Commit ef00f59c authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

block: Add BLKROTATIONAL ioctl 



Introduce an ioctl which permits applications to query whether a block
device is rotational.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b1bd055d

block/compat_ioctl.c

+3 −0
Original line number Diff line number Diff line
@@ -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))

block/ioctl.c

+2 −0
Original line number Diff line number Diff line
@@ -278,6 +278,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 
		return put_uint(arg, bdev_discard_zeroes_data(bdev));

	case BLKSECTGET:

		return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));

	case BLKROTATIONAL:

		return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));

	case BLKRASET:

	case BLKFRASET:

		if(!capable(CAP_SYS_ADMIN))

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -319,6 +319,7 @@ struct inodes_stat_t { 
#define BLKPBSZGET _IO(0x12,123)

#define BLKDISCARDZEROES _IO(0x12,124)

#define BLKSECDISCARD _IO(0x12,125)

#define BLKROTATIONAL _IO(0x12,126)



#define BMAP_IOCTL 1		/* obsolete - kept for compatibility */

#define FIBMAP	   _IO(0x00,1)	/* bmap access */