694 lines
18 KiB
C
694 lines
18 KiB
C
/*
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* Copyright (C) 2010-2011 Neil Brown
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* Copyright (C) 2010-2011 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 "md.h"
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#include "raid5.h"
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#include "dm.h"
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#include "bitmap.h"
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#define DM_MSG_PREFIX "raid"
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/*
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* If the MD doesn't support MD_SYNC_STATE_FORCED yet, then
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* make it so the flag doesn't set anything.
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*/
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#ifndef MD_SYNC_STATE_FORCED
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#define MD_SYNC_STATE_FORCED 0
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#endif
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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 mdk_rdev_s rdev;
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};
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/*
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* Flags for rs->print_flags field.
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*/
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#define DMPF_SYNC 0x1
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#define DMPF_NOSYNC 0x2
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#define DMPF_REBUILD 0x4
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#define DMPF_DAEMON_SLEEP 0x8
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#define DMPF_MIN_RECOVERY_RATE 0x10
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#define DMPF_MAX_RECOVERY_RATE 0x20
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#define DMPF_MAX_WRITE_BEHIND 0x40
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#define DMPF_STRIPE_CACHE 0x80
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struct raid_set {
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struct dm_target *ti;
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uint64_t print_flags;
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struct mddev_s md;
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struct raid_type *raid_type;
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struct dm_target_callbacks callbacks;
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struct raid_dev dev[0];
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};
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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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{"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0},
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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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{"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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{"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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};
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static struct raid_type *get_raid_type(char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(raid_types); i++)
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if (!strcmp(raid_types[i].name, name))
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return &raid_types[i];
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return NULL;
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}
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static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs)
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{
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unsigned i;
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struct raid_set *rs;
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sector_t sectors_per_dev;
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if (raid_devs <= raid_type->parity_devs) {
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ti->error = "Insufficient number of devices";
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return ERR_PTR(-EINVAL);
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}
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sectors_per_dev = ti->len;
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if (sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
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ti->error = "Target length not divisible by number of data devices";
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return ERR_PTR(-EINVAL);
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}
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rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
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if (!rs) {
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ti->error = "Cannot allocate raid context";
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return ERR_PTR(-ENOMEM);
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}
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mddev_init(&rs->md);
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rs->ti = ti;
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rs->raid_type = raid_type;
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rs->md.raid_disks = raid_devs;
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rs->md.level = raid_type->level;
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rs->md.new_level = rs->md.level;
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rs->md.dev_sectors = sectors_per_dev;
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rs->md.layout = raid_type->algorithm;
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rs->md.new_layout = rs->md.layout;
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rs->md.delta_disks = 0;
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rs->md.recovery_cp = 0;
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for (i = 0; i < raid_devs; i++)
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md_rdev_init(&rs->dev[i].rdev);
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/*
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* Remaining items to be initialized by further RAID params:
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* rs->md.persistent
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* rs->md.external
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* rs->md.chunk_sectors
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* rs->md.new_chunk_sectors
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*/
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return rs;
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}
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static void context_free(struct raid_set *rs)
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{
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int i;
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for (i = 0; i < rs->md.raid_disks; i++)
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if (rs->dev[i].data_dev)
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dm_put_device(rs->ti, rs->dev[i].data_dev);
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kfree(rs);
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}
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/*
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* For every device we have two words
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* <meta_dev>: meta device name or '-' if missing
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* <data_dev>: data device name or '-' if missing
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*
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* This code parses those words.
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*/
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static int dev_parms(struct raid_set *rs, char **argv)
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{
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int i;
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int rebuild = 0;
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int metadata_available = 0;
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int ret = 0;
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for (i = 0; i < rs->md.raid_disks; i++, argv += 2) {
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rs->dev[i].rdev.raid_disk = i;
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rs->dev[i].meta_dev = NULL;
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rs->dev[i].data_dev = NULL;
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/*
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* There are no offsets, since there is a separate device
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* for data and metadata.
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*/
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rs->dev[i].rdev.data_offset = 0;
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rs->dev[i].rdev.mddev = &rs->md;
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if (strcmp(argv[0], "-")) {
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rs->ti->error = "Metadata devices not supported";
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return -EINVAL;
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}
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if (!strcmp(argv[1], "-")) {
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if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
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(!rs->dev[i].rdev.recovery_offset)) {
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rs->ti->error = "Drive designated for rebuild not specified";
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return -EINVAL;
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}
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continue;
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}
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ret = dm_get_device(rs->ti, argv[1],
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dm_table_get_mode(rs->ti->table),
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&rs->dev[i].data_dev);
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if (ret) {
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rs->ti->error = "RAID device lookup failure";
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return ret;
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}
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rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
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list_add(&rs->dev[i].rdev.same_set, &rs->md.disks);
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if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
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rebuild++;
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}
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if (metadata_available) {
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rs->md.external = 0;
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rs->md.persistent = 1;
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rs->md.major_version = 2;
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} else if (rebuild && !rs->md.recovery_cp) {
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/*
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* Without metadata, we will not be able to tell if the array
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* is in-sync or not - we must assume it is not. Therefore,
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* it is impossible to rebuild a drive.
