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Diffstat (limited to 'fs/jfs/jfs_metapage.h')
| -rw-r--r-- | fs/jfs/jfs_metapage.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h new file mode 100644 index 000000000..337e9e51a --- /dev/null +++ b/fs/jfs/jfs_metapage.h @@ -0,0 +1,154 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2002 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#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; + 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); + page_cache_get(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) + page_cache_release(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 */ |