4 * vfs operations that deal with dentries
6 * Copyright (C) International Business Machines Corp., 2002,2003
7 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
24 #include <linux/stat.h>
25 #include <linux/slab.h>
26 #include <linux/namei.h>
30 #include "cifsproto.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
35 renew_parental_timestamps(struct dentry
*direntry
)
37 /* BB check if there is a way to get the kernel to do this or if we really need this */
39 direntry
->d_time
= jiffies
;
40 direntry
= direntry
->d_parent
;
41 } while (!IS_ROOT(direntry
));
44 /* Note: caller must free return buffer */
46 build_path_from_dentry(struct dentry
*direntry
)
51 char dirsep
= CIFS_DIR_SEP(CIFS_SB(direntry
->d_sb
));
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 */
59 for (temp
= direntry
; !IS_ROOT(temp
);) {
60 namelen
+= (1 + temp
->d_name
.len
);
61 temp
= temp
->d_parent
;
63 cERROR(1,("corrupt dentry"));
68 full_path
= kmalloc(namelen
+1, GFP_KERNEL
);
71 full_path
[namelen
] = 0; /* trailing null */
73 for (temp
= direntry
; !IS_ROOT(temp
);) {
74 namelen
-= 1 + temp
->d_name
.len
;
78 full_path
[namelen
] = dirsep
;
79 strncpy(full_path
+ namelen
+ 1, temp
->d_name
.name
,
81 cFYI(0, (" name: %s ", full_path
+ namelen
));
83 temp
= temp
->d_parent
;
85 cERROR(1,("corrupt dentry"));
92 ("We did not end path lookup where we expected namelen is %d",
94 /* presumably this is only possible if we were racing with a rename
95 of one of the parent directories (we can not lock the dentries
96 above us to prevent this, but retrying should be harmless) */
99 goto cifs_bp_rename_retry
;
105 /* char * build_wildcard_path_from_dentry(struct dentry *direntry)
107 if(full_path == NULL)
110 full_path[namelen] = '\\';
111 full_path[namelen+1] = '*';
112 full_path[namelen+2] = 0;
113 BB remove above eight lines BB */
115 /* Inode operations in similar order to how they appear in the Linux file fs.h */
118 cifs_create(struct inode
*inode
, struct dentry
*direntry
, int mode
,
119 struct nameidata
*nd
)
124 int desiredAccess
= GENERIC_READ
| GENERIC_WRITE
;
126 struct cifs_sb_info
*cifs_sb
;
127 struct cifsTconInfo
*pTcon
;
128 char *full_path
= NULL
;
129 FILE_ALL_INFO
* buf
= NULL
;
130 struct inode
*newinode
= NULL
;
131 struct cifsFileInfo
* pCifsFile
= NULL
;
132 struct cifsInodeInfo
* pCifsInode
;
133 int disposition
= FILE_OVERWRITE_IF
;
134 int write_only
= FALSE
;
138 cifs_sb
= CIFS_SB(inode
->i_sb
);
139 pTcon
= cifs_sb
->tcon
;
141 down(&direntry
->d_sb
->s_vfs_rename_sem
);
142 full_path
= build_path_from_dentry(direntry
);
143 up(&direntry
->d_sb
->s_vfs_rename_sem
);
144 if(full_path
== NULL
) {
149 if(nd
&& (nd
->flags
& LOOKUP_OPEN
)) {
150 int oflags
= nd
->intent
.open
.flags
;
153 if (oflags
& FMODE_READ
)
154 desiredAccess
|= GENERIC_READ
;
155 if (oflags
& FMODE_WRITE
) {
156 desiredAccess
|= GENERIC_WRITE
;
157 if (!(oflags
& FMODE_READ
))
161 if((oflags
& (O_CREAT
| O_EXCL
)) == (O_CREAT
| O_EXCL
))
162 disposition
= FILE_CREATE
;
163 else if((oflags
& (O_CREAT
| O_TRUNC
)) == (O_CREAT
| O_TRUNC
))
164 disposition
= FILE_OVERWRITE_IF
;
165 else if((oflags
& O_CREAT
) == O_CREAT
)
166 disposition
= FILE_OPEN_IF
;
168 cFYI(1,("Create flag not set in create function"));
172 /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
176 buf
= kmalloc(sizeof(FILE_ALL_INFO
),GFP_KERNEL
);
183 rc
= CIFSSMBOpen(xid
, pTcon
, full_path
, disposition
,
184 desiredAccess
, CREATE_NOT_DIR
,
185 &fileHandle
, &oplock
, buf
, cifs_sb
->local_nls
,
186 cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
);
188 /* old server, retry the open legacy style */
189 rc
= SMBLegacyOpen(xid
, pTcon
, full_path
, disposition
,
190 desiredAccess
, CREATE_NOT_DIR
,
191 &fileHandle
, &oplock
, buf
, cifs_sb
->local_nls
,
192 cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
);
195 cFYI(1, ("cifs_create returned 0x%x ", rc
