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)
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->fsuid,
204 (__u64)current->fsgid,
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;
233 if((oplock & CIFS_CREATE_ACTION) &&
234 (cifs_sb->mnt_cifs_flags &
235 CIFS_MOUNT_SET_UID)) {
236 newinode->i_uid = current->fsuid;
237 newinode->i_gid = current->fsgid;
244 ("Create worked but get_inode_info failed rc = %d",
248 direntry->d_op = &cifs_ci_dentry_ops;
250 direntry->d_op = &cifs_dentry_ops;
251 d_instantiate(direntry, newinode);
253 if((nd->flags & LOOKUP_OPEN) == FALSE) {
254 /* mknod case - do not leave file open */
255 CIFSSMBClose(xid, pTcon, fileHandle);
256 } else if(newinode) {
258 kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
260 if(pCifsFile == NULL)
261 goto cifs_create_out;
262 pCifsFile->netfid = fileHandle;
263 pCifsFile->pid = current->tgid;
264 pCifsFile->pInode = newinode;
265 pCifsFile->invalidHandle = FALSE;
266 pCifsFile->closePend = FALSE;
267 init_MUTEX(&pCifsFile->fh_sem);
268 /* set the following in open now
269 pCifsFile->pfile = file; */
270 write_lock(&GlobalSMBSeslock);
271 list_add(&pCifsFile->tlist,&pTcon->openFileList);
272 pCifsInode = CIFS_I(newinode);
274 /* if readable file instance put first in list*/
275 if (write_only == TRUE) {
276 list_add_tail(&pCifsFile->flist,
277 &pCifsInode->openFileList);
279 list_add(&pCifsFile->flist,
280 &pCifsInode->openFileList);
282 if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
283 pCifsInode->clientCanCacheAll = TRUE;
284 pCifsInode->clientCanCacheRead = TRUE;
285 cFYI(1,("Exclusive Oplock for inode %p",
287 } else if((oplock & 0xF) == OPLOCK_READ)
288 pCifsInode->clientCanCacheRead = TRUE;
290 write_unlock(&GlobalSMBSeslock);
300 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
305 struct cifs_sb_info *cifs_sb;
306 struct cifsTconInfo *pTcon;
307 char *full_path = NULL;
308 struct inode * newinode = NULL;
310 if (!old_valid_dev(device_number))
315 cifs_sb = CIFS_SB(inode->i_sb);
316 pTcon = cifs_sb->tcon;
318 down(&direntry->d_sb->s_vfs_rename_sem);
319 full_path = build_path_from_dentry(direntry);
320 up(&direntry->d_sb->s_vfs_rename_sem);
321 if(full_path == NULL)
323 else if (pTcon->ses->capabilities & CAP_UNIX) {
324 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
325 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
326 mode,(__u64)current->fsuid,(__u64)current->fsgid,
327 device_number, cifs_sb->local_nls,
328 cifs_sb->mnt_cifs_flags &
329 CIFS_MOUNT_MAP_SPECIAL_CHR);
331 rc = CIFSSMBUnixSetPerms(xid, pTcon,
332 full_path, mode, (__u64)-1, (__u64)-1,
333 device_number, cifs_sb->local_nls,
334 cifs_sb->mnt_cifs_flags &
335 CIFS_MOUNT_MAP_SPECIAL_CHR);
339 rc = cifs_get_inode_info_unix(&newinode, full_path,
342 direntry->d_op = &cifs_ci_dentry_ops;
344 direntry->d_op = &cifs_dentry_ops;
346 d_instantiate(direntry, newinode);
349 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
354 cFYI(1,("sfu compat create special file"));
356 buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
363 rc = CIFSSMBOpen(xid, pTcon, full_path,
364 FILE_CREATE, /* fail if exists */
365 GENERIC_WRITE /* BB would
366 WRITE_OWNER | WRITE_DAC be better? */,
367 /* Create a file and set the
368 file attribute to SYSTEM */
369 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
370 &fileHandle, &oplock, buf,
372 cifs_sb->mnt_cifs_flags &
373 CIFS_MOUNT_MAP_SPECIAL_CHR);
376 /* BB Do not bother to decode buf since no
377 local inode yet to put timestamps in,
378 but we can reuse it safely */
380 struct win_dev *pdev;
381 pdev = (struct win_dev *)buf;
383 memcpy(pdev->type, "IntxCHR", 8);
385 cpu_to_le64(MAJOR(device_number));
387 cpu_to_le64(MINOR(device_number));
388 rc = CIFSSMBWrite(xid, pTcon,
390 sizeof(struct win_dev),
391 0, &bytes_written, (char *)pdev,
393 } else if(S_ISBLK(mode)) {
