Re: Simple quota unsafe (FIXED: btrfstune --remove-simple-quota worked)

[Marc MERLIN <marc_btrfs@merlins.org>]

Ok, we have a winner!

> > > I also think "btrfstune --remove-simple-quota" may fix your fs. It will
> > > have to do work in O(extents), and might fail in its fake mount, though.
> >  
> > moremagic:/tmp# btrfstune --remove-simple-quota /dev/mapper/crypt_bcache0
> > bad eb member end: ptr 0x4000 start 15495725432832 member offset 16384 size 1
> > bad eb member end: ptr 0x4000 start 16568941559808 member offset 16384 size 1

Took a while to remove the quota, but once it did:

moremagic:/tmp# mount -o rw,enospc_debug,skip_balance /dev/mapper/crypt_bcache0 /mnt/btrfs_bigbackup
moremagic:/tmp# cd /mnt/btrfs_bigbackup
moremagic:/mnt/btrfs_bigbackup# btrfs balance cancel `pwd`
BTRFS info (device dm-0): setting compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device dm-0): setting compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BTRFS info (device dm-0): balance: resume skipped
BTRFS info (device dm-0): checking UUID tree
BTRFS info (device dm-0): enabling ssd optimizations
BTRFS info (device dm-0): enabling free space tree
BTRFS info (device dm-0): balance: canceled

And now I'm good. I can re-re-convert to block group trees (took hours
overnight to go back):
moremagic:~# btrfstune --convert-to-block-group-tree  /dev/mapper/crypt_bcache0
Converted the filesystem to block group tree feature

moremagic:~# mount /dev/mapper/crypt_bcache0 /mnt/btrfs_bigbackup
BTRFS: device label DS6 devid 1 transid 298273 /dev/mapper/crypt_bcache0 (251:0) scanned by mount (1030419)
BTRFS info (device dm-0): first mount of filesystem a97dec85-a0d5-42ab-a0ef-e9b7479fbe43
BTRFS info (device dm-0): using crc32c (crc32c-generic) checksum algorithm
BTRFS info (device dm-0): forcing free space tree for sector size 4096 with page size 16384
BTRFS warning (device dm-0): read-write for sector size 4096 with page size 16384 is experimental
BTRFS info (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 5074, gen 0
BTRFS info (device dm-0): checking UUID tree
BTRFS info (device dm-0): enabling ssd optimizations
BTRFS info (device dm-0): enabling free space tree

I'm back in business, thank you.

Will definitely keep squota off for this one. Thanks again about the
--remove-simple-quota suggestion, of all the things I tried, this is one
I hadn't.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
 
Home page: http://marc.merlins.org/                       | PGP 7F55D5F27AAF9D08