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1// SPDX-License-Identifier: LGPL-2.1
2/*
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 */
10
11/* Note that BB means BUGBUG (ie something to fix eventually) */
12
13#include <linux/module.h>
14#include <linux/fs.h>
15#include <linux/mount.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/list.h>
19#include <linux/seq_file.h>
20#include <linux/vfs.h>
21#include <linux/mempool.h>
22#include <linux/delay.h>
23#include <linux/kthread.h>
24#include <linux/freezer.h>
25#include <linux/namei.h>
26#include <linux/random.h>
27#include <linux/uuid.h>
28#include <linux/xattr.h>
29#include <uapi/linux/magic.h>
30#include <net/ipv6.h>
31#include "cifsfs.h"
32#include "cifspdu.h"
33#define DECLARE_GLOBALS_HERE
34#include "cifsglob.h"
35#include "cifsproto.h"
36#include "cifs_debug.h"
37#include "cifs_fs_sb.h"
38#include <linux/mm.h>
39#include <linux/key-type.h>
40#include "cifs_spnego.h"
41#include "fscache.h"
42#ifdef CONFIG_CIFS_DFS_UPCALL
43#include "dfs_cache.h"
44#endif
45#ifdef CONFIG_CIFS_SWN_UPCALL
46#include "netlink.h"
47#endif
48#include "fs_context.h"
49#include "cached_dir.h"
50
51/*
52 * DOS dates from 1980/1/1 through 2107/12/31
53 * Protocol specifications indicate the range should be to 119, which
54 * limits maximum year to 2099. But this range has not been checked.
55 */
56#define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
57#define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
58#define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
59
60int cifsFYI = 0;
61bool traceSMB;
62bool enable_oplocks = true;
63bool linuxExtEnabled = true;
64bool lookupCacheEnabled = true;
65bool disable_legacy_dialects; /* false by default */
66bool enable_gcm_256 = true;
67bool require_gcm_256; /* false by default */
68bool enable_negotiate_signing; /* false by default */
69unsigned int global_secflags = CIFSSEC_DEF;
70/* unsigned int ntlmv2_support = 0; */
71unsigned int sign_CIFS_PDUs = 1;
72
73/*
74 * Global transaction id (XID) information
75 */
76unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
77unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
78unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
79spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
80
81/*
82 * Global counters, updated atomically
83 */
84atomic_t sesInfoAllocCount;
85atomic_t tconInfoAllocCount;
86atomic_t tcpSesNextId;
87atomic_t tcpSesAllocCount;
88atomic_t tcpSesReconnectCount;
89atomic_t tconInfoReconnectCount;
90
91atomic_t mid_count;
92atomic_t buf_alloc_count;
93atomic_t small_buf_alloc_count;
94#ifdef CONFIG_CIFS_STATS2
95atomic_t total_buf_alloc_count;
96atomic_t total_small_buf_alloc_count;
97#endif/* STATS2 */
98struct list_head cifs_tcp_ses_list;
99spinlock_t cifs_tcp_ses_lock;
100static const struct super_operations cifs_super_ops;
101unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
102module_param(CIFSMaxBufSize, uint, 0444);
103MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
104 "for CIFS requests. "
105 "Default: 16384 Range: 8192 to 130048");
106unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
107module_param(cifs_min_rcv, uint, 0444);
108MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
109 "1 to 64");
110unsigned int cifs_min_small = 30;
111module_param(cifs_min_small, uint, 0444);
112MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
113 "Range: 2 to 256");
114unsigned int cifs_max_pending = CIFS_MAX_REQ;
115module_param(cifs_max_pending, uint, 0444);
116MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
117 "CIFS/SMB1 dialect (N/A for SMB3) "
118 "Default: 32767 Range: 2 to 32767.");
119#ifdef CONFIG_CIFS_STATS2
120unsigned int slow_rsp_threshold = 1;
121module_param(slow_rsp_threshold, uint, 0644);
122MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
123 "before logging that a response is delayed. "
124 "Default: 1 (if set to 0 disables msg).");
125#endif /* STATS2 */
126
127module_param(enable_oplocks, bool, 0644);
128MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
129
130module_param(enable_gcm_256, bool, 0644);
131MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
132
133module_param(require_gcm_256, bool, 0644);
134MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
135
136module_param(enable_negotiate_signing, bool, 0644);
137MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
138
139module_param(disable_legacy_dialects, bool, 0644);
140MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
141 "helpful to restrict the ability to "
142 "override the default dialects (SMB2.1, "
143 "SMB3 and SMB3.02) on mount with old "
144 "dialects (CIFS/SMB1 and SMB2) since "
145 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
146 " and less secure. Default: n/N/0");
147
148extern mempool_t *cifs_sm_req_poolp;
149extern mempool_t *cifs_req_poolp;
150extern mempool_t *cifs_mid_poolp;
151
152struct workqueue_struct *cifsiod_wq;
153struct workqueue_struct *decrypt_wq;
154struct workqueue_struct *fileinfo_put_wq;
155struct workqueue_struct *cifsoplockd_wq;
156struct workqueue_struct *deferredclose_wq;
157__u32 cifs_lock_secret;
158
159/*
160 * Bumps refcount for cifs super block.
161 * Note that it should be only called if a referece to VFS super block is
162 * already held, e.g. in open-type syscalls context. Otherwise it can race with
163 * atomic_dec_and_test in deactivate_locked_super.
164 */
165void
166cifs_sb_active(struct super_block *sb)
167{
168 struct cifs_sb_info *server = CIFS_SB(sb);
169
170 if (atomic_inc_return(&server->active) == 1)
171 atomic_inc(&sb->s_active);
172}
173
174void
175cifs_sb_deactive(struct super_block *sb)
176{
177 struct cifs_sb_info *server = CIFS_SB(sb);
178
179 if (atomic_dec_and_test(&server->active))
180 deactivate_super(sb);
181}
182
183static int
184cifs_read_super(struct super_block *sb)
185{
186 struct inode *inode;
187 struct cifs_sb_info *cifs_sb;
188 struct cifs_tcon *tcon;
189 struct timespec64 ts;
190 int rc = 0;
191
192 cifs_sb = CIFS_SB(sb);
193 tcon = cifs_sb_master_tcon(cifs_sb);
194
195 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
196 sb->s_flags |= SB_POSIXACL;
197
198 if (tcon->snapshot_time)
199 sb->s_flags |= SB_RDONLY;
200
201 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
202 sb->s_maxbytes = MAX_LFS_FILESIZE;
203 else
204 sb->s_maxbytes = MAX_NON_LFS;
205
206 /*
207 * Some very old servers like DOS and OS/2 used 2 second granularity
208 * (while all current servers use 100ns granularity - see MS-DTYP)
209 * but 1 second is the maximum allowed granularity for the VFS
210 * so for old servers set time granularity to 1 second while for
211 * everything else (current servers) set it to 100ns.
212 */
213 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
214 ((tcon->ses->capabilities &
215 tcon->ses->server->vals->cap_nt_find) == 0) &&
216 !tcon->unix_ext) {
217 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
218 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
219 sb->s_time_min = ts.tv_sec;
220 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
221 cpu_to_le16(SMB_TIME_MAX), 0);
222 sb->s_time_max = ts.tv_sec;
223 } else {
224 /*
225 * Almost every server, including all SMB2+, uses DCE TIME
226 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
227 */
228 sb->s_time_gran = 100;
229 ts = cifs_NTtimeToUnix(0);
230 sb->s_time_min = ts.tv_sec;
231 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
232 sb->s_time_max = ts.tv_sec;
233 }
234
235 sb->s_magic = CIFS_SUPER_MAGIC;
236 sb->s_op = &cifs_super_ops;
237 sb->s_xattr = cifs_xattr_handlers;
238 rc = super_setup_bdi(sb);
239 if (rc)
240 goto out_no_root;
241 /* tune readahead according to rsize if readahead size not set on mount */
242 if (cifs_sb->ctx->rsize == 0)
243 cifs_sb->ctx->rsize =
244 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
245 if (cifs_sb->ctx->rasize)
246 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
247 else
248 sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
249
250 sb->s_blocksize = CIFS_MAX_MSGSIZE;
251 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
252 inode = cifs_root_iget(sb);
253
254 if (IS_ERR(inode)) {
255 rc = PTR_ERR(inode);
256 goto out_no_root;
257 }
258
259 if (tcon->nocase)
260 sb->s_d_op = &cifs_ci_dentry_ops;
261 else
262 sb->s_d_op = &cifs_dentry_ops;
263
264 sb->s_root = d_make_root(inode);
265 if (!sb->s_root) {
266 rc = -ENOMEM;
267 goto out_no_root;
268 }
269
270#ifdef CONFIG_CIFS_NFSD_EXPORT
271 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
272 cifs_dbg(FYI, "export ops supported\n");
273 sb->s_export_op = &cifs_export_ops;
274 }
275#endif /* CONFIG_CIFS_NFSD_EXPORT */
276
277 return 0;
278
279out_no_root:
280 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
281 return rc;
282}
283
284static void cifs_kill_sb(struct super_block *sb)
285{
286 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
287
288 /*
289 * We ned to release all dentries for the cached directories
290 * before we kill the sb.
291 */
292 if (cifs_sb->root) {
293 close_all_cached_dirs(cifs_sb);
294
295 /* finally release root dentry */
296 dput(cifs_sb->root);
297 cifs_sb->root = NULL;
298 }
299
300 kill_anon_super(sb);
301 cifs_umount(cifs_sb);
302}
303
304static int
305cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
306{
307 struct super_block *sb = dentry->d_sb;
308 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
309 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
310 struct TCP_Server_Info *server = tcon->ses->server;
311 unsigned int xid;
312 int rc = 0;
313
314 xid = get_xid();
315
316 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
317 buf->f_namelen =
318 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
319 else
320 buf->f_namelen = PATH_MAX;
321
322 buf->f_fsid.val[0] = tcon->vol_serial_number;
323 /* are using part of create time for more randomness, see man statfs */
324 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
325
326 buf->f_files = 0; /* undefined */
327 buf->f_ffree = 0; /* unlimited */
328
329 if (server->ops->queryfs)
330 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
331
332 free_xid(xid);
333 return rc;
334}
335
336static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
337{
338 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
339 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
340 struct TCP_Server_Info *server = tcon->ses->server;
341
342 if (server->ops->fallocate)
343 return server->ops->fallocate(file, tcon, mode, off, len);
344
345 return -EOPNOTSUPP;
346}
347
348static int cifs_permission(struct user_namespace *mnt_userns,
349 struct inode *inode, int mask)
350{
351 struct cifs_sb_info *cifs_sb;
352
353 cifs_sb = CIFS_SB(inode->i_sb);
354
355 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
356 if ((mask & MAY_EXEC) && !execute_ok(inode))
357 return -EACCES;
358 else
359 return 0;
360 } else /* file mode might have been restricted at mount time
361 on the client (above and beyond ACL on servers) for
362 servers which do not support setting and viewing mode bits,
363 so allowing client to check permissions is useful */
364 return generic_permission(&init_user_ns, inode, mask);
365}
366
367static struct kmem_cache *cifs_inode_cachep;
368static struct kmem_cache *cifs_req_cachep;
369static struct kmem_cache *cifs_mid_cachep;
370static struct kmem_cache *cifs_sm_req_cachep;
371mempool_t *cifs_sm_req_poolp;
372mempool_t *cifs_req_poolp;
373mempool_t *cifs_mid_poolp;
374
375static struct inode *
376cifs_alloc_inode(struct super_block *sb)
377{
378 struct cifsInodeInfo *cifs_inode;
379 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
380 if (!cifs_inode)
381 return NULL;
382 cifs_inode->cifsAttrs = 0x20; /* default */
383 cifs_inode->time = 0;
384 /*
385 * Until the file is open and we have gotten oplock info back from the
386 * server, can not assume caching of file data or metadata.
387 */
388 cifs_set_oplock_level(cifs_inode, 0);
389 cifs_inode->flags = 0;
390 spin_lock_init(&cifs_inode->writers_lock);
391 cifs_inode->writers = 0;
392 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
393 cifs_inode->server_eof = 0;
394 cifs_inode->uniqueid = 0;
395 cifs_inode->createtime = 0;
396 cifs_inode->epoch = 0;
397 spin_lock_init(&cifs_inode->open_file_lock);
398 generate_random_uuid(cifs_inode->lease_key);
399 cifs_inode->symlink_target = NULL;
400
401 /*
402 * Can not set i_flags here - they get immediately overwritten to zero
403 * by the VFS.
