Subject: [SCSI] refactor sdev/starget/shost busy checking From: Kiyoshi Ueda Date: Thu Oct 23 11:42:16 2008 -0500: Git: 9d11251709f31d49c8167a619d4475fdf6cd7f73 This patch refactors the busy checking codes of scsi_device, Scsi_Host and scsi_target. There should be no functional change. This is a preparation for another patch which exports scsi's busy state to the block layer for request stacking drivers. Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: James Bottomley Signed-off-by: Hannes Reinecke --- drivers/scsi/scsi_lib.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -529,6 +529,14 @@ static void scsi_single_lun_run(struct s spin_unlock_irqrestore(shost->host_lock, flags); } +static inline int scsi_device_is_busy(struct scsi_device *sdev) +{ + if (sdev->device_busy >= sdev->queue_depth || sdev->device_blocked) + return 1; + + return 0; +} + static inline int scsi_target_is_busy(struct scsi_target *starget) { return ((starget->can_queue > 0 && @@ -536,6 +544,15 @@ static inline int scsi_target_is_busy(st starget->target_blocked); } +static inline int scsi_host_is_busy(struct Scsi_Host *shost) +{ + if ((shost->can_queue > 0 && shost->host_busy >= shost->can_queue) || + shost->host_blocked || shost->host_self_blocked) + return 1; + + return 0; +} + /* * Function: scsi_run_queue() * @@ -558,11 +575,7 @@ static void scsi_run_queue(struct reques scsi_single_lun_run(sdev); spin_lock_irqsave(shost->host_lock, flags); - while (!list_empty(&shost->starved_list) && - !shost->host_blocked && !shost->host_self_blocked && - !((shost->can_queue > 0) && - (shost->host_busy >= shost->can_queue))) { - + while (!list_empty(&shost->starved_list) && !scsi_host_is_busy(shost)) { int flagset; /* @@ -1349,8 +1362,6 @@ EXPORT_SYMBOL(scsi_prep_fn); static inline int scsi_dev_queue_ready(struct request_queue *q, struct scsi_device *sdev) { - if (sdev->device_busy >= sdev->queue_depth) - return 0; if (sdev->device_busy == 0 && sdev->device_blocked) { /* * unblock after device_blocked iterates to zero @@ -1364,7 +1375,7 @@ static inline int scsi_dev_queue_ready(s return 0; } } - if (sdev->device_blocked) + if (scsi_device_is_busy(sdev)) return 0; return 1; @@ -1441,8 +1452,7 @@ static inline int scsi_host_queue_ready( return 0; } } - if ((shost->can_queue > 0 && shost->host_busy >= shost->can_queue) || - shost->host_blocked || shost->host_self_blocked) { + if (scsi_host_is_busy(shost)) { if (list_empty(&sdev->starved_entry)) list_add_tail(&sdev->starved_entry, &shost->starved_list); return 0;