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block: Catch possible entries missing from hctx_state_name[]

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Add a build-time assert that we are not missing entries from
hctx_state_name[]. For this, create a separate enum for state flags and add
a "max" entry for BLK_MQ_S_x flags.

The numbering for those enum values is as default, so don't explicitly
number.

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240719112912.3830443-10-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2024-07-19 11:29:06 +00:00 committed by Jens Axboe
parent cce496de06
commit 23827310cc
2 changed files with 11 additions and 7 deletions
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1
block/blk-mq-debugfs.c
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@ -165,6 +165,7 @@ static int hctx_state_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = data;
BUILD_BUG_ON(ARRAY_SIZE(hctx_state_name) != BLK_MQ_S_MAX);
blk_flags_show(m, hctx->state, hctx_state_name,
ARRAY_SIZE(hctx_state_name));
seq_puts(m, "\n");

17
include/linux/blk-mq.h
View File

@ -663,13 +663,6 @@ enum {
BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 7,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
BLK_MQ_S_STOPPED = 0,
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
/* hw queue is inactive after all its CPUs become offline */
BLK_MQ_S_INACTIVE = 3,
};
#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
@ -681,6 +674,16 @@ enum {
#define BLK_MQ_MAX_DEPTH (10240)
#define BLK_MQ_NO_HCTX_IDX (-1U)
enum {
/* Keep hctx_state_name[] in sync with the definitions below */
BLK_MQ_S_STOPPED,
BLK_MQ_S_TAG_ACTIVE,
BLK_MQ_S_SCHED_RESTART,
/* hw queue is inactive after all its CPUs become offline */
BLK_MQ_S_INACTIVE,
BLK_MQ_S_MAX
};
struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set,
struct queue_limits *lim, void *queuedata,
struct lock_class_key *lkclass);