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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 *cifsoplockd_wq;
123__u32 cifs_lock_secret;
124
125/*
126 * Bumps refcount for cifs super block.
127 * Note that it should be only called if a referece to VFS super block is
128 * already held, e.g. in open-type syscalls context. Otherwise it can race with
129 * atomic_dec_and_test in deactivate_locked_super.
130 */
131void
132cifs_sb_active(struct super_block *sb)
133{
134 struct cifs_sb_info *server = CIFS_SB(sb);
135
136 if (atomic_inc_return(&server->active) == 1)
137 atomic_inc(&sb->s_active);
138}
139
140void
141cifs_sb_deactive(struct super_block *sb)
142{
143 struct cifs_sb_info *server = CIFS_SB(sb);
144
145 if (atomic_dec_and_test(&server->active))
146 deactivate_super(sb);
147}
148
149static int
150cifs_read_super(struct super_block *sb)
151{
152 struct inode *inode;
153 struct cifs_sb_info *cifs_sb;
154 struct cifs_tcon *tcon;
155 struct timespec64 ts;
156 int rc = 0;
157
158 cifs_sb = CIFS_SB(sb);
159 tcon = cifs_sb_master_tcon(cifs_sb);
160
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
162 sb->s_flags |= SB_POSIXACL;
163
164 if (tcon->snapshot_time)
165 sb->s_flags |= SB_RDONLY;
166
167 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
168 sb->s_maxbytes = MAX_LFS_FILESIZE;
169 else
170 sb->s_maxbytes = MAX_NON_LFS;
171
172 /*
173 * Some very old servers like DOS and OS/2 used 2 second granularity
174 * (while all current servers use 100ns granularity - see MS-DTYP)
175 * but 1 second is the maximum allowed granularity for the VFS
176 * so for old servers set time granularity to 1 second while for
177 * everything else (current servers) set it to 100ns.
178 */
179 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
180 ((tcon->ses->capabilities &
181 tcon->ses->server->vals->cap_nt_find) == 0) &&
182 !tcon->unix_ext) {
183 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
184 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
185 sb->s_time_min = ts.tv_sec;
186 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
187 cpu_to_le16(SMB_TIME_MAX), 0);
188 sb->s_time_max = ts.tv_sec;
189 } else {
190 /*
191 * Almost every server, including all SMB2+, uses DCE TIME
192 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
193 */
194 sb->s_time_gran = 100;
195 ts = cifs_NTtimeToUnix(0);
196 sb->s_time_min = ts.tv_sec;
197 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
198 sb->s_time_max = ts.tv_sec;
199 }
200
201 sb->s_magic = CIFS_MAGIC_NUMBER;
202 sb->s_op = &cifs_super_ops;
203 sb->s_xattr = cifs_xattr_handlers;
204 rc = super_setup_bdi(sb);
205 if (rc)
206 goto out_no_root;
207 /* tune readahead according to rsize */
208 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
209
210 sb->s_blocksize = CIFS_MAX_MSGSIZE;
211 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
212 inode = cifs_root_iget(sb);
213
214 if (IS_ERR(inode)) {
215 rc = PTR_ERR(inode);
216 goto out_no_root;
217 }
218
219 if (tcon->nocase)
220 sb->s_d_op = &cifs_ci_dentry_ops;
221 else
222 sb->s_d_op = &cifs_dentry_ops;
223
224 sb->s_root = d_make_root(inode);
225 if (!sb->s_root) {
226 rc = -ENOMEM;
227 goto out_no_root;
228 }
229
230#ifdef CONFIG_CIFS_NFSD_EXPORT
231 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
232 cifs_dbg(FYI, "export ops supported\n");
233 sb->s_export_op = &cifs_export_ops;
234 }
235#endif /* CONFIG_CIFS_NFSD_EXPORT */
236
237 return 0;
238
239out_no_root:
240 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
241 return rc;
242}
243
244static void cifs_kill_sb(struct super_block *sb)
245{
246 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
247 kill_anon_super(sb);
248 cifs_umount(cifs_sb);
249}
250
251static int
252cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
253{
254 struct super_block *sb = dentry->d_sb;
255 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
256 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
257 struct TCP_Server_Info *server = tcon->ses->server;
258 unsigned int xid;
259 int rc = 0;
260
261 xid = get_xid();
262
263 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
264 buf->f_namelen =
265 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
266 else
267 buf->f_namelen = PATH_MAX;
268
269 buf->f_fsid.val[0] = tcon->vol_serial_number;
270 /* are using part of create time for more randomness, see man statfs */
271 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
272
273 buf->f_files = 0; /* undefined */
274 buf->f_ffree = 0; /* unlimited */
275
276 if (server->ops->queryfs)
277 rc = server->ops->queryfs(xid, tcon, buf);
278
279 free_xid(xid);
280 return 0;
281}
282
283static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
284{
285 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
286 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
287 struct TCP_Server_Info *server = tcon->ses->server;
288
289 if (server->ops->fallocate)
290 return server->ops->fallocate(file, tcon, mode, off, len);
291
292 return -EOPNOTSUPP;
293}
294
295static int cifs_permission(struct inode *inode, int mask)
296{
297 struct cifs_sb_info *cifs_sb;
298
299 cifs_sb = CIFS_SB(inode->i_sb);
300
301 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
302 if ((mask & MAY_EXEC) && !execute_ok(inode))
303 return -EACCES;
304 else
305 return 0;
306 } else /* file mode might have been restricted at mount time
307 on the client (above and beyond ACL on servers) for
308 servers which do not support setting and viewing mode bits,
309 so allowing client to check permissions is useful */
310 return generic_permission(inode, mask);
311}
312
313static struct kmem_cache *cifs_inode_cachep;
314static struct kmem_cache *cifs_req_cachep;
315static struct kmem_cache *cifs_mid_cachep;
316static struct kmem_cache *cifs_sm_req_cachep;
317mempool_t *cifs_sm_req_poolp;
318mempool_t *cifs_req_poolp;
319mempool_t *cifs_mid_poolp;
320
321static struct inode *
322cifs_alloc_inode(struct super_block *sb)
323{
324 struct cifsInodeInfo *cifs_inode;
325 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
326 if (!cifs_inode)
327 return NULL;
328 cifs_inode->cifsAttrs = 0x20; /* default */
329 cifs_inode->time = 0;
330 /*
331 * Until the file is open and we have gotten oplock info back from the
332 * server, can not assume caching of file data or metadata.
