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1da177e4 LT |
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 * | |
ac67055e | 46 | build_path_from_dentry(struct dentry *direntry, const struct cifs_sb_info *cifs_sb) |
1da177e4 LT |
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 { | |
ac67055e | 77 | full_path[namelen] = CIFS_DIR_SEP(cifs_sb); |
1da177e4 LT |
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 | ||
737b758c | 104 | /* char * build_wildcard_path_from_dentry(struct dentry *direntry) |
1da177e4 | 105 | { |
1da177e4 LT |
106 | if(full_path == NULL) |
107 | return full_path; | |
108 | ||
109 | full_path[namelen] = '\\'; | |
110 | full_path[namelen+1] = '*'; | |
737b758c SF |
111 | full_path[namelen+2] = 0; |
112 | BB remove above eight lines BB */ | |
1da177e4 LT |
113 | |
114 | /* Inode operations in similar order to how they appear in the Linux file fs.h */ | |
115 | ||
116 | int | |
117 | cifs_create(struct inode *inode, struct dentry *direntry, int mode, | |
118 | struct nameidata *nd) | |
119 | { | |
120 | int rc = -ENOENT; | |
121 | int xid; | |
122 | int oplock = 0; | |
123 | int desiredAccess = GENERIC_READ | GENERIC_WRITE; | |
124 | __u16 fileHandle; | |
125 | struct cifs_sb_info *cifs_sb; | |
126 | struct cifsTconInfo *pTcon; | |
127 | char *full_path = NULL; | |
128 | FILE_ALL_INFO * buf = NULL; | |
129 | struct inode *newinode = NULL; | |
130 | struct cifsFileInfo * pCifsFile = NULL; | |
131 | struct cifsInodeInfo * pCifsInode; | |
132 | int disposition = FILE_OVERWRITE_IF; | |
133 | int write_only = FALSE; | |
134 | ||
135 | xid = GetXid(); | |
136 | ||
137 | cifs_sb = CIFS_SB(inode->i_sb); | |
138 | pTcon = cifs_sb->tcon; | |
139 | ||
140 | down(&direntry->d_sb->s_vfs_rename_sem); | |
ac67055e | 141 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
142 | up(&direntry->d_sb->s_vfs_rename_sem); |
143 | if(full_path == NULL) { | |
144 | FreeXid(xid); | |
145 | return -ENOMEM; | |
146 | } | |
147 | ||
148 | if(nd) { | |
149 | if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY) | |
150 | desiredAccess = GENERIC_READ; | |
151 | else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) { | |
152 | desiredAccess = GENERIC_WRITE; | |
153 | write_only = TRUE; | |
154 | } else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) { | |
155 | /* GENERIC_ALL is too much permission to request */ | |
156 | /* can cause unnecessary access denied on create */ | |
157 | /* desiredAccess = GENERIC_ALL; */ | |
158 | desiredAccess = GENERIC_READ | GENERIC_WRITE; | |
159 | } | |
160 | ||
161 | if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
162 | disposition = FILE_CREATE; | |
163 | else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
164 | disposition = FILE_OVERWRITE_IF; | |
165 | else if((nd->intent.open.flags & O_CREAT) == O_CREAT) | |
166 | disposition = FILE_OPEN_IF; | |
167 | else { | |
168 | cFYI(1,("Create flag not set in create function")); | |
169 | } | |
170 | } | |
171 | ||
172 | /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */ | |
173 | if (oplockEnabled) | |
174 | oplock = REQ_OPLOCK; | |
175 | ||
176 | buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL); | |
177 | if(buf == NULL) { | |
178 | kfree(full_path); | |
179 | FreeXid(xid); | |
180 | return -ENOMEM; | |
181 | } | |
182 | ||
183 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, | |
184 | desiredAccess, CREATE_NOT_DIR, | |
737b758c SF |
185 | &fileHandle, &oplock, buf, cifs_sb->local_nls, |
186 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
