp;
122extern mempool_t *cifs_mid_poolp;
123
124struct workqueue_struct *cifsiod_wq;
125struct workqueue_struct *decrypt_wq;
126struct workqueue_struct *fileinfo_put_wq;
127struct workqueue_struct *cifsoplockd_wq;
128struct workqueue_struct *deferredclose_wq;
129__u32 cifs_lock_secret;
130
131/*
132 * Bumps refcount for cifs super block.
133 * Note that it should be only called if a referece to VFS super block is
134 * already held, e.g. in open-type syscalls context. Otherwise it can race with
135 * atomic_dec_and_test in deactivate_locked_super.
136 */
137void
138cifs_sb_active(struct super_block *sb)
139{
140 struct cifs_sb_info *server = CIFS_SB(sb);
141
142 if (atomic_inc_return(&server->active) == 1)
143 atomic_inc(&sb->s_active);
144}
145
146void
147cifs_sb_deactive(struct super_block *sb)
148{
149 struct cifs_sb_info *server = CIFS_SB(sb);
150
151 if (atomic_dec_and_test(&server->active))
152 deactivate_super(sb);
153}
154
155static int
156cifs_read_super(struct super_block *sb)
157{
158 struct inode *inode;
159 struct cifs_sb_info *cifs_sb;
160 struct cifs_tcon *tcon;
161 struct timespec64 ts;
162 int rc = 0;
163
164 cifs_sb = CIFS_SB(sb);
165 tcon = cifs_sb_master_tcon(cifs_sb);
166
167 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
168 sb->s_flags |= SB_POSIXACL;
169
170 if (tcon->snapshot_time)
171 sb->s_flags |= SB_RDONLY;
172
173 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
174 sb->s_maxbytes = MAX_LFS_FILESIZE;
175 else
176 sb->s_maxbytes = MAX_NON_LFS;
177
178 /*
179 * Some very old servers like DOS and OS/2 used 2 second granularity
180 * (while all current servers use 100ns granularity - see MS-DTYP)
181 * but 1 second is the maximum allowed granularity for the VFS
182 * so for old servers set time granularity to 1 second while for
183 * everything else (current servers) set it to 100ns.
184 */
185 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
186 ((tcon->ses->capabilities &
187 tcon->ses->server->vals->cap_nt_find) == 0) &&
188 !tcon->unix_ext) {
189 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
190 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
191 sb->s_time_min = ts.tv_sec;
192 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
193 cpu_to_le16(SMB_TIME_MAX), 0);
194 sb->s_time_max = ts.tv_sec;
195 } else {
196 /*
197 * Almost every server, including all SMB2+, uses DCE TIME
198 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
199 */
200 sb->s_time_gran = 100;
201 ts = cifs_NTtimeToUnix(0);
202 sb->s_time_min = ts.tv_sec;
203 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
204 sb->s_time_max = ts.tv_sec;
205 }
206
207 sb->s_magic = CIFS_MAGIC_NUMBER;
208 sb->s_op = &cifs_super_ops;
209 sb->s_xattr = cifs_xattr_handlers;
210 rc = super_setup_bdi(sb);
211 if (rc)
212 goto out_no_root;
213 /* tune readahead according to rsize if readahead size not set on mount */
214 if (cifs_sb->ctx->rasize)
215 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
216 else
217 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
218
219 sb->s_blocksize = CIFS_MAX_MSGSIZE;
220 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
221 inode = cifs_root_iget(sb);
222
223 if (IS_ERR(inode)) {
224 rc = PTR_ERR(inode);
225 goto out_no_root;
226 }
227
228 if (tcon->nocase)
229 sb->s_d_op = &cifs_ci_dentry_ops;
230 else
231 sb->s_d_op = &cifs_dentry_ops;
232
233 sb->s_root = d_make_root(inode);
234 if (!sb->s_root) {
235 rc = -ENOMEM;
236 goto out_no_root;
237 }
238
239#ifdef CONFIG_CIFS_NFSD_EXPORT
240 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
241 cifs_dbg(FYI, "export ops supported\n");
242 sb->s_export_op = &cifs_export_ops;
243 }
244#endif /* CONFIG_CIFS_NFSD_EXPORT */
245
246 return 0;
247
248out_no_root:
249 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
250 return rc;
251}
252
253static void cifs_kill_sb(struct super_block *sb)
254{
255 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
256 struct cifs_tcon *tcon;
257 struct cached_fid *cfid;
258
259 /*
260 * We ned to release all dentries for the cached directories
261 * before we kill the sb.
262 */
263 if (cifs_sb->root) {
264 dput(cifs_sb->root);
265 cifs_sb->root = NULL;
266 }
267 tcon = cifs_sb_master_tcon(cifs_sb);
268 if (tcon) {
269 cfid = &tcon->crfid;
270 mutex_lock(&cfid->fid_mutex);
271 if (cfid->dentry) {
272
273 dput(cfid->dentry);
274 cfid->dentry = NULL;
275 }
276 mutex_unlock(&cfid->fid_mutex);
277 }
278
279 kill_anon_super(sb);
280 cifs_umount(cifs_sb);
281}
282
283static int
284cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
285{
286 struct super_block *sb = dentry->d_sb;
287 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
288 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
289 struct TCP_Server_Info *server = tcon->ses->server;
290 unsigned int xid;
291 int rc = 0;
292
293 xid = get_xid();
294
295 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
296 buf->f_namelen =
297 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
298 else
299 buf->f_namelen = PATH_MAX;
300
301 buf->f_fsid.val[0] = tcon->vol_serial_number;
302 /* are using part of create time for more randomness, see man statfs */
303 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
304
305 buf->f_files = 0; /* undefined */
306 buf->f_ffree = 0; /* unlimited */
307
308 if (server->ops->queryfs)
309 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
310
311 free_xid(xid);
312 return rc;
313}
314
315static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
316{
317 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
318 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
319 struct TCP_Server_Info *server = tcon->ses->server;
320
321 if (server->ops->fallocate)
322 return server->ops->fallocate(file, tcon, mode, off, len);
323
324 return -EOPNOTSUPP;
325}
326
327static int cifs_permission(struct user_namespace *mnt_userns,
328 struct inode *inode, int mask)
329{
330 struct cifs_sb_info *cifs_sb;
331
332 cifs_sb = CIFS_SB(inode->i_sb);
333
334 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
335 if ((mask & MAY_EXEC) && !execute_ok(inode))
336 return -EACCES;
337 else
338 return 0;
339 } else /* file mode might have been restricted at mount time
340 on the client (above and beyond ACL on servers) for
341 servers which do not support setting and viewing mode bits,
342 so allowing client to check permissions is useful */
343 return generic_permission(&init_user_ns, inode, mask);
344}
345
346static struct kmem_cache *cifs_inode_cachep;
347static struct kmem_cache *cifs_req_cachep;
348static struct kmem_cache *cifs_mid_cachep;
349static struct kmem_cache *cifs_sm_req_cachep;
350mempool_t *cifs_sm_req_poolp;
351mempool_t *cifs_req_poolp;
352mempool_t *cifs_mid_poolp;
353
354static struct inode *
355cifs_alloc_inode(struct super_block *sb)
356{
357 struct cifsInodeInfo *cifs_inode;
358 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
359 if (!cifs_inode)
360 return NULL;
361 cifs_inode->cifsAttrs = 0x20; /* default */
362 cifs_inode->time = 0;
363 /*
364 * Until the file is open and we have gotten oplock info back from the
365 * server, can not assume caching of file data or metadata.
