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-rw-r--r--fs/cifs/link.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
new file mode 100644
index 00000000000..1455810ba1c
--- /dev/null
+++ b/fs/cifs/link.c
@@ -0,0 +1,328 @@
+/*
+ * fs/cifs/link.c
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2003
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/namei.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+
+int
+cifs_hardlink(struct dentry *old_file, struct inode *inode,
+ struct dentry *direntry)
+{
+ int rc = -EACCES;
+ int xid;
+ char *fromName = NULL;
+ char *toName = NULL;
+ struct cifs_sb_info *cifs_sb_target;
+ struct cifsTconInfo *pTcon;
+ struct cifsInodeInfo *cifsInode;
+
+ xid = GetXid();
+
+ cifs_sb_target = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb_target->tcon;
+
+/* No need to check for cross device links since server will do that
+ BB note DFS case in future though (when we may have to check) */
+
+ down(&inode->i_sb->s_vfs_rename_sem);
+ fromName = build_path_from_dentry(old_file);
+ toName = build_path_from_dentry(direntry);
+ up(&inode->i_sb->s_vfs_rename_sem);
+ if((fromName == NULL) || (toName == NULL)) {
+ rc = -ENOMEM;
+ goto cifs_hl_exit;
+ }
+
+ if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
+ rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
+ cifs_sb_target->local_nls);
+ else {
+ rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
+ cifs_sb_target->local_nls);
+ if(rc == -EIO)
+ rc = -EOPNOTSUPP;
+ }
+
+/* if (!rc) */
+ {
+ /* renew_parental_timestamps(old_file);
+ inode->i_nlink++;
+ mark_inode_dirty(inode);
+ d_instantiate(direntry, inode); */
+ /* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
+ }
+ d_drop(direntry); /* force new lookup from server */
+ cifsInode = CIFS_I(old_file->d_inode);
+ cifsInode->time = 0; /* will force revalidate to go get info when needed */
+
+cifs_hl_exit:
+ if (fromName)
+ kfree(fromName);
+ if (toName)
+ kfree(toName);
+ FreeXid(xid);
+ return rc;
+}
+
+int
+cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
+{
+ struct inode *inode = direntry->d_inode;
+ int rc = -EACCES;
+ int xid;
+ char *full_path = NULL;
+ char * target_path = ERR_PTR(-ENOMEM);
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+
+ xid = GetXid();
+
+ down(&direntry->d_sb->s_vfs_rename_sem);
+ full_path = build_path_from_dentry(direntry);
+ up(&direntry->d_sb->s_vfs_rename_sem);
+
+ if (!full_path)
+ goto out_no_free;
+
+ cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+ target_path = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (!target_path) {
+ target_path = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
+ if (pTcon->ses->capabilities & CAP_UNIX)
+ rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
+ target_path,
+ PATH_MAX-1,
+ cifs_sb->local_nls);
+ else {
+ /* rc = CIFSSMBQueryReparseLinkInfo */
+ /* BB Add code to Query ReparsePoint info */
+ /* BB Add MAC style xsymlink check here if enabled */
+ }
+
+ if (rc == 0) {
+
+/* BB Add special case check for Samba DFS symlinks */
+
+ target_path[PATH_MAX-1] = 0;
+ } else {
+ kfree(target_path);
+ target_path = ERR_PTR(rc);
+ }
+
+out:
+ kfree(full_path);
+out_no_free:
+ FreeXid(xid);
+ nd_set_link(nd, target_path);
+ return 0;
+}
+
+int
+cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
+{
+ int rc = -EOPNOTSUPP;
+ int xid;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+ char *full_path = NULL;
+ struct inode *newinode = NULL;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+ down(&inode->i_sb->s_vfs_rename_sem);
+ full_path = build_path_from_dentry(direntry);
+ up(&inode->i_sb->s_vfs_rename_sem);
+
+ if(full_path == NULL) {
+ FreeXid(xid);
+ return -ENOMEM;
+ }
+
+ cFYI(1, ("Full path: %s ", full_path));
+ cFYI(1, ("symname is %s", symname));
+