));
197 /* If Open reported that we actually created a file
198 then we now have to set the mode if possible */
199 if ((cifs_sb
->tcon
->ses
->capabilities
& CAP_UNIX
) &&
200 (oplock
& CIFS_CREATE_ACTION
))
201 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
) {
202 CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
, mode
,
203 (__u64
)current
->euid
,
204 (__u64
)current
->egid
,
207 cifs_sb
->mnt_cifs_flags
&
208 CIFS_MOUNT_MAP_SPECIAL_CHR
);
210 CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
, mode
,
215 cifs_sb
->mnt_cifs_flags
&
216 CIFS_MOUNT_MAP_SPECIAL_CHR
);
219 /* BB implement mode setting via Windows security descriptors */
220 /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
221 /* could set r/o dos attribute if mode & 0222 == 0 */
224 /* BB server might mask mode so we have to query for Unix case*/
225 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
226 rc
= cifs_get_inode_info_unix(&newinode
, full_path
,
229 rc
= cifs_get_inode_info(&newinode
, full_path
,
230 buf
, inode
->i_sb
,xid
);
232 newinode
->i_mode
= mode
;
237 ("Create worked but get_inode_info failed rc = %d",
241 direntry
->d_op
= &cifs_ci_dentry_ops
;
243 direntry
->d_op
= &cifs_dentry_ops
;
244 d_instantiate(direntry
, newinode
);
246 if((nd
->flags
& LOOKUP_OPEN
) == FALSE
) {
247 /* mknod case - do not leave file open */
248 CIFSSMBClose(xid
, pTcon
, fileHandle
);
249 } else if(newinode
) {
251 kmalloc(sizeof (struct cifsFileInfo
), GFP_KERNEL
);
253 if(pCifsFile
== NULL
)
254 goto cifs_create_out
;
255 memset((char *)pCifsFile
, 0,
256 sizeof (struct cifsFileInfo
));
257 pCifsFile
->netfid
= fileHandle
;
258 pCifsFile
->pid
= current
->tgid
;
259 pCifsFile
->pInode
= newinode
;
260 pCifsFile
->invalidHandle
= FALSE
;
261 pCifsFile
->closePend
= FALSE
;
262 init_MUTEX(&pCifsFile
->fh_sem
);
263 /* set the following in open now
264 pCifsFile->pfile = file; */
265 write_lock(&GlobalSMBSeslock
);
266 list_add(&pCifsFile
->tlist
,&pTcon
->openFileList
);
267 pCifsInode
= CIFS_I(newinode
);
269 /* if readable file instance put first in list*/
270 if (write_only
== TRUE
) {
271 list_add_tail(&pCifsFile
->flist
,
272 &pCifsInode
->openFileList
);
274 list_add(&pCifsFile
->flist
,
275 &pCifsInode
->openFileList
);
277 if((oplock
& 0xF) == OPLOCK_EXCLUSIVE
) {
278 pCifsInode
->clientCanCacheAll
= TRUE
;
279 pCifsInode
->clientCanCacheRead
= TRUE
;
280 cFYI(1,("Exclusive Oplock for inode %p",
282 } else if((oplock
& 0xF) == OPLOCK_READ
)
283 pCifsInode
->clientCanCacheRead
= TRUE
;
285 write_unlock(&GlobalSMBSeslock
);
295 int cifs_mknod(struct inode
*inode
, struct dentry
*direntry
, int mode
, dev_t device_number
)
299 struct cifs_sb_info
*cifs_sb
;
300 struct cifsTconInfo
*pTcon
;
301 char *full_path
= NULL
;
302 struct inode
* newinode
= NULL
;
304 if (!old_valid_dev(device_number
))
309 cifs_sb
= CIFS_SB(inode
->i_sb
);
310 pTcon
= cifs_sb
->tcon
;
312 down(&direntry
->d_sb
->s_vfs_rename_sem
);
313 full_path
= build_path_from_dentry(direntry
);
314 up(&direntry
->d_sb
->s_vfs_rename_sem
);
315 if(full_path
== NULL
)
317 else if (pTcon
->ses
->capabilities
& CAP_UNIX
) {
318 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
) {
319 rc
= CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
,
320 mode
,(__u64
)current
->euid
,(__u64
)current
->egid
,
321 device_number
, cifs_sb
->local_nls
,
322 cifs_sb
->mnt_cifs_flags
&
323 CIFS_MOUNT_MAP_SPECIAL_CHR
);
325 rc
= CIFSSMBUnixSetPerms(xid
, pTcon
,
326 full_path
, mode
, (__u64
)-1, (__u64
)-1,
327 device_number
, cifs_sb
->local_nls
,
328 cifs_sb
->mnt_cifs_flags
&
329 CIFS_MOUNT_MAP_SPECIAL_CHR
);
333 rc
= cifs_get_inode_info_unix(&newinode
, full_path
,
336 direntry
->d_op
= &cifs_ci_dentry_ops
;
338 direntry
->d_op
= &cifs_dentry_ops
;
340 d_instantiate(direntry
, newinode
);
343 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
