1 /*
2 * fs/cifs/dir.c
3 *
4 * vfs operations that deal with dentries
5 *
6 * Copyright (C) International Business Machines Corp., 2002,2003
7 * Author(s): Steve French (sfrench@us.ibm.com)
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 #include <linux/fs.h>
24 #include <linux/stat.h>
25 #include <linux/slab.h>
26 #include <linux/namei.h>
27 #include "cifsfs.h"
28 #include "cifspdu.h"
29 #include "cifsglob.h"
30 #include "cifsproto.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33
34 void
35 renew_parental_timestamps(struct dentry *direntry)
36 {
37 /* BB check if there is a way to get the kernel to do this or if we really need this */
38 do {
39 direntry->d_time = jiffies;
40 direntry = direntry->d_parent;
41 } while (!IS_ROOT(direntry));
42 }
43
44 /* Note: caller must free return buffer */
45 char *
46 build_path_from_dentry(struct dentry *direntry)
47 {
48 struct dentry *temp;
49 int namelen = 0;
50 char *full_path;
51
52 if(direntry == NULL)
53 return NULL; /* not much we can do if dentry is freed and
54 we need to reopen the file after it was closed implicitly
55 when the server crashed */
56
57 cifs_bp_rename_retry:
58 for (temp = direntry; !IS_ROOT(temp);) {
59 namelen += (1 + temp->d_name.len);
60 temp = temp->d_parent;
61 if(temp == NULL) {
62 cERROR(1,("corrupt dentry"));
63 return NULL;
64 }
65 }
66
67 full_path = kmalloc(namelen+1, GFP_KERNEL);
68 if(full_path == NULL)
69 return full_path;
70 full_path[namelen] = 0; /* trailing null */
71
72 for (temp = direntry; !IS_ROOT(temp);) {
73 namelen -= 1 + temp->d_name.len;
74 if (namelen < 0) {
75 break;
76 } else {
77 full_path[namelen] = '\\';
78 strncpy(full_path + namelen + 1, temp->d_name.name,
79 temp->d_name.len);
80 cFYI(0, (" name: %s ", full_path + namelen));
81 }
82 temp = temp->d_parent;
83 if(temp == NULL) {
84 cERROR(1,("corrupt dentry"));
85 kfree(full_path);
86 return NULL;
87 }
88 }
89 if (namelen != 0) {
90 cERROR(1,
91 ("We did not end path lookup where we expected namelen is %d",
92 namelen));
93 /* presumably this is only possible if we were racing with a rename
94 of one of the parent directories (we can not lock the dentries
95 above us to prevent this, but retrying should be harmless) */
96 kfree(full_path);
97 namelen = 0;
98 goto cifs_bp_rename_retry;
99 }
100
101 return full_path;
102 }
103
104 /* Note: caller must free return buffer */
105 char *
106 build_wildcard_path_from_dentry(struct dentry *direntry)
107 {
108 struct dentry *temp;
109 int namelen = 0;
110 char *full_path;
111
112 if(direntry == NULL)
113 return NULL; /* not much we can do if dentry is freed and
114 we need to reopen the file after it was closed implicitly
115 when the server crashed */
116
117 cifs_bwp_rename_retry:
118 for (temp = direntry; !IS_ROOT(temp);) {
119 namelen += (1 + temp->d_name.len);
120 temp = temp->d_parent;
121 if(temp == NULL) {
122 cERROR(1,("corrupt dentry"));
123 return NULL;
124 }
125 }
126
127 full_path = kmalloc(namelen+3, GFP_KERNEL);
128 if(full_path == NULL)
129 return full_path;
130
131 full_path[namelen] = '\\';
132 full_path[namelen+1] = '*';
133 full_path[namelen+2] = 0; /* trailing null */
134
135 for (temp = direntry; !IS_ROOT(temp);) {
136 namelen -= 1 + temp->d_name.len;
137 if (namelen < 0) {
138 break;
139 } else {
140 full_path[namelen] = '\\';
141 strncpy(full_path + namelen + 1, temp->d_name.name,
142 temp->d_name.len);
143 cFYI(0, (" name: %s ", full_path + namelen));
144 }
145 temp = temp->d_parent;
146 if(temp == NULL) {
147 cERROR(1,("corrupt dentry"));
148 kfree(full_path);
