156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*
|
|
* Copyright (C) International Business Machines Corp., 2000-2002
|
|
* Portions Copyright (C) Christoph Hellwig, 2001-2002
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#ifndef _H_JFS_METAPAGE
|
|
#define _H_JFS_METAPAGE
|
|
|
|
#include <linux/pagemap.h>
|
|
|
|
struct metapage {
|
|
/* Common logsyncblk prefix (see jfs_logmgr.h) */
|
|
u16 xflag;
|
|
u16 unused;
|
|
lid_t lid;
|
|
int lsn;
|
|
struct list_head synclist;
|
|
/* End of logsyncblk prefix */
|
|
|
|
unsigned long flag; /* See Below */
|
|
unsigned long count; /* Reference count */
|
|
void *data; /* Data pointer */
|
|
sector_t index; /* block address of page */
|
|
wait_queue_head_t wait;
|
|
|
|
/* implementation */
|
|
struct page *page;
|
|
unsigned int logical_size;
|
|
|
|
/* Journal management */
|
|
int clsn;
|
|
int nohomeok;
|
|
struct jfs_log *log;
|
|
};
|
|
|
|
/* metapage flag */
|
|
#define META_locked 0
|
|
#define META_free 1
|
|
#define META_dirty 2
|
|
#define META_sync 3
|
|
#define META_discard 4
|
|
#define META_forcewrite 5
|
|
#define META_io 6
|
|
|
|
#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
|
|
|
|
/* function prototypes */
|
|
extern int metapage_init(void);
|
|
extern void metapage_exit(void);
|
|
extern struct metapage *__get_metapage(struct inode *inode,
|
|
unsigned long lblock, unsigned int size,
|
|
int absolute, unsigned long new);
|
|
|
|
#define read_metapage(inode, lblock, size, absolute)\
|
|
__get_metapage(inode, lblock, size, absolute, false)
|
|
|
|
#define get_metapage(inode, lblock, size, absolute)\
|
|
__get_metapage(inode, lblock, size, absolute, true)
|
|
|
|
extern void release_metapage(struct metapage *);
|
|
extern void grab_metapage(struct metapage *);
|
|
extern void force_metapage(struct metapage *);
|
|
|
|
/*
|
|
* hold_metapage and put_metapage are used in conjuction. The page lock
|
|
* is not dropped between the two, so no other threads can get or release
|
|
* the metapage
|
|
*/
|
|
extern void hold_metapage(struct metapage *);
|
|
extern void put_metapage(struct metapage *);
|
|
|
|
static inline void write_metapage(struct metapage *mp)
|
|
{
|
|
set_bit(META_dirty, &mp->flag);
|
|
release_metapage(mp);
|
|
}
|
|
|
|
static inline void flush_metapage(struct metapage *mp)
|
|
{
|
|
set_bit(META_sync, &mp->flag);
|
|
write_metapage(mp);
|
|
}
|
|
|
|
static inline void discard_metapage(struct metapage *mp)
|
|
{
|
|
clear_bit(META_dirty, &mp->flag);
|
|
set_bit(META_discard, &mp->flag);
|
|
release_metapage(mp);
|
|
}
|
|
|
|
static inline void metapage_nohomeok(struct metapage *mp)
|
|
{
|
|
struct page *page = mp->page;
|
|
lock_page(page);
|
|
if (!mp->nohomeok++) {
|
|
mark_metapage_dirty(mp);
|
|
page_cache_get(page);
|
|
wait_on_page_writeback(page);
|
|
}
|
|
unlock_page(page);
|
|
}
|
|
|
|
/*
|
|
* This serializes access to mp->lsn when metapages are added to logsynclist
|
|
* without setting nohomeok. i.e. updating imap & dmap
|
|
*/
|
|
static inline void metapage_wait_for_io(struct metapage *mp)
|
|
{
|
|
if (test_bit(META_io, &mp->flag))
|
|
wait_on_page_writeback(mp->page);
|
|
}
|
|
|
|
/*
|
|
* This is called when already holding the metapage
|
|
*/
|
|
static inline void _metapage_homeok(struct metapage *mp)
|
|
{
|
|
if (!--mp->nohomeok)
|
|
page_cache_release(mp->page);
|
|
}
|
|
|
|
static inline void metapage_homeok(struct metapage *mp)
|
|
{
|
|
hold_metapage(mp);
|
|
_metapage_homeok(mp);
|
|
put_metapage(mp);
|
|
}
|
|
|
|
extern const struct address_space_operations jfs_metapage_aops;
|
|
|
|
/*
|
|
* This routines invalidate all pages for an extent.
|
|
*/
|
|
extern void __invalidate_metapages(struct inode *, s64, int);
|
|
#define invalidate_pxd_metapages(ip, pxd) \
|
|
__invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
|
|
#define invalidate_dxd_metapages(ip, dxd) \
|
|
__invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
|
|
#define invalidate_xad_metapages(ip, xad) \
|
|
__invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
|
|
|
|
#endif /* _H_JFS_METAPAGE */
|