The WARN_ON and warning from report_reserved_underflow can become very noisy and is visible unconditionally although this is namely for debugging. The patch "btrfs: Add WARN_ON for qgroup reserved underflow" (18dc22c19bef520cca11ce4c0807ac9dec48d31f) went to 4.11-rc1 and the plan was to get the fix as well, but this hasn't happened.
CC: Qu Wenruo <[email protected]> Signed-off-by: David Sterba <[email protected]> --- This is going to be submitted for 4.11 fs/btrfs/qgroup.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index a59801dc2a34..afbea61d957e 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1042,9 +1042,12 @@ static void report_reserved_underflow(struct btrfs_fs_info *fs_info, struct btrfs_qgroup *qgroup, u64 num_bytes) { - btrfs_warn(fs_info, +#ifdef CONFIG_BTRFS_DEBUG + WARN_ON(qgroup->reserved < num_bytes); + btrfs_debug(fs_info, "qgroup %llu reserved space underflow, have: %llu, to free: %llu", qgroup->qgroupid, qgroup->reserved, num_bytes); +#endif qgroup->reserved = 0; } /* @@ -1075,7 +1078,7 @@ static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info, qgroup->excl += sign * num_bytes; qgroup->excl_cmpr += sign * num_bytes; if (sign > 0) { - if (WARN_ON(qgroup->reserved < num_bytes)) + if (qgroup->reserved < num_bytes) report_reserved_underflow(fs_info, qgroup, num_bytes); else qgroup->reserved -= num_bytes; @@ -1100,7 +1103,7 @@ static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info, WARN_ON(sign < 0 && qgroup->excl < num_bytes); qgroup->excl += sign * num_bytes; if (sign > 0) { - if (WARN_ON(qgroup->reserved < num_bytes)) + if (qgroup->reserved < num_bytes) report_reserved_underflow(fs_info, qgroup, num_bytes); else @@ -2469,7 +2472,7 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, qg = unode_aux_to_qgroup(unode); - if (WARN_ON(qg->reserved < num_bytes)) + if (qg->reserved < num_bytes) report_reserved_underflow(fs_info, qg, num_bytes); else qg->reserved -= num_bytes; -- 2.12.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
