Merge branch 'blk-end-request' of git://git.kernel.dk/linux-2.6-block
* 'blk-end-request' of git://git.kernel.dk/linux-2.6-block: (30 commits)
blk_end_request: changing xsysace (take 4)
blk_end_request: changing ub (take 4)
blk_end_request: cleanup of request completion (take 4)
blk_end_request: cleanup 'uptodate' related code (take 4)
blk_end_request: remove/unexport end_that_request_* (take 4)
blk_end_request: changing scsi (take 4)
blk_end_request: add bidi completion interface (take 4)
blk_end_request: changing ide-cd (take 4)
blk_end_request: add callback feature (take 4)
blk_end_request: changing ide normal caller (take 4)
blk_end_request: changing cpqarray (take 4)
blk_end_request: changing cciss (take 4)
blk_end_request: changing ide-scsi (take 4)
blk_end_request: changing s390 (take 4)
blk_end_request: changing mmc (take 4)
blk_end_request: changing i2o_block (take 4)
blk_end_request: changing viocd (take 4)
blk_end_request: changing xen-blkfront (take 4)
blk_end_request: changing viodasd (take 4)
blk_end_request: changing sx8 (take 4)
...
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index 45a77df..1945ddf 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -116,8 +116,8 @@
}
spin_lock(q->queue_lock);
- blkdev_dequeue_request(rq);
- end_that_request_last(rq, 0);
+ if (__blk_end_request(rq, 0, 0))
+ BUG();
spin_unlock(q->queue_lock);
}
}
@@ -149,10 +149,8 @@
msg = (mbox_msg_t) rq->data;
- spin_lock_irqsave(q->queue_lock, flags);
- blkdev_dequeue_request(rq);
- end_that_request_last(rq, 0);
- spin_unlock_irqrestore(q->queue_lock, flags);
+ if (blk_end_request(rq, 0, 0))
+ BUG();
mbox->rxq->callback((void *)msg);
}
@@ -263,10 +261,8 @@
*p = (mbox_msg_t) rq->data;
- spin_lock_irqsave(q->queue_lock, flags);
- blkdev_dequeue_request(rq);
- end_that_request_last(rq, 0);
- spin_unlock_irqrestore(q->queue_lock, flags);
+ if (blk_end_request(rq, 0, 0))
+ BUG();
if (unlikely(mbox_seq_test(mbox, *p))) {
pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p);
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index b1a77b1..99f9f96 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -475,17 +475,9 @@
/* Only changed by ubd_init, which is an initcall. */
int thread_fd = -1;
-static void ubd_end_request(struct request *req, int bytes, int uptodate)
+static void ubd_end_request(struct request *req, int bytes, int error)
{
- if (!end_that_request_first(req, uptodate, bytes >> 9)) {
- struct ubd *dev = req->rq_disk->private_data;
- unsigned long flags;
-
- add_disk_randomness(req->rq_disk);
- spin_lock_irqsave(&dev->lock, flags);
- end_that_request_last(req, uptodate);
- spin_unlock_irqrestore(&dev->lock, flags);
- }
+ blk_end_request(req, error, bytes);
}
/* Callable only from interrupt context - otherwise you need to do
@@ -493,10 +485,10 @@
static inline void ubd_finish(struct request *req, int bytes)
{
if(bytes < 0){
- ubd_end_request(req, 0, 0);
+ ubd_end_request(req, 0, -EIO);
return;
}
- ubd_end_request(req, bytes, 1);
+ ubd_end_request(req, bytes, 0);
}
static LIST_HEAD(restart);
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index b901db6..c16fdfe 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -347,7 +347,6 @@
void blk_ordered_complete_seq(struct request_queue *q, unsigned seq, int error)
{
struct request *rq;
- int uptodate;
if (error && !q->orderr)
q->orderr = error;
@@ -361,15 +360,11 @@
/*
* Okay, sequence complete.
*/
- uptodate = 1;
- if (q->orderr)
- uptodate = q->orderr;
-
q->ordseq = 0;
rq = q->orig_bar_rq;
- end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
- end_that_request_last(rq, uptodate);
+ if (__blk_end_request(rq, q->orderr, blk_rq_bytes(rq)))
+ BUG();
}
static void pre_flush_end_io(struct request *rq, int error)
@@ -486,9 +481,9 @@
* ORDERED_NONE while this request is on it.
*/
blkdev_dequeue_request(rq);
- end_that_request_first(rq, -EOPNOTSUPP,
- rq->hard_nr_sectors);
- end_that_request_last(rq, -EOPNOTSUPP);
+ if (__blk_end_request(rq, -EOPNOTSUPP,
+ blk_rq_bytes(rq)))
+ BUG();
*rqp = NULL;
return 0;
}
@@ -3437,29 +3432,36 @@
}
}
-static int __end_that_request_first(struct request *req, int uptodate,
+/**
+ * __end_that_request_first - end I/O on a request
+ * @req: the request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @req, and sets it up
+ * for the next range of segments (if any) in the cluster.
+ *
+ * Return:
+ * 0 - we are done with this request, call end_that_request_last()
+ * 1 - still buffers pending for this request
+ **/
+static int __end_that_request_first(struct request *req, int error,
int nr_bytes)
{
- int total_bytes, bio_nbytes, error, next_idx = 0;
+ int total_bytes, bio_nbytes, next_idx = 0;
struct bio *bio;
blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
/*
- * extend uptodate bool to allow < 0 value to be direct io error
- */
- error = 0;
- if (end_io_error(uptodate))
- error = !uptodate ? -EIO : uptodate;
-
- /*
* for a REQ_BLOCK_PC request, we want to carry any eventual
* sense key with us all the way through
*/
if (!blk_pc_request(req))
req->errors = 0;
- if (!uptodate) {
+ if (error) {
if (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))
printk("end_request: I/O error, dev %s, sector %llu\n",
req->rq_disk ? req->rq_disk->disk_name : "?",
@@ -3553,49 +3555,6 @@
return 1;
}
-/**
- * end_that_request_first - end I/O on a request
- * @req: the request being processed
- * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
- * @nr_sectors: number of sectors to end I/O on
- *
- * Description:
- * Ends I/O on a number of sectors attached to @req, and sets it up
- * for the next range of segments (if any) in the cluster.
