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 <linux/random.h>
40 #include <linux/uuid.h>
41 #include <linux/xattr.h>
42 #include <net/ipv6.h>
43 #include "cifsfs.h"
44 #include "cifspdu.h"
45 #define DECLARE_GLOBALS_HERE
46 #include "cifsglob.h"
47 #include "cifsproto.h"
48 #include "cifs_debug.h"
49 #include "cifs_fs_sb.h"
50 #include <linux/mm.h>
51 #include <linux/key-type.h>
52 #include "cifs_spnego.h"
53 #include "fscache.h"
54 #include "smb2pdu.h"
55 #ifdef CONFIG_CIFS_DFS_UPCALL
56 #include "dfs_cache.h"
57 #endif
58
59 /*
60 * DOS dates from 1980/1/1 through 2107/12/31
61 * Protocol specifications indicate the range should be to 119, which
62 * limits maximum year to 2099. But this range has not been checked.
63 */
64 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
65 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
66 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
67
68 int cifsFYI = 0;
69 bool traceSMB;
70 bool enable_oplocks = true;
71 bool linuxExtEnabled = true;
72 bool lookupCacheEnabled = true;
73 bool disable_legacy_dialects; /* false by default */
74 bool enable_gcm_256; /* false by default, change when more servers support it */
75 bool require_gcm_256; /* false by default */
76 unsigned int global_secflags = CIFSSEC_DEF;
77 /* unsigned int ntlmv2_support = 0; */
78 unsigned int sign_CIFS_PDUs = 1;
79 static const struct super_operations cifs_super_ops;
80 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
81 module_param(CIFSMaxBufSize, uint, 0444);
82 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
83 "for CIFS requests. "
84 "Default: 16384 Range: 8192 to 130048");
85 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
86 module_param(cifs_min_rcv, uint, 0444);
87 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
88 "1 to 64");
89 unsigned int cifs_min_small = 30;
90 module_param(cifs_min_small, uint, 0444);
91 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
92 "Range: 2 to 256");
93 unsigned int cifs_max_pending = CIFS_MAX_REQ;
94 module_param(cifs_max_pending, uint, 0444);
95 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
96 "CIFS/SMB1 dialect (N/A for SMB3) "
97 "Default: 32767 Range: 2 to 32767.");
98 #ifdef CONFIG_CIFS_STATS2
99 unsigned int slow_rsp_threshold = 1;
100 module_param(slow_rsp_threshold, uint, 0644);
101 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
102 "before logging that a response is delayed. "
103 "Default: 1 (if set to 0 disables msg).");
104 #endif /* STATS2 */
105
106 module_param(enable_oplocks, bool, 0644);
107 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
108
109 module_param(enable_gcm_256, bool, 0644);
110 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
111
112 module_param(require_gcm_256, bool, 0644);
113 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
114
115 module_param(disable_legacy_dialects, bool, 0644);
116 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
117 "helpful to restrict the ability to "
118 "override the default dialects (SMB2.1, "
119 "SMB3 and SMB3.02) on mount with old "
120 "dialects (CIFS/SMB1 and SMB2) since "
121 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
122 " and less secure. Default: n/N/0");
123
124 extern mempool_t *cifs_sm_req_poolp;
125 extern mempool_t *cifs_req_poolp;
126 extern mempool_t *cifs_mid_poolp;
127
128 struct workqueue_struct *cifsiod_wq;
129 struct workqueue_struct *decrypt_wq;
130 struct workqueue_struct *fileinfo_put_wq;
131 struct workqueue_struct *cifsoplockd_wq;
132 __u32 cifs_lock_secret;
133
134 /*
135 * Bumps refcount for cifs super block.
136 * Note that it should be only called if a referece to VFS super block is
137 * already held, e.g. in open-type syscalls context. Otherwise it can race with
138 * atomic_dec_and_test in deactivate_locked_super.
139 */
140 void
cifs_sb_active(struct super_block * sb)141 cifs_sb_active(struct super_block *sb)
142 {
143 struct cifs_sb_info *server = CIFS_SB(sb);
144
145 if (atomic_inc_return(&server->active) == 1)
146 atomic_inc(&sb->s_active);
147 }
148
149 void
cifs_sb_deactive(struct super_block * sb)150 cifs_sb_deactive(struct super_block *sb)
151 {
152 struct cifs_sb_info *server = CIFS_SB(sb);
153
154 if (atomic_dec_and_test(&server->active))
155 deactivate_super(sb);
156 }
157
158 static int
cifs_read_super(struct super_block * sb)159 cifs_read_super(struct super_block *sb)
160 {
161 struct inode *inode;
162 struct cifs_sb_info *cifs_sb;
163 struct cifs_tcon *tcon;
164 struct timespec64 ts;
165 int rc = 0;
166
167 cifs_sb = CIFS_SB(sb);
168 tcon = cifs_sb_master_tcon(cifs_sb);
169
170 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
171 sb->s_flags |= SB_POSIXACL;
172
173 if (tcon->snapshot_time)
174 sb->s_flags |= SB_RDONLY;
175
176 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
177 sb->s_maxbytes = MAX_LFS_FILESIZE;
178 else
179 sb->s_maxbytes = MAX_NON_LFS;
180
181 /*
182 * Some very old servers like DOS and OS/2 used 2 second granularity
183 * (while all current servers use 100ns granularity - see MS-DTYP)
184 * but 1 second is the maximum allowed granularity for the VFS
185 * so for old servers set time granularity to 1 second while for
186 * everything else (current servers) set it to 100ns.
