forked from Minki/linux
a778b73ff7
Adding a drive to a linear array seems to have stopped working, due to changes elsewhere in md, and insufficient ongoing testing... So the patch to make linear hot-add work in the first place introduced a subtle bug elsewhere that interracts poorly with older version of mdadm. This fixes it all up. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5852 lines
144 KiB
C
5852 lines
144 KiB
C
/*
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md.c : Multiple Devices driver for Linux
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Copyright (C) 1998, 1999, 2000 Ingo Molnar
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completely rewritten, based on the MD driver code from Marc Zyngier
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Changes:
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- RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
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- RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
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- boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
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- kerneld support by Boris Tobotras <boris@xtalk.msk.su>
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- kmod support by: Cyrus Durgin
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- RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
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- Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
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- lots of fixes and improvements to the RAID1/RAID5 and generic
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RAID code (such as request based resynchronization):
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Neil Brown <neilb@cse.unsw.edu.au>.
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- persistent bitmap code
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Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
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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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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/linkage.h>
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#include <linux/raid/md.h>
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#include <linux/raid/bitmap.h>
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#include <linux/sysctl.h>
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#include <linux/buffer_head.h> /* for invalidate_bdev */
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/ctype.h>
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#include <linux/freezer.h>
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#include <linux/init.h>
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#include <linux/file.h>
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#ifdef CONFIG_KMOD
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#include <linux/kmod.h>
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#endif
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#include <asm/unaligned.h>
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#define MAJOR_NR MD_MAJOR
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#define MD_DRIVER
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/* 63 partitions with the alternate major number (mdp) */
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#define MdpMinorShift 6
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#define DEBUG 0
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#define dprintk(x...) ((void)(DEBUG && printk(x)))
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#ifndef MODULE
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static void autostart_arrays (int part);
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#endif
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static LIST_HEAD(pers_list);
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static DEFINE_SPINLOCK(pers_lock);
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static void md_print_devices(void);
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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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/*
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* Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
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* is 1000 KB/sec, so the extra system load does not show up that much.
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* Increase it if you want to have more _guaranteed_ speed. Note that
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* the RAID driver will use the maximum available bandwidth if the IO
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* subsystem is idle. There is also an 'absolute maximum' reconstruction
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* speed limit - in case reconstruction slows down your system despite
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* idle IO detection.
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*
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* you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
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* or /sys/block/mdX/md/sync_speed_{min,max}
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*/
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static int sysctl_speed_limit_min = 1000;
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static int sysctl_speed_limit_max = 200000;
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static inline int speed_min(mddev_t *mddev)
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{
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return mddev->sync_speed_min ?
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mddev->sync_speed_min : sysctl_speed_limit_min;
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}
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static inline int speed_max(mddev_t *mddev)
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{
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return mddev->sync_speed_max ?
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mddev->sync_speed_max : sysctl_speed_limit_max;
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}
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static struct ctl_table_header *raid_table_header;
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static ctl_table raid_table[] = {
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{
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.ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
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.procname = "speed_limit_min",
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.data = &sysctl_speed_limit_min,
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.maxlen = sizeof(int),
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.mode = S_IRUGO|S_IWUSR,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
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.procname = "speed_limit_max",
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.data = &sysctl_speed_limit_max,
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.maxlen = sizeof(int),
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.mode = S_IRUGO|S_IWUSR,
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.proc_handler = &proc_dointvec,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table raid_dir_table[] = {
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{
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.ctl_name = DEV_RAID,
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.procname = "raid",
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.maxlen = 0,
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.mode = S_IRUGO|S_IXUGO,
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.child = raid_table,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table raid_root_table[] = {
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{
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.ctl_name = CTL_DEV,
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.procname = "dev",
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.maxlen = 0,
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.mode = 0555,
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.child = raid_dir_table,
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},
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{ .ctl_name = 0 }
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};
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static struct block_device_operations md_fops;
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static int start_readonly;
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/*
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* We have a system wide 'event count' that is incremented
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* on any 'interesting' event, and readers of /proc/mdstat
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* can use 'poll' or 'select' to find out when the event
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* count increases.
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*
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* Events are:
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* start array, stop array, error, add device, remove device,
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* start build, activate spare
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*/
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static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
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static atomic_t md_event_count;
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void md_new_event(mddev_t *mddev)
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{
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atomic_inc(&md_event_count);
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wake_up(&md_event_waiters);
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sysfs_notify(&mddev->kobj, NULL, "sync_action");
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}
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EXPORT_SYMBOL_GPL(md_new_event);
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/* Alternate version that can be called from interrupts
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* when calling sysfs_notify isn't needed.
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*/
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static void md_new_event_inintr(mddev_t *mddev)
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{
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atomic_inc(&md_event_count);
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wake_up(&md_event_waiters);
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}
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/*
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* Enables to iterate over all existing md arrays
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* all_mddevs_lock protects this list.
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*/
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static LIST_HEAD(all_mddevs);
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static DEFINE_SPINLOCK(all_mddevs_lock);
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/*
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* iterates through all used mddevs in the system.
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* We take care to grab the all_mddevs_lock whenever navigating
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* the list, and to always hold a refcount when unlocked.
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* Any code which breaks out of this loop while own
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* a reference to the current mddev and must mddev_put it.
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*/
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#define ITERATE_MDDEV(mddev,tmp) \
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\
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for (({ spin_lock(&all_mddevs_lock); \
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tmp = all_mddevs.next; \
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mddev = NULL;}); \
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({ if (tmp != &all_mddevs) \
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mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
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spin_unlock(&all_mddevs_lock); \
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if (mddev) mddev_put(mddev); \
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mddev = list_entry(tmp, mddev_t, all_mddevs); \
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tmp != &all_mddevs;}); \
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({ spin_lock(&all_mddevs_lock); \
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tmp = tmp->next;}) \
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)
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static int md_fail_request (request_queue_t *q, struct bio *bio)
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{
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bio_io_error(bio, bio->bi_size);
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return 0;
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}
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static inline mddev_t *mddev_get(mddev_t *mddev)
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{
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atomic_inc(&mddev->active);
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return mddev;
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}
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static void mddev_put(mddev_t *mddev)
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{
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if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
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return;
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if (!mddev->raid_disks && list_empty(&mddev->disks)) {
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list_del(&mddev->all_mddevs);
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spin_unlock(&all_mddevs_lock);
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blk_cleanup_queue(mddev->queue);
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kobject_unregister(&mddev->kobj);
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} else
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spin_unlock(&all_mddevs_lock);
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}
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static mddev_t * mddev_find(dev_t unit)
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{
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mddev_t *mddev, *new = NULL;
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retry:
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spin_lock(&all_mddevs_lock);
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list_for_each_entry(mddev, &all_mddevs, all_mddevs)
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if (mddev->unit == unit) {
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mddev_get(mddev);
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spin_unlock(&all_mddevs_lock);
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kfree(new);
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return mddev;
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}
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if (new) {
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list_add(&new->all_mddevs, &all_mddevs);
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spin_unlock(&all_mddevs_lock);
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return new;
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}
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spin_unlock(&all_mddevs_lock);
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new = kzalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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return NULL;
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new->unit = unit;
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if (MAJOR(unit) == MD_MAJOR)
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new->md_minor = MINOR(unit);
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else
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new->md_minor = MINOR(unit) >> MdpMinorShift;
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mutex_init(&new->reconfig_mutex);
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INIT_LIST_HEAD(&new->disks);
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INIT_LIST_HEAD(&new->all_mddevs);
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init_timer(&new->safemode_timer);
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atomic_set(&new->active, 1);
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spin_lock_init(&new->write_lock);
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init_waitqueue_head(&new->sb_wait);
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new->reshape_position = MaxSector;
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new->queue = blk_alloc_queue(GFP_KERNEL);
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if (!new->queue) {
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kfree(new);
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return NULL;
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}
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set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
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blk_queue_make_request(new->queue, md_fail_request);
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goto retry;
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}
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static inline int mddev_lock(mddev_t * mddev)
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{
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return mutex_lock_interruptible(&mddev->reconfig_mutex);
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}
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static inline int mddev_trylock(mddev_t * mddev)
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{
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return mutex_trylock(&mddev->reconfig_mutex);
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}
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static inline void mddev_unlock(mddev_t * mddev)
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{
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mutex_unlock(&mddev->reconfig_mutex);
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md_wakeup_thread(mddev->thread);
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}
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static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
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{
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mdk_rdev_t * rdev;
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struct list_head *tmp;
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ITERATE_RDEV(mddev,rdev,tmp) {
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if (rdev->desc_nr == nr)
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return rdev;
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}
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return NULL;
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}
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static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
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{
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struct list_head *tmp;
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mdk_rdev_t *rdev;
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ITERATE_RDEV(mddev,rdev,tmp) {
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if (rdev->bdev->bd_dev == dev)
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return rdev;
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}
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return NULL;
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}
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static struct mdk_personality *find_pers(int level, char *clevel)
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{
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struct mdk_personality *pers;
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list_for_each_entry(pers, &pers_list, list) {
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if (level != LEVEL_NONE && pers->level == level)
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return pers;
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if (strcmp(pers->name, clevel)==0)
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return pers;
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}
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return NULL;
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}
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static inline sector_t calc_dev_sboffset(struct block_device *bdev)
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{
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sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
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return MD_NEW_SIZE_BLOCKS(size);
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}
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static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
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{
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sector_t size;
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size = rdev->sb_offset;
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if (chunk_size)
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size &= ~((sector_t)chunk_size/1024 - 1);
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return size;
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}
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static int alloc_disk_sb(mdk_rdev_t * rdev)
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{
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if (rdev->sb_page)
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MD_BUG();
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rdev->sb_page = alloc_page(GFP_KERNEL);
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if (!rdev->sb_page) {
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printk(KERN_ALERT "md: out of memory.\n");
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return -EINVAL;
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}
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return 0;
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}
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static void free_disk_sb(mdk_rdev_t * rdev)
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{
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if (rdev->sb_page) {
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put_page(rdev->sb_page);
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rdev->sb_loaded = 0;
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rdev->sb_page = NULL;
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rdev->sb_offset = 0;
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rdev->size = 0;
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}
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}
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static int super_written(struct bio *bio, unsigned int bytes_done, int error)
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{
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mdk_rdev_t *rdev = bio->bi_private;
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mddev_t *mddev = rdev->mddev;
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if (bio->bi_size)
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return 1;
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if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
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printk("md: super_written gets error=%d, uptodate=%d\n",
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error, test_bit(BIO_UPTODATE, &bio->bi_flags));
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WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
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md_error(mddev, rdev);
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}
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if (atomic_dec_and_test(&mddev->pending_writes))
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wake_up(&mddev->sb_wait);
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bio_put(bio);
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return 0;
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}
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static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
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{
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struct bio *bio2 = bio->bi_private;
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mdk_rdev_t *rdev = bio2->bi_private;
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mddev_t *mddev = rdev->mddev;
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if (bio->bi_size)
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return 1;
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if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
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error == -EOPNOTSUPP) {
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unsigned long flags;
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/* barriers don't appear to be supported :-( */
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set_bit(BarriersNotsupp, &rdev->flags);
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mddev->barriers_work = 0;
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spin_lock_irqsave(&mddev->write_lock, flags);
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bio2->bi_next = mddev->biolist;
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mddev->biolist = bio2;
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spin_unlock_irqrestore(&mddev->write_lock, flags);
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wake_up(&mddev->sb_wait);
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bio_put(bio);
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return 0;
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}
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bio_put(bio2);
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bio->bi_private = rdev;
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return super_written(bio, bytes_done, error);
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}
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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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{
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/* write first size bytes of page to sector of rdev
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* Increment mddev->pending_writes before returning
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* and decrement it on completion, waking up sb_wait
|
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* if zero is reached.
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* If an error occurred, call md_error
|
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*
|
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* As we might need to resubmit the request if BIO_RW_BARRIER
|
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* causes ENOTSUPP, we allocate a spare bio...
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*/
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struct bio *bio = bio_alloc(GFP_NOIO, 1);
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int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
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|
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bio->bi_bdev = rdev->bdev;
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bio->bi_sector = sector;
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bio_add_page(bio, page, size, 0);
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bio->bi_private = rdev;
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bio->bi_end_io = super_written;
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bio->bi_rw = rw;
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|
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atomic_inc(&mddev->pending_writes);
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if (!test_bit(BarriersNotsupp, &rdev->flags)) {
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struct bio *rbio;
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rw |= (1<<BIO_RW_BARRIER);
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rbio = bio_clone(bio, GFP_NOIO);
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rbio->bi_private = bio;
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rbio->bi_end_io = super_written_barrier;
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submit_bio(rw, rbio);
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} else
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submit_bio(rw, bio);
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}
|
|
|
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void md_super_wait(mddev_t *mddev)
|
|
{
|
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/* wait for all superblock writes that were scheduled to complete.
|
|
* if any had to be retried (due to BARRIER problems), retry them
|
|
*/
|
|
DEFINE_WAIT(wq);
|
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for(;;) {
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prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
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if (atomic_read(&mddev->pending_writes)==0)
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break;
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while (mddev->biolist) {
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struct bio *bio;
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spin_lock_irq(&mddev->write_lock);
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bio = mddev->biolist;
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mddev->biolist = bio->bi_next ;
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bio->bi_next = NULL;
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spin_unlock_irq(&mddev->write_lock);
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submit_bio(bio->bi_rw, bio);
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}
|
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schedule();
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}
|
|
finish_wait(&mddev->sb_wait, &wq);
|
|
}
|
|
|
|
static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
|
|
{
|
|
if (bio->bi_size)
|
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return 1;
|
|
|
|
complete((struct completion*)bio->bi_private);
|
|
return 0;
|
|
}
|
|
|
|
int sync_page_io(struct block_device *bdev, sector_t sector, int size,
|
|
struct page *page, int rw)
|
|
{
|
|
struct bio *bio = bio_alloc(GFP_NOIO, 1);
|
|
struct completion event;
|
|
int ret;
|
|
|
|
rw |= (1 << BIO_RW_SYNC);
|
|
|
|
bio->bi_bdev = bdev;
|
|
bio->bi_sector = sector;
|
|
bio_add_page(bio, page, size, 0);
|
|
init_completion(&event);
|
|
bio->bi_private = &event;
|
|
bio->bi_end_io = bi_complete;
|
|
submit_bio(rw, bio);
|
|
wait_for_completion(&event);
|
|
|
|
ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
|
bio_put(bio);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sync_page_io);
|
|
|
|
static int read_disk_sb(mdk_rdev_t * rdev, int size)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
if (!rdev->sb_page) {
|
|
MD_BUG();
|
|
return -EINVAL;
|
|
}
|
|
if (rdev->sb_loaded)
|
|
return 0;
|
|
|
|
|
|
if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
|
|
goto fail;
|
|
rdev->sb_loaded = 1;
|
|
return 0;
|
|
|
|
fail:
|
|
printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
|
|
bdevname(rdev->bdev,b));
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
|
|
{
|
|
if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
|
|
(sb1->set_uuid1 == sb2->set_uuid1) &&
|
|
(sb1->set_uuid2 == sb2->set_uuid2) &&
|
|
(sb1->set_uuid3 == sb2->set_uuid3))
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
|
|
{
|
|
int ret;
|
|
mdp_super_t *tmp1, *tmp2;
|
|
|
|
tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
|
|
tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
|
|
|
|
if (!tmp1 || !tmp2) {
|
|
ret = 0;
|
|
printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
|
|
goto abort;
|
|
}
|
|
|
|
*tmp1 = *sb1;
|
|
*tmp2 = *sb2;
|
|
|
|
/*
|
|
* nr_disks is not constant
|
|
*/
|
|
tmp1->nr_disks = 0;
|
|
tmp2->nr_disks = 0;
|
|
|
|
if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
|
|
ret = 0;
|
|
else
|
|
ret = 1;
|
|
|
|
abort:
|
|
kfree(tmp1);
|
|
kfree(tmp2);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static u32 md_csum_fold(u32 csum)
|
|
{
|
|
csum = (csum & 0xffff) + (csum >> 16);
|
|
return (csum & 0xffff) + (csum >> 16);
|
|
}
|
|
|
|
static unsigned int calc_sb_csum(mdp_super_t * sb)
|
|
{
|
|
u64 newcsum = 0;
|
|
u32 *sb32 = (u32*)sb;
|
|
int i;
|
|
unsigned int disk_csum, csum;
|
|
|
|
disk_csum = sb->sb_csum;
|
|
sb->sb_csum = 0;
|
|
|
|
for (i = 0; i < MD_SB_BYTES/4 ; i++)
|
|
newcsum += sb32[i];
|
|
csum = (newcsum & 0xffffffff) + (newcsum>>32);
|
|
|
|
|
|
#ifdef CONFIG_ALPHA
|
|
/* This used to use csum_partial, which was wrong for several
|
|
* reasons including that different results are returned on
|
|
* different architectures. It isn't critical that we get exactly
|
|
* the same return value as before (we always csum_fold before
|
|
* testing, and that removes any differences). However as we
|
|
* know that csum_partial always returned a 16bit value on
|
|
* alphas, do a fold to maximise conformity to previous behaviour.
|
|
*/
|
|
sb->sb_csum = md_csum_fold(disk_csum);
|
|
#else
|
|
sb->sb_csum = disk_csum;
|
|
#endif
|
|
return csum;
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle superblock details.
|
|
* We want to be able to handle multiple superblock formats
|
|
* so we have a common interface to them all, and an array of
|
|
* different handlers.
|
|
* We rely on user-space to write the initial superblock, and support
|
|
* reading and updating of superblocks.
|
|
* Interface methods are:
|
|
* int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
|
|
* loads and validates a superblock on dev.
|
|
* if refdev != NULL, compare superblocks on both devices
|
|
* Return:
|
|
* 0 - dev has a superblock that is compatible with refdev
|
|
* 1 - dev has a superblock that is compatible and newer than refdev
|
|
* so dev should be used as the refdev in future
|
|
* -EINVAL superblock incompatible or invalid
|
|
* -othererror e.g. -EIO
|
|
*
|
|
* int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
|
|
* Verify that dev is acceptable into mddev.
|
|
* The first time, mddev->raid_disks will be 0, and data from
|
|
* dev should be merged in. Subsequent calls check that dev
|
|
* is new enough. Return 0 or -EINVAL
|
|
*
|
|
* void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
|
|
* Update the superblock for rdev with data in mddev
|
|
* This does not write to disc.
|
|
*
|
|
*/
|
|
|
|
struct super_type {
|
|
char *name;
|
|
struct module *owner;
|
|
int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
|
|
int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
|
|
void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
|
|
};
|
|
|
|
/*
|
|
* load_super for 0.90.0
|
|
*/
|
|
static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
|
|
{
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
mdp_super_t *sb;
|
|
int ret;
|
|
sector_t sb_offset;
|
|
|
|
/*
|
|
* Calculate the position of the superblock,
|
|
* it's at the end of the disk.
|
|
*
|
|
* It also happens to be a multiple of 4Kb.
|
|
*/
|
|
sb_offset = calc_dev_sboffset(rdev->bdev);
|
|
rdev->sb_offset = sb_offset;
|
|
|
|
ret = read_disk_sb(rdev, MD_SB_BYTES);
|
|
if (ret) return ret;
|
|
|
|
ret = -EINVAL;
|
|
|
|
bdevname(rdev->bdev, b);
|
|
sb = (mdp_super_t*)page_address(rdev->sb_page);
|
|
|
|
if (sb->md_magic != MD_SB_MAGIC) {
|
|
printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
|
|
b);
|
|
goto abort;
|
|
}
|
|
|
|
if (sb->major_version != 0 ||
|
|
sb->minor_version < 90 ||
|
|
sb->minor_version > 91) {
|
|
printk(KERN_WARNING "Bad version number %d.%d on %s\n",
|
|
sb->major_version, sb->minor_version,
|
|
b);
|
|
goto abort;
|
|
}
|
|
|
|
if (sb->raid_disks <= 0)
|
|
goto abort;
|
|
|
|
if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
|
|
printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
|
|
b);
|
|
goto abort;
|
|
}
|
|
|
|
rdev->preferred_minor = sb->md_minor;
|
|
rdev->data_offset = 0;
|
|
rdev->sb_size = MD_SB_BYTES;
|
|
|
|
if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
|
|
if (sb->level != 1 && sb->level != 4
|
|
&& sb->level != 5 && sb->level != 6
|
|
&& sb->level != 10) {
|
|
/* FIXME use a better test */
|
|
printk(KERN_WARNING
|
|
"md: bitmaps not supported for this level.\n");
|
|
goto abort;
|
|
}
|
|
}
|
|
|
|
if (sb->level == LEVEL_MULTIPATH)
|
|
rdev->desc_nr = -1;
|
|
else
|
|
rdev->desc_nr = sb->this_disk.number;
|
|
|
|
if (refdev == 0)
|
|
ret = 1;
|
|
else {
|
|
__u64 ev1, ev2;
|
|
mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
|
|
if (!uuid_equal(refsb, sb)) {
|
|
printk(KERN_WARNING "md: %s has different UUID to %s\n",
|
|
b, bdevname(refdev->bdev,b2));
|
|
goto abort;
|
|
}
|
|
if (!sb_equal(refsb, sb)) {
|
|
printk(KERN_WARNING "md: %s has same UUID"
|
|
" but different superblock to %s\n",
|
|
b, bdevname(refdev->bdev, b2));
|
|
goto abort;
|
|
}
|
|
ev1 = md_event(sb);
|
|
ev2 = md_event(refsb);
|
|
if (ev1 > ev2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
}
|
|
rdev->size = calc_dev_size(rdev, sb->chunk_size);
|
|
|
|
if (rdev->size < sb->size && sb->level > 1)
|
|
/* "this cannot possibly happen" ... */
|
|
ret = -EINVAL;
|
|
|
|
abort:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* validate_super for 0.90.0
|
|
*/
|
|
static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
mdp_disk_t *desc;
|
|
mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
|
|
__u64 ev1 = md_event(sb);
|
|
|
|
rdev->raid_disk = -1;
|
|
rdev->flags = 0;
|
|
if (mddev->raid_disks == 0) {
|
|
mddev->major_version = 0;
|
|
mddev->minor_version = sb->minor_version;
|
|
mddev->patch_version = sb->patch_version;
|
|
mddev->persistent = ! sb->not_persistent;
|
|
mddev->chunk_size = sb->chunk_size;
|
|
mddev->ctime = sb->ctime;
|
|
mddev->utime = sb->utime;
|
|
mddev->level = sb->level;
|
|
mddev->clevel[0] = 0;
|
|
mddev->layout = sb->layout;
|
|
mddev->raid_disks = sb->raid_disks;
|
|
mddev->size = sb->size;
|
|
mddev->events = ev1;
|
|
mddev->bitmap_offset = 0;
|
|
mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
|
|
|
|
if (mddev->minor_version >= 91) {
|
|
mddev->reshape_position = sb->reshape_position;
|
|
mddev->delta_disks = sb->delta_disks;
|
|
mddev->new_level = sb->new_level;
|
|
mddev->new_layout = sb->new_layout;
|
|
mddev->new_chunk = sb->new_chunk;
|
|
} else {
|
|
mddev->reshape_position = MaxSector;
|
|
mddev->delta_disks = 0;
|
|
mddev->new_level = mddev->level;
|
|
mddev->new_layout = mddev->layout;
|
|
mddev->new_chunk = mddev->chunk_size;
|
|
}
|
|
|
|
if (sb->state & (1<<MD_SB_CLEAN))
|
|
mddev->recovery_cp = MaxSector;
|
|
else {
|
|
if (sb->events_hi == sb->cp_events_hi &&
|
|
sb->events_lo == sb->cp_events_lo) {
|
|
mddev->recovery_cp = sb->recovery_cp;
|
|
} else
|
|
mddev->recovery_cp = 0;
|
|
}
|
|
|
|
memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
|
|
memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
|
|
memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
|
|
memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
|
|
|
|
mddev->max_disks = MD_SB_DISKS;
|
|
|
|
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
|
|
mddev->bitmap_file == NULL)
|
|
mddev->bitmap_offset = mddev->default_bitmap_offset;
|
|
|
|
} else if (mddev->pers == NULL) {
|
|
/* Insist on good event counter while assembling */
|
|
++ev1;
|
|
if (ev1 < mddev->events)
|
|
return -EINVAL;
|
|
} else if (mddev->bitmap) {
|
|
/* if adding to array with a bitmap, then we can accept an
|
|
* older device ... but not too old.