366 */
367 cifs_set_oplock_level(cifs_inode, 0);
368 cifs_inode->flags = 0;
369 spin_lock_init(&cifs_inode->writers_lock);
370 cifs_inode->writers = 0;
371 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
372 cifs_inode->server_eof = 0;
373 cifs_inode->uniqueid = 0;
374 cifs_inode->createtime = 0;
375 cifs_inode->epoch = 0;
376 spin_lock_init(&cifs_inode->open_file_lock);
377 generate_random_uuid(cifs_inode->lease_key);
378
379 /*
380 * Can not set i_flags here - they get immediately overwritten to zero
381 * by the VFS.
382 */
383 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
384 INIT_LIST_HEAD(&cifs_inode->openFileList);
385 INIT_LIST_HEAD(&cifs_inode->llist);
386 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
387 spin_lock_init(&cifs_inode->deferred_lock);
388 return &cifs_inode->vfs_inode;
389}
390
391static void
392cifs_free_inode(struct inode *inode)
393{
394 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
395}
396
397static void
398cifs_evict_inode(struct inode *inode)
399{
400 truncate_inode_pages_final(&inode->i_data);
401 clear_inode(inode);
402 cifs_fscache_release_inode_cookie(inode);
403}
404
405static void
406cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
407{
408 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
409 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
410
411 seq_puts(s, ",addr=");
412
413 switch (server->dstaddr.ss_family) {
414 case AF_INET:
415 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
416 break;
417 case AF_INET6:
418 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
419 if (sa6->sin6_scope_id)
420 seq_printf(s, "%%%u", sa6->sin6_scope_id);
421 break;
422 default:
423 seq_puts(s, "(unknown)");
424 }
425 if (server->rdma)
426 seq_puts(s, ",rdma");
427}
428
429static void
430cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
431{
432 if (ses->sectype == Unspecified) {
433 if (ses->user_name == NULL)
434 seq_puts(s, ",sec=none");
435 return;
436 }
437
438 seq_puts(s, ",sec=");
439
440 switch (ses->sectype) {
441 case LANMAN:
442 seq_puts(s, "lanman");
443 break;
444 case NTLMv2:
445 seq_puts(s, "ntlmv2");
446 break;
447 case NTLM:
448 seq_puts(s, "ntlm");
449 break;
450 case Kerberos:
451 seq_puts(s, "krb5");
452 break;
453 case RawNTLMSSP:
454 seq_puts(s, "ntlmssp");
455 break;
456 default:
457 /* shouldn't ever happen */
458 seq_puts(s, "unknown");
459 break;
460 }
461
462 if (ses->sign)
463 seq_puts(s, "i");
464
465 if (ses->sectype == Kerberos)
466 seq_printf(s, ",cruid=%u",
467 from_kuid_munged(&init_user_ns, ses->cred_uid));
468}
469
470static void
471cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
472{
473 seq_puts(s, ",cache=");
474
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
476 seq_puts(s, "strict");
477 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
478 seq_puts(s, "none");
479 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
480 seq_puts(s, "singleclient"); /* assume only one client access */
481 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
482 seq_puts(s, "ro"); /* read only caching assumed */
483 else
484 seq_puts(s, "loose");
485}
486
487/*
488 * cifs_show_devname() is used so we show the mount device name with correct
489 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
490 */
491static int cifs_show_devname(struct seq_file *m, struct dentry *root)
492{
493 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
494 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
495
496 if (devname == NULL)
497 seq_puts(m, "none");
498 else {
499 convert_delimiter(devname, '/');
500 /* escape all spaces in share names */
501 seq_escape(m, devname, " \t");
502 kfree(devname);
503 }
504 return 0;
505}
506
507/*
508 * cifs_show_options() is for displaying mount options in /proc/mounts.
509 * Not all settable options are displayed but most of the important
510 * ones are.
