@@ -3352,6 +3352,7 @@ void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
u64 *bytes_to_reserve);
int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending);
+int should_cancel_balance(struct btrfs_fs_info *fs_info);
/* scrub.c */
int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
@@ -9,6 +9,7 @@
#include <linux/blkdev.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
+#include <linux/error-injection.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@@ -3223,6 +3224,16 @@ int setup_extent_mapping(struct inode *inode, u64 start, u64 end,
return ret;
}
+/*
+ * This wrapper is to allow error injection to fully test all cancel
+ * call sites.
+ */
+int should_cancel_balance(struct btrfs_fs_info *fs_info)
+{
+ return atomic_read(&fs_info->balance_cancel_req);
+}
+ALLOW_ERROR_INJECTION(should_cancel_balance, TRUE);
+
static int relocate_file_extent_cluster(struct inode *inode,
struct file_extent_cluster *cluster)
{
@@ -3856,7 +3856,7 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
if (btrfs_fs_closing(fs_info) ||
atomic_read(&fs_info->balance_pause_req) ||
- atomic_read(&fs_info->balance_cancel_req)) {
+ should_cancel_balance(fs_info)) {
ret = -EINVAL;
goto out;
}
Introduce a new error injection point, should_cancel_balance(). It's just a wrapper of atomic_read(&fs_info->balance_cancel_req), but allows us to override the return value. Currently there are only one locations using this function: - btrfs_balance() It checks cancel before each block group. There are other locations checking fs_info->balance_cancel_req, but they are not used as an indicator to exit, so there is no need to use the wrapper. But there will be more locations coming, and some locations can cause kernel panic if not handled properly. So introduce this error injection to provide better test interface. Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/ctree.h | 1 + fs/btrfs/relocation.c | 11 +++++++++++ fs/btrfs/volumes.c | 2 +- 3 files changed, 13 insertions(+), 1 deletion(-)