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 unsigned int global_secflags = CIFSSEC_DEF;
75 /* unsigned int ntlmv2_support = 0; */
76 unsigned int sign_CIFS_PDUs = 1;
77 static const struct super_operations cifs_super_ops;
78 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
79 module_param(CIFSMaxBufSize, uint, 0444);
80 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
81 "for CIFS requests. "
82 "Default: 16384 Range: 8192 to 130048");
83 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
84 module_param(cifs_min_rcv, uint, 0444);
85 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
86 "1 to 64");
87 unsigned int cifs_min_small = 30;
88 module_param(cifs_min_small, uint, 0444);
89 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
90 "Range: 2 to 256");
91 unsigned int cifs_max_pending = CIFS_MAX_REQ;
92 module_param(cifs_max_pending, uint, 0444);
93 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
94 "CIFS/SMB1 dialect (N/A for SMB3) "
95 "Default: 32767 Range: 2 to 32767.");
96 #ifdef CONFIG_CIFS_STATS2
97 unsigned int slow_rsp_threshold = 1;
98 module_param(slow_rsp_threshold, uint, 0644);
99 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
100 "before logging that a response is delayed. "
101 "Default: 1 (if set to 0 disables msg).");
102 #endif /* STATS2 */
103
104 module_param(enable_oplocks, bool, 0644);
105 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
106
107 module_param(disable_legacy_dialects, bool, 0644);
108 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
109 "helpful to restrict the ability to "
110 "override the default dialects (SMB2.1, "
111 "SMB3 and SMB3.02) on mount with old "
112 "dialects (CIFS/SMB1 and SMB2) since "
113 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
114 " and less secure. Default: n/N/0");
115
116 extern mempool_t *cifs_sm_req_poolp;
117 extern mempool_t *cifs_req_poolp;
118 extern mempool_t *cifs_mid_poolp;
119
120 struct workqueue_struct *cifsiod_wq;
121 struct workqueue_struct *decrypt_wq;
122 struct workqueue_struct *fileinfo_put_wq;
123 struct workqueue_struct *cifsoplockd_wq;
124 __u32 cifs_lock_secret;
125
126 /*
127 * Bumps refcount for cifs super block.
128 * Note that it should be only called if a referece to VFS super block is
129 * already held, e.g. in open-type syscalls context. Otherwise it can race with
130 * atomic_dec_and_test in deactivate_locked_super.
131 */
132 void
cifs_sb_active(struct super_block * sb)133 cifs_sb_active(struct super_block *sb)
134 {
135 struct cifs_sb_info *server = CIFS_SB(sb);
136
137 if (atomic_inc_return(&server->active) == 1)
138 atomic_inc(&sb->s_active);
139 }
140
141 void
cifs_sb_deactive(struct super_block * sb)142 cifs_sb_deactive(struct super_block *sb)
143 {
144 struct cifs_sb_info *server = CIFS_SB(sb);
145
146 if (atomic_dec_and_test(&server->active))
147 deactivate_super(sb);
148 }
149
150 static int
cifs_read_super(struct super_block * sb)151 cifs_read_super(struct super_block *sb)
152 {
153 struct inode *inode;
154 struct cifs_sb_info *cifs_sb;
155 struct cifs_tcon *tcon;
156 struct timespec64 ts;
157 int rc = 0;
158
159 cifs_sb = CIFS_SB(sb);
160 tcon = cifs_sb_master_tcon(cifs_sb);
161
162 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
163 sb->s_flags |= SB_POSIXACL;
164
165 if (tcon->snapshot_time)
166 sb->s_flags |= SB_RDONLY;
167
168 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
169 sb->s_maxbytes = MAX_LFS_FILESIZE;
170 else
171 sb->s_maxbytes = MAX_NON_LFS;
172
173 /*
174 * Some very old servers like DOS and OS/2 used 2 second granularity
175 * (while all current servers use 100ns granularity - see MS-DTYP)
176 * but 1 second is the maximum allowed granularity for the VFS
177 * so for old servers set time granularity to 1 second while for
178 * everything else (current servers) set it to 100ns.
179 */
180 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
181 ((tcon->ses->capabilities &
182 tcon->ses->server->vals->cap_nt_find) == 0) &&
183 !tcon->unix_ext) {
184 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
185 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
186 sb->s_time_min = ts.tv_sec;
187 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
188 cpu_to_le16(SMB_TIME_MAX), 0);
189 sb->s_time_max = ts.tv_sec;
190 } else {
191 /*
192 * Almost every server, including all SMB2+, uses DCE TIME
193 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
194 */
195 sb->s_time_gran = 100;
196 ts = cifs_NTtimeToUnix(0);
197 sb->s_time_min = ts.tv_sec;
198 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
199 sb->s_time_max = ts.tv_sec;
200 }
201
202 sb->s_magic = CIFS_MAGIC_NUMBER;
203 sb->s_op = &cifs_super_ops;
204 sb->s_xattr = cifs_xattr_handlers;
205 rc = super_setup_bdi(sb);
206 if (rc)
207 goto out_no_root;
208 /* tune readahead according to rsize */
209 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
210
211 sb->s_blocksize = CIFS_MAX_MSGSIZE;
212 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
213 inode = cifs_root_iget(sb);
214
215 if (IS_ERR(inode)) {
216 rc = PTR_ERR(inode);
217 goto out_no_root;
218 }
219
220 if (tcon->nocase)
221 sb->s_d_op = &cifs_ci_dentry_ops;
222 else
223 sb->s_d_op = &cifs_dentry_ops;
224
225 sb->s_root = d_make_root(inode);
226 if (!sb->s_root) {
227 rc = -ENOMEM;
228 goto out_no_root;
229 }
230
231 #ifdef CONFIG_CIFS_NFSD_EXPORT
232 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
233 cifs_dbg(FYI, "export ops supported\n");
234 sb->s_export_op = &cifs_export_ops;
235 }
236 #endif /* CONFIG_CIFS_NFSD_EXPORT */
237
238 return 0;
239
240 out_no_root:
241 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
242 return rc;
243 }
244
cifs_kill_sb(struct super_block * sb)245 static void cifs_kill_sb(struct super_block *sb)
246 {
247 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
248 kill_anon_super(sb);
249 cifs_umount(cifs_sb);
250 }
251
252 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)253 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
254 {
255 struct super_block *sb = dentry->d_sb;
256 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
257 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
258 struct TCP_Server_Info *server = tcon->ses->server;
