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authorMartin K. Petersen <martin.petersen@oracle.com>2012-01-11 19:29:31 +0400
committerJens Axboe <axboe@kernel.dk>2012-01-11 19:29:31 +0400
commitef00f59c95fe6e002e7c6e3663cdea65e253f4cc (patch)
tree8e84273162b7a743767098cc08b6c6eb2b041281 /block/compat_ioctl.c
parentb1bd055d397e09f99dcef9b138ed104ff1812fcb (diff)
downloadlinux-ef00f59c95fe6e002e7c6e3663cdea65e253f4cc.tar.xz
block: Add BLKROTATIONAL ioctl
Introduce an ioctl which permits applications to query whether a block device is rotational. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/compat_ioctl.c')
-rw-r--r--block/compat_ioctl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 7b725020823c..7c668c8a6f95 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -719,6 +719,9 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
case BLKSECTGET:
return compat_put_ushort(arg,
queue_max_sectors(bdev_get_queue(bdev)));
+ case BLKROTATIONAL:
+ return compat_put_ushort(arg,
+ !blk_queue_nonrot(bdev_get_queue(bdev)));
case BLKRASET: /* compatible, but no compat_ptr (!) */
case BLKFRASET:
if (!capable(CAP_SYS_ADMIN))