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4286325b4b
Removes obfuscation that is of little value. Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2919 lines
83 KiB
C
2919 lines
83 KiB
C
/*
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* Copyright (C) 2010-2011 Neil Brown
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* Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "md.h"
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#include "raid1.h"
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#include "raid5.h"
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#include "raid10.h"
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#include "bitmap.h"
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#include <linux/device-mapper.h>
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#define DM_MSG_PREFIX "raid"
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#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
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static bool devices_handle_discard_safely = false;
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/*
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* The following flags are used by dm-raid.c to set up the array state.
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* They must be cleared before md_run is called.
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*/
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#define FirstUse 10 /* rdev flag */
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struct raid_dev {
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/*
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* Two DM devices, one to hold metadata and one to hold the
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* actual data/parity. The reason for this is to not confuse
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* ti->len and give more flexibility in altering size and
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* characteristics.
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*
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* While it is possible for this device to be associated
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* with a different physical device than the data_dev, it
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* is intended for it to be the same.
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* |--------- Physical Device ---------|
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* |- meta_dev -|------ data_dev ------|
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*/
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struct dm_dev *meta_dev;
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struct dm_dev *data_dev;
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struct md_rdev rdev;
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};
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/*
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* Bits for establishing rs->ctr_flags
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*
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* 1 = no flag value
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* 2 = flag with value
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*/
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#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
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#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
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#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
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#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
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#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
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#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
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#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
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#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
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#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
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#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
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#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
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#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
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/* New for v1.9.0 */
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#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid4/5/6/10! */
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#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
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#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
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/*
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* Flags for rs->ctr_flags field.
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*/
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#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
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#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
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#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
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#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
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#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
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#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
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#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
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#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
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#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
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#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
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#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
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#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
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#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
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#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
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#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
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/*
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* Definitions of various constructor flags to
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* be used in checks of valid / invalid flags
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* per raid level.
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*/
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/* Define all any sync flags */
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#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
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/* Define flags for options without argument (e.g. 'nosync') */
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#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
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CTR_FLAG_RAID10_USE_NEAR_SETS)
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/* Define flags for options with one argument (e.g. 'delta_disks +2') */
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#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
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CTR_FLAG_WRITE_MOSTLY | \
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CTR_FLAG_DAEMON_SLEEP | \
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CTR_FLAG_MIN_RECOVERY_RATE | \
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CTR_FLAG_MAX_RECOVERY_RATE | \
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CTR_FLAG_MAX_WRITE_BEHIND | \
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CTR_FLAG_STRIPE_CACHE | \
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CTR_FLAG_REGION_SIZE | \
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CTR_FLAG_RAID10_COPIES | \
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CTR_FLAG_RAID10_FORMAT | \
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CTR_FLAG_DELTA_DISKS | \
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CTR_FLAG_DATA_OFFSET)
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/* All ctr optional arguments */
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#define ALL_CTR_FLAGS (CTR_FLAG_OPTIONS_NO_ARGS | \
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CTR_FLAG_OPTIONS_ONE_ARG)
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/* Invalid options definitions per raid level... */
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/* "raid0" does not accept any options */
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#define RAID0_INVALID_FLAGS ALL_CTR_FLAGS
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/* "raid1" does not accept stripe cache or any raid10 options */
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#define RAID1_INVALID_FLAGS (CTR_FLAG_STRIPE_CACHE | \
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CTR_FLAG_RAID10_COPIES | \
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CTR_FLAG_RAID10_FORMAT | \
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CTR_FLAG_DELTA_DISKS | \
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CTR_FLAG_DATA_OFFSET)
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/* "raid10" does not accept any raid1 or stripe cache options */
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#define RAID10_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \
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CTR_FLAG_MAX_WRITE_BEHIND | \
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CTR_FLAG_STRIPE_CACHE)
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/*
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* "raid4/5/6" do not accept any raid1 or raid10 specific options
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*
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* "raid6" does not accept "nosync", because it is not guaranteed
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* that both parity and q-syndrome are being written properly with
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* any writes
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*/
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#define RAID45_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \
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CTR_FLAG_MAX_WRITE_BEHIND | \
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CTR_FLAG_RAID10_FORMAT | \
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CTR_FLAG_RAID10_COPIES | \
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CTR_FLAG_RAID10_USE_NEAR_SETS)
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#define RAID6_INVALID_FLAGS (CTR_FLAG_NOSYNC | RAID45_INVALID_FLAGS)
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/* ...invalid options definitions per raid level */
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/*
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* Flags for rs->runtime_flags field
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* (RT_FLAG prefix meaning "runtime flag")
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*
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* These are all internal and used to define runtime state,
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* e.g. to prevent another resume from preresume processing
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* the raid set all over again.
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*/
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#define RT_FLAG_RS_PRERESUMED 0x1
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#define RT_FLAG_RS_RESUMED 0x2
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#define RT_FLAG_RS_BITMAP_LOADED 0x4
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#define RT_FLAG_UPDATE_SBS 0x8
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/* Array elements of 64 bit needed for rebuild/write_mostly bits */
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#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
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/*
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* raid set level, layout and chunk sectors backup/restore
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*/
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struct rs_layout {
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int new_level;
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int new_layout;
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int new_chunk_sectors;
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};
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struct raid_set {
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struct dm_target *ti;
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uint32_t bitmap_loaded;
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unsigned long ctr_flags;
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unsigned long runtime_flags;
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uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
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int raid_disks;
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int delta_disks;
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int data_offset;
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int raid10_copies;
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struct mddev md;
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struct raid_type *raid_type;
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struct dm_target_callbacks callbacks;
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struct rs_layout rs_layout;
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struct raid_dev dev[0];
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};
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/* Backup/restore raid set configuration helpers */
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static void _rs_config_backup(struct raid_set *rs, struct rs_layout *l)
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{
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struct mddev *mddev = &rs->md;
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l->new_level = mddev->new_level;
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l->new_layout = mddev->new_layout;
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l->new_chunk_sectors = mddev->new_chunk_sectors;
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}
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static void rs_config_backup(struct raid_set *rs)
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{
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return _rs_config_backup(rs, &rs->rs_layout);
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}
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static void _rs_config_restore(struct raid_set *rs, struct rs_layout *l)
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{
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struct mddev *mddev = &rs->md;
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mddev->new_level = l->new_level;
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mddev->new_layout = l->new_layout;
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mddev->new_chunk_sectors = l->new_chunk_sectors;
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}
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static void rs_config_restore(struct raid_set *rs)
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{
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return _rs_config_restore(rs, &rs->rs_layout);
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}
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/* END: backup/restore raid set configuration helpers */
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/* raid10 algorithms (i.e. formats) */
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#define ALGORITHM_RAID10_DEFAULT 0
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#define ALGORITHM_RAID10_NEAR 1
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#define ALGORITHM_RAID10_OFFSET 2
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#define ALGORITHM_RAID10_FAR 3
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/* Supported raid types and properties. */
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static struct raid_type {
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const char *name; /* RAID algorithm. */
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const char *descr; /* Descriptor text for logging. */
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const unsigned parity_devs; /* # of parity devices. */
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const unsigned minimal_devs; /* minimal # of devices in set. */
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const unsigned level; /* RAID level. */
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const unsigned algorithm; /* RAID algorithm. */
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} raid_types[] = {
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{"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
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{"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
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{"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
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{"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
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{"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
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{"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
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{"raid4", "raid4 (dedicated last parity disk)", 1, 2, 4, ALGORITHM_PARITY_N}, /* raid4 layout = raid5_n */
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{"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
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{"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
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{"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
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{"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
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{"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
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{"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
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{"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
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{"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
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{"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
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{"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
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{"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
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{"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
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{"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
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};
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/* True, if @v is in inclusive range [@min, @max] */
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static bool __within_range(long v, long min, long max)
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{
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return v >= min && v <= max;
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}
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/* All table line arguments are defined here */
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static struct arg_name_flag {
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const unsigned long flag;
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const char *name;
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} _arg_name_flags[] = {
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{ CTR_FLAG_SYNC, "sync"},
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{ CTR_FLAG_NOSYNC, "nosync"},
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{ CTR_FLAG_REBUILD, "rebuild"},
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{ CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
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{ CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
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{ CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
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{ CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
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{ CTR_FLAG_WRITE_MOSTLY, "writemostly"},
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{ CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
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{ CTR_FLAG_REGION_SIZE, "region_size"},
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{ CTR_FLAG_RAID10_COPIES, "raid10_copies"},
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{ CTR_FLAG_RAID10_FORMAT, "raid10_format"},
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{ CTR_FLAG_DATA_OFFSET, "data_offset"},
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{ CTR_FLAG_DELTA_DISKS, "delta_disks"},
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{ CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
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};
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/* Return argument name string for given @flag */
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static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
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{
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if (hweight32(flag) == 1) {
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struct arg_name_flag *anf = _arg_name_flags + ARRAY_SIZE(_arg_name_flags);
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while (anf-- > _arg_name_flags)
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if (flag & anf->flag)
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return anf->name;
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} else
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DMERR("%s called with more than one flag!", __func__);
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return NULL;
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}
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/*
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* bool helpers to test for various raid levels of a raid set,
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* is. it's level as reported by the superblock rather than
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* the requested raid_type passed to the constructor.
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*/
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/* Return true, if raid set in @rs is raid0 */
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static bool rs_is_raid0(struct raid_set *rs)
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{
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return !rs->md.level;
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}
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/* Return true, if raid set in @rs is raid10 */
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static bool rs_is_raid10(struct raid_set *rs)
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{
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return rs->md.level == 10;
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}
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/*
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* bool helpers to test for various raid levels of a raid type
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*/
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/* Return true, if raid type in @rt is raid0 */
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static bool rt_is_raid0(struct raid_type *rt)
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{
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return !rt->level;
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}
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/* Return true, if raid type in @rt is raid1 */
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static bool rt_is_raid1(struct raid_type *rt)
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{
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return rt->level == 1;
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}
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/* Return true, if raid type in @rt is raid10 */
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static bool rt_is_raid10(struct raid_type *rt)
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{
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return rt->level == 10;
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}
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/* Return true, if raid type in @rt is raid4/5 */
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static bool rt_is_raid45(struct raid_type *rt)
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{
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return __within_range(rt->level, 4, 5);
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}
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/* Return true, if raid type in @rt is raid6 */
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static bool rt_is_raid6(struct raid_type *rt)
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{
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return rt->level == 6;
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}
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/* Return true, if raid type in @rt is raid4/5/6 */
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static bool rt_is_raid456(struct raid_type *rt)
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{
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return __within_range(rt->level, 4, 6);
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}
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/* END: raid level bools */
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/* Return invalid ctr flags for the raid level of @rs */
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static uint32_t _invalid_flags(struct raid_set *rs)
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{
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if (rt_is_raid0(rs->raid_type))
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return RAID0_INVALID_FLAGS;
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else if (rt_is_raid1(rs->raid_type))
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return RAID1_INVALID_FLAGS;
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else if (rt_is_raid10(rs->raid_type))
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return RAID10_INVALID_FLAGS;
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else if (rt_is_raid45(rs->raid_type))
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return RAID45_INVALID_FLAGS;
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else if (rt_is_raid6(rs->raid_type))
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return RAID6_INVALID_FLAGS;
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return ~0;
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}
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/*
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* Check for any invalid flags set on @rs defined by bitset @invalid_flags
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*
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* Has to be called after parsing of the ctr flags!
