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dm raid: add md raid1 support

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Support the MD RAID1 personality through dm-raid.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow 2011-08-02 12:32:07 +01:00 committed by Alasdair G Kergon
parent b12d437b73
commit 327372797c
1 changed files with 39 additions and 10 deletions
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49
drivers/md/dm-raid.c
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@ -8,6 +8,7 @@
#include <linux/slab.h>
#include "md.h"
#include "raid1.h"
#include "raid5.h"
#include "bitmap.h"
@ -72,6 +73,7 @@ static struct raid_type {
const unsigned level; /* RAID level. */
const unsigned algorithm; /* RAID algorithm. */
} raid_types[] = {
{"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */},
{"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0},
{"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
{"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
@ -105,7 +107,8 @@ static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *ra
}
sectors_per_dev = ti->len;
if (sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
if ((raid_type->level > 1) &&
sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
ti->error = "Target length not divisible by number of data devices";
return ERR_PTR(-EINVAL);
}
@ -329,13 +332,16 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
/*
* Possible arguments are...
* RAID456:
* <chunk_size> [optional_args]
*
* Optional args:
* [[no]sync] Force or prevent recovery of the entire array
* Argument definitions
* <chunk_size> The number of sectors per disk that
* will form the "stripe"
* [[no]sync] Force or prevent recovery of the
* entire array
* [rebuild <idx>] Rebuild the drive indicated by the index
* [daemon_sleep <ms>] Time between bitmap daemon work to clear bits
* [daemon_sleep <ms>] Time between bitmap daemon work to
* clear bits
* [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
* [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
* [write_mostly <idx>] Indicate a write mostly drive via index
@ -352,11 +358,21 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
/*
* First, parse the in-order required arguments
* "chunk_size" is the only argument of this type.
*/
if ((strict_strtoul(argv[0], 10, &value) < 0) ||
!is_power_of_2(value) || (value < 8)) {
if ((strict_strtoul(argv[0], 10, &value) < 0)) {
rs->ti->error = "Bad chunk size";
return -EINVAL;
} else if (rs->raid_type->level == 1) {
if (value)
DMERR("Ignoring chunk size parameter for RAID 1");
value = 0;
} else if (!is_power_of_2(value)) {
rs->ti->error = "Chunk size must be a power of 2";
return -EINVAL;
} else if (value < 8) {
rs->ti->error = "Chunk size value is too small";
return -EINVAL;
}
rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
@ -413,8 +429,12 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
}
if (!strcasecmp(key, "rebuild")) {
if (++rebuild_cnt > rs->raid_type->parity_devs) {
rs->ti->error = "Too many rebuild drives given";
rebuild_cnt++;
if (((rs->raid_type->level != 1) &&
(rebuild_cnt > rs->raid_type->parity_devs)) ||
((rs->raid_type->level == 1) &&
(rebuild_cnt > (rs->md.raid_disks - 1)))) {
rs->ti->error = "Too many rebuild devices specified for given RAID type";
return -EINVAL;
}
if (value > rs->md.raid_disks) {
@ -507,6 +527,11 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
else
rs->ti->split_io = region_size;
if (rs->md.chunk_sectors)
rs->ti->split_io = rs->md.chunk_sectors;
else
rs->ti->split_io = region_size;
/* Assume there are no metadata devices until the drives are parsed */
rs->md.persistent = 0;
rs->md.external = 1;
@ -525,6 +550,9 @@ static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
{
struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
if (rs->raid_type->level == 1)
return md_raid1_congested(&rs->md, bits);
return md_raid5_congested(&rs->md, bits);
}
@ -955,6 +983,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
rs->callbacks.congested_fn = raid_is_congested;
dm_table_add_target_callbacks(ti->table, &rs->callbacks);
mddev_suspend(&rs->md);
return 0;
bad:
@ -1147,7 +1176,7 @@ static void raid_resume(struct dm_target *ti)
static struct target_type raid_target = {
.name = "raid",
.version = {1, 0, 0},
.version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = raid_ctr,
.dtr = raid_dtr,