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path: root/drivers/target/target_core_pscsi.c
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Diffstat (limited to 'drivers/target/target_core_pscsi.c')
-rw-r--r--drivers/target/target_core_pscsi.c310
1 files changed, 133 insertions, 177 deletions
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 7c69b4a9694d..db4e09042469 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
* Filename: target_core_pscsi.c
*
@@ -7,20 +8,6 @@
*
* Nicholas A. Bellinger <nab@kernel.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
******************************************************************************/
#include <linux/string.h>
@@ -30,11 +17,10 @@
#include <linux/blk_types.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/genhd.h>
#include <linux/cdrom.h>
#include <linux/ratelimit.h>
#include <linux/module.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
@@ -47,15 +33,13 @@
#include "target_core_internal.h"
#include "target_core_pscsi.h"
-#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
-
static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
{
return container_of(dev, struct pscsi_dev_virt, dev);
}
static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
-static void pscsi_req_done(struct request *, blk_status_t);
+static enum rq_end_io_ret pscsi_req_done(struct request *, blk_status_t);
/* pscsi_attach_hba():
*
@@ -160,8 +144,7 @@ static void pscsi_tape_read_blocksize(struct se_device *dev,
cdb[0] = MODE_SENSE;
cdb[4] = 0x0c; /* 12 bytes */
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
- HZ, 1, NULL);
+ ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf, 12, HZ, 1, NULL);
if (ret)
goto out_free;
@@ -179,20 +162,20 @@ out_free:
static void
pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
{
- unsigned char *buf;
-
if (sdev->inquiry_len < INQUIRY_LEN)
return;
-
- buf = sdev->inquiry;
- if (!buf)
- return;
/*
- * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
+ * Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun()
*/
- memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
- memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
- memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
+ BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1);
+ snprintf(wwn->vendor, sizeof(wwn->vendor),
+ "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor);
+ BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1);
+ snprintf(wwn->model, sizeof(wwn->model),
+ "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model);
+ BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1);
+ snprintf(wwn->revision, sizeof(wwn->revision),
+ "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev);
}
static int
@@ -211,8 +194,8 @@ pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
cdb[2] = 0x80; /* Unit Serial Number */
put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]);
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
- INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
+ ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf,
+ INQUIRY_VPD_SERIAL_LEN, HZ, 1, NULL);
if (ret)
goto out_free;
@@ -246,9 +229,8 @@ pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
cdb[2] = 0x83; /* Device Identifier */
put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]);
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
- INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
- NULL, HZ, 1, NULL);
+ ret = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, buf,
+ INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, HZ, 1, NULL);
if (ret)
goto out;
@@ -370,7 +352,7 @@ static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
struct Scsi_Host *sh = sd->host;
- struct block_device *bd;
+ struct file *bdev_file;
int ret;
if (scsi_device_get(sd)) {
@@ -384,18 +366,18 @@ static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
* Claim exclusive struct block_device access to struct scsi_device
* for TYPE_DISK and TYPE_ZBC using supplied udev_path
*/
- bd = blkdev_get_by_path(dev->udev_path,
- FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
- if (IS_ERR(bd)) {
- pr_err("pSCSI: blkdev_get_by_path() failed\n");
+ bdev_file = bdev_file_open_by_path(dev->udev_path,
+ BLK_OPEN_WRITE | BLK_OPEN_READ, pdv, NULL);
+ if (IS_ERR(bdev_file)) {
+ pr_err("pSCSI: bdev_file_open_by_path() failed\n");
scsi_device_put(sd);
- return PTR_ERR(bd);
+ return PTR_ERR(bdev_file);
}
- pdv->pdv_bd = bd;
+ pdv->pdv_bdev_file = bdev_file;
ret = pscsi_add_device_to_list(dev, sd);
if (ret) {
- blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+ fput(bdev_file);
scsi_device_put(sd);
return ret;
}
@@ -516,7 +498,7 @@ static int pscsi_configure_device(struct se_device *dev)
continue;
/*
* Functions will release the held struct scsi_host->host_lock
- * before calling calling pscsi_add_device_to_list() to register
+ * before calling pscsi_add_device_to_list() to register
* struct scsi_device with target_core_mod.