394 memcpy(pdev->type, "IntxBLK", 8);
396 cpu_to_le64(MAJOR(device_number));
398 cpu_to_le64(MINOR(device_number));
399 rc = CIFSSMBWrite(xid, pTcon,
401 sizeof(struct win_dev),
402 0, &bytes_written, (char *)pdev,
404 } /* else if(S_ISFIFO */
405 CIFSSMBClose(xid, pTcon, fileHandle);
409 /* add code here to set EAs */
420 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
423 int rc = 0; /* to get around spurious gcc warning, set to zero here */
424 struct cifs_sb_info *cifs_sb;
425 struct cifsTconInfo *pTcon;
426 struct inode *newInode = NULL;
427 char *full_path = NULL;
432 (" parent inode = 0x%p name is: %s and dentry = 0x%p",
433 parent_dir_inode, direntry->d_name.name, direntry));
435 /* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
437 /* check whether path exists */
439 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
440 pTcon = cifs_sb->tcon;
442 /* can not grab the rename sem here since it would
443 deadlock in the cases (beginning of sys_rename itself)
444 in which we already have the sb rename sem */
445 full_path = build_path_from_dentry(direntry);
446 if(full_path == NULL) {
448 return ERR_PTR(-ENOMEM);
451 if (direntry->d_inode != NULL) {
452 cFYI(1, (" non-NULL inode in lookup"));
454 cFYI(1, (" NULL inode in lookup"));
457 (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
459 if (pTcon->ses->capabilities & CAP_UNIX)
460 rc = cifs_get_inode_info_unix(&newInode, full_path,
461 parent_dir_inode->i_sb,xid);
463 rc = cifs_get_inode_info(&newInode, full_path, NULL,
464 parent_dir_inode->i_sb,xid);
466 if ((rc == 0) && (newInode != NULL)) {
468 direntry->d_op = &cifs_ci_dentry_ops;
470 direntry->d_op = &cifs_dentry_ops;
471 d_add(direntry, newInode);
473 /* since paths are not looked up by component - the parent
474 directories are presumed to be good here */
475 renew_parental_timestamps(direntry);
477 } else if (rc == -ENOENT) {
479 direntry->d_time = jiffies;
481 direntry->d_op = &cifs_ci_dentry_ops;
483 direntry->d_op = &cifs_dentry_ops;
484 d_add(direntry, NULL);
485 /* if it was once a directory (but how can we tell?) we could do
486 shrink_dcache_parent(direntry); */
488 cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
490 /* BB special case check for Access Denied - watch security
491 exposure of returning dir info implicitly via different rc
492 if file exists or not but no access BB */
501 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
505 if (direntry->d_inode) {
506 if (cifs_revalidate(direntry)) {
510 cFYI(1, ("neg dentry 0x%p name = %s",
511 direntry, direntry->d_name.name));
512 if(time_after(jiffies, direntry->d_time + HZ) ||
513 !lookupCacheEnabled) {
522 /* static int cifs_d_delete(struct dentry *direntry)
526 cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
531 struct dentry_operations cifs_dentry_ops = {
532 .d_revalidate = cifs_d_revalidate,
533 /* d_delete: cifs_d_delete, *//* not needed except for debugging */
534 /* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
537 static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
539 struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
543 hash = init_name_hash();
544 for (i = 0; i < q->len; i++)
545 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
547 q->hash = end_name_hash(hash);
552 static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
555 struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
557 if ((a->len == b->len) &&
558 (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
560 * To preserve case, don't let an existing negative dentry's
561 * case take precedence. If a is not a negative dentry, this
562 * should have no side effects
564 memcpy((unsigned char *)a->name, b->name, a->len);
570 struct dentry_operations cifs_ci_dentry_ops = {
571 .d_revalidate = cifs_d_revalidate,
572 .d_hash = cifs_ci_hash,
573 .d_compare = cifs_ci_compare,