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path: root/drivers/target/target_core_device.c
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Diffstat (limited to 'drivers/target/target_core_device.c')
-rw-r--r--drivers/target/target_core_device.c145
1 files changed, 118 insertions, 27 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 8add07f387f9..e8dd6da164b2 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -49,8 +49,9 @@
#include "target_core_pr.h"
#include "target_core_ua.h"
-DEFINE_MUTEX(g_device_mutex);
-LIST_HEAD(g_device_list);
+static DEFINE_MUTEX(device_mutex);
+static LIST_HEAD(device_list);
+static DEFINE_IDR(devices_idr);
static struct se_hba *lun0_hba;
/* not static, needed by tpg.c */
@@ -168,11 +169,20 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
rcu_read_lock();
deve = target_nacl_find_deve(nacl, unpacked_lun);
if (deve) {
- se_cmd->se_lun = rcu_dereference(deve->se_lun);
se_lun = rcu_dereference(deve->se_lun);
+
+ if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
+ se_lun = NULL;
+ goto out_unlock;
+ }
+
+ se_cmd->se_lun = rcu_dereference(deve->se_lun);
se_cmd->pr_res_key = deve->pr_res_key;
se_cmd->orig_fe_lun = unpacked_lun;
+ se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+ se_cmd->lun_ref_active = true;
}
+out_unlock:
rcu_read_unlock();
if (!se_lun) {
@@ -182,9 +192,6 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
unpacked_lun);
return -ENODEV;
}
- /*
- * XXX: Add percpu se_lun->lun_ref reference count for TMR
- */
se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
@@ -756,19 +763,16 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
if (!dev)
return NULL;
- dev->dev_link_magic = SE_DEV_LINK_MAGIC;
dev->se_hba = hba;
dev->transport = hba->backend->ops;
dev->prot_length = sizeof(struct t10_pi_tuple);
dev->hba_index = hba->hba_index;
- INIT_LIST_HEAD(&dev->dev_list);
INIT_LIST_HEAD(&dev->dev_sep_list);
INIT_LIST_HEAD(&dev->dev_tmr_list);
INIT_LIST_HEAD(&dev->delayed_cmd_list);
INIT_LIST_HEAD(&dev->state_list);
INIT_LIST_HEAD(&dev->qf_cmd_list);
- INIT_LIST_HEAD(&dev->g_dev_node);
spin_lock_init(&dev->execute_task_lock);
spin_lock_init(&dev->delayed_cmd_lock);
spin_lock_init(&dev->dev_reservation_lock);
@@ -851,7 +855,7 @@ bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
attrib->unmap_granularity = q->limits.discard_granularity / block_size;
attrib->unmap_granularity_alignment = q->limits.discard_alignment /
block_size;
- attrib->unmap_zeroes_data = 0;
+ attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
return true;
}
EXPORT_SYMBOL(target_configure_unmap_from_queue);
@@ -875,10 +879,79 @@ sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
}
EXPORT_SYMBOL(target_to_linux_sector);
+/**
+ * target_find_device - find a se_device by its dev_index
+ * @id: dev_index
+ * @do_depend: true if caller needs target_depend_item to be done
+ *
+ * If do_depend is true, the caller must do a target_undepend_item
+ * when finished using the device.
+ *
+ * If do_depend is false, the caller must be called in a configfs
+ * callback or during removal.
+ */
+struct se_device *target_find_device(int id, bool do_depend)
+{
+ struct se_device *dev;
+
+ mutex_lock(&device_mutex);
+ dev = idr_find(&devices_idr, id);
+ if (dev && do_depend && target_depend_item(&dev->dev_group.cg_item))
+ dev = NULL;
+ mutex_unlock(&device_mutex);
+ return dev;
+}
+EXPORT_SYMBOL(target_find_device);
+
+struct devices_idr_iter {
+ int (*fn)(struct se_device *dev, void *data);
+ void *data;
+};
+
+static int target_devices_idr_iter(int id, void *p, void *data)
+{
+ struct devices_idr_iter *iter = data;
+ struct se_device *dev = p;
+
+ /*
+ * We add the device early to the idr, so it can be used
+ * by backend modules during configuration. We do not want
+ * to allow other callers to access partially setup devices,
+ * so we skip them here.
+ */
+ if (!(dev->dev_flags & DF_CONFIGURED))
+ return 0;
+
+ return iter->fn(dev, iter->data);
+}
+
+/**
+ * target_for_each_device - iterate over configured devices
+ * @fn: iterator function
+ * @data: pointer to data that will be passed to fn
+ *
+ * fn must return 0 to continue looping over devices. non-zero will break
+ * from the loop and return that value to the caller.
