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/filelock.h>
16 #include <linux/mount.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/list.h>
20 #include <linux/seq_file.h>
21 #include <linux/vfs.h>
22 #include <linux/mempool.h>
23 #include <linux/delay.h>
24 #include <linux/kthread.h>
25 #include <linux/freezer.h>
26 #include <linux/namei.h>
27 #include <linux/random.h>
28 #include <linux/splice.h>
29 #include <linux/uuid.h>
30 #include <linux/xattr.h>
31 #include <uapi/linux/magic.h>
32 #include <net/ipv6.h>
33 #include "cifsfs.h"
34 #include "cifspdu.h"
35 #define DECLARE_GLOBALS_HERE
36 #include "cifsglob.h"
37 #include "cifsproto.h"
38 #include "cifs_debug.h"
39 #include "cifs_fs_sb.h"
40 #include <linux/mm.h>
41 #include <linux/key-type.h>
42 #include "cifs_spnego.h"
43 #include "fscache.h"
44 #ifdef CONFIG_CIFS_DFS_UPCALL
45 #include "dfs_cache.h"
46 #endif
47 #ifdef CONFIG_CIFS_SWN_UPCALL
48 #include "netlink.h"
49 #endif
50 #include "fs_context.h"
51 #include "cached_dir.h"
52
53 /*
54 * DOS dates from 1980/1/1 through 2107/12/31
55 * Protocol specifications indicate the range should be to 119, which
56 * limits maximum year to 2099. But this range has not been checked.
57 */
58 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
59 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
60 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
61
62 int cifsFYI = 0;
63 bool traceSMB;
64 bool enable_oplocks = true;
65 bool linuxExtEnabled = true;
66 bool lookupCacheEnabled = true;
67 bool disable_legacy_dialects; /* false by default */
68 bool enable_gcm_256 = true;
69 bool require_gcm_256; /* false by default */
70 bool enable_negotiate_signing; /* false by default */
71 unsigned int global_secflags = CIFSSEC_DEF;
72 /* unsigned int ntlmv2_support = 0; */
73
74 /*
75 * Global transaction id (XID) information
76 */
77 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */
78 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */
79 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */
80 DEFINE_SPINLOCK(GlobalMid_Lock); /* protects above & list operations on midQ entries */
81
82 /*
83 * Global counters, updated atomically
84 */
85 atomic_t sesInfoAllocCount;
86 atomic_t tconInfoAllocCount;
87 atomic_t tcpSesNextId;
88 atomic_t tcpSesAllocCount;
89 atomic_t tcpSesReconnectCount;
90 atomic_t tconInfoReconnectCount;
91
92 atomic_t mid_count;
93 atomic_t buf_alloc_count;
94 atomic_t small_buf_alloc_count;
95 #ifdef CONFIG_CIFS_STATS2
96 atomic_t total_buf_alloc_count;
97 atomic_t total_small_buf_alloc_count;
98 #endif/* STATS2 */
99 struct list_head cifs_tcp_ses_list;
100 DEFINE_SPINLOCK(cifs_tcp_ses_lock);
101 static const struct super_operations cifs_super_ops;
102 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
103 module_param(CIFSMaxBufSize, uint, 0444);
104 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
105 "for CIFS requests. "
106 "Default: 16384 Range: 8192 to 130048");
107 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
108 module_param(cifs_min_rcv, uint, 0444);
109 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
110 "1 to 64");
111 unsigned int cifs_min_small = 30;
112 module_param(cifs_min_small, uint, 0444);
113 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
114 "Range: 2 to 256");
115 unsigned int cifs_max_pending = CIFS_MAX_REQ;
116 module_param(cifs_max_pending, uint, 0444);
117 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
118 "CIFS/SMB1 dialect (N/A for SMB3) "
119 "Default: 32767 Range: 2 to 32767.");
120 unsigned int dir_cache_timeout = 30;
121 module_param(dir_cache_timeout, uint, 0644);
122 MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 "
123 "Range: 1 to 65000 seconds, 0 to disable caching dir contents");
124 /* Module-wide total cached dirents (in bytes) across all tcons */
125 atomic64_t cifs_dircache_bytes_used = ATOMIC64_INIT(0);
126
127 /*
128 * Write-only module parameter to drop all cached directory entries across
129 * all CIFS mounts. Echo a non-zero value to trigger.
130 */
cifs_drop_all_dir_caches(void)131 static void cifs_drop_all_dir_caches(void)
132 {
133 struct TCP_Server_Info *server;
134 struct cifs_ses *ses;
135 struct cifs_tcon *tcon;
136
137 spin_lock(&cifs_tcp_ses_lock);
138 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
139 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
140 if (cifs_ses_exiting(ses))
141 continue;
142 list_for_each_entry(tcon, &ses->tcon_list, tcon_list)
143 invalidate_all_cached_dirs(tcon);
144 }
145 }
146 spin_unlock(&cifs_tcp_ses_lock);
147 }
148
cifs_param_set_drop_dir_cache(const char * val,const struct kernel_param * kp)149 static int cifs_param_set_drop_dir_cache(const char *val, const struct kernel_param *kp)
150 {
151 bool bv;
152 int rc = kstrtobool(val, &bv);
153
154 if (rc)
155 return rc;
156 if (bv)
157 cifs_drop_all_dir_caches();
158 return 0;
159 }
160
161 module_param_call(drop_dir_cache, cifs_param_set_drop_dir_cache, NULL, NULL, 0200);
162 MODULE_PARM_DESC(drop_dir_cache, "Write 1 to drop all cached directory entries across all CIFS mounts");
163
164 #ifdef CONFIG_CIFS_STATS2
165 unsigned int slow_rsp_threshold = 1;
166 module_param(slow_rsp_threshold, uint, 0644);
167 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
168 "before logging that a response is delayed. "
169 "Default: 1 (if set to 0 disables msg).");
170 #endif /* STATS2 */
171
172 module_param(enable_oplocks, bool, 0644);
173 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
174
175 module_param(enable_gcm_256, bool, 0644);
176 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: y/Y/1");
177
178 module_param(require_gcm_256, bool, 0644);
179 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
180
181 module_param(enable_negotiate_signing, bool, 0644);
182 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
183
184 module_param(disable_legacy_dialects, bool, 0644);
185 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
186 "helpful to restrict the ability to "
187 "override the default dialects (SMB2.1, "
188 "SMB3 and SMB3.02) on mount with old "
189 "dialects (CIFS/SMB1 and SMB2) since "
190 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
191 " and less secure. Default: n/N/0");
192
193 struct workqueue_struct *cifsiod_wq;
194 struct workqueue_struct *decrypt_wq;
195 struct workqueue_struct *fileinfo_put_wq;
196 struct workqueue_struct *cifsoplockd_wq;
197 struct workqueue_struct *deferredclose_wq;
198 struct workqueue_struct *serverclose_wq;
199 struct workqueue_struct *cfid_put_wq;
200 __u32 cifs_lock_secret;
201
202 /*
203 * Bumps refcount for cifs super block.
204 * Note that it should be only called if a reference to VFS super block is
205 * already held, e.g. in open-type syscalls context. Otherwise it can race with
206 * atomic_dec_and_test in deactivate_locked_super.
207 */
208 void
cifs_sb_active(struct super_block * sb)209 cifs_sb_active(struct super_block *sb)
210 {
211 struct cifs_sb_info *server = CIFS_SB(sb);
212
213 if (atomic_inc_return(&server->active) == 1)
214 atomic_inc(&sb->s_active);
215 }
216
217 void
cifs_sb_deactive(struct super_block * sb)218 cifs_sb_deactive(struct super_block *sb)
219 {
220 struct cifs_sb_info *server = CIFS_SB(sb);
221
222 if (atomic_dec_and_test(&server->active))
223 deactivate_super(sb);
224 }
225
226 static int
cifs_read_super(struct super_block * sb)227 cifs_read_super(struct super_block *sb)
228 {
229 struct inode *inode;
230 struct cifs_sb_info *cifs_sb;
231 struct cifs_tcon *tcon;
232 struct timespec64 ts;
233 int rc = 0;
234
235 cifs_sb = CIFS_SB(sb);
236 tcon = cifs_sb_master_tcon(cifs_sb);
237
238 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
239 sb->s_flags |= SB_POSIXACL;
240
241 if (tcon->snapshot_time)
242 sb->s_flags |= SB_RDONLY;
243
244 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
245 sb->s_maxbytes = MAX_LFS_FILESIZE;
246 else
247 sb->s_maxbytes = MAX_NON_LFS;
248
249 /*
250 * Some very old servers like DOS and OS/2 used 2 second granularity
251 * (while all current servers use 100ns granularity - see MS-DTYP)
252 * but 1 second is the maximum allowed granularity for the VFS
253 * so for old servers set time granularity to 1 second while for
254 * everything else (current servers) set it to 100ns.
