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btrfs: test unaligned punch hole at ENOSPC

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Try to punch hole with unaligned size and offset when the FS is
full. Mainly holes are punched at locations which are unaligned
with the file extent boundaries when the FS is full by data.
As the punching holes at unaligned location will involve
truncating blocks instead of just dropping the extents, it shall
involve reserving data and metadata space for delalloc and so data
alloc fails as the FS is full.

btrfs_punch_hole()
 btrfs_truncate_block()
   btrfs_check_data_free_space() <-- ENOSPC

We don't fail punch hole if the holes are aligned with the file
extent boundaries as it shall involve just dropping the related
extents, without truncating data extent blocks.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Anand Jain
2018-09-30 09:39:52 +08:00
committed by Eryu Guan
parent 1895cf6b65
commit 4c2c678cd5
3 changed files with 76 additions and 0 deletions
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tests/btrfs/group
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@@ -174,3 +174,4 @@
169 auto quick send
170 auto quick snapshot
171 auto quick qgroup
172 auto quick punch