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1/*
2 * fs/cifs/cifsfs.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24/* Note that BB means BUGBUG (ie something to fix eventually) */
25
26#include <linux/module.h>
27#include <linux/fs.h>
28#include <linux/mount.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/list.h>
32#include <linux/seq_file.h>
33#include <linux/vfs.h>
34#include <linux/mempool.h>
35#include <linux/delay.h>
36#include <linux/kthread.h>
37#include <linux/freezer.h>
38#include <linux/namei.h>
39#include <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
68int cifsFYI = 0;
69bool traceSMB;
70bool enable_oplocks = true;
71bool linuxExtEnabled = true;
72bool lookupCacheEnabled = true;
73bool disable_legacy_dialects; /* false by default */
74unsigned int global_secflags = CIFSSEC_DEF;
75/* unsigned int ntlmv2_support = 0; */
76unsigned int sign_CIFS_PDUs = 1;
77static const struct super_operations cifs_super_ops;
78unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
79module_param(CIFSMaxBufSize, uint, 0444);
80MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
81 "for CIFS requests. "
82 "Default: 16384 Range: 8192 to 130048");
83unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
84module_param(cifs_min_rcv, uint, 0444);
85MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
86 "1 to 64");
87unsigned int cifs_min_small = 30;
88module_param(cifs_min_small, uint, 0444);
89MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
90 "Range: 2 to 256");
91unsigned int cifs_max_pending = CIFS_MAX_REQ;
92module_param(cifs_max_pending, uint, 0444);
93MODULE_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
97unsigned int slow_rsp_threshold = 1;
98module_param(slow_rsp_threshold, uint, 0644);
99MODULE_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
104module_param(enable_oplocks, bool, 0644);
105MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
106
107module_param(disable_legacy_dialects, bool, 0644);
108MODULE_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
116extern mempool_t *cifs_sm_req_poolp;
117extern mempool_t *cifs_req_poolp;
118extern mempool_t *cifs_mid_poolp;
119
120struct workqueue_struct *cifsiod_wq;
121struct workqueue_struct *decrypt_wq;
122struct workqueue_struct *fileinfo_put_wq;
123struct 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 */
132void
133cifs_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
141void
142cifs_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
150static int
151cifs_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
240out_no_root:
241 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
242 return rc;
243}
244
245static 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
252static int
253cifs_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 0;
282}
283
284static 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
296static 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
314static struct kmem_cache *cifs_inode_cachep;
315static struct kmem_cache *cifs_req_cachep;
316static struct kmem_cache *cifs_mid_cachep;
317static struct kmem_cache *cifs_sm_req_cachep;
318mempool_t *cifs_sm_req_poolp;
319mempool_t *cifs_req_poolp;
320mempool_t *cifs_mid_poolp;
321
322static struct inode *
323cifs_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
357static void
358cifs_free_inode(struct inode *inode)
359{
360 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
361}
362
363static void
364cifs_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
371static void
372cifs_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
395static void
396cifs_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
436static void
437cifs_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
453static void
454cifs_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 */
470static int
471cifs_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->nodelete)
538 seq_puts(s, ",nodelete");
539 if (tcon->local_lease)
540 seq_puts(s, ",locallease");
541 if (tcon->retry)
542 seq_puts(s, ",hard");
543 else
544 seq_puts(s, ",soft");
545 if (tcon->use_persistent)
546 seq_puts(s, ",persistenthandles");
547 else if (tcon->use_resilient)
548 seq_puts(s, ",resilienthandles");
549 if (tcon->posix_extensions)
550 seq_puts(s, ",posix");
551 else if (tcon->unix_ext)
552 seq_puts(s, ",unix");
553 else
554 seq_puts(s, ",nounix");
555 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
556 seq_puts(s, ",nodfs");
557 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
558 seq_puts(s, ",posixpaths");
559 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
560 seq_puts(s, ",setuids");
561 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
562 seq_puts(s, ",idsfromsid");
563 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
564 seq_puts(s, ",serverino");
565 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
566 seq_puts(s, ",rwpidforward");
567 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
568 seq_puts(s, ",forcemand");
569 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
570 seq_puts(s, ",nouser_xattr");
571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
572 seq_puts(s, ",mapchars");
573 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
