From: Boaz Harrosh <[EMAIL PROTECTED]>
Date: Thu, 13 Dec 2007 13:50:53 +0200
Subject: [SCSI] bidirectional command support
At the block level bidi request uses req->next_rq pointer for a second
bidi_read request.
At Scsi-midlayer a second scsi_data_buffer structure is used for the
bidi_read part. This bidi scsi_data_buffer is put on
request->next_rq->special. Struct scsi_cmnd is not changed.
- Define scsi_bidi_cmnd() to return true if it is a bidi request and a
second sgtable was allocated.
- Define scsi_in()/scsi_out() to return the in or out scsi_data_buffer
from this command This API is to isolate users from the mechanics of
bidi.
- Define scsi_end_bidi_request() to do what scsi_end_request() does but
for a bidi request. This is necessary because bidi commands are a bit
tricky here. (See comments in body)
- scsi_release_buffers() will also release the bidi_read scsi_data_buffer
- scsi_io_completion() on bidi commands will now call
scsi_end_bidi_request() and return.
- The previous work done in scsi_init_io() is now done in a new
scsi_init_sgtable() (which is 99% identical to old scsi_init_io())
The new scsi_init_io() will call the above twice if needed also for
the bidi_read command. Only at this point is a command bidi.
- In scsi_error.c at scsi_eh_prep/restore_cmnd() make sure bidi-lld is not
confused by a get-sense command that looks like bidi. This is done
by puting NULL at request->next_rq, and restoring.
[jejb: update to sg_table and resolve conflicts]
Signed-off-by: Boaz Harrosh <[EMAIL PROTECTED]>
Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
drivers/scsi/scsi_error.c | 3 +
drivers/scsi/scsi_lib.c | 144 ++++++++++++++++++++++++++++++++++++---------
include/scsi/scsi_cmnd.h | 23 +++++++-
include/scsi/scsi_eh.h | 1 +
4 files changed, 141 insertions(+), 30 deletions(-)
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 8752a9f..65d02e8 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -618,9 +618,11 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct
scsi_eh_save *ses,
memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
ses->data_direction = scmd->sc_data_direction;
ses->sdb = scmd->sdb;
+ ses->next_rq = scmd->request->next_rq;
ses->result = scmd->result;
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
+ scmd->request->next_rq = NULL;
if (sense_bytes) {
scmd->sdb.length = min_t(unsigned,
@@ -673,6 +675,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct
scsi_eh_save *ses)
memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
scmd->sc_data_direction = ses->data_direction;
scmd->sdb = ses->sdb;
+ scmd->request->next_rq = ses->next_rq;
scmd->result = ses->result;
}
EXPORT_SYMBOL(scsi_eh_restore_cmnd);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 90d5ee0..3c681de 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -64,6 +64,8 @@ static struct scsi_host_sg_pool scsi_sg_pools[] = {
};
#undef SP
+static struct kmem_cache *scsi_bidi_sdb_cache;
+
static void scsi_run_queue(struct request_queue *q);
/*
@@ -627,6 +629,28 @@ void scsi_run_host_queues(struct Scsi_Host *shost)
scsi_run_queue(sdev->request_queue);
}
+static void scsi_finalize_request(struct scsi_cmnd *cmd, int uptodate)
+{
+ struct request_queue *q = cmd->device->request_queue;
+ struct request *req = cmd->request;
+ unsigned long flags;
+
+ 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.
+ */
+ scsi_next_command(cmd);
+}
+
/*
* Function: scsi_end_request()
*
@@ -654,7 +678,6 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd
*cmd, int uptodate,
{
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
@@ -683,19 +706,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd
*cmd, int uptodate,
}
}
- 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.
- */
- scsi_next_command(cmd);
+ scsi_finalize_request(cmd, uptodate);
return NULL;
}
@@ -797,10 +808,39 @@ void scsi_release_buffers(struct scsi_cmnd *cmd)
scsi_free_sgtable(&cmd->sdb);
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
+
+ if (scsi_bidi_cmnd(cmd)) {
+ struct scsi_data_buffer *bidi_sdb =
+ cmd->request->next_rq->special;
+ scsi_free_sgtable(bidi_sdb);
+ kmem_cache_free(scsi_bidi_sdb_cache, bidi_sdb);
+ cmd->request->next_rq->special = NULL;
+ }
}
EXPORT_SYMBOL(scsi_release_buffers);
/*
+ * Bidi commands Must be complete as a whole, both sides at once.
+ * If part of the bytes were written and lld returned
+ * scsi_in()->resid and/or scsi_out()->resid this information will be left
+ * in req->data_len and req->next_rq->data_len. The upper-layer driver can
+ * decide what to do with this information.
+ */
+void scsi_end_bidi_request(struct scsi_cmnd *cmd)
+{
+ struct request *req = cmd->request;
+
+ end_that_request_chunk(req, 1, req->data_len);
+ req->data_len = scsi_out(cmd)->resid;
+
+ end_that_request_chunk(req->next_rq, 1, req->next_rq->data_len);
+ req->next_rq->data_len = scsi_in(cmd)->resid;
+
+ scsi_release_buffers(cmd);
+ scsi_finalize_request(cmd, 1);
+}
+
+/*
* Function: scsi_io_completion()
*
* Purpose: Completion processing for block device I/O requests.
