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)
56 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
57 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
60 dirsep = CIFS_DIR_SEP(cifs_sb);
61 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
62 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
67 seq = read_seqbegin(&rename_lock);
69 for (temp = direntry; !IS_ROOT(temp);) {
70 namelen += (1 + temp->d_name.len);
71 temp = temp->d_parent;
73 cERROR(1, "corrupt dentry");
80 full_path = kmalloc(namelen+1, GFP_KERNEL);
81 if (full_path == NULL)
83 full_path[namelen] = 0; /* trailing null */
85 for (temp = direntry; !IS_ROOT(temp);) {
86 spin_lock(&temp->d_lock);
87 namelen -= 1 + temp->d_name.len;
89 spin_unlock(&temp->d_lock);
92 full_path[namelen] = dirsep;
93 strncpy(full_path + namelen + 1, temp->d_name.name,
95 cFYI(0, "name: %s", full_path + namelen);
97 spin_unlock(&temp->d_lock);
98 temp = temp->d_parent;
100 cERROR(1, "corrupt dentry");
107 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
108 cFYI(1, "did not end path lookup where expected. namelen=%d "
109 "dfsplen=%d", namelen, dfsplen);
110 /* presumably this is only possible if racing with a rename
111 of one of the parent directories (we can not lock the dentries
112 above us to prevent this, but retrying should be harmless) */
114 goto cifs_bp_rename_retry;
116 /* DIR_SEP already set for byte 0 / vs \ but not for
117 subsequent slashes in prepath which currently must
118 be entered the right way - not sure if there is an alternative
119 since the '\' is a valid posix character so we can not switch
120 those safely to '/' if any are found in the middle of the prepath */
121 /* BB test paths to Windows with '/' in the midst of prepath */
124 strncpy(full_path, tcon->treeName, dfsplen);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
127 for (i = 0; i < dfsplen; i++) {
128 if (full_path[i] == '\\')
137 * Don't allow the separator character in a path component.
138 * The VFS will not allow "/", but "\" is allowed by posix.
141 check_name(struct dentry *direntry)
143 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
146 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
147 for (i = 0; i < direntry->d_name.len; i++) {
148 if (direntry->d_name.name[i] == '\\') {
149 cFYI(1, "Invalid file name");
158 /* Inode operations in similar order to how they appear in Linux file fs.h */
160 static int cifs_do_create(struct inode *inode, struct dentry *direntry,
161 int xid, struct tcon_link *tlink, unsigned oflags,
162 umode_t mode, __u32 *oplock, __u16 *fileHandle,
166 int create_options = CREATE_NOT_DIR;
168 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
169 struct cifs_tcon *tcon = tlink_tcon(tlink);
170 char *full_path = NULL;
171 FILE_ALL_INFO *buf = NULL;
172 struct inode *newinode = NULL;
176 if (tcon->ses->server->oplocks)
177 *oplock = REQ_OPLOCK;
179 full_path = build_path_from_dentry(direntry);
180 if (full_path == NULL) {
185 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
186 !tcon->broken_posix_open &&
187 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
188 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
189 rc = cifs_posix_open(full_path, &newinode,
190 inode->i_sb, mode, oflags, oplock, fileHandle, xid);
193 if (newinode == NULL) {
194 /* query inode info */
195 goto cifs_create_get_file_info;
198 if (!S_ISREG(newinode->i_mode)) {
200 * The server may allow us to open things like
201 * FIFOs, but the client isn't set up to deal
202 * with that. If it's not a regular file, just
203 * close it and proceed as if it were a normal
206 CIFSSMBClose(xid, tcon, *fileHandle);
207 goto cifs_create_get_file_info;
209 /* success, no need to query */
210 goto cifs_create_set_dentry;
213 goto cifs_create_get_file_info;
218 * EIO could indicate that (posix open) operation is not
219 * supported, despite what server claimed in capability
222 * POSIX open in samba versions 3.3.1 and earlier could
223 * incorrectly fail with invalid parameter.
225 tcon->broken_posix_open = true;
231 * EREMOTE indicates DFS junction, which is not handled
232 * in posix open. If either that or op not supported
233 * returned, follow the normal lookup.
