diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/Kconfig | 23 | ||||
| -rw-r--r-- | block/Makefile | 2 | ||||
| -rw-r--r-- | block/bsg.c | 95 |
3 files changed, 5 insertions, 115 deletions
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 df21df106d3b..3dbfd2c6aef3 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; @@ -487,17 +404,7 @@ unlock: 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; |