333 */
334 cifs_set_oplock_level(cifs_inode, 0);
335 cifs_inode->flags = 0;
336 spin_lock_init(&cifs_inode->writers_lock);
337 cifs_inode->writers = 0;
338 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
339 cifs_inode->server_eof = 0;
340 cifs_inode->uniqueid = 0;
341 cifs_inode->createtime = 0;
342 cifs_inode->epoch = 0;
343 spin_lock_init(&cifs_inode->open_file_lock);
344 generate_random_uuid(cifs_inode->lease_key);
345
346 /*
347 * Can not set i_flags here - they get immediately overwritten to zero
348 * by the VFS.
349 */
350 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
351 INIT_LIST_HEAD(&cifs_inode->openFileList);
352 INIT_LIST_HEAD(&cifs_inode->llist);
353 return &cifs_inode->vfs_inode;
354}
355
356static void
357cifs_free_inode(struct inode *inode)
358{
359 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
360}
361
362static void
363cifs_evict_inode(struct inode *inode)
364{
365 truncate_inode_pages_final(&inode->i_data);
366 clear_inode(inode);
367 cifs_fscache_release_inode_cookie(inode);
368}
369
370static void
371cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
372{
373 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
374 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
375
376 seq_puts(s, ",addr=");
377
378 switch (server->dstaddr.ss_family) {
379 case AF_INET:
380 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
381 break;
382 case AF_INET6:
383 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
384 if (sa6->sin6_scope_id)
385 seq_printf(s, "%%%u", sa6->sin6_scope_id);
386 break;
387 default:
388 seq_puts(s, "(unknown)");
389 }
390 if (server->rdma)
391 seq_puts(s, ",rdma");
392}
393
394static void
395cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
396{
397 if (ses->sectype == Unspecified) {
398 if (ses->user_name == NULL)
399 seq_puts(s, ",sec=none");
400 return;
401 }
402
403 seq_puts(s, ",sec=");
404
405 switch (ses->sectype) {
406 case LANMAN:
407 seq_puts(s, "lanman");
408 break;
409 case NTLMv2:
410 seq_puts(s, "ntlmv2");
411 break;
412 case NTLM:
413 seq_puts(s, "ntlm");
414 break;
415 case Kerberos:
416 seq_printf(s, "krb5,cruid=%u", from_kuid_munged(&init_user_ns,ses->cred_uid));
417 break;
418 case RawNTLMSSP:
419 seq_puts(s, "ntlmssp");
420 break;
421 default:
422 /* shouldn't ever happen */
423 seq_puts(s, "unknown");
424 break;
425 }
426
427 if (ses->sign)
428 seq_puts(s, "i");
429}
430
431static void
432cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
433{
434 seq_puts(s, ",cache=");
435
436 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
437 seq_puts(s, "strict");
438 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
439 seq_puts(s, "none");
440 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
441 seq_puts(s, "singleclient"); /* assume only one client access */
442 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
443 seq_puts(s, "ro"); /* read only caching assumed */
444 else
445 seq_puts(s, "loose");
446}
447
448static void
449cifs_show_nls(struct seq_file *s, struct nls_table *cur)
450{
451 struct nls_table *def;
452
453 /* Display iocharset= option if it's not default charset */
454 def = load_nls_default();
455 if (def != cur)
456 seq_printf(s, ",iocharset=%s", cur->charset);
457 unload_nls(def);
458}
459
460/*
461 * cifs_show_options() is for displaying mount options in /proc/mounts.
462 * Not all settable options are displayed but most of the important
463 * ones are.
464 */
465static int
466cifs_show_options(struct seq_file *s, struct dentry *root)
467{
468 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
469 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
470 struct sockaddr *srcaddr;
471 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
472
473 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
474 cifs_show_security(s, tcon->ses);
475 cifs_show_cache_flavor(s, cifs_sb);
476
477 if (tcon->no_lease)
478 seq_puts(s, ",nolease");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
480 seq_puts(s, ",multiuser");
481 else if (tcon->ses->user_name)
482 seq_show_option(s, "username", tcon->ses->user_name);
483
484 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
485 seq_show_option(s, "domain", tcon->ses->domainName);
486
487 if (srcaddr->sa_family != AF_UNSPEC) {
488 struct sockaddr_in *saddr4;
489 struct sockaddr_in6 *saddr6;
490 saddr4 = (struct sockaddr_in *)srcaddr;
491 saddr6 = (struct sockaddr_in6 *)srcaddr;
492 if (srcaddr->sa_family == AF_INET6)
493 seq_printf(s, ",srcaddr=%pI6c",
494 &saddr6->sin6_addr);
495 else if (srcaddr->sa_family == AF_INET)
496 seq_printf(s, ",srcaddr=%pI4",
497 &saddr4->sin_addr.s_addr);
498 else
499 seq_printf(s, ",srcaddr=BAD-AF:%i",
500 (int)(srcaddr->sa_family));
501 }
502
503 seq_printf(s, ",uid=%u",
504 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
505 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
506 seq_puts(s, ",forceuid");
507 else
508 seq_puts(s, ",noforceuid");
509
510 seq_printf(s, ",gid=%u",
511 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
513 seq_puts(s, ",forcegid");
514 else
515 seq_puts(s, ",noforcegid");
516
517 cifs_show_address(s, tcon->ses->server);
518
519 if (!tcon->unix_ext)
520 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
521 cifs_sb->mnt_file_mode,
522 cifs_sb->mnt_dir_mode);
523
524 cifs_show_nls(s, cifs_sb->local_nls);
525
526 if (tcon->seal)
527 seq_puts(s, ",seal");
528 if (tcon->nocase)
529 seq_puts(s, ",nocase");
530 if (tcon->local_lease)
531 seq_puts(s, ",locallease");
532 if (tcon->retry)
533 seq_puts(s, ",hard");
534 else
535 seq_puts(s, ",soft");
536 if (tcon->use_persistent)
537 seq_puts(s, ",persistenthandles");
538 else if (tcon->use_resilient)
