cifs: compute full_path already in cifs_readdir()

Cleanup patch for followon to cache additional information for the root directory
when directory lease held.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/readdir.c

@@ -360,11 +360,11 @@ int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
  */
 
 static int
-initiate_cifs_search(const unsigned int xid, struct file *file)
+initiate_cifs_search(const unsigned int xid, struct file *file,
+		     char *full_path)
 {
 	__u16 search_flags;
 	int rc = 0;
-	char *full_path = NULL;
 	struct cifsFileInfo *cifsFile;
 	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 	struct tcon_link *tlink = NULL;
@@ -400,12 +400,6 @@ initiate_cifs_search(const unsigned int xid, struct file *file)
 	cifsFile->invalidHandle = true;
 	cifsFile->srch_inf.endOfSearch = false;
 
-	full_path = build_path_from_dentry(file_dentry(file));
-	if (full_path == NULL) {
-		rc = -ENOMEM;
-		goto error_exit;
-	}
-
 	cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
 
 ffirst_retry:
@@ -444,7 +438,6 @@ initiate_cifs_search(const unsigned int xid, struct file *file)
 		goto ffirst_retry;
 	}
 error_exit:
-	kfree(full_path);
 	cifs_put_tlink(tlink);
 	return rc;
 }
@@ -688,7 +681,8 @@ static int cifs_save_resume_key(const char *current_entry,
  */
 static int
 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
-		struct file *file, char **current_entry, int *num_to_ret)
+		struct file *file, char *full_path,
+		char **current_entry, int *num_to_ret)
 {
 	__u16 search_flags;
 	int rc = 0;
@@ -741,7 +735,7 @@ find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
 						ntwrk_buf_start);
 			cfile->srch_inf.ntwrk_buf_start = NULL;
 		}
-		rc = initiate_cifs_search(xid, file);
+		rc = initiate_cifs_search(xid, file, full_path);
 		if (rc) {
 			cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
 				 rc);
@@ -925,15 +919,22 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
 	char *tmp_buf = NULL;
 	char *end_of_smb;
 	unsigned int max_len;
+	char *full_path = NULL;
 
 	xid = get_xid();
 
+	full_path = build_path_from_dentry(file_dentry(file));
+	if (full_path == NULL) {
+		rc = -ENOMEM;
+		goto rddir2_exit;
+	}
+
 	/*
 	 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
 	 * '..'. Otherwise we won't be able to notify VFS in case of failure.
 	 */
 	if (file->private_data == NULL) {
-		rc = initiate_cifs_search(xid, file);
+		rc = initiate_cifs_search(xid, file, full_path);
 		cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
 		if (rc)
 			goto rddir2_exit;
@@ -960,8 +961,8 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
 	} */
 
 	tcon = tlink_tcon(cifsFile->tlink);
-	rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
-			     &num_to_fill);
+	rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
+			     &current_entry, &num_to_fill);
 	if (rc) {
 		cifs_dbg(FYI, "fce error %d\n", rc);
 		goto rddir2_exit;
@@ -1019,6 +1020,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
 	kfree(tmp_buf);
 
 rddir2_exit:
+	kfree(full_path);
 	free_xid(xid);
 	return rc;
 }