4 * vfs operations that deal with dentries
6 * Copyright (C) International Business Machines Corp., 2002,2009
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>
27 #include <linux/mount.h>
28 #include <linux/file.h>
32 #include "cifsproto.h"
33 #include "cifs_debug.h"
34 #include "cifs_fs_sb.h"
37 renew_parental_timestamps(struct dentry *direntry)
39 /* BB check if there is a way to get the kernel to do this or if we
42 direntry->d_time = jiffies;
43 direntry = direntry->d_parent;
44 } while (!IS_ROOT(direntry));
47 /* Note: caller must free return buffer */
49 build_path_from_dentry(struct dentry *direntry)
57 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
58 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
61 return NULL; /* not much we can do if dentry is freed and
62 we need to reopen the file after it was closed implicitly
63 when the server crashed */
65 dirsep = CIFS_DIR_SEP(cifs_sb);
66 pplen = cifs_sb->prepathlen;
67 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
68 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
72 namelen = pplen + dfsplen;
73 for (temp = direntry; !IS_ROOT(temp);) {
74 namelen += (1 + temp->d_name.len);
75 temp = temp->d_parent;
77 cERROR(1, "corrupt dentry");
82 full_path = kmalloc(namelen+1, GFP_KERNEL);
83 if (full_path == NULL)
85 full_path[namelen] = 0; /* trailing null */
86 for (temp = direntry; !IS_ROOT(temp);) {
87 namelen -= 1 + temp->d_name.len;
91 full_path[namelen] = dirsep;
92 strncpy(full_path + namelen + 1, temp->d_name.name,
94 cFYI(0, "name: %s", full_path + namelen);
96 temp = temp->d_parent;
98 cERROR(1, "corrupt dentry");
103 if (namelen != pplen + dfsplen) {
104 cERROR(1, "did not end path lookup where expected namelen is %d",
106 /* presumably this is only possible if racing with a rename
107 of one of the parent directories (we can not lock the dentries
108 above us to prevent this, but retrying should be harmless) */
110 goto cifs_bp_rename_retry;
112 /* DIR_SEP already set for byte 0 / vs \ but not for
113 subsequent slashes in prepath which currently must
114 be entered the right way - not sure if there is an alternative
115 since the '\' is a valid posix character so we can not switch
116 those safely to '/' if any are found in the middle of the prepath */
117 /* BB test paths to Windows with '/' in the midst of prepath */
120 strncpy(full_path, tcon->treeName, dfsplen);
121 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
123 for (i = 0; i < dfsplen; i++) {
124 if (full_path[i] == '\\')
129 strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
133 /* Inode operations in similar order to how they appear in Linux file fs.h */
136 cifs_create(struct inode *inode, struct dentry *direntry, int mode,
137 struct nameidata *nd)
141 int create_options = CREATE_NOT_DIR;
145 * BB below access is probably too much for mknod to request
146 * but we have to do query and setpathinfo so requesting
147 * less could fail (unless we want to request getatr and setatr
148 * permissions (only). At least for POSIX we do not have to
151 int desiredAccess = GENERIC_READ | GENERIC_WRITE;
153 struct cifs_sb_info *cifs_sb;
154 struct tcon_link *tlink;
155 struct cifsTconInfo *tcon;
156 char *full_path = NULL;
157 FILE_ALL_INFO *buf = NULL;
158 struct inode *newinode = NULL;
159 int disposition = FILE_OVERWRITE_IF;
163 cifs_sb = CIFS_SB(inode->i_sb);
164 tlink = cifs_sb_tlink(cifs_sb);
167 return PTR_ERR(tlink);
169 tcon = tlink_tcon(tlink);
174 if (nd && (nd->flags & LOOKUP_OPEN))
175 oflags = nd->intent.open.file->f_flags;
177 oflags = O_RDONLY | O_CREAT;
179 full_path = build_path_from_dentry(direntry);
180 if (full_path == NULL) {
182 goto cifs_create_out;
185 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
186 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
187 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
188 rc = cifs_posix_open(full_path, &newinode,
189 inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
