Added all files

3 files changed, 413 insertions, 0 deletions

diff --git a/scheduler/switch/Makefile.am b/scheduler/switch/Makefile.am
new file mode 100644
index 00000000000..d471a3f9243
--- /dev/null
+++ b/scheduler/switch/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES = 
diff --git a/scheduler/switch/src/Makefile.am b/scheduler/switch/src/Makefile.am
new file mode 100644
index 00000000000..dc7d16d40d2
--- /dev/null
+++ b/scheduler/switch/src/Makefile.am
@@ -0,0 +1,12 @@
+sched_LTLIBRARIES = switch.la
+scheddir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/scheduler
+
+switch_la_LDFLAGS = -module -avoidversion
+
+switch_la_SOURCES = switch.c
+switch_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+	-I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES = 
diff --git a/scheduler/switch/src/switch.c b/scheduler/switch/src/switch.c
new file mode 100644
index 00000000000..70b3071871d
--- /dev/null
+++ b/scheduler/switch/src/switch.c
@@ -0,0 +1,398 @@
+/*
+  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/>.
+*/
+
+#include <sys/time.h>
+#include <stdlib.h>
+#include <fnmatch.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "scheduler.h"
+
+struct switch_sched_array {
+	xlator_t *xl;
+	int32_t   eligible;
+	int32_t   considered;
+};
+
+/* Select one of this struct based on the path's pattern match */
+struct switch_sched_struct {
+	struct switch_sched_struct *next;
+	struct switch_sched_array  *array;
+	char                        path_pattern[256];
+	int32_t                     node_index; /* Index of the node in 
+						   this pattern. */
+	int32_t                     num_child;  /* Total num of child nodes 
+						   with this pattern. */
+};
+
+struct switch_struct {
+	struct switch_sched_struct *cond;
+	struct switch_sched_array  *array;
+	pthread_mutex_t             switch_mutex;
+	int32_t                     child_count;
+};
+
+/* This function should return child node as '*:subvolumes' is inserterd */
+static xlator_t *
+switch_get_matching_xl (const char *path, struct switch_sched_struct *cond)
+{
+	struct switch_sched_struct *trav      = cond;
+	char                       *pathname  = strdup (path);
+	int                         index     = 0;
+
+	while (trav) {
+		if (fnmatch (trav->path_pattern, 
+			     pathname, FNM_NOESCAPE) == 0) {
+			free (pathname);
+			trav->node_index %= trav->num_child;
+			index = (trav->node_index++) % trav->num_child;
+			return trav->array[index].xl;
+		}
+		trav = trav->next;
+	}
+	free (pathname);
+	return NULL;
+}
+
+
+static int32_t
+switch_init (xlator_t *xl)
+{
+	int32_t index = 0;
+	data_t *data = NULL;
+	char *child = NULL;
+	char *tmp = NULL;
+	char *childs_data = NULL;
+	xlator_list_t *trav_xl = xl->children;
+	struct switch_struct *switch_buf = NULL;
+  
+	switch_buf = CALLOC (1, sizeof (struct switch_struct));
+	ERR_ABORT (switch_buf);
+
+	while (trav_xl) {
+		index++;
+		trav_xl = trav_xl->next;
+	}
+	switch_buf->child_count = index;
+	switch_buf->array = CALLOC (index + 1, 
+				    sizeof (struct switch_sched_struct));
+	ERR_ABORT (switch_buf->array);
+	trav_xl = xl->children;
+	index = 0;
+
+	while (trav_xl) {
+		switch_buf->array[index].xl = trav_xl->xlator;
+		switch_buf->array[index].eligible = 1;
+		trav_xl = trav_xl->next;
+		index++;
+	}
+
+	data = dict_get (xl->options, "scheduler.read-only-subvolumes");
+	if (data) {
+		childs_data = strdup (data->data);
+		child = strtok_r (childs_data, ",", &tmp);
+		while (child) {
+			for (index = 1; 
+			     index < switch_buf->child_count; index++) {
+				if (strcmp (switch_buf->array[index - 1].xl->name, child) == 0) {
+					gf_log ("switch", GF_LOG_DEBUG, 
+						"Child '%s' is read-only", 
+						child);
+					memcpy (&(switch_buf->array[index-1]),
+						&(switch_buf->array[switch_buf->child_count - 1]), 
+						sizeof (struct switch_sched_array));
+					switch_buf->child_count--;
+					break;
+				}
+			}
+			child = strtok_r (NULL, ",", &tmp);
+		}
+		free (childs_data);
+	}
+
+	data = dict_get (xl->options, "scheduler.local-volume-name");
+	if (data) {
+		/* Means, give preference to that node first */
+		gf_log ("switch", GF_LOG_DEBUG, 
+			"local volume defined as %s", data->data);
+
+		/* TODO: parse it properly, have an extra index to 
+		   specify that first */
+	}
+
+	/*  *jpg:child1,child2;*mpg:child3;*:child4,child5,child6 */
+	data = dict_get (xl->options, "scheduler.switch.case");
+	if (data) {
+		char *tmp_str = NULL; 
+		char *tmp_str1 = NULL;
+		char *dup_str = NULL;
+		char *switch_str = NULL;
+		char *pattern = NULL;
+		char *childs = NULL;
+		struct switch_sched_struct *switch_opt = NULL;
+		struct switch_sched_struct *trav = NULL;
+		/* Get the pattern for considering switch case. 