- *
- * Return:
- * 0 - we are done with this request, call end_that_request_last()
- * 1 - still buffers pending for this request
- **/
-int end_that_request_first(struct request *req, int uptodate, int nr_sectors)
-{
- return __end_that_request_first(req, uptodate, nr_sectors << 9);
-}
-
-EXPORT_SYMBOL(end_that_request_first);
-
-/**
- * end_that_request_chunk - end I/O on a request
- * @req: the request being processed
- * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
- * @nr_bytes: number of bytes to complete
- *
- * Description:
- * Ends I/O on a number of bytes attached to @req, and sets it up
- * for the next range of segments (if any). Like end_that_request_first(),
- * but deals with bytes instead of sectors.
- *
- * Return:
- * 0 - we are done with this request, call end_that_request_last()
- * 1 - still buffers pending for this request
- **/
-int end_that_request_chunk(struct request *req, int uptodate, int nr_bytes)
-{
- return __end_that_request_first(req, uptodate, nr_bytes);
-}
-
-EXPORT_SYMBOL(end_that_request_chunk);
-
/*
* splice the completion data to a local structure and hand off to
* process_completion_queue() to complete the requests
@@ -3675,17 +3634,15 @@
/*
* queue lock must be held
*/
-void end_that_request_last(struct request *req, int uptodate)
+static void end_that_request_last(struct request *req, int error)
{
struct gendisk *disk = req->rq_disk;
- int error;
- /*
- * extend uptodate bool to allow < 0 value to be direct io error
- */
- error = 0;
- if (end_io_error(uptodate))
- error = !uptodate ? -EIO : uptodate;
+ if (blk_rq_tagged(req))
+ blk_queue_end_tag(req->q, req);
+
+ if (blk_queued_rq(req))
+ blkdev_dequeue_request(req);
if (unlikely(laptop_mode) && blk_fs_request(req))
laptop_io_completion();
@@ -3704,32 +3661,54 @@
disk_round_stats(disk);
disk->in_flight--;
}
+
if (req->end_io)
req->end_io(req, error);
- else
+ else {
+ if (blk_bidi_rq(req))
+ __blk_put_request(req->next_rq->q, req->next_rq);
+
__blk_put_request(req->q, req);
-}
-
-EXPORT_SYMBOL(end_that_request_last);
-
-static inline void __end_request(struct request *rq, int uptodate,
- unsigned int nr_bytes, int dequeue)
-{
- if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
- if (dequeue)
- blkdev_dequeue_request(rq);
- add_disk_randomness(rq->rq_disk);
- end_that_request_last(rq, uptodate);
}
}
-static unsigned int rq_byte_size(struct request *rq)
+static inline void __end_request(struct request *rq, int uptodate,
+ unsigned int nr_bytes)
+{
+ int error = 0;
+
+ if (uptodate <= 0)
+ error = uptodate ? uptodate : -EIO;
+
+ __blk_end_request(rq, error, nr_bytes);
+}
+
+/**
+ * blk_rq_bytes - Returns bytes left to complete in the entire request
+ **/
+unsigned int blk_rq_bytes(struct request *rq)
{
if (blk_fs_request(rq))
return rq->hard_nr_sectors << 9;
return rq->data_len;
}
+EXPORT_SYMBOL_GPL(blk_rq_bytes);
+
+/**
+ * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
+ **/
+unsigned int blk_rq_cur_bytes(struct request *rq)
+{
+ if (blk_fs_request(rq))
+ return rq->current_nr_sectors << 9;
+
+ if (rq->bio)
+ return rq->bio->bi_size;
+
+ return rq->data_len;
+}
+EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
/**
* end_queued_request - end all I/O on a queued request
@@ -3744,7 +3723,7 @@
**/
void end_queued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, rq_byte_size(rq), 1);
+ __end_request(rq, uptodate, blk_rq_bytes(rq));
}
EXPORT_SYMBOL(end_queued_request);
@@ -3761,7 +3740,7 @@
**/
void end_dequeued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, rq_byte_size(rq), 0);
+ __end_request(rq, uptodate, blk_rq_bytes(rq));
}
EXPORT_SYMBOL(end_dequeued_request);
@@ -3787,10 +3766,159 @@
**/
void end_request(struct request *req, int uptodate)
{
- __end_request(req, uptodate, req->hard_cur_sectors << 9, 1);
+ __end_request(req, uptodate, req->hard_cur_sectors << 9);
}
EXPORT_SYMBOL(end_request);
+/**
+ * blk_end_io - Generic end_io function to complete a request.
+ * @rq: the request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete @rq
+ * @bidi_bytes: number of bytes to complete @rq->next_rq
+ * @drv_callback: function called between completion of bios in the request
+ * and completion of the request.
+ * If the callback returns non 0, this helper returns without
+ * completion of the request.
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * Return:
+ * 0 - we are done with this request
+ * 1 - this request is not freed yet, it still has pending buffers.
+ **/
+static int blk_end_io(struct request *rq, int error, int nr_bytes,
+ int bidi_bytes, int (drv_callback)(struct request *))
+{
+ struct request_queue *q = rq->q;
+ unsigned long flags = 0UL;
+
+ if (blk_fs_request(rq) || blk_pc_request(rq)) {
+ if (__end_that_request_first(rq, error, nr_bytes))
+ return 1;
+
+ /* Bidi request must be completed as a whole */
+ if (blk_bidi_rq(rq) &&
+ __end_that_request_first(rq->next_rq, error, bidi_bytes))
+ return 1;
+ }
+
+ /* Special feature for tricky drivers */
+ if (drv_callback && drv_callback(rq))
+ return 1;
+
+ add_disk_randomness(rq->rq_disk);
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ end_that_request_last(rq, error);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ return 0;
+}
+
+/**
+ * blk_end_request - Helper function for drivers to complete the request.
+ * @rq: the request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * Return:
+ * 0 - we are done with this request
+ * 1 - still buffers pending for this request
+ **/
+int blk_end_request(struct request *rq, int error, int nr_bytes)
+{
+ return blk_end_io(rq, error, nr_bytes, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(blk_end_request);
+
+/**
+ * __blk_end_request - Helper function for drivers to complete the request.
+ * @rq: the request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ * Must be called with queue lock held unlike blk_end_request().
+ *
+ * Return:
+ * 0 - we are done with this request
+ * 1 - still buffers pending for this request
+ **/
+int __blk_end_request(struct request *rq, int error, int nr_bytes)
+{
+ if (blk_fs_request(rq) || blk_pc_request(rq)) {
+ if (__end_that_request_first(rq, error, nr_bytes))
+ return 1;
+ }
+
+ add_disk_randomness(rq->rq_disk);
+
+ end_that_request_last(rq, error);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__blk_end_request);
+
+/**
+ * blk_end_bidi_request - Helper function for drivers to complete bidi request.
