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Btrfs: fill relocation block rsv after allocation

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Since we set the reloc control before we've reserved our space for relocation we
could race with a root being dirtied and not actually have space to do our init
reloc root.  So once we've allocated it and set it up go ahead and make our
reservation before setting the relocate control, that way anybody who tries to
do the reloc root init has space to use.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2016-05-27 13:08:26 -04:00 committed by David Sterba
parent 40acc3eede
commit ac2fabac42
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/relocation.c
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@ -3871,6 +3871,7 @@ static noinline_for_stack
int prepare_to_relocate(struct reloc_control *rc)
{
struct btrfs_trans_handle *trans;
int ret;
rc->block_rsv = btrfs_alloc_block_rsv(rc->extent_root,
BTRFS_BLOCK_RSV_TEMP);
@ -3885,6 +3886,11 @@ int prepare_to_relocate(struct reloc_control *rc)
rc->reserved_bytes = 0;
rc->block_rsv->size = rc->extent_root->nodesize *
RELOCATION_RESERVED_NODES;
ret = btrfs_block_rsv_refill(rc->extent_root,
rc->block_rsv, rc->block_rsv->size,
BTRFS_RESERVE_FLUSH_ALL);
if (ret)
return ret;
rc->create_reloc_tree = 1;
set_reloc_control(rc);