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 <linux/mm.h>
32 #include <linux/key-type.h>
33 #include <uapi/linux/magic.h>
34 #include <net/ipv6.h>
35 #include "cifsfs.h"
36 #include "cifspdu.h"
37 #define DECLARE_GLOBALS_HERE
38 #include "cifsglob.h"
39 #include "cifsproto.h"
40 #include "smb2proto.h"
41 #include "cifs_debug.h"
42 #include "cifs_fs_sb.h"
43 #include "cifs_spnego.h"
44 #include "fscache.h"
45 #ifdef CONFIG_CIFS_DFS_UPCALL
46 #include "dfs_cache.h"
47 #endif
48 #ifdef CONFIG_CIFS_SWN_UPCALL
49 #include "netlink.h"
50 #endif
51 #include "fs_context.h"
52 #include "cached_dir.h"
53
54 /*
55 * DOS dates from 1980/1/1 through 2107/12/31
56 * Protocol specifications indicate the range should be to 119, which
57 * limits maximum year to 2099. But this range has not been checked.
58 */
59 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
60 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
61 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
62
63 int cifsFYI = 0;
64 bool traceSMB;
65 bool enable_oplocks = true;
66 bool linuxExtEnabled = true;
67 bool lookupCacheEnabled = true;
68 bool disable_legacy_dialects; /* false by default */
69 bool enable_gcm_256 = true;
70 bool require_gcm_256; /* false by default */
71 bool enable_negotiate_signing; /* false by default */
72 unsigned int global_secflags = CIFSSEC_DEF;
73 /* unsigned int ntlmv2_support = 0; */
74
75 /*
76 * Global transaction id (XID) information
77 */
78 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */
79 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */
80 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */
81 DEFINE_SPINLOCK(GlobalMid_Lock); /* protects above & list operations on midQ entries */
82
83 /*
84 * Global counters, updated atomically
85 */
86 atomic_t sesInfoAllocCount;
87 atomic_t tconInfoAllocCount;
88 atomic_t tcpSesNextId;
89 atomic_t tcpSesAllocCount;
90 atomic_t tcpSesReconnectCount;
91 atomic_t tconInfoReconnectCount;
92
93 atomic_t mid_count;
94 atomic_t buf_alloc_count;
95 atomic_t small_buf_alloc_count;
96 #ifdef CONFIG_CIFS_STATS2
97 atomic_t total_buf_alloc_count;
98 atomic_t total_small_buf_alloc_count;
99 #endif/* STATS2 */
100 struct list_head cifs_tcp_ses_list;
101 DEFINE_SPINLOCK(cifs_tcp_ses_lock);
102 static const struct super_operations cifs_super_ops;
103 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
104 module_param(CIFSMaxBufSize, uint, 0444);
105 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
106 "for CIFS requests. "
107 "Default: 16384 Range: 8192 to 130048");
108 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
109 module_param(cifs_min_rcv, uint, 0444);
110 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
111 "1 to 64");
112 unsigned int cifs_min_small = 30;
113 module_param(cifs_min_small, uint, 0444);
114 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
115 "Range: 2 to 256");
116 unsigned int cifs_max_pending = CIFS_MAX_REQ;
117 module_param(cifs_max_pending, uint, 0444);
118 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
119 "CIFS/SMB1 dialect (N/A for SMB3) "
120 "Default: 32767 Range: 2 to 32767.");
121 unsigned int dir_cache_timeout = 30;
122 module_param(dir_cache_timeout, uint, 0644);
123 MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 "
124 "Range: 1 to 65000 seconds, 0 to disable caching dir contents");
125 /* Module-wide total cached dirents (in bytes) across all tcons */
126 atomic64_t cifs_dircache_bytes_used = ATOMIC64_INIT(0);
127
128 /*
129 * Write-only module parameter to drop all cached directory entries across
130 * all CIFS mounts. Echo a non-zero value to trigger.
131 */
cifs_drop_all_dir_caches(void)132 static void cifs_drop_all_dir_caches(void)
133 {
134 struct TCP_Server_Info *server;
135 struct cifs_ses *ses;
136 struct cifs_tcon *tcon;
137
138 spin_lock(&cifs_tcp_ses_lock);
139 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
140 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
141 if (cifs_ses_exiting(ses))
142 continue;
143 list_for_each_entry(tcon, &ses->tcon_list, tcon_list)
144 invalidate_all_cached_dirs(tcon);
145 }
146 }
147 spin_unlock(&cifs_tcp_ses_lock);
148 }
149
cifs_param_set_drop_dir_cache(const char * val,const struct kernel_param * kp)150 static int cifs_param_set_drop_dir_cache(const char *val, const struct kernel_param *kp)
151 {
152 bool bv;
153 int rc = kstrtobool(val, &bv);
154
155 if (rc)
156 return rc;
157 if (bv)
158 cifs_drop_all_dir_caches();
159 return 0;
160 }
161
162 module_param_call(drop_dir_cache, cifs_param_set_drop_dir_cache, NULL, NULL, 0200);
163 MODULE_PARM_DESC(drop_dir_cache, "Write 1 to drop all cached directory entries across all CIFS mounts");
164
165 #ifdef CONFIG_CIFS_STATS2
166 unsigned int slow_rsp_threshold = 1;
167 module_param(slow_rsp_threshold, uint, 0644);
168 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
169 "before logging that a response is delayed. "
170 "Default: 1 (if set to 0 disables msg).");
171 #endif /* STATS2 */
172
173 module_param(enable_oplocks, bool, 0644);
174 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
175
176 module_param(enable_gcm_256, bool, 0644);
177 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: y/Y/1");
178
179 module_param(require_gcm_256, bool, 0644);
180 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
181
182 module_param(enable_negotiate_signing, bool, 0644);
183 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
184
185 module_param(disable_legacy_dialects, bool, 0644);
186 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
187 "helpful to restrict the ability to "
188 "override the default dialects (SMB2.1, "
189 "SMB3 and SMB3.02) on mount with old "
190 "dialects (CIFS/SMB1 and SMB2) since "
191 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
192 " and less secure. Default: n/N/0");
193
194 struct workqueue_struct *cifsiod_wq;
195 struct workqueue_struct *decrypt_wq;
196 struct workqueue_struct *fileinfo_put_wq;
197 struct workqueue_struct *cifsoplockd_wq;
198 struct workqueue_struct *deferredclose_wq;
199 struct workqueue_struct *serverclose_wq;
200 struct workqueue_struct *cfid_put_wq;
201 __u32 cifs_lock_secret;
202
203 /*
204 * Bumps refcount for cifs super block.