+ * @rq: the bidi request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete @rq
+ * @bidi_bytes: number of bytes to complete @rq->next_rq
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
+ *
+ * Return:
+ * 0 - we are done with this request
+ * 1 - still buffers pending for this request
+ **/
+int blk_end_bidi_request(struct request *rq, int error, int nr_bytes,
+ int bidi_bytes)
+{
+ return blk_end_io(rq, error, nr_bytes, bidi_bytes, NULL);
+}
+EXPORT_SYMBOL_GPL(blk_end_bidi_request);
+
+/**
+ * blk_end_request_callback - Special helper function for tricky drivers
+ * @rq: the request being processed
+ * @error: 0 for success, < 0 for error
+ * @nr_bytes: number of bytes to complete
+ * @drv_callback: function called between completion of bios in the request
+ * and completion of the request.
+ * If the callback returns non 0, this helper returns without
+ * completion of the request.
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * This special helper function is used only for existing tricky drivers.
+ * (e.g. cdrom_newpc_intr() of ide-cd)
+ * This interface will be removed when such drivers are rewritten.
+ * Don't use this interface in other places anymore.
+ *
+ * Return:
+ * 0 - we are done with this request
+ * 1 - this request is not freed yet.
+ * this request still has pending buffers or
+ * the driver doesn't want to finish this request yet.
+ **/
+int blk_end_request_callback(struct request *rq, int error, int nr_bytes,
+ int (drv_callback)(struct request *))
+{
+ return blk_end_io(rq, error, nr_bytes, 0, drv_callback);
+}
+EXPORT_SYMBOL_GPL(blk_end_request_callback);
+
static void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio)
{
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 9030c37..cd03473 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3455,19 +3455,12 @@
bool SuccessfulIO)
{
struct request *Request = Command->Request;
- int UpToDate;
-
- UpToDate = 0;
- if (SuccessfulIO)
- UpToDate = 1;
+ int Error = SuccessfulIO ? 0 : -EIO;
pci_unmap_sg(Command->Controller->PCIDevice, Command->cmd_sglist,
Command->SegmentCount, Command->DmaDirection);
- if (!end_that_request_first(Request, UpToDate, Command->BlockCount)) {
- add_disk_randomness(Request->rq_disk);
- end_that_request_last(Request, UpToDate);
-
+ if (!__blk_end_request(Request, Error, Command->BlockCount << 9)) {
if (Command->Completion) {
complete(Command->Completion);
Command->Completion = NULL;
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 509b649..ef50068 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1187,17 +1187,6 @@
}
}
-static inline void complete_buffers(struct bio *bio, int status)
-{
- while (bio) {
- struct bio *xbh = bio->bi_next;
-
- bio->bi_next = NULL;
- bio_endio(bio, status ? 0 : -EIO);
- bio = xbh;
- }
-}
-
static void cciss_check_queues(ctlr_info_t *h)
{
int start_queue = h->next_to_run;
@@ -1263,21 +1252,14 @@
pci_unmap_page(h->pdev, temp64.val, cmd->SG[i].Len, ddir);
}
- complete_buffers(rq->bio, (rq->errors == 0));
-
- if (blk_fs_request(rq)) {
- const int rw = rq_data_dir(rq);
-
- disk_stat_add(rq->rq_disk, sectors[rw], rq->nr_sectors);
- }
-
#ifdef CCISS_DEBUG
printk("Done with %p\n", rq);
#endif /* CCISS_DEBUG */
- add_disk_randomness(rq->rq_disk);
+ if (blk_end_request(rq, (rq->errors == 0) ? 0 : -EIO, blk_rq_bytes(rq)))
+ BUG();
+
spin_lock_irqsave(&h->lock, flags);
- end_that_request_last(rq, (rq->errors == 0));
cmd_free(h, cmd, 1);
cciss_check_queues(h);
spin_unlock_irqrestore(&h->lock, flags);
@@ -2544,7 +2526,6 @@
}
cmd->rq->data_len = 0;
cmd->rq->completion_data = cmd;
- blk_add_trace_rq(cmd->rq->q, cmd->rq, BLK_TA_COMPLETE);
blk_complete_request(cmd->rq);
}
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index c8132d9..6919918 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -167,7 +167,6 @@
static inline void addQ(cmdlist_t **Qptr, cmdlist_t *c);
static inline cmdlist_t *removeQ(cmdlist_t **Qptr, cmdlist_t *c);
-static inline void complete_buffers(struct bio *bio, int ok);
static inline void complete_command(cmdlist_t *cmd, int timeout);
static irqreturn_t do_ida_intr(int irq, void *dev_id);
@@ -980,26 +979,13 @@
}
}
-static inline void complete_buffers(struct bio *bio, int ok)
-{
- struct bio *xbh;
-
- while (bio) {
- xbh = bio->bi_next;
- bio->bi_next = NULL;
-
- bio_endio(bio, ok ? 0 : -EIO);
-
- bio = xbh;
- }
-}
/*
* Mark all buffers that cmd was responsible for
*/
static inline void complete_command(cmdlist_t *cmd, int timeout)
{
struct request *rq = cmd->rq;
- int ok=1;
+ int error = 0;
int i, ddir;
if (cmd->req.hdr.rcode & RCODE_NONFATAL &&
@@ -1011,16 +997,17 @@
if (cmd->req.hdr.rcode & RCODE_FATAL) {
printk(KERN_WARNING "Fatal error on ida/c%dd%d\n",
cmd->ctlr, cmd->hdr.unit);
- ok = 0;
+ error = -EIO;
}
if (cmd->req.hdr.rcode & RCODE_INVREQ) {
printk(KERN_WARNING "Invalid request on ida/c%dd%d = (cmd=%x sect=%d cnt=%d sg=%d ret=%x)\n",
cmd->ctlr, cmd->hdr.unit, cmd->req.hdr.cmd,
cmd->req.hdr.blk, cmd->req.hdr.blk_cnt,
cmd->req.hdr.sg_cnt, cmd->req.hdr.rcode);
- ok = 0;
+ error = -EIO;
}
- if (timeout) ok = 0;
+ if (timeout)
+ error = -EIO;
/* unmap the DMA mapping for all the scatter gather elements */
if (cmd->req.hdr.cmd == IDA_READ)
ddir = PCI_DMA_FROMDEVICE;
@@ -1030,18 +1017,9 @@
pci_unmap_page(hba[cmd->ctlr]->pci_dev, cmd->req.sg[i].addr,
cmd->req.sg[i].size, ddir);
- complete_buffers(rq->bio, ok);
-
- if (blk_fs_request(rq)) {
- const int rw = rq_data_dir(rq);
-
- disk_stat_add(rq->rq_disk, sectors[rw], rq->nr_sectors);
- }
-
- add_disk_randomness(rq->rq_disk);
-
DBGPX(printk("Done with %p\n", rq););
- end_that_request_last(rq, ok ? 1 : -EIO);
+ if (__blk_end_request(rq, error, blk_rq_bytes(rq)))
+ BUG();
}
/*
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 639ed14..32c79a5 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2287,21 +2287,19 @@
* =============================
*/
-static void floppy_end_request(struct request *req, int uptodate)
