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1/*
2 * fs/cifs/cifsfs.c
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 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24/* Note that BB means BUGBUG (ie something to fix eventually) */
25
26#include <linux/module.h>
27#include <linux/fs.h>
28#include <linux/mount.h>
29#include <linux/slab.h>
30#include <linux/init.h>
31#include <linux/list.h>
32#include <linux/seq_file.h>
33#include <linux/vfs.h>
34#include <linux/mempool.h>
35#include <linux/delay.h>
36#include <linux/kthread.h>
37#include <linux/freezer.h>
38#include <linux/namei.h>
39#include <linux/random.h>
40#include <linux/uuid.h>
41#include <linux/xattr.h>
42#include <net/ipv6.h>
43#include "cifsfs.h"
44#include "cifspdu.h"
45#define DECLARE_GLOBALS_HERE
46#include "cifsglob.h"
47#include "cifsproto.h"
48#include "cifs_debug.h"
49#include "cifs_fs_sb.h"
50#include <linux/mm.h>
51#include <linux/key-type.h>
52#include "cifs_spnego.h"
53#include "fscache.h"
54#include "smb2pdu.h"
55
56int cifsFYI = 0;
57bool traceSMB;
58bool enable_oplocks = true;
59bool linuxExtEnabled = true;
60bool lookupCacheEnabled = true;
61unsigned int global_secflags = CIFSSEC_DEF;
62/* unsigned int ntlmv2_support = 0; */
63unsigned int sign_CIFS_PDUs = 1;
64static const struct super_operations cifs_super_ops;
65unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66module_param(CIFSMaxBufSize, uint, 0444);
67MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70module_param(cifs_min_rcv, uint, 0444);
71MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
72 "1 to 64");
73unsigned int cifs_min_small = 30;
74module_param(cifs_min_small, uint, 0444);
75MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
76 "Range: 2 to 256");
77unsigned int cifs_max_pending = CIFS_MAX_REQ;
78module_param(cifs_max_pending, uint, 0444);
79MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81module_param(enable_oplocks, bool, 0644);
82MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
83
84extern mempool_t *cifs_sm_req_poolp;
85extern mempool_t *cifs_req_poolp;
86extern mempool_t *cifs_mid_poolp;
87
88struct workqueue_struct *cifsiod_wq;
89struct workqueue_struct *cifsoplockd_wq;
90__u32 cifs_lock_secret;
91
92/*
93 * Bumps refcount for cifs super block.
94 * Note that it should be only called if a referece to VFS super block is
95 * already held, e.g. in open-type syscalls context. Otherwise it can race with
96 * atomic_dec_and_test in deactivate_locked_super.
97 */
98void
99cifs_sb_active(struct super_block *sb)
100{
101 struct cifs_sb_info *server = CIFS_SB(sb);
102
103 if (atomic_inc_return(&server->active) == 1)
104 atomic_inc(&sb->s_active);
105}
106
107void
108cifs_sb_deactive(struct super_block *sb)
109{
110 struct cifs_sb_info *server = CIFS_SB(sb);
111
112 if (atomic_dec_and_test(&server->active))
113 deactivate_super(sb);
114}
115
116static int
117cifs_read_super(struct super_block *sb)
118{
119 struct inode *inode;
120 struct cifs_sb_info *cifs_sb;
121 struct cifs_tcon *tcon;
122 int rc = 0;
123
124 cifs_sb = CIFS_SB(sb);
125 tcon = cifs_sb_master_tcon(cifs_sb);
126
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128 sb->s_flags |= SB_POSIXACL;
129
130 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
131 sb->s_maxbytes = MAX_LFS_FILESIZE;
132 else
133 sb->s_maxbytes = MAX_NON_LFS;
134
135 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
136 sb->s_time_gran = 100;
137
138 sb->s_magic = CIFS_MAGIC_NUMBER;
139 sb->s_op = &cifs_super_ops;
140 sb->s_xattr = cifs_xattr_handlers;
141 rc = super_setup_bdi(sb);
142 if (rc)
143 goto out_no_root;
144 /* tune readahead according to rsize */
145 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
146
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_root_iget(sb);
150
151 if (IS_ERR(inode)) {
152 rc = PTR_ERR(inode);
153 goto out_no_root;
154 }
155
156 if (tcon->nocase)
157 sb->s_d_op = &cifs_ci_dentry_ops;
158 else
159 sb->s_d_op = &cifs_dentry_ops;
160
161 sb->s_root = d_make_root(inode);
162 if (!sb->s_root) {
163 rc = -ENOMEM;
164 goto out_no_root;
165 }
166
167#ifdef CONFIG_CIFS_NFSD_EXPORT
168 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
169 cifs_dbg(FYI, "export ops supported\n");
170 sb->s_export_op = &cifs_export_ops;
171 }
172#endif /* CONFIG_CIFS_NFSD_EXPORT */
173
174 return 0;
175
176out_no_root:
177 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
178 return rc;
179}
180
181static void cifs_kill_sb(struct super_block *sb)
182{
183 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
184 kill_anon_super(sb);
185 cifs_umount(cifs_sb);
186}
187
188static int
189cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
190{
191 struct super_block *sb = dentry->d_sb;
192 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
193 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
194 struct TCP_Server_Info *server = tcon->ses->server;
195 unsigned int xid;
196 int rc = 0;
197
198 xid = get_xid();
199
200 /*
201 * PATH_MAX may be too long - it would presumably be total path,
202 * but note that some servers (includinng Samba 3) have a shorter
203 * maximum path.