+		   "option block-size *avi:10MB" etc */
+		switch_str = strtok_r (data->data, ";", &tmp_str);
+		while (switch_str) {
+			dup_str = strdup (switch_str);
+			switch_opt = 
+				CALLOC (1, 
+					sizeof (struct switch_sched_struct));
+			ERR_ABORT (switch_opt);
+
+			/* Link it to the main structure */
+			if (switch_buf->cond) {
+				/* there are already few entries */
+				trav = switch_buf->cond;
+				while (trav->next)
+					trav = trav->next;
+				trav->next = switch_opt;
+			} else {
+				/* First entry */
+				switch_buf->cond = switch_opt;
+			}
+			pattern = strtok_r (dup_str, ":", &tmp_str1);
+			childs = strtok_r (NULL, ":", &tmp_str1);
+			if (strncmp (pattern, "*", 2) == 0) {
+				gf_log ("switch", GF_LOG_WARNING,
+					"'*' pattern will be taken by default "
+					"for all the unconfigured child nodes,"
+					" hence neglecting current option");
+				switch_str = strtok_r (NULL, ";", &tmp_str);
+				free (dup_str);
+				continue;
+			}
+			memcpy (switch_opt->path_pattern, 
+				pattern, strlen (pattern));
+			if (childs) {
+				int32_t idx = 0;
+				char *tmp1 = NULL;
+				char *dup_childs = NULL;
+				/* TODO: get the list of child nodes for 
+				   the given pattern */
+				dup_childs = strdup (childs);
+				child = strtok_r (dup_childs, ",", &tmp);
+				while (child) {
+					idx++;
+					child = strtok_r (NULL, ",", &tmp);
+				}
+				free (dup_childs);
+				child = strtok_r (childs, ",", &tmp1);
+				switch_opt->num_child = idx;
+				switch_opt->array = 
+					CALLOC (1, idx * sizeof (struct switch_sched_array));
+				ERR_ABORT (switch_opt->array);
+				idx = 0;
+				child = strtok_r (childs, ",", &tmp);
+				while (child) {
+					for (index = 1; 
+					     index < switch_buf->child_count; 
+					     index++) {
+						if (strcmp (switch_buf->array[index - 1].xl->name, 
+							    child) == 0) {
+							gf_log ("switch", 
+								GF_LOG_DEBUG,
+								"'%s' pattern will be scheduled to \"%s\"",
+								switch_opt->path_pattern, child);
+							/*
+							  if (switch_buf->array[index-1].considered) {
+							  gf_log ("switch", GF_LOG_DEBUG, 
+							  "ambiguity found, exiting");
+							  return -1;
+							  }
+							*/
+							switch_opt->array[idx].xl = switch_buf->array[index-1].xl;
+							switch_buf->array[index-1].considered = 1;
+							idx++;
+							break;
+						}
+					}
+					child = strtok_r (NULL, ",", &tmp1);
+				}
+			} else {
+				/* error */
+				gf_log ("switch", GF_LOG_ERROR, 
+					"Check \"scheduler.switch.case\" "
+					"option in unify volume. Exiting");
+				free (switch_buf->array);
+				free (switch_buf);
+				return -1;
+			}
+			free (dup_str);
+			switch_str = strtok_r (NULL, ";", &tmp_str);
+		}
+	}
+	/* Now, all the pattern based considerations done, so for all the 
+	 * remaining pattern, '*' to all the remaining child nodes
+	 */
+	{
+		struct switch_sched_struct *switch_opt = NULL;
+		int32_t flag = 0;
+		int32_t index = 0;
+		for (index=0; index < switch_buf->child_count; index++) {
+			/* check for considered flag */
+			if (switch_buf->array[index].considered)
+				continue;
+			flag++;
+		}
+		if (!flag) {
+			gf_log ("switch", GF_LOG_ERROR,
