4 * vfs operations that deal with dentries
6 * Copyright (C) International Business Machines Corp., 2002,2005
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
)
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
));
60 for (temp
= direntry
; !IS_ROOT(temp
);) {
61 namelen
+= (1 + temp
->d_name
.len
);
62 temp
= temp
->d_parent
;
64 cERROR(1,("corrupt dentry"));
69 full_path
= kmalloc(namelen
+1, GFP_KERNEL
);
72 full_path
[namelen
] = 0; /* trailing null */
74 for (temp
= direntry
; !IS_ROOT(temp
);) {
75 namelen
-= 1 + temp
->d_name
.len
;
79 full_path
[namelen
] = dirsep
;
80 strncpy(full_path
+ namelen
+ 1, temp
->d_name
.name
,
82 cFYI(0, (" name: %s ", full_path
+ namelen
));
84 temp
= temp
->d_parent
;
86 cERROR(1,("corrupt dentry"));
93 ("We did not end path lookup where we expected namelen is %d",
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) */
100 goto cifs_bp_rename_retry
;
106 /* char * build_wildcard_path_from_dentry(struct dentry *direntry)
108 if(full_path == NULL)
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 the Linux file fs.h */
119 cifs_create(struct inode
*inode
, struct dentry
*direntry
, int mode
,
120 struct nameidata
*nd
)
125 int desiredAccess
= GENERIC_READ
| GENERIC_WRITE
;
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
;
139 cifs_sb
= CIFS_SB(inode
->i_sb
);
140 pTcon
= cifs_sb
->tcon
;
142 mutex_lock(&direntry
->d_sb
->s_vfs_rename_mutex
);
143 full_path
= build_path_from_dentry(direntry
);
144 mutex_unlock(&direntry
->d_sb
->s_vfs_rename_mutex
);
145 if(full_path
== NULL
) {
150 if(nd
&& (nd
->flags
& LOOKUP_OPEN
)) {
151 int oflags
= nd
->intent
.open
.flags
;
154 if (oflags
& FMODE_READ
)
155 desiredAccess
|= GENERIC_READ
;
156 if (oflags
& FMODE_WRITE
) {
157 desiredAccess
|= GENERIC_WRITE
;
158 if (!(oflags
& FMODE_READ
))
162 if((oflags
& (O_CREAT
| O_EXCL
)) == (O_CREAT
| O_EXCL
))
163 disposition
= FILE_CREATE
;
164 else if((oflags
& (O_CREAT
| O_TRUNC
)) == (O_CREAT
| O_TRUNC
))
165 disposition
= FILE_OVERWRITE_IF
;
166 else if((oflags
& O_CREAT
) == O_CREAT
)
167 disposition
= FILE_OPEN_IF
;
169 cFYI(1,("Create flag not set in create function"));
173 /* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
177 buf
= kmalloc(sizeof(FILE_ALL_INFO
),GFP_KERNEL
);
184 rc
= CIFSSMBOpen(xid
, pTcon
, full_path
, disposition
,
185 desiredAccess
, CREATE_NOT_DIR
,
186 &fileHandle
, &oplock
, buf
, cifs_sb
->local_nls
,
187 cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
);
189 /* old server, retry the open legacy style */
190 rc
= SMBLegacyOpen(xid
, pTcon
, full_path
, disposition
,
191 desiredAccess
, CREATE_NOT_DIR
,
192 &fileHandle
, &oplock
, buf
, cifs_sb
->local_nls
,
193 cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
);
196 cFYI(1, ("cifs_create returned 0x%x ", rc
));
198 /* If Open reported that we actually created a file
199 then we now have to set the mode if possible */
200 if ((cifs_sb
->tcon
->ses
->capabilities
& CAP_UNIX
) &&
201 (oplock
& CIFS_CREATE_ACTION
))
202 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
) {
203 CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
, mode
,
204 (__u64
)current
->fsuid
,
205 (__u64
)current
->fsgid
,
208 cifs_sb
->mnt_cifs_flags
&
209 CIFS_MOUNT_MAP_SPECIAL_CHR
);
211 CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
, mode
,
216 cifs_sb
->mnt_cifs_flags
&
217 CIFS_MOUNT_MAP_SPECIAL_CHR
);
220 /* BB implement mode setting via Windows security descriptors */
221 /* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
222 /* could set r/o dos attribute if mode & 0222 == 0 */
225 /* BB server might mask mode so we have to query for Unix case*/
226 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
227 rc
= cifs_get_inode_info_unix(&newinode
, full_path
,
230 rc
= cifs_get_inode_info(&newinode
, full_path
,
231 buf
, inode
->i_sb
,xid
);
233 newinode
->i_mode
= mode
;
234 if((oplock
& CIFS_CREATE_ACTION
) &&
