* [PATCH] block: force noio scope in blk_mq_freeze_queue
2025-01-31 12:03 annotate noio context v2 Christoph Hellwig
@ 2025-01-31 12:03 ` Christoph Hellwig
2025-01-31 15:13 ` Jens Axboe
2025-02-03 15:09 ` Guenter Roeck
0 siblings, 2 replies; 5+ messages in thread
From: Christoph Hellwig @ 2025-01-31 12:03 UTC (permalink / raw)
To: Jens Axboe
Cc: Ming Lei, linux-block, nbd, ceph-devel, virtualization, linux-mtd,
linux-nvme, linux-scsi
When block drivers or the core block code perform allocations with a
frozen queue, this could try to recurse into the block device to
reclaim memory and deadlock. Thus all allocations done by a process
that froze a queue need to be done without __GFP_IO and __GFP_FS.
Instead of tying to track all of them down, force a noio scope as
part of freezing the queue.
Note that nvme is a bit of a mess here due to the non-owner freezes,
and they will be addressed separately.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-cgroup.c | 10 ++++++----
block/blk-iocost.c | 14 ++++++++------
block/blk-iolatency.c | 6 ++++--
block/blk-mq.c | 21 +++++++++++++--------
block/blk-pm.c | 2 +-
block/blk-rq-qos.c | 12 +++++++-----
block/blk-settings.c | 5 +++--
block/blk-sysfs.c | 8 +++-----
block/blk-throttle.c | 5 +++--
block/blk-zoned.c | 5 +++--
block/elevator.c | 16 ++++++++++------
drivers/block/aoe/aoedev.c | 5 +++--
drivers/block/ataflop.c | 5 +++--
drivers/block/loop.c | 20 ++++++++++++--------
drivers/block/nbd.c | 7 ++++---
drivers/block/rbd.c | 5 +++--
drivers/block/sunvdc.c | 5 +++--
drivers/block/swim3.c | 5 +++--
drivers/block/virtio_blk.c | 5 +++--
drivers/mtd/mtd_blkdevs.c | 5 +++--
drivers/nvme/host/core.c | 17 ++++++++++-------
drivers/nvme/host/multipath.c | 2 +-
drivers/scsi/scsi_lib.c | 5 +++--
drivers/scsi/scsi_scan.c | 5 +++--
drivers/ufs/core/ufs-sysfs.c | 7 +++++--
include/linux/blk-mq.h | 18 ++++++++++++++++--
26 files changed, 136 insertions(+), 84 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f1cf7f2909f3..9ed93d91d754 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1546,6 +1546,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
struct request_queue *q = disk->queue;
struct blkg_policy_data *pd_prealloc = NULL;
struct blkcg_gq *blkg, *pinned_blkg = NULL;
+ unsigned int memflags;
int ret;
if (blkcg_policy_enabled(q, pol))
@@ -1560,7 +1561,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
return -EINVAL;
if (queue_is_mq(q))
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
retry:
spin_lock_irq(&q->queue_lock);
@@ -1624,7 +1625,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
spin_unlock_irq(&q->queue_lock);
out:
if (queue_is_mq(q))
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
if (pinned_blkg)
blkg_put(pinned_blkg);
if (pd_prealloc)
@@ -1668,12 +1669,13 @@ void blkcg_deactivate_policy(struct gendisk *disk,
{
struct request_queue *q = disk->queue;
struct blkcg_gq *blkg;
+ unsigned int memflags;
if (!blkcg_policy_enabled(q, pol))
return;
if (queue_is_mq(q))
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
mutex_lock(&q->blkcg_mutex);
spin_lock_irq(&q->queue_lock);
@@ -1697,7 +1699,7 @@ void blkcg_deactivate_policy(struct gendisk *disk,
mutex_unlock(&q->blkcg_mutex);
if (queue_is_mq(q))
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
}
EXPORT_SYMBOL_GPL(blkcg_deactivate_policy);
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index a5894ec9696e..65a1d4427ccf 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3224,6 +3224,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
u32 qos[NR_QOS_PARAMS];
bool enable, user;
char *body, *p;
+ unsigned int memflags;
int ret;
blkg_conf_init(&ctx, input);
@@ -3247,7 +3248,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
ioc = q_to_ioc(disk->queue);
}
- blk_mq_freeze_queue(disk->queue);
+ memflags = blk_mq_freeze_queue(disk->queue);
blk_mq_quiesce_queue(disk->queue);
spin_lock_irq(&ioc->lock);
@@ -3347,7 +3348,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
wbt_enable_default(disk);
