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Btrfs-progs: Support UUID tree and UUID items in btrfs-debug-tree 

Support printing these things.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
master
Stefan Behrens 2013-06-26 17:17:55 +02:00 committed by David Sterba
parent a54a29a0cd
commit 64075c5be9
2 changed files with 58 additions and 3 deletions
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15
ctree.h
View File

@ -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
@ -1107,6 +1109,19 @@ 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_SUBVOL 251 /* for UUIDs assigned to subvols */
#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
* received subvols */
/*
* string items are for debugging. They just store a short string of
* data in the FS

46
print-tree.c
View File

@ -547,6 +547,12 @@ static void print_key_type(u64 objectid, u8 type)
case BTRFS_DEV_STATS_KEY:
printf("DEV_STATS_ITEM");
break;
case BTRFS_UUID_KEY_SUBVOL:
printf("BTRFS_UUID_KEY_SUBVOL");
break;
case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
printf("BTRFS_UUID_KEY_RECEIVED_SUBVOL");
break;
default:
printf("UNKNOWN.%d", type);
};
@ -554,15 +560,18 @@ 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_SUBVOL:
case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
printf("0x%016llx", (unsigned long long)objectid);
return;
}
switch (objectid) {
@ -620,6 +629,9 @@ 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;
@ -654,6 +666,10 @@ 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_SUBVOL:
case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
printf(" 0x%016llx)", (unsigned long long)offset);
break;
default:
if (offset == (u64)-1)
printf(" -1)");
@ -663,6 +679,25 @@ void btrfs_print_key(struct btrfs_disk_key *disk_key)
}
}
static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
u32 item_size)
{
if (item_size & (sizeof(u64) - 1)) {
printf("btrfs: uuid item with illegal size %lu!\n",
(unsigned long)item_size);
return;
}
while (item_size) {
u64 subvol_id;
read_extent_buffer(l, &subvol_id, offset, sizeof(u64));
subvol_id = le64_to_cpu(subvol_id);
printf("\t\tsubvol_id %llu\n", (unsigned long long)subvol_id);
item_size -= sizeof(u64);
offset += sizeof(u64);
}
}
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{
int i;
@ -879,6 +914,11 @@ 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_SUBVOL:
case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
print_uuid_item(l, btrfs_item_ptr_offset(l, i),
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);