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*/
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static int rs_check_for_invalid_flags(struct raid_set *rs)
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{
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if (rs->ctr_flags & _invalid_flags(rs)) {
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rs->ti->error = "Invalid flags combination";
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return -EINVAL;
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}
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return 0;
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}
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/* MD raid10 bit definitions and helpers */
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#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
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#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
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#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
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#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
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/* Return md raid10 near copies for @layout */
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static unsigned int _raid10_near_copies(int layout)
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{
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return layout & 0xFF;
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}
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/* Return md raid10 far copies for @layout */
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static unsigned int _raid10_far_copies(int layout)
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{
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return _raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
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}
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/* Return true if md raid10 offset for @layout */
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static unsigned int _is_raid10_offset(int layout)
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{
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return layout & RAID10_OFFSET;
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}
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/* Return true if md raid10 near for @layout */
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static unsigned int _is_raid10_near(int layout)
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{
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return !_is_raid10_offset(layout) && _raid10_near_copies(layout) > 1;
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}
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/* Return true if md raid10 far for @layout */
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static unsigned int _is_raid10_far(int layout)
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{
|
|
return !_is_raid10_offset(layout) && _raid10_far_copies(layout) > 1;
|
|
}
|
|
|
|
/* Return md raid10 layout string for @layout */
|
|
static const char *raid10_md_layout_to_format(int layout)
|
|
{
|
|
/*
|
|
* Bit 16 stands for "offset"
|
|
* (i.e. adjacent stripes hold copies)
|
|
*
|
|
* Refer to MD's raid10.c for details
|
|
*/
|
|
if (_is_raid10_offset(layout))
|
|
return "offset";
|
|
|
|
if (_raid10_near_copies(layout) > 1)
|
|
return "near";
|
|
|
|
WARN_ON(_raid10_far_copies(layout) < 2);
|
|
|
|
return "far";
|
|
}
|
|
|
|
/* Return md raid10 algorithm for @name */
|
|
static const int raid10_name_to_format(const char *name)
|
|
{
|
|
if (!strcasecmp(name, "near"))
|
|
return ALGORITHM_RAID10_NEAR;
|
|
else if (!strcasecmp(name, "offset"))
|
|
return ALGORITHM_RAID10_OFFSET;
|
|
else if (!strcasecmp(name, "far"))
|
|
return ALGORITHM_RAID10_FAR;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
/* Return md raid10 copies for @layout */
|
|
static unsigned int raid10_md_layout_to_copies(int layout)
|
|
{
|
|
return _raid10_near_copies(layout) > 1 ?
|
|
_raid10_near_copies(layout) : _raid10_far_copies(layout);
|
|
}
|
|
|
|
/* Return md raid10 format id for @format string */
|
|
static int raid10_format_to_md_layout(struct raid_set *rs,
|
|
unsigned int algorithm,
|
|
unsigned int copies)
|
|
{
|
|
unsigned int n = 1, f = 1, r = 0;
|
|
|
|
/*
|
|
* MD resilienece flaw:
|
|
*
|
|
* enabling use_far_sets for far/offset formats causes copies
|
|
* to be colocated on the same devs together with their origins!
|
|
*
|
|
* -> disable it for now in the definition above
|
|
*/
|
|
if (algorithm == ALGORITHM_RAID10_DEFAULT ||
|
|
algorithm == ALGORITHM_RAID10_NEAR)
|
|
n = copies;
|
|
|
|
else if (algorithm == ALGORITHM_RAID10_OFFSET) {
|
|
f = copies;
|
|
r = RAID10_OFFSET;
|
|
if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
|
|
r |= RAID10_USE_FAR_SETS;
|
|
|
|
} else if (algorithm == ALGORITHM_RAID10_FAR) {
|
|
f = copies;
|
|
r = !RAID10_OFFSET;
|
|
if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
|
|
r |= RAID10_USE_FAR_SETS;
|
|
|
|
} else
|
|
return -EINVAL;
|
|
|
|
return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
|
|
}
|
|
/* END: MD raid10 bit definitions and helpers */
|
|
|
|
/* Check for any of the raid10 algorithms */
|
|
static int _got_raid10(struct raid_type *rtp, const int layout)
|
|
{
|
|
if (rtp->level == 10) {
|
|
switch (rtp->algorithm) {
|
|
case ALGORITHM_RAID10_DEFAULT:
|
|
case ALGORITHM_RAID10_NEAR:
|
|
return _is_raid10_near(layout);
|
|
case ALGORITHM_RAID10_OFFSET:
|
|
return _is_raid10_offset(layout);
|
|
case ALGORITHM_RAID10_FAR:
|
|
return _is_raid10_far(layout);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Return raid_type for @name */
|
|
static struct raid_type *get_raid_type(const char *name)
|
|
{
|
|
struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
|
|
|
|
while (rtp-- > raid_types)
|
|
if (!strcasecmp(rtp->name, name))
|
|
return rtp;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Return raid_type for @name based derived from @level and @layout */
|
|
static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
|
|
{
|
|
struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
|
|
|
|
while (rtp-- > raid_types) {
|
|
/* RAID10 special checks based on @layout flags/properties */
|
|
if (rtp->level == level &&
|
|
(_got_raid10(rtp, layout) || rtp->algorithm == layout))
|
|
return rtp;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Set the mddev properties in @rs to the current
|
|
* ones retrieved from the freshest superblock
|
|
*/
|
|
static void rs_set_cur(struct raid_set *rs)
|
|
{
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
mddev->new_level = mddev->level;
|
|
mddev->new_layout = mddev->layout;
|
|
mddev->new_chunk_sectors = mddev->chunk_sectors;
|
|
}
|
|
|
|
/*
|
|
* Set the mddev properties in @rs to the new
|
|
* ones requested by the ctr
|
|
*/
|
|
static void rs_set_new(struct raid_set *rs)
|
|
{
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
mddev->level = mddev->new_level;
|
|
mddev->layout = mddev->new_layout;
|
|
mddev->chunk_sectors = mddev->new_chunk_sectors;
|
|
mddev->raid_disks = rs->raid_disks;
|
|
mddev->delta_disks = 0;
|
|
}
|
|
|
|
|
|
static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs)
|
|
{
|
|
unsigned i;
|
|
struct raid_set *rs;
|
|
|
|
if (raid_devs <= raid_type->parity_devs) {
|
|
ti->error = "Insufficient number of devices";
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
|
|
if (!rs) {
|
|
ti->error = "Cannot allocate raid context";
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
mddev_init(&rs->md);
|
|
|
|
rs->raid_disks = raid_devs;
|
|
rs->delta_disks = 0;
|
|
|
|
rs->ti = ti;
|
|
rs->raid_type = raid_type;
|
|
rs->md.raid_disks = raid_devs;
|
|
rs->md.level = raid_type->level;
|
|
rs->md.new_level = rs->md.level;
|
|
rs->md.layout = raid_type->algorithm;
|
|
rs->md.new_layout = rs->md.layout;
|
|
rs->md.delta_disks = 0;
|
|
rs->md.recovery_cp = rs_is_raid0(rs) ? MaxSector : 0;
|
|
|
|
for (i = 0; i < raid_devs; i++)
|
|
md_rdev_init(&rs->dev[i].rdev);
|
|
|
|
/*
|
|
* Remaining items to be initialized by further RAID params:
|
|
* rs->md.persistent
|
|
* rs->md.external
|
|
* rs->md.chunk_sectors
|
|
* rs->md.new_chunk_sectors
|
|
* rs->md.dev_sectors
|
|
*/
|
|
|
|
return rs;
|
|
}
|
|
|
|
static void context_free(struct raid_set *rs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
if (rs->dev[i].meta_dev)
|
|
dm_put_device(rs->ti, rs->dev[i].meta_dev);
|
|
md_rdev_clear(&rs->dev[i].rdev);
|
|
if (rs->dev[i].data_dev)
|
|
dm_put_device(rs->ti, rs->dev[i].data_dev);
|
|
}
|
|
|
|
kfree(rs);
|
|
}
|
|
|
|
/*
|
|
* For every device we have two words
|
|
* <meta_dev>: meta device name or '-' if missing
|
|
* <data_dev>: data device name or '-' if missing
|
|
*
|
|
* The following are permitted:
|
|
* - -
|
|
* - <data_dev>
|
|
* <meta_dev> <data_dev>
|
|
*
|
|
* The following is not allowed:
|
|
* <meta_dev> -
|
|
*
|
|
* This code parses those words. If there is a failure,
|
|
* the caller must use context_free to unwind the operations.
|
|
*/
|
|
static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
|
|
{
|
|
int i;
|
|
int rebuild = 0;
|
|
int metadata_available = 0;
|
|
int r = 0;
|
|
const char *arg;
|
|
|
|
/* Put off the number of raid devices argument to get to dev pairs */
|
|
arg = dm_shift_arg(as);
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
rs->dev[i].rdev.raid_disk = i;
|
|
|
|
rs->dev[i].meta_dev = NULL;
|
|
rs->dev[i].data_dev = NULL;
|
|
|
|
/*
|
|
* There are no offsets, since there is a separate device
|
|
* for data and metadata.
|
|
*/
|
|
rs->dev[i].rdev.data_offset = 0;
|
|
rs->dev[i].rdev.mddev = &rs->md;
|
|
|
|
arg = dm_shift_arg(as);
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (strcmp(arg, "-")) {
|
|
r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
|
|
&rs->dev[i].meta_dev);
|
|
if (r) {
|
|
rs->ti->error = "RAID metadata device lookup failure";
|
|
return r;
|
|
}
|
|
|
|
rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
|
|
if (!rs->dev[i].rdev.sb_page) {
|
|
rs->ti->error = "Failed to allocate superblock page";
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
arg = dm_shift_arg(as);
|
|
if (!arg)
|
|
return -EINVAL;
|
|
|
|
if (!strcmp(arg, "-")) {
|
|
if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
|
|
(!rs->dev[i].rdev.recovery_offset)) {
|
|
rs->ti->error = "Drive designated for rebuild not specified";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (rs->dev[i].meta_dev) {
|
|
rs->ti->error = "No data device supplied with metadata device";
|
|
return -EINVAL;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
|
|
&rs->dev[i].data_dev);
|
|
if (r) {
|
|
rs->ti->error = "RAID device lookup failure";
|
|
return r;
|
|
}
|
|
|
|
if (rs->dev[i].meta_dev) {
|
|
metadata_available = 1;
|
|
rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
|
|
}
|
|
rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
|
|
list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
|
|
if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
|
|
rebuild++;
|
|
}
|
|
|
|
if (metadata_available) {
|
|
rs->md.external = 0;
|
|
rs->md.persistent = 1;
|
|
rs->md.major_version = 2;
|
|
} else if (rebuild && !rs->md.recovery_cp) {
|
|
/*
|
|
* Without metadata, we will not be able to tell if the array
|
|
* is in-sync or not - we must assume it is not. Therefore,
|
|
* it is impossible to rebuild a drive.