+static void floppy_end_request(struct request *req, int error)
{
unsigned int nr_sectors = current_count_sectors;
+ unsigned int drive = (unsigned long)req->rq_disk->private_data;
/* current_count_sectors can be zero if transfer failed */
- if (!uptodate)
+ if (error)
nr_sectors = req->current_nr_sectors;
- if (end_that_request_first(req, uptodate, nr_sectors))
+ if (__blk_end_request(req, error, nr_sectors << 9))
return;
- add_disk_randomness(req->rq_disk);
- floppy_off((long)req->rq_disk->private_data);
- blkdev_dequeue_request(req);
- end_that_request_last(req, uptodate);
/* We're done with the request */
+ floppy_off(drive);
current_req = NULL;
}
@@ -2332,7 +2330,7 @@
/* unlock chained buffers */
spin_lock_irqsave(q->queue_lock, flags);
- floppy_end_request(req, 1);
+ floppy_end_request(req, 0);
spin_unlock_irqrestore(q->queue_lock, flags);
} else {
if (rq_data_dir(req) == WRITE) {
@@ -2346,7 +2344,7 @@
DRWE->last_error_generation = DRS->generation;
}
spin_lock_irqsave(q->queue_lock, flags);
- floppy_end_request(req, 0);
+ floppy_end_request(req, -EIO);
spin_unlock_irqrestore(q->queue_lock, flags);
}
}
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index ba9b17e..ae31060 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -100,17 +100,15 @@
static void nbd_end_request(struct request *req)
{
- int uptodate = (req->errors == 0) ? 1 : 0;
+ int error = req->errors ? -EIO : 0;
struct request_queue *q = req->q;
unsigned long flags;
dprintk(DBG_BLKDEV, "%s: request %p: %s\n", req->rq_disk->disk_name,
- req, uptodate? "done": "failed");
+ req, error ? "failed" : "done");
spin_lock_irqsave(q->queue_lock, flags);
- if (!end_that_request_first(req, uptodate, req->nr_sectors)) {
- end_that_request_last(req, uptodate);
- }
+ __blk_end_request(req, error, req->nr_sectors << 9);
spin_unlock_irqrestore(q->queue_lock, flags);
}
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index e354bfc..7483f94 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -229,7 +229,7 @@
struct ps3_storage_device *dev = data;
struct ps3disk_private *priv;
struct request *req;
- int res, read, uptodate;
+ int res, read, error;
u64 tag, status;
unsigned long num_sectors;
const char *op;
@@ -270,21 +270,17 @@
if (status) {
dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
__LINE__, op, status);
- uptodate = 0;
+ error = -EIO;
} else {
dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
__LINE__, op);
- uptodate = 1;
+ error = 0;
if (read)
ps3disk_scatter_gather(dev, req, 0);
}
spin_lock(&priv->lock);
- if (!end_that_request_first(req, uptodate, num_sectors)) {
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, uptodate);
- }
+ __blk_end_request(req, error, num_sectors << 9);
priv->req = NULL;
ps3disk_do_request(dev, priv->queue);
spin_unlock(&priv->lock);
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index fac4c6c..66e30155 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -212,12 +212,9 @@
vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
}
-static void vdc_end_request(struct request *req, int uptodate, int num_sectors)
+static void vdc_end_request(struct request *req, int error, int num_sectors)
{
- if (end_that_request_first(req, uptodate, num_sectors))
- return;
- add_disk_randomness(req->rq_disk);
- end_that_request_last(req, uptodate);
+ __blk_end_request(req, error, num_sectors << 9);
}
static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
@@ -242,7 +239,7 @@
rqe->req = NULL;
- vdc_end_request(req, !desc->status, desc->size >> 9);
+ vdc_end_request(req, (desc->status ? -EIO : 0), desc->size >> 9);
if (blk_queue_stopped(port->disk->queue))
blk_start_queue(port->disk->queue);
@@ -456,7 +453,7 @@
blkdev_dequeue_request(req);
if (__send_request(req) < 0)
- vdc_end_request(req, 0, req->hard_nr_sectors);
+ vdc_end_request(req, -EIO, req->hard_nr_sectors);
}
}
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 52dc5e1..cd5674b 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -744,16 +744,14 @@
static inline void carm_end_request_queued(struct carm_host *host,
struct carm_request *crq,
- int uptodate)
+ int error)
{
struct request *req = crq->rq;
int rc;
- rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
+ rc = __blk_end_request(req, error, blk_rq_bytes(req));
assert(rc == 0);
- end_that_request_last(req, uptodate);
-
rc = carm_put_request(host, crq);
assert(rc == 0);
}
@@ -793,9 +791,9 @@
}
static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
- int is_ok)
+ int error)
{
- carm_end_request_queued(host, crq, is_ok);
+ carm_end_request_queued(host, crq, error);
if (max_queue == 1)
carm_round_robin(host);
else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
@@ -873,14 +871,14 @@
sg = &crq->sg[0];
n_elem = blk_rq_map_sg(q, rq, sg);
if (n_elem <= 0) {
- carm_end_rq(host, crq, 0);
+ carm_end_rq(host, crq, -EIO);
return; /* request with no s/g entries? */
}
/* map scatterlist to PCI bus addresses */
n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
if (n_elem <= 0) {
- carm_end_rq(host, crq, 0);
+ carm_end_rq(host, crq, -EIO);
return; /* request with no s/g entries? */
}
crq->n_elem = n_elem;
@@ -941,7 +939,7 @@
static void carm_handle_array_info(struct carm_host *host,
struct carm_request *crq, u8 *mem,
- int is_ok)
+ int error)
{
struct carm_port *port;
u8 *msg_data = mem + sizeof(struct carm_array_info);
@@ -952,9 +950,9 @@
DPRINTK("ENTER\n");
- carm_end_rq(host, crq, is_ok);
+ carm_end_rq(host, crq, error);
- if (!is_ok)
+ if (error)
goto out;
if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
goto out;
@@ -1001,7 +999,7 @@
static void carm_handle_scan_chan(struct carm_host *host,
struct carm_request *crq, u8 *mem,
- int is_ok)
+ int error)
{
u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
unsigned int i, dev_count = 0;
@@ -1009,9 +1007,9 @@
DPRINTK("ENTER\n");
- carm_end_rq(host, crq, is_ok);
+ carm_end_rq(host, crq, error);
- if (!is_ok) {
+ if (error) {
new_state = HST_ERROR;
goto out;
}
@@ -1033,23 +1031,23 @@
}