|
|
*/
|
|
if (ev1 < mddev->bitmap->events_cleared)
|
|
return 0;
|
|
} else {
|
|
if (ev1 < mddev->events)
|
|
/* just a hot-add of a new device, leave raid_disk at -1 */
|
|
return 0;
|
|
}
|
|
|
|
if (mddev->level != LEVEL_MULTIPATH) {
|
|
desc = sb->disks + rdev->desc_nr;
|
|
|
|
if (desc->state & (1<<MD_DISK_FAULTY))
|
|
set_bit(Faulty, &rdev->flags);
|
|
else if (desc->state & (1<<MD_DISK_SYNC) /* &&
|
|
desc->raid_disk < mddev->raid_disks */) {
|
|
set_bit(In_sync, &rdev->flags);
|
|
rdev->raid_disk = desc->raid_disk;
|
|
}
|
|
if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
|
|
set_bit(WriteMostly, &rdev->flags);
|
|
} else /* MULTIPATH are always insync */
|
|
set_bit(In_sync, &rdev->flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* sync_super for 0.90.0
|
|
*/
|
|
static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
mdp_super_t *sb;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev2;
|
|
int next_spare = mddev->raid_disks;
|
|
|
|
|
|
/* make rdev->sb match mddev data..
|
|
*
|
|
* 1/ zero out disks
|
|
* 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
|
|
* 3/ any empty disks < next_spare become removed
|
|
*
|
|
* disks[0] gets initialised to REMOVED because
|
|
* we cannot be sure from other fields if it has
|
|
* been initialised or not.
|
|
*/
|
|
int i;
|
|
int active=0, working=0,failed=0,spare=0,nr_disks=0;
|
|
|
|
rdev->sb_size = MD_SB_BYTES;
|
|
|
|
sb = (mdp_super_t*)page_address(rdev->sb_page);
|
|
|
|
memset(sb, 0, sizeof(*sb));
|
|
|
|
sb->md_magic = MD_SB_MAGIC;
|
|
sb->major_version = mddev->major_version;
|
|
sb->patch_version = mddev->patch_version;
|
|
sb->gvalid_words = 0; /* ignored */
|
|
memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
|
|
memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
|
|
memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
|
|
memcpy(&sb->set_uuid3, mddev->uuid+12,4);
|
|
|
|
sb->ctime = mddev->ctime;
|
|
sb->level = mddev->level;
|
|
sb->size = mddev->size;
|
|
sb->raid_disks = mddev->raid_disks;
|
|
sb->md_minor = mddev->md_minor;
|
|
sb->not_persistent = !mddev->persistent;
|
|
sb->utime = mddev->utime;
|
|
sb->state = 0;
|
|
sb->events_hi = (mddev->events>>32);
|
|
sb->events_lo = (u32)mddev->events;
|
|
|
|
if (mddev->reshape_position == MaxSector)
|
|
sb->minor_version = 90;
|
|
else {
|
|
sb->minor_version = 91;
|
|
sb->reshape_position = mddev->reshape_position;
|
|
sb->new_level = mddev->new_level;
|
|
sb->delta_disks = mddev->delta_disks;
|
|
sb->new_layout = mddev->new_layout;
|
|
sb->new_chunk = mddev->new_chunk;
|
|
}
|
|
mddev->minor_version = sb->minor_version;
|
|
if (mddev->in_sync)
|
|
{
|
|
sb->recovery_cp = mddev->recovery_cp;
|
|
sb->cp_events_hi = (mddev->events>>32);
|
|
sb->cp_events_lo = (u32)mddev->events;
|
|
if (mddev->recovery_cp == MaxSector)
|
|
sb->state = (1<< MD_SB_CLEAN);
|
|
} else
|
|
sb->recovery_cp = 0;
|
|
|
|
sb->layout = mddev->layout;
|
|
sb->chunk_size = mddev->chunk_size;
|
|
|
|
if (mddev->bitmap && mddev->bitmap_file == NULL)
|
|
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
|
|
|
|
sb->disks[0].state = (1<<MD_DISK_REMOVED);
|
|
ITERATE_RDEV(mddev,rdev2,tmp) {
|
|
mdp_disk_t *d;
|
|
int desc_nr;
|
|
if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
|
|
&& !test_bit(Faulty, &rdev2->flags))
|
|
desc_nr = rdev2->raid_disk;
|
|
else
|
|
desc_nr = next_spare++;
|
|
rdev2->desc_nr = desc_nr;
|
|
d = &sb->disks[rdev2->desc_nr];
|
|
nr_disks++;
|
|
d->number = rdev2->desc_nr;
|
|
d->major = MAJOR(rdev2->bdev->bd_dev);
|
|
d->minor = MINOR(rdev2->bdev->bd_dev);
|
|
if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
|
|
&& !test_bit(Faulty, &rdev2->flags))
|
|
d->raid_disk = rdev2->raid_disk;
|
|
else
|
|
d->raid_disk = rdev2->desc_nr; /* compatibility */
|
|
if (test_bit(Faulty, &rdev2->flags))
|
|
d->state = (1<<MD_DISK_FAULTY);
|
|
else if (test_bit(In_sync, &rdev2->flags)) {
|
|
d->state = (1<<MD_DISK_ACTIVE);
|
|
d->state |= (1<<MD_DISK_SYNC);
|
|
active++;
|
|
working++;
|
|
} else {
|
|
d->state = 0;
|
|
spare++;
|
|
working++;
|
|
}
|
|
if (test_bit(WriteMostly, &rdev2->flags))
|
|
d->state |= (1<<MD_DISK_WRITEMOSTLY);
|
|
}
|
|
/* now set the "removed" and "faulty" bits on any missing devices */
|
|
for (i=0 ; i < mddev->raid_disks ; i++) {
|
|
mdp_disk_t *d = &sb->disks[i];
|
|
if (d->state == 0 && d->number == 0) {
|
|
d->number = i;
|
|
d->raid_disk = i;
|
|
d->state = (1<<MD_DISK_REMOVED);
|
|
d->state |= (1<<MD_DISK_FAULTY);
|
|
failed++;
|
|
}
|
|
}
|
|
sb->nr_disks = nr_disks;
|
|
sb->active_disks = active;
|
|
sb->working_disks = working;
|
|
sb->failed_disks = failed;
|
|
sb->spare_disks = spare;
|
|
|
|
sb->this_disk = sb->disks[rdev->desc_nr];
|
|
sb->sb_csum = calc_sb_csum(sb);
|
|
}
|
|
|
|
/*
|
|
* version 1 superblock
|
|
*/
|
|
|
|
static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
|
|
{
|
|
__le32 disk_csum;
|
|
u32 csum;
|
|
unsigned long long newcsum;
|
|
int size = 256 + le32_to_cpu(sb->max_dev)*2;
|
|
__le32 *isuper = (__le32*)sb;
|
|
int i;
|
|
|
|
disk_csum = sb->sb_csum;
|
|
sb->sb_csum = 0;
|
|
newcsum = 0;
|
|
for (i=0; size>=4; size -= 4 )
|
|
newcsum += le32_to_cpu(*isuper++);
|
|
|
|
if (size == 2)
|
|
newcsum += le16_to_cpu(*(__le16*) isuper);
|
|
|
|
csum = (newcsum & 0xffffffff) + (newcsum >> 32);
|
|
sb->sb_csum = disk_csum;
|
|
return cpu_to_le32(csum);
|
|
}
|
|
|
|
static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
|
|
{
|
|
struct mdp_superblock_1 *sb;
|
|
int ret;
|
|
sector_t sb_offset;
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
int bmask;
|
|
|
|
/*
|
|
* Calculate the position of the superblock.
|
|
* It is always aligned to a 4K boundary and
|
|
* depeding on minor_version, it can be:
|
|
* 0: At least 8K, but less than 12K, from end of device
|
|
* 1: At start of device
|
|
* 2: 4K from start of device.
|
|
*/
|
|
switch(minor_version) {
|
|
case 0:
|
|
sb_offset = rdev->bdev->bd_inode->i_size >> 9;
|
|
sb_offset -= 8*2;
|
|
sb_offset &= ~(sector_t)(4*2-1);
|
|
/* convert from sectors to K */
|
|
sb_offset /= 2;
|
|
break;
|
|
case 1:
|
|
sb_offset = 0;
|
|
break;
|
|
case 2:
|
|
sb_offset = 4;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
rdev->sb_offset = sb_offset;
|
|
|
|
/* superblock is rarely larger than 1K, but it can be larger,
|
|
* and it is safe to read 4k, so we do that
|
|
*/
|
|
ret = read_disk_sb(rdev, 4096);
|
|
if (ret) return ret;
|
|
|
|
|
|
sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
|
|
if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
|
|
sb->major_version != cpu_to_le32(1) ||
|
|
le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
|
|
le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
|
|
(le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
|
|
return -EINVAL;
|
|
|
|
if (calc_sb_1_csum(sb) != sb->sb_csum) {
|
|
printk("md: invalid superblock checksum on %s\n",
|
|
bdevname(rdev->bdev,b));
|
|
return -EINVAL;
|
|
}
|
|
if (le64_to_cpu(sb->data_size) < 10) {
|
|
printk("md: data_size too small on %s\n",
|
|
bdevname(rdev->bdev,b));
|
|
return -EINVAL;
|
|
}
|
|
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
|
|
if (sb->level != cpu_to_le32(1) &&
|
|
sb->level != cpu_to_le32(4) &&
|
|
sb->level != cpu_to_le32(5) &&
|
|
sb->level != cpu_to_le32(6) &&
|
|
sb->level != cpu_to_le32(10)) {
|
|
printk(KERN_WARNING
|
|
"md: bitmaps not supported for this level.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
rdev->preferred_minor = 0xffff;
|
|
rdev->data_offset = le64_to_cpu(sb->data_offset);
|
|
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
|
|
|
|
rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
|
|
bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
|
|
if (rdev->sb_size & bmask)
|
|
rdev-> sb_size = (rdev->sb_size | bmask)+1;
|
|
|
|
if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
|
|
rdev->desc_nr = -1;
|
|
else
|
|
rdev->desc_nr = le32_to_cpu(sb->dev_number);
|
|
|
|
if (refdev == 0)
|
|
ret = 1;
|
|
else {
|
|
__u64 ev1, ev2;
|
|
struct mdp_superblock_1 *refsb =
|
|
(struct mdp_superblock_1*)page_address(refdev->sb_page);
|
|
|
|
if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
|
|
sb->level != refsb->level ||
|
|
sb->layout != refsb->layout ||
|
|
sb->chunksize != refsb->chunksize) {
|
|
printk(KERN_WARNING "md: %s has strangely different"
|
|
" superblock to %s\n",
|
|
bdevname(rdev->bdev,b),
|
|
bdevname(refdev->bdev,b2));
|
|
return -EINVAL;
|
|
}
|
|
ev1 = le64_to_cpu(sb->events);
|
|
ev2 = le64_to_cpu(refsb->events);
|
|
|
|
if (ev1 > ev2)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
}
|
|
if (minor_version)
|
|
rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
|
|
else
|
|
rdev->size = rdev->sb_offset;
|
|
if (rdev->size < le64_to_cpu(sb->data_size)/2)
|
|
return -EINVAL;
|
|
rdev->size = le64_to_cpu(sb->data_size)/2;
|
|
if (le32_to_cpu(sb->chunksize))
|
|
rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
|
|
|
|
if (le64_to_cpu(sb->size) > rdev->size*2)
|
|
return -EINVAL;
|
|
return ret;
|
|
}
|
|
|
|
static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
__u64 ev1 = le64_to_cpu(sb->events);
|
|
|
|
rdev->raid_disk = -1;
|
|
rdev->flags = 0;
|
|
if (mddev->raid_disks == 0) {
|
|
mddev->major_version = 1;
|
|
mddev->patch_version = 0;
|
|
mddev->persistent = 1;
|
|
mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
|
|
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
|
|
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
|
|
mddev->level = le32_to_cpu(sb->level);
|
|
mddev->clevel[0] = 0;
|
|
mddev->layout = le32_to_cpu(sb->layout);
|
|
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
|
|
mddev->size = le64_to_cpu(sb->size)/2;
|
|
mddev->events = ev1;
|
|
mddev->bitmap_offset = 0;
|
|
mddev->default_bitmap_offset = 1024 >> 9;
|
|
|
|
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
|
|
memcpy(mddev->uuid, sb->set_uuid, 16);
|
|
|
|
mddev->max_disks = (4096-256)/2;
|
|
|
|
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
|
|
mddev->bitmap_file == NULL )
|
|
mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
|
|
|
|
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
|
|
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
|
|
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
|
|
mddev->new_level = le32_to_cpu(sb->new_level);
|
|
mddev->new_layout = le32_to_cpu(sb->new_layout);
|
|
mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
|
|
} else {
|
|
mddev->reshape_position = MaxSector;
|
|
mddev->delta_disks = 0;
|
|
mddev->new_level = mddev->level;
|
|
mddev->new_layout = mddev->layout;
|
|
mddev->new_chunk = mddev->chunk_size;
|
|
}
|
|
|
|
} else if (mddev->pers == NULL) {
|
|
/* Insist of good event counter while assembling */
|
|
++ev1;
|
|
if (ev1 < mddev->events)
|
|
return -EINVAL;
|
|
} else if (mddev->bitmap) {
|
|
/* If adding to array with a bitmap, then we can accept an
|
|
* older device, but not too old.
|
|
*/
|
|
if (ev1 < mddev->bitmap->events_cleared)
|
|
return 0;
|
|
} else {
|
|
if (ev1 < mddev->events)
|
|
/* just a hot-add of a new device, leave raid_disk at -1 */
|
|
return 0;
|
|
}
|
|
if (mddev->level != LEVEL_MULTIPATH) {
|
|
int role;
|
|
role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
|
|
switch(role) {
|
|
case 0xffff: /* spare */
|
|
break;
|
|
case 0xfffe: /* faulty */
|
|
set_bit(Faulty, &rdev->flags);
|
|
break;
|
|
default:
|
|
if ((le32_to_cpu(sb->feature_map) &
|
|
MD_FEATURE_RECOVERY_OFFSET))
|
|
rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
|
|
else
|
|
set_bit(In_sync, &rdev->flags);
|
|
rdev->raid_disk = role;
|
|
break;
|
|
}
|
|
if (sb->devflags & WriteMostly1)
|
|
set_bit(WriteMostly, &rdev->flags);
|
|
} else /* MULTIPATH are always insync */
|
|
set_bit(In_sync, &rdev->flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
struct mdp_superblock_1 *sb;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev2;
|
|
int max_dev, i;
|
|
/* make rdev->sb match mddev and rdev data. */
|
|
|
|
sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
|
|
|
|
sb->feature_map = 0;
|
|
sb->pad0 = 0;
|
|
sb->recovery_offset = cpu_to_le64(0);
|
|
memset(sb->pad1, 0, sizeof(sb->pad1));
|
|
memset(sb->pad2, 0, sizeof(sb->pad2));
|
|
memset(sb->pad3, 0, sizeof(sb->pad3));
|
|
|
|
sb->utime = cpu_to_le64((__u64)mddev->utime);
|
|
sb->events = cpu_to_le64(mddev->events);
|
|
if (mddev->in_sync)
|
|
sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
|
|
else
|
|
sb->resync_offset = cpu_to_le64(0);
|
|
|
|
sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
|
|
|
|
sb->raid_disks = cpu_to_le32(mddev->raid_disks);
|
|
sb->size = cpu_to_le64(mddev->size<<1);
|
|
|
|
if (mddev->bitmap && mddev->bitmap_file == NULL) {
|
|
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
|
|
sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
|
|
}
|
|
|
|
if (rdev->raid_disk >= 0 &&
|
|
!test_bit(In_sync, &rdev->flags) &&
|
|
rdev->recovery_offset > 0) {
|
|
sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
|
|
sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
|
|
}
|
|
|
|
if (mddev->reshape_position != MaxSector) {
|
|
sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
|
|
sb->reshape_position = cpu_to_le64(mddev->reshape_position);
|
|
sb->new_layout = cpu_to_le32(mddev->new_layout);
|
|
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
|
|
sb->new_level = cpu_to_le32(mddev->new_level);
|
|
sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
|
|
}
|
|
|
|
max_dev = 0;
|
|
ITERATE_RDEV(mddev,rdev2,tmp)
|
|
if (rdev2->desc_nr+1 > max_dev)
|
|
max_dev = rdev2->desc_nr+1;
|
|
|
|
if (max_dev > le32_to_cpu(sb->max_dev))
|
|
sb->max_dev = cpu_to_le32(max_dev);
|
|
for (i=0; i<max_dev;i++)
|
|
sb->dev_roles[i] = cpu_to_le16(0xfffe);
|
|
|
|
ITERATE_RDEV(mddev,rdev2,tmp) {
|
|
i = rdev2->desc_nr;
|
|
if (test_bit(Faulty, &rdev2->flags))
|
|
sb->dev_roles[i] = cpu_to_le16(0xfffe);
|
|
else if (test_bit(In_sync, &rdev2->flags))
|
|
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
|
|
else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
|
|
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
|
|
else
|
|
sb->dev_roles[i] = cpu_to_le16(0xffff);
|
|
}
|
|
|
|
sb->sb_csum = calc_sb_1_csum(sb);
|
|
}
|
|
|
|
|
|
static struct super_type super_types[] = {
|
|
[0] = {
|
|
.name = "0.90.0",
|
|
.owner = THIS_MODULE,
|
|
.load_super = super_90_load,
|
|
.validate_super = super_90_validate,
|
|
.sync_super = super_90_sync,
|
|
},
|
|
[1] = {
|
|
.name = "md-1",
|
|
.owner = THIS_MODULE,
|
|
.load_super = super_1_load,
|
|
.validate_super = super_1_validate,
|
|
.sync_super = super_1_sync,
|
|
},
|
|
};
|
|
|
|
static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
|
|
{
|
|
struct list_head *tmp, *tmp2;
|
|
mdk_rdev_t *rdev, *rdev2;
|
|
|
|
ITERATE_RDEV(mddev1,rdev,tmp)
|
|
ITERATE_RDEV(mddev2, rdev2, tmp2)
|
|
if (rdev->bdev->bd_contains ==
|
|
rdev2->bdev->bd_contains)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static LIST_HEAD(pending_raid_disks);
|
|
|
|
static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
struct kobject *ko;
|
|
char *s;
|
|
int err;
|
|
|
|
if (rdev->mddev) {
|
|
MD_BUG();
|
|
return -EINVAL;
|
|
}
|
|
/* make sure rdev->size exceeds mddev->size */
|
|
if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
|
|
if (mddev->pers) {
|
|
/* Cannot change size, so fail
|
|
* If mddev->level <= 0, then we don't care
|
|
* about aligning sizes (e.g. linear)
|
|
*/
|
|
if (mddev->level > 0)
|
|
return -ENOSPC;
|
|
} else
|
|
mddev->size = rdev->size;
|
|
}
|
|
|
|
/* Verify rdev->desc_nr is unique.
|
|
* If it is -1, assign a free number, else
|
|
* check number is not in use
|
|
*/
|
|
if (rdev->desc_nr < 0) {
|
|
int choice = 0;
|
|
if (mddev->pers) choice = mddev->raid_disks;
|
|
while (find_rdev_nr(mddev, choice))
|
|
choice++;
|
|
rdev->desc_nr = choice;
|
|
} else {
|
|
if (find_rdev_nr(mddev, rdev->desc_nr))
|
|
return -EBUSY;
|
|
}
|
|
bdevname(rdev->bdev,b);
|
|
if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
|
|
return -ENOMEM;
|
|
while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
|
|
*s = '!';
|
|
|
|
rdev->mddev = mddev;
|
|
printk(KERN_INFO "md: bind<%s>\n", b);
|
|
|
|
rdev->kobj.parent = &mddev->kobj;
|
|
if ((err = kobject_add(&rdev->kobj)))
|
|
goto fail;
|
|
|
|
if (rdev->bdev->bd_part)
|
|
ko = &rdev->bdev->bd_part->kobj;
|
|
else
|
|
ko = &rdev->bdev->bd_disk->kobj;
|
|
if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
|
|
kobject_del(&rdev->kobj);
|
|
goto fail;
|
|
}
|
|
list_add(&rdev->same_set, &mddev->disks);
|
|
bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
|
|
return 0;
|
|
|
|
fail:
|
|
printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
|
|
b, mdname(mddev));
|
|
return err;
|
|
}
|
|
|
|
static void delayed_delete(struct work_struct *ws)
|
|
{
|
|
mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
|
|
kobject_del(&rdev->kobj);
|
|
}
|
|
|
|
static void unbind_rdev_from_array(mdk_rdev_t * rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
if (!rdev->mddev) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
|
|
list_del_init(&rdev->same_set);
|
|
printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
|
|
rdev->mddev = NULL;
|
|
sysfs_remove_link(&rdev->kobj, "block");
|
|
|
|
/* We need to delay this, otherwise we can deadlock when
|
|
* writing to 'remove' to "dev/state"
|
|
*/
|
|
INIT_WORK(&rdev->del_work, delayed_delete);
|
|
schedule_work(&rdev->del_work);
|
|
}
|
|
|
|
/*
|
|
* prevent the device from being mounted, repartitioned or
|
|
* otherwise reused by a RAID array (or any other kernel
|
|
* subsystem), by bd_claiming the device.