|
|
*
|
|
* Even if there is metadata, the on-disk information may
|
|
* indicate that the array is not in-sync and it will then
|
|
* fail at that time.
|
|
*
|
|
* User could specify 'nosync' option if desperate.
|
|
*/
|
|
rs->ti->error = "Unable to rebuild drive while array is not in-sync";
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* validate_region_size
|
|
* @rs
|
|
* @region_size: region size in sectors. If 0, pick a size (4MiB default).
|
|
*
|
|
* Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
|
|
* Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
|
|
*
|
|
* Returns: 0 on success, -EINVAL on failure.
|
|
*/
|
|
static int validate_region_size(struct raid_set *rs, unsigned long region_size)
|
|
{
|
|
unsigned long min_region_size = rs->ti->len / (1 << 21);
|
|
|
|
if (!region_size) {
|
|
/*
|
|
* Choose a reasonable default. All figures in sectors.
|
|
*/
|
|
if (min_region_size > (1 << 13)) {
|
|
/* If not a power of 2, make it the next power of 2 */
|
|
region_size = roundup_pow_of_two(min_region_size);
|
|
DMINFO("Choosing default region size of %lu sectors",
|
|
region_size);
|
|
} else {
|
|
DMINFO("Choosing default region size of 4MiB");
|
|
region_size = 1 << 13; /* sectors */
|
|
}
|
|
} else {
|
|
/*
|
|
* Validate user-supplied value.
|
|
*/
|
|
if (region_size > rs->ti->len) {
|
|
rs->ti->error = "Supplied region size is too large";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (region_size < min_region_size) {
|
|
DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
|
|
region_size, min_region_size);
|
|
rs->ti->error = "Supplied region size is too small";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!is_power_of_2(region_size)) {
|
|
rs->ti->error = "Region size is not a power of 2";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (region_size < rs->md.chunk_sectors) {
|
|
rs->ti->error = "Region size is smaller than the chunk size";
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert sectors to bytes.
|
|
*/
|
|
rs->md.bitmap_info.chunksize = (region_size << 9);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* validate_raid_redundancy
|
|
* @rs
|
|
*
|
|
* Determine if there are enough devices in the array that haven't
|
|
* failed (or are being rebuilt) to form a usable array.
|
|
*
|
|
* Returns: 0 on success, -EINVAL on failure.
|
|
*/
|
|
static int validate_raid_redundancy(struct raid_set *rs)
|
|
{
|
|
unsigned i, rebuild_cnt = 0;
|
|
unsigned rebuilds_per_group = 0, copies, d;
|
|
unsigned group_size, last_group_start;
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++)
|
|
if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
|
|
!rs->dev[i].rdev.sb_page)
|
|
rebuild_cnt++;
|
|
|
|
switch (rs->raid_type->level) {
|
|
case 1:
|
|
if (rebuild_cnt >= rs->md.raid_disks)
|
|
goto too_many;
|
|
break;
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
if (rebuild_cnt > rs->raid_type->parity_devs)
|
|
goto too_many;
|
|
break;
|
|
case 10:
|
|
copies = raid10_md_layout_to_copies(rs->md.layout);
|
|
if (rebuild_cnt < copies)
|
|
break;
|
|
|
|
/*
|
|
* It is possible to have a higher rebuild count for RAID10,
|
|
* as long as the failed devices occur in different mirror
|
|
* groups (i.e. different stripes).
|
|
*
|
|
* When checking "near" format, make sure no adjacent devices
|
|
* have failed beyond what can be handled. In addition to the
|
|
* simple case where the number of devices is a multiple of the
|
|
* number of copies, we must also handle cases where the number
|
|
* of devices is not a multiple of the number of copies.
|
|
* E.g. dev1 dev2 dev3 dev4 dev5
|
|
* A A B B C
|
|
* C D D E E
|
|
*/
|
|
if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) {
|
|
for (i = 0; i < rs->md.raid_disks * copies; i++) {
|
|
if (!(i % copies))
|
|
rebuilds_per_group = 0;
|
|
d = i % rs->md.raid_disks;
|
|
if ((!rs->dev[d].rdev.sb_page ||
|
|
!test_bit(In_sync, &rs->dev[d].rdev.flags)) &&
|
|
(++rebuilds_per_group >= copies))
|
|
goto too_many;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* When checking "far" and "offset" formats, we need to ensure
|
|
* that the device that holds its copy is not also dead or
|
|
* being rebuilt. (Note that "far" and "offset" formats only
|
|
* support two copies right now. These formats also only ever
|
|
* use the 'use_far_sets' variant.)
|
|
*
|
|
* This check is somewhat complicated by the need to account
|
|
* for arrays that are not a multiple of (far) copies. This
|
|
* results in the need to treat the last (potentially larger)
|
|
* set differently.
|
|
*/
|
|
group_size = (rs->md.raid_disks / copies);
|
|
last_group_start = (rs->md.raid_disks / group_size) - 1;
|
|
last_group_start *= group_size;
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
if (!(i % copies) && !(i > last_group_start))
|
|
rebuilds_per_group = 0;
|
|
if ((!rs->dev[i].rdev.sb_page ||
|
|
!test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
|
|
(++rebuilds_per_group >= copies))
|
|
goto too_many;
|
|
}
|
|
break;
|
|
default:
|
|
if (rebuild_cnt)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
|
|
too_many:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Possible arguments are...
|
|
* <chunk_size> [optional_args]
|
|
*
|
|
* Argument definitions
|
|
* <chunk_size> The number of sectors per disk that
|
|
* will form the "stripe"
|
|
* [[no]sync] Force or prevent recovery of the
|
|
* entire array
|
|
* [rebuild <idx>] Rebuild the drive indicated by the index
|
|
* [daemon_sleep <ms>] Time between bitmap daemon work to
|
|
* clear bits
|
|
* [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
|
|
* [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
|
|
* [write_mostly <idx>] Indicate a write mostly drive via index
|
|
* [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
|
|
* [stripe_cache <sectors>] Stripe cache size for higher RAIDs
|
|
* [region_size <sectors>] Defines granularity of bitmap
|
|
*
|
|
* RAID10-only options:
|
|
* [raid10_copies <# copies>] Number of copies. (Default: 2)
|
|
* [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
|
|
*/
|
|
static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
|
|
unsigned num_raid_params)
|
|
{
|
|
int raid10_format = ALGORITHM_RAID10_DEFAULT;
|
|
unsigned raid10_copies = 2;
|
|
unsigned i;
|
|
unsigned value, region_size = 0;
|
|
sector_t sectors_per_dev = rs->ti->len;
|
|
sector_t max_io_len;
|
|
const char *arg, *key;
|
|
struct raid_dev *rd;
|
|
struct raid_type *rt = rs->raid_type;
|
|
|
|
arg = dm_shift_arg(as);
|
|
num_raid_params--; /* Account for chunk_size argument */
|
|
|
|
if (kstrtouint(arg, 10, &value) < 0) {
|
|
rs->ti->error = "Bad numerical argument given for chunk_size";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* First, parse the in-order required arguments
|
|
* "chunk_size" is the only argument of this type.
|
|
*/
|
|
if (rt_is_raid1(rt)) {
|
|
if (value)
|
|
DMERR("Ignoring chunk size parameter for RAID 1");
|
|
value = 0;
|
|
} else if (!is_power_of_2(value)) {
|
|
rs->ti->error = "Chunk size must be a power of 2";
|
|
return -EINVAL;
|
|
} else if (value < 8) {
|
|
rs->ti->error = "Chunk size value is too small";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
|
|
|
|
/*
|
|
* We set each individual device as In_sync with a completed
|
|
* 'recovery_offset'. If there has been a device failure or
|
|
* replacement then one of the following cases applies:
|
|
*
|
|
* 1) User specifies 'rebuild'.
|
|
* - Device is reset when param is read.
|
|
* 2) A new device is supplied.
|
|
* - No matching superblock found, resets device.
|
|
* 3) Device failure was transient and returns on reload.
|
|
* - Failure noticed, resets device for bitmap replay.
|
|
* 4) Device hadn't completed recovery after previous failure.
|
|
* - Superblock is read and overrides recovery_offset.
|
|
*
|
|
* What is found in the superblocks of the devices is always
|
|
* authoritative, unless 'rebuild' or '[no]sync' was specified.
|
|
*/
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
set_bit(In_sync, &rs->dev[i].rdev.flags);
|
|
rs->dev[i].rdev.recovery_offset = MaxSector;
|
|
}
|
|
|
|
/*
|
|
* Second, parse the unordered optional arguments
|
|
*/
|
|
for (i = 0; i < num_raid_params; i++) {
|
|
key = dm_shift_arg(as);
|
|
if (!key) {
|
|
rs->ti->error = "Not enough raid parameters given";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
|
|
if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one 'nosync' argument allowed";
|
|
return -EINVAL;
|
|
}
|
|
rs->md.recovery_cp = MaxSector;
|
|
continue;
|
|
}
|
|
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
|
|
if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one 'sync' argument allowed";
|
|
return -EINVAL;
|
|
}
|
|
rs->md.recovery_cp = 0;
|
|
continue;
|
|
}
|
|
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
|
|
if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
arg = dm_shift_arg(as);
|
|
i++; /* Account for the argument pairs */
|
|
if (!arg) {
|
|
rs->ti->error = "Wrong number of raid parameters given";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Parameters that take a string value are checked here.
|
|
*/
|
|
|
|
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
|
|
if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one 'raid10_format' argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
if (!rt_is_raid10(rt)) {
|
|
rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
|
|
return -EINVAL;
|
|
}
|
|
raid10_format = raid10_name_to_format(arg);
|
|
if (raid10_format < 0) {
|
|
rs->ti->error = "Invalid 'raid10_format' value given";
|
|
return raid10_format;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (kstrtouint(arg, 10, &value) < 0) {
|
|
rs->ti->error = "Bad numerical argument given in raid params";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
|
|
/*
|
|
* "rebuild" is being passed in by userspace to provide
|
|
* indexes of replaced devices and to set up additional
|
|
* devices on raid level takeover.