205 * Note that it should be only called if a reference to VFS super block is
206 * already held, e.g. in open-type syscalls context. Otherwise it can race with
207 * atomic_dec_and_test in deactivate_locked_super.
208 */
209 void
cifs_sb_active(struct super_block * sb)210 cifs_sb_active(struct super_block *sb)
211 {
212 struct cifs_sb_info *server = CIFS_SB(sb);
213
214 if (atomic_inc_return(&server->active) == 1)
215 atomic_inc(&sb->s_active);
216 }
217
218 void
cifs_sb_deactive(struct super_block * sb)219 cifs_sb_deactive(struct super_block *sb)
220 {
221 struct cifs_sb_info *server = CIFS_SB(sb);
222
223 if (atomic_dec_and_test(&server->active))
224 deactivate_super(sb);
225 }
226
227 static int
cifs_read_super(struct super_block * sb)228 cifs_read_super(struct super_block *sb)
229 {
230 struct inode *inode;
231 struct cifs_sb_info *cifs_sb;
232 struct cifs_tcon *tcon;
233 struct timespec64 ts;
234 int rc = 0;
235
236 cifs_sb = CIFS_SB(sb);
237 tcon = cifs_sb_master_tcon(cifs_sb);
238
239 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
240 sb->s_flags |= SB_POSIXACL;
241
242 if (tcon->snapshot_time)
243 sb->s_flags |= SB_RDONLY;
244
245 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
246 sb->s_maxbytes = MAX_LFS_FILESIZE;
247 else
248 sb->s_maxbytes = MAX_NON_LFS;
249
250 /*
251 * Some very old servers like DOS and OS/2 used 2 second granularity
252 * (while all current servers use 100ns granularity - see MS-DTYP)
253 * but 1 second is the maximum allowed granularity for the VFS
254 * so for old servers set time granularity to 1 second while for
255 * everything else (current servers) set it to 100ns.
256 */
257 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
258 ((tcon->ses->capabilities &
259 tcon->ses->server->vals->cap_nt_find) == 0) &&
260 !tcon->unix_ext) {
261 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
262 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
263 sb->s_time_min = ts.tv_sec;
264 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
265 cpu_to_le16(SMB_TIME_MAX), 0);
266 sb->s_time_max = ts.tv_sec;
267 } else {
268 /*
269 * Almost every server, including all SMB2+, uses DCE TIME
270 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
271 */
272 sb->s_time_gran = 100;
273 ts = cifs_NTtimeToUnix(0);
274 sb->s_time_min = ts.tv_sec;
275 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
276 sb->s_time_max = ts.tv_sec;
277 }
278
279 sb->s_magic = CIFS_SUPER_MAGIC;
280 sb->s_op = &cifs_super_ops;
281 sb->s_xattr = cifs_xattr_handlers;
282 rc = super_setup_bdi(sb);
283 if (rc)
284 goto out_no_root;
285 /* tune readahead according to rsize if readahead size not set on mount */
286 if (cifs_sb->ctx->rsize == 0)
287 cifs_sb->ctx->rsize =
288 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
289 if (cifs_sb->ctx->rasize)
290 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
291 else
292 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
293
294 sb->s_blocksize = CIFS_MAX_MSGSIZE;
295 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
296 inode = cifs_root_iget(sb);
297
298 if (IS_ERR(inode)) {
299 rc = PTR_ERR(inode);
300 goto out_no_root;
301 }
302
303 if (tcon->nocase)
304 set_default_d_op(sb, &cifs_ci_dentry_ops);
305 else
306 set_default_d_op(sb, &cifs_dentry_ops);
307
308 sb->s_root = d_make_root(inode);
309 if (!sb->s_root) {
310 rc = -ENOMEM;
311 goto out_no_root;
312 }
313
314 #ifdef CONFIG_CIFS_NFSD_EXPORT
315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
316 cifs_dbg(FYI, "export ops supported\n");
317 sb->s_export_op = &cifs_export_ops;
318 }
319 #endif /* CONFIG_CIFS_NFSD_EXPORT */
320
321 return 0;
322
323 out_no_root:
324 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
325 return rc;
326 }
327
cifs_kill_sb(struct super_block * sb)328 static void cifs_kill_sb(struct super_block *sb)
329 {
330 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
331
332 /*
333 * We need to release all dentries for the cached directories
334 * before we kill the sb.