204 *
205 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
206 */
207 buf->f_namelen = PATH_MAX;
208 buf->f_files = 0; /* undefined */
209 buf->f_ffree = 0; /* unlimited */
210
211 if (server->ops->queryfs)
212 rc = server->ops->queryfs(xid, tcon, buf);
213
214 free_xid(xid);
215 return 0;
216}
217
218static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
219{
220 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
221 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
222 struct TCP_Server_Info *server = tcon->ses->server;
223
224 if (server->ops->fallocate)
225 return server->ops->fallocate(file, tcon, mode, off, len);
226
227 return -EOPNOTSUPP;
228}
229
230static int cifs_permission(struct inode *inode, int mask)
231{
232 struct cifs_sb_info *cifs_sb;
233
234 cifs_sb = CIFS_SB(inode->i_sb);
235
236 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
237 if ((mask & MAY_EXEC) && !execute_ok(inode))
238 return -EACCES;
239 else
240 return 0;
241 } else /* file mode might have been restricted at mount time
242 on the client (above and beyond ACL on servers) for
243 servers which do not support setting and viewing mode bits,
244 so allowing client to check permissions is useful */
245 return generic_permission(inode, mask);
246}
247
248static struct kmem_cache *cifs_inode_cachep;
249static struct kmem_cache *cifs_req_cachep;
250static struct kmem_cache *cifs_mid_cachep;
251static struct kmem_cache *cifs_sm_req_cachep;
252mempool_t *cifs_sm_req_poolp;
253mempool_t *cifs_req_poolp;
254mempool_t *cifs_mid_poolp;
255
256static struct inode *
257cifs_alloc_inode(struct super_block *sb)
258{
259 struct cifsInodeInfo *cifs_inode;
260 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
261 if (!cifs_inode)
262 return NULL;
263 cifs_inode->cifsAttrs = 0x20; /* default */
264 cifs_inode->time = 0;
265 /*
266 * Until the file is open and we have gotten oplock info back from the
267 * server, can not assume caching of file data or metadata.
268 */
269 cifs_set_oplock_level(cifs_inode, 0);
270 cifs_inode->flags = 0;
271 spin_lock_init(&cifs_inode->writers_lock);
272 cifs_inode->writers = 0;
273 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
274 cifs_inode->server_eof = 0;
275 cifs_inode->uniqueid = 0;
276 cifs_inode->createtime = 0;
277 cifs_inode->epoch = 0;
278 generate_random_uuid(cifs_inode->lease_key);
279
280 /*
281 * Can not set i_flags here - they get immediately overwritten to zero
282 * by the VFS.
283 */
284 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
285 INIT_LIST_HEAD(&cifs_inode->openFileList);
286 INIT_LIST_HEAD(&cifs_inode->llist);
287 return &cifs_inode->vfs_inode;
288}
289
290static void cifs_i_callback(struct rcu_head *head)
291{
292 struct inode *inode = container_of(head, struct inode, i_rcu);
293 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
294}
295
296static void
297cifs_destroy_inode(struct inode *inode)
298{
299 call_rcu(&inode->i_rcu, cifs_i_callback);
300}
301
302static void
303cifs_evict_inode(struct inode *inode)
304{
305 truncate_inode_pages_final(&inode->i_data);
306 clear_inode(inode);
307 cifs_fscache_release_inode_cookie(inode);
308}
309
310static void
311cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
312{
313 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
314 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
315
316 seq_puts(s, ",addr=");
317
318 switch (server->dstaddr.ss_family) {
319 case AF_INET:
320 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
321 break;
322 case AF_INET6:
323 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
324 if (sa6->sin6_scope_id)
325 seq_printf(s, "%%%u", sa6->sin6_scope_id);
326 break;
327 default:
328 seq_puts(s, "(unknown)");
329 }
330 if (server->rdma)
331 seq_puts(s, ",rdma");
332}
333
334static void
335cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
336{
337 if (ses->sectype == Unspecified) {
338 if (ses->user_name == NULL)
339 seq_puts(s, ",sec=none");
340 return;
341 }
342
343 seq_puts(s, ",sec=");
344
345 switch (ses->sectype) {
346 case LANMAN:
347 seq_puts(s, "lanman");
348 break;
349 case NTLMv2:
350 seq_puts(s, "ntlmv2");
351 break;
352 case NTLM:
353 seq_puts(s, "ntlm");
354 break;
355 case Kerberos:
356 seq_puts(s, "krb5");
357 break;
358 case RawNTLMSSP:
359 seq_puts(s, "ntlmssp");
360 break;
361 default:
362 /* shouldn't ever happen */
363 seq_puts(s, "unknown");
364 break;
365 }
366
367 if (ses->sign)
368 seq_puts(s, "i");
369}
370
371static void
372cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
373{
374 seq_puts(s, ",cache=");
375
376 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
377 seq_puts(s, "strict");
378 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
379 seq_puts(s, "none");
380 else
381 seq_puts(s, "loose");
382}
383
384static void
385cifs_show_nls(struct seq_file *s, struct nls_table *cur)
386{
387 struct nls_table *def;
388
389 /* Display iocharset= option if it's not default charset */
390 def = load_nls_default();
391 if (def != cur)
392 seq_printf(s, ",iocharset=%s", cur->charset);
393 unload_nls(def);
394}
395
396/*
397 * cifs_show_options() is for displaying mount options in /proc/mounts.
398 * Not all settable options are displayed but most of the important
399 * ones are.
