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![Mikulas Patocka](/assets/img/avatar_default.png)
Logical block size has type unsigned short. That means that it can be at most 32768. However, there are architectures that can run with 64k pages (for example arm64) and on these architectures, it may be possible to create block devices with 64k block size. For exmaple (run this on an architecture with 64k pages): Mount will fail with this error because it tries to read the superblock using 2-sector access: device-mapper: writecache: I/O is not aligned, sector 2, size 1024, block size 65536 EXT4-fs (dm-0): unable to read superblock This patch changes the logical block size from unsigned short to unsigned int to avoid the overflow. Cc: stable@vger.kernel.org Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
840 lines
22 KiB
C
840 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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raid0.c : Multiple Devices driver for Linux
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Copyright (C) 1994-96 Marc ZYNGIER
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<zyngier@ufr-info-p7.ibp.fr> or
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<maz@gloups.fdn.fr>
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Copyright (C) 1999, 2000 Ingo Molnar, Red Hat
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RAID-0 management functions.
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*/
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#include <linux/blkdev.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <trace/events/block.h>
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#include "md.h"
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#include "raid0.h"
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#include "raid5.h"
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static int default_layout = 0;
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module_param(default_layout, int, 0644);
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#define UNSUPPORTED_MDDEV_FLAGS \
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((1L << MD_HAS_JOURNAL) | \
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(1L << MD_JOURNAL_CLEAN) | \
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(1L << MD_FAILFAST_SUPPORTED) |\
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(1L << MD_HAS_PPL) | \
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(1L << MD_HAS_MULTIPLE_PPLS))
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static int raid0_congested(struct mddev *mddev, int bits)
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{
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struct r0conf *conf = mddev->private;
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struct md_rdev **devlist = conf->devlist;
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int raid_disks = conf->strip_zone[0].nb_dev;
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int i, ret = 0;
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for (i = 0; i < raid_disks && !ret ; i++) {
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struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
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ret |= bdi_congested(q->backing_dev_info, bits);
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}
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return ret;
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}
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/*
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* inform the user of the raid configuration
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*/
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static void dump_zones(struct mddev *mddev)
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{
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int j, k;
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sector_t zone_size = 0;
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sector_t zone_start = 0;
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char b[BDEVNAME_SIZE];
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struct r0conf *conf = mddev->private;
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int raid_disks = conf->strip_zone[0].nb_dev;
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pr_debug("md: RAID0 configuration for %s - %d zone%s\n",
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mdname(mddev),
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conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s");
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for (j = 0; j < conf->nr_strip_zones; j++) {
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char line[200];
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int len = 0;
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for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
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len += snprintf(line+len, 200-len, "%s%s", k?"/":"",
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bdevname(conf->devlist[j*raid_disks
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+ k]->bdev, b));
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pr_debug("md: zone%d=[%s]\n", j, line);
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zone_size = conf->strip_zone[j].zone_end - zone_start;
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pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n",
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(unsigned long long)zone_start>>1,
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(unsigned long long)conf->strip_zone[j].dev_start>>1,
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(unsigned long long)zone_size>>1);
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zone_start = conf->strip_zone[j].zone_end;
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}
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}
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static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
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{
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int i, c, err;
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sector_t curr_zone_end, sectors;
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struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev;
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struct strip_zone *zone;
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int cnt;
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char b[BDEVNAME_SIZE];
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char b2[BDEVNAME_SIZE];
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struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
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unsigned blksize = 512;
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*private_conf = ERR_PTR(-ENOMEM);
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if (!conf)
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return -ENOMEM;
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rdev_for_each(rdev1, mddev) {
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pr_debug("md/raid0:%s: looking at %s\n",
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mdname(mddev),
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bdevname(rdev1->bdev, b));
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c = 0;
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/* round size to chunk_size */
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sectors = rdev1->sectors;
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sector_div(sectors, mddev->chunk_sectors);
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rdev1->sectors = sectors * mddev->chunk_sectors;
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blksize = max(blksize, queue_logical_block_size(
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rdev1->bdev->bd_disk->queue));
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rdev_for_each(rdev2, mddev) {
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pr_debug("md/raid0:%s: comparing %s(%llu)"
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" with %s(%llu)\n",
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mdname(mddev),
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bdevname(rdev1->bdev,b),
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(unsigned long long)rdev1->sectors,
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bdevname(rdev2->bdev,b2),
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(unsigned long long)rdev2->sectors);
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if (rdev2 == rdev1) {
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pr_debug("md/raid0:%s: END\n",
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mdname(mddev));
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break;
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}
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if (rdev2->sectors == rdev1->sectors) {
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/*
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* Not unique, don't count it as a new
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* group
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*/
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pr_debug("md/raid0:%s: EQUAL\n",
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mdname(mddev));
