From 72ec24bd7725545bc149d80cbd21a7578d9aa206 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sat, 15 May 2010 20:09:32 +0200 Subject: [PATCH] SCSI: implement sd_unlock_native_capacity() Implement sd_unlock_native_capacity() method which calls into hostt->unlock_native_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 Cc: Ben Hutchings Signed-off-by: Jeff Garzik --- drivers/scsi/sd.c | 22 ++++++++++++++++++++++ include/scsi/scsi_host.h | 8 ++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 829cc37abc4..8802e48bc06 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -97,6 +97,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); #endif static int sd_revalidate_disk(struct gendisk *); +static void sd_unlock_native_capacity(struct gendisk *disk); static int sd_probe(struct device *); static int sd_remove(struct device *); static void sd_shutdown(struct device *); @@ -1101,6 +1102,7 @@ static const struct block_device_operations sd_fops = { #endif .media_changed = sd_media_changed, .revalidate_disk = sd_revalidate_disk, + .unlock_native_capacity = sd_unlock_native_capacity, }; static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) @@ -2120,6 +2122,26 @@ static int sd_revalidate_disk(struct gendisk *disk) return 0; } +/** + * sd_unlock_native_capacity - unlock native capacity + * @disk: struct gendisk to set capacity for + * + * Block layer calls this function if it detects that partitions + * on @disk reach beyond the end of the device. If the SCSI host + * implements ->unlock_native_capacity() method, it's invoked to + * give it a chance to adjust the device capacity. + * + * CONTEXT: + * Defined by block layer. Might sleep. + */ +static void sd_unlock_native_capacity(struct gendisk *disk) +{ + struct scsi_device *sdev = scsi_disk(disk)->device; + + if (sdev->host->hostt->unlock_native_capacity) + sdev->host->hostt->unlock_native_capacity(sdev); +} + /** * sd_format_disk_name - format disk name * @prefix: name prefix - ie. "sd" for SCSI disks diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index c50a97fc76f..b7bdecb7b76 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -326,6 +326,14 @@ struct scsi_host_template { int (* bios_param)(struct scsi_device *, struct block_device *, sector_t, int []); + /* + * This function is called when one or more partitions on the + * device reach beyond the end of the device. + * + * Status: OPTIONAL + */ + void (*unlock_native_capacity)(struct scsi_device *); + /* * Can be used to export driver statistics and other infos to the * world outside the kernel ie. userspace and it also provides an -- 2.39.2