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-rw-r--r--drivers/target/iscsi/iscsi_target.c51
-rw-r--r--drivers/target/iscsi/iscsi_target_configfs.c1
-rw-r--r--drivers/target/iscsi/iscsi_target_login.c1
-rw-r--r--drivers/target/target_core_configfs.c54
-rw-r--r--drivers/target/target_core_device.c38
-rw-r--r--drivers/target/target_core_file.c32
-rw-r--r--drivers/target/target_core_iblock.c12
-rw-r--r--drivers/target/target_core_iblock.h3
-rw-r--r--drivers/target/target_core_pr.c2
-rw-r--r--drivers/target/target_core_pr.h9
-rw-r--r--drivers/target/target_core_pscsi.c3
-rw-r--r--drivers/target/target_core_rd.c50
-rw-r--r--drivers/target/target_core_sbc.c10
-rw-r--r--drivers/target/target_core_tpg.c7
-rw-r--r--drivers/target/target_core_transport.c2
-rw-r--r--drivers/target/target_core_user.c645
16 files changed, 682 insertions, 238 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index e3f9ed3690b7..26a9bcd5ee6a 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -128,11 +128,9 @@ struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
return ERR_PTR(-EINVAL);
}
- tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
- if (!tiqn) {
- pr_err("Unable to allocate struct iscsi_tiqn\n");
+ tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
+ if (!tiqn)
return ERR_PTR(-ENOMEM);
- }
sprintf(tiqn->tiqn, "%s", buf);
INIT_LIST_HEAD(&tiqn->tiqn_list);
@@ -362,9 +360,8 @@ struct iscsi_np *iscsit_add_np(
return np;
}
- np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
+ np = kzalloc(sizeof(*np), GFP_KERNEL);
if (!np) {
- pr_err("Unable to allocate memory for struct iscsi_np\n");
mutex_unlock(&np_lock);
return ERR_PTR(-ENOMEM);
}
@@ -696,12 +693,10 @@ static int __init iscsi_target_init_module(void)
int ret = 0, size;
pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
-
- iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
- if (!iscsit_global) {
- pr_err("Unable to allocate memory for iscsit_global\n");
+ iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
+ if (!iscsit_global)
return -1;
- }
+
spin_lock_init(&iscsit_global->ts_bitmap_lock);
mutex_init(&auth_id_lock);
spin_lock_init(&sess_idr_lock);
@@ -714,10 +709,8 @@ static int __init iscsi_target_init_module(void)
size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
iscsit_global->ts_bitmap = vzalloc(size);
- if (!iscsit_global->ts_bitmap) {
- pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
+ if (!iscsit_global->ts_bitmap)
goto configfs_out;
- }
lio_qr_cache = kmem_cache_create("lio_qr_cache",
sizeof(struct iscsi_queue_req),
@@ -984,12 +977,9 @@ static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
iov_count += ISCSI_IOV_DATA_BUFFER;
-
- cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
- if (!cmd->iov_data) {
- pr_err("Unable to allocate cmd->iov_data\n");
+ cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
+ if (!cmd->iov_data)
return -ENOMEM;
- }
cmd->orig_iov_data_count = iov_count;
return 0;
@@ -1850,8 +1840,6 @@ static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
if (!ping_data) {
- pr_err("Unable to allocate memory for"
- " NOPOUT ping data.\n");
ret = -1;
goto out;
}
@@ -1997,15 +1985,11 @@ iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
cmd->data_direction = DMA_NONE;
-
- cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
- if (!cmd->tmr_req) {
- pr_err("Unable to allocate memory for"
- " Task Management command!\n");
+ cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
+ if (!cmd->tmr_req)
return iscsit_add_reject_cmd(cmd,
ISCSI_REASON_BOOKMARK_NO_RESOURCES,
buf);
- }
/*
* TASK_REASSIGN for ERL=2 / connection stays inside of
@@ -2265,11 +2249,9 @@ iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct kvec iov[3];
text_in = kzalloc(payload_length, GFP_KERNEL);
- if (!text_in) {
- pr_err("Unable to allocate memory for"
- " incoming text parameters\n");
+ if (!text_in)
goto reject;
- }
+
cmd->text_in_ptr = text_in;
memset(iov, 0, 3 * sizeof(struct kvec));
@@ -3353,11 +3335,9 @@ iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
SENDTARGETS_BUF_LIMIT);
payload = kzalloc(buffer_len, GFP_KERNEL);
- if (!payload) {
- pr_err("Unable to allocate memory for sendtargets"
- " response.\n");
+ if (!payload)
return -ENOMEM;
- }
+
/*
* Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
* explicit case..
@@ -4683,6 +4663,7 @@ int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
continue;
}
atomic_set(&sess->session_reinstatement, 1);
+ atomic_set(&sess->session_fall_back_to_erl0, 1);
spin_unlock(&sess->conn_lock);
list_move_tail(&se_sess->sess_list, &free_list);
diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index 5798810197ec..535a8e06a401 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1506,6 +1506,7 @@ static void lio_tpg_close_session(struct se_session *se_sess)
return;
}
atomic_set(&sess->session_reinstatement, 1);
+ atomic_set(&sess->session_fall_back_to_erl0, 1);
spin_unlock(&sess->conn_lock);
iscsit_stop_time2retain_timer(sess);
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index ad8f3011bdc2..66238477137b 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -208,6 +208,7 @@ int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
initiatorname_param->value) &&
(sess_p->sess_ops->SessionType == sessiontype))) {
atomic_set(&sess_p->session_reinstatement, 1);
+ atomic_set(&sess_p->session_fall_back_to_erl0, 1);
spin_unlock(&sess_p->conn_lock);
iscsit_inc_session_usage_count(sess_p);
iscsit_stop_time2retain_timer(sess_p);
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 70657fd56440..0326607e5ab8 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -533,6 +533,7 @@ DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_format);
+DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
@@ -823,6 +824,7 @@ static ssize_t pi_prot_type_store(struct config_item *item,
ret = dev->transport->init_prot(dev);
if (ret) {
da->pi_prot_type = old_prot;
+ da->pi_prot_verify = (bool) da->pi_prot_type;
return ret;
}
@@ -830,6 +832,7 @@ static ssize_t pi_prot_type_store(struct config_item *item,
dev->transport->free_prot(dev);
}
+ da->pi_prot_verify = (bool) da->pi_prot_type;
pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
return count;
}
@@ -872,6 +875,35 @@ static ssize_t pi_prot_format_store(struct config_item *item,
return count;
}
+static ssize_t pi_prot_verify_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_dev_attrib *da = to_attrib(item);
+ bool flag;
+ int ret;
+
+ ret = strtobool(page, &flag);
+ if (ret < 0)
+ return ret;
+
+ if (!flag) {
+ da->pi_prot_verify = flag;
+ return count;
+ }
+ if (da->hw_pi_prot_type) {
+ pr_warn("DIF protection enabled on underlying hardware,"
+ " ignoring\n");
+ return count;
+ }
+ if (!da->pi_prot_type) {
+ pr_warn("DIF protection not supported by backend, ignoring\n");
+ return count;
+ }
+ da->pi_prot_verify = flag;
+
+ return count;
+}
+
static ssize_t force_pr_aptpl_store(struct config_item *item,
const char *page, size_t count)
{
@@ -1067,6 +1099,7 @@ CONFIGFS_ATTR(, emulate_3pc);
CONFIGFS_ATTR(, pi_prot_type);
CONFIGFS_ATTR_RO(, hw_pi_prot_type);
CONFIGFS_ATTR(, pi_prot_format);
+CONFIGFS_ATTR(, pi_prot_verify);
CONFIGFS_ATTR(, enforce_pr_isids);
CONFIGFS_ATTR(, is_nonrot);
CONFIGFS_ATTR(, emulate_rest_reord);
@@ -1104,6 +1137,7 @@ struct configfs_attribute *sbc_attrib_attrs[] = {
&attr_pi_prot_type,
&attr_hw_pi_prot_type,
&attr_pi_prot_format,
+ &attr_pi_prot_verify,
&attr_enforce_pr_isids,
&attr_is_nonrot,
&attr_emulate_rest_reord,
@@ -1366,7 +1400,7 @@ static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
struct se_device *dev = pr_to_dev(item);
int ret;
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return sprintf(page, "Passthrough\n");
spin_lock(&dev->dev_reservation_lock);
@@ -1506,7 +1540,7 @@ static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
{
struct se_device *dev = pr_to_dev(item);
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return sprintf(page, "SPC_PASSTHROUGH\n");
else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
return sprintf(page, "SPC2_RESERVATIONS\n");
@@ -1519,7 +1553,7 @@ static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
{
struct se_device *dev = pr_to_dev(item);
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
return sprintf(page, "APTPL Bit Status: %s\n",
@@ -1531,7 +1565,7 @@ static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
{
struct se_device *dev = pr_to_dev(item);
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
return sprintf(page, "Ready to process PR APTPL metadata..\n");
@@ -1577,7 +1611,7 @@ static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
u16 tpgt = 0;
u8 type = 0;
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return count;
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
return count;
@@ -2511,7 +2545,7 @@ static ssize_t target_tg_pt_gp_alua_support_##_name##_store( \
int ret; \
\
if (!t->tg_pt_gp_valid_id) { \
- pr_err("Unable to do set ##_name ALUA state on non" \
+ pr_err("Unable to do set " #_name " ALUA state on non" \
" valid tg_pt_gp ID: %hu\n", \
t->tg_pt_gp_valid_id); \
return -EINVAL; \
@@ -2643,13 +2677,13 @@ static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
ret = kstrtoul(page, 0, &tg_pt_gp_id);
if (ret < 0) {
- pr_err("kstrtoul() returned %d for"
- " tg_pt_gp_id\n", ret);
+ pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
+ page);
return ret;
}
if (tg_pt_gp_id > 0x0000ffff) {
- pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum:"
- " 0x0000ffff\n", tg_pt_gp_id);
+ pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
+ tg_pt_gp_id);
return -EINVAL;
}
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index d2f089cfa9ae..8add07f387f9 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1045,6 +1045,8 @@ passthrough_parse_cdb(struct se_cmd *cmd,
sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
{
unsigned char *cdb = cmd->t_task_cdb;
+ struct se_device *dev = cmd->se_dev;
+ unsigned int size;
/*
* Clear a lun set in the cdb if the initiator talking to use spoke
@@ -1076,6 +1078,42 @@ passthrough_parse_cdb(struct se_cmd *cmd,
return TCM_NO_SENSE;
}
+ /*
+ * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
+ * emulate the response, since tcmu does not have the information
+ * required to process these commands.
+ */
+ if (!(dev->transport->transport_flags &
+ TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
+ if (cdb[0] == PERSISTENT_RESERVE_IN) {
+ cmd->execute_cmd = target_scsi3_emulate_pr_in;
+ size = (cdb[7] << 8) + cdb[8];
+ return target_cmd_size_check(cmd, size);
+ }
+ if (cdb[0] == PERSISTENT_RESERVE_OUT) {
+ cmd->execute_cmd = target_scsi3_emulate_pr_out;
+ size = (cdb[7] << 8) + cdb[8];
+ return target_cmd_size_check(cmd, size);
+ }
+
+ if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
+ cmd->execute_cmd = target_scsi2_reservation_release;
+ if (cdb[0] == RELEASE_10)
+ size = (cdb[7] << 8) | cdb[8];
+ else
+ size = cmd->data_length;
+ return target_cmd_size_check(cmd, size);
+ }
+ if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
+ cmd->execute_cmd = target_scsi2_reservation_reserve;
+ if (cdb[0] == RESERVE_10)
+ size = (cdb[7] << 8) | cdb[8];
+ else
+ size = cmd->data_length;
+ return target_cmd_size_check(cmd, size);
+ }
+ }
+
/* Set DATA_CDB flag for ops that should have it */
switch (cdb[0]) {
case READ_6:
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 87aa376a1a1a..73b8f93a5fef 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -277,12 +277,11 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
else
ret = vfs_iter_read(fd, &iter, &pos);
- kfree(bvec);
-
if (is_write) {
if (ret < 0 || ret != data_length) {
pr_err("%s() write returned %d\n", __func__, ret);
- return (ret < 0 ? ret : -EINVAL);
+ if (ret >= 0)
+ ret = -EINVAL;
}
} else {
/*
@@ -295,17 +294,29 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
pr_err("%s() returned %d, expecting %u for "
"S_ISBLK\n", __func__, ret,
data_length);
- return (ret < 0 ? ret : -EINVAL);
+ if (ret >= 0)
+ ret = -EINVAL;
}
} else {
if (ret < 0) {
pr_err("%s() returned %d for non S_ISBLK\n",
__func__, ret);
- return ret;
+ } else if (ret != data_length) {
+ /*
+ * Short read case:
+ * Probably some one truncate file under us.
+ * We must explicitly zero sg-pages to prevent
+ * expose uninizialized pages to userspace.