+				"No nodes left for pattern '*'. Exiting.");
+			return -1;
+		}
+		switch_opt = CALLOC (1, sizeof (struct switch_sched_struct));
+		ERR_ABORT (switch_opt);
+		if (switch_buf->cond) {
+			/* there are already few entries */
+			struct switch_sched_struct *trav = switch_buf->cond;
+			while (trav->next)
+				trav = trav->next;
+			trav->next = switch_opt;
+		} else {
+			/* First entry */
+			switch_buf->cond = switch_opt;
+		}
+		/* Add the '*' pattern to the array */
+		memcpy (switch_opt->path_pattern, "*", 2);
+		switch_opt->num_child = flag;
+		switch_opt->array = 
+			CALLOC (1, flag * sizeof (struct switch_sched_array));
+		ERR_ABORT (switch_opt->array);
+		flag = 0;
+		for (index=0; index < switch_buf->child_count; index++) {
+			/* check for considered flag */
+			if (switch_buf->array[index].considered)
+				continue;
+			gf_log ("switch", GF_LOG_DEBUG,
+				"'%s' pattern will be scheduled to \"%s\"",
+				switch_opt->path_pattern, 
+				switch_buf->array[index].xl->name);
+			switch_opt->array[flag].xl = 
+				switch_buf->array[index].xl;
+			switch_buf->array[index].considered = 1;
+			flag++;
+		}
+	}
+
+	pthread_mutex_init (&switch_buf->switch_mutex, NULL);
+
+	// put it at the proper place
+	*((long *)xl->private) = (long)switch_buf; 
+
+	return 0;
+}
+
+static void
+switch_fini (xlator_t *xl)
+{
+	/* TODO: free all the allocated entries */
+	struct switch_struct *switch_buf = NULL;
+	switch_buf = (struct switch_struct *)*((long *)xl->private);
+
+	pthread_mutex_destroy (&switch_buf->switch_mutex);
+	free (switch_buf->array);
+	free (switch_buf);
+}
+
+static xlator_t *
+switch_schedule (xlator_t *xl, const void *path)
+{
+	struct switch_struct *switch_buf = NULL;
+	switch_buf = (struct switch_struct *)*((long *)xl->private);
+
+	return switch_get_matching_xl (path, switch_buf->cond);
+}
+
+
+/**
+ * notify
+ */
+void
+switch_notify (xlator_t *xl, int32_t event, void *data)
+{
+	/* TODO: This should be checking in switch_sched_struct */
+#if 0
+	struct switch_struct *switch_buf = NULL;
+	int32_t idx = 0;
+
+	switch_buf = (struct switch_struct *)*((long *)xl->private);
+	if (!switch_buf)
+		return;
+
+	for (idx = 0; idx < switch_buf->child_count; idx++) {
+		if (switch_buf->array[idx].xl == (xlator_t *)data)
+			break;
+	}
+
+	switch (event)
+	{
+	case GF_EVENT_CHILD_UP:
+	{
+		switch_buf->array[idx].eligible = 1;
+	}
+	break;
+	case GF_EVENT_CHILD_DOWN:
+	{
+		switch_buf->array[idx].eligible = 0;
+	}
+	break;
+	default:
+	{
+		;
+	}
+	break;
+	}
+#endif
+}
+
+static void 
+switch_update (xlator_t *xl)
+{
+	return;
+}
+
+struct sched_ops sched = {
+	.init     = switch_init,
+	.fini     = switch_fini,
+	.update   = switch_update,
+	.schedule = switch_schedule,
+	.notify   = switch_notify
+};
+
+struct volume_options options[] = {
+	{ .key   = { "scheduler.read-only-subvolumes" ,
+		     "switch.read-only-subvolumes"},  
+	  .type  = GF_OPTION_TYPE_ANY
+	},
+	{ .key   = { "scheduler.local-volume-name",
+		     "switch.nufa.local-volume-name" },
+	  .type  = GF_OPTION_TYPE_XLATOR
+	},
+	{ .key   = { "scheduler.switch.case",
+		     "switch.case" },
+	  .type  = GF_OPTION_TYPE_ANY
+	},
+	{ .key = {NULL} }
+};