539 seq_puts(s, ",resilienthandles");
540 if (tcon->posix_extensions)
541 seq_puts(s, ",posix");
542 else if (tcon->unix_ext)
543 seq_puts(s, ",unix");
544 else
545 seq_puts(s, ",nounix");
546 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
547 seq_puts(s, ",nodfs");
548 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
549 seq_puts(s, ",posixpaths");
550 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
551 seq_puts(s, ",setuids");
552 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
553 seq_puts(s, ",idsfromsid");
554 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
555 seq_puts(s, ",serverino");
556 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
557 seq_puts(s, ",rwpidforward");
558 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
559 seq_puts(s, ",forcemand");
560 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
561 seq_puts(s, ",nouser_xattr");
562 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
563 seq_puts(s, ",mapchars");
564 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
565 seq_puts(s, ",mapposix");
566 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
567 seq_puts(s, ",sfu");
568 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
569 seq_puts(s, ",nobrl");
570 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
571 seq_puts(s, ",nohandlecache");
572 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
573 seq_puts(s, ",modefromsid");
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
575 seq_puts(s, ",cifsacl");
576 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
577 seq_puts(s, ",dynperm");
578 if (root->d_sb->s_flags & SB_POSIXACL)
579 seq_puts(s, ",acl");
580 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
581 seq_puts(s, ",mfsymlinks");
582 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
583 seq_puts(s, ",fsc");
584 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
585 seq_puts(s, ",nostrictsync");
586 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
587 seq_puts(s, ",noperm");
588 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
589 seq_printf(s, ",backupuid=%u",
590 from_kuid_munged(&init_user_ns,
591 cifs_sb->mnt_backupuid));
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
593 seq_printf(s, ",backupgid=%u",
594 from_kgid_munged(&init_user_ns,
595 cifs_sb->mnt_backupgid));
596
597 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
598 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
599 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
600 if (tcon->ses->server->min_offload)
601 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
602 seq_printf(s, ",echo_interval=%lu",
603 tcon->ses->server->echo_interval / HZ);
604
605 /* Only display max_credits if it was overridden on mount */
606 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
607 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
608
609 if (tcon->snapshot_time)
610 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
611 if (tcon->handle_timeout)
612 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
613 /* convert actimeo and display it in seconds */
614 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
615
616 return 0;
617}
618
619static void cifs_umount_begin(struct super_block *sb)
620{
621 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
622 struct cifs_tcon *tcon;
623
624 if (cifs_sb == NULL)
625 return;
626
627 tcon = cifs_sb_master_tcon(cifs_sb);
628
629 spin_lock(&cifs_tcp_ses_lock);
630 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
631 /* we have other mounts to same share or we have
632 already tried to force umount this and woken up
633 all waiting network requests, nothing to do */
634 spin_unlock(&cifs_tcp_ses_lock);
635 return;
636 } else if (tcon->tc_count == 1)
637 tcon->tidStatus = CifsExiting;
638 spin_unlock(&cifs_tcp_ses_lock);
639
640 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
641 /* cancel_notify_requests(tcon); */
642 if (tcon->ses && tcon->ses->server) {
643 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
644 wake_up_all(&tcon->ses->server->request_q);
645 wake_up_all(&tcon->ses->server->response_q);
646 msleep(1); /* yield */
647 /* we have to kick the requests once more */
648 wake_up_all(&tcon->ses->server->response_q);
649 msleep(1);
650 }
651
652 return;
653}
654
655#ifdef CONFIG_CIFS_STATS2
656static int cifs_show_stats(struct seq_file *s, struct dentry *root)
657{
658 /* BB FIXME */
659 return 0;
660}
661#endif
662
663static int cifs_remount(struct super_block *sb, int *flags, char *data)
664{
665 sync_filesystem(sb);
666 *flags |= SB_NODIRATIME;
667 return 0;
668}
669
670static int cifs_drop_inode(struct inode *inode)
671{
672 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
673
674 /* no serverino => unconditional eviction */
675 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
676 generic_drop_inode(inode);
677}
678
679static const struct super_operations cifs_super_ops = {
680 .statfs = cifs_statfs,
681 .alloc_inode = cifs_alloc_inode,
682 .free_inode = cifs_free_inode,
683 .drop_inode = cifs_drop_inode,
684 .evict_inode = cifs_evict_inode,
685/* .delete_inode = cifs_delete_inode, */ /* Do not need above
686 function unless later we add lazy close of inodes or unless the
687 kernel forgets to call us with the same number of releases (closes)
688 as opens */
689 .show_options = cifs_show_options,
690 .umount_begin = cifs_umount_begin,
691 .remount_fs = cifs_remount,
692#ifdef CONFIG_CIFS_STATS2
693 .show_stats = cifs_show_stats,
694#endif
695};
696
697/*
698 * Get root dentry from superblock according to prefix path mount option.
699 * Return dentry with refcount + 1 on success and NULL otherwise.
