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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 <net/ipv6.h> | |
40 | #include "cifsfs.h" | |
41 | #include "cifspdu.h" | |
42 | #define DECLARE_GLOBALS_HERE | |
43 | #include "cifsglob.h" | |
44 | #include "cifsproto.h" | |
45 | #include "cifs_debug.h" | |
46 | #include "cifs_fs_sb.h" | |
47 | #include <linux/mm.h> | |
48 | #include <linux/key-type.h> | |
49 | #include "cifs_spnego.h" | |
50 | #include "fscache.h" | |
51 | #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */ | |
52 | ||
53 | int cifsFYI = 0; | |
54 | int cifsERROR = 1; | |
55 | int traceSMB = 0; | |
56 | bool enable_oplocks = true; | |
57 | unsigned int linuxExtEnabled = 1; | |
58 | unsigned int lookupCacheEnabled = 1; | |
59 | unsigned int multiuser_mount = 0; | |
60 | unsigned int global_secflags = CIFSSEC_DEF; | |
61 | /* unsigned int ntlmv2_support = 0; */ | |
62 | unsigned int sign_CIFS_PDUs = 1; | |
63 | static const struct super_operations cifs_super_ops; | |
64 | unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; | |
65 | module_param(CIFSMaxBufSize, int, 0); | |
66 | MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). " | |
67 | "Default: 16384 Range: 8192 to 130048"); | |
68 | unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; | |
69 | module_param(cifs_min_rcv, int, 0); | |
70 | MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: " | |
71 | "1 to 64"); | |
72 | unsigned int cifs_min_small = 30; | |
73 | module_param(cifs_min_small, int, 0); | |
74 | MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 " | |
75 | "Range: 2 to 256"); | |
76 | unsigned int cifs_max_pending = CIFS_MAX_REQ; | |
77 | module_param(cifs_max_pending, int, 0444); | |
78 | MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. " | |
79 | "Default: 32767 Range: 2 to 32767."); | |
80 | module_param(enable_oplocks, bool, 0644); | |
81 | MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:" | |
82 | "y/Y/1"); | |
83 | ||
84 | extern mempool_t *cifs_sm_req_poolp; | |
85 | extern mempool_t *cifs_req_poolp; | |
86 | extern mempool_t *cifs_mid_poolp; | |
87 | ||
88 | struct workqueue_struct *cifsiod_wq; | |
89 | ||
90 | static int | |
91 | cifs_read_super(struct super_block *sb) | |
92 | { | |
93 | struct inode *inode; | |
94 | struct cifs_sb_info *cifs_sb; | |
95 | int rc = 0; | |
96 | ||
97 | cifs_sb = CIFS_SB(sb); | |
98 | ||
99 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL) | |
100 | sb->s_flags |= MS_POSIXACL; | |
101 | ||
102 | if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES) | |
103 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
104 | else | |
105 | sb->s_maxbytes = MAX_NON_LFS; | |
106 | ||
107 | /* BB FIXME fix time_gran to be larger for LANMAN sessions */ | |
108 | sb->s_time_gran = 100; | |
109 | ||
110 | sb->s_magic = CIFS_MAGIC_NUMBER; | |
111 | sb->s_op = &cifs_super_ops; | |
112 | sb->s_bdi = &cifs_sb->bdi; | |
113 | sb->s_blocksize = CIFS_MAX_MSGSIZE; | |
114 | sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ | |
115 | inode = cifs_root_iget(sb); | |
116 | ||
117 | if (IS_ERR(inode)) { | |
118 | rc = PTR_ERR(inode); | |
119 | goto out_no_root; | |
120 | } | |
121 | ||
122 | sb->s_root = d_make_root(inode); | |
123 | if (!sb->s_root) { | |
124 | rc = -ENOMEM; | |
125 | goto out_no_root; | |
126 | } | |
127 | ||
128 | /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */ | |
129 | if (cifs_sb_master_tcon(cifs_sb)->nocase) | |
130 | sb->s_d_op = &cifs_ci_dentry_ops; | |
131 | else | |
132 | sb->s_d_op = &cifs_dentry_ops; | |
133 | ||
134 | #ifdef CONFIG_CIFS_NFSD_EXPORT | |
135 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
136 | cFYI(1, "export ops supported"); | |
137 | sb->s_export_op = &cifs_export_ops; | |
138 | } | |
139 | #endif /* CONFIG_CIFS_NFSD_EXPORT */ | |
140 | ||
141 | return 0; | |
142 | ||
143 | out_no_root: | |
144 | cERROR(1, "cifs_read_super: get root inode failed"); | |
145 | return rc; | |
146 | } | |
147 | ||
148 | static void cifs_kill_sb(struct super_block *sb) | |
149 | { | |
150 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
151 | kill_anon_super(sb); | |
152 | cifs_umount(cifs_sb); | |
153 | } | |
154 | ||
155 | static int | |
156 | cifs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
157 | { | |
158 | struct super_block *sb = dentry->d_sb; | |
159 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
160 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); | |
161 | int rc = -EOPNOTSUPP; | |
162 | int xid; | |
163 | ||
164 | xid = GetXid(); | |
165 | ||
166 | buf->f_type = CIFS_MAGIC_NUMBER; | |
167 | ||
168 | /* | |
169 | * PATH_MAX may be too long - it would presumably be total path, | |
170 | * but note that some servers (includinng Samba 3) have a shorter | |
171 | * maximum path. | |
172 | * | |
173 | * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO. | |
174 | */ | |
175 | buf->f_namelen = PATH_MAX; | |
176 | buf->f_files = 0; /* undefined */ | |
177 | buf->f_ffree = 0; /* unlimited */ | |
178 | ||
179 | /* | |
180 | * We could add a second check for a QFS Unix capability bit | |
181 | */ | |
