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
60 int cifsFYI = 0;
61 bool traceSMB;
62 bool enable_oplocks = true;
63 bool linuxExtEnabled = true;
64 bool lookupCacheEnabled = true;
65 bool disable_legacy_dialects; /* false by default */
66 bool enable_gcm_256 = true;
67 bool require_gcm_256; /* false by default */
68 bool enable_negotiate_signing; /* false by default */
69 unsigned int global_secflags = CIFSSEC_DEF;
70 /* unsigned int ntlmv2_support = 0; */
71 unsigned int sign_CIFS_PDUs = 1;
72
73 /*
74 * Global transaction id (XID) information
75 */
76 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
77 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
78 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
79 spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
80
81 /*
82 * Global counters, updated atomically
83 */
84 atomic_t sesInfoAllocCount;
85 atomic_t tconInfoAllocCount;
86 atomic_t tcpSesNextId;
87 atomic_t tcpSesAllocCount;
88 atomic_t tcpSesReconnectCount;
89 atomic_t tconInfoReconnectCount;
90
91 atomic_t mid_count;
92 atomic_t buf_alloc_count;
93 atomic_t small_buf_alloc_count;
94 #ifdef CONFIG_CIFS_STATS2
95 atomic_t total_buf_alloc_count;
96 atomic_t total_small_buf_alloc_count;
97 #endif/* STATS2 */
98 struct list_head cifs_tcp_ses_list;
99 spinlock_t cifs_tcp_ses_lock;
100 static const struct super_operations cifs_super_ops;
101 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
102 module_param(CIFSMaxBufSize, uint, 0444);
103 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
104 "for CIFS requests. "
105 "Default: 16384 Range: 8192 to 130048");
106 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
107 module_param(cifs_min_rcv, uint, 0444);
108 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
109 "1 to 64");
110 unsigned int cifs_min_small = 30;
111 module_param(cifs_min_small, uint, 0444);
112 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
113 "Range: 2 to 256");
114 unsigned int cifs_max_pending = CIFS_MAX_REQ;
115 module_param(cifs_max_pending, uint, 0444);
116 MODULE_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
120 unsigned int slow_rsp_threshold = 1;
121 module_param(slow_rsp_threshold, uint, 0644);
122 MODULE_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
127 module_param(enable_oplocks, bool, 0644);
128 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
129
130 module_param(enable_gcm_256, bool, 0644);
131 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
132
133 module_param(require_gcm_256, bool, 0644);
134 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
135
136 module_param(enable_negotiate_signing, bool, 0644);
137 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
138
139 module_param(disable_legacy_dialects, bool, 0644);
140 MODULE_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
148 extern mempool_t *cifs_sm_req_poolp;
149 extern mempool_t *cifs_req_poolp;
150 extern mempool_t *cifs_mid_poolp;
151
152 struct workqueue_struct *cifsiod_wq;
153 struct workqueue_struct *decrypt_wq;
154 struct workqueue_struct *fileinfo_put_wq;
155 struct workqueue_struct *cifsoplockd_wq;
156 struct 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 */
165 void
cifs_sb_active(struct super_block * sb)166 cifs_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
174 void
cifs_sb_deactive(struct super_block * sb)175 cifs_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
183 static int
cifs_read_super(struct super_block * sb)184 cifs_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
279 out_no_root:
280 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
281 return rc;
282 }
283
cifs_kill_sb(struct super_block * sb)284 static 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
304 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)305 cifs_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
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)336 static 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
cifs_permission(struct user_namespace * mnt_userns,struct inode * inode,int mask)348 static 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
367 static struct kmem_cache *cifs_inode_cachep;
368 static struct kmem_cache *cifs_req_cachep;
369 static struct kmem_cache *cifs_mid_cachep;
370 static struct kmem_cache *cifs_sm_req_cachep;
371 mempool_t *cifs_sm_req_poolp;
372 mempool_t *cifs_req_poolp;
373 mempool_t *cifs_mid_poolp;
374
375 static struct inode *
cifs_alloc_inode(struct super_block * sb)376 cifs_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
413 static void
cifs_free_inode(struct inode * inode)414 cifs_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
423 static void
cifs_evict_inode(struct inode * inode)424 cifs_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
433 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)434 cifs_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
457 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)458 cifs_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
492 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)493 cifs_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 */
cifs_show_devname(struct seq_file * m,struct dentry * root)513 static 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 */
534 static int
cifs_show_options(struct seq_file * s,struct dentry * root)535 cifs_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
cifs_umount_begin(struct super_block * sb)719 static 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 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 }
739 /*
740 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
741 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
742 */
743 spin_unlock(&tcon->tc_lock);
744 spin_unlock(&cifs_tcp_ses_lock);
745
746 cifs_close_all_deferred_files(tcon);
747 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
748 /* cancel_notify_requests(tcon); */
749 if (tcon->ses && tcon->ses->server) {
750 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
751 wake_up_all(&tcon->ses->server->request_q);
752 wake_up_all(&tcon->ses->server->response_q);
753 msleep(1); /* yield */
754 /* we have to kick the requests once more */
755 wake_up_all(&tcon->ses->server->response_q);
756 msleep(1);
757 }
758
759 return;
760 }
761
cifs_freeze(struct super_block * sb)762 static int cifs_freeze(struct super_block *sb)
763 {
764 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
765 struct cifs_tcon *tcon;
766
767 if (cifs_sb == NULL)
768 return 0;
769
770 tcon = cifs_sb_master_tcon(cifs_sb);
771
772 cifs_close_all_deferred_files(tcon);
773 return 0;
774 }
775
776 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)777 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
778 {
779 /* BB FIXME */
780 return 0;
781 }
782 #endif
783
cifs_write_inode(struct inode * inode,struct writeback_control * wbc)784 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
785 {
786 fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
787 return 0;
788 }
789
cifs_drop_inode(struct inode * inode)790 static int cifs_drop_inode(struct inode *inode)
791 {
792 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
793
794 /* no serverino => unconditional eviction */
795 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
796 generic_drop_inode(inode);
797 }
798
799 static const struct super_operations cifs_super_ops = {
800 .statfs = cifs_statfs,
801 .alloc_inode = cifs_alloc_inode,
802 .write_inode = cifs_write_inode,
803 .free_inode = cifs_free_inode,
804 .drop_inode = cifs_drop_inode,
805 .evict_inode = cifs_evict_inode,
806 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
807 .show_devname = cifs_show_devname,
808 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
809 function unless later we add lazy close of inodes or unless the
810 kernel forgets to call us with the same number of releases (closes)
811 as opens */
812 .show_options = cifs_show_options,
813 .umount_begin = cifs_umount_begin,
814 .freeze_fs = cifs_freeze,
815 #ifdef CONFIG_CIFS_STATS2
816 .show_stats = cifs_show_stats,
817 #endif
818 };
819
820 /*
821 * Get root dentry from superblock according to prefix path mount option.