255 */
256 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
257 ((tcon->ses->capabilities &
258 tcon->ses->server->vals->cap_nt_find) == 0) &&
259 !tcon->unix_ext) {
260 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
261 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
262 sb->s_time_min = ts.tv_sec;
263 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
264 cpu_to_le16(SMB_TIME_MAX), 0);
265 sb->s_time_max = ts.tv_sec;
266 } else {
267 /*
268 * Almost every server, including all SMB2+, uses DCE TIME
269 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
270 */
271 sb->s_time_gran = 100;
272 ts = cifs_NTtimeToUnix(0);
273 sb->s_time_min = ts.tv_sec;
274 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
275 sb->s_time_max = ts.tv_sec;
276 }
277
278 sb->s_magic = CIFS_SUPER_MAGIC;
279 sb->s_op = &cifs_super_ops;
280 sb->s_xattr = cifs_xattr_handlers;
281 rc = super_setup_bdi(sb);
282 if (rc)
283 goto out_no_root;
284 /* tune readahead according to rsize if readahead size not set on mount */
285 if (cifs_sb->ctx->rsize == 0)
286 cifs_sb->ctx->rsize =
287 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
288 if (cifs_sb->ctx->rasize)
289 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
290 else
291 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
292
293 sb->s_blocksize = CIFS_MAX_MSGSIZE;
294 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
295 inode = cifs_root_iget(sb);
296
297 if (IS_ERR(inode)) {
298 rc = PTR_ERR(inode);
299 goto out_no_root;
300 }
301
302 if (tcon->nocase)
303 set_default_d_op(sb, &cifs_ci_dentry_ops);
304 else
305 set_default_d_op(sb, &cifs_dentry_ops);
306
307 sb->s_root = d_make_root(inode);
308 if (!sb->s_root) {
309 rc = -ENOMEM;
310 goto out_no_root;
311 }
312
313 #ifdef CONFIG_CIFS_NFSD_EXPORT
314 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
315 cifs_dbg(FYI, "export ops supported\n");
316 sb->s_export_op = &cifs_export_ops;
317 }
318 #endif /* CONFIG_CIFS_NFSD_EXPORT */
319
320 return 0;
321
322 out_no_root:
323 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
324 return rc;
325 }
326
cifs_kill_sb(struct super_block * sb)327 static void cifs_kill_sb(struct super_block *sb)
328 {
329 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
330
331 /*
332 * We need to release all dentries for the cached directories
333 * before we kill the sb.
334 */
335 if (cifs_sb->root) {
336 close_all_cached_dirs(cifs_sb);
337
338 /* finally release root dentry */
339 dput(cifs_sb->root);
340 cifs_sb->root = NULL;
341 }
342
343 kill_anon_super(sb);
344 cifs_umount(cifs_sb);
345 }
346
347 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)348 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
349 {
350 struct super_block *sb = dentry->d_sb;
351 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
352 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
353 struct TCP_Server_Info *server = tcon->ses->server;
354 unsigned int xid;
355 int rc = 0;
356 const char *full_path;
357 void *page;
358
359 xid = get_xid();
360 page = alloc_dentry_path();
361
362 full_path = build_path_from_dentry(dentry, page);
363 if (IS_ERR(full_path)) {
364 rc = PTR_ERR(full_path);
365 goto statfs_out;
366 }
367
368 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
369 buf->f_namelen =
370 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
371 else
372 buf->f_namelen = PATH_MAX;
373
374 buf->f_fsid.val[0] = tcon->vol_serial_number;
375 /* are using part of create time for more randomness, see man statfs */
376 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
377
378 buf->f_files = 0; /* undefined */
379 buf->f_ffree = 0; /* unlimited */
380
381 if (server->ops->queryfs)
382 rc = server->ops->queryfs(xid, tcon, full_path, cifs_sb, buf);
383
384 statfs_out:
385 free_dentry_path(page);
386 free_xid(xid);
387 return rc;
388 }
389
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)390 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
391 {
392 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
393 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
394 struct TCP_Server_Info *server = tcon->ses->server;
395 struct inode *inode = file_inode(file);
396 int rc;
397
398 if (!server->ops->fallocate)
399 return -EOPNOTSUPP;
400
401 rc = inode_lock_killable(inode);
402 if (rc)
403 return rc;
404
405 netfs_wait_for_outstanding_io(inode);
406
407 rc = file_modified(file);
408 if (rc)
409 goto out_unlock;
410
411 rc = server->ops->fallocate(file, tcon, mode, off, len);
412
413 out_unlock:
414 inode_unlock(inode);
415 return rc;
416 }
417
cifs_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)418 static int cifs_permission(struct mnt_idmap *idmap,
419 struct inode *inode, int mask)
420 {
421 struct cifs_sb_info *cifs_sb;
422
423 cifs_sb = CIFS_SB(inode->i_sb);
424
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
426 if ((mask & MAY_EXEC) && !execute_ok(inode))
427 return -EACCES;
428 else
429 return 0;
430 } else /* file mode might have been restricted at mount time
431 on the client (above and beyond ACL on servers) for
432 servers which do not support setting and viewing mode bits,
433 so allowing client to check permissions is useful */
434 return generic_permission(&nop_mnt_idmap, inode, mask);
435 }
436
437 static struct kmem_cache *cifs_inode_cachep;
438 static struct kmem_cache *cifs_req_cachep;
439 static struct kmem_cache *cifs_mid_cachep;
440 static struct kmem_cache *cifs_sm_req_cachep;
441 static struct kmem_cache *cifs_io_request_cachep;
442 static struct kmem_cache *cifs_io_subrequest_cachep;
443 mempool_t *cifs_sm_req_poolp;
444 mempool_t *cifs_req_poolp;
445 mempool_t *cifs_mid_poolp;
446 mempool_t cifs_io_request_pool;
447 mempool_t cifs_io_subrequest_pool;
448
449 static struct inode *
cifs_alloc_inode(struct super_block * sb)450 cifs_alloc_inode(struct super_block *sb)
451 {
452 struct cifsInodeInfo *cifs_inode;
453 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
454 if (!cifs_inode)
455 return NULL;
456 cifs_inode->cifsAttrs = ATTR_ARCHIVE; /* default */
457 cifs_inode->time = 0;
458 /*
459 * Until the file is open and we have gotten oplock info back from the
460 * server, can not assume caching of file data or metadata.
461 */
462 cifs_set_oplock_level(cifs_inode, 0);
463 cifs_inode->lease_granted = false;
464 cifs_inode->flags = 0;
465 spin_lock_init(&cifs_inode->writers_lock);
466 cifs_inode->writers = 0;
467 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
468 cifs_inode->netfs.remote_i_size = 0;
469 cifs_inode->uniqueid = 0;
470 cifs_inode->createtime = 0;
471 cifs_inode->epoch = 0;
472 spin_lock_init(&cifs_inode->open_file_lock);
473 generate_random_uuid(cifs_inode->lease_key);
474 cifs_inode->symlink_target = NULL;
475
476 /*
477 * Can not set i_flags here - they get immediately overwritten to zero
478 * by the VFS.
479 */
480 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
481 INIT_LIST_HEAD(&cifs_inode->openFileList);
482 INIT_LIST_HEAD(&cifs_inode->llist);
483 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
484 spin_lock_init(&cifs_inode->deferred_lock);
485 return &cifs_inode->netfs.inode;
486 }
487
488 static void
cifs_free_inode(struct inode * inode)489 cifs_free_inode(struct inode *inode)
490 {
491 struct cifsInodeInfo *cinode = CIFS_I(inode);
492
493 if (S_ISLNK(inode->i_mode))
494 kfree(cinode->symlink_target);
495 kmem_cache_free(cifs_inode_cachep, cinode);
496 }
497
498 static void
cifs_evict_inode(struct inode * inode)499 cifs_evict_inode(struct inode *inode)
500 {
501 netfs_wait_for_outstanding_io(inode);
502 truncate_inode_pages_final(&inode->i_data);
503 if (inode_state_read_once(inode) & I_PINNING_NETFS_WB)
504 cifs_fscache_unuse_inode_cookie(inode, true);
505 cifs_fscache_release_inode_cookie(inode);
506 clear_inode(inode);
507 }
508
509 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)510 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
511 {
512 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
513 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
514
515 seq_puts(s, ",addr=");
516
517 switch (server->dstaddr.ss_family) {
518 case AF_INET:
519 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
520 break;
521 case AF_INET6:
522 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
523 if (sa6->sin6_scope_id)
524 seq_printf(s, "%%%u", sa6->sin6_scope_id);
525 break;
526 default:
527 seq_puts(s, "(unknown)");
528 }
529 if (server->rdma)
530 seq_puts(s, ",rdma");
531 }
532
533 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)534 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
535 {
536 if (ses->sectype == Unspecified) {
537 if (ses->user_name == NULL)
538 seq_puts(s, ",sec=none");
539 return;
540 }
541
542 seq_puts(s, ",sec=");
543
544 switch (ses->sectype) {
545 case NTLMv2:
546 seq_puts(s, "ntlmv2");
547 break;
548 case Kerberos:
549 seq_puts(s, "krb5");
550 break;
551 case RawNTLMSSP:
552 seq_puts(s, "ntlmssp");
553 break;
554 default:
555 /* shouldn't ever happen */
556 seq_puts(s, "unknown");
557 break;
558 }
559
560 if (ses->sign)
561 seq_puts(s, "i");
562
563 if (ses->sectype == Kerberos)
564 seq_printf(s, ",cruid=%u",
565 from_kuid_munged(&init_user_ns, ses->cred_uid));
566 }
567
568 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)569 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
570 {
571 seq_puts(s, ",cache=");
572
573 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
574 seq_puts(s, "strict");
575 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
576 seq_puts(s, "none");
577 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
578 seq_puts(s, "singleclient"); /* assume only one client access */
579 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
580 seq_puts(s, "ro"); /* read only caching assumed */
581 else
582 seq_puts(s, "loose");
583 }
584
585 /*
586 * cifs_show_devname() is used so we show the mount device name with correct
587 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
588 */
cifs_show_devname(struct seq_file * m,struct dentry * root)589 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
590 {
591 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
592 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
593
594 if (devname == NULL)
595 seq_puts(m, "none");
596 else {
597 convert_delimiter(devname, '/');
598 /* escape all spaces in share names */
599 seq_escape(m, devname, " \t");
600 kfree(devname);
601 }
602 return 0;
603 }
604
605 static void
cifs_show_upcall_target(struct seq_file * s,struct cifs_sb_info * cifs_sb)606 cifs_show_upcall_target(struct seq_file *s, struct cifs_sb_info *cifs_sb)
607 {
608 if (cifs_sb->ctx->upcall_target == UPTARGET_UNSPECIFIED) {
609 seq_puts(s, ",upcall_target=app");
610 return;
611 }
612
613 seq_puts(s, ",upcall_target=");
614
615 switch (cifs_sb->ctx->upcall_target) {
616 case UPTARGET_APP:
617 seq_puts(s, "app");
618 break;
619 case UPTARGET_MOUNT:
620 seq_puts(s, "mount");
621 break;
622 default:
623 /* shouldn't ever happen */
624 seq_puts(s, "unknown");
625 break;
626 }
627 }
628
629 /*
630 * cifs_show_options() is for displaying mount options in /proc/mounts.