) {
348 cFYI(1,("sfu compat create special file"));
350 buf
= kmalloc(sizeof(FILE_ALL_INFO
),GFP_KERNEL
);
357 rc
= CIFSSMBOpen(xid
, pTcon
, full_path
,
358 FILE_CREATE
, /* fail if exists */
359 GENERIC_WRITE
/* BB would
360 WRITE_OWNER | WRITE_DAC be better? */,
361 /* Create a file and set the
362 file attribute to SYSTEM */
363 CREATE_NOT_DIR
| CREATE_OPTION_SPECIAL
,
364 &fileHandle
, &oplock
, buf
,
366 cifs_sb
->mnt_cifs_flags
&
367 CIFS_MOUNT_MAP_SPECIAL_CHR
);
370 /* BB Do not bother to decode buf since no
371 local inode yet to put timestamps in */
372 CIFSSMBClose(xid
, pTcon
, fileHandle
);
376 /* add code here to set EAs */
387 cifs_lookup(struct inode
*parent_dir_inode
, struct dentry
*direntry
, struct nameidata
*nd
)
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
;
399 (" parent inode = 0x%p name is: %s and dentry = 0x%p",
400 parent_dir_inode
, direntry
->d_name
.name
, direntry
));
402 /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
404 /* check whether path exists */
406 cifs_sb
= CIFS_SB(parent_dir_inode
->i_sb
);
407 pTcon
= cifs_sb
->tcon
;
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
) {
415 return ERR_PTR(-ENOMEM
);
418 if (direntry
->d_inode
!= NULL
) {
419 cFYI(1, (" non-NULL inode in lookup"));
421 cFYI(1, (" NULL inode in lookup"));
424 (" Full path: %s inode = 0x%p", full_path
, direntry
->d_inode
));
426 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
427 rc
= cifs_get_inode_info_unix(&newInode
, full_path
,
428 parent_dir_inode
->i_sb
,xid
);
430 rc
= cifs_get_inode_info(&newInode
, full_path
, NULL
,
431 parent_dir_inode
->i_sb
,xid
);
433 if ((rc
== 0) && (newInode
!= NULL
)) {
435 direntry
->d_op
= &cifs_ci_dentry_ops
;
437 direntry
->d_op
= &cifs_dentry_ops
;
438 d_add(direntry
, newInode
);
440 /* since paths are not looked up by component - the parent directories are presumed to be good here */
441 renew_parental_timestamps(direntry
);
443 } else if (rc
== -ENOENT
) {
445 d_add(direntry
, NULL
);
447 cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
449 /* BB special case check for Access Denied - watch security
450 exposure of returning dir info implicitly via different rc
451 if file exists or not but no access BB */
460 cifs_d_revalidate(struct dentry
*direntry
, struct nameidata
*nd
)
464 /* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */
466 if (direntry
->d_inode
) {
467 if (cifs_revalidate(direntry
)) {
468 /* unlock_kernel(); */
473 ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
474 direntry
->d_name
.name
, direntry
));
477 /* unlock_kernel(); */
482 /* static int cifs_d_delete(struct dentry *direntry)
486 cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
491 struct dentry_operations cifs_dentry_ops
= {
492 .d_revalidate
= cifs_d_revalidate
,
493 /* d_delete: cifs_d_delete, *//* not needed except for debugging */
494 /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
497 static int cifs_ci_hash(struct dentry
*dentry
, struct qstr
*q
)
499 struct nls_table
*codepage
= CIFS_SB(dentry
->d_inode
->i_sb
)->local_nls
;
503 hash
= init_name_hash();
504 for (i
= 0; i
< q
->len
; i
++)
505 hash
= partial_name_hash(nls_tolower(codepage
, q
->name
[i
]),
507 q
->hash
= end_name_hash(hash
);
512 static int cifs_ci_compare(struct dentry
*dentry
, struct qstr
*a
,
515 struct nls_table
*codepage
= CIFS_SB(dentry
->d_inode
->i_sb
)->local_nls
;
517 if ((a
->len
== b
->len
) &&
518 (nls_strnicmp(codepage
, a
->name
, b
->name
, a
->len
) == 0)) {
520 * To preserve case, don't let an existing negative dentry's
521 * case take precedence. If a is not a negative dentry, this
522 * should have no side effects
524 memcpy((unsigned char *)a
->name
, b
->name
, a
->len
);
530 struct dentry_operations cifs_ci_dentry_ops
= {
531 .d_revalidate
= cifs_d_revalidate
,
532 .d_hash
= cifs_ci_hash
,
533 .d_compare
= cifs_ci_compare
,