blk_mq_unquiesce_queue(disk->queue);
- blk_mq_unfreeze_queue(disk->queue);
+ blk_mq_unfreeze_queue(disk->queue, memflags);
blkg_conf_exit(&ctx);
return nbytes;
@@ -3355,7 +3356,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
spin_unlock_irq(&ioc->lock);
blk_mq_unquiesce_queue(disk->queue);
- blk_mq_unfreeze_queue(disk->queue);
+ blk_mq_unfreeze_queue(disk->queue, memflags);
ret = -EINVAL;
err:
@@ -3414,6 +3415,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
{
struct blkg_conf_ctx ctx;
struct request_queue *q;
+ unsigned int memflags;
struct ioc *ioc;
u64 u[NR_I_LCOEFS];
bool user;
@@ -3441,7 +3443,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
ioc = q_to_ioc(q);
}
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
spin_lock_irq(&ioc->lock);
@@ -3493,7 +3495,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
spin_unlock_irq(&ioc->lock);
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
blkg_conf_exit(&ctx);
return nbytes;
@@ -3502,7 +3504,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
spin_unlock_irq(&ioc->lock);
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
ret = -EINVAL;
err:
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index ebb522788d97..42c1e0b9a68f 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -749,9 +749,11 @@ static void blkiolatency_enable_work_fn(struct work_struct *work)
*/
enabled = atomic_read(&blkiolat->enable_cnt);
if (enabled != blkiolat->enabled) {
- blk_mq_freeze_queue(blkiolat->rqos.disk->queue);
+ unsigned int memflags;
+
+ memflags = blk_mq_freeze_queue(blkiolat->rqos.disk->queue);
blkiolat->enabled = enabled;
- blk_mq_unfreeze_queue(blkiolat->rqos.disk->queue);
+ blk_mq_unfreeze_queue(blkiolat->rqos.disk->queue, memflags);
}
}
diff --git a/block/blk-mq.c b/block/blk-mq.c
index da39a1cac702..40490ac88045 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -210,12 +210,12 @@ int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
}
EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait_timeout);
-void blk_mq_freeze_queue(struct request_queue *q)
+void blk_mq_freeze_queue_nomemsave(struct request_queue *q)
{
blk_freeze_queue_start(q);
blk_mq_freeze_queue_wait(q);
}
-EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
+EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_nomemsave);
bool __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic)
{
@@ -236,12 +236,12 @@ bool __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic)
return unfreeze;
}
-void blk_mq_unfreeze_queue(struct request_queue *q)
+void blk_mq_unfreeze_queue_nomemrestore(struct request_queue *q)
{
if (__blk_mq_unfreeze_queue(q, false))
blk_unfreeze_release_lock(q);
}
-EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
+EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue_nomemrestore);
/*
* non_owner variant of blk_freeze_queue_start
@@ -4223,13 +4223,14 @@ static void blk_mq_update_tag_set_shared(struct blk_mq_tag_set *set,
bool shared)
{
struct request_queue *q;
+ unsigned int memflags;
lockdep_assert_held(&set->tag_list_lock);
list_for_each_entry(q, &set->tag_list, tag_set_list) {
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
queue_set_hctx_shared(q, shared);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
}
}
@@ -4992,6 +4993,7 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
struct request_queue *q;
LIST_HEAD(head);
int prev_nr_hw_queues = set->nr_hw_queues;
+ unsigned int memflags;
int i;
lockdep_assert_held(&set->tag_list_lock);
@@ -5003,8 +5005,10 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
if (set->nr_maps == 1 && nr_hw_queues == set->nr_hw_queues)
return;
+ memflags = memalloc_noio_save();
list_for_each_entry(q, &set->tag_list, tag_set_list)
- blk_mq_freeze_queue(q);
+ blk_mq_freeze_queue_nomemsave(q);
+
/*
* Switch IO scheduler to 'none', cleaning up the data associated
* with the previous scheduler. We will switch back once we are done
@@ -5052,7 +5056,8 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