+ */
+int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
+ void *data)
+{
+ struct devices_idr_iter iter;
+ int ret;
+
+ iter.fn = fn;
+ iter.data = data;
+
+ mutex_lock(&device_mutex);
+ ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
+ mutex_unlock(&device_mutex);
+ return ret;
+}
+
int target_configure_device(struct se_device *dev)
{
struct se_hba *hba = dev->se_hba;
- int ret;
+ int ret, id;
if (dev->dev_flags & DF_CONFIGURED) {
pr_err("se_dev->se_dev_ptr already set for storage"
@@ -886,9 +959,26 @@ int target_configure_device(struct se_device *dev)
return -EEXIST;
}
+ /*
+ * Add early so modules like tcmu can use during its
+ * configuration.
+ */
+ mutex_lock(&device_mutex);
+ /*
+ * Use cyclic to try and avoid collisions with devices
+ * that were recently removed.
+ */
+ id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
+ mutex_unlock(&device_mutex);
+ if (id < 0) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ dev->dev_index = id;
+
ret = dev->transport->configure_device(dev);
if (ret)
- goto out;
+ goto out_free_index;
/*
* XXX: there is not much point to have two different values here..
*/
@@ -903,12 +993,11 @@ int target_configure_device(struct se_device *dev)
dev->dev_attrib.hw_block_size);
dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
- dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
dev->creation_time = get_jiffies_64();
ret = core_setup_alua(dev);
if (ret)
- goto out;
+ goto out_free_index;
/*
* Startup the struct se_device processing thread
@@ -946,16 +1035,16 @@ int target_configure_device(struct se_device *dev)
hba->dev_count++;
spin_unlock(&hba->device_lock);
- mutex_lock(&g_device_mutex);
- list_add_tail(&dev->g_dev_node, &g_device_list);
- mutex_unlock(&g_device_mutex);
-
dev->dev_flags |= DF_CONFIGURED;
return 0;
out_free_alua:
core_alua_free_lu_gp_mem(dev);
+out_free_index:
+ mutex_lock(&device_mutex);
+ idr_remove(&devices_idr, dev->dev_index);
+ mutex_unlock(&device_mutex);
out:
se_release_vpd_for_dev(dev);
return ret;
@@ -970,9 +1059,11 @@ void target_free_device(struct se_device *dev)
if (dev->dev_flags & DF_CONFIGURED) {
destroy_workqueue(dev->tmr_wq);
- mutex_lock(&g_device_mutex);
- list_del(&dev->g_dev_node);
- mutex_unlock(&g_device_mutex);
+ dev->transport->destroy_device(dev);
+
+ mutex_lock(&device_mutex);
+ idr_remove(&devices_idr, dev->dev_index);
+ mutex_unlock(&device_mutex);
spin_lock(&hba->device_lock);
hba->dev_count--;
@@ -1087,19 +1178,19 @@ passthrough_parse_cdb(struct se_cmd *cmd,
TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
if (cdb[0] == PERSISTENT_RESERVE_IN) {
cmd->execute_cmd = target_scsi3_emulate_pr_in;
- size = (cdb[7] << 8) + cdb[8];
+ size = get_unaligned_be16(&cdb[7]);
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];
+ size = get_unaligned_be32(&cdb[5]);
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];
+ size = get_unaligned_be16(&cdb[7]);
else
size = cmd->data_length;
return target_cmd_size_check(cmd, size);
@@ -1107,7 +1198,7 @@ passthrough_parse_cdb(struct se_cmd *cmd,
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];
+ size = get_unaligned_be16(&cdb[7]);
else
size = cmd->data_length;
return target_cmd_size_check(cmd, size);
@@ -1126,7 +1217,7 @@ passthrough_parse_cdb(struct se_cmd *cmd,
case WRITE_16:
case WRITE_VERIFY:
case WRITE_VERIFY_12:
- case 0x8e: /* WRITE_VERIFY_16 */
+ case WRITE_VERIFY_16:
case COMPARE_AND_WRITE:
case XDWRITEREAD_10:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
@@ -1135,7 +1226,7 @@ passthrough_parse_cdb(struct se_cmd *cmd,
switch (get_unaligned_be16(&cdb[8])) {
case READ_32:
case WRITE_32:
- case 0x0c: /* WRITE_VERIFY_32 */
+ case WRITE_VERIFY_32:
case XDWRITEREAD_32:
cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
break;
generated by cgit (git 2.34.1) at 2024-06-10 05:52:58 +0000