631 * Not all settable options are displayed but most of the important
632 * ones are.
633 */
634 static int
cifs_show_options(struct seq_file * s,struct dentry * root)635 cifs_show_options(struct seq_file *s, struct dentry *root)
636 {
637 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
638 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
639 struct sockaddr *srcaddr;
640 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
641
642 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
643 cifs_show_security(s, tcon->ses);
644 cifs_show_cache_flavor(s, cifs_sb);
645 cifs_show_upcall_target(s, cifs_sb);
646
647 if (tcon->no_lease)
648 seq_puts(s, ",nolease");
649 if (cifs_sb->ctx->multiuser)
650 seq_puts(s, ",multiuser");
651 else if (tcon->ses->user_name)
652 seq_show_option(s, "username", tcon->ses->user_name);
653
654 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
655 seq_show_option(s, "domain", tcon->ses->domainName);
656
657 if (srcaddr->sa_family != AF_UNSPEC) {
658 struct sockaddr_in *saddr4;
659 struct sockaddr_in6 *saddr6;
660 saddr4 = (struct sockaddr_in *)srcaddr;
661 saddr6 = (struct sockaddr_in6 *)srcaddr;
662 if (srcaddr->sa_family == AF_INET6)
663 seq_printf(s, ",srcaddr=%pI6c",
664 &saddr6->sin6_addr);
665 else if (srcaddr->sa_family == AF_INET)
666 seq_printf(s, ",srcaddr=%pI4",
667 &saddr4->sin_addr.s_addr);
668 else
669 seq_printf(s, ",srcaddr=BAD-AF:%i",
670 (int)(srcaddr->sa_family));
671 }
672
673 seq_printf(s, ",uid=%u",
674 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
675 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
676 seq_puts(s, ",forceuid");
677 else
678 seq_puts(s, ",noforceuid");
679
680 seq_printf(s, ",gid=%u",
681 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
682 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
683 seq_puts(s, ",forcegid");
684 else
685 seq_puts(s, ",noforcegid");
686
687 cifs_show_address(s, tcon->ses->server);
688
689 if (!tcon->unix_ext)
690 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
691 cifs_sb->ctx->file_mode,
692 cifs_sb->ctx->dir_mode);
693 if (cifs_sb->ctx->iocharset)
694 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
695 if (tcon->ses->unicode == 0)
696 seq_puts(s, ",nounicode");
697 else if (tcon->ses->unicode == 1)
698 seq_puts(s, ",unicode");
699 if (tcon->seal)
700 seq_puts(s, ",seal");
701 else if (tcon->ses->server->ignore_signature)
702 seq_puts(s, ",signloosely");
703 if (tcon->nocase)
704 seq_puts(s, ",nocase");
705 if (tcon->nodelete)
706 seq_puts(s, ",nodelete");
707 if (cifs_sb->ctx->no_sparse)
708 seq_puts(s, ",nosparse");
709 if (tcon->local_lease)
710 seq_puts(s, ",locallease");
711 if (tcon->retry)
712 seq_puts(s, ",hard");
713 else
714 seq_puts(s, ",soft");
715 if (tcon->use_persistent)
716 seq_puts(s, ",persistenthandles");
717 else if (tcon->use_resilient)
718 seq_puts(s, ",resilienthandles");
719 if (tcon->posix_extensions)
720 seq_puts(s, ",posix");
721 else if (tcon->unix_ext)
722 seq_puts(s, ",unix");
723 else
724 seq_puts(s, ",nounix");
725 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
726 seq_puts(s, ",nodfs");
727 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
728 seq_puts(s, ",posixpaths");
729 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
730 seq_puts(s, ",setuids");
731 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
732 seq_puts(s, ",idsfromsid");
733 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
734 seq_puts(s, ",serverino");
735 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
736 seq_puts(s, ",rwpidforward");
737 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
738 seq_puts(s, ",forcemand");
739 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
740 seq_puts(s, ",nouser_xattr");
741 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
742 seq_puts(s, ",mapchars");
743 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
744 seq_puts(s, ",mapposix");
745 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
746 seq_puts(s, ",sfu");
747 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
748 seq_puts(s, ",nobrl");
749 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
750 seq_puts(s, ",nohandlecache");
751 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
752 seq_puts(s, ",modefromsid");
753 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
754 seq_puts(s, ",cifsacl");
755 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
756 seq_puts(s, ",dynperm");
757 if (root->d_sb->s_flags & SB_POSIXACL)
758 seq_puts(s, ",acl");
759 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
760 seq_puts(s, ",mfsymlinks");
761 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
762 seq_puts(s, ",fsc");
763 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
764 seq_puts(s, ",nostrictsync");
765 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
766 seq_puts(s, ",noperm");
767 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
768 seq_printf(s, ",backupuid=%u",
769 from_kuid_munged(&init_user_ns,
770 cifs_sb->ctx->backupuid));
771 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
772 seq_printf(s, ",backupgid=%u",
773 from_kgid_munged(&init_user_ns,
774 cifs_sb->ctx->backupgid));
775 seq_show_option(s, "reparse",
776 cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
777 if (cifs_sb->ctx->nonativesocket)
778 seq_puts(s, ",nonativesocket");
779 else
780 seq_puts(s, ",nativesocket");
781 seq_show_option(s, "symlink",
782 cifs_symlink_type_str(cifs_symlink_type(cifs_sb)));
783
784 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
785 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
786 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
787 if (cifs_sb->ctx->rasize)
788 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
789 if (tcon->ses->server->min_offload)
790 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
791 if (tcon->ses->server->retrans)
792 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans);
793 seq_printf(s, ",echo_interval=%lu",
794 tcon->ses->server->echo_interval / HZ);
795
796 /* Only display the following if overridden on mount */
797 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
798 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
799 if (tcon->ses->server->tcp_nodelay)
800 seq_puts(s, ",tcpnodelay");
801 if (tcon->ses->server->noautotune)
802 seq_puts(s, ",noautotune");
803 if (tcon->ses->server->noblocksnd)
804 seq_puts(s, ",noblocksend");
805 if (tcon->ses->server->nosharesock)
806 seq_puts(s, ",nosharesock");
807
808 if (tcon->snapshot_time)
809 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
810 if (tcon->handle_timeout)
811 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
812 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
813 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
814
815 /*
816 * Display file and directory attribute timeout in seconds.
