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Btrfs: reada while dropping snapshots 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-06-19 16:23:05 -04:00 committed by David Woodhouse
parent 85e55b13e4
commit e011599b0f
1 changed files with 30 additions and 1 deletions
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31
fs/btrfs/extent-tree.c
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@ -940,7 +940,6 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
int wrapped = 0;
u64 limit;
path = btrfs_alloc_path();
ins->flags = 0;
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
@ -974,6 +973,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
data, 1);
}
path = btrfs_alloc_path();
check_failed:
if (!block_group->data)
search_start = find_search_start(root, &block_group,
@ -1355,6 +1356,28 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
return 0;
}
static void reada_walk_down(struct btrfs_root *root,
struct btrfs_node *node)
{
int i;
u32 nritems;
u64 blocknr;
int ret;
u32 refs;
nritems = btrfs_header_nritems(&node->header);
for (i = 0; i < nritems; i++) {
blocknr = btrfs_node_blockptr(node, i);
ret = lookup_extent_ref(NULL, root, blocknr, 1, &refs);
BUG_ON(ret);
if (refs != 1)
continue;
ret = readahead_tree_block(root, blocknr);
if (ret)
break;
}
}
/*
* helper function for drop_snapshot, this walks down the tree dropping ref
* counts as it goes.
@ -1375,6 +1398,7 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
BUG_ON(ret);
if (refs > 1)
goto out;
/*
* walk down to the last node level and free all the leaves
*/
@ -1382,8 +1406,13 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
cur = path->nodes[*level];
if (*level > 0 && path->slots[*level] == 0)
reada_walk_down(root, btrfs_buffer_node(cur));
if (btrfs_header_level(btrfs_buffer_header(cur)) != *level)
WARN_ON(1);
if (path->slots[*level] >=
btrfs_header_nritems(btrfs_buffer_header(cur)))
break;