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authorIlya Yanok <yanok@emcraft.com>2008-11-13 19:49:35 +0300
committerWolfgang Denk <wd@denx.de>2008-12-09 23:39:59 +0100
commit9b7076229ec6a958bd835ab70745f7676297ce82 (patch)
treedaf8d517fffc53bbc0614337183e85d0210d0f29 /fs/jffs2/summary.h
parent70741004dc28946cd82c7af6789c4ddb3fc94526 (diff)
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jffs2: summary support
This patch adds support for reading fs information from summary node instead of scanning full eraseblock. Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Diffstat (limited to 'fs/jffs2/summary.h')
-rw-r--r--fs/jffs2/summary.h163
1 files changed, 163 insertions, 0 deletions
diff --git a/fs/jffs2/summary.h b/fs/jffs2/summary.h
new file mode 100644
index 0000000..834933c
--- /dev/null
+++ b/fs/jffs2/summary.h
@@ -0,0 +1,163 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
+ * Zoltan Sogor <weth@inf.u-szeged.hu>,
+ * Patrik Kluba <pajko@halom.u-szeged.hu>,
+ * University of Szeged, Hungary
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#ifndef JFFS2_SUMMARY_H
+#define JFFS2_SUMMARY_H
+
+#define BLK_STATE_ALLFF 0
+#define BLK_STATE_CLEAN 1
+#define BLK_STATE_PARTDIRTY 2
+#define BLK_STATE_CLEANMARKER 3
+#define BLK_STATE_ALLDIRTY 4
+#define BLK_STATE_BADBLOCK 5
+
+#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
+#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
+#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
+#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
+#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
+
+/* Summary structures used on flash */
+
+struct jffs2_sum_unknown_flash
+{
+ __u16 nodetype; /* node type */
+};
+
+struct jffs2_sum_inode_flash
+{
+ __u16 nodetype; /* node type */
+ __u32 inode; /* inode number */
+ __u32 version; /* inode version */
+ __u32 offset; /* offset on jeb */
+ __u32 totlen; /* record length */
+} __attribute__((packed));
+
+struct jffs2_sum_dirent_flash
+{
+ __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
+ __u32 totlen; /* record length */
+ __u32 offset; /* offset on jeb */
+ __u32 pino; /* parent inode */
+ __u32 version; /* dirent version */
+ __u32 ino; /* == zero for unlink */
+ uint8_t nsize; /* dirent name size */
+ uint8_t type; /* dirent type */
+ uint8_t name[0]; /* dirent name */
+} __attribute__((packed));
+
+struct jffs2_sum_xattr_flash
+{
+ __u16 nodetype; /* == JFFS2_NODETYPE_XATR */
+ __u32 xid; /* xattr identifier */
+ __u32 version; /* version number */
+ __u32 offset; /* offset on jeb */
+ __u32 totlen; /* node length */
+} __attribute__((packed));
+
+struct jffs2_sum_xref_flash
+{
+ __u16 nodetype; /* == JFFS2_NODETYPE_XREF */
+ __u32 offset; /* offset on jeb */
+} __attribute__((packed));
+
+union jffs2_sum_flash
+{
+ struct jffs2_sum_unknown_flash u;
+ struct jffs2_sum_inode_flash i;
+ struct jffs2_sum_dirent_flash d;
+ struct jffs2_sum_xattr_flash x;
+ struct jffs2_sum_xref_flash r;
+};
+
+/* Summary structures used in the memory */
+
+struct jffs2_sum_unknown_mem
+{
+ union jffs2_sum_mem *next;
+ __u16 nodetype; /* node type */
+};
+
+struct jffs2_sum_inode_mem
+{
+ union jffs2_sum_mem *next;
+ __u16 nodetype; /* node type */
+ __u32 inode; /* inode number */
+ __u32 version; /* inode version */
+ __u32 offset; /* offset on jeb */
+ __u32 totlen; /* record length */
+} __attribute__((packed));
+
+struct jffs2_sum_dirent_mem
+{
+ union jffs2_sum_mem *next;
+ __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
+ __u32 totlen; /* record length */
+ __u32 offset; /* ofset on jeb */
+ __u32 pino; /* parent inode */
+ __u32 version; /* dirent version */
+ __u32 ino; /* == zero for unlink */
+ uint8_t nsize; /* dirent name size */
+ uint8_t type; /* dirent type */
+ uint8_t name[0]; /* dirent name */
+} __attribute__((packed));
+
+struct jffs2_sum_xattr_mem
+{
+ union jffs2_sum_mem *next;
+ __u16 nodetype;
+ __u32 xid;
+ __u32 version;
+ __u32 offset;
+ __u32 totlen;
+} __attribute__((packed));
+
+struct jffs2_sum_xref_mem
+{
+ union jffs2_sum_mem *next;
+ __u16 nodetype;
+ __u32 offset;
+} __attribute__((packed));
+
+union jffs2_sum_mem
+{
+ struct jffs2_sum_unknown_mem u;
+ struct jffs2_sum_inode_mem i;
+ struct jffs2_sum_dirent_mem d;
+ struct jffs2_sum_xattr_mem x;
+ struct jffs2_sum_xref_mem r;
+};
+
+/* Summary related information stored in superblock */
+
+struct jffs2_summary
+{
+ uint32_t sum_size; /* collected summary information for nextblock */
+ uint32_t sum_num;
+ uint32_t sum_padded;
+ union jffs2_sum_mem *sum_list_head;
+ union jffs2_sum_mem *sum_list_tail;
+
+ __u32 *sum_buf; /* buffer for writing out summary */
+};
+
+/* Summary marker is stored at the end of every sumarized erase block */
+
+struct jffs2_sum_marker
+{
+ __u32 offset; /* offset of the summary node in the jeb */
+ __u32 magic; /* == JFFS2_SUM_MAGIC */
+};
+
+#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
+
+#endif /* JFFS2_SUMMARY_H */