Move the SCSI-specific bsg code in the SCSI midlayer instead of in the
common bsg code. This just keeps the common bsg code block/ and also
allows building it as a module.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/Kconfig | 23 ++--------
block/Makefile | 2 +-
block/bsg.c | 95 +---------------------------------------
drivers/scsi/Kconfig | 13 ++++++
drivers/scsi/Makefile | 1 +
drivers/scsi/scsi_bsg.c | 95 ++++++++++++++++++++++++++++++++++++++++
drivers/scsi/scsi_priv.h | 10 +++++
include/linux/blkdev.h | 2 +-
include/linux/bsg.h | 11 ++---
9 files changed, 128 insertions(+), 124 deletions(-)
create mode 100644 drivers/scsi/scsi_bsg.c
diff --git a/block/Kconfig b/block/Kconfig
index fd732aede922..88aa88241795 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -35,29 +35,12 @@ config BLK_SCSI_REQUEST
config BLK_CGROUP_RWSTAT
bool
-config BLK_DEV_BSG
- bool "Block layer SG support v4"
- default y
- select BLK_SCSI_REQUEST
- help
- Saying Y here will enable generic SG (SCSI generic) v4 support
- for any block device.
-
- Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
- can handle complicated SCSI commands: tagged variable length cdbs
- with bidirectional data transfers and generic request/response
- protocols (e.g. Task Management Functions and SMP in Serial
- Attached SCSI).
-
- This option is required by recent UDEV versions to properly
- access device serial numbers, etc.
-
- If unsure, say Y.
+config BLK_DEV_BSG_COMMON
+ tristate
config BLK_DEV_BSGLIB
bool "Block layer SG support v4 helper lib"
- select BLK_DEV_BSG
- select BLK_SCSI_REQUEST
+ select BLK_DEV_BSG_COMMON
help
Subsystems will normally enable this if needed. Users will not
normally need to manually enable this.
diff --git a/block/Makefile b/block/Makefile
index bfbe4e13ca1e..f37d532c8da5 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-sysfs.o \
obj-$(CONFIG_BOUNCE) += bounce.o
obj-$(CONFIG_BLK_SCSI_REQUEST) += scsi_ioctl.o
-obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
+obj-$(CONFIG_BLK_DEV_BSG_COMMON) += bsg.o
obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o
obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o
obj-$(CONFIG_BLK_CGROUP_RWSTAT) += blk-cgroup-rwstat.o
diff --git a/block/bsg.c b/block/bsg.c
index e51459011467..6062c0931530 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -15,9 +15,6 @@
#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_driver.h>
#include <scsi/sg.h>
#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver"
@@ -54,86 +51,6 @@ static inline struct hlist_head *bsg_dev_idx_hash(int index)
#define uptr64(val) ((void __user *)(uintptr_t)(val))
-static int bsg_scsi_check_proto(struct sg_io_v4 *hdr)
-{
- if (hdr->protocol != BSG_PROTOCOL_SCSI ||
- hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
- return -EINVAL;
- return 0;
-}
-
-static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
- fmode_t mode)
-{
- struct scsi_request *sreq = scsi_req(rq);
-
- if (hdr->dout_xfer_len && hdr->din_xfer_len) {
- pr_warn_once("BIDI support in bsg has been removed.\n");
- return -EOPNOTSUPP;
- }
-
- sreq->cmd_len = hdr->request_len;
- if (sreq->cmd_len > BLK_MAX_CDB) {
- sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
- if (!sreq->cmd)
- return -ENOMEM;
- }
-
- if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
- return -EFAULT;
- if (blk_verify_command(sreq->cmd, mode))
- return -EPERM;
- return 0;
-}
-
-static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
-{
- struct scsi_request *sreq = scsi_req(rq);
- int ret = 0;
-
- /*
- * fill in all the output members
- */
