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cifs: make error on lack of a unc= option more explicit
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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 <net/ipv6.h>
41#include "cifsfs.h"
42#include "cifspdu.h"
43#define DECLARE_GLOBALS_HERE
44#include "cifsglob.h"
45#include "cifsproto.h"
46#include "cifs_debug.h"
47#include "cifs_fs_sb.h"
48#include <linux/mm.h>
49#include <linux/key-type.h>
50#include "cifs_spnego.h"
51#include "fscache.h"
52#ifdef CONFIG_CIFS_SMB2
53#include "smb2pdu.h"
54#endif
55
56int cifsFYI = 0;
57int cifsERROR = 1;
58int traceSMB = 0;
59bool enable_oplocks = true;
60unsigned int linuxExtEnabled = 1;
61unsigned int lookupCacheEnabled = 1;
62unsigned int global_secflags = CIFSSEC_DEF;
63/* unsigned int ntlmv2_support = 0; */
64unsigned int sign_CIFS_PDUs = 1;
65static const struct super_operations cifs_super_ops;
66unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
67module_param(CIFSMaxBufSize, uint, 0);
68MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
69 "Default: 16384 Range: 8192 to 130048");
70unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
71module_param(cifs_min_rcv, uint, 0);
72MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
73 "1 to 64");
74unsigned int cifs_min_small = 30;
75module_param(cifs_min_small, uint, 0);
76MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
77 "Range: 2 to 256");
78unsigned int cifs_max_pending = CIFS_MAX_REQ;
79module_param(cifs_max_pending, uint, 0444);
80MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
81 "Default: 32767 Range: 2 to 32767.");
82module_param(enable_oplocks, bool, 0644);
83MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
84
85extern mempool_t *cifs_sm_req_poolp;
86extern mempool_t *cifs_req_poolp;
87extern mempool_t *cifs_mid_poolp;
88
89struct workqueue_struct *cifsiod_wq;
90
91#ifdef CONFIG_CIFS_SMB2
92__u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
93#endif
94
95static int
96cifs_read_super(struct super_block *sb)
97{
98 struct inode *inode;
99 struct cifs_sb_info *cifs_sb;
100 int rc = 0;
101
102 cifs_sb = CIFS_SB(sb);
103
104 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
105 sb->s_flags |= MS_POSIXACL;
106
107 if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
108 sb->s_maxbytes = MAX_LFS_FILESIZE;
109 else
110 sb->s_maxbytes = MAX_NON_LFS;
111
112 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
113 sb->s_time_gran = 100;
114
115 sb->s_magic = CIFS_MAGIC_NUMBER;
116 sb->s_op = &cifs_super_ops;
117 sb->s_bdi = &cifs_sb->bdi;
118 sb->s_blocksize = CIFS_MAX_MSGSIZE;
119 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
120 inode = cifs_root_iget(sb);
121
122 if (IS_ERR(inode)) {
123 rc = PTR_ERR(inode);
124 goto out_no_root;
125 }
126
127 sb->s_root = d_make_root(inode);
128 if (!sb->s_root) {
129 rc = -ENOMEM;
130 goto out_no_root;
131 }
132
133 /* do that *after* d_make_root() - we want NULL ->d_op for root here */
134 if (cifs_sb_master_tcon(cifs_sb)->nocase)
135 sb->s_d_op = &cifs_ci_dentry_ops;
136 else
137 sb->s_d_op = &cifs_dentry_ops;
138
139#ifdef CONFIG_CIFS_NFSD_EXPORT
140 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
141 cFYI(1, "export ops supported");
142 sb->s_export_op = &cifs_export_ops;
143 }
144#endif /* CONFIG_CIFS_NFSD_EXPORT */
145
146 return 0;
147
148out_no_root:
149 cERROR(1, "cifs_read_super: get root inode failed");
150 return rc;
151}
152
153static void cifs_kill_sb(struct super_block *sb)
154{
155 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
156 kill_anon_super(sb);
157 cifs_umount(cifs_sb);
158}
159
160static int
161cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
162{
163 struct super_block *sb = dentry->d_sb;
164 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
165 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
166 struct TCP_Server_Info *server = tcon->ses->server;
167 unsigned int xid;
168 int rc = 0;
169
170 xid = get_xid();
171
172 /*
173 * PATH_MAX may be too long - it would presumably be total path,
174 * but note that some servers (includinng Samba 3) have a shorter
175 * maximum path.