static void carm_handle_generic(struct carm_host *host,
- struct carm_request *crq, int is_ok,
+ struct carm_request *crq, int error,
int cur_state, int next_state)
{
DPRINTK("ENTER\n");
- carm_end_rq(host, crq, is_ok);
+ carm_end_rq(host, crq, error);
assert(host->state == cur_state);
- if (is_ok)
- host->state = next_state;
- else
+ if (error)
host->state = HST_ERROR;
+ else
+ host->state = next_state;
schedule_work(&host->fsm_task);
}
static inline void carm_handle_rw(struct carm_host *host,
- struct carm_request *crq, int is_ok)
+ struct carm_request *crq, int error)
{
int pci_dir;
@@ -1062,7 +1060,7 @@
pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
- carm_end_rq(host, crq, is_ok);
+ carm_end_rq(host, crq, error);
}
static inline void carm_handle_resp(struct carm_host *host,
@@ -1071,7 +1069,7 @@
u32 handle = le32_to_cpu(ret_handle_le);
unsigned int msg_idx;
struct carm_request *crq;
- int is_ok = (status == RMSG_OK);
+ int error = (status == RMSG_OK) ? 0 : -EIO;
u8 *mem;
VPRINTK("ENTER, handle == 0x%x\n", handle);
@@ -1090,7 +1088,7 @@
/* fast path */
if (likely(crq->msg_type == CARM_MSG_READ ||
crq->msg_type == CARM_MSG_WRITE)) {
- carm_handle_rw(host, crq, is_ok);
+ carm_handle_rw(host, crq, error);
return;
}
@@ -1100,7 +1098,7 @@
case CARM_MSG_IOCTL: {
switch (crq->msg_subtype) {
case CARM_IOC_SCAN_CHAN:
- carm_handle_scan_chan(host, crq, mem, is_ok);
+ carm_handle_scan_chan(host, crq, mem, error);
break;
default:
/* unknown / invalid response */
@@ -1112,21 +1110,21 @@
case CARM_MSG_MISC: {
switch (crq->msg_subtype) {
case MISC_ALLOC_MEM:
- carm_handle_generic(host, crq, is_ok,
+ carm_handle_generic(host, crq, error,
HST_ALLOC_BUF, HST_SYNC_TIME);
break;
case MISC_SET_TIME:
- carm_handle_generic(host, crq, is_ok,
+ carm_handle_generic(host, crq, error,
HST_SYNC_TIME, HST_GET_FW_VER);
break;
case MISC_GET_FW_VER: {
struct carm_fw_ver *ver = (struct carm_fw_ver *)
mem + sizeof(struct carm_msg_get_fw_ver);
- if (is_ok) {
+ if (!error) {
host->fw_ver = le32_to_cpu(ver->version);
host->flags |= (ver->features & FL_FW_VER_MASK);
}
- carm_handle_generic(host, crq, is_ok,
+ carm_handle_generic(host, crq, error,
HST_GET_FW_VER, HST_PORT_SCAN);
break;
}
@@ -1140,7 +1138,7 @@
case CARM_MSG_ARRAY: {
switch (crq->msg_subtype) {
case CARM_ARRAY_INFO:
- carm_handle_array_info(host, crq, mem, is_ok);
+ carm_handle_array_info(host, crq, mem, error);
break;
default:
/* unknown / invalid response */
@@ -1159,7 +1157,7 @@
err_out:
printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
- carm_end_rq(host, crq, 0);
+ carm_end_rq(host, crq, -EIO);
}
static inline void carm_handle_responses(struct carm_host *host)
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 08e909d..c6179d6 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -808,16 +808,16 @@
static void ub_end_rq(struct request *rq, unsigned int scsi_status)
{
- int uptodate;
+ int error;
if (scsi_status == 0) {
- uptodate = 1;
+ error = 0;
} else {
- uptodate = 0;
+ error = -EIO;
rq->errors = scsi_status;
}
- end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
- end_that_request_last(rq, uptodate);
+ if (__blk_end_request(rq, error, blk_rq_bytes(rq)))
+ BUG();
}
static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index ab5d404..9e61fca 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -229,13 +229,10 @@
/*
* End a request
*/
-static void viodasd_end_request(struct request *req, int uptodate,
+static void viodasd_end_request(struct request *req, int error,
int num_sectors)
{
- if (end_that_request_first(req, uptodate, num_sectors))
- return;
- add_disk_randomness(req->rq_disk);
- end_that_request_last(req, uptodate);
+ __blk_end_request(req, error, num_sectors << 9);
}
/*
@@ -374,12 +371,12 @@
blkdev_dequeue_request(req);
/* check that request contains a valid command */
if (!blk_fs_request(req)) {
- viodasd_end_request(req, 0, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, req->hard_nr_sectors);
continue;
}
/* Try sending the request */
if (send_request(req) != 0)
- viodasd_end_request(req, 0, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, req->hard_nr_sectors);
}
}
@@ -591,7 +588,7 @@
num_req_outstanding--;
spin_unlock_irqrestore(&viodasd_spinlock, irq_flags);
- error = event->xRc != HvLpEvent_Rc_Good;
+ error = (event->xRc == HvLpEvent_Rc_Good) ? 0 : -EIO;
if (error) {
const struct vio_error_entry *err;
err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
@@ -601,7 +598,7 @@
}
qlock = req->q->queue_lock;
spin_lock_irqsave(qlock, irq_flags);
- viodasd_end_request(req, !error, num_sect);
+ viodasd_end_request(req, error, num_sect);
spin_unlock_irqrestore(qlock, irq_flags);
/* Finally, try to get more requests off of this device's queue */
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 2bdebcb..8afce67 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -452,7 +452,7 @@
RING_IDX i, rp;
unsigned long flags;
struct blkfront_info *info = (struct blkfront_info *)dev_id;
- int uptodate;
+ int error;
spin_lock_irqsave(&blkif_io_lock, flags);
@@ -477,13 +477,13 @@
add_id_to_freelist(info, id);
- uptodate = (bret->status == BLKIF_RSP_OKAY);
+ error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
switch (bret->operation) {
case BLKIF_OP_WRITE_BARRIER:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
printk(KERN_WARNING "blkfront: %s: write barrier op failed\n",
info->gd->disk_name);
- uptodate = -EOPNOTSUPP;
+ error = -EOPNOTSUPP;
info->feature_barrier = 0;
xlvbd_barrier(info);
}
@@ -494,10 +494,8 @@
dev_dbg(&info->xbdev->dev, "Bad return from blkdev data "
"request: %x\n", bret->status);
- ret = end_that_request_first(req, uptodate,
- req->hard_nr_sectors);
+ ret = __blk_end_request(req, error, blk_rq_bytes(req));
BUG_ON(ret);
- end_that_request_last(req, uptodate);
break;
default:
BUG();
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index 82effce..2c81465 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -703,7 +703,7 @@
/* bio finished; is there another one? */
