Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md: (53 commits) md/raid5 revise rules for when to update metadata during reshape md/raid5: minor code cleanups in make_request. md: remove CONFIG_MD_RAID_RESHAPE config option. md/raid5: be more careful about write ordering when reshaping. md: don't display meaningless values in sysfs files resync_start and sync_speed md/raid5: allow layout and chunksize to be changed on active array. md/raid5: reshape using largest of old and new chunk size md/raid5: prepare for allowing reshape to change layout md/raid5: prepare for allowing reshape to change chunksize. md/raid5: clearly differentiate 'before' and 'after' stripes during reshape. Documentation/md.txt update md: allow number of drives in raid5 to be reduced md/raid5: change reshape-progress measurement to cope with reshaping backwards. md: add explicit method to signal the end of a reshape. md/raid5: enhance raid5_size to work correctly with negative delta_disks md/raid5: drop qd_idx from r6_state md/raid6: move raid6 data processing to raid6_pq.ko md: raid5 run(): Fix max_degraded for raid level 4. md: 'array_size' sysfs attribute md: centralize ->array_sectors modifications ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2009-04-03 09:08:19 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2009-04-03 09:08:19 -0700
commit: 223cdea4c4b5af5181b2da00ac85711d1e0c737c (patch)
tree: dfe7226c70ddabbf2e2e63924ba636345278e79c /include
parent: 31e6e2dac575c9d21a6ec56ca52ae89086baa705 (diff)
parent: c8f517c444e4f9f55b5b5ca202b8404691a35805 (diff)
12 files changed, 167 insertions, 1535 deletions
diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
deleted file mode 100644
index e98900671ca..00000000000
--- a/include/linux/raid/bitmap.h
+++ /dev/null
@@ -1,288 +0,0 @@
-/*
- * bitmap.h: Copyright (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
- *
- * additions: Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
- */
-#ifndef BITMAP_H
-#define BITMAP_H 1
-
-#define BITMAP_MAJOR_LO 3
-/* version 4 insists the bitmap is in little-endian order
- * with version 3, it is host-endian which is non-portable
- */
-#define BITMAP_MAJOR_HI 4
-#define	BITMAP_MAJOR_HOSTENDIAN 3
-
-#define BITMAP_MINOR 39
-
-/*
- * in-memory bitmap:
- *
- * Use 16 bit block counters to track pending writes to each "chunk".
- * The 2 high order bits are special-purpose, the first is a flag indicating
- * whether a resync is needed.  The second is a flag indicating whether a
- * resync is active.
- * This means that the counter is actually 14 bits:
- *
- * +--------+--------+------------------------------------------------+
- * | resync | resync |               counter                          |
- * | needed | active |                                                |
- * |  (0-1) |  (0-1) |              (0-16383)                         |
- * +--------+--------+------------------------------------------------+
- *
- * The "resync needed" bit is set when:
- *    a '1' bit is read from storage at startup.
- *    a write request fails on some drives
- *    a resync is aborted on a chunk with 'resync active' set
- * It is cleared (and resync-active set) when a resync starts across all drives
- * of the chunk.
- *
- *
- * The "resync active" bit is set when:
- *    a resync is started on all drives, and resync_needed is set.
- *       resync_needed will be cleared (as long as resync_active wasn't already set).
- * It is cleared when a resync completes.
- *
- * The counter counts pending write requests, plus the on-disk bit.
- * When the counter is '1' and the resync bits are clear, the on-disk
- * bit can be cleared aswell, thus setting the counter to 0.
- * When we set a bit, or in the counter (to start a write), if the fields is
- * 0, we first set the disk bit and set the counter to 1.
- *
- * If the counter is 0, the on-disk bit is clear and the stipe is clean
- * Anything that dirties the stipe pushes the counter to 2 (at least)
- * and sets the on-disk bit (lazily).
- * If a periodic sweep find the counter at 2, it is decremented to 1.
- * If the sweep find the counter at 1, the on-disk bit is cleared and the
- * counter goes to zero.
