mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 01:56:40 +07:00
c83057a1f4
This makes md raid 0 support TRIM. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de>
758 lines
20 KiB
C
758 lines
20 KiB
C
/*
|
|
raid0.c : Multiple Devices driver for Linux
|
|
Copyright (C) 1994-96 Marc ZYNGIER
|
|
<zyngier@ufr-info-p7.ibp.fr> or
|
|
<maz@gloups.fdn.fr>
|
|
Copyright (C) 1999, 2000 Ingo Molnar, Red Hat
|
|
|
|
|
|
RAID-0 management functions.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
(for example /usr/src/linux/COPYING); if not, write to the Free
|
|
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include "md.h"
|
|
#include "raid0.h"
|
|
#include "raid5.h"
|
|
|
|
static int raid0_congested(void *data, int bits)
|
|
{
|
|
struct mddev *mddev = data;
|
|
struct r0conf *conf = mddev->private;
|
|
struct md_rdev **devlist = conf->devlist;
|
|
int raid_disks = conf->strip_zone[0].nb_dev;
|
|
int i, ret = 0;
|
|
|
|
if (mddev_congested(mddev, bits))
|
|
return 1;
|
|
|
|
for (i = 0; i < raid_disks && !ret ; i++) {
|
|
struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
|
|
|
|
ret |= bdi_congested(&q->backing_dev_info, bits);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* inform the user of the raid configuration
|
|
*/
|
|
static void dump_zones(struct mddev *mddev)
|
|
{
|
|
int j, k;
|
|
sector_t zone_size = 0;
|
|
sector_t zone_start = 0;
|
|
char b[BDEVNAME_SIZE];
|
|
struct r0conf *conf = mddev->private;
|
|
int raid_disks = conf->strip_zone[0].nb_dev;
|
|
printk(KERN_INFO "md: RAID0 configuration for %s - %d zone%s\n",
|
|
mdname(mddev),
|
|
conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s");
|
|
for (j = 0; j < conf->nr_strip_zones; j++) {
|
|
printk(KERN_INFO "md: zone%d=[", j);
|
|
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
|
|
printk(KERN_CONT "%s%s", k?"/":"",
|
|
bdevname(conf->devlist[j*raid_disks
|
|
+ k]->bdev, b));
|
|
printk(KERN_CONT "]\n");
|
|
|
|
zone_size = conf->strip_zone[j].zone_end - zone_start;
|
|
printk(KERN_INFO " zone-offset=%10lluKB, "
|
|
"device-offset=%10lluKB, size=%10lluKB\n",
|
|
(unsigned long long)zone_start>>1,
|
|
(unsigned long long)conf->strip_zone[j].dev_start>>1,
|
|
(unsigned long long)zone_size>>1);
|
|
zone_start = conf->strip_zone[j].zone_end;
|
|
}
|
|
printk(KERN_INFO "\n");
|
|
}
|
|
|
|
static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
|
|
{
|
|
int i, c, err;
|
|
sector_t curr_zone_end, sectors;
|
|
struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev;
|
|
struct strip_zone *zone;
|
|
int cnt;
|
|
char b[BDEVNAME_SIZE];
|
|
char b2[BDEVNAME_SIZE];
|
|
struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
|
|
bool discard_supported = false;
|
|
|
|
if (!conf)
|
|
return -ENOMEM;
|
|
rdev_for_each(rdev1, mddev) {
|
|
pr_debug("md/raid0:%s: looking at %s\n",
|
|
mdname(mddev),
|
|
bdevname(rdev1->bdev, b));
|
|
c = 0;
|
|
|
|
/* round size to chunk_size */
|
|
sectors = rdev1->sectors;
|
|
sector_div(sectors, mddev->chunk_sectors);
|
|
rdev1->sectors = sectors * mddev->chunk_sectors;
|
|
|
|
rdev_for_each(rdev2, mddev) {
|
|
pr_debug("md/raid0:%s: comparing %s(%llu)"
|
|
" with %s(%llu)\n",
|
|
mdname(mddev),
|
|
bdevname(rdev1->bdev,b),
|
|