574 seq_puts(s, ",mapposix");
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
576 seq_puts(s, ",sfu");
577 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
578 seq_puts(s, ",nobrl");
579 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
580 seq_puts(s, ",nohandlecache");
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
582 seq_puts(s, ",modefromsid");
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
584 seq_puts(s, ",cifsacl");
585 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
586 seq_puts(s, ",dynperm");
587 if (root->d_sb->s_flags & SB_POSIXACL)
588 seq_puts(s, ",acl");
589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
590 seq_puts(s, ",mfsymlinks");
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
592 seq_puts(s, ",fsc");
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
594 seq_puts(s, ",nostrictsync");
595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
596 seq_puts(s, ",noperm");
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
598 seq_printf(s, ",backupuid=%u",
599 from_kuid_munged(&init_user_ns,
600 cifs_sb->mnt_backupuid));
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
602 seq_printf(s, ",backupgid=%u",
603 from_kgid_munged(&init_user_ns,
604 cifs_sb->mnt_backupgid));
605
606 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
607 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
608 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
609 if (tcon->ses->server->min_offload)
610 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
611 seq_printf(s, ",echo_interval=%lu",
612 tcon->ses->server->echo_interval / HZ);
613
614 /* Only display max_credits if it was overridden on mount */
615 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
616 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
617
618 if (tcon->snapshot_time)
619 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
620 if (tcon->handle_timeout)
621 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
622 /* convert actimeo and display it in seconds */
623 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
624
625 if (tcon->ses->chan_max > 1)
626 seq_printf(s, ",multichannel,max_channels=%zu",
627 tcon->ses->chan_max);
628
629 return 0;
630}
631
632static 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
669static int cifs_show_stats(struct seq_file *s, struct dentry *root)
670{
671 /* BB FIXME */
672 return 0;
673}
674#endif
675
676static 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
683static 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
692static 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 */
714static struct dentry *
715cifs_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
765static 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
772static struct dentry *
773cifs_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
857out_super:
858 deactivate_locked_super(sb);
859out:
860 cifs_cleanup_volume_info(volume_info);
861 return root;
862
863out_free:
864 kfree(cifs_sb->prepath);
865 kfree(cifs_sb->mountdata);
866 kfree(cifs_sb);
867out_nls:
868 unload_nls(volume_info->local_nls);
869 goto out;
870}
871
872static struct dentry *
873smb3_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, true);
877}
878
879static struct dentry *
880cifs_do_mount(struct file_system_type *fs_type,
881 int flags, const char *dev_name, void *data)
882{
883 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, false);
884}
885
886static ssize_t
887cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
888{
889 ssize_t rc;
890 struct inode *inode = file_inode(iocb->ki_filp);
891
892 if (iocb->ki_filp->f_flags & O_DIRECT)
893 return cifs_user_readv(iocb, iter);
894
895 rc = cifs_revalidate_mapping(inode);
896 if (rc)
897 return rc;
898
899 return generic_file_read_iter(iocb, iter);
900}
901
902static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
903{
904 struct inode *inode = file_inode(iocb->ki_filp);
905 struct cifsInodeInfo *cinode = CIFS_I(inode);
906 ssize_t written;
907 int rc;
908
909 if (iocb->ki_filp->f_flags & O_DIRECT) {
910 written = cifs_user_writev(iocb, from);
911 if (written > 0 && CIFS_CACHE_READ(cinode)) {
912 cifs_zap_mapping(inode);
913 cifs_dbg(FYI,
914 "Set no oplock for inode=%p after a write operation\n",
915 inode);
916 cinode->oplock = 0;
917 }
918 return written;
919 }
920
921 written = cifs_get_writer(cinode);
922 if (written)
923 return written;
924
925 written = generic_file_write_iter(iocb, from);
926
927 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
928 goto out;
929
930 rc = filemap_fdatawrite(inode->i_mapping);
931 if (rc)
932 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
933 rc, inode);
934
935out:
936 cifs_put_writer(cinode);
937 return written;
938}
939
940static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
941{
942 struct cifsFileInfo *cfile = file->private_data;
943 struct cifs_tcon *tcon;
944
945 /*
946 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
947 * the cached file length
948 */
949 if (whence != SEEK_SET && whence != SEEK_CUR) {
950 int rc;
951 struct inode *inode = file_inode(file);
952
953 /*
954 * We need to be sure that all dirty pages are written and the
955 * server has the newest file length.