700 */
701static struct dentry *
702cifs_get_root(struct smb_vol *vol, struct super_block *sb)
703{
704 struct dentry *dentry;
705 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
706 char *full_path = NULL;
707 char *s, *p;
708 char sep;
709
710 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
711 return dget(sb->s_root);
712
713 full_path = cifs_build_path_to_root(vol, cifs_sb,
714 cifs_sb_master_tcon(cifs_sb), 0);
715 if (full_path == NULL)
716 return ERR_PTR(-ENOMEM);
717
718 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
719
720 sep = CIFS_DIR_SEP(cifs_sb);
721 dentry = dget(sb->s_root);
722 p = s = full_path;
723
724 do {
725 struct inode *dir = d_inode(dentry);
726 struct dentry *child;
727
728 if (!dir) {
729 dput(dentry);
730 dentry = ERR_PTR(-ENOENT);
731 break;
732 }
733 if (!S_ISDIR(dir->i_mode)) {
734 dput(dentry);
735 dentry = ERR_PTR(-ENOTDIR);
736 break;
737 }
738
739 /* skip separators */
740 while (*s == sep)
741 s++;
742 if (!*s)
743 break;
744 p = s++;
745 /* next separator */
746 while (*s && *s != sep)
747 s++;
748
749 child = lookup_one_len_unlocked(p, dentry, s - p);
750 dput(dentry);
751 dentry = child;
752 } while (!IS_ERR(dentry));
753 kfree(full_path);
754 return dentry;
755}
756
757static int cifs_set_super(struct super_block *sb, void *data)
758{
759 struct cifs_mnt_data *mnt_data = data;
760 sb->s_fs_info = mnt_data->cifs_sb;
761 return set_anon_super(sb, NULL);
762}
763
764static struct dentry *
765cifs_smb3_do_mount(struct file_system_type *fs_type,
766 int flags, const char *dev_name, void *data, bool is_smb3)
767{
768 int rc;
769 struct super_block *sb;
770 struct cifs_sb_info *cifs_sb;
771 struct smb_vol *volume_info;
772 struct cifs_mnt_data mnt_data;
773 struct dentry *root;
774
775 /*
776 * Prints in Kernel / CIFS log the attempted mount operation
777 * If CIFS_DEBUG && cifs_FYI
778 */
779 if (cifsFYI)
780 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
781 else
782 cifs_info("Attempting to mount %s\n", dev_name);
783
784 volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
785 if (IS_ERR(volume_info))
786 return ERR_CAST(volume_info);
787
788 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
789 if (cifs_sb == NULL) {
790 root = ERR_PTR(-ENOMEM);
791 goto out_nls;
792 }
793
794 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
795 if (cifs_sb->mountdata == NULL) {
796 root = ERR_PTR(-ENOMEM);
797 goto out_free;
798 }
799
800 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
801 if (rc) {
802 root = ERR_PTR(rc);
803 goto out_free;
804 }
805
806 rc = cifs_mount(cifs_sb, volume_info);
807 if (rc) {
808 if (!(flags & SB_SILENT))
809 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
810 rc);
811 root = ERR_PTR(rc);
812 goto out_free;
813 }
814
815 mnt_data.vol = volume_info;
816 mnt_data.cifs_sb = cifs_sb;
817 mnt_data.flags = flags;
818
819 /* BB should we make this contingent on mount parm? */
820 flags |= SB_NODIRATIME | SB_NOATIME;
821
822 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
823 if (IS_ERR(sb)) {
824 root = ERR_CAST(sb);
825 cifs_umount(cifs_sb);
826 goto out;
827 }
828
829 if (sb->s_root) {
830 cifs_dbg(FYI, "Use existing superblock\n");
831 cifs_umount(cifs_sb);
832 } else {
833 rc = cifs_read_super(sb);
834 if (rc) {
835 root = ERR_PTR(rc);
836 goto out_super;
837 }
838
839 sb->s_flags |= SB_ACTIVE;
840 }
841
842 root = cifs_get_root(volume_info, sb);
843 if (IS_ERR(root))
844 goto out_super;
845
846 cifs_dbg(FYI, "dentry root is: %p\n", root);
847 goto out;
848
849out_super:
850 deactivate_locked_super(sb);
851out:
852 cifs_cleanup_volume_info(volume_info);
853 return root;
854
855out_free:
856 kfree(cifs_sb->prepath);
857 kfree(cifs_sb->mountdata);
858 kfree(cifs_sb);
859out_nls:
860 unload_nls(volume_info->local_nls);
861 goto out;
862}
863
864static struct dentry *
865smb3_do_mount(struct file_system_type *fs_type,
866 int flags, const char *dev_name, void *data)
867{
868 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, true);
869}
870
871static struct dentry *
872cifs_do_mount(struct file_system_type *fs_type,
873 int flags, const char *dev_name, void *data)
874{
875 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, false);
876}
877
878static ssize_t
879cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
880{
881 ssize_t rc;
882 struct inode *inode = file_inode(iocb->ki_filp);
883
884 if (iocb->ki_filp->f_flags & O_DIRECT)
885 return cifs_user_readv(iocb, iter);
886
887 rc = cifs_revalidate_mapping(inode);
888 if (rc)
889 return rc;
890
891 return generic_file_read_iter(iocb, iter);
892}
893
894static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
895{
896 struct inode *inode = file_inode(iocb->ki_filp);
897 struct cifsInodeInfo *cinode = CIFS_I(inode);
898 ssize_t written;
899 int rc;
900
901 if (iocb->ki_filp->f_flags & O_DIRECT) {
902 written = cifs_user_writev(iocb, from);
903 if (written > 0 && CIFS_CACHE_READ(cinode)) {
904 cifs_zap_mapping(inode);
905 cifs_dbg(FYI,
906 "Set no oplock for inode=%p after a write operation\n",
907 inode);
908 cinode->oplock = 0;
909 }
910 return written;
911 }
912
913 written = cifs_get_writer(cinode);
914 if (written)
915 return written;
916
917 written = generic_file_write_iter(iocb, from);
918
919 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
920 goto out;
921
922 rc = filemap_fdatawrite(inode->i_mapping);
923 if (rc)
924 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
925 rc, inode);
926
927out:
928 cifs_put_writer(cinode);
929 return written;
930}
931
932static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
933{
934 struct cifsFileInfo *cfile = file->private_data;
935 struct cifs_tcon *tcon;
936
937 /*
938 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
939 * the cached file length
940 */
941 if (whence != SEEK_SET && whence != SEEK_CUR) {
942 int rc;
943 struct inode *inode = file_inode(file);
944
945 /*
946 * We need to be sure that all dirty pages are written and the
947 * server has the newest file length.
948 */
949 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
950 inode->i_mapping->nrpages != 0) {
951 rc = filemap_fdatawait(inode->i_mapping);
952 if (rc) {
953 mapping_set_error(inode->i_mapping, rc);
954 return rc;
955 }
956 }
957 /*
958 * Some applications poll for the file length in this strange
959 * way so we must seek to end on non-oplocked files by
960 * setting the revalidate time to zero.
961 */
962 CIFS_I(inode)->time = 0;
963
964 rc = cifs_revalidate_file_attr(file);
965 if (rc < 0)
966 return (loff_t)rc;
967 }
968 if (cfile && cfile->tlink) {
969 tcon = tlink_tcon(cfile->tlink);
970 if (tcon->ses->server->ops->llseek)
971 return tcon->ses->server->ops->llseek(file, tcon,
972 offset, whence);
973 }
974 return generic_file_llseek(file, offset, whence);
975}
976
977static int
978cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
979{
980 /*
981 * Note that this is called by vfs setlease with i_lock held to
982 * protect *lease from going away.