190 /* EIO could indicate that (posix open) operation is not
191 supported, despite what server claimed in capability
192 negotiation. EREMOTE indicates DFS junction, which is not
193 handled in posix open */
196 if (newinode == NULL) /* query inode info */
197 goto cifs_create_get_file_info;
198 else /* success, no need to query */
199 goto cifs_create_set_dentry;
200 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
201 (rc != -EOPNOTSUPP) && (rc != -EINVAL))
202 goto cifs_create_out;
203 /* else fallthrough to retry, using older open call, this is
204 case where server does not support this SMB level, and
205 falsely claims capability (also get here for DFS case
206 which should be rare for path not covered on files) */
209 if (nd && (nd->flags & LOOKUP_OPEN)) {
210 /* if the file is going to stay open, then we
211 need to set the desired access properly */
213 if (OPEN_FMODE(oflags) & FMODE_READ)
214 desiredAccess |= GENERIC_READ; /* is this too little? */
215 if (OPEN_FMODE(oflags) & FMODE_WRITE)
216 desiredAccess |= GENERIC_WRITE;
218 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
219 disposition = FILE_CREATE;
220 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
221 disposition = FILE_OVERWRITE_IF;
222 else if ((oflags & O_CREAT) == O_CREAT)
223 disposition = FILE_OPEN_IF;
225 cFYI(1, "Create flag not set in create function");
228 /* BB add processing to set equivalent of mode - e.g. via CreateX with
231 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
234 goto cifs_create_out;
238 * if we're not using unix extensions, see if we need to set
239 * ATTR_READONLY on the create call
241 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
242 create_options |= CREATE_OPTION_READONLY;
244 if (tcon->ses->capabilities & CAP_NT_SMBS)
245 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
246 desiredAccess, create_options,
247 &fileHandle, &oplock, buf, cifs_sb->local_nls,
248 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
250 rc = -EIO; /* no NT SMB support fall into legacy open below */
253 /* old server, retry the open legacy style */
254 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
255 desiredAccess, create_options,
256 &fileHandle, &oplock, buf, cifs_sb->local_nls,
257 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
260 cFYI(1, "cifs_create returned 0x%x", rc);
261 goto cifs_create_out;
264 /* If Open reported that we actually created a file
265 then we now have to set the mode if possible */
266 if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
267 struct cifs_unix_set_info_args args = {
269 .ctime = NO_CHANGE_64,
270 .atime = NO_CHANGE_64,
271 .mtime = NO_CHANGE_64,
275 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
276 args.uid = (__u64) current_fsuid();
277 if (inode->i_mode & S_ISGID)
278 args.gid = (__u64) inode->i_gid;
280 args.gid = (__u64) current_fsgid();
282 args.uid = NO_CHANGE_64;
283 args.gid = NO_CHANGE_64;
285 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fileHandle,
288 /* BB implement mode setting via Windows security
290 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
292 /* Could set r/o dos attribute if mode & 0222 == 0 */
295 cifs_create_get_file_info:
296 /* server might mask mode so we have to query for it */
298 rc = cifs_get_inode_info_unix(&newinode, full_path,
301 rc = cifs_get_inode_info(&newinode, full_path, buf,
302 inode->i_sb, xid, &fileHandle);
304 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
305 newinode->i_mode = mode;
306 if ((oplock & CIFS_CREATE_ACTION) &&
307 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
308 newinode->i_uid = current_fsuid();
309 if (inode->i_mode & S_ISGID)
310 newinode->i_gid = inode->i_gid;
312 newinode->i_gid = current_fsgid();
317 cifs_create_set_dentry:
319 d_instantiate(direntry, newinode);
321 cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
323 if (newinode && nd && (nd->flags & LOOKUP_OPEN)) {
324 struct cifsFileInfo *pfile_info;