+ */
+ if (ret < data_length)
+ ret += iov_iter_zero(data_length - ret, &iter);
+ else
+ ret = -EINVAL;
}
}
}
- return 1;
+ kfree(bvec);
+ return ret;
}
static sense_reason_t
@@ -543,7 +554,8 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
sgl, sgl_nents, cmd->data_length, 0);
- if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
+ if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type &&
+ dev->dev_attrib.pi_prot_verify) {
u32 sectors = cmd->data_length >>
ilog2(dev->dev_attrib.block_size);
@@ -553,7 +565,8 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
return rc;
}
} else {
- if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
+ if (cmd->prot_type && dev->dev_attrib.pi_prot_type &&
+ dev->dev_attrib.pi_prot_verify) {
u32 sectors = cmd->data_length >>
ilog2(dev->dev_attrib.block_size);
@@ -595,8 +608,7 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- if (ret)
- target_complete_cmd(cmd, SAM_STAT_GOOD);
+ target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index d316ed537d59..bb069ebe4aa6 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -279,7 +279,7 @@ static void iblock_complete_cmd(struct se_cmd *cmd)
struct iblock_req *ibr = cmd->priv;
u8 status;
- if (!atomic_dec_and_test(&ibr->pending))
+ if (!refcount_dec_and_test(&ibr->pending))
return;
if (atomic_read(&ibr->ib_bio_err_cnt))
@@ -487,7 +487,7 @@ iblock_execute_write_same(struct se_cmd *cmd)
bio_list_init(&list);
bio_list_add(&list, bio);
- atomic_set(&ibr->pending, 1);
+ refcount_set(&ibr->pending, 1);
while (sectors) {
while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
@@ -498,7 +498,7 @@ iblock_execute_write_same(struct se_cmd *cmd)
if (!bio)
goto fail_put_bios;
- atomic_inc(&ibr->pending);
+ refcount_inc(&ibr->pending);
bio_list_add(&list, bio);
}
@@ -706,7 +706,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
cmd->priv = ibr;
if (!sgl_nents) {
- atomic_set(&ibr->pending, 1);
+ refcount_set(&ibr->pending, 1);
iblock_complete_cmd(cmd);
return 0;
}
@@ -719,7 +719,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
bio_list_init(&list);
bio_list_add(&list, bio);
- atomic_set(&ibr->pending, 2);
+ refcount_set(&ibr->pending, 2);
bio_cnt = 1;
for_each_sg(sgl, sg, sgl_nents, i) {
@@ -740,7 +740,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (!bio)
goto fail_put_bios;
- atomic_inc(&ibr->pending);
+ refcount_inc(&ibr->pending);
bio_list_add(&list, bio);
bio_cnt++;
}
diff --git a/drivers/target/target_core_iblock.h b/drivers/target/target_core_iblock.h
index 718d3fcd3e7c..f2a5797217d4 100644
--- a/drivers/target/target_core_iblock.h
+++ b/drivers/target/target_core_iblock.h
@@ -2,6 +2,7 @@
#define TARGET_CORE_IBLOCK_H
#include <linux/atomic.h>
+#include <linux/refcount.h>
#include <target/target_core_base.h>
#define IBLOCK_VERSION "4.0"
@@ -10,7 +11,7 @@
#define IBLOCK_LBA_SHIFT 9
struct iblock_req {
- atomic_t pending;
+ refcount_t pending;
atomic_t ib_bio_err_cnt;
} ____cacheline_aligned;
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index e18051185846..129ca572673c 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -4147,7 +4147,7 @@ target_check_reservation(struct se_cmd *cmd)
return 0;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
- if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
+ if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
spin_lock(&dev->dev_reservation_lock);
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index 847bd470339c..772f9148e75c 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -7,7 +7,7 @@
/*
* PERSISTENT_RESERVE_OUT service action codes
*
- * spc4r17 section 6.14.2 Table 171
+ * spc5r04b section 6.15.2 Table 174
*/
#define PRO_REGISTER 0x00
#define PRO_RESERVE 0x01
@@ -17,10 +17,11 @@
#define PRO_PREEMPT_AND_ABORT 0x05
#define PRO_REGISTER_AND_IGNORE_EXISTING_KEY 0x06
#define PRO_REGISTER_AND_MOVE 0x07
+#define PRO_REPLACE_LOST_RESERVATION 0x08
/*
* PERSISTENT_RESERVE_IN service action codes
*
- * spc4r17 section 6.13.1 Table 159
+ * spc5r04b section 6.14.1 Table 162
*/
#define PRI_READ_KEYS 0x00
#define PRI_READ_RESERVATION 0x01
@@ -29,13 +30,13 @@
/*
* PERSISTENT_RESERVE_ SCOPE field
*
- * spc4r17 section 6.13.3.3 Table 163
+ * spc5r04b section 6.14.3.2 Table 166
*/
#define PR_SCOPE_LU_SCOPE 0x00
/*
* PERSISTENT_RESERVE_* TYPE field
*
- * spc4r17 section 6.13.3.4 Table 164
+ * spc5r04b section 6.14.3.3 Table 167
*/
#define PR_TYPE_WRITE_EXCLUSIVE 0x01
#define PR_TYPE_EXCLUSIVE_ACCESS 0x03
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index a93d94e68ab5..3e4abb13f8ea 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1081,7 +1081,8 @@ 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_ALUA |
+ TRANSPORT_FLAG_PASSTHROUGH_PGR,
.attach_hba = pscsi_attach_hba,
.detach_hba = pscsi_detach_hba,
.pmode_enable_hba = pscsi_pmode_enable_hba,
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index ddc216c9f1f6..20253d04103f 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -47,11 +47,9 @@ static int rd_attach_hba(struct se_hba *hba, u32 host_id)
{
struct rd_host *rd_host;
- rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
- if (!rd_host) {
- pr_err("Unable to allocate memory for struct rd_host\n");
+ rd_host = kzalloc(sizeof(*rd_host), GFP_KERNEL);
+ if (!rd_host)
return -ENOMEM;
- }
rd_host->rd_host_id = host_id;
@@ -148,11 +146,8 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg),
GFP_KERNEL);
- if (!sg) {
- pr_err("Unable to allocate scatterlist array"
- " for struct rd_dev\n");
+ if (!sg)
return -ENOMEM;
- }
sg_init_table(sg, sg_per_table + chain_entry);
@@ -210,13 +205,9 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
total_sg_needed = rd_dev->rd_page_count;
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
-
- sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
- if (!sg_table) {
- pr_err("Unable to allocate memory for Ramdisk"
- " scatterlist tables\n");
+ sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
+ if (!sg_table)
return -ENOMEM;
- }
rd_dev->sg_table_array = sg_table;
rd_dev->sg_table_count = sg_tables;
@@ -271,13 +262,9 @@ static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block
total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
-
- sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
- if (!sg_table) {
- pr_err("Unable to allocate memory for Ramdisk protection"
- " scatterlist tables\n");
+ sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
+ if (!sg_table)
return -ENOMEM;
- }
rd_dev->sg_prot_array = sg_table;
rd_dev->sg_prot_count = sg_tables;
@@ -298,11 +285,9 @@ static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
struct rd_dev *rd_dev;
struct rd_host *rd_host = hba->hba_ptr;
- rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
- if (!rd_dev) {
- pr_err("Unable to allocate memory for struct rd_dev\n");
+ rd_dev = kzalloc(sizeof(*rd_dev), GFP_KERNEL);
+ if (!rd_dev)
return NULL;
- }
rd_dev->rd_host = rd_host;
@@ -410,7 +395,7 @@ static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
u32 prot_offset, prot_page;
u32 prot_npages __maybe_unused;
u64 tmp;
- sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ sense_reason_t rc = 0;
tmp = cmd->t_task_lba * se_dev->prot_length;
prot_offset = do_div(tmp, PAGE_SIZE);
@@ -423,13 +408,14 @@ static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
prot_sg = &prot_table->sg_table[prot_page -
prot_table->page_start_offset];
- if (is_read)
- rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
- prot_sg, prot_offset);
- else
- rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
- cmd->t_prot_sg, 0);
-
+ if (se_dev->dev_attrib.pi_prot_verify) {
+ if (is_read)
+ rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
+ prot_sg, prot_offset);
+ else
+ rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
+ cmd->t_prot_sg, 0);
+ }
if (!rc)
sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index c194063f169b..4316f7b65fb7 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -507,8 +507,11 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes
* been failed with a non-zero SCSI status.
