ia64/linux-2.6.18-xen.hg

view fs/cifs/dir.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * fs/cifs/dir.c
3 *
4 * vfs operations that deal with dentries
5 *
6 * Copyright (C) International Business Machines Corp., 2002,2005
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"
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 }
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 char dirsep;
53 if(direntry == NULL)
54 return NULL; /* not much we can do if dentry is freed and
55 we need to reopen the file after it was closed implicitly
56 when the server crashed */
58 dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
59 cifs_bp_rename_retry:
60 for (temp = direntry; !IS_ROOT(temp);) {
61 namelen += (1 + temp->d_name.len);
62 temp = temp->d_parent;
63 if(temp == NULL) {
64 cERROR(1,("corrupt dentry"));
65 return NULL;
66 }
67 }
69 full_path = kmalloc(namelen+1, GFP_KERNEL);
70 if(full_path == NULL)
71 return full_path;
72 full_path[namelen] = 0; /* trailing null */
74 for (temp = direntry; !IS_ROOT(temp);) {
75 namelen -= 1 + temp->d_name.len;
76 if (namelen < 0) {
77 break;
78 } else {
79 full_path[namelen] = dirsep;
80 strncpy(full_path + namelen + 1, temp->d_name.name,
81 temp->d_name.len);
82 cFYI(0, (" name: %s ", full_path + namelen));
83 }
84 temp = temp->d_parent;
85 if(temp == NULL) {
86 cERROR(1,("corrupt dentry"));
87 kfree(full_path);
88 return NULL;
89 }
90 }
91 if (namelen != 0) {
92 cERROR(1,
93 ("We did not end path lookup where we expected namelen is %d",
94 namelen));
95 /* presumably this is only possible if we were racing with a rename
96 of one of the parent directories (we can not lock the dentries
97 above us to prevent this, but retrying should be harmless) */
98 kfree(full_path);
99 namelen = 0;
100 goto cifs_bp_rename_retry;
101 }
103 return full_path;
104 }
106 /* char * build_wildcard_path_from_dentry(struct dentry *direntry)
107 {
108 if(full_path == NULL)
109 return full_path;
111 full_path[namelen] = '\\';
112 full_path[namelen+1] = '*';
113 full_path[namelen+2] = 0;
114 BB remove above eight lines BB */
116 /* Inode operations in similar order to how they appear in Linux file fs.h */
118 int
119 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
120 struct nameidata *nd)
121 {
122 int rc = -ENOENT;
123 int xid;
124 int oplock = 0;
125 int desiredAccess = GENERIC_READ | GENERIC_WRITE;
126 __u16 fileHandle;
127 struct cifs_sb_info *cifs_sb;
128 struct cifsTconInfo *pTcon;
129 char *full_path = NULL;
130 FILE_ALL_INFO * buf = NULL;
131 struct inode *newinode = NULL;
132 struct cifsFileInfo * pCifsFile = NULL;
133 struct cifsInodeInfo * pCifsInode;
134 int disposition = FILE_OVERWRITE_IF;
135 int write_only = FALSE;
137 xid = GetXid();
139 cifs_sb = CIFS_SB(inode->i_sb);
140 pTcon = cifs_sb->tcon;
142 full_path = build_path_from_dentry(direntry);
143 if(full_path == NULL) {
144 FreeXid(xid);
145 return -ENOMEM;
146 }
148 if(nd && (nd->flags & LOOKUP_OPEN)) {
149 int oflags = nd->intent.open.flags;
151 desiredAccess = 0;
152 if (oflags & FMODE_READ)
153 desiredAccess |= GENERIC_READ;
154 if (oflags & FMODE_WRITE) {
155 desiredAccess |= GENERIC_WRITE;
156 if (!(oflags & FMODE_READ))
157 write_only = TRUE;
158 }
160 if((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
161 disposition = FILE_CREATE;
162 else if((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
163 disposition = FILE_OVERWRITE_IF;
164 else if((oflags & O_CREAT) == O_CREAT)
165 disposition = FILE_OPEN_IF;
166 else {
167 cFYI(1,("Create flag not set in create function"));
168 }
169 }
171 /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
172 if (oplockEnabled)
173 oplock = REQ_OPLOCK;
175 buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
176 if(buf == NULL) {
177 kfree(full_path);
178 FreeXid(xid);
179 return -ENOMEM;
180 }
181 if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