983 */
984 struct inode *inode = file_inode(file);
985 struct cifsFileInfo *cfile = file->private_data;
986
987 if (!(S_ISREG(inode->i_mode)))
988 return -EINVAL;
989
990 /* Check if file is oplocked if this is request for new lease */
991 if (arg == F_UNLCK ||
992 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
993 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
994 return generic_setlease(file, arg, lease, priv);
995 else if (tlink_tcon(cfile->tlink)->local_lease &&
996 !CIFS_CACHE_READ(CIFS_I(inode)))
997 /*
998 * If the server claims to support oplock on this file, then we
999 * still need to check oplock even if the local_lease mount
1000 * option is set, but there are servers which do not support
1001 * oplock for which this mount option may be useful if the user
1002 * knows that the file won't be changed on the server by anyone
1003 * else.
1004 */
1005 return generic_setlease(file, arg, lease, priv);
1006 else
1007 return -EAGAIN;
1008}
1009
1010struct file_system_type cifs_fs_type = {
1011 .owner = THIS_MODULE,
1012 .name = "cifs",
1013 .mount = cifs_do_mount,
1014 .kill_sb = cifs_kill_sb,
1015 /* .fs_flags */
1016};
1017MODULE_ALIAS_FS("cifs");
1018
1019static struct file_system_type smb3_fs_type = {
1020 .owner = THIS_MODULE,
1021 .name = "smb3",
1022 .mount = smb3_do_mount,
1023 .kill_sb = cifs_kill_sb,
1024 /* .fs_flags */
1025};
1026MODULE_ALIAS_FS("smb3");
1027MODULE_ALIAS("smb3");
1028
1029const struct inode_operations cifs_dir_inode_ops = {
1030 .create = cifs_create,
1031 .atomic_open = cifs_atomic_open,
1032 .lookup = cifs_lookup,
1033 .getattr = cifs_getattr,
1034 .unlink = cifs_unlink,
1035 .link = cifs_hardlink,
1036 .mkdir = cifs_mkdir,
1037 .rmdir = cifs_rmdir,
1038 .rename = cifs_rename2,
1039 .permission = cifs_permission,
1040 .setattr = cifs_setattr,
1041 .symlink = cifs_symlink,
1042 .mknod = cifs_mknod,
1043 .listxattr = cifs_listxattr,
1044};
1045
1046const struct inode_operations cifs_file_inode_ops = {
1047 .setattr = cifs_setattr,
1048 .getattr = cifs_getattr,
1049 .permission = cifs_permission,
1050 .listxattr = cifs_listxattr,
1051 .fiemap = cifs_fiemap,
1052};
1053
1054const struct inode_operations cifs_symlink_inode_ops = {
1055 .get_link = cifs_get_link,
1056 .permission = cifs_permission,
1057 .listxattr = cifs_listxattr,
1058};
1059
1060static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1061 struct file *dst_file, loff_t destoff, loff_t len,
1062 unsigned int remap_flags)
1063{
1064 struct inode *src_inode = file_inode(src_file);
1065 struct inode *target_inode = file_inode(dst_file);
1066 struct cifsFileInfo *smb_file_src = src_file->private_data;
1067 struct cifsFileInfo *smb_file_target;
1068 struct cifs_tcon *target_tcon;
1069 unsigned int xid;
1070 int rc;
1071
1072 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1073 return -EINVAL;
1074
1075 cifs_dbg(FYI, "clone range\n");
1076
1077 xid = get_xid();
1078
1079 if (!src_file->private_data || !dst_file->private_data) {
1080 rc = -EBADF;
1081 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1082 goto out;
1083 }
1084
1085 smb_file_target = dst_file->private_data;
1086 target_tcon = tlink_tcon(smb_file_target->tlink);
1087
1088 /*
1089 * Note: cifs case is easier than btrfs since server responsible for
1090 * checks for proper open modes and file type and if it wants
1091 * server could even support copy of range where source = target
1092 */
1093 lock_two_nondirectories(target_inode, src_inode);
1094
1095 if (len == 0)
1096 len = src_inode->i_size - off;
1097
1098 cifs_dbg(FYI, "about to flush pages\n");
1099 /* should we flush first and last page first */
1100 truncate_inode_pages_range(&target_inode->i_data, destoff,
1101 PAGE_ALIGN(destoff + len)-1);
1102
1103 if (target_tcon->ses->server->ops->duplicate_extents)
1104 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1105 smb_file_src, smb_file_target, off, len, destoff);
1106 else
1107 rc = -EOPNOTSUPP;
1108
1109 /* force revalidate of size and timestamps of target file now
1110 that target is updated on the server */
1111 CIFS_I(target_inode)->time = 0;
1112 /* although unlocking in the reverse order from locking is not
1113 strictly necessary here it is a little cleaner to be consistent */
1114 unlock_two_nondirectories(src_inode, target_inode);
1115out:
1116 free_xid(xid);
1117 return rc < 0 ? rc : len;
1118}
1119
1120ssize_t cifs_file_copychunk_range(unsigned int xid,
1121 struct file *src_file, loff_t off,
1122 struct file *dst_file, loff_t destoff,
1123 size_t len, unsigned int flags)
1124{
1125 struct inode *src_inode = file_inode(src_file);
1126 struct inode *target_inode = file_inode(dst_file);
1127 struct cifsFileInfo *smb_file_src;
1128 struct cifsFileInfo *smb_file_target;
1129 struct cifs_tcon *src_tcon;
1130 struct cifs_tcon *target_tcon;
1131 ssize_t rc;
1132
1133 cifs_dbg(FYI, "copychunk range\n");
1134
1135 if (!src_file->private_data || !dst_file->private_data) {
1136 rc = -EBADF;
1137 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1138 goto out;
1139 }
1140
1141 rc = -EXDEV;
1142 smb_file_target = dst_file->private_data;
1143 smb_file_src = src_file->private_data;
1144 src_tcon = tlink_tcon(smb_file_src->tlink);
1145 target_tcon = tlink_tcon(smb_file_target->tlink);
1146
1147 if (src_tcon->ses != target_tcon->ses) {
1148 cifs_dbg(VFS, "source and target of copy not on same server\n");
1149 goto out;
1150 }
1151
1152 rc = -EOPNOTSUPP;
1153 if (!target_tcon->ses->server->ops->copychunk_range)
1154 goto out;
1155
1156 /*
1157 * Note: cifs case is easier than btrfs since server responsible for
1158 * checks for proper open modes and file type and if it wants
1159 * server could even support copy of range where source = target
1160 */
1161 lock_two_nondirectories(target_inode, src_inode);
1162
1163 cifs_dbg(FYI, "about to flush pages\n");
1164 /* should we flush first and last page first */
1165 truncate_inode_pages(&target_inode->i_data, 0);
1166
1167 rc = file_modified(dst_file);
1168 if (!rc)
1169 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1170 smb_file_src, smb_file_target, off, len, destoff);
1171
1172 file_accessed(src_file);
1173
1174 /* force revalidate of size and timestamps of target file now
1175 * that target is updated on the server
1176 */
1177 CIFS_I(target_inode)->time = 0;
1178 /* although unlocking in the reverse order from locking is not
1179 * strictly necessary here it is a little cleaner to be consistent
1180 */
1181 unlock_two_nondirectories(src_inode, target_inode);
1182
1183out:
1184 return rc;
1185}
1186
1187/*
1188 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1189 * is a dummy operation.