*/
if (cmd->scsi_status) {
- pr_err("compare_and_write_callback: non zero scsi_status:"
+ pr_debug("compare_and_write_callback: non zero scsi_status:"
" 0x%02x\n", cmd->scsi_status);
+ *post_ret = 1;
+ if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out;
}
@@ -519,8 +522,8 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes
goto out;
}
- write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
- GFP_KERNEL);
+ write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg),
+ GFP_KERNEL);
if (!write_sg) {
pr_err("Unable to allocate compare_and_write sg\n");
ret = TCM_OUT_OF_RESOURCES;
@@ -924,6 +927,7 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
cmd->execute_cmd = sbc_execute_rw;
break;
case WRITE_16:
+ case WRITE_VERIFY_16:
sectors = transport_get_sectors_16(cdb);
cmd->t_task_lba = transport_lba_64(cdb);
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
index dfaef4d3b2d2..310d9e55c6eb 100644
--- a/drivers/target/target_core_tpg.c
+++ b/drivers/target/target_core_tpg.c
@@ -398,6 +398,13 @@ int core_tpg_set_initiator_node_queue_depth(
struct se_portal_group *tpg = acl->se_tpg;
/*
+ * Allow the setting of se_node_acl queue_depth to be idempotent,
+ * and not force a session shutdown event if the value is not
+ * changing.
+ */
+ if (acl->queue_depth == queue_depth)
+ return 0;
+ /*
* User has requested to change the queue depth for a Initiator Node.
* Change the value in the Node's struct se_node_acl, and call
* target_set_nacl_queue_depth() to set the new queue depth.
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index a0cd56ee5fe9..37f57357d4a0 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2311,7 +2311,7 @@ void *transport_kmap_data_sg(struct se_cmd *cmd)
return kmap(sg_page(sg)) + sg->offset;
/* >1 page. use vmap */
- pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
+ pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
if (!pages)
return NULL;
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index f615c3bbb73e..9045837f748b 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2,6 +2,7 @@
* Copyright (C) 2013 Shaohua Li <shli@kernel.org>
* Copyright (C) 2014 Red Hat, Inc.
* Copyright (C) 2015 Arrikto, Inc.
+ * Copyright (C) 2017 Chinamobile, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -25,10 +26,13 @@
#include <linux/parser.h>
#include <linux/vmalloc.h>
#include <linux/uio_driver.h>
+#include <linux/radix-tree.h>
#include <linux/stringify.h>
#include <linux/bitops.h>
#include <linux/highmem.h>
#include <linux/configfs.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
#include <net/genetlink.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_proto.h>
@@ -63,17 +67,26 @@
* this may have a 'UAM' comment.
*/
-
#define TCMU_TIME_OUT (30 * MSEC_PER_SEC)
-#define DATA_BLOCK_BITS 256
-#define DATA_BLOCK_SIZE 4096
+/* For cmd area, the size is fixed 8MB */
+#define CMDR_SIZE (8 * 1024 * 1024)
-#define CMDR_SIZE (16 * 4096)
+/*
+ * For data area, the block size is PAGE_SIZE and
+ * the total size is 256K * PAGE_SIZE.
+ */
+#define DATA_BLOCK_SIZE PAGE_SIZE
+#define DATA_BLOCK_BITS (256 * 1024)
#define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE)
+#define DATA_BLOCK_INIT_BITS 128
+/* The total size of the ring is 8M + 256K * PAGE_SIZE */
#define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE)
+/* Default maximum of the global data blocks(512K * PAGE_SIZE) */
+#define TCMU_GLOBAL_MAX_BLOCKS (512 * 1024)
+
static struct device *tcmu_root_device;
struct tcmu_hba {
@@ -83,6 +96,8 @@ struct tcmu_hba {
#define TCMU_CONFIG_LEN 256
struct tcmu_dev {
+ struct list_head node;
+
struct se_device se_dev;
char *name;
@@ -94,6 +109,8 @@ struct tcmu_dev {
struct uio_info uio_info;
+ struct inode *inode;
+
struct tcmu_mailbox *mb_addr;
size_t dev_size;
u32 cmdr_size;
@@ -103,11 +120,14 @@ struct tcmu_dev {
size_t data_off;
size_t data_size;
- DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS);
-
wait_queue_head_t wait_cmdr;
- /* TODO should this be a mutex? */
- spinlock_t cmdr_lock;
+ struct mutex cmdr_lock;
+
+ bool waiting_global;
+ uint32_t dbi_max;
+ uint32_t dbi_thresh;
+ DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS);
+ struct radix_tree_root data_blocks;
struct idr commands;
spinlock_t commands_lock;
@@ -130,7 +150,9 @@ struct tcmu_cmd {
/* Can't use se_cmd when cleaning up expired cmds, because if
cmd has been completed then accessing se_cmd is off limits */
- DECLARE_BITMAP(data_bitmap, DATA_BLOCK_BITS);
+ uint32_t dbi_cnt;
+ uint32_t dbi_cur;
+ uint32_t *dbi;
unsigned long deadline;
@@ -138,6 +160,13 @@ struct tcmu_cmd {
unsigned long flags;
};
+static struct task_struct *unmap_thread;
+static wait_queue_head_t unmap_wait;
+static DEFINE_MUTEX(root_udev_mutex);
+static LIST_HEAD(root_udev);
+
+static atomic_t global_db_count = ATOMIC_INIT(0);
+
static struct kmem_cache *tcmu_cmd_cache;
/* multicast group */
@@ -161,6 +190,114 @@ static struct genl_family tcmu_genl_family __ro_after_init = {
.netnsok = true,
};
+#define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index))
+#define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0)
+#define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index))
+#define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++])
+
+static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len)
+{
+ struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
+ uint32_t i;
+
+ for (i = 0; i < len; i++)
+ clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap);
+}
+
+static inline bool tcmu_get_empty_block(struct tcmu_dev *udev,
+ struct tcmu_cmd *tcmu_cmd)
+{
+ struct page *page;
+ int ret, dbi;
+
+ dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh);
+ if (dbi == udev->dbi_thresh)
+ return false;
+
+ page = radix_tree_lookup(&udev->data_blocks, dbi);
+ if (!page) {
+
+ if (atomic_add_return(1, &global_db_count) >
+ TCMU_GLOBAL_MAX_BLOCKS) {
+ atomic_dec(&global_db_count);
+ return false;
+ }
+
+ /* try to get new page from the mm */
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ return false;
+
+ ret = radix_tree_insert(&udev->data_blocks, dbi, page);
+ if (ret) {
+ __free_page(page);
+ return false;
+ }
+
+ }
+
+ if (dbi > udev->dbi_max)
+ udev->dbi_max = dbi;
+
+ set_bit(dbi, udev->data_bitmap);
+ tcmu_cmd_set_dbi(tcmu_cmd, dbi);
+
+ return true;
+}
+
+static bool tcmu_get_empty_blocks(struct tcmu_dev *udev,
+ struct tcmu_cmd *tcmu_cmd)
+{
+ int i;
+
+ udev->waiting_global = false;
+
+ for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) {
+ if (!tcmu_get_empty_block(udev, tcmu_cmd))
+ goto err;
+ }
+ return true;
+
+err:
+ udev->waiting_global = true;
+ /* Try to wake up the unmap thread */
+ wake_up(&unmap_wait);
+ return false;
+}
+