|
|
*/
|
|
static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
|
|
{
|
|
int err = 0;
|
|
struct block_device *bdev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
|
|
if (IS_ERR(bdev)) {
|
|
printk(KERN_ERR "md: could not open %s.\n",
|
|
__bdevname(dev, b));
|
|
return PTR_ERR(bdev);
|
|
}
|
|
err = bd_claim(bdev, rdev);
|
|
if (err) {
|
|
printk(KERN_ERR "md: could not bd_claim %s.\n",
|
|
bdevname(bdev, b));
|
|
blkdev_put(bdev);
|
|
return err;
|
|
}
|
|
rdev->bdev = bdev;
|
|
return err;
|
|
}
|
|
|
|
static void unlock_rdev(mdk_rdev_t *rdev)
|
|
{
|
|
struct block_device *bdev = rdev->bdev;
|
|
rdev->bdev = NULL;
|
|
if (!bdev)
|
|
MD_BUG();
|
|
bd_release(bdev);
|
|
blkdev_put(bdev);
|
|
}
|
|
|
|
void md_autodetect_dev(dev_t dev);
|
|
|
|
static void export_rdev(mdk_rdev_t * rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
printk(KERN_INFO "md: export_rdev(%s)\n",
|
|
bdevname(rdev->bdev,b));
|
|
if (rdev->mddev)
|
|
MD_BUG();
|
|
free_disk_sb(rdev);
|
|
list_del_init(&rdev->same_set);
|
|
#ifndef MODULE
|
|
md_autodetect_dev(rdev->bdev->bd_dev);
|
|
#endif
|
|
unlock_rdev(rdev);
|
|
kobject_put(&rdev->kobj);
|
|
}
|
|
|
|
static void kick_rdev_from_array(mdk_rdev_t * rdev)
|
|
{
|
|
unbind_rdev_from_array(rdev);
|
|
export_rdev(rdev);
|
|
}
|
|
|
|
static void export_array(mddev_t *mddev)
|
|
{
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (!rdev->mddev) {
|
|
MD_BUG();
|
|
continue;
|
|
}
|
|
kick_rdev_from_array(rdev);
|
|
}
|
|
if (!list_empty(&mddev->disks))
|
|
MD_BUG();
|
|
mddev->raid_disks = 0;
|
|
mddev->major_version = 0;
|
|
}
|
|
|
|
static void print_desc(mdp_disk_t *desc)
|
|
{
|
|
printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
|
|
desc->major,desc->minor,desc->raid_disk,desc->state);
|
|
}
|
|
|
|
static void print_sb(mdp_super_t *sb)
|
|
{
|
|
int i;
|
|
|
|
printk(KERN_INFO
|
|
"md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
|
|
sb->major_version, sb->minor_version, sb->patch_version,
|
|
sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
|
|
sb->ctime);
|
|
printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
|
|
sb->level, sb->size, sb->nr_disks, sb->raid_disks,
|
|
sb->md_minor, sb->layout, sb->chunk_size);
|
|
printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
|
|
" FD:%d SD:%d CSUM:%08x E:%08lx\n",
|
|
sb->utime, sb->state, sb->active_disks, sb->working_disks,
|
|
sb->failed_disks, sb->spare_disks,
|
|
sb->sb_csum, (unsigned long)sb->events_lo);
|
|
|
|
printk(KERN_INFO);
|
|
for (i = 0; i < MD_SB_DISKS; i++) {
|
|
mdp_disk_t *desc;
|
|
|
|
desc = sb->disks + i;
|
|
if (desc->number || desc->major || desc->minor ||
|
|
desc->raid_disk || (desc->state && (desc->state != 4))) {
|
|
printk(" D %2d: ", i);
|
|
print_desc(desc);
|
|
}
|
|
}
|
|
printk(KERN_INFO "md: THIS: ");
|
|
print_desc(&sb->this_disk);
|
|
|
|
}
|
|
|
|
static void print_rdev(mdk_rdev_t *rdev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
|
|
bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
|
|
test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
|
|
rdev->desc_nr);
|
|
if (rdev->sb_loaded) {
|
|
printk(KERN_INFO "md: rdev superblock:\n");
|
|
print_sb((mdp_super_t*)page_address(rdev->sb_page));
|
|
} else
|
|
printk(KERN_INFO "md: no rdev superblock!\n");
|
|
}
|
|
|
|
static void md_print_devices(void)
|
|
{
|
|
struct list_head *tmp, *tmp2;
|
|
mdk_rdev_t *rdev;
|
|
mddev_t *mddev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
printk("\n");
|
|
printk("md: **********************************\n");
|
|
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
|
|
printk("md: **********************************\n");
|
|
ITERATE_MDDEV(mddev,tmp) {
|
|
|
|
if (mddev->bitmap)
|
|
bitmap_print_sb(mddev->bitmap);
|
|
else
|
|
printk("%s: ", mdname(mddev));
|
|
ITERATE_RDEV(mddev,rdev,tmp2)
|
|
printk("<%s>", bdevname(rdev->bdev,b));
|
|
printk("\n");
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp2)
|
|
print_rdev(rdev);
|
|
}
|
|
printk("md: **********************************\n");
|
|
printk("\n");
|
|
}
|
|
|
|
|
|
static void sync_sbs(mddev_t * mddev, int nospares)
|
|
{
|
|
/* Update each superblock (in-memory image), but
|
|
* if we are allowed to, skip spares which already
|
|
* have the right event counter, or have one earlier
|
|
* (which would mean they aren't being marked as dirty
|
|
* with the rest of the array)
|
|
*/
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (rdev->sb_events == mddev->events ||
|
|
(nospares &&
|
|
rdev->raid_disk < 0 &&
|
|
(rdev->sb_events&1)==0 &&
|
|
rdev->sb_events+1 == mddev->events)) {
|
|
/* Don't update this superblock */
|
|
rdev->sb_loaded = 2;
|
|
} else {
|
|
super_types[mddev->major_version].
|
|
sync_super(mddev, rdev);
|
|
rdev->sb_loaded = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void md_update_sb(mddev_t * mddev, int force_change)
|
|
{
|
|
int err;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
int sync_req;
|
|
int nospares = 0;
|
|
|
|
repeat:
|
|
spin_lock_irq(&mddev->write_lock);
|
|
|
|
set_bit(MD_CHANGE_PENDING, &mddev->flags);
|
|
if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
|
|
force_change = 1;
|
|
if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
|
|
/* just a clean<-> dirty transition, possibly leave spares alone,
|
|
* though if events isn't the right even/odd, we will have to do
|
|
* spares after all
|
|
*/
|
|
nospares = 1;
|
|
if (force_change)
|
|
nospares = 0;
|
|
if (mddev->degraded)
|
|
/* If the array is degraded, then skipping spares is both
|
|
* dangerous and fairly pointless.
|
|
* Dangerous because a device that was removed from the array
|
|
* might have a event_count that still looks up-to-date,
|
|
* so it can be re-added without a resync.
|
|
* Pointless because if there are any spares to skip,
|
|
* then a recovery will happen and soon that array won't
|
|
* be degraded any more and the spare can go back to sleep then.
|
|
*/
|
|
nospares = 0;
|
|
|
|
sync_req = mddev->in_sync;
|
|
mddev->utime = get_seconds();
|
|
|
|
/* If this is just a dirty<->clean transition, and the array is clean
|
|
* and 'events' is odd, we can roll back to the previous clean state */
|
|
if (nospares
|
|
&& (mddev->in_sync && mddev->recovery_cp == MaxSector)
|
|
&& (mddev->events & 1)
|
|
&& mddev->events != 1)
|
|
mddev->events--;
|
|
else {
|
|
/* otherwise we have to go forward and ... */
|
|
mddev->events ++;
|
|
if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
|
|
/* .. if the array isn't clean, insist on an odd 'events' */
|
|
if ((mddev->events&1)==0) {
|
|
mddev->events++;
|
|
nospares = 0;
|
|
}
|
|
} else {
|
|
/* otherwise insist on an even 'events' (for clean states) */
|
|
if ((mddev->events&1)) {
|
|
mddev->events++;
|
|
nospares = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!mddev->events) {
|
|
/*
|
|
* oops, this 64-bit counter should never wrap.
|
|
* Either we are in around ~1 trillion A.C., assuming
|
|
* 1 reboot per second, or we have a bug:
|
|
*/
|
|
MD_BUG();
|
|
mddev->events --;
|
|
}
|
|
sync_sbs(mddev, nospares);
|
|
|
|
/*
|
|
* do not write anything to disk if using
|
|
* nonpersistent superblocks
|
|
*/
|
|
if (!mddev->persistent) {
|
|
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
wake_up(&mddev->sb_wait);
|
|
return;
|
|
}
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
|
|
dprintk(KERN_INFO
|
|
"md: updating %s RAID superblock on device (in sync %d)\n",
|
|
mdname(mddev),mddev->in_sync);
|
|
|
|
err = bitmap_update_sb(mddev->bitmap);
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
dprintk(KERN_INFO "md: ");
|
|
if (rdev->sb_loaded != 1)
|
|
continue; /* no noise on spare devices */
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
dprintk("(skipping faulty ");
|
|
|
|
dprintk("%s ", bdevname(rdev->bdev,b));
|
|
if (!test_bit(Faulty, &rdev->flags)) {
|
|
md_super_write(mddev,rdev,
|
|
rdev->sb_offset<<1, rdev->sb_size,
|
|
rdev->sb_page);
|
|
dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
|
|
bdevname(rdev->bdev,b),
|
|
(unsigned long long)rdev->sb_offset);
|
|
rdev->sb_events = mddev->events;
|
|
|
|
} else
|
|
dprintk(")\n");
|
|
if (mddev->level == LEVEL_MULTIPATH)
|
|
/* only need to write one superblock... */
|
|
break;
|
|
}
|
|
md_super_wait(mddev);
|
|
/* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
|
|
|
|
spin_lock_irq(&mddev->write_lock);
|
|
if (mddev->in_sync != sync_req ||
|
|
test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
|
|
/* have to write it out again */
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
goto repeat;
|
|
}
|
|
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
wake_up(&mddev->sb_wait);
|
|
|
|
}
|
|
|
|
/* words written to sysfs files may, or my not, be \n terminated.
|
|
* We want to accept with case. For this we use cmd_match.
|
|
*/
|
|
static int cmd_match(const char *cmd, const char *str)
|
|
{
|
|
/* See if cmd, written into a sysfs file, matches
|
|
* str. They must either be the same, or cmd can
|
|
* have a trailing newline
|
|
*/
|
|
while (*cmd && *str && *cmd == *str) {
|
|
cmd++;
|
|
str++;
|
|
}
|
|
if (*cmd == '\n')
|
|
cmd++;
|
|
if (*str || *cmd)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
struct rdev_sysfs_entry {
|
|
struct attribute attr;
|
|
ssize_t (*show)(mdk_rdev_t *, char *);
|
|
ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
|
|
};
|
|
|
|
static ssize_t
|
|
state_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
char *sep = "";
|
|
int len=0;
|
|
|
|
if (test_bit(Faulty, &rdev->flags)) {
|
|
len+= sprintf(page+len, "%sfaulty",sep);
|
|
sep = ",";
|
|
}
|
|
if (test_bit(In_sync, &rdev->flags)) {
|
|
len += sprintf(page+len, "%sin_sync",sep);
|
|
sep = ",";
|
|
}
|
|
if (test_bit(WriteMostly, &rdev->flags)) {
|
|
len += sprintf(page+len, "%swrite_mostly",sep);
|
|
sep = ",";
|
|
}
|
|
if (!test_bit(Faulty, &rdev->flags) &&
|
|
!test_bit(In_sync, &rdev->flags)) {
|
|
len += sprintf(page+len, "%sspare", sep);
|
|
sep = ",";
|
|
}
|
|
return len+sprintf(page+len, "\n");
|
|
}
|
|
|
|
static ssize_t
|
|
state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
|
|
{
|
|
/* can write
|
|
* faulty - simulates and error
|
|
* remove - disconnects the device
|
|
* writemostly - sets write_mostly
|
|
* -writemostly - clears write_mostly
|
|
*/
|
|
int err = -EINVAL;
|
|
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
|
|
md_error(rdev->mddev, rdev);
|
|
err = 0;
|
|
} else if (cmd_match(buf, "remove")) {
|
|
if (rdev->raid_disk >= 0)
|
|
err = -EBUSY;
|
|
else {
|
|
mddev_t *mddev = rdev->mddev;
|
|
kick_rdev_from_array(rdev);
|
|
if (mddev->pers)
|
|
md_update_sb(mddev, 1);
|
|
md_new_event(mddev);
|
|
err = 0;
|
|
}
|
|
} else if (cmd_match(buf, "writemostly")) {
|
|
set_bit(WriteMostly, &rdev->flags);
|
|
err = 0;
|
|
} else if (cmd_match(buf, "-writemostly")) {
|
|
clear_bit(WriteMostly, &rdev->flags);
|
|
err = 0;
|
|
}
|
|
return err ? err : len;
|
|
}
|
|
static struct rdev_sysfs_entry rdev_state =
|
|
__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
|
|
|
|
static ssize_t
|
|
super_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
if (rdev->sb_loaded && rdev->sb_size) {
|
|
memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
|
|
return rdev->sb_size;
|
|
} else
|
|
return 0;
|
|
}
|
|
static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
|
|
|
|
static ssize_t
|
|
errors_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
|
|
}
|
|
|
|
static ssize_t
|
|
errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long n = simple_strtoul(buf, &e, 10);
|
|
if (*buf && (*e == 0 || *e == '\n')) {
|
|
atomic_set(&rdev->corrected_errors, n);
|
|
return len;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
static struct rdev_sysfs_entry rdev_errors =
|
|
__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
|
|
|
|
static ssize_t
|
|
slot_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
if (rdev->raid_disk < 0)
|
|
return sprintf(page, "none\n");
|
|
else
|
|
return sprintf(page, "%d\n", rdev->raid_disk);
|
|
}
|
|
|
|
static ssize_t
|
|
slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
int slot = simple_strtoul(buf, &e, 10);
|
|
if (strncmp(buf, "none", 4)==0)
|
|
slot = -1;
|
|
else if (e==buf || (*e && *e!= '\n'))
|
|
return -EINVAL;
|
|
if (rdev->mddev->pers)
|
|
/* Cannot set slot in active array (yet) */
|
|
return -EBUSY;
|
|
if (slot >= rdev->mddev->raid_disks)
|
|
return -ENOSPC;
|
|
rdev->raid_disk = slot;
|
|
/* assume it is working */
|
|
rdev->flags = 0;
|
|
set_bit(In_sync, &rdev->flags);
|
|
return len;
|
|
}
|
|
|
|
|
|
static struct rdev_sysfs_entry rdev_slot =
|
|
__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
|
|
|
|
static ssize_t
|
|
offset_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
|
|
}
|
|
|
|
static ssize_t
|
|
offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long long offset = simple_strtoull(buf, &e, 10);
|
|
if (e==buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
if (rdev->mddev->pers)
|
|
return -EBUSY;
|
|
rdev->data_offset = offset;
|
|
return len;
|
|
}
|
|
|
|
static struct rdev_sysfs_entry rdev_offset =
|
|
__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
|
|
|
|
static ssize_t
|
|
rdev_size_show(mdk_rdev_t *rdev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
|
|
}
|
|
|
|
static ssize_t
|
|
rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long long size = simple_strtoull(buf, &e, 10);
|
|
if (e==buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
if (rdev->mddev->pers)
|
|
return -EBUSY;
|
|
rdev->size = size;
|
|
if (size < rdev->mddev->size || rdev->mddev->size == 0)
|
|
rdev->mddev->size = size;
|
|
return len;
|
|
}
|
|
|
|
static struct rdev_sysfs_entry rdev_size =
|
|
__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
|
|
|
|
static struct attribute *rdev_default_attrs[] = {
|
|
&rdev_state.attr,
|
|
&rdev_super.attr,
|
|
&rdev_errors.attr,
|
|
&rdev_slot.attr,
|
|
&rdev_offset.attr,
|
|
&rdev_size.attr,
|
|
NULL,
|
|
};
|
|
static ssize_t
|
|
rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
|
|
{
|
|
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
|
|
mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
|
|
|
|
if (!entry->show)
|
|
return -EIO;
|
|
return entry->show(rdev, page);
|
|
}
|
|
|
|
static ssize_t
|
|
rdev_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *page, size_t length)
|
|
{
|
|
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
|
|
mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
|
|
|
|
if (!entry->store)
|
|
return -EIO;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
return entry->store(rdev, page, length);
|
|
}
|
|
|
|
static void rdev_free(struct kobject *ko)
|
|
{
|
|
mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
|
|
kfree(rdev);
|
|
}
|
|
static struct sysfs_ops rdev_sysfs_ops = {
|
|
.show = rdev_attr_show,
|
|
.store = rdev_attr_store,
|
|
};
|
|
static struct kobj_type rdev_ktype = {
|
|
.release = rdev_free,
|
|
.sysfs_ops = &rdev_sysfs_ops,
|
|
.default_attrs = rdev_default_attrs,
|
|
};
|
|
|
|
/*
|
|
* Import a device. If 'super_format' >= 0, then sanity check the superblock
|
|
*
|
|
* mark the device faulty if:
|
|
*
|
|
* - the device is nonexistent (zero size)
|
|
* - the device has no valid superblock
|
|
*
|
|
* a faulty rdev _never_ has rdev->sb set.
|
|
*/
|
|
static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
int err;
|
|
mdk_rdev_t *rdev;
|
|
sector_t size;
|
|
|
|
rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
|
|
if (!rdev) {
|
|
printk(KERN_ERR "md: could not alloc mem for new device!\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
if ((err = alloc_disk_sb(rdev)))
|
|
goto abort_free;
|
|
|
|
err = lock_rdev(rdev, newdev);
|
|
if (err)
|
|
goto abort_free;
|
|
|
|
rdev->kobj.parent = NULL;
|
|
rdev->kobj.ktype = &rdev_ktype;
|
|
kobject_init(&rdev->kobj);
|
|
|
|
rdev->desc_nr = -1;
|
|
rdev->saved_raid_disk = -1;
|
|
rdev->raid_disk = -1;
|
|
rdev->flags = 0;
|
|
rdev->data_offset = 0;
|
|
rdev->sb_events = 0;
|
|
atomic_set(&rdev->nr_pending, 0);
|
|
atomic_set(&rdev->read_errors, 0);
|
|
atomic_set(&rdev->corrected_errors, 0);
|
|
|
|
size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
if (!size) {
|
|
printk(KERN_WARNING
|
|
"md: %s has zero or unknown size, marking faulty!\n",
|
|
bdevname(rdev->bdev,b));
|
|
err = -EINVAL;
|
|
goto abort_free;
|
|
}
|
|
|
|
if (super_format >= 0) {
|
|
err = super_types[super_format].
|
|
load_super(rdev, NULL, super_minor);
|
|
if (err == -EINVAL) {
|
|
printk(KERN_WARNING
|
|
"md: %s has invalid sb, not importing!\n",
|
|
bdevname(rdev->bdev,b));
|
|
goto abort_free;
|
|
}
|
|
if (err < 0) {
|
|
printk(KERN_WARNING
|
|
"md: could not read %s's sb, not importing!\n",
|
|
bdevname(rdev->bdev,b));
|
|
goto abort_free;
|
|
}
|
|
}
|
|
INIT_LIST_HEAD(&rdev->same_set);
|
|
|
|
return rdev;
|
|
|
|
abort_free:
|
|
if (rdev->sb_page) {
|
|
if (rdev->bdev)
|
|
unlock_rdev(rdev);
|
|
free_disk_sb(rdev);
|
|
}
|
|
kfree(rdev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/*
|
|
* Check a full RAID array for plausibility
|
|
*/
|
|
|
|
|
|
static void analyze_sbs(mddev_t * mddev)
|
|
{
|
|
int i;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev, *freshest;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
freshest = NULL;
|
|
ITERATE_RDEV(mddev,rdev,tmp)
|
|
switch (super_types[mddev->major_version].
|
|
load_super(rdev, freshest, mddev->minor_version)) {
|
|
case 1:
|
|
freshest = rdev;
|
|
break;
|
|
case 0:
|
|
break;
|
|
default:
|
|
printk( KERN_ERR \
|
|
"md: fatal superblock inconsistency in %s"
|
|
" -- removing from array\n",
|
|
bdevname(rdev->bdev,b));
|
|
kick_rdev_from_array(rdev);
|
|
}
|
|
|
|
|
|
super_types[mddev->major_version].
|
|
validate_super(mddev, freshest);
|
|
|
|
i = 0;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (rdev != freshest)
|
|
if (super_types[mddev->major_version].
