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, buf);
279
280 free_xid(xid);
281 return 0;
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_printf(s, "krb5,cruid=%u", from_kuid_munged(&init_user_ns,ses->cred_uid));
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
432 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)433 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
434 {
435 seq_puts(s, ",cache=");
436
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
438 seq_puts(s, "strict");
439 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
440 seq_puts(s, "none");
441 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
442 seq_puts(s, "singleclient"); /* assume only one client access */
443 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
444 seq_puts(s, "ro"); /* read only caching assumed */
445 else
446 seq_puts(s, "loose");
447 }
448
449 static void
cifs_show_nls(struct seq_file * s,struct nls_table * cur)450 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
451 {
452 struct nls_table *def;
453
454 /* Display iocharset= option if it's not default charset */
455 def = load_nls_default();
456 if (def != cur)
457 seq_printf(s, ",iocharset=%s", cur->charset);
458 unload_nls(def);
459 }
460
461 /*
462 * cifs_show_options() is for displaying mount options in /proc/mounts.
463 * Not all settable options are displayed but most of the important
464 * ones are.
465 */
466 static int
cifs_show_options(struct seq_file * s,struct dentry * root)467 cifs_show_options(struct seq_file *s, struct dentry *root)
468 {
469 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
470 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
471 struct sockaddr *srcaddr;
472 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
473
474 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
475 cifs_show_security(s, tcon->ses);
476 cifs_show_cache_flavor(s, cifs_sb);
477
478 if (tcon->no_lease)
479 seq_puts(s, ",nolease");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
481 seq_puts(s, ",multiuser");
482 else if (tcon->ses->user_name)
483 seq_show_option(s, "username", tcon->ses->user_name);
484
485 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
486 seq_show_option(s, "domain", tcon->ses->domainName);
487
488 if (srcaddr->sa_family != AF_UNSPEC) {
489 struct sockaddr_in *saddr4;
490 struct sockaddr_in6 *saddr6;
491 saddr4 = (struct sockaddr_in *)srcaddr;
492 saddr6 = (struct sockaddr_in6 *)srcaddr;
493 if (srcaddr->sa_family == AF_INET6)
494 seq_printf(s, ",srcaddr=%pI6c",
495 &saddr6->sin6_addr);
496 else if (srcaddr->sa_family == AF_INET)
497 seq_printf(s, ",srcaddr=%pI4",
498 &saddr4->sin_addr.s_addr);
499 else
500 seq_printf(s, ",srcaddr=BAD-AF:%i",
501 (int)(srcaddr->sa_family));
502 }
503
504 seq_printf(s, ",uid=%u",
505 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
507 seq_puts(s, ",forceuid");
508 else
509 seq_puts(s, ",noforceuid");
510
511 seq_printf(s, ",gid=%u",
512 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
513 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
514 seq_puts(s, ",forcegid");
515 else
516 seq_puts(s, ",noforcegid");
517
518 cifs_show_address(s, tcon->ses->server);
519
520 if (!tcon->unix_ext)
521 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
522 cifs_sb->mnt_file_mode,
523 cifs_sb->mnt_dir_mode);
524
525 cifs_show_nls(s, cifs_sb->local_nls);
526
527 if (tcon->seal)
528 seq_puts(s, ",seal");
529 if (tcon->nocase)
530 seq_puts(s, ",nocase");
531 if (tcon->local_lease)
532 seq_puts(s, ",locallease");
533 if (tcon->retry)
534 seq_puts(s, ",hard");
535 else
536 seq_puts(s, ",soft");
537 if (tcon->use_persistent)
538 seq_puts(s, ",persistenthandles");
539 else if (tcon->use_resilient)
540 seq_puts(s, ",resilienthandles");
541 if (tcon->posix_extensions)
542 seq_puts(s, ",posix");
543 else if (tcon->unix_ext)
544 seq_puts(s, ",unix");
545 else
546 seq_puts(s, ",nounix");
547 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
548 seq_puts(s, ",nodfs");
549 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
550 seq_puts(s, ",posixpaths");
551 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
552 seq_puts(s, ",setuids");
553 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
554 seq_puts(s, ",idsfromsid");
555 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
556 seq_puts(s, ",serverino");
557 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
558 seq_puts(s, ",rwpidforward");
559 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
560 seq_puts(s, ",forcemand");
561 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
562 seq_puts(s, ",nouser_xattr");
563 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
564 seq_puts(s, ",mapchars");
565 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
566 seq_puts(s, ",mapposix");
567 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
568 seq_puts(s, ",sfu");
569 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
570 seq_puts(s, ",nobrl");
571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
572 seq_puts(s, ",nohandlecache");
573 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
574 seq_puts(s, ",modefromsid");
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
576 seq_puts(s, ",cifsacl");
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
578 seq_puts(s, ",dynperm");
579 if (root->d_sb->s_flags & SB_POSIXACL)
580 seq_puts(s, ",acl");
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