blk_mq_elv_switch_back(&head, q);
list_for_each_entry(q, &set->tag_list, tag_set_list)
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue_nomemrestore(q);
+ memalloc_noio_restore(memflags);
/* Free the excess tags when nr_hw_queues shrink. */
for (i = set->nr_hw_queues; i < prev_nr_hw_queues; i++)
diff --git a/block/blk-pm.c b/block/blk-pm.c
index 42e842074715..8d3e052f91da 100644
--- a/block/blk-pm.c
+++ b/block/blk-pm.c
@@ -89,7 +89,7 @@ int blk_pre_runtime_suspend(struct request_queue *q)
if (percpu_ref_is_zero(&q->q_usage_counter))
ret = 0;
/* Switch q_usage_counter back to per-cpu mode. */
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue_nomemrestore(q);
if (ret < 0) {
spin_lock_irq(&q->queue_lock);
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index eb9618cd68ad..d4d4f4dc0e23 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -299,6 +299,7 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
const struct rq_qos_ops *ops)
{
struct request_queue *q = disk->queue;
+ unsigned int memflags;
lockdep_assert_held(&q->rq_qos_mutex);
@@ -310,14 +311,14 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
* No IO can be in-flight when adding rqos, so freeze queue, which
* is fine since we only support rq_qos for blk-mq queue.
*/
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
if (rq_qos_id(q, rqos->id))
goto ebusy;
rqos->next = q->rq_qos;
q->rq_qos = rqos;
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
if (rqos->ops->debugfs_attrs) {
mutex_lock(&q->debugfs_mutex);
@@ -327,7 +328,7 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
return 0;
ebusy:
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
return -EBUSY;
}
@@ -335,17 +336,18 @@ void rq_qos_del(struct rq_qos *rqos)
{
struct request_queue *q = rqos->disk->queue;
struct rq_qos **cur;
+ unsigned int memflags;
lockdep_assert_held(&q->rq_qos_mutex);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) {
if (*cur == rqos) {
*cur = rqos->next;
break;
}
}
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
mutex_lock(&q->debugfs_mutex);
blk_mq_debugfs_unregister_rqos(rqos);
diff --git a/block/blk-settings.c b/block/blk-settings.c
index db12396ff5c7..c44dadc35e1e 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -461,11 +461,12 @@ EXPORT_SYMBOL_GPL(queue_limits_commit_update);
int queue_limits_commit_update_frozen(struct request_queue *q,
struct queue_limits *lim)
{
+ unsigned int memflags;
int ret;
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
ret = queue_limits_commit_update(q, lim);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
return ret;
}
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e09b455874bf..368c2f6f5c85 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -681,7 +681,7 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
struct queue_sysfs_entry *entry = to_queue(attr);
struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
struct request_queue *q = disk->queue;
- unsigned int noio_flag;
+ unsigned int memflags;
ssize_t res;
if (!entry->store_limit && !entry->store)
@@ -711,11 +711,9 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
}
mutex_lock(&q->sysfs_lock);
- blk_mq_freeze_queue(q);
- noio_flag = memalloc_noio_save();
+ memflags = blk_mq_freeze_queue(q);
res = entry->store(disk, page, length);
- memalloc_noio_restore(noio_flag);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
mutex_unlock(&q->sysfs_lock);
return res;
}
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 82dbaefcfa3b..8d149aff9fd0 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1202,6 +1202,7 @@ static int blk_throtl_init(struct gendisk *disk)
{
struct request_queue *q = disk->queue;
struct throtl_data *td;
+ unsigned int memflags;
int ret;
td = kzalloc_node(sizeof(*td), GFP_KERNEL, q->node);
@@ -1215,7 +1216,7 @@ static int blk_throtl_init(struct gendisk *disk)
* Freeze queue before activating policy, to synchronize with IO path,
* which is protected by 'q_usage_counter'.