817 * If file and directory attribute timeout the same then actimeo
818 * was likely specified on mount
819 */
820 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
821 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
822 else {
823 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
824 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
825 }
826 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
827
828 if (tcon->ses->chan_max > 1)
829 seq_printf(s, ",multichannel,max_channels=%zu",
830 tcon->ses->chan_max);
831
832 if (tcon->use_witness)
833 seq_puts(s, ",witness");
834
835 return 0;
836 }
837
cifs_umount_begin(struct super_block * sb)838 static void cifs_umount_begin(struct super_block *sb)
839 {
840 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
841 struct cifs_tcon *tcon;
842
843 if (cifs_sb == NULL)
844 return;
845
846 tcon = cifs_sb_master_tcon(cifs_sb);
847
848 spin_lock(&cifs_tcp_ses_lock);
849 spin_lock(&tcon->tc_lock);
850 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
851 netfs_trace_tcon_ref_see_umount);
852 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
853 /* we have other mounts to same share or we have
854 already tried to umount this and woken up
855 all waiting network requests, nothing to do */
856 spin_unlock(&tcon->tc_lock);
857 spin_unlock(&cifs_tcp_ses_lock);
858 return;
859 }
860 /*
861 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
862 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
863 */
864 spin_unlock(&tcon->tc_lock);
865 spin_unlock(&cifs_tcp_ses_lock);
866
867 cifs_close_all_deferred_files(tcon);
868 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
869 /* cancel_notify_requests(tcon); */
870 if (tcon->ses && tcon->ses->server) {
871 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
872 wake_up_all(&tcon->ses->server->request_q);
873 wake_up_all(&tcon->ses->server->response_q);
874 msleep(1); /* yield */
875 /* we have to kick the requests once more */
876 wake_up_all(&tcon->ses->server->response_q);
877 msleep(1);
878 }
879
880 return;
881 }
882
cifs_freeze(struct super_block * sb)883 static int cifs_freeze(struct super_block *sb)
884 {
885 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
886 struct cifs_tcon *tcon;
887
888 if (cifs_sb == NULL)
889 return 0;
890
891 tcon = cifs_sb_master_tcon(cifs_sb);
892
893 cifs_close_all_deferred_files(tcon);
894 return 0;
895 }
896
897 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)898 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
899 {
900 /* BB FIXME */
901 return 0;
902 }
903 #endif
904
cifs_write_inode(struct inode * inode,struct writeback_control * wbc)905 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
906 {
907 return netfs_unpin_writeback(inode, wbc);
908 }
909
cifs_drop_inode(struct inode * inode)910 static int cifs_drop_inode(struct inode *inode)
911 {
912 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
913
914 /* no serverino => unconditional eviction */
915 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
916 inode_generic_drop(inode);
917 }
918
919 static const struct super_operations cifs_super_ops = {
920 .statfs = cifs_statfs,
921 .alloc_inode = cifs_alloc_inode,
922 .write_inode = cifs_write_inode,
923 .free_inode = cifs_free_inode,
924 .drop_inode = cifs_drop_inode,
925 .evict_inode = cifs_evict_inode,
926 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
927 .show_devname = cifs_show_devname,
928 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
929 function unless later we add lazy close of inodes or unless the
930 kernel forgets to call us with the same number of releases (closes)
931 as opens */
932 .show_options = cifs_show_options,
933 .umount_begin = cifs_umount_begin,
934 .freeze_fs = cifs_freeze,
935 #ifdef CONFIG_CIFS_STATS2
936 .show_stats = cifs_show_stats,
937 #endif
938 };
939
940 /*
941 * Get root dentry from superblock according to prefix path mount option.
942 * Return dentry with refcount + 1 on success and NULL otherwise.
943 */
944 static struct dentry *
cifs_get_root(struct smb3_fs_context * ctx,struct super_block * sb)945 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
946 {
947 struct dentry *dentry;
948 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
949 char *full_path = NULL;
950 char *s, *p;
951 char sep;
952
953 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
954 return dget(sb->s_root);
955
956 full_path = cifs_build_path_to_root(ctx, cifs_sb,
957 cifs_sb_master_tcon(cifs_sb), 0);
958 if (full_path == NULL)
959 return ERR_PTR(-ENOMEM);
960
961 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
962
963 sep = CIFS_DIR_SEP(cifs_sb);
964 dentry = dget(sb->s_root);
965 s = full_path;
966
967 do {
968 struct inode *dir = d_inode(dentry);
969 struct dentry *child;
970
971 if (!S_ISDIR(dir->i_mode)) {
972 dput(dentry);
973 dentry = ERR_PTR(-ENOTDIR);
974 break;
975 }
976
977 /* skip separators */
978 while (*s == sep)
979 s++;
980 if (!*s)
981 break;
982 p = s++;
983 /* next separator */
984 while (*s && *s != sep)
985 s++;
986
987 child = lookup_noperm_positive_unlocked(&QSTR_LEN(p, s - p),
988 dentry);
989 dput(dentry);
990 dentry = child;
991 } while (!IS_ERR(dentry));
992 kfree(full_path);
993 return dentry;
994 }
995
cifs_set_super(struct super_block * sb,void * data)996 static int cifs_set_super(struct super_block *sb, void *data)
997 {
998 struct cifs_mnt_data *mnt_data = data;
999 sb->s_fs_info = mnt_data->cifs_sb;
1000 return set_anon_super(sb, NULL);
1001 }
1002
1003 struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,struct smb3_fs_context * old_ctx)1004 cifs_smb3_do_mount(struct file_system_type *fs_type,
1005 int flags, struct smb3_fs_context *old_ctx)
1006 {
1007 struct cifs_mnt_data mnt_data;
1008 struct cifs_sb_info *cifs_sb;
1009 struct super_block *sb;
1010 struct dentry *root;
1011 int rc;
1012
1013 if (cifsFYI) {
1014 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
1015 old_ctx->source, flags);
1016 } else {
1017 cifs_info("Attempting to mount %s\n", old_ctx->source);
1018 }
1019
1020 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
1021 if (!cifs_sb)
1022 return ERR_PTR(-ENOMEM);
1023
1024 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
1025 if (!cifs_sb->ctx) {
1026 root = ERR_PTR(-ENOMEM);
1027 goto out;
1028 }
1029 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
1030 if (rc) {
1031 root = ERR_PTR(rc);
1032 goto out;
1033 }
1034
1035 rc = cifs_setup_cifs_sb(cifs_sb);
1036 if (rc) {
1037 root = ERR_PTR(rc);
1038 goto out;
1039 }
1040
1041 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
1042 if (rc) {
1043 if (!(flags & SB_SILENT))
1044 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
1045 rc);
1046 root = ERR_PTR(rc);
1047 goto out;
1048 }
1049
1050 mnt_data.ctx = cifs_sb->ctx;
1051 mnt_data.cifs_sb = cifs_sb;
1052 mnt_data.flags = flags;
1053
1054 /* BB should we make this contingent on mount parm? */
1055 flags |= SB_NODIRATIME | SB_NOATIME;
1056
1057 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
1058 if (IS_ERR(sb)) {
1059 cifs_umount(cifs_sb);
1060 return ERR_CAST(sb);
1061 }
1062
1063 if (sb->s_root) {
1064 cifs_dbg(FYI, "Use existing superblock\n");
1065 cifs_umount(cifs_sb);
1066 cifs_sb = NULL;
1067 } else {
1068 rc = cifs_read_super(sb);
1069 if (rc) {
1070 root = ERR_PTR(rc);
1071 goto out_super;
1072 }
1073
1074 sb->s_flags |= SB_ACTIVE;
1075 }
1076
1077 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
1078 if (IS_ERR(root))
1079 goto out_super;
1080
1081 if (cifs_sb)
1082 cifs_sb->root = dget(root);
1083
1084 cifs_dbg(FYI, "dentry root is: %p\n", root);
1085 return root;
1086
1087 out_super:
1088 deactivate_locked_super(sb);
1089 return root;
1090 out:
1091 kfree(cifs_sb->prepath);
1092 smb3_cleanup_fs_context(cifs_sb->ctx);
1093 kfree(cifs_sb);
1094 return root;
1095 }
1096
cifs_llseek(struct file * file,loff_t offset,int whence)1097 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
1098 {
1099 struct cifsFileInfo *cfile = file->private_data;
1100 struct cifs_tcon *tcon;
1101
1102 /*
1103 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1104 * the cached file length
1105 */
1106 if (whence != SEEK_SET && whence != SEEK_CUR) {
1107 int rc;
1108 struct inode *inode = file_inode(file);
1109
1110 /*
1111 * We need to be sure that all dirty pages are written and the
1112 * server has the newest file length.
1113 */
1114 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1115 inode->i_mapping->nrpages != 0) {
1116 rc = filemap_fdatawait(inode->i_mapping);
1117 if (rc) {
1118 mapping_set_error(inode->i_mapping, rc);
1119 return rc;
1120 }
1121 }
1122 /*
1123 * Some applications poll for the file length in this strange
1124 * way so we must seek to end on non-oplocked files by
1125 * setting the revalidate time to zero.
1126 */
1127 CIFS_I(inode)->time = 0;
1128
1129 rc = cifs_revalidate_file_attr(file);
1130 if (rc < 0)
1131 return (loff_t)rc;
1132 }
1133 if (cfile && cfile->tlink) {
1134 tcon = tlink_tcon(cfile->tlink);
1135 if (tcon->ses->server->ops->llseek)
1136 return tcon->ses->server->ops->llseek(file, tcon,
1137 offset, whence);
1138 }
1139 return generic_file_llseek(file, offset, whence);
1140 }
1141
1142 static int
cifs_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)1143 cifs_setlease(struct file *file, int arg, struct file_lease **lease, void **priv)
1144 {
1145 /*
1146 * Note that this is called by vfs setlease with i_lock held to
1147 * protect *lease from going away.
