This adds a helper function that sets up the atomic value based on a
block_device similar to what we do for unmap.
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
drivers/target/target_core_device.c | 18 ++++++++++++++++++
include/target/target_core_backend.h | 2 ++
2 files changed, 20 insertions(+)
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index b709a64c0ff3..4741de3d1061 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -793,6 +793,24 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
return dev;
}
+void target_configure_write_atomic_from_bdev(struct se_dev_attrib *attrib,
+ struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+ int block_size = bdev_logical_block_size(bdev);
+
+ if (!bdev_can_atomic_write(bdev))
+ return;
+
+ attrib->atomic_supported = true;
+ attrib->atomic_max_len = queue_atomic_write_max_bytes(q) / block_size;
+ attrib->atomic_granularity = queue_atomic_write_unit_min_bytes(q) /
+ block_size;
+ attrib->atomic_max_with_boundary = 0;
+ attrib->atomic_max_boundary = 0;
+}
+EXPORT_SYMBOL_GPL(target_configure_write_atomic_from_bdev);
+
/*
* Check if the underlying struct block_device supports discard and if yes
* configure the UNMAP parameters.
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index d394306f8f49..e32de80854b6 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -123,6 +123,8 @@ bool target_sense_desc_format(struct se_device *dev);
sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
bool target_configure_unmap_from_bdev(struct se_dev_attrib *attrib,
struct block_device *bdev);
+void target_configure_write_atomic_from_bdev(struct se_dev_attrib *attrib,
+ struct block_device *bdev);
static inline bool target_dev_configured(struct se_device *se_dev)
{
--
2.34.1