259 unsigned int xid;
260 int rc = 0;
261
262 xid = get_xid();
263
264 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
265 buf->f_namelen =
266 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
267 else
268 buf->f_namelen = PATH_MAX;
269
270 buf->f_fsid.val[0] = tcon->vol_serial_number;
271 /* are using part of create time for more randomness, see man statfs */
272 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
273
274 buf->f_files = 0; /* undefined */
275 buf->f_ffree = 0; /* unlimited */
276
277 if (server->ops->queryfs)
278 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
279
280 free_xid(xid);
281 return rc;
282 }
283
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)284 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
285 {
286 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
287 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
288 struct TCP_Server_Info *server = tcon->ses->server;
289
290 if (server->ops->fallocate)
291 return server->ops->fallocate(file, tcon, mode, off, len);
292
293 return -EOPNOTSUPP;
294 }
295
cifs_permission(struct inode * inode,int mask)296 static int cifs_permission(struct inode *inode, int mask)
297 {
298 struct cifs_sb_info *cifs_sb;
299
300 cifs_sb = CIFS_SB(inode->i_sb);
301
302 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
303 if ((mask & MAY_EXEC) && !execute_ok(inode))
304 return -EACCES;
305 else
306 return 0;
307 } else /* file mode might have been restricted at mount time
308 on the client (above and beyond ACL on servers) for
309 servers which do not support setting and viewing mode bits,
310 so allowing client to check permissions is useful */
311 return generic_permission(inode, mask);
312 }
313
314 static struct kmem_cache *cifs_inode_cachep;
315 static struct kmem_cache *cifs_req_cachep;
316 static struct kmem_cache *cifs_mid_cachep;
317 static struct kmem_cache *cifs_sm_req_cachep;
318 mempool_t *cifs_sm_req_poolp;
319 mempool_t *cifs_req_poolp;
320 mempool_t *cifs_mid_poolp;
321
322 static struct inode *
cifs_alloc_inode(struct super_block * sb)323 cifs_alloc_inode(struct super_block *sb)
324 {
325 struct cifsInodeInfo *cifs_inode;
326 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
327 if (!cifs_inode)
328 return NULL;
329 cifs_inode->cifsAttrs = 0x20; /* default */
330 cifs_inode->time = 0;
331 /*
332 * Until the file is open and we have gotten oplock info back from the
333 * server, can not assume caching of file data or metadata.
334 */
335 cifs_set_oplock_level(cifs_inode, 0);
336 cifs_inode->flags = 0;
337 spin_lock_init(&cifs_inode->writers_lock);
338 cifs_inode->writers = 0;
339 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
340 cifs_inode->server_eof = 0;
341 cifs_inode->uniqueid = 0;
342 cifs_inode->createtime = 0;
343 cifs_inode->epoch = 0;
344 spin_lock_init(&cifs_inode->open_file_lock);
345 generate_random_uuid(cifs_inode->lease_key);
346
347 /*
348 * Can not set i_flags here - they get immediately overwritten to zero
349 * by the VFS.
350 */
351 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
352 INIT_LIST_HEAD(&cifs_inode->openFileList);
353 INIT_LIST_HEAD(&cifs_inode->llist);
354 return &cifs_inode->vfs_inode;
355 }
356
357 static void
cifs_free_inode(struct inode * inode)358 cifs_free_inode(struct inode *inode)
359 {
360 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
361 }
362
363 static void
cifs_evict_inode(struct inode * inode)364 cifs_evict_inode(struct inode *inode)
365 {
366 truncate_inode_pages_final(&inode->i_data);
367 clear_inode(inode);
368 cifs_fscache_release_inode_cookie(inode);
369 }
370
371 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)372 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
373 {
374 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
375 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
376
377 seq_puts(s, ",addr=");
378
379 switch (server->dstaddr.ss_family) {
380 case AF_INET:
381 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
382 break;
383 case AF_INET6:
384 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
385 if (sa6->sin6_scope_id)
386 seq_printf(s, "%%%u", sa6->sin6_scope_id);
387 break;
388 default:
389 seq_puts(s, "(unknown)");
390 }
391 if (server->rdma)
392 seq_puts(s, ",rdma");
393 }
394
395 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)396 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
397 {
398 if (ses->sectype == Unspecified) {
399 if (ses->user_name == NULL)
400 seq_puts(s, ",sec=none");
401 return;
402 }
403
404 seq_puts(s, ",sec=");
405
406 switch (ses->sectype) {
407 case LANMAN:
408 seq_puts(s, "lanman");
409 break;
410 case NTLMv2:
411 seq_puts(s, "ntlmv2");
412 break;
413 case NTLM:
414 seq_puts(s, "ntlm");
415 break;
416 case Kerberos:
417 seq_puts(s, "krb5");
418 break;
419 case RawNTLMSSP:
420 seq_puts(s, "ntlmssp");
421 break;
422 default:
423 /* shouldn't ever happen */
424 seq_puts(s, "unknown");
425 break;
426 }
427
428 if (ses->sign)
429 seq_puts(s, "i");
430
431 if (ses->sectype == Kerberos)
432 seq_printf(s, ",cruid=%u",
433 from_kuid_munged(&init_user_ns, ses->cred_uid));
434 }
435
436 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)437 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
438 {
439 seq_puts(s, ",cache=");
440
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
442 seq_puts(s, "strict");
443 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
444 seq_puts(s, "none");
445 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
446 seq_puts(s, "singleclient"); /* assume only one client access */
447 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
448 seq_puts(s, "ro"); /* read only caching assumed */
449 else
450 seq_puts(s, "loose");
451 }
452
453 static void
cifs_show_nls(struct seq_file * s,struct nls_table * cur)454 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
455 {
456 struct nls_table *def;
457
458 /* Display iocharset= option if it's not default charset */
459 def = load_nls_default();
460 if (def != cur)
461 seq_printf(s, ",iocharset=%s", cur->charset);
462 unload_nls(def);
463 }
464
465 /*
466 * cifs_show_options() is for displaying mount options in /proc/mounts.
467 * Not all settable options are displayed but most of the important
468 * ones are.