149 return NULL;
150 }
151 }
152 if (namelen != 0) {
153 cERROR(1,
154 ("We did not end path lookup where we expected namelen is %d",
155 namelen));
156 /* presumably this is only possible if we were racing with a rename
157 of one of the parent directories (we can not lock the dentries
158 above us to prevent this, but retrying should be harmless) */
159 kfree(full_path);
160 namelen = 0;
161 goto cifs_bwp_rename_retry;
162 }
163
164 return full_path;
165 }
166
167 /* Inode operations in similar order to how they appear in the Linux file fs.h */
168
169 int
170 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
171 struct nameidata *nd)
172 {
173 int rc = -ENOENT;
174 int xid;
175 int oplock = 0;
176 int desiredAccess = GENERIC_READ | GENERIC_WRITE;
177 __u16 fileHandle;
178 struct cifs_sb_info *cifs_sb;
179 struct cifsTconInfo *pTcon;
180 char *full_path = NULL;
181 FILE_ALL_INFO * buf = NULL;
182 struct inode *newinode = NULL;
183 struct cifsFileInfo * pCifsFile = NULL;
184 struct cifsInodeInfo * pCifsInode;
185 int disposition = FILE_OVERWRITE_IF;
186 int write_only = FALSE;
187
188 xid = GetXid();
189
190 cifs_sb = CIFS_SB(inode->i_sb);
191 pTcon = cifs_sb->tcon;
192
193 down(&direntry->d_sb->s_vfs_rename_sem);
194 full_path = build_path_from_dentry(direntry);
195 up(&direntry->d_sb->s_vfs_rename_sem);
196 if(full_path == NULL) {
197 FreeXid(xid);
198 return -ENOMEM;
199 }
200
201 if(nd) {
202 if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
203 desiredAccess = GENERIC_READ;
204 else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
205 desiredAccess = GENERIC_WRITE;
206 write_only = TRUE;
207 } else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
208 /* GENERIC_ALL is too much permission to request */
209 /* can cause unnecessary access denied on create */
210 /* desiredAccess = GENERIC_ALL; */
211 desiredAccess = GENERIC_READ | GENERIC_WRITE;
212 }
213
214 if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
215 disposition = FILE_CREATE;
216 else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
217 disposition = FILE_OVERWRITE_IF;
218 else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
219 disposition = FILE_OPEN_IF;
220 else {
221 cFYI(1,("Create flag not set in create function"));
222 }
223 }
224
225 /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
226 if (oplockEnabled)
227 oplock = REQ_OPLOCK;
228
229 buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
230 if(buf == NULL) {
231 kfree(full_path);
232 FreeXid(xid);
233 return -ENOMEM;
234 }
235
236 rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
237 desiredAccess, CREATE_NOT_DIR,
238 &fileHandle, &oplock, buf, cifs_sb->local_nls);
239 if (rc) {
240 cFYI(1, ("cifs_create returned 0x%x ", rc));
241 } else {
242 /* If Open reported that we actually created a file
243 then we now have to set the mode if possible */
244 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
245 (oplock & CIFS_CREATE_ACTION))
246 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
247 CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
248 (__u64)current->euid,
249 (__u64)current->egid,
250 0 /* dev */,
251 cifs_sb->local_nls);
252 } else {
253 CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
254 (__u64)-1,
255 (__u64)-1,
256 0 /* dev */,
257 cifs_sb->local_nls);
258 }
259 else {
260 /* BB implement via Windows security descriptors */
261 /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
262 /* could set r/o dos attribute if mode & 0222 == 0 */
263 }
264
