From 89d9475610771b5e5fe1879075f0fc9ba6e3755f Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Tue, 18 Oct 2016 15:40:34 +0900 Subject: sd: Implement support for ZBC devices Implement ZBC support functions to setup zoned disks, both host-managed and host-aware models. Only zoned disks that satisfy the following conditions are supported: 1) All zones are the same size, with the exception of an eventual last smaller runt zone. 2) For host-managed disks, reads are unrestricted (reads are not failed due to zone or write pointer alignement constraints). Zoned disks that do not satisfy these 2 conditions are setup with a capacity of 0 to prevent their use. The function sd_zbc_read_zones, called from sd_revalidate_disk, checks that the device satisfies the above two constraints. This function may also change the disk capacity previously set by sd_read_capacity for devices reporting only the capacity of conventional zones at the beginning of the LBA range (i.e. devices reporting rc_basis set to 0). The capacity message output was moved out of sd_read_capacity into a new function sd_print_capacity to include this eventual capacity change by sd_zbc_read_zones. This new function also includes a call to sd_zbc_print_zones to display the number of zones and zone size of the device. Signed-off-by: Hannes Reinecke [Damien: * Removed zone cache support * Removed mapping of discard to reset write pointer command * Modified sd_zbc_read_zones to include checks that the device satisfies the kernel constraints * Implemeted REPORT ZONES setup and post-processing based on code from Shaun Tancheff * Removed confusing use of 512B sector units in functions interface] Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Shaun Tancheff Tested-by: Shaun Tancheff Acked-by: Martin K. Petersen Signed-off-by: Jens Axboe --- drivers/scsi/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/scsi/Makefile') diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 38d938d7fe67..1520596f54a6 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -173,6 +173,7 @@ hv_storvsc-y := storvsc_drv.o sd_mod-objs := sd.o sd_mod-$(CONFIG_BLK_DEV_INTEGRITY) += sd_dif.o +sd_mod-$(CONFIG_BLK_DEV_ZONED) += sd_zbc.o sr_mod-objs := sr.o sr_ioctl.o sr_vendor.o ncr53c8xx-flags-$(CONFIG_SCSI_ZALON) \ -- cgit v1.2.3