forked from AUR/linux-vfio
134 lines
3.7 KiB
Diff
134 lines
3.7 KiB
Diff
From ebcacf05168d9791d39c5434164c64b9ef937171 Mon Sep 17 00:00:00 2001
|
|
From: Ming Lei <ming.lei@canonical.com>
|
|
Date: Tue, 5 May 2015 19:49:54 +0800
|
|
Subject: [PATCH 1/2] block: loop: convert to per-device workqueue
|
|
|
|
Documentation/workqueue.txt:
|
|
If there is dependency among multiple work items used
|
|
during memory reclaim, they should be queued to separate
|
|
wq each with WQ_MEM_RECLAIM.
|
|
|
|
Loop devices can be stacked, so we have to convert to per-device
|
|
workqueue. One example is Fedora live CD.
|
|
|
|
Fixes: b5dd2f6047ca108001328aac0e8588edd15f1778
|
|
Cc: stable@vger.kernel.org (v4.0)
|
|
Cc: Justin M. Forbes <jforbes@fedoraproject.org>
|
|
Signed-off-by: Ming Lei <ming.lei@canonical.com>
|
|
Acked-by: Tejun Heo <tj@kernel.org>
|
|
Signed-off-by: Jens Axboe <axboe@fb.com>
|
|
---
|
|
drivers/block/loop.c | 30 ++++++++++++++----------------
|
|
drivers/block/loop.h | 1 +
|
|
2 files changed, 15 insertions(+), 16 deletions(-)
|
|
|
|
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
|
|
index d1f168b..fec06d5 100644
|
|
--- a/drivers/block/loop.c
|
|
+++ b/drivers/block/loop.c
|
|
@@ -85,8 +85,6 @@ static DEFINE_MUTEX(loop_index_mutex);
|
|
static int max_part;
|
|
static int part_shift;
|
|
|
|
-static struct workqueue_struct *loop_wq;
|
|
-
|
|
/*
|
|
* Transfer functions
|
|
*/
|
|
@@ -777,6 +775,12 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
|
|
size = get_loop_size(lo, file);
|
|
if ((loff_t)(sector_t)size != size)
|
|
goto out_putf;
|
|
+ error = -ENOMEM;
|
|
+ lo->wq = alloc_workqueue("kloopd%d",
|
|
+ WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 0,
|
|
+ lo->lo_number);
|
|
+ if (!lo->wq)
|
|
+ goto out_putf;
|
|
|
|
error = 0;
|
|
|
|
@@ -924,6 +928,8 @@ static int loop_clr_fd(struct loop_device *lo)
|
|
lo->lo_flags = 0;
|
|
if (!part_shift)
|
|
lo->lo_disk->flags |= GENHD_FL_NO_PART_SCAN;
|
|
+ destroy_workqueue(lo->wq);
|
|
+ lo->wq = NULL;
|
|
mutex_unlock(&lo->lo_ctl_mutex);
|
|
/*
|
|
* Need not hold lo_ctl_mutex to fput backing file.
|
|
@@ -1477,9 +1483,13 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *bd)
|
|
{
|
|
struct loop_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
|
|
+ struct loop_device *lo = cmd->rq->q->queuedata;
|
|
|
|
blk_mq_start_request(bd->rq);
|
|
|
|
+ if (lo->lo_state != Lo_bound)
|
|
+ return -EIO;
|
|
+
|
|
if (cmd->rq->cmd_flags & REQ_WRITE) {
|
|
struct loop_device *lo = cmd->rq->q->queuedata;
|
|
bool need_sched = true;
|
|
@@ -1493,9 +1503,9 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
spin_unlock_irq(&lo->lo_lock);
|
|
|
|
if (need_sched)
|
|
- queue_work(loop_wq, &lo->write_work);
|
|
+ queue_work(lo->wq, &lo->write_work);
|
|
} else {
|
|
- queue_work(loop_wq, &cmd->read_work);
|
|
+ queue_work(lo->wq, &cmd->read_work);
|
|
}
|
|
|
|
return BLK_MQ_RQ_QUEUE_OK;
|
|
@@ -1507,9 +1517,6 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
|
|
struct loop_device *lo = cmd->rq->q->queuedata;
|
|
int ret = -EIO;
|
|
|
|
- if (lo->lo_state != Lo_bound)
|
|
- goto failed;
|
|
-
|
|
if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY))
|
|
goto failed;
|
|
|
|
@@ -1858,13 +1865,6 @@ static int __init loop_init(void)
|
|
goto misc_out;
|
|
}
|
|
|
|
- loop_wq = alloc_workqueue("kloopd",
|
|
- WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 0);
|
|
- if (!loop_wq) {
|
|
- err = -ENOMEM;
|
|
- goto misc_out;
|
|
- }
|
|
-
|
|
blk_register_region(MKDEV(LOOP_MAJOR, 0), range,
|
|
THIS_MODULE, loop_probe, NULL, NULL);
|
|
|
|
@@ -1902,8 +1902,6 @@ static void __exit loop_exit(void)
|
|
blk_unregister_region(MKDEV(LOOP_MAJOR, 0), range);
|
|
unregister_blkdev(LOOP_MAJOR, "loop");
|
|
|
|
- destroy_workqueue(loop_wq);
|
|
-
|
|
misc_deregister(&loop_misc);
|
|
}
|
|
|
|
diff --git a/drivers/block/loop.h b/drivers/block/loop.h
|
|
index 301c27f..49564ed 100644
|
|
--- a/drivers/block/loop.h
|
|
+++ b/drivers/block/loop.h
|
|
@@ -54,6 +54,7 @@ struct loop_device {
|
|
gfp_t old_gfp_mask;
|
|
|
|
spinlock_t lo_lock;
|
|
+ struct workqueue_struct *wq;
|
|
struct list_head write_cmd_head;
|
|
struct work_struct write_work;
|
|
bool write_started;
|
|
--
|
|
2.4.5
|
|
|