1148 */
1149 struct inode *inode = file_inode(file);
1150 struct cifsFileInfo *cfile = file->private_data;
1151
1152 if (!S_ISREG(inode->i_mode))
1153 return -EINVAL;
1154
1155 /* Check if file is oplocked if this is request for new lease */
1156 if (arg == F_UNLCK ||
1157 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1158 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1159 return generic_setlease(file, arg, lease, priv);
1160 else if (tlink_tcon(cfile->tlink)->local_lease &&
1161 !CIFS_CACHE_READ(CIFS_I(inode)))
1162 /*
1163 * If the server claims to support oplock on this file, then we
1164 * still need to check oplock even if the local_lease mount
1165 * option is set, but there are servers which do not support
1166 * oplock for which this mount option may be useful if the user
1167 * knows that the file won't be changed on the server by anyone
1168 * else.
1169 */
1170 return generic_setlease(file, arg, lease, priv);
1171 else
1172 return -EAGAIN;
1173 }
1174
1175 struct file_system_type cifs_fs_type = {
1176 .owner = THIS_MODULE,
1177 .name = "cifs",
1178 .init_fs_context = smb3_init_fs_context,
1179 .parameters = smb3_fs_parameters,
1180 .kill_sb = cifs_kill_sb,
1181 .fs_flags = FS_RENAME_DOES_D_MOVE,
1182 };
1183 MODULE_ALIAS_FS("cifs");
1184
1185 struct file_system_type smb3_fs_type = {
1186 .owner = THIS_MODULE,
1187 .name = "smb3",
1188 .init_fs_context = smb3_init_fs_context,
1189 .parameters = smb3_fs_parameters,
1190 .kill_sb = cifs_kill_sb,
1191 .fs_flags = FS_RENAME_DOES_D_MOVE,
1192 };
1193 MODULE_ALIAS_FS("smb3");
1194 MODULE_ALIAS("smb3");
1195
1196 const struct inode_operations cifs_dir_inode_ops = {
1197 .create = cifs_create,
1198 .atomic_open = cifs_atomic_open,
1199 .lookup = cifs_lookup,
1200 .getattr = cifs_getattr,
1201 .unlink = cifs_unlink,
1202 .link = cifs_hardlink,
1203 .mkdir = cifs_mkdir,
1204 .rmdir = cifs_rmdir,
1205 .rename = cifs_rename2,
1206 .permission = cifs_permission,
1207 .setattr = cifs_setattr,
1208 .symlink = cifs_symlink,
1209 .mknod = cifs_mknod,
1210 .listxattr = cifs_listxattr,
1211 .get_acl = cifs_get_acl,
1212 .set_acl = cifs_set_acl,
1213 };
1214
1215 const struct inode_operations cifs_file_inode_ops = {
1216 .setattr = cifs_setattr,
1217 .getattr = cifs_getattr,
1218 .permission = cifs_permission,
1219 .listxattr = cifs_listxattr,
1220 .fiemap = cifs_fiemap,
1221 .get_acl = cifs_get_acl,
1222 .set_acl = cifs_set_acl,
1223 };
1224
cifs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1225 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1226 struct delayed_call *done)
1227 {
1228 char *target_path;
1229
1230 if (!dentry)
1231 return ERR_PTR(-ECHILD);
1232
1233 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1234 if (!target_path)
1235 return ERR_PTR(-ENOMEM);
1236
1237 spin_lock(&inode->i_lock);
1238 if (likely(CIFS_I(inode)->symlink_target)) {
1239 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1240 } else {
1241 kfree(target_path);
1242 target_path = ERR_PTR(-EOPNOTSUPP);
1243 }
1244 spin_unlock(&inode->i_lock);
1245
1246 if (!IS_ERR(target_path))
1247 set_delayed_call(done, kfree_link, target_path);
1248
1249 return target_path;
1250 }
1251
1252 const struct inode_operations cifs_symlink_inode_ops = {
1253 .get_link = cifs_get_link,
1254 .setattr = cifs_setattr,
1255 .permission = cifs_permission,
1256 .listxattr = cifs_listxattr,
1257 };
1258
1259 /*
1260 * Advance the EOF marker to after the source range.
1261 */
cifs_precopy_set_eof(struct inode * src_inode,struct cifsInodeInfo * src_cifsi,struct cifs_tcon * src_tcon,unsigned int xid,loff_t src_end)1262 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1263 struct cifs_tcon *src_tcon,
1264 unsigned int xid, loff_t src_end)
1265 {
1266 struct cifsFileInfo *writeable_srcfile;
1267 int rc = -EINVAL;
1268
1269 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1270 if (writeable_srcfile) {
1271 if (src_tcon->ses->server->ops->set_file_size)
1272 rc = src_tcon->ses->server->ops->set_file_size(
1273 xid, src_tcon, writeable_srcfile,
1274 src_inode->i_size, true /* no need to set sparse */);
1275 else
1276 rc = -ENOSYS;
1277 cifsFileInfo_put(writeable_srcfile);
1278 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1279 }
1280
1281 if (rc < 0)
1282 goto set_failed;
1283
1284 netfs_resize_file(&src_cifsi->netfs, src_end, true);
1285 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1286 return 0;
1287
1288 set_failed:
1289 return filemap_write_and_wait(src_inode->i_mapping);
1290 }
1291
1292 /*
1293 * Flush out either the folio that overlaps the beginning of a range in which
1294 * pos resides or the folio that overlaps the end of a range unless that folio
1295 * is entirely within the range we're going to invalidate. We extend the flush
1296 * bounds to encompass the folio.
1297 */
cifs_flush_folio(struct inode * inode,loff_t pos,loff_t * _fstart,loff_t * _fend,bool first)1298 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1299 bool first)
1300 {
1301 struct folio *folio;
1302 unsigned long long fpos, fend;
1303 pgoff_t index = pos / PAGE_SIZE;
1304 size_t size;
1305 int rc = 0;
1306
1307 folio = filemap_get_folio(inode->i_mapping, index);
1308 if (IS_ERR(folio))
1309 return 0;
1310
1311 size = folio_size(folio);
1312 fpos = folio_pos(folio);
1313 fend = fpos + size - 1;
1314 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1315 *_fend = max_t(unsigned long long, *_fend, fend);
1316 if ((first && pos == fpos) || (!first && pos == fend))
1317 goto out;
1318
1319 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1320 out:
1321 folio_put(folio);
1322 return rc;
1323 }
1324
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)1325 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1326 struct file *dst_file, loff_t destoff, loff_t len,
1327 unsigned int remap_flags)
1328 {
1329 struct inode *src_inode = file_inode(src_file);
1330 struct inode *target_inode = file_inode(dst_file);
1331 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1332 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1333 struct cifsFileInfo *smb_file_src = src_file->private_data;
1334 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1335 struct cifs_tcon *target_tcon, *src_tcon;
1336 unsigned long long destend, fstart, fend, old_size, new_size;
1337 unsigned int xid;
1338 int rc;
1339
1340 if (remap_flags & REMAP_FILE_DEDUP)
1341 return -EOPNOTSUPP;
1342 if (remap_flags & ~REMAP_FILE_ADVISORY)
1343 return -EINVAL;
1344
1345 cifs_dbg(FYI, "clone range\n");
1346
1347 xid = get_xid();
1348
1349 if (!smb_file_src || !smb_file_target) {
1350 rc = -EBADF;
1351 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1352 goto out;
1353 }
1354
1355 src_tcon = tlink_tcon(smb_file_src->tlink);
1356 target_tcon = tlink_tcon(smb_file_target->tlink);
1357
1358 /*
1359 * Note: cifs case is easier than btrfs since server responsible for
1360 * checks for proper open modes and file type and if it wants
1361 * server could even support copy of range where source = target
1362 */
1363 lock_two_nondirectories(target_inode, src_inode);
1364
1365 if (len == 0)
1366 len = src_inode->i_size - off;
1367
1368 cifs_dbg(FYI, "clone range\n");
1369
1370 /* Flush the source buffer */
1371 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1372 off + len - 1);
1373 if (rc)
1374 goto unlock;
1375
1376 /* The server-side copy will fail if the source crosses the EOF marker.
1377 * Advance the EOF marker after the flush above to the end of the range
1378 * if it's short of that.
1379 */
1380 if (src_cifsi->netfs.remote_i_size < off + len) {
1381 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1382 if (rc < 0)
1383 goto unlock;
1384 }
1385
1386 new_size = destoff + len;
1387 destend = destoff + len - 1;
1388
1389 /* Flush the folios at either end of the destination range to prevent
1390 * accidental loss of dirty data outside of the range.