- hdr->device_status = sreq->result & 0xff;
- hdr->transport_status = host_byte(sreq->result);
- hdr->driver_status = 0;
- if (scsi_status_is_check_condition(sreq->result))
- hdr->driver_status = DRIVER_SENSE;
- hdr->info = 0;
- if (hdr->device_status || hdr->transport_status || hdr->driver_status)
- hdr->info |= SG_INFO_CHECK;
- hdr->response_len = 0;
-
- if (sreq->sense_len && hdr->response) {
- int len = min_t(unsigned int, hdr->max_response_len,
- sreq->sense_len);
-
- if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
- ret = -EFAULT;
- else
- hdr->response_len = len;
- }
-
- if (rq_data_dir(rq) == READ)
- hdr->din_resid = sreq->resid_len;
- else
- hdr->dout_resid = sreq->resid_len;
-
- return ret;
-}
-
-static void bsg_scsi_free_rq(struct request *rq)
-{
- scsi_req_free_cmd(scsi_req(rq));
-}
-
-static const struct bsg_ops bsg_scsi_ops = {
- .check_proto = bsg_scsi_check_proto,
- .fill_hdr = bsg_scsi_fill_hdr,
- .complete_rq = bsg_scsi_complete_rq,
- .free_rq = bsg_scsi_free_rq,
-};
-
static int bsg_sg_io(struct request_queue *q, fmode_t mode, void __user *uarg)
{
struct request *rq;
@@ -486,17 +403,7 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
mutex_unlock(&bsg_mutex);
return ret;
}
-
-int bsg_scsi_register_queue(struct request_queue *q, struct device *parent)
-{
- if (!blk_queue_scsi_passthrough(q)) {
- WARN_ONCE(true, "Attempt to register a non-SCSI queue\n");
- return -EINVAL;
- }
-
- return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops);
-}
-EXPORT_SYMBOL_GPL(bsg_scsi_register_queue);
+EXPORT_SYMBOL_GPL(bsg_register_queue);
static struct cdev bsg_cdev;
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8f44d433e06e..86ecab196dfd 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -20,6 +20,7 @@ config SCSI
select SCSI_DMA if HAS_DMA
select SG_POOL
select BLK_SCSI_REQUEST
+ select BLK_DEV_BSG_COMMON if BLK_DEV_BSG
help
If you want to use a SCSI hard disk, SCSI tape drive, SCSI CD-ROM or
any other SCSI device under Linux, say Y and make sure that you know
@@ -140,6 +141,18 @@ config CHR_DEV_SG
If unsure, say N.
+config BLK_DEV_BSG
+ bool "/dev/bsg support (SG v4)"
+ depends on SCSI
+ default y
+ help
+ Saying Y here will enable generic SG (SCSI generic) v4 support
+ for any SCSI device.
+
+ This option is required by UDEV to access device serial numbers, etc.
+
+ If unsure, say Y.
+
config CHR_DEV_SCH
tristate "SCSI media changer support"
depends on SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 1748d1ec1338..240b831b5a11 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -168,6 +168,7 @@ scsi_mod-$(CONFIG_BLK_DEBUG_FS) += scsi_debugfs.o
scsi_mod-y += scsi_trace.o scsi_logging.o
scsi_mod-$(CONFIG_PM) += scsi_pm.o
scsi_mod-$(CONFIG_SCSI_DH) += scsi_dh.o
+scsi_mod-$(CONFIG_BLK_DEV_BSG) += scsi_bsg.o
hv_storvsc-y := storvsc_drv.o
diff --git a/drivers/scsi/scsi_bsg.c b/drivers/scsi/scsi_bsg.c
new file mode 100644
index 000000000000..ac5be941f5e8
--- /dev/null
+++ b/drivers/scsi/scsi_bsg.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bsg.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/sg.h>
+#include "scsi_priv.h"
+
+#define uptr64(val) ((void __user *)(uintptr_t)(val))
+
+static int bsg_scsi_check_proto(struct sg_io_v4 *hdr)
+{
+ if (hdr->protocol != BSG_PROTOCOL_SCSI ||
+ hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD)
+ return -EINVAL;
+ return 0;
+}
+
+static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
+ fmode_t mode)
+{
+ struct scsi_request *sreq = scsi_req(rq);
+
+ if (hdr->dout_xfer_len && hdr->din_xfer_len) {
+ pr_warn_once("BIDI support in bsg has been removed.\n");