511 */
512static int
513cifs_show_options(struct seq_file *s, struct dentry *root)
514{
515 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
516 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
517 struct sockaddr *srcaddr;
518 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
519
520 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
521 cifs_show_security(s, tcon->ses);
522 cifs_show_cache_flavor(s, cifs_sb);
523
524 if (tcon->no_lease)
525 seq_puts(s, ",nolease");
526 if (cifs_sb->ctx->multiuser)
527 seq_puts(s, ",multiuser");
528 else if (tcon->ses->user_name)
529 seq_show_option(s, "username", tcon->ses->user_name);
530
531 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
532 seq_show_option(s, "domain", tcon->ses->domainName);
533
534 if (srcaddr->sa_family != AF_UNSPEC) {
535 struct sockaddr_in *saddr4;
536 struct sockaddr_in6 *saddr6;
537 saddr4 = (struct sockaddr_in *)srcaddr;
538 saddr6 = (struct sockaddr_in6 *)srcaddr;
539 if (srcaddr->sa_family == AF_INET6)
540 seq_printf(s, ",srcaddr=%pI6c",
541 &saddr6->sin6_addr);
542 else if (srcaddr->sa_family == AF_INET)
543 seq_printf(s, ",srcaddr=%pI4",
544 &saddr4->sin_addr.s_addr);
545 else
546 seq_printf(s, ",srcaddr=BAD-AF:%i",
547 (int)(srcaddr->sa_family));
548 }
549
550 seq_printf(s, ",uid=%u",
551 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
552 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
553 seq_puts(s, ",forceuid");
554 else
555 seq_puts(s, ",noforceuid");
556
557 seq_printf(s, ",gid=%u",
558 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
559 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
560 seq_puts(s, ",forcegid");
561 else
562 seq_puts(s, ",noforcegid");
563
564 cifs_show_address(s, tcon->ses->server);
565
566 if (!tcon->unix_ext)
567 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
568 cifs_sb->ctx->file_mode,
569 cifs_sb->ctx->dir_mode);
570 if (cifs_sb->ctx->iocharset)
571 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
572 if (tcon->seal)
573 seq_puts(s, ",seal");
574 else if (tcon->ses->server->ignore_signature)
575 seq_puts(s, ",signloosely");
576 if (tcon->nocase)
577 seq_puts(s, ",nocase");
578 if (tcon->nodelete)
579 seq_puts(s, ",nodelete");
580 if (tcon->local_lease)
581 seq_puts(s, ",locallease");
582 if (tcon->retry)
583 seq_puts(s, ",hard");
584 else
585 seq_puts(s, ",soft");
586 if (tcon->use_persistent)
587 seq_puts(s, ",persistenthandles");
588 else if (tcon->use_resilient)
589 seq_puts(s, ",resilienthandles");
590 if (tcon->posix_extensions)
591 seq_puts(s, ",posix");
592 else if (tcon->unix_ext)
593 seq_puts(s, ",unix");
594 else
595 seq_puts(s, ",nounix");
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
597 seq_puts(s, ",nodfs");
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
599 seq_puts(s, ",posixpaths");
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
601 seq_puts(s, ",setuids");
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
603 seq_puts(s, ",idsfromsid");
604 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
605 seq_puts(s, ",serverino");
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
607 seq_puts(s, ",rwpidforward");
608 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
609 seq_puts(s, ",forcemand");
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
611 seq_puts(s, ",nouser_xattr");
612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
613 seq_puts(s, ",mapchars");
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
615 seq_puts(s, ",mapposix");
616 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
617 seq_puts(s, ",sfu");
618 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
619 seq_puts(s, ",nobrl");
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
621 seq_puts(s, ",nohandlecache");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
623 seq_puts(s, ",modefromsid");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
625 seq_puts(s, ",cifsacl");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
627 seq_puts(s, ",dynperm");
628 if (root->d_sb->s_flags & SB_POSIXACL)
629 seq_puts(s, ",acl");
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
631 seq_puts(s, ",mfsymlinks");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
633 seq_puts(s, ",fsc");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
635 seq_puts(s, ",nostrictsync");
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
637 seq_puts(s, ",noperm");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
639 seq_printf(s, ",backupuid=%u",
640 from_kuid_munged(&init_user_ns,
641 cifs_sb->ctx->backupuid));
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
643 seq_printf(s, ",backupgid=%u",
644 from_kgid_munged(&init_user_ns,
645 cifs_sb->ctx->backupgid));
646
647 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
648 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
649 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
650 if (cifs_sb->ctx->rasize)
651 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
652 if (tcon->ses->server->min_offload)
653 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
654 seq_printf(s, ",echo_interval=%lu",
655 tcon->ses->server->echo_interval / HZ);
656
657 /* Only display max_credits if it was overridden on mount */
658 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
659 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
660
661 if (tcon->snapshot_time)
662 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
663 if (tcon->handle_timeout)
664 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
665
666 /*
667 * Display file and directory attribute timeout in seconds.
668 * If file and directory attribute timeout the same then actimeo
669 * was likely specified on mount
670 */
671 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
672 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
673 else {
674 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
675 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
676 }
677
678 if (tcon->ses->chan_max > 1)
679 seq_printf(s, ",multichannel,max_channels=%zu",
680 tcon->ses->chan_max);
681
682 if (tcon->use_witness)
683 seq_puts(s, ",witness");
684
685 return 0;
686}
687
688static void cifs_umount_begin(struct super_block *sb)
689{
690 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
691 struct cifs_tcon *tcon;
692
693 if (cifs_sb == NULL)
694 return;
695
696 tcon = cifs_sb_master_tcon(cifs_sb);
697
698 spin_lock(&cifs_tcp_ses_lock);
699 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
700 /* we have other mounts to same share or we have
701 already tried to force umount this and woken up
702 all waiting network requests, nothing to do */
703 spin_unlock(&cifs_tcp_ses_lock);
704 return;
705 } else if (tcon->tc_count == 1)
706 tcon->tidStatus = CifsExiting;
707 spin_unlock(&cifs_tcp_ses_lock);
708
709 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
710 /* cancel_notify_requests(tcon); */
711 if (tcon->ses && tcon->ses->server) {
712 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
713 wake_up_all(&tcon->ses->server->request_q);
714 wake_up_all(&tcon->ses->server->response_q);
715 msleep(1); /* yield */
716 /* we have to kick the requests once more */
717 wake_up_all(&tcon->ses->server->response_q);
718 msleep(1);
719 }
720
721 return;
722}
723
724#ifdef CONFIG_CIFS_STATS2
725static int cifs_show_stats(struct seq_file *s, struct dentry *root)
726{
727 /* BB FIXME */
728 return 0;
729}
730#endif
731
732static int cifs_drop_inode(struct inode *inode)
733{
734 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
735
736 /* no serverino => unconditional eviction */
737 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
738 generic_drop_inode(inode);
739}
740
741static const struct super_operations cifs_super_ops = {
742 .statfs = cifs_statfs,
743 .alloc_inode = cifs_alloc_inode,
744 .free_inode = cifs_free_inode,
745 .drop_inode = cifs_drop_inode,
746 .evict_inode = cifs_evict_inode,
747/* .show_path = cifs_show_path, */ /* Would we ever need show path? */
748 .show_devname = cifs_show_devname,
749/* .delete_inode = cifs_delete_inode, */ /* Do not need above
750 function unless later we add lazy close of inodes or unless the
751 kernel forgets to call us with the same number of releases (closes)
752 as opens */
753 .show_options = cifs_show_options,
754 .umount_begin = cifs_umount_begin,
755#ifdef CONFIG_CIFS_STATS2
756 .show_stats = cifs_show_stats,
757#endif
758};
759
760/*
761 * Get root dentry from superblock according to prefix path mount option.
762 * Return dentry with refcount + 1 on success and NULL otherwise.