187 | if (rc) { |
188 | cFYI(1, ("cifs_create returned 0x%x ", rc)); | |
189 | } else { | |
190 | /* If Open reported that we actually created a file | |
191 | then we now have to set the mode if possible */ | |
192 | if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) && | |
193 | (oplock & CIFS_CREATE_ACTION)) | |
194 | if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { | |
195 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, | |
196 | (__u64)current->euid, | |
197 | (__u64)current->egid, | |
198 | 0 /* dev */, | |
737b758c SF |
199 | cifs_sb->local_nls, |
200 | cifs_sb->mnt_cifs_flags & | |
201 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
202 | } else { |
203 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, | |
204 | (__u64)-1, | |
205 | (__u64)-1, | |
206 | 0 /* dev */, | |
737b758c SF |
207 | cifs_sb->local_nls, |
208 | cifs_sb->mnt_cifs_flags & | |
209 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
210 | } |
211 | else { | |
d7245c2c | 212 | /* BB implement mode setting via Windows security descriptors */ |
1da177e4 LT |
213 | /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/ |
214 | /* could set r/o dos attribute if mode & 0222 == 0 */ | |
215 | } | |
216 | ||
217 | /* BB server might mask mode so we have to query for Unix case*/ | |
218 | if (pTcon->ses->capabilities & CAP_UNIX) | |
219 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
220 | inode->i_sb,xid); | |
221 | else { | |
222 | rc = cifs_get_inode_info(&newinode, full_path, | |
223 | buf, inode->i_sb,xid); | |
224 | if(newinode) | |
225 | newinode->i_mode = mode; | |
226 | } | |
227 | ||
228 | if (rc != 0) { | |
4a6d87f1 SF |
229 | cFYI(1, |
230 | ("Create worked but get_inode_info failed rc = %d", | |
1da177e4 LT |
231 | rc)); |
232 | } else { | |
233 | direntry->d_op = &cifs_dentry_ops; | |
234 | d_instantiate(direntry, newinode); | |
235 | } | |
236 | if((nd->flags & LOOKUP_OPEN) == FALSE) { | |
237 | /* mknod case - do not leave file open */ | |
238 | CIFSSMBClose(xid, pTcon, fileHandle); | |
239 | } else if(newinode) { | |
d14537f1 | 240 | pCifsFile = |
1da177e4 | 241 | kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL); |
d14537f1 SF |
242 | |
243 | if(pCifsFile == NULL) | |
244 | goto cifs_create_out; | |
245 | memset((char *)pCifsFile, 0, | |
246 | sizeof (struct cifsFileInfo)); | |
247 | pCifsFile->netfid = fileHandle; | |
248 | pCifsFile->pid = current->tgid; | |
249 | pCifsFile->pInode = newinode; | |
250 | pCifsFile->invalidHandle = FALSE; | |
251 | pCifsFile->closePend = FALSE; | |
252 | init_MUTEX(&pCifsFile->fh_sem); | |
253 | /* set the following in open now | |
254 | pCifsFile->pfile = file; */ | |
255 | write_lock(&GlobalSMBSeslock); | |
256 | list_add(&pCifsFile->tlist,&pTcon->openFileList); | |
257 | pCifsInode = CIFS_I(newinode); | |
258 | if(pCifsInode) { | |
1da177e4 | 259 | /* if readable file instance put first in list*/ |
d14537f1 SF |
260 | if (write_only == TRUE) { |
261 | list_add_tail(&pCifsFile->flist, | |
262 | &pCifsInode->openFileList); | |
263 | } else { | |
264 | list_add(&pCifsFile->flist, | |
265 | &pCifsInode->openFileList); | |
1da177e4 | 266 | } |
d14537f1 SF |
267 | if((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
268 | pCifsInode->clientCanCacheAll = TRUE; | |
269 | pCifsInode->clientCanCacheRead = TRUE; | |
270 | cFYI(1,("Exclusive Oplock for inode %p", | |
271 | newinode)); | |
272 | } else if((oplock & 0xF) == OPLOCK_READ) | |
273 | pCifsInode->clientCanCacheRead = TRUE; | |