404 */
405 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
406 INIT_LIST_HEAD(&cifs_inode->openFileList);
407 INIT_LIST_HEAD(&cifs_inode->llist);
408 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
409 spin_lock_init(&cifs_inode->deferred_lock);
410 return &cifs_inode->netfs.inode;
411}
412
413static void
414cifs_free_inode(struct inode *inode)
415{
416 struct cifsInodeInfo *cinode = CIFS_I(inode);
417
418 if (S_ISLNK(inode->i_mode))
419 kfree(cinode->symlink_target);
420 kmem_cache_free(cifs_inode_cachep, cinode);
421}
422
423static void
424cifs_evict_inode(struct inode *inode)
425{
426 truncate_inode_pages_final(&inode->i_data);
427 if (inode->i_state & I_PINNING_FSCACHE_WB)
428 cifs_fscache_unuse_inode_cookie(inode, true);
429 cifs_fscache_release_inode_cookie(inode);
430 clear_inode(inode);
431}
432
433static void
434cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
435{
436 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
437 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
438
439 seq_puts(s, ",addr=");
440
441 switch (server->dstaddr.ss_family) {
442 case AF_INET:
443 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
444 break;
445 case AF_INET6:
446 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
447 if (sa6->sin6_scope_id)
448 seq_printf(s, "%%%u", sa6->sin6_scope_id);
449 break;
450 default:
451 seq_puts(s, "(unknown)");
452 }
453 if (server->rdma)
454 seq_puts(s, ",rdma");
455}
456
457static void
458cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
459{
460 if (ses->sectype == Unspecified) {
461 if (ses->user_name == NULL)
462 seq_puts(s, ",sec=none");
463 return;
464 }
465
466 seq_puts(s, ",sec=");
467
468 switch (ses->sectype) {
469 case NTLMv2:
470 seq_puts(s, "ntlmv2");
471 break;
472 case Kerberos:
473 seq_puts(s, "krb5");
474 break;
475 case RawNTLMSSP:
476 seq_puts(s, "ntlmssp");
477 break;
478 default:
479 /* shouldn't ever happen */
480 seq_puts(s, "unknown");
481 break;
482 }
483
484 if (ses->sign)
485 seq_puts(s, "i");
486
487 if (ses->sectype == Kerberos)
488 seq_printf(s, ",cruid=%u",
489 from_kuid_munged(&init_user_ns, ses->cred_uid));
490}
491
492static void
493cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
494{
495 seq_puts(s, ",cache=");
496
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
498 seq_puts(s, "strict");
499 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
500 seq_puts(s, "none");
501 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
502 seq_puts(s, "singleclient"); /* assume only one client access */
503 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
504 seq_puts(s, "ro"); /* read only caching assumed */
505 else
506 seq_puts(s, "loose");
507}
508
509/*
510 * cifs_show_devname() is used so we show the mount device name with correct
511 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
512 */
513static int cifs_show_devname(struct seq_file *m, struct dentry *root)
514{
515 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
516 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
517
518 if (devname == NULL)
519 seq_puts(m, "none");
520 else {
521 convert_delimiter(devname, '/');
522 /* escape all spaces in share names */
523 seq_escape(m, devname, " \t");
524 kfree(devname);
525 }
526 return 0;
527}
528
529/*
530 * cifs_show_options() is for displaying mount options in /proc/mounts.
531 * Not all settable options are displayed but most of the important
532 * ones are.
533 */
534static int
535cifs_show_options(struct seq_file *s, struct dentry *root)
536{
537 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
538 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
539 struct sockaddr *srcaddr;
540 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
541
542 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
543 cifs_show_security(s, tcon->ses);
544 cifs_show_cache_flavor(s, cifs_sb);
545
546 if (tcon->no_lease)
547 seq_puts(s, ",nolease");
548 if (cifs_sb->ctx->multiuser)
549 seq_puts(s, ",multiuser");
550 else if (tcon->ses->user_name)
551 seq_show_option(s, "username", tcon->ses->user_name);
552
553 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
554 seq_show_option(s, "domain", tcon->ses->domainName);
555
556 if (srcaddr->sa_family != AF_UNSPEC) {
557 struct sockaddr_in *saddr4;
558 struct sockaddr_in6 *saddr6;
559 saddr4 = (struct sockaddr_in *)srcaddr;
560 saddr6 = (struct sockaddr_in6 *)srcaddr;
561 if (srcaddr->sa_family == AF_INET6)
562 seq_printf(s, ",srcaddr=%pI6c",
563 &saddr6->sin6_addr);
564 else if (srcaddr->sa_family == AF_INET)
565 seq_printf(s, ",srcaddr=%pI4",
566 &saddr4->sin_addr.s_addr);
567 else
568 seq_printf(s, ",srcaddr=BAD-AF:%i",
569 (int)(srcaddr->sa_family));
570 }
571
572 seq_printf(s, ",uid=%u",
573 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
575 seq_puts(s, ",forceuid");
576 else
577 seq_puts(s, ",noforceuid");
578
579 seq_printf(s, ",gid=%u",
580 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
581 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
582 seq_puts(s, ",forcegid");
583 else
584 seq_puts(s, ",noforcegid");
585
586 cifs_show_address(s, tcon->ses->server);
587
588 if (!tcon->unix_ext)
589 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
590 cifs_sb->ctx->file_mode,
591 cifs_sb->ctx->dir_mode);
592 if (cifs_sb->ctx->iocharset)
593 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
594 if (tcon->seal)
595 seq_puts(s, ",seal");
596 else if (tcon->ses->server->ignore_signature)
597 seq_puts(s, ",signloosely");
598 if (tcon->nocase)
599 seq_puts(s, ",nocase");
600 if (tcon->nodelete)
601 seq_puts(s, ",nodelete");
602 if (cifs_sb->ctx->no_sparse)
603 seq_puts(s, ",nosparse");
604 if (tcon->local_lease)
605 seq_puts(s, ",locallease");
606 if (tcon->retry)
607 seq_puts(s, ",hard");
608 else
609 seq_puts(s, ",soft");
610 if (tcon->use_persistent)
611 seq_puts(s, ",persistenthandles");
612 else if (tcon->use_resilient)
613 seq_puts(s, ",resilienthandles");
614 if (tcon->posix_extensions)
615 seq_puts(s, ",posix");
616 else if (tcon->unix_ext)
617 seq_puts(s, ",unix");
618 else
619 seq_puts(s, ",nounix");
620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
621 seq_puts(s, ",nodfs");
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
623 seq_puts(s, ",posixpaths");
624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
625 seq_puts(s, ",setuids");
626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
627 seq_puts(s, ",idsfromsid");
628 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
629 seq_puts(s, ",serverino");
630 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
631 seq_puts(s, ",rwpidforward");
632 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
633 seq_puts(s, ",forcemand");
634 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
635 seq_puts(s, ",nouser_xattr");
636 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
637 seq_puts(s, ",mapchars");
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
639 seq_puts(s, ",mapposix");
640 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
641 seq_puts(s, ",sfu");
642 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
643 seq_puts(s, ",nobrl");
644 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
645 seq_puts(s, ",nohandlecache");
646 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
647 seq_puts(s, ",modefromsid");
648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
649 seq_puts(s, ",cifsacl");
650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
651 seq_puts(s, ",dynperm");
652 if (root->d_sb->s_flags & SB_POSIXACL)
653 seq_puts(s, ",acl");
654 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
655 seq_puts(s, ",mfsymlinks");
656 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
657 seq_puts(s, ",fsc");
658 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
659 seq_puts(s, ",nostrictsync");
660 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
661 seq_puts(s, ",noperm");
662 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
663 seq_printf(s, ",backupuid=%u",
664 from_kuid_munged(&init_user_ns,
665 cifs_sb->ctx->backupuid));
666 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
667 seq_printf(s, ",backupgid=%u",
668 from_kgid_munged(&init_user_ns,
669 cifs_sb->ctx->backupgid));
670
671 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
672 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
673 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
674 if (cifs_sb->ctx->rasize)
675 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
676 if (tcon->ses->server->min_offload)
677 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
678 seq_printf(s, ",echo_interval=%lu",
679 tcon->ses->server->echo_interval / HZ);
680
681 /* Only display the following if overridden on mount */
682 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
683 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
684 if (tcon->ses->server->tcp_nodelay)
685 seq_puts(s, ",tcpnodelay");
686 if (tcon->ses->server->noautotune)
687 seq_puts(s, ",noautotune");
688 if (tcon->ses->server->noblocksnd)
689 seq_puts(s, ",noblocksend");
690
691 if (tcon->snapshot_time)
692 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
693 if (tcon->handle_timeout)
694 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
695
696 /*
697 * Display file and directory attribute timeout in seconds.
698 * If file and directory attribute timeout the same then actimeo
699 * was likely specified on mount
700 */
701 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
702 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
703 else {
704 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
705 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
706 }
707 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
708
709 if (tcon->ses->chan_max > 1)
710 seq_printf(s, ",multichannel,max_channels=%zu",
711 tcon->ses->chan_max);
712
713 if (tcon->use_witness)
714 seq_puts(s, ",witness");
715
716 return 0;
717}
718
719static void cifs_umount_begin(struct super_block *sb)
720{
721 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
722 struct cifs_tcon *tcon;
723
724 if (cifs_sb == NULL)
725 return;
726
727 tcon = cifs_sb_master_tcon(cifs_sb);
728
729 spin_lock(&cifs_tcp_ses_lock);
730 spin_lock(&tcon->tc_lock);
731 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
732 /* we have other mounts to same share or we have
733 already tried to force umount this and woken up
734 all waiting network requests, nothing to do */
735 spin_unlock(&tcon->tc_lock);
736 spin_unlock(&cifs_tcp_ses_lock);
737 return;
738 } else if (tcon->tc_count == 1)
739 tcon->status = TID_EXITING;
740 spin_unlock(&tcon->tc_lock);
741 spin_unlock(&cifs_tcp_ses_lock);
742
743 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
744 /* cancel_notify_requests(tcon); */
745 if (tcon->ses && tcon->ses->server) {
746 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
747 wake_up_all(&tcon->ses->server->request_q);
748 wake_up_all(&tcon->ses->server->response_q);
749 msleep(1); /* yield */
750 /* we have to kick the requests once more */
751 wake_up_all(&tcon->ses->server->response_q);
752 msleep(1);
753 }
754
755 return;
756}
757
758#ifdef CONFIG_CIFS_STATS2
759static int cifs_show_stats(struct seq_file *s, struct dentry *root)
760{
761 /* BB FIXME */
762 return 0;
763}
764#endif
765
766static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
767{
768 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
769 return 0;
770}
771
772static int cifs_drop_inode(struct inode *inode)
773{
774 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
775
776 /* no serverino => unconditional eviction */
777 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
778 generic_drop_inode(inode);
779}
780
781static const struct super_operations cifs_super_ops = {
782 .statfs = cifs_statfs,
783 .alloc_inode = cifs_alloc_inode,
784 .write_inode = cifs_write_inode,
785 .free_inode = cifs_free_inode,
786 .drop_inode = cifs_drop_inode,
787 .evict_inode = cifs_evict_inode,
788/* .show_path = cifs_show_path, */ /* Would we ever need show path? */
789 .show_devname = cifs_show_devname,
790/* .delete_inode = cifs_delete_inode, */ /* Do not need above
791 function unless later we add lazy close of inodes or unless the
792 kernel forgets to call us with the same number of releases (closes)
793 as opens */
794 .show_options = cifs_show_options,
795 .umount_begin = cifs_umount_begin,
796#ifdef CONFIG_CIFS_STATS2
797 .show_stats = cifs_show_stats,
798#endif
799};
800
801/*
802 * Get root dentry from superblock according to prefix path mount option.
803 * Return dentry with refcount + 1 on success and NULL otherwise.