1391 */
1392 fstart = destoff;
1393 fend = destend;
1394
1395 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1396 if (rc)
1397 goto unlock;
1398 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1399 if (rc)
1400 goto unlock;
1401 if (fend > target_cifsi->netfs.zero_point)
1402 target_cifsi->netfs.zero_point = fend + 1;
1403 old_size = target_cifsi->netfs.remote_i_size;
1404
1405 /* Discard all the folios that overlap the destination region. */
1406 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1407 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1408
1409 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1410 i_size_read(target_inode), 0);
1411
1412 rc = -EOPNOTSUPP;
1413 if (target_tcon->ses->server->ops->duplicate_extents) {
1414 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1415 smb_file_src, smb_file_target, off, len, destoff);
1416 if (rc == 0 && new_size > old_size) {
1417 truncate_setsize(target_inode, new_size);
1418 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1419 new_size);
1420 } else if (rc == -EOPNOTSUPP) {
1421 /*
1422 * copy_file_range syscall man page indicates EINVAL
1423 * is returned e.g when "fd_in and fd_out refer to the
1424 * same file and the source and target ranges overlap."
1425 * Test generic/157 was what showed these cases where
1426 * we need to remap EOPNOTSUPP to EINVAL
1427 */
1428 if (off >= src_inode->i_size) {
1429 rc = -EINVAL;
1430 } else if (src_inode == target_inode) {
1431 if (off + len > destoff)
1432 rc = -EINVAL;
1433 }
1434 }
1435 if (rc == 0 && new_size > target_cifsi->netfs.zero_point)
1436 target_cifsi->netfs.zero_point = new_size;
1437 }
1438
1439 /* force revalidate of size and timestamps of target file now
1440 that target is updated on the server */
1441 CIFS_I(target_inode)->time = 0;
1442 unlock:
1443 /* although unlocking in the reverse order from locking is not
1444 strictly necessary here it is a little cleaner to be consistent */
1445 unlock_two_nondirectories(src_inode, target_inode);
1446 out:
1447 free_xid(xid);
1448 return rc < 0 ? rc : len;
1449 }
1450
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)1451 ssize_t cifs_file_copychunk_range(unsigned int xid,
1452 struct file *src_file, loff_t off,
1453 struct file *dst_file, loff_t destoff,
1454 size_t len, unsigned int flags)
1455 {
1456 struct inode *src_inode = file_inode(src_file);
1457 struct inode *target_inode = file_inode(dst_file);
1458 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1459 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1460 struct cifsFileInfo *smb_file_src;
1461 struct cifsFileInfo *smb_file_target;
1462 struct cifs_tcon *src_tcon;
1463 struct cifs_tcon *target_tcon;
1464 ssize_t rc;
1465
1466 cifs_dbg(FYI, "copychunk range\n");
1467
1468 if (!src_file->private_data || !dst_file->private_data) {
1469 rc = -EBADF;
1470 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1471 goto out;
1472 }
1473
1474 rc = -EXDEV;
1475 smb_file_target = dst_file->private_data;
1476 smb_file_src = src_file->private_data;
1477 src_tcon = tlink_tcon(smb_file_src->tlink);
1478 target_tcon = tlink_tcon(smb_file_target->tlink);
1479
1480 if (src_tcon->ses != target_tcon->ses) {
1481 cifs_dbg(FYI, "source and target of copy not on same server\n");
1482 goto out;
1483 }
1484
1485 rc = -EOPNOTSUPP;
1486 if (!target_tcon->ses->server->ops->copychunk_range)
1487 goto out;
1488
1489 /*
1490 * Note: cifs case is easier than btrfs since server responsible for
1491 * checks for proper open modes and file type and if it wants
1492 * server could even support copy of range where source = target
1493 */
1494 lock_two_nondirectories(target_inode, src_inode);
1495
1496 cifs_dbg(FYI, "about to flush pages\n");
1497
1498 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1499 off + len - 1);
1500 if (rc)
1501 goto unlock;
1502
1503 /* The server-side copy will fail if the source crosses the EOF marker.
1504 * Advance the EOF marker after the flush above to the end of the range
1505 * if it's short of that.
1506 */
1507 if (src_cifsi->netfs.remote_i_size < off + len) {
1508 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1509 if (rc < 0)
1510 goto unlock;
1511 }
1512
1513 /* Flush and invalidate all the folios in the destination region. If
1514 * the copy was successful, then some of the flush is extra overhead,
1515 * but we need to allow for the copy failing in some way (eg. ENOSPC).
1516 */
1517 rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
1518 if (rc)
1519 goto unlock;
1520
1521 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1522 i_size_read(target_inode), 0);
1523
1524 rc = file_modified(dst_file);
1525 if (!rc) {
1526 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1527 smb_file_src, smb_file_target, off, len, destoff);
1528 if (rc > 0 && destoff + rc > i_size_read(target_inode)) {
1529 truncate_setsize(target_inode, destoff + rc);
1530 netfs_resize_file(&target_cifsi->netfs,
1531 i_size_read(target_inode), true);
1532 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1533 i_size_read(target_inode));
1534 }
1535 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point)
1536 target_cifsi->netfs.zero_point = destoff + rc;
1537 }
1538
1539 file_accessed(src_file);
1540
1541 /* force revalidate of size and timestamps of target file now
1542 * that target is updated on the server
1543 */
1544 CIFS_I(target_inode)->time = 0;
1545
1546 unlock:
1547 /* although unlocking in the reverse order from locking is not
1548 * strictly necessary here it is a little cleaner to be consistent
1549 */
1550 unlock_two_nondirectories(src_inode, target_inode);
1551
1552 out:
1553 return rc;
1554 }
1555
1556 /*
1557 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1558 * is a dummy operation.
1559 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1560 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1561 {
1562 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1563 file, datasync);
1564
1565 return 0;
1566 }
1567
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1568 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1569 struct file *dst_file, loff_t destoff,
1570 size_t len, unsigned int flags)
1571 {
1572 unsigned int xid = get_xid();
1573 ssize_t rc;
1574 struct cifsFileInfo *cfile = dst_file->private_data;
1575
1576 if (cfile->swapfile) {
1577 rc = -EOPNOTSUPP;
1578 free_xid(xid);
1579 return rc;
1580 }
1581
1582 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1583 len, flags);
1584 free_xid(xid);
1585
1586 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1587 rc = splice_copy_file_range(src_file, off, dst_file,
1588 destoff, len);
1589 return rc;
1590 }
1591
1592 const struct file_operations cifs_file_ops = {
1593 .read_iter = cifs_loose_read_iter,
1594 .write_iter = cifs_file_write_iter,
1595 .open = cifs_open,
1596 .release = cifs_close,
1597 .lock = cifs_lock,
1598 .flock = cifs_flock,
1599 .fsync = cifs_fsync,
1600 .flush = cifs_flush,
1601 .mmap_prepare = cifs_file_mmap_prepare,
1602 .splice_read = filemap_splice_read,
1603 .splice_write = iter_file_splice_write,
1604 .llseek = cifs_llseek,
1605 .unlocked_ioctl = cifs_ioctl,
1606 .copy_file_range = cifs_copy_file_range,
1607 .remap_file_range = cifs_remap_file_range,
1608 .setlease = cifs_setlease,
1609 .fallocate = cifs_fallocate,
1610 };
1611
1612 const struct file_operations cifs_file_strict_ops = {
1613 .read_iter = cifs_strict_readv,
1614 .write_iter = cifs_strict_writev,
1615 .open = cifs_open,
1616 .release = cifs_close,
1617 .lock = cifs_lock,
1618 .flock = cifs_flock,
1619 .fsync = cifs_strict_fsync,
1620 .flush = cifs_flush,
1621 .mmap_prepare = cifs_file_strict_mmap_prepare,
1622 .splice_read = filemap_splice_read,
1623 .splice_write = iter_file_splice_write,
1624 .llseek = cifs_llseek,
1625 .unlocked_ioctl = cifs_ioctl,
1626 .copy_file_range = cifs_copy_file_range,
