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authorVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
committerVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
commit77adf4cd648dce41f89469dd185deec6b6b53a0b (patch)
tree02e155a5753b398ee572b45793f889b538efab6b /scheduler/rr
parentf3b2e6580e5663292ee113c741343c8a43ee133f (diff)
Added all files
Diffstat (limited to 'scheduler/rr')
-rw-r--r--scheduler/rr/Makefile.am3
-rw-r--r--scheduler/rr/src/Makefile.am13
-rw-r--r--scheduler/rr/src/rr-options.c256
-rw-r--r--scheduler/rr/src/rr-options.h34
-rw-r--r--scheduler/rr/src/rr.c565
-rw-r--r--scheduler/rr/src/rr.h70
6 files changed, 941 insertions, 0 deletions
diff --git a/scheduler/rr/Makefile.am b/scheduler/rr/Makefile.am
new file mode 100644
index 000000000..d471a3f92
--- /dev/null
+++ b/scheduler/rr/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES =
diff --git a/scheduler/rr/src/Makefile.am b/scheduler/rr/src/Makefile.am
new file mode 100644
index 000000000..7e911c0ed
--- /dev/null
+++ b/scheduler/rr/src/Makefile.am
@@ -0,0 +1,13 @@
+sched_LTLIBRARIES = rr.la
+scheddir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/scheduler
+
+rr_la_LDFLAGS = -module -avoidversion
+
+rr_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+rr_la_SOURCES = rr.c rr-options.c
+noinst_HEADERS = rr.h rr-options.h
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+ -I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/scheduler/rr/src/rr-options.c b/scheduler/rr/src/rr-options.c
new file mode 100644
index 000000000..3f0ffcaf2
--- /dev/null
+++ b/scheduler/rr/src/rr-options.c
@@ -0,0 +1,256 @@
+/*
+ Copyright (c) 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/>.
+*/
+
+#include "scheduler.h"
+#include "rr-options.h"
+
+#define RR_LIMITS_MIN_FREE_DISK_OPTION_STRING "scheduler.limits.min-free-disk"
+#define RR_LIMITS_MIN_FREE_DISK_VALUE_DEFAULT 15
+#define RR_LIMITS_MIN_FREE_DISK_VALUE_MIN 0
+#define RR_LIMITS_MIN_FREE_DISK_VALUE_MAX 100
+
+#define RR_REFRESH_INTERVAL_OPTION_STRING "scheduler.refresh-interval"
+#define RR_REFRESH_INTERVAL_VALUE_DEFAULT 10
+
+#define RR_READ_ONLY_SUBVOLUMES_OPTION_STRING "scheduler.read-only-subvolumes"
+
+#define LOG_ERROR(args...) gf_log ("rr-options", GF_LOG_ERROR, ##args)
+#define LOG_WARNING(args...) gf_log ("rr-options", GF_LOG_WARNING, ##args)
+
+static int
+_rr_options_min_free_disk_validate (const char *value_string, uint32_t *n)
+{
+ uint32_t value = 0;
+
+ if (value_string == NULL)
+ {
+ return -1;
+ }
+
+ if (gf_string2percent (value_string, &value) != 0)
+ {
+ gf_log ("rr",
+ GF_LOG_ERROR,
+ "invalid number format [%s] of option [%s]",
+ value_string,
+ RR_LIMITS_MIN_FREE_DISK_OPTION_STRING);
+ return -1;
+ }
+
+ if ((value <= RR_LIMITS_MIN_FREE_DISK_VALUE_MIN) ||
+ (value >= RR_LIMITS_MIN_FREE_DISK_VALUE_MAX))
+ {
+ gf_log ("rr",