804 */
805static struct dentry *
806cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
807{
808 struct dentry *dentry;
809 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
810 char *full_path = NULL;
811 char *s, *p;
812 char sep;
813
814 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
815 return dget(sb->s_root);
816
817 full_path = cifs_build_path_to_root(ctx, cifs_sb,
818 cifs_sb_master_tcon(cifs_sb), 0);
819 if (full_path == NULL)
820 return ERR_PTR(-ENOMEM);
821
822 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
823
824 sep = CIFS_DIR_SEP(cifs_sb);
825 dentry = dget(sb->s_root);
826 s = full_path;
827
828 do {
829 struct inode *dir = d_inode(dentry);
830 struct dentry *child;
831
832 if (!S_ISDIR(dir->i_mode)) {
833 dput(dentry);
834 dentry = ERR_PTR(-ENOTDIR);
835 break;
836 }
837
838 /* skip separators */
839 while (*s == sep)
840 s++;
841 if (!*s)
842 break;
843 p = s++;
844 /* next separator */
845 while (*s && *s != sep)
846 s++;
847
848 child = lookup_positive_unlocked(p, dentry, s - p);
849 dput(dentry);
850 dentry = child;
851 } while (!IS_ERR(dentry));
852 kfree(full_path);
853 return dentry;
854}
855
856static int cifs_set_super(struct super_block *sb, void *data)
857{
858 struct cifs_mnt_data *mnt_data = data;
859 sb->s_fs_info = mnt_data->cifs_sb;
860 return set_anon_super(sb, NULL);
861}
862
863struct dentry *
864cifs_smb3_do_mount(struct file_system_type *fs_type,
865 int flags, struct smb3_fs_context *old_ctx)
866{
867 int rc;
868 struct super_block *sb = NULL;
869 struct cifs_sb_info *cifs_sb = NULL;
870 struct cifs_mnt_data mnt_data;
871 struct dentry *root;
872
873 /*
874 * Prints in Kernel / CIFS log the attempted mount operation
875 * If CIFS_DEBUG && cifs_FYI
876 */
877 if (cifsFYI)
878 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
879 else
880 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
881
882 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
883 if (cifs_sb == NULL) {
884 root = ERR_PTR(-ENOMEM);
885 goto out;
886 }
887
888 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
889 if (!cifs_sb->ctx) {
890 root = ERR_PTR(-ENOMEM);
891 goto out;
892 }
893 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
894 if (rc) {
895 root = ERR_PTR(rc);
896 goto out;
897 }
898
899 rc = cifs_setup_cifs_sb(cifs_sb);
900 if (rc) {
901 root = ERR_PTR(rc);
902 goto out;
903 }
904
905 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
906 if (rc) {
907 if (!(flags & SB_SILENT))
908 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
909 rc);
910 root = ERR_PTR(rc);
911 goto out;
912 }
913
914 mnt_data.ctx = cifs_sb->ctx;
915 mnt_data.cifs_sb = cifs_sb;
916 mnt_data.flags = flags;
917
918 /* BB should we make this contingent on mount parm? */
919 flags |= SB_NODIRATIME | SB_NOATIME;
920
921 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
922 if (IS_ERR(sb)) {
923 root = ERR_CAST(sb);
924 cifs_umount(cifs_sb);
925 cifs_sb = NULL;
926 goto out;
927 }
928
929 if (sb->s_root) {
930 cifs_dbg(FYI, "Use existing superblock\n");
931 cifs_umount(cifs_sb);
932 cifs_sb = NULL;
933 } else {
934 rc = cifs_read_super(sb);
935 if (rc) {
936 root = ERR_PTR(rc);
937 goto out_super;
938 }
939
940 sb->s_flags |= SB_ACTIVE;
941 }
942
943 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
944 if (IS_ERR(root))
945 goto out_super;
946
947 if (cifs_sb)
948 cifs_sb->root = dget(root);
949
950 cifs_dbg(FYI, "dentry root is: %p\n", root);
951 return root;
952
953out_super:
954 deactivate_locked_super(sb);
955 return root;
956out:
957 if (cifs_sb) {
958 if (!sb || IS_ERR(sb)) { /* otherwise kill_sb will handle */
959 kfree(cifs_sb->prepath);
960 smb3_cleanup_fs_context(cifs_sb->ctx);
961 kfree(cifs_sb);
962 }
963 }
964 return root;
965}
966
967
968static ssize_t
969cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
970{
971 ssize_t rc;
972 struct inode *inode = file_inode(iocb->ki_filp);
973
974 if (iocb->ki_flags & IOCB_DIRECT)
975 return cifs_user_readv(iocb, iter);
976
977 rc = cifs_revalidate_mapping(inode);
978 if (rc)
979 return rc;
980
981 return generic_file_read_iter(iocb, iter);
982}
983
984static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
985{
986 struct inode *inode = file_inode(iocb->ki_filp);
987 struct cifsInodeInfo *cinode = CIFS_I(inode);
988 ssize_t written;
989 int rc;
990
991 if (iocb->ki_filp->f_flags & O_DIRECT) {
992 written = cifs_user_writev(iocb, from);
993 if (written > 0 && CIFS_CACHE_READ(cinode)) {
994 cifs_zap_mapping(inode);
995 cifs_dbg(FYI,
996 "Set no oplock for inode=%p after a write operation\n",
997 inode);
998 cinode->oplock = 0;
999 }
1000 return written;
1001 }
1002
1003 written = cifs_get_writer(cinode);
1004 if (written)
1005 return written;
1006
1007 written = generic_file_write_iter(iocb, from);
1008
1009 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
1010 goto out;
1011
1012 rc = filemap_fdatawrite(inode->i_mapping);
1013 if (rc)
1014 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1015 rc, inode);
1016
1017out:
1018 cifs_put_writer(cinode);
1019 return written;
1020}
1021
1022static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1023{
1024 struct cifsFileInfo *cfile = file->private_data;
1025 struct cifs_tcon *tcon;
1026
1027 /*
1028 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1029 * the cached file length
1030 */
1031 if (whence != SEEK_SET && whence != SEEK_CUR) {
1032 int rc;
1033 struct inode *inode = file_inode(file);
1034
1035 /*
1036 * We need to be sure that all dirty pages are written and the
1037 * server has the newest file length.
1038 */
1039 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1040 inode->i_mapping->nrpages != 0) {
1041 rc = filemap_fdatawait(inode->i_mapping);
1042 if (rc) {
1043 mapping_set_error(inode->i_mapping, rc);
1044 return rc;
1045 }
1046 }
1047 /*
1048 * Some applications poll for the file length in this strange
1049 * way so we must seek to end on non-oplocked files by
1050 * setting the revalidate time to zero.
1051 */
1052 CIFS_I(inode)->time = 0;
1053
1054 rc = cifs_revalidate_file_attr(file);
1055 if (rc < 0)
1056 return (loff_t)rc;
1057 }
1058 if (cfile && cfile->tlink) {
1059 tcon = tlink_tcon(cfile->tlink);
1060 if (tcon->ses->server->ops->llseek)
1061 return tcon->ses->server->ops->llseek(file, tcon,
1062 offset, whence);
1063 }
1064 return generic_file_llseek(file, offset, whence);
1065}
1066
1067static int
1068cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1069{
1070 /*
1071 * Note that this is called by vfs setlease with i_lock held to
1072 * protect *lease from going away.
1073 */
1074 struct inode *inode = file_inode(file);
1075 struct cifsFileInfo *cfile = file->private_data;
1076
1077 if (!(S_ISREG(inode->i_mode)))
1078 return -EINVAL;
1079
1080 /* Check if file is oplocked if this is request for new lease */
1081 if (arg == F_UNLCK ||
1082 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1083 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1084 return generic_setlease(file, arg, lease, priv);
1085 else if (tlink_tcon(cfile->tlink)->local_lease &&
1086 !CIFS_CACHE_READ(CIFS_I(inode)))
1087 /*
1088 * If the server claims to support oplock on this file, then we
1089 * still need to check oplock even if the local_lease mount
1090 * option is set, but there are servers which do not support
1091 * oplock for which this mount option may be useful if the user
1092 * knows that the file won't be changed on the server by anyone
1093 * else.
1094 */
1095 return generic_setlease(file, arg, lease, priv);
1096 else
1097 return -EAGAIN;
1098}
1099
1100struct file_system_type cifs_fs_type = {
1101 .owner = THIS_MODULE,
1102 .name = "cifs",
1103 .init_fs_context = smb3_init_fs_context,
1104 .parameters = smb3_fs_parameters,
1105 .kill_sb = cifs_kill_sb,
1106 .fs_flags = FS_RENAME_DOES_D_MOVE,
1107};
1108MODULE_ALIAS_FS("cifs");
1109
1110struct file_system_type smb3_fs_type = {
1111 .owner = THIS_MODULE,
1112 .name = "smb3",
1113 .init_fs_context = smb3_init_fs_context,
1114 .parameters = smb3_fs_parameters,
1115 .kill_sb = cifs_kill_sb,
1116 .fs_flags = FS_RENAME_DOES_D_MOVE,
1117};
1118MODULE_ALIAS_FS("smb3");
1119MODULE_ALIAS("smb3");
1120
1121const struct inode_operations cifs_dir_inode_ops = {
1122 .create = cifs_create,
1123 .atomic_open = cifs_atomic_open,
1124 .lookup = cifs_lookup,
1125 .getattr = cifs_getattr,
1126 .unlink = cifs_unlink,
1127 .link = cifs_hardlink,
1128 .mkdir = cifs_mkdir,
1129 .rmdir = cifs_rmdir,
1130 .rename = cifs_rename2,
1131 .permission = cifs_permission,
1132 .setattr = cifs_setattr,
1133 .symlink = cifs_symlink,
1134 .mknod = cifs_mknod,
1135 .listxattr = cifs_listxattr,
1136 .get_acl = cifs_get_acl,
1137 .set_acl = cifs_set_acl,
1138};
1139
1140const struct inode_operations cifs_file_inode_ops = {
1141 .setattr = cifs_setattr,
1142 .getattr = cifs_getattr,
1143 .permission = cifs_permission,
1144 .listxattr = cifs_listxattr,
1145 .fiemap = cifs_fiemap,
1146 .get_acl = cifs_get_acl,
1147 .set_acl = cifs_set_acl,
1148};
1149
1150const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1151 struct delayed_call *done)
1152{
1153 char *target_path;
1154
1155 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1156 if (!target_path)
1157 return ERR_PTR(-ENOMEM);
1158
1159 spin_lock(&inode->i_lock);
1160 if (likely(CIFS_I(inode)->symlink_target)) {
1161 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1162 } else {
1163 kfree(target_path);
1164 target_path = ERR_PTR(-EOPNOTSUPP);
1165 }
1166 spin_unlock(&inode->i_lock);
1167
1168 if (!IS_ERR(target_path))
1169 set_delayed_call(done, kfree_link, target_path);
1170
1171 return target_path;
1172}
1173
1174const struct inode_operations cifs_symlink_inode_ops = {
1175 .get_link = cifs_get_link,
1176 .permission = cifs_permission,
1177 .listxattr = cifs_listxattr,
1178};
1179
1180static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1181 struct file *dst_file, loff_t destoff, loff_t len,
1182 unsigned int remap_flags)
1183{
1184 struct inode *src_inode = file_inode(src_file);
1185 struct inode *target_inode = file_inode(dst_file);
1186 struct cifsFileInfo *smb_file_src = src_file->private_data;
1187 struct cifsFileInfo *smb_file_target;
1188 struct cifs_tcon *target_tcon;
1189 unsigned int xid;
1190 int rc;
1191
1192 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1193 return -EINVAL;
1194
1195 cifs_dbg(FYI, "clone range\n");
1196
1197 xid = get_xid();
1198
1199 if (!src_file->private_data || !dst_file->private_data) {
1200 rc = -EBADF;
1201 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1202 goto out;
1203 }
1204
1205 smb_file_target = dst_file->private_data;
1206 target_tcon = tlink_tcon(smb_file_target->tlink);
1207
1208 /*
1209 * Note: cifs case is easier than btrfs since server responsible for
1210 * checks for proper open modes and file type and if it wants
1211 * server could even support copy of range where source = target
1212 */
1213 lock_two_nondirectories(target_inode, src_inode);
1214
1215 if (len == 0)
1216 len = src_inode->i_size - off;
1217
1218 cifs_dbg(FYI, "about to flush pages\n");
1219 /* should we flush first and last page first */
1220 truncate_inode_pages_range(&target_inode->i_data, destoff,
1221 PAGE_ALIGN(destoff + len)-1);
1222
1223 if (target_tcon->ses->server->ops->duplicate_extents)
1224 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1225 smb_file_src, smb_file_target, off, len, destoff);
1226 else
1227 rc = -EOPNOTSUPP;
1228
1229 /* force revalidate of size and timestamps of target file now
1230 that target is updated on the server */
1231 CIFS_I(target_inode)->time = 0;
1232 /* although unlocking in the reverse order from locking is not
1233 strictly necessary here it is a little cleaner to be consistent */
1234 unlock_two_nondirectories(src_inode, target_inode);
1235out:
1236 free_xid(xid);
1237 return rc < 0 ? rc : len;
1238}
1239
1240ssize_t cifs_file_copychunk_range(unsigned int xid,
1241 struct file *src_file, loff_t off,
1242 struct file *dst_file, loff_t destoff,
1243 size_t len, unsigned int flags)
1244{
1245 struct inode *src_inode = file_inode(src_file);
1246 struct inode *target_inode = file_inode(dst_file);
1247 struct cifsFileInfo *smb_file_src;
1248 struct cifsFileInfo *smb_file_target;
1249 struct cifs_tcon *src_tcon;
1250 struct cifs_tcon *target_tcon;
1251 ssize_t rc;
1252
1253 cifs_dbg(FYI, "copychunk range\n");
1254
1255 if (!src_file->private_data || !dst_file->private_data) {
1256 rc = -EBADF;
1257 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1258 goto out;
1259 }
1260
1261 rc = -EXDEV;
1262 smb_file_target = dst_file->private_data;
1263 smb_file_src = src_file->private_data;
1264 src_tcon = tlink_tcon(smb_file_src->tlink);
1265 target_tcon = tlink_tcon(smb_file_target->tlink);
1266
1267 if (src_tcon->ses != target_tcon->ses) {
1268 cifs_dbg(VFS, "source and target of copy not on same server\n");
1269 goto out;
1270 }
1271
1272 rc = -EOPNOTSUPP;
1273 if (!target_tcon->ses->server->ops->copychunk_range)
1274 goto out;
1275
1276 /*
1277 * Note: cifs case is easier than btrfs since server responsible for
1278 * checks for proper open modes and file type and if it wants
1279 * server could even support copy of range where source = target
1280 */
1281 lock_two_nondirectories(target_inode, src_inode);
1282
1283 cifs_dbg(FYI, "about to flush pages\n");
1284
1285 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1286 off + len - 1);
1287 if (rc)
1288 goto unlock;
1289
1290 /* should we flush first and last page first */
1291 truncate_inode_pages(&target_inode->i_data, 0);
1292
1293 rc = file_modified(dst_file);
1294 if (!rc)
1295 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1296 smb_file_src, smb_file_target, off, len, destoff);
1297
1298 file_accessed(src_file);
1299
1300 /* force revalidate of size and timestamps of target file now
1301 * that target is updated on the server
1302 */
1303 CIFS_I(target_inode)->time = 0;
1304
1305unlock:
1306 /* although unlocking in the reverse order from locking is not
1307 * strictly necessary here it is a little cleaner to be consistent
1308 */
1309 unlock_two_nondirectories(src_inode, target_inode);
1310
1311out:
1312 return rc;
1313}
1314
1315/*
1316 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1317 * is a dummy operation.