+static inline struct page *
+tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi)
+{
+ return radix_tree_lookup(&udev->data_blocks, dbi);
+}
+
+static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd)
+{
+ kfree(tcmu_cmd->dbi);
+ kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
+}
+
+static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd)
+{
+ struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
+ size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE);
+
+ if (se_cmd->se_cmd_flags & SCF_BIDI) {
+ BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents));
+ data_length += round_up(se_cmd->t_bidi_data_sg->length,
+ DATA_BLOCK_SIZE);
+ }
+
+ return data_length;
+}
+
+static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd)
+{
+ size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
+
+ return data_length / DATA_BLOCK_SIZE;
+}
+
static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
{
struct se_device *se_dev = se_cmd->se_dev;
@@ -178,6 +315,15 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
tcmu_cmd->deadline = jiffies +
msecs_to_jiffies(udev->cmd_time_out);
+ tcmu_cmd_reset_dbi_cur(tcmu_cmd);
+ tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd);
+ tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t),
+ GFP_KERNEL);
+ if (!tcmu_cmd->dbi) {
+ kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
+ return NULL;
+ }
+
idr_preload(GFP_KERNEL);
spin_lock_irq(&udev->commands_lock);
cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0,
@@ -186,7 +332,7 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
idr_preload_end();
if (cmd_id < 0) {
- kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
+ tcmu_free_cmd(tcmu_cmd);
return NULL;
}
tcmu_cmd->cmd_id = cmd_id;
@@ -248,10 +394,10 @@ static inline void new_iov(struct iovec **iov, int *iov_cnt,
#define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size)
/* offset is relative to mb_addr */
-static inline size_t get_block_offset(struct tcmu_dev *dev,
- int block, int remaining)
+static inline size_t get_block_offset_user(struct tcmu_dev *dev,
+ int dbi, int remaining)
{
- return dev->data_off + block * DATA_BLOCK_SIZE +
+ return dev->data_off + dbi * DATA_BLOCK_SIZE +
DATA_BLOCK_SIZE - remaining;
}
@@ -260,37 +406,45 @@ static inline size_t iov_tail(struct tcmu_dev *udev, struct iovec *iov)
return (size_t)iov->iov_base + iov->iov_len;
}
-static void alloc_and_scatter_data_area(struct tcmu_dev *udev,
- struct scatterlist *data_sg, unsigned int data_nents,
- struct iovec **iov, int *iov_cnt, bool copy_data)
+static int scatter_data_area(struct tcmu_dev *udev,
+ struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg,
+ unsigned int data_nents, struct iovec **iov,
+ int *iov_cnt, bool copy_data)
{
- int i, block;
+ int i, dbi;
int block_remaining = 0;
- void *from, *to;
- size_t copy_bytes, to_offset;
+ void *from, *to = NULL;
+ size_t copy_bytes, to_offset, offset;
struct scatterlist *sg;
+ struct page *page;
for_each_sg(data_sg, sg, data_nents, i) {
int sg_remaining = sg->length;
from = kmap_atomic(sg_page(sg)) + sg->offset;
while (sg_remaining > 0) {
if (block_remaining == 0) {
- block = find_first_zero_bit(udev->data_bitmap,
- DATA_BLOCK_BITS);
+ if (to)
+ kunmap_atomic(to);
+
block_remaining = DATA_BLOCK_SIZE;
- set_bit(block, udev->data_bitmap);
+ dbi = tcmu_cmd_get_dbi(tcmu_cmd);
+ page = tcmu_get_block_page(udev, dbi);
+ to = kmap_atomic(page);
}
+
copy_bytes = min_t(size_t, sg_remaining,
block_remaining);
- to_offset = get_block_offset(udev, block,
+ to_offset = get_block_offset_user(udev, dbi,
block_remaining);
- to = (void *)udev->mb_addr + to_offset;
+ offset = DATA_BLOCK_SIZE - block_remaining;
+ to = (void *)(unsigned long)to + offset;
+
if (*iov_cnt != 0 &&
to_offset == iov_tail(udev, *iov)) {
(*iov)->iov_len += copy_bytes;
} else {
new_iov(iov, iov_cnt, udev);
- (*iov)->iov_base = (void __user *) to_offset;
+ (*iov)->iov_base = (void __user *)to_offset;
(*iov)->iov_len = copy_bytes;
}
if (copy_data) {
@@ -303,33 +457,29 @@ static void alloc_and_scatter_data_area(struct tcmu_dev *udev,
}
kunmap_atomic(from - sg->offset);
}
-}
+ if (to)
+ kunmap_atomic(to);
-static void free_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd)
-{
- bitmap_xor(udev->data_bitmap, udev->data_bitmap, cmd->data_bitmap,
- DATA_BLOCK_BITS);
+ return 0;
}
static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
bool bidi)
{
struct se_cmd *se_cmd = cmd->se_cmd;
- int i, block;
+ int i, dbi;
int block_remaining = 0;
- void *from, *to;
- size_t copy_bytes, from_offset;
+ void *from = NULL, *to;
+ size_t copy_bytes, offset;
struct scatterlist *sg, *data_sg;
+ struct page *page;
unsigned int data_nents;
- DECLARE_BITMAP(bitmap, DATA_BLOCK_BITS);
-
- bitmap_copy(bitmap, cmd->data_bitmap, DATA_BLOCK_BITS);
+ uint32_t count = 0;
if (!bidi) {
data_sg = se_cmd->t_data_sg;
data_nents = se_cmd->t_data_nents;
} else {
- uint32_t count;
/*
* For bidi case, the first count blocks are for Data-Out
@@ -337,30 +487,30 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
* the Data-Out buffer blocks should be discarded.
*/
count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE);
- while (count--) {
- block = find_first_bit(bitmap, DATA_BLOCK_BITS);
- clear_bit(block, bitmap);
- }
data_sg = se_cmd->t_bidi_data_sg;
data_nents = se_cmd->t_bidi_data_nents;
}
+ tcmu_cmd_set_dbi_cur(cmd, count);
+
for_each_sg(data_sg, sg, data_nents, i) {
int sg_remaining = sg->length;
to = kmap_atomic(sg_page(sg)) + sg->offset;
while (sg_remaining > 0) {
if (block_remaining == 0) {
- block = find_first_bit(bitmap,
- DATA_BLOCK_BITS);
+ if (from)
+ kunmap_atomic(from);
+
block_remaining = DATA_BLOCK_SIZE;
- clear_bit(block, bitmap);
+ dbi = tcmu_cmd_get_dbi(cmd);
+ page = tcmu_get_block_page(udev, dbi);
+ from = kmap_atomic(page);
}
copy_bytes = min_t(size_t, sg_remaining,
block_remaining);
- from_offset = get_block_offset(udev, block,
- block_remaining);
- from = (void *) udev->mb_addr + from_offset;
+ offset = DATA_BLOCK_SIZE - block_remaining;
+ from = (void *)(unsigned long)from + offset;
tcmu_flush_dcache_range(from, copy_bytes);
memcpy(to + sg->length - sg_remaining, from,
copy_bytes);
@@ -370,12 +520,13 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
}
kunmap_atomic(to - sg->offset);
}
+ if (from)
+ kunmap_atomic(from);
}
-static inline size_t spc_bitmap_free(unsigned long *bitmap)
+static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh)
{
- return DATA_BLOCK_SIZE * (DATA_BLOCK_BITS -
- bitmap_weight(bitmap, DATA_BLOCK_BITS));
+ return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh));
}
/*
@@ -384,9 +535,12 @@ static inline size_t spc_bitmap_free(unsigned long *bitmap)
*
* Called with ring lock held.