469 */
470 static int
cifs_show_options(struct seq_file * s,struct dentry * root)471 cifs_show_options(struct seq_file *s, struct dentry *root)
472 {
473 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
474 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
475 struct sockaddr *srcaddr;
476 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
477
478 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
479 cifs_show_security(s, tcon->ses);
480 cifs_show_cache_flavor(s, cifs_sb);
481
482 if (tcon->no_lease)
483 seq_puts(s, ",nolease");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
485 seq_puts(s, ",multiuser");
486 else if (tcon->ses->user_name)
487 seq_show_option(s, "username", tcon->ses->user_name);
488
489 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
490 seq_show_option(s, "domain", tcon->ses->domainName);
491
492 if (srcaddr->sa_family != AF_UNSPEC) {
493 struct sockaddr_in *saddr4;
494 struct sockaddr_in6 *saddr6;
495 saddr4 = (struct sockaddr_in *)srcaddr;
496 saddr6 = (struct sockaddr_in6 *)srcaddr;
497 if (srcaddr->sa_family == AF_INET6)
498 seq_printf(s, ",srcaddr=%pI6c",
499 &saddr6->sin6_addr);
500 else if (srcaddr->sa_family == AF_INET)
501 seq_printf(s, ",srcaddr=%pI4",
502 &saddr4->sin_addr.s_addr);
503 else
504 seq_printf(s, ",srcaddr=BAD-AF:%i",
505 (int)(srcaddr->sa_family));
506 }
507
508 seq_printf(s, ",uid=%u",
509 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
511 seq_puts(s, ",forceuid");
512 else
513 seq_puts(s, ",noforceuid");
514
515 seq_printf(s, ",gid=%u",
516 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
517 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
518 seq_puts(s, ",forcegid");
519 else
520 seq_puts(s, ",noforcegid");
521
522 cifs_show_address(s, tcon->ses->server);
523
524 if (!tcon->unix_ext)
525 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
526 cifs_sb->mnt_file_mode,
527 cifs_sb->mnt_dir_mode);
528
529 cifs_show_nls(s, cifs_sb->local_nls);
530
531 if (tcon->seal)
532 seq_puts(s, ",seal");
533 else if (tcon->ses->server->ignore_signature)
534 seq_puts(s, ",signloosely");
535 if (tcon->nocase)
536 seq_puts(s, ",nocase");
537 if (tcon->local_lease)
538 seq_puts(s, ",locallease");
539 if (tcon->retry)
540 seq_puts(s, ",hard");
541 else
542 seq_puts(s, ",soft");
543 if (tcon->use_persistent)
544 seq_puts(s, ",persistenthandles");
545 else if (tcon->use_resilient)
546 seq_puts(s, ",resilienthandles");
547 if (tcon->posix_extensions)
548 seq_puts(s, ",posix");
549 else if (tcon->unix_ext)
550 seq_puts(s, ",unix");
551 else
552 seq_puts(s, ",nounix");
553 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
554 seq_puts(s, ",nodfs");
555 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
556 seq_puts(s, ",posixpaths");
557 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
558 seq_puts(s, ",setuids");
559 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
560 seq_puts(s, ",idsfromsid");
561 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
562 seq_puts(s, ",serverino");
563 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
564 seq_puts(s, ",rwpidforward");
565 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
566 seq_puts(s, ",forcemand");
567 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
568 seq_puts(s, ",nouser_xattr");
569 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
570 seq_puts(s, ",mapchars");
571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
572 seq_puts(s, ",mapposix");
573 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
574 seq_puts(s, ",sfu");
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
576 seq_puts(s, ",nobrl");
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
578 seq_puts(s, ",nohandlecache");
579 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
580 seq_puts(s, ",modefromsid");
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
582 seq_puts(s, ",cifsacl");
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
584 seq_puts(s, ",dynperm");
585 if (root->d_sb->s_flags & SB_POSIXACL)
586 seq_puts(s, ",acl");
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
588 seq_puts(s, ",mfsymlinks");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
590 seq_puts(s, ",fsc");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
592 seq_puts(s, ",nostrictsync");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
594 seq_puts(s, ",noperm");
595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
596 seq_printf(s, ",backupuid=%u",
597 from_kuid_munged(&init_user_ns,
598 cifs_sb->mnt_backupuid));
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
600 seq_printf(s, ",backupgid=%u",
601 from_kgid_munged(&init_user_ns,
602 cifs_sb->mnt_backupgid));
603
604 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
605 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
606 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
607 if (tcon->ses->server->min_offload)
608 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
609 seq_printf(s, ",echo_interval=%lu",
610 tcon->ses->server->echo_interval / HZ);
611
612 /* Only display the following if overridden on mount */
613 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
614 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
615 if (tcon->ses->server->tcp_nodelay)
616 seq_puts(s, ",tcpnodelay");
617 if (tcon->ses->server->noautotune)
618 seq_puts(s, ",noautotune");
619 if (tcon->ses->server->noblocksnd)
620 seq_puts(s, ",noblocksend");
621
622 if (tcon->snapshot_time)
623 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
624 if (tcon->handle_timeout)
625 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
626 /* convert actimeo and display it in seconds */
627 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
628
629 return 0;
630 }
631
cifs_umount_begin(struct super_block * sb)632 static void cifs_umount_begin(struct super_block *sb)
633 {
634 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
635 struct cifs_tcon *tcon;
636
637 if (cifs_sb == NULL)
638 return;
639
640 tcon = cifs_sb_master_tcon(cifs_sb);
641
642 spin_lock(&cifs_tcp_ses_lock);
643 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
644 /* we have other mounts to same share or we have
645 already tried to force umount this and woken up
646 all waiting network requests, nothing to do */
647 spin_unlock(&cifs_tcp_ses_lock);
648 return;
649 } else if (tcon->tc_count == 1)
650 tcon->tidStatus = CifsExiting;
651 spin_unlock(&cifs_tcp_ses_lock);
652
653 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
654 /* cancel_notify_requests(tcon); */
655 if (tcon->ses && tcon->ses->server) {
656 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
657 wake_up_all(&tcon->ses->server->request_q);
658 wake_up_all(&tcon->ses->server->response_q);
659 msleep(1); /* yield */
660 /* we have to kick the requests once more */
661 wake_up_all(&tcon->ses->server->response_q);
662 msleep(1);
663 }
664
665 return;
666 }
667
668 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)669 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
670 {
671 /* BB FIXME */
672 return 0;
673 }
674 #endif
675
cifs_remount(struct super_block * sb,int * flags,char * data)676 static int cifs_remount(struct super_block *sb, int *flags, char *data)
677 {
678 sync_filesystem(sb);
679 *flags |= SB_NODIRATIME;
680 return 0;
681 }
682
cifs_drop_inode(struct inode * inode)683 static int cifs_drop_inode(struct inode *inode)
684 {
685 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
686
687 /* no serverino => unconditional eviction */
688 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
689 generic_drop_inode(inode);
690 }
691
692 static const struct super_operations cifs_super_ops = {
693 .statfs = cifs_statfs,
694 .alloc_inode = cifs_alloc_inode,
695 .free_inode = cifs_free_inode,
696 .drop_inode = cifs_drop_inode,
697 .evict_inode = cifs_evict_inode,
698 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
699 function unless later we add lazy close of inodes or unless the
700 kernel forgets to call us with the same number of releases (closes)
701 as opens */
702 .show_options = cifs_show_options,
703 .umount_begin = cifs_umount_begin,
704 .remount_fs = cifs_remount,
705 #ifdef CONFIG_CIFS_STATS2
706 .show_stats = cifs_show_stats,
707 #endif
708 };
709
710 /*
711 * Get root dentry from superblock according to prefix path mount option.