1318 */
1319static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1320{
1321 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1322 file, datasync);
1323
1324 return 0;
1325}
1326
1327static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1328 struct file *dst_file, loff_t destoff,
1329 size_t len, unsigned int flags)
1330{
1331 unsigned int xid = get_xid();
1332 ssize_t rc;
1333 struct cifsFileInfo *cfile = dst_file->private_data;
1334
1335 if (cfile->swapfile) {
1336 rc = -EOPNOTSUPP;
1337 free_xid(xid);
1338 return rc;
1339 }
1340
1341 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1342 len, flags);
1343 free_xid(xid);
1344
1345 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1346 rc = generic_copy_file_range(src_file, off, dst_file,
1347 destoff, len, flags);
1348 return rc;
1349}
1350
1351const struct file_operations cifs_file_ops = {
1352 .read_iter = cifs_loose_read_iter,
1353 .write_iter = cifs_file_write_iter,
1354 .open = cifs_open,
1355 .release = cifs_close,
1356 .lock = cifs_lock,
1357 .flock = cifs_flock,
1358 .fsync = cifs_fsync,
1359 .flush = cifs_flush,
1360 .mmap = cifs_file_mmap,
1361 .splice_read = generic_file_splice_read,
1362 .splice_write = iter_file_splice_write,
1363 .llseek = cifs_llseek,
1364 .unlocked_ioctl = cifs_ioctl,
1365 .copy_file_range = cifs_copy_file_range,
1366 .remap_file_range = cifs_remap_file_range,
1367 .setlease = cifs_setlease,
1368 .fallocate = cifs_fallocate,
1369};
1370
1371const struct file_operations cifs_file_strict_ops = {
1372 .read_iter = cifs_strict_readv,
1373 .write_iter = cifs_strict_writev,
1374 .open = cifs_open,
1375 .release = cifs_close,
1376 .lock = cifs_lock,
1377 .flock = cifs_flock,
1378 .fsync = cifs_strict_fsync,
1379 .flush = cifs_flush,
1380 .mmap = cifs_file_strict_mmap,
1381 .splice_read = generic_file_splice_read,
1382 .splice_write = iter_file_splice_write,
1383 .llseek = cifs_llseek,
1384 .unlocked_ioctl = cifs_ioctl,
1385 .copy_file_range = cifs_copy_file_range,
1386 .remap_file_range = cifs_remap_file_range,
1387 .setlease = cifs_setlease,
1388 .fallocate = cifs_fallocate,
1389};
1390
1391const struct file_operations cifs_file_direct_ops = {
1392 .read_iter = cifs_direct_readv,
1393 .write_iter = cifs_direct_writev,
1394 .open = cifs_open,
1395 .release = cifs_close,
1396 .lock = cifs_lock,
1397 .flock = cifs_flock,
1398 .fsync = cifs_fsync,
1399 .flush = cifs_flush,
1400 .mmap = cifs_file_mmap,
1401 .splice_read = generic_file_splice_read,
1402 .splice_write = iter_file_splice_write,
1403 .unlocked_ioctl = cifs_ioctl,
1404 .copy_file_range = cifs_copy_file_range,
1405 .remap_file_range = cifs_remap_file_range,
1406 .llseek = cifs_llseek,
1407 .setlease = cifs_setlease,
1408 .fallocate = cifs_fallocate,
1409};
1410
1411const struct file_operations cifs_file_nobrl_ops = {
1412 .read_iter = cifs_loose_read_iter,
1413 .write_iter = cifs_file_write_iter,
1414 .open = cifs_open,
1415 .release = cifs_close,
1416 .fsync = cifs_fsync,
1417 .flush = cifs_flush,
1418 .mmap = cifs_file_mmap,
1419 .splice_read = generic_file_splice_read,
1420 .splice_write = iter_file_splice_write,
1421 .llseek = cifs_llseek,
1422 .unlocked_ioctl = cifs_ioctl,
1423 .copy_file_range = cifs_copy_file_range,
1424 .remap_file_range = cifs_remap_file_range,
1425 .setlease = cifs_setlease,
1426 .fallocate = cifs_fallocate,
1427};
1428
1429const struct file_operations cifs_file_strict_nobrl_ops = {
1430 .read_iter = cifs_strict_readv,
1431 .write_iter = cifs_strict_writev,
1432 .open = cifs_open,
1433 .release = cifs_close,
1434 .fsync = cifs_strict_fsync,
1435 .flush = cifs_flush,
1436 .mmap = cifs_file_strict_mmap,
1437 .splice_read = generic_file_splice_read,
1438 .splice_write = iter_file_splice_write,
1439 .llseek = cifs_llseek,
1440 .unlocked_ioctl = cifs_ioctl,
1441 .copy_file_range = cifs_copy_file_range,
1442 .remap_file_range = cifs_remap_file_range,
1443 .setlease = cifs_setlease,
1444 .fallocate = cifs_fallocate,
1445};
1446
1447const struct file_operations cifs_file_direct_nobrl_ops = {
1448 .read_iter = cifs_direct_readv,
1449 .write_iter = cifs_direct_writev,
1450 .open = cifs_open,
1451 .release = cifs_close,
1452 .fsync = cifs_fsync,
1453 .flush = cifs_flush,
1454 .mmap = cifs_file_mmap,
1455 .splice_read = generic_file_splice_read,
1456 .splice_write = iter_file_splice_write,
1457 .unlocked_ioctl = cifs_ioctl,
1458 .copy_file_range = cifs_copy_file_range,
1459 .remap_file_range = cifs_remap_file_range,
1460 .llseek = cifs_llseek,
1461 .setlease = cifs_setlease,
1462 .fallocate = cifs_fallocate,
1463};
1464
1465const struct file_operations cifs_dir_ops = {
1466 .iterate_shared = cifs_readdir,
1467 .release = cifs_closedir,
1468 .read = generic_read_dir,
1469 .unlocked_ioctl = cifs_ioctl,
1470 .copy_file_range = cifs_copy_file_range,
1471 .remap_file_range = cifs_remap_file_range,
1472 .llseek = generic_file_llseek,
1473 .fsync = cifs_dir_fsync,
1474};
1475
1476static void
1477cifs_init_once(void *inode)
1478{
1479 struct cifsInodeInfo *cifsi = inode;
1480
1481 inode_init_once(&cifsi->netfs.inode);
1482 init_rwsem(&cifsi->lock_sem);
1483}
1484
1485static int __init
1486cifs_init_inodecache(void)
1487{
1488 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1489 sizeof(struct cifsInodeInfo),
1490 0, (SLAB_RECLAIM_ACCOUNT|
1491 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1492 cifs_init_once);
1493 if (cifs_inode_cachep == NULL)
1494 return -ENOMEM;
1495
1496 return 0;
1497}
1498
1499static void
1500cifs_destroy_inodecache(void)
1501{
1502 /*
1503 * Make sure all delayed rcu free inodes are flushed before we
1504 * destroy cache.
1505 */
1506 rcu_barrier();
1507 kmem_cache_destroy(cifs_inode_cachep);
1508}
1509
1510static int
1511cifs_init_request_bufs(void)
1512{
1513 /*
1514 * SMB2 maximum header size is bigger than CIFS one - no problems to
1515 * allocate some more bytes for CIFS.
