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TOMOYO Linux Cross Reference
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         struct super_block *sb;
 42         unsigned int logical_size;
 43 
 44         /* Journal management */
 45         int clsn;
 46         int nohomeok;
 47         struct jfs_log *log;
 48 };
 49 
 50 /* metapage flag */
 51 #define META_locked     0
 52 #define META_dirty      2
 53 #define META_sync       3
 54 #define META_discard    4
 55 #define META_forcewrite 5
 56 #define META_io         6
 57 
 58 #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
 59 
 60 /* function prototypes */
 61 extern int metapage_init(void);
 62 extern void metapage_exit(void);
 63 extern struct metapage *__get_metapage(struct inode *inode,
 64                                   unsigned long lblock, unsigned int size,
 65                                   int absolute, unsigned long new);
 66 
 67 #define read_metapage(inode, lblock, size, absolute)\
 68          __get_metapage(inode, lblock, size, absolute, false)
 69 
 70 #define get_metapage(inode, lblock, size, absolute)\
 71          __get_metapage(inode, lblock, size, absolute, true)
 72 
 73 extern void release_metapage(struct metapage *);
 74 extern void grab_metapage(struct metapage *);
 75 extern void force_metapage(struct metapage *);
 76 
 77 /*
 78  * hold_metapage and put_metapage are used in conjunction.  The page lock
 79  * is not dropped between the two, so no other threads can get or release
 80  * the metapage
 81  */
 82 extern void hold_metapage(struct metapage *);
 83 extern void put_metapage(struct metapage *);
 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 static inline void metapage_nohomeok(struct metapage *mp)
105 {
106         struct page *page = mp->page;
107         lock_page(page);
108         if (!mp->nohomeok++) {
109                 mark_metapage_dirty(mp);
110                 get_page(page);
111                 wait_on_page_writeback(page);
112         }
113         unlock_page(page);
114 }
115 
116 /*
117  * This serializes access to mp->lsn when metapages are added to logsynclist
118  * without setting nohomeok.  i.e. updating imap & dmap
119  */
120 static inline void metapage_wait_for_io(struct metapage *mp)
121 {
122         if (test_bit(META_io, &mp->flag))
123                 wait_on_page_writeback(mp->page);
124 }
125 
126 /*
127  * This is called when already holding the metapage
128  */
129 static inline void _metapage_homeok(struct metapage *mp)
130 {
131         if (!--mp->nohomeok)
132                 put_page(mp->page);
133 }
134 
135 static inline void metapage_homeok(struct metapage *mp)
136 {
137         hold_metapage(mp);
138         _metapage_homeok(mp);
139         put_metapage(mp);
140 }
141 
142 extern const struct address_space_operations jfs_metapage_aops;
143 
144 /*
145  * This routines invalidate all pages for an extent.
146  */
147 extern void __invalidate_metapages(struct inode *, s64, int);
148 #define invalidate_pxd_metapages(ip, pxd) \
149         __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
150 #define invalidate_dxd_metapages(ip, dxd) \
151         __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
152 #define invalidate_xad_metapages(ip, xad) \
153         __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
154 
155 #endif                          /* _H_JFS_METAPAGE */
156 

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