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Btrfs: Implement generation numbers in block pointers

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-12-11 09:25:06 -05:00
parent 17636e03f4
commit 74493f7a59
3 changed files with 115 additions and 8 deletions
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16
fs/btrfs/ctree.c
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@ -114,6 +114,9 @@ static int __btrfs_cow_block(struct btrfs_trans_handle *trans,
} else {
btrfs_set_node_blockptr(parent, parent_slot,
cow->start);
WARN_ON(trans->transid == 0);
btrfs_set_node_ptr_generation(parent, parent_slot,
trans->transid);
btrfs_mark_buffer_dirty(parent);
WARN_ON(btrfs_header_generation(parent) != trans->transid);
btrfs_free_extent(trans, root, buf->start, buf->len, 1);
@ -967,6 +970,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
{
struct extent_buffer *b;
u64 bytenr;
u64 ptr_gen;
int slot;
int ret;
int level;
@ -1031,10 +1035,18 @@ again:
if (level == lowest_level)
break;
bytenr = btrfs_node_blockptr(b, slot);
ptr_gen = btrfs_node_ptr_generation(b, slot);
if (should_reada)
reada_for_search(root, p, level, slot);
b = read_tree_block(root, bytenr,
btrfs_level_size(root, level - 1));
if (ptr_gen != btrfs_header_generation(b)) {
printk("block %llu bad gen wanted %llu "
"found %llu\n",
(unsigned long long)b->start,
(unsigned long long)ptr_gen,
(unsigned long long)btrfs_header_generation(b));
}
} else {
p->slots[level] = slot;
if (ins_len > 0 && btrfs_leaf_free_space(root, b) <
@ -1218,6 +1230,8 @@ static int insert_new_root(struct btrfs_trans_handle *trans,
btrfs_node_key(lower, &lower_key, 0);
btrfs_set_node_key(c, &lower_key, 0);
btrfs_set_node_blockptr(c, 0, lower->start);
WARN_ON(btrfs_header_generation(lower) == 0);
btrfs_set_node_ptr_generation(c, 0, btrfs_header_generation(lower));
btrfs_mark_buffer_dirty(c);
@ -1261,6 +1275,8 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
}
btrfs_set_node_key(lower, key, slot);
btrfs_set_node_blockptr(lower, slot, bytenr);
WARN_ON(trans->transid == 0);
btrfs_set_node_ptr_generation(lower, slot, trans->transid);
btrfs_set_header_nritems(lower, nritems + 1);
btrfs_mark_buffer_dirty(lower);
return 0;