From: Mike Christie Date: Mon, 20 Oct 2025 10:38:16 +0000 (+0000) Subject: scsi: target: Add helper to set up atomic values from block_device X-Git-Tag: v6.19-rc1~95^2~33^2~4 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c486634fe2b10301bd8f0319c70a919433bfdf17;p=thirdparty%2Fkernel%2Flinux.git scsi: target: Add helper to set up atomic values from block_device Add 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 jpg: Set atomic alignment, drop atomic_supported reference Signed-off-by: John Garry Link: https://patch.msgid.link/20251020103820.2917593-4-john.g.garry@oracle.com Signed-off-by: Martin K. Petersen --- diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 83fe3d9a9681c..39a2d9c3eb9e1 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -840,6 +840,23 @@ free_device: return NULL; } +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_max_len = queue_atomic_write_max_bytes(q) / block_size; + attrib->atomic_granularity = attrib->atomic_alignment = + 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 d394306f8f490..e32de80854b6a 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) {