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));
48 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
49 struct cifs_tcon *tcon)
51 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
53 char *full_path = NULL;
55 /* if no prefix path, simply set path to the root of share to "" */
57 full_path = kzalloc(1, GFP_KERNEL);
61 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
62 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
66 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
67 if (full_path == NULL)
71 strncpy(full_path, tcon->treeName, dfsplen);
72 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
73 strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
74 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
75 full_path[dfsplen + pplen] = 0; /* add trailing null */
79 /* Note: caller must free return buffer */
81 build_path_from_dentry(struct dentry *direntry)
88 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
89 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
92 dirsep = CIFS_DIR_SEP(cifs_sb);
93 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
94 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
99 seq = read_seqbegin(&rename_lock);
101 for (temp = direntry; !IS_ROOT(temp);) {
102 namelen += (1 + temp->d_name.len);
103 temp = temp->d_parent;
105 cifs_dbg(VFS, "corrupt dentry\n");
112 full_path = kmalloc(namelen+1, GFP_KERNEL);
113 if (full_path == NULL)
115 full_path[namelen] = 0; /* trailing null */
117 for (temp = direntry; !IS_ROOT(temp);) {
118 spin_lock(&temp->d_lock);
119 namelen -= 1 + temp->d_name.len;
121 spin_unlock(&temp->d_lock);
124 full_path[namelen] = dirsep;
125 strncpy(full_path + namelen + 1, temp->d_name.name,
127 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
129 spin_unlock(&temp->d_lock);
130 temp = temp->d_parent;
132 cifs_dbg(VFS, "corrupt dentry\n");
139 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
140 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
142 /* presumably this is only possible if racing with a rename
143 of one of the parent directories (we can not lock the dentries
144 above us to prevent this, but retrying should be harmless) */
146 goto cifs_bp_rename_retry;
148 /* DIR_SEP already set for byte 0 / vs \ but not for
149 subsequent slashes in prepath which currently must
150 be entered the right way - not sure if there is an alternative
151 since the '\' is a valid posix character so we can not switch
152 those safely to '/' if any are found in the middle of the prepath */
153 /* BB test paths to Windows with '/' in the midst of prepath */
156 strncpy(full_path, tcon->treeName, dfsplen);
157 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
159 for (i = 0; i < dfsplen; i++) {
160 if (full_path[i] == '\\')
169 * Don't allow the separator character in a path component.
170 * The VFS will not allow "/", but "\" is allowed by posix.
173 check_name(struct dentry *direntry)
175 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
178 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
179 for (i = 0; i < direntry->d_name.len; i++) {
180 if (direntry->d_name.name[i] == '\\') {
181 cifs_dbg(FYI, "Invalid file name\n");
190 /* Inode operations in similar order to how they appear in Linux file fs.h */
193 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
194 struct tcon_link *tlink, unsigned oflags, umode_t mode,
195 __u32 *oplock, struct cifs_fid *fid, int *created)
198 int create_options = CREATE_NOT_DIR;
200 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
201 struct cifs_tcon *tcon = tlink_tcon(tlink);
202 char *full_path = NULL;
203 FILE_ALL_INFO *buf = NULL;
204 struct inode *newinode = NULL;
206 struct TCP_Server_Info *server = tcon->ses->server;
209 if (tcon->ses->server->oplocks)
210 *oplock = REQ_OPLOCK;
212 full_path = build_path_from_dentry(direntry);
213 if (full_path == NULL) {
218 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
219 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
220 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
221 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
222 oflags, oplock, &fid->netfid, xid);
225 if (newinode == NULL) {
226 /* query inode info */
227 goto cifs_create_get_file_info;
230 if (!S_ISREG(newinode->i_mode)) {
232 * The server may allow us to open things like
233 * FIFOs, but the client isn't set up to deal
234 * with that. If it's not a regular file, just
235 * close it and proceed as if it were a normal
238 CIFSSMBClose(xid, tcon, fid->netfid);
239 goto cifs_create_get_file_info;
241 /* success, no need to query */
242 goto cifs_create_set_dentry;
245 goto cifs_create_get_file_info;
250 * EIO could indicate that (posix open) operation is not
251 * supported, despite what server claimed in capability
254 * POSIX open in samba versions 3.3.1 and earlier could
255 * incorrectly fail with invalid parameter.
