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 /* Check if file is oplocked if this is request for new lease */
1153 if (arg == F_UNLCK ||
1154 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1155 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1156 return generic_setlease(file, arg, lease, priv);
1157 else if (tlink_tcon(cfile->tlink)->local_lease &&
1158 !CIFS_CACHE_READ(CIFS_I(inode)))
1159 /*
1160 * If the server claims to support oplock on this file, then we
1161 * still need to check oplock even if the local_lease mount
1162 * option is set, but there are servers which do not support
1163 * oplock for which this mount option may be useful if the user
1164 * knows that the file won't be changed on the server by anyone
1165 * else.
1166 */
1167 return generic_setlease(file, arg, lease, priv);
1168 else
1169 return -EAGAIN;
1170 }
1171
1172 struct file_system_type cifs_fs_type = {
1173 .owner = THIS_MODULE,
1174 .name = "cifs",
1175 .init_fs_context = smb3_init_fs_context,
1176 .parameters = smb3_fs_parameters,
1177 .kill_sb = cifs_kill_sb,
1178 .fs_flags = FS_RENAME_DOES_D_MOVE,
1179 };
1180 MODULE_ALIAS_FS("cifs");
1181
1182 struct file_system_type smb3_fs_type = {
1183 .owner = THIS_MODULE,
1184 .name = "smb3",
1185 .init_fs_context = smb3_init_fs_context,
1186 .parameters = smb3_fs_parameters,
1187 .kill_sb = cifs_kill_sb,
1188 .fs_flags = FS_RENAME_DOES_D_MOVE,
1189 };
1190 MODULE_ALIAS_FS("smb3");
1191 MODULE_ALIAS("smb3");
1192
1193 const struct inode_operations cifs_dir_inode_ops = {
1194 .create = cifs_create,
1195 .atomic_open = cifs_atomic_open,
1196 .lookup = cifs_lookup,
1197 .getattr = cifs_getattr,
1198 .unlink = cifs_unlink,
1199 .link = cifs_hardlink,
1200 .mkdir = cifs_mkdir,
1201 .rmdir = cifs_rmdir,
1202 .rename = cifs_rename2,
1203 .permission = cifs_permission,
1204 .setattr = cifs_setattr,
1205 .symlink = cifs_symlink,
1206 .mknod = cifs_mknod,
1207 .listxattr = cifs_listxattr,
1208 .get_acl = cifs_get_acl,
1209 .set_acl = cifs_set_acl,
1210 };
1211
1212 const struct inode_operations cifs_file_inode_ops = {
1213 .setattr = cifs_setattr,
1214 .getattr = cifs_getattr,
1215 .permission = cifs_permission,
1216 .listxattr = cifs_listxattr,
1217 .fiemap = cifs_fiemap,
1218 .get_acl = cifs_get_acl,
1219 .set_acl = cifs_set_acl,
1220 };
1221
cifs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1222 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1223 struct delayed_call *done)
1224 {
1225 char *target_path;
1226
1227 if (!dentry)
1228 return ERR_PTR(-ECHILD);
1229
1230 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1231 if (!target_path)
1232 return ERR_PTR(-ENOMEM);
1233
1234 spin_lock(&inode->i_lock);
1235 if (likely(CIFS_I(inode)->symlink_target)) {
1236 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1237 } else {
1238 kfree(target_path);
1239 target_path = ERR_PTR(-EOPNOTSUPP);
1240 }
1241 spin_unlock(&inode->i_lock);
1242
1243 if (!IS_ERR(target_path))
1244 set_delayed_call(done, kfree_link, target_path);
1245
1246 return target_path;
1247 }
1248
1249 const struct inode_operations cifs_symlink_inode_ops = {
1250 .get_link = cifs_get_link,
1251 .setattr = cifs_setattr,
1252 .permission = cifs_permission,
1253 .listxattr = cifs_listxattr,
1254 };
1255
1256 /*
1257 * Advance the EOF marker to after the source range.