187 */
188 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
189 ((tcon->ses->capabilities &
190 tcon->ses->server->vals->cap_nt_find) == 0) &&
191 !tcon->unix_ext) {
192 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
193 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
194 sb->s_time_min = ts.tv_sec;
195 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
196 cpu_to_le16(SMB_TIME_MAX), 0);
197 sb->s_time_max = ts.tv_sec;
198 } else {
199 /*
200 * Almost every server, including all SMB2+, uses DCE TIME
201 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
202 */
203 sb->s_time_gran = 100;
204 ts = cifs_NTtimeToUnix(0);
205 sb->s_time_min = ts.tv_sec;
206 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
207 sb->s_time_max = ts.tv_sec;
208 }
209
210 sb->s_magic = CIFS_MAGIC_NUMBER;
211 sb->s_op = &cifs_super_ops;
212 sb->s_xattr = cifs_xattr_handlers;
213 rc = super_setup_bdi(sb);
214 if (rc)
215 goto out_no_root;
216 /* tune readahead according to rsize */
217 sb->s_bdi->ra_pages = cifs_sb->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
248 out_no_root:
249 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
250 return rc;
251 }
252
cifs_kill_sb(struct super_block * sb)253 static void cifs_kill_sb(struct super_block *sb)
254 {
255 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
256 kill_anon_super(sb);
257 cifs_umount(cifs_sb);
258 }
259
260 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)261 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
262 {
263 struct super_block *sb = dentry->d_sb;
264 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
265 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
266 struct TCP_Server_Info *server = tcon->ses->server;
267 unsigned int xid;
268 int rc = 0;
269
270 xid = get_xid();
271
272 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
273 buf->f_namelen =
274 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
275 else
276 buf->f_namelen = PATH_MAX;
277
278 buf->f_fsid.val[0] = tcon->vol_serial_number;
279 /* are using part of create time for more randomness, see man statfs */
280 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
281
282 buf->f_files = 0; /* undefined */
283 buf->f_ffree = 0; /* unlimited */
284
285 if (server->ops->queryfs)
286 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
287
288 free_xid(xid);
289 return rc;
290 }
291
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)292 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
293 {
294 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
295 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
296 struct TCP_Server_Info *server = tcon->ses->server;
297
298 if (server->ops->fallocate)
299 return server->ops->fallocate(file, tcon, mode, off, len);
300
301 return -EOPNOTSUPP;
302 }
303
cifs_permission(struct inode * inode,int mask)304 static int cifs_permission(struct inode *inode, int mask)
305 {
306 struct cifs_sb_info *cifs_sb;
307
308 cifs_sb = CIFS_SB(inode->i_sb);
309
310 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
311 if ((mask & MAY_EXEC) && !execute_ok(inode))
312 return -EACCES;
313 else
314 return 0;
315 } else /* file mode might have been restricted at mount time
316 on the client (above and beyond ACL on servers) for
317 servers which do not support setting and viewing mode bits,
318 so allowing client to check permissions is useful */
319 return generic_permission(inode, mask);
320 }
321
322 static struct kmem_cache *cifs_inode_cachep;
323 static struct kmem_cache *cifs_req_cachep;
324 static struct kmem_cache *cifs_mid_cachep;
325 static struct kmem_cache *cifs_sm_req_cachep;
326 mempool_t *cifs_sm_req_poolp;
327 mempool_t *cifs_req_poolp;
328 mempool_t *cifs_mid_poolp;
329
330 static struct inode *
cifs_alloc_inode(struct super_block * sb)331 cifs_alloc_inode(struct super_block *sb)
332 {
333 struct cifsInodeInfo *cifs_inode;
334 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
335 if (!cifs_inode)
336 return NULL;
337 cifs_inode->cifsAttrs = 0x20; /* default */
338 cifs_inode->time = 0;
339 /*
340 * Until the file is open and we have gotten oplock info back from the
341 * server, can not assume caching of file data or metadata.
342 */
343 cifs_set_oplock_level(cifs_inode, 0);
344 cifs_inode->flags = 0;
345 spin_lock_init(&cifs_inode->writers_lock);
346 cifs_inode->writers = 0;
347 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
348 cifs_inode->server_eof = 0;
349 cifs_inode->uniqueid = 0;
350 cifs_inode->createtime = 0;
351 cifs_inode->epoch = 0;
352 spin_lock_init(&cifs_inode->open_file_lock);
353 generate_random_uuid(cifs_inode->lease_key);
354
355 /*
356 * Can not set i_flags here - they get immediately overwritten to zero
357 * by the VFS.
358 */
359 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
360 INIT_LIST_HEAD(&cifs_inode->openFileList);
361 INIT_LIST_HEAD(&cifs_inode->llist);
362 return &cifs_inode->vfs_inode;
363 }
364
365 static void
cifs_free_inode(struct inode * inode)366 cifs_free_inode(struct inode *inode)
367 {
368 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
369 }
370
371 static void
cifs_evict_inode(struct inode * inode)372 cifs_evict_inode(struct inode *inode)
373 {
374 truncate_inode_pages_final(&inode->i_data);
375 clear_inode(inode);
376 cifs_fscache_release_inode_cookie(inode);
377 }
378
379 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)380 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
381 {
382 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
383 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
384
385 seq_puts(s, ",addr=");
386
387 switch (server->dstaddr.ss_family) {
388 case AF_INET:
389 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
390 break;
391 case AF_INET6:
392 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
393 if (sa6->sin6_scope_id)
394 seq_printf(s, "%%%u", sa6->sin6_scope_id);
395 break;
396 default:
397 seq_puts(s, "(unknown)");
398 }
399 if (server->rdma)
400 seq_puts(s, ",rdma");
401 }
402
403 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)404 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
405 {
406 if (ses->sectype == Unspecified) {
407 if (ses->user_name == NULL)
408 seq_puts(s, ",sec=none");
409 return;
410 }
411
412 seq_puts(s, ",sec=");
413
414 switch (ses->sectype) {
415 case LANMAN:
416 seq_puts(s, "lanman");
417 break;
418 case NTLMv2:
419 seq_puts(s, "ntlmv2");
420 break;
421 case NTLM:
422 seq_puts(s, "ntlm");
423 break;
424 case Kerberos:
425 seq_puts(s, "krb5");
426 break;
427 case RawNTLMSSP:
428 seq_puts(s, "ntlmssp");
429 break;
430 default:
431 /* shouldn't ever happen */
432 seq_puts(s, "unknown");
433 break;
434 }
435
436 if (ses->sign)
437 seq_puts(s, "i");
438
439 if (ses->sectype == Kerberos)
440 seq_printf(s, ",cruid=%u",
441 from_kuid_munged(&init_user_ns, ses->cred_uid));
442 }
443
444 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)445 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
446 {
447 seq_puts(s, ",cache=");
448
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
450 seq_puts(s, "strict");
451 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
452 seq_puts(s, "none");
453 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
454 seq_puts(s, "singleclient"); /* assume only one client access */
455 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
456 seq_puts(s, "ro"); /* read only caching assumed */
457 else
458 seq_puts(s, "loose");
459 }
460
461 static void
cifs_show_nls(struct seq_file * s,struct nls_table * cur)462 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
463 {
464 struct nls_table *def;
465
466 /* Display iocharset= option if it's not default charset */
467 def = load_nls_default();
468 if (def != cur)
469 seq_printf(s, ",iocharset=%s", cur->charset);
470 unload_nls(def);
471 }
472
473 /*
474 * cifs_show_options() is for displaying mount options in /proc/mounts.
475 * Not all settable options are displayed but most of the important
476 * ones are.