956 */
957 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
958 inode->i_mapping->nrpages != 0) {
959 rc = filemap_fdatawait(inode->i_mapping);
960 if (rc) {
961 mapping_set_error(inode->i_mapping, rc);
962 return rc;
963 }
964 }
965 /*
966 * Some applications poll for the file length in this strange
967 * way so we must seek to end on non-oplocked files by
968 * setting the revalidate time to zero.
969 */
970 CIFS_I(inode)->time = 0;
971
972 rc = cifs_revalidate_file_attr(file);
973 if (rc < 0)
974 return (loff_t)rc;
975 }
976 if (cfile && cfile->tlink) {
977 tcon = tlink_tcon(cfile->tlink);
978 if (tcon->ses->server->ops->llseek)
979 return tcon->ses->server->ops->llseek(file, tcon,
980 offset, whence);
981 }
982 return generic_file_llseek(file, offset, whence);
983}
984
985static int
986cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
987{
988 /*
989 * Note that this is called by vfs setlease with i_lock held to
990 * protect *lease from going away.
991 */
992 struct inode *inode = file_inode(file);
993 struct cifsFileInfo *cfile = file->private_data;
994
995 if (!(S_ISREG(inode->i_mode)))
996 return -EINVAL;
997
998 /* Check if file is oplocked if this is request for new lease */
999 if (arg == F_UNLCK ||
1000 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1001 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1002 return generic_setlease(file, arg, lease, priv);
1003 else if (tlink_tcon(cfile->tlink)->local_lease &&
1004 !CIFS_CACHE_READ(CIFS_I(inode)))
1005 /*
1006 * If the server claims to support oplock on this file, then we
1007 * still need to check oplock even if the local_lease mount
1008 * option is set, but there are servers which do not support
1009 * oplock for which this mount option may be useful if the user
1010 * knows that the file won't be changed on the server by anyone
1011 * else.
1012 */
1013 return generic_setlease(file, arg, lease, priv);
1014 else
1015 return -EAGAIN;
1016}
1017
1018struct file_system_type cifs_fs_type = {
1019 .owner = THIS_MODULE,
1020 .name = "cifs",
1021 .mount = cifs_do_mount,
1022 .kill_sb = cifs_kill_sb,
1023 .fs_flags = FS_RENAME_DOES_D_MOVE,
1024};
1025MODULE_ALIAS_FS("cifs");
1026
1027static struct file_system_type smb3_fs_type = {
1028 .owner = THIS_MODULE,
1029 .name = "smb3",
1030 .mount = smb3_do_mount,
1031 .kill_sb = cifs_kill_sb,
1032 .fs_flags = FS_RENAME_DOES_D_MOVE,
1033};
1034MODULE_ALIAS_FS("smb3");
1035MODULE_ALIAS("smb3");
1036
1037const struct inode_operations cifs_dir_inode_ops = {
1038 .create = cifs_create,
1039 .atomic_open = cifs_atomic_open,
1040 .lookup = cifs_lookup,
1041 .getattr = cifs_getattr,
1042 .unlink = cifs_unlink,
1043 .link = cifs_hardlink,
1044 .mkdir = cifs_mkdir,
1045 .rmdir = cifs_rmdir,
1046 .rename = cifs_rename2,
1047 .permission = cifs_permission,
1048 .setattr = cifs_setattr,
1049 .symlink = cifs_symlink,
1050 .mknod = cifs_mknod,
1051 .listxattr = cifs_listxattr,
1052};
1053
1054const struct inode_operations cifs_file_inode_ops = {
1055 .setattr = cifs_setattr,
1056 .getattr = cifs_getattr,
1057 .permission = cifs_permission,
1058 .listxattr = cifs_listxattr,
1059 .fiemap = cifs_fiemap,
1060};
1061
1062const struct inode_operations cifs_symlink_inode_ops = {
1063 .get_link = cifs_get_link,
1064 .permission = cifs_permission,
1065 .listxattr = cifs_listxattr,
1066};
1067
1068static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1069 struct file *dst_file, loff_t destoff, loff_t len,
1070 unsigned int remap_flags)
1071{
1072 struct inode *src_inode = file_inode(src_file);
1073 struct inode *target_inode = file_inode(dst_file);
1074 struct cifsFileInfo *smb_file_src = src_file->private_data;
1075 struct cifsFileInfo *smb_file_target;
1076 struct cifs_tcon *target_tcon;
1077 unsigned int xid;
1078 int rc;
1079
1080 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1081 return -EINVAL;
