patch-2.4.20 linux-2.4.20/fs/jfs/jfs_metapage.h

• Lines: 118
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/jfs_metapage.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/jfs_metapage.h linux-2.4.20/fs/jfs/jfs_metapage.h
@@ -0,0 +1,117 @@
+/*
+ *   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 */
+
+	struct list_head inode_list;	/* per-inode metapage 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 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)))
+
+/*
+ * This one uses mp_list to invalidate all pages for an inode
+ */
+extern void invalidate_inode_metapages(struct inode *inode);
+#endif				/* _H_JFS_METAPAGE */