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"
36 #include "fs_context.h"
37 #include "cifs_ioctl.h"
40 renew_parental_timestamps(struct dentry *direntry)
42 /* BB check if there is a way to get the kernel to do this or if we
45 cifs_set_time(direntry, jiffies);
46 direntry = direntry->d_parent;
47 } while (!IS_ROOT(direntry));
51 cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
52 struct cifs_tcon *tcon, int add_treename)
54 int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
56 char *full_path = NULL;
58 /* if no prefix path, simply set path to the root of share to "" */
60 full_path = kzalloc(1, GFP_KERNEL);
65 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
69 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
70 if (full_path == NULL)
74 memcpy(full_path, tcon->treeName, dfsplen);
75 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
76 memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
77 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
81 /* Note: caller must free return buffer */
83 build_path_from_dentry(struct dentry *direntry, void *page)
85 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
86 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
87 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
89 return build_path_from_dentry_optional_prefix(direntry, page,
94 build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
99 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
100 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
101 char dirsep = CIFS_DIR_SEP(cifs_sb);
105 return ERR_PTR(-ENOMEM);
108 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
112 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
113 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
115 s = dentry_path_raw(direntry, page, PAGE_SIZE);
118 if (!s[1]) // for root we want "", not "/"
120 if (s < (char *)page + pplen + dfsplen)
121 return ERR_PTR(-ENAMETOOLONG);
123 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
125 memcpy(s + 1, cifs_sb->prepath, pplen - 1);
129 /* BB test paths to Windows with '/' in the midst of prepath */
138 memcpy(s, tcon->treeName, dfsplen);
139 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
141 for (i = 0; i < dfsplen; i++) {
151 * Don't allow path components longer than the server max.
152 * Don't allow the separator character in a path component.
153 * The VFS will not allow "/", but "\" is allowed by posix.
156 check_name(struct dentry *direntry, struct cifs_tcon *tcon)
158 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
161 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
162 direntry->d_name.len >
163 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
164 return -ENAMETOOLONG;
166 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
167 for (i = 0; i < direntry->d_name.len; i++) {
168 if (direntry->d_name.name[i] == '\\') {
169 cifs_dbg(FYI, "Invalid file name\n");
178 /* Inode operations in similar order to how they appear in Linux file fs.h */
181 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
182 struct tcon_link *tlink, unsigned oflags, umode_t mode,
183 __u32 *oplock, struct cifs_fid *fid)
186 int create_options = CREATE_NOT_DIR;
188 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
189 struct cifs_tcon *tcon = tlink_tcon(tlink);
190 const char *full_path;
191 void *page = alloc_dentry_path();
192 FILE_ALL_INFO *buf = NULL;
193 struct inode *newinode = NULL;
195 struct TCP_Server_Info *server = tcon->ses->server;
196 struct cifs_open_parms oparms;
199 if (tcon->ses->server->oplocks)
200 *oplock = REQ_OPLOCK;
202 full_path = build_path_from_dentry(direntry, page);
203 if (IS_ERR(full_path)) {
204 free_dentry_path(page);
205 return PTR_ERR(full_path);
208 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
209 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
210 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
211 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
212 oflags, oplock, &fid->netfid, xid);
215 if (newinode == NULL) {
216 /* query inode info */
217 goto cifs_create_get_file_info;
220 if (S_ISDIR(newinode->i_mode)) {
221 CIFSSMBClose(xid, tcon, fid->netfid);
227 if (!S_ISREG(newinode->i_mode)) {
229 * The server may allow us to open things like
230 * FIFOs, but the client isn't set up to deal
231 * with that. If it's not a regular file, just
232 * close it and proceed as if it were a normal
235 CIFSSMBClose(xid, tcon, fid->netfid);
236 goto cifs_create_get_file_info;
238 /* success, no need to query */
239 goto cifs_create_set_dentry;
242 goto cifs_create_get_file_info;
247 * EIO could indicate that (posix open) operation is not
248 * supported, despite what server claimed in capability
251 * POSIX open in samba versions 3.3.1 and earlier could
252 * incorrectly fail with invalid parameter.