763 */
764static struct dentry *
765cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
766{
767 struct dentry *dentry;
768 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
769 char *full_path = NULL;
770 char *s, *p;
771 char sep;
772
773 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
774 return dget(sb->s_root);
775
776 full_path = cifs_build_path_to_root(ctx, cifs_sb,
777 cifs_sb_master_tcon(cifs_sb), 0);
778 if (full_path == NULL)
779 return ERR_PTR(-ENOMEM);
780
781 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
782
783 sep = CIFS_DIR_SEP(cifs_sb);
784 dentry = dget(sb->s_root);
785 p = s = full_path;
786
787 do {
788 struct inode *dir = d_inode(dentry);
789 struct dentry *child;
790
791 if (!S_ISDIR(dir->i_mode)) {
792 dput(dentry);
793 dentry = ERR_PTR(-ENOTDIR);
794 break;
795 }
796
797 /* skip separators */
798 while (*s == sep)
799 s++;
800 if (!*s)
801 break;
802 p = s++;
803 /* next separator */
804 while (*s && *s != sep)
805 s++;
806
807 child = lookup_positive_unlocked(p, dentry, s - p);
808 dput(dentry);
809 dentry = child;
810 } while (!IS_ERR(dentry));
811 kfree(full_path);
812 return dentry;
813}
814
815static int cifs_set_super(struct super_block *sb, void *data)
816{
817 struct cifs_mnt_data *mnt_data = data;
818 sb->s_fs_info = mnt_data->cifs_sb;
819 return set_anon_super(sb, NULL);
820}
821
822struct dentry *
823cifs_smb3_do_mount(struct file_system_type *fs_type,
824 int flags, struct smb3_fs_context *old_ctx)
825{
826 int rc;
827 struct super_block *sb;
828 struct cifs_sb_info *cifs_sb = NULL;
829 struct cifs_mnt_data mnt_data;
830 struct dentry *root;
831
832 /*
833 * Prints in Kernel / CIFS log the attempted mount operation
834 * If CIFS_DEBUG && cifs_FYI
835 */
836 if (cifsFYI)
837 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
838 else
839 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
840
841 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
842 if (cifs_sb == NULL) {
843 root = ERR_PTR(-ENOMEM);
844 goto out;
845 }
846
847 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
848 if (!cifs_sb->ctx) {
849 root = ERR_PTR(-ENOMEM);
850 goto out;
851 }
852 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
853 if (rc) {
854 root = ERR_PTR(rc);
855 goto out;
856 }
857
858 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
859 if (rc) {
860 root = ERR_PTR(rc);
861 goto out;
862 }
863
864 rc = cifs_setup_cifs_sb(cifs_sb);
865 if (rc) {
866 root = ERR_PTR(rc);
867 goto out;
868 }
869
870 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
871 if (rc) {
872 if (!(flags & SB_SILENT))
873 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
874 rc);
875 root = ERR_PTR(rc);
876 goto out;
877 }
878
879 mnt_data.ctx = cifs_sb->ctx;
880 mnt_data.cifs_sb = cifs_sb;
881 mnt_data.flags = flags;
882
883 /* BB should we make this contingent on mount parm? */
884 flags |= SB_NODIRATIME | SB_NOATIME;
885
886 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
887 if (IS_ERR(sb)) {
888 root = ERR_CAST(sb);
889 cifs_umount(cifs_sb);
890 cifs_sb = NULL;
891 goto out;
892 }
893
894 if (sb->s_root) {
895 cifs_dbg(FYI, "Use existing superblock\n");
896 cifs_umount(cifs_sb);
897 cifs_sb = NULL;
898 } else {
899 rc = cifs_read_super(sb);
900 if (rc) {
901 root = ERR_PTR(rc);
902 goto out_super;
903 }
904
905 sb->s_flags |= SB_ACTIVE;
906 }
907
908 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
909 if (IS_ERR(root))
910 goto out_super;
911
912 if (cifs_sb)
913 cifs_sb->root = dget(root);
914
915 cifs_dbg(FYI, "dentry root is: %p\n", root);
916 return root;
917
918out_super:
919 deactivate_locked_super(sb);
920out:
921 if (cifs_sb) {
922 kfree(cifs_sb->prepath);
923 smb3_cleanup_fs_context(cifs_sb->ctx);
924 kfree(cifs_sb);
925 }
926 return root;
927}
928
929
930static ssize_t
931cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
932{
933 ssize_t rc;
934 struct inode *inode = file_inode(iocb->ki_filp);
935
936 if (iocb->ki_filp->f_flags & O_DIRECT)
937 return cifs_user_readv(iocb, iter);
938
939 rc = cifs_revalidate_mapping(inode);
940 if (rc)
941 return rc;
942
943 return generic_file_read_iter(iocb, iter);
944}
945
946static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
947{
948 struct inode *inode = file_inode(iocb->ki_filp);
949 struct cifsInodeInfo *cinode = CIFS_I(inode);
950 ssize_t written;
951 int rc;
952
953 if (iocb->ki_filp->f_flags & O_DIRECT) {
954 written = cifs_user_writev(iocb, from);
955 if (written > 0 && CIFS_CACHE_READ(cinode)) {
956 cifs_zap_mapping(inode);
957 cifs_dbg(FYI,
958 "Set no oplock for inode=%p after a write operation\n",
959 inode);
960 cinode->oplock = 0;
961 }
962 return written;
963 }
964
965 written = cifs_get_writer(cinode);
966 if (written)
967 return written;
968
969 written = generic_file_write_iter(iocb, from);
970
971 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
972 goto out;
973
974 rc = filemap_fdatawrite(inode->i_mapping);
975 if (rc)
976 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
977 rc, inode);
978
979out:
980 cifs_put_writer(cinode);
981 return written;
982}
983
984static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
985{
986 struct cifsFileInfo *cfile = file->private_data;
987 struct cifs_tcon *tcon;
988
989 /*
990 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
991 * the cached file length
992 */
993 if (whence != SEEK_SET && whence != SEEK_CUR) {
994 int rc;
995 struct inode *inode = file_inode(file);
996
997 /*
998 * We need to be sure that all dirty pages are written and the
999 * server has the newest file length.
1000 */
1001 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1002 inode->i_mapping->nrpages != 0) {
1003 rc = filemap_fdatawait(inode->i_mapping);
1004 if (rc) {
1005 mapping_set_error(inode->i_mapping, rc);
1006 return rc;
1007 }
1008 }
1009 /*
1010 * Some applications poll for the file length in this strange
1011 * way so we must seek to end on non-oplocked files by
1012 * setting the revalidate time to zero.
1013 */
1014 CIFS_I(inode)->time = 0;
1015
1016 rc = cifs_revalidate_file_attr(file);
1017 if (rc < 0)
1018 return (loff_t)rc;
1019 }
1020 if (cfile && cfile->tlink) {
1021 tcon = tlink_tcon(cfile->tlink);
1022 if (tcon->ses->server->ops->llseek)
1023 return tcon->ses->server->ops->llseek(file, tcon,
1024 offset, whence);
1025 }
1026 return generic_file_llseek(file, offset, whence);
1027}
1028
1029static int
1030cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1031{
1032 /*
1033 * Note that this is called by vfs setlease with i_lock held to
1034 * protect *lease from going away.
