[dm-devel] [PATCH, resend] block: remove QUEUE_FLAG_STACKABLE
Christoph Hellwig
hch at lst.de
Thu Oct 5 19:22:52 UTC 2017
We already have a queue_is_rq_based helper to check if a request_queue
is request based, so we can remove the flag for it.
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
block/blk-mq-debugfs.c | 1 -
block/elevator.c | 2 +-
drivers/md/dm-rq.c | 2 +-
drivers/md/dm-table.c | 15 +--------------
drivers/md/dm.c | 11 -----------
include/linux/blkdev.h | 5 -----
6 files changed, 3 insertions(+), 33 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 980e73095643..7f4a1ba532af 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -54,7 +54,6 @@ static const char *const blk_queue_flag_name[] = {
QUEUE_FLAG_NAME(NOMERGES),
QUEUE_FLAG_NAME(SAME_COMP),
QUEUE_FLAG_NAME(FAIL_IO),
- QUEUE_FLAG_NAME(STACKABLE),
QUEUE_FLAG_NAME(NONROT),
QUEUE_FLAG_NAME(IO_STAT),
QUEUE_FLAG_NAME(DISCARD),
diff --git a/block/elevator.c b/block/elevator.c
index 153926a90901..7ae50eb2732b 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -1118,7 +1118,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
struct elevator_type *__e;
int len = 0;
- if (!blk_queue_stackable(q))
+ if (!queue_is_rq_based(q))
return sprintf(name, "none\n");
if (!q->elevator)
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index eadfcfd106ff..9d32f25489c2 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -56,7 +56,7 @@ static unsigned dm_get_blk_mq_queue_depth(void)
int dm_request_based(struct mapped_device *md)
{
- return blk_queue_stackable(md->queue);
+ return queue_is_rq_based(md->queue);
}
static void dm_old_start_queue(struct request_queue *q)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index ef7b8f201f73..75281828f2cb 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1000,7 +1000,7 @@ static int dm_table_determine_type(struct dm_table *t)
list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
- if (!blk_queue_stackable(q)) {
+ if (!queue_is_rq_based(q)) {
DMERR("table load rejected: including"
" non-request-stackable devices");
return -EINVAL;
@@ -1847,19 +1847,6 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
*/
if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
-
- /*
- * QUEUE_FLAG_STACKABLE must be set after all queue settings are
- * visible to other CPUs because, once the flag is set, incoming bios
- * are processed by request-based dm, which refers to the queue
- * settings.
- * Until the flag set, bios are passed to bio-based dm and queued to
- * md->deferred where queue settings are not needed yet.
- * Those bios are passed to request-based dm at the resume time.
- */
- smp_mb();
- if (dm_table_request_based(t))
- queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q);
}
unsigned int dm_table_get_num_targets(struct dm_table *t)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6e54145969c5..8d07ad61221c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1612,17 +1612,6 @@ static void dm_wq_work(struct work_struct *work);
void dm_init_md_queue(struct mapped_device *md)
{
- /*
- * Request-based dm devices cannot be stacked on top of bio-based dm
- * devices. The type of this dm device may not have been decided yet.
- * The type is decided at the first table loading time.
- * To prevent problematic device stacking, clear the queue flag
- * for request stacking support until then.
- *
- * This queue is new, so no concurrency on the queue_flags.
- */
- queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
-
/*
* Initialize data that will only be used by a non-blk-mq DM queue
* - must do so here (in alloc_dev callchain) before queue is used
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 02fa42d24b52..9fb71fc7d0e8 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -609,7 +609,6 @@ struct request_queue {
#define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
#define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
-#define QUEUE_FLAG_STACKABLE 8 /* supports request stacking */
#define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
#define QUEUE_FLAG_IO_STAT 10 /* do IO stats */
@@ -633,12 +632,10 @@ struct request_queue {
#define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
- (1 << QUEUE_FLAG_STACKABLE) | \
(1 << QUEUE_FLAG_SAME_COMP) | \
(1 << QUEUE_FLAG_ADD_RANDOM))
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
- (1 << QUEUE_FLAG_STACKABLE) | \
(1 << QUEUE_FLAG_SAME_COMP) | \
(1 << QUEUE_FLAG_POLL))
@@ -722,8 +719,6 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
-#define blk_queue_stackable(q) \
- test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
#define blk_queue_secure_erase(q) \
(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
--
2.14.1
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