On Fri, Mar 08, 2024 at 11:37:13PM +0000, Mike Fleetwood wrote: > On Fri, 8 Mar 2024 at 01:23, Kent Overstreet <[email protected]> > wrote: > > > > On Wed, Mar 06, 2024 at 11:14:45AM +0000, Mike Fleetwood wrote: > > > On 2024-03-02 04:14, Kent Overstreet wrote: > > > > I'm currently updating the 'bcachefs fs usage' command for the disk > > > > accounting rewrite, and looking for suggestions on any improements we > > > > could make - ways to present the output that would be clearer and more > > > > useful, possibly ideas on on new things to count... > > > > > > [Sorry for any email thread butchering. I've only just subscribed to > > > the list and seen this in the archive.] > > > > > > Background: > > > I'm working on adding some level of support for bcachefs into GParted. > > > It wants to be able to report the FS usage (per device) of a file system > > > to (1) display in the UI, and (2) to limit how small it allows a > > > partition to be shrunk. (I understand that bcachefs doesn't currently > > > support shrinking devices). > > > > > > What I would like from bcache fs usage is: > > > 1. To be able to get free and capacity figures for a device in an > > > unmounted bcachefs file system. > > > EG: > > > bcachefs fs usage /dev/$PTN > > > > that'll take some work, but should be doable > > > > > 2. To continue to be able to get free and capacity figures in bytes. > > > Using a command line switch is okay. > > > > json output? > > Json output is not required. Plain human readable text will do.
But it'll be a lot less fragile as things change and are added. We really should be getting away from machine parsing of output intended for humans. > > None of the other file system tools provide json output so GParted just > parses the plain text output they do provide. These are the commands > GParted runs and parses the output from to get usage figures for a few > of the file systems it supports: > btrfs inspect-internal dump-super /dev/$PTN > dumpe2fs -h /dev/$PTN > xfs_db -r -c 'sb 0' -c 'print blocksize' -c 'print dblocks' \ > -c 'print fdblocks' /dev/$PTN