(unsigned long long)rdev1->sectors,
|
|
bdevname(rdev2->bdev,b2),
|
|
(unsigned long long)rdev2->sectors);
|
|
if (rdev2 == rdev1) {
|
|
pr_debug("md/raid0:%s: END\n",
|
|
mdname(mddev));
|
|
break;
|
|
}
|
|
if (rdev2->sectors == rdev1->sectors) {
|
|
/*
|
|
* Not unique, don't count it as a new
|
|
* group
|
|
*/
|
|
pr_debug("md/raid0:%s: EQUAL\n",
|
|
mdname(mddev));
|
|
c = 1;
|
|
break;
|
|
}
|
|
pr_debug("md/raid0:%s: NOT EQUAL\n",
|
|
mdname(mddev));
|
|
}
|
|
if (!c) {
|
|
pr_debug("md/raid0:%s: ==> UNIQUE\n",
|
|
mdname(mddev));
|
|
conf->nr_strip_zones++;
|
|
pr_debug("md/raid0:%s: %d zones\n",
|
|
mdname(mddev), conf->nr_strip_zones);
|
|
}
|
|
}
|
|
pr_debug("md/raid0:%s: FINAL %d zones\n",
|
|
mdname(mddev), conf->nr_strip_zones);
|
|
err = -ENOMEM;
|
|
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
|
|
conf->nr_strip_zones, GFP_KERNEL);
|
|
if (!conf->strip_zone)
|
|
goto abort;
|
|
conf->devlist = kzalloc(sizeof(struct md_rdev*)*
|
|
conf->nr_strip_zones*mddev->raid_disks,
|
|
GFP_KERNEL);
|
|
if (!conf->devlist)
|
|
goto abort;
|
|
|
|
/* The first zone must contain all devices, so here we check that
|
|
* there is a proper alignment of slots to devices and find them all
|
|
*/
|
|
zone = &conf->strip_zone[0];
|
|
cnt = 0;
|
|
smallest = NULL;
|
|
dev = conf->devlist;
|
|
err = -EINVAL;
|
|
rdev_for_each(rdev1, mddev) {
|
|
int j = rdev1->raid_disk;
|
|
|
|
if (mddev->level == 10) {
|
|
/* taking over a raid10-n2 array */
|
|
j /= 2;
|
|
rdev1->new_raid_disk = j;
|
|
}
|
|
|
|
if (mddev->level == 1) {
|
|
/* taiking over a raid1 array-
|
|
* we have only one active disk
|
|
*/
|
|
j = 0;
|
|
rdev1->new_raid_disk = j;
|
|
}
|
|
|
|
if (j < 0 || j >= mddev->raid_disks) {
|
|
printk(KERN_ERR "md/raid0:%s: bad disk number %d - "
|
|
"aborting!\n", mdname(mddev), j);
|
|
goto abort;
|
|
}
|
|
if (dev[j]) {
|
|
printk(KERN_ERR "md/raid0:%s: multiple devices for %d - "
|
|
"aborting!\n", mdname(mddev), j);
|
|
goto abort;
|
|
}
|
|
dev[j] = rdev1;
|
|
|
|
disk_stack_limits(mddev->gendisk, rdev1->bdev,
|
|
rdev1->data_offset << 9);
|
|
|
|
if (rdev1->bdev->bd_disk->queue->merge_bvec_fn)
|
|
conf->has_merge_bvec = 1;
|
|
|
|
if (!smallest || (rdev1->sectors < smallest->sectors))
|
|
smallest = rdev1;
|
|
cnt++;
|
|
|
|
if (blk_queue_discard(bdev_get_queue(rdev1->bdev)))
|
|
discard_supported = true;
|
|
}
|
|
if (cnt != mddev->raid_disks) {
|
|
printk(KERN_ERR "md/raid0:%s: too few disks (%d of %d) - "
|
|
"aborting!\n", mdname(mddev), cnt, mddev->raid_disks);
|
|
goto abort;
|
|
}
|
|
zone->nb_dev = cnt;
|
|
zone->zone_end = smallest->sectors * cnt;
|
|
|
|
curr_zone_end = zone->zone_end;
|
|
|
|
/* now do the other zones */
|
|
for (i = 1; i < conf->nr_strip_zones; i++)
|
|
{
|
|
int j;
|
|
|
|
zone = conf->strip_zone + i;
|
|
dev = conf->devlist + i * mddev->raid_disks;
|
|
|
|
pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i);
|
|
zone->dev_start = smallest->sectors;
|
|
smallest = NULL;
|
|
c = 0;
|
|
|
|
for (j=0; j<cnt; j++) {
|
|
rdev = conf->devlist[j];
|
|
if (rdev->sectors <= zone->dev_start) {
|
|
pr_debug("md/raid0:%s: checking %s ... nope\n",
|
|
mdname(mddev),
|
|
bdevname(rdev->bdev, b));
|
|
continue;
|
|
}
|
|
pr_debug("md/raid0:%s: checking %s ..."
