mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 14:11:52 +00:00
ad6c19e5f9
Convert all the users to operate on a folio. Saves sixteen calls to compound_head(). We still use sizeof(struct page) in print_hex_dump, otherwise it will go into the second and third pages of the folio which won't exist for jfs folios (since they are not large). This needs a better solution, but finding it can be postponed. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/* 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 {
|
|
/* 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 folio *folio;
|
|
struct super_block *sb;
|
|
unsigned int logical_size;
|
|
|
|
/* Journal management */
|
|
int clsn;
|
|
int nohomeok;
|
|
struct jfs_log *log;
|
|
};
|
|
|
|
/* metapage flag */
|
|
#define META_locked 0
|
|
#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 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)
|
|
{
|
|
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 folio *folio = mp->folio;
|
|
folio_lock(folio);
|
|
if (!mp->nohomeok++) {
|
|
mark_metapage_dirty(mp);
|
|
folio_get(folio);
|
|
folio_wait_writeback(folio);
|
|
}
|
|
folio_unlock(folio);
|
|
}
|
|
|
|
/*
|
|
* 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))
|
|
folio_wait_writeback(mp->folio);
|
|
}
|
|
|
|
/*
|
|
* This is called when already holding the metapage
|
|
*/
|
|
static inline void _metapage_homeok(struct metapage *mp)
|
|
{
|
|
if (!--mp->nohomeok)
|
|
folio_put(mp->folio);
|
|
}
|
|
|
|
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 */
|