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"
35 #include "cifs_unicode.h"
38 renew_parental_timestamps(struct dentry *direntry)
40 /* BB check if there is a way to get the kernel to do this or if we
43 direntry->d_time = jiffies;
44 direntry = direntry->d_parent;
45 } while (!IS_ROOT(direntry));
49 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
50 struct cifs_tcon *tcon)
52 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
54 char *full_path = NULL;
56 /* if no prefix path, simply set path to the root of share to "" */
58 full_path = kzalloc(1, GFP_KERNEL);
62 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
63 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
67 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
68 if (full_path == NULL)
72 strncpy(full_path, tcon->treeName, dfsplen);
73 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
74 strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
75 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
76 full_path[dfsplen + pplen] = 0; /* add trailing null */
80 /* Note: caller must free return buffer */
82 build_path_from_dentry(struct dentry *direntry)
89 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
90 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
93 dirsep = CIFS_DIR_SEP(cifs_sb);
94 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
95 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
100 seq = read_seqbegin(&rename_lock);
102 for (temp = direntry; !IS_ROOT(temp);) {
103 namelen += (1 + temp->d_name.len);
104 temp = temp->d_parent;
106 cifs_dbg(VFS, "corrupt dentry\n");
113 full_path = kmalloc(namelen+1, GFP_KERNEL);
114 if (full_path == NULL)
116 full_path[namelen] = 0; /* trailing null */
118 for (temp = direntry; !IS_ROOT(temp);) {
119 spin_lock(&temp->d_lock);
120 namelen -= 1 + temp->d_name.len;
122 spin_unlock(&temp->d_lock);
125 full_path[namelen] = dirsep;
126 strncpy(full_path + namelen + 1, temp->d_name.name,
128 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
130 spin_unlock(&temp->d_lock);
131 temp = temp->d_parent;
133 cifs_dbg(VFS, "corrupt dentry\n");
140 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
141 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
143 /* presumably this is only possible if racing with a rename
144 of one of the parent directories (we can not lock the dentries
145 above us to prevent this, but retrying should be harmless) */
147 goto cifs_bp_rename_retry;
149 /* DIR_SEP already set for byte 0 / vs \ but not for
150 subsequent slashes in prepath which currently must
151 be entered the right way - not sure if there is an alternative
152 since the '\' is a valid posix character so we can not switch
153 those safely to '/' if any are found in the middle of the prepath */
154 /* BB test paths to Windows with '/' in the midst of prepath */
157 strncpy(full_path, tcon->treeName, dfsplen);
158 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
160 for (i = 0; i < dfsplen; i++) {
161 if (full_path[i] == '\\')
170 * Don't allow the separator character in a path component.
171 * The VFS will not allow "/", but "\" is allowed by posix.
174 check_name(struct dentry *direntry)
176 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
179 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
180 for (i = 0; i < direntry->d_name.len; i++) {
181 if (direntry->d_name.name[i] == '\\') {
182 cifs_dbg(FYI, "Invalid file name\n");
191 /* Inode operations in similar order to how they appear in Linux file fs.h */
194 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
195 struct tcon_link *tlink, unsigned oflags, umode_t mode,
196 __u32 *oplock, struct cifs_fid *fid, int *created)
199 int create_options = CREATE_NOT_DIR;
201 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
202 struct cifs_tcon *tcon = tlink_tcon(tlink);
203 char *full_path = NULL;
204 FILE_ALL_INFO *buf = NULL;
205 struct inode *newinode = NULL;
207 struct TCP_Server_Info *server = tcon->ses->server;
208 struct cifs_open_parms oparms;
211 if (tcon->ses->server->oplocks)
212 *oplock = REQ_OPLOCK;
214 full_path = build_path_from_dentry(direntry);
215 if (full_path == NULL) {
220 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
221 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
222 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
223 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
224 oflags, oplock, &fid->netfid, xid);
227 if (newinode == NULL) {
228 /* query inode info */
229 goto cifs_create_get_file_info;
232 if (!S_ISREG(newinode->i_mode)) {
234 * The server may allow us to open things like
235 * FIFOs, but the client isn't set up to deal
236 * with that. If it's not a regular file, just
237 * close it and proceed as if it were a normal
240 CIFSSMBClose(xid, tcon, fid->netfid);
241 goto cifs_create_get_file_info;
243 /* success, no need to query */
244 goto cifs_create_set_dentry;
247 goto cifs_create_get_file_info;
252 * EIO could indicate that (posix open) operation is not
253 * supported, despite what server claimed in capability
256 * POSIX open in samba versions 3.3.1 and earlier could
257 * incorrectly fail with invalid parameter.
