Support printing these things.
Signed-off-by: Stefan Behrens <sbehr...@giantdisaster.de>
---
ctree.h | 29 +++++++++++++++++++
print-tree.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 121 insertions(+), 3 deletions(-)
diff --git a/ctree.h b/ctree.h
index 4ea37ac..0f14b41 100644
--- a/ctree.h
+++ b/ctree.h
@@ -71,6 +71,8 @@ struct btrfs_free_space_ctl;
#define BTRFS_CSUM_TREE_OBJECTID 7ULL
#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
+/* for storing items that use the BTRFS_UUID_KEY */
+#define BTRFS_UUID_TREE_OBJECTID 9ULL
/* for storing balance parameters in the root tree */
#define BTRFS_BALANCE_OBJECTID -4ULL
@@ -811,6 +813,16 @@ struct btrfs_csum_item {
u8 csum;
} __attribute__ ((__packed__));
+/* for items that use the BTRFS_UUID_KEY */
+#define BTRFS_UUID_ITEM_TYPE_SUBVOL 0 /* for UUIDs assigned to subvols */
+#define BTRFS_UUID_ITEM_TYPE_RECEIVED_SUBVOL 1 /* for UUIDs assigned to
+ * received subvols */
+struct btrfs_uuid_item {
+ __le16 type; /* refer to BTRFS_UUID_ITEM_TYPE* defines above */
+ __le32 len; /* number of following 64bit values */
+ __le64 data[0]; /* data aligned to 64bit */
+} __attribute__ ((__packed__));
+
/* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
@@ -1107,6 +1119,17 @@ struct btrfs_root {
#define BTRFS_DEV_REPLACE_KEY 250
/*
+ * Stores items that allow to quickly map UUIDs to something else.
+ * These items are part of the filesystem UUID tree.
+ * The key is built like this:
+ * (UUID_upper_64_bits, BTRFS_UUID_KEY, UUID_lower_64_bits).
+ */
+#if BTRFS_UUID_SIZE != 16
+#error "UUID items require BTRFS_UUID_SIZE == 16!"
+#endif
+#define BTRFS_UUID_KEY 251
+
+/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
@@ -2046,6 +2069,12 @@ static inline u32
btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
return btrfs_item_size(eb, e) - offset;
}
+/* btrfs_uuid_item */
+BTRFS_SETGET_FUNCS(uuid_type, struct btrfs_uuid_item, type, 16);
+BTRFS_SETGET_FUNCS(uuid_len, struct btrfs_uuid_item, len, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_uuid_type, struct btrfs_uuid_item, type, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_uuid_len, struct btrfs_uuid_item, len, 32);
+
static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
if (level == 0)
return root->leafsize;
diff --git a/print-tree.c b/print-tree.c
index aae47a9..c49a189 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -509,6 +509,9 @@ static void print_key_type(u64 objectid, u8 type)
case BTRFS_DEV_STATS_KEY:
printf("DEV_STATS_ITEM");
break;
+ case BTRFS_UUID_KEY:
+ printf("BTRFS_UUID_KEY");
+ break;
default:
printf("UNKNOWN.%d", type);
};
@@ -516,15 +519,17 @@ static void print_key_type(u64 objectid, u8 type)
static void print_objectid(u64 objectid, u8 type)
{
- if (type == BTRFS_DEV_EXTENT_KEY) {
+ switch (type) {
+ case BTRFS_DEV_EXTENT_KEY:
printf("%llu", (unsigned long long)objectid); /* device id */
return;
- }
- switch (type) {
case BTRFS_QGROUP_RELATION_KEY:
printf("%llu/%llu", objectid >> 48,
objectid & ((1ll << 48) - 1));
return;
+ case BTRFS_UUID_KEY:
+ printf("0x%016llx", (unsigned long long)objectid);
+ return;
}
switch (objectid) {
@@ -582,6 +587,9 @@ static void print_objectid(u64 objectid, u8 type)