|
|
validate_super(mddev, rdev)) {
|
|
printk(KERN_WARNING "md: kicking non-fresh %s"
|
|
" from array!\n",
|
|
bdevname(rdev->bdev,b));
|
|
kick_rdev_from_array(rdev);
|
|
continue;
|
|
}
|
|
if (mddev->level == LEVEL_MULTIPATH) {
|
|
rdev->desc_nr = i++;
|
|
rdev->raid_disk = rdev->desc_nr;
|
|
set_bit(In_sync, &rdev->flags);
|
|
} else if (rdev->raid_disk >= mddev->raid_disks) {
|
|
rdev->raid_disk = -1;
|
|
clear_bit(In_sync, &rdev->flags);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
if (mddev->recovery_cp != MaxSector &&
|
|
mddev->level >= 1)
|
|
printk(KERN_ERR "md: %s: raid array is not clean"
|
|
" -- starting background reconstruction\n",
|
|
mdname(mddev));
|
|
|
|
}
|
|
|
|
static ssize_t
|
|
safe_delay_show(mddev_t *mddev, char *page)
|
|
{
|
|
int msec = (mddev->safemode_delay*1000)/HZ;
|
|
return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
|
|
}
|
|
static ssize_t
|
|
safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
|
|
{
|
|
int scale=1;
|
|
int dot=0;
|
|
int i;
|
|
unsigned long msec;
|
|
char buf[30];
|
|
char *e;
|
|
/* remove a period, and count digits after it */
|
|
if (len >= sizeof(buf))
|
|
return -EINVAL;
|
|
strlcpy(buf, cbuf, len);
|
|
buf[len] = 0;
|
|
for (i=0; i<len; i++) {
|
|
if (dot) {
|
|
if (isdigit(buf[i])) {
|
|
buf[i-1] = buf[i];
|
|
scale *= 10;
|
|
}
|
|
buf[i] = 0;
|
|
} else if (buf[i] == '.') {
|
|
dot=1;
|
|
buf[i] = 0;
|
|
}
|
|
}
|
|
msec = simple_strtoul(buf, &e, 10);
|
|
if (e == buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
msec = (msec * 1000) / scale;
|
|
if (msec == 0)
|
|
mddev->safemode_delay = 0;
|
|
else {
|
|
mddev->safemode_delay = (msec*HZ)/1000;
|
|
if (mddev->safemode_delay == 0)
|
|
mddev->safemode_delay = 1;
|
|
}
|
|
return len;
|
|
}
|
|
static struct md_sysfs_entry md_safe_delay =
|
|
__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
|
|
|
|
static ssize_t
|
|
level_show(mddev_t *mddev, char *page)
|
|
{
|
|
struct mdk_personality *p = mddev->pers;
|
|
if (p)
|
|
return sprintf(page, "%s\n", p->name);
|
|
else if (mddev->clevel[0])
|
|
return sprintf(page, "%s\n", mddev->clevel);
|
|
else if (mddev->level != LEVEL_NONE)
|
|
return sprintf(page, "%d\n", mddev->level);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
level_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
int rv = len;
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
if (len == 0)
|
|
return 0;
|
|
if (len >= sizeof(mddev->clevel))
|
|
return -ENOSPC;
|
|
strncpy(mddev->clevel, buf, len);
|
|
if (mddev->clevel[len-1] == '\n')
|
|
len--;
|
|
mddev->clevel[len] = 0;
|
|
mddev->level = LEVEL_NONE;
|
|
return rv;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_level =
|
|
__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
|
|
|
|
|
|
static ssize_t
|
|
layout_show(mddev_t *mddev, char *page)
|
|
{
|
|
/* just a number, not meaningful for all levels */
|
|
if (mddev->reshape_position != MaxSector &&
|
|
mddev->layout != mddev->new_layout)
|
|
return sprintf(page, "%d (%d)\n",
|
|
mddev->new_layout, mddev->layout);
|
|
return sprintf(page, "%d\n", mddev->layout);
|
|
}
|
|
|
|
static ssize_t
|
|
layout_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long n = simple_strtoul(buf, &e, 10);
|
|
|
|
if (!*buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
if (mddev->reshape_position != MaxSector)
|
|
mddev->new_layout = n;
|
|
else
|
|
mddev->layout = n;
|
|
return len;
|
|
}
|
|
static struct md_sysfs_entry md_layout =
|
|
__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
|
|
|
|
|
|
static ssize_t
|
|
raid_disks_show(mddev_t *mddev, char *page)
|
|
{
|
|
if (mddev->raid_disks == 0)
|
|
return 0;
|
|
if (mddev->reshape_position != MaxSector &&
|
|
mddev->delta_disks != 0)
|
|
return sprintf(page, "%d (%d)\n", mddev->raid_disks,
|
|
mddev->raid_disks - mddev->delta_disks);
|
|
return sprintf(page, "%d\n", mddev->raid_disks);
|
|
}
|
|
|
|
static int update_raid_disks(mddev_t *mddev, int raid_disks);
|
|
|
|
static ssize_t
|
|
raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
int rv = 0;
|
|
unsigned long n = simple_strtoul(buf, &e, 10);
|
|
|
|
if (!*buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers)
|
|
rv = update_raid_disks(mddev, n);
|
|
else if (mddev->reshape_position != MaxSector) {
|
|
int olddisks = mddev->raid_disks - mddev->delta_disks;
|
|
mddev->delta_disks = n - olddisks;
|
|
mddev->raid_disks = n;
|
|
} else
|
|
mddev->raid_disks = n;
|
|
return rv ? rv : len;
|
|
}
|
|
static struct md_sysfs_entry md_raid_disks =
|
|
__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
|
|
|
|
static ssize_t
|
|
chunk_size_show(mddev_t *mddev, char *page)
|
|
{
|
|
if (mddev->reshape_position != MaxSector &&
|
|
mddev->chunk_size != mddev->new_chunk)
|
|
return sprintf(page, "%d (%d)\n", mddev->new_chunk,
|
|
mddev->chunk_size);
|
|
return sprintf(page, "%d\n", mddev->chunk_size);
|
|
}
|
|
|
|
static ssize_t
|
|
chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
/* can only set chunk_size if array is not yet active */
|
|
char *e;
|
|
unsigned long n = simple_strtoul(buf, &e, 10);
|
|
|
|
if (!*buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
else if (mddev->reshape_position != MaxSector)
|
|
mddev->new_chunk = n;
|
|
else
|
|
mddev->chunk_size = n;
|
|
return len;
|
|
}
|
|
static struct md_sysfs_entry md_chunk_size =
|
|
__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
|
|
|
|
static ssize_t
|
|
resync_start_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
|
|
}
|
|
|
|
static ssize_t
|
|
resync_start_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
/* can only set chunk_size if array is not yet active */
|
|
char *e;
|
|
unsigned long long n = simple_strtoull(buf, &e, 10);
|
|
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
if (!*buf || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
|
|
mddev->recovery_cp = n;
|
|
return len;
|
|
}
|
|
static struct md_sysfs_entry md_resync_start =
|
|
__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
|
|
|
|
/*
|
|
* The array state can be:
|
|
*
|
|
* clear
|
|
* No devices, no size, no level
|
|
* Equivalent to STOP_ARRAY ioctl
|
|
* inactive
|
|
* May have some settings, but array is not active
|
|
* all IO results in error
|
|
* When written, doesn't tear down array, but just stops it
|
|
* suspended (not supported yet)
|
|
* All IO requests will block. The array can be reconfigured.
|
|
* Writing this, if accepted, will block until array is quiessent
|
|
* readonly
|
|
* no resync can happen. no superblocks get written.
|
|
* write requests fail
|
|
* read-auto
|
|
* like readonly, but behaves like 'clean' on a write request.
|
|
*
|
|
* clean - no pending writes, but otherwise active.
|
|
* When written to inactive array, starts without resync
|
|
* If a write request arrives then
|
|
* if metadata is known, mark 'dirty' and switch to 'active'.
|
|
* if not known, block and switch to write-pending
|
|
* If written to an active array that has pending writes, then fails.
|
|
* active
|
|
* fully active: IO and resync can be happening.
|
|
* When written to inactive array, starts with resync
|
|
*
|
|
* write-pending
|
|
* clean, but writes are blocked waiting for 'active' to be written.
|
|
*
|
|
* active-idle
|
|
* like active, but no writes have been seen for a while (100msec).
|
|
*
|
|
*/
|
|
enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
|
|
write_pending, active_idle, bad_word};
|
|
static char *array_states[] = {
|
|
"clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
|
|
"write-pending", "active-idle", NULL };
|
|
|
|
static int match_word(const char *word, char **list)
|
|
{
|
|
int n;
|
|
for (n=0; list[n]; n++)
|
|
if (cmd_match(word, list[n]))
|
|
break;
|
|
return n;
|
|
}
|
|
|
|
static ssize_t
|
|
array_state_show(mddev_t *mddev, char *page)
|
|
{
|
|
enum array_state st = inactive;
|
|
|
|
if (mddev->pers)
|
|
switch(mddev->ro) {
|
|
case 1:
|
|
st = readonly;
|
|
break;
|
|
case 2:
|
|
st = read_auto;
|
|
break;
|
|
case 0:
|
|
if (mddev->in_sync)
|
|
st = clean;
|
|
else if (mddev->safemode)
|
|
st = active_idle;
|
|
else
|
|
st = active;
|
|
}
|
|
else {
|
|
if (list_empty(&mddev->disks) &&
|
|
mddev->raid_disks == 0 &&
|
|
mddev->size == 0)
|
|
st = clear;
|
|
else
|
|
st = inactive;
|
|
}
|
|
return sprintf(page, "%s\n", array_states[st]);
|
|
}
|
|
|
|
static int do_md_stop(mddev_t * mddev, int ro);
|
|
static int do_md_run(mddev_t * mddev);
|
|
static int restart_array(mddev_t *mddev);
|
|
|
|
static ssize_t
|
|
array_state_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
int err = -EINVAL;
|
|
enum array_state st = match_word(buf, array_states);
|
|
switch(st) {
|
|
case bad_word:
|
|
break;
|
|
case clear:
|
|
/* stopping an active array */
|
|
if (mddev->pers) {
|
|
if (atomic_read(&mddev->active) > 1)
|
|
return -EBUSY;
|
|
err = do_md_stop(mddev, 0);
|
|
}
|
|
break;
|
|
case inactive:
|
|
/* stopping an active array */
|
|
if (mddev->pers) {
|
|
if (atomic_read(&mddev->active) > 1)
|
|
return -EBUSY;
|
|
err = do_md_stop(mddev, 2);
|
|
}
|
|
break;
|
|
case suspended:
|
|
break; /* not supported yet */
|
|
case readonly:
|
|
if (mddev->pers)
|
|
err = do_md_stop(mddev, 1);
|
|
else {
|
|
mddev->ro = 1;
|
|
err = do_md_run(mddev);
|
|
}
|
|
break;
|
|
case read_auto:
|
|
/* stopping an active array */
|
|
if (mddev->pers) {
|
|
err = do_md_stop(mddev, 1);
|
|
if (err == 0)
|
|
mddev->ro = 2; /* FIXME mark devices writable */
|
|
} else {
|
|
mddev->ro = 2;
|
|
err = do_md_run(mddev);
|
|
}
|
|
break;
|
|
case clean:
|
|
if (mddev->pers) {
|
|
restart_array(mddev);
|
|
spin_lock_irq(&mddev->write_lock);
|
|
if (atomic_read(&mddev->writes_pending) == 0) {
|
|
mddev->in_sync = 1;
|
|
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
|
|
}
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
} else {
|
|
mddev->ro = 0;
|
|
mddev->recovery_cp = MaxSector;
|
|
err = do_md_run(mddev);
|
|
}
|
|
break;
|
|
case active:
|
|
if (mddev->pers) {
|
|
restart_array(mddev);
|
|
clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
|
|
wake_up(&mddev->sb_wait);
|
|
err = 0;
|
|
} else {
|
|
mddev->ro = 0;
|
|
err = do_md_run(mddev);
|
|
}
|
|
break;
|
|
case write_pending:
|
|
case active_idle:
|
|
/* these cannot be set */
|
|
break;
|
|
}
|
|
if (err)
|
|
return err;
|
|
else
|
|
return len;
|
|
}
|
|
static struct md_sysfs_entry md_array_state =
|
|
__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
|
|
|
|
static ssize_t
|
|
null_show(mddev_t *mddev, char *page)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t
|
|
new_dev_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
/* buf must be %d:%d\n? giving major and minor numbers */
|
|
/* The new device is added to the array.
|
|
* If the array has a persistent superblock, we read the
|
|
* superblock to initialise info and check validity.
|
|
* Otherwise, only checking done is that in bind_rdev_to_array,
|
|
* which mainly checks size.
|
|
*/
|
|
char *e;
|
|
int major = simple_strtoul(buf, &e, 10);
|
|
int minor;
|
|
dev_t dev;
|
|
mdk_rdev_t *rdev;
|
|
int err;
|
|
|
|
if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
|
|
return -EINVAL;
|
|
minor = simple_strtoul(e+1, &e, 10);
|
|
if (*e && *e != '\n')
|
|
return -EINVAL;
|
|
dev = MKDEV(major, minor);
|
|
if (major != MAJOR(dev) ||
|
|
minor != MINOR(dev))
|
|
return -EOVERFLOW;
|
|
|
|
|
|
if (mddev->persistent) {
|
|
rdev = md_import_device(dev, mddev->major_version,
|
|
mddev->minor_version);
|
|
if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
|
|
mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
|
|
mdk_rdev_t, same_set);
|
|
err = super_types[mddev->major_version]
|
|
.load_super(rdev, rdev0, mddev->minor_version);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
} else
|
|
rdev = md_import_device(dev, -1, -1);
|
|
|
|
if (IS_ERR(rdev))
|
|
return PTR_ERR(rdev);
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
out:
|
|
if (err)
|
|
export_rdev(rdev);
|
|
return err ? err : len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_new_device =
|
|
__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
|
|
|
|
static ssize_t
|
|
bitmap_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *end;
|
|
unsigned long chunk, end_chunk;
|
|
|
|
if (!mddev->bitmap)
|
|
goto out;
|
|
/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
|
|
while (*buf) {
|
|
chunk = end_chunk = simple_strtoul(buf, &end, 0);
|
|
if (buf == end) break;
|
|
if (*end == '-') { /* range */
|
|
buf = end + 1;
|
|
end_chunk = simple_strtoul(buf, &end, 0);
|
|
if (buf == end) break;
|
|
}
|
|
if (*end && !isspace(*end)) break;
|
|
bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
|
|
buf = end;
|
|
while (isspace(*buf)) buf++;
|
|
}
|
|
bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
|
|
out:
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_bitmap =
|
|
__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
|
|
|
|
static ssize_t
|
|
size_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
|
|
}
|
|
|
|
static int update_size(mddev_t *mddev, unsigned long size);
|
|
|
|
static ssize_t
|
|
size_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
/* If array is inactive, we can reduce the component size, but
|
|
* not increase it (except from 0).
|
|
* If array is active, we can try an on-line resize
|
|
*/
|
|
char *e;
|
|
int err = 0;
|
|
unsigned long long size = simple_strtoull(buf, &e, 10);
|
|
if (!*buf || *buf == '\n' ||
|
|
(*e && *e != '\n'))
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers) {
|
|
err = update_size(mddev, size);
|
|
md_update_sb(mddev, 1);
|
|
} else {
|
|
if (mddev->size == 0 ||
|
|
mddev->size > size)
|
|
mddev->size = size;
|
|
else
|
|
err = -ENOSPC;
|
|
}
|
|
return err ? err : len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_size =
|
|
__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
|
|
|
|
|
|
/* Metdata version.
|
|
* This is either 'none' for arrays with externally managed metadata,
|
|
* or N.M for internally known formats
|
|
*/
|
|
static ssize_t
|
|
metadata_show(mddev_t *mddev, char *page)
|
|
{
|
|
if (mddev->persistent)
|
|
return sprintf(page, "%d.%d\n",
|
|
mddev->major_version, mddev->minor_version);
|
|
else
|
|
return sprintf(page, "none\n");
|
|
}
|
|
|
|
static ssize_t
|
|
metadata_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
int major, minor;
|
|
char *e;
|
|
if (!list_empty(&mddev->disks))
|
|
return -EBUSY;
|
|
|
|
if (cmd_match(buf, "none")) {
|
|
mddev->persistent = 0;
|
|
mddev->major_version = 0;
|
|
mddev->minor_version = 90;
|
|
return len;
|
|
}
|
|
major = simple_strtoul(buf, &e, 10);
|
|
if (e==buf || *e != '.')
|
|
return -EINVAL;
|
|
buf = e+1;
|
|
minor = simple_strtoul(buf, &e, 10);
|
|
if (e==buf || (*e && *e != '\n') )
|
|
return -EINVAL;
|
|
if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
|
|
return -ENOENT;
|
|
mddev->major_version = major;
|
|
mddev->minor_version = minor;
|
|
mddev->persistent = 1;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_metadata =
|
|
__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
|
|
|
|
static ssize_t
|
|
action_show(mddev_t *mddev, char *page)
|
|
{
|
|
char *type = "idle";
|
|
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
|
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
|
|
type = "reshape";
|
|
else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
|
|
if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
|
|
type = "resync";
|
|
else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
|
|
type = "check";
|
|
else
|
|
type = "repair";
|
|
} else
|
|
type = "recover";
|
|
}
|
|
return sprintf(page, "%s\n", type);
|
|
}
|
|
|
|
static ssize_t
|
|
action_store(mddev_t *mddev, const char *page, size_t len)
|
|
{
|
|
if (!mddev->pers || !mddev->pers->sync_request)
|
|
return -EINVAL;
|
|
|
|
if (cmd_match(page, "idle")) {
|
|
if (mddev->sync_thread) {
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
md_unregister_thread(mddev->sync_thread);
|
|
mddev->sync_thread = NULL;
|
|
mddev->recovery = 0;
|
|
}
|
|
} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
|
|
return -EBUSY;
|
|
else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
else if (cmd_match(page, "reshape")) {
|
|
int err;
|
|
if (mddev->pers->start_reshape == NULL)
|
|
return -EINVAL;
|
|
err = mddev->pers->start_reshape(mddev);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
if (cmd_match(page, "check"))
|
|
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
|
|
else if (!cmd_match(page, "repair"))
|
|
return -EINVAL;
|
|
set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
|
|
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
|
|
}
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
mismatch_cnt_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n",
|
|
(unsigned long long) mddev->resync_mismatches);
|
|
}
|
|
|
|
static struct md_sysfs_entry md_scan_mode =
|
|
__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
|
|
|
|
|
|
static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
|
|
|
|
static ssize_t
|
|
sync_min_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%d (%s)\n", speed_min(mddev),
|
|
mddev->sync_speed_min ? "local": "system");
|
|
}
|
|
|
|
static ssize_t
|
|
sync_min_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
int min;
|
|
char *e;
|
|
if (strncmp(buf, "system", 6)==0) {
|
|
mddev->sync_speed_min = 0;
|
|
return len;
|
|
}
|
|
min = simple_strtoul(buf, &e, 10);
|
|
if (buf == e || (*e && *e != '\n') || min <= 0)
|
|
return -EINVAL;
|
|
mddev->sync_speed_min = min;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_sync_min =
|
|
__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
|
|
|
|
static ssize_t
|
|
sync_max_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%d (%s)\n", speed_max(mddev),
|
|
mddev->sync_speed_max ? "local": "system");
|
|
}
|
|
|
|
static ssize_t
|
|
sync_max_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
int max;
|
|
char *e;
|
|
if (strncmp(buf, "system", 6)==0) {
|
|
mddev->sync_speed_max = 0;
|
|
return len;
|
|
}
|
|
max = simple_strtoul(buf, &e, 10);
|
|
if (buf == e || (*e && *e != '\n') || max <= 0)
|
|
return -EINVAL;
|
|
mddev->sync_speed_max = max;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_sync_max =
|
|
__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
|
|
|
|
|
|
static ssize_t
|
|
sync_speed_show(mddev_t *mddev, char *page)
|
|
{
|
|
unsigned long resync, dt, db;
|
|
resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
|
|
dt = ((jiffies - mddev->resync_mark) / HZ);
|
|
if (!dt) dt++;
|
|
db = resync - (mddev->resync_mark_cnt);
|
|
return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
|
|
}
|
|
|
|
static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
|
|
|
|
static ssize_t
|
|
sync_completed_show(mddev_t *mddev, char *page)
|
|
{
|
|
unsigned long max_blocks, resync;
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
max_blocks = mddev->resync_max_sectors;
|
|
else
|
|
max_blocks = mddev->size << 1;
|
|
|
|
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
|
|
return sprintf(page, "%lu / %lu\n", resync, max_blocks);
|
|
}
|
|
|
|
static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
|
|
|
|
static ssize_t
|
|
suspend_lo_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
|
|
}
|
|
|
|
static ssize_t
|
|
suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long long new = simple_strtoull(buf, &e, 10);
|
|
|
|
if (mddev->pers->quiesce == NULL)
|
|
return -EINVAL;
|
|
if (buf == e || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
if (new >= mddev->suspend_hi ||
|
|
(new > mddev->suspend_lo && new < mddev->suspend_hi)) {
|
|
mddev->suspend_lo = new;
|
|
mddev->pers->quiesce(mddev, 2);
|
|
return len;
|
|
} else
|
|
return -EINVAL;
|
|
}
|
|
static struct md_sysfs_entry md_suspend_lo =
|
|
__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
|
|
|
|
|
|
static ssize_t
|
|
suspend_hi_show(mddev_t *mddev, char *page)
|
|
{
|
|
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
|
|
}
|
|
|
|
static ssize_t
|
|
suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long long new = simple_strtoull(buf, &e, 10);
|
|
|
|
if (mddev->pers->quiesce == NULL)
|
|
return -EINVAL;
|
|
if (buf == e || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
|
|
(new > mddev->suspend_lo && new > mddev->suspend_hi)) {
|
|
mddev->suspend_hi = new;
|
|
mddev->pers->quiesce(mddev, 1);
|
|
mddev->pers->quiesce(mddev, 0);
|
|
return len;
|
|
} else
|
|
return -EINVAL;
|
|
}
|
|
static struct md_sysfs_entry md_suspend_hi =
|
|
__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
|
|
|
|
static ssize_t
|
|
reshape_position_show(mddev_t *mddev, char *page)
|
|
{
|
|
if (mddev->reshape_position != MaxSector)
|
|
return sprintf(page, "%llu\n",
|
|
(unsigned long long)mddev->reshape_position);
|
|
strcpy(page, "none\n");
|
|
return 5;
|
|
}
|
|
|
|
static ssize_t
|
|
reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
|
|
{
|
|
char *e;
|
|
unsigned long long new = simple_strtoull(buf, &e, 10);
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
if (buf == e || (*e && *e != '\n'))
|
|
return -EINVAL;
|
|
mddev->reshape_position = new;
|
|
mddev->delta_disks = 0;
|
|
mddev->new_level = mddev->level;
|
|
mddev->new_layout = mddev->layout;
|
|
mddev->new_chunk = mddev->chunk_size;
|
|
return len;
|
|
}
|
|
|
|
static struct md_sysfs_entry md_reshape_position =
|
|
__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
|
|
reshape_position_store);
|
|
|
|
|
|
static struct attribute *md_default_attrs[] = {
|
|
&md_level.attr,
|
|
&md_layout.attr,
|
|
&md_raid_disks.attr,
|
|
&md_chunk_size.attr,
|
|
&md_size.attr,
|
|
&md_resync_start.attr,
|
|
&md_metadata.attr,
|
|
&md_new_device.attr,
|
|
&md_safe_delay.attr,
|
|
&md_array_state.attr,
|
|
&md_reshape_position.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *md_redundancy_attrs[] = {
|
|
&md_scan_mode.attr,
|
|
&md_mismatches.attr,
|
|
&md_sync_min.attr,
|
|
&md_sync_max.attr,
|
|
&md_sync_speed.attr,
|
|
&md_sync_completed.attr,
|
|
&md_suspend_lo.attr,
|
|
&md_suspend_hi.attr,
|
|
&md_bitmap.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group md_redundancy_group = {
|
|
.name = NULL,
|
|
.attrs = md_redundancy_attrs,
|
|
};
|
|
|
|
|
|
static ssize_t
|
|
md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
|
|
{
|
|
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
|
|
mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
|
|
ssize_t rv;
|
|
|
|
if (!entry->show)
|
|
return -EIO;
|
|
rv = mddev_lock(mddev);
|
|
if (!rv) {
|
|
rv = entry->show(mddev, page);
|
|
mddev_unlock(mddev);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static ssize_t
|
|
md_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *page, size_t length)
|
|
{
|
|
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
|
|
mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
|
|
ssize_t rv;
|
|
|
|
if (!entry->store)
|
|
return -EIO;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
rv = mddev_lock(mddev);
|
|
if (!rv) {
|
|
rv = entry->store(mddev, page, length);
|
|
mddev_unlock(mddev);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static void md_free(struct kobject *ko)
|
|
{
|
|
mddev_t *mddev = container_of(ko, mddev_t, kobj);
|
|
kfree(mddev);
|
|
}
|
|
|
|
static struct sysfs_ops md_sysfs_ops = {
|
|
.show = md_attr_show,
|
|
.store = md_attr_store,
|
|
};
|
|
static struct kobj_type md_ktype = {
|
|
.release = md_free,
|
|
.sysfs_ops = &md_sysfs_ops,
|
|
.default_attrs = md_default_attrs,
|
|
};
|
|
|
|
int mdp_major = 0;
|
|
|
|
static struct kobject *md_probe(dev_t dev, int *part, void *data)
|
|
{
|
|
static DEFINE_MUTEX(disks_mutex);
|
|
mddev_t *mddev = mddev_find(dev);
|
|
struct gendisk *disk;
|
|
int partitioned = (MAJOR(dev) != MD_MAJOR);
|
|
int shift = partitioned ? MdpMinorShift : 0;
|
|
int unit = MINOR(dev) >> shift;
|
|
|
|
if (!mddev)
|
|
return NULL;
|
|
|
|
mutex_lock(&disks_mutex);
|
|
if (mddev->gendisk) {
|
|
mutex_unlock(&disks_mutex);
|
|
mddev_put(mddev);
|
|
return NULL;
|
|
}
|
|
disk = alloc_disk(1 << shift);
|
|
if (!disk) {
|
|
mutex_unlock(&disks_mutex);
|
|
mddev_put(mddev);
|
|
return NULL;
|
|
}
|
|
disk->major = MAJOR(dev);
|
|
disk->first_minor = unit << shift;
|
|
if (partitioned)
|
|
sprintf(disk->disk_name, "md_d%d", unit);
|
|
else
|
|
sprintf(disk->disk_name, "md%d", unit);
|
|
disk->fops = &md_fops;
|
|
disk->private_data = mddev;
|
|
disk->queue = mddev->queue;
|
|
add_disk(disk);
|
|
mddev->gendisk = disk;
|
|
mutex_unlock(&disks_mutex);
|
|
mddev->kobj.parent = &disk->kobj;
|
|
mddev->kobj.k_name = NULL;
|
|
snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
|
|
mddev->kobj.ktype = &md_ktype;
|
|
if (kobject_register(&mddev->kobj))
|
|
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
|
|
disk->disk_name);
|
|
return NULL;
|
|
}
|
|
|
|
static void md_safemode_timeout(unsigned long data)
|
|
{
|
|
mddev_t *mddev = (mddev_t *) data;
|
|
|
|
mddev->safemode = 1;
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
|
|
static int start_dirty_degraded;
|
|
|
|
static int do_md_run(mddev_t * mddev)
|
|
{
|
|
int err;
|
|
int chunk_size;
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev;
|
|
struct gendisk *disk;
|
|
struct mdk_personality *pers;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
if (list_empty(&mddev->disks))
|
|
/* cannot run an array with no devices.. */
|
|
return -EINVAL;
|
|
|
|
if (mddev->pers)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* Analyze all RAID superblock(s)
|
|
*/
|
|
if (!mddev->raid_disks)
|
|
analyze_sbs(mddev);
|
|
|
|
chunk_size = mddev->chunk_size;
|
|
|
|
if (chunk_size) {
|
|
if (chunk_size > MAX_CHUNK_SIZE) {
|
|
printk(KERN_ERR "too big chunk_size: %d > %d\n",
|
|
chunk_size, MAX_CHUNK_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* chunk-size has to be a power of 2 and multiples of PAGE_SIZE
|
|
*/
|
|
if ( (1 << ffz(~chunk_size)) != chunk_size) {
|
|
printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
|
|
return -EINVAL;
|
|
}
|
|
if (chunk_size < PAGE_SIZE) {
|
|
printk(KERN_ERR "too small chunk_size: %d < %ld\n",
|
|
chunk_size, PAGE_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* devices must have minimum size of one chunk */
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
continue;
|
|
if (rdev->size < chunk_size / 1024) {
|
|
printk(KERN_WARNING
|
|
"md: Dev %s smaller than chunk_size:"
|
|
" %lluk < %dk\n",
|
|
bdevname(rdev->bdev,b),
|
|
(unsigned long long)rdev->size,
|
|
chunk_size / 1024);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_KMOD
|
|
if (mddev->level != LEVEL_NONE)
|
|
request_module("md-level-%d", mddev->level);
|
|
else if (mddev->clevel[0])
|
|
request_module("md-%s", mddev->clevel);
|
|
#endif
|
|
|
|
/*
|
|
* Drop all container device buffers, from now on
|
|
* the only valid external interface is through the md
|
|
* device.