- *
- * Also, we'll hijack the "map" pointer itself and use it as two 16 bit block
- * counters as a fallback when "page" memory cannot be allocated:
- *
- * Normal case (page memory allocated):
- *
- *     page pointer (32-bit)
- *
- *     [ ] ------+
- *               |
- *               +-------> [   ][   ]..[   ] (4096 byte page == 2048 counters)
- *                          c1   c2    c2048
- *
- * Hijacked case (page memory allocation failed):
- *
- *     hijacked page pointer (32-bit)
- *
- *     [		  ][		  ] (no page memory allocated)
- *      counter #1 (16-bit) counter #2 (16-bit)
- *
- */
-
-#ifdef __KERNEL__
-
-#define PAGE_BITS (PAGE_SIZE << 3)
-#define PAGE_BIT_SHIFT (PAGE_SHIFT + 3)
-
-typedef __u16 bitmap_counter_t;
-#define COUNTER_BITS 16
-#define COUNTER_BIT_SHIFT 4
-#define COUNTER_BYTE_RATIO (COUNTER_BITS / 8)
-#define COUNTER_BYTE_SHIFT (COUNTER_BIT_SHIFT - 3)
-
-#define NEEDED_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 1)))
-#define RESYNC_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 2)))
-#define COUNTER_MAX ((bitmap_counter_t) RESYNC_MASK - 1)
-#define NEEDED(x) (((bitmap_counter_t) x) & NEEDED_MASK)
-#define RESYNC(x) (((bitmap_counter_t) x) & RESYNC_MASK)
-#define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX)
-
-/* how many counters per page? */
-#define PAGE_COUNTER_RATIO (PAGE_BITS / COUNTER_BITS)
-/* same, except a shift value for more efficient bitops */
-#define PAGE_COUNTER_SHIFT (PAGE_BIT_SHIFT - COUNTER_BIT_SHIFT)
-/* same, except a mask value for more efficient bitops */
-#define PAGE_COUNTER_MASK  (PAGE_COUNTER_RATIO - 1)
-
-#define BITMAP_BLOCK_SIZE 512
-#define BITMAP_BLOCK_SHIFT 9
-
-/* how many blocks per chunk? (this is variable) */
-#define CHUNK_BLOCK_RATIO(bitmap) ((bitmap)->chunksize >> BITMAP_BLOCK_SHIFT)
-#define CHUNK_BLOCK_SHIFT(bitmap) ((bitmap)->chunkshift - BITMAP_BLOCK_SHIFT)
-#define CHUNK_BLOCK_MASK(bitmap) (CHUNK_BLOCK_RATIO(bitmap) - 1)
-
-/* when hijacked, the counters and bits represent even larger "chunks" */
-/* there will be 1024 chunks represented by each counter in the page pointers */
-#define PAGEPTR_BLOCK_RATIO(bitmap) \
-			(CHUNK_BLOCK_RATIO(bitmap) << PAGE_COUNTER_SHIFT >> 1)
-#define PAGEPTR_BLOCK_SHIFT(bitmap) \
-			(CHUNK_BLOCK_SHIFT(bitmap) + PAGE_COUNTER_SHIFT - 1)
-#define PAGEPTR_BLOCK_MASK(bitmap) (PAGEPTR_BLOCK_RATIO(bitmap) - 1)
-
-/*
- * on-disk bitmap:
- *
- * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
- * file a page at a time. There's a superblock at the start of the file.
- */
-
-/* map chunks (bits) to file pages - offset by the size of the superblock */
-#define CHUNK_BIT_OFFSET(chunk) ((chunk) + (sizeof(bitmap_super_t) << 3))
-
-#endif
-
-/*
- * bitmap structures:
- */
-
-#define BITMAP_MAGIC 0x6d746962
-
-/* use these for bitmap->flags and bitmap->sb->state bit-fields */
-enum bitmap_state {
-	BITMAP_STALE  = 0x002,  /* the bitmap file is out of date or had -EIO */
-	BITMAP_WRITE_ERROR = 0x004, /* A write error has occurred */
-	BITMAP_HOSTENDIAN = 0x8000,
-};
-
-/* the superblock at the front of the bitmap file -- little endian */
-typedef struct bitmap_super_s {
-	__le32 magic;        /*  0  BITMAP_MAGIC */
-	__le32 version;      /*  4  the bitmap major for now, could change... */
-	__u8  uuid[16];      /*  8  128 bit uuid - must match md device uuid */
-	__le64 events;       /* 24  event counter for the bitmap (1)*/
-	__le64 events_cleared;/*32  event counter when last bit cleared (2) */
-	__le64 sync_size;    /* 40  the size of the md device's sync range(3) */
-	__le32 state;        /* 48  bitmap state information */
-	__le32 chunksize;    /* 52  the bitmap chunk size in bytes */
-	__le32 daemon_sleep; /* 56  seconds between disk flushes */
-	__le32 write_behind; /* 60  number of outstanding write-behind writes */
-
-	__u8  pad[256 - 64]; /* set to zero */
-} bitmap_super_t;
-
-/* notes:
- * (1) This event counter is updated before the eventcounter in the md superblock
- *    When a bitmap is loaded, it is only accepted if this event counter is equal
- *    to, or one greater than, the event counter in the superblock.
