1 files changed, 328 insertions, 0 deletions

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
new file mode 100644
index 000000000000..1455810ba1cb
--- /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);
+}