182 rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
183 desiredAccess, CREATE_NOT_DIR,
184 &fileHandle, &oplock, buf, cifs_sb->local_nls,
185 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
186 else
187 rc = -EIO; /* no NT SMB support fall into legacy open below */
189 if(rc == -EIO) {
190 /* old server, retry the open legacy style */
191 rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
192 desiredAccess, CREATE_NOT_DIR,
193 &fileHandle, &oplock, buf, cifs_sb->local_nls,
194 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
195 }
196 if (rc) {
197 cFYI(1, ("cifs_create returned 0x%x", rc));
198 } else {
199 /* If Open reported that we actually created a file
200 then we now have to set the mode if possible */
201 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
202 (oplock & CIFS_CREATE_ACTION))
203 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
204 CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
205 (__u64)current->fsuid,
206 (__u64)current->fsgid,
207 0 /* dev */,
208 cifs_sb->local_nls,
209 cifs_sb->mnt_cifs_flags &
210 CIFS_MOUNT_MAP_SPECIAL_CHR);
211 } else {
212 CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
213 (__u64)-1,
214 (__u64)-1,
215 0 /* dev */,
216 cifs_sb->local_nls,
217 cifs_sb->mnt_cifs_flags &
218 CIFS_MOUNT_MAP_SPECIAL_CHR);
219 }
220 else {
221 /* BB implement mode setting via Windows security descriptors */
222 /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
223 /* could set r/o dos attribute if mode & 0222 == 0 */
224 }
226 /* BB server might mask mode so we have to query for Unix case*/
227 if (pTcon->ses->capabilities & CAP_UNIX)
228 rc = cifs_get_inode_info_unix(&newinode, full_path,
229 inode->i_sb,xid);
230 else {
231 rc = cifs_get_inode_info(&newinode, full_path,
232 buf, inode->i_sb,xid);
233 if(newinode) {
234 newinode->i_mode = mode;
235 if((oplock & CIFS_CREATE_ACTION) &&
236 (cifs_sb->mnt_cifs_flags &
237 CIFS_MOUNT_SET_UID)) {
238 newinode->i_uid = current->fsuid;
239 newinode->i_gid = current->fsgid;
240 }
241 }
242 }
244 if (rc != 0) {
245 cFYI(1,
246 ("Create worked but get_inode_info failed rc = %d",
247 rc));
248 } else {
249 if (pTcon->nocase)
250 direntry->d_op = &cifs_ci_dentry_ops;
251 else
252 direntry->d_op = &cifs_dentry_ops;
253 d_instantiate(direntry, newinode);
254 }
255 if((nd->flags & LOOKUP_OPEN) == FALSE) {
256 /* mknod case - do not leave file open */
257 CIFSSMBClose(xid, pTcon, fileHandle);
258 } else if(newinode) {
259 pCifsFile =
260 kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
262 if(pCifsFile == NULL)
263 goto cifs_create_out;
264 pCifsFile->netfid = fileHandle;
265 pCifsFile->pid = current->tgid;
266 pCifsFile->pInode = newinode;
267 pCifsFile->invalidHandle = FALSE;
268 pCifsFile->closePend = FALSE;
269 init_MUTEX(&pCifsFile->fh_sem);
270 init_MUTEX(&pCifsFile->lock_sem);
271 INIT_LIST_HEAD(&pCifsFile->llist);
272 atomic_set(&pCifsFile->wrtPending,0);
274 /* set the following in open now
275 pCifsFile->pfile = file; */
276 write_lock(&GlobalSMBSeslock);
277 list_add(&pCifsFile->tlist,&pTcon->openFileList);
278 pCifsInode = CIFS_I(newinode);
279 if(pCifsInode) {
280 /* if readable file instance put first in list*/
281 if (write_only == TRUE) {
282 list_add_tail(&pCifsFile->flist,
283 &pCifsInode->openFileList);
284 } else {
285 list_add(&pCifsFile->flist,
286 &pCifsInode->openFileList);
287 }
288 if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
289 pCifsInode->clientCanCacheAll = TRUE;
290 pCifsInode->clientCanCacheRead = TRUE;
291 cFYI(1,("Exclusive Oplock for inode %p",
292 newinode));
293 } else if((oplock & 0xF) == OPLOCK_READ)
294 pCifsInode->clientCanCacheRead = TRUE;
295 }
296 write_unlock(&GlobalSMBSeslock);
297 }
298 }
299 cifs_create_out:
300 kfree(buf);
301 kfree(full_path);
302 FreeXid(xid);
303 return rc;
304 }
306 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
