On Thu, Sep 29, 2011 at 5:19 PM, Zdenek Kabelac <zkabelac@xxxxxxxxxx> wrote: > 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. > Thanks > > Zdenek > > -- > 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