477 */
478 static int
cifs_show_options(struct seq_file * s,struct dentry * root)479 cifs_show_options(struct seq_file *s, struct dentry *root)
480 {
481 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
482 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
483 struct sockaddr *srcaddr;
484 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
485
486 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
487 cifs_show_security(s, tcon->ses);
488 cifs_show_cache_flavor(s, cifs_sb);
489
490 if (tcon->no_lease)
491 seq_puts(s, ",nolease");
492 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
493 seq_puts(s, ",multiuser");
494 else if (tcon->ses->user_name)
495 seq_show_option(s, "username", tcon->ses->user_name);
496
497 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
498 seq_show_option(s, "domain", tcon->ses->domainName);
499
500 if (srcaddr->sa_family != AF_UNSPEC) {
501 struct sockaddr_in *saddr4;
502 struct sockaddr_in6 *saddr6;
503 saddr4 = (struct sockaddr_in *)srcaddr;
504 saddr6 = (struct sockaddr_in6 *)srcaddr;
505 if (srcaddr->sa_family == AF_INET6)
506 seq_printf(s, ",srcaddr=%pI6c",
507 &saddr6->sin6_addr);
508 else if (srcaddr->sa_family == AF_INET)
509 seq_printf(s, ",srcaddr=%pI4",
510 &saddr4->sin_addr.s_addr);
511 else
512 seq_printf(s, ",srcaddr=BAD-AF:%i",
513 (int)(srcaddr->sa_family));
514 }
515
516 seq_printf(s, ",uid=%u",
517 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
518 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
519 seq_puts(s, ",forceuid");
520 else
521 seq_puts(s, ",noforceuid");
522
523 seq_printf(s, ",gid=%u",
524 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
525 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
526 seq_puts(s, ",forcegid");
527 else
528 seq_puts(s, ",noforcegid");
529
530 cifs_show_address(s, tcon->ses->server);
531
532 if (!tcon->unix_ext)
533 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
534 cifs_sb->mnt_file_mode,
535 cifs_sb->mnt_dir_mode);
536
537 cifs_show_nls(s, cifs_sb->local_nls);
538
539 if (tcon->seal)
540 seq_puts(s, ",seal");
541 else if (tcon->ses->server->ignore_signature)
542 seq_puts(s, ",signloosely");
543 if (tcon->nocase)
544 seq_puts(s, ",nocase");
545 if (tcon->nodelete)
546 seq_puts(s, ",nodelete");
547 if (tcon->local_lease)
548 seq_puts(s, ",locallease");
549 if (tcon->retry)
550 seq_puts(s, ",hard");
551 else
552 seq_puts(s, ",soft");
553 if (tcon->use_persistent)
554 seq_puts(s, ",persistenthandles");
555 else if (tcon->use_resilient)
556 seq_puts(s, ",resilienthandles");
557 if (tcon->posix_extensions)
558 seq_puts(s, ",posix");
559 else if (tcon->unix_ext)
560 seq_puts(s, ",unix");
561 else
562 seq_puts(s, ",nounix");
563 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
564 seq_puts(s, ",nodfs");
565 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
566 seq_puts(s, ",posixpaths");
567 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
568 seq_puts(s, ",setuids");
569 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
570 seq_puts(s, ",idsfromsid");
571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
572 seq_puts(s, ",serverino");
573 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
574 seq_puts(s, ",rwpidforward");
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
576 seq_puts(s, ",forcemand");
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
578 seq_puts(s, ",nouser_xattr");
579 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
580 seq_puts(s, ",mapchars");
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
582 seq_puts(s, ",mapposix");
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
584 seq_puts(s, ",sfu");
585 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
586 seq_puts(s, ",nobrl");
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
588 seq_puts(s, ",nohandlecache");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
590 seq_puts(s, ",modefromsid");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
592 seq_puts(s, ",cifsacl");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
594 seq_puts(s, ",dynperm");
595 if (root->d_sb->s_flags & SB_POSIXACL)
596 seq_puts(s, ",acl");
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
598 seq_puts(s, ",mfsymlinks");
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
600 seq_puts(s, ",fsc");
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
602 seq_puts(s, ",nostrictsync");
603 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
604 seq_puts(s, ",noperm");
605 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
606 seq_printf(s, ",backupuid=%u",
607 from_kuid_munged(&init_user_ns,
608 cifs_sb->mnt_backupuid));
609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
610 seq_printf(s, ",backupgid=%u",
611 from_kgid_munged(&init_user_ns,
612 cifs_sb->mnt_backupgid));
613
614 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
615 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
616 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
617 if (tcon->ses->server->min_offload)
618 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
619 seq_printf(s, ",echo_interval=%lu",
620 tcon->ses->server->echo_interval / HZ);
621
622 /* Only display max_credits if it was overridden on mount */
623 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
624 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
625
626 if (tcon->snapshot_time)
627 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
628 if (tcon->handle_timeout)
629 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
630 /* convert actimeo and display it in seconds */
631 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
632
633 if (tcon->ses->chan_max > 1)
634 seq_printf(s, ",multichannel,max_channels=%zu",
635 tcon->ses->chan_max);
636
637 return 0;
638 }
639
cifs_umount_begin(struct super_block * sb)640 static void cifs_umount_begin(struct super_block *sb)
641 {
642 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
643 struct cifs_tcon *tcon;
644
645 if (cifs_sb == NULL)
646 return;
647
648 tcon = cifs_sb_master_tcon(cifs_sb);
649
650 spin_lock(&cifs_tcp_ses_lock);
651 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
652 /* we have other mounts to same share or we have
653 already tried to force umount this and woken up
654 all waiting network requests, nothing to do */
655 spin_unlock(&cifs_tcp_ses_lock);
656 return;
657 } else if (tcon->tc_count == 1)
658 tcon->tidStatus = CifsExiting;
659 spin_unlock(&cifs_tcp_ses_lock);
660
661 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
662 /* cancel_notify_requests(tcon); */
663 if (tcon->ses && tcon->ses->server) {
664 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
665 wake_up_all(&tcon->ses->server->request_q);
666 wake_up_all(&tcon->ses->server->response_q);
667 msleep(1); /* yield */
668 /* we have to kick the requests once more */
669 wake_up_all(&tcon->ses->server->response_q);
670 msleep(1);
671 }
672
673 return;
674 }
675
676 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)677 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
678 {
679 /* BB FIXME */
680 return 0;
681 }
682 #endif
683
cifs_remount(struct super_block * sb,int * flags,char * data)684 static int cifs_remount(struct super_block *sb, int *flags, char *data)
685 {
686 sync_filesystem(sb);
687 *flags |= SB_NODIRATIME;
688 return 0;
689 }
690
cifs_drop_inode(struct inode * inode)691 static int cifs_drop_inode(struct inode *inode)
692 {
693 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
694
695 /* no serverino => unconditional eviction */
696 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
697 generic_drop_inode(inode);
698 }
699
700 static const struct super_operations cifs_super_ops = {
701 .statfs = cifs_statfs,
702 .alloc_inode = cifs_alloc_inode,
703 .free_inode = cifs_free_inode,
704 .drop_inode = cifs_drop_inode,
705 .evict_inode = cifs_evict_inode,
706 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
707 function unless later we add lazy close of inodes or unless the
708 kernel forgets to call us with the same number of releases (closes)
709 as opens */
710 .show_options = cifs_show_options,
711 .umount_begin = cifs_umount_begin,
712 .remount_fs = cifs_remount,
713 #ifdef CONFIG_CIFS_STATS2
714 .show_stats = cifs_show_stats,
715 #endif
716 };
717
718 /*
719 * Get root dentry from superblock according to prefix path mount option.