1da177e4 | 274 | } |
d14537f1 | 275 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
276 | } |
277 | } | |
d14537f1 SF |
278 | cifs_create_out: |
279 | kfree(buf); | |
280 | kfree(full_path); | |
1da177e4 | 281 | FreeXid(xid); |
1da177e4 LT |
282 | return rc; |
283 | } | |
284 | ||
285 | int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t device_number) | |
286 | { | |
287 | int rc = -EPERM; | |
288 | int xid; | |
289 | struct cifs_sb_info *cifs_sb; | |
290 | struct cifsTconInfo *pTcon; | |
291 | char *full_path = NULL; | |
292 | struct inode * newinode = NULL; | |
293 | ||
294 | if (!old_valid_dev(device_number)) | |
295 | return -EINVAL; | |
296 | ||
297 | xid = GetXid(); | |
298 | ||
299 | cifs_sb = CIFS_SB(inode->i_sb); | |
300 | pTcon = cifs_sb->tcon; | |
301 | ||
302 | down(&direntry->d_sb->s_vfs_rename_sem); | |
ac67055e | 303 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
304 | up(&direntry->d_sb->s_vfs_rename_sem); |
305 | if(full_path == NULL) | |
306 | rc = -ENOMEM; | |
4a6d87f1 | 307 | else if (pTcon->ses->capabilities & CAP_UNIX) { |
1da177e4 LT |
308 | if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
309 | rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, | |
310 | mode,(__u64)current->euid,(__u64)current->egid, | |
737b758c SF |
311 | device_number, cifs_sb->local_nls, |
312 | cifs_sb->mnt_cifs_flags & | |
313 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
314 | } else { |
315 | rc = CIFSSMBUnixSetPerms(xid, pTcon, | |
316 | full_path, mode, (__u64)-1, (__u64)-1, | |
737b758c SF |
317 | device_number, cifs_sb->local_nls, |
318 | cifs_sb->mnt_cifs_flags & | |
319 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
320 | } |
321 | ||
322 | if(!rc) { | |
323 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
324 | inode->i_sb,xid); | |
325 | direntry->d_op = &cifs_dentry_ops; | |
326 | if(rc == 0) | |
327 | d_instantiate(direntry, newinode); | |
328 | } | |
d7245c2c | 329 | } else { |
eda3c029 SF |
330 | if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) { |
331 | int oplock = 0; | |
332 | u16 fileHandle; | |
333 | FILE_ALL_INFO * buf; | |
d7245c2c SF |
334 | |
335 | cFYI(1,("sfu compat create special file")); | |
d7245c2c | 336 | |
eda3c029 SF |
337 | buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL); |
338 | if(buf == NULL) { | |
339 | kfree(full_path); | |
340 | FreeXid(xid); | |
341 | return -ENOMEM; | |
342 | } | |
343 | ||
344 | rc = CIFSSMBOpen(xid, pTcon, full_path, | |
345 | FILE_CREATE, /* fail if exists */ | |
346 | GENERIC_WRITE /* BB would | |
347 | WRITE_OWNER | WRITE_DAC be better? */, | |
348 | /* Create a file and set the | |
349 | file attribute to SYSTEM */ | |
350 | CREATE_NOT_DIR | CREATE_OPTION_SPECIAL, | |
351 | &fileHandle, &oplock, buf, | |
352 | cifs_sb->local_nls, | |
353 | cifs_sb->mnt_cifs_flags & | |
354 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
355 | ||
356 | if(!rc) { | |
357 | /* BB Do not bother to decode buf since no | |
358 | local inode yet to put timestamps in */ | |
359 | CIFSSMBClose(xid, pTcon, fileHandle); | |
360 | d_drop(direntry); | |
361 | } | |
362 | kfree(buf); | |
d7245c2c SF |
363 | /* add code here to set EAs */ |
364 | } | |
1da177e4 LT |
365 | } |
366 | ||
d14537f1 | 367 | kfree(full_path); |
1da177e4 | 368 | FreeXid(xid); |
1da177e4 LT |
369 | return rc; |
370 | } | |
371 | ||
372 | ||
373 | struct dentry * | |
374 | cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd) | |
375 | { | |
376 | int xid; | |