1082
1083 cifs_dbg(FYI, "clone range\n");
1084
1085 xid = get_xid();
1086
1087 if (!src_file->private_data || !dst_file->private_data) {
1088 rc = -EBADF;
1089 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1090 goto out;
1091 }
1092
1093 smb_file_target = dst_file->private_data;
1094 target_tcon = tlink_tcon(smb_file_target->tlink);
1095
1096 /*
1097 * Note: cifs case is easier than btrfs since server responsible for
1098 * checks for proper open modes and file type and if it wants
1099 * server could even support copy of range where source = target
1100 */
1101 lock_two_nondirectories(target_inode, src_inode);
1102
1103 if (len == 0)
1104 len = src_inode->i_size - off;
1105
1106 cifs_dbg(FYI, "about to flush pages\n");
1107 /* should we flush first and last page first */
1108 truncate_inode_pages_range(&target_inode->i_data, destoff,
1109 PAGE_ALIGN(destoff + len)-1);
1110
1111 if (target_tcon->ses->server->ops->duplicate_extents)
1112 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1113 smb_file_src, smb_file_target, off, len, destoff);
1114 else
1115 rc = -EOPNOTSUPP;
1116
1117 /* force revalidate of size and timestamps of target file now
1118 that target is updated on the server */
1119 CIFS_I(target_inode)->time = 0;
1120 /* although unlocking in the reverse order from locking is not
1121 strictly necessary here it is a little cleaner to be consistent */
1122 unlock_two_nondirectories(src_inode, target_inode);
1123out:
1124 free_xid(xid);
1125 return rc < 0 ? rc : len;
1126}
1127
1128ssize_t cifs_file_copychunk_range(unsigned int xid,
1129 struct file *src_file, loff_t off,
1130 struct file *dst_file, loff_t destoff,
1131 size_t len, unsigned int flags)
1132{
1133 struct inode *src_inode = file_inode(src_file);
1134 struct inode *target_inode = file_inode(dst_file);
1135 struct cifsFileInfo *smb_file_src;
1136 struct cifsFileInfo *smb_file_target;
1137 struct cifs_tcon *src_tcon;
1138 struct cifs_tcon *target_tcon;
1139 ssize_t rc;
1140
1141 cifs_dbg(FYI, "copychunk range\n");
1142
1143 if (!src_file->private_data || !dst_file->private_data) {
1144 rc = -EBADF;
1145 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1146 goto out;
1147 }
1148
1149 rc = -EXDEV;
1150 smb_file_target = dst_file->private_data;
1151 smb_file_src = src_file->private_data;
1152 src_tcon = tlink_tcon(smb_file_src->tlink);
1153 target_tcon = tlink_tcon(smb_file_target->tlink);
1154
1155 if (src_tcon->ses != target_tcon->ses) {
1156 cifs_dbg(VFS, "source and target of copy not on same server\n");
1157 goto out;
1158 }
1159
1160 rc = -EOPNOTSUPP;
1161 if (!target_tcon->ses->server->ops->copychunk_range)
1162 goto out;
1163
1164 /*
1165 * Note: cifs case is easier than btrfs since server responsible for
1166 * checks for proper open modes and file type and if it wants
1167 * server could even support copy of range where source = target
1168 */
1169 lock_two_nondirectories(target_inode, src_inode);
1170
1171 cifs_dbg(FYI, "about to flush pages\n");
1172 /* should we flush first and last page first */
1173 truncate_inode_pages(&target_inode->i_data, 0);
1174
1175 rc = file_modified(dst_file);
1176 if (!rc)
1177 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1178 smb_file_src, smb_file_target, off, len, destoff);
1179
1180 file_accessed(src_file);
1181
1182 /* force revalidate of size and timestamps of target file now
1183 * that target is updated on the server
1184 */
1185 CIFS_I(target_inode)->time = 0;
1186 /* although unlocking in the reverse order from locking is not
1187 * strictly necessary here it is a little cleaner to be consistent
1188 */
1189 unlock_two_nondirectories(src_inode, target_inode);
1190
1191out:
1192 return rc;
1193}
1194
1195/*
1196 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1197 * is a dummy operation.