1516 */
1517 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1518
1519 if (CIFSMaxBufSize < 8192) {
1520 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1521 Unicode path name has to fit in any SMB/CIFS path based frames */
1522 CIFSMaxBufSize = 8192;
1523 } else if (CIFSMaxBufSize > 1024*127) {
1524 CIFSMaxBufSize = 1024 * 127;
1525 } else {
1526 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1527 }
1528/*
1529 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1530 CIFSMaxBufSize, CIFSMaxBufSize);
1531*/
1532 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1533 CIFSMaxBufSize + max_hdr_size, 0,
1534 SLAB_HWCACHE_ALIGN, 0,
1535 CIFSMaxBufSize + max_hdr_size,
1536 NULL);
1537 if (cifs_req_cachep == NULL)
1538 return -ENOMEM;
1539
1540 if (cifs_min_rcv < 1)
1541 cifs_min_rcv = 1;
1542 else if (cifs_min_rcv > 64) {
1543 cifs_min_rcv = 64;
1544 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1545 }
1546
1547 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1548 cifs_req_cachep);
1549
1550 if (cifs_req_poolp == NULL) {
1551 kmem_cache_destroy(cifs_req_cachep);
1552 return -ENOMEM;
1553 }
1554 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1555 almost all handle based requests (but not write response, nor is it
1556 sufficient for path based requests). A smaller size would have
1557 been more efficient (compacting multiple slab items on one 4k page)
1558 for the case in which debug was on, but this larger size allows
1559 more SMBs to use small buffer alloc and is still much more
1560 efficient to alloc 1 per page off the slab compared to 17K (5page)
1561 alloc of large cifs buffers even when page debugging is on */
1562 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1563 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1564 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1565 if (cifs_sm_req_cachep == NULL) {
1566 mempool_destroy(cifs_req_poolp);
1567 kmem_cache_destroy(cifs_req_cachep);
1568 return -ENOMEM;
1569 }
1570
1571 if (cifs_min_small < 2)
1572 cifs_min_small = 2;
1573 else if (cifs_min_small > 256) {
1574 cifs_min_small = 256;
1575 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1576 }
1577
1578 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1579 cifs_sm_req_cachep);
1580
1581 if (cifs_sm_req_poolp == NULL) {
1582 mempool_destroy(cifs_req_poolp);
1583 kmem_cache_destroy(cifs_req_cachep);
1584 kmem_cache_destroy(cifs_sm_req_cachep);
1585 return -ENOMEM;
1586 }
1587
1588 return 0;
1589}
1590
1591static void
1592cifs_destroy_request_bufs(void)
1593{
1594 mempool_destroy(cifs_req_poolp);
1595 kmem_cache_destroy(cifs_req_cachep);
1596 mempool_destroy(cifs_sm_req_poolp);
1597 kmem_cache_destroy(cifs_sm_req_cachep);
1598}
1599
1600static int init_mids(void)
1601{
1602 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1603 sizeof(struct mid_q_entry), 0,
1604 SLAB_HWCACHE_ALIGN, NULL);
1605 if (cifs_mid_cachep == NULL)
1606 return -ENOMEM;
1607
1608 /* 3 is a reasonable minimum number of simultaneous operations */
1609 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1610 if (cifs_mid_poolp == NULL) {
1611 kmem_cache_destroy(cifs_mid_cachep);
1612 return -ENOMEM;
1613 }
1614
1615 return 0;
1616}
1617
1618static void destroy_mids(void)
1619{
1620 mempool_destroy(cifs_mid_poolp);
1621 kmem_cache_destroy(cifs_mid_cachep);
1622}
1623
1624static int __init
1625init_cifs(void)
1626{
1627 int rc = 0;
1628 cifs_proc_init();
1629 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1630/*
1631 * Initialize Global counters
1632 */
1633 atomic_set(&sesInfoAllocCount, 0);
1634 atomic_set(&tconInfoAllocCount, 0);
1635 atomic_set(&tcpSesNextId, 0);
1636 atomic_set(&tcpSesAllocCount, 0);
1637 atomic_set(&tcpSesReconnectCount, 0);
1638 atomic_set(&tconInfoReconnectCount, 0);
1639
1640 atomic_set(&buf_alloc_count, 0);
1641 atomic_set(&small_buf_alloc_count, 0);
1642#ifdef CONFIG_CIFS_STATS2
1643 atomic_set(&total_buf_alloc_count, 0);
1644 atomic_set(&total_small_buf_alloc_count, 0);
1645 if (slow_rsp_threshold < 1)
1646 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1647 else if (slow_rsp_threshold > 32767)
1648 cifs_dbg(VFS,
1649 "slow response threshold set higher than recommended (0 to 32767)\n");
1650#endif /* CONFIG_CIFS_STATS2 */
1651
1652 atomic_set(&mid_count, 0);
1653 GlobalCurrentXid = 0;
1654 GlobalTotalActiveXid = 0;
1655 GlobalMaxActiveXid = 0;
1656 spin_lock_init(&cifs_tcp_ses_lock);
1657 spin_lock_init(&GlobalMid_Lock);
1658
1659 cifs_lock_secret = get_random_u32();
1660
1661 if (cifs_max_pending < 2) {
1662 cifs_max_pending = 2;
1663 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1664 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1665 cifs_max_pending = CIFS_MAX_REQ;
1666 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1667 CIFS_MAX_REQ);
1668 }
1669
1670 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1671 if (!cifsiod_wq) {
1672 rc = -ENOMEM;
1673 goto out_clean_proc;
1674 }
1675
1676 /*
1677 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1678 * so that we don't launch too many worker threads but
1679 * Documentation/core-api/workqueue.rst recommends setting it to 0
1680 */
1681
1682 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1683 decrypt_wq = alloc_workqueue("smb3decryptd",
1684 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1685 if (!decrypt_wq) {
1686 rc = -ENOMEM;
1687 goto out_destroy_cifsiod_wq;
1688 }
1689
1690 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1691 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1692 if (!fileinfo_put_wq) {
1693 rc = -ENOMEM;
1694 goto out_destroy_decrypt_wq;
1695 }
1696
1697 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1698 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1699 if (!cifsoplockd_wq) {
1700 rc = -ENOMEM;
1701 goto out_destroy_fileinfo_put_wq;
1702 }
1703
1704 deferredclose_wq = alloc_workqueue("deferredclose",
1705 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1706 if (!deferredclose_wq) {
1707 rc = -ENOMEM;
1708 goto out_destroy_cifsoplockd_wq;
1709 }
1710
1711 rc = cifs_init_inodecache();
1712 if (rc)
1713 goto out_destroy_deferredclose_wq;
1714
1715 rc = init_mids();
1716 if (rc)
1717 goto out_destroy_inodecache;
1718
1719 rc = cifs_init_request_bufs();
1720 if (rc)
1721 goto out_destroy_mids;
1722
1723#ifdef CONFIG_CIFS_DFS_UPCALL
1724 rc = dfs_cache_init();
1725 if (rc)
1726 goto out_destroy_request_bufs;
1727#endif /* CONFIG_CIFS_DFS_UPCALL */
1728#ifdef CONFIG_CIFS_UPCALL
1729 rc = init_cifs_spnego();
1730 if (rc)
1731 goto out_destroy_dfs_cache;
1732#endif /* CONFIG_CIFS_UPCALL */
1733#ifdef CONFIG_CIFS_SWN_UPCALL
1734 rc = cifs_genl_init();
1735 if (rc)
1736 goto out_register_key_type;
1737#endif /* CONFIG_CIFS_SWN_UPCALL */
1738
1739 rc = init_cifs_idmap();
1740 if (rc)
1741 goto out_cifs_swn_init;
1742
1743 rc = register_filesystem(&cifs_fs_type);
1744 if (rc)
1745 goto out_init_cifs_idmap;
1746
1747 rc = register_filesystem(&smb3_fs_type);
1748 if (rc) {
1749 unregister_filesystem(&cifs_fs_type);
1750 goto out_init_cifs_idmap;
1751 }
1752
1753 return 0;
1754
1755out_init_cifs_idmap:
1756 exit_cifs_idmap();
1757out_cifs_swn_init:
1758#ifdef CONFIG_CIFS_SWN_UPCALL
1759 cifs_genl_exit();
1760out_register_key_type:
1761#endif
1762#ifdef CONFIG_CIFS_UPCALL
1763 exit_cifs_spnego();
1764out_destroy_dfs_cache:
1765#endif
1766#ifdef CONFIG_CIFS_DFS_UPCALL
1767 dfs_cache_destroy();
1768out_destroy_request_bufs:
1769#endif
1770 cifs_destroy_request_bufs();
1771out_destroy_mids:
1772 destroy_mids();
1773out_destroy_inodecache:
1774 cifs_destroy_inodecache();
1775out_destroy_deferredclose_wq:
1776 destroy_workqueue(deferredclose_wq);
1777out_destroy_cifsoplockd_wq:
1778 destroy_workqueue(cifsoplockd_wq);
1779out_destroy_fileinfo_put_wq:
1780 destroy_workqueue(fileinfo_put_wq);
1781out_destroy_decrypt_wq:
1782 destroy_workqueue(decrypt_wq);
1783out_destroy_cifsiod_wq:
1784 destroy_workqueue(cifsiod_wq);
1785out_clean_proc:
1786 cifs_proc_clean();
1787 return rc;
1788}
1789
1790static void __exit
1791exit_cifs(void)
1792{
1793 cifs_dbg(NOISY, "exit_smb3\n");
1794 unregister_filesystem(&cifs_fs_type);
1795 unregister_filesystem(&smb3_fs_type);
1796 cifs_dfs_release_automount_timer();
1797 exit_cifs_idmap();
1798#ifdef CONFIG_CIFS_SWN_UPCALL
1799 cifs_genl_exit();
1800#endif
1801#ifdef CONFIG_CIFS_UPCALL
1802 exit_cifs_spnego();
1803#endif
1804#ifdef CONFIG_CIFS_DFS_UPCALL
1805 dfs_cache_destroy();
1806#endif
1807 cifs_destroy_request_bufs();
1808 destroy_mids();
1809 cifs_destroy_inodecache();
1810 destroy_workqueue(deferredclose_wq);
1811 destroy_workqueue(cifsoplockd_wq);
1812 destroy_workqueue(decrypt_wq);
1813 destroy_workqueue(fileinfo_put_wq);
1814 destroy_workqueue(cifsiod_wq);
1815 cifs_proc_clean();
1816}
1817
1818MODULE_AUTHOR("Steve French");
1819MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1820MODULE_DESCRIPTION
1821 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1822 "also older servers complying with the SNIA CIFS Specification)");
1823MODULE_VERSION(CIFS_VERSION);
1824MODULE_SOFTDEP("ecb");
1825MODULE_SOFTDEP("hmac");
1826MODULE_SOFTDEP("md5");
1827MODULE_SOFTDEP("nls");
1828MODULE_SOFTDEP("aes");
1829MODULE_SOFTDEP("cmac");
1830MODULE_SOFTDEP("sha256");
1831MODULE_SOFTDEP("sha512");
1832MODULE_SOFTDEP("aead2");
1833MODULE_SOFTDEP("ccm");
1834MODULE_SOFTDEP("gcm");
1835module_init(init_cifs)
1836module_exit(exit_cifs)
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 <net/ipv6.h>
41#include "cifsfs.h"
42#include "cifspdu.h"
43#define DECLARE_GLOBALS_HERE
44#include "cifsglob.h"
45#include "cifsproto.h"
46#include "cifs_debug.h"
47#include "cifs_fs_sb.h"
48#include <linux/mm.h>
49#include <linux/key-type.h>
50#include "cifs_spnego.h"
51#include "fscache.h"
52#ifdef CONFIG_CIFS_SMB2
53#include "smb2pdu.h"
54#endif
55
56int cifsFYI = 0;
57int traceSMB = 0;
58bool enable_oplocks = true;
59unsigned int linuxExtEnabled = 1;
60unsigned int lookupCacheEnabled = 1;
61unsigned int global_secflags = CIFSSEC_DEF;
62/* unsigned int ntlmv2_support = 0; */
63unsigned int sign_CIFS_PDUs = 1;
64static const struct super_operations cifs_super_ops;
65unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66module_param(CIFSMaxBufSize, uint, 0);
67MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70module_param(cifs_min_rcv, uint, 0);
71MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
72 "1 to 64");
73unsigned int cifs_min_small = 30;
74module_param(cifs_min_small, uint, 0);
75MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
76 "Range: 2 to 256");
77unsigned int cifs_max_pending = CIFS_MAX_REQ;
78module_param(cifs_max_pending, uint, 0444);
79MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81module_param(enable_oplocks, bool, 0644);
82MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
83
84extern mempool_t *cifs_sm_req_poolp;
85extern mempool_t *cifs_req_poolp;
86extern mempool_t *cifs_mid_poolp;
87
88struct workqueue_struct *cifsiod_wq;
89
90#ifdef CONFIG_CIFS_SMB2
91__u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
92#endif
93
94/*
95 * Bumps refcount for cifs super block.
96 * Note that it should be only called if a referece to VFS super block is
97 * already held, e.g. in open-type syscalls context. Otherwise it can race with
98 * atomic_dec_and_test in deactivate_locked_super.