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c = 1;
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break;
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}
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pr_debug("md/raid0:%s: NOT EQUAL\n",
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mdname(mddev));
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}
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if (!c) {
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pr_debug("md/raid0:%s: ==> UNIQUE\n",
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mdname(mddev));
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conf->nr_strip_zones++;
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pr_debug("md/raid0:%s: %d zones\n",
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mdname(mddev), conf->nr_strip_zones);
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}
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}
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pr_debug("md/raid0:%s: FINAL %d zones\n",
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mdname(mddev), conf->nr_strip_zones);
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if (conf->nr_strip_zones == 1) {
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conf->layout = RAID0_ORIG_LAYOUT;
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} else if (mddev->layout == RAID0_ORIG_LAYOUT ||
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mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) {
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conf->layout = mddev->layout;
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} else if (default_layout == RAID0_ORIG_LAYOUT ||
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default_layout == RAID0_ALT_MULTIZONE_LAYOUT) {
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conf->layout = default_layout;
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} else {
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pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n",
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mdname(mddev));
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pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n");
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err = -ENOTSUPP;
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goto abort;
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}
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/*
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* now since we have the hard sector sizes, we can make sure
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* chunk size is a multiple of that sector size
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*/
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if ((mddev->chunk_sectors << 9) % blksize) {
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pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n",
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mdname(mddev),
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mddev->chunk_sectors << 9, blksize);
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err = -EINVAL;
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goto abort;
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}
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err = -ENOMEM;
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conf->strip_zone = kcalloc(conf->nr_strip_zones,
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sizeof(struct strip_zone),
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GFP_KERNEL);
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if (!conf->strip_zone)
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goto abort;
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conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *),
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conf->nr_strip_zones,
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mddev->raid_disks),
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GFP_KERNEL);
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if (!conf->devlist)
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goto abort;
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/* The first zone must contain all devices, so here we check that
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* there is a proper alignment of slots to devices and find them all
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*/
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zone = &conf->strip_zone[0];
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cnt = 0;
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smallest = NULL;
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dev = conf->devlist;
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err = -EINVAL;
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rdev_for_each(rdev1, mddev) {
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int j = rdev1->raid_disk;
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if (mddev->level == 10) {
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/* taking over a raid10-n2 array */
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j /= 2;
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rdev1->new_raid_disk = j;
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}
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if (mddev->level == 1) {
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/* taiking over a raid1 array-
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* we have only one active disk
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*/
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j = 0;
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rdev1->new_raid_disk = j;
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}
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if (j < 0) {
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pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n",
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mdname(mddev));
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goto abort;
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}
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if (j >= mddev->raid_disks) {
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pr_warn("md/raid0:%s: bad disk number %d - aborting!\n",
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mdname(mddev), j);
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goto abort;
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}
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if (dev[j]) {
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pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n",
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mdname(mddev), j);
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goto abort;
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}
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dev[j] = rdev1;
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if (!smallest || (rdev1->sectors < smallest->sectors))
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smallest = rdev1;
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cnt++;
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}
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if (cnt != mddev->raid_disks) {
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pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n",
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mdname(mddev), cnt, mddev->raid_disks);
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goto abort;
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}
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zone->nb_dev = cnt;
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zone->zone_end = smallest->sectors * cnt;
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curr_zone_end = zone->zone_end;
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/* now do the other zones */
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for (i = 1; i < conf->nr_strip_zones; i++)
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{
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int j;
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zone = conf->strip_zone + i;
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dev = conf->devlist + i * mddev->raid_disks;
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pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i);
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zone->dev_start = smallest->sectors;
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smallest = NULL;
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c = 0;
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for (j=0; j<cnt; j++) {
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rdev = conf->devlist[j];
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if (rdev->sectors <= zone->dev_start) {
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pr_debug("md/raid0:%s: checking %s ... nope\n",
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mdname(mddev),
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bdevname(rdev->bdev, b));
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continue;
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}
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pr_debug("md/raid0:%s: checking %s ..."