1627 .remap_file_range = cifs_remap_file_range,
1628 .setlease = cifs_setlease,
1629 .fallocate = cifs_fallocate,
1630 };
1631
1632 const struct file_operations cifs_file_direct_ops = {
1633 .read_iter = netfs_unbuffered_read_iter,
1634 .write_iter = netfs_file_write_iter,
1635 .open = cifs_open,
1636 .release = cifs_close,
1637 .lock = cifs_lock,
1638 .flock = cifs_flock,
1639 .fsync = cifs_fsync,
1640 .flush = cifs_flush,
1641 .mmap_prepare = cifs_file_mmap_prepare,
1642 .splice_read = copy_splice_read,
1643 .splice_write = iter_file_splice_write,
1644 .unlocked_ioctl = cifs_ioctl,
1645 .copy_file_range = cifs_copy_file_range,
1646 .remap_file_range = cifs_remap_file_range,
1647 .llseek = cifs_llseek,
1648 .setlease = cifs_setlease,
1649 .fallocate = cifs_fallocate,
1650 };
1651
1652 const struct file_operations cifs_file_nobrl_ops = {
1653 .read_iter = cifs_loose_read_iter,
1654 .write_iter = cifs_file_write_iter,
1655 .open = cifs_open,
1656 .release = cifs_close,
1657 .fsync = cifs_fsync,
1658 .flush = cifs_flush,
1659 .mmap_prepare = cifs_file_mmap_prepare,
1660 .splice_read = filemap_splice_read,
1661 .splice_write = iter_file_splice_write,
1662 .llseek = cifs_llseek,
1663 .unlocked_ioctl = cifs_ioctl,
1664 .copy_file_range = cifs_copy_file_range,
1665 .remap_file_range = cifs_remap_file_range,
1666 .setlease = cifs_setlease,
1667 .fallocate = cifs_fallocate,
1668 };
1669
1670 const struct file_operations cifs_file_strict_nobrl_ops = {
1671 .read_iter = cifs_strict_readv,
1672 .write_iter = cifs_strict_writev,
1673 .open = cifs_open,
1674 .release = cifs_close,
1675 .fsync = cifs_strict_fsync,
1676 .flush = cifs_flush,
1677 .mmap_prepare = cifs_file_strict_mmap_prepare,
1678 .splice_read = filemap_splice_read,
1679 .splice_write = iter_file_splice_write,
1680 .llseek = cifs_llseek,
1681 .unlocked_ioctl = cifs_ioctl,
1682 .copy_file_range = cifs_copy_file_range,
1683 .remap_file_range = cifs_remap_file_range,
1684 .setlease = cifs_setlease,
1685 .fallocate = cifs_fallocate,
1686 };
1687
1688 const struct file_operations cifs_file_direct_nobrl_ops = {
1689 .read_iter = netfs_unbuffered_read_iter,
1690 .write_iter = netfs_file_write_iter,
1691 .open = cifs_open,
1692 .release = cifs_close,
1693 .fsync = cifs_fsync,
1694 .flush = cifs_flush,
1695 .mmap_prepare = cifs_file_mmap_prepare,
1696 .splice_read = copy_splice_read,
1697 .splice_write = iter_file_splice_write,
1698 .unlocked_ioctl = cifs_ioctl,
1699 .copy_file_range = cifs_copy_file_range,
1700 .remap_file_range = cifs_remap_file_range,
1701 .llseek = cifs_llseek,
1702 .setlease = cifs_setlease,
1703 .fallocate = cifs_fallocate,
1704 };
1705
1706 const struct file_operations cifs_dir_ops = {
1707 .iterate_shared = cifs_readdir,
1708 .release = cifs_closedir,
1709 .read = generic_read_dir,
1710 .unlocked_ioctl = cifs_ioctl,
1711 .copy_file_range = cifs_copy_file_range,
1712 .remap_file_range = cifs_remap_file_range,
1713 .llseek = generic_file_llseek,
1714 .fsync = cifs_dir_fsync,
1715 };
1716
1717 static void
cifs_init_once(void * inode)1718 cifs_init_once(void *inode)
1719 {
1720 struct cifsInodeInfo *cifsi = inode;
1721
1722 inode_init_once(&cifsi->netfs.inode);
1723 init_rwsem(&cifsi->lock_sem);
1724 }
1725
1726 static int __init
cifs_init_inodecache(void)1727 cifs_init_inodecache(void)
1728 {
1729 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1730 sizeof(struct cifsInodeInfo),
1731 0, (SLAB_RECLAIM_ACCOUNT|
1732 SLAB_ACCOUNT),
1733 cifs_init_once);
1734 if (cifs_inode_cachep == NULL)
1735 return -ENOMEM;
1736
1737 return 0;
1738 }
1739
1740 static void
cifs_destroy_inodecache(void)1741 cifs_destroy_inodecache(void)
1742 {
1743 /*
1744 * Make sure all delayed rcu free inodes are flushed before we
1745 * destroy cache.
1746 */
1747 rcu_barrier();
1748 kmem_cache_destroy(cifs_inode_cachep);
1749 }
1750
1751 static int
cifs_init_request_bufs(void)1752 cifs_init_request_bufs(void)
1753 {
1754 /*
1755 * SMB2 maximum header size is bigger than CIFS one - no problems to
1756 * allocate some more bytes for CIFS.
1757 */
1758 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1759
1760 if (CIFSMaxBufSize < 8192) {
1761 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1762 Unicode path name has to fit in any SMB/CIFS path based frames */
1763 CIFSMaxBufSize = 8192;
1764 } else if (CIFSMaxBufSize > 1024*127) {
1765 CIFSMaxBufSize = 1024 * 127;
1766 } else {
1767 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1768 }
1769 /*
1770 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1771 CIFSMaxBufSize, CIFSMaxBufSize);
1772 */
1773 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1774 CIFSMaxBufSize + max_hdr_size, 0,
1775 SLAB_HWCACHE_ALIGN, 0,
1776 CIFSMaxBufSize + max_hdr_size,
1777 NULL);
1778 if (cifs_req_cachep == NULL)
1779 return -ENOMEM;
1780
1781 if (cifs_min_rcv < 1)
1782 cifs_min_rcv = 1;
1783 else if (cifs_min_rcv > 64) {
1784 cifs_min_rcv = 64;
1785 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1786 }
1787
1788 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1789 cifs_req_cachep);
1790
1791 if (cifs_req_poolp == NULL) {
1792 kmem_cache_destroy(cifs_req_cachep);
1793 return -ENOMEM;
1794 }
1795 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1796 almost all handle based requests (but not write response, nor is it
1797 sufficient for path based requests). A smaller size would have
1798 been more efficient (compacting multiple slab items on one 4k page)
1799 for the case in which debug was on, but this larger size allows
1800 more SMBs to use small buffer alloc and is still much more
1801 efficient to alloc 1 per page off the slab compared to 17K (5page)
1802 alloc of large cifs buffers even when page debugging is on */
1803 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1804 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1805 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1806 if (cifs_sm_req_cachep == NULL) {
1807 mempool_destroy(cifs_req_poolp);
1808 kmem_cache_destroy(cifs_req_cachep);
1809 return -ENOMEM;
1810 }
1811
1812 if (cifs_min_small < 2)
1813 cifs_min_small = 2;
1814 else if (cifs_min_small > 256) {
1815 cifs_min_small = 256;
1816 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1817 }
1818
1819 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1820 cifs_sm_req_cachep);
1821
1822 if (cifs_sm_req_poolp == NULL) {
1823 mempool_destroy(cifs_req_poolp);
1824 kmem_cache_destroy(cifs_req_cachep);
1825 kmem_cache_destroy(cifs_sm_req_cachep);
1826 return -ENOMEM;
1827 }
1828
1829 return 0;
1830 }
1831
1832 static void
cifs_destroy_request_bufs(void)1833 cifs_destroy_request_bufs(void)
1834 {
1835 mempool_destroy(cifs_req_poolp);
1836 kmem_cache_destroy(cifs_req_cachep);
1837 mempool_destroy(cifs_sm_req_poolp);
1838 kmem_cache_destroy(cifs_sm_req_cachep);
1839 }
1840
init_mids(void)1841 static int init_mids(void)
1842 {
1843 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1844 sizeof(struct mid_q_entry), 0,
1845 SLAB_HWCACHE_ALIGN, NULL);
1846 if (cifs_mid_cachep == NULL)
1847 return -ENOMEM;
1848
1849 /* 3 is a reasonable minimum number of simultaneous operations */
1850 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1851 if (cifs_mid_poolp == NULL) {
1852 kmem_cache_destroy(cifs_mid_cachep);
1853 return -ENOMEM;
1854 }
1855
1856 return 0;
1857 }
1858
destroy_mids(void)1859 static void destroy_mids(void)
1860 {
1861 mempool_destroy(cifs_mid_poolp);
1862 kmem_cache_destroy(cifs_mid_cachep);
1863 }
1864
cifs_init_netfs(void)1865 static int cifs_init_netfs(void)
1866 {
1867 cifs_io_request_cachep =
1868 kmem_cache_create("cifs_io_request",
1869 sizeof(struct cifs_io_request), 0,
1870 SLAB_HWCACHE_ALIGN, NULL);
1871 if (!cifs_io_request_cachep)
1872 goto nomem_req;
1873
1874 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
1875 goto nomem_reqpool;
1876
