lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

dm: add integrity support

Browse Source 
This patch provides support for data integrity passthrough in the device
mapper.

 - If one or more component devices support integrity an integrity
   profile is preallocated for the DM device.

 - If all component devices have compatible profiles the DM device is
   flagged as capable.

 - Handle integrity metadata when splitting and cloning bios.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Martin K. Petersen
2009-04-09 00:27:12 +01:00
committed by Alasdair G Kergon
parent 577c9c456f
commit 9c47008d13
3 changed files with 76 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/md/dm-table.c
View File

@@ -879,6 +879,45 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
return &t->targets[(KEYS_PER_NODE * n) + k];
}
/*
* Set the integrity profile for this device if all devices used have
* matching profiles.
*/
static void dm_table_set_integrity(struct dm_table *t)
{
struct list_head *devices = dm_table_get_devices(t);
struct dm_dev_internal *prev = NULL, *dd = NULL;
if (!blk_get_integrity(dm_disk(t->md)))
return;
list_for_each_entry(dd, devices, list) {
if (prev &&
blk_integrity_compare(prev->dm_dev.bdev->bd_disk,
dd->dm_dev.bdev->bd_disk) < 0) {
DMWARN("%s: integrity not set: %s and %s mismatch",
dm_device_name(t->md),
prev->dm_dev.bdev->bd_disk->disk_name,
dd->dm_dev.bdev->bd_disk->disk_name);
goto no_integrity;
}
prev = dd;
}
if (!prev || !bdev_get_integrity(prev->dm_dev.bdev))
goto no_integrity;
blk_integrity_register(dm_disk(t->md),
bdev_get_integrity(prev->dm_dev.bdev));
return;
no_integrity:
blk_integrity_register(dm_disk(t->md), NULL);
return;
}
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
{
/*
@@ -899,6 +938,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
else
queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, q);
dm_table_set_integrity(t);
}
unsigned int dm_table_get_num_targets(struct dm_table *t)