block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones

Implement accessors - blk_rq_pos(), blk_rq_sectors() and
blk_rq_cur_sectors() which return rq->hard_sector, rq->hard_nr_sectors
and rq->hard_cur_sectors respectively and convert direct references of
the said fields to the accessors.

This is in preparation of request data length handling cleanup.

Geert	: suggested adding const to struct request * parameter to accessors
Sergei	: spotted error in patch description

[ Impact: cleanup ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Ackec-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index c8d0876..c167de5 100644 (file)
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -163,7 +163,7 @@ static inline bool start_ordered(struct request_queue *q, struct request **rqp)
         * For an empty barrier, there's no actual BAR request, which
         * in turn makes POSTFLUSH unnecessary.  Mask them off.
         */
-       if (!rq->hard_nr_sectors) {
+       if (!blk_rq_sectors(rq)) {
                q->ordered &= ~(QUEUE_ORDERED_DO_BAR |
                                QUEUE_ORDERED_DO_POSTFLUSH);
                /*

diff --git a/block/blk-core.c b/block/blk-core.c
index 394c5bd..895e55b 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1683,7 +1683,7 @@ static void blk_account_io_done(struct request *req)
 unsigned int blk_rq_bytes(struct request *rq)
 {
        if (blk_fs_request(rq))
-               return rq->hard_nr_sectors << 9;
+               return blk_rq_sectors(rq) << 9;
 
        return rq->data_len;
 }

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index def0c69..575083a 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -760,7 +760,7 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
                                                cfqd->rq_in_driver);
 
-       cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors;
+       cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
 }
 
 static void cfq_deactivate_request(struct request_queue *q, struct request *rq)

diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index f6586e4..c238867 100644 (file)
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -136,7 +136,7 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
        dev_dbg(&dev->sbd.core,
                "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
                __func__, __LINE__, op, n, req->nr_sectors,
-               req->hard_nr_sectors);
+               blk_rq_sectors(req));
 #endif
 
        start_sector = req->sector * priv->blocking_factor;

diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index ecccf65..e821eed 100644 (file)
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -368,12 +368,12 @@ static void do_viodasd_request(struct request_queue *q)
                blkdev_dequeue_request(req);
                /* check that request contains a valid command */
                if (!blk_fs_request(req)) {
-                       viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+                       viodasd_end_request(req, -EIO, blk_rq_sectors(req));
                        continue;
                }
                /* Try sending the request */
                if (send_request(req) != 0)
-                       viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+                       viodasd_end_request(req, -EIO, blk_rq_sectors(req));
        }
 }
 
@@ -590,7 +590,7 @@ static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
                err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
                printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
                                event->xRc, bevent->sub_result, err->msg);
-               num_sect = req->hard_nr_sectors;
+               num_sect = blk_rq_sectors(req);
        }
        qlock = req->q->queue_lock;
        spin_lock_irqsave(qlock, irq_flags);

diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index b1e1d7e..5722931 100644 (file)
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -645,8 +645,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
 
                /* Okay, it's a data request, set it up for transfer */
                dev_dbg(ace->dev,
-                       "request: sec=%llx hcnt=%lx, ccnt=%x, dir=%i\n",
-                       (unsigned long long) req->sector, req->hard_nr_sectors,
+                       "request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
+                       (unsigned long long) req->sector, blk_rq_sectors(req),
                        req->current_nr_sectors, rq_data_dir(req));
 
                ace->req = req;
@@ -654,7 +654,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
                ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
                ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
 
-               count = req->hard_nr_sectors;
+               count = blk_rq_sectors(req);
                if (rq_data_dir(req)) {
                        /* Kick off write request */
                        dev_dbg(ace->dev, "write data\n");
@@ -719,8 +719,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
                /* bio finished; is there another one? */
                if (__blk_end_request(ace->req, 0,
                                        blk_rq_cur_bytes(ace->req))) {
-                       /* dev_dbg(ace->dev, "next block; h=%li c=%i\n",
-                        *      ace->req->hard_nr_sectors,
+                       /* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
+                        *      blk_rq_sectors(ace->req),
                         *      ace->req->current_nr_sectors);
                         */
                        ace->data_ptr = ace->req->buffer;

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 8bbe222..182320d 100644 (file)
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -730,7 +730,7 @@ out_end:
                if (blk_pc_request(rq))
                        nsectors = (rq->data_len + 511) >> 9;
                else
-                       nsectors = rq->hard_nr_sectors;
+                       nsectors = blk_rq_sectors(rq);
 
                if (nsectors == 0)
                        nsectors = 1;
@@ -875,7 +875,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
 
        return ide_issue_pc(drive, &cmd);
 out_end:
-       nsectors = rq->hard_nr_sectors;
+       nsectors = blk_rq_sectors(rq);
 
        if (nsectors == 0)
                nsectors = 1;
@@ -1359,8 +1359,8 @@ static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
 static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
 {
        int hard_sect = queue_hardsect_size(q);
-       long block = (long)rq->hard_sector / (hard_sect >> 9);
-       unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
+       long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
+       unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
 
        memset(rq->cmd, 0, BLK_MAX_CDB);
 

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index a0309ea..df23bcb 100644 (file)
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -118,7 +118,7 @@ unsigned int ide_rq_bytes(struct request *rq)
        if (blk_pc_request(rq))
                return rq->data_len;
        else
-               return rq->hard_cur_sectors << 9;
+               return blk_rq_cur_sectors(rq) << 9;
 }
 EXPORT_SYMBOL_GPL(ide_rq_bytes);
 
@@ -133,7 +133,7 @@ int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
         * and complete the whole request right now
         */
        if (blk_noretry_request(rq) && error <= 0)
-               nr_bytes = rq->hard_nr_sectors << 9;
+               nr_bytes = blk_rq_sectors(rq) << 9;
 
        rc = ide_end_rq(drive, rq, error, nr_bytes);
        if (rc == 0)

diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 221317e..56e60f0 100644 (file)
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -427,7 +427,7 @@ static void i2o_block_end_request(struct request *req, int error,
        unsigned long flags;
 
        if (blk_end_request(req, error, nr_bytes)) {
-               int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT);
+               int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
 
                if (blk_pc_request(req))
                        leftover = req->data_len;

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7d49ef5..9ff0ca9 100644 (file)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -546,7 +546,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
         * to queue the remainder of them.
         */
        if (blk_end_request(req, error, bytes)) {
-               int leftover = (req->hard_nr_sectors << 9);
+               int leftover = blk_rq_sectors(req) << 9;
 
                if (blk_pc_request(req))
                        leftover = req->resid_len;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6a967ca..4e5f855 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -832,13 +832,30 @@ static inline void blk_run_address_space(struct address_space *mapping)
 extern void blkdev_dequeue_request(struct request *req);
 
 /*
- * blk_end_request() takes bytes instead of sectors as a complete size.
- * blk_rq_bytes() returns bytes left to complete in the entire request.
- * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
+ * blk_rq_pos()                : the current sector
+ * blk_rq_bytes()      : bytes left in the entire request
+ * blk_rq_cur_bytes()  : bytes left in the current segment
+ * blk_rq_sectors()    : sectors left in the entire request
+ * blk_rq_cur_sectors()        : sectors left in the current segment
  */
+static inline sector_t blk_rq_pos(const struct request *rq)
+{
+       return rq->hard_sector;
+}
+
 extern unsigned int blk_rq_bytes(struct request *rq);
 extern unsigned int blk_rq_cur_bytes(struct request *rq);
 
+static inline unsigned int blk_rq_sectors(const struct request *rq)
+{
+       return rq->hard_nr_sectors;
+}
+
+static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
+{
+       return rq->hard_cur_sectors;
+}
+
 /*
  * Request completion related functions.
  *

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 921ef5d..42f1c11 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -646,7 +646,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
                                rq->cmd_len, rq->cmd);
        } else  {
                what |= BLK_TC_ACT(BLK_TC_FS);
-               __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+               __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
                                rw, what, rq->errors, 0, NULL);
        }
 }
@@ -857,7 +857,7 @@ void blk_add_driver_data(struct request_queue *q,
                __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
                                rq->errors, len, data);
        else
-               __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+               __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
                                0, BLK_TA_DRV_DATA, rq->errors, len, data);
 }
 EXPORT_SYMBOL_GPL(blk_add_driver_data);