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*
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* Even if there is metadata, the on-disk information may
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* indicate that the array is not in-sync and it will then
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* fail at that time.
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*
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* User could specify 'nosync' option if desperate.
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*/
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DMERR("Unable to rebuild drive while array is not in-sync");
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rs->ti->error = "RAID device lookup failure";
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Possible arguments are...
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* RAID456:
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* <chunk_size> [optional_args]
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*
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* Optional args:
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* [[no]sync] Force or prevent recovery of the entire array
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* [rebuild <idx>] Rebuild the drive indicated by the index
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* [daemon_sleep <ms>] Time between bitmap daemon work to clear bits
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* [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
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* [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
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* [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
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* [stripe_cache <sectors>] Stripe cache size for higher RAIDs
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*/
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static int parse_raid_params(struct raid_set *rs, char **argv,
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unsigned num_raid_params)
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{
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unsigned i, rebuild_cnt = 0;
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unsigned long value;
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char *key;
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/*
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* First, parse the in-order required arguments
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*/
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if ((strict_strtoul(argv[0], 10, &value) < 0) ||
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!is_power_of_2(value) || (value < 8)) {
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rs->ti->error = "Bad chunk size";
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return -EINVAL;
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}
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rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
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argv++;
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num_raid_params--;
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/*
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* Second, parse the unordered optional arguments
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*/
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for (i = 0; i < rs->md.raid_disks; i++)
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set_bit(In_sync, &rs->dev[i].rdev.flags);
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for (i = 0; i < num_raid_params; i++) {
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if (!strcasecmp(argv[i], "nosync")) {
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rs->md.recovery_cp = MaxSector;
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rs->print_flags |= DMPF_NOSYNC;
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rs->md.flags |= MD_SYNC_STATE_FORCED;
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continue;
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}
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if (!strcasecmp(argv[i], "sync")) {
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rs->md.recovery_cp = 0;
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rs->print_flags |= DMPF_SYNC;
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rs->md.flags |= MD_SYNC_STATE_FORCED;
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continue;
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}
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/* The rest of the optional arguments come in key/value pairs */
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if ((i + 1) >= num_raid_params) {
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rs->ti->error = "Wrong number of raid parameters given";
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return -EINVAL;
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}
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key = argv[i++];
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if (strict_strtoul(argv[i], 10, &value) < 0) {
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rs->ti->error = "Bad numerical argument given in raid params";
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return -EINVAL;
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}
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if (!strcasecmp(key, "rebuild")) {
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if (++rebuild_cnt > rs->raid_type->parity_devs) {
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rs->ti->error = "Too many rebuild drives given";
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return -EINVAL;
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}
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if (value > rs->md.raid_disks) {
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rs->ti->error = "Invalid rebuild index given";
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return -EINVAL;
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}
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clear_bit(In_sync, &rs->dev[value].rdev.flags);
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rs->dev[value].rdev.recovery_offset = 0;
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rs->print_flags |= DMPF_REBUILD;
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} else if (!strcasecmp(key, "max_write_behind")) {
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rs->print_flags |= DMPF_MAX_WRITE_BEHIND;
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/*
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* In device-mapper, we specify things in sectors, but
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* MD records this value in kB
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*/
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value /= 2;
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if (value > COUNTER_MAX) {
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rs->ti->error = "Max write-behind limit out of range";
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return -EINVAL;
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}
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rs->md.bitmap_info.max_write_behind = value;
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} else if (!strcasecmp(key, "daemon_sleep")) {
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rs->print_flags |= DMPF_DAEMON_SLEEP;
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if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
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rs->ti->error = "daemon sleep period out of range";
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return -EINVAL;
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}
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rs->md.bitmap_info.daemon_sleep = value;
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} else if (!strcasecmp(key, "stripe_cache")) {
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rs->print_flags |= DMPF_STRIPE_CACHE;
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/*
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* In device-mapper, we specify things in sectors, but
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* MD records this value in kB
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*/
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value /= 2;
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if (rs->raid_type->level < 5) {
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rs->ti->error = "Inappropriate argument: stripe_cache";
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return -EINVAL;
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}
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if (raid5_set_cache_size(&rs->md, (int)value)) {
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rs->ti->error = "Bad stripe_cache size";
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return -EINVAL;
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}
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} else if (!strcasecmp(key, "min_recovery_rate")) {
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rs->print_flags |= DMPF_MIN_RECOVERY_RATE;
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if (value > INT_MAX) {
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rs->ti->error = "min_recovery_rate out of range";
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return -EINVAL;
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}
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rs->md.sync_speed_min = (int)value;
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} else if (!strcasecmp(key, "max_recovery_rate")) {
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rs->print_flags |= DMPF_MAX_RECOVERY_RATE;
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if (value > INT_MAX) {
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rs->ti->error = "max_recovery_rate out of range";
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return -EINVAL;
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}
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rs->md.sync_speed_max = (int)value;
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} else {
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DMERR("Unable to parse RAID parameter: %s", key);
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rs->ti->error = "Unable to parse RAID parameters";
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return -EINVAL;
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}
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}
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/* Assume there are no metadata devices until the drives are parsed */
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rs->md.persistent = 0;
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rs->md.external = 1;
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return 0;
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}
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static void do_table_event(struct work_struct *ws)
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{
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struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
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dm_table_event(rs->ti->table);
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}
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static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
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{
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struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
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return md_raid5_congested(&rs->md, bits);
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}
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/*
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* Construct a RAID4/5/6 mapping:
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* Args:
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* <raid_type> <#raid_params> <raid_params> \
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* <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> }
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*
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* ** metadata devices are not supported yet, use '-' instead **
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*
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* <raid_params> varies by <raid_type>. See 'parse_raid_params' for
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* details on possible <raid_params>.
