linux/fs/jfs/jfs_metapage.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *   Copyright (C) International Business Machines Corp., 2000-2002
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 */
#ifndef	_H_JFS_METAPAGE
#define _H_JFS_METAPAGE

#include <linux/pagemap.h>

struct metapage { … };

/* metapage flag */
#define META_locked …
#define META_dirty …
#define META_sync …
#define META_discard …
#define META_forcewrite …
#define META_io …

#define mark_metapage_dirty(mp) …

/* 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) …

#define get_metapage(inode, lblock, size, absolute) …

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 conjunction.  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)
{ … }

static inline void flush_metapage(struct metapage *mp)
{ … }

static inline void discard_metapage(struct metapage *mp)
{ … }

static inline void metapage_nohomeok(struct metapage *mp)
{ … }

/*
 * 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)
{ … }

/*
 * This is called when already holding the metapage
 */
static inline void _metapage_homeok(struct metapage *mp)
{ … }

static inline void metapage_homeok(struct 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) …
#define invalidate_dxd_metapages(ip, dxd) …
#define invalidate_xad_metapages(ip, xad) …

#endif				/* _H_JFS_METAPAGE */