diff options
Diffstat (limited to '0001-block-loop-convert-to-per-device-workqueue.patch')
| -rw-r--r-- | 0001-block-loop-convert-to-per-device-workqueue.patch | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/0001-block-loop-convert-to-per-device-workqueue.patch b/0001-block-loop-convert-to-per-device-workqueue.patch deleted file mode 100644 index effd4faaf5b7..000000000000 --- a/0001-block-loop-convert-to-per-device-workqueue.patch +++ /dev/null @@ -1,133 +0,0 @@ -From ebff6d5c91195d37e33b7bbfb36c6cc0119aa06f 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 d7173cb..9786aa3 100644 ---- a/drivers/block/loop.c -+++ b/drivers/block/loop.c -@@ -86,8 +86,6 @@ static DEFINE_MUTEX(loop_index_mutex); - static int max_part; - static int part_shift; - --static struct workqueue_struct *loop_wq; -- - static int transfer_xor(struct loop_device *lo, int cmd, - struct page *raw_page, unsigned raw_off, - struct page *loop_page, unsigned loop_off, -@@ -725,6 +723,12 @@ 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; - -@@ -872,6 +876,8 @@ 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. -@@ -1425,9 +1431,13 @@ 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; -@@ -1441,9 +1451,9 @@ 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; -@@ -1455,9 +1465,6 @@ 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; - -@@ -1806,13 +1813,6 @@ 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); - -@@ -1850,8 +1850,6 @@ 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 - |