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*/
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static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
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{
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int ret;
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struct raid_type *rt;
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unsigned long num_raid_params, num_raid_devs;
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struct raid_set *rs = NULL;
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/* Must have at least <raid_type> <#raid_params> */
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if (argc < 2) {
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ti->error = "Too few arguments";
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return -EINVAL;
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}
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/* raid type */
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rt = get_raid_type(argv[0]);
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if (!rt) {
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ti->error = "Unrecognised raid_type";
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return -EINVAL;
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}
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argc--;
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argv++;
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/* number of RAID parameters */
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if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) {
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ti->error = "Cannot understand number of RAID parameters";
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return -EINVAL;
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}
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argc--;
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argv++;
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/* Skip over RAID params for now and find out # of devices */
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if (num_raid_params + 1 > argc) {
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ti->error = "Arguments do not agree with counts given";
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return -EINVAL;
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}
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if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) ||
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(num_raid_devs >= INT_MAX)) {
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ti->error = "Cannot understand number of raid devices";
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return -EINVAL;
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}
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rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
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if (IS_ERR(rs))
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return PTR_ERR(rs);
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ret = parse_raid_params(rs, argv, (unsigned)num_raid_params);
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if (ret)
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goto bad;
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ret = -EINVAL;
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argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
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argv += num_raid_params + 1;
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if (argc != (num_raid_devs * 2)) {
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ti->error = "Supplied RAID devices does not match the count given";
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goto bad;
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}
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ret = dev_parms(rs, argv);
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if (ret)
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goto bad;
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INIT_WORK(&rs->md.event_work, do_table_event);
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ti->split_io = rs->md.chunk_sectors;
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ti->private = rs;
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mutex_lock(&rs->md.reconfig_mutex);
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ret = md_run(&rs->md);
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rs->md.in_sync = 0; /* Assume already marked dirty */
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mutex_unlock(&rs->md.reconfig_mutex);
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if (ret) {
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ti->error = "Fail to run raid array";
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goto bad;
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}
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rs->callbacks.congested_fn = raid_is_congested;
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dm_table_add_target_callbacks(ti->table, &rs->callbacks);