1190 */
1191static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1192{
1193 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1194 file, datasync);
1195
1196 return 0;
1197}
1198
1199static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1200 struct file *dst_file, loff_t destoff,
1201 size_t len, unsigned int flags)
1202{
1203 unsigned int xid = get_xid();
1204 ssize_t rc;
1205
1206 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1207 len, flags);
1208 free_xid(xid);
1209
1210 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1211 rc = generic_copy_file_range(src_file, off, dst_file,
1212 destoff, len, flags);
1213 return rc;
1214}
1215
1216const struct file_operations cifs_file_ops = {
1217 .read_iter = cifs_loose_read_iter,
1218 .write_iter = cifs_file_write_iter,
1219 .open = cifs_open,
1220 .release = cifs_close,
1221 .lock = cifs_lock,
1222 .fsync = cifs_fsync,
1223 .flush = cifs_flush,
1224 .mmap = cifs_file_mmap,
1225 .splice_read = generic_file_splice_read,
1226 .splice_write = iter_file_splice_write,
1227 .llseek = cifs_llseek,
1228 .unlocked_ioctl = cifs_ioctl,
1229 .copy_file_range = cifs_copy_file_range,
1230 .remap_file_range = cifs_remap_file_range,
1231 .setlease = cifs_setlease,
1232 .fallocate = cifs_fallocate,
1233};
1234
1235const struct file_operations cifs_file_strict_ops = {
1236 .read_iter = cifs_strict_readv,
1237 .write_iter = cifs_strict_writev,
1238 .open = cifs_open,
1239 .release = cifs_close,
1240 .lock = cifs_lock,
1241 .fsync = cifs_strict_fsync,
1242 .flush = cifs_flush,
1243 .mmap = cifs_file_strict_mmap,
1244 .splice_read = generic_file_splice_read,
1245 .splice_write = iter_file_splice_write,
1246 .llseek = cifs_llseek,
1247 .unlocked_ioctl = cifs_ioctl,
1248 .copy_file_range = cifs_copy_file_range,
1249 .remap_file_range = cifs_remap_file_range,
1250 .setlease = cifs_setlease,
1251 .fallocate = cifs_fallocate,
1252};
1253
1254const struct file_operations cifs_file_direct_ops = {
1255 .read_iter = cifs_direct_readv,
1256 .write_iter = cifs_direct_writev,
1257 .open = cifs_open,
1258 .release = cifs_close,
1259 .lock = cifs_lock,
1260 .fsync = cifs_fsync,
1261 .flush = cifs_flush,
1262 .mmap = cifs_file_mmap,
1263 .splice_read = generic_file_splice_read,
1264 .splice_write = iter_file_splice_write,
1265 .unlocked_ioctl = cifs_ioctl,
1266 .copy_file_range = cifs_copy_file_range,
1267 .remap_file_range = cifs_remap_file_range,
1268 .llseek = cifs_llseek,
1269 .setlease = cifs_setlease,
1270 .fallocate = cifs_fallocate,
1271};
1272
1273const struct file_operations cifs_file_nobrl_ops = {
1274 .read_iter = cifs_loose_read_iter,
1275 .write_iter = cifs_file_write_iter,
1276 .open = cifs_open,
1277 .release = cifs_close,
1278 .fsync = cifs_fsync,
1279 .flush = cifs_flush,
1280 .mmap = cifs_file_mmap,
1281 .splice_read = generic_file_splice_read,
1282 .splice_write = iter_file_splice_write,
1283 .llseek = cifs_llseek,
1284 .unlocked_ioctl = cifs_ioctl,
1285 .copy_file_range = cifs_copy_file_range,
1286 .remap_file_range = cifs_remap_file_range,
1287 .setlease = cifs_setlease,
1288 .fallocate = cifs_fallocate,
1289};
1290
1291const struct file_operations cifs_file_strict_nobrl_ops = {
1292 .read_iter = cifs_strict_readv,
1293 .write_iter = cifs_strict_writev,
1294 .open = cifs_open,
1295 .release = cifs_close,
1296 .fsync = cifs_strict_fsync,
1297 .flush = cifs_flush,
1298 .mmap = cifs_file_strict_mmap,
1299 .splice_read = generic_file_splice_read,
1300 .splice_write = iter_file_splice_write,
1301 .llseek = cifs_llseek,
1302 .unlocked_ioctl = cifs_ioctl,
1303 .copy_file_range = cifs_copy_file_range,
1304 .remap_file_range = cifs_remap_file_range,
1305 .setlease = cifs_setlease,
1306 .fallocate = cifs_fallocate,
1307};
1308
1309const struct file_operations cifs_file_direct_nobrl_ops = {
1310 .read_iter = cifs_direct_readv,
1311 .write_iter = cifs_direct_writev,
1312 .open = cifs_open,
1313 .release = cifs_close,
1314 .fsync = cifs_fsync,
1315 .flush = cifs_flush,
1316 .mmap = cifs_file_mmap,
1317 .splice_read = generic_file_splice_read,
1318 .splice_write = iter_file_splice_write,
1319 .unlocked_ioctl = cifs_ioctl,
1320 .copy_file_range = cifs_copy_file_range,
1321 .remap_file_range = cifs_remap_file_range,
1322 .llseek = cifs_llseek,
1323 .setlease = cifs_setlease,
1324 .fallocate = cifs_fallocate,
1325};
1326
1327const struct file_operations cifs_dir_ops = {
1328 .iterate_shared = cifs_readdir,
1329 .release = cifs_closedir,
1330 .read = generic_read_dir,
1331 .unlocked_ioctl = cifs_ioctl,
1332 .copy_file_range = cifs_copy_file_range,
1333 .remap_file_range = cifs_remap_file_range,
1334 .llseek = generic_file_llseek,
1335 .fsync = cifs_dir_fsync,
1336};
1337
1338static void
1339cifs_init_once(void *inode)
1340{
1341 struct cifsInodeInfo *cifsi = inode;
1342
1343 inode_init_once(&cifsi->vfs_inode);
1344 init_rwsem(&cifsi->lock_sem);
1345}
1346
1347static int __init
1348cifs_init_inodecache(void)
1349{
1350 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1351 sizeof(struct cifsInodeInfo),
1352 0, (SLAB_RECLAIM_ACCOUNT|
1353 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1354 cifs_init_once);
1355 if (cifs_inode_cachep == NULL)
1356 return -ENOMEM;
1357
1358 return 0;
1359}
1360
1361static void
1362cifs_destroy_inodecache(void)
1363{
1364 /*
1365 * Make sure all delayed rcu free inodes are flushed before we
1366 * destroy cache.