259 tcon->broken_posix_open = true;
265 * EREMOTE indicates DFS junction, which is not handled
266 * in posix open. If either that or op not supported
267 * returned, follow the normal lookup.
275 * fallthrough to retry, using older open call, this is case
276 * where server does not support this SMB level, and falsely
277 * claims capability (also get here for DFS case which should be
278 * rare for path not covered on files)
283 if (OPEN_FMODE(oflags) & FMODE_READ)
284 desired_access |= GENERIC_READ; /* is this too little? */
285 if (OPEN_FMODE(oflags) & FMODE_WRITE)
286 desired_access |= GENERIC_WRITE;
288 disposition = FILE_OVERWRITE_IF;
289 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
290 disposition = FILE_CREATE;
291 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
292 disposition = FILE_OVERWRITE_IF;
293 else if ((oflags & O_CREAT) == O_CREAT)
294 disposition = FILE_OPEN_IF;
296 cifs_dbg(FYI, "Create flag not set in create function\n");
299 * BB add processing to set equivalent of mode - e.g. via CreateX with
303 if (!server->ops->open) {
308 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
315 * if we're not using unix extensions, see if we need to set
316 * ATTR_READONLY on the create call
318 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
319 create_options |= CREATE_OPTION_READONLY;
321 if (backup_cred(cifs_sb))
322 create_options |= CREATE_OPEN_BACKUP_INTENT;
325 oparms.cifs_sb = cifs_sb;
326 oparms.desired_access = desired_access;
327 oparms.create_options = create_options;
328 oparms.disposition = disposition;
329 oparms.path = full_path;
331 oparms.reconnect = false;
333 rc = server->ops->open(xid, &oparms, oplock, buf);
335 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
340 * If Open reported that we actually created a file then we now have to
341 * set the mode if possible.
343 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
344 struct cifs_unix_set_info_args args = {
346 .ctime = NO_CHANGE_64,
347 .atime = NO_CHANGE_64,
348 .mtime = NO_CHANGE_64,
352 *created |= FILE_CREATED;
353 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
354 args.uid = current_fsuid();
355 if (inode->i_mode & S_ISGID)
356 args.gid = inode->i_gid;
358 args.gid = current_fsgid();
360 args.uid = INVALID_UID; /* no change */
361 args.gid = INVALID_GID; /* no change */
363 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
367 * BB implement mode setting via Windows security
370 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
372 /* Could set r/o dos attribute if mode & 0222 == 0 */
375 cifs_create_get_file_info:
376 /* server might mask mode so we have to query for it */
378 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
381 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
384 if (server->ops->set_lease_key)
385 server->ops->set_lease_key(newinode, fid);
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
387 newinode->i_mode = mode;
388 if ((*oplock & CIFS_CREATE_ACTION) &&
389 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
390 newinode->i_uid = current_fsuid();
391 if (inode->i_mode & S_ISGID)
392 newinode->i_gid = inode->i_gid;
394 newinode->i_gid = current_fsgid();
399 cifs_create_set_dentry:
401 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
403 if (server->ops->close)
404 server->ops->close(xid, tcon, fid);
408 d_add(direntry, newinode);
417 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
418 struct file *file, unsigned oflags, umode_t mode,
423 struct tcon_link *tlink;
424 struct cifs_tcon *tcon;
425 struct TCP_Server_Info *server;
427 struct cifs_pending_open open;
429 struct cifsFileInfo *file_info;
432 * Posix open is only called (at lookup time) for file create now. For
433 * opens (rather than creates), because we do not know if it is a file
434 * or directory yet, and current Samba no longer allows us to do posix
435 * open on dirs, we could end up wasting an open call on what turns out
436 * to be a dir. For file opens, we wait to call posix open till
437 * cifs_open. It could be added to atomic_open in the future but the
438 * performance tradeoff of the extra network request when EISDIR or
439 * EACCES is returned would have to be weighed against the 50% reduction
440 * in network traffic in the other paths.
442 if (!(oflags & O_CREAT)) {
446 * Check for hashed negative dentry. We have already revalidated
447 * the dentry and it is fine. No need to perform another lookup.