- * (2) This event counter is updated when the other one is *if*and*only*if* the
- *    array is not degraded.  As bits are not cleared when the array is degraded,
- *    this represents the last time that any bits were cleared.
- *    If a device is being added that has an event count with this value or
- *    higher, it is accepted as conforming to the bitmap.
- * (3)This is the number of sectors represented by the bitmap, and is the range that
- *    resync happens across.  For raid1 and raid5/6 it is the size of individual
- *    devices.  For raid10 it is the size of the array.
- */
-
-#ifdef __KERNEL__
-
-/* the in-memory bitmap is represented by bitmap_pages */
-struct bitmap_page {
-	/*
-	 * map points to the actual memory page
-	 */
-	char *map;
-	/*
-	 * in emergencies (when map cannot be alloced), hijack the map
-	 * pointer and use it as two counters itself
-	 */
-	unsigned int hijacked:1;
-	/*
-	 * count of dirty bits on the page
-	 */
-	unsigned int  count:31;
-};
-
-/* keep track of bitmap file pages that have pending writes on them */
-struct page_list {
-	struct list_head list;
-	struct page *page;
-};
-
-/* the main bitmap structure - one per mddev */
-struct bitmap {
-	struct bitmap_page *bp;
-	unsigned long pages; /* total number of pages in the bitmap */
-	unsigned long missing_pages; /* number of pages not yet allocated */
-
-	mddev_t *mddev; /* the md device that the bitmap is for */
-
-	int counter_bits; /* how many bits per block counter */
-
-	/* bitmap chunksize -- how much data does each bit represent? */
-	unsigned long chunksize;
-	unsigned long chunkshift; /* chunksize = 2^chunkshift (for bitops) */
-	unsigned long chunks; /* total number of data chunks for the array */
-
-	/* We hold a count on the chunk currently being synced, and drop
-	 * it when the last block is started.  If the resync is aborted
-	 * midway, we need to be able to drop that count, so we remember
-	 * the counted chunk..
-	 */
-	unsigned long syncchunk;
-
-	__u64	events_cleared;
-	int need_sync;
-
-	/* bitmap spinlock */
-	spinlock_t lock;
-
-	long offset; /* offset from superblock if file is NULL */
-	struct file *file; /* backing disk file */
-	struct page *sb_page; /* cached copy of the bitmap file superblock */
-	struct page **filemap; /* list of cache pages for the file */
-	unsigned long *filemap_attr; /* attributes associated w/ filemap pages */
-	unsigned long file_pages; /* number of pages in the file */
-	int last_page_size; /* bytes in the last page */
-
-	unsigned long flags;
-
-	int allclean;
-
-	unsigned long max_write_behind; /* write-behind mode */
-	atomic_t behind_writes;
-
-	/*
-	 * the bitmap daemon - periodically wakes up and sweeps the bitmap
-	 * file, cleaning up bits and flushing out pages to disk as necessary
-	 */
-	unsigned long daemon_lastrun; /* jiffies of last run */
-	unsigned long daemon_sleep; /* how many seconds between updates? */
-	unsigned long last_end_sync; /* when we lasted called end_sync to
-				      * update bitmap with resync progress */
-
-	atomic_t pending_writes; /* pending writes to the bitmap file */
-	wait_queue_head_t write_wait;
-	wait_queue_head_t overflow_wait;
-
-};
-
-/* the bitmap API */
-
-/* these are used only by md/bitmap */
-int  bitmap_create(mddev_t *mddev);
-void bitmap_flush(mddev_t *mddev);
-void bitmap_destroy(mddev_t *mddev);
-
-void bitmap_print_sb(struct bitmap *bitmap);
-void bitmap_update_sb(struct bitmap *bitmap);
-
-int  bitmap_setallbits(struct bitmap *bitmap);
-void bitmap_write_all(struct bitmap *bitmap);
-
-void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e);
-
-/* these are exported */
-int bitmap_startwrite(struct bitmap *bitmap, sector_t offset,
-			unsigned long sectors, int behind);
-void bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
-			unsigned long sectors, int success, int behind);
-int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int degraded);
-void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted);
-void bitmap_close_sync(struct bitmap *bitmap);