1198 */
1199static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1200{
1201 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1202 file, datasync);
1203
1204 return 0;
1205}
1206
1207static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1208 struct file *dst_file, loff_t destoff,
1209 size_t len, unsigned int flags)
1210{
1211 unsigned int xid = get_xid();
1212 ssize_t rc;
1213 struct cifsFileInfo *cfile = dst_file->private_data;
1214
1215 if (cfile->swapfile)
1216 return -EOPNOTSUPP;
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
1228const 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 .flock = cifs_flock,
1235 .fsync = cifs_fsync,
1236 .flush = cifs_flush,
1237 .mmap = cifs_file_mmap,
1238 .splice_read = generic_file_splice_read,
1239 .splice_write = iter_file_splice_write,
1240 .llseek = cifs_llseek,
1241 .unlocked_ioctl = cifs_ioctl,
1242 .copy_file_range = cifs_copy_file_range,
1243 .remap_file_range = cifs_remap_file_range,
1244 .setlease = cifs_setlease,
1245 .fallocate = cifs_fallocate,
1246};
1247
1248const struct file_operations cifs_file_strict_ops = {
1249 .read_iter = cifs_strict_readv,
1250 .write_iter = cifs_strict_writev,
1251 .open = cifs_open,
1252 .release = cifs_close,
1253 .lock = cifs_lock,
1254 .flock = cifs_flock,
1255 .fsync = cifs_strict_fsync,
1256 .flush = cifs_flush,
1257 .mmap = cifs_file_strict_mmap,
1258 .splice_read = generic_file_splice_read,
1259 .splice_write = iter_file_splice_write,
1260 .llseek = cifs_llseek,
1261 .unlocked_ioctl = cifs_ioctl,
1262 .copy_file_range = cifs_copy_file_range,
1263 .remap_file_range = cifs_remap_file_range,
1264 .setlease = cifs_setlease,
1265 .fallocate = cifs_fallocate,
1266};
1267
1268const struct file_operations cifs_file_direct_ops = {
1269 .read_iter = cifs_direct_readv,
1270 .write_iter = cifs_direct_writev,
1271 .open = cifs_open,
1272 .release = cifs_close,
1273 .lock = cifs_lock,
1274 .flock = cifs_flock,
1275 .fsync = cifs_fsync,
1276 .flush = cifs_flush,
1277 .mmap = cifs_file_mmap,
1278 .splice_read = generic_file_splice_read,
1279 .splice_write = iter_file_splice_write,
1280 .unlocked_ioctl = cifs_ioctl,
1281 .copy_file_range = cifs_copy_file_range,
1282 .remap_file_range = cifs_remap_file_range,
1283 .llseek = cifs_llseek,
1284 .setlease = cifs_setlease,
1285 .fallocate = cifs_fallocate,
1286};
1287
1288const struct file_operations cifs_file_nobrl_ops = {
1289 .read_iter = cifs_loose_read_iter,
1290 .write_iter = cifs_file_write_iter,
1291 .open = cifs_open,
1292 .release = cifs_close,
1293 .fsync = cifs_fsync,
1294 .flush = cifs_flush,
1295 .mmap = cifs_file_mmap,
1296 .splice_read = generic_file_splice_read,
1297 .splice_write = iter_file_splice_write,
1298 .llseek = cifs_llseek,
1299 .unlocked_ioctl = cifs_ioctl,
1300 .copy_file_range = cifs_copy_file_range,
1301 .remap_file_range = cifs_remap_file_range,
1302 .setlease = cifs_setlease,
1303 .fallocate = cifs_fallocate,
1304};
1305
1306const struct file_operations cifs_file_strict_nobrl_ops = {
1307 .read_iter = cifs_strict_readv,
1308 .write_iter = cifs_strict_writev,
1309 .open = cifs_open,
1310 .release = cifs_close,
1311 .fsync = cifs_strict_fsync,
1312 .flush = cifs_flush,
1313 .mmap = cifs_file_strict_mmap,
1314 .splice_read = generic_file_splice_read,
1315 .splice_write = iter_file_splice_write,
1316 .llseek = cifs_llseek,
1317 .unlocked_ioctl = cifs_ioctl,
1318 .copy_file_range = cifs_copy_file_range,
1319 .remap_file_range = cifs_remap_file_range,
1320 .setlease = cifs_setlease,
1321 .fallocate = cifs_fallocate,
1322};
1323
1324const struct file_operations cifs_file_direct_nobrl_ops = {
1325 .read_iter = cifs_direct_readv,