|
|
" contained as device %d\n",
|
|
mdname(mddev),
|
|
bdevname(rdev->bdev, b), c);
|
|
dev[c] = rdev;
|
|
c++;
|
|
if (!smallest || rdev->sectors < smallest->sectors) {
|
|
smallest = rdev;
|
|
pr_debug("md/raid0:%s: (%llu) is smallest!.\n",
|
|
mdname(mddev),
|
|
(unsigned long long)rdev->sectors);
|
|
}
|
|
}
|
|
|
|
zone->nb_dev = c;
|
|
sectors = (smallest->sectors - zone->dev_start) * c;
|
|
pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
|
|
mdname(mddev),
|
|
zone->nb_dev, (unsigned long long)sectors);
|
|
|
|
curr_zone_end += sectors;
|
|
zone->zone_end = curr_zone_end;
|
|
|
|
pr_debug("md/raid0:%s: current zone start: %llu\n",
|
|
mdname(mddev),
|
|
(unsigned long long)smallest->sectors);
|
|
}
|
|
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
|
|
mddev->queue->backing_dev_info.congested_data = mddev;
|
|
|
|
/*
|
|
* now since we have the hard sector sizes, we can make sure
|
|
* chunk size is a multiple of that sector size
|
|
*/
|
|
if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
|
|
printk(KERN_ERR "md/raid0:%s: chunk_size of %d not valid\n",
|
|
mdname(mddev),
|
|
mddev->chunk_sectors << 9);
|
|
goto abort;
|
|
}
|
|
|
|
blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
|
|
blk_queue_io_opt(mddev->queue,
|
|
(mddev->chunk_sectors << 9) * mddev->raid_disks);
|
|
|
|
if (!discard_supported)
|
|
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
|
|
else
|
|
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
|
|
|
|
pr_debug("md/raid0:%s: done.\n", mdname(mddev));
|
|
*private_conf = conf;
|
|
|
|
return 0;
|
|
abort:
|
|
kfree(conf->strip_zone);
|
|
kfree(conf->devlist);
|
|
kfree(conf);
|
|
*private_conf = NULL;
|
|
return err;
|
|
}
|
|
|
|
/* Find the zone which holds a particular offset
|
|
* Update *sectorp to be an offset in that zone
|
|
*/
|
|
static struct strip_zone *find_zone(struct r0conf *conf,
|
|
sector_t *sectorp)
|
|
{
|
|
int i;
|
|
struct strip_zone *z = conf->strip_zone;
|
|
sector_t sector = *sectorp;
|
|
|
|
for (i = 0; i < conf->nr_strip_zones; i++)
|
|
if (sector < z[i].zone_end) {
|
|
if (i)
|
|
*sectorp = sector - z[i-1].zone_end;
|
|
return z + i;
|
|
}
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* remaps the bio to the target device. we separate two flows.
