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authorAndy Grover <agrover@redhat.com>2011-07-20 19:13:28 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2011-07-22 09:37:48 +0000
commit05d1c7c0d0db4cc25548d9aadebb416888a82327 (patch)
tree290243526d188a7f6a683b0e13a63c7207471fa1 /drivers/target/target_core_pr.c
parente22a7f075226c51f3f71b922e9eeb4f99fac1475 (diff)
target: Make all control CDBs scatter-gather
Previously, some control CDBs did not allocate memory in pages for their data buffer, but just did a kmalloc. This patch makes all cdbs allocate pages. This has the benefit of streamlining some paths that had to behave differently when we used two allocation methods. The downside is that all accesses to the data buffer need to kmap it before use, and need to handle data in page-sized chunks if more than a page is needed for a given command's data buffer. Finally, note that cdbs with no data buffers are handled a little differently. Before, SCSI_NON_DATA_CDBs would not call get_mem at all (they'd be in the final else in transport_allocate_resources) but now these will make it into generic_get_mem, but just not allocate any buffers. Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_pr.c')
-rw-r--r--drivers/target/target_core_pr.c60
1 files changed, 49 insertions, 11 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 4fdede8da0c..3342843f861 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -1482,7 +1482,7 @@ static int core_scsi3_decode_spec_i_port(
struct list_head tid_dest_list;
struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
struct target_core_fabric_ops *tmp_tf_ops;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tpdl, tid_len = 0;
@@ -1524,6 +1524,8 @@ static int core_scsi3_decode_spec_i_port(
*/
tidh_new->dest_local_nexus = 1;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
+
+ buf = transport_kmap_first_data_page(cmd);
/*
* For a PERSISTENT RESERVE OUT specify initiator ports payload,
* first extract TransportID Parameter Data Length, and make sure
@@ -1760,6 +1762,9 @@ static int core_scsi3_decode_spec_i_port(
tid_len = 0;
}
+
+ transport_kunmap_first_data_page(cmd);
+
/*
* Go ahead and create a registrations from tid_dest_list for the
* SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
@@ -1806,6 +1811,7 @@ static int core_scsi3_decode_spec_i_port(
return 0;
out:
+ transport_kunmap_first_data_page(cmd);
/*
* For the failure case, release everything from tid_dest_list
* including *dest_pr_reg and the configfs dependances..
@@ -3307,7 +3313,7 @@ static int core_scsi3_emulate_pro_register_and_move(
struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
unsigned char *initiator_str;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tid_len, tmp_tid_len;
@@ -3357,17 +3363,21 @@ static int core_scsi3_emulate_pro_register_and_move(
core_scsi3_put_pr_reg(pr_reg);
return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
}
+
/*
* Determine the Relative Target Port Identifier where the reservation
* will be moved to for the TransportID containing SCSI initiator WWN
* information.
*/
+ buf = transport_kmap_first_data_page(cmd);
rtpi = (buf[18] & 0xff) << 8;
rtpi |= buf[19] & 0xff;
tid_len = (buf[20] & 0xff) << 24;
tid_len |= (buf[21] & 0xff) << 16;
tid_len |= (buf[22] & 0xff) << 8;
tid_len |= buf[23] & 0xff;
+ transport_kunmap_first_data_page(cmd);
+ buf = NULL;
if ((tid_len + 24) != cmd->data_length) {
printk(KERN_ERR "SPC-3 PR: Illegal tid_len: %u + 24 byte header"
@@ -3414,6 +3424,8 @@ static int core_scsi3_emulate_pro_register_and_move(
core_scsi3_put_pr_reg(pr_reg);
return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
}
+
+ buf = transport_kmap_first_data_page(cmd);
proto_ident = (buf[24] & 0x0f);
#if 0
printk("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
@@ -3444,6 +3456,9 @@ static int core_scsi3_emulate_pro_register_and_move(
goto out;
}
+ transport_kunmap_first_data_page(cmd);
+ buf = NULL;
+
printk(KERN_INFO "SPC-3 PR [%s] Extracted initiator %s identifier: %s"
" %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
"port" : "device", initiator_str, (iport_ptr != NULL) ?
@@ -3696,9 +3711,13 @@ after_iport_check:
" REGISTER_AND_MOVE\n");
}
+ transport_kunmap_first_data_page(cmd);
+
core_scsi3_put_pr_reg(dest_pr_reg);
return 0;
out:
+ if (buf)
+ transport_kunmap_first_data_page(cmd);
if (dest_se_deve)
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (dest_node_acl)
@@ -3723,7 +3742,7 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
*/
static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
{
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
u64 res_key, sa_res_key;
int sa, scope, type, aptpl;
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
@@ -3745,6 +3764,8 @@ static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
sa = (cdb[1] & 0x1f);
scope = (cdb[2] & 0xf0);
type = (cdb[2] & 0x0f);
+
+ buf = transport_kmap_first_data_page(cmd);
/*
* From PERSISTENT_RESERVE_OUT parameter list (payload)
*/
@@ -3762,6 +3783,9 @@ static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
aptpl = (buf[17] & 0x01);
unreg = (buf[17] & 0x02);
}
+ transport_kunmap_first_data_page(cmd);
+ buf = NULL;
+
/*
* SPEC_I_PT=1 is only valid for Service action: REGISTER
*/
@@ -3830,7 +3854,7 @@ static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
u32 add_len = 0, off = 8;
if (cmd->data_length < 8) {
@@ -3839,6 +3863,7 @@ static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
+ buf = transport_kmap_first_data_page(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
@@ -3872,6 +3897,8 @@ static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
+ transport_kunmap_first_data_page(cmd);
+
return 0;
}
@@ -3885,7 +3912,7 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
u64 pr_res_key;
u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
@@ -3895,6 +3922,7 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
+ buf = transport_kmap_first_data_page(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
@@ -3911,10 +3939,9 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
- if (cmd->data_length < 22) {
- spin_unlock(&se_dev->dev_reservation_lock);
- return 0;
- }
+ if (cmd->data_length < 22)
+ goto err;
+
/*
* Set the Reservation key.
*
@@ -3951,7 +3978,10 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
buf[21] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
}
+
+err:
spin_unlock(&se_dev->dev_reservation_lock);
+ transport_kunmap_first_data_page(cmd);
return 0;
}
@@ -3965,7 +3995,7 @@ static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
u16 add_len = 8; /* Hardcoded to 8. */
if (cmd->data_length < 6) {
@@ -3974,6 +4004,8 @@ static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
+ buf = transport_kmap_first_data_page(cmd);
+
buf[0] = ((add_len << 8) & 0xff);
buf[1] = (add_len & 0xff);
buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
@@ -4004,6 +4036,8 @@ static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
+ transport_kunmap_first_data_page(cmd);
+
return 0;
}
@@ -4020,7 +4054,7 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
- unsigned char *buf = (unsigned char *)cmd->t_task_buf;
+ unsigned char *buf;
u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
u32 off = 8; /* off into first Full Status descriptor */
int format_code = 0;
@@ -4031,6 +4065,8 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
+ buf = transport_kmap_first_data_page(cmd);
+
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
@@ -4150,6 +4186,8 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
+ transport_kunmap_first_data_page(cmd);
+
return 0;
}