822 * Return dentry with refcount + 1 on success and NULL otherwise.
823 */
824 static struct dentry *
cifs_get_root(struct smb3_fs_context * ctx,struct super_block * sb)825 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
826 {
827 struct dentry *dentry;
828 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
829 char *full_path = NULL;
830 char *s, *p;
831 char sep;
832
833 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
834 return dget(sb->s_root);
835
836 full_path = cifs_build_path_to_root(ctx, cifs_sb,
837 cifs_sb_master_tcon(cifs_sb), 0);
838 if (full_path == NULL)
839 return ERR_PTR(-ENOMEM);
840
841 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
842
843 sep = CIFS_DIR_SEP(cifs_sb);
844 dentry = dget(sb->s_root);
845 s = full_path;
846
847 do {
848 struct inode *dir = d_inode(dentry);
849 struct dentry *child;
850
851 if (!S_ISDIR(dir->i_mode)) {
852 dput(dentry);
853 dentry = ERR_PTR(-ENOTDIR);
854 break;
855 }
856
857 /* skip separators */
858 while (*s == sep)
859 s++;
860 if (!*s)
861 break;
862 p = s++;
863 /* next separator */
864 while (*s && *s != sep)
865 s++;
866
867 child = lookup_positive_unlocked(p, dentry, s - p);
868 dput(dentry);
869 dentry = child;
870 } while (!IS_ERR(dentry));
871 kfree(full_path);
872 return dentry;
873 }
874
cifs_set_super(struct super_block * sb,void * data)875 static int cifs_set_super(struct super_block *sb, void *data)
876 {
877 struct cifs_mnt_data *mnt_data = data;
878 sb->s_fs_info = mnt_data->cifs_sb;
879 return set_anon_super(sb, NULL);
880 }
881
882 struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,struct smb3_fs_context * old_ctx)883 cifs_smb3_do_mount(struct file_system_type *fs_type,
884 int flags, struct smb3_fs_context *old_ctx)
885 {
886 struct cifs_mnt_data mnt_data;
887 struct cifs_sb_info *cifs_sb;
888 struct super_block *sb;
889 struct dentry *root;
890 int rc;
891
892 /*
893 * Prints in Kernel / CIFS log the attempted mount operation
894 * If CIFS_DEBUG && cifs_FYI
895 */
896 if (cifsFYI)
897 cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags);
898 else
899 cifs_info("Attempting to mount %s\n", old_ctx->UNC);
900
901 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
902 if (!cifs_sb)
903 return ERR_PTR(-ENOMEM);
904
905 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
906 if (!cifs_sb->ctx) {
907 root = ERR_PTR(-ENOMEM);
908 goto out;
909 }
910 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
911 if (rc) {
912 root = ERR_PTR(rc);
913 goto out;
914 }
915
916 rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL);
917 if (rc) {
918 root = ERR_PTR(rc);
919 goto out;
920 }
921
922 rc = cifs_setup_cifs_sb(cifs_sb);
923 if (rc) {
924 root = ERR_PTR(rc);
925 goto out;
926 }
927
928 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
929 if (rc) {
930 if (!(flags & SB_SILENT))
931 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
932 rc);
933 root = ERR_PTR(rc);
934 goto out;
935 }
936
937 mnt_data.ctx = cifs_sb->ctx;
938 mnt_data.cifs_sb = cifs_sb;
939 mnt_data.flags = flags;
940
941 /* BB should we make this contingent on mount parm? */
942 flags |= SB_NODIRATIME | SB_NOATIME;
943
944 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
945 if (IS_ERR(sb)) {
946 cifs_umount(cifs_sb);
947 return ERR_CAST(sb);
948 }
949
950 if (sb->s_root) {
951 cifs_dbg(FYI, "Use existing superblock\n");
952 cifs_umount(cifs_sb);
953 cifs_sb = NULL;
954 } else {
955 rc = cifs_read_super(sb);
956 if (rc) {
957 root = ERR_PTR(rc);
958 goto out_super;
959 }
960
961 sb->s_flags |= SB_ACTIVE;
962 }
963
964 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
965 if (IS_ERR(root))
966 goto out_super;
967
968 if (cifs_sb)
969 cifs_sb->root = dget(root);
970
971 cifs_dbg(FYI, "dentry root is: %p\n", root);
972 return root;
973
974 out_super:
975 deactivate_locked_super(sb);
976 return root;
977 out:
978 kfree(cifs_sb->prepath);
979 smb3_cleanup_fs_context(cifs_sb->ctx);
980 kfree(cifs_sb);
981 return root;
982 }
983
984
985 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)986 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
987 {
988 ssize_t rc;
989 struct inode *inode = file_inode(iocb->ki_filp);
990
991 if (iocb->ki_flags & IOCB_DIRECT)
992 return cifs_user_readv(iocb, iter);
993
994 rc = cifs_revalidate_mapping(inode);
995 if (rc)
996 return rc;
997
998 return generic_file_read_iter(iocb, iter);
999 }
1000
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)1001 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1002 {
1003 struct inode *inode = file_inode(iocb->ki_filp);
1004 struct cifsInodeInfo *cinode = CIFS_I(inode);
1005 ssize_t written;
1006 int rc;
1007
1008 if (iocb->ki_filp->f_flags & O_DIRECT) {
1009 written = cifs_user_writev(iocb, from);
1010 if (written > 0 && CIFS_CACHE_READ(cinode)) {
1011 cifs_zap_mapping(inode);
1012 cifs_dbg(FYI,
1013 "Set no oplock for inode=%p after a write operation\n",
1014 inode);
1015 cinode->oplock = 0;
1016 }
1017 return written;
1018 }
1019
1020 written = cifs_get_writer(cinode);
1021 if (written)
1022 return written;
1023
1024 written = generic_file_write_iter(iocb, from);
1025
1026 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
1027 goto out;
1028
1029 rc = filemap_fdatawrite(inode->i_mapping);
1030 if (rc)
1031 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
1032 rc, inode);
1033
1034 out:
1035 cifs_put_writer(cinode);
1036 return written;
1037 }
1038
cifs_llseek(struct file * file,loff_t offset,int whence)1039 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1040 {
1041 struct cifsFileInfo *cfile = file->private_data;
1042 struct cifs_tcon *tcon;
1043
1044 /*
1045 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1046 * the cached file length
1047 */
1048 if (whence != SEEK_SET && whence != SEEK_CUR) {
1049 int rc;
1050 struct inode *inode = file_inode(file);
1051
1052 /*
1053 * We need to be sure that all dirty pages are written and the
1054 * server has the newest file length.