99 */
100void
101cifs_sb_active(struct super_block *sb)
102{
103 struct cifs_sb_info *server = CIFS_SB(sb);
104
105 if (atomic_inc_return(&server->active) == 1)
106 atomic_inc(&sb->s_active);
107}
108
109void
110cifs_sb_deactive(struct super_block *sb)
111{
112 struct cifs_sb_info *server = CIFS_SB(sb);
113
114 if (atomic_dec_and_test(&server->active))
115 deactivate_super(sb);
116}
117
118static int
119cifs_read_super(struct super_block *sb)
120{
121 struct inode *inode;
122 struct cifs_sb_info *cifs_sb;
123 struct cifs_tcon *tcon;
124 int rc = 0;
125
126 cifs_sb = CIFS_SB(sb);
127 tcon = cifs_sb_master_tcon(cifs_sb);
128
129 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
130 sb->s_flags |= MS_POSIXACL;
131
132 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
133 sb->s_maxbytes = MAX_LFS_FILESIZE;
134 else
135 sb->s_maxbytes = MAX_NON_LFS;
136
137 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
138 sb->s_time_gran = 100;
139
140 sb->s_magic = CIFS_MAGIC_NUMBER;
141 sb->s_op = &cifs_super_ops;
142 sb->s_bdi = &cifs_sb->bdi;
143 sb->s_blocksize = CIFS_MAX_MSGSIZE;
144 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
145 inode = cifs_root_iget(sb);
146
147 if (IS_ERR(inode)) {
148 rc = PTR_ERR(inode);
149 goto out_no_root;
150 }
151
152 if (tcon->nocase)
153 sb->s_d_op = &cifs_ci_dentry_ops;
154 else
155 sb->s_d_op = &cifs_dentry_ops;
156
157 sb->s_root = d_make_root(inode);
158 if (!sb->s_root) {
159 rc = -ENOMEM;
160 goto out_no_root;
161 }
162
163#ifdef CONFIG_CIFS_NFSD_EXPORT
164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
165 cifs_dbg(FYI, "export ops supported\n");
166 sb->s_export_op = &cifs_export_ops;
167 }
168#endif /* CONFIG_CIFS_NFSD_EXPORT */
169
170 return 0;
171
172out_no_root:
173 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
174 return rc;
175}
176
177static void cifs_kill_sb(struct super_block *sb)
178{
179 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
180 kill_anon_super(sb);
181 cifs_umount(cifs_sb);
182}
183
184static int
185cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
186{
187 struct super_block *sb = dentry->d_sb;
188 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
189 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
190 struct TCP_Server_Info *server = tcon->ses->server;
191 unsigned int xid;
192 int rc = 0;
193
194 xid = get_xid();
195
196 /*
197 * PATH_MAX may be too long - it would presumably be total path,
198 * but note that some servers (includinng Samba 3) have a shorter
199 * maximum path.
200 *
201 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
202 */
203 buf->f_namelen = PATH_MAX;
204 buf->f_files = 0; /* undefined */
205 buf->f_ffree = 0; /* unlimited */
206
207 if (server->ops->queryfs)
208 rc = server->ops->queryfs(xid, tcon, buf);
209
210 free_xid(xid);
211 return 0;
212}
213
214static int cifs_permission(struct inode *inode, int mask)
215{
216 struct cifs_sb_info *cifs_sb;
217
218 cifs_sb = CIFS_SB(inode->i_sb);
219
220 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
221 if ((mask & MAY_EXEC) && !execute_ok(inode))
222 return -EACCES;
223 else
224 return 0;
225 } else /* file mode might have been restricted at mount time
226 on the client (above and beyond ACL on servers) for
227 servers which do not support setting and viewing mode bits,
228 so allowing client to check permissions is useful */
229 return generic_permission(inode, mask);
230}
231
232static struct kmem_cache *cifs_inode_cachep;
233static struct kmem_cache *cifs_req_cachep;
234static struct kmem_cache *cifs_mid_cachep;
235static struct kmem_cache *cifs_sm_req_cachep;
236mempool_t *cifs_sm_req_poolp;
237mempool_t *cifs_req_poolp;
238mempool_t *cifs_mid_poolp;
239
240static struct inode *
241cifs_alloc_inode(struct super_block *sb)
242{
243 struct cifsInodeInfo *cifs_inode;
244 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
245 if (!cifs_inode)
246 return NULL;
247 cifs_inode->cifsAttrs = 0x20; /* default */
248 cifs_inode->time = 0;
249 /*
250 * Until the file is open and we have gotten oplock info back from the
251 * server, can not assume caching of file data or metadata.
252 */
253 cifs_set_oplock_level(cifs_inode, 0);
254 cifs_inode->delete_pending = false;
255 cifs_inode->invalid_mapping = false;
256 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cifs_inode->flags);
257 clear_bit(CIFS_INODE_PENDING_WRITERS, &cifs_inode->flags);
258 clear_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cifs_inode->flags);
259 spin_lock_init(&cifs_inode->writers_lock);
260 cifs_inode->writers = 0;
261 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
262 cifs_inode->server_eof = 0;
263 cifs_inode->uniqueid = 0;
264 cifs_inode->createtime = 0;
265 cifs_inode->epoch = 0;
266#ifdef CONFIG_CIFS_SMB2
267 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
268#endif
269 /*
270 * Can not set i_flags here - they get immediately overwritten to zero
271 * by the VFS.
272 */
273 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
274 INIT_LIST_HEAD(&cifs_inode->openFileList);
275 INIT_LIST_HEAD(&cifs_inode->llist);
276 return &cifs_inode->vfs_inode;
277}
278
279static void cifs_i_callback(struct rcu_head *head)
280{
281 struct inode *inode = container_of(head, struct inode, i_rcu);
282 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
283}
284
285static void
286cifs_destroy_inode(struct inode *inode)
287{
288 call_rcu(&inode->i_rcu, cifs_i_callback);
289}
290
291static void
292cifs_evict_inode(struct inode *inode)
293{
294 truncate_inode_pages_final(&inode->i_data);
295 clear_inode(inode);
296 cifs_fscache_release_inode_cookie(inode);
297}
298
299static void
300cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
301{
302 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
303 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
304
305 seq_printf(s, ",addr=");
306
307 switch (server->dstaddr.ss_family) {
308 case AF_INET:
309 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
310 break;
311 case AF_INET6:
312 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
313 if (sa6->sin6_scope_id)
314 seq_printf(s, "%%%u", sa6->sin6_scope_id);
315 break;
316 default:
317 seq_printf(s, "(unknown)");
318 }
319}
320
321static void
322cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
323{
324 if (ses->sectype == Unspecified)
325 return;
326
327 seq_printf(s, ",sec=");
328
329 switch (ses->sectype) {
330 case LANMAN:
331 seq_printf(s, "lanman");
332 break;
333 case NTLMv2:
334 seq_printf(s, "ntlmv2");
335 break;
336 case NTLM:
337 seq_printf(s, "ntlm");
338 break;
339 case Kerberos:
340 seq_printf(s, "krb5");
341 break;
342 case RawNTLMSSP:
343 seq_printf(s, "ntlmssp");
344 break;
345 default:
346 /* shouldn't ever happen */
347 seq_printf(s, "unknown");
348 break;
349 }
350
351 if (ses->sign)
352 seq_printf(s, "i");
353}
354
355static void
356cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
357{
358 seq_printf(s, ",cache=");
359
360 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
361 seq_printf(s, "strict");
362 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
363 seq_printf(s, "none");
364 else
365 seq_printf(s, "loose");
366}
367
368static void
369cifs_show_nls(struct seq_file *s, struct nls_table *cur)
370{
371 struct nls_table *def;
372
373 /* Display iocharset= option if it's not default charset */
374 def = load_nls_default();
375 if (def != cur)
376 seq_printf(s, ",iocharset=%s", cur->charset);
377 unload_nls(def);
378}
379
380/*
381 * cifs_show_options() is for displaying mount options in /proc/mounts.
382 * Not all settable options are displayed but most of the important
383 * ones are.
384 */
385static int
386cifs_show_options(struct seq_file *s, struct dentry *root)
387{
388 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
389 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
390 struct sockaddr *srcaddr;
391 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
392
393 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
394 cifs_show_security(s, tcon->ses);
395 cifs_show_cache_flavor(s, cifs_sb);
396
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
398 seq_printf(s, ",multiuser");
399 else if (tcon->ses->user_name)
400 seq_printf(s, ",username=%s", tcon->ses->user_name);
401
402 if (tcon->ses->domainName)
403 seq_printf(s, ",domain=%s", tcon->ses->domainName);
404
405 if (srcaddr->sa_family != AF_UNSPEC) {
406 struct sockaddr_in *saddr4;
407 struct sockaddr_in6 *saddr6;
408 saddr4 = (struct sockaddr_in *)srcaddr;
409 saddr6 = (struct sockaddr_in6 *)srcaddr;
410 if (srcaddr->sa_family == AF_INET6)
411 seq_printf(s, ",srcaddr=%pI6c",
412 &saddr6->sin6_addr);
413 else if (srcaddr->sa_family == AF_INET)
414 seq_printf(s, ",srcaddr=%pI4",
415 &saddr4->sin_addr.s_addr);
416 else
417 seq_printf(s, ",srcaddr=BAD-AF:%i",
418 (int)(srcaddr->sa_family));
419 }
420
421 seq_printf(s, ",uid=%u",
422 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
424 seq_printf(s, ",forceuid");
425 else
426 seq_printf(s, ",noforceuid");
427
428 seq_printf(s, ",gid=%u",
429 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
431 seq_printf(s, ",forcegid");
432 else
433 seq_printf(s, ",noforcegid");
434
435 cifs_show_address(s, tcon->ses->server);
436
437 if (!tcon->unix_ext)
438 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
439 cifs_sb->mnt_file_mode,
440 cifs_sb->mnt_dir_mode);
441
442 cifs_show_nls(s, cifs_sb->local_nls);
443
444 if (tcon->seal)
445 seq_printf(s, ",seal");
446 if (tcon->nocase)
447 seq_printf(s, ",nocase");
448 if (tcon->retry)
449 seq_printf(s, ",hard");
450 if (tcon->unix_ext)
451 seq_printf(s, ",unix");
452 else
453 seq_printf(s, ",nounix");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
455 seq_printf(s, ",posixpaths");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
457 seq_printf(s, ",setuids");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
459 seq_printf(s, ",serverino");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
461 seq_printf(s, ",rwpidforward");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
463 seq_printf(s, ",forcemand");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
465 seq_printf(s, ",nouser_xattr");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
467 seq_printf(s, ",mapchars");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
469 seq_printf(s, ",sfu");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
471 seq_printf(s, ",nobrl");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
473 seq_printf(s, ",cifsacl");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
475 seq_printf(s, ",dynperm");
476 if (root->d_sb->s_flags & MS_POSIXACL)
477 seq_printf(s, ",acl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
479 seq_printf(s, ",mfsymlinks");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
481 seq_printf(s, ",fsc");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
483 seq_printf(s, ",nostrictsync");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
485 seq_printf(s, ",noperm");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
487 seq_printf(s, ",backupuid=%u",
488 from_kuid_munged(&init_user_ns,
489 cifs_sb->mnt_backupuid));
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
491 seq_printf(s, ",backupgid=%u",
492 from_kgid_munged(&init_user_ns,
493 cifs_sb->mnt_backupgid));
494
495 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
496 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
497 /* convert actimeo and display it in seconds */
498 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
499
500 return 0;
501}
502
503static void cifs_umount_begin(struct super_block *sb)
504{
505 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
506 struct cifs_tcon *tcon;
507
508 if (cifs_sb == NULL)
509 return;
510
511 tcon = cifs_sb_master_tcon(cifs_sb);
512
513 spin_lock(&cifs_tcp_ses_lock);
514 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
515 /* we have other mounts to same share or we have
516 already tried to force umount this and woken up
517 all waiting network requests, nothing to do */
518 spin_unlock(&cifs_tcp_ses_lock);
519 return;
520 } else if (tcon->tc_count == 1)
521 tcon->tidStatus = CifsExiting;
522 spin_unlock(&cifs_tcp_ses_lock);
523
524 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
525 /* cancel_notify_requests(tcon); */
526 if (tcon->ses && tcon->ses->server) {
527 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
528 wake_up_all(&tcon->ses->server->request_q);
529 wake_up_all(&tcon->ses->server->response_q);
530 msleep(1); /* yield */
531 /* we have to kick the requests once more */
532 wake_up_all(&tcon->ses->server->response_q);
533 msleep(1);
534 }
535
536 return;
537}
538
539#ifdef CONFIG_CIFS_STATS2
540static int cifs_show_stats(struct seq_file *s, struct dentry *root)
541{
542 /* BB FIXME */
543 return 0;
544}
545#endif
546
547static int cifs_remount(struct super_block *sb, int *flags, char *data)
548{
549 sync_filesystem(sb);
550 *flags |= MS_NODIRATIME;
551 return 0;
552}
553
554static int cifs_drop_inode(struct inode *inode)
555{
556 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
557
558 /* no serverino => unconditional eviction */
559 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
560 generic_drop_inode(inode);
561}
562
563static const struct super_operations cifs_super_ops = {
564 .statfs = cifs_statfs,
565 .alloc_inode = cifs_alloc_inode,
566 .destroy_inode = cifs_destroy_inode,
567 .drop_inode = cifs_drop_inode,
568 .evict_inode = cifs_evict_inode,
569/* .delete_inode = cifs_delete_inode, */ /* Do not need above
570 function unless later we add lazy close of inodes or unless the
571 kernel forgets to call us with the same number of releases (closes)
572 as opens */
573 .show_options = cifs_show_options,
574 .umount_begin = cifs_umount_begin,
575 .remount_fs = cifs_remount,
576#ifdef CONFIG_CIFS_STATS2
577 .show_stats = cifs_show_stats,
578#endif
579};
580
581/*
582 * Get root dentry from superblock according to prefix path mount option.
