--- /dev/null
+/*
+ * 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
+
+/* Limit summary size to 64KiB so that we can kmalloc it. If the summary
+ is larger than that, we have to just ditch it and avoid using summary
+ for the eraseblock in question... and it probably doesn't hurt us much
+ anyway. */
+#define MAX_SUMMARY_SIZE 65536
+
+#include <linux/uio.h>
+#include <linux/jffs2.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
+{
+ jint16_t nodetype; /* node type */
+};
+
+struct jffs2_sum_inode_flash
+{
+ jint16_t nodetype; /* node type */
+ jint32_t inode; /* inode number */
+ jint32_t version; /* inode version */
+ jint32_t offset; /* offset on jeb */
+ jint32_t totlen; /* record length */
+} __attribute__((packed));
+
+struct jffs2_sum_dirent_flash
+{
+ jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
+ jint32_t totlen; /* record length */
+ jint32_t offset; /* offset on jeb */
+ jint32_t pino; /* parent inode */
+ jint32_t version; /* dirent version */
+ jint32_t 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
+{
+ jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */
+ jint32_t xid; /* xattr identifier */
+ jint32_t version; /* version number */
+ jint32_t offset; /* offset on jeb */
+ jint32_t totlen; /* node length */
+} __attribute__((packed));
+
+struct jffs2_sum_xref_flash
+{
+ jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */
+ jint32_t 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;
+ jint16_t nodetype; /* node type */
+};
+
+struct jffs2_sum_inode_mem
+{
+ union jffs2_sum_mem *next;
+ jint16_t nodetype; /* node type */
+ jint32_t inode; /* inode number */
+ jint32_t version; /* inode version */
+ jint32_t offset; /* offset on jeb */
+ jint32_t totlen; /* record length */
+} __attribute__((packed));
+
+struct jffs2_sum_dirent_mem
+{
+ union jffs2_sum_mem *next;
+ jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
+ jint32_t totlen; /* record length */
+ jint32_t offset; /* ofset on jeb */
+ jint32_t pino; /* parent inode */
+ jint32_t version; /* dirent version */
+ jint32_t 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;
+ jint16_t nodetype;
+ jint32_t xid;
+ jint32_t version;
+ jint32_t offset;
+ jint32_t totlen;
+} __attribute__((packed));
+
+struct jffs2_sum_xref_mem
+{
+ union jffs2_sum_mem *next;
+ jint16_t nodetype;
+ jint32_t 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;
+
+ jint32_t *sum_buf; /* buffer for writing out summary */
+};
+
+/* Summary marker is stored at the end of every sumarized erase block */
+
+struct jffs2_sum_marker
+{
+ jint32_t offset; /* offset of the summary node in the jeb */
+ jint32_t magic; /* == JFFS2_SUM_MAGIC */
+};
+
+#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
+
+#ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */
+
+#define jffs2_sum_active() (1)
+int jffs2_sum_init(struct jffs2_sb_info *c);
+void jffs2_sum_exit(struct jffs2_sb_info *c);
+void jffs2_sum_disable_collecting(struct jffs2_summary *s);
+int jffs2_sum_is_disabled(struct jffs2_summary *s);
+void jffs2_sum_reset_collected(struct jffs2_summary *s);
+void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
+int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
+ unsigned long count, uint32_t to);
+int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
+int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
+int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
+int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
+int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs);
+int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs);
+int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
+ struct jffs2_raw_summary *summary, uint32_t sumlen,
+ uint32_t *pseudo_random);
+
+#else /* SUMMARY DISABLED */
+
+#define jffs2_sum_active() (0)
+#define jffs2_sum_init(a) (0)
+#define jffs2_sum_exit(a)
+#define jffs2_sum_disable_collecting(a)
+#define jffs2_sum_is_disabled(a) (0)
+#define jffs2_sum_reset_collected(a)
+#define jffs2_sum_add_kvec(a,b,c,d) (0)
+#define jffs2_sum_move_collected(a,b)
+#define jffs2_sum_write_sumnode(a) (0)
+#define jffs2_sum_add_padding_mem(a,b)
+#define jffs2_sum_add_inode_mem(a,b,c)
+#define jffs2_sum_add_dirent_mem(a,b,c)
+#define jffs2_sum_add_xattr_mem(a,b,c)
+#define jffs2_sum_add_xref_mem(a,b,c)
+#define jffs2_sum_scan_sumnode(a,b,c,d,e) (0)
+
+#endif /* CONFIG_JFFS2_SUMMARY */
+
+#endif /* JFFS2_SUMMARY_H */
Code Review / kvmfornfv.git / blobdiff