582 seq_puts(s, ",mfsymlinks");
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
584 seq_puts(s, ",fsc");
585 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
586 seq_puts(s, ",nostrictsync");
587 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
588 seq_puts(s, ",noperm");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
590 seq_printf(s, ",backupuid=%u",
591 from_kuid_munged(&init_user_ns,
592 cifs_sb->mnt_backupuid));
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
594 seq_printf(s, ",backupgid=%u",
595 from_kgid_munged(&init_user_ns,
596 cifs_sb->mnt_backupgid));
597
598 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
599 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
600 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
601 if (tcon->ses->server->min_offload)
602 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
603 seq_printf(s, ",echo_interval=%lu",
604 tcon->ses->server->echo_interval / HZ);
605
606 /* Only display max_credits if it was overridden on mount */
607 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
608 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
609
610 if (tcon->snapshot_time)
611 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
612 if (tcon->handle_timeout)
613 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
614 /* convert actimeo and display it in seconds */
615 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
616
617 return 0;
618 }
619
cifs_umount_begin(struct super_block * sb)620 static void cifs_umount_begin(struct super_block *sb)
621 {
622 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
623 struct cifs_tcon *tcon;
624
625 if (cifs_sb == NULL)
626 return;
627
628 tcon = cifs_sb_master_tcon(cifs_sb);
629
630 spin_lock(&cifs_tcp_ses_lock);
631 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
632 /* we have other mounts to same share or we have
633 already tried to force umount this and woken up
634 all waiting network requests, nothing to do */
635 spin_unlock(&cifs_tcp_ses_lock);
636 return;
637 } else if (tcon->tc_count == 1)
638 tcon->tidStatus = CifsExiting;
639 spin_unlock(&cifs_tcp_ses_lock);
640
641 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
642 /* cancel_notify_requests(tcon); */
643 if (tcon->ses && tcon->ses->server) {
644 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
645 wake_up_all(&tcon->ses->server->request_q);
646 wake_up_all(&tcon->ses->server->response_q);
647 msleep(1); /* yield */
648 /* we have to kick the requests once more */
649 wake_up_all(&tcon->ses->server->response_q);
650 msleep(1);
651 }
652
653 return;
654 }
655
656 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)657 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
658 {
659 /* BB FIXME */
660 return 0;
661 }
662 #endif
663
cifs_remount(struct super_block * sb,int * flags,char * data)664 static int cifs_remount(struct super_block *sb, int *flags, char *data)
665 {
666 sync_filesystem(sb);
667 *flags |= SB_NODIRATIME;
668 return 0;
669 }
670
cifs_drop_inode(struct inode * inode)671 static int cifs_drop_inode(struct inode *inode)
672 {
673 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
674
675 /* no serverino => unconditional eviction */
676 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
677 generic_drop_inode(inode);
678 }
679
680 static const struct super_operations cifs_super_ops = {
681 .statfs = cifs_statfs,
682 .alloc_inode = cifs_alloc_inode,
683 .free_inode = cifs_free_inode,
684 .drop_inode = cifs_drop_inode,
685 .evict_inode = cifs_evict_inode,
686 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
687 function unless later we add lazy close of inodes or unless the
688 kernel forgets to call us with the same number of releases (closes)
689 as opens */
690 .show_options = cifs_show_options,
691 .umount_begin = cifs_umount_begin,
692 .remount_fs = cifs_remount,
693 #ifdef CONFIG_CIFS_STATS2
694 .show_stats = cifs_show_stats,
695 #endif
696 };
697
698 /*
699 * Get root dentry from superblock according to prefix path mount option.
700 * Return dentry with refcount + 1 on success and NULL otherwise.
701 */
702 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)703 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
704 {
705 struct dentry *dentry;
706 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
707 char *full_path = NULL;
708 char *s, *p;
709 char sep;
710
711 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
712 return dget(sb->s_root);
713
714 full_path = cifs_build_path_to_root(vol, cifs_sb,
715 cifs_sb_master_tcon(cifs_sb), 0);
716 if (full_path == NULL)
717 return ERR_PTR(-ENOMEM);
718
719 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
720
721 sep = CIFS_DIR_SEP(cifs_sb);
722 dentry = dget(sb->s_root);
723 p = s = full_path;
724
725 do {
726 struct inode *dir = d_inode(dentry);
727 struct dentry *child;
728
729 if (!dir) {
730 dput(dentry);
731 dentry = ERR_PTR(-ENOENT);
732 break;
733 }
734 if (!S_ISDIR(dir->i_mode)) {
735 dput(dentry);
736 dentry = ERR_PTR(-ENOTDIR);
737 break;
738 }
739
740 /* skip separators */
741 while (*s == sep)
742 s++;
743 if (!*s)
744 break;
745 p = s++;
746 /* next separator */
747 while (*s && *s != sep)
748 s++;
749
750 child = lookup_one_len_unlocked(p, dentry, s - p);
751 dput(dentry);
752 dentry = child;
753 } while (!IS_ERR(dentry));
754 kfree(full_path);
755 return dentry;
756 }
757
cifs_set_super(struct super_block * sb,void * data)758 static int cifs_set_super(struct super_block *sb, void *data)