400 */
401static int
402cifs_show_options(struct seq_file *s, struct dentry *root)
403{
404 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
405 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
406 struct sockaddr *srcaddr;
407 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
408
409 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
410 cifs_show_security(s, tcon->ses);
411 cifs_show_cache_flavor(s, cifs_sb);
412
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
414 seq_puts(s, ",multiuser");
415 else if (tcon->ses->user_name)
416 seq_show_option(s, "username", tcon->ses->user_name);
417
418 if (tcon->ses->domainName)
419 seq_show_option(s, "domain", tcon->ses->domainName);
420
421 if (srcaddr->sa_family != AF_UNSPEC) {
422 struct sockaddr_in *saddr4;
423 struct sockaddr_in6 *saddr6;
424 saddr4 = (struct sockaddr_in *)srcaddr;
425 saddr6 = (struct sockaddr_in6 *)srcaddr;
426 if (srcaddr->sa_family == AF_INET6)
427 seq_printf(s, ",srcaddr=%pI6c",
428 &saddr6->sin6_addr);
429 else if (srcaddr->sa_family == AF_INET)
430 seq_printf(s, ",srcaddr=%pI4",
431 &saddr4->sin_addr.s_addr);
432 else
433 seq_printf(s, ",srcaddr=BAD-AF:%i",
434 (int)(srcaddr->sa_family));
435 }
436
437 seq_printf(s, ",uid=%u",
438 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
440 seq_puts(s, ",forceuid");
441 else
442 seq_puts(s, ",noforceuid");
443
444 seq_printf(s, ",gid=%u",
445 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
447 seq_puts(s, ",forcegid");
448 else
449 seq_puts(s, ",noforcegid");
450
451 cifs_show_address(s, tcon->ses->server);
452
453 if (!tcon->unix_ext)
454 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
455 cifs_sb->mnt_file_mode,
456 cifs_sb->mnt_dir_mode);
457
458 cifs_show_nls(s, cifs_sb->local_nls);
459
460 if (tcon->seal)
461 seq_puts(s, ",seal");
462 if (tcon->nocase)
463 seq_puts(s, ",nocase");
464 if (tcon->retry)
465 seq_puts(s, ",hard");
466 else
467 seq_puts(s, ",soft");
468 if (tcon->use_persistent)
469 seq_puts(s, ",persistenthandles");
470 else if (tcon->use_resilient)
471 seq_puts(s, ",resilienthandles");
472 if (tcon->unix_ext)
473 seq_puts(s, ",unix");
474 else
475 seq_puts(s, ",nounix");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
477 seq_puts(s, ",posixpaths");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
479 seq_puts(s, ",setuids");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
481 seq_puts(s, ",idsfromsid");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
483 seq_puts(s, ",serverino");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
485 seq_puts(s, ",rwpidforward");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
487 seq_puts(s, ",forcemand");
488 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
489 seq_puts(s, ",nouser_xattr");
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
491 seq_puts(s, ",mapchars");
492 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
493 seq_puts(s, ",mapposix");
494 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
495 seq_puts(s, ",sfu");
496 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
497 seq_puts(s, ",nobrl");
498 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
499 seq_puts(s, ",cifsacl");
500 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
501 seq_puts(s, ",dynperm");
502 if (root->d_sb->s_flags & SB_POSIXACL)
503 seq_puts(s, ",acl");
504 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
505 seq_puts(s, ",mfsymlinks");
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
507 seq_puts(s, ",fsc");
508 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
509 seq_puts(s, ",nostrictsync");
510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
511 seq_puts(s, ",noperm");
512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
513 seq_printf(s, ",backupuid=%u",
514 from_kuid_munged(&init_user_ns,
515 cifs_sb->mnt_backupuid));
516 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
517 seq_printf(s, ",backupgid=%u",
518 from_kgid_munged(&init_user_ns,
519 cifs_sb->mnt_backupgid));
520
521 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
522 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
523 seq_printf(s, ",echo_interval=%lu",
524 tcon->ses->server->echo_interval / HZ);
525 /* convert actimeo and display it in seconds */
526 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
527
528 return 0;
529}
530
531static void cifs_umount_begin(struct super_block *sb)
532{
533 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
534 struct cifs_tcon *tcon;
535
536 if (cifs_sb == NULL)
537 return;
538
539 tcon = cifs_sb_master_tcon(cifs_sb);
540
541 spin_lock(&cifs_tcp_ses_lock);
542 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
543 /* we have other mounts to same share or we have
544 already tried to force umount this and woken up
545 all waiting network requests, nothing to do */
546 spin_unlock(&cifs_tcp_ses_lock);
547 return;
548 } else if (tcon->tc_count == 1)
549 tcon->tidStatus = CifsExiting;
550 spin_unlock(&cifs_tcp_ses_lock);
551
552 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
553 /* cancel_notify_requests(tcon); */
554 if (tcon->ses && tcon->ses->server) {
555 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
556 wake_up_all(&tcon->ses->server->request_q);
557 wake_up_all(&tcon->ses->server->response_q);
558 msleep(1); /* yield */
559 /* we have to kick the requests once more */
560 wake_up_all(&tcon->ses->server->response_q);
561 msleep(1);
562 }
563
564 return;
565}
566
567#ifdef CONFIG_CIFS_STATS2
568static int cifs_show_stats(struct seq_file *s, struct dentry *root)
569{
570 /* BB FIXME */
571 return 0;
572}
573#endif
574
575static int cifs_remount(struct super_block *sb, int *flags, char *data)
576{
577 sync_filesystem(sb);
578 *flags |= SB_NODIRATIME;
579 return 0;
580}
581
582static int cifs_drop_inode(struct inode *inode)
583{
584 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
585
586 /* no serverino => unconditional eviction */
587 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
588 generic_drop_inode(inode);
589}
590
591static const struct super_operations cifs_super_ops = {
592 .statfs = cifs_statfs,
593 .alloc_inode = cifs_alloc_inode,
594 .destroy_inode = cifs_destroy_inode,
595 .drop_inode = cifs_drop_inode,
596 .evict_inode = cifs_evict_inode,
597/* .delete_inode = cifs_delete_inode, */ /* Do not need above
598 function unless later we add lazy close of inodes or unless the
599 kernel forgets to call us with the same number of releases (closes)
600 as opens */
601 .show_options = cifs_show_options,
602 .umount_begin = cifs_umount_begin,
603 .remount_fs = cifs_remount,
604#ifdef CONFIG_CIFS_STATS2
605 .show_stats = cifs_show_stats,
606#endif
607};
608
609/*
610 * Get root dentry from superblock according to prefix path mount option.
611 * Return dentry with refcount + 1 on success and NULL otherwise.