1055 */
1056 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1057 inode->i_mapping->nrpages != 0) {
1058 rc = filemap_fdatawait(inode->i_mapping);
1059 if (rc) {
1060 mapping_set_error(inode->i_mapping, rc);
1061 return rc;
1062 }
1063 }
1064 /*
1065 * Some applications poll for the file length in this strange
1066 * way so we must seek to end on non-oplocked files by
1067 * setting the revalidate time to zero.
1068 */
1069 CIFS_I(inode)->time = 0;
1070
1071 rc = cifs_revalidate_file_attr(file);
1072 if (rc < 0)
1073 return (loff_t)rc;
1074 }
1075 if (cfile && cfile->tlink) {
1076 tcon = tlink_tcon(cfile->tlink);
1077 if (tcon->ses->server->ops->llseek)
1078 return tcon->ses->server->ops->llseek(file, tcon,
1079 offset, whence);
1080 }
1081 return generic_file_llseek(file, offset, whence);
1082 }
1083
1084 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)1085 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
1086 {
1087 /*
1088 * Note that this is called by vfs setlease with i_lock held to
1089 * protect *lease from going away.
1090 */
1091 struct inode *inode = file_inode(file);
1092 struct cifsFileInfo *cfile = file->private_data;
1093
1094 if (!(S_ISREG(inode->i_mode)))
1095 return -EINVAL;
1096
1097 /* Check if file is oplocked if this is request for new lease */
1098 if (arg == F_UNLCK ||
1099 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1100 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1101 return generic_setlease(file, arg, lease, priv);
1102 else if (tlink_tcon(cfile->tlink)->local_lease &&
1103 !CIFS_CACHE_READ(CIFS_I(inode)))
1104 /*
1105 * If the server claims to support oplock on this file, then we
1106 * still need to check oplock even if the local_lease mount
1107 * option is set, but there are servers which do not support
1108 * oplock for which this mount option may be useful if the user
1109 * knows that the file won't be changed on the server by anyone
1110 * else.
1111 */
1112 return generic_setlease(file, arg, lease, priv);
1113 else
1114 return -EAGAIN;
1115 }
1116
1117 struct file_system_type cifs_fs_type = {
1118 .owner = THIS_MODULE,
1119 .name = "cifs",
1120 .init_fs_context = smb3_init_fs_context,
1121 .parameters = smb3_fs_parameters,
1122 .kill_sb = cifs_kill_sb,
1123 .fs_flags = FS_RENAME_DOES_D_MOVE,
1124 };
1125 MODULE_ALIAS_FS("cifs");
1126
1127 struct file_system_type smb3_fs_type = {
1128 .owner = THIS_MODULE,
1129 .name = "smb3",
1130 .init_fs_context = smb3_init_fs_context,
1131 .parameters = smb3_fs_parameters,
1132 .kill_sb = cifs_kill_sb,
1133 .fs_flags = FS_RENAME_DOES_D_MOVE,
1134 };
1135 MODULE_ALIAS_FS("smb3");
1136 MODULE_ALIAS("smb3");
1137
1138 const struct inode_operations cifs_dir_inode_ops = {
1139 .create = cifs_create,
1140 .atomic_open = cifs_atomic_open,
1141 .lookup = cifs_lookup,
1142 .getattr = cifs_getattr,
1143 .unlink = cifs_unlink,
1144 .link = cifs_hardlink,
1145 .mkdir = cifs_mkdir,
1146 .rmdir = cifs_rmdir,
1147 .rename = cifs_rename2,
1148 .permission = cifs_permission,
1149 .setattr = cifs_setattr,
1150 .symlink = cifs_symlink,
1151 .mknod = cifs_mknod,
1152 .listxattr = cifs_listxattr,
1153 };
1154
1155 const struct inode_operations cifs_file_inode_ops = {
1156 .setattr = cifs_setattr,
1157 .getattr = cifs_getattr,
1158 .permission = cifs_permission,
1159 .listxattr = cifs_listxattr,
1160 .fiemap = cifs_fiemap,
1161 };
1162
cifs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1163 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1164 struct delayed_call *done)
1165 {
1166 char *target_path;
1167
1168 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1169 if (!target_path)
1170 return ERR_PTR(-ENOMEM);
1171
1172 spin_lock(&inode->i_lock);
1173 if (likely(CIFS_I(inode)->symlink_target)) {
1174 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1175 } else {
1176 kfree(target_path);
1177 target_path = ERR_PTR(-EOPNOTSUPP);
1178 }
1179 spin_unlock(&inode->i_lock);
1180
1181 if (!IS_ERR(target_path))
1182 set_delayed_call(done, kfree_link, target_path);
1183
1184 return target_path;
1185 }
1186
1187 const struct inode_operations cifs_symlink_inode_ops = {
1188 .get_link = cifs_get_link,
1189 .setattr = cifs_setattr,
1190 .permission = cifs_permission,
1191 .listxattr = cifs_listxattr,
1192 };
1193
1194 /*
1195 * Advance the EOF marker to after the source range.
