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nvme: only reconfigure discard if necessary 

Currently nvme reconfigures discard for every disk revalidation. This
is problematic because any O_WRONLY or O_RDWR open will trigger a
partition scan through udev/systemd, and we will reconfigure discard.
This blows away any user settings, like discard_max_bytes.

Only re-configure the user settable settings if we need to.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
[removed redundant queue flag setting]
Signed-off-by: Keith Busch <keith.busch@intel.com>
hifive-unleashed-5.1
Jens Axboe 2018-05-02 11:06:54 -06:00 committed by Keith Busch
parent 1811977568
commit 3831761eb8
1 changed files with 16 additions and 12 deletions
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28
drivers/nvme/host/core.c
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@ -1347,13 +1347,19 @@ static void nvme_set_chunk_size(struct nvme_ns *ns)
blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
}
static void nvme_config_discard(struct nvme_ctrl *ctrl,
unsigned stream_alignment, struct request_queue *queue)
static void nvme_config_discard(struct nvme_ns *ns)
{
struct nvme_ctrl *ctrl = ns->ctrl;
struct request_queue *queue = ns->queue;
u32 size = queue_logical_block_size(queue);
if (stream_alignment)
size *= stream_alignment;
if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
return;
}
if (ctrl->nr_streams && ns->sws && ns->sgs)
size *= ns->sws * ns->sgs;
BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
NVME_DSM_MAX_RANGES);
@ -1361,9 +1367,12 @@ static void nvme_config_discard(struct nvme_ctrl *ctrl,
queue->limits.discard_alignment = 0;
queue->limits.discard_granularity = size;
/* If discard is already enabled, don't reset queue limits */
if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
return;
blk_queue_max_discard_sectors(queue, UINT_MAX);
blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, queue);
if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
@ -1407,10 +1416,6 @@ static void nvme_update_disk_info(struct gendisk *disk,
{
sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
unsigned short bs = 1 << ns->lba_shift;
unsigned stream_alignment = 0;
if (ns->ctrl->nr_streams && ns->sws && ns->sgs)
stream_alignment = ns->sws * ns->sgs;
blk_mq_freeze_queue(disk->queue);
blk_integrity_unregister(disk);
@ -1424,10 +1429,9 @@ static void nvme_update_disk_info(struct gendisk *disk,
nvme_init_integrity(disk, ns->ms, ns->pi_type);
if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
capacity = 0;
set_capacity(disk, capacity);
if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
nvme_config_discard(ns->ctrl, stream_alignment, disk->queue);
set_capacity(disk, capacity);
nvme_config_discard(ns);
blk_mq_unfreeze_queue(disk->queue);
}