1326 .write_iter = cifs_direct_writev,
1327 .open = cifs_open,
1328 .release = cifs_close,
1329 .fsync = cifs_fsync,
1330 .flush = cifs_flush,
1331 .mmap = cifs_file_mmap,
1332 .splice_read = generic_file_splice_read,
1333 .splice_write = iter_file_splice_write,
1334 .unlocked_ioctl = cifs_ioctl,
1335 .copy_file_range = cifs_copy_file_range,
1336 .remap_file_range = cifs_remap_file_range,
1337 .llseek = cifs_llseek,
1338 .setlease = cifs_setlease,
1339 .fallocate = cifs_fallocate,
1340};
1341
1342const struct file_operations cifs_dir_ops = {
1343 .iterate_shared = cifs_readdir,
1344 .release = cifs_closedir,
1345 .read = generic_read_dir,
1346 .unlocked_ioctl = cifs_ioctl,
1347 .copy_file_range = cifs_copy_file_range,
1348 .remap_file_range = cifs_remap_file_range,
1349 .llseek = generic_file_llseek,
1350 .fsync = cifs_dir_fsync,
1351};
1352
1353static void
1354cifs_init_once(void *inode)
1355{
1356 struct cifsInodeInfo *cifsi = inode;
1357
1358 inode_init_once(&cifsi->vfs_inode);
1359 init_rwsem(&cifsi->lock_sem);
1360}
1361
1362static int __init
1363cifs_init_inodecache(void)
1364{
1365 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1366 sizeof(struct cifsInodeInfo),
1367 0, (SLAB_RECLAIM_ACCOUNT|
1368 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1369 cifs_init_once);
1370 if (cifs_inode_cachep == NULL)
1371 return -ENOMEM;
1372
1373 return 0;
1374}
1375
1376static void
1377cifs_destroy_inodecache(void)
1378{
1379 /*
1380 * Make sure all delayed rcu free inodes are flushed before we
1381 * destroy cache.
1382 */
1383 rcu_barrier();
1384 kmem_cache_destroy(cifs_inode_cachep);
1385}
1386
1387static int
1388cifs_init_request_bufs(void)
1389{
1390 /*
1391 * SMB2 maximum header size is bigger than CIFS one - no problems to
1392 * allocate some more bytes for CIFS.
1393 */
1394 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1395
1396 if (CIFSMaxBufSize < 8192) {
1397 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1398 Unicode path name has to fit in any SMB/CIFS path based frames */
1399 CIFSMaxBufSize = 8192;
1400 } else if (CIFSMaxBufSize > 1024*127) {
1401 CIFSMaxBufSize = 1024 * 127;
1402 } else {
1403 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1404 }
1405/*
1406 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1407 CIFSMaxBufSize, CIFSMaxBufSize);
1408*/
1409 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1410 CIFSMaxBufSize + max_hdr_size, 0,
1411 SLAB_HWCACHE_ALIGN, 0,
1412 CIFSMaxBufSize + max_hdr_size,
1413 NULL);
1414 if (cifs_req_cachep == NULL)
1415 return -ENOMEM;
1416
1417 if (cifs_min_rcv < 1)
1418 cifs_min_rcv = 1;
1419 else if (cifs_min_rcv > 64) {
1420 cifs_min_rcv = 64;
1421 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1422 }
1423
1424 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1425 cifs_req_cachep);
1426
1427 if (cifs_req_poolp == NULL) {
1428 kmem_cache_destroy(cifs_req_cachep);
1429 return -ENOMEM;
1430 }
1431 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1432 almost all handle based requests (but not write response, nor is it
1433 sufficient for path based requests). A smaller size would have
1434 been more efficient (compacting multiple slab items on one 4k page)
1435 for the case in which debug was on, but this larger size allows
1436 more SMBs to use small buffer alloc and is still much more
1437 efficient to alloc 1 per page off the slab compared to 17K (5page)
1438 alloc of large cifs buffers even when page debugging is on */
1439 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1440 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1441 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1442 if (cifs_sm_req_cachep == NULL) {