@@ -861,9 +901,15 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned
int good_bytes)
req->sense_len = len;
}
}
+ if (scsi_bidi_cmnd(cmd)) {
+ /* will also release_buffers */
+ scsi_end_bidi_request(cmd);
+ return;
+ }
req->data_len = scsi_get_resid(cmd);
}
+ BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
scsi_release_buffers(cmd);
/*
@@ -989,28 +1035,16 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned
int good_bytes)
scsi_end_request(cmd, 0, this_count, !result);
}
-/*
- * Function: scsi_init_io()
- *
- * Purpose: SCSI I/O initialize function.
- *
- * Arguments: cmd - Command descriptor we wish to initialize
- *
- * Returns: 0 on success
- * BLKPREP_DEFER if the failure is retryable
- */
-int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
+ gfp_t gfp_mask)
{
- struct request *req = cmd->request;
- int count;
- struct scsi_data_buffer *sdb = &cmd->sdb;
+ int count;
/*
* If sg table allocation fails, requeue request later.
*/
if (unlikely(scsi_alloc_sgtable(sdb, req->nr_phys_segments,
gfp_mask))) {
- scsi_unprep_request(req);
return BLKPREP_DEFER;
}
@@ -1029,6 +1063,50 @@ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
sdb->table.nents = count;
return BLKPREP_OK;
}
+
+/*
+ * Function: scsi_init_io()
+ *
+ * Purpose: SCSI I/O initialize function.
+ *
+ * Arguments: cmd - Command descriptor we wish to initialize
+ *
+ * Returns: 0 on success
+ * BLKPREP_DEFER if the failure is retryable
+ * BLKPREP_KILL if the failure is fatal
+ */
+int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+{
+ int error = scsi_init_sgtable(cmd->request, &cmd->sdb, gfp_mask);
+ if (error)
+ goto err_exit;
+
+ if (blk_bidi_rq(cmd->request)) {
+ struct scsi_data_buffer *bidi_sdb = kmem_cache_zalloc(
+ scsi_bidi_sdb_cache, GFP_ATOMIC);
+ if (!bidi_sdb) {
+ error = BLKPREP_DEFER;
+ goto err_exit;
+ }
+
+ cmd->request->next_rq->special = bidi_sdb;
+ error = scsi_init_sgtable(cmd->request->next_rq, bidi_sdb,
+ GFP_ATOMIC);
+ if (error)
+ goto err_exit;
+ }
+
+ return BLKPREP_OK ;
+
+err_exit:
+ scsi_release_buffers(cmd);
+ if (error == BLKPREP_KILL)
+ scsi_put_command(cmd);
+ else /* BLKPREP_DEFER */
+ scsi_unprep_request(cmd->request);
+
+ return error;
+}
EXPORT_SYMBOL(scsi_init_io);
static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
@@ -1646,6 +1724,14 @@ int __init scsi_init_queue(void)
return -ENOMEM;
}
+ scsi_bidi_sdb_cache = kmem_cache_create("scsi_bidi_sdb",
+ sizeof(struct scsi_data_buffer),
+ 0, 0, NULL);
+ if (!scsi_bidi_sdb_cache) {
+ printk(KERN_ERR "SCSI: can't init scsi bidi sdb cache\n");
+ return -ENOMEM;
+ }
+
for (i = 0; i < SG_MEMPOOL_NR; i++) {
struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
int size = sgp->size * sizeof(struct scatterlist);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index d95f0bf..90d8c5a 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -2,12 +2,12 @@
#define _SCSI_SCSI_CMND_H
#include <linux/dma-mapping.h>
+#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/scatterlist.h>
-struct request;
struct Scsi_Host;
struct scsi_device;
@@ -158,4 +158,25 @@ static inline int scsi_get_resid(struct scsi_cmnd *cmd)
#define scsi_for_each_sg(cmd, sg, nseg, __i) \
for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
+static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
+{
+ return blk_bidi_rq(cmd->request) &&
+ (cmd->request->next_rq->special != NULL);
+}
+
+static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
+{
+ WARN_ON((cmd->sc_data_direction != DMA_FROM_DEVICE) &&
+ !scsi_bidi_cmnd(cmd));
+ return scsi_bidi_cmnd(cmd) ?
+ cmd->request->next_rq->special : &cmd->sdb;
+}
+
+static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
+{
+ WARN_ON((cmd->sc_data_direction != DMA_TO_DEVICE) &&
+ !scsi_bidi_cmnd(cmd));
+ return &cmd->sdb;
+}
+
#endif /* _SCSI_SCSI_CMND_H */
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 1e08be1..25071d5 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -74,6 +74,7 @@ struct scsi_eh_save {
unsigned char cmd_len;
unsigned char cmnd[MAX_COMMAND_SIZE];
struct scsi_data_buffer sdb;
+ struct request *next_rq;
/* new command support */
struct scatterlist sense_sgl;
--
1.5.3.7
-
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