case BTRFS_QUOTA_TREE_OBJECTID:
printf("QUOTA_TREE");
break;
+ case BTRFS_UUID_TREE_OBJECTID:
+ printf("UUID_TREE");
+ break;
case BTRFS_MULTIPLE_OBJECTIDS:
printf("MULTIPLE");
break;
@@ -616,6 +624,9 @@ void btrfs_print_key(struct btrfs_disk_key *disk_key)
printf(" %llu/%llu)", (unsigned long long)(offset >> 48),
(unsigned long long)(offset & ((1ll << 48) - 1)));
break;
+ case BTRFS_UUID_KEY:
+ printf(" 0x%016llx)", (unsigned long long)offset);
+ break;
default:
if (offset == (u64)-1)
printf(" -1)");
@@ -625,6 +636,78 @@ void btrfs_print_key(struct btrfs_disk_key *disk_key)
}
}
+static void print_uuid_item(struct extent_buffer *l,
+ struct btrfs_uuid_item *ptr,
+ u32 item_size)
+{
+ do {
+ u16 sub_item_type;
+ u64 sub_item_len;
+ u64 subvol_id;
+ unsigned long offset;
+
+ if (item_size < sizeof(*ptr)) {
+ printf("btrfs: uuid item too short (%lu < %d)!\n",
+ (unsigned long)item_size, (int)sizeof(*ptr));
+ return;
+ }
+ sub_item_type = btrfs_uuid_type(l, ptr);
+ sub_item_len = btrfs_uuid_len(l, ptr);
+ ptr++;
+ item_size -= sizeof(*ptr);
+ if (sub_item_len * sizeof(u64) > item_size) {
+ printf("btrfs: uuid item too short (%llu > %lu)!\n",
+ (unsigned long long)(sub_item_len * sizeof(u64)),
+ (unsigned long)item_size);
+
+ return;
+ }
+
+ offset = (unsigned long)ptr;
+ ptr = (struct btrfs_uuid_item *)
+ (((char *)ptr) + sub_item_len * sizeof(u64));
+ item_size -= sub_item_len * sizeof(u64);
+ switch (sub_item_type) {
+ case BTRFS_UUID_ITEM_TYPE_SUBVOL:
+ while (sub_item_len) {
+ read_extent_buffer(l, &subvol_id, offset,
+ sizeof(u64));
+ printf("\t\tsubvol_id %llu\n",
+ (unsigned long long)
+ le64_to_cpu(subvol_id));
+ sub_item_len--;
+ offset += sizeof(u64);
+ }
+ break;
+ case BTRFS_UUID_ITEM_TYPE_RECEIVED_SUBVOL:
+ while (sub_item_len) {
+ read_extent_buffer(l, &subvol_id, offset,
+ sizeof(u64));
+ printf("\t\treceived_subvol_id %llu\n",
+ (unsigned long long)
+ le64_to_cpu(subvol_id));
+ sub_item_len--;
+ offset += sizeof(u64);
+ }
+ break;
+ default:
+ printf("\t\tunknown type=%llu, len=8*%llu\n",
+ (unsigned long long)sub_item_type,
+ (unsigned long long)sub_item_len);
+ while (sub_item_len) {
+ read_extent_buffer(l, &subvol_id, offset,
+ sizeof(u64));
+ printf("\t\tid %llu\n",
+ (unsigned long long)
+ le64_to_cpu(subvol_id));
+ sub_item_len--;
+ offset += sizeof(u64);
+ }
+ break;
+ }
+ } while (item_size);
+}
+
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{
int i;
@@ -645,6 +728,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct
extent_buffer *l)
struct btrfs_qgroup_info_item *qg_info;
struct btrfs_qgroup_limit_item *qg_limit;
struct btrfs_qgroup_status_item *qg_status;
+ struct btrfs_uuid_item *uuid_item;
u32 nr = btrfs_header_nritems(l);
u64 objectid;
u32 type;
@@ -841,6 +925,11 @@ void btrfs_print_leaf(struct btrfs_root *root, struct
extent_buffer *l)
(long long)
btrfs_qgroup_limit_rsv_exclusive(l, qg_limit));
break;
+ case BTRFS_UUID_KEY:
+ uuid_item = btrfs_item_ptr(l, i,
+ struct btrfs_uuid_item);
+ print_uuid_item(l, uuid_item, btrfs_item_size_nr(l, i));
+ break;
case BTRFS_STRING_ITEM_KEY:
/* dirty, but it's simple */
str = l->data + btrfs_item_ptr_offset(l, i);
--
1.8.2.3
--
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