patch-2.3.43 linux/include/linux/md.h

• Lines: 301
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.42/linux/include/linux/md.h
• Orig date: Tue May 11 14:46:24 1999

diff -u --recursive --new-file v2.3.42/linux/include/linux/md.h linux/include/linux/md.h
@@ -1,300 +0,0 @@
-/*
-   md.h : Multiple Devices driver for Linux
-          Copyright (C) 1994-96 Marc ZYNGIER
-	  <zyngier@ufr-info-p7.ibp.fr> or
-	  <maz@gloups.fdn.fr>
-	  
-   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, or (at your option)
-   any later version.
-   
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
-*/
-
-#ifndef _MD_H
-#define _MD_H
-
-#include <linux/major.h>
-#include <linux/ioctl.h>
-#include <linux/types.h>
-
-/*
- * Different major versions are not compatible.
- * Different minor versions are only downward compatible.
- * Different patchlevel versions are downward and upward compatible.
- */
-#define MD_MAJOR_VERSION		0
-#define MD_MINOR_VERSION		36
-#define MD_PATCHLEVEL_VERSION		6
-
-#define MD_DEFAULT_DISK_READAHEAD	(256 * 1024)
-
-/* ioctls */
-#define REGISTER_DEV 		_IO (MD_MAJOR, 1)
-#define START_MD     		_IO (MD_MAJOR, 2)
-#define STOP_MD      		_IO (MD_MAJOR, 3)
-#define REGISTER_DEV_NEW	_IO (MD_MAJOR, 4)
-
-/*
-   personalities :
-   Byte 0 : Chunk size factor
-   Byte 1 : Fault tolerance count for each physical device
-            (   0 means no fault tolerance,
-             0xFF means always tolerate faults), not used by now.
-   Byte 2 : Personality
-   Byte 3 : Reserved.
- */
-
-#define FAULT_SHIFT       8
-#define PERSONALITY_SHIFT 16
-
-#define FACTOR_MASK       0x000000FFUL
-#define FAULT_MASK        0x0000FF00UL
-#define PERSONALITY_MASK  0x00FF0000UL
-
-#define MD_RESERVED       0	/* Not used by now */
-#define LINEAR            (1UL << PERSONALITY_SHIFT)
-#define STRIPED           (2UL << PERSONALITY_SHIFT)
-#define RAID0             STRIPED
-#define RAID1             (3UL << PERSONALITY_SHIFT)
-#define RAID5             (4UL << PERSONALITY_SHIFT)
-#define MAX_PERSONALITY   5
-
-/*
- * MD superblock.
- *
- * The MD superblock maintains some statistics on each MD configuration.
- * Each real device in the MD set contains it near the end of the device.
- * Some of the ideas are copied from the ext2fs implementation.
- *
- * We currently use 4096 bytes as follows:
- *
- *	word offset	function
- *
- *	   0  -    31	Constant generic MD device information.
- *        32  -    63   Generic state information.
- *	  64  -   127	Personality specific information.
- *	 128  -   511	12 32-words descriptors of the disks in the raid set.
- *	 512  -   911	Reserved.
- *	 912  -  1023	Disk specific descriptor.
- */
-
-/*
- * If x is the real device size in bytes, we return an apparent size of:
- *
- *	y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
- *
- * and place the 4kB superblock at offset y.
