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142 lines
3.5 KiB
142 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2002 |
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* Portions Copyright (C) Christoph Hellwig, 2001-2002 |
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*/ |
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#ifndef _H_JFS_METAPAGE |
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#define _H_JFS_METAPAGE |
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#include <linux/pagemap.h> |
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struct metapage { |
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/* Common logsyncblk prefix (see jfs_logmgr.h) */ |
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u16 xflag; |
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u16 unused; |
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lid_t lid; |
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int lsn; |
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struct list_head synclist; |
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/* End of logsyncblk prefix */ |
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unsigned long flag; /* See Below */ |
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unsigned long count; /* Reference count */ |
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void *data; /* Data pointer */ |
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sector_t index; /* block address of page */ |
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wait_queue_head_t wait; |
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/* implementation */ |
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struct page *page; |
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struct super_block *sb; |
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unsigned int logical_size; |
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/* Journal management */ |
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int clsn; |
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int nohomeok; |
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struct jfs_log *log; |
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}; |
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/* metapage flag */ |
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#define META_locked 0 |
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#define META_dirty 2 |
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#define META_sync 3 |
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#define META_discard 4 |
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#define META_forcewrite 5 |
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#define META_io 6 |
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#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) |
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/* function prototypes */ |
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extern int metapage_init(void); |
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extern void metapage_exit(void); |
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extern struct metapage *__get_metapage(struct inode *inode, |
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unsigned long lblock, unsigned int size, |
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int absolute, unsigned long new); |
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#define read_metapage(inode, lblock, size, absolute)\ |
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__get_metapage(inode, lblock, size, absolute, false) |
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#define get_metapage(inode, lblock, size, absolute)\ |
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__get_metapage(inode, lblock, size, absolute, true) |
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extern void release_metapage(struct metapage *); |
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extern void grab_metapage(struct metapage *); |
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extern void force_metapage(struct metapage *); |
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/* |
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* hold_metapage and put_metapage are used in conjunction. The page lock |
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* is not dropped between the two, so no other threads can get or release |
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* the metapage |
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*/ |
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extern void hold_metapage(struct metapage *); |
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extern void put_metapage(struct metapage *); |
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static inline void write_metapage(struct metapage *mp) |
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{ |
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set_bit(META_dirty, &mp->flag); |
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release_metapage(mp); |
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} |
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static inline void flush_metapage(struct metapage *mp) |
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{ |
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set_bit(META_sync, &mp->flag); |
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write_metapage(mp); |
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} |
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static inline void discard_metapage(struct metapage *mp) |
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{ |
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clear_bit(META_dirty, &mp->flag); |
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set_bit(META_discard, &mp->flag); |
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release_metapage(mp); |
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} |
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static inline void metapage_nohomeok(struct metapage *mp) |
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{ |
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struct page *page = mp->page; |
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lock_page(page); |
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if (!mp->nohomeok++) { |
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mark_metapage_dirty(mp); |
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get_page(page); |
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wait_on_page_writeback(page); |
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} |
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unlock_page(page); |
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} |
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/* |
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* This serializes access to mp->lsn when metapages are added to logsynclist |
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* without setting nohomeok. i.e. updating imap & dmap |
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*/ |
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static inline void metapage_wait_for_io(struct metapage *mp) |
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{ |
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if (test_bit(META_io, &mp->flag)) |
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wait_on_page_writeback(mp->page); |
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} |
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/* |
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* This is called when already holding the metapage |
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*/ |
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static inline void _metapage_homeok(struct metapage *mp) |
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{ |
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if (!--mp->nohomeok) |
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put_page(mp->page); |
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} |
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static inline void metapage_homeok(struct metapage *mp) |
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{ |
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hold_metapage(mp); |
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_metapage_homeok(mp); |
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put_metapage(mp); |
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} |
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extern const struct address_space_operations jfs_metapage_aops; |
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/* |
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* This routines invalidate all pages for an extent. |
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*/ |
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extern void __invalidate_metapages(struct inode *, s64, int); |
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#define invalidate_pxd_metapages(ip, pxd) \ |
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__invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) |
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#define invalidate_dxd_metapages(ip, dxd) \ |
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__invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) |
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#define invalidate_xad_metapages(ip, xad) \ |
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__invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) |
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#endif /* _H_JFS_METAPAGE */
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