759 {
760 struct cifs_mnt_data *mnt_data = data;
761 sb->s_fs_info = mnt_data->cifs_sb;
762 return set_anon_super(sb, NULL);
763 }
764
765 static struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,bool is_smb3)766 cifs_smb3_do_mount(struct file_system_type *fs_type,
767 int flags, const char *dev_name, void *data, bool is_smb3)
768 {
769 int rc;
770 struct super_block *sb;
771 struct cifs_sb_info *cifs_sb;
772 struct smb_vol *volume_info;
773 struct cifs_mnt_data mnt_data;
774 struct dentry *root;
775
776 /*
777 * Prints in Kernel / CIFS log the attempted mount operation
778 * If CIFS_DEBUG && cifs_FYI
779 */
780 if (cifsFYI)
781 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
782 else
783 cifs_info("Attempting to mount %s\n", dev_name);
784
785 volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
786 if (IS_ERR(volume_info))
787 return ERR_CAST(volume_info);
788
789 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
790 if (cifs_sb == NULL) {
791 root = ERR_PTR(-ENOMEM);
792 goto out_nls;
793 }
794
795 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
796 if (cifs_sb->mountdata == NULL) {
797 root = ERR_PTR(-ENOMEM);
798 goto out_free;
799 }
800
801 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
802 if (rc) {
803 root = ERR_PTR(rc);
804 goto out_free;
805 }
806
807 rc = cifs_mount(cifs_sb, volume_info);
808 if (rc) {
809 if (!(flags & SB_SILENT))
810 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
811 rc);
812 root = ERR_PTR(rc);
813 goto out_free;
814 }
815
816 mnt_data.vol = volume_info;
817 mnt_data.cifs_sb = cifs_sb;
818 mnt_data.flags = flags;
819
820 /* BB should we make this contingent on mount parm? */
821 flags |= SB_NODIRATIME | SB_NOATIME;
822
823 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
824 if (IS_ERR(sb)) {
825 root = ERR_CAST(sb);
826 cifs_umount(cifs_sb);
827 goto out;
828 }
829
830 if (sb->s_root) {
831 cifs_dbg(FYI, "Use existing superblock\n");
832 cifs_umount(cifs_sb);
833 } else {
834 rc = cifs_read_super(sb);
835 if (rc) {
836 root = ERR_PTR(rc);
837 goto out_super;
838 }
839
840 sb->s_flags |= SB_ACTIVE;
841 }
842
843 root = cifs_get_root(volume_info, sb);
844 if (IS_ERR(root))
845 goto out_super;
846
847 cifs_dbg(FYI, "dentry root is: %p\n", root);
848 goto out;
849
850 out_super:
851 deactivate_locked_super(sb);
852 out:
853 cifs_cleanup_volume_info(volume_info);
854 return root;
855
856 out_free:
857 kfree(cifs_sb->prepath);
858 kfree(cifs_sb->mountdata);
859 kfree(cifs_sb);
860 out_nls:
861 unload_nls(volume_info->local_nls);
862 goto out;
863 }
864
865 static struct dentry *
smb3_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)866 smb3_do_mount(struct file_system_type *fs_type,
867 int flags, const char *dev_name, void *data)
868 {
869 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, true);
870 }
871
872 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)873 cifs_do_mount(struct file_system_type *fs_type,
874 int flags, const char *dev_name, void *data)
875 {
876 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, false);
877 }
878
879 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)880 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
881 {
882 ssize_t rc;
883 struct inode *inode = file_inode(iocb->ki_filp);
884
885 if (iocb->ki_filp->f_flags & O_DIRECT)
886 return cifs_user_readv(iocb, iter);
887
888 rc = cifs_revalidate_mapping(inode);
889 if (rc)
890 return rc;
891
892 return generic_file_read_iter(iocb, iter);
893 }
894
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)895 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
896 {
897 struct inode *inode = file_inode(iocb->ki_filp);
898 struct cifsInodeInfo *cinode = CIFS_I(inode);
899 ssize_t written;
900 int rc;
901
902 if (iocb->ki_filp->f_flags & O_DIRECT) {
903 written = cifs_user_writev(iocb, from);
904 if (written > 0 && CIFS_CACHE_READ(cinode)) {
905 cifs_zap_mapping(inode);
906 cifs_dbg(FYI,
907 "Set no oplock for inode=%p after a write operation\n",
908 inode);
909 cinode->oplock = 0;
910 }
911 return written;
912 }
913
914 written = cifs_get_writer(cinode);
915 if (written)
916 return written;
917
918 written = generic_file_write_iter(iocb, from);
919
920 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
921 goto out;
922
923 rc = filemap_fdatawrite(inode->i_mapping);
924 if (rc)
925 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
926 rc, inode);
927
928 out:
929 cifs_put_writer(cinode);
930 return written;
931 }
932
cifs_llseek(struct file * file,loff_t offset,int whence)933 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
934 {
935 struct cifsFileInfo *cfile = file->private_data;
936 struct cifs_tcon *tcon;
937
938 /*
939 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
940 * the cached file length
941 */
942 if (whence != SEEK_SET && whence != SEEK_CUR) {
943 int rc;
944 struct inode *inode = file_inode(file);
945
946 /*
947 * We need to be sure that all dirty pages are written and the
948 * server has the newest file length.
949 */
950 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
951 inode->i_mapping->nrpages != 0) {
952 rc = filemap_fdatawait(inode->i_mapping);
953 if (rc) {
954 mapping_set_error(inode->i_mapping, rc);
955 return rc;
956 }
957 }
958 /*
959 * Some applications poll for the file length in this strange
960 * way so we must seek to end on non-oplocked files by
961 * setting the revalidate time to zero.