182 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
183 | (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) | |
184 | rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); | |
185 | ||
186 | /* | |
187 | * Only need to call the old QFSInfo if failed on newer one, | |
188 | * e.g. by OS/2. | |
189 | **/ | |
190 | if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) | |
191 | rc = CIFSSMBQFSInfo(xid, tcon, buf); | |
192 | ||
193 | /* | |
194 | * Some old Windows servers also do not support level 103, retry with | |
195 | * older level one if old server failed the previous call or we | |
196 | * bypassed it because we detected that this was an older LANMAN sess | |
197 | */ | |
198 | if (rc) | |
199 | rc = SMBOldQFSInfo(xid, tcon, buf); | |
200 | ||
201 | FreeXid(xid); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int cifs_permission(struct inode *inode, int mask) | |
206 | { | |
207 | struct cifs_sb_info *cifs_sb; | |
208 | ||
209 | cifs_sb = CIFS_SB(inode->i_sb); | |
210 | ||
211 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { | |
212 | if ((mask & MAY_EXEC) && !execute_ok(inode)) | |
213 | return -EACCES; | |
214 | else | |
215 | return 0; | |
216 | } else /* file mode might have been restricted at mount time | |
217 | on the client (above and beyond ACL on servers) for | |
218 | servers which do not support setting and viewing mode bits, | |
219 | so allowing client to check permissions is useful */ | |
220 | return generic_permission(inode, mask); | |
221 | } | |
222 | ||
223 | static struct kmem_cache *cifs_inode_cachep; | |
224 | static struct kmem_cache *cifs_req_cachep; | |
225 | static struct kmem_cache *cifs_mid_cachep; | |
226 | static struct kmem_cache *cifs_sm_req_cachep; | |
227 | mempool_t *cifs_sm_req_poolp; | |
228 | mempool_t *cifs_req_poolp; | |
229 | mempool_t *cifs_mid_poolp; | |
230 | ||
231 | static struct inode * | |
232 | cifs_alloc_inode(struct super_block *sb) | |
233 | { | |
234 | struct cifsInodeInfo *cifs_inode; | |
235 | cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL); | |
236 | if (!cifs_inode) | |
237 | return NULL; | |
238 | cifs_inode->cifsAttrs = 0x20; /* default */ | |
239 | cifs_inode->time = 0; | |
240 | /* Until the file is open and we have gotten oplock | |
241 | info back from the server, can not assume caching of | |
242 | file data or metadata */ | |
243 | cifs_set_oplock_level(cifs_inode, 0); | |
244 | cifs_inode->delete_pending = false; | |
245 | cifs_inode->invalid_mapping = false; | |
246 | cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ | |
247 | cifs_inode->server_eof = 0; | |
248 | cifs_inode->uniqueid = 0; | |
249 | cifs_inode->createtime = 0; | |
250 | ||
251 | /* Can not set i_flags here - they get immediately overwritten | |
252 | to zero by the VFS */ | |
253 | /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/ | |
254 | INIT_LIST_HEAD(&cifs_inode->openFileList); | |
255 | return &cifs_inode->vfs_inode; | |
256 | } | |
257 | ||
258 | static void cifs_i_callback(struct rcu_head *head) | |
259 | { | |
260 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
261 | INIT_LIST_HEAD(&inode->i_dentry); | |
262 | kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); | |
263 | } | |
264 | ||
265 | static void | |
266 | cifs_destroy_inode(struct inode *inode) | |
267 | { | |
268 | call_rcu(&inode->i_rcu, cifs_i_callback); | |
269 | } | |
270 | ||
271 | static void | |
272 | cifs_evict_inode(struct inode *inode) | |
273 | { | |
274 | truncate_inode_pages(&inode->i_data, 0); | |
275 | end_writeback(inode); | |
276 | cifs_fscache_release_inode_cookie(inode); | |
277 | } | |
278 | ||
279 | static void | |
280 | cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server) | |
281 | { | |
282 | struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr; | |
283 | struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr; | |
284 | ||
285 | seq_printf(s, ",addr="); | |
286 | ||
287 | switch (server->dstaddr.ss_family) { | |
288 | case AF_INET: | |
289 | seq_printf(s, "%pI4", &sa->sin_addr.s_addr); | |
290 | break; | |
291 | case AF_INET6: | |
292 | seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr); | |
293 | if (sa6->sin6_scope_id) | |
294 | seq_printf(s, "%%%u", sa6->sin6_scope_id); | |
295 | break; | |
296 | default: | |
297 | seq_printf(s, "(unknown)"); | |
298 | } | |
299 | } | |
300 | ||
301 | static void | |
302 | cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server) | |
303 | { | |
304 | seq_printf(s, ",sec="); | |
305 | ||
306 | switch (server->secType) { | |
307 | case LANMAN: | |
308 | seq_printf(s, "lanman"); | |
309 | break; | |
310 | case NTLMv2: | |
311 | seq_printf(s, "ntlmv2"); | |
312 | break; | |
313 | case NTLM: | |
314 | seq_printf(s, "ntlm"); | |
315 | break; | |
316 | case Kerberos: | |
317 | seq_printf(s, "krb5"); | |
318 | break; | |
319 | case RawNTLMSSP: | |
320 | seq_printf(s, "ntlmssp"); | |
321 | break; | |
322 | default: | |
323 | /* shouldn't ever happen */ | |
324 | seq_printf(s, "unknown"); | |
325 | break; | |
326 | } | |
327 | ||
328 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