335 */
336 if (cifs_sb->root) {
337 close_all_cached_dirs(cifs_sb);
338
339 /* finally release root dentry */
340 dput(cifs_sb->root);
341 cifs_sb->root = NULL;
342 }
343
344 kill_anon_super(sb);
345 cifs_umount(cifs_sb);
346 }
347
348 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)349 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
350 {
351 struct super_block *sb = dentry->d_sb;
352 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
353 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
354 struct TCP_Server_Info *server = tcon->ses->server;
355 unsigned int xid;
356 int rc = 0;
357 const char *full_path;
358 void *page;
359
360 xid = get_xid();
361 page = alloc_dentry_path();
362
363 full_path = build_path_from_dentry(dentry, page);
364 if (IS_ERR(full_path)) {
365 rc = PTR_ERR(full_path);
366 goto statfs_out;
367 }
368
369 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
370 buf->f_namelen =
371 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
372 else
373 buf->f_namelen = PATH_MAX;
374
375 buf->f_fsid.val[0] = tcon->vol_serial_number;
376 /* are using part of create time for more randomness, see man statfs */
377 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
378
379 buf->f_files = 0; /* undefined */
380 buf->f_ffree = 0; /* unlimited */
381
382 if (server->ops->queryfs)
383 rc = server->ops->queryfs(xid, tcon, full_path, cifs_sb, buf);
384
385 statfs_out:
386 free_dentry_path(page);
387 free_xid(xid);
388 return rc;
389 }
390
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)391 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
392 {
393 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
394 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
395 struct TCP_Server_Info *server = tcon->ses->server;
396 struct inode *inode = file_inode(file);
397 int rc;
398
399 if (!server->ops->fallocate)
400 return -EOPNOTSUPP;
401
402 rc = inode_lock_killable(inode);
403 if (rc)
404 return rc;
405
406 netfs_wait_for_outstanding_io(inode);
407
408 rc = file_modified(file);
409 if (rc)
410 goto out_unlock;
411
412 rc = server->ops->fallocate(file, tcon, mode, off, len);
413
414 out_unlock:
415 inode_unlock(inode);
416 return rc;
417 }
418
cifs_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)419 static int cifs_permission(struct mnt_idmap *idmap,
420 struct inode *inode, int mask)
421 {
422 struct cifs_sb_info *cifs_sb;
423
424 cifs_sb = CIFS_SB(inode->i_sb);
425
426 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
427 if ((mask & MAY_EXEC) && !execute_ok(inode))
428 return -EACCES;
429 else
430 return 0;
431 } else /* file mode might have been restricted at mount time
432 on the client (above and beyond ACL on servers) for
433 servers which do not support setting and viewing mode bits,
434 so allowing client to check permissions is useful */
435 return generic_permission(&nop_mnt_idmap, inode, mask);
436 }
437
438 static struct kmem_cache *cifs_inode_cachep;
439 static struct kmem_cache *cifs_req_cachep;
440 static struct kmem_cache *cifs_mid_cachep;
441 static struct kmem_cache *cifs_sm_req_cachep;
442 static struct kmem_cache *cifs_io_request_cachep;
443 static struct kmem_cache *cifs_io_subrequest_cachep;
444 mempool_t *cifs_sm_req_poolp;
445 mempool_t *cifs_req_poolp;
446 mempool_t cifs_mid_pool;
447 mempool_t cifs_io_request_pool;
448 mempool_t cifs_io_subrequest_pool;
449
450 static struct inode *
cifs_alloc_inode(struct super_block * sb)451 cifs_alloc_inode(struct super_block *sb)
452 {
453 struct cifsInodeInfo *cifs_inode;
454 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
455 if (!cifs_inode)
456 return NULL;
457 cifs_inode->cifsAttrs = ATTR_ARCHIVE; /* default */
458 cifs_inode->time = 0;
459 /*
460 * Until the file is open and we have gotten oplock info back from the
461 * server, can not assume caching of file data or metadata.
462 */
463 cifs_set_oplock_level(cifs_inode, 0);
464 cifs_inode->lease_granted = false;
465 cifs_inode->flags = 0;
466 spin_lock_init(&cifs_inode->writers_lock);
467 cifs_inode->writers = 0;
468 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
469 cifs_inode->netfs.remote_i_size = 0;
470 cifs_inode->uniqueid = 0;
471 cifs_inode->createtime = 0;
472 cifs_inode->epoch = 0;
473 spin_lock_init(&cifs_inode->open_file_lock);
474 generate_random_uuid(cifs_inode->lease_key);
475 cifs_inode->symlink_target = NULL;
476
477 /*
478 * Can not set i_flags here - they get immediately overwritten to zero
479 * by the VFS.
