Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) International Business Machines Corp., 2000-2002 |
| 3 | * Portions Copyright (c) Christoph Hellwig, 2001-2002 |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 13 | * the GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #ifndef _H_JFS_METAPAGE |
| 20 | #define _H_JFS_METAPAGE |
| 21 | |
| 22 | #include <linux/pagemap.h> |
| 23 | |
| 24 | struct metapage { |
| 25 | /* Common logsyncblk prefix (see jfs_logmgr.h) */ |
| 26 | u16 xflag; |
| 27 | u16 unused; |
| 28 | lid_t lid; |
| 29 | int lsn; |
| 30 | struct list_head synclist; |
| 31 | /* End of logsyncblk prefix */ |
| 32 | |
| 33 | unsigned long flag; /* See Below */ |
| 34 | unsigned long count; /* Reference count */ |
| 35 | void *data; /* Data pointer */ |
| 36 | |
| 37 | /* list management stuff */ |
| 38 | struct metapage *hash_prev; |
| 39 | struct metapage *hash_next; /* Also used for free list */ |
| 40 | |
| 41 | /* |
| 42 | * mapping & index become redundant, but we need these here to |
| 43 | * add the metapage to the hash before we have the real page |
| 44 | */ |
| 45 | struct address_space *mapping; |
| 46 | unsigned long index; |
| 47 | wait_queue_head_t wait; |
| 48 | |
| 49 | /* implementation */ |
| 50 | struct page *page; |
| 51 | unsigned long logical_size; |
| 52 | |
| 53 | /* Journal management */ |
| 54 | int clsn; |
| 55 | atomic_t nohomeok; |
| 56 | struct jfs_log *log; |
| 57 | }; |
| 58 | |
| 59 | /* metapage flag */ |
| 60 | #define META_locked 0 |
| 61 | #define META_absolute 1 |
| 62 | #define META_free 2 |
| 63 | #define META_dirty 3 |
| 64 | #define META_sync 4 |
| 65 | #define META_discard 5 |
| 66 | #define META_forced 6 |
| 67 | #define META_stale 7 |
| 68 | |
| 69 | #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) |
| 70 | |
| 71 | /* function prototypes */ |
| 72 | extern struct metapage *__get_metapage(struct inode *inode, |
| 73 | unsigned long lblock, unsigned int size, |
| 74 | int absolute, unsigned long new); |
| 75 | |
| 76 | #define read_metapage(inode, lblock, size, absolute)\ |
| 77 | __get_metapage(inode, lblock, size, absolute, FALSE) |
| 78 | |
| 79 | #define get_metapage(inode, lblock, size, absolute)\ |
| 80 | __get_metapage(inode, lblock, size, absolute, TRUE) |
| 81 | |
| 82 | extern void release_metapage(struct metapage *); |
| 83 | extern void hold_metapage(struct metapage *, int); |
| 84 | |
| 85 | static inline void write_metapage(struct metapage *mp) |
| 86 | { |
| 87 | set_bit(META_dirty, &mp->flag); |
| 88 | release_metapage(mp); |
| 89 | } |
| 90 | |
| 91 | static inline void flush_metapage(struct metapage *mp) |
| 92 | { |
| 93 | set_bit(META_sync, &mp->flag); |
| 94 | write_metapage(mp); |
| 95 | } |
| 96 | |
| 97 | static inline void discard_metapage(struct metapage *mp) |
| 98 | { |
| 99 | clear_bit(META_dirty, &mp->flag); |
| 100 | set_bit(META_discard, &mp->flag); |
| 101 | release_metapage(mp); |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * This routines invalidate all pages for an extent. |
| 106 | */ |
| 107 | extern void __invalidate_metapages(struct inode *, s64, int); |
| 108 | #define invalidate_pxd_metapages(ip, pxd) \ |
| 109 | __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) |
| 110 | #define invalidate_dxd_metapages(ip, dxd) \ |
| 111 | __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) |
| 112 | #define invalidate_xad_metapages(ip, xad) \ |
| 113 | __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) |
| 114 | |
| 115 | #endif /* _H_JFS_METAPAGE */ |