307 dev_t device_number)
308 {
309 int rc = -EPERM;
310 int xid;
311 struct cifs_sb_info *cifs_sb;
312 struct cifsTconInfo *pTcon;
313 char *full_path = NULL;
314 struct inode * newinode = NULL;
316 if (!old_valid_dev(device_number))
317 return -EINVAL;
319 xid = GetXid();
321 cifs_sb = CIFS_SB(inode->i_sb);
322 pTcon = cifs_sb->tcon;
324 full_path = build_path_from_dentry(direntry);
325 if(full_path == NULL)
326 rc = -ENOMEM;
327 else if (pTcon->ses->capabilities & CAP_UNIX) {
328 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
329 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
330 mode,(__u64)current->fsuid,(__u64)current->fsgid,
331 device_number, cifs_sb->local_nls,
332 cifs_sb->mnt_cifs_flags &
333 CIFS_MOUNT_MAP_SPECIAL_CHR);
334 } else {
335 rc = CIFSSMBUnixSetPerms(xid, pTcon,
336 full_path, mode, (__u64)-1, (__u64)-1,
337 device_number, cifs_sb->local_nls,
338 cifs_sb->mnt_cifs_flags &
339 CIFS_MOUNT_MAP_SPECIAL_CHR);
340 }
342 if(!rc) {
343 rc = cifs_get_inode_info_unix(&newinode, full_path,
344 inode->i_sb,xid);
345 if (pTcon->nocase)
346 direntry->d_op = &cifs_ci_dentry_ops;
347 else
348 direntry->d_op = &cifs_dentry_ops;
349 if(rc == 0)
350 d_instantiate(direntry, newinode);
351 }
352 } else {
353 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
354 int oplock = 0;
355 u16 fileHandle;
356 FILE_ALL_INFO * buf;
358 cFYI(1,("sfu compat create special file"));
360 buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
361 if(buf == NULL) {
362 kfree(full_path);
363 FreeXid(xid);
364 return -ENOMEM;
365 }
367 rc = CIFSSMBOpen(xid, pTcon, full_path,
368 FILE_CREATE, /* fail if exists */
369 GENERIC_WRITE /* BB would
370 WRITE_OWNER | WRITE_DAC be better? */,
371 /* Create a file and set the
372 file attribute to SYSTEM */
373 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
374 &fileHandle, &oplock, buf,
375 cifs_sb->local_nls,
376 cifs_sb->mnt_cifs_flags &
377 CIFS_MOUNT_MAP_SPECIAL_CHR);
379 /* BB FIXME - add handling for backlevel servers
380 which need legacy open and check for all
381 calls to SMBOpen for fallback to
382 SMBLeagcyOpen */
383 if(!rc) {
384 /* BB Do not bother to decode buf since no
385 local inode yet to put timestamps in,
386 but we can reuse it safely */
387 int bytes_written;
388 struct win_dev *pdev;
389 pdev = (struct win_dev *)buf;
390 if(S_ISCHR(mode)) {
391 memcpy(pdev->type, "IntxCHR", 8);
392 pdev->major =
393 cpu_to_le64(MAJOR(device_number));
394 pdev->minor =
395 cpu_to_le64(MINOR(device_number));
396 rc = CIFSSMBWrite(xid, pTcon,
397 fileHandle,
398 sizeof(struct win_dev),
399 0, &bytes_written, (char *)pdev,
400 NULL, 0);
401 } else if(S_ISBLK(mode)) {
402 memcpy(pdev->type, "IntxBLK", 8);
403 pdev->major =
404 cpu_to_le64(MAJOR(device_number));
405 pdev->minor =
406 cpu_to_le64(MINOR(device_number));
407 rc = CIFSSMBWrite(xid, pTcon,
408 fileHandle,
409 sizeof(struct win_dev),
410 0, &bytes_written, (char *)pdev,
411 NULL, 0);
412 } /* else if(S_ISFIFO */
413 CIFSSMBClose(xid, pTcon, fileHandle);
414 d_drop(direntry);
415 }
416 kfree(buf);
417 /* add code here to set EAs */
418 }
419 }
421 kfree(full_path);
422 FreeXid(xid);
423 return rc;
424 }
427 struct dentry *
428 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
429 {
430 int xid;
431 int rc = 0; /* to get around spurious gcc warning, set to zero here */
432 struct cifs_sb_info *cifs_sb;
433 struct cifsTconInfo *pTcon;
434 struct inode *newInode = NULL;
435 char *full_path = NULL;
437 xid = GetXid();
439 cFYI(1,
440 (" parent inode = 0x%p name is: %s and dentry = 0x%p",
441 parent_dir_inode, direntry->d_name.name, direntry));
443 /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
445 /* check whether path exists */
447 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
448 pTcon = cifs_sb->tcon;
450 /*
451 * Don't allow the separator character in a path component.
