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dm: add integrity support

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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
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21
drivers/md/dm-ioctl.c
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@@ -1047,6 +1047,19 @@ static int populate_table(struct dm_table *table,
return dm_table_complete(table);
}
static int table_prealloc_integrity(struct dm_table *t,
struct mapped_device *md)
{
struct list_head *devices = dm_table_get_devices(t);
struct dm_dev_internal *dd;
list_for_each_entry(dd, devices, list)
if (bdev_get_integrity(dd->dm_dev.bdev))
return blk_integrity_register(dm_disk(md), NULL);
return 0;
}
static int table_load(struct dm_ioctl *param, size_t param_size)
{
int r;
@@ -1068,6 +1081,14 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
goto out;
}
r = table_prealloc_integrity(t, md);
if (r) {
DMERR("%s: could not register integrity profile.",
dm_device_name(md));
dm_table_destroy(t);
goto out;
}
down_write(&_hash_lock);
hc = dm_get_mdptr(md);
if (!hc || hc->md != md) {