241 * fallthrough to retry, using older open call, this is case
242 * where server does not support this SMB level, and falsely
243 * claims capability (also get here for DFS case which should be
244 * rare for path not covered on files)
249 if (OPEN_FMODE(oflags) & FMODE_READ)
250 desiredAccess |= GENERIC_READ; /* is this too little? */
251 if (OPEN_FMODE(oflags) & FMODE_WRITE)
252 desiredAccess |= GENERIC_WRITE;
254 disposition = FILE_OVERWRITE_IF;
255 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
256 disposition = FILE_CREATE;
257 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
258 disposition = FILE_OVERWRITE_IF;
259 else if ((oflags & O_CREAT) == O_CREAT)
260 disposition = FILE_OPEN_IF;
262 cFYI(1, "Create flag not set in create function");
264 /* BB add processing to set equivalent of mode - e.g. via CreateX with
267 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
274 * if we're not using unix extensions, see if we need to set
275 * ATTR_READONLY on the create call
277 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
278 create_options |= CREATE_OPTION_READONLY;
280 if (backup_cred(cifs_sb))
281 create_options |= CREATE_OPEN_BACKUP_INTENT;
283 if (tcon->ses->capabilities & CAP_NT_SMBS)
284 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
285 desiredAccess, create_options,
286 fileHandle, oplock, buf, cifs_sb->local_nls,
287 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
289 rc = -EIO; /* no NT SMB support fall into legacy open below */
292 /* old server, retry the open legacy style */
293 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
294 desiredAccess, create_options,
295 fileHandle, oplock, buf, cifs_sb->local_nls,
296 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
299 cFYI(1, "cifs_create returned 0x%x", rc);
303 /* If Open reported that we actually created a file
304 then we now have to set the mode if possible */
305 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
306 struct cifs_unix_set_info_args args = {
308 .ctime = NO_CHANGE_64,
309 .atime = NO_CHANGE_64,
310 .mtime = NO_CHANGE_64,
314 *created |= FILE_CREATED;
315 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
316 args.uid = (__u64) current_fsuid();
317 if (inode->i_mode & S_ISGID)
318 args.gid = (__u64) inode->i_gid;
320 args.gid = (__u64) current_fsgid();
322 args.uid = NO_CHANGE_64;
323 args.gid = NO_CHANGE_64;
325 CIFSSMBUnixSetFileInfo(xid, tcon, &args, *fileHandle,
328 /* BB implement mode setting via Windows security
330 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
332 /* Could set r/o dos attribute if mode & 0222 == 0 */
335 cifs_create_get_file_info:
336 /* server might mask mode so we have to query for it */
338 rc = cifs_get_inode_info_unix(&newinode, full_path,
341 rc = cifs_get_inode_info(&newinode, full_path, buf,
342 inode->i_sb, xid, fileHandle);
344 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
345 newinode->i_mode = mode;
346 if ((*oplock & CIFS_CREATE_ACTION) &&
347 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
348 newinode->i_uid = current_fsuid();
349 if (inode->i_mode & S_ISGID)
350 newinode->i_gid = inode->i_gid;
352 newinode->i_gid = current_fsgid();
357 cifs_create_set_dentry:
359 cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
363 d_add(direntry, newinode);
365 /* ENOENT for create? How weird... */
368 CIFSSMBClose(xid, tcon, *fileHandle);
380 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
381 struct file *file, unsigned oflags, umode_t mode,
386 struct tcon_link *tlink;
387 struct cifs_tcon *tcon;
391 struct cifsFileInfo *pfile_info;
393 /* Posix open is only called (at lookup time) for file create now. For
394 * opens (rather than creates), because we do not know if it is a file
395 * or directory yet, and current Samba no longer allows us to do posix
396 * open on dirs, we could end up wasting an open call on what turns out
397 * to be a dir. For file opens, we wait to call posix open till
398 * cifs_open. It could be added to atomic_open in the future but the
399 * performance tradeoff of the extra network request when EISDIR or
400 * EACCES is returned would have to be weighed against the 50% reduction
401 * in network traffic in the other paths.