|
|
* Also find largest hardsector size
|
|
*/
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
continue;
|
|
sync_blockdev(rdev->bdev);
|
|
invalidate_bdev(rdev->bdev);
|
|
}
|
|
|
|
md_probe(mddev->unit, NULL, NULL);
|
|
disk = mddev->gendisk;
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&pers_lock);
|
|
pers = find_pers(mddev->level, mddev->clevel);
|
|
if (!pers || !try_module_get(pers->owner)) {
|
|
spin_unlock(&pers_lock);
|
|
if (mddev->level != LEVEL_NONE)
|
|
printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
|
|
mddev->level);
|
|
else
|
|
printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
|
|
mddev->clevel);
|
|
return -EINVAL;
|
|
}
|
|
mddev->pers = pers;
|
|
spin_unlock(&pers_lock);
|
|
mddev->level = pers->level;
|
|
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
|
|
|
|
if (mddev->reshape_position != MaxSector &&
|
|
pers->start_reshape == NULL) {
|
|
/* This personality cannot handle reshaping... */
|
|
mddev->pers = NULL;
|
|
module_put(pers->owner);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pers->sync_request) {
|
|
/* Warn if this is a potentially silly
|
|
* configuration.
|
|
*/
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
mdk_rdev_t *rdev2;
|
|
struct list_head *tmp2;
|
|
int warned = 0;
|
|
ITERATE_RDEV(mddev, rdev, tmp) {
|
|
ITERATE_RDEV(mddev, rdev2, tmp2) {
|
|
if (rdev < rdev2 &&
|
|
rdev->bdev->bd_contains ==
|
|
rdev2->bdev->bd_contains) {
|
|
printk(KERN_WARNING
|
|
"%s: WARNING: %s appears to be"
|
|
" on the same physical disk as"
|
|
" %s.\n",
|
|
mdname(mddev),
|
|
bdevname(rdev->bdev,b),
|
|
bdevname(rdev2->bdev,b2));
|
|
warned = 1;
|
|
}
|
|
}
|
|
}
|
|
if (warned)
|
|
printk(KERN_WARNING
|
|
"True protection against single-disk"
|
|
" failure might be compromised.\n");
|
|
}
|
|
|
|
mddev->recovery = 0;
|
|
mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
|
|
mddev->barriers_work = 1;
|
|
mddev->ok_start_degraded = start_dirty_degraded;
|
|
|
|
if (start_readonly)
|
|
mddev->ro = 2; /* read-only, but switch on first write */
|
|
|
|
err = mddev->pers->run(mddev);
|
|
if (!err && mddev->pers->sync_request) {
|
|
err = bitmap_create(mddev);
|
|
if (err) {
|
|
printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
|
|
mdname(mddev), err);
|
|
mddev->pers->stop(mddev);
|
|
}
|
|
}
|
|
if (err) {
|
|
printk(KERN_ERR "md: pers->run() failed ...\n");
|
|
module_put(mddev->pers->owner);
|
|
mddev->pers = NULL;
|
|
bitmap_destroy(mddev);
|
|
return err;
|
|
}
|
|
if (mddev->pers->sync_request) {
|
|
if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
|
|
printk(KERN_WARNING
|
|
"md: cannot register extra attributes for %s\n",
|
|
mdname(mddev));
|
|
} else if (mddev->ro == 2) /* auto-readonly not meaningful */
|
|
mddev->ro = 0;
|
|
|
|
atomic_set(&mddev->writes_pending,0);
|
|
mddev->safemode = 0;
|
|
mddev->safemode_timer.function = md_safemode_timeout;
|
|
mddev->safemode_timer.data = (unsigned long) mddev;
|
|
mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
|
|
mddev->in_sync = 1;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp)
|
|
if (rdev->raid_disk >= 0) {
|
|
char nm[20];
|
|
sprintf(nm, "rd%d", rdev->raid_disk);
|
|
if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
|
|
printk("md: cannot register %s for %s\n",
|
|
nm, mdname(mddev));
|
|
}
|
|
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
|
|
if (mddev->flags)
|
|
md_update_sb(mddev, 0);
|
|
|
|
set_capacity(disk, mddev->array_size<<1);
|
|
|
|
/* If we call blk_queue_make_request here, it will
|
|
* re-initialise max_sectors etc which may have been
|
|
* refined inside -> run. So just set the bits we need to set.
|
|
* Most initialisation happended when we called
|
|
* blk_queue_make_request(..., md_fail_request)
|
|
* earlier.
|
|
*/
|
|
mddev->queue->queuedata = mddev;
|
|
mddev->queue->make_request_fn = mddev->pers->make_request;
|
|
|
|
/* If there is a partially-recovered drive we need to
|
|
* start recovery here. If we leave it to md_check_recovery,
|
|
* it will remove the drives and not do the right thing
|
|
*/
|
|
if (mddev->degraded && !mddev->sync_thread) {
|
|
struct list_head *rtmp;
|
|
int spares = 0;
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk >= 0 &&
|
|
!test_bit(In_sync, &rdev->flags) &&
|
|
!test_bit(Faulty, &rdev->flags))
|
|
/* complete an interrupted recovery */
|
|
spares++;
|
|
if (spares && mddev->pers->sync_request) {
|
|
mddev->recovery = 0;
|
|
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
|
|
mddev->sync_thread = md_register_thread(md_do_sync,
|
|
mddev,
|
|
"%s_resync");
|
|
if (!mddev->sync_thread) {
|
|
printk(KERN_ERR "%s: could not start resync"
|
|
" thread...\n",
|
|
mdname(mddev));
|
|
/* leave the spares where they are, it shouldn't hurt */
|
|
mddev->recovery = 0;
|
|
}
|
|
}
|
|
}
|
|
md_wakeup_thread(mddev->thread);
|
|
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
|
|
|
|
mddev->changed = 1;
|
|
md_new_event(mddev);
|
|
kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
|
|
return 0;
|
|
}
|
|
|
|
static int restart_array(mddev_t *mddev)
|
|
{
|
|
struct gendisk *disk = mddev->gendisk;
|
|
int err;
|
|
|
|
/*
|
|
* Complain if it has no devices
|
|
*/
|
|
err = -ENXIO;
|
|
if (list_empty(&mddev->disks))
|
|
goto out;
|
|
|
|
if (mddev->pers) {
|
|
err = -EBUSY;
|
|
if (!mddev->ro)
|
|
goto out;
|
|
|
|
mddev->safemode = 0;
|
|
mddev->ro = 0;
|
|
set_disk_ro(disk, 0);
|
|
|
|
printk(KERN_INFO "md: %s switched to read-write mode.\n",
|
|
mdname(mddev));
|
|
/*
|
|
* Kick recovery or resync if necessary
|
|
*/
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
md_wakeup_thread(mddev->sync_thread);
|
|
err = 0;
|
|
} else
|
|
err = -EINVAL;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/* similar to deny_write_access, but accounts for our holding a reference
|
|
* to the file ourselves */
|
|
static int deny_bitmap_write_access(struct file * file)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (atomic_read(&inode->i_writecount) > 1) {
|
|
spin_unlock(&inode->i_lock);
|
|
return -ETXTBSY;
|
|
}
|
|
atomic_set(&inode->i_writecount, -1);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void restore_bitmap_write_access(struct file *file)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
atomic_set(&inode->i_writecount, 1);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/* mode:
|
|
* 0 - completely stop and dis-assemble array
|
|
* 1 - switch to readonly
|
|
* 2 - stop but do not disassemble array
|
|
*/
|
|
static int do_md_stop(mddev_t * mddev, int mode)
|
|
{
|
|
int err = 0;
|
|
struct gendisk *disk = mddev->gendisk;
|
|
|
|
if (mddev->pers) {
|
|
if (atomic_read(&mddev->active)>2) {
|
|
printk("md: %s still in use.\n",mdname(mddev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (mddev->sync_thread) {
|
|
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
md_unregister_thread(mddev->sync_thread);
|
|
mddev->sync_thread = NULL;
|
|
}
|
|
|
|
del_timer_sync(&mddev->safemode_timer);
|
|
|
|
invalidate_partition(disk, 0);
|
|
|
|
switch(mode) {
|
|
case 1: /* readonly */
|
|
err = -ENXIO;
|
|
if (mddev->ro==1)
|
|
goto out;
|
|
mddev->ro = 1;
|
|
break;
|
|
case 0: /* disassemble */
|
|
case 2: /* stop */
|
|
bitmap_flush(mddev);
|
|
md_super_wait(mddev);
|
|
if (mddev->ro)
|
|
set_disk_ro(disk, 0);
|
|
blk_queue_make_request(mddev->queue, md_fail_request);
|
|
mddev->pers->stop(mddev);
|
|
mddev->queue->merge_bvec_fn = NULL;
|
|
mddev->queue->unplug_fn = NULL;
|
|
mddev->queue->issue_flush_fn = NULL;
|
|
mddev->queue->backing_dev_info.congested_fn = NULL;
|
|
if (mddev->pers->sync_request)
|
|
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
|
|
|
|
module_put(mddev->pers->owner);
|
|
mddev->pers = NULL;
|
|
|
|
set_capacity(disk, 0);
|
|
mddev->changed = 1;
|
|
|
|
if (mddev->ro)
|
|
mddev->ro = 0;
|
|
}
|
|
if (!mddev->in_sync || mddev->flags) {
|
|
/* mark array as shutdown cleanly */
|
|
mddev->in_sync = 1;
|
|
md_update_sb(mddev, 1);
|
|
}
|
|
if (mode == 1)
|
|
set_disk_ro(disk, 1);
|
|
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
|
|
}
|
|
|
|
/*
|
|
* Free resources if final stop
|
|
*/
|
|
if (mode == 0) {
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
|
|
|
|
bitmap_destroy(mddev);
|
|
if (mddev->bitmap_file) {
|
|
restore_bitmap_write_access(mddev->bitmap_file);
|
|
fput(mddev->bitmap_file);
|
|
mddev->bitmap_file = NULL;
|
|
}
|
|
mddev->bitmap_offset = 0;
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp)
|
|
if (rdev->raid_disk >= 0) {
|
|
char nm[20];
|
|
sprintf(nm, "rd%d", rdev->raid_disk);
|
|
sysfs_remove_link(&mddev->kobj, nm);
|
|
}
|
|
|
|
/* make sure all delayed_delete calls have finished */
|
|
flush_scheduled_work();
|
|
|
|
export_array(mddev);
|
|
|
|
mddev->array_size = 0;
|
|
mddev->size = 0;
|
|
mddev->raid_disks = 0;
|
|
mddev->recovery_cp = 0;
|
|
mddev->reshape_position = MaxSector;
|
|
|
|
} else if (mddev->pers)
|
|
printk(KERN_INFO "md: %s switched to read-only mode.\n",
|
|
mdname(mddev));
|
|
err = 0;
|
|
md_new_event(mddev);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
#ifndef MODULE
|
|
static void autorun_array(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
int err;
|
|
|
|
if (list_empty(&mddev->disks))
|
|
return;
|
|
|
|
printk(KERN_INFO "md: running: ");
|
|
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
printk("<%s>", bdevname(rdev->bdev,b));
|
|
}
|
|
printk("\n");
|
|
|
|
err = do_md_run (mddev);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
|
|
do_md_stop (mddev, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lets try to run arrays based on all disks that have arrived
|
|
* until now. (those are in pending_raid_disks)
|
|
*
|
|
* the method: pick the first pending disk, collect all disks with
|
|
* the same UUID, remove all from the pending list and put them into
|
|
* the 'same_array' list. Then order this list based on superblock
|
|
* update time (freshest comes first), kick out 'old' disks and
|
|
* compare superblocks. If everything's fine then run it.
|
|
*
|
|
* If "unit" is allocated, then bump its reference count
|
|
*/
|
|
static void autorun_devices(int part)
|
|
{
|
|
struct list_head *tmp;
|
|
mdk_rdev_t *rdev0, *rdev;
|
|
mddev_t *mddev;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
printk(KERN_INFO "md: autorun ...\n");
|
|
while (!list_empty(&pending_raid_disks)) {
|
|
int unit;
|
|
dev_t dev;
|
|
LIST_HEAD(candidates);
|
|
rdev0 = list_entry(pending_raid_disks.next,
|
|
mdk_rdev_t, same_set);
|
|
|
|
printk(KERN_INFO "md: considering %s ...\n",
|
|
bdevname(rdev0->bdev,b));
|
|
INIT_LIST_HEAD(&candidates);
|
|
ITERATE_RDEV_PENDING(rdev,tmp)
|
|
if (super_90_load(rdev, rdev0, 0) >= 0) {
|
|
printk(KERN_INFO "md: adding %s ...\n",
|
|
bdevname(rdev->bdev,b));
|
|
list_move(&rdev->same_set, &candidates);
|
|
}
|
|
/*
|
|
* now we have a set of devices, with all of them having
|
|
* mostly sane superblocks. It's time to allocate the
|
|
* mddev.
|
|
*/
|
|
if (part) {
|
|
dev = MKDEV(mdp_major,
|
|
rdev0->preferred_minor << MdpMinorShift);
|
|
unit = MINOR(dev) >> MdpMinorShift;
|
|
} else {
|
|
dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
|
|
unit = MINOR(dev);
|
|
}
|
|
if (rdev0->preferred_minor != unit) {
|
|
printk(KERN_INFO "md: unit number in %s is bad: %d\n",
|
|
bdevname(rdev0->bdev, b), rdev0->preferred_minor);
|
|
break;
|
|
}
|
|
|
|
md_probe(dev, NULL, NULL);
|
|
mddev = mddev_find(dev);
|
|
if (!mddev) {
|
|
printk(KERN_ERR
|
|
"md: cannot allocate memory for md drive.\n");
|
|
break;
|
|
}
|
|
if (mddev_lock(mddev))
|
|
printk(KERN_WARNING "md: %s locked, cannot run\n",
|
|
mdname(mddev));
|
|
else if (mddev->raid_disks || mddev->major_version
|
|
|| !list_empty(&mddev->disks)) {
|
|
printk(KERN_WARNING
|
|
"md: %s already running, cannot run %s\n",
|
|
mdname(mddev), bdevname(rdev0->bdev,b));
|
|
mddev_unlock(mddev);
|
|
} else {
|
|
printk(KERN_INFO "md: created %s\n", mdname(mddev));
|
|
ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
|
|
list_del_init(&rdev->same_set);
|
|
if (bind_rdev_to_array(rdev, mddev))
|
|
export_rdev(rdev);
|
|
}
|
|
autorun_array(mddev);
|
|
mddev_unlock(mddev);
|
|
}
|
|
/* on success, candidates will be empty, on error
|
|
* it won't...