712 * Return dentry with refcount + 1 on success and NULL otherwise.
713 */
714 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)715 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
716 {
717 struct dentry *dentry;
718 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
719 char *full_path = NULL;
720 char *s, *p;
721 char sep;
722
723 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
724 return dget(sb->s_root);
725
726 full_path = cifs_build_path_to_root(vol, cifs_sb,
727 cifs_sb_master_tcon(cifs_sb), 0);
728 if (full_path == NULL)
729 return ERR_PTR(-ENOMEM);
730
731 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
732
733 sep = CIFS_DIR_SEP(cifs_sb);
734 dentry = dget(sb->s_root);
735 p = s = full_path;
736
737 do {
738 struct inode *dir = d_inode(dentry);
739 struct dentry *child;
740
741 if (!S_ISDIR(dir->i_mode)) {
742 dput(dentry);
743 dentry = ERR_PTR(-ENOTDIR);
744 break;
745 }
746
747 /* skip separators */
748 while (*s == sep)
749 s++;
750 if (!*s)
751 break;
752 p = s++;
753 /* next separator */
754 while (*s && *s != sep)
755 s++;
756
757 child = lookup_positive_unlocked(p, dentry, s - p);
758 dput(dentry);
759 dentry = child;
760 } while (!IS_ERR(dentry));
761 kfree(full_path);
762 return dentry;
763 }
764
cifs_set_super(struct super_block * sb,void * data)765 static int cifs_set_super(struct super_block *sb, void *data)
766 {
767 struct cifs_mnt_data *mnt_data = data;
768 sb->s_fs_info = mnt_data->cifs_sb;
769 return set_anon_super(sb, NULL);
770 }
771
772 static struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,bool is_smb3)773 cifs_smb3_do_mount(struct file_system_type *fs_type,
774 int flags, const char *dev_name, void *data, bool is_smb3)
775 {
776 int rc;
777 struct super_block *sb;
778 struct cifs_sb_info *cifs_sb;
779 struct smb_vol *volume_info;
780 struct cifs_mnt_data mnt_data;
781 struct dentry *root;
782
783 /*
784 * Prints in Kernel / CIFS log the attempted mount operation
785 * If CIFS_DEBUG && cifs_FYI
786 */
787 if (cifsFYI)
788 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
789 else
790 cifs_info("Attempting to mount %s\n", dev_name);
791
792 volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
793 if (IS_ERR(volume_info))
794 return ERR_CAST(volume_info);
795
796 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
797 if (cifs_sb == NULL) {
798 root = ERR_PTR(-ENOMEM);
799 goto out_nls;
800 }
801
802 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
803 if (cifs_sb->mountdata == NULL) {
804 root = ERR_PTR(-ENOMEM);
805 goto out_free;
806 }
807
808 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
809 if (rc) {
810 root = ERR_PTR(rc);
811 goto out_free;
812 }
813
814 rc = cifs_mount(cifs_sb, volume_info);
815 if (rc) {
816 if (!(flags & SB_SILENT))
817 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
818 rc);
819 root = ERR_PTR(rc);
820 goto out_free;
821 }
822
823 mnt_data.vol = volume_info;
824 mnt_data.cifs_sb = cifs_sb;
825 mnt_data.flags = flags;
826
827 /* BB should we make this contingent on mount parm? */
828 flags |= SB_NODIRATIME | SB_NOATIME;
829
830 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
831 if (IS_ERR(sb)) {
832 root = ERR_CAST(sb);
833 cifs_umount(cifs_sb);
834 goto out;
835 }
836
837 if (sb->s_root) {
838 cifs_dbg(FYI, "Use existing superblock\n");
839 cifs_umount(cifs_sb);
840 } else {
841 rc = cifs_read_super(sb);
842 if (rc) {
843 root = ERR_PTR(rc);
844 goto out_super;
845 }
846
847 sb->s_flags |= SB_ACTIVE;
848 }
849
850 root = cifs_get_root(volume_info, sb);
851 if (IS_ERR(root))
852 goto out_super;
853
854 cifs_dbg(FYI, "dentry root is: %p\n", root);
855 goto out;
856
857 out_super:
858 deactivate_locked_super(sb);
859 return root;
860 out:
861 cifs_cleanup_volume_info(volume_info);
862 return root;
863
864 out_free:
865 kfree(cifs_sb->prepath);
866 kfree(cifs_sb->mountdata);
867 kfree(cifs_sb);
868 out_nls:
869 unload_nls(volume_info->local_nls);
870 goto out;
871 }
872
873 static struct dentry *
smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)874 smb3_do_mount(struct file_system_type *fs_type,
875 int flags, const char *dev_name, void *data)
876 {
877 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, true);
878 }
879
880 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)881 cifs_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, false);
885 }
886
887 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)888 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
889 {
890 ssize_t rc;
891 struct inode *inode = file_inode(iocb->ki_filp);
892
893 if (iocb->ki_flags & IOCB_DIRECT)
894 return cifs_user_readv(iocb, iter);
895
896 rc = cifs_revalidate_mapping(inode);
897 if (rc)
898 return rc;
899
900 return generic_file_read_iter(iocb, iter);
901 }
902
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)903 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
904 {
905 struct inode *inode = file_inode(iocb->ki_filp);
906 struct cifsInodeInfo *cinode = CIFS_I(inode);
907 ssize_t written;
908 int rc;
909
910 if (iocb->ki_filp->f_flags & O_DIRECT) {
911 written = cifs_user_writev(iocb, from);
912 if (written > 0 && CIFS_CACHE_READ(cinode)) {
913 cifs_zap_mapping(inode);
914 cifs_dbg(FYI,
915 "Set no oplock for inode=%p after a write operation\n",
916 inode);
917 cinode->oplock = 0;
918 }
919 return written;
920 }
921
922 written = cifs_get_writer(cinode);
923 if (written)
924 return written;
925
926 written = generic_file_write_iter(iocb, from);
927
928 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
929 goto out;
930
931 rc = filemap_fdatawrite(inode->i_mapping);
932 if (rc)
933 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
934 rc, inode);
935
936 out:
937 cifs_put_writer(cinode);
938 return written;
939 }
940
cifs_llseek(struct file * file,loff_t offset,int whence)941 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
942 {
943 struct cifsFileInfo *cfile = file->private_data;
944 struct cifs_tcon *tcon;
945
946 /*
947 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
948 * the cached file length
949 */
950 if (whence != SEEK_SET && whence != SEEK_CUR) {
951 int rc;
952 struct inode *inode = file_inode(file);
953
954 /*
955 * We need to be sure that all dirty pages are written and the
956 * server has the newest file length.
