patch-2.4.0-test3 linux/fs/jffs/jffs_fm.h

• Lines: 125
• Date: Wed Jul 5 18:08:26 2000
• Orig file: v2.4.0-test2/linux/fs/jffs/jffs_fm.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/fs/jffs/jffs_fm.h linux/fs/jffs/jffs_fm.h
@@ -0,0 +1,124 @@
+/*
+ * JFFS -- Journaling Flash File System, Linux implementation.
+ *
+ * Copyright (C) 1999, 2000  Axis Communications AB.
+ *
+ * Created by Finn Hakansson <finn@axis.com>.
+ *
+ * This 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.
+ *
+ * $Id: jffs_fm.h,v 1.3 2000/07/04 16:15:42 dwmw2 Exp $
+ *
+ * Ported to Linux 2.3.x and MTD:
+ * Copyright (C) 2000  Alexander Larsson (alex@cendio.se), Cendio Systems AB
+ *
+ */
+
+#ifndef __LINUX_JFFS_FM_H__
+#define __LINUX_JFFS_FM_H__
+
+#include <linux/types.h>
+#include <linux/jffs.h>
+#include <linux/mtd/mtd.h>
+
+/* The alignment between two nodes in the flash memory.  */
+#define JFFS_ALIGN_SIZE 4
+
+/* Mark the on-flash space as obsolete when appropriate.  */
+#define JFFS_MARK_OBSOLETE 0
+
+#define CONFIG_JFFS_FS_VERBOSE 0
+
+/* How many padding bytes should be inserted between two chunks of data
+   on the flash?  */
+#define JFFS_GET_PAD_BYTES(size) ((JFFS_ALIGN_SIZE                     \
+				  - ((__u32)(size) % JFFS_ALIGN_SIZE)) \
+				  % JFFS_ALIGN_SIZE)
+
+/* Is there enough space on the flash?  */
+#define JFFS_ENOUGH_SPACE(fmc) (((fmc)->flash_size - (fmc)->used_size \
+				 - (fmc)->dirty_size) >= (fmc)->min_free_size)
+
+
+struct jffs_node_ref
+{
+	struct jffs_node *node;
+	struct jffs_node_ref *next;
+};
+
+
+/* The struct jffs_fm represents a chunk of data in the flash memory.  */
+struct jffs_fm
+{
+	__u32 offset;
+	__u32 size;
+	struct jffs_fm *prev;
+	struct jffs_fm *next;
+	struct jffs_node_ref *nodes; /* USED if != 0.  */
+};
+
+struct jffs_fmcontrol
+{
+	__u32 flash_start;
+	__u32 flash_size;
+	__u32 used_size;
+	__u32 dirty_size;
+	__u32 sector_size;
+	__u32 min_free_size;  /* The minimum free space needed to be able
+				 to perform garbage collections.  */
+	__u32 max_chunk_size; /* The maximum size of a chunk of data.  */
+	struct mtd_info *mtd;
+	__u32 no_call_gc;
+	struct jffs_control *c;
+	struct jffs_fm *head;
+	struct jffs_fm *tail;
+	struct jffs_fm *head_extra;
+	struct jffs_fm *tail_extra;
+};
+
+/* Notice the two members head_extra and tail_extra in the jffs_control
+   structure above. Those are only used during the scanning of the flash
+   memory; while the file system is being built. If the data in the flash
+   memory is organized like
+
+      +----------------+------------------+----------------+
+      |  USED / DIRTY  |       FREE       |  USED / DIRTY  |
+      +----------------+------------------+----------------+
+
+   then the scan is split in two parts. The first scanned part of the
+   flash memory is organized through the members head and tail. The
+   second scanned part is organized with head_extra and tail_extra. When
+   the scan is completed, the two lists are merged together. The jffs_fm
+   struct that head_extra references is the logical beginning of the
+   flash memory so it will be referenced by the head member.  */
+
+
+struct jffs_fmcontrol *jffs_build_begin(struct jffs_control *c, kdev_t dev);
+void jffs_build_end(struct jffs_fmcontrol *fmc);
+void jffs_cleanup_fmcontrol(struct jffs_fmcontrol *fmc);
+
+int jffs_fmalloc(struct jffs_fmcontrol *fmc, __u32 size,
+		 struct jffs_node *node, struct jffs_fm **result);
+int jffs_fmfree(struct jffs_fmcontrol *fmc, struct jffs_fm *fm,
+		struct jffs_node *node);
+
+__u32 jffs_free_size1(struct jffs_fmcontrol *fmc);
+__u32 jffs_free_size2(struct jffs_fmcontrol *fmc);
+void jffs_sync_erase(struct jffs_fmcontrol *fmc, int erased_size);
+struct jffs_fm *jffs_cut_node(struct jffs_fmcontrol *fmc, __u32 size);
+struct jffs_node *jffs_get_oldest_node(struct jffs_fmcontrol *fmc);
+long jffs_erasable_size(struct jffs_fmcontrol *fmc);
+struct jffs_fm *jffs_fmalloced(struct jffs_fmcontrol *fmc, __u32 offset,
+			       __u32 size, struct jffs_node *node);
+int jffs_add_node(struct jffs_node *node);
+void jffs_fmfree_partly(struct jffs_fmcontrol *fmc, struct jffs_fm *fm,
+			__u32 size);
+
+void jffs_print_fmcontrol(struct jffs_fmcontrol *fmc);
+void jffs_print_fm(struct jffs_fm *fm);
+void jffs_print_node_ref(struct jffs_node_ref *ref);
+
+#endif /* __LINUX_JFFS_FM_H__  */