blk-throttle: Fix incorrect display of io.max

Commit bf20ab538c81 ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
attempts to revert the code change introduced by commit cd5ab1b0fcb4
("blk-throttle: add .low interface").  However, it leaves behind the
bps_conf[] and iops_conf[] fields in the throtl_grp structure which
aren't set anywhere in the new blk-throttle.c code but are still being
used by tg_prfill_limit() to display the limits in io.max. Now io.max
always displays the following values if a block queue is used:

	<m>:<n> rbps=0 wbps=0 riops=0 wiops=0

Fix this problem by removing bps_conf[] and iops_conf[] and use bps[]
and iops[] instead to complete the revert.

Fixes: bf20ab538c81 ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
Reported-by: Justin Forbes <jforbes@redhat.com>
Closes: https://github.com/containers/podman/issues/22701#issuecomment-2120627789
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240530134547.970075-1-longman@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 0be180f..c1bf73f 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1399,32 +1399,32 @@ static u64 tg_prfill_limit(struct seq_file *sf, struct blkg_policy_data *pd,
        bps_dft = U64_MAX;
        iops_dft = UINT_MAX;
 
-       if (tg->bps_conf[READ] == bps_dft &&
-           tg->bps_conf[WRITE] == bps_dft &&
-           tg->iops_conf[READ] == iops_dft &&
-           tg->iops_conf[WRITE] == iops_dft)
+       if (tg->bps[READ] == bps_dft &&
+           tg->bps[WRITE] == bps_dft &&
+           tg->iops[READ] == iops_dft &&
+           tg->iops[WRITE] == iops_dft)
                return 0;
 
        seq_printf(sf, "%s", dname);
-       if (tg->bps_conf[READ] == U64_MAX)
+       if (tg->bps[READ] == U64_MAX)
                seq_printf(sf, " rbps=max");
        else
-               seq_printf(sf, " rbps=%llu", tg->bps_conf[READ]);
+               seq_printf(sf, " rbps=%llu", tg->bps[READ]);
 
-       if (tg->bps_conf[WRITE] == U64_MAX)
+       if (tg->bps[WRITE] == U64_MAX)
                seq_printf(sf, " wbps=max");
        else
-               seq_printf(sf, " wbps=%llu", tg->bps_conf[WRITE]);
+               seq_printf(sf, " wbps=%llu", tg->bps[WRITE]);
 
-       if (tg->iops_conf[READ] == UINT_MAX)
+       if (tg->iops[READ] == UINT_MAX)
                seq_printf(sf, " riops=max");
        else
-               seq_printf(sf, " riops=%u", tg->iops_conf[READ]);
+               seq_printf(sf, " riops=%u", tg->iops[READ]);
 
-       if (tg->iops_conf[WRITE] == UINT_MAX)
+       if (tg->iops[WRITE] == UINT_MAX)
                seq_printf(sf, " wiops=max");
        else
-               seq_printf(sf, " wiops=%u", tg->iops_conf[WRITE]);
+               seq_printf(sf, " wiops=%u", tg->iops[WRITE]);
 
        seq_printf(sf, "\n");
        return 0;

diff --git a/block/blk-throttle.h b/block/blk-throttle.h
index 393c3d1..4d9ef5a 100644 (file)
--- a/block/blk-throttle.h
+++ b/block/blk-throttle.h
@@ -95,15 +95,11 @@ struct throtl_grp {
        bool has_rules_bps[2];
        bool has_rules_iops[2];
 
-       /* internally used bytes per second rate limits */
+       /* bytes per second rate limits */
        uint64_t bps[2];
-       /* user configured bps limits */
-       uint64_t bps_conf[2];
 
-       /* internally used IOPS limits */
+       /* IOPS limits */
        unsigned int iops[2];
-       /* user configured IOPS limits */
-       unsigned int iops_conf[2];
 
        /* Number of bytes dispatched in current slice */
        uint64_t bytes_disp[2];