1196 */
cifs_precopy_set_eof(struct inode * src_inode,struct cifsInodeInfo * src_cifsi,struct cifs_tcon * src_tcon,unsigned int xid,loff_t src_end)1197 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1198 struct cifs_tcon *src_tcon,
1199 unsigned int xid, loff_t src_end)
1200 {
1201 struct cifsFileInfo *writeable_srcfile;
1202 int rc = -EINVAL;
1203
1204 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1205 if (writeable_srcfile) {
1206 if (src_tcon->ses->server->ops->set_file_size)
1207 rc = src_tcon->ses->server->ops->set_file_size(
1208 xid, src_tcon, writeable_srcfile,
1209 src_inode->i_size, true /* no need to set sparse */);
1210 else
1211 rc = -ENOSYS;
1212 cifsFileInfo_put(writeable_srcfile);
1213 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1214 }
1215
1216 if (rc < 0)
1217 goto set_failed;
1218
1219 netfs_resize_file(&src_cifsi->netfs, src_end);
1220 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1221 return 0;
1222
1223 set_failed:
1224 return filemap_write_and_wait(src_inode->i_mapping);
1225 }
1226
1227 /*
1228 * Flush out either the folio that overlaps the beginning of a range in which
1229 * pos resides or the folio that overlaps the end of a range unless that folio
1230 * is entirely within the range we're going to invalidate. We extend the flush
1231 * bounds to encompass the folio.
1232 */
cifs_flush_folio(struct inode * inode,loff_t pos,loff_t * _fstart,loff_t * _fend,bool first)1233 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1234 bool first)
1235 {
1236 struct folio *folio;
1237 unsigned long long fpos, fend;
1238 pgoff_t index = pos / PAGE_SIZE;
1239 size_t size;
1240 int rc = 0;
1241
1242 folio = filemap_get_folio(inode->i_mapping, index);
1243 if (!folio)
1244 return 0;
1245
1246 size = folio_size(folio);
1247 fpos = folio_pos(folio);
1248 fend = fpos + size - 1;
1249 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1250 *_fend = max_t(unsigned long long, *_fend, fend);
1251 if ((first && pos == fpos) || (!first && pos == fend))
1252 goto out;
1253
1254 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1255 out:
1256 folio_put(folio);
1257 return rc;
1258 }
1259
cifs_remap_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,loff_t len,unsigned int remap_flags)1260 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1261 struct file *dst_file, loff_t destoff, loff_t len,
1262 unsigned int remap_flags)
1263 {
1264 struct inode *src_inode = file_inode(src_file);
1265 struct inode *target_inode = file_inode(dst_file);
1266 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1267 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1268 struct cifsFileInfo *smb_file_src = src_file->private_data;
1269 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1270 struct cifs_tcon *target_tcon, *src_tcon;
1271 unsigned long long destend, fstart, fend, new_size;
1272 unsigned int xid;
1273 int rc;
1274
1275 if (remap_flags & REMAP_FILE_DEDUP)
1276 return -EOPNOTSUPP;
1277 if (remap_flags & ~REMAP_FILE_ADVISORY)
1278 return -EINVAL;
1279
1280 cifs_dbg(FYI, "clone range\n");
1281
1282 xid = get_xid();
1283
1284 if (!smb_file_src || !smb_file_target) {
1285 rc = -EBADF;
1286 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1287 goto out;
1288 }
1289
1290 src_tcon = tlink_tcon(smb_file_src->tlink);
1291 target_tcon = tlink_tcon(smb_file_target->tlink);
1292
1293 /*
1294 * Note: cifs case is easier than btrfs since server responsible for
1295 * checks for proper open modes and file type and if it wants
1296 * server could even support copy of range where source = target
1297 */
1298 lock_two_nondirectories(target_inode, src_inode);
1299
1300 if (len == 0)
1301 len = src_inode->i_size - off;
1302
1303 cifs_dbg(FYI, "clone range\n");
1304
1305 /* Flush the source buffer */
1306 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1307 off + len - 1);
1308 if (rc)
1309 goto unlock;
1310
1311 /* The server-side copy will fail if the source crosses the EOF marker.
1312 * Advance the EOF marker after the flush above to the end of the range
1313 * if it's short of that.
1314 */
1315 if (src_cifsi->netfs.remote_i_size < off + len) {
1316 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1317 if (rc < 0)
1318 goto unlock;
1319 }
1320
1321 new_size = destoff + len;
1322 destend = destoff + len - 1;
1323
1324 /* Flush the folios at either end of the destination range to prevent
1325 * accidental loss of dirty data outside of the range.