-void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector);
-
-void bitmap_unplug(struct bitmap *bitmap);
-void bitmap_daemon_work(struct bitmap *bitmap);
-#endif
-
-#endif
diff --git a/include/linux/raid/linear.h b/include/linux/raid/linear.h
deleted file mode 100644
index f38b9c586af..00000000000
--- a/include/linux/raid/linear.h
+++ /dev/null
@@ -1,31 +0,0 @@
-#ifndef _LINEAR_H
-#define _LINEAR_H
-
-#include <linux/raid/md.h>
-
-struct dev_info {
-	mdk_rdev_t	*rdev;
-	sector_t	num_sectors;
-	sector_t	start_sector;
-};
-
-typedef struct dev_info dev_info_t;
-
-struct linear_private_data
-{
-	struct linear_private_data *prev;	/* earlier version */
-	dev_info_t		**hash_table;
-	sector_t		spacing;
-	sector_t		array_sectors;
-	int			sector_shift;	/* shift before dividing
-						 * by spacing
-						 */
-	dev_info_t		disks[0];
-};
-
-
-typedef struct linear_private_data linear_conf_t;
-
-#define mddev_to_conf(mddev) ((linear_conf_t *) mddev->private)
-
-#endif
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
deleted file mode 100644
index 82bea14cae1..00000000000
--- a/include/linux/raid/md.h
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
-   md.h : Multiple Devices driver for Linux
-          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
-          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/blkdev.h>
-#include <linux/seq_file.h>
-
-/*
- * 'md_p.h' holds the 'physical' layout of RAID devices
- * 'md_u.h' holds the user <=> kernel API
- *
- * 'md_k.h' holds kernel internal definitions
- */
-
-#include <linux/raid/md_p.h>
-#include <linux/raid/md_u.h>
-#include <linux/raid/md_k.h>
-
-#ifdef CONFIG_MD
-
-/*
- * 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                90
-/*
- * MD_PATCHLEVEL_VERSION indicates kernel functionality.
- * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
- *     and major_version/minor_version accordingly
- * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
- *     in the super status byte
- * >=3 means that bitmap superblock version 4 is supported, which uses
- *     little-ending representation rather than host-endian
- */
-#define MD_PATCHLEVEL_VERSION           3
-
-extern int mdp_major;
-
-extern int register_md_personality(struct mdk_personality *p);
-extern int unregister_md_personality(struct mdk_personality *p);
-extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),
-				mddev_t *mddev, const char *name);
-extern void md_unregister_thread(mdk_thread_t *thread);
-extern void md_wakeup_thread(mdk_thread_t *thread);
-extern void md_check_recovery(mddev_t *mddev);
-extern void md_write_start(mddev_t *mddev, struct bio *bi);
-extern void md_write_end(mddev_t *mddev);
-extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
-extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
-
-extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
-			   sector_t sector, int size, struct page *page);
-extern void md_super_wait(mddev_t *mddev);
-extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
-			struct page *page, int rw);
-extern void md_do_sync(mddev_t *mddev);
-extern void md_new_event(mddev_t *mddev);
-extern int md_allow_write(mddev_t *mddev);
-extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
-
-#endif /* CONFIG_MD */
-#endif 
-
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
deleted file mode 100644
index 9743e4dbc91..00000000000
--- a/include/linux/raid/md_k.h
+++ /dev/null
@@ -1,402 +0,0 @@
-/*
-   md_k.h : kernel internal structure of the Linux MD driver
-          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
-	  
-   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_K_H
-#define _MD_K_H
-
-/* and dm-bio-list.h is not under include/linux because.... ??? */
-#include "../../../drivers/md/dm-bio-list.h"
-
-#ifdef CONFIG_BLOCK
-
-#define	LEVEL_MULTIPATH		(-4)
-#define	LEVEL_LINEAR		(-1)
-#define	LEVEL_FAULTY		(-5)
-
-/* we need a value for 'no level specified' and 0
- * means 'raid0', so we need something else.  This is
- * for internal use only
- */