176 *
177 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
178 */
179 buf->f_namelen = PATH_MAX;
180 buf->f_files = 0; /* undefined */
181 buf->f_ffree = 0; /* unlimited */
182
183 if (server->ops->queryfs)
184 rc = server->ops->queryfs(xid, tcon, buf);
185
186 free_xid(xid);
187 return 0;
188}
189
190static int cifs_permission(struct inode *inode, int mask)
191{
192 struct cifs_sb_info *cifs_sb;
193
194 cifs_sb = CIFS_SB(inode->i_sb);
195
196 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
197 if ((mask & MAY_EXEC) && !execute_ok(inode))
198 return -EACCES;
199 else
200 return 0;
201 } else /* file mode might have been restricted at mount time
202 on the client (above and beyond ACL on servers) for
203 servers which do not support setting and viewing mode bits,
204 so allowing client to check permissions is useful */
205 return generic_permission(inode, mask);
206}
207
208static struct kmem_cache *cifs_inode_cachep;
209static struct kmem_cache *cifs_req_cachep;
210static struct kmem_cache *cifs_mid_cachep;
211static struct kmem_cache *cifs_sm_req_cachep;
212mempool_t *cifs_sm_req_poolp;
213mempool_t *cifs_req_poolp;
214mempool_t *cifs_mid_poolp;
215
216static struct inode *
217cifs_alloc_inode(struct super_block *sb)
218{
219 struct cifsInodeInfo *cifs_inode;
220 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
221 if (!cifs_inode)
222 return NULL;
223 cifs_inode->cifsAttrs = 0x20; /* default */
224 cifs_inode->time = 0;
225 /*
226 * Until the file is open and we have gotten oplock info back from the
227 * server, can not assume caching of file data or metadata.
228 */
229 cifs_set_oplock_level(cifs_inode, 0);
230 cifs_inode->delete_pending = false;
231 cifs_inode->invalid_mapping = false;
232 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
233 cifs_inode->server_eof = 0;
234 cifs_inode->uniqueid = 0;
235 cifs_inode->createtime = 0;
236#ifdef CONFIG_CIFS_SMB2
237 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
238#endif
239 /*
240 * Can not set i_flags here - they get immediately overwritten to zero
241 * by the VFS.
242 */
243 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
244 INIT_LIST_HEAD(&cifs_inode->openFileList);
245 INIT_LIST_HEAD(&cifs_inode->llist);
246 return &cifs_inode->vfs_inode;
247}
248
249static void cifs_i_callback(struct rcu_head *head)
250{
251 struct inode *inode = container_of(head, struct inode, i_rcu);
252 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
253}
254
255static void
256cifs_destroy_inode(struct inode *inode)
257{
258 call_rcu(&inode->i_rcu, cifs_i_callback);
259}
260
261static void
262cifs_evict_inode(struct inode *inode)
263{
264 truncate_inode_pages(&inode->i_data, 0);
265 clear_inode(inode);
266 cifs_fscache_release_inode_cookie(inode);
267}
268
269static void
270cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
271{
272 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
273 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
274
275 seq_printf(s, ",addr=");
276
277 switch (server->dstaddr.ss_family) {
278 case AF_INET:
279 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
280 break;
281 case AF_INET6:
282 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
283 if (sa6->sin6_scope_id)
284 seq_printf(s, "%%%u", sa6->sin6_scope_id);
285 break;
286 default:
287 seq_printf(s, "(unknown)");
288 }
289}
290
291static void
292cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
293{
294 seq_printf(s, ",sec=");
295
296 switch (server->secType) {
297 case LANMAN:
298 seq_printf(s, "lanman");
299 break;
300 case NTLMv2:
301 seq_printf(s, "ntlmv2");
302 break;
303 case NTLM:
304 seq_printf(s, "ntlm");
305 break;
306 case Kerberos:
307 seq_printf(s, "krb5");
308 break;
309 case RawNTLMSSP:
310 seq_printf(s, "ntlmssp");
311 break;
312 default:
313 /* shouldn't ever happen */
314 seq_printf(s, "unknown");
315 break;
316 }
317
318 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
319 seq_printf(s, "i");
320}
321
322static void
323cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
324{
325 seq_printf(s, ",cache=");
326
327 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
328 seq_printf(s, "strict");
329 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
330 seq_printf(s, "none");
331 else
332 seq_printf(s, "loose");
333}
334
335/*
336 * cifs_show_options() is for displaying mount options in /proc/mounts.
337 * Not all settable options are displayed but most of the important
338 * ones are.