1443 mempool_destroy(cifs_req_poolp);
1444 kmem_cache_destroy(cifs_req_cachep);
1445 return -ENOMEM;
1446 }
1447
1448 if (cifs_min_small < 2)
1449 cifs_min_small = 2;
1450 else if (cifs_min_small > 256) {
1451 cifs_min_small = 256;
1452 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1453 }
1454
1455 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1456 cifs_sm_req_cachep);
1457
1458 if (cifs_sm_req_poolp == NULL) {
1459 mempool_destroy(cifs_req_poolp);
1460 kmem_cache_destroy(cifs_req_cachep);
1461 kmem_cache_destroy(cifs_sm_req_cachep);
1462 return -ENOMEM;
1463 }
1464
1465 return 0;
1466}
1467
1468static void
1469cifs_destroy_request_bufs(void)
1470{
1471 mempool_destroy(cifs_req_poolp);
1472 kmem_cache_destroy(cifs_req_cachep);
1473 mempool_destroy(cifs_sm_req_poolp);
1474 kmem_cache_destroy(cifs_sm_req_cachep);
1475}
1476
1477static int
1478cifs_init_mids(void)
1479{
1480 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1481 sizeof(struct mid_q_entry), 0,
1482 SLAB_HWCACHE_ALIGN, NULL);
1483 if (cifs_mid_cachep == NULL)
1484 return -ENOMEM;
1485
1486 /* 3 is a reasonable minimum number of simultaneous operations */
1487 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1488 if (cifs_mid_poolp == NULL) {
1489 kmem_cache_destroy(cifs_mid_cachep);
1490 return -ENOMEM;
1491 }
1492
1493 return 0;
1494}
1495
1496static void
1497cifs_destroy_mids(void)
1498{
1499 mempool_destroy(cifs_mid_poolp);
1500 kmem_cache_destroy(cifs_mid_cachep);
1501}
1502
1503static int __init
1504init_cifs(void)
1505{
1506 int rc = 0;
1507 cifs_proc_init();
1508 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1509#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1510 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1511 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1512#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1513/*
1514 * Initialize Global counters
1515 */
1516 atomic_set(&sesInfoAllocCount, 0);
1517 atomic_set(&tconInfoAllocCount, 0);
1518 atomic_set(&tcpSesAllocCount, 0);
1519 atomic_set(&tcpSesReconnectCount, 0);
1520 atomic_set(&tconInfoReconnectCount, 0);
1521
1522 atomic_set(&bufAllocCount, 0);
1523 atomic_set(&smBufAllocCount, 0);
1524#ifdef CONFIG_CIFS_STATS2
1525 atomic_set(&totBufAllocCount, 0);
1526 atomic_set(&totSmBufAllocCount, 0);
1527 if (slow_rsp_threshold < 1)
1528 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1529 else if (slow_rsp_threshold > 32767)
1530 cifs_dbg(VFS,
1531 "slow response threshold set higher than recommended (0 to 32767)\n");
1532#endif /* CONFIG_CIFS_STATS2 */
1533
1534 atomic_set(&midCount, 0);
1535 GlobalCurrentXid = 0;
1536 GlobalTotalActiveXid = 0;
1537 GlobalMaxActiveXid = 0;
1538 spin_lock_init(&cifs_tcp_ses_lock);
1539 spin_lock_init(&GlobalMid_Lock);
1540
1541 cifs_lock_secret = get_random_u32();
1542
1543 if (cifs_max_pending < 2) {
1544 cifs_max_pending = 2;
1545 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1546 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1547 cifs_max_pending = CIFS_MAX_REQ;
1548 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1549 CIFS_MAX_REQ);
1550 }
1551
1552 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1553 if (!cifsiod_wq) {
1554 rc = -ENOMEM;
1555 goto out_clean_proc;
1556 }
1557
1558 /*
1559 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1560 * so that we don't launch too many worker threads but
1561 * Documentation/core-api/workqueue.rst recommends setting it to 0
1562 */
1563
1564 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1565 decrypt_wq = alloc_workqueue("smb3decryptd",
1566 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1567 if (!decrypt_wq) {