-#define	LEVEL_NONE		(-1000000)
-
-#define MaxSector (~(sector_t)0)
-
-typedef struct mddev_s mddev_t;
-typedef struct mdk_rdev_s mdk_rdev_t;
-
-/*
- * options passed in raidrun:
- */
-
-/* Currently this must fit in an 'int' */
-#define MAX_CHUNK_SIZE (1<<30)
-
-/*
- * MD's 'extended' device
- */
-struct mdk_rdev_s
-{
-	struct list_head same_set;	/* RAID devices within the same set */
-
-	sector_t size;			/* Device size (in blocks) */
-	mddev_t *mddev;			/* RAID array if running */
-	long last_events;		/* IO event timestamp */
-
-	struct block_device *bdev;	/* block device handle */
-
-	struct page	*sb_page;
-	int		sb_loaded;
-	__u64		sb_events;
-	sector_t	data_offset;	/* start of data in array */
-	sector_t 	sb_start;	/* offset of the super block (in 512byte sectors) */
-	int		sb_size;	/* bytes in the superblock */
-	int		preferred_minor;	/* autorun support */
-
-	struct kobject	kobj;
-
-	/* A device can be in one of three states based on two flags:
-	 * Not working:   faulty==1 in_sync==0
-	 * Fully working: faulty==0 in_sync==1
-	 * Working, but not
-	 * in sync with array
-	 *                faulty==0 in_sync==0
-	 *
-	 * It can never have faulty==1, in_sync==1
-	 * This reduces the burden of testing multiple flags in many cases
-	 */
-
-	unsigned long	flags;
-#define	Faulty		1		/* device is known to have a fault */
-#define	In_sync		2		/* device is in_sync with rest of array */
-#define	WriteMostly	4		/* Avoid reading if at all possible */
-#define	BarriersNotsupp	5		/* BIO_RW_BARRIER is not supported */
-#define	AllReserved	6		/* If whole device is reserved for
-					 * one array */
-#define	AutoDetected	7		/* added by auto-detect */
-#define Blocked		8		/* An error occured on an externally
-					 * managed array, don't allow writes
-					 * until it is cleared */
-#define StateChanged	9		/* Faulty or Blocked has changed during
-					 * interrupt, so it needs to be
-					 * notified by the thread */
-	wait_queue_head_t blocked_wait;
-
-	int desc_nr;			/* descriptor index in the superblock */
-	int raid_disk;			/* role of device in array */
-	int saved_raid_disk;		/* role that device used to have in the
-					 * array and could again if we did a partial
-					 * resync from the bitmap
-					 */
-	sector_t	recovery_offset;/* If this device has been partially
-					 * recovered, this is where we were
-					 * up to.
-					 */
-
-	atomic_t	nr_pending;	/* number of pending requests.
-					 * only maintained for arrays that
-					 * support hot removal
-					 */
-	atomic_t	read_errors;	/* number of consecutive read errors that
-					 * we have tried to ignore.
-					 */
-	atomic_t	corrected_errors; /* number of corrected read errors,
-					   * for reporting to userspace and storing
-					   * in superblock.
-					   */
-	struct work_struct del_work;	/* used for delayed sysfs removal */
-
-	struct sysfs_dirent *sysfs_state; /* handle for 'state'
-					   * sysfs entry */
-};
-
-struct mddev_s
-{
-	void				*private;
-	struct mdk_personality		*pers;
-	dev_t				unit;
-	int				md_minor;
-	struct list_head 		disks;
-	unsigned long			flags;
-#define MD_CHANGE_DEVS	0	/* Some device status has changed */
-#define MD_CHANGE_CLEAN 1	/* transition to or from 'clean' */
-#define MD_CHANGE_PENDING 2	/* superblock update in progress */
-
-	int				ro;
-
-	struct gendisk			*gendisk;
-
-	struct kobject			kobj;
-	int				hold_active;
-#define	UNTIL_IOCTL	1
-#define	UNTIL_STOP	2
-
-	/* Superblock information */
-	int				major_version,
-					minor_version,
-					patch_version;
-	int				persistent;
-	int 				external;	/* metadata is
-							 * managed externally */
-	char				metadata_type[17]; /* externally set*/
-	int				chunk_size;
-	time_t				ctime, utime;
-	int				level, layout;
-	char				clevel[16];
-	int				raid_disks;
-	int				max_disks;
-	sector_t			size; /* used size of component devices */
-	sector_t			array_sectors; /* exported array size */
-	__u64				events;
-
-	char				uuid[16];
-
-	/* If the array is being reshaped, we need to record the
-	 * new shape and an indication of where we are up to.