1035 */
1036 struct inode *inode = file_inode(file);
1037 struct cifsFileInfo *cfile = file->private_data;
1038
1039 if (!(S_ISREG(inode->i_mode)))
1040 return -EINVAL;
1041
1042 /* Check if file is oplocked if this is request for new lease */
1043 if (arg == F_UNLCK ||
1044 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1045 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1046 return generic_setlease(file, arg, lease, priv);
1047 else if (tlink_tcon(cfile->tlink)->local_lease &&
1048 !CIFS_CACHE_READ(CIFS_I(inode)))
1049 /*
1050 * If the server claims to support oplock on this file, then we
1051 * still need to check oplock even if the local_lease mount
1052 * option is set, but there are servers which do not support
1053 * oplock for which this mount option may be useful if the user
1054 * knows that the file won't be changed on the server by anyone
1055 * else.
1056 */
1057 return generic_setlease(file, arg, lease, priv);
1058 else
1059 return -EAGAIN;
1060}
1061
1062struct file_system_type cifs_fs_type = {
1063 .owner = THIS_MODULE,
1064 .name = "cifs",
1065 .init_fs_context = smb3_init_fs_context,
1066 .parameters = smb3_fs_parameters,
1067 .kill_sb = cifs_kill_sb,
1068 .fs_flags = FS_RENAME_DOES_D_MOVE,
1069};
1070MODULE_ALIAS_FS("cifs");
1071
1072static struct file_system_type smb3_fs_type = {
1073 .owner = THIS_MODULE,
1074 .name = "smb3",
1075 .init_fs_context = smb3_init_fs_context,
1076 .parameters = smb3_fs_parameters,
1077 .kill_sb = cifs_kill_sb,
1078 .fs_flags = FS_RENAME_DOES_D_MOVE,
1079};
1080MODULE_ALIAS_FS("smb3");
1081MODULE_ALIAS("smb3");
1082
1083const struct inode_operations cifs_dir_inode_ops = {
1084 .create = cifs_create,
1085 .atomic_open = cifs_atomic_open,
1086 .lookup = cifs_lookup,
1087 .getattr = cifs_getattr,
1088 .unlink = cifs_unlink,
1089 .link = cifs_hardlink,
1090 .mkdir = cifs_mkdir,
1091 .rmdir = cifs_rmdir,
1092 .rename = cifs_rename2,
1093 .permission = cifs_permission,
1094 .setattr = cifs_setattr,
1095 .symlink = cifs_symlink,
1096 .mknod = cifs_mknod,
1097 .listxattr = cifs_listxattr,
1098};
1099
1100const struct inode_operations cifs_file_inode_ops = {
1101 .setattr = cifs_setattr,
1102 .getattr = cifs_getattr,
1103 .permission = cifs_permission,
1104 .listxattr = cifs_listxattr,
1105 .fiemap = cifs_fiemap,
1106};
1107
1108const struct inode_operations cifs_symlink_inode_ops = {
1109 .get_link = cifs_get_link,
1110 .permission = cifs_permission,
1111 .listxattr = cifs_listxattr,
1112};
1113
1114static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1115 struct file *dst_file, loff_t destoff, loff_t len,
1116 unsigned int remap_flags)
1117{
1118 struct inode *src_inode = file_inode(src_file);
1119 struct inode *target_inode = file_inode(dst_file);
1120 struct cifsFileInfo *smb_file_src = src_file->private_data;
1121 struct cifsFileInfo *smb_file_target;
1122 struct cifs_tcon *target_tcon;
1123 unsigned int xid;
1124 int rc;
1125
1126 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1127 return -EINVAL;
1128
1129 cifs_dbg(FYI, "clone range\n");
1130
1131 xid = get_xid();
1132
1133 if (!src_file->private_data || !dst_file->private_data) {
1134 rc = -EBADF;
1135 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1136 goto out;
1137 }
1138
1139 smb_file_target = dst_file->private_data;
1140 target_tcon = tlink_tcon(smb_file_target->tlink);
1141
1142 /*
1143 * Note: cifs case is easier than btrfs since server responsible for
1144 * checks for proper open modes and file type and if it wants
1145 * server could even support copy of range where source = target
1146 */
1147 lock_two_nondirectories(target_inode, src_inode);
1148
1149 if (len == 0)
1150 len = src_inode->i_size - off;
1151
1152 cifs_dbg(FYI, "about to flush pages\n");
1153 /* should we flush first and last page first */
1154 truncate_inode_pages_range(&target_inode->i_data, destoff,
1155 PAGE_ALIGN(destoff + len)-1);
1156
1157 if (target_tcon->ses->server->ops->duplicate_extents)
1158 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1159 smb_file_src, smb_file_target, off, len, destoff);
1160 else
1161 rc = -EOPNOTSUPP;
1162
1163 /* force revalidate of size and timestamps of target file now
1164 that target is updated on the server */
1165 CIFS_I(target_inode)->time = 0;
1166 /* although unlocking in the reverse order from locking is not
1167 strictly necessary here it is a little cleaner to be consistent */
1168 unlock_two_nondirectories(src_inode, target_inode);
1169out:
1170 free_xid(xid);
1171 return rc < 0 ? rc : len;
1172}
1173
1174ssize_t cifs_file_copychunk_range(unsigned int xid,
1175 struct file *src_file, loff_t off,
1176 struct file *dst_file, loff_t destoff,
1177 size_t len, unsigned int flags)
1178{
1179 struct inode *src_inode = file_inode(src_file);
1180 struct inode *target_inode = file_inode(dst_file);
1181 struct cifsFileInfo *smb_file_src;
1182 struct cifsFileInfo *smb_file_target;
1183 struct cifs_tcon *src_tcon;
1184 struct cifs_tcon *target_tcon;
1185 ssize_t rc;
1186
1187 cifs_dbg(FYI, "copychunk range\n");
1188
1189 if (!src_file->private_data || !dst_file->private_data) {
1190 rc = -EBADF;
1191 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1192 goto out;
1193 }
1194
1195 rc = -EXDEV;
1196 smb_file_target = dst_file->private_data;
1197 smb_file_src = src_file->private_data;
1198 src_tcon = tlink_tcon(smb_file_src->tlink);
1199 target_tcon = tlink_tcon(smb_file_target->tlink);
1200
1201 if (src_tcon->ses != target_tcon->ses) {
1202 cifs_dbg(VFS, "source and target of copy not on same server\n");
1203 goto out;
1204 }
1205
1206 rc = -EOPNOTSUPP;
1207 if (!target_tcon->ses->server->ops->copychunk_range)
1208 goto out;
1209
1210 /*
1211 * Note: cifs case is easier than btrfs since server responsible for
1212 * checks for proper open modes and file type and if it wants
1213 * server could even support copy of range where source = target
1214 */
1215 lock_two_nondirectories(target_inode, src_inode);
1216
1217 cifs_dbg(FYI, "about to flush pages\n");
1218 /* should we flush first and last page first */
1219 truncate_inode_pages(&target_inode->i_data, 0);
1220
1221 rc = file_modified(dst_file);
1222 if (!rc)
1223 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1224 smb_file_src, smb_file_target, off, len, destoff);
1225
1226 file_accessed(src_file);
1227
1228 /* force revalidate of size and timestamps of target file now
1229 * that target is updated on the server
1230 */
1231 CIFS_I(target_inode)->time = 0;
1232 /* although unlocking in the reverse order from locking is not
1233 * strictly necessary here it is a little cleaner to be consistent
1234 */
1235 unlock_two_nondirectories(src_inode, target_inode);
1236
1237out:
1238 return rc;
1239}
1240
1241/*
1242 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1243 * is a dummy operation.
