f67055780c
We allow the superblock to record an 'old' and a 'new' geometry, and a position where any conversion is up to. The geometry allows for changing chunksize, layout and level as well as number of devices. When using verion-0.90 superblock, we convert the version to 0.91 while the conversion is happening so that an old kernel will refuse the assemble the array. For version-1, we use a feature bit for the same effect. When starting an array we check for an incomplete reshape and restart the reshape process if needed. If the reshape stopped at an awkward time (like when updating the first stripe) we refuse to assemble the array, and let user-space worry about it. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
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md.h : Multiple Devices driver for Linux
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Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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Copyright (C) 1994-96 Marc ZYNGIER
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<zyngier@ufr-info-p7.ibp.fr> or
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<maz@gloups.fdn.fr>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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You should have received a copy of the GNU General Public License
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(for example /usr/src/linux/COPYING); if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _MD_H
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#define _MD_H
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#include <linux/blkdev.h>
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#include <asm/semaphore.h>
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#include <linux/major.h>
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <linux/hdreg.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/smp_lock.h>
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#include <linux/delay.h>
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#include <net/checksum.h>
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#include <linux/random.h>
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#include <linux/kernel_stat.h>
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#include <asm/io.h>
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#include <linux/completion.h>
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#include <linux/mempool.h>
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#include <linux/list.h>
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#include <linux/reboot.h>
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#include <linux/vmalloc.h>
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#include <linux/blkpg.h>
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#include <linux/bio.h>
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/*
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* 'md_p.h' holds the 'physical' layout of RAID devices
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* 'md_u.h' holds the user <=> kernel API
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*
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* 'md_k.h' holds kernel internal definitions
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*/
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#include <linux/raid/md_p.h>
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#include <linux/raid/md_u.h>
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#include <linux/raid/md_k.h>
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/*
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* Different major versions are not compatible.
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* Different minor versions are only downward compatible.
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* Different patchlevel versions are downward and upward compatible.
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*/
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#define MD_MAJOR_VERSION 0
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#define MD_MINOR_VERSION 90
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/*
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* MD_PATCHLEVEL_VERSION indicates kernel functionality.
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* >=1 means different superblock formats are selectable using SET_ARRAY_INFO
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* and major_version/minor_version accordingly
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* >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
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* in the super status byte
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* >=3 means that bitmap superblock version 4 is supported, which uses
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* little-ending representation rather than host-endian
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*/
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#define MD_PATCHLEVEL_VERSION 3
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extern int register_md_personality (struct mdk_personality *p);
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extern int unregister_md_personality (struct mdk_personality *p);
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extern mdk_thread_t * md_register_thread (void (*run) (mddev_t *mddev),
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mddev_t *mddev, const char *name);
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extern void md_unregister_thread (mdk_thread_t *thread);
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extern void md_wakeup_thread(mdk_thread_t *thread);
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extern void md_check_recovery(mddev_t *mddev);
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extern void md_write_start(mddev_t *mddev, struct bio *bi);
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extern void md_write_end(mddev_t *mddev);
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extern void md_handle_safemode(mddev_t *mddev);
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extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
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extern void md_error (mddev_t *mddev, mdk_rdev_t *rdev);
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extern void md_unplug_mddev(mddev_t *mddev);
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extern void md_print_devices (void);
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extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
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sector_t sector, int size, struct page *page);
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extern void md_super_wait(mddev_t *mddev);
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extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
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struct page *page, int rw);
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extern void md_do_sync(mddev_t *mddev);
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extern void md_new_event(mddev_t *mddev);
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extern void md_update_sb(mddev_t * mddev);
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#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
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#endif
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