957 */
958 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
959 inode->i_mapping->nrpages != 0) {
960 rc = filemap_fdatawait(inode->i_mapping);
961 if (rc) {
962 mapping_set_error(inode->i_mapping, rc);
963 return rc;
964 }
965 }
966 /*
967 * Some applications poll for the file length in this strange
968 * way so we must seek to end on non-oplocked files by
969 * setting the revalidate time to zero.
970 */
971 CIFS_I(inode)->time = 0;
972
973 rc = cifs_revalidate_file_attr(file);
974 if (rc < 0)
975 return (loff_t)rc;
976 }
977 if (cfile && cfile->tlink) {
978 tcon = tlink_tcon(cfile->tlink);
979 if (tcon->ses->server->ops->llseek)
980 return tcon->ses->server->ops->llseek(file, tcon,
981 offset, whence);
982 }
983 return generic_file_llseek(file, offset, whence);
984 }
985
986 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)987 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
988 {
989 /*
990 * Note that this is called by vfs setlease with i_lock held to
991 * protect *lease from going away.
992 */
993 struct inode *inode = file_inode(file);
994 struct cifsFileInfo *cfile = file->private_data;
995
996 if (!(S_ISREG(inode->i_mode)))
997 return -EINVAL;
998
999 /* Check if file is oplocked if this is request for new lease */
1000 if (arg == F_UNLCK ||
1001 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1002 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1003 return generic_setlease(file, arg, lease, priv);
1004 else if (tlink_tcon(cfile->tlink)->local_lease &&
1005 !CIFS_CACHE_READ(CIFS_I(inode)))
1006 /*
1007 * If the server claims to support oplock on this file, then we
1008 * still need to check oplock even if the local_lease mount
1009 * option is set, but there are servers which do not support
1010 * oplock for which this mount option may be useful if the user
1011 * knows that the file won't be changed on the server by anyone
1012 * else.
1013 */
1014 return generic_setlease(file, arg, lease, priv);
1015 else
1016 return -EAGAIN;
1017 }
1018
1019 struct file_system_type cifs_fs_type = {
1020 .owner = THIS_MODULE,
1021 .name = "cifs",
1022 .mount = cifs_do_mount,
1023 .kill_sb = cifs_kill_sb,
1024 /* .fs_flags */
1025 };
1026 MODULE_ALIAS_FS("cifs");
1027
1028 static struct file_system_type smb3_fs_type = {
1029 .owner = THIS_MODULE,
1030 .name = "smb3",
1031 .mount = smb3_do_mount,
1032 .kill_sb = cifs_kill_sb,
1033 /* .fs_flags */
1034 };
1035 MODULE_ALIAS_FS("smb3");
1036 MODULE_ALIAS("smb3");
1037
1038 const struct inode_operations cifs_dir_inode_ops = {
1039 .create = cifs_create,
1040 .atomic_open = cifs_atomic_open,
1041 .lookup = cifs_lookup,
1042 .getattr = cifs_getattr,
1043 .unlink = cifs_unlink,
1044 .link = cifs_hardlink,
1045 .mkdir = cifs_mkdir,
1046 .rmdir = cifs_rmdir,
1047 .rename = cifs_rename2,
1048 .permission = cifs_permission,
1049 .setattr = cifs_setattr,
1050 .symlink = cifs_symlink,
1051 .mknod = cifs_mknod,
1052 .listxattr = cifs_listxattr,
1053 };
1054
1055 const struct inode_operations cifs_file_inode_ops = {
1056 .setattr = cifs_setattr,
1057 .getattr = cifs_getattr,
1058 .permission = cifs_permission,
1059 .listxattr = cifs_listxattr,
1060 .fiemap = cifs_fiemap,
1061 };
1062
1063 const struct inode_operations cifs_symlink_inode_ops = {
1064 .get_link = cifs_get_link,
1065 .setattr = cifs_setattr,
1066 .permission = cifs_permission,
1067 .listxattr = cifs_listxattr,
1068 };
1069
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)1070 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1071 struct file *dst_file, loff_t destoff, loff_t len,
1072 unsigned int remap_flags)
1073 {
1074 struct inode *src_inode = file_inode(src_file);
1075 struct inode *target_inode = file_inode(dst_file);
1076 struct cifsFileInfo *smb_file_src = src_file->private_data;
1077 struct cifsFileInfo *smb_file_target;
1078 struct cifs_tcon *target_tcon;
1079 unsigned int xid;
1080 int rc;
1081
1082 if (remap_flags & REMAP_FILE_DEDUP)
1083 return -EOPNOTSUPP;
1084 if (remap_flags & ~REMAP_FILE_ADVISORY)
1085 return -EINVAL;
1086
1087 cifs_dbg(FYI, "clone range\n");
1088
1089 xid = get_xid();
1090
1091 if (!src_file->private_data || !dst_file->private_data) {
1092 rc = -EBADF;
1093 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1094 goto out;
1095 }
1096
1097 smb_file_target = dst_file->private_data;
1098 target_tcon = tlink_tcon(smb_file_target->tlink);
1099
1100 /*
1101 * Note: cifs case is easier than btrfs since server responsible for
1102 * checks for proper open modes and file type and if it wants
1103 * server could even support copy of range where source = target
1104 */
1105 lock_two_nondirectories(target_inode, src_inode);
1106
1107 if (len == 0)
1108 len = src_inode->i_size - off;
1109
1110 cifs_dbg(FYI, "about to flush pages\n");
1111 /* should we flush first and last page first */
1112 truncate_inode_pages_range(&target_inode->i_data, destoff,
1113 PAGE_ALIGN(destoff + len)-1);
1114
1115 if (target_tcon->ses->server->ops->duplicate_extents)
1116 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1117 smb_file_src, smb_file_target, off, len, destoff);
1118 else
1119 rc = -EOPNOTSUPP;
1120
1121 /* force revalidate of size and timestamps of target file now
1122 that target is updated on the server */
1123 CIFS_I(target_inode)->time = 0;
1124 /* although unlocking in the reverse order from locking is not
1125 strictly necessary here it is a little cleaner to be consistent */
1126 unlock_two_nondirectories(src_inode, target_inode);
1127 out:
1128 free_xid(xid);
1129 return rc < 0 ? rc : len;
1130 }
1131
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)1132 ssize_t cifs_file_copychunk_range(unsigned int xid,
1133 struct file *src_file, loff_t off,
1134 struct file *dst_file, loff_t destoff,
1135 size_t len, unsigned int flags)
1136 {
1137 struct inode *src_inode = file_inode(src_file);
1138 struct inode *target_inode = file_inode(dst_file);
1139 struct cifsFileInfo *smb_file_src;
1140 struct cifsFileInfo *smb_file_target;
1141 struct cifs_tcon *src_tcon;
1142 struct cifs_tcon *target_tcon;
1143 ssize_t rc;
1144
1145 cifs_dbg(FYI, "copychunk range\n");
1146
1147 if (!src_file->private_data || !dst_file->private_data) {
1148 rc = -EBADF;
1149 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1150 goto out;
1151 }
1152
1153 rc = -EXDEV;
1154 smb_file_target = dst_file->private_data;
1155 smb_file_src = src_file->private_data;
1156 src_tcon = tlink_tcon(smb_file_src->tlink);
1157 target_tcon = tlink_tcon(smb_file_target->tlink);
1158
1159 if (src_tcon->ses != target_tcon->ses) {
1160 cifs_dbg(VFS, "source and target of copy not on same server\n");
1161 goto out;
1162 }
1163
1164 rc = -EOPNOTSUPP;
1165 if (!target_tcon->ses->server->ops->copychunk_range)
1166 goto out;
1167
1168 /*
1169 * Note: cifs case is easier than btrfs since server responsible for
1170 * checks for proper open modes and file type and if it wants
1171 * server could even support copy of range where source = target
1172 */
1173 lock_two_nondirectories(target_inode, src_inode);
1174
1175 cifs_dbg(FYI, "about to flush pages\n");
1176 /* should we flush first and last page first */
1177 truncate_inode_pages(&target_inode->i_data, 0);
1178
1179 rc = file_modified(dst_file);
1180 if (!rc)
1181 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1182 smb_file_src, smb_file_target, off, len, destoff);
1183
1184 file_accessed(src_file);
1185
1186 /* force revalidate of size and timestamps of target file now
1187 * that target is updated on the server
1188 */
1189 CIFS_I(target_inode)->time = 0;
1190 /* although unlocking in the reverse order from locking is not
1191 * strictly necessary here it is a little cleaner to be consistent
1192 */
1193 unlock_two_nondirectories(src_inode, target_inode);
1194
1195 out:
1196 return rc;
1197 }
1198
1199 /*
1200 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1201 * is a dummy operation.