480 */
481 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
482 INIT_LIST_HEAD(&cifs_inode->openFileList);
483 INIT_LIST_HEAD(&cifs_inode->llist);
484 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
485 spin_lock_init(&cifs_inode->deferred_lock);
486 return &cifs_inode->netfs.inode;
487 }
488
489 static void
cifs_free_inode(struct inode * inode)490 cifs_free_inode(struct inode *inode)
491 {
492 struct cifsInodeInfo *cinode = CIFS_I(inode);
493
494 if (S_ISLNK(inode->i_mode))
495 kfree(cinode->symlink_target);
496 kmem_cache_free(cifs_inode_cachep, cinode);
497 }
498
499 static void
cifs_evict_inode(struct inode * inode)500 cifs_evict_inode(struct inode *inode)
501 {
502 netfs_wait_for_outstanding_io(inode);
503 truncate_inode_pages_final(&inode->i_data);
504 if (inode_state_read_once(inode) & I_PINNING_NETFS_WB)
505 cifs_fscache_unuse_inode_cookie(inode, true);
506 cifs_fscache_release_inode_cookie(inode);
507 clear_inode(inode);
508 }
509
510 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)511 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
512 {
513 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
514 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
515
516 seq_puts(s, ",addr=");
517
518 switch (server->dstaddr.ss_family) {
519 case AF_INET:
520 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
521 break;
522 case AF_INET6:
523 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
524 if (sa6->sin6_scope_id)
525 seq_printf(s, "%%%u", sa6->sin6_scope_id);
526 break;
527 default:
528 seq_puts(s, "(unknown)");
529 }
530 if (server->rdma)
531 seq_puts(s, ",rdma");
532 }
533
534 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)535 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
536 {
537 if (ses->sectype == Unspecified) {
538 if (ses->user_name == NULL)
539 seq_puts(s, ",sec=none");
540 return;
541 }
542
543 seq_puts(s, ",sec=");
544
545 switch (ses->sectype) {
546 case NTLMv2:
547 seq_puts(s, "ntlmv2");
548 break;
549 case Kerberos:
550 seq_puts(s, "krb5");
551 break;
552 case RawNTLMSSP:
553 seq_puts(s, "ntlmssp");
554 break;
555 default:
556 /* shouldn't ever happen */
557 seq_puts(s, "unknown");
558 break;
559 }
560
561 if (ses->sign)
562 seq_puts(s, "i");
563
564 if (ses->sectype == Kerberos)
565 seq_printf(s, ",cruid=%u",
566 from_kuid_munged(&init_user_ns, ses->cred_uid));
567 }
568
569 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)570 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
571 {
572 seq_puts(s, ",cache=");
573
574 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
575 seq_puts(s, "strict");
576 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
577 seq_puts(s, "none");
578 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
579 seq_puts(s, "singleclient"); /* assume only one client access */
580 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
581 seq_puts(s, "ro"); /* read only caching assumed */
582 else
583 seq_puts(s, "loose");
584 }
585
586 /*
587 * cifs_show_devname() is used so we show the mount device name with correct
588 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
589 */
cifs_show_devname(struct seq_file * m,struct dentry * root)590 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
591 {
592 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
593 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
594
595 if (devname == NULL)
596 seq_puts(m, "none");
597 else {
598 convert_delimiter(devname, '/');
599 /* escape all spaces in share names */
600 seq_escape(m, devname, " \t");
601 kfree(devname);
602 }
603 return 0;
604 }
605
606 static void
cifs_show_upcall_target(struct seq_file * s,struct cifs_sb_info * cifs_sb)607 cifs_show_upcall_target(struct seq_file *s, struct cifs_sb_info *cifs_sb)
608 {
609 if (cifs_sb->ctx->upcall_target == UPTARGET_UNSPECIFIED) {
610 seq_puts(s, ",upcall_target=app");
611 return;
612 }
613
614 seq_puts(s, ",upcall_target=");
615
616 switch (cifs_sb->ctx->upcall_target) {
617 case UPTARGET_APP:
618 seq_puts(s, "app");
619 break;
620 case UPTARGET_MOUNT:
621 seq_puts(s, "mount");
622 break;
623 default:
624 /* shouldn't ever happen */
625 seq_puts(s, "unknown");
626 break;
627 }
628 }
629
630 /*
631 * cifs_show_options() is for displaying mount options in /proc/mounts.
632 * Not all settable options are displayed but most of the important
633 * ones are.
634 */
635 static int
cifs_show_options(struct seq_file * s,struct dentry * root)636 cifs_show_options(struct seq_file *s, struct dentry *root)
637 {
638 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
639 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
640 struct sockaddr *srcaddr;
641 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
642
643 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
644 cifs_show_security(s, tcon->ses);
645 cifs_show_cache_flavor(s, cifs_sb);
646 cifs_show_upcall_target(s, cifs_sb);
647
648 if (tcon->no_lease)
649 seq_puts(s, ",nolease");
650 if (cifs_sb->ctx->multiuser)
651 seq_puts(s, ",multiuser");
652 else if (tcon->ses->user_name)
653 seq_show_option(s, "username", tcon->ses->user_name);
654
655 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
656 seq_show_option(s, "domain", tcon->ses->domainName);
657
658 if (srcaddr->sa_family != AF_UNSPEC) {
659 struct sockaddr_in *saddr4;
660 struct sockaddr_in6 *saddr6;
661 saddr4 = (struct sockaddr_in *)srcaddr;
662 saddr6 = (struct sockaddr_in6 *)srcaddr;
663 if (srcaddr->sa_family == AF_INET6)
664 seq_printf(s, ",srcaddr=%pI6c",
665 &saddr6->sin6_addr);
666 else if (srcaddr->sa_family == AF_INET)