|
|
*/
|
|
ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
|
|
export_rdev(rdev);
|
|
mddev_put(mddev);
|
|
}
|
|
printk(KERN_INFO "md: ... autorun DONE.\n");
|
|
}
|
|
#endif /* !MODULE */
|
|
|
|
static int get_version(void __user * arg)
|
|
{
|
|
mdu_version_t ver;
|
|
|
|
ver.major = MD_MAJOR_VERSION;
|
|
ver.minor = MD_MINOR_VERSION;
|
|
ver.patchlevel = MD_PATCHLEVEL_VERSION;
|
|
|
|
if (copy_to_user(arg, &ver, sizeof(ver)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_array_info(mddev_t * mddev, void __user * arg)
|
|
{
|
|
mdu_array_info_t info;
|
|
int nr,working,active,failed,spare;
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
nr=working=active=failed=spare=0;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
nr++;
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
failed++;
|
|
else {
|
|
working++;
|
|
if (test_bit(In_sync, &rdev->flags))
|
|
active++;
|
|
else
|
|
spare++;
|
|
}
|
|
}
|
|
|
|
info.major_version = mddev->major_version;
|
|
info.minor_version = mddev->minor_version;
|
|
info.patch_version = MD_PATCHLEVEL_VERSION;
|
|
info.ctime = mddev->ctime;
|
|
info.level = mddev->level;
|
|
info.size = mddev->size;
|
|
if (info.size != mddev->size) /* overflow */
|
|
info.size = -1;
|
|
info.nr_disks = nr;
|
|
info.raid_disks = mddev->raid_disks;
|
|
info.md_minor = mddev->md_minor;
|
|
info.not_persistent= !mddev->persistent;
|
|
|
|
info.utime = mddev->utime;
|
|
info.state = 0;
|
|
if (mddev->in_sync)
|
|
info.state = (1<<MD_SB_CLEAN);
|
|
if (mddev->bitmap && mddev->bitmap_offset)
|
|
info.state = (1<<MD_SB_BITMAP_PRESENT);
|
|
info.active_disks = active;
|
|
info.working_disks = working;
|
|
info.failed_disks = failed;
|
|
info.spare_disks = spare;
|
|
|
|
info.layout = mddev->layout;
|
|
info.chunk_size = mddev->chunk_size;
|
|
|
|
if (copy_to_user(arg, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_bitmap_file(mddev_t * mddev, void __user * arg)
|
|
{
|
|
mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
|
|
char *ptr, *buf = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
md_allow_write(mddev);
|
|
|
|
file = kmalloc(sizeof(*file), GFP_KERNEL);
|
|
if (!file)
|
|
goto out;
|
|
|
|
/* bitmap disabled, zero the first byte and copy out */
|
|
if (!mddev->bitmap || !mddev->bitmap->file) {
|
|
file->pathname[0] = '\0';
|
|
goto copy_out;
|
|
}
|
|
|
|
buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
|
|
if (!buf)
|
|
goto out;
|
|
|
|
ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
|
|
if (!ptr)
|
|
goto out;
|
|
|
|
strcpy(file->pathname, ptr);
|
|
|
|
copy_out:
|
|
err = 0;
|
|
if (copy_to_user(arg, file, sizeof(*file)))
|
|
err = -EFAULT;
|
|
out:
|
|
kfree(buf);
|
|
kfree(file);
|
|
return err;
|
|
}
|
|
|
|
static int get_disk_info(mddev_t * mddev, void __user * arg)
|
|
{
|
|
mdu_disk_info_t info;
|
|
unsigned int nr;
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (copy_from_user(&info, arg, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
nr = info.number;
|
|
|
|
rdev = find_rdev_nr(mddev, nr);
|
|
if (rdev) {
|
|
info.major = MAJOR(rdev->bdev->bd_dev);
|
|
info.minor = MINOR(rdev->bdev->bd_dev);
|
|
info.raid_disk = rdev->raid_disk;
|
|
info.state = 0;
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
info.state |= (1<<MD_DISK_FAULTY);
|
|
else if (test_bit(In_sync, &rdev->flags)) {
|
|
info.state |= (1<<MD_DISK_ACTIVE);
|
|
info.state |= (1<<MD_DISK_SYNC);
|
|
}
|
|
if (test_bit(WriteMostly, &rdev->flags))
|
|
info.state |= (1<<MD_DISK_WRITEMOSTLY);
|
|
} else {
|
|
info.major = info.minor = 0;
|
|
info.raid_disk = -1;
|
|
info.state = (1<<MD_DISK_REMOVED);
|
|
}
|
|
|
|
if (copy_to_user(arg, &info, sizeof(info)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
|
|
{
|
|
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
|
|
mdk_rdev_t *rdev;
|
|
dev_t dev = MKDEV(info->major,info->minor);
|
|
|
|
if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
|
|
return -EOVERFLOW;
|
|
|
|
if (!mddev->raid_disks) {
|
|
int err;
|
|
/* expecting a device which has a superblock */
|
|
rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: md_import_device returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
if (!list_empty(&mddev->disks)) {
|
|
mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
|
|
mdk_rdev_t, same_set);
|
|
int err = super_types[mddev->major_version]
|
|
.load_super(rdev, rdev0, mddev->minor_version);
|
|
if (err < 0) {
|
|
printk(KERN_WARNING
|
|
"md: %s has different UUID to %s\n",
|
|
bdevname(rdev->bdev,b),
|
|
bdevname(rdev0->bdev,b2));
|
|
export_rdev(rdev);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err)
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* add_new_disk can be used once the array is assembled
|
|
* to add "hot spares". They must already have a superblock
|
|
* written
|
|
*/
|
|
if (mddev->pers) {
|
|
int err;
|
|
if (!mddev->pers->hot_add_disk) {
|
|
printk(KERN_WARNING
|
|
"%s: personality does not support diskops!\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
if (mddev->persistent)
|
|
rdev = md_import_device(dev, mddev->major_version,
|
|
mddev->minor_version);
|
|
else
|
|
rdev = md_import_device(dev, -1, -1);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: md_import_device returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
/* set save_raid_disk if appropriate */
|
|
if (!mddev->persistent) {
|
|
if (info->state & (1<<MD_DISK_SYNC) &&
|
|
info->raid_disk < mddev->raid_disks)
|
|
rdev->raid_disk = info->raid_disk;
|
|
else
|
|
rdev->raid_disk = -1;
|
|
} else
|
|
super_types[mddev->major_version].
|
|
validate_super(mddev, rdev);
|
|
rdev->saved_raid_disk = rdev->raid_disk;
|
|
|
|
clear_bit(In_sync, &rdev->flags); /* just to be sure */
|
|
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
|
|
set_bit(WriteMostly, &rdev->flags);
|
|
|
|
rdev->raid_disk = -1;
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (!err && !mddev->pers->hot_remove_disk) {
|
|
/* If there is hot_add_disk but no hot_remove_disk
|
|
* then added disks for geometry changes,
|
|
* and should be added immediately.
|
|
*/
|
|
super_types[mddev->major_version].
|
|
validate_super(mddev, rdev);
|
|
err = mddev->pers->hot_add_disk(mddev, rdev);
|
|
if (err)
|
|
unbind_rdev_from_array(rdev);
|
|
}
|
|
if (err)
|
|
export_rdev(rdev);
|
|
|
|
md_update_sb(mddev, 1);
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
return err;
|
|
}
|
|
|
|
/* otherwise, add_new_disk is only allowed
|
|
* for major_version==0 superblocks
|
|
*/
|
|
if (mddev->major_version != 0) {
|
|
printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!(info->state & (1<<MD_DISK_FAULTY))) {
|
|
int err;
|
|
rdev = md_import_device (dev, -1, 0);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: error, md_import_device() returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
rdev->desc_nr = info->number;
|
|
if (info->raid_disk < mddev->raid_disks)
|
|
rdev->raid_disk = info->raid_disk;
|
|
else
|
|
rdev->raid_disk = -1;
|
|
|
|
rdev->flags = 0;
|
|
|
|
if (rdev->raid_disk < mddev->raid_disks)
|
|
if (info->state & (1<<MD_DISK_SYNC))
|
|
set_bit(In_sync, &rdev->flags);
|
|
|
|
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
|
|
set_bit(WriteMostly, &rdev->flags);
|
|
|
|
if (!mddev->persistent) {
|
|
printk(KERN_INFO "md: nonpersistent superblock ...\n");
|
|
rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
} else
|
|
rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
|
|
rdev->size = calc_dev_size(rdev, mddev->chunk_size);
|
|
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err) {
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hot_remove_disk(mddev_t * mddev, dev_t dev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (!mddev->pers)
|
|
return -ENODEV;
|
|
|
|
rdev = find_rdev(mddev, dev);
|
|
if (!rdev)
|
|
return -ENXIO;
|
|
|
|
if (rdev->raid_disk >= 0)
|
|
goto busy;
|
|
|
|
kick_rdev_from_array(rdev);
|
|
md_update_sb(mddev, 1);
|
|
md_new_event(mddev);
|
|
|
|
return 0;
|
|
busy:
|
|
printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
|
|
bdevname(rdev->bdev,b), mdname(mddev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int hot_add_disk(mddev_t * mddev, dev_t dev)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
int err;
|
|
unsigned int size;
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (!mddev->pers)
|
|
return -ENODEV;
|
|
|
|
if (mddev->major_version != 0) {
|
|
printk(KERN_WARNING "%s: HOT_ADD may only be used with"
|
|
" version-0 superblocks.\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
if (!mddev->pers->hot_add_disk) {
|
|
printk(KERN_WARNING
|
|
"%s: personality does not support diskops!\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
rdev = md_import_device (dev, -1, 0);
|
|
if (IS_ERR(rdev)) {
|
|
printk(KERN_WARNING
|
|
"md: error, md_import_device() returned %ld\n",
|
|
PTR_ERR(rdev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (mddev->persistent)
|
|
rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
|
|
else
|
|
rdev->sb_offset =
|
|
rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
|
|
|
|
size = calc_dev_size(rdev, mddev->chunk_size);
|
|
rdev->size = size;
|
|
|
|
if (test_bit(Faulty, &rdev->flags)) {
|
|
printk(KERN_WARNING
|
|
"md: can not hot-add faulty %s disk to %s!\n",
|
|
bdevname(rdev->bdev,b), mdname(mddev));
|
|
err = -EINVAL;
|
|
goto abort_export;
|
|
}
|
|
clear_bit(In_sync, &rdev->flags);
|
|
rdev->desc_nr = -1;
|
|
rdev->saved_raid_disk = -1;
|
|
err = bind_rdev_to_array(rdev, mddev);
|
|
if (err)
|
|
goto abort_export;
|
|
|
|
/*
|
|
* The rest should better be atomic, we can have disk failures
|
|
* noticed in interrupt contexts ...
|
|
*/
|
|
|
|
if (rdev->desc_nr == mddev->max_disks) {
|
|
printk(KERN_WARNING "%s: can not hot-add to full array!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unbind_export;
|
|
}
|
|
|
|
rdev->raid_disk = -1;
|
|
|
|
md_update_sb(mddev, 1);
|
|
|
|
/*
|
|
* Kick recovery, maybe this spare has to be added to the
|
|
* array immediately.
|
|
*/
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
md_new_event(mddev);
|
|
return 0;
|
|
|
|
abort_unbind_export:
|
|
unbind_rdev_from_array(rdev);
|
|
|
|
abort_export:
|
|
export_rdev(rdev);
|
|
return err;
|
|
}
|
|
|
|
static int set_bitmap_file(mddev_t *mddev, int fd)
|
|
{
|
|
int err;
|
|
|
|
if (mddev->pers) {
|
|
if (!mddev->pers->quiesce)
|
|
return -EBUSY;
|
|
if (mddev->recovery || mddev->sync_thread)
|
|
return -EBUSY;
|
|
/* we should be able to change the bitmap.. */
|
|
}
|
|
|
|
|
|
if (fd >= 0) {
|
|
if (mddev->bitmap)
|
|
return -EEXIST; /* cannot add when bitmap is present */
|
|
mddev->bitmap_file = fget(fd);
|
|
|
|
if (mddev->bitmap_file == NULL) {
|
|
printk(KERN_ERR "%s: error: failed to get bitmap file\n",
|
|
mdname(mddev));
|
|
return -EBADF;
|
|
}
|
|
|
|
err = deny_bitmap_write_access(mddev->bitmap_file);
|
|
if (err) {
|
|
printk(KERN_ERR "%s: error: bitmap file is already in use\n",
|
|
mdname(mddev));
|
|
fput(mddev->bitmap_file);
|
|
mddev->bitmap_file = NULL;
|
|
return err;
|
|
}
|
|
mddev->bitmap_offset = 0; /* file overrides offset */
|
|
} else if (mddev->bitmap == NULL)
|
|
return -ENOENT; /* cannot remove what isn't there */
|
|
err = 0;
|
|
if (mddev->pers) {
|
|
mddev->pers->quiesce(mddev, 1);
|
|
if (fd >= 0)
|
|
err = bitmap_create(mddev);
|
|
if (fd < 0 || err) {
|
|
bitmap_destroy(mddev);
|
|
fd = -1; /* make sure to put the file */
|
|
}
|
|
mddev->pers->quiesce(mddev, 0);
|
|
}
|
|
if (fd < 0) {
|
|
if (mddev->bitmap_file) {
|
|
restore_bitmap_write_access(mddev->bitmap_file);
|
|
fput(mddev->bitmap_file);
|
|
}
|
|
mddev->bitmap_file = NULL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* set_array_info is used two different ways
|
|
* The original usage is when creating a new array.
|
|
* In this usage, raid_disks is > 0 and it together with
|
|
* level, size, not_persistent,layout,chunksize determine the
|
|
* shape of the array.
|
|
* This will always create an array with a type-0.90.0 superblock.
|
|
* The newer usage is when assembling an array.
|
|
* In this case raid_disks will be 0, and the major_version field is
|
|
* use to determine which style super-blocks are to be found on the devices.
|
|
* The minor and patch _version numbers are also kept incase the
|
|
* super_block handler wishes to interpret them.
|
|
*/
|
|
static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
|
|
{
|
|
|
|
if (info->raid_disks == 0) {
|
|
/* just setting version number for superblock loading */
|
|
if (info->major_version < 0 ||
|
|
info->major_version >= ARRAY_SIZE(super_types) ||
|
|
super_types[info->major_version].name == NULL) {
|
|
/* maybe try to auto-load a module? */
|
|
printk(KERN_INFO
|
|
"md: superblock version %d not known\n",
|
|
info->major_version);
|
|
return -EINVAL;
|
|
}
|
|
mddev->major_version = info->major_version;
|
|
mddev->minor_version = info->minor_version;
|
|
mddev->patch_version = info->patch_version;
|
|
mddev->persistent = !info->not_persistent;
|
|
return 0;
|
|
}
|
|
mddev->major_version = MD_MAJOR_VERSION;
|
|
mddev->minor_version = MD_MINOR_VERSION;
|
|
mddev->patch_version = MD_PATCHLEVEL_VERSION;
|
|
mddev->ctime = get_seconds();
|
|
|
|
mddev->level = info->level;
|
|
mddev->clevel[0] = 0;
|
|
mddev->size = info->size;
|
|
mddev->raid_disks = info->raid_disks;
|
|
/* don't set md_minor, it is determined by which /dev/md* was
|
|
* openned
|
|
*/
|
|
if (info->state & (1<<MD_SB_CLEAN))
|
|
mddev->recovery_cp = MaxSector;
|
|
else
|
|
mddev->recovery_cp = 0;
|
|
mddev->persistent = ! info->not_persistent;
|
|
|
|
mddev->layout = info->layout;
|
|
mddev->chunk_size = info->chunk_size;
|
|
|
|
mddev->max_disks = MD_SB_DISKS;
|
|
|
|
mddev->flags = 0;
|
|
set_bit(MD_CHANGE_DEVS, &mddev->flags);
|
|
|
|
mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
|
|
mddev->bitmap_offset = 0;
|
|
|
|
mddev->reshape_position = MaxSector;
|
|
|
|
/*
|
|
* Generate a 128 bit UUID
|
|
*/
|
|
get_random_bytes(mddev->uuid, 16);
|
|
|
|
mddev->new_level = mddev->level;
|
|
mddev->new_chunk = mddev->chunk_size;
|
|
mddev->new_layout = mddev->layout;
|
|
mddev->delta_disks = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int update_size(mddev_t *mddev, unsigned long size)
|
|
{
|
|
mdk_rdev_t * rdev;
|
|
int rv;
|
|
struct list_head *tmp;
|
|
int fit = (size == 0);
|
|
|
|
if (mddev->pers->resize == NULL)
|
|
return -EINVAL;
|
|
/* The "size" is the amount of each device that is used.
|
|
* This can only make sense for arrays with redundancy.
|
|
* linear and raid0 always use whatever space is available
|
|
* We can only consider changing the size if no resync
|
|
* or reconstruction is happening, and if the new size
|
|
* is acceptable. It must fit before the sb_offset or,
|
|
* if that is <data_offset, it must fit before the
|
|
* size of each device.
|
|
* If size is zero, we find the largest size that fits.
|
|
*/
|
|
if (mddev->sync_thread)
|
|
return -EBUSY;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
sector_t avail;
|
|
avail = rdev->size * 2;
|
|
|
|
if (fit && (size == 0 || size > avail/2))
|
|
size = avail/2;
|
|
if (avail < ((sector_t)size << 1))
|
|
return -ENOSPC;
|
|
}
|
|
rv = mddev->pers->resize(mddev, (sector_t)size *2);
|
|
if (!rv) {
|
|
struct block_device *bdev;
|
|
|
|
bdev = bdget_disk(mddev->gendisk, 0);
|
|
if (bdev) {
|
|
mutex_lock(&bdev->bd_inode->i_mutex);
|
|
i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
|
|
mutex_unlock(&bdev->bd_inode->i_mutex);
|
|
bdput(bdev);
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static int update_raid_disks(mddev_t *mddev, int raid_disks)
|
|
{
|
|
int rv;
|
|
/* change the number of raid disks */
|
|
if (mddev->pers->check_reshape == NULL)
|
|
return -EINVAL;
|
|
if (raid_disks <= 0 ||
|
|
raid_disks >= mddev->max_disks)
|
|
return -EINVAL;
|
|
if (mddev->sync_thread || mddev->reshape_position != MaxSector)
|
|
return -EBUSY;
|
|
mddev->delta_disks = raid_disks - mddev->raid_disks;
|
|
|
|
rv = mddev->pers->check_reshape(mddev);
|
|
return rv;
|
|
}
|
|
|
|
|
|
/*
|
|
* update_array_info is used to change the configuration of an
|
|
* on-line array.
|
|
* The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
|
|
* fields in the info are checked against the array.
|
|
* Any differences that cannot be handled will cause an error.
|
|
* Normally, only one change can be managed at a time.
|
|
*/
|
|
static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
|
|
{
|
|
int rv = 0;
|
|
int cnt = 0;
|
|
int state = 0;
|
|
|
|
/* calculate expected state,ignoring low bits */
|
|
if (mddev->bitmap && mddev->bitmap_offset)
|
|
state |= (1 << MD_SB_BITMAP_PRESENT);
|
|
|
|
if (mddev->major_version != info->major_version ||
|
|
mddev->minor_version != info->minor_version ||
|
|
/* mddev->patch_version != info->patch_version || */
|
|
mddev->ctime != info->ctime ||
|
|
mddev->level != info->level ||
|
|
/* mddev->layout != info->layout || */
|
|
!mddev->persistent != info->not_persistent||
|
|
mddev->chunk_size != info->chunk_size ||
|
|
/* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
|
|
((state^info->state) & 0xfffffe00)
|
|
)
|
|
return -EINVAL;
|
|
/* Check there is only one change */
|
|
if (info->size >= 0 && mddev->size != info->size) cnt++;
|
|
if (mddev->raid_disks != info->raid_disks) cnt++;
|
|
if (mddev->layout != info->layout) cnt++;
|
|
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
|
|
if (cnt == 0) return 0;
|
|
if (cnt > 1) return -EINVAL;
|
|
|
|
if (mddev->layout != info->layout) {
|
|
/* Change layout
|
|
* we don't need to do anything at the md level, the
|
|
* personality will take care of it all.
|
|
*/
|
|
if (mddev->pers->reconfig == NULL)
|
|
return -EINVAL;
|
|
else
|
|
return mddev->pers->reconfig(mddev, info->layout, -1);
|
|
}
|
|
if (info->size >= 0 && mddev->size != info->size)
|
|
rv = update_size(mddev, info->size);
|
|
|
|
if (mddev->raid_disks != info->raid_disks)
|
|
rv = update_raid_disks(mddev, info->raid_disks);
|
|
|
|
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
|
|
if (mddev->pers->quiesce == NULL)
|
|
return -EINVAL;
|
|
if (mddev->recovery || mddev->sync_thread)
|
|
return -EBUSY;
|
|
if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
|
|
/* add the bitmap */
|
|
if (mddev->bitmap)
|
|
return -EEXIST;
|
|
if (mddev->default_bitmap_offset == 0)
|
|
return -EINVAL;
|
|
mddev->bitmap_offset = mddev->default_bitmap_offset;
|
|
mddev->pers->quiesce(mddev, 1);
|
|
rv = bitmap_create(mddev);
|
|
if (rv)
|
|
bitmap_destroy(mddev);
|
|
mddev->pers->quiesce(mddev, 0);
|
|
} else {
|
|
/* remove the bitmap */
|
|
if (!mddev->bitmap)
|
|
return -ENOENT;
|
|
if (mddev->bitmap->file)
|
|
return -EINVAL;
|
|
mddev->pers->quiesce(mddev, 1);
|
|
bitmap_destroy(mddev);
|
|
mddev->pers->quiesce(mddev, 0);
|
|
mddev->bitmap_offset = 0;
|
|
}
|
|
}
|
|
md_update_sb(mddev, 1);
|
|
return rv;
|
|
}
|
|
|
|
static int set_disk_faulty(mddev_t *mddev, dev_t dev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
|
|
if (mddev->pers == NULL)
|
|
return -ENODEV;
|
|
|
|
rdev = find_rdev(mddev, dev);
|
|
if (!rdev)
|
|
return -ENODEV;
|
|
|
|
md_error(mddev, rdev);
|
|
return 0;
|
|
}
|
|
|
|
static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
mddev_t *mddev = bdev->bd_disk->private_data;
|
|
|
|
geo->heads = 2;
|
|
geo->sectors = 4;
|
|
geo->cylinders = get_capacity(mddev->gendisk) / 8;
|
|
return 0;
|
|
}
|
|
|
|
static int md_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
void __user *argp = (void __user *)arg;
|
|
mddev_t *mddev = NULL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
|
|
/*
|
|
* Commands dealing with the RAID driver but not any
|
|
* particular array:
|
|
*/
|
|
switch (cmd)
|
|
{
|
|
case RAID_VERSION:
|
|
err = get_version(argp);
|
|
goto done;
|
|
|
|
case PRINT_RAID_DEBUG:
|
|
err = 0;
|
|
md_print_devices();
|
|
goto done;
|
|
|
|
#ifndef MODULE
|
|
case RAID_AUTORUN:
|
|
err = 0;
|
|
autostart_arrays(arg);
|
|
goto done;
|
|
#endif
|
|
default:;
|
|
}
|
|
|
|
/*
|
|
* Commands creating/starting a new array:
|
|
*/
|
|
|
|
mddev = inode->i_bdev->bd_disk->private_data;
|
|
|
|
if (!mddev) {
|
|
BUG();
|
|
goto abort;
|
|
}
|
|
|
|
err = mddev_lock(mddev);
|
|
if (err) {
|
|
printk(KERN_INFO
|
|
"md: ioctl lock interrupted, reason %d, cmd %d\n",
|
|
err, cmd);
|
|
goto abort;
|
|
}
|
|
|
|
switch (cmd)
|
|
{
|
|
case SET_ARRAY_INFO:
|
|
{
|
|
mdu_array_info_t info;
|
|
if (!arg)
|
|
memset(&info, 0, sizeof(info));
|
|
else if (copy_from_user(&info, argp, sizeof(info))) {
|
|
err = -EFAULT;
|
|
goto abort_unlock;
|
|
}
|
|
if (mddev->pers) {
|
|
err = update_array_info(mddev, &info);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: couldn't update"
|
|
" array info. %d\n", err);
|
|
goto abort_unlock;
|
|
}
|
|
goto done_unlock;
|
|
}
|
|
if (!list_empty(&mddev->disks)) {
|
|
printk(KERN_WARNING
|
|
"md: array %s already has disks!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unlock;
|
|
}
|
|
if (mddev->raid_disks) {
|
|
printk(KERN_WARNING
|
|
"md: array %s already initialised!\n",
|
|
mdname(mddev));
|
|
err = -EBUSY;
|
|
goto abort_unlock;
|
|
}
|
|
err = set_array_info(mddev, &info);
|
|
if (err) {
|
|
printk(KERN_WARNING "md: couldn't set"
|
|
" array info. %d\n", err);
|
|
goto abort_unlock;
|
|
}
|
|
}
|
|
goto done_unlock;
|
|
|
|
default:;
|
|
}
|
|
|
|
/*
|
|
* Commands querying/configuring an existing array:
|
|
*/
|
|
/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
|
|
* RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
|
|
if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
|
|
&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
|
|
&& cmd != GET_BITMAP_FILE) {
|
|
err = -ENODEV;
|
|
goto abort_unlock;
|
|
}
|
|
|
|
/*
|
|
* Commands even a read-only array can execute:
|
|
*/
|
|
switch (cmd)
|
|
{
|
|
case GET_ARRAY_INFO:
|
|
err = get_array_info(mddev, argp);
|
|
goto done_unlock;
|
|
|
|
case GET_BITMAP_FILE:
|
|
err = get_bitmap_file(mddev, argp);
|
|
goto done_unlock;
|
|
|
|
case GET_DISK_INFO:
|
|
err = get_disk_info(mddev, argp);
|
|
goto done_unlock;
|
|
|
|
case RESTART_ARRAY_RW:
|
|
err = restart_array(mddev);
|
|
goto done_unlock;
|
|
|
|
case STOP_ARRAY:
|
|
err = do_md_stop (mddev, 0);
|
|
goto done_unlock;
|
|
|
|
case STOP_ARRAY_RO:
|
|
err = do_md_stop (mddev, 1);
|
|
goto done_unlock;
|
|
|
|
/*
|
|
* We have a problem here : there is no easy way to give a CHS
|
|
* virtual geometry. We currently pretend that we have a 2 heads
|
|
* 4 sectors (with a BIG number of cylinders...). This drives
|
|
* dosfs just mad... ;-)
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* The remaining ioctls are changing the state of the
|
|
* superblock, so we do not allow them on read-only arrays.