265 /* BB server might mask mode so we have to query for Unix case*/
266 if (pTcon->ses->capabilities & CAP_UNIX)
267 rc = cifs_get_inode_info_unix(&newinode, full_path,
268 inode->i_sb,xid);
269 else {
270 rc = cifs_get_inode_info(&newinode, full_path,
271 buf, inode->i_sb,xid);
272 if(newinode)
273 newinode->i_mode = mode;
274 }
275
276 if (rc != 0) {
277 cFYI(1,("Create worked but get_inode_info failed with rc = %d",
278 rc));
279 } else {
280 direntry->d_op = &cifs_dentry_ops;
281 d_instantiate(direntry, newinode);
282 }
283 if((nd->flags & LOOKUP_OPEN) == FALSE) {
284 /* mknod case - do not leave file open */
285 CIFSSMBClose(xid, pTcon, fileHandle);
286 } else if(newinode) {
287 pCifsFile = (struct cifsFileInfo *)
288 kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
289
290 if (pCifsFile) {
291 memset((char *)pCifsFile, 0,
292 sizeof (struct cifsFileInfo));
293 pCifsFile->netfid = fileHandle;
294 pCifsFile->pid = current->tgid;
295 pCifsFile->pInode = newinode;
296 pCifsFile->invalidHandle = FALSE;
297 pCifsFile->closePend = FALSE;
298 init_MUTEX(&pCifsFile->fh_sem);
299 /* put the following in at open now */
300 /* pCifsFile->pfile = file; */
301 write_lock(&GlobalSMBSeslock);
302 list_add(&pCifsFile->tlist,&pTcon->openFileList);
303 pCifsInode = CIFS_I(newinode);
304 if(pCifsInode) {
305 /* if readable file instance put first in list*/
306 if (write_only == TRUE) {
307 list_add_tail(&pCifsFile->flist,
308 &pCifsInode->openFileList);
309 } else {
310 list_add(&pCifsFile->flist,
311 &pCifsInode->openFileList);
312 }
313 if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
314 pCifsInode->clientCanCacheAll = TRUE;
315 pCifsInode->clientCanCacheRead = TRUE;
316 cFYI(1,("Exclusive Oplock granted on inode %p",
317 newinode));
318 } else if((oplock & 0xF) == OPLOCK_READ)
319 pCifsInode->clientCanCacheRead = TRUE;
320 }
321 write_unlock(&GlobalSMBSeslock);
322 }
323 }
324 }
325
326 if (buf)
327 kfree(buf);
328 if (full_path)
329 kfree(full_path);
330 FreeXid(xid);
331
332 return rc;
333 }
334
335 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t device_number)
336 {
337 int rc = -EPERM;
338 int xid;
339 struct cifs_sb_info *cifs_sb;
340 struct cifsTconInfo *pTcon;
341 char *full_path = NULL;
342 struct inode * newinode = NULL;
343
344 if (!old_valid_dev(device_number))
345 return -EINVAL;
346
347 xid = GetXid();
348
349 cifs_sb = CIFS_SB(inode->i_sb);
350 pTcon = cifs_sb->tcon;
351
352 down(&direntry->d_sb->s_vfs_rename_sem);
353 full_path = build_path_from_dentry(direntry);
354 up(&direntry->d_sb->s_vfs_rename_sem);
355 if(full_path == NULL)
356 rc = -ENOMEM;
357
358 if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
359 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
360 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
361 mode,(__u64)current->euid,(__u64)current->egid,
362 device_number, cifs_sb->local_nls);
363 } else {
364 rc = CIFSSMBUnixSetPerms(xid, pTcon,
365 full_path, mode, (__u64)-1, (__u64)-1,
366 device_number, cifs_sb->local_nls);
367 }
368
369 if(!rc) {
370 rc = cifs_get_inode_info_unix(&newinode, full_path,
371 inode->i_sb,xid);
372 direntry->d_op = &cifs_dentry_ops;
373 if(rc == 0)
374 d_instantiate(direntry, newinode);
375 }
376 }
377
378 if (full_path)
379 kfree(full_path);
380 FreeXid(xid);
381
382 return rc;
383 }
384
385
386 struct dentry *
387 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
388 {
389 int xid;
390 int rc = 0; /* to get around spurious gcc warning, set to zero here */
391 struct cifs_sb_info *cifs_sb;
392 struct cifsTconInfo *pTcon;
