cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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jfs_metapage.h (3619B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 *   Copyright (C) International Business Machines Corp., 2000-2002
      4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
      5 */
      6#ifndef	_H_JFS_METAPAGE
      7#define _H_JFS_METAPAGE
      8
      9#include <linux/pagemap.h>
     10
     11struct metapage {
     12	/* Common logsyncblk prefix (see jfs_logmgr.h) */
     13	u16 xflag;
     14	u16 unused;
     15	lid_t lid;
     16	int lsn;
     17	struct list_head synclist;
     18	/* End of logsyncblk prefix */
     19
     20	unsigned long flag;	/* See Below */
     21	unsigned long count;	/* Reference count */
     22	void *data;		/* Data pointer */
     23	sector_t index;		/* block address of page */
     24	wait_queue_head_t wait;
     25
     26	/* implementation */
     27	struct page *page;
     28	struct super_block *sb;
     29	unsigned int logical_size;
     30
     31	/* Journal management */
     32	int clsn;
     33	int nohomeok;
     34	struct jfs_log *log;
     35};
     36
     37/* metapage flag */
     38#define META_locked	0
     39#define META_dirty	2
     40#define META_sync	3
     41#define META_discard	4
     42#define META_forcewrite	5
     43#define META_io		6
     44
     45#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
     46
     47/* function prototypes */
     48extern int metapage_init(void);
     49extern void metapage_exit(void);
     50extern struct metapage *__get_metapage(struct inode *inode,
     51				  unsigned long lblock, unsigned int size,
     52				  int absolute, unsigned long new);
     53
     54#define read_metapage(inode, lblock, size, absolute)\
     55	 __get_metapage(inode, lblock, size, absolute, false)
     56
     57#define get_metapage(inode, lblock, size, absolute)\
     58	 __get_metapage(inode, lblock, size, absolute, true)
     59
     60extern void release_metapage(struct metapage *);
     61extern void grab_metapage(struct metapage *);
     62extern void force_metapage(struct metapage *);
     63
     64/*
     65 * hold_metapage and put_metapage are used in conjunction.  The page lock
     66 * is not dropped between the two, so no other threads can get or release
     67 * the metapage
     68 */
     69extern void hold_metapage(struct metapage *);
     70extern void put_metapage(struct metapage *);
     71
     72static inline void write_metapage(struct metapage *mp)
     73{
     74	set_bit(META_dirty, &mp->flag);
     75	release_metapage(mp);
     76}
     77
     78static inline void flush_metapage(struct metapage *mp)
     79{
     80	set_bit(META_sync, &mp->flag);
     81	write_metapage(mp);
     82}
     83
     84static inline void discard_metapage(struct metapage *mp)
     85{
     86	clear_bit(META_dirty, &mp->flag);
     87	set_bit(META_discard, &mp->flag);
     88	release_metapage(mp);
     89}
     90
     91static inline void metapage_nohomeok(struct metapage *mp)
     92{
     93	struct page *page = mp->page;
     94	lock_page(page);
     95	if (!mp->nohomeok++) {
     96		mark_metapage_dirty(mp);
     97		get_page(page);
     98		wait_on_page_writeback(page);
     99	}
    100	unlock_page(page);
    101}
    102
    103/*
    104 * This serializes access to mp->lsn when metapages are added to logsynclist
    105 * without setting nohomeok.  i.e. updating imap & dmap
    106 */
    107static inline void metapage_wait_for_io(struct metapage *mp)
    108{
    109	if (test_bit(META_io, &mp->flag))
    110		wait_on_page_writeback(mp->page);
    111}
    112
    113/*
    114 * This is called when already holding the metapage
    115 */
    116static inline void _metapage_homeok(struct metapage *mp)
    117{
    118	if (!--mp->nohomeok)
    119		put_page(mp->page);
    120}
    121
    122static inline void metapage_homeok(struct metapage *mp)
    123{
    124	hold_metapage(mp);
    125	_metapage_homeok(mp);
    126	put_metapage(mp);
    127}
    128
    129extern const struct address_space_operations jfs_metapage_aops;
    130
    131/*
    132 * This routines invalidate all pages for an extent.
    133 */
    134extern void __invalidate_metapages(struct inode *, s64, int);
    135#define invalidate_pxd_metapages(ip, pxd) \
    136	__invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
    137#define invalidate_dxd_metapages(ip, dxd) \
    138	__invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
    139#define invalidate_xad_metapages(ip, xad) \
    140	__invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
    141
    142#endif				/* _H_JFS_METAPAGE */