667 seq_printf(s, ",srcaddr=%pI4",
668 &saddr4->sin_addr.s_addr);
669 else
670 seq_printf(s, ",srcaddr=BAD-AF:%i",
671 (int)(srcaddr->sa_family));
672 }
673
674 seq_printf(s, ",uid=%u",
675 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
676 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
677 seq_puts(s, ",forceuid");
678 else
679 seq_puts(s, ",noforceuid");
680
681 seq_printf(s, ",gid=%u",
682 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
683 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
684 seq_puts(s, ",forcegid");
685 else
686 seq_puts(s, ",noforcegid");
687
688 cifs_show_address(s, tcon->ses->server);
689
690 if (!tcon->unix_ext)
691 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
692 cifs_sb->ctx->file_mode,
693 cifs_sb->ctx->dir_mode);
694 if (cifs_sb->ctx->iocharset)
695 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
696 if (tcon->ses->unicode == 0)
697 seq_puts(s, ",nounicode");
698 else if (tcon->ses->unicode == 1)
699 seq_puts(s, ",unicode");
700 if (tcon->seal)
701 seq_puts(s, ",seal");
702 else if (tcon->ses->server->ignore_signature)
703 seq_puts(s, ",signloosely");
704 if (tcon->nocase)
705 seq_puts(s, ",nocase");
706 if (tcon->nodelete)
707 seq_puts(s, ",nodelete");
708 if (cifs_sb->ctx->no_sparse)
709 seq_puts(s, ",nosparse");
710 if (tcon->local_lease)
711 seq_puts(s, ",locallease");
712 if (tcon->retry)
713 seq_puts(s, ",hard");
714 else
715 seq_puts(s, ",soft");
716 if (tcon->use_persistent)
717 seq_puts(s, ",persistenthandles");
718 else if (tcon->use_resilient)
719 seq_puts(s, ",resilienthandles");
720 if (tcon->posix_extensions)
721 seq_puts(s, ",posix");
722 else if (tcon->unix_ext)
723 seq_puts(s, ",unix");
724 else
725 seq_puts(s, ",nounix");
726 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
727 seq_puts(s, ",nodfs");
728 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
729 seq_puts(s, ",posixpaths");
730 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
731 seq_puts(s, ",setuids");
732 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
733 seq_puts(s, ",idsfromsid");
734 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
735 seq_puts(s, ",serverino");
736 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
737 seq_puts(s, ",rwpidforward");
738 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
739 seq_puts(s, ",forcemand");
740 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
741 seq_puts(s, ",nouser_xattr");
742 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
743 seq_puts(s, ",mapchars");
744 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
745 seq_puts(s, ",mapposix");
746 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
747 seq_puts(s, ",sfu");
748 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
749 seq_puts(s, ",nobrl");
750 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
751 seq_puts(s, ",nohandlecache");
752 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
753 seq_puts(s, ",modefromsid");
754 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
755 seq_puts(s, ",cifsacl");
756 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
757 seq_puts(s, ",dynperm");
758 if (root->d_sb->s_flags & SB_POSIXACL)
759 seq_puts(s, ",acl");
760 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
761 seq_puts(s, ",mfsymlinks");
762 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
763 seq_puts(s, ",fsc");
764 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
765 seq_puts(s, ",nostrictsync");
766 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
767 seq_puts(s, ",noperm");
768 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
769 seq_printf(s, ",backupuid=%u",
770 from_kuid_munged(&init_user_ns,
771 cifs_sb->ctx->backupuid));
772 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
773 seq_printf(s, ",backupgid=%u",
774 from_kgid_munged(&init_user_ns,
775 cifs_sb->ctx->backupgid));
776 seq_show_option(s, "reparse",
777 cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
778 if (cifs_sb->ctx->nonativesocket)
779 seq_puts(s, ",nonativesocket");
780 else
781 seq_puts(s, ",nativesocket");
782 seq_show_option(s, "symlink",
783 cifs_symlink_type_str(cifs_symlink_type(cifs_sb)));
784
785 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
786 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
787 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
788 if (cifs_sb->ctx->rasize)
789 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
790 if (tcon->ses->server->min_offload)
791 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
792 if (tcon->ses->server->retrans)
793 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans);
794 seq_printf(s, ",echo_interval=%lu",
795 tcon->ses->server->echo_interval / HZ);
796
797 /* Only display the following if overridden on mount */
798 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
799 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
800 if (tcon->ses->server->tcp_nodelay)
801 seq_puts(s, ",tcpnodelay");
802 if (tcon->ses->server->noautotune)
803 seq_puts(s, ",noautotune");
804 if (tcon->ses->server->noblocksnd)
805 seq_puts(s, ",noblocksend");
806 if (tcon->ses->server->nosharesock)
807 seq_puts(s, ",nosharesock");
808
809 if (tcon->snapshot_time)
810 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
811 if (tcon->handle_timeout)
812 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
813 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
814 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
815
816 /*
817 * Display file and directory attribute timeout in seconds.
