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/*
Copyright (c) 2007-2009 Gluster, Inc. <http://www.gluster.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"
extern int ioc_log2_page_size;
/*
* str_to_ptr - convert a string to pointer
* @string: string
*
*/
void *
str_to_ptr (char *string)
{
void *ptr = NULL;
ptr = (void *)strtoul (string, NULL, 16);
return ptr;
}
/*
* ptr_to_str - convert a pointer to string
* @ptr: pointer
*
*/
char *
ptr_to_str (void *ptr)
{
int ret = 0;
char *str = NULL;
ret = asprintf (&str, "%p", ptr);
if (-1 == ret) {
gf_log ("ioc", GF_LOG_ERROR,
"asprintf failed while converting ptr to str");
return NULL;
}
return str;
}
void
ioc_inode_wakeup (call_frame_t *frame, ioc_inode_t *ioc_inode,
struct iatt *stbuf)
{
ioc_waitq_t *waiter = NULL, *waited = NULL;
ioc_waitq_t *page_waitq = NULL;
int8_t cache_still_valid = 1;
ioc_local_t *local = NULL;
int8_t need_fault = 0;
ioc_page_t *waiter_page = NULL;
local = frame->local;
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_TRACE,
"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 = NULL;
unsigned long no_of_pages = 0;
ioc_inode = CALLOC (1, sizeof (ioc_inode_t));
if (ioc_inode == NULL) {
goto out;
}
ioc_inode->table = table;
no_of_pages = (table->cache_size / table->page_size)
+ ((table->cache_size % table->page_size) ? 1 : 0);
INIT_LIST_HEAD (&ioc_inode->cache.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_TRACE,
"adding to inode_lru[%d]", weight);
ioc_table_unlock (table);
pthread_mutex_init (&ioc_inode->inode_lock, NULL);
ioc_inode->weight = weight;
out:
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 = NULL;
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);
rbthash_table_destroy (ioc_inode->cache.page_table);
pthread_mutex_destroy (&ioc_inode->inode_lock);
free (ioc_inode);
}
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