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" contained as device %d\n",
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mdname(mddev),
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bdevname(rdev->bdev, b), c);
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dev[c] = rdev;
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c++;
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if (!smallest || rdev->sectors < smallest->sectors) {
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smallest = rdev;
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pr_debug("md/raid0:%s: (%llu) is smallest!.\n",
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mdname(mddev),
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(unsigned long long)rdev->sectors);
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}
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}
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zone->nb_dev = c;
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sectors = (smallest->sectors - zone->dev_start) * c;
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pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
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mdname(mddev),
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zone->nb_dev, (unsigned long long)sectors);
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curr_zone_end += sectors;
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zone->zone_end = curr_zone_end;
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pr_debug("md/raid0:%s: current zone start: %llu\n",
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mdname(mddev),
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(unsigned long long)smallest->sectors);
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}
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pr_debug("md/raid0:%s: done.\n", mdname(mddev));
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*private_conf = conf;
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return 0;
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abort:
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kfree(conf->strip_zone);
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kfree(conf->devlist);
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kfree(conf);
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*private_conf = ERR_PTR(err);
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return err;
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}
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/* Find the zone which holds a particular offset
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* Update *sectorp to be an offset in that zone
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*/
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static struct strip_zone *find_zone(struct r0conf *conf,
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sector_t *sectorp)
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{
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int i;
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struct strip_zone *z = conf->strip_zone;
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sector_t sector = *sectorp;
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for (i = 0; i < conf->nr_strip_zones; i++)
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if (sector < z[i].zone_end) {
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if (i)
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*sectorp = sector - z[i-1].zone_end;
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return z + i;
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}
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BUG();
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}
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/*
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* remaps the bio to the target device. we separate two flows.
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* power 2 flow and a general flow for the sake of performance
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*/
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static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
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sector_t sector, sector_t *sector_offset)
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{
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unsigned int sect_in_chunk;
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sector_t chunk;
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struct r0conf *conf = mddev->private;
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int raid_disks = conf->strip_zone[0].nb_dev;
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unsigned int chunk_sects = mddev->chunk_sectors;
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if (is_power_of_2(chunk_sects)) {
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int chunksect_bits = ffz(~chunk_sects);
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/* find the sector offset inside the chunk */
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sect_in_chunk = sector & (chunk_sects - 1);
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sector >>= chunksect_bits;
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/* chunk in zone */
