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/*
Copyright (c) 2007-2009 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 __IO_CACHE_H
#define __IO_CACHE_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include "compat-errno.h"
#include "glusterfs.h"
#include "logging.h"
#include "dict.h"
#include "xlator.h"
#include "common-utils.h"
#include "call-stub.h"
#include <sys/time.h>
#include <fnmatch.h>
#define IOC_PAGE_SIZE (1024 * 128) /* 128KB */
#define IOC_CACHE_SIZE (32 * 1024 * 1024)
struct ioc_table;
struct ioc_local;
struct ioc_page;
struct ioc_inode;
struct ioc_priority {
struct list_head list;
char *pattern;
uint32_t priority;
};
/*
* ioc_waitq - this structure is used to represents the waiting
* frames on a page
*
* @next: pointer to next object in waitq
* @data: pointer to the frame which is waiting
*/
struct ioc_waitq {
struct ioc_waitq *next;
void *data;
off_t pending_offset;
size_t pending_size;
};
/*
* ioc_fill -
*
*/
struct ioc_fill {
struct list_head list; /* list of ioc_fill structures of a frame */
off_t offset;
size_t size;
struct iovec *vector;
int32_t count;
struct iobref *iobref;
};
struct ioc_local {
mode_t mode;
int32_t flags;
loc_t file_loc;
off_t offset;
size_t size;
int32_t op_ret;
int32_t op_errno;
struct list_head fill_list; /* list of ioc_fill structures */
off_t pending_offset; /*
* offset from this frame should
* continue
*/
size_t pending_size; /*
* size of data this frame is waiting
* on
*/
struct ioc_inode *inode;
int32_t wait_count;
pthread_mutex_t local_lock;
struct ioc_waitq *waitq;
void *stub;
fd_t *fd;
int32_t need_xattr;
dict_t *xattr_req;
};
/*
* ioc_page - structure to store page of data from file
*
*/
struct ioc_page {
struct list_head pages;
struct list_head page_lru;
struct ioc_inode *inode; /* inode this page belongs to */
struct ioc_priority *priority;
char dirty;
char ready;
struct iovec *vector;
int32_t count;
off_t offset;
size_t size;
struct ioc_waitq *waitq;
struct iobref *iobref;
pthread_mutex_t page_lock;
};
struct ioc_inode {
struct ioc_table *table;
struct list_head pages; /* list of pages of this inode */
struct list_head inode_list; /*
* list of inodes, maintained by io-cache
* translator
*/
struct list_head inode_lru;
struct list_head page_lru;
struct ioc_waitq *waitq;
pthread_mutex_t inode_lock;
uint32_t weight; /*
* weight of the inode, increases on each
* read
*/
time_t mtime; /*
* mtime of the server file when last
* cached
*/
struct timeval tv; /*
* time-stamp at last re-validate
*/
};
struct ioc_table {
uint64_t page_size;
uint64_t cache_size;
uint64_t cache_used;
struct list_head inodes; /* list of inodes cached */
struct list_head active;
struct list_head *inode_lru;
struct list_head priority_list;
int32_t readv_count;
pthread_mutex_t table_lock;
xlator_t *xl;
uint32_t inode_count;
int32_t cache_timeout;
int32_t max_pri;
};
typedef struct ioc_table ioc_table_t;
typedef struct ioc_local ioc_local_t;
typedef struct ioc_page ioc_page_t;
typedef struct ioc_inode ioc_inode_t;
typedef struct ioc_waitq ioc_waitq_t;
typedef struct ioc_fill ioc_fill_t;
void *
str_to_ptr (char *string);
char *
ptr_to_str (void *ptr);
