blk-zoned: implement ioctls
Adds the new BLKREPORTZONE and BLKRESETZONE ioctls for respectively
obtaining the zone configuration of a zoned block device and resetting
the write pointer of sequential zones of a zoned block device.
The BLKREPORTZONE ioctl maps directly to a single call of the function
blkdev_report_zones. The zone information result is passed as an array
of struct blk_zone identical to the structure used internally for
processing the REQ_OP_ZONE_REPORT operation. The BLKRESETZONE ioctl
maps to a single call of the blkdev_reset_zones function.
Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 1603573..667f95d 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -255,3 +255,96 @@ int blkdev_reset_zones(struct block_device *bdev,
return 0;
}
EXPORT_SYMBOL_GPL(blkdev_reset_zones);
+
+/**
+ * BLKREPORTZONE ioctl processing.
+ * Called from blkdev_ioctl.
+ */
+int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ struct request_queue *q;
+ struct blk_zone_report rep;
+ struct blk_zone *zones;
+ int ret;
+
+ if (!argp)
+ return -EINVAL;
+
+ q = bdev_get_queue(bdev);
+ if (!q)
+ return -ENXIO;
+
+ if (!blk_queue_is_zoned(q))
+ return -ENOTTY;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
+ return -EFAULT;
+
+ if (!rep.nr_zones)
+ return -EINVAL;
+
+ zones = kcalloc(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL);
+ if (!zones)
+ return -ENOMEM;
+
+ ret = blkdev_report_zones(bdev, rep.sector,
+ zones, &rep.nr_zones,
+ GFP_KERNEL);
+ if (ret)
+ goto out;
+
+ if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (rep.nr_zones) {
+ if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
+ sizeof(struct blk_zone) * rep.nr_zones))
+ ret = -EFAULT;
+ }
+
+ out:
+ kfree(zones);
+
+ return ret;
+}
+
+/**
+ * BLKRESETZONE ioctl processing.
+ * Called from blkdev_ioctl.
+ */
+int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ struct request_queue *q;
+ struct blk_zone_range zrange;
+
+ if (!argp)
+ return -EINVAL;
+
+ q = bdev_get_queue(bdev);
+ if (!q)
+ return -ENXIO;
+
+ if (!blk_queue_is_zoned(q))
+ return -ENOTTY;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
+ return -EFAULT;
+
+ return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
+ GFP_KERNEL);
+}