1258 */
cifs_precopy_set_eof(struct inode * src_inode,struct cifsInodeInfo * src_cifsi,struct cifs_tcon * src_tcon,unsigned int xid,loff_t src_end)1259 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1260 struct cifs_tcon *src_tcon,
1261 unsigned int xid, loff_t src_end)
1262 {
1263 struct cifsFileInfo *writeable_srcfile;
1264 int rc = -EINVAL;
1265
1266 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1267 if (writeable_srcfile) {
1268 if (src_tcon->ses->server->ops->set_file_size)
1269 rc = src_tcon->ses->server->ops->set_file_size(
1270 xid, src_tcon, writeable_srcfile,
1271 src_inode->i_size, true /* no need to set sparse */);
1272 else
1273 rc = -ENOSYS;
1274 cifsFileInfo_put(writeable_srcfile);
1275 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1276 }
1277
1278 if (rc < 0)
1279 goto set_failed;
1280
1281 netfs_resize_file(&src_cifsi->netfs, src_end, true);
1282 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1283 return 0;
1284
1285 set_failed:
1286 return filemap_write_and_wait(src_inode->i_mapping);
1287 }
1288
1289 /*
1290 * Flush out either the folio that overlaps the beginning of a range in which
1291 * pos resides or the folio that overlaps the end of a range unless that folio
1292 * is entirely within the range we're going to invalidate. We extend the flush
1293 * bounds to encompass the folio.
1294 */
cifs_flush_folio(struct inode * inode,loff_t pos,loff_t * _fstart,loff_t * _fend,bool first)1295 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1296 bool first)
1297 {
1298 struct folio *folio;
1299 unsigned long long fpos, fend;
1300 pgoff_t index = pos / PAGE_SIZE;
1301 size_t size;
1302 int rc = 0;
1303
1304 folio = filemap_get_folio(inode->i_mapping, index);
1305 if (IS_ERR(folio))
1306 return 0;
1307
1308 size = folio_size(folio);
1309 fpos = folio_pos(folio);
1310 fend = fpos + size - 1;
1311 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1312 *_fend = max_t(unsigned long long, *_fend, fend);
1313 if ((first && pos == fpos) || (!first && pos == fend))
1314 goto out;
1315
1316 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1317 out:
1318 folio_put(folio);
1319 return rc;
1320 }
1321
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)1322 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1323 struct file *dst_file, loff_t destoff, loff_t len,
1324 unsigned int remap_flags)
1325 {
1326 struct inode *src_inode = file_inode(src_file);
1327 struct inode *target_inode = file_inode(dst_file);
1328 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1329 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1330 struct cifsFileInfo *smb_file_src = src_file->private_data;
1331 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1332 struct cifs_tcon *target_tcon, *src_tcon;
1333 unsigned long long destend, fstart, fend, old_size, new_size;
1334 unsigned int xid;
1335 int rc;
1336
1337 if (remap_flags & REMAP_FILE_DEDUP)
1338 return -EOPNOTSUPP;
1339 if (remap_flags & ~REMAP_FILE_ADVISORY)
1340 return -EINVAL;
1341
1342 cifs_dbg(FYI, "clone range\n");
1343
1344 xid = get_xid();
1345
1346 if (!smb_file_src || !smb_file_target) {
1347 rc = -EBADF;
1348 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1349 goto out;
1350 }
1351
1352 src_tcon = tlink_tcon(smb_file_src->tlink);
1353 target_tcon = tlink_tcon(smb_file_target->tlink);
1354
1355 /*
1356 * Note: cifs case is easier than btrfs since server responsible for
1357 * checks for proper open modes and file type and if it wants
1358 * server could even support copy of range where source = target
1359 */
1360 lock_two_nondirectories(target_inode, src_inode);
1361
1362 if (len == 0)
1363 len = src_inode->i_size - off;
1364
1365 cifs_dbg(FYI, "clone range\n");
1366
1367 /* Flush the source buffer */
1368 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1369 off + len - 1);
1370 if (rc)
1371 goto unlock;
1372
1373 /* The server-side copy will fail if the source crosses the EOF marker.
1374 * Advance the EOF marker after the flush above to the end of the range
1375 * if it's short of that.
1376 */
1377 if (src_cifsi->netfs.remote_i_size < off + len) {
1378 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1379 if (rc < 0)
1380 goto unlock;
1381 }
1382
1383 new_size = destoff + len;
1384 destend = destoff + len - 1;
1385
1386 /* Flush the folios at either end of the destination range to prevent
1387 * accidental loss of dirty data outside of the range.
1388 */
1389 fstart = destoff;
1390 fend = destend;
1391
1392 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1393 if (rc)
1394 goto unlock;
1395 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1396 if (rc)
1397 goto unlock;
1398 if (fend > target_cifsi->netfs.zero_point)
1399 target_cifsi->netfs.zero_point = fend + 1;
1400 old_size = target_cifsi->netfs.remote_i_size;
1401
1402 /* Discard all the folios that overlap the destination region. */
1403 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1404 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1405
1406 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1407 i_size_read(target_inode), 0);
1408
1409 rc = -EOPNOTSUPP;
1410 if (target_tcon->ses->server->ops->duplicate_extents) {
1411 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1412 smb_file_src, smb_file_target, off, len, destoff);
1413 if (rc == 0 && new_size > old_size) {
1414 truncate_setsize(target_inode, new_size);
1415 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1416 new_size);
1417 } else if (rc == -EOPNOTSUPP) {
1418 /*
1419 * copy_file_range syscall man page indicates EINVAL
1420 * is returned e.g when "fd_in and fd_out refer to the
1421 * same file and the source and target ranges overlap."