612 */
613static struct dentry *
614cifs_get_root(struct smb_vol *vol, struct super_block *sb)
615{
616 struct dentry *dentry;
617 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
618 char *full_path = NULL;
619 char *s, *p;
620 char sep;
621
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
623 return dget(sb->s_root);
624
625 full_path = cifs_build_path_to_root(vol, cifs_sb,
626 cifs_sb_master_tcon(cifs_sb), 0);
627 if (full_path == NULL)
628 return ERR_PTR(-ENOMEM);
629
630 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
631
632 sep = CIFS_DIR_SEP(cifs_sb);
633 dentry = dget(sb->s_root);
634 p = s = full_path;
635
636 do {
637 struct inode *dir = d_inode(dentry);
638 struct dentry *child;
639
640 if (!dir) {
641 dput(dentry);
642 dentry = ERR_PTR(-ENOENT);
643 break;
644 }
645 if (!S_ISDIR(dir->i_mode)) {
646 dput(dentry);
647 dentry = ERR_PTR(-ENOTDIR);
648 break;
649 }
650
651 /* skip separators */
652 while (*s == sep)
653 s++;
654 if (!*s)
655 break;
656 p = s++;
657 /* next separator */
658 while (*s && *s != sep)
659 s++;
660
661 child = lookup_one_len_unlocked(p, dentry, s - p);
662 dput(dentry);
663 dentry = child;
664 } while (!IS_ERR(dentry));
665 kfree(full_path);
666 return dentry;
667}
668
669static int cifs_set_super(struct super_block *sb, void *data)
670{
671 struct cifs_mnt_data *mnt_data = data;
672 sb->s_fs_info = mnt_data->cifs_sb;
673 return set_anon_super(sb, NULL);
674}
675
676static struct dentry *
677cifs_do_mount(struct file_system_type *fs_type,
678 int flags, const char *dev_name, void *data)
679{
680 int rc;
681 struct super_block *sb;
682 struct cifs_sb_info *cifs_sb;
683 struct smb_vol *volume_info;
684 struct cifs_mnt_data mnt_data;
685 struct dentry *root;
686
687 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
688
689 volume_info = cifs_get_volume_info((char *)data, dev_name);
690 if (IS_ERR(volume_info))
691 return ERR_CAST(volume_info);
692
693 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
694 if (cifs_sb == NULL) {
695 root = ERR_PTR(-ENOMEM);
696 goto out_nls;
697 }
698
699 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
700 if (cifs_sb->mountdata == NULL) {
701 root = ERR_PTR(-ENOMEM);
702 goto out_free;
703 }
704
705 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
706 if (rc) {
707 root = ERR_PTR(rc);
708 goto out_free;
709 }
710
711 rc = cifs_mount(cifs_sb, volume_info);
712 if (rc) {
713 if (!(flags & SB_SILENT))
714 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
715 rc);
716 root = ERR_PTR(rc);
717 goto out_free;
718 }
719
720 mnt_data.vol = volume_info;
721 mnt_data.cifs_sb = cifs_sb;
722 mnt_data.flags = flags;
723
724 /* BB should we make this contingent on mount parm? */
725 flags |= SB_NODIRATIME | SB_NOATIME;
726
727 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
728 if (IS_ERR(sb)) {
729 root = ERR_CAST(sb);
730 cifs_umount(cifs_sb);
731 goto out;
732 }
733
734 if (sb->s_root) {
735 cifs_dbg(FYI, "Use existing superblock\n");
736 cifs_umount(cifs_sb);
737 } else {
738 rc = cifs_read_super(sb);
739 if (rc) {
740 root = ERR_PTR(rc);
741 goto out_super;
742 }
743
744 sb->s_flags |= SB_ACTIVE;
745 }
746
747 root = cifs_get_root(volume_info, sb);
748 if (IS_ERR(root))
749 goto out_super;
750
751 cifs_dbg(FYI, "dentry root is: %p\n", root);
752 goto out;
753
754out_super:
755 deactivate_locked_super(sb);
756out:
757 cifs_cleanup_volume_info(volume_info);
758 return root;
759
760out_free:
761 kfree(cifs_sb->prepath);
762 kfree(cifs_sb->mountdata);
763 kfree(cifs_sb);
764out_nls:
765 unload_nls(volume_info->local_nls);
766 goto out;
767}
768
769static ssize_t
770cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
771{
772 ssize_t rc;
773 struct inode *inode = file_inode(iocb->ki_filp);
774
775 if (iocb->ki_filp->f_flags & O_DIRECT)
776 return cifs_user_readv(iocb, iter);
777
778 rc = cifs_revalidate_mapping(inode);
779 if (rc)
780 return rc;
781
782 return generic_file_read_iter(iocb, iter);
783}
784
785static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
786{
787 struct inode *inode = file_inode(iocb->ki_filp);
788 struct cifsInodeInfo *cinode = CIFS_I(inode);
789 ssize_t written;
790 int rc;
791
792 if (iocb->ki_filp->f_flags & O_DIRECT) {
793 written = cifs_user_writev(iocb, from);
794 if (written > 0 && CIFS_CACHE_READ(cinode)) {
795 cifs_zap_mapping(inode);
796 cifs_dbg(FYI,
797 "Set no oplock for inode=%p after a write operation\n",
798 inode);
799 cinode->oplock = 0;
800 }
801 return written;
802 }
803
804 written = cifs_get_writer(cinode);
805 if (written)
806 return written;
807
808 written = generic_file_write_iter(iocb, from);
809
810 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
811 goto out;
812
813 rc = filemap_fdatawrite(inode->i_mapping);
814 if (rc)
815 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
816 rc, inode);
817
818out:
819 cifs_put_writer(cinode);
820 return written;
821}
822
823static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
824{
825 /*
826 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
827 * the cached file length
828 */
829 if (whence != SEEK_SET && whence != SEEK_CUR) {
830 int rc;
831 struct inode *inode = file_inode(file);
832
833 /*
834 * We need to be sure that all dirty pages are written and the
835 * server has the newest file length.