*/
-static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t data_needed)
+static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
+ size_t cmd_size, size_t data_needed)
{
struct tcmu_mailbox *mb = udev->mb_addr;
+ uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1)
+ / DATA_BLOCK_SIZE;
size_t space, cmd_needed;
u32 cmd_head;
@@ -410,35 +564,63 @@ static bool is_ring_space_avail(struct tcmu_dev *udev, size_t cmd_size, size_t d
return false;
}
- space = spc_bitmap_free(udev->data_bitmap);
+ /* try to check and get the data blocks as needed */
+ space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh);
if (space < data_needed) {
- pr_debug("no data space: only %zu available, but ask for %zu\n",
- space, data_needed);
- return false;
+ unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh;
+ unsigned long grow;
+
+ if (blocks_left < blocks_needed) {
+ pr_debug("no data space: only %lu available, but ask for %zu\n",
+ blocks_left * DATA_BLOCK_SIZE,
+ data_needed);
+ return false;
+ }
+
+ /* Try to expand the thresh */
+ if (!udev->dbi_thresh) {
+ /* From idle state */
+ uint32_t init_thresh = DATA_BLOCK_INIT_BITS;
+
+ udev->dbi_thresh = max(blocks_needed, init_thresh);
+ } else {
+ /*
+ * Grow the data area by max(blocks needed,
+ * dbi_thresh / 2), but limited to the max
+ * DATA_BLOCK_BITS size.
+ */
+ grow = max(blocks_needed, udev->dbi_thresh / 2);
+ udev->dbi_thresh += grow;
+ if (udev->dbi_thresh > DATA_BLOCK_BITS)
+ udev->dbi_thresh = DATA_BLOCK_BITS;
+ }
}
+ if (!tcmu_get_empty_blocks(udev, cmd))
+ return false;
+
return true;
}
-static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd)
+static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt)
{
- struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
- size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE);
-
- if (se_cmd->se_cmd_flags & SCF_BIDI) {
- BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents));
- data_length += round_up(se_cmd->t_bidi_data_sg->length,
- DATA_BLOCK_SIZE);
- }
-
- return data_length;
+ return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]),
+ sizeof(struct tcmu_cmd_entry));
}
-static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd)
+static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd,
+ size_t base_command_size)
{
- size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
+ struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
+ size_t command_size;
- return data_length / DATA_BLOCK_SIZE;
+ command_size = base_command_size +
+ round_up(scsi_command_size(se_cmd->t_task_cdb),
+ TCMU_OP_ALIGN_SIZE);
+
+ WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1));
+
+ return command_size;
}
static sense_reason_t
@@ -450,12 +632,11 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
struct tcmu_mailbox *mb;
struct tcmu_cmd_entry *entry;
struct iovec *iov;
- int iov_cnt;
+ int iov_cnt, ret;
uint32_t cmd_head;
uint64_t cdb_off;
bool copy_to_data_area;
size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
- DECLARE_BITMAP(old_bitmap, DATA_BLOCK_BITS);
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags))
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
@@ -464,18 +645,18 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
* Must be a certain minimum size for response sense info, but
* also may be larger if the iov array is large.
*
- * We prepare way too many iovs for potential uses here, because it's
- * expensive to tell how many regions are freed in the bitmap
- */
- base_command_size = max(offsetof(struct tcmu_cmd_entry,
- req.iov[tcmu_cmd_get_block_cnt(tcmu_cmd)]),
- sizeof(struct tcmu_cmd_entry));
- command_size = base_command_size
- + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE);
-
- WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1));
+ * We prepare as many iovs as possbile for potential uses here,
+ * because it's expensive to tell how many regions are freed in
+ * the bitmap & global data pool, as the size calculated here
+ * will only be used to do the checks.
+ *
+ * The size will be recalculated later as actually needed to save
+ * cmd area memories.
+ */
+ base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt);
+ command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
- spin_lock_irq(&udev->cmdr_lock);
+ mutex_lock(&udev->cmdr_lock);
mb = udev->mb_addr;
cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
@@ -484,18 +665,18 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu "
"cmd ring/data area\n", command_size, data_length,
udev->cmdr_size, udev->data_size);
- spin_unlock_irq(&udev->cmdr_lock);
+ mutex_unlock(&udev->cmdr_lock);
return TCM_INVALID_CDB_FIELD;
}
- while (!is_ring_space_avail(udev, command_size, data_length)) {
+ while (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) {
int ret;
DEFINE_WAIT(__wait);
prepare_to_wait(&udev->wait_cmdr, &__wait, TASK_INTERRUPTIBLE);
pr_debug("sleeping for ring space\n");
- spin_unlock_irq(&udev->cmdr_lock);
+ mutex_unlock(&udev->cmdr_lock);
if (udev->cmd_time_out)
ret = schedule_timeout(
msecs_to_jiffies(udev->cmd_time_out));
@@ -507,7 +688,7 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
- spin_lock_irq(&udev->cmdr_lock);
+ mutex_lock(&udev->cmdr_lock);
/* We dropped cmdr_lock, cmd_head is stale */
cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
@@ -534,20 +715,26 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
entry = (void *) mb + CMDR_OFF + cmd_head;
tcmu_flush_dcache_range(entry, sizeof(*entry));
tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD);
- tcmu_hdr_set_len(&entry->hdr.len_op, command_size);
entry->hdr.cmd_id = tcmu_cmd->cmd_id;
entry->hdr.kflags = 0;
entry->hdr.uflags = 0;
- bitmap_copy(old_bitmap, udev->data_bitmap, DATA_BLOCK_BITS);
-
/* Handle allocating space from the data area */
+ tcmu_cmd_reset_dbi_cur(tcmu_cmd);
iov = &entry->req.iov[0];
iov_cnt = 0;
copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE
|| se_cmd->se_cmd_flags & SCF_BIDI);
- alloc_and_scatter_data_area(udev, se_cmd->t_data_sg,
- se_cmd->t_data_nents, &iov, &iov_cnt, copy_to_data_area);
+ ret = scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg,
+ se_cmd->t_data_nents, &iov, &iov_cnt,
+ copy_to_data_area);
+ if (ret) {
+ tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
+ mutex_unlock(&udev->cmdr_lock);
+
+ pr_err("tcmu: alloc and scatter data failed\n");
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
entry->req.iov_cnt = iov_cnt;
entry->req.iov_dif_cnt = 0;