1326 */
1327 fstart = destoff;
1328 fend = destend;
1329
1330 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1331 if (rc)
1332 goto unlock;
1333 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1334 if (rc)
1335 goto unlock;
1336
1337 /* Discard all the folios that overlap the destination region. */
1338 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1339 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1340
1341 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1342 i_size_read(target_inode), 0);
1343
1344 rc = -EOPNOTSUPP;
1345 if (target_tcon->ses->server->ops->duplicate_extents) {
1346 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1347 smb_file_src, smb_file_target, off, len, destoff);
1348 if (rc == 0 && new_size > i_size_read(target_inode)) {
1349 truncate_setsize(target_inode, new_size);
1350 netfs_resize_file(&target_cifsi->netfs, new_size);
1351 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1352 new_size);
1353 }
1354 }
1355
1356 /* force revalidate of size and timestamps of target file now
1357 that target is updated on the server */
1358 CIFS_I(target_inode)->time = 0;
1359 unlock:
1360 /* although unlocking in the reverse order from locking is not
1361 strictly necessary here it is a little cleaner to be consistent */
1362 unlock_two_nondirectories(src_inode, target_inode);
1363 out:
1364 free_xid(xid);
1365 return rc < 0 ? rc : len;
1366 }
1367
cifs_file_copychunk_range(unsigned int xid,struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1368 ssize_t cifs_file_copychunk_range(unsigned int xid,
1369 struct file *src_file, loff_t off,
1370 struct file *dst_file, loff_t destoff,
1371 size_t len, unsigned int flags)
1372 {
1373 struct inode *src_inode = file_inode(src_file);
1374 struct inode *target_inode = file_inode(dst_file);
1375 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1376 struct cifsFileInfo *smb_file_src;
1377 struct cifsFileInfo *smb_file_target;
1378 struct cifs_tcon *src_tcon;
1379 struct cifs_tcon *target_tcon;
1380 unsigned long long destend, fstart, fend;
1381 ssize_t rc;
1382
1383 cifs_dbg(FYI, "copychunk range\n");
1384
1385 if (!src_file->private_data || !dst_file->private_data) {
1386 rc = -EBADF;
1387 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1388 goto out;
1389 }
1390
1391 rc = -EXDEV;
1392 smb_file_target = dst_file->private_data;
1393 smb_file_src = src_file->private_data;
1394 src_tcon = tlink_tcon(smb_file_src->tlink);
1395 target_tcon = tlink_tcon(smb_file_target->tlink);
1396
1397 if (src_tcon->ses != target_tcon->ses) {
1398 cifs_dbg(VFS, "source and target of copy not on same server\n");
1399 goto out;
1400 }
1401
1402 rc = -EOPNOTSUPP;
1403 if (!target_tcon->ses->server->ops->copychunk_range)
1404 goto out;
1405
1406 /*
1407 * Note: cifs case is easier than btrfs since server responsible for
1408 * checks for proper open modes and file type and if it wants
1409 * server could even support copy of range where source = target
1410 */
1411 lock_two_nondirectories(target_inode, src_inode);
1412
1413 cifs_dbg(FYI, "about to flush pages\n");
1414
1415 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1416 off + len - 1);
1417 if (rc)
1418 goto unlock;
1419
1420 /* The server-side copy will fail if the source crosses the EOF marker.
1421 * Advance the EOF marker after the flush above to the end of the range
1422 * if it's short of that.
1423 */
1424 if (src_cifsi->server_eof < off + len) {
1425 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1426 if (rc < 0)
1427 goto unlock;
1428 }
1429
1430 destend = destoff + len - 1;
1431
1432 /* Flush the folios at either end of the destination range to prevent
1433 * accidental loss of dirty data outside of the range.
1434 */
1435 fstart = destoff;
1436 fend = destend;
1437
1438 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1439 if (rc)
1440 goto unlock;
1441 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1442 if (rc)
1443 goto unlock;
1444
1445 /* Discard all the folios that overlap the destination region. */
1446 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1447
1448 rc = file_modified(dst_file);
1449 if (!rc) {
1450 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1451 smb_file_src, smb_file_target, off, len, destoff);
1452 if (rc > 0 && destoff + rc > i_size_read(target_inode))
1453 truncate_setsize(target_inode, destoff + rc);
1454 }
1455
1456 file_accessed(src_file);
1457
1458 /* force revalidate of size and timestamps of target file now
1459 * that target is updated on the server
1460 */
1461 CIFS_I(target_inode)->time = 0;
1462
1463 unlock:
1464 /* although unlocking in the reverse order from locking is not
1465 * strictly necessary here it is a little cleaner to be consistent
1466 */
1467 unlock_two_nondirectories(src_inode, target_inode);
1468
1469 out:
1470 return rc;
1471 }
1472
1473 /*
1474 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1475 * is a dummy operation.