- */
-#define MD_RESERVED_BYTES		(64 * 1024)
-#define MD_RESERVED_SECTORS		(MD_RESERVED_BYTES / 512)
-#define MD_RESERVED_BLOCKS		(MD_RESERVED_BYTES / BLOCK_SIZE)
-
-#define MD_NEW_SIZE_SECTORS(x)		((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
-#define MD_NEW_SIZE_BLOCKS(x)		((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
-
-#define MD_SB_BYTES			4096
-#define MD_SB_WORDS			(MD_SB_BYTES / 4)
-#define MD_SB_BLOCKS			(MD_SB_BYTES / BLOCK_SIZE)
-#define MD_SB_SECTORS			(MD_SB_BYTES / 512)
-
-/*
- * The following are counted in 32-bit words
- */
-#define	MD_SB_GENERIC_OFFSET		0
-#define MD_SB_PERSONALITY_OFFSET	64
-#define MD_SB_DISKS_OFFSET		128
-#define MD_SB_DESCRIPTOR_OFFSET		992
-
-#define MD_SB_GENERIC_CONSTANT_WORDS	32
-#define MD_SB_GENERIC_STATE_WORDS	32
-#define MD_SB_GENERIC_WORDS		(MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
-#define MD_SB_PERSONALITY_WORDS		64
-#define MD_SB_DISKS_WORDS		384
-#define MD_SB_DESCRIPTOR_WORDS		32
-#define MD_SB_RESERVED_WORDS		(1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
-#define MD_SB_EQUAL_WORDS		(MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
-#define MD_SB_DISKS			(MD_SB_DISKS_WORDS / MD_SB_DESCRIPTOR_WORDS)
-
-/*
- * Device "operational" state bits
- */
-#define MD_FAULTY_DEVICE		0	/* Device is faulty / operational */
-#define MD_ACTIVE_DEVICE		1	/* Device is a part or the raid set / spare disk */
-#define MD_SYNC_DEVICE			2	/* Device is in sync with the raid set */
-
-typedef struct md_device_descriptor_s {
-	__u32 number;		/* 0 Device number in the entire set */
-	__u32 major;		/* 1 Device major number */
-	__u32 minor;		/* 2 Device minor number */
-	__u32 raid_disk;	/* 3 The role of the device in the raid set */
-	__u32 state;		/* 4 Operational state */
-	__u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
-} md_descriptor_t;
-
-#define MD_SB_MAGIC		0xa92b4efc
-
-/*
- * Superblock state bits
- */
-#define MD_SB_CLEAN		0
-#define MD_SB_ERRORS		1
-
-typedef struct md_superblock_s {
-
-	/*
-	 * Constant generic information
-	 */
-	__u32 md_magic;		/*  0 MD identifier */
-	__u32 major_version;	/*  1 major version to which the set conforms */
-	__u32 minor_version;	/*  2 minor version to which the set conforms */
-	__u32 patch_version;	/*  3 patchlevel version to which the set conforms */
-	__u32 gvalid_words;	/*  4 Number of non-reserved words in this section */
-	__u32 set_magic;	/*  5 Raid set identifier */
-	__u32 ctime;		/*  6 Creation time */
-	__u32 level;		/*  7 Raid personality (mirroring, raid5, ...) */
-	__u32 size;		/*  8 Apparent size of each individual disk, in kB */
-	__u32 nr_disks;		/*  9 Number of total disks in the raid set */
-	__u32 raid_disks;	/* 10 Number of disks in a fully functional raid set */
-	__u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 11];
-
-	/*
-	 * Generic state information
-	 */
-	__u32 utime;		/*  0 Superblock update time */
-	__u32 state;		/*  1 State bits (clean, ...) */
-	__u32 active_disks;	/*  2 Number of currently active disks (some non-faulty disks might not be in sync) */
-	__u32 working_disks;	/*  3 Number of working disks */
-	__u32 failed_disks;	/*  4 Number of failed disks */
-	__u32 spare_disks;	/*  5 Number of spare disks */
-	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 6];
-
-	/*
-	 * Personality information
-	 */
-	__u32 parity_algorithm;
-	__u32 chunk_size;
-	__u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 2];
-
-	/*
-	 * Disks information
-	 */
-	md_descriptor_t disks[MD_SB_DISKS];
-
-	/*
-	 * Reserved
-	 */
-	__u32 reserved[MD_SB_RESERVED_WORDS];
-
-	/*
-	 * Active descriptor
-	 */
-	md_descriptor_t descriptor;
-} md_superblock_t;
-
-#ifdef __KERNEL__
-
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/blkdev.h>
-#include <asm/semaphore.h>
-
-/*
- * Kernel-based reconstruction is mostly working, but still requires
- * some additional work.