339 */
340static int
341cifs_show_options(struct seq_file *s, struct dentry *root)
342{
343 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
344 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
345 struct sockaddr *srcaddr;
346 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
347
348 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
349 cifs_show_security(s, tcon->ses->server);
350 cifs_show_cache_flavor(s, cifs_sb);
351
352 seq_printf(s, ",unc=");
353 seq_escape(s, tcon->treeName, " \t\n\\");
354
355 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
356 seq_printf(s, ",multiuser");
357 else if (tcon->ses->user_name)
358 seq_printf(s, ",username=%s", tcon->ses->user_name);
359
360 if (tcon->ses->domainName)
361 seq_printf(s, ",domain=%s", tcon->ses->domainName);
362
363 if (srcaddr->sa_family != AF_UNSPEC) {
364 struct sockaddr_in *saddr4;
365 struct sockaddr_in6 *saddr6;
366 saddr4 = (struct sockaddr_in *)srcaddr;
367 saddr6 = (struct sockaddr_in6 *)srcaddr;
368 if (srcaddr->sa_family == AF_INET6)
369 seq_printf(s, ",srcaddr=%pI6c",
370 &saddr6->sin6_addr);
371 else if (srcaddr->sa_family == AF_INET)
372 seq_printf(s, ",srcaddr=%pI4",
373 &saddr4->sin_addr.s_addr);
374 else
375 seq_printf(s, ",srcaddr=BAD-AF:%i",
376 (int)(srcaddr->sa_family));
377 }
378
379 seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
380 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
381 seq_printf(s, ",forceuid");
382 else
383 seq_printf(s, ",noforceuid");
384
385 seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
387 seq_printf(s, ",forcegid");
388 else
389 seq_printf(s, ",noforcegid");
390
391 cifs_show_address(s, tcon->ses->server);
392
393 if (!tcon->unix_ext)
394 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
395 cifs_sb->mnt_file_mode,
396 cifs_sb->mnt_dir_mode);
397 if (tcon->seal)
398 seq_printf(s, ",seal");
399 if (tcon->nocase)
400 seq_printf(s, ",nocase");
401 if (tcon->retry)
402 seq_printf(s, ",hard");
403 if (tcon->unix_ext)
404 seq_printf(s, ",unix");
405 else
406 seq_printf(s, ",nounix");
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
408 seq_printf(s, ",posixpaths");
409 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
410 seq_printf(s, ",setuids");
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
412 seq_printf(s, ",serverino");
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
414 seq_printf(s, ",rwpidforward");
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
416 seq_printf(s, ",forcemand");
417 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
418 seq_printf(s, ",nouser_xattr");
419 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
420 seq_printf(s, ",mapchars");
421 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
422 seq_printf(s, ",sfu");
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
424 seq_printf(s, ",nobrl");
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
426 seq_printf(s, ",cifsacl");
427 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
428 seq_printf(s, ",dynperm");
429 if (root->d_sb->s_flags & MS_POSIXACL)
430 seq_printf(s, ",acl");
431 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
432 seq_printf(s, ",mfsymlinks");
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
434 seq_printf(s, ",fsc");
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
436 seq_printf(s, ",nostrictsync");
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
438 seq_printf(s, ",noperm");
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
440 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
442 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
443
444 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
445 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
446 /* convert actimeo and display it in seconds */
447 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
448
449 return 0;
450}
451
452static void cifs_umount_begin(struct super_block *sb)
453{
454 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
455 struct cifs_tcon *tcon;
456
457 if (cifs_sb == NULL)
458 return;
459
460 tcon = cifs_sb_master_tcon(cifs_sb);
461
462 spin_lock(&cifs_tcp_ses_lock);
463 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
464 /* we have other mounts to same share or we have
465 already tried to force umount this and woken up
466 all waiting network requests, nothing to do */
467 spin_unlock(&cifs_tcp_ses_lock);
468 return;
469 } else if (tcon->tc_count == 1)
470 tcon->tidStatus = CifsExiting;
471 spin_unlock(&cifs_tcp_ses_lock);
472
473 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
474 /* cancel_notify_requests(tcon); */
475 if (tcon->ses && tcon->ses->server) {
476 cFYI(1, "wake up tasks now - umount begin not complete");
477 wake_up_all(&tcon->ses->server->request_q);
478 wake_up_all(&tcon->ses->server->response_q);
479 msleep(1); /* yield */
480 /* we have to kick the requests once more */
481 wake_up_all(&tcon->ses->server->response_q);
482 msleep(1);
483 }
484
485 return;
486}
487
488#ifdef CONFIG_CIFS_STATS2
489static int cifs_show_stats(struct seq_file *s, struct dentry *root)
490{
491 /* BB FIXME */
492 return 0;
493}
494#endif
495
496static int cifs_remount(struct super_block *sb, int *flags, char *data)
497{
498 *flags |= MS_NODIRATIME;
499 return 0;
500}
501
502static int cifs_drop_inode(struct inode *inode)
503{
504 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
505
506 /* no serverino => unconditional eviction */
507 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
508 generic_drop_inode(inode);
509}
510
511static const struct super_operations cifs_super_ops = {
512 .statfs = cifs_statfs,
513 .alloc_inode = cifs_alloc_inode,
514 .destroy_inode = cifs_destroy_inode,
515 .drop_inode = cifs_drop_inode,
516 .evict_inode = cifs_evict_inode,
517/* .delete_inode = cifs_delete_inode, */ /* Do not need above
518 function unless later we add lazy close of inodes or unless the
519 kernel forgets to call us with the same number of releases (closes)
520 as opens */
521 .show_options = cifs_show_options,
522 .umount_begin = cifs_umount_begin,
523 .remount_fs = cifs_remount,
524#ifdef CONFIG_CIFS_STATS2
525 .show_stats = cifs_show_stats,
526#endif
527};
528
529/*
530 * Get root dentry from superblock according to prefix path mount option.
