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Linux/fs/jfs/jfs_metapage.h

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  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         sector_t index;         /* block address of page */
 37         wait_queue_head_t wait;
 38 
 39         /* implementation */
 40         struct page *page;
 41         unsigned int logical_size;
 42 
 43         /* Journal management */
 44         int clsn;
 45         int nohomeok;
 46         struct jfs_log *log;
 47 };
 48 
 49 /* metapage flag */
 50 #define META_locked     0
 51 #define META_dirty      2
 52 #define META_sync       3
 53 #define META_discard    4
 54 #define META_forcewrite 5
 55 #define META_io         6
 56 
 57 #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
 58 
 59 /* function prototypes */
 60 extern int metapage_init(void);
 61 extern void metapage_exit(void);
 62 extern struct metapage *__get_metapage(struct inode *inode,
 63                                   unsigned long lblock, unsigned int size,
 64                                   int absolute, unsigned long new);
 65 
 66 #define read_metapage(inode, lblock, size, absolute)\
 67          __get_metapage(inode, lblock, size, absolute, false)
 68 
 69 #define get_metapage(inode, lblock, size, absolute)\
 70          __get_metapage(inode, lblock, size, absolute, true)
 71 
 72 extern void release_metapage(struct metapage *);
 73 extern void grab_metapage(struct metapage *);
 74 extern void force_metapage(struct metapage *);
 75 
 76 /*
 77  * hold_metapage and put_metapage are used in conjunction.  The page lock
 78  * is not dropped between the two, so no other threads can get or release
 79  * the metapage
 80  */
 81 extern void hold_metapage(struct metapage *);
 82 extern void put_metapage(struct metapage *);
 83 
 84 static inline void write_metapage(struct metapage *mp)
 85 {
 86         set_bit(META_dirty, &mp->flag);
 87         release_metapage(mp);
 88 }
 89 
 90 static inline void flush_metapage(struct metapage *mp)
 91 {
 92         set_bit(META_sync, &mp->flag);
 93         write_metapage(mp);
 94 }
 95 
 96 static inline void discard_metapage(struct metapage *mp)
 97 {
 98         clear_bit(META_dirty, &mp->flag);
 99         set_bit(META_discard, &mp->flag);
100         release_metapage(mp);
101 }
102 
103 static inline void metapage_nohomeok(struct metapage *mp)
104 {
105         struct page *page = mp->page;
106         lock_page(page);
107         if (!mp->nohomeok++) {
108                 mark_metapage_dirty(mp);
109                 get_page(page);
110                 wait_on_page_writeback(page);
111         }
112         unlock_page(page);
113 }
114 
115 /*
116  * This serializes access to mp->lsn when metapages are added to logsynclist
117  * without setting nohomeok.  i.e. updating imap & dmap
118  */
119 static inline void metapage_wait_for_io(struct metapage *mp)
120 {
121         if (test_bit(META_io, &mp->flag))
122                 wait_on_page_writeback(mp->page);
123 }
124 
125 /*
126  * This is called when already holding the metapage
127  */
128 static inline void _metapage_homeok(struct metapage *mp)
129 {
130         if (!--mp->nohomeok)
131                 put_page(mp->page);
132 }
133 
134 static inline void metapage_homeok(struct metapage *mp)
135 {
136         hold_metapage(mp);
137         _metapage_homeok(mp);
138         put_metapage(mp);
139 }
140 
141 extern const struct address_space_operations jfs_metapage_aops;
142 
143 /*
144  * This routines invalidate all pages for an extent.
145  */
146 extern void __invalidate_metapages(struct inode *, s64, int);
147 #define invalidate_pxd_metapages(ip, pxd) \
148         __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
149 #define invalidate_dxd_metapages(ip, dxd) \
150         __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
151 #define invalidate_xad_metapages(ip, xad) \
152         __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
153 
154 #endif                          /* _H_JFS_METAPAGE */
155 

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