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At qgroup.c:try_flush_qgroup() we are asserting that current->journal_info
is either NULL or has the value BTRFS_SEND_TRANS_STUB.
However allowing for BTRFS_SEND_TRANS_STUB makes no sense because:
1) It is misleading, because send operations are read-only and do not
ever need to reserve qgroup space;
2) We already assert that current->journal_info != BTRFS_SEND_TRANS_STUB
at transaction.c:start_transaction();
3) On a kernel without CONFIG_BTRFS_ASSERT=y set, it would result in
a crash if try_flush_qgroup() is ever called in a send context, because
at transaction.c:start_transaction we cast current->journal_info into
a struct btrfs_trans_handle pointer and then dereference it.
So just do allow a send context at try_flush_qgroup() and update the
comment about it.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
ffb7c2e923