1202 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1203 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1204 {
1205 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1206 file, datasync);
1207
1208 return 0;
1209 }
1210
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1211 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1212 struct file *dst_file, loff_t destoff,
1213 size_t len, unsigned int flags)
1214 {
1215 unsigned int xid = get_xid();
1216 ssize_t rc;
1217
1218 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1219 len, flags);
1220 free_xid(xid);
1221
1222 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1223 rc = generic_copy_file_range(src_file, off, dst_file,
1224 destoff, len, flags);
1225 return rc;
1226 }
1227
1228 const struct file_operations cifs_file_ops = {
1229 .read_iter = cifs_loose_read_iter,
1230 .write_iter = cifs_file_write_iter,
1231 .open = cifs_open,
1232 .release = cifs_close,
1233 .lock = cifs_lock,
1234 .fsync = cifs_fsync,
1235 .flush = cifs_flush,
1236 .mmap = cifs_file_mmap,
1237 .splice_read = generic_file_splice_read,
1238 .splice_write = iter_file_splice_write,
1239 .llseek = cifs_llseek,
1240 .unlocked_ioctl = cifs_ioctl,
1241 .copy_file_range = cifs_copy_file_range,
1242 .remap_file_range = cifs_remap_file_range,
1243 .setlease = cifs_setlease,
1244 .fallocate = cifs_fallocate,
1245 };
1246
1247 const struct file_operations cifs_file_strict_ops = {
1248 .read_iter = cifs_strict_readv,
1249 .write_iter = cifs_strict_writev,
1250 .open = cifs_open,
1251 .release = cifs_close,
1252 .lock = cifs_lock,
1253 .fsync = cifs_strict_fsync,
1254 .flush = cifs_flush,
1255 .mmap = cifs_file_strict_mmap,
1256 .splice_read = generic_file_splice_read,
1257 .splice_write = iter_file_splice_write,
1258 .llseek = cifs_llseek,
1259 .unlocked_ioctl = cifs_ioctl,
1260 .copy_file_range = cifs_copy_file_range,
1261 .remap_file_range = cifs_remap_file_range,
1262 .setlease = cifs_setlease,
1263 .fallocate = cifs_fallocate,
1264 };
1265
1266 const struct file_operations cifs_file_direct_ops = {
1267 .read_iter = cifs_direct_readv,
1268 .write_iter = cifs_direct_writev,
1269 .open = cifs_open,
1270 .release = cifs_close,
1271 .lock = cifs_lock,
1272 .fsync = cifs_fsync,
1273 .flush = cifs_flush,
1274 .mmap = cifs_file_mmap,
1275 .splice_read = generic_file_splice_read,
1276 .splice_write = iter_file_splice_write,
1277 .unlocked_ioctl = cifs_ioctl,
1278 .copy_file_range = cifs_copy_file_range,
1279 .remap_file_range = cifs_remap_file_range,
1280 .llseek = cifs_llseek,
1281 .setlease = cifs_setlease,
1282 .fallocate = cifs_fallocate,
1283 };
1284
1285 const struct file_operations cifs_file_nobrl_ops = {
1286 .read_iter = cifs_loose_read_iter,
1287 .write_iter = cifs_file_write_iter,
1288 .open = cifs_open,
1289 .release = cifs_close,
1290 .fsync = cifs_fsync,
1291 .flush = cifs_flush,
1292 .mmap = cifs_file_mmap,
1293 .splice_read = generic_file_splice_read,
1294 .splice_write = iter_file_splice_write,
1295 .llseek = cifs_llseek,
1296 .unlocked_ioctl = cifs_ioctl,
1297 .copy_file_range = cifs_copy_file_range,
1298 .remap_file_range = cifs_remap_file_range,
1299 .setlease = cifs_setlease,
1300 .fallocate = cifs_fallocate,
1301 };
1302
1303 const struct file_operations cifs_file_strict_nobrl_ops = {
1304 .read_iter = cifs_strict_readv,
1305 .write_iter = cifs_strict_writev,
1306 .open = cifs_open,
1307 .release = cifs_close,
1308 .fsync = cifs_strict_fsync,
1309 .flush = cifs_flush,
1310 .mmap = cifs_file_strict_mmap,
1311 .splice_read = generic_file_splice_read,
1312 .splice_write = iter_file_splice_write,
1313 .llseek = cifs_llseek,
1314 .unlocked_ioctl = cifs_ioctl,
1315 .copy_file_range = cifs_copy_file_range,
1316 .remap_file_range = cifs_remap_file_range,
1317 .setlease = cifs_setlease,
1318 .fallocate = cifs_fallocate,
1319 };
1320
1321 const struct file_operations cifs_file_direct_nobrl_ops = {
1322 .read_iter = cifs_direct_readv,
1323 .write_iter = cifs_direct_writev,
1324 .open = cifs_open,
1325 .release = cifs_close,
1326 .fsync = cifs_fsync,
1327 .flush = cifs_flush,
1328 .mmap = cifs_file_mmap,
1329 .splice_read = generic_file_splice_read,
1330 .splice_write = iter_file_splice_write,
1331 .unlocked_ioctl = cifs_ioctl,
1332 .copy_file_range = cifs_copy_file_range,
1333 .remap_file_range = cifs_remap_file_range,
1334 .llseek = cifs_llseek,
1335 .setlease = cifs_setlease,
1336 .fallocate = cifs_fallocate,
1337 };
1338
1339 const struct file_operations cifs_dir_ops = {
1340 .iterate_shared = cifs_readdir,
1341 .release = cifs_closedir,
1342 .read = generic_read_dir,
1343 .unlocked_ioctl = cifs_ioctl,
1344 .copy_file_range = cifs_copy_file_range,
1345 .remap_file_range = cifs_remap_file_range,
1346 .llseek = generic_file_llseek,
1347 .fsync = cifs_dir_fsync,
1348 };
1349
1350 static void
cifs_init_once(void * inode)1351 cifs_init_once(void *inode)
1352 {
1353 struct cifsInodeInfo *cifsi = inode;
1354
1355 inode_init_once(&cifsi->vfs_inode);
1356 init_rwsem(&cifsi->lock_sem);
1357 }
1358
1359 static int __init
cifs_init_inodecache(void)1360 cifs_init_inodecache(void)
1361 {
1362 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1363 sizeof(struct cifsInodeInfo),
1364 0, (SLAB_RECLAIM_ACCOUNT|
1365 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1366 cifs_init_once);
1367 if (cifs_inode_cachep == NULL)
1368 return -ENOMEM;
1369
1370 return 0;
1371 }
1372
1373 static void
cifs_destroy_inodecache(void)1374 cifs_destroy_inodecache(void)
1375 {
1376 /*
1377 * Make sure all delayed rcu free inodes are flushed before we
1378 * destroy cache.
1379 */
1380 rcu_barrier();
1381 kmem_cache_destroy(cifs_inode_cachep);
1382 }
1383
1384 static int
cifs_init_request_bufs(void)1385 cifs_init_request_bufs(void)
1386 {
1387 /*
1388 * SMB2 maximum header size is bigger than CIFS one - no problems to
1389 * allocate some more bytes for CIFS.
1390 */
1391 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1392
1393 if (CIFSMaxBufSize < 8192) {
1394 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1395 Unicode path name has to fit in any SMB/CIFS path based frames */
1396 CIFSMaxBufSize = 8192;
1397 } else if (CIFSMaxBufSize > 1024*127) {
1398 CIFSMaxBufSize = 1024 * 127;
1399 } else {
1400 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1401 }
1402 /*
1403 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1404 CIFSMaxBufSize, CIFSMaxBufSize);
1405 */
1406 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1407 CIFSMaxBufSize + max_hdr_size, 0,
1408 SLAB_HWCACHE_ALIGN, 0,
1409 CIFSMaxBufSize + max_hdr_size,
1410 NULL);
1411 if (cifs_req_cachep == NULL)
1412 return -ENOMEM;
1413
1414 if (cifs_min_rcv < 1)
1415 cifs_min_rcv = 1;
1416 else if (cifs_min_rcv > 64) {
1417 cifs_min_rcv = 64;
1418 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1419 }
1420
1421 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1422 cifs_req_cachep);
1423
1424 if (cifs_req_poolp == NULL) {
1425 kmem_cache_destroy(cifs_req_cachep);
1426 return -ENOMEM;
1427 }
1428 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1429 almost all handle based requests (but not write response, nor is it
1430 sufficient for path based requests). A smaller size would have
1431 been more efficient (compacting multiple slab items on one 4k page)
1432 for the case in which debug was on, but this larger size allows
1433 more SMBs to use small buffer alloc and is still much more
1434 efficient to alloc 1 per page off the slab compared to 17K (5page)
1435 alloc of large cifs buffers even when page debugging is on */
1436 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1437 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1438 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1439 if (cifs_sm_req_cachep == NULL) {
1440 mempool_destroy(cifs_req_poolp);
1441 kmem_cache_destroy(cifs_req_cachep);
1442 return -ENOMEM;
1443 }
1444
1445 if (cifs_min_small < 2)
1446 cifs_min_small = 2;
1447 else if (cifs_min_small > 256) {
1448 cifs_min_small = 256;
1449 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1450 }
1451
1452 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1453 cifs_sm_req_cachep);
1454
1455 if (cifs_sm_req_poolp == NULL) {
1456 mempool_destroy(cifs_req_poolp);
1457 kmem_cache_destroy(cifs_req_cachep);
1458 kmem_cache_destroy(cifs_sm_req_cachep);
1459 return -ENOMEM;
1460 }
1461
1462 return 0;
1463 }
1464
1465 static void
cifs_destroy_request_bufs(void)1466 cifs_destroy_request_bufs(void)
1467 {
1468 mempool_destroy(cifs_req_poolp);
1469 kmem_cache_destroy(cifs_req_cachep);
1470 mempool_destroy(cifs_sm_req_poolp);
1471 kmem_cache_destroy(cifs_sm_req_cachep);
1472 }
1473
1474 static int
cifs_init_mids(void)1475 cifs_init_mids(void)
1476 {
1477 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1478 sizeof(struct mid_q_entry), 0,
1479 SLAB_HWCACHE_ALIGN, NULL);
1480 if (cifs_mid_cachep == NULL)
1481 return -ENOMEM;
1482
1483 /* 3 is a reasonable minimum number of simultaneous operations */
1484 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1485 if (cifs_mid_poolp == NULL) {
1486 kmem_cache_destroy(cifs_mid_cachep);
1487 return -ENOMEM;
1488 }
1489
1490 return 0;
1491 }
1492
1493 static void
cifs_destroy_mids(void)1494 cifs_destroy_mids(void)
1495 {
1496 mempool_destroy(cifs_mid_poolp);
1497 kmem_cache_destroy(cifs_mid_cachep);
1498 }
1499
1500 static int __init
init_cifs(void)1501 init_cifs(void)
1502 {
1503 int rc = 0;
1504 cifs_proc_init();
1505 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1506 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1507 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1508 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1509 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1510 /*
1511 * Initialize Global counters
1512 */
1513 atomic_set(&sesInfoAllocCount, 0);
1514 atomic_set(&tconInfoAllocCount, 0);
1515 atomic_set(&tcpSesAllocCount, 0);
1516 atomic_set(&tcpSesReconnectCount, 0);
1517 atomic_set(&tconInfoReconnectCount, 0);
1518
1519 atomic_set(&bufAllocCount, 0);
1520 atomic_set(&smBufAllocCount, 0);
1521 #ifdef CONFIG_CIFS_STATS2
1522 atomic_set(&totBufAllocCount, 0);
1523 atomic_set(&totSmBufAllocCount, 0);
1524 if (slow_rsp_threshold < 1)
1525 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1526 else if (slow_rsp_threshold > 32767)
1527 cifs_dbg(VFS,
1528 "slow response threshold set higher than recommended (0 to 32767)\n");
1529 #endif /* CONFIG_CIFS_STATS2 */
