1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 */
10
11 /* Note that BB means BUGBUG (ie something to fix eventually) */
12
13 #include <linux/module.h>
14 #include <linux/fs.h>
15 #include <linux/filelock.h>
16 #include <linux/mount.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/list.h>
20 #include <linux/seq_file.h>
21 #include <linux/vfs.h>
22 #include <linux/mempool.h>
23 #include <linux/delay.h>
24 #include <linux/kthread.h>
25 #include <linux/freezer.h>
26 #include <linux/namei.h>
27 #include <linux/random.h>
28 #include <linux/splice.h>
29 #include <linux/uuid.h>
30 #include <linux/xattr.h>
31 #include <uapi/linux/magic.h>
32 #include <net/ipv6.h>
33 #include "cifsfs.h"
34 #include "cifspdu.h"
35 #define DECLARE_GLOBALS_HERE
36 #include "cifsglob.h"
37 #include "cifsproto.h"
38 #include "cifs_debug.h"
39 #include "cifs_fs_sb.h"
40 #include <linux/mm.h>
41 #include <linux/key-type.h>
42 #include "cifs_spnego.h"
43 #include "fscache.h"
44 #ifdef CONFIG_CIFS_DFS_UPCALL
45 #include "dfs_cache.h"
46 #endif
47 #ifdef CONFIG_CIFS_SWN_UPCALL
48 #include "netlink.h"
49 #endif
50 #include "fs_context.h"
51 #include "cached_dir.h"
52
53 /*
54 * DOS dates from 1980/1/1 through 2107/12/31
55 * Protocol specifications indicate the range should be to 119, which
56 * limits maximum year to 2099. But this range has not been checked.
57 */
58 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
59 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
60 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
61
62 int cifsFYI = 0;
63 bool traceSMB;
64 bool enable_oplocks = true;
65 bool linuxExtEnabled = true;
66 bool lookupCacheEnabled = true;
67 bool disable_legacy_dialects; /* false by default */
68 bool enable_gcm_256 = true;
69 bool require_gcm_256; /* false by default */
70 bool enable_negotiate_signing; /* false by default */
71 unsigned int global_secflags = CIFSSEC_DEF;
72 /* unsigned int ntlmv2_support = 0; */
73 unsigned int sign_CIFS_PDUs = 1;
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 spinlock_t 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 spinlock_t 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 #ifdef CONFIG_CIFS_STATS2
126 unsigned int slow_rsp_threshold = 1;
127 module_param(slow_rsp_threshold, uint, 0644);
128 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
129 "before logging that a response is delayed. "
130 "Default: 1 (if set to 0 disables msg).");
131 #endif /* STATS2 */
132
133 module_param(enable_oplocks, bool, 0644);
134 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
135
136 module_param(enable_gcm_256, bool, 0644);
137 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: y/Y/0");
138
139 module_param(require_gcm_256, bool, 0644);
140 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
141
142 module_param(enable_negotiate_signing, bool, 0644);
143 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
144
145 module_param(disable_legacy_dialects, bool, 0644);
146 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
147 "helpful to restrict the ability to "
148 "override the default dialects (SMB2.1, "
149 "SMB3 and SMB3.02) on mount with old "
150 "dialects (CIFS/SMB1 and SMB2) since "
151 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
152 " and less secure. Default: n/N/0");
153
154 struct workqueue_struct *cifsiod_wq;
155 struct workqueue_struct *decrypt_wq;
156 struct workqueue_struct *fileinfo_put_wq;
157 struct workqueue_struct *cifsoplockd_wq;
158 struct workqueue_struct *deferredclose_wq;
159 struct workqueue_struct *serverclose_wq;
160 __u32 cifs_lock_secret;
161
162 /*
163 * Bumps refcount for cifs super block.
164 * Note that it should be only called if a referece to VFS super block is
165 * already held, e.g. in open-type syscalls context. Otherwise it can race with
166 * atomic_dec_and_test in deactivate_locked_super.
167 */
168 void
cifs_sb_active(struct super_block * sb)169 cifs_sb_active(struct super_block *sb)
170 {
171 struct cifs_sb_info *server = CIFS_SB(sb);
172
173 if (atomic_inc_return(&server->active) == 1)
174 atomic_inc(&sb->s_active);
175 }
176
177 void
cifs_sb_deactive(struct super_block * sb)178 cifs_sb_deactive(struct super_block *sb)
179 {
180 struct cifs_sb_info *server = CIFS_SB(sb);
181
182 if (atomic_dec_and_test(&server->active))
183 deactivate_super(sb);
184 }
185
186 static int
cifs_read_super(struct super_block * sb)187 cifs_read_super(struct super_block *sb)
188 {
189 struct inode *inode;
190 struct cifs_sb_info *cifs_sb;
191 struct cifs_tcon *tcon;
192 struct timespec64 ts;
193 int rc = 0;
194
195 cifs_sb = CIFS_SB(sb);
196 tcon = cifs_sb_master_tcon(cifs_sb);
197
198 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
199 sb->s_flags |= SB_POSIXACL;
200
201 if (tcon->snapshot_time)
202 sb->s_flags |= SB_RDONLY;
203
204 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
205 sb->s_maxbytes = MAX_LFS_FILESIZE;
206 else
207 sb->s_maxbytes = MAX_NON_LFS;
208
209 /*
210 * Some very old servers like DOS and OS/2 used 2 second granularity
211 * (while all current servers use 100ns granularity - see MS-DTYP)
212 * but 1 second is the maximum allowed granularity for the VFS
213 * so for old servers set time granularity to 1 second while for
214 * everything else (current servers) set it to 100ns.
215 */
216 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
217 ((tcon->ses->capabilities &
218 tcon->ses->server->vals->cap_nt_find) == 0) &&
219 !tcon->unix_ext) {
220 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
221 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
222 sb->s_time_min = ts.tv_sec;
223 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
224 cpu_to_le16(SMB_TIME_MAX), 0);
225 sb->s_time_max = ts.tv_sec;
226 } else {
227 /*
228 * Almost every server, including all SMB2+, uses DCE TIME
229 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
230 */
231 sb->s_time_gran = 100;
232 ts = cifs_NTtimeToUnix(0);
233 sb->s_time_min = ts.tv_sec;
234 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
235 sb->s_time_max = ts.tv_sec;
236 }
237
238 sb->s_magic = CIFS_SUPER_MAGIC;
239 sb->s_op = &cifs_super_ops;
240 sb->s_xattr = cifs_xattr_handlers;
241 rc = super_setup_bdi(sb);
242 if (rc)
243 goto out_no_root;
244 /* tune readahead according to rsize if readahead size not set on mount */
245 if (cifs_sb->ctx->rsize == 0)
246 cifs_sb->ctx->rsize =
247 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
248 if (cifs_sb->ctx->rasize)
249 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
250 else
251 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
252
253 sb->s_blocksize = CIFS_MAX_MSGSIZE;
254 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
255 inode = cifs_root_iget(sb);
256
257 if (IS_ERR(inode)) {
258 rc = PTR_ERR(inode);
259 goto out_no_root;
260 }
261
262 if (tcon->nocase)
263 sb->s_d_op = &cifs_ci_dentry_ops;
264 else
265 sb->s_d_op = &cifs_dentry_ops;
266
267 sb->s_root = d_make_root(inode);
268 if (!sb->s_root) {
269 rc = -ENOMEM;
270 goto out_no_root;
271 }
272
273 #ifdef CONFIG_CIFS_NFSD_EXPORT
274 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
275 cifs_dbg(FYI, "export ops supported\n");
276 sb->s_export_op = &cifs_export_ops;
277 }
278 #endif /* CONFIG_CIFS_NFSD_EXPORT */
279
280 return 0;
281
282 out_no_root:
283 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
284 return rc;
285 }
286
cifs_kill_sb(struct super_block * sb)287 static void cifs_kill_sb(struct super_block *sb)
288 {
289 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
290
291 /*
292 * We ned to release all dentries for the cached directories
293 * before we kill the sb.