329 | seq_printf(s, "i"); | |
330 | } | |
331 | ||
332 | /* | |
333 | * cifs_show_options() is for displaying mount options in /proc/mounts. | |
334 | * Not all settable options are displayed but most of the important | |
335 | * ones are. | |
336 | */ | |
337 | static int | |
338 | cifs_show_options(struct seq_file *s, struct dentry *root) | |
339 | { | |
340 | struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); | |
341 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); | |
342 | struct sockaddr *srcaddr; | |
343 | srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr; | |
344 | ||
345 | cifs_show_security(s, tcon->ses->server); | |
346 | ||
347 | seq_printf(s, ",unc=%s", tcon->treeName); | |
348 | ||
349 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) | |
350 | seq_printf(s, ",multiuser"); | |
351 | else if (tcon->ses->user_name) | |
352 | seq_printf(s, ",username=%s", tcon->ses->user_name); | |
353 | ||
354 | if (tcon->ses->domainName) | |
355 | seq_printf(s, ",domain=%s", tcon->ses->domainName); | |
356 | ||
357 | if (srcaddr->sa_family != AF_UNSPEC) { | |
358 | struct sockaddr_in *saddr4; | |
359 | struct sockaddr_in6 *saddr6; | |
360 | saddr4 = (struct sockaddr_in *)srcaddr; | |
361 | saddr6 = (struct sockaddr_in6 *)srcaddr; | |
362 | if (srcaddr->sa_family == AF_INET6) | |
363 | seq_printf(s, ",srcaddr=%pI6c", | |
364 | &saddr6->sin6_addr); | |
365 | else if (srcaddr->sa_family == AF_INET) | |
366 | seq_printf(s, ",srcaddr=%pI4", | |
367 | &saddr4->sin_addr.s_addr); | |
368 | else | |
369 | seq_printf(s, ",srcaddr=BAD-AF:%i", | |
370 | (int)(srcaddr->sa_family)); | |
371 | } | |
372 | ||
373 | seq_printf(s, ",uid=%d", cifs_sb->mnt_uid); | |
374 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) | |
375 | seq_printf(s, ",forceuid"); | |
376 | else | |
377 | seq_printf(s, ",noforceuid"); | |
378 | ||
379 | seq_printf(s, ",gid=%d", cifs_sb->mnt_gid); | |
380 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) | |
381 | seq_printf(s, ",forcegid"); | |
382 | else | |
383 | seq_printf(s, ",noforcegid"); | |
384 | ||
385 | cifs_show_address(s, tcon->ses->server); | |
386 | ||
387 | if (!tcon->unix_ext) | |
388 | seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho", | |
389 | cifs_sb->mnt_file_mode, | |
390 | cifs_sb->mnt_dir_mode); | |
391 | if (tcon->seal) | |
392 | seq_printf(s, ",seal"); | |
393 | if (tcon->nocase) | |
394 | seq_printf(s, ",nocase"); | |
395 | if (tcon->retry) | |
396 | seq_printf(s, ",hard"); | |
397 | if (tcon->unix_ext) | |
398 | seq_printf(s, ",unix"); | |
399 | else | |
400 | seq_printf(s, ",nounix"); | |
401 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) | |
402 | seq_printf(s, ",posixpaths"); | |
403 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) | |
404 | seq_printf(s, ",setuids"); | |
405 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) | |
406 | seq_printf(s, ",serverino"); | |
407 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
408 | seq_printf(s, ",rwpidforward"); | |
409 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) | |
410 | seq_printf(s, ",forcemand"); | |
411 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) | |
412 | seq_printf(s, ",directio"); | |
413 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) | |
414 | seq_printf(s, ",nouser_xattr"); | |
415 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
416 | seq_printf(s, ",mapchars"); | |
417 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) | |
418 | seq_printf(s, ",sfu"); | |
419 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
420 | seq_printf(s, ",nobrl"); | |
421 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) | |
422 | seq_printf(s, ",cifsacl"); | |
423 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) | |
424 | seq_printf(s, ",dynperm"); | |
425 | if (root->d_sb->s_flags & MS_POSIXACL) | |
426 | seq_printf(s, ",acl"); | |
427 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
428 | seq_printf(s, ",mfsymlinks"); | |
429 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) | |
430 | seq_printf(s, ",fsc"); | |
431 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC) | |
432 | seq_printf(s, ",nostrictsync"); | |
433 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) | |
434 | seq_printf(s, ",noperm"); | |
435 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
436 | seq_printf(s, ",strictcache"); | |
437 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) | |
438 | seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid); | |
439 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) | |
440 | seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid); | |
441 | ||
442 | seq_printf(s, ",rsize=%d", cifs_sb->rsize); | |
443 | seq_printf(s, ",wsize=%d", cifs_sb->wsize); | |
444 | /* convert actimeo and display it in seconds */ | |
445 | seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static void cifs_umount_begin(struct super_block *sb) | |
451 | { | |
452 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
453 | struct cifs_tcon *tcon; | |
454 | ||
455 | if (cifs_sb == NULL) | |
456 | return; | |
457 | ||
458 | tcon = cifs_sb_master_tcon(cifs_sb); | |