- */
-#define SUPPORT_RECONSTRUCTION	0
-
-#define MAX_REAL     8		/* Max number of physical dev per md dev */
-#define MAX_MD_DEV   4		/* Max number of md dev */
-
-#define FACTOR(a)         ((a)->repartition & FACTOR_MASK)
-#define MAX_FAULT(a)      (((a)->repartition & FAULT_MASK)>>8)
-#define PERSONALITY(a)    ((a)->repartition & PERSONALITY_MASK)
-
-#define FACTOR_SHIFT(a) (PAGE_SHIFT + (a) - 10)
-
-struct real_dev
-{
-  kdev_t dev;			/* Device number */
-  int size;			/* Device size (in blocks) */
-  int offset;			/* Real device offset (in blocks) in md dev
-				   (only used in linear mode) */
-  struct inode *inode;		/* Lock inode */
-  md_superblock_t *sb;
-  u32 sb_offset;
-};
-
-struct md_dev;
-
-#define SPARE_INACTIVE	0
-#define SPARE_WRITE	1
-#define SPARE_ACTIVE	2
-
-struct md_personality
-{
-  char *name;
-  int (*map)(struct md_dev *mddev, kdev_t *rdev,
-	              unsigned long *rsector, unsigned long size);
-  int (*make_request)(struct md_dev *mddev, int rw, struct buffer_head * bh);
-  void (*end_request)(struct buffer_head * bh, int uptodate);
-  int (*run)(int minor, struct md_dev *mddev);
-  int (*stop)(int minor, struct md_dev *mddev);
-  int (*status)(char *page, int minor, struct md_dev *mddev);
-  int (*ioctl)(struct inode *inode, struct file *file,
-	       unsigned int cmd, unsigned long arg);
-  int max_invalid_dev;
-  int (*error_handler)(struct md_dev *mddev, kdev_t dev);
-
-/*
- * Some personalities (RAID-1, RAID-5) can get disks hot-added and
- * hot-removed. Hot removal is different from failure. (failure marks
- * a disk inactive, but the disk is still part of the array)
- */
-  int (*hot_add_disk) (struct md_dev *mddev, kdev_t dev);
-  int (*hot_remove_disk) (struct md_dev *mddev, kdev_t dev);
-  int (*mark_spare) (struct md_dev *mddev, md_descriptor_t *descriptor, int state);
-};
-
-struct md_dev
-{
-  struct real_dev	devices[MAX_REAL];
-  struct md_personality	*pers;
-  md_superblock_t	*sb;
-  int			sb_dirty;
-  int			repartition;
-  int			busy;
-  int			nb_dev;
-  void			*private;
-};
-
-struct md_thread {
-	void			(*run) (void *data);
-	void			*data;
-	wait_queue_head_t	wqueue;
-	unsigned long           flags;
-	struct semaphore	*sem;
-	struct task_struct	*tsk;
-};
-
-#define THREAD_WAKEUP  0
-
-extern struct md_dev md_dev[MAX_MD_DEV];
-extern int md_size[MAX_MD_DEV];
-extern int md_maxreadahead[MAX_MD_DEV];
-
-extern char *partition_name (kdev_t dev);
-
-extern int register_md_personality (int p_num, struct md_personality *p);
-extern int unregister_md_personality (int p_num);
-extern struct md_thread *md_register_thread (void (*run) (void *data), void *data);
-extern void md_unregister_thread (struct md_thread *thread);
-extern void md_wakeup_thread(struct md_thread *thread);
-extern int md_update_sb (int minor);
-extern int md_do_sync(struct md_dev *mddev);
-
-#endif __KERNEL__
-#endif _MD_H