|
|
* power 2 flow and a general flow for the sake of perfromance
|
|
*/
|
|
static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
|
|
sector_t sector, sector_t *sector_offset)
|
|
{
|
|
unsigned int sect_in_chunk;
|
|
sector_t chunk;
|
|
struct r0conf *conf = mddev->private;
|
|
int raid_disks = conf->strip_zone[0].nb_dev;
|
|
unsigned int chunk_sects = mddev->chunk_sectors;
|
|
|
|
if (is_power_of_2(chunk_sects)) {
|
|
int chunksect_bits = ffz(~chunk_sects);
|
|
/* find the sector offset inside the chunk */
|
|
sect_in_chunk = sector & (chunk_sects - 1);
|
|
sector >>= chunksect_bits;
|
|
/* chunk in zone */
|
|
chunk = *sector_offset;
|
|
/* quotient is the chunk in real device*/
|
|
sector_div(chunk, zone->nb_dev << chunksect_bits);
|
|
} else{
|
|
sect_in_chunk = sector_div(sector, chunk_sects);
|
|
chunk = *sector_offset;
|
|
sector_div(chunk, chunk_sects * zone->nb_dev);
|
|
}
|
|
/*
|
|
* position the bio over the real device
|
|
* real sector = chunk in device + starting of zone
|
|
* + the position in the chunk
|
|
*/
|
|
*sector_offset = (chunk * chunk_sects) + sect_in_chunk;
|
|
return conf->devlist[(zone - conf->strip_zone)*raid_disks
|
|
+ sector_div(sector, zone->nb_dev)];
|
|
}
|
|
|
|
/**
|
|
* raid0_mergeable_bvec -- tell bio layer if two requests can be merged
|
|
* @q: request queue
|
|
* @bvm: properties of new bio
|
|
* @biovec: the request that could be merged to it.
|
|
*
|
|
* Return amount of bytes we can accept at this offset
|
|
*/
|
|
static int raid0_mergeable_bvec(struct request_queue *q,
|
|
struct bvec_merge_data *bvm,
|
|
struct bio_vec *biovec)
|
|
{
|
|
struct mddev *mddev = q->queuedata;
|
|
struct r0conf *conf = mddev->private;
|
|
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
|
|
sector_t sector_offset = sector;
|
|
int max;
|
|
unsigned int chunk_sectors = mddev->chunk_sectors;
|
|
unsigned int bio_sectors = bvm->bi_size >> 9;
|
|
struct strip_zone *zone;
|
|
struct md_rdev *rdev;
|
|
struct request_queue *subq;
|
|
|
|
if (is_power_of_2(chunk_sectors))
|
|
max = (chunk_sectors - ((sector & (chunk_sectors-1))
|
|
+ bio_sectors)) << 9;
|
|
else
|
|
max = (chunk_sectors - (sector_div(sector, chunk_sectors)
|
|
+ bio_sectors)) << 9;
|
|
if (max < 0)
|
|
max = 0; /* bio_add cannot handle a negative return */
|
|
if (max <= biovec->bv_len && bio_sectors == 0)
|
|
return biovec->bv_len;
|
|
if (max < biovec->bv_len)
|
|
/* too small already, no need to check further */
|
|
return max;
|
|
if (!conf->has_merge_bvec)
|
|
return max;
|
|
|
|
/* May need to check subordinate device */
|
|
sector = sector_offset;
|
|
zone = find_zone(mddev->private, §or_offset);
|
|
rdev = map_sector(mddev, zone, sector, §or_offset);
|
|
subq = bdev_get_queue(rdev->bdev);
|
|
if (subq->merge_bvec_fn) {
|
|
bvm->bi_bdev = rdev->bdev;
|
|
bvm->bi_sector = sector_offset + zone->dev_start +
|
|
rdev->data_offset;
|
|
return min(max, subq->merge_bvec_fn(subq, bvm, biovec));
|
|
} else
|
|
return max;
|
|
}
|
|
|
|
static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks)
|
|
{
|
|
sector_t array_sectors = 0;
|
|
struct md_rdev *rdev;
|
|
|
|
WARN_ONCE(sectors || raid_disks,
|
|
"%s does not support generic reshape\n", __func__);
|
|
|
|
rdev_for_each(rdev, mddev)
|
|
array_sectors += rdev->sectors;
|
|
|
|
return array_sectors;
|
|
}
|
|
|
|
static int raid0_stop(struct mddev *mddev);