459 | ||
460 | spin_lock(&cifs_tcp_ses_lock); | |
461 | if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) { | |
462 | /* we have other mounts to same share or we have | |
463 | already tried to force umount this and woken up | |
464 | all waiting network requests, nothing to do */ | |
465 | spin_unlock(&cifs_tcp_ses_lock); | |
466 | return; | |
467 | } else if (tcon->tc_count == 1) | |
468 | tcon->tidStatus = CifsExiting; | |
469 | spin_unlock(&cifs_tcp_ses_lock); | |
470 | ||
471 | /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ | |
472 | /* cancel_notify_requests(tcon); */ | |
473 | if (tcon->ses && tcon->ses->server) { | |
474 | cFYI(1, "wake up tasks now - umount begin not complete"); | |
475 | wake_up_all(&tcon->ses->server->request_q); | |
476 | wake_up_all(&tcon->ses->server->response_q); | |
477 | msleep(1); /* yield */ | |
478 | /* we have to kick the requests once more */ | |
479 | wake_up_all(&tcon->ses->server->response_q); | |
480 | msleep(1); | |
481 | } | |
482 | ||
483 | return; | |
484 | } | |
485 | ||
486 | #ifdef CONFIG_CIFS_STATS2 | |
487 | static int cifs_show_stats(struct seq_file *s, struct dentry *root) | |
488 | { | |
489 | /* BB FIXME */ | |
490 | return 0; | |
491 | } | |
492 | #endif | |
493 | ||
494 | static int cifs_remount(struct super_block *sb, int *flags, char *data) | |
495 | { | |
496 | *flags |= MS_NODIRATIME; | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static int cifs_drop_inode(struct inode *inode) | |
501 | { | |
502 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
503 | ||
504 | /* no serverino => unconditional eviction */ | |
505 | return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) || | |
506 | generic_drop_inode(inode); | |
507 | } | |
508 | ||
509 | static const struct super_operations cifs_super_ops = { | |
510 | .statfs = cifs_statfs, | |
511 | .alloc_inode = cifs_alloc_inode, | |
512 | .destroy_inode = cifs_destroy_inode, | |
513 | .drop_inode = cifs_drop_inode, | |
514 | .evict_inode = cifs_evict_inode, | |
515 | /* .delete_inode = cifs_delete_inode, */ /* Do not need above | |
516 | function unless later we add lazy close of inodes or unless the | |
517 | kernel forgets to call us with the same number of releases (closes) | |
518 | as opens */ | |
519 | .show_options = cifs_show_options, | |
520 | .umount_begin = cifs_umount_begin, | |
521 | .remount_fs = cifs_remount, | |
522 | #ifdef CONFIG_CIFS_STATS2 | |
523 | .show_stats = cifs_show_stats, | |
524 | #endif | |
525 | }; | |
526 | ||
527 | /* | |
528 | * Get root dentry from superblock according to prefix path mount option. | |
529 | * Return dentry with refcount + 1 on success and NULL otherwise. | |
530 | */ | |
531 | static struct dentry * | |
532 | cifs_get_root(struct smb_vol *vol, struct super_block *sb) | |
533 | { | |
534 | struct dentry *dentry; | |
535 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
536 | char *full_path = NULL; | |
537 | char *s, *p; | |
538 | char sep; | |
539 | ||
540 | full_path = cifs_build_path_to_root(vol, cifs_sb, | |
541 | cifs_sb_master_tcon(cifs_sb)); | |
542 | if (full_path == NULL) | |
543 | return ERR_PTR(-ENOMEM); | |
544 | ||
545 | cFYI(1, "Get root dentry for %s", full_path); | |
546 | ||
547 | sep = CIFS_DIR_SEP(cifs_sb); | |
548 | dentry = dget(sb->s_root); | |
549 | p = s = full_path; | |
550 | ||
551 | do { | |
552 | struct inode *dir = dentry->d_inode; | |
553 | struct dentry *child; | |
554 | ||
555 | if (!dir) { | |
556 | dput(dentry); | |
557 | dentry = ERR_PTR(-ENOENT); | |
558 | break; | |
559 | } | |
560 | ||
561 | /* skip separators */ | |
562 | while (*s == sep) | |
563 | s++; | |
564 | if (!*s) | |
565 | break; | |
566 | p = s++; | |
567 | /* next separator */ | |
568 | while (*s && *s != sep) | |
569 | s++; | |
570 | ||
571 | mutex_lock(&dir->i_mutex); | |
572 | child = lookup_one_len(p, dentry, s - p); | |
573 | mutex_unlock(&dir->i_mutex); | |
574 | dput(dentry); | |
575 | dentry = child; | |
576 | } while (!IS_ERR(dentry)); | |
577 | kfree(full_path); | |
578 | return dentry; | |
579 | } | |
580 | ||
581 | static int cifs_set_super(struct super_block *sb, void *data) | |
582 | { | |
583 | struct cifs_mnt_data *mnt_data = data; | |
584 | sb->s_fs_info = mnt_data->cifs_sb; | |
585 | return set_anon_super(sb, NULL); | |
586 | } | |
587 | ||
588 | static struct dentry * | |
589 | cifs_do_mount(struct file_system_type *fs_type, | |
590 | int flags, const char *dev_name, void *data) | |
591 | { | |
592 | int rc; | |
593 | struct super_block *sb; | |
594 | struct cifs_sb_info *cifs_sb; | |
595 | struct smb_vol *volume_info; | |
596 | struct cifs_mnt_data mnt_data; | |
597 | struct dentry *root; | |
598 | ||
599 | cFYI(1, "Devname: %s flags: %d ", dev_name, flags); | |
600 | ||
601 | volume_info = cifs_get_volume_info((char *)data, dev_name); | |
602 | if (IS_ERR(volume_info)) | |
603 | return ERR_CAST(volume_info); | |
604 | ||
605 | cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); | |
606 | if (cifs_sb == NULL) { | |
607 | root = ERR_PTR(-ENOMEM); | |
608 | goto out_nls; | |
609 | } | |
610 | ||