@@ -555,14 +742,29 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
if (se_cmd->se_cmd_flags & SCF_BIDI) {
iov_cnt = 0;
iov++;
- alloc_and_scatter_data_area(udev, se_cmd->t_bidi_data_sg,
- se_cmd->t_bidi_data_nents, &iov, &iov_cnt,
- false);
+ ret = scatter_data_area(udev, tcmu_cmd,
+ se_cmd->t_bidi_data_sg,
+ se_cmd->t_bidi_data_nents,
+ &iov, &iov_cnt, false);
+ if (ret) {
+ tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
+ mutex_unlock(&udev->cmdr_lock);
+
+ pr_err("tcmu: alloc and scatter bidi data failed\n");
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
entry->req.iov_bidi_cnt = iov_cnt;
}
- /* cmd's data_bitmap is what changed in process */
- bitmap_xor(tcmu_cmd->data_bitmap, old_bitmap, udev->data_bitmap,
- DATA_BLOCK_BITS);
+
+ /*
+ * Recalaulate the command's base size and size according
+ * to the actual needs
+ */
+ base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt +
+ entry->req.iov_bidi_cnt);
+ command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
+
+ tcmu_hdr_set_len(&entry->hdr.len_op, command_size);
/* All offsets relative to mb_addr, not start of entry! */
cdb_off = CMDR_OFF + cmd_head + base_command_size;
@@ -572,8 +774,7 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size);
tcmu_flush_dcache_range(mb, sizeof(*mb));
-
- spin_unlock_irq(&udev->cmdr_lock);
+ mutex_unlock(&udev->cmdr_lock);
/* TODO: only if FLUSH and FUA? */
uio_event_notify(&udev->uio_info);
@@ -604,7 +805,7 @@ tcmu_queue_cmd(struct se_cmd *se_cmd)
idr_remove(&udev->commands, tcmu_cmd->cmd_id);
spin_unlock_irq(&udev->commands_lock);
- kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
+ tcmu_free_cmd(tcmu_cmd);
}
return ret;
@@ -615,50 +816,45 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
struct se_cmd *se_cmd = cmd->se_cmd;
struct tcmu_dev *udev = cmd->tcmu_dev;
- if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
- /*
- * cmd has been completed already from timeout, just reclaim
- * data area space and free cmd
- */
- free_data_area(udev, cmd);
+ /*
+ * cmd has been completed already from timeout, just reclaim
+ * data area space and free cmd
+ */
+ if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags))
+ goto out;
- kmem_cache_free(tcmu_cmd_cache, cmd);
- return;
- }
+ tcmu_cmd_reset_dbi_cur(cmd);
if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) {
- free_data_area(udev, cmd);
pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n",
cmd->se_cmd);
entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION;
} else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) {
memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer,
se_cmd->scsi_sense_length);
- free_data_area(udev, cmd);
} else if (se_cmd->se_cmd_flags & SCF_BIDI) {
/* Get Data-In buffer before clean up */
gather_data_area(udev, cmd, true);
- free_data_area(udev, cmd);
} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
gather_data_area(udev, cmd, false);
- free_data_area(udev, cmd);
} else if (se_cmd->data_direction == DMA_TO_DEVICE) {
- free_data_area(udev, cmd);
+ /* TODO: */
} else if (se_cmd->data_direction != DMA_NONE) {
pr_warn("TCMU: data direction was %d!\n",
se_cmd->data_direction);
}
target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status);
- cmd->se_cmd = NULL;
- kmem_cache_free(tcmu_cmd_cache, cmd);
+out:
+ cmd->se_cmd = NULL;
+ tcmu_cmd_free_data(cmd, cmd->dbi_cnt);
+ tcmu_free_cmd(cmd);
}
static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
{
struct tcmu_mailbox *mb;
- unsigned long flags;
int handled = 0;
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) {
@@ -666,8 +862,6 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
return 0;
}
- spin_lock_irqsave(&udev->cmdr_lock, flags);
-
mb = udev->mb_addr;
tcmu_flush_dcache_range(mb, sizeof(*mb));
@@ -708,8 +902,6 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
if (mb->cmd_tail == mb->cmd_head)
del_timer(&udev->timeout); /* no more pending cmds */
- spin_unlock_irqrestore(&udev->cmdr_lock, flags);
-
wake_up(&udev->wait_cmdr);
return handled;
@@ -736,16 +928,14 @@ static void tcmu_device_timedout(unsigned long data)
{
struct tcmu_dev *udev = (struct tcmu_dev *)data;
unsigned long flags;
- int handled;
-
- handled = tcmu_handle_completions(udev);
-
- pr_warn("%d completions handled from timeout\n", handled);
spin_lock_irqsave(&udev->commands_lock, flags);
idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL);
spin_unlock_irqrestore(&udev->commands_lock, flags);
+ /* Try to wake up the ummap thread */
+ wake_up(&unmap_wait);
+
/*
* We don't need to wakeup threads on wait_cmdr since they have their
* own timeout.
@@ -790,7 +980,7 @@ static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name)
udev->cmd_time_out = TCMU_TIME_OUT;
init_waitqueue_head(&udev->wait_cmdr);
- spin_lock_init(&udev->cmdr_lock);
+ mutex_init(&udev->cmdr_lock);
idr_init(&udev->commands);
spin_lock_init(&udev->commands_lock);
@@ -805,7 +995,9 @@ static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on)
{
struct tcmu_dev *tcmu_dev = container_of(info, struct tcmu_dev, uio_info);
+ mutex_lock(&tcmu_dev->cmdr_lock);
tcmu_handle_completions(tcmu_dev);
+ mutex_unlock(&tcmu_dev->cmdr_lock);
return 0;
}
@@ -827,6 +1019,60 @@ static int tcmu_find_mem_index(struct vm_area_struct *vma)
return -1;
}
+static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi)
+{
+ struct page *page;
+ int ret;
+
+ mutex_lock(&udev->cmdr_lock);
+ page = tcmu_get_block_page(udev, dbi);
+ if (likely(page)) {
+ mutex_unlock(&udev->cmdr_lock);
+ return page;
+ }
+
+ /*
+ * Normally it shouldn't be here:
+ * Only when the userspace has touched the blocks which
+ * are out of the tcmu_cmd's data iov[], and will return
+ * one zeroed page.
+ */
+ pr_warn("Block(%u) out of cmd's iov[] has been touched!\n", dbi);
+ pr_warn("Mostly it will be a bug of userspace, please have a check!\n");
+
+ if (dbi >= udev->dbi_thresh) {
+ /* Extern the udev->dbi_thresh to dbi + 1 */
+ udev->dbi_thresh = dbi + 1;
+ udev->dbi_max = dbi;
+ }
+
+ page = radix_tree_lookup(&udev->data_blocks, dbi);
+ if (!page) {
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page) {
+ mutex_unlock(&udev->cmdr_lock);
+ return NULL;
+ }
+
+ ret = radix_tree_insert(&udev->data_blocks, dbi, page);
+ if (ret) {
+ mutex_unlock(&udev->cmdr_lock);
+ __free_page(page);
+ return NULL;
+ }
+
+ /*
+ * Since this case is rare in page fault routine, here we
+ * will allow the global_db_count >= TCMU_GLOBAL_MAX_BLOCKS
+ * to reduce possible page fault call trace.