583 * Return dentry with refcount + 1 on success and NULL otherwise.
584 */
585static struct dentry *
586cifs_get_root(struct smb_vol *vol, struct super_block *sb)
587{
588 struct dentry *dentry;
589 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
590 char *full_path = NULL;
591 char *s, *p;
592 char sep;
593
594 full_path = cifs_build_path_to_root(vol, cifs_sb,
595 cifs_sb_master_tcon(cifs_sb));
596 if (full_path == NULL)
597 return ERR_PTR(-ENOMEM);
598
599 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
600
601 sep = CIFS_DIR_SEP(cifs_sb);
602 dentry = dget(sb->s_root);
603 p = s = full_path;
604
605 do {
606 struct inode *dir = dentry->d_inode;
607 struct dentry *child;
608
609 if (!dir) {
610 dput(dentry);
611 dentry = ERR_PTR(-ENOENT);
612 break;
613 }
614 if (!S_ISDIR(dir->i_mode)) {
615 dput(dentry);
616 dentry = ERR_PTR(-ENOTDIR);
617 break;
618 }
619
620 /* skip separators */
621 while (*s == sep)
622 s++;
623 if (!*s)
624 break;
625 p = s++;
626 /* next separator */
627 while (*s && *s != sep)
628 s++;
629
630 mutex_lock(&dir->i_mutex);
631 child = lookup_one_len(p, dentry, s - p);
632 mutex_unlock(&dir->i_mutex);
633 dput(dentry);
634 dentry = child;
635 } while (!IS_ERR(dentry));
636 kfree(full_path);
637 return dentry;
638}
639
640static int cifs_set_super(struct super_block *sb, void *data)
641{
642 struct cifs_mnt_data *mnt_data = data;
643 sb->s_fs_info = mnt_data->cifs_sb;
644 return set_anon_super(sb, NULL);
645}
646
647static struct dentry *
648cifs_do_mount(struct file_system_type *fs_type,
649 int flags, const char *dev_name, void *data)
650{
651 int rc;
652 struct super_block *sb;
653 struct cifs_sb_info *cifs_sb;
654 struct smb_vol *volume_info;
655 struct cifs_mnt_data mnt_data;
656 struct dentry *root;
657
658 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
659
660 volume_info = cifs_get_volume_info((char *)data, dev_name);
661 if (IS_ERR(volume_info))
662 return ERR_CAST(volume_info);
663
664 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
665 if (cifs_sb == NULL) {
666 root = ERR_PTR(-ENOMEM);
667 goto out_nls;
668 }
669
670 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
671 if (cifs_sb->mountdata == NULL) {
672 root = ERR_PTR(-ENOMEM);
673 goto out_cifs_sb;
674 }
675
676 cifs_setup_cifs_sb(volume_info, cifs_sb);
677
678 rc = cifs_mount(cifs_sb, volume_info);
679 if (rc) {
680 if (!(flags & MS_SILENT))
681 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
682 rc);
683 root = ERR_PTR(rc);
684 goto out_mountdata;
685 }
686
687 mnt_data.vol = volume_info;
688 mnt_data.cifs_sb = cifs_sb;
689 mnt_data.flags = flags;
690
691 /* BB should we make this contingent on mount parm? */
692 flags |= MS_NODIRATIME | MS_NOATIME;
693
694 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
695 if (IS_ERR(sb)) {
696 root = ERR_CAST(sb);
697 cifs_umount(cifs_sb);
698 goto out;
699 }
700
701 if (sb->s_root) {
702 cifs_dbg(FYI, "Use existing superblock\n");
703 cifs_umount(cifs_sb);
704 } else {
705 rc = cifs_read_super(sb);
706 if (rc) {
707 root = ERR_PTR(rc);
708 goto out_super;
709 }
710
711 sb->s_flags |= MS_ACTIVE;
712 }
713
714 root = cifs_get_root(volume_info, sb);
715 if (IS_ERR(root))
716 goto out_super;
717
718 cifs_dbg(FYI, "dentry root is: %p\n", root);
719 goto out;
720
721out_super:
722 deactivate_locked_super(sb);
723out:
724 cifs_cleanup_volume_info(volume_info);
725 return root;
726
727out_mountdata:
728 kfree(cifs_sb->mountdata);
729out_cifs_sb:
730 kfree(cifs_sb);
731out_nls:
732 unload_nls(volume_info->local_nls);
733 goto out;
734}
735
736static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
737 unsigned long nr_segs, loff_t pos)
738{
739 struct inode *inode = file_inode(iocb->ki_filp);
740 struct cifsInodeInfo *cinode = CIFS_I(inode);
741 ssize_t written;
742 int rc;
743
744 written = cifs_get_writer(cinode);
745 if (written)
746 return written;
747
748 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
749
750 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
751 goto out;
752
753 rc = filemap_fdatawrite(inode->i_mapping);
754 if (rc)
755 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
756 rc, inode);
757
758out:
759 cifs_put_writer(cinode);
760 return written;
761}
762
763static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
764{
765 /*
766 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
767 * the cached file length
768 */
769 if (whence != SEEK_SET && whence != SEEK_CUR) {
770 int rc;
771 struct inode *inode = file_inode(file);
772
773 /*
774 * We need to be sure that all dirty pages are written and the
775 * server has the newest file length.
776 */
777 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
778 inode->i_mapping->nrpages != 0) {
779 rc = filemap_fdatawait(inode->i_mapping);
780 if (rc) {
781 mapping_set_error(inode->i_mapping, rc);
782 return rc;
783 }
784 }
785 /*
786 * Some applications poll for the file length in this strange
787 * way so we must seek to end on non-oplocked files by
788 * setting the revalidate time to zero.
789 */
790 CIFS_I(inode)->time = 0;
791
792 rc = cifs_revalidate_file_attr(file);
793 if (rc < 0)
794 return (loff_t)rc;
795 }
796 return generic_file_llseek(file, offset, whence);
797}
798
799static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
800{
801 /*
802 * Note that this is called by vfs setlease with i_lock held to
803 * protect *lease from going away.
804 */
805 struct inode *inode = file_inode(file);
806 struct cifsFileInfo *cfile = file->private_data;
807
808 if (!(S_ISREG(inode->i_mode)))
809 return -EINVAL;
810
811 /* check if file is oplocked */
812 if (((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
813 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
814 return generic_setlease(file, arg, lease);
815 else if (tlink_tcon(cfile->tlink)->local_lease &&
816 !CIFS_CACHE_READ(CIFS_I(inode)))
817 /*
818 * If the server claims to support oplock on this file, then we
819 * still need to check oplock even if the local_lease mount
820 * option is set, but there are servers which do not support
821 * oplock for which this mount option may be useful if the user
822 * knows that the file won't be changed on the server by anyone
823 * else.
824 */
825 return generic_setlease(file, arg, lease);
826 else
827 return -EAGAIN;
828}
829
830struct file_system_type cifs_fs_type = {
831 .owner = THIS_MODULE,
832 .name = "cifs",
833 .mount = cifs_do_mount,
834 .kill_sb = cifs_kill_sb,
835 /* .fs_flags */
836};
837MODULE_ALIAS_FS("cifs");
838const struct inode_operations cifs_dir_inode_ops = {
839 .create = cifs_create,
840 .atomic_open = cifs_atomic_open,
841 .lookup = cifs_lookup,
842 .getattr = cifs_getattr,
843 .unlink = cifs_unlink,
844 .link = cifs_hardlink,
845 .mkdir = cifs_mkdir,
846 .rmdir = cifs_rmdir,
847 .rename = cifs_rename,
848 .permission = cifs_permission,
849/* revalidate:cifs_revalidate, */
850 .setattr = cifs_setattr,
851 .symlink = cifs_symlink,
852 .mknod = cifs_mknod,
853#ifdef CONFIG_CIFS_XATTR
854 .setxattr = cifs_setxattr,
855 .getxattr = cifs_getxattr,
856 .listxattr = cifs_listxattr,
857 .removexattr = cifs_removexattr,
858#endif
859};
860
861const struct inode_operations cifs_file_inode_ops = {
862/* revalidate:cifs_revalidate, */
863 .setattr = cifs_setattr,
864 .getattr = cifs_getattr, /* do we need this anymore? */
865 .permission = cifs_permission,
866#ifdef CONFIG_CIFS_XATTR
867 .setxattr = cifs_setxattr,
868 .getxattr = cifs_getxattr,
869 .listxattr = cifs_listxattr,
870 .removexattr = cifs_removexattr,
871#endif
872};
873
874const struct inode_operations cifs_symlink_inode_ops = {
875 .readlink = generic_readlink,
876 .follow_link = cifs_follow_link,
877 .put_link = kfree_put_link,
878 .permission = cifs_permission,
879 /* BB add the following two eventually */
880 /* revalidate: cifs_revalidate,
881 setattr: cifs_notify_change, *//* BB do we need notify change */
882#ifdef CONFIG_CIFS_XATTR
883 .setxattr = cifs_setxattr,
884 .getxattr = cifs_getxattr,
885 .listxattr = cifs_listxattr,
886 .removexattr = cifs_removexattr,
887#endif
888};
889
890const struct file_operations cifs_file_ops = {
891 .read = do_sync_read,
892 .write = do_sync_write,
893 .aio_read = generic_file_aio_read,
894 .aio_write = cifs_file_aio_write,
895 .open = cifs_open,
896 .release = cifs_close,
897 .lock = cifs_lock,
898 .fsync = cifs_fsync,
899 .flush = cifs_flush,
900 .mmap = cifs_file_mmap,
901 .splice_read = generic_file_splice_read,
902 .llseek = cifs_llseek,
903#ifdef CONFIG_CIFS_POSIX
904 .unlocked_ioctl = cifs_ioctl,
905#endif /* CONFIG_CIFS_POSIX */
906 .setlease = cifs_setlease,
907};
908
909const struct file_operations cifs_file_strict_ops = {
910 .read = do_sync_read,
911 .write = do_sync_write,
912 .aio_read = cifs_strict_readv,
913 .aio_write = cifs_strict_writev,
914 .open = cifs_open,
915 .release = cifs_close,
916 .lock = cifs_lock,
917 .fsync = cifs_strict_fsync,
918 .flush = cifs_flush,
919 .mmap = cifs_file_strict_mmap,
920 .splice_read = generic_file_splice_read,
921 .llseek = cifs_llseek,
922#ifdef CONFIG_CIFS_POSIX
923 .unlocked_ioctl = cifs_ioctl,
924#endif /* CONFIG_CIFS_POSIX */
925 .setlease = cifs_setlease,
926};
927
928const struct file_operations cifs_file_direct_ops = {
929 /* BB reevaluate whether they can be done with directio, no cache */
930 .read = do_sync_read,
931 .write = do_sync_write,
932 .aio_read = cifs_user_readv,
933 .aio_write = cifs_user_writev,
934 .open = cifs_open,
935 .release = cifs_close,
936 .lock = cifs_lock,
937 .fsync = cifs_fsync,
938 .flush = cifs_flush,
939 .mmap = cifs_file_mmap,
940 .splice_read = generic_file_splice_read,
941#ifdef CONFIG_CIFS_POSIX
942 .unlocked_ioctl = cifs_ioctl,
943#endif /* CONFIG_CIFS_POSIX */
944 .llseek = cifs_llseek,
945 .setlease = cifs_setlease,
946};
947
948const struct file_operations cifs_file_nobrl_ops = {
949 .read = do_sync_read,
950 .write = do_sync_write,
951 .aio_read = generic_file_aio_read,
952 .aio_write = cifs_file_aio_write,
953 .open = cifs_open,
954 .release = cifs_close,
955 .fsync = cifs_fsync,
956 .flush = cifs_flush,
957 .mmap = cifs_file_mmap,
958 .splice_read = generic_file_splice_read,
959 .llseek = cifs_llseek,
960#ifdef CONFIG_CIFS_POSIX
961 .unlocked_ioctl = cifs_ioctl,
962#endif /* CONFIG_CIFS_POSIX */
963 .setlease = cifs_setlease,
964};
965
966const struct file_operations cifs_file_strict_nobrl_ops = {
967 .read = do_sync_read,
968 .write = do_sync_write,
969 .aio_read = cifs_strict_readv,
970 .aio_write = cifs_strict_writev,
971 .open = cifs_open,
972 .release = cifs_close,
973 .fsync = cifs_strict_fsync,
974 .flush = cifs_flush,
975 .mmap = cifs_file_strict_mmap,
976 .splice_read = generic_file_splice_read,
977 .llseek = cifs_llseek,
978#ifdef CONFIG_CIFS_POSIX
979 .unlocked_ioctl = cifs_ioctl,
980#endif /* CONFIG_CIFS_POSIX */
981 .setlease = cifs_setlease,
982};
983
984const struct file_operations cifs_file_direct_nobrl_ops = {
985 /* BB reevaluate whether they can be done with directio, no cache */
986 .read = do_sync_read,
987 .write = do_sync_write,
988 .aio_read = cifs_user_readv,
989 .aio_write = cifs_user_writev,
990 .open = cifs_open,
991 .release = cifs_close,
992 .fsync = cifs_fsync,
993 .flush = cifs_flush,
994 .mmap = cifs_file_mmap,
995 .splice_read = generic_file_splice_read,
996#ifdef CONFIG_CIFS_POSIX
997 .unlocked_ioctl = cifs_ioctl,
998#endif /* CONFIG_CIFS_POSIX */
999 .llseek = cifs_llseek,
1000 .setlease = cifs_setlease,
1001};
1002
1003const struct file_operations cifs_dir_ops = {
1004 .iterate = cifs_readdir,
1005 .release = cifs_closedir,
1006 .read = generic_read_dir,
1007 .unlocked_ioctl = cifs_ioctl,
1008 .llseek = generic_file_llseek,
1009};
1010
1011static void
1012cifs_init_once(void *inode)
1013{
1014 struct cifsInodeInfo *cifsi = inode;
1015
1016 inode_init_once(&cifsi->vfs_inode);
1017 init_rwsem(&cifsi->lock_sem);
1018}
1019
1020static int __init
1021cifs_init_inodecache(void)
1022{
1023 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1024 sizeof(struct cifsInodeInfo),
1025 0, (SLAB_RECLAIM_ACCOUNT|
1026 SLAB_MEM_SPREAD),
1027 cifs_init_once);
1028 if (cifs_inode_cachep == NULL)
1029 return -ENOMEM;
1030
1031 return 0;
1032}
1033
1034static void
1035cifs_destroy_inodecache(void)
1036{
1037 /*
1038 * Make sure all delayed rcu free inodes are flushed before we
1039 * destroy cache.