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return 0;
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bad:
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context_free(rs);
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return ret;
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}
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static void raid_dtr(struct dm_target *ti)
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{
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struct raid_set *rs = ti->private;
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list_del_init(&rs->callbacks.list);
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md_stop(&rs->md);
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context_free(rs);
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}
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static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context)
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{
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struct raid_set *rs = ti->private;
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mddev_t *mddev = &rs->md;
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|
|
mddev->pers->make_request(mddev, bio);
|
|
|
|
return DM_MAPIO_SUBMITTED;
|
|
}
|
|
|
|
static int raid_status(struct dm_target *ti, status_type_t type,
|
|
char *result, unsigned maxlen)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
unsigned raid_param_cnt = 1; /* at least 1 for chunksize */
|
|
unsigned sz = 0;
|
|
int i;
|
|
sector_t sync;
|
|
|
|
switch (type) {
|
|
case STATUSTYPE_INFO:
|
|
DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks);
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
if (test_bit(Faulty, &rs->dev[i].rdev.flags))
|
|
DMEMIT("D");
|
|
else if (test_bit(In_sync, &rs->dev[i].rdev.flags))
|
|
DMEMIT("A");
|
|
else
|
|
DMEMIT("a");
|
|
}
|
|
|
|
if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery))
|
|
sync = rs->md.curr_resync_completed;
|
|
else
|
|
sync = rs->md.recovery_cp;
|
|
|
|
if (sync > rs->md.resync_max_sectors)
|
|
sync = rs->md.resync_max_sectors;
|
|
|
|
DMEMIT(" %llu/%llu",
|
|
(unsigned long long) sync,
|
|
(unsigned long long) rs->md.resync_max_sectors);
|
|
|
|
break;
|
|
case STATUSTYPE_TABLE:
|
|
/* The string you would use to construct this array */
|
|
for (i = 0; i < rs->md.raid_disks; i++)
|
|
if ((rs->print_flags & DMPF_REBUILD) &&
|
|
rs->dev[i].data_dev &&
|
|
!test_bit(In_sync, &rs->dev[i].rdev.flags))
|
|
raid_param_cnt += 2; /* for rebuilds */
|
|
|
|
raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2);
|
|
if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))
|
|
raid_param_cnt--;
|
|
|
|
DMEMIT("%s %u %u", rs->raid_type->name,
|
|
raid_param_cnt, rs->md.chunk_sectors);
|
|
|
|
if ((rs->print_flags & DMPF_SYNC) &&
|
|
(rs->md.recovery_cp == MaxSector))
|
|
DMEMIT(" sync");
|
|
if (rs->print_flags & DMPF_NOSYNC)
|
|
DMEMIT(" nosync");
|
|
|
|
for (i = 0; i < rs->md.raid_disks; i++)
|
|
if ((rs->print_flags & DMPF_REBUILD) &&
|
|
rs->dev[i].data_dev &&
|
|
!test_bit(In_sync, &rs->dev[i].rdev.flags))
|
|
DMEMIT(" rebuild %u", i);
|
|
|
|
if (rs->print_flags & DMPF_DAEMON_SLEEP)
|
|
DMEMIT(" daemon_sleep %lu",
|
|
rs->md.bitmap_info.daemon_sleep);
|
|
|
|
if (rs->print_flags & DMPF_MIN_RECOVERY_RATE)
|
|
DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min);
|
|
|
|
if (rs->print_flags & DMPF_MAX_RECOVERY_RATE)
|
|
DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);
|
|
|
|
if (rs->print_flags & DMPF_MAX_WRITE_BEHIND)
|
|
DMEMIT(" max_write_behind %lu",
|
|
rs->md.bitmap_info.max_write_behind);
|
|
|
|
if (rs->print_flags & DMPF_STRIPE_CACHE) {
|
|
raid5_conf_t *conf = rs->md.private;
|
|
|
|
/* convert from kiB to sectors */
|
|
DMEMIT(" stripe_cache %d",
|
|
conf ? conf->max_nr_stripes * 2 : 0);
|
|
}
|
|
|
|
DMEMIT(" %d", rs->md.raid_disks);
|
|
for (i = 0; i < rs->md.raid_disks; i++) {
|
|
DMEMIT(" -"); /* metadata device */
|
|
|
|
if (rs->dev[i].data_dev)
|
|
DMEMIT(" %s", rs->dev[i].data_dev->name);
|
|
else
|
|
DMEMIT(" -");
|
|
}
|
|
}
|
|
|
|
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 ret = 0;
|
|
|
|
for (i = 0; !ret && i < rs->md.raid_disks; i++)
|
|
if (rs->dev[i].data_dev)
|
|
ret = fn(ti,
|
|
rs->dev[i].data_dev,
|
|
0, /* No offset on data devs */
|
|
rs->md.dev_sectors,
|
|
data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
raid5_conf_t *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 raid_resume(struct dm_target *ti)
|
|
{
|
|
struct raid_set *rs = ti->private;
|
|
|
|
mddev_resume(&rs->md);
|
|
}
|
|
|
|
static struct target_type raid_target = {
|
|
.name = "raid",
|
|
.version = {1, 0, 0},
|
|
.module = THIS_MODULE,
|
|
.ctr = raid_ctr,
|
|
.dtr = raid_dtr,
|
|
.map = raid_map,
|
|
.status = raid_status,
|
|
.iterate_devices = raid_iterate_devices,
|
|
.io_hints = raid_io_hints,
|
|
.presuspend = raid_presuspend,
|
|
.postsuspend = raid_postsuspend,
|
|
.resume = raid_resume,
|
|
};
|
|
|
|
static int __init dm_raid_init(void)
|
|
{
|
|
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_DESCRIPTION(DM_NAME " raid4/5/6 target");
|
|
MODULE_ALIAS("dm-raid4");
|
|
MODULE_ALIAS("dm-raid5");
|
|
MODULE_ALIAS("dm-raid6");
|
|
MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|