1476 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1477 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1478 {
1479 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1480 file, datasync);
1481
1482 return 0;
1483 }
1484
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1485 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1486 struct file *dst_file, loff_t destoff,
1487 size_t len, unsigned int flags)
1488 {
1489 unsigned int xid = get_xid();
1490 ssize_t rc;
1491 struct cifsFileInfo *cfile = dst_file->private_data;
1492
1493 if (cfile->swapfile) {
1494 rc = -EOPNOTSUPP;
1495 free_xid(xid);
1496 return rc;
1497 }
1498
1499 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1500 len, flags);
1501 free_xid(xid);
1502
1503 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1504 rc = generic_copy_file_range(src_file, off, dst_file,
1505 destoff, len, flags);
1506 return rc;
1507 }
1508
1509 const struct file_operations cifs_file_ops = {
1510 .read_iter = cifs_loose_read_iter,
1511 .write_iter = cifs_file_write_iter,
1512 .open = cifs_open,
1513 .release = cifs_close,
1514 .lock = cifs_lock,
1515 .flock = cifs_flock,
1516 .fsync = cifs_fsync,
1517 .flush = cifs_flush,
1518 .mmap = cifs_file_mmap,
1519 .splice_read = generic_file_splice_read,
1520 .splice_write = iter_file_splice_write,
1521 .llseek = cifs_llseek,
1522 .unlocked_ioctl = cifs_ioctl,
1523 .copy_file_range = cifs_copy_file_range,
1524 .remap_file_range = cifs_remap_file_range,
1525 .setlease = cifs_setlease,
1526 .fallocate = cifs_fallocate,
1527 };
1528
1529 const struct file_operations cifs_file_strict_ops = {
1530 .read_iter = cifs_strict_readv,
1531 .write_iter = cifs_strict_writev,
1532 .open = cifs_open,
1533 .release = cifs_close,
1534 .lock = cifs_lock,
1535 .flock = cifs_flock,
1536 .fsync = cifs_strict_fsync,
1537 .flush = cifs_flush,
1538 .mmap = cifs_file_strict_mmap,
1539 .splice_read = generic_file_splice_read,
1540 .splice_write = iter_file_splice_write,
1541 .llseek = cifs_llseek,
1542 .unlocked_ioctl = cifs_ioctl,
1543 .copy_file_range = cifs_copy_file_range,
1544 .remap_file_range = cifs_remap_file_range,
1545 .setlease = cifs_setlease,
1546 .fallocate = cifs_fallocate,
1547 };
1548
1549 const struct file_operations cifs_file_direct_ops = {
1550 .read_iter = cifs_direct_readv,
1551 .write_iter = cifs_direct_writev,
1552 .open = cifs_open,
1553 .release = cifs_close,
1554 .lock = cifs_lock,
1555 .flock = cifs_flock,
1556 .fsync = cifs_fsync,
1557 .flush = cifs_flush,
1558 .mmap = cifs_file_mmap,
1559 .splice_read = generic_file_splice_read,
1560 .splice_write = iter_file_splice_write,
1561 .unlocked_ioctl = cifs_ioctl,
1562 .copy_file_range = cifs_copy_file_range,
1563 .remap_file_range = cifs_remap_file_range,
1564 .llseek = cifs_llseek,
1565 .setlease = cifs_setlease,
1566 .fallocate = cifs_fallocate,
1567 };
1568
1569 const struct file_operations cifs_file_nobrl_ops = {
1570 .read_iter = cifs_loose_read_iter,
1571 .write_iter = cifs_file_write_iter,
1572 .open = cifs_open,
1573 .release = cifs_close,
1574 .fsync = cifs_fsync,
1575 .flush = cifs_flush,
1576 .mmap = cifs_file_mmap,
1577 .splice_read = generic_file_splice_read,
1578 .splice_write = iter_file_splice_write,
1579 .llseek = cifs_llseek,
1580 .unlocked_ioctl = cifs_ioctl,
1581 .copy_file_range = cifs_copy_file_range,
1582 .remap_file_range = cifs_remap_file_range,
1583 .setlease = cifs_setlease,
1584 .fallocate = cifs_fallocate,
1585 };
1586
1587 const struct file_operations cifs_file_strict_nobrl_ops = {
1588 .read_iter = cifs_strict_readv,
1589 .write_iter = cifs_strict_writev,
1590 .open = cifs_open,
1591 .release = cifs_close,
1592 .fsync = cifs_strict_fsync,
1593 .flush = cifs_flush,
1594 .mmap = cifs_file_strict_mmap,
1595 .splice_read = generic_file_splice_read,
1596 .splice_write = iter_file_splice_write,
1597 .llseek = cifs_llseek,
1598 .unlocked_ioctl = cifs_ioctl,
1599 .copy_file_range = cifs_copy_file_range,
1600 .remap_file_range = cifs_remap_file_range,
1601 .setlease = cifs_setlease,
1602 .fallocate = cifs_fallocate,
1603 };
1604
1605 const struct file_operations cifs_file_direct_nobrl_ops = {
1606 .read_iter = cifs_direct_readv,
1607 .write_iter = cifs_direct_writev,
1608 .open = cifs_open,
1609 .release = cifs_close,
1610 .fsync = cifs_fsync,
1611 .flush = cifs_flush,
1612 .mmap = cifs_file_mmap,
1613 .splice_read = generic_file_splice_read,
1614 .splice_write = iter_file_splice_write,
1615 .unlocked_ioctl = cifs_ioctl,
1616 .copy_file_range = cifs_copy_file_range,
1617 .remap_file_range = cifs_remap_file_range,
1618 .llseek = cifs_llseek,
1619 .setlease = cifs_setlease,
1620 .fallocate = cifs_fallocate,
1621 };
1622
1623 const struct file_operations cifs_dir_ops = {
1624 .iterate_shared = cifs_readdir,
1625 .release = cifs_closedir,
1626 .read = generic_read_dir,
1627 .unlocked_ioctl = cifs_ioctl,
1628 .copy_file_range = cifs_copy_file_range,
1629 .remap_file_range = cifs_remap_file_range,
1630 .llseek = generic_file_llseek,
1631 .fsync = cifs_dir_fsync,
1632 };
1633
1634 static void
cifs_init_once(void * inode)1635 cifs_init_once(void *inode)
1636 {
1637 struct cifsInodeInfo *cifsi = inode;
1638
1639 inode_init_once(&cifsi->netfs.inode);
1640 init_rwsem(&cifsi->lock_sem);
1641 }
1642
1643 static int __init
cifs_init_inodecache(void)1644 cifs_init_inodecache(void)
1645 {
1646 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1647 sizeof(struct cifsInodeInfo),
1648 0, (SLAB_RECLAIM_ACCOUNT|
1649 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1650 cifs_init_once);
1651 if (cifs_inode_cachep == NULL)
1652 return -ENOMEM;
1653
1654 return 0;
1655 }
1656
1657 static void
cifs_destroy_inodecache(void)1658 cifs_destroy_inodecache(void)
1659 {
1660 /*
1661 * Make sure all delayed rcu free inodes are flushed before we
1662 * destroy cache.
1663 */
1664 rcu_barrier();
1665 kmem_cache_destroy(cifs_inode_cachep);
1666 }
1667
1668 static int
cifs_init_request_bufs(void)1669 cifs_init_request_bufs(void)
1670 {
1671 /*
1672 * SMB2 maximum header size is bigger than CIFS one - no problems to
1673 * allocate some more bytes for CIFS.