+ */
+ atomic_inc(&global_db_count);
+ }
+ mutex_unlock(&udev->cmdr_lock);
+
+ return page;
+}
+
static int tcmu_vma_fault(struct vm_fault *vmf)
{
struct tcmu_dev *udev = vmf->vma->vm_private_data;
@@ -845,11 +1091,20 @@ static int tcmu_vma_fault(struct vm_fault *vmf)
*/
offset = (vmf->pgoff - mi) << PAGE_SHIFT;
- addr = (void *)(unsigned long)info->mem[mi].addr + offset;
- if (info->mem[mi].memtype == UIO_MEM_LOGICAL)
- page = virt_to_page(addr);
- else
+ if (offset < udev->data_off) {
+ /* For the vmalloc()ed cmd area pages */
+ addr = (void *)(unsigned long)info->mem[mi].addr + offset;
page = vmalloc_to_page(addr);
+ } else {
+ uint32_t dbi;
+
+ /* For the dynamically growing data area pages */
+ dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE;
+ page = tcmu_try_get_block_page(udev, dbi);
+ if (!page)
+ return VM_FAULT_NOPAGE;
+ }
+
get_page(page);
vmf->page = page;
return 0;
@@ -883,6 +1138,8 @@ static int tcmu_open(struct uio_info *info, struct inode *inode)
if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags))
return -EBUSY;
+ udev->inode = inode;
+
pr_debug("open\n");
return 0;
@@ -963,7 +1220,7 @@ static int tcmu_configure_device(struct se_device *dev)
info->name = str;
- udev->mb_addr = vzalloc(TCMU_RING_SIZE);
+ udev->mb_addr = vzalloc(CMDR_SIZE);
if (!udev->mb_addr) {
ret = -ENOMEM;
goto err_vzalloc;
@@ -972,8 +1229,11 @@ static int tcmu_configure_device(struct se_device *dev)
/* mailbox fits in first part of CMDR space */
udev->cmdr_size = CMDR_SIZE - CMDR_OFF;
udev->data_off = CMDR_SIZE;
- udev->data_size = TCMU_RING_SIZE - CMDR_SIZE;
+ udev->data_size = DATA_SIZE;
+ udev->dbi_thresh = 0; /* Default in Idle state */
+ udev->waiting_global = false;
+ /* Initialise the mailbox of the ring buffer */
mb = udev->mb_addr;
mb->version = TCMU_MAILBOX_VERSION;
mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC;
@@ -984,12 +1244,14 @@ static int tcmu_configure_device(struct se_device *dev)
WARN_ON(udev->data_size % PAGE_SIZE);
WARN_ON(udev->data_size % DATA_BLOCK_SIZE);
+ INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL);
+
info->version = __stringify(TCMU_MAILBOX_VERSION);
info->mem[0].name = "tcm-user command & data buffer";
info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr;
info->mem[0].size = TCMU_RING_SIZE;
- info->mem[0].memtype = UIO_MEM_VIRTUAL;
+ info->mem[0].memtype = UIO_MEM_NONE;
info->irqcontrol = tcmu_irqcontrol;
info->irq = UIO_IRQ_CUSTOM;
@@ -1015,6 +1277,10 @@ static int tcmu_configure_device(struct se_device *dev)
if (ret)
goto err_netlink;
+ mutex_lock(&root_udev_mutex);
+ list_add(&udev->node, &root_udev);
+ mutex_unlock(&root_udev_mutex);
+
return 0;
err_netlink:
@@ -1049,6 +1315,23 @@ static bool tcmu_dev_configured(struct tcmu_dev *udev)
return udev->uio_info.uio_dev ? true : false;
}
+static void tcmu_blocks_release(struct tcmu_dev *udev)
+{
+ int i;
+ struct page *page;
+
+ /* Try to release all block pages */
+ mutex_lock(&udev->cmdr_lock);
+ for (i = 0; i <= udev->dbi_max; i++) {
+ page = radix_tree_delete(&udev->data_blocks, i);
+ if (page) {
+ __free_page(page);
+ atomic_dec(&global_db_count);
+ }
+ }
+ mutex_unlock(&udev->cmdr_lock);
+}
+
static void tcmu_free_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
@@ -1058,6 +1341,10 @@ static void tcmu_free_device(struct se_device *dev)
del_timer_sync(&udev->timeout);
+ mutex_lock(&root_udev_mutex);
+ list_del(&udev->node);
+ mutex_unlock(&root_udev_mutex);
+
vfree(udev->mb_addr);
/* Upper layer should drain all requests before calling this */
@@ -1070,6 +1357,8 @@ static void tcmu_free_device(struct se_device *dev)
spin_unlock_irq(&udev->commands_lock);
WARN_ON(!all_expired);
+ tcmu_blocks_release(udev);
+
if (tcmu_dev_configured(udev)) {
tcmu_netlink_event(TCMU_CMD_REMOVED_DEVICE, udev->uio_info.name,
udev->uio_info.uio_dev->minor);
@@ -1256,6 +1545,84 @@ static struct target_backend_ops tcmu_ops = {
.tb_dev_attrib_attrs = NULL,
};
+static int unmap_thread_fn(void *data)
+{
+ struct tcmu_dev *udev;
+ loff_t off;
+ uint32_t start, end, block;
+ struct page *page;
+ int i;
+
+ while (1) {
+ DEFINE_WAIT(__wait);
+
+ prepare_to_wait(&unmap_wait, &__wait, TASK_INTERRUPTIBLE);
+ schedule();
+ finish_wait(&unmap_wait, &__wait);
+
+ if (kthread_should_stop())
+ break;
+
+ mutex_lock(&root_udev_mutex);
+ list_for_each_entry(udev, &root_udev, node) {
+ mutex_lock(&udev->cmdr_lock);
+
+ /* Try to complete the finished commands first */
+ tcmu_handle_completions(udev);
+
+ /* Skip the udevs waiting the global pool or in idle */
+ if (udev->waiting_global || !udev->dbi_thresh) {
+ mutex_unlock(&udev->cmdr_lock);
+ continue;
+ }
+
+ end = udev->dbi_max + 1;
+ block = find_last_bit(udev->data_bitmap, end);
+ if (block == udev->dbi_max) {
+ /*
+ * The last bit is dbi_max, so there is
+ * no need to shrink any blocks.
+ */
+ mutex_unlock(&udev->cmdr_lock);
+ continue;
+ } else if (block == end) {
+ /* The current udev will goto idle state */
+ udev->dbi_thresh = start = 0;
+ udev->dbi_max = 0;
+ } else {
+ udev->dbi_thresh = start = block + 1;
+ udev->dbi_max = block;
+ }
+
+ /* Here will truncate the data area from off */
+ off = udev->data_off + start * DATA_BLOCK_SIZE;
+ unmap_mapping_range(udev->inode->i_mapping, off, 0, 1);
+
+ /* Release the block pages */
+ for (i = start; i < end; i++) {
+ page = radix_tree_delete(&udev->data_blocks, i);
+ if (page) {
+ __free_page(page);
+ atomic_dec(&global_db_count);
+ }
+ }
+ mutex_unlock(&udev->cmdr_lock);
+ }
+
+ /*
+ * Try to wake up the udevs who are waiting
+ * for the global data pool.
+ */
+ list_for_each_entry(udev, &root_udev, node) {
+ if (udev->waiting_global)
+ wake_up(&udev->wait_cmdr);
+ }
+ mutex_unlock(&root_udev_mutex);
+ }
+
+ return 0;
+}
+
static int __init tcmu_module_init(void)
{
int ret, i, len = 0;
@@ -1301,8 +1668,17 @@ static int __init tcmu_module_init(void)
if (ret)
goto out_attrs;
+ init_waitqueue_head(&unmap_wait);
+ unmap_thread = kthread_run(unmap_thread_fn, NULL, "tcmu_unmap");
+ if (IS_ERR(unmap_thread)) {
+ ret = PTR_ERR(unmap_thread);
+ goto out_unreg_transport;
+ }
+
return 0;
+out_unreg_transport:
+ target_backend_unregister(&tcmu_ops);
out_attrs:
kfree(tcmu_attrs);
out_unreg_genl:
@@ -1317,6 +1693,7 @@ out_free_cache:
static void __exit tcmu_module_exit(void)
{
+ kthread_stop(unmap_thread);
target_backend_unregister(&tcmu_ops);
kfree(tcmu_attrs);
genl_unregister_family(&tcmu_genl_family);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 14:28:46 +0000