393 struct inode *newInode = NULL;
394 char *full_path = NULL;
395
396 xid = GetXid();
397
398 cFYI(1,
399 (" parent inode = 0x%p name is: %s and dentry = 0x%p",
400 parent_dir_inode, direntry->d_name.name, direntry));
401
402 /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
403
404 /* check whether path exists */
405
406 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
407 pTcon = cifs_sb->tcon;
408
409 /* can not grab the rename sem here since it would
410 deadlock in the cases (beginning of sys_rename itself)
411 in which we already have the sb rename sem */
412 full_path = build_path_from_dentry(direntry);
413 if(full_path == NULL) {
414 FreeXid(xid);
415 return ERR_PTR(-ENOMEM);
416 }
417
418 if (direntry->d_inode != NULL) {
419 cFYI(1, (" non-NULL inode in lookup"));
420 } else {
421 cFYI(1, (" NULL inode in lookup"));
422 }
423 cFYI(1,
424 (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
425
426 if (pTcon->ses->capabilities & CAP_UNIX)
427 rc = cifs_get_inode_info_unix(&newInode, full_path,
428 parent_dir_inode->i_sb,xid);
429 else
430 rc = cifs_get_inode_info(&newInode, full_path, NULL,
431 parent_dir_inode->i_sb,xid);
432
433 if ((rc == 0) && (newInode != NULL)) {
434 direntry->d_op = &cifs_dentry_ops;
435 d_add(direntry, newInode);
436
437 /* since paths are not looked up by component - the parent directories are presumed to be good here */
438 renew_parental_timestamps(direntry);
439
440 } else if (rc == -ENOENT) {
441 rc = 0;
442 d_add(direntry, NULL);
443 } else {
444 cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
445 /* BB special case check for Access Denied - watch security
446 exposure of returning dir info implicitly via different rc
447 if file exists or not but no access BB */
448 }
449
450 if (full_path)
451 kfree(full_path);
452 FreeXid(xid);
453 return ERR_PTR(rc);
454 }
455
456 int
457 cifs_dir_open(struct inode *inode, struct file *file)
458 { /* NB: currently unused since searches are opened in readdir */
459 int rc = 0;
460 int xid;
461 struct cifs_sb_info *cifs_sb;
462 struct cifsTconInfo *pTcon;
463 char *full_path = NULL;
464
465 xid = GetXid();
466
467 cifs_sb = CIFS_SB(inode->i_sb);
468 pTcon = cifs_sb->tcon;
469
470 if(file->f_dentry) {
471 down(&file->f_dentry->d_sb->s_vfs_rename_sem);
472 full_path = build_wildcard_path_from_dentry(file->f_dentry);
473 up(&file->f_dentry->d_sb->s_vfs_rename_sem);
474 } else {
475 FreeXid(xid);
476 return -EIO;
477 }
478
479 cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));
480
481 if (full_path)
482 kfree(full_path);
483 FreeXid(xid);
484 return rc;
485 }
486
487 static int
488 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
489 {
490 int isValid = 1;
491
492 /* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */
493
494 if (direntry->d_inode) {
495 if (cifs_revalidate(direntry)) {
496 /* unlock_kernel(); */
497 return 0;
498 }
499 } else {
500 cFYI(1,
501 ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
502 direntry->d_name.name, direntry));
503 }
504
505 /* unlock_kernel(); */
506
507 return isValid;
508 }
509
510 /* static int cifs_d_delete(struct dentry *direntry)
511 {
512 int rc = 0;
513
514 cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
515
516 return rc;
517 } */
518
519 struct dentry_operations cifs_dentry_ops = {
520 .d_revalidate = cifs_d_revalidate,
521 /* d_delete: cifs_d_delete, *//* not needed except for debugging */
522 /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
523 };
524
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