+ GF_LOG_ERROR,
+ "out of range [%d] of option [%s]. Allowed range is 0 to 100.",
+ value,
+ RR_LIMITS_MIN_FREE_DISK_OPTION_STRING);
+ return -1;
+ }
+
+ *n = value;
+
+ return 0;
+}
+
+static int
+_rr_options_refresh_interval_validate (const char *value_string, uint32_t *n)
+{
+ uint32_t value = 0;
+
+ if (value_string == NULL)
+ {
+ return -1;
+ }
+
+ if (gf_string2time (value_string, &value) != 0)
+ {
+ gf_log ("rr",
+ GF_LOG_ERROR,
+ "invalid number format [%s] of option [%s]",
+ value_string,
+ RR_REFRESH_INTERVAL_OPTION_STRING);
+ return -1;
+ }
+
+ *n = value;
+
+ return 0;
+}
+
+static int
+_rr_options_read_only_subvolumes_validate (const char *value_string,
+ char ***volume_list,
+ uint64_t *volume_count)
+{
+ char **vlist = NULL;
+ int vcount = 0;
+ int i = 0;
+
+ if (value_string == NULL || volume_list == NULL || volume_count)
+ {
+ return -1;
+ }
+
+ if (gf_strsplit (value_string,
+ ", ",
+ &vlist,
+ &vcount) != 0)
+ {
+ gf_log ("rr",
+ GF_LOG_ERROR,
+ "invalid subvolume list [%s] of option [%s]",
+ value_string,
+ RR_READ_ONLY_SUBVOLUMES_OPTION_STRING);
+ return -1;
+ }
+
+ for (i = 0; i < vcount; i++)
+ {
+ if (gf_volume_name_validate (vlist[i]) != 0)
+ {
+ gf_log ("rr",
+ GF_LOG_ERROR,
+ "invalid subvolume name [%s] in [%s] of option [%s]",
+ vlist[i],
+ value_string,
+ RR_READ_ONLY_SUBVOLUMES_OPTION_STRING);
+ goto free_exit;
+ }
+ }
+
+ *volume_list = vlist;
+ *volume_count = vcount;
+
+ return 0;
+
+ free_exit:
+ for (i = 0; i < vcount; i++)
+ {
+ free (vlist[i]);
+ }
+ free (vlist);
+
+ return -1;
+}
+
+int
+rr_options_validate (dict_t *options, rr_options_t *rr_options)
+{
+ char *value_string = NULL;
+
+ if (options == NULL || rr_options == NULL)
+ {
+ return -1;
+ }
+
+ if (dict_get (options, RR_LIMITS_MIN_FREE_DISK_OPTION_STRING))
+ if (data_to_str (dict_get (options, RR_LIMITS_MIN_FREE_DISK_OPTION_STRING)))
+ value_string = data_to_str (dict_get (options,
+ RR_LIMITS_MIN_FREE_DISK_OPTION_STRING));
+ if (value_string != NULL)
+ {
+ if (_rr_options_min_free_disk_validate (value_string,
+ &rr_options->min_free_disk) != 0)
+ {
+ return -1;
+ }
+
+ gf_log ("rr",
+ GF_LOG_WARNING,
+ "using %s = %d",
+ RR_LIMITS_MIN_FREE_DISK_OPTION_STRING,
+ rr_options->min_free_disk);
+ }
+ else
+ {
+ rr_options->min_free_disk = RR_LIMITS_MIN_FREE_DISK_VALUE_DEFAULT;
+
+ gf_log ("rr", GF_LOG_DEBUG,
+ "using %s = %d [default]",
+ RR_LIMITS_MIN_FREE_DISK_OPTION_STRING,
+ rr_options->min_free_disk);
+ }
+
+ value_string = NULL;
+ if (dict_get (options, RR_REFRESH_INTERVAL_OPTION_STRING))
+ value_string = data_to_str (dict_get (options,
+ RR_REFRESH_INTERVAL_OPTION_STRING));
+ if (value_string != NULL)
+ {
+ if (_rr_options_refresh_interval_validate (value_string,
+ &rr_options->refresh_interval) != 0)
+ {
+ return -1;
+ }
+
+ gf_log ("rr",
+ GF_LOG_WARNING,
+ "using %s = %d",