254 tcon->broken_posix_open = true;
260 * EREMOTE indicates DFS junction, which is not handled
261 * in posix open. If either that or op not supported
262 * returned, follow the normal lookup.
270 * fallthrough to retry, using older open call, this is case
271 * where server does not support this SMB level, and falsely
272 * claims capability (also get here for DFS case which should be
273 * rare for path not covered on files)
278 if (OPEN_FMODE(oflags) & FMODE_READ)
279 desired_access |= GENERIC_READ; /* is this too little? */
280 if (OPEN_FMODE(oflags) & FMODE_WRITE)
281 desired_access |= GENERIC_WRITE;
283 disposition = FILE_OVERWRITE_IF;
284 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
285 disposition = FILE_CREATE;
286 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
287 disposition = FILE_OVERWRITE_IF;
288 else if ((oflags & O_CREAT) == O_CREAT)
289 disposition = FILE_OPEN_IF;
291 cifs_dbg(FYI, "Create flag not set in create function\n");
294 * BB add processing to set equivalent of mode - e.g. via CreateX with
298 if (!server->ops->open) {
303 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
310 * if we're not using unix extensions, see if we need to set
311 * ATTR_READONLY on the create call
313 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
314 create_options |= CREATE_OPTION_READONLY;
317 oparms.cifs_sb = cifs_sb;
318 oparms.desired_access = desired_access;
319 oparms.create_options = cifs_create_options(cifs_sb, create_options);
320 oparms.disposition = disposition;
321 oparms.path = full_path;
323 oparms.reconnect = false;
325 rc = server->ops->open(xid, &oparms, oplock, buf);
327 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
332 * If Open reported that we actually created a file then we now have to
333 * set the mode if possible.
335 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
336 struct cifs_unix_set_info_args args = {
338 .ctime = NO_CHANGE_64,
339 .atime = NO_CHANGE_64,
340 .mtime = NO_CHANGE_64,
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 /* TODO: Add support for calling POSIX query info here, but passing in fid */
373 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
376 if (server->ops->set_lease_key)
377 server->ops->set_lease_key(newinode, fid);
378 if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
379 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
380 newinode->i_mode = mode;
381 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
382 newinode->i_uid = current_fsuid();
383 if (inode->i_mode & S_ISGID)
384 newinode->i_gid = inode->i_gid;
386 newinode->i_gid = current_fsgid();
392 cifs_create_set_dentry:
394 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
399 if (S_ISDIR(newinode->i_mode)) {
405 d_add(direntry, newinode);
409 free_dentry_path(page);
413 if (server->ops->close)
414 server->ops->close(xid, tcon, fid);
421 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
422 struct file *file, unsigned oflags, umode_t mode)
426 struct tcon_link *tlink;
427 struct cifs_tcon *tcon;
428 struct TCP_Server_Info *server;
430 struct cifs_pending_open open;
432 struct cifsFileInfo *file_info;
434 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
438 * Posix open is only called (at lookup time) for file create now. For
439 * opens (rather than creates), because we do not know if it is a file
440 * or directory yet, and current Samba no longer allows us to do posix
441 * open on dirs, we could end up wasting an open call on what turns out
442 * to be a dir. For file opens, we wait to call posix open till
443 * cifs_open. It could be added to atomic_open in the future but the
444 * performance tradeoff of the extra network request when EISDIR or
445 * EACCES is returned would have to be weighed against the 50% reduction
446 * in network traffic in the other paths.
448 if (!(oflags & O_CREAT)) {
452 * Check for hashed negative dentry. We have already revalidated
453 * the dentry and it is fine. No need to perform another lookup.
