f5e54d6e53
Same as with already do with the file operations: keep them in .rodata and prevents people from doing runtime patching. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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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_free 1
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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 conjuction. 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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page_cache_get(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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page_cache_release(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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