1674 */
1675 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1676
1677 if (CIFSMaxBufSize < 8192) {
1678 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1679 Unicode path name has to fit in any SMB/CIFS path based frames */
1680 CIFSMaxBufSize = 8192;
1681 } else if (CIFSMaxBufSize > 1024*127) {
1682 CIFSMaxBufSize = 1024 * 127;
1683 } else {
1684 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1685 }
1686 /*
1687 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1688 CIFSMaxBufSize, CIFSMaxBufSize);
1689 */
1690 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1691 CIFSMaxBufSize + max_hdr_size, 0,
1692 SLAB_HWCACHE_ALIGN, 0,
1693 CIFSMaxBufSize + max_hdr_size,
1694 NULL);
1695 if (cifs_req_cachep == NULL)
1696 return -ENOMEM;
1697
1698 if (cifs_min_rcv < 1)
1699 cifs_min_rcv = 1;
1700 else if (cifs_min_rcv > 64) {
1701 cifs_min_rcv = 64;
1702 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1703 }
1704
1705 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1706 cifs_req_cachep);
1707
1708 if (cifs_req_poolp == NULL) {
1709 kmem_cache_destroy(cifs_req_cachep);
1710 return -ENOMEM;
1711 }
1712 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1713 almost all handle based requests (but not write response, nor is it
1714 sufficient for path based requests). A smaller size would have
1715 been more efficient (compacting multiple slab items on one 4k page)
1716 for the case in which debug was on, but this larger size allows
1717 more SMBs to use small buffer alloc and is still much more
1718 efficient to alloc 1 per page off the slab compared to 17K (5page)
1719 alloc of large cifs buffers even when page debugging is on */
1720 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1721 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1722 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1723 if (cifs_sm_req_cachep == NULL) {
1724 mempool_destroy(cifs_req_poolp);
1725 kmem_cache_destroy(cifs_req_cachep);
1726 return -ENOMEM;
1727 }
1728
1729 if (cifs_min_small < 2)
1730 cifs_min_small = 2;
1731 else if (cifs_min_small > 256) {
1732 cifs_min_small = 256;
1733 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1734 }
1735
1736 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1737 cifs_sm_req_cachep);
1738
1739 if (cifs_sm_req_poolp == NULL) {
1740 mempool_destroy(cifs_req_poolp);
1741 kmem_cache_destroy(cifs_req_cachep);
1742 kmem_cache_destroy(cifs_sm_req_cachep);
1743 return -ENOMEM;
1744 }
1745
1746 return 0;
1747 }
1748
1749 static void
cifs_destroy_request_bufs(void)1750 cifs_destroy_request_bufs(void)
1751 {
1752 mempool_destroy(cifs_req_poolp);
1753 kmem_cache_destroy(cifs_req_cachep);
1754 mempool_destroy(cifs_sm_req_poolp);
1755 kmem_cache_destroy(cifs_sm_req_cachep);
1756 }
1757
init_mids(void)1758 static int init_mids(void)
1759 {
1760 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1761 sizeof(struct mid_q_entry), 0,
1762 SLAB_HWCACHE_ALIGN, NULL);
1763 if (cifs_mid_cachep == NULL)
1764 return -ENOMEM;
1765
1766 /* 3 is a reasonable minimum number of simultaneous operations */
1767 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1768 if (cifs_mid_poolp == NULL) {
1769 kmem_cache_destroy(cifs_mid_cachep);
1770 return -ENOMEM;
1771 }
1772
1773 return 0;
1774 }
1775
destroy_mids(void)1776 static void destroy_mids(void)
1777 {
1778 mempool_destroy(cifs_mid_poolp);
1779 kmem_cache_destroy(cifs_mid_cachep);
1780 }
1781
1782 static int __init
init_cifs(void)1783 init_cifs(void)
1784 {
1785 int rc = 0;
1786 cifs_proc_init();
1787 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1788 /*
1789 * Initialize Global counters
1790 */
1791 atomic_set(&sesInfoAllocCount, 0);
1792 atomic_set(&tconInfoAllocCount, 0);
1793 atomic_set(&tcpSesNextId, 0);
1794 atomic_set(&tcpSesAllocCount, 0);
1795 atomic_set(&tcpSesReconnectCount, 0);
1796 atomic_set(&tconInfoReconnectCount, 0);
1797
1798 atomic_set(&buf_alloc_count, 0);
1799 atomic_set(&small_buf_alloc_count, 0);
1800 #ifdef CONFIG_CIFS_STATS2
1801 atomic_set(&total_buf_alloc_count, 0);
1802 atomic_set(&total_small_buf_alloc_count, 0);
1803 if (slow_rsp_threshold < 1)
1804 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1805 else if (slow_rsp_threshold > 32767)
1806 cifs_dbg(VFS,
1807 "slow response threshold set higher than recommended (0 to 32767)\n");
1808 #endif /* CONFIG_CIFS_STATS2 */
1809
1810 atomic_set(&mid_count, 0);
1811 GlobalCurrentXid = 0;
1812 GlobalTotalActiveXid = 0;
1813 GlobalMaxActiveXid = 0;
1814 spin_lock_init(&cifs_tcp_ses_lock);
1815 spin_lock_init(&GlobalMid_Lock);
1816
1817 cifs_lock_secret = get_random_u32();
1818
1819 if (cifs_max_pending < 2) {
1820 cifs_max_pending = 2;
1821 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1822 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1823 cifs_max_pending = CIFS_MAX_REQ;
