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From: Tejun Heo on 13 May 2010 12:00
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(a)kernel.org>
Cc: Ben Hutchings <ben(a)decadent.org.uk>
---
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

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Prev: vfs: Fix O_NOFOLLOW behavior for paths with trailing slashes
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