12.04.2017 14:20, Austin S. Hemmelgarn пишет: > On 2017-04-12 00:18, Chris Murphy wrote: >> 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. >> > That said, there is a tool to translate that back, and depending on how > detailed you want to get, that may be more efficient than debug tree. Could you give pointer to this tool? I use filefrag on bootinfoscript to display physical disk offset of files of interest to bootloader. I was not aware it shows logical offset which makes it kinda pointless. -- 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