611 | cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL); | |
612 | if (cifs_sb->mountdata == NULL) { | |
613 | root = ERR_PTR(-ENOMEM); | |
614 | goto out_cifs_sb; | |
615 | } | |
616 | ||
617 | cifs_setup_cifs_sb(volume_info, cifs_sb); | |
618 | ||
619 | rc = cifs_mount(cifs_sb, volume_info); | |
620 | if (rc) { | |
621 | if (!(flags & MS_SILENT)) | |
622 | cERROR(1, "cifs_mount failed w/return code = %d", rc); | |
623 | root = ERR_PTR(rc); | |
624 | goto out_mountdata; | |
625 | } | |
626 | ||
627 | mnt_data.vol = volume_info; | |
628 | mnt_data.cifs_sb = cifs_sb; | |
629 | mnt_data.flags = flags; | |
630 | ||
631 | sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data); | |
632 | if (IS_ERR(sb)) { | |
633 | root = ERR_CAST(sb); | |
634 | cifs_umount(cifs_sb); | |
635 | goto out; | |
636 | } | |
637 | ||
638 | if (sb->s_root) { | |
639 | cFYI(1, "Use existing superblock"); | |
640 | cifs_umount(cifs_sb); | |
641 | } else { | |
642 | sb->s_flags = flags; | |
643 | /* BB should we make this contingent on mount parm? */ | |
644 | sb->s_flags |= MS_NODIRATIME | MS_NOATIME; | |
645 | ||
646 | rc = cifs_read_super(sb); | |
647 | if (rc) { | |
648 | root = ERR_PTR(rc); | |
649 | goto out_super; | |
650 | } | |
651 | ||
652 | sb->s_flags |= MS_ACTIVE; | |
653 | } | |
654 | ||
655 | root = cifs_get_root(volume_info, sb); | |
656 | if (IS_ERR(root)) | |
657 | goto out_super; | |
658 | ||
659 | cFYI(1, "dentry root is: %p", root); | |
660 | goto out; | |
661 | ||
662 | out_super: | |
663 | deactivate_locked_super(sb); | |
664 | out: | |
665 | cifs_cleanup_volume_info(volume_info); | |
666 | return root; | |
667 | ||
668 | out_mountdata: | |
669 | kfree(cifs_sb->mountdata); | |
670 | out_cifs_sb: | |
671 | kfree(cifs_sb); | |
672 | out_nls: | |
673 | unload_nls(volume_info->local_nls); | |
674 | goto out; | |
675 | } | |
676 | ||
677 | static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
678 | unsigned long nr_segs, loff_t pos) | |
679 | { | |
680 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; | |
681 | ssize_t written; | |
682 | int rc; | |
683 | ||
684 | written = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
685 | ||
686 | if (CIFS_I(inode)->clientCanCacheAll) | |
687 | return written; | |
688 | ||
689 | rc = filemap_fdatawrite(inode->i_mapping); | |
690 | if (rc) | |
691 | cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode); | |
692 | ||
693 | return written; | |
694 | } | |
695 | ||
696 | static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) | |
697 | { | |
698 | /* | |
699 | * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate | |
700 | * the cached file length | |
701 | */ | |
702 | if (origin != SEEK_SET || origin != SEEK_CUR) { | |
703 | int rc; | |
704 | struct inode *inode = file->f_path.dentry->d_inode; | |
705 | ||
706 | /* | |
707 | * We need to be sure that all dirty pages are written and the | |
708 | * server has the newest file length. | |
709 | */ | |
710 | if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping && | |
711 | inode->i_mapping->nrpages != 0) { | |
712 | rc = filemap_fdatawait(inode->i_mapping); | |
713 | if (rc) { | |
714 | mapping_set_error(inode->i_mapping, rc); | |
715 | return rc; | |
716 | } | |
717 | } | |
718 | /* | |
719 | * Some applications poll for the file length in this strange | |
720 | * way so we must seek to end on non-oplocked files by | |
721 | * setting the revalidate time to zero. | |
722 | */ | |
723 | CIFS_I(inode)->time = 0; | |
724 | ||
725 | rc = cifs_revalidate_file_attr(file); | |
726 | if (rc < 0) | |
727 | return (loff_t)rc; | |
728 | } | |
729 | return generic_file_llseek(file, offset, origin); | |
730 | } | |
731 | ||
732 | static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) | |
733 | { | |
734 | /* note that this is called by vfs setlease with lock_flocks held | |
735 | to protect *lease from going away */ | |
736 | struct inode *inode = file->f_path.dentry->d_inode; | |
737 | struct cifsFileInfo *cfile = file->private_data; | |
738 | ||
739 | if (!(S_ISREG(inode->i_mode))) | |
740 | return -EINVAL; | |
741 | ||
742 | /* check if file is oplocked */ | |
743 | if (((arg == F_RDLCK) && | |
744 | (CIFS_I(inode)->clientCanCacheRead)) || | |
745 | ((arg == F_WRLCK) && | |
746 | (CIFS_I(inode)->clientCanCacheAll))) | |
747 | return generic_setlease(file, arg, lease); | |
748 | else if (tlink_tcon(cfile->tlink)->local_lease && | |
749 | !CIFS_I(inode)->clientCanCacheRead) | |
750 | /* If the server claims to support oplock on this | |
751 | file, then we still need to check oplock even | |
752 | if the local_lease mount option is set, but there | |
753 | are servers which do not support oplock for which | |
754 | this mount option may be useful if the user | |
755 | knows that the file won't be changed on the server | |
756 | by anyone else */ | |
757 | return generic_setlease(file, arg, lease); | |
758 | else | |
759 | return -EAGAIN; | |
760 | } | |
761 | ||
762 | struct file_system_type cifs_fs_type = { | |
763 | .owner = THIS_MODULE, | |
764 | .name = "cifs", | |
765 | .mount = cifs_do_mount, | |
766 | .kill_sb = cifs_kill_sb, | |