1040 */
1041 rcu_barrier();
1042 kmem_cache_destroy(cifs_inode_cachep);
1043}
1044
1045static int
1046cifs_init_request_bufs(void)
1047{
1048 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1049#ifdef CONFIG_CIFS_SMB2
1050 /*
1051 * SMB2 maximum header size is bigger than CIFS one - no problems to
1052 * allocate some more bytes for CIFS.
1053 */
1054 max_hdr_size = MAX_SMB2_HDR_SIZE;
1055#endif
1056 if (CIFSMaxBufSize < 8192) {
1057 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1058 Unicode path name has to fit in any SMB/CIFS path based frames */
1059 CIFSMaxBufSize = 8192;
1060 } else if (CIFSMaxBufSize > 1024*127) {
1061 CIFSMaxBufSize = 1024 * 127;
1062 } else {
1063 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1064 }
1065/*
1066 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1067 CIFSMaxBufSize, CIFSMaxBufSize);
1068*/
1069 cifs_req_cachep = kmem_cache_create("cifs_request",
1070 CIFSMaxBufSize + max_hdr_size, 0,
1071 SLAB_HWCACHE_ALIGN, NULL);
1072 if (cifs_req_cachep == NULL)
1073 return -ENOMEM;
1074
1075 if (cifs_min_rcv < 1)
1076 cifs_min_rcv = 1;
1077 else if (cifs_min_rcv > 64) {
1078 cifs_min_rcv = 64;
1079 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1080 }
1081
1082 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1083 cifs_req_cachep);
1084
1085 if (cifs_req_poolp == NULL) {
1086 kmem_cache_destroy(cifs_req_cachep);
1087 return -ENOMEM;
1088 }
1089 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1090 almost all handle based requests (but not write response, nor is it
1091 sufficient for path based requests). A smaller size would have
1092 been more efficient (compacting multiple slab items on one 4k page)
1093 for the case in which debug was on, but this larger size allows
1094 more SMBs to use small buffer alloc and is still much more
1095 efficient to alloc 1 per page off the slab compared to 17K (5page)
1096 alloc of large cifs buffers even when page debugging is on */
1097 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1098 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1099 NULL);
1100 if (cifs_sm_req_cachep == NULL) {
1101 mempool_destroy(cifs_req_poolp);
1102 kmem_cache_destroy(cifs_req_cachep);
1103 return -ENOMEM;
1104 }
1105
1106 if (cifs_min_small < 2)
1107 cifs_min_small = 2;
1108 else if (cifs_min_small > 256) {
1109 cifs_min_small = 256;
1110 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1111 }
1112
1113 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1114 cifs_sm_req_cachep);
1115
1116 if (cifs_sm_req_poolp == NULL) {
1117 mempool_destroy(cifs_req_poolp);
1118 kmem_cache_destroy(cifs_req_cachep);
1119 kmem_cache_destroy(cifs_sm_req_cachep);
1120 return -ENOMEM;
1121 }
1122
1123 return 0;
1124}
1125
1126static void
1127cifs_destroy_request_bufs(void)
1128{
1129 mempool_destroy(cifs_req_poolp);
1130 kmem_cache_destroy(cifs_req_cachep);
1131 mempool_destroy(cifs_sm_req_poolp);
1132 kmem_cache_destroy(cifs_sm_req_cachep);
1133}
1134
1135static int
1136cifs_init_mids(void)
1137{
1138 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1139 sizeof(struct mid_q_entry), 0,
1140 SLAB_HWCACHE_ALIGN, NULL);
1141 if (cifs_mid_cachep == NULL)
1142 return -ENOMEM;
1143
1144 /* 3 is a reasonable minimum number of simultaneous operations */
1145 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1146 if (cifs_mid_poolp == NULL) {
1147 kmem_cache_destroy(cifs_mid_cachep);
1148 return -ENOMEM;
1149 }
1150
1151 return 0;
1152}
1153
1154static void
1155cifs_destroy_mids(void)
1156{
1157 mempool_destroy(cifs_mid_poolp);
1158 kmem_cache_destroy(cifs_mid_cachep);
1159}
1160
1161static int __init
1162init_cifs(void)
1163{
1164 int rc = 0;
1165 cifs_proc_init();
1166 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1167#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1168 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1169 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1170#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1171/*
1172 * Initialize Global counters
1173 */
1174 atomic_set(&sesInfoAllocCount, 0);
1175 atomic_set(&tconInfoAllocCount, 0);
1176 atomic_set(&tcpSesAllocCount, 0);
1177 atomic_set(&tcpSesReconnectCount, 0);
1178 atomic_set(&tconInfoReconnectCount, 0);
1179
1180 atomic_set(&bufAllocCount, 0);
1181 atomic_set(&smBufAllocCount, 0);
1182#ifdef CONFIG_CIFS_STATS2
1183 atomic_set(&totBufAllocCount, 0);
1184 atomic_set(&totSmBufAllocCount, 0);
1185#endif /* CONFIG_CIFS_STATS2 */
1186
1187 atomic_set(&midCount, 0);
1188 GlobalCurrentXid = 0;
1189 GlobalTotalActiveXid = 0;
1190 GlobalMaxActiveXid = 0;
1191 spin_lock_init(&cifs_tcp_ses_lock);
1192 spin_lock_init(&cifs_file_list_lock);
1193 spin_lock_init(&GlobalMid_Lock);
1194
1195#ifdef CONFIG_CIFS_SMB2
1196 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1197#endif
1198
1199 if (cifs_max_pending < 2) {
1200 cifs_max_pending = 2;
1201 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1202 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1203 cifs_max_pending = CIFS_MAX_REQ;
1204 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1205 CIFS_MAX_REQ);
1206 }
1207
1208 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1209 if (!cifsiod_wq) {
1210 rc = -ENOMEM;
1211 goto out_clean_proc;
1212 }
1213
1214 rc = cifs_fscache_register();
1215 if (rc)
1216 goto out_destroy_wq;
1217
1218 rc = cifs_init_inodecache();
1219 if (rc)
1220 goto out_unreg_fscache;
1221
1222 rc = cifs_init_mids();
1223 if (rc)
1224 goto out_destroy_inodecache;
1225
1226 rc = cifs_init_request_bufs();
1227 if (rc)
1228 goto out_destroy_mids;
1229
1230#ifdef CONFIG_CIFS_UPCALL
1231 rc = register_key_type(&cifs_spnego_key_type);
1232 if (rc)
1233 goto out_destroy_request_bufs;
1234#endif /* CONFIG_CIFS_UPCALL */
1235
1236#ifdef CONFIG_CIFS_ACL
1237 rc = init_cifs_idmap();
1238 if (rc)
1239 goto out_register_key_type;
1240#endif /* CONFIG_CIFS_ACL */
1241
1242 rc = register_filesystem(&cifs_fs_type);
1243 if (rc)
1244 goto out_init_cifs_idmap;
1245
1246 return 0;
1247
1248out_init_cifs_idmap:
1249#ifdef CONFIG_CIFS_ACL
1250 exit_cifs_idmap();
1251out_register_key_type:
1252#endif
1253#ifdef CONFIG_CIFS_UPCALL
1254 unregister_key_type(&cifs_spnego_key_type);
1255out_destroy_request_bufs:
1256#endif
1257 cifs_destroy_request_bufs();
1258out_destroy_mids:
1259 cifs_destroy_mids();
1260out_destroy_inodecache:
1261 cifs_destroy_inodecache();
1262out_unreg_fscache:
1263 cifs_fscache_unregister();
1264out_destroy_wq:
1265 destroy_workqueue(cifsiod_wq);
1266out_clean_proc:
1267 cifs_proc_clean();
1268 return rc;
1269}
1270
1271static void __exit
1272exit_cifs(void)
1273{
1274 cifs_dbg(NOISY, "exit_cifs\n");
1275 unregister_filesystem(&cifs_fs_type);
1276 cifs_dfs_release_automount_timer();
1277#ifdef CONFIG_CIFS_ACL
1278 exit_cifs_idmap();
1279#endif
1280#ifdef CONFIG_CIFS_UPCALL
1281 unregister_key_type(&cifs_spnego_key_type);
1282#endif
1283 cifs_destroy_request_bufs();
1284 cifs_destroy_mids();
1285 cifs_destroy_inodecache();
1286 cifs_fscache_unregister();
1287 destroy_workqueue(cifsiod_wq);
1288 cifs_proc_clean();
1289}
1290
1291MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1292MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1293MODULE_DESCRIPTION
1294 ("VFS to access servers complying with the SNIA CIFS Specification "
1295 "e.g. Samba and Windows");
1296MODULE_VERSION(CIFS_VERSION);
1297module_init(init_cifs)
1298module_exit(exit_cifs)