[PATCH 11/26] block: freeze the queue in queue_attr_store
From: Christoph Hellwig <hch@lst.de>
Date: 2024-06-11 05:20:19
Also in:
ceph-devel, dm-devel, linux-bcache, linux-block, linux-m68k, linux-mmc, linux-nvme, linux-s390, linux-scsi, linux-um, linuxppc-dev, nvdimm, virtualization, xen-devel
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
queue_attr_store updates attributes used to control generating I/O, and can cause malformed bios if changed with I/O in flight. Freeze the queue in common code instead of adding it to almost every attribute. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/blk-mq.c | 5 +++-- block/blk-sysfs.c | 9 ++------- 2 files changed, 5 insertions(+), 9 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0d4cd39c3d25da..58b0d6c7cc34d6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c@@ -4631,13 +4631,15 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) int ret; unsigned long i; + if (WARN_ON_ONCE(!q->mq_freeze_depth)) + return -EINVAL; + if (!set) return -EINVAL; if (q->nr_requests == nr) return 0; - blk_mq_freeze_queue(q); blk_mq_quiesce_queue(q); ret = 0;
@@ -4671,7 +4673,6 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) } blk_mq_unquiesce_queue(q); - blk_mq_unfreeze_queue(q); return ret; }
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f0f9314ab65c61..5c787965b7d09e 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c@@ -189,12 +189,9 @@ static ssize_t queue_discard_max_store(struct request_queue *q, if ((max_discard_bytes >> SECTOR_SHIFT) > UINT_MAX) return -EINVAL; - blk_mq_freeze_queue(q); lim = queue_limits_start_update(q); lim.max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT; err = queue_limits_commit_update(q, &lim); - blk_mq_unfreeze_queue(q); - if (err) return err; return ret;
@@ -241,11 +238,9 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) if (ret < 0) return ret; - blk_mq_freeze_queue(q); lim = queue_limits_start_update(q); lim.max_user_sectors = max_sectors_kb << 1; err = queue_limits_commit_update(q, &lim); - blk_mq_unfreeze_queue(q); if (err) return err; return ret;
@@ -585,13 +580,11 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, * ends up either enabling or disabling wbt completely. We can't * have IO inflight if that happens. */ - blk_mq_freeze_queue(q); blk_mq_quiesce_queue(q); wbt_set_min_lat(q, val); blk_mq_unquiesce_queue(q); - blk_mq_unfreeze_queue(q); return count; }
@@ -722,9 +715,11 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr, if (!entry->store) return -EIO; + blk_mq_freeze_queue(q); mutex_lock(&q->sysfs_lock); res = entry->store(q, page, length); mutex_unlock(&q->sysfs_lock); + blk_mq_unfreeze_queue(q); return res; }
--
2.43.0