+ RR_REFRESH_INTERVAL_OPTION_STRING,
+ rr_options->refresh_interval);
+ }
+ else
+ {
+ rr_options->refresh_interval = RR_REFRESH_INTERVAL_VALUE_DEFAULT;
+
+ gf_log ("rr", GF_LOG_DEBUG,
+ "using %s = %d [default]",
+ RR_REFRESH_INTERVAL_OPTION_STRING,
+ rr_options->refresh_interval);
+ }
+
+ value_string = NULL;
+ if (dict_get (options, RR_READ_ONLY_SUBVOLUMES_OPTION_STRING))
+ value_string = data_to_str (dict_get (options,
+ RR_READ_ONLY_SUBVOLUMES_OPTION_STRING));
+ if (value_string != NULL)
+ {
+ if (_rr_options_read_only_subvolumes_validate (value_string,
+ &rr_options->read_only_subvolume_list,
+ &rr_options->read_only_subvolume_count) != 0)
+ {
+ return -1;
+ }
+
+ gf_log ("rr",
+ GF_LOG_WARNING,
+ "using %s = [%s]",
+ RR_READ_ONLY_SUBVOLUMES_OPTION_STRING,
+ value_string);
+ }
+
+ return 0;
+}
+
+struct volume_options options[] = {
+ { .key = { "scheduler.refresh-interval",
+ "rr.refresh-interval" },
+ .type = GF_OPTION_TYPE_TIME
+ },
+ { .key = { "scheduler.limits.min-free-disk",
+ "rr.limits.min-free-disk" },
+ .type = GF_OPTION_TYPE_PERCENT
+ },
+ { .key = { "scheduler.read-only-subvolumes",
+ "rr.read-only-subvolumes" },
+ .type = GF_OPTION_TYPE_ANY
+ },
+ { .key = {NULL} }
+};
diff --git a/scheduler/rr/src/rr-options.h b/scheduler/rr/src/rr-options.h
new file mode 100644
index 000000000..4818c7d49
--- /dev/null
+++ b/scheduler/rr/src/rr-options.h
@@ -0,0 +1,34 @@
+/*
+ Copyright (c) 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 _RR_OPTIONS_H
+#define _RR_OPTIONS_H
+
+struct rr_options
+{
+ uint32_t min_free_disk;
+ uint32_t refresh_interval;
+ char **read_only_subvolume_list;
+ uint64_t read_only_subvolume_count;
+};
+typedef struct rr_options rr_options_t;
+
+int rr_options_validate (dict_t *options, rr_options_t *rr_options);
+
+#endif
diff --git a/scheduler/rr/src/rr.c b/scheduler/rr/src/rr.c
new file mode 100644
index 000000000..3e54ff5e1
--- /dev/null
+++ b/scheduler/rr/src/rr.c
@@ -0,0 +1,565 @@
+/*
+ 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 _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/time.h>
+#include <stdlib.h>
+
+#include <stdint.h>
+
+#include "scheduler.h"
+
+#include "rr-options.h"
+#include "rr.h"
+
+#define RR_MIN_FREE_DISK_NOT_REACHED 0
+#define RR_MIN_FREE_DISK_REACHED 1
+
+#define RR_SUBVOLUME_OFFLINE 0
+#define RR_SUBVOLUME_ONLINE 1
+
+#define LOG_ERROR(args...) gf_log ("rr", GF_LOG_ERROR, ##args)
+#define LOG_WARNING(args...) gf_log ("rr", GF_LOG_WARNING, ##args)
+#define LOG_CRITICAL(args...) gf_log ("rr", GF_LOG_CRITICAL, ##args)
+
+#define ROUND_ROBIN(index, count) ((index + 1) % count)
+
+static int
+_cleanup_rr (rr_t *rr)
+{
+ int i;
+
+ if (rr == NULL)
+ {
+ return -1;
+ }
+
+ if (rr->options.read_only_subvolume_list != NULL)
+ {
+ for (i = 0; i < rr->options.read_only_subvolume_count; i++)
+ {