403 if (!(oflags & O_CREAT)) {
404 struct dentry *res = cifs_lookup(inode, direntry, NULL);
408 finish_no_open(file, res);
412 rc = check_name(direntry);
418 cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
419 inode, direntry->d_name.name, direntry);
421 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
422 filp = ERR_CAST(tlink);
426 tcon = tlink_tcon(tlink);
428 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
429 &oplock, &fileHandle, opened);
434 rc = finish_open(file, direntry, generic_file_open, opened);
436 CIFSSMBClose(xid, tcon, fileHandle);
440 pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
441 if (pfile_info == NULL) {
442 CIFSSMBClose(xid, tcon, fileHandle);
448 cifs_put_tlink(tlink);
454 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
455 struct nameidata *nd)
460 * BB below access is probably too much for mknod to request
461 * but we have to do query and setpathinfo so requesting
462 * less could fail (unless we want to request getatr and setatr
463 * permissions (only). At least for POSIX we do not have to
466 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
467 struct tcon_link *tlink;
470 int created = FILE_CREATED;
472 cFYI(1, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p",
473 inode, direntry->d_name.name, direntry);
475 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
480 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
481 &oplock, &fileHandle, &created);
483 CIFSSMBClose(xid, tlink_tcon(tlink), fileHandle);
485 cifs_put_tlink(tlink);
492 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
497 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
498 struct cifs_sb_info *cifs_sb;
499 struct tcon_link *tlink;
500 struct cifs_tcon *pTcon;
501 struct cifs_io_parms io_parms;
502 char *full_path = NULL;
503 struct inode *newinode = NULL;
506 FILE_ALL_INFO *buf = NULL;
507 unsigned int bytes_written;
508 struct win_dev *pdev;
510 if (!old_valid_dev(device_number))
513 cifs_sb = CIFS_SB(inode->i_sb);
514 tlink = cifs_sb_tlink(cifs_sb);
516 return PTR_ERR(tlink);
518 pTcon = tlink_tcon(tlink);
522 full_path = build_path_from_dentry(direntry);
523 if (full_path == NULL) {
528 if (pTcon->unix_ext) {
529 struct cifs_unix_set_info_args args = {
530 .mode = mode & ~current_umask(),
531 .ctime = NO_CHANGE_64,
532 .atime = NO_CHANGE_64,
533 .mtime = NO_CHANGE_64,
534 .device = device_number,
536 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
537 args.uid = (__u64) current_fsuid();
538 args.gid = (__u64) current_fsgid();
540 args.uid = NO_CHANGE_64;
541 args.gid = NO_CHANGE_64;
543 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
545 cifs_sb->mnt_cifs_flags &
546 CIFS_MOUNT_MAP_SPECIAL_CHR);
550 rc = cifs_get_inode_info_unix(&newinode, full_path,
554 d_instantiate(direntry, newinode);
558 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
562 cFYI(1, "sfu compat create special file");
564 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
572 if (backup_cred(cifs_sb))
573 create_options |= CREATE_OPEN_BACKUP_INTENT;
575 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
576 GENERIC_WRITE, create_options,
577 &fileHandle, &oplock, buf, cifs_sb->local_nls,
578 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
582 /* BB Do not bother to decode buf since no local inode yet to put
583 * timestamps in, but we can reuse it safely */
585 pdev = (struct win_dev *)buf;
586 io_parms.netfid = fileHandle;
587 io_parms.pid = current->tgid;
588 io_parms.tcon = pTcon;
590 io_parms.length = sizeof(struct win_dev);
592 memcpy(pdev->type, "IntxCHR", 8);
594 cpu_to_le64(MAJOR(device_number));
596 cpu_to_le64(MINOR(device_number));
597 rc = CIFSSMBWrite(xid, &io_parms,
598 &bytes_written, (char *)pdev,
600 } else if (S_ISBLK(mode)) {
601 memcpy(pdev->type, "IntxBLK", 8);
603 cpu_to_le64(MAJOR(device_number));
605 cpu_to_le64(MINOR(device_number));
606 rc = CIFSSMBWrite(xid, &io_parms,
607 &bytes_written, (char *)pdev,
609 } /* else if (S_ISFIFO) */
610 CIFSSMBClose(xid, pTcon, fileHandle);
613 /* FIXME: add code here to set EAs */