294 */
295 if (cifs_sb->root) {
296 close_all_cached_dirs(cifs_sb);
297
298 /* finally release root dentry */
299 dput(cifs_sb->root);
300 cifs_sb->root = NULL;
301 }
302
303 kill_anon_super(sb);
304 cifs_umount(cifs_sb);
305 }
306
307 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)308 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
309 {
310 struct super_block *sb = dentry->d_sb;
311 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
312 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
313 struct TCP_Server_Info *server = tcon->ses->server;
314 unsigned int xid;
315 int rc = 0;
316
317 xid = get_xid();
318
319 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
320 buf->f_namelen =
321 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
322 else
323 buf->f_namelen = PATH_MAX;
324
325 buf->f_fsid.val[0] = tcon->vol_serial_number;
326 /* are using part of create time for more randomness, see man statfs */
327 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
328
329 buf->f_files = 0; /* undefined */
330 buf->f_ffree = 0; /* unlimited */
331
332 if (server->ops->queryfs)
333 rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
334
335 free_xid(xid);
336 return rc;
337 }
338
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)339 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
340 {
341 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
342 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
343 struct TCP_Server_Info *server = tcon->ses->server;
344
345 if (server->ops->fallocate)
346 return server->ops->fallocate(file, tcon, mode, off, len);
347
348 return -EOPNOTSUPP;
349 }
350
cifs_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)351 static int cifs_permission(struct mnt_idmap *idmap,
352 struct inode *inode, int mask)
353 {
354 struct cifs_sb_info *cifs_sb;
355
356 cifs_sb = CIFS_SB(inode->i_sb);
357
358 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
359 if ((mask & MAY_EXEC) && !execute_ok(inode))
360 return -EACCES;
361 else
362 return 0;
363 } else /* file mode might have been restricted at mount time
364 on the client (above and beyond ACL on servers) for
365 servers which do not support setting and viewing mode bits,
366 so allowing client to check permissions is useful */
367 return generic_permission(&nop_mnt_idmap, inode, mask);
368 }
369
370 static struct kmem_cache *cifs_inode_cachep;
371 static struct kmem_cache *cifs_req_cachep;
372 static struct kmem_cache *cifs_mid_cachep;
373 static struct kmem_cache *cifs_sm_req_cachep;
374 static struct kmem_cache *cifs_io_request_cachep;
375 static struct kmem_cache *cifs_io_subrequest_cachep;
376 mempool_t *cifs_sm_req_poolp;
377 mempool_t *cifs_req_poolp;
378 mempool_t *cifs_mid_poolp;
379 mempool_t cifs_io_request_pool;
380 mempool_t cifs_io_subrequest_pool;
381
382 static struct inode *
cifs_alloc_inode(struct super_block * sb)383 cifs_alloc_inode(struct super_block *sb)
384 {
385 struct cifsInodeInfo *cifs_inode;
386 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
387 if (!cifs_inode)
388 return NULL;
389 cifs_inode->cifsAttrs = 0x20; /* default */
390 cifs_inode->time = 0;
391 /*
392 * Until the file is open and we have gotten oplock info back from the
393 * server, can not assume caching of file data or metadata.
394 */
395 cifs_set_oplock_level(cifs_inode, 0);
396 cifs_inode->lease_granted = false;
397 cifs_inode->flags = 0;
398 spin_lock_init(&cifs_inode->writers_lock);
399 cifs_inode->writers = 0;
400 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
401 cifs_inode->netfs.remote_i_size = 0;
402 cifs_inode->uniqueid = 0;
403 cifs_inode->createtime = 0;
404 cifs_inode->epoch = 0;
405 spin_lock_init(&cifs_inode->open_file_lock);
406 generate_random_uuid(cifs_inode->lease_key);
407 cifs_inode->symlink_target = NULL;
408
409 /*
410 * Can not set i_flags here - they get immediately overwritten to zero
411 * by the VFS.
412 */
413 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
414 INIT_LIST_HEAD(&cifs_inode->openFileList);
415 INIT_LIST_HEAD(&cifs_inode->llist);
416 INIT_LIST_HEAD(&cifs_inode->deferred_closes);
417 spin_lock_init(&cifs_inode->deferred_lock);
418 return &cifs_inode->netfs.inode;
419 }
420
421 static void
cifs_free_inode(struct inode * inode)422 cifs_free_inode(struct inode *inode)
423 {
424 struct cifsInodeInfo *cinode = CIFS_I(inode);
425
426 if (S_ISLNK(inode->i_mode))
427 kfree(cinode->symlink_target);
428 kmem_cache_free(cifs_inode_cachep, cinode);
429 }
430
431 static void
cifs_evict_inode(struct inode * inode)432 cifs_evict_inode(struct inode *inode)
433 {
434 netfs_wait_for_outstanding_io(inode);
435 truncate_inode_pages_final(&inode->i_data);
436 if (inode->i_state & I_PINNING_NETFS_WB)
437 cifs_fscache_unuse_inode_cookie(inode, true);
438 cifs_fscache_release_inode_cookie(inode);
439 clear_inode(inode);
440 }
441
442 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)443 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
444 {
445 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
446 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
447
448 seq_puts(s, ",addr=");
449
450 switch (server->dstaddr.ss_family) {
451 case AF_INET:
452 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
453 break;
454 case AF_INET6:
455 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
456 if (sa6->sin6_scope_id)
457 seq_printf(s, "%%%u", sa6->sin6_scope_id);
458 break;
459 default:
460 seq_puts(s, "(unknown)");
461 }
462 if (server->rdma)
463 seq_puts(s, ",rdma");
464 }
465
466 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)467 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
468 {
469 if (ses->sectype == Unspecified) {
470 if (ses->user_name == NULL)
471 seq_puts(s, ",sec=none");
472 return;
473 }
474
475 seq_puts(s, ",sec=");
476
477 switch (ses->sectype) {
478 case NTLMv2:
479 seq_puts(s, "ntlmv2");
480 break;
481 case Kerberos:
482 seq_puts(s, "krb5");
483 break;
484 case RawNTLMSSP:
485 seq_puts(s, "ntlmssp");
486 break;
487 default:
488 /* shouldn't ever happen */
489 seq_puts(s, "unknown");
490 break;
491 }
492
493 if (ses->sign)
494 seq_puts(s, "i");
495
496 if (ses->sectype == Kerberos)
497 seq_printf(s, ",cruid=%u",
498 from_kuid_munged(&init_user_ns, ses->cred_uid));
499 }
500
501 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)502 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
503 {
504 seq_puts(s, ",cache=");
505
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
507 seq_puts(s, "strict");
508 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
509 seq_puts(s, "none");
510 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
511 seq_puts(s, "singleclient"); /* assume only one client access */
512 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
513 seq_puts(s, "ro"); /* read only caching assumed */
514 else
515 seq_puts(s, "loose");
516 }
517
518 /*
519 * cifs_show_devname() is used so we show the mount device name with correct
520 * format (e.g. forward slashes vs. back slashes) in /proc/mounts
521 */
cifs_show_devname(struct seq_file * m,struct dentry * root)522 static int cifs_show_devname(struct seq_file *m, struct dentry *root)
523 {
524 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
525 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
526
527 if (devname == NULL)
528 seq_puts(m, "none");
529 else {
530 convert_delimiter(devname, '/');
531 /* escape all spaces in share names */
532 seq_escape(m, devname, " \t");
533 kfree(devname);
534 }
535 return 0;
536 }
537
538 /*
539 * cifs_show_options() is for displaying mount options in /proc/mounts.
540 * Not all settable options are displayed but most of the important
541 * ones are.