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chunk = *sector_offset;
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/* quotient is the chunk in real device*/
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sector_div(chunk, zone->nb_dev << chunksect_bits);
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} else{
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sect_in_chunk = sector_div(sector, chunk_sects);
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chunk = *sector_offset;
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sector_div(chunk, chunk_sects * zone->nb_dev);
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}
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/*
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* position the bio over the real device
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* real sector = chunk in device + starting of zone
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* + the position in the chunk
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*/
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*sector_offset = (chunk * chunk_sects) + sect_in_chunk;
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return conf->devlist[(zone - conf->strip_zone)*raid_disks
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+ sector_div(sector, zone->nb_dev)];
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}
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static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks)
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{
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sector_t array_sectors = 0;
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struct md_rdev *rdev;
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WARN_ONCE(sectors || raid_disks,
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"%s does not support generic reshape\n", __func__);
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rdev_for_each(rdev, mddev)
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array_sectors += (rdev->sectors &
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~(sector_t)(mddev->chunk_sectors-1));
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return array_sectors;
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}
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static void raid0_free(struct mddev *mddev, void *priv);
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static int raid0_run(struct mddev *mddev)
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{
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struct r0conf *conf;
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int ret;
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if (mddev->chunk_sectors == 0) {
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pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev));
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return -EINVAL;
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}
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if (md_check_no_bitmap(mddev))
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return -EINVAL;
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/* if private is not null, we are here after takeover */
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if (mddev->private == NULL) {
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ret = create_strip_zones(mddev, &conf);
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if (ret < 0)
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return ret;
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mddev->private = conf;
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}
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conf = mddev->private;
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if (mddev->queue) {
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struct md_rdev *rdev;
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bool discard_supported = false;
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blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
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blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
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blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors);
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blk_queue_max_discard_sectors(mddev->queue, UINT_MAX);
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blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
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blk_queue_io_opt(mddev->queue,
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(mddev->chunk_sectors << 9) * mddev->raid_disks);
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rdev_for_each(rdev, mddev) {
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disk_stack_limits(mddev->gendisk, rdev->bdev,
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rdev->data_offset << 9);
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if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
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discard_supported = true;
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}
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if (!discard_supported)
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blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue);
