11a59d1b8SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */
21da177e4SLinus Torvalds /*
31868f4aaSDave Kleikamp * Copyright (C) International Business Machines Corp., 2000-2002
41868f4aaSDave Kleikamp * Portions Copyright (C) Christoph Hellwig, 2001-2002
51da177e4SLinus Torvalds */
61da177e4SLinus Torvalds #ifndef _H_JFS_METAPAGE
71da177e4SLinus Torvalds #define _H_JFS_METAPAGE
81da177e4SLinus Torvalds
91da177e4SLinus Torvalds #include <linux/pagemap.h>
101da177e4SLinus Torvalds
111da177e4SLinus Torvalds struct metapage {
121da177e4SLinus Torvalds /* Common logsyncblk prefix (see jfs_logmgr.h) */
131da177e4SLinus Torvalds u16 xflag;
141da177e4SLinus Torvalds u16 unused;
151da177e4SLinus Torvalds lid_t lid;
161da177e4SLinus Torvalds int lsn;
171da177e4SLinus Torvalds struct list_head synclist;
181da177e4SLinus Torvalds /* End of logsyncblk prefix */
191da177e4SLinus Torvalds
201da177e4SLinus Torvalds unsigned long flag; /* See Below */
211da177e4SLinus Torvalds unsigned long count; /* Reference count */
221da177e4SLinus Torvalds void *data; /* Data pointer */
237fab479bSDave Kleikamp sector_t index; /* block address of page */
241da177e4SLinus Torvalds wait_queue_head_t wait;
251da177e4SLinus Torvalds
261da177e4SLinus Torvalds /* implementation */
27*ad6c19e5SMatthew Wilcox (Oracle) struct folio *folio;
2811ab8319SDave Kleikamp struct super_block *sb;
297fab479bSDave Kleikamp unsigned int logical_size;
301da177e4SLinus Torvalds
311da177e4SLinus Torvalds /* Journal management */
321da177e4SLinus Torvalds int clsn;
337fab479bSDave Kleikamp int nohomeok;
341da177e4SLinus Torvalds struct jfs_log *log;
351da177e4SLinus Torvalds };
361da177e4SLinus Torvalds
371da177e4SLinus Torvalds /* metapage flag */
381da177e4SLinus Torvalds #define META_locked 0
397fab479bSDave Kleikamp #define META_dirty 2
407fab479bSDave Kleikamp #define META_sync 3
417fab479bSDave Kleikamp #define META_discard 4
427fab479bSDave Kleikamp #define META_forcewrite 5
437fab479bSDave Kleikamp #define META_io 6
441da177e4SLinus Torvalds
451da177e4SLinus Torvalds #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
461da177e4SLinus Torvalds
471da177e4SLinus Torvalds /* function prototypes */
481868f4aaSDave Kleikamp extern int metapage_init(void);
491868f4aaSDave Kleikamp extern void metapage_exit(void);
501da177e4SLinus Torvalds extern struct metapage *__get_metapage(struct inode *inode,
511da177e4SLinus Torvalds unsigned long lblock, unsigned int size,
521da177e4SLinus Torvalds int absolute, unsigned long new);
531da177e4SLinus Torvalds
541da177e4SLinus Torvalds #define read_metapage(inode, lblock, size, absolute)\
554d81715fSRichard Knutsson __get_metapage(inode, lblock, size, absolute, false)
561da177e4SLinus Torvalds
571da177e4SLinus Torvalds #define get_metapage(inode, lblock, size, absolute)\
584d81715fSRichard Knutsson __get_metapage(inode, lblock, size, absolute, true)
591da177e4SLinus Torvalds
601da177e4SLinus Torvalds extern void release_metapage(struct metapage *);
617fab479bSDave Kleikamp extern void grab_metapage(struct metapage *);
627fab479bSDave Kleikamp extern void force_metapage(struct metapage *);
637fab479bSDave Kleikamp
647fab479bSDave Kleikamp /*
6525985edcSLucas De Marchi * hold_metapage and put_metapage are used in conjunction. The page lock
667fab479bSDave Kleikamp * is not dropped between the two, so no other threads can get or release
677fab479bSDave Kleikamp * the metapage
687fab479bSDave Kleikamp */
697fab479bSDave Kleikamp extern void hold_metapage(struct metapage *);
707fab479bSDave Kleikamp extern void put_metapage(struct metapage *);
711da177e4SLinus Torvalds
write_metapage(struct metapage * mp)721da177e4SLinus Torvalds static inline void write_metapage(struct metapage *mp)
731da177e4SLinus Torvalds {