|
|
|
|
static int raid0_run(struct mddev *mddev)
|
|
{
|
|
struct r0conf *conf;
|
|
int ret;
|
|
|
|
if (mddev->chunk_sectors == 0) {
|
|
printk(KERN_ERR "md/raid0:%s: chunk size must be set.\n",
|
|
mdname(mddev));
|
|
return -EINVAL;
|
|
}
|
|
if (md_check_no_bitmap(mddev))
|
|
return -EINVAL;
|
|
blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
|
|
blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
|
|
blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
|
|
|
|
/* if private is not null, we are here after takeover */
|
|
if (mddev->private == NULL) {
|
|
ret = create_strip_zones(mddev, &conf);
|
|
if (ret < 0)
|
|
return ret;
|
|
mddev->private = conf;
|
|
}
|
|
conf = mddev->private;
|
|
|
|
/* calculate array device size */
|
|
md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
|
|
|
|
printk(KERN_INFO "md/raid0:%s: md_size is %llu sectors.\n",
|
|
mdname(mddev),
|
|
(unsigned long long)mddev->array_sectors);
|
|
/* calculate the max read-ahead size.
|
|
* For read-ahead of large files to be effective, we need to
|
|
* readahead at least twice a whole stripe. i.e. number of devices
|
|
* multiplied by chunk size times 2.
|
|
* If an individual device has an ra_pages greater than the
|
|
* chunk size, then we will not drive that device as hard as it
|
|
* wants. We consider this a configuration error: a larger
|
|
* chunksize should be used in that case.
|
|
*/
|
|
{
|
|
int stripe = mddev->raid_disks *
|
|
(mddev->chunk_sectors << 9) / PAGE_SIZE;
|
|
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
|
|
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
|
|
}
|
|
|
|
blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec);
|
|
dump_zones(mddev);
|
|
|
|
ret = md_integrity_register(mddev);
|
|
if (ret)
|
|
raid0_stop(mddev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int raid0_stop(struct mddev *mddev)
|
|
{
|
|
struct r0conf *conf = mddev->private;
|
|
|
|
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
|
|
kfree(conf->strip_zone);
|
|
kfree(conf->devlist);
|
|
kfree(conf);
|
|
mddev->private = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Is io distribute over 1 or more chunks ?
|
|
*/
|
|
static inline int is_io_in_chunk_boundary(struct mddev *mddev,
|
|
unsigned int chunk_sects, struct bio *bio)
|
|
{
|
|
if (likely(is_power_of_2(chunk_sects))) {
|
|
return chunk_sects >= ((bio->bi_sector & (chunk_sects-1))
|
|
+ (bio->bi_size >> 9));
|
|
} else{
|
|
sector_t sector = bio->bi_sector;
|
|
return chunk_sects >= (sector_div(sector, chunk_sects)
|
|
+ (bio->bi_size >> 9));
|
|
}
|
|
}
|
|
|
|
static void raid0_make_request(struct mddev *mddev, struct bio *bio)
|
|
{
|
|
unsigned int chunk_sects;
|
|
sector_t sector_offset;
|
|
struct strip_zone *zone;
|
|
struct md_rdev *tmp_dev;
|
|
|
|
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
|
|
md_flush_request(mddev, bio);
|
|
return;
|
|
}
|
|
|
|
chunk_sects = mddev->chunk_sectors;
|
|
if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) {
|
|
sector_t sector = bio->bi_sector;
|
|
struct bio_pair *bp;
|
|
/* Sanity check -- queue functions should prevent this happening */
|
|
if ((bio->bi_vcnt != 1 && bio->bi_vcnt != 0) ||
|
|
bio->bi_idx != 0)
|
|
goto bad_map;
|
|
/* This is a one page bio that upper layers
|
|
* refuse to split for us, so we need to split it.