818 * If file and directory attribute timeout the same then actimeo
819 * was likely specified on mount
820 */
821 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
822 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
823 else {
824 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
825 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
826 }
827 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
828
829 if (tcon->ses->chan_max > 1)
830 seq_printf(s, ",multichannel,max_channels=%zu",
831 tcon->ses->chan_max);
832
833 if (tcon->use_witness)
834 seq_puts(s, ",witness");
835
836 return 0;
837 }
838
cifs_umount_begin(struct super_block * sb)839 static void cifs_umount_begin(struct super_block *sb)
840 {
841 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
842 struct cifs_tcon *tcon;
843
844 if (cifs_sb == NULL)
845 return;
846
847 tcon = cifs_sb_master_tcon(cifs_sb);
848
849 spin_lock(&cifs_tcp_ses_lock);
850 spin_lock(&tcon->tc_lock);
851 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
852 netfs_trace_tcon_ref_see_umount);
853 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
854 /* we have other mounts to same share or we have
855 already tried to umount this and woken up
856 all waiting network requests, nothing to do */
857 spin_unlock(&tcon->tc_lock);
858 spin_unlock(&cifs_tcp_ses_lock);
859 return;
860 }
861 /*
862 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
863 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
864 */
865 spin_unlock(&tcon->tc_lock);
866 spin_unlock(&cifs_tcp_ses_lock);
867
868 cifs_close_all_deferred_files(tcon);
869 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
870 /* cancel_notify_requests(tcon); */
871 if (tcon->ses && tcon->ses->server) {
872 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
873 wake_up_all(&tcon->ses->server->request_q);
874 wake_up_all(&tcon->ses->server->response_q);
875 msleep(1); /* yield */
876 /* we have to kick the requests once more */
877 wake_up_all(&tcon->ses->server->response_q);
878 msleep(1);
879 }
880
881 return;
882 }
883
cifs_freeze(struct super_block * sb)884 static int cifs_freeze(struct super_block *sb)
885 {
886 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
887 struct cifs_tcon *tcon;
888
889 if (cifs_sb == NULL)
890 return 0;
891
892 tcon = cifs_sb_master_tcon(cifs_sb);
893
894 cifs_close_all_deferred_files(tcon);
895 return 0;
896 }
897
898 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)899 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
900 {
901 /* BB FIXME */
902 return 0;
903 }
904 #endif
905
cifs_write_inode(struct inode * inode,struct writeback_control * wbc)906 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
907 {
908 return netfs_unpin_writeback(inode, wbc);
909 }
910
cifs_drop_inode(struct inode * inode)911 static int cifs_drop_inode(struct inode *inode)
912 {
913 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
914
915 /* no serverino => unconditional eviction */
916 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
917 inode_generic_drop(inode);
918 }
919
920 static const struct super_operations cifs_super_ops = {
921 .statfs = cifs_statfs,
922 .alloc_inode = cifs_alloc_inode,
923 .write_inode = cifs_write_inode,
924 .free_inode = cifs_free_inode,
925 .drop_inode = cifs_drop_inode,
926 .evict_inode = cifs_evict_inode,
927 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
928 .show_devname = cifs_show_devname,
929 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
930 function unless later we add lazy close of inodes or unless the
931 kernel forgets to call us with the same number of releases (closes)
932 as opens */
933 .show_options = cifs_show_options,
934 .umount_begin = cifs_umount_begin,
935 .freeze_fs = cifs_freeze,
936 #ifdef CONFIG_CIFS_STATS2
937 .show_stats = cifs_show_stats,
938 #endif
939 };
940
941 /*
942 * Get root dentry from superblock according to prefix path mount option.
943 * Return dentry with refcount + 1 on success and NULL otherwise.
944 */
945 static struct dentry *
cifs_get_root(struct smb3_fs_context * ctx,struct super_block * sb)946 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
947 {
948 struct dentry *dentry;
949 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
950 char *full_path = NULL;
951 char *s, *p;
952 char sep;
953
954 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
955 return dget(sb->s_root);
956
957 full_path = cifs_build_path_to_root(ctx, cifs_sb,
958 cifs_sb_master_tcon(cifs_sb), 0);
959 if (full_path == NULL)
960 return ERR_PTR(-ENOMEM);
961
962 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
963
964 sep = CIFS_DIR_SEP(cifs_sb);
965 dentry = dget(sb->s_root);
966 s = full_path;
967
968 do {
969 struct inode *dir = d_inode(dentry);
970 struct dentry *child;
971
972 if (!S_ISDIR(dir->i_mode)) {
973 dput(dentry);
974 dentry = ERR_PTR(-ENOTDIR);
975 break;
