fs/jffs2/summary.h

Source file repositories/reference/linux-study-clean/fs/jffs2/summary.h

File Facts

System
Linux kernel
Corpus path
fs/jffs2/summary.h
Extension
.h
Size
6594 bytes
Lines
214
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#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[];	/* 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 */

Annotation

Implementation Notes