X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=fs%2Fjfs%2Fjfs_metapage.h;h=d94f8d9e87d79daf92e639c791a3b81742eadb57;hb=2d29c6a075787f2c1bc49b86a084d2b878f72fc4;hp=0e58aba58c37c0e43bf3d743cac64778eeed75d5;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=~andy%2Flinux

diff --git a/fs/jfs/jfs_metapage.h b/fs/jfs/jfs_metapage.h
index 0e58aba58c3..d94f8d9e87d 100644
--- a/fs/jfs/jfs_metapage.h
+++ b/fs/jfs/jfs_metapage.h
@@ -1,19 +1,19 @@
 /*
- *   Copyright (c) International Business Machines Corp., 2000-2002
- *   Portions Copyright (c) Christoph Hellwig, 2001-2002
+ *   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 
+ *   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 
+ *   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
@@ -33,54 +33,54 @@ struct metapage {
 	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;
+	sector_t index;		/* block address of page */
 	wait_queue_head_t wait;
 
 	/* implementation */
 	struct page *page;
-	unsigned long logical_size;
+	unsigned int logical_size;
 
 	/* Journal management */
 	int clsn;
-	atomic_t nohomeok;
+	int 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 META_free	1
+#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)
+	 __get_metapage(inode, lblock, size, absolute, false)
 
 #define get_metapage(inode, lblock, size, absolute)\
-	 __get_metapage(inode, lblock, size, absolute, TRUE)
+	 __get_metapage(inode, lblock, size, absolute, true)
 
 extern void release_metapage(struct metapage *);
-extern void hold_metapage(struct metapage *, int);
+extern void grab_metapage(struct metapage *);
+extern void force_metapage(struct metapage *);
+
+/*
+ * hold_metapage and put_metapage are used in conjuction.  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)
 {
@@ -101,6 +101,46 @@ static inline void discard_metapage(struct metapage *mp)
 	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.
  */