Re: kernel BUG at fs/btrfs/delayed-inode.c:1466!

2012/3/10 Jacek Luczak [off-list ref]:

2) A *regression* in 3.3.0-rc6-00197-g9f8050c
- completely unusable as reports ENOSPC
- to reproduce, mount volume and issue:
# CNT=3D1 ; while [ $CNT -lt 10000 ] ; do =A0rm -f /btrfs/dd ; ! touc=

h

/btrfs/dd && echo "$CNT" && break =A0; CNT=3D$(( $CNT + 1 )) ; done
On my host this shows:
# CNT=3D1 ; while [ $CNT -lt 10000 ] ; do =A0rm -f /btrfs/dd ; ! touc=

h

/btrfs/dd && echo "$CNT" && break =A0; CNT=3D$(( $CNT + 1 )) ; done
touch: cannot touch `/btrfs/dd': No space left on device
423
- remount to reset:
# CNT=3D1 ; while [ $CNT -lt 10000 ] ; do =A0rm -f /btrfs/dd ; ! touc=

h

/btrfs/dd && echo "$CNT" && break =A0; CNT=3D$(( $CNT + 1 )) ; done
touch: cannot touch `/btrfs/dd': No space left on device
1
# umount /btrfs/
# mount -t btrfs /dev/vg00/btrfs /btrfs/ -o noatime,nodatacow,default=

s

# CNT=3D1 ; while [ $CNT -lt 10000 ] ; do =A0rm -f /btrfs/dd ; ! touc=

h

/vdd && echo "$CNT" && break =A0; CNT=3D$(( $CNT + 1 )) ; done
touch: cannot touch `/btrfs/dd': No space left on device
423
- bisected down to 5500cdb (Btrfs: increase the global block reserve
estimates). After reverting this one Linus master works for me again.

This patch is included in 3.3-rc7. Do you plan to keep it or revert?

-jacek