836 */
837 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
838 inode->i_mapping->nrpages != 0) {
839 rc = filemap_fdatawait(inode->i_mapping);
840 if (rc) {
841 mapping_set_error(inode->i_mapping, rc);
842 return rc;
843 }
844 }
845 /*
846 * Some applications poll for the file length in this strange
847 * way so we must seek to end on non-oplocked files by
848 * setting the revalidate time to zero.
849 */
850 CIFS_I(inode)->time = 0;
851
852 rc = cifs_revalidate_file_attr(file);
853 if (rc < 0)
854 return (loff_t)rc;
855 }
856 return generic_file_llseek(file, offset, whence);
857}
858
859static int
860cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
861{
862 /*
863 * Note that this is called by vfs setlease with i_lock held to
864 * protect *lease from going away.
865 */
866 struct inode *inode = file_inode(file);
867 struct cifsFileInfo *cfile = file->private_data;
868
869 if (!(S_ISREG(inode->i_mode)))
870 return -EINVAL;
871
872 /* Check if file is oplocked if this is request for new lease */
873 if (arg == F_UNLCK ||
874 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
875 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
876 return generic_setlease(file, arg, lease, priv);
877 else if (tlink_tcon(cfile->tlink)->local_lease &&
878 !CIFS_CACHE_READ(CIFS_I(inode)))
879 /*
880 * If the server claims to support oplock on this file, then we
881 * still need to check oplock even if the local_lease mount
882 * option is set, but there are servers which do not support
883 * oplock for which this mount option may be useful if the user
884 * knows that the file won't be changed on the server by anyone
885 * else.
886 */
887 return generic_setlease(file, arg, lease, priv);
888 else
889 return -EAGAIN;
890}
891
892struct file_system_type cifs_fs_type = {
893 .owner = THIS_MODULE,
894 .name = "cifs",
895 .mount = cifs_do_mount,
896 .kill_sb = cifs_kill_sb,
897 /* .fs_flags */
898};
899MODULE_ALIAS_FS("cifs");
900const struct inode_operations cifs_dir_inode_ops = {
901 .create = cifs_create,
902 .atomic_open = cifs_atomic_open,
903 .lookup = cifs_lookup,
904 .getattr = cifs_getattr,
905 .unlink = cifs_unlink,
906 .link = cifs_hardlink,
907 .mkdir = cifs_mkdir,
908 .rmdir = cifs_rmdir,
909 .rename = cifs_rename2,
910 .permission = cifs_permission,
911 .setattr = cifs_setattr,
912 .symlink = cifs_symlink,
913 .mknod = cifs_mknod,
914 .listxattr = cifs_listxattr,
915};
916
917const struct inode_operations cifs_file_inode_ops = {
918 .setattr = cifs_setattr,
919 .getattr = cifs_getattr,
920 .permission = cifs_permission,
921 .listxattr = cifs_listxattr,
922};
923
924const struct inode_operations cifs_symlink_inode_ops = {
925 .get_link = cifs_get_link,
926 .permission = cifs_permission,
927 .listxattr = cifs_listxattr,
928};
929
930static int cifs_clone_file_range(struct file *src_file, loff_t off,
931 struct file *dst_file, loff_t destoff, u64 len)
932{
933 struct inode *src_inode = file_inode(src_file);
934 struct inode *target_inode = file_inode(dst_file);
935 struct cifsFileInfo *smb_file_src = src_file->private_data;
936 struct cifsFileInfo *smb_file_target = dst_file->private_data;
937 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
938 unsigned int xid;
939 int rc;
940
941 cifs_dbg(FYI, "clone range\n");
942
943 xid = get_xid();
944
945 if (!src_file->private_data || !dst_file->private_data) {
946 rc = -EBADF;
947 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
948 goto out;
949 }
950
951 /*
952 * Note: cifs case is easier than btrfs since server responsible for
953 * checks for proper open modes and file type and if it wants
954 * server could even support copy of range where source = target
955 */
956 lock_two_nondirectories(target_inode, src_inode);
957
958 if (len == 0)
959 len = src_inode->i_size - off;
960
961 cifs_dbg(FYI, "about to flush pages\n");
962 /* should we flush first and last page first */
963 truncate_inode_pages_range(&target_inode->i_data, destoff,
964 PAGE_ALIGN(destoff + len)-1);
965
966 if (target_tcon->ses->server->ops->duplicate_extents)
967 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
968 smb_file_src, smb_file_target, off, len, destoff);
969 else
970 rc = -EOPNOTSUPP;
971
972 /* force revalidate of size and timestamps of target file now
973 that target is updated on the server */
974 CIFS_I(target_inode)->time = 0;
975 /* although unlocking in the reverse order from locking is not
976 strictly necessary here it is a little cleaner to be consistent */
977 unlock_two_nondirectories(src_inode, target_inode);
978out:
979 free_xid(xid);
980 return rc;
981}
982
983ssize_t cifs_file_copychunk_range(unsigned int xid,
984 struct file *src_file, loff_t off,
985 struct file *dst_file, loff_t destoff,
986 size_t len, unsigned int flags)
987{
988 struct inode *src_inode = file_inode(src_file);
989 struct inode *target_inode = file_inode(dst_file);
990 struct cifsFileInfo *smb_file_src;
991 struct cifsFileInfo *smb_file_target;
992 struct cifs_tcon *src_tcon;
993 struct cifs_tcon *target_tcon;
994 ssize_t rc;
995
996 cifs_dbg(FYI, "copychunk range\n");
997
998 if (src_inode == target_inode) {
999 rc = -EINVAL;
1000 goto out;
1001 }
1002
1003 if (!src_file->private_data || !dst_file->private_data) {
1004 rc = -EBADF;
1005 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1006 goto out;
1007 }
1008
1009 rc = -EXDEV;
1010 smb_file_target = dst_file->private_data;
1011 smb_file_src = src_file->private_data;
1012 src_tcon = tlink_tcon(smb_file_src->tlink);
1013 target_tcon = tlink_tcon(smb_file_target->tlink);
1014
1015 if (src_tcon->ses != target_tcon->ses) {
1016 cifs_dbg(VFS, "source and target of copy not on same server\n");
1017 goto out;
1018 }
1019
1020 /*
1021 * Note: cifs case is easier than btrfs since server responsible for
1022 * checks for proper open modes and file type and if it wants
1023 * server could even support copy of range where source = target
1024 */
1025 lock_two_nondirectories(target_inode, src_inode);
1026
1027 cifs_dbg(FYI, "about to flush pages\n");
1028 /* should we flush first and last page first */
1029 truncate_inode_pages(&target_inode->i_data, 0);
1030
1031 if (target_tcon->ses->server->ops->copychunk_range)
1032 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1033 smb_file_src, smb_file_target, off, len, destoff);
1034 else
1035 rc = -EOPNOTSUPP;
1036
1037 /* force revalidate of size and timestamps of target file now
1038 * that target is updated on the server
1039 */
1040 CIFS_I(target_inode)->time = 0;
1041 /* although unlocking in the reverse order from locking is not
1042 * strictly necessary here it is a little cleaner to be consistent
1043 */
1044 unlock_two_nondirectories(src_inode, target_inode);
1045
1046out:
1047 return rc;
1048}
1049
1050/*
1051 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1052 * is a dummy operation.