+ free (rr->options.read_only_subvolume_list[i]);
+ }
+ free (rr->options.read_only_subvolume_list);
+ }
+
+ free (rr->subvolume_list);
+
+ free (rr);
+
+ return 0;
+}
+
+int
+rr_init (xlator_t *this_xl)
+{
+ rr_t *rr = NULL;
+ dict_t *options = NULL;
+ xlator_list_t *children = NULL;
+ uint64_t children_count = 0;
+ int i = 0;
+ int j = 0;
+
+ if (this_xl == NULL)
+ {
+ return -1;
+ }
+
+ if ((options = this_xl->options) == NULL)
+ {
+ return -1;
+ }
+
+ if ((children = this_xl->children) == NULL)
+ {
+ return -1;
+ }
+
+ if ((rr = CALLOC (1, sizeof (rr_t))) == NULL)
+ {
+ return -1;
+ }
+
+ if (rr_options_validate (options, &rr->options) != 0)
+ {
+ free (rr);
+ return -1;
+ }
+
+ for (i = 0; i < rr->options.read_only_subvolume_count; i++)
+ {
+ char found = 0;
+
+ for (children = this_xl->children;
+ children != NULL;
+ children = children->next)
+ {
+ if (strcmp (rr->options.read_only_subvolume_list[i],
+ children->xlator->name) == 0)
+ {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ {
+ LOG_ERROR ("read-only subvolume [%s] not found in volume list",
+ rr->options.read_only_subvolume_list[i]);
+ _cleanup_rr (rr);
+ return -1;
+ }
+ }
+
+ for (children = this_xl->children;
+ children != NULL;
+ children = children->next)
+ {
+ children_count++;
+ }
+
+ /* bala: excluding read_only_subvolumes */
+ if ((rr->subvolume_count = children_count -
+ rr->options.read_only_subvolume_count) == 0)
+ {
+ LOG_ERROR ("no writable volumes found for scheduling");
+ _cleanup_rr (rr);
+ return -1;
+ }
+
+ if ((rr->subvolume_list = CALLOC (rr->subvolume_count,
+ sizeof (rr_subvolume_t))) == NULL)
+ {
+ _cleanup_rr (rr);
+ return -1;
+ }
+
+ i = 0;
+ j = 0;
+ for (children = this_xl->children;
+ children != NULL;
+ children = children->next)
+ {
+ char found = 0;
+
+ for (j = 0; j < rr->options.read_only_subvolume_count; j++)
+ {
+ if (strcmp (rr->options.read_only_subvolume_list[i],
+ children->xlator->name) == 0)
+ {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ {
+ rr_subvolume_t *subvolume = NULL;
+
+ subvolume = &rr->subvolume_list[i];
+
+ subvolume->xl = children->xlator;
+ subvolume->free_disk_status = RR_MIN_FREE_DISK_NOT_REACHED;
+ subvolume->status = RR_SUBVOLUME_ONLINE;
+
+ i++;
+ }
+ }
+
+ rr->schedule_index = UINT64_MAX;
+ rr->last_stat_fetched_time.tv_sec = 0;
+ rr->last_stat_fetched_time.tv_usec = 0;
+ pthread_mutex_init (&rr->mutex, NULL);
+
+ *((long *)this_xl->private) = (long)rr;
+
+ return 0;
+}
+
+void
+rr_fini (xlator_t *this_xl)
+{
+ rr_t *rr = NULL;
+
+ if (this_xl == NULL)
+ {
+ return;
+ }
+
+ if ((rr = (rr_t *) *((long *)this_xl->private)) != NULL)
+ {
+ pthread_mutex_destroy (&rr->mutex);
+ _cleanup_rr (rr);
+ this_xl->private = NULL;
+ }
+
+ return;
+}
+
+xlator_t *
+rr_schedule (xlator_t *this_xl, const void *path)
+{
+ rr_t *rr = NULL;
+ uint64_t next_schedule_index = 0;