720 * Return dentry with refcount + 1 on success and NULL otherwise.
721 */
722 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)723 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
724 {
725 struct dentry *dentry;
726 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
727 char *full_path = NULL;
728 char *s, *p;
729 char sep;
730
731 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
732 return dget(sb->s_root);
733
734 full_path = cifs_build_path_to_root(vol, cifs_sb,
735 cifs_sb_master_tcon(cifs_sb), 0);
736 if (full_path == NULL)
737 return ERR_PTR(-ENOMEM);
738
739 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
740
741 sep = CIFS_DIR_SEP(cifs_sb);
742 dentry = dget(sb->s_root);
743 p = s = full_path;
744
745 do {
746 struct inode *dir = d_inode(dentry);
747 struct dentry *child;
748
749 if (!S_ISDIR(dir->i_mode)) {
750 dput(dentry);
751 dentry = ERR_PTR(-ENOTDIR);
752 break;
753 }
754
755 /* skip separators */
756 while (*s == sep)
757 s++;
758 if (!*s)
759 break;
760 p = s++;
761 /* next separator */
762 while (*s && *s != sep)
763 s++;
764
765 child = lookup_positive_unlocked(p, dentry, s - p);
766 dput(dentry);
767 dentry = child;
768 } while (!IS_ERR(dentry));
769 kfree(full_path);
770 return dentry;
771 }
772
cifs_set_super(struct super_block * sb,void * data)773 static int cifs_set_super(struct super_block *sb, void *data)
774 {
775 struct cifs_mnt_data *mnt_data = data;
776 sb->s_fs_info = mnt_data->cifs_sb;
777 return set_anon_super(sb, NULL);
778 }
779
780 static struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,bool is_smb3)781 cifs_smb3_do_mount(struct file_system_type *fs_type,
782 int flags, const char *dev_name, void *data, bool is_smb3)
783 {
784 int rc;
785 struct super_block *sb;
786 struct cifs_sb_info *cifs_sb;
787 struct smb_vol *volume_info;
788 struct cifs_mnt_data mnt_data;
789 struct dentry *root;
790
791 /*
792 * Prints in Kernel / CIFS log the attempted mount operation
793 * If CIFS_DEBUG && cifs_FYI
794 */
795 if (cifsFYI)
796 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
797 else
798 cifs_info("Attempting to mount %s\n", dev_name);
799
800 volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
801 if (IS_ERR(volume_info))
802 return ERR_CAST(volume_info);
803
804 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
805 if (cifs_sb == NULL) {
806 root = ERR_PTR(-ENOMEM);
807 goto out_nls;
808 }
809
810 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
811 if (cifs_sb->mountdata == NULL) {
812 root = ERR_PTR(-ENOMEM);
813 goto out_free;
814 }
815
816 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
817 if (rc) {
818 root = ERR_PTR(rc);
819 goto out_free;
820 }
821
822 rc = cifs_mount(cifs_sb, volume_info);
823 if (rc) {
824 if (!(flags & SB_SILENT))
825 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
826 rc);
827 root = ERR_PTR(rc);
828 goto out_free;
829 }
830
831 mnt_data.vol = volume_info;
832 mnt_data.cifs_sb = cifs_sb;
833 mnt_data.flags = flags;
834
835 /* BB should we make this contingent on mount parm? */
836 flags |= SB_NODIRATIME | SB_NOATIME;
837
838 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
839 if (IS_ERR(sb)) {
840 root = ERR_CAST(sb);
841 cifs_umount(cifs_sb);
842 goto out;
843 }
844
845 if (sb->s_root) {
846 cifs_dbg(FYI, "Use existing superblock\n");
847 cifs_umount(cifs_sb);
848 } else {
849 rc = cifs_read_super(sb);
850 if (rc) {
851 root = ERR_PTR(rc);
852 goto out_super;
853 }
854
855 sb->s_flags |= SB_ACTIVE;
856 }
857
858 root = cifs_get_root(volume_info, sb);
859 if (IS_ERR(root))
860 goto out_super;
861
862 cifs_dbg(FYI, "dentry root is: %p\n", root);
863 goto out;
864
865 out_super:
866 deactivate_locked_super(sb);
867 out:
868 cifs_cleanup_volume_info(volume_info);
869 return root;
870
871 out_free:
872 kfree(cifs_sb->prepath);
873 kfree(cifs_sb->mountdata);
874 kfree(cifs_sb);
875 out_nls:
876 unload_nls(volume_info->local_nls);
877 goto out;
878 }
879
880 static struct dentry *
smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)881 smb3_do_mount(struct file_system_type *fs_type,
882 int flags, const char *dev_name, void *data)
883 {
884 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, true);
885 }
886
887 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)888 cifs_do_mount(struct file_system_type *fs_type,
889 int flags, const char *dev_name, void *data)
890 {
891 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, false);
892 }
893
894 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)895 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
896 {
897 ssize_t rc;
898 struct inode *inode = file_inode(iocb->ki_filp);
899
900 if (iocb->ki_filp->f_flags & O_DIRECT)
901 return cifs_user_readv(iocb, iter);
902
903 rc = cifs_revalidate_mapping(inode);
904 if (rc)
905 return rc;
906
907 return generic_file_read_iter(iocb, iter);
908 }
909
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)910 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
911 {
912 struct inode *inode = file_inode(iocb->ki_filp);
913 struct cifsInodeInfo *cinode = CIFS_I(inode);
914 ssize_t written;
915 int rc;
916
917 if (iocb->ki_filp->f_flags & O_DIRECT) {
918 written = cifs_user_writev(iocb, from);
919 if (written > 0 && CIFS_CACHE_READ(cinode)) {
920 cifs_zap_mapping(inode);
921 cifs_dbg(FYI,
922 "Set no oplock for inode=%p after a write operation\n",
923 inode);
924 cinode->oplock = 0;
925 }
926 return written;
927 }
928
929 written = cifs_get_writer(cinode);
930 if (written)
931 return written;
932
933 written = generic_file_write_iter(iocb, from);
934
935 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
936 goto out;
937
938 rc = filemap_fdatawrite(inode->i_mapping);
939 if (rc)
940 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
941 rc, inode);
942
943 out:
944 cifs_put_writer(cinode);
945 return written;
946 }
947
cifs_llseek(struct file * file,loff_t offset,int whence)948 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
949 {
950 struct cifsFileInfo *cfile = file->private_data;
951 struct cifs_tcon *tcon;
952
953 /*
954 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
955 * the cached file length
956 */
957 if (whence != SEEK_SET && whence != SEEK_CUR) {
958 int rc;
959 struct inode *inode = file_inode(file);
960
961 /*
962 * We need to be sure that all dirty pages are written and the
963 * server has the newest file length.
