diff options
| -rw-r--r-- | drivers/target/target_core_device.c | 45 | ||||
| -rw-r--r-- | drivers/target/target_core_internal.h | 2 |
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index de1131612ddc..bd32a0c65961 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -904,6 +904,51 @@ struct se_device *target_find_device(int id, bool do_depend) } 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(&g_device_mutex); + ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter); + mutex_unlock(&g_device_mutex); + return ret; +} + int target_configure_device(struct se_device *dev) { struct se_hba *hba = dev->se_hba; diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h index 0912de7c0cf8..1d3ac0238568 100644 --- a/drivers/target/target_core_internal.h +++ b/drivers/target/target_core_internal.h @@ -87,6 +87,8 @@ void core_dev_release_virtual_lun0(void); struct se_device *target_alloc_device(struct se_hba *hba, const char *name); int target_configure_device(struct se_device *dev); void target_free_device(struct se_device *); +int target_for_each_device(int (*fn)(struct se_device *dev, void *data), + void *data); /* target_core_configfs.c */ void target_setup_backend_cits(struct target_backend *); |