1422 * Test generic/157 was what showed these cases where
1423 * we need to remap EOPNOTSUPP to EINVAL
1424 */
1425 if (off >= src_inode->i_size) {
1426 rc = -EINVAL;
1427 } else if (src_inode == target_inode) {
1428 if (off + len > destoff)
1429 rc = -EINVAL;
1430 }
1431 }
1432 if (rc == 0 && new_size > target_cifsi->netfs.zero_point)
1433 target_cifsi->netfs.zero_point = new_size;
1434 }
1435
1436 /* force revalidate of size and timestamps of target file now
1437 that target is updated on the server */
1438 CIFS_I(target_inode)->time = 0;
1439 unlock:
1440 /* although unlocking in the reverse order from locking is not
1441 strictly necessary here it is a little cleaner to be consistent */
1442 unlock_two_nondirectories(src_inode, target_inode);
1443 out:
1444 free_xid(xid);
1445 return rc < 0 ? rc : len;
1446 }
1447
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)1448 ssize_t cifs_file_copychunk_range(unsigned int xid,
1449 struct file *src_file, loff_t off,
1450 struct file *dst_file, loff_t destoff,
1451 size_t len, unsigned int flags)
1452 {
1453 struct inode *src_inode = file_inode(src_file);
1454 struct inode *target_inode = file_inode(dst_file);
1455 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1456 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1457 struct cifsFileInfo *smb_file_src;
1458 struct cifsFileInfo *smb_file_target;
1459 struct cifs_tcon *src_tcon;
1460 struct cifs_tcon *target_tcon;
1461 ssize_t rc;
1462
1463 cifs_dbg(FYI, "copychunk range\n");
1464
1465 if (!src_file->private_data || !dst_file->private_data) {
1466 rc = -EBADF;
1467 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1468 goto out;
1469 }
1470
1471 rc = -EXDEV;
1472 smb_file_target = dst_file->private_data;
1473 smb_file_src = src_file->private_data;
1474 src_tcon = tlink_tcon(smb_file_src->tlink);
1475 target_tcon = tlink_tcon(smb_file_target->tlink);
1476
1477 if (src_tcon->ses != target_tcon->ses) {
1478 cifs_dbg(FYI, "source and target of copy not on same server\n");
1479 goto out;
1480 }
1481
1482 rc = -EOPNOTSUPP;
1483 if (!target_tcon->ses->server->ops->copychunk_range)
1484 goto out;
1485
1486 /*
1487 * Note: cifs case is easier than btrfs since server responsible for
1488 * checks for proper open modes and file type and if it wants
1489 * server could even support copy of range where source = target
1490 */
1491 lock_two_nondirectories(target_inode, src_inode);
1492
1493 cifs_dbg(FYI, "about to flush pages\n");
1494
1495 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1496 off + len - 1);
1497 if (rc)
1498 goto unlock;
1499
1500 /* The server-side copy will fail if the source crosses the EOF marker.
1501 * Advance the EOF marker after the flush above to the end of the range
1502 * if it's short of that.
1503 */
1504 if (src_cifsi->netfs.remote_i_size < off + len) {
1505 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1506 if (rc < 0)
1507 goto unlock;
1508 }
1509
1510 /* Flush and invalidate all the folios in the destination region. If
1511 * the copy was successful, then some of the flush is extra overhead,
1512 * but we need to allow for the copy failing in some way (eg. ENOSPC).
1513 */
1514 rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
1515 if (rc)
1516 goto unlock;
1517
1518 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1519 i_size_read(target_inode), 0);
1520
1521 rc = file_modified(dst_file);
1522 if (!rc) {
1523 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1524 smb_file_src, smb_file_target, off, len, destoff);
1525 if (rc > 0 && destoff + rc > i_size_read(target_inode)) {
1526 truncate_setsize(target_inode, destoff + rc);
1527 netfs_resize_file(&target_cifsi->netfs,
1528 i_size_read(target_inode), true);
1529 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1530 i_size_read(target_inode));
1531 }
1532 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point)
1533 target_cifsi->netfs.zero_point = destoff + rc;
1534 }
1535
1536 file_accessed(src_file);
1537
1538 /* force revalidate of size and timestamps of target file now
1539 * that target is updated on the server
1540 */
1541 CIFS_I(target_inode)->time = 0;
1542
1543 unlock:
1544 /* although unlocking in the reverse order from locking is not
1545 * strictly necessary here it is a little cleaner to be consistent
1546 */
1547 unlock_two_nondirectories(src_inode, target_inode);
1548
1549 out:
1550 return rc;
1551 }
1552
1553 /*
1554 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1555 * is a dummy operation.