542 */
543 static int
cifs_show_options(struct seq_file * s,struct dentry * root)544 cifs_show_options(struct seq_file *s, struct dentry *root)
545 {
546 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
547 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
548 struct sockaddr *srcaddr;
549 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
550
551 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
552 cifs_show_security(s, tcon->ses);
553 cifs_show_cache_flavor(s, cifs_sb);
554
555 if (tcon->no_lease)
556 seq_puts(s, ",nolease");
557 if (cifs_sb->ctx->multiuser)
558 seq_puts(s, ",multiuser");
559 else if (tcon->ses->user_name)
560 seq_show_option(s, "username", tcon->ses->user_name);
561
562 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
563 seq_show_option(s, "domain", tcon->ses->domainName);
564
565 if (srcaddr->sa_family != AF_UNSPEC) {
566 struct sockaddr_in *saddr4;
567 struct sockaddr_in6 *saddr6;
568 saddr4 = (struct sockaddr_in *)srcaddr;
569 saddr6 = (struct sockaddr_in6 *)srcaddr;
570 if (srcaddr->sa_family == AF_INET6)
571 seq_printf(s, ",srcaddr=%pI6c",
572 &saddr6->sin6_addr);
573 else if (srcaddr->sa_family == AF_INET)
574 seq_printf(s, ",srcaddr=%pI4",
575 &saddr4->sin_addr.s_addr);
576 else
577 seq_printf(s, ",srcaddr=BAD-AF:%i",
578 (int)(srcaddr->sa_family));
579 }
580
581 seq_printf(s, ",uid=%u",
582 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
583 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
584 seq_puts(s, ",forceuid");
585 else
586 seq_puts(s, ",noforceuid");
587
588 seq_printf(s, ",gid=%u",
589 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
590 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
591 seq_puts(s, ",forcegid");
592 else
593 seq_puts(s, ",noforcegid");
594
595 cifs_show_address(s, tcon->ses->server);
596
597 if (!tcon->unix_ext)
598 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
599 cifs_sb->ctx->file_mode,
600 cifs_sb->ctx->dir_mode);
601 if (cifs_sb->ctx->iocharset)
602 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
603 if (tcon->seal)
604 seq_puts(s, ",seal");
605 else if (tcon->ses->server->ignore_signature)
606 seq_puts(s, ",signloosely");
607 if (tcon->nocase)
608 seq_puts(s, ",nocase");
609 if (tcon->nodelete)
610 seq_puts(s, ",nodelete");
611 if (cifs_sb->ctx->no_sparse)
612 seq_puts(s, ",nosparse");
613 if (tcon->local_lease)
614 seq_puts(s, ",locallease");
615 if (tcon->retry)
616 seq_puts(s, ",hard");
617 else
618 seq_puts(s, ",soft");
619 if (tcon->use_persistent)
620 seq_puts(s, ",persistenthandles");
621 else if (tcon->use_resilient)
622 seq_puts(s, ",resilienthandles");
623 if (tcon->posix_extensions)
624 seq_puts(s, ",posix");
625 else if (tcon->unix_ext)
626 seq_puts(s, ",unix");
627 else
628 seq_puts(s, ",nounix");
629 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
630 seq_puts(s, ",nodfs");
631 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
632 seq_puts(s, ",posixpaths");
633 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
634 seq_puts(s, ",setuids");
635 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
636 seq_puts(s, ",idsfromsid");
637 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
638 seq_puts(s, ",serverino");
639 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
640 seq_puts(s, ",rwpidforward");
641 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
642 seq_puts(s, ",forcemand");
643 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
644 seq_puts(s, ",nouser_xattr");
645 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
646 seq_puts(s, ",mapchars");
647 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
648 seq_puts(s, ",mapposix");
649 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
650 seq_puts(s, ",sfu");
651 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
652 seq_puts(s, ",nobrl");
653 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
654 seq_puts(s, ",nohandlecache");
655 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
656 seq_puts(s, ",modefromsid");
657 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
658 seq_puts(s, ",cifsacl");
659 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
660 seq_puts(s, ",dynperm");
661 if (root->d_sb->s_flags & SB_POSIXACL)
662 seq_puts(s, ",acl");
663 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
664 seq_puts(s, ",mfsymlinks");
665 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
666 seq_puts(s, ",fsc");
667 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
668 seq_puts(s, ",nostrictsync");
669 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
670 seq_puts(s, ",noperm");
671 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
672 seq_printf(s, ",backupuid=%u",
673 from_kuid_munged(&init_user_ns,
674 cifs_sb->ctx->backupuid));
675 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
676 seq_printf(s, ",backupgid=%u",
677 from_kgid_munged(&init_user_ns,
678 cifs_sb->ctx->backupgid));
679 seq_show_option(s, "reparse",
680 cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
681
682 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
683 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
684 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
685 if (cifs_sb->ctx->rasize)
686 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
687 if (tcon->ses->server->min_offload)
688 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
689 if (tcon->ses->server->retrans)
690 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans);
691 seq_printf(s, ",echo_interval=%lu",
692 tcon->ses->server->echo_interval / HZ);
693
694 /* Only display the following if overridden on mount */
695 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
696 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
697 if (tcon->ses->server->tcp_nodelay)
698 seq_puts(s, ",tcpnodelay");
699 if (tcon->ses->server->noautotune)
700 seq_puts(s, ",noautotune");
701 if (tcon->ses->server->noblocksnd)
702 seq_puts(s, ",noblocksend");
703 if (tcon->ses->server->nosharesock)
704 seq_puts(s, ",nosharesock");
705
706 if (tcon->snapshot_time)
707 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
708 if (tcon->handle_timeout)
709 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
710 if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
711 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
712
713 /*
714 * Display file and directory attribute timeout in seconds.
715 * If file and directory attribute timeout the same then actimeo
716 * was likely specified on mount
717 */
718 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
719 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
720 else {
721 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
722 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
723 }
724 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
725
726 if (tcon->ses->chan_max > 1)
727 seq_printf(s, ",multichannel,max_channels=%zu",
728 tcon->ses->chan_max);
729
730 if (tcon->use_witness)
731 seq_puts(s, ",witness");
732
733 return 0;
734 }
735
cifs_umount_begin(struct super_block * sb)736 static void cifs_umount_begin(struct super_block *sb)
737 {
738 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
739 struct cifs_tcon *tcon;
740
741 if (cifs_sb == NULL)
742 return;
743
744 tcon = cifs_sb_master_tcon(cifs_sb);
745
746 spin_lock(&cifs_tcp_ses_lock);
747 spin_lock(&tcon->tc_lock);
748 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
749 netfs_trace_tcon_ref_see_umount);
750 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
751 /* we have other mounts to same share or we have
752 already tried to umount this and woken up
753 all waiting network requests, nothing to do */
754 spin_unlock(&tcon->tc_lock);
755 spin_unlock(&cifs_tcp_ses_lock);
756 return;
757 }
758 /*
759 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
760 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
761 */
762 spin_unlock(&tcon->tc_lock);
763 spin_unlock(&cifs_tcp_ses_lock);
764
765 cifs_close_all_deferred_files(tcon);
766 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
767 /* cancel_notify_requests(tcon); */
768 if (tcon->ses && tcon->ses->server) {
769 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
770 wake_up_all(&tcon->ses->server->request_q);
771 wake_up_all(&tcon->ses->server->response_q);
772 msleep(1); /* yield */
773 /* we have to kick the requests once more */
774 wake_up_all(&tcon->ses->server->response_q);
775 msleep(1);
776 }
777
778 return;
779 }
780
cifs_freeze(struct super_block * sb)781 static int cifs_freeze(struct super_block *sb)
782 {
783 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
784 struct cifs_tcon *tcon;
785
786 if (cifs_sb == NULL)
787 return 0;
788
789 tcon = cifs_sb_master_tcon(cifs_sb);
790
791 cifs_close_all_deferred_files(tcon);
792 return 0;
793 }
794
795 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)796 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
797 {
798 /* BB FIXME */
799 return 0;
800 }
801 #endif
802
cifs_write_inode(struct inode * inode,struct writeback_control * wbc)803 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
804 {
805 return netfs_unpin_writeback(inode, wbc);
806 }
807
cifs_drop_inode(struct inode * inode)808 static int cifs_drop_inode(struct inode *inode)
809 {
810 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
811
812 /* no serverino => unconditional eviction */
813 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
814 generic_drop_inode(inode);
815 }
816
817 static const struct super_operations cifs_super_ops = {
818 .statfs = cifs_statfs,
819 .alloc_inode = cifs_alloc_inode,
820 .write_inode = cifs_write_inode,
821 .free_inode = cifs_free_inode,
822 .drop_inode = cifs_drop_inode,
823 .evict_inode = cifs_evict_inode,
824 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */
825 .show_devname = cifs_show_devname,
826 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
827 function unless later we add lazy close of inodes or unless the
828 kernel forgets to call us with the same number of releases (closes)
829 as opens */
830 .show_options = cifs_show_options,
831 .umount_begin = cifs_umount_begin,
832 .freeze_fs = cifs_freeze,
833 #ifdef CONFIG_CIFS_STATS2
834 .show_stats = cifs_show_stats,
835 #endif
836 };
837
838 /*
839 * Get root dentry from superblock according to prefix path mount option.
840 * Return dentry with refcount + 1 on success and NULL otherwise.
