[RFC ONLY 8/8] btrfs: add raid stripe tree pretty printer

Johannes Thumshirn
2022-05-16T14:32:05Z

Decode raid-stripe-tree entries on btrfs_print_tree().

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
fs/btrfs/print-tree.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index dd8777872143..1ee06b511951 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -6,6 +6,7 @@
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
+#include "raid-stripe-tree.h"

struct root_name_map {
u64 id;
@@ -25,6 +26,7 @@ static const struct root_name_map root_map[] = {
{ BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" },
{ BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" },
{ BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" },
+ { BTRFS_RAID_STRIPE_TREE_OBJECTID, "RAID_STRIPE_TREE" },
};

const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
@@ -184,6 +186,20 @@ static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
}
}

+static void print_raid_stripe_key(struct extent_buffer *eb, u32 item_size,
+ struct btrfs_dp_stripe *stripe)
+{
+ int num_stripes;
+ int i;
+
+ num_stripes = btrfs_num_raid_stripes(item_size);
+
+ for (i = 0; i < num_stripes; i++)
+ pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
+ btrfs_stripe_extent_devid_nr(eb, stripe, i),
+ btrfs_stripe_extent_offset_nr(eb, stripe, i));
+}
+
/*
* Helper to output refs and locking status of extent buffer. Useful to debug
* race condition related problems.
@@ -348,6 +364,11 @@ void btrfs_print_leaf(struct extent_buffer *l)
print_uuid_item(l, btrfs_item_ptr_offset(l, i),
btrfs_item_size(l, i));
break;
+ case BTRFS_RAID_STRIPE_KEY:
+ print_raid_stripe_key(l, btrfs_item_size(l, i),
+ btrfs_item_ptr(l, i,
+ struct btrfs_dp_stripe));
+ break;
}
}
}
--
2.35.1