The next patch is going to fix the hung nl command issue
so this adds a list of outstanding nl commands that we
can later abort when the daemon is restarted.
Signed-off-by: Mike Christie <mchristi@xxxxxxxxxx>
---
drivers/target/target_core_user.c | 68 ++++++++++++++++++++++-----------------
1 file changed, 39 insertions(+), 29 deletions(-)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 898a561..73a5768 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -103,9 +103,16 @@ struct tcmu_hba {
#define TCMU_CONFIG_LEN 256
+static DEFINE_MUTEX(tcmu_nl_cmd_mutex);
+static LIST_HEAD(tcmu_nl_cmd_list);
+
+struct tcmu_dev;
+
struct tcmu_nl_cmd {
/* wake up thread waiting for reply */
struct completion complete;
+ struct list_head nl_list;
+ struct tcmu_dev *udev;
int cmd;
int status;
};
@@ -157,7 +164,6 @@ struct tcmu_dev {
struct list_head timedout_entry;
- spinlock_t nl_cmd_lock;
struct tcmu_nl_cmd curr_nl_cmd;
/* wake up threads waiting on curr_nl_cmd */
wait_queue_head_t nl_cmd_wq;
@@ -270,11 +276,9 @@ static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = {
static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd)
{
- struct se_device *dev;
- struct tcmu_dev *udev;
+ struct tcmu_dev *udev = NULL;
struct tcmu_nl_cmd *nl_cmd;
int dev_id, rc, ret = 0;
- bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE);
if (!info->attrs[TCMU_ATTR_CMD_STATUS] ||
!info->attrs[TCMU_ATTR_DEVICE_ID]) {
@@ -285,33 +289,36 @@ static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd)
dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]);
rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]);
- dev = target_find_device(dev_id, !is_removed);
- if (!dev) {
- printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n",
- completed_cmd, rc, dev_id);
- return -ENODEV;
+ mutex_lock(&tcmu_nl_cmd_mutex);
+ list_for_each_entry(nl_cmd, &tcmu_nl_cmd_list, nl_list) {
+ if (nl_cmd->udev->se_dev.dev_index == dev_id) {
+ udev = nl_cmd->udev;
+ break;
+ }
}
- udev = TCMU_DEV(dev);
- spin_lock(&udev->nl_cmd_lock);
- nl_cmd = &udev->curr_nl_cmd;
+ if (!udev) {
+ pr_err(KERN_ERR "tcmu nl cmd %u/%d completion could not find device with dev id %u.\n",
+ completed_cmd, rc, dev_id);
+ ret = -ENODEV;
+ goto unlock;
+ }
+ list_del(&nl_cmd->nl_list);
- pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id,
- nl_cmd->cmd, completed_cmd, rc);
+ pr_debug("%s genl cmd done got id %d curr %d done %d rc %d\n",
+ udev->name, dev_id, nl_cmd->cmd, completed_cmd, rc);
if (nl_cmd->cmd != completed_cmd) {
- printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n",
- completed_cmd, nl_cmd->cmd);
+ pr_err("Mismatched commands on %s (Expecting reply for %d. Current %d).\n",
+ udev->name, completed_cmd, nl_cmd->cmd);
ret = -EINVAL;
- } else {
- nl_cmd->status = rc;
+ goto unlock;
}
- spin_unlock(&udev->nl_cmd_lock);
- if (!is_removed)
- target_undepend_item(&dev->dev_group.cg_item);
- if (!ret)
- complete(&nl_cmd->complete);
+ nl_cmd->status = rc;
+ complete(&nl_cmd->complete);
+unlock:
+ mutex_unlock(&tcmu_nl_cmd_mutex);
return ret;
}
@@ -1258,7 +1265,6 @@ static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name)
timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0);
init_waitqueue_head(&udev->nl_cmd_wq);
- spin_lock_init(&udev->nl_cmd_lock);
INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL);
@@ -1544,10 +1550,10 @@ static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd)
return;
relock:
- spin_lock(&udev->nl_cmd_lock);
+ mutex_lock(&tcmu_nl_cmd_mutex);
if (nl_cmd->cmd != TCMU_CMD_UNSPEC) {
- spin_unlock(&udev->nl_cmd_lock);
+ mutex_unlock(&tcmu_nl_cmd_mutex);
pr_debug("sleeping for open nl cmd\n");
wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC));
goto relock;
@@ -1555,9 +1561,13 @@ static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd)
memset(nl_cmd, 0, sizeof(*nl_cmd));
nl_cmd->cmd = cmd;
+ nl_cmd->udev = udev;
init_completion(&nl_cmd->complete);
+ INIT_LIST_HEAD(&nl_cmd->nl_list);
+
+ list_add_tail(&nl_cmd->nl_list, &tcmu_nl_cmd_list);
- spin_unlock(&udev->nl_cmd_lock);
+ mutex_unlock(&tcmu_nl_cmd_mutex);
}
static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev)
@@ -1574,11 +1584,11 @@ static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev)
pr_debug("sleeping for nl reply\n");
wait_for_completion(&nl_cmd->complete);
- spin_lock(&udev->nl_cmd_lock);
+ mutex_lock(&tcmu_nl_cmd_mutex);
nl_cmd->cmd = TCMU_CMD_UNSPEC;
ret = nl_cmd->status;
nl_cmd->status = 0;
- spin_unlock(&udev->nl_cmd_lock);
+ mutex_unlock(&tcmu_nl_cmd_mutex);
wake_up_all(&udev->nl_cmd_wq);
--
2.7.2