841 */
842 static struct dentry *
cifs_get_root(struct smb3_fs_context * ctx,struct super_block * sb)843 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
844 {
845 struct dentry *dentry;
846 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
847 char *full_path = NULL;
848 char *s, *p;
849 char sep;
850
851 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
852 return dget(sb->s_root);
853
854 full_path = cifs_build_path_to_root(ctx, cifs_sb,
855 cifs_sb_master_tcon(cifs_sb), 0);
856 if (full_path == NULL)
857 return ERR_PTR(-ENOMEM);
858
859 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
860
861 sep = CIFS_DIR_SEP(cifs_sb);
862 dentry = dget(sb->s_root);
863 s = full_path;
864
865 do {
866 struct inode *dir = d_inode(dentry);
867 struct dentry *child;
868
869 if (!S_ISDIR(dir->i_mode)) {
870 dput(dentry);
871 dentry = ERR_PTR(-ENOTDIR);
872 break;
873 }
874
875 /* skip separators */
876 while (*s == sep)
877 s++;
878 if (!*s)
879 break;
880 p = s++;
881 /* next separator */
882 while (*s && *s != sep)
883 s++;
884
885 child = lookup_positive_unlocked(p, dentry, s - p);
886 dput(dentry);
887 dentry = child;
888 } while (!IS_ERR(dentry));
889 kfree(full_path);
890 return dentry;
891 }
892
cifs_set_super(struct super_block * sb,void * data)893 static int cifs_set_super(struct super_block *sb, void *data)
894 {
895 struct cifs_mnt_data *mnt_data = data;
896 sb->s_fs_info = mnt_data->cifs_sb;
897 return set_anon_super(sb, NULL);
898 }
899
900 struct dentry *
cifs_smb3_do_mount(struct file_system_type * fs_type,int flags,struct smb3_fs_context * old_ctx)901 cifs_smb3_do_mount(struct file_system_type *fs_type,
902 int flags, struct smb3_fs_context *old_ctx)
903 {
904 struct cifs_mnt_data mnt_data;
905 struct cifs_sb_info *cifs_sb;
906 struct super_block *sb;
907 struct dentry *root;
908 int rc;
909
910 if (cifsFYI) {
911 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
912 old_ctx->source, flags);
913 } else {
914 cifs_info("Attempting to mount %s\n", old_ctx->source);
915 }
916
917 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL);
918 if (!cifs_sb)
919 return ERR_PTR(-ENOMEM);
920
921 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
922 if (!cifs_sb->ctx) {
923 root = ERR_PTR(-ENOMEM);
924 goto out;
925 }
926 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
927 if (rc) {
928 root = ERR_PTR(rc);
929 goto out;
930 }
931
932 rc = cifs_setup_cifs_sb(cifs_sb);
933 if (rc) {
934 root = ERR_PTR(rc);
935 goto out;
936 }
937
938 rc = cifs_mount(cifs_sb, cifs_sb->ctx);
939 if (rc) {
940 if (!(flags & SB_SILENT))
941 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
942 rc);
943 root = ERR_PTR(rc);
944 goto out;
945 }
946
947 mnt_data.ctx = cifs_sb->ctx;
948 mnt_data.cifs_sb = cifs_sb;
949 mnt_data.flags = flags;
950
951 /* BB should we make this contingent on mount parm? */
952 flags |= SB_NODIRATIME | SB_NOATIME;
953
954 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
955 if (IS_ERR(sb)) {
956 cifs_umount(cifs_sb);
957 return ERR_CAST(sb);
958 }
959
960 if (sb->s_root) {
961 cifs_dbg(FYI, "Use existing superblock\n");
962 cifs_umount(cifs_sb);
963 cifs_sb = NULL;
964 } else {
965 rc = cifs_read_super(sb);
966 if (rc) {
967 root = ERR_PTR(rc);
968 goto out_super;
969 }
970
971 sb->s_flags |= SB_ACTIVE;
972 }
973
974 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
975 if (IS_ERR(root))
976 goto out_super;
977
978 if (cifs_sb)
979 cifs_sb->root = dget(root);
980
981 cifs_dbg(FYI, "dentry root is: %p\n", root);
982 return root;
983
984 out_super:
985 deactivate_locked_super(sb);
986 return root;
987 out:
988 kfree(cifs_sb->prepath);
989 smb3_cleanup_fs_context(cifs_sb->ctx);
990 kfree(cifs_sb);
991 return root;
992 }
993
cifs_llseek(struct file * file,loff_t offset,int whence)994 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
995 {
996 struct cifsFileInfo *cfile = file->private_data;
997 struct cifs_tcon *tcon;
998
999 /*
1000 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
1001 * the cached file length
1002 */
1003 if (whence != SEEK_SET && whence != SEEK_CUR) {
1004 int rc;
1005 struct inode *inode = file_inode(file);
1006
1007 /*
1008 * We need to be sure that all dirty pages are written and the
1009 * server has the newest file length.
1010 */
1011 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
1012 inode->i_mapping->nrpages != 0) {
1013 rc = filemap_fdatawait(inode->i_mapping);
1014 if (rc) {
1015 mapping_set_error(inode->i_mapping, rc);
1016 return rc;
1017 }
1018 }
1019 /*
1020 * Some applications poll for the file length in this strange
1021 * way so we must seek to end on non-oplocked files by
1022 * setting the revalidate time to zero.
1023 */
1024 CIFS_I(inode)->time = 0;
1025
1026 rc = cifs_revalidate_file_attr(file);
1027 if (rc < 0)
1028 return (loff_t)rc;
1029 }
1030 if (cfile && cfile->tlink) {
1031 tcon = tlink_tcon(cfile->tlink);
1032 if (tcon->ses->server->ops->llseek)
1033 return tcon->ses->server->ops->llseek(file, tcon,
1034 offset, whence);
1035 }
1036 return generic_file_llseek(file, offset, whence);
1037 }
1038
1039 static int
cifs_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)1040 cifs_setlease(struct file *file, int arg, struct file_lease **lease, void **priv)
1041 {
1042 /*
1043 * Note that this is called by vfs setlease with i_lock held to
1044 * protect *lease from going away.
1045 */
1046 struct inode *inode = file_inode(file);
1047 struct cifsFileInfo *cfile = file->private_data;
1048
1049 /* Check if file is oplocked if this is request for new lease */
1050 if (arg == F_UNLCK ||
1051 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
1052 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
1053 return generic_setlease(file, arg, lease, priv);
1054 else if (tlink_tcon(cfile->tlink)->local_lease &&
1055 !CIFS_CACHE_READ(CIFS_I(inode)))
1056 /*
1057 * If the server claims to support oplock on this file, then we
1058 * still need to check oplock even if the local_lease mount
1059 * option is set, but there are servers which do not support
1060 * oplock for which this mount option may be useful if the user
1061 * knows that the file won't be changed on the server by anyone
1062 * else.