741da177e4SLinus Torvalds set_bit(META_dirty, &mp->flag);
751da177e4SLinus Torvalds release_metapage(mp);
761da177e4SLinus Torvalds }
771da177e4SLinus Torvalds
flush_metapage(struct metapage * mp)781da177e4SLinus Torvalds static inline void flush_metapage(struct metapage *mp)
791da177e4SLinus Torvalds {
801da177e4SLinus Torvalds set_bit(META_sync, &mp->flag);
811da177e4SLinus Torvalds write_metapage(mp);
821da177e4SLinus Torvalds }
831da177e4SLinus Torvalds
discard_metapage(struct metapage * mp)841da177e4SLinus Torvalds static inline void discard_metapage(struct metapage *mp)
851da177e4SLinus Torvalds {
861da177e4SLinus Torvalds clear_bit(META_dirty, &mp->flag);
871da177e4SLinus Torvalds set_bit(META_discard, &mp->flag);
881da177e4SLinus Torvalds release_metapage(mp);
891da177e4SLinus Torvalds }
901da177e4SLinus Torvalds
metapage_nohomeok(struct metapage * mp)917fab479bSDave Kleikamp static inline void metapage_nohomeok(struct metapage *mp)
927fab479bSDave Kleikamp {
93*ad6c19e5SMatthew Wilcox (Oracle) struct folio *folio = mp->folio;
94*ad6c19e5SMatthew Wilcox (Oracle) folio_lock(folio);
957fab479bSDave Kleikamp if (!mp->nohomeok++) {
967fab479bSDave Kleikamp mark_metapage_dirty(mp);
97*ad6c19e5SMatthew Wilcox (Oracle) folio_get(folio);
98*ad6c19e5SMatthew Wilcox (Oracle) folio_wait_writeback(folio);
997fab479bSDave Kleikamp }
100*ad6c19e5SMatthew Wilcox (Oracle) folio_unlock(folio);
1017fab479bSDave Kleikamp }
1027fab479bSDave Kleikamp
1037fab479bSDave Kleikamp /*
1047fab479bSDave Kleikamp * This serializes access to mp->lsn when metapages are added to logsynclist
1057fab479bSDave Kleikamp * without setting nohomeok. i.e. updating imap & dmap
1067fab479bSDave Kleikamp */
metapage_wait_for_io(struct metapage * mp)1077fab479bSDave Kleikamp static inline void metapage_wait_for_io(struct metapage *mp)
1087fab479bSDave Kleikamp {
1097fab479bSDave Kleikamp if (test_bit(META_io, &mp->flag))
110*ad6c19e5SMatthew Wilcox (Oracle) folio_wait_writeback(mp->folio);
1117fab479bSDave Kleikamp }
1127fab479bSDave Kleikamp
1137fab479bSDave Kleikamp /*
1147fab479bSDave Kleikamp * This is called when already holding the metapage
1157fab479bSDave Kleikamp */
_metapage_homeok(struct metapage * mp)1167fab479bSDave Kleikamp static inline void _metapage_homeok(struct metapage *mp)
1177fab479bSDave Kleikamp {
1187fab479bSDave Kleikamp if (!--mp->nohomeok)
119*ad6c19e5SMatthew Wilcox (Oracle) folio_put(mp->folio);
1207fab479bSDave Kleikamp }
1217fab479bSDave Kleikamp
metapage_homeok(struct metapage * mp)1227fab479bSDave Kleikamp static inline void metapage_homeok(struct metapage *mp)
1237fab479bSDave Kleikamp {
1247fab479bSDave Kleikamp hold_metapage(mp);
1257fab479bSDave Kleikamp _metapage_homeok(mp);
1267fab479bSDave Kleikamp put_metapage(mp);
1277fab479bSDave Kleikamp }
1287fab479bSDave Kleikamp
129f5e54d6eSChristoph Hellwig extern const struct address_space_operations jfs_metapage_aops;
1307fab479bSDave Kleikamp
1311da177e4SLinus Torvalds /*
1321da177e4SLinus Torvalds * This routines invalidate all pages for an extent.
1331da177e4SLinus Torvalds */
1341da177e4SLinus Torvalds extern void __invalidate_metapages(struct inode *, s64, int);
1351da177e4SLinus Torvalds #define invalidate_pxd_metapages(ip, pxd) \
1361da177e4SLinus Torvalds __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
1371da177e4SLinus Torvalds #define invalidate_dxd_metapages(ip, dxd) \
1381da177e4SLinus Torvalds __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
1391da177e4SLinus Torvalds #define invalidate_xad_metapages(ip, xad) \
1401da177e4SLinus Torvalds __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
1411da177e4SLinus Torvalds
1421da177e4SLinus Torvalds #endif /* _H_JFS_METAPAGE */
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