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btrfs: don't include the global rsv size in the preemptive used amount

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When deciding if we should preemptively flush space, we will add in the
amount of space used by all block rsvs.  However this also includes the
global block rsv, which isn't flushable so shouldn't be accounted for in
this calculation.  If we decide to use ->bytes_may_use in our used
calculation we need to subtract the global rsv size from this amount so
it most closely matches the flushable space.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-04-28 13:38:46 -04:00 committed by David Sterba
parent 1239e2da16
commit 30acce4eb0
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/space-info.c
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@ -871,7 +871,7 @@ static bool need_preemptive_reclaim(struct btrfs_fs_info *fs_info,
used += fs_info->delayed_refs_rsv.reserved +
fs_info->delayed_block_rsv.reserved;
else
used += space_info->bytes_may_use;
used += space_info->bytes_may_use - global_rsv_size;
return (used >= thresh && !btrfs_fs_closing(fs_info) &&
!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));