On Tue, Sep 25, 2018 at 11:13:17PM -0400, monty wrote: > > Hi! I met a problem of dm-thin: a thin-pool has no volumes but its > nr_free_blocks_data is not zero. I guess the scene of this problem like: > a. create a thin volume thin01, size is 10GB; > b. write 10GB to thin01; > c. create a snapshot thin01-snap, orig is thin01; > d. write 10GB to thin01-snap; > e. for a data block of thin01-snap, which will be written by user, will > experience following steps: > 1. alloc a data block m firstly; > 2. wirte data to data block m; > 3. bio callback and assign data block m to thin01-snap. > If power loss happens between step 2 and step 3, data block will not > belong to any device but its ref count is not zero. > Is it a problem? How to solve this problem? Yes, there are a couple of ways this can happen, a dump and restore of the metadata will repair it. - Joe > > -- > dm-devel mailing list > dm-devel@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