*/
- blk_mq_freeze_queue(disk->queue);
+ memflags = blk_mq_freeze_queue(disk->queue);
blk_mq_quiesce_queue(disk->queue);
q->td = td;
@@ -1239,7 +1240,7 @@ static int blk_throtl_init(struct gendisk *disk)
out:
blk_mq_unquiesce_queue(disk->queue);
- blk_mq_unfreeze_queue(disk->queue);
+ blk_mq_unfreeze_queue(disk->queue, memflags);
return ret;
}
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 9d08a54c201e..761ea662ddc3 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -1717,9 +1717,10 @@ int blk_revalidate_disk_zones(struct gendisk *disk)
else
pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
if (ret) {
- blk_mq_freeze_queue(q);
+ unsigned int memflags = blk_mq_freeze_queue(q);
+
disk_free_zone_resources(disk);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
}
return ret;
diff --git a/block/elevator.c b/block/elevator.c
index b81216c48b6b..cd2ce4921601 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -570,6 +570,7 @@ static struct elevator_type *elevator_get_default(struct request_queue *q)
void elevator_init_mq(struct request_queue *q)
{
struct elevator_type *e;
+ unsigned int memflags;
int err;
WARN_ON_ONCE(blk_queue_registered(q));
@@ -590,13 +591,13 @@ void elevator_init_mq(struct request_queue *q)
*
* Disk isn't added yet, so verifying queue lock only manually.
*/
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_cancel_work_sync(q);
err = blk_mq_init_sched(q, e);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
if (err) {
pr_warn("\"%s\" elevator initialization failed, "
@@ -614,11 +615,12 @@ void elevator_init_mq(struct request_queue *q)
*/
int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
{
+ unsigned int memflags;
int ret;
lockdep_assert_held(&q->sysfs_lock);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
if (q->elevator) {
@@ -639,7 +641,7 @@ int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
out_unfreeze:
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
if (ret) {
pr_warn("elv: switch to \"%s\" failed, falling back to \"none\"\n",
@@ -651,9 +653,11 @@ int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
void elevator_disable(struct request_queue *q)
{
+ unsigned int memflags;
+
lockdep_assert_held(&q->sysfs_lock);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
elv_unregister_queue(q);
@@ -664,7 +668,7 @@ void elevator_disable(struct request_queue *q)
blk_add_trace_msg(q, "elv switch: none");
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
}
/*
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 3523dd82d7a0..4db7f6ce8ade 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -226,10 +226,11 @@ aoedev_downdev(struct aoedev *d)
/* fast fail all pending I/O */
if (d->blkq) {
/* UP is cleared, freeze+quiesce to insure all are errored */
- blk_mq_freeze_queue(d->blkq);
+ unsigned int memflags = blk_mq_freeze_queue(d->blkq);
+
blk_mq_quiesce_queue(d->blkq);
blk_mq_unquiesce_queue(d->blkq);
- blk_mq_unfreeze_queue(d->blkq);
+ blk_mq_unfreeze_queue(d->blkq, memflags);
}
if (d->gd)
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 110f9aca2667..a81ade622a01 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -746,6 +746,7 @@ static int do_format(int drive, int type, struct atari_format_descr *desc)
unsigned char *p;
int sect, nsect;
unsigned long flags;
+ unsigned int memflags;
int ret;
if (type) {
@@ -758,7 +759,7 @@ static int do_format(int drive, int type, struct atari_format_descr *desc)
}
q = unit[drive].disk[type]->queue;
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
local_irq_save(flags);