531 * Return dentry with refcount + 1 on success and NULL otherwise.
532 */
533static struct dentry *
534cifs_get_root(struct smb_vol *vol, struct super_block *sb)
535{
536 struct dentry *dentry;
537 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
538 char *full_path = NULL;
539 char *s, *p;
540 char sep;
541
542 full_path = build_path_to_root(vol, cifs_sb,
543 cifs_sb_master_tcon(cifs_sb));
544 if (full_path == NULL)
545 return ERR_PTR(-ENOMEM);
546
547 cFYI(1, "Get root dentry for %s", full_path);
548
549 sep = CIFS_DIR_SEP(cifs_sb);
550 dentry = dget(sb->s_root);
551 p = s = full_path;
552
553 do {
554 struct inode *dir = dentry->d_inode;
555 struct dentry *child;
556
557 if (!dir) {
558 dput(dentry);
559 dentry = ERR_PTR(-ENOENT);
560 break;
561 }
562
563 /* skip separators */
564 while (*s == sep)
565 s++;
566 if (!*s)
567 break;
568 p = s++;
569 /* next separator */
570 while (*s && *s != sep)
571 s++;
572
573 mutex_lock(&dir->i_mutex);
574 child = lookup_one_len(p, dentry, s - p);
575 mutex_unlock(&dir->i_mutex);
576 dput(dentry);
577 dentry = child;
578 } while (!IS_ERR(dentry));
579 kfree(full_path);
580 return dentry;
581}
582
583static int cifs_set_super(struct super_block *sb, void *data)
584{
585 struct cifs_mnt_data *mnt_data = data;
586 sb->s_fs_info = mnt_data->cifs_sb;
587 return set_anon_super(sb, NULL);
588}
589
590static struct dentry *
591cifs_do_mount(struct file_system_type *fs_type,
592 int flags, const char *dev_name, void *data)
593{
594 int rc;
595 struct super_block *sb;
596 struct cifs_sb_info *cifs_sb;
597 struct smb_vol *volume_info;
598 struct cifs_mnt_data mnt_data;
599 struct dentry *root;
600
601 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
602
603 volume_info = cifs_get_volume_info((char *)data, dev_name);
604 if (IS_ERR(volume_info))
605 return ERR_CAST(volume_info);
606
607 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
608 if (cifs_sb == NULL) {
609 root = ERR_PTR(-ENOMEM);
610 goto out_nls;
611 }
612
613 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
614 if (cifs_sb->mountdata == NULL) {
615 root = ERR_PTR(-ENOMEM);
616 goto out_cifs_sb;
617 }
618
619 cifs_setup_cifs_sb(volume_info, cifs_sb);
620
621 rc = cifs_mount(cifs_sb, volume_info);
622 if (rc) {
623 if (!(flags & MS_SILENT))
624 cERROR(1, "cifs_mount failed w/return code = %d", rc);
625 root = ERR_PTR(rc);
626 goto out_mountdata;
627 }
628
629 mnt_data.vol = volume_info;
630 mnt_data.cifs_sb = cifs_sb;
631 mnt_data.flags = flags;
632
633 /* BB should we make this contingent on mount parm? */
634 flags |= MS_NODIRATIME | MS_NOATIME;
635
636 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
637 if (IS_ERR(sb)) {
638 root = ERR_CAST(sb);
639 cifs_umount(cifs_sb);
640 goto out;
641 }
642
643 if (sb->s_root) {
644 cFYI(1, "Use existing superblock");
645 cifs_umount(cifs_sb);
646 } else {
647 rc = cifs_read_super(sb);
648 if (rc) {
649 root = ERR_PTR(rc);
650 goto out_super;
651 }
652
653 sb->s_flags |= MS_ACTIVE;
654 }
655
656 root = cifs_get_root(volume_info, sb);
657 if (IS_ERR(root))
658 goto out_super;
659
660 cFYI(1, "dentry root is: %p", root);
661 goto out;
662
663out_super:
664 deactivate_locked_super(sb);
665out:
666 cifs_cleanup_volume_info(volume_info);
667 return root;
668
669out_mountdata:
670 kfree(cifs_sb->mountdata);
671out_cifs_sb:
672 kfree(cifs_sb);
673out_nls:
674 unload_nls(volume_info->local_nls);
675 goto out;
676}
677
678static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
679 unsigned long nr_segs, loff_t pos)
680{
681 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
682 ssize_t written;
683 int rc;
684
685 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
686
687 if (CIFS_I(inode)->clientCanCacheAll)
688 return written;
689
690 rc = filemap_fdatawrite(inode->i_mapping);
691 if (rc)
692 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
693
694 return written;
695}
696
697static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
698{
699 /*
700 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
701 * the cached file length
702 */
703 if (origin != SEEK_SET && origin != SEEK_CUR) {
704 int rc;
705 struct inode *inode = file->f_path.dentry->d_inode;
706
707 /*
708 * We need to be sure that all dirty pages are written and the
709 * server has the newest file length.