1568 rc = -ENOMEM;
1569 goto out_destroy_cifsiod_wq;
1570 }
1571
1572 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1573 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1574 if (!fileinfo_put_wq) {
1575 rc = -ENOMEM;
1576 goto out_destroy_decrypt_wq;
1577 }
1578
1579 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1580 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1581 if (!cifsoplockd_wq) {
1582 rc = -ENOMEM;
1583 goto out_destroy_fileinfo_put_wq;
1584 }
1585
1586 rc = cifs_fscache_register();
1587 if (rc)
1588 goto out_destroy_cifsoplockd_wq;
1589
1590 rc = cifs_init_inodecache();
1591 if (rc)
1592 goto out_unreg_fscache;
1593
1594 rc = cifs_init_mids();
1595 if (rc)
1596 goto out_destroy_inodecache;
1597
1598 rc = cifs_init_request_bufs();
1599 if (rc)
1600 goto out_destroy_mids;
1601
1602#ifdef CONFIG_CIFS_DFS_UPCALL
1603 rc = dfs_cache_init();
1604 if (rc)
1605 goto out_destroy_request_bufs;
1606#endif /* CONFIG_CIFS_DFS_UPCALL */
1607#ifdef CONFIG_CIFS_UPCALL
1608 rc = init_cifs_spnego();
1609 if (rc)
1610 goto out_destroy_dfs_cache;
1611#endif /* CONFIG_CIFS_UPCALL */
1612
1613 rc = init_cifs_idmap();
1614 if (rc)
1615 goto out_register_key_type;
1616
1617 rc = register_filesystem(&cifs_fs_type);
1618 if (rc)
1619 goto out_init_cifs_idmap;
1620
1621 rc = register_filesystem(&smb3_fs_type);
1622 if (rc) {
1623 unregister_filesystem(&cifs_fs_type);
1624 goto out_init_cifs_idmap;
1625 }
1626
1627 return 0;
1628
1629out_init_cifs_idmap:
1630 exit_cifs_idmap();
1631out_register_key_type:
1632#ifdef CONFIG_CIFS_UPCALL
1633 exit_cifs_spnego();
1634out_destroy_dfs_cache:
1635#endif
1636#ifdef CONFIG_CIFS_DFS_UPCALL
1637 dfs_cache_destroy();
1638out_destroy_request_bufs:
1639#endif
1640 cifs_destroy_request_bufs();
1641out_destroy_mids:
1642 cifs_destroy_mids();
1643out_destroy_inodecache:
1644 cifs_destroy_inodecache();
1645out_unreg_fscache:
1646 cifs_fscache_unregister();
1647out_destroy_cifsoplockd_wq:
1648 destroy_workqueue(cifsoplockd_wq);
1649out_destroy_fileinfo_put_wq:
1650 destroy_workqueue(fileinfo_put_wq);
1651out_destroy_decrypt_wq:
1652 destroy_workqueue(decrypt_wq);
1653out_destroy_cifsiod_wq:
1654 destroy_workqueue(cifsiod_wq);
1655out_clean_proc:
1656 cifs_proc_clean();
1657 return rc;
1658}
1659
1660static void __exit
1661exit_cifs(void)
1662{
1663 cifs_dbg(NOISY, "exit_smb3\n");
1664 unregister_filesystem(&cifs_fs_type);
1665 unregister_filesystem(&smb3_fs_type);
1666 cifs_dfs_release_automount_timer();
1667 exit_cifs_idmap();
1668#ifdef CONFIG_CIFS_UPCALL
1669 exit_cifs_spnego();
1670#endif
1671#ifdef CONFIG_CIFS_DFS_UPCALL
1672 dfs_cache_destroy();
1673#endif
1674 cifs_destroy_request_bufs();
1675 cifs_destroy_mids();
1676 cifs_destroy_inodecache();
1677 cifs_fscache_unregister();
1678 destroy_workqueue(cifsoplockd_wq);
1679 destroy_workqueue(decrypt_wq);
1680 destroy_workqueue(fileinfo_put_wq);
1681 destroy_workqueue(cifsiod_wq);
1682 cifs_proc_clean();
1683}
1684
1685MODULE_AUTHOR("Steve French");
1686MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1687MODULE_DESCRIPTION
1688 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1689 "also older servers complying with the SNIA CIFS Specification)");
1690MODULE_VERSION(CIFS_VERSION);
1691MODULE_SOFTDEP("ecb");
1692MODULE_SOFTDEP("hmac");
1693MODULE_SOFTDEP("md4");
1694MODULE_SOFTDEP("md5");
1695MODULE_SOFTDEP("nls");
1696MODULE_SOFTDEP("aes");
1697MODULE_SOFTDEP("cmac");
1698MODULE_SOFTDEP("sha256");
1699MODULE_SOFTDEP("sha512");
1700MODULE_SOFTDEP("aead2");
1701MODULE_SOFTDEP("ccm");
1702MODULE_SOFTDEP("gcm");
1703module_init(init_cifs)
1704module_exit(exit_cifs)