1556 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1557 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1558 {
1559 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1560 file, datasync);
1561
1562 return 0;
1563 }
1564
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1565 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1566 struct file *dst_file, loff_t destoff,
1567 size_t len, unsigned int flags)
1568 {
1569 unsigned int xid = get_xid();
1570 ssize_t rc;
1571 struct cifsFileInfo *cfile = dst_file->private_data;
1572
1573 if (cfile->swapfile) {
1574 rc = -EOPNOTSUPP;
1575 free_xid(xid);
1576 return rc;
1577 }
1578
1579 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1580 len, flags);
1581 free_xid(xid);
1582
1583 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1584 rc = splice_copy_file_range(src_file, off, dst_file,
1585 destoff, len);
1586 return rc;
1587 }
1588
1589 const struct file_operations cifs_file_ops = {
1590 .read_iter = cifs_loose_read_iter,
1591 .write_iter = cifs_file_write_iter,
1592 .open = cifs_open,
1593 .release = cifs_close,
1594 .lock = cifs_lock,
1595 .flock = cifs_flock,
1596 .fsync = cifs_fsync,
1597 .flush = cifs_flush,
1598 .mmap_prepare = cifs_file_mmap_prepare,
1599 .splice_read = filemap_splice_read,
1600 .splice_write = iter_file_splice_write,
1601 .llseek = cifs_llseek,
1602 .unlocked_ioctl = cifs_ioctl,
1603 .copy_file_range = cifs_copy_file_range,
1604 .remap_file_range = cifs_remap_file_range,
1605 .setlease = cifs_setlease,
1606 .fallocate = cifs_fallocate,
1607 };
1608
1609 const struct file_operations cifs_file_strict_ops = {
1610 .read_iter = cifs_strict_readv,
1611 .write_iter = cifs_strict_writev,
1612 .open = cifs_open,
1613 .release = cifs_close,
1614 .lock = cifs_lock,
1615 .flock = cifs_flock,
1616 .fsync = cifs_strict_fsync,
1617 .flush = cifs_flush,
1618 .mmap_prepare = cifs_file_strict_mmap_prepare,
1619 .splice_read = filemap_splice_read,
1620 .splice_write = iter_file_splice_write,
1621 .llseek = cifs_llseek,
1622 .unlocked_ioctl = cifs_ioctl,
1623 .copy_file_range = cifs_copy_file_range,
1624 .remap_file_range = cifs_remap_file_range,
1625 .setlease = cifs_setlease,
1626 .fallocate = cifs_fallocate,
1627 };
1628
1629 const struct file_operations cifs_file_direct_ops = {
1630 .read_iter = netfs_unbuffered_read_iter,
1631 .write_iter = netfs_file_write_iter,
1632 .open = cifs_open,
1633 .release = cifs_close,
1634 .lock = cifs_lock,
1635 .flock = cifs_flock,
1636 .fsync = cifs_fsync,
1637 .flush = cifs_flush,
1638 .mmap_prepare = cifs_file_mmap_prepare,
1639 .splice_read = copy_splice_read,
1640 .splice_write = iter_file_splice_write,
1641 .unlocked_ioctl = cifs_ioctl,
1642 .copy_file_range = cifs_copy_file_range,
1643 .remap_file_range = cifs_remap_file_range,
1644 .llseek = cifs_llseek,
1645 .setlease = cifs_setlease,
1646 .fallocate = cifs_fallocate,
1647 };
1648
1649 const struct file_operations cifs_file_nobrl_ops = {
1650 .read_iter = cifs_loose_read_iter,
1651 .write_iter = cifs_file_write_iter,
1652 .open = cifs_open,
1653 .release = cifs_close,
