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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: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2012-01-16 22:04:49 +02:00
parent a7e99c691a
commit de322263d3
1 changed files with 15 additions and 0 deletions
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15
fs/btrfs/ioctl.c
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@ -3106,6 +3106,20 @@ static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg)
ret = PTR_ERR(bargs);
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 {
bargs = NULL;
}
@ -3133,6 +3147,7 @@ static long btrfs_ioctl_balance(struct btrfs_root *root, void __user *arg)
bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
}
do_balance:
ret = btrfs_balance(bctl, bargs);
/*
* bctl is freed in __cancel_balance or in free_fs_info if