@@ -817,7 +818,7 @@ static int do_format(int drive, int type, struct atari_format_descr *desc)
ret = FormatError ? -EIO : 0;
out:
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
return ret;
}
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 89352a85b704..94edc28dba5a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -603,6 +603,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
{
struct file *file = fget(arg);
struct file *old_file;
+ unsigned int memflags;
int error;
bool partscan;
bool is_loop;
@@ -640,11 +641,11 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
/* and ... switch */
disk_force_media_change(lo->lo_disk);
- blk_mq_freeze_queue(lo->lo_queue);
+ memflags = blk_mq_freeze_queue(lo->lo_queue);
mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask);
loop_assign_backing_file(lo, file);
loop_update_dio(lo);
- blk_mq_unfreeze_queue(lo->lo_queue);
+ blk_mq_unfreeze_queue(lo->lo_queue, memflags);
partscan = lo->lo_flags & LO_FLAGS_PARTSCAN;
loop_global_unlock(lo, is_loop);
@@ -1263,6 +1264,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
int err;
bool partscan = false;
bool size_changed = false;
+ unsigned int memflags;
err = mutex_lock_killable(&lo->lo_mutex);
if (err)
@@ -1280,7 +1282,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
}
/* I/O needs to be drained before changing lo_offset or lo_sizelimit */
- blk_mq_freeze_queue(lo->lo_queue);
+ memflags = blk_mq_freeze_queue(lo->lo_queue);
err = loop_set_status_from_info(lo, info);
if (err)
@@ -1303,7 +1305,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
loop_update_dio(lo);
out_unfreeze:
- blk_mq_unfreeze_queue(lo->lo_queue);
+ blk_mq_unfreeze_queue(lo->lo_queue, memflags);
if (partscan)
clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state);
out_unlock:
@@ -1455,6 +1457,7 @@ static int loop_set_capacity(struct loop_device *lo)
static int loop_set_dio(struct loop_device *lo, unsigned long arg)
{
bool use_dio = !!arg;
+ unsigned int memflags;
if (lo->lo_state != Lo_bound)
return -ENXIO;
@@ -1468,18 +1471,19 @@ static int loop_set_dio(struct loop_device *lo, unsigned long arg)
vfs_fsync(lo->lo_backing_file, 0);
}
- blk_mq_freeze_queue(lo->lo_queue);
+ memflags = blk_mq_freeze_queue(lo->lo_queue);
if (use_dio)
lo->lo_flags |= LO_FLAGS_DIRECT_IO;
else
lo->lo_flags &= ~LO_FLAGS_DIRECT_IO;
- blk_mq_unfreeze_queue(lo->lo_queue);
+ blk_mq_unfreeze_queue(lo->lo_queue, memflags);
return 0;
}
static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
{
struct queue_limits lim;
+ unsigned int memflags;
int err = 0;
if (lo->lo_state != Lo_bound)
@@ -1494,10 +1498,10 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
lim = queue_limits_start_update(lo->lo_queue);
loop_update_limits(lo, &lim, arg);
- blk_mq_freeze_queue(lo->lo_queue);
+ memflags = blk_mq_freeze_queue(lo->lo_queue);
err = queue_limits_commit_update(lo->lo_queue, &lim);
loop_update_dio(lo);
- blk_mq_unfreeze_queue(lo->lo_queue);
+ blk_mq_unfreeze_queue(lo->lo_queue, memflags);
return err;
}
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index b63a0f29a54a..7bdc7eb808ea 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1234,6 +1234,7 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
struct socket *sock;
struct nbd_sock **socks;
struct nbd_sock *nsock;
+ unsigned int memflags;
int err;
/* Arg will be cast to int, check it to avoid overflow */
@@ -1247,7 +1248,7 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
* We need to make sure we don't get any errant requests while we're
* reallocating the ->socks array.
