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-rw-r--r--xlators/performance/io-cache/src/ioc-inode.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/xlators/performance/io-cache/src/ioc-inode.c b/xlators/performance/io-cache/src/ioc-inode.c
new file mode 100644
index 00000000000..2e2e561dd23
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+++ b/xlators/performance/io-cache/src/ioc-inode.c
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+/*
+ Copyright (c) 2007, 2008, 2009 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 "io-cache.h"
+
+
+/*
+ * str_to_ptr - convert a string to pointer
+ * @string: string
+ *
+ */
+void *
+str_to_ptr (char *string)
+{
+ void *ptr = (void *)strtoul (string, NULL, 16);
+ return ptr;
+}
+
+
+/*
+ * ptr_to_str - convert a pointer to string
+ * @ptr: pointer
+ *
+ */
+char *
+ptr_to_str (void *ptr)
+{
+ char *str;
+ asprintf (&str, "%p", ptr);
+ return str;
+}
+
+void
+ioc_inode_wakeup (call_frame_t *frame,
+ ioc_inode_t *ioc_inode,
+ struct stat *stbuf)
+{
+ ioc_waitq_t *waiter = NULL, *waited = NULL;
+ ioc_waitq_t *page_waitq = NULL;
+ int8_t cache_still_valid = 1;
+ ioc_local_t *local = frame->local;
+ int8_t need_fault = 0;
+ ioc_page_t *waiter_page = NULL;
+
+ ioc_inode_lock (ioc_inode);
+ {
+ waiter = ioc_inode->waitq;
+ ioc_inode->waitq = NULL;
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ if (stbuf)
+ cache_still_valid = ioc_cache_still_valid (ioc_inode, stbuf);
+ else
+ cache_still_valid = 0;
+
+ if (!waiter) {
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "cache validate called without any "
+ "page waiting to be validated");
+ }
+
+ while (waiter) {
+ waiter_page = waiter->data;
+ page_waitq = NULL;
+
+ if (waiter_page) {
+ if (cache_still_valid) {
+ /* cache valid, wake up page */
+ ioc_inode_lock (ioc_inode);
+ {
+ page_waitq =
+ ioc_page_wakeup (waiter_page);
+ }
+ ioc_inode_unlock (ioc_inode);
+ if (page_waitq)
+ ioc_waitq_return (page_waitq);
+ } else {
+ /* cache invalid, generate page fault and set
+ * page->ready = 0, to avoid double faults
+ */
+ ioc_inode_lock (ioc_inode);
+
+ if (waiter_page->ready) {
+ waiter_page->ready = 0;
+ need_fault = 1;
+ } else {
+ gf_log (frame->this->name,
+ GF_LOG_DEBUG,
+ "validate frame(%p) is waiting"
+ "for in-transit page = %p",
+ frame, waiter_page);
+ }
+
+ ioc_inode_unlock (ioc_inode);
+
+ if (need_fault) {
+ need_fault = 0;
+ ioc_page_fault (ioc_inode, frame,
+ local->fd,
+ waiter_page->offset);
+ }
+ }
+ }
+
+ waited = waiter;
+ waiter = waiter->next;
+
+ waited->data = NULL;
+ free (waited);
+ }
+}
+
+/*
+ * ioc_inode_update - create a new ioc_inode_t structure and add it to
+ * the table table. fill in the fields which are derived
+ * from inode_t corresponding to the file
+ *
+ * @table: io-table structure
+ * @inode: inode structure
+ *
+ * not for external reference
+ */
+ioc_inode_t *
+ioc_inode_update (ioc_table_t *table,
+ inode_t *inode,
+ uint32_t weight)
+{
+ ioc_inode_t *ioc_inode = CALLOC (1, sizeof (ioc_inode_t));
+ ERR_ABORT (ioc_inode);
+
+ ioc_inode->table = table;
+
+ /* initialize the list for pages */
+ INIT_LIST_HEAD (&ioc_inode->pages);
+ INIT_LIST_HEAD (&ioc_inode->page_lru);
+
+ ioc_table_lock (table);
+
+ table->inode_count++;
+ list_add (&ioc_inode->inode_list, &table->inodes);
+ list_add_tail (&ioc_inode->inode_lru, &table->inode_lru[weight]);
+
+ gf_log (table->xl->name,
+ GF_LOG_DEBUG,
+ "adding to inode_lru[%d]", weight);
+
+ ioc_table_unlock (table);
+
+ pthread_mutex_init (&ioc_inode->inode_lock, NULL);
+ ioc_inode->weight = weight;
+
+ return ioc_inode;
+}
+
+
+/*
+ * ioc_inode_destroy - destroy an ioc_inode_t object.
+ *
+ * @inode: inode to destroy
+ *
+ * to be called only from ioc_forget.
+ */
+void
+ioc_inode_destroy (ioc_inode_t *ioc_inode)
+{
+ ioc_table_t *table = ioc_inode->table;
+
+ ioc_table_lock (table);
+ table->inode_count--;
+ list_del (&ioc_inode->inode_list);
+ list_del (&ioc_inode->inode_lru);
+ ioc_table_unlock (table);
+
+ ioc_inode_flush (ioc_inode);
+
+ pthread_mutex_destroy (&ioc_inode->inode_lock);
+ free (ioc_inode);
+}
+