962 */
963 CIFS_I(inode)->time = 0;
964
965 rc = cifs_revalidate_file_attr(file);
966 if (rc < 0)
967 return (loff_t)rc;
968 }
969 if (cfile && cfile->tlink) {
970 tcon = tlink_tcon(cfile->tlink);
971 if (tcon->ses->server->ops->llseek)
972 return tcon->ses->server->ops->llseek(file, tcon,
973 offset, whence);
974 }
975 return generic_file_llseek(file, offset, whence);
976 }
977
978 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)979 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
980 {
981 /*
982 * Note that this is called by vfs setlease with i_lock held to
983 * protect *lease from going away.
984 */
985 struct inode *inode = file_inode(file);
986 struct cifsFileInfo *cfile = file->private_data;
987
988 if (!(S_ISREG(inode->i_mode)))
989 return -EINVAL;
990
991 /* Check if file is oplocked if this is request for new lease */
992 if (arg == F_UNLCK ||
993 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
994 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
995 return generic_setlease(file, arg, lease, priv);
996 else if (tlink_tcon(cfile->tlink)->local_lease &&
997 !CIFS_CACHE_READ(CIFS_I(inode)))
998 /*
999 * If the server claims to support oplock on this file, then we
1000 * still need to check oplock even if the local_lease mount
1001 * option is set, but there are servers which do not support
1002 * oplock for which this mount option may be useful if the user
1003 * knows that the file won't be changed on the server by anyone
1004 * else.
1005 */
1006 return generic_setlease(file, arg, lease, priv);
1007 else
1008 return -EAGAIN;
1009 }
1010
1011 struct file_system_type cifs_fs_type = {
1012 .owner = THIS_MODULE,
1013 .name = "cifs",
1014 .mount = cifs_do_mount,
1015 .kill_sb = cifs_kill_sb,
1016 /* .fs_flags */
1017 };
1018 MODULE_ALIAS_FS("cifs");
1019
1020 static struct file_system_type smb3_fs_type = {
1021 .owner = THIS_MODULE,
1022 .name = "smb3",
1023 .mount = smb3_do_mount,
1024 .kill_sb = cifs_kill_sb,
1025 /* .fs_flags */
1026 };
1027 MODULE_ALIAS_FS("smb3");
1028 MODULE_ALIAS("smb3");
1029
1030 const struct inode_operations cifs_dir_inode_ops = {
1031 .create = cifs_create,
1032 .atomic_open = cifs_atomic_open,
1033 .lookup = cifs_lookup,
1034 .getattr = cifs_getattr,
1035 .unlink = cifs_unlink,
1036 .link = cifs_hardlink,
1037 .mkdir = cifs_mkdir,
1038 .rmdir = cifs_rmdir,
1039 .rename = cifs_rename2,
1040 .permission = cifs_permission,
1041 .setattr = cifs_setattr,
1042 .symlink = cifs_symlink,
1043 .mknod = cifs_mknod,
1044 .listxattr = cifs_listxattr,
1045 };
1046
1047 const struct inode_operations cifs_file_inode_ops = {
1048 .setattr = cifs_setattr,
1049 .getattr = cifs_getattr,
1050 .permission = cifs_permission,
1051 .listxattr = cifs_listxattr,
1052 .fiemap = cifs_fiemap,
1053 };
1054
1055 const struct inode_operations cifs_symlink_inode_ops = {
1056 .get_link = cifs_get_link,
1057 .permission = cifs_permission,
1058 .listxattr = cifs_listxattr,
1059 };
1060
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)1061 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1062 struct file *dst_file, loff_t destoff, loff_t len,
1063 unsigned int remap_flags)
1064 {
1065 struct inode *src_inode = file_inode(src_file);
1066 struct inode *target_inode = file_inode(dst_file);
1067 struct cifsFileInfo *smb_file_src = src_file->private_data;
1068 struct cifsFileInfo *smb_file_target;
1069 struct cifs_tcon *target_tcon;
1070 unsigned int xid;
1071 int rc;
1072
1073 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1074 return -EINVAL;
1075
1076 cifs_dbg(FYI, "clone range\n");
1077
1078 xid = get_xid();
1079
1080 if (!src_file->private_data || !dst_file->private_data) {
1081 rc = -EBADF;
1082 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1083 goto out;
1084 }
1085
1086 smb_file_target = dst_file->private_data;
1087 target_tcon = tlink_tcon(smb_file_target->tlink);
1088
1089 /*
1090 * Note: cifs case is easier than btrfs since server responsible for
1091 * checks for proper open modes and file type and if it wants
1092 * server could even support copy of range where source = target
1093 */
1094 lock_two_nondirectories(target_inode, src_inode);
1095
1096 if (len == 0)
1097 len = src_inode->i_size - off;
1098
1099 cifs_dbg(FYI, "about to flush pages\n");
1100 /* should we flush first and last page first */
1101 truncate_inode_pages_range(&target_inode->i_data, destoff,
1102 PAGE_ALIGN(destoff + len)-1);
