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/*
Copyright (c) 2008-2012 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.
*/
#include "io-cache.h"
#include "ioc-mem-types.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;
GF_VALIDATE_OR_GOTO("io-cache", string, out);
ptr = (void *)strtoul(string, NULL, 16);
out:
return ptr;
}
/*
* ptr_to_str - convert a pointer to string
* @ptr: pointer
*
*/
char *
ptr_to_str(void *ptr)
{
int ret = 0;
char *str = NULL;
GF_VALIDATE_OR_GOTO("io-cache", ptr, out);
ret = gf_asprintf(&str, "%p", ptr);
if (-1 == ret) {
gf_smsg("io-cache", GF_LOG_WARNING, 0,
IO_CACHE_MSG_STR_COVERSION_FAILED, NULL);
str = NULL;
goto out;
}
out:
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;
GF_VALIDATE_OR_GOTO("io-cache", frame, out);
local = frame->local;
GF_VALIDATE_OR_GOTO(frame->this->name, local, out);
if (ioc_inode == NULL) {
local->op_ret = -1;
local->op_errno = EINVAL;
gf_smsg(frame->this->name, GF_LOG_WARNING, 0, IO_CACHE_MSG_INODE_NULL,
NULL);
goto out;
}
if (stbuf)
cache_still_valid = ioc_cache_still_valid(ioc_inode, stbuf);
else
cache_still_valid = 0;
ioc_inode_lock(ioc_inode);
{
waiter = ioc_inode->waitq;
if (!waiter) {
gf_smsg(frame->this->name, GF_LOG_WARNING, 0,
IO_CACHE_MSG_PAGE_WAIT_VALIDATE, NULL);
ioc_inode_unlock(ioc_inode);
goto out;
}
while (waiter) {
waiter_page = waiter->data;
ioc_inode->waitq = waiter->next;
page_waitq = NULL;
if (waiter_page) {
if (cache_still_valid) {
/* cache valid, wake up page */
page_waitq = __ioc_page_wakeup(waiter_page,
waiter_page->op_errno);
if (page_waitq) {
ioc_inode_unlock(ioc_inode);
ioc_waitq_return(page_waitq);
ioc_inode_lock(ioc_inode);
}
} else {
/* cache invalid, generate page fault and set
* page->ready = 0, to avoid double faults
*/
if (waiter_page->ready) {
waiter_page->ready = 0;
need_fault = 1;
} else {
gf_msg_trace(frame->this->name, 0,
"validate "
"frame(%p) is "
"waiting for "
"in-transit"
" page = %p",
frame, waiter_page);
}
if (need_fault) {
need_fault = 0;
ioc_inode_unlock(ioc_inode);
ioc_page_fault(ioc_inode, frame, local->fd,
waiter_page->offset);
ioc_inode_lock(ioc_inode);
}
}
}
waited = waiter;
waiter = ioc_inode->waitq;
waited->data = NULL;
GF_FREE(waited);
}
}
ioc_inode_unlock(ioc_inode);
out:
return;
}
/*
* ioc_inode_create - 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_create(ioc_table_t *table, inode_t *inode, uint32_t weight)
{
ioc_inode_t *ioc_inode = NULL;
GF_VALIDATE_OR_GOTO("io-cache", table, out);
ioc_inode = GF_CALLOC(1, sizeof(ioc_inode_t), gf_ioc_mt_ioc_inode_t);
if (ioc_inode == NULL) {
goto out;
}
ioc_inode->inode = inode;
ioc_inode->table = table;
INIT_LIST_HEAD(&ioc_inode->cache.page_lru);
pthread_mutex_init(&ioc_inode->inode_lock, NULL);
ioc_inode->weight = weight;
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]);
}
ioc_table_unlock(table);
gf_msg_trace(table->xl->name, 0, "adding to inode_lru[%d]", 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;
GF_VALIDATE_OR_GOTO("io-cache", ioc_inode, out);
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);
GF_FREE(ioc_inode);
out:
return;
}
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