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,