Implement sd_set_capacity() method which calls into hostt->set_capacity() if implemented. This will be invoked by block layer if partitions extend beyond the end of the device and can be used to implement, for example, on-demand ATA host protected area unlocking. Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- drivers/scsi/sd.c | 26 ++++++++++++++++++++++++++ include/scsi/scsi_host.h | 11 +++++++++++ 2 files changed, 37 insertions(+), 0 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 8b827f3..59d5e8f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -97,6 +97,8 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); #endif static int sd_revalidate_disk(struct gendisk *); +static unsigned long long sd_set_capacity(struct gendisk *disk, + unsigned long long new_capacity); static int sd_probe(struct device *); static int sd_remove(struct device *); static void sd_shutdown(struct device *); @@ -1100,6 +1102,7 @@ static const struct block_device_operations sd_fops = { #endif .media_changed = sd_media_changed, .revalidate_disk = sd_revalidate_disk, + .set_capacity = sd_set_capacity, }; static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) @@ -2101,6 +2104,29 @@ static int sd_revalidate_disk(struct gendisk *disk) } /** + * sd_set_capacity - set disk capacity + * @disk: struct gendisk to set capacity for + * @new_capacity: new target capacity + * + * Block layer calls this function if it detects that partitions + * on @disk reach beyond the end of the device. If the SCSI host + * implements set_capacity method, it's invoked to give it a + * chance to adjust the device capacity. + * + * CONTEXT: + * Defined by block layer. Might sleep. + */ +static unsigned long long sd_set_capacity(struct gendisk *disk, + unsigned long long new_capacity) +{ + struct scsi_device *sdev = scsi_disk(disk)->device; + + if (sdev->host->hostt->set_capacity) + return sdev->host->hostt->set_capacity(sdev, new_capacity); + return 0; +} + +/** * sd_format_disk_name - format disk name * @prefix: name prefix - ie. "sd" for SCSI disks * @index: index of the disk to format name for diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index c50a97f..31dba89 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -327,6 +327,17 @@ struct scsi_host_template { sector_t, int []); /* + * This function is called when one or more partitions on the + * device reach beyond the end of the device. This function + * should return the new capacity if disk was successfully + * enlarged. Return values smaller than the current capacity + * are ignored. + * + * Status: OPTIONAL + */ + sector_t (*set_capacity)(struct scsi_device *, sector_t); + + /* * Can be used to export driver statistics and other infos to the * world outside the kernel ie. userspace and it also provides an * interface to feed the driver with information. -- 1.6.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html