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authorLinus Torvalds <torvalds@linux-foundation.org>2019-10-11 08:45:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-11 08:45:32 -0700
commit297cbcccc23d4eefbc3043cd2fa5cf577930e695 (patch)
treef7a588aed5b207124773ba4e5843612bf38bd51d
parent9e208aa06c2109b45eec6be049a8e47034748c20 (diff)
parent862488105b84ca744b3d8ff131e0fcfe10644be1 (diff)
downloadlinux-sh-297cbcccc23d4eefbc3043cd2fa5cf577930e695.tar.gz
Merge tag 'for-linus-20191010' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: - Fix wbt performance regression introduced with the blk-rq-qos refactoring (Harshad) - Fix io_uring fileset removal inadvertently killing the workqueue (me) - Fix io_uring typo in linked command nonblock submission (Pavel) - Remove spurious io_uring wakeups on request free (Pavel) - Fix null_blk zoned command error return (Keith) - Don't use freezable workqueues for backing_dev, also means we can revert a previous libata hack (Mika) - Fix nbd sysfs mutex dropped too soon at removal time (Xiubo) * tag 'for-linus-20191010' of git://git.kernel.dk/linux-block: nbd: fix possible sysfs duplicate warning null_blk: Fix zoned command return code io_uring: only flush workqueues on fileset removal io_uring: remove wait loop spurious wakeups blk-wbt: fix performance regression in wbt scale_up/scale_down Revert "libata, freezer: avoid block device removal while system is frozen" bdi: Do not use freezable workqueue io_uring: fix reversed nonblock flag for link submission
-rw-r--r--block/blk-rq-qos.c14
-rw-r--r--block/blk-rq-qos.h4
-rw-r--r--block/blk-wbt.c6
-rw-r--r--drivers/ata/libata-scsi.c21
-rw-r--r--drivers/block/nbd.c2
-rw-r--r--drivers/block/null_blk_zoned.c3
-rw-r--r--fs/io_uring.c24
-rw-r--r--kernel/freezer.c6
-rw-r--r--mm/backing-dev.c4
9 files changed, 29 insertions, 55 deletions
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index 61b635bc2a31..656460636ad3 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -160,24 +160,27 @@ bool rq_depth_calc_max_depth(struct rq_depth *rqd)
return ret;
}
-void rq_depth_scale_up(struct rq_depth *rqd)
+/* Returns true on success and false if scaling up wasn't possible */
+bool rq_depth_scale_up(struct rq_depth *rqd)
{
/*
* Hit max in previous round, stop here
*/
if (rqd->scaled_max)
- return;
+ return false;
rqd->scale_step--;
rqd->scaled_max = rq_depth_calc_max_depth(rqd);
+ return true;
}
/*
* Scale rwb down. If 'hard_throttle' is set, do it quicker, since we
- * had a latency violation.
+ * had a latency violation. Returns true on success and returns false if
+ * scaling down wasn't possible.
*/
-void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
+bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
{
/*
* Stop scaling down when we've hit the limit. This also prevents
@@ -185,7 +188,7 @@ void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
* keep up.
*/
if (rqd->max_depth == 1)
- return;
+ return false;
if (rqd->scale_step < 0 && hard_throttle)
rqd->scale_step = 0;
@@ -194,6 +197,7 @@ void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
rqd->scaled_max = false;
rq_depth_calc_max_depth(rqd);
+ return true;
}
struct rq_qos_wait_data {
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 08a09dbe0f4b..e8cb68f6958a 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -130,8 +130,8 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
acquire_inflight_cb_t *acquire_inflight_cb,
cleanup_cb_t *cleanup_cb);
bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit);
-void rq_depth_scale_up(struct rq_depth *rqd);
-void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
+bool rq_depth_scale_up(struct rq_depth *rqd);
+bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
bool rq_depth_calc_max_depth(struct rq_depth *rqd);
void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 8af553a0ba00..8641ba9793c5 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -308,7 +308,8 @@ static void calc_wb_limits(struct rq_wb *rwb)
static void scale_up(struct rq_wb *rwb)
{
- rq_depth_scale_up(&rwb->rq_depth);
+ if (!rq_depth_scale_up(&rwb->rq_depth))
+ return;
calc_wb_limits(rwb);
rwb->unknown_cnt = 0;
rwb_wake_all(rwb);
@@ -317,7 +318,8 @@ static void scale_up(struct rq_wb *rwb)
static void scale_down(struct rq_wb *rwb, bool hard_throttle)
{
- rq_depth_scale_down(&rwb->rq_depth, hard_throttle);
+ if (!rq_depth_scale_down(&rwb->rq_depth, hard_throttle))
+ return;
calc_wb_limits(rwb);
rwb->unknown_cnt = 0;
rwb_trace_step(rwb, "scale down");
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 76d0f9de767b..58e09ffe8b9c 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -4791,27 +4791,6 @@ void ata_scsi_hotplug(struct work_struct *work)
return;
}
- /*
- * XXX - UGLY HACK
- *
- * The block layer suspend/resume path is fundamentally broken due
- * to freezable kthreads and workqueue and may deadlock if a block
- * device gets removed while resume is in progress. I don't know
- * what the solution is short of removing freezable kthreads and
- * workqueues altogether.