+ int i = 0;
+
+ if (this_xl == NULL || path == NULL)
+ {
+ return NULL;
+ }
+
+ rr = (rr_t *) *((long *)this_xl->private);
+ next_schedule_index = ROUND_ROBIN (rr->schedule_index,
+ rr->subvolume_count);
+
+ rr_update (this_xl);
+
+ for (i = next_schedule_index; i < rr->subvolume_count; i++)
+ {
+ if (rr->subvolume_list[i].status == RR_SUBVOLUME_ONLINE &&
+ rr->subvolume_list[i].status == RR_MIN_FREE_DISK_NOT_REACHED)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ rr->schedule_index = i;
+ pthread_mutex_unlock (&rr->mutex);
+ return rr->subvolume_list[i].xl;
+ }
+ }
+
+ for (i = 0; i < next_schedule_index; i++)
+ {
+ if (rr->subvolume_list[i].status == RR_SUBVOLUME_ONLINE &&
+ rr->subvolume_list[i].status == RR_MIN_FREE_DISK_NOT_REACHED)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ rr->schedule_index = i;
+ pthread_mutex_unlock (&rr->mutex);
+ return rr->subvolume_list[i].xl;
+ }
+ }
+
+ for (i = next_schedule_index; i < rr->subvolume_count; i++)
+ {
+ if (rr->subvolume_list[i].status == RR_SUBVOLUME_ONLINE)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ rr->schedule_index = i;
+ pthread_mutex_unlock (&rr->mutex);
+ return rr->subvolume_list[i].xl;
+ }
+ }
+
+ for (i = 0; i < next_schedule_index; i++)
+ {
+ if (rr->subvolume_list[i].status == RR_SUBVOLUME_ONLINE)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ rr->schedule_index = i;
+ pthread_mutex_unlock (&rr->mutex);
+ return rr->subvolume_list[i].xl;
+ }
+ }
+
+ return NULL;
+}
+
+void
+rr_update (xlator_t *this_xl)
+{
+ rr_t *rr = NULL;
+ struct timeval ctime = {0, 0};
+ int i = 0;
+
+ if (this_xl == NULL)
+ {
+ return ;
+ }
+
+ if ((rr = (rr_t *) *((long *)this_xl->private)) == NULL)
+ {
+ return ;
+ }
+
+ if (gettimeofday (&ctime, NULL) != 0)
+ {
+ return ;
+ }
+
+ if (ctime.tv_sec > (rr->options.refresh_interval +
+ rr->last_stat_fetched_time.tv_sec))
+ {
+ pthread_mutex_lock (&rr->mutex);
+ rr->last_stat_fetched_time = ctime;
+ pthread_mutex_unlock (&rr->mutex);
+
+ for (i = 0; i < rr->subvolume_count; i++)
+ {
+ xlator_t *subvolume_xl = NULL;
+ call_frame_t *frame = NULL;
+ call_pool_t *pool = NULL;
+
+ subvolume_xl = rr->subvolume_list[i].xl;
+
+ pool = this_xl->ctx->pool;
+
+ frame = create_frame (this_xl, pool);
+
+ STACK_WIND_COOKIE (frame,
+ rr_update_cbk,
+ subvolume_xl->name,
+ subvolume_xl,
+ subvolume_xl->mops->stats,
+ 0);
+ }
+ }
+
+ return ;
+}
+
+int
+rr_update_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this_xl,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct xlator_stats *stats)
+{
+ rr_t *rr = NULL;
+ rr_subvolume_t *subvolume = NULL;
+ uint8_t free_disk_percent = 0;
+ int i = 0;
+
+ if (frame == NULL)
+ {
+ return -1;
+ }
+
+ if (cookie == NULL || this_xl == NULL)
+ {
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ if (op_ret == 0 && stats == NULL)
+ {