1530
1531 atomic_set(&midCount, 0);
1532 GlobalCurrentXid = 0;
1533 GlobalTotalActiveXid = 0;
1534 GlobalMaxActiveXid = 0;
1535 spin_lock_init(&cifs_tcp_ses_lock);
1536 spin_lock_init(&GlobalMid_Lock);
1537
1538 cifs_lock_secret = get_random_u32();
1539
1540 if (cifs_max_pending < 2) {
1541 cifs_max_pending = 2;
1542 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1543 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1544 cifs_max_pending = CIFS_MAX_REQ;
1545 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1546 CIFS_MAX_REQ);
1547 }
1548
1549 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1550 if (!cifsiod_wq) {
1551 rc = -ENOMEM;
1552 goto out_clean_proc;
1553 }
1554
1555 /*
1556 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1557 * so that we don't launch too many worker threads but
1558 * Documentation/workqueue.txt recommends setting it to 0
1559 */
1560
1561 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1562 decrypt_wq = alloc_workqueue("smb3decryptd",
1563 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1564 if (!decrypt_wq) {
1565 rc = -ENOMEM;
1566 goto out_destroy_cifsiod_wq;
1567 }
1568
1569 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1570 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1571 if (!fileinfo_put_wq) {
1572 rc = -ENOMEM;
1573 goto out_destroy_decrypt_wq;
1574 }
1575
1576 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1577 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1578 if (!cifsoplockd_wq) {
1579 rc = -ENOMEM;
1580 goto out_destroy_fileinfo_put_wq;
1581 }
1582
1583 rc = cifs_fscache_register();
1584 if (rc)
1585 goto out_destroy_cifsoplockd_wq;
1586
1587 rc = cifs_init_inodecache();
1588 if (rc)
1589 goto out_unreg_fscache;
1590
1591 rc = cifs_init_mids();
1592 if (rc)
1593 goto out_destroy_inodecache;
1594
1595 rc = cifs_init_request_bufs();
1596 if (rc)
1597 goto out_destroy_mids;
1598
1599 #ifdef CONFIG_CIFS_DFS_UPCALL
1600 rc = dfs_cache_init();
1601 if (rc)
1602 goto out_destroy_request_bufs;
1603 #endif /* CONFIG_CIFS_DFS_UPCALL */
1604 #ifdef CONFIG_CIFS_UPCALL
1605 rc = init_cifs_spnego();
1606 if (rc)
1607 goto out_destroy_dfs_cache;
1608 #endif /* CONFIG_CIFS_UPCALL */
1609
1610 rc = init_cifs_idmap();
1611 if (rc)
1612 goto out_register_key_type;
1613
1614 rc = register_filesystem(&cifs_fs_type);
1615 if (rc)
1616 goto out_init_cifs_idmap;
1617
1618 rc = register_filesystem(&smb3_fs_type);
1619 if (rc) {
1620 unregister_filesystem(&cifs_fs_type);
1621 goto out_init_cifs_idmap;
1622 }
1623
1624 return 0;
1625
1626 out_init_cifs_idmap:
1627 exit_cifs_idmap();
1628 out_register_key_type:
1629 #ifdef CONFIG_CIFS_UPCALL
1630 exit_cifs_spnego();
1631 out_destroy_dfs_cache:
1632 #endif
1633 #ifdef CONFIG_CIFS_DFS_UPCALL
1634 dfs_cache_destroy();
1635 out_destroy_request_bufs:
1636 #endif
1637 cifs_destroy_request_bufs();
1638 out_destroy_mids:
1639 cifs_destroy_mids();
1640 out_destroy_inodecache:
1641 cifs_destroy_inodecache();
1642 out_unreg_fscache:
1643 cifs_fscache_unregister();
1644 out_destroy_cifsoplockd_wq:
1645 destroy_workqueue(cifsoplockd_wq);
1646 out_destroy_fileinfo_put_wq:
1647 destroy_workqueue(fileinfo_put_wq);
1648 out_destroy_decrypt_wq:
1649 destroy_workqueue(decrypt_wq);
1650 out_destroy_cifsiod_wq:
1651 destroy_workqueue(cifsiod_wq);
1652 out_clean_proc:
1653 cifs_proc_clean();
1654 return rc;
1655 }
1656
1657 static void __exit
exit_cifs(void)1658 exit_cifs(void)
1659 {
1660 cifs_dbg(NOISY, "exit_smb3\n");
1661 unregister_filesystem(&cifs_fs_type);
1662 unregister_filesystem(&smb3_fs_type);
1663 cifs_dfs_release_automount_timer();
1664 exit_cifs_idmap();
1665 #ifdef CONFIG_CIFS_UPCALL
1666 exit_cifs_spnego();
1667 #endif
1668 #ifdef CONFIG_CIFS_DFS_UPCALL
1669 dfs_cache_destroy();
1670 #endif
1671 cifs_destroy_request_bufs();
1672 cifs_destroy_mids();
1673 cifs_destroy_inodecache();
1674 cifs_fscache_unregister();
1675 destroy_workqueue(cifsoplockd_wq);
1676 destroy_workqueue(decrypt_wq);
1677 destroy_workqueue(fileinfo_put_wq);
1678 destroy_workqueue(cifsiod_wq);
1679 cifs_proc_clean();
1680 }
1681
1682 MODULE_AUTHOR("Steve French");
1683 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1684 MODULE_DESCRIPTION
1685 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1686 "also older servers complying with the SNIA CIFS Specification)");
1687 MODULE_VERSION(CIFS_VERSION);
1688 MODULE_SOFTDEP("pre: ecb");
1689 MODULE_SOFTDEP("pre: hmac");
1690 MODULE_SOFTDEP("pre: md4");
1691 MODULE_SOFTDEP("pre: md5");
1692 MODULE_SOFTDEP("pre: nls");
1693 MODULE_SOFTDEP("pre: aes");
1694 MODULE_SOFTDEP("pre: cmac");
1695 MODULE_SOFTDEP("pre: sha256");
1696 MODULE_SOFTDEP("pre: sha512");
1697 MODULE_SOFTDEP("pre: aead2");
1698 MODULE_SOFTDEP("pre: ccm");
1699 MODULE_SOFTDEP("pre: gcm");
1700 module_init(init_cifs)
1701 module_exit(exit_cifs)
1702