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diff --git a/xlators/performance/read-ahead/src/read-ahead.h b/xlators/performance/read-ahead/src/read-ahead.h
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+/*
+ Copyright (c) 2006, 2007, 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
+ This file is part of GlusterFS.
+
+ GlusterFS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3 of the License,
+ or (at your option) any later version.
+
+ GlusterFS 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see
+ <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __READ_AHEAD_H
+#define __READ_AHEAD_H
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "common-utils.h"
+
+struct ra_conf;
+struct ra_local;
+struct ra_page;
+struct ra_file;
+struct ra_waitq;
+
+
+struct ra_waitq {
+ struct ra_waitq *next;
+ void *data;
+};
+
+
+struct ra_fill {
+ struct ra_fill *next;
+ struct ra_fill *prev;
+ off_t offset;
+ size_t size;
+ struct iovec *vector;
+ int32_t count;
+ dict_t *refs;
+};
+
+
+struct ra_local {
+ mode_t mode;
+ struct ra_fill fill;
+ off_t offset;
+ size_t size;
+ int32_t op_ret;
+ int32_t op_errno;
+ off_t pending_offset;
+ size_t pending_size;
+ fd_t *fd;
+ int32_t wait_count;
+ pthread_mutex_t local_lock;
+};
+
+
+struct ra_page {
+ struct ra_page *next;
+ struct ra_page *prev;
+ struct ra_file *file;
+ char dirty;
+ char ready;
+ struct iovec *vector;
+ int32_t count;
+ off_t offset;
+ size_t size;
+ struct ra_waitq *waitq;
+ dict_t *ref;
+};
+
+
+struct ra_file {
+ struct ra_file *next;
+ struct ra_file *prev;
+ struct ra_conf *conf;
+ fd_t *fd;
+ int disabled;
+ size_t expected;
+ struct ra_page pages;
+ off_t offset;
+ size_t size;
+ int32_t refcount;
+ pthread_mutex_t file_lock;
+ struct stat stbuf;
+ uint64_t page_size;
+ uint32_t page_count;
+};
+
+
+struct ra_conf {
+ uint64_t page_size;
+ uint32_t page_count;
+ void *cache_block;
+ struct ra_file files;
+ gf_boolean_t force_atime_update;
+ pthread_mutex_t conf_lock;
+};
+
+
+typedef struct ra_conf ra_conf_t;
+typedef struct ra_local ra_local_t;
+typedef struct ra_page ra_page_t;
+typedef struct ra_file ra_file_t;
+typedef struct ra_waitq ra_waitq_t;
+typedef struct ra_fill ra_fill_t;
+
+ra_page_t *
+ra_page_get (ra_file_t *file,
+ off_t offset);
+ra_page_t *
+ra_page_create (ra_file_t *file,
+ off_t offset);
+void
+ra_page_fault (ra_file_t *file,
+ call_frame_t *frame,
+ off_t offset);
+void
+ra_wait_on_page (ra_page_t *page,
+ call_frame_t *frame);
+ra_waitq_t *
+ra_page_wakeup (ra_page_t *page);
+
+void
+ra_page_flush (ra_page_t *page);
+
+ra_waitq_t *
+ra_page_error (ra_page_t *page,
+ int32_t op_ret,
+ int32_t op_errno);
+void
+ra_page_purge (ra_page_t *page);
+
+void
+ra_frame_return (call_frame_t *frame);
+void
+ra_frame_fill (ra_page_t *page,
+ call_frame_t *frame);
+
+void
+ra_file_destroy (ra_file_t *file);
+
+static inline void
+ra_file_lock (ra_file_t *file)
+{
+ pthread_mutex_lock (&file->file_lock);
+}
+
+static inline void
+ra_file_unlock (ra_file_t *file)
+{
+ pthread_mutex_unlock (&file->file_lock);
+}
+
+static inline void
+ra_conf_lock (ra_conf_t *conf)
+{
+ pthread_mutex_lock (&conf->conf_lock);
+}
+
+static inline void
+ra_conf_unlock (ra_conf_t *conf)
+{
+ pthread_mutex_unlock (&conf->conf_lock);
+}
+static inline void
+ra_local_lock (ra_local_t *local)
+{
+ pthread_mutex_lock (&local->local_lock);
+}
+
+static inline void
+ra_local_unlock (ra_local_t *local)
+{
+ pthread_mutex_unlock (&local->local_lock);
+}
+
+#endif /* __READ_AHEAD_H */