710 */
711 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
712 inode->i_mapping->nrpages != 0) {
713 rc = filemap_fdatawait(inode->i_mapping);
714 if (rc) {
715 mapping_set_error(inode->i_mapping, rc);
716 return rc;
717 }
718 }
719 /*
720 * Some applications poll for the file length in this strange
721 * way so we must seek to end on non-oplocked files by
722 * setting the revalidate time to zero.
723 */
724 CIFS_I(inode)->time = 0;
725
726 rc = cifs_revalidate_file_attr(file);
727 if (rc < 0)
728 return (loff_t)rc;
729 }
730 return generic_file_llseek(file, offset, origin);
731}
732
733static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
734{
735 /* note that this is called by vfs setlease with lock_flocks held
736 to protect *lease from going away */
737 struct inode *inode = file->f_path.dentry->d_inode;
738 struct cifsFileInfo *cfile = file->private_data;
739
740 if (!(S_ISREG(inode->i_mode)))
741 return -EINVAL;
742
743 /* check if file is oplocked */
744 if (((arg == F_RDLCK) &&
745 (CIFS_I(inode)->clientCanCacheRead)) ||
746 ((arg == F_WRLCK) &&
747 (CIFS_I(inode)->clientCanCacheAll)))
748 return generic_setlease(file, arg, lease);
749 else if (tlink_tcon(cfile->tlink)->local_lease &&
750 !CIFS_I(inode)->clientCanCacheRead)
751 /* If the server claims to support oplock on this
752 file, then we still need to check oplock even
753 if the local_lease mount option is set, but there
754 are servers which do not support oplock for which
755 this mount option may be useful if the user
756 knows that the file won't be changed on the server
757 by anyone else */
758 return generic_setlease(file, arg, lease);
759 else
760 return -EAGAIN;
761}
762
763struct file_system_type cifs_fs_type = {
764 .owner = THIS_MODULE,
765 .name = "cifs",
766 .mount = cifs_do_mount,
767 .kill_sb = cifs_kill_sb,
768 /* .fs_flags */
769};
770const struct inode_operations cifs_dir_inode_ops = {
771 .create = cifs_create,
772 .atomic_open = cifs_atomic_open,
773 .lookup = cifs_lookup,
774 .getattr = cifs_getattr,
775 .unlink = cifs_unlink,
776 .link = cifs_hardlink,
777 .mkdir = cifs_mkdir,
778 .rmdir = cifs_rmdir,
779 .rename = cifs_rename,
780 .permission = cifs_permission,
781/* revalidate:cifs_revalidate, */
782 .setattr = cifs_setattr,
783 .symlink = cifs_symlink,
784 .mknod = cifs_mknod,
785#ifdef CONFIG_CIFS_XATTR
786 .setxattr = cifs_setxattr,
787 .getxattr = cifs_getxattr,
788 .listxattr = cifs_listxattr,
789 .removexattr = cifs_removexattr,
790#endif
791};
792
793const struct inode_operations cifs_file_inode_ops = {
794/* revalidate:cifs_revalidate, */
795 .setattr = cifs_setattr,
796 .getattr = cifs_getattr, /* do we need this anymore? */
797 .rename = cifs_rename,
798 .permission = cifs_permission,
799#ifdef CONFIG_CIFS_XATTR
800 .setxattr = cifs_setxattr,
801 .getxattr = cifs_getxattr,
802 .listxattr = cifs_listxattr,
803 .removexattr = cifs_removexattr,
804#endif
805};
806
807const struct inode_operations cifs_symlink_inode_ops = {
808 .readlink = generic_readlink,
809 .follow_link = cifs_follow_link,
810 .put_link = cifs_put_link,
811 .permission = cifs_permission,
812 /* BB add the following two eventually */
813 /* revalidate: cifs_revalidate,
814 setattr: cifs_notify_change, *//* BB do we need notify change */
815#ifdef CONFIG_CIFS_XATTR
816 .setxattr = cifs_setxattr,
817 .getxattr = cifs_getxattr,
818 .listxattr = cifs_listxattr,
819 .removexattr = cifs_removexattr,
820#endif
821};
822
823const struct file_operations cifs_file_ops = {
824 .read = do_sync_read,
825 .write = do_sync_write,
826 .aio_read = generic_file_aio_read,
827 .aio_write = cifs_file_aio_write,
828 .open = cifs_open,
829 .release = cifs_close,
830 .lock = cifs_lock,
831 .fsync = cifs_fsync,
832 .flush = cifs_flush,
833 .mmap = cifs_file_mmap,
834 .splice_read = generic_file_splice_read,