-	 * This is written to the superblock.
-	 * If reshape_position is MaxSector, then no reshape is happening (yet).
-	 */
-	sector_t			reshape_position;
-	int				delta_disks, new_level, new_layout, new_chunk;
-
-	struct mdk_thread_s		*thread;	/* management thread */
-	struct mdk_thread_s		*sync_thread;	/* doing resync or reconstruct */
-	sector_t			curr_resync;	/* last block scheduled */
-	unsigned long			resync_mark;	/* a recent timestamp */
-	sector_t			resync_mark_cnt;/* blocks written at resync_mark */
-	sector_t			curr_mark_cnt; /* blocks scheduled now */
-
-	sector_t			resync_max_sectors; /* may be set by personality */
-
-	sector_t			resync_mismatches; /* count of sectors where
-							    * parity/replica mismatch found
-							    */
-
-	/* allow user-space to request suspension of IO to regions of the array */
-	sector_t			suspend_lo;
-	sector_t			suspend_hi;
-	/* if zero, use the system-wide default */
-	int				sync_speed_min;
-	int				sync_speed_max;
-
-	/* resync even though the same disks are shared among md-devices */
-	int				parallel_resync;
-
-	int				ok_start_degraded;
-	/* recovery/resync flags 
-	 * NEEDED:   we might need to start a resync/recover
-	 * RUNNING:  a thread is running, or about to be started
-	 * SYNC:     actually doing a resync, not a recovery
-	 * RECOVER:  doing recovery, or need to try it.
-	 * INTR:     resync needs to be aborted for some reason
-	 * DONE:     thread is done and is waiting to be reaped
-	 * REQUEST:  user-space has requested a sync (used with SYNC)
-	 * CHECK:    user-space request for for check-only, no repair
-	 * RESHAPE:  A reshape is happening
-	 *
-	 * If neither SYNC or RESHAPE are set, then it is a recovery.
-	 */
-#define	MD_RECOVERY_RUNNING	0
-#define	MD_RECOVERY_SYNC	1
-#define	MD_RECOVERY_RECOVER	2
-#define	MD_RECOVERY_INTR	3
-#define	MD_RECOVERY_DONE	4
-#define	MD_RECOVERY_NEEDED	5
-#define	MD_RECOVERY_REQUESTED	6
-#define	MD_RECOVERY_CHECK	7
-#define MD_RECOVERY_RESHAPE	8
-#define	MD_RECOVERY_FROZEN	9
-
-	unsigned long			recovery;
-	int				recovery_disabled; /* if we detect that recovery
-							    * will always fail, set this
-							    * so we don't loop trying */
-
-	int				in_sync;	/* know to not need resync */
-	struct mutex			reconfig_mutex;
-	atomic_t			active;		/* general refcount */
-	atomic_t			openers;	/* number of active opens */
-
-	int				changed;	/* true if we might need to reread partition info */
-	int				degraded;	/* whether md should consider
-							 * adding a spare
-							 */
-	int				barriers_work;	/* initialised to true, cleared as soon
-							 * as a barrier request to slave
-							 * fails.  Only supported
-							 */
-	struct bio			*biolist; 	/* bios that need to be retried
-							 * because BIO_RW_BARRIER is not supported
-							 */
-
-	atomic_t			recovery_active; /* blocks scheduled, but not written */
-	wait_queue_head_t		recovery_wait;
-	sector_t			recovery_cp;
-	sector_t			resync_min;	/* user requested sync
-							 * starts here */
-	sector_t			resync_max;	/* resync should pause
-							 * when it gets here */
-
-	struct sysfs_dirent		*sysfs_state;	/* handle for 'array_state'
-							 * file in sysfs.