i = ace->req->current_nr_sectors;
- if (end_that_request_first(ace->req, 1, i)) {
+ if (__blk_end_request(ace->req, 0, i)) {
/* dev_dbg(ace->dev, "next block; h=%li c=%i\n",
* ace->req->hard_nr_sectors,
* ace->req->current_nr_sectors);
@@ -718,9 +718,6 @@
break;
case ACE_FSM_STATE_REQ_COMPLETE:
- /* Complete the block request */
- blkdev_dequeue_request(ace->req);
- end_that_request_last(ace->req, 1);
ace->req = NULL;
/* Finished request; go to idle state */
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index d8bb44b..8473b9f 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -289,7 +289,7 @@
return 0;
}
-static void viocd_end_request(struct request *req, int uptodate)
+static void viocd_end_request(struct request *req, int error)
{
int nsectors = req->hard_nr_sectors;
@@ -302,11 +302,8 @@
if (!nsectors)
nsectors = 1;
- if (end_that_request_first(req, uptodate, nsectors))
+ if (__blk_end_request(req, error, nsectors << 9))
BUG();
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, uptodate);
}
static int rwreq;
@@ -317,11 +314,11 @@
while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
if (!blk_fs_request(req))
- viocd_end_request(req, 0);
+ viocd_end_request(req, -EIO);
else if (send_request(req) < 0) {
printk(VIOCD_KERN_WARNING
"unable to send message to OS/400!");
- viocd_end_request(req, 0);
+ viocd_end_request(req, -EIO);
} else
rwreq++;
}
@@ -532,9 +529,9 @@
"with rc %d:0x%04X: %s\n",
req, event->xRc,
bevent->sub_result, err->msg);
- viocd_end_request(req, 0);
+ viocd_end_request(req, -EIO);
} else
- viocd_end_request(req, 1);
+ viocd_end_request(req, 0);
/* restart handling of incoming requests */
spin_unlock_irqrestore(&viocd_reqlock, flags);
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 44b033e..74c6087 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -655,9 +655,9 @@
BUG();
} else {
spin_lock_irqsave(&ide_lock, flags);
- end_that_request_chunk(failed, 0,
- failed->data_len);
- end_that_request_last(failed, 0);
+ if (__blk_end_request(failed, -EIO,
+ failed->data_len))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
} else
@@ -1647,6 +1647,17 @@
return 1;
}
+/*
+ * Called from blk_end_request_callback() after the data of the request
+ * is completed and before the request is completed.
+ * By returning value '1', blk_end_request_callback() returns immediately
+ * without completing the request.
+ */
+static int cdrom_newpc_intr_dummy_cb(struct request *rq)
+{
+ return 1;
+}
+
typedef void (xfer_func_t)(ide_drive_t *, void *, u32);
/*
@@ -1685,9 +1696,13 @@
return ide_error(drive, "dma error", stat);
}
- end_that_request_chunk(rq, 1, rq->data_len);
- rq->data_len = 0;
- goto end_request;
+ spin_lock_irqsave(&ide_lock, flags);
+ if (__blk_end_request(rq, 0, rq->data_len))
+ BUG();
+ HWGROUP(drive)->rq = NULL;
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+ return ide_stopped;
}
/*
@@ -1705,8 +1720,15 @@
/*
* If DRQ is clear, the command has completed.
*/
- if ((stat & DRQ_STAT) == 0)
- goto end_request;
+ if ((stat & DRQ_STAT) == 0) {
+ spin_lock_irqsave(&ide_lock, flags);
+ if (__blk_end_request(rq, 0, 0))
+ BUG();
+ HWGROUP(drive)->rq = NULL;
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+ return ide_stopped;
+ }
/*
* check which way to transfer data
@@ -1759,7 +1781,14 @@
rq->data_len -= blen;
if (rq->bio)
- end_that_request_chunk(rq, 1, blen);
+ /*
+ * The request can't be completed until DRQ is cleared.
+ * So complete the data, but don't complete the request
+ * using the dummy function for the callback feature
+ * of blk_end_request_callback().
+ */
+ blk_end_request_callback(rq, 0, blen,
+ cdrom_newpc_intr_dummy_cb);
else
rq->data += blen;
}
@@ -1780,14 +1809,6 @@
ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, NULL);
return ide_started;
-
-end_request:
- spin_lock_irqsave(&ide_lock, flags);
- blkdev_dequeue_request(rq);
- end_that_request_last(rq, 1);
- HWGROUP(drive)->rq = NULL;
- spin_unlock_irqrestore(&ide_lock, flags);
- return ide_stopped;
}
static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 6f8f544..e6bb9cf 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -58,15 +58,19 @@
int uptodate, unsigned int nr_bytes, int dequeue)
{
int ret = 1;
+ int error = 0;
+
+ if (uptodate <= 0)
+ error = uptodate ? uptodate : -EIO;
/*
* if failfast is set on a request, override number of sectors and
* complete the whole request right now
*/
- if (blk_noretry_request(rq) && end_io_error(uptodate))
+ if (blk_noretry_request(rq) && error)
nr_bytes = rq->hard_nr_sectors << 9;
- if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors)
+ if (!blk_fs_request(rq) && error && !rq->errors)
rq->errors = -EIO;
/*
@@ -78,14 +82,9 @@
ide_dma_on(drive);
}
- if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
- add_disk_randomness(rq->rq_disk);
- if (dequeue) {
- if (!list_empty(&rq->queuelist))
- blkdev_dequeue_request(rq);
+ if (!__blk_end_request(rq, error, nr_bytes)) {
+ if (dequeue)
HWGROUP(drive)->rq = NULL;
- }
- end_that_request_last(rq, uptodate);
ret = 0;
}
@@ -290,9 +289,9 @@
drive->blocked = 0;
blk_start_queue(drive->queue);
}
- blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
- end_that_request_last(rq, 1);
+ if (__blk_end_request(rq, 0, 0))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
@@ -387,10 +386,10 @@
}
spin_lock_irqsave(&ide_lock, flags);
- blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
rq->errors = err;
- end_that_request_last(rq, !rq->errors);
+ if (__blk_end_request(rq, (rq->errors ? -EIO : 0), 0))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index e4ad7a1..a953148 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -412,13 +412,13 @@
/**
* i2o_block_end_request - Post-processing of completed commands
* @req: request which should be completed
- * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
+ * @error: 0 for success, < 0 for error
* @nr_bytes: number of bytes to complete
*
* Mark the request as complete. The lock must not be held when entering.