835 .llseek = cifs_llseek,
836#ifdef CONFIG_CIFS_POSIX
837 .unlocked_ioctl = cifs_ioctl,
838#endif /* CONFIG_CIFS_POSIX */
839 .setlease = cifs_setlease,
840};
841
842const struct file_operations cifs_file_strict_ops = {
843 .read = do_sync_read,
844 .write = do_sync_write,
845 .aio_read = cifs_strict_readv,
846 .aio_write = cifs_strict_writev,
847 .open = cifs_open,
848 .release = cifs_close,
849 .lock = cifs_lock,
850 .fsync = cifs_strict_fsync,
851 .flush = cifs_flush,
852 .mmap = cifs_file_strict_mmap,
853 .splice_read = generic_file_splice_read,
854 .llseek = cifs_llseek,
855#ifdef CONFIG_CIFS_POSIX
856 .unlocked_ioctl = cifs_ioctl,
857#endif /* CONFIG_CIFS_POSIX */
858 .setlease = cifs_setlease,
859};
860
861const struct file_operations cifs_file_direct_ops = {
862 /* BB reevaluate whether they can be done with directio, no cache */
863 .read = do_sync_read,
864 .write = do_sync_write,
865 .aio_read = cifs_user_readv,
866 .aio_write = cifs_user_writev,
867 .open = cifs_open,
868 .release = cifs_close,
869 .lock = cifs_lock,
870 .fsync = cifs_fsync,
871 .flush = cifs_flush,
872 .mmap = cifs_file_mmap,
873 .splice_read = generic_file_splice_read,
874#ifdef CONFIG_CIFS_POSIX
875 .unlocked_ioctl = cifs_ioctl,
876#endif /* CONFIG_CIFS_POSIX */
877 .llseek = cifs_llseek,
878 .setlease = cifs_setlease,
879};
880
881const struct file_operations cifs_file_nobrl_ops = {
882 .read = do_sync_read,
883 .write = do_sync_write,
884 .aio_read = generic_file_aio_read,
885 .aio_write = cifs_file_aio_write,
886 .open = cifs_open,
887 .release = cifs_close,
888 .fsync = cifs_fsync,
889 .flush = cifs_flush,
890 .mmap = cifs_file_mmap,
891 .splice_read = generic_file_splice_read,
892 .llseek = cifs_llseek,
893#ifdef CONFIG_CIFS_POSIX
894 .unlocked_ioctl = cifs_ioctl,
895#endif /* CONFIG_CIFS_POSIX */
896 .setlease = cifs_setlease,
897};
898
899const struct file_operations cifs_file_strict_nobrl_ops = {
900 .read = do_sync_read,
901 .write = do_sync_write,
902 .aio_read = cifs_strict_readv,
903 .aio_write = cifs_strict_writev,
904 .open = cifs_open,
905 .release = cifs_close,
906 .fsync = cifs_strict_fsync,
907 .flush = cifs_flush,
908 .mmap = cifs_file_strict_mmap,
909 .splice_read = generic_file_splice_read,
910 .llseek = cifs_llseek,
911#ifdef CONFIG_CIFS_POSIX
912 .unlocked_ioctl = cifs_ioctl,
913#endif /* CONFIG_CIFS_POSIX */
914 .setlease = cifs_setlease,
915};
916
917const struct file_operations cifs_file_direct_nobrl_ops = {
918 /* BB reevaluate whether they can be done with directio, no cache */
919 .read = do_sync_read,
920 .write = do_sync_write,
921 .aio_read = cifs_user_readv,
922 .aio_write = cifs_user_writev,
923 .open = cifs_open,
924 .release = cifs_close,
925 .fsync = cifs_fsync,
926 .flush = cifs_flush,
927 .mmap = cifs_file_mmap,
928 .splice_read = generic_file_splice_read,
929#ifdef CONFIG_CIFS_POSIX
930 .unlocked_ioctl = cifs_ioctl,
931#endif /* CONFIG_CIFS_POSIX */
932 .llseek = cifs_llseek,
933 .setlease = cifs_setlease,
934};
935
936const struct file_operations cifs_dir_ops = {
937 .readdir = cifs_readdir,
938 .release = cifs_closedir,
939 .read = generic_read_dir,
940 .unlocked_ioctl = cifs_ioctl,
941 .llseek = generic_file_llseek,
942};
943
944static void
945cifs_init_once(void *inode)
946{
947 struct cifsInodeInfo *cifsi = inode;
948
949 inode_init_once(&cifsi->vfs_inode);
950 init_rwsem(&cifsi->lock_sem);
951}
952
953static int
954cifs_init_inodecache(void)
955{
956 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
957 sizeof(struct cifsInodeInfo),
958 0, (SLAB_RECLAIM_ACCOUNT|
959 SLAB_MEM_SPREAD),
960 cifs_init_once);
961 if (cifs_inode_cachep == NULL)
962 return -ENOMEM;
963
964 return 0;
965}
966
967static void
968cifs_destroy_inodecache(void)
969{
970 /*
971 * Make sure all delayed rcu free inodes are flushed before we
972 * destroy cache.
