@@ -62,6 +62,10 @@ struct raid_kobject {
.store = _store, \
}
+#define BTRFS_ATTR_W(_prefix, _name, _store) \
+ static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
+ __INIT_KOBJ_ATTR(_name, 0200, NULL, _store)
+
#define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
@@ -785,6 +789,54 @@ static ssize_t btrfs_chunk_size_store(struct kobject *kobj,
return val;
}
+#ifdef CONFIG_BTRFS_DEBUG
+/*
+ * Request chunk allocation with current chunk size.
+ */
+static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj,
+ struct kobj_attribute *a,
+ const char *buf, size_t len)
+{
+ struct btrfs_space_info *space_info = to_space_info(kobj);
+ struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj));
+ struct btrfs_trans_handle *trans;
+ unsigned long val;
+ int ret;
+
+ if (!fs_info) {
+ pr_err("couldn't get fs_info\n");
+ return -EPERM;
+ }
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (sb_rdonly(fs_info->sb))
+ return -EROFS;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val == 0)
+ return -EINVAL;
+
+ /*
+ * Allocate new chunk.
+ */
+ trans = btrfs_start_transaction(fs_info->extent_root, 0);
+ if (!trans)
+ return PTR_ERR(trans);
+ ret = btrfs_force_chunk_alloc(trans, space_info->flags);
+ btrfs_end_transaction(trans);
+
+ if (ret == 1)
+ return len;
+
+ return -ENOSPC;
+}
+#endif
+
SPACE_INFO_ATTR(flags);
SPACE_INFO_ATTR(total_bytes);
SPACE_INFO_ATTR(bytes_used);
@@ -797,6 +849,9 @@ SPACE_INFO_ATTR(disk_used);
SPACE_INFO_ATTR(disk_total);
BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show,
btrfs_chunk_size_store);
+#ifdef CONFIG_BTRFS_DEBUG
+BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store);
+#endif
/*
* Allocation information about block group types.
@@ -815,6 +870,9 @@ static struct attribute *space_info_attrs[] = {
BTRFS_ATTR_PTR(space_info, disk_used),
BTRFS_ATTR_PTR(space_info, disk_total),
BTRFS_ATTR_PTR(space_info, chunk_size),
+#ifdef CONFIG_BTRFS_DEBUG
+ BTRFS_ATTR_PTR(space_info, force_chunk_alloc),
+#endif
NULL,
};
ATTRIBUTE_GROUPS(space_info);