|
|
*/
|
|
if (!__within_range(value, 0, rs->raid_disks - 1)) {
|
|
rs->ti->error = "Invalid rebuild index given";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
|
|
rs->ti->error = "rebuild for this index already given";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rd = rs->dev + value;
|
|
clear_bit(In_sync, &rd->rdev.flags);
|
|
clear_bit(Faulty, &rd->rdev.flags);
|
|
rd->rdev.recovery_offset = 0;
|
|
set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
|
|
if (!rt_is_raid1(rt)) {
|
|
rs->ti->error = "write_mostly option is only valid for RAID1";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
|
|
rs->ti->error = "Invalid write_mostly index given";
|
|
return -EINVAL;
|
|
}
|
|
|
|
set_bit(WriteMostly, &rs->dev[value].rdev.flags);
|
|
set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
|
|
if (!rt_is_raid1(rt)) {
|
|
rs->ti->error = "max_write_behind option is only valid for RAID1";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one max_write_behind argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* In device-mapper, we specify things in sectors, but
|
|
* MD records this value in kB
|
|
*/
|
|
value /= 2;
|
|
if (value > COUNTER_MAX) {
|
|
rs->ti->error = "Max write-behind limit out of range";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->md.bitmap_info.max_write_behind = value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
|
|
if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one daemon_sleep argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
|
|
rs->ti->error = "daemon sleep period out of range";
|
|
return -EINVAL;
|
|
}
|
|
rs->md.bitmap_info.daemon_sleep = value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
|
|
/* Userspace passes new data_offset after having extended the the data image LV */
|
|
if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one data_offset argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
/* Ensure sensible data offset */
|
|
if (value < 0) {
|
|
rs->ti->error = "Bogus data_offset value";
|
|
return -EINVAL;
|
|
}
|
|
rs->data_offset = value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
|
|
/* Define the +/-# of disks to add to/remove from the given raid set */
|
|
if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one delta_disks argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
/* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
|
|
if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
|
|
rs->ti->error = "Too many delta_disk requested";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->delta_disks = value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
|
|
if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one stripe_cache argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* In device-mapper, we specify things in sectors, but
|
|
* MD records this value in kB
|
|
*/
|
|
value /= 2;
|
|
|
|
if (!rt_is_raid456(rt)) {
|
|
rs->ti->error = "Inappropriate argument: stripe_cache";
|
|
return -EINVAL;
|
|
}
|
|
if (raid5_set_cache_size(&rs->md, (int)value)) {
|
|
rs->ti->error = "Bad stripe_cache size";
|
|
return -EINVAL;
|
|
}
|
|
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
|
|
if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one min_recovery_rate argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
if (value > INT_MAX) {
|
|
rs->ti->error = "min_recovery_rate out of range";
|
|
return -EINVAL;
|
|
}
|
|
rs->md.sync_speed_min = (int)value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
|
|
if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one max_recovery_rate argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
if (value > INT_MAX) {
|
|
rs->ti->error = "max_recovery_rate out of range";
|
|
return -EINVAL;
|
|
}
|
|
rs->md.sync_speed_max = (int)value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
|
|
if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one region_size argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
|
|
region_size = value;
|
|
} else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
|
|
if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
|
|
rs->ti->error = "Only one raid10_copies argument pair allowed";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!__within_range(value, 2, rs->md.raid_disks)) {
|
|
rs->ti->error = "Bad value for 'raid10_copies'";
|
|
return -EINVAL;
|
|
}
|
|
|
|
raid10_copies = value;
|
|
} else {
|
|
DMERR("Unable to parse RAID parameter: %s", key);
|
|
rs->ti->error = "Unable to parse RAID parameter";
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (validate_region_size(rs, region_size))
|
|
return -EINVAL;
|
|
|
|
if (rs->md.chunk_sectors)
|
|
max_io_len = rs->md.chunk_sectors;
|
|
else
|
|
max_io_len = region_size;
|
|
|
|
if (dm_set_target_max_io_len(rs->ti, max_io_len))
|
|
return -EINVAL;
|
|
|
|
if (rt_is_raid10(rt)) {
|
|
if (raid10_copies > rs->md.raid_disks) {
|
|
rs->ti->error = "Not enough devices to satisfy specification";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
|
|
if (rs->md.new_layout < 0) {
|
|
rs->ti->error = "Error getting raid10 format";
|
|
return rs->md.new_layout;
|
|
}
|
|
|
|
rt = get_raid_type_by_ll(10, rs->md.new_layout);
|
|
if (!rt) {
|
|
rs->ti->error = "Failed to recognize new raid10 layout";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
|
|
rt->algorithm == ALGORITHM_RAID10_NEAR) &&
|
|
test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
|
|
rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* (Len * #mirrors) / #devices */
|
|
sectors_per_dev = rs->ti->len * raid10_copies;
|
|
sector_div(sectors_per_dev, rs->md.raid_disks);
|
|
|
|
rs->md.layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
|
|
rs->md.new_layout = rs->md.layout;
|
|
} else if (!rt_is_raid1(rt) &&
|
|
sector_div(sectors_per_dev, (rs->md.raid_disks - rt->parity_devs))) {
|
|
rs->ti->error = "Target length not divisible by number of data devices";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs->raid10_copies = raid10_copies;
|
|
rs->md.dev_sectors = sectors_per_dev;
|
|
|
|
/* Assume there are no metadata devices until the drives are parsed */
|
|
rs->md.persistent = 0;
|
|
rs->md.external = 1;
|
|
|
|
/* Check, if any invalid ctr arguments have been passed in for the raid level */
|
|
return rs_check_for_invalid_flags(rs);
|
|
}
|
|
|
|
/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
|
|
static unsigned int mddev_data_stripes(struct raid_set *rs)
|
|
{
|
|
return rs->md.raid_disks - rs->raid_type->parity_devs;
|
|
}
|
|
|
|
static void do_table_event(struct work_struct *ws)
|
|
{
|
|
struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
|
|
|
|
dm_table_event(rs->ti->table);
|
|
}
|
|
|
|
static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
|
|
{
|
|
struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
|
|
|
|
return mddev_congested(&rs->md, bits);
|
|
}
|
|
|
|
/*
|
|
* Make sure a valid takover (level switch) is being requested on @rs
|
|
*
|
|
* Conversions of raid sets from one MD personality to another
|
|
* have to conform to restrictions which are enforced here.
|
|
*
|
|
* Degration is already checked for in rs_check_conversion() below.
|
|
*/
|
|
static int rs_check_takeover(struct raid_set *rs)
|
|
{
|
|
struct mddev *mddev = &rs->md;
|
|
unsigned int near_copies;
|
|
|
|
switch (mddev->level) {
|
|
case 0:
|
|
/* raid0 -> raid1/5 with one disk */
|
|
if ((mddev->new_level == 1 || mddev->new_level == 5) &&
|
|
mddev->raid_disks == 1)
|
|
return 0;
|
|
|
|
/* raid0 -> raid10 */
|
|
if (mddev->new_level == 10 &&
|
|
!(rs->raid_disks % 2))
|
|
return 0;
|
|
|
|
/* raid0 with multiple disks -> raid4/5/6 */
|
|
if (__within_range(mddev->new_level, 4, 6) &&
|
|
mddev->new_layout == ALGORITHM_PARITY_N &&
|
|
mddev->raid_disks > 1)
|
|
return 0;
|
|
|
|
break;
|
|
|
|
case 10:
|
|
/* Can't takeover raid10_offset! */
|
|
if (_is_raid10_offset(mddev->layout))
|
|
break;
|
|
|
|
near_copies = _raid10_near_copies(mddev->layout);
|
|
|
|
/* raid10* -> raid0 */
|
|
if (mddev->new_level == 0) {
|
|
/* Can takeover raid10_near with raid disks divisable by data copies! */
|
|
if (near_copies > 1 &&
|
|
!(mddev->raid_disks % near_copies)) {
|
|
mddev->raid_disks /= near_copies;
|
|
mddev->delta_disks = mddev->raid_disks;
|
|
return 0;
|
|
}
|
|
|
|
/* Can takeover raid10_far */
|
|
if (near_copies == 1 &&
|
|
_raid10_far_copies(mddev->layout) > 1)
|
|
return 0;
|
|
|
|
break;
|
|
}
|
|
|
|
/* raid10_{near,far} -> raid1 */
|
|
if (mddev->new_level == 1 &&
|
|
max(near_copies, _raid10_far_copies(mddev->layout)) == mddev->raid_disks)
|
|
return 0;
|
|
|
|
/* raid10_{near,far} with 2 disks -> raid4/5 */
|
|
if (__within_range(mddev->new_level, 4, 5) &&
|
|
mddev->raid_disks == 2)
|
|
return 0;
|
|
break;
|
|
|
|
case 1:
|
|
/* raid1 with 2 disks -> raid4/5 */
|
|
if (__within_range(mddev->new_level, 4, 5) &&
|
|
mddev->raid_disks == 2) {
|
|
mddev->degraded = 1;
|
|
return 0;
|
|
}
|
|
|
|
/* raid1 -> raid0 */
|
|
if (mddev->new_level == 0 &&
|
|
mddev->raid_disks == 1)
|
|
return 0;
|
|
|
|
/* raid1 -> raid10 */
|
|
if (mddev->new_level == 10)
|
|
return 0;
|
|
|
|
break;
|
|
|
|
case 4:
|
|
/* raid4 -> raid0 */
|
|
if (mddev->new_level == 0)
|
|
return 0;
|
|
|
|
/* raid4 -> raid1/5 with 2 disks */
|
|
if ((mddev->new_level == 1 || mddev->new_level == 5) &&
|
|
mddev->raid_disks == 2)
|
|
return 0;
|
|
|
|
/* raid4 -> raid5/6 with parity N */
|
|
if (__within_range(mddev->new_level, 5, 6) &&
|
|
mddev->layout == ALGORITHM_PARITY_N)
|
|
return 0;
|
|
break;
|
|
|
|
case 5:
|
|
/* raid5 with parity N -> raid0 */
|
|
if (mddev->new_level == 0 &&
|
|
mddev->layout == ALGORITHM_PARITY_N)
|
|
return 0;
|
|
|
|
/* raid5 with parity N -> raid4 */
|
|
if (mddev->new_level == 4 &&
|
|
mddev->layout == ALGORITHM_PARITY_N)
|
|
return 0;
|
|
|
|
/* raid5 with 2 disks -> raid1/4/10 */
|
|
if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
|
|
mddev->raid_disks == 2)
|
|
return 0;
|
|
|
|
/* raid5 with parity N -> raid6 with parity N */
|
|
if (mddev->new_level == 6 &&
|
|
((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
|
|
__within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
|
|
return 0;
|
|
break;
|
|
|
|
case 6:
|
|
/* raid6 with parity N -> raid0 */
|
|
if (mddev->new_level == 0 &&
|
|
mddev->layout == ALGORITHM_PARITY_N)
|
|
return 0;
|
|
|
|
/* raid6 with parity N -> raid4 */
|
|
if (mddev->new_level == 4 &&
|
|
mddev->layout == ALGORITHM_PARITY_N)
|
|
return 0;
|
|
|
|
/* raid6_*_n with parity N -> raid5_* */
|
|
if (mddev->new_level == 5 &&
|
|
((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
|
|
__within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
|
|
return 0;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
rs->ti->error = "takeover not possible";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* True if @rs requested to be taken over */
|
|
static bool rs_takeover_requested(struct raid_set *rs)
|
|
{
|
|
return rs->md.new_level != rs->md.level;
|
|
}
|
|
|
|
/* Features */
|
|
#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
|
|
|
|
/* State flags for sb->flags */
|
|
#define SB_FLAG_RESHAPE_ACTIVE 0x1
|
|
#define SB_FLAG_RESHAPE_BACKWARDS 0x2
|
|
|
|
/*
|
|
* This structure is never routinely used by userspace, unlike md superblocks.
|
|
* Devices with this superblock should only ever be accessed via device-mapper.