973 */
974 rcu_barrier();
975 kmem_cache_destroy(cifs_inode_cachep);
976}
977
978static int
979cifs_init_request_bufs(void)
980{
981 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
982#ifdef CONFIG_CIFS_SMB2
983 /*
984 * SMB2 maximum header size is bigger than CIFS one - no problems to
985 * allocate some more bytes for CIFS.
986 */
987 max_hdr_size = MAX_SMB2_HDR_SIZE;
988#endif
989 if (CIFSMaxBufSize < 8192) {
990 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
991 Unicode path name has to fit in any SMB/CIFS path based frames */
992 CIFSMaxBufSize = 8192;
993 } else if (CIFSMaxBufSize > 1024*127) {
994 CIFSMaxBufSize = 1024 * 127;
995 } else {
996 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
997 }
998/* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
999 cifs_req_cachep = kmem_cache_create("cifs_request",
1000 CIFSMaxBufSize + max_hdr_size, 0,
1001 SLAB_HWCACHE_ALIGN, NULL);
1002 if (cifs_req_cachep == NULL)
1003 return -ENOMEM;
1004
1005 if (cifs_min_rcv < 1)
1006 cifs_min_rcv = 1;
1007 else if (cifs_min_rcv > 64) {
1008 cifs_min_rcv = 64;
1009 cERROR(1, "cifs_min_rcv set to maximum (64)");
1010 }
1011
1012 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1013 cifs_req_cachep);
1014
1015 if (cifs_req_poolp == NULL) {
1016 kmem_cache_destroy(cifs_req_cachep);
1017 return -ENOMEM;
1018 }
1019 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1020 almost all handle based requests (but not write response, nor is it
1021 sufficient for path based requests). A smaller size would have
1022 been more efficient (compacting multiple slab items on one 4k page)
1023 for the case in which debug was on, but this larger size allows
1024 more SMBs to use small buffer alloc and is still much more
1025 efficient to alloc 1 per page off the slab compared to 17K (5page)
1026 alloc of large cifs buffers even when page debugging is on */
1027 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1028 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1029 NULL);
1030 if (cifs_sm_req_cachep == NULL) {
1031 mempool_destroy(cifs_req_poolp);
1032 kmem_cache_destroy(cifs_req_cachep);
1033 return -ENOMEM;
1034 }
1035
1036 if (cifs_min_small < 2)
1037 cifs_min_small = 2;
1038 else if (cifs_min_small > 256) {
1039 cifs_min_small = 256;
1040 cFYI(1, "cifs_min_small set to maximum (256)");
1041 }
1042
1043 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1044 cifs_sm_req_cachep);
1045
1046 if (cifs_sm_req_poolp == NULL) {
1047 mempool_destroy(cifs_req_poolp);
1048 kmem_cache_destroy(cifs_req_cachep);
1049 kmem_cache_destroy(cifs_sm_req_cachep);
1050 return -ENOMEM;
1051 }
1052
1053 return 0;
1054}
1055
1056static void
1057cifs_destroy_request_bufs(void)
1058{
1059 mempool_destroy(cifs_req_poolp);
1060 kmem_cache_destroy(cifs_req_cachep);
1061 mempool_destroy(cifs_sm_req_poolp);
1062 kmem_cache_destroy(cifs_sm_req_cachep);
1063}
1064
1065static int
1066cifs_init_mids(void)
1067{
1068 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1069 sizeof(struct mid_q_entry), 0,
1070 SLAB_HWCACHE_ALIGN, NULL);
1071 if (cifs_mid_cachep == NULL)
1072 return -ENOMEM;
1073
1074 /* 3 is a reasonable minimum number of simultaneous operations */
1075 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1076 if (cifs_mid_poolp == NULL) {
1077 kmem_cache_destroy(cifs_mid_cachep);
1078 return -ENOMEM;
1079 }
1080
1081 return 0;
1082}
1083
1084static void
1085cifs_destroy_mids(void)
1086{
1087 mempool_destroy(cifs_mid_poolp);
1088 kmem_cache_destroy(cifs_mid_cachep);
1089}
1090
1091static int __init
1092init_cifs(void)
1093{
1094 int rc = 0;
1095 cifs_proc_init();