1063 */
1064 return generic_setlease(file, arg, lease, priv);
1065 else
1066 return -EAGAIN;
1067 }
1068
1069 struct file_system_type cifs_fs_type = {
1070 .owner = THIS_MODULE,
1071 .name = "cifs",
1072 .init_fs_context = smb3_init_fs_context,
1073 .parameters = smb3_fs_parameters,
1074 .kill_sb = cifs_kill_sb,
1075 .fs_flags = FS_RENAME_DOES_D_MOVE,
1076 };
1077 MODULE_ALIAS_FS("cifs");
1078
1079 struct file_system_type smb3_fs_type = {
1080 .owner = THIS_MODULE,
1081 .name = "smb3",
1082 .init_fs_context = smb3_init_fs_context,
1083 .parameters = smb3_fs_parameters,
1084 .kill_sb = cifs_kill_sb,
1085 .fs_flags = FS_RENAME_DOES_D_MOVE,
1086 };
1087 MODULE_ALIAS_FS("smb3");
1088 MODULE_ALIAS("smb3");
1089
1090 const struct inode_operations cifs_dir_inode_ops = {
1091 .create = cifs_create,
1092 .atomic_open = cifs_atomic_open,
1093 .lookup = cifs_lookup,
1094 .getattr = cifs_getattr,
1095 .unlink = cifs_unlink,
1096 .link = cifs_hardlink,
1097 .mkdir = cifs_mkdir,
1098 .rmdir = cifs_rmdir,
1099 .rename = cifs_rename2,
1100 .permission = cifs_permission,
1101 .setattr = cifs_setattr,
1102 .symlink = cifs_symlink,
1103 .mknod = cifs_mknod,
1104 .listxattr = cifs_listxattr,
1105 .get_acl = cifs_get_acl,
1106 .set_acl = cifs_set_acl,
1107 };
1108
1109 const struct inode_operations cifs_file_inode_ops = {
1110 .setattr = cifs_setattr,
1111 .getattr = cifs_getattr,
1112 .permission = cifs_permission,
1113 .listxattr = cifs_listxattr,
1114 .fiemap = cifs_fiemap,
1115 .get_acl = cifs_get_acl,
1116 .set_acl = cifs_set_acl,
1117 };
1118
cifs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1119 const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
1120 struct delayed_call *done)
1121 {
1122 char *target_path;
1123
1124 if (!dentry)
1125 return ERR_PTR(-ECHILD);
1126
1127 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
1128 if (!target_path)
1129 return ERR_PTR(-ENOMEM);
1130
1131 spin_lock(&inode->i_lock);
1132 if (likely(CIFS_I(inode)->symlink_target)) {
1133 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
1134 } else {
1135 kfree(target_path);
1136 target_path = ERR_PTR(-EOPNOTSUPP);
1137 }
1138 spin_unlock(&inode->i_lock);
1139
1140 if (!IS_ERR(target_path))
1141 set_delayed_call(done, kfree_link, target_path);
1142
1143 return target_path;
1144 }
1145
1146 const struct inode_operations cifs_symlink_inode_ops = {
1147 .get_link = cifs_get_link,
1148 .setattr = cifs_setattr,
1149 .permission = cifs_permission,
1150 .listxattr = cifs_listxattr,
1151 };
1152
1153 /*
1154 * Advance the EOF marker to after the source range.
1155 */
cifs_precopy_set_eof(struct inode * src_inode,struct cifsInodeInfo * src_cifsi,struct cifs_tcon * src_tcon,unsigned int xid,loff_t src_end)1156 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi,
1157 struct cifs_tcon *src_tcon,
1158 unsigned int xid, loff_t src_end)
1159 {
1160 struct cifsFileInfo *writeable_srcfile;
1161 int rc = -EINVAL;
1162
1163 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY);
1164 if (writeable_srcfile) {
1165 if (src_tcon->ses->server->ops->set_file_size)
1166 rc = src_tcon->ses->server->ops->set_file_size(
1167 xid, src_tcon, writeable_srcfile,
1168 src_inode->i_size, true /* no need to set sparse */);
1169 else
1170 rc = -ENOSYS;
1171 cifsFileInfo_put(writeable_srcfile);
1172 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc);
1173 }
1174
1175 if (rc < 0)
1176 goto set_failed;
1177
1178 netfs_resize_file(&src_cifsi->netfs, src_end, true);
1179 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end);
1180 return 0;
1181
1182 set_failed:
1183 return filemap_write_and_wait(src_inode->i_mapping);
1184 }
1185
1186 /*
1187 * Flush out either the folio that overlaps the beginning of a range in which
1188 * pos resides or the folio that overlaps the end of a range unless that folio
1189 * is entirely within the range we're going to invalidate. We extend the flush
1190 * bounds to encompass the folio.
1191 */
cifs_flush_folio(struct inode * inode,loff_t pos,loff_t * _fstart,loff_t * _fend,bool first)1192 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend,
1193 bool first)
1194 {
1195 struct folio *folio;
1196 unsigned long long fpos, fend;
1197 pgoff_t index = pos / PAGE_SIZE;
1198 size_t size;
1199 int rc = 0;
1200
1201 folio = filemap_get_folio(inode->i_mapping, index);
1202 if (IS_ERR(folio))
1203 return 0;
1204
1205 size = folio_size(folio);
1206 fpos = folio_pos(folio);
1207 fend = fpos + size - 1;
1208 *_fstart = min_t(unsigned long long, *_fstart, fpos);
1209 *_fend = max_t(unsigned long long, *_fend, fend);
1210 if ((first && pos == fpos) || (!first && pos == fend))
1211 goto out;
1212
1213 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend);
1214 out:
1215 folio_put(folio);
1216 return rc;
1217 }
1218
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)1219 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1220 struct file *dst_file, loff_t destoff, loff_t len,
1221 unsigned int remap_flags)
1222 {
1223 struct inode *src_inode = file_inode(src_file);
1224 struct inode *target_inode = file_inode(dst_file);
1225 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1226 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1227 struct cifsFileInfo *smb_file_src = src_file->private_data;
1228 struct cifsFileInfo *smb_file_target = dst_file->private_data;
1229 struct cifs_tcon *target_tcon, *src_tcon;
1230 unsigned long long destend, fstart, fend, old_size, new_size;
1231 unsigned int xid;
1232 int rc;
1233
1234 if (remap_flags & REMAP_FILE_DEDUP)
1235 return -EOPNOTSUPP;
1236 if (remap_flags & ~REMAP_FILE_ADVISORY)
1237 return -EINVAL;
1238
1239 cifs_dbg(FYI, "clone range\n");
1240
1241 xid = get_xid();
1242
1243 if (!smb_file_src || !smb_file_target) {
1244 rc = -EBADF;
1245 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1246 goto out;
1247 }
1248
1249 src_tcon = tlink_tcon(smb_file_src->tlink);
1250 target_tcon = tlink_tcon(smb_file_target->tlink);
1251
1252 /*
1253 * Note: cifs case is easier than btrfs since server responsible for
1254 * checks for proper open modes and file type and if it wants
1255 * server could even support copy of range where source = target
1256 */
1257 lock_two_nondirectories(target_inode, src_inode);
1258
1259 if (len == 0)
1260 len = src_inode->i_size - off;
1261
1262 cifs_dbg(FYI, "clone range\n");
1263
1264 /* Flush the source buffer */
1265 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1266 off + len - 1);
1267 if (rc)
1268 goto unlock;
1269
1270 /* The server-side copy will fail if the source crosses the EOF marker.
1271 * Advance the EOF marker after the flush above to the end of the range
1272 * if it's short of that.
1273 */
1274 if (src_cifsi->netfs.remote_i_size < off + len) {
1275 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1276 if (rc < 0)
1277 goto unlock;
1278 }
1279
1280 new_size = destoff + len;
1281 destend = destoff + len - 1;
1282
1283 /* Flush the folios at either end of the destination range to prevent
1284 * accidental loss of dirty data outside of the range.
1285 */
1286 fstart = destoff;
1287 fend = destend;
1288
1289 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
1290 if (rc)
1291 goto unlock;
1292 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
1293 if (rc)
1294 goto unlock;
1295 if (fend > target_cifsi->netfs.zero_point)
1296 target_cifsi->netfs.zero_point = fend + 1;
1297 old_size = target_cifsi->netfs.remote_i_size;
1298
1299 /* Discard all the folios that overlap the destination region. */
1300 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend);
1301 truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
1302
1303 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1304 i_size_read(target_inode), 0);
1305
1306 rc = -EOPNOTSUPP;
1307 if (target_tcon->ses->server->ops->duplicate_extents) {
1308 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1309 smb_file_src, smb_file_target, off, len, destoff);
1310 if (rc == 0 && new_size > old_size) {
1311 truncate_setsize(target_inode, new_size);
1312 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1313 new_size);
1314 }
1315 if (rc == 0 && new_size > target_cifsi->netfs.zero_point)
1316 target_cifsi->netfs.zero_point = new_size;
1317 }
1318
1319 /* force revalidate of size and timestamps of target file now
1320 that target is updated on the server */
1321 CIFS_I(target_inode)->time = 0;
1322 unlock:
1323 /* although unlocking in the reverse order from locking is not
1324 strictly necessary here it is a little cleaner to be consistent */
1325 unlock_two_nondirectories(src_inode, target_inode);
1326 out:
1327 free_xid(xid);
1328 return rc < 0 ? rc : len;
1329 }
1330
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)1331 ssize_t cifs_file_copychunk_range(unsigned int xid,
1332 struct file *src_file, loff_t off,
1333 struct file *dst_file, loff_t destoff,
1334 size_t len, unsigned int flags)
1335 {
1336 struct inode *src_inode = file_inode(src_file);
1337 struct inode *target_inode = file_inode(dst_file);
1338 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode);
1339 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode);
1340 struct cifsFileInfo *smb_file_src;
1341 struct cifsFileInfo *smb_file_target;
1342 struct cifs_tcon *src_tcon;
1343 struct cifs_tcon *target_tcon;
1344 ssize_t rc;
1345
1346 cifs_dbg(FYI, "copychunk range\n");
1347
1348 if (!src_file->private_data || !dst_file->private_data) {
1349 rc = -EBADF;
1350 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1351 goto out;
1352 }
1353
1354 rc = -EXDEV;
1355 smb_file_target = dst_file->private_data;
1356 smb_file_src = src_file->private_data;
1357 src_tcon = tlink_tcon(smb_file_src->tlink);
1358 target_tcon = tlink_tcon(smb_file_target->tlink);
1359
1360 if (src_tcon->ses != target_tcon->ses) {
1361 cifs_dbg(FYI, "source and target of copy not on same server\n");
1362 goto out;
1363 }
1364
1365 rc = -EOPNOTSUPP;
1366 if (!target_tcon->ses->server->ops->copychunk_range)
1367 goto out;
1368
1369 /*
1370 * Note: cifs case is easier than btrfs since server responsible for
1371 * checks for proper open modes and file type and if it wants
1372 * server could even support copy of range where source = target
1373 */
1374 lock_two_nondirectories(target_inode, src_inode);
1375
1376 cifs_dbg(FYI, "about to flush pages\n");
1377
1378 rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
1379 off + len - 1);
1380 if (rc)
1381 goto unlock;
1382
1383 /* The server-side copy will fail if the source crosses the EOF marker.