|
|
*/
|
|
#define DM_RAID_MAGIC 0x64526D44
|
|
struct dm_raid_superblock {
|
|
__le32 magic; /* "DmRd" */
|
|
__le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
|
|
|
|
__le32 num_devices; /* Number of devices in this raid set. (Max 64) */
|
|
__le32 array_position; /* The position of this drive in the raid set */
|
|
|
|
__le64 events; /* Incremented by md when superblock updated */
|
|
__le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
|
|
/* indicate failures (see extension below) */
|
|
|
|
/*
|
|
* This offset tracks the progress of the repair or replacement of
|
|
* an individual drive.
|
|
*/
|
|
__le64 disk_recovery_offset;
|
|
|
|
/*
|
|
* This offset tracks the progress of the initial raid set
|
|
* synchronisation/parity calculation.
|
|
*/
|
|
__le64 array_resync_offset;
|
|
|
|
/*
|
|
* raid characteristics
|
|
*/
|
|
__le32 level;
|
|
__le32 layout;
|
|
__le32 stripe_sectors;
|
|
|
|
/********************************************************************
|
|
* BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
|
|
*
|
|
* FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
|
|
*/
|
|
|
|
__le32 flags; /* Flags defining array states for reshaping */
|
|
|
|
/*
|
|
* This offset tracks the progress of a raid
|
|
* set reshape in order to be able to restart it
|
|
*/
|
|
__le64 reshape_position;
|
|
|
|
/*
|
|
* These define the properties of the array in case of an interrupted reshape
|
|
*/
|
|
__le32 new_level;
|
|
__le32 new_layout;
|
|
__le32 new_stripe_sectors;
|
|
__le32 delta_disks;
|
|
|
|
__le64 array_sectors; /* Array size in sectors */
|
|
|
|
/*
|
|
* Sector offsets to data on devices (reshaping).
|
|
* Needed to support out of place reshaping, thus
|
|
* not writing over any stripes whilst converting
|
|
* them from old to new layout
|
|
*/
|
|
__le64 data_offset;
|
|
__le64 new_data_offset;
|
|
|
|
__le64 sectors; /* Used device size in sectors */
|
|
|
|
/*
|
|
* Additonal Bit field of devices indicating failures to support
|
|
* up to 256 devices with the 1.9.0 on-disk metadata format
|
|
*/
|
|
__le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
|
|
|
|
__le32 incompat_features; /* Used to indicate any incompatible features */
|
|
|
|
/* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
|
|
} __packed;
|
|
|
|
static int read_disk_sb(struct md_rdev *rdev, int size)
|
|
{
|
|
BUG_ON(!rdev->sb_page);
|
|
|
|
if (rdev->sb_loaded)
|
|
return 0;
|
|
|
|
if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, 1)) {
|
|
DMERR("Failed to read superblock of device at position %d",
|
|
rdev->raid_disk);
|
|
md_error(rdev->mddev, rdev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rdev->sb_loaded = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
|
|
{
|
|
failed_devices[0] = le64_to_cpu(sb->failed_devices);
|
|
memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
|
|
|
|
if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
|
|
int i = ARRAY_SIZE(sb->extended_failed_devices);
|
|
|
|
while (i--)
|
|
failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
|
|
}
|
|
}
|
|
|
|
static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
|
|
{
|
|
int i = ARRAY_SIZE(sb->extended_failed_devices);
|
|
|
|
sb->failed_devices = cpu_to_le64(failed_devices[0]);
|
|
while (i--)
|
|
sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
|
|
}
|
|
|
|
/*
|
|
* Synchronize the superblock members with the raid set properties
|
|
*
|
|
* All superblock data is little endian.
|
|
*/
|
|
static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
|
|
{
|
|
bool update_failed_devices = false;
|
|
unsigned int i;
|
|
uint64_t failed_devices[DISKS_ARRAY_ELEMS];
|
|
struct dm_raid_superblock *sb;
|
|
struct raid_set *rs = container_of(mddev, struct raid_set, md);
|
|
|
|
/* No metadata device, no superblock */
|
|
if (!rdev->meta_bdev)
|
|
return;
|
|
|
|
BUG_ON(!rdev->sb_page);
|
|
|
|
sb = page_address(rdev->sb_page);
|
|
|
|
sb_retrieve_failed_devices(sb, failed_devices);
|
|
|
|
for (i = 0; i < rs->raid_disks; i++)
|
|
if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
|
|
update_failed_devices = true;
|
|
set_bit(i, (void *) failed_devices);
|
|
}
|
|
|
|
if (update_failed_devices)
|
|
sb_update_failed_devices(sb, failed_devices);
|
|
|
|
sb->magic = cpu_to_le32(DM_RAID_MAGIC);
|
|
sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
|
|
|
|
sb->num_devices = cpu_to_le32(mddev->raid_disks);
|
|
sb->array_position = cpu_to_le32(rdev->raid_disk);
|
|
|
|
sb->events = cpu_to_le64(mddev->events);
|
|
|
|
sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
|
|
sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
|
|
|
|
sb->level = cpu_to_le32(mddev->level);
|
|
sb->layout = cpu_to_le32(mddev->layout);
|
|
sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
|
|
|
|
sb->new_level = cpu_to_le32(mddev->new_level);
|
|
sb->new_layout = cpu_to_le32(mddev->new_layout);
|
|
sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
|
|
|
|
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
|
|
|
|
smp_rmb(); /* Make sure we access most recent reshape position */
|
|
sb->reshape_position = cpu_to_le64(mddev->reshape_position);
|
|
if (le64_to_cpu(sb->reshape_position) != MaxSector) {
|
|
/* Flag ongoing reshape */
|
|
sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
|
|
|
|
if (mddev->delta_disks < 0 || mddev->reshape_backwards)
|
|
sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
|
|
} else {
|
|
/* Clear reshape flags */
|
|
sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
|
|
}
|
|
|
|
sb->array_sectors = cpu_to_le64(mddev->array_sectors);
|
|
sb->data_offset = cpu_to_le64(rdev->data_offset);
|
|
sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
|
|
sb->sectors = cpu_to_le64(rdev->sectors);
|
|
|
|
/* Zero out the rest of the payload after the size of the superblock */
|
|
memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
|
|
}
|
|
|
|
/*
|
|
* super_load
|
|
*
|
|
* This function creates a superblock if one is not found on the device
|
|
* and will decide which superblock to use if there's a choice.
|
|
*
|
|
* Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
|
|
*/
|
|
static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
|
|
{
|
|
int r;
|
|
struct dm_raid_superblock *sb;
|
|
struct dm_raid_superblock *refsb;
|
|
uint64_t events_sb, events_refsb;
|
|
|
|
rdev->sb_start = 0;
|
|
rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
|
|
if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
|
|
DMERR("superblock size of a logical block is no longer valid");
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = read_disk_sb(rdev, rdev->sb_size);
|
|
if (r)
|
|
return r;
|
|
|
|
sb = page_address(rdev->sb_page);
|
|
|
|
/*
|
|
* Two cases that we want to write new superblocks and rebuild:
|
|
* 1) New device (no matching magic number)
|
|
* 2) Device specified for rebuild (!In_sync w/ offset == 0)
|
|
*/
|
|
if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
|
|
(!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
|
|
super_sync(rdev->mddev, rdev);
|
|
|
|
set_bit(FirstUse, &rdev->flags);
|
|
sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
|
|
|
|
/* Force writing of superblocks to disk */
|
|
set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
|
|
|
|
/* Any superblock is better than none, choose that if given */
|
|
return refdev ? 0 : 1;
|
|
}
|
|
|
|
if (!refdev)
|
|
return 1;
|
|
|
|
events_sb = le64_to_cpu(sb->events);
|
|
|
|
refsb = page_address(refdev->sb_page);
|
|
events_refsb = le64_to_cpu(refsb->events);
|
|
|
|
return (events_sb > events_refsb) ? 1 : 0;
|
|
}
|
|
|
|
static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
|
|
{
|
|
int role;
|
|
unsigned int d;
|
|
struct mddev *mddev = &rs->md;
|
|
uint64_t events_sb;
|
|
uint64_t failed_devices[DISKS_ARRAY_ELEMS];
|
|
struct dm_raid_superblock *sb;
|
|
uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
|
|
struct md_rdev *r;
|
|
struct dm_raid_superblock *sb2;
|
|
|
|
sb = page_address(rdev->sb_page);
|
|
events_sb = le64_to_cpu(sb->events);
|
|
|
|
/*
|
|
* Initialise to 1 if this is a new superblock.
|
|
*/
|
|
mddev->events = events_sb ? : 1;
|
|
|
|
mddev->reshape_position = MaxSector;
|
|
|
|
/*
|
|
* Reshaping is supported, e.g. reshape_position is valid
|
|
* in superblock and superblock content is authoritative.
|
|
*/
|
|
if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
|
|
/* Superblock is authoritative wrt given raid set layout! */
|
|
mddev->raid_disks = le32_to_cpu(sb->num_devices);
|
|
mddev->level = le32_to_cpu(sb->level);
|
|
mddev->layout = le32_to_cpu(sb->layout);
|
|
mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
|
|
mddev->new_level = le32_to_cpu(sb->new_level);
|
|
mddev->new_layout = le32_to_cpu(sb->new_layout);
|
|
mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
|
|
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
|
|
mddev->array_sectors = le64_to_cpu(sb->array_sectors);
|
|
|
|
/* raid was reshaping and got interrupted */
|
|
if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
|
|
if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
|
|
DMERR("Reshape requested but raid set is still reshaping");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (mddev->delta_disks < 0 ||
|
|
(!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
|
|
mddev->reshape_backwards = 1;
|
|
else
|
|
mddev->reshape_backwards = 0;
|
|
|
|
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
|
|
rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
|
|
}
|
|
|
|
} else {
|
|
/*
|
|
* No takeover/reshaping, because we don't have the extended v1.9.0 metadata
|
|
*/
|
|
if (le32_to_cpu(sb->level) != mddev->level) {
|
|
DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)");
|
|
return -EINVAL;
|
|
}
|
|
if (le32_to_cpu(sb->layout) != mddev->layout) {
|
|
DMERR("Reshaping raid sets not yet supported. (raid layout change)");
|
|
DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout);
|
|
DMERR(" Old layout: %s w/ %d copies",
|
|
raid10_md_layout_to_format(le32_to_cpu(sb->layout)),
|
|
raid10_md_layout_to_copies(le32_to_cpu(sb->layout)));
|
|
DMERR(" New layout: %s w/ %d copies",
|
|
raid10_md_layout_to_format(mddev->layout),
|
|
raid10_md_layout_to_copies(mddev->layout));
|
|
return -EINVAL;
|
|
}
|
|
if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) {
|
|
DMERR("Reshaping raid sets not yet supported. (stripe sectors change)");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* We can only change the number of devices in raid1 with old (i.e. pre 1.0.7) metadata */
|
|
if (!rt_is_raid1(rs->raid_type) &&
|
|
(le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
|
|
DMERR("Reshaping raid sets not yet supported. (device count change from %u to %u)",
|
|
sb->num_devices, mddev->raid_disks);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Table line is checked vs. authoritative superblock */
|
|
rs_set_new(rs);
|
|
}
|
|
|
|
if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
|
|
mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
|
|
|
|
/*
|
|
* During load, we set FirstUse if a new superblock was written.
|
|
* There are two reasons we might not have a superblock:
|
|
* 1) The raid set is brand new - in which case, all of the
|
|
* devices must have their In_sync bit set. Also,
|
|
* recovery_cp must be 0, unless forced.