619 cifs_put_tlink(tlink);
624 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
625 struct nameidata *nd)
628 int rc = 0; /* to get around spurious gcc warning, set to zero here */
629 struct cifs_sb_info *cifs_sb;
630 struct tcon_link *tlink;
631 struct cifs_tcon *pTcon;
632 struct inode *newInode = NULL;
633 char *full_path = NULL;
637 cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
638 parent_dir_inode, direntry->d_name.name, direntry);
640 /* check whether path exists */
642 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
643 tlink = cifs_sb_tlink(cifs_sb);
646 return (struct dentry *)tlink;
648 pTcon = tlink_tcon(tlink);
650 rc = check_name(direntry);
654 /* can not grab the rename sem here since it would
655 deadlock in the cases (beginning of sys_rename itself)
656 in which we already have the sb rename sem */
657 full_path = build_path_from_dentry(direntry);
658 if (full_path == NULL) {
663 if (direntry->d_inode != NULL) {
664 cFYI(1, "non-NULL inode in lookup");
666 cFYI(1, "NULL inode in lookup");
668 cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
670 if (pTcon->unix_ext) {
671 rc = cifs_get_inode_info_unix(&newInode, full_path,
672 parent_dir_inode->i_sb, xid);
674 rc = cifs_get_inode_info(&newInode, full_path, NULL,
675 parent_dir_inode->i_sb, xid, NULL);
678 if ((rc == 0) && (newInode != NULL)) {
679 d_add(direntry, newInode);
680 /* since paths are not looked up by component - the parent
681 directories are presumed to be good here */
682 renew_parental_timestamps(direntry);
684 } else if (rc == -ENOENT) {
686 direntry->d_time = jiffies;
687 d_add(direntry, NULL);
688 /* if it was once a directory (but how can we tell?) we could do
689 shrink_dcache_parent(direntry); */
690 } else if (rc != -EACCES) {
691 cERROR(1, "Unexpected lookup error %d", rc);
692 /* We special case check for Access Denied - since that
693 is a common return code */
698 cifs_put_tlink(tlink);
704 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
706 if (nd && (nd->flags & LOOKUP_RCU))
709 if (direntry->d_inode) {
710 if (cifs_revalidate_dentry(direntry))
714 * If the inode wasn't known to be a dfs entry when
715 * the dentry was instantiated, such as when created
716 * via ->readdir(), it needs to be set now since the
717 * attributes will have been updated by
718 * cifs_revalidate_dentry().
720 if (IS_AUTOMOUNT(direntry->d_inode) &&
721 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
722 spin_lock(&direntry->d_lock);
723 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
724 spin_unlock(&direntry->d_lock);
732 * This may be nfsd (or something), anyway, we can't see the
733 * intent of this. So, since this can be for creation, drop it.
739 * Drop the negative dentry, in order to make sure to use the
740 * case sensitive name which is specified by user if this is
743 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
746 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
752 /* static int cifs_d_delete(struct dentry *direntry)
756 cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
761 const struct dentry_operations cifs_dentry_ops = {
762 .d_revalidate = cifs_d_revalidate,
763 .d_automount = cifs_dfs_d_automount,
764 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
767 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
770 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
774 hash = init_name_hash();
775 for (i = 0; i < q->len; i++)
776 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
778 q->hash = end_name_hash(hash);
783 static int cifs_ci_compare(const struct dentry *parent,
784 const struct inode *pinode,
785 const struct dentry *dentry, const struct inode *inode,
786 unsigned int len, const char *str, const struct qstr *name)
788 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
790 if ((name->len == len) &&
791 (nls_strnicmp(codepage, name->name, str, len) == 0))
796 const struct dentry_operations cifs_ci_dentry_ops = {
797 .d_revalidate = cifs_d_revalidate,
798 .d_hash = cifs_ci_hash,
799 .d_compare = cifs_ci_compare,
800 .d_automount = cifs_dfs_d_automount,