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List:       linux-btrfs
Subject:    What's enospc_debug telling me?
From:       E V <eliventer () gmail ! com>
Date:       2014-03-28 13:57:02
Message-ID: CAJtFHUSbuOPy=r23-+_vB8zCJ7eMDJWtMYzGB+ntMVGncX=9gA () mail ! gmail ! com
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Doing a data balance profile conversion raid0->single fails with
enospc, even given lots of space. So tried out enospc_debug:

Mar 28 08:48:44 btrfs: relocating block group 579997815275520 flags 9
Mar 28 08:58:06 space_info 1 has 1574929309696 free, is not full
Mar 28 08:58:06 space_info total=70404177657856, used=68829248086016,
pinned=0, reserved=0, may_use=3175444480, readonly=262144
Mar 28 08:58:06 block group 579901178511360 has 3221225472 bytes,
3221225472 used 0 pinned 0 reserved
Mar 28 08:58:06 block group has cluster?: no
Mar 28 08:58:06 0 blocks of free space at or bigger than bytes is
Mar 28 08:58:06 block group 579904399736832 has 3221225472 bytes,
3221225472 used 0 pinned 0 reserved
Mar 28 08:58:06 block group has cluster?: no

... about 3 million lines later with different block group numbers it ends at

Mar 28 09:16:48 block group 607319175987200 has 1073741824 bytes, 0
used 0 pinned 0 reserved
Mar 28 09:16:48 block group has cluster?: no
Mar 28 09:16:48 0 blocks of free space at or bigger than bytes is
Mar 28 09:16:48 block group 607320249729024 has 1073741824 bytes, 0
used 0 pinned 0 reserved
Mar 28 09:16:48 block group has cluster?: no
Mar 28 09:16:48 0 blocks of free space at or bigger than bytes is
Mar 28 09:16:48 btrfs: 17 enospc errors during balance

space info:
Total devices 3 FS bytes used 62.69TiB
devid    1 size 30.01TiB used 18.16TiB path /dev/sdb
devid    2 size 30.01TiB used 18.17TiB path /dev/sdc
devid    3 size 40.02TiB used 28.01TiB path /dev/sdd

Data, RAID0: total=9.72TiB, used=9.72TiB
Data, single: total=54.36TiB, used=52.88TiB
System, RAID1: total=40.00MiB, used=6.80MiB
Metadata, RAID1: total=134.00GiB, used=89.69GiB
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