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Commit de322263 authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

Btrfs: allow for resuming restriper after it was paused 



Recognize BTRFS_BALANCE_RESUME flag passed from userspace.  We use the
same heuristics used when recovering balance after a crash to try to
start where we left off last time.

Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent a7e99c69

fs/btrfs/ioctl.c

+15 −0
Original line number Original line Diff line number Diff line
@@ -3106,6 +3106,20 @@ static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg) 
			ret = PTR_ERR(bargs);

			ret = PTR_ERR(bargs);

			goto out;

			goto out;

		}

		}



		if (bargs->flags & BTRFS_BALANCE_RESUME) {

			if (!fs_info->balance_ctl) {

				ret = -ENOTCONN;

				goto out_bargs;

			}



			bctl = fs_info->balance_ctl;

			spin_lock(&fs_info->balance_lock);

			bctl->flags |= BTRFS_BALANCE_RESUME;

			spin_unlock(&fs_info->balance_lock);



			goto do_balance;

		}

	} else {

	} else {

		bargs = NULL;

		bargs = NULL;

	}

	}
@@ -3133,6 +3147,7 @@ static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg) 
		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;

		bctl->flags |= BTRFS_BALANCE_TYPE_MASK;

	}

	}





do_balance:

	ret = btrfs_balance(bctl, bargs);

	ret = btrfs_balance(bctl, bargs);

	/*

	/*

	 * bctl is freed in __cancel_balance or in free_fs_info if

	 * bctl is freed in __cancel_balance or in free_fs_info if