377 | int rc = 0; /* to get around spurious gcc warning, set to zero here */ | |
378 | struct cifs_sb_info *cifs_sb; | |
379 | struct cifsTconInfo *pTcon; | |
380 | struct inode *newInode = NULL; | |
381 | char *full_path = NULL; | |
382 | ||
383 | xid = GetXid(); | |
384 | ||
385 | cFYI(1, | |
386 | (" parent inode = 0x%p name is: %s and dentry = 0x%p", | |
387 | parent_dir_inode, direntry->d_name.name, direntry)); | |
388 | ||
389 | /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */ | |
390 | ||
391 | /* check whether path exists */ | |
392 | ||
393 | cifs_sb = CIFS_SB(parent_dir_inode->i_sb); | |
394 | pTcon = cifs_sb->tcon; | |
395 | ||
396 | /* can not grab the rename sem here since it would | |
397 | deadlock in the cases (beginning of sys_rename itself) | |
398 | in which we already have the sb rename sem */ | |
ac67055e | 399 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
400 | if(full_path == NULL) { |
401 | FreeXid(xid); | |
402 | return ERR_PTR(-ENOMEM); | |
403 | } | |
404 | ||
405 | if (direntry->d_inode != NULL) { | |
406 | cFYI(1, (" non-NULL inode in lookup")); | |
407 | } else { | |
408 | cFYI(1, (" NULL inode in lookup")); | |
409 | } | |
410 | cFYI(1, | |
411 | (" Full path: %s inode = 0x%p", full_path, direntry->d_inode)); | |
412 | ||
413 | if (pTcon->ses->capabilities & CAP_UNIX) | |
414 | rc = cifs_get_inode_info_unix(&newInode, full_path, | |
415 | parent_dir_inode->i_sb,xid); | |
416 | else | |
417 | rc = cifs_get_inode_info(&newInode, full_path, NULL, | |
418 | parent_dir_inode->i_sb,xid); | |
419 | ||
420 | if ((rc == 0) && (newInode != NULL)) { | |
421 | direntry->d_op = &cifs_dentry_ops; | |
422 | d_add(direntry, newInode); | |
423 | ||
424 | /* since paths are not looked up by component - the parent directories are presumed to be good here */ | |
425 | renew_parental_timestamps(direntry); | |
426 | ||
427 | } else if (rc == -ENOENT) { | |
428 | rc = 0; | |
429 | d_add(direntry, NULL); | |
430 | } else { | |
b2aeb9d5 SF |
431 | cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s", |
432 | rc,full_path)); | |
1da177e4 LT |
433 | /* BB special case check for Access Denied - watch security |
434 | exposure of returning dir info implicitly via different rc | |
435 | if file exists or not but no access BB */ | |
436 | } | |
437 | ||
d14537f1 | 438 | kfree(full_path); |
1da177e4 LT |
439 | FreeXid(xid); |
440 | return ERR_PTR(rc); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | static int |
444 | cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd) | |
445 | { | |
446 | int isValid = 1; | |
447 | ||
448 | /* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */ | |
449 | ||
450 | if (direntry->d_inode) { | |
451 | if (cifs_revalidate(direntry)) { | |
452 | /* unlock_kernel(); */ | |
453 | return 0; | |
454 | } | |
455 | } else { | |
456 | cFYI(1, | |
457 | ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p", | |
458 | direntry->d_name.name, direntry)); | |
459 | } | |
460 | ||
461 | /* unlock_kernel(); */ | |
462 | ||
463 | return isValid; | |
464 | } | |
465 | ||
466 | /* static int cifs_d_delete(struct dentry *direntry) | |
467 | { | |
468 | int rc = 0; | |
469 | ||
470 | cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name)); | |
471 | ||
472 | return rc; | |
473 | } */ | |
474 | ||
475 | struct dentry_operations cifs_dentry_ops = { | |
476 | .d_revalidate = cifs_d_revalidate, | |
477 | /* d_delete: cifs_d_delete, *//* not needed except for debugging */ | |
478 | /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */ | |
479 | }; |