767 | /* .fs_flags */ | |
768 | }; | |
769 | const struct inode_operations cifs_dir_inode_ops = { | |
770 | .create = cifs_create, | |
771 | .lookup = cifs_lookup, | |
772 | .getattr = cifs_getattr, | |
773 | .unlink = cifs_unlink, | |
774 | .link = cifs_hardlink, | |
775 | .mkdir = cifs_mkdir, | |
776 | .rmdir = cifs_rmdir, | |
777 | .rename = cifs_rename, | |
778 | .permission = cifs_permission, | |
779 | /* revalidate:cifs_revalidate, */ | |
780 | .setattr = cifs_setattr, | |
781 | .symlink = cifs_symlink, | |
782 | .mknod = cifs_mknod, | |
783 | #ifdef CONFIG_CIFS_XATTR | |
784 | .setxattr = cifs_setxattr, | |
785 | .getxattr = cifs_getxattr, | |
786 | .listxattr = cifs_listxattr, | |
787 | .removexattr = cifs_removexattr, | |
788 | #endif | |
789 | }; | |
790 | ||
791 | const struct inode_operations cifs_file_inode_ops = { | |
792 | /* revalidate:cifs_revalidate, */ | |
793 | .setattr = cifs_setattr, | |
794 | .getattr = cifs_getattr, /* do we need this anymore? */ | |
795 | .rename = cifs_rename, | |
796 | .permission = cifs_permission, | |
797 | #ifdef CONFIG_CIFS_XATTR | |
798 | .setxattr = cifs_setxattr, | |
799 | .getxattr = cifs_getxattr, | |
800 | .listxattr = cifs_listxattr, | |
801 | .removexattr = cifs_removexattr, | |
802 | #endif | |
803 | }; | |
804 | ||
805 | const struct inode_operations cifs_symlink_inode_ops = { | |
806 | .readlink = generic_readlink, | |
807 | .follow_link = cifs_follow_link, | |
808 | .put_link = cifs_put_link, | |
809 | .permission = cifs_permission, | |
810 | /* BB add the following two eventually */ | |
811 | /* revalidate: cifs_revalidate, | |
812 | setattr: cifs_notify_change, *//* BB do we need notify change */ | |
813 | #ifdef CONFIG_CIFS_XATTR | |
814 | .setxattr = cifs_setxattr, | |
815 | .getxattr = cifs_getxattr, | |
816 | .listxattr = cifs_listxattr, | |
817 | .removexattr = cifs_removexattr, | |
818 | #endif | |
819 | }; | |
820 | ||
821 | const struct file_operations cifs_file_ops = { | |
822 | .read = do_sync_read, | |
823 | .write = do_sync_write, | |
824 | .aio_read = generic_file_aio_read, | |
825 | .aio_write = cifs_file_aio_write, | |
826 | .open = cifs_open, | |
827 | .release = cifs_close, | |
828 | .lock = cifs_lock, | |
829 | .fsync = cifs_fsync, | |
830 | .flush = cifs_flush, | |
831 | .mmap = cifs_file_mmap, | |
832 | .splice_read = generic_file_splice_read, | |
833 | .llseek = cifs_llseek, | |
834 | #ifdef CONFIG_CIFS_POSIX | |
835 | .unlocked_ioctl = cifs_ioctl, | |
836 | #endif /* CONFIG_CIFS_POSIX */ | |
837 | .setlease = cifs_setlease, | |
838 | }; | |
839 | ||
840 | const struct file_operations cifs_file_strict_ops = { | |
841 | .read = do_sync_read, | |
842 | .write = do_sync_write, | |
843 | .aio_read = cifs_strict_readv, | |
844 | .aio_write = cifs_strict_writev, | |
845 | .open = cifs_open, | |
846 | .release = cifs_close, | |
847 | .lock = cifs_lock, | |
848 | .fsync = cifs_strict_fsync, | |
849 | .flush = cifs_flush, | |
850 | .mmap = cifs_file_strict_mmap, | |
851 | .splice_read = generic_file_splice_read, | |
852 | .llseek = cifs_llseek, | |
853 | #ifdef CONFIG_CIFS_POSIX | |
854 | .unlocked_ioctl = cifs_ioctl, | |
855 | #endif /* CONFIG_CIFS_POSIX */ | |
856 | .setlease = cifs_setlease, | |
857 | }; | |
858 | ||
859 | const struct file_operations cifs_file_direct_ops = { | |
860 | /* BB reevaluate whether they can be done with directio, no cache */ | |
861 | .read = do_sync_read, | |
862 | .write = do_sync_write, | |
863 | .aio_read = cifs_user_readv, | |
864 | .aio_write = cifs_user_writev, | |
865 | .open = cifs_open, | |
866 | .release = cifs_close, | |
867 | .lock = cifs_lock, | |
868 | .fsync = cifs_fsync, | |
869 | .flush = cifs_flush, | |
870 | .mmap = cifs_file_mmap, | |
871 | .splice_read = generic_file_splice_read, | |
872 | #ifdef CONFIG_CIFS_POSIX | |
873 | .unlocked_ioctl = cifs_ioctl, | |
874 | #endif /* CONFIG_CIFS_POSIX */ | |
875 | .llseek = cifs_llseek, | |
876 | .setlease = cifs_setlease, | |
877 | }; | |
878 | ||
879 | const struct file_operations cifs_file_nobrl_ops = { | |
880 | .read = do_sync_read, | |
881 | .write = do_sync_write, | |
882 | .aio_read = generic_file_aio_read, | |
883 | .aio_write = cifs_file_aio_write, | |
884 | .open = cifs_open, | |
885 | .release = cifs_close, | |
886 | .fsync = cifs_fsync, | |
887 | .flush = cifs_flush, | |
888 | .mmap = cifs_file_mmap, | |
889 | .splice_read = generic_file_splice_read, | |
890 | .llseek = cifs_llseek, | |
891 | #ifdef CONFIG_CIFS_POSIX | |
892 | .unlocked_ioctl = cifs_ioctl, | |
893 | #endif /* CONFIG_CIFS_POSIX */ | |
894 | .setlease = cifs_setlease, | |
895 | }; | |
896 | ||
897 | const struct file_operations cifs_file_strict_nobrl_ops = { | |
898 | .read = do_sync_read, | |
899 | .write = do_sync_write, | |
900 | .aio_read = cifs_strict_readv, | |
901 | .aio_write = cifs_strict_writev, | |
902 | .open = cifs_open, | |
903 | .release = cifs_close, | |
904 | .fsync = cifs_strict_fsync, | |
905 | .flush = cifs_flush, | |
906 | .mmap = cifs_file_strict_mmap, | |
907 | .splice_read = generic_file_splice_read, | |
908 | .llseek = cifs_llseek, | |
909 | #ifdef CONFIG_CIFS_POSIX | |
