| 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 | |
| 11 | struct 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 */ |
| 48 | extern int metapage_init(void); |
| 49 | extern void metapage_exit(void); |
| 50 | extern 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 | |
| 60 | extern void release_metapage(struct metapage *); |
| 61 | extern void grab_metapage(struct metapage *); |
| 62 | extern 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 | */ |
| 69 | extern void hold_metapage(struct metapage *); |
| 70 | extern void put_metapage(struct metapage *); |
| 71 | |
| 72 | static inline void write_metapage(struct metapage *mp) |
| 73 | { |
| 74 | set_bit(META_dirty, &mp->flag); |
| 75 | release_metapage(mp); |
| 76 | } |
| 77 | |
| 78 | static inline void flush_metapage(struct metapage *mp) |
| 79 | { |
| 80 | set_bit(META_sync, &mp->flag); |
| 81 | write_metapage(mp); |
| 82 | } |
| 83 | |
| 84 | static 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 | |
| 91 | static 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 | */ |
| 107 | static 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 | */ |
| 116 | static inline void _metapage_homeok(struct metapage *mp) |
| 117 | { |
| 118 | if (!--mp->nohomeok) |
| 119 | put_page(mp->page); |
| 120 | } |
| 121 | |
| 122 | static inline void metapage_homeok(struct metapage *mp) |
| 123 | { |
| 124 | hold_metapage(mp); |
| 125 | _metapage_homeok(mp); |
| 126 | put_metapage(mp); |
| 127 | } |
| 128 | |
| 129 | extern const struct address_space_operations jfs_metapage_aops; |
| 130 | |
| 131 | /* |
| 132 | * This routines invalidate all pages for an extent. |
| 133 | */ |
| 134 | extern 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 */ |