+ /* BB what if DFS and this volume is on different share? BB */
+ if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
+ rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
+ cifs_sb->local_nls);
+ /* else
+ rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
+
+ if (rc == 0) {
+ if (pTcon->ses->capabilities & CAP_UNIX)
+ rc = cifs_get_inode_info_unix(&newinode, full_path,
+ inode->i_sb,xid);
+ else
+ rc = cifs_get_inode_info(&newinode, full_path, NULL,
+ inode->i_sb,xid);
+
+ if (rc != 0) {
+ cFYI(1,
+ ("Create symlink worked but get_inode_info failed with rc = %d ",
+ rc));
+ } else {
+ direntry->d_op = &cifs_dentry_ops;
+ d_instantiate(direntry, newinode);
+ }
+ }
+
+ if (full_path)
+ kfree(full_path);
+ FreeXid(xid);
+ return rc;
+}
+
+int
+cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
+{
+ struct inode *inode = direntry->d_inode;
+ int rc = -EACCES;
+ int xid;
+ int oplock = FALSE;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+ char *full_path = NULL;
+ char *tmp_path = NULL;
+ char * tmpbuffer;
+ unsigned char * referrals = NULL;
+ int num_referrals = 0;
+ int len;
+ __u16 fid;
+
+ xid = GetXid();
+ cifs_sb = CIFS_SB(inode->i_sb);
+ pTcon = cifs_sb->tcon;
+
+/* BB would it be safe against deadlock to grab this sem
+ even though rename itself grabs the sem and calls lookup? */
+/* down(&inode->i_sb->s_vfs_rename_sem);*/
+ full_path = build_path_from_dentry(direntry);
+/* up(&inode->i_sb->s_vfs_rename_sem);*/
+
+ if(full_path == NULL) {
+ FreeXid(xid);
+ return -ENOMEM;
+ }
+
+ cFYI(1,
+ ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
+ full_path, inode, pBuffer, buflen));
+ if(buflen > PATH_MAX)
+ len = PATH_MAX;
+ else
+ len = buflen;
+ tmpbuffer = kmalloc(len,GFP_KERNEL);
+ if(tmpbuffer == NULL) {
+ if (full_path)
+ kfree(full_path);
+ FreeXid(xid);
+ return -ENOMEM;
+ }
+
+/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
+ if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
+ rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
+ tmpbuffer,
+ len - 1,
+ cifs_sb->local_nls);
+ else {
+ rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
+ OPEN_REPARSE_POINT,&fid, &oplock, NULL, cifs_sb->local_nls);
+ if(!rc) {
+ rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
+ tmpbuffer,
+ len - 1,
+ fid,
+ cifs_sb->local_nls);
+ if(CIFSSMBClose(xid, pTcon, fid)) {
+ cFYI(1,("Error closing junction point (open for ioctl)"));
+ }
+ if(rc == -EIO) {
+ /* Query if DFS Junction */
+ tmp_path =
+ kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
+ GFP_KERNEL);
+ if (tmp_path) {
+ strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
+ strncat(tmp_path, full_path, MAX_PATHCONF);
+ rc = get_dfs_path(xid, pTcon->ses, tmp_path,
+ cifs_sb->local_nls, &num_referrals, &referrals);
+ cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
+ if((num_referrals == 0) && (rc == 0))
+ rc = -EACCES;
+ else {
+ cFYI(1,("num referral: %d",num_referrals));
+ if(referrals) {
+ cFYI(1,("referral string: %s ",referrals));
+ strncpy(tmpbuffer, referrals, len-1);
+ }
+ }
+ if(referrals)
+ kfree(referrals);
+ kfree(tmp_path);
+}
+ /* BB add code like else decode referrals then memcpy to
+ tmpbuffer and free referrals string array BB */
+ }
+ }
+ }
+ /* BB Anything else to do to handle recursive links? */
+ /* BB Should we be using page ops here? */
+
+ /* BB null terminate returned string in pBuffer? BB */
+ if (rc == 0) {
+ rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
+ cFYI(1,
+ ("vfs_readlink called from cifs_readlink returned %d",
+ rc));
+ }
+
+ if (tmpbuffer) {
+ kfree(tmpbuffer);
+ }
+ if (full_path) {
+ kfree(full_path);
+ }
+ FreeXid(xid);
+ return rc;
+}
+
+void cifs_put_link(struct dentry *direntry, struct nameidata *nd)
+{
+ char *p = nd_get_link(nd);
+ if (!IS_ERR(p))
+ kfree(p);
+}
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