910 | .unlocked_ioctl = cifs_ioctl, | |
911 | #endif /* CONFIG_CIFS_POSIX */ | |
912 | .setlease = cifs_setlease, | |
913 | }; | |
914 | ||
915 | const struct file_operations cifs_file_direct_nobrl_ops = { | |
916 | /* BB reevaluate whether they can be done with directio, no cache */ | |
917 | .read = do_sync_read, | |
918 | .write = do_sync_write, | |
919 | .aio_read = cifs_user_readv, | |
920 | .aio_write = cifs_user_writev, | |
921 | .open = cifs_open, | |
922 | .release = cifs_close, | |
923 | .fsync = cifs_fsync, | |
924 | .flush = cifs_flush, | |
925 | .mmap = cifs_file_mmap, | |
926 | .splice_read = generic_file_splice_read, | |
927 | #ifdef CONFIG_CIFS_POSIX | |
928 | .unlocked_ioctl = cifs_ioctl, | |
929 | #endif /* CONFIG_CIFS_POSIX */ | |
930 | .llseek = cifs_llseek, | |
931 | .setlease = cifs_setlease, | |
932 | }; | |
933 | ||
934 | const struct file_operations cifs_dir_ops = { | |
935 | .readdir = cifs_readdir, | |
936 | .release = cifs_closedir, | |
937 | .read = generic_read_dir, | |
938 | .unlocked_ioctl = cifs_ioctl, | |
939 | .llseek = generic_file_llseek, | |
940 | }; | |
941 | ||
942 | static void | |
943 | cifs_init_once(void *inode) | |
944 | { | |
945 | struct cifsInodeInfo *cifsi = inode; | |
946 | ||
947 | inode_init_once(&cifsi->vfs_inode); | |
948 | INIT_LIST_HEAD(&cifsi->llist); | |
949 | mutex_init(&cifsi->lock_mutex); | |
950 | } | |
951 | ||
952 | static int | |
953 | cifs_init_inodecache(void) | |
954 | { | |
955 | cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", | |
956 | sizeof(struct cifsInodeInfo), | |
957 | 0, (SLAB_RECLAIM_ACCOUNT| | |
958 | SLAB_MEM_SPREAD), | |
959 | cifs_init_once); | |
960 | if (cifs_inode_cachep == NULL) | |
961 | return -ENOMEM; | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | static void | |
967 | cifs_destroy_inodecache(void) | |
968 | { | |
969 | kmem_cache_destroy(cifs_inode_cachep); | |
970 | } | |
971 | ||
972 | static int | |
973 | cifs_init_request_bufs(void) | |
974 | { | |
975 | if (CIFSMaxBufSize < 8192) { | |
976 | /* Buffer size can not be smaller than 2 * PATH_MAX since maximum | |
977 | Unicode path name has to fit in any SMB/CIFS path based frames */ | |
978 | CIFSMaxBufSize = 8192; | |
979 | } else if (CIFSMaxBufSize > 1024*127) { | |
980 | CIFSMaxBufSize = 1024 * 127; | |
981 | } else { | |
982 | CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ | |
983 | } | |
984 | /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */ | |
985 | cifs_req_cachep = kmem_cache_create("cifs_request", | |
986 | CIFSMaxBufSize + | |
987 | MAX_CIFS_HDR_SIZE, 0, | |
988 | SLAB_HWCACHE_ALIGN, NULL); | |
989 | if (cifs_req_cachep == NULL) | |
990 | return -ENOMEM; | |
991 | ||
992 | if (cifs_min_rcv < 1) | |
993 | cifs_min_rcv = 1; | |
994 | else if (cifs_min_rcv > 64) { | |
995 | cifs_min_rcv = 64; | |
996 | cERROR(1, "cifs_min_rcv set to maximum (64)"); | |
997 | } | |
998 | ||
999 | cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, | |
1000 | cifs_req_cachep); | |
1001 | ||
1002 | if (cifs_req_poolp == NULL) { | |
1003 | kmem_cache_destroy(cifs_req_cachep); | |
1004 | return -ENOMEM; | |
1005 | } | |
1006 | /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and | |
1007 | almost all handle based requests (but not write response, nor is it | |
1008 | sufficient for path based requests). A smaller size would have | |
1009 | been more efficient (compacting multiple slab items on one 4k page) | |
1010 | for the case in which debug was on, but this larger size allows | |
1011 | more SMBs to use small buffer alloc and is still much more | |
1012 | efficient to alloc 1 per page off the slab compared to 17K (5page) | |
1013 | alloc of large cifs buffers even when page debugging is on */ | |
1014 | cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", | |
1015 | MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, | |
1016 | NULL); | |
1017 | if (cifs_sm_req_cachep == NULL) { | |
1018 | mempool_destroy(cifs_req_poolp); | |
1019 | kmem_cache_destroy(cifs_req_cachep); | |
1020 | return -ENOMEM; | |
1021 | } | |
1022 | ||
1023 | if (cifs_min_small < 2) | |
1024 | cifs_min_small = 2; | |
1025 | else if (cifs_min_small > 256) { | |
1026 | cifs_min_small = 256; | |
1027 | cFYI(1, "cifs_min_small set to maximum (256)"); | |
1028 | } | |
1029 | ||
1030 | cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, | |
1031 | cifs_sm_req_cachep); | |
1032 | ||
1033 | if (cifs_sm_req_poolp == NULL) { | |
1034 | mempool_destroy(cifs_req_poolp); | |
1035 | kmem_cache_destroy(cifs_req_cachep); | |
1036 | kmem_cache_destroy(cifs_sm_req_cachep); | |
1037 | return -ENOMEM; | |
1038 | } | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | static void | |
1044 | cifs_destroy_request_bufs(void) | |
1045 | { | |
1046 | mempool_destroy(cifs_req_poolp); | |
1047 | kmem_cache_destroy(cifs_req_cachep); | |
1048 | mempool_destroy(cifs_sm_req_poolp); | |
1049 | kmem_cache_destroy(cifs_sm_req_cachep); | |
1050 | } | |
1051 | ||
1052 | static int | |
1053 | cifs_init_mids(void) | |
1054 | { | |
1055 | cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", | |
1056 | sizeof(struct mid_q_entry), 0, | |
