Bug 16066

Summary:	brtfs full at 85% usage
Product:	File System	Reporter:	Brian J. Murrell (brian)
Component:	btrfs	Assignee:	fs_btrfs (fs_btrfs)
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	chris.mason, josef
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.32.11	Subsystem:
Regression:	No	Bisected commit-id:

Description Brian J. Murrell 2010-05-28 13:16:14 UTC

I'm using Ubuntu's 2.6.32-21-generic kernel and I created a 48GB btrfs filesystem to hold approx. 2M files.

The filesystem is at 85% full and returning ENOSPC when I try to create anything new on it.  I got a spew of messages in the kernel message buffer which I don't know are related, but I thought I would provide them anyway:

19:12:44 kernel [  721.973362] space_info has 8142848 free, is full
19:12:44 kernel [  721.973389] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.976174] space_info has 8142848 free, is full
19:12:44 kernel [  721.976195] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.976690] space_info has 8142848 free, is full
19:12:44 kernel [  721.976711] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.977454] space_info has 8142848 free, is full
19:12:44 kernel [  721.977479] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.978034] space_info has 8142848 free, is full
19:12:44 kernel [  721.978055] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.978549] space_info has 8142848 free, is full
19:12:44 kernel [  721.978570] space_info total=3221225472, pinned=8335360, delalloc=0, may_use=0, used=3203059712, root=2875392, super=65536, reserved=1622016
19:12:44 kernel [  721.979076] space_info has 8142848 free, is full

Comment 1 Chris Mason 2010-05-28 13:19:02 UTC

Later kernels are much more effective at filling the disk, especially the 2.6.34 kernel with the latest commits from the btrfs-unstable tree.

This is something that we are actively working on.

Comment 2 Josef Bacik 2013-04-30 15:54:48 UTC

Closing, if this is still affecting you on a newer kernel please reopen.