1103
1104 if (target_tcon->ses->server->ops->duplicate_extents)
1105 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1106 smb_file_src, smb_file_target, off, len, destoff);
1107 else
1108 rc = -EOPNOTSUPP;
1109
1110 /* force revalidate of size and timestamps of target file now
1111 that target is updated on the server */
1112 CIFS_I(target_inode)->time = 0;
1113 /* although unlocking in the reverse order from locking is not
1114 strictly necessary here it is a little cleaner to be consistent */
1115 unlock_two_nondirectories(src_inode, target_inode);
1116 out:
1117 free_xid(xid);
1118 return rc < 0 ? rc : len;
1119 }
1120
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)1121 ssize_t cifs_file_copychunk_range(unsigned int xid,
1122 struct file *src_file, loff_t off,
1123 struct file *dst_file, loff_t destoff,
1124 size_t len, unsigned int flags)
1125 {
1126 struct inode *src_inode = file_inode(src_file);
1127 struct inode *target_inode = file_inode(dst_file);
1128 struct cifsFileInfo *smb_file_src;
1129 struct cifsFileInfo *smb_file_target;
1130 struct cifs_tcon *src_tcon;
1131 struct cifs_tcon *target_tcon;
1132 ssize_t rc;
1133
1134 cifs_dbg(FYI, "copychunk range\n");
1135
1136 if (!src_file->private_data || !dst_file->private_data) {
1137 rc = -EBADF;
1138 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1139 goto out;
1140 }
1141
1142 rc = -EXDEV;
1143 smb_file_target = dst_file->private_data;
1144 smb_file_src = src_file->private_data;
1145 src_tcon = tlink_tcon(smb_file_src->tlink);
1146 target_tcon = tlink_tcon(smb_file_target->tlink);
1147
1148 if (src_tcon->ses != target_tcon->ses) {
1149 cifs_dbg(VFS, "source and target of copy not on same server\n");
1150 goto out;
1151 }
1152
1153 rc = -EOPNOTSUPP;
1154 if (!target_tcon->ses->server->ops->copychunk_range)
1155 goto out;
1156
1157 /*
1158 * Note: cifs case is easier than btrfs since server responsible for
1159 * checks for proper open modes and file type and if it wants
1160 * server could even support copy of range where source = target
1161 */
1162 lock_two_nondirectories(target_inode, src_inode);
1163
1164 cifs_dbg(FYI, "about to flush pages\n");
1165 /* should we flush first and last page first */
1166 truncate_inode_pages(&target_inode->i_data, 0);
1167
1168 rc = file_modified(dst_file);
1169 if (!rc)
1170 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1171 smb_file_src, smb_file_target, off, len, destoff);
1172
1173 file_accessed(src_file);
1174
1175 /* force revalidate of size and timestamps of target file now
1176 * that target is updated on the server
1177 */
1178 CIFS_I(target_inode)->time = 0;
1179 /* although unlocking in the reverse order from locking is not
1180 * strictly necessary here it is a little cleaner to be consistent
1181 */
1182 unlock_two_nondirectories(src_inode, target_inode);
1183
1184 out:
1185 return rc;
1186 }
1187
1188 /*
1189 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1190 * is a dummy operation.
1191 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1192 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1193 {
1194 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1195 file, datasync);
1196
1197 return 0;
1198 }
1199
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1200 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1201 struct file *dst_file, loff_t destoff,
1202 size_t len, unsigned int flags)
1203 {
1204 unsigned int xid = get_xid();
1205 ssize_t rc;
1206
1207 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1208 len, flags);
1209 free_xid(xid);
1210
1211 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1212 rc = generic_copy_file_range(src_file, off, dst_file,
1213 destoff, len, flags);
1214 return rc;
1215 }
1216
1217 const struct file_operations cifs_file_ops = {
1218 .read_iter = cifs_loose_read_iter,
1219 .write_iter = cifs_file_write_iter,
1220 .open = cifs_open,
1221 .release = cifs_close,
1222 .lock = cifs_lock,
1223 .fsync = cifs_fsync,
1224 .flush = cifs_flush,
1225 .mmap = cifs_file_mmap,
1226 .splice_read = generic_file_splice_read,
1227 .splice_write = iter_file_splice_write,
1228 .llseek = cifs_llseek,
1229 .unlocked_ioctl = cifs_ioctl,
1230 .copy_file_range = cifs_copy_file_range,
1231 .remap_file_range = cifs_remap_file_range,
1232 .setlease = cifs_setlease,
1233 .fallocate = cifs_fallocate,
1234 };
1235
1236 const struct file_operations cifs_file_strict_ops = {