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else
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blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
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}
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/* calculate array device size */
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md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
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pr_debug("md/raid0:%s: md_size is %llu sectors.\n",
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mdname(mddev),
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(unsigned long long)mddev->array_sectors);
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if (mddev->queue) {
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/* calculate the max read-ahead size.
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* For read-ahead of large files to be effective, we need to
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* readahead at least twice a whole stripe. i.e. number of devices
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* multiplied by chunk size times 2.
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* If an individual device has an ra_pages greater than the
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* chunk size, then we will not drive that device as hard as it
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* wants. We consider this a configuration error: a larger
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* chunksize should be used in that case.
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*/
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int stripe = mddev->raid_disks *
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(mddev->chunk_sectors << 9) / PAGE_SIZE;
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if (mddev->queue->backing_dev_info->ra_pages < 2* stripe)
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mddev->queue->backing_dev_info->ra_pages = 2* stripe;
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}
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dump_zones(mddev);
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ret = md_integrity_register(mddev);
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return ret;
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}
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static void raid0_free(struct mddev *mddev, void *priv)
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{
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struct r0conf *conf = priv;
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kfree(conf->strip_zone);
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kfree(conf->devlist);
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kfree(conf);
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}
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/*
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* Is io distribute over 1 or more chunks ?
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*/
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static inline int is_io_in_chunk_boundary(struct mddev *mddev,
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unsigned int chunk_sects, struct bio *bio)
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{
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if (likely(is_power_of_2(chunk_sects))) {
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return chunk_sects >=
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((bio->bi_iter.bi_sector & (chunk_sects-1))
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+ bio_sectors(bio));
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|
} else{
|
|
sector_t sector = bio->bi_iter.bi_sector;
|
|
return chunk_sects >= (sector_div(sector, chunk_sects)
|
|
+ bio_sectors(bio));
|
|
}
|
|
}
|
|
|
|
static void raid0_handle_discard(struct mddev *mddev, struct bio *bio)
|
|
{
|
|
struct r0conf *conf = mddev->private;
|
|
struct strip_zone *zone;
|
|
sector_t start = bio->bi_iter.bi_sector;
|
|
sector_t end;
|
|
unsigned int stripe_size;
|
|
sector_t first_stripe_index, last_stripe_index;
|
|
sector_t start_disk_offset;
|
|
unsigned int start_disk_index;
|
|
sector_t end_disk_offset;
|
|
unsigned int end_disk_index;
|
|
unsigned int disk;
|
|
|
|
zone = find_zone(conf, &start);
|
|
|
|
if (bio_end_sector(bio) > zone->zone_end) {
|
|
struct bio *split = bio_split(bio,
|
|
zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO,
|
|
&mddev->bio_set);
|
|
bio_chain(split, bio);
|
|
generic_make_request(bio);
|
|
bio = split;
|
|
end = zone->zone_end;
|
|
} else
|
|
end = bio_end_sector(bio);
|
|
|
|
if (zone != conf->strip_zone)
|
|
end = end - zone[-1].zone_end;
|
|
|
|
/* Now start and end is the offset in zone */
|
|
stripe_size = zone->nb_dev * mddev->chunk_sectors;
|
|
|
|
first_stripe_index = start;
|
|
sector_div(first_stripe_index, stripe_size);
|
|
last_stripe_index = end;
|
|
sector_div(last_stripe_index, stripe_size);
|
|
|
|
start_disk_index = (int)(start - first_stripe_index * stripe_size) /
|
|
mddev->chunk_sectors;
|
|
start_disk_offset = ((int)(start - first_stripe_index * stripe_size) %
|
|
mddev->chunk_sectors) +
|
|
first_stripe_index * mddev->chunk_sectors;
|
|
end_disk_index = (int)(end - last_stripe_index * stripe_size) /
|
|
mddev->chunk_sectors;
|
|