*/
- blk_mq_freeze_queue(nbd->disk->queue);
+ memflags = blk_mq_freeze_queue(nbd->disk->queue);
if (!netlink && !nbd->task_setup &&
!test_bit(NBD_RT_BOUND, &config->runtime_flags))
@@ -1288,12 +1289,12 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
INIT_WORK(&nsock->work, nbd_pending_cmd_work);
socks[config->num_connections++] = nsock;
atomic_inc(&config->live_connections);
- blk_mq_unfreeze_queue(nbd->disk->queue);
+ blk_mq_unfreeze_queue(nbd->disk->queue, memflags);
return 0;
put_socket:
- blk_mq_unfreeze_queue(nbd->disk->queue);
+ blk_mq_unfreeze_queue(nbd->disk->queue, memflags);
sockfd_put(sock);
return err;
}
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 5b393e4a1ddf..faafd7ff43d6 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -7281,9 +7281,10 @@ static ssize_t do_rbd_remove(const char *buf, size_t count)
* Prevent new IO from being queued and wait for existing
* IO to complete/fail.
*/
- blk_mq_freeze_queue(rbd_dev->disk->queue);
+ unsigned int memflags = blk_mq_freeze_queue(rbd_dev->disk->queue);
+
blk_mark_disk_dead(rbd_dev->disk);
- blk_mq_unfreeze_queue(rbd_dev->disk->queue);
+ blk_mq_unfreeze_queue(rbd_dev->disk->queue, memflags);
}
del_gendisk(rbd_dev->disk);
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index e4d1e7284dae..33b3bc99d532 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -1113,6 +1113,7 @@ static void vdc_requeue_inflight(struct vdc_port *port)
static void vdc_queue_drain(struct vdc_port *port)
{
struct request_queue *q = port->disk->queue;
+ unsigned int memflags;
/*
* Mark the queue as draining, then freeze/quiesce to ensure
@@ -1121,12 +1122,12 @@ static void vdc_queue_drain(struct vdc_port *port)
port->drain = 1;
spin_unlock_irq(&port->vio.lock);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
spin_lock_irq(&port->vio.lock);
port->drain = 0;
- blk_mq_unquiesce_queue(q);
+ blk_mq_unquiesce_queue(q, memflags);
blk_mq_unfreeze_queue(q);
}
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 9914153b365b..3aedcb5add61 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -840,6 +840,7 @@ static int grab_drive(struct floppy_state *fs, enum swim_state state,
static void release_drive(struct floppy_state *fs)
{
struct request_queue *q = disks[fs->index]->queue;
+ unsigned int memflags;
unsigned long flags;
swim3_dbg("%s", "-> release drive\n");
@@ -848,10 +849,10 @@ static void release_drive(struct floppy_state *fs)
fs->state = idle;
spin_unlock_irqrestore(&swim3_lock, flags);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue(q);
blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
}
static int fd_eject(struct floppy_state *fs)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index bfbe391c20fe..6a61ec35f426 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -1583,11 +1583,12 @@ static int virtblk_freeze_priv(struct virtio_device *vdev)
{
struct virtio_blk *vblk = vdev->priv;
struct request_queue *q = vblk->disk->queue;
+ unsigned int memflags;
/* Ensure no requests in virtqueues before deleting vqs. */
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
blk_mq_quiesce_queue_nowait(q);
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
/* Ensure we don't receive any more interrupts */
virtio_reset_device(vdev);
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index ee7e1d908986..847c11542f02 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -404,6 +404,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
{
unsigned long flags;
+ unsigned int memflags;
lockdep_assert_held(&mtd_table_mutex);
@@ -420,10 +421,10 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
spin_unlock_irqrestore(&old->queue_lock, flags);
/* freeze+quiesce queue to ensure all requests are flushed */
- blk_mq_freeze_queue(old->rq);
+ memflags = blk_mq_freeze_queue(old->rq);
blk_mq_quiesce_queue(old->rq);
blk_mq_unquiesce_queue(old->rq);
- blk_mq_unfreeze_queue(old->rq);
+ blk_mq_unfreeze_queue(old->rq, memflags);
