btrfs: Add WARN_ON for qgroup reserved underflow
Goldwyn Rodrigues has exposed and fixed a bug which underflows btrfs qgroup reserved space, and leads to non-writable fs. This reminds us that we don't have enough underflow check for qgroup reserved space. For underflow case, we should not really underflow the numbers but warn and keeps qgroup still work. So add more check on qgroup reserved space and add WARN_ON() and btrfs_warn() for any underflow case. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.com> Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -1038,6 +1038,15 @@ static void qgroup_dirty(struct btrfs_fs_info *fs_info,
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list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
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}
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static void report_reserved_underflow(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *qgroup,
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u64 num_bytes)
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{
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btrfs_warn(fs_info,
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"qgroup %llu reserved space underflow, have: %llu, to free: %llu",
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qgroup->qgroupid, qgroup->reserved, num_bytes);
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qgroup->reserved = 0;
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}
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/*
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* The easy accounting, if we are adding/removing the only ref for an extent
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* then this qgroup and all of the parent qgroups get their reference and
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@ -1065,8 +1074,12 @@ static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
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WARN_ON(sign < 0 && qgroup->excl < num_bytes);
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qgroup->excl += sign * num_bytes;
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qgroup->excl_cmpr += sign * num_bytes;
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if (sign > 0)
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qgroup->reserved -= num_bytes;
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if (sign > 0) {
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if (WARN_ON(qgroup->reserved < num_bytes))
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report_reserved_underflow(fs_info, qgroup, num_bytes);
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else
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qgroup->reserved -= num_bytes;
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}
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qgroup_dirty(fs_info, qgroup);
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@ -1086,8 +1099,13 @@ static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
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qgroup->rfer_cmpr += sign * num_bytes;
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WARN_ON(sign < 0 && qgroup->excl < num_bytes);
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qgroup->excl += sign * num_bytes;
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if (sign > 0)
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qgroup->reserved -= num_bytes;
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if (sign > 0) {
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if (WARN_ON(qgroup->reserved < num_bytes))
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report_reserved_underflow(fs_info, qgroup,
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num_bytes);
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else
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qgroup->reserved -= num_bytes;
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}
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qgroup->excl_cmpr += sign * num_bytes;
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qgroup_dirty(fs_info, qgroup);
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@ -2424,7 +2442,10 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
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qg = unode_aux_to_qgroup(unode);
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qg->reserved -= num_bytes;
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if (WARN_ON(qg->reserved < num_bytes))
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report_reserved_underflow(fs_info, qg, num_bytes);
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else
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qg->reserved -= num_bytes;
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list_for_each_entry(glist, &qg->groups, next_group) {
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ret = ulist_add(fs_info->qgroup_ulist,
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