257 tcon->broken_posix_open = true;
263 * EREMOTE indicates DFS junction, which is not handled
264 * in posix open. If either that or op not supported
265 * returned, follow the normal lookup.
273 * fallthrough to retry, using older open call, this is case
274 * where server does not support this SMB level, and falsely
275 * claims capability (also get here for DFS case which should be
276 * rare for path not covered on files)
281 if (OPEN_FMODE(oflags) & FMODE_READ)
282 desired_access |= GENERIC_READ; /* is this too little? */
283 if (OPEN_FMODE(oflags) & FMODE_WRITE)
284 desired_access |= GENERIC_WRITE;
286 disposition = FILE_OVERWRITE_IF;
287 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
288 disposition = FILE_CREATE;
289 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
290 disposition = FILE_OVERWRITE_IF;
291 else if ((oflags & O_CREAT) == O_CREAT)
292 disposition = FILE_OPEN_IF;
294 cifs_dbg(FYI, "Create flag not set in create function\n");
297 * BB add processing to set equivalent of mode - e.g. via CreateX with
301 if (!server->ops->open) {
306 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
313 * if we're not using unix extensions, see if we need to set
314 * ATTR_READONLY on the create call
316 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
317 create_options |= CREATE_OPTION_READONLY;
319 if (backup_cred(cifs_sb))
320 create_options |= CREATE_OPEN_BACKUP_INTENT;
322 rc = server->ops->open(xid, tcon, full_path, disposition,
323 desired_access, create_options, fid, oplock,
326 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
331 * If Open reported that we actually created a file then we now have to
332 * set the mode if possible.
334 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
335 struct cifs_unix_set_info_args args = {
337 .ctime = NO_CHANGE_64,
338 .atime = NO_CHANGE_64,
339 .mtime = NO_CHANGE_64,
343 *created |= FILE_CREATED;
344 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
345 args.uid = current_fsuid();
346 if (inode->i_mode & S_ISGID)
347 args.gid = inode->i_gid;
349 args.gid = current_fsgid();
351 args.uid = INVALID_UID; /* no change */
352 args.gid = INVALID_GID; /* no change */
354 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
358 * BB implement mode setting via Windows security
361 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
363 /* Could set r/o dos attribute if mode & 0222 == 0 */
366 cifs_create_get_file_info:
367 /* server might mask mode so we have to query for it */
369 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
372 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
375 if (server->ops->set_lease_key)
376 server->ops->set_lease_key(newinode, fid);
377 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
378 newinode->i_mode = mode;
379 if ((*oplock & CIFS_CREATE_ACTION) &&
380 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
381 newinode->i_uid = current_fsuid();
382 if (inode->i_mode & S_ISGID)
383 newinode->i_gid = inode->i_gid;
385 newinode->i_gid = current_fsgid();
390 cifs_create_set_dentry:
392 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
394 if (server->ops->close)
395 server->ops->close(xid, tcon, fid);
399 d_add(direntry, newinode);
408 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
409 struct file *file, unsigned oflags, umode_t mode,
414 struct tcon_link *tlink;
415 struct cifs_tcon *tcon;
416 struct TCP_Server_Info *server;
418 struct cifs_pending_open open;
420 struct cifsFileInfo *file_info;
423 * Posix open is only called (at lookup time) for file create now. For
424 * opens (rather than creates), because we do not know if it is a file
425 * or directory yet, and current Samba no longer allows us to do posix
426 * open on dirs, we could end up wasting an open call on what turns out
427 * to be a dir. For file opens, we wait to call posix open till
428 * cifs_open. It could be added to atomic_open in the future but the
429 * performance tradeoff of the extra network request when EISDIR or
430 * EACCES is returned would have to be weighed against the 50% reduction
431 * in network traffic in the other paths.
433 if (!(oflags & O_CREAT)) {
437 * Check for hashed negative dentry. We have already revalidated
438 * the dentry and it is fine. No need to perform another lookup.