449 if (!d_unhashed(direntry))
452 res = cifs_lookup(inode, direntry, 0);
456 return finish_no_open(file, res);
459 rc = check_name(direntry);
465 cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
466 inode, direntry->d_name.name, direntry);
468 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
474 tcon = tlink_tcon(tlink);
475 server = tcon->ses->server;
477 if (server->ops->new_lease_key)
478 server->ops->new_lease_key(&fid);
480 cifs_add_pending_open(&fid, tlink, &open);
482 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
483 &oplock, &fid, opened);
486 cifs_del_pending_open(&open);
490 rc = finish_open(file, direntry, generic_file_open, opened);
492 if (server->ops->close)
493 server->ops->close(xid, tcon, &fid);
494 cifs_del_pending_open(&open);
498 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
499 if (file_info == NULL) {
500 if (server->ops->close)
501 server->ops->close(xid, tcon, &fid);
502 cifs_del_pending_open(&open);
507 cifs_put_tlink(tlink);
513 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
517 unsigned int xid = get_xid();
519 * BB below access is probably too much for mknod to request
520 * but we have to do query and setpathinfo so requesting
521 * less could fail (unless we want to request getatr and setatr
522 * permissions (only). At least for POSIX we do not have to
525 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
526 struct tcon_link *tlink;
527 struct cifs_tcon *tcon;
528 struct TCP_Server_Info *server;
531 int created = FILE_CREATED;
533 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n",
534 inode, direntry->d_name.name, direntry);
536 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
541 tcon = tlink_tcon(tlink);
542 server = tcon->ses->server;
544 if (server->ops->new_lease_key)
545 server->ops->new_lease_key(&fid);
547 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
548 &oplock, &fid, &created);
549 if (!rc && server->ops->close)
550 server->ops->close(xid, tcon, &fid);
552 cifs_put_tlink(tlink);
558 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
563 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
564 struct cifs_sb_info *cifs_sb;
565 struct tcon_link *tlink;
566 struct cifs_tcon *pTcon;
567 struct cifs_io_parms io_parms;
568 char *full_path = NULL;
569 struct inode *newinode = NULL;
572 FILE_ALL_INFO *buf = NULL;
573 unsigned int bytes_written;
574 struct win_dev *pdev;
576 if (!old_valid_dev(device_number))
579 cifs_sb = CIFS_SB(inode->i_sb);
580 tlink = cifs_sb_tlink(cifs_sb);
582 return PTR_ERR(tlink);
584 pTcon = tlink_tcon(tlink);
588 full_path = build_path_from_dentry(direntry);
589 if (full_path == NULL) {
594 if (pTcon->unix_ext) {
595 struct cifs_unix_set_info_args args = {
596 .mode = mode & ~current_umask(),
597 .ctime = NO_CHANGE_64,
598 .atime = NO_CHANGE_64,
599 .mtime = NO_CHANGE_64,
600 .device = device_number,
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
603 args.uid = current_fsuid();
604 args.gid = current_fsgid();
606 args.uid = INVALID_UID; /* no change */
607 args.gid = INVALID_GID; /* no change */
609 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
611 cifs_sb->mnt_cifs_flags &
612 CIFS_MOUNT_MAP_SPECIAL_CHR);
616 rc = cifs_get_inode_info_unix(&newinode, full_path,
620 d_instantiate(direntry, newinode);
624 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
628 cifs_dbg(FYI, "sfu compat create special file\n");
630 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
638 if (backup_cred(cifs_sb))
639 create_options |= CREATE_OPEN_BACKUP_INTENT;
641 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
642 GENERIC_WRITE, create_options,
643 &fileHandle, &oplock, buf, cifs_sb->local_nls,
644 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
648 /* BB Do not bother to decode buf since no local inode yet to put
649 * timestamps in, but we can reuse it safely */
651 pdev = (struct win_dev *)buf;
652 io_parms.netfid = fileHandle;
653 io_parms.pid = current->tgid;
654 io_parms.tcon = pTcon;
656 io_parms.length = sizeof(struct win_dev);
658 memcpy(pdev->type, "IntxCHR", 8);
660 cpu_to_le64(MAJOR(device_number));
662 cpu_to_le64(MINOR(device_number));
663 rc = CIFSSMBWrite(xid, &io_parms,
664 &bytes_written, (char *)pdev,
666 } else if (S_ISBLK(mode)) {
667 memcpy(pdev->type, "IntxBLK", 8);
669 cpu_to_le64(MAJOR(device_number));
671 cpu_to_le64(MINOR(device_number));
672 rc = CIFSSMBWrite(xid, &io_parms,
673 &bytes_written, (char *)pdev,
675 } /* else if (S_ISFIFO) */
676 CIFSSMBClose(xid, pTcon, fileHandle);
679 /* FIXME: add code here to set EAs */
685 cifs_put_tlink(tlink);
690 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
694 int rc = 0; /* to get around spurious gcc warning, set to zero here */
695 struct cifs_sb_info *cifs_sb;
