1 files changed, 115 insertions, 0 deletions

diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h
new file mode 100644
index 000000000000..0e58aba58c37
--- /dev/null
+++ b/fs/jfs/jfs_metapage.h
@@ -0,0 +1,115 @@
+/*
+ *   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 */
+
+        /* list management stuff */
+        struct metapage *hash_prev;
+        struct metapage *hash_next;     /* Also used for free list */
+
+        /*
+         * mapping & index become redundant, but we need these here to
+         * add the metapage to the hash before we have the real page
+         */
+        struct address_space *mapping;
+        unsigned long index;
+        wait_queue_head_t wait;
+
+        /* implementation */
+        struct page *page;
+        unsigned long logical_size;
+
+        /* Journal management */
+        int clsn;
+        atomic_t nohomeok;
+        struct jfs_log *log;
+};
+
+/* metapage flag */
+#define META_locked     0
+#define META_absolute   1
+#define META_free       2
+#define META_dirty      3
+#define META_sync       4
+#define META_discard    5
+#define META_forced     6
+#define META_stale      7
+
+#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
+
+/* function prototypes */
+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 hold_metapage(struct metapage *, int);
+
+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);
+}
+
+/*
+ * 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 */