1384 * Advance the EOF marker after the flush above to the end of the range
1385 * if it's short of that.
1386 */
1387 if (src_cifsi->netfs.remote_i_size < off + len) {
1388 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len);
1389 if (rc < 0)
1390 goto unlock;
1391 }
1392
1393 /* Flush and invalidate all the folios in the destination region. If
1394 * the copy was successful, then some of the flush is extra overhead,
1395 * but we need to allow for the copy failing in some way (eg. ENOSPC).
1396 */
1397 rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
1398 if (rc)
1399 goto unlock;
1400
1401 fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
1402 i_size_read(target_inode), 0);
1403
1404 rc = file_modified(dst_file);
1405 if (!rc) {
1406 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1407 smb_file_src, smb_file_target, off, len, destoff);
1408 if (rc > 0 && destoff + rc > i_size_read(target_inode)) {
1409 truncate_setsize(target_inode, destoff + rc);
1410 netfs_resize_file(&target_cifsi->netfs,
1411 i_size_read(target_inode), true);
1412 fscache_resize_cookie(cifs_inode_cookie(target_inode),
1413 i_size_read(target_inode));
1414 }
1415 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point)
1416 target_cifsi->netfs.zero_point = destoff + rc;
1417 }
1418
1419 file_accessed(src_file);
1420
1421 /* force revalidate of size and timestamps of target file now
1422 * that target is updated on the server
1423 */
1424 CIFS_I(target_inode)->time = 0;
1425
1426 unlock:
1427 /* although unlocking in the reverse order from locking is not
1428 * strictly necessary here it is a little cleaner to be consistent
1429 */
1430 unlock_two_nondirectories(src_inode, target_inode);
1431
1432 out:
1433 return rc;
1434 }
1435
1436 /*
1437 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1438 * is a dummy operation.
1439 */
cifs_dir_fsync(struct file * file,loff_t start,loff_t end,int datasync)1440 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1441 {
1442 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1443 file, datasync);
1444
1445 return 0;
1446 }
1447
cifs_copy_file_range(struct file * src_file,loff_t off,struct file * dst_file,loff_t destoff,size_t len,unsigned int flags)1448 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1449 struct file *dst_file, loff_t destoff,
1450 size_t len, unsigned int flags)
1451 {
1452 unsigned int xid = get_xid();
1453 ssize_t rc;
1454 struct cifsFileInfo *cfile = dst_file->private_data;
1455
1456 if (cfile->swapfile) {
1457 rc = -EOPNOTSUPP;
1458 free_xid(xid);
1459 return rc;
1460 }
1461
1462 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1463 len, flags);
1464 free_xid(xid);
1465
1466 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1467 rc = splice_copy_file_range(src_file, off, dst_file,
1468 destoff, len);
1469 return rc;
1470 }
1471
1472 const struct file_operations cifs_file_ops = {
1473 .read_iter = cifs_loose_read_iter,
1474 .write_iter = cifs_file_write_iter,
1475 .open = cifs_open,
1476 .release = cifs_close,
1477 .lock = cifs_lock,
1478 .flock = cifs_flock,
1479 .fsync = cifs_fsync,
1480 .flush = cifs_flush,
1481 .mmap = cifs_file_mmap,
1482 .splice_read = filemap_splice_read,
1483 .splice_write = iter_file_splice_write,
1484 .llseek = cifs_llseek,
1485 .unlocked_ioctl = cifs_ioctl,
1486 .copy_file_range = cifs_copy_file_range,
1487 .remap_file_range = cifs_remap_file_range,
1488 .setlease = cifs_setlease,
1489 .fallocate = cifs_fallocate,
1490 };
1491
1492 const struct file_operations cifs_file_strict_ops = {
1493 .read_iter = cifs_strict_readv,
1494 .write_iter = cifs_strict_writev,
1495 .open = cifs_open,
1496 .release = cifs_close,
1497 .lock = cifs_lock,
1498 .flock = cifs_flock,
1499 .fsync = cifs_strict_fsync,
1500 .flush = cifs_flush,
1501 .mmap = cifs_file_strict_mmap,
1502 .splice_read = filemap_splice_read,
1503 .splice_write = iter_file_splice_write,
1504 .llseek = cifs_llseek,
1505 .unlocked_ioctl = cifs_ioctl,
1506 .copy_file_range = cifs_copy_file_range,
1507 .remap_file_range = cifs_remap_file_range,
1508 .setlease = cifs_setlease,
1509 .fallocate = cifs_fallocate,
1510 };
1511
1512 const struct file_operations cifs_file_direct_ops = {
1513 .read_iter = netfs_unbuffered_read_iter,
1514 .write_iter = netfs_file_write_iter,
1515 .open = cifs_open,
1516 .release = cifs_close,
1517 .lock = cifs_lock,
1518 .flock = cifs_flock,
1519 .fsync = cifs_fsync,
1520 .flush = cifs_flush,
1521 .mmap = cifs_file_mmap,
1522 .splice_read = copy_splice_read,
1523 .splice_write = iter_file_splice_write,
1524 .unlocked_ioctl = cifs_ioctl,
1525 .copy_file_range = cifs_copy_file_range,
1526 .remap_file_range = cifs_remap_file_range,
1527 .llseek = cifs_llseek,
1528 .setlease = cifs_setlease,
1529 .fallocate = cifs_fallocate,
1530 };
1531
1532 const struct file_operations cifs_file_nobrl_ops = {
1533 .read_iter = cifs_loose_read_iter,
1534 .write_iter = cifs_file_write_iter,
1535 .open = cifs_open,
1536 .release = cifs_close,
1537 .fsync = cifs_fsync,
1538 .flush = cifs_flush,
1539 .mmap = cifs_file_mmap,
1540 .splice_read = filemap_splice_read,
1541 .splice_write = iter_file_splice_write,
1542 .llseek = cifs_llseek,
1543 .unlocked_ioctl = cifs_ioctl,
1544 .copy_file_range = cifs_copy_file_range,
1545 .remap_file_range = cifs_remap_file_range,
1546 .setlease = cifs_setlease,
1547 .fallocate = cifs_fallocate,
1548 };
1549
1550 const struct file_operations cifs_file_strict_nobrl_ops = {
1551 .read_iter = cifs_strict_readv,
1552 .write_iter = cifs_strict_writev,
1553 .open = cifs_open,
1554 .release = cifs_close,
1555 .fsync = cifs_strict_fsync,
1556 .flush = cifs_flush,
1557 .mmap = cifs_file_strict_mmap,
1558 .splice_read = filemap_splice_read,
1559 .splice_write = iter_file_splice_write,
1560 .llseek = cifs_llseek,
1561 .unlocked_ioctl = cifs_ioctl,
1562 .copy_file_range = cifs_copy_file_range,
1563 .remap_file_range = cifs_remap_file_range,
1564 .setlease = cifs_setlease,
1565 .fallocate = cifs_fallocate,
1566 };
1567
1568 const struct file_operations cifs_file_direct_nobrl_ops = {
1569 .read_iter = netfs_unbuffered_read_iter,
1570 .write_iter = netfs_file_write_iter,
1571 .open = cifs_open,
1572 .release = cifs_close,
1573 .fsync = cifs_fsync,
1574 .flush = cifs_flush,
1575 .mmap = cifs_file_mmap,
1576 .splice_read = copy_splice_read,
1577 .splice_write = iter_file_splice_write,
1578 .unlocked_ioctl = cifs_ioctl,
1579 .copy_file_range = cifs_copy_file_range,
1580 .remap_file_range = cifs_remap_file_range,
1581 .llseek = cifs_llseek,
1582 .setlease = cifs_setlease,
1583 .fallocate = cifs_fallocate,
1584 };
1585
1586 const struct file_operations cifs_dir_ops = {
1587 .iterate_shared = cifs_readdir,
1588 .release = cifs_closedir,
1589 .read = generic_read_dir,
1590 .unlocked_ioctl = cifs_ioctl,
1591 .copy_file_range = cifs_copy_file_range,
1592 .remap_file_range = cifs_remap_file_range,
1593 .llseek = generic_file_llseek,
1594 .fsync = cifs_dir_fsync,
1595 };
1596
1597 static void
cifs_init_once(void * inode)1598 cifs_init_once(void *inode)
1599 {
1600 struct cifsInodeInfo *cifsi = inode;
1601
1602 inode_init_once(&cifsi->netfs.inode);
1603 init_rwsem(&cifsi->lock_sem);
1604 }
1605
1606 static int __init
cifs_init_inodecache(void)1607 cifs_init_inodecache(void)
1608 {
1609 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1610 sizeof(struct cifsInodeInfo),
1611 0, (SLAB_RECLAIM_ACCOUNT|
1612 SLAB_ACCOUNT),
1613 cifs_init_once);
1614 if (cifs_inode_cachep == NULL)
1615 return -ENOMEM;
1616
1617 return 0;
1618 }
1619
1620 static void
cifs_destroy_inodecache(void)1621 cifs_destroy_inodecache(void)
1622 {
1623 /*
1624 * Make sure all delayed rcu free inodes are flushed before we
1625 * destroy cache.
