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authorChristoph Hellwig <hch@infradead.org>2012-07-08 21:58:49 +0200
committerNicholas Bellinger <nab@linux-iscsi.org>2012-07-17 02:35:21 +0200
commitaf8772926f019b7bddd7477b8de5f3b0f12bad21 (patch)
tree99bdfc7335a3223985b033404fb06fc58cb754f0 /drivers/target/target_core_tmr.c
parenttarget: remove transport_generic_handle_cdb_map (diff)
downloadlinux-af8772926f019b7bddd7477b8de5f3b0f12bad21.tar.xz
linux-af8772926f019b7bddd7477b8de5f3b0f12bad21.zip
target: replace the processing thread with a TMR work queue
The last functionality of the target processing thread is offloading possibly long running task management requests from the submitter context. To keep TMR semantics the same we need a single threaded ordered queue, which can be provided by a per-device workqueue with the right flags. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_tmr.c')
-rw-r--r--drivers/target/target_core_tmr.c54
1 files changed, 1 insertions, 53 deletions
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 4185db109edf..1c59a3c23b2c 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -351,57 +351,6 @@ static void core_tmr_drain_state_list(
}
}
-static void core_tmr_drain_cmd_list(
- struct se_device *dev,
- struct se_cmd *prout_cmd,
- struct se_node_acl *tmr_nacl,
- int tas,
- struct list_head *preempt_and_abort_list)
-{
- LIST_HEAD(drain_cmd_list);
- struct se_queue_obj *qobj = &dev->dev_queue_obj;
- struct se_cmd *cmd, *tcmd;
- unsigned long flags;
-
- /*
- * Release all commands remaining in the per-device command queue.
- *
- * This follows the same logic as above for the state list.
- */
- spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
- list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
- /*
- * For PREEMPT_AND_ABORT usage, only process commands
- * with a matching reservation key.
- */
- if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
- continue;
- /*
- * Not aborting PROUT PREEMPT_AND_ABORT CDB..
- */
- if (prout_cmd == cmd)
- continue;
-
- cmd->transport_state &= ~CMD_T_QUEUED;
- atomic_dec(&qobj->queue_cnt);
- list_move_tail(&cmd->se_queue_node, &drain_cmd_list);
- }
- spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
-
- while (!list_empty(&drain_cmd_list)) {
- cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node);
- list_del_init(&cmd->se_queue_node);
-
- pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
- " %d t_fe_count: %d\n", (preempt_and_abort_list) ?
- "Preempt" : "", cmd, cmd->t_state,
- atomic_read(&cmd->t_fe_count));
-
- core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
- atomic_read(&cmd->t_fe_count));
- }
-}
-
int core_tmr_lun_reset(
struct se_device *dev,
struct se_tmr_req *tmr,
@@ -444,8 +393,7 @@ int core_tmr_lun_reset(
core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
preempt_and_abort_list);
- core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas,
- preempt_and_abort_list);
+
/*
* Clear any legacy SPC-2 reservation when called during
* LOGICAL UNIT RESET