235 (cifs_sb
->mnt_cifs_flags
&
236 CIFS_MOUNT_SET_UID
)) {
237 newinode
->i_uid
= current
->fsuid
;
238 newinode
->i_gid
= current
->fsgid
;
245 ("Create worked but get_inode_info failed rc = %d",
249 direntry
->d_op
= &cifs_ci_dentry_ops
;
251 direntry
->d_op
= &cifs_dentry_ops
;
252 d_instantiate(direntry
, newinode
);
254 if((nd
->flags
& LOOKUP_OPEN
) == FALSE
) {
255 /* mknod case - do not leave file open */
256 CIFSSMBClose(xid
, pTcon
, fileHandle
);
257 } else if(newinode
) {
259 kzalloc(sizeof (struct cifsFileInfo
), GFP_KERNEL
);
261 if(pCifsFile
== NULL
)
262 goto cifs_create_out
;
263 pCifsFile
->netfid
= fileHandle
;
264 pCifsFile
->pid
= current
->tgid
;
265 pCifsFile
->pInode
= newinode
;
266 pCifsFile
->invalidHandle
= FALSE
;
267 pCifsFile
->closePend
= FALSE
;
268 init_MUTEX(&pCifsFile
->fh_sem
);
269 /* set the following in open now
270 pCifsFile->pfile = file; */
271 write_lock(&GlobalSMBSeslock
);
272 list_add(&pCifsFile
->tlist
,&pTcon
->openFileList
);
273 pCifsInode
= CIFS_I(newinode
);
275 /* if readable file instance put first in list*/
276 if (write_only
== TRUE
) {
277 list_add_tail(&pCifsFile
->flist
,
278 &pCifsInode
->openFileList
);
280 list_add(&pCifsFile
->flist
,
281 &pCifsInode
->openFileList
);
283 if((oplock
& 0xF) == OPLOCK_EXCLUSIVE
) {
284 pCifsInode
->clientCanCacheAll
= TRUE
;
285 pCifsInode
->clientCanCacheRead
= TRUE
;
286 cFYI(1,("Exclusive Oplock for inode %p",
288 } else if((oplock
& 0xF) == OPLOCK_READ
)
289 pCifsInode
->clientCanCacheRead
= TRUE
;
291 write_unlock(&GlobalSMBSeslock
);
301 int cifs_mknod(struct inode
*inode
, struct dentry
*direntry
, int mode
,
306 struct cifs_sb_info
*cifs_sb
;
307 struct cifsTconInfo
*pTcon
;
308 char *full_path
= NULL
;
309 struct inode
* newinode
= NULL
;
311 if (!old_valid_dev(device_number
))
316 cifs_sb
= CIFS_SB(inode
->i_sb
);
317 pTcon
= cifs_sb
->tcon
;
319 mutex_lock(&direntry
->d_sb
->s_vfs_rename_mutex
);
320 full_path
= build_path_from_dentry(direntry
);
321 mutex_unlock(&direntry
->d_sb
->s_vfs_rename_mutex
);
322 if(full_path
== NULL
)
324 else if (pTcon
->ses
->capabilities
& CAP_UNIX
) {
325 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
) {
326 rc
= CIFSSMBUnixSetPerms(xid
, pTcon
, full_path
,
327 mode
,(__u64
)current
->fsuid
,(__u64
)current
->fsgid
,
328 device_number
, cifs_sb
->local_nls
,
329 cifs_sb
->mnt_cifs_flags
&
330 CIFS_MOUNT_MAP_SPECIAL_CHR
);
332 rc
= CIFSSMBUnixSetPerms(xid
, pTcon
,
333 full_path
, mode
, (__u64
)-1, (__u64
)-1,
334 device_number
, cifs_sb
->local_nls
,
335 cifs_sb
->mnt_cifs_flags
&
336 CIFS_MOUNT_MAP_SPECIAL_CHR
);
340 rc
= cifs_get_inode_info_unix(&newinode
, full_path
,
343 direntry
->d_op
= &cifs_ci_dentry_ops
;
345 direntry
->d_op
= &cifs_dentry_ops
;
347 d_instantiate(direntry
, newinode
);
350 if(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
) {
355 cFYI(1,("sfu compat create special file"));
357 buf
= kmalloc(sizeof(FILE_ALL_INFO
),GFP_KERNEL
);
364 rc
= CIFSSMBOpen(xid
, pTcon
, full_path
,
365 FILE_CREATE
, /* fail if exists */
366 GENERIC_WRITE
/* BB would
367 WRITE_OWNER | WRITE_DAC be better? */,
368 /* Create a file and set the
369 file attribute to SYSTEM */
370 CREATE_NOT_DIR
| CREATE_OPTION_SPECIAL
,
371 &fileHandle
, &oplock
, buf
,
373 cifs_sb
->mnt_cifs_flags
&
374 CIFS_MOUNT_MAP_SPECIAL_CHR
);
377 /* BB Do not bother to decode buf since no
378 local inode yet to put timestamps in,
379 but we can reuse it safely */
381 struct win_dev
*pdev
;
382 pdev
= (struct win_dev
*)buf
;
384 memcpy(pdev
->type
, "IntxCHR", 8);
386 cpu_to_le64(MAJOR(device_number
));
388 cpu_to_le64(MINOR(device_number
));
389 rc
= CIFSSMBWrite(xid
, pTcon
,
391 sizeof(struct win_dev
),
392 0, &bytes_written
, (char *)pdev
,
394 } else if(S_ISBLK(mode
)) {
395 memcpy(pdev
->type
, "IntxBLK", 8);
397 cpu_to_le64(MAJOR(device_number
));
399 cpu_to_le64(MINOR(device_number
));
400 rc
= CIFSSMBWrite(xid
, pTcon
,
