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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
ublk: cleanup ublk_ctrl_uring_cmd
Move all per-command work into the per-command ublk_ctrl_* helpers instead of being split over those, ublk_ctrl_cmd_validate, and the main ublk_ctrl_uring_cmd handler. To facilitate that, the old ublk_ctrl_stop_dev function that just contained two function calls is folded into both callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com> Link: https://lore.kernel.org/r/20220721130916.1869719-6-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
Jens Axboe
parent
fa36204556
commit
34d8f2bea5
1 changed files with 118 additions and 120 deletions
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@ -813,13 +813,6 @@ static void ublk_stop_dev(struct ublk_device *ub)
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cancel_delayed_work_sync(&ub->monitor_work);
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}
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static int ublk_ctrl_stop_dev(struct ublk_device *ub)
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{
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ublk_stop_dev(ub);
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cancel_work_sync(&ub->stop_work);
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return 0;
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}
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static inline bool ublk_queue_ready(struct ublk_queue *ubq)
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{
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return ubq->nr_io_ready == ubq->q_depth;
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@ -1205,8 +1198,8 @@ static int ublk_add_dev(struct ublk_device *ub)
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static void ublk_remove(struct ublk_device *ub)
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{
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ublk_ctrl_stop_dev(ub);
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ublk_stop_dev(ub);
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cancel_work_sync(&ub->stop_work);
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cdev_device_del(&ub->cdev, &ub->cdev_dev);
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put_device(&ub->cdev_dev);
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}
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@ -1227,36 +1220,45 @@ static struct ublk_device *ublk_get_device_from_id(int idx)
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return ub;
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}
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static int ublk_ctrl_start_dev(struct ublk_device *ub, struct io_uring_cmd *cmd)
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static int ublk_ctrl_start_dev(struct io_uring_cmd *cmd)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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int ret = -EINVAL;
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int ublksrv_pid = (int)header->data[0];
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unsigned long dev_blocks = header->data[1];
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struct ublk_device *ub;
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int ret = -EINVAL;
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if (ublksrv_pid <= 0)
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return ret;
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return -EINVAL;
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ub = ublk_get_device_from_id(header->dev_id);
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if (!ub)
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return -EINVAL;
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wait_for_completion_interruptible(&ub->completion);
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schedule_delayed_work(&ub->monitor_work, UBLK_DAEMON_MONITOR_PERIOD);
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mutex_lock(&ub->mutex);
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if (!disk_live(ub->ub_disk)) {
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/* We may get disk size updated */
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if (dev_blocks) {
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ub->dev_info.dev_blocks = dev_blocks;
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ublk_update_capacity(ub);
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}
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ub->dev_info.ublksrv_pid = ublksrv_pid;
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ret = add_disk(ub->ub_disk);
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if (!ret)
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ub->dev_info.state = UBLK_S_DEV_LIVE;
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} else {
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if (disk_live(ub->ub_disk)) {
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ret = -EEXIST;
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goto out_unlock;
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}
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mutex_unlock(&ub->mutex);
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/* We may get disk size updated */
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if (dev_blocks) {
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ub->dev_info.dev_blocks = dev_blocks;
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ublk_update_capacity(ub);
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}
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ub->dev_info.ublksrv_pid = ublksrv_pid;
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ret = add_disk(ub->ub_disk);
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if (ret)
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goto out_unlock;
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ub->dev_info.state = UBLK_S_DEV_LIVE;
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out_unlock:
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mutex_unlock(&ub->mutex);
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ublk_put_device(ub);
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return ret;
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}
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@ -1281,6 +1283,13 @@ static int ublk_ctrl_get_queue_affinity(struct io_uring_cmd *cmd)
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unsigned long queue;
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unsigned int retlen;
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int ret = -EINVAL;
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if (header->len * BITS_PER_BYTE < nr_cpu_ids)
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return -EINVAL;
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if (header->len & (sizeof(unsigned long)-1))
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return -EINVAL;
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if (!header->addr)
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return -EINVAL;
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ub = ublk_get_device_from_id(header->dev_id);
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if (!ub)
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@ -1311,38 +1320,64 @@ static int ublk_ctrl_get_queue_affinity(struct io_uring_cmd *cmd)
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return ret;
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}
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static int ublk_ctrl_add_dev(const struct ublksrv_ctrl_dev_info *info,
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void __user *argp, int idx)