1367 */
1368 rcu_barrier();
1369 kmem_cache_destroy(cifs_inode_cachep);
1370}
1371
1372static int
1373cifs_init_request_bufs(void)
1374{
1375 /*
1376 * SMB2 maximum header size is bigger than CIFS one - no problems to
1377 * allocate some more bytes for CIFS.
1378 */
1379 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1380
1381 if (CIFSMaxBufSize < 8192) {
1382 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1383 Unicode path name has to fit in any SMB/CIFS path based frames */
1384 CIFSMaxBufSize = 8192;
1385 } else if (CIFSMaxBufSize > 1024*127) {
1386 CIFSMaxBufSize = 1024 * 127;
1387 } else {
1388 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1389 }
1390/*
1391 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1392 CIFSMaxBufSize, CIFSMaxBufSize);
1393*/
1394 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1395 CIFSMaxBufSize + max_hdr_size, 0,
1396 SLAB_HWCACHE_ALIGN, 0,
1397 CIFSMaxBufSize + max_hdr_size,
1398 NULL);
1399 if (cifs_req_cachep == NULL)
1400 return -ENOMEM;
1401
1402 if (cifs_min_rcv < 1)
1403 cifs_min_rcv = 1;
1404 else if (cifs_min_rcv > 64) {
1405 cifs_min_rcv = 64;
1406 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1407 }
1408
1409 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1410 cifs_req_cachep);
1411
1412 if (cifs_req_poolp == NULL) {
1413 kmem_cache_destroy(cifs_req_cachep);
1414 return -ENOMEM;
1415 }
1416 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1417 almost all handle based requests (but not write response, nor is it
1418 sufficient for path based requests). A smaller size would have
1419 been more efficient (compacting multiple slab items on one 4k page)
1420 for the case in which debug was on, but this larger size allows
1421 more SMBs to use small buffer alloc and is still much more
1422 efficient to alloc 1 per page off the slab compared to 17K (5page)
1423 alloc of large cifs buffers even when page debugging is on */
1424 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1425 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1426 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1427 if (cifs_sm_req_cachep == NULL) {
1428 mempool_destroy(cifs_req_poolp);
1429 kmem_cache_destroy(cifs_req_cachep);
1430 return -ENOMEM;
1431 }
1432
1433 if (cifs_min_small < 2)
1434 cifs_min_small = 2;
1435 else if (cifs_min_small > 256) {
1436 cifs_min_small = 256;
1437 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1438 }
1439
1440 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1441 cifs_sm_req_cachep);
1442
1443 if (cifs_sm_req_poolp == NULL) {
1444 mempool_destroy(cifs_req_poolp);
1445 kmem_cache_destroy(cifs_req_cachep);
1446 kmem_cache_destroy(cifs_sm_req_cachep);
1447 return -ENOMEM;
1448 }
1449
1450 return 0;
1451}
1452
1453static void
1454cifs_destroy_request_bufs(void)
1455{
1456 mempool_destroy(cifs_req_poolp);
1457 kmem_cache_destroy(cifs_req_cachep);
1458 mempool_destroy(cifs_sm_req_poolp);
1459 kmem_cache_destroy(cifs_sm_req_cachep);
1460}
1461
1462static int
1463cifs_init_mids(void)
1464{
1465 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1466 sizeof(struct mid_q_entry), 0,
1467 SLAB_HWCACHE_ALIGN, NULL);
1468 if (cifs_mid_cachep == NULL)
1469 return -ENOMEM;
1470
1471 /* 3 is a reasonable minimum number of simultaneous operations */
1472 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1473 if (cifs_mid_poolp == NULL) {
1474 kmem_cache_destroy(cifs_mid_cachep);
1475 return -ENOMEM;
1476 }
1477
1478 return 0;
1479}
1480
1481static void
1482cifs_destroy_mids(void)
1483{
1484 mempool_destroy(cifs_mid_poolp);
1485 kmem_cache_destroy(cifs_mid_cachep);
1486}
1487
1488static int __init
1489init_cifs(void)
1490{
1491 int rc = 0;
1492 cifs_proc_init();
1493 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1494#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1495 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1496 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1497#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1498/*
1499 * Initialize Global counters
1500 */
1501 atomic_set(&sesInfoAllocCount, 0);
1502 atomic_set(&tconInfoAllocCount, 0);
1503 atomic_set(&tcpSesAllocCount, 0);
1504 atomic_set(&tcpSesReconnectCount, 0);
1505 atomic_set(&tconInfoReconnectCount, 0);
1506
1507 atomic_set(&bufAllocCount, 0);
1508 atomic_set(&smBufAllocCount, 0);
1509#ifdef CONFIG_CIFS_STATS2
1510 atomic_set(&totBufAllocCount, 0);
1511 atomic_set(&totSmBufAllocCount, 0);
1512 if (slow_rsp_threshold < 1)
1513 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1514 else if (slow_rsp_threshold > 32767)