*/
switch (sd->type) {
@@ -582,10 +564,9 @@ static void pscsi_destroy_device(struct se_device *dev)
* from pscsi_create_type_disk()
*/
if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) &&
- pdv->pdv_bd) {
- blkdev_put(pdv->pdv_bd,
- FMODE_WRITE|FMODE_READ|FMODE_EXCL);
- pdv->pdv_bd = NULL;
+ pdv->pdv_bdev_file) {
+ fput(pdv->pdv_bdev_file);
+ pdv->pdv_bdev_file = NULL;
}
/*
* For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
@@ -604,20 +585,18 @@ static void pscsi_destroy_device(struct se_device *dev)
}
static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
- unsigned char *req_sense)
+ unsigned char *req_sense, int valid_data)
{
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
struct scsi_device *sd = pdv->pdv_sd;
- struct pscsi_plugin_task *pt = cmd->priv;
- unsigned char *cdb;
+ unsigned char *cdb = cmd->priv;
+
/*
- * Special case for REPORT_LUNs handling where pscsi_plugin_task has
- * not been allocated because TCM is handling the emulation directly.
+ * Special case for REPORT_LUNs which is emulated and not passed on.
*/
- if (!pt)
+ if (!cdb)
return;
- cdb = &pt->pscsi_cdb[0];
/*
* Hack to make sure that Write-Protect modepage is set if R/O mode is
* forced.
@@ -633,18 +612,19 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
unsigned char *buf;
buf = transport_kmap_data_sg(cmd);
- if (!buf)
+ if (!buf) {
; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
-
- if (cdb[0] == MODE_SENSE_10) {
- if (!(buf[3] & 0x80))
- buf[3] |= 0x80;
} else {
- if (!(buf[2] & 0x80))
- buf[2] |= 0x80;
- }
+ if (cdb[0] == MODE_SENSE_10) {
+ if (!(buf[3] & 0x80))
+ buf[3] |= 0x80;
+ } else {
+ if (!(buf[2] & 0x80))
+ buf[2] |= 0x80;
+ }
- transport_kunmap_data_sg(cmd);
+ transport_kunmap_data_sg(cmd);
+ }
}
}
after_mode_sense:
@@ -689,8 +669,29 @@ after_mode_sense:
}
after_mode_select:
- if (scsi_status == SAM_STAT_CHECK_CONDITION)
+ if (scsi_status == SAM_STAT_CHECK_CONDITION) {
transport_copy_sense_to_cmd(cmd, req_sense);
+
+ /*
+ * check for TAPE device reads with
+ * FM/EOM/ILI set, so that we can get data
+ * back despite framework assumption that a
+ * check condition means there is no data
+ */
+ if (sd->type == TYPE_TAPE && valid_data &&
+ cmd->data_direction == DMA_FROM_DEVICE) {
+ /*
+ * is sense data valid, fixed format,
+ * and have FM, EOM, or ILI set?
+ */
+ if (req_sense[0] == 0xf0 && /* valid, fixed format */
+ req_sense[2] & 0xe0 && /* FM, EOM, or ILI */
+ (req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */
+ pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n");
+ cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL;
+ }
+ }
+ }
}
enum {
@@ -790,7 +791,6 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
struct scsi_device *sd = pdv->pdv_sd;
unsigned char host_id[16];
ssize_t bl;
- int i;
if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
snprintf(host_id, 16, "%d", pdv->pdv_host_id);
@@ -803,60 +803,26 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
host_id);
if (sd) {
- bl += sprintf(b + bl, " ");
- bl += sprintf(b + bl, "Vendor: ");
- for (i = 0; i < 8; i++) {
- if (ISPRINT(sd->vendor[i])) /* printable character? */
- bl += sprintf(b + bl, "%c", sd->vendor[i]);
- else
- bl += sprintf(b + bl, " ");
- }
- bl += sprintf(b + bl, " Model: ");
- for (i = 0; i < 16; i++) {
- if (ISPRINT(sd->model[i])) /* printable character ? */
- bl += sprintf(b + bl, "%c", sd->model[i]);
- else
- bl += sprintf(b + bl, " ");
- }
- bl += sprintf(b + bl, " Rev: ");
- for (i = 0; i < 4; i++) {
- if (ISPRINT(sd->rev[i])) /* printable character ? */
- bl += sprintf(b + bl, "%c", sd->rev[i]);
- else
- bl += sprintf(b + bl, " ");
- }
- bl += sprintf(b + bl, "\n");
+ bl += sprintf(b + bl, " Vendor: %."