1237 .read_iter = cifs_strict_readv,
1238 .write_iter = cifs_strict_writev,
1239 .open = cifs_open,
1240 .release = cifs_close,
1241 .lock = cifs_lock,
1242 .fsync = cifs_strict_fsync,
1243 .flush = cifs_flush,
1244 .mmap = cifs_file_strict_mmap,
1245 .splice_read = generic_file_splice_read,
1246 .splice_write = iter_file_splice_write,
1247 .llseek = cifs_llseek,
1248 .unlocked_ioctl = cifs_ioctl,
1249 .copy_file_range = cifs_copy_file_range,
1250 .remap_file_range = cifs_remap_file_range,
1251 .setlease = cifs_setlease,
1252 .fallocate = cifs_fallocate,
1253 };
1254
1255 const struct file_operations cifs_file_direct_ops = {
1256 .read_iter = cifs_direct_readv,
1257 .write_iter = cifs_direct_writev,
1258 .open = cifs_open,
1259 .release = cifs_close,
1260 .lock = cifs_lock,
1261 .fsync = cifs_fsync,
1262 .flush = cifs_flush,
1263 .mmap = cifs_file_mmap,
1264 .splice_read = generic_file_splice_read,
1265 .splice_write = iter_file_splice_write,
1266 .unlocked_ioctl = cifs_ioctl,
1267 .copy_file_range = cifs_copy_file_range,
1268 .remap_file_range = cifs_remap_file_range,
1269 .llseek = cifs_llseek,
1270 .setlease = cifs_setlease,
1271 .fallocate = cifs_fallocate,
1272 };
1273
1274 const struct file_operations cifs_file_nobrl_ops = {
1275 .read_iter = cifs_loose_read_iter,
1276 .write_iter = cifs_file_write_iter,
1277 .open = cifs_open,
1278 .release = cifs_close,
1279 .fsync = cifs_fsync,
1280 .flush = cifs_flush,
1281 .mmap = cifs_file_mmap,
1282 .splice_read = generic_file_splice_read,
1283 .splice_write = iter_file_splice_write,
1284 .llseek = cifs_llseek,
1285 .unlocked_ioctl = cifs_ioctl,
1286 .copy_file_range = cifs_copy_file_range,
1287 .remap_file_range = cifs_remap_file_range,
1288 .setlease = cifs_setlease,
1289 .fallocate = cifs_fallocate,
1290 };
1291
1292 const struct file_operations cifs_file_strict_nobrl_ops = {
1293 .read_iter = cifs_strict_readv,
1294 .write_iter = cifs_strict_writev,
1295 .open = cifs_open,
1296 .release = cifs_close,
1297 .fsync = cifs_strict_fsync,
1298 .flush = cifs_flush,
1299 .mmap = cifs_file_strict_mmap,
1300 .splice_read = generic_file_splice_read,
1301 .splice_write = iter_file_splice_write,
1302 .llseek = cifs_llseek,
1303 .unlocked_ioctl = cifs_ioctl,
1304 .copy_file_range = cifs_copy_file_range,
1305 .remap_file_range = cifs_remap_file_range,
1306 .setlease = cifs_setlease,
1307 .fallocate = cifs_fallocate,
1308 };
1309
1310 const struct file_operations cifs_file_direct_nobrl_ops = {
1311 .read_iter = cifs_direct_readv,
1312 .write_iter = cifs_direct_writev,
1313 .open = cifs_open,
1314 .release = cifs_close,
1315 .fsync = cifs_fsync,
1316 .flush = cifs_flush,
1317 .mmap = cifs_file_mmap,
1318 .splice_read = generic_file_splice_read,
1319 .splice_write = iter_file_splice_write,
1320 .unlocked_ioctl = cifs_ioctl,
1321 .copy_file_range = cifs_copy_file_range,
1322 .remap_file_range = cifs_remap_file_range,
1323 .llseek = cifs_llseek,
1324 .setlease = cifs_setlease,
1325 .fallocate = cifs_fallocate,
1326 };
1327
1328 const struct file_operations cifs_dir_ops = {
1329 .iterate_shared = cifs_readdir,
1330 .release = cifs_closedir,
1331 .read = generic_read_dir,
1332 .unlocked_ioctl = cifs_ioctl,
1333 .copy_file_range = cifs_copy_file_range,
1334 .remap_file_range = cifs_remap_file_range,
1335 .llseek = generic_file_llseek,
1336 .fsync = cifs_dir_fsync,
1337 };
1338
1339 static void
cifs_init_once(void * inode)1340 cifs_init_once(void *inode)
1341 {
1342 struct cifsInodeInfo *cifsi = inode;
1343
1344 inode_init_once(&cifsi->vfs_inode);
1345 init_rwsem(&cifsi->lock_sem);
1346 }
1347
1348 static int __init
cifs_init_inodecache(void)1349 cifs_init_inodecache(void)
1350 {
1351 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1352 sizeof(struct cifsInodeInfo),
1353 0, (SLAB_RECLAIM_ACCOUNT|
1354 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1355 cifs_init_once);
1356 if (cifs_inode_cachep == NULL)
1357 return -ENOMEM;
1358
1359 return 0;
1360 }
1361
1362 static void
cifs_destroy_inodecache(void)1363 cifs_destroy_inodecache(void)
1364 {
1365 /*
1366 * Make sure all delayed rcu free inodes are flushed before we
1367 * destroy cache.
1368 */
1369 rcu_barrier();
1370 kmem_cache_destroy(cifs_inode_cachep);
1371 }
1372
1373 static int
cifs_init_request_bufs(void)1374 cifs_init_request_bufs(void)
1375 {
1376 /*
1377 * SMB2 maximum header size is bigger than CIFS one - no problems to
1378 * allocate some more bytes for CIFS.