1654 .fsync = cifs_fsync,
1655 .flush = cifs_flush,
1656 .mmap_prepare = cifs_file_mmap_prepare,
1657 .splice_read = filemap_splice_read,
1658 .splice_write = iter_file_splice_write,
1659 .llseek = cifs_llseek,
1660 .unlocked_ioctl = cifs_ioctl,
1661 .copy_file_range = cifs_copy_file_range,
1662 .remap_file_range = cifs_remap_file_range,
1663 .setlease = cifs_setlease,
1664 .fallocate = cifs_fallocate,
1665 };
1666
1667 const struct file_operations cifs_file_strict_nobrl_ops = {
1668 .read_iter = cifs_strict_readv,
1669 .write_iter = cifs_strict_writev,
1670 .open = cifs_open,
1671 .release = cifs_close,
1672 .fsync = cifs_strict_fsync,
1673 .flush = cifs_flush,
1674 .mmap_prepare = cifs_file_strict_mmap_prepare,
1675 .splice_read = filemap_splice_read,
1676 .splice_write = iter_file_splice_write,
1677 .llseek = cifs_llseek,
1678 .unlocked_ioctl = cifs_ioctl,
1679 .copy_file_range = cifs_copy_file_range,
1680 .remap_file_range = cifs_remap_file_range,
1681 .setlease = cifs_setlease,
1682 .fallocate = cifs_fallocate,
1683 };
1684
1685 const struct file_operations cifs_file_direct_nobrl_ops = {
1686 .read_iter = netfs_unbuffered_read_iter,
1687 .write_iter = netfs_file_write_iter,
1688 .open = cifs_open,
1689 .release = cifs_close,
1690 .fsync = cifs_fsync,
1691 .flush = cifs_flush,
1692 .mmap_prepare = cifs_file_mmap_prepare,
1693 .splice_read = copy_splice_read,
1694 .splice_write = iter_file_splice_write,
1695 .unlocked_ioctl = cifs_ioctl,
1696 .copy_file_range = cifs_copy_file_range,
1697 .remap_file_range = cifs_remap_file_range,
1698 .llseek = cifs_llseek,
1699 .setlease = cifs_setlease,
1700 .fallocate = cifs_fallocate,
1701 };
1702
1703 const struct file_operations cifs_dir_ops = {
1704 .iterate_shared = cifs_readdir,
1705 .release = cifs_closedir,
1706 .read = generic_read_dir,
1707 .unlocked_ioctl = cifs_ioctl,
1708 .copy_file_range = cifs_copy_file_range,
1709 .remap_file_range = cifs_remap_file_range,
1710 .llseek = generic_file_llseek,
1711 .fsync = cifs_dir_fsync,
1712 .setlease = simple_nosetlease,
1713 };
1714
1715 static void
cifs_init_once(void * inode)1716 cifs_init_once(void *inode)
1717 {
1718 struct cifsInodeInfo *cifsi = inode;
1719
1720 inode_init_once(&cifsi->netfs.inode);
1721 init_rwsem(&cifsi->lock_sem);
1722 }
1723
1724 static int __init
cifs_init_inodecache(void)1725 cifs_init_inodecache(void)
1726 {
1727 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1728 sizeof(struct cifsInodeInfo),
1729 0, (SLAB_RECLAIM_ACCOUNT|
1730 SLAB_ACCOUNT),
1731 cifs_init_once);
1732 if (cifs_inode_cachep == NULL)
1733 return -ENOMEM;
1734
1735 return 0;
1736 }
1737
1738 static void
cifs_destroy_inodecache(void)1739 cifs_destroy_inodecache(void)
1740 {
1741 /*
1742 * Make sure all delayed rcu free inodes are flushed before we
1743 * destroy cache.
1744 */
1745 rcu_barrier();
1746 kmem_cache_destroy(cifs_inode_cachep);
1747 }
1748
1749 static int
cifs_init_request_bufs(void)1750 cifs_init_request_bufs(void)
1751 {
1752 /*
1753 * SMB2 maximum header size is bigger than CIFS one - no problems to
1754 * allocate some more bytes for CIFS.