455 if (!d_in_lookup(direntry))
458 res = cifs_lookup(inode, direntry, 0);
462 return finish_no_open(file, res);
467 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
468 inode, direntry, direntry);
470 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
476 tcon = tlink_tcon(tlink);
478 rc = check_name(direntry, tcon);
482 server = tcon->ses->server;
484 if (server->ops->new_lease_key)
485 server->ops->new_lease_key(&fid);
487 cifs_add_pending_open(&fid, tlink, &open);
489 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
493 cifs_del_pending_open(&open);
497 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
498 file->f_mode |= FMODE_CREATED;
500 rc = finish_open(file, direntry, generic_file_open);
502 if (server->ops->close)
503 server->ops->close(xid, tcon, &fid);
504 cifs_del_pending_open(&open);
508 if (file->f_flags & O_DIRECT &&
509 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
510 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
511 file->f_op = &cifs_file_direct_nobrl_ops;
513 file->f_op = &cifs_file_direct_ops;
516 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
517 if (file_info == NULL) {
518 if (server->ops->close)
519 server->ops->close(xid, tcon, &fid);
520 cifs_del_pending_open(&open);
525 cifs_put_tlink(tlink);
531 int cifs_create(struct user_namespace *mnt_userns, struct inode *inode,
532 struct dentry *direntry, umode_t mode, bool excl)
535 unsigned int xid = get_xid();
537 * BB below access is probably too much for mknod to request
538 * but we have to do query and setpathinfo so requesting
539 * less could fail (unless we want to request getatr and setatr
540 * permissions (only). At least for POSIX we do not have to
543 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
544 struct tcon_link *tlink;
545 struct cifs_tcon *tcon;
546 struct TCP_Server_Info *server;
550 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
551 inode, direntry, direntry);
553 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
556 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
561 tcon = tlink_tcon(tlink);
562 server = tcon->ses->server;
564 if (server->ops->new_lease_key)
565 server->ops->new_lease_key(&fid);
567 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
569 if (!rc && server->ops->close)
570 server->ops->close(xid, tcon, &fid);
572 cifs_put_tlink(tlink);
578 int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
579 struct dentry *direntry, umode_t mode, dev_t device_number)
583 struct cifs_sb_info *cifs_sb;
584 struct tcon_link *tlink;
585 struct cifs_tcon *tcon;
586 const char *full_path;
589 if (!old_valid_dev(device_number))
592 cifs_sb = CIFS_SB(inode->i_sb);
593 if (unlikely(cifs_forced_shutdown(cifs_sb)))
596 tlink = cifs_sb_tlink(cifs_sb);
598 return PTR_ERR(tlink);
600 page = alloc_dentry_path();
601 tcon = tlink_tcon(tlink);
604 full_path = build_path_from_dentry(direntry, page);
605 if (IS_ERR(full_path)) {
606 rc = PTR_ERR(full_path);
610 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
615 free_dentry_path(page);
617 cifs_put_tlink(tlink);
622 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
626 int rc = 0; /* to get around spurious gcc warning, set to zero here */
627 struct cifs_sb_info *cifs_sb;
628 struct tcon_link *tlink;
629 struct cifs_tcon *pTcon;
630 struct inode *newInode = NULL;
631 const char *full_path;
636 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
637 parent_dir_inode, direntry, direntry);
639 /* check whether path exists */
641 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
642 tlink = cifs_sb_tlink(cifs_sb);
645 return ERR_CAST(tlink);
647 pTcon = tlink_tcon(tlink);
649 rc = check_name(direntry, pTcon);
651 cifs_put_tlink(tlink);
656 /* can not grab the rename sem here since it would
657 deadlock in the cases (beginning of sys_rename itself)
658 in which we already have the sb rename sem */
659 page = alloc_dentry_path();
660 full_path = build_path_from_dentry(direntry, page);
661 if (IS_ERR(full_path)) {
662 cifs_put_tlink(tlink);
664 free_dentry_path(page);
665 return ERR_CAST(full_path);
668 if (d_really_is_positive(direntry)) {
669 cifs_dbg(FYI, "non-NULL inode in lookup\n");
671 cifs_dbg(FYI, "NULL inode in lookup\n");
