From 6b206a5a8c2912c3c2174c5afc2f6e798d6ad212 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 28 Jun 2022 15:02:27 -0500 Subject: [PATCH] scsi: target: Add callout to configure UNMAP settings Add a callout to configure a backend's UNMAP settings. This will be used to allow userspace to configure UNMAP after the initial device setup, similar to how we can set up the other attributes post device configuration. Link: https://lore.kernel.org/r/20220628200230.15052-3-michael.christie@oracle.com Reviewed-by: Christoph Hellwig Signed-off-by: Mike Christie Signed-off-by: Martin K. Petersen --- drivers/target/target_core_device.c | 6 ++++++ include/target/target_core_backend.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 25f33eb25337..086ac9c9343c 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -960,6 +960,12 @@ int target_configure_device(struct se_device *dev) ret = dev->transport->configure_device(dev); if (ret) goto out_free_index; + + if (dev->transport->configure_unmap && + dev->transport->configure_unmap(dev)) { + pr_debug("Discard support available, but disabled by default.\n"); + } + /* * XXX: there is not much point to have two different values here.. */ diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index 773963a1e0b5..a3c193df25b3 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -37,6 +37,7 @@ struct target_backend_ops { struct se_dev_plug *(*plug_device)(struct se_device *se_dev); void (*unplug_device)(struct se_dev_plug *se_plug); + bool (*configure_unmap)(struct se_device *se_dev); ssize_t (*set_configfs_dev_params)(struct se_device *, const char *, ssize_t); ssize_t (*show_configfs_dev_params)(struct se_device *, char *);