1755 */
1756 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1757
1758 if (CIFSMaxBufSize < 8192) {
1759 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1760 Unicode path name has to fit in any SMB/CIFS path based frames */
1761 CIFSMaxBufSize = 8192;
1762 } else if (CIFSMaxBufSize > 1024*127) {
1763 CIFSMaxBufSize = 1024 * 127;
1764 } else {
1765 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1766 }
1767 /*
1768 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1769 CIFSMaxBufSize, CIFSMaxBufSize);
1770 */
1771 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1772 CIFSMaxBufSize + max_hdr_size, 0,
1773 SLAB_HWCACHE_ALIGN, 0,
1774 CIFSMaxBufSize + max_hdr_size,
1775 NULL);
1776 if (cifs_req_cachep == NULL)
1777 return -ENOMEM;
1778
1779 if (cifs_min_rcv < 1)
1780 cifs_min_rcv = 1;
1781 else if (cifs_min_rcv > 64) {
1782 cifs_min_rcv = 64;
1783 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1784 }
1785
1786 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1787 cifs_req_cachep);
1788
1789 if (cifs_req_poolp == NULL) {
1790 kmem_cache_destroy(cifs_req_cachep);
1791 return -ENOMEM;
1792 }
1793 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1794 almost all handle based requests (but not write response, nor is it
1795 sufficient for path based requests). A smaller size would have
1796 been more efficient (compacting multiple slab items on one 4k page)
1797 for the case in which debug was on, but this larger size allows
1798 more SMBs to use small buffer alloc and is still much more
1799 efficient to alloc 1 per page off the slab compared to 17K (5page)
1800 alloc of large cifs buffers even when page debugging is on */
1801 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1802 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1803 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1804 if (cifs_sm_req_cachep == NULL) {
1805 mempool_destroy(cifs_req_poolp);
1806 kmem_cache_destroy(cifs_req_cachep);
1807 return -ENOMEM;
1808 }
1809
1810 if (cifs_min_small < 2)
1811 cifs_min_small = 2;
1812 else if (cifs_min_small > 256) {
1813 cifs_min_small = 256;
1814 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1815 }
1816
1817 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1818 cifs_sm_req_cachep);
1819
1820 if (cifs_sm_req_poolp == NULL) {
1821 mempool_destroy(cifs_req_poolp);
1822 kmem_cache_destroy(cifs_req_cachep);
1823 kmem_cache_destroy(cifs_sm_req_cachep);
1824 return -ENOMEM;
1825 }
1826
1827 return 0;
1828 }
1829
1830 static void
cifs_destroy_request_bufs(void)1831 cifs_destroy_request_bufs(void)
1832 {
1833 mempool_destroy(cifs_req_poolp);
1834 kmem_cache_destroy(cifs_req_cachep);
1835 mempool_destroy(cifs_sm_req_poolp);
1836 kmem_cache_destroy(cifs_sm_req_cachep);
1837 }
1838
init_mids(void)1839 static int init_mids(void)
1840 {
1841 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1842 sizeof(struct mid_q_entry), 0,
1843 SLAB_HWCACHE_ALIGN, NULL);
1844 if (cifs_mid_cachep == NULL)
1845 return -ENOMEM;
1846
1847 /* 3 is a reasonable minimum number of simultaneous operations */
1848 if (mempool_init_slab_pool(&cifs_mid_pool, 3, cifs_mid_cachep) < 0) {
1849 kmem_cache_destroy(cifs_mid_cachep);
1850 return -ENOMEM;
1851 }
1852
1853 return 0;
1854 }
1855
destroy_mids(void)1856 static void destroy_mids(void)
1857 {
1858 mempool_exit(&cifs_mid_pool);
1859 kmem_cache_destroy(cifs_mid_cachep);
1860 }
1861
cifs_init_netfs(void)1862 static int cifs_init_netfs(void)
1863 {
1864 cifs_io_request_cachep =
1865 kmem_cache_create("cifs_io_request",
1866 sizeof(struct cifs_io_request), 0,
1867 SLAB_HWCACHE_ALIGN, NULL);
1868 if (!cifs_io_request_cachep)
1869 goto nomem_req;
1870
1871 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
1872 goto nomem_reqpool;
1873
1874 cifs_io_subrequest_cachep =
1875 kmem_cache_create("cifs_io_subrequest",
1876 sizeof(struct cifs_io_subrequest), 0,
