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Btrfs: build up error handling for merge_reloc_roots 

We first use btrfs_std_error hook to replace with BUG_ON, and we
also need to cleanup what is left, including reloc roots rbtree
and reloc roots list.
Here we use a helper function to cleanup both rbtree and list, and
since this function can also be used in the balance recover path,
we also make the change as well to keep code simple.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2013-03-04 16:25:37 +00:00 committed by Josef Bacik
parent 8f71f3e0e4
commit aca1bba6f9
1 changed files with 35 additions and 12 deletions
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47
fs/btrfs/relocation.c
View File

@ -2239,6 +2239,21 @@ again:
return err;
}
static noinline_for_stack
void free_reloc_roots(struct list_head *list)
{
struct btrfs_root *reloc_root;
while (!list_empty(list)) {
reloc_root = list_entry(list->next, struct btrfs_root,
root_list);
__update_reloc_root(reloc_root, 1);
free_extent_buffer(reloc_root->node);
free_extent_buffer(reloc_root->commit_root);
kfree(reloc_root);
}
}
static noinline_for_stack
int merge_reloc_roots(struct reloc_control *rc)
{
@ -2246,7 +2261,7 @@ int merge_reloc_roots(struct reloc_control *rc)
struct btrfs_root *reloc_root;
LIST_HEAD(reloc_roots);
int found = 0;
int ret;
int ret = 0;
again:
root = rc->extent_root;
@ -2272,20 +2287,33 @@ again:
BUG_ON(root->reloc_root != reloc_root);
ret = merge_reloc_root(rc, root);
BUG_ON(ret);
if (ret)
goto out;
} else {
list_del_init(&reloc_root->root_list);
}
ret = btrfs_drop_snapshot(reloc_root, rc->block_rsv, 0, 1);
BUG_ON(ret < 0);
if (ret < 0) {
if (list_empty(&reloc_root->root_list))
list_add_tail(&reloc_root->root_list,
&reloc_roots);
goto out;
}
}
if (found) {
found = 0;
goto again;
}
out:
if (ret) {
btrfs_std_error(root->fs_info, ret);
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
}
BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root));
return 0;
return ret;
}
static void free_block_list(struct rb_root *blocks)
@ -4266,14 +4294,9 @@ int btrfs_recover_relocation(struct btrfs_root *root)
out_free:
kfree(rc);
out:
while (!list_empty(&reloc_roots)) {
reloc_root = list_entry(reloc_roots.next,
struct btrfs_root, root_list);
list_del(&reloc_root->root_list);
free_extent_buffer(reloc_root->node);
free_extent_buffer(reloc_root->commit_root);
kfree(reloc_root);
}
if (!list_empty(&reloc_roots))
free_reloc_roots(&reloc_roots);
btrfs_free_path(path);
if (err == 0) {