[CIFS] CIFS support for named pipes (part 1)

This allows cifs to mount to ipc shares (IPC$)
which will allow user space applications to
layer over authenticated cifs connections
(useful for Wine and others that would want
to put DCE/RPC over CIFS or run CIFS named
pipes)

Acked-by: Rob Shearman <rob@codeweavers.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 552d68b9d6f4..ece17ca00d08 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -115,7 +115,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
                 inode->i_mode = le64_to_cpu(findData.Permissions);
                 /* since we set the inode type below we need to mask off
                    to avoid strange results if bits set above */
-                        inode->i_mode &= ~S_IFMT;
+                inode->i_mode &= ~S_IFMT;
                 if (type == UNIX_FILE) {
                         inode->i_mode |= S_IFREG;
                 } else if (type == UNIX_SYMLINK) {
@@ -575,19 +575,33 @@ int cifs_get_inode_info(struct inode **pinode,
         return rc;
 }
 
+static const struct inode_operations cifs_ipc_inode_ops = {
+        .lookup = cifs_lookup,
+};
+
 /* gets root inode */
 void cifs_read_inode(struct inode *inode)
 {
-        int xid;
+        int xid, rc;
         struct cifs_sb_info *cifs_sb;
 
         cifs_sb = CIFS_SB(inode->i_sb);
         xid = GetXid();
 
         if (cifs_sb->tcon->unix_ext)
-                cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
+                rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
         else
-                cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
+                rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
+        if (rc && cifs_sb->tcon->ipc) {
+                cFYI(1, ("ipc connection - fake read inode"));
+                inode->i_mode |= S_IFDIR;
+                inode->i_nlink = 2;
+                inode->i_op = &cifs_ipc_inode_ops;
+                inode->i_fop = &simple_dir_operations;
+                inode->i_uid = cifs_sb->mnt_uid;
+                inode->i_gid = cifs_sb->mnt_gid;
+        }
+
         /* can not call macro FreeXid here since in a void func */
         _FreeXid(xid);
 }