440 if (!d_unhashed(direntry))
443 res = cifs_lookup(inode, direntry, 0);
447 return finish_no_open(file, res);
450 rc = check_name(direntry);
456 cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
457 inode, direntry->d_name.name, direntry);
459 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
463 tcon = tlink_tcon(tlink);
464 server = tcon->ses->server;
466 if (server->ops->new_lease_key)
467 server->ops->new_lease_key(&fid);
469 cifs_add_pending_open(&fid, tlink, &open);
471 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
472 &oplock, &fid, opened);
475 cifs_del_pending_open(&open);
479 rc = finish_open(file, direntry, generic_file_open, opened);
481 if (server->ops->close)
482 server->ops->close(xid, tcon, &fid);
483 cifs_del_pending_open(&open);
487 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
488 if (file_info == NULL) {
489 if (server->ops->close)
490 server->ops->close(xid, tcon, &fid);
491 cifs_del_pending_open(&open);
496 cifs_put_tlink(tlink);
502 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
506 unsigned int xid = get_xid();
508 * BB below access is probably too much for mknod to request
509 * but we have to do query and setpathinfo so requesting
510 * less could fail (unless we want to request getatr and setatr
511 * permissions (only). At least for POSIX we do not have to
514 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
515 struct tcon_link *tlink;
516 struct cifs_tcon *tcon;
517 struct TCP_Server_Info *server;
520 int created = FILE_CREATED;
522 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p\n",
523 inode, direntry->d_name.name, direntry);
525 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
530 tcon = tlink_tcon(tlink);
531 server = tcon->ses->server;
533 if (server->ops->new_lease_key)
534 server->ops->new_lease_key(&fid);
536 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
537 &oplock, &fid, &created);
538 if (!rc && server->ops->close)
539 server->ops->close(xid, tcon, &fid);
541 cifs_put_tlink(tlink);
547 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
552 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
553 struct cifs_sb_info *cifs_sb;
554 struct tcon_link *tlink;
555 struct cifs_tcon *pTcon;
556 struct cifs_io_parms io_parms;
557 char *full_path = NULL;
558 struct inode *newinode = NULL;
561 FILE_ALL_INFO *buf = NULL;
562 unsigned int bytes_written;
563 struct win_dev *pdev;
565 if (!old_valid_dev(device_number))
568 cifs_sb = CIFS_SB(inode->i_sb);
569 tlink = cifs_sb_tlink(cifs_sb);
571 return PTR_ERR(tlink);
573 pTcon = tlink_tcon(tlink);
577 full_path = build_path_from_dentry(direntry);
578 if (full_path == NULL) {
583 if (pTcon->unix_ext) {
584 struct cifs_unix_set_info_args args = {
585 .mode = mode & ~current_umask(),
586 .ctime = NO_CHANGE_64,
587 .atime = NO_CHANGE_64,
588 .mtime = NO_CHANGE_64,
589 .device = device_number,
591 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
592 args.uid = current_fsuid();
593 args.gid = current_fsgid();
595 args.uid = INVALID_UID; /* no change */
596 args.gid = INVALID_GID; /* no change */
598 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
600 cifs_sb->mnt_cifs_flags &
601 CIFS_MOUNT_MAP_SPECIAL_CHR);
605 rc = cifs_get_inode_info_unix(&newinode, full_path,
609 d_instantiate(direntry, newinode);
613 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
617 cifs_dbg(FYI, "sfu compat create special file\n");
619 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
627 if (backup_cred(cifs_sb))
628 create_options |= CREATE_OPEN_BACKUP_INTENT;
630 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
631 GENERIC_WRITE, create_options,
632 &fileHandle, &oplock, buf, cifs_sb->local_nls,
633 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
637 /* BB Do not bother to decode buf since no local inode yet to put
638 * timestamps in, but we can reuse it safely */
640 pdev = (struct win_dev *)buf;
641 io_parms.netfid = fileHandle;
642 io_parms.pid = current->tgid;
643 io_parms.tcon = pTcon;
645 io_parms.length = sizeof(struct win_dev);
647 memcpy(pdev->type, "IntxCHR", 8);
649 cpu_to_le64(MAJOR(device_number));
651 cpu_to_le64(MINOR(device_number));
652 rc = CIFSSMBWrite(xid, &io_parms,
653 &bytes_written, (char *)pdev,
655 } else if (S_ISBLK(mode)) {
656 memcpy(pdev->type, "IntxBLK", 8);
658 cpu_to_le64(MAJOR(device_number));