1053 */
1054static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1055{
1056 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1057 file, datasync);
1058
1059 return 0;
1060}
1061
1062static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1063 struct file *dst_file, loff_t destoff,
1064 size_t len, unsigned int flags)
1065{
1066 unsigned int xid = get_xid();
1067 ssize_t rc;
1068
1069 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1070 len, flags);
1071 free_xid(xid);
1072 return rc;
1073}
1074
1075const struct file_operations cifs_file_ops = {
1076 .read_iter = cifs_loose_read_iter,
1077 .write_iter = cifs_file_write_iter,
1078 .open = cifs_open,
1079 .release = cifs_close,
1080 .lock = cifs_lock,
1081 .fsync = cifs_fsync,
1082 .flush = cifs_flush,
1083 .mmap = cifs_file_mmap,
1084 .splice_read = generic_file_splice_read,
1085 .splice_write = iter_file_splice_write,
1086 .llseek = cifs_llseek,
1087 .unlocked_ioctl = cifs_ioctl,
1088 .copy_file_range = cifs_copy_file_range,
1089 .clone_file_range = cifs_clone_file_range,
1090 .setlease = cifs_setlease,
1091 .fallocate = cifs_fallocate,
1092};
1093
1094const struct file_operations cifs_file_strict_ops = {
1095 .read_iter = cifs_strict_readv,
1096 .write_iter = cifs_strict_writev,
1097 .open = cifs_open,
1098 .release = cifs_close,
1099 .lock = cifs_lock,
1100 .fsync = cifs_strict_fsync,
1101 .flush = cifs_flush,
1102 .mmap = cifs_file_strict_mmap,
1103 .splice_read = generic_file_splice_read,
1104 .splice_write = iter_file_splice_write,
1105 .llseek = cifs_llseek,
1106 .unlocked_ioctl = cifs_ioctl,
1107 .copy_file_range = cifs_copy_file_range,
1108 .clone_file_range = cifs_clone_file_range,
1109 .setlease = cifs_setlease,
1110 .fallocate = cifs_fallocate,
1111};
1112
1113const struct file_operations cifs_file_direct_ops = {
1114 /* BB reevaluate whether they can be done with directio, no cache */
1115 .read_iter = cifs_user_readv,
1116 .write_iter = cifs_user_writev,
1117 .open = cifs_open,
1118 .release = cifs_close,
1119 .lock = cifs_lock,
1120 .fsync = cifs_fsync,
1121 .flush = cifs_flush,
1122 .mmap = cifs_file_mmap,
1123 .splice_read = generic_file_splice_read,
1124 .splice_write = iter_file_splice_write,
1125 .unlocked_ioctl = cifs_ioctl,
1126 .copy_file_range = cifs_copy_file_range,
1127 .clone_file_range = cifs_clone_file_range,
1128 .llseek = cifs_llseek,
1129 .setlease = cifs_setlease,
1130 .fallocate = cifs_fallocate,
1131};
1132
1133const struct file_operations cifs_file_nobrl_ops = {
1134 .read_iter = cifs_loose_read_iter,
1135 .write_iter = cifs_file_write_iter,
1136 .open = cifs_open,
1137 .release = cifs_close,
1138 .fsync = cifs_fsync,
1139 .flush = cifs_flush,
1140 .mmap = cifs_file_mmap,
1141 .splice_read = generic_file_splice_read,
1142 .splice_write = iter_file_splice_write,
1143 .llseek = cifs_llseek,
1144 .unlocked_ioctl = cifs_ioctl,
1145 .copy_file_range = cifs_copy_file_range,
1146 .clone_file_range = cifs_clone_file_range,
1147 .setlease = cifs_setlease,
1148 .fallocate = cifs_fallocate,
1149};
1150
1151const struct file_operations cifs_file_strict_nobrl_ops = {
1152 .read_iter = cifs_strict_readv,
1153 .write_iter = cifs_strict_writev,
1154 .open = cifs_open,
1155 .release = cifs_close,
1156 .fsync = cifs_strict_fsync,
1157 .flush = cifs_flush,
1158 .mmap = cifs_file_strict_mmap,
1159 .splice_read = generic_file_splice_read,
1160 .splice_write = iter_file_splice_write,
1161 .llseek = cifs_llseek,
1162 .unlocked_ioctl = cifs_ioctl,
1163 .copy_file_range = cifs_copy_file_range,
1164 .clone_file_range = cifs_clone_file_range,
1165 .setlease = cifs_setlease,
1166 .fallocate = cifs_fallocate,
1167};
1168
1169const struct file_operations cifs_file_direct_nobrl_ops = {
1170 /* BB reevaluate whether they can be done with directio, no cache */
1171 .read_iter = cifs_user_readv,
1172 .write_iter = cifs_user_writev,
1173 .open = cifs_open,
1174 .release = cifs_close,
1175 .fsync = cifs_fsync,
1176 .flush = cifs_flush,
1177 .mmap = cifs_file_mmap,
1178 .splice_read = generic_file_splice_read,
1179 .splice_write = iter_file_splice_write,
1180 .unlocked_ioctl = cifs_ioctl,
1181 .copy_file_range = cifs_copy_file_range,
1182 .clone_file_range = cifs_clone_file_range,
1183 .llseek = cifs_llseek,
1184 .setlease = cifs_setlease,
1185 .fallocate = cifs_fallocate,
1186};
1187
1188const struct file_operations cifs_dir_ops = {
1189 .iterate_shared = cifs_readdir,
1190 .release = cifs_closedir,
1191 .read = generic_read_dir,