*
*/
-static void i2o_block_end_request(struct request *req, int uptodate,
+static void i2o_block_end_request(struct request *req, int error,
int nr_bytes)
{
struct i2o_block_request *ireq = req->special;
@@ -426,22 +426,18 @@
struct request_queue *q = req->q;
unsigned long flags;
- if (end_that_request_chunk(req, uptodate, nr_bytes)) {
+ if (blk_end_request(req, error, nr_bytes)) {
int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT);
if (blk_pc_request(req))
leftover = req->data_len;
- if (end_io_error(uptodate))
- end_that_request_chunk(req, 0, leftover);
+ if (error)
+ blk_end_request(req, -EIO, leftover);
}
- add_disk_randomness(req->rq_disk);
-
spin_lock_irqsave(q->queue_lock, flags);
- end_that_request_last(req, uptodate);
-
if (likely(dev)) {
dev->open_queue_depth--;
list_del(&ireq->queue);
@@ -468,7 +464,7 @@
struct i2o_message *msg)
{
struct request *req;
- int uptodate = 1;
+ int error = 0;
req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
if (unlikely(!req)) {
@@ -501,10 +497,10 @@
req->errors++;
- uptodate = 0;
+ error = -EIO;
}
- i2o_block_end_request(req, uptodate, le32_to_cpu(msg->body[1]));
+ i2o_block_end_request(req, error, le32_to_cpu(msg->body[1]));
return 1;
};
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index aeb32a9..91ded3e 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -348,15 +348,7 @@
* A block was successfully transferred.
*/
spin_lock_irq(&md->lock);
- ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
- if (!ret) {
- /*
- * The whole request completed successfully.
- */
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, 1);
- }
+ ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
spin_unlock_irq(&md->lock);
} while (ret);
@@ -386,27 +378,21 @@
else
bytes = blocks << 9;
spin_lock_irq(&md->lock);
- ret = end_that_request_chunk(req, 1, bytes);
+ ret = __blk_end_request(req, 0, bytes);
spin_unlock_irq(&md->lock);
}
} else if (rq_data_dir(req) != READ &&
(card->host->caps & MMC_CAP_MULTIWRITE)) {
spin_lock_irq(&md->lock);
- ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
+ ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
spin_unlock_irq(&md->lock);
}
mmc_release_host(card->host);
spin_lock_irq(&md->lock);
- while (ret) {
- ret = end_that_request_chunk(req, 0,
- req->current_nr_sectors << 9);
- }
-
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, 0);
+ while (ret)
+ ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
spin_unlock_irq(&md->lock);
return 0;
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 30cd13b..7731dde 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -94,8 +94,8 @@
printk(KERN_ERR "MMC: killing requests for dead queue\n");
while ((req = elv_next_request(q)) != NULL) {
do {
- ret = end_that_request_chunk(req, 0,
- req->current_nr_sectors << 9);
+ ret = __blk_end_request(req, -EIO,
+ blk_rq_cur_bytes(req));
} while (ret);
}
return;
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 1db15f3..d640427 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1595,12 +1595,10 @@
/*
* posts the buffer_cache about a finalized request
*/
-static inline void dasd_end_request(struct request *req, int uptodate)
+static inline void dasd_end_request(struct request *req, int error)
{
- if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
+ if (__blk_end_request(req, error, blk_rq_bytes(req)))
BUG();
- add_disk_randomness(req->rq_disk);
- end_that_request_last(req, uptodate);
}
/*
@@ -1657,7 +1655,7 @@
"Rejecting write request %p",
req);
blkdev_dequeue_request(req);
- dasd_end_request(req, 0);
+ dasd_end_request(req, -EIO);
continue;
}
cqr = basedev->discipline->build_cp(basedev, block, req);
@@ -1686,7 +1684,7 @@
"on request %p",
PTR_ERR(cqr), req);
blkdev_dequeue_request(req);
- dasd_end_request(req, 0);
+ dasd_end_request(req, -EIO);
continue;
}
/*
@@ -1705,11 +1703,14 @@
{
struct request *req;
int status;
+ int error = 0;
req = (struct request *) cqr->callback_data;
dasd_profile_end(cqr->block, cqr, req);
status = cqr->memdev->discipline->free_cp(cqr, req);
- dasd_end_request(req, status);
+ if (status <= 0)
+ error = status ? status : -EIO;
+ dasd_end_request(req, error);
}
/*
@@ -2009,7 +2010,7 @@
spin_lock_irq(&block->request_queue_lock);
while ((req = elv_next_request(block->request_queue))) {
blkdev_dequeue_request(req);
- dasd_end_request(req, 0);
+ dasd_end_request(req, -EIO);
}
spin_unlock_irq(&block->request_queue_lock);
}
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index eeb92e2..ddc4a11 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -74,11 +74,10 @@
* Post finished request.
*/
static void
-tapeblock_end_request(struct request *req, int uptodate)
+tapeblock_end_request(struct request *req, int error)
{
- if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
+ if (__blk_end_request(req, error, blk_rq_bytes(req)))
BUG();
- end_that_request_last(req, uptodate);
}
static void
@@ -91,7 +90,7 @@
device = ccw_req->device;
req = (struct request *) data;
- tapeblock_end_request(req, ccw_req->rc == 0);
+ tapeblock_end_request(req, (ccw_req->rc == 0) ? 0 : -EIO);
if (ccw_req->rc == 0)
/* Update position. */
device->blk_data.block_position =
@@ -119,7 +118,7 @@
ccw_req = device->discipline->bread(device, req);
if (IS_ERR(ccw_req)) {
DBF_EVENT(1, "TBLOCK: bread failed\n");
- tapeblock_end_request(req, 0);
+ tapeblock_end_request(req, -EIO);
return PTR_ERR(ccw_req);
}
ccw_req->callback = __tapeblock_end_request;
@@ -132,7 +131,7 @@
* Start/enqueueing failed. No retries in
* this case.