327 filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
330 CIFSSMBClose(xid, tcon, fileHandle);
331 goto cifs_create_out;
334 pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
335 if (pfile_info == NULL) {
337 CIFSSMBClose(xid, tcon, fileHandle);
341 CIFSSMBClose(xid, tcon, fileHandle);
347 cifs_put_tlink(tlink);
352 int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
357 struct cifs_sb_info *cifs_sb;
358 struct tcon_link *tlink;
359 struct cifsTconInfo *pTcon;
360 struct cifs_io_parms io_parms;
361 char *full_path = NULL;
362 struct inode *newinode = NULL;
365 FILE_ALL_INFO *buf = NULL;
366 unsigned int bytes_written;
367 struct win_dev *pdev;
369 if (!old_valid_dev(device_number))
372 cifs_sb = CIFS_SB(inode->i_sb);
373 tlink = cifs_sb_tlink(cifs_sb);
375 return PTR_ERR(tlink);
377 pTcon = tlink_tcon(tlink);
381 full_path = build_path_from_dentry(direntry);
382 if (full_path == NULL) {
387 if (pTcon->unix_ext) {
388 struct cifs_unix_set_info_args args = {
389 .mode = mode & ~current_umask(),
390 .ctime = NO_CHANGE_64,
391 .atime = NO_CHANGE_64,
392 .mtime = NO_CHANGE_64,
393 .device = device_number,
395 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
396 args.uid = (__u64) current_fsuid();
397 args.gid = (__u64) current_fsgid();
399 args.uid = NO_CHANGE_64;
400 args.gid = NO_CHANGE_64;
402 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
404 cifs_sb->mnt_cifs_flags &
405 CIFS_MOUNT_MAP_SPECIAL_CHR);
409 rc = cifs_get_inode_info_unix(&newinode, full_path,
413 d_instantiate(direntry, newinode);
417 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
421 cFYI(1, "sfu compat create special file");
423 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
431 /* FIXME: would WRITE_OWNER | WRITE_DAC be better? */
432 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
433 GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
434 &fileHandle, &oplock, buf, cifs_sb->local_nls,
435 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
439 /* BB Do not bother to decode buf since no local inode yet to put
440 * timestamps in, but we can reuse it safely */
442 pdev = (struct win_dev *)buf;
443 io_parms.netfid = fileHandle;
444 io_parms.pid = current->tgid;
445 io_parms.tcon = pTcon;
447 io_parms.length = sizeof(struct win_dev);
449 memcpy(pdev->type, "IntxCHR", 8);
451 cpu_to_le64(MAJOR(device_number));
453 cpu_to_le64(MINOR(device_number));
454 rc = CIFSSMBWrite(xid, &io_parms,
455 &bytes_written, (char *)pdev,
457 } else if (S_ISBLK(mode)) {
458 memcpy(pdev->type, "IntxBLK", 8);
460 cpu_to_le64(MAJOR(device_number));
462 cpu_to_le64(MINOR(device_number));
463 rc = CIFSSMBWrite(xid, &io_parms,
464 &bytes_written, (char *)pdev,
466 } /* else if (S_ISFIFO) */
467 CIFSSMBClose(xid, pTcon, fileHandle);
470 /* FIXME: add code here to set EAs */
476 cifs_put_tlink(tlink);
481 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
482 struct nameidata *nd)
485 int rc = 0; /* to get around spurious gcc warning, set to zero here */
487 __u16 fileHandle = 0;
488 bool posix_open = false;
489 struct cifs_sb_info *cifs_sb;
490 struct tcon_link *tlink;
491 struct cifsTconInfo *pTcon;
492 struct cifsFileInfo *cfile;
493 struct inode *newInode = NULL;
494 char *full_path = NULL;
499 cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
500 parent_dir_inode, direntry->d_name.name, direntry);
502 /* check whether path exists */
504 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
505 tlink = cifs_sb_tlink(cifs_sb);
508 return (struct dentry *)tlink;
510 pTcon = tlink_tcon(tlink);
513 * Don't allow the separator character in a path component.
514 * The VFS will not allow "/", but "\" is allowed by posix.
516 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
518 for (i = 0; i < direntry->d_name.len; i++)
519 if (direntry->d_name.name[i] == '\\') {
520 cFYI(1, "Invalid file name");
527 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
528 * the VFS handle the create.