976 }
977
978 /* skip separators */
979 while (*s == sep)
980 s++;
981 if (!*s)
982 break;
983 p = s++;
984 /* next separator */
985 while (*s && *s != sep)
986 s++;
987
988 child = lookup_noperm_positive_unlocked(&QSTR_LEN(p, s - p),
989 dentry);
990 dput(dentry);
991 dentry = child;
992 } while (!IS_ERR(dentry));
993 kfree(full_path);
994 return dentry;
995 }
996
cifs_set_super(struct super_block * sb,void * data)997 static int cifs_set_super(struct super_block *sb, void *data)
998 {
999 struct cifs_mnt_data *mnt_data = data;
1000 sb->s_fs_info = mnt_data->cifs_sb;
1001 return set_anon_super(sb, NULL);
1002 }
1003
1004 struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,struct smb3_fs_context * old_ctx)1005 cifs_smb3_do_mount(struct file_system_type *fs_type,
1006 int flags, struct smb3_fs_context *old_ctx)
1007 {
1008 struct cifs_mnt_data mnt_data;
1009 struct cifs_sb_info *cifs_sb;
1010 struct super_block *sb;
1011 struct dentry *root;
1012 int rc;
1013
1014 if (cifsFYI) {
1015 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
1016 old_ctx->source, flags);
1017 } else {
1018 cifs_info("Attempting to mount %s\n", old_ctx->source);
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 if (mempool_init_slab_pool(&cifs_mid_pool, 3, cifs_mid_cachep) < 0) {
1851 kmem_cache_destroy(cifs_mid_cachep);
1852 return -ENOMEM;
1853 }
1854
1855 return 0;
1856 }
1857
destroy_mids(void)1858 static void destroy_mids(void)
1859 {
1860 mempool_exit(&cifs_mid_pool);
1861 kmem_cache_destroy(cifs_mid_cachep);
1862 }
1863
cifs_init_netfs(void)1864 static int cifs_init_netfs(void)
1865 {
1866 cifs_io_request_cachep =
1867 kmem_cache_create("cifs_io_request",
1868 sizeof(struct cifs_io_request), 0,
1869 SLAB_HWCACHE_ALIGN, NULL);
1870 if (!cifs_io_request_cachep)
1871 goto nomem_req;
1872
1873 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
1874 goto nomem_reqpool;
1875
1876 cifs_io_subrequest_cachep =
1877 kmem_cache_create("cifs_io_subrequest",
1878 sizeof(struct cifs_io_subrequest), 0,
1879 SLAB_HWCACHE_ALIGN, NULL);
1880 if (!cifs_io_subrequest_cachep)
1881 goto nomem_subreq;
1882
1883 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
1884 goto nomem_subreqpool;
1885
1886 return 0;
1887
1888 nomem_subreqpool:
1889 kmem_cache_destroy(cifs_io_subrequest_cachep);
1890 nomem_subreq:
1891 mempool_exit(&cifs_io_request_pool);
1892 nomem_reqpool:
1893 kmem_cache_destroy(cifs_io_request_cachep);
1894 nomem_req:
1895 return -ENOMEM;
1896 }
1897
cifs_destroy_netfs(void)1898 static void cifs_destroy_netfs(void)
1899 {
1900 mempool_exit(&cifs_io_subrequest_pool);
1901 kmem_cache_destroy(cifs_io_subrequest_cachep);
1902 mempool_exit(&cifs_io_request_pool);
1903 kmem_cache_destroy(cifs_io_request_cachep);
1904 }
1905
1906 static int __init
init_cifs(void)1907 init_cifs(void)
1908 {
1909 int rc = 0;
1910 cifs_proc_init();
1911 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1912 /*
1913 * Initialize Global counters
1914 */
1915 atomic_set(&sesInfoAllocCount, 0);
1916 atomic_set(&tconInfoAllocCount, 0);
1917 atomic_set(&tcpSesNextId, 0);
1918 atomic_set(&tcpSesAllocCount, 0);
1919 atomic_set(&tcpSesReconnectCount, 0);
1920 atomic_set(&tconInfoReconnectCount, 0);
1921
1922 atomic_set(&buf_alloc_count, 0);
1923 atomic_set(&small_buf_alloc_count, 0);
1924 #ifdef CONFIG_CIFS_STATS2
1925 atomic_set(&total_buf_alloc_count, 0);
1926 atomic_set(&total_small_buf_alloc_count, 0);
1927 if (slow_rsp_threshold < 1)
1928 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1929 else if (slow_rsp_threshold > 32767)
1930 cifs_dbg(VFS,
1931 "slow response threshold set higher than recommended (0 to 32767)\n");
1932 #endif /* CONFIG_CIFS_STATS2 */
1933
1934 atomic_set(&mid_count, 0);
1935 GlobalCurrentXid = 0;
1936 GlobalTotalActiveXid = 0;
1937 GlobalMaxActiveXid = 0;
1938
1939 cifs_lock_secret = get_random_u32();
1940
1941 if (cifs_max_pending < 2) {
1942 cifs_max_pending = 2;
1943 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1944 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1945 cifs_max_pending = CIFS_MAX_REQ;
1946 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1947 CIFS_MAX_REQ);
1948 }
1949
1950 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1951 if (dir_cache_timeout > 65000) {
1952 dir_cache_timeout = 65000;
1953 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1954 }
1955
1956 cifsiod_wq = alloc_workqueue("cifsiod",
1957 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1958 0);
1959 if (!cifsiod_wq) {
1960 rc = -ENOMEM;
1961 goto out_clean_proc;
1962 }
1963
1964 /*
1965 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1966 * so that we don't launch too many worker threads but
1967 * Documentation/core-api/workqueue.rst recommends setting it to 0
1968 */
1969
1970 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1971 decrypt_wq = alloc_workqueue("smb3decryptd",
