On Tue, Apr 11, 2017 at 3:00 PM, Adam Borowski <kilobyte@xxxxxxxxxx> wrote: > On Tue, Apr 11, 2017 at 12:15:32PM -0700, Amin Hassani wrote: >> I am working on a project with Btrfs and I was wondering if there is >> any way to see the disk layout of the btrfs image. Let's assume I have >> a read-only btrfs image with compression on and only using one disk >> (no raid or anything). Is it possible to get a set of offset-lengths >> for each file > > While btrfs-specific ioctls give more information, you might want to look at > FIEMAP (Documentation/filesystems/fiemap.txt) as it works on most > filesystems, not just btrfs. One interface to FIEMAP is provided in > "/usr/sbin/filefrag -v". Good idea. Although, on Btrfs I'm pretty sure it reports the Btrfs (internal) logical addressing; not the actual physical sector address on the drive. So it depends on what the original poster is trying to discover. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