1877 SLAB_HWCACHE_ALIGN, NULL);
1878 if (!cifs_io_subrequest_cachep)
1879 goto nomem_subreq;
1880
1881 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
1882 goto nomem_subreqpool;
1883
1884 return 0;
1885
1886 nomem_subreqpool:
1887 kmem_cache_destroy(cifs_io_subrequest_cachep);
1888 nomem_subreq:
1889 mempool_exit(&cifs_io_request_pool);
1890 nomem_reqpool:
1891 kmem_cache_destroy(cifs_io_request_cachep);
1892 nomem_req:
1893 return -ENOMEM;
1894 }
1895
cifs_destroy_netfs(void)1896 static void cifs_destroy_netfs(void)
1897 {
1898 mempool_exit(&cifs_io_subrequest_pool);
1899 kmem_cache_destroy(cifs_io_subrequest_cachep);
1900 mempool_exit(&cifs_io_request_pool);
1901 kmem_cache_destroy(cifs_io_request_cachep);
1902 }
1903
1904 static int __init
init_cifs(void)1905 init_cifs(void)
1906 {
1907 int rc = 0;
1908 cifs_proc_init();
1909 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1910 /*
1911 * Initialize Global counters
1912 */
1913 atomic_set(&sesInfoAllocCount, 0);
1914 atomic_set(&tconInfoAllocCount, 0);
1915 atomic_set(&tcpSesNextId, 0);
1916 atomic_set(&tcpSesAllocCount, 0);
1917 atomic_set(&tcpSesReconnectCount, 0);
1918 atomic_set(&tconInfoReconnectCount, 0);
1919
1920 atomic_set(&buf_alloc_count, 0);
1921 atomic_set(&small_buf_alloc_count, 0);
1922 #ifdef CONFIG_CIFS_STATS2
1923 atomic_set(&total_buf_alloc_count, 0);
1924 atomic_set(&total_small_buf_alloc_count, 0);
1925 if (slow_rsp_threshold < 1)
1926 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1927 else if (slow_rsp_threshold > 32767)
1928 cifs_dbg(VFS,
1929 "slow response threshold set higher than recommended (0 to 32767)\n");
1930 #endif /* CONFIG_CIFS_STATS2 */
1931
1932 atomic_set(&mid_count, 0);
1933 GlobalCurrentXid = 0;
1934 GlobalTotalActiveXid = 0;
1935 GlobalMaxActiveXid = 0;
1936
1937 cifs_lock_secret = get_random_u32();
1938
1939 if (cifs_max_pending < 2) {
1940 cifs_max_pending = 2;
1941 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1942 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1943 cifs_max_pending = CIFS_MAX_REQ;
1944 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1945 CIFS_MAX_REQ);
1946 }
1947
1948 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1949 if (dir_cache_timeout > 65000) {
1950 dir_cache_timeout = 65000;
1951 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1952 }
1953
1954 cifsiod_wq = alloc_workqueue("cifsiod",
1955 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1956 0);
1957 if (!cifsiod_wq) {
1958 rc = -ENOMEM;
1959 goto out_clean_proc;
1960 }
1961
1962 /*
1963 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1964 * so that we don't launch too many worker threads but
1965 * Documentation/core-api/workqueue.rst recommends setting it to 0
1966 */
1967
1968 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1969 decrypt_wq = alloc_workqueue("smb3decryptd",
1970 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1971 if (!decrypt_wq) {
1972 rc = -ENOMEM;
1973 goto out_destroy_cifsiod_wq;
1974 }
1975
1976 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1977 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1978 if (!fileinfo_put_wq) {
1979 rc = -ENOMEM;
1980 goto out_destroy_decrypt_wq;
1981 }
1982
1983 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1984 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1985 0);
1986 if (!cifsoplockd_wq) {
1987 rc = -ENOMEM;
1988 goto out_destroy_fileinfo_put_wq;
1989 }
1990
1991 deferredclose_wq = alloc_workqueue("deferredclose",
1992 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
1993 0);
1994 if (!deferredclose_wq) {
1995 rc = -ENOMEM;
1996 goto out_destroy_cifsoplockd_wq;
1997 }
1998
1999 serverclose_wq = alloc_workqueue("serverclose",
2000 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2001 0);
2002 if (!serverclose_wq) {
2003 rc = -ENOMEM;
2004 goto out_destroy_deferredclose_wq;
