Revert "block: fix accounting bug on cross partition merges"
This reverts commit 7681bfeeccff5efa9eb29bf09249a3c400b15327.
Conflicts:
include/linux/genhd.h
It has numerous issues with the cleanup path and non-elevator
devices. Revert it for now so we can come up with a clean
version without rushing things.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 51efd83..f854887 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -64,15 +64,13 @@
return;
cpu = part_stat_lock();
+ part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
- if (!new_io) {
- part = rq->part;
+ if (!new_io)
part_stat_inc(cpu, part, merges[rw]);
- } else {
- part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
+ else {
part_round_stats(cpu, part);
part_inc_in_flight(part, rw);
- rq->part = part;
}
part_stat_unlock();
@@ -130,7 +128,6 @@
rq->ref_count = 1;
rq->start_time = jiffies;
set_start_time_ns(rq);
- rq->part = NULL;
}
EXPORT_SYMBOL(blk_rq_init);
@@ -805,16 +802,11 @@
rl->starved[is_sync] = 0;
priv = !test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags);
- if (priv) {
+ if (priv)
rl->elvpriv++;
- /*
- * Don't do stats for non-priv requests
- */
- if (blk_queue_io_stat(q))
- rw_flags |= REQ_IO_STAT;
- }
-
+ if (blk_queue_io_stat(q))
+ rw_flags |= REQ_IO_STAT;
spin_unlock_irq(q->queue_lock);
rq = blk_alloc_request(q, rw_flags, priv, gfp_mask);
@@ -1791,7 +1783,7 @@
int cpu;
cpu = part_stat_lock();
- part = req->part;
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_add(cpu, part, sectors[rw], bytes >> 9);
part_stat_unlock();
}
@@ -1811,7 +1803,7 @@
int cpu;
cpu = part_stat_lock();
- part = req->part;
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 0a2fd8a..77b7c26 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -351,7 +351,7 @@
int cpu;
cpu = part_stat_lock();
- part = req->part;
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_round_stats(cpu, part);
part_dec_in_flight(part, rq_data_dir(req));
diff --git a/block/blk.h b/block/blk.h
index 1e675e5..2db8f32 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -116,6 +116,10 @@
int blk_dev_init(void);
+void elv_quiesce_start(struct request_queue *q);
+void elv_quiesce_end(struct request_queue *q);
+
+
/*
* Return the threshold (number of used requests) at which the queue is
* considered to be congested. It include a little hysteresis to keep the
diff --git a/block/genhd.c b/block/genhd.c
index a8adf96..5fa2b44 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -929,15 +929,8 @@
{
struct disk_part_tbl *ptbl =
container_of(head, struct disk_part_tbl, rcu_head);
- struct gendisk *disk = ptbl->disk;
- struct request_queue *q = disk->queue;
- unsigned long flags;
kfree(ptbl);
-
- spin_lock_irqsave(q->queue_lock, flags);
- elv_quiesce_end(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
}
/**
@@ -955,17 +948,11 @@
struct disk_part_tbl *new_ptbl)
{
struct disk_part_tbl *old_ptbl = disk->part_tbl;
- struct request_queue *q = disk->queue;
rcu_assign_pointer(disk->part_tbl, new_ptbl);
if (old_ptbl) {
rcu_assign_pointer(old_ptbl->last_lookup, NULL);
-
- spin_lock_irq(q->queue_lock);
- elv_quiesce_start(q);
- spin_unlock_irq(q->queue_lock);
-
call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb);
}
}
@@ -1006,7 +993,6 @@
return -ENOMEM;
new_ptbl->len = target;
- new_ptbl->disk = disk;
for (i = 0; i < len; i++)
rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]);