cifs: eliminate redundant xdev check in cifs_rename

The VFS always checks that the source and target of a rename are on the
same vfsmount, and hence have the same superblock. So, this check is
redundant. Remove it and simplify the error handling.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 86a164f..93f77d4 100644 (file)
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1462,28 +1462,17 @@ int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
 {
        char *fromName = NULL;
        char *toName = NULL;
-       struct cifs_sb_info *cifs_sb_source;
-       struct cifs_sb_info *cifs_sb_target;
+       struct cifs_sb_info *cifs_sb;
        struct cifsTconInfo *tcon;
        FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
        FILE_UNIX_BASIC_INFO *info_buf_target;
        int xid, rc, tmprc;
 
-       cifs_sb_target = CIFS_SB(target_dir->i_sb);
-       cifs_sb_source = CIFS_SB(source_dir->i_sb);
-       tcon = cifs_sb_source->tcon;
+       cifs_sb = CIFS_SB(source_dir->i_sb);
+       tcon = cifs_sb->tcon;
 
        xid = GetXid();
 
-       /*
-        * BB: this might be allowed if same server, but different share.
-        * Consider adding support for this
-        */
-       if (tcon != cifs_sb_target->tcon) {
-               rc = -EXDEV;
-               goto cifs_rename_exit;
-       }
-
        /*
         * we already have the rename sem so we do not need to
         * grab it again here to protect the path integrity
@@ -1519,17 +1508,16 @@ int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
                info_buf_target = info_buf_source + 1;
                tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
                                        info_buf_source,
-                                       cifs_sb_source->local_nls,
-                                       cifs_sb_source->mnt_cifs_flags &
+                                       cifs_sb->local_nls,
+                                       cifs_sb->mnt_cifs_flags &
                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
                if (tmprc != 0)
                        goto unlink_target;
 
-               tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
-                                       toName, info_buf_target,
-                                       cifs_sb_target->local_nls,
-                                       /* remap based on source sb */
-                                       cifs_sb_source->mnt_cifs_flags &
+               tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
+                                       info_buf_target,
+                                       cifs_sb->local_nls,
+                                       cifs_sb->mnt_cifs_flags &
                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
 
                if (tmprc == 0 && (info_buf_source->UniqueId ==