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authorMartin K. Petersen <martin.petersen@oracle.com>2009-04-08 19:27:12 -0400
committerAlasdair G Kergon <agk@redhat.com>2009-04-08 19:27:12 -0400
commit9c47008d13add50ec4597a8b9eee200c515282c8 (patch)
treedebd8ebb2fef2687d4548a177505ec30bda95503 /drivers/md/dm-table.c
parent577c9c456f0e1371cbade38eaf91ae8e8a308555 (diff)
dm: add 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> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-table.c')
-rw-r--r--drivers/md/dm-table.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index e8361b191b9b..02d0b489fad6 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -879,6 +879,45 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
879 return &t->targets[(KEYS_PER_NODE * n) + k]; 879 return &t->targets[(KEYS_PER_NODE * n) + k];
880} 880}
881 881
882/*
883 * Set the integrity profile for this device if all devices used have
884 * matching profiles.
885 */
886static void dm_table_set_integrity(struct dm_table *t)
887{
888 struct list_head *devices = dm_table_get_devices(t);
889 struct dm_dev_internal *prev = NULL, *dd = NULL;
890
891 if (!blk_get_integrity(dm_disk(t->md)))
892 return;
893
894 list_for_each_entry(dd, devices, list) {
895 if (prev &&
896 blk_integrity_compare(prev->dm_dev.bdev->bd_disk,
897 dd->dm_dev.bdev->bd_disk) < 0) {
898 DMWARN("%s: integrity not set: %s and %s mismatch",
899 dm_device_name(t->md),
900 prev->dm_dev.bdev->bd_disk->disk_name,
901 dd->dm_dev.bdev->bd_disk->disk_name);
902 goto no_integrity;
903 }
904 prev = dd;
905 }
906
907 if (!prev || !bdev_get_integrity(prev->dm_dev.bdev))
908 goto no_integrity;
909
910 blk_integrity_register(dm_disk(t->md),
911 bdev_get_integrity(prev->dm_dev.bdev));
912
913 return;
914
915no_integrity:
916 blk_integrity_register(dm_disk(t->md), NULL);
917
918 return;
919}
920
882void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q) 921void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
883{ 922{
884 /* 923 /*
@@ -899,6 +938,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
899 else 938 else
900 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, q); 939 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, q);
901 940
941 dm_table_set_integrity(t);
902} 942}
903 943
904unsigned int dm_table_get_num_targets(struct dm_table *t) 944unsigned int dm_table_get_num_targets(struct dm_table *t)