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target: Drop se_device TCQ queue_depth usage from I/O path

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Historically, pSCSI devices have been the ones that required target-core
to enforce a per se_device->depth_left.  This patch changes target-core
to no longer (by default) enforce a per se_device->depth_left or sleep in
transport_tcq_window_closed() when we out of queue slots for all backend
export cases.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger
2011-11-30 01:25:21 -08:00
parent 40be67f4c5
commit 65586d51e0
4 changed files with 2 additions and 46 deletions
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include/target/target_core_base.h
-1
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@@ -798,7 +798,6 @@ struct se_device {
spinlock_t stats_lock;
/* Active commands on this virtual SE device */
atomic_t simple_cmds;
atomic_t depth_left;
atomic_t dev_ordered_id;
atomic_t execute_tasks;
atomic_t dev_ordered_sync;