|
|
*/
|
|
if (likely(is_power_of_2(chunk_sects)))
|
|
bp = bio_split(bio, chunk_sects - (sector &
|
|
(chunk_sects-1)));
|
|
else
|
|
bp = bio_split(bio, chunk_sects -
|
|
sector_div(sector, chunk_sects));
|
|
raid0_make_request(mddev, &bp->bio1);
|
|
raid0_make_request(mddev, &bp->bio2);
|
|
bio_pair_release(bp);
|
|
return;
|
|
}
|
|
|
|
sector_offset = bio->bi_sector;
|
|
zone = find_zone(mddev->private, §or_offset);
|
|
tmp_dev = map_sector(mddev, zone, bio->bi_sector,
|
|
§or_offset);
|
|
bio->bi_bdev = tmp_dev->bdev;
|
|
bio->bi_sector = sector_offset + zone->dev_start +
|
|
tmp_dev->data_offset;
|
|
|
|
if (unlikely((bio->bi_rw & REQ_DISCARD) &&
|
|
!blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) {
|
|
/* Just ignore it */
|
|
bio_endio(bio, 0);
|
|
return;
|
|
}
|
|
|
|
generic_make_request(bio);
|
|
return;
|
|
|
|
bad_map:
|
|
printk("md/raid0:%s: make_request bug: can't convert block across chunks"
|
|
" or bigger than %dk %llu %d\n",
|
|
mdname(mddev), chunk_sects / 2,
|
|
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
|
|
|
|
bio_io_error(bio);
|
|
return;
|
|
}
|
|
|
|
static void raid0_status(struct seq_file *seq, struct mddev *mddev)
|
|
{
|
|
seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2);
|
|
return;
|
|
}
|
|
|
|
static void *raid0_takeover_raid45(struct mddev *mddev)
|
|
{
|
|
struct md_rdev *rdev;
|
|
struct r0conf *priv_conf;
|
|
|
|
if (mddev->degraded != 1) {
|
|
printk(KERN_ERR "md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n",
|
|
mdname(mddev),
|
|
mddev->degraded);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
rdev_for_each(rdev, mddev) {
|
|
/* check slot number for a disk */
|
|
if (rdev->raid_disk == mddev->raid_disks-1) {
|
|
printk(KERN_ERR "md/raid0:%s: raid5 must have missing parity disk!\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
|
|
/* Set new parameters */
|
|
mddev->new_level = 0;
|
|
mddev->new_layout = 0;
|
|
mddev->new_chunk_sectors = mddev->chunk_sectors;
|
|
mddev->raid_disks--;
|
|
mddev->delta_disks = -1;
|
|
/* make sure it will be not marked as dirty */
|
|
mddev->recovery_cp = MaxSector;
|
|
|
|
create_strip_zones(mddev, &priv_conf);
|
|
return priv_conf;
|
|
}
|
|
|
|
static void *raid0_takeover_raid10(struct mddev *mddev)
|
|
{
|
|
struct r0conf *priv_conf;
|
|
|
|
/* Check layout:
|
|
* - far_copies must be 1
|
|
* - near_copies must be 2
|
|
* - disks number must be even
|
|
* - all mirrors must be already degraded
|
|
*/
|
|
if (mddev->layout != ((1 << 8) + 2)) {
|
|
printk(KERN_ERR "md/raid0:%s:: Raid0 cannot takover layout: 0x%x\n",
|
|
mdname(mddev),
|
|
mddev->layout);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (mddev->raid_disks & 1) {
|
|
printk(KERN_ERR "md/raid0:%s: Raid0 cannot takover Raid10 with odd disk number.\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (mddev->degraded != (mddev->raid_disks>>1)) {
|
|
printk(KERN_ERR "md/raid0:%s: All mirrors must be already degraded!\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/* Set new parameters */
|
|
mddev->new_level = 0;
|
|
mddev->new_layout = 0;
|
|
mddev->new_chunk_sectors = mddev->chunk_sectors;
|
|
mddev->delta_disks = - mddev->raid_disks / 2;
|
|
mddev->raid_disks += mddev->delta_disks;
|
|
mddev->degraded = 0;
|
|
/* make sure it will be not marked as dirty */
|
|
mddev->recovery_cp = MaxSector;
|
|
|
|
create_strip_zones(mddev, &priv_conf);
|
|
return priv_conf;
|
|
}
|
|
|
|
static void *raid0_takeover_raid1(struct mddev *mddev)
|
|
{
|
|
struct r0conf *priv_conf;
|
|
int chunksect;
|
|
|
|
/* Check layout:
|
|
* - (N - 1) mirror drives must be already faulty
|
|
*/
|
|
if ((mddev->raid_disks - 1) != mddev->degraded) {
|
|
printk(KERN_ERR "md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/*
|
|
* a raid1 doesn't have the notion of chunk size, so
|
|
* figure out the largest suitable size we can use.