1096 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1097#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1098 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1099 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1100#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1101/*
1102 * Initialize Global counters
1103 */
1104 atomic_set(&sesInfoAllocCount, 0);
1105 atomic_set(&tconInfoAllocCount, 0);
1106 atomic_set(&tcpSesAllocCount, 0);
1107 atomic_set(&tcpSesReconnectCount, 0);
1108 atomic_set(&tconInfoReconnectCount, 0);
1109
1110 atomic_set(&bufAllocCount, 0);
1111 atomic_set(&smBufAllocCount, 0);
1112#ifdef CONFIG_CIFS_STATS2
1113 atomic_set(&totBufAllocCount, 0);
1114 atomic_set(&totSmBufAllocCount, 0);
1115#endif /* CONFIG_CIFS_STATS2 */
1116
1117 atomic_set(&midCount, 0);
1118 GlobalCurrentXid = 0;
1119 GlobalTotalActiveXid = 0;
1120 GlobalMaxActiveXid = 0;
1121 spin_lock_init(&cifs_tcp_ses_lock);
1122 spin_lock_init(&cifs_file_list_lock);
1123 spin_lock_init(&GlobalMid_Lock);
1124
1125#ifdef CONFIG_CIFS_SMB2
1126 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1127#endif
1128
1129 if (cifs_max_pending < 2) {
1130 cifs_max_pending = 2;
1131 cFYI(1, "cifs_max_pending set to min of 2");
1132 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1133 cifs_max_pending = CIFS_MAX_REQ;
1134 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1135 }
1136
1137 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1138 if (!cifsiod_wq) {
1139 rc = -ENOMEM;
1140 goto out_clean_proc;
1141 }
1142
1143 rc = cifs_fscache_register();
1144 if (rc)
1145 goto out_destroy_wq;
1146
1147 rc = cifs_init_inodecache();
1148 if (rc)
1149 goto out_unreg_fscache;
1150
1151 rc = cifs_init_mids();
1152 if (rc)
1153 goto out_destroy_inodecache;
1154
1155 rc = cifs_init_request_bufs();
1156 if (rc)
1157 goto out_destroy_mids;
1158
1159#ifdef CONFIG_CIFS_UPCALL
1160 rc = register_key_type(&cifs_spnego_key_type);
1161 if (rc)
1162 goto out_destroy_request_bufs;
1163#endif /* CONFIG_CIFS_UPCALL */
1164
1165#ifdef CONFIG_CIFS_ACL
1166 rc = init_cifs_idmap();
1167 if (rc)
1168 goto out_register_key_type;
1169#endif /* CONFIG_CIFS_ACL */
1170
1171 rc = register_filesystem(&cifs_fs_type);
1172 if (rc)
1173 goto out_init_cifs_idmap;
1174
1175 return 0;
1176
1177out_init_cifs_idmap:
1178#ifdef CONFIG_CIFS_ACL
1179 exit_cifs_idmap();
1180out_register_key_type:
1181#endif
1182#ifdef CONFIG_CIFS_UPCALL
1183 unregister_key_type(&cifs_spnego_key_type);
1184out_destroy_request_bufs:
1185#endif
1186 cifs_destroy_request_bufs();
1187out_destroy_mids:
1188 cifs_destroy_mids();
1189out_destroy_inodecache:
1190 cifs_destroy_inodecache();
1191out_unreg_fscache:
1192 cifs_fscache_unregister();
1193out_destroy_wq:
1194 destroy_workqueue(cifsiod_wq);
1195out_clean_proc:
1196 cifs_proc_clean();
1197 return rc;
1198}
1199
1200static void __exit
1201exit_cifs(void)
1202{
1203 cFYI(DBG2, "exit_cifs");
1204 unregister_filesystem(&cifs_fs_type);
1205 cifs_dfs_release_automount_timer();
1206#ifdef CONFIG_CIFS_ACL
1207 cifs_destroy_idmaptrees();
1208 exit_cifs_idmap();
1209#endif
1210#ifdef CONFIG_CIFS_UPCALL
1211 unregister_key_type(&cifs_spnego_key_type);
1212#endif
1213 cifs_destroy_request_bufs();
1214 cifs_destroy_mids();
1215 cifs_destroy_inodecache();
1216 cifs_fscache_unregister();
1217 destroy_workqueue(cifsiod_wq);
1218 cifs_proc_clean();
1219}
1220
1221MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1222MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1223MODULE_DESCRIPTION
1224 ("VFS to access servers complying with the SNIA CIFS Specification "
1225 "e.g. Samba and Windows");
1226MODULE_VERSION(CIFS_VERSION);
1227module_init(init_cifs)
1228module_exit(exit_cifs)
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