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block: Catch possible entries missing from hctx_flag_name[]

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Refresh values in BLK_MQ_F_x enum, and then re-arrange members in
hctx_flag_name[] to match that enum. Renumber
BLK_MQ_F_ALLOC_POLICY_START_BIT to match the value refresh.

Add a BUILD_BUG_ON() call to ensure that we are not missing entries in
hctx_flag_name[].

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240719112912.3830443-11-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2024-07-19 11:29:07 +00:00 committed by Jens Axboe
parent 23827310cc
commit 226f0f6afc
2 changed files with 9 additions and 4 deletions
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3
block/blk-mq-debugfs.c
View File

@ -196,6 +196,9 @@ static int hctx_flags_show(void *data, struct seq_file *m)
struct blk_mq_hw_ctx *hctx = data;
const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
BUILD_BUG_ON(ARRAY_SIZE(hctx_flag_name) !=
BLK_MQ_F_ALLOC_POLICY_START_BIT);
seq_puts(m, "alloc_policy=");
if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
alloc_policy_name[alloc_policy])

10
include/linux/blk-mq.h
View File

@ -644,6 +644,7 @@ struct blk_mq_ops {
#endif
};
/* Keep hctx_flag_name[] in sync with the definitions below */
enum {
BLK_MQ_F_SHOULD_MERGE = 1 << 0,
BLK_MQ_F_TAG_QUEUE_SHARED = 1 << 1,
@ -653,15 +654,16 @@ enum {
*/
BLK_MQ_F_STACKING = 1 << 2,
BLK_MQ_F_TAG_HCTX_SHARED = 1 << 3,
BLK_MQ_F_BLOCKING = 1 << 5,
BLK_MQ_F_BLOCKING = 1 << 4,
/* Do not allow an I/O scheduler to be configured. */
BLK_MQ_F_NO_SCHED = 1 << 6,
BLK_MQ_F_NO_SCHED = 1 << 5,
/*
* Select 'none' during queue registration in case of a single hwq
* or shared hwqs instead of 'mq-deadline'.
*/
BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 7,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 6,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 7,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
};
#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \