[PATCH] Remove ->waiting member from struct request

As the comments indicates in blkdev.h, we can fold it into ->end_io_data
usage as that is really what ->waiting is. Fixup the users of
blk_end_sync_rq().

Signed-off-by: Jens Axboe <axboe@kernel.dk>

9 files changed, 20 insertions, 25 deletions

diff --git a/block/elevator.c b/block/elevator.c
index cbbc36ba016a..924b81b08f86 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -67,8 +67,7 @@ inline int elv_rq_merge_ok(struct request *rq, struct bio *bio)
         /*
          * same device and no special stuff set, merge is ok
          */
-        if (rq->rq_disk == bio->bi_bdev->bd_disk &&
-            !rq->waiting && !rq->special)
+        if (rq->rq_disk == bio->bi_bdev->bd_disk && !rq->special)
                 return 1;
 
         return 0;
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index d388486e98bb..3b6aad2affd8 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -291,7 +291,6 @@ static inline void rq_init(request_queue_t *q, struct request *rq)
         rq->buffer = NULL;
         rq->ref_count = 1;
         rq->q = q;
-        rq->waiting = NULL;
         rq->special = NULL;
         rq->data_len = 0;
         rq->data = NULL;
@@ -451,6 +450,7 @@ static void queue_flush(request_queue_t *q, unsigned which)
         rq->cmd_flags = REQ_HARDBARRIER;
         rq_init(q, rq);
         rq->elevator_private = NULL;
+        rq->elevator_private2 = NULL;
         rq->rq_disk = q->bar_rq.rq_disk;
         rq->rl = NULL;
         rq->end_io = end_io;
@@ -479,6 +479,7 @@ static inline struct request *start_ordered(request_queue_t *q,
                 rq->cmd_flags |= REQ_RW;
         rq->cmd_flags |= q->ordered & QUEUE_ORDERED_FUA ? REQ_FUA : 0;
         rq->elevator_private = NULL;
+        rq->elevator_private2 = NULL;
         rq->rl = NULL;
         init_request_from_bio(rq, q->orig_bar_rq->bio);
         rq->end_io = bar_end_io;
@@ -2569,10 +2570,9 @@ int blk_execute_rq(request_queue_t *q, struct gendisk *bd_disk,
                 rq->sense_len = 0;
         }
 
-        rq->waiting = &wait;
+        rq->end_io_data = &wait;
         blk_execute_rq_nowait(q, bd_disk, rq, at_head, blk_end_sync_rq);
         wait_for_completion(&wait);
-        rq->waiting = NULL;
 
         if (rq->errors)
                 err = -EIO;
@@ -2736,9 +2736,9 @@ EXPORT_SYMBOL(blk_put_request);
  */
 void blk_end_sync_rq(struct request *rq, int error)
 {
-        struct completion *waiting = rq->waiting;
+        struct completion *waiting = rq->end_io_data;
 
-        rq->waiting = NULL;
+        rq->end_io_data = NULL;
         __blk_put_request(rq->q, rq);
 
         /*
@@ -2801,7 +2801,7 @@ static int attempt_merge(request_queue_t *q, struct request *req,
 
         if (rq_data_dir(req) != rq_data_dir(next)
             || req->rq_disk != next->rq_disk
-            || next->waiting || next->special)
+            || next->special)
                 return 0;
 
         /*
@@ -2886,7 +2886,6 @@ static void init_request_from_bio(struct request *req, struct bio *bio)
         req->nr_phys_segments = bio_phys_segments(req->q, bio);
         req->nr_hw_segments = bio_hw_segments(req->q, bio);
         req->buffer = bio_data(bio);    /* see ->buffer comment above */
-        req->waiting = NULL;
         req->bio = req->biotail = bio;
         req->ioprio = bio_prio(bio);
         req->rq_disk = bio->bi_bdev->bd_disk;
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index a360215dbce7..2568640430fb 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3331,7 +3331,7 @@ static int DAC960_process_queue(DAC960_Controller_T *Controller, struct request_
                 Command->DmaDirection = PCI_DMA_TODEVICE;
                 Command->CommandType = DAC960_WriteCommand;
         }
-        Command->Completion = Request->waiting;
+        Command->Completion = Request->end_io_data;
         Command->LogicalDriveNumber = (long)Request->rq_disk->private_data;
         Command->BlockNumber = Request->sector;
         Command->BlockCount = Request->nr_sectors;
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 12ff1a274d91..500d2ebb41e4 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -722,11 +722,10 @@ static int pd_special_command(struct pd_unit *disk,
         rq.rq_status = RQ_ACTIVE;
         rq.rq_disk = disk->gd;
         rq.ref_count = 1;
-        rq.waiting = &wait;
+        rq.end_io_data = &wait;
         rq.end_io = blk_end_sync_rq;
         blk_insert_request(disk->gd->queue, &rq, 0, func);
         wait_for_completion(&wait);
-        rq.waiting = NULL;
         if (rq.errors)
                 err = -EIO;
         blk_put_request(&rq);
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 42891d2b054e..888d1aceeeff 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -375,7 +375,7 @@ static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *
         rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
 
         rq->ref_count++;
-        rq->waiting = &wait;
+        rq->end_io_data = &wait;
         rq->end_io = blk_end_sync_rq;
         elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
         generic_unplug_device(q);
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 3436b1f104eb..a3ffb04436bd 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -141,7 +141,7 @@ enum {
 
 static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
 {
-        struct request_pm_state *pm = rq->end_io_data;
+        struct request_pm_state *pm = rq->data;
 
         if (drive->media != ide_disk)
                 return;
@@ -164,7 +164,7 @@ static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 s
 
 static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 {
-        struct request_pm_state *pm = rq->end_io_data;
+        struct request_pm_state *pm = rq->data;
         ide_task_t *args = rq->special;
 
         memset(args, 0, sizeof(*args));
@@ -421,7 +421,7 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
                         }
                 }
         } else if (blk_pm_request(rq)) {
-                struct request_pm_state *pm = rq->end_io_data;
+                struct request_pm_state *pm = rq->data;
 #ifdef DEBUG_PM
                 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
                         drive->name, rq->pm->pm_step, stat, err);
@@ -933,7 +933,7 @@ done:
 
 static void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 {
-        struct request_pm_state *pm = rq->end_io_data;
+        struct request_pm_state *pm = rq->data;
 
         if (blk_pm_suspend_request(rq) &&
             pm->pm_step == ide_pm_state_start_suspend)
@@ -1018,7 +1018,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
                     rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
                         return execute_drive_cmd(drive, rq);
                 else if (blk_pm_request(rq)) {
-                        struct request_pm_state *pm = rq->end_io_data;
+                        struct request_pm_state *pm = rq->data;
 #ifdef DEBUG_PM
                         printk("%s: start_power_step(step: %d)\n",
                                 drive->name, rq->pm->pm_step);
@@ -1718,7 +1718,7 @@ int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t actio
          */
         if (must_wait) {
                 rq->ref_count++;
-                rq->waiting = &wait;
+                rq->end_io_data = &wait;
                 rq->end_io = blk_end_sync_rq;
         }
 
@@ -1736,7 +1736,6 @@ int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t actio
         err = 0;
         if (must_wait) {
                 wait_for_completion(&wait);
-                rq->waiting = NULL;
                 if (rq->errors)
                         err = -EIO;
 
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 643e4b9ac651..66f9678d2f10 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -2773,7 +2773,7 @@ static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
                 return;
         }
 #endif /* IDETAPE_DEBUG_BUGS */
-        rq->waiting = &wait;
+        rq->end_io_data = &wait;
         rq->end_io = blk_end_sync_rq;
         spin_unlock_irq(&tape->spinlock);
         wait_for_completion(&wait);
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 9384a3fdde6c..2b1a1389c318 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1219,7 +1219,7 @@ static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
         memset(&args, 0, sizeof(args));
         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
         rq.special = &args;
-        rq.end_io_data = &rqpm;
+        rq.data = &rqpm;
         rqpm.pm_step = ide_pm_state_start_suspend;
         if (mesg.event == PM_EVENT_PRETHAW)
                 mesg.event = PM_EVENT_FREEZE;
@@ -1240,7 +1240,7 @@ static int generic_ide_resume(struct device *dev)
         memset(&args, 0, sizeof(args));
         rq.cmd_type = REQ_TYPE_PM_RESUME;
         rq.special = &args;
-        rq.end_io_data = &rqpm;
+        rq.data = &rqpm;
         rqpm.pm_step = ide_pm_state_start_resume;
         rqpm.pm_state = PM_EVENT_ON;
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d2dc17151f6c..604f23189097 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -266,7 +266,6 @@ struct request {
         request_queue_t *q;
         struct request_list *rl;
 
-        struct completion *waiting;
         void *special;
         char *buffer;
 
@@ -285,7 +284,7 @@ struct request {
         int retries;
 
         /*
-         * completion callback. end_io_data should be folded in with waiting
+         * completion callback.
          */
         rq_end_io_fn *end_io;
         void *end_io_data;