-							 */
-	struct sysfs_dirent		*sysfs_action;  /* handle for 'sync_action' */
-
-	struct work_struct del_work;	/* used for delayed sysfs removal */
-
-	spinlock_t			write_lock;
-	wait_queue_head_t		sb_wait;	/* for waiting on superblock updates */
-	atomic_t			pending_writes;	/* number of active superblock writes */
-
-	unsigned int			safemode;	/* if set, update "clean" superblock
-							 * when no writes pending.
-							 */ 
-	unsigned int			safemode_delay;
-	struct timer_list		safemode_timer;
-	atomic_t			writes_pending; 
-	struct request_queue		*queue;	/* for plugging ... */
-
-	atomic_t                        write_behind; /* outstanding async IO */
-	unsigned int                    max_write_behind; /* 0 = sync */
-
-	struct bitmap                   *bitmap; /* the bitmap for the device */
-	struct file			*bitmap_file; /* the bitmap file */
-	long				bitmap_offset; /* offset from superblock of
-							* start of bitmap. May be
-							* negative, but not '0'
-							*/
-	long				default_bitmap_offset; /* this is the offset to use when
-								* hot-adding a bitmap.  It should
-								* eventually be settable by sysfs.
-								*/
-
-	struct list_head		all_mddevs;
-};
-
-
-static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
-{
-	int faulty = test_bit(Faulty, &rdev->flags);
-	if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
-		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-}
-
-static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
-{
-        atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
-}
-
-struct mdk_personality
-{
-	char *name;
-	int level;
-	struct list_head list;
-	struct module *owner;
-	int (*make_request)(struct request_queue *q, struct bio *bio);
-	int (*run)(mddev_t *mddev);
-	int (*stop)(mddev_t *mddev);
-	void (*status)(struct seq_file *seq, mddev_t *mddev);
-	/* error_handler must set ->faulty and clear ->in_sync
-	 * if appropriate, and should abort recovery if needed 
-	 */
-	void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev);
-	int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
-	int (*hot_remove_disk) (mddev_t *mddev, int number);
-	int (*spare_active) (mddev_t *mddev);
-	sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
-	int (*resize) (mddev_t *mddev, sector_t sectors);
-	int (*check_reshape) (mddev_t *mddev);
-	int (*start_reshape) (mddev_t *mddev);
-	int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
-	/* quiesce moves between quiescence states
-	 * 0 - fully active
-	 * 1 - no new requests allowed
-	 * others - reserved
-	 */
-	void (*quiesce) (mddev_t *mddev, int state);
-};
-
-
-struct md_sysfs_entry {
-	struct attribute attr;
-	ssize_t (*show)(mddev_t *, char *);
-	ssize_t (*store)(mddev_t *, const char *, size_t);
-};
-
-
-static inline char * mdname (mddev_t * mddev)
-{
-	return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
-}
-
-/*
- * iterates through some rdev ringlist. It's safe to remove the
- * current 'rdev'. Dont touch 'tmp' though.
- */
-#define rdev_for_each_list(rdev, tmp, head)				\
-	list_for_each_entry_safe(rdev, tmp, head, same_set)
-
-/*
- * iterates through the 'same array disks' ringlist
- */
-#define rdev_for_each(rdev, tmp, mddev)				\
-	list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
-
-#define rdev_for_each_rcu(rdev, mddev)				\
-	list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
-
-typedef struct mdk_thread_s {
-	void			(*run) (mddev_t *mddev);
-	mddev_t			*mddev;
-	wait_queue_head_t	wqueue;
-	unsigned long           flags;
-	struct task_struct	*tsk;
-	unsigned long		timeout;
-} mdk_thread_t;
-
-#define THREAD_WAKEUP  0
-
-#define __wait_event_lock_irq(wq, condition, lock, cmd) 		\
-do {									\
-	wait_queue_t __wait;						\
-	init_waitqueue_entry(&__wait, current);				\
-									\
-	add_wait_queue(&wq, &__wait);					\
-	for (;;) {							\
-		set_current_state(TASK_UNINTERRUPTIBLE);		\
-		if (condition)						\
-			break;						\
-		spin_unlock_irq(&lock);					\
-		cmd;							\
-		schedule();						\
-		spin_lock_irq(&lock);					\
-	}								\
-	current->state = TASK_RUNNING;					\
-	remove_wait_queue(&wq, &__wait);				\
-} while (0)
-
-#define wait_event_lock_irq(wq, condition, lock, cmd) 			\
-do {									\
-	if (condition)	 						\
-		break;							\
-	__wait_event_lock_irq(wq, condition, lock, cmd);		\
-} while (0)
-
-static inline void safe_put_page(struct page *p)
-{
-	if (p) put_page(p);
-}
-
-#endif /* CONFIG_BLOCK */
-#endif
-
diff --git a/include/linux/raid/md_u.h b/include/linux/raid/md_u.h
index 7192035fc4b..fb1abb3367e 100644
--- a/include/linux/raid/md_u.h
+++ b/include/linux/raid/md_u.h
@@ -15,6 +15,24 @@
 #ifndef _MD_U_H
 #define _MD_U_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                90
+/*
+ * MD_PATCHLEVEL_VERSION indicates kernel functionality.
+ * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
+ *     and major_version/minor_version accordingly
+ * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
+ *     in the super status byte
+ * >=3 means that bitmap superblock version 4 is supported, which uses
+ *     little-ending representation rather than host-endian
+ */
+#define MD_PATCHLEVEL_VERSION           3
+
 /* ioctls */
 
 /* status */
@@ -46,6 +64,12 @@
 #define STOP_ARRAY_RO		_IO (MD_MAJOR, 0x33)
 #define RESTART_ARRAY_RW	_IO (MD_MAJOR, 0x34)
 
+/* 63 partitions with the alternate major number (mdp) */
+#define MdpMinorShift 6
+#ifdef __KERNEL__
+extern int mdp_major;
+#endif
+
 typedef struct mdu_version_s {
 	int major;
 	int minor;
@@ -85,6 +109,17 @@ typedef struct mdu_array_info_s {
 
 } mdu_array_info_t;
 
+/* non-obvious values for 'level' */
+#define	LEVEL_MULTIPATH		(-4)
+#define	LEVEL_LINEAR		(-1)
+#define	LEVEL_FAULTY		(-5)
+
+/* we need a value for 'no level specified' and 0
+ * means 'raid0', so we need something else.  This is
+ * for internal use only
+ */
+#define	LEVEL_NONE		(-1000000)
+
 typedef struct mdu_disk_info_s {
 	/*
 	 * configuration/status of one particular disk
diff --git a/include/linux/raid/multipath.h b/include/linux/raid/multipath.h
deleted file mode 100644
index 6f53fc177a4..00000000000
--- a/include/linux/raid/multipath.h
+++ /dev/null
@@ -1,42 +0,0 @@
-#ifndef _MULTIPATH_H
-#define _MULTIPATH_H
-
-#include <linux/raid/md.h>
-
-struct multipath_info {
-	mdk_rdev_t	*rdev;
-};
-
-struct multipath_private_data {
-	mddev_t			*mddev;
-	struct multipath_info	*multipaths;
-	int			raid_disks;
-	int			working_disks;
-	spinlock_t		device_lock;
-	struct list_head	retry_list;
-
-	mempool_t		*pool;
-};
-
-typedef struct multipath_private_data multipath_conf_t;
-
-/*
- * this is the only point in the RAID code where we violate
- * C type safety. mddev->private is an 'opaque' pointer.
- */
-#define mddev_to_conf(mddev) ((multipath_conf_t *) mddev->private)
-
-/*
- * this is our 'private' 'collective' MULTIPATH buffer head.
- * it contains information about what kind of IO operations were started
- * for this MULTIPATH operation, and about their status:
- */
-
-struct multipath_bh {
-	mddev_t			*mddev;
-	struct bio		*master_bio;
-	struct bio		bio;
-	int			path;
-	struct list_head	retry_list;
-};
-#endif
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
new file mode 100644
index 00000000000..d92480f8285
--- /dev/null
+++ b/include/linux/raid/pq.h
@@ -0,0 +1,132 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright 2003 H. Peter Anvin - All Rights Reserved
+ *
+ *   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, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; in
author	Linus Torvalds <torvalds@linux-foundation.org>	2009-04-03 09:08:19 -0700
committer	Linus Torvalds <torvalds@linux-foundation.org>	2009-04-03 09:08:19 -0700
commit	223cdea4c4b5af5181b2da00ac85711d1e0c737c (patch)
tree	dfe7226c70ddabbf2e2e63924ba636345278e79c /include
parent	31e6e2dac575c9d21a6ec56ca52ae89086baa705 (diff)
parent	c8f517c444e4f9f55b5b5ca202b8404691a35805 (diff)