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static inline void ublk_dump_dev_info(struct ublksrv_ctrl_dev_info *info)
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{
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pr_devel("%s: dev id %d flags %llx\n", __func__,
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info->dev_id, info->flags[0]);
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pr_devel("\t nr_hw_queues %d queue_depth %d block size %d dev_capacity %lld\n",
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info->nr_hw_queues, info->queue_depth,
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info->block_size, info->dev_blocks);
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}
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static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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void __user *argp = (void __user *)(unsigned long)header->addr;
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struct ublksrv_ctrl_dev_info info;
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struct ublk_device *ub;
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int ret;
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int ret = -EINVAL;
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if (header->len < sizeof(info) || !header->addr)
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return -EINVAL;
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if (header->queue_id != (u16)-1) {
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pr_warn("%s: queue_id is wrong %x\n",
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__func__, header->queue_id);
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return -EINVAL;
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}
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if (copy_from_user(&info, argp, sizeof(info)))
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return -EFAULT;
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ublk_dump_dev_info(&info);
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if (header->dev_id != info.dev_id) {
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pr_warn("%s: dev id not match %u %u\n",
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__func__, header->dev_id, info.dev_id);
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return -EINVAL;
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}
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ret = mutex_lock_killable(&ublk_ctl_mutex);
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if (ret)
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return ret;
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ub = __ublk_create_dev(idx);
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if (!IS_ERR_OR_NULL(ub)) {
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memcpy(&ub->dev_info, info, sizeof(*info));
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/* update device id */
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ub->dev_info.dev_id = ub->ub_number;
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ret = ublk_add_dev(ub);
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if (!ret) {
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if (copy_to_user(argp, &ub->dev_info, sizeof(*info))) {
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ublk_remove(ub);
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ret = -EFAULT;
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}
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}
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} else {
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if (IS_ERR(ub))
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ret = PTR_ERR(ub);
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else
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ret = -ENOMEM;
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ub = __ublk_create_dev(header->dev_id);
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if (IS_ERR(ub)) {
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ret = PTR_ERR(ub);
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goto out_unlock;
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}
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mutex_unlock(&ublk_ctl_mutex);
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memcpy(&ub->dev_info, &info, sizeof(info));
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/* update device id */
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ub->dev_info.dev_id = ub->ub_number;
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ret = ublk_add_dev(ub);
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if (ret)
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goto out_unlock;
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if (copy_to_user(argp, &ub->dev_info, sizeof(info))) {
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ublk_remove(ub);
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ret = -EFAULT;
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}
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out_unlock:
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mutex_unlock(&ublk_ctl_mutex);
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return ret;
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}
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@ -1386,16 +1421,6 @@ static int ublk_ctrl_del_dev(int idx)
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return ret;
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}
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static inline void ublk_dump_dev_info(struct ublksrv_ctrl_dev_info *info)
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{
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pr_devel("%s: dev id %d flags %llx\n", __func__,
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info->dev_id, info->flags[0]);
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pr_devel("\t nr_hw_queues %d queue_depth %d block size %d dev_capacity %lld\n",
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info->nr_hw_queues, info->queue_depth,
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info->block_size, info->dev_blocks);
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}
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static inline void ublk_ctrl_cmd_dump(struct io_uring_cmd *cmd)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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@ -1405,59 +1430,47 @@ static inline void ublk_ctrl_cmd_dump(struct io_uring_cmd *cmd)
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header->data[0], header->addr, header->len);
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}
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static int ublk_ctrl_cmd_validate(struct io_uring_cmd *cmd,
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struct ublksrv_ctrl_dev_info *info)
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static int ublk_ctrl_stop_dev(struct io_uring_cmd *cmd)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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u32 cmd_op = cmd->cmd_op;
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void __user *argp = (void __user *)(unsigned long)header->addr;
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struct ublk_device *ub;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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ub = ublk_get_device_from_id(header->dev_id);
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if (!ub)
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return -EINVAL;
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switch (cmd_op) {
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case UBLK_CMD_GET_DEV_INFO:
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if (header->len < sizeof(*info) || !header->addr)
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return -EINVAL;
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break;
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case UBLK_CMD_ADD_DEV:
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if (header->len < sizeof(*info) || !header->addr)
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return -EINVAL;
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if (copy_from_user(info, argp, sizeof(*info)) != 0)
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return -EFAULT;
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ublk_dump_dev_info(info);
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if (header->dev_id != info->dev_id) {
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printk(KERN_WARNING "%s: cmd %x, dev id not match %u %u\n",
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__func__, cmd_op, header->dev_id,
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info->dev_id);
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return -EINVAL;
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}
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if (header->queue_id != (u16)-1) {
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printk(KERN_WARNING "%s: cmd %x queue_id is wrong %x\n",
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__func__, cmd_op, header->queue_id);
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return -EINVAL;
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}
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break;
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case UBLK_CMD_GET_QUEUE_AFFINITY:
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if ((header->len * BITS_PER_BYTE) < nr_cpu_ids)
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return -EINVAL;
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if (header->len & (sizeof(unsigned long)-1))
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return -EINVAL;
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if (!header->addr)
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return -EINVAL;
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}
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ublk_stop_dev(ub);
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cancel_work_sync(&ub->stop_work);
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ublk_put_device(ub);
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return 0;
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}
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static int ublk_ctrl_get_dev_info(struct io_uring_cmd *cmd)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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void __user *argp = (void __user *)(unsigned long)header->addr;
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struct ublk_device *ub;
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int ret = 0;
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if (header->len < sizeof(struct ublksrv_ctrl_dev_info) || !header->addr)
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return -EINVAL;
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ub = ublk_get_device_from_id(header->dev_id);
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if (!ub)
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return -EINVAL;
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if (copy_to_user(argp, &ub->dev_info, sizeof(ub->dev_info)))
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ret = -EFAULT;
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ublk_put_device(ub);
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return ret;
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}
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static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
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void __user *argp = (void __user *)(unsigned long)header->addr;
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struct ublksrv_ctrl_dev_info info;
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u32 cmd_op = cmd->cmd_op;
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struct ublk_device *ub;
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int ret = -EINVAL;
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ublk_ctrl_cmd_dump(cmd);
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@ -1465,38 +1478,23 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
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if (!(issue_flags & IO_URING_F_SQE128))
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goto out;
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ret = ublk_ctrl_cmd_validate(cmd, &info);
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if (ret)
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ret = -EPERM;
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if (!capable(CAP_SYS_ADMIN))
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goto out;
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ret = -ENODEV;
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switch (cmd_op) {
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switch (cmd->cmd_op) {
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case UBLK_CMD_START_DEV:
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ub = ublk_get_device_from_id(header->dev_id);
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if (ub) {
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ret = ublk_ctrl_start_dev(ub, cmd);
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ublk_put_device(ub);
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}
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ret = ublk_ctrl_start_dev(cmd);
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break;
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case UBLK_CMD_STOP_DEV:
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ub = ublk_get_device_from_id(header->dev_id);
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if (ub) {
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ret = ublk_ctrl_stop_dev(ub);
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ublk_put_device(ub);
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}
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ret = ublk_ctrl_stop_dev(cmd);
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break;
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case UBLK_CMD_GET_DEV_INFO:
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ub = ublk_get_device_from_id(header->dev_id);
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if (ub) {
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if (copy_to_user(argp, &ub->dev_info, sizeof(info)))
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ret = -EFAULT;
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else
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ret = 0;
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ublk_put_device(ub);
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}
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ret = ublk_ctrl_get_dev_info(cmd);
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break;
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case UBLK_CMD_ADD_DEV:
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ret = ublk_ctrl_add_dev(&info, argp, header->dev_id);
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ret = ublk_ctrl_add_dev(cmd);
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break;
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case UBLK_CMD_DEL_DEV:
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ret = ublk_ctrl_del_dev(header->dev_id);
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