|
|
* However non-MD ioctls (e.g. get-size) will still come through
|
|
* here and hit the 'default' below, so only disallow
|
|
* 'md' ioctls, and switch to rw mode if started auto-readonly.
|
|
*/
|
|
if (_IOC_TYPE(cmd) == MD_MAJOR &&
|
|
mddev->ro && mddev->pers) {
|
|
if (mddev->ro == 2) {
|
|
mddev->ro = 0;
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
|
|
} else {
|
|
err = -EROFS;
|
|
goto abort_unlock;
|
|
}
|
|
}
|
|
|
|
switch (cmd)
|
|
{
|
|
case ADD_NEW_DISK:
|
|
{
|
|
mdu_disk_info_t info;
|
|
if (copy_from_user(&info, argp, sizeof(info)))
|
|
err = -EFAULT;
|
|
else
|
|
err = add_new_disk(mddev, &info);
|
|
goto done_unlock;
|
|
}
|
|
|
|
case HOT_REMOVE_DISK:
|
|
err = hot_remove_disk(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case HOT_ADD_DISK:
|
|
err = hot_add_disk(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case SET_DISK_FAULTY:
|
|
err = set_disk_faulty(mddev, new_decode_dev(arg));
|
|
goto done_unlock;
|
|
|
|
case RUN_ARRAY:
|
|
err = do_md_run (mddev);
|
|
goto done_unlock;
|
|
|
|
case SET_BITMAP_FILE:
|
|
err = set_bitmap_file(mddev, (int)arg);
|
|
goto done_unlock;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
goto abort_unlock;
|
|
}
|
|
|
|
done_unlock:
|
|
abort_unlock:
|
|
mddev_unlock(mddev);
|
|
|
|
return err;
|
|
done:
|
|
if (err)
|
|
MD_BUG();
|
|
abort:
|
|
return err;
|
|
}
|
|
|
|
static int md_open(struct inode *inode, struct file *file)
|
|
{
|
|
/*
|
|
* Succeed if we can lock the mddev, which confirms that
|
|
* it isn't being stopped right now.
|
|
*/
|
|
mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
|
|
int err;
|
|
|
|
if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
|
|
goto out;
|
|
|
|
err = 0;
|
|
mddev_get(mddev);
|
|
mddev_unlock(mddev);
|
|
|
|
check_disk_change(inode->i_bdev);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int md_release(struct inode *inode, struct file * file)
|
|
{
|
|
mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
|
|
|
|
BUG_ON(!mddev);
|
|
mddev_put(mddev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int md_media_changed(struct gendisk *disk)
|
|
{
|
|
mddev_t *mddev = disk->private_data;
|
|
|
|
return mddev->changed;
|
|
}
|
|
|
|
static int md_revalidate(struct gendisk *disk)
|
|
{
|
|
mddev_t *mddev = disk->private_data;
|
|
|
|
mddev->changed = 0;
|
|
return 0;
|
|
}
|
|
static struct block_device_operations md_fops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = md_open,
|
|
.release = md_release,
|
|
.ioctl = md_ioctl,
|
|
.getgeo = md_getgeo,
|
|
.media_changed = md_media_changed,
|
|
.revalidate_disk= md_revalidate,
|
|
};
|
|
|
|
static int md_thread(void * arg)
|
|
{
|
|
mdk_thread_t *thread = arg;
|
|
|
|
/*
|
|
* md_thread is a 'system-thread', it's priority should be very
|
|
* high. We avoid resource deadlocks individually in each
|
|
* raid personality. (RAID5 does preallocation) We also use RR and
|
|
* the very same RT priority as kswapd, thus we will never get
|
|
* into a priority inversion deadlock.
|
|
*
|
|
* we definitely have to have equal or higher priority than
|
|
* bdflush, otherwise bdflush will deadlock if there are too
|
|
* many dirty RAID5 blocks.
|
|
*/
|
|
|
|
current->flags |= PF_NOFREEZE;
|
|
allow_signal(SIGKILL);
|
|
while (!kthread_should_stop()) {
|
|
|
|
/* We need to wait INTERRUPTIBLE so that
|
|
* we don't add to the load-average.
|
|
* That means we need to be sure no signals are
|
|
* pending
|
|
*/
|
|
if (signal_pending(current))
|
|
flush_signals(current);
|
|
|
|
wait_event_interruptible_timeout
|
|
(thread->wqueue,
|
|
test_bit(THREAD_WAKEUP, &thread->flags)
|
|
|| kthread_should_stop(),
|
|
thread->timeout);
|
|
|
|
clear_bit(THREAD_WAKEUP, &thread->flags);
|
|
|
|
thread->run(thread->mddev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void md_wakeup_thread(mdk_thread_t *thread)
|
|
{
|
|
if (thread) {
|
|
dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
|
|
set_bit(THREAD_WAKEUP, &thread->flags);
|
|
wake_up(&thread->wqueue);
|
|
}
|
|
}
|
|
|
|
mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
|
|
const char *name)
|
|
{
|
|
mdk_thread_t *thread;
|
|
|
|
thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
|
|
if (!thread)
|
|
return NULL;
|
|
|
|
init_waitqueue_head(&thread->wqueue);
|
|
|
|
thread->run = run;
|
|
thread->mddev = mddev;
|
|
thread->timeout = MAX_SCHEDULE_TIMEOUT;
|
|
thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
|
|
if (IS_ERR(thread->tsk)) {
|
|
kfree(thread);
|
|
return NULL;
|
|
}
|
|
return thread;
|
|
}
|
|
|
|
void md_unregister_thread(mdk_thread_t *thread)
|
|
{
|
|
dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
|
|
|
|
kthread_stop(thread->tsk);
|
|
kfree(thread);
|
|
}
|
|
|
|
void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
|
|
{
|
|
if (!mddev) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
|
|
if (!rdev || test_bit(Faulty, &rdev->flags))
|
|
return;
|
|
/*
|
|
dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
|
|
mdname(mddev),
|
|
MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
|
|
__builtin_return_address(0),__builtin_return_address(1),
|
|
__builtin_return_address(2),__builtin_return_address(3));
|
|
*/
|
|
if (!mddev->pers)
|
|
return;
|
|
if (!mddev->pers->error_handler)
|
|
return;
|
|
mddev->pers->error_handler(mddev,rdev);
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
md_new_event_inintr(mddev);
|
|
}
|
|
|
|
/* seq_file implementation /proc/mdstat */
|
|
|
|
static void status_unused(struct seq_file *seq)
|
|
{
|
|
int i = 0;
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *tmp;
|
|
|
|
seq_printf(seq, "unused devices: ");
|
|
|
|
ITERATE_RDEV_PENDING(rdev,tmp) {
|
|
char b[BDEVNAME_SIZE];
|
|
i++;
|
|
seq_printf(seq, "%s ",
|
|
bdevname(rdev->bdev,b));
|
|
}
|
|
if (!i)
|
|
seq_printf(seq, "<none>");
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
|
|
|
|
static void status_resync(struct seq_file *seq, mddev_t * mddev)
|
|
{
|
|
sector_t max_blocks, resync, res;
|
|
unsigned long dt, db, rt;
|
|
int scale;
|
|
unsigned int per_milli;
|
|
|
|
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
max_blocks = mddev->resync_max_sectors >> 1;
|
|
else
|
|
max_blocks = mddev->size;
|
|
|
|
/*
|
|
* Should not happen.
|
|
*/
|
|
if (!max_blocks) {
|
|
MD_BUG();
|
|
return;
|
|
}
|
|
/* Pick 'scale' such that (resync>>scale)*1000 will fit
|
|
* in a sector_t, and (max_blocks>>scale) will fit in a
|
|
* u32, as those are the requirements for sector_div.
|
|
* Thus 'scale' must be at least 10
|
|
*/
|
|
scale = 10;
|
|
if (sizeof(sector_t) > sizeof(unsigned long)) {
|
|
while ( max_blocks/2 > (1ULL<<(scale+32)))
|
|
scale++;
|
|
}
|
|
res = (resync>>scale)*1000;
|
|
sector_div(res, (u32)((max_blocks>>scale)+1));
|
|
|
|
per_milli = res;
|
|
{
|
|
int i, x = per_milli/50, y = 20-x;
|
|
seq_printf(seq, "[");
|
|
for (i = 0; i < x; i++)
|
|
seq_printf(seq, "=");
|
|
seq_printf(seq, ">");
|
|
for (i = 0; i < y; i++)
|
|
seq_printf(seq, ".");
|
|
seq_printf(seq, "] ");
|
|
}
|
|
seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
|
|
(test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
|
|
"reshape" :
|
|
(test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
|
|
"check" :
|
|
(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
|
|
"resync" : "recovery"))),
|
|
per_milli/10, per_milli % 10,
|
|
(unsigned long long) resync,
|
|
(unsigned long long) max_blocks);
|
|
|
|
/*
|
|
* We do not want to overflow, so the order of operands and
|
|
* the * 100 / 100 trick are important. We do a +1 to be
|
|
* safe against division by zero. We only estimate anyway.
|
|
*
|
|
* dt: time from mark until now
|
|
* db: blocks written from mark until now
|
|
* rt: remaining time
|
|
*/
|
|
dt = ((jiffies - mddev->resync_mark) / HZ);
|
|
if (!dt) dt++;
|
|
db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
|
|
- mddev->resync_mark_cnt;
|
|
rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
|
|
|
|
seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
|
|
|
|
seq_printf(seq, " speed=%ldK/sec", db/2/dt);
|
|
}
|
|
|
|
static void *md_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct list_head *tmp;
|
|
loff_t l = *pos;
|
|
mddev_t *mddev;
|
|
|
|
if (l >= 0x10000)
|
|
return NULL;
|
|
if (!l--)
|
|
/* header */
|
|
return (void*)1;
|
|
|
|
spin_lock(&all_mddevs_lock);
|
|
list_for_each(tmp,&all_mddevs)
|
|
if (!l--) {
|
|
mddev = list_entry(tmp, mddev_t, all_mddevs);
|
|
mddev_get(mddev);
|
|
spin_unlock(&all_mddevs_lock);
|
|
return mddev;
|
|
}
|
|
spin_unlock(&all_mddevs_lock);
|
|
if (!l--)
|
|
return (void*)2;/* tail */
|
|
return NULL;
|
|
}
|
|
|
|
static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct list_head *tmp;
|
|
mddev_t *next_mddev, *mddev = v;
|
|
|
|
++*pos;
|
|
if (v == (void*)2)
|
|
return NULL;
|
|
|
|
spin_lock(&all_mddevs_lock);
|
|
if (v == (void*)1)
|
|
tmp = all_mddevs.next;
|
|
else
|
|
tmp = mddev->all_mddevs.next;
|
|
if (tmp != &all_mddevs)
|
|
next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
|
|
else {
|
|
next_mddev = (void*)2;
|
|
*pos = 0x10000;
|
|
}
|
|
spin_unlock(&all_mddevs_lock);
|
|
|
|
if (v != (void*)1)
|
|
mddev_put(mddev);
|
|
return next_mddev;
|
|
|
|
}
|
|
|
|
static void md_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
mddev_t *mddev = v;
|
|
|
|
if (mddev && v != (void*)1 && v != (void*)2)
|
|
mddev_put(mddev);
|
|
}
|
|
|
|
struct mdstat_info {
|
|
int event;
|
|
};
|
|
|
|
static int md_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
mddev_t *mddev = v;
|
|
sector_t size;
|
|
struct list_head *tmp2;
|
|
mdk_rdev_t *rdev;
|
|
struct mdstat_info *mi = seq->private;
|
|
struct bitmap *bitmap;
|
|
|
|
if (v == (void*)1) {
|
|
struct mdk_personality *pers;
|
|
seq_printf(seq, "Personalities : ");
|
|
spin_lock(&pers_lock);
|
|
list_for_each_entry(pers, &pers_list, list)
|
|
seq_printf(seq, "[%s] ", pers->name);
|
|
|
|
spin_unlock(&pers_lock);
|
|
seq_printf(seq, "\n");
|
|
mi->event = atomic_read(&md_event_count);
|
|
return 0;
|
|
}
|
|
if (v == (void*)2) {
|
|
status_unused(seq);
|
|
return 0;
|
|
}
|
|
|
|
if (mddev_lock(mddev) < 0)
|
|
return -EINTR;
|
|
|
|
if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
|
|
seq_printf(seq, "%s : %sactive", mdname(mddev),
|
|
mddev->pers ? "" : "in");
|
|
if (mddev->pers) {
|
|
if (mddev->ro==1)
|
|
seq_printf(seq, " (read-only)");
|
|
if (mddev->ro==2)
|
|
seq_printf(seq, "(auto-read-only)");
|
|
seq_printf(seq, " %s", mddev->pers->name);
|
|
}
|
|
|
|
size = 0;
|
|
ITERATE_RDEV(mddev,rdev,tmp2) {
|
|
char b[BDEVNAME_SIZE];
|
|
seq_printf(seq, " %s[%d]",
|
|
bdevname(rdev->bdev,b), rdev->desc_nr);
|
|
if (test_bit(WriteMostly, &rdev->flags))
|
|
seq_printf(seq, "(W)");
|
|
if (test_bit(Faulty, &rdev->flags)) {
|
|
seq_printf(seq, "(F)");
|
|
continue;
|
|
} else if (rdev->raid_disk < 0)
|
|
seq_printf(seq, "(S)"); /* spare */
|
|
size += rdev->size;
|
|
}
|
|
|
|
if (!list_empty(&mddev->disks)) {
|
|
if (mddev->pers)
|
|
seq_printf(seq, "\n %llu blocks",
|
|
(unsigned long long)mddev->array_size);
|
|
else
|
|
seq_printf(seq, "\n %llu blocks",
|
|
(unsigned long long)size);
|
|
}
|
|
if (mddev->persistent) {
|
|
if (mddev->major_version != 0 ||
|
|
mddev->minor_version != 90) {
|
|
seq_printf(seq," super %d.%d",
|
|
mddev->major_version,
|
|
mddev->minor_version);
|
|
}
|
|
} else
|
|
seq_printf(seq, " super non-persistent");
|
|
|
|
if (mddev->pers) {
|
|
mddev->pers->status (seq, mddev);
|
|
seq_printf(seq, "\n ");
|
|
if (mddev->pers->sync_request) {
|
|
if (mddev->curr_resync > 2) {
|
|
status_resync (seq, mddev);
|
|
seq_printf(seq, "\n ");
|
|
} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
|
|
seq_printf(seq, "\tresync=DELAYED\n ");
|
|
else if (mddev->recovery_cp < MaxSector)
|
|
seq_printf(seq, "\tresync=PENDING\n ");
|
|
}
|
|
} else
|
|
seq_printf(seq, "\n ");
|
|
|
|
if ((bitmap = mddev->bitmap)) {
|
|
unsigned long chunk_kb;
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&bitmap->lock, flags);
|
|
chunk_kb = bitmap->chunksize >> 10;
|
|
seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
|
|
"%lu%s chunk",
|
|
bitmap->pages - bitmap->missing_pages,
|
|
bitmap->pages,
|
|
(bitmap->pages - bitmap->missing_pages)
|
|
<< (PAGE_SHIFT - 10),
|
|
chunk_kb ? chunk_kb : bitmap->chunksize,
|
|
chunk_kb ? "KB" : "B");
|
|
if (bitmap->file) {
|
|
seq_printf(seq, ", file: ");
|
|
seq_path(seq, bitmap->file->f_path.mnt,
|
|
bitmap->file->f_path.dentry," \t\n");
|
|
}
|
|
|
|
seq_printf(seq, "\n");
|
|
spin_unlock_irqrestore(&bitmap->lock, flags);
|
|
}
|
|
|
|
seq_printf(seq, "\n");
|
|
}
|
|
mddev_unlock(mddev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations md_seq_ops = {
|
|
.start = md_seq_start,
|
|
.next = md_seq_next,
|
|
.stop = md_seq_stop,
|
|
.show = md_seq_show,
|
|
};
|
|
|
|
static int md_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
int error;
|
|
struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
|
|
if (mi == NULL)
|
|
return -ENOMEM;
|
|
|
|
error = seq_open(file, &md_seq_ops);
|
|
if (error)
|
|
kfree(mi);
|
|
else {
|
|
struct seq_file *p = file->private_data;
|
|
p->private = mi;
|
|
mi->event = atomic_read(&md_event_count);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
|
|
{
|
|
struct seq_file *m = filp->private_data;
|
|
struct mdstat_info *mi = m->private;
|
|
int mask;
|
|
|
|
poll_wait(filp, &md_event_waiters, wait);
|
|
|
|
/* always allow read */
|
|
mask = POLLIN | POLLRDNORM;
|
|
|
|
if (mi->event != atomic_read(&md_event_count))
|
|
mask |= POLLERR | POLLPRI;
|
|
return mask;
|
|
}
|
|
|
|
static const struct file_operations md_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = md_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
.poll = mdstat_poll,
|
|
};
|
|
|
|
int register_md_personality(struct mdk_personality *p)
|
|
{
|
|
spin_lock(&pers_lock);
|
|
list_add_tail(&p->list, &pers_list);
|
|
printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
|
|
spin_unlock(&pers_lock);
|
|
return 0;
|
|
}
|
|
|
|
int unregister_md_personality(struct mdk_personality *p)
|
|
{
|
|
printk(KERN_INFO "md: %s personality unregistered\n", p->name);
|
|
spin_lock(&pers_lock);
|
|
list_del_init(&p->list);
|
|
spin_unlock(&pers_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int is_mddev_idle(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t * rdev;
|
|
struct list_head *tmp;
|
|
int idle;
|
|
unsigned long curr_events;
|
|
|
|
idle = 1;
|
|
ITERATE_RDEV(mddev,rdev,tmp) {
|
|
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
|
|
curr_events = disk_stat_read(disk, sectors[0]) +
|
|
disk_stat_read(disk, sectors[1]) -
|
|
atomic_read(&disk->sync_io);
|
|
/* The difference between curr_events and last_events
|
|
* will be affected by any new non-sync IO (making
|
|
* curr_events bigger) and any difference in the amount of
|
|
* in-flight syncio (making current_events bigger or smaller)
|
|
* The amount in-flight is currently limited to
|
|
* 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
|
|
* which is at most 4096 sectors.
|
|
* These numbers are fairly fragile and should be made
|
|
* more robust, probably by enforcing the
|
|
* 'window size' that md_do_sync sort-of uses.
|
|
*
|
|
* Note: the following is an unsigned comparison.
|
|
*/
|
|
if ((long)curr_events - (long)rdev->last_events > 4096) {
|
|
rdev->last_events = curr_events;
|
|
idle = 0;
|
|
}
|
|
}
|
|
return idle;
|
|
}
|
|
|
|
void md_done_sync(mddev_t *mddev, int blocks, int ok)
|
|
{
|
|
/* another "blocks" (512byte) blocks have been synced */
|
|
atomic_sub(blocks, &mddev->recovery_active);
|
|
wake_up(&mddev->recovery_wait);
|
|
if (!ok) {
|
|
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
// stop recovery, signal do_sync ....
|
|
}
|
|
}
|
|
|
|
|
|
/* md_write_start(mddev, bi)
|
|
* If we need to update some array metadata (e.g. 'active' flag
|
|
* in superblock) before writing, schedule a superblock update
|
|
* and wait for it to complete.
|
|
*/
|
|
void md_write_start(mddev_t *mddev, struct bio *bi)
|
|
{
|
|
if (bio_data_dir(bi) != WRITE)
|
|
return;
|
|
|
|
BUG_ON(mddev->ro == 1);
|
|
if (mddev->ro == 2) {
|
|
/* need to switch to read/write */
|
|
mddev->ro = 0;
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
atomic_inc(&mddev->writes_pending);
|
|
if (mddev->in_sync) {
|
|
spin_lock_irq(&mddev->write_lock);
|
|
if (mddev->in_sync) {
|
|
mddev->in_sync = 0;
|
|
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
}
|
|
wait_event(mddev->sb_wait, mddev->flags==0);
|
|
}
|
|
|
|
void md_write_end(mddev_t *mddev)
|
|
{
|
|
if (atomic_dec_and_test(&mddev->writes_pending)) {
|
|
if (mddev->safemode == 2)
|
|
md_wakeup_thread(mddev->thread);
|
|
else if (mddev->safemode_delay)
|
|
mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
|
|
}
|
|
}
|
|
|
|
/* md_allow_write(mddev)
|
|
* Calling this ensures that the array is marked 'active' so that writes
|
|
* may proceed without blocking. It is important to call this before
|
|
* attempting a GFP_KERNEL allocation while holding the mddev lock.