|
|
* 2) This is a new device being added to an old raid set
|
|
* and the new device needs to be rebuilt - in which
|
|
* case the In_sync bit will /not/ be set and
|
|
* recovery_cp must be MaxSector.
|
|
*/
|
|
d = 0;
|
|
rdev_for_each(r, mddev) {
|
|
if (test_bit(FirstUse, &r->flags))
|
|
new_devs++;
|
|
|
|
if (!test_bit(In_sync, &r->flags)) {
|
|
DMINFO("Device %d specified for rebuild; clearing superblock",
|
|
r->raid_disk);
|
|
rebuilds++;
|
|
|
|
if (test_bit(FirstUse, &r->flags))
|
|
rebuild_and_new++;
|
|
}
|
|
|
|
d++;
|
|
}
|
|
|
|
if (new_devs == rs->raid_disks || !rebuilds) {
|
|
/* Replace a broken device */
|
|
if (new_devs == 1 && !rs->delta_disks)
|
|
;
|
|
if (new_devs == rs->raid_disks) {
|
|
DMINFO("Superblocks created for new raid set");
|
|
set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
|
|
set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
|
|
mddev->recovery_cp = 0;
|
|
} else if (new_devs && new_devs != rs->raid_disks && !rebuilds) {
|
|
DMERR("New device injected into existing raid set without "
|
|
"'delta_disks' or 'rebuild' parameter specified");
|
|
return -EINVAL;
|
|
}
|
|
} else if (new_devs && new_devs != rebuilds) {
|
|
DMERR("%u 'rebuild' devices cannot be injected into"
|
|
" a raid set with %u other first-time devices",
|
|
rebuilds, new_devs);
|
|
return -EINVAL;
|
|
} else if (rebuilds) {
|
|
if (rebuild_and_new && rebuilds != rebuild_and_new) {
|
|
DMERR("new device%s provided without 'rebuild'",
|
|
new_devs > 1 ? "s" : "");
|
|
return -EINVAL;
|
|
} else if (mddev->recovery_cp != MaxSector) {
|
|
DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
|
|
(unsigned long long) mddev->recovery_cp);
|
|
return -EINVAL;
|
|
} else if (mddev->reshape_position != MaxSector) {
|
|
DMERR("'rebuild' specified while raid set is being reshaped");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now we set the Faulty bit for those devices that are
|
|
* recorded in the superblock as failed.
|
|
*/
|
|
sb_retrieve_failed_devices(sb, failed_devices);
|
|
rdev_for_each(r, mddev) {
|
|
if (!r->sb_page)
|
|
continue;
|
|
sb2 = page_address(r->sb_page);
|
|
sb2->failed_devices = 0;
|
|
memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
|
|
|
|
/*
|
|
* Check for any device re-ordering.
|
|
*/
|
|
if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
|
|
role = le32_to_cpu(sb2->array_position);
|
|
if (role < 0)
|
|
continue;
|
|
|
|
if (role != r->raid_disk) {
|
|
if (_is_raid10_near(mddev->layout)) {
|
|
if (mddev->raid_disks % _raid10_near_copies(mddev->layout) ||
|
|
rs->raid_disks % rs->raid10_copies) {
|
|
rs->ti->error =
|
|
"Cannot change raid10 near set to odd # of devices!";
|
|
return -EINVAL;
|
|
}
|
|
|
|
sb2->array_position = cpu_to_le32(r->raid_disk);
|
|
|
|
} else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
|
|
!(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
|
|
!rt_is_raid1(rs->raid_type)) {
|
|
rs->ti->error = "Cannot change device positions in raid set";
|
|
return -EINVAL;
|
|
}
|
|
|
|
DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
|
|
}
|
|
|
|
/*
|
|
* Partial recovery is performed on
|
|
* returning failed devices.
|
|
*/
|
|
if (test_bit(role, (void *) failed_devices))
|
|
set_bit(Faulty, &r->flags);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
|
|
{
|
|
struct mddev *mddev = &rs->md;
|
|
struct dm_raid_superblock *sb;
|
|
|
|
if (rs_is_raid0(rs) || !rdev->sb_page)
|
|
return 0;
|
|
|
|
sb = page_address(rdev->sb_page);
|
|
|
|
/*
|
|
* If mddev->events is not set, we know we have not yet initialized
|
|
* the array.
|
|
*/
|
|
if (!mddev->events && super_init_validation(rs, rdev))
|
|
return -EINVAL;
|
|
|
|
if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
|
|
rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sb->incompat_features) {
|
|
rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Enable bitmap creation for RAID levels != 0 */
|
|
mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
|
|
rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
|
|
|
|
if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
|
|
/* Retrieve device size stored in superblock to be prepared for shrink */
|
|
rdev->sectors = le64_to_cpu(sb->sectors);
|
|
rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
|
|
if (rdev->recovery_offset == MaxSector)
|
|
set_bit(In_sync, &rdev->flags);
|
|
/*
|
|
* If no reshape in progress -> we're recovering single
|
|
* disk(s) and have to set the device(s) to out-of-sync
|
|
*/
|
|
else if (rs->md.reshape_position == MaxSector)
|
|
clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
|
|
}
|
|
|
|
/*
|
|
* If a device comes back, set it as not In_sync and no longer faulty.
|
|
*/
|
|
if (test_and_clear_bit(Faulty, &rdev->flags)) {
|
|
rdev->recovery_offset = 0;
|
|
clear_bit(In_sync, &rdev->flags);
|
|
rdev->saved_raid_disk = rdev->raid_disk;
|
|
}
|
|
|
|
/* Reshape support -> restore repective data offsets */
|
|
rdev->data_offset = le64_to_cpu(sb->data_offset);
|
|
rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Analyse superblocks and select the freshest.
|
|
*/
|
|
static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
|
|
{
|
|
int r;
|
|
struct raid_dev *dev;
|
|
struct md_rdev *rdev, *tmp, *freshest;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
freshest = NULL;
|
|
rdev_for_each_safe(rdev, tmp, mddev) {
|
|
/*
|
|
* Skipping super_load due to CTR_FLAG_SYNC will cause
|
|
* the array to undergo initialization again as
|
|
* though it were new. This is the intended effect
|
|
* of the "sync" directive.
|
|
*
|
|
* When reshaping capability is added, we must ensure
|
|
* that the "sync" directive is disallowed during the
|
|
* reshape.
|
|
*/
|
|
if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
|
|
continue;
|
|
|
|
if (!rdev->meta_bdev)
|
|
continue;
|
|
|
|
r = super_load(rdev, freshest);
|
|
|
|
switch (r) {
|
|
case 1:
|
|
freshest = rdev;
|
|
break;
|
|
case 0:
|
|
break;
|
|
default:
|
|
dev = container_of(rdev, struct raid_dev, rdev);
|
|
if (dev->meta_dev)
|
|
dm_put_device(ti, dev->meta_dev);
|
|
|
|
dev->meta_dev = NULL;
|
|
rdev->meta_bdev = NULL;
|
|
|
|
if (rdev->sb_page)
|
|
put_page(rdev->sb_page);
|
|
|
|
rdev->sb_page = NULL;
|
|
|
|
rdev->sb_loaded = 0;
|
|
|
|
/*
|
|
* We might be able to salvage the data device
|
|
* even though the meta device has failed. For
|
|
* now, we behave as though '- -' had been
|
|
* set for this device in the table.
|
|
*/
|
|
if (dev->data_dev)
|
|
dm_put_device(ti, dev->data_dev);
|
|
|
|
dev->data_dev = NULL;
|
|
rdev->bdev = NULL;
|
|
|
|
list_del(&rdev->same_set);
|
|
}
|
|
}
|
|
|
|
if (!freshest)
|
|
return 0;
|
|
|
|
if (validate_raid_redundancy(rs)) {
|
|
rs->ti->error = "Insufficient redundancy to activate array";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Validation of the freshest device provides the source of
|
|
* validation for the remaining devices.
|
|
*/
|
|
if (super_validate(rs, freshest)) {
|
|
rs->ti->error = "Unable to assemble array: Invalid superblocks";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rdev_for_each(rdev, mddev)
|
|
if ((rdev != freshest) && super_validate(rs, rdev))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
|
|
static void _reorder_raid_disk_indexes(struct raid_set *rs)
|
|
{
|
|
int i = 0;
|
|
struct md_rdev *rdev;
|
|
|
|
rdev_for_each(rdev, &rs->md) {
|
|
rdev->raid_disk = i++;
|
|
rdev->saved_raid_disk = rdev->new_raid_disk = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup @rs for takeover by a different raid level
|
|
*/
|
|
static int rs_setup_takeover(struct raid_set *rs)
|
|
{
|
|
struct mddev *mddev = &rs->md;
|
|
struct md_rdev *rdev;
|
|
unsigned int d = mddev->raid_disks = rs->raid_disks;
|
|
sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
|
|
|
|
if (rt_is_raid10(rs->raid_type)) {
|
|
if (mddev->level == 0) {
|
|
/* Userpace reordered disks -> adjust raid_disk indexes */
|
|
_reorder_raid_disk_indexes(rs);
|
|
|
|
/* raid0 -> raid10_far layout */
|
|
mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
|
|
rs->raid10_copies);
|
|
} else if (mddev->level == 1)
|
|
/* raid1 -> raid10_near layout */
|
|
mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
|
|
rs->raid_disks);
|
|
else
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
|
|
mddev->recovery_cp = MaxSector;
|
|
|
|
while (d--) {
|
|
rdev = &rs->dev[d].rdev;
|
|
|
|
if (test_bit(d, (void *) rs->rebuild_disks)) {
|
|
clear_bit(In_sync, &rdev->flags);
|
|
clear_bit(Faulty, &rdev->flags);
|
|
mddev->recovery_cp = rdev->recovery_offset = 0;
|
|
/* Bitmap has to be created when we do an "up" takeover */
|
|
set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
|
|
}
|
|
|
|
rdev->new_data_offset = new_data_offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Enable/disable discard support on RAID set depending on
|
|
* RAID level and discard properties of underlying RAID members.
|
|
*/
|
|
static void configure_discard_support(struct raid_set *rs)
|
|
{
|
|
int i;
|
|
bool raid456;
|
|
struct dm_target *ti = rs->ti;
|
|
|
|
/* Assume discards not supported until after checks below. */
|
|
ti->discards_supported = false;
|
|
|
|
/* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
|
|
raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
struct request_queue *q;
|
|
|
|
if (!rs->dev[i].rdev.bdev)
|
|
continue;
|
|
|
|
q = bdev_get_queue(rs->dev[i].rdev.bdev);
|
|
if (!q || !blk_queue_discard(q))
|
|
return;
|
|
|
|
if (raid456) {
|
|
if (!q->limits.discard_zeroes_data)
|
|
return;
|
|
if (!devices_handle_discard_safely) {
|
|
DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
|
|
DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* All RAID members properly support discards */
|
|
ti->discards_supported = true;
|
|
|
|
/*
|
|
* RAID1 and RAID10 personalities require bio splitting,
|
|
* RAID0/4/5/6 don't and process large discard bios properly.