1626 */
1627 rcu_barrier();
1628 kmem_cache_destroy(cifs_inode_cachep);
1629 }
1630
1631 static int
cifs_init_request_bufs(void)1632 cifs_init_request_bufs(void)
1633 {
1634 /*
1635 * SMB2 maximum header size is bigger than CIFS one - no problems to
1636 * allocate some more bytes for CIFS.
1637 */
1638 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1639
1640 if (CIFSMaxBufSize < 8192) {
1641 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1642 Unicode path name has to fit in any SMB/CIFS path based frames */
1643 CIFSMaxBufSize = 8192;
1644 } else if (CIFSMaxBufSize > 1024*127) {
1645 CIFSMaxBufSize = 1024 * 127;
1646 } else {
1647 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1648 }
1649 /*
1650 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1651 CIFSMaxBufSize, CIFSMaxBufSize);
1652 */
1653 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1654 CIFSMaxBufSize + max_hdr_size, 0,
1655 SLAB_HWCACHE_ALIGN, 0,
1656 CIFSMaxBufSize + max_hdr_size,
1657 NULL);
1658 if (cifs_req_cachep == NULL)
1659 return -ENOMEM;
1660
1661 if (cifs_min_rcv < 1)
1662 cifs_min_rcv = 1;
1663 else if (cifs_min_rcv > 64) {
1664 cifs_min_rcv = 64;
1665 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1666 }
1667
1668 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1669 cifs_req_cachep);
1670
1671 if (cifs_req_poolp == NULL) {
1672 kmem_cache_destroy(cifs_req_cachep);
1673 return -ENOMEM;
1674 }
1675 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1676 almost all handle based requests (but not write response, nor is it
1677 sufficient for path based requests). A smaller size would have
1678 been more efficient (compacting multiple slab items on one 4k page)
1679 for the case in which debug was on, but this larger size allows
1680 more SMBs to use small buffer alloc and is still much more
1681 efficient to alloc 1 per page off the slab compared to 17K (5page)
1682 alloc of large cifs buffers even when page debugging is on */
1683 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1684 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1685 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1686 if (cifs_sm_req_cachep == NULL) {
1687 mempool_destroy(cifs_req_poolp);
1688 kmem_cache_destroy(cifs_req_cachep);
1689 return -ENOMEM;
1690 }
1691
1692 if (cifs_min_small < 2)
1693 cifs_min_small = 2;
1694 else if (cifs_min_small > 256) {
1695 cifs_min_small = 256;
1696 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1697 }
1698
1699 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1700 cifs_sm_req_cachep);
1701
1702 if (cifs_sm_req_poolp == NULL) {
1703 mempool_destroy(cifs_req_poolp);
1704 kmem_cache_destroy(cifs_req_cachep);
1705 kmem_cache_destroy(cifs_sm_req_cachep);
1706 return -ENOMEM;
1707 }
1708
1709 return 0;
1710 }
1711
1712 static void
cifs_destroy_request_bufs(void)1713 cifs_destroy_request_bufs(void)
1714 {
1715 mempool_destroy(cifs_req_poolp);
1716 kmem_cache_destroy(cifs_req_cachep);
1717 mempool_destroy(cifs_sm_req_poolp);
1718 kmem_cache_destroy(cifs_sm_req_cachep);
1719 }
1720
init_mids(void)1721 static int init_mids(void)
1722 {
1723 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1724 sizeof(struct mid_q_entry), 0,
1725 SLAB_HWCACHE_ALIGN, NULL);
1726 if (cifs_mid_cachep == NULL)
1727 return -ENOMEM;
1728
1729 /* 3 is a reasonable minimum number of simultaneous operations */
1730 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1731 if (cifs_mid_poolp == NULL) {
1732 kmem_cache_destroy(cifs_mid_cachep);
1733 return -ENOMEM;
1734 }
1735
1736 return 0;
1737 }
1738
destroy_mids(void)1739 static void destroy_mids(void)
1740 {
1741 mempool_destroy(cifs_mid_poolp);
1742 kmem_cache_destroy(cifs_mid_cachep);
1743 }
1744
cifs_init_netfs(void)1745 static int cifs_init_netfs(void)
1746 {
1747 cifs_io_request_cachep =
1748 kmem_cache_create("cifs_io_request",
1749 sizeof(struct cifs_io_request), 0,
1750 SLAB_HWCACHE_ALIGN, NULL);
1751 if (!cifs_io_request_cachep)
1752 goto nomem_req;
1753
1754 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0)
1755 goto nomem_reqpool;
1756
1757 cifs_io_subrequest_cachep =
1758 kmem_cache_create("cifs_io_subrequest",
1759 sizeof(struct cifs_io_subrequest), 0,
1760 SLAB_HWCACHE_ALIGN, NULL);
1761 if (!cifs_io_subrequest_cachep)
1762 goto nomem_subreq;
1763
1764 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0)
1765 goto nomem_subreqpool;
1766
1767 return 0;
1768
1769 nomem_subreqpool:
1770 kmem_cache_destroy(cifs_io_subrequest_cachep);
1771 nomem_subreq:
1772 mempool_destroy(&cifs_io_request_pool);
1773 nomem_reqpool:
1774 kmem_cache_destroy(cifs_io_request_cachep);
1775 nomem_req:
1776 return -ENOMEM;
1777 }
1778
cifs_destroy_netfs(void)1779 static void cifs_destroy_netfs(void)
1780 {
1781 mempool_exit(&cifs_io_subrequest_pool);
1782 kmem_cache_destroy(cifs_io_subrequest_cachep);
1783 mempool_exit(&cifs_io_request_pool);
1784 kmem_cache_destroy(cifs_io_request_cachep);
1785 }
1786
1787 static int __init
init_cifs(void)1788 init_cifs(void)
1789 {
1790 int rc = 0;
1791 cifs_proc_init();
1792 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1793 /*
1794 * Initialize Global counters
1795 */
1796 atomic_set(&sesInfoAllocCount, 0);
1797 atomic_set(&tconInfoAllocCount, 0);
1798 atomic_set(&tcpSesNextId, 0);
1799 atomic_set(&tcpSesAllocCount, 0);
1800 atomic_set(&tcpSesReconnectCount, 0);
1801 atomic_set(&tconInfoReconnectCount, 0);
1802
1803 atomic_set(&buf_alloc_count, 0);
1804 atomic_set(&small_buf_alloc_count, 0);
1805 #ifdef CONFIG_CIFS_STATS2
1806 atomic_set(&total_buf_alloc_count, 0);
1807 atomic_set(&total_small_buf_alloc_count, 0);
1808 if (slow_rsp_threshold < 1)
1809 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1810 else if (slow_rsp_threshold > 32767)
1811 cifs_dbg(VFS,
1812 "slow response threshold set higher than recommended (0 to 32767)\n");
1813 #endif /* CONFIG_CIFS_STATS2 */
1814
