| /* 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 page *page; |
| 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 page *page = mp->page; |
| lock_page(page); |
| if (!mp->nohomeok++) { |
| mark_metapage_dirty(mp); |
| get_page(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) |
| put_page(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 */ |