1244 */
1245static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1246{
1247 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1248 file, datasync);
1249
1250 return 0;
1251}
1252
1253static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1254 struct file *dst_file, loff_t destoff,
1255 size_t len, unsigned int flags)
1256{
1257 unsigned int xid = get_xid();
1258 ssize_t rc;
1259 struct cifsFileInfo *cfile = dst_file->private_data;
1260
1261 if (cfile->swapfile)
1262 return -EOPNOTSUPP;
1263
1264 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1265 len, flags);
1266 free_xid(xid);
1267
1268 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1269 rc = generic_copy_file_range(src_file, off, dst_file,
1270 destoff, len, flags);
1271 return rc;
1272}
1273
1274const struct file_operations cifs_file_ops = {
1275 .read_iter = cifs_loose_read_iter,
1276 .write_iter = cifs_file_write_iter,
1277 .open = cifs_open,
1278 .release = cifs_close,
1279 .lock = cifs_lock,
1280 .flock = cifs_flock,
1281 .fsync = cifs_fsync,
1282 .flush = cifs_flush,
1283 .mmap = cifs_file_mmap,
1284 .splice_read = generic_file_splice_read,
1285 .splice_write = iter_file_splice_write,
1286 .llseek = cifs_llseek,
1287 .unlocked_ioctl = cifs_ioctl,
1288 .copy_file_range = cifs_copy_file_range,
1289 .remap_file_range = cifs_remap_file_range,
1290 .setlease = cifs_setlease,
1291 .fallocate = cifs_fallocate,
1292};
1293
1294const struct file_operations cifs_file_strict_ops = {
1295 .read_iter = cifs_strict_readv,
1296 .write_iter = cifs_strict_writev,
1297 .open = cifs_open,
1298 .release = cifs_close,
1299 .lock = cifs_lock,
1300 .flock = cifs_flock,
1301 .fsync = cifs_strict_fsync,
1302 .flush = cifs_flush,
1303 .mmap = cifs_file_strict_mmap,
1304 .splice_read = generic_file_splice_read,
1305 .splice_write = iter_file_splice_write,
1306 .llseek = cifs_llseek,
1307 .unlocked_ioctl = cifs_ioctl,
1308 .copy_file_range = cifs_copy_file_range,
1309 .remap_file_range = cifs_remap_file_range,
1310 .setlease = cifs_setlease,
1311 .fallocate = cifs_fallocate,
1312};
1313
1314const struct file_operations cifs_file_direct_ops = {
1315 .read_iter = cifs_direct_readv,
1316 .write_iter = cifs_direct_writev,
1317 .open = cifs_open,
1318 .release = cifs_close,
1319 .lock = cifs_lock,
1320 .flock = cifs_flock,
1321 .fsync = cifs_fsync,
1322 .flush = cifs_flush,
1323 .mmap = cifs_file_mmap,
1324 .splice_read = generic_file_splice_read,
1325 .splice_write = iter_file_splice_write,
1326 .unlocked_ioctl = cifs_ioctl,
1327 .copy_file_range = cifs_copy_file_range,
1328 .remap_file_range = cifs_remap_file_range,
1329 .llseek = cifs_llseek,
1330 .setlease = cifs_setlease,
1331 .fallocate = cifs_fallocate,
1332};
1333
1334const struct file_operations cifs_file_nobrl_ops = {
1335 .read_iter = cifs_loose_read_iter,
1336 .write_iter = cifs_file_write_iter,
1337 .open = cifs_open,
1338 .release = cifs_close,
1339 .fsync = cifs_fsync,
1340 .flush = cifs_flush,
1341 .mmap = cifs_file_mmap,
1342 .splice_read = generic_file_splice_read,
1343 .splice_write = iter_file_splice_write,
1344 .llseek = cifs_llseek,
1345 .unlocked_ioctl = cifs_ioctl,
1346 .copy_file_range = cifs_copy_file_range,
1347 .remap_file_range = cifs_remap_file_range,
1348 .setlease = cifs_setlease,
1349 .fallocate = cifs_fallocate,
1350};
1351
1352const struct file_operations cifs_file_strict_nobrl_ops = {
1353 .read_iter = cifs_strict_readv,
1354 .write_iter = cifs_strict_writev,
1355 .open = cifs_open,
1356 .release = cifs_close,
1357 .fsync = cifs_strict_fsync,
1358 .flush = cifs_flush,
1359 .mmap = cifs_file_strict_mmap,
1360 .splice_read = generic_file_splice_read,
1361 .splice_write = iter_file_splice_write,
1362 .llseek = cifs_llseek,
1363 .unlocked_ioctl = cifs_ioctl,
1364 .copy_file_range = cifs_copy_file_range,
1365 .remap_file_range = cifs_remap_file_range,
1366 .setlease = cifs_setlease,
1367 .fallocate = cifs_fallocate,
1368};
1369
1370const struct file_operations cifs_file_direct_nobrl_ops = {
1371 .read_iter = cifs_direct_readv,
1372 .write_iter = cifs_direct_writev,
1373 .open = cifs_open,
1374 .release = cifs_close,
1375 .fsync = cifs_fsync,
1376 .flush = cifs_flush,
1377 .mmap = cifs_file_mmap,
1378 .splice_read = generic_file_splice_read,
1379 .splice_write = iter_file_splice_write,
1380 .unlocked_ioctl = cifs_ioctl,
1381 .copy_file_range = cifs_copy_file_range,
1382 .remap_file_range = cifs_remap_file_range,
1383 .llseek = cifs_llseek,
1384 .setlease = cifs_setlease,
1385 .fallocate = cifs_fallocate,
1386};
1387
1388const struct file_operations cifs_dir_ops = {
1389 .iterate_shared = cifs_readdir,
1390 .release = cifs_closedir,
1391 .read = generic_read_dir,
1392 .unlocked_ioctl = cifs_ioctl,
1393 .copy_file_range = cifs_copy_file_range,
1394 .remap_file_range = cifs_remap_file_range,
1395 .llseek = generic_file_llseek,
1396 .fsync = cifs_dir_fsync,
1397};
1398
1399static void
1400cifs_init_once(void *inode)
1401{
1402 struct cifsInodeInfo *cifsi = inode;
1403
1404 inode_init_once(&cifsi->vfs_inode);
1405 init_rwsem(&cifsi->lock_sem);
1406}
1407
1408static int __init
1409cifs_init_inodecache(void)
1410{
1411 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1412 sizeof(struct cifsInodeInfo),
1413 0, (SLAB_RECLAIM_ACCOUNT|
1414 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1415 cifs_init_once);
1416 if (cifs_inode_cachep == NULL)
1417 return -ENOMEM;
1418
1419 return 0;
1420}
1421
1422static void
1423cifs_destroy_inodecache(void)
1424{
1425 /*
1426 * Make sure all delayed rcu free inodes are flushed before we
1427 * destroy cache.