/* If the device is currently open, tell trans driver to close it,
then put mtd device, and don't touch it again */
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 76b615d4d5b9..40046770f1bf 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2132,15 +2132,16 @@ static int nvme_update_ns_info_generic(struct nvme_ns *ns,
struct nvme_ns_info *info)
{
struct queue_limits lim;
+ unsigned int memflags;
int ret;
lim = queue_limits_start_update(ns->disk->queue);
nvme_set_ctrl_limits(ns->ctrl, &lim);
- blk_mq_freeze_queue(ns->disk->queue);
+ memflags = blk_mq_freeze_queue(ns->disk->queue);
ret = queue_limits_commit_update(ns->disk->queue, &lim);
set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
- blk_mq_unfreeze_queue(ns->disk->queue);
+ blk_mq_unfreeze_queue(ns->disk->queue, memflags);
/* Hide the block-interface for these devices */
if (!ret)
@@ -2155,6 +2156,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
struct nvme_id_ns_nvm *nvm = NULL;
struct nvme_zone_info zi = {};
struct nvme_id_ns *id;
+ unsigned int memflags;
sector_t capacity;
unsigned lbaf;
int ret;
@@ -2186,7 +2188,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
lim = queue_limits_start_update(ns->disk->queue);
- blk_mq_freeze_queue(ns->disk->queue);
+ memflags = blk_mq_freeze_queue(ns->disk->queue);
ns->head->lba_shift = id->lbaf[lbaf].ds;
ns->head->nuse = le64_to_cpu(id->nuse);
capacity = nvme_lba_to_sect(ns->head, le64_to_cpu(id->nsze));
@@ -2219,7 +2221,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
ret = queue_limits_commit_update(ns->disk->queue, &lim);
if (ret) {
- blk_mq_unfreeze_queue(ns->disk->queue);
+ blk_mq_unfreeze_queue(ns->disk->queue, memflags);
goto out;
}
@@ -2235,7 +2237,7 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
ns->head->features |= NVME_NS_DEAC;
set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
set_bit(NVME_NS_READY, &ns->flags);
- blk_mq_unfreeze_queue(ns->disk->queue);
+ blk_mq_unfreeze_queue(ns->disk->queue, memflags);
if (blk_queue_is_zoned(ns->queue)) {
ret = blk_revalidate_disk_zones(ns->disk);
@@ -2291,9 +2293,10 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
if (!ret && nvme_ns_head_multipath(ns->head)) {
struct queue_limits *ns_lim = &ns->disk->queue->limits;
struct queue_limits lim;
+ unsigned int memflags;
lim = queue_limits_start_update(ns->head->disk->queue);
- blk_mq_freeze_queue(ns->head->disk->queue);
+ memflags = blk_mq_freeze_queue(ns->head->disk->queue);
/*
* queue_limits mixes values that are the hardware limitations
* for bio splitting with what is the device configuration.
@@ -2325,7 +2328,7 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
nvme_mpath_revalidate_paths(ns);
- blk_mq_unfreeze_queue(ns->head->disk->queue);
+ blk_mq_unfreeze_queue(ns->head->disk->queue, memflags);
}
return ret;
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index a85d190942bd..2a7635565083 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -60,7 +60,7 @@ void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
lockdep_assert_held(&subsys->lock);
list_for_each_entry(h, &subsys->nsheads, entry)
if (h->disk)
- blk_mq_unfreeze_queue(h->disk->queue);
+ blk_mq_unfreeze_queue_nomemrestore(h->disk->queue);
}
void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index e7ea1f04164a..d776f13cd160 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2736,6 +2736,7 @@ int
scsi_device_quiesce(struct scsi_device *sdev)
{
struct request_queue *q = sdev->request_queue;
+ unsigned int memflags;
int err;
/*
@@ -2750,7 +2751,7 @@ scsi_device_quiesce(struct scsi_device *sdev)
blk_set_pm_only(q);
- blk_mq_freeze_queue(q);
+ memflags = blk_mq_freeze_queue(q);
/*
* Ensure that the effect of blk_set_pm_only() will be visible
* for percpu_ref_tryget() callers that occur after the queue
@@ -2758,7 +2759,7 @@ scsi_device_quiesce(struct scsi_device *sdev)
* was called. See also https://lwn.net/Articles/573497/.