1972 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1973 if (!decrypt_wq) {
1974 rc = -ENOMEM;
1975 goto out_destroy_cifsiod_wq;
1976 }
1977
1978 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1979 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1980 if (!fileinfo_put_wq) {
1981 rc = -ENOMEM;
1982 goto out_destroy_decrypt_wq;
1983 }
1984
1985 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1986 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1987 0);
1988 if (!cifsoplockd_wq) {
1989 rc = -ENOMEM;
1990 goto out_destroy_fileinfo_put_wq;
1991 }
1992
1993 deferredclose_wq = alloc_workqueue("deferredclose",
1994 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1995 0);
1996 if (!deferredclose_wq) {
1997 rc = -ENOMEM;
1998 goto out_destroy_cifsoplockd_wq;
1999 }
2000
2001 serverclose_wq = alloc_workqueue("serverclose",
2002 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2003 0);
2004 if (!serverclose_wq) {
2005 rc = -ENOMEM;
2006 goto out_destroy_deferredclose_wq;
2007 }
2008
2009 cfid_put_wq = alloc_workqueue("cfid_put_wq",
2010 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2011 0);
2012 if (!cfid_put_wq) {
2013 rc = -ENOMEM;
2014 goto out_destroy_serverclose_wq;
2015 }
2016
2017 rc = cifs_init_inodecache();
2018 if (rc)
2019 goto out_destroy_cfid_put_wq;
2020
2021 rc = cifs_init_netfs();
2022 if (rc)
2023 goto out_destroy_inodecache;
2024
2025 rc = init_mids();
2026 if (rc)
2027 goto out_destroy_netfs;
2028
2029 rc = cifs_init_request_bufs();
2030 if (rc)
2031 goto out_destroy_mids;
2032
2033 #ifdef CONFIG_CIFS_DFS_UPCALL
2034 rc = dfs_cache_init();
2035 if (rc)
2036 goto out_destroy_request_bufs;
2037 #endif /* CONFIG_CIFS_DFS_UPCALL */
2038 #ifdef CONFIG_CIFS_UPCALL
2039 rc = init_cifs_spnego();
2040 if (rc)
2041 goto out_destroy_dfs_cache;
2042 #endif /* CONFIG_CIFS_UPCALL */
2043 #ifdef CONFIG_CIFS_SWN_UPCALL
2044 rc = cifs_genl_init();
2045 if (rc)
2046 goto out_register_key_type;
2047 #endif /* CONFIG_CIFS_SWN_UPCALL */
2048
2049 rc = init_cifs_idmap();
2050 if (rc)
2051 goto out_cifs_swn_init;
2052
2053 rc = register_filesystem(&cifs_fs_type);
2054 if (rc)
2055 goto out_init_cifs_idmap;
2056
2057 rc = register_filesystem(&smb3_fs_type);
2058 if (rc) {
2059 unregister_filesystem(&cifs_fs_type);
2060 goto out_init_cifs_idmap;
2061 }
2062
2063 return 0;
2064
2065 out_init_cifs_idmap:
2066 exit_cifs_idmap();
2067 out_cifs_swn_init:
2068 #ifdef CONFIG_CIFS_SWN_UPCALL
2069 cifs_genl_exit();
2070 out_register_key_type:
2071 #endif
2072 #ifdef CONFIG_CIFS_UPCALL
2073 exit_cifs_spnego();
2074 out_destroy_dfs_cache:
2075 #endif
2076 #ifdef CONFIG_CIFS_DFS_UPCALL
2077 dfs_cache_destroy();
2078 out_destroy_request_bufs:
2079 #endif
2080 cifs_destroy_request_bufs();
2081 out_destroy_mids:
2082 destroy_mids();
2083 out_destroy_netfs:
2084 cifs_destroy_netfs();
2085 out_destroy_inodecache:
2086 cifs_destroy_inodecache();
2087 out_destroy_cfid_put_wq:
2088 destroy_workqueue(cfid_put_wq);
2089 out_destroy_serverclose_wq:
2090 destroy_workqueue(serverclose_wq);
2091 out_destroy_deferredclose_wq:
2092 destroy_workqueue(deferredclose_wq);
2093 out_destroy_cifsoplockd_wq:
2094 destroy_workqueue(cifsoplockd_wq);
2095 out_destroy_fileinfo_put_wq:
2096 destroy_workqueue(fileinfo_put_wq);
2097 out_destroy_decrypt_wq:
2098 destroy_workqueue(decrypt_wq);
2099 out_destroy_cifsiod_wq:
2100 destroy_workqueue(cifsiod_wq);
2101 out_clean_proc:
2102 cifs_proc_clean();
2103 return rc;
2104 }
2105
2106 static void __exit
exit_cifs(void)2107 exit_cifs(void)
2108 {
2109 cifs_dbg(NOISY, "exit_smb3\n");
2110 unregister_filesystem(&cifs_fs_type);
2111 unregister_filesystem(&smb3_fs_type);
2112 cifs_release_automount_timer();
2113 exit_cifs_idmap();
2114 #ifdef CONFIG_CIFS_SWN_UPCALL
2115 cifs_genl_exit();
2116 #endif
2117 #ifdef CONFIG_CIFS_UPCALL
2118 exit_cifs_spnego();
2119 #endif
2120 #ifdef CONFIG_CIFS_DFS_UPCALL
2121 dfs_cache_destroy();
2122 #endif
2123 cifs_destroy_request_bufs();
2124 destroy_mids();
2125 cifs_destroy_netfs();
2126 cifs_destroy_inodecache();
2127 destroy_workqueue(deferredclose_wq);
2128 destroy_workqueue(cifsoplockd_wq);
2129 destroy_workqueue(decrypt_wq);
2130 destroy_workqueue(fileinfo_put_wq);
2131 destroy_workqueue(serverclose_wq);
2132 destroy_workqueue(cfid_put_wq);
2133 destroy_workqueue(cifsiod_wq);
2134 cifs_proc_clean();
2135 }
2136
2137 MODULE_AUTHOR("Steve French");
2138 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2139 MODULE_DESCRIPTION
2140 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2141 "also older servers complying with the SNIA CIFS Specification)");
2142 MODULE_VERSION(CIFS_VERSION);
2143 MODULE_SOFTDEP("ecb");
2144 MODULE_SOFTDEP("nls");
2145 MODULE_SOFTDEP("aes");
2146 MODULE_SOFTDEP("cmac");
2147 MODULE_SOFTDEP("aead2");
2148 MODULE_SOFTDEP("ccm");
2149 MODULE_SOFTDEP("gcm");
2150 module_init(init_cifs)
2151 module_exit(exit_cifs)
2152