2005 }
2006
2007 cfid_put_wq = alloc_workqueue("cfid_put_wq",
2008 WQ_FREEZABLE | WQ_MEM_RECLAIM | WQ_PERCPU,
2009 0);
2010 if (!cfid_put_wq) {
2011 rc = -ENOMEM;
2012 goto out_destroy_serverclose_wq;
2013 }
2014
2015 rc = cifs_init_inodecache();
2016 if (rc)
2017 goto out_destroy_cfid_put_wq;
2018
2019 rc = cifs_init_netfs();
2020 if (rc)
2021 goto out_destroy_inodecache;
2022
2023 rc = init_mids();
2024 if (rc)
2025 goto out_destroy_netfs;
2026
2027 rc = cifs_init_request_bufs();
2028 if (rc)
2029 goto out_destroy_mids;
2030
2031 #ifdef CONFIG_CIFS_DFS_UPCALL
2032 rc = dfs_cache_init();
2033 if (rc)
2034 goto out_destroy_request_bufs;
2035 #endif /* CONFIG_CIFS_DFS_UPCALL */
2036 #ifdef CONFIG_CIFS_UPCALL
2037 rc = init_cifs_spnego();
2038 if (rc)
2039 goto out_destroy_dfs_cache;
2040 #endif /* CONFIG_CIFS_UPCALL */
2041 #ifdef CONFIG_CIFS_SWN_UPCALL
2042 rc = cifs_genl_init();
2043 if (rc)
2044 goto out_register_key_type;
2045 #endif /* CONFIG_CIFS_SWN_UPCALL */
2046
2047 rc = init_cifs_idmap();
2048 if (rc)
2049 goto out_cifs_swn_init;
2050
2051 rc = register_filesystem(&cifs_fs_type);
2052 if (rc)
2053 goto out_init_cifs_idmap;
2054
2055 rc = register_filesystem(&smb3_fs_type);
2056 if (rc) {
2057 unregister_filesystem(&cifs_fs_type);
2058 goto out_init_cifs_idmap;
2059 }
2060
2061 return 0;
2062
2063 out_init_cifs_idmap:
2064 exit_cifs_idmap();
2065 out_cifs_swn_init:
2066 #ifdef CONFIG_CIFS_SWN_UPCALL
2067 cifs_genl_exit();
2068 out_register_key_type:
2069 #endif
2070 #ifdef CONFIG_CIFS_UPCALL
2071 exit_cifs_spnego();
2072 out_destroy_dfs_cache:
2073 #endif
2074 #ifdef CONFIG_CIFS_DFS_UPCALL
2075 dfs_cache_destroy();
2076 out_destroy_request_bufs:
2077 #endif
2078 cifs_destroy_request_bufs();
2079 out_destroy_mids:
2080 destroy_mids();
2081 out_destroy_netfs:
2082 cifs_destroy_netfs();
2083 out_destroy_inodecache:
2084 cifs_destroy_inodecache();
2085 out_destroy_cfid_put_wq:
2086 destroy_workqueue(cfid_put_wq);
2087 out_destroy_serverclose_wq:
2088 destroy_workqueue(serverclose_wq);
2089 out_destroy_deferredclose_wq:
2090 destroy_workqueue(deferredclose_wq);
2091 out_destroy_cifsoplockd_wq:
2092 destroy_workqueue(cifsoplockd_wq);
2093 out_destroy_fileinfo_put_wq:
2094 destroy_workqueue(fileinfo_put_wq);
2095 out_destroy_decrypt_wq:
2096 destroy_workqueue(decrypt_wq);
2097 out_destroy_cifsiod_wq:
2098 destroy_workqueue(cifsiod_wq);
2099 out_clean_proc:
2100 cifs_proc_clean();
2101 return rc;
2102 }
2103
2104 static void __exit
exit_cifs(void)2105 exit_cifs(void)
2106 {
2107 cifs_dbg(NOISY, "exit_smb3\n");
2108 unregister_filesystem(&cifs_fs_type);
2109 unregister_filesystem(&smb3_fs_type);
2110 cifs_release_automount_timer();
2111 exit_cifs_idmap();
2112 #ifdef CONFIG_CIFS_SWN_UPCALL
2113 cifs_genl_exit();
2114 #endif
2115 #ifdef CONFIG_CIFS_UPCALL
2116 exit_cifs_spnego();
2117 #endif
2118 #ifdef CONFIG_CIFS_DFS_UPCALL
2119 dfs_cache_destroy();
2120 #endif
2121 cifs_destroy_request_bufs();
2122 destroy_mids();
2123 cifs_destroy_netfs();
2124 cifs_destroy_inodecache();
2125 destroy_workqueue(deferredclose_wq);
2126 destroy_workqueue(cifsoplockd_wq);
2127 destroy_workqueue(decrypt_wq);
2128 destroy_workqueue(fileinfo_put_wq);
2129 destroy_workqueue(serverclose_wq);
2130 destroy_workqueue(cfid_put_wq);
2131 destroy_workqueue(cifsiod_wq);
2132 cifs_proc_clean();
2133 }
2134
2135 MODULE_AUTHOR("Steve French");
2136 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2137 MODULE_DESCRIPTION
2138 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2139 "also older servers complying with the SNIA CIFS Specification)");
2140 MODULE_VERSION(CIFS_VERSION);
2141 MODULE_SOFTDEP("ecb");
2142 MODULE_SOFTDEP("nls");
2143 MODULE_SOFTDEP("aes");
2144 MODULE_SOFTDEP("cmac");
2145 MODULE_SOFTDEP("aead2");
2146 MODULE_SOFTDEP("ccm");
2147 MODULE_SOFTDEP("gcm");
2148 module_init(init_cifs)
2149 module_exit(exit_cifs)
2150