1824 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1825 CIFS_MAX_REQ);
1826 }
1827
1828 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1829 if (!cifsiod_wq) {
1830 rc = -ENOMEM;
1831 goto out_clean_proc;
1832 }
1833
1834 /*
1835 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1836 * so that we don't launch too many worker threads but
1837 * Documentation/core-api/workqueue.rst recommends setting it to 0
1838 */
1839
1840 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1841 decrypt_wq = alloc_workqueue("smb3decryptd",
1842 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1843 if (!decrypt_wq) {
1844 rc = -ENOMEM;
1845 goto out_destroy_cifsiod_wq;
1846 }
1847
1848 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1849 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1850 if (!fileinfo_put_wq) {
1851 rc = -ENOMEM;
1852 goto out_destroy_decrypt_wq;
1853 }
1854
1855 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1856 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1857 if (!cifsoplockd_wq) {
1858 rc = -ENOMEM;
1859 goto out_destroy_fileinfo_put_wq;
1860 }
1861
1862 deferredclose_wq = alloc_workqueue("deferredclose",
1863 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1864 if (!deferredclose_wq) {
1865 rc = -ENOMEM;
1866 goto out_destroy_cifsoplockd_wq;
1867 }
1868
1869 rc = cifs_init_inodecache();
1870 if (rc)
1871 goto out_destroy_deferredclose_wq;
1872
1873 rc = init_mids();
1874 if (rc)
1875 goto out_destroy_inodecache;
1876
1877 rc = cifs_init_request_bufs();
1878 if (rc)
1879 goto out_destroy_mids;
1880
1881 #ifdef CONFIG_CIFS_DFS_UPCALL
1882 rc = dfs_cache_init();
1883 if (rc)
1884 goto out_destroy_request_bufs;
1885 #endif /* CONFIG_CIFS_DFS_UPCALL */
1886 #ifdef CONFIG_CIFS_UPCALL
1887 rc = init_cifs_spnego();
1888 if (rc)
1889 goto out_destroy_dfs_cache;
1890 #endif /* CONFIG_CIFS_UPCALL */
1891 #ifdef CONFIG_CIFS_SWN_UPCALL
1892 rc = cifs_genl_init();
1893 if (rc)
1894 goto out_register_key_type;
1895 #endif /* CONFIG_CIFS_SWN_UPCALL */
1896
1897 rc = init_cifs_idmap();
1898 if (rc)
1899 goto out_cifs_swn_init;
1900
1901 rc = register_filesystem(&cifs_fs_type);
1902 if (rc)
1903 goto out_init_cifs_idmap;
1904
1905 rc = register_filesystem(&smb3_fs_type);
1906 if (rc) {
1907 unregister_filesystem(&cifs_fs_type);
1908 goto out_init_cifs_idmap;
1909 }
1910
1911 return 0;
1912
1913 out_init_cifs_idmap:
1914 exit_cifs_idmap();
1915 out_cifs_swn_init:
1916 #ifdef CONFIG_CIFS_SWN_UPCALL
1917 cifs_genl_exit();
1918 out_register_key_type:
1919 #endif
1920 #ifdef CONFIG_CIFS_UPCALL
1921 exit_cifs_spnego();
1922 out_destroy_dfs_cache:
1923 #endif
1924 #ifdef CONFIG_CIFS_DFS_UPCALL
1925 dfs_cache_destroy();
1926 out_destroy_request_bufs:
1927 #endif
1928 cifs_destroy_request_bufs();
1929 out_destroy_mids:
1930 destroy_mids();
1931 out_destroy_inodecache:
1932 cifs_destroy_inodecache();
1933 out_destroy_deferredclose_wq:
1934 destroy_workqueue(deferredclose_wq);
1935 out_destroy_cifsoplockd_wq:
1936 destroy_workqueue(cifsoplockd_wq);
1937 out_destroy_fileinfo_put_wq:
1938 destroy_workqueue(fileinfo_put_wq);
1939 out_destroy_decrypt_wq:
1940 destroy_workqueue(decrypt_wq);
1941 out_destroy_cifsiod_wq:
1942 destroy_workqueue(cifsiod_wq);
1943 out_clean_proc:
1944 cifs_proc_clean();
1945 return rc;
1946 }
1947
1948 static void __exit
exit_cifs(void)1949 exit_cifs(void)
1950 {
1951 cifs_dbg(NOISY, "exit_smb3\n");
1952 unregister_filesystem(&cifs_fs_type);
1953 unregister_filesystem(&smb3_fs_type);
1954 cifs_dfs_release_automount_timer();
1955 exit_cifs_idmap();
1956 #ifdef CONFIG_CIFS_SWN_UPCALL
1957 cifs_genl_exit();
1958 #endif
1959 #ifdef CONFIG_CIFS_UPCALL
1960 exit_cifs_spnego();
1961 #endif
1962 #ifdef CONFIG_CIFS_DFS_UPCALL
1963 dfs_cache_destroy();
1964 #endif
1965 cifs_destroy_request_bufs();
1966 destroy_mids();
1967 cifs_destroy_inodecache();
1968 destroy_workqueue(deferredclose_wq);
1969 destroy_workqueue(cifsoplockd_wq);
1970 destroy_workqueue(decrypt_wq);
1971 destroy_workqueue(fileinfo_put_wq);
1972 destroy_workqueue(cifsiod_wq);
1973 cifs_proc_clean();
1974 }
1975
1976 MODULE_AUTHOR("Steve French");
1977 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1978 MODULE_DESCRIPTION
1979 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1980 "also older servers complying with the SNIA CIFS Specification)");
1981 MODULE_VERSION(CIFS_VERSION);
1982 MODULE_SOFTDEP("ecb");
1983 MODULE_SOFTDEP("hmac");
1984 MODULE_SOFTDEP("md5");
1985 MODULE_SOFTDEP("nls");
1986 MODULE_SOFTDEP("aes");
1987 MODULE_SOFTDEP("cmac");
1988 MODULE_SOFTDEP("sha256");
1989 MODULE_SOFTDEP("sha512");
1990 MODULE_SOFTDEP("aead2");
1991 MODULE_SOFTDEP("ccm");
1992 MODULE_SOFTDEP("gcm");
1993 module_init(init_cifs)
1994 module_exit(exit_cifs)
1995