int32_t
ioc_readv_disabled_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, struct iovec *vector,
int32_t count, struct stat *stbuf,
struct iobref *iobref);
ioc_page_t *
ioc_page_get (ioc_inode_t *ioc_inode, off_t offset);
ioc_page_t *
ioc_page_create (ioc_inode_t *ioc_inode, off_t offset);
void
ioc_page_fault (ioc_inode_t *ioc_inode, call_frame_t *frame, fd_t *fd,
off_t offset);
void
ioc_wait_on_page (ioc_page_t *page, call_frame_t *frame, off_t offset,
size_t size);
ioc_waitq_t *
ioc_page_wakeup (ioc_page_t *page);
void
ioc_page_flush (ioc_page_t *page);
ioc_waitq_t *
ioc_page_error (ioc_page_t *page, int32_t op_ret, int32_t op_errno);
void
ioc_page_purge (ioc_page_t *page);
void
ioc_frame_return (call_frame_t *frame);
void
ioc_waitq_return (ioc_waitq_t *waitq);
void
ioc_frame_fill (ioc_page_t *page, call_frame_t *frame, off_t offset,
size_t size);
#define ioc_inode_lock(ioc_inode) \
do { \
gf_log (ioc_inode->table->xl->name, GF_LOG_TRACE, \
"locked inode(%p)", ioc_inode); \
pthread_mutex_lock (&ioc_inode->inode_lock); \
} while (0)
#define ioc_inode_unlock(ioc_inode) \
do { \
gf_log (ioc_inode->table->xl->name, GF_LOG_TRACE, \
"unlocked inode(%p)", ioc_inode); \
pthread_mutex_unlock (&ioc_inode->inode_lock); \
} while (0)
#define ioc_table_lock(table) \
do { \
gf_log (table->xl->name, GF_LOG_TRACE, \
"locked table(%p)", table); \
pthread_mutex_lock (&table->table_lock); \
} while (0)
#define ioc_table_unlock(table) \
do { \
gf_log (table->xl->name, GF_LOG_TRACE, \
"unlocked table(%p)", table); \
pthread_mutex_unlock (&table->table_lock); \
} while (0)
#define ioc_local_lock(local) \
do { \
gf_log (local->inode->table->xl->name, GF_LOG_TRACE, \
"locked local(%p)", local); \
pthread_mutex_lock (&local->local_lock); \
} while (0)
#define ioc_local_unlock(local) \
do { \
gf_log (local->inode->table->xl->name, GF_LOG_TRACE, \
"unlocked local(%p)", local); \
pthread_mutex_unlock (&local->local_lock); \
} while (0)
#define ioc_page_lock(page) \
do { \
gf_log (page->inode->table->xl->name, GF_LOG_TRACE, \
"locked page(%p)", page); \
pthread_mutex_lock (&page->page_lock); \
} while (0)
#define ioc_page_unlock(page) \
do { \
gf_log (page->inode->table->xl->name, GF_LOG_TRACE, \
"unlocked page(%p)", page); \
pthread_mutex_unlock (&page->page_lock); \
} while (0)
static inline uint64_t
time_elapsed (struct timeval *now,
struct timeval *then)
{
uint64_t sec = now->tv_sec - then->tv_sec;
if (sec)
return sec;
return 0;
}
ioc_inode_t *
ioc_inode_search (ioc_table_t *table, inode_t *inode);
void
ioc_inode_destroy (ioc_inode_t *ioc_inode);
ioc_inode_t *
ioc_inode_update (ioc_table_t *table, inode_t *inode, uint32_t weight);
int64_t
ioc_page_destroy (ioc_page_t *page);
int32_t
__ioc_inode_flush (ioc_inode_t *ioc_inode);
void
ioc_inode_flush (ioc_inode_t *ioc_inode);
void
ioc_inode_wakeup (call_frame_t *frame, ioc_inode_t *ioc_inode,
struct stat *stbuf);
int8_t
ioc_cache_still_valid (ioc_inode_t *ioc_inode, struct stat *stbuf);
int32_t
ioc_prune (ioc_table_t *table);
int32_t
ioc_need_prune (ioc_table_t *table);
#endif /* __IO_CACHE_H */
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