end_disk_offset = ((int)(end - last_stripe_index * stripe_size) %
|
|
mddev->chunk_sectors) +
|
|
last_stripe_index * mddev->chunk_sectors;
|
|
|
|
for (disk = 0; disk < zone->nb_dev; disk++) {
|
|
sector_t dev_start, dev_end;
|
|
struct bio *discard_bio = NULL;
|
|
struct md_rdev *rdev;
|
|
|
|
if (disk < start_disk_index)
|
|
dev_start = (first_stripe_index + 1) *
|
|
mddev->chunk_sectors;
|
|
else if (disk > start_disk_index)
|
|
dev_start = first_stripe_index * mddev->chunk_sectors;
|
|
else
|
|
dev_start = start_disk_offset;
|
|
|
|
if (disk < end_disk_index)
|
|
dev_end = (last_stripe_index + 1) * mddev->chunk_sectors;
|
|
else if (disk > end_disk_index)
|
|
dev_end = last_stripe_index * mddev->chunk_sectors;
|
|
else
|
|
dev_end = end_disk_offset;
|
|
|
|
if (dev_end <= dev_start)
|
|
continue;
|
|
|
|
rdev = conf->devlist[(zone - conf->strip_zone) *
|
|
conf->strip_zone[0].nb_dev + disk];
|
|
if (__blkdev_issue_discard(rdev->bdev,
|
|
dev_start + zone->dev_start + rdev->data_offset,
|
|
dev_end - dev_start, GFP_NOIO, 0, &discard_bio) ||
|
|
!discard_bio)
|
|
continue;
|
|
bio_chain(discard_bio, bio);
|
|
bio_clone_blkg_association(discard_bio, bio);
|
|
if (mddev->gendisk)
|
|
trace_block_bio_remap(bdev_get_queue(rdev->bdev),
|
|
discard_bio, disk_devt(mddev->gendisk),
|
|
bio->bi_iter.bi_sector);
|
|
generic_make_request(discard_bio);
|
|
}
|
|
bio_endio(bio);
|
|
}
|
|
|
|
static bool raid0_make_request(struct mddev *mddev, struct bio *bio)
|
|
{
|
|
struct r0conf *conf = mddev->private;
|
|
struct strip_zone *zone;
|
|
struct md_rdev *tmp_dev;
|
|
sector_t bio_sector;
|
|
sector_t sector;
|
|
sector_t orig_sector;
|
|
unsigned chunk_sects;
|
|
unsigned sectors;
|
|
|
|
if (unlikely(bio->bi_opf & REQ_PREFLUSH)
|
|
&& md_flush_request(mddev, bio))
|
|
return true;
|
|
|
|
if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) {
|
|
raid0_handle_discard(mddev, bio);
|
|
return true;
|
|
}
|
|
|
|
bio_sector = bio->bi_iter.bi_sector;
|
|
sector = bio_sector;
|
|
chunk_sects = mddev->chunk_sectors;
|
|
|
|
sectors = chunk_sects -
|
|
(likely(is_power_of_2(chunk_sects))
|
|
? (sector & (chunk_sects-1))
|
|
: sector_div(sector, chunk_sects));
|
|
|
|
/* Restore due to sector_div */
|
|
sector = bio_sector;
|
|
|
|
if (sectors < bio_sectors(bio)) {
|
|
struct bio *split = bio_split(bio, sectors, GFP_NOIO,
|
|
&mddev->bio_set);
|
|
bio_chain(split, bio);
|
|
generic_make_request(bio);
|
|
bio = split;
|
|
}
|
|
|
|
orig_sector = sector;
|
|
zone = find_zone(mddev->private, §or);
|
|
switch (conf->layout) {
|
|
case RAID0_ORIG_LAYOUT:
|
|
tmp_dev = map_sector(mddev, zone, orig_sector, §or);
|
|
break;
|
|
case RAID0_ALT_MULTIZONE_LAYOUT:
|
|
tmp_dev = map_sector(mddev, zone, sector, §or);
|
|
break;
|
|
default:
|
|
WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev));
|
|
bio_io_error(bio);
|
|
return true;
|
|
}
|
|
|
|
if (unlikely(is_mddev_broken(tmp_dev, "raid0"))) {
|
|
bio_io_error(bio);
|
|
return true;
|
|
}
|
|
|
|
bio_set_dev(bio, tmp_dev->bdev);
|
|
bio->bi_iter.bi_sector = sector + zone->dev_start +
|
|
tmp_dev->data_offset;
|
|
|
|
if (mddev->gendisk)
|
|
trace_block_bio_remap(bio->bi_disk->queue, bio,
|
|
disk_devt(mddev->gendisk), bio_sector);
|
|
mddev_check_writesame(mddev, bio);
|
|
mddev_check_write_zeroes(mddev, bio);
|
|
generic_make_request(bio);
|
|
return true;
|
|
}
|
|
|
|
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) {
|
|
pr_warn("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) {
|
|
pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
rdev->sectors = mddev->dev_sectors;
|
|
}
|
|
|
|
/* 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;
|
|
mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
|
|
|
|
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)) {
|
|
pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n",
|
|
mdname(mddev),
|
|
mddev->layout);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (mddev->raid_disks & 1) {
|
|
pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (mddev->degraded != (mddev->raid_disks>>1)) {
|
|
pr_warn("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;
|
|
mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
|
|
|
|
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) {
|
|
pr_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;
|
|
mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS);
|
|
|
|
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->bitmap) {
|
|
pr_warn("md/raid0: %s: cannot takeover array with bitmap\n",
|
|
mdname(mddev));
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
if (mddev->level == 4)
|
|
return raid0_takeover_raid45(mddev);
|
|
|
|
if (mddev->level == 5) {
|
|
if (mddev->layout == ALGORITHM_PARITY_N)
|
|
return raid0_takeover_raid45(mddev);
|
|
|
|
pr_warn("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);
|
|
|
|
pr_warn("Takeover from raid%i to raid0 not supported\n",
|
|
mddev->level);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static void raid0_quiesce(struct mddev *mddev, int quiesce)
|
|
{
|
|
}
|
|
|
|
static struct md_personality raid0_personality=
|
|
{
|
|
.name = "raid0",
|
|
.level = 0,
|
|
.owner = THIS_MODULE,
|
|
.make_request = raid0_make_request,
|
|
.run = raid0_run,
|
|
.free = raid0_free,
|
|
.status = raid0_status,
|
|
.size = raid0_size,
|
|
.takeover = raid0_takeover,
|
|
.quiesce = raid0_quiesce,
|
|
.congested = raid0_congested,
|
|
};
|
|
|
|
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");
|