1379 */
1380 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1381
1382 if (CIFSMaxBufSize < 8192) {
1383 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1384 Unicode path name has to fit in any SMB/CIFS path based frames */
1385 CIFSMaxBufSize = 8192;
1386 } else if (CIFSMaxBufSize > 1024*127) {
1387 CIFSMaxBufSize = 1024 * 127;
1388 } else {
1389 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1390 }
1391 /*
1392 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1393 CIFSMaxBufSize, CIFSMaxBufSize);
1394 */
1395 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1396 CIFSMaxBufSize + max_hdr_size, 0,
1397 SLAB_HWCACHE_ALIGN, 0,
1398 CIFSMaxBufSize + max_hdr_size,
1399 NULL);
1400 if (cifs_req_cachep == NULL)
1401 return -ENOMEM;
1402
1403 if (cifs_min_rcv < 1)
1404 cifs_min_rcv = 1;
1405 else if (cifs_min_rcv > 64) {
1406 cifs_min_rcv = 64;
1407 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1408 }
1409
1410 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1411 cifs_req_cachep);
1412
1413 if (cifs_req_poolp == NULL) {
1414 kmem_cache_destroy(cifs_req_cachep);
1415 return -ENOMEM;
1416 }
1417 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1418 almost all handle based requests (but not write response, nor is it
1419 sufficient for path based requests). A smaller size would have
1420 been more efficient (compacting multiple slab items on one 4k page)
1421 for the case in which debug was on, but this larger size allows
1422 more SMBs to use small buffer alloc and is still much more
1423 efficient to alloc 1 per page off the slab compared to 17K (5page)
1424 alloc of large cifs buffers even when page debugging is on */
1425 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1426 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1427 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1428 if (cifs_sm_req_cachep == NULL) {
1429 mempool_destroy(cifs_req_poolp);
1430 kmem_cache_destroy(cifs_req_cachep);
1431 return -ENOMEM;
1432 }
1433
1434 if (cifs_min_small < 2)
1435 cifs_min_small = 2;
1436 else if (cifs_min_small > 256) {
1437 cifs_min_small = 256;
1438 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1439 }
1440
1441 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1442 cifs_sm_req_cachep);
1443
1444 if (cifs_sm_req_poolp == NULL) {
1445 mempool_destroy(cifs_req_poolp);
1446 kmem_cache_destroy(cifs_req_cachep);
1447 kmem_cache_destroy(cifs_sm_req_cachep);
1448 return -ENOMEM;
1449 }
1450
1451 return 0;
1452 }
1453
1454 static void
cifs_destroy_request_bufs(void)1455 cifs_destroy_request_bufs(void)
1456 {
1457 mempool_destroy(cifs_req_poolp);
1458 kmem_cache_destroy(cifs_req_cachep);
1459 mempool_destroy(cifs_sm_req_poolp);
1460 kmem_cache_destroy(cifs_sm_req_cachep);
1461 }
1462
1463 static int
cifs_init_mids(void)1464 cifs_init_mids(void)
1465 {
1466 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1467 sizeof(struct mid_q_entry), 0,
1468 SLAB_HWCACHE_ALIGN, NULL);
1469 if (cifs_mid_cachep == NULL)
1470 return -ENOMEM;
1471
1472 /* 3 is a reasonable minimum number of simultaneous operations */
1473 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1474 if (cifs_mid_poolp == NULL) {
1475 kmem_cache_destroy(cifs_mid_cachep);
1476 return -ENOMEM;
1477 }
1478
1479 return 0;
1480 }
1481
1482 static void
cifs_destroy_mids(void)1483 cifs_destroy_mids(void)
1484 {
1485 mempool_destroy(cifs_mid_poolp);
1486 kmem_cache_destroy(cifs_mid_cachep);
1487 }
1488
1489 static int __init
init_cifs(void)1490 init_cifs(void)
1491 {
1492 int rc = 0;
1493 cifs_proc_init();
1494 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1495 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1496 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1497 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1498 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1499 /*
1500 * Initialize Global counters
1501 */
1502 atomic_set(&sesInfoAllocCount, 0);
1503 atomic_set(&tconInfoAllocCount, 0);
1504 atomic_set(&tcpSesAllocCount, 0);
1505 atomic_set(&tcpSesReconnectCount, 0);
1506 atomic_set(&tconInfoReconnectCount, 0);
1507
1508 atomic_set(&bufAllocCount, 0);
1509 atomic_set(&smBufAllocCount, 0);
1510 #ifdef CONFIG_CIFS_STATS2
1511 atomic_set(&totBufAllocCount, 0);
1512 atomic_set(&totSmBufAllocCount, 0);
1513 if (slow_rsp_threshold < 1)
1514 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1515 else if (slow_rsp_threshold > 32767)
1516 cifs_dbg(VFS,
1517 "slow response threshold set higher than recommended (0 to 32767)\n");
1518 #endif /* CONFIG_CIFS_STATS2 */
1519
1520 atomic_set(&midCount, 0);
1521 GlobalCurrentXid = 0;
1522 GlobalTotalActiveXid = 0;
1523 GlobalMaxActiveXid = 0;