673 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
674 full_path, d_inode(direntry));
676 if (pTcon->posix_extensions)
677 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
678 else if (pTcon->unix_ext) {
679 rc = cifs_get_inode_info_unix(&newInode, full_path,
680 parent_dir_inode->i_sb, xid);
682 rc = cifs_get_inode_info(&newInode, full_path, NULL,
683 parent_dir_inode->i_sb, xid, NULL);
687 /* since paths are not looked up by component - the parent
688 directories are presumed to be good here */
689 renew_parental_timestamps(direntry);
690 } else if (rc == -ENOENT) {
691 cifs_set_time(direntry, jiffies);
695 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
696 /* We special case check for Access Denied - since that
697 is a common return code */
699 newInode = ERR_PTR(rc);
701 free_dentry_path(page);
702 cifs_put_tlink(tlink);
704 return d_splice_alias(newInode, direntry);
708 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
713 if (flags & LOOKUP_RCU)
716 if (d_really_is_positive(direntry)) {
717 inode = d_inode(direntry);
718 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
719 CIFS_I(inode)->time = 0; /* force reval */
721 rc = cifs_revalidate_dentry(direntry);
723 cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
728 * Those errors mean the dentry is invalid
729 * (file was deleted or recreated)
734 * Otherwise some unexpected error happened
735 * report it as-is to VFS layer
742 * If the inode wasn't known to be a dfs entry when
743 * the dentry was instantiated, such as when created
744 * via ->readdir(), it needs to be set now since the
745 * attributes will have been updated by
746 * cifs_revalidate_dentry().
748 if (IS_AUTOMOUNT(inode) &&
749 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
750 spin_lock(&direntry->d_lock);
751 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
752 spin_unlock(&direntry->d_lock);
760 * This may be nfsd (or something), anyway, we can't see the
761 * intent of this. So, since this can be for creation, drop it.
767 * Drop the negative dentry, in order to make sure to use the
768 * case sensitive name which is specified by user if this is
771 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
774 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
780 /* static int cifs_d_delete(struct dentry *direntry)
784 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
789 const struct dentry_operations cifs_dentry_ops = {
790 .d_revalidate = cifs_d_revalidate,
791 .d_automount = cifs_dfs_d_automount,
792 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
795 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
797 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
802 hash = init_name_hash(dentry);
803 for (i = 0; i < q->len; i += charlen) {
804 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
805 /* error out if we can't convert the character */
806 if (unlikely(charlen < 0))
808 hash = partial_name_hash(cifs_toupper(c), hash);
810 q->hash = end_name_hash(hash);
815 static int cifs_ci_compare(const struct dentry *dentry,
816 unsigned int len, const char *str, const struct qstr *name)
818 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
823 * We make the assumption here that uppercase characters in the local
824 * codepage are always the same length as their lowercase counterparts.
826 * If that's ever not the case, then this will fail to match it.
828 if (name->len != len)
831 for (i = 0; i < len; i += l1) {
832 /* Convert characters in both strings to UTF-16. */
833 l1 = codepage->char2uni(&str[i], len - i, &c1);
834 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
837 * If we can't convert either character, just declare it to
838 * be 1 byte long and compare the original byte.
840 if (unlikely(l1 < 0 && l2 < 0)) {
841 if (str[i] != name->name[i])
848 * Here, we again ass|u|me that upper/lowercase versions of
849 * a character are the same length in the local NLS.
854 /* Now compare uppercase versions of these characters */
855 if (cifs_toupper(c1) != cifs_toupper(c2))
862 const struct dentry_operations cifs_ci_dentry_ops = {
863 .d_revalidate = cifs_d_revalidate,
864 .d_hash = cifs_ci_hash,
865 .d_compare = cifs_ci_compare,
866 .d_automount = cifs_dfs_d_automount,