3d310eb7b3
Before completing a 'write' the md superblock might need to be updated. This is best done by the md_thread. The current code schedules this up and queues the write request for later handling by the md_thread. However some personalities (Raid5/raid6) will deadlock if the md_thread tries to submit requests to its own array. So this patch changes things so the processes submitting the request waits for the superblock to be written and then submits the request itself. This fixes a recently-created deadlock in raid5/raid6 Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/*
|
|
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 <asm/semaphore.h>
|
|
#include <linux/major.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/module.h>
|
|
#include <linux/hdreg.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/delay.h>
|
|
#include <net/checksum.h>
|
|
#include <linux/random.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <asm/io.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/mempool.h>
|
|
#include <linux/list.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/blkpg.h>
|
|
#include <linux/bio.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>
|
|
|
|
/*
|
|
* 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
|
|
#define MD_PATCHLEVEL_VERSION 1
|
|
|
|
extern int register_md_personality (int p_num, mdk_personality_t *p);
|
|
extern int unregister_md_personality (int p_num);
|
|
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_handle_safemode(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_unplug_mddev(mddev_t *mddev);
|
|
|
|
extern void md_print_devices (void);
|
|
|
|
#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
|
|
|
|
#endif
|
|
|