1524 spin_lock_init(&cifs_tcp_ses_lock);
1525 spin_lock_init(&GlobalMid_Lock);
1526
1527 cifs_lock_secret = get_random_u32();
1528
1529 if (cifs_max_pending < 2) {
1530 cifs_max_pending = 2;
1531 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1532 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1533 cifs_max_pending = CIFS_MAX_REQ;
1534 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1535 CIFS_MAX_REQ);
1536 }
1537
1538 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1539 if (!cifsiod_wq) {
1540 rc = -ENOMEM;
1541 goto out_clean_proc;
1542 }
1543
1544 /*
1545 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1546 * so that we don't launch too many worker threads but
1547 * Documentation/workqueue.txt recommends setting it to 0
1548 */
1549
1550 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1551 decrypt_wq = alloc_workqueue("smb3decryptd",
1552 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1553 if (!decrypt_wq) {
1554 rc = -ENOMEM;
1555 goto out_destroy_cifsiod_wq;
1556 }
1557
1558 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1559 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1560 if (!fileinfo_put_wq) {
1561 rc = -ENOMEM;
1562 goto out_destroy_decrypt_wq;
1563 }
1564
1565 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1566 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1567 if (!cifsoplockd_wq) {
1568 rc = -ENOMEM;
1569 goto out_destroy_fileinfo_put_wq;
1570 }
1571
1572 rc = cifs_fscache_register();
1573 if (rc)
1574 goto out_destroy_cifsoplockd_wq;
1575
1576 rc = cifs_init_inodecache();
1577 if (rc)
1578 goto out_unreg_fscache;
1579
1580 rc = cifs_init_mids();
1581 if (rc)
1582 goto out_destroy_inodecache;
1583
1584 rc = cifs_init_request_bufs();
1585 if (rc)
1586 goto out_destroy_mids;
1587
1588 #ifdef CONFIG_CIFS_DFS_UPCALL
1589 rc = dfs_cache_init();
1590 if (rc)
1591 goto out_destroy_request_bufs;
1592 #endif /* CONFIG_CIFS_DFS_UPCALL */
1593 #ifdef CONFIG_CIFS_UPCALL
1594 rc = init_cifs_spnego();
1595 if (rc)
1596 goto out_destroy_dfs_cache;
1597 #endif /* CONFIG_CIFS_UPCALL */
1598
1599 rc = init_cifs_idmap();
1600 if (rc)
1601 goto out_register_key_type;
1602
1603 rc = register_filesystem(&cifs_fs_type);
1604 if (rc)
1605 goto out_init_cifs_idmap;
1606
1607 rc = register_filesystem(&smb3_fs_type);
1608 if (rc) {
1609 unregister_filesystem(&cifs_fs_type);
1610 goto out_init_cifs_idmap;
1611 }
1612
1613 return 0;
1614
1615 out_init_cifs_idmap:
1616 exit_cifs_idmap();
1617 out_register_key_type:
1618 #ifdef CONFIG_CIFS_UPCALL
1619 exit_cifs_spnego();
1620 out_destroy_dfs_cache:
1621 #endif
1622 #ifdef CONFIG_CIFS_DFS_UPCALL
1623 dfs_cache_destroy();
1624 out_destroy_request_bufs:
1625 #endif
1626 cifs_destroy_request_bufs();
1627 out_destroy_mids:
1628 cifs_destroy_mids();
1629 out_destroy_inodecache:
1630 cifs_destroy_inodecache();
1631 out_unreg_fscache:
1632 cifs_fscache_unregister();
1633 out_destroy_cifsoplockd_wq:
1634 destroy_workqueue(cifsoplockd_wq);
1635 out_destroy_fileinfo_put_wq:
1636 destroy_workqueue(fileinfo_put_wq);
1637 out_destroy_decrypt_wq:
1638 destroy_workqueue(decrypt_wq);
1639 out_destroy_cifsiod_wq:
1640 destroy_workqueue(cifsiod_wq);
1641 out_clean_proc:
1642 cifs_proc_clean();
1643 return rc;
1644 }
1645
1646 static void __exit
exit_cifs(void)1647 exit_cifs(void)
1648 {
1649 cifs_dbg(NOISY, "exit_smb3\n");
1650 unregister_filesystem(&cifs_fs_type);
1651 unregister_filesystem(&smb3_fs_type);
1652 cifs_dfs_release_automount_timer();
1653 exit_cifs_idmap();
1654 #ifdef CONFIG_CIFS_UPCALL
1655 exit_cifs_spnego();
1656 #endif
1657 #ifdef CONFIG_CIFS_DFS_UPCALL
1658 dfs_cache_destroy();
1659 #endif
1660 cifs_destroy_request_bufs();
1661 cifs_destroy_mids();
1662 cifs_destroy_inodecache();
1663 cifs_fscache_unregister();
1664 destroy_workqueue(cifsoplockd_wq);
1665 destroy_workqueue(decrypt_wq);
1666 destroy_workqueue(fileinfo_put_wq);
1667 destroy_workqueue(cifsiod_wq);
1668 cifs_proc_clean();
1669 }
1670
1671 MODULE_AUTHOR("Steve French");
1672 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1673 MODULE_DESCRIPTION
1674 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1675 "also older servers complying with the SNIA CIFS Specification)");
1676 MODULE_VERSION(CIFS_VERSION);
1677 MODULE_SOFTDEP("pre: ecb");
1678 MODULE_SOFTDEP("pre: hmac");
1679 MODULE_SOFTDEP("pre: md4");
1680 MODULE_SOFTDEP("pre: md5");
1681 MODULE_SOFTDEP("pre: nls");
1682 MODULE_SOFTDEP("pre: aes");
1683 MODULE_SOFTDEP("pre: cmac");
1684 MODULE_SOFTDEP("pre: sha256");
1685 MODULE_SOFTDEP("pre: sha512");
1686 MODULE_SOFTDEP("pre: aead2");
1687 MODULE_SOFTDEP("pre: ccm");
1688 MODULE_SOFTDEP("pre: gcm");
1689 module_init(init_cifs)
1690 module_exit(exit_cifs)
1691