+ LOG_CRITICAL ("fatal! op_ret is 0 and stats is NULL. "
+ "Please report this to <gluster-devel@nongnu.org>");
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ if ((rr = (rr_t *) *((long *)this_xl->private)) == NULL)
+ {
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ for (i = 0; i < rr->subvolume_count; i++)
+ {
+ if (rr->subvolume_list[i].xl->name == (char *) cookie)
+ {
+ subvolume = &rr->subvolume_list[i];
+ break;
+ }
+ }
+
+ if (subvolume == NULL)
+ {
+ LOG_ERROR ("unknown cookie [%s]", (char *) cookie);
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ if (op_ret == 0)
+ {
+ free_disk_percent = (stats->free_disk * 100) / stats->total_disk_size;
+ if (free_disk_percent > rr->options.min_free_disk)
+ {
+ if (subvolume->free_disk_status != RR_MIN_FREE_DISK_NOT_REACHED)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ subvolume->free_disk_status = RR_MIN_FREE_DISK_NOT_REACHED;
+ pthread_mutex_unlock (&rr->mutex);
+ LOG_WARNING ("subvolume [%s] is available with free space for scheduling",
+ subvolume->xl->name);
+ }
+ }
+ else
+ {
+ if (subvolume->free_disk_status != RR_MIN_FREE_DISK_REACHED)
+ {
+ pthread_mutex_lock (&rr->mutex);
+ subvolume->free_disk_status = RR_MIN_FREE_DISK_REACHED;
+ pthread_mutex_unlock (&rr->mutex);
+ LOG_WARNING ("subvolume [%s] reached minimum disk space requirement",
+ subvolume->xl->name);
+ }
+ }
+ }
+ else
+ {
+ pthread_mutex_lock (&rr->mutex);
+ subvolume->status = RR_SUBVOLUME_OFFLINE;
+ pthread_mutex_unlock (&rr->mutex);
+ LOG_ERROR ("unable to get subvolume [%s] status information and "
+ "scheduling is disabled",
+ subvolume->xl->name);
+ }
+
+ STACK_DESTROY (frame->root);
+ return 0;
+}
+
+void
+rr_notify (xlator_t *this_xl, int32_t event, void *data)
+{
+ rr_t *rr = NULL;
+ rr_subvolume_t *subvolume = NULL;
+ xlator_t *subvolume_xl = NULL;
+ int i = 0, ret = 0;
+ call_frame_t *frame = NULL;
+ call_pool_t *pool = NULL;
+ dict_t *xattr = get_new_dict ();
+ int32_t version[1] = {1};
+
+ if (this_xl == NULL || data == NULL) {
+ return ;
+ }
+
+ if ((rr = (rr_t *) *((long *)this_xl->private)) == NULL) {
+ return ;
+ }
+
+ subvolume_xl = (xlator_t *) data;
+
+ for (i = 0; i < rr->subvolume_count; i++) {
+ if (rr->subvolume_list[i].xl == subvolume_xl) {
+ subvolume = &rr->subvolume_list[i];
+ break;
+ }
+ }
+
+ switch (event) {
+ case GF_EVENT_CHILD_UP:
+ /* Seeding, to be done only once */
+ if (rr->first_time && (i == rr->subvolume_count)) {
+ loc_t loc = {0,};
+ xlator_t *trav = NULL;
+
+ pool = this_xl->ctx->pool;
+ frame = create_frame (this_xl, pool);
+ ret = dict_set_bin (xattr, "trusted.glusterfs.scheduler.rr",
+ version, sizeof (int32_t));
+ if (-1 == ret) {
+ gf_log (this_xl->name, GF_LOG_ERROR, "rr seed setting failed");
+ }
+ if (xattr)
+ dict_ref (xattr);
+
+ loc.path = strdup ("/");
+ for (trav = this_xl->parents->xlator; trav; trav = trav->parents->xlator) {