|
|
*/
|
|
ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
|
|
ti->num_discard_bios = 1;
|
|
}
|
|
|
|
/*
|
|
* Construct a RAID0/1/10/4/5/6 mapping:
|
|
* Args:
|
|
* <raid_type> <#raid_params> <raid_params>{0,} \
|
|
* <#raid_devs> [<meta_dev1> <dev1>]{1,}
|
|
*
|
|
* <raid_params> varies by <raid_type>. See 'parse_raid_params' for
|
|
* details on possible <raid_params>.
|
|
*
|
|
* Userspace is free to initialize the metadata devices, hence the superblocks to
|
|
* enforce recreation based on the passed in table parameters.
|
|
*
|
|
*/
|
|
static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
int r;
|
|
struct raid_type *rt;
|
|
unsigned num_raid_params, num_raid_devs;
|
|
struct raid_set *rs = NULL;
|
|
const char *arg;
|
|
struct dm_arg_set as = { argc, argv }, as_nrd;
|
|
struct dm_arg _args[] = {
|
|
{ 0, as.argc, "Cannot understand number of raid parameters" },
|
|
{ 1, 254, "Cannot understand number of raid devices parameters" }
|
|
};
|
|
|
|
/* Must have <raid_type> */
|
|
arg = dm_shift_arg(&as);
|
|
if (!arg) {
|
|
ti->error = "No arguments";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rt = get_raid_type(arg);
|
|
if (!rt) {
|
|
ti->error = "Unrecognised raid_type";
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Must have <#raid_params> */
|
|
if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
|
|
return -EINVAL;
|
|
|
|
/* number of raid device tupples <meta_dev data_dev> */
|
|
as_nrd = as;
|
|
dm_consume_args(&as_nrd, num_raid_params);
|
|
_args[1].max = (as_nrd.argc - 1) / 2;
|
|
if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
|
|
return -EINVAL;
|
|
|
|
if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
|
|
ti->error = "Invalid number of supplied raid devices";
|
|
return -EINVAL;
|
|
}
|
|
|
|
rs = context_alloc(ti, rt, num_raid_devs);
|
|
if (IS_ERR(rs))
|
|
return PTR_ERR(rs);
|
|
|
|
r = parse_raid_params(rs, &as, num_raid_params);
|
|
if (r)
|
|
goto bad;
|
|
|
|
r = parse_dev_params(rs, &as);
|
|
if (r)
|
|
goto bad;
|
|
|
|
rs->md.sync_super = super_sync;
|
|
|
|
/*
|
|
* Backup any new raid set level, layout, ...
|
|
* requested to be able to compare to superblock
|
|
* members for conversion decisions.
|
|
*/
|
|
rs_config_backup(rs);
|
|
|
|
r = analyse_superblocks(ti, rs);
|
|
if (r)
|
|
goto bad;
|
|
|
|
INIT_WORK(&rs->md.event_work, do_table_event);
|
|
ti->private = rs;
|
|
ti->num_flush_bios = 1;
|
|
|
|
/* Restore any requested new layout for conversion decision */
|
|
rs_config_restore(rs);
|
|
|
|
/*
|
|
* If a takeover is needed, just set the level to
|
|
* the new requested one and allow the raid set to run.
|
|
*/
|
|
if (rs_takeover_requested(rs)) {
|
|
r = rs_check_takeover(rs);
|
|
if (r)
|
|
return r;
|
|
|
|
r = rs_setup_takeover(rs);
|
|
if (r)
|
|
return r;
|
|
|
|
/* Tell preresume to update superblocks with new layout */
|
|
set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
|
|
rs_set_new(rs);
|
|
} else
|
|
rs_set_cur(rs);
|
|
|
|
/* Start raid set read-only and assumed clean to change in raid_resume() */
|
|
rs->md.ro = 1;
|
|
rs->md.in_sync = 1;
|
|
set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
|
|
|
|
/* Has to be held on running the array */
|
|
mddev_lock_nointr(&rs->md);
|
|
r = md_run(&rs->md);
|
|
rs->md.in_sync = 0; /* Assume already marked dirty */
|
|
mddev_unlock(&rs->md);
|
|
|
|
if (r) {
|
|
ti->error = "Fail to run raid array";
|
|
goto bad;
|
|
}
|
|
|
|
if (ti->len != rs->md.array_sectors) {
|
|
ti->error = "Array size does not match requested target length";
|
|
r = -EINVAL;
|
|
goto size_mismatch;
|
|
}
|
|
rs->callbacks.congested_fn = raid_is_congested;
|
|
dm_table_add_target_callbacks(ti->table, &rs->callbacks);
|
|
|
|
mddev_suspend(&rs->md);
|
|
return 0;
|
|
|
|
size_mismatch:
|
|
md_stop(&rs->md);
|
|
bad:
|
|
context_free(rs);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void raid_dtr(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
|
|
list_del_init(&rs->callbacks.list);
|
|
md_stop(&rs->md);
|
|
context_free(rs);
|
|
}
|
|
|
|
static int raid_map(struct dm_target *ti, struct bio *bio)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
mddev->pers->make_request(mddev, bio);
|
|
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
/* Return string describing the current sync action of @mddev */
|
|
static const char *decipher_sync_action(struct mddev *mddev)
|
|
{
|
|
if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
|
|
return "frozen";
|
|
|
|
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
|
|
(!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
|
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
|
|
return "reshape";
|
|
|
|
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
|
|
if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
|
|
return "resync";
|
|
else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
|
|
return "check";
|
|
return "repair";
|
|
}
|
|
|
|
if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
|
|
return "recover";
|
|
}
|
|
|
|
return "idle";
|
|
}
|
|
|
|
/*
|
|
* Return status string @rdev
|
|
*
|
|
* Status characters:
|
|
*
|
|
* 'D' = Dead/Failed device
|
|
* 'a' = Alive but not in-sync
|
|
* 'A' = Alive and in-sync
|
|
*/
|
|
static const char *_raid_dev_status(struct md_rdev *rdev, bool array_in_sync)
|
|
{
|
|
if (test_bit(Faulty, &rdev->flags))
|
|
return "D";
|
|
else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
|
|
return "a";
|
|
else
|
|
return "A";
|
|
}
|
|
|
|
/* Helper to return resync/reshape progress for @rs and @array_in_sync */
|
|
static sector_t rs_get_progress(struct raid_set *rs,
|
|
sector_t resync_max_sectors, bool *array_in_sync)
|
|
{
|
|
sector_t r, recovery_cp, curr_resync_completed;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
|
|
recovery_cp = mddev->recovery_cp;
|
|
*array_in_sync = false;
|
|
|
|
if (rs_is_raid0(rs)) {
|
|
r = resync_max_sectors;
|
|
*array_in_sync = true;
|
|
|
|
} else {
|
|
r = mddev->reshape_position;
|
|
|
|
/* Reshape is relative to the array size */
|
|
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
|
|
r != MaxSector) {
|
|
if (r == MaxSector) {
|
|
*array_in_sync = true;
|
|
r = resync_max_sectors;
|
|
} else {
|
|
/* Got to reverse on backward reshape */
|
|
if (mddev->reshape_backwards)
|
|
r = mddev->array_sectors - r;
|
|
|
|
/* Devide by # of data stripes */
|
|
sector_div(r, mddev_data_stripes(rs));
|
|
}
|
|
|
|
/* Sync is relative to the component device size */
|
|
} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
|
|
r = curr_resync_completed;
|
|
else
|
|
r = recovery_cp;
|
|
|
|
if (r == MaxSector) {
|
|
/*
|
|
* Sync complete.
|
|
*/
|
|
*array_in_sync = true;
|
|
r = resync_max_sectors;
|
|
} else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
|
|
/*
|
|
* If "check" or "repair" is occurring, the raid set has
|
|
* undergone an initial sync and the health characters
|
|
* should not be 'a' anymore.
|
|
*/
|
|
*array_in_sync = true;
|
|
} else {
|
|
struct md_rdev *rdev;
|
|
|
|
/*
|
|
* The raid set may be doing an initial sync, or it may
|
|
* be rebuilding individual components. If all the
|
|
* devices are In_sync, then it is the raid set that is
|
|
* being initialized.
|
|
*/
|
|
rdev_for_each(rdev, mddev)
|
|
if (!test_bit(In_sync, &rdev->flags))
|
|
*array_in_sync = true;
|
|
#if 0
|
|
r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Helper to return @dev name or "-" if !@dev */
|
|
static const char *_get_dev_name(struct dm_dev *dev)
|
|
{
|
|
return dev ? dev->name : "-";
|
|
}
|
|
|
|
static void raid_status(struct dm_target *ti, status_type_t type,
|
|
unsigned int status_flags, char *result, unsigned int maxlen)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
struct mddev *mddev = &rs->md;
|
|
struct r5conf *conf = mddev->private;
|
|
int max_nr_stripes = conf ? conf->max_nr_stripes : 0;
|
|
bool array_in_sync;
|
|
unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
|
|
unsigned int sz = 0;
|
|
unsigned int write_mostly_params = 0;
|
|
sector_t progress, resync_max_sectors, resync_mismatches;
|
|
const char *sync_action;
|
|
struct raid_type *rt;
|
|
struct md_rdev *rdev;
|
|
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
/* *Should* always succeed */
|
|
rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
|
|
if (!rt)
|
|
return;
|
|
|
|
DMEMIT("%s %d ", rt ? rt->name : "unknown", mddev->raid_disks);
|
|
|
|
/* Access most recent mddev properties for status output */
|
|
smp_rmb();
|
|
/* Get sensible max sectors even if raid set not yet started */
|
|
resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
|
|
mddev->resync_max_sectors : mddev->dev_sectors;
|
|
progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
|
|
resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
|
|
(unsigned int) atomic64_read(&mddev->resync_mismatches) : 0;
|
|
sync_action = decipher_sync_action(&rs->md);
|
|
|
|
/* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */
|
|
rdev_for_each(rdev, mddev)
|
|
DMEMIT(_raid_dev_status(rdev, array_in_sync));
|
|
|
|
/*
|
|
* In-sync/Reshape ratio:
|
|
* The in-sync ratio shows the progress of:
|
|
* - Initializing the raid set
|
|
* - Rebuilding a subset of devices of the raid set
|
|
* The user can distinguish between the two by referring
|
|
* to the status characters.
|
|
*
|
|
* The reshape ratio shows the progress of
|
|
* changing the raid layout or the number of
|
|
* disks of a raid set
|
|
*/
|
|
DMEMIT(" %llu/%llu", (unsigned long long) progress,
|
|
(unsigned long long) resync_max_sectors);
|
|
|
|
/*
|
|
* v1.5.0+:
|
|
*
|
|
* Sync action:
|
|
* See Documentation/device-mapper/dm-raid.txt for
|
|
* information on each of these states.
|
|
*/
|
|
DMEMIT(" %s", sync_action);
|
|
|
|
/*
|
|
* v1.5.0+:
|
|
*
|
|
* resync_mismatches/mismatch_cnt
|
|
* This field shows the number of discrepancies found when
|
|
* performing a "check" of the raid set.
