btrfs: tree-checker: add support for raid stripe tree

Add a tree checker support for RAID stripe tree items, verify:

- alignment
- presence of the incompat bit
- supported encoding

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 8ad92aa439248656c7b6fc9931cb63c4702f4817..1547090bf2c09117f0f5277a606e19a0080313c4 100644 (file)
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -30,6 +30,7 @@
 #include "file-item.h"
 #include "inode-item.h"
 #include "dir-item.h"
+#include "raid-stripe-tree.h"
 
 /*
  * Error message should follow the following format:
@@ -1632,6 +1633,44 @@ static int check_inode_ref(struct extent_buffer *leaf,
        return 0;
 }
 
+static int check_raid_stripe_extent(const struct extent_buffer *leaf,
+                                   const struct btrfs_key *key, int slot)
+{
+       struct btrfs_stripe_extent *stripe_extent =
+               btrfs_item_ptr(leaf, slot, struct btrfs_stripe_extent);
+
+       if (unlikely(!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize))) {
+               generic_err(leaf, slot,
+"invalid key objectid for raid stripe extent, have %llu expect aligned to %u",
+                           key->objectid, leaf->fs_info->sectorsize);
+               return -EUCLEAN;
+       }
+
+       if (unlikely(!btrfs_fs_incompat(leaf->fs_info, RAID_STRIPE_TREE))) {
+               generic_err(leaf, slot,
+       "RAID_STRIPE_EXTENT present but RAID_STRIPE_TREE incompat bit unset");
+               return -EUCLEAN;
+       }
+
+       switch (btrfs_stripe_extent_encoding(leaf, stripe_extent)) {
+       case BTRFS_STRIPE_RAID0:
+       case BTRFS_STRIPE_RAID1:
+       case BTRFS_STRIPE_DUP:
+       case BTRFS_STRIPE_RAID10:
+       case BTRFS_STRIPE_RAID5:
+       case BTRFS_STRIPE_RAID6:
+       case BTRFS_STRIPE_RAID1C3:
+       case BTRFS_STRIPE_RAID1C4:
+               break;
+       default:
+               generic_err(leaf, slot, "invalid raid stripe encoding %u",
+                           btrfs_stripe_extent_encoding(leaf, stripe_extent));
+               return -EUCLEAN;
+       }
+
+       return 0;
+}
+
 /*
  * Common point to switch the item-specific validation.
  */
@@ -1686,6 +1725,9 @@ static enum btrfs_tree_block_status check_leaf_item(struct extent_buffer *leaf,
        case BTRFS_EXTENT_DATA_REF_KEY:
                ret = check_extent_data_ref(leaf, key, slot);
                break;
+       case BTRFS_RAID_STRIPE_KEY:
+               ret = check_raid_stripe_extent(leaf, key, slot);
+               break;
        }
 
        if (ret)