Btrfs: resume balance on rw (re)mounts properly
This introduces btrfs_resume_balance_async(), which, given that
restriper state was recovered earlier by btrfs_recover_balance(),
resumes balance in btrfs-balance kthread.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 48943d0..ecaad40 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2845,28 +2845,46 @@
static int balance_kthread(void *data)
{
- struct btrfs_balance_control *bctl =
- (struct btrfs_balance_control *)data;
- struct btrfs_fs_info *fs_info = bctl->fs_info;
+ struct btrfs_fs_info *fs_info = data;
int ret = 0;
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&fs_info->balance_mutex);
- set_balance_control(bctl);
-
- if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
- printk(KERN_INFO "btrfs: force skipping balance\n");
- } else {
+ if (fs_info->balance_ctl) {
printk(KERN_INFO "btrfs: continuing balance\n");
- ret = btrfs_balance(bctl, NULL);
+ ret = btrfs_balance(fs_info->balance_ctl, NULL);
}
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);
+
return ret;
}
+int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info)
+{
+ struct task_struct *tsk;
+
+ spin_lock(&fs_info->balance_lock);
+ if (!fs_info->balance_ctl) {
+ spin_unlock(&fs_info->balance_lock);
+ return 0;
+ }
+ spin_unlock(&fs_info->balance_lock);
+
+ if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
+ printk(KERN_INFO "btrfs: force skipping balance\n");
+ return 0;
+ }
+
+ tsk = kthread_run(balance_kthread, fs_info, "btrfs-balance");
+ if (IS_ERR(tsk))
+ return PTR_ERR(tsk);
+
+ return 0;
+}
+
int btrfs_recover_balance(struct btrfs_fs_info *fs_info)
{
struct btrfs_balance_control *bctl;