+ if (trav->itable) {
+ loc.inode = trav->itable->root;
+ break;
+ }
+ }
+ STACK_WIND (frame,
+ rr_notify_cbk,
+ (xlator_t *)data,
+ ((xlator_t *)data)->fops->xattrop,
+ &loc,
+ GF_XATTROP_ADD_ARRAY,
+ xattr);
+
+ if (xattr)
+ dict_unref (xattr);
+
+ rr->first_time = 0;
+ }
+ if (subvolume) {
+ pthread_mutex_lock (&rr->mutex);
+ subvolume->status = RR_SUBVOLUME_ONLINE;
+ pthread_mutex_unlock (&rr->mutex);
+ }
+ break;
+ case GF_EVENT_CHILD_DOWN:
+ if (subvolume) {
+ pthread_mutex_lock (&rr->mutex);
+ subvolume->status = RR_SUBVOLUME_OFFLINE;
+ pthread_mutex_unlock (&rr->mutex);
+ }
+ break;
+ }
+
+ return ;
+}
+
+int
+rr_notify_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this_xl,
+ int32_t op_ret,
+ int32_t op_errno,
+ dict_t *xattr)
+{
+ rr_t *rr = NULL;
+ int32_t *index = NULL;
+ int32_t ret = -1;
+ void *tmp_index_ptr = NULL;
+
+ if (frame == NULL)
+ {
+ return -1;
+ }
+
+ if ((this_xl == NULL) || (op_ret == -1))
+ {
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ if ((rr = (rr_t *) *((long *)this_xl->private)) == NULL)
+ {
+ STACK_DESTROY (frame->root);
+ return -1;
+ }
+
+ ret = dict_get_bin (xattr, "trusted.glusterfs.scheduler.rr", &tmp_index_ptr);
+ index = tmp_index_ptr;
+ if (ret == 0)
+ rr->schedule_index = (index[0] % rr->subvolume_count);
+ else
+ rr->schedule_index = 0;
+
+ STACK_DESTROY (frame->root);
+ return 0;
+}
+
+struct sched_ops sched = {
+ .init = rr_init,
+ .fini = rr_fini,
+ .update = rr_update,
+ .schedule = rr_schedule,
+ .notify = rr_notify
+};
+
diff --git a/scheduler/rr/src/rr.h b/scheduler/rr/src/rr.h
new file mode 100644
index 000000000..baa471209
--- /dev/null
+++ b/scheduler/rr/src/rr.h
@@ -0,0 +1,70 @@
+/*
+ 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 _RR_H
+#define _RR_H
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "scheduler.h"
+#include <stdint.h>
+#include <sys/time.h>
+
+struct rr_subvolume
+{
+ xlator_t *xl;
+ uint8_t free_disk_status;
+ uint8_t status;
+};
+typedef struct rr_subvolume rr_subvolume_t;
+
+struct rr
+{
+ rr_options_t options;
+ rr_subvolume_t *subvolume_list;
+ uint64_t subvolume_count;
+ uint64_t schedule_index;
+ struct timeval last_stat_fetched_time;
+ pthread_mutex_t mutex;
+ char first_time;
+};
+typedef struct rr rr_t;
+
+int rr_init (xlator_t *this_xl);
+void rr_fini (xlator_t *this_xl);
+xlator_t *rr_schedule (xlator_t *this_xl, const void *path);
+void rr_update (xlator_t *this_xl);
+int rr_update_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this_xl,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct xlator_stats *stats);
+void rr_notify (xlator_t *this_xl, int32_t event, void *data);
+int rr_notify_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this_xl,
+ int32_t op_ret,
+ int32_t op_errno,
+ dict_t *xattr);
+
+#endif /* _RR_H */