696 struct tcon_link *tlink;
697 struct cifs_tcon *pTcon;
698 struct inode *newInode = NULL;
699 char *full_path = NULL;
703 cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
704 parent_dir_inode, direntry->d_name.name, direntry);
706 /* check whether path exists */
708 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
709 tlink = cifs_sb_tlink(cifs_sb);
712 return (struct dentry *)tlink;
714 pTcon = tlink_tcon(tlink);
716 rc = check_name(direntry);
720 /* can not grab the rename sem here since it would
721 deadlock in the cases (beginning of sys_rename itself)
722 in which we already have the sb rename sem */
723 full_path = build_path_from_dentry(direntry);
724 if (full_path == NULL) {
729 if (direntry->d_inode != NULL) {
730 cifs_dbg(FYI, "non-NULL inode in lookup\n");
732 cifs_dbg(FYI, "NULL inode in lookup\n");
734 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
735 full_path, direntry->d_inode);
737 if (pTcon->unix_ext) {
738 rc = cifs_get_inode_info_unix(&newInode, full_path,
739 parent_dir_inode->i_sb, xid);
741 rc = cifs_get_inode_info(&newInode, full_path, NULL,
742 parent_dir_inode->i_sb, xid, NULL);
745 if ((rc == 0) && (newInode != NULL)) {
746 d_add(direntry, newInode);
747 /* since paths are not looked up by component - the parent
748 directories are presumed to be good here */
749 renew_parental_timestamps(direntry);
751 } else if (rc == -ENOENT) {
753 direntry->d_time = jiffies;
754 d_add(direntry, NULL);
755 /* if it was once a directory (but how can we tell?) we could do
756 shrink_dcache_parent(direntry); */
757 } else if (rc != -EACCES) {
758 cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
759 /* We special case check for Access Denied - since that
760 is a common return code */
765 cifs_put_tlink(tlink);
771 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
773 if (flags & LOOKUP_RCU)
776 if (direntry->d_inode) {
777 if (cifs_revalidate_dentry(direntry))
781 * If the inode wasn't known to be a dfs entry when
782 * the dentry was instantiated, such as when created
783 * via ->readdir(), it needs to be set now since the
784 * attributes will have been updated by
785 * cifs_revalidate_dentry().
787 if (IS_AUTOMOUNT(direntry->d_inode) &&
788 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
789 spin_lock(&direntry->d_lock);
790 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
791 spin_unlock(&direntry->d_lock);
799 * This may be nfsd (or something), anyway, we can't see the
800 * intent of this. So, since this can be for creation, drop it.
806 * Drop the negative dentry, in order to make sure to use the
807 * case sensitive name which is specified by user if this is
810 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
813 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
819 /* static int cifs_d_delete(struct dentry *direntry)
823 cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
828 const struct dentry_operations cifs_dentry_ops = {
829 .d_revalidate = cifs_d_revalidate,
830 .d_automount = cifs_dfs_d_automount,
831 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
834 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
836 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
841 hash = init_name_hash();
842 for (i = 0; i < q->len; i += charlen) {
843 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
844 /* error out if we can't convert the character */
845 if (unlikely(charlen < 0))
847 hash = partial_name_hash(cifs_toupper(c), hash);
849 q->hash = end_name_hash(hash);
854 static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
855 unsigned int len, const char *str, const struct qstr *name)
857 struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
862 * We make the assumption here that uppercase characters in the local
863 * codepage are always the same length as their lowercase counterparts.
865 * If that's ever not the case, then this will fail to match it.
867 if (name->len != len)
870 for (i = 0; i < len; i += l1) {
871 /* Convert characters in both strings to UTF-16. */
872 l1 = codepage->char2uni(&str[i], len - i, &c1);
873 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
876 * If we can't convert either character, just declare it to
877 * be 1 byte long and compare the original byte.
879 if (unlikely(l1 < 0 && l2 < 0)) {
880 if (str[i] != name->name[i])
887 * Here, we again ass|u|me that upper/lowercase versions of
888 * a character are the same length in the local NLS.
893 /* Now compare uppercase versions of these characters */
894 if (cifs_toupper(c1) != cifs_toupper(c2))
901 const struct dentry_operations cifs_ci_dentry_ops = {
902 .d_revalidate = cifs_d_revalidate,
903 .d_hash = cifs_ci_hash,
904 .d_compare = cifs_ci_compare,
905 .d_automount = cifs_dfs_d_automount,