- *
- * The following is an ugly hack to avoid kicking off device
- * removal while freezer is active. This is a joke but does avoid
- * this particular deadlock scenario.
- *
- * https://bugzilla.kernel.org/show_bug.cgi?id=62801
- * http://marc.info/?l=linux-kernel&m=138695698516487
- */
-#ifdef CONFIG_FREEZER
- while (pm_freezing)
- msleep(10);
-#endif
-
DPRINTK("ENTER\n");
mutex_lock(&ap->scsi_scan_mutex);
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index ac07e8c94c79..478aa86fc1f2 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -248,8 +248,8 @@ static void nbd_put(struct nbd_device *nbd)
if (refcount_dec_and_mutex_lock(&nbd->refs,
&nbd_index_mutex)) {
idr_remove(&nbd_index_idr, nbd->index);
- mutex_unlock(&nbd_index_mutex);
nbd_dev_remove(nbd);
+ mutex_unlock(&nbd_index_mutex);
}
}
diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index eabc116832a7..3d7fdea872f8 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -142,8 +142,7 @@ static blk_status_t null_zone_reset(struct nullb_cmd *cmd, sector_t sector)
zone->wp = zone->start;
break;
default:
- cmd->error = BLK_STS_NOTSUPP;
- break;
+ return BLK_STS_NOTSUPP;
}
return BLK_STS_OK;
}
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 8a0381f1a43b..92972b5c1d00 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -591,14 +591,6 @@ static void io_cqring_add_event(struct io_ring_ctx *ctx, u64 user_data,
io_cqring_ev_posted(ctx);
}
-static void io_ring_drop_ctx_refs(struct io_ring_ctx *ctx, unsigned refs)
-{
- percpu_ref_put_many(&ctx->refs, refs);
-
- if (waitqueue_active(&ctx->wait))
- wake_up(&ctx->wait);
-}
-
static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
struct io_submit_state *state)
{
@@ -646,7 +638,7 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
req->result = 0;
return req;
out:
- io_ring_drop_ctx_refs(ctx, 1);
+ percpu_ref_put(&ctx->refs);
return NULL;
}
@@ -654,7 +646,7 @@ static void io_free_req_many(struct io_ring_ctx *ctx, void **reqs, int *nr)
{
if (*nr) {
kmem_cache_free_bulk(req_cachep, *nr, reqs);
- io_ring_drop_ctx_refs(ctx, *nr);
+ percpu_ref_put_many(&ctx->refs, *nr);
*nr = 0;
}
}
@@ -663,7 +655,7 @@ static void __io_free_req(struct io_kiocb *req)
{
if (req->file && !(req->flags & REQ_F_FIXED_FILE))
fput(req->file);
- io_ring_drop_ctx_refs(req->ctx, 1);
+ percpu_ref_put(&req->ctx->refs);
kmem_cache_free(req_cachep, req);
}
@@ -2761,7 +2753,7 @@ out:
if (link)
io_queue_link_head(ctx, link, &link->submit, shadow_req,
- block_for_last);
+ !block_for_last);
if (statep)
io_submit_state_end(statep);
@@ -2920,8 +2912,12 @@ static void io_finish_async(struct io_ring_ctx *ctx)
static void io_destruct_skb(struct sk_buff *skb)
{
struct io_ring_ctx *ctx = skb->sk->sk_user_data;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ctx->sqo_wq); i++)
+ if (ctx->sqo_wq[i])
+ flush_workqueue(ctx->sqo_wq[i]);
- io_finish_async(ctx);
unix_destruct_scm(skb);
}
@@ -3630,7 +3626,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
}
}
- io_ring_drop_ctx_refs(ctx, 1);
+ percpu_ref_put(&ctx->refs);
out_fput:
fdput(f);
return submitted ? submitted : ret;
diff --git a/kernel/freezer.c b/kernel/freezer.c
index c0738424bb43..dc520f01f99d 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -22,12 +22,6 @@ EXPORT_SYMBOL(system_freezing_cnt);
bool pm_freezing;
bool pm_nosig_freezing;
-/*
- * Temporary export for the deadlock workaround in ata_scsi_hotplug().
- * Remove once the hack becomes unnecessary.
- */
-EXPORT_SYMBOL_GPL(pm_freezing);
-
/* protects freezing and frozen transitions */
static DEFINE_SPINLOCK(freezer_lock);
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index d9daa3e422d0..c360f6a6c844 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -239,8 +239,8 @@ static int __init default_bdi_init(void)
{
int err;
- bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_FREEZABLE |
- WQ_UNBOUND | WQ_SYSFS, 0);
+ bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_UNBOUND |
+ WQ_SYSFS, 0);
if (!bdi_wq)
return -ENOMEM;