402 sizeof(struct win_dev
),
403 0, &bytes_written
, (char *)pdev
,
405 } /* else if(S_ISFIFO */
406 CIFSSMBClose(xid
, pTcon
, fileHandle
);
410 /* add code here to set EAs */
421 cifs_lookup(struct inode
*parent_dir_inode
, struct dentry
*direntry
, struct nameidata
*nd
)
424 int rc
= 0; /* to get around spurious gcc warning, set to zero here */
425 struct cifs_sb_info
*cifs_sb
;
426 struct cifsTconInfo
*pTcon
;
427 struct inode
*newInode
= NULL
;
428 char *full_path
= NULL
;
433 (" parent inode = 0x%p name is: %s and dentry = 0x%p",
434 parent_dir_inode
, direntry
->d_name
.name
, direntry
));
436 /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
438 /* check whether path exists */
440 cifs_sb
= CIFS_SB(parent_dir_inode
->i_sb
);
441 pTcon
= cifs_sb
->tcon
;
443 /* can not grab the rename sem here since it would
444 deadlock in the cases (beginning of sys_rename itself)
445 in which we already have the sb rename sem */
446 full_path
= build_path_from_dentry(direntry
);
447 if(full_path
== NULL
) {
449 return ERR_PTR(-ENOMEM
);
452 if (direntry
->d_inode
!= NULL
) {
453 cFYI(1, (" non-NULL inode in lookup"));
455 cFYI(1, (" NULL inode in lookup"));
458 (" Full path: %s inode = 0x%p", full_path
, direntry
->d_inode
));
460 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
461 rc
= cifs_get_inode_info_unix(&newInode
, full_path
,
462 parent_dir_inode
->i_sb
,xid
);
464 rc
= cifs_get_inode_info(&newInode
, full_path
, NULL
,
465 parent_dir_inode
->i_sb
,xid
);
467 if ((rc
== 0) && (newInode
!= NULL
)) {
469 direntry
->d_op
= &cifs_ci_dentry_ops
;
471 direntry
->d_op
= &cifs_dentry_ops
;
472 d_add(direntry
, newInode
);
474 /* since paths are not looked up by component - the parent
475 directories are presumed to be good here */
476 renew_parental_timestamps(direntry
);
478 } else if (rc
== -ENOENT
) {
480 direntry
->d_time
= jiffies
;
482 direntry
->d_op
= &cifs_ci_dentry_ops
;
484 direntry
->d_op
= &cifs_dentry_ops
;
485 d_add(direntry
, NULL
);
486 /* if it was once a directory (but how can we tell?) we could do
487 shrink_dcache_parent(direntry); */
489 cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
491 /* BB special case check for Access Denied - watch security
492 exposure of returning dir info implicitly via different rc
493 if file exists or not but no access BB */
502 cifs_d_revalidate(struct dentry
*direntry
, struct nameidata
*nd
)
506 if (direntry
->d_inode
) {
507 if (cifs_revalidate(direntry
)) {
511 cFYI(1, ("neg dentry 0x%p name = %s",
512 direntry
, direntry
->d_name
.name
));
513 if(time_after(jiffies
, direntry
->d_time
+ HZ
) ||
514 !lookupCacheEnabled
) {
523 /* static int cifs_d_delete(struct dentry *direntry)
527 cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
532 struct dentry_operations cifs_dentry_ops
= {
533 .d_revalidate
= cifs_d_revalidate
,
534 /* d_delete: cifs_d_delete, *//* not needed except for debugging */
535 /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
538 static int cifs_ci_hash(struct dentry
*dentry
, struct qstr
*q
)
540 struct nls_table
*codepage
= CIFS_SB(dentry
->d_inode
->i_sb
)->local_nls
;
544 hash
= init_name_hash();
545 for (i
= 0; i
< q
->len
; i
++)
546 hash
= partial_name_hash(nls_tolower(codepage
, q
->name
[i
]),
548 q
->hash
= end_name_hash(hash
);
553 static int cifs_ci_compare(struct dentry
*dentry
, struct qstr
*a
,
556 struct nls_table
*codepage
= CIFS_SB(dentry
->d_inode
->i_sb
)->local_nls
;
558 if ((a
->len
== b
->len
) &&
559 (nls_strnicmp(codepage
, a
->name
, b
->name
, a
->len
) == 0)) {
561 * To preserve case, don't let an existing negative dentry's
562 * case take precedence. If a is not a negative dentry, this
563 * should have no side effects
565 memcpy((unsigned char *)a
->name
, b
->name
, a
->len
);
571 struct dentry_operations cifs_ci_dentry_ops
= {
572 .d_revalidate
= cifs_d_revalidate
,
573 .d_hash
= cifs_ci_hash
,
574 .d_compare
= cifs_ci_compare
,