1815 atomic_set(&mid_count, 0);
1816 GlobalCurrentXid = 0;
1817 GlobalTotalActiveXid = 0;
1818 GlobalMaxActiveXid = 0;
1819 spin_lock_init(&cifs_tcp_ses_lock);
1820 spin_lock_init(&GlobalMid_Lock);
1821
1822 cifs_lock_secret = get_random_u32();
1823
1824 if (cifs_max_pending < 2) {
1825 cifs_max_pending = 2;
1826 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1827 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1828 cifs_max_pending = CIFS_MAX_REQ;
1829 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1830 CIFS_MAX_REQ);
1831 }
1832
1833 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */
1834 if (dir_cache_timeout > 65000) {
1835 dir_cache_timeout = 65000;
1836 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
1837 }
1838
1839 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1840 if (!cifsiod_wq) {
1841 rc = -ENOMEM;
1842 goto out_clean_proc;
1843 }
1844
1845 /*
1846 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1847 * so that we don't launch too many worker threads but
1848 * Documentation/core-api/workqueue.rst recommends setting it to 0
1849 */
1850
1851 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1852 decrypt_wq = alloc_workqueue("smb3decryptd",
1853 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1854 if (!decrypt_wq) {
1855 rc = -ENOMEM;
1856 goto out_destroy_cifsiod_wq;
1857 }
1858
1859 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
1860 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1861 if (!fileinfo_put_wq) {
1862 rc = -ENOMEM;
1863 goto out_destroy_decrypt_wq;
1864 }
1865
1866 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1867 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1868 if (!cifsoplockd_wq) {
1869 rc = -ENOMEM;
1870 goto out_destroy_fileinfo_put_wq;
1871 }
1872
1873 deferredclose_wq = alloc_workqueue("deferredclose",
1874 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1875 if (!deferredclose_wq) {
1876 rc = -ENOMEM;
1877 goto out_destroy_cifsoplockd_wq;
1878 }
1879
1880 serverclose_wq = alloc_workqueue("serverclose",
1881 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1882 if (!serverclose_wq) {
1883 rc = -ENOMEM;
1884 goto out_destroy_deferredclose_wq;
1885 }
1886
1887 rc = cifs_init_inodecache();
1888 if (rc)
1889 goto out_destroy_serverclose_wq;
1890
1891 rc = cifs_init_netfs();
1892 if (rc)
1893 goto out_destroy_inodecache;
1894
1895 rc = init_mids();
1896 if (rc)
1897 goto out_destroy_netfs;
1898
1899 rc = cifs_init_request_bufs();
1900 if (rc)
1901 goto out_destroy_mids;
1902
1903 #ifdef CONFIG_CIFS_DFS_UPCALL
1904 rc = dfs_cache_init();
1905 if (rc)
1906 goto out_destroy_request_bufs;
1907 #endif /* CONFIG_CIFS_DFS_UPCALL */
1908 #ifdef CONFIG_CIFS_UPCALL
1909 rc = init_cifs_spnego();
1910 if (rc)
1911 goto out_destroy_dfs_cache;
1912 #endif /* CONFIG_CIFS_UPCALL */
1913 #ifdef CONFIG_CIFS_SWN_UPCALL
1914 rc = cifs_genl_init();
1915 if (rc)
1916 goto out_register_key_type;
1917 #endif /* CONFIG_CIFS_SWN_UPCALL */
1918
1919 rc = init_cifs_idmap();
1920 if (rc)
1921 goto out_cifs_swn_init;
1922
1923 rc = register_filesystem(&cifs_fs_type);
1924 if (rc)
1925 goto out_init_cifs_idmap;
1926
1927 rc = register_filesystem(&smb3_fs_type);
1928 if (rc) {
1929 unregister_filesystem(&cifs_fs_type);
1930 goto out_init_cifs_idmap;
1931 }
1932
1933 return 0;
1934
1935 out_init_cifs_idmap:
1936 exit_cifs_idmap();
1937 out_cifs_swn_init:
1938 #ifdef CONFIG_CIFS_SWN_UPCALL
1939 cifs_genl_exit();
1940 out_register_key_type:
1941 #endif
1942 #ifdef CONFIG_CIFS_UPCALL
1943 exit_cifs_spnego();
1944 out_destroy_dfs_cache:
1945 #endif
1946 #ifdef CONFIG_CIFS_DFS_UPCALL
1947 dfs_cache_destroy();
1948 out_destroy_request_bufs:
1949 #endif
1950 cifs_destroy_request_bufs();
1951 out_destroy_mids:
1952 destroy_mids();
1953 out_destroy_netfs:
1954 cifs_destroy_netfs();
1955 out_destroy_inodecache:
1956 cifs_destroy_inodecache();
1957 out_destroy_serverclose_wq:
1958 destroy_workqueue(serverclose_wq);
1959 out_destroy_deferredclose_wq:
1960 destroy_workqueue(deferredclose_wq);
1961 out_destroy_cifsoplockd_wq:
1962 destroy_workqueue(cifsoplockd_wq);
1963 out_destroy_fileinfo_put_wq:
1964 destroy_workqueue(fileinfo_put_wq);
1965 out_destroy_decrypt_wq:
1966 destroy_workqueue(decrypt_wq);
1967 out_destroy_cifsiod_wq:
1968 destroy_workqueue(cifsiod_wq);
1969 out_clean_proc:
1970 cifs_proc_clean();
1971 return rc;
1972 }
1973
1974 static void __exit
exit_cifs(void)1975 exit_cifs(void)
1976 {
1977 cifs_dbg(NOISY, "exit_smb3\n");
1978 unregister_filesystem(&cifs_fs_type);
1979 unregister_filesystem(&smb3_fs_type);
1980 cifs_release_automount_timer();
1981 exit_cifs_idmap();
1982 #ifdef CONFIG_CIFS_SWN_UPCALL
1983 cifs_genl_exit();
1984 #endif
1985 #ifdef CONFIG_CIFS_UPCALL
1986 exit_cifs_spnego();
1987 #endif
1988 #ifdef CONFIG_CIFS_DFS_UPCALL
1989 dfs_cache_destroy();
1990 #endif
1991 cifs_destroy_request_bufs();
1992 destroy_mids();
1993 cifs_destroy_netfs();
1994 cifs_destroy_inodecache();
1995 destroy_workqueue(deferredclose_wq);
1996 destroy_workqueue(cifsoplockd_wq);
1997 destroy_workqueue(decrypt_wq);
1998 destroy_workqueue(fileinfo_put_wq);
1999 destroy_workqueue(serverclose_wq);
2000 destroy_workqueue(cifsiod_wq);
2001 cifs_proc_clean();
2002 }
2003
2004 MODULE_AUTHOR("Steve French");
2005 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
2006 MODULE_DESCRIPTION
2007 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
2008 "also older servers complying with the SNIA CIFS Specification)");
2009 MODULE_VERSION(CIFS_VERSION);
2010 MODULE_SOFTDEP("ecb");
2011 MODULE_SOFTDEP("hmac");
2012 MODULE_SOFTDEP("md5");
2013 MODULE_SOFTDEP("nls");
2014 MODULE_SOFTDEP("aes");
2015 MODULE_SOFTDEP("cmac");
2016 MODULE_SOFTDEP("sha256");
2017 MODULE_SOFTDEP("sha512");
2018 MODULE_SOFTDEP("aead2");
2019 MODULE_SOFTDEP("ccm");
2020 MODULE_SOFTDEP("gcm");
2021 module_init(init_cifs)
2022 module_exit(exit_cifs)
2023