+ __stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor);
+ bl += sprintf(b + bl, " Model: %."
+ __stringify(INQUIRY_MODEL_LEN) "s", sd->model);
+ bl += sprintf(b + bl, " Rev: %."
+ __stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev);
}
return bl;
}
static void pscsi_bi_endio(struct bio *bio)
{
- bio_put(bio);
-}
-
-static inline struct bio *pscsi_get_bio(int nr_vecs)
-{
- struct bio *bio;
- /*
- * Use bio_malloc() following the comment in for bio -> struct request
- * in block/blk-core.c:blk_make_request()
- */
- bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
- if (!bio) {
- pr_err("PSCSI: bio_kmalloc() failed\n");
- return NULL;
- }
- bio->bi_end_io = pscsi_bi_endio;
-
- return bio;
+ bio_uninit(bio);
+ kfree(bio);
}
static sense_reason_t
pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
struct request *req)
{
- struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
struct bio *bio = NULL;
struct page *page;
struct scatterlist *sg;
@@ -890,29 +856,25 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
bytes = min(bytes, data_len);
if (!bio) {
- nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
- nr_pages -= nr_vecs;
- /*
- * Calls bio_kmalloc() and sets bio->bi_end_io()
- */
- bio = pscsi_get_bio(nr_vecs);
+new_bio:
+ nr_vecs = bio_max_segs(nr_pages);
+ bio = bio_kmalloc(nr_vecs, GFP_KERNEL);
if (!bio)
goto fail;
-
- if (rw)
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
+ bio_init_inline(bio, NULL, nr_vecs,
+ rw ? REQ_OP_WRITE : REQ_OP_READ);
+ bio->bi_end_io = pscsi_bi_endio;
pr_debug("PSCSI: Allocated bio: %p,"
" dir: %s nr_vecs: %d\n", bio,
(rw) ? "rw" : "r", nr_vecs);
}
- pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
+ pr_debug("PSCSI: Calling bio_add_page() i: %d"
" bio: %p page: %p len: %d off: %d\n", i, bio,
page, len, off);
- rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
- bio, page, bytes, off);
+ rc = bio_add_page(bio, page, bytes, off);
pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
bio_segments(bio), nr_vecs);
if (rc != bytes) {
@@ -926,11 +888,7 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
goto fail;
}
- /*
- * Clear the pointer so that another bio will
- * be allocated with pscsi_get_bio() above.
- */
- bio = NULL;
+ goto new_bio;
}
data_len -= bytes;
@@ -947,6 +905,17 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
return 0;
fail:
+ if (bio) {
+ bio_uninit(bio);
+ kfree(bio);
+ }
+ while (req->bio) {
+ bio = req->bio;
+ req->bio = bio->bi_next;
+ bio_uninit(bio);
+ kfree(bio);
+ }
+ req->biotail = NULL;
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
@@ -965,32 +934,15 @@ pscsi_execute_cmd(struct se_cmd *cmd)
struct scatterlist *sgl = cmd->t_data_sg;
u32 sgl_nents = cmd->t_data_nents;
struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
- struct pscsi_plugin_task *pt;
+ struct scsi_cmnd *scmd;
struct request *req;
sense_reason_t ret;
- /*
- * Dynamically alloc cdb space, since it may be larger than
- * TCM_MAX_COMMAND_SIZE
- */
- pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
- if (!pt) {
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- }
- cmd->priv = pt;
-
- memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
- scsi_command_size(cmd->t_task_cdb));
-
- req = blk_get_request(pdv->pdv_sd->request_queue,
+ req = scsi_alloc_request(pdv->pdv_sd->request_queue,
cmd->data_direction == DMA_TO_DEVICE ?
- REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
- GFP_KERNEL);
- if (IS_ERR(req)) {
- pr_err("PSCSI: blk_get_request() failed\n");
- ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- goto fail;
- }
+ REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
+ if (IS_ERR(req))
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (sgl) {
ret = pscsi_map_sg(cmd, sgl, sgl_nents, req);
@@ -1000,25 +952,30 @@ pscsi_execute_cmd(struct se_cmd *cmd)
req->end_io = pscsi_req_done;
req->end_io_data = cmd;
- scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb);
- scsi_req(req)->cmd = &pt->pscsi_cdb[0];
+
+ scmd = blk_mq_rq_to_pdu(req);
+ scmd->cmd_len = scsi_command_size(cmd->t_task_cdb);
+ if (scmd->cmd_len > sizeof(scmd->cmnd)) {
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto fail_put_request;
+ }
+ memcpy(scmd->cmnd, cmd->t_task_cdb, scmd->cmd_len);
+
if (pdv->pdv_sd->type == TYPE_DISK ||
pdv->pdv_sd->type == TYPE_ZBC)
req->timeout = PS_TIMEOUT_DISK;
else
req->timeout = PS_TIMEOUT_OTHER;
- scsi_req(req)->retries = PS_RETRY;
+ scmd->allowed = PS_RETRY;
- blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
- (cmd->sam_task_attr == TCM_HEAD_TAG),
- pscsi_req_done);
+ cmd->priv = scmd->cmnd;
+
+ blk_execute_rq_nowait(req, cmd->sam_task_attr == TCM_HEAD_TAG);
return 0;
fail_put_request:
- blk_put_request(req);
-fail:
- kfree(pt);
+ blk_mq_free_request(req);
return ret;
}
@@ -1038,49 +995,48 @@ static sector_t pscsi_get_blocks(struct se_device *dev)
{
struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
- return pdv->pdv_bd->bd_part->nr_sects;
-
+ if (pdv->pdv_bdev_file)
+ return bdev_nr_sectors(file_bdev(pdv->pdv_bdev_file));
return 0;
}
-static void pscsi_req_done(struct request *req, blk_status_t status)
+static enum rq_end_io_ret pscsi_req_done(struct request *req,
+ blk_status_t status)
{
struct se_cmd *cmd = req->end_io_data;
- struct pscsi_plugin_task *pt = cmd->priv;
- int result = scsi_req(req)->result;
- u8 scsi_status = status_byte(result) << 1;
+ struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req);
+ enum sam_status scsi_status = scmd->result & 0xff;
+ int valid_data = cmd->data_length - scmd->resid_len;
+ u8 *cdb = cmd->priv;
- if (scsi_status) {
+ if (scsi_status != SAM_STAT_GOOD) {
pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
+ " 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
}
- pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense);
+ pscsi_complete_cmd(cmd, scsi_status, scmd->sense_buffer, valid_data);
- switch (host_byte(result)) {
+ switch (host_byte(scmd->result)) {
case DID_OK:
- target_complete_cmd(cmd, scsi_status);
+ target_complete_cmd_with_length(cmd, scsi_status, valid_data);
break;
default:
pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
+ " 0x%02x Result: 0x%08x\n", cmd, cdb[0], scmd->result);
target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
break;
}
- __blk_put_request(req->q, req);
- kfree(pt);
+ blk_mq_free_request(req);
+ return RQ_END_IO_NONE;
}
static const struct target_backend_ops pscsi_ops = {
.name = "pscsi",
.owner = THIS_MODULE,
- .transport_flags = TRANSPORT_FLAG_PASSTHROUGH |
- TRANSPORT_FLAG_PASSTHROUGH_ALUA |
- TRANSPORT_FLAG_PASSTHROUGH_PGR,
+ .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH |
+ TRANSPORT_FLAG_PASSTHROUGH_ALUA |
+ TRANSPORT_FLAG_PASSTHROUGH_PGR,
.attach_hba = pscsi_attach_hba,
.detach_hba = pscsi_detach_hba,
.pmode_enable_hba = pscsi_pmode_enable_hba,