Commit e0b4077f authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by David Sterba
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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: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b5e2c2ff

fs/btrfs/tree-checker.c

+42 −0
Original line number Diff line number Diff line
@@ -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)