Dne 29.9.2011 16:10, Kasatkin, Dmitry napsal(a): > Hello, > > > On Thu, Sep 29, 2011 at 4:42 PM, Zdenek Kabelac <zkabelac@xxxxxxxxxx> wrote: >> Dne 29.9.2011 15:35, Kasatkin, Dmitry napsal(a): >>> Hello All, >>> >>> I would like to implement such block device, which can store >>> additional information along with the block data. >>> For example. so if file system has 4k block, I would like to store >>> 4k+256b of additional information... >>> >>> Can such block device be implemented with device mapper? >>> >> >> Yes - i.e.the old snapshot target stores the block and it's remapping info >> (thought the size info is much smaller then 256b) >> > > 1. Old snapshot target? Where is it... > kernel/drivers/md/dm-snap-persistent.c > 2. Isn't it stores some data at the beginning of the block device - in > the header.. A bit more complicated that this - but yes, quite straightforward target. Zdenek -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