1428 */
1429 rcu_barrier();
1430 kmem_cache_destroy(cifs_inode_cachep);
1431}
1432
1433static int
1434cifs_init_request_bufs(void)
1435{
1436 /*
1437 * SMB2 maximum header size is bigger than CIFS one - no problems to
1438 * allocate some more bytes for CIFS.
1439 */
1440 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1441
1442 if (CIFSMaxBufSize < 8192) {
1443 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1444 Unicode path name has to fit in any SMB/CIFS path based frames */
1445 CIFSMaxBufSize = 8192;
1446 } else if (CIFSMaxBufSize > 1024*127) {
1447 CIFSMaxBufSize = 1024 * 127;
1448 } else {
1449 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1450 }
1451/*
1452 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1453 CIFSMaxBufSize, CIFSMaxBufSize);
1454*/
1455 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1456 CIFSMaxBufSize + max_hdr_size, 0,
1457 SLAB_HWCACHE_ALIGN, 0,
1458 CIFSMaxBufSize + max_hdr_size,
1459 NULL);
1460 if (cifs_req_cachep == NULL)
1461 return -ENOMEM;
1462
1463 if (cifs_min_rcv < 1)
1464 cifs_min_rcv = 1;
1465 else if (cifs_min_rcv > 64) {
1466 cifs_min_rcv = 64;
1467 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1468 }
1469
1470 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1471 cifs_req_cachep);
1472
1473 if (cifs_req_poolp == NULL) {
1474 kmem_cache_destroy(cifs_req_cachep);
1475 return -ENOMEM;
1476 }
1477 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1478 almost all handle based requests (but not write response, nor is it
1479 sufficient for path based requests). A smaller size would have
1480 been more efficient (compacting multiple slab items on one 4k page)
1481 for the case in which debug was on, but this larger size allows
1482 more SMBs to use small buffer alloc and is still much more
1483 efficient to alloc 1 per page off the slab compared to 17K (5page)
1484 alloc of large cifs buffers even when page debugging is on */
1485 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1486 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1487 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1488 if (cifs_sm_req_cachep == NULL) {
1489 mempool_destroy(cifs_req_poolp);
1490 kmem_cache_destroy(cifs_req_cachep);
1491 return -ENOMEM;
1492 }
1493
1494 if (cifs_min_small < 2)
1495 cifs_min_small = 2;
1496 else if (cifs_min_small > 256) {
1497 cifs_min_small = 256;
1498 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1499 }
1500
1501 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1502 cifs_sm_req_cachep);
1503
1504 if (cifs_sm_req_poolp == NULL) {
1505 mempool_destroy(cifs_req_poolp);
1506 kmem_cache_destroy(cifs_req_cachep);
1507 kmem_cache_destroy(cifs_sm_req_cachep);
1508 return -ENOMEM;
1509 }
1510
1511 return 0;
1512}
1513
1514static void
1515cifs_destroy_request_bufs(void)
1516{
1517 mempool_destroy(cifs_req_poolp);
1518 kmem_cache_destroy(cifs_req_cachep);
1519 mempool_destroy(cifs_sm_req_poolp);
1520 kmem_cache_destroy(cifs_sm_req_cachep);
1521}
1522
1523static int
1524cifs_init_mids(void)
1525{
1526 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1527 sizeof(struct mid_q_entry), 0,
1528 SLAB_HWCACHE_ALIGN, NULL);
1529 if (cifs_mid_cachep == NULL)
1530 return -ENOMEM;
1531
1532 /* 3 is a reasonable minimum number of simultaneous operations */
1533 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1534 if (cifs_mid_poolp == NULL) {
1535 kmem_cache_destroy(cifs_mid_cachep);
1536 return -ENOMEM;
1537 }
1538
1539 return 0;
1540}
1541
1542static void
1543cifs_destroy_mids(void)
1544{
1545 mempool_destroy(cifs_mid_poolp);
1546 kmem_cache_destroy(cifs_mid_cachep);
1547}
1548
1549static int __init
1550init_cifs(void)
1551{
1552 int rc = 0;
1553 cifs_proc_init();
1554 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1555/*
1556 * Initialize Global counters
1557 */
1558 atomic_set(&sesInfoAllocCount, 0);
1559 atomic_set(&tconInfoAllocCount, 0);
1560 atomic_set(&tcpSesNextId, 0);
1561 atomic_set(&tcpSesAllocCount, 0);
1562 atomic_set(&tcpSesReconnectCount, 0);
1563 atomic_set(&tconInfoReconnectCount, 0);
1564
1565 atomic_set(&bufAllocCount, 0);
1566 atomic_set(&smBufAllocCount, 0);
1567#ifdef CONFIG_CIFS_STATS2
1568 atomic_set(&totBufAllocCount, 0);
1569 atomic_set(&totSmBufAllocCount, 0);
1570 if (slow_rsp_threshold < 1)
1571 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1572 else if (slow_rsp_threshold > 32767)
1573 cifs_dbg(VFS,
1574 "slow response threshold set higher than recommended (0 to 32767)\n");
1575#endif /* CONFIG_CIFS_STATS2 */
1576
1577 atomic_set(&midCount, 0);
1578 GlobalCurrentXid = 0;
1579 GlobalTotalActiveXid = 0;
1580 GlobalMaxActiveXid = 0;
1581 spin_lock_init(&cifs_tcp_ses_lock);
1582 spin_lock_init(&GlobalMid_Lock);
1583
1584 cifs_lock_secret = get_random_u32();
1585
1586 if (cifs_max_pending < 2) {
1587 cifs_max_pending = 2;
1588 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1589 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1590 cifs_max_pending = CIFS_MAX_REQ;