452 * The VFS will not allow "/", but "\" is allowed by posix.
453 */
454 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
455 int i;
456 for (i = 0; i < direntry->d_name.len; i++)
457 if (direntry->d_name.name[i] == '\\') {
458 cFYI(1, ("Invalid file name"));
459 FreeXid(xid);
460 return ERR_PTR(-EINVAL);
461 }
462 }
464 /* can not grab the rename sem here since it would
465 deadlock in the cases (beginning of sys_rename itself)
466 in which we already have the sb rename sem */
467 full_path = build_path_from_dentry(direntry);
468 if(full_path == NULL) {
469 FreeXid(xid);
470 return ERR_PTR(-ENOMEM);
471 }
473 if (direntry->d_inode != NULL) {
474 cFYI(1, (" non-NULL inode in lookup"));
475 } else {
476 cFYI(1, (" NULL inode in lookup"));
477 }
478 cFYI(1,
479 (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
481 if (pTcon->ses->capabilities & CAP_UNIX)
482 rc = cifs_get_inode_info_unix(&newInode, full_path,
483 parent_dir_inode->i_sb,xid);
484 else
485 rc = cifs_get_inode_info(&newInode, full_path, NULL,
486 parent_dir_inode->i_sb,xid);
488 if ((rc == 0) && (newInode != NULL)) {
489 if (pTcon->nocase)
490 direntry->d_op = &cifs_ci_dentry_ops;
491 else
492 direntry->d_op = &cifs_dentry_ops;
493 d_add(direntry, newInode);
495 /* since paths are not looked up by component - the parent
496 directories are presumed to be good here */
497 renew_parental_timestamps(direntry);
499 } else if (rc == -ENOENT) {
500 rc = 0;
501 direntry->d_time = jiffies;
502 if (pTcon->nocase)
503 direntry->d_op = &cifs_ci_dentry_ops;
504 else
505 direntry->d_op = &cifs_dentry_ops;
506 d_add(direntry, NULL);
507 /* if it was once a directory (but how can we tell?) we could do
508 shrink_dcache_parent(direntry); */
509 } else {
510 cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
511 rc,full_path));
512 /* BB special case check for Access Denied - watch security
513 exposure of returning dir info implicitly via different rc
514 if file exists or not but no access BB */
515 }
517 kfree(full_path);
518 FreeXid(xid);
519 return ERR_PTR(rc);
520 }
522 static int
523 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
524 {
525 int isValid = 1;
527 if (direntry->d_inode) {
528 if (cifs_revalidate(direntry)) {
529 return 0;
530 }
531 } else {
532 cFYI(1, ("neg dentry 0x%p name = %s",
533 direntry, direntry->d_name.name));
534 if(time_after(jiffies, direntry->d_time + HZ) ||
535 !lookupCacheEnabled) {
536 d_drop(direntry);
537 isValid = 0;
538 }
539 }
541 return isValid;
542 }
544 /* static int cifs_d_delete(struct dentry *direntry)
545 {
546 int rc = 0;
548 cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
550 return rc;
551 } */
553 struct dentry_operations cifs_dentry_ops = {
554 .d_revalidate = cifs_d_revalidate,
555 /* d_delete: cifs_d_delete, *//* not needed except for debugging */
556 /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
557 };
559 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
560 {
561 struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
562 unsigned long hash;
563 int i;
565 hash = init_name_hash();
566 for (i = 0; i < q->len; i++)
567 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
568 hash);
569 q->hash = end_name_hash(hash);
571 return 0;
572 }
574 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
575 struct qstr *b)
576 {
577 struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
579 if ((a->len == b->len) &&
580 (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
581 /*
582 * To preserve case, don't let an existing negative dentry's
583 * case take precedence. If a is not a negative dentry, this
584 * should have no side effects
585 */
586 memcpy((unsigned char *)a->name, b->name, a->len);
587 return 0;
588 }
589 return 1;
590 }
592 struct dentry_operations cifs_ci_dentry_ops = {
593 .d_revalidate = cifs_d_revalidate,
594 .d_hash = cifs_ci_hash,
595 .d_compare = cifs_ci_compare,
596 };