+ return -EOPNOTSUPP;
+ }
+
+ sreq->cmd_len = hdr->request_len;
+ if (sreq->cmd_len > BLK_MAX_CDB) {
+ sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
+ if (!sreq->cmd)
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len))
+ return -EFAULT;
+ if (blk_verify_command(sreq->cmd, mode))
+ return -EPERM;
+ return 0;
+}
+
+static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
+{
+ struct scsi_request *sreq = scsi_req(rq);
+ int ret = 0;
+
+ /*
+ * fill in all the output members
+ */
+ hdr->device_status = sreq->result & 0xff;
+ hdr->transport_status = host_byte(sreq->result);
+ hdr->driver_status = 0;
+ if (scsi_status_is_check_condition(sreq->result))
+ hdr->driver_status = DRIVER_SENSE;
+ hdr->info = 0;
+ if (hdr->device_status || hdr->transport_status || hdr->driver_status)
+ hdr->info |= SG_INFO_CHECK;
+ hdr->response_len = 0;
+
+ if (sreq->sense_len && hdr->response) {
+ int len = min_t(unsigned int, hdr->max_response_len,
+ sreq->sense_len);
+
+ if (copy_to_user(uptr64(hdr->response), sreq->sense, len))
+ ret = -EFAULT;
+ else
+ hdr->response_len = len;
+ }
+
+ if (rq_data_dir(rq) == READ)
+ hdr->din_resid = sreq->resid_len;
+ else
+ hdr->dout_resid = sreq->resid_len;
+
+ return ret;
+}
+
+static void bsg_scsi_free_rq(struct request *rq)
+{
+ scsi_req_free_cmd(scsi_req(rq));
+}
+
+static const struct bsg_ops bsg_scsi_ops = {
+ .check_proto = bsg_scsi_check_proto,
+ .fill_hdr = bsg_scsi_fill_hdr,
+ .complete_rq = bsg_scsi_complete_rq,
+ .free_rq = bsg_scsi_free_rq,
+};
+
+int bsg_scsi_register_queue(struct request_queue *q, struct device *parent)
+{
+ return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops);
+}
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 75d6f23e4fff..cb3cc7d41037 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -181,6 +181,16 @@ static inline void scsi_dh_add_device(struct scsi_device *sdev) { }
static inline void scsi_dh_release_device(struct scsi_device *sdev) { }
#endif
+#ifdef CONFIG_BLK_DEV_BSG
+int bsg_scsi_register_queue(struct request_queue *q, struct device *parent);
+#else
+static inline int bsg_scsi_register_queue(struct request_queue *q,
+ struct device *parent)
+{
+ return 0;
+}
+#endif
+
extern int scsi_device_max_queue_depth(struct scsi_device *sdev);
/*
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c983cd8ecf98..b525481abfed 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -537,7 +537,7 @@ struct request_queue {
int mq_freeze_depth;
-#if defined(CONFIG_BLK_DEV_BSG)
+#if defined(CONFIG_BLK_DEV_BSG_COMMON)
struct bsg_class_device bsg_dev;
#endif
diff --git a/include/linux/bsg.h b/include/linux/bsg.h
index dac37b6e00ec..b887da20bd41 100644
--- a/include/linux/bsg.h
+++ b/include/linux/bsg.h
@@ -5,8 +5,9 @@
#include <uapi/linux/bsg.h>
struct request;
+struct request_queue;
-#ifdef CONFIG_BLK_DEV_BSG
+#ifdef CONFIG_BLK_DEV_BSG_COMMON
struct bsg_ops {
int (*check_proto)(struct sg_io_v4 *hdr);
int (*fill_hdr)(struct request *rq, struct sg_io_v4 *hdr,
@@ -24,16 +25,10 @@ struct bsg_class_device {
int bsg_register_queue(struct request_queue *q, struct device *parent,
const char *name, const struct bsg_ops *ops);
-int bsg_scsi_register_queue(struct request_queue *q, struct device *parent);
void bsg_unregister_queue(struct request_queue *q);
#else
-static inline int bsg_scsi_register_queue(struct request_queue *q,
- struct device *parent)
-{
- return 0;
-}
static inline void bsg_unregister_queue(struct request_queue *q)
{
}
-#endif /* CONFIG_BLK_DEV_BSG */
+#endif /* CONFIG_BLK_DEV_BSG_COMMON */
#endif /* _LINUX_BSG_H */
--
2.30.2