*/
- tapeblock_end_request(req, 0);
+ tapeblock_end_request(req, -EIO);
device->discipline->free_bread(ccw_req);
}
@@ -177,7 +176,7 @@
if (rq_data_dir(req) == WRITE) {
DBF_EVENT(1, "TBLOCK: Rejecting write request\n");
blkdev_dequeue_request(req);
- tapeblock_end_request(req, 0);
+ tapeblock_end_request(req, -EIO);
continue;
}
spin_unlock_irq(&device->blk_data.request_queue_lock);
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 02e9189..db8bc20 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -919,8 +919,8 @@
}
/* kill current request */
- blkdev_dequeue_request(req);
- end_that_request_last(req, 0);
+ if (__blk_end_request(req, -EIO, 0))
+ BUG();
if (blk_sense_request(req))
kfree(scsi->pc->buffer);
kfree(scsi->pc);
@@ -929,8 +929,8 @@
/* now nuke the drive queue */
while ((req = elv_next_request(drive->queue))) {
- blkdev_dequeue_request(req);
- end_that_request_last(req, 0);
+ if (__blk_end_request(req, -EIO, 0))
+ BUG();
}
HWGROUP(drive)->rq = NULL;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index eb4911a..7c4c889 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -634,7 +634,7 @@
* of upper level post-processing and scsi_io_completion).
*
* Arguments: cmd - command that is complete.
- * uptodate - 1 if I/O indicates success, <= 0 for I/O error.
+ * error - 0 if I/O indicates success, < 0 for I/O error.
* bytes - number of bytes of completed I/O
* requeue - indicates whether we should requeue leftovers.
*
@@ -649,26 +649,25 @@
* at some point during this call.
* Notes: If cmd was requeued, upon return it will be a stale pointer.
*/
-static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate,
+static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
int bytes, int requeue)
{
struct request_queue *q = cmd->device->request_queue;
struct request *req = cmd->request;
- unsigned long flags;
/*
* If there are blocks left over at the end, set up the command
* to queue the remainder of them.
*/
- if (end_that_request_chunk(req, uptodate, bytes)) {
+ if (blk_end_request(req, error, bytes)) {
int leftover = (req->hard_nr_sectors << 9);
if (blk_pc_request(req))
leftover = req->data_len;
/* kill remainder if no retrys */
- if (!uptodate && blk_noretry_request(req))
- end_that_request_chunk(req, 0, leftover);
+ if (error && blk_noretry_request(req))
+ blk_end_request(req, error, leftover);
else {
if (requeue) {
/*
@@ -683,14 +682,6 @@
}
}
- add_disk_randomness(req->rq_disk);
-
- spin_lock_irqsave(q->queue_lock, flags);
- if (blk_rq_tagged(req))
- blk_queue_end_tag(q, req);
- end_that_request_last(req, uptodate);
- spin_unlock_irqrestore(q->queue_lock, flags);
-
/*
* This will goose the queue request function at the end, so we don't
* need to worry about launching another command.
@@ -892,7 +883,7 @@
* are leftovers and there is some kind of error
* (result != 0), retry the rest.
*/
- if (scsi_end_request(cmd, 1, good_bytes, result == 0) == NULL)
+ if (scsi_end_request(cmd, 0, good_bytes, result == 0) == NULL)
return;
/* good_bytes = 0, or (inclusive) there were leftovers and
@@ -906,7 +897,7 @@
* and quietly refuse further access.
*/
cmd->device->changed = 1;
- scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, -EIO, this_count, 1);
return;
} else {
/* Must have been a power glitch, or a
@@ -938,7 +929,7 @@
scsi_requeue_command(q, cmd);
return;
} else {
- scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, -EIO, this_count, 1);
return;
}
break;
@@ -966,7 +957,7 @@
"Device not ready",
&sshdr);
- scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, -EIO, this_count, 1);
return;
case VOLUME_OVERFLOW:
if (!(req->cmd_flags & REQ_QUIET)) {
@@ -976,7 +967,7 @@
scsi_print_sense("", cmd);
}
/* See SSC3rXX or current. */
- scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, -EIO, this_count, 1);
return;
default:
break;
@@ -997,7 +988,7 @@
scsi_print_sense("", cmd);
}
}
- scsi_end_request(cmd, 0, this_count, !result);
+ scsi_end_request(cmd, -EIO, this_count, !result);
}
/*
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2483a05..b71c390 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -464,6 +464,8 @@
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
+/* rq->queuelist of dequeued request must be list_empty() */
+#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
@@ -643,29 +645,32 @@
}
/*
- * end_request() and friends. Must be called with the request queue spinlock
- * acquired. All functions called within end_request() _must_be_ atomic.
+ * blk_end_request() and friends.
+ * __blk_end_request() and end_request() must be called with
+ * the request queue spinlock acquired.
*
* Several drivers define their own end_request and call
- * end_that_request_first() and end_that_request_last()
- * for parts of the original function. This prevents
- * code duplication in drivers.
+ * blk_end_request() for parts of the original function.
+ * This prevents code duplication in drivers.
*/
-extern int end_that_request_first(struct request *, int, int);
-extern int end_that_request_chunk(struct request *, int, int);
-extern void end_that_request_last(struct request *, int);
+extern int blk_end_request(struct request *rq, int error, int nr_bytes);
+extern int __blk_end_request(struct request *rq, int error, int nr_bytes);
+extern int blk_end_bidi_request(struct request *rq, int error, int nr_bytes,
+ int bidi_bytes);
extern void end_request(struct request *, int);
extern void end_queued_request(struct request *, int);
extern void end_dequeued_request(struct request *, int);
+extern int blk_end_request_callback(struct request *rq, int error, int nr_bytes,
+ int (drv_callback)(struct request *));
extern void blk_complete_request(struct request *);
/*
- * end_that_request_first/chunk() takes an uptodate argument. we account
- * any value <= as an io error. 0 means -EIO for compatability reasons,
- * any other < 0 value is the direct error type. An uptodate value of
- * 1 indicates successful io completion
+ * 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.
*/
-#define end_io_error(uptodate) (unlikely((uptodate) <= 0))
+extern unsigned int blk_rq_bytes(struct request *rq);
+extern unsigned int blk_rq_cur_bytes(struct request *rq);
static inline void blkdev_dequeue_request(struct request *req)
{