660 cpu_to_le64(MINOR(device_number));
661 rc = CIFSSMBWrite(xid, &io_parms,
662 &bytes_written, (char *)pdev,
664 } /* else if (S_ISFIFO) */
665 CIFSSMBClose(xid, pTcon, fileHandle);
668 /* FIXME: add code here to set EAs */
674 cifs_put_tlink(tlink);
679 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
683 int rc = 0; /* to get around spurious gcc warning, set to zero here */
684 struct cifs_sb_info *cifs_sb;
685 struct tcon_link *tlink;
686 struct cifs_tcon *pTcon;
687 struct inode *newInode = NULL;
688 char *full_path = NULL;
692 cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
693 parent_dir_inode, direntry->d_name.name, direntry);
695 /* check whether path exists */
697 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
698 tlink = cifs_sb_tlink(cifs_sb);
701 return (struct dentry *)tlink;
703 pTcon = tlink_tcon(tlink);
705 rc = check_name(direntry);
709 /* can not grab the rename sem here since it would
710 deadlock in the cases (beginning of sys_rename itself)
711 in which we already have the sb rename sem */
712 full_path = build_path_from_dentry(direntry);
713 if (full_path == NULL) {
718 if (direntry->d_inode != NULL) {
719 cifs_dbg(FYI, "non-NULL inode in lookup\n");
721 cifs_dbg(FYI, "NULL inode in lookup\n");
723 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
724 full_path, direntry->d_inode);
726 if (pTcon->unix_ext) {
727 rc = cifs_get_inode_info_unix(&newInode, full_path,
728 parent_dir_inode->i_sb, xid);
730 rc = cifs_get_inode_info(&newInode, full_path, NULL,
731 parent_dir_inode->i_sb, xid, NULL);
734 if ((rc == 0) && (newInode != NULL)) {
735 d_add(direntry, newInode);
736 /* since paths are not looked up by component - the parent
737 directories are presumed to be good here */
738 renew_parental_timestamps(direntry);
740 } else if (rc == -ENOENT) {
742 direntry->d_time = jiffies;
743 d_add(direntry, NULL);
744 /* if it was once a directory (but how can we tell?) we could do
745 shrink_dcache_parent(direntry); */
746 } else if (rc != -EACCES) {
747 cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
748 /* We special case check for Access Denied - since that
749 is a common return code */
754 cifs_put_tlink(tlink);
760 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
762 if (flags & LOOKUP_RCU)
765 if (direntry->d_inode) {
766 if (cifs_revalidate_dentry(direntry))
770 * If the inode wasn't known to be a dfs entry when
771 * the dentry was instantiated, such as when created
772 * via ->readdir(), it needs to be set now since the
773 * attributes will have been updated by
774 * cifs_revalidate_dentry().
776 if (IS_AUTOMOUNT(direntry->d_inode) &&
777 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
778 spin_lock(&direntry->d_lock);
779 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
780 spin_unlock(&direntry->d_lock);
788 * This may be nfsd (or something), anyway, we can't see the
789 * intent of this. So, since this can be for creation, drop it.
795 * Drop the negative dentry, in order to make sure to use the
796 * case sensitive name which is specified by user if this is
799 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
802 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
808 /* static int cifs_d_delete(struct dentry *direntry)
812 cifs_dbg(FYI, "In cifs d_delete, name = %s\n", direntry->d_name.name);
817 const struct dentry_operations cifs_dentry_ops = {
818 .d_revalidate = cifs_d_revalidate,
819 .d_automount = cifs_dfs_d_automount,
820 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
823 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
826 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
830 hash = init_name_hash();
831 for (i = 0; i < q->len; i++)
832 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
834 q->hash = end_name_hash(hash);
839 static int cifs_ci_compare(const struct dentry *parent,
840 const struct inode *pinode,
841 const struct dentry *dentry, const struct inode *inode,
842 unsigned int len, const char *str, const struct qstr *name)
844 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
846 if ((name->len == len) &&
847 (nls_strnicmp(codepage, name->name, str, len) == 0))
852 const struct dentry_operations cifs_ci_dentry_ops = {
853 .d_revalidate = cifs_d_revalidate,
854 .d_hash = cifs_ci_hash,
855 .d_compare = cifs_ci_compare,
856 .d_automount = cifs_dfs_d_automount,