1591 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1592 CIFS_MAX_REQ);
1593 }
1594
1595 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1596 if (!cifsiod_wq) {
1597 rc = -ENOMEM;
1598 goto out_clean_proc;
1599 }
1600
1601 /*
1602 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1603 * so that we don't launch too many worker threads but
1604 * Documentation/core-api/workqueue.rst recommends setting it to 0
1605 */
1606
1607 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1608 decrypt_wq = alloc_workqueue("smb3decryptd",
1609 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1610 if (!decrypt_wq) {
1611 rc = -ENOMEM;
1612 goto out_destroy_cifsiod_wq;
1613 }
1614
1615 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1616 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1617 if (!fileinfo_put_wq) {
1618 rc = -ENOMEM;
1619 goto out_destroy_decrypt_wq;
1620 }
1621
1622 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1623 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1624 if (!cifsoplockd_wq) {
1625 rc = -ENOMEM;
1626 goto out_destroy_fileinfo_put_wq;
1627 }
1628
1629 deferredclose_wq = alloc_workqueue("deferredclose",
1630 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1631 if (!deferredclose_wq) {
1632 rc = -ENOMEM;
1633 goto out_destroy_cifsoplockd_wq;
1634 }
1635
1636 rc = cifs_fscache_register();
1637 if (rc)
1638 goto out_destroy_deferredclose_wq;
1639
1640 rc = cifs_init_inodecache();
1641 if (rc)
1642 goto out_unreg_fscache;
1643
1644 rc = cifs_init_mids();
1645 if (rc)
1646 goto out_destroy_inodecache;
1647
1648 rc = cifs_init_request_bufs();
1649 if (rc)
1650 goto out_destroy_mids;
1651
1652#ifdef CONFIG_CIFS_DFS_UPCALL
1653 rc = dfs_cache_init();
1654 if (rc)
1655 goto out_destroy_request_bufs;
1656#endif /* CONFIG_CIFS_DFS_UPCALL */
1657#ifdef CONFIG_CIFS_UPCALL
1658 rc = init_cifs_spnego();
1659 if (rc)
1660 goto out_destroy_dfs_cache;
1661#endif /* CONFIG_CIFS_UPCALL */
1662#ifdef CONFIG_CIFS_SWN_UPCALL
1663 rc = cifs_genl_init();
1664 if (rc)
1665 goto out_register_key_type;
1666#endif /* CONFIG_CIFS_SWN_UPCALL */
1667
1668 rc = init_cifs_idmap();
1669 if (rc)
1670 goto out_cifs_swn_init;
1671
1672 rc = register_filesystem(&cifs_fs_type);
1673 if (rc)
1674 goto out_init_cifs_idmap;
1675
1676 rc = register_filesystem(&smb3_fs_type);
1677 if (rc) {
1678 unregister_filesystem(&cifs_fs_type);
1679 goto out_init_cifs_idmap;
1680 }
1681
1682 return 0;
1683
1684out_init_cifs_idmap:
1685 exit_cifs_idmap();
1686out_cifs_swn_init:
1687#ifdef CONFIG_CIFS_SWN_UPCALL
1688 cifs_genl_exit();
1689out_register_key_type:
1690#endif
1691#ifdef CONFIG_CIFS_UPCALL
1692 exit_cifs_spnego();
1693out_destroy_dfs_cache:
1694#endif
1695#ifdef CONFIG_CIFS_DFS_UPCALL
1696 dfs_cache_destroy();
1697out_destroy_request_bufs:
1698#endif
1699 cifs_destroy_request_bufs();
1700out_destroy_mids:
1701 cifs_destroy_mids();
1702out_destroy_inodecache:
1703 cifs_destroy_inodecache();
1704out_unreg_fscache:
1705 cifs_fscache_unregister();
1706out_destroy_deferredclose_wq:
1707 destroy_workqueue(deferredclose_wq);
1708out_destroy_cifsoplockd_wq:
1709 destroy_workqueue(cifsoplockd_wq);
1710out_destroy_fileinfo_put_wq:
1711 destroy_workqueue(fileinfo_put_wq);
1712out_destroy_decrypt_wq:
1713 destroy_workqueue(decrypt_wq);
1714out_destroy_cifsiod_wq:
1715 destroy_workqueue(cifsiod_wq);
1716out_clean_proc:
1717 cifs_proc_clean();
1718 return rc;
1719}
1720
1721static void __exit
1722exit_cifs(void)
1723{
1724 cifs_dbg(NOISY, "exit_smb3\n");
1725 unregister_filesystem(&cifs_fs_type);
1726 unregister_filesystem(&smb3_fs_type);
1727 cifs_dfs_release_automount_timer();
1728 exit_cifs_idmap();
1729#ifdef CONFIG_CIFS_SWN_UPCALL
1730 cifs_genl_exit();
1731#endif
1732#ifdef CONFIG_CIFS_UPCALL
1733 exit_cifs_spnego();
1734#endif
1735#ifdef CONFIG_CIFS_DFS_UPCALL
1736 dfs_cache_destroy();
1737#endif
1738 cifs_destroy_request_bufs();
1739 cifs_destroy_mids();
1740 cifs_destroy_inodecache();
1741 cifs_fscache_unregister();
1742 destroy_workqueue(deferredclose_wq);
1743 destroy_workqueue(cifsoplockd_wq);
1744 destroy_workqueue(decrypt_wq);
1745 destroy_workqueue(fileinfo_put_wq);
1746 destroy_workqueue(cifsiod_wq);
1747 cifs_proc_clean();
1748}
1749
1750MODULE_AUTHOR("Steve French");
1751MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1752MODULE_DESCRIPTION
1753 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1754 "also older servers complying with the SNIA CIFS Specification)");
1755MODULE_VERSION(CIFS_VERSION);
1756MODULE_SOFTDEP("ecb");
1757MODULE_SOFTDEP("hmac");
1758MODULE_SOFTDEP("md4");
1759MODULE_SOFTDEP("md5");
1760MODULE_SOFTDEP("nls");
1761MODULE_SOFTDEP("aes");
1762MODULE_SOFTDEP("cmac");
1763MODULE_SOFTDEP("sha256");
1764MODULE_SOFTDEP("sha512");
1765MODULE_SOFTDEP("aead2");
1766MODULE_SOFTDEP("ccm");
1767MODULE_SOFTDEP("gcm");
1768module_init(init_cifs)
1769module_exit(exit_cifs)