|
|
* Must be called with mddev_lock held.
|
|
*/
|
|
void md_allow_write(mddev_t *mddev)
|
|
{
|
|
if (!mddev->pers)
|
|
return;
|
|
if (mddev->ro)
|
|
return;
|
|
|
|
spin_lock_irq(&mddev->write_lock);
|
|
if (mddev->in_sync) {
|
|
mddev->in_sync = 0;
|
|
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
|
|
if (mddev->safemode_delay &&
|
|
mddev->safemode == 0)
|
|
mddev->safemode = 1;
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
md_update_sb(mddev, 0);
|
|
} else
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(md_allow_write);
|
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
|
|
|
|
#define SYNC_MARKS 10
|
|
#define SYNC_MARK_STEP (3*HZ)
|
|
void md_do_sync(mddev_t *mddev)
|
|
{
|
|
mddev_t *mddev2;
|
|
unsigned int currspeed = 0,
|
|
window;
|
|
sector_t max_sectors,j, io_sectors;
|
|
unsigned long mark[SYNC_MARKS];
|
|
sector_t mark_cnt[SYNC_MARKS];
|
|
int last_mark,m;
|
|
struct list_head *tmp;
|
|
sector_t last_check;
|
|
int skipped = 0;
|
|
struct list_head *rtmp;
|
|
mdk_rdev_t *rdev;
|
|
char *desc;
|
|
|
|
/* just incase thread restarts... */
|
|
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
|
|
return;
|
|
if (mddev->ro) /* never try to sync a read-only array */
|
|
return;
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
|
|
if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
|
|
desc = "data-check";
|
|
else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
|
|
desc = "requested-resync";
|
|
else
|
|
desc = "resync";
|
|
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
|
|
desc = "reshape";
|
|
else
|
|
desc = "recovery";
|
|
|
|
/* we overload curr_resync somewhat here.
|
|
* 0 == not engaged in resync at all
|
|
* 2 == checking that there is no conflict with another sync
|
|
* 1 == like 2, but have yielded to allow conflicting resync to
|
|
* commense
|
|
* other == active in resync - this many blocks
|
|
*
|
|
* Before starting a resync we must have set curr_resync to
|
|
* 2, and then checked that every "conflicting" array has curr_resync
|
|
* less than ours. When we find one that is the same or higher
|
|
* we wait on resync_wait. To avoid deadlock, we reduce curr_resync
|
|
* to 1 if we choose to yield (based arbitrarily on address of mddev structure).
|
|
* This will mean we have to start checking from the beginning again.
|
|
*
|
|
*/
|
|
|
|
do {
|
|
mddev->curr_resync = 2;
|
|
|
|
try_again:
|
|
if (kthread_should_stop()) {
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
goto skip;
|
|
}
|
|
ITERATE_MDDEV(mddev2,tmp) {
|
|
if (mddev2 == mddev)
|
|
continue;
|
|
if (mddev2->curr_resync &&
|
|
match_mddev_units(mddev,mddev2)) {
|
|
DEFINE_WAIT(wq);
|
|
if (mddev < mddev2 && mddev->curr_resync == 2) {
|
|
/* arbitrarily yield */
|
|
mddev->curr_resync = 1;
|
|
wake_up(&resync_wait);
|
|
}
|
|
if (mddev > mddev2 && mddev->curr_resync == 1)
|
|
/* no need to wait here, we can wait the next
|
|
* time 'round when curr_resync == 2
|
|
*/
|
|
continue;
|
|
prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
|
|
if (!kthread_should_stop() &&
|
|
mddev2->curr_resync >= mddev->curr_resync) {
|
|
printk(KERN_INFO "md: delaying %s of %s"
|
|
" until %s has finished (they"
|
|
" share one or more physical units)\n",
|
|
desc, mdname(mddev), mdname(mddev2));
|
|
mddev_put(mddev2);
|
|
schedule();
|
|
finish_wait(&resync_wait, &wq);
|
|
goto try_again;
|
|
}
|
|
finish_wait(&resync_wait, &wq);
|
|
}
|
|
}
|
|
} while (mddev->curr_resync < 2);
|
|
|
|
j = 0;
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
|
|
/* resync follows the size requested by the personality,
|
|
* which defaults to physical size, but can be virtual size
|
|
*/
|
|
max_sectors = mddev->resync_max_sectors;
|
|
mddev->resync_mismatches = 0;
|
|
/* we don't use the checkpoint if there's a bitmap */
|
|
if (!mddev->bitmap &&
|
|
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
|
|
j = mddev->recovery_cp;
|
|
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
|
|
max_sectors = mddev->size << 1;
|
|
else {
|
|
/* recovery follows the physical size of devices */
|
|
max_sectors = mddev->size << 1;
|
|
j = MaxSector;
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk >= 0 &&
|
|
!test_bit(Faulty, &rdev->flags) &&
|
|
!test_bit(In_sync, &rdev->flags) &&
|
|
rdev->recovery_offset < j)
|
|
j = rdev->recovery_offset;
|
|
}
|
|
|
|
printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
|
|
printk(KERN_INFO "md: minimum _guaranteed_ speed:"
|
|
" %d KB/sec/disk.\n", speed_min(mddev));
|
|
printk(KERN_INFO "md: using maximum available idle IO bandwidth "
|
|
"(but not more than %d KB/sec) for %s.\n",
|
|
speed_max(mddev), desc);
|
|
|
|
is_mddev_idle(mddev); /* this also initializes IO event counters */
|
|
|
|
io_sectors = 0;
|
|
for (m = 0; m < SYNC_MARKS; m++) {
|
|
mark[m] = jiffies;
|
|
mark_cnt[m] = io_sectors;
|
|
}
|
|
last_mark = 0;
|
|
mddev->resync_mark = mark[last_mark];
|
|
mddev->resync_mark_cnt = mark_cnt[last_mark];
|
|
|
|
/*
|
|
* Tune reconstruction:
|
|
*/
|
|
window = 32*(PAGE_SIZE/512);
|
|
printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
|
|
window/2,(unsigned long long) max_sectors/2);
|
|
|
|
atomic_set(&mddev->recovery_active, 0);
|
|
init_waitqueue_head(&mddev->recovery_wait);
|
|
last_check = 0;
|
|
|
|
if (j>2) {
|
|
printk(KERN_INFO
|
|
"md: resuming %s of %s from checkpoint.\n",
|
|
desc, mdname(mddev));
|
|
mddev->curr_resync = j;
|
|
}
|
|
|
|
while (j < max_sectors) {
|
|
sector_t sectors;
|
|
|
|
skipped = 0;
|
|
sectors = mddev->pers->sync_request(mddev, j, &skipped,
|
|
currspeed < speed_min(mddev));
|
|
if (sectors == 0) {
|
|
set_bit(MD_RECOVERY_ERR, &mddev->recovery);
|
|
goto out;
|
|
}
|
|
|
|
if (!skipped) { /* actual IO requested */
|
|
io_sectors += sectors;
|
|
atomic_add(sectors, &mddev->recovery_active);
|
|
}
|
|
|
|
j += sectors;
|
|
if (j>1) mddev->curr_resync = j;
|
|
mddev->curr_mark_cnt = io_sectors;
|
|
if (last_check == 0)
|
|
/* this is the earliers that rebuilt will be
|
|
* visible in /proc/mdstat
|
|
*/
|
|
md_new_event(mddev);
|
|
|
|
if (last_check + window > io_sectors || j == max_sectors)
|
|
continue;
|
|
|
|
last_check = io_sectors;
|
|
|
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_ERR, &mddev->recovery))
|
|
break;
|
|
|
|
repeat:
|
|
if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
|
|
/* step marks */
|
|
int next = (last_mark+1) % SYNC_MARKS;
|
|
|
|
mddev->resync_mark = mark[next];
|
|
mddev->resync_mark_cnt = mark_cnt[next];
|
|
mark[next] = jiffies;
|
|
mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
|
|
last_mark = next;
|
|
}
|
|
|
|
|
|
if (kthread_should_stop()) {
|
|
/*
|
|
* got a signal, exit.
|
|
*/
|
|
printk(KERN_INFO
|
|
"md: md_do_sync() got signal ... exiting\n");
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* this loop exits only if either when we are slower than
|
|
* the 'hard' speed limit, or the system was IO-idle for
|
|
* a jiffy.
|
|
* the system might be non-idle CPU-wise, but we only care
|
|
* about not overloading the IO subsystem. (things like an
|
|
* e2fsck being done on the RAID array should execute fast)
|
|
*/
|
|
mddev->queue->unplug_fn(mddev->queue);
|
|
cond_resched();
|
|
|
|
currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
|
|
/((jiffies-mddev->resync_mark)/HZ +1) +1;
|
|
|
|
if (currspeed > speed_min(mddev)) {
|
|
if ((currspeed > speed_max(mddev)) ||
|
|
!is_mddev_idle(mddev)) {
|
|
msleep(500);
|
|
goto repeat;
|
|
}
|
|
}
|
|
}
|
|
printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
|
|
/*
|
|
* this also signals 'finished resyncing' to md_stop
|
|
*/
|
|
out:
|
|
mddev->queue->unplug_fn(mddev->queue);
|
|
|
|
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
|
|
|
|
/* tell personality that we are finished */
|
|
mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
|
|
|
|
if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
|
|
!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
|
|
mddev->curr_resync > 2) {
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
|
|
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
|
|
if (mddev->curr_resync >= mddev->recovery_cp) {
|
|
printk(KERN_INFO
|
|
"md: checkpointing %s of %s.\n",
|
|
desc, mdname(mddev));
|
|
mddev->recovery_cp = mddev->curr_resync;
|
|
}
|
|
} else
|
|
mddev->recovery_cp = MaxSector;
|
|
} else {
|
|
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
|
|
mddev->curr_resync = MaxSector;
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk >= 0 &&
|
|
!test_bit(Faulty, &rdev->flags) &&
|
|
!test_bit(In_sync, &rdev->flags) &&
|
|
rdev->recovery_offset < mddev->curr_resync)
|
|
rdev->recovery_offset = mddev->curr_resync;
|
|
}
|
|
}
|
|
set_bit(MD_CHANGE_DEVS, &mddev->flags);
|
|
|
|
skip:
|
|
mddev->curr_resync = 0;
|
|
wake_up(&resync_wait);
|
|
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
|
|
md_wakeup_thread(mddev->thread);
|
|
}
|
|
EXPORT_SYMBOL_GPL(md_do_sync);
|
|
|
|
|
|
static int remove_and_add_spares(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *rtmp;
|
|
int spares = 0;
|
|
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk >= 0 &&
|
|
(test_bit(Faulty, &rdev->flags) ||
|
|
! test_bit(In_sync, &rdev->flags)) &&
|
|
atomic_read(&rdev->nr_pending)==0) {
|
|
if (mddev->pers->hot_remove_disk(
|
|
mddev, rdev->raid_disk)==0) {
|
|
char nm[20];
|
|
sprintf(nm,"rd%d", rdev->raid_disk);
|
|
sysfs_remove_link(&mddev->kobj, nm);
|
|
rdev->raid_disk = -1;
|
|
}
|
|
}
|
|
|
|
if (mddev->degraded) {
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
if (rdev->raid_disk < 0
|
|
&& !test_bit(Faulty, &rdev->flags)) {
|
|
rdev->recovery_offset = 0;
|
|
if (mddev->pers->hot_add_disk(mddev,rdev)) {
|
|
char nm[20];
|
|
sprintf(nm, "rd%d", rdev->raid_disk);
|
|
if (sysfs_create_link(&mddev->kobj,
|
|
&rdev->kobj, nm))
|
|
printk(KERN_WARNING
|
|
"md: cannot register "
|
|
"%s for %s\n",
|
|
nm, mdname(mddev));
|
|
spares++;
|
|
md_new_event(mddev);
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
return spares;
|
|
}
|
|
/*
|
|
* This routine is regularly called by all per-raid-array threads to
|
|
* deal with generic issues like resync and super-block update.
|
|
* Raid personalities that don't have a thread (linear/raid0) do not
|
|
* need this as they never do any recovery or update the superblock.
|
|
*
|
|
* It does not do any resync itself, but rather "forks" off other threads
|
|
* to do that as needed.
|
|
* When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
|
|
* "->recovery" and create a thread at ->sync_thread.
|
|
* When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
|
|
* and wakeups up this thread which will reap the thread and finish up.
|
|
* This thread also removes any faulty devices (with nr_pending == 0).
|
|
*
|
|
* The overall approach is:
|
|
* 1/ if the superblock needs updating, update it.
|
|
* 2/ If a recovery thread is running, don't do anything else.
|
|
* 3/ If recovery has finished, clean up, possibly marking spares active.
|
|
* 4/ If there are any faulty devices, remove them.
|
|
* 5/ If array is degraded, try to add spares devices
|
|
* 6/ If array has spares or is not in-sync, start a resync thread.
|
|
*/
|
|
void md_check_recovery(mddev_t *mddev)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
struct list_head *rtmp;
|
|
|
|
|
|
if (mddev->bitmap)
|
|
bitmap_daemon_work(mddev->bitmap);
|
|
|
|
if (mddev->ro)
|
|
return;
|
|
|
|
if (signal_pending(current)) {
|
|
if (mddev->pers->sync_request) {
|
|
printk(KERN_INFO "md: %s in immediate safe mode\n",
|
|
mdname(mddev));
|
|
mddev->safemode = 2;
|
|
}
|
|
flush_signals(current);
|
|
}
|
|
|
|
if ( ! (
|
|
mddev->flags ||
|
|
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
|
|
(mddev->safemode == 1) ||
|
|
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
|
|
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
|
|
))
|
|
return;
|
|
|
|
if (mddev_trylock(mddev)) {
|
|
int spares = 0;
|
|
|
|
spin_lock_irq(&mddev->write_lock);
|
|
if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
|
|
!mddev->in_sync && mddev->recovery_cp == MaxSector) {
|
|
mddev->in_sync = 1;
|
|
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
|
|
}
|
|
if (mddev->safemode == 1)
|
|
mddev->safemode = 0;
|
|
spin_unlock_irq(&mddev->write_lock);
|
|
|
|
if (mddev->flags)
|
|
md_update_sb(mddev, 0);
|
|
|
|
|
|
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
|
|
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
|
|
/* resync/recovery still happening */
|
|
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
goto unlock;
|
|
}
|
|
if (mddev->sync_thread) {
|
|
/* resync has finished, collect result */
|
|
md_unregister_thread(mddev->sync_thread);
|
|
mddev->sync_thread = NULL;
|
|
if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
|
|
!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
|
|
/* success...*/
|
|
/* activate any spares */
|
|
mddev->pers->spare_active(mddev);
|
|
}
|
|
md_update_sb(mddev, 1);
|
|
|
|
/* if array is no-longer degraded, then any saved_raid_disk
|
|
* information must be scrapped
|
|
*/
|
|
if (!mddev->degraded)
|
|
ITERATE_RDEV(mddev,rdev,rtmp)
|
|
rdev->saved_raid_disk = -1;
|
|
|
|
mddev->recovery = 0;
|
|
/* flag recovery needed just to double check */
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
md_new_event(mddev);
|
|
goto unlock;
|
|
}
|
|
/* Clear some bits that don't mean anything, but
|
|
* might be left set
|
|
*/
|
|
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
|
|
clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
|
|
|
|
if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
|
|
goto unlock;
|
|
/* no recovery is running.
|
|
* remove any failed drives, then
|
|
* add spares if possible.
|
|
* Spare are also removed and re-added, to allow
|
|
* the personality to fail the re-add.
|
|
*/
|
|
|
|
if (mddev->reshape_position != MaxSector) {
|
|
if (mddev->pers->check_reshape(mddev) != 0)
|
|
/* Cannot proceed */
|
|
goto unlock;
|
|
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
|
|
} else if ((spares = remove_and_add_spares(mddev))) {
|
|
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
|
|
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
|
|
} else if (mddev->recovery_cp < MaxSector) {
|
|
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
|
|
} else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
|
|
/* nothing to be done ... */
|
|
goto unlock;
|
|
|
|
if (mddev->pers->sync_request) {
|
|
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
|
|
if (spares && mddev->bitmap && ! mddev->bitmap->file) {
|
|
/* We are adding a device or devices to an array
|
|
* which has the bitmap stored on all devices.
|
|
* So make sure all bitmap pages get written
|
|
*/
|
|
bitmap_write_all(mddev->bitmap);
|
|
}
|
|
mddev->sync_thread = md_register_thread(md_do_sync,
|
|
mddev,
|
|
"%s_resync");
|
|
if (!mddev->sync_thread) {
|
|
printk(KERN_ERR "%s: could not start resync"
|
|
" thread...\n",
|
|
mdname(mddev));
|
|
/* leave the spares where they are, it shouldn't hurt */
|
|
mddev->recovery = 0;
|
|
} else
|
|
md_wakeup_thread(mddev->sync_thread);
|
|
md_new_event(mddev);
|
|
}
|
|
unlock:
|
|
mddev_unlock(mddev);
|
|
}
|
|
}
|
|
|
|
static int md_notify_reboot(struct notifier_block *this,
|
|
unsigned long code, void *x)
|
|
{
|
|
struct list_head *tmp;
|
|
mddev_t *mddev;
|
|
|
|
if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
|
|
|
|
printk(KERN_INFO "md: stopping all md devices.\n");
|
|
|
|
ITERATE_MDDEV(mddev,tmp)
|
|
if (mddev_trylock(mddev)) {
|
|
do_md_stop (mddev, 1);
|
|
mddev_unlock(mddev);
|
|
}
|
|
/*
|
|
* certain more exotic SCSI devices are known to be
|
|
* volatile wrt too early system reboots. While the
|
|
* right place to handle this issue is the given
|
|
* driver, we do want to have a safe RAID driver ...
|
|
*/
|
|
mdelay(1000*1);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block md_notifier = {
|
|
.notifier_call = md_notify_reboot,
|
|
.next = NULL,
|
|
.priority = INT_MAX, /* before any real devices */
|
|
};
|
|
|
|
static void md_geninit(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
|
|
|
|
p = create_proc_entry("mdstat", S_IRUGO, NULL);
|
|
if (p)
|
|
p->proc_fops = &md_seq_fops;
|
|
}
|
|
|
|
static int __init md_init(void)
|
|
{
|
|
if (register_blkdev(MAJOR_NR, "md"))
|
|
return -1;
|
|
if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
|
|
unregister_blkdev(MAJOR_NR, "md");
|
|
return -1;
|
|
}
|
|
blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
|
|
md_probe, NULL, NULL);
|
|
blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
|
|
md_probe, NULL, NULL);
|
|
|
|
register_reboot_notifier(&md_notifier);
|
|
raid_table_header = register_sysctl_table(raid_root_table);
|
|
|
|
md_geninit();
|
|
return (0);
|
|
}
|
|
|
|
|
|
#ifndef MODULE
|
|
|
|
/*
|
|
* Searches all registered partitions for autorun RAID arrays
|
|
* at boot time.
|
|
*/
|
|
static dev_t detected_devices[128];
|
|
static int dev_cnt;
|
|
|
|
void md_autodetect_dev(dev_t dev)
|
|
{
|
|
if (dev_cnt >= 0 && dev_cnt < 127)
|
|
detected_devices[dev_cnt++] = dev;
|
|
}
|
|
|
|
|
|
static void autostart_arrays(int part)
|
|
{
|
|
mdk_rdev_t *rdev;
|
|
int i;
|
|
|
|
printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
|
|
|
|
for (i = 0; i < dev_cnt; i++) {
|
|
dev_t dev = detected_devices[i];
|
|
|
|
rdev = md_import_device(dev,0, 0);
|
|
if (IS_ERR(rdev))
|
|
continue;
|
|
|
|
if (test_bit(Faulty, &rdev->flags)) {
|
|
MD_BUG();
|
|
continue;
|
|
}
|
|
list_add(&rdev->same_set, &pending_raid_disks);
|
|
}
|
|
dev_cnt = 0;
|
|
|
|
autorun_devices(part);
|
|
}
|
|
|
|
#endif /* !MODULE */
|
|
|
|
static __exit void md_exit(void)
|
|
{
|
|
mddev_t *mddev;
|
|
struct list_head *tmp;
|
|
|
|
blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
|
|
blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
|
|
|
|
unregister_blkdev(MAJOR_NR,"md");
|
|
unregister_blkdev(mdp_major, "mdp");
|
|
unregister_reboot_notifier(&md_notifier);
|
|
unregister_sysctl_table(raid_table_header);
|
|
remove_proc_entry("mdstat", NULL);
|
|
ITERATE_MDDEV(mddev,tmp) {
|
|
struct gendisk *disk = mddev->gendisk;
|
|
if (!disk)
|
|
continue;
|
|
export_array(mddev);
|
|
del_gendisk(disk);
|
|
put_disk(disk);
|
|
mddev->gendisk = NULL;
|
|
mddev_put(mddev);
|
|
}
|
|
}
|
|
|
|
module_init(md_init)
|
|
module_exit(md_exit)
|
|
|
|
static int get_ro(char *buffer, struct kernel_param *kp)
|
|
{
|
|
return sprintf(buffer, "%d", start_readonly);
|
|
}
|
|
static int set_ro(const char *val, struct kernel_param *kp)
|
|
{
|
|
char *e;
|
|
int num = simple_strtoul(val, &e, 10);
|
|
if (*val && (*e == '\0' || *e == '\n')) {
|
|
start_readonly = num;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
|
|
module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
|
|
|
|
|
|
EXPORT_SYMBOL(register_md_personality);
|
|
EXPORT_SYMBOL(unregister_md_personality);
|
|
EXPORT_SYMBOL(md_error);
|
|
EXPORT_SYMBOL(md_done_sync);
|
|
EXPORT_SYMBOL(md_write_start);
|
|
EXPORT_SYMBOL(md_write_end);
|
|
EXPORT_SYMBOL(md_register_thread);
|
|
EXPORT_SYMBOL(md_unregister_thread);
|
|
EXPORT_SYMBOL(md_wakeup_thread);
|
|
EXPORT_SYMBOL(md_check_recovery);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("md");
|
|
MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
|