1877 cifs_io_subrequest_cachep =
1878 kmem_cache_create("cifs_io_subrequest",
1879 sizeof(struct cifs_io_subrequest), 0,
1880 SLAB_HWCACHE_ALIGN, NULL);
1881 if (!cifs_io_subrequest_cachep)
1882 goto nomem_subreq;
1883
1884 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
1885 goto nomem_subreqpool;
1886
1887 return 0;
1888
1889 nomem_subreqpool:
1890 kmem_cache_destroy(cifs_io_subrequest_cachep);
1891 nomem_subreq:
1892 mempool_exit(&cifs_io_request_pool);
1893 nomem_reqpool:
1894 kmem_cache_destroy(cifs_io_request_cachep);
1895 nomem_req:
1896 return -ENOMEM;
1897 }
1898
cifs_destroy_netfs(void)1899 static void cifs_destroy_netfs(void)
1900 {
1901 mempool_exit(&cifs_io_subrequest_pool);
1902 kmem_cache_destroy(cifs_io_subrequest_cachep);
1903 mempool_exit(&cifs_io_request_pool);
1904 kmem_cache_destroy(cifs_io_request_cachep);
1905 }
1906
1907 static int __init
init_cifs(void)1908 init_cifs(void)
1909 {
1910 int rc = 0;
1911 cifs_proc_init();
1912 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1913 /*
1914 * Initialize Global counters
1915 */
1916 atomic_set(&sesInfoAllocCount, 0);
1917 atomic_set(&tconInfoAllocCount, 0);
1918 atomic_set(&tcpSesNextId, 0);
1919 atomic_set(&tcpSesAllocCount, 0);
1920 atomic_set(&tcpSesReconnectCount, 0);
1921 atomic_set(&tconInfoReconnectCount, 0);
1922
1923 atomic_set(&buf_alloc_count, 0);
1924 atomic_set(&small_buf_alloc_count, 0);
1925 #ifdef CONFIG_CIFS_STATS2
1926 atomic_set(&total_buf_alloc_count, 0);
1927 atomic_set(&total_small_buf_alloc_count, 0);
1928 if (slow_rsp_threshold < 1)
1929 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1930 else if (slow_rsp_threshold > 32767)
1931 cifs_dbg(VFS,
1932 "slow response threshold set higher than recommended (0 to 32767)\n");
1933 #endif /* CONFIG_CIFS_STATS2 */
1934
1935 atomic_set(&mid_count, 0);
1936 GlobalCurrentXid = 0;
1937 GlobalTotalActiveXid = 0;
1938 GlobalMaxActiveXid = 0;
1939
1940 cifs_lock_secret = get_random_u32();
1941
1942 if (cifs_max_pending < 2) {
1943 cifs_max_pending = 2;
1944 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1945 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1946 cifs_max_pending = CIFS_MAX_REQ;
1947 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1948 CIFS_MAX_REQ);
1949 }
1950
1951 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1952 if (dir_cache_timeout > 65000) {
1953 dir_cache_timeout = 65000;
1954 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1955 }
1956
1957 cifsiod_wq = alloc_workqueue("cifsiod",
1958 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1959 0);
1960 if (!cifsiod_wq) {
1961 rc = -ENOMEM;
1962 goto out_clean_proc;
1963 }
1964
1965 /*
1966 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1967 * so that we don't launch too many worker threads but
1968 * Documentation/core-api/workqueue.rst recommends setting it to 0
1969 */
1970
1971 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1972 decrypt_wq = alloc_workqueue("smb3decryptd",
1973 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1974 if (!decrypt_wq) {
1975 rc = -ENOMEM;
1976 goto out_destroy_cifsiod_wq;
1977 }
1978
1979 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1980 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1981 if (!fileinfo_put_wq) {
1982 rc = -ENOMEM;
1983 goto out_destroy_decrypt_wq;
1984 }
1985
1986 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1987 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1988 0);
1989 if (!cifsoplockd_wq) {
1990 rc = -ENOMEM;
1991 goto out_destroy_fileinfo_put_wq;
1992 }
1993
1994 deferredclose_wq = alloc_workqueue("deferredclose",
1995 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1996 0);
1997 if (!deferredclose_wq) {
1998 rc = -ENOMEM;
1999 goto out_destroy_cifsoplockd_wq;
2000 }
2001
2002 serverclose_wq = alloc_workqueue("serverclose",
2003 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2004 0);
2005 if (!serverclose_wq) {
2006 rc = -ENOMEM;
2007 goto out_destroy_deferredclose_wq;
2008 }
2009
2010 cfid_put_wq = alloc_workqueue("cfid_put_wq",
2011 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2012 0);
2013 if (!cfid_put_wq) {
2014 rc = -ENOMEM;
2015 goto out_destroy_serverclose_wq;
2016 }
2017
2018 rc = cifs_init_inodecache();
2019 if (rc)
2020 goto out_destroy_cfid_put_wq;
2021
2022 rc = cifs_init_netfs();
2023 if (rc)
2024 goto out_destroy_inodecache;
2025
2026 rc = init_mids();
2027 if (rc)
2028 goto out_destroy_netfs;
2029
2030 rc = cifs_init_request_bufs();
2031 if (rc)
2032 goto out_destroy_mids;
2033
2034 #ifdef CONFIG_CIFS_DFS_UPCALL
2035 rc = dfs_cache_init();
2036 if (rc)
2037 goto out_destroy_request_bufs;
2038 #endif /* CONFIG_CIFS_DFS_UPCALL */
2039 #ifdef CONFIG_CIFS_UPCALL
2040 rc = init_cifs_spnego();
2041 if (rc)
2042 goto out_destroy_dfs_cache;
2043 #endif /* CONFIG_CIFS_UPCALL */
2044 #ifdef CONFIG_CIFS_SWN_UPCALL
2045 rc = cifs_genl_init();
2046 if (rc)
2047 goto out_register_key_type;
2048 #endif /* CONFIG_CIFS_SWN_UPCALL */
2049
2050 rc = init_cifs_idmap();
2051 if (rc)
2052 goto out_cifs_swn_init;
2053
2054 rc = register_filesystem(&cifs_fs_type);
2055 if (rc)
2056 goto out_init_cifs_idmap;
2057
2058 rc = register_filesystem(&smb3_fs_type);
2059 if (rc) {
2060 unregister_filesystem(&cifs_fs_type);
2061 goto out_init_cifs_idmap;
2062 }
2063
2064 return 0;
2065
2066 out_init_cifs_idmap:
2067 exit_cifs_idmap();
2068 out_cifs_swn_init:
2069 #ifdef CONFIG_CIFS_SWN_UPCALL
2070 cifs_genl_exit();
2071 out_register_key_type:
2072 #endif
2073 #ifdef CONFIG_CIFS_UPCALL
2074 exit_cifs_spnego();
2075 out_destroy_dfs_cache:
2076 #endif
2077 #ifdef CONFIG_CIFS_DFS_UPCALL
2078 dfs_cache_destroy();
2079 out_destroy_request_bufs:
2080 #endif
2081 cifs_destroy_request_bufs();
2082 out_destroy_mids:
2083 destroy_mids();
2084 out_destroy_netfs:
2085 cifs_destroy_netfs();
2086 out_destroy_inodecache:
2087 cifs_destroy_inodecache();
2088 out_destroy_cfid_put_wq:
2089 destroy_workqueue(cfid_put_wq);
2090 out_destroy_serverclose_wq:
2091 destroy_workqueue(serverclose_wq);
2092 out_destroy_deferredclose_wq:
2093 destroy_workqueue(deferredclose_wq);
2094 out_destroy_cifsoplockd_wq:
2095 destroy_workqueue(cifsoplockd_wq);
2096 out_destroy_fileinfo_put_wq:
2097 destroy_workqueue(fileinfo_put_wq);
2098 out_destroy_decrypt_wq:
2099 destroy_workqueue(decrypt_wq);
2100 out_destroy_cifsiod_wq:
2101 destroy_workqueue(cifsiod_wq);
2102 out_clean_proc:
2103 cifs_proc_clean();
2104 return rc;
2105 }
2106
2107 static void __exit
exit_cifs(void)2108 exit_cifs(void)
2109 {
2110 cifs_dbg(NOISY, "exit_smb3\n");
2111 unregister_filesystem(&cifs_fs_type);
2112 unregister_filesystem(&smb3_fs_type);
2113 cifs_release_automount_timer();
2114 exit_cifs_idmap();
2115 #ifdef CONFIG_CIFS_SWN_UPCALL
2116 cifs_genl_exit();
2117 #endif
2118 #ifdef CONFIG_CIFS_UPCALL
2119 exit_cifs_spnego();
2120 #endif
2121 #ifdef CONFIG_CIFS_DFS_UPCALL
2122 dfs_cache_destroy();
2123 #endif
2124 cifs_destroy_request_bufs();
2125 destroy_mids();
2126 cifs_destroy_netfs();
2127 cifs_destroy_inodecache();
2128 destroy_workqueue(deferredclose_wq);
2129 destroy_workqueue(cifsoplockd_wq);
2130 destroy_workqueue(decrypt_wq);
2131 destroy_workqueue(fileinfo_put_wq);
2132 destroy_workqueue(serverclose_wq);
2133 destroy_workqueue(cfid_put_wq);
2134 destroy_workqueue(cifsiod_wq);
2135 cifs_proc_clean();
2136 }
2137
2138 MODULE_AUTHOR("Steve French");
2139 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2140 MODULE_DESCRIPTION
2141 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2142 "also older servers complying with the SNIA CIFS Specification)");
2143 MODULE_VERSION(CIFS_VERSION);
2144 MODULE_SOFTDEP("ecb");
2145 MODULE_SOFTDEP("nls");
2146 MODULE_SOFTDEP("aes");
2147 MODULE_SOFTDEP("cmac");
2148 MODULE_SOFTDEP("aead2");
2149 MODULE_SOFTDEP("ccm");
2150 MODULE_SOFTDEP("gcm");
2151 module_init(init_cifs)
2152 module_exit(exit_cifs)
2153