|
|
*/
|
|
chunksect = 64 * 2; /* 64K by default */
|
|
|
|
/* The array must be an exact multiple of chunksize */
|
|
while (chunksect && (mddev->array_sectors & (chunksect - 1)))
|
|
chunksect >>= 1;
|
|
|
|
if ((chunksect << 9) < PAGE_SIZE)
|
|
/* array size does not allow a suitable chunk size */
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* Set new parameters */
|
|
mddev->new_level = 0;
|
|
mddev->new_layout = 0;
|
|
mddev->new_chunk_sectors = chunksect;
|
|
mddev->chunk_sectors = chunksect;
|
|
mddev->delta_disks = 1 - mddev->raid_disks;
|
|
mddev->raid_disks = 1;
|
|
/* make sure it will be not marked as dirty */
|
|
mddev->recovery_cp = MaxSector;
|
|
|
|
create_strip_zones(mddev, &priv_conf);
|
|
return priv_conf;
|
|
}
|
|
|
|
static void *raid0_takeover(struct mddev *mddev)
|
|
{
|
|
/* raid0 can take over:
|
|
* raid4 - if all data disks are active.
|
|
* raid5 - providing it is Raid4 layout and one disk is faulty
|
|
* raid10 - assuming we have all necessary active disks
|
|
* raid1 - with (N -1) mirror drives faulty
|
|
*/
|
|
if (mddev->level == 4)
|
|
return raid0_takeover_raid45(mddev);
|
|
|
|
if (mddev->level == 5) {
|
|
if (mddev->layout == ALGORITHM_PARITY_N)
|
|
return raid0_takeover_raid45(mddev);
|
|
|
|
printk(KERN_ERR "md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",
|
|
mdname(mddev), ALGORITHM_PARITY_N);
|
|
}
|
|
|
|
if (mddev->level == 10)
|
|
return raid0_takeover_raid10(mddev);
|
|
|
|
if (mddev->level == 1)
|
|
return raid0_takeover_raid1(mddev);
|
|
|
|
printk(KERN_ERR "Takeover from raid%i to raid0 not supported\n",
|
|
mddev->level);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void raid0_quiesce(struct mddev *mddev, int state)
|
|
{
|
|
}
|
|
|
|
static struct md_personality raid0_personality=
|
|
{
|
|
.name = "raid0",
|
|
.level = 0,
|
|
.owner = THIS_MODULE,
|
|
.make_request = raid0_make_request,
|
|
.run = raid0_run,
|
|
.stop = raid0_stop,
|
|
.status = raid0_status,
|
|
.size = raid0_size,
|
|
.takeover = raid0_takeover,
|
|
.quiesce = raid0_quiesce,
|
|
};
|
|
|
|
static int __init raid0_init (void)
|
|
{
|
|
return register_md_personality (&raid0_personality);
|
|
}
|
|
|
|
static void raid0_exit (void)
|
|
{
|
|
unregister_md_personality (&raid0_personality);
|
|
}
|
|
|
|
module_init(raid0_init);
|
|
module_exit(raid0_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("RAID0 (striping) personality for MD");
|
|
MODULE_ALIAS("md-personality-2"); /* RAID0 */
|
|
MODULE_ALIAS("md-raid0");
|
|
MODULE_ALIAS("md-level-0");
|