1192 .unlocked_ioctl = cifs_ioctl,
1193 .copy_file_range = cifs_copy_file_range,
1194 .clone_file_range = cifs_clone_file_range,
1195 .llseek = generic_file_llseek,
1196 .fsync = cifs_dir_fsync,
1197};
1198
1199static void
1200cifs_init_once(void *inode)
1201{
1202 struct cifsInodeInfo *cifsi = inode;
1203
1204 inode_init_once(&cifsi->vfs_inode);
1205 init_rwsem(&cifsi->lock_sem);
1206}
1207
1208static int __init
1209cifs_init_inodecache(void)
1210{
1211 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1212 sizeof(struct cifsInodeInfo),
1213 0, (SLAB_RECLAIM_ACCOUNT|
1214 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1215 cifs_init_once);
1216 if (cifs_inode_cachep == NULL)
1217 return -ENOMEM;
1218
1219 return 0;
1220}
1221
1222static void
1223cifs_destroy_inodecache(void)
1224{
1225 /*
1226 * Make sure all delayed rcu free inodes are flushed before we
1227 * destroy cache.
1228 */
1229 rcu_barrier();
1230 kmem_cache_destroy(cifs_inode_cachep);
1231}
1232
1233static int
1234cifs_init_request_bufs(void)
1235{
1236 /*
1237 * SMB2 maximum header size is bigger than CIFS one - no problems to
1238 * allocate some more bytes for CIFS.
1239 */
1240 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1241
1242 if (CIFSMaxBufSize < 8192) {
1243 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1244 Unicode path name has to fit in any SMB/CIFS path based frames */
1245 CIFSMaxBufSize = 8192;
1246 } else if (CIFSMaxBufSize > 1024*127) {
1247 CIFSMaxBufSize = 1024 * 127;
1248 } else {
1249 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1250 }
1251/*
1252 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1253 CIFSMaxBufSize, CIFSMaxBufSize);
1254*/
1255 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1256 CIFSMaxBufSize + max_hdr_size, 0,
1257 SLAB_HWCACHE_ALIGN, 0,
1258 CIFSMaxBufSize + max_hdr_size,
1259 NULL);
1260 if (cifs_req_cachep == NULL)
1261 return -ENOMEM;
1262
1263 if (cifs_min_rcv < 1)
1264 cifs_min_rcv = 1;
1265 else if (cifs_min_rcv > 64) {
1266 cifs_min_rcv = 64;
1267 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1268 }
1269
1270 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1271 cifs_req_cachep);
1272
1273 if (cifs_req_poolp == NULL) {
1274 kmem_cache_destroy(cifs_req_cachep);
1275 return -ENOMEM;
1276 }
1277 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1278 almost all handle based requests (but not write response, nor is it
1279 sufficient for path based requests). A smaller size would have
1280 been more efficient (compacting multiple slab items on one 4k page)
1281 for the case in which debug was on, but this larger size allows
1282 more SMBs to use small buffer alloc and is still much more
1283 efficient to alloc 1 per page off the slab compared to 17K (5page)
1284 alloc of large cifs buffers even when page debugging is on */
1285 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1286 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1287 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1288 if (cifs_sm_req_cachep == NULL) {
1289 mempool_destroy(cifs_req_poolp);
1290 kmem_cache_destroy(cifs_req_cachep);
1291 return -ENOMEM;
1292 }
1293
1294 if (cifs_min_small < 2)
1295 cifs_min_small = 2;
1296 else if (cifs_min_small > 256) {
1297 cifs_min_small = 256;
1298 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1299 }
1300
1301 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1302 cifs_sm_req_cachep);
1303
1304 if (cifs_sm_req_poolp == NULL) {
1305 mempool_destroy(cifs_req_poolp);
1306 kmem_cache_destroy(cifs_req_cachep);
1307 kmem_cache_destroy(cifs_sm_req_cachep);
1308 return -ENOMEM;
1309 }
1310
1311 return 0;
1312}
1313
1314static void
1315cifs_destroy_request_bufs(void)
1316{
1317 mempool_destroy(cifs_req_poolp);
1318 kmem_cache_destroy(cifs_req_cachep);
1319 mempool_destroy(cifs_sm_req_poolp);
1320 kmem_cache_destroy(cifs_sm_req_cachep);
1321}
1322
1323static int
1324cifs_init_mids(void)
1325{
1326 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1327 sizeof(struct mid_q_entry), 0,
1328 SLAB_HWCACHE_ALIGN, NULL);
1329 if (cifs_mid_cachep == NULL)
1330 return -ENOMEM;
1331
1332 /* 3 is a reasonable minimum number of simultaneous operations */
1333 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1334 if (cifs_mid_poolp == NULL) {
1335 kmem_cache_destroy(cifs_mid_cachep);
1336 return -ENOMEM;
1337 }
1338
1339 return 0;
1340}
1341
1342static void
1343cifs_destroy_mids(void)
1344{
1345 mempool_destroy(cifs_mid_poolp);