*/
synchronize_rcu();
- blk_mq_unfreeze_queue(q);
+ blk_mq_unfreeze_queue(q, memflags);
mutex_lock(&sdev->state_mutex);
err = scsi_device_set_state(sdev, SDEV_QUIESCE);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f2093982b3db..087fcbfc9aaa 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -220,6 +220,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
int new_shift = sbitmap_calculate_shift(depth);
bool need_alloc = !sdev->budget_map.map;
bool need_free = false;
+ unsigned int memflags;
int ret;
struct sbitmap sb_backup;
@@ -240,7 +241,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
* and here disk isn't added yet, so freezing is pretty fast
*/
if (need_free) {
- blk_mq_freeze_queue(sdev->request_queue);
+ memflags = blk_mq_freeze_queue(sdev->request_queue);
sb_backup = sdev->budget_map;
}
ret = sbitmap_init_node(&sdev->budget_map,
@@ -256,7 +257,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
else
sbitmap_free(&sb_backup);
ret = 0;
- blk_mq_unfreeze_queue(sdev->request_queue);
+ blk_mq_unfreeze_queue(sdev->request_queue, memflags);
}
return ret;
}
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index 796e37a1d859..3438269a5440 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -1439,6 +1439,7 @@ static ssize_t max_number_of_rtt_store(struct device *dev,
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_dev_info *dev_info = &hba->dev_info;
struct scsi_device *sdev;
+ unsigned int memflags;
unsigned int rtt;
int ret;
@@ -1458,14 +1459,16 @@ static ssize_t max_number_of_rtt_store(struct device *dev,
ufshcd_rpm_get_sync(hba);
+ memflags = memalloc_noio_save();
shost_for_each_device(sdev, hba->host)
- blk_mq_freeze_queue(sdev->request_queue);
+ blk_mq_freeze_queue_nomemsave(sdev->request_queue);
ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
QUERY_ATTR_IDN_MAX_NUM_OF_RTT, 0, 0, &rtt);
shost_for_each_device(sdev, hba->host)
- blk_mq_unfreeze_queue(sdev->request_queue);
+ blk_mq_unfreeze_queue_nomemrestore(sdev->request_queue);
+ memalloc_noio_restore(memflags);
ufshcd_rpm_put_sync(hba);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a0a9007cc1e3..9ebb53f031cd 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -900,8 +900,22 @@ void blk_mq_delay_run_hw_queues(struct request_queue *q, unsigned long msecs);
void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
busy_tag_iter_fn *fn, void *priv);
void blk_mq_tagset_wait_completed_request(struct blk_mq_tag_set *tagset);
-void blk_mq_freeze_queue(struct request_queue *q);
-void blk_mq_unfreeze_queue(struct request_queue *q);
+void blk_mq_freeze_queue_nomemsave(struct request_queue *q);
+void blk_mq_unfreeze_queue_nomemrestore(struct request_queue *q);
+static inline unsigned int __must_check
+blk_mq_freeze_queue(struct request_queue *q)
+{
+ unsigned int memflags = memalloc_noio_save();
+
+ blk_mq_freeze_queue_nomemsave(q);
+ return memflags;
+}
+static inline void
+blk_mq_unfreeze_queue(struct request_queue *q, unsigned int memflags)
+{
+ blk_mq_unfreeze_queue_nomemrestore(q);
+ memalloc_noio_restore(memflags);
+}
void blk_freeze_queue_start(struct request_queue *q);
void blk_mq_freeze_queue_wait(struct request_queue *q);
int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
--
2.45.2
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