1515 cifs_dbg(VFS,
1516 "slow response threshold set higher than recommended (0 to 32767)\n");
1517#endif /* CONFIG_CIFS_STATS2 */
1518
1519 atomic_set(&midCount, 0);
1520 GlobalCurrentXid = 0;
1521 GlobalTotalActiveXid = 0;
1522 GlobalMaxActiveXid = 0;
1523 spin_lock_init(&cifs_tcp_ses_lock);
1524 spin_lock_init(&GlobalMid_Lock);
1525
1526 cifs_lock_secret = get_random_u32();
1527
1528 if (cifs_max_pending < 2) {
1529 cifs_max_pending = 2;
1530 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1531 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1532 cifs_max_pending = CIFS_MAX_REQ;
1533 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1534 CIFS_MAX_REQ);
1535 }
1536
1537 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1538 if (!cifsiod_wq) {
1539 rc = -ENOMEM;
1540 goto out_clean_proc;
1541 }
1542
1543 /*
1544 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1545 * so that we don't launch too many worker threads but
1546 * Documentation/workqueue.txt recommends setting it to 0
1547 */
1548
1549 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1550 decrypt_wq = alloc_workqueue("smb3decryptd",
1551 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1552 if (!decrypt_wq) {
1553 rc = -ENOMEM;
1554 goto out_destroy_cifsiod_wq;
1555 }
1556
1557 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1558 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1559 if (!cifsoplockd_wq) {
1560 rc = -ENOMEM;
1561 goto out_destroy_decrypt_wq;
1562 }
1563
1564 rc = cifs_fscache_register();
1565 if (rc)
1566 goto out_destroy_cifsoplockd_wq;
1567
1568 rc = cifs_init_inodecache();
1569 if (rc)
1570 goto out_unreg_fscache;
1571
1572 rc = cifs_init_mids();
1573 if (rc)
1574 goto out_destroy_inodecache;
1575
1576 rc = cifs_init_request_bufs();
1577 if (rc)
1578 goto out_destroy_mids;
1579
1580#ifdef CONFIG_CIFS_DFS_UPCALL
1581 rc = dfs_cache_init();
1582 if (rc)
1583 goto out_destroy_request_bufs;
1584#endif /* CONFIG_CIFS_DFS_UPCALL */
1585#ifdef CONFIG_CIFS_UPCALL
1586 rc = init_cifs_spnego();
1587 if (rc)
1588 goto out_destroy_dfs_cache;
1589#endif /* CONFIG_CIFS_UPCALL */
1590
1591 rc = init_cifs_idmap();
1592 if (rc)
1593 goto out_register_key_type;
1594
1595 rc = register_filesystem(&cifs_fs_type);
1596 if (rc)
1597 goto out_init_cifs_idmap;
1598
1599 rc = register_filesystem(&smb3_fs_type);
1600 if (rc) {
1601 unregister_filesystem(&cifs_fs_type);
1602 goto out_init_cifs_idmap;
1603 }
1604
1605 return 0;
1606
1607out_init_cifs_idmap:
1608 exit_cifs_idmap();
1609out_register_key_type:
1610#ifdef CONFIG_CIFS_UPCALL
1611 exit_cifs_spnego();
1612out_destroy_dfs_cache:
1613#endif
1614#ifdef CONFIG_CIFS_DFS_UPCALL
1615 dfs_cache_destroy();
1616out_destroy_request_bufs:
1617#endif
1618 cifs_destroy_request_bufs();
1619out_destroy_mids:
1620 cifs_destroy_mids();
1621out_destroy_inodecache:
1622 cifs_destroy_inodecache();
1623out_unreg_fscache:
1624 cifs_fscache_unregister();
1625out_destroy_cifsoplockd_wq:
1626 destroy_workqueue(cifsoplockd_wq);
1627out_destroy_decrypt_wq:
1628 destroy_workqueue(decrypt_wq);
1629out_destroy_cifsiod_wq:
1630 destroy_workqueue(cifsiod_wq);
1631out_clean_proc:
1632 cifs_proc_clean();
1633 return rc;
1634}
1635
1636static void __exit
1637exit_cifs(void)
1638{
1639 cifs_dbg(NOISY, "exit_smb3\n");
1640 unregister_filesystem(&cifs_fs_type);
1641 unregister_filesystem(&smb3_fs_type);
1642 cifs_dfs_release_automount_timer();
1643 exit_cifs_idmap();
1644#ifdef CONFIG_CIFS_UPCALL
1645 exit_cifs_spnego();
1646#endif
1647#ifdef CONFIG_CIFS_DFS_UPCALL
1648 dfs_cache_destroy();
1649#endif
1650 cifs_destroy_request_bufs();
1651 cifs_destroy_mids();
1652 cifs_destroy_inodecache();
1653 cifs_fscache_unregister();
1654 destroy_workqueue(cifsoplockd_wq);
1655 destroy_workqueue(decrypt_wq);
1656 destroy_workqueue(cifsiod_wq);
1657 cifs_proc_clean();
1658}
1659
1660MODULE_AUTHOR("Steve French");
1661MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1662MODULE_DESCRIPTION
1663 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1664 "also older servers complying with the SNIA CIFS Specification)");
1665MODULE_VERSION(CIFS_VERSION);
1666MODULE_SOFTDEP("pre: ecb");
1667MODULE_SOFTDEP("pre: hmac");
1668MODULE_SOFTDEP("pre: md4");
1669MODULE_SOFTDEP("pre: md5");
1670MODULE_SOFTDEP("pre: nls");
1671MODULE_SOFTDEP("pre: aes");
1672MODULE_SOFTDEP("pre: cmac");
1673MODULE_SOFTDEP("pre: sha256");
1674MODULE_SOFTDEP("pre: sha512");
1675MODULE_SOFTDEP("pre: aead2");
1676MODULE_SOFTDEP("pre: ccm");
1677MODULE_SOFTDEP("pre: gcm");
1678module_init(init_cifs)
1679module_exit(exit_cifs)