964 */
965 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
966 inode->i_mapping->nrpages != 0) {
967 rc = filemap_fdatawait(inode->i_mapping);
968 if (rc) {
969 mapping_set_error(inode->i_mapping, rc);
970 return rc;
971 }
972 }
973 /*
974 * Some applications poll for the file length in this strange
975 * way so we must seek to end on non-oplocked files by
976 * setting the revalidate time to zero.
977 */
978 CIFS_I(inode)->time = 0;
979
980 rc = cifs_revalidate_file_attr(file);
981 if (rc < 0)
982 return (loff_t)rc;
983 }
984 if (cfile && cfile->tlink) {
985 tcon = tlink_tcon(cfile->tlink);
986 if (tcon->ses->server->ops->llseek)
987 return tcon->ses->server->ops->llseek(file, tcon,
988 offset, whence);
989 }
990 return generic_file_llseek(file, offset, whence);
991 }
992
993 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)994 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
995 {
996 /*
997 * Note that this is called by vfs setlease with i_lock held to
998 * protect *lease from going away.
999 */
1000 struct inode *inode = file_inode(file);
1001 struct cifsFileInfo *cfile = file->private_data;
1002
1003 if (!(S_ISREG(inode->i_mode)))
1004 return -EINVAL;
1005
1006 /* Check if file is oplocked if this is request for new lease */
1007 if (arg == F_UNLCK ||
1008 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1009 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1010 return generic_setlease(file, arg, lease, priv);
1011 else if (tlink_tcon(cfile->tlink)->local_lease &&
1012 !CIFS_CACHE_READ(CIFS_I(inode)))
1013 /*
1014 * If the server claims to support oplock on this file, then we
1015 * still need to check oplock even if the local_lease mount
1016 * option is set, but there are servers which do not support
1017 * oplock for which this mount option may be useful if the user
1018 * knows that the file won't be changed on the server by anyone
1019 * else.
1020 */
1021 return generic_setlease(file, arg, lease, priv);
1022 else
1023 return -EAGAIN;
1024 }
1025
1026 struct file_system_type cifs_fs_type = {
1027 .owner = THIS_MODULE,
1028 .name = "cifs",
1029 .mount = cifs_do_mount,
1030 .kill_sb = cifs_kill_sb,
1031 .fs_flags = FS_RENAME_DOES_D_MOVE,
1032 };
1033 MODULE_ALIAS_FS("cifs");
1034
1035 static struct file_system_type smb3_fs_type = {
1036 .owner = THIS_MODULE,
1037 .name = "smb3",
1038 .mount = smb3_do_mount,
1039 .kill_sb = cifs_kill_sb,
1040 .fs_flags = FS_RENAME_DOES_D_MOVE,
1041 };
1042 MODULE_ALIAS_FS("smb3");
1043 MODULE_ALIAS("smb3");
1044
1045 const struct inode_operations cifs_dir_inode_ops = {
1046 .create = cifs_create,
1047 .atomic_open = cifs_atomic_open,
1048 .lookup = cifs_lookup,
1049 .getattr = cifs_getattr,
1050 .unlink = cifs_unlink,
1051 .link = cifs_hardlink,
1052 .mkdir = cifs_mkdir,
1053 .rmdir = cifs_rmdir,
1054 .rename = cifs_rename2,
1055 .permission = cifs_permission,
1056 .setattr = cifs_setattr,
1057 .symlink = cifs_symlink,
1058 .mknod = cifs_mknod,
1059 .listxattr = cifs_listxattr,
1060 };
1061
1062 const struct inode_operations cifs_file_inode_ops = {
1063 .setattr = cifs_setattr,
1064 .getattr = cifs_getattr,
1065 .permission = cifs_permission,
1066 .listxattr = cifs_listxattr,
1067 .fiemap = cifs_fiemap,
1068 };
1069
1070 const struct inode_operations cifs_symlink_inode_ops = {
1071 .get_link = cifs_get_link,
1072 .permission = cifs_permission,
1073 .listxattr = cifs_listxattr,
1074 };
1075
cifs_remap_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,loff_t len,unsigned int remap_flags)1076 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1077 struct file *dst_file, loff_t destoff, loff_t len,
1078 unsigned int remap_flags)
1079 {
1080 struct inode *src_inode = file_inode(src_file);
1081 struct inode *target_inode = file_inode(dst_file);
1082 struct cifsFileInfo *smb_file_src = src_file->private_data;
1083 struct cifsFileInfo *smb_file_target;
1084 struct cifs_tcon *target_tcon;
1085 unsigned int xid;
1086 int rc;
1087
1088 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1089 return -EINVAL;
1090
1091 cifs_dbg(FYI, "clone range\n");
1092
1093 xid = get_xid();
1094
1095 if (!src_file->private_data || !dst_file->private_data) {
1096 rc = -EBADF;
1097 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1098 goto out;
1099 }
1100
1101 smb_file_target = dst_file->private_data;
1102 target_tcon = tlink_tcon(smb_file_target->tlink);
1103
1104 /*
1105 * Note: cifs case is easier than btrfs since server responsible for
1106 * checks for proper open modes and file type and if it wants
1107 * server could even support copy of range where source = target
1108 */
1109 lock_two_nondirectories(target_inode, src_inode);
1110
1111 if (len == 0)
1112 len = src_inode->i_size - off;
1113
1114 cifs_dbg(FYI, "about to flush pages\n");
1115 /* should we flush first and last page first */
1116 truncate_inode_pages_range(&target_inode->i_data, destoff,
1117 PAGE_ALIGN(destoff + len)-1);
1118
1119 if (target_tcon->ses->server->ops->duplicate_extents)
1120 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1121 smb_file_src, smb_file_target, off, len, destoff);
1122 else
1123 rc = -EOPNOTSUPP;
1124
1125 /* force revalidate of size and timestamps of target file now
1126 that target is updated on the server */
1127 CIFS_I(target_inode)->time = 0;
1128 /* although unlocking in the reverse order from locking is not
1129 strictly necessary here it is a little cleaner to be consistent */
1130 unlock_two_nondirectories(src_inode, target_inode);
1131 out:
1132 free_xid(xid);
1133 return rc < 0 ? rc : len;
1134 }
1135
cifs_file_copychunk_range(unsigned int xid,struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1136 ssize_t cifs_file_copychunk_range(unsigned int xid,
1137 struct file *src_file, loff_t off,