1346 kmem_cache_destroy(cifs_mid_cachep);
1347}
1348
1349static int __init
1350init_cifs(void)
1351{
1352 int rc = 0;
1353 cifs_proc_init();
1354 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1355#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1356 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1357 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1358#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1359/*
1360 * Initialize Global counters
1361 */
1362 atomic_set(&sesInfoAllocCount, 0);
1363 atomic_set(&tconInfoAllocCount, 0);
1364 atomic_set(&tcpSesAllocCount, 0);
1365 atomic_set(&tcpSesReconnectCount, 0);
1366 atomic_set(&tconInfoReconnectCount, 0);
1367
1368 atomic_set(&bufAllocCount, 0);
1369 atomic_set(&smBufAllocCount, 0);
1370#ifdef CONFIG_CIFS_STATS2
1371 atomic_set(&totBufAllocCount, 0);
1372 atomic_set(&totSmBufAllocCount, 0);
1373#endif /* CONFIG_CIFS_STATS2 */
1374
1375 atomic_set(&midCount, 0);
1376 GlobalCurrentXid = 0;
1377 GlobalTotalActiveXid = 0;
1378 GlobalMaxActiveXid = 0;
1379 spin_lock_init(&cifs_tcp_ses_lock);
1380 spin_lock_init(&GlobalMid_Lock);
1381
1382 cifs_lock_secret = get_random_u32();
1383
1384 if (cifs_max_pending < 2) {
1385 cifs_max_pending = 2;
1386 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1387 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1388 cifs_max_pending = CIFS_MAX_REQ;
1389 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1390 CIFS_MAX_REQ);
1391 }
1392
1393 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1394 if (!cifsiod_wq) {
1395 rc = -ENOMEM;
1396 goto out_clean_proc;
1397 }
1398
1399 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1400 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1401 if (!cifsoplockd_wq) {
1402 rc = -ENOMEM;
1403 goto out_destroy_cifsiod_wq;
1404 }
1405
1406 rc = cifs_fscache_register();
1407 if (rc)
1408 goto out_destroy_cifsoplockd_wq;
1409
1410 rc = cifs_init_inodecache();
1411 if (rc)
1412 goto out_unreg_fscache;
1413
1414 rc = cifs_init_mids();
1415 if (rc)
1416 goto out_destroy_inodecache;
1417
1418 rc = cifs_init_request_bufs();
1419 if (rc)
1420 goto out_destroy_mids;
1421
1422#ifdef CONFIG_CIFS_UPCALL
1423 rc = init_cifs_spnego();
1424 if (rc)
1425 goto out_destroy_request_bufs;
1426#endif /* CONFIG_CIFS_UPCALL */
1427
1428#ifdef CONFIG_CIFS_ACL
1429 rc = init_cifs_idmap();
1430 if (rc)
1431 goto out_register_key_type;
1432#endif /* CONFIG_CIFS_ACL */
1433
1434 rc = register_filesystem(&cifs_fs_type);
1435 if (rc)
1436 goto out_init_cifs_idmap;
1437
1438 return 0;
1439
1440out_init_cifs_idmap:
1441#ifdef CONFIG_CIFS_ACL
1442 exit_cifs_idmap();
1443out_register_key_type:
1444#endif
1445#ifdef CONFIG_CIFS_UPCALL
1446 exit_cifs_spnego();
1447out_destroy_request_bufs:
1448#endif
1449 cifs_destroy_request_bufs();
1450out_destroy_mids:
1451 cifs_destroy_mids();
1452out_destroy_inodecache:
1453 cifs_destroy_inodecache();
1454out_unreg_fscache:
1455 cifs_fscache_unregister();
1456out_destroy_cifsoplockd_wq:
1457 destroy_workqueue(cifsoplockd_wq);
1458out_destroy_cifsiod_wq:
1459 destroy_workqueue(cifsiod_wq);
1460out_clean_proc:
1461 cifs_proc_clean();
1462 return rc;
1463}
1464
1465static void __exit
1466exit_cifs(void)
1467{
1468 cifs_dbg(NOISY, "exit_cifs\n");
1469 unregister_filesystem(&cifs_fs_type);
1470 cifs_dfs_release_automount_timer();
1471#ifdef CONFIG_CIFS_ACL
1472 exit_cifs_idmap();
1473#endif
1474#ifdef CONFIG_CIFS_UPCALL
1475 exit_cifs_spnego();
1476#endif
1477 cifs_destroy_request_bufs();
1478 cifs_destroy_mids();
1479 cifs_destroy_inodecache();
1480 cifs_fscache_unregister();
1481 destroy_workqueue(cifsoplockd_wq);
1482 destroy_workqueue(cifsiod_wq);
1483 cifs_proc_clean();
1484}
1485
1486MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1487MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1488MODULE_DESCRIPTION
1489 ("VFS to access servers complying with the SNIA CIFS Specification "
1490 "e.g. Samba and Windows");
1491MODULE_VERSION(CIFS_VERSION);
1492MODULE_SOFTDEP("pre: arc4");
1493MODULE_SOFTDEP("pre: des");
1494MODULE_SOFTDEP("pre: ecb");
1495MODULE_SOFTDEP("pre: hmac");
1496MODULE_SOFTDEP("pre: md4");
1497MODULE_SOFTDEP("pre: md5");
1498MODULE_SOFTDEP("pre: nls");
1499MODULE_SOFTDEP("pre: aes");
1500MODULE_SOFTDEP("pre: cmac");
1501MODULE_SOFTDEP("pre: sha256");
1502MODULE_SOFTDEP("pre: sha512");
1503MODULE_SOFTDEP("pre: aead2");
1504MODULE_SOFTDEP("pre: ccm");
1505module_init(init_cifs)
1506module_exit(exit_cifs)