|
|
*/
|
|
DMEMIT(" %llu", (unsigned long long) resync_mismatches);
|
|
|
|
/*
|
|
* v1.9.0+:
|
|
*
|
|
* data_offset (needed for out of space reshaping)
|
|
* This field shows the data offset into the data
|
|
* image LV where the first stripes data starts.
|
|
*
|
|
* We keep data_offset equal on all raid disks of the set,
|
|
* so retrieving it from the first raid disk is sufficient.
|
|
*/
|
|
DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
|
|
break;
|
|
|
|
case STATUSTYPE_TABLE:
|
|
/* Report the table line string you would use to construct this raid set */
|
|
|
|
/* Calculate raid parameter count */
|
|
rdev_for_each(rdev, mddev)
|
|
if (test_bit(WriteMostly, &rdev->flags))
|
|
write_mostly_params += 2;
|
|
raid_param_cnt += memweight(rs->rebuild_disks,
|
|
DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks)) * 2 +
|
|
write_mostly_params +
|
|
hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
|
|
hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
|
|
/* Emit table line */
|
|
DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
|
|
if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
|
|
DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
|
|
raid10_md_layout_to_format(mddev->layout));
|
|
if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
|
|
raid10_md_layout_to_copies(mddev->layout));
|
|
if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
|
|
DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
|
|
if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
|
|
DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
|
|
if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
|
|
DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
|
|
(unsigned long long) to_sector(mddev->bitmap_info.chunksize));
|
|
if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
|
|
DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
|
|
(unsigned long long) rs->data_offset);
|
|
if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
|
|
DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
|
|
mddev->bitmap_info.daemon_sleep);
|
|
if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
|
|
mddev->delta_disks);
|
|
if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
|
|
max_nr_stripes);
|
|
rdev_for_each(rdev, mddev)
|
|
if (test_bit(rdev->raid_disk, (void *) rs->rebuild_disks))
|
|
DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
|
|
rdev->raid_disk);
|
|
rdev_for_each(rdev, mddev)
|
|
if (test_bit(WriteMostly, &rdev->flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
|
|
rdev->raid_disk);
|
|
if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
|
|
DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
|
|
mddev->bitmap_info.max_write_behind);
|
|
if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
|
|
mddev->sync_speed_max);
|
|
if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
|
|
DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
|
|
mddev->sync_speed_min);
|
|
DMEMIT(" %d", rs->raid_disks);
|
|
rdev_for_each(rdev, mddev) {
|
|
struct raid_dev *rd = container_of(rdev, struct raid_dev, rdev);
|
|
|
|
DMEMIT(" %s %s", _get_dev_name(rd->meta_dev),
|
|
_get_dev_name(rd->data_dev));
|
|
}
|
|
}
|
|
}
|
|
|
|
static int raid_message(struct dm_target *ti, unsigned argc, char **argv)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
if (!strcasecmp(argv[0], "reshape")) {
|
|
DMERR("Reshape not supported.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!mddev->pers || !mddev->pers->sync_request)
|
|
return -EINVAL;
|
|
|
|
if (!strcasecmp(argv[0], "frozen"))
|
|
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
|
|
else
|
|
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
|
|
|
|
if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
|
|
if (mddev->sync_thread) {
|
|
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
|
|
md_reap_sync_thread(mddev);
|
|
}
|
|
} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
|
|
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
|
|
return -EBUSY;
|
|
else if (!strcasecmp(argv[0], "resync"))
|
|
; /* MD_RECOVERY_NEEDED set below */
|
|
else if (!strcasecmp(argv[0], "recover"))
|
|
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
|
|
else {
|
|
if (!strcasecmp(argv[0], "check"))
|
|
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
|
|
else if (!!strcasecmp(argv[0], "repair"))
|
|
return -EINVAL;
|
|
set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
|
|
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
|
|
}
|
|
if (mddev->ro == 2) {
|
|
/* A write to sync_action is enough to justify
|
|
* canceling read-auto mode
|
|
*/
|
|
mddev->ro = 0;
|
|
if (!mddev->suspended && mddev->sync_thread)
|
|
md_wakeup_thread(mddev->sync_thread);
|
|
}
|
|
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
|
|
if (!mddev->suspended && mddev->thread)
|
|
md_wakeup_thread(mddev->thread);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int raid_iterate_devices(struct dm_target *ti,
|
|
iterate_devices_callout_fn fn, void *data)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
unsigned i;
|
|
int r = 0;
|
|
|
|
for (i = 0; !r && i < rs->md.raid_disks; i++)
|
|
if (rs->dev[i].data_dev)
|
|
r = fn(ti,
|
|
rs->dev[i].data_dev,
|
|
0, /* No offset on data devs */
|
|
rs->md.dev_sectors,
|
|
data);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
unsigned chunk_size = rs->md.chunk_sectors << 9;
|
|
struct r5conf *conf = rs->md.private;
|
|
|
|
blk_limits_io_min(limits, chunk_size);
|
|
blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded));
|
|
}
|
|
|
|
static void raid_presuspend(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
|
|
md_stop_writes(&rs->md);
|
|
}
|
|
|
|
static void raid_postsuspend(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
|
|
mddev_suspend(&rs->md);
|
|
}
|
|
|
|
static void attempt_restore_of_faulty_devices(struct raid_set *rs)
|
|
{
|
|
int i;
|
|
uint64_t failed_devices, cleared_failed_devices = 0;
|
|
unsigned long flags;
|
|
struct dm_raid_superblock *sb;
|
|
struct md_rdev *r;
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
r = &rs->dev[i].rdev;
|
|
if (test_bit(Faulty, &r->flags) && r->sb_page &&
|
|
sync_page_io(r, 0, r->sb_size, r->sb_page, REQ_OP_READ, 0,
|
|
1)) {
|
|
DMINFO("Faulty %s device #%d has readable super block."
|
|
" Attempting to revive it.",
|
|
rs->raid_type->name, i);
|
|
|
|
/*
|
|
* Faulty bit may be set, but sometimes the array can
|
|
* be suspended before the personalities can respond
|
|
* by removing the device from the array (i.e. calling
|
|
* 'hot_remove_disk'). If they haven't yet removed
|
|
* the failed device, its 'raid_disk' number will be
|
|
* '>= 0' - meaning we must call this function
|
|
* ourselves.
|
|
*/
|
|
if ((r->raid_disk >= 0) &&
|
|
(r->mddev->pers->hot_remove_disk(r->mddev, r) != 0))
|
|
/* Failed to revive this device, try next */
|
|
continue;
|
|
|
|
r->raid_disk = i;
|
|
r->saved_raid_disk = i;
|
|
flags = r->flags;
|
|
clear_bit(Faulty, &r->flags);
|
|
clear_bit(WriteErrorSeen, &r->flags);
|
|
clear_bit(In_sync, &r->flags);
|
|
if (r->mddev->pers->hot_add_disk(r->mddev, r)) {
|
|
r->raid_disk = -1;
|
|
r->saved_raid_disk = -1;
|
|
r->flags = flags;
|
|
} else {
|
|
r->recovery_offset = 0;
|
|
cleared_failed_devices |= 1 << i;
|
|
}
|
|
}
|
|
}
|
|
if (cleared_failed_devices) {
|
|
rdev_for_each(r, &rs->md) {
|
|
sb = page_address(r->sb_page);
|
|
failed_devices = le64_to_cpu(sb->failed_devices);
|
|
failed_devices &= ~cleared_failed_devices;
|
|
sb->failed_devices = cpu_to_le64(failed_devices);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Load the dirty region bitmap */
|
|
static int _bitmap_load(struct raid_set *rs)
|
|
{
|
|
int r = 0;
|
|
|
|
/* Try loading the bitmap unless "raid0", which does not have one */
|
|
if (!rs_is_raid0(rs) &&
|
|
!test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
|
|
r = bitmap_load(&rs->md);
|
|
if (r)
|
|
DMERR("Failed to load bitmap");
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int raid_preresume(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
/* This is a resume after a suspend of the set -> it's already started */
|
|
if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
|
|
return 0;
|
|
|
|
/*
|
|
* The superblocks need to be updated on disk if the
|
|
* array is new or _bitmap_load will overwrite them
|
|
* in core with old data.
|
|
*
|
|
* In case the array got modified (takeover/reshape/resize)
|
|
* or the data offsets on the component devices changed, they
|
|
* have to be updated as well.
|
|
*
|
|
* Have to switch to readwrite and back in order to
|
|
* allow for the superblock updates.
|
|
*/
|
|
if (test_and_clear_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags)) {
|
|
set_bit(MD_CHANGE_DEVS, &mddev->flags);
|
|
mddev->ro = 0;
|
|
md_update_sb(mddev, 1);
|
|
mddev->ro = 1;
|
|
}
|
|
|
|
/*
|
|
* Disable/enable discard support on raid set after any
|
|
* conversion, because devices can have been added
|
|
*/
|
|
configure_discard_support(rs);
|
|
|
|
/* Load the bitmap from disk unless raid0 */
|
|
return _bitmap_load(rs);
|
|
}
|
|
|
|
static void raid_resume(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
struct mddev *mddev = &rs->md;
|
|
|
|
if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
|
|
/*
|
|
* A secondary resume while the device is active.
|
|
* Take this opportunity to check whether any failed
|
|
* devices are reachable again.
|
|
*/
|
|
attempt_restore_of_faulty_devices(rs);
|
|
}
|
|
|
|
mddev->ro = 0;
|
|
mddev->in_sync = 0;
|
|
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
|
|
|
|
if (mddev->suspended)
|
|
mddev_resume(mddev);
|
|
}
|
|
|
|
static struct target_type raid_target = {
|
|
.name = "raid",
|
|
.version = {1, 9, 0},
|
|
.module = THIS_MODULE,
|
|
.ctr = raid_ctr,
|
|
.dtr = raid_dtr,
|
|
.map = raid_map,
|
|
.status = raid_status,
|
|
.message = raid_message,
|
|
.iterate_devices = raid_iterate_devices,
|
|
.io_hints = raid_io_hints,
|
|
.presuspend = raid_presuspend,
|
|
.postsuspend = raid_postsuspend,
|
|
.preresume = raid_preresume,
|
|
.resume = raid_resume,
|
|
};
|
|
|
|
static int __init dm_raid_init(void)
|
|
{
|
|
DMINFO("Loading target version %u.%u.%u",
|
|
raid_target.version[0],
|
|
raid_target.version[1],
|
|
raid_target.version[2]);
|
|
return dm_register_target(&raid_target);
|
|
}
|
|
|
|
static void __exit dm_raid_exit(void)
|
|
{
|
|
dm_unregister_target(&raid_target);
|
|
}
|
|
|
|
module_init(dm_raid_init);
|
|
module_exit(dm_raid_exit);
|
|
|
|
module_param(devices_handle_discard_safely, bool, 0644);
|
|
MODULE_PARM_DESC(devices_handle_discard_safely,
|
|
"Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
|
|
MODULE_ALIAS("dm-raid0");
|
|
MODULE_ALIAS("dm-raid1");
|
|
MODULE_ALIAS("dm-raid10");
|
|
MODULE_ALIAS("dm-raid4");
|
|
MODULE_ALIAS("dm-raid5");
|
|
MODULE_ALIAS("dm-raid6");
|
|
MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
|
|
MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|