Move a bit code out of scsi_io_completion and into scsi_requeue_command
in preparation for further refactoring.
Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Bart Van Assche <bvanass...@acm.org>
---
drivers/scsi/scsi_lib.c | 86 ++++++++++++++++++++++---------------------------
1 file changed, 38 insertions(+), 48 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6400c6b..e8457fc 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -507,42 +507,6 @@ void scsi_requeue_run_queue(struct work_struct *work)
scsi_run_queue(q);
}
-/*
- * Function: scsi_requeue_command()
- *
- * Purpose: Handle post-processing of completed commands.
- *
- * Arguments: q - queue to operate on
- * cmd - command that may need to be requeued.
- *
- * Returns: Nothing
- *
- * Notes: After command completion, there may be blocks left
- * over which weren't finished by the previous command
- * this can be for a number of reasons - the main one is
- * I/O errors in the middle of the request, in which case
- * we need to request the blocks that come after the bad
- * sector.
- * Notes: Upon return, cmd is a stale pointer.
- */
-static void scsi_requeue_command(struct request_queue *q, struct scsi_cmnd
*cmd)
-{
- struct scsi_device *sdev = cmd->device;
- struct request *req = cmd->request;
- unsigned long flags;
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_unprep_request(req);
- req->special = NULL;
- scsi_put_command(cmd);
- blk_requeue_request(q, req);
- spin_unlock_irqrestore(q->queue_lock, flags);
-
- scsi_run_queue(q);
-
- put_device(&sdev->sdev_gendev);
-}
-
void scsi_run_host_queues(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
@@ -648,6 +612,43 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
}
}
+/**
+ * scsi_requeue_command - requeue a command from the I/O completion path.
+ * @cmd : command that needs to be requeued
+ *
+ * After command completion, there may be blocks left over which weren't
+ * finished by the previous command this can be for a number of reasons -
+ * the main one is I/O errors in the middle of the request, in which case
+ * we need to request the blocks that come after the bad sector.
+ */
+static void scsi_requeue_command(struct scsi_cmnd *cmd)
+{
+ struct request *req = cmd->request;
+ struct request_queue *q = req->q;
+
+ scsi_free_sgtables(cmd);
+
+ if (q->mq_ops) {
+ cmd->request->cmd_flags &= ~REQ_DONTPREP;
+ scsi_mq_uninit_cmd(cmd);
+ scsi_mq_requeue_cmd(cmd);
+ } else {
+ struct scsi_device *sdev = cmd->device;
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ blk_unprep_request(req);
+ req->special = NULL;
+ scsi_put_command(cmd);
+ blk_requeue_request(q, req);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ scsi_run_queue(q);
+
+ put_device(&sdev->sdev_gendev);
+ }
+}
+
static bool scsi_end_request(struct request *req, int error,
unsigned int bytes, unsigned int bidi_bytes)
{
@@ -779,7 +780,6 @@ static int __scsi_error_from_host_byte(struct scsi_cmnd
*cmd, int result)
void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
{
int result = cmd->result;
- struct request_queue *q = cmd->device->request_queue;
struct request *req = cmd->request;
int error = 0;
struct scsi_sense_hdr sshdr;
@@ -1015,17 +1015,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned
int good_bytes)
/*FALLTHRU*/
case ACTION_REPREP:
requeue:
- /* Unprep the request and put it back at the head of the queue.
- * A new command will be prepared and issued.
- */
- scsi_free_sgtables(cmd);
- if (q->mq_ops) {
- cmd->request->cmd_flags &= ~REQ_DONTPREP;
- scsi_mq_uninit_cmd(cmd);
- scsi_mq_requeue_cmd(cmd);
- } else {
- scsi_requeue_command(q, cmd);
- }
+ scsi_requeue_command(cmd);
break;
case ACTION_RETRY:
/* Retry the same command immediately */
--
1.9.1
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