1138 struct file *dst_file, loff_t destoff,
1139 size_t len, unsigned int flags)
1140 {
1141 struct inode *src_inode = file_inode(src_file);
1142 struct inode *target_inode = file_inode(dst_file);
1143 struct cifsFileInfo *smb_file_src;
1144 struct cifsFileInfo *smb_file_target;
1145 struct cifs_tcon *src_tcon;
1146 struct cifs_tcon *target_tcon;
1147 ssize_t rc;
1148
1149 cifs_dbg(FYI, "copychunk range\n");
1150
1151 if (!src_file->private_data || !dst_file->private_data) {
1152 rc = -EBADF;
1153 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1154 goto out;
1155 }
1156
1157 rc = -EXDEV;
1158 smb_file_target = dst_file->private_data;
1159 smb_file_src = src_file->private_data;
1160 src_tcon = tlink_tcon(smb_file_src->tlink);
1161 target_tcon = tlink_tcon(smb_file_target->tlink);
1162
1163 if (src_tcon->ses != target_tcon->ses) {
1164 cifs_dbg(VFS, "source and target of copy not on same server\n");
1165 goto out;
1166 }
1167
1168 rc = -EOPNOTSUPP;
1169 if (!target_tcon->ses->server->ops->copychunk_range)
1170 goto out;
1171
1172 /*
1173 * Note: cifs case is easier than btrfs since server responsible for
1174 * checks for proper open modes and file type and if it wants
1175 * server could even support copy of range where source = target
1176 */
1177 lock_two_nondirectories(target_inode, src_inode);
1178
1179 cifs_dbg(FYI, "about to flush pages\n");
1180 /* should we flush first and last page first */
1181 truncate_inode_pages(&target_inode->i_data, 0);
1182
1183 rc = file_modified(dst_file);
1184 if (!rc)
1185 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1186 smb_file_src, smb_file_target, off, len, destoff);
1187
1188 file_accessed(src_file);
1189
1190 /* force revalidate of size and timestamps of target file now
1191 * that target is updated on the server
1192 */
1193 CIFS_I(target_inode)->time = 0;
1194 /* although unlocking in the reverse order from locking is not
1195 * strictly necessary here it is a little cleaner to be consistent
1196 */
1197 unlock_two_nondirectories(src_inode, target_inode);
1198
1199 out:
1200 return rc;
1201 }
1202
1203 /*
1204 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1205 * is a dummy operation.
1206 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1207 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1208 {
1209 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1210 file, datasync);
1211
1212 return 0;
1213 }
1214
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1215 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1216 struct file *dst_file, loff_t destoff,
1217 size_t len, unsigned int flags)
1218 {
1219 unsigned int xid = get_xid();
1220 ssize_t rc;
1221 struct cifsFileInfo *cfile = dst_file->private_data;
1222
1223 if (cfile->swapfile)
1224 return -EOPNOTSUPP;
1225
1226 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1227 len, flags);
1228 free_xid(xid);
1229
1230 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1231 rc = generic_copy_file_range(src_file, off, dst_file,
1232 destoff, len, flags);
1233 return rc;
1234 }
1235
1236 const struct file_operations cifs_file_ops = {
1237 .read_iter = cifs_loose_read_iter,
1238 .write_iter = cifs_file_write_iter,
1239 .open = cifs_open,
1240 .release = cifs_close,
1241 .lock = cifs_lock,
1242 .flock = cifs_flock,
1243 .fsync = cifs_fsync,
1244 .flush = cifs_flush,
1245 .mmap = cifs_file_mmap,
1246 .splice_read = generic_file_splice_read,
1247 .splice_write = iter_file_splice_write,
1248 .llseek = cifs_llseek,
1249 .unlocked_ioctl = cifs_ioctl,
1250 .copy_file_range = cifs_copy_file_range,
1251 .remap_file_range = cifs_remap_file_range,
1252 .setlease = cifs_setlease,
1253 .fallocate = cifs_fallocate,
1254 };
1255
1256 const struct file_operations cifs_file_strict_ops = {
1257 .read_iter = cifs_strict_readv,
1258 .write_iter = cifs_strict_writev,
1259 .open = cifs_open,
1260 .release = cifs_close,
1261 .lock = cifs_lock,
1262 .flock = cifs_flock,
1263 .fsync = cifs_strict_fsync,
1264 .flush = cifs_flush,
1265 .mmap = cifs_file_strict_mmap,
1266 .splice_read = generic_file_splice_read,
1267 .splice_write = iter_file_splice_write,
1268 .llseek = cifs_llseek,
1269 .unlocked_ioctl = cifs_ioctl,
1270 .copy_file_range = cifs_copy_file_range,
1271 .remap_file_range = cifs_remap_file_range,
1272 .setlease = cifs_setlease,
1273 .fallocate = cifs_fallocate,
1274 };
1275
1276 const struct file_operations cifs_file_direct_ops = {
1277 .read_iter = cifs_direct_readv,
1278 .write_iter = cifs_direct_writev,
1279 .open = cifs_open,
1280 .release = cifs_close,
1281 .lock = cifs_lock,
1282 .flock = cifs_flock,
1283 .fsync = cifs_fsync,
1284 .flush = cifs_flush,
1285 .mmap = cifs_file_mmap,
1286 .splice_read = generic_file_splice_read,
1287 .splice_write = iter_file_splice_write,
1288 .unlocked_ioctl = cifs_ioctl,
1289 .copy_file_range = cifs_copy_file_range,
1290 .remap_file_range = cifs_remap_file_range,
1291 .llseek = cifs_llseek,
1292 .setlease = cifs_setlease,
1293 .fallocate = cifs_fallocate,
1294 };
1295
1296 const struct file_operations cifs_file_nobrl_ops = {
1297 .read_iter = cifs_loose_read_iter,
1298 .write_iter = cifs_file_write_iter,
1299 .open = cifs_open,
1300 .release = cifs_close,
1301 .fsync = cifs_fsync,
1302 .flush = cifs_flush,
1303 .mmap = cifs_file_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
1314 const struct file_operations cifs_file_strict_nobrl_ops = {
1315 .read_iter = cifs_strict_readv,
1316 .write_iter = cifs_strict_writev,
1317 .open = cifs_open,
1318 .release = cifs_close,
1319 .fsync = cifs_strict_fsync,
1320 .flush = cifs_flush,
1321 .mmap = cifs_file_strict_mmap,
1322 .splice_read = generic_file_splice_read,
1323 .splice_write = iter_file_splice_write,
1324 .llseek = cifs_llseek,
1325 .unlocked_ioctl = cifs_ioctl,
