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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 03-10-2009, 02:46 AM
"Martin K. Petersen"
 
Default dm: Data integrity support

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>

---

This patch requires a change in Jens' for-linus branch that adds a GFP
mask to bio_integrity_clone() and obsoletes the bio_set argument.


diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1046,6 +1046,19 @@ static int populate_table(struct dm_tabl
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;
@@ -1067,6 +1080,14 @@ static int table_load(struct dm_ioctl *p
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) {
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -877,6 +877,45 @@ struct dm_target *dm_table_find_target(s
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)
{
/*
@@ -897,6 +936,7 @@ void dm_table_set_restrictions(struct dm
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)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -703,6 +703,12 @@ static struct bio *split_bvec(struct bio
clone->bi_io_vec->bv_len = clone->bi_size;
clone->bi_flags |= 1 << BIO_CLONED;

+ if (bio_integrity(bio)) {
+ bio_integrity_clone(clone, bio, GFP_NOIO);
+ bio_integrity_trim(clone,
+ bio_sector_offset(bio, idx, offset), len);
+ }
+
return clone;
}

@@ -724,6 +730,14 @@ static struct bio *clone_bio(struct bio
clone->bi_size = to_bytes(len);
clone->bi_flags &= ~(1 << BIO_SEG_VALID);

+ if (bio_integrity(bio)) {
+ bio_integrity_clone(clone, bio, GFP_NOIO);
+
+ if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
+ bio_integrity_trim(clone,
+ bio_sector_offset(bio, idx, 0), len);
+ }
+
return clone;
}

@@ -1191,6 +1205,7 @@ static void free_dev(struct mapped_devic
mempool_destroy(md->tio_pool);
mempool_destroy(md->io_pool);
bioset_free(md->bs);
+ blk_integrity_unregister(md->disk);
del_gendisk(md->disk);
free_minor(minor);


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