1057 | SLAB_HWCACHE_ALIGN, NULL); | |
1058 | if (cifs_mid_cachep == NULL) | |
1059 | return -ENOMEM; | |
1060 | ||
1061 | /* 3 is a reasonable minimum number of simultaneous operations */ | |
1062 | cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); | |
1063 | if (cifs_mid_poolp == NULL) { | |
1064 | kmem_cache_destroy(cifs_mid_cachep); | |
1065 | return -ENOMEM; | |
1066 | } | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static void | |
1072 | cifs_destroy_mids(void) | |
1073 | { | |
1074 | mempool_destroy(cifs_mid_poolp); | |
1075 | kmem_cache_destroy(cifs_mid_cachep); | |
1076 | } | |
1077 | ||
1078 | static int __init | |
1079 | init_cifs(void) | |
1080 | { | |
1081 | int rc = 0; | |
1082 | cifs_proc_init(); | |
1083 | INIT_LIST_HEAD(&cifs_tcp_ses_list); | |
1084 | #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */ | |
1085 | INIT_LIST_HEAD(&GlobalDnotifyReqList); | |
1086 | INIT_LIST_HEAD(&GlobalDnotifyRsp_Q); | |
1087 | #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */ | |
1088 | /* | |
1089 | * Initialize Global counters | |
1090 | */ | |
1091 | atomic_set(&sesInfoAllocCount, 0); | |
1092 | atomic_set(&tconInfoAllocCount, 0); | |
1093 | atomic_set(&tcpSesAllocCount, 0); | |
1094 | atomic_set(&tcpSesReconnectCount, 0); | |
1095 | atomic_set(&tconInfoReconnectCount, 0); | |
1096 | ||
1097 | atomic_set(&bufAllocCount, 0); | |
1098 | atomic_set(&smBufAllocCount, 0); | |
1099 | #ifdef CONFIG_CIFS_STATS2 | |
1100 | atomic_set(&totBufAllocCount, 0); | |
1101 | atomic_set(&totSmBufAllocCount, 0); | |
1102 | #endif /* CONFIG_CIFS_STATS2 */ | |
1103 | ||
1104 | atomic_set(&midCount, 0); | |
1105 | GlobalCurrentXid = 0; | |
1106 | GlobalTotalActiveXid = 0; | |
1107 | GlobalMaxActiveXid = 0; | |
1108 | spin_lock_init(&cifs_tcp_ses_lock); | |
1109 | spin_lock_init(&cifs_file_list_lock); | |
1110 | spin_lock_init(&GlobalMid_Lock); | |
1111 | ||
1112 | if (cifs_max_pending < 2) { | |
1113 | cifs_max_pending = 2; | |
1114 | cFYI(1, "cifs_max_pending set to min of 2"); | |
1115 | } else if (cifs_max_pending > CIFS_MAX_REQ) { | |
1116 | cifs_max_pending = CIFS_MAX_REQ; | |
1117 | cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ); | |
1118 | } | |
1119 | ||
1120 | cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); | |
1121 | if (!cifsiod_wq) { | |
1122 | rc = -ENOMEM; | |
1123 | goto out_clean_proc; | |
1124 | } | |
1125 | ||
1126 | rc = cifs_fscache_register(); | |
1127 | if (rc) | |
1128 | goto out_destroy_wq; | |
1129 | ||
1130 | rc = cifs_init_inodecache(); | |
1131 | if (rc) | |
1132 | goto out_unreg_fscache; | |
1133 | ||
1134 | rc = cifs_init_mids(); | |
1135 | if (rc) | |
1136 | goto out_destroy_inodecache; | |
1137 | ||
1138 | rc = cifs_init_request_bufs(); | |
1139 | if (rc) | |
1140 | goto out_destroy_mids; | |
1141 | ||
1142 | #ifdef CONFIG_CIFS_UPCALL | |
1143 | rc = register_key_type(&cifs_spnego_key_type); | |
1144 | if (rc) | |
1145 | goto out_destroy_request_bufs; | |
1146 | #endif /* CONFIG_CIFS_UPCALL */ | |
1147 | ||
1148 | #ifdef CONFIG_CIFS_ACL | |
1149 | rc = init_cifs_idmap(); | |
1150 | if (rc) | |
1151 | goto out_register_key_type; | |
1152 | #endif /* CONFIG_CIFS_ACL */ | |
1153 | ||
1154 | rc = register_filesystem(&cifs_fs_type); | |
1155 | if (rc) | |
1156 | goto out_init_cifs_idmap; | |
1157 | ||
1158 | return 0; | |
1159 | ||
1160 | out_init_cifs_idmap: | |
1161 | #ifdef CONFIG_CIFS_ACL | |
1162 | exit_cifs_idmap(); | |
1163 | out_register_key_type: | |
1164 | #endif | |
1165 | #ifdef CONFIG_CIFS_UPCALL | |
1166 | unregister_key_type(&cifs_spnego_key_type); | |
1167 | out_destroy_request_bufs: | |
1168 | #endif | |
1169 | cifs_destroy_request_bufs(); | |
1170 | out_destroy_mids: | |
1171 | cifs_destroy_mids(); | |
1172 | out_destroy_inodecache: | |
1173 | cifs_destroy_inodecache(); | |
1174 | out_unreg_fscache: | |
1175 | cifs_fscache_unregister(); | |
1176 | out_destroy_wq: | |
1177 | destroy_workqueue(cifsiod_wq); | |
1178 | out_clean_proc: | |
1179 | cifs_proc_clean(); | |
1180 | return rc; | |
1181 | } | |
1182 | ||
1183 | static void __exit | |
1184 | exit_cifs(void) | |
1185 | { | |
1186 | cFYI(DBG2, "exit_cifs"); | |
1187 | unregister_filesystem(&cifs_fs_type); | |
1188 | cifs_dfs_release_automount_timer(); | |
1189 | #ifdef CONFIG_CIFS_ACL | |
1190 | cifs_destroy_idmaptrees(); | |
1191 | exit_cifs_idmap(); | |
1192 | #endif | |
1193 | #ifdef CONFIG_CIFS_UPCALL | |
1194 | unregister_key_type(&cifs_spnego_key_type); | |
1195 | #endif | |
1196 | cifs_destroy_request_bufs(); | |
1197 | cifs_destroy_mids(); | |
1198 | cifs_destroy_inodecache(); | |
1199 | cifs_fscache_unregister(); | |
1200 | destroy_workqueue(cifsiod_wq); | |
1201 | cifs_proc_clean(); | |
1202 | } | |
1203 | ||
1204 | MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>"); | |
1205 | MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ | |
1206 | MODULE_DESCRIPTION | |
1207 | ("VFS to access servers complying with the SNIA CIFS Specification " | |
1208 | "e.g. Samba and Windows"); | |
1209 | MODULE_VERSION(CIFS_VERSION); | |
1210 | module_init(init_cifs) | |
1211 | module_exit(exit_cifs) |