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-rw-r--r--libglusterfs/src/rot-buffs.h121
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diff --git a/libglusterfs/src/rot-buffs.h b/libglusterfs/src/rot-buffs.h
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+++ b/libglusterfs/src/rot-buffs.h
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+/*
+ Copyright (c) 2008-2015 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+*/
+
+#ifndef __ROT_BUFFS_H
+#define __ROT_BUFFS_H
+
+#include "list.h"
+#include "locking.h"
+#include "common-utils.h"
+
+typedef struct rbuf_iovec {
+ struct iovec iov;
+
+ struct list_head list;
+} rbuf_iovec_t;
+
+#define RBUF_IOVEC_SIZE (sizeof (rbuf_iovec_t))
+
+typedef struct rbuf_list {
+ gf_lock_t c_lock;
+
+ pthread_mutex_t b_lock; /* protects this structure */
+ pthread_cond_t b_cond; /* signal for writer completion */
+
+ gf_boolean_t awaiting;
+
+ unsigned long long pending; /* pending writers */
+ unsigned long long completed; /* completed writers */
+
+ rbuf_iovec_t *rvec; /* currently used IO vector */
+
+ struct list_head veclist; /* list of attached rbuf_iov */
+
+ unsigned long long used; /* consumable entries
+ attached in ->veclist */
+ unsigned long long total; /* total entries in ->veclist (used
+ during deallocation) */
+
+ unsigned long seq[2]; /* if interested, this whould store
+ the start sequence number and the
+ range */
+
+ struct list_head list; /* attachment to rbuf_t */
+} rbuf_list_t;
+
+struct rlist_iter {
+ struct list_head veclist;
+
+ unsigned long long iter;
+};
+
+#define RLIST_ENTRY_COUNT(rlist) rlist->used
+
+#define rlist_iter_init(riter, rlist) \
+ do { \
+ (riter)->iter = rlist->used; \
+ (riter)->veclist = rlist->veclist; \
+ } while (0)
+
+#define rvec_for_each_entry(pos, riter) \
+ for (pos = list_entry \
+ ((riter)->veclist.next, typeof(*pos), list); \
+ (riter)->iter > 0; \
+ pos = list_entry \
+ (pos->list.next, typeof(*pos), list), \
+ --((riter)->iter))
+
+/**
+ * Sequence number assigment routine is called during buffer
+ * switch under rbuff ->lock.
+ */
+typedef void (sequence_fn) (rbuf_list_t *, void *);
+
+#define RLIST_STORE_SEQ(rlist, start, range) \
+ do { \
+ rlist->seq[0] = start; \
+ rlist->seq[1] = range; \
+ } while (0)
+
+#define RLIST_GET_SEQ(rlist, start, range) \
+ do { \
+ start = rlist->seq[0]; \
+ range = rlist->seq[1]; \
+ } while (0)
+
+typedef struct rbuf {
+ gf_lock_t lock; /* protects "current" rlist */
+
+ rbuf_list_t *current; /* cached pointer to first free rlist */
+
+ struct list_head freelist;
+} rbuf_t;
+
+typedef enum {
+ RBUF_CONSUMABLE = 1,
+ RBUF_BUSY,
+ RBUF_EMPTY,
+ RBUF_WOULD_STARVE,
+} rlist_retval_t;
+
+/* Initialization/Destruction */
+rbuf_t *rbuf_init (int);
+void rbuf_dtor (rbuf_t *);
+
+/* Producer API */
+char *rbuf_reserve_write_area (rbuf_t *, size_t, void **);
+int rbuf_write_complete (void *);
+
+/* Consumer API */
+int rbuf_get_buffer (rbuf_t *, void **, sequence_fn *, void *);
+int rbuf_wait_for_completion (rbuf_t *, void *,
+ void (*)(rbuf_list_t *, void *), void *);
+
+#endif