530 if (nd && (nd->flags & LOOKUP_EXCL)) {
531 d_instantiate(direntry, NULL);
536 /* can not grab the rename sem here since it would
537 deadlock in the cases (beginning of sys_rename itself)
538 in which we already have the sb rename sem */
539 full_path = build_path_from_dentry(direntry);
540 if (full_path == NULL) {
545 if (direntry->d_inode != NULL) {
546 cFYI(1, "non-NULL inode in lookup");
548 cFYI(1, "NULL inode in lookup");
550 cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
552 /* Posix open is only called (at lookup time) for file create now.
553 * For opens (rather than creates), because we do not know if it
554 * is a file or directory yet, and current Samba no longer allows
555 * us to do posix open on dirs, we could end up wasting an open call
556 * on what turns out to be a dir. For file opens, we wait to call posix
557 * open till cifs_open. It could be added here (lookup) in the future
558 * but the performance tradeoff of the extra network request when EISDIR
559 * or EACCES is returned would have to be weighed against the 50%
560 * reduction in network traffic in the other paths.
562 if (pTcon->unix_ext) {
563 if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
564 (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
565 (nd->intent.open.file->f_flags & O_CREAT)) {
566 rc = cifs_posix_open(full_path, &newInode,
567 parent_dir_inode->i_sb,
568 nd->intent.open.create_mode,
569 nd->intent.open.file->f_flags, &oplock,
572 * The check below works around a bug in POSIX
573 * open in samba versions 3.3.1 and earlier where
574 * open could incorrectly fail with invalid parameter.
575 * If either that or op not supported returned, follow
578 if ((rc == 0) || (rc == -ENOENT))
580 else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
581 pTcon->broken_posix_open = true;
584 rc = cifs_get_inode_info_unix(&newInode, full_path,
585 parent_dir_inode->i_sb, xid);
587 rc = cifs_get_inode_info(&newInode, full_path, NULL,
588 parent_dir_inode->i_sb, xid, NULL);
590 if ((rc == 0) && (newInode != NULL)) {
591 d_add(direntry, newInode);
593 filp = lookup_instantiate_filp(nd, direntry,
597 CIFSSMBClose(xid, pTcon, fileHandle);
601 cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
605 CIFSSMBClose(xid, pTcon, fileHandle);
610 /* since paths are not looked up by component - the parent
611 directories are presumed to be good here */
612 renew_parental_timestamps(direntry);
614 } else if (rc == -ENOENT) {
616 direntry->d_time = jiffies;
617 d_add(direntry, NULL);
618 /* if it was once a directory (but how can we tell?) we could do
619 shrink_dcache_parent(direntry); */
620 } else if (rc != -EACCES) {
621 cERROR(1, "Unexpected lookup error %d", rc);
622 /* We special case check for Access Denied - since that
623 is a common return code */
628 cifs_put_tlink(tlink);
634 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
636 if (nd->flags & LOOKUP_RCU)
639 if (direntry->d_inode) {
640 if (cifs_revalidate_dentry(direntry))
647 * This may be nfsd (or something), anyway, we can't see the
648 * intent of this. So, since this can be for creation, drop it.
654 * Drop the negative dentry, in order to make sure to use the
655 * case sensitive name which is specified by user if this is
658 if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
659 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
663 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
669 /* static int cifs_d_delete(struct dentry *direntry)
673 cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
678 const struct dentry_operations cifs_dentry_ops = {
679 .d_revalidate = cifs_d_revalidate,
680 .d_automount = cifs_dfs_d_automount,
681 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
684 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
687 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
691 hash = init_name_hash();
692 for (i = 0; i < q->len; i++)
693 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
695 q->hash = end_name_hash(hash);
700 static int cifs_ci_compare(const struct dentry *parent,
701 const struct inode *pinode,
702 const struct dentry *dentry, const struct inode *inode,
703 unsigned int len, const char *str, const struct qstr *name)
705 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
707 if ((name->len == len) &&
708 (nls_strnicmp(codepage, name->name, str, len) == 0))
713 const struct dentry_operations cifs_ci_dentry_ops = {
714 .d_revalidate = cifs_d_revalidate,
715 .d_hash = cifs_ci_hash,
716 .d_compare = cifs_ci_compare,
717 .d_automount = cifs_dfs_d_automount,