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Just one fix for md in 3.8

Browse source 
dmraid assess redundancy and replacements slightly inaccurately which
 could lead to some degraded arrays failing to assemble.
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Merge tag 'md-3.8-fixes' of git://neil.brown.name/md

Pull dmraid fix from NeilBrown:
 "Just one fix for md in 3.8

  dmraid assess redundancy and replacements slightly inaccurately which
  could lead to some degraded arrays failing to assemble."

* tag 'md-3.8-fixes' of git://neil.brown.name/md:
  DM-RAID: Fix RAID10's check for sufficient redundancy
This commit is contained in:
Linus Torvalds 2013-01-28 15:15:34 -08:00
commit f94d4fe0b5
2 changed files with 38 additions and 64 deletions
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1
Documentation/device-mapper/dm-raid.txt
View file

@ -141,3 +141,4 @@ Version History
1.2.0 Handle creation of arrays that contain failed devices.
1.3.0 Added support for RAID 10
1.3.1 Allow device replacement/rebuild for RAID 10
1.3.2 Fix/improve redundancy checking for RAID10

101
drivers/md/dm-raid.c
View file

@ -340,24 +340,22 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
}
/*
* validate_rebuild_devices
* validate_raid_redundancy
* @rs
*
* Determine if the devices specified for rebuild can result in a valid
* usable array that is capable of rebuilding the given devices.
* Determine if there are enough devices in the array that haven't
* failed (or are being rebuilt) to form a usable array.
*
* Returns: 0 on success, -EINVAL on failure.
*/
static int validate_rebuild_devices(struct raid_set *rs)
static int validate_raid_redundancy(struct raid_set *rs)
{
unsigned i, rebuild_cnt = 0;
unsigned rebuilds_per_group, copies, d;
if (!(rs->print_flags & DMPF_REBUILD))
return 0;
for (i = 0; i < rs->md.raid_disks; i++)
if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
!rs->dev[i].rdev.sb_page)
rebuild_cnt++;
switch (rs->raid_type->level) {
@ -393,27 +391,24 @@ static int validate_rebuild_devices(struct raid_set *rs)
* A A B B C
* C D D E E
*/
rebuilds_per_group = 0;
for (i = 0; i < rs->md.raid_disks * copies; i++) {
if (!(i % copies))
rebuilds_per_group = 0;
d = i % rs->md.raid_disks;
if (!test_bit(In_sync, &rs->dev[d].rdev.flags) &&
if ((!rs->dev[d].rdev.sb_page ||
!test_bit(In_sync, &rs->dev[d].rdev.flags)) &&
(++rebuilds_per_group >= copies))
goto too_many;
if (!((i + 1) % copies))
rebuilds_per_group = 0;
}
break;
default:
DMERR("The rebuild parameter is not supported for %s",
rs->raid_type->name);
rs->ti->error = "Rebuild not supported for this RAID type";
return -EINVAL;
if (rebuild_cnt)
return -EINVAL;
}
return 0;
too_many:
rs->ti->error = "Too many rebuild devices specified";
return -EINVAL;
}
@ -664,9 +659,6 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
}
rs->md.dev_sectors = sectors_per_dev;
if (validate_rebuild_devices(rs))
return -EINVAL;
/* Assume there are no metadata devices until the drives are parsed */
rs->md.persistent = 0;
rs->md.external = 1;
@ -995,28 +987,10 @@ static int super_validate(struct mddev *mddev, struct md_rdev *rdev)
static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
{
int ret;
unsigned redundancy = 0;
struct raid_dev *dev;
struct md_rdev *rdev, *tmp, *freshest;
struct mddev *mddev = &rs->md;
switch (rs->raid_type->level) {
case 1:
redundancy = rs->md.raid_disks - 1;
break;
case 4:
case 5:
case 6:
redundancy = rs->raid_type->parity_devs;
break;
case 10:
redundancy = raid10_md_layout_to_copies(mddev->layout) - 1;
break;
default:
ti->error = "Unknown RAID type";
return -EINVAL;
}
freshest = NULL;
rdev_for_each_safe(rdev, tmp, mddev) {
/*
@ -1045,44 +1019,43 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
break;
default:
dev = container_of(rdev, struct raid_dev, rdev);
if (redundancy--) {
if (dev->meta_dev)
dm_put_device(ti, dev->meta_dev);
if (dev->meta_dev)
dm_put_device(ti, dev->meta_dev);
dev->meta_dev = NULL;
rdev->meta_bdev = NULL;
dev->meta_dev = NULL;
rdev->meta_bdev = NULL;
if (rdev->sb_page)
put_page(rdev->sb_page);
if (rdev->sb_page)
put_page(rdev->sb_page);
rdev->sb_page = NULL;
rdev->sb_page = NULL;
rdev->sb_loaded = 0;
rdev->sb_loaded = 0;
/*
* We might be able to salvage the data device
* even though the meta device has failed. For
* now, we behave as though '- -' had been
* set for this device in the table.
*/
if (dev->data_dev)
dm_put_device(ti, dev->data_dev);
/*
* We might be able to salvage the data device
* even though the meta device has failed. For
* now, we behave as though '- -' had been
* set for this device in the table.
*/
if (dev->data_dev)
dm_put_device(ti, dev->data_dev);
dev->data_dev = NULL;
rdev->bdev = NULL;
dev->data_dev = NULL;
rdev->bdev = NULL;
list_del(&rdev->same_set);
continue;
}
ti->error = "Failed to load superblock";
return ret;
list_del(&rdev->same_set);
}
}
if (!freshest)
return 0;
if (validate_raid_redundancy(rs)) {
rs->ti->error = "Insufficient redundancy to activate array";
return -EINVAL;
}
/*
* Validation of the freshest device provides the source of
* validation for the remaining devices.
@ -1432,7 +1405,7 @@ static void raid_resume(struct dm_target *ti)
static struct target_type raid_target = {
.name = "raid",
.version = {1, 4, 0},
.version = {1, 4, 1},
.module = THIS_MODULE,
.ctr = raid_ctr,
.dtr = raid_dtr,