1326 .copy_file_range = cifs_copy_file_range,
1327 .remap_file_range = cifs_remap_file_range,
1328 .setlease = cifs_setlease,
1329 .fallocate = cifs_fallocate,
1330 };
1331
1332 const struct file_operations cifs_file_direct_nobrl_ops = {
1333 .read_iter = cifs_direct_readv,
1334 .write_iter = cifs_direct_writev,
1335 .open = cifs_open,
1336 .release = cifs_close,
1337 .fsync = cifs_fsync,
1338 .flush = cifs_flush,
1339 .mmap = cifs_file_mmap,
1340 .splice_read = generic_file_splice_read,
1341 .splice_write = iter_file_splice_write,
1342 .unlocked_ioctl = cifs_ioctl,
1343 .copy_file_range = cifs_copy_file_range,
1344 .remap_file_range = cifs_remap_file_range,
1345 .llseek = cifs_llseek,
1346 .setlease = cifs_setlease,
1347 .fallocate = cifs_fallocate,
1348 };
1349
1350 const struct file_operations cifs_dir_ops = {
1351 .iterate_shared = cifs_readdir,
1352 .release = cifs_closedir,
1353 .read = generic_read_dir,
1354 .unlocked_ioctl = cifs_ioctl,
1355 .copy_file_range = cifs_copy_file_range,
1356 .remap_file_range = cifs_remap_file_range,
1357 .llseek = generic_file_llseek,
1358 .fsync = cifs_dir_fsync,
1359 };
1360
1361 static void
cifs_init_once(void * inode)1362 cifs_init_once(void *inode)
1363 {
1364 struct cifsInodeInfo *cifsi = inode;
1365
1366 inode_init_once(&cifsi->vfs_inode);
1367 init_rwsem(&cifsi->lock_sem);
1368 }
1369
1370 static int __init
cifs_init_inodecache(void)1371 cifs_init_inodecache(void)
1372 {
1373 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1374 sizeof(struct cifsInodeInfo),
1375 0, (SLAB_RECLAIM_ACCOUNT|
1376 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1377 cifs_init_once);
1378 if (cifs_inode_cachep == NULL)
1379 return -ENOMEM;
1380
1381 return 0;
1382 }
1383
1384 static void
cifs_destroy_inodecache(void)1385 cifs_destroy_inodecache(void)
1386 {
1387 /*
1388 * Make sure all delayed rcu free inodes are flushed before we
1389 * destroy cache.
1390 */
1391 rcu_barrier();
1392 kmem_cache_destroy(cifs_inode_cachep);
1393 }
1394
1395 static int
cifs_init_request_bufs(void)1396 cifs_init_request_bufs(void)
1397 {
1398 /*
1399 * SMB2 maximum header size is bigger than CIFS one - no problems to
1400 * allocate some more bytes for CIFS.
1401 */
1402 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1403
1404 if (CIFSMaxBufSize < 8192) {
1405 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1406 Unicode path name has to fit in any SMB/CIFS path based frames */
1407 CIFSMaxBufSize = 8192;
1408 } else if (CIFSMaxBufSize > 1024*127) {
1409 CIFSMaxBufSize = 1024 * 127;
1410 } else {
1411 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1412 }
1413 /*
1414 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1415 CIFSMaxBufSize, CIFSMaxBufSize);
1416 */
1417 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1418 CIFSMaxBufSize + max_hdr_size, 0,
1419 SLAB_HWCACHE_ALIGN, 0,
1420 CIFSMaxBufSize + max_hdr_size,
1421 NULL);
1422 if (cifs_req_cachep == NULL)
1423 return -ENOMEM;
1424
1425 if (cifs_min_rcv < 1)
1426 cifs_min_rcv = 1;
1427 else if (cifs_min_rcv > 64) {
1428 cifs_min_rcv = 64;
1429 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1430 }
1431
1432 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1433 cifs_req_cachep);
1434
1435 if (cifs_req_poolp == NULL) {
1436 kmem_cache_destroy(cifs_req_cachep);
1437 return -ENOMEM;
1438 }
1439 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1440 almost all handle based requests (but not write response, nor is it
1441 sufficient for path based requests). A smaller size would have
1442 been more efficient (compacting multiple slab items on one 4k page)
1443 for the case in which debug was on, but this larger size allows
1444 more SMBs to use small buffer alloc and is still much more
1445 efficient to alloc 1 per page off the slab compared to 17K (5page)
1446 alloc of large cifs buffers even when page debugging is on */
1447 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1448 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1449 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1450 if (cifs_sm_req_cachep == NULL) {
1451 mempool_destroy(cifs_req_poolp);
1452 kmem_cache_destroy(cifs_req_cachep);
1453 return -ENOMEM;
1454 }
1455
1456 if (cifs_min_small < 2)
1457 cifs_min_small = 2;
1458 else if (cifs_min_small > 256) {
1459 cifs_min_small = 256;
1460 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1461 }
1462
1463 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1464 cifs_sm_req_cachep);
1465
1466 if (cifs_sm_req_poolp == NULL) {
1467 mempool_destroy(cifs_req_poolp);
1468 kmem_cache_destroy(cifs_req_cachep);
1469 kmem_cache_destroy(cifs_sm_req_cachep);
1470 return -ENOMEM;
1471 }
1472
1473 return 0;
1474 }
1475
1476 static void
cifs_destroy_request_bufs(void)1477 cifs_destroy_request_bufs(void)
1478 {
1479 mempool_destroy(cifs_req_poolp);
1480 kmem_cache_destroy(cifs_req_cachep);
1481 mempool_destroy(cifs_sm_req_poolp);
1482 kmem_cache_destroy(cifs_sm_req_cachep);
1483 }
1484
1485 static int
cifs_init_mids(void)1486 cifs_init_mids(void)
1487 {
1488 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1489 sizeof(struct mid_q_entry), 0,
1490 SLAB_HWCACHE_ALIGN, NULL);
1491 if (cifs_mid_cachep == NULL)
1492 return -ENOMEM;
1493
1494 /* 3 is a reasonable minimum number of simultaneous operations */
1495 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1496 if (cifs_mid_poolp == NULL) {
1497 kmem_cache_destroy(cifs_mid_cachep);
1498 return -ENOMEM;
1499 }
1500
1501 return 0;
1502 }
1503
1504 static void
cifs_destroy_mids(void)1505 cifs_destroy_mids(void)
1506 {
1507 mempool_destroy(cifs_mid_poolp);
1508 kmem_cache_destroy(cifs_mid_cachep);
1509 }
1510
1511 static int __init
init_cifs(void)1512 init_cifs(void)
1513 {
1514 int rc = 0;
1515 cifs_proc_init();
1516 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1517 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1518 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1519 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1520 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1521 /*
1522 * Initialize Global counters
1523 */
1524 atomic_set(&sesInfoAllocCount, 0);
1525 atomic_set(&tconInfoAllocCount, 0);
1526 atomic_set(&tcpSesAllocCount, 0);
1527 atomic_set(&tcpSesReconnectCount, 0);
1528 atomic_set(&tconInfoReconnectCount, 0);
1529
1530 atomic_set(&bufAllocCount, 0);
1531 atomic_set(&smBufAllocCount, 0);
1532 #ifdef CONFIG_CIFS_STATS2
1533 atomic_set(&totBufAllocCount, 0);
1534 atomic_set(&totSmBufAllocCount, 0);
1535 if (slow_rsp_threshold < 1)
1536 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1537 else if (slow_rsp_threshold > 32767)
1538 cifs_dbg(VFS,
1539 "slow response threshold set higher than recommended (0 to 32767)\n");
1540 #endif /* CONFIG_CIFS_STATS2 */
1541
1542 atomic_set(&midCount, 0);
1543 GlobalCurrentXid = 0;
1544 GlobalTotalActiveXid = 0;
1545 GlobalMaxActiveXid = 0;
1546 spin_lock_init(&cifs_tcp_ses_lock);
1547 spin_lock_init(&GlobalMid_Lock);
1548
1549 cifs_lock_secret = get_random_u32();
1550
1551 if (cifs_max_pending < 2) {
1552 cifs_max_pending = 2;
1553 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1554 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1555 cifs_max_pending = CIFS_MAX_REQ;
1556 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1557 CIFS_MAX_REQ);
1558 }
1559
1560 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1561 if (!cifsiod_wq) {
1562 rc = -ENOMEM;
1563 goto out_clean_proc;
1564 }
1565
1566 /*
1567 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1568 * so that we don't launch too many worker threads but
1569 * Documentation/core-api/workqueue.rst recommends setting it to 0
1570 */
1571
1572 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1573 decrypt_wq = alloc_workqueue("smb3decryptd",
1574 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1575 if (!decrypt_wq) {
1576 rc = -ENOMEM;
1577 goto out_destroy_cifsiod_wq;
1578 }
1579
1580 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1581 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1582 if (!fileinfo_put_wq) {
1583 rc = -ENOMEM;
1584 goto out_destroy_decrypt_wq;
1585 }
1586
1587 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1588 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1589 if (!cifsoplockd_wq) {
1590 rc = -ENOMEM;
1591 goto out_destroy_fileinfo_put_wq;
1592 }
1593
1594 rc = cifs_fscache_register();
1595 if (rc)
1596 goto out_destroy_cifsoplockd_wq;
1597
1598 rc = cifs_init_inodecache();
1599 if (rc)
1600 goto out_unreg_fscache;
1601
1602 rc = cifs_init_mids();
1603 if (rc)
1604 goto out_destroy_inodecache;
1605
1606 rc = cifs_init_request_bufs();
1607 if (rc)
1608 goto out_destroy_mids;
1609
1610 #ifdef CONFIG_CIFS_DFS_UPCALL
1611 rc = dfs_cache_init();
1612 if (rc)
1613 goto out_destroy_request_bufs;
1614 #endif /* CONFIG_CIFS_DFS_UPCALL */
1615 #ifdef CONFIG_CIFS_UPCALL
1616 rc = init_cifs_spnego();
1617 if (rc)
1618 goto out_destroy_dfs_cache;
1619 #endif /* CONFIG_CIFS_UPCALL */
1620
1621 rc = init_cifs_idmap();
1622 if (rc)
1623 goto out_register_key_type;
1624
1625 rc = register_filesystem(&cifs_fs_type);
1626 if (rc)
1627 goto out_init_cifs_idmap;
1628
1629 rc = register_filesystem(&smb3_fs_type);
1630 if (rc) {
1631 unregister_filesystem(&cifs_fs_type);
1632 goto out_init_cifs_idmap;
1633 }
1634
1635 return 0;
1636
1637 out_init_cifs_idmap:
1638 exit_cifs_idmap();
1639 out_register_key_type:
1640 #ifdef CONFIG_CIFS_UPCALL
1641 exit_cifs_spnego();
1642 out_destroy_dfs_cache:
1643 #endif
1644 #ifdef CONFIG_CIFS_DFS_UPCALL
1645 dfs_cache_destroy();
1646 out_destroy_request_bufs:
1647 #endif
1648 cifs_destroy_request_bufs();
1649 out_destroy_mids:
1650 cifs_destroy_mids();
1651 out_destroy_inodecache:
1652 cifs_destroy_inodecache();
1653 out_unreg_fscache:
1654 cifs_fscache_unregister();
1655 out_destroy_cifsoplockd_wq:
1656 destroy_workqueue(cifsoplockd_wq);
1657 out_destroy_fileinfo_put_wq:
1658 destroy_workqueue(fileinfo_put_wq);
1659 out_destroy_decrypt_wq:
1660 destroy_workqueue(decrypt_wq);
1661 out_destroy_cifsiod_wq:
1662 destroy_workqueue(cifsiod_wq);
1663 out_clean_proc:
1664 cifs_proc_clean();
1665 return rc;
1666 }
1667
1668 static void __exit
exit_cifs(void)1669 exit_cifs(void)
1670 {
1671 cifs_dbg(NOISY, "exit_smb3\n");
1672 unregister_filesystem(&cifs_fs_type);
1673 unregister_filesystem(&smb3_fs_type);
1674 cifs_dfs_release_automount_timer();
1675 exit_cifs_idmap();
1676 #ifdef CONFIG_CIFS_UPCALL
1677 exit_cifs_spnego();
1678 #endif
1679 #ifdef CONFIG_CIFS_DFS_UPCALL
1680 dfs_cache_destroy();
1681 #endif
1682 cifs_destroy_request_bufs();
1683 cifs_destroy_mids();
1684 cifs_destroy_inodecache();
1685 cifs_fscache_unregister();
1686 destroy_workqueue(cifsoplockd_wq);
1687 destroy_workqueue(decrypt_wq);
1688 destroy_workqueue(fileinfo_put_wq);
1689 destroy_workqueue(cifsiod_wq);
1690 cifs_proc_clean();
1691 }
1692
1693 MODULE_AUTHOR("Steve French");
1694 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1695 MODULE_DESCRIPTION
1696 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1697 "also older servers complying with the SNIA CIFS Specification)");
1698 MODULE_VERSION(CIFS_VERSION);
1699 MODULE_SOFTDEP("ecb");
1700 MODULE_SOFTDEP("hmac");
1701 MODULE_SOFTDEP("md4");
1702 MODULE_SOFTDEP("md5");
1703 MODULE_SOFTDEP("nls");
1704 MODULE_SOFTDEP("aes");
1705 MODULE_SOFTDEP("cmac");
1706 MODULE_SOFTDEP("sha256");
1707 MODULE_SOFTDEP("sha512");
1708 MODULE_SOFTDEP("aead